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Manuel Pégourié-Gonnardfd6d8972015-05-15 12:09:00 +02001/*
2 * TLS server tickets callbacks implementation
3 *
Manuel Pégourié-Gonnard6fb81872015-07-27 11:11:48 +02004 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
Bence Szépkúti4e9f7122020-06-05 13:02:18 +02005 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6 *
7 * This file is provided under the Apache License 2.0, or the
8 * GNU General Public License v2.0 or later.
9 *
10 * **********
11 * Apache License 2.0:
Manuel Pégourié-Gonnard37ff1402015-09-04 14:21:07 +020012 *
13 * Licensed under the Apache License, Version 2.0 (the "License"); you may
14 * not use this file except in compliance with the License.
15 * You may obtain a copy of the License at
16 *
17 * http://www.apache.org/licenses/LICENSE-2.0
18 *
19 * Unless required by applicable law or agreed to in writing, software
20 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
21 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
22 * See the License for the specific language governing permissions and
23 * limitations under the License.
Manuel Pégourié-Gonnardfd6d8972015-05-15 12:09:00 +020024 *
Bence Szépkúti4e9f7122020-06-05 13:02:18 +020025 * **********
26 *
27 * **********
28 * GNU General Public License v2.0 or later:
29 *
30 * This program is free software; you can redistribute it and/or modify
31 * it under the terms of the GNU General Public License as published by
32 * the Free Software Foundation; either version 2 of the License, or
33 * (at your option) any later version.
34 *
35 * This program is distributed in the hope that it will be useful,
36 * but WITHOUT ANY WARRANTY; without even the implied warranty of
37 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
38 * GNU General Public License for more details.
39 *
40 * You should have received a copy of the GNU General Public License along
41 * with this program; if not, write to the Free Software Foundation, Inc.,
42 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
43 *
44 * **********
45 *
Manuel Pégourié-Gonnardfd6d8972015-05-15 12:09:00 +020046 * This file is part of mbed TLS (https://tls.mbed.org)
Manuel Pégourié-Gonnardfd6d8972015-05-15 12:09:00 +020047 */
48
49#if !defined(MBEDTLS_CONFIG_FILE)
50#include "mbedtls/config.h"
51#else
52#include MBEDTLS_CONFIG_FILE
53#endif
54
55#if defined(MBEDTLS_SSL_TICKET_C)
56
Manuel Pégourié-Gonnardfd6d8972015-05-15 12:09:00 +020057#if defined(MBEDTLS_PLATFORM_C)
58#include "mbedtls/platform.h"
59#else
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +020060#include <stdlib.h>
61#define mbedtls_calloc calloc
SimonBd5800b72016-04-26 07:43:27 +010062#define mbedtls_free free
Manuel Pégourié-Gonnardfd6d8972015-05-15 12:09:00 +020063#endif
64
Hanno Becker0e8dc482017-04-12 14:54:42 +010065#include "mbedtls/ssl_internal.h"
SimonBd5800b72016-04-26 07:43:27 +010066#include "mbedtls/ssl_ticket.h"
67
Manuel Pégourié-Gonnardfd6d8972015-05-15 12:09:00 +020068#include <string.h>
69
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +020070/* Implementation that should never be optimized out by the compiler */
71static void mbedtls_zeroize( void *v, size_t n ) {
72 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
73}
74
75/*
76 * Initialze context
77 */
78void mbedtls_ssl_ticket_init( mbedtls_ssl_ticket_context *ctx )
79{
80 memset( ctx, 0, sizeof( mbedtls_ssl_ticket_context ) );
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +020081
82#if defined(MBEDTLS_THREADING_C)
83 mbedtls_mutex_init( &ctx->mutex );
84#endif
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +020085}
86
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +020087#define MAX_KEY_BYTES 32 /* 256 bits */
88
Hanno Becker910a7512018-11-17 21:18:01 +000089#define TICKET_KEY_NAME_BYTES 4
90#define TICKET_IV_BYTES 12
91#define TICKET_CRYPT_LEN_BYTES 2
92#define TICKET_AUTH_TAG_BYTES 16
93
94#define TICKET_MIN_LEN ( TICKET_KEY_NAME_BYTES + \
95 TICKET_IV_BYTES + \
96 TICKET_CRYPT_LEN_BYTES + \
97 TICKET_AUTH_TAG_BYTES )
98#define TICKET_ADD_DATA_LEN ( TICKET_KEY_NAME_BYTES + \
99 TICKET_IV_BYTES + \
100 TICKET_CRYPT_LEN_BYTES )
101
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200102/*
103 * Generate/update a key
104 */
105static int ssl_ticket_gen_key( mbedtls_ssl_ticket_context *ctx,
106 unsigned char index )
107{
108 int ret;
109 unsigned char buf[MAX_KEY_BYTES];
110 mbedtls_ssl_ticket_key *key = ctx->keys + index;
111
112#if defined(MBEDTLS_HAVE_TIME)
SimonBd5800b72016-04-26 07:43:27 +0100113 key->generation_time = (uint32_t) mbedtls_time( NULL );
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200114#endif
115
116 if( ( ret = ctx->f_rng( ctx->p_rng, key->name, sizeof( key->name ) ) ) != 0 )
117 return( ret );
118
119 if( ( ret = ctx->f_rng( ctx->p_rng, buf, sizeof( buf ) ) ) != 0 )
120 return( ret );
121
122 /* With GCM and CCM, same context can encrypt & decrypt */
123 ret = mbedtls_cipher_setkey( &key->ctx, buf,
Manuel Pégourié-Gonnard097c7bb2015-06-18 16:43:38 +0200124 mbedtls_cipher_get_key_bitlen( &key->ctx ),
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200125 MBEDTLS_ENCRYPT );
126
127 mbedtls_zeroize( buf, sizeof( buf ) );
128
129 return( ret );
130}
131
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200132/*
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200133 * Rotate/generate keys if necessary
134 */
135static int ssl_ticket_update_keys( mbedtls_ssl_ticket_context *ctx )
136{
137#if !defined(MBEDTLS_HAVE_TIME)
138 ((void) ctx);
139#else
140 if( ctx->ticket_lifetime != 0 )
141 {
SimonBd5800b72016-04-26 07:43:27 +0100142 uint32_t current_time = (uint32_t) mbedtls_time( NULL );
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200143 uint32_t key_time = ctx->keys[ctx->active].generation_time;
144
Hanno Becker6c794fa2018-08-21 13:55:31 +0100145 if( current_time >= key_time &&
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200146 current_time - key_time < ctx->ticket_lifetime )
147 {
148 return( 0 );
149 }
150
151 ctx->active = 1 - ctx->active;
152
153 return( ssl_ticket_gen_key( ctx, ctx->active ) );
154 }
155 else
156#endif /* MBEDTLS_HAVE_TIME */
157 return( 0 );
158}
159
160/*
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200161 * Setup context for actual use
162 */
163int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
164 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
Manuel Pégourié-Gonnarda0adc1b2015-05-25 10:35:16 +0200165 mbedtls_cipher_type_t cipher,
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200166 uint32_t lifetime )
167{
168 int ret;
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200169 const mbedtls_cipher_info_t *cipher_info;
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200170
171 ctx->f_rng = f_rng;
172 ctx->p_rng = p_rng;
173
174 ctx->ticket_lifetime = lifetime;
175
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200176 cipher_info = mbedtls_cipher_info_from_type( cipher);
177 if( cipher_info == NULL )
178 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
179
180 if( cipher_info->mode != MBEDTLS_MODE_GCM &&
181 cipher_info->mode != MBEDTLS_MODE_CCM )
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200182 {
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200183 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200184 }
185
Manuel Pégourié-Gonnard898e0aa2015-06-18 15:28:12 +0200186 if( cipher_info->key_bitlen > 8 * MAX_KEY_BYTES )
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200187 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
188
189 if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 ||
190 ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
Manuel Pégourié-Gonnarda0adc1b2015-05-25 10:35:16 +0200191 {
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200192 return( ret );
Manuel Pégourié-Gonnarda0adc1b2015-05-25 10:35:16 +0200193 }
194
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200195 if( ( ret = ssl_ticket_gen_key( ctx, 0 ) ) != 0 ||
196 ( ret = ssl_ticket_gen_key( ctx, 1 ) ) != 0 )
Manuel Pégourié-Gonnarda0adc1b2015-05-25 10:35:16 +0200197 {
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200198 return( ret );
Manuel Pégourié-Gonnarda0adc1b2015-05-25 10:35:16 +0200199 }
200
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200201 return( 0 );
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200202}
203
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200204/*
205 * Serialize a session in the following format:
206 * 0 . n-1 session structure, n = sizeof(mbedtls_ssl_session)
207 * n . n+2 peer_cert length = m (0 if no certificate)
208 * n+3 . n+2+m peer cert ASN.1
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200209 */
210static int ssl_save_session( const mbedtls_ssl_session *session,
211 unsigned char *buf, size_t buf_len,
212 size_t *olen )
213{
214 unsigned char *p = buf;
215 size_t left = buf_len;
216#if defined(MBEDTLS_X509_CRT_PARSE_C)
217 size_t cert_len;
218#endif /* MBEDTLS_X509_CRT_PARSE_C */
219
220 if( left < sizeof( mbedtls_ssl_session ) )
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200221 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200222
223 memcpy( p, session, sizeof( mbedtls_ssl_session ) );
224 p += sizeof( mbedtls_ssl_session );
225 left -= sizeof( mbedtls_ssl_session );
226
227#if defined(MBEDTLS_X509_CRT_PARSE_C)
228 if( session->peer_cert == NULL )
229 cert_len = 0;
230 else
231 cert_len = session->peer_cert->raw.len;
232
233 if( left < 3 + cert_len )
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200234 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200235
Hanno Beckere67f7a72018-10-24 13:31:49 +0100236 *p++ = (unsigned char)( ( cert_len >> 16 ) & 0xFF );
237 *p++ = (unsigned char)( ( cert_len >> 8 ) & 0xFF );
238 *p++ = (unsigned char)( ( cert_len ) & 0xFF );
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200239
240 if( session->peer_cert != NULL )
241 memcpy( p, session->peer_cert->raw.p, cert_len );
242
243 p += cert_len;
244#endif /* MBEDTLS_X509_CRT_PARSE_C */
245
246 *olen = p - buf;
247
248 return( 0 );
249}
250
251/*
252 * Unserialise session, see ssl_save_session()
253 */
254static int ssl_load_session( mbedtls_ssl_session *session,
255 const unsigned char *buf, size_t len )
256{
257 const unsigned char *p = buf;
258 const unsigned char * const end = buf + len;
259#if defined(MBEDTLS_X509_CRT_PARSE_C)
260 size_t cert_len;
261#endif /* MBEDTLS_X509_CRT_PARSE_C */
262
Hanno Beckerfa95a6a2018-10-24 13:33:02 +0100263 if( sizeof( mbedtls_ssl_session ) > (size_t)( end - p ) )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200264 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
265
266 memcpy( session, p, sizeof( mbedtls_ssl_session ) );
267 p += sizeof( mbedtls_ssl_session );
268
269#if defined(MBEDTLS_X509_CRT_PARSE_C)
Hanno Beckerfa95a6a2018-10-24 13:33:02 +0100270 if( 3 > (size_t)( end - p ) )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200271 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
272
273 cert_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2];
274 p += 3;
275
276 if( cert_len == 0 )
277 {
278 session->peer_cert = NULL;
279 }
280 else
281 {
282 int ret;
283
Hanno Beckerfa95a6a2018-10-24 13:33:02 +0100284 if( cert_len > (size_t)( end - p ) )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200285 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
286
Manuel Pégourié-Gonnard7551cb92015-05-26 16:04:06 +0200287 session->peer_cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200288
289 if( session->peer_cert == NULL )
Manuel Pégourié-Gonnard6a8ca332015-05-28 09:33:39 +0200290 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200291
292 mbedtls_x509_crt_init( session->peer_cert );
293
294 if( ( ret = mbedtls_x509_crt_parse_der( session->peer_cert,
Hanno Becker52adf342018-10-24 13:41:37 +0100295 p, cert_len ) ) != 0 )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200296 {
297 mbedtls_x509_crt_free( session->peer_cert );
298 mbedtls_free( session->peer_cert );
299 session->peer_cert = NULL;
300 return( ret );
301 }
302
303 p += cert_len;
304 }
305#endif /* MBEDTLS_X509_CRT_PARSE_C */
306
307 if( p != end )
308 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
309
310 return( 0 );
311}
312
313/*
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200314 * Create session ticket, with the following structure:
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200315 *
316 * struct {
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200317 * opaque key_name[4];
318 * opaque iv[12];
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200319 * opaque encrypted_state<0..2^16-1>;
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200320 * opaque tag[16];
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200321 * } ticket;
322 *
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200323 * The key_name, iv, and length of encrypted_state are the additional
324 * authenticated data.
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200325 */
Hanno Becker910a7512018-11-17 21:18:01 +0000326
Manuel Pégourié-Gonnardb0394be2015-05-19 11:40:30 +0200327int mbedtls_ssl_ticket_write( void *p_ticket,
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +0200328 const mbedtls_ssl_session *session,
329 unsigned char *start,
330 const unsigned char *end,
Manuel Pégourié-Gonnardb0394be2015-05-19 11:40:30 +0200331 size_t *tlen,
332 uint32_t *ticket_lifetime )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200333{
334 int ret;
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200335 mbedtls_ssl_ticket_context *ctx = p_ticket;
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200336 mbedtls_ssl_ticket_key *key;
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200337 unsigned char *key_name = start;
Hanno Becker910a7512018-11-17 21:18:01 +0000338 unsigned char *iv = start + TICKET_KEY_NAME_BYTES;
339 unsigned char *state_len_bytes = iv + TICKET_IV_BYTES;
340 unsigned char *state = state_len_bytes + TICKET_CRYPT_LEN_BYTES;
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200341 unsigned char *tag;
342 size_t clear_len, ciph_len;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200343
344 *tlen = 0;
345
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200346 if( ctx == NULL || ctx->f_rng == NULL )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200347 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
348
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200349 /* We need at least 4 bytes for key_name, 12 for IV, 2 for len 16 for tag,
350 * in addition to session itself, that will be checked when writing it. */
Hanno Becker0e8dc482017-04-12 14:54:42 +0100351 MBEDTLS_SSL_CHK_BUF_PTR( start, end, TICKET_MIN_LEN );
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +0200352
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200353#if defined(MBEDTLS_THREADING_C)
354 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
355 return( ret );
356#endif
357
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200358 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
359 goto cleanup;
360
361 key = &ctx->keys[ctx->active];
362
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200363 *ticket_lifetime = ctx->ticket_lifetime;
364
Hanno Becker910a7512018-11-17 21:18:01 +0000365 memcpy( key_name, key->name, TICKET_KEY_NAME_BYTES );
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200366
Hanno Becker910a7512018-11-17 21:18:01 +0000367 if( ( ret = ctx->f_rng( ctx->p_rng, iv, TICKET_IV_BYTES ) ) != 0 )
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200368 goto cleanup;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200369
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +0200370 /* Dump session state */
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200371 if( ( ret = ssl_save_session( session,
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200372 state, end - state, &clear_len ) ) != 0 ||
373 (unsigned long) clear_len > 65535 )
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200374 {
375 goto cleanup;
376 }
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200377 state_len_bytes[0] = ( clear_len >> 8 ) & 0xff;
378 state_len_bytes[1] = ( clear_len ) & 0xff;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200379
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200380 /* Encrypt and authenticate */
381 tag = state + clear_len;
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200382 if( ( ret = mbedtls_cipher_auth_encrypt( &key->ctx,
Hanno Becker910a7512018-11-17 21:18:01 +0000383 iv, TICKET_IV_BYTES,
384 /* Additional data: key name, IV and length */
385 key_name, TICKET_ADD_DATA_LEN,
386 state, clear_len, state, &ciph_len,
387 tag, TICKET_AUTH_TAG_BYTES ) ) != 0 )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200388 {
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200389 goto cleanup;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200390 }
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200391 if( ciph_len != clear_len )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200392 {
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200393 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200394 goto cleanup;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200395 }
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200396
Hanno Becker910a7512018-11-17 21:18:01 +0000397 *tlen = TICKET_MIN_LEN + ciph_len;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200398
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200399cleanup:
400#if defined(MBEDTLS_THREADING_C)
401 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
402 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
403#endif
404
405 return( ret );
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200406}
407
408/*
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200409 * Select key based on name
410 */
411static mbedtls_ssl_ticket_key *ssl_ticket_select_key(
412 mbedtls_ssl_ticket_context *ctx,
413 const unsigned char name[4] )
414{
415 unsigned char i;
416
417 for( i = 0; i < sizeof( ctx->keys ) / sizeof( *ctx->keys ); i++ )
418 if( memcmp( name, ctx->keys[i].name, 4 ) == 0 )
419 return( &ctx->keys[i] );
420
421 return( NULL );
422}
423
424/*
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200425 * Load session ticket (see mbedtls_ssl_ticket_write for structure)
426 */
Manuel Pégourié-Gonnardb0394be2015-05-19 11:40:30 +0200427int mbedtls_ssl_ticket_parse( void *p_ticket,
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +0200428 mbedtls_ssl_session *session,
429 unsigned char *buf,
430 size_t len )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200431{
432 int ret;
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200433 mbedtls_ssl_ticket_context *ctx = p_ticket;
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200434 mbedtls_ssl_ticket_key *key;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200435 unsigned char *key_name = buf;
Hanno Becker910a7512018-11-17 21:18:01 +0000436 unsigned char *iv = buf + TICKET_KEY_NAME_BYTES;
437 unsigned char *enc_len_p = iv + TICKET_IV_BYTES;
438 unsigned char *ticket = enc_len_p + TICKET_CRYPT_LEN_BYTES;
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200439 unsigned char *tag;
440 size_t enc_len, clear_len;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200441
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200442 if( ctx == NULL || ctx->f_rng == NULL )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200443 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200444
Hanno Becker910a7512018-11-17 21:18:01 +0000445 if( len < TICKET_MIN_LEN )
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200446 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200447
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200448#if defined(MBEDTLS_THREADING_C)
449 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
450 return( ret );
451#endif
452
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200453 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
454 goto cleanup;
455
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200456 enc_len = ( enc_len_p[0] << 8 ) | enc_len_p[1];
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200457 tag = ticket + enc_len;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200458
Hanno Becker910a7512018-11-17 21:18:01 +0000459 if( len != TICKET_MIN_LEN + enc_len )
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200460 {
461 ret = MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
462 goto cleanup;
463 }
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200464
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200465 /* Select key */
466 if( ( key = ssl_ticket_select_key( ctx, key_name ) ) == NULL )
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200467 {
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200468 /* We can't know for sure but this is a likely option unless we're
469 * under attack - this is only informative anyway */
470 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200471 goto cleanup;
472 }
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200473
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200474 /* Decrypt and authenticate */
Hanno Becker910a7512018-11-17 21:18:01 +0000475 if( ( ret = mbedtls_cipher_auth_decrypt( &key->ctx,
476 iv, TICKET_IV_BYTES,
477 /* Additional data: key name, IV and length */
478 key_name, TICKET_ADD_DATA_LEN,
479 ticket, enc_len,
480 ticket, &clear_len,
481 tag, TICKET_AUTH_TAG_BYTES ) ) != 0 )
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200482 {
Manuel Pégourié-Gonnard1e9c4db2015-05-25 14:07:08 +0200483 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
484 ret = MBEDTLS_ERR_SSL_INVALID_MAC;
485
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200486 goto cleanup;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200487 }
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200488 if( clear_len != enc_len )
489 {
490 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200491 goto cleanup;
Manuel Pégourié-Gonnard1041a392015-05-20 19:59:39 +0200492 }
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200493
494 /* Actually load session */
Manuel Pégourié-Gonnard69f17282015-05-18 14:35:08 +0200495 if( ( ret = ssl_load_session( session, ticket, clear_len ) ) != 0 )
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200496 goto cleanup;
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200497
498#if defined(MBEDTLS_HAVE_TIME)
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200499 {
Manuel Pégourié-Gonnard8eff5122015-05-20 11:41:36 +0200500 /* Check for expiration */
SimonBd5800b72016-04-26 07:43:27 +0100501 mbedtls_time_t current_time = mbedtls_time( NULL );
Manuel Pégourié-Gonnard8eff5122015-05-20 11:41:36 +0200502
503 if( current_time < session->start ||
504 (uint32_t)( current_time - session->start ) > ctx->ticket_lifetime )
505 {
506 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
507 goto cleanup;
508 }
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200509 }
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200510#endif
511
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200512cleanup:
513#if defined(MBEDTLS_THREADING_C)
514 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
515 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
516#endif
517
518 return( ret );
Manuel Pégourié-Gonnarda4a47352015-05-15 15:14:54 +0200519}
520
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200521/*
522 * Free context
523 */
524void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx )
525{
Manuel Pégourié-Gonnard887674a2015-05-25 11:00:19 +0200526 mbedtls_cipher_free( &ctx->keys[0].ctx );
527 mbedtls_cipher_free( &ctx->keys[1].ctx );
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200528
Manuel Pégourié-Gonnard0849a0a2015-05-20 11:34:54 +0200529#if defined(MBEDTLS_THREADING_C)
530 mbedtls_mutex_free( &ctx->mutex );
531#endif
532
Manuel Pégourié-Gonnardd59675d2015-05-19 15:28:00 +0200533 mbedtls_zeroize( ctx, sizeof( mbedtls_ssl_ticket_context ) );
534}
535
Manuel Pégourié-Gonnardfd6d8972015-05-15 12:09:00 +0200536#endif /* MBEDTLS_SSL_TICKET_C */