PolarSSL v1.1.4
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00001 /* 00002 * SSLv3/TLSv1 client-side functions 00003 * 00004 * Copyright (C) 2006-2010, 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 #include "polarssl/config.h" 00027 00028 #if defined(POLARSSL_SSL_CLI_C) 00029 00030 #include "polarssl/debug.h" 00031 #include "polarssl/ssl.h" 00032 00033 #if defined(POLARSSL_PKCS11_C) 00034 #include "polarssl/pkcs11.h" 00035 #endif /* defined(POLARSSL_PKCS11_C) */ 00036 00037 #include <stdlib.h> 00038 #include <stdio.h> 00039 #include <time.h> 00040 00041 static int ssl_write_client_hello( ssl_context *ssl ) 00042 { 00043 int ret; 00044 size_t i, n; 00045 unsigned char *buf; 00046 unsigned char *p; 00047 time_t t; 00048 00049 SSL_DEBUG_MSG( 2, ( "=> write client hello" ) ); 00050 00051 ssl->major_ver = SSL_MAJOR_VERSION_3; 00052 ssl->minor_ver = SSL_MINOR_VERSION_0; 00053 00054 if( ssl->max_major_ver == 0 && ssl->max_minor_ver == 0 ) 00055 { 00056 ssl->max_major_ver = SSL_MAJOR_VERSION_3; 00057 ssl->max_minor_ver = SSL_MINOR_VERSION_2; 00058 } 00059 00060 /* 00061 * 0 . 0 handshake type 00062 * 1 . 3 handshake length 00063 * 4 . 5 highest version supported 00064 * 6 . 9 current UNIX time 00065 * 10 . 37 random bytes 00066 */ 00067 buf = ssl->out_msg; 00068 p = buf + 4; 00069 00070 *p++ = (unsigned char) ssl->max_major_ver; 00071 *p++ = (unsigned char) ssl->max_minor_ver; 00072 00073 SSL_DEBUG_MSG( 3, ( "client hello, max version: [%d:%d]", 00074 buf[4], buf[5] ) ); 00075 00076 t = time( NULL ); 00077 *p++ = (unsigned char)( t >> 24 ); 00078 *p++ = (unsigned char)( t >> 16 ); 00079 *p++ = (unsigned char)( t >> 8 ); 00080 *p++ = (unsigned char)( t ); 00081 00082 SSL_DEBUG_MSG( 3, ( "client hello, current time: %lu", t ) ); 00083 00084 if( ( ret = ssl->f_rng( ssl->p_rng, p, 28 ) ) != 0 ) 00085 return( ret ); 00086 00087 p += 28; 00088 00089 memcpy( ssl->randbytes, buf + 6, 32 ); 00090 00091 SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 6, 32 ); 00092 00093 /* 00094 * 38 . 38 session id length 00095 * 39 . 39+n session id 00096 * 40+n . 41+n ciphersuitelist length 00097 * 42+n . .. ciphersuitelist 00098 * .. . .. compression alg. (0) 00099 * .. . .. extensions (unused) 00100 */ 00101 n = ssl->session->length; 00102 00103 if( n < 16 || n > 32 || ssl->resume == 0 || 00104 ( ssl->timeout != 0 && t - ssl->session->start > ssl->timeout ) ) 00105 n = 0; 00106 00107 *p++ = (unsigned char) n; 00108 00109 for( i = 0; i < n; i++ ) 00110 *p++ = ssl->session->id[i]; 00111 00112 SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) ); 00113 SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n ); 00114 00115 for( n = 0; ssl->ciphersuites[n] != 0; n++ ); 00116 *p++ = (unsigned char)( n >> 7 ); 00117 *p++ = (unsigned char)( n << 1 ); 00118 00119 SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites", n ) ); 00120 00121 for( i = 0; i < n; i++ ) 00122 { 00123 SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %2d", 00124 ssl->ciphersuites[i] ) ); 00125 00126 *p++ = (unsigned char)( ssl->ciphersuites[i] >> 8 ); 00127 *p++ = (unsigned char)( ssl->ciphersuites[i] ); 00128 } 00129 00130 SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) ); 00131 SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d", 0 ) ); 00132 00133 *p++ = 1; 00134 *p++ = SSL_COMPRESS_NULL; 00135 00136 if ( ssl->hostname != NULL ) 00137 { 00138 SSL_DEBUG_MSG( 3, ( "client hello, server name extension: %s", 00139 ssl->hostname ) ); 00140 00141 *p++ = (unsigned char)( ( (ssl->hostname_len + 9) >> 8 ) & 0xFF ); 00142 *p++ = (unsigned char)( ( (ssl->hostname_len + 9) ) & 0xFF ); 00143 00144 *p++ = (unsigned char)( ( TLS_EXT_SERVERNAME >> 8 ) & 0xFF ); 00145 *p++ = (unsigned char)( ( TLS_EXT_SERVERNAME ) & 0xFF ); 00146 00147 *p++ = (unsigned char)( ( (ssl->hostname_len + 5) >> 8 ) & 0xFF ); 00148 *p++ = (unsigned char)( ( (ssl->hostname_len + 5) ) & 0xFF ); 00149 00150 *p++ = (unsigned char)( ( (ssl->hostname_len + 3) >> 8 ) & 0xFF ); 00151 *p++ = (unsigned char)( ( (ssl->hostname_len + 3) ) & 0xFF ); 00152 00153 *p++ = (unsigned char)( ( TLS_EXT_SERVERNAME_HOSTNAME ) & 0xFF ); 00154 *p++ = (unsigned char)( ( ssl->hostname_len >> 8 ) & 0xFF ); 00155 *p++ = (unsigned char)( ( ssl->hostname_len ) & 0xFF ); 00156 00157 memcpy( p, ssl->hostname, ssl->hostname_len ); 00158 00159 p += ssl->hostname_len; 00160 } 00161 00162 ssl->out_msglen = p - buf; 00163 ssl->out_msgtype = SSL_MSG_HANDSHAKE; 00164 ssl->out_msg[0] = SSL_HS_CLIENT_HELLO; 00165 00166 ssl->state++; 00167 00168 if( ( ret = ssl_write_record( ssl ) ) != 0 ) 00169 { 00170 SSL_DEBUG_RET( 1, "ssl_write_record", ret ); 00171 return( ret ); 00172 } 00173 00174 SSL_DEBUG_MSG( 2, ( "<= write client hello" ) ); 00175 00176 return( 0 ); 00177 } 00178 00179 static int ssl_parse_server_hello( ssl_context *ssl ) 00180 { 00181 #if defined(POLARSSL_DEBUG_MSG) && defined(POLARSSL_DEBUG_C) 00182 time_t t; 00183 #endif 00184 int ret, i; 00185 size_t n; 00186 int ext_len; 00187 unsigned char *buf; 00188 00189 SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) ); 00190 00191 /* 00192 * 0 . 0 handshake type 00193 * 1 . 3 handshake length 00194 * 4 . 5 protocol version 00195 * 6 . 9 UNIX time() 00196 * 10 . 37 random bytes 00197 */ 00198 buf = ssl->in_msg; 00199 00200 if( ( ret = ssl_read_record( ssl ) ) != 0 ) 00201 { 00202 SSL_DEBUG_RET( 1, "ssl_read_record", ret ); 00203 return( ret ); 00204 } 00205 00206 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) 00207 { 00208 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); 00209 return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); 00210 } 00211 00212 SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]", 00213 buf[4], buf[5] ) ); 00214 00215 if( ssl->in_hslen < 42 || 00216 buf[0] != SSL_HS_SERVER_HELLO || 00217 buf[4] != SSL_MAJOR_VERSION_3 ) 00218 { 00219 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); 00220 return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); 00221 } 00222 00223 if( buf[5] > ssl->max_minor_ver ) 00224 { 00225 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); 00226 return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); 00227 } 00228 00229 ssl->minor_ver = buf[5]; 00230 00231 #if defined(POLARSSL_DEBUG_MSG) && defined(POLARSSL_DEBUG_C) 00232 t = ( (time_t) buf[6] << 24 ) 00233 | ( (time_t) buf[7] << 16 ) 00234 | ( (time_t) buf[8] << 8 ) 00235 | ( (time_t) buf[9] ); 00236 #endif 00237 00238 memcpy( ssl->randbytes + 32, buf + 6, 32 ); 00239 00240 n = buf[38]; 00241 00242 SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) ); 00243 SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 ); 00244 00245 /* 00246 * 38 . 38 session id length 00247 * 39 . 38+n session id 00248 * 39+n . 40+n chosen ciphersuite 00249 * 41+n . 41+n chosen compression alg. 00250 * 42+n . 43+n extensions length 00251 * 44+n . 44+n+m extensions 00252 */ 00253 if( n > 32 || ssl->in_hslen > 42 + n ) 00254 { 00255 ext_len = ( ( buf[42 + n] << 8 ) 00256 | ( buf[43 + n] ) ) + 2; 00257 } 00258 else 00259 { 00260 ext_len = 0; 00261 } 00262 00263 if( n > 32 || ssl->in_hslen != 42 + n + ext_len ) 00264 { 00265 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); 00266 return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); 00267 } 00268 00269 i = ( buf[39 + n] << 8 ) | buf[40 + n]; 00270 00271 SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) ); 00272 SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n ); 00273 00274 /* 00275 * Check if the session can be resumed 00276 */ 00277 if( ssl->resume == 0 || n == 0 || 00278 ssl->session->ciphersuite != i || 00279 ssl->session->length != n || 00280 memcmp( ssl->session->id, buf + 39, n ) != 0 ) 00281 { 00282 ssl->state++; 00283 ssl->resume = 0; 00284 ssl->session->start = time( NULL ); 00285 ssl->session->ciphersuite = i; 00286 ssl->session->length = n; 00287 memcpy( ssl->session->id, buf + 39, n ); 00288 } 00289 else 00290 { 00291 ssl->state = SSL_SERVER_CHANGE_CIPHER_SPEC; 00292 00293 if( ( ret = ssl_derive_keys( ssl ) ) != 0 ) 00294 { 00295 SSL_DEBUG_RET( 1, "ssl_derive_keys", ret ); 00296 return( ret ); 00297 } 00298 } 00299 00300 SSL_DEBUG_MSG( 3, ( "%s session has been resumed", 00301 ssl->resume ? "a" : "no" ) ); 00302 00303 SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %d", i ) ); 00304 SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", buf[41 + n] ) ); 00305 00306 i = 0; 00307 while( 1 ) 00308 { 00309 if( ssl->ciphersuites[i] == 0 ) 00310 { 00311 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); 00312 return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); 00313 } 00314 00315 if( ssl->ciphersuites[i++] == ssl->session->ciphersuite ) 00316 break; 00317 } 00318 00319 if( buf[41 + n] != SSL_COMPRESS_NULL ) 00320 { 00321 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) ); 00322 return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO ); 00323 } 00324 00325 /* TODO: Process extensions */ 00326 00327 SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) ); 00328 00329 return( 0 ); 00330 } 00331 00332 static int ssl_parse_server_key_exchange( ssl_context *ssl ) 00333 { 00334 #if defined(POLARSSL_DHM_C) 00335 int ret; 00336 size_t n; 00337 unsigned char *p, *end; 00338 unsigned char hash[36]; 00339 md5_context md5; 00340 sha1_context sha1; 00341 #endif 00342 00343 SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) ); 00344 00345 if( ssl->session->ciphersuite != SSL_EDH_RSA_DES_168_SHA && 00346 ssl->session->ciphersuite != SSL_EDH_RSA_AES_128_SHA && 00347 ssl->session->ciphersuite != SSL_EDH_RSA_AES_256_SHA && 00348 ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_128_SHA && 00349 ssl->session->ciphersuite != SSL_EDH_RSA_CAMELLIA_256_SHA) 00350 { 00351 SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) ); 00352 ssl->state++; 00353 return( 0 ); 00354 } 00355 00356 #if !defined(POLARSSL_DHM_C) 00357 SSL_DEBUG_MSG( 1, ( "support for dhm in not available" ) ); 00358 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 00359 #else 00360 if( ( ret = ssl_read_record( ssl ) ) != 0 ) 00361 { 00362 SSL_DEBUG_RET( 1, "ssl_read_record", ret ); 00363 return( ret ); 00364 } 00365 00366 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) 00367 { 00368 SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); 00369 return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); 00370 } 00371 00372 if( ssl->in_msg[0] != SSL_HS_SERVER_KEY_EXCHANGE ) 00373 { 00374 SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); 00375 return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); 00376 } 00377 00378 /* 00379 * Ephemeral DH parameters: 00380 * 00381 * struct { 00382 * opaque dh_p<1..2^16-1>; 00383 * opaque dh_g<1..2^16-1>; 00384 * opaque dh_Ys<1..2^16-1>; 00385 * } ServerDHParams; 00386 */ 00387 p = ssl->in_msg + 4; 00388 end = ssl->in_msg + ssl->in_hslen; 00389 00390 if( ( ret = dhm_read_params( &ssl->dhm_ctx, &p, end ) ) != 0 ) 00391 { 00392 SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); 00393 return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); 00394 } 00395 00396 if( (unsigned int)( end - p ) != ssl->peer_cert->rsa.len ) 00397 { 00398 SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); 00399 return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); 00400 } 00401 00402 if( ssl->dhm_ctx.len < 64 || ssl->dhm_ctx.len > 512 ) 00403 { 00404 SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) ); 00405 return( POLARSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE ); 00406 } 00407 00408 SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->dhm_ctx.P ); 00409 SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->dhm_ctx.G ); 00410 SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->dhm_ctx.GY ); 00411 00412 /* 00413 * digitally-signed struct { 00414 * opaque md5_hash[16]; 00415 * opaque sha_hash[20]; 00416 * }; 00417 * 00418 * md5_hash 00419 * MD5(ClientHello.random + ServerHello.random 00420 * + ServerParams); 00421 * sha_hash 00422 * SHA(ClientHello.random + ServerHello.random 00423 * + ServerParams); 00424 */ 00425 n = ssl->in_hslen - ( end - p ) - 6; 00426 00427 md5_starts( &md5 ); 00428 md5_update( &md5, ssl->randbytes, 64 ); 00429 md5_update( &md5, ssl->in_msg + 4, n ); 00430 md5_finish( &md5, hash ); 00431 00432 sha1_starts( &sha1 ); 00433 sha1_update( &sha1, ssl->randbytes, 64 ); 00434 sha1_update( &sha1, ssl->in_msg + 4, n ); 00435 sha1_finish( &sha1, hash + 16 ); 00436 00437 SSL_DEBUG_BUF( 3, "parameters hash", hash, 36 ); 00438 00439 if( ( ret = rsa_pkcs1_verify( &ssl->peer_cert->rsa, RSA_PUBLIC, 00440 SIG_RSA_RAW, 36, hash, p ) ) != 0 ) 00441 { 00442 SSL_DEBUG_RET( 1, "rsa_pkcs1_verify", ret ); 00443 return( ret ); 00444 } 00445 00446 ssl->state++; 00447 00448 SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) ); 00449 00450 return( 0 ); 00451 #endif 00452 } 00453 00454 static int ssl_parse_certificate_request( ssl_context *ssl ) 00455 { 00456 int ret; 00457 00458 SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) ); 00459 00460 /* 00461 * 0 . 0 handshake type 00462 * 1 . 3 handshake length 00463 * 4 . 5 SSL version 00464 * 6 . 6 cert type count 00465 * 7 .. n-1 cert types 00466 * n .. n+1 length of all DNs 00467 * n+2 .. n+3 length of DN 1 00468 * n+4 .. ... Distinguished Name #1 00469 * ... .. ... length of DN 2, etc. 00470 */ 00471 if( ( ret = ssl_read_record( ssl ) ) != 0 ) 00472 { 00473 SSL_DEBUG_RET( 1, "ssl_read_record", ret ); 00474 return( ret ); 00475 } 00476 00477 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) 00478 { 00479 SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) ); 00480 return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); 00481 } 00482 00483 ssl->client_auth = 0; 00484 ssl->state++; 00485 00486 if( ssl->in_msg[0] == SSL_HS_CERTIFICATE_REQUEST ) 00487 ssl->client_auth++; 00488 00489 SSL_DEBUG_MSG( 3, ( "got %s certificate request", 00490 ssl->client_auth ? "a" : "no" ) ); 00491 00492 SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) ); 00493 00494 return( 0 ); 00495 } 00496 00497 static int ssl_parse_server_hello_done( ssl_context *ssl ) 00498 { 00499 int ret; 00500 00501 SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) ); 00502 00503 if( ssl->client_auth != 0 ) 00504 { 00505 if( ( ret = ssl_read_record( ssl ) ) != 0 ) 00506 { 00507 SSL_DEBUG_RET( 1, "ssl_read_record", ret ); 00508 return( ret ); 00509 } 00510 00511 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE ) 00512 { 00513 SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) ); 00514 return( POLARSSL_ERR_SSL_UNEXPECTED_MESSAGE ); 00515 } 00516 } 00517 00518 if( ssl->in_hslen != 4 || 00519 ssl->in_msg[0] != SSL_HS_SERVER_HELLO_DONE ) 00520 { 00521 SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) ); 00522 return( POLARSSL_ERR_SSL_BAD_HS_SERVER_HELLO_DONE ); 00523 } 00524 00525 ssl->state++; 00526 00527 SSL_DEBUG_MSG( 2, ( "<= parse server hello done" ) ); 00528 00529 return( 0 ); 00530 } 00531 00532 static int ssl_write_client_key_exchange( ssl_context *ssl ) 00533 { 00534 int ret; 00535 size_t i, n; 00536 00537 SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) ); 00538 00539 if( ssl->session->ciphersuite == SSL_EDH_RSA_DES_168_SHA || 00540 ssl->session->ciphersuite == SSL_EDH_RSA_AES_128_SHA || 00541 ssl->session->ciphersuite == SSL_EDH_RSA_AES_256_SHA || 00542 ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_128_SHA || 00543 ssl->session->ciphersuite == SSL_EDH_RSA_CAMELLIA_256_SHA) 00544 { 00545 #if !defined(POLARSSL_DHM_C) 00546 SSL_DEBUG_MSG( 1, ( "support for dhm in not available" ) ); 00547 return( POLARSSL_ERR_SSL_FEATURE_UNAVAILABLE ); 00548 #else 00549 /* 00550 * DHM key exchange -- send G^X mod P 00551 */ 00552 n = ssl->dhm_ctx.len; 00553 00554 ssl->out_msg[4] = (unsigned char)( n >> 8 ); 00555 ssl->out_msg[5] = (unsigned char)( n ); 00556 i = 6; 00557 00558 ret = dhm_make_public( &ssl->dhm_ctx, 256, 00559 &ssl->out_msg[i], n, 00560 ssl->f_rng, ssl->p_rng ); 00561 if( ret != 0 ) 00562 { 00563 SSL_DEBUG_RET( 1, "dhm_make_public", ret ); 00564 return( ret ); 00565 } 00566 00567 SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->dhm_ctx.X ); 00568 SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->dhm_ctx.GX ); 00569 00570 ssl->pmslen = ssl->dhm_ctx.len; 00571 00572 if( ( ret = dhm_calc_secret( &ssl->dhm_ctx, 00573 ssl->premaster, 00574 &ssl->pmslen ) ) != 0 ) 00575 { 00576 SSL_DEBUG_RET( 1, "dhm_calc_secret", ret ); 00577 return( ret ); 00578 } 00579 00580 SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->dhm_ctx.K ); 00581 #endif 00582 } 00583 else 00584 { 00585 /* 00586 * RSA key exchange -- send rsa_public(pkcs1 v1.5(premaster)) 00587 */ 00588 ssl->premaster[0] = (unsigned char) ssl->max_major_ver; 00589 ssl->premaster[1] = (unsigned char) ssl->max_minor_ver; 00590 ssl->pmslen = 48; 00591 00592 ret = ssl->f_rng( ssl->p_rng, ssl->premaster + 2, ssl->pmslen - 2 ); 00593 if( ret != 0 ) 00594 return( ret ); 00595 00596 i = 4; 00597 n = ssl->peer_cert->rsa.len; 00598 00599 if( ssl->minor_ver != SSL_MINOR_VERSION_0 ) 00600 { 00601 i += 2; 00602 ssl->out_msg[4] = (unsigned char)( n >> 8 ); 00603 ssl->out_msg[5] = (unsigned char)( n ); 00604 } 00605 00606 ret = rsa_pkcs1_encrypt( &ssl->peer_cert->rsa, 00607 ssl->f_rng, ssl->p_rng, 00608 RSA_PUBLIC, 00609 ssl->pmslen, ssl->premaster, 00610 ssl->out_msg + i ); 00611 if( ret != 0 ) 00612 { 00613 SSL_DEBUG_RET( 1, "rsa_pkcs1_encrypt", ret ); 00614 return( ret ); 00615 } 00616 } 00617 00618 if( ( ret = ssl_derive_keys( ssl ) ) != 0 ) 00619 { 00620 SSL_DEBUG_RET( 1, "ssl_derive_keys", ret ); 00621 return( ret ); 00622 } 00623 00624 ssl->out_msglen = i + n; 00625 ssl->out_msgtype = SSL_MSG_HANDSHAKE; 00626 ssl->out_msg[0] = SSL_HS_CLIENT_KEY_EXCHANGE; 00627 00628 ssl->state++; 00629 00630 if( ( ret = ssl_write_record( ssl ) ) != 0 ) 00631 { 00632 SSL_DEBUG_RET( 1, "ssl_write_record", ret ); 00633 return( ret ); 00634 } 00635 00636 SSL_DEBUG_MSG( 2, ( "<= write client key exchange" ) ); 00637 00638 return( 0 ); 00639 } 00640 00641 static int ssl_write_certificate_verify( ssl_context *ssl ) 00642 { 00643 int ret = 0; 00644 size_t n = 0; 00645 unsigned char hash[36]; 00646 00647 SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) ); 00648 00649 if( ssl->client_auth == 0 || ssl->own_cert == NULL ) 00650 { 00651 SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) ); 00652 ssl->state++; 00653 return( 0 ); 00654 } 00655 00656 if( ssl->rsa_key == NULL ) 00657 { 00658 #if defined(POLARSSL_PKCS11_C) 00659 if( ssl->pkcs11_key == NULL ) 00660 { 00661 #endif /* defined(POLARSSL_PKCS11_C) */ 00662 SSL_DEBUG_MSG( 1, ( "got no private key" ) ); 00663 return( POLARSSL_ERR_SSL_PRIVATE_KEY_REQUIRED ); 00664 #if defined(POLARSSL_PKCS11_C) 00665 } 00666 #endif /* defined(POLARSSL_PKCS11_C) */ 00667 } 00668 00669 /* 00670 * Make an RSA signature of the handshake digests 00671 */ 00672 ssl_calc_verify( ssl, hash ); 00673 00674 if ( ssl->rsa_key ) 00675 n = ssl->rsa_key->len; 00676 #if defined(POLARSSL_PKCS11_C) 00677 else 00678 n = ssl->pkcs11_key->len; 00679 #endif /* defined(POLARSSL_PKCS11_C) */ 00680 00681 ssl->out_msg[4] = (unsigned char)( n >> 8 ); 00682 ssl->out_msg[5] = (unsigned char)( n ); 00683 00684 if( ssl->rsa_key ) 00685 { 00686 ret = rsa_pkcs1_sign( ssl->rsa_key, ssl->f_rng, ssl->p_rng, 00687 RSA_PRIVATE, SIG_RSA_RAW, 00688 36, hash, ssl->out_msg + 6 ); 00689 } else { 00690 #if defined(POLARSSL_PKCS11_C) 00691 ret = pkcs11_sign( ssl->pkcs11_key, RSA_PRIVATE, SIG_RSA_RAW, 00692 36, hash, ssl->out_msg + 6 ); 00693 #endif /* defined(POLARSSL_PKCS11_C) */ 00694 } 00695 00696 if (ret != 0) 00697 { 00698 SSL_DEBUG_RET( 1, "pkcs1_sign", ret ); 00699 return( ret ); 00700 } 00701 00702 ssl->out_msglen = 6 + n; 00703 ssl->out_msgtype = SSL_MSG_HANDSHAKE; 00704 ssl->out_msg[0] = SSL_HS_CERTIFICATE_VERIFY; 00705 00706 ssl->state++; 00707 00708 if( ( ret = ssl_write_record( ssl ) ) != 0 ) 00709 { 00710 SSL_DEBUG_RET( 1, "ssl_write_record", ret ); 00711 return( ret ); 00712 } 00713 00714 SSL_DEBUG_MSG( 2, ( "<= write certificate verify" ) ); 00715 00716 return( 0 ); 00717 } 00718 00719 /* 00720 * SSL handshake -- client side 00721 */ 00722 int ssl_handshake_client( ssl_context *ssl ) 00723 { 00724 int ret = 0; 00725 00726 SSL_DEBUG_MSG( 2, ( "=> handshake client" ) ); 00727 00728 while( ssl->state != SSL_HANDSHAKE_OVER ) 00729 { 00730 SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) ); 00731 00732 if( ( ret = ssl_flush_output( ssl ) ) != 0 ) 00733 break; 00734 00735 switch( ssl->state ) 00736 { 00737 case SSL_HELLO_REQUEST: 00738 ssl->state = SSL_CLIENT_HELLO; 00739 break; 00740 00741 /* 00742 * ==> ClientHello 00743 */ 00744 case SSL_CLIENT_HELLO: 00745 ret = ssl_write_client_hello( ssl ); 00746 break; 00747 00748 /* 00749 * <== ServerHello 00750 * Certificate 00751 * ( ServerKeyExchange ) 00752 * ( CertificateRequest ) 00753 * ServerHelloDone 00754 */ 00755 case SSL_SERVER_HELLO: 00756 ret = ssl_parse_server_hello( ssl ); 00757 break; 00758 00759 case SSL_SERVER_CERTIFICATE: 00760 ret = ssl_parse_certificate( ssl ); 00761 break; 00762 00763 case SSL_SERVER_KEY_EXCHANGE: 00764 ret = ssl_parse_server_key_exchange( ssl ); 00765 break; 00766 00767 case SSL_CERTIFICATE_REQUEST: 00768 ret = ssl_parse_certificate_request( ssl ); 00769 break; 00770 00771 case SSL_SERVER_HELLO_DONE: 00772 ret = ssl_parse_server_hello_done( ssl ); 00773 break; 00774 00775 /* 00776 * ==> ( Certificate/Alert ) 00777 * ClientKeyExchange 00778 * ( CertificateVerify ) 00779 * ChangeCipherSpec 00780 * Finished 00781 */ 00782 case SSL_CLIENT_CERTIFICATE: 00783 ret = ssl_write_certificate( ssl ); 00784 break; 00785 00786 case SSL_CLIENT_KEY_EXCHANGE: 00787 ret = ssl_write_client_key_exchange( ssl ); 00788 break; 00789 00790 case SSL_CERTIFICATE_VERIFY: 00791 ret = ssl_write_certificate_verify( ssl ); 00792 break; 00793 00794 case SSL_CLIENT_CHANGE_CIPHER_SPEC: 00795 ret = ssl_write_change_cipher_spec( ssl ); 00796 break; 00797 00798 case SSL_CLIENT_FINISHED: 00799 ret = ssl_write_finished( ssl ); 00800 break; 00801 00802 /* 00803 * <== ChangeCipherSpec 00804 * Finished 00805 */ 00806 case SSL_SERVER_CHANGE_CIPHER_SPEC: 00807 ret = ssl_parse_change_cipher_spec( ssl ); 00808 break; 00809 00810 case SSL_SERVER_FINISHED: 00811 ret = ssl_parse_finished( ssl ); 00812 break; 00813 00814 case SSL_FLUSH_BUFFERS: 00815 SSL_DEBUG_MSG( 2, ( "handshake: done" ) ); 00816 ssl->state = SSL_HANDSHAKE_OVER; 00817 break; 00818 00819 default: 00820 SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) ); 00821 return( POLARSSL_ERR_SSL_BAD_INPUT_DATA ); 00822 } 00823 00824 if( ret != 0 ) 00825 break; 00826 } 00827 00828 SSL_DEBUG_MSG( 2, ( "<= handshake client" ) ); 00829 00830 return( ret ); 00831 } 00832 00833 #endif