Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1 | /* |
| 2 | * SSLv3/TLSv1 server-side functions |
| 3 | * |
Paul Bakker | 68884e3 | 2013-01-07 18:20:04 +0100 | [diff] [blame] | 4 | * Copyright (C) 2006-2013, Brainspark B.V. |
Paul Bakker | b96f154 | 2010-07-18 20:36:00 +0000 | [diff] [blame] | 5 | * |
| 6 | * This file is part of PolarSSL (http://www.polarssl.org) |
Paul Bakker | 84f12b7 | 2010-07-18 10:13:04 +0000 | [diff] [blame] | 7 | * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org> |
Paul Bakker | b96f154 | 2010-07-18 20:36:00 +0000 | [diff] [blame] | 8 | * |
Paul Bakker | 77b385e | 2009-07-28 17:23:11 +0000 | [diff] [blame] | 9 | * All rights reserved. |
Paul Bakker | e0ccd0a | 2009-01-04 16:27:10 +0000 | [diff] [blame] | 10 | * |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License along |
| 22 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 23 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 24 | */ |
| 25 | |
Paul Bakker | 40e4694 | 2009-01-03 21:51:57 +0000 | [diff] [blame] | 26 | #include "polarssl/config.h" |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 27 | |
Paul Bakker | 40e4694 | 2009-01-03 21:51:57 +0000 | [diff] [blame] | 28 | #if defined(POLARSSL_SSL_SRV_C) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 29 | |
Paul Bakker | 40e4694 | 2009-01-03 21:51:57 +0000 | [diff] [blame] | 30 | #include "polarssl/debug.h" |
| 31 | #include "polarssl/ssl.h" |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 32 | #if defined(POLARSSL_ECP_C) |
| 33 | #include "polarssl/ecp.h" |
| 34 | #endif |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 35 | |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 36 | #include <stdlib.h> |
| 37 | #include <stdio.h> |
| 38 | #include <time.h> |
| 39 | |
Paul Bakker | 5701cdc | 2012-09-27 21:49:42 +0000 | [diff] [blame] | 40 | static int ssl_parse_servername_ext( ssl_context *ssl, |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 41 | const unsigned char *buf, |
Paul Bakker | 5701cdc | 2012-09-27 21:49:42 +0000 | [diff] [blame] | 42 | size_t len ) |
| 43 | { |
| 44 | int ret; |
| 45 | size_t servername_list_size, hostname_len; |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 46 | const unsigned char *p; |
Paul Bakker | 5701cdc | 2012-09-27 21:49:42 +0000 | [diff] [blame] | 47 | |
| 48 | servername_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) ); |
| 49 | if( servername_list_size + 2 != len ) |
| 50 | { |
| 51 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 52 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 53 | } |
| 54 | |
| 55 | p = buf + 2; |
| 56 | while( servername_list_size > 0 ) |
| 57 | { |
| 58 | hostname_len = ( ( p[1] << 8 ) | p[2] ); |
| 59 | if( hostname_len + 3 > servername_list_size ) |
| 60 | { |
| 61 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 62 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 63 | } |
| 64 | |
| 65 | if( p[0] == TLS_EXT_SERVERNAME_HOSTNAME ) |
| 66 | { |
| 67 | ret = ssl->f_sni( ssl->p_sni, ssl, p + 3, hostname_len ); |
| 68 | if( ret != 0 ) |
| 69 | { |
| 70 | ssl_send_alert_message( ssl, SSL_ALERT_LEVEL_FATAL, |
| 71 | SSL_ALERT_MSG_UNRECOGNIZED_NAME ); |
| 72 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 73 | } |
Paul Bakker | 81420ab | 2012-10-23 10:31:15 +0000 | [diff] [blame] | 74 | return( 0 ); |
Paul Bakker | 5701cdc | 2012-09-27 21:49:42 +0000 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | servername_list_size -= hostname_len + 3; |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 78 | p += hostname_len + 3; |
| 79 | } |
| 80 | |
| 81 | if( servername_list_size != 0 ) |
| 82 | { |
| 83 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 84 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
Paul Bakker | 5701cdc | 2012-09-27 21:49:42 +0000 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | return( 0 ); |
| 88 | } |
| 89 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 90 | static int ssl_parse_renegotiation_info( ssl_context *ssl, |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 91 | const unsigned char *buf, |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 92 | size_t len ) |
| 93 | { |
Paul Bakker | d0f6fa7 | 2012-09-17 09:18:12 +0000 | [diff] [blame] | 94 | int ret; |
| 95 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 96 | if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE ) |
| 97 | { |
| 98 | if( len != 1 || buf[0] != 0x0 ) |
| 99 | { |
| 100 | SSL_DEBUG_MSG( 1, ( "non-zero length renegotiated connection field" ) ); |
Paul Bakker | d0f6fa7 | 2012-09-17 09:18:12 +0000 | [diff] [blame] | 101 | |
| 102 | if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| 103 | return( ret ); |
| 104 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 105 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 106 | } |
| 107 | |
| 108 | ssl->secure_renegotiation = SSL_SECURE_RENEGOTIATION; |
| 109 | } |
| 110 | else |
| 111 | { |
| 112 | if( len != 1 + ssl->verify_data_len || |
| 113 | buf[0] != ssl->verify_data_len || |
| 114 | memcmp( buf + 1, ssl->peer_verify_data, ssl->verify_data_len ) != 0 ) |
| 115 | { |
| 116 | SSL_DEBUG_MSG( 1, ( "non-matching renegotiated connection field" ) ); |
Paul Bakker | d0f6fa7 | 2012-09-17 09:18:12 +0000 | [diff] [blame] | 117 | |
| 118 | if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| 119 | return( ret ); |
| 120 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 121 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | return( 0 ); |
| 126 | } |
| 127 | |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 128 | static int ssl_parse_signature_algorithms_ext( ssl_context *ssl, |
| 129 | const unsigned char *buf, |
| 130 | size_t len ) |
| 131 | { |
| 132 | size_t sig_alg_list_size; |
| 133 | const unsigned char *p; |
| 134 | |
| 135 | sig_alg_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) ); |
| 136 | if( sig_alg_list_size + 2 != len || |
| 137 | sig_alg_list_size %2 != 0 ) |
| 138 | { |
| 139 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 140 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 141 | } |
| 142 | |
| 143 | p = buf + 2; |
| 144 | while( sig_alg_list_size > 0 ) |
| 145 | { |
| 146 | if( p[1] != SSL_SIG_RSA ) |
Paul Bakker | 8611e73 | 2012-10-30 07:52:29 +0000 | [diff] [blame] | 147 | { |
| 148 | sig_alg_list_size -= 2; |
| 149 | p += 2; |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 150 | continue; |
Paul Bakker | 8611e73 | 2012-10-30 07:52:29 +0000 | [diff] [blame] | 151 | } |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 152 | #if defined(POLARSSL_SHA4_C) |
| 153 | if( p[0] == SSL_HASH_SHA512 ) |
| 154 | { |
| 155 | ssl->handshake->sig_alg = SSL_HASH_SHA512; |
| 156 | break; |
| 157 | } |
| 158 | if( p[0] == SSL_HASH_SHA384 ) |
| 159 | { |
| 160 | ssl->handshake->sig_alg = SSL_HASH_SHA384; |
| 161 | break; |
| 162 | } |
| 163 | #endif |
| 164 | #if defined(POLARSSL_SHA2_C) |
| 165 | if( p[0] == SSL_HASH_SHA256 ) |
| 166 | { |
| 167 | ssl->handshake->sig_alg = SSL_HASH_SHA256; |
| 168 | break; |
| 169 | } |
| 170 | if( p[0] == SSL_HASH_SHA224 ) |
| 171 | { |
| 172 | ssl->handshake->sig_alg = SSL_HASH_SHA224; |
| 173 | break; |
| 174 | } |
| 175 | #endif |
| 176 | if( p[0] == SSL_HASH_SHA1 ) |
| 177 | { |
| 178 | ssl->handshake->sig_alg = SSL_HASH_SHA1; |
| 179 | break; |
| 180 | } |
| 181 | if( p[0] == SSL_HASH_MD5 ) |
| 182 | { |
| 183 | ssl->handshake->sig_alg = SSL_HASH_MD5; |
| 184 | break; |
| 185 | } |
| 186 | |
| 187 | sig_alg_list_size -= 2; |
| 188 | p += 2; |
| 189 | } |
| 190 | |
| 191 | SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: %d", |
| 192 | ssl->handshake->sig_alg ) ); |
| 193 | |
| 194 | return( 0 ); |
| 195 | } |
| 196 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 197 | #if defined(POLARSSL_ECP_C) |
Paul Bakker | b6c5d2e | 2013-06-25 16:25:17 +0200 | [diff] [blame] | 198 | static int ssl_parse_supported_elliptic_curves( ssl_context *ssl, |
| 199 | const unsigned char *buf, |
| 200 | size_t len ) |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 201 | { |
| 202 | size_t list_size; |
| 203 | const unsigned char *p; |
| 204 | |
| 205 | list_size = ( ( buf[0] << 8 ) | ( buf[1] ) ); |
| 206 | if( list_size + 2 != len || |
| 207 | list_size % 2 != 0 ) |
| 208 | { |
| 209 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 210 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 211 | } |
| 212 | |
| 213 | p = buf + 2; |
| 214 | while( list_size > 0 ) |
| 215 | { |
Paul Bakker | 5dc6b5f | 2013-06-29 23:26:34 +0200 | [diff] [blame^] | 216 | #if defined(POLARSSL_ECP_DP_SECP192R1_ENABLED) |
| 217 | if( p[0] == 0x00 && p[1] == POLARSSL_ECP_DP_SECP192R1 ) |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 218 | { |
| 219 | ssl->handshake->ec_curve = p[1]; |
| 220 | return( 0 ); |
| 221 | } |
Paul Bakker | 5dc6b5f | 2013-06-29 23:26:34 +0200 | [diff] [blame^] | 222 | #endif |
| 223 | #if defined(POLARSSL_ECP_DP_SECP224R1_ENABLED) |
| 224 | if( p[0] == 0x00 && p[1] == POLARSSL_ECP_DP_SECP224R1 ) |
| 225 | { |
| 226 | ssl->handshake->ec_curve = p[1]; |
| 227 | return( 0 ); |
| 228 | } |
| 229 | #endif |
| 230 | #if defined(POLARSSL_ECP_DP_SECP256R1_ENABLED) |
| 231 | if( p[0] == 0x00 && p[1] == POLARSSL_ECP_DP_SECP256R1 ) |
| 232 | { |
| 233 | ssl->handshake->ec_curve = p[1]; |
| 234 | return( 0 ); |
| 235 | } |
| 236 | #endif |
| 237 | #if defined(POLARSSL_ECP_DP_SECP384R1_ENABLED) |
| 238 | if( p[0] == 0x00 && p[1] == POLARSSL_ECP_DP_SECP384R1 ) |
| 239 | { |
| 240 | ssl->handshake->ec_curve = p[1]; |
| 241 | return( 0 ); |
| 242 | } |
| 243 | #endif |
| 244 | #if defined(POLARSSL_ECP_DP_SECP521R1_ENABLED) |
| 245 | if( p[0] == 0x00 && p[1] == POLARSSL_ECP_DP_SECP521R1 ) |
| 246 | { |
| 247 | ssl->handshake->ec_curve = p[1]; |
| 248 | return( 0 ); |
| 249 | } |
| 250 | #endif |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 251 | |
| 252 | list_size -= 2; |
| 253 | p += 2; |
| 254 | } |
| 255 | |
| 256 | return( 0 ); |
| 257 | } |
| 258 | |
Paul Bakker | b6c5d2e | 2013-06-25 16:25:17 +0200 | [diff] [blame] | 259 | static int ssl_parse_supported_point_formats( ssl_context *ssl, |
| 260 | const unsigned char *buf, |
| 261 | size_t len ) |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 262 | { |
| 263 | size_t list_size; |
| 264 | const unsigned char *p; |
| 265 | |
| 266 | list_size = buf[0]; |
| 267 | if( list_size + 1 != len ) |
| 268 | { |
| 269 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 270 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 271 | } |
| 272 | |
| 273 | p = buf + 2; |
| 274 | while( list_size > 0 ) |
| 275 | { |
| 276 | if( p[0] == POLARSSL_ECP_PF_UNCOMPRESSED || |
| 277 | p[0] == POLARSSL_ECP_PF_COMPRESSED ) |
| 278 | { |
| 279 | ssl->handshake->ec_point_format = p[0]; |
| 280 | return( 0 ); |
| 281 | } |
| 282 | |
| 283 | list_size--; |
| 284 | p++; |
| 285 | } |
| 286 | |
| 287 | return( 0 ); |
| 288 | } |
| 289 | #endif /* POLARSSL_ECP_C */ |
| 290 | |
Paul Bakker | 78a8c71 | 2013-03-06 17:01:52 +0100 | [diff] [blame] | 291 | #if defined(POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO) |
| 292 | static int ssl_parse_client_hello_v2( ssl_context *ssl ) |
| 293 | { |
| 294 | int ret; |
| 295 | unsigned int i, j; |
| 296 | size_t n; |
| 297 | unsigned int ciph_len, sess_len, chal_len; |
| 298 | unsigned char *buf, *p; |
Paul Bakker | 8f4ddae | 2013-04-15 15:09:54 +0200 | [diff] [blame] | 299 | const int *ciphersuites; |
Paul Bakker | 59c28a2 | 2013-06-29 15:33:42 +0200 | [diff] [blame] | 300 | const ssl_ciphersuite_t *ciphersuite_info; |
Paul Bakker | 78a8c71 | 2013-03-06 17:01:52 +0100 | [diff] [blame] | 301 | |
| 302 | SSL_DEBUG_MSG( 2, ( "=> parse client hello v2" ) ); |
| 303 | |
| 304 | if( ssl->renegotiation != SSL_INITIAL_HANDSHAKE ) |
| 305 | { |
| 306 | SSL_DEBUG_MSG( 1, ( "client hello v2 illegal for renegotiation" ) ); |
| 307 | |
| 308 | if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| 309 | return( ret ); |
| 310 | |
| 311 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 312 | } |
| 313 | |
| 314 | buf = ssl->in_hdr; |
| 315 | |
| 316 | SSL_DEBUG_BUF( 4, "record header", buf, 5 ); |
| 317 | |
| 318 | SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d", |
| 319 | buf[2] ) ); |
| 320 | SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d", |
| 321 | ( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) ); |
| 322 | SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]", |
| 323 | buf[3], buf[4] ) ); |
| 324 | |
| 325 | /* |
| 326 | * SSLv2 Client Hello |
| 327 | * |
| 328 | * Record layer: |
| 329 | * 0 . 1 message length |
| 330 | * |
| 331 | * SSL layer: |
| 332 | * 2 . 2 message type |
| 333 | * 3 . 4 protocol version |
| 334 | */ |
| 335 | if( buf[2] != SSL_HS_CLIENT_HELLO || |
| 336 | buf[3] != SSL_MAJOR_VERSION_3 ) |
| 337 | { |
| 338 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 339 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 340 | } |
| 341 | |
| 342 | n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF; |
| 343 | |
| 344 | if( n < 17 || n > 512 ) |
| 345 | { |
| 346 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 347 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 348 | } |
| 349 | |
| 350 | ssl->major_ver = SSL_MAJOR_VERSION_3; |
Paul Bakker | 2fbefde | 2013-06-29 16:01:15 +0200 | [diff] [blame] | 351 | ssl->minor_ver = ( buf[4] <= ssl->max_minor_ver ) |
| 352 | ? buf[4] : ssl->max_minor_ver; |
Paul Bakker | 78a8c71 | 2013-03-06 17:01:52 +0100 | [diff] [blame] | 353 | |
| 354 | if( ssl->minor_ver < ssl->min_minor_ver ) |
| 355 | { |
| 356 | SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum" |
| 357 | " [%d:%d] < [%d:%d]", ssl->major_ver, ssl->minor_ver, |
| 358 | ssl->min_major_ver, ssl->min_minor_ver ) ); |
| 359 | |
| 360 | ssl_send_alert_message( ssl, SSL_ALERT_LEVEL_FATAL, |
| 361 | SSL_ALERT_MSG_PROTOCOL_VERSION ); |
| 362 | return( POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); |
| 363 | } |
| 364 | |
Paul Bakker | 2fbefde | 2013-06-29 16:01:15 +0200 | [diff] [blame] | 365 | ssl->handshake->max_major_ver = buf[3]; |
| 366 | ssl->handshake->max_minor_ver = buf[4]; |
Paul Bakker | 78a8c71 | 2013-03-06 17:01:52 +0100 | [diff] [blame] | 367 | |
| 368 | if( ( ret = ssl_fetch_input( ssl, 2 + n ) ) != 0 ) |
| 369 | { |
| 370 | SSL_DEBUG_RET( 1, "ssl_fetch_input", ret ); |
| 371 | return( ret ); |
| 372 | } |
| 373 | |
| 374 | ssl->handshake->update_checksum( ssl, buf + 2, n ); |
| 375 | |
| 376 | buf = ssl->in_msg; |
| 377 | n = ssl->in_left - 5; |
| 378 | |
| 379 | /* |
| 380 | * 0 . 1 ciphersuitelist length |
| 381 | * 2 . 3 session id length |
| 382 | * 4 . 5 challenge length |
| 383 | * 6 . .. ciphersuitelist |
| 384 | * .. . .. session id |
| 385 | * .. . .. challenge |
| 386 | */ |
| 387 | SSL_DEBUG_BUF( 4, "record contents", buf, n ); |
| 388 | |
| 389 | ciph_len = ( buf[0] << 8 ) | buf[1]; |
| 390 | sess_len = ( buf[2] << 8 ) | buf[3]; |
| 391 | chal_len = ( buf[4] << 8 ) | buf[5]; |
| 392 | |
| 393 | SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d", |
| 394 | ciph_len, sess_len, chal_len ) ); |
| 395 | |
| 396 | /* |
| 397 | * Make sure each parameter length is valid |
| 398 | */ |
| 399 | if( ciph_len < 3 || ( ciph_len % 3 ) != 0 ) |
| 400 | { |
| 401 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 402 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 403 | } |
| 404 | |
| 405 | if( sess_len > 32 ) |
| 406 | { |
| 407 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 408 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 409 | } |
| 410 | |
| 411 | if( chal_len < 8 || chal_len > 32 ) |
| 412 | { |
| 413 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 414 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 415 | } |
| 416 | |
| 417 | if( n != 6 + ciph_len + sess_len + chal_len ) |
| 418 | { |
| 419 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 420 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 421 | } |
| 422 | |
| 423 | SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", |
| 424 | buf + 6, ciph_len ); |
| 425 | SSL_DEBUG_BUF( 3, "client hello, session id", |
| 426 | buf + 6 + ciph_len, sess_len ); |
| 427 | SSL_DEBUG_BUF( 3, "client hello, challenge", |
| 428 | buf + 6 + ciph_len + sess_len, chal_len ); |
| 429 | |
| 430 | p = buf + 6 + ciph_len; |
| 431 | ssl->session_negotiate->length = sess_len; |
| 432 | memset( ssl->session_negotiate->id, 0, sizeof( ssl->session_negotiate->id ) ); |
| 433 | memcpy( ssl->session_negotiate->id, p, ssl->session_negotiate->length ); |
| 434 | |
| 435 | p += sess_len; |
| 436 | memset( ssl->handshake->randbytes, 0, 64 ); |
| 437 | memcpy( ssl->handshake->randbytes + 32 - chal_len, p, chal_len ); |
| 438 | |
| 439 | /* |
| 440 | * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV |
| 441 | */ |
| 442 | for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 ) |
| 443 | { |
| 444 | if( p[0] == 0 && p[1] == 0 && p[2] == SSL_EMPTY_RENEGOTIATION_INFO ) |
| 445 | { |
| 446 | SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) ); |
| 447 | if( ssl->renegotiation == SSL_RENEGOTIATION ) |
| 448 | { |
| 449 | SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV during renegotiation" ) ); |
| 450 | |
| 451 | if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| 452 | return( ret ); |
| 453 | |
| 454 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 455 | } |
| 456 | ssl->secure_renegotiation = SSL_SECURE_RENEGOTIATION; |
| 457 | break; |
| 458 | } |
| 459 | } |
| 460 | |
Paul Bakker | 8f4ddae | 2013-04-15 15:09:54 +0200 | [diff] [blame] | 461 | ciphersuites = ssl->ciphersuite_list[ssl->minor_ver]; |
| 462 | for( i = 0; ciphersuites[i] != 0; i++ ) |
Paul Bakker | 78a8c71 | 2013-03-06 17:01:52 +0100 | [diff] [blame] | 463 | { |
| 464 | for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 ) |
| 465 | { |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 466 | // Only allow non-ECC ciphersuites as we do not have extensions |
| 467 | // |
Paul Bakker | 59c28a2 | 2013-06-29 15:33:42 +0200 | [diff] [blame] | 468 | if( p[0] == 0 && p[1] == 0 && |
Paul Bakker | 8f4ddae | 2013-04-15 15:09:54 +0200 | [diff] [blame] | 469 | ( ( ciphersuites[i] >> 8 ) & 0xFF ) == 0 && |
| 470 | p[2] == ( ciphersuites[i] & 0xFF ) ) |
Paul Bakker | 59c28a2 | 2013-06-29 15:33:42 +0200 | [diff] [blame] | 471 | { |
| 472 | ciphersuite_info = ssl_ciphersuite_from_id( ciphersuites[i] ); |
| 473 | |
| 474 | if( ciphersuite_info == NULL ) |
| 475 | { |
| 476 | SSL_DEBUG_MSG( 1, ( "ciphersuite info for %02x not found", |
| 477 | ciphersuites[i] ) ); |
| 478 | return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); |
| 479 | } |
| 480 | |
Paul Bakker | 2fbefde | 2013-06-29 16:01:15 +0200 | [diff] [blame] | 481 | if( ciphersuite_info->min_minor_ver > ssl->minor_ver || |
| 482 | ciphersuite_info->max_minor_ver < ssl->minor_ver ) |
| 483 | continue; |
Paul Bakker | 59c28a2 | 2013-06-29 15:33:42 +0200 | [diff] [blame] | 484 | |
Paul Bakker | 78a8c71 | 2013-03-06 17:01:52 +0100 | [diff] [blame] | 485 | goto have_ciphersuite_v2; |
Paul Bakker | 59c28a2 | 2013-06-29 15:33:42 +0200 | [diff] [blame] | 486 | } |
Paul Bakker | 78a8c71 | 2013-03-06 17:01:52 +0100 | [diff] [blame] | 487 | } |
| 488 | } |
| 489 | |
| 490 | SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) ); |
| 491 | |
| 492 | return( POLARSSL_ERR_SSL_NO_CIPHER_CHOSEN ); |
| 493 | |
| 494 | have_ciphersuite_v2: |
Paul Bakker | 8f4ddae | 2013-04-15 15:09:54 +0200 | [diff] [blame] | 495 | ssl->session_negotiate->ciphersuite = ciphersuites[i]; |
Paul Bakker | 59c28a2 | 2013-06-29 15:33:42 +0200 | [diff] [blame] | 496 | ssl->transform_negotiate->ciphersuite_info = ciphersuite_info; |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 497 | ssl_optimize_checksum( ssl, ssl->transform_negotiate->ciphersuite_info ); |
Paul Bakker | 78a8c71 | 2013-03-06 17:01:52 +0100 | [diff] [blame] | 498 | |
| 499 | /* |
| 500 | * SSLv2 Client Hello relevant renegotiation security checks |
| 501 | */ |
| 502 | if( ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION && |
| 503 | ssl->allow_legacy_renegotiation == SSL_LEGACY_BREAK_HANDSHAKE ) |
| 504 | { |
| 505 | SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) ); |
| 506 | |
| 507 | if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| 508 | return( ret ); |
| 509 | |
| 510 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 511 | } |
| 512 | |
| 513 | ssl->in_left = 0; |
| 514 | ssl->state++; |
| 515 | |
| 516 | SSL_DEBUG_MSG( 2, ( "<= parse client hello v2" ) ); |
| 517 | |
| 518 | return( 0 ); |
| 519 | } |
| 520 | #endif /* POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */ |
| 521 | |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 522 | static int ssl_parse_client_hello( ssl_context *ssl ) |
| 523 | { |
Paul Bakker | 23986e5 | 2011-04-24 08:57:21 +0000 | [diff] [blame] | 524 | int ret; |
| 525 | unsigned int i, j; |
| 526 | size_t n; |
| 527 | unsigned int ciph_len, sess_len; |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 528 | unsigned int comp_len; |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 529 | unsigned int ext_len = 0; |
| 530 | unsigned char *buf, *p, *ext; |
Paul Bakker | d0f6fa7 | 2012-09-17 09:18:12 +0000 | [diff] [blame] | 531 | int renegotiation_info_seen = 0; |
| 532 | int handshake_failure = 0; |
Paul Bakker | 8f4ddae | 2013-04-15 15:09:54 +0200 | [diff] [blame] | 533 | const int *ciphersuites; |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 534 | const ssl_ciphersuite_t *ciphersuite_info; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 535 | |
| 536 | SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) ); |
| 537 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 538 | if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE && |
| 539 | ( ret = ssl_fetch_input( ssl, 5 ) ) != 0 ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 540 | { |
| 541 | SSL_DEBUG_RET( 1, "ssl_fetch_input", ret ); |
| 542 | return( ret ); |
| 543 | } |
| 544 | |
| 545 | buf = ssl->in_hdr; |
| 546 | |
Paul Bakker | 78a8c71 | 2013-03-06 17:01:52 +0100 | [diff] [blame] | 547 | #if defined(POLARSSL_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO) |
| 548 | if( ( buf[0] & 0x80 ) != 0 ) |
| 549 | return ssl_parse_client_hello_v2( ssl ); |
| 550 | #endif |
| 551 | |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 552 | SSL_DEBUG_BUF( 4, "record header", buf, 5 ); |
| 553 | |
| 554 | SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d", |
| 555 | buf[0] ) ); |
| 556 | SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d", |
| 557 | ( buf[3] << 8 ) | buf[4] ) ); |
| 558 | SSL_DEBUG_MSG( 3, ( "client hello v3, protocol ver: [%d:%d]", |
| 559 | buf[1], buf[2] ) ); |
| 560 | |
| 561 | /* |
| 562 | * SSLv3 Client Hello |
| 563 | * |
| 564 | * Record layer: |
| 565 | * 0 . 0 message type |
| 566 | * 1 . 2 protocol version |
| 567 | * 3 . 4 message length |
| 568 | */ |
| 569 | if( buf[0] != SSL_MSG_HANDSHAKE || |
| 570 | buf[1] != SSL_MAJOR_VERSION_3 ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 571 | { |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 572 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 573 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 574 | } |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 575 | |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 576 | n = ( buf[3] << 8 ) | buf[4]; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 577 | |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 578 | if( n < 45 || n > 512 ) |
| 579 | { |
| 580 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 581 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 582 | } |
| 583 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 584 | if( ssl->renegotiation == SSL_INITIAL_HANDSHAKE && |
| 585 | ( ret = ssl_fetch_input( ssl, 5 + n ) ) != 0 ) |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 586 | { |
| 587 | SSL_DEBUG_RET( 1, "ssl_fetch_input", ret ); |
| 588 | return( ret ); |
| 589 | } |
| 590 | |
| 591 | buf = ssl->in_msg; |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 592 | if( !ssl->renegotiation ) |
| 593 | n = ssl->in_left - 5; |
| 594 | else |
| 595 | n = ssl->in_msglen; |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 596 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 597 | ssl->handshake->update_checksum( ssl, buf, n ); |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 598 | |
| 599 | /* |
| 600 | * SSL layer: |
| 601 | * 0 . 0 handshake type |
| 602 | * 1 . 3 handshake length |
| 603 | * 4 . 5 protocol version |
| 604 | * 6 . 9 UNIX time() |
| 605 | * 10 . 37 random bytes |
| 606 | * 38 . 38 session id length |
| 607 | * 39 . 38+x session id |
| 608 | * 39+x . 40+x ciphersuitelist length |
| 609 | * 41+x . .. ciphersuitelist |
| 610 | * .. . .. compression alg. |
| 611 | * .. . .. extensions |
| 612 | */ |
| 613 | SSL_DEBUG_BUF( 4, "record contents", buf, n ); |
| 614 | |
| 615 | SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", |
| 616 | buf[0] ) ); |
| 617 | SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d", |
| 618 | ( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) ); |
| 619 | SSL_DEBUG_MSG( 3, ( "client hello v3, max. version: [%d:%d]", |
| 620 | buf[4], buf[5] ) ); |
| 621 | |
| 622 | /* |
| 623 | * Check the handshake type and protocol version |
| 624 | */ |
| 625 | if( buf[0] != SSL_HS_CLIENT_HELLO || |
| 626 | buf[4] != SSL_MAJOR_VERSION_3 ) |
| 627 | { |
| 628 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 629 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 630 | } |
| 631 | |
| 632 | ssl->major_ver = SSL_MAJOR_VERSION_3; |
Paul Bakker | 2fbefde | 2013-06-29 16:01:15 +0200 | [diff] [blame] | 633 | ssl->minor_ver = ( buf[5] <= ssl->max_minor_ver ) |
| 634 | ? buf[5] : ssl->max_minor_ver; |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 635 | |
Paul Bakker | 1d29fb5 | 2012-09-28 13:28:45 +0000 | [diff] [blame] | 636 | if( ssl->minor_ver < ssl->min_minor_ver ) |
| 637 | { |
| 638 | SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum" |
| 639 | " [%d:%d] < [%d:%d]", ssl->major_ver, ssl->minor_ver, |
Paul Bakker | 81420ab | 2012-10-23 10:31:15 +0000 | [diff] [blame] | 640 | ssl->min_major_ver, ssl->min_minor_ver ) ); |
Paul Bakker | 1d29fb5 | 2012-09-28 13:28:45 +0000 | [diff] [blame] | 641 | |
| 642 | ssl_send_alert_message( ssl, SSL_ALERT_LEVEL_FATAL, |
| 643 | SSL_ALERT_MSG_PROTOCOL_VERSION ); |
| 644 | |
| 645 | return( POLARSSL_ERR_SSL_BAD_HS_PROTOCOL_VERSION ); |
| 646 | } |
| 647 | |
Paul Bakker | 2fbefde | 2013-06-29 16:01:15 +0200 | [diff] [blame] | 648 | ssl->handshake->max_major_ver = buf[4]; |
| 649 | ssl->handshake->max_minor_ver = buf[5]; |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 650 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 651 | memcpy( ssl->handshake->randbytes, buf + 6, 32 ); |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 652 | |
| 653 | /* |
| 654 | * Check the handshake message length |
| 655 | */ |
| 656 | if( buf[1] != 0 || n != (unsigned int) 4 + ( ( buf[2] << 8 ) | buf[3] ) ) |
| 657 | { |
| 658 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 659 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 660 | } |
| 661 | |
| 662 | /* |
| 663 | * Check the session length |
| 664 | */ |
| 665 | sess_len = buf[38]; |
| 666 | |
| 667 | if( sess_len > 32 ) |
| 668 | { |
| 669 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 670 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 671 | } |
| 672 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 673 | ssl->session_negotiate->length = sess_len; |
| 674 | memset( ssl->session_negotiate->id, 0, |
| 675 | sizeof( ssl->session_negotiate->id ) ); |
| 676 | memcpy( ssl->session_negotiate->id, buf + 39, |
| 677 | ssl->session_negotiate->length ); |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 678 | |
| 679 | /* |
| 680 | * Check the ciphersuitelist length |
| 681 | */ |
| 682 | ciph_len = ( buf[39 + sess_len] << 8 ) |
| 683 | | ( buf[40 + sess_len] ); |
| 684 | |
| 685 | if( ciph_len < 2 || ciph_len > 256 || ( ciph_len % 2 ) != 0 ) |
| 686 | { |
| 687 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 688 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * Check the compression algorithms length |
| 693 | */ |
| 694 | comp_len = buf[41 + sess_len + ciph_len]; |
| 695 | |
| 696 | if( comp_len < 1 || comp_len > 16 ) |
| 697 | { |
| 698 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 699 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 700 | } |
| 701 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 702 | /* |
| 703 | * Check the extension length |
| 704 | */ |
| 705 | if( n > 42 + sess_len + ciph_len + comp_len ) |
| 706 | { |
| 707 | ext_len = ( buf[42 + sess_len + ciph_len + comp_len] << 8 ) |
| 708 | | ( buf[43 + sess_len + ciph_len + comp_len] ); |
| 709 | |
| 710 | if( ( ext_len > 0 && ext_len < 4 ) || |
| 711 | n != 44 + sess_len + ciph_len + comp_len + ext_len ) |
| 712 | { |
| 713 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 714 | SSL_DEBUG_BUF( 3, "Ext", buf + 44 + sess_len + ciph_len + comp_len, ext_len); |
| 715 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 716 | } |
| 717 | } |
| 718 | |
| 719 | ssl->session_negotiate->compression = SSL_COMPRESS_NULL; |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 720 | #if defined(POLARSSL_ZLIB_SUPPORT) |
| 721 | for( i = 0; i < comp_len; ++i ) |
| 722 | { |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 723 | if( buf[42 + sess_len + ciph_len + i] == SSL_COMPRESS_DEFLATE ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 724 | { |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 725 | ssl->session_negotiate->compression = SSL_COMPRESS_DEFLATE; |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 726 | break; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 727 | } |
| 728 | } |
Paul Bakker | 2770fbd | 2012-07-03 13:30:23 +0000 | [diff] [blame] | 729 | #endif |
| 730 | |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 731 | SSL_DEBUG_BUF( 3, "client hello, random bytes", |
| 732 | buf + 6, 32 ); |
| 733 | SSL_DEBUG_BUF( 3, "client hello, session id", |
| 734 | buf + 38, sess_len ); |
| 735 | SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist", |
| 736 | buf + 41 + sess_len, ciph_len ); |
| 737 | SSL_DEBUG_BUF( 3, "client hello, compression", |
| 738 | buf + 42 + sess_len + ciph_len, comp_len ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 739 | |
Paul Bakker | ec636f3 | 2012-09-09 19:17:02 +0000 | [diff] [blame] | 740 | /* |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 741 | * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV |
| 742 | */ |
| 743 | for( i = 0, p = buf + 41 + sess_len; i < ciph_len; i += 2, p += 2 ) |
| 744 | { |
| 745 | if( p[0] == 0 && p[1] == SSL_EMPTY_RENEGOTIATION_INFO ) |
| 746 | { |
| 747 | SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) ); |
| 748 | if( ssl->renegotiation == SSL_RENEGOTIATION ) |
| 749 | { |
| 750 | SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV during renegotiation" ) ); |
Paul Bakker | d0f6fa7 | 2012-09-17 09:18:12 +0000 | [diff] [blame] | 751 | |
| 752 | if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| 753 | return( ret ); |
| 754 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 755 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 756 | } |
| 757 | ssl->secure_renegotiation = SSL_SECURE_RENEGOTIATION; |
| 758 | break; |
| 759 | } |
| 760 | } |
| 761 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 762 | ext = buf + 44 + sess_len + ciph_len + comp_len; |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 763 | |
| 764 | while( ext_len ) |
| 765 | { |
| 766 | unsigned int ext_id = ( ( ext[0] << 8 ) |
| 767 | | ( ext[1] ) ); |
| 768 | unsigned int ext_size = ( ( ext[2] << 8 ) |
| 769 | | ( ext[3] ) ); |
| 770 | |
| 771 | if( ext_size + 4 > ext_len ) |
| 772 | { |
| 773 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 774 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 775 | } |
| 776 | switch( ext_id ) |
| 777 | { |
Paul Bakker | 5701cdc | 2012-09-27 21:49:42 +0000 | [diff] [blame] | 778 | case TLS_EXT_SERVERNAME: |
| 779 | SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) ); |
| 780 | if( ssl->f_sni == NULL ) |
| 781 | break; |
| 782 | |
| 783 | ret = ssl_parse_servername_ext( ssl, ext + 4, ext_size ); |
| 784 | if( ret != 0 ) |
| 785 | return( ret ); |
| 786 | break; |
| 787 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 788 | case TLS_EXT_RENEGOTIATION_INFO: |
| 789 | SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) ); |
| 790 | renegotiation_info_seen = 1; |
| 791 | |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 792 | ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size ); |
| 793 | if( ret != 0 ) |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 794 | return( ret ); |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 795 | break; |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 796 | |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 797 | case TLS_EXT_SIG_ALG: |
| 798 | SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) ); |
| 799 | if( ssl->renegotiation == SSL_RENEGOTIATION ) |
| 800 | break; |
| 801 | |
| 802 | ret = ssl_parse_signature_algorithms_ext( ssl, ext + 4, ext_size ); |
| 803 | if( ret != 0 ) |
| 804 | return( ret ); |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 805 | break; |
| 806 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 807 | #if defined(POLARSSL_ECP_C) |
| 808 | case TLS_EXT_SUPPORTED_ELLIPTIC_CURVES: |
| 809 | SSL_DEBUG_MSG( 3, ( "found supported elliptic curves extension" ) ); |
| 810 | |
| 811 | ret = ssl_parse_supported_elliptic_curves( ssl, ext + 4, ext_size ); |
| 812 | if( ret != 0 ) |
| 813 | return( ret ); |
| 814 | break; |
| 815 | |
| 816 | case TLS_EXT_SUPPORTED_POINT_FORMATS: |
| 817 | SSL_DEBUG_MSG( 3, ( "found supported point formats extension" ) ); |
| 818 | |
| 819 | ret = ssl_parse_supported_point_formats( ssl, ext + 4, ext_size ); |
| 820 | if( ret != 0 ) |
| 821 | return( ret ); |
| 822 | break; |
| 823 | #endif /* POLARSSL_ECP_C */ |
| 824 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 825 | default: |
| 826 | SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)", |
| 827 | ext_id ) ); |
| 828 | } |
| 829 | |
| 830 | ext_len -= 4 + ext_size; |
| 831 | ext += 4 + ext_size; |
| 832 | |
| 833 | if( ext_len > 0 && ext_len < 4 ) |
| 834 | { |
| 835 | SSL_DEBUG_MSG( 1, ( "bad client hello message" ) ); |
| 836 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 837 | } |
| 838 | } |
| 839 | |
| 840 | /* |
| 841 | * Renegotiation security checks |
| 842 | */ |
Paul Bakker | d0f6fa7 | 2012-09-17 09:18:12 +0000 | [diff] [blame] | 843 | if( ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION && |
| 844 | ssl->allow_legacy_renegotiation == SSL_LEGACY_BREAK_HANDSHAKE ) |
| 845 | { |
| 846 | SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) ); |
| 847 | handshake_failure = 1; |
| 848 | } |
| 849 | else if( ssl->renegotiation == SSL_RENEGOTIATION && |
| 850 | ssl->secure_renegotiation == SSL_SECURE_RENEGOTIATION && |
| 851 | renegotiation_info_seen == 0 ) |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 852 | { |
| 853 | SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) ); |
Paul Bakker | d0f6fa7 | 2012-09-17 09:18:12 +0000 | [diff] [blame] | 854 | handshake_failure = 1; |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 855 | } |
Paul Bakker | d0f6fa7 | 2012-09-17 09:18:12 +0000 | [diff] [blame] | 856 | else if( ssl->renegotiation == SSL_RENEGOTIATION && |
| 857 | ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION && |
| 858 | ssl->allow_legacy_renegotiation == SSL_LEGACY_NO_RENEGOTIATION ) |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 859 | { |
| 860 | SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) ); |
Paul Bakker | d0f6fa7 | 2012-09-17 09:18:12 +0000 | [diff] [blame] | 861 | handshake_failure = 1; |
| 862 | } |
| 863 | else if( ssl->renegotiation == SSL_RENEGOTIATION && |
| 864 | ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION && |
| 865 | renegotiation_info_seen == 1 ) |
| 866 | { |
| 867 | SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) ); |
| 868 | handshake_failure = 1; |
| 869 | } |
| 870 | |
| 871 | if( handshake_failure == 1 ) |
| 872 | { |
| 873 | if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| 874 | return( ret ); |
| 875 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 876 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_HELLO ); |
| 877 | } |
Paul Bakker | 380da53 | 2012-04-18 16:10:25 +0000 | [diff] [blame] | 878 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 879 | /* |
| 880 | * Search for a matching ciphersuite |
| 881 | * (At the end because we need information from the EC-based extensions) |
| 882 | */ |
Paul Bakker | 8f4ddae | 2013-04-15 15:09:54 +0200 | [diff] [blame] | 883 | ciphersuites = ssl->ciphersuite_list[ssl->minor_ver]; |
| 884 | for( i = 0; ciphersuites[i] != 0; i++ ) |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 885 | { |
| 886 | for( j = 0, p = buf + 41 + sess_len; j < ciph_len; |
| 887 | j += 2, p += 2 ) |
| 888 | { |
Paul Bakker | 8f4ddae | 2013-04-15 15:09:54 +0200 | [diff] [blame] | 889 | if( p[0] == ( ( ciphersuites[i] >> 8 ) & 0xFF ) && |
| 890 | p[1] == ( ( ciphersuites[i] ) & 0xFF ) ) |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 891 | { |
Paul Bakker | 8f4ddae | 2013-04-15 15:09:54 +0200 | [diff] [blame] | 892 | ciphersuite_info = ssl_ciphersuite_from_id( ciphersuites[i] ); |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 893 | |
| 894 | if( ciphersuite_info == NULL ) |
| 895 | { |
| 896 | SSL_DEBUG_MSG( 1, ( "ciphersuite info for %02x not found", |
Paul Bakker | 8f4ddae | 2013-04-15 15:09:54 +0200 | [diff] [blame] | 897 | ciphersuites[i] ) ); |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 898 | return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); |
| 899 | } |
| 900 | |
Paul Bakker | 2fbefde | 2013-06-29 16:01:15 +0200 | [diff] [blame] | 901 | if( ciphersuite_info->min_minor_ver > ssl->minor_ver || |
| 902 | ciphersuite_info->max_minor_ver < ssl->minor_ver ) |
| 903 | continue; |
| 904 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 905 | if( ( ciphersuite_info->flags & POLARSSL_CIPHERSUITE_EC ) && |
| 906 | ssl->handshake->ec_curve == 0 ) |
| 907 | continue; |
| 908 | |
| 909 | goto have_ciphersuite; |
| 910 | } |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) ); |
| 915 | |
| 916 | if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) |
| 917 | return( ret ); |
| 918 | |
| 919 | return( POLARSSL_ERR_SSL_NO_CIPHER_CHOSEN ); |
| 920 | |
| 921 | have_ciphersuite: |
Paul Bakker | 8f4ddae | 2013-04-15 15:09:54 +0200 | [diff] [blame] | 922 | ssl->session_negotiate->ciphersuite = ciphersuites[i]; |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 923 | ssl->transform_negotiate->ciphersuite_info = ciphersuite_info; |
| 924 | ssl_optimize_checksum( ssl, ssl->transform_negotiate->ciphersuite_info ); |
| 925 | |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 926 | ssl->in_left = 0; |
| 927 | ssl->state++; |
| 928 | |
| 929 | SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) ); |
| 930 | |
| 931 | return( 0 ); |
| 932 | } |
| 933 | |
| 934 | static int ssl_write_server_hello( ssl_context *ssl ) |
| 935 | { |
| 936 | time_t t; |
Paul Bakker | a3d195c | 2011-11-27 21:07:34 +0000 | [diff] [blame] | 937 | int ret, n; |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 938 | size_t ext_len = 0; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 939 | unsigned char *buf, *p; |
| 940 | |
| 941 | SSL_DEBUG_MSG( 2, ( "=> write server hello" ) ); |
| 942 | |
| 943 | /* |
| 944 | * 0 . 0 handshake type |
| 945 | * 1 . 3 handshake length |
| 946 | * 4 . 5 protocol version |
| 947 | * 6 . 9 UNIX time() |
| 948 | * 10 . 37 random bytes |
| 949 | */ |
| 950 | buf = ssl->out_msg; |
| 951 | p = buf + 4; |
| 952 | |
| 953 | *p++ = (unsigned char) ssl->major_ver; |
| 954 | *p++ = (unsigned char) ssl->minor_ver; |
| 955 | |
| 956 | SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]", |
| 957 | buf[4], buf[5] ) ); |
| 958 | |
| 959 | t = time( NULL ); |
| 960 | *p++ = (unsigned char)( t >> 24 ); |
| 961 | *p++ = (unsigned char)( t >> 16 ); |
| 962 | *p++ = (unsigned char)( t >> 8 ); |
| 963 | *p++ = (unsigned char)( t ); |
| 964 | |
| 965 | SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) ); |
| 966 | |
Paul Bakker | a3d195c | 2011-11-27 21:07:34 +0000 | [diff] [blame] | 967 | if( ( ret = ssl->f_rng( ssl->p_rng, p, 28 ) ) != 0 ) |
| 968 | return( ret ); |
| 969 | |
| 970 | p += 28; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 971 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 972 | memcpy( ssl->handshake->randbytes + 32, buf + 6, 32 ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 973 | |
| 974 | SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 ); |
| 975 | |
| 976 | /* |
| 977 | * 38 . 38 session id length |
| 978 | * 39 . 38+n session id |
Paul Bakker | e3166ce | 2011-01-27 17:40:50 +0000 | [diff] [blame] | 979 | * 39+n . 40+n chosen ciphersuite |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 980 | * 41+n . 41+n chosen compression alg. |
| 981 | */ |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 982 | ssl->session_negotiate->length = n = 32; |
| 983 | *p++ = (unsigned char) ssl->session_negotiate->length; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 984 | |
Paul Bakker | 0a59707 | 2012-09-25 21:55:46 +0000 | [diff] [blame] | 985 | if( ssl->renegotiation != SSL_INITIAL_HANDSHAKE || |
| 986 | ssl->f_get_cache == NULL || |
| 987 | ssl->f_get_cache( ssl->p_get_cache, ssl->session_negotiate ) != 0 ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 988 | { |
| 989 | /* |
| 990 | * Not found, create a new session id |
| 991 | */ |
Paul Bakker | 0a59707 | 2012-09-25 21:55:46 +0000 | [diff] [blame] | 992 | ssl->handshake->resume = 0; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 993 | ssl->state++; |
| 994 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 995 | if( ( ret = ssl->f_rng( ssl->p_rng, ssl->session_negotiate->id, |
| 996 | n ) ) != 0 ) |
Paul Bakker | a3d195c | 2011-11-27 21:07:34 +0000 | [diff] [blame] | 997 | return( ret ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 998 | } |
| 999 | else |
| 1000 | { |
| 1001 | /* |
Paul Bakker | 0a59707 | 2012-09-25 21:55:46 +0000 | [diff] [blame] | 1002 | * Found a matching session, resuming it |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1003 | */ |
Paul Bakker | 0a59707 | 2012-09-25 21:55:46 +0000 | [diff] [blame] | 1004 | ssl->handshake->resume = 1; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1005 | ssl->state = SSL_SERVER_CHANGE_CIPHER_SPEC; |
Paul Bakker | ff60ee6 | 2010-03-16 21:09:09 +0000 | [diff] [blame] | 1006 | |
| 1007 | if( ( ret = ssl_derive_keys( ssl ) ) != 0 ) |
| 1008 | { |
| 1009 | SSL_DEBUG_RET( 1, "ssl_derive_keys", ret ); |
| 1010 | return( ret ); |
| 1011 | } |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1012 | } |
| 1013 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1014 | memcpy( p, ssl->session_negotiate->id, ssl->session_negotiate->length ); |
| 1015 | p += ssl->session_negotiate->length; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1016 | |
| 1017 | SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) ); |
| 1018 | SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n ); |
| 1019 | SSL_DEBUG_MSG( 3, ( "%s session has been resumed", |
Paul Bakker | 0a59707 | 2012-09-25 21:55:46 +0000 | [diff] [blame] | 1020 | ssl->handshake->resume ? "a" : "no" ) ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1021 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1022 | *p++ = (unsigned char)( ssl->session_negotiate->ciphersuite >> 8 ); |
| 1023 | *p++ = (unsigned char)( ssl->session_negotiate->ciphersuite ); |
| 1024 | *p++ = (unsigned char)( ssl->session_negotiate->compression ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1025 | |
Paul Bakker | e3166ce | 2011-01-27 17:40:50 +0000 | [diff] [blame] | 1026 | SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %d", |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1027 | ssl->session_negotiate->ciphersuite ) ); |
Paul Bakker | 2770fbd | 2012-07-03 13:30:23 +0000 | [diff] [blame] | 1028 | SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1029 | ssl->session_negotiate->compression ) ); |
| 1030 | |
Paul Bakker | 2013950 | 2013-06-24 12:05:39 +0200 | [diff] [blame] | 1031 | if( ssl->secure_renegotiation == SSL_SECURE_RENEGOTIATION ) |
| 1032 | { |
| 1033 | SSL_DEBUG_MSG( 3, ( "server hello, prepping for secure renegotiation extension" ) ); |
| 1034 | ext_len += 5 + ssl->verify_data_len * 2; |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1035 | |
Paul Bakker | 2013950 | 2013-06-24 12:05:39 +0200 | [diff] [blame] | 1036 | SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %d", |
| 1037 | ext_len ) ); |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1038 | |
Paul Bakker | 2013950 | 2013-06-24 12:05:39 +0200 | [diff] [blame] | 1039 | *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF ); |
| 1040 | *p++ = (unsigned char)( ( ext_len ) & 0xFF ); |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1041 | |
Paul Bakker | 2013950 | 2013-06-24 12:05:39 +0200 | [diff] [blame] | 1042 | /* |
| 1043 | * Secure renegotiation |
| 1044 | */ |
| 1045 | SSL_DEBUG_MSG( 3, ( "client hello, secure renegotiation extension" ) ); |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1046 | |
Paul Bakker | 2013950 | 2013-06-24 12:05:39 +0200 | [diff] [blame] | 1047 | *p++ = (unsigned char)( ( TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF ); |
| 1048 | *p++ = (unsigned char)( ( TLS_EXT_RENEGOTIATION_INFO ) & 0xFF ); |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1049 | |
Paul Bakker | 2013950 | 2013-06-24 12:05:39 +0200 | [diff] [blame] | 1050 | *p++ = 0x00; |
| 1051 | *p++ = ( ssl->verify_data_len * 2 + 1 ) & 0xFF; |
| 1052 | *p++ = ssl->verify_data_len * 2 & 0xFF; |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1053 | |
Paul Bakker | 2013950 | 2013-06-24 12:05:39 +0200 | [diff] [blame] | 1054 | memcpy( p, ssl->peer_verify_data, ssl->verify_data_len ); |
| 1055 | p += ssl->verify_data_len; |
| 1056 | memcpy( p, ssl->own_verify_data, ssl->verify_data_len ); |
| 1057 | p += ssl->verify_data_len; |
| 1058 | } |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1059 | |
| 1060 | ssl->out_msglen = p - buf; |
| 1061 | ssl->out_msgtype = SSL_MSG_HANDSHAKE; |
| 1062 | ssl->out_msg[0] = SSL_HS_SERVER_HELLO; |
| 1063 | |
| 1064 | ret = ssl_write_record( ssl ); |
| 1065 | |
| 1066 | SSL_DEBUG_MSG( 2, ( "<= write server hello" ) ); |
| 1067 | |
| 1068 | return( ret ); |
| 1069 | } |
| 1070 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1071 | #if !defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED) && \ |
| 1072 | !defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) && \ |
| 1073 | !defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1074 | static int ssl_write_certificate_request( ssl_context *ssl ) |
| 1075 | { |
Paul Bakker | ed27a04 | 2013-04-18 22:46:23 +0200 | [diff] [blame] | 1076 | int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; |
| 1077 | const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1078 | |
| 1079 | SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); |
| 1080 | |
| 1081 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK || |
| 1082 | ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ) |
| 1083 | { |
| 1084 | SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); |
| 1085 | ssl->state++; |
| 1086 | return( 0 ); |
| 1087 | } |
| 1088 | |
| 1089 | return( ret ); |
| 1090 | } |
| 1091 | #else |
| 1092 | static int ssl_write_certificate_request( ssl_context *ssl ) |
| 1093 | { |
| 1094 | int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; |
| 1095 | const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1096 | size_t n = 0, dn_size, total_dn_size; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1097 | unsigned char *buf, *p; |
Paul Bakker | ff60ee6 | 2010-03-16 21:09:09 +0000 | [diff] [blame] | 1098 | const x509_cert *crt; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1099 | |
| 1100 | SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) ); |
| 1101 | |
| 1102 | ssl->state++; |
| 1103 | |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1104 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK || |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1105 | ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK || |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1106 | ssl->authmode == SSL_VERIFY_NONE ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1107 | { |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1108 | SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1109 | return( 0 ); |
| 1110 | } |
| 1111 | |
| 1112 | /* |
| 1113 | * 0 . 0 handshake type |
| 1114 | * 1 . 3 handshake length |
| 1115 | * 4 . 4 cert type count |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1116 | * 5 .. m-1 cert types |
| 1117 | * m .. m+1 sig alg length (TLS 1.2 only) |
| 1118 | * m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1119 | * n .. n+1 length of all DNs |
| 1120 | * n+2 .. n+3 length of DN 1 |
| 1121 | * n+4 .. ... Distinguished Name #1 |
| 1122 | * ... .. ... length of DN 2, etc. |
| 1123 | */ |
| 1124 | buf = ssl->out_msg; |
| 1125 | p = buf + 4; |
| 1126 | |
| 1127 | /* |
| 1128 | * At the moment, only RSA certificates are supported |
| 1129 | */ |
| 1130 | *p++ = 1; |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1131 | *p++ = SSL_CERT_TYPE_RSA_SIGN; |
| 1132 | |
| 1133 | /* |
| 1134 | * Add signature_algorithms for verify (TLS 1.2) |
| 1135 | * Only add current running algorithm that is already required for |
| 1136 | * requested ciphersuite. |
| 1137 | * |
| 1138 | * Length is always 2 |
| 1139 | */ |
Paul Bakker | 21dca69 | 2013-01-03 11:41:08 +0100 | [diff] [blame] | 1140 | if( ssl->minor_ver == SSL_MINOR_VERSION_3 ) |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1141 | { |
| 1142 | ssl->handshake->verify_sig_alg = SSL_HASH_SHA256; |
| 1143 | |
| 1144 | *p++ = 0; |
| 1145 | *p++ = 2; |
| 1146 | |
Paul Bakker | b7149bc | 2013-03-20 15:30:09 +0100 | [diff] [blame] | 1147 | if( ssl->transform_negotiate->ciphersuite_info->mac == |
| 1148 | POLARSSL_MD_SHA384 ) |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1149 | { |
| 1150 | ssl->handshake->verify_sig_alg = SSL_HASH_SHA384; |
| 1151 | } |
Paul Bakker | f7abd42 | 2013-04-16 13:15:56 +0200 | [diff] [blame] | 1152 | |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1153 | *p++ = ssl->handshake->verify_sig_alg; |
| 1154 | *p++ = SSL_SIG_RSA; |
| 1155 | |
| 1156 | n += 4; |
| 1157 | } |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1158 | |
| 1159 | p += 2; |
| 1160 | crt = ssl->ca_chain; |
| 1161 | |
Paul Bakker | bc3d984 | 2012-11-26 16:12:02 +0100 | [diff] [blame] | 1162 | total_dn_size = 0; |
Paul Bakker | 2908713 | 2010-03-21 21:03:34 +0000 | [diff] [blame] | 1163 | while( crt != NULL ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1164 | { |
| 1165 | if( p - buf > 4096 ) |
| 1166 | break; |
| 1167 | |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1168 | dn_size = crt->subject_raw.len; |
| 1169 | *p++ = (unsigned char)( dn_size >> 8 ); |
| 1170 | *p++ = (unsigned char)( dn_size ); |
| 1171 | memcpy( p, crt->subject_raw.p, dn_size ); |
| 1172 | p += dn_size; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1173 | |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1174 | SSL_DEBUG_BUF( 3, "requested DN", p, dn_size ); |
| 1175 | |
Paul Bakker | bc3d984 | 2012-11-26 16:12:02 +0100 | [diff] [blame] | 1176 | total_dn_size += 2 + dn_size; |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1177 | crt = crt->next; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1178 | } |
| 1179 | |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1180 | ssl->out_msglen = p - buf; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1181 | ssl->out_msgtype = SSL_MSG_HANDSHAKE; |
| 1182 | ssl->out_msg[0] = SSL_HS_CERTIFICATE_REQUEST; |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1183 | ssl->out_msg[6 + n] = (unsigned char)( total_dn_size >> 8 ); |
| 1184 | ssl->out_msg[7 + n] = (unsigned char)( total_dn_size ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1185 | |
| 1186 | ret = ssl_write_record( ssl ); |
| 1187 | |
| 1188 | SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) ); |
| 1189 | |
| 1190 | return( ret ); |
| 1191 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1192 | #endif /* !POLARSSL_KEY_EXCHANGE_RSA_ENABLED && |
| 1193 | !POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED && |
| 1194 | !POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */ |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1195 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1196 | static int ssl_write_server_key_exchange( ssl_context *ssl ) |
| 1197 | { |
Paul Bakker | 23986e5 | 2011-04-24 08:57:21 +0000 | [diff] [blame] | 1198 | int ret; |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1199 | size_t n = 0, len; |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 1200 | unsigned char hash[64]; |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1201 | md_type_t md_alg = POLARSSL_MD_NONE; |
Paul Bakker | 35a7fe5 | 2012-10-31 09:07:14 +0000 | [diff] [blame] | 1202 | unsigned int hashlen = 0; |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1203 | unsigned char *p = ssl->out_msg + 4; |
| 1204 | unsigned char *dig_sig = p; |
| 1205 | size_t dig_sig_len = 0; |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1206 | |
| 1207 | const ssl_ciphersuite_t *ciphersuite_info; |
| 1208 | ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1209 | |
| 1210 | SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) ); |
| 1211 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1212 | if( ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_RSA && |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1213 | ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_ECDHE_RSA && |
| 1214 | ciphersuite_info->key_exchange != POLARSSL_KEY_EXCHANGE_DHE_PSK ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1215 | { |
| 1216 | SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) ); |
| 1217 | ssl->state++; |
| 1218 | return( 0 ); |
| 1219 | } |
| 1220 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1221 | #if defined(POLARSSL_RSA_C) |
Paul Bakker | 43b7e35 | 2011-01-18 15:27:19 +0000 | [diff] [blame] | 1222 | if( ssl->rsa_key == NULL ) |
| 1223 | { |
Paul Bakker | eb2c658 | 2012-09-27 19:15:01 +0000 | [diff] [blame] | 1224 | SSL_DEBUG_MSG( 1, ( "got no private key" ) ); |
| 1225 | return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED ); |
Paul Bakker | 43b7e35 | 2011-01-18 15:27:19 +0000 | [diff] [blame] | 1226 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1227 | #endif /* POLARSSL_RSA_C */ |
Paul Bakker | 43b7e35 | 2011-01-18 15:27:19 +0000 | [diff] [blame] | 1228 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1229 | #if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) |
| 1230 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ) |
| 1231 | { |
| 1232 | /* TODO: Support identity hints */ |
| 1233 | *(p++) = 0x00; |
| 1234 | *(p++) = 0x00; |
| 1235 | |
| 1236 | n += 2; |
| 1237 | } |
| 1238 | #endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */ |
| 1239 | |
| 1240 | #if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ |
| 1241 | defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) |
| 1242 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_RSA || |
| 1243 | ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ) |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1244 | { |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1245 | /* |
| 1246 | * Ephemeral DH parameters: |
| 1247 | * |
| 1248 | * struct { |
| 1249 | * opaque dh_p<1..2^16-1>; |
| 1250 | * opaque dh_g<1..2^16-1>; |
| 1251 | * opaque dh_Ys<1..2^16-1>; |
| 1252 | * } ServerDHParams; |
| 1253 | */ |
| 1254 | if( ( ret = mpi_copy( &ssl->handshake->dhm_ctx.P, &ssl->dhm_P ) ) != 0 || |
| 1255 | ( ret = mpi_copy( &ssl->handshake->dhm_ctx.G, &ssl->dhm_G ) ) != 0 ) |
| 1256 | { |
| 1257 | SSL_DEBUG_RET( 1, "mpi_copy", ret ); |
| 1258 | return( ret ); |
| 1259 | } |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1260 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1261 | if( ( ret = dhm_make_params( &ssl->handshake->dhm_ctx, |
| 1262 | mpi_size( &ssl->handshake->dhm_ctx.P ), |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1263 | p, |
| 1264 | &len, ssl->f_rng, ssl->p_rng ) ) != 0 ) |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1265 | { |
| 1266 | SSL_DEBUG_RET( 1, "dhm_make_params", ret ); |
| 1267 | return( ret ); |
| 1268 | } |
| 1269 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1270 | dig_sig = p; |
| 1271 | dig_sig_len = len; |
| 1272 | |
| 1273 | p += len; |
| 1274 | n += len; |
| 1275 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1276 | SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X ); |
| 1277 | SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P ); |
| 1278 | SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G ); |
| 1279 | SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX ); |
| 1280 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1281 | #endif /* POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED || |
| 1282 | POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */ |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1283 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1284 | #if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1285 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1286 | { |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1287 | /* |
| 1288 | * Ephemeral ECDH parameters: |
| 1289 | * |
| 1290 | * struct { |
| 1291 | * ECParameters curve_params; |
| 1292 | * ECPoint public; |
| 1293 | * } ServerECDHParams; |
| 1294 | */ |
| 1295 | ecdh_init( &ssl->handshake->ecdh_ctx ); |
| 1296 | if( ( ret = ecp_use_known_dp( &ssl->handshake->ecdh_ctx.grp, |
| 1297 | ssl->handshake->ec_curve ) ) != 0 ) |
| 1298 | { |
| 1299 | SSL_DEBUG_RET( 1, "ecp_use_known_dp", ret ); |
| 1300 | return( ret ); |
| 1301 | } |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1302 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1303 | if( ( ret = ecdh_make_params( &ssl->handshake->ecdh_ctx, |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1304 | &len, |
| 1305 | p, |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1306 | 1000, ssl->f_rng, ssl->p_rng ) ) != 0 ) |
| 1307 | { |
| 1308 | SSL_DEBUG_RET( 1, "ecdh_make_params", ret ); |
| 1309 | return( ret ); |
| 1310 | } |
| 1311 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1312 | dig_sig = p; |
| 1313 | dig_sig_len = len; |
| 1314 | |
| 1315 | p += len; |
| 1316 | n += len; |
| 1317 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1318 | SSL_DEBUG_ECP( 3, "ECDH: Q ", &ssl->handshake->ecdh_ctx.Q ); |
| 1319 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1320 | #endif /* POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */ |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1321 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1322 | #if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ |
| 1323 | defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) |
| 1324 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_RSA || |
| 1325 | ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA ) |
Paul Bakker | 1ef83d6 | 2012-04-11 12:09:53 +0000 | [diff] [blame] | 1326 | { |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1327 | size_t rsa_key_len = 0; |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 1328 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1329 | if( ssl->minor_ver != SSL_MINOR_VERSION_3 ) |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 1330 | { |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1331 | md5_context md5; |
| 1332 | sha1_context sha1; |
| 1333 | |
| 1334 | /* |
| 1335 | * digitally-signed struct { |
| 1336 | * opaque md5_hash[16]; |
| 1337 | * opaque sha_hash[20]; |
| 1338 | * }; |
| 1339 | * |
| 1340 | * md5_hash |
| 1341 | * MD5(ClientHello.random + ServerHello.random |
| 1342 | * + ServerParams); |
| 1343 | * sha_hash |
| 1344 | * SHA(ClientHello.random + ServerHello.random |
| 1345 | * + ServerParams); |
| 1346 | */ |
| 1347 | md5_starts( &md5 ); |
| 1348 | md5_update( &md5, ssl->handshake->randbytes, 64 ); |
| 1349 | md5_update( &md5, dig_sig, dig_sig_len ); |
| 1350 | md5_finish( &md5, hash ); |
| 1351 | |
| 1352 | sha1_starts( &sha1 ); |
| 1353 | sha1_update( &sha1, ssl->handshake->randbytes, 64 ); |
| 1354 | sha1_update( &sha1, dig_sig, dig_sig_len ); |
| 1355 | sha1_finish( &sha1, hash + 16 ); |
| 1356 | |
| 1357 | hashlen = 36; |
| 1358 | md_alg = POLARSSL_MD_NONE; |
| 1359 | } |
| 1360 | else |
| 1361 | { |
| 1362 | md_context_t ctx; |
| 1363 | |
| 1364 | /* |
| 1365 | * digitally-signed struct { |
| 1366 | * opaque client_random[32]; |
| 1367 | * opaque server_random[32]; |
| 1368 | * ServerDHParams params; |
| 1369 | * }; |
| 1370 | */ |
| 1371 | switch( ssl->handshake->sig_alg ) |
| 1372 | { |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1373 | #if defined(POLARSSL_MD5_C) |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1374 | case SSL_HASH_MD5: |
| 1375 | md_alg = POLARSSL_MD_MD5; |
| 1376 | break; |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1377 | #endif |
| 1378 | #if defined(POLARSSL_SHA1_C) |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1379 | case SSL_HASH_SHA1: |
| 1380 | md_alg = POLARSSL_MD_SHA1; |
| 1381 | break; |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 1382 | #endif |
| 1383 | #if defined(POLARSSL_SHA2_C) |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1384 | case SSL_HASH_SHA224: |
| 1385 | md_alg = POLARSSL_MD_SHA224; |
| 1386 | break; |
| 1387 | case SSL_HASH_SHA256: |
| 1388 | md_alg = POLARSSL_MD_SHA256; |
| 1389 | break; |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 1390 | #endif |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1391 | #if defined(POLARSSL_SHA4_C) |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1392 | case SSL_HASH_SHA384: |
| 1393 | md_alg = POLARSSL_MD_SHA384; |
| 1394 | break; |
| 1395 | case SSL_HASH_SHA512: |
| 1396 | md_alg = POLARSSL_MD_SHA512; |
| 1397 | break; |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1398 | #endif |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1399 | default: |
| 1400 | /* Should never happen */ |
| 1401 | return( -1 ); |
| 1402 | } |
| 1403 | |
| 1404 | if( ( ret = md_init_ctx( &ctx, md_info_from_type( md_alg ) ) ) != 0 ) |
| 1405 | { |
| 1406 | SSL_DEBUG_RET( 1, "md_init_ctx", ret ); |
| 1407 | return( ret ); |
| 1408 | } |
| 1409 | |
| 1410 | md_starts( &ctx ); |
| 1411 | md_update( &ctx, ssl->handshake->randbytes, 64 ); |
| 1412 | md_update( &ctx, dig_sig, dig_sig_len ); |
| 1413 | md_finish( &ctx, hash ); |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 1414 | } |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1415 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1416 | SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen ); |
| 1417 | |
| 1418 | if ( ssl->rsa_key ) |
| 1419 | rsa_key_len = ssl->rsa_key_len( ssl->rsa_key ); |
| 1420 | |
| 1421 | if( ssl->minor_ver == SSL_MINOR_VERSION_3 ) |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 1422 | { |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1423 | *(p++) = ssl->handshake->sig_alg; |
| 1424 | *(p++) = SSL_SIG_RSA; |
| 1425 | |
| 1426 | n += 2; |
| 1427 | } |
| 1428 | |
| 1429 | *(p++) = (unsigned char)( rsa_key_len >> 8 ); |
| 1430 | *(p++) = (unsigned char)( rsa_key_len ); |
| 1431 | n += 2; |
| 1432 | |
| 1433 | if ( ssl->rsa_key ) |
| 1434 | { |
| 1435 | ret = ssl->rsa_sign( ssl->rsa_key, ssl->f_rng, ssl->p_rng, |
| 1436 | RSA_PRIVATE, md_alg, hashlen, hash, p ); |
| 1437 | } |
| 1438 | |
| 1439 | if( ret != 0 ) |
| 1440 | { |
| 1441 | SSL_DEBUG_RET( 1, "pkcs1_sign", ret ); |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1442 | return( ret ); |
Paul Bakker | 23f3680 | 2012-09-28 14:15:14 +0000 | [diff] [blame] | 1443 | } |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1444 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1445 | SSL_DEBUG_BUF( 3, "my RSA sig", p, rsa_key_len ); |
| 1446 | |
| 1447 | p += rsa_key_len; |
| 1448 | n += rsa_key_len; |
Paul Bakker | 1ef83d6 | 2012-04-11 12:09:53 +0000 | [diff] [blame] | 1449 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1450 | #endif /* POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || |
| 1451 | POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */ |
Paul Bakker | 1ef83d6 | 2012-04-11 12:09:53 +0000 | [diff] [blame] | 1452 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1453 | ssl->out_msglen = 4 + n; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1454 | ssl->out_msgtype = SSL_MSG_HANDSHAKE; |
| 1455 | ssl->out_msg[0] = SSL_HS_SERVER_KEY_EXCHANGE; |
| 1456 | |
| 1457 | ssl->state++; |
| 1458 | |
| 1459 | if( ( ret = ssl_write_record( ssl ) ) != 0 ) |
| 1460 | { |
| 1461 | SSL_DEBUG_RET( 1, "ssl_write_record", ret ); |
| 1462 | return( ret ); |
| 1463 | } |
| 1464 | |
| 1465 | SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) ); |
| 1466 | |
| 1467 | return( 0 ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1468 | } |
| 1469 | |
| 1470 | static int ssl_write_server_hello_done( ssl_context *ssl ) |
| 1471 | { |
| 1472 | int ret; |
| 1473 | |
| 1474 | SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) ); |
| 1475 | |
| 1476 | ssl->out_msglen = 4; |
| 1477 | ssl->out_msgtype = SSL_MSG_HANDSHAKE; |
| 1478 | ssl->out_msg[0] = SSL_HS_SERVER_HELLO_DONE; |
| 1479 | |
| 1480 | ssl->state++; |
| 1481 | |
| 1482 | if( ( ret = ssl_write_record( ssl ) ) != 0 ) |
| 1483 | { |
| 1484 | SSL_DEBUG_RET( 1, "ssl_write_record", ret ); |
| 1485 | return( ret ); |
| 1486 | } |
| 1487 | |
| 1488 | SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) ); |
| 1489 | |
| 1490 | return( 0 ); |
| 1491 | } |
| 1492 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1493 | #if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) || \ |
| 1494 | defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) |
| 1495 | static int ssl_parse_client_dh_public( ssl_context *ssl, unsigned char **p, |
| 1496 | const unsigned char *end ) |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1497 | { |
| 1498 | int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1499 | size_t n; |
| 1500 | |
| 1501 | /* |
| 1502 | * Receive G^Y mod P, premaster = (G^Y)^X mod P |
| 1503 | */ |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1504 | if( *p + 2 > end ) |
| 1505 | { |
| 1506 | SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); |
| 1507 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); |
| 1508 | } |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1509 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1510 | n = ( (*p)[0] << 8 ) | (*p)[1]; |
| 1511 | *p += 2; |
| 1512 | |
| 1513 | if( n < 1 || n > ssl->handshake->dhm_ctx.len || *p + n > end ) |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1514 | { |
| 1515 | SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); |
| 1516 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); |
| 1517 | } |
| 1518 | |
| 1519 | if( ( ret = dhm_read_public( &ssl->handshake->dhm_ctx, |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1520 | *p, n ) ) != 0 ) |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1521 | { |
| 1522 | SSL_DEBUG_RET( 1, "dhm_read_public", ret ); |
| 1523 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); |
| 1524 | } |
| 1525 | |
| 1526 | SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY ); |
| 1527 | |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1528 | return( ret ); |
| 1529 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1530 | #endif /* POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED || |
| 1531 | POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */ |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1532 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1533 | #if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1534 | static int ssl_parse_client_ecdh_public( ssl_context *ssl ) |
| 1535 | { |
| 1536 | int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1537 | size_t n; |
| 1538 | |
| 1539 | /* |
| 1540 | * Receive client public key and calculate premaster |
| 1541 | */ |
| 1542 | n = ssl->in_msg[3]; |
| 1543 | |
| 1544 | if( n < 1 || n > mpi_size( &ssl->handshake->ecdh_ctx.grp.P ) * 2 + 2 || |
| 1545 | n + 4 != ssl->in_hslen ) |
| 1546 | { |
| 1547 | SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); |
| 1548 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); |
| 1549 | } |
| 1550 | |
| 1551 | if( ( ret = ecdh_read_public( &ssl->handshake->ecdh_ctx, |
| 1552 | ssl->in_msg + 4, n ) ) != 0 ) |
| 1553 | { |
| 1554 | SSL_DEBUG_RET( 1, "ecdh_read_public", ret ); |
| 1555 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP ); |
| 1556 | } |
| 1557 | |
| 1558 | SSL_DEBUG_ECP( 3, "ECDH: Qp ", &ssl->handshake->ecdh_ctx.Qp ); |
| 1559 | |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1560 | return( ret ); |
| 1561 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1562 | #endif /* POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */ |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1563 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1564 | #if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED) |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1565 | static int ssl_parse_encrypted_pms_secret( ssl_context *ssl ) |
| 1566 | { |
| 1567 | int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; |
| 1568 | size_t i, n = 0; |
| 1569 | |
| 1570 | if( ssl->rsa_key == NULL ) |
| 1571 | { |
| 1572 | SSL_DEBUG_MSG( 1, ( "got no private key" ) ); |
| 1573 | return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED ); |
| 1574 | } |
| 1575 | |
| 1576 | /* |
| 1577 | * Decrypt the premaster using own private RSA key |
| 1578 | */ |
| 1579 | i = 4; |
| 1580 | if( ssl->rsa_key ) |
| 1581 | n = ssl->rsa_key_len( ssl->rsa_key ); |
| 1582 | ssl->handshake->pmslen = 48; |
| 1583 | |
| 1584 | if( ssl->minor_ver != SSL_MINOR_VERSION_0 ) |
| 1585 | { |
| 1586 | i += 2; |
| 1587 | if( ssl->in_msg[4] != ( ( n >> 8 ) & 0xFF ) || |
| 1588 | ssl->in_msg[5] != ( ( n ) & 0xFF ) ) |
| 1589 | { |
| 1590 | SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); |
| 1591 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); |
| 1592 | } |
| 1593 | } |
| 1594 | |
| 1595 | if( ssl->in_hslen != i + n ) |
| 1596 | { |
| 1597 | SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); |
| 1598 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); |
| 1599 | } |
| 1600 | |
| 1601 | if( ssl->rsa_key ) { |
| 1602 | ret = ssl->rsa_decrypt( ssl->rsa_key, RSA_PRIVATE, |
| 1603 | &ssl->handshake->pmslen, |
| 1604 | ssl->in_msg + i, |
| 1605 | ssl->handshake->premaster, |
| 1606 | sizeof(ssl->handshake->premaster) ); |
| 1607 | } |
| 1608 | |
| 1609 | if( ret != 0 || ssl->handshake->pmslen != 48 || |
Paul Bakker | 2fbefde | 2013-06-29 16:01:15 +0200 | [diff] [blame] | 1610 | ssl->handshake->premaster[0] != ssl->handshake->max_major_ver || |
| 1611 | ssl->handshake->premaster[1] != ssl->handshake->max_minor_ver ) |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1612 | { |
| 1613 | SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); |
| 1614 | |
| 1615 | /* |
| 1616 | * Protection against Bleichenbacher's attack: |
| 1617 | * invalid PKCS#1 v1.5 padding must not cause |
| 1618 | * the connection to end immediately; instead, |
| 1619 | * send a bad_record_mac later in the handshake. |
| 1620 | */ |
| 1621 | ssl->handshake->pmslen = 48; |
| 1622 | |
| 1623 | ret = ssl->f_rng( ssl->p_rng, ssl->handshake->premaster, |
| 1624 | ssl->handshake->pmslen ); |
| 1625 | if( ret != 0 ) |
| 1626 | return( ret ); |
| 1627 | } |
| 1628 | |
| 1629 | return( ret ); |
| 1630 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1631 | #endif /* POLARSSL_KEY_EXCHANGE_RSA_ENABLED */ |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1632 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1633 | #if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED) || \ |
| 1634 | defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) |
| 1635 | static int ssl_parse_client_psk_identity( ssl_context *ssl, unsigned char **p, |
| 1636 | const unsigned char *end ) |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1637 | { |
| 1638 | int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1639 | size_t n; |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1640 | |
| 1641 | if( ssl->psk == NULL || ssl->psk_identity == NULL || |
| 1642 | ssl->psk_identity_len == 0 || ssl->psk_len == 0 ) |
| 1643 | { |
| 1644 | SSL_DEBUG_MSG( 1, ( "got no pre-shared key" ) ); |
| 1645 | return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED ); |
| 1646 | } |
| 1647 | |
| 1648 | /* |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1649 | * Receive client pre-shared key identity name |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1650 | */ |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1651 | if( *p + 2 > end ) |
| 1652 | { |
| 1653 | SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); |
| 1654 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); |
| 1655 | } |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1656 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1657 | n = ( (*p)[0] << 8 ) | (*p)[1]; |
| 1658 | *p += 2; |
| 1659 | |
| 1660 | if( n < 1 || n > 65535 || *p + n > end ) |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1661 | { |
| 1662 | SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); |
| 1663 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); |
| 1664 | } |
| 1665 | |
| 1666 | if( n != ssl->psk_identity_len || |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1667 | memcmp( ssl->psk_identity, *p, n ) != 0 ) |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1668 | { |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1669 | SSL_DEBUG_BUF( 3, "Unknown PSK identity", *p, n ); |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1670 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); |
| 1671 | } |
| 1672 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1673 | *p += n; |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1674 | ret = 0; |
| 1675 | |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1676 | return( ret ); |
| 1677 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1678 | #endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED || |
| 1679 | POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */ |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1680 | |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1681 | static int ssl_parse_client_key_exchange( ssl_context *ssl ) |
| 1682 | { |
Paul Bakker | 23986e5 | 2011-04-24 08:57:21 +0000 | [diff] [blame] | 1683 | int ret; |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1684 | const ssl_ciphersuite_t *ciphersuite_info; |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1685 | unsigned char *p, *end; |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1686 | |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1687 | ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1688 | |
| 1689 | SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) ); |
| 1690 | |
| 1691 | if( ( ret = ssl_read_record( ssl ) ) != 0 ) |
| 1692 | { |
| 1693 | SSL_DEBUG_RET( 1, "ssl_read_record", ret ); |
| 1694 | return( ret ); |
| 1695 | } |
| 1696 | |
| 1697 | if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) |
| 1698 | { |
| 1699 | SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); |
Paul Bakker | 40e4694 | 2009-01-03 21:51:57 +0000 | [diff] [blame] | 1700 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1701 | } |
| 1702 | |
| 1703 | if( ssl->in_msg[0] != SSL_HS_CLIENT_KEY_EXCHANGE ) |
| 1704 | { |
| 1705 | SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) ); |
Paul Bakker | 40e4694 | 2009-01-03 21:51:57 +0000 | [diff] [blame] | 1706 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1707 | } |
| 1708 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1709 | p = ssl->in_msg + 4; |
| 1710 | end = ssl->in_msg + ssl->in_msglen; |
| 1711 | |
| 1712 | #if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1713 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_RSA ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1714 | { |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1715 | if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1716 | { |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1717 | SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret ); |
| 1718 | return( ret ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1719 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1720 | |
| 1721 | ssl->handshake->pmslen = ssl->handshake->dhm_ctx.len; |
| 1722 | |
| 1723 | if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx, |
| 1724 | ssl->handshake->premaster, |
| 1725 | &ssl->handshake->pmslen ) ) != 0 ) |
| 1726 | { |
| 1727 | SSL_DEBUG_RET( 1, "dhm_calc_secret", ret ); |
| 1728 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); |
| 1729 | } |
| 1730 | |
| 1731 | SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1732 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1733 | else |
| 1734 | #endif /* POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED */ |
| 1735 | #if defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) |
| 1736 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_RSA ) |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1737 | { |
| 1738 | if( ( ret = ssl_parse_client_ecdh_public( ssl ) ) != 0 ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1739 | { |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1740 | SSL_DEBUG_RET( 1, ( "ssl_parse_client_ecdh_public" ), ret ); |
| 1741 | return( ret ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1742 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1743 | |
| 1744 | if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx, |
| 1745 | &ssl->handshake->pmslen, |
| 1746 | ssl->handshake->premaster, |
| 1747 | POLARSSL_MPI_MAX_SIZE ) ) != 0 ) |
| 1748 | { |
| 1749 | SSL_DEBUG_RET( 1, "ecdh_calc_secret", ret ); |
| 1750 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); |
| 1751 | } |
| 1752 | |
| 1753 | SSL_DEBUG_MPI( 3, "ECDH: z ", &ssl->handshake->ecdh_ctx.z ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1754 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1755 | else |
| 1756 | #endif /* POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */ |
| 1757 | #if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED) |
| 1758 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK ) |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1759 | { |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1760 | if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1761 | { |
| 1762 | SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); |
| 1763 | return( ret ); |
| 1764 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1765 | |
| 1766 | // Set up the premaster secret |
| 1767 | // |
| 1768 | p = ssl->handshake->premaster; |
| 1769 | *(p++) = (unsigned char)( ssl->psk_len >> 8 ); |
| 1770 | *(p++) = (unsigned char)( ssl->psk_len ); |
| 1771 | p += ssl->psk_len; |
| 1772 | |
| 1773 | *(p++) = (unsigned char)( ssl->psk_len >> 8 ); |
| 1774 | *(p++) = (unsigned char)( ssl->psk_len ); |
| 1775 | memcpy( p, ssl->psk, ssl->psk_len ); |
| 1776 | p += ssl->psk_len; |
| 1777 | |
| 1778 | ssl->handshake->pmslen = 4 + 2 * ssl->psk_len; |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1779 | } |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1780 | else |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1781 | #endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */ |
| 1782 | #if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) |
| 1783 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ) |
| 1784 | { |
| 1785 | size_t n; |
| 1786 | |
| 1787 | if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 ) |
| 1788 | { |
| 1789 | SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret ); |
| 1790 | return( ret ); |
| 1791 | } |
| 1792 | if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 ) |
| 1793 | { |
| 1794 | SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret ); |
| 1795 | return( ret ); |
| 1796 | } |
| 1797 | |
| 1798 | // Set up the premaster secret |
| 1799 | // |
| 1800 | p = ssl->handshake->premaster; |
| 1801 | *(p++) = (unsigned char)( ssl->handshake->dhm_ctx.len >> 8 ); |
| 1802 | *(p++) = (unsigned char)( ssl->handshake->dhm_ctx.len ); |
| 1803 | |
| 1804 | if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx, |
| 1805 | p, &n ) ) != 0 ) |
| 1806 | { |
| 1807 | SSL_DEBUG_RET( 1, "dhm_calc_secret", ret ); |
| 1808 | return( POLARSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS ); |
| 1809 | } |
| 1810 | |
| 1811 | if( n != ssl->handshake->dhm_ctx.len ) |
| 1812 | { |
| 1813 | SSL_DEBUG_MSG( 1, ( "dhm_calc_secret result smaller than DHM" ) ); |
| 1814 | return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); |
| 1815 | } |
| 1816 | |
| 1817 | SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); |
| 1818 | |
| 1819 | p += ssl->handshake->dhm_ctx.len; |
| 1820 | |
| 1821 | *(p++) = (unsigned char)( ssl->psk_len >> 8 ); |
| 1822 | *(p++) = (unsigned char)( ssl->psk_len ); |
| 1823 | memcpy( p, ssl->psk, ssl->psk_len ); |
| 1824 | p += ssl->psk_len; |
| 1825 | |
| 1826 | ssl->handshake->pmslen = 4 + ssl->handshake->dhm_ctx.len + ssl->psk_len; |
| 1827 | } |
| 1828 | else |
| 1829 | #endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */ |
| 1830 | #if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED) |
| 1831 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_RSA ) |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1832 | { |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1833 | if( ( ret = ssl_parse_encrypted_pms_secret( ssl ) ) != 0 ) |
Paul Bakker | 41c83d3 | 2013-03-20 14:39:14 +0100 | [diff] [blame] | 1834 | { |
Paul Bakker | 70df2fb | 2013-04-17 17:19:09 +0200 | [diff] [blame] | 1835 | SSL_DEBUG_RET( 1, ( "ssl_parse_client_ecdh_public" ), ret ); |
| 1836 | return( ret ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1837 | } |
| 1838 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1839 | else |
| 1840 | #endif /* POLARSSL_KEY_EXCHANGE_RSA_ENABLED */ |
| 1841 | { |
| 1842 | return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); |
| 1843 | } |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1844 | |
Paul Bakker | ff60ee6 | 2010-03-16 21:09:09 +0000 | [diff] [blame] | 1845 | if( ( ret = ssl_derive_keys( ssl ) ) != 0 ) |
| 1846 | { |
| 1847 | SSL_DEBUG_RET( 1, "ssl_derive_keys", ret ); |
| 1848 | return( ret ); |
| 1849 | } |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1850 | |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1851 | ssl->state++; |
| 1852 | |
| 1853 | SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) ); |
| 1854 | |
| 1855 | return( 0 ); |
| 1856 | } |
| 1857 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1858 | #if !defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED) && \ |
| 1859 | !defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) && \ |
| 1860 | !defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1861 | static int ssl_parse_certificate_verify( ssl_context *ssl ) |
| 1862 | { |
Paul Bakker | ed27a04 | 2013-04-18 22:46:23 +0200 | [diff] [blame] | 1863 | int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; |
Paul Bakker | fbb1780 | 2013-04-17 19:10:21 +0200 | [diff] [blame] | 1864 | const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1865 | |
| 1866 | SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) ); |
| 1867 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1868 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK || |
| 1869 | ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ) |
Paul Bakker | ed27a04 | 2013-04-18 22:46:23 +0200 | [diff] [blame] | 1870 | { |
| 1871 | SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); |
| 1872 | ssl->state++; |
| 1873 | return( 0 ); |
| 1874 | } |
| 1875 | |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1876 | return( ret ); |
| 1877 | } |
| 1878 | #else |
| 1879 | static int ssl_parse_certificate_verify( ssl_context *ssl ) |
| 1880 | { |
| 1881 | int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; |
| 1882 | size_t n = 0, n1, n2; |
| 1883 | unsigned char hash[48]; |
| 1884 | md_type_t md_alg = POLARSSL_MD_NONE; |
| 1885 | unsigned int hashlen = 0; |
| 1886 | const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; |
| 1887 | |
| 1888 | SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) ); |
| 1889 | |
| 1890 | if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK || |
| 1891 | ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK ) |
| 1892 | { |
| 1893 | SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); |
| 1894 | ssl->state++; |
| 1895 | return( 0 ); |
| 1896 | } |
| 1897 | |
Paul Bakker | ed27a04 | 2013-04-18 22:46:23 +0200 | [diff] [blame] | 1898 | if( ssl->session_negotiate->peer_cert == NULL ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1899 | { |
| 1900 | SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) ); |
| 1901 | ssl->state++; |
| 1902 | return( 0 ); |
| 1903 | } |
| 1904 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1905 | ssl->handshake->calc_verify( ssl, hash ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1906 | |
| 1907 | if( ( ret = ssl_read_record( ssl ) ) != 0 ) |
| 1908 | { |
| 1909 | SSL_DEBUG_RET( 1, "ssl_read_record", ret ); |
| 1910 | return( ret ); |
| 1911 | } |
| 1912 | |
| 1913 | ssl->state++; |
| 1914 | |
| 1915 | if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) |
| 1916 | { |
| 1917 | SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); |
Paul Bakker | 40e4694 | 2009-01-03 21:51:57 +0000 | [diff] [blame] | 1918 | return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1919 | } |
| 1920 | |
| 1921 | if( ssl->in_msg[0] != SSL_HS_CERTIFICATE_VERIFY ) |
| 1922 | { |
| 1923 | SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); |
Paul Bakker | 40e4694 | 2009-01-03 21:51:57 +0000 | [diff] [blame] | 1924 | return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1925 | } |
| 1926 | |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1927 | if( ssl->minor_ver == SSL_MINOR_VERSION_3 ) |
| 1928 | { |
| 1929 | /* |
| 1930 | * As server we know we either have SSL_HASH_SHA384 or |
| 1931 | * SSL_HASH_SHA256 |
| 1932 | */ |
| 1933 | if( ssl->in_msg[4] != ssl->handshake->verify_sig_alg || |
| 1934 | ssl->in_msg[5] != SSL_SIG_RSA ) |
| 1935 | { |
| 1936 | SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg for verify message" ) ); |
| 1937 | return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); |
| 1938 | } |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1939 | |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1940 | if( ssl->handshake->verify_sig_alg == SSL_HASH_SHA384 ) |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1941 | md_alg = POLARSSL_MD_SHA384; |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1942 | else |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1943 | md_alg = POLARSSL_MD_SHA256; |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1944 | |
| 1945 | n += 2; |
| 1946 | } |
| 1947 | else |
| 1948 | { |
| 1949 | hashlen = 36; |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1950 | md_alg = POLARSSL_MD_NONE; |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1951 | } |
| 1952 | |
| 1953 | n1 = ssl->session_negotiate->peer_cert->rsa.len; |
Paul Bakker | 78ce507 | 2012-11-23 14:23:53 +0100 | [diff] [blame] | 1954 | n2 = ( ssl->in_msg[4 + n] << 8 ) | ssl->in_msg[5 + n]; |
Paul Bakker | 926af75 | 2012-11-23 13:38:07 +0100 | [diff] [blame] | 1955 | |
| 1956 | if( n + n1 + 6 != ssl->in_hslen || n1 != n2 ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1957 | { |
| 1958 | SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) ); |
Paul Bakker | 40e4694 | 2009-01-03 21:51:57 +0000 | [diff] [blame] | 1959 | return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1960 | } |
| 1961 | |
Paul Bakker | 48916f9 | 2012-09-16 19:57:18 +0000 | [diff] [blame] | 1962 | ret = rsa_pkcs1_verify( &ssl->session_negotiate->peer_cert->rsa, RSA_PUBLIC, |
Paul Bakker | c70b982 | 2013-04-07 22:00:46 +0200 | [diff] [blame] | 1963 | md_alg, hashlen, hash, ssl->in_msg + 6 + n ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1964 | if( ret != 0 ) |
| 1965 | { |
| 1966 | SSL_DEBUG_RET( 1, "rsa_pkcs1_verify", ret ); |
| 1967 | return( ret ); |
| 1968 | } |
| 1969 | |
| 1970 | SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) ); |
| 1971 | |
Paul Bakker | ed27a04 | 2013-04-18 22:46:23 +0200 | [diff] [blame] | 1972 | return( ret ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1973 | } |
Paul Bakker | 48f7a5d | 2013-04-19 14:30:58 +0200 | [diff] [blame] | 1974 | #endif /* !POLARSSL_KEY_EXCHANGE_RSA_ENABLED && |
| 1975 | !POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED && |
| 1976 | !POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED */ |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1977 | |
| 1978 | /* |
Paul Bakker | 1961b70 | 2013-01-25 14:49:24 +0100 | [diff] [blame] | 1979 | * SSL handshake -- server side -- single step |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1980 | */ |
Paul Bakker | 1961b70 | 2013-01-25 14:49:24 +0100 | [diff] [blame] | 1981 | int ssl_handshake_server_step( ssl_context *ssl ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1982 | { |
| 1983 | int ret = 0; |
| 1984 | |
Paul Bakker | 1961b70 | 2013-01-25 14:49:24 +0100 | [diff] [blame] | 1985 | if( ssl->state == SSL_HANDSHAKE_OVER ) |
| 1986 | return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1987 | |
Paul Bakker | 1961b70 | 2013-01-25 14:49:24 +0100 | [diff] [blame] | 1988 | SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) ); |
| 1989 | |
| 1990 | if( ( ret = ssl_flush_output( ssl ) ) != 0 ) |
| 1991 | return( ret ); |
| 1992 | |
| 1993 | switch( ssl->state ) |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1994 | { |
Paul Bakker | 1961b70 | 2013-01-25 14:49:24 +0100 | [diff] [blame] | 1995 | case SSL_HELLO_REQUEST: |
| 1996 | ssl->state = SSL_CLIENT_HELLO; |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 1997 | break; |
| 1998 | |
Paul Bakker | 1961b70 | 2013-01-25 14:49:24 +0100 | [diff] [blame] | 1999 | /* |
| 2000 | * <== ClientHello |
| 2001 | */ |
| 2002 | case SSL_CLIENT_HELLO: |
| 2003 | ret = ssl_parse_client_hello( ssl ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 2004 | break; |
Paul Bakker | 1961b70 | 2013-01-25 14:49:24 +0100 | [diff] [blame] | 2005 | |
| 2006 | /* |
| 2007 | * ==> ServerHello |
| 2008 | * Certificate |
| 2009 | * ( ServerKeyExchange ) |
| 2010 | * ( CertificateRequest ) |
| 2011 | * ServerHelloDone |
| 2012 | */ |
| 2013 | case SSL_SERVER_HELLO: |
| 2014 | ret = ssl_write_server_hello( ssl ); |
| 2015 | break; |
| 2016 | |
| 2017 | case SSL_SERVER_CERTIFICATE: |
| 2018 | ret = ssl_write_certificate( ssl ); |
| 2019 | break; |
| 2020 | |
| 2021 | case SSL_SERVER_KEY_EXCHANGE: |
| 2022 | ret = ssl_write_server_key_exchange( ssl ); |
| 2023 | break; |
| 2024 | |
| 2025 | case SSL_CERTIFICATE_REQUEST: |
| 2026 | ret = ssl_write_certificate_request( ssl ); |
| 2027 | break; |
| 2028 | |
| 2029 | case SSL_SERVER_HELLO_DONE: |
| 2030 | ret = ssl_write_server_hello_done( ssl ); |
| 2031 | break; |
| 2032 | |
| 2033 | /* |
| 2034 | * <== ( Certificate/Alert ) |
| 2035 | * ClientKeyExchange |
| 2036 | * ( CertificateVerify ) |
| 2037 | * ChangeCipherSpec |
| 2038 | * Finished |
| 2039 | */ |
| 2040 | case SSL_CLIENT_CERTIFICATE: |
| 2041 | ret = ssl_parse_certificate( ssl ); |
| 2042 | break; |
| 2043 | |
| 2044 | case SSL_CLIENT_KEY_EXCHANGE: |
| 2045 | ret = ssl_parse_client_key_exchange( ssl ); |
| 2046 | break; |
| 2047 | |
| 2048 | case SSL_CERTIFICATE_VERIFY: |
| 2049 | ret = ssl_parse_certificate_verify( ssl ); |
| 2050 | break; |
| 2051 | |
| 2052 | case SSL_CLIENT_CHANGE_CIPHER_SPEC: |
| 2053 | ret = ssl_parse_change_cipher_spec( ssl ); |
| 2054 | break; |
| 2055 | |
| 2056 | case SSL_CLIENT_FINISHED: |
| 2057 | ret = ssl_parse_finished( ssl ); |
| 2058 | break; |
| 2059 | |
| 2060 | /* |
| 2061 | * ==> ChangeCipherSpec |
| 2062 | * Finished |
| 2063 | */ |
| 2064 | case SSL_SERVER_CHANGE_CIPHER_SPEC: |
| 2065 | ret = ssl_write_change_cipher_spec( ssl ); |
| 2066 | break; |
| 2067 | |
| 2068 | case SSL_SERVER_FINISHED: |
| 2069 | ret = ssl_write_finished( ssl ); |
| 2070 | break; |
| 2071 | |
| 2072 | case SSL_FLUSH_BUFFERS: |
| 2073 | SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); |
| 2074 | ssl->state = SSL_HANDSHAKE_WRAPUP; |
| 2075 | break; |
| 2076 | |
| 2077 | case SSL_HANDSHAKE_WRAPUP: |
| 2078 | ssl_handshake_wrapup( ssl ); |
| 2079 | break; |
| 2080 | |
| 2081 | default: |
| 2082 | SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); |
| 2083 | return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 2084 | } |
| 2085 | |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 2086 | return( ret ); |
| 2087 | } |
Paul Bakker | 5121ce5 | 2009-01-03 21:22:43 +0000 | [diff] [blame] | 2088 | #endif |