1 /* ssl/s23_clnt.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay (at) cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core (at) openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay (at) cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh (at) cryptsoft.com). 109 * 110 */ 111 112 #include <stdio.h> 113 #include "ssl_locl.h" 114 #include <openssl/buffer.h> 115 #include <openssl/rand.h> 116 #include <openssl/objects.h> 117 #include <openssl/evp.h> 118 119 static const SSL_METHOD *ssl23_get_client_method(int ver); 120 static int ssl23_client_hello(SSL *s); 121 static int ssl23_get_server_hello(SSL *s); 122 static const SSL_METHOD *ssl23_get_client_method(int ver) 123 { 124 #ifndef OPENSSL_NO_SSL2 125 if (ver == SSL2_VERSION) 126 return(SSLv2_client_method()); 127 #endif 128 if (ver == SSL3_VERSION) 129 return(SSLv3_client_method()); 130 else if (ver == TLS1_VERSION) 131 return(TLSv1_client_method()); 132 else 133 return(NULL); 134 } 135 136 IMPLEMENT_ssl23_meth_func(SSLv23_client_method, 137 ssl_undefined_function, 138 ssl23_connect, 139 ssl23_get_client_method) 140 141 int ssl23_connect(SSL *s) 142 { 143 BUF_MEM *buf=NULL; 144 unsigned long Time=(unsigned long)time(NULL); 145 void (*cb)(const SSL *ssl,int type,int val)=NULL; 146 int ret= -1; 147 int new_state,state; 148 149 RAND_add(&Time,sizeof(Time),0); 150 ERR_clear_error(); 151 clear_sys_error(); 152 153 if (s->info_callback != NULL) 154 cb=s->info_callback; 155 else if (s->ctx->info_callback != NULL) 156 cb=s->ctx->info_callback; 157 158 s->in_handshake++; 159 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 160 161 for (;;) 162 { 163 state=s->state; 164 165 switch(s->state) 166 { 167 case SSL_ST_BEFORE: 168 case SSL_ST_CONNECT: 169 case SSL_ST_BEFORE|SSL_ST_CONNECT: 170 case SSL_ST_OK|SSL_ST_CONNECT: 171 172 if (s->session != NULL) 173 { 174 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE); 175 ret= -1; 176 goto end; 177 } 178 s->server=0; 179 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 180 181 /* s->version=TLS1_VERSION; */ 182 s->type=SSL_ST_CONNECT; 183 184 if (s->init_buf == NULL) 185 { 186 if ((buf=BUF_MEM_new()) == NULL) 187 { 188 ret= -1; 189 goto end; 190 } 191 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 192 { 193 ret= -1; 194 goto end; 195 } 196 s->init_buf=buf; 197 buf=NULL; 198 } 199 200 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 201 202 ssl3_init_finished_mac(s); 203 204 s->state=SSL23_ST_CW_CLNT_HELLO_A; 205 s->ctx->stats.sess_connect++; 206 s->init_num=0; 207 break; 208 209 case SSL23_ST_CW_CLNT_HELLO_A: 210 case SSL23_ST_CW_CLNT_HELLO_B: 211 212 s->shutdown=0; 213 ret=ssl23_client_hello(s); 214 if (ret <= 0) goto end; 215 s->state=SSL23_ST_CR_SRVR_HELLO_A; 216 s->init_num=0; 217 218 break; 219 220 case SSL23_ST_CR_SRVR_HELLO_A: 221 case SSL23_ST_CR_SRVR_HELLO_B: 222 ret=ssl23_get_server_hello(s); 223 if (ret >= 0) cb=NULL; 224 goto end; 225 /* break; */ 226 227 default: 228 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE); 229 ret= -1; 230 goto end; 231 /* break; */ 232 } 233 234 if (s->debug) { (void)BIO_flush(s->wbio); } 235 236 if ((cb != NULL) && (s->state != state)) 237 { 238 new_state=s->state; 239 s->state=state; 240 cb(s,SSL_CB_CONNECT_LOOP,1); 241 s->state=new_state; 242 } 243 } 244 end: 245 s->in_handshake--; 246 if (buf != NULL) 247 BUF_MEM_free(buf); 248 if (cb != NULL) 249 cb(s,SSL_CB_CONNECT_EXIT,ret); 250 return(ret); 251 } 252 253 static int ssl23_no_ssl2_ciphers(SSL *s) 254 { 255 SSL_CIPHER *cipher; 256 STACK_OF(SSL_CIPHER) *ciphers; 257 int i; 258 ciphers = SSL_get_ciphers(s); 259 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) 260 { 261 cipher = sk_SSL_CIPHER_value(ciphers, i); 262 if (cipher->algorithm_ssl == SSL_SSLV2) 263 return 0; 264 } 265 return 1; 266 } 267 268 static int ssl23_client_hello(SSL *s) 269 { 270 unsigned char *buf; 271 unsigned char *p,*d; 272 int i,ch_len; 273 unsigned long Time,l; 274 int ssl2_compat; 275 int version = 0, version_major, version_minor; 276 #ifndef OPENSSL_NO_COMP 277 int j; 278 SSL_COMP *comp; 279 #endif 280 int ret; 281 282 ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1; 283 284 if (ssl2_compat && ssl23_no_ssl2_ciphers(s)) 285 ssl2_compat = 0; 286 287 if (!(s->options & SSL_OP_NO_TLSv1)) 288 { 289 version = TLS1_VERSION; 290 } 291 else if (!(s->options & SSL_OP_NO_SSLv3)) 292 { 293 version = SSL3_VERSION; 294 } 295 else if (!(s->options & SSL_OP_NO_SSLv2)) 296 { 297 version = SSL2_VERSION; 298 } 299 #ifndef OPENSSL_NO_TLSEXT 300 if (version != SSL2_VERSION) 301 { 302 /* have to disable SSL 2.0 compatibility if we need TLS extensions */ 303 304 if (s->tlsext_hostname != NULL) 305 ssl2_compat = 0; 306 if (s->tlsext_status_type != -1) 307 ssl2_compat = 0; 308 #ifdef TLSEXT_TYPE_opaque_prf_input 309 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL) 310 ssl2_compat = 0; 311 #endif 312 } 313 #endif 314 315 buf=(unsigned char *)s->init_buf->data; 316 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 317 { 318 #if 0 319 /* don't reuse session-id's */ 320 if (!ssl_get_new_session(s,0)) 321 { 322 return(-1); 323 } 324 #endif 325 326 p=s->s3->client_random; 327 Time=(unsigned long)time(NULL); /* Time */ 328 l2n(Time,p); 329 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0) 330 return -1; 331 332 if (version == TLS1_VERSION) 333 { 334 version_major = TLS1_VERSION_MAJOR; 335 version_minor = TLS1_VERSION_MINOR; 336 } 337 else if (version == SSL3_VERSION) 338 { 339 version_major = SSL3_VERSION_MAJOR; 340 version_minor = SSL3_VERSION_MINOR; 341 } 342 else if (version == SSL2_VERSION) 343 { 344 version_major = SSL2_VERSION_MAJOR; 345 version_minor = SSL2_VERSION_MINOR; 346 } 347 else 348 { 349 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 350 return(-1); 351 } 352 353 s->client_version = version; 354 355 if (ssl2_compat) 356 { 357 /* create SSL 2.0 compatible Client Hello */ 358 359 /* two byte record header will be written last */ 360 d = &(buf[2]); 361 p = d + 9; /* leave space for message type, version, individual length fields */ 362 363 *(d++) = SSL2_MT_CLIENT_HELLO; 364 *(d++) = version_major; 365 *(d++) = version_minor; 366 367 /* Ciphers supported */ 368 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); 369 if (i == 0) 370 { 371 /* no ciphers */ 372 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 373 return -1; 374 } 375 s2n(i,d); 376 p+=i; 377 378 /* put in the session-id length (zero since there is no reuse) */ 379 #if 0 380 s->session->session_id_length=0; 381 #endif 382 s2n(0,d); 383 384 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 385 ch_len=SSL2_CHALLENGE_LENGTH; 386 else 387 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 388 389 /* write out sslv2 challenge */ 390 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), 391 because it is one of SSL2_MAX_CHALLENGE_LENGTH (32) 392 or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the 393 check in for futurproofing */ 394 if (SSL3_RANDOM_SIZE < ch_len) 395 i=SSL3_RANDOM_SIZE; 396 else 397 i=ch_len; 398 s2n(i,d); 399 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); 400 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0) 401 return -1; 402 403 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 404 p+=i; 405 406 i= p- &(buf[2]); 407 buf[0]=((i>>8)&0xff)|0x80; 408 buf[1]=(i&0xff); 409 410 /* number of bytes to write */ 411 s->init_num=i+2; 412 s->init_off=0; 413 414 ssl3_finish_mac(s,&(buf[2]),i); 415 } 416 else 417 { 418 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 419 420 /* do the record header (5 bytes) and handshake message header (4 bytes) last */ 421 d = p = &(buf[9]); 422 423 *(p++) = version_major; 424 *(p++) = version_minor; 425 426 /* Random stuff */ 427 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 428 p += SSL3_RANDOM_SIZE; 429 430 /* Session ID (zero since there is no reuse) */ 431 *(p++) = 0; 432 433 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 434 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); 435 if (i == 0) 436 { 437 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 438 return -1; 439 } 440 s2n(i,p); 441 p+=i; 442 443 /* COMPRESSION */ 444 #ifdef OPENSSL_NO_COMP 445 *(p++)=1; 446 #else 447 if ((s->options & SSL_OP_NO_COMPRESSION) 448 || !s->ctx->comp_methods) 449 j=0; 450 else 451 j=sk_SSL_COMP_num(s->ctx->comp_methods); 452 *(p++)=1+j; 453 for (i=0; i<j; i++) 454 { 455 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 456 *(p++)=comp->id; 457 } 458 #endif 459 *(p++)=0; /* Add the NULL method */ 460 461 #ifndef OPENSSL_NO_TLSEXT 462 /* TLS extensions*/ 463 if (ssl_prepare_clienthello_tlsext(s) <= 0) 464 { 465 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); 466 return -1; 467 } 468 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 469 { 470 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 471 return -1; 472 } 473 #endif 474 475 l = p-d; 476 477 /* fill in 4-byte handshake header */ 478 d=&(buf[5]); 479 *(d++)=SSL3_MT_CLIENT_HELLO; 480 l2n3(l,d); 481 482 l += 4; 483 484 if (l > SSL3_RT_MAX_PLAIN_LENGTH) 485 { 486 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 487 return -1; 488 } 489 490 /* fill in 5-byte record header */ 491 d=buf; 492 *(d++) = SSL3_RT_HANDSHAKE; 493 *(d++) = version_major; 494 *(d++) = version_minor; /* arguably we should send the *lowest* suported version here 495 * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */ 496 s2n((int)l,d); 497 498 /* number of bytes to write */ 499 s->init_num=p-buf; 500 s->init_off=0; 501 502 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); 503 } 504 505 s->state=SSL23_ST_CW_CLNT_HELLO_B; 506 s->init_off=0; 507 } 508 509 /* SSL3_ST_CW_CLNT_HELLO_B */ 510 ret = ssl23_write_bytes(s); 511 512 if ((ret >= 2) && s->msg_callback) 513 { 514 /* Client Hello has been sent; tell msg_callback */ 515 516 if (ssl2_compat) 517 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); 518 else 519 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); 520 } 521 522 return ret; 523 } 524 525 static int ssl23_get_server_hello(SSL *s) 526 { 527 char buf[8]; 528 unsigned char *p; 529 int i; 530 int n; 531 532 n=ssl23_read_bytes(s,7); 533 534 if (n != 7) return(n); 535 p=s->packet; 536 537 memcpy(buf,p,n); 538 539 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 540 (p[5] == 0x00) && (p[6] == 0x02)) 541 { 542 #ifdef OPENSSL_NO_SSL2 543 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 544 goto err; 545 #else 546 /* we are talking sslv2 */ 547 /* we need to clean up the SSLv3 setup and put in the 548 * sslv2 stuff. */ 549 int ch_len; 550 551 if (s->options & SSL_OP_NO_SSLv2) 552 { 553 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 554 goto err; 555 } 556 if (s->s2 == NULL) 557 { 558 if (!ssl2_new(s)) 559 goto err; 560 } 561 else 562 ssl2_clear(s); 563 564 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 565 ch_len=SSL2_CHALLENGE_LENGTH; 566 else 567 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 568 569 /* write out sslv2 challenge */ 570 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because 571 it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or 572 SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for 573 futurproofing */ 574 i=(SSL3_RANDOM_SIZE < ch_len) 575 ?SSL3_RANDOM_SIZE:ch_len; 576 s->s2->challenge_length=i; 577 memcpy(s->s2->challenge, 578 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 579 580 if (s->s3 != NULL) ssl3_free(s); 581 582 if (!BUF_MEM_grow_clean(s->init_buf, 583 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 584 { 585 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); 586 goto err; 587 } 588 589 s->state=SSL2_ST_GET_SERVER_HELLO_A; 590 if (!(s->client_version == SSL2_VERSION)) 591 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 592 s->s2->ssl2_rollback=1; 593 594 /* setup the 7 bytes we have read so we get them from 595 * the sslv2 buffer */ 596 s->rstate=SSL_ST_READ_HEADER; 597 s->packet_length=n; 598 s->packet= &(s->s2->rbuf[0]); 599 memcpy(s->packet,buf,n); 600 s->s2->rbuf_left=n; 601 s->s2->rbuf_offs=0; 602 603 /* we have already written one */ 604 s->s2->write_sequence=1; 605 606 s->method=SSLv2_client_method(); 607 s->handshake_func=s->method->ssl_connect; 608 #endif 609 } 610 else if (p[1] == SSL3_VERSION_MAJOR && 611 (p[2] == SSL3_VERSION_MINOR || p[2] == TLS1_VERSION_MINOR) && 612 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 613 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) 614 { 615 /* we have sslv3 or tls1 (server hello or alert) */ 616 617 if ((p[2] == SSL3_VERSION_MINOR) && 618 !(s->options & SSL_OP_NO_SSLv3)) 619 { 620 s->version=SSL3_VERSION; 621 s->method=SSLv3_client_method(); 622 } 623 else if ((p[2] == TLS1_VERSION_MINOR) && 624 !(s->options & SSL_OP_NO_TLSv1)) 625 { 626 s->version=TLS1_VERSION; 627 s->method=TLSv1_client_method(); 628 } 629 else 630 { 631 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 632 goto err; 633 } 634 635 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) 636 { 637 /* fatal alert */ 638 639 void (*cb)(const SSL *ssl,int type,int val)=NULL; 640 int j; 641 642 if (s->info_callback != NULL) 643 cb=s->info_callback; 644 else if (s->ctx->info_callback != NULL) 645 cb=s->ctx->info_callback; 646 647 i=p[5]; 648 if (cb != NULL) 649 { 650 j=(i<<8)|p[6]; 651 cb(s,SSL_CB_READ_ALERT,j); 652 } 653 654 if (s->msg_callback) 655 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg); 656 657 s->rwstate=SSL_NOTHING; 658 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 659 goto err; 660 } 661 662 if (!ssl_init_wbio_buffer(s,1)) goto err; 663 664 /* we are in this state */ 665 s->state=SSL3_ST_CR_SRVR_HELLO_A; 666 667 /* put the 7 bytes we have read into the input buffer 668 * for SSLv3 */ 669 s->rstate=SSL_ST_READ_HEADER; 670 s->packet_length=n; 671 if (s->s3->rbuf.buf == NULL) 672 if (!ssl3_setup_read_buffer(s)) 673 goto err; 674 s->packet= &(s->s3->rbuf.buf[0]); 675 memcpy(s->packet,buf,n); 676 s->s3->rbuf.left=n; 677 s->s3->rbuf.offset=0; 678 679 s->handshake_func=s->method->ssl_connect; 680 } 681 else 682 { 683 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 684 goto err; 685 } 686 s->init_num=0; 687 688 /* Since, if we are sending a ssl23 client hello, we are not 689 * reusing a session-id */ 690 if (!s->session_creation_enabled) 691 { 692 if (!(s->client_version == SSL2_VERSION)) 693 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 694 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED); 695 goto err; 696 } 697 if (!ssl_get_new_session(s,0)) 698 goto err; 699 700 return(SSL_connect(s)); 701 err: 702 return(-1); 703 } 704
