Hannes Tschofenig
Example program to test AES-GCM functionality. Used for a workshop
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ssl_tls.c
00001 /* 00002 * SSLv3/TLSv1 shared functions 00003 * 00004 * Copyright (C) 2006-2014, Brainspark B.V. 00005 * 00006 * This file is part of PolarSSL (http://www.polarssl.org) 00007 * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org> 00008 * 00009 * All rights reserved. 00010 * 00011 * This program is free software; you can redistribute it and/or modify 00012 * it under the terms of the GNU General Public License as published by 00013 * the Free Software Foundation; either version 2 of the License, or 00014 * (at your option) any later version. 00015 * 00016 * This program is distributed in the hope that it will be useful, 00017 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00018 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00019 * GNU General Public License for more details. 00020 * 00021 * You should have received a copy of the GNU General Public License along 00022 * with this program; if not, write to the Free Software Foundation, Inc., 00023 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 00024 */ 00025 /* 00026 * The SSL 3.0 specification was drafted by Netscape in 1996, 00027 * and became an IETF standard in 1999. 00028 * 00029 * http://wp.netscape.com/eng/ssl3/ 00030 * http://www.ietf.org/rfc/rfc2246.txt 00031 * http://www.ietf.org/rfc/rfc4346.txt 00032 */ 00033 00034 #if !defined(POLARSSL_CONFIG_FILE) 00035 #include "polarssl/config.h" 00036 #else 00037 #include POLARSSL_CONFIG_FILE 00038 #endif 00039 00040 #if defined(POLARSSL_SSL_TLS_C) 00041 00042 #include "polarssl/debug.h" 00043 #include "polarssl/ssl.h" 00044 00045 #if defined(POLARSSL_X509_CRT_PARSE_C) && \ 00046 defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE) 00047 #include "polarssl/oid.h" 00048 #endif 00049 00050 #if defined(POLARSSL_PLATFORM_C) 00051 #include "polarssl/platform.h" 00052 #else 00053 #define polarssl_malloc malloc 00054 #define polarssl_free free 00055 #endif 00056 00057 #include <stdlib.h> 00058 00059 #if defined(_MSC_VER) && !defined strcasecmp && !defined(EFIX64) && \ 00060 !defined(EFI32) 00061 #define strcasecmp _stricmp 00062 #endif 00063 00064 #if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH) 00065 /* 00066 * Convert max_fragment_length codes to length. 00067 * RFC 6066 says: 00068 * enum{ 00069 * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255) 00070 * } MaxFragmentLength; 00071 * and we add 0 -> extension unused 00072 */ 00073 static unsigned int mfl_code_to_length[SSL_MAX_FRAG_LEN_INVALID] = 00074 { 00075 SSL_MAX_CONTENT_LEN, /* SSL_MAX_FRAG_LEN_NONE */ 00076 512, /* SSL_MAX_FRAG_LEN_512 */ 00077 1024, /* SSL_MAX_FRAG_LEN_1024 */ 00078 2048, /* SSL_MAX_FRAG_LEN_2048 */ 00079 4096, /* SSL_MAX_FRAG_LEN_4096 */ 00080 }; 00081 #endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */ 00082 00083 static int ssl_session_copy( ssl_session *dst, const ssl_session *src ) 00084 { 00085 ssl_session_free( dst ); 00086 memcpy( dst, src, sizeof( ssl_session ) ); 00087 00088 #if defined(POLARSSL_X509_CRT_PARSE_C) 00089 if( src->peer_cert != NULL ) 00090 { 00091 int ret; 00092 00093 dst->peer_cert = (x509_crt *) polarssl_malloc( sizeof(x509_crt) ); 00094 if( dst->peer_cert == NULL ) 00095 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 00096 00097 x509_crt_init( dst->peer_cert ); 00098 00099 if( ( ret = x509_crt_parse( dst->peer_cert, src->peer_cert->raw.p, 00100 src->peer_cert->raw.len ) != 0 ) ) 00101 { 00102 polarssl_free( dst->peer_cert ); 00103 dst->peer_cert = NULL; 00104 return( ret ); 00105 } 00106 } 00107 #endif /* POLARSSL_X509_CRT_PARSE_C */ 00108 00109 #if defined(POLARSSL_SSL_SESSION_TICKETS) 00110 if( src->ticket != NULL ) 00111 { 00112 dst->ticket = (unsigned char *) polarssl_malloc( src->ticket_len ); 00113 if( dst->ticket == NULL ) 00114 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 00115 00116 memcpy( dst->ticket, src->ticket, src->ticket_len ); 00117 } 00118 #endif /* POLARSSL_SSL_SESSION_TICKETS */ 00119 00120 return( 0 ); 00121 } 00122 00123 #if defined(POLARSSL_SSL_HW_RECORD_ACCEL) 00124 int (*ssl_hw_record_init)(ssl_context *ssl, 00125 const unsigned char *key_enc, const unsigned char *key_dec, 00126 size_t keylen, 00127 const unsigned char *iv_enc, const unsigned char *iv_dec, 00128 size_t ivlen, 00129 const unsigned char *mac_enc, const unsigned char *mac_dec, 00130 size_t maclen) = NULL; 00131 int (*ssl_hw_record_activate)(ssl_context *ssl, int direction) = NULL; 00132 int (*ssl_hw_record_reset)(ssl_context *ssl) = NULL; 00133 int (*ssl_hw_record_write)(ssl_context *ssl) = NULL; 00134 int (*ssl_hw_record_read)(ssl_context *ssl) = NULL; 00135 int (*ssl_hw_record_finish)(ssl_context *ssl) = NULL; 00136 #endif /* POLARSSL_SSL_HW_RECORD_ACCEL */ 00137 00138 /* 00139 * Key material generation 00140 */ 00141 #if defined(POLARSSL_SSL_PROTO_SSL3) 00142 static int ssl3_prf( const unsigned char *secret, size_t slen, 00143 const char *label, 00144 const unsigned char *random, size_t rlen, 00145 unsigned char *dstbuf, size_t dlen ) 00146 { 00147 size_t i; 00148 md5_context md5; 00149 sha1_context sha1; 00150 unsigned char padding[16]; 00151 unsigned char sha1sum[20]; 00152 ((void)label); 00153 00154 /* 00155 * SSLv3: 00156 * block = 00157 * MD5( secret + SHA1( 'A' + secret + random ) ) + 00158 * MD5( secret + SHA1( 'BB' + secret + random ) ) + 00159 * MD5( secret + SHA1( 'CCC' + secret + random ) ) + 00160 * ... 00161 */ 00162 for( i = 0; i < dlen / 16; i++ ) 00163 { 00164 memset( padding, (unsigned char) ('A' + i), 1 + i ); 00165 00166 sha1_starts( &sha1 ); 00167 sha1_update( &sha1, padding, 1 + i ); 00168 sha1_update( &sha1, secret, slen ); 00169 sha1_update( &sha1, random, rlen ); 00170 sha1_finish( &sha1, sha1sum ); 00171 00172 md5_starts( &md5 ); 00173 md5_update( &md5, secret, slen ); 00174 md5_update( &md5, sha1sum, 20 ); 00175 md5_finish( &md5, dstbuf + i * 16 ); 00176 } 00177 00178 memset( &md5, 0, sizeof( md5 ) ); 00179 memset( &sha1, 0, sizeof( sha1 ) ); 00180 00181 memset( padding, 0, sizeof( padding ) ); 00182 memset( sha1sum, 0, sizeof( sha1sum ) ); 00183 00184 return( 0 ); 00185 } 00186 #endif /* POLARSSL_SSL_PROTO_SSL3 */ 00187 00188 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) 00189 static int tls1_prf( const unsigned char *secret, size_t slen, 00190 const char *label, 00191 const unsigned char *random, size_t rlen, 00192 unsigned char *dstbuf, size_t dlen ) 00193 { 00194 size_t nb, hs; 00195 size_t i, j, k; 00196 const unsigned char *S1, *S2; 00197 unsigned char tmp[128]; 00198 unsigned char h_i[20]; 00199 00200 if( sizeof( tmp ) < 20 + strlen( label ) + rlen ) 00201 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 00202 00203 hs = ( slen + 1 ) / 2; 00204 S1 = secret; 00205 S2 = secret + slen - hs; 00206 00207 nb = strlen( label ); 00208 memcpy( tmp + 20, label, nb ); 00209 memcpy( tmp + 20 + nb, random, rlen ); 00210 nb += rlen; 00211 00212 /* 00213 * First compute P_md5(secret,label+random)[0..dlen] 00214 */ 00215 md5_hmac( S1, hs, tmp + 20, nb, 4 + tmp ); 00216 00217 for( i = 0; i < dlen; i += 16 ) 00218 { 00219 md5_hmac( S1, hs, 4 + tmp, 16 + nb, h_i ); 00220 md5_hmac( S1, hs, 4 + tmp, 16, 4 + tmp ); 00221 00222 k = ( i + 16 > dlen ) ? dlen % 16 : 16; 00223 00224 for( j = 0; j < k; j++ ) 00225 dstbuf[i + j] = h_i[j]; 00226 } 00227 00228 /* 00229 * XOR out with P_sha1(secret,label+random)[0..dlen] 00230 */ 00231 sha1_hmac( S2, hs, tmp + 20, nb, tmp ); 00232 00233 for( i = 0; i < dlen; i += 20 ) 00234 { 00235 sha1_hmac( S2, hs, tmp, 20 + nb, h_i ); 00236 sha1_hmac( S2, hs, tmp, 20, tmp ); 00237 00238 k = ( i + 20 > dlen ) ? dlen % 20 : 20; 00239 00240 for( j = 0; j < k; j++ ) 00241 dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] ); 00242 } 00243 00244 memset( tmp, 0, sizeof( tmp ) ); 00245 memset( h_i, 0, sizeof( h_i ) ); 00246 00247 return( 0 ); 00248 } 00249 #endif /* POLARSSL_SSL_PROTO_TLS1) || POLARSSL_SSL_PROTO_TLS1_1 */ 00250 00251 #if defined(POLARSSL_SSL_PROTO_TLS1_2) 00252 #if defined(POLARSSL_SHA256_C) 00253 static int tls_prf_sha256( const unsigned char *secret, size_t slen, 00254 const char *label, 00255 const unsigned char *random, size_t rlen, 00256 unsigned char *dstbuf, size_t dlen ) 00257 { 00258 size_t nb; 00259 size_t i, j, k; 00260 unsigned char tmp[128]; 00261 unsigned char h_i[32]; 00262 00263 if( sizeof( tmp ) < 32 + strlen( label ) + rlen ) 00264 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 00265 00266 nb = strlen( label ); 00267 memcpy( tmp + 32, label, nb ); 00268 memcpy( tmp + 32 + nb, random, rlen ); 00269 nb += rlen; 00270 00271 /* 00272 * Compute P_<hash>(secret, label + random)[0..dlen] 00273 */ 00274 sha256_hmac( secret, slen, tmp + 32, nb, tmp, 0 ); 00275 00276 for( i = 0; i < dlen; i += 32 ) 00277 { 00278 sha256_hmac( secret, slen, tmp, 32 + nb, h_i, 0 ); 00279 sha256_hmac( secret, slen, tmp, 32, tmp, 0 ); 00280 00281 k = ( i + 32 > dlen ) ? dlen % 32 : 32; 00282 00283 for( j = 0; j < k; j++ ) 00284 dstbuf[i + j] = h_i[j]; 00285 } 00286 00287 memset( tmp, 0, sizeof( tmp ) ); 00288 memset( h_i, 0, sizeof( h_i ) ); 00289 00290 return( 0 ); 00291 } 00292 #endif /* POLARSSL_SHA256_C */ 00293 00294 #if defined(POLARSSL_SHA512_C) 00295 static int tls_prf_sha384( const unsigned char *secret, size_t slen, 00296 const char *label, 00297 const unsigned char *random, size_t rlen, 00298 unsigned char *dstbuf, size_t dlen ) 00299 { 00300 size_t nb; 00301 size_t i, j, k; 00302 unsigned char tmp[128]; 00303 unsigned char h_i[48]; 00304 00305 if( sizeof( tmp ) < 48 + strlen( label ) + rlen ) 00306 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 00307 00308 nb = strlen( label ); 00309 memcpy( tmp + 48, label, nb ); 00310 memcpy( tmp + 48 + nb, random, rlen ); 00311 nb += rlen; 00312 00313 /* 00314 * Compute P_<hash>(secret, label + random)[0..dlen] 00315 */ 00316 sha512_hmac( secret, slen, tmp + 48, nb, tmp, 1 ); 00317 00318 for( i = 0; i < dlen; i += 48 ) 00319 { 00320 sha512_hmac( secret, slen, tmp, 48 + nb, h_i, 1 ); 00321 sha512_hmac( secret, slen, tmp, 48, tmp, 1 ); 00322 00323 k = ( i + 48 > dlen ) ? dlen % 48 : 48; 00324 00325 for( j = 0; j < k; j++ ) 00326 dstbuf[i + j] = h_i[j]; 00327 } 00328 00329 memset( tmp, 0, sizeof( tmp ) ); 00330 memset( h_i, 0, sizeof( h_i ) ); 00331 00332 return( 0 ); 00333 } 00334 #endif /* POLARSSL_SHA512_C */ 00335 #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ 00336 00337 static void ssl_update_checksum_start(ssl_context *, const unsigned char *, size_t); 00338 00339 #if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \ 00340 defined(POLARSSL_SSL_PROTO_TLS1_1) 00341 static void ssl_update_checksum_md5sha1(ssl_context *, const unsigned char *, size_t); 00342 #endif 00343 00344 #if defined(POLARSSL_SSL_PROTO_SSL3) 00345 static void ssl_calc_verify_ssl(ssl_context *,unsigned char *); 00346 static void ssl_calc_finished_ssl(ssl_context *,unsigned char *,int); 00347 #endif 00348 00349 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) 00350 static void ssl_calc_verify_tls(ssl_context *,unsigned char *); 00351 static void ssl_calc_finished_tls(ssl_context *,unsigned char *,int); 00352 #endif 00353 00354 #if defined(POLARSSL_SSL_PROTO_TLS1_2) 00355 #if defined(POLARSSL_SHA256_C) 00356 static void ssl_update_checksum_sha256(ssl_context *, const unsigned char *, size_t); 00357 static void ssl_calc_verify_tls_sha256(ssl_context *,unsigned char *); 00358 static void ssl_calc_finished_tls_sha256(ssl_context *,unsigned char *,int); 00359 #endif 00360 00361 #if defined(POLARSSL_SHA512_C) 00362 static void ssl_update_checksum_sha384(ssl_context *, const unsigned char *, size_t); 00363 static void ssl_calc_verify_tls_sha384(ssl_context *,unsigned char *); 00364 static void ssl_calc_finished_tls_sha384(ssl_context *,unsigned char *,int); 00365 #endif 00366 #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ 00367 00368 int ssl_derive_keys( ssl_context *ssl ) 00369 { 00370 int ret = 0; 00371 unsigned char tmp[64]; 00372 unsigned char keyblk[256]; 00373 unsigned char *key1; 00374 unsigned char *key2; 00375 unsigned char *mac_enc; 00376 unsigned char *mac_dec; 00377 size_t iv_copy_len; 00378 const cipher_info_t *cipher_info; 00379 const md_info_t *md_info; 00380 00381 ssl_session *session = ssl->session_negotiate; 00382 ssl_transform *transform = ssl->transform_negotiate; 00383 ssl_handshake_params *handshake = ssl->handshake; 00384 00385 SSL_DEBUG_MSG( 2, ( "=> derive keys" ) ); 00386 00387 cipher_info = cipher_info_from_type( transform->ciphersuite_info->cipher ); 00388 if( cipher_info == NULL ) 00389 { 00390 SSL_DEBUG_MSG( 1, ( "cipher info for %d not found", 00391 transform->ciphersuite_info->cipher ) ); 00392 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 00393 } 00394 00395 md_info = md_info_from_type( transform->ciphersuite_info->mac ); 00396 if( md_info == NULL ) 00397 { 00398 SSL_DEBUG_MSG( 1, ( "md info for %d not found", 00399 transform->ciphersuite_info->mac ) ); 00400 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 00401 } 00402 00403 /* 00404 * Set appropriate PRF function and other SSL / TLS / TLS1.2 functions 00405 */ 00406 #if defined(POLARSSL_SSL_PROTO_SSL3) 00407 if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) 00408 { 00409 handshake->tls_prf = ssl3_prf; 00410 handshake->calc_verify = ssl_calc_verify_ssl; 00411 handshake->calc_finished = ssl_calc_finished_ssl; 00412 } 00413 else 00414 #endif 00415 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) 00416 if( ssl->minor_ver < SSL_MINOR_VERSION_3 ) 00417 { 00418 handshake->tls_prf = tls1_prf; 00419 handshake->calc_verify = ssl_calc_verify_tls; 00420 handshake->calc_finished = ssl_calc_finished_tls; 00421 } 00422 else 00423 #endif 00424 #if defined(POLARSSL_SSL_PROTO_TLS1_2) 00425 #if defined(POLARSSL_SHA512_C) 00426 if( ssl->minor_ver == SSL_MINOR_VERSION_3 && 00427 transform->ciphersuite_info->mac == POLARSSL_MD_SHA384 ) 00428 { 00429 handshake->tls_prf = tls_prf_sha384; 00430 handshake->calc_verify = ssl_calc_verify_tls_sha384; 00431 handshake->calc_finished = ssl_calc_finished_tls_sha384; 00432 } 00433 else 00434 #endif 00435 #if defined(POLARSSL_SHA256_C) 00436 if( ssl->minor_ver == SSL_MINOR_VERSION_3 ) 00437 { 00438 handshake->tls_prf = tls_prf_sha256; 00439 handshake->calc_verify = ssl_calc_verify_tls_sha256; 00440 handshake->calc_finished = ssl_calc_finished_tls_sha256; 00441 } 00442 else 00443 #endif 00444 #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ 00445 { 00446 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 00447 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 00448 } 00449 00450 /* 00451 * SSLv3: 00452 * master = 00453 * MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) + 00454 * MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) + 00455 * MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) ) 00456 * 00457 * TLSv1+: 00458 * master = PRF( premaster, "master secret", randbytes )[0..47] 00459 */ 00460 if( handshake->resume == 0 ) 00461 { 00462 SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster, 00463 handshake->pmslen ); 00464 00465 handshake->tls_prf( handshake->premaster, handshake->pmslen, 00466 "master secret", 00467 handshake->randbytes, 64, session->master, 48 ); 00468 00469 memset( handshake->premaster, 0, sizeof( handshake->premaster ) ); 00470 } 00471 else 00472 SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) ); 00473 00474 /* 00475 * Swap the client and server random values. 00476 */ 00477 memcpy( tmp, handshake->randbytes, 64 ); 00478 memcpy( handshake->randbytes, tmp + 32, 32 ); 00479 memcpy( handshake->randbytes + 32, tmp, 32 ); 00480 memset( tmp, 0, sizeof( tmp ) ); 00481 00482 /* 00483 * SSLv3: 00484 * key block = 00485 * MD5( master + SHA1( 'A' + master + randbytes ) ) + 00486 * MD5( master + SHA1( 'BB' + master + randbytes ) ) + 00487 * MD5( master + SHA1( 'CCC' + master + randbytes ) ) + 00488 * MD5( master + SHA1( 'DDDD' + master + randbytes ) ) + 00489 * ... 00490 * 00491 * TLSv1: 00492 * key block = PRF( master, "key expansion", randbytes ) 00493 */ 00494 handshake->tls_prf( session->master, 48, "key expansion", 00495 handshake->randbytes, 64, keyblk, 256 ); 00496 00497 SSL_DEBUG_MSG( 3, ( "ciphersuite = %s", 00498 ssl_get_ciphersuite_name( session->ciphersuite ) ) ); 00499 SSL_DEBUG_BUF( 3, "master secret", session->master, 48 ); 00500 SSL_DEBUG_BUF( 4, "random bytes", handshake->randbytes, 64 ); 00501 SSL_DEBUG_BUF( 4, "key block", keyblk, 256 ); 00502 00503 memset( handshake->randbytes, 0, sizeof( handshake->randbytes ) ); 00504 00505 /* 00506 * Determine the appropriate key, IV and MAC length. 00507 */ 00508 00509 if( cipher_info->mode == POLARSSL_MODE_GCM ) 00510 { 00511 transform->keylen = cipher_info->key_length; 00512 transform->keylen /= 8; 00513 transform->minlen = 1; 00514 transform->ivlen = 12; 00515 transform->fixed_ivlen = 4; 00516 transform->maclen = 0; 00517 } 00518 else 00519 { 00520 if( md_info->type != POLARSSL_MD_NONE ) 00521 { 00522 int ret; 00523 00524 if( ( ret = md_init_ctx( &transform->md_ctx_enc, md_info ) ) != 0 ) 00525 { 00526 SSL_DEBUG_RET( 1, "md_init_ctx", ret ); 00527 return( ret ); 00528 } 00529 00530 if( ( ret = md_init_ctx( &transform->md_ctx_dec, md_info ) ) != 0 ) 00531 { 00532 SSL_DEBUG_RET( 1, "md_init_ctx", ret ); 00533 return( ret ); 00534 } 00535 00536 transform->maclen = md_get_size( md_info ); 00537 00538 #if defined(POLARSSL_SSL_TRUNCATED_HMAC) 00539 /* 00540 * If HMAC is to be truncated, we shall keep the leftmost bytes, 00541 * (rfc 6066 page 13 or rfc 2104 section 4), 00542 * so we only need to adjust the length here. 00543 */ 00544 if( session->trunc_hmac == SSL_TRUNC_HMAC_ENABLED ) 00545 transform->maclen = SSL_TRUNCATED_HMAC_LEN; 00546 #endif /* POLARSSL_SSL_TRUNCATED_HMAC */ 00547 } 00548 00549 transform->keylen = cipher_info->key_length; 00550 transform->keylen /= 8; 00551 transform->ivlen = cipher_info->iv_size; 00552 00553 transform->minlen = transform->keylen; 00554 if( transform->minlen < transform->maclen ) 00555 { 00556 if( cipher_info->mode == POLARSSL_MODE_STREAM ) 00557 transform->minlen = transform->maclen; 00558 else 00559 transform->minlen += transform->keylen; 00560 } 00561 } 00562 00563 SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d", 00564 transform->keylen, transform->minlen, transform->ivlen, 00565 transform->maclen ) ); 00566 00567 /* 00568 * Finally setup the cipher contexts, IVs and MAC secrets. 00569 */ 00570 if( ssl->endpoint == SSL_IS_CLIENT ) 00571 { 00572 key1 = keyblk + transform->maclen * 2; 00573 key2 = keyblk + transform->maclen * 2 + transform->keylen; 00574 00575 mac_enc = keyblk; 00576 mac_dec = keyblk + transform->maclen; 00577 00578 /* 00579 * This is not used in TLS v1.1. 00580 */ 00581 iv_copy_len = ( transform->fixed_ivlen ) ? 00582 transform->fixed_ivlen : transform->ivlen; 00583 memcpy( transform->iv_enc, key2 + transform->keylen, iv_copy_len ); 00584 memcpy( transform->iv_dec, key2 + transform->keylen + iv_copy_len, 00585 iv_copy_len ); 00586 } 00587 else 00588 { 00589 key1 = keyblk + transform->maclen * 2 + transform->keylen; 00590 key2 = keyblk + transform->maclen * 2; 00591 00592 mac_enc = keyblk + transform->maclen; 00593 mac_dec = keyblk; 00594 00595 /* 00596 * This is not used in TLS v1.1. 00597 */ 00598 iv_copy_len = ( transform->fixed_ivlen ) ? 00599 transform->fixed_ivlen : transform->ivlen; 00600 memcpy( transform->iv_dec, key1 + transform->keylen, iv_copy_len ); 00601 memcpy( transform->iv_enc, key1 + transform->keylen + iv_copy_len, 00602 iv_copy_len ); 00603 } 00604 00605 #if defined(POLARSSL_SSL_PROTO_SSL3) 00606 if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) 00607 { 00608 if( transform->maclen > sizeof transform->mac_enc ) 00609 { 00610 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 00611 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 00612 } 00613 00614 memcpy( transform->mac_enc, mac_enc, transform->maclen ); 00615 memcpy( transform->mac_dec, mac_dec, transform->maclen ); 00616 } 00617 else 00618 #endif /* POLARSSL_SSL_PROTO_SSL3 */ 00619 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \ 00620 defined(POLARSSL_SSL_PROTO_TLS1_2) 00621 if( ssl->minor_ver >= SSL_MINOR_VERSION_1 ) 00622 { 00623 md_hmac_starts( &transform->md_ctx_enc, mac_enc, transform->maclen ); 00624 md_hmac_starts( &transform->md_ctx_dec, mac_dec, transform->maclen ); 00625 } 00626 else 00627 #endif 00628 { 00629 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 00630 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 00631 } 00632 00633 #if defined(POLARSSL_SSL_HW_RECORD_ACCEL) 00634 if( ssl_hw_record_init != NULL) 00635 { 00636 int ret = 0; 00637 00638 SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_init()" ) ); 00639 00640 if( ( ret = ssl_hw_record_init( ssl, key1, key2, transform->keylen, 00641 transform->iv_enc, transform->iv_dec, 00642 iv_copy_len, 00643 mac_enc, mac_dec, 00644 transform->maclen ) ) != 0 ) 00645 { 00646 SSL_DEBUG_RET( 1, "ssl_hw_record_init", ret ); 00647 return POLARSSL_ERR_SSL_HW_ACCEL_FAILED; 00648 } 00649 } 00650 #endif /* POLARSSL_SSL_HW_RECORD_ACCEL */ 00651 00652 if( ( ret = cipher_init_ctx( &transform->cipher_ctx_enc, 00653 cipher_info ) ) != 0 ) 00654 { 00655 SSL_DEBUG_RET( 1, "cipher_init_ctx", ret ); 00656 return( ret ); 00657 } 00658 00659 if( ( ret = cipher_init_ctx( &transform->cipher_ctx_dec, 00660 cipher_info ) ) != 0 ) 00661 { 00662 SSL_DEBUG_RET( 1, "cipher_init_ctx", ret ); 00663 return( ret ); 00664 } 00665 00666 if( ( ret = cipher_setkey( &transform->cipher_ctx_enc, key1, 00667 cipher_info->key_length, 00668 POLARSSL_ENCRYPT ) ) != 0 ) 00669 { 00670 SSL_DEBUG_RET( 1, "cipher_setkey", ret ); 00671 return( ret ); 00672 } 00673 00674 if( ( ret = cipher_setkey( &transform->cipher_ctx_dec, key2, 00675 cipher_info->key_length, 00676 POLARSSL_DECRYPT ) ) != 0 ) 00677 { 00678 SSL_DEBUG_RET( 1, "cipher_setkey", ret ); 00679 return( ret ); 00680 } 00681 00682 #if defined(POLARSSL_CIPHER_MODE_CBC) 00683 if( cipher_info->mode == POLARSSL_MODE_CBC ) 00684 { 00685 if( ( ret = cipher_set_padding_mode( &transform->cipher_ctx_enc, 00686 POLARSSL_PADDING_NONE ) ) != 0 ) 00687 { 00688 SSL_DEBUG_RET( 1, "cipher_set_padding_mode", ret ); 00689 return( ret ); 00690 } 00691 00692 if( ( ret = cipher_set_padding_mode( &transform->cipher_ctx_dec, 00693 POLARSSL_PADDING_NONE ) ) != 0 ) 00694 { 00695 SSL_DEBUG_RET( 1, "cipher_set_padding_mode", ret ); 00696 return( ret ); 00697 } 00698 } 00699 #endif /* POLARSSL_CIPHER_MODE_CBC */ 00700 00701 memset( keyblk, 0, sizeof( keyblk ) ); 00702 00703 #if defined(POLARSSL_ZLIB_SUPPORT) 00704 // Initialize compression 00705 // 00706 if( session->compression == SSL_COMPRESS_DEFLATE ) 00707 { 00708 if( ssl->compress_buf == NULL ) 00709 { 00710 SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) ); 00711 ssl->compress_buf = polarssl_malloc( SSL_BUFFER_LEN ); 00712 if( ssl->compress_buf == NULL ) 00713 { 00714 SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", 00715 SSL_BUFFER_LEN ) ); 00716 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 00717 } 00718 } 00719 00720 SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) ); 00721 00722 memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) ); 00723 memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) ); 00724 00725 if( deflateInit( &transform->ctx_deflate, 00726 Z_DEFAULT_COMPRESSION ) != Z_OK || 00727 inflateInit( &transform->ctx_inflate ) != Z_OK ) 00728 { 00729 SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) ); 00730 return( POLARSSL_ERR_SSL_COMPRESSION_FAILED ); 00731 } 00732 } 00733 #endif /* POLARSSL_ZLIB_SUPPORT */ 00734 00735 SSL_DEBUG_MSG( 2, ( "<= derive keys" ) ); 00736 00737 return( 0 ); 00738 } 00739 00740 #if defined(POLARSSL_SSL_PROTO_SSL3) 00741 void ssl_calc_verify_ssl( ssl_context *ssl, unsigned char hash[36] ) 00742 { 00743 md5_context md5; 00744 sha1_context sha1; 00745 unsigned char pad_1[48]; 00746 unsigned char pad_2[48]; 00747 00748 SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) ); 00749 00750 memcpy( &md5 , &ssl->handshake->fin_md5 , sizeof(md5_context) ); 00751 memcpy( &sha1, &ssl->handshake->fin_sha1, sizeof(sha1_context) ); 00752 00753 memset( pad_1, 0x36, 48 ); 00754 memset( pad_2, 0x5C, 48 ); 00755 00756 md5_update( &md5, ssl->session_negotiate->master, 48 ); 00757 md5_update( &md5, pad_1, 48 ); 00758 md5_finish( &md5, hash ); 00759 00760 md5_starts( &md5 ); 00761 md5_update( &md5, ssl->session_negotiate->master, 48 ); 00762 md5_update( &md5, pad_2, 48 ); 00763 md5_update( &md5, hash, 16 ); 00764 md5_finish( &md5, hash ); 00765 00766 sha1_update( &sha1, ssl->session_negotiate->master, 48 ); 00767 sha1_update( &sha1, pad_1, 40 ); 00768 sha1_finish( &sha1, hash + 16 ); 00769 00770 sha1_starts( &sha1 ); 00771 sha1_update( &sha1, ssl->session_negotiate->master, 48 ); 00772 sha1_update( &sha1, pad_2, 40 ); 00773 sha1_update( &sha1, hash + 16, 20 ); 00774 sha1_finish( &sha1, hash + 16 ); 00775 00776 SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 ); 00777 SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); 00778 00779 return; 00780 } 00781 #endif /* POLARSSL_SSL_PROTO_SSL3 */ 00782 00783 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) 00784 void ssl_calc_verify_tls( ssl_context *ssl, unsigned char hash[36] ) 00785 { 00786 md5_context md5; 00787 sha1_context sha1; 00788 00789 SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) ); 00790 00791 memcpy( &md5 , &ssl->handshake->fin_md5 , sizeof(md5_context) ); 00792 memcpy( &sha1, &ssl->handshake->fin_sha1, sizeof(sha1_context) ); 00793 00794 md5_finish( &md5, hash ); 00795 sha1_finish( &sha1, hash + 16 ); 00796 00797 SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 ); 00798 SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); 00799 00800 return; 00801 } 00802 #endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 */ 00803 00804 #if defined(POLARSSL_SSL_PROTO_TLS1_2) 00805 #if defined(POLARSSL_SHA256_C) 00806 void ssl_calc_verify_tls_sha256( ssl_context *ssl, unsigned char hash[32] ) 00807 { 00808 sha256_context sha256; 00809 00810 SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) ); 00811 00812 memcpy( &sha256, &ssl->handshake->fin_sha256, sizeof(sha256_context) ); 00813 sha256_finish( &sha256, hash ); 00814 00815 SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 ); 00816 SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); 00817 00818 return; 00819 } 00820 #endif /* POLARSSL_SHA256_C */ 00821 00822 #if defined(POLARSSL_SHA512_C) 00823 void ssl_calc_verify_tls_sha384( ssl_context *ssl, unsigned char hash[48] ) 00824 { 00825 sha512_context sha512; 00826 00827 SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) ); 00828 00829 memcpy( &sha512, &ssl->handshake->fin_sha512, sizeof(sha512_context) ); 00830 sha512_finish( &sha512, hash ); 00831 00832 SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 ); 00833 SSL_DEBUG_MSG( 2, ( "<= calc verify" ) ); 00834 00835 return; 00836 } 00837 #endif /* POLARSSL_SHA512_C */ 00838 #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ 00839 00840 #if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED) 00841 int ssl_psk_derive_premaster( ssl_context *ssl, key_exchange_type_t key_ex ) 00842 { 00843 unsigned char *p = ssl->handshake->premaster; 00844 unsigned char *end = p + sizeof( ssl->handshake->premaster ); 00845 00846 /* 00847 * PMS = struct { 00848 * opaque other_secret<0..2^16-1>; 00849 * opaque psk<0..2^16-1>; 00850 * }; 00851 * with "other_secret" depending on the particular key exchange 00852 */ 00853 #if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED) 00854 if( key_ex == POLARSSL_KEY_EXCHANGE_PSK ) 00855 { 00856 if( end - p < 2 + (int) ssl->psk_len ) 00857 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 00858 00859 *(p++) = (unsigned char)( ssl->psk_len >> 8 ); 00860 *(p++) = (unsigned char)( ssl->psk_len ); 00861 p += ssl->psk_len; 00862 } 00863 else 00864 #endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */ 00865 #if defined(POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED) 00866 if( key_ex == POLARSSL_KEY_EXCHANGE_RSA_PSK ) 00867 { 00868 /* 00869 * other_secret already set by the ClientKeyExchange message, 00870 * and is 48 bytes long 00871 */ 00872 *p++ = 0; 00873 *p++ = 48; 00874 p += 48; 00875 } 00876 else 00877 #endif /* POLARSSL_KEY_EXCHANGE_RSA_PKS_ENABLED */ 00878 #if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED) 00879 if( key_ex == POLARSSL_KEY_EXCHANGE_DHE_PSK ) 00880 { 00881 int ret; 00882 size_t len = ssl->handshake->dhm_ctx.len; 00883 00884 if( end - p < 2 + (int) len ) 00885 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 00886 00887 *(p++) = (unsigned char)( len >> 8 ); 00888 *(p++) = (unsigned char)( len ); 00889 if( ( ret = dhm_calc_secret( &ssl->handshake->dhm_ctx, 00890 p, &len, ssl->f_rng, ssl->p_rng ) ) != 0 ) 00891 { 00892 SSL_DEBUG_RET( 1, "dhm_calc_secret", ret ); 00893 return( ret ); 00894 } 00895 p += len; 00896 00897 SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K ); 00898 } 00899 else 00900 #endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */ 00901 #if defined(POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED) 00902 if( key_ex == POLARSSL_KEY_EXCHANGE_ECDHE_PSK ) 00903 { 00904 int ret; 00905 size_t zlen; 00906 00907 if( ( ret = ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen, 00908 p + 2, end - (p + 2), 00909 ssl->f_rng, ssl->p_rng ) ) != 0 ) 00910 { 00911 SSL_DEBUG_RET( 1, "ecdh_calc_secret", ret ); 00912 return( ret ); 00913 } 00914 00915 *(p++) = (unsigned char)( zlen >> 8 ); 00916 *(p++) = (unsigned char)( zlen ); 00917 p += zlen; 00918 00919 SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z ); 00920 } 00921 else 00922 #endif /* POLARSSL_KEY_EXCHANGE_ECDHE_PSK_ENABLED */ 00923 { 00924 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 00925 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 00926 } 00927 00928 /* opaque psk<0..2^16-1>; */ 00929 if( end - p < 2 + (int) ssl->psk_len ) 00930 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 00931 00932 *(p++) = (unsigned char)( ssl->psk_len >> 8 ); 00933 *(p++) = (unsigned char)( ssl->psk_len ); 00934 memcpy( p, ssl->psk, ssl->psk_len ); 00935 p += ssl->psk_len; 00936 00937 ssl->handshake->pmslen = p - ssl->handshake->premaster; 00938 00939 return( 0 ); 00940 } 00941 #endif /* POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED */ 00942 00943 #if defined(POLARSSL_SSL_PROTO_SSL3) 00944 /* 00945 * SSLv3.0 MAC functions 00946 */ 00947 static void ssl_mac( md_context_t *md_ctx, unsigned char *secret, 00948 unsigned char *buf, size_t len, 00949 unsigned char *ctr, int type ) 00950 { 00951 unsigned char header[11]; 00952 unsigned char padding[48]; 00953 int padlen = 0; 00954 int md_size = md_get_size( md_ctx->md_info ); 00955 int md_type = md_get_type( md_ctx->md_info ); 00956 00957 if( md_type == POLARSSL_MD_MD5 ) 00958 padlen = 48; 00959 else if( md_type == POLARSSL_MD_SHA1 ) 00960 padlen = 40; 00961 else if( md_type == POLARSSL_MD_SHA256 ) 00962 padlen = 32; 00963 else if( md_type == POLARSSL_MD_SHA384 ) 00964 padlen = 16; 00965 00966 memcpy( header, ctr, 8 ); 00967 header[ 8] = (unsigned char) type; 00968 header[ 9] = (unsigned char)( len >> 8 ); 00969 header[10] = (unsigned char)( len ); 00970 00971 memset( padding, 0x36, padlen ); 00972 md_starts( md_ctx ); 00973 md_update( md_ctx, secret, md_size ); 00974 md_update( md_ctx, padding, padlen ); 00975 md_update( md_ctx, header, 11 ); 00976 md_update( md_ctx, buf, len ); 00977 md_finish( md_ctx, buf + len ); 00978 00979 memset( padding, 0x5C, padlen ); 00980 md_starts( md_ctx ); 00981 md_update( md_ctx, secret, md_size ); 00982 md_update( md_ctx, padding, padlen ); 00983 md_update( md_ctx, buf + len, md_size ); 00984 md_finish( md_ctx, buf + len ); 00985 } 00986 #endif /* POLARSSL_SSL_PROTO_SSL3 */ 00987 00988 /* 00989 * Encryption/decryption functions 00990 */ 00991 static int ssl_encrypt_buf( ssl_context *ssl ) 00992 { 00993 size_t i; 00994 00995 SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) ); 00996 00997 /* 00998 * Add MAC before encrypt, except for GCM 00999 */ 01000 #if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER) || \ 01001 ( defined(POLARSSL_CIPHER_MODE_CBC) && \ 01002 ( defined(POLARSSL_AES_C) || defined(POLARSSL_CAMELLIA_C) ) ) 01003 if( ssl->transform_out->cipher_ctx_enc.cipher_info->mode != 01004 POLARSSL_MODE_GCM ) 01005 { 01006 #if defined(POLARSSL_SSL_PROTO_SSL3) 01007 if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) 01008 { 01009 ssl_mac( &ssl->transform_out->md_ctx_enc, 01010 ssl->transform_out->mac_enc, 01011 ssl->out_msg, ssl->out_msglen, 01012 ssl->out_ctr, ssl->out_msgtype ); 01013 } 01014 else 01015 #endif 01016 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \ 01017 defined(POLARSSL_SSL_PROTO_TLS1_2) 01018 if( ssl->minor_ver >= SSL_MINOR_VERSION_1 ) 01019 { 01020 md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_ctr, 13 ); 01021 md_hmac_update( &ssl->transform_out->md_ctx_enc, 01022 ssl->out_msg, ssl->out_msglen ); 01023 md_hmac_finish( &ssl->transform_out->md_ctx_enc, 01024 ssl->out_msg + ssl->out_msglen ); 01025 md_hmac_reset( &ssl->transform_out->md_ctx_enc ); 01026 } 01027 else 01028 #endif 01029 { 01030 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 01031 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 01032 } 01033 01034 SSL_DEBUG_BUF( 4, "computed mac", 01035 ssl->out_msg + ssl->out_msglen, 01036 ssl->transform_out->maclen ); 01037 01038 ssl->out_msglen += ssl->transform_out->maclen; 01039 } 01040 #endif /* GCM not the only option */ 01041 01042 /* 01043 * Encrypt 01044 */ 01045 #if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER) 01046 if( ssl->transform_out->cipher_ctx_enc.cipher_info->mode == 01047 POLARSSL_MODE_STREAM ) 01048 { 01049 int ret; 01050 size_t olen = 0; 01051 01052 SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " 01053 "including %d bytes of padding", 01054 ssl->out_msglen, 0 ) ); 01055 01056 SSL_DEBUG_BUF( 4, "before encrypt: output payload", 01057 ssl->out_msg, ssl->out_msglen ); 01058 01059 if( ( ret = cipher_reset( &ssl->transform_out->cipher_ctx_enc ) ) != 0 ) 01060 { 01061 SSL_DEBUG_RET( 1, "cipher_reset", ret ); 01062 return( ret ); 01063 } 01064 01065 if( ( ret = cipher_set_iv( &ssl->transform_out->cipher_ctx_enc, 01066 ssl->transform_out->iv_enc, 01067 ssl->transform_out->ivlen ) ) != 0 ) 01068 { 01069 SSL_DEBUG_RET( 1, "cipher_set_iv", ret ); 01070 return( ret ); 01071 } 01072 01073 if( ( ret = cipher_update( &ssl->transform_out->cipher_ctx_enc, 01074 ssl->out_msg, ssl->out_msglen, ssl->out_msg, 01075 &olen ) ) != 0 ) 01076 { 01077 SSL_DEBUG_RET( 1, "cipher_update", ret ); 01078 return( ret ); 01079 } 01080 01081 if( ssl->out_msglen != olen ) 01082 { 01083 SSL_DEBUG_MSG( 1, ( "total encrypted length incorrect %d %d", 01084 ssl->out_msglen, olen ) ); 01085 return( POLARSSL_ERR_SSL_INTERNAL_ERROR ); 01086 } 01087 01088 if( ( ret = cipher_finish( &ssl->transform_out->cipher_ctx_enc, 01089 ssl->out_msg + olen, &olen ) ) != 0 ) 01090 { 01091 SSL_DEBUG_RET( 1, "cipher_finish", ret ); 01092 return( ret ); 01093 } 01094 01095 if( 0 != olen ) 01096 { 01097 SSL_DEBUG_MSG( 1, ( "total encrypted length incorrect %d %d", 01098 0, olen ) ); 01099 return( POLARSSL_ERR_SSL_INTERNAL_ERROR ); 01100 } 01101 } 01102 else 01103 #endif /* POLARSSL_ARC4_C || POLARSSL_CIPHER_NULL_CIPHER */ 01104 #if defined(POLARSSL_GCM_C) 01105 if( ssl->transform_out->cipher_ctx_enc.cipher_info->mode == 01106 POLARSSL_MODE_GCM ) 01107 { 01108 size_t enc_msglen, olen, totlen; 01109 unsigned char *enc_msg; 01110 unsigned char add_data[13]; 01111 int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; 01112 01113 memcpy( add_data, ssl->out_ctr, 8 ); 01114 add_data[8] = ssl->out_msgtype; 01115 add_data[9] = ssl->major_ver; 01116 add_data[10] = ssl->minor_ver; 01117 add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF; 01118 add_data[12] = ssl->out_msglen & 0xFF; 01119 01120 SSL_DEBUG_BUF( 4, "additional data used for AEAD", 01121 add_data, 13 ); 01122 01123 /* 01124 * Generate IV 01125 */ 01126 ret = ssl->f_rng( ssl->p_rng, 01127 ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen, 01128 ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen ); 01129 if( ret != 0 ) 01130 return( ret ); 01131 01132 memcpy( ssl->out_iv, 01133 ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen, 01134 ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen ); 01135 01136 SSL_DEBUG_BUF( 4, "IV used", ssl->out_iv, 01137 ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen ); 01138 01139 /* 01140 * Fix pointer positions and message length with added IV 01141 */ 01142 enc_msg = ssl->out_msg; 01143 enc_msglen = ssl->out_msglen; 01144 ssl->out_msglen += ssl->transform_out->ivlen - 01145 ssl->transform_out->fixed_ivlen; 01146 01147 SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " 01148 "including %d bytes of padding", 01149 ssl->out_msglen, 0 ) ); 01150 01151 SSL_DEBUG_BUF( 4, "before encrypt: output payload", 01152 ssl->out_msg, ssl->out_msglen ); 01153 01154 /* 01155 * Encrypt 01156 */ 01157 if( ( ret = cipher_set_iv( &ssl->transform_out->cipher_ctx_enc, 01158 ssl->transform_out->iv_enc, 01159 ssl->transform_out->ivlen ) ) != 0 || 01160 ( ret = cipher_reset( &ssl->transform_out->cipher_ctx_enc ) ) != 0 ) 01161 { 01162 return( ret ); 01163 } 01164 01165 if( ( ret = cipher_update_ad( &ssl->transform_out->cipher_ctx_enc, 01166 add_data, 13 ) ) != 0 ) 01167 { 01168 return( ret ); 01169 } 01170 01171 if( ( ret = cipher_update( &ssl->transform_out->cipher_ctx_enc, 01172 enc_msg, enc_msglen, 01173 enc_msg, &olen ) ) != 0 ) 01174 { 01175 return( ret ); 01176 } 01177 totlen = olen; 01178 01179 if( ( ret = cipher_finish( &ssl->transform_out->cipher_ctx_enc, 01180 enc_msg + olen, &olen ) ) != 0 ) 01181 { 01182 return( ret ); 01183 } 01184 totlen += olen; 01185 01186 if( totlen != enc_msglen ) 01187 { 01188 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 01189 return( -1 ); 01190 } 01191 01192 /* 01193 * Authenticate 01194 */ 01195 ssl->out_msglen += 16; 01196 01197 if( ( ret = cipher_write_tag( &ssl->transform_out->cipher_ctx_enc, 01198 enc_msg + enc_msglen, 16 ) ) != 0 ) 01199 { 01200 return( ret ); 01201 } 01202 01203 SSL_DEBUG_BUF( 4, "after encrypt: tag", enc_msg + enc_msglen, 16 ); 01204 } 01205 else 01206 #endif /* POLARSSL_GCM_C */ 01207 #if defined(POLARSSL_CIPHER_MODE_CBC) && \ 01208 ( defined(POLARSSL_AES_C) || defined(POLARSSL_CAMELLIA_C) ) 01209 if( ssl->transform_out->cipher_ctx_enc.cipher_info->mode == 01210 POLARSSL_MODE_CBC ) 01211 { 01212 int ret; 01213 unsigned char *enc_msg; 01214 size_t enc_msglen, padlen, olen = 0; 01215 01216 padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) % 01217 ssl->transform_out->ivlen; 01218 if( padlen == ssl->transform_out->ivlen ) 01219 padlen = 0; 01220 01221 for( i = 0; i <= padlen; i++ ) 01222 ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen; 01223 01224 ssl->out_msglen += padlen + 1; 01225 01226 enc_msglen = ssl->out_msglen; 01227 enc_msg = ssl->out_msg; 01228 01229 #if defined(POLARSSL_SSL_PROTO_TLS1_1) || defined(POLARSSL_SSL_PROTO_TLS1_2) 01230 /* 01231 * Prepend per-record IV for block cipher in TLS v1.1 and up as per 01232 * Method 1 (6.2.3.2. in RFC4346 and RFC5246) 01233 */ 01234 if( ssl->minor_ver >= SSL_MINOR_VERSION_2 ) 01235 { 01236 /* 01237 * Generate IV 01238 */ 01239 int ret = ssl->f_rng( ssl->p_rng, ssl->transform_out->iv_enc, 01240 ssl->transform_out->ivlen ); 01241 if( ret != 0 ) 01242 return( ret ); 01243 01244 memcpy( ssl->out_iv, ssl->transform_out->iv_enc, 01245 ssl->transform_out->ivlen ); 01246 01247 /* 01248 * Fix pointer positions and message length with added IV 01249 */ 01250 enc_msg = ssl->out_msg; 01251 enc_msglen = ssl->out_msglen; 01252 ssl->out_msglen += ssl->transform_out->ivlen; 01253 } 01254 #endif /* POLARSSL_SSL_PROTO_TLS1_1 || POLARSSL_SSL_PROTO_TLS1_2 */ 01255 01256 SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, " 01257 "including %d bytes of IV and %d bytes of padding", 01258 ssl->out_msglen, ssl->transform_out->ivlen, 01259 padlen + 1 ) ); 01260 01261 SSL_DEBUG_BUF( 4, "before encrypt: output payload", 01262 ssl->out_iv, ssl->out_msglen ); 01263 01264 if( ( ret = cipher_reset( &ssl->transform_out->cipher_ctx_enc ) ) != 0 ) 01265 { 01266 SSL_DEBUG_RET( 1, "cipher_reset", ret ); 01267 return( ret ); 01268 } 01269 01270 if( ( ret = cipher_set_iv( &ssl->transform_out->cipher_ctx_enc, 01271 ssl->transform_out->iv_enc, 01272 ssl->transform_out->ivlen ) ) != 0 ) 01273 { 01274 SSL_DEBUG_RET( 1, "cipher_set_iv", ret ); 01275 return( ret ); 01276 } 01277 01278 if( ( ret = cipher_update( &ssl->transform_out->cipher_ctx_enc, 01279 enc_msg, enc_msglen, enc_msg, 01280 &olen ) ) != 0 ) 01281 { 01282 SSL_DEBUG_RET( 1, "cipher_update", ret ); 01283 return( ret ); 01284 } 01285 01286 enc_msglen -= olen; 01287 01288 if( ( ret = cipher_finish( &ssl->transform_out->cipher_ctx_enc, 01289 enc_msg + olen, &olen ) ) != 0 ) 01290 { 01291 SSL_DEBUG_RET( 1, "cipher_finish", ret ); 01292 return( ret ); 01293 } 01294 01295 if( enc_msglen != olen ) 01296 { 01297 SSL_DEBUG_MSG( 1, ( "total encrypted length incorrect %d %d", 01298 enc_msglen, olen ) ); 01299 return( POLARSSL_ERR_SSL_INTERNAL_ERROR ); 01300 } 01301 01302 #if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) 01303 if( ssl->minor_ver < SSL_MINOR_VERSION_2 ) 01304 { 01305 /* 01306 * Save IV in SSL3 and TLS1 01307 */ 01308 memcpy( ssl->transform_out->iv_enc, 01309 ssl->transform_out->cipher_ctx_enc.iv, 01310 ssl->transform_out->ivlen ); 01311 } 01312 #endif 01313 } 01314 else 01315 #endif /* POLARSSL_CIPHER_MODE_CBC && 01316 ( POLARSSL_AES_C || POLARSSL_CAMELLIA_C ) */ 01317 { 01318 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 01319 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 01320 } 01321 01322 for( i = 8; i > 0; i-- ) 01323 if( ++ssl->out_ctr[i - 1] != 0 ) 01324 break; 01325 01326 /* The loops goes to its end iff the counter is wrapping */ 01327 if( i == 0 ) 01328 { 01329 SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) ); 01330 return( POLARSSL_ERR_SSL_COUNTER_WRAPPING ); 01331 } 01332 01333 SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) ); 01334 01335 return( 0 ); 01336 } 01337 01338 #define POLARSSL_SSL_MAX_MAC_SIZE 48 01339 01340 static int ssl_decrypt_buf( ssl_context *ssl ) 01341 { 01342 size_t i; 01343 #if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER) || \ 01344 ( defined(POLARSSL_CIPHER_MODE_CBC) && \ 01345 ( defined(POLARSSL_AES_C) || defined(POLARSSL_CAMELLIA_C) ) ) 01346 size_t padlen = 0, correct = 1; 01347 #endif 01348 01349 SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) ); 01350 01351 if( ssl->in_msglen < ssl->transform_in->minlen ) 01352 { 01353 SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)", 01354 ssl->in_msglen, ssl->transform_in->minlen ) ); 01355 return( POLARSSL_ERR_SSL_INVALID_MAC ); 01356 } 01357 01358 #if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER) 01359 if( ssl->transform_in->cipher_ctx_dec.cipher_info->mode == 01360 POLARSSL_MODE_STREAM ) 01361 { 01362 int ret; 01363 size_t olen = 0; 01364 01365 padlen = 0; 01366 01367 if( ( ret = cipher_reset( &ssl->transform_in->cipher_ctx_dec ) ) != 0 ) 01368 { 01369 SSL_DEBUG_RET( 1, "cipher_reset", ret ); 01370 return( ret ); 01371 } 01372 01373 if( ( ret = cipher_set_iv( &ssl->transform_in->cipher_ctx_dec, 01374 ssl->transform_in->iv_dec, 01375 ssl->transform_in->ivlen ) ) != 0 ) 01376 { 01377 SSL_DEBUG_RET( 1, "cipher_set_iv", ret ); 01378 return( ret ); 01379 } 01380 01381 if( ( ret = cipher_update( &ssl->transform_in->cipher_ctx_dec, 01382 ssl->in_msg, ssl->in_msglen, ssl->in_msg, 01383 &olen ) ) != 0 ) 01384 { 01385 SSL_DEBUG_RET( 1, "cipher_update", ret ); 01386 return( ret ); 01387 } 01388 01389 if( ssl->in_msglen != olen ) 01390 { 01391 SSL_DEBUG_MSG( 1, ( "total encrypted length incorrect" ) ); 01392 return( POLARSSL_ERR_SSL_INTERNAL_ERROR ); 01393 } 01394 01395 if( ( ret = cipher_finish( &ssl->transform_in->cipher_ctx_dec, 01396 ssl->in_msg + olen, &olen ) ) != 0 ) 01397 { 01398 SSL_DEBUG_RET( 1, "cipher_finish", ret ); 01399 return( ret ); 01400 } 01401 01402 if( 0 != olen ) 01403 { 01404 SSL_DEBUG_MSG( 1, ( "total encrypted length incorrect" ) ); 01405 return( POLARSSL_ERR_SSL_INTERNAL_ERROR ); 01406 } 01407 } 01408 else 01409 #endif /* POLARSSL_ARC4_C || POLARSSL_CIPHER_NULL_CIPHER */ 01410 #if defined(POLARSSL_GCM_C) 01411 if( ssl->transform_in->cipher_ctx_dec.cipher_info->mode == 01412 POLARSSL_MODE_GCM ) 01413 { 01414 unsigned char *dec_msg; 01415 unsigned char *dec_msg_result; 01416 size_t dec_msglen, olen, totlen; 01417 unsigned char add_data[13]; 01418 int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; 01419 01420 dec_msglen = ssl->in_msglen - ( ssl->transform_in->ivlen - 01421 ssl->transform_in->fixed_ivlen ); 01422 dec_msglen -= 16; 01423 dec_msg = ssl->in_msg; 01424 dec_msg_result = ssl->in_msg; 01425 ssl->in_msglen = dec_msglen; 01426 01427 memcpy( add_data, ssl->in_ctr, 8 ); 01428 add_data[8] = ssl->in_msgtype; 01429 add_data[9] = ssl->major_ver; 01430 add_data[10] = ssl->minor_ver; 01431 add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF; 01432 add_data[12] = ssl->in_msglen & 0xFF; 01433 01434 SSL_DEBUG_BUF( 4, "additional data used for AEAD", 01435 add_data, 13 ); 01436 01437 memcpy( ssl->transform_in->iv_dec + ssl->transform_in->fixed_ivlen, 01438 ssl->in_iv, 01439 ssl->transform_in->ivlen - ssl->transform_in->fixed_ivlen ); 01440 01441 SSL_DEBUG_BUF( 4, "IV used", ssl->transform_in->iv_dec, 01442 ssl->transform_in->ivlen ); 01443 SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, 16 ); 01444 01445 /* 01446 * Decrypt 01447 */ 01448 if( ( ret = cipher_set_iv( &ssl->transform_in->cipher_ctx_dec, 01449 ssl->transform_in->iv_dec, 01450 ssl->transform_in->ivlen ) ) != 0 || 01451 ( ret = cipher_reset( &ssl->transform_in->cipher_ctx_dec ) ) != 0 ) 01452 { 01453 return( ret ); 01454 } 01455 01456 if( ( ret = cipher_update_ad( &ssl->transform_in->cipher_ctx_dec, 01457 add_data, 13 ) ) != 0 ) 01458 { 01459 return( ret ); 01460 } 01461 01462 if( ( ret = cipher_update( &ssl->transform_in->cipher_ctx_dec, 01463 dec_msg, dec_msglen, 01464 dec_msg_result, &olen ) ) != 0 ) 01465 { 01466 return( ret ); 01467 } 01468 totlen = olen; 01469 01470 if( ( ret = cipher_finish( &ssl->transform_in->cipher_ctx_dec, 01471 dec_msg_result + olen, &olen ) ) != 0 ) 01472 { 01473 return( ret ); 01474 } 01475 totlen += olen; 01476 01477 if( totlen != dec_msglen ) 01478 { 01479 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 01480 return( -1 ); 01481 } 01482 01483 /* 01484 * Authenticate 01485 */ 01486 if( ( ret = cipher_check_tag( &ssl->transform_in->cipher_ctx_dec, 01487 dec_msg + dec_msglen, 16 ) ) != 0 ) 01488 { 01489 SSL_DEBUG_RET( 1, "cipher_check_tag", ret ); 01490 return( POLARSSL_ERR_SSL_INVALID_MAC ); 01491 } 01492 01493 } 01494 else 01495 #endif /* POLARSSL_GCM_C */ 01496 #if defined(POLARSSL_CIPHER_MODE_CBC) && \ 01497 ( defined(POLARSSL_AES_C) || defined(POLARSSL_CAMELLIA_C) ) 01498 if( ssl->transform_in->cipher_ctx_dec.cipher_info->mode == 01499 POLARSSL_MODE_CBC ) 01500 { 01501 /* 01502 * Decrypt and check the padding 01503 */ 01504 int ret; 01505 unsigned char *dec_msg; 01506 unsigned char *dec_msg_result; 01507 size_t dec_msglen; 01508 size_t minlen = 0; 01509 size_t olen = 0; 01510 01511 /* 01512 * Check immediate ciphertext sanity 01513 */ 01514 if( ssl->in_msglen % ssl->transform_in->ivlen != 0 ) 01515 { 01516 SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0", 01517 ssl->in_msglen, ssl->transform_in->ivlen ) ); 01518 return( POLARSSL_ERR_SSL_INVALID_MAC ); 01519 } 01520 01521 #if defined(POLARSSL_SSL_PROTO_TLS1_1) || defined(POLARSSL_SSL_PROTO_TLS1_2) 01522 if( ssl->minor_ver >= SSL_MINOR_VERSION_2 ) 01523 minlen += ssl->transform_in->ivlen; 01524 #endif 01525 01526 if( ssl->in_msglen < minlen + ssl->transform_in->ivlen || 01527 ssl->in_msglen < minlen + ssl->transform_in->maclen + 1 ) 01528 { 01529 SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) " 01530 "+ 1 ) ( + expl IV )", ssl->in_msglen, 01531 ssl->transform_in->ivlen, 01532 ssl->transform_in->maclen ) ); 01533 return( POLARSSL_ERR_SSL_INVALID_MAC ); 01534 } 01535 01536 dec_msglen = ssl->in_msglen; 01537 dec_msg = ssl->in_msg; 01538 dec_msg_result = ssl->in_msg; 01539 01540 #if defined(POLARSSL_SSL_PROTO_TLS1_1) || defined(POLARSSL_SSL_PROTO_TLS1_2) 01541 /* 01542 * Initialize for prepended IV for block cipher in TLS v1.1 and up 01543 */ 01544 if( ssl->minor_ver >= SSL_MINOR_VERSION_2 ) 01545 { 01546 dec_msglen -= ssl->transform_in->ivlen; 01547 ssl->in_msglen -= ssl->transform_in->ivlen; 01548 01549 for( i = 0; i < ssl->transform_in->ivlen; i++ ) 01550 ssl->transform_in->iv_dec[i] = ssl->in_iv[i]; 01551 } 01552 #endif /* POLARSSL_SSL_PROTO_TLS1_1 || POLARSSL_SSL_PROTO_TLS1_2 */ 01553 01554 if( ( ret = cipher_reset( &ssl->transform_in->cipher_ctx_dec ) ) != 0 ) 01555 { 01556 SSL_DEBUG_RET( 1, "cipher_reset", ret ); 01557 return( ret ); 01558 } 01559 01560 if( ( ret = cipher_set_iv( &ssl->transform_in->cipher_ctx_dec, 01561 ssl->transform_in->iv_dec, 01562 ssl->transform_in->ivlen ) ) != 0 ) 01563 { 01564 SSL_DEBUG_RET( 1, "cipher_set_iv", ret ); 01565 return( ret ); 01566 } 01567 01568 if( ( ret = cipher_update( &ssl->transform_in->cipher_ctx_dec, 01569 dec_msg, dec_msglen, dec_msg_result, 01570 &olen ) ) != 0 ) 01571 { 01572 SSL_DEBUG_RET( 1, "cipher_update", ret ); 01573 return( ret ); 01574 } 01575 01576 dec_msglen -= olen; 01577 if( ( ret = cipher_finish( &ssl->transform_in->cipher_ctx_dec, 01578 dec_msg_result + olen, &olen ) ) != 0 ) 01579 { 01580 SSL_DEBUG_RET( 1, "cipher_finish", ret ); 01581 return( ret ); 01582 } 01583 01584 if( dec_msglen != olen ) 01585 { 01586 SSL_DEBUG_MSG( 1, ( "total encrypted length incorrect" ) ); 01587 return( POLARSSL_ERR_SSL_INTERNAL_ERROR ); 01588 } 01589 01590 #if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) 01591 if( ssl->minor_ver < SSL_MINOR_VERSION_2 ) 01592 { 01593 /* 01594 * Save IV in SSL3 and TLS1 01595 */ 01596 memcpy( ssl->transform_in->iv_dec, 01597 ssl->transform_in->cipher_ctx_dec.iv, 01598 ssl->transform_in->ivlen ); 01599 } 01600 #endif 01601 01602 padlen = 1 + ssl->in_msg[ssl->in_msglen - 1]; 01603 01604 if( ssl->in_msglen < ssl->transform_in->maclen + padlen ) 01605 { 01606 #if defined(POLARSSL_SSL_DEBUG_ALL) 01607 SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)", 01608 ssl->in_msglen, ssl->transform_in->maclen, padlen ) ); 01609 #endif 01610 padlen = 0; 01611 correct = 0; 01612 } 01613 01614 #if defined(POLARSSL_SSL_PROTO_SSL3) 01615 if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) 01616 { 01617 if( padlen > ssl->transform_in->ivlen ) 01618 { 01619 #if defined(POLARSSL_SSL_DEBUG_ALL) 01620 SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, " 01621 "should be no more than %d", 01622 padlen, ssl->transform_in->ivlen ) ); 01623 #endif 01624 correct = 0; 01625 } 01626 } 01627 else 01628 #endif /* POLARSSL_SSL_PROTO_SSL3 */ 01629 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \ 01630 defined(POLARSSL_SSL_PROTO_TLS1_2) 01631 if( ssl->minor_ver > SSL_MINOR_VERSION_0 ) 01632 { 01633 /* 01634 * TLSv1+: always check the padding up to the first failure 01635 * and fake check up to 256 bytes of padding 01636 */ 01637 size_t pad_count = 0, real_count = 1; 01638 size_t padding_idx = ssl->in_msglen - padlen - 1; 01639 01640 /* 01641 * Padding is guaranteed to be incorrect if: 01642 * 1. padlen >= ssl->in_msglen 01643 * 01644 * 2. padding_idx >= SSL_MAX_CONTENT_LEN + 01645 * ssl->transform_in->maclen 01646 * 01647 * In both cases we reset padding_idx to a safe value (0) to 01648 * prevent out-of-buffer reads. 01649 */ 01650 correct &= ( ssl->in_msglen >= padlen + 1 ); 01651 correct &= ( padding_idx < SSL_MAX_CONTENT_LEN + 01652 ssl->transform_in->maclen ); 01653 01654 padding_idx *= correct; 01655 01656 for( i = 1; i <= 256; i++ ) 01657 { 01658 real_count &= ( i <= padlen ); 01659 pad_count += real_count * 01660 ( ssl->in_msg[padding_idx + i] == padlen - 1 ); 01661 } 01662 01663 correct &= ( pad_count == padlen ); /* Only 1 on correct padding */ 01664 01665 #if defined(POLARSSL_SSL_DEBUG_ALL) 01666 if( padlen > 0 && correct == 0) 01667 SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) ); 01668 #endif 01669 padlen &= correct * 0x1FF; 01670 } 01671 else 01672 #endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 || \ 01673 POLARSSL_SSL_PROTO_TLS1_2 */ 01674 { 01675 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 01676 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 01677 } 01678 } 01679 else 01680 #endif /* POLARSSL_CIPHER_MODE_CBC && 01681 ( POLARSSL_AES_C || POLARSSL_CAMELLIA_C ) */ 01682 { 01683 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 01684 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 01685 } 01686 01687 SSL_DEBUG_BUF( 4, "raw buffer after decryption", 01688 ssl->in_msg, ssl->in_msglen ); 01689 01690 /* 01691 * Always compute the MAC (RFC4346, CBCTIME), except for GCM of course 01692 */ 01693 #if defined(POLARSSL_ARC4_C) || defined(POLARSSL_CIPHER_NULL_CIPHER) || \ 01694 ( defined(POLARSSL_CIPHER_MODE_CBC) && \ 01695 ( defined(POLARSSL_AES_C) || defined(POLARSSL_CAMELLIA_C) ) ) 01696 if( ssl->transform_in->cipher_ctx_dec.cipher_info->mode != 01697 POLARSSL_MODE_GCM ) 01698 { 01699 unsigned char tmp[POLARSSL_SSL_MAX_MAC_SIZE]; 01700 01701 ssl->in_msglen -= ( ssl->transform_in->maclen + padlen ); 01702 01703 ssl->in_hdr[3] = (unsigned char)( ssl->in_msglen >> 8 ); 01704 ssl->in_hdr[4] = (unsigned char)( ssl->in_msglen ); 01705 01706 memcpy( tmp, ssl->in_msg + ssl->in_msglen, ssl->transform_in->maclen ); 01707 01708 #if defined(POLARSSL_SSL_PROTO_SSL3) 01709 if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) 01710 { 01711 ssl_mac( &ssl->transform_in->md_ctx_dec, 01712 ssl->transform_in->mac_dec, 01713 ssl->in_msg, ssl->in_msglen, 01714 ssl->in_ctr, ssl->in_msgtype ); 01715 } 01716 else 01717 #endif /* POLARSSL_SSL_PROTO_SSL3 */ 01718 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \ 01719 defined(POLARSSL_SSL_PROTO_TLS1_2) 01720 if( ssl->minor_ver > SSL_MINOR_VERSION_0 ) 01721 { 01722 /* 01723 * Process MAC and always update for padlen afterwards to make 01724 * total time independent of padlen 01725 * 01726 * extra_run compensates MAC check for padlen 01727 * 01728 * Known timing attacks: 01729 * - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf) 01730 * 01731 * We use ( ( Lx + 8 ) / 64 ) to handle 'negative Lx' values 01732 * correctly. (We round down instead of up, so -56 is the correct 01733 * value for our calculations instead of -55) 01734 */ 01735 size_t j, extra_run = 0; 01736 extra_run = ( 13 + ssl->in_msglen + padlen + 8 ) / 64 - 01737 ( 13 + ssl->in_msglen + 8 ) / 64; 01738 01739 extra_run &= correct * 0xFF; 01740 01741 md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_ctr, 13 ); 01742 md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_msg, 01743 ssl->in_msglen ); 01744 md_hmac_finish( &ssl->transform_in->md_ctx_dec, 01745 ssl->in_msg + ssl->in_msglen ); 01746 for( j = 0; j < extra_run; j++ ) 01747 md_process( &ssl->transform_in->md_ctx_dec, ssl->in_msg ); 01748 01749 md_hmac_reset( &ssl->transform_in->md_ctx_dec ); 01750 } 01751 else 01752 #endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 || \ 01753 POLARSSL_SSL_PROTO_TLS1_2 */ 01754 { 01755 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 01756 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 01757 } 01758 01759 SSL_DEBUG_BUF( 4, "message mac", tmp, ssl->transform_in->maclen ); 01760 SSL_DEBUG_BUF( 4, "computed mac", ssl->in_msg + ssl->in_msglen, 01761 ssl->transform_in->maclen ); 01762 01763 if( safer_memcmp( tmp, ssl->in_msg + ssl->in_msglen, 01764 ssl->transform_in->maclen ) != 0 ) 01765 { 01766 #if defined(POLARSSL_SSL_DEBUG_ALL) 01767 SSL_DEBUG_MSG( 1, ( "message mac does not match" ) ); 01768 #endif 01769 correct = 0; 01770 } 01771 01772 /* 01773 * Finally check the correct flag 01774 */ 01775 if( correct == 0 ) 01776 return( POLARSSL_ERR_SSL_INVALID_MAC ); 01777 } 01778 #endif /* GCM not the only option */ 01779 01780 if( ssl->in_msglen == 0 ) 01781 { 01782 ssl->nb_zero++; 01783 01784 /* 01785 * Three or more empty messages may be a DoS attack 01786 * (excessive CPU consumption). 01787 */ 01788 if( ssl->nb_zero > 3 ) 01789 { 01790 SSL_DEBUG_MSG( 1, ( "received four consecutive empty " 01791 "messages, possible DoS attack" ) ); 01792 return( POLARSSL_ERR_SSL_INVALID_MAC ); 01793 } 01794 } 01795 else 01796 ssl->nb_zero = 0; 01797 01798 for( i = 8; i > 0; i-- ) 01799 if( ++ssl->in_ctr[i - 1] != 0 ) 01800 break; 01801 01802 /* The loops goes to its end iff the counter is wrapping */ 01803 if( i == 0 ) 01804 { 01805 SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) ); 01806 return( POLARSSL_ERR_SSL_COUNTER_WRAPPING ); 01807 } 01808 01809 SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) ); 01810 01811 return( 0 ); 01812 } 01813 01814 #if defined(POLARSSL_ZLIB_SUPPORT) 01815 /* 01816 * Compression/decompression functions 01817 */ 01818 static int ssl_compress_buf( ssl_context *ssl ) 01819 { 01820 int ret; 01821 unsigned char *msg_post = ssl->out_msg; 01822 size_t len_pre = ssl->out_msglen; 01823 unsigned char *msg_pre = ssl->compress_buf; 01824 01825 SSL_DEBUG_MSG( 2, ( "=> compress buf" ) ); 01826 01827 if( len_pre == 0 ) 01828 return( 0 ); 01829 01830 memcpy( msg_pre, ssl->out_msg, len_pre ); 01831 01832 SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ", 01833 ssl->out_msglen ) ); 01834 01835 SSL_DEBUG_BUF( 4, "before compression: output payload", 01836 ssl->out_msg, ssl->out_msglen ); 01837 01838 ssl->transform_out->ctx_deflate.next_in = msg_pre; 01839 ssl->transform_out->ctx_deflate.avail_in = len_pre; 01840 ssl->transform_out->ctx_deflate.next_out = msg_post; 01841 ssl->transform_out->ctx_deflate.avail_out = SSL_BUFFER_LEN; 01842 01843 ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH ); 01844 if( ret != Z_OK ) 01845 { 01846 SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) ); 01847 return( POLARSSL_ERR_SSL_COMPRESSION_FAILED ); 01848 } 01849 01850 ssl->out_msglen = SSL_BUFFER_LEN - 01851 ssl->transform_out->ctx_deflate.avail_out; 01852 01853 SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ", 01854 ssl->out_msglen ) ); 01855 01856 SSL_DEBUG_BUF( 4, "after compression: output payload", 01857 ssl->out_msg, ssl->out_msglen ); 01858 01859 SSL_DEBUG_MSG( 2, ( "<= compress buf" ) ); 01860 01861 return( 0 ); 01862 } 01863 01864 static int ssl_decompress_buf( ssl_context *ssl ) 01865 { 01866 int ret; 01867 unsigned char *msg_post = ssl->in_msg; 01868 size_t len_pre = ssl->in_msglen; 01869 unsigned char *msg_pre = ssl->compress_buf; 01870 01871 SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) ); 01872 01873 if( len_pre == 0 ) 01874 return( 0 ); 01875 01876 memcpy( msg_pre, ssl->in_msg, len_pre ); 01877 01878 SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ", 01879 ssl->in_msglen ) ); 01880 01881 SSL_DEBUG_BUF( 4, "before decompression: input payload", 01882 ssl->in_msg, ssl->in_msglen ); 01883 01884 ssl->transform_in->ctx_inflate.next_in = msg_pre; 01885 ssl->transform_in->ctx_inflate.avail_in = len_pre; 01886 ssl->transform_in->ctx_inflate.next_out = msg_post; 01887 ssl->transform_in->ctx_inflate.avail_out = SSL_MAX_CONTENT_LEN; 01888 01889 ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH ); 01890 if( ret != Z_OK ) 01891 { 01892 SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) ); 01893 return( POLARSSL_ERR_SSL_COMPRESSION_FAILED ); 01894 } 01895 01896 ssl->in_msglen = SSL_MAX_CONTENT_LEN - 01897 ssl->transform_in->ctx_inflate.avail_out; 01898 01899 SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ", 01900 ssl->in_msglen ) ); 01901 01902 SSL_DEBUG_BUF( 4, "after decompression: input payload", 01903 ssl->in_msg, ssl->in_msglen ); 01904 01905 SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) ); 01906 01907 return( 0 ); 01908 } 01909 #endif /* POLARSSL_ZLIB_SUPPORT */ 01910 01911 /* 01912 * Fill the input message buffer 01913 */ 01914 int ssl_fetch_input ( ssl_context *ssl, size_t nb_want ) 01915 { 01916 int ret; 01917 size_t len; 01918 01919 SSL_DEBUG_MSG( 2, ( "=> fetch input" ) ); 01920 01921 if( nb_want > SSL_BUFFER_LEN - 8 ) 01922 { 01923 SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) ); 01924 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 01925 } 01926 01927 while( ssl->in_left < nb_want ) 01928 { 01929 len = nb_want - ssl->in_left; 01930 ret = ssl->f_recv( ssl->p_recv, ssl->in_hdr + ssl->in_left, len ); 01931 01932 SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d", 01933 ssl->in_left, nb_want ) ); 01934 SSL_DEBUG_RET( 2, "ssl->f_recv", ret ); 01935 01936 if( ret == 0 ) 01937 return( POLARSSL_ERR_SSL_CONN_EOF ); 01938 01939 if( ret < 0 ) 01940 return( ret ); 01941 01942 ssl->in_left += ret; 01943 } 01944 01945 SSL_DEBUG_MSG( 2, ( "<= fetch input" ) ); 01946 01947 return( 0 ); 01948 } 01949 01950 /* 01951 * Flush any data not yet written 01952 */ 01953 int ssl_flush_output( ssl_context *ssl ) 01954 { 01955 int ret; 01956 unsigned char *buf; 01957 01958 SSL_DEBUG_MSG( 2, ( "=> flush output" ) ); 01959 01960 while( ssl->out_left > 0 ) 01961 { 01962 SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d", 01963 5 + ssl->out_msglen, ssl->out_left ) ); 01964 01965 buf = ssl->out_hdr + 5 + ssl->out_msglen - ssl->out_left; 01966 ret = ssl->f_send( ssl->p_send, buf, ssl->out_left ); 01967 01968 SSL_DEBUG_RET( 2, "ssl->f_send", ret ); 01969 01970 if( ret <= 0 ) 01971 return( ret ); 01972 01973 ssl->out_left -= ret; 01974 } 01975 01976 SSL_DEBUG_MSG( 2, ( "<= flush output" ) ); 01977 01978 return( 0 ); 01979 } 01980 01981 /* 01982 * Record layer functions 01983 */ 01984 int ssl_write_record( ssl_context *ssl ) 01985 { 01986 int ret, done = 0; 01987 size_t len = ssl->out_msglen; 01988 01989 SSL_DEBUG_MSG( 2, ( "=> write record" ) ); 01990 01991 if( ssl->out_msgtype == SSL_MSG_HANDSHAKE ) 01992 { 01993 ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 ); 01994 ssl->out_msg[2] = (unsigned char)( ( len - 4 ) >> 8 ); 01995 ssl->out_msg[3] = (unsigned char)( ( len - 4 ) ); 01996 01997 if( ssl->out_msg[0] != SSL_HS_HELLO_REQUEST ) 01998 ssl->handshake->update_checksum( ssl, ssl->out_msg, len ); 01999 } 02000 02001 #if defined(POLARSSL_ZLIB_SUPPORT) 02002 if( ssl->transform_out != NULL && 02003 ssl->session_out->compression == SSL_COMPRESS_DEFLATE ) 02004 { 02005 if( ( ret = ssl_compress_buf( ssl ) ) != 0 ) 02006 { 02007 SSL_DEBUG_RET( 1, "ssl_compress_buf", ret ); 02008 return( ret ); 02009 } 02010 02011 len = ssl->out_msglen; 02012 } 02013 #endif /*POLARSSL_ZLIB_SUPPORT */ 02014 02015 #if defined(POLARSSL_SSL_HW_RECORD_ACCEL) 02016 if( ssl_hw_record_write != NULL) 02017 { 02018 SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_write()" ) ); 02019 02020 ret = ssl_hw_record_write( ssl ); 02021 if( ret != 0 && ret != POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH ) 02022 { 02023 SSL_DEBUG_RET( 1, "ssl_hw_record_write", ret ); 02024 return POLARSSL_ERR_SSL_HW_ACCEL_FAILED; 02025 } 02026 02027 if( ret == 0 ) 02028 done = 1; 02029 } 02030 #endif /* POLARSSL_SSL_HW_RECORD_ACCEL */ 02031 if( !done ) 02032 { 02033 ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype; 02034 ssl->out_hdr[1] = (unsigned char) ssl->major_ver; 02035 ssl->out_hdr[2] = (unsigned char) ssl->minor_ver; 02036 ssl->out_hdr[3] = (unsigned char)( len >> 8 ); 02037 ssl->out_hdr[4] = (unsigned char)( len ); 02038 02039 if( ssl->transform_out != NULL ) 02040 { 02041 if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 ) 02042 { 02043 SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret ); 02044 return( ret ); 02045 } 02046 02047 len = ssl->out_msglen; 02048 ssl->out_hdr[3] = (unsigned char)( len >> 8 ); 02049 ssl->out_hdr[4] = (unsigned char)( len ); 02050 } 02051 02052 ssl->out_left = 5 + ssl->out_msglen; 02053 02054 SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, " 02055 "version = [%d:%d], msglen = %d", 02056 ssl->out_hdr[0], ssl->out_hdr[1], ssl->out_hdr[2], 02057 ( ssl->out_hdr[3] << 8 ) | ssl->out_hdr[4] ) ); 02058 02059 SSL_DEBUG_BUF( 4, "output record sent to network", 02060 ssl->out_hdr, 5 + ssl->out_msglen ); 02061 } 02062 02063 if( ( ret = ssl_flush_output( ssl ) ) != 0 ) 02064 { 02065 SSL_DEBUG_RET( 1, "ssl_flush_output", ret ); 02066 return( ret ); 02067 } 02068 02069 SSL_DEBUG_MSG( 2, ( "<= write record" ) ); 02070 02071 return( 0 ); 02072 } 02073 02074 int ssl_read_record ( ssl_context *ssl ) 02075 { 02076 int ret, done = 0; 02077 02078 SSL_DEBUG_MSG( 2, ( "=> read record" ) ); 02079 02080 SSL_DEBUG_BUF( 4, "input record from network", 02081 ssl->in_hdr, 5 + ssl->in_msglen ); 02082 02083 if( ssl->in_hslen != 0 && 02084 ssl->in_hslen < ssl->in_msglen ) 02085 { 02086 /* 02087 * Get next Handshake message in the current record 02088 */ 02089 ssl->in_msglen -= ssl->in_hslen; 02090 02091 memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen, 02092 ssl->in_msglen ); 02093 02094 ssl->in_hslen = 4; 02095 ssl->in_hslen += ( ssl->in_msg[2] << 8 ) | ssl->in_msg[3]; 02096 02097 SSL_DEBUG_MSG( 3, ( "handshake message: msglen =" 02098 " %d, type = %d, hslen = %d", 02099 ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) ); 02100 02101 if( ssl->in_msglen < 4 || ssl->in_msg[1] != 0 ) 02102 { 02103 SSL_DEBUG_MSG( 1, ( "bad handshake length" ) ); 02104 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02105 } 02106 02107 if( ssl->in_msglen < ssl->in_hslen ) 02108 { 02109 SSL_DEBUG_MSG( 1, ( "bad handshake length" ) ); 02110 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02111 } 02112 02113 if( ssl->state != SSL_HANDSHAKE_OVER ) 02114 ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen ); 02115 02116 return( 0 ); 02117 } 02118 02119 ssl->in_hslen = 0; 02120 02121 /* 02122 * Read the record header and validate it 02123 */ 02124 if( ( ret = ssl_fetch_input ( ssl, 5 ) ) != 0 ) 02125 { 02126 SSL_DEBUG_RET( 1, "ssl_fetch_input", ret ); 02127 return( ret ); 02128 } 02129 02130 ssl->in_msgtype = ssl->in_hdr[0]; 02131 ssl->in_msglen = ( ssl->in_hdr[3] << 8 ) | ssl->in_hdr[4]; 02132 02133 SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, " 02134 "version = [%d:%d], msglen = %d", 02135 ssl->in_hdr[0], ssl->in_hdr[1], ssl->in_hdr[2], 02136 ( ssl->in_hdr[3] << 8 ) | ssl->in_hdr[4] ) ); 02137 02138 if( ssl->in_hdr[1] != ssl->major_ver ) 02139 { 02140 SSL_DEBUG_MSG( 1, ( "major version mismatch" ) ); 02141 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02142 } 02143 02144 if( ssl->in_hdr[2] > ssl->max_minor_ver ) 02145 { 02146 SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) ); 02147 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02148 } 02149 02150 /* Sanity check (outer boundaries) */ 02151 if( ssl->in_msglen < 1 || ssl->in_msglen > SSL_BUFFER_LEN - 13 ) 02152 { 02153 SSL_DEBUG_MSG( 1, ( "bad message length" ) ); 02154 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02155 } 02156 02157 /* 02158 * Make sure the message length is acceptable for the current transform 02159 * and protocol version. 02160 */ 02161 if( ssl->transform_in == NULL ) 02162 { 02163 if( ssl->in_msglen > SSL_MAX_CONTENT_LEN ) 02164 { 02165 SSL_DEBUG_MSG( 1, ( "bad message length" ) ); 02166 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02167 } 02168 } 02169 else 02170 { 02171 if( ssl->in_msglen < ssl->transform_in->minlen ) 02172 { 02173 SSL_DEBUG_MSG( 1, ( "bad message length" ) ); 02174 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02175 } 02176 02177 #if defined(POLARSSL_SSL_PROTO_SSL3) 02178 if( ssl->minor_ver == SSL_MINOR_VERSION_0 && 02179 ssl->in_msglen > ssl->transform_in->minlen + SSL_MAX_CONTENT_LEN ) 02180 { 02181 SSL_DEBUG_MSG( 1, ( "bad message length" ) ); 02182 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02183 } 02184 #endif 02185 02186 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \ 02187 defined(POLARSSL_SSL_PROTO_TLS1_2) 02188 /* 02189 * TLS encrypted messages can have up to 256 bytes of padding 02190 */ 02191 if( ssl->minor_ver >= SSL_MINOR_VERSION_1 && 02192 ssl->in_msglen > ssl->transform_in->minlen + 02193 SSL_MAX_CONTENT_LEN + 256 ) 02194 { 02195 SSL_DEBUG_MSG( 1, ( "bad message length" ) ); 02196 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02197 } 02198 #endif 02199 } 02200 02201 /* 02202 * Read and optionally decrypt the message contents 02203 */ 02204 if( ( ret = ssl_fetch_input ( ssl, 5 + ssl->in_msglen ) ) != 0 ) 02205 { 02206 SSL_DEBUG_RET( 1, "ssl_fetch_input", ret ); 02207 return( ret ); 02208 } 02209 02210 SSL_DEBUG_BUF( 4, "input record from network", 02211 ssl->in_hdr, 5 + ssl->in_msglen ); 02212 02213 #if defined(POLARSSL_SSL_HW_RECORD_ACCEL) 02214 if( ssl_hw_record_read != NULL) 02215 { 02216 SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_read()" ) ); 02217 02218 ret = ssl_hw_record_read( ssl ); 02219 if( ret != 0 && ret != POLARSSL_ERR_SSL_HW_ACCEL_FALLTHROUGH ) 02220 { 02221 SSL_DEBUG_RET( 1, "ssl_hw_record_read", ret ); 02222 return POLARSSL_ERR_SSL_HW_ACCEL_FAILED; 02223 } 02224 02225 if( ret == 0 ) 02226 done = 1; 02227 } 02228 #endif /* POLARSSL_SSL_HW_RECORD_ACCEL */ 02229 if( !done && ssl->transform_in != NULL ) 02230 { 02231 if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 ) 02232 { 02233 #if defined(POLARSSL_SSL_ALERT_MESSAGES) 02234 if( ret == POLARSSL_ERR_SSL_INVALID_MAC ) 02235 { 02236 ssl_send_alert_message( ssl, 02237 SSL_ALERT_LEVEL_FATAL, 02238 SSL_ALERT_MSG_BAD_RECORD_MAC ); 02239 } 02240 #endif 02241 SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret ); 02242 return( ret ); 02243 } 02244 02245 SSL_DEBUG_BUF( 4, "input payload after decrypt", 02246 ssl->in_msg, ssl->in_msglen ); 02247 02248 if( ssl->in_msglen > SSL_MAX_CONTENT_LEN ) 02249 { 02250 SSL_DEBUG_MSG( 1, ( "bad message length" ) ); 02251 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02252 } 02253 } 02254 02255 #if defined(POLARSSL_ZLIB_SUPPORT) 02256 if( ssl->transform_in != NULL && 02257 ssl->session_in->compression == SSL_COMPRESS_DEFLATE ) 02258 { 02259 if( ( ret = ssl_decompress_buf( ssl ) ) != 0 ) 02260 { 02261 SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret ); 02262 return( ret ); 02263 } 02264 02265 ssl->in_hdr[3] = (unsigned char)( ssl->in_msglen >> 8 ); 02266 ssl->in_hdr[4] = (unsigned char)( ssl->in_msglen ); 02267 } 02268 #endif /* POLARSSL_ZLIB_SUPPORT */ 02269 02270 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE && 02271 ssl->in_msgtype != SSL_MSG_ALERT && 02272 ssl->in_msgtype != SSL_MSG_CHANGE_CIPHER_SPEC && 02273 ssl->in_msgtype != SSL_MSG_APPLICATION_DATA ) 02274 { 02275 SSL_DEBUG_MSG( 1, ( "unknown record type" ) ); 02276 02277 if( ( ret = ssl_send_alert_message( ssl, 02278 SSL_ALERT_LEVEL_FATAL, 02279 SSL_ALERT_MSG_UNEXPECTED_MESSAGE ) ) != 0 ) 02280 { 02281 return( ret ); 02282 } 02283 02284 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02285 } 02286 02287 if( ssl->in_msgtype == SSL_MSG_HANDSHAKE ) 02288 { 02289 ssl->in_hslen = 4; 02290 ssl->in_hslen += ( ssl->in_msg[2] << 8 ) | ssl->in_msg[3]; 02291 02292 SSL_DEBUG_MSG( 3, ( "handshake message: msglen =" 02293 " %d, type = %d, hslen = %d", 02294 ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) ); 02295 02296 /* 02297 * Additional checks to validate the handshake header 02298 */ 02299 if( ssl->in_msglen < 4 || ssl->in_msg[1] != 0 ) 02300 { 02301 SSL_DEBUG_MSG( 1, ( "bad handshake length" ) ); 02302 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02303 } 02304 02305 if( ssl->in_msglen < ssl->in_hslen ) 02306 { 02307 SSL_DEBUG_MSG( 1, ( "bad handshake length" ) ); 02308 return( POLARSSL_ERR_SSL_INVALID_RECORD ); 02309 } 02310 02311 if( ssl->state != SSL_HANDSHAKE_OVER ) 02312 ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen ); 02313 } 02314 02315 if( ssl->in_msgtype == SSL_MSG_ALERT ) 02316 { 02317 SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]", 02318 ssl->in_msg[0], ssl->in_msg[1] ) ); 02319 02320 /* 02321 * Ignore non-fatal alerts, except close_notify 02322 */ 02323 if( ssl->in_msg[0] == SSL_ALERT_LEVEL_FATAL ) 02324 { 02325 SSL_DEBUG_MSG( 1, ( "is a fatal alert message (msg %d)", 02326 ssl->in_msg[1] ) ); 02327 /** 02328 * Subtract from error code as ssl->in_msg[1] is 7-bit positive 02329 * error identifier. 02330 */ 02331 return( POLARSSL_ERR_SSL_FATAL_ALERT_MESSAGE ); 02332 } 02333 02334 if( ssl->in_msg[0] == SSL_ALERT_LEVEL_WARNING && 02335 ssl->in_msg[1] == SSL_ALERT_MSG_CLOSE_NOTIFY ) 02336 { 02337 SSL_DEBUG_MSG( 2, ( "is a close notify message" ) ); 02338 return( POLARSSL_ERR_SSL_PEER_CLOSE_NOTIFY ); 02339 } 02340 } 02341 02342 ssl->in_left = 0; 02343 02344 SSL_DEBUG_MSG( 2, ( "<= read record" ) ); 02345 02346 return( 0 ); 02347 } 02348 02349 int ssl_send_fatal_handshake_failure( ssl_context *ssl ) 02350 { 02351 int ret; 02352 02353 if( ( ret = ssl_send_alert_message( ssl, 02354 SSL_ALERT_LEVEL_FATAL, 02355 SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ) != 0 ) 02356 { 02357 return( ret ); 02358 } 02359 02360 return( 0 ); 02361 } 02362 02363 int ssl_send_alert_message( ssl_context *ssl, 02364 unsigned char level, 02365 unsigned char message ) 02366 { 02367 int ret; 02368 02369 SSL_DEBUG_MSG( 2, ( "=> send alert message" ) ); 02370 02371 ssl->out_msgtype = SSL_MSG_ALERT; 02372 ssl->out_msglen = 2; 02373 ssl->out_msg[0] = level; 02374 ssl->out_msg[1] = message; 02375 02376 if( ( ret = ssl_write_record( ssl ) ) != 0 ) 02377 { 02378 SSL_DEBUG_RET( 1, "ssl_write_record", ret ); 02379 return( ret ); 02380 } 02381 02382 SSL_DEBUG_MSG( 2, ( "<= send alert message" ) ); 02383 02384 return( 0 ); 02385 } 02386 02387 /* 02388 * Handshake functions 02389 */ 02390 #if !defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED) && \ 02391 !defined(POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED) && \ 02392 !defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED) && \ 02393 !defined(POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \ 02394 !defined(POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) && \ 02395 !defined(POLARSSL_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \ 02396 !defined(POLARSSL_KEY_EXCHANGE_ECDH_ECDSA_ENABLED) 02397 int ssl_write_certificate( ssl_context *ssl ) 02398 { 02399 int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; 02400 const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; 02401 02402 SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); 02403 02404 if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK || 02405 ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK || 02406 ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK ) 02407 { 02408 SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); 02409 ssl->state++; 02410 return( 0 ); 02411 } 02412 02413 SSL_DEBUG_MSG( 1, ( "should not happen" ) ); 02414 return( ret ); 02415 } 02416 02417 int ssl_parse_certificate( ssl_context *ssl ) 02418 { 02419 int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; 02420 const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; 02421 02422 SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); 02423 02424 if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK || 02425 ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK || 02426 ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK ) 02427 { 02428 SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); 02429 ssl->state++; 02430 return( 0 ); 02431 } 02432 02433 SSL_DEBUG_MSG( 1, ( "should not happen" ) ); 02434 return( ret ); 02435 } 02436 #else 02437 int ssl_write_certificate( ssl_context *ssl ) 02438 { 02439 int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; 02440 size_t i, n; 02441 const x509_crt *crt; 02442 const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; 02443 02444 SSL_DEBUG_MSG( 2, ( "=> write certificate" ) ); 02445 02446 if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK || 02447 ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK || 02448 ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK ) 02449 { 02450 SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); 02451 ssl->state++; 02452 return( 0 ); 02453 } 02454 02455 if( ssl->endpoint == SSL_IS_CLIENT ) 02456 { 02457 if( ssl->client_auth == 0 ) 02458 { 02459 SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) ); 02460 ssl->state++; 02461 return( 0 ); 02462 } 02463 02464 #if defined(POLARSSL_SSL_PROTO_SSL3) 02465 /* 02466 * If using SSLv3 and got no cert, send an Alert message 02467 * (otherwise an empty Certificate message will be sent). 02468 */ 02469 if( ssl_own_cert( ssl ) == NULL && 02470 ssl->minor_ver == SSL_MINOR_VERSION_0 ) 02471 { 02472 ssl->out_msglen = 2; 02473 ssl->out_msgtype = SSL_MSG_ALERT; 02474 ssl->out_msg[0] = SSL_ALERT_LEVEL_WARNING; 02475 ssl->out_msg[1] = SSL_ALERT_MSG_NO_CERT; 02476 02477 SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) ); 02478 goto write_msg; 02479 } 02480 #endif /* POLARSSL_SSL_PROTO_SSL3 */ 02481 } 02482 else /* SSL_IS_SERVER */ 02483 { 02484 if( ssl_own_cert( ssl ) == NULL ) 02485 { 02486 SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) ); 02487 return( POLARSSL_ERR_SSL_CERTIFICATE_REQUIRED ); 02488 } 02489 } 02490 02491 SSL_DEBUG_CRT( 3, "own certificate", ssl_own_cert( ssl ) ); 02492 02493 /* 02494 * 0 . 0 handshake type 02495 * 1 . 3 handshake length 02496 * 4 . 6 length of all certs 02497 * 7 . 9 length of cert. 1 02498 * 10 . n-1 peer certificate 02499 * n . n+2 length of cert. 2 02500 * n+3 . ... upper level cert, etc. 02501 */ 02502 i = 7; 02503 crt = ssl_own_cert( ssl ); 02504 02505 while( crt != NULL ) 02506 { 02507 n = crt->raw.len; 02508 if( n > SSL_MAX_CONTENT_LEN - 3 - i ) 02509 { 02510 SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d", 02511 i + 3 + n, SSL_MAX_CONTENT_LEN ) ); 02512 return( POLARSSL_ERR_SSL_CERTIFICATE_TOO_LARGE ); 02513 } 02514 02515 ssl->out_msg[i ] = (unsigned char)( n >> 16 ); 02516 ssl->out_msg[i + 1] = (unsigned char)( n >> 8 ); 02517 ssl->out_msg[i + 2] = (unsigned char)( n ); 02518 02519 i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n ); 02520 i += n; crt = crt->next; 02521 } 02522 02523 ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 ); 02524 ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 ); 02525 ssl->out_msg[6] = (unsigned char)( ( i - 7 ) ); 02526 02527 ssl->out_msglen = i; 02528 ssl->out_msgtype = SSL_MSG_HANDSHAKE; 02529 ssl->out_msg[0] = SSL_HS_CERTIFICATE; 02530 02531 #if defined(POLARSSL_SSL_PROTO_SSL3) 02532 write_msg: 02533 #endif 02534 02535 ssl->state++; 02536 02537 if( ( ret = ssl_write_record( ssl ) ) != 0 ) 02538 { 02539 SSL_DEBUG_RET( 1, "ssl_write_record", ret ); 02540 return( ret ); 02541 } 02542 02543 SSL_DEBUG_MSG( 2, ( "<= write certificate" ) ); 02544 02545 return( ret ); 02546 } 02547 02548 int ssl_parse_certificate( ssl_context *ssl ) 02549 { 02550 int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; 02551 size_t i, n; 02552 const ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info; 02553 02554 SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) ); 02555 02556 if( ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_PSK || 02557 ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_DHE_PSK || 02558 ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_ECDHE_PSK ) 02559 { 02560 SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); 02561 ssl->state++; 02562 return( 0 ); 02563 } 02564 02565 if( ssl->endpoint == SSL_IS_SERVER && 02566 ( ssl->authmode == SSL_VERIFY_NONE || 02567 ciphersuite_info->key_exchange == POLARSSL_KEY_EXCHANGE_RSA_PSK ) ) 02568 { 02569 ssl->session_negotiate->verify_result = BADCERT_SKIP_VERIFY; 02570 SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) ); 02571 ssl->state++; 02572 return( 0 ); 02573 } 02574 02575 if( ( ret = ssl_read_record ( ssl ) ) != 0 ) 02576 { 02577 SSL_DEBUG_RET( 1, "ssl_read_record", ret ); 02578 return( ret ); 02579 } 02580 02581 ssl->state++; 02582 02583 #if defined(POLARSSL_SSL_PROTO_SSL3) 02584 /* 02585 * Check if the client sent an empty certificate 02586 */ 02587 if( ssl->endpoint == SSL_IS_SERVER && 02588 ssl->minor_ver == SSL_MINOR_VERSION_0 ) 02589 { 02590 if( ssl->in_msglen == 2 && 02591 ssl->in_msgtype == SSL_MSG_ALERT && 02592 ssl->in_msg[0] == SSL_ALERT_LEVEL_WARNING && 02593 ssl->in_msg[1] == SSL_ALERT_MSG_NO_CERT ) 02594 { 02595 SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) ); 02596 02597 ssl->session_negotiate->verify_result = BADCERT_MISSING; 02598 if( ssl->authmode == SSL_VERIFY_OPTIONAL ) 02599 return( 0 ); 02600 else 02601 return( POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE ); 02602 } 02603 } 02604 #endif /* POLARSSL_SSL_PROTO_SSL3 */ 02605 02606 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \ 02607 defined(POLARSSL_SSL_PROTO_TLS1_2) 02608 if( ssl->endpoint == SSL_IS_SERVER && 02609 ssl->minor_ver != SSL_MINOR_VERSION_0 ) 02610 { 02611 if( ssl->in_hslen == 7 && 02612 ssl->in_msgtype == SSL_MSG_HANDSHAKE && 02613 ssl->in_msg[0] == SSL_HS_CERTIFICATE && 02614 memcmp( ssl->in_msg + 4, "\0\0\0", 3 ) == 0 ) 02615 { 02616 SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) ); 02617 02618 ssl->session_negotiate->verify_result = BADCERT_MISSING; 02619 if( ssl->authmode == SSL_VERIFY_REQUIRED ) 02620 return( POLARSSL_ERR_SSL_NO_CLIENT_CERTIFICATE ); 02621 else 02622 return( 0 ); 02623 } 02624 } 02625 #endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 || \ 02626 POLARSSL_SSL_PROTO_TLS1_2 */ 02627 02628 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) 02629 { 02630 SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); 02631 return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); 02632 } 02633 02634 if( ssl->in_msg[0] != SSL_HS_CERTIFICATE || ssl->in_hslen < 10 ) 02635 { 02636 SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); 02637 return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE ); 02638 } 02639 02640 /* 02641 * Same message structure as in ssl_write_certificate() 02642 */ 02643 n = ( ssl->in_msg[5] << 8 ) | ssl->in_msg[6]; 02644 02645 if( ssl->in_msg[4] != 0 || ssl->in_hslen != 7 + n ) 02646 { 02647 SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); 02648 return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE ); 02649 } 02650 02651 /* In case we tried to reuse a session but it failed */ 02652 if( ssl->session_negotiate->peer_cert != NULL ) 02653 { 02654 x509_crt_free( ssl->session_negotiate->peer_cert ); 02655 polarssl_free( ssl->session_negotiate->peer_cert ); 02656 } 02657 02658 if( ( ssl->session_negotiate->peer_cert = (x509_crt *) polarssl_malloc( 02659 sizeof( x509_crt ) ) ) == NULL ) 02660 { 02661 SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", 02662 sizeof( x509_crt ) ) ); 02663 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 02664 } 02665 02666 x509_crt_init( ssl->session_negotiate->peer_cert ); 02667 02668 i = 7; 02669 02670 while( i < ssl->in_hslen ) 02671 { 02672 if( ssl->in_msg[i] != 0 ) 02673 { 02674 SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); 02675 return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE ); 02676 } 02677 02678 n = ( (unsigned int) ssl->in_msg[i + 1] << 8 ) 02679 | (unsigned int) ssl->in_msg[i + 2]; 02680 i += 3; 02681 02682 if( n < 128 || i + n > ssl->in_hslen ) 02683 { 02684 SSL_DEBUG_MSG( 1, ( "bad certificate message" ) ); 02685 return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE ); 02686 } 02687 02688 ret = x509_crt_parse_der( ssl->session_negotiate->peer_cert, 02689 ssl->in_msg + i, n ); 02690 if( ret != 0 ) 02691 { 02692 SSL_DEBUG_RET( 1, " x509_crt_parse_der", ret ); 02693 return( ret ); 02694 } 02695 02696 i += n; 02697 } 02698 02699 SSL_DEBUG_CRT( 3, "peer certificate", ssl->session_negotiate->peer_cert ); 02700 02701 /* 02702 * On client, make sure the server cert doesn't change during renego to 02703 * avoid "triple handshake" attack: https://secure-resumption.com/ 02704 */ 02705 if( ssl->endpoint == SSL_IS_CLIENT && 02706 ssl->renegotiation == SSL_RENEGOTIATION ) 02707 { 02708 if( ssl->session->peer_cert == NULL ) 02709 { 02710 SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) ); 02711 return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE ); 02712 } 02713 02714 if( ssl->session->peer_cert->raw.len != 02715 ssl->session_negotiate->peer_cert->raw.len || 02716 memcmp( ssl->session->peer_cert->raw.p, 02717 ssl->session_negotiate->peer_cert->raw.p, 02718 ssl->session->peer_cert->raw.len ) != 0 ) 02719 { 02720 SSL_DEBUG_MSG( 1, ( "server cert changed during renegotiation" ) ); 02721 return( POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE ); 02722 } 02723 } 02724 02725 if( ssl->authmode != SSL_VERIFY_NONE ) 02726 { 02727 if( ssl->ca_chain == NULL ) 02728 { 02729 SSL_DEBUG_MSG( 1, ( "got no CA chain" ) ); 02730 return( POLARSSL_ERR_SSL_CA_CHAIN_REQUIRED ); 02731 } 02732 02733 /* 02734 * Main check: verify certificate 02735 */ 02736 ret = x509_crt_verify( ssl->session_negotiate->peer_cert, 02737 ssl->ca_chain, ssl->ca_crl, ssl->peer_cn, 02738 &ssl->session_negotiate->verify_result, 02739 ssl->f_vrfy, ssl->p_vrfy ); 02740 02741 if( ret != 0 ) 02742 { 02743 SSL_DEBUG_RET( 1, "x509_verify_cert", ret ); 02744 } 02745 02746 /* 02747 * Secondary checks: always done, but change 'ret' only if it was 0 02748 */ 02749 02750 #if defined(POLARSSL_SSL_SET_CURVES) 02751 { 02752 pk_context *pk = &ssl->session_negotiate->peer_cert->pk; 02753 02754 /* If certificate uses an EC key, make sure the curve is OK */ 02755 if( pk_can_do( pk, POLARSSL_PK_ECKEY ) && 02756 ! ssl_curve_is_acceptable( ssl, pk_ec( *pk )->grp.id ) ) 02757 { 02758 SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) ); 02759 if( ret == 0 ) 02760 ret = POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE; 02761 } 02762 } 02763 #endif /* POLARSSL_SSL_SET_CURVES */ 02764 02765 if( ssl_check_cert_usage( ssl->session_negotiate->peer_cert, 02766 ciphersuite_info, 02767 ! ssl->endpoint ) != 0 ) 02768 { 02769 SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) ); 02770 if( ret == 0 ) 02771 ret = POLARSSL_ERR_SSL_BAD_HS_CERTIFICATE; 02772 } 02773 02774 if( ssl->authmode != SSL_VERIFY_REQUIRED ) 02775 ret = 0; 02776 } 02777 02778 SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) ); 02779 02780 return( ret ); 02781 } 02782 #endif /* !POLARSSL_KEY_EXCHANGE_RSA_ENABLED 02783 !POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED 02784 !POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED 02785 !POLARSSL_KEY_EXCHANGE_ECDHE_RSA_ENABLED 02786 !POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED 02787 !POLARSSL_KEY_EXCHANGE_ECDH_RSA_ENABLED 02788 !POLARSSL_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */ 02789 02790 int ssl_write_change_cipher_spec( ssl_context *ssl ) 02791 { 02792 int ret; 02793 02794 SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) ); 02795 02796 ssl->out_msgtype = SSL_MSG_CHANGE_CIPHER_SPEC; 02797 ssl->out_msglen = 1; 02798 ssl->out_msg[0] = 1; 02799 02800 ssl->state++; 02801 02802 if( ( ret = ssl_write_record( ssl ) ) != 0 ) 02803 { 02804 SSL_DEBUG_RET( 1, "ssl_write_record", ret ); 02805 return( ret ); 02806 } 02807 02808 SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) ); 02809 02810 return( 0 ); 02811 } 02812 02813 int ssl_parse_change_cipher_spec( ssl_context *ssl ) 02814 { 02815 int ret; 02816 02817 SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) ); 02818 02819 if( ( ret = ssl_read_record ( ssl ) ) != 0 ) 02820 { 02821 SSL_DEBUG_RET( 1, "ssl_read_record", ret ); 02822 return( ret ); 02823 } 02824 02825 if( ssl->in_msgtype != SSL_MSG_CHANGE_CIPHER_SPEC ) 02826 { 02827 SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) ); 02828 return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); 02829 } 02830 02831 if( ssl->in_msglen != 1 || ssl->in_msg[0] != 1 ) 02832 { 02833 SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) ); 02834 return( POLARSSL_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC ); 02835 } 02836 02837 ssl->state++; 02838 02839 SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) ); 02840 02841 return( 0 ); 02842 } 02843 02844 void ssl_optimize_checksum( ssl_context *ssl, 02845 const ssl_ciphersuite_t *ciphersuite_info ) 02846 { 02847 ((void) ciphersuite_info); 02848 02849 #if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \ 02850 defined(POLARSSL_SSL_PROTO_TLS1_1) 02851 if( ssl->minor_ver < SSL_MINOR_VERSION_3 ) 02852 ssl->handshake->update_checksum = ssl_update_checksum_md5sha1; 02853 else 02854 #endif 02855 #if defined(POLARSSL_SSL_PROTO_TLS1_2) 02856 #if defined(POLARSSL_SHA512_C) 02857 if( ciphersuite_info->mac == POLARSSL_MD_SHA384 ) 02858 ssl->handshake->update_checksum = ssl_update_checksum_sha384; 02859 else 02860 #endif 02861 #if defined(POLARSSL_SHA256_C) 02862 if( ciphersuite_info->mac != POLARSSL_MD_SHA384 ) 02863 ssl->handshake->update_checksum = ssl_update_checksum_sha256; 02864 else 02865 #endif 02866 #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ 02867 /* Should never happen */ 02868 return; 02869 } 02870 02871 static void ssl_update_checksum_start( ssl_context *ssl, 02872 const unsigned char *buf, size_t len ) 02873 { 02874 #if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \ 02875 defined(POLARSSL_SSL_PROTO_TLS1_1) 02876 md5_update( &ssl->handshake->fin_md5 , buf, len ); 02877 sha1_update( &ssl->handshake->fin_sha1, buf, len ); 02878 #endif 02879 #if defined(POLARSSL_SSL_PROTO_TLS1_2) 02880 #if defined(POLARSSL_SHA256_C) 02881 sha256_update( &ssl->handshake->fin_sha256, buf, len ); 02882 #endif 02883 #if defined(POLARSSL_SHA512_C) 02884 sha512_update( &ssl->handshake->fin_sha512, buf, len ); 02885 #endif 02886 #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ 02887 } 02888 02889 #if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \ 02890 defined(POLARSSL_SSL_PROTO_TLS1_1) 02891 static void ssl_update_checksum_md5sha1( ssl_context *ssl, 02892 const unsigned char *buf, size_t len ) 02893 { 02894 md5_update( &ssl->handshake->fin_md5 , buf, len ); 02895 sha1_update( &ssl->handshake->fin_sha1, buf, len ); 02896 } 02897 #endif 02898 02899 #if defined(POLARSSL_SSL_PROTO_TLS1_2) 02900 #if defined(POLARSSL_SHA256_C) 02901 static void ssl_update_checksum_sha256( ssl_context *ssl, 02902 const unsigned char *buf, size_t len ) 02903 { 02904 sha256_update( &ssl->handshake->fin_sha256, buf, len ); 02905 } 02906 #endif 02907 02908 #if defined(POLARSSL_SHA512_C) 02909 static void ssl_update_checksum_sha384( ssl_context *ssl, 02910 const unsigned char *buf, size_t len ) 02911 { 02912 sha512_update( &ssl->handshake->fin_sha512, buf, len ); 02913 } 02914 #endif 02915 #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ 02916 02917 #if defined(POLARSSL_SSL_PROTO_SSL3) 02918 static void ssl_calc_finished_ssl( 02919 ssl_context *ssl, unsigned char *buf, int from ) 02920 { 02921 const char *sender; 02922 md5_context md5; 02923 sha1_context sha1; 02924 02925 unsigned char padbuf[48]; 02926 unsigned char md5sum[16]; 02927 unsigned char sha1sum[20]; 02928 02929 ssl_session *session = ssl->session_negotiate; 02930 if( !session ) 02931 session = ssl->session; 02932 02933 SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) ); 02934 02935 memcpy( &md5 , &ssl->handshake->fin_md5 , sizeof(md5_context) ); 02936 memcpy( &sha1, &ssl->handshake->fin_sha1, sizeof(sha1_context) ); 02937 02938 /* 02939 * SSLv3: 02940 * hash = 02941 * MD5( master + pad2 + 02942 * MD5( handshake + sender + master + pad1 ) ) 02943 * + SHA1( master + pad2 + 02944 * SHA1( handshake + sender + master + pad1 ) ) 02945 */ 02946 02947 #if !defined(POLARSSL_MD5_ALT) 02948 SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) 02949 md5.state , sizeof( md5.state ) ); 02950 #endif 02951 02952 #if !defined(POLARSSL_SHA1_ALT) 02953 SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) 02954 sha1.state , sizeof( sha1.state ) ); 02955 #endif 02956 02957 sender = ( from == SSL_IS_CLIENT ) ? "CLNT" 02958 : "SRVR"; 02959 02960 memset( padbuf, 0x36, 48 ); 02961 02962 md5_update( &md5, (const unsigned char *) sender, 4 ); 02963 md5_update( &md5, session->master, 48 ); 02964 md5_update( &md5, padbuf, 48 ); 02965 md5_finish( &md5, md5sum ); 02966 02967 sha1_update( &sha1, (const unsigned char *) sender, 4 ); 02968 sha1_update( &sha1, session->master, 48 ); 02969 sha1_update( &sha1, padbuf, 40 ); 02970 sha1_finish( &sha1, sha1sum ); 02971 02972 memset( padbuf, 0x5C, 48 ); 02973 02974 md5_starts( &md5 ); 02975 md5_update( &md5, session->master, 48 ); 02976 md5_update( &md5, padbuf, 48 ); 02977 md5_update( &md5, md5sum, 16 ); 02978 md5_finish( &md5, buf ); 02979 02980 sha1_starts( &sha1 ); 02981 sha1_update( &sha1, session->master, 48 ); 02982 sha1_update( &sha1, padbuf , 40 ); 02983 sha1_update( &sha1, sha1sum, 20 ); 02984 sha1_finish( &sha1, buf + 16 ); 02985 02986 SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 ); 02987 02988 memset( &md5, 0, sizeof( md5_context ) ); 02989 memset( &sha1, 0, sizeof( sha1_context ) ); 02990 02991 memset( padbuf, 0, sizeof( padbuf ) ); 02992 memset( md5sum, 0, sizeof( md5sum ) ); 02993 memset( sha1sum, 0, sizeof( sha1sum ) ); 02994 02995 SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); 02996 } 02997 #endif /* POLARSSL_SSL_PROTO_SSL3 */ 02998 02999 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) 03000 static void ssl_calc_finished_tls( 03001 ssl_context *ssl, unsigned char *buf, int from ) 03002 { 03003 int len = 12; 03004 const char *sender; 03005 md5_context md5; 03006 sha1_context sha1; 03007 unsigned char padbuf[36]; 03008 03009 ssl_session *session = ssl->session_negotiate; 03010 if( !session ) 03011 session = ssl->session; 03012 03013 SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) ); 03014 03015 memcpy( &md5 , &ssl->handshake->fin_md5 , sizeof(md5_context) ); 03016 memcpy( &sha1, &ssl->handshake->fin_sha1, sizeof(sha1_context) ); 03017 03018 /* 03019 * TLSv1: 03020 * hash = PRF( master, finished_label, 03021 * MD5( handshake ) + SHA1( handshake ) )[0..11] 03022 */ 03023 03024 #if !defined(POLARSSL_MD5_ALT) 03025 SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *) 03026 md5.state , sizeof( md5.state ) ); 03027 #endif 03028 03029 #if !defined(POLARSSL_SHA1_ALT) 03030 SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *) 03031 sha1.state , sizeof( sha1.state ) ); 03032 #endif 03033 03034 sender = ( from == SSL_IS_CLIENT ) 03035 ? "client finished" 03036 : "server finished"; 03037 03038 md5_finish( &md5, padbuf ); 03039 sha1_finish( &sha1, padbuf + 16 ); 03040 03041 ssl->handshake->tls_prf( session->master, 48, sender, 03042 padbuf, 36, buf, len ); 03043 03044 SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); 03045 03046 memset( &md5, 0, sizeof( md5_context ) ); 03047 memset( &sha1, 0, sizeof( sha1_context ) ); 03048 03049 memset( padbuf, 0, sizeof( padbuf ) ); 03050 03051 SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); 03052 } 03053 #endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 */ 03054 03055 #if defined(POLARSSL_SSL_PROTO_TLS1_2) 03056 #if defined(POLARSSL_SHA256_C) 03057 static void ssl_calc_finished_tls_sha256( 03058 ssl_context *ssl, unsigned char *buf, int from ) 03059 { 03060 int len = 12; 03061 const char *sender; 03062 sha256_context sha256; 03063 unsigned char padbuf[32]; 03064 03065 ssl_session *session = ssl->session_negotiate; 03066 if( !session ) 03067 session = ssl->session; 03068 03069 SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) ); 03070 03071 memcpy( &sha256, &ssl->handshake->fin_sha256, sizeof(sha256_context) ); 03072 03073 /* 03074 * TLSv1.2: 03075 * hash = PRF( master, finished_label, 03076 * Hash( handshake ) )[0.11] 03077 */ 03078 03079 #if !defined(POLARSSL_SHA256_ALT) 03080 SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *) 03081 sha256.state , sizeof( sha256.state ) ); 03082 #endif 03083 03084 sender = ( from == SSL_IS_CLIENT ) 03085 ? "client finished" 03086 : "server finished"; 03087 03088 sha256_finish( &sha256, padbuf ); 03089 03090 ssl->handshake->tls_prf( session->master, 48, sender, 03091 padbuf, 32, buf, len ); 03092 03093 SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); 03094 03095 memset( &sha256, 0, sizeof( sha256_context ) ); 03096 03097 memset( padbuf, 0, sizeof( padbuf ) ); 03098 03099 SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); 03100 } 03101 #endif /* POLARSSL_SHA256_C */ 03102 03103 #if defined(POLARSSL_SHA512_C) 03104 static void ssl_calc_finished_tls_sha384( 03105 ssl_context *ssl, unsigned char *buf, int from ) 03106 { 03107 int len = 12; 03108 const char *sender; 03109 sha512_context sha512; 03110 unsigned char padbuf[48]; 03111 03112 ssl_session *session = ssl->session_negotiate; 03113 if( !session ) 03114 session = ssl->session; 03115 03116 SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) ); 03117 03118 memcpy( &sha512, &ssl->handshake->fin_sha512, sizeof(sha512_context) ); 03119 03120 /* 03121 * TLSv1.2: 03122 * hash = PRF( master, finished_label, 03123 * Hash( handshake ) )[0.11] 03124 */ 03125 03126 #if !defined(POLARSSL_SHA512_ALT) 03127 SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *) 03128 sha512.state , sizeof( sha512.state ) ); 03129 #endif 03130 03131 sender = ( from == SSL_IS_CLIENT ) 03132 ? "client finished" 03133 : "server finished"; 03134 03135 sha512_finish( &sha512, padbuf ); 03136 03137 ssl->handshake->tls_prf( session->master, 48, sender, 03138 padbuf, 48, buf, len ); 03139 03140 SSL_DEBUG_BUF( 3, "calc finished result", buf, len ); 03141 03142 memset( &sha512, 0, sizeof( sha512_context ) ); 03143 03144 memset( padbuf, 0, sizeof( padbuf ) ); 03145 03146 SSL_DEBUG_MSG( 2, ( "<= calc finished" ) ); 03147 } 03148 #endif /* POLARSSL_SHA512_C */ 03149 #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ 03150 03151 void ssl_handshake_wrapup( ssl_context *ssl ) 03152 { 03153 int resume = ssl->handshake->resume; 03154 03155 SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) ); 03156 03157 /* 03158 * Free our handshake params 03159 */ 03160 ssl_handshake_free( ssl->handshake ); 03161 polarssl_free( ssl->handshake ); 03162 ssl->handshake = NULL; 03163 03164 if( ssl->renegotiation == SSL_RENEGOTIATION ) 03165 ssl->renegotiation = SSL_RENEGOTIATION_DONE; 03166 03167 /* 03168 * Switch in our now active transform context 03169 */ 03170 if( ssl->transform ) 03171 { 03172 ssl_transform_free( ssl->transform ); 03173 polarssl_free( ssl->transform ); 03174 } 03175 ssl->transform = ssl->transform_negotiate; 03176 ssl->transform_negotiate = NULL; 03177 03178 if( ssl->session ) 03179 { 03180 ssl_session_free( ssl->session ); 03181 polarssl_free( ssl->session ); 03182 } 03183 ssl->session = ssl->session_negotiate; 03184 ssl->session_negotiate = NULL; 03185 03186 /* 03187 * Add cache entry 03188 */ 03189 if( ssl->f_set_cache != NULL && 03190 ssl->session->length != 0 && 03191 resume == 0 ) 03192 { 03193 if( ssl->f_set_cache( ssl->p_set_cache, ssl->session ) != 0 ) 03194 SSL_DEBUG_MSG( 1, ( "cache did not store session" ) ); 03195 } 03196 03197 ssl->state++; 03198 03199 SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) ); 03200 } 03201 03202 int ssl_write_finished( ssl_context *ssl ) 03203 { 03204 int ret, hash_len; 03205 03206 SSL_DEBUG_MSG( 2, ( "=> write finished" ) ); 03207 03208 /* 03209 * Set the out_msg pointer to the correct location based on IV length 03210 */ 03211 if( ssl->minor_ver >= SSL_MINOR_VERSION_2 ) 03212 { 03213 ssl->out_msg = ssl->out_iv + ssl->transform_negotiate->ivlen - 03214 ssl->transform_negotiate->fixed_ivlen; 03215 } 03216 else 03217 ssl->out_msg = ssl->out_iv; 03218 03219 ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->endpoint ); 03220 03221 // TODO TLS/1.2 Hash length is determined by cipher suite (Page 63) 03222 hash_len = ( ssl->minor_ver == SSL_MINOR_VERSION_0 ) ? 36 : 12; 03223 03224 ssl->verify_data_len = hash_len; 03225 memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len ); 03226 03227 ssl->out_msglen = 4 + hash_len; 03228 ssl->out_msgtype = SSL_MSG_HANDSHAKE; 03229 ssl->out_msg[0] = SSL_HS_FINISHED; 03230 03231 /* 03232 * In case of session resuming, invert the client and server 03233 * ChangeCipherSpec messages order. 03234 */ 03235 if( ssl->handshake->resume != 0 ) 03236 { 03237 if( ssl->endpoint == SSL_IS_CLIENT ) 03238 ssl->state = SSL_HANDSHAKE_WRAPUP; 03239 else 03240 ssl->state = SSL_CLIENT_CHANGE_CIPHER_SPEC; 03241 } 03242 else 03243 ssl->state++; 03244 03245 /* 03246 * Switch to our negotiated transform and session parameters for outbound 03247 * data. 03248 */ 03249 SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) ); 03250 ssl->transform_out = ssl->transform_negotiate; 03251 ssl->session_out = ssl->session_negotiate; 03252 memset( ssl->out_ctr, 0, 8 ); 03253 03254 #if defined(POLARSSL_SSL_HW_RECORD_ACCEL) 03255 if( ssl_hw_record_activate != NULL) 03256 { 03257 if( ( ret = ssl_hw_record_activate( ssl, SSL_CHANNEL_OUTBOUND ) ) != 0 ) 03258 { 03259 SSL_DEBUG_RET( 1, "ssl_hw_record_activate", ret ); 03260 return( POLARSSL_ERR_SSL_HW_ACCEL_FAILED ); 03261 } 03262 } 03263 #endif 03264 03265 if( ( ret = ssl_write_record( ssl ) ) != 0 ) 03266 { 03267 SSL_DEBUG_RET( 1, "ssl_write_record", ret ); 03268 return( ret ); 03269 } 03270 03271 SSL_DEBUG_MSG( 2, ( "<= write finished" ) ); 03272 03273 return( 0 ); 03274 } 03275 03276 int ssl_parse_finished( ssl_context *ssl ) 03277 { 03278 int ret; 03279 unsigned int hash_len; 03280 unsigned char buf[36]; 03281 03282 SSL_DEBUG_MSG( 2, ( "=> parse finished" ) ); 03283 03284 ssl->handshake->calc_finished( ssl, buf, ssl->endpoint ^ 1 ); 03285 03286 /* 03287 * Switch to our negotiated transform and session parameters for inbound 03288 * data. 03289 */ 03290 SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) ); 03291 ssl->transform_in = ssl->transform_negotiate; 03292 ssl->session_in = ssl->session_negotiate; 03293 memset( ssl->in_ctr, 0, 8 ); 03294 03295 /* 03296 * Set the in_msg pointer to the correct location based on IV length 03297 */ 03298 if( ssl->minor_ver >= SSL_MINOR_VERSION_2 ) 03299 { 03300 ssl->in_msg = ssl->in_iv + ssl->transform_negotiate->ivlen - 03301 ssl->transform_negotiate->fixed_ivlen; 03302 } 03303 else 03304 ssl->in_msg = ssl->in_iv; 03305 03306 #if defined(POLARSSL_SSL_HW_RECORD_ACCEL) 03307 if( ssl_hw_record_activate != NULL) 03308 { 03309 if( ( ret = ssl_hw_record_activate( ssl, SSL_CHANNEL_INBOUND ) ) != 0 ) 03310 { 03311 SSL_DEBUG_RET( 1, "ssl_hw_record_activate", ret ); 03312 return( POLARSSL_ERR_SSL_HW_ACCEL_FAILED ); 03313 } 03314 } 03315 #endif 03316 03317 if( ( ret = ssl_read_record ( ssl ) ) != 0 ) 03318 { 03319 SSL_DEBUG_RET( 1, "ssl_read_record", ret ); 03320 return( ret ); 03321 } 03322 03323 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) 03324 { 03325 SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); 03326 return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); 03327 } 03328 03329 // TODO TLS/1.2 Hash length is determined by cipher suite (Page 63) 03330 hash_len = ( ssl->minor_ver == SSL_MINOR_VERSION_0 ) ? 36 : 12; 03331 03332 if( ssl->in_msg[0] != SSL_HS_FINISHED || 03333 ssl->in_hslen != 4 + hash_len ) 03334 { 03335 SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); 03336 return( POLARSSL_ERR_SSL_BAD_HS_FINISHED ); 03337 } 03338 03339 if( safer_memcmp( ssl->in_msg + 4, buf, hash_len ) != 0 ) 03340 { 03341 SSL_DEBUG_MSG( 1, ( "bad finished message" ) ); 03342 return( POLARSSL_ERR_SSL_BAD_HS_FINISHED ); 03343 } 03344 03345 ssl->verify_data_len = hash_len; 03346 memcpy( ssl->peer_verify_data, buf, hash_len ); 03347 03348 if( ssl->handshake->resume != 0 ) 03349 { 03350 if( ssl->endpoint == SSL_IS_CLIENT ) 03351 ssl->state = SSL_CLIENT_CHANGE_CIPHER_SPEC; 03352 03353 if( ssl->endpoint == SSL_IS_SERVER ) 03354 ssl->state = SSL_HANDSHAKE_WRAPUP; 03355 } 03356 else 03357 ssl->state++; 03358 03359 SSL_DEBUG_MSG( 2, ( "<= parse finished" ) ); 03360 03361 return( 0 ); 03362 } 03363 03364 static int ssl_handshake_init( ssl_context *ssl ) 03365 { 03366 if( ssl->transform_negotiate ) 03367 ssl_transform_free( ssl->transform_negotiate ); 03368 else 03369 { 03370 ssl->transform_negotiate = 03371 (ssl_transform *) polarssl_malloc( sizeof(ssl_transform) ); 03372 03373 if( ssl->transform_negotiate != NULL ) 03374 memset( ssl->transform_negotiate, 0, sizeof(ssl_transform) ); 03375 } 03376 03377 if( ssl->session_negotiate ) 03378 ssl_session_free( ssl->session_negotiate ); 03379 else 03380 { 03381 ssl->session_negotiate = 03382 (ssl_session *) polarssl_malloc( sizeof(ssl_session) ); 03383 03384 if( ssl->session_negotiate != NULL ) 03385 memset( ssl->session_negotiate, 0, sizeof(ssl_session) ); 03386 } 03387 03388 if( ssl->handshake ) 03389 ssl_handshake_free( ssl->handshake ); 03390 else 03391 { 03392 ssl->handshake = (ssl_handshake_params *) 03393 polarssl_malloc( sizeof(ssl_handshake_params) ); 03394 03395 if( ssl->handshake != NULL ) 03396 memset( ssl->handshake, 0, sizeof(ssl_handshake_params) ); 03397 } 03398 03399 if( ssl->handshake == NULL || 03400 ssl->transform_negotiate == NULL || 03401 ssl->session_negotiate == NULL ) 03402 { 03403 SSL_DEBUG_MSG( 1, ( "malloc() of ssl sub-contexts failed" ) ); 03404 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03405 } 03406 03407 #if defined(POLARSSL_SSL_PROTO_SSL3) || defined(POLARSSL_SSL_PROTO_TLS1) || \ 03408 defined(POLARSSL_SSL_PROTO_TLS1_1) 03409 md5_starts( &ssl->handshake->fin_md5 ); 03410 sha1_starts( &ssl->handshake->fin_sha1 ); 03411 #endif 03412 #if defined(POLARSSL_SSL_PROTO_TLS1_2) 03413 #if defined(POLARSSL_SHA256_C) 03414 sha256_starts( &ssl->handshake->fin_sha256, 0 ); 03415 #endif 03416 #if defined(POLARSSL_SHA512_C) 03417 sha512_starts( &ssl->handshake->fin_sha512, 1 ); 03418 #endif 03419 #endif /* POLARSSL_SSL_PROTO_TLS1_2 */ 03420 03421 ssl->handshake->update_checksum = ssl_update_checksum_start; 03422 ssl->handshake->sig_alg = SSL_HASH_SHA1; 03423 03424 #if defined(POLARSSL_ECDH_C) 03425 ecdh_init( &ssl->handshake->ecdh_ctx ); 03426 #endif 03427 03428 #if defined(POLARSSL_X509_CRT_PARSE_C) 03429 ssl->handshake->key_cert = ssl->key_cert; 03430 #endif 03431 03432 return( 0 ); 03433 } 03434 03435 /* 03436 * Initialize an SSL context 03437 */ 03438 int ssl_init( ssl_context *ssl ) 03439 { 03440 int ret; 03441 int len = SSL_BUFFER_LEN; 03442 03443 void *sptr1 = ssl->f_dbg; 03444 void *sptr2 = ssl->f_rng; 03445 03446 // SSL_DEBUG_MSG( 1, ( "ssl_init" ) ); 03447 memset( ssl, 0, sizeof( ssl_context ) ); 03448 03449 ssl->f_dbg = sptr1; 03450 ssl->f_rng = sptr2; 03451 03452 /* 03453 * Sane defaults 03454 */ 03455 ssl->min_major_ver = SSL_MIN_MAJOR_VERSION; 03456 ssl->min_minor_ver = SSL_MIN_MINOR_VERSION; 03457 ssl->max_major_ver = SSL_MAX_MAJOR_VERSION; 03458 ssl->max_minor_ver = SSL_MAX_MINOR_VERSION; 03459 03460 ssl_set_ciphersuites( ssl, ssl_list_ciphersuites() ); 03461 03462 #if defined(POLARSSL_DHM_C) 03463 if( ( ret = mpi_read_string( &ssl->dhm_P, 16, 03464 POLARSSL_DHM_RFC5114_MODP_1024_P) ) != 0 || 03465 ( ret = mpi_read_string( &ssl->dhm_G, 16, 03466 POLARSSL_DHM_RFC5114_MODP_1024_G) ) != 0 ) 03467 { 03468 SSL_DEBUG_RET( 1, "mpi_read_string", ret ); 03469 return( ret ); 03470 } 03471 #endif 03472 03473 /* 03474 * Prepare base structures 03475 */ 03476 ssl->in_ctr = (unsigned char *) polarssl_malloc( len ); 03477 ssl->in_hdr = ssl->in_ctr + 8; 03478 ssl->in_iv = ssl->in_ctr + 13; 03479 ssl->in_msg = ssl->in_ctr + 13; 03480 03481 if( ssl->in_ctr == NULL ) 03482 { 03483 SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len ) ); 03484 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03485 } 03486 03487 ssl->out_ctr = (unsigned char *) polarssl_malloc( len ); 03488 ssl->out_hdr = ssl->out_ctr + 8; 03489 ssl->out_iv = ssl->out_ctr + 13; 03490 ssl->out_msg = ssl->out_ctr + 13; 03491 03492 if( ssl->out_ctr == NULL ) 03493 { 03494 SSL_DEBUG_MSG( 1, ( "malloc(%d bytes) failed", len ) ); 03495 polarssl_free( ssl->in_ctr ); 03496 ssl->in_ctr = NULL; 03497 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03498 } 03499 03500 memset( ssl-> in_ctr, 0, SSL_BUFFER_LEN ); 03501 memset( ssl->out_ctr, 0, SSL_BUFFER_LEN ); 03502 03503 #if defined(POLARSSL_SSL_SESSION_TICKETS) 03504 ssl->ticket_lifetime = SSL_DEFAULT_TICKET_LIFETIME; 03505 #endif 03506 03507 #if defined(POLARSSL_SSL_SET_CURVES) 03508 ssl->curve_list = ecp_grp_id_list( ); 03509 #endif 03510 03511 if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) 03512 return( ret ); 03513 03514 return( 0 ); 03515 } 03516 03517 /* 03518 * Reset an initialized and used SSL context for re-use while retaining 03519 * all application-set variables, function pointers and data. 03520 */ 03521 int ssl_session_reset( ssl_context *ssl ) 03522 { 03523 int ret; 03524 03525 ssl->state = SSL_HELLO_REQUEST; 03526 ssl->renegotiation = SSL_INITIAL_HANDSHAKE; 03527 ssl->secure_renegotiation = SSL_LEGACY_RENEGOTIATION; 03528 03529 ssl->verify_data_len = 0; 03530 memset( ssl->own_verify_data, 0, 36 ); 03531 memset( ssl->peer_verify_data, 0, 36 ); 03532 03533 ssl->in_offt = NULL; 03534 03535 ssl->in_msg = ssl->in_ctr + 13; 03536 ssl->in_msgtype = 0; 03537 ssl->in_msglen = 0; 03538 ssl->in_left = 0; 03539 03540 ssl->in_hslen = 0; 03541 ssl->nb_zero = 0; 03542 ssl->record_read = 0; 03543 03544 ssl->out_msg = ssl->out_ctr + 13; 03545 ssl->out_msgtype = 0; 03546 ssl->out_msglen = 0; 03547 ssl->out_left = 0; 03548 03549 ssl->transform_in = NULL; 03550 ssl->transform_out = NULL; 03551 03552 memset( ssl->out_ctr, 0, SSL_BUFFER_LEN ); 03553 memset( ssl->in_ctr, 0, SSL_BUFFER_LEN ); 03554 03555 #if defined(POLARSSL_SSL_HW_RECORD_ACCEL) 03556 if( ssl_hw_record_reset != NULL) 03557 { 03558 SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_reset()" ) ); 03559 if( ( ret = ssl_hw_record_reset( ssl ) ) != 0 ) 03560 { 03561 SSL_DEBUG_RET( 1, "ssl_hw_record_reset", ret ); 03562 return( POLARSSL_ERR_SSL_HW_ACCEL_FAILED ); 03563 } 03564 } 03565 #endif 03566 03567 if( ssl->transform ) 03568 { 03569 ssl_transform_free( ssl->transform ); 03570 polarssl_free( ssl->transform ); 03571 ssl->transform = NULL; 03572 } 03573 03574 if( ssl->session ) 03575 { 03576 ssl_session_free( ssl->session ); 03577 polarssl_free( ssl->session ); 03578 ssl->session = NULL; 03579 } 03580 03581 #if defined(POLARSSL_SSL_ALPN) 03582 ssl->alpn_chosen = NULL; 03583 #endif 03584 03585 if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) 03586 return( ret ); 03587 03588 return( 0 ); 03589 } 03590 03591 #if defined(POLARSSL_SSL_SESSION_TICKETS) 03592 /* 03593 * Allocate and initialize ticket keys 03594 */ 03595 static int ssl_ticket_keys_init( ssl_context *ssl ) 03596 { 03597 int ret; 03598 ssl_ticket_keys *tkeys; 03599 unsigned char buf[16]; 03600 03601 if( ssl->ticket_keys != NULL ) 03602 return( 0 ); 03603 03604 tkeys = (ssl_ticket_keys *) polarssl_malloc( sizeof(ssl_ticket_keys) ); 03605 if( tkeys == NULL ) 03606 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03607 03608 if( ( ret = ssl->f_rng( ssl->p_rng, tkeys->key_name, 16 ) ) != 0 ) 03609 { 03610 polarssl_free( tkeys ); 03611 return( ret ); 03612 } 03613 03614 if( ( ret = ssl->f_rng( ssl->p_rng, buf, 16 ) ) != 0 || 03615 ( ret = aes_setkey_enc( &tkeys->enc, buf, 128 ) ) != 0 || 03616 ( ret = aes_setkey_dec( &tkeys->dec, buf, 128 ) ) != 0 ) 03617 { 03618 polarssl_free( tkeys ); 03619 return( ret ); 03620 } 03621 03622 if( ( ret = ssl->f_rng( ssl->p_rng, tkeys->mac_key, 16 ) ) != 0 ) 03623 { 03624 polarssl_free( tkeys ); 03625 return( ret ); 03626 } 03627 03628 ssl->ticket_keys = tkeys; 03629 03630 return( 0 ); 03631 } 03632 #endif /* POLARSSL_SSL_SESSION_TICKETS */ 03633 03634 /* 03635 * SSL set accessors 03636 */ 03637 void ssl_set_endpoint( ssl_context *ssl, int endpoint ) 03638 { 03639 ssl->endpoint = endpoint; 03640 03641 #if defined(POLARSSL_SSL_SESSION_TICKETS) 03642 if( endpoint == SSL_IS_CLIENT ) 03643 ssl->session_tickets = SSL_SESSION_TICKETS_ENABLED; 03644 #endif 03645 } 03646 03647 void ssl_set_authmode( ssl_context *ssl, int authmode ) 03648 { 03649 ssl->authmode = authmode; 03650 } 03651 03652 #if defined(POLARSSL_X509_CRT_PARSE_C) 03653 void ssl_set_verify( ssl_context *ssl, 03654 int (*f_vrfy)(void *, x509_crt *, int, int *), 03655 void *p_vrfy ) 03656 { 03657 ssl->f_vrfy = f_vrfy; 03658 ssl->p_vrfy = p_vrfy; 03659 } 03660 #endif /* POLARSSL_X509_CRT_PARSE_C */ 03661 03662 void ssl_set_rng( ssl_context *ssl, 03663 int (*f_rng)(void *, unsigned char *, size_t), 03664 void *p_rng ) 03665 { 03666 ssl->f_rng = f_rng; 03667 ssl->p_rng = p_rng; 03668 } 03669 03670 void ssl_set_dbg( ssl_context *ssl, 03671 void (*f_dbg)(void *, int, const char *), 03672 void *p_dbg ) 03673 { 03674 ssl->f_dbg = f_dbg; 03675 ssl->p_dbg = p_dbg; 03676 } 03677 03678 void ssl_set_bio( ssl_context *ssl, 03679 int (*f_recv)(void *, unsigned char *, size_t), void *p_recv, 03680 int (*f_send)(void *, const unsigned char *, size_t), void *p_send ) 03681 { 03682 ssl->f_recv = f_recv; 03683 ssl->f_send = f_send; 03684 ssl->p_recv = p_recv; 03685 ssl->p_send = p_send; 03686 } 03687 03688 void ssl_set_session_cache( ssl_context *ssl, 03689 int (*f_get_cache)(void *, ssl_session *), void *p_get_cache, 03690 int (*f_set_cache)(void *, const ssl_session *), void *p_set_cache ) 03691 { 03692 ssl->f_get_cache = f_get_cache; 03693 ssl->p_get_cache = p_get_cache; 03694 ssl->f_set_cache = f_set_cache; 03695 ssl->p_set_cache = p_set_cache; 03696 } 03697 03698 int ssl_set_session( ssl_context *ssl, const ssl_session *session ) 03699 { 03700 int ret; 03701 03702 if( ssl == NULL || 03703 session == NULL || 03704 ssl->session_negotiate == NULL || 03705 ssl->endpoint != SSL_IS_CLIENT ) 03706 { 03707 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 03708 } 03709 03710 if( ( ret = ssl_session_copy( ssl->session_negotiate, session ) ) != 0 ) 03711 return( ret ); 03712 03713 ssl->handshake->resume = 1; 03714 03715 return( 0 ); 03716 } 03717 03718 void ssl_set_ciphersuites( ssl_context *ssl, const int *ciphersuites ) 03719 { 03720 ssl->ciphersuite_list[SSL_MINOR_VERSION_0] = ciphersuites; 03721 ssl->ciphersuite_list[SSL_MINOR_VERSION_1] = ciphersuites; 03722 ssl->ciphersuite_list[SSL_MINOR_VERSION_2] = ciphersuites; 03723 ssl->ciphersuite_list[SSL_MINOR_VERSION_3] = ciphersuites; 03724 } 03725 03726 void ssl_set_ciphersuites_for_version( ssl_context *ssl, 03727 const int *ciphersuites, 03728 int major, int minor ) 03729 { 03730 if( major != SSL_MAJOR_VERSION_3 ) 03731 return; 03732 03733 if( minor < SSL_MINOR_VERSION_0 || minor > SSL_MINOR_VERSION_3 ) 03734 return; 03735 03736 ssl->ciphersuite_list[minor] = ciphersuites; 03737 } 03738 03739 #if defined(POLARSSL_X509_CRT_PARSE_C) 03740 /* Add a new (empty) key_cert entry an return a pointer to it */ 03741 static ssl_key_cert *ssl_add_key_cert( ssl_context *ssl ) 03742 { 03743 ssl_key_cert *key_cert, *last; 03744 03745 key_cert = (ssl_key_cert *) polarssl_malloc( sizeof(ssl_key_cert) ); 03746 if( key_cert == NULL ) 03747 return( NULL ); 03748 03749 memset( key_cert, 0, sizeof( ssl_key_cert ) ); 03750 03751 /* Append the new key_cert to the (possibly empty) current list */ 03752 if( ssl->key_cert == NULL ) 03753 { 03754 ssl->key_cert = key_cert; 03755 if( ssl->handshake != NULL ) 03756 ssl->handshake->key_cert = key_cert; 03757 } 03758 else 03759 { 03760 last = ssl->key_cert; 03761 while( last->next != NULL ) 03762 last = last->next; 03763 last->next = key_cert; 03764 } 03765 03766 return key_cert; 03767 } 03768 03769 void ssl_set_ca_chain( ssl_context *ssl, x509_crt *ca_chain, 03770 x509_crl *ca_crl, const char *peer_cn ) 03771 { 03772 ssl->ca_chain = ca_chain; 03773 ssl->ca_crl = ca_crl; 03774 ssl->peer_cn = peer_cn; 03775 } 03776 03777 int ssl_set_own_cert( ssl_context *ssl, x509_crt *own_cert, 03778 pk_context *pk_key ) 03779 { 03780 ssl_key_cert *key_cert = ssl_add_key_cert( ssl ); 03781 03782 if( key_cert == NULL ) 03783 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03784 03785 key_cert->cert = own_cert; 03786 key_cert->key = pk_key; 03787 03788 return( 0 ); 03789 } 03790 03791 #if defined(POLARSSL_RSA_C) 03792 int ssl_set_own_cert_rsa( ssl_context *ssl, x509_crt *own_cert, 03793 rsa_context *rsa_key ) 03794 { 03795 int ret; 03796 ssl_key_cert *key_cert = ssl_add_key_cert( ssl ); 03797 03798 if( key_cert == NULL ) 03799 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03800 03801 key_cert->key = (pk_context *) polarssl_malloc( sizeof(pk_context) ); 03802 if( key_cert->key == NULL ) 03803 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03804 03805 pk_init( key_cert->key ); 03806 03807 ret = pk_init_ctx( key_cert->key, pk_info_from_type( POLARSSL_PK_RSA ) ); 03808 if( ret != 0 ) 03809 return( ret ); 03810 03811 if( ( ret = rsa_copy( pk_rsa( *key_cert->key ), rsa_key ) ) != 0 ) 03812 return( ret ); 03813 03814 key_cert->cert = own_cert; 03815 key_cert->key_own_alloc = 1; 03816 03817 return( 0 ); 03818 } 03819 #endif /* POLARSSL_RSA_C */ 03820 03821 int ssl_set_own_cert_alt( ssl_context *ssl, x509_crt *own_cert, 03822 void *rsa_key, 03823 rsa_decrypt_func rsa_decrypt, 03824 rsa_sign_func rsa_sign, 03825 rsa_key_len_func rsa_key_len ) 03826 { 03827 int ret; 03828 ssl_key_cert *key_cert = ssl_add_key_cert( ssl ); 03829 03830 if( key_cert == NULL ) 03831 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03832 03833 key_cert->key = (pk_context *) polarssl_malloc( sizeof(pk_context) ); 03834 if( key_cert->key == NULL ) 03835 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03836 03837 pk_init( key_cert->key ); 03838 03839 if( ( ret = pk_init_ctx_rsa_alt( key_cert->key, rsa_key, 03840 rsa_decrypt, rsa_sign, rsa_key_len ) ) != 0 ) 03841 return( ret ); 03842 03843 key_cert->cert = own_cert; 03844 key_cert->key_own_alloc = 1; 03845 03846 return( 0 ); 03847 } 03848 #endif /* POLARSSL_X509_CRT_PARSE_C */ 03849 03850 #if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED) 03851 int ssl_set_psk( ssl_context *ssl, const unsigned char *psk, size_t psk_len, 03852 const unsigned char *psk_identity, size_t psk_identity_len ) 03853 { 03854 if( psk == NULL || psk_identity == NULL ) 03855 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 03856 03857 /* 03858 * The length will be check later anyway, but in case it is obviously 03859 * too large, better abort now. The PMS is as follows: 03860 * other_len (2 bytes) + other + psk_len (2 bytes) + psk 03861 */ 03862 if( psk_len + 4 > POLARSSL_PREMASTER_SIZE ) 03863 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 03864 03865 if( ssl->psk != NULL ) 03866 { 03867 polarssl_free( ssl->psk ); 03868 polarssl_free( ssl->psk_identity ); 03869 } 03870 03871 ssl->psk_len = psk_len; 03872 ssl->psk_identity_len = psk_identity_len; 03873 03874 ssl->psk = (unsigned char *) polarssl_malloc( ssl->psk_len ); 03875 ssl->psk_identity = (unsigned char *) 03876 polarssl_malloc( ssl->psk_identity_len ); 03877 03878 if( ssl->psk == NULL || ssl->psk_identity == NULL ) 03879 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03880 03881 memcpy( ssl->psk, psk, ssl->psk_len ); 03882 memcpy( ssl->psk_identity, psk_identity, ssl->psk_identity_len ); 03883 03884 return( 0 ); 03885 } 03886 03887 void ssl_set_psk_cb( ssl_context *ssl, 03888 int (*f_psk)(void *, ssl_context *, const unsigned char *, 03889 size_t), 03890 void *p_psk ) 03891 { 03892 ssl->f_psk = f_psk; 03893 ssl->p_psk = p_psk; 03894 } 03895 #endif /* POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED */ 03896 03897 #if defined(POLARSSL_DHM_C) 03898 int ssl_set_dh_param( ssl_context *ssl, const char *dhm_P, const char *dhm_G ) 03899 { 03900 int ret; 03901 03902 if( ( ret = mpi_read_string( &ssl->dhm_P, 16, dhm_P ) ) != 0 ) 03903 { 03904 SSL_DEBUG_RET( 1, "mpi_read_string", ret ); 03905 return( ret ); 03906 } 03907 03908 if( ( ret = mpi_read_string( &ssl->dhm_G, 16, dhm_G ) ) != 0 ) 03909 { 03910 SSL_DEBUG_RET( 1, "mpi_read_string", ret ); 03911 return( ret ); 03912 } 03913 03914 return( 0 ); 03915 } 03916 03917 int ssl_set_dh_param_ctx( ssl_context *ssl, dhm_context *dhm_ctx ) 03918 { 03919 int ret; 03920 03921 if( ( ret = mpi_copy(&ssl->dhm_P, &dhm_ctx->P ) ) != 0 ) 03922 { 03923 SSL_DEBUG_RET( 1, "mpi_copy", ret ); 03924 return( ret ); 03925 } 03926 03927 if( ( ret = mpi_copy(&ssl->dhm_G, &dhm_ctx->G ) ) != 0 ) 03928 { 03929 SSL_DEBUG_RET( 1, "mpi_copy", ret ); 03930 return( ret ); 03931 } 03932 03933 return( 0 ); 03934 } 03935 #endif /* POLARSSL_DHM_C */ 03936 03937 #if defined(POLARSSL_SSL_SET_CURVES) 03938 /* 03939 * Set the allowed elliptic curves 03940 */ 03941 void ssl_set_curves( ssl_context *ssl, const ecp_group_id *curve_list ) 03942 { 03943 ssl->curve_list = curve_list; 03944 } 03945 #endif 03946 03947 #if defined(POLARSSL_SSL_SERVER_NAME_INDICATION) 03948 int ssl_set_hostname( ssl_context *ssl, const char *hostname ) 03949 { 03950 if( hostname == NULL ) 03951 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 03952 03953 ssl->hostname_len = strlen( hostname ); 03954 03955 if( ssl->hostname_len + 1 == 0 ) 03956 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 03957 03958 ssl->hostname = (unsigned char *) polarssl_malloc( ssl->hostname_len + 1 ); 03959 03960 if( ssl->hostname == NULL ) 03961 return( POLARSSL_ERR_SSL_MALLOC_FAILED ); 03962 03963 memcpy( ssl->hostname, (const unsigned char *) hostname, 03964 ssl->hostname_len ); 03965 03966 ssl->hostname[ssl->hostname_len] = '\0'; 03967 03968 return( 0 ); 03969 } 03970 03971 void ssl_set_sni( ssl_context *ssl, 03972 int (*f_sni)(void *, ssl_context *, 03973 const unsigned char *, size_t), 03974 void *p_sni ) 03975 { 03976 ssl->f_sni = f_sni; 03977 ssl->p_sni = p_sni; 03978 } 03979 #endif /* POLARSSL_SSL_SERVER_NAME_INDICATION */ 03980 03981 #if defined(POLARSSL_SSL_ALPN) 03982 int ssl_set_alpn_protocols( ssl_context *ssl, const char **protos ) 03983 { 03984 size_t cur_len, tot_len; 03985 const char **p; 03986 03987 /* 03988 * "Empty strings MUST NOT be included and byte strings MUST NOT be 03989 * truncated". Check lengths now rather than later. 03990 */ 03991 tot_len = 0; 03992 for( p = protos; *p != NULL; p++ ) 03993 { 03994 cur_len = strlen( *p ); 03995 tot_len += cur_len; 03996 03997 if( cur_len == 0 || cur_len > 255 || tot_len > 65535 ) 03998 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 03999 } 04000 04001 ssl->alpn_list = protos; 04002 04003 return( 0 ); 04004 } 04005 04006 const char *ssl_get_alpn_protocol( const ssl_context *ssl ) 04007 { 04008 return ssl->alpn_chosen; 04009 } 04010 #endif /* POLARSSL_SSL_ALPN */ 04011 04012 void ssl_set_max_version( ssl_context *ssl, int major, int minor ) 04013 { 04014 if( major >= SSL_MIN_MAJOR_VERSION && major <= SSL_MAX_MAJOR_VERSION && 04015 minor >= SSL_MIN_MINOR_VERSION && minor <= SSL_MAX_MINOR_VERSION ) 04016 { 04017 ssl->max_major_ver = major; 04018 ssl->max_minor_ver = minor; 04019 } 04020 } 04021 04022 void ssl_set_min_version( ssl_context *ssl, int major, int minor ) 04023 { 04024 if( major >= SSL_MIN_MAJOR_VERSION && major <= SSL_MAX_MAJOR_VERSION && 04025 minor >= SSL_MIN_MINOR_VERSION && minor <= SSL_MAX_MINOR_VERSION ) 04026 { 04027 ssl->min_major_ver = major; 04028 ssl->min_minor_ver = minor; 04029 } 04030 } 04031 04032 #if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH) 04033 int ssl_set_max_frag_len( ssl_context *ssl, unsigned char mfl_code ) 04034 { 04035 if( mfl_code >= SSL_MAX_FRAG_LEN_INVALID || 04036 mfl_code_to_length[mfl_code] > SSL_MAX_CONTENT_LEN ) 04037 { 04038 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 04039 } 04040 04041 ssl->mfl_code = mfl_code; 04042 04043 return( 0 ); 04044 } 04045 #endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */ 04046 04047 #if defined(POLARSSL_SSL_TRUNCATED_HMAC) 04048 int ssl_set_truncated_hmac( ssl_context *ssl, int truncate ) 04049 { 04050 if( ssl->endpoint != SSL_IS_CLIENT ) 04051 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 04052 04053 ssl->trunc_hmac = truncate; 04054 04055 return( 0 ); 04056 } 04057 #endif /* POLARSSL_SSL_TRUNCATED_HMAC */ 04058 04059 void ssl_set_renegotiation( ssl_context *ssl, int renegotiation ) 04060 { 04061 ssl->disable_renegotiation = renegotiation; 04062 } 04063 04064 void ssl_legacy_renegotiation( ssl_context *ssl, int allow_legacy ) 04065 { 04066 ssl->allow_legacy_renegotiation = allow_legacy; 04067 } 04068 04069 #if defined(POLARSSL_SSL_SESSION_TICKETS) 04070 int ssl_set_session_tickets( ssl_context *ssl, int use_tickets ) 04071 { 04072 ssl->session_tickets = use_tickets; 04073 04074 if( ssl->endpoint == SSL_IS_CLIENT ) 04075 return( 0 ); 04076 04077 if( ssl->f_rng == NULL ) 04078 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 04079 04080 return( ssl_ticket_keys_init( ssl ) ); 04081 } 04082 04083 void ssl_set_session_ticket_lifetime( ssl_context *ssl, int lifetime ) 04084 { 04085 ssl->ticket_lifetime = lifetime; 04086 } 04087 #endif /* POLARSSL_SSL_SESSION_TICKETS */ 04088 04089 /* 04090 * SSL get accessors 04091 */ 04092 size_t ssl_get_bytes_avail( const ssl_context *ssl ) 04093 { 04094 return( ssl->in_offt == NULL ? 0 : ssl->in_msglen ); 04095 } 04096 04097 int ssl_get_verify_result( const ssl_context *ssl ) 04098 { 04099 return( ssl->session->verify_result ); 04100 } 04101 04102 const char *ssl_get_ciphersuite( const ssl_context *ssl ) 04103 { 04104 if( ssl == NULL || ssl->session == NULL ) 04105 return NULL; 04106 04107 return ssl_get_ciphersuite_name( ssl->session->ciphersuite ); 04108 } 04109 04110 const char *ssl_get_version( const ssl_context *ssl ) 04111 { 04112 switch( ssl->minor_ver ) 04113 { 04114 case SSL_MINOR_VERSION_0: 04115 return( "SSLv3.0" ); 04116 04117 case SSL_MINOR_VERSION_1: 04118 return( "TLSv1.0" ); 04119 04120 case SSL_MINOR_VERSION_2: 04121 return( "TLSv1.1" ); 04122 04123 case SSL_MINOR_VERSION_3: 04124 return( "TLSv1.2" ); 04125 04126 default: 04127 break; 04128 } 04129 return( "unknown" ); 04130 } 04131 04132 #if defined(POLARSSL_X509_CRT_PARSE_C) 04133 const x509_crt *ssl_get_peer_cert( const ssl_context *ssl ) 04134 { 04135 if( ssl == NULL || ssl->session == NULL ) 04136 return NULL; 04137 04138 return ssl->session->peer_cert; 04139 } 04140 #endif /* POLARSSL_X509_CRT_PARSE_C */ 04141 04142 int ssl_get_session( const ssl_context *ssl, ssl_session *dst ) 04143 { 04144 if( ssl == NULL || 04145 dst == NULL || 04146 ssl->session == NULL || 04147 ssl->endpoint != SSL_IS_CLIENT ) 04148 { 04149 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 04150 } 04151 04152 return( ssl_session_copy( dst, ssl->session ) ); 04153 } 04154 04155 /* 04156 * Perform a single step of the SSL handshake 04157 */ 04158 int ssl_handshake_step( ssl_context *ssl ) 04159 { 04160 int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; 04161 04162 #if defined(POLARSSL_SSL_CLI_C) 04163 if( ssl->endpoint == SSL_IS_CLIENT ) 04164 ret = ssl_handshake_client_step( ssl ); 04165 #endif 04166 04167 #if defined(POLARSSL_SSL_SRV_C) 04168 if( ssl->endpoint == SSL_IS_SERVER ) 04169 ret = ssl_handshake_server_step( ssl ); 04170 #endif 04171 04172 return( ret ); 04173 } 04174 04175 /* 04176 * Perform the SSL handshake 04177 */ 04178 int ssl_handshake( ssl_context *ssl ) 04179 { 04180 int ret = 0; 04181 04182 SSL_DEBUG_MSG( 2, ( "=> handshake" ) ); 04183 04184 while( ssl->state != SSL_HANDSHAKE_OVER ) 04185 { 04186 ret = ssl_handshake_step( ssl ); 04187 04188 if( ret != 0 ) 04189 break; 04190 } 04191 04192 SSL_DEBUG_MSG( 2, ( "<= handshake" ) ); 04193 04194 return( ret ); 04195 } 04196 04197 #if defined(POLARSSL_SSL_SRV_C) 04198 /* 04199 * Write HelloRequest to request renegotiation on server 04200 */ 04201 static int ssl_write_hello_request( ssl_context *ssl ) 04202 { 04203 int ret; 04204 04205 SSL_DEBUG_MSG( 2, ( "=> write hello request" ) ); 04206 04207 ssl->out_msglen = 4; 04208 ssl->out_msgtype = SSL_MSG_HANDSHAKE; 04209 ssl->out_msg[0] = SSL_HS_HELLO_REQUEST; 04210 04211 if( ( ret = ssl_write_record( ssl ) ) != 0 ) 04212 { 04213 SSL_DEBUG_RET( 1, "ssl_write_record", ret ); 04214 return( ret ); 04215 } 04216 04217 ssl->renegotiation = SSL_RENEGOTIATION_PENDING; 04218 04219 SSL_DEBUG_MSG( 2, ( "<= write hello request" ) ); 04220 04221 return( 0 ); 04222 } 04223 #endif /* POLARSSL_SSL_SRV_C */ 04224 04225 /* 04226 * Actually renegotiate current connection, triggered by either: 04227 * - calling ssl_renegotiate() on client, 04228 * - receiving a HelloRequest on client during ssl_read(), 04229 * - receiving any handshake message on server during ssl_read() after the 04230 * initial handshake is completed 04231 * If the handshake doesn't complete due to waiting for I/O, it will continue 04232 * during the next calls to ssl_renegotiate() or ssl_read() respectively. 04233 */ 04234 static int ssl_start_renegotiation( ssl_context *ssl ) 04235 { 04236 int ret; 04237 04238 SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) ); 04239 04240 if( ( ret = ssl_handshake_init( ssl ) ) != 0 ) 04241 return( ret ); 04242 04243 ssl->state = SSL_HELLO_REQUEST; 04244 ssl->renegotiation = SSL_RENEGOTIATION; 04245 04246 if( ( ret = ssl_handshake( ssl ) ) != 0 ) 04247 { 04248 SSL_DEBUG_RET( 1, "ssl_handshake", ret ); 04249 return( ret ); 04250 } 04251 04252 SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) ); 04253 04254 return( 0 ); 04255 } 04256 04257 /* 04258 * Renegotiate current connection on client, 04259 * or request renegotiation on server 04260 */ 04261 int ssl_renegotiate( ssl_context *ssl ) 04262 { 04263 int ret = POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE; 04264 04265 #if defined(POLARSSL_SSL_SRV_C) 04266 /* On server, just send the request */ 04267 if( ssl->endpoint == SSL_IS_SERVER ) 04268 { 04269 if( ssl->state != SSL_HANDSHAKE_OVER ) 04270 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 04271 04272 return( ssl_write_hello_request( ssl ) ); 04273 } 04274 #endif /* POLARSSL_SSL_SRV_C */ 04275 04276 #if defined(POLARSSL_SSL_CLI_C) 04277 /* 04278 * On client, either start the renegotiation process or, 04279 * if already in progress, continue the handshake 04280 */ 04281 if( ssl->renegotiation != SSL_RENEGOTIATION ) 04282 { 04283 if( ssl->state != SSL_HANDSHAKE_OVER ) 04284 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 04285 04286 if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 ) 04287 { 04288 SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret ); 04289 return( ret ); 04290 } 04291 } 04292 else 04293 { 04294 if( ( ret = ssl_handshake( ssl ) ) != 0 ) 04295 { 04296 SSL_DEBUG_RET( 1, "ssl_handshake", ret ); 04297 return( ret ); 04298 } 04299 } 04300 #endif /* POLARSSL_SSL_CLI_C */ 04301 04302 return( ret ); 04303 } 04304 04305 /* 04306 * Receive application data decrypted from the SSL layer 04307 */ 04308 int ssl_read( ssl_context *ssl, unsigned char *buf, size_t len ) 04309 { 04310 int ret; 04311 size_t n; 04312 04313 SSL_DEBUG_MSG( 2, ( "=> read" ) ); 04314 04315 if( ssl->state != SSL_HANDSHAKE_OVER ) 04316 { 04317 if( ( ret = ssl_handshake( ssl ) ) != 0 ) 04318 { 04319 SSL_DEBUG_RET( 1, "ssl_handshake", ret ); 04320 return( ret ); 04321 } 04322 } 04323 04324 if( ssl->in_offt == NULL ) 04325 { 04326 if( ( ret = ssl_read_record ( ssl ) ) != 0 ) 04327 { 04328 if( ret == POLARSSL_ERR_SSL_CONN_EOF ) 04329 return( 0 ); 04330 04331 SSL_DEBUG_RET( 1, "ssl_read_record", ret ); 04332 return( ret ); 04333 } 04334 04335 if( ssl->in_msglen == 0 && 04336 ssl->in_msgtype == SSL_MSG_APPLICATION_DATA ) 04337 { 04338 /* 04339 * OpenSSL sends empty messages to randomize the IV 04340 */ 04341 if( ( ret = ssl_read_record ( ssl ) ) != 0 ) 04342 { 04343 if( ret == POLARSSL_ERR_SSL_CONN_EOF ) 04344 return( 0 ); 04345 04346 SSL_DEBUG_RET( 1, "ssl_read_record", ret ); 04347 return( ret ); 04348 } 04349 } 04350 04351 if( ssl->in_msgtype == SSL_MSG_HANDSHAKE ) 04352 { 04353 SSL_DEBUG_MSG( 1, ( "received handshake message" ) ); 04354 04355 if( ssl->endpoint == SSL_IS_CLIENT && 04356 ( ssl->in_msg[0] != SSL_HS_HELLO_REQUEST || 04357 ssl->in_hslen != 4 ) ) 04358 { 04359 SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) ); 04360 return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); 04361 } 04362 04363 if( ssl->disable_renegotiation == SSL_RENEGOTIATION_DISABLED || 04364 ( ssl->secure_renegotiation == SSL_LEGACY_RENEGOTIATION && 04365 ssl->allow_legacy_renegotiation == 04366 SSL_LEGACY_NO_RENEGOTIATION ) ) 04367 { 04368 SSL_DEBUG_MSG( 3, ( "ignoring renegotiation, sending alert" ) ); 04369 04370 #if defined(POLARSSL_SSL_PROTO_SSL3) 04371 if( ssl->minor_ver == SSL_MINOR_VERSION_0 ) 04372 { 04373 /* 04374 * SSLv3 does not have a "no_renegotiation" alert 04375 */ 04376 if( ( ret = ssl_send_fatal_handshake_failure( ssl ) ) != 0 ) 04377 return( ret ); 04378 } 04379 else 04380 #endif /* POLARSSL_SSL_PROTO_SSL3 */ 04381 #if defined(POLARSSL_SSL_PROTO_TLS1) || defined(POLARSSL_SSL_PROTO_TLS1_1) || \ 04382 defined(POLARSSL_SSL_PROTO_TLS1_2) 04383 if( ssl->minor_ver >= SSL_MINOR_VERSION_1 ) 04384 { 04385 if( ( ret = ssl_send_alert_message( ssl, 04386 SSL_ALERT_LEVEL_WARNING, 04387 SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 ) 04388 { 04389 return( ret ); 04390 } 04391 } 04392 else 04393 #endif /* POLARSSL_SSL_PROTO_TLS1 || POLARSSL_SSL_PROTO_TLS1_1 || 04394 POLARSSL_SSL_PROTO_TLS1_2 */ 04395 { 04396 SSL_DEBUG_MSG( 1, ( "should never happen" ) ); 04397 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 04398 } 04399 } 04400 else 04401 { 04402 if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 ) 04403 { 04404 SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret ); 04405 return( ret ); 04406 } 04407 04408 return( POLARSSL_ERR_NET_WANT_READ ); 04409 } 04410 } 04411 else if( ssl->renegotiation == SSL_RENEGOTIATION_PENDING ) 04412 { 04413 SSL_DEBUG_MSG( 1, ( "renegotiation requested, " 04414 "but not honored by client" ) ); 04415 return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); 04416 } 04417 else if( ssl->in_msgtype != SSL_MSG_APPLICATION_DATA ) 04418 { 04419 SSL_DEBUG_MSG( 1, ( "bad application data message" ) ); 04420 return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); 04421 } 04422 04423 ssl->in_offt = ssl->in_msg; 04424 } 04425 04426 n = ( len < ssl->in_msglen ) 04427 ? len : ssl->in_msglen; 04428 04429 memcpy( buf, ssl->in_offt, n ); 04430 ssl->in_msglen -= n; 04431 04432 if( ssl->in_msglen == 0 ) 04433 /* all bytes consumed */ 04434 ssl->in_offt = NULL; 04435 else 04436 /* more data available */ 04437 ssl->in_offt += n; 04438 04439 SSL_DEBUG_MSG( 2, ( "<= read" ) ); 04440 04441 return( (int) n ); 04442 } 04443 04444 /* 04445 * Send application data to be encrypted by the SSL layer 04446 */ 04447 int ssl_write( ssl_context *ssl, const unsigned char *buf, size_t len ) 04448 { 04449 int ret; 04450 size_t n; 04451 unsigned int max_len = SSL_MAX_CONTENT_LEN; 04452 04453 SSL_DEBUG_MSG( 2, ( "=> write" ) ); 04454 04455 if( ssl->state != SSL_HANDSHAKE_OVER ) 04456 { 04457 if( ( ret = ssl_handshake( ssl ) ) != 0 ) 04458 { 04459 SSL_DEBUG_RET( 1, "ssl_handshake", ret ); 04460 return( ret ); 04461 } 04462 } 04463 04464 #if defined(POLARSSL_SSL_MAX_FRAGMENT_LENGTH) 04465 /* 04466 * Assume mfl_code is correct since it was checked when set 04467 */ 04468 max_len = mfl_code_to_length[ssl->mfl_code]; 04469 04470 /* 04471 * Check if a smaller max length was negotiated 04472 */ 04473 if( ssl->session_out != NULL && 04474 mfl_code_to_length[ssl->session_out->mfl_code] < max_len ) 04475 { 04476 max_len = mfl_code_to_length[ssl->session_out->mfl_code]; 04477 } 04478 #endif /* POLARSSL_SSL_MAX_FRAGMENT_LENGTH */ 04479 04480 n = ( len < max_len) ? len : max_len; 04481 04482 if( ssl->out_left != 0 ) 04483 { 04484 if( ( ret = ssl_flush_output( ssl ) ) != 0 ) 04485 { 04486 SSL_DEBUG_RET( 1, "ssl_flush_output", ret ); 04487 return( ret ); 04488 } 04489 } 04490 else 04491 { 04492 ssl->out_msglen = n; 04493 ssl->out_msgtype = SSL_MSG_APPLICATION_DATA; 04494 memcpy( ssl->out_msg, buf, n ); 04495 04496 if( ( ret = ssl_write_record( ssl ) ) != 0 ) 04497 { 04498 SSL_DEBUG_RET( 1, "ssl_write_record", ret ); 04499 return( ret ); 04500 } 04501 } 04502 04503 SSL_DEBUG_MSG( 2, ( "<= write" ) ); 04504 04505 return( (int) n ); 04506 } 04507 04508 /* 04509 * Notify the peer that the connection is being closed 04510 */ 04511 int ssl_close_notify( ssl_context *ssl ) 04512 { 04513 int ret; 04514 04515 SSL_DEBUG_MSG( 2, ( "=> write close notify" ) ); 04516 04517 if( ( ret = ssl_flush_output( ssl ) ) != 0 ) 04518 { 04519 SSL_DEBUG_RET( 1, "ssl_flush_output", ret ); 04520 return( ret ); 04521 } 04522 04523 if( ssl->state == SSL_HANDSHAKE_OVER ) 04524 { 04525 if( ( ret = ssl_send_alert_message( ssl, 04526 SSL_ALERT_LEVEL_WARNING, 04527 SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 ) 04528 { 04529 return( ret ); 04530 } 04531 } 04532 04533 SSL_DEBUG_MSG( 2, ( "<= write close notify" ) ); 04534 04535 return( ret ); 04536 } 04537 04538 void ssl_transform_free( ssl_transform *transform ) 04539 { 04540 #if defined(POLARSSL_ZLIB_SUPPORT) 04541 deflateEnd( &transform->ctx_deflate ); 04542 inflateEnd( &transform->ctx_inflate ); 04543 #endif 04544 04545 cipher_free_ctx( &transform->cipher_ctx_enc ); 04546 cipher_free_ctx( &transform->cipher_ctx_dec ); 04547 04548 md_free_ctx( &transform->md_ctx_enc ); 04549 md_free_ctx( &transform->md_ctx_dec ); 04550 04551 memset( transform, 0, sizeof( ssl_transform ) ); 04552 } 04553 04554 #if defined(POLARSSL_X509_CRT_PARSE_C) 04555 static void ssl_key_cert_free( ssl_key_cert *key_cert ) 04556 { 04557 ssl_key_cert *cur = key_cert, *next; 04558 04559 while( cur != NULL ) 04560 { 04561 next = cur->next; 04562 04563 if( cur->key_own_alloc ) 04564 { 04565 pk_free( cur->key ); 04566 polarssl_free( cur->key ); 04567 } 04568 polarssl_free( cur ); 04569 04570 cur = next; 04571 } 04572 } 04573 #endif /* POLARSSL_X509_CRT_PARSE_C */ 04574 04575 void ssl_handshake_free( ssl_handshake_params *handshake ) 04576 { 04577 #if defined(POLARSSL_DHM_C) 04578 dhm_free( &handshake->dhm_ctx ); 04579 #endif 04580 #if defined(POLARSSL_ECDH_C) 04581 ecdh_free( &handshake->ecdh_ctx ); 04582 #endif 04583 04584 #if defined(POLARSSL_ECDH_C) || defined(POLARSSL_ECDSA_C) 04585 /* explicit void pointer cast for buggy MS compiler */ 04586 polarssl_free( (void *) handshake->curves ); 04587 #endif 04588 04589 #if defined(POLARSSL_X509_CRT_PARSE_C) && \ 04590 defined(POLARSSL_SSL_SERVER_NAME_INDICATION) 04591 /* 04592 * Free only the linked list wrapper, not the keys themselves 04593 * since the belong to the SNI callback 04594 */ 04595 if( handshake->sni_key_cert != NULL ) 04596 { 04597 ssl_key_cert *cur = handshake->sni_key_cert, *next; 04598 04599 while( cur != NULL ) 04600 { 04601 next = cur->next; 04602 polarssl_free( cur ); 04603 cur = next; 04604 } 04605 } 04606 #endif /* POLARSSL_X509_CRT_PARSE_C && POLARSSL_SSL_SERVER_NAME_INDICATION */ 04607 04608 memset( handshake, 0, sizeof( ssl_handshake_params ) ); 04609 } 04610 04611 void ssl_session_free( ssl_session *session ) 04612 { 04613 #if defined(POLARSSL_X509_CRT_PARSE_C) 04614 if( session->peer_cert != NULL ) 04615 { 04616 x509_crt_free( session->peer_cert ); 04617 polarssl_free( session->peer_cert ); 04618 } 04619 #endif 04620 04621 #if defined(POLARSSL_SSL_SESSION_TICKETS) 04622 polarssl_free( session->ticket ); 04623 #endif 04624 04625 memset( session, 0, sizeof( ssl_session ) ); 04626 } 04627 04628 /* 04629 * Free an SSL context 04630 */ 04631 void ssl_free( ssl_context *ssl ) 04632 { 04633 SSL_DEBUG_MSG( 2, ( "=> free" ) ); 04634 04635 if( ssl->out_ctr != NULL ) 04636 { 04637 memset( ssl->out_ctr, 0, SSL_BUFFER_LEN ); 04638 polarssl_free( ssl->out_ctr ); 04639 } 04640 04641 if( ssl->in_ctr != NULL ) 04642 { 04643 memset( ssl->in_ctr, 0, SSL_BUFFER_LEN ); 04644 polarssl_free( ssl->in_ctr ); 04645 } 04646 04647 #if defined(POLARSSL_ZLIB_SUPPORT) 04648 if( ssl->compress_buf != NULL ) 04649 { 04650 memset( ssl->compress_buf, 0, SSL_BUFFER_LEN ); 04651 polarssl_free( ssl->compress_buf ); 04652 } 04653 #endif 04654 04655 #if defined(POLARSSL_DHM_C) 04656 mpi_free( &ssl->dhm_P ); 04657 mpi_free( &ssl->dhm_G ); 04658 #endif 04659 04660 if( ssl->transform ) 04661 { 04662 ssl_transform_free( ssl->transform ); 04663 polarssl_free( ssl->transform ); 04664 } 04665 04666 if( ssl->handshake ) 04667 { 04668 ssl_handshake_free( ssl->handshake ); 04669 ssl_transform_free( ssl->transform_negotiate ); 04670 ssl_session_free( ssl->session_negotiate ); 04671 04672 polarssl_free( ssl->handshake ); 04673 polarssl_free( ssl->transform_negotiate ); 04674 polarssl_free( ssl->session_negotiate ); 04675 } 04676 04677 if( ssl->session ) 04678 { 04679 ssl_session_free( ssl->session ); 04680 polarssl_free( ssl->session ); 04681 } 04682 04683 #if defined(POLARSSL_SSL_SESSION_TICKETS) 04684 polarssl_free( ssl->ticket_keys ); 04685 #endif 04686 04687 #if defined(POLARSSL_SSL_SERVER_NAME_INDICATION) 04688 if ( ssl->hostname != NULL ) 04689 { 04690 memset( ssl->hostname, 0, ssl->hostname_len ); 04691 polarssl_free( ssl->hostname ); 04692 ssl->hostname_len = 0; 04693 } 04694 #endif 04695 04696 #if defined(POLARSSL_KEY_EXCHANGE__SOME__PSK_ENABLED) 04697 if( ssl->psk != NULL ) 04698 { 04699 memset( ssl->psk, 0, ssl->psk_len ); 04700 memset( ssl->psk_identity, 0, ssl->psk_identity_len ); 04701 polarssl_free( ssl->psk ); 04702 polarssl_free( ssl->psk_identity ); 04703 ssl->psk_len = 0; 04704 ssl->psk_identity_len = 0; 04705 } 04706 #endif 04707 04708 #if defined(POLARSSL_X509_CRT_PARSE_C) 04709 ssl_key_cert_free( ssl->key_cert ); 04710 #endif 04711 04712 #if defined(POLARSSL_SSL_HW_RECORD_ACCEL) 04713 if( ssl_hw_record_finish != NULL ) 04714 { 04715 SSL_DEBUG_MSG( 2, ( "going for ssl_hw_record_finish()" ) ); 04716 ssl_hw_record_finish( ssl ); 04717 } 04718 #endif 04719 04720 SSL_DEBUG_MSG( 2, ( "<= free" ) ); 04721 04722 /* Actually clear after last debug message */ 04723 memset( ssl, 0, sizeof( ssl_context ) ); 04724 } 04725 04726 #if defined(POLARSSL_PK_C) 04727 /* 04728 * Convert between POLARSSL_PK_XXX and SSL_SIG_XXX 04729 */ 04730 unsigned char ssl_sig_from_pk( pk_context *pk ) 04731 { 04732 #if defined(POLARSSL_RSA_C) 04733 if( pk_can_do( pk, POLARSSL_PK_RSA ) ) 04734 return( SSL_SIG_RSA ); 04735 #endif 04736 #if defined(POLARSSL_ECDSA_C) 04737 if( pk_can_do( pk, POLARSSL_PK_ECDSA ) ) 04738 return( SSL_SIG_ECDSA ); 04739 #endif 04740 return( SSL_SIG_ANON ); 04741 } 04742 04743 pk_type_t ssl_pk_alg_from_sig( unsigned char sig ) 04744 { 04745 switch( sig ) 04746 { 04747 #if defined(POLARSSL_RSA_C) 04748 case SSL_SIG_RSA: 04749 return( POLARSSL_PK_RSA ); 04750 #endif 04751 #if defined(POLARSSL_ECDSA_C) 04752 case SSL_SIG_ECDSA: 04753 return( POLARSSL_PK_ECDSA ); 04754 #endif 04755 default: 04756 return( POLARSSL_PK_NONE ); 04757 } 04758 } 04759 #endif /* POLARSSL_PK_C */ 04760 04761 /* 04762 * Convert between SSL_HASH_XXX and POLARSSL_MD_XXX 04763 */ 04764 md_type_t ssl_md_alg_from_hash( unsigned char hash ) 04765 { 04766 switch( hash ) 04767 { 04768 #if defined(POLARSSL_MD5_C) 04769 case SSL_HASH_MD5: 04770 return( POLARSSL_MD_MD5 ); 04771 #endif 04772 #if defined(POLARSSL_SHA1_C) 04773 case SSL_HASH_SHA1: 04774 return( POLARSSL_MD_SHA1 ); 04775 #endif 04776 #if defined(POLARSSL_SHA256_C) 04777 case SSL_HASH_SHA224: 04778 return( POLARSSL_MD_SHA224 ); 04779 case SSL_HASH_SHA256: 04780 return( POLARSSL_MD_SHA256 ); 04781 #endif 04782 #if defined(POLARSSL_SHA512_C) 04783 case SSL_HASH_SHA384: 04784 return( POLARSSL_MD_SHA384 ); 04785 case SSL_HASH_SHA512: 04786 return( POLARSSL_MD_SHA512 ); 04787 #endif 04788 default: 04789 return( POLARSSL_MD_NONE ); 04790 } 04791 } 04792 04793 #if defined(POLARSSL_SSL_SET_CURVES) 04794 /* 04795 * Check is a curve proposed by the peer is in our list. 04796 * Return 1 if we're willing to use it, 0 otherwise. 04797 */ 04798 int ssl_curve_is_acceptable( const ssl_context *ssl, ecp_group_id grp_id ) 04799 { 04800 const ecp_group_id *gid; 04801 04802 for( gid = ssl->curve_list; *gid != POLARSSL_ECP_DP_NONE; gid++ ) 04803 if( *gid == grp_id ) 04804 return( 1 ); 04805 04806 return( 0 ); 04807 } 04808 #endif /* POLARSSL_SSL_SET_CURVES */ 04809 04810 #if defined(POLARSSL_X509_CRT_PARSE_C) 04811 int ssl_check_cert_usage( const x509_crt *cert, 04812 const ssl_ciphersuite_t *ciphersuite, 04813 int cert_endpoint ) 04814 { 04815 #if defined(POLARSSL_X509_CHECK_KEY_USAGE) 04816 int usage = 0; 04817 #endif 04818 #if defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE) 04819 const char *ext_oid; 04820 size_t ext_len; 04821 #endif 04822 04823 #if !defined(POLARSSL_X509_CHECK_KEY_USAGE) && \ 04824 !defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE) 04825 ((void) cert); 04826 ((void) cert_endpoint); 04827 #endif 04828 04829 #if defined(POLARSSL_X509_CHECK_KEY_USAGE) 04830 if( cert_endpoint == SSL_IS_SERVER ) 04831 { 04832 /* Server part of the key exchange */ 04833 switch( ciphersuite->key_exchange ) 04834 { 04835 case POLARSSL_KEY_EXCHANGE_RSA: 04836 case POLARSSL_KEY_EXCHANGE_RSA_PSK: 04837 usage = KU_KEY_ENCIPHERMENT; 04838 break; 04839 04840 case POLARSSL_KEY_EXCHANGE_DHE_RSA: 04841 case POLARSSL_KEY_EXCHANGE_ECDHE_RSA: 04842 case POLARSSL_KEY_EXCHANGE_ECDHE_ECDSA: 04843 usage = KU_DIGITAL_SIGNATURE; 04844 break; 04845 04846 case POLARSSL_KEY_EXCHANGE_ECDH_RSA: 04847 case POLARSSL_KEY_EXCHANGE_ECDH_ECDSA: 04848 usage = KU_KEY_AGREEMENT; 04849 break; 04850 04851 /* Don't use default: we want warnings when adding new values */ 04852 case POLARSSL_KEY_EXCHANGE_NONE: 04853 case POLARSSL_KEY_EXCHANGE_PSK: 04854 case POLARSSL_KEY_EXCHANGE_DHE_PSK: 04855 case POLARSSL_KEY_EXCHANGE_ECDHE_PSK: 04856 usage = 0; 04857 } 04858 } 04859 else 04860 { 04861 /* Client auth: we only implement rsa_sign and ecdsa_sign for now */ 04862 usage = KU_DIGITAL_SIGNATURE; 04863 } 04864 04865 if( x509_crt_check_key_usage( cert, usage ) != 0 ) 04866 return( -1 ); 04867 #else 04868 ((void) ciphersuite); 04869 #endif /* POLARSSL_X509_CHECK_KEY_USAGE */ 04870 04871 #if defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE) 04872 if( cert_endpoint == SSL_IS_SERVER ) 04873 { 04874 ext_oid = OID_SERVER_AUTH; 04875 ext_len = OID_SIZE( OID_SERVER_AUTH ); 04876 } 04877 else 04878 { 04879 ext_oid = OID_CLIENT_AUTH; 04880 ext_len = OID_SIZE( OID_CLIENT_AUTH ); 04881 } 04882 04883 if( x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 ) 04884 return( -1 ); 04885 #endif /* POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE */ 04886 04887 return( 0 ); 04888 } 04889 #endif /* POLARSSL_X509_CRT_PARSE_C */ 04890 04891 #endif /* POLARSSL_SSL_TLS_C */ 04892 04893
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