/home/dko/projects/mobilec/trunk/src/security/xyssl-0.9/library/ssl_cli.c

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00001 /*
00002  * SSLv3/TLSv1 client-side functions
00003  *
00004  * Copyright (C) 2006-2007 Christophe Devine
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
00014  * GNU General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU General Public License along
00017  * with this program; if not, write to the Free Software Foundation, Inc.,
00018  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00019  */
00020 
00021 #include "xyssl/config.h"
00022 
00023 #if defined(XYSSL_SSL_CLI_C)
00024 
00025 #include "xyssl/debug.h"
00026 #include "xyssl/ssl.h"
00027 
00028 #include <string.h>
00029 #include <stdlib.h>
00030 #include <stdio.h>
00031 #include <time.h>
00032 
00033 static int ssl_write_client_hello( ssl_context *ssl )
00034 {
00035 int ret, i, n;
00036 unsigned char *buf;
00037 unsigned char *p;
00038 time_t t;
00039 
00040 SSL_DEBUG_MSG( 2, ( "=> write client hello" ) );
00041 
00042 ssl->major_ver = SSL_MAJOR_VERSION_3;
00043 ssl->minor_ver = SSL_MINOR_VERSION_0;
00044 
00045 ssl->max_major_ver = SSL_MAJOR_VERSION_3;
00046 ssl->max_minor_ver = SSL_MINOR_VERSION_1;
00047 
00048 /*
00049  * 0 . 0 handshake type
00050  * 1 . 3 handshake length
00051  * 4 . 5 highest version supported
00052  * 6 . 9 current UNIX time
00053  * 10 . 37 random bytes
00054  */
00055 buf = ssl->out_msg;
00056 p = buf + 4;
00057 
00058 *p++ = (unsigned char) ssl->max_major_ver;
00059 *p++ = (unsigned char) ssl->max_minor_ver;
00060 
00061 SSL_DEBUG_MSG( 3, ( "client hello, max version: [%d:%d]",
00062 buf[4], buf[5] ) );
00063 
00064 t = time( NULL );
00065 *p++ = (unsigned char)( t >> 24 );
00066 *p++ = (unsigned char)( t >> 16 );
00067 *p++ = (unsigned char)( t >> 8 );
00068 *p++ = (unsigned char)( t );
00069 
00070 SSL_DEBUG_MSG( 3, ( "client hello, current time: %lu", t ) );
00071 
00072 for( i = 28; i > 0; i-- )
00073 *p++ = (unsigned char) ssl->f_rng( ssl->p_rng );
00074 
00075 memcpy( ssl->randbytes, buf + 6, 32 );
00076 
00077 SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 6, 32 );
00078 
00079 /*
00080  * 38 . 38 session id length
00081  * 39 . 39+n session id
00082  * 40+n . 41+n cipherlist length
00083  * 42+n . .. cipherlist
00084  * .. . .. compression alg. (0)
00085  * .. . .. extensions (unused)
00086  */
00087 n = ssl->session->length;
00088 
00089 if( n < 16 || n > 32 || ssl->resume == 0 ||
00090 t - ssl->session->start < ssl->timeout )
00091 n = 0;
00092 
00093 *p++ = (unsigned char) n;
00094 
00095 for( i = 0; i < n; i++ )
00096 *p++ = ssl->session->id[i];
00097 
00098 SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) );
00099 SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n );
00100 
00101 for( n = 0; ssl->ciphers[n] != 0; n++ );
00102 *p++ = (unsigned char)( n >> 7 );
00103 *p++ = (unsigned char)( n << 1 );
00104 
00105 SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphers", n ) );
00106 
00107 for( i = 0; i < n; i++ )
00108 {
00109 SSL_DEBUG_MSG( 3, ( "client hello, add cipher: %2d",
00110 ssl->ciphers[i] ) );
00111 
00112 *p++ = (unsigned char)( ssl->ciphers[i] >> 8 );
00113 *p++ = (unsigned char)( ssl->ciphers[i] );
00114 }
00115 
00116 SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) );
00117 SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d", 0 ) );
00118 
00119 *p++ = 1;
00120 *p++ = SSL_COMPRESS_NULL;
00121 
00122 if ( ssl->hostname != NULL ) {
00123 SSL_DEBUG_MSG( 3, ( "client hello, server name extension: %s", ssl->hostname ) );
00124 
00125 // Extensions length
00126 *p++ = (unsigned char)( ( ( ssl->hostname_len + 9 ) >> 8 ) & 0xff );
00127 *p++ = (unsigned char)( ( ( ssl->hostname_len + 9 ) ) & 0xff );
00128 
00129 // Extension type
00130 *p++ = (unsigned char)( ( TLS_EXT_SERVERNAME >> 8 ) & 0xff );
00131 *p++ = (unsigned char)( ( TLS_EXT_SERVERNAME ) & 0xff );
00132 // Extension length
00133 *p++ = (unsigned char)( ( ( ssl->hostname_len + 5 ) >> 8 ) & 0xff );
00134 *p++ = (unsigned char)( ( ( ssl->hostname_len + 5 ) ) & 0xff );
00135 
00136 // Server name list length
00137 *p++ = (unsigned char)( ( ( ssl->hostname_len + 3 ) >> 8 ) & 0xff );
00138 *p++ = (unsigned char)( ( ( ssl->hostname_len + 3 ) ) & 0xff );
00139 
00140 // Name type
00141 *p++ = (unsigned char)( ( TLS_EXT_SERVERNAME_HOSTNAME ) & 0xff );
00142 // Hostname length
00143 *p++ = (unsigned char)( ( ( ssl->hostname_len ) >> 8 ) & 0xff );
00144 *p++ = (unsigned char)( ( ( ssl->hostname_len ) ) & 0xff );
00145 // Hostname
00146 memcpy( p, ssl->hostname, ssl->hostname_len );
00147 p += ssl->hostname_len;
00148 
00149 }
00150 
00151 ssl->out_msglen = p - buf;
00152 ssl->out_msgtype = SSL_MSG_HANDSHAKE;
00153 ssl->out_msg[0] = SSL_HS_CLIENT_HELLO;
00154 
00155 ssl->state++;
00156 
00157 if( ( ret = ssl_write_record( ssl ) ) != 0 )
00158 {
00159 SSL_DEBUG_RET( 1, "ssl_write_record", ret );
00160 return( ret );
00161 }
00162 
00163 SSL_DEBUG_MSG( 2, ( "<= write client hello" ) );
00164 
00165 return( 0 );
00166 }
00167 
00168 static int ssl_parse_server_hello( ssl_context *ssl )
00169 {
00170 time_t t;
00171 int ret, i, n;
00172 int ext_len;
00173 unsigned char *buf;
00174 
00175 SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) );
00176 
00177 /*
00178  * 0 . 0 handshake type
00179  * 1 . 3 handshake length
00180  * 4 . 5 protocol version
00181  * 6 . 9 UNIX time()
00182  * 10 . 37 random bytes
00183  */
00184 buf = ssl->in_msg;
00185 
00186 if( ( ret = ssl_read_record( ssl ) ) != 0 )
00187 {
00188 SSL_DEBUG_RET( 1, "ssl_read_record", ret );
00189 return( ret );
00190 }
00191 
00192 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
00193 {
00194 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
00195 return( XYSSL_ERR_SSL_UNEXPECTED_MESSAGE );
00196 }
00197 
00198 SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
00199 buf[4], buf[5] ) );
00200 
00201 if( ssl->in_hslen < 42 ||
00202 buf[0] != SSL_HS_SERVER_HELLO ||
00203 buf[4] != SSL_MAJOR_VERSION_3 )
00204 {
00205 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
00206 return( XYSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
00207 }
00208 
00209 if( buf[5] != SSL_MINOR_VERSION_0 &&
00210 buf[5] != SSL_MINOR_VERSION_1 )
00211 {
00212 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
00213 return( XYSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
00214 }
00215 
00216 ssl->minor_ver = buf[5];
00217 
00218 t = ( (time_t) buf[6] << 24 )
00219 | ( (time_t) buf[7] << 16 )
00220 | ( (time_t) buf[8] << 8 )
00221 | ( (time_t) buf[9] );
00222 
00223 memcpy( ssl->randbytes + 32, buf + 6, 32 );
00224 
00225 n = buf[38];
00226 
00227 SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
00228 SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
00229 
00230 /*
00231  * 38 . 38 session id length
00232  * 39 . 38+n session id
00233  * 39+n . 40+n chosen cipher
00234  * 41+n . 41+n chosen compression alg.
00235  * 42+n . 43+n extensions length
00236  * 44+n . 44+n+m extensions
00237  */
00238 if( n < 0 || n > 32 || ssl->in_hslen > 42 + n )
00239 {
00240 ext_len = ( ( buf[42 + n] << 8 )
00241 | ( buf[43 + n] ) ) + 2;
00242 }
00243 else
00244 {
00245 ext_len = 0;
00246 }
00247 
00248 if( n < 0 || n > 32 || ssl->in_hslen != 42 + n + ext_len )
00249 {
00250 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
00251 return( XYSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
00252 }
00253 
00254 i = ( buf[39 + n] << 8 ) | buf[40 + n];
00255 
00256 SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
00257 SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
00258 
00259 /*
00260  * Check if the session can be resumed
00261  */
00262 if( ssl->resume == 0 ||
00263 ssl->session->cipher != i ||
00264 ssl->session->length != n ||
00265 memcmp( ssl->session->id, buf + 39, n ) != 0 )
00266 {
00267 ssl->state++;
00268 ssl->resume = 0;
00269 ssl->session->start = time( NULL );
00270 ssl->session->cipher = i;
00271 ssl->session->length = n;
00272 memcpy( ssl->session->id, buf + 39, n );
00273 }
00274 else
00275 {
00276 ssl->state = SSL_SERVER_CHANGE_CIPHER_SPEC;
00277 ssl_derive_keys( ssl );
00278 }
00279 
00280 SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
00281 ssl->resume ? "a" : "no" ) );
00282 
00283 SSL_DEBUG_MSG( 3, ( "server hello, chosen cipher: %d", i ) );
00284 SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", buf[41 + n] ) );
00285 
00286 i = 0;
00287 while( 1 )
00288 {
00289 if( ssl->ciphers[i] == 0 )
00290 {
00291 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
00292 return( XYSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
00293 }
00294 
00295 if( ssl->ciphers[i++] == ssl->session->cipher )
00296 break;
00297 }
00298 
00299 if( buf[41 + n] != SSL_COMPRESS_NULL )
00300 {
00301 SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
00302 return( XYSSL_ERR_SSL_BAD_HS_SERVER_HELLO );
00303 }
00304 
00305 // TODO: Process extensions
00306 
00307 SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
00308 
00309 return( 0 );
00310 }
00311 
00312 static int ssl_parse_server_key_exchange( ssl_context *ssl )
00313 {
00314 int ret, n;
00315 unsigned char *p, *end;
00316 unsigned char hash[36];
00317 md5_context md5;
00318 sha1_context sha1;
00319 
00320 SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) );
00321 
00322 if( ssl->session->cipher != SSL_EDH_RSA_DES_168_SHA &&
00323 ssl->session->cipher != SSL_EDH_RSA_AES_256_SHA )
00324 {
00325 SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
00326 ssl->state++;
00327 return( 0 );
00328 }
00329 
00330 #if !defined(XYSSL_DHM_C)
00331 SSL_DEBUG_MSG( 1, ( "support for dhm in not available" ) );
00332 return( XYSSL_ERR_SSL_FEATURE_UNAVAILABLE );
00333 #else
00334 if( ( ret = ssl_read_record( ssl ) ) != 0 )
00335 {
00336 SSL_DEBUG_RET( 1, "ssl_read_record", ret );
00337 return( ret );
00338 }
00339 
00340 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
00341 {
00342 SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
00343 return( XYSSL_ERR_SSL_UNEXPECTED_MESSAGE );
00344 }
00345 
00346 if( ssl->in_msg[0] != SSL_HS_SERVER_KEY_EXCHANGE )
00347 {
00348 SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
00349 return( XYSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
00350 }
00351 
00352 /*
00353  * Ephemeral DH parameters:
00354  *
00355  * struct {
00356  * opaque dh_p<1..2^16-1>;
00357  * opaque dh_g<1..2^16-1>;
00358  * opaque dh_Ys<1..2^16-1>;
00359  * } ServerDHParams;
00360  */
00361 p = ssl->in_msg + 4;
00362 end = ssl->in_msg + ssl->in_hslen;
00363 
00364 if( ( ret = dhm_read_params( &ssl->dhm_ctx, &p, end ) ) != 0 )
00365 {
00366 SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
00367 return( XYSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
00368 }
00369 
00370 if( (int)( end - p ) != ssl->peer_cert->rsa.len )
00371 {
00372 SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
00373 return( XYSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
00374 }
00375 
00376 if( ssl->dhm_ctx.len < 64 || ssl->dhm_ctx.len > 256 )
00377 {
00378 SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
00379 return( XYSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
00380 }
00381 
00382 SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->dhm_ctx.P );
00383 SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->dhm_ctx.G );
00384 SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->dhm_ctx.GY );
00385 
00386 /*
00387  * digitally-signed struct {
00388  * opaque md5_hash[16];
00389  * opaque sha_hash[20];
00390  * };
00391  *
00392  * md5_hash
00393  * MD5(ClientHello.random + ServerHello.random
00394  * + ServerParams);
00395  * sha_hash
00396  * SHA(ClientHello.random + ServerHello.random
00397  * + ServerParams);
00398  */
00399 n = ssl->in_hslen - ( end - p ) - 6;
00400 
00401 md5_starts( &md5 );
00402 md5_update( &md5, ssl->randbytes, 64 );
00403 md5_update( &md5, ssl->in_msg + 4, n );
00404 md5_finish( &md5, hash );
00405 
00406 sha1_starts( &sha1 );
00407 sha1_update( &sha1, ssl->randbytes, 64 );
00408 sha1_update( &sha1, ssl->in_msg + 4, n );
00409 sha1_finish( &sha1, hash + 16 );
00410 
00411 SSL_DEBUG_BUF( 3, "parameters hash", hash, 36 );
00412 
00413 if( ( ret = rsa_pkcs1_verify( &ssl->peer_cert->rsa, RSA_PUBLIC,
00414 RSA_RAW, 36, hash, p ) ) != 0 )
00415 {
00416 SSL_DEBUG_RET( 1, "rsa_pkcs1_verify", ret );
00417 return( ret );
00418 }
00419 
00420 ssl->state++;
00421 
00422 SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) );
00423 
00424 return( 0 );
00425 #endif
00426 }
00427 
00428 static int ssl_parse_certificate_request( ssl_context *ssl )
00429 {
00430 int ret;
00431 
00432 SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
00433 
00434 /*
00435  * 0 . 0 handshake type
00436  * 1 . 3 handshake length
00437  * 4 . 5 SSL version
00438  * 6 . 6 cert type count
00439  * 7 .. n-1 cert types
00440  * n .. n+1 length of all DNs
00441  * n+2 .. n+3 length of DN 1
00442  * n+4 .. ... Distinguished Name #1
00443  * ... .. ... length of DN 2, etc.
00444  */
00445 if( ( ret = ssl_read_record( ssl ) ) != 0 )
00446 {
00447 SSL_DEBUG_RET( 1, "ssl_read_record", ret );
00448 return( ret );
00449 }
00450 
00451 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
00452 {
00453 SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
00454 return( XYSSL_ERR_SSL_UNEXPECTED_MESSAGE );
00455 }
00456 
00457 ssl->client_auth = 0;
00458 ssl->state++;
00459 
00460 if( ssl->in_msg[0] == SSL_HS_CERTIFICATE_REQUEST )
00461 ssl->client_auth++;
00462 
00463 SSL_DEBUG_MSG( 3, ( "got %s certificate request",
00464 ssl->client_auth ? "a" : "no" ) );
00465 
00466 SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) );
00467 
00468 return( 0 );
00469 }
00470 
00471 static int ssl_parse_server_hello_done( ssl_context *ssl )
00472 {
00473 int ret;
00474 
00475 SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) );
00476 
00477 if( ssl->client_auth != 0 )
00478 {
00479 if( ( ret = ssl_read_record( ssl ) ) != 0 )
00480 {
00481 SSL_DEBUG_RET( 1, "ssl_read_record", ret );
00482 return( ret );
00483 }
00484 
00485 if( ssl->in_msgtype != SSL_MSG_HANDSHAKE )
00486 {
00487 SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
00488 return( XYSSL_ERR_SSL_UNEXPECTED_MESSAGE );
00489 }
00490 }
00491 
00492 if( ssl->in_hslen != 4 ||
00493 ssl->in_msg[0] != SSL_HS_SERVER_HELLO_DONE )
00494 {
00495 SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
00496 return( XYSSL_ERR_SSL_BAD_HS_SERVER_HELLO_DONE );
00497 }
00498 
00499 ssl->state++;
00500 
00501 SSL_DEBUG_MSG( 2, ( "<= parse server hello done" ) );
00502 
00503 return( 0 );
00504 }
00505 
00506 static int ssl_write_client_key_exchange( ssl_context *ssl )
00507 {
00508 int ret, i, n;
00509 
00510 SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) );
00511 
00512 if( ssl->session->cipher == SSL_EDH_RSA_DES_168_SHA ||
00513 ssl->session->cipher == SSL_EDH_RSA_AES_256_SHA )
00514 {
00515 #if !defined(XYSSL_DHM_C)
00516 SSL_DEBUG_MSG( 1, ( "support for dhm in not available" ) );
00517 return( XYSSL_ERR_SSL_FEATURE_UNAVAILABLE );
00518 #else
00519 /*
00520  * DHM key exchange -- send G^X mod P
00521  */
00522 n = ssl->dhm_ctx.len;
00523 
00524 ssl->out_msg[4] = (unsigned char)( n >> 8 );
00525 ssl->out_msg[5] = (unsigned char)( n );
00526 i = 6;
00527 
00528 ret = dhm_make_public( &ssl->dhm_ctx, 256,
00529 &ssl->out_msg[i], n,
00530 ssl->f_rng, ssl->p_rng );
00531 if( ret != 0 )
00532 {
00533 SSL_DEBUG_RET( 1, "dhm_make_public", ret );
00534 return( ret );
00535 }
00536 
00537 SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->dhm_ctx.X );
00538 SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->dhm_ctx.GX );
00539 
00540 ssl->pmslen = ssl->dhm_ctx.len;
00541 
00542 if( ( ret = dhm_calc_secret( &ssl->dhm_ctx,
00543 ssl->premaster,
00544 &ssl->pmslen ) ) != 0 )
00545 {
00546 SSL_DEBUG_RET( 1, "dhm_calc_secret", ret );
00547 return( ret );
00548 }
00549 
00550 SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->dhm_ctx.K );
00551 #endif
00552 }
00553 else
00554 {
00555 /*
00556  * RSA key exchange -- send rsa_public(pkcs1 v1.5(premaster))
00557  */
00558 ssl->premaster[0] = (unsigned char) ssl->max_major_ver;
00559 ssl->premaster[1] = (unsigned char) ssl->max_minor_ver;
00560 ssl->pmslen = 48;
00561 
00562 for( i = 2; i < ssl->pmslen; i++ )
00563 ssl->premaster[i] = (unsigned char) ssl->f_rng( ssl->p_rng );
00564 
00565 i = 4;
00566 n = ssl->peer_cert->rsa.len;
00567 
00568 if( ssl->minor_ver != SSL_MINOR_VERSION_0 )
00569 {
00570 i += 2;
00571 ssl->out_msg[4] = (unsigned char)( n >> 8 );
00572 ssl->out_msg[5] = (unsigned char)( n );
00573 }
00574 
00575 ret = rsa_pkcs1_encrypt( &ssl->peer_cert->rsa, RSA_PUBLIC,
00576 ssl->pmslen, ssl->premaster,
00577 ssl->out_msg + i );
00578 if( ret != 0 )
00579 {
00580 SSL_DEBUG_RET( 1, "rsa_pkcs1_encrypt", ret );
00581 return( ret );
00582 }
00583 }
00584 
00585 ssl_derive_keys( ssl );
00586 
00587 ssl->out_msglen = i + n;
00588 ssl->out_msgtype = SSL_MSG_HANDSHAKE;
00589 ssl->out_msg[0] = SSL_HS_CLIENT_KEY_EXCHANGE;
00590 
00591 ssl->state++;
00592 
00593 if( ( ret = ssl_write_record( ssl ) ) != 0 )
00594 {
00595 SSL_DEBUG_RET( 1, "ssl_write_record", ret );
00596 return( ret );
00597 }
00598 
00599 SSL_DEBUG_MSG( 2, ( "<= write client key exchange" ) );
00600 
00601 return( 0 );
00602 }
00603 
00604 static int ssl_write_certificate_verify( ssl_context *ssl )
00605 {
00606 int ret, n;
00607 unsigned char hash[36];
00608 
00609 SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
00610 
00611 if( ssl->client_auth == 0 )
00612 {
00613 SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
00614 ssl->state++;
00615 return( 0 );
00616 }
00617 
00618 if( ssl->rsa_key == NULL )
00619 {
00620 SSL_DEBUG_MSG( 1, ( "got no private key" ) );
00621 return( XYSSL_ERR_SSL_PRIVATE_KEY_REQUIRED );
00622 }
00623 
00624 /*
00625  * Make an RSA signature of the handshake digests
00626  */
00627 ssl_calc_verify( ssl, hash );
00628 
00629 n = ssl->rsa_key->len;
00630 ssl->out_msg[4] = (unsigned char)( n >> 8 );
00631 ssl->out_msg[5] = (unsigned char)( n );
00632 
00633 if( ( ret = rsa_pkcs1_sign( ssl->rsa_key, RSA_PRIVATE, RSA_RAW,
00634 36, hash, ssl->out_msg + 6 ) ) != 0 )
00635 {
00636 SSL_DEBUG_RET( 1, "rsa_pkcs1_sign", ret );
00637 return( ret );
00638 }
00639 
00640 ssl->out_msglen = 6 + n;
00641 ssl->out_msgtype = SSL_MSG_HANDSHAKE;
00642 ssl->out_msg[0] = SSL_HS_CERTIFICATE_VERIFY;
00643 
00644 ssl->state++;
00645 
00646 if( ( ret = ssl_write_record( ssl ) ) != 0 )
00647 {
00648 SSL_DEBUG_RET( 1, "ssl_write_record", ret );
00649 return( ret );
00650 }
00651 
00652 SSL_DEBUG_MSG( 2, ( "<= write certificate verify" ) );
00653 
00654 return( 0 );
00655 }
00656 
00657 /*
00658  * SSL handshake -- client side
00659  */
00660 int ssl_handshake_client( ssl_context *ssl )
00661 {
00662 int ret = 0;
00663 
00664 SSL_DEBUG_MSG( 2, ( "=> handshake client" ) );
00665 
00666 while( ssl->state != SSL_HANDSHAKE_OVER )
00667 {
00668 SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) );
00669 
00670 if( ( ret = ssl_flush_output( ssl ) ) != 0 )
00671 break;
00672 
00673 switch( ssl->state )
00674 {
00675 case SSL_HELLO_REQUEST:
00676 ssl->state = SSL_CLIENT_HELLO;
00677 break;
00678 
00679 /*
00680  * ==> ClientHello
00681  */
00682 case SSL_CLIENT_HELLO:
00683 ret = ssl_write_client_hello( ssl );
00684 break;
00685 
00686 /*
00687  * <== ServerHello
00688  * Certificate
00689  * ( ServerKeyExchange )
00690  * ( CertificateRequest )
00691  * ServerHelloDone
00692  */
00693 case SSL_SERVER_HELLO:
00694 ret = ssl_parse_server_hello( ssl );
00695 break;
00696 
00697 case SSL_SERVER_CERTIFICATE:
00698 ret = ssl_parse_certificate( ssl );
00699 break;
00700 
00701 case SSL_SERVER_KEY_EXCHANGE:
00702 ret = ssl_parse_server_key_exchange( ssl );
00703 break;
00704 
00705 case SSL_CERTIFICATE_REQUEST:
00706 ret = ssl_parse_certificate_request( ssl );
00707 break;
00708 
00709 case SSL_SERVER_HELLO_DONE:
00710 ret = ssl_parse_server_hello_done( ssl );
00711 break;
00712 
00713 /*
00714  * ==> ( Certificate/Alert )
00715  * ClientKeyExchange
00716  * ( CertificateVerify )
00717  * ChangeCipherSpec
00718  * Finished
00719  */
00720 case SSL_CLIENT_CERTIFICATE:
00721 ret = ssl_write_certificate( ssl );
00722 break;
00723 
00724 case SSL_CLIENT_KEY_EXCHANGE:
00725 ret = ssl_write_client_key_exchange( ssl );
00726 break;
00727 
00728 case SSL_CERTIFICATE_VERIFY:
00729 ret = ssl_write_certificate_verify( ssl );
00730 break;
00731 
00732 case SSL_CLIENT_CHANGE_CIPHER_SPEC:
00733 ret = ssl_write_change_cipher_spec( ssl );
00734 break;
00735 
00736 case SSL_CLIENT_FINISHED:
00737 ret = ssl_write_finished( ssl );
00738 break;
00739 
00740 /*
00741  * <== ChangeCipherSpec
00742  * Finished
00743  */
00744 case SSL_SERVER_CHANGE_CIPHER_SPEC:
00745 ret = ssl_parse_change_cipher_spec( ssl );
00746 break;
00747 
00748 case SSL_SERVER_FINISHED:
00749 ret = ssl_parse_finished( ssl );
00750 break;
00751 
00752 case SSL_FLUSH_BUFFERS:
00753 SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
00754 ssl->state = SSL_HANDSHAKE_OVER;
00755 break;
00756 
00757 default:
00758 SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
00759 return( XYSSL_ERR_SSL_BAD_INPUT_DATA );
00760 }
00761 
00762 if( ret != 0 )
00763 break;
00764 }
00765 
00766 SSL_DEBUG_MSG( 2, ( "<= handshake client" ) );
00767 
00768 return( ret );
00769 }
00770 
00771 #endif

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