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Paul Bakker5121ce52009-01-03 21:22:43 +00001/*
2 * SSLv3/TLSv1 shared functions
3 *
Manuel Pégourié-Gonnard6fb81872015-07-27 11:11:48 +02004 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Manuel Pégourié-Gonnard37ff1402015-09-04 14:21:07 +02005 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
Paul Bakkerb96f1542010-07-18 20:36:00 +000018 *
Manuel Pégourié-Gonnardfe446432015-03-06 13:17:10 +000019 * This file is part of mbed TLS (https://tls.mbed.org)
Paul Bakker5121ce52009-01-03 21:22:43 +000020 */
21/*
22 * The SSL 3.0 specification was drafted by Netscape in 1996,
23 * and became an IETF standard in 1999.
24 *
25 * http://wp.netscape.com/eng/ssl3/
26 * http://www.ietf.org/rfc/rfc2246.txt
27 * http://www.ietf.org/rfc/rfc4346.txt
28 */
29
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020030#if !defined(MBEDTLS_CONFIG_FILE)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000031#include "mbedtls/config.h"
Manuel Pégourié-Gonnardcef4ad22014-04-29 12:39:06 +020032#else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020033#include MBEDTLS_CONFIG_FILE
Manuel Pégourié-Gonnardcef4ad22014-04-29 12:39:06 +020034#endif
Paul Bakker5121ce52009-01-03 21:22:43 +000035
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020036#if defined(MBEDTLS_SSL_TLS_C)
Paul Bakker5121ce52009-01-03 21:22:43 +000037
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000038#include "mbedtls/debug.h"
39#include "mbedtls/ssl.h"
Manuel Pégourié-Gonnard5e94dde2015-05-26 11:57:05 +020040#include "mbedtls/ssl_internal.h"
Paul Bakker0be444a2013-08-27 21:55:01 +020041
Rich Evans00ab4702015-02-06 13:43:58 +000042#include <string.h>
43
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020044#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
45 defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000046#include "mbedtls/oid.h"
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +020047#endif
48
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020049#if defined(MBEDTLS_PLATFORM_C)
Manuel Pégourié-Gonnard7f809972015-03-09 17:05:11 +000050#include "mbedtls/platform.h"
Paul Bakker6e339b52013-07-03 13:37:05 +020051#else
Rich Evans00ab4702015-02-06 13:43:58 +000052#include <stdlib.h>
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +020053#define mbedtls_calloc calloc
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020054#define mbedtls_free free
Paul Bakker6e339b52013-07-03 13:37:05 +020055#endif
56
Paul Bakker34617722014-06-13 17:20:13 +020057/* Implementation that should never be optimized out by the compiler */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020058static void mbedtls_zeroize( void *v, size_t n ) {
Paul Bakker34617722014-06-13 17:20:13 +020059 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
60}
61
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +010062/* Length of the "epoch" field in the record header */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020063static inline size_t ssl_ep_len( const mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +010064{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020065#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +020066 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +010067 return( 2 );
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +010068#else
69 ((void) ssl);
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +010070#endif
71 return( 0 );
72}
73
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020074/*
75 * Start a timer.
76 * Passing millisecs = 0 cancels a running timer.
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020077 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020078static void ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs )
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020079{
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +020080 if( ssl->f_set_timer == NULL )
81 return;
82
83 MBEDTLS_SSL_DEBUG_MSG( 3, ( "set_timer to %d ms", (int) millisecs ) );
84 ssl->f_set_timer( ssl->p_timer, millisecs / 4, millisecs );
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020085}
86
87/*
88 * Return -1 is timer is expired, 0 if it isn't.
89 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +020090static int ssl_check_timer( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020091{
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +020092 if( ssl->f_get_timer == NULL )
Manuel Pégourié-Gonnard545102e2015-05-13 17:28:43 +020093 return( 0 );
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +020094
95 if( ssl->f_get_timer( ssl->p_timer ) == 2 )
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +020096 {
97 MBEDTLS_SSL_DEBUG_MSG( 3, ( "timer expired" ) );
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +020098 return( -1 );
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +020099 }
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +0200100
101 return( 0 );
102}
Manuel Pégourié-Gonnarddb2858c2014-09-29 14:04:42 +0200103
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +0200104#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200105/*
106 * Double the retransmit timeout value, within the allowed range,
107 * returning -1 if the maximum value has already been reached.
108 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200109static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200110{
111 uint32_t new_timeout;
112
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200113 if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max )
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200114 return( -1 );
115
116 new_timeout = 2 * ssl->handshake->retransmit_timeout;
117
118 /* Avoid arithmetic overflow and range overflow */
119 if( new_timeout < ssl->handshake->retransmit_timeout ||
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200120 new_timeout > ssl->conf->hs_timeout_max )
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200121 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200122 new_timeout = ssl->conf->hs_timeout_max;
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200123 }
124
125 ssl->handshake->retransmit_timeout = new_timeout;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200126 MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200127 ssl->handshake->retransmit_timeout ) );
128
129 return( 0 );
130}
131
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200132static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200133{
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200134 ssl->handshake->retransmit_timeout = ssl->conf->hs_timeout_min;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200135 MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200136 ssl->handshake->retransmit_timeout ) );
137}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200138#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +0200139
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200140#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
Manuel Pégourié-Gonnard581e6b62013-07-18 12:32:27 +0200141/*
142 * Convert max_fragment_length codes to length.
143 * RFC 6066 says:
144 * enum{
145 * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255)
146 * } MaxFragmentLength;
147 * and we add 0 -> extension unused
148 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200149static unsigned int mfl_code_to_length[MBEDTLS_SSL_MAX_FRAG_LEN_INVALID] =
Manuel Pégourié-Gonnard581e6b62013-07-18 12:32:27 +0200150{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200151 MBEDTLS_SSL_MAX_CONTENT_LEN, /* MBEDTLS_SSL_MAX_FRAG_LEN_NONE */
152 512, /* MBEDTLS_SSL_MAX_FRAG_LEN_512 */
153 1024, /* MBEDTLS_SSL_MAX_FRAG_LEN_1024 */
154 2048, /* MBEDTLS_SSL_MAX_FRAG_LEN_2048 */
155 4096, /* MBEDTLS_SSL_MAX_FRAG_LEN_4096 */
Manuel Pégourié-Gonnard581e6b62013-07-18 12:32:27 +0200156};
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200157#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
Manuel Pégourié-Gonnard581e6b62013-07-18 12:32:27 +0200158
Manuel Pégourié-Gonnardcf141ca2015-05-20 10:35:51 +0200159#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200160static int ssl_session_copy( mbedtls_ssl_session *dst, const mbedtls_ssl_session *src )
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200161{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200162 mbedtls_ssl_session_free( dst );
163 memcpy( dst, src, sizeof( mbedtls_ssl_session ) );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200164
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200165#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200166 if( src->peer_cert != NULL )
167 {
Paul Bakker2292d1f2013-09-15 17:06:49 +0200168 int ret;
169
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +0200170 dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) );
Paul Bakkerb9cfaa02013-10-11 18:58:55 +0200171 if( dst->peer_cert == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +0200172 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200173
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200174 mbedtls_x509_crt_init( dst->peer_cert );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200175
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200176 if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p,
Manuel Pégourié-Gonnard4d2a8eb2014-06-13 20:33:27 +0200177 src->peer_cert->raw.len ) ) != 0 )
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200178 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200179 mbedtls_free( dst->peer_cert );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200180 dst->peer_cert = NULL;
181 return( ret );
182 }
183 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200184#endif /* MBEDTLS_X509_CRT_PARSE_C */
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200185
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +0200186#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200187 if( src->ticket != NULL )
188 {
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +0200189 dst->ticket = mbedtls_calloc( 1, src->ticket_len );
Paul Bakkerb9cfaa02013-10-11 18:58:55 +0200190 if( dst->ticket == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +0200191 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200192
193 memcpy( dst->ticket, src->ticket, src->ticket_len );
194 }
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +0200195#endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200196
197 return( 0 );
198}
Manuel Pégourié-Gonnardcf141ca2015-05-20 10:35:51 +0200199#endif /* MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +0200200
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200201#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
202int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl,
Paul Bakker9af723c2014-05-01 13:03:14 +0200203 const unsigned char *key_enc, const unsigned char *key_dec,
204 size_t keylen,
205 const unsigned char *iv_enc, const unsigned char *iv_dec,
206 size_t ivlen,
207 const unsigned char *mac_enc, const unsigned char *mac_dec,
Paul Bakker66d5d072014-06-17 16:39:18 +0200208 size_t maclen ) = NULL;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200209int (*mbedtls_ssl_hw_record_activate)( mbedtls_ssl_context *ssl, int direction) = NULL;
210int (*mbedtls_ssl_hw_record_reset)( mbedtls_ssl_context *ssl ) = NULL;
211int (*mbedtls_ssl_hw_record_write)( mbedtls_ssl_context *ssl ) = NULL;
212int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL;
213int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL;
214#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
Paul Bakker05ef8352012-05-08 09:17:57 +0000215
Paul Bakker5121ce52009-01-03 21:22:43 +0000216/*
217 * Key material generation
218 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200219#if defined(MBEDTLS_SSL_PROTO_SSL3)
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +0200220static int ssl3_prf( const unsigned char *secret, size_t slen,
221 const char *label,
222 const unsigned char *random, size_t rlen,
Paul Bakker5f70b252012-09-13 14:23:06 +0000223 unsigned char *dstbuf, size_t dlen )
224{
225 size_t i;
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200226 mbedtls_md5_context md5;
227 mbedtls_sha1_context sha1;
Paul Bakker5f70b252012-09-13 14:23:06 +0000228 unsigned char padding[16];
229 unsigned char sha1sum[20];
230 ((void)label);
231
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200232 mbedtls_md5_init( &md5 );
233 mbedtls_sha1_init( &sha1 );
Paul Bakker5b4af392014-06-26 12:09:34 +0200234
Paul Bakker5f70b252012-09-13 14:23:06 +0000235 /*
236 * SSLv3:
237 * block =
238 * MD5( secret + SHA1( 'A' + secret + random ) ) +
239 * MD5( secret + SHA1( 'BB' + secret + random ) ) +
240 * MD5( secret + SHA1( 'CCC' + secret + random ) ) +
241 * ...
242 */
243 for( i = 0; i < dlen / 16; i++ )
244 {
Paul Bakkerb9cfaa02013-10-11 18:58:55 +0200245 memset( padding, (unsigned char) ('A' + i), 1 + i );
Paul Bakker5f70b252012-09-13 14:23:06 +0000246
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200247 mbedtls_sha1_starts( &sha1 );
248 mbedtls_sha1_update( &sha1, padding, 1 + i );
249 mbedtls_sha1_update( &sha1, secret, slen );
250 mbedtls_sha1_update( &sha1, random, rlen );
251 mbedtls_sha1_finish( &sha1, sha1sum );
Paul Bakker5f70b252012-09-13 14:23:06 +0000252
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200253 mbedtls_md5_starts( &md5 );
254 mbedtls_md5_update( &md5, secret, slen );
255 mbedtls_md5_update( &md5, sha1sum, 20 );
256 mbedtls_md5_finish( &md5, dstbuf + i * 16 );
Paul Bakker5f70b252012-09-13 14:23:06 +0000257 }
258
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200259 mbedtls_md5_free( &md5 );
260 mbedtls_sha1_free( &sha1 );
Paul Bakker5f70b252012-09-13 14:23:06 +0000261
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200262 mbedtls_zeroize( padding, sizeof( padding ) );
263 mbedtls_zeroize( sha1sum, sizeof( sha1sum ) );
Paul Bakker5f70b252012-09-13 14:23:06 +0000264
265 return( 0 );
266}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200267#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker5f70b252012-09-13 14:23:06 +0000268
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200269#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +0200270static int tls1_prf( const unsigned char *secret, size_t slen,
271 const char *label,
272 const unsigned char *random, size_t rlen,
Paul Bakker23986e52011-04-24 08:57:21 +0000273 unsigned char *dstbuf, size_t dlen )
Paul Bakker5121ce52009-01-03 21:22:43 +0000274{
Paul Bakker23986e52011-04-24 08:57:21 +0000275 size_t nb, hs;
276 size_t i, j, k;
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +0200277 const unsigned char *S1, *S2;
Paul Bakker5121ce52009-01-03 21:22:43 +0000278 unsigned char tmp[128];
279 unsigned char h_i[20];
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200280 const mbedtls_md_info_t *md_info;
281 mbedtls_md_context_t md_ctx;
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100282 int ret;
283
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200284 mbedtls_md_init( &md_ctx );
Paul Bakker5121ce52009-01-03 21:22:43 +0000285
286 if( sizeof( tmp ) < 20 + strlen( label ) + rlen )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200287 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker5121ce52009-01-03 21:22:43 +0000288
289 hs = ( slen + 1 ) / 2;
290 S1 = secret;
291 S2 = secret + slen - hs;
292
293 nb = strlen( label );
294 memcpy( tmp + 20, label, nb );
295 memcpy( tmp + 20 + nb, random, rlen );
296 nb += rlen;
297
298 /*
299 * First compute P_md5(secret,label+random)[0..dlen]
300 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200301 if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL )
302 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard7da726b2015-03-24 18:08:19 +0100303
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200304 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100305 return( ret );
306
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200307 mbedtls_md_hmac_starts( &md_ctx, S1, hs );
308 mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
309 mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
Paul Bakker5121ce52009-01-03 21:22:43 +0000310
311 for( i = 0; i < dlen; i += 16 )
312 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200313 mbedtls_md_hmac_reset ( &md_ctx );
314 mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb );
315 mbedtls_md_hmac_finish( &md_ctx, h_i );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100316
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200317 mbedtls_md_hmac_reset ( &md_ctx );
318 mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 );
319 mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
Paul Bakker5121ce52009-01-03 21:22:43 +0000320
321 k = ( i + 16 > dlen ) ? dlen % 16 : 16;
322
323 for( j = 0; j < k; j++ )
324 dstbuf[i + j] = h_i[j];
325 }
326
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200327 mbedtls_md_free( &md_ctx );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100328
Paul Bakker5121ce52009-01-03 21:22:43 +0000329 /*
330 * XOR out with P_sha1(secret,label+random)[0..dlen]
331 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200332 if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL )
333 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard7da726b2015-03-24 18:08:19 +0100334
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200335 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100336 return( ret );
337
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200338 mbedtls_md_hmac_starts( &md_ctx, S2, hs );
339 mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
340 mbedtls_md_hmac_finish( &md_ctx, tmp );
Paul Bakker5121ce52009-01-03 21:22:43 +0000341
342 for( i = 0; i < dlen; i += 20 )
343 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200344 mbedtls_md_hmac_reset ( &md_ctx );
345 mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb );
346 mbedtls_md_hmac_finish( &md_ctx, h_i );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100347
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200348 mbedtls_md_hmac_reset ( &md_ctx );
349 mbedtls_md_hmac_update( &md_ctx, tmp, 20 );
350 mbedtls_md_hmac_finish( &md_ctx, tmp );
Paul Bakker5121ce52009-01-03 21:22:43 +0000351
352 k = ( i + 20 > dlen ) ? dlen % 20 : 20;
353
354 for( j = 0; j < k; j++ )
355 dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] );
356 }
357
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200358 mbedtls_md_free( &md_ctx );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100359
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200360 mbedtls_zeroize( tmp, sizeof( tmp ) );
361 mbedtls_zeroize( h_i, sizeof( h_i ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000362
363 return( 0 );
364}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200365#endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */
Paul Bakker5121ce52009-01-03 21:22:43 +0000366
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200367#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
368static int tls_prf_generic( mbedtls_md_type_t md_type,
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100369 const unsigned char *secret, size_t slen,
370 const char *label,
371 const unsigned char *random, size_t rlen,
372 unsigned char *dstbuf, size_t dlen )
Paul Bakker1ef83d62012-04-11 12:09:53 +0000373{
374 size_t nb;
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100375 size_t i, j, k, md_len;
Paul Bakker1ef83d62012-04-11 12:09:53 +0000376 unsigned char tmp[128];
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200377 unsigned char h_i[MBEDTLS_MD_MAX_SIZE];
378 const mbedtls_md_info_t *md_info;
379 mbedtls_md_context_t md_ctx;
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100380 int ret;
381
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200382 mbedtls_md_init( &md_ctx );
Paul Bakker1ef83d62012-04-11 12:09:53 +0000383
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200384 if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL )
385 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100386
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200387 md_len = mbedtls_md_get_size( md_info );
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100388
389 if( sizeof( tmp ) < md_len + strlen( label ) + rlen )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200390 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker1ef83d62012-04-11 12:09:53 +0000391
392 nb = strlen( label );
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100393 memcpy( tmp + md_len, label, nb );
394 memcpy( tmp + md_len + nb, random, rlen );
Paul Bakker1ef83d62012-04-11 12:09:53 +0000395 nb += rlen;
396
397 /*
398 * Compute P_<hash>(secret, label + random)[0..dlen]
399 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200400 if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100401 return( ret );
402
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200403 mbedtls_md_hmac_starts( &md_ctx, secret, slen );
404 mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb );
405 mbedtls_md_hmac_finish( &md_ctx, tmp );
Manuel Pégourié-Gonnard7da726b2015-03-24 18:08:19 +0100406
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100407 for( i = 0; i < dlen; i += md_len )
Paul Bakker1ef83d62012-04-11 12:09:53 +0000408 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200409 mbedtls_md_hmac_reset ( &md_ctx );
410 mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb );
411 mbedtls_md_hmac_finish( &md_ctx, h_i );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100412
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200413 mbedtls_md_hmac_reset ( &md_ctx );
414 mbedtls_md_hmac_update( &md_ctx, tmp, md_len );
415 mbedtls_md_hmac_finish( &md_ctx, tmp );
Paul Bakker1ef83d62012-04-11 12:09:53 +0000416
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100417 k = ( i + md_len > dlen ) ? dlen % md_len : md_len;
Paul Bakker1ef83d62012-04-11 12:09:53 +0000418
419 for( j = 0; j < k; j++ )
420 dstbuf[i + j] = h_i[j];
421 }
422
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200423 mbedtls_md_free( &md_ctx );
Manuel Pégourié-Gonnardb7fcca32015-03-26 11:41:28 +0100424
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200425 mbedtls_zeroize( tmp, sizeof( tmp ) );
426 mbedtls_zeroize( h_i, sizeof( h_i ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +0000427
428 return( 0 );
429}
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100430
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200431#if defined(MBEDTLS_SHA256_C)
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100432static int tls_prf_sha256( const unsigned char *secret, size_t slen,
433 const char *label,
434 const unsigned char *random, size_t rlen,
435 unsigned char *dstbuf, size_t dlen )
436{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200437 return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen,
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100438 label, random, rlen, dstbuf, dlen ) );
439}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200440#endif /* MBEDTLS_SHA256_C */
Paul Bakker1ef83d62012-04-11 12:09:53 +0000441
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200442#if defined(MBEDTLS_SHA512_C)
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +0200443static int tls_prf_sha384( const unsigned char *secret, size_t slen,
444 const char *label,
445 const unsigned char *random, size_t rlen,
Paul Bakkerca4ab492012-04-18 14:23:57 +0000446 unsigned char *dstbuf, size_t dlen )
447{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200448 return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen,
Manuel Pégourié-Gonnard6890c6b2015-03-26 11:11:49 +0100449 label, random, rlen, dstbuf, dlen ) );
Paul Bakkerca4ab492012-04-18 14:23:57 +0000450}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200451#endif /* MBEDTLS_SHA512_C */
452#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakkerca4ab492012-04-18 14:23:57 +0000453
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200454static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t );
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200455
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200456#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
457 defined(MBEDTLS_SSL_PROTO_TLS1_1)
458static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t );
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200459#endif
Paul Bakker380da532012-04-18 16:10:25 +0000460
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200461#if defined(MBEDTLS_SSL_PROTO_SSL3)
462static void ssl_calc_verify_ssl( mbedtls_ssl_context *, unsigned char * );
463static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int );
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200464#endif
465
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200466#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
467static void ssl_calc_verify_tls( mbedtls_ssl_context *, unsigned char * );
468static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int );
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200469#endif
470
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200471#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
472#if defined(MBEDTLS_SHA256_C)
473static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t );
474static void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *,unsigned char * );
475static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int );
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200476#endif
Paul Bakker769075d2012-11-24 11:26:46 +0100477
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200478#if defined(MBEDTLS_SHA512_C)
479static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t );
480static void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *, unsigned char * );
481static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int );
Paul Bakker769075d2012-11-24 11:26:46 +0100482#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200483#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker1ef83d62012-04-11 12:09:53 +0000484
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200485int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +0000486{
Paul Bakkerda02a7f2013-08-31 17:25:14 +0200487 int ret = 0;
Paul Bakker5121ce52009-01-03 21:22:43 +0000488 unsigned char tmp[64];
Paul Bakker5121ce52009-01-03 21:22:43 +0000489 unsigned char keyblk[256];
490 unsigned char *key1;
491 unsigned char *key2;
Paul Bakker68884e32013-01-07 18:20:04 +0100492 unsigned char *mac_enc;
493 unsigned char *mac_dec;
Hanno Becker64f0aed2017-11-09 18:39:33 +0000494 size_t mac_key_len;
Paul Bakkerb9cfaa02013-10-11 18:58:55 +0200495 size_t iv_copy_len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200496 const mbedtls_cipher_info_t *cipher_info;
497 const mbedtls_md_info_t *md_info;
Paul Bakker68884e32013-01-07 18:20:04 +0100498
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200499 mbedtls_ssl_session *session = ssl->session_negotiate;
500 mbedtls_ssl_transform *transform = ssl->transform_negotiate;
501 mbedtls_ssl_handshake_params *handshake = ssl->handshake;
Paul Bakker5121ce52009-01-03 21:22:43 +0000502
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200503 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000504
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200505 cipher_info = mbedtls_cipher_info_from_type( transform->ciphersuite_info->cipher );
Paul Bakker68884e32013-01-07 18:20:04 +0100506 if( cipher_info == NULL )
507 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200508 MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %d not found",
Paul Bakker68884e32013-01-07 18:20:04 +0100509 transform->ciphersuite_info->cipher ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200510 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker68884e32013-01-07 18:20:04 +0100511 }
512
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200513 md_info = mbedtls_md_info_from_type( transform->ciphersuite_info->mac );
Paul Bakker68884e32013-01-07 18:20:04 +0100514 if( md_info == NULL )
515 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200516 MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %d not found",
Paul Bakker68884e32013-01-07 18:20:04 +0100517 transform->ciphersuite_info->mac ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200518 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker68884e32013-01-07 18:20:04 +0100519 }
520
Paul Bakker5121ce52009-01-03 21:22:43 +0000521 /*
Paul Bakkerca4ab492012-04-18 14:23:57 +0000522 * Set appropriate PRF function and other SSL / TLS / TLS1.2 functions
Paul Bakker1ef83d62012-04-11 12:09:53 +0000523 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200524#if defined(MBEDTLS_SSL_PROTO_SSL3)
525 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakkerca4ab492012-04-18 14:23:57 +0000526 {
Paul Bakker48916f92012-09-16 19:57:18 +0000527 handshake->tls_prf = ssl3_prf;
528 handshake->calc_verify = ssl_calc_verify_ssl;
529 handshake->calc_finished = ssl_calc_finished_ssl;
Paul Bakkerca4ab492012-04-18 14:23:57 +0000530 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200531 else
532#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200533#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
534 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
Paul Bakkerca4ab492012-04-18 14:23:57 +0000535 {
Paul Bakker48916f92012-09-16 19:57:18 +0000536 handshake->tls_prf = tls1_prf;
537 handshake->calc_verify = ssl_calc_verify_tls;
538 handshake->calc_finished = ssl_calc_finished_tls;
Paul Bakkerca4ab492012-04-18 14:23:57 +0000539 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200540 else
541#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200542#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
543#if defined(MBEDTLS_SHA512_C)
544 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
545 transform->ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
Paul Bakkerca4ab492012-04-18 14:23:57 +0000546 {
Paul Bakker48916f92012-09-16 19:57:18 +0000547 handshake->tls_prf = tls_prf_sha384;
548 handshake->calc_verify = ssl_calc_verify_tls_sha384;
549 handshake->calc_finished = ssl_calc_finished_tls_sha384;
Paul Bakkerca4ab492012-04-18 14:23:57 +0000550 }
Paul Bakker1ef83d62012-04-11 12:09:53 +0000551 else
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200552#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200553#if defined(MBEDTLS_SHA256_C)
554 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
Paul Bakkerca4ab492012-04-18 14:23:57 +0000555 {
Paul Bakker48916f92012-09-16 19:57:18 +0000556 handshake->tls_prf = tls_prf_sha256;
557 handshake->calc_verify = ssl_calc_verify_tls_sha256;
558 handshake->calc_finished = ssl_calc_finished_tls_sha256;
Paul Bakkerca4ab492012-04-18 14:23:57 +0000559 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200560 else
561#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200562#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker577e0062013-08-28 11:57:20 +0200563 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200564 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
565 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker577e0062013-08-28 11:57:20 +0200566 }
Paul Bakker1ef83d62012-04-11 12:09:53 +0000567
568 /*
Paul Bakker5121ce52009-01-03 21:22:43 +0000569 * SSLv3:
570 * master =
571 * MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) +
572 * MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) +
573 * MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) )
Paul Bakkerf7abd422013-04-16 13:15:56 +0200574 *
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200575 * TLSv1+:
Paul Bakker5121ce52009-01-03 21:22:43 +0000576 * master = PRF( premaster, "master secret", randbytes )[0..47]
577 */
Paul Bakker0a597072012-09-25 21:55:46 +0000578 if( handshake->resume == 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000579 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200580 MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster,
Paul Bakker48916f92012-09-16 19:57:18 +0000581 handshake->pmslen );
Paul Bakker5121ce52009-01-03 21:22:43 +0000582
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200583#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
584 if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED )
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200585 {
586 unsigned char session_hash[48];
587 size_t hash_len;
588
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200589 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) );
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200590
591 ssl->handshake->calc_verify( ssl, session_hash );
592
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200593#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
594 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200595 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200596#if defined(MBEDTLS_SHA512_C)
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200597 if( ssl->transform_negotiate->ciphersuite_info->mac ==
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200598 MBEDTLS_MD_SHA384 )
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200599 {
600 hash_len = 48;
601 }
602 else
603#endif
604 hash_len = 32;
605 }
606 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200607#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200608 hash_len = 36;
609
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200610 MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len );
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200611
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100612 ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
613 "extended master secret",
614 session_hash, hash_len,
615 session->master, 48 );
616 if( ret != 0 )
617 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200618 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100619 return( ret );
620 }
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200621
622 }
623 else
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +0200624#endif
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100625 ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
626 "master secret",
627 handshake->randbytes, 64,
628 session->master, 48 );
629 if( ret != 0 )
630 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200631 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100632 return( ret );
633 }
Manuel Pégourié-Gonnardada30302014-10-20 20:33:10 +0200634
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200635 mbedtls_zeroize( handshake->premaster, sizeof(handshake->premaster) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000636 }
637 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200638 MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000639
640 /*
641 * Swap the client and server random values.
642 */
Paul Bakker48916f92012-09-16 19:57:18 +0000643 memcpy( tmp, handshake->randbytes, 64 );
644 memcpy( handshake->randbytes, tmp + 32, 32 );
645 memcpy( handshake->randbytes + 32, tmp, 32 );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200646 mbedtls_zeroize( tmp, sizeof( tmp ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000647
648 /*
649 * SSLv3:
650 * key block =
651 * MD5( master + SHA1( 'A' + master + randbytes ) ) +
652 * MD5( master + SHA1( 'BB' + master + randbytes ) ) +
653 * MD5( master + SHA1( 'CCC' + master + randbytes ) ) +
654 * MD5( master + SHA1( 'DDDD' + master + randbytes ) ) +
655 * ...
656 *
657 * TLSv1:
658 * key block = PRF( master, "key expansion", randbytes )
659 */
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100660 ret = handshake->tls_prf( session->master, 48, "key expansion",
661 handshake->randbytes, 64, keyblk, 256 );
662 if( ret != 0 )
663 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200664 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
Manuel Pégourié-Gonnarde9608182015-03-26 11:47:47 +0100665 return( ret );
666 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000667
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200668 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s",
669 mbedtls_ssl_get_ciphersuite_name( session->ciphersuite ) ) );
670 MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", session->master, 48 );
671 MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", handshake->randbytes, 64 );
672 MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
Paul Bakker5121ce52009-01-03 21:22:43 +0000673
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200674 mbedtls_zeroize( handshake->randbytes, sizeof( handshake->randbytes ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000675
676 /*
677 * Determine the appropriate key, IV and MAC length.
678 */
Paul Bakker68884e32013-01-07 18:20:04 +0100679
Manuel Pégourié-Gonnard898e0aa2015-06-18 15:28:12 +0200680 transform->keylen = cipher_info->key_bitlen / 8;
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200681
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200682 if( cipher_info->mode == MBEDTLS_MODE_GCM ||
683 cipher_info->mode == MBEDTLS_MODE_CCM )
Paul Bakker5121ce52009-01-03 21:22:43 +0000684 {
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200685 transform->maclen = 0;
Hanno Becker64f0aed2017-11-09 18:39:33 +0000686 mac_key_len = 0;
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200687
Paul Bakker68884e32013-01-07 18:20:04 +0100688 transform->ivlen = 12;
689 transform->fixed_ivlen = 4;
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200690
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200691 /* Minimum length is expicit IV + tag */
692 transform->minlen = transform->ivlen - transform->fixed_ivlen
693 + ( transform->ciphersuite_info->flags &
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200694 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16 );
Paul Bakker68884e32013-01-07 18:20:04 +0100695 }
696 else
697 {
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200698 /* Initialize HMAC contexts */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200699 if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 ||
700 ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 )
Paul Bakker68884e32013-01-07 18:20:04 +0100701 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200702 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200703 return( ret );
Paul Bakker68884e32013-01-07 18:20:04 +0100704 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000705
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200706 /* Get MAC length */
Hanno Becker64f0aed2017-11-09 18:39:33 +0000707 mac_key_len = mbedtls_md_get_size( md_info );
708 transform->maclen = mac_key_len;
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200709
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200710#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200711 /*
712 * If HMAC is to be truncated, we shall keep the leftmost bytes,
713 * (rfc 6066 page 13 or rfc 2104 section 4),
714 * so we only need to adjust the length here.
715 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200716 if( session->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
Hanno Becker053b3452017-11-20 16:36:41 +0000717 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200718 transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN;
Hanno Becker053b3452017-11-20 16:36:41 +0000719
720#if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT)
721 /* Fall back to old, non-compliant version of the truncated
Hanno Beckeradb30b92017-11-21 17:20:17 +0000722 * HMAC implementation which also truncates the key (pre 2.1.10) */
Hanno Becker053b3452017-11-20 16:36:41 +0000723 mac_key_len = transform->maclen;
724#endif
725 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200726#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
Manuel Pégourié-Gonnarde800cd82014-06-18 15:34:40 +0200727
728 /* IV length */
Paul Bakker68884e32013-01-07 18:20:04 +0100729 transform->ivlen = cipher_info->iv_size;
Paul Bakker5121ce52009-01-03 21:22:43 +0000730
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200731 /* Minimum length */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200732 if( cipher_info->mode == MBEDTLS_MODE_STREAM )
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200733 transform->minlen = transform->maclen;
734 else
Paul Bakker68884e32013-01-07 18:20:04 +0100735 {
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200736 /*
737 * GenericBlockCipher:
Manuel Pégourié-Gonnard169dd6a2014-11-04 16:15:39 +0100738 * 1. if EtM is in use: one block plus MAC
739 * otherwise: * first multiple of blocklen greater than maclen
740 * 2. IV except for SSL3 and TLS 1.0
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200741 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200742#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
743 if( session->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
Manuel Pégourié-Gonnard169dd6a2014-11-04 16:15:39 +0100744 {
745 transform->minlen = transform->maclen
746 + cipher_info->block_size;
747 }
748 else
749#endif
750 {
751 transform->minlen = transform->maclen
752 + cipher_info->block_size
753 - transform->maclen % cipher_info->block_size;
754 }
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200755
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200756#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
757 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
758 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 )
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200759 ; /* No need to adjust minlen */
Paul Bakker68884e32013-01-07 18:20:04 +0100760 else
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200761#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200762#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
763 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 ||
764 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200765 {
766 transform->minlen += transform->ivlen;
767 }
768 else
769#endif
770 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200771 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
772 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardeaa76f72014-06-18 16:06:02 +0200773 }
Paul Bakker68884e32013-01-07 18:20:04 +0100774 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000775 }
776
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200777 MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d",
Paul Bakker48916f92012-09-16 19:57:18 +0000778 transform->keylen, transform->minlen, transform->ivlen,
779 transform->maclen ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000780
781 /*
782 * Finally setup the cipher contexts, IVs and MAC secrets.
783 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200784#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200785 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
Paul Bakker5121ce52009-01-03 21:22:43 +0000786 {
Hanno Becker64f0aed2017-11-09 18:39:33 +0000787 key1 = keyblk + mac_key_len * 2;
788 key2 = keyblk + mac_key_len * 2 + transform->keylen;
Paul Bakker5121ce52009-01-03 21:22:43 +0000789
Paul Bakker68884e32013-01-07 18:20:04 +0100790 mac_enc = keyblk;
Hanno Becker64f0aed2017-11-09 18:39:33 +0000791 mac_dec = keyblk + mac_key_len;
Paul Bakker5121ce52009-01-03 21:22:43 +0000792
Paul Bakker2e11f7d2010-07-25 14:24:53 +0000793 /*
794 * This is not used in TLS v1.1.
795 */
Paul Bakker48916f92012-09-16 19:57:18 +0000796 iv_copy_len = ( transform->fixed_ivlen ) ?
797 transform->fixed_ivlen : transform->ivlen;
798 memcpy( transform->iv_enc, key2 + transform->keylen, iv_copy_len );
799 memcpy( transform->iv_dec, key2 + transform->keylen + iv_copy_len,
Paul Bakkerca4ab492012-04-18 14:23:57 +0000800 iv_copy_len );
Paul Bakker5121ce52009-01-03 21:22:43 +0000801 }
802 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200803#endif /* MBEDTLS_SSL_CLI_C */
804#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +0200805 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Paul Bakker5121ce52009-01-03 21:22:43 +0000806 {
Hanno Becker64f0aed2017-11-09 18:39:33 +0000807 key1 = keyblk + mac_key_len * 2 + transform->keylen;
808 key2 = keyblk + mac_key_len * 2;
Paul Bakker5121ce52009-01-03 21:22:43 +0000809
Hanno Becker64f0aed2017-11-09 18:39:33 +0000810 mac_enc = keyblk + mac_key_len;
Paul Bakker68884e32013-01-07 18:20:04 +0100811 mac_dec = keyblk;
Paul Bakker5121ce52009-01-03 21:22:43 +0000812
Paul Bakker2e11f7d2010-07-25 14:24:53 +0000813 /*
814 * This is not used in TLS v1.1.
815 */
Paul Bakker48916f92012-09-16 19:57:18 +0000816 iv_copy_len = ( transform->fixed_ivlen ) ?
817 transform->fixed_ivlen : transform->ivlen;
818 memcpy( transform->iv_dec, key1 + transform->keylen, iv_copy_len );
819 memcpy( transform->iv_enc, key1 + transform->keylen + iv_copy_len,
Paul Bakkerca4ab492012-04-18 14:23:57 +0000820 iv_copy_len );
Paul Bakker5121ce52009-01-03 21:22:43 +0000821 }
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +0100822 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200823#endif /* MBEDTLS_SSL_SRV_C */
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +0100824 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200825 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
826 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +0100827 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000828
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200829#if defined(MBEDTLS_SSL_PROTO_SSL3)
830 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker68884e32013-01-07 18:20:04 +0100831 {
Hanno Becker64f0aed2017-11-09 18:39:33 +0000832 if( mac_key_len > sizeof transform->mac_enc )
Manuel Pégourié-Gonnard7cfdcb82014-01-18 18:22:55 +0100833 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200834 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
835 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard7cfdcb82014-01-18 18:22:55 +0100836 }
837
Hanno Becker64f0aed2017-11-09 18:39:33 +0000838 memcpy( transform->mac_enc, mac_enc, mac_key_len );
839 memcpy( transform->mac_dec, mac_dec, mac_key_len );
Paul Bakker68884e32013-01-07 18:20:04 +0100840 }
841 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200842#endif /* MBEDTLS_SSL_PROTO_SSL3 */
843#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
844 defined(MBEDTLS_SSL_PROTO_TLS1_2)
845 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
Paul Bakker68884e32013-01-07 18:20:04 +0100846 {
Gilles Peskine823734b2018-03-19 19:06:08 +0100847 /* For HMAC-based ciphersuites, initialize the HMAC transforms.
848 For AEAD-based ciphersuites, there is nothing to do here. */
849 if( mac_key_len != 0 )
850 {
851 mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, mac_key_len );
852 mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, mac_key_len );
853 }
Paul Bakker68884e32013-01-07 18:20:04 +0100854 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +0200855 else
856#endif
Paul Bakker577e0062013-08-28 11:57:20 +0200857 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200858 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
859 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker577e0062013-08-28 11:57:20 +0200860 }
Paul Bakker68884e32013-01-07 18:20:04 +0100861
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200862#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
863 if( mbedtls_ssl_hw_record_init != NULL )
Paul Bakker05ef8352012-05-08 09:17:57 +0000864 {
865 int ret = 0;
866
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200867 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) );
Paul Bakker05ef8352012-05-08 09:17:57 +0000868
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200869 if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, transform->keylen,
Paul Bakker07eb38b2012-12-19 14:42:06 +0100870 transform->iv_enc, transform->iv_dec,
871 iv_copy_len,
Paul Bakker68884e32013-01-07 18:20:04 +0100872 mac_enc, mac_dec,
Hanno Becker64f0aed2017-11-09 18:39:33 +0000873 mac_key_len ) ) != 0 )
Paul Bakker05ef8352012-05-08 09:17:57 +0000874 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200875 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret );
876 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Paul Bakker05ef8352012-05-08 09:17:57 +0000877 }
878 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200879#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
Paul Bakker05ef8352012-05-08 09:17:57 +0000880
Manuel Pégourié-Gonnard8473f872015-05-14 13:51:45 +0200881 if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc,
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200882 cipher_info ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +0000883 {
Manuel Pégourié-Gonnard8473f872015-05-14 13:51:45 +0200884 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200885 return( ret );
886 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +0200887
Manuel Pégourié-Gonnard8473f872015-05-14 13:51:45 +0200888 if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec,
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200889 cipher_info ) ) != 0 )
890 {
Manuel Pégourié-Gonnard8473f872015-05-14 13:51:45 +0200891 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200892 return( ret );
893 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +0200894
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200895 if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1,
Manuel Pégourié-Gonnard898e0aa2015-06-18 15:28:12 +0200896 cipher_info->key_bitlen,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200897 MBEDTLS_ENCRYPT ) ) != 0 )
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200898 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200899 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200900 return( ret );
901 }
Paul Bakkerea6ad3f2013-09-02 14:57:01 +0200902
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200903 if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2,
Manuel Pégourié-Gonnard898e0aa2015-06-18 15:28:12 +0200904 cipher_info->key_bitlen,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200905 MBEDTLS_DECRYPT ) ) != 0 )
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200906 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200907 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200908 return( ret );
909 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +0200910
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200911#if defined(MBEDTLS_CIPHER_MODE_CBC)
912 if( cipher_info->mode == MBEDTLS_MODE_CBC )
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200913 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200914 if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc,
915 MBEDTLS_PADDING_NONE ) ) != 0 )
Manuel Pégourié-Gonnard126a66f2013-10-25 18:33:32 +0200916 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200917 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200918 return( ret );
Manuel Pégourié-Gonnard126a66f2013-10-25 18:33:32 +0200919 }
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200920
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200921 if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec,
922 MBEDTLS_PADDING_NONE ) ) != 0 )
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200923 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200924 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
Manuel Pégourié-Gonnard88665912013-10-25 18:42:44 +0200925 return( ret );
926 }
Paul Bakker5121ce52009-01-03 21:22:43 +0000927 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200928#endif /* MBEDTLS_CIPHER_MODE_CBC */
Paul Bakker5121ce52009-01-03 21:22:43 +0000929
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200930 mbedtls_zeroize( keyblk, sizeof( keyblk ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000931
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200932#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker2770fbd2012-07-03 13:30:23 +0000933 // Initialize compression
934 //
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200935 if( session->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
Paul Bakker2770fbd2012-07-03 13:30:23 +0000936 {
Paul Bakker16770332013-10-11 09:59:44 +0200937 if( ssl->compress_buf == NULL )
938 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200939 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) );
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +0200940 ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_BUFFER_LEN );
Paul Bakker16770332013-10-11 09:59:44 +0200941 if( ssl->compress_buf == NULL )
942 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +0200943 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200944 MBEDTLS_SSL_BUFFER_LEN ) );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +0200945 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Paul Bakker16770332013-10-11 09:59:44 +0200946 }
947 }
948
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200949 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +0000950
Paul Bakker48916f92012-09-16 19:57:18 +0000951 memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) );
952 memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +0000953
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +0200954 if( deflateInit( &transform->ctx_deflate,
955 Z_DEFAULT_COMPRESSION ) != Z_OK ||
Paul Bakker48916f92012-09-16 19:57:18 +0000956 inflateInit( &transform->ctx_inflate ) != Z_OK )
Paul Bakker2770fbd2012-07-03 13:30:23 +0000957 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200958 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) );
959 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
Paul Bakker2770fbd2012-07-03 13:30:23 +0000960 }
961 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200962#endif /* MBEDTLS_ZLIB_SUPPORT */
Paul Bakker2770fbd2012-07-03 13:30:23 +0000963
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200964 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000965
966 return( 0 );
967}
968
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200969#if defined(MBEDTLS_SSL_PROTO_SSL3)
970void ssl_calc_verify_ssl( mbedtls_ssl_context *ssl, unsigned char hash[36] )
Paul Bakker5121ce52009-01-03 21:22:43 +0000971{
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200972 mbedtls_md5_context md5;
973 mbedtls_sha1_context sha1;
Paul Bakker5121ce52009-01-03 21:22:43 +0000974 unsigned char pad_1[48];
975 unsigned char pad_2[48];
976
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +0200977 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +0000978
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +0200979 mbedtls_md5_init( &md5 );
980 mbedtls_sha1_init( &sha1 );
981
982 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
983 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
Paul Bakker5121ce52009-01-03 21:22:43 +0000984
Paul Bakker380da532012-04-18 16:10:25 +0000985 memset( pad_1, 0x36, 48 );
986 memset( pad_2, 0x5C, 48 );
Paul Bakker5121ce52009-01-03 21:22:43 +0000987
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200988 mbedtls_md5_update( &md5, ssl->session_negotiate->master, 48 );
989 mbedtls_md5_update( &md5, pad_1, 48 );
990 mbedtls_md5_finish( &md5, hash );
Paul Bakker5121ce52009-01-03 21:22:43 +0000991
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200992 mbedtls_md5_starts( &md5 );
993 mbedtls_md5_update( &md5, ssl->session_negotiate->master, 48 );
994 mbedtls_md5_update( &md5, pad_2, 48 );
995 mbedtls_md5_update( &md5, hash, 16 );
996 mbedtls_md5_finish( &md5, hash );
Paul Bakker5121ce52009-01-03 21:22:43 +0000997
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +0200998 mbedtls_sha1_update( &sha1, ssl->session_negotiate->master, 48 );
999 mbedtls_sha1_update( &sha1, pad_1, 40 );
1000 mbedtls_sha1_finish( &sha1, hash + 16 );
Paul Bakker380da532012-04-18 16:10:25 +00001001
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001002 mbedtls_sha1_starts( &sha1 );
1003 mbedtls_sha1_update( &sha1, ssl->session_negotiate->master, 48 );
1004 mbedtls_sha1_update( &sha1, pad_2, 40 );
1005 mbedtls_sha1_update( &sha1, hash + 16, 20 );
1006 mbedtls_sha1_finish( &sha1, hash + 16 );
Paul Bakker380da532012-04-18 16:10:25 +00001007
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001008 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
1009 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001010
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001011 mbedtls_md5_free( &md5 );
1012 mbedtls_sha1_free( &sha1 );
Paul Bakker5b4af392014-06-26 12:09:34 +02001013
Paul Bakker380da532012-04-18 16:10:25 +00001014 return;
1015}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001016#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker380da532012-04-18 16:10:25 +00001017
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001018#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
1019void ssl_calc_verify_tls( mbedtls_ssl_context *ssl, unsigned char hash[36] )
Paul Bakker380da532012-04-18 16:10:25 +00001020{
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001021 mbedtls_md5_context md5;
1022 mbedtls_sha1_context sha1;
Paul Bakker380da532012-04-18 16:10:25 +00001023
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001024 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001025
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02001026 mbedtls_md5_init( &md5 );
1027 mbedtls_sha1_init( &sha1 );
1028
1029 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
1030 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
Paul Bakker380da532012-04-18 16:10:25 +00001031
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001032 mbedtls_md5_finish( &md5, hash );
1033 mbedtls_sha1_finish( &sha1, hash + 16 );
Paul Bakker380da532012-04-18 16:10:25 +00001034
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001035 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
1036 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001037
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001038 mbedtls_md5_free( &md5 );
1039 mbedtls_sha1_free( &sha1 );
Paul Bakker5b4af392014-06-26 12:09:34 +02001040
Paul Bakker380da532012-04-18 16:10:25 +00001041 return;
1042}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001043#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
Paul Bakker380da532012-04-18 16:10:25 +00001044
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001045#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
1046#if defined(MBEDTLS_SHA256_C)
1047void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *ssl, unsigned char hash[32] )
Paul Bakker380da532012-04-18 16:10:25 +00001048{
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001049 mbedtls_sha256_context sha256;
Paul Bakker380da532012-04-18 16:10:25 +00001050
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02001051 mbedtls_sha256_init( &sha256 );
1052
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001053 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001054
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02001055 mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001056 mbedtls_sha256_finish( &sha256, hash );
Paul Bakker380da532012-04-18 16:10:25 +00001057
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001058 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 );
1059 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001060
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001061 mbedtls_sha256_free( &sha256 );
Paul Bakker5b4af392014-06-26 12:09:34 +02001062
Paul Bakker380da532012-04-18 16:10:25 +00001063 return;
1064}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001065#endif /* MBEDTLS_SHA256_C */
Paul Bakker380da532012-04-18 16:10:25 +00001066
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001067#if defined(MBEDTLS_SHA512_C)
1068void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *ssl, unsigned char hash[48] )
Paul Bakker380da532012-04-18 16:10:25 +00001069{
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001070 mbedtls_sha512_context sha512;
Paul Bakker380da532012-04-18 16:10:25 +00001071
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02001072 mbedtls_sha512_init( &sha512 );
1073
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001074 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) );
Paul Bakker380da532012-04-18 16:10:25 +00001075
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001076 mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
1077 mbedtls_sha512_finish( &sha512, hash );
Paul Bakker5121ce52009-01-03 21:22:43 +00001078
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001079 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 );
1080 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001081
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02001082 mbedtls_sha512_free( &sha512 );
Paul Bakker5b4af392014-06-26 12:09:34 +02001083
Paul Bakker5121ce52009-01-03 21:22:43 +00001084 return;
1085}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001086#endif /* MBEDTLS_SHA512_C */
1087#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker5121ce52009-01-03 21:22:43 +00001088
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001089#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
1090int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001091{
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001092 unsigned char *p = ssl->handshake->premaster;
1093 unsigned char *end = p + sizeof( ssl->handshake->premaster );
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01001094 const unsigned char *psk = ssl->conf->psk;
1095 size_t psk_len = ssl->conf->psk_len;
1096
1097 /* If the psk callback was called, use its result */
1098 if( ssl->handshake->psk != NULL )
1099 {
1100 psk = ssl->handshake->psk;
1101 psk_len = ssl->handshake->psk_len;
1102 }
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001103
1104 /*
1105 * PMS = struct {
1106 * opaque other_secret<0..2^16-1>;
1107 * opaque psk<0..2^16-1>;
1108 * };
1109 * with "other_secret" depending on the particular key exchange
1110 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001111#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
1112 if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001113 {
Manuel Pégourié-Gonnardc2824052015-10-21 12:35:29 +02001114 if( end - p < 2 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001115 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001116
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01001117 *(p++) = (unsigned char)( psk_len >> 8 );
1118 *(p++) = (unsigned char)( psk_len );
Manuel Pégourié-Gonnardc2824052015-10-21 12:35:29 +02001119
1120 if( end < p || (size_t)( end - p ) < psk_len )
1121 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1122
1123 memset( p, 0, psk_len );
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01001124 p += psk_len;
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001125 }
1126 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001127#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
1128#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
1129 if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02001130 {
1131 /*
1132 * other_secret already set by the ClientKeyExchange message,
1133 * and is 48 bytes long
1134 */
Philippe Antoinebbc79182018-05-30 09:13:21 +02001135 if( end - p < 2 )
1136 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1137
Manuel Pégourié-Gonnard0fae60b2013-10-14 17:39:48 +02001138 *p++ = 0;
1139 *p++ = 48;
1140 p += 48;
1141 }
1142 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001143#endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
1144#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
1145 if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001146 {
Manuel Pégourié-Gonnard1b62c7f2013-10-14 14:02:19 +02001147 int ret;
Manuel Pégourié-Gonnard33352052015-06-02 16:17:08 +01001148 size_t len;
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001149
Manuel Pégourié-Gonnard8df68632014-06-23 17:56:08 +02001150 /* Write length only when we know the actual value */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001151 if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
Manuel Pégourié-Gonnard33352052015-06-02 16:17:08 +01001152 p + 2, end - ( p + 2 ), &len,
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01001153 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001154 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001155 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001156 return( ret );
1157 }
Manuel Pégourié-Gonnard8df68632014-06-23 17:56:08 +02001158 *(p++) = (unsigned char)( len >> 8 );
1159 *(p++) = (unsigned char)( len );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001160 p += len;
1161
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001162 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001163 }
1164 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001165#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
1166#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
1167 if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001168 {
Manuel Pégourié-Gonnard1b62c7f2013-10-14 14:02:19 +02001169 int ret;
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001170 size_t zlen;
1171
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001172 if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen,
Paul Bakker66d5d072014-06-17 16:39:18 +02001173 p + 2, end - ( p + 2 ),
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01001174 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001175 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001176 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001177 return( ret );
1178 }
1179
1180 *(p++) = (unsigned char)( zlen >> 8 );
1181 *(p++) = (unsigned char)( zlen );
1182 p += zlen;
1183
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001184 MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001185 }
1186 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001187#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001188 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001189 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1190 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001191 }
1192
1193 /* opaque psk<0..2^16-1>; */
Manuel Pégourié-Gonnardc2824052015-10-21 12:35:29 +02001194 if( end - p < 2 )
1195 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnardb2bf5a12014-03-25 16:28:12 +01001196
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01001197 *(p++) = (unsigned char)( psk_len >> 8 );
1198 *(p++) = (unsigned char)( psk_len );
Manuel Pégourié-Gonnardc2824052015-10-21 12:35:29 +02001199
1200 if( end < p || (size_t)( end - p ) < psk_len )
1201 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1202
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01001203 memcpy( p, psk, psk_len );
1204 p += psk_len;
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001205
1206 ssl->handshake->pmslen = p - ssl->handshake->premaster;
1207
1208 return( 0 );
1209}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001210#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
Manuel Pégourié-Gonnardbd1ae242013-10-14 13:09:25 +02001211
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001212#if defined(MBEDTLS_SSL_PROTO_SSL3)
Paul Bakker5121ce52009-01-03 21:22:43 +00001213/*
1214 * SSLv3.0 MAC functions
1215 */
Manuel Pégourié-Gonnard4b133e62017-12-19 10:03:46 +01001216#define SSL_MAC_MAX_BYTES 20 /* MD-5 or SHA-1 */
Manuel Pégourié-Gonnardb67a5c12017-12-18 18:04:59 +01001217static void ssl_mac( mbedtls_md_context_t *md_ctx,
1218 const unsigned char *secret,
1219 const unsigned char *buf, size_t len,
1220 const unsigned char *ctr, int type,
Manuel Pégourié-Gonnard4b133e62017-12-19 10:03:46 +01001221 unsigned char out[SSL_MAC_MAX_BYTES] )
Paul Bakker5121ce52009-01-03 21:22:43 +00001222{
1223 unsigned char header[11];
1224 unsigned char padding[48];
Manuel Pégourié-Gonnard8d4ad072014-07-13 14:43:28 +02001225 int padlen;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001226 int md_size = mbedtls_md_get_size( md_ctx->md_info );
1227 int md_type = mbedtls_md_get_type( md_ctx->md_info );
Paul Bakker68884e32013-01-07 18:20:04 +01001228
Manuel Pégourié-Gonnard8d4ad072014-07-13 14:43:28 +02001229 /* Only MD5 and SHA-1 supported */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001230 if( md_type == MBEDTLS_MD_MD5 )
Paul Bakker68884e32013-01-07 18:20:04 +01001231 padlen = 48;
Manuel Pégourié-Gonnard8d4ad072014-07-13 14:43:28 +02001232 else
Paul Bakker68884e32013-01-07 18:20:04 +01001233 padlen = 40;
Paul Bakker5121ce52009-01-03 21:22:43 +00001234
1235 memcpy( header, ctr, 8 );
1236 header[ 8] = (unsigned char) type;
1237 header[ 9] = (unsigned char)( len >> 8 );
1238 header[10] = (unsigned char)( len );
1239
Paul Bakker68884e32013-01-07 18:20:04 +01001240 memset( padding, 0x36, padlen );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001241 mbedtls_md_starts( md_ctx );
1242 mbedtls_md_update( md_ctx, secret, md_size );
1243 mbedtls_md_update( md_ctx, padding, padlen );
1244 mbedtls_md_update( md_ctx, header, 11 );
1245 mbedtls_md_update( md_ctx, buf, len );
Manuel Pégourié-Gonnardb67a5c12017-12-18 18:04:59 +01001246 mbedtls_md_finish( md_ctx, out );
Paul Bakker5121ce52009-01-03 21:22:43 +00001247
Paul Bakker68884e32013-01-07 18:20:04 +01001248 memset( padding, 0x5C, padlen );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001249 mbedtls_md_starts( md_ctx );
1250 mbedtls_md_update( md_ctx, secret, md_size );
1251 mbedtls_md_update( md_ctx, padding, padlen );
Manuel Pégourié-Gonnardb67a5c12017-12-18 18:04:59 +01001252 mbedtls_md_update( md_ctx, out, md_size );
1253 mbedtls_md_finish( md_ctx, out );
Paul Bakker5f70b252012-09-13 14:23:06 +00001254}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001255#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker5f70b252012-09-13 14:23:06 +00001256
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001257#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) || \
1258 ( defined(MBEDTLS_CIPHER_MODE_CBC) && \
1259 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) ) )
Manuel Pégourié-Gonnard8408a942015-04-09 12:14:31 +02001260#define SSL_SOME_MODES_USE_MAC
Manuel Pégourié-Gonnard8e4b3372014-11-17 15:06:13 +01001261#endif
1262
Manuel Pégourié-Gonnard0098e7d2014-10-28 13:08:59 +01001263/*
Paul Bakker5121ce52009-01-03 21:22:43 +00001264 * Encryption/decryption functions
Paul Bakkerf7abd422013-04-16 13:15:56 +02001265 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001266static int ssl_encrypt_buf( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00001267{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001268 mbedtls_cipher_mode_t mode;
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001269 int auth_done = 0;
Paul Bakker5121ce52009-01-03 21:22:43 +00001270
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001271 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001272
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001273 if( ssl->session_out == NULL || ssl->transform_out == NULL )
1274 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001275 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1276 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001277 }
1278
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001279 mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001280
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001281 MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload",
Manuel Pégourié-Gonnard60346be2014-11-21 11:38:37 +01001282 ssl->out_msg, ssl->out_msglen );
1283
Hanno Beckeraede1832017-09-18 10:55:31 +01001284 if( ssl->out_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
1285 {
Hanno Becker6e052b02017-10-04 13:47:33 +01001286 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Record content %u too large, maximum %d",
1287 (unsigned) ssl->out_msglen,
Hanno Beckeraede1832017-09-18 10:55:31 +01001288 MBEDTLS_SSL_MAX_CONTENT_LEN ) );
1289 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1290 }
1291
Paul Bakker5121ce52009-01-03 21:22:43 +00001292 /*
Manuel Pégourié-Gonnard0098e7d2014-10-28 13:08:59 +01001293 * Add MAC before if needed
Paul Bakker5121ce52009-01-03 21:22:43 +00001294 */
Manuel Pégourié-Gonnard8408a942015-04-09 12:14:31 +02001295#if defined(SSL_SOME_MODES_USE_MAC)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001296 if( mode == MBEDTLS_MODE_STREAM ||
1297 ( mode == MBEDTLS_MODE_CBC
1298#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
1299 && ssl->session_out->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001300#endif
1301 ) )
Paul Bakker5121ce52009-01-03 21:22:43 +00001302 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001303#if defined(MBEDTLS_SSL_PROTO_SSL3)
1304 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001305 {
Manuel Pégourié-Gonnard4b133e62017-12-19 10:03:46 +01001306 unsigned char mac[SSL_MAC_MAX_BYTES];
Manuel Pégourié-Gonnardb67a5c12017-12-18 18:04:59 +01001307
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001308 ssl_mac( &ssl->transform_out->md_ctx_enc,
1309 ssl->transform_out->mac_enc,
1310 ssl->out_msg, ssl->out_msglen,
Manuel Pégourié-Gonnardb67a5c12017-12-18 18:04:59 +01001311 ssl->out_ctr, ssl->out_msgtype,
1312 mac );
1313
1314 memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001315 }
1316 else
Paul Bakkerd2f068e2013-08-27 21:19:20 +02001317#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001318#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1319 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1320 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001321 {
Hanno Beckerce516ff2017-11-09 18:57:39 +00001322 unsigned char mac[MBEDTLS_SSL_MAC_ADD];
1323
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001324 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_ctr, 8 );
1325 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_hdr, 3 );
1326 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_len, 2 );
1327 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001328 ssl->out_msg, ssl->out_msglen );
Hanno Beckerce516ff2017-11-09 18:57:39 +00001329 mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc, mac );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001330 mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
Hanno Beckerce516ff2017-11-09 18:57:39 +00001331
1332 memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001333 }
1334 else
Paul Bakkerd2f068e2013-08-27 21:19:20 +02001335#endif
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001336 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001337 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1338 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001339 }
1340
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001341 MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac",
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001342 ssl->out_msg + ssl->out_msglen,
1343 ssl->transform_out->maclen );
1344
1345 ssl->out_msglen += ssl->transform_out->maclen;
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001346 auth_done++;
Paul Bakker577e0062013-08-28 11:57:20 +02001347 }
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001348#endif /* AEAD not the only option */
Paul Bakker5121ce52009-01-03 21:22:43 +00001349
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001350 /*
1351 * Encrypt
1352 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001353#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
1354 if( mode == MBEDTLS_MODE_STREAM )
Paul Bakker5121ce52009-01-03 21:22:43 +00001355 {
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001356 int ret;
1357 size_t olen = 0;
1358
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001359 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
Paul Bakker5121ce52009-01-03 21:22:43 +00001360 "including %d bytes of padding",
1361 ssl->out_msglen, 0 ) );
1362
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001363 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
Paul Bakker45125bc2013-09-04 16:47:11 +02001364 ssl->transform_out->iv_enc,
Manuel Pégourié-Gonnard8764d272014-05-13 11:52:02 +02001365 ssl->transform_out->ivlen,
1366 ssl->out_msg, ssl->out_msglen,
1367 ssl->out_msg, &olen ) ) != 0 )
Paul Bakker45125bc2013-09-04 16:47:11 +02001368 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001369 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001370 return( ret );
1371 }
1372
1373 if( ssl->out_msglen != olen )
1374 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001375 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1376 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001377 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001378 }
Paul Bakker68884e32013-01-07 18:20:04 +01001379 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001380#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
1381#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
1382 if( mode == MBEDTLS_MODE_GCM ||
1383 mode == MBEDTLS_MODE_CCM )
Paul Bakkerca4ab492012-04-18 14:23:57 +00001384 {
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001385 int ret;
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001386 size_t enc_msglen, olen;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001387 unsigned char *enc_msg;
1388 unsigned char add_data[13];
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001389 unsigned char taglen = ssl->transform_out->ciphersuite_info->flags &
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001390 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001391
Paul Bakkerca4ab492012-04-18 14:23:57 +00001392 memcpy( add_data, ssl->out_ctr, 8 );
1393 add_data[8] = ssl->out_msgtype;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001394 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001395 ssl->conf->transport, add_data + 9 );
Paul Bakkerca4ab492012-04-18 14:23:57 +00001396 add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF;
1397 add_data[12] = ssl->out_msglen & 0xFF;
1398
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001399 MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
Paul Bakkerca4ab492012-04-18 14:23:57 +00001400 add_data, 13 );
1401
Paul Bakker68884e32013-01-07 18:20:04 +01001402 /*
1403 * Generate IV
1404 */
Manuel Pégourié-Gonnardd056ce02014-10-29 22:29:20 +01001405 if( ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen != 8 )
1406 {
1407 /* Reminder if we ever add an AEAD mode with a different size */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001408 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1409 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardd056ce02014-10-29 22:29:20 +01001410 }
1411
1412 memcpy( ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen,
1413 ssl->out_ctr, 8 );
1414 memcpy( ssl->out_iv, ssl->out_ctr, 8 );
Paul Bakkerca4ab492012-04-18 14:23:57 +00001415
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001416 MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->out_iv,
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02001417 ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen );
Manuel Pégourié-Gonnard226d5da2013-09-05 13:19:22 +02001418
Paul Bakker68884e32013-01-07 18:20:04 +01001419 /*
1420 * Fix pointer positions and message length with added IV
1421 */
1422 enc_msg = ssl->out_msg;
1423 enc_msglen = ssl->out_msglen;
1424 ssl->out_msglen += ssl->transform_out->ivlen -
1425 ssl->transform_out->fixed_ivlen;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001426
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001427 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
Paul Bakker68884e32013-01-07 18:20:04 +01001428 "including %d bytes of padding",
1429 ssl->out_msglen, 0 ) );
Paul Bakkerca4ab492012-04-18 14:23:57 +00001430
Paul Bakker68884e32013-01-07 18:20:04 +01001431 /*
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001432 * Encrypt and authenticate
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001433 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001434 if( ( ret = mbedtls_cipher_auth_encrypt( &ssl->transform_out->cipher_ctx_enc,
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001435 ssl->transform_out->iv_enc,
1436 ssl->transform_out->ivlen,
1437 add_data, 13,
1438 enc_msg, enc_msglen,
1439 enc_msg, &olen,
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001440 enc_msg + enc_msglen, taglen ) ) != 0 )
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001441 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001442 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_encrypt", ret );
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001443 return( ret );
1444 }
1445
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001446 if( olen != enc_msglen )
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001447 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001448 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1449 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001450 }
1451
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001452 ssl->out_msglen += taglen;
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001453 auth_done++;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001454
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001455 MBEDTLS_SSL_DEBUG_BUF( 4, "after encrypt: tag", enc_msg + enc_msglen, taglen );
Paul Bakkerca4ab492012-04-18 14:23:57 +00001456 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001457 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001458#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
1459#if defined(MBEDTLS_CIPHER_MODE_CBC) && \
1460 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) )
1461 if( mode == MBEDTLS_MODE_CBC )
Paul Bakker5121ce52009-01-03 21:22:43 +00001462 {
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001463 int ret;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001464 unsigned char *enc_msg;
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +01001465 size_t enc_msglen, padlen, olen = 0, i;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001466
Paul Bakker48916f92012-09-16 19:57:18 +00001467 padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) %
1468 ssl->transform_out->ivlen;
1469 if( padlen == ssl->transform_out->ivlen )
Paul Bakker5121ce52009-01-03 21:22:43 +00001470 padlen = 0;
1471
1472 for( i = 0; i <= padlen; i++ )
1473 ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen;
1474
1475 ssl->out_msglen += padlen + 1;
1476
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001477 enc_msglen = ssl->out_msglen;
1478 enc_msg = ssl->out_msg;
1479
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001480#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001481 /*
Paul Bakker1ef83d62012-04-11 12:09:53 +00001482 * Prepend per-record IV for block cipher in TLS v1.1 and up as per
1483 * Method 1 (6.2.3.2. in RFC4346 and RFC5246)
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001484 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001485 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001486 {
1487 /*
1488 * Generate IV
1489 */
Manuel Pégourié-Gonnardea356662015-08-27 12:02:40 +02001490 ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc,
Paul Bakker48916f92012-09-16 19:57:18 +00001491 ssl->transform_out->ivlen );
Paul Bakkera3d195c2011-11-27 21:07:34 +00001492 if( ret != 0 )
1493 return( ret );
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001494
Paul Bakker92be97b2013-01-02 17:30:03 +01001495 memcpy( ssl->out_iv, ssl->transform_out->iv_enc,
Paul Bakker48916f92012-09-16 19:57:18 +00001496 ssl->transform_out->ivlen );
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001497
1498 /*
1499 * Fix pointer positions and message length with added IV
1500 */
Paul Bakker92be97b2013-01-02 17:30:03 +01001501 enc_msg = ssl->out_msg;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001502 enc_msglen = ssl->out_msglen;
Paul Bakker48916f92012-09-16 19:57:18 +00001503 ssl->out_msglen += ssl->transform_out->ivlen;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001504 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001505#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001506
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001507 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001508 "including %d bytes of IV and %d bytes of padding",
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02001509 ssl->out_msglen, ssl->transform_out->ivlen,
1510 padlen + 1 ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001511
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001512 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
Paul Bakker45125bc2013-09-04 16:47:11 +02001513 ssl->transform_out->iv_enc,
Manuel Pégourié-Gonnard8764d272014-05-13 11:52:02 +02001514 ssl->transform_out->ivlen,
1515 enc_msg, enc_msglen,
1516 enc_msg, &olen ) ) != 0 )
Paul Bakker45125bc2013-09-04 16:47:11 +02001517 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001518 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
Paul Bakkercca5b812013-08-31 17:40:26 +02001519 return( ret );
1520 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001521
Paul Bakkercca5b812013-08-31 17:40:26 +02001522 if( enc_msglen != olen )
1523 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001524 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1525 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakkercca5b812013-08-31 17:40:26 +02001526 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001527
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001528#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
1529 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakkercca5b812013-08-31 17:40:26 +02001530 {
1531 /*
1532 * Save IV in SSL3 and TLS1
1533 */
1534 memcpy( ssl->transform_out->iv_enc,
1535 ssl->transform_out->cipher_ctx_enc.iv,
1536 ssl->transform_out->ivlen );
Paul Bakker5121ce52009-01-03 21:22:43 +00001537 }
Paul Bakkercca5b812013-08-31 17:40:26 +02001538#endif
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001539
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001540#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001541 if( auth_done == 0 )
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001542 {
1543 /*
1544 * MAC(MAC_write_key, seq_num +
1545 * TLSCipherText.type +
1546 * TLSCipherText.version +
Manuel Pégourié-Gonnard08558e52014-11-04 14:40:21 +01001547 * length_of( (IV +) ENC(...) ) +
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001548 * IV + // except for TLS 1.0
1549 * ENC(content + padding + padding_length));
1550 */
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001551 unsigned char pseudo_hdr[13];
1552
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001553 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001554
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001555 memcpy( pseudo_hdr + 0, ssl->out_ctr, 8 );
1556 memcpy( pseudo_hdr + 8, ssl->out_hdr, 3 );
Manuel Pégourié-Gonnard08558e52014-11-04 14:40:21 +01001557 pseudo_hdr[11] = (unsigned char)( ( ssl->out_msglen >> 8 ) & 0xFF );
1558 pseudo_hdr[12] = (unsigned char)( ( ssl->out_msglen ) & 0xFF );
1559
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001560 MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001561
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001562 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, pseudo_hdr, 13 );
1563 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001564 ssl->out_iv, ssl->out_msglen );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001565 mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc,
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001566 ssl->out_iv + ssl->out_msglen );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001567 mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001568
1569 ssl->out_msglen += ssl->transform_out->maclen;
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001570 auth_done++;
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001571 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001572#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
Paul Bakker5121ce52009-01-03 21:22:43 +00001573 }
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001574 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001575#endif /* MBEDTLS_CIPHER_MODE_CBC &&
1576 ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001577 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001578 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1579 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001580 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001581
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001582 /* Make extra sure authentication was performed, exactly once */
1583 if( auth_done != 1 )
1584 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001585 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1586 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001587 }
1588
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001589 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001590
1591 return( 0 );
1592}
1593
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001594static int ssl_decrypt_buf( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00001595{
Paul Bakker1e5369c2013-12-19 16:40:57 +01001596 size_t i;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001597 mbedtls_cipher_mode_t mode;
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001598 int auth_done = 0;
Manuel Pégourié-Gonnard8408a942015-04-09 12:14:31 +02001599#if defined(SSL_SOME_MODES_USE_MAC)
Paul Bakker1e5369c2013-12-19 16:40:57 +01001600 size_t padlen = 0, correct = 1;
1601#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00001602
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001603 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00001604
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001605 if( ssl->session_in == NULL || ssl->transform_in == NULL )
1606 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001607 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1608 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001609 }
1610
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001611 mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_in->cipher_ctx_dec );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001612
Paul Bakker48916f92012-09-16 19:57:18 +00001613 if( ssl->in_msglen < ssl->transform_in->minlen )
Paul Bakker5121ce52009-01-03 21:22:43 +00001614 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001615 MBEDTLS_SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)",
Paul Bakker48916f92012-09-16 19:57:18 +00001616 ssl->in_msglen, ssl->transform_in->minlen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001617 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Paul Bakker5121ce52009-01-03 21:22:43 +00001618 }
1619
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001620#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
1621 if( mode == MBEDTLS_MODE_STREAM )
Paul Bakker68884e32013-01-07 18:20:04 +01001622 {
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001623 int ret;
1624 size_t olen = 0;
1625
Paul Bakker68884e32013-01-07 18:20:04 +01001626 padlen = 0;
1627
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001628 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
Paul Bakker45125bc2013-09-04 16:47:11 +02001629 ssl->transform_in->iv_dec,
Manuel Pégourié-Gonnard8764d272014-05-13 11:52:02 +02001630 ssl->transform_in->ivlen,
1631 ssl->in_msg, ssl->in_msglen,
1632 ssl->in_msg, &olen ) ) != 0 )
Paul Bakker45125bc2013-09-04 16:47:11 +02001633 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001634 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001635 return( ret );
1636 }
1637
1638 if( ssl->in_msglen != olen )
1639 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001640 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1641 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakkerea6ad3f2013-09-02 14:57:01 +02001642 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001643 }
Paul Bakker68884e32013-01-07 18:20:04 +01001644 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001645#endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
1646#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
1647 if( mode == MBEDTLS_MODE_GCM ||
1648 mode == MBEDTLS_MODE_CCM )
Paul Bakkerca4ab492012-04-18 14:23:57 +00001649 {
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001650 int ret;
1651 size_t dec_msglen, olen;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001652 unsigned char *dec_msg;
1653 unsigned char *dec_msg_result;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001654 unsigned char add_data[13];
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001655 unsigned char taglen = ssl->transform_in->ciphersuite_info->flags &
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001656 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02001657 size_t explicit_iv_len = ssl->transform_in->ivlen -
1658 ssl->transform_in->fixed_ivlen;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001659
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02001660 if( ssl->in_msglen < explicit_iv_len + taglen )
Manuel Pégourié-Gonnard0bcc4e12014-06-17 10:54:17 +02001661 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001662 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) "
Manuel Pégourié-Gonnard0bcc4e12014-06-17 10:54:17 +02001663 "+ taglen (%d)", ssl->in_msglen,
1664 explicit_iv_len, taglen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001665 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnard0bcc4e12014-06-17 10:54:17 +02001666 }
1667 dec_msglen = ssl->in_msglen - explicit_iv_len - taglen;
1668
Paul Bakker68884e32013-01-07 18:20:04 +01001669 dec_msg = ssl->in_msg;
1670 dec_msg_result = ssl->in_msg;
1671 ssl->in_msglen = dec_msglen;
1672
1673 memcpy( add_data, ssl->in_ctr, 8 );
1674 add_data[8] = ssl->in_msgtype;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001675 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02001676 ssl->conf->transport, add_data + 9 );
Paul Bakker68884e32013-01-07 18:20:04 +01001677 add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF;
1678 add_data[12] = ssl->in_msglen & 0xFF;
1679
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001680 MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
Paul Bakker68884e32013-01-07 18:20:04 +01001681 add_data, 13 );
1682
1683 memcpy( ssl->transform_in->iv_dec + ssl->transform_in->fixed_ivlen,
1684 ssl->in_iv,
1685 ssl->transform_in->ivlen - ssl->transform_in->fixed_ivlen );
1686
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001687 MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->transform_in->iv_dec,
Paul Bakker68884e32013-01-07 18:20:04 +01001688 ssl->transform_in->ivlen );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001689 MBEDTLS_SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, taglen );
Paul Bakker68884e32013-01-07 18:20:04 +01001690
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001691 /*
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001692 * Decrypt and authenticate
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001693 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001694 if( ( ret = mbedtls_cipher_auth_decrypt( &ssl->transform_in->cipher_ctx_dec,
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001695 ssl->transform_in->iv_dec,
1696 ssl->transform_in->ivlen,
1697 add_data, 13,
1698 dec_msg, dec_msglen,
1699 dec_msg_result, &olen,
Manuel Pégourié-Gonnard2e5ee322014-05-14 13:09:22 +02001700 dec_msg + dec_msglen, taglen ) ) != 0 )
Paul Bakkerca4ab492012-04-18 14:23:57 +00001701 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001702 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_decrypt", ret );
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001703
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001704 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
1705 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001706
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001707 return( ret );
1708 }
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001709 auth_done++;
Paul Bakkerca4ab492012-04-18 14:23:57 +00001710
Manuel Pégourié-Gonnardde7bb442014-05-13 12:41:10 +02001711 if( olen != dec_msglen )
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001712 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001713 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1714 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardd13a4092013-09-05 16:10:41 +02001715 }
Paul Bakkerca4ab492012-04-18 14:23:57 +00001716 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001717 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001718#endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
1719#if defined(MBEDTLS_CIPHER_MODE_CBC) && \
1720 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) )
1721 if( mode == MBEDTLS_MODE_CBC )
Paul Bakker5121ce52009-01-03 21:22:43 +00001722 {
Paul Bakker45829992013-01-03 14:52:21 +01001723 /*
1724 * Decrypt and check the padding
1725 */
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001726 int ret;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001727 unsigned char *dec_msg;
1728 unsigned char *dec_msg_result;
Paul Bakker23986e52011-04-24 08:57:21 +00001729 size_t dec_msglen;
Paul Bakkere47b34b2013-02-27 14:48:00 +01001730 size_t minlen = 0;
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001731 size_t olen = 0;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001732
Paul Bakker5121ce52009-01-03 21:22:43 +00001733 /*
Paul Bakker45829992013-01-03 14:52:21 +01001734 * Check immediate ciphertext sanity
Paul Bakker5121ce52009-01-03 21:22:43 +00001735 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001736#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
1737 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakker45829992013-01-03 14:52:21 +01001738 minlen += ssl->transform_in->ivlen;
Paul Bakkerd2f068e2013-08-27 21:19:20 +02001739#endif
Paul Bakker45829992013-01-03 14:52:21 +01001740
1741 if( ssl->in_msglen < minlen + ssl->transform_in->ivlen ||
1742 ssl->in_msglen < minlen + ssl->transform_in->maclen + 1 )
1743 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001744 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) "
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02001745 "+ 1 ) ( + expl IV )", ssl->in_msglen,
1746 ssl->transform_in->ivlen,
1747 ssl->transform_in->maclen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001748 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Paul Bakker45829992013-01-03 14:52:21 +01001749 }
1750
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001751 dec_msglen = ssl->in_msglen;
1752 dec_msg = ssl->in_msg;
1753 dec_msg_result = ssl->in_msg;
1754
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001755 /*
1756 * Authenticate before decrypt if enabled
1757 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001758#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
1759 if( ssl->session_in->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001760 {
Hanno Beckerce516ff2017-11-09 18:57:39 +00001761 unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD];
Manuel Pégourié-Gonnard08558e52014-11-04 14:40:21 +01001762 unsigned char pseudo_hdr[13];
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001763
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001764 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001765
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001766 dec_msglen -= ssl->transform_in->maclen;
1767 ssl->in_msglen -= ssl->transform_in->maclen;
1768
Manuel Pégourié-Gonnard08558e52014-11-04 14:40:21 +01001769 memcpy( pseudo_hdr + 0, ssl->in_ctr, 8 );
1770 memcpy( pseudo_hdr + 8, ssl->in_hdr, 3 );
1771 pseudo_hdr[11] = (unsigned char)( ( ssl->in_msglen >> 8 ) & 0xFF );
1772 pseudo_hdr[12] = (unsigned char)( ( ssl->in_msglen ) & 0xFF );
1773
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001774 MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
Manuel Pégourié-Gonnard08558e52014-11-04 14:40:21 +01001775
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001776 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, pseudo_hdr, 13 );
1777 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec,
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001778 ssl->in_iv, ssl->in_msglen );
Hanno Beckerce516ff2017-11-09 18:57:39 +00001779 mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001780 mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001781
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001782 MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_iv + ssl->in_msglen,
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001783 ssl->transform_in->maclen );
Hanno Beckerce516ff2017-11-09 18:57:39 +00001784 MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect,
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001785 ssl->transform_in->maclen );
1786
Hanno Beckerce516ff2017-11-09 18:57:39 +00001787 if( mbedtls_ssl_safer_memcmp( ssl->in_iv + ssl->in_msglen, mac_expect,
1788 ssl->transform_in->maclen ) != 0 )
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001789 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001790 MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001791
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001792 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001793 }
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001794 auth_done++;
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001795 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001796#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001797
1798 /*
1799 * Check length sanity
1800 */
1801 if( ssl->in_msglen % ssl->transform_in->ivlen != 0 )
1802 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001803 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0",
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001804 ssl->in_msglen, ssl->transform_in->ivlen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001805 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001806 }
1807
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001808#if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001809 /*
Paul Bakker1ef83d62012-04-11 12:09:53 +00001810 * Initialize for prepended IV for block cipher in TLS v1.1 and up
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001811 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001812 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001813 {
Paul Bakker48916f92012-09-16 19:57:18 +00001814 dec_msglen -= ssl->transform_in->ivlen;
1815 ssl->in_msglen -= ssl->transform_in->ivlen;
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001816
Paul Bakker48916f92012-09-16 19:57:18 +00001817 for( i = 0; i < ssl->transform_in->ivlen; i++ )
Paul Bakker92be97b2013-01-02 17:30:03 +01001818 ssl->transform_in->iv_dec[i] = ssl->in_iv[i];
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001819 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001820#endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker2e11f7d2010-07-25 14:24:53 +00001821
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001822 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
Paul Bakker45125bc2013-09-04 16:47:11 +02001823 ssl->transform_in->iv_dec,
Manuel Pégourié-Gonnard8764d272014-05-13 11:52:02 +02001824 ssl->transform_in->ivlen,
1825 dec_msg, dec_msglen,
1826 dec_msg_result, &olen ) ) != 0 )
Paul Bakker45125bc2013-09-04 16:47:11 +02001827 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001828 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
Paul Bakkercca5b812013-08-31 17:40:26 +02001829 return( ret );
1830 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001831
Paul Bakkercca5b812013-08-31 17:40:26 +02001832 if( dec_msglen != olen )
1833 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001834 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1835 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakkercca5b812013-08-31 17:40:26 +02001836 }
Paul Bakkerda02a7f2013-08-31 17:25:14 +02001837
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001838#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
1839 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakkercca5b812013-08-31 17:40:26 +02001840 {
1841 /*
1842 * Save IV in SSL3 and TLS1
1843 */
1844 memcpy( ssl->transform_in->iv_dec,
1845 ssl->transform_in->cipher_ctx_dec.iv,
1846 ssl->transform_in->ivlen );
Paul Bakker5121ce52009-01-03 21:22:43 +00001847 }
Paul Bakkercca5b812013-08-31 17:40:26 +02001848#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00001849
1850 padlen = 1 + ssl->in_msg[ssl->in_msglen - 1];
Paul Bakker45829992013-01-03 14:52:21 +01001851
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001852 if( ssl->in_msglen < ssl->transform_in->maclen + padlen &&
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001853 auth_done == 0 )
Paul Bakker45829992013-01-03 14:52:21 +01001854 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001855#if defined(MBEDTLS_SSL_DEBUG_ALL)
1856 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)",
Paul Bakker45829992013-01-03 14:52:21 +01001857 ssl->in_msglen, ssl->transform_in->maclen, padlen ) );
Paul Bakkerd66f0702013-01-31 16:57:45 +01001858#endif
Paul Bakker45829992013-01-03 14:52:21 +01001859 padlen = 0;
Paul Bakker45829992013-01-03 14:52:21 +01001860 correct = 0;
1861 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001862
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001863#if defined(MBEDTLS_SSL_PROTO_SSL3)
1864 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00001865 {
Paul Bakker48916f92012-09-16 19:57:18 +00001866 if( padlen > ssl->transform_in->ivlen )
Paul Bakker5121ce52009-01-03 21:22:43 +00001867 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001868#if defined(MBEDTLS_SSL_DEBUG_ALL)
1869 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, "
Paul Bakker5121ce52009-01-03 21:22:43 +00001870 "should be no more than %d",
Paul Bakker48916f92012-09-16 19:57:18 +00001871 padlen, ssl->transform_in->ivlen ) );
Paul Bakkerd66f0702013-01-31 16:57:45 +01001872#endif
Paul Bakker45829992013-01-03 14:52:21 +01001873 correct = 0;
Paul Bakker5121ce52009-01-03 21:22:43 +00001874 }
1875 }
1876 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001877#endif /* MBEDTLS_SSL_PROTO_SSL3 */
1878#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1879 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1880 if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00001881 {
1882 /*
Paul Bakker45829992013-01-03 14:52:21 +01001883 * TLSv1+: always check the padding up to the first failure
1884 * and fake check up to 256 bytes of padding
Paul Bakker5121ce52009-01-03 21:22:43 +00001885 */
Paul Bakkerca9c87e2013-09-25 18:52:37 +02001886 size_t pad_count = 0, real_count = 1;
Angus Gratton1226dd72018-06-19 15:57:50 +10001887 size_t padding_idx = ssl->in_msglen - padlen;
Paul Bakkere47b34b2013-02-27 14:48:00 +01001888
Paul Bakker956c9e02013-12-19 14:42:28 +01001889 /*
1890 * Padding is guaranteed to be incorrect if:
Angus Gratton1226dd72018-06-19 15:57:50 +10001891 * 1. padlen > ssl->in_msglen
Paul Bakker956c9e02013-12-19 14:42:28 +01001892 *
Angus Gratton1226dd72018-06-19 15:57:50 +10001893 * 2. padding_idx > MBEDTLS_SSL_MAX_CONTENT_LEN +
Paul Bakker61885c72014-04-25 12:59:03 +02001894 * ssl->transform_in->maclen
Paul Bakker956c9e02013-12-19 14:42:28 +01001895 *
1896 * In both cases we reset padding_idx to a safe value (0) to
1897 * prevent out-of-buffer reads.
1898 */
Angus Gratton1226dd72018-06-19 15:57:50 +10001899 correct &= ( padlen <= ssl->in_msglen );
1900 correct &= ( padding_idx <= MBEDTLS_SSL_MAX_CONTENT_LEN +
Paul Bakker61885c72014-04-25 12:59:03 +02001901 ssl->transform_in->maclen );
Paul Bakker956c9e02013-12-19 14:42:28 +01001902
1903 padding_idx *= correct;
1904
Angus Gratton1226dd72018-06-19 15:57:50 +10001905 for( i = 0; i < 256; i++ )
Paul Bakkerca9c87e2013-09-25 18:52:37 +02001906 {
Angus Gratton1226dd72018-06-19 15:57:50 +10001907 real_count &= ( i < padlen );
Paul Bakkerca9c87e2013-09-25 18:52:37 +02001908 pad_count += real_count *
1909 ( ssl->in_msg[padding_idx + i] == padlen - 1 );
1910 }
Paul Bakkere47b34b2013-02-27 14:48:00 +01001911
1912 correct &= ( pad_count == padlen ); /* Only 1 on correct padding */
Paul Bakkere47b34b2013-02-27 14:48:00 +01001913
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001914#if defined(MBEDTLS_SSL_DEBUG_ALL)
Paul Bakker66d5d072014-06-17 16:39:18 +02001915 if( padlen > 0 && correct == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001916 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) );
Paul Bakkerd66f0702013-01-31 16:57:45 +01001917#endif
Paul Bakkere47b34b2013-02-27 14:48:00 +01001918 padlen &= correct * 0x1FF;
Paul Bakker5121ce52009-01-03 21:22:43 +00001919 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +02001920 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001921#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
1922 MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker577e0062013-08-28 11:57:20 +02001923 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001924 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1925 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker577e0062013-08-28 11:57:20 +02001926 }
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001927
1928 ssl->in_msglen -= padlen;
Paul Bakker5121ce52009-01-03 21:22:43 +00001929 }
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001930 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001931#endif /* MBEDTLS_CIPHER_MODE_CBC &&
1932 ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001933 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001934 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1935 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardf7dc3782013-09-13 14:10:44 +02001936 }
Paul Bakker5121ce52009-01-03 21:22:43 +00001937
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001938 MBEDTLS_SSL_DEBUG_BUF( 4, "raw buffer after decryption",
Paul Bakker5121ce52009-01-03 21:22:43 +00001939 ssl->in_msg, ssl->in_msglen );
1940
1941 /*
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001942 * Authenticate if not done yet.
1943 * Compute the MAC regardless of the padding result (RFC4346, CBCTIME).
Paul Bakker5121ce52009-01-03 21:22:43 +00001944 */
Manuel Pégourié-Gonnard8408a942015-04-09 12:14:31 +02001945#if defined(SSL_SOME_MODES_USE_MAC)
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01001946 if( auth_done == 0 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001947 {
Hanno Beckerce516ff2017-11-09 18:57:39 +00001948 unsigned char mac_expect[MBEDTLS_SSL_MAC_ADD];
Paul Bakker1e5369c2013-12-19 16:40:57 +01001949
Manuel Pégourié-Gonnard313d7962014-10-29 12:07:57 +01001950 ssl->in_msglen -= ssl->transform_in->maclen;
Paul Bakker5121ce52009-01-03 21:22:43 +00001951
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01001952 ssl->in_len[0] = (unsigned char)( ssl->in_msglen >> 8 );
1953 ssl->in_len[1] = (unsigned char)( ssl->in_msglen );
Paul Bakker5121ce52009-01-03 21:22:43 +00001954
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001955#if defined(MBEDTLS_SSL_PROTO_SSL3)
1956 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001957 {
1958 ssl_mac( &ssl->transform_in->md_ctx_dec,
1959 ssl->transform_in->mac_dec,
1960 ssl->in_msg, ssl->in_msglen,
Manuel Pégourié-Gonnardb67a5c12017-12-18 18:04:59 +01001961 ssl->in_ctr, ssl->in_msgtype,
1962 mac_expect );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001963 }
1964 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001965#endif /* MBEDTLS_SSL_PROTO_SSL3 */
1966#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1967 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1968 if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001969 {
1970 /*
1971 * Process MAC and always update for padlen afterwards to make
1972 * total time independent of padlen
1973 *
Paul Bakker9af723c2014-05-01 13:03:14 +02001974 * extra_run compensates MAC check for padlen
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001975 *
1976 * Known timing attacks:
1977 * - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf)
1978 *
1979 * We use ( ( Lx + 8 ) / 64 ) to handle 'negative Lx' values
1980 * correctly. (We round down instead of up, so -56 is the correct
1981 * value for our calculations instead of -55)
1982 */
1983 size_t j, extra_run = 0;
1984 extra_run = ( 13 + ssl->in_msglen + padlen + 8 ) / 64 -
1985 ( 13 + ssl->in_msglen + 8 ) / 64;
Paul Bakkere47b34b2013-02-27 14:48:00 +01001986
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001987 extra_run &= correct * 0xFF;
Paul Bakkere47b34b2013-02-27 14:48:00 +01001988
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001989 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_ctr, 8 );
1990 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_hdr, 3 );
1991 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_len, 2 );
1992 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_msg,
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02001993 ssl->in_msglen );
Hanno Beckerce516ff2017-11-09 18:57:39 +00001994 mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, mac_expect );
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02001995 /* Call mbedtls_md_process at least once due to cache attacks */
Manuel Pégourié-Gonnard47fede02015-04-29 01:35:48 +02001996 for( j = 0; j < extra_run + 1; j++ )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001997 mbedtls_md_process( &ssl->transform_in->md_ctx_dec, ssl->in_msg );
Paul Bakkere47b34b2013-02-27 14:48:00 +01001998
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02001999 mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02002000 }
2001 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002002#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
2003 MBEDTLS_SSL_PROTO_TLS1_2 */
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02002004 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002005 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2006 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02002007 }
Paul Bakker5121ce52009-01-03 21:22:43 +00002008
Hanno Beckerce516ff2017-11-09 18:57:39 +00002009 MBEDTLS_SSL_DEBUG_BUF( 4, "expected mac", mac_expect, ssl->transform_in->maclen );
2010 MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_msg + ssl->in_msglen,
2011 ssl->transform_in->maclen );
Paul Bakker5121ce52009-01-03 21:22:43 +00002012
Hanno Beckerce516ff2017-11-09 18:57:39 +00002013 if( mbedtls_ssl_safer_memcmp( ssl->in_msg + ssl->in_msglen, mac_expect,
2014 ssl->transform_in->maclen ) != 0 )
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02002015 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002016#if defined(MBEDTLS_SSL_DEBUG_ALL)
2017 MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
Paul Bakkere47b34b2013-02-27 14:48:00 +01002018#endif
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02002019 correct = 0;
2020 }
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01002021 auth_done++;
Paul Bakker5121ce52009-01-03 21:22:43 +00002022
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02002023 /*
2024 * Finally check the correct flag
2025 */
2026 if( correct == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002027 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnard71096242013-10-25 19:31:25 +02002028 }
Manuel Pégourié-Gonnard8408a942015-04-09 12:14:31 +02002029#endif /* SSL_SOME_MODES_USE_MAC */
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01002030
2031 /* Make extra sure authentication was performed, exactly once */
2032 if( auth_done != 1 )
2033 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002034 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2035 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard352143f2015-01-13 10:59:51 +01002036 }
Paul Bakker5121ce52009-01-03 21:22:43 +00002037
2038 if( ssl->in_msglen == 0 )
2039 {
Angus Gratton485b3932018-06-19 15:58:22 +10002040#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
2041 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3
2042 && ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
2043 {
2044 /* TLS v1.2 explicitly disallows zero-length messages which are not application data */
2045 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid zero-length message type: %d", ssl->in_msgtype ) );
2046 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
2047 }
2048#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
2049
Paul Bakker5121ce52009-01-03 21:22:43 +00002050 ssl->nb_zero++;
2051
2052 /*
2053 * Three or more empty messages may be a DoS attack
2054 * (excessive CPU consumption).
2055 */
2056 if( ssl->nb_zero > 3 )
2057 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002058 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty "
Paul Bakker5121ce52009-01-03 21:22:43 +00002059 "messages, possible DoS attack" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002060 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Paul Bakker5121ce52009-01-03 21:22:43 +00002061 }
2062 }
2063 else
2064 ssl->nb_zero = 0;
Paul Bakkerf7abd422013-04-16 13:15:56 +02002065
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002066#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002067 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +01002068 {
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02002069 ; /* in_ctr read from peer, not maintained internally */
Manuel Pégourié-Gonnardea22ce52014-09-24 09:46:10 +02002070 }
2071 else
2072#endif
2073 {
2074 for( i = 8; i > ssl_ep_len( ssl ); i-- )
2075 if( ++ssl->in_ctr[i - 1] != 0 )
2076 break;
2077
2078 /* The loop goes to its end iff the counter is wrapping */
2079 if( i == ssl_ep_len( ssl ) )
2080 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002081 MBEDTLS_SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) );
2082 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
Manuel Pégourié-Gonnardea22ce52014-09-24 09:46:10 +02002083 }
Manuel Pégourié-Gonnard83cdffc2014-03-10 21:20:29 +01002084 }
2085
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002086 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002087
2088 return( 0 );
2089}
2090
Manuel Pégourié-Gonnard0098e7d2014-10-28 13:08:59 +01002091#undef MAC_NONE
2092#undef MAC_PLAINTEXT
2093#undef MAC_CIPHERTEXT
2094
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002095#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker2770fbd2012-07-03 13:30:23 +00002096/*
2097 * Compression/decompression functions
2098 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002099static int ssl_compress_buf( mbedtls_ssl_context *ssl )
Paul Bakker2770fbd2012-07-03 13:30:23 +00002100{
2101 int ret;
2102 unsigned char *msg_post = ssl->out_msg;
Andrzej Kurekbb666142018-04-23 08:29:36 -04002103 ptrdiff_t bytes_written = ssl->out_msg - ssl->out_buf;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002104 size_t len_pre = ssl->out_msglen;
Paul Bakker16770332013-10-11 09:59:44 +02002105 unsigned char *msg_pre = ssl->compress_buf;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002106
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002107 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> compress buf" ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002108
Paul Bakkerabf2f8f2013-06-30 14:57:46 +02002109 if( len_pre == 0 )
2110 return( 0 );
2111
Paul Bakker2770fbd2012-07-03 13:30:23 +00002112 memcpy( msg_pre, ssl->out_msg, len_pre );
2113
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002114 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002115 ssl->out_msglen ) );
2116
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002117 MBEDTLS_SSL_DEBUG_BUF( 4, "before compression: output payload",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002118 ssl->out_msg, ssl->out_msglen );
2119
Paul Bakker48916f92012-09-16 19:57:18 +00002120 ssl->transform_out->ctx_deflate.next_in = msg_pre;
2121 ssl->transform_out->ctx_deflate.avail_in = len_pre;
2122 ssl->transform_out->ctx_deflate.next_out = msg_post;
Andrzej Kurekbb666142018-04-23 08:29:36 -04002123 ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_BUFFER_LEN - bytes_written;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002124
Paul Bakker48916f92012-09-16 19:57:18 +00002125 ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002126 if( ret != Z_OK )
2127 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002128 MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) );
2129 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002130 }
2131
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002132 ssl->out_msglen = MBEDTLS_SSL_BUFFER_LEN -
Andrzej Kurekbb666142018-04-23 08:29:36 -04002133 ssl->transform_out->ctx_deflate.avail_out - bytes_written;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002134
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002135 MBEDTLS_SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002136 ssl->out_msglen ) );
2137
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002138 MBEDTLS_SSL_DEBUG_BUF( 4, "after compression: output payload",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002139 ssl->out_msg, ssl->out_msglen );
2140
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002141 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= compress buf" ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002142
2143 return( 0 );
2144}
2145
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002146static int ssl_decompress_buf( mbedtls_ssl_context *ssl )
Paul Bakker2770fbd2012-07-03 13:30:23 +00002147{
2148 int ret;
2149 unsigned char *msg_post = ssl->in_msg;
Andrzej Kurek078014a2018-04-24 06:32:44 -04002150 ptrdiff_t header_bytes = ssl->in_msg - ssl->in_buf;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002151 size_t len_pre = ssl->in_msglen;
Paul Bakker16770332013-10-11 09:59:44 +02002152 unsigned char *msg_pre = ssl->compress_buf;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002153
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002154 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002155
Paul Bakkerabf2f8f2013-06-30 14:57:46 +02002156 if( len_pre == 0 )
2157 return( 0 );
2158
Paul Bakker2770fbd2012-07-03 13:30:23 +00002159 memcpy( msg_pre, ssl->in_msg, len_pre );
2160
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002161 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002162 ssl->in_msglen ) );
2163
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002164 MBEDTLS_SSL_DEBUG_BUF( 4, "before decompression: input payload",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002165 ssl->in_msg, ssl->in_msglen );
2166
Paul Bakker48916f92012-09-16 19:57:18 +00002167 ssl->transform_in->ctx_inflate.next_in = msg_pre;
2168 ssl->transform_in->ctx_inflate.avail_in = len_pre;
2169 ssl->transform_in->ctx_inflate.next_out = msg_post;
Andrzej Kurekbb666142018-04-23 08:29:36 -04002170 ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_BUFFER_LEN -
Andrzej Kurek078014a2018-04-24 06:32:44 -04002171 header_bytes;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002172
Paul Bakker48916f92012-09-16 19:57:18 +00002173 ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002174 if( ret != Z_OK )
2175 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002176 MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) );
2177 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002178 }
2179
Andrzej Kurekbb666142018-04-23 08:29:36 -04002180 ssl->in_msglen = MBEDTLS_SSL_BUFFER_LEN -
Andrzej Kurek078014a2018-04-24 06:32:44 -04002181 ssl->transform_in->ctx_inflate.avail_out - header_bytes;
Paul Bakker2770fbd2012-07-03 13:30:23 +00002182
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002183 MBEDTLS_SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002184 ssl->in_msglen ) );
2185
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002186 MBEDTLS_SSL_DEBUG_BUF( 4, "after decompression: input payload",
Paul Bakker2770fbd2012-07-03 13:30:23 +00002187 ssl->in_msg, ssl->in_msglen );
2188
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002189 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002190
2191 return( 0 );
2192}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002193#endif /* MBEDTLS_ZLIB_SUPPORT */
Paul Bakker2770fbd2012-07-03 13:30:23 +00002194
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002195#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
2196static int ssl_write_hello_request( mbedtls_ssl_context *ssl );
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002197
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002198#if defined(MBEDTLS_SSL_PROTO_DTLS)
2199static int ssl_resend_hello_request( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002200{
2201 /* If renegotiation is not enforced, retransmit until we would reach max
2202 * timeout if we were using the usual handshake doubling scheme */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002203 if( ssl->conf->renego_max_records < 0 )
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002204 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002205 uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1;
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002206 unsigned char doublings = 1;
2207
2208 while( ratio != 0 )
2209 {
2210 ++doublings;
2211 ratio >>= 1;
2212 }
2213
2214 if( ++ssl->renego_records_seen > doublings )
2215 {
Manuel Pégourié-Gonnardcb0d2122015-07-22 11:52:11 +02002216 MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) );
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002217 return( 0 );
2218 }
2219 }
2220
2221 return( ssl_write_hello_request( ssl ) );
2222}
2223#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002224#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02002225
Paul Bakker5121ce52009-01-03 21:22:43 +00002226/*
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002227 * Fill the input message buffer by appending data to it.
2228 * The amount of data already fetched is in ssl->in_left.
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002229 *
2230 * If we return 0, is it guaranteed that (at least) nb_want bytes are
2231 * available (from this read and/or a previous one). Otherwise, an error code
2232 * is returned (possibly EOF or WANT_READ).
2233 *
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002234 * With stream transport (TLS) on success ssl->in_left == nb_want, but
2235 * with datagram transport (DTLS) on success ssl->in_left >= nb_want,
2236 * since we always read a whole datagram at once.
2237 *
Manuel Pégourié-Gonnard64dffc52014-09-02 13:39:16 +02002238 * For DTLS, it is up to the caller to set ssl->next_record_offset when
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002239 * they're done reading a record.
Paul Bakker5121ce52009-01-03 21:22:43 +00002240 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002241int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want )
Paul Bakker5121ce52009-01-03 21:22:43 +00002242{
Paul Bakker23986e52011-04-24 08:57:21 +00002243 int ret;
2244 size_t len;
Paul Bakker5121ce52009-01-03 21:22:43 +00002245
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002246 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> fetch input" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002247
Manuel Pégourié-Gonnarde6bdc442014-09-17 11:34:57 +02002248 if( ssl->f_recv == NULL && ssl->f_recv_timeout == NULL )
2249 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002250 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
Manuel Pégourié-Gonnard1b511f92015-05-06 15:54:23 +01002251 "or mbedtls_ssl_set_bio()" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002252 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnarde6bdc442014-09-17 11:34:57 +02002253 }
2254
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002255 if( nb_want > MBEDTLS_SSL_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) )
Paul Bakker1a1fbba2014-04-30 14:38:05 +02002256 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002257 MBEDTLS_SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) );
2258 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker1a1fbba2014-04-30 14:38:05 +02002259 }
2260
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002261#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002262 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Paul Bakker5121ce52009-01-03 21:22:43 +00002263 {
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002264 uint32_t timeout;
2265
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +02002266 /* Just to be sure */
2267 if( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL )
2268 {
2269 MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use "
2270 "mbedtls_ssl_set_timer_cb() for DTLS" ) );
2271 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2272 }
2273
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002274 /*
2275 * The point is, we need to always read a full datagram at once, so we
2276 * sometimes read more then requested, and handle the additional data.
2277 * It could be the rest of the current record (while fetching the
2278 * header) and/or some other records in the same datagram.
2279 */
2280
2281 /*
2282 * Move to the next record in the already read datagram if applicable
2283 */
2284 if( ssl->next_record_offset != 0 )
2285 {
2286 if( ssl->in_left < ssl->next_record_offset )
2287 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002288 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2289 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002290 }
2291
2292 ssl->in_left -= ssl->next_record_offset;
2293
2294 if( ssl->in_left != 0 )
2295 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002296 MBEDTLS_SSL_DEBUG_MSG( 2, ( "next record in same datagram, offset: %d",
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002297 ssl->next_record_offset ) );
2298 memmove( ssl->in_hdr,
2299 ssl->in_hdr + ssl->next_record_offset,
2300 ssl->in_left );
2301 }
2302
2303 ssl->next_record_offset = 0;
2304 }
2305
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002306 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
Paul Bakker5121ce52009-01-03 21:22:43 +00002307 ssl->in_left, nb_want ) );
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002308
2309 /*
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002310 * Done if we already have enough data.
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002311 */
2312 if( nb_want <= ssl->in_left)
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002313 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002314 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002315 return( 0 );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002316 }
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002317
2318 /*
2319 * A record can't be split accross datagrams. If we need to read but
2320 * are not at the beginning of a new record, the caller did something
2321 * wrong.
2322 */
2323 if( ssl->in_left != 0 )
2324 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002325 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2326 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002327 }
2328
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002329 /*
2330 * Don't even try to read if time's out already.
2331 * This avoids by-passing the timer when repeatedly receiving messages
2332 * that will end up being dropped.
2333 */
2334 if( ssl_check_timer( ssl ) != 0 )
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01002335 ret = MBEDTLS_ERR_SSL_TIMEOUT;
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002336 else
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02002337 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002338 len = MBEDTLS_SSL_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf );
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002339
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002340 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002341 timeout = ssl->handshake->retransmit_timeout;
2342 else
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002343 timeout = ssl->conf->read_timeout;
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002344
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002345 MBEDTLS_SSL_DEBUG_MSG( 3, ( "f_recv_timeout: %u ms", timeout ) );
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002346
Manuel Pégourié-Gonnard07617332015-06-24 23:00:03 +02002347 if( ssl->f_recv_timeout != NULL )
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002348 ret = ssl->f_recv_timeout( ssl->p_bio, ssl->in_hdr, len,
2349 timeout );
2350 else
2351 ret = ssl->f_recv( ssl->p_bio, ssl->in_hdr, len );
2352
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002353 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002354
2355 if( ret == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002356 return( MBEDTLS_ERR_SSL_CONN_EOF );
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002357 }
2358
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01002359 if( ret == MBEDTLS_ERR_SSL_TIMEOUT )
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002360 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002361 MBEDTLS_SSL_DEBUG_MSG( 2, ( "timeout" ) );
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002362 ssl_set_timer( ssl, 0 );
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02002363
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002364 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +02002365 {
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002366 if( ssl_double_retransmit_timeout( ssl ) != 0 )
2367 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002368 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake timeout" ) );
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01002369 return( MBEDTLS_ERR_SSL_TIMEOUT );
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002370 }
2371
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002372 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002373 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002374 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02002375 return( ret );
2376 }
2377
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01002378 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +02002379 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002380#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002381 else if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002382 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02002383 {
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02002384 if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02002385 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002386 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02002387 return( ret );
2388 }
2389
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01002390 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02002391 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002392#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02002393 }
2394
Paul Bakker5121ce52009-01-03 21:22:43 +00002395 if( ret < 0 )
2396 return( ret );
2397
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002398 ssl->in_left = ret;
2399 }
2400 else
2401#endif
2402 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002403 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02002404 ssl->in_left, nb_want ) );
2405
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002406 while( ssl->in_left < nb_want )
2407 {
2408 len = nb_want - ssl->in_left;
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +02002409
2410 if( ssl_check_timer( ssl ) != 0 )
2411 ret = MBEDTLS_ERR_SSL_TIMEOUT;
2412 else
Manuel Pégourié-Gonnard07617332015-06-24 23:00:03 +02002413 {
2414 if( ssl->f_recv_timeout != NULL )
2415 {
2416 ret = ssl->f_recv_timeout( ssl->p_bio,
2417 ssl->in_hdr + ssl->in_left, len,
2418 ssl->conf->read_timeout );
2419 }
2420 else
2421 {
2422 ret = ssl->f_recv( ssl->p_bio,
2423 ssl->in_hdr + ssl->in_left, len );
2424 }
2425 }
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002426
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002427 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
Manuel Pégourié-Gonnard07617332015-06-24 23:00:03 +02002428 ssl->in_left, nb_want ) );
2429 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002430
2431 if( ret == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002432 return( MBEDTLS_ERR_SSL_CONN_EOF );
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002433
2434 if( ret < 0 )
2435 return( ret );
2436
mohammad1603f72e51f2018-03-28 23:44:39 -07002437 if ( (size_t)ret > len || ( INT_MAX > SIZE_MAX && ret > SIZE_MAX ) )
mohammad160389c12ec2018-03-19 07:15:50 -07002438 {
Jaeden Ameroee6c8222018-04-03 12:07:19 +01002439 MBEDTLS_SSL_DEBUG_MSG( 1,
2440 ( "f_recv returned %d bytes but only %lu were requested",
mohammad1603ad2908c2018-04-02 07:30:32 -07002441 ret, (unsigned long)len ) );
mohammad160389c12ec2018-03-19 07:15:50 -07002442 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2443 }
2444
Manuel Pégourié-Gonnardfe98ace2014-03-24 13:13:01 +01002445 ssl->in_left += ret;
2446 }
Paul Bakker5121ce52009-01-03 21:22:43 +00002447 }
2448
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002449 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002450
2451 return( 0 );
2452}
2453
2454/*
2455 * Flush any data not yet written
2456 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002457int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00002458{
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +01002459 int ret;
2460 unsigned char *buf, i;
Paul Bakker5121ce52009-01-03 21:22:43 +00002461
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002462 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> flush output" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002463
Manuel Pégourié-Gonnarde6bdc442014-09-17 11:34:57 +02002464 if( ssl->f_send == NULL )
2465 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002466 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
Manuel Pégourié-Gonnard1b511f92015-05-06 15:54:23 +01002467 "or mbedtls_ssl_set_bio()" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002468 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnarde6bdc442014-09-17 11:34:57 +02002469 }
2470
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002471 /* Avoid incrementing counter if data is flushed */
2472 if( ssl->out_left == 0 )
2473 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002474 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002475 return( 0 );
2476 }
2477
Paul Bakker5121ce52009-01-03 21:22:43 +00002478 while( ssl->out_left > 0 )
2479 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002480 MBEDTLS_SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d",
2481 mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen, ssl->out_left ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002482
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002483 buf = ssl->out_hdr + mbedtls_ssl_hdr_len( ssl ) +
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002484 ssl->out_msglen - ssl->out_left;
Manuel Pégourié-Gonnarde6bdc442014-09-17 11:34:57 +02002485 ret = ssl->f_send( ssl->p_bio, buf, ssl->out_left );
Paul Bakker186751d2012-05-08 13:16:14 +00002486
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002487 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_send", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00002488
2489 if( ret <= 0 )
2490 return( ret );
2491
mohammad1603f72e51f2018-03-28 23:44:39 -07002492 if( (size_t)ret > ssl->out_left || ( INT_MAX > SIZE_MAX && ret > SIZE_MAX ) )
mohammad1603f65add42018-02-22 04:29:04 -08002493 {
Jaeden Ameroee6c8222018-04-03 12:07:19 +01002494 MBEDTLS_SSL_DEBUG_MSG( 1,
2495 ( "f_send returned %d bytes but only %lu bytes were sent",
mohammad1603ad2908c2018-04-02 07:30:32 -07002496 ret, (unsigned long)ssl->out_left ) );
mohammad1603f65add42018-02-22 04:29:04 -08002497 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2498 }
2499
Paul Bakker5121ce52009-01-03 21:22:43 +00002500 ssl->out_left -= ret;
2501 }
2502
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +01002503 for( i = 8; i > ssl_ep_len( ssl ); i-- )
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002504 if( ++ssl->out_ctr[i - 1] != 0 )
2505 break;
2506
2507 /* The loop goes to its end iff the counter is wrapping */
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +01002508 if( i == ssl_ep_len( ssl ) )
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002509 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002510 MBEDTLS_SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) );
2511 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01002512 }
2513
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002514 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002515
2516 return( 0 );
2517}
2518
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002519/*
2520 * Functions to handle the DTLS retransmission state machine
2521 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002522#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002523/*
2524 * Append current handshake message to current outgoing flight
2525 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002526static int ssl_flight_append( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002527{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002528 mbedtls_ssl_flight_item *msg;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002529
2530 /* Allocate space for current message */
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02002531 if( ( msg = mbedtls_calloc( 1, sizeof( mbedtls_ssl_flight_item ) ) ) == NULL )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002532 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02002533 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed",
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002534 sizeof( mbedtls_ssl_flight_item ) ) );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02002535 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002536 }
2537
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02002538 if( ( msg->p = mbedtls_calloc( 1, ssl->out_msglen ) ) == NULL )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002539 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02002540 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", ssl->out_msglen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002541 mbedtls_free( msg );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02002542 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002543 }
2544
2545 /* Copy current handshake message with headers */
2546 memcpy( msg->p, ssl->out_msg, ssl->out_msglen );
2547 msg->len = ssl->out_msglen;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002548 msg->type = ssl->out_msgtype;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002549 msg->next = NULL;
2550
2551 /* Append to the current flight */
2552 if( ssl->handshake->flight == NULL )
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002553 ssl->handshake->flight = msg;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002554 else
2555 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002556 mbedtls_ssl_flight_item *cur = ssl->handshake->flight;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002557 while( cur->next != NULL )
2558 cur = cur->next;
2559 cur->next = msg;
2560 }
2561
2562 return( 0 );
2563}
2564
2565/*
2566 * Free the current flight of handshake messages
2567 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002568static void ssl_flight_free( mbedtls_ssl_flight_item *flight )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002569{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002570 mbedtls_ssl_flight_item *cur = flight;
2571 mbedtls_ssl_flight_item *next;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002572
2573 while( cur != NULL )
2574 {
2575 next = cur->next;
2576
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002577 mbedtls_free( cur->p );
2578 mbedtls_free( cur );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002579
2580 cur = next;
2581 }
2582}
2583
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002584#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
2585static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl );
Manuel Pégourié-Gonnardb47368a2014-09-24 13:29:58 +02002586#endif
2587
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002588/*
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002589 * Swap transform_out and out_ctr with the alternative ones
2590 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002591static void ssl_swap_epochs( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002592{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002593 mbedtls_ssl_transform *tmp_transform;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002594 unsigned char tmp_out_ctr[8];
2595
2596 if( ssl->transform_out == ssl->handshake->alt_transform_out )
2597 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002598 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip swap epochs" ) );
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002599 return;
2600 }
2601
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002602 MBEDTLS_SSL_DEBUG_MSG( 3, ( "swap epochs" ) );
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002603
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002604 /* Swap transforms */
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002605 tmp_transform = ssl->transform_out;
2606 ssl->transform_out = ssl->handshake->alt_transform_out;
2607 ssl->handshake->alt_transform_out = tmp_transform;
2608
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002609 /* Swap epoch + sequence_number */
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002610 memcpy( tmp_out_ctr, ssl->out_ctr, 8 );
2611 memcpy( ssl->out_ctr, ssl->handshake->alt_out_ctr, 8 );
2612 memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 );
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002613
2614 /* Adjust to the newly activated transform */
2615 if( ssl->transform_out != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002616 ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002617 {
2618 ssl->out_msg = ssl->out_iv + ssl->transform_out->ivlen -
2619 ssl->transform_out->fixed_ivlen;
2620 }
2621 else
2622 ssl->out_msg = ssl->out_iv;
2623
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002624#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
2625 if( mbedtls_ssl_hw_record_activate != NULL )
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002626 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002627 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002628 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002629 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
2630 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002631 }
2632 }
2633#endif
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002634}
2635
2636/*
2637 * Retransmit the current flight of messages.
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002638 *
2639 * Need to remember the current message in case flush_output returns
2640 * WANT_WRITE, causing us to exit this function and come back later.
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002641 * This function must be called until state is no longer SENDING.
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002642 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002643int mbedtls_ssl_resend( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002644{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002645 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_resend" ) );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002646
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002647 if( ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING )
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002648 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002649 MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialise resending" ) );
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002650
2651 ssl->handshake->cur_msg = ssl->handshake->flight;
2652 ssl_swap_epochs( ssl );
2653
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002654 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_SENDING;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002655 }
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002656
2657 while( ssl->handshake->cur_msg != NULL )
2658 {
2659 int ret;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002660 mbedtls_ssl_flight_item *cur = ssl->handshake->cur_msg;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002661
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002662 /* Swap epochs before sending Finished: we can't do it after
2663 * sending ChangeCipherSpec, in case write returns WANT_READ.
2664 * Must be done before copying, may change out_msg pointer */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002665 if( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE &&
2666 cur->p[0] == MBEDTLS_SSL_HS_FINISHED )
Manuel Pégourié-Gonnardc715aed2014-09-19 21:39:13 +02002667 {
2668 ssl_swap_epochs( ssl );
2669 }
2670
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002671 memcpy( ssl->out_msg, cur->p, cur->len );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002672 ssl->out_msglen = cur->len;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002673 ssl->out_msgtype = cur->type;
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002674
2675 ssl->handshake->cur_msg = cur->next;
2676
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002677 MBEDTLS_SSL_DEBUG_BUF( 3, "resent handshake message header", ssl->out_msg, 12 );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002678
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002679 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002680 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002681 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002682 return( ret );
2683 }
2684 }
2685
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002686 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
2687 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
Manuel Pégourié-Gonnard23b7b702014-09-25 13:50:12 +02002688 else
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002689 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002690 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
Manuel Pégourié-Gonnard4e2f2452014-10-02 16:51:56 +02002691 ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
2692 }
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002693
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002694 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_resend" ) );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002695
2696 return( 0 );
2697}
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002698
2699/*
2700 * To be called when the last message of an incoming flight is received.
2701 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002702void mbedtls_ssl_recv_flight_completed( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002703{
2704 /* We won't need to resend that one any more */
2705 ssl_flight_free( ssl->handshake->flight );
2706 ssl->handshake->flight = NULL;
2707 ssl->handshake->cur_msg = NULL;
2708
2709 /* The next incoming flight will start with this msg_seq */
2710 ssl->handshake->in_flight_start_seq = ssl->handshake->in_msg_seq;
2711
Manuel Pégourié-Gonnard6c1fa3a2014-10-01 16:58:16 +02002712 /* Cancel timer */
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002713 ssl_set_timer( ssl, 0 );
2714
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002715 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
2716 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002717 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002718 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002719 }
2720 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002721 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02002722}
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002723
2724/*
2725 * To be called when the last message of an outgoing flight is send.
2726 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002727void mbedtls_ssl_send_flight_completed( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002728{
Manuel Pégourié-Gonnard6c1fa3a2014-10-01 16:58:16 +02002729 ssl_reset_retransmit_timeout( ssl );
Manuel Pégourié-Gonnard0ac247f2014-09-30 22:21:31 +02002730 ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002731
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002732 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
2733 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002734 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002735 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002736 }
2737 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002738 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02002739}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002740#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002741
Paul Bakker5121ce52009-01-03 21:22:43 +00002742/*
2743 * Record layer functions
2744 */
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002745
2746/*
2747 * Write current record.
2748 * Uses ssl->out_msgtype, ssl->out_msglen and bytes at ssl->out_msg.
2749 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002750int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00002751{
Paul Bakker05ef8352012-05-08 09:17:57 +00002752 int ret, done = 0;
Paul Bakker23986e52011-04-24 08:57:21 +00002753 size_t len = ssl->out_msglen;
Paul Bakker5121ce52009-01-03 21:22:43 +00002754
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002755 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write record" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002756
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002757#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002758 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002759 ssl->handshake != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002760 ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002761 {
2762 ; /* Skip special handshake treatment when resending */
2763 }
2764 else
2765#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002766 if( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker5121ce52009-01-03 21:22:43 +00002767 {
Manuel Pégourié-Gonnard14bf7062015-06-23 14:07:13 +02002768 if( ssl->out_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST &&
2769 ssl->handshake == NULL )
2770 {
2771 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2772 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2773 }
2774
Paul Bakker5121ce52009-01-03 21:22:43 +00002775 ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 );
2776 ssl->out_msg[2] = (unsigned char)( ( len - 4 ) >> 8 );
2777 ssl->out_msg[3] = (unsigned char)( ( len - 4 ) );
2778
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01002779 /*
2780 * DTLS has additional fields in the Handshake layer,
2781 * between the length field and the actual payload:
2782 * uint16 message_seq;
2783 * uint24 fragment_offset;
2784 * uint24 fragment_length;
2785 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002786#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002787 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01002788 {
Manuel Pégourié-Gonnarde89bcf02014-02-18 18:50:02 +01002789 /* Make room for the additional DTLS fields */
Hanno Becker0983dc42017-09-18 10:55:54 +01002790 if( MBEDTLS_SSL_MAX_CONTENT_LEN - ssl->out_msglen < 8 )
2791 {
2792 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS handshake message too large: "
2793 "size %u, maximum %u",
2794 (unsigned) ( ssl->in_hslen - 4 ),
2795 (unsigned) ( MBEDTLS_SSL_MAX_CONTENT_LEN - 12 ) ) );
2796 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2797 }
2798
Manuel Pégourié-Gonnarde89bcf02014-02-18 18:50:02 +01002799 memmove( ssl->out_msg + 12, ssl->out_msg + 4, len - 4 );
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01002800 ssl->out_msglen += 8;
2801 len += 8;
2802
Manuel Pégourié-Gonnardc392b242014-08-19 17:53:11 +02002803 /* Write message_seq and update it, except for HelloRequest */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002804 if( ssl->out_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST )
Manuel Pégourié-Gonnardc392b242014-08-19 17:53:11 +02002805 {
Manuel Pégourié-Gonnardd9ba0d92014-09-02 18:30:26 +02002806 ssl->out_msg[4] = ( ssl->handshake->out_msg_seq >> 8 ) & 0xFF;
2807 ssl->out_msg[5] = ( ssl->handshake->out_msg_seq ) & 0xFF;
2808 ++( ssl->handshake->out_msg_seq );
Manuel Pégourié-Gonnardc392b242014-08-19 17:53:11 +02002809 }
2810 else
2811 {
2812 ssl->out_msg[4] = 0;
2813 ssl->out_msg[5] = 0;
2814 }
Manuel Pégourié-Gonnarde89bcf02014-02-18 18:50:02 +01002815
2816 /* We don't fragment, so frag_offset = 0 and frag_len = len */
2817 memset( ssl->out_msg + 6, 0x00, 3 );
2818 memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 );
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01002819 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002820#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01002821
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002822 if( ssl->out_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST )
Manuel Pégourié-Gonnardf3dc2f62013-10-29 18:17:41 +01002823 ssl->handshake->update_checksum( ssl, ssl->out_msg, len );
Paul Bakker5121ce52009-01-03 21:22:43 +00002824 }
2825
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002826 /* Save handshake and CCS messages for resending */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002827#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002828 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002829 ssl->handshake != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002830 ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING &&
2831 ( ssl->out_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ||
2832 ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) )
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002833 {
2834 if( ( ret = ssl_flight_append( ssl ) ) != 0 )
2835 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002836 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_flight_append", ret );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02002837 return( ret );
2838 }
2839 }
2840#endif
2841
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002842#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker48916f92012-09-16 19:57:18 +00002843 if( ssl->transform_out != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002844 ssl->session_out->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
Paul Bakker2770fbd2012-07-03 13:30:23 +00002845 {
2846 if( ( ret = ssl_compress_buf( ssl ) ) != 0 )
2847 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002848 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compress_buf", ret );
Paul Bakker2770fbd2012-07-03 13:30:23 +00002849 return( ret );
2850 }
2851
2852 len = ssl->out_msglen;
2853 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002854#endif /*MBEDTLS_ZLIB_SUPPORT */
Paul Bakker2770fbd2012-07-03 13:30:23 +00002855
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002856#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
2857 if( mbedtls_ssl_hw_record_write != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00002858 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002859 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_write()" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002860
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002861 ret = mbedtls_ssl_hw_record_write( ssl );
2862 if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
Paul Bakker05ef8352012-05-08 09:17:57 +00002863 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002864 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_write", ret );
2865 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Paul Bakker05ef8352012-05-08 09:17:57 +00002866 }
Paul Bakkerc7878112012-12-19 14:41:14 +01002867
2868 if( ret == 0 )
2869 done = 1;
Paul Bakker05ef8352012-05-08 09:17:57 +00002870 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002871#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
Paul Bakker05ef8352012-05-08 09:17:57 +00002872 if( !done )
2873 {
2874 ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002875 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02002876 ssl->conf->transport, ssl->out_hdr + 1 );
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01002877
2878 ssl->out_len[0] = (unsigned char)( len >> 8 );
2879 ssl->out_len[1] = (unsigned char)( len );
Paul Bakker05ef8352012-05-08 09:17:57 +00002880
Paul Bakker48916f92012-09-16 19:57:18 +00002881 if( ssl->transform_out != NULL )
Paul Bakker05ef8352012-05-08 09:17:57 +00002882 {
2883 if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 )
2884 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002885 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret );
Paul Bakker05ef8352012-05-08 09:17:57 +00002886 return( ret );
2887 }
2888
2889 len = ssl->out_msglen;
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01002890 ssl->out_len[0] = (unsigned char)( len >> 8 );
2891 ssl->out_len[1] = (unsigned char)( len );
Paul Bakker05ef8352012-05-08 09:17:57 +00002892 }
2893
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002894 ssl->out_left = mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen;
Paul Bakker05ef8352012-05-08 09:17:57 +00002895
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002896 MBEDTLS_SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, "
Paul Bakker05ef8352012-05-08 09:17:57 +00002897 "version = [%d:%d], msglen = %d",
2898 ssl->out_hdr[0], ssl->out_hdr[1], ssl->out_hdr[2],
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01002899 ( ssl->out_len[0] << 8 ) | ssl->out_len[1] ) );
Paul Bakker05ef8352012-05-08 09:17:57 +00002900
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002901 MBEDTLS_SSL_DEBUG_BUF( 4, "output record sent to network",
2902 ssl->out_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen );
Paul Bakker5121ce52009-01-03 21:22:43 +00002903 }
2904
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002905 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00002906 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002907 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00002908 return( ret );
2909 }
2910
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002911 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write record" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00002912
2913 return( 0 );
2914}
2915
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002916#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002917/*
2918 * Mark bits in bitmask (used for DTLS HS reassembly)
2919 */
2920static void ssl_bitmask_set( unsigned char *mask, size_t offset, size_t len )
2921{
2922 unsigned int start_bits, end_bits;
2923
2924 start_bits = 8 - ( offset % 8 );
2925 if( start_bits != 8 )
2926 {
2927 size_t first_byte_idx = offset / 8;
2928
Manuel Pégourié-Gonnardac030522014-09-02 14:23:40 +02002929 /* Special case */
2930 if( len <= start_bits )
2931 {
2932 for( ; len != 0; len-- )
2933 mask[first_byte_idx] |= 1 << ( start_bits - len );
2934
2935 /* Avoid potential issues with offset or len becoming invalid */
2936 return;
2937 }
2938
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002939 offset += start_bits; /* Now offset % 8 == 0 */
2940 len -= start_bits;
2941
2942 for( ; start_bits != 0; start_bits-- )
2943 mask[first_byte_idx] |= 1 << ( start_bits - 1 );
2944 }
2945
2946 end_bits = len % 8;
2947 if( end_bits != 0 )
2948 {
2949 size_t last_byte_idx = ( offset + len ) / 8;
2950
2951 len -= end_bits; /* Now len % 8 == 0 */
2952
2953 for( ; end_bits != 0; end_bits-- )
2954 mask[last_byte_idx] |= 1 << ( 8 - end_bits );
2955 }
2956
2957 memset( mask + offset / 8, 0xFF, len / 8 );
2958}
2959
2960/*
2961 * Check that bitmask is full
2962 */
2963static int ssl_bitmask_check( unsigned char *mask, size_t len )
2964{
2965 size_t i;
2966
2967 for( i = 0; i < len / 8; i++ )
2968 if( mask[i] != 0xFF )
2969 return( -1 );
2970
2971 for( i = 0; i < len % 8; i++ )
2972 if( ( mask[len / 8] & ( 1 << ( 7 - i ) ) ) == 0 )
2973 return( -1 );
2974
2975 return( 0 );
2976}
2977
2978/*
2979 * Reassemble fragmented DTLS handshake messages.
2980 *
2981 * Use a temporary buffer for reassembly, divided in two parts:
2982 * - the first holds the reassembled message (including handshake header),
2983 * - the second holds a bitmask indicating which parts of the message
2984 * (excluding headers) have been received so far.
2985 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002986static int ssl_reassemble_dtls_handshake( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02002987{
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002988 unsigned char *msg, *bitmask;
2989 size_t frag_len, frag_off;
2990 size_t msg_len = ssl->in_hslen - 12; /* Without headers */
2991
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02002992 if( ssl->handshake == NULL )
2993 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02002994 MBEDTLS_SSL_DEBUG_MSG( 1, ( "not supported outside handshake (for now)" ) );
2995 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02002996 }
2997
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02002998 /*
2999 * For first fragment, check size and allocate buffer
3000 */
3001 if( ssl->handshake->hs_msg == NULL )
3002 {
3003 size_t alloc_len;
3004
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003005 MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialize reassembly, total length = %d",
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003006 msg_len ) );
3007
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003008 if( ssl->in_hslen > MBEDTLS_SSL_MAX_CONTENT_LEN )
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003009 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003010 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too large" ) );
3011 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003012 }
3013
3014 /* The bitmask needs one bit per byte of message excluding header */
3015 alloc_len = 12 + msg_len + msg_len / 8 + ( msg_len % 8 != 0 );
3016
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02003017 ssl->handshake->hs_msg = mbedtls_calloc( 1, alloc_len );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003018 if( ssl->handshake->hs_msg == NULL )
3019 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02003020 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", alloc_len ) );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02003021 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003022 }
3023
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003024 /* Prepare final header: copy msg_type, length and message_seq,
3025 * then add standardised fragment_offset and fragment_length */
3026 memcpy( ssl->handshake->hs_msg, ssl->in_msg, 6 );
3027 memset( ssl->handshake->hs_msg + 6, 0, 3 );
3028 memcpy( ssl->handshake->hs_msg + 9,
3029 ssl->handshake->hs_msg + 1, 3 );
3030 }
3031 else
3032 {
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003033 /* Make sure msg_type and length are consistent */
3034 if( memcmp( ssl->handshake->hs_msg, ssl->in_msg, 4 ) != 0 )
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003035 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003036 MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment header mismatch" ) );
3037 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003038 }
3039 }
3040
3041 msg = ssl->handshake->hs_msg + 12;
3042 bitmask = msg + msg_len;
3043
3044 /*
3045 * Check and copy current fragment
3046 */
3047 frag_off = ( ssl->in_msg[6] << 16 ) |
3048 ( ssl->in_msg[7] << 8 ) |
3049 ssl->in_msg[8];
3050 frag_len = ( ssl->in_msg[9] << 16 ) |
3051 ( ssl->in_msg[10] << 8 ) |
3052 ssl->in_msg[11];
3053
3054 if( frag_off + frag_len > msg_len )
3055 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003056 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment offset/len: %d + %d > %d",
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003057 frag_off, frag_len, msg_len ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003058 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003059 }
3060
3061 if( frag_len + 12 > ssl->in_msglen )
3062 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003063 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment length: %d + 12 > %d",
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003064 frag_len, ssl->in_msglen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003065 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003066 }
3067
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003068 MBEDTLS_SSL_DEBUG_MSG( 2, ( "adding fragment, offset = %d, length = %d",
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003069 frag_off, frag_len ) );
3070
3071 memcpy( msg + frag_off, ssl->in_msg + 12, frag_len );
3072 ssl_bitmask_set( bitmask, frag_off, frag_len );
3073
3074 /*
3075 * Do we have the complete message by now?
3076 * If yes, finalize it, else ask to read the next record.
3077 */
3078 if( ssl_bitmask_check( bitmask, msg_len ) != 0 )
3079 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003080 MBEDTLS_SSL_DEBUG_MSG( 2, ( "message is not complete yet" ) );
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01003081 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003082 }
3083
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003084 MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake message completed" ) );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003085
Manuel Pégourié-Gonnard23cad332014-10-13 17:06:41 +02003086 if( frag_len + 12 < ssl->in_msglen )
3087 {
3088 /*
3089 * We'got more handshake messages in the same record.
3090 * This case is not handled now because no know implementation does
3091 * that and it's hard to test, so we prefer to fail cleanly for now.
3092 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003093 MBEDTLS_SSL_DEBUG_MSG( 1, ( "last fragment not alone in its record" ) );
3094 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnard23cad332014-10-13 17:06:41 +02003095 }
3096
Manuel Pégourié-Gonnard64dffc52014-09-02 13:39:16 +02003097 if( ssl->in_left > ssl->next_record_offset )
3098 {
3099 /*
3100 * We've got more data in the buffer after the current record,
3101 * that we don't want to overwrite. Move it before writing the
3102 * reassembled message, and adjust in_left and next_record_offset.
3103 */
3104 unsigned char *cur_remain = ssl->in_hdr + ssl->next_record_offset;
3105 unsigned char *new_remain = ssl->in_msg + ssl->in_hslen;
3106 size_t remain_len = ssl->in_left - ssl->next_record_offset;
3107
3108 /* First compute and check new lengths */
3109 ssl->next_record_offset = new_remain - ssl->in_hdr;
3110 ssl->in_left = ssl->next_record_offset + remain_len;
3111
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003112 if( ssl->in_left > MBEDTLS_SSL_BUFFER_LEN -
Manuel Pégourié-Gonnard64dffc52014-09-02 13:39:16 +02003113 (size_t)( ssl->in_hdr - ssl->in_buf ) )
3114 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003115 MBEDTLS_SSL_DEBUG_MSG( 1, ( "reassembled message too large for buffer" ) );
3116 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
Manuel Pégourié-Gonnard64dffc52014-09-02 13:39:16 +02003117 }
3118
3119 memmove( new_remain, cur_remain, remain_len );
3120 }
3121
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003122 memcpy( ssl->in_msg, ssl->handshake->hs_msg, ssl->in_hslen );
3123
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003124 mbedtls_free( ssl->handshake->hs_msg );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003125 ssl->handshake->hs_msg = NULL;
3126
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003127 MBEDTLS_SSL_DEBUG_BUF( 3, "reassembled handshake message",
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003128 ssl->in_msg, ssl->in_hslen );
3129
3130 return( 0 );
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003131}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003132#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003133
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003134static int ssl_prepare_handshake_record( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003135{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003136 if( ssl->in_msglen < mbedtls_ssl_hs_hdr_len( ssl ) )
Manuel Pégourié-Gonnard9d1d7192014-09-03 11:01:14 +02003137 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003138 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too short: %d",
Manuel Pégourié-Gonnard9d1d7192014-09-03 11:01:14 +02003139 ssl->in_msglen ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003140 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Manuel Pégourié-Gonnard9d1d7192014-09-03 11:01:14 +02003141 }
3142
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003143 ssl->in_hslen = mbedtls_ssl_hs_hdr_len( ssl ) + (
Manuel Pégourié-Gonnard9d1d7192014-09-03 11:01:14 +02003144 ( ssl->in_msg[1] << 16 ) |
3145 ( ssl->in_msg[2] << 8 ) |
3146 ssl->in_msg[3] );
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003147
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003148 MBEDTLS_SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003149 " %d, type = %d, hslen = %d",
Manuel Pégourié-Gonnardce441b32014-02-18 17:40:52 +01003150 ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003151
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003152#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003153 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003154 {
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003155 int ret;
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003156 unsigned int recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003157
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003158 /* ssl->handshake is NULL when receiving ClientHello for renego */
3159 if( ssl->handshake != NULL &&
3160 recv_msg_seq != ssl->handshake->in_msg_seq )
3161 {
Manuel Pégourié-Gonnardfc572dd2014-10-09 17:56:57 +02003162 /* Retransmit only on last message from previous flight, to avoid
3163 * too many retransmissions.
3164 * Besides, No sane server ever retransmits HelloVerifyRequest */
3165 if( recv_msg_seq == ssl->handshake->in_flight_start_seq - 1 &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003166 ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST )
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02003167 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003168 MBEDTLS_SSL_DEBUG_MSG( 2, ( "received message from last flight, "
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02003169 "message_seq = %d, start_of_flight = %d",
3170 recv_msg_seq,
3171 ssl->handshake->in_flight_start_seq ) );
3172
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003173 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02003174 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003175 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02003176 return( ret );
3177 }
3178 }
3179 else
3180 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003181 MBEDTLS_SSL_DEBUG_MSG( 2, ( "dropping out-of-sequence message: "
Manuel Pégourié-Gonnard6a2bdfa2014-09-19 21:18:23 +02003182 "message_seq = %d, expected = %d",
3183 recv_msg_seq,
3184 ssl->handshake->in_msg_seq ) );
3185 }
3186
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01003187 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003188 }
3189 /* Wait until message completion to increment in_msg_seq */
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003190
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003191 /* Reassemble if current message is fragmented or reassembly is
3192 * already in progress */
3193 if( ssl->in_msglen < ssl->in_hslen ||
3194 memcmp( ssl->in_msg + 6, "\0\0\0", 3 ) != 0 ||
3195 memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 ||
3196 ( ssl->handshake != NULL && ssl->handshake->hs_msg != NULL ) )
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003197 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003198 MBEDTLS_SSL_DEBUG_MSG( 2, ( "found fragmented DTLS handshake message" ) );
Manuel Pégourié-Gonnard502bf302014-08-20 13:12:58 +02003199
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003200 if( ( ret = ssl_reassemble_dtls_handshake( ssl ) ) != 0 )
3201 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003202 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_reassemble_dtls_handshake", ret );
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003203 return( ret );
3204 }
3205 }
3206 }
3207 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003208#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnarded79a4b2014-08-20 10:43:01 +02003209 /* With TLS we don't handle fragmentation (for now) */
3210 if( ssl->in_msglen < ssl->in_hslen )
3211 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003212 MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS handshake fragmentation not supported" ) );
3213 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003214 }
3215
Manuel Pégourié-Gonnard14bf7062015-06-23 14:07:13 +02003216 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER &&
3217 ssl->handshake != NULL )
3218 {
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003219 ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen );
Manuel Pégourié-Gonnard14bf7062015-06-23 14:07:13 +02003220 }
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003221
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003222 /* Handshake message is complete, increment counter */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003223#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003224 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02003225 ssl->handshake != NULL )
3226 {
3227 ssl->handshake->in_msg_seq++;
3228 }
3229#endif
3230
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01003231 return( 0 );
3232}
3233
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003234/*
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003235 * DTLS anti-replay: RFC 6347 4.1.2.6
3236 *
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003237 * in_window is a field of bits numbered from 0 (lsb) to 63 (msb).
3238 * Bit n is set iff record number in_window_top - n has been seen.
3239 *
3240 * Usually, in_window_top is the last record number seen and the lsb of
3241 * in_window is set. The only exception is the initial state (record number 0
3242 * not seen yet).
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003243 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003244#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
3245static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003246{
3247 ssl->in_window_top = 0;
3248 ssl->in_window = 0;
3249}
3250
3251static inline uint64_t ssl_load_six_bytes( unsigned char *buf )
3252{
3253 return( ( (uint64_t) buf[0] << 40 ) |
3254 ( (uint64_t) buf[1] << 32 ) |
3255 ( (uint64_t) buf[2] << 24 ) |
3256 ( (uint64_t) buf[3] << 16 ) |
3257 ( (uint64_t) buf[4] << 8 ) |
3258 ( (uint64_t) buf[5] ) );
3259}
3260
3261/*
3262 * Return 0 if sequence number is acceptable, -1 otherwise
3263 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003264int mbedtls_ssl_dtls_replay_check( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003265{
3266 uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
3267 uint64_t bit;
3268
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003269 if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
Manuel Pégourié-Gonnard27393132014-09-24 14:41:11 +02003270 return( 0 );
3271
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003272 if( rec_seqnum > ssl->in_window_top )
3273 return( 0 );
3274
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003275 bit = ssl->in_window_top - rec_seqnum;
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003276
3277 if( bit >= 64 )
3278 return( -1 );
3279
3280 if( ( ssl->in_window & ( (uint64_t) 1 << bit ) ) != 0 )
3281 return( -1 );
3282
3283 return( 0 );
3284}
3285
3286/*
3287 * Update replay window on new validated record
3288 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003289void mbedtls_ssl_dtls_replay_update( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003290{
3291 uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
3292
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003293 if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
Manuel Pégourié-Gonnard27393132014-09-24 14:41:11 +02003294 return;
3295
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003296 if( rec_seqnum > ssl->in_window_top )
3297 {
3298 /* Update window_top and the contents of the window */
3299 uint64_t shift = rec_seqnum - ssl->in_window_top;
3300
3301 if( shift >= 64 )
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003302 ssl->in_window = 1;
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003303 else
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003304 {
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003305 ssl->in_window <<= shift;
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003306 ssl->in_window |= 1;
3307 }
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003308
3309 ssl->in_window_top = rec_seqnum;
3310 }
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003311 else
3312 {
3313 /* Mark that number as seen in the current window */
Manuel Pégourié-Gonnard4956fd72014-09-24 11:13:44 +02003314 uint64_t bit = ssl->in_window_top - rec_seqnum;
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003315
3316 if( bit < 64 ) /* Always true, but be extra sure */
3317 ssl->in_window |= (uint64_t) 1 << bit;
3318 }
3319}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003320#endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003321
Manuel Pégourié-Gonnardddfe5d22015-09-09 12:46:16 +02003322#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003323/* Forward declaration */
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02003324static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial );
3325
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003326/*
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003327 * Without any SSL context, check if a datagram looks like a ClientHello with
3328 * a valid cookie, and if it doesn't, generate a HelloVerifyRequest message.
Simon Butcher0789aed2015-09-11 17:15:17 +01003329 * Both input and output include full DTLS headers.
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003330 *
3331 * - if cookie is valid, return 0
3332 * - if ClientHello looks superficially valid but cookie is not,
3333 * fill obuf and set olen, then
3334 * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
3335 * - otherwise return a specific error code
3336 */
3337static int ssl_check_dtls_clihlo_cookie(
3338 mbedtls_ssl_cookie_write_t *f_cookie_write,
3339 mbedtls_ssl_cookie_check_t *f_cookie_check,
3340 void *p_cookie,
3341 const unsigned char *cli_id, size_t cli_id_len,
3342 const unsigned char *in, size_t in_len,
3343 unsigned char *obuf, size_t buf_len, size_t *olen )
3344{
3345 size_t sid_len, cookie_len;
3346 unsigned char *p;
3347
3348 if( f_cookie_write == NULL || f_cookie_check == NULL )
3349 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
3350
3351 /*
3352 * Structure of ClientHello with record and handshake headers,
3353 * and expected values. We don't need to check a lot, more checks will be
3354 * done when actually parsing the ClientHello - skipping those checks
3355 * avoids code duplication and does not make cookie forging any easier.
3356 *
3357 * 0-0 ContentType type; copied, must be handshake
3358 * 1-2 ProtocolVersion version; copied
3359 * 3-4 uint16 epoch; copied, must be 0
3360 * 5-10 uint48 sequence_number; copied
3361 * 11-12 uint16 length; (ignored)
3362 *
3363 * 13-13 HandshakeType msg_type; (ignored)
3364 * 14-16 uint24 length; (ignored)
3365 * 17-18 uint16 message_seq; copied
3366 * 19-21 uint24 fragment_offset; copied, must be 0
3367 * 22-24 uint24 fragment_length; (ignored)
3368 *
3369 * 25-26 ProtocolVersion client_version; (ignored)
3370 * 27-58 Random random; (ignored)
3371 * 59-xx SessionID session_id; 1 byte len + sid_len content
3372 * 60+ opaque cookie<0..2^8-1>; 1 byte len + content
3373 * ...
3374 *
3375 * Minimum length is 61 bytes.
3376 */
3377 if( in_len < 61 ||
3378 in[0] != MBEDTLS_SSL_MSG_HANDSHAKE ||
3379 in[3] != 0 || in[4] != 0 ||
3380 in[19] != 0 || in[20] != 0 || in[21] != 0 )
3381 {
3382 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3383 }
3384
3385 sid_len = in[59];
3386 if( sid_len > in_len - 61 )
3387 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3388
3389 cookie_len = in[60 + sid_len];
3390 if( cookie_len > in_len - 60 )
3391 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3392
3393 if( f_cookie_check( p_cookie, in + sid_len + 61, cookie_len,
3394 cli_id, cli_id_len ) == 0 )
3395 {
3396 /* Valid cookie */
3397 return( 0 );
3398 }
3399
3400 /*
3401 * If we get here, we've got an invalid cookie, let's prepare HVR.
3402 *
3403 * 0-0 ContentType type; copied
3404 * 1-2 ProtocolVersion version; copied
3405 * 3-4 uint16 epoch; copied
3406 * 5-10 uint48 sequence_number; copied
3407 * 11-12 uint16 length; olen - 13
3408 *
3409 * 13-13 HandshakeType msg_type; hello_verify_request
3410 * 14-16 uint24 length; olen - 25
3411 * 17-18 uint16 message_seq; copied
3412 * 19-21 uint24 fragment_offset; copied
3413 * 22-24 uint24 fragment_length; olen - 25
3414 *
3415 * 25-26 ProtocolVersion server_version; 0xfe 0xff
3416 * 27-27 opaque cookie<0..2^8-1>; cookie_len = olen - 27, cookie
3417 *
3418 * Minimum length is 28.
3419 */
3420 if( buf_len < 28 )
3421 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
3422
3423 /* Copy most fields and adapt others */
3424 memcpy( obuf, in, 25 );
3425 obuf[13] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
3426 obuf[25] = 0xfe;
3427 obuf[26] = 0xff;
3428
3429 /* Generate and write actual cookie */
3430 p = obuf + 28;
3431 if( f_cookie_write( p_cookie,
3432 &p, obuf + buf_len, cli_id, cli_id_len ) != 0 )
3433 {
3434 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
3435 }
3436
3437 *olen = p - obuf;
3438
3439 /* Go back and fill length fields */
3440 obuf[27] = (unsigned char)( *olen - 28 );
3441
3442 obuf[14] = obuf[22] = (unsigned char)( ( *olen - 25 ) >> 16 );
3443 obuf[15] = obuf[23] = (unsigned char)( ( *olen - 25 ) >> 8 );
3444 obuf[16] = obuf[24] = (unsigned char)( ( *olen - 25 ) );
3445
3446 obuf[11] = (unsigned char)( ( *olen - 13 ) >> 8 );
3447 obuf[12] = (unsigned char)( ( *olen - 13 ) );
3448
3449 return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
3450}
3451
3452/*
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003453 * Handle possible client reconnect with the same UDP quadruplet
3454 * (RFC 6347 Section 4.2.8).
3455 *
3456 * Called by ssl_parse_record_header() in case we receive an epoch 0 record
3457 * that looks like a ClientHello.
3458 *
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003459 * - if the input looks like a ClientHello without cookies,
3460 * send back HelloVerifyRequest, then
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003461 * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003462 * - if the input looks like a ClientHello with a valid cookie,
3463 * reset the session of the current context, and
Manuel Pégourié-Gonnardbe619c12015-09-08 11:21:21 +02003464 * return MBEDTLS_ERR_SSL_CLIENT_RECONNECT
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003465 * - if anything goes wrong, return a specific error code
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003466 *
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003467 * mbedtls_ssl_read_record() will ignore the record if anything else than
Simon Butcherd0bf6a32015-09-11 17:34:49 +01003468 * MBEDTLS_ERR_SSL_CLIENT_RECONNECT or 0 is returned, although this function
3469 * cannot not return 0.
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003470 */
3471static int ssl_handle_possible_reconnect( mbedtls_ssl_context *ssl )
3472{
3473 int ret;
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003474 size_t len;
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003475
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003476 ret = ssl_check_dtls_clihlo_cookie(
3477 ssl->conf->f_cookie_write,
3478 ssl->conf->f_cookie_check,
3479 ssl->conf->p_cookie,
3480 ssl->cli_id, ssl->cli_id_len,
3481 ssl->in_buf, ssl->in_left,
3482 ssl->out_buf, MBEDTLS_SSL_MAX_CONTENT_LEN, &len );
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003483
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003484 MBEDTLS_SSL_DEBUG_RET( 2, "ssl_check_dtls_clihlo_cookie", ret );
3485
3486 if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED )
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003487 {
Brian J Murraye7f8dc32016-11-06 04:45:15 -08003488 /* Don't check write errors as we can't do anything here.
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003489 * If the error is permanent we'll catch it later,
3490 * if it's not, then hopefully it'll work next time. */
3491 (void) ssl->f_send( ssl->p_bio, ssl->out_buf, len );
3492
3493 return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003494 }
3495
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003496 if( ret == 0 )
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003497 {
Manuel Pégourié-Gonnard62c74bb2015-09-08 17:50:29 +02003498 /* Got a valid cookie, partially reset context */
3499 if( ( ret = ssl_session_reset_int( ssl, 1 ) ) != 0 )
3500 {
3501 MBEDTLS_SSL_DEBUG_RET( 1, "reset", ret );
3502 return( ret );
3503 }
3504
3505 return( MBEDTLS_ERR_SSL_CLIENT_RECONNECT );
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003506 }
3507
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003508 return( ret );
3509}
Manuel Pégourié-Gonnardddfe5d22015-09-09 12:46:16 +02003510#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
Manuel Pégourié-Gonnard11331fc2015-09-08 10:30:55 +02003511
Manuel Pégourié-Gonnard7a7e1402014-09-24 10:52:58 +02003512/*
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003513 * ContentType type;
3514 * ProtocolVersion version;
3515 * uint16 epoch; // DTLS only
3516 * uint48 sequence_number; // DTLS only
3517 * uint16 length;
Manuel Pégourié-Gonnard013198f2015-12-03 16:13:17 +01003518 *
3519 * Return 0 if header looks sane (and, for DTLS, the record is expected)
Simon Butchere103aa82015-12-16 01:51:01 +00003520 * MBEDTLS_ERR_SSL_INVALID_RECORD if the header looks bad,
Manuel Pégourié-Gonnard013198f2015-12-03 16:13:17 +01003521 * MBEDTLS_ERR_SSL_UNEXPECTED_RECORD (DTLS only) if sane but unexpected.
3522 *
3523 * With DTLS, mbedtls_ssl_read_record() will:
Simon Butchere103aa82015-12-16 01:51:01 +00003524 * 1. proceed with the record if this function returns 0
3525 * 2. drop only the current record if this function returns UNEXPECTED_RECORD
3526 * 3. return CLIENT_RECONNECT if this function returns that value
3527 * 4. drop the whole datagram if this function returns anything else.
3528 * Point 2 is needed when the peer is resending, and we have already received
3529 * the first record from a datagram but are still waiting for the others.
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003530 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003531static int ssl_parse_record_header( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00003532{
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01003533 int major_ver, minor_ver;
Paul Bakker5121ce52009-01-03 21:22:43 +00003534
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003535 MBEDTLS_SSL_DEBUG_BUF( 4, "input record header", ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) );
Manuel Pégourié-Gonnard64dffc52014-09-02 13:39:16 +02003536
Paul Bakker5121ce52009-01-03 21:22:43 +00003537 ssl->in_msgtype = ssl->in_hdr[0];
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01003538 ssl->in_msglen = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003539 mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, ssl->in_hdr + 1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00003540
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003541 MBEDTLS_SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, "
Paul Bakker5121ce52009-01-03 21:22:43 +00003542 "version = [%d:%d], msglen = %d",
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003543 ssl->in_msgtype,
3544 major_ver, minor_ver, ssl->in_msglen ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00003545
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003546 /* Check record type */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003547 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE &&
3548 ssl->in_msgtype != MBEDTLS_SSL_MSG_ALERT &&
3549 ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
3550 ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003551 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003552 MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type" ) );
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01003553
Andres Amaya Garcia1042d862017-07-05 13:26:34 +01003554#if defined(MBEDTLS_SSL_PROTO_DTLS)
3555 /* Silently ignore invalid DTLS records as recommended by RFC 6347
3556 * Section 4.1.2.7 */
3557 if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3558#endif /* MBEDTLS_SSL_PROTO_DTLS */
3559 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3560 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003561
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003562 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003563 }
3564
3565 /* Check version */
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01003566 if( major_ver != ssl->major_ver )
Paul Bakker5121ce52009-01-03 21:22:43 +00003567 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003568 MBEDTLS_SSL_DEBUG_MSG( 1, ( "major version mismatch" ) );
3569 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003570 }
3571
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003572 if( minor_ver > ssl->conf->max_minor_ver )
Paul Bakker5121ce52009-01-03 21:22:43 +00003573 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003574 MBEDTLS_SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) );
3575 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003576 }
3577
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003578 /* Check length against the size of our buffer */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003579 if( ssl->in_msglen > MBEDTLS_SSL_BUFFER_LEN
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003580 - (size_t)( ssl->in_msg - ssl->in_buf ) )
Paul Bakker1a1fbba2014-04-30 14:38:05 +02003581 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003582 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3583 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker1a1fbba2014-04-30 14:38:05 +02003584 }
3585
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003586 /* Check length against bounds of the current transform and version */
Paul Bakker48916f92012-09-16 19:57:18 +00003587 if( ssl->transform_in == NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00003588 {
Manuel Pégourié-Gonnardedcbe542014-08-11 19:27:24 +02003589 if( ssl->in_msglen < 1 ||
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003590 ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
Paul Bakker5121ce52009-01-03 21:22:43 +00003591 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003592 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3593 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003594 }
3595 }
3596 else
3597 {
Paul Bakker48916f92012-09-16 19:57:18 +00003598 if( ssl->in_msglen < ssl->transform_in->minlen )
Paul Bakker5121ce52009-01-03 21:22:43 +00003599 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003600 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3601 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003602 }
3603
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003604#if defined(MBEDTLS_SSL_PROTO_SSL3)
3605 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
3606 ssl->in_msglen > ssl->transform_in->minlen + MBEDTLS_SSL_MAX_CONTENT_LEN )
Paul Bakker5121ce52009-01-03 21:22:43 +00003607 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003608 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3609 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003610 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +02003611#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003612#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
3613 defined(MBEDTLS_SSL_PROTO_TLS1_2)
Paul Bakker5121ce52009-01-03 21:22:43 +00003614 /*
3615 * TLS encrypted messages can have up to 256 bytes of padding
3616 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003617 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 &&
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02003618 ssl->in_msglen > ssl->transform_in->minlen +
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003619 MBEDTLS_SSL_MAX_CONTENT_LEN + 256 )
Paul Bakker5121ce52009-01-03 21:22:43 +00003620 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003621 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3622 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003623 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +02003624#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00003625 }
3626
Manuel Pégourié-Gonnard013198f2015-12-03 16:13:17 +01003627 /*
3628 * DTLS-related tests done last, because most of them may result in
3629 * silently dropping the record (but not the whole datagram), and we only
3630 * want to consider that after ensuring that the "basic" fields (type,
3631 * version, length) are sane.
3632 */
3633#if defined(MBEDTLS_SSL_PROTO_DTLS)
3634 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3635 {
3636 unsigned int rec_epoch = ( ssl->in_ctr[0] << 8 ) | ssl->in_ctr[1];
3637
3638 /* Drop unexpected ChangeCipherSpec messages */
3639 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
3640 ssl->state != MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC &&
3641 ssl->state != MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC )
3642 {
3643 MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ChangeCipherSpec" ) );
3644 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3645 }
3646
3647 /* Drop unexpected ApplicationData records,
3648 * except at the beginning of renegotiations */
3649 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA &&
3650 ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER
3651#if defined(MBEDTLS_SSL_RENEGOTIATION)
3652 && ! ( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
3653 ssl->state == MBEDTLS_SSL_SERVER_HELLO )
3654#endif
3655 )
3656 {
3657 MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ApplicationData" ) );
3658 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3659 }
3660
3661 /* Check epoch (and sequence number) with DTLS */
3662 if( rec_epoch != ssl->in_epoch )
3663 {
3664 MBEDTLS_SSL_DEBUG_MSG( 1, ( "record from another epoch: "
3665 "expected %d, received %d",
3666 ssl->in_epoch, rec_epoch ) );
3667
3668#if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
3669 /*
3670 * Check for an epoch 0 ClientHello. We can't use in_msg here to
3671 * access the first byte of record content (handshake type), as we
3672 * have an active transform (possibly iv_len != 0), so use the
3673 * fact that the record header len is 13 instead.
3674 */
3675 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
3676 ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER &&
3677 rec_epoch == 0 &&
3678 ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
3679 ssl->in_left > 13 &&
3680 ssl->in_buf[13] == MBEDTLS_SSL_HS_CLIENT_HELLO )
3681 {
3682 MBEDTLS_SSL_DEBUG_MSG( 1, ( "possible client reconnect "
3683 "from the same port" ) );
3684 return( ssl_handle_possible_reconnect( ssl ) );
3685 }
3686 else
3687#endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
3688 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3689 }
3690
3691#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
3692 /* Replay detection only works for the current epoch */
3693 if( rec_epoch == ssl->in_epoch &&
3694 mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
3695 {
3696 MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record" ) );
3697 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3698 }
3699#endif
3700 }
3701#endif /* MBEDTLS_SSL_PROTO_DTLS */
3702
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003703 return( 0 );
3704}
Paul Bakker5121ce52009-01-03 21:22:43 +00003705
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003706/*
3707 * If applicable, decrypt (and decompress) record content
3708 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003709static int ssl_prepare_record_content( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003710{
3711 int ret, done = 0;
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02003712
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003713 MBEDTLS_SSL_DEBUG_BUF( 4, "input record from network",
3714 ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen );
Paul Bakker5121ce52009-01-03 21:22:43 +00003715
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003716#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
3717 if( mbedtls_ssl_hw_record_read != NULL )
Paul Bakker05ef8352012-05-08 09:17:57 +00003718 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003719 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_read()" ) );
Paul Bakker05ef8352012-05-08 09:17:57 +00003720
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003721 ret = mbedtls_ssl_hw_record_read( ssl );
3722 if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
Paul Bakker05ef8352012-05-08 09:17:57 +00003723 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003724 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_read", ret );
3725 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Paul Bakker05ef8352012-05-08 09:17:57 +00003726 }
Paul Bakkerc7878112012-12-19 14:41:14 +01003727
3728 if( ret == 0 )
3729 done = 1;
Paul Bakker05ef8352012-05-08 09:17:57 +00003730 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003731#endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
Paul Bakker48916f92012-09-16 19:57:18 +00003732 if( !done && ssl->transform_in != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00003733 {
3734 if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 )
3735 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003736 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00003737 return( ret );
3738 }
3739
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003740 MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt",
Paul Bakker5121ce52009-01-03 21:22:43 +00003741 ssl->in_msg, ssl->in_msglen );
3742
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003743 if( ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
Paul Bakker5121ce52009-01-03 21:22:43 +00003744 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003745 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3746 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
Paul Bakker5121ce52009-01-03 21:22:43 +00003747 }
3748 }
3749
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003750#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker48916f92012-09-16 19:57:18 +00003751 if( ssl->transform_in != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003752 ssl->session_in->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
Paul Bakker2770fbd2012-07-03 13:30:23 +00003753 {
3754 if( ( ret = ssl_decompress_buf( ssl ) ) != 0 )
3755 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003756 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret );
Paul Bakker2770fbd2012-07-03 13:30:23 +00003757 return( ret );
3758 }
3759
Manuel Pégourié-Gonnard507e1e42014-02-13 11:17:34 +01003760 ssl->in_len[0] = (unsigned char)( ssl->in_msglen >> 8 );
3761 ssl->in_len[1] = (unsigned char)( ssl->in_msglen );
Paul Bakker2770fbd2012-07-03 13:30:23 +00003762 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003763#endif /* MBEDTLS_ZLIB_SUPPORT */
Paul Bakker2770fbd2012-07-03 13:30:23 +00003764
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003765#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003766 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardb47368a2014-09-24 13:29:58 +02003767 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003768 mbedtls_ssl_dtls_replay_update( ssl );
Manuel Pégourié-Gonnardb47368a2014-09-24 13:29:58 +02003769 }
3770#endif
3771
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003772 return( 0 );
3773}
3774
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003775static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02003776
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003777/*
3778 * Read a record.
3779 *
Manuel Pégourié-Gonnarda3140762015-10-23 11:13:28 +02003780 * Silently ignore non-fatal alert (and for DTLS, invalid records as well,
3781 * RFC 6347 4.1.2.7) and continue reading until a valid record is found.
3782 *
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003783 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003784int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003785{
3786 int ret;
3787
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003788 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read record" ) );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003789
Hanno Becker704f4932017-06-08 13:08:45 +01003790 if( ssl->keep_current_message == 1 )
3791 {
3792 MBEDTLS_SSL_DEBUG_MSG( 2, ( "reuse previously read message" ) );
3793 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read record" ) );
3794 ssl->keep_current_message = 0;
3795
3796 return( 0 );
3797 }
3798
Hanno Becker6a582e82017-06-08 13:38:05 +01003799 /*
3800 * Step A
3801 *
3802 * Consume last content-layer message and potentially
3803 * update in_msglen which keeps track of the contents'
3804 * consumption state.
3805 *
3806 * (1) Handshake messages:
3807 * Remove last handshake message, move content
3808 * and adapt in_msglen.
3809 *
3810 * (2) Alert messages:
3811 * Consume whole record content, in_msglen = 0.
3812 *
3813 * NOTE: This needs to be fixed, since like for
3814 * handshake messages it is allowed to have
3815 * multiple alerts witin a single record.
Hanno Beckerbfbc4942017-06-08 13:39:23 +01003816 * Internal reference IOTSSL-1321.
Hanno Becker6a582e82017-06-08 13:38:05 +01003817 *
3818 * (3) Change cipher spec:
3819 * Consume whole record content, in_msglen = 0.
3820 *
3821 * (4) Application data:
3822 * Don't do anything - the record layer provides
3823 * the application data as a stream transport
3824 * and consumes through mbedtls_ssl_read only.
3825 *
3826 */
3827
3828 /* Case (1): Handshake messages */
3829
3830 if( ssl->in_hslen != 0 )
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003831 {
Hanno Beckerbfbc4942017-06-08 13:39:23 +01003832 if( ssl->in_offt != NULL )
3833 {
3834 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
3835 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
3836 }
3837
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003838 /*
3839 * Get next Handshake message in the current record
3840 */
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003841
Hanno Becker6a582e82017-06-08 13:38:05 +01003842 /* Notes:
3843 * (1) in_hslen is *NOT* necessarily the size of the
3844 * current handshake content: If DTLS handshake
3845 * fragmentation is used, that's the fragment
3846 * size instead. Using the total handshake message
3847 * size here is FAULTY and should be changed at
3848 * some point. Internal reference IOTSSL-1414.
3849 * (2) While it doesn't seem to cause problems, one
3850 * has to be very careful not to assume that in_hslen
3851 * is always <= in_msglen in a sensible communication.
3852 * Again, it's wrong for DTLS handshake fragmentation.
3853 * The following check is therefore mandatory, and
3854 * should not be treated as a silently corrected assertion.
3855 */
3856 if( ssl->in_hslen < ssl->in_msglen )
3857 {
3858 ssl->in_msglen -= ssl->in_hslen;
3859 memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen,
3860 ssl->in_msglen );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003861
Hanno Becker6a582e82017-06-08 13:38:05 +01003862 MBEDTLS_SSL_DEBUG_BUF( 4, "remaining content in record",
3863 ssl->in_msg, ssl->in_msglen );
Manuel Pégourié-Gonnard4a175362014-09-09 17:45:31 +02003864
Hanno Becker6a582e82017-06-08 13:38:05 +01003865 if( ( ret = ssl_prepare_handshake_record( ssl ) ) != 0 )
3866 return( ret );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003867
Hanno Becker6a582e82017-06-08 13:38:05 +01003868 return( 0 );
3869 }
3870 else
3871 {
3872 ssl->in_msglen = 0;
3873 }
3874
3875 ssl->in_hslen = 0;
3876 }
3877 /* Case (4): Application data */
3878 else if( ssl->in_offt != NULL )
3879 {
3880 return( 0 );
3881 }
3882 /* Everything else (CCS & Alerts) */
3883 else
3884 {
3885 ssl->in_msglen = 0;
3886 }
3887
3888 /*
3889 * Step B
3890 *
3891 * Fetch and decode new record if current one is fully consumed.
3892 *
3893 */
3894
3895 if( ssl->in_msglen > 0 )
3896 {
3897 /* There's something left to be processed in the current record. */
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003898 return( 0 );
3899 }
3900
Hanno Becker6a582e82017-06-08 13:38:05 +01003901 /* Need to fetch a new record */
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003902
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003903read_record_header:
Hanno Becker6a582e82017-06-08 13:38:05 +01003904
3905 /* Current record either fully processed or to be discarded. */
3906
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003907 if( ( ret = mbedtls_ssl_fetch_input( ssl, mbedtls_ssl_hdr_len( ssl ) ) ) != 0 )
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003908 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003909 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003910 return( ret );
3911 }
3912
3913 if( ( ret = ssl_parse_record_header( ssl ) ) != 0 )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003914 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003915#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnardbe619c12015-09-08 11:21:21 +02003916 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
3917 ret != MBEDTLS_ERR_SSL_CLIENT_RECONNECT )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003918 {
Manuel Pégourié-Gonnard013198f2015-12-03 16:13:17 +01003919 if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_RECORD )
3920 {
3921 /* Skip unexpected record (but not whole datagram) */
3922 ssl->next_record_offset = ssl->in_msglen
3923 + mbedtls_ssl_hdr_len( ssl );
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003924
Manuel Pégourié-Gonnard013198f2015-12-03 16:13:17 +01003925 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding unexpected record "
3926 "(header)" ) );
3927 }
3928 else
3929 {
3930 /* Skip invalid record and the rest of the datagram */
3931 ssl->next_record_offset = 0;
3932 ssl->in_left = 0;
3933
3934 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record "
3935 "(header)" ) );
3936 }
3937
3938 /* Get next record */
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003939 goto read_record_header;
3940 }
3941#endif
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003942 return( ret );
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003943 }
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003944
3945 /*
3946 * Read and optionally decrypt the message contents
3947 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003948 if( ( ret = mbedtls_ssl_fetch_input( ssl,
3949 mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen ) ) != 0 )
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003950 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003951 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003952 return( ret );
3953 }
3954
3955 /* Done reading this record, get ready for the next one */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003956#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003957 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003958 ssl->next_record_offset = ssl->in_msglen + mbedtls_ssl_hdr_len( ssl );
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02003959 else
3960#endif
3961 ssl->in_left = 0;
3962
3963 if( ( ret = ssl_prepare_record_content( ssl ) ) != 0 )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003964 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003965#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003966 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003967 {
3968 /* Silently discard invalid records */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003969 if( ret == MBEDTLS_ERR_SSL_INVALID_RECORD ||
3970 ret == MBEDTLS_ERR_SSL_INVALID_MAC )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02003971 {
Manuel Pégourié-Gonnard0a885742015-08-04 12:08:35 +02003972 /* Except when waiting for Finished as a bad mac here
3973 * probably means something went wrong in the handshake
3974 * (eg wrong psk used, mitm downgrade attempt, etc.) */
3975 if( ssl->state == MBEDTLS_SSL_CLIENT_FINISHED ||
3976 ssl->state == MBEDTLS_SSL_SERVER_FINISHED )
3977 {
3978#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
3979 if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
3980 {
3981 mbedtls_ssl_send_alert_message( ssl,
3982 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3983 MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
3984 }
3985#endif
3986 return( ret );
3987 }
3988
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003989#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02003990 if( ssl->conf->badmac_limit != 0 &&
3991 ++ssl->badmac_seen >= ssl->conf->badmac_limit )
Manuel Pégourié-Gonnardb0643d12014-10-14 18:30:36 +02003992 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02003993 MBEDTLS_SSL_DEBUG_MSG( 1, ( "too many records with bad MAC" ) );
3994 return( MBEDTLS_ERR_SSL_INVALID_MAC );
Manuel Pégourié-Gonnardb0643d12014-10-14 18:30:36 +02003995 }
3996#endif
3997
Hanno Becker6a582e82017-06-08 13:38:05 +01003998 /* As above, invalid records cause
3999 * dismissal of the whole datagram. */
4000
4001 ssl->next_record_offset = 0;
4002 ssl->in_left = 0;
4003
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004004 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record (mac)" ) );
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02004005 goto read_record_header;
4006 }
4007
4008 return( ret );
4009 }
4010 else
4011#endif
4012 {
4013 /* Error out (and send alert) on invalid records */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004014#if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
4015 if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02004016 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004017 mbedtls_ssl_send_alert_message( ssl,
4018 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4019 MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
Manuel Pégourié-Gonnard63eca932014-09-08 16:39:08 +02004020 }
4021#endif
4022 return( ret );
4023 }
4024 }
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02004025
4026 /*
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004027 * When we sent the last flight of the handshake, we MUST respond to a
4028 * retransmit of the peer's previous flight with a retransmit. (In
4029 * practice, only the Finished message will make it, other messages
4030 * including CCS use the old transform so they're dropped as invalid.)
4031 *
4032 * If the record we received is not a handshake message, however, it
4033 * means the peer received our last flight so we can clean up
4034 * handshake info.
4035 *
4036 * This check needs to be done before prepare_handshake() due to an edge
4037 * case: if the client immediately requests renegotiation, this
4038 * finishes the current handshake first, avoiding the new ClientHello
4039 * being mistaken for an ancient message in the current handshake.
4040 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004041#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004042 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004043 ssl->handshake != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004044 ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004045 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004046 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
4047 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004048 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004049 MBEDTLS_SSL_DEBUG_MSG( 2, ( "received retransmit of last flight" ) );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004050
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004051 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004052 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004053 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004054 return( ret );
4055 }
4056
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01004057 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02004058 }
4059 else
4060 {
4061 ssl_handshake_wrapup_free_hs_transform( ssl );
4062 }
4063 }
4064#endif
4065
4066 /*
Manuel Pégourié-Gonnard167a3762014-09-08 16:14:10 +02004067 * Handle particular types of records
4068 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004069 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker5121ce52009-01-03 21:22:43 +00004070 {
Manuel Pégourié-Gonnarda59543a2014-02-18 11:33:49 +01004071 if( ( ret = ssl_prepare_handshake_record( ssl ) ) != 0 )
4072 return( ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004073 }
4074
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004075 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
Paul Bakker5121ce52009-01-03 21:22:43 +00004076 {
Angus Grattonfd1c5e82018-06-20 15:43:50 +10004077 if( ssl->in_msglen != 2 )
4078 {
4079 /* Note: Standard allows for more than one 2 byte alert
4080 to be packed in a single message, but Mbed TLS doesn't
4081 currently support this. */
4082 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid alert message, len: %d",
4083 ssl->in_msglen ) );
4084 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
4085 }
4086
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004087 MBEDTLS_SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]",
Paul Bakker5121ce52009-01-03 21:22:43 +00004088 ssl->in_msg[0], ssl->in_msg[1] ) );
4089
4090 /*
Simon Butcher94c5e3c2015-10-27 16:09:03 +00004091 * Ignore non-fatal alerts, except close_notify and no_renegotiation
Paul Bakker5121ce52009-01-03 21:22:43 +00004092 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004093 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_FATAL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004094 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004095 MBEDTLS_SSL_DEBUG_MSG( 1, ( "is a fatal alert message (msg %d)",
Paul Bakker2770fbd2012-07-03 13:30:23 +00004096 ssl->in_msg[1] ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004097 return( MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004098 }
4099
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004100 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
4101 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY )
Paul Bakker5121ce52009-01-03 21:22:43 +00004102 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004103 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a close notify message" ) );
4104 return( MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY );
Paul Bakker5121ce52009-01-03 21:22:43 +00004105 }
Manuel Pégourié-Gonnarda3140762015-10-23 11:13:28 +02004106
4107#if defined(MBEDTLS_SSL_RENEGOTIATION_ENABLED)
4108 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
4109 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION )
4110 {
4111 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
4112 /* Will be handled when trying to parse ServerHello */
4113 return( 0 );
4114 }
4115#endif
4116
4117#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_SRV_C)
4118 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
4119 ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4120 ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
4121 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
4122 {
4123 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
4124 /* Will be handled in mbedtls_ssl_parse_certificate() */
4125 return( 0 );
4126 }
4127#endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */
4128
4129 /* Silently ignore: fetch new message */
4130 goto read_record_header;
Paul Bakker5121ce52009-01-03 21:22:43 +00004131 }
4132
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004133 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read record" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004134
4135 return( 0 );
4136}
4137
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004138int mbedtls_ssl_send_fatal_handshake_failure( mbedtls_ssl_context *ssl )
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00004139{
4140 int ret;
4141
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004142 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
4143 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4144 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ) != 0 )
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00004145 {
4146 return( ret );
4147 }
4148
4149 return( 0 );
4150}
4151
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004152int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl,
Paul Bakker0a925182012-04-16 06:46:41 +00004153 unsigned char level,
4154 unsigned char message )
4155{
4156 int ret;
4157
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02004158 if( ssl == NULL || ssl->conf == NULL )
4159 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
4160
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004161 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> send alert message" ) );
Paul Bakker0a925182012-04-16 06:46:41 +00004162
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004163 ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
Paul Bakker0a925182012-04-16 06:46:41 +00004164 ssl->out_msglen = 2;
4165 ssl->out_msg[0] = level;
4166 ssl->out_msg[1] = message;
4167
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004168 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Paul Bakker0a925182012-04-16 06:46:41 +00004169 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004170 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Paul Bakker0a925182012-04-16 06:46:41 +00004171 return( ret );
4172 }
4173
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004174 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= send alert message" ) );
Paul Bakker0a925182012-04-16 06:46:41 +00004175
4176 return( 0 );
4177}
4178
Paul Bakker5121ce52009-01-03 21:22:43 +00004179/*
4180 * Handshake functions
4181 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004182#if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
4183 !defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) && \
4184 !defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
4185 !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
4186 !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) && \
4187 !defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
4188 !defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
4189int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00004190{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004191 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
Paul Bakker5121ce52009-01-03 21:22:43 +00004192
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004193 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004194
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004195 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4196 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4197 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02004198 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004199 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02004200 ssl->state++;
4201 return( 0 );
4202 }
4203
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004204 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4205 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004206}
4207
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004208int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004209{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004210 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004211
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004212 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004213
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004214 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4215 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4216 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004217 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004218 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004219 ssl->state++;
4220 return( 0 );
4221 }
4222
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004223 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4224 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004225}
4226#else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004227int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004228{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004229 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004230 size_t i, n;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004231 const mbedtls_x509_crt *crt;
4232 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004233
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004234 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004235
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004236 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4237 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4238 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004239 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004240 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
Paul Bakker48f7a5d2013-04-19 14:30:58 +02004241 ssl->state++;
4242 return( 0 );
4243 }
4244
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004245#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004246 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
Paul Bakker5121ce52009-01-03 21:22:43 +00004247 {
4248 if( ssl->client_auth == 0 )
4249 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004250 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004251 ssl->state++;
4252 return( 0 );
4253 }
4254
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004255#if defined(MBEDTLS_SSL_PROTO_SSL3)
Paul Bakker5121ce52009-01-03 21:22:43 +00004256 /*
4257 * If using SSLv3 and got no cert, send an Alert message
4258 * (otherwise an empty Certificate message will be sent).
4259 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004260 if( mbedtls_ssl_own_cert( ssl ) == NULL &&
4261 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004262 {
4263 ssl->out_msglen = 2;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004264 ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
4265 ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING;
4266 ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT;
Paul Bakker5121ce52009-01-03 21:22:43 +00004267
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004268 MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004269 goto write_msg;
4270 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004271#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker5121ce52009-01-03 21:22:43 +00004272 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004273#endif /* MBEDTLS_SSL_CLI_C */
4274#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004275 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Paul Bakker5121ce52009-01-03 21:22:43 +00004276 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004277 if( mbedtls_ssl_own_cert( ssl ) == NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004278 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004279 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
4280 return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED );
Paul Bakker5121ce52009-01-03 21:22:43 +00004281 }
4282 }
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01004283#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00004284
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004285 MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004286
4287 /*
4288 * 0 . 0 handshake type
4289 * 1 . 3 handshake length
4290 * 4 . 6 length of all certs
4291 * 7 . 9 length of cert. 1
4292 * 10 . n-1 peer certificate
4293 * n . n+2 length of cert. 2
4294 * n+3 . ... upper level cert, etc.
4295 */
4296 i = 7;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004297 crt = mbedtls_ssl_own_cert( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00004298
Paul Bakker29087132010-03-21 21:03:34 +00004299 while( crt != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004300 {
4301 n = crt->raw.len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004302 if( n > MBEDTLS_SSL_MAX_CONTENT_LEN - 3 - i )
Paul Bakker5121ce52009-01-03 21:22:43 +00004303 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004304 MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d",
4305 i + 3 + n, MBEDTLS_SSL_MAX_CONTENT_LEN ) );
4306 return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004307 }
4308
4309 ssl->out_msg[i ] = (unsigned char)( n >> 16 );
4310 ssl->out_msg[i + 1] = (unsigned char)( n >> 8 );
4311 ssl->out_msg[i + 2] = (unsigned char)( n );
4312
4313 i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n );
4314 i += n; crt = crt->next;
4315 }
4316
4317 ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 );
4318 ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 );
4319 ssl->out_msg[6] = (unsigned char)( ( i - 7 ) );
4320
4321 ssl->out_msglen = i;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004322 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
4323 ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE;
Paul Bakker5121ce52009-01-03 21:22:43 +00004324
Manuel Pégourié-Gonnardcf141ca2015-05-20 10:35:51 +02004325#if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C)
Paul Bakker5121ce52009-01-03 21:22:43 +00004326write_msg:
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004327#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00004328
4329 ssl->state++;
4330
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004331 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004332 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004333 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004334 return( ret );
4335 }
4336
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004337 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004338
Paul Bakkered27a042013-04-18 22:46:23 +02004339 return( ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004340}
4341
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004342int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00004343{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004344 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Paul Bakker23986e52011-04-24 08:57:21 +00004345 size_t i, n;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004346 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004347 int authmode = ssl->conf->authmode;
Paul Bakker5121ce52009-01-03 21:22:43 +00004348
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004349 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004350
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004351 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4352 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4353 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02004354 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004355 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02004356 ssl->state++;
4357 return( 0 );
4358 }
4359
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004360#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004361 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004362 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
4363 {
4364 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
4365 ssl->state++;
4366 return( 0 );
4367 }
4368
4369#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
4370 if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
4371 authmode = ssl->handshake->sni_authmode;
4372#endif
4373
4374 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4375 authmode == MBEDTLS_SSL_VERIFY_NONE )
Paul Bakker5121ce52009-01-03 21:22:43 +00004376 {
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01004377 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004378 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004379 ssl->state++;
4380 return( 0 );
4381 }
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01004382#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00004383
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004384 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004385 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004386 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004387 return( ret );
4388 }
4389
4390 ssl->state++;
4391
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004392#if defined(MBEDTLS_SSL_SRV_C)
4393#if defined(MBEDTLS_SSL_PROTO_SSL3)
Paul Bakker5121ce52009-01-03 21:22:43 +00004394 /*
4395 * Check if the client sent an empty certificate
4396 */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004397 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004398 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004399 {
Paul Bakker2e11f7d2010-07-25 14:24:53 +00004400 if( ssl->in_msglen == 2 &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004401 ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT &&
4402 ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
4403 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
Paul Bakker5121ce52009-01-03 21:22:43 +00004404 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004405 MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004406
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01004407 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004408 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004409 return( 0 );
4410 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004411 return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004412 }
4413 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004414#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker5121ce52009-01-03 21:22:43 +00004415
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004416#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
4417 defined(MBEDTLS_SSL_PROTO_TLS1_2)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004418 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004419 ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004420 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004421 if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) &&
4422 ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
4423 ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE &&
4424 memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004425 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004426 MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004427
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01004428 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004429 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004430 return( 0 );
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004431 else
4432 return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004433 }
4434 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004435#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
4436 MBEDTLS_SSL_PROTO_TLS1_2 */
4437#endif /* MBEDTLS_SSL_SRV_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00004438
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004439 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker5121ce52009-01-03 21:22:43 +00004440 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004441 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4442 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004443 }
4444
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004445 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE ||
4446 ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004447 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004448 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4449 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004450 }
4451
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004452 i = mbedtls_ssl_hs_hdr_len( ssl );
Manuel Pégourié-Gonnardf49a7da2014-09-10 13:30:43 +00004453
Paul Bakker5121ce52009-01-03 21:22:43 +00004454 /*
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004455 * Same message structure as in mbedtls_ssl_write_certificate()
Paul Bakker5121ce52009-01-03 21:22:43 +00004456 */
Manuel Pégourié-Gonnardf49a7da2014-09-10 13:30:43 +00004457 n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2];
Paul Bakker5121ce52009-01-03 21:22:43 +00004458
Manuel Pégourié-Gonnardf49a7da2014-09-10 13:30:43 +00004459 if( ssl->in_msg[i] != 0 ||
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004460 ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) )
Paul Bakker5121ce52009-01-03 21:22:43 +00004461 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004462 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4463 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004464 }
4465
Manuel Pégourié-Gonnardbfb355c2013-09-07 17:27:43 +02004466 /* In case we tried to reuse a session but it failed */
4467 if( ssl->session_negotiate->peer_cert != NULL )
4468 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004469 mbedtls_x509_crt_free( ssl->session_negotiate->peer_cert );
4470 mbedtls_free( ssl->session_negotiate->peer_cert );
Manuel Pégourié-Gonnardbfb355c2013-09-07 17:27:43 +02004471 }
4472
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02004473 if( ( ssl->session_negotiate->peer_cert = mbedtls_calloc( 1,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004474 sizeof( mbedtls_x509_crt ) ) ) == NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00004475 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02004476 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004477 sizeof( mbedtls_x509_crt ) ) );
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02004478 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Paul Bakker5121ce52009-01-03 21:22:43 +00004479 }
4480
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004481 mbedtls_x509_crt_init( ssl->session_negotiate->peer_cert );
Paul Bakker5121ce52009-01-03 21:22:43 +00004482
Manuel Pégourié-Gonnardf49a7da2014-09-10 13:30:43 +00004483 i += 3;
Paul Bakker5121ce52009-01-03 21:22:43 +00004484
4485 while( i < ssl->in_hslen )
4486 {
Philippe Antoinebbc79182018-05-30 09:13:21 +02004487 if ( i + 3 > ssl->in_hslen ) {
4488 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4489 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4490 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
4491 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4492 }
Paul Bakker5121ce52009-01-03 21:22:43 +00004493 if( ssl->in_msg[i] != 0 )
4494 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004495 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4496 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004497 }
4498
4499 n = ( (unsigned int) ssl->in_msg[i + 1] << 8 )
4500 | (unsigned int) ssl->in_msg[i + 2];
4501 i += 3;
4502
4503 if( n < 128 || i + n > ssl->in_hslen )
4504 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004505 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4506 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004507 }
4508
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004509 ret = mbedtls_x509_crt_parse_der( ssl->session_negotiate->peer_cert,
Paul Bakkerddf26b42013-09-18 13:46:23 +02004510 ssl->in_msg + i, n );
Paul Bakker5121ce52009-01-03 21:22:43 +00004511 if( ret != 0 )
4512 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004513 MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004514 return( ret );
4515 }
4516
4517 i += n;
4518 }
4519
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004520 MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", ssl->session_negotiate->peer_cert );
Paul Bakker5121ce52009-01-03 21:22:43 +00004521
Manuel Pégourié-Gonnard796c6f32014-03-10 09:34:49 +01004522 /*
4523 * On client, make sure the server cert doesn't change during renego to
4524 * avoid "triple handshake" attack: https://secure-resumption.com/
4525 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004526#if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004527 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004528 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
Manuel Pégourié-Gonnard796c6f32014-03-10 09:34:49 +01004529 {
4530 if( ssl->session->peer_cert == NULL )
4531 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004532 MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) );
4533 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Manuel Pégourié-Gonnard796c6f32014-03-10 09:34:49 +01004534 }
4535
4536 if( ssl->session->peer_cert->raw.len !=
4537 ssl->session_negotiate->peer_cert->raw.len ||
4538 memcmp( ssl->session->peer_cert->raw.p,
4539 ssl->session_negotiate->peer_cert->raw.p,
4540 ssl->session->peer_cert->raw.len ) != 0 )
4541 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004542 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server cert changed during renegotiation" ) );
4543 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
Manuel Pégourié-Gonnard796c6f32014-03-10 09:34:49 +01004544 }
4545 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004546#endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard796c6f32014-03-10 09:34:49 +01004547
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02004548 if( authmode != MBEDTLS_SSL_VERIFY_NONE )
Paul Bakker5121ce52009-01-03 21:22:43 +00004549 {
Manuel Pégourié-Gonnard22bfa4b2015-05-11 08:46:37 +02004550 mbedtls_x509_crt *ca_chain;
4551 mbedtls_x509_crl *ca_crl;
4552
Manuel Pégourié-Gonnard8b431fb2015-05-11 12:54:52 +02004553#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
Manuel Pégourié-Gonnard22bfa4b2015-05-11 08:46:37 +02004554 if( ssl->handshake->sni_ca_chain != NULL )
4555 {
4556 ca_chain = ssl->handshake->sni_ca_chain;
4557 ca_crl = ssl->handshake->sni_ca_crl;
4558 }
4559 else
Manuel Pégourié-Gonnard8b431fb2015-05-11 12:54:52 +02004560#endif
Manuel Pégourié-Gonnard22bfa4b2015-05-11 08:46:37 +02004561 {
4562 ca_chain = ssl->conf->ca_chain;
4563 ca_crl = ssl->conf->ca_crl;
4564 }
4565
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004566 /*
4567 * Main check: verify certificate
4568 */
Manuel Pégourié-Gonnard6e3ee3a2015-06-17 10:58:20 +02004569 ret = mbedtls_x509_crt_verify_with_profile(
4570 ssl->session_negotiate->peer_cert,
4571 ca_chain, ca_crl,
4572 ssl->conf->cert_profile,
4573 ssl->hostname,
4574 &ssl->session_negotiate->verify_result,
4575 ssl->conf->f_vrfy, ssl->conf->p_vrfy );
Paul Bakker5121ce52009-01-03 21:22:43 +00004576
4577 if( ret != 0 )
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004578 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004579 MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004580 }
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004581
4582 /*
4583 * Secondary checks: always done, but change 'ret' only if it was 0
4584 */
4585
Manuel Pégourié-Gonnardb541da62015-06-17 11:43:30 +02004586#if defined(MBEDTLS_ECP_C)
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004587 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004588 const mbedtls_pk_context *pk = &ssl->session_negotiate->peer_cert->pk;
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004589
4590 /* If certificate uses an EC key, make sure the curve is OK */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004591 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) &&
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02004592 mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 )
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004593 {
Hanno Beckera3929ba2017-05-08 16:31:14 +01004594 ssl->session_negotiate->verify_result |= MBEDTLS_X509_BADCERT_BAD_KEY;
4595
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004596 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) );
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004597 if( ret == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004598 ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01004599 }
4600 }
Manuel Pégourié-Gonnardb541da62015-06-17 11:43:30 +02004601#endif /* MBEDTLS_ECP_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00004602
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004603 if( mbedtls_ssl_check_cert_usage( ssl->session_negotiate->peer_cert,
Hanno Beckera3929ba2017-05-08 16:31:14 +01004604 ciphersuite_info,
4605 ! ssl->conf->endpoint,
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01004606 &ssl->session_negotiate->verify_result ) != 0 )
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004607 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004608 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) );
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004609 if( ret == 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004610 ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02004611 }
4612
Hanno Beckera3929ba2017-05-08 16:31:14 +01004613 /* mbedtls_x509_crt_verify_with_profile is supposed to report a
4614 * verification failure through MBEDTLS_ERR_X509_CERT_VERIFY_FAILED,
4615 * with details encoded in the verification flags. All other kinds
4616 * of error codes, including those from the user provided f_vrfy
4617 * functions, are treated as fatal and lead to a failure of
4618 * ssl_parse_certificate even if verification was optional. */
4619 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL &&
4620 ( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ||
4621 ret == MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE ) )
4622 {
Paul Bakker5121ce52009-01-03 21:22:43 +00004623 ret = 0;
Hanno Beckera3929ba2017-05-08 16:31:14 +01004624 }
4625
4626 if( ca_chain == NULL && authmode == MBEDTLS_SSL_VERIFY_REQUIRED )
4627 {
4628 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) );
4629 ret = MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED;
4630 }
4631
Hanno Becker61c0c702017-05-15 16:05:15 +01004632#if defined(MBEDTLS_DEBUG_C)
4633 if( ssl->session_negotiate->verify_result != 0 )
4634 {
4635 MBEDTLS_SSL_DEBUG_MSG( 3, ( "! Certificate verification flags %x",
4636 ssl->session_negotiate->verify_result ) );
4637 }
4638 else
4639 {
4640 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Certificate verification flags clear" ) );
4641 }
4642#endif /* MBEDTLS_DEBUG_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00004643 }
4644
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004645 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004646
4647 return( ret );
4648}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004649#endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
4650 !MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED
4651 !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED
4652 !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED
4653 !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
4654 !MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED
4655 !MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
Paul Bakker5121ce52009-01-03 21:22:43 +00004656
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004657int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00004658{
4659 int ret;
4660
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004661 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004662
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004663 ssl->out_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC;
Paul Bakker5121ce52009-01-03 21:22:43 +00004664 ssl->out_msglen = 1;
4665 ssl->out_msg[0] = 1;
4666
Paul Bakker5121ce52009-01-03 21:22:43 +00004667 ssl->state++;
4668
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004669 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004670 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004671 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004672 return( ret );
4673 }
4674
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004675 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004676
4677 return( 0 );
4678}
4679
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004680int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00004681{
4682 int ret;
4683
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004684 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004685
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004686 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00004687 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004688 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00004689 return( ret );
4690 }
4691
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004692 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC )
Paul Bakker5121ce52009-01-03 21:22:43 +00004693 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004694 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
4695 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00004696 }
4697
4698 if( ssl->in_msglen != 1 || ssl->in_msg[0] != 1 )
4699 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004700 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
4701 return( MBEDTLS_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC );
Paul Bakker5121ce52009-01-03 21:22:43 +00004702 }
4703
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004704 /*
4705 * Switch to our negotiated transform and session parameters for inbound
4706 * data.
4707 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004708 MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) );
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004709 ssl->transform_in = ssl->transform_negotiate;
4710 ssl->session_in = ssl->session_negotiate;
4711
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004712#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02004713 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004714 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004715#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004716 ssl_dtls_replay_reset( ssl );
4717#endif
4718
4719 /* Increment epoch */
4720 if( ++ssl->in_epoch == 0 )
4721 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004722 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
4723 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004724 }
4725 }
4726 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004727#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004728 memset( ssl->in_ctr, 0, 8 );
4729
4730 /*
4731 * Set the in_msg pointer to the correct location based on IV length
4732 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004733 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004734 {
4735 ssl->in_msg = ssl->in_iv + ssl->transform_negotiate->ivlen -
4736 ssl->transform_negotiate->fixed_ivlen;
4737 }
4738 else
4739 ssl->in_msg = ssl->in_iv;
4740
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004741#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
4742 if( mbedtls_ssl_hw_record_activate != NULL )
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004743 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004744 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_INBOUND ) ) != 0 )
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004745 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004746 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
4747 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02004748 }
4749 }
4750#endif
4751
Paul Bakker5121ce52009-01-03 21:22:43 +00004752 ssl->state++;
4753
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004754 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004755
4756 return( 0 );
4757}
4758
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004759void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl,
4760 const mbedtls_ssl_ciphersuite_t *ciphersuite_info )
Paul Bakker380da532012-04-18 16:10:25 +00004761{
Paul Bakkerfb08fd22013-08-27 15:06:26 +02004762 ((void) ciphersuite_info);
Paul Bakker769075d2012-11-24 11:26:46 +01004763
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004764#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4765 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4766 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
Paul Bakker48916f92012-09-16 19:57:18 +00004767 ssl->handshake->update_checksum = ssl_update_checksum_md5sha1;
Paul Bakker380da532012-04-18 16:10:25 +00004768 else
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004769#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004770#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4771#if defined(MBEDTLS_SHA512_C)
4772 if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004773 ssl->handshake->update_checksum = ssl_update_checksum_sha384;
4774 else
4775#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004776#if defined(MBEDTLS_SHA256_C)
4777 if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 )
Paul Bakker48916f92012-09-16 19:57:18 +00004778 ssl->handshake->update_checksum = ssl_update_checksum_sha256;
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004779 else
4780#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004781#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Manuel Pégourié-Gonnard61edffe2014-04-11 17:07:31 +02004782 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004783 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004784 return;
Manuel Pégourié-Gonnard61edffe2014-04-11 17:07:31 +02004785 }
Paul Bakker380da532012-04-18 16:10:25 +00004786}
Paul Bakkerf7abd422013-04-16 13:15:56 +02004787
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004788void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard67427c02014-07-11 13:45:34 +02004789{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004790#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4791 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4792 mbedtls_md5_starts( &ssl->handshake->fin_md5 );
4793 mbedtls_sha1_starts( &ssl->handshake->fin_sha1 );
Manuel Pégourié-Gonnard67427c02014-07-11 13:45:34 +02004794#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004795#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4796#if defined(MBEDTLS_SHA256_C)
4797 mbedtls_sha256_starts( &ssl->handshake->fin_sha256, 0 );
Manuel Pégourié-Gonnard67427c02014-07-11 13:45:34 +02004798#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004799#if defined(MBEDTLS_SHA512_C)
4800 mbedtls_sha512_starts( &ssl->handshake->fin_sha512, 1 );
Manuel Pégourié-Gonnard67427c02014-07-11 13:45:34 +02004801#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004802#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Manuel Pégourié-Gonnard67427c02014-07-11 13:45:34 +02004803}
4804
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004805static void ssl_update_checksum_start( mbedtls_ssl_context *ssl,
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02004806 const unsigned char *buf, size_t len )
Paul Bakker380da532012-04-18 16:10:25 +00004807{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004808#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4809 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4810 mbedtls_md5_update( &ssl->handshake->fin_md5 , buf, len );
4811 mbedtls_sha1_update( &ssl->handshake->fin_sha1, buf, len );
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004812#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004813#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4814#if defined(MBEDTLS_SHA256_C)
4815 mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len );
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004816#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004817#if defined(MBEDTLS_SHA512_C)
4818 mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len );
Paul Bakker769075d2012-11-24 11:26:46 +01004819#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004820#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker380da532012-04-18 16:10:25 +00004821}
4822
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004823#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4824 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4825static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl,
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02004826 const unsigned char *buf, size_t len )
Paul Bakker380da532012-04-18 16:10:25 +00004827{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004828 mbedtls_md5_update( &ssl->handshake->fin_md5 , buf, len );
4829 mbedtls_sha1_update( &ssl->handshake->fin_sha1, buf, len );
Paul Bakker380da532012-04-18 16:10:25 +00004830}
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004831#endif
Paul Bakker380da532012-04-18 16:10:25 +00004832
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004833#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4834#if defined(MBEDTLS_SHA256_C)
4835static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl,
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02004836 const unsigned char *buf, size_t len )
Paul Bakker380da532012-04-18 16:10:25 +00004837{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004838 mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len );
Paul Bakker380da532012-04-18 16:10:25 +00004839}
Paul Bakkerd2f068e2013-08-27 21:19:20 +02004840#endif
Paul Bakker380da532012-04-18 16:10:25 +00004841
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004842#if defined(MBEDTLS_SHA512_C)
4843static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl,
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02004844 const unsigned char *buf, size_t len )
Paul Bakker380da532012-04-18 16:10:25 +00004845{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004846 mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len );
Paul Bakker380da532012-04-18 16:10:25 +00004847}
Paul Bakker769075d2012-11-24 11:26:46 +01004848#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004849#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker380da532012-04-18 16:10:25 +00004850
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004851#if defined(MBEDTLS_SSL_PROTO_SSL3)
Paul Bakker1ef83d62012-04-11 12:09:53 +00004852static void ssl_calc_finished_ssl(
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004853 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
Paul Bakker5121ce52009-01-03 21:22:43 +00004854{
Paul Bakker3c2122f2013-06-24 19:03:14 +02004855 const char *sender;
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004856 mbedtls_md5_context md5;
4857 mbedtls_sha1_context sha1;
Paul Bakker1ef83d62012-04-11 12:09:53 +00004858
Paul Bakker5121ce52009-01-03 21:22:43 +00004859 unsigned char padbuf[48];
4860 unsigned char md5sum[16];
4861 unsigned char sha1sum[20];
4862
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004863 mbedtls_ssl_session *session = ssl->session_negotiate;
Paul Bakker48916f92012-09-16 19:57:18 +00004864 if( !session )
4865 session = ssl->session;
4866
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004867 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00004868
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02004869 mbedtls_md5_init( &md5 );
4870 mbedtls_sha1_init( &sha1 );
4871
4872 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
4873 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004874
4875 /*
4876 * SSLv3:
4877 * hash =
4878 * MD5( master + pad2 +
4879 * MD5( handshake + sender + master + pad1 ) )
4880 * + SHA1( master + pad2 +
4881 * SHA1( handshake + sender + master + pad1 ) )
Paul Bakker5121ce52009-01-03 21:22:43 +00004882 */
4883
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004884#if !defined(MBEDTLS_MD5_ALT)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004885 MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
4886 md5.state, sizeof( md5.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02004887#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00004888
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004889#if !defined(MBEDTLS_SHA1_ALT)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004890 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
4891 sha1.state, sizeof( sha1.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02004892#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00004893
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004894 sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT"
Paul Bakker3c2122f2013-06-24 19:03:14 +02004895 : "SRVR";
Paul Bakker5121ce52009-01-03 21:22:43 +00004896
Paul Bakker1ef83d62012-04-11 12:09:53 +00004897 memset( padbuf, 0x36, 48 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004898
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004899 mbedtls_md5_update( &md5, (const unsigned char *) sender, 4 );
4900 mbedtls_md5_update( &md5, session->master, 48 );
4901 mbedtls_md5_update( &md5, padbuf, 48 );
4902 mbedtls_md5_finish( &md5, md5sum );
Paul Bakker5121ce52009-01-03 21:22:43 +00004903
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004904 mbedtls_sha1_update( &sha1, (const unsigned char *) sender, 4 );
4905 mbedtls_sha1_update( &sha1, session->master, 48 );
4906 mbedtls_sha1_update( &sha1, padbuf, 40 );
4907 mbedtls_sha1_finish( &sha1, sha1sum );
Paul Bakker5121ce52009-01-03 21:22:43 +00004908
Paul Bakker1ef83d62012-04-11 12:09:53 +00004909 memset( padbuf, 0x5C, 48 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004910
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004911 mbedtls_md5_starts( &md5 );
4912 mbedtls_md5_update( &md5, session->master, 48 );
4913 mbedtls_md5_update( &md5, padbuf, 48 );
4914 mbedtls_md5_update( &md5, md5sum, 16 );
4915 mbedtls_md5_finish( &md5, buf );
Paul Bakker5121ce52009-01-03 21:22:43 +00004916
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004917 mbedtls_sha1_starts( &sha1 );
4918 mbedtls_sha1_update( &sha1, session->master, 48 );
4919 mbedtls_sha1_update( &sha1, padbuf , 40 );
4920 mbedtls_sha1_update( &sha1, sha1sum, 20 );
4921 mbedtls_sha1_finish( &sha1, buf + 16 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004922
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004923 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004924
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004925 mbedtls_md5_free( &md5 );
4926 mbedtls_sha1_free( &sha1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004927
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004928 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
4929 mbedtls_zeroize( md5sum, sizeof( md5sum ) );
4930 mbedtls_zeroize( sha1sum, sizeof( sha1sum ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004931
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004932 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004933}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004934#endif /* MBEDTLS_SSL_PROTO_SSL3 */
Paul Bakker5121ce52009-01-03 21:22:43 +00004935
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004936#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
Paul Bakker1ef83d62012-04-11 12:09:53 +00004937static void ssl_calc_finished_tls(
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004938 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
Paul Bakker5121ce52009-01-03 21:22:43 +00004939{
Paul Bakker1ef83d62012-04-11 12:09:53 +00004940 int len = 12;
Paul Bakker3c2122f2013-06-24 19:03:14 +02004941 const char *sender;
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004942 mbedtls_md5_context md5;
4943 mbedtls_sha1_context sha1;
Paul Bakker1ef83d62012-04-11 12:09:53 +00004944 unsigned char padbuf[36];
Paul Bakker5121ce52009-01-03 21:22:43 +00004945
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004946 mbedtls_ssl_session *session = ssl->session_negotiate;
Paul Bakker48916f92012-09-16 19:57:18 +00004947 if( !session )
4948 session = ssl->session;
4949
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004950 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00004951
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02004952 mbedtls_md5_init( &md5 );
4953 mbedtls_sha1_init( &sha1 );
4954
4955 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
4956 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00004957
Paul Bakker1ef83d62012-04-11 12:09:53 +00004958 /*
4959 * TLSv1:
4960 * hash = PRF( master, finished_label,
4961 * MD5( handshake ) + SHA1( handshake ) )[0..11]
4962 */
Paul Bakker5121ce52009-01-03 21:22:43 +00004963
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004964#if !defined(MBEDTLS_MD5_ALT)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004965 MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
4966 md5.state, sizeof( md5.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02004967#endif
Paul Bakker1ef83d62012-04-11 12:09:53 +00004968
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004969#if !defined(MBEDTLS_SHA1_ALT)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004970 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
4971 sha1.state, sizeof( sha1.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02004972#endif
Paul Bakker1ef83d62012-04-11 12:09:53 +00004973
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004974 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
Paul Bakker3c2122f2013-06-24 19:03:14 +02004975 ? "client finished"
4976 : "server finished";
Paul Bakker1ef83d62012-04-11 12:09:53 +00004977
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004978 mbedtls_md5_finish( &md5, padbuf );
4979 mbedtls_sha1_finish( &sha1, padbuf + 16 );
Paul Bakker1ef83d62012-04-11 12:09:53 +00004980
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02004981 ssl->handshake->tls_prf( session->master, 48, sender,
Paul Bakker48916f92012-09-16 19:57:18 +00004982 padbuf, 36, buf, len );
Paul Bakker1ef83d62012-04-11 12:09:53 +00004983
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004984 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
Paul Bakker1ef83d62012-04-11 12:09:53 +00004985
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02004986 mbedtls_md5_free( &md5 );
4987 mbedtls_sha1_free( &sha1 );
Paul Bakker1ef83d62012-04-11 12:09:53 +00004988
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004989 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00004990
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004991 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00004992}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004993#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
Paul Bakker1ef83d62012-04-11 12:09:53 +00004994
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004995#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4996#if defined(MBEDTLS_SHA256_C)
Paul Bakkerca4ab492012-04-18 14:23:57 +00004997static void ssl_calc_finished_tls_sha256(
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02004998 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
Paul Bakker1ef83d62012-04-11 12:09:53 +00004999{
5000 int len = 12;
Paul Bakker3c2122f2013-06-24 19:03:14 +02005001 const char *sender;
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005002 mbedtls_sha256_context sha256;
Paul Bakker1ef83d62012-04-11 12:09:53 +00005003 unsigned char padbuf[32];
5004
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005005 mbedtls_ssl_session *session = ssl->session_negotiate;
Paul Bakker48916f92012-09-16 19:57:18 +00005006 if( !session )
5007 session = ssl->session;
5008
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02005009 mbedtls_sha256_init( &sha256 );
5010
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005011 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005012
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02005013 mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005014
5015 /*
5016 * TLSv1.2:
5017 * hash = PRF( master, finished_label,
5018 * Hash( handshake ) )[0.11]
5019 */
5020
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005021#if !defined(MBEDTLS_SHA256_ALT)
5022 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005023 sha256.state, sizeof( sha256.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02005024#endif
Paul Bakker1ef83d62012-04-11 12:09:53 +00005025
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005026 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
Paul Bakker3c2122f2013-06-24 19:03:14 +02005027 ? "client finished"
5028 : "server finished";
Paul Bakker1ef83d62012-04-11 12:09:53 +00005029
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005030 mbedtls_sha256_finish( &sha256, padbuf );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005031
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02005032 ssl->handshake->tls_prf( session->master, 48, sender,
Paul Bakker48916f92012-09-16 19:57:18 +00005033 padbuf, 32, buf, len );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005034
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005035 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005036
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005037 mbedtls_sha256_free( &sha256 );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005038
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005039 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005040
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005041 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005042}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005043#endif /* MBEDTLS_SHA256_C */
Paul Bakker1ef83d62012-04-11 12:09:53 +00005044
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005045#if defined(MBEDTLS_SHA512_C)
Paul Bakkerca4ab492012-04-18 14:23:57 +00005046static void ssl_calc_finished_tls_sha384(
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005047 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
Paul Bakkerca4ab492012-04-18 14:23:57 +00005048{
5049 int len = 12;
Paul Bakker3c2122f2013-06-24 19:03:14 +02005050 const char *sender;
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005051 mbedtls_sha512_context sha512;
Paul Bakkerca4ab492012-04-18 14:23:57 +00005052 unsigned char padbuf[48];
5053
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005054 mbedtls_ssl_session *session = ssl->session_negotiate;
Paul Bakker48916f92012-09-16 19:57:18 +00005055 if( !session )
5056 session = ssl->session;
5057
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02005058 mbedtls_sha512_init( &sha512 );
5059
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005060 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005061
Manuel Pégourié-Gonnard001f2b62015-07-06 16:21:13 +02005062 mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005063
5064 /*
5065 * TLSv1.2:
5066 * hash = PRF( master, finished_label,
5067 * Hash( handshake ) )[0.11]
5068 */
5069
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005070#if !defined(MBEDTLS_SHA512_ALT)
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005071 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *)
5072 sha512.state, sizeof( sha512.state ) );
Paul Bakker90995b52013-06-24 19:20:35 +02005073#endif
Paul Bakkerca4ab492012-04-18 14:23:57 +00005074
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005075 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
Paul Bakker3c2122f2013-06-24 19:03:14 +02005076 ? "client finished"
5077 : "server finished";
Paul Bakkerca4ab492012-04-18 14:23:57 +00005078
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005079 mbedtls_sha512_finish( &sha512, padbuf );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005080
Paul Bakkerb6c5d2e2013-06-25 16:25:17 +02005081 ssl->handshake->tls_prf( session->master, 48, sender,
Paul Bakker48916f92012-09-16 19:57:18 +00005082 padbuf, 48, buf, len );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005083
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005084 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005085
Manuel Pégourié-Gonnardc0bf01e2015-07-06 16:11:18 +02005086 mbedtls_sha512_free( &sha512 );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005087
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005088 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005089
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005090 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
Paul Bakkerca4ab492012-04-18 14:23:57 +00005091}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005092#endif /* MBEDTLS_SHA512_C */
5093#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakkerca4ab492012-04-18 14:23:57 +00005094
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005095static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl )
Paul Bakker48916f92012-09-16 19:57:18 +00005096{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005097 MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00005098
5099 /*
5100 * Free our handshake params
5101 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005102 mbedtls_ssl_handshake_free( ssl->handshake );
5103 mbedtls_free( ssl->handshake );
Paul Bakker48916f92012-09-16 19:57:18 +00005104 ssl->handshake = NULL;
5105
5106 /*
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005107 * Free the previous transform and swith in the current one
Paul Bakker48916f92012-09-16 19:57:18 +00005108 */
5109 if( ssl->transform )
5110 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005111 mbedtls_ssl_transform_free( ssl->transform );
5112 mbedtls_free( ssl->transform );
Paul Bakker48916f92012-09-16 19:57:18 +00005113 }
5114 ssl->transform = ssl->transform_negotiate;
5115 ssl->transform_negotiate = NULL;
5116
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005117 MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005118}
5119
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005120void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005121{
5122 int resume = ssl->handshake->resume;
5123
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005124 MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005125
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005126#if defined(MBEDTLS_SSL_RENEGOTIATION)
5127 if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005128 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005129 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE;
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005130 ssl->renego_records_seen = 0;
5131 }
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005132#endif
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005133
5134 /*
5135 * Free the previous session and switch in the current one
5136 */
Paul Bakker0a597072012-09-25 21:55:46 +00005137 if( ssl->session )
5138 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005139#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
Manuel Pégourié-Gonnard1a034732014-11-04 17:36:18 +01005140 /* RFC 7366 3.1: keep the EtM state */
5141 ssl->session_negotiate->encrypt_then_mac =
5142 ssl->session->encrypt_then_mac;
5143#endif
5144
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005145 mbedtls_ssl_session_free( ssl->session );
5146 mbedtls_free( ssl->session );
Paul Bakker0a597072012-09-25 21:55:46 +00005147 }
5148 ssl->session = ssl->session_negotiate;
Paul Bakker48916f92012-09-16 19:57:18 +00005149 ssl->session_negotiate = NULL;
5150
Paul Bakker0a597072012-09-25 21:55:46 +00005151 /*
5152 * Add cache entry
5153 */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005154 if( ssl->conf->f_set_cache != NULL &&
Manuel Pégourié-Gonnard12ad7982015-06-18 15:50:37 +02005155 ssl->session->id_len != 0 &&
Manuel Pégourié-Gonnardc086cce2013-08-02 14:13:02 +02005156 resume == 0 )
5157 {
Manuel Pégourié-Gonnard5cb33082015-05-06 18:06:26 +01005158 if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005159 MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) );
Manuel Pégourié-Gonnardc086cce2013-08-02 14:13:02 +02005160 }
Paul Bakker0a597072012-09-25 21:55:46 +00005161
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005162#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005163 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005164 ssl->handshake->flight != NULL )
5165 {
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02005166 /* Cancel handshake timer */
5167 ssl_set_timer( ssl, 0 );
5168
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005169 /* Keep last flight around in case we need to resend it:
5170 * we need the handshake and transform structures for that */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005171 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) );
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02005172 }
5173 else
5174#endif
5175 ssl_handshake_wrapup_free_hs_transform( ssl );
5176
Paul Bakker48916f92012-09-16 19:57:18 +00005177 ssl->state++;
5178
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005179 MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00005180}
5181
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005182int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl )
Paul Bakker1ef83d62012-04-11 12:09:53 +00005183{
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005184 int ret, hash_len;
Paul Bakker1ef83d62012-04-11 12:09:53 +00005185
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005186 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005187
Paul Bakker92be97b2013-01-02 17:30:03 +01005188 /*
5189 * Set the out_msg pointer to the correct location based on IV length
5190 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005191 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
Paul Bakker92be97b2013-01-02 17:30:03 +01005192 {
5193 ssl->out_msg = ssl->out_iv + ssl->transform_negotiate->ivlen -
5194 ssl->transform_negotiate->fixed_ivlen;
5195 }
5196 else
5197 ssl->out_msg = ssl->out_iv;
5198
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005199 ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint );
Paul Bakker1ef83d62012-04-11 12:09:53 +00005200
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005201 hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12;
Paul Bakker5121ce52009-01-03 21:22:43 +00005202
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005203#if defined(MBEDTLS_SSL_RENEGOTIATION)
Paul Bakker48916f92012-09-16 19:57:18 +00005204 ssl->verify_data_len = hash_len;
5205 memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len );
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005206#endif
Paul Bakker48916f92012-09-16 19:57:18 +00005207
Paul Bakker5121ce52009-01-03 21:22:43 +00005208 ssl->out_msglen = 4 + hash_len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005209 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
5210 ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED;
Paul Bakker5121ce52009-01-03 21:22:43 +00005211
5212 /*
5213 * In case of session resuming, invert the client and server
5214 * ChangeCipherSpec messages order.
5215 */
Paul Bakker0a597072012-09-25 21:55:46 +00005216 if( ssl->handshake->resume != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00005217 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005218#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005219 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005220 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01005221#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005222#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005223 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005224 ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01005225#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00005226 }
5227 else
5228 ssl->state++;
5229
Paul Bakker48916f92012-09-16 19:57:18 +00005230 /*
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02005231 * Switch to our negotiated transform and session parameters for outbound
5232 * data.
Paul Bakker48916f92012-09-16 19:57:18 +00005233 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005234 MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) );
Manuel Pégourié-Gonnard5afb1672014-02-16 18:33:22 +01005235
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005236#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005237 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005238 {
5239 unsigned char i;
5240
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02005241 /* Remember current epoch settings for resending */
5242 ssl->handshake->alt_transform_out = ssl->transform_out;
5243 memcpy( ssl->handshake->alt_out_ctr, ssl->out_ctr, 8 );
5244
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005245 /* Set sequence_number to zero */
5246 memset( ssl->out_ctr + 2, 0, 6 );
5247
5248 /* Increment epoch */
5249 for( i = 2; i > 0; i-- )
5250 if( ++ssl->out_ctr[i - 1] != 0 )
5251 break;
5252
5253 /* The loop goes to its end iff the counter is wrapping */
5254 if( i == 0 )
5255 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005256 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
5257 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005258 }
5259 }
5260 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005261#endif /* MBEDTLS_SSL_PROTO_DTLS */
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005262 memset( ssl->out_ctr, 0, 8 );
Paul Bakker5121ce52009-01-03 21:22:43 +00005263
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02005264 ssl->transform_out = ssl->transform_negotiate;
5265 ssl->session_out = ssl->session_negotiate;
5266
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005267#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
5268 if( mbedtls_ssl_hw_record_activate != NULL )
Paul Bakker07eb38b2012-12-19 14:42:06 +01005269 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005270 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
Paul Bakker07eb38b2012-12-19 14:42:06 +01005271 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005272 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
5273 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Paul Bakker07eb38b2012-12-19 14:42:06 +01005274 }
5275 }
5276#endif
5277
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005278#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005279 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005280 mbedtls_ssl_send_flight_completed( ssl );
Manuel Pégourié-Gonnard7de3c9e2014-09-29 15:29:48 +02005281#endif
5282
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005283 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00005284 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005285 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00005286 return( ret );
5287 }
5288
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005289 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00005290
5291 return( 0 );
5292}
5293
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005294#if defined(MBEDTLS_SSL_PROTO_SSL3)
Manuel Pégourié-Gonnardca6440b2014-09-10 12:39:54 +00005295#define SSL_MAX_HASH_LEN 36
5296#else
5297#define SSL_MAX_HASH_LEN 12
5298#endif
5299
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005300int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00005301{
Paul Bakker23986e52011-04-24 08:57:21 +00005302 int ret;
Manuel Pégourié-Gonnard879a4f92014-07-11 22:31:12 +02005303 unsigned int hash_len;
Manuel Pégourié-Gonnardca6440b2014-09-10 12:39:54 +00005304 unsigned char buf[SSL_MAX_HASH_LEN];
Paul Bakker5121ce52009-01-03 21:22:43 +00005305
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005306 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00005307
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005308 ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00005309
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005310 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00005311 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005312 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00005313 return( ret );
5314 }
5315
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005316 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker5121ce52009-01-03 21:22:43 +00005317 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005318 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
5319 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00005320 }
5321
Manuel Pégourié-Gonnardca6440b2014-09-10 12:39:54 +00005322 /* There is currently no ciphersuite using another length with TLS 1.2 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005323#if defined(MBEDTLS_SSL_PROTO_SSL3)
5324 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Manuel Pégourié-Gonnardca6440b2014-09-10 12:39:54 +00005325 hash_len = 36;
5326 else
5327#endif
5328 hash_len = 12;
Paul Bakker5121ce52009-01-03 21:22:43 +00005329
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005330 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED ||
5331 ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len )
Paul Bakker5121ce52009-01-03 21:22:43 +00005332 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005333 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
5334 return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
Paul Bakker5121ce52009-01-03 21:22:43 +00005335 }
5336
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005337 if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ),
Manuel Pégourié-Gonnard4abc3272014-09-10 12:02:46 +00005338 buf, hash_len ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00005339 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005340 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
5341 return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
Paul Bakker5121ce52009-01-03 21:22:43 +00005342 }
5343
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005344#if defined(MBEDTLS_SSL_RENEGOTIATION)
Paul Bakker48916f92012-09-16 19:57:18 +00005345 ssl->verify_data_len = hash_len;
5346 memcpy( ssl->peer_verify_data, buf, hash_len );
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005347#endif
Paul Bakker48916f92012-09-16 19:57:18 +00005348
Paul Bakker0a597072012-09-25 21:55:46 +00005349 if( ssl->handshake->resume != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00005350 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005351#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005352 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005353 ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01005354#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005355#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005356 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005357 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01005358#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00005359 }
5360 else
5361 ssl->state++;
5362
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005363#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005364 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005365 mbedtls_ssl_recv_flight_completed( ssl );
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02005366#endif
5367
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005368 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00005369
5370 return( 0 );
5371}
5372
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005373static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake )
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005374{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005375 memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005376
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005377#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
5378 defined(MBEDTLS_SSL_PROTO_TLS1_1)
5379 mbedtls_md5_init( &handshake->fin_md5 );
5380 mbedtls_sha1_init( &handshake->fin_sha1 );
5381 mbedtls_md5_starts( &handshake->fin_md5 );
5382 mbedtls_sha1_starts( &handshake->fin_sha1 );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005383#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005384#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
5385#if defined(MBEDTLS_SHA256_C)
5386 mbedtls_sha256_init( &handshake->fin_sha256 );
5387 mbedtls_sha256_starts( &handshake->fin_sha256, 0 );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005388#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005389#if defined(MBEDTLS_SHA512_C)
5390 mbedtls_sha512_init( &handshake->fin_sha512 );
5391 mbedtls_sha512_starts( &handshake->fin_sha512, 1 );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005392#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005393#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005394
5395 handshake->update_checksum = ssl_update_checksum_start;
Hanno Beckeraa8a2bd2017-04-28 17:15:26 +01005396
5397#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
5398 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
5399 mbedtls_ssl_sig_hash_set_init( &handshake->hash_algs );
5400#endif
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005401
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005402#if defined(MBEDTLS_DHM_C)
5403 mbedtls_dhm_init( &handshake->dhm_ctx );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005404#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005405#if defined(MBEDTLS_ECDH_C)
5406 mbedtls_ecdh_init( &handshake->ecdh_ctx );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005407#endif
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02005408
5409#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
5410 handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET;
5411#endif
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005412}
5413
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005414static void ssl_transform_init( mbedtls_ssl_transform *transform )
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005415{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005416 memset( transform, 0, sizeof(mbedtls_ssl_transform) );
Paul Bakker84bbeb52014-07-01 14:53:22 +02005417
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005418 mbedtls_cipher_init( &transform->cipher_ctx_enc );
5419 mbedtls_cipher_init( &transform->cipher_ctx_dec );
Paul Bakker84bbeb52014-07-01 14:53:22 +02005420
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005421 mbedtls_md_init( &transform->md_ctx_enc );
5422 mbedtls_md_init( &transform->md_ctx_dec );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005423}
5424
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005425void mbedtls_ssl_session_init( mbedtls_ssl_session *session )
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005426{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005427 memset( session, 0, sizeof(mbedtls_ssl_session) );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005428}
5429
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005430static int ssl_handshake_init( mbedtls_ssl_context *ssl )
Paul Bakker48916f92012-09-16 19:57:18 +00005431{
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005432 /* Clear old handshake information if present */
Paul Bakker48916f92012-09-16 19:57:18 +00005433 if( ssl->transform_negotiate )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005434 mbedtls_ssl_transform_free( ssl->transform_negotiate );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005435 if( ssl->session_negotiate )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005436 mbedtls_ssl_session_free( ssl->session_negotiate );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005437 if( ssl->handshake )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005438 mbedtls_ssl_handshake_free( ssl->handshake );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005439
5440 /*
5441 * Either the pointers are now NULL or cleared properly and can be freed.
5442 * Now allocate missing structures.
5443 */
5444 if( ssl->transform_negotiate == NULL )
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005445 {
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02005446 ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) );
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005447 }
Paul Bakker48916f92012-09-16 19:57:18 +00005448
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005449 if( ssl->session_negotiate == NULL )
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005450 {
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02005451 ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) );
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005452 }
Paul Bakker48916f92012-09-16 19:57:18 +00005453
Paul Bakker82788fb2014-10-20 13:59:19 +02005454 if( ssl->handshake == NULL )
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005455 {
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02005456 ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) );
Paul Bakkerb9cfaa02013-10-11 18:58:55 +02005457 }
Paul Bakker48916f92012-09-16 19:57:18 +00005458
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005459 /* All pointers should exist and can be directly freed without issue */
Paul Bakker48916f92012-09-16 19:57:18 +00005460 if( ssl->handshake == NULL ||
5461 ssl->transform_negotiate == NULL ||
5462 ssl->session_negotiate == NULL )
5463 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02005464 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005465
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005466 mbedtls_free( ssl->handshake );
5467 mbedtls_free( ssl->transform_negotiate );
5468 mbedtls_free( ssl->session_negotiate );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005469
5470 ssl->handshake = NULL;
5471 ssl->transform_negotiate = NULL;
5472 ssl->session_negotiate = NULL;
5473
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02005474 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Paul Bakker48916f92012-09-16 19:57:18 +00005475 }
5476
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005477 /* Initialize structures */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005478 mbedtls_ssl_session_init( ssl->session_negotiate );
Paul Bakkeraccaffe2014-06-26 13:37:14 +02005479 ssl_transform_init( ssl->transform_negotiate );
Paul Bakker968afaa2014-07-09 11:09:24 +02005480 ssl_handshake_params_init( ssl->handshake );
5481
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005482#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard06939ce2015-05-11 11:25:46 +02005483 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5484 {
5485 ssl->handshake->alt_transform_out = ssl->transform_out;
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02005486
Manuel Pégourié-Gonnard06939ce2015-05-11 11:25:46 +02005487 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
5488 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
5489 else
5490 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +02005491
5492 ssl_set_timer( ssl, 0 );
Manuel Pégourié-Gonnard06939ce2015-05-11 11:25:46 +02005493 }
Manuel Pégourié-Gonnard5d8ba532014-09-19 15:09:21 +02005494#endif
5495
Paul Bakker48916f92012-09-16 19:57:18 +00005496 return( 0 );
5497}
5498
Manuel Pégourié-Gonnarde057d3b2015-05-20 10:59:43 +02005499#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02005500/* Dummy cookie callbacks for defaults */
5501static int ssl_cookie_write_dummy( void *ctx,
5502 unsigned char **p, unsigned char *end,
5503 const unsigned char *cli_id, size_t cli_id_len )
5504{
5505 ((void) ctx);
5506 ((void) p);
5507 ((void) end);
5508 ((void) cli_id);
5509 ((void) cli_id_len);
5510
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005511 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02005512}
5513
5514static int ssl_cookie_check_dummy( void *ctx,
5515 const unsigned char *cookie, size_t cookie_len,
5516 const unsigned char *cli_id, size_t cli_id_len )
5517{
5518 ((void) ctx);
5519 ((void) cookie);
5520 ((void) cookie_len);
5521 ((void) cli_id);
5522 ((void) cli_id_len);
5523
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005524 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02005525}
Manuel Pégourié-Gonnarde057d3b2015-05-20 10:59:43 +02005526#endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */
Manuel Pégourié-Gonnard7d38d212014-07-23 17:52:09 +02005527
Paul Bakker5121ce52009-01-03 21:22:43 +00005528/*
5529 * Initialize an SSL context
5530 */
Manuel Pégourié-Gonnard41d479e2015-04-29 00:48:22 +02005531void mbedtls_ssl_init( mbedtls_ssl_context *ssl )
5532{
5533 memset( ssl, 0, sizeof( mbedtls_ssl_context ) );
5534}
5535
5536/*
5537 * Setup an SSL context
5538 */
Manuel Pégourié-Gonnarddef0bbe2015-05-04 14:56:36 +02005539int mbedtls_ssl_setup( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard1897af92015-05-10 23:27:38 +02005540 const mbedtls_ssl_config *conf )
Paul Bakker5121ce52009-01-03 21:22:43 +00005541{
Paul Bakker48916f92012-09-16 19:57:18 +00005542 int ret;
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02005543 const size_t len = MBEDTLS_SSL_BUFFER_LEN;
Paul Bakker5121ce52009-01-03 21:22:43 +00005544
Manuel Pégourié-Gonnarddef0bbe2015-05-04 14:56:36 +02005545 ssl->conf = conf;
Paul Bakker62f2dee2012-09-28 07:31:51 +00005546
5547 /*
Manuel Pégourié-Gonnard06193482014-02-14 08:39:32 +01005548 * Prepare base structures
Paul Bakker62f2dee2012-09-28 07:31:51 +00005549 */
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02005550 if( ( ssl-> in_buf = mbedtls_calloc( 1, len ) ) == NULL ||
5551 ( ssl->out_buf = mbedtls_calloc( 1, len ) ) == NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00005552 {
Manuel Pégourié-Gonnardb2a18a22015-05-27 16:29:56 +02005553 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", len ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005554 mbedtls_free( ssl->in_buf );
Manuel Pégourié-Gonnard7ee6f0e2014-02-13 10:54:07 +01005555 ssl->in_buf = NULL;
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02005556 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Paul Bakker5121ce52009-01-03 21:22:43 +00005557 }
5558
Manuel Pégourié-Gonnard419d5ae2015-05-04 19:32:36 +02005559#if defined(MBEDTLS_SSL_PROTO_DTLS)
5560 if( conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5561 {
5562 ssl->out_hdr = ssl->out_buf;
5563 ssl->out_ctr = ssl->out_buf + 3;
5564 ssl->out_len = ssl->out_buf + 11;
5565 ssl->out_iv = ssl->out_buf + 13;
5566 ssl->out_msg = ssl->out_buf + 13;
5567
5568 ssl->in_hdr = ssl->in_buf;
5569 ssl->in_ctr = ssl->in_buf + 3;
5570 ssl->in_len = ssl->in_buf + 11;
5571 ssl->in_iv = ssl->in_buf + 13;
5572 ssl->in_msg = ssl->in_buf + 13;
5573 }
5574 else
5575#endif
5576 {
5577 ssl->out_ctr = ssl->out_buf;
5578 ssl->out_hdr = ssl->out_buf + 8;
5579 ssl->out_len = ssl->out_buf + 11;
5580 ssl->out_iv = ssl->out_buf + 13;
5581 ssl->out_msg = ssl->out_buf + 13;
5582
5583 ssl->in_ctr = ssl->in_buf;
5584 ssl->in_hdr = ssl->in_buf + 8;
5585 ssl->in_len = ssl->in_buf + 11;
5586 ssl->in_iv = ssl->in_buf + 13;
5587 ssl->in_msg = ssl->in_buf + 13;
5588 }
5589
Paul Bakker48916f92012-09-16 19:57:18 +00005590 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
5591 return( ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00005592
5593 return( 0 );
5594}
5595
5596/*
Paul Bakker7eb013f2011-10-06 12:37:39 +00005597 * Reset an initialized and used SSL context for re-use while retaining
5598 * all application-set variables, function pointers and data.
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005599 *
5600 * If partial is non-zero, keep data in the input buffer and client ID.
5601 * (Use when a DTLS client reconnects from the same port.)
Paul Bakker7eb013f2011-10-06 12:37:39 +00005602 */
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005603static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial )
Paul Bakker7eb013f2011-10-06 12:37:39 +00005604{
Paul Bakker48916f92012-09-16 19:57:18 +00005605 int ret;
5606
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005607 ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005608
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +02005609 /* Cancel any possibly running timer */
5610 ssl_set_timer( ssl, 0 );
5611
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005612#if defined(MBEDTLS_SSL_RENEGOTIATION)
5613 ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE;
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005614 ssl->renego_records_seen = 0;
Paul Bakker48916f92012-09-16 19:57:18 +00005615
5616 ssl->verify_data_len = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005617 memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
5618 memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01005619#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005620 ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION;
Paul Bakker48916f92012-09-16 19:57:18 +00005621
Paul Bakker7eb013f2011-10-06 12:37:39 +00005622 ssl->in_offt = NULL;
5623
Manuel Pégourié-Gonnard7ee6f0e2014-02-13 10:54:07 +01005624 ssl->in_msg = ssl->in_buf + 13;
Paul Bakker7eb013f2011-10-06 12:37:39 +00005625 ssl->in_msgtype = 0;
5626 ssl->in_msglen = 0;
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005627 if( partial == 0 )
5628 ssl->in_left = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005629#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02005630 ssl->next_record_offset = 0;
Manuel Pégourié-Gonnard246c13a2014-09-24 13:56:09 +02005631 ssl->in_epoch = 0;
Manuel Pégourié-Gonnardb2f3be82014-07-10 17:54:52 +02005632#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005633#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
Manuel Pégourié-Gonnardb47368a2014-09-24 13:29:58 +02005634 ssl_dtls_replay_reset( ssl );
5635#endif
Paul Bakker7eb013f2011-10-06 12:37:39 +00005636
5637 ssl->in_hslen = 0;
5638 ssl->nb_zero = 0;
Hanno Becker704f4932017-06-08 13:08:45 +01005639 ssl->keep_current_message = 0;
Paul Bakker7eb013f2011-10-06 12:37:39 +00005640
Manuel Pégourié-Gonnard7ee6f0e2014-02-13 10:54:07 +01005641 ssl->out_msg = ssl->out_buf + 13;
Paul Bakker7eb013f2011-10-06 12:37:39 +00005642 ssl->out_msgtype = 0;
5643 ssl->out_msglen = 0;
5644 ssl->out_left = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005645#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
5646 if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED )
Manuel Pégourié-Gonnardcfa477e2015-01-07 14:50:54 +01005647 ssl->split_done = 0;
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01005648#endif
Paul Bakker7eb013f2011-10-06 12:37:39 +00005649
Paul Bakker48916f92012-09-16 19:57:18 +00005650 ssl->transform_in = NULL;
5651 ssl->transform_out = NULL;
Paul Bakker7eb013f2011-10-06 12:37:39 +00005652
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005653 memset( ssl->out_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005654 if( partial == 0 )
5655 memset( ssl->in_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
Paul Bakker05ef8352012-05-08 09:17:57 +00005656
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005657#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
5658 if( mbedtls_ssl_hw_record_reset != NULL )
Paul Bakker05ef8352012-05-08 09:17:57 +00005659 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005660 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) );
5661 if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 )
Paul Bakker2770fbd2012-07-03 13:30:23 +00005662 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005663 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret );
5664 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
Paul Bakker2770fbd2012-07-03 13:30:23 +00005665 }
Paul Bakker05ef8352012-05-08 09:17:57 +00005666 }
5667#endif
Paul Bakker2770fbd2012-07-03 13:30:23 +00005668
Paul Bakker48916f92012-09-16 19:57:18 +00005669 if( ssl->transform )
Paul Bakker2770fbd2012-07-03 13:30:23 +00005670 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005671 mbedtls_ssl_transform_free( ssl->transform );
5672 mbedtls_free( ssl->transform );
Paul Bakker48916f92012-09-16 19:57:18 +00005673 ssl->transform = NULL;
Paul Bakker2770fbd2012-07-03 13:30:23 +00005674 }
Paul Bakker48916f92012-09-16 19:57:18 +00005675
Paul Bakkerc0463502013-02-14 11:19:38 +01005676 if( ssl->session )
5677 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005678 mbedtls_ssl_session_free( ssl->session );
5679 mbedtls_free( ssl->session );
Paul Bakkerc0463502013-02-14 11:19:38 +01005680 ssl->session = NULL;
5681 }
5682
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005683#if defined(MBEDTLS_SSL_ALPN)
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02005684 ssl->alpn_chosen = NULL;
5685#endif
5686
Manuel Pégourié-Gonnarde057d3b2015-05-20 10:59:43 +02005687#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005688 if( partial == 0 )
5689 {
5690 mbedtls_free( ssl->cli_id );
5691 ssl->cli_id = NULL;
5692 ssl->cli_id_len = 0;
5693 }
Manuel Pégourié-Gonnard43c02182014-07-22 17:32:01 +02005694#endif
5695
Paul Bakker48916f92012-09-16 19:57:18 +00005696 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
5697 return( ret );
Paul Bakker2770fbd2012-07-03 13:30:23 +00005698
5699 return( 0 );
Paul Bakker7eb013f2011-10-06 12:37:39 +00005700}
5701
Manuel Pégourié-Gonnard779e4292013-08-03 13:50:48 +02005702/*
Manuel Pégourié-Gonnard3f09b6d2015-09-08 11:58:14 +02005703 * Reset an initialized and used SSL context for re-use while retaining
5704 * all application-set variables, function pointers and data.
5705 */
5706int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl )
5707{
5708 return( ssl_session_reset_int( ssl, 0 ) );
5709}
5710
5711/*
Paul Bakker5121ce52009-01-03 21:22:43 +00005712 * SSL set accessors
5713 */
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005714void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint )
Paul Bakker5121ce52009-01-03 21:22:43 +00005715{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005716 conf->endpoint = endpoint;
Paul Bakker5121ce52009-01-03 21:22:43 +00005717}
5718
Manuel Pégourié-Gonnard01e5e8c2015-05-11 10:11:56 +02005719void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport )
Manuel Pégourié-Gonnard0b1ff292014-02-06 13:04:16 +01005720{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005721 conf->transport = transport;
Manuel Pégourié-Gonnard0b1ff292014-02-06 13:04:16 +01005722}
5723
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005724#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005725void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode )
Manuel Pégourié-Gonnard27393132014-09-24 14:41:11 +02005726{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005727 conf->anti_replay = mode;
Manuel Pégourié-Gonnard27393132014-09-24 14:41:11 +02005728}
5729#endif
5730
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005731#if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005732void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit )
Manuel Pégourié-Gonnardb0643d12014-10-14 18:30:36 +02005733{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005734 conf->badmac_limit = limit;
Manuel Pégourié-Gonnardb0643d12014-10-14 18:30:36 +02005735}
5736#endif
5737
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005738#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005739void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf, uint32_t min, uint32_t max )
Manuel Pégourié-Gonnard905dd242014-10-01 12:03:55 +02005740{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005741 conf->hs_timeout_min = min;
5742 conf->hs_timeout_max = max;
Manuel Pégourié-Gonnard905dd242014-10-01 12:03:55 +02005743}
5744#endif
5745
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005746void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode )
Paul Bakker5121ce52009-01-03 21:22:43 +00005747{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005748 conf->authmode = authmode;
Paul Bakker5121ce52009-01-03 21:22:43 +00005749}
5750
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005751#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005752void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnarde6ef16f2015-05-11 19:54:43 +02005753 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
Paul Bakkerb63b0af2011-01-13 17:54:59 +00005754 void *p_vrfy )
5755{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005756 conf->f_vrfy = f_vrfy;
5757 conf->p_vrfy = p_vrfy;
Paul Bakkerb63b0af2011-01-13 17:54:59 +00005758}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005759#endif /* MBEDTLS_X509_CRT_PARSE_C */
Paul Bakkerb63b0af2011-01-13 17:54:59 +00005760
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005761void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf,
Paul Bakkera3d195c2011-11-27 21:07:34 +00005762 int (*f_rng)(void *, unsigned char *, size_t),
Paul Bakker5121ce52009-01-03 21:22:43 +00005763 void *p_rng )
5764{
Manuel Pégourié-Gonnard750e4d72015-05-07 12:35:38 +01005765 conf->f_rng = f_rng;
5766 conf->p_rng = p_rng;
Paul Bakker5121ce52009-01-03 21:22:43 +00005767}
5768
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005769void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnardfd474232015-06-23 16:34:24 +02005770 void (*f_dbg)(void *, int, const char *, int, const char *),
Paul Bakker5121ce52009-01-03 21:22:43 +00005771 void *p_dbg )
5772{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005773 conf->f_dbg = f_dbg;
5774 conf->p_dbg = p_dbg;
Paul Bakker5121ce52009-01-03 21:22:43 +00005775}
5776
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005777void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnard8fa6dfd2014-09-17 10:47:43 +02005778 void *p_bio,
5779 int (*f_send)(void *, const unsigned char *, size_t),
5780 int (*f_recv)(void *, unsigned char *, size_t),
Manuel Pégourié-Gonnard97fd52c2015-05-06 15:38:52 +01005781 int (*f_recv_timeout)(void *, unsigned char *, size_t, uint32_t) )
Manuel Pégourié-Gonnard8fa6dfd2014-09-17 10:47:43 +02005782{
5783 ssl->p_bio = p_bio;
5784 ssl->f_send = f_send;
5785 ssl->f_recv = f_recv;
5786 ssl->f_recv_timeout = f_recv_timeout;
Manuel Pégourié-Gonnard97fd52c2015-05-06 15:38:52 +01005787}
5788
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005789void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout )
Manuel Pégourié-Gonnard97fd52c2015-05-06 15:38:52 +01005790{
5791 conf->read_timeout = timeout;
Manuel Pégourié-Gonnard8fa6dfd2014-09-17 10:47:43 +02005792}
5793
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +02005794void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl,
5795 void *p_timer,
5796 void (*f_set_timer)(void *, uint32_t int_ms, uint32_t fin_ms),
5797 int (*f_get_timer)(void *) )
5798{
5799 ssl->p_timer = p_timer;
5800 ssl->f_set_timer = f_set_timer;
5801 ssl->f_get_timer = f_get_timer;
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +02005802
5803 /* Make sure we start with no timer running */
5804 ssl_set_timer( ssl, 0 );
Manuel Pégourié-Gonnard2e012912015-05-12 20:55:41 +02005805}
5806
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005807#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005808void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard5cb33082015-05-06 18:06:26 +01005809 void *p_cache,
5810 int (*f_get_cache)(void *, mbedtls_ssl_session *),
5811 int (*f_set_cache)(void *, const mbedtls_ssl_session *) )
Paul Bakker5121ce52009-01-03 21:22:43 +00005812{
Manuel Pégourié-Gonnard5cb33082015-05-06 18:06:26 +01005813 conf->p_cache = p_cache;
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005814 conf->f_get_cache = f_get_cache;
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005815 conf->f_set_cache = f_set_cache;
Paul Bakker5121ce52009-01-03 21:22:43 +00005816}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005817#endif /* MBEDTLS_SSL_SRV_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00005818
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005819#if defined(MBEDTLS_SSL_CLI_C)
5820int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session )
Paul Bakker5121ce52009-01-03 21:22:43 +00005821{
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +02005822 int ret;
5823
5824 if( ssl == NULL ||
5825 session == NULL ||
5826 ssl->session_negotiate == NULL ||
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02005827 ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +02005828 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005829 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +02005830 }
5831
5832 if( ( ret = ssl_session_copy( ssl->session_negotiate, session ) ) != 0 )
5833 return( ret );
5834
Paul Bakker0a597072012-09-25 21:55:46 +00005835 ssl->handshake->resume = 1;
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +02005836
5837 return( 0 );
Paul Bakker5121ce52009-01-03 21:22:43 +00005838}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005839#endif /* MBEDTLS_SSL_CLI_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00005840
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005841void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005842 const int *ciphersuites )
Paul Bakker5121ce52009-01-03 21:22:43 +00005843{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005844 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites;
5845 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites;
5846 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites;
5847 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites;
Paul Bakker8f4ddae2013-04-15 15:09:54 +02005848}
5849
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005850void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf,
Paul Bakkerb9e4e2c2014-05-01 14:18:25 +02005851 const int *ciphersuites,
Paul Bakker8f4ddae2013-04-15 15:09:54 +02005852 int major, int minor )
5853{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005854 if( major != MBEDTLS_SSL_MAJOR_VERSION_3 )
Paul Bakker8f4ddae2013-04-15 15:09:54 +02005855 return;
5856
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005857 if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 )
Paul Bakker8f4ddae2013-04-15 15:09:54 +02005858 return;
5859
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02005860 conf->ciphersuite_list[minor] = ciphersuites;
Paul Bakker5121ce52009-01-03 21:22:43 +00005861}
5862
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005863#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard6e3ee3a2015-06-17 10:58:20 +02005864void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf,
Nicholas Wilson2088e2e2015-09-08 16:53:18 +01005865 const mbedtls_x509_crt_profile *profile )
Manuel Pégourié-Gonnard6e3ee3a2015-06-17 10:58:20 +02005866{
5867 conf->cert_profile = profile;
5868}
5869
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005870/* Append a new keycert entry to a (possibly empty) list */
5871static int ssl_append_key_cert( mbedtls_ssl_key_cert **head,
5872 mbedtls_x509_crt *cert,
5873 mbedtls_pk_context *key )
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005874{
niisato8ba6ff52018-06-25 19:05:48 +09005875 mbedtls_ssl_key_cert *new_cert;
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005876
niisato8ba6ff52018-06-25 19:05:48 +09005877 new_cert = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );
5878 if( new_cert == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02005879 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005880
niisato8ba6ff52018-06-25 19:05:48 +09005881 new_cert->cert = cert;
5882 new_cert->key = key;
5883 new_cert->next = NULL;
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005884
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005885 /* Update head is the list was null, else add to the end */
5886 if( *head == NULL )
Paul Bakker0333b972013-11-04 17:08:28 +01005887 {
niisato8ba6ff52018-06-25 19:05:48 +09005888 *head = new_cert;
Paul Bakker0333b972013-11-04 17:08:28 +01005889 }
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005890 else
5891 {
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005892 mbedtls_ssl_key_cert *cur = *head;
5893 while( cur->next != NULL )
5894 cur = cur->next;
niisato8ba6ff52018-06-25 19:05:48 +09005895 cur->next = new_cert;
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005896 }
5897
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005898 return( 0 );
5899}
5900
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005901int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard8f618a82015-05-10 21:13:36 +02005902 mbedtls_x509_crt *own_cert,
5903 mbedtls_pk_context *pk_key )
5904{
Manuel Pégourié-Gonnard17a40cd2015-05-10 23:17:17 +02005905 return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) );
Manuel Pégourié-Gonnard834ea852013-09-23 14:46:13 +02005906}
5907
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005908void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnardbc2b7712015-05-06 11:14:19 +01005909 mbedtls_x509_crt *ca_chain,
5910 mbedtls_x509_crl *ca_crl )
Paul Bakker5121ce52009-01-03 21:22:43 +00005911{
Manuel Pégourié-Gonnardbc2b7712015-05-06 11:14:19 +01005912 conf->ca_chain = ca_chain;
5913 conf->ca_crl = ca_crl;
Paul Bakker5121ce52009-01-03 21:22:43 +00005914}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005915#endif /* MBEDTLS_X509_CRT_PARSE_C */
Paul Bakkereb2c6582012-09-27 19:15:01 +00005916
Manuel Pégourié-Gonnard1af6c852015-05-10 23:10:37 +02005917#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
5918int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl,
5919 mbedtls_x509_crt *own_cert,
5920 mbedtls_pk_context *pk_key )
5921{
5922 return( ssl_append_key_cert( &ssl->handshake->sni_key_cert,
5923 own_cert, pk_key ) );
5924}
Manuel Pégourié-Gonnard22bfa4b2015-05-11 08:46:37 +02005925
5926void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl,
5927 mbedtls_x509_crt *ca_chain,
5928 mbedtls_x509_crl *ca_crl )
5929{
5930 ssl->handshake->sni_ca_chain = ca_chain;
5931 ssl->handshake->sni_ca_crl = ca_crl;
5932}
Manuel Pégourié-Gonnardcdc26ae2015-06-19 12:16:31 +02005933
5934void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl,
5935 int authmode )
5936{
5937 ssl->handshake->sni_authmode = authmode;
5938}
Manuel Pégourié-Gonnard1af6c852015-05-10 23:10:37 +02005939#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
5940
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005941#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02005942int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01005943 const unsigned char *psk, size_t psk_len,
5944 const unsigned char *psk_identity, size_t psk_identity_len )
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02005945{
Paul Bakker6db455e2013-09-18 17:29:31 +02005946 if( psk == NULL || psk_identity == NULL )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005947 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Paul Bakker6db455e2013-09-18 17:29:31 +02005948
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02005949 if( psk_len > MBEDTLS_PSK_MAX_LEN )
5950 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnardb2bf5a12014-03-25 16:28:12 +01005951
Manuel Pégourié-Gonnardc6b5d832015-08-27 16:37:35 +02005952 /* Identity len will be encoded on two bytes */
5953 if( ( psk_identity_len >> 16 ) != 0 ||
5954 psk_identity_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
5955 {
5956 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5957 }
5958
Andres Amaya Garcia3d231462017-07-05 14:25:21 +01005959 if( conf->psk != NULL )
Paul Bakker6db455e2013-09-18 17:29:31 +02005960 {
Andres Amaya Garcia1b7d6f82017-06-26 11:35:17 +01005961 mbedtls_zeroize( conf->psk, conf->psk_len );
Andres Amaya Garcia3d231462017-07-05 14:25:21 +01005962
Manuel Pégourié-Gonnard120fdbd2015-05-07 17:07:50 +01005963 mbedtls_free( conf->psk );
Manuel Pégourié-Gonnardffb81802015-10-20 19:56:45 +02005964 conf->psk = NULL;
Andres Amaya Garcia3d231462017-07-05 14:25:21 +01005965 conf->psk_len = 0;
5966 }
5967 if( conf->psk_identity != NULL )
5968 {
5969 mbedtls_free( conf->psk_identity );
Manuel Pégourié-Gonnardffb81802015-10-20 19:56:45 +02005970 conf->psk_identity = NULL;
Andres Amaya Garcia3d231462017-07-05 14:25:21 +01005971 conf->psk_identity_len = 0;
Paul Bakker6db455e2013-09-18 17:29:31 +02005972 }
5973
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02005974 if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ||
5975 ( conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ) ) == NULL )
Mansour Moufidf81088b2015-02-17 13:10:21 -05005976 {
Manuel Pégourié-Gonnard120fdbd2015-05-07 17:07:50 +01005977 mbedtls_free( conf->psk );
Manuel Pégourié-Gonnard24417f02015-09-28 18:09:45 +02005978 mbedtls_free( conf->psk_identity );
Manuel Pégourié-Gonnard120fdbd2015-05-07 17:07:50 +01005979 conf->psk = NULL;
Manuel Pégourié-Gonnard24417f02015-09-28 18:09:45 +02005980 conf->psk_identity = NULL;
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02005981 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Mansour Moufidf81088b2015-02-17 13:10:21 -05005982 }
Paul Bakker6db455e2013-09-18 17:29:31 +02005983
Manuel Pégourié-Gonnard120fdbd2015-05-07 17:07:50 +01005984 conf->psk_len = psk_len;
5985 conf->psk_identity_len = psk_identity_len;
Paul Bakker6db455e2013-09-18 17:29:31 +02005986
Manuel Pégourié-Gonnard120fdbd2015-05-07 17:07:50 +01005987 memcpy( conf->psk, psk, conf->psk_len );
5988 memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len );
Paul Bakker6db455e2013-09-18 17:29:31 +02005989
5990 return( 0 );
5991}
5992
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01005993int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
5994 const unsigned char *psk, size_t psk_len )
5995{
5996 if( psk == NULL || ssl->handshake == NULL )
5997 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5998
5999 if( psk_len > MBEDTLS_PSK_MAX_LEN )
6000 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6001
6002 if( ssl->handshake->psk != NULL )
Andres Amaya Garcia1b7d6f82017-06-26 11:35:17 +01006003 {
6004 mbedtls_zeroize( ssl->handshake->psk, ssl->handshake->psk_len );
Simon Butcher5b8d1d62015-10-04 22:06:51 +01006005 mbedtls_free( ssl->handshake->psk );
Andres Amaya Garcia3d231462017-07-05 14:25:21 +01006006 ssl->handshake->psk_len = 0;
Andres Amaya Garcia1b7d6f82017-06-26 11:35:17 +01006007 }
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01006008
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +02006009 if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +02006010 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01006011
6012 ssl->handshake->psk_len = psk_len;
6013 memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len );
6014
6015 return( 0 );
6016}
6017
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006018void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006019 int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
Paul Bakker6db455e2013-09-18 17:29:31 +02006020 size_t),
6021 void *p_psk )
6022{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006023 conf->f_psk = f_psk;
6024 conf->p_psk = p_psk;
Paul Bakkerd4a56ec2013-04-16 18:05:29 +02006025}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006026#endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
Paul Bakker43b7e352011-01-18 15:27:19 +00006027
Manuel Pégourié-Gonnardcf141ca2015-05-20 10:35:51 +02006028#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006029int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G )
Paul Bakker5121ce52009-01-03 21:22:43 +00006030{
6031 int ret;
6032
Manuel Pégourié-Gonnard1028b742015-05-06 17:33:07 +01006033 if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 ||
6034 ( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 )
6035 {
6036 mbedtls_mpi_free( &conf->dhm_P );
6037 mbedtls_mpi_free( &conf->dhm_G );
Paul Bakker5121ce52009-01-03 21:22:43 +00006038 return( ret );
Manuel Pégourié-Gonnard1028b742015-05-06 17:33:07 +01006039 }
Paul Bakker5121ce52009-01-03 21:22:43 +00006040
6041 return( 0 );
6042}
6043
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006044int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx )
Paul Bakker1b57b062011-01-06 15:48:19 +00006045{
6046 int ret;
6047
Manuel Pégourié-Gonnard1028b742015-05-06 17:33:07 +01006048 if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 ||
6049 ( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 )
6050 {
6051 mbedtls_mpi_free( &conf->dhm_P );
6052 mbedtls_mpi_free( &conf->dhm_G );
Paul Bakker1b57b062011-01-06 15:48:19 +00006053 return( ret );
Manuel Pégourié-Gonnard1028b742015-05-06 17:33:07 +01006054 }
Paul Bakker1b57b062011-01-06 15:48:19 +00006055
6056 return( 0 );
6057}
Manuel Pégourié-Gonnardcf141ca2015-05-20 10:35:51 +02006058#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */
Paul Bakker1b57b062011-01-06 15:48:19 +00006059
Manuel Pégourié-Gonnardbd990d62015-06-11 14:49:42 +02006060#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
6061/*
6062 * Set the minimum length for Diffie-Hellman parameters
6063 */
6064void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf,
6065 unsigned int bitlen )
6066{
6067 conf->dhm_min_bitlen = bitlen;
6068}
6069#endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
6070
Manuel Pégourié-Gonnardf9945bc2015-10-22 17:01:15 +02006071#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnard36a8b572015-06-17 12:43:26 +02006072/*
6073 * Set allowed/preferred hashes for handshake signatures
6074 */
6075void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf,
6076 const int *hashes )
6077{
6078 conf->sig_hashes = hashes;
6079}
Hanno Becker593b0d32017-04-07 13:25:49 +01006080#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
Manuel Pégourié-Gonnard36a8b572015-06-17 12:43:26 +02006081
Manuel Pégourié-Gonnardb541da62015-06-17 11:43:30 +02006082#if defined(MBEDTLS_ECP_C)
Manuel Pégourié-Gonnard7f38ed02014-02-04 15:52:33 +01006083/*
6084 * Set the allowed elliptic curves
6085 */
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006086void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006087 const mbedtls_ecp_group_id *curve_list )
Manuel Pégourié-Gonnard7f38ed02014-02-04 15:52:33 +01006088{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006089 conf->curve_list = curve_list;
Manuel Pégourié-Gonnard7f38ed02014-02-04 15:52:33 +01006090}
Hanno Becker593b0d32017-04-07 13:25:49 +01006091#endif /* MBEDTLS_ECP_C */
Manuel Pégourié-Gonnard7f38ed02014-02-04 15:52:33 +01006092
Manuel Pégourié-Gonnardbc2b7712015-05-06 11:14:19 +01006093#if defined(MBEDTLS_X509_CRT_PARSE_C)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006094int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname )
Paul Bakker5121ce52009-01-03 21:22:43 +00006095{
Hanno Becker593b0d32017-04-07 13:25:49 +01006096 /* Initialize to suppress unnecessary compiler warning */
6097 size_t hostname_len = 0;
6098
6099 /* Check if new hostname is valid before
6100 * making any change to current one */
6101
6102 if( hostname != NULL )
6103 {
6104 hostname_len = strlen( hostname );
6105
6106 if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN )
6107 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6108 }
6109
6110 /* Now it's clear that we will overwrite the old hostname,
6111 * so we can free it safely */
6112
6113 if( ssl->hostname != NULL )
6114 {
6115 mbedtls_zeroize( ssl->hostname, strlen( ssl->hostname ) );
6116 mbedtls_free( ssl->hostname );
6117 }
6118
6119 /* Passing NULL as hostname shall clear the old one */
Manuel Pégourié-Gonnardba26c242015-05-06 10:47:06 +01006120
Paul Bakker5121ce52009-01-03 21:22:43 +00006121 if( hostname == NULL )
Hanno Becker593b0d32017-04-07 13:25:49 +01006122 {
6123 ssl->hostname = NULL;
6124 }
6125 else
6126 {
6127 ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 );
Paul Bakker5121ce52009-01-03 21:22:43 +00006128
Hanno Becker593b0d32017-04-07 13:25:49 +01006129 if( ssl->hostname == NULL )
6130 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Paul Bakker75c1a6f2013-08-19 14:25:29 +02006131
Hanno Becker593b0d32017-04-07 13:25:49 +01006132 memcpy( ssl->hostname, hostname, hostname_len );
Paul Bakker75c1a6f2013-08-19 14:25:29 +02006133
Hanno Becker593b0d32017-04-07 13:25:49 +01006134 ssl->hostname[hostname_len] = '\0';
6135 }
Paul Bakker5121ce52009-01-03 21:22:43 +00006136
6137 return( 0 );
6138}
Hanno Beckerc7845e52017-04-07 13:02:16 +01006139#endif /* MBEDTLS_X509_CRT_PARSE_C */
Paul Bakker5121ce52009-01-03 21:22:43 +00006140
Manuel Pégourié-Gonnardbc2b7712015-05-06 11:14:19 +01006141#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006142void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006143 int (*f_sni)(void *, mbedtls_ssl_context *,
Paul Bakker5701cdc2012-09-27 21:49:42 +00006144 const unsigned char *, size_t),
6145 void *p_sni )
6146{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006147 conf->f_sni = f_sni;
6148 conf->p_sni = p_sni;
Paul Bakker5701cdc2012-09-27 21:49:42 +00006149}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006150#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
Paul Bakker5701cdc2012-09-27 21:49:42 +00006151
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006152#if defined(MBEDTLS_SSL_ALPN)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006153int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos )
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02006154{
Manuel Pégourié-Gonnard0b874dc2014-04-07 10:57:45 +02006155 size_t cur_len, tot_len;
6156 const char **p;
6157
6158 /*
Brian J Murraye7f8dc32016-11-06 04:45:15 -08006159 * RFC 7301 3.1: "Empty strings MUST NOT be included and byte strings
6160 * MUST NOT be truncated."
6161 * We check lengths now rather than later.
Manuel Pégourié-Gonnard0b874dc2014-04-07 10:57:45 +02006162 */
6163 tot_len = 0;
6164 for( p = protos; *p != NULL; p++ )
6165 {
6166 cur_len = strlen( *p );
6167 tot_len += cur_len;
6168
6169 if( cur_len == 0 || cur_len > 255 || tot_len > 65535 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006170 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard0b874dc2014-04-07 10:57:45 +02006171 }
6172
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006173 conf->alpn_list = protos;
Manuel Pégourié-Gonnard0b874dc2014-04-07 10:57:45 +02006174
6175 return( 0 );
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02006176}
6177
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006178const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02006179{
Paul Bakkerd8bb8262014-06-17 14:06:49 +02006180 return( ssl->alpn_chosen );
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02006181}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006182#endif /* MBEDTLS_SSL_ALPN */
Manuel Pégourié-Gonnard7e250d42014-04-04 16:08:41 +02006183
Manuel Pégourié-Gonnard01e5e8c2015-05-11 10:11:56 +02006184void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor )
Paul Bakker490ecc82011-10-06 13:04:09 +00006185{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006186 conf->max_major_ver = major;
6187 conf->max_minor_ver = minor;
Paul Bakker490ecc82011-10-06 13:04:09 +00006188}
6189
Manuel Pégourié-Gonnard01e5e8c2015-05-11 10:11:56 +02006190void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor )
Paul Bakker1d29fb52012-09-28 13:28:45 +00006191{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006192 conf->min_major_ver = major;
6193 conf->min_minor_ver = minor;
Paul Bakker1d29fb52012-09-28 13:28:45 +00006194}
6195
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006196#if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006197void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback )
Manuel Pégourié-Gonnard1cbd39d2014-10-20 13:34:59 +02006198{
Manuel Pégourié-Gonnard684b0592015-05-06 09:27:31 +01006199 conf->fallback = fallback;
Manuel Pégourié-Gonnard1cbd39d2014-10-20 13:34:59 +02006200}
6201#endif
6202
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006203#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006204void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm )
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01006205{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006206 conf->encrypt_then_mac = etm;
Manuel Pégourié-Gonnard699cafa2014-10-27 13:57:03 +01006207}
6208#endif
6209
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006210#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006211void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems )
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02006212{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006213 conf->extended_ms = ems;
Manuel Pégourié-Gonnard367381f2014-10-20 18:40:56 +02006214}
6215#endif
6216
Manuel Pégourié-Gonnard66dc5552015-05-14 12:28:21 +02006217#if defined(MBEDTLS_ARC4_C)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006218void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 )
Manuel Pégourié-Gonnardbd47a582015-01-12 13:43:29 +01006219{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006220 conf->arc4_disabled = arc4;
Manuel Pégourié-Gonnardbd47a582015-01-12 13:43:29 +01006221}
Manuel Pégourié-Gonnard66dc5552015-05-14 12:28:21 +02006222#endif
Manuel Pégourié-Gonnardbd47a582015-01-12 13:43:29 +01006223
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006224#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006225int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code )
Manuel Pégourié-Gonnard8b464592013-07-16 12:45:26 +02006226{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006227 if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ||
6228 mfl_code_to_length[mfl_code] > MBEDTLS_SSL_MAX_CONTENT_LEN )
Manuel Pégourié-Gonnard8b464592013-07-16 12:45:26 +02006229 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006230 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard8b464592013-07-16 12:45:26 +02006231 }
6232
Manuel Pégourié-Gonnard6bf89d62015-05-05 17:01:57 +01006233 conf->mfl_code = mfl_code;
Manuel Pégourié-Gonnard8b464592013-07-16 12:45:26 +02006234
6235 return( 0 );
6236}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006237#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
Manuel Pégourié-Gonnard8b464592013-07-16 12:45:26 +02006238
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006239#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
Manuel Pégourié-Gonnard01e5e8c2015-05-11 10:11:56 +02006240void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate )
Manuel Pégourié-Gonnarde980a992013-07-19 11:08:52 +02006241{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006242 conf->trunc_hmac = truncate;
Manuel Pégourié-Gonnarde980a992013-07-19 11:08:52 +02006243}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006244#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
Manuel Pégourié-Gonnarde980a992013-07-19 11:08:52 +02006245
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006246#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006247void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split )
Manuel Pégourié-Gonnardcfa477e2015-01-07 14:50:54 +01006248{
Manuel Pégourié-Gonnard17eab2b2015-05-05 16:34:53 +01006249 conf->cbc_record_splitting = split;
Manuel Pégourié-Gonnardcfa477e2015-01-07 14:50:54 +01006250}
6251#endif
6252
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006253void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy )
Paul Bakker48916f92012-09-16 19:57:18 +00006254{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006255 conf->allow_legacy_renegotiation = allow_legacy;
Paul Bakker48916f92012-09-16 19:57:18 +00006256}
6257
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006258#if defined(MBEDTLS_SSL_RENEGOTIATION)
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006259void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation )
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01006260{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006261 conf->disable_renegotiation = renegotiation;
Manuel Pégourié-Gonnard615e6772014-11-03 08:23:14 +01006262}
6263
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006264void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records )
Manuel Pégourié-Gonnarda9964db2014-07-03 19:29:16 +02006265{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006266 conf->renego_max_records = max_records;
Manuel Pégourié-Gonnarda9964db2014-07-03 19:29:16 +02006267}
6268
Manuel Pégourié-Gonnard6729e792015-05-11 09:50:24 +02006269void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnard837f0fe2014-11-05 13:58:53 +01006270 const unsigned char period[8] )
6271{
Manuel Pégourié-Gonnardd36e33f2015-05-05 10:45:39 +02006272 memcpy( conf->renego_period, period, 8 );
Manuel Pégourié-Gonnard837f0fe2014-11-05 13:58:53 +01006273}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006274#endif /* MBEDTLS_SSL_RENEGOTIATION */
Paul Bakker5121ce52009-01-03 21:22:43 +00006275
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006276#if defined(MBEDTLS_SSL_SESSION_TICKETS)
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +02006277#if defined(MBEDTLS_SSL_CLI_C)
6278void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets )
Manuel Pégourié-Gonnardaa0d4d12013-08-03 13:02:31 +02006279{
Manuel Pégourié-Gonnard2b494452015-05-06 10:05:11 +01006280 conf->session_tickets = use_tickets;
Manuel Pégourié-Gonnardaa0d4d12013-08-03 13:02:31 +02006281}
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +02006282#endif
Paul Bakker606b4ba2013-08-14 16:52:14 +02006283
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +02006284#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +02006285void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf,
6286 mbedtls_ssl_ticket_write_t *f_ticket_write,
6287 mbedtls_ssl_ticket_parse_t *f_ticket_parse,
6288 void *p_ticket )
Paul Bakker606b4ba2013-08-14 16:52:14 +02006289{
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +02006290 conf->f_ticket_write = f_ticket_write;
6291 conf->f_ticket_parse = f_ticket_parse;
6292 conf->p_ticket = p_ticket;
Paul Bakker606b4ba2013-08-14 16:52:14 +02006293}
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +02006294#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006295#endif /* MBEDTLS_SSL_SESSION_TICKETS */
Manuel Pégourié-Gonnardaa0d4d12013-08-03 13:02:31 +02006296
Paul Bakker5121ce52009-01-03 21:22:43 +00006297/*
6298 * SSL get accessors
6299 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006300size_t mbedtls_ssl_get_bytes_avail( const mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00006301{
6302 return( ssl->in_offt == NULL ? 0 : ssl->in_msglen );
6303}
6304
Manuel Pégourié-Gonnarde6ef16f2015-05-11 19:54:43 +02006305uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00006306{
Manuel Pégourié-Gonnarde89163c2015-01-23 14:30:57 +00006307 if( ssl->session != NULL )
6308 return( ssl->session->verify_result );
6309
6310 if( ssl->session_negotiate != NULL )
6311 return( ssl->session_negotiate->verify_result );
6312
Manuel Pégourié-Gonnard6ab9b002015-05-14 11:25:04 +02006313 return( 0xFFFFFFFF );
Paul Bakker5121ce52009-01-03 21:22:43 +00006314}
6315
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006316const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl )
Paul Bakker72f62662011-01-16 21:27:44 +00006317{
Paul Bakker926c8e42013-03-06 10:23:34 +01006318 if( ssl == NULL || ssl->session == NULL )
Paul Bakkerd8bb8262014-06-17 14:06:49 +02006319 return( NULL );
Paul Bakker926c8e42013-03-06 10:23:34 +01006320
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006321 return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite );
Paul Bakker72f62662011-01-16 21:27:44 +00006322}
6323
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006324const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl )
Paul Bakker43ca69c2011-01-15 17:35:19 +00006325{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006326#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006327 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardb21ca2a2014-02-10 13:43:33 +01006328 {
6329 switch( ssl->minor_ver )
6330 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006331 case MBEDTLS_SSL_MINOR_VERSION_2:
Manuel Pégourié-Gonnardb21ca2a2014-02-10 13:43:33 +01006332 return( "DTLSv1.0" );
6333
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006334 case MBEDTLS_SSL_MINOR_VERSION_3:
Manuel Pégourié-Gonnardb21ca2a2014-02-10 13:43:33 +01006335 return( "DTLSv1.2" );
6336
6337 default:
6338 return( "unknown (DTLS)" );
6339 }
6340 }
6341#endif
6342
Paul Bakker43ca69c2011-01-15 17:35:19 +00006343 switch( ssl->minor_ver )
6344 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006345 case MBEDTLS_SSL_MINOR_VERSION_0:
Paul Bakker43ca69c2011-01-15 17:35:19 +00006346 return( "SSLv3.0" );
6347
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006348 case MBEDTLS_SSL_MINOR_VERSION_1:
Paul Bakker43ca69c2011-01-15 17:35:19 +00006349 return( "TLSv1.0" );
6350
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006351 case MBEDTLS_SSL_MINOR_VERSION_2:
Paul Bakker43ca69c2011-01-15 17:35:19 +00006352 return( "TLSv1.1" );
6353
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006354 case MBEDTLS_SSL_MINOR_VERSION_3:
Paul Bakker1ef83d62012-04-11 12:09:53 +00006355 return( "TLSv1.2" );
6356
Paul Bakker43ca69c2011-01-15 17:35:19 +00006357 default:
Manuel Pégourié-Gonnardb21ca2a2014-02-10 13:43:33 +01006358 return( "unknown" );
Paul Bakker43ca69c2011-01-15 17:35:19 +00006359 }
Paul Bakker43ca69c2011-01-15 17:35:19 +00006360}
6361
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006362int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006363{
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02006364 size_t transform_expansion;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006365 const mbedtls_ssl_transform *transform = ssl->transform_out;
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006366
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006367#if defined(MBEDTLS_ZLIB_SUPPORT)
6368 if( ssl->session_out->compression != MBEDTLS_SSL_COMPRESS_NULL )
6369 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006370#endif
6371
6372 if( transform == NULL )
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02006373 return( (int) mbedtls_ssl_hdr_len( ssl ) );
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006374
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006375 switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) )
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006376 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006377 case MBEDTLS_MODE_GCM:
6378 case MBEDTLS_MODE_CCM:
6379 case MBEDTLS_MODE_STREAM:
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006380 transform_expansion = transform->minlen;
6381 break;
6382
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006383 case MBEDTLS_MODE_CBC:
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006384 transform_expansion = transform->maclen
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006385 + mbedtls_cipher_get_block_size( &transform->cipher_ctx_enc );
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006386 break;
6387
6388 default:
Manuel Pégourié-Gonnardcb0d2122015-07-22 11:52:11 +02006389 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006390 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006391 }
6392
Manuel Pégourié-Gonnard9de64f52015-07-01 15:51:43 +02006393 return( (int)( mbedtls_ssl_hdr_len( ssl ) + transform_expansion ) );
Manuel Pégourié-Gonnard9b35f182014-10-14 17:47:31 +02006394}
6395
Manuel Pégourié-Gonnarda2cda6b2015-08-31 18:30:52 +02006396#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
6397size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
6398{
6399 size_t max_len;
6400
6401 /*
6402 * Assume mfl_code is correct since it was checked when set
6403 */
6404 max_len = mfl_code_to_length[ssl->conf->mfl_code];
6405
6406 /*
6407 * Check if a smaller max length was negotiated
6408 */
6409 if( ssl->session_out != NULL &&
6410 mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
6411 {
6412 max_len = mfl_code_to_length[ssl->session_out->mfl_code];
6413 }
6414
6415 return max_len;
6416}
6417#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
6418
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006419#if defined(MBEDTLS_X509_CRT_PARSE_C)
6420const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
Paul Bakkerb0550d92012-10-30 07:51:03 +00006421{
6422 if( ssl == NULL || ssl->session == NULL )
Paul Bakkerd8bb8262014-06-17 14:06:49 +02006423 return( NULL );
Paul Bakkerb0550d92012-10-30 07:51:03 +00006424
Paul Bakkerd8bb8262014-06-17 14:06:49 +02006425 return( ssl->session->peer_cert );
Paul Bakkerb0550d92012-10-30 07:51:03 +00006426}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006427#endif /* MBEDTLS_X509_CRT_PARSE_C */
Paul Bakkerb0550d92012-10-30 07:51:03 +00006428
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006429#if defined(MBEDTLS_SSL_CLI_C)
6430int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl, mbedtls_ssl_session *dst )
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006431{
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006432 if( ssl == NULL ||
6433 dst == NULL ||
6434 ssl->session == NULL ||
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006435 ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006436 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006437 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006438 }
6439
Manuel Pégourié-Gonnard06650f62013-08-02 15:34:52 +02006440 return( ssl_session_copy( dst, ssl->session ) );
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006441}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006442#endif /* MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard74718032013-07-30 12:41:56 +02006443
Paul Bakker5121ce52009-01-03 21:22:43 +00006444/*
Paul Bakker1961b702013-01-25 14:49:24 +01006445 * Perform a single step of the SSL handshake
Paul Bakker5121ce52009-01-03 21:22:43 +00006446 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006447int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00006448{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006449 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Paul Bakker5121ce52009-01-03 21:22:43 +00006450
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02006451 if( ssl == NULL || ssl->conf == NULL )
6452 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6453
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006454#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006455 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006456 ret = mbedtls_ssl_handshake_client_step( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00006457#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006458#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006459 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006460 ret = mbedtls_ssl_handshake_server_step( ssl );
Paul Bakker5121ce52009-01-03 21:22:43 +00006461#endif
6462
Paul Bakker1961b702013-01-25 14:49:24 +01006463 return( ret );
6464}
6465
6466/*
6467 * Perform the SSL handshake
6468 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006469int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl )
Paul Bakker1961b702013-01-25 14:49:24 +01006470{
6471 int ret = 0;
6472
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02006473 if( ssl == NULL || ssl->conf == NULL )
6474 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6475
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006476 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
Paul Bakker1961b702013-01-25 14:49:24 +01006477
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006478 while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
Paul Bakker1961b702013-01-25 14:49:24 +01006479 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006480 ret = mbedtls_ssl_handshake_step( ssl );
Paul Bakker1961b702013-01-25 14:49:24 +01006481
6482 if( ret != 0 )
6483 break;
6484 }
6485
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006486 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00006487
6488 return( ret );
6489}
6490
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006491#if defined(MBEDTLS_SSL_RENEGOTIATION)
6492#if defined(MBEDTLS_SSL_SRV_C)
Paul Bakker5121ce52009-01-03 21:22:43 +00006493/*
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006494 * Write HelloRequest to request renegotiation on server
Paul Bakker48916f92012-09-16 19:57:18 +00006495 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006496static int ssl_write_hello_request( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006497{
6498 int ret;
6499
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006500 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) );
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006501
6502 ssl->out_msglen = 4;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006503 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
6504 ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST;
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006505
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006506 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006507 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006508 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006509 return( ret );
6510 }
6511
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006512 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) );
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006513
6514 return( 0 );
6515}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006516#endif /* MBEDTLS_SSL_SRV_C */
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006517
6518/*
6519 * Actually renegotiate current connection, triggered by either:
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006520 * - any side: calling mbedtls_ssl_renegotiate(),
6521 * - client: receiving a HelloRequest during mbedtls_ssl_read(),
6522 * - server: receiving any handshake message on server during mbedtls_ssl_read() after
Manuel Pégourié-Gonnard55e4ff22014-08-19 11:16:35 +02006523 * the initial handshake is completed.
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006524 * If the handshake doesn't complete due to waiting for I/O, it will continue
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006525 * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively.
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006526 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006527static int ssl_start_renegotiation( mbedtls_ssl_context *ssl )
Paul Bakker48916f92012-09-16 19:57:18 +00006528{
6529 int ret;
6530
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006531 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00006532
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006533 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
6534 return( ret );
Paul Bakker48916f92012-09-16 19:57:18 +00006535
Manuel Pégourié-Gonnard0557bd52014-08-19 19:18:39 +02006536 /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and
6537 * the ServerHello will have message_seq = 1" */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006538#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006539 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006540 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
Manuel Pégourié-Gonnard0557bd52014-08-19 19:18:39 +02006541 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006542 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard1aa586e2014-09-03 12:54:04 +02006543 ssl->handshake->out_msg_seq = 1;
6544 else
6545 ssl->handshake->in_msg_seq = 1;
Manuel Pégourié-Gonnard0557bd52014-08-19 19:18:39 +02006546 }
6547#endif
6548
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006549 ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
6550 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS;
Paul Bakker48916f92012-09-16 19:57:18 +00006551
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006552 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
Paul Bakker48916f92012-09-16 19:57:18 +00006553 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006554 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
Paul Bakker48916f92012-09-16 19:57:18 +00006555 return( ret );
6556 }
6557
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006558 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00006559
6560 return( 0 );
6561}
6562
6563/*
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006564 * Renegotiate current connection on client,
6565 * or request renegotiation on server
6566 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006567int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006568{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006569 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006570
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02006571 if( ssl == NULL || ssl->conf == NULL )
6572 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6573
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006574#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006575 /* On server, just send the request */
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006576 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006577 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006578 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6579 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006580
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006581 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
Manuel Pégourié-Gonnardf07f4212014-08-15 19:04:47 +02006582
6583 /* Did we already try/start sending HelloRequest? */
6584 if( ssl->out_left != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006585 return( mbedtls_ssl_flush_output( ssl ) );
Manuel Pégourié-Gonnardf07f4212014-08-15 19:04:47 +02006586
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006587 return( ssl_write_hello_request( ssl ) );
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006588 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006589#endif /* MBEDTLS_SSL_SRV_C */
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006590
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006591#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006592 /*
6593 * On client, either start the renegotiation process or,
6594 * if already in progress, continue the handshake
6595 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006596 if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006597 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006598 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6599 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006600
6601 if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 )
6602 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006603 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006604 return( ret );
6605 }
6606 }
6607 else
6608 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006609 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006610 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006611 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006612 return( ret );
6613 }
6614 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006615#endif /* MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard9c1e1892013-10-30 16:41:21 +01006616
Paul Bakker37ce0ff2013-10-31 14:32:04 +01006617 return( ret );
Manuel Pégourié-Gonnard214eed32013-10-30 13:06:54 +01006618}
6619
6620/*
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006621 * Check record counters and renegotiate if they're above the limit.
6622 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006623static int ssl_check_ctr_renegotiate( mbedtls_ssl_context *ssl )
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006624{
Andres AG7fa66d42016-12-15 17:01:16 +00006625 size_t ep_len = ssl_ep_len( ssl );
6626 int in_ctr_cmp;
6627 int out_ctr_cmp;
6628
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006629 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ||
6630 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ||
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006631 ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED )
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006632 {
6633 return( 0 );
6634 }
6635
Andres AG7fa66d42016-12-15 17:01:16 +00006636 in_ctr_cmp = memcmp( ssl->in_ctr + ep_len,
6637 ssl->conf->renego_period + ep_len, 8 - ep_len );
6638 out_ctr_cmp = memcmp( ssl->out_ctr + ep_len,
6639 ssl->conf->renego_period + ep_len, 8 - ep_len );
6640
6641 if( in_ctr_cmp <= 0 && out_ctr_cmp <= 0 )
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006642 {
6643 return( 0 );
6644 }
6645
Manuel Pégourié-Gonnardcb0d2122015-07-22 11:52:11 +02006646 MBEDTLS_SSL_DEBUG_MSG( 1, ( "record counter limit reached: renegotiate" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006647 return( mbedtls_ssl_renegotiate( ssl ) );
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006648}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006649#endif /* MBEDTLS_SSL_RENEGOTIATION */
Paul Bakker5121ce52009-01-03 21:22:43 +00006650
6651/*
6652 * Receive application data decrypted from the SSL layer
6653 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006654int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
Paul Bakker5121ce52009-01-03 21:22:43 +00006655{
Hanno Becker6a582e82017-06-08 13:38:05 +01006656 int ret;
Paul Bakker23986e52011-04-24 08:57:21 +00006657 size_t n;
Paul Bakker5121ce52009-01-03 21:22:43 +00006658
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02006659 if( ssl == NULL || ssl->conf == NULL )
6660 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6661
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006662 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00006663
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006664#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006665 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02006666 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006667 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02006668 return( ret );
6669
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006670 if( ssl->handshake != NULL &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006671 ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006672 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006673 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006674 return( ret );
6675 }
Manuel Pégourié-Gonnardabf16242014-09-23 09:42:16 +02006676 }
6677#endif
6678
Hanno Becker6a582e82017-06-08 13:38:05 +01006679 /*
6680 * Check if renegotiation is necessary and/or handshake is
6681 * in process. If yes, perform/continue, and fall through
6682 * if an unexpected packet is received while the client
6683 * is waiting for the ServerHello.
6684 *
6685 * (There is no equivalent to the last condition on
6686 * the server-side as it is not treated as within
6687 * a handshake while waiting for the ClientHello
6688 * after a renegotiation request.)
6689 */
6690
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006691#if defined(MBEDTLS_SSL_RENEGOTIATION)
Hanno Becker6a582e82017-06-08 13:38:05 +01006692 ret = ssl_check_ctr_renegotiate( ssl );
6693 if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
6694 ret != 0 )
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006695 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006696 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
Manuel Pégourié-Gonnardb4458052014-11-04 21:04:22 +01006697 return( ret );
6698 }
6699#endif
6700
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006701 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
Paul Bakker5121ce52009-01-03 21:22:43 +00006702 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006703 ret = mbedtls_ssl_handshake( ssl );
Hanno Becker6a582e82017-06-08 13:38:05 +01006704 if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
6705 ret != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00006706 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006707 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00006708 return( ret );
6709 }
6710 }
6711
6712 if( ssl->in_offt == NULL )
6713 {
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02006714 /* Start timer if not already running */
Manuel Pégourié-Gonnard545102e2015-05-13 17:28:43 +02006715 if( ssl->f_get_timer != NULL &&
6716 ssl->f_get_timer( ssl->p_timer ) == -1 )
6717 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006718 ssl_set_timer( ssl, ssl->conf->read_timeout );
Manuel Pégourié-Gonnard545102e2015-05-13 17:28:43 +02006719 }
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02006720
Hanno Becker6a582e82017-06-08 13:38:05 +01006721 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00006722 {
Hanno Becker6a582e82017-06-08 13:38:05 +01006723 if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
6724 return( 0 );
Paul Bakker831a7552011-05-18 13:32:51 +00006725
Hanno Becker6a582e82017-06-08 13:38:05 +01006726 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
6727 return( ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00006728 }
6729
6730 if( ssl->in_msglen == 0 &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006731 ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA )
Paul Bakker5121ce52009-01-03 21:22:43 +00006732 {
6733 /*
6734 * OpenSSL sends empty messages to randomize the IV
6735 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006736 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00006737 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006738 if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
Paul Bakker831a7552011-05-18 13:32:51 +00006739 return( 0 );
6740
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006741 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00006742 return( ret );
6743 }
6744 }
6745
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006746 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
Paul Bakker48916f92012-09-16 19:57:18 +00006747 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006748 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received handshake message" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00006749
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006750#if defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006751 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006752 ( ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST ||
6753 ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) ) )
Paul Bakker48916f92012-09-16 19:57:18 +00006754 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006755 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) );
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006756
6757 /* With DTLS, drop the packet (probably from last handshake) */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006758#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006759 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01006760 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006761#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006762 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006763 }
Hanno Becker6a582e82017-06-08 13:38:05 +01006764#endif /* MBEDTLS_SSL_CLI_C */
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006765
Hanno Becker6a582e82017-06-08 13:38:05 +01006766#if defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006767 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006768 ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006769 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006770 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not ClientHello)" ) );
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006771
6772 /* With DTLS, drop the packet (probably from last handshake) */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006773#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006774 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01006775 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnard990f9e42014-09-06 12:27:02 +02006776#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006777 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker48916f92012-09-16 19:57:18 +00006778 }
Manuel Pégourié-Gonnardd16d1cb2014-11-20 18:15:05 +01006779#endif
Paul Bakker48916f92012-09-16 19:57:18 +00006780
Hanno Becker3cd07be2017-10-24 11:49:19 +01006781#if defined(MBEDTLS_SSL_RENEGOTIATION)
Hanno Beckere454d732017-10-24 11:47:37 +01006782 if( ! ( ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED ||
6783 ( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
6784 ssl->conf->allow_legacy_renegotiation ==
6785 MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) ) )
6786 {
6787 /* DTLS clients need to know renego is server-initiated */
6788#if defined(MBEDTLS_SSL_PROTO_DTLS)
6789 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
6790 ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
6791 {
6792 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
6793 }
6794#endif
6795 ret = ssl_start_renegotiation( ssl );
6796 if( ret != MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO &&
6797 ret != 0 )
6798 {
6799 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
6800 return( ret );
6801 }
6802 }
6803 else
Hanno Becker3cd07be2017-10-24 11:49:19 +01006804#endif /* MBEDTLS_SSL_RENEGOTIATION */
Paul Bakker48916f92012-09-16 19:57:18 +00006805 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006806 MBEDTLS_SSL_DEBUG_MSG( 3, ( "refusing renegotiation, sending alert" ) );
Paul Bakker48916f92012-09-16 19:57:18 +00006807
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006808#if defined(MBEDTLS_SSL_PROTO_SSL3)
6809 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
Paul Bakker48916f92012-09-16 19:57:18 +00006810 {
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00006811 /*
6812 * SSLv3 does not have a "no_renegotiation" alert
6813 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006814 if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00006815 return( ret );
6816 }
6817 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006818#endif /* MBEDTLS_SSL_PROTO_SSL3 */
6819#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
6820 defined(MBEDTLS_SSL_PROTO_TLS1_2)
6821 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00006822 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006823 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
6824 MBEDTLS_SSL_ALERT_LEVEL_WARNING,
6825 MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 )
Paul Bakkerd0f6fa72012-09-17 09:18:12 +00006826 {
6827 return( ret );
6828 }
Paul Bakker48916f92012-09-16 19:57:18 +00006829 }
Paul Bakkerd2f068e2013-08-27 21:19:20 +02006830 else
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006831#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 ||
6832 MBEDTLS_SSL_PROTO_TLS1_2 */
Paul Bakker577e0062013-08-28 11:57:20 +02006833 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006834 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
6835 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
Paul Bakker577e0062013-08-28 11:57:20 +02006836 }
Paul Bakker48916f92012-09-16 19:57:18 +00006837 }
Manuel Pégourié-Gonnardf26a1e82014-08-19 12:28:50 +02006838
Hanno Becker6a582e82017-06-08 13:38:05 +01006839 return( MBEDTLS_ERR_SSL_WANT_READ );
Paul Bakker48916f92012-09-16 19:57:18 +00006840 }
Hanno Becker3cd07be2017-10-24 11:49:19 +01006841#if defined(MBEDTLS_SSL_RENEGOTIATION)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006842 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
Manuel Pégourié-Gonnard6d8404d2013-10-30 16:41:45 +01006843 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006844 if( ssl->conf->renego_max_records >= 0 )
Manuel Pégourié-Gonnarda9964db2014-07-03 19:29:16 +02006845 {
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006846 if( ++ssl->renego_records_seen > ssl->conf->renego_max_records )
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02006847 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006848 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, "
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02006849 "but not honored by client" ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006850 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02006851 }
Manuel Pégourié-Gonnarda9964db2014-07-03 19:29:16 +02006852 }
Manuel Pégourié-Gonnard6d8404d2013-10-30 16:41:45 +01006853 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006854#endif /* MBEDTLS_SSL_RENEGOTIATION */
Manuel Pégourié-Gonnardf26a1e82014-08-19 12:28:50 +02006855
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006856 /* Fatal and closure alerts handled by mbedtls_ssl_read_record() */
6857 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
Manuel Pégourié-Gonnardf26a1e82014-08-19 12:28:50 +02006858 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006859 MBEDTLS_SSL_DEBUG_MSG( 2, ( "ignoring non-fatal non-closure alert" ) );
Manuel Pégourié-Gonnard88369942015-05-06 16:19:31 +01006860 return( MBEDTLS_ERR_SSL_WANT_READ );
Manuel Pégourié-Gonnardf26a1e82014-08-19 12:28:50 +02006861 }
6862
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006863 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
Paul Bakker5121ce52009-01-03 21:22:43 +00006864 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006865 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad application data message" ) );
6866 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
Paul Bakker5121ce52009-01-03 21:22:43 +00006867 }
6868
6869 ssl->in_offt = ssl->in_msg;
Manuel Pégourié-Gonnard6b651412014-10-01 18:29:03 +02006870
Manuel Pégourié-Gonnardba958b82014-10-09 16:13:44 +02006871 /* We're going to return something now, cancel timer,
6872 * except if handshake (renegotiation) is in progress */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006873 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
Manuel Pégourié-Gonnardba958b82014-10-09 16:13:44 +02006874 ssl_set_timer( ssl, 0 );
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006875
Manuel Pégourié-Gonnard286a1362015-05-13 16:22:05 +02006876#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006877 /* If we requested renego but received AppData, resend HelloRequest.
6878 * Do it now, after setting in_offt, to avoid taking this branch
6879 * again if ssl_write_hello_request() returns WANT_WRITE */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006880#if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006881 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006882 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006883 {
Manuel Pégourié-Gonnarddf3acd82014-10-15 15:07:45 +02006884 if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006885 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006886 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
Manuel Pégourié-Gonnard26a4cf62014-10-15 13:52:48 +02006887 return( ret );
6888 }
6889 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006890#endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
Manuel Pégourié-Gonnardf1e9b092014-10-02 18:08:53 +02006891#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00006892 }
6893
6894 n = ( len < ssl->in_msglen )
6895 ? len : ssl->in_msglen;
6896
6897 memcpy( buf, ssl->in_offt, n );
6898 ssl->in_msglen -= n;
6899
6900 if( ssl->in_msglen == 0 )
Hanno Beckercc019082017-06-09 10:51:37 +01006901 {
Paul Bakker5121ce52009-01-03 21:22:43 +00006902 /* all bytes consumed */
6903 ssl->in_offt = NULL;
Hanno Beckercc019082017-06-09 10:51:37 +01006904 ssl->keep_current_message = 0;
6905 }
Paul Bakker5121ce52009-01-03 21:22:43 +00006906 else
6907 /* more data available */
6908 ssl->in_offt += n;
6909
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006910 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00006911
Paul Bakker23986e52011-04-24 08:57:21 +00006912 return( (int) n );
Paul Bakker5121ce52009-01-03 21:22:43 +00006913}
6914
6915/*
Andres Amaya Garciab999a732017-09-28 14:41:17 +01006916 * Send application data to be encrypted by the SSL layer, taking care of max
6917 * fragment length and buffer size.
6918 *
6919 * According to RFC 5246 Section 6.2.1:
6920 *
6921 * Zero-length fragments of Application data MAY be sent as they are
6922 * potentially useful as a traffic analysis countermeasure.
6923 *
6924 * Therefore, it is possible that the input message length is 0 and the
6925 * corresponding return code is 0 on success.
Paul Bakker5121ce52009-01-03 21:22:43 +00006926 */
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02006927static int ssl_write_real( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02006928 const unsigned char *buf, size_t len )
Paul Bakker5121ce52009-01-03 21:22:43 +00006929{
Paul Bakker23986e52011-04-24 08:57:21 +00006930 int ret;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006931#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
Manuel Pégourié-Gonnarda2cda6b2015-08-31 18:30:52 +02006932 size_t max_len = mbedtls_ssl_get_max_frag_len( ssl );
Florina3604112017-07-22 09:01:44 +02006933#else
6934 size_t max_len = MBEDTLS_SSL_MAX_CONTENT_LEN;
6935#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02006936 if( len > max_len )
6937 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006938#if defined(MBEDTLS_SSL_PROTO_DTLS)
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02006939 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02006940 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006941 MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment larger than the (negotiated) "
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02006942 "maximum fragment length: %d > %d",
6943 len, max_len ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006944 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02006945 }
6946 else
6947#endif
6948 len = max_len;
6949 }
Paul Bakker887bd502011-06-08 13:10:54 +00006950
Paul Bakker5121ce52009-01-03 21:22:43 +00006951 if( ssl->out_left != 0 )
6952 {
Andres Amaya Garciab999a732017-09-28 14:41:17 +01006953 /*
6954 * The user has previously tried to send the data and
6955 * MBEDTLS_ERR_SSL_WANT_WRITE or the message was only partially
6956 * written. In this case, we expect the high-level write function
6957 * (e.g. mbedtls_ssl_write()) to be called with the same parameters
6958 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006959 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00006960 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006961 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00006962 return( ret );
6963 }
6964 }
Paul Bakker887bd502011-06-08 13:10:54 +00006965 else
Paul Bakker1fd00bf2011-03-14 20:50:15 +00006966 {
Andres Amaya Garciab999a732017-09-28 14:41:17 +01006967 /*
6968 * The user is trying to send a message the first time, so we need to
6969 * copy the data into the internal buffers and setup the data structure
6970 * to keep track of partial writes
6971 */
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02006972 ssl->out_msglen = len;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006973 ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA;
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02006974 memcpy( ssl->out_msg, buf, len );
Paul Bakker887bd502011-06-08 13:10:54 +00006975
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006976 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
Paul Bakker887bd502011-06-08 13:10:54 +00006977 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006978 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
Paul Bakker887bd502011-06-08 13:10:54 +00006979 return( ret );
6980 }
Paul Bakker5121ce52009-01-03 21:22:43 +00006981 }
6982
Manuel Pégourié-Gonnard37e08e12014-10-13 17:55:52 +02006983 return( (int) len );
Paul Bakker5121ce52009-01-03 21:22:43 +00006984}
6985
6986/*
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01006987 * Write application data, doing 1/n-1 splitting if necessary.
6988 *
6989 * With non-blocking I/O, ssl_write_real() may return WANT_WRITE,
Manuel Pégourié-Gonnardcfa477e2015-01-07 14:50:54 +01006990 * then the caller will call us again with the same arguments, so
Hanno Beckere298c8b2017-09-18 14:58:11 +01006991 * remember whether we already did the split or not.
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01006992 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02006993#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02006994static int ssl_write_split( mbedtls_ssl_context *ssl,
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02006995 const unsigned char *buf, size_t len )
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01006996{
6997 int ret;
6998
Manuel Pégourié-Gonnard17eab2b2015-05-05 16:34:53 +01006999 if( ssl->conf->cbc_record_splitting ==
7000 MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED ||
Manuel Pégourié-Gonnardcfa477e2015-01-07 14:50:54 +01007001 len <= 1 ||
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007002 ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_1 ||
7003 mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc )
7004 != MBEDTLS_MODE_CBC )
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007005 {
7006 return( ssl_write_real( ssl, buf, len ) );
7007 }
7008
7009 if( ssl->split_done == 0 )
7010 {
Manuel Pégourié-Gonnarda852cf42015-01-13 20:56:15 +01007011 if( ( ret = ssl_write_real( ssl, buf, 1 ) ) <= 0 )
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007012 return( ret );
Manuel Pégourié-Gonnarda852cf42015-01-13 20:56:15 +01007013 ssl->split_done = 1;
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007014 }
7015
Manuel Pégourié-Gonnarda852cf42015-01-13 20:56:15 +01007016 if( ( ret = ssl_write_real( ssl, buf + 1, len - 1 ) ) <= 0 )
7017 return( ret );
7018 ssl->split_done = 0;
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007019
7020 return( ret + 1 );
7021}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007022#endif /* MBEDTLS_SSL_CBC_RECORD_SPLITTING */
Manuel Pégourié-Gonnardd76314c2015-01-07 12:39:44 +01007023
7024/*
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007025 * Write application data (public-facing wrapper)
7026 */
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007027int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len )
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007028{
7029 int ret;
7030
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007031 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) );
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007032
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02007033 if( ssl == NULL || ssl->conf == NULL )
7034 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
7035
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007036#if defined(MBEDTLS_SSL_RENEGOTIATION)
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007037 if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
7038 {
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007039 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007040 return( ret );
7041 }
7042#endif
7043
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007044 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007045 {
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007046 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007047 {
Manuel Pégourié-Gonnard151dc772015-05-14 13:55:51 +02007048 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007049 return( ret );
7050 }
7051 }
7052
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007053#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007054 ret = ssl_write_split( ssl, buf, len );
7055#else
7056 ret = ssl_write_real( ssl, buf, len );
7057#endif
7058
Manuel Pégourié-Gonnard144bc222015-04-17 20:39:07 +02007059 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write" ) );
Manuel Pégourié-Gonnarda2fce212015-04-15 19:09:03 +02007060
7061 return( ret );
7062}
7063
7064/*
Paul Bakker5121ce52009-01-03 21:22:43 +00007065 * Notify the peer that the connection is being closed
7066 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007067int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00007068{
7069 int ret;
7070
Manuel Pégourié-Gonnardf81ee2e2015-09-01 17:43:40 +02007071 if( ssl == NULL || ssl->conf == NULL )
7072 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
7073
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007074 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write close notify" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007075
Manuel Pégourié-Gonnarda13500f2014-08-19 16:14:04 +02007076 if( ssl->out_left != 0 )
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007077 return( mbedtls_ssl_flush_output( ssl ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007078
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007079 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
Paul Bakker5121ce52009-01-03 21:22:43 +00007080 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007081 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
7082 MBEDTLS_SSL_ALERT_LEVEL_WARNING,
7083 MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 )
Paul Bakker5121ce52009-01-03 21:22:43 +00007084 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007085 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_send_alert_message", ret );
Paul Bakker5121ce52009-01-03 21:22:43 +00007086 return( ret );
7087 }
7088 }
7089
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007090 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write close notify" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007091
Manuel Pégourié-Gonnarda13500f2014-08-19 16:14:04 +02007092 return( 0 );
Paul Bakker5121ce52009-01-03 21:22:43 +00007093}
7094
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007095void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform )
Paul Bakker48916f92012-09-16 19:57:18 +00007096{
Paul Bakkeraccaffe2014-06-26 13:37:14 +02007097 if( transform == NULL )
7098 return;
7099
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007100#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker48916f92012-09-16 19:57:18 +00007101 deflateEnd( &transform->ctx_deflate );
7102 inflateEnd( &transform->ctx_inflate );
7103#endif
7104
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007105 mbedtls_cipher_free( &transform->cipher_ctx_enc );
7106 mbedtls_cipher_free( &transform->cipher_ctx_dec );
Manuel Pégourié-Gonnardf71e5872013-09-23 17:12:43 +02007107
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007108 mbedtls_md_free( &transform->md_ctx_enc );
7109 mbedtls_md_free( &transform->md_ctx_dec );
Paul Bakker61d113b2013-07-04 11:51:43 +02007110
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007111 mbedtls_zeroize( transform, sizeof( mbedtls_ssl_transform ) );
Paul Bakker48916f92012-09-16 19:57:18 +00007112}
7113
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007114#if defined(MBEDTLS_X509_CRT_PARSE_C)
7115static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert )
Manuel Pégourié-Gonnard705fcca2013-09-23 20:04:20 +02007116{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007117 mbedtls_ssl_key_cert *cur = key_cert, *next;
Manuel Pégourié-Gonnard705fcca2013-09-23 20:04:20 +02007118
7119 while( cur != NULL )
7120 {
7121 next = cur->next;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007122 mbedtls_free( cur );
Manuel Pégourié-Gonnard705fcca2013-09-23 20:04:20 +02007123 cur = next;
7124 }
7125}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007126#endif /* MBEDTLS_X509_CRT_PARSE_C */
Manuel Pégourié-Gonnard705fcca2013-09-23 20:04:20 +02007127
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007128void mbedtls_ssl_handshake_free( mbedtls_ssl_handshake_params *handshake )
Paul Bakker48916f92012-09-16 19:57:18 +00007129{
Paul Bakkeraccaffe2014-06-26 13:37:14 +02007130 if( handshake == NULL )
7131 return;
7132
Manuel Pégourié-Gonnardb9d64e52015-07-06 14:18:56 +02007133#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
7134 defined(MBEDTLS_SSL_PROTO_TLS1_1)
7135 mbedtls_md5_free( &handshake->fin_md5 );
7136 mbedtls_sha1_free( &handshake->fin_sha1 );
7137#endif
7138#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
7139#if defined(MBEDTLS_SHA256_C)
7140 mbedtls_sha256_free( &handshake->fin_sha256 );
7141#endif
7142#if defined(MBEDTLS_SHA512_C)
7143 mbedtls_sha512_free( &handshake->fin_sha512 );
7144#endif
7145#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
7146
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007147#if defined(MBEDTLS_DHM_C)
7148 mbedtls_dhm_free( &handshake->dhm_ctx );
Paul Bakker48916f92012-09-16 19:57:18 +00007149#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007150#if defined(MBEDTLS_ECDH_C)
7151 mbedtls_ecdh_free( &handshake->ecdh_ctx );
Paul Bakker61d113b2013-07-04 11:51:43 +02007152#endif
7153
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007154#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
Paul Bakker9af723c2014-05-01 13:03:14 +02007155 /* explicit void pointer cast for buggy MS compiler */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007156 mbedtls_free( (void *) handshake->curves );
Manuel Pégourié-Gonnardd09453c2013-09-23 19:11:32 +02007157#endif
7158
Manuel Pégourié-Gonnard4b682962015-05-07 15:59:54 +01007159#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
7160 if( handshake->psk != NULL )
7161 {
7162 mbedtls_zeroize( handshake->psk, handshake->psk_len );
7163 mbedtls_free( handshake->psk );
7164 }
7165#endif
7166
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007167#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
7168 defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
Manuel Pégourié-Gonnard83724542013-09-24 22:30:56 +02007169 /*
7170 * Free only the linked list wrapper, not the keys themselves
7171 * since the belong to the SNI callback
7172 */
7173 if( handshake->sni_key_cert != NULL )
7174 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007175 mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next;
Manuel Pégourié-Gonnard83724542013-09-24 22:30:56 +02007176
7177 while( cur != NULL )
7178 {
7179 next = cur->next;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007180 mbedtls_free( cur );
Manuel Pégourié-Gonnard83724542013-09-24 22:30:56 +02007181 cur = next;
7182 }
7183 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007184#endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */
Manuel Pégourié-Gonnard705fcca2013-09-23 20:04:20 +02007185
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007186#if defined(MBEDTLS_SSL_PROTO_DTLS)
7187 mbedtls_free( handshake->verify_cookie );
7188 mbedtls_free( handshake->hs_msg );
Manuel Pégourié-Gonnardffa67be2014-09-19 11:18:57 +02007189 ssl_flight_free( handshake->flight );
Manuel Pégourié-Gonnard74848812014-07-11 02:43:49 +02007190#endif
7191
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007192 mbedtls_zeroize( handshake, sizeof( mbedtls_ssl_handshake_params ) );
Paul Bakker48916f92012-09-16 19:57:18 +00007193}
7194
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007195void mbedtls_ssl_session_free( mbedtls_ssl_session *session )
Paul Bakker48916f92012-09-16 19:57:18 +00007196{
Paul Bakkeraccaffe2014-06-26 13:37:14 +02007197 if( session == NULL )
7198 return;
7199
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007200#if defined(MBEDTLS_X509_CRT_PARSE_C)
Paul Bakker0a597072012-09-25 21:55:46 +00007201 if( session->peer_cert != NULL )
Paul Bakker48916f92012-09-16 19:57:18 +00007202 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007203 mbedtls_x509_crt_free( session->peer_cert );
7204 mbedtls_free( session->peer_cert );
Paul Bakker48916f92012-09-16 19:57:18 +00007205 }
Paul Bakkered27a042013-04-18 22:46:23 +02007206#endif
Paul Bakker0a597072012-09-25 21:55:46 +00007207
Manuel Pégourié-Gonnardb596abf2015-05-20 10:45:29 +02007208#if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007209 mbedtls_free( session->ticket );
Paul Bakkera503a632013-08-14 13:48:06 +02007210#endif
Manuel Pégourié-Gonnard75d44012013-08-02 14:44:04 +02007211
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007212 mbedtls_zeroize( session, sizeof( mbedtls_ssl_session ) );
Paul Bakker48916f92012-09-16 19:57:18 +00007213}
7214
Paul Bakker5121ce52009-01-03 21:22:43 +00007215/*
7216 * Free an SSL context
7217 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007218void mbedtls_ssl_free( mbedtls_ssl_context *ssl )
Paul Bakker5121ce52009-01-03 21:22:43 +00007219{
Paul Bakkeraccaffe2014-06-26 13:37:14 +02007220 if( ssl == NULL )
7221 return;
7222
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007223 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007224
Manuel Pégourié-Gonnard7ee6f0e2014-02-13 10:54:07 +01007225 if( ssl->out_buf != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00007226 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007227 mbedtls_zeroize( ssl->out_buf, MBEDTLS_SSL_BUFFER_LEN );
7228 mbedtls_free( ssl->out_buf );
Paul Bakker5121ce52009-01-03 21:22:43 +00007229 }
7230
Manuel Pégourié-Gonnard7ee6f0e2014-02-13 10:54:07 +01007231 if( ssl->in_buf != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00007232 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007233 mbedtls_zeroize( ssl->in_buf, MBEDTLS_SSL_BUFFER_LEN );
7234 mbedtls_free( ssl->in_buf );
Paul Bakker5121ce52009-01-03 21:22:43 +00007235 }
7236
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007237#if defined(MBEDTLS_ZLIB_SUPPORT)
Paul Bakker16770332013-10-11 09:59:44 +02007238 if( ssl->compress_buf != NULL )
7239 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007240 mbedtls_zeroize( ssl->compress_buf, MBEDTLS_SSL_BUFFER_LEN );
7241 mbedtls_free( ssl->compress_buf );
Paul Bakker16770332013-10-11 09:59:44 +02007242 }
7243#endif
7244
Paul Bakker48916f92012-09-16 19:57:18 +00007245 if( ssl->transform )
7246 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007247 mbedtls_ssl_transform_free( ssl->transform );
7248 mbedtls_free( ssl->transform );
Paul Bakker48916f92012-09-16 19:57:18 +00007249 }
7250
7251 if( ssl->handshake )
7252 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007253 mbedtls_ssl_handshake_free( ssl->handshake );
7254 mbedtls_ssl_transform_free( ssl->transform_negotiate );
7255 mbedtls_ssl_session_free( ssl->session_negotiate );
Paul Bakker48916f92012-09-16 19:57:18 +00007256
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007257 mbedtls_free( ssl->handshake );
7258 mbedtls_free( ssl->transform_negotiate );
7259 mbedtls_free( ssl->session_negotiate );
Paul Bakker48916f92012-09-16 19:57:18 +00007260 }
7261
Paul Bakkerc0463502013-02-14 11:19:38 +01007262 if( ssl->session )
7263 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007264 mbedtls_ssl_session_free( ssl->session );
7265 mbedtls_free( ssl->session );
Paul Bakkerc0463502013-02-14 11:19:38 +01007266 }
7267
Manuel Pégourié-Gonnard55fab2d2015-05-11 16:15:19 +02007268#if defined(MBEDTLS_X509_CRT_PARSE_C)
Paul Bakker66d5d072014-06-17 16:39:18 +02007269 if( ssl->hostname != NULL )
Paul Bakker5121ce52009-01-03 21:22:43 +00007270 {
Manuel Pégourié-Gonnardba26c242015-05-06 10:47:06 +01007271 mbedtls_zeroize( ssl->hostname, strlen( ssl->hostname ) );
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007272 mbedtls_free( ssl->hostname );
Paul Bakker5121ce52009-01-03 21:22:43 +00007273 }
Paul Bakker0be444a2013-08-27 21:55:01 +02007274#endif
Paul Bakker5121ce52009-01-03 21:22:43 +00007275
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007276#if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
7277 if( mbedtls_ssl_hw_record_finish != NULL )
Paul Bakker05ef8352012-05-08 09:17:57 +00007278 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007279 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) );
7280 mbedtls_ssl_hw_record_finish( ssl );
Paul Bakker05ef8352012-05-08 09:17:57 +00007281 }
7282#endif
7283
Manuel Pégourié-Gonnarde057d3b2015-05-20 10:59:43 +02007284#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007285 mbedtls_free( ssl->cli_id );
Manuel Pégourié-Gonnard43c02182014-07-22 17:32:01 +02007286#endif
7287
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007288 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) );
Paul Bakker2da561c2009-02-05 18:00:28 +00007289
Paul Bakker86f04f42013-02-14 11:20:09 +01007290 /* Actually clear after last debug message */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007291 mbedtls_zeroize( ssl, sizeof( mbedtls_ssl_context ) );
Paul Bakker5121ce52009-01-03 21:22:43 +00007292}
7293
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007294/*
7295 * Initialze mbedtls_ssl_config
7296 */
7297void mbedtls_ssl_config_init( mbedtls_ssl_config *conf )
7298{
7299 memset( conf, 0, sizeof( mbedtls_ssl_config ) );
7300}
7301
Simon Butcherc941b6c2015-12-28 01:29:10 +00007302#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnardb39528e2015-12-04 15:02:56 +01007303static int ssl_preset_default_hashes[] = {
7304#if defined(MBEDTLS_SHA512_C)
7305 MBEDTLS_MD_SHA512,
7306 MBEDTLS_MD_SHA384,
7307#endif
7308#if defined(MBEDTLS_SHA256_C)
7309 MBEDTLS_MD_SHA256,
7310 MBEDTLS_MD_SHA224,
7311#endif
Gilles Peskine7344e1b2017-05-12 13:16:40 +02007312#if defined(MBEDTLS_SHA1_C) && defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_KEY_EXCHANGE)
Manuel Pégourié-Gonnardb39528e2015-12-04 15:02:56 +01007313 MBEDTLS_MD_SHA1,
7314#endif
7315 MBEDTLS_MD_NONE
7316};
Simon Butcherc941b6c2015-12-28 01:29:10 +00007317#endif
Manuel Pégourié-Gonnardb39528e2015-12-04 15:02:56 +01007318
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007319static int ssl_preset_suiteb_ciphersuites[] = {
7320 MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
7321 MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
7322 0
7323};
7324
Manuel Pégourié-Gonnardf9945bc2015-10-22 17:01:15 +02007325#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007326static int ssl_preset_suiteb_hashes[] = {
7327 MBEDTLS_MD_SHA256,
7328 MBEDTLS_MD_SHA384,
7329 MBEDTLS_MD_NONE
7330};
7331#endif
7332
7333#if defined(MBEDTLS_ECP_C)
7334static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = {
7335 MBEDTLS_ECP_DP_SECP256R1,
7336 MBEDTLS_ECP_DP_SECP384R1,
7337 MBEDTLS_ECP_DP_NONE
7338};
7339#endif
7340
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007341/*
Tillmann Karras588ad502015-09-25 04:27:22 +02007342 * Load default in mbedtls_ssl_config
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007343 */
Manuel Pégourié-Gonnard419d5ae2015-05-04 19:32:36 +02007344int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007345 int endpoint, int transport, int preset )
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007346{
Manuel Pégourié-Gonnard8b431fb2015-05-11 12:54:52 +02007347#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007348 int ret;
Manuel Pégourié-Gonnard8b431fb2015-05-11 12:54:52 +02007349#endif
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007350
Manuel Pégourié-Gonnard0de074f2015-05-14 12:58:01 +02007351 /* Use the functions here so that they are covered in tests,
7352 * but otherwise access member directly for efficiency */
7353 mbedtls_ssl_conf_endpoint( conf, endpoint );
7354 mbedtls_ssl_conf_transport( conf, transport );
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007355
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007356 /*
7357 * Things that are common to all presets
7358 */
Manuel Pégourié-Gonnard419d5ae2015-05-04 19:32:36 +02007359#if defined(MBEDTLS_SSL_CLI_C)
7360 if( endpoint == MBEDTLS_SSL_IS_CLIENT )
7361 {
7362 conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
7363#if defined(MBEDTLS_SSL_SESSION_TICKETS)
7364 conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED;
7365#endif
7366 }
7367#endif
7368
Manuel Pégourié-Gonnard66dc5552015-05-14 12:28:21 +02007369#if defined(MBEDTLS_ARC4_C)
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007370 conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED;
Manuel Pégourié-Gonnard66dc5552015-05-14 12:28:21 +02007371#endif
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007372
7373#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
7374 conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
7375#endif
7376
7377#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
7378 conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
7379#endif
7380
Manuel Pégourié-Gonnard17eab2b2015-05-05 16:34:53 +01007381#if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
7382 conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED;
7383#endif
7384
Manuel Pégourié-Gonnarde057d3b2015-05-20 10:59:43 +02007385#if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007386 conf->f_cookie_write = ssl_cookie_write_dummy;
7387 conf->f_cookie_check = ssl_cookie_check_dummy;
7388#endif
7389
7390#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
7391 conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED;
7392#endif
7393
7394#if defined(MBEDTLS_SSL_PROTO_DTLS)
7395 conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN;
7396 conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX;
7397#endif
7398
7399#if defined(MBEDTLS_SSL_RENEGOTIATION)
7400 conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT;
Andres AG7fa66d42016-12-15 17:01:16 +00007401 memset( conf->renego_period, 0x00, 2 );
7402 memset( conf->renego_period + 2, 0xFF, 6 );
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007403#endif
7404
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007405#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
7406 if( endpoint == MBEDTLS_SSL_IS_SERVER )
7407 {
7408 if( ( ret = mbedtls_ssl_conf_dh_param( conf,
Hanno Becker80e0d462017-10-13 16:51:54 +01007409 MBEDTLS_DHM_RFC3526_MODP_2048_P,
7410 MBEDTLS_DHM_RFC3526_MODP_2048_G ) ) != 0 )
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007411 {
7412 return( ret );
7413 }
7414 }
Manuel Pégourié-Gonnardbd990d62015-06-11 14:49:42 +02007415#endif
7416
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007417 /*
7418 * Preset-specific defaults
7419 */
7420 switch( preset )
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007421 {
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007422 /*
7423 * NSA Suite B
7424 */
7425 case MBEDTLS_SSL_PRESET_SUITEB:
7426 conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
7427 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */
7428 conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
7429 conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
7430
7431 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
7432 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
7433 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
7434 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
7435 ssl_preset_suiteb_ciphersuites;
7436
7437#if defined(MBEDTLS_X509_CRT_PARSE_C)
7438 conf->cert_profile = &mbedtls_x509_crt_profile_suiteb;
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007439#endif
7440
Manuel Pégourié-Gonnardf9945bc2015-10-22 17:01:15 +02007441#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007442 conf->sig_hashes = ssl_preset_suiteb_hashes;
7443#endif
7444
7445#if defined(MBEDTLS_ECP_C)
7446 conf->curve_list = ssl_preset_suiteb_curves;
7447#endif
Manuel Pégourié-Gonnardc98204e2015-08-11 04:21:01 +02007448 break;
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007449
7450 /*
7451 * Default
7452 */
7453 default:
Ron Eldor1ac9aa72017-05-28 10:46:38 +03007454 conf->min_major_ver = ( MBEDTLS_SSL_MIN_MAJOR_VERSION >
7455 MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION ) ?
7456 MBEDTLS_SSL_MIN_MAJOR_VERSION :
7457 MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION;
7458 conf->min_minor_ver = ( MBEDTLS_SSL_MIN_MINOR_VERSION >
7459 MBEDTLS_SSL_MIN_VALID_MINOR_VERSION ) ?
7460 MBEDTLS_SSL_MIN_MINOR_VERSION :
7461 MBEDTLS_SSL_MIN_VALID_MINOR_VERSION;
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007462 conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
7463 conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
7464
7465#if defined(MBEDTLS_SSL_PROTO_DTLS)
7466 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
7467 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2;
7468#endif
7469
7470 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
7471 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
7472 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
7473 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
7474 mbedtls_ssl_list_ciphersuites();
7475
7476#if defined(MBEDTLS_X509_CRT_PARSE_C)
7477 conf->cert_profile = &mbedtls_x509_crt_profile_default;
7478#endif
7479
Manuel Pégourié-Gonnardf9945bc2015-10-22 17:01:15 +02007480#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnardb39528e2015-12-04 15:02:56 +01007481 conf->sig_hashes = ssl_preset_default_hashes;
Manuel Pégourié-Gonnardb31c5f62015-06-17 13:53:47 +02007482#endif
7483
7484#if defined(MBEDTLS_ECP_C)
7485 conf->curve_list = mbedtls_ecp_grp_id_list();
7486#endif
7487
7488#if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
7489 conf->dhm_min_bitlen = 1024;
7490#endif
7491 }
7492
Manuel Pégourié-Gonnardcd523e22015-05-04 13:35:39 +02007493 return( 0 );
7494}
7495
7496/*
7497 * Free mbedtls_ssl_config
7498 */
7499void mbedtls_ssl_config_free( mbedtls_ssl_config *conf )
7500{
7501#if defined(MBEDTLS_DHM_C)
7502 mbedtls_mpi_free( &conf->dhm_P );
7503 mbedtls_mpi_free( &conf->dhm_G );
7504#endif
7505
7506#if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
7507 if( conf->psk != NULL )
7508 {
7509 mbedtls_zeroize( conf->psk, conf->psk_len );
7510 mbedtls_zeroize( conf->psk_identity, conf->psk_identity_len );
7511 mbedtls_free( conf->psk );
7512 mbedtls_free( conf->psk_identity );
7513 conf->psk_len = 0;
7514 conf->psk_identity_len = 0;
7515 }
7516#endif
7517
7518#if defined(MBEDTLS_X509_CRT_PARSE_C)
7519 ssl_key_cert_free( conf->key_cert );
7520#endif
7521
7522 mbedtls_zeroize( conf, sizeof( mbedtls_ssl_config ) );
7523}
7524
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007525#if defined(MBEDTLS_PK_C)
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007526/*
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007527 * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007528 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007529unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk )
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007530{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007531#if defined(MBEDTLS_RSA_C)
7532 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) )
7533 return( MBEDTLS_SSL_SIG_RSA );
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007534#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007535#if defined(MBEDTLS_ECDSA_C)
7536 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) )
7537 return( MBEDTLS_SSL_SIG_ECDSA );
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007538#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007539 return( MBEDTLS_SSL_SIG_ANON );
Manuel Pégourié-Gonnard0d420492013-08-21 16:14:26 +02007540}
7541
Hanno Beckeraa8a2bd2017-04-28 17:15:26 +01007542unsigned char mbedtls_ssl_sig_from_pk_alg( mbedtls_pk_type_t type )
7543{
7544 switch( type ) {
7545 case MBEDTLS_PK_RSA:
7546 return( MBEDTLS_SSL_SIG_RSA );
7547 case MBEDTLS_PK_ECDSA:
7548 case MBEDTLS_PK_ECKEY:
7549 return( MBEDTLS_SSL_SIG_ECDSA );
7550 default:
7551 return( MBEDTLS_SSL_SIG_ANON );
7552 }
7553}
7554
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007555mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig )
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007556{
7557 switch( sig )
7558 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007559#if defined(MBEDTLS_RSA_C)
7560 case MBEDTLS_SSL_SIG_RSA:
7561 return( MBEDTLS_PK_RSA );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007562#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007563#if defined(MBEDTLS_ECDSA_C)
7564 case MBEDTLS_SSL_SIG_ECDSA:
7565 return( MBEDTLS_PK_ECDSA );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007566#endif
7567 default:
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007568 return( MBEDTLS_PK_NONE );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007569 }
7570}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007571#endif /* MBEDTLS_PK_C */
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007572
Hanno Beckeraa8a2bd2017-04-28 17:15:26 +01007573#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
7574 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7575
7576/* Find an entry in a signature-hash set matching a given hash algorithm. */
7577mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set,
7578 mbedtls_pk_type_t sig_alg )
7579{
7580 switch( sig_alg )
7581 {
7582 case MBEDTLS_PK_RSA:
7583 return( set->rsa );
7584 case MBEDTLS_PK_ECDSA:
7585 return( set->ecdsa );
7586 default:
7587 return( MBEDTLS_MD_NONE );
7588 }
7589}
7590
7591/* Add a signature-hash-pair to a signature-hash set */
7592void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set,
7593 mbedtls_pk_type_t sig_alg,
7594 mbedtls_md_type_t md_alg )
7595{
7596 switch( sig_alg )
7597 {
7598 case MBEDTLS_PK_RSA:
7599 if( set->rsa == MBEDTLS_MD_NONE )
7600 set->rsa = md_alg;
7601 break;
7602
7603 case MBEDTLS_PK_ECDSA:
7604 if( set->ecdsa == MBEDTLS_MD_NONE )
7605 set->ecdsa = md_alg;
7606 break;
7607
7608 default:
7609 break;
7610 }
7611}
7612
7613/* Allow exactly one hash algorithm for each signature. */
7614void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set,
7615 mbedtls_md_type_t md_alg )
7616{
7617 set->rsa = md_alg;
7618 set->ecdsa = md_alg;
7619}
7620
7621#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
7622 MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
7623
Manuel Pégourié-Gonnard1a483832013-09-20 12:29:15 +02007624/*
Manuel Pégourié-Gonnard7bfc1222015-06-17 14:34:48 +02007625 * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX
Manuel Pégourié-Gonnard1a483832013-09-20 12:29:15 +02007626 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007627mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash )
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007628{
7629 switch( hash )
7630 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007631#if defined(MBEDTLS_MD5_C)
7632 case MBEDTLS_SSL_HASH_MD5:
7633 return( MBEDTLS_MD_MD5 );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007634#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007635#if defined(MBEDTLS_SHA1_C)
7636 case MBEDTLS_SSL_HASH_SHA1:
7637 return( MBEDTLS_MD_SHA1 );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007638#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007639#if defined(MBEDTLS_SHA256_C)
7640 case MBEDTLS_SSL_HASH_SHA224:
7641 return( MBEDTLS_MD_SHA224 );
7642 case MBEDTLS_SSL_HASH_SHA256:
7643 return( MBEDTLS_MD_SHA256 );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007644#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007645#if defined(MBEDTLS_SHA512_C)
7646 case MBEDTLS_SSL_HASH_SHA384:
7647 return( MBEDTLS_MD_SHA384 );
7648 case MBEDTLS_SSL_HASH_SHA512:
7649 return( MBEDTLS_MD_SHA512 );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007650#endif
7651 default:
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007652 return( MBEDTLS_MD_NONE );
Manuel Pégourié-Gonnarda20c58c2013-08-22 13:52:48 +02007653 }
7654}
7655
Manuel Pégourié-Gonnard7bfc1222015-06-17 14:34:48 +02007656/*
7657 * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX
7658 */
7659unsigned char mbedtls_ssl_hash_from_md_alg( int md )
7660{
7661 switch( md )
7662 {
7663#if defined(MBEDTLS_MD5_C)
7664 case MBEDTLS_MD_MD5:
7665 return( MBEDTLS_SSL_HASH_MD5 );
7666#endif
7667#if defined(MBEDTLS_SHA1_C)
7668 case MBEDTLS_MD_SHA1:
7669 return( MBEDTLS_SSL_HASH_SHA1 );
7670#endif
7671#if defined(MBEDTLS_SHA256_C)
7672 case MBEDTLS_MD_SHA224:
7673 return( MBEDTLS_SSL_HASH_SHA224 );
7674 case MBEDTLS_MD_SHA256:
7675 return( MBEDTLS_SSL_HASH_SHA256 );
7676#endif
7677#if defined(MBEDTLS_SHA512_C)
7678 case MBEDTLS_MD_SHA384:
7679 return( MBEDTLS_SSL_HASH_SHA384 );
7680 case MBEDTLS_MD_SHA512:
7681 return( MBEDTLS_SSL_HASH_SHA512 );
7682#endif
7683 default:
7684 return( MBEDTLS_SSL_HASH_NONE );
7685 }
7686}
7687
Manuel Pégourié-Gonnardb541da62015-06-17 11:43:30 +02007688#if defined(MBEDTLS_ECP_C)
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007689/*
Manuel Pégourié-Gonnard7bfc1222015-06-17 14:34:48 +02007690 * Check if a curve proposed by the peer is in our list.
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02007691 * Return 0 if we're willing to use it, -1 otherwise.
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007692 */
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02007693int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id )
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007694{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007695 const mbedtls_ecp_group_id *gid;
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007696
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02007697 if( ssl->conf->curve_list == NULL )
7698 return( -1 );
7699
Manuel Pégourié-Gonnard7ca4e4d2015-05-04 10:55:58 +02007700 for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007701 if( *gid == grp_id )
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02007702 return( 0 );
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007703
Manuel Pégourié-Gonnard9d412d82015-06-17 12:10:46 +02007704 return( -1 );
Manuel Pégourié-Gonnardab240102014-02-04 16:18:07 +01007705}
Manuel Pégourié-Gonnardb541da62015-06-17 11:43:30 +02007706#endif /* MBEDTLS_ECP_C */
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007707
Manuel Pégourié-Gonnardf9945bc2015-10-22 17:01:15 +02007708#if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
Manuel Pégourié-Gonnard7bfc1222015-06-17 14:34:48 +02007709/*
7710 * Check if a hash proposed by the peer is in our list.
7711 * Return 0 if we're willing to use it, -1 otherwise.
7712 */
7713int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl,
7714 mbedtls_md_type_t md )
7715{
7716 const int *cur;
7717
7718 if( ssl->conf->sig_hashes == NULL )
7719 return( -1 );
7720
7721 for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
7722 if( *cur == (int) md )
7723 return( 0 );
7724
7725 return( -1 );
7726}
Manuel Pégourié-Gonnardf9945bc2015-10-22 17:01:15 +02007727#endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
Manuel Pégourié-Gonnard7bfc1222015-06-17 14:34:48 +02007728
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007729#if defined(MBEDTLS_X509_CRT_PARSE_C)
7730int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert,
7731 const mbedtls_ssl_ciphersuite_t *ciphersuite,
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007732 int cert_endpoint,
Manuel Pégourié-Gonnarde6ef16f2015-05-11 19:54:43 +02007733 uint32_t *flags )
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007734{
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007735 int ret = 0;
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007736#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007737 int usage = 0;
7738#endif
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007739#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007740 const char *ext_oid;
7741 size_t ext_len;
7742#endif
7743
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007744#if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \
7745 !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007746 ((void) cert);
7747 ((void) cert_endpoint);
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007748 ((void) flags);
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007749#endif
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007750
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007751#if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
7752 if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007753 {
7754 /* Server part of the key exchange */
7755 switch( ciphersuite->key_exchange )
7756 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007757 case MBEDTLS_KEY_EXCHANGE_RSA:
7758 case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01007759 usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007760 break;
7761
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007762 case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
7763 case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
7764 case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
7765 usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007766 break;
7767
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007768 case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
7769 case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01007770 usage = MBEDTLS_X509_KU_KEY_AGREEMENT;
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007771 break;
7772
7773 /* Don't use default: we want warnings when adding new values */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007774 case MBEDTLS_KEY_EXCHANGE_NONE:
7775 case MBEDTLS_KEY_EXCHANGE_PSK:
7776 case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
7777 case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007778 usage = 0;
7779 }
7780 }
7781 else
7782 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007783 /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */
7784 usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007785 }
7786
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007787 if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 )
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007788 {
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01007789 *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE;
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007790 ret = -1;
7791 }
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007792#else
7793 ((void) ciphersuite);
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007794#endif /* MBEDTLS_X509_CHECK_KEY_USAGE */
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007795
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007796#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
7797 if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007798 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007799 ext_oid = MBEDTLS_OID_SERVER_AUTH;
7800 ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH );
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007801 }
7802 else
7803 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007804 ext_oid = MBEDTLS_OID_CLIENT_AUTH;
7805 ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH );
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007806 }
7807
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007808 if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 )
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007809 {
Manuel Pégourié-Gonnarde6028c92015-04-20 12:19:02 +01007810 *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE;
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007811 ret = -1;
7812 }
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007813#endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
Manuel Pégourié-Gonnard0408fd12014-04-11 11:06:22 +02007814
Manuel Pégourié-Gonnarde6efa6f2015-04-20 11:01:48 +01007815 return( ret );
Manuel Pégourié-Gonnard7f2a07d2014-04-09 09:50:57 +02007816}
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007817#endif /* MBEDTLS_X509_CRT_PARSE_C */
Manuel Pégourié-Gonnard3a306b92014-04-29 15:11:17 +02007818
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007819/*
7820 * Convert version numbers to/from wire format
7821 * and, for DTLS, to/from TLS equivalent.
7822 *
7823 * For TLS this is the identity.
Brian J Murraye7f8dc32016-11-06 04:45:15 -08007824 * For DTLS, use 1's complement (v -> 255 - v, and then map as follows:
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007825 * 1.0 <-> 3.2 (DTLS 1.0 is based on TLS 1.1)
7826 * 1.x <-> 3.x+1 for x != 0 (DTLS 1.2 based on TLS 1.2)
7827 */
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007828void mbedtls_ssl_write_version( int major, int minor, int transport,
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007829 unsigned char ver[2] )
7830{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007831#if defined(MBEDTLS_SSL_PROTO_DTLS)
7832 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007833 {
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007834 if( minor == MBEDTLS_SSL_MINOR_VERSION_2 )
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007835 --minor; /* DTLS 1.0 stored as TLS 1.1 internally */
7836
7837 ver[0] = (unsigned char)( 255 - ( major - 2 ) );
7838 ver[1] = (unsigned char)( 255 - ( minor - 1 ) );
7839 }
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +01007840 else
7841#else
7842 ((void) transport);
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007843#endif
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +01007844 {
7845 ver[0] = (unsigned char) major;
7846 ver[1] = (unsigned char) minor;
7847 }
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007848}
7849
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007850void mbedtls_ssl_read_version( int *major, int *minor, int transport,
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007851 const unsigned char ver[2] )
7852{
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007853#if defined(MBEDTLS_SSL_PROTO_DTLS)
7854 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007855 {
7856 *major = 255 - ver[0] + 2;
7857 *minor = 255 - ver[1] + 1;
7858
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007859 if( *minor == MBEDTLS_SSL_MINOR_VERSION_1 )
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007860 ++*minor; /* DTLS 1.0 stored as TLS 1.1 internally */
7861 }
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +01007862 else
7863#else
7864 ((void) transport);
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007865#endif
Manuel Pégourié-Gonnard34c10112014-03-25 13:36:22 +01007866 {
7867 *major = ver[0];
7868 *minor = ver[1];
7869 }
Manuel Pégourié-Gonnardabc7e3b2014-02-11 18:15:03 +01007870}
7871
Manuel Pégourié-Gonnard2cf5a7c2015-04-08 12:49:31 +02007872#endif /* MBEDTLS_SSL_TLS_C */