1/* ssl/s23_clnt.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@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@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@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@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@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@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@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 119static const SSL_METHOD *ssl23_get_client_method(int ver); 120static int ssl23_client_hello(SSL *s); 121static int ssl23_get_server_hello(SSL *s); 122static 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#ifndef OPENSSL_NO_SSL3 129 if (ver == SSL3_VERSION) 130 return(SSLv3_client_method()); 131#endif 132 if (ver == TLS1_VERSION) 133 return(TLSv1_client_method()); 134 else 135 return(NULL); 136 } 137 138IMPLEMENT_ssl23_meth_func(SSLv23_client_method, 139 ssl_undefined_function, 140 ssl23_connect, 141 ssl23_get_client_method) 142 143int ssl23_connect(SSL *s) 144 { 145 BUF_MEM *buf=NULL; 146 unsigned long Time=(unsigned long)time(NULL); 147 void (*cb)(const SSL *ssl,int type,int val)=NULL; 148 int ret= -1; 149 int new_state,state; 150 151 RAND_add(&Time,sizeof(Time),0); 152 ERR_clear_error(); 153 clear_sys_error(); 154 155 if (s->info_callback != NULL) 156 cb=s->info_callback; 157 else if (s->ctx->info_callback != NULL) 158 cb=s->ctx->info_callback; 159 160 s->in_handshake++; 161 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 162 163 for (;;) 164 { 165 state=s->state; 166 167 switch(s->state) 168 { 169 case SSL_ST_BEFORE: 170 case SSL_ST_CONNECT: 171 case SSL_ST_BEFORE|SSL_ST_CONNECT: 172 case SSL_ST_OK|SSL_ST_CONNECT: 173 174 if (s->session != NULL) 175 { 176 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE); 177 ret= -1; 178 goto end; 179 } 180 s->server=0; 181 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 182 183 /* s->version=TLS1_VERSION; */ 184 s->type=SSL_ST_CONNECT; 185 186 if (s->init_buf == NULL) 187 { 188 if ((buf=BUF_MEM_new()) == NULL) 189 { 190 ret= -1; 191 goto end; 192 } 193 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 194 { 195 ret= -1; 196 goto end; 197 } 198 s->init_buf=buf; 199 buf=NULL; 200 } 201 202 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 203 204 ssl3_init_finished_mac(s); 205 206 s->state=SSL23_ST_CW_CLNT_HELLO_A; 207 s->ctx->stats.sess_connect++; 208 s->init_num=0; 209 break; 210 211 case SSL23_ST_CW_CLNT_HELLO_A: 212 case SSL23_ST_CW_CLNT_HELLO_B: 213 214 s->shutdown=0; 215 ret=ssl23_client_hello(s); 216 if (ret <= 0) goto end; 217 s->state=SSL23_ST_CR_SRVR_HELLO_A; 218 s->init_num=0; 219 220 break; 221 222 case SSL23_ST_CR_SRVR_HELLO_A: 223 case SSL23_ST_CR_SRVR_HELLO_B: 224 ret=ssl23_get_server_hello(s); 225 if (ret >= 0) cb=NULL; 226 goto end; 227 /* break; */ 228 229 default: 230 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE); 231 ret= -1; 232 goto end; 233 /* break; */ 234 } 235 236 if (s->debug) { (void)BIO_flush(s->wbio); } 237 238 if ((cb != NULL) && (s->state != state)) 239 { 240 new_state=s->state; 241 s->state=state; 242 cb(s,SSL_CB_CONNECT_LOOP,1); 243 s->state=new_state; 244 } 245 } 246end: 247 s->in_handshake--; 248 if (buf != NULL) 249 BUF_MEM_free(buf); 250 if (cb != NULL) 251 cb(s,SSL_CB_CONNECT_EXIT,ret); 252 return(ret); 253 } 254 255static int ssl23_no_ssl2_ciphers(SSL *s) 256 { 257 SSL_CIPHER *cipher; 258 STACK_OF(SSL_CIPHER) *ciphers; 259 int i; 260 ciphers = SSL_get_ciphers(s); 261 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) 262 { 263 cipher = sk_SSL_CIPHER_value(ciphers, i); 264 if (cipher->algorithm_ssl == SSL_SSLV2) 265 return 0; 266 } 267 return 1; 268 } 269 270static int ssl23_client_hello(SSL *s) 271 { 272 unsigned char *buf; 273 unsigned char *p,*d; 274 int i,ch_len; 275 unsigned long Time,l; 276 int ssl2_compat; 277 int version = 0, version_major, version_minor; 278#ifndef OPENSSL_NO_COMP 279 int j; 280 SSL_COMP *comp; 281#endif 282 int ret; 283 284 ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1; 285 286 if (ssl2_compat && ssl23_no_ssl2_ciphers(s)) 287 ssl2_compat = 0; 288 289 if (!(s->options & SSL_OP_NO_TLSv1)) 290 { 291 version = TLS1_VERSION; 292 } 293 else if (!(s->options & SSL_OP_NO_SSLv3)) 294 { 295 version = SSL3_VERSION; 296 } 297 else if (!(s->options & SSL_OP_NO_SSLv2)) 298 { 299 version = SSL2_VERSION; 300 } 301#ifndef OPENSSL_NO_TLSEXT 302 if (version != SSL2_VERSION) 303 { 304 /* have to disable SSL 2.0 compatibility if we need TLS extensions */ 305 306 if (s->tlsext_hostname != NULL) 307 ssl2_compat = 0; 308 if (s->tlsext_status_type != -1) 309 ssl2_compat = 0; 310#ifdef TLSEXT_TYPE_opaque_prf_input 311 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL) 312 ssl2_compat = 0; 313#endif 314 } 315#endif 316 317 buf=(unsigned char *)s->init_buf->data; 318 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 319 { 320#if 0 321 /* don't reuse session-id's */ 322 if (!ssl_get_new_session(s,0)) 323 { 324 return(-1); 325 } 326#endif 327 328 p=s->s3->client_random; 329 Time=(unsigned long)time(NULL); /* Time */ 330 l2n(Time,p); 331 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0) 332 return -1; 333 334 if (version == TLS1_VERSION) 335 { 336 version_major = TLS1_VERSION_MAJOR; 337 version_minor = TLS1_VERSION_MINOR; 338 } 339 else if (version == SSL3_VERSION) 340 { 341 version_major = SSL3_VERSION_MAJOR; 342 version_minor = SSL3_VERSION_MINOR; 343 } 344 else if (version == SSL2_VERSION) 345 { 346 version_major = SSL2_VERSION_MAJOR; 347 version_minor = SSL2_VERSION_MINOR; 348 } 349 else 350 { 351 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 352 return(-1); 353 } 354 355 s->client_version = version; 356 357 if (ssl2_compat) 358 { 359 /* create SSL 2.0 compatible Client Hello */ 360 361 /* two byte record header will be written last */ 362 d = &(buf[2]); 363 p = d + 9; /* leave space for message type, version, individual length fields */ 364 365 *(d++) = SSL2_MT_CLIENT_HELLO; 366 *(d++) = version_major; 367 *(d++) = version_minor; 368 369 /* Ciphers supported */ 370 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); 371 if (i == 0) 372 { 373 /* no ciphers */ 374 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 375 return -1; 376 } 377 s2n(i,d); 378 p+=i; 379 380 /* put in the session-id length (zero since there is no reuse) */ 381#if 0 382 s->session->session_id_length=0; 383#endif 384 s2n(0,d); 385 386 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 387 ch_len=SSL2_CHALLENGE_LENGTH; 388 else 389 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 390 391 /* write out sslv2 challenge */ 392 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), 393 because it is one of SSL2_MAX_CHALLENGE_LENGTH (32) 394 or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the 395 check in for futurproofing */ 396 if (SSL3_RANDOM_SIZE < ch_len) 397 i=SSL3_RANDOM_SIZE; 398 else 399 i=ch_len; 400 s2n(i,d); 401 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); 402 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0) 403 return -1; 404 405 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 406 p+=i; 407 408 i= p- &(buf[2]); 409 buf[0]=((i>>8)&0xff)|0x80; 410 buf[1]=(i&0xff); 411 412 /* number of bytes to write */ 413 s->init_num=i+2; 414 s->init_off=0; 415 416 ssl3_finish_mac(s,&(buf[2]),i); 417 } 418 else 419 { 420 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 421 422 /* do the record header (5 bytes) and handshake message header (4 bytes) last */ 423 d = p = &(buf[9]); 424 425 *(p++) = version_major; 426 *(p++) = version_minor; 427 428 /* Random stuff */ 429 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 430 p += SSL3_RANDOM_SIZE; 431 432 /* Session ID (zero since there is no reuse) */ 433 *(p++) = 0; 434 435 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 436 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); 437 if (i == 0) 438 { 439 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 440 return -1; 441 } 442 s2n(i,p); 443 p+=i; 444 445 /* COMPRESSION */ 446#ifdef OPENSSL_NO_COMP 447 *(p++)=1; 448#else 449 if ((s->options & SSL_OP_NO_COMPRESSION) 450 || !s->ctx->comp_methods) 451 j=0; 452 else 453 j=sk_SSL_COMP_num(s->ctx->comp_methods); 454 *(p++)=1+j; 455 for (i=0; i<j; i++) 456 { 457 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 458 *(p++)=comp->id; 459 } 460#endif 461 *(p++)=0; /* Add the NULL method */ 462 463#ifndef OPENSSL_NO_TLSEXT 464 /* TLS extensions*/ 465 if (ssl_prepare_clienthello_tlsext(s) <= 0) 466 { 467 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); 468 return -1; 469 } 470 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 471 { 472 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 473 return -1; 474 } 475#endif 476 477 l = p-d; 478 479 /* fill in 4-byte handshake header */ 480 d=&(buf[5]); 481 *(d++)=SSL3_MT_CLIENT_HELLO; 482 l2n3(l,d); 483 484 l += 4; 485 486 if (l > SSL3_RT_MAX_PLAIN_LENGTH) 487 { 488 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 489 return -1; 490 } 491 492 /* fill in 5-byte record header */ 493 d=buf; 494 *(d++) = SSL3_RT_HANDSHAKE; 495 *(d++) = version_major; 496 *(d++) = version_minor; /* arguably we should send the *lowest* suported version here 497 * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */ 498 s2n((int)l,d); 499 500 /* number of bytes to write */ 501 s->init_num=p-buf; 502 s->init_off=0; 503 504 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); 505 } 506 507 s->state=SSL23_ST_CW_CLNT_HELLO_B; 508 s->init_off=0; 509 } 510 511 /* SSL3_ST_CW_CLNT_HELLO_B */ 512 ret = ssl23_write_bytes(s); 513 514 if ((ret >= 2) && s->msg_callback) 515 { 516 /* Client Hello has been sent; tell msg_callback */ 517 518 if (ssl2_compat) 519 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); 520 else 521 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); 522 } 523 524 return ret; 525 } 526 527static int ssl23_get_server_hello(SSL *s) 528 { 529 char buf[8]; 530 unsigned char *p; 531 int i; 532 int n; 533 534 n=ssl23_read_bytes(s,7); 535 536 if (n != 7) return(n); 537 p=s->packet; 538 539 memcpy(buf,p,n); 540 541 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 542 (p[5] == 0x00) && (p[6] == 0x02)) 543 { 544#ifdef OPENSSL_NO_SSL2 545 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 546 goto err; 547#else 548 /* we are talking sslv2 */ 549 /* we need to clean up the SSLv3 setup and put in the 550 * sslv2 stuff. */ 551 int ch_len; 552 553 if (s->options & SSL_OP_NO_SSLv2) 554 { 555 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 556 goto err; 557 } 558 if (s->s2 == NULL) 559 { 560 if (!ssl2_new(s)) 561 goto err; 562 } 563 else 564 ssl2_clear(s); 565 566 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 567 ch_len=SSL2_CHALLENGE_LENGTH; 568 else 569 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 570 571 /* write out sslv2 challenge */ 572 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because 573 it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or 574 SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for 575 futurproofing */ 576 i=(SSL3_RANDOM_SIZE < ch_len) 577 ?SSL3_RANDOM_SIZE:ch_len; 578 s->s2->challenge_length=i; 579 memcpy(s->s2->challenge, 580 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 581 582 if (s->s3 != NULL) ssl3_free(s); 583 584 if (!BUF_MEM_grow_clean(s->init_buf, 585 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 586 { 587 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); 588 goto err; 589 } 590 591 s->state=SSL2_ST_GET_SERVER_HELLO_A; 592 if (!(s->client_version == SSL2_VERSION)) 593 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 594 s->s2->ssl2_rollback=1; 595 596 /* setup the 7 bytes we have read so we get them from 597 * the sslv2 buffer */ 598 s->rstate=SSL_ST_READ_HEADER; 599 s->packet_length=n; 600 s->packet= &(s->s2->rbuf[0]); 601 memcpy(s->packet,buf,n); 602 s->s2->rbuf_left=n; 603 s->s2->rbuf_offs=0; 604 605 /* we have already written one */ 606 s->s2->write_sequence=1; 607 608 s->method=SSLv2_client_method(); 609 s->handshake_func=s->method->ssl_connect; 610#endif 611 } 612 else if (p[1] == SSL3_VERSION_MAJOR && 613 (p[2] == SSL3_VERSION_MINOR || p[2] == TLS1_VERSION_MINOR) && 614 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 615 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) 616 { 617 /* we have sslv3 or tls1 (server hello or alert) */ 618 619#ifndef OPENSSL_NO_SSL3 620 if ((p[2] == SSL3_VERSION_MINOR) && 621 !(s->options & SSL_OP_NO_SSLv3)) 622 { 623 s->version=SSL3_VERSION; 624 s->method=SSLv3_client_method(); 625 } 626 else 627#endif 628 if ((p[2] == TLS1_VERSION_MINOR) && 629 !(s->options & SSL_OP_NO_TLSv1)) 630 { 631 s->version=TLS1_VERSION; 632 s->method=TLSv1_client_method(); 633 } 634 else 635 { 636 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 637 goto err; 638 } 639 640 /* ensure that TLS_MAX_VERSION is up-to-date */ 641 OPENSSL_assert(s->version <= TLS_MAX_VERSION); 642 643 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) 644 { 645 /* fatal alert */ 646 647 void (*cb)(const SSL *ssl,int type,int val)=NULL; 648 int j; 649 650 if (s->info_callback != NULL) 651 cb=s->info_callback; 652 else if (s->ctx->info_callback != NULL) 653 cb=s->ctx->info_callback; 654 655 i=p[5]; 656 if (cb != NULL) 657 { 658 j=(i<<8)|p[6]; 659 cb(s,SSL_CB_READ_ALERT,j); 660 } 661 662 if (s->msg_callback) 663 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg); 664 665 s->rwstate=SSL_NOTHING; 666 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 667 goto err; 668 } 669 670 if (!ssl_init_wbio_buffer(s,1)) goto err; 671 672 /* we are in this state */ 673 s->state=SSL3_ST_CR_SRVR_HELLO_A; 674 675 /* put the 7 bytes we have read into the input buffer 676 * for SSLv3 */ 677 s->rstate=SSL_ST_READ_HEADER; 678 s->packet_length=n; 679 if (s->s3->rbuf.buf == NULL) 680 if (!ssl3_setup_read_buffer(s)) 681 goto err; 682 s->packet= &(s->s3->rbuf.buf[0]); 683 memcpy(s->packet,buf,n); 684 s->s3->rbuf.left=n; 685 s->s3->rbuf.offset=0; 686 687 s->handshake_func=s->method->ssl_connect; 688 } 689 else 690 { 691 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 692 goto err; 693 } 694 s->init_num=0; 695 696 /* Since, if we are sending a ssl23 client hello, we are not 697 * reusing a session-id */ 698 if (!ssl_get_new_session(s,0)) 699 goto err; 700 701 return(SSL_connect(s)); 702err: 703 return(-1); 704 } 705