s23_clnt.c revision 273415
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 if (ver == TLS1_1_VERSION) 135 return(TLSv1_1_client_method()); 136 else if (ver == TLS1_2_VERSION) 137 return(TLSv1_2_client_method()); 138 else 139 return(NULL); 140 } 141 142IMPLEMENT_ssl23_meth_func(SSLv23_client_method, 143 ssl_undefined_function, 144 ssl23_connect, 145 ssl23_get_client_method) 146 147int ssl23_connect(SSL *s) 148 { 149 BUF_MEM *buf=NULL; 150 unsigned long Time=(unsigned long)time(NULL); 151 void (*cb)(const SSL *ssl,int type,int val)=NULL; 152 int ret= -1; 153 int new_state,state; 154 155 RAND_add(&Time,sizeof(Time),0); 156 ERR_clear_error(); 157 clear_sys_error(); 158 159 if (s->info_callback != NULL) 160 cb=s->info_callback; 161 else if (s->ctx->info_callback != NULL) 162 cb=s->ctx->info_callback; 163 164 s->in_handshake++; 165 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 166 167 for (;;) 168 { 169 state=s->state; 170 171 switch(s->state) 172 { 173 case SSL_ST_BEFORE: 174 case SSL_ST_CONNECT: 175 case SSL_ST_BEFORE|SSL_ST_CONNECT: 176 case SSL_ST_OK|SSL_ST_CONNECT: 177 178 if (s->session != NULL) 179 { 180 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE); 181 ret= -1; 182 goto end; 183 } 184 s->server=0; 185 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 186 187 /* s->version=TLS1_VERSION; */ 188 s->type=SSL_ST_CONNECT; 189 190 if (s->init_buf == NULL) 191 { 192 if ((buf=BUF_MEM_new()) == NULL) 193 { 194 ret= -1; 195 goto end; 196 } 197 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 198 { 199 ret= -1; 200 goto end; 201 } 202 s->init_buf=buf; 203 buf=NULL; 204 } 205 206 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 207 208 ssl3_init_finished_mac(s); 209 210 s->state=SSL23_ST_CW_CLNT_HELLO_A; 211 s->ctx->stats.sess_connect++; 212 s->init_num=0; 213 break; 214 215 case SSL23_ST_CW_CLNT_HELLO_A: 216 case SSL23_ST_CW_CLNT_HELLO_B: 217 218 s->shutdown=0; 219 ret=ssl23_client_hello(s); 220 if (ret <= 0) goto end; 221 s->state=SSL23_ST_CR_SRVR_HELLO_A; 222 s->init_num=0; 223 224 break; 225 226 case SSL23_ST_CR_SRVR_HELLO_A: 227 case SSL23_ST_CR_SRVR_HELLO_B: 228 ret=ssl23_get_server_hello(s); 229 if (ret >= 0) cb=NULL; 230 goto end; 231 /* break; */ 232 233 default: 234 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE); 235 ret= -1; 236 goto end; 237 /* break; */ 238 } 239 240 if (s->debug) { (void)BIO_flush(s->wbio); } 241 242 if ((cb != NULL) && (s->state != state)) 243 { 244 new_state=s->state; 245 s->state=state; 246 cb(s,SSL_CB_CONNECT_LOOP,1); 247 s->state=new_state; 248 } 249 } 250end: 251 s->in_handshake--; 252 if (buf != NULL) 253 BUF_MEM_free(buf); 254 if (cb != NULL) 255 cb(s,SSL_CB_CONNECT_EXIT,ret); 256 return(ret); 257 } 258 259static int ssl23_no_ssl2_ciphers(SSL *s) 260 { 261 SSL_CIPHER *cipher; 262 STACK_OF(SSL_CIPHER) *ciphers; 263 int i; 264 ciphers = SSL_get_ciphers(s); 265 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) 266 { 267 cipher = sk_SSL_CIPHER_value(ciphers, i); 268 if (cipher->algorithm_ssl == SSL_SSLV2) 269 return 0; 270 } 271 return 1; 272 } 273 274static int ssl23_client_hello(SSL *s) 275 { 276 unsigned char *buf; 277 unsigned char *p,*d; 278 int i,ch_len; 279 unsigned long Time,l; 280 int ssl2_compat; 281 int version = 0, version_major, version_minor; 282#ifndef OPENSSL_NO_COMP 283 int j; 284 SSL_COMP *comp; 285#endif 286 int ret; 287 unsigned long mask, options = s->options; 288 289 ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1; 290 291 if (ssl2_compat && ssl23_no_ssl2_ciphers(s)) 292 ssl2_compat = 0; 293 294 /* 295 * SSL_OP_NO_X disables all protocols above X *if* there are 296 * some protocols below X enabled. This is required in order 297 * to maintain "version capability" vector contiguous. So 298 * that if application wants to disable TLS1.0 in favour of 299 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the 300 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. 301 */ 302 mask = SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1 303#if !defined(OPENSSL_NO_SSL3) 304 |SSL_OP_NO_SSLv3 305#endif 306#if !defined(OPENSSL_NO_SSL2) 307 |(ssl2_compat?SSL_OP_NO_SSLv2:0) 308#endif 309 ; 310#if !defined(OPENSSL_NO_TLS1_2_CLIENT) 311 version = TLS1_2_VERSION; 312 313 if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask) 314 version = TLS1_1_VERSION; 315#else 316 version = TLS1_1_VERSION; 317#endif 318 mask &= ~SSL_OP_NO_TLSv1_1; 319 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask) 320 version = TLS1_VERSION; 321 mask &= ~SSL_OP_NO_TLSv1; 322#if !defined(OPENSSL_NO_SSL3) 323 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask) 324 version = SSL3_VERSION; 325 mask &= ~SSL_OP_NO_SSLv3; 326#endif 327#if !defined(OPENSSL_NO_SSL2) 328 if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask) 329 version = SSL2_VERSION; 330#endif 331 332#ifndef OPENSSL_NO_TLSEXT 333 if (version != SSL2_VERSION) 334 { 335 /* have to disable SSL 2.0 compatibility if we need TLS extensions */ 336 337 if (s->tlsext_hostname != NULL) 338 ssl2_compat = 0; 339 if (s->tlsext_status_type != -1) 340 ssl2_compat = 0; 341#ifdef TLSEXT_TYPE_opaque_prf_input 342 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL) 343 ssl2_compat = 0; 344#endif 345 } 346#endif 347 348 buf=(unsigned char *)s->init_buf->data; 349 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 350 { 351#if 0 352 /* don't reuse session-id's */ 353 if (!ssl_get_new_session(s,0)) 354 { 355 return(-1); 356 } 357#endif 358 359 p=s->s3->client_random; 360 Time=(unsigned long)time(NULL); /* Time */ 361 l2n(Time,p); 362 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0) 363 return -1; 364 365 if (version == TLS1_2_VERSION) 366 { 367 version_major = TLS1_2_VERSION_MAJOR; 368 version_minor = TLS1_2_VERSION_MINOR; 369 } 370 else if (version == TLS1_1_VERSION) 371 { 372 version_major = TLS1_1_VERSION_MAJOR; 373 version_minor = TLS1_1_VERSION_MINOR; 374 } 375 else if (version == TLS1_VERSION) 376 { 377 version_major = TLS1_VERSION_MAJOR; 378 version_minor = TLS1_VERSION_MINOR; 379 } 380#ifdef OPENSSL_FIPS 381 else if(FIPS_mode()) 382 { 383 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 384 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 385 return -1; 386 } 387#endif 388 else if (version == SSL3_VERSION) 389 { 390 version_major = SSL3_VERSION_MAJOR; 391 version_minor = SSL3_VERSION_MINOR; 392 } 393 else if (version == SSL2_VERSION) 394 { 395 version_major = SSL2_VERSION_MAJOR; 396 version_minor = SSL2_VERSION_MINOR; 397 } 398 else 399 { 400 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 401 return(-1); 402 } 403 404 s->client_version = version; 405 406 if (ssl2_compat) 407 { 408 /* create SSL 2.0 compatible Client Hello */ 409 410 /* two byte record header will be written last */ 411 d = &(buf[2]); 412 p = d + 9; /* leave space for message type, version, individual length fields */ 413 414 *(d++) = SSL2_MT_CLIENT_HELLO; 415 *(d++) = version_major; 416 *(d++) = version_minor; 417 418 /* Ciphers supported */ 419 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); 420 if (i == 0) 421 { 422 /* no ciphers */ 423 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 424 return -1; 425 } 426 s2n(i,d); 427 p+=i; 428 429 /* put in the session-id length (zero since there is no reuse) */ 430#if 0 431 s->session->session_id_length=0; 432#endif 433 s2n(0,d); 434 435 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 436 ch_len=SSL2_CHALLENGE_LENGTH; 437 else 438 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 439 440 /* write out sslv2 challenge */ 441 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), 442 because it is one of SSL2_MAX_CHALLENGE_LENGTH (32) 443 or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the 444 check in for futurproofing */ 445 if (SSL3_RANDOM_SIZE < ch_len) 446 i=SSL3_RANDOM_SIZE; 447 else 448 i=ch_len; 449 s2n(i,d); 450 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); 451 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0) 452 return -1; 453 454 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 455 p+=i; 456 457 i= p- &(buf[2]); 458 buf[0]=((i>>8)&0xff)|0x80; 459 buf[1]=(i&0xff); 460 461 /* number of bytes to write */ 462 s->init_num=i+2; 463 s->init_off=0; 464 465 ssl3_finish_mac(s,&(buf[2]),i); 466 } 467 else 468 { 469 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 470 471 /* do the record header (5 bytes) and handshake message header (4 bytes) last */ 472 d = p = &(buf[9]); 473 474 *(p++) = version_major; 475 *(p++) = version_minor; 476 477 /* Random stuff */ 478 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 479 p += SSL3_RANDOM_SIZE; 480 481 /* Session ID (zero since there is no reuse) */ 482 *(p++) = 0; 483 484 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 485 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); 486 if (i == 0) 487 { 488 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 489 return -1; 490 } 491#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 492 /* Some servers hang if client hello > 256 bytes 493 * as hack workaround chop number of supported ciphers 494 * to keep it well below this if we use TLS v1.2 495 */ 496 if (TLS1_get_version(s) >= TLS1_2_VERSION 497 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) 498 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; 499#endif 500 s2n(i,p); 501 p+=i; 502 503 /* COMPRESSION */ 504#ifdef OPENSSL_NO_COMP 505 *(p++)=1; 506#else 507 if ((s->options & SSL_OP_NO_COMPRESSION) 508 || !s->ctx->comp_methods) 509 j=0; 510 else 511 j=sk_SSL_COMP_num(s->ctx->comp_methods); 512 *(p++)=1+j; 513 for (i=0; i<j; i++) 514 { 515 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 516 *(p++)=comp->id; 517 } 518#endif 519 *(p++)=0; /* Add the NULL method */ 520 521#ifndef OPENSSL_NO_TLSEXT 522 /* TLS extensions*/ 523 if (ssl_prepare_clienthello_tlsext(s) <= 0) 524 { 525 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); 526 return -1; 527 } 528 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 529 { 530 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 531 return -1; 532 } 533#endif 534 535 l = p-d; 536 537 /* fill in 4-byte handshake header */ 538 d=&(buf[5]); 539 *(d++)=SSL3_MT_CLIENT_HELLO; 540 l2n3(l,d); 541 542 l += 4; 543 544 if (l > SSL3_RT_MAX_PLAIN_LENGTH) 545 { 546 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 547 return -1; 548 } 549 550 /* fill in 5-byte record header */ 551 d=buf; 552 *(d++) = SSL3_RT_HANDSHAKE; 553 *(d++) = version_major; 554 /* Some servers hang if we use long client hellos 555 * and a record number > TLS 1.0. 556 */ 557 if (TLS1_get_client_version(s) > TLS1_VERSION) 558 *(d++) = 1; 559 else 560 *(d++) = version_minor; 561 s2n((int)l,d); 562 563 /* number of bytes to write */ 564 s->init_num=p-buf; 565 s->init_off=0; 566 567 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); 568 } 569 570 s->state=SSL23_ST_CW_CLNT_HELLO_B; 571 s->init_off=0; 572 } 573 574 /* SSL3_ST_CW_CLNT_HELLO_B */ 575 ret = ssl23_write_bytes(s); 576 577 if ((ret >= 2) && s->msg_callback) 578 { 579 /* Client Hello has been sent; tell msg_callback */ 580 581 if (ssl2_compat) 582 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); 583 else 584 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); 585 } 586 587 return ret; 588 } 589 590static int ssl23_get_server_hello(SSL *s) 591 { 592 char buf[8]; 593 unsigned char *p; 594 int i; 595 int n; 596 597 n=ssl23_read_bytes(s,7); 598 599 if (n != 7) return(n); 600 p=s->packet; 601 602 memcpy(buf,p,n); 603 604 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 605 (p[5] == 0x00) && (p[6] == 0x02)) 606 { 607#ifdef OPENSSL_NO_SSL2 608 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 609 goto err; 610#else 611 /* we are talking sslv2 */ 612 /* we need to clean up the SSLv3 setup and put in the 613 * sslv2 stuff. */ 614 int ch_len; 615 616 if (s->options & SSL_OP_NO_SSLv2) 617 { 618 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 619 goto err; 620 } 621 if (s->s2 == NULL) 622 { 623 if (!ssl2_new(s)) 624 goto err; 625 } 626 else 627 ssl2_clear(s); 628 629 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 630 ch_len=SSL2_CHALLENGE_LENGTH; 631 else 632 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 633 634 /* write out sslv2 challenge */ 635 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because 636 it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or 637 SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for 638 futurproofing */ 639 i=(SSL3_RANDOM_SIZE < ch_len) 640 ?SSL3_RANDOM_SIZE:ch_len; 641 s->s2->challenge_length=i; 642 memcpy(s->s2->challenge, 643 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 644 645 if (s->s3 != NULL) ssl3_free(s); 646 647 if (!BUF_MEM_grow_clean(s->init_buf, 648 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 649 { 650 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); 651 goto err; 652 } 653 654 s->state=SSL2_ST_GET_SERVER_HELLO_A; 655 if (!(s->client_version == SSL2_VERSION)) 656 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 657 s->s2->ssl2_rollback=1; 658 659 /* setup the 7 bytes we have read so we get them from 660 * the sslv2 buffer */ 661 s->rstate=SSL_ST_READ_HEADER; 662 s->packet_length=n; 663 s->packet= &(s->s2->rbuf[0]); 664 memcpy(s->packet,buf,n); 665 s->s2->rbuf_left=n; 666 s->s2->rbuf_offs=0; 667 668 /* we have already written one */ 669 s->s2->write_sequence=1; 670 671 s->method=SSLv2_client_method(); 672 s->handshake_func=s->method->ssl_connect; 673#endif 674 } 675 else if (p[1] == SSL3_VERSION_MAJOR && 676 p[2] <= TLS1_2_VERSION_MINOR && 677 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 678 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) 679 { 680 /* we have sslv3 or tls1 (server hello or alert) */ 681 682#ifndef OPENSSL_NO_SSL3 683 if ((p[2] == SSL3_VERSION_MINOR) && 684 !(s->options & SSL_OP_NO_SSLv3)) 685 { 686#ifdef OPENSSL_FIPS 687 if(FIPS_mode()) 688 { 689 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, 690 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 691 goto err; 692 } 693#endif 694 s->version=SSL3_VERSION; 695 s->method=SSLv3_client_method(); 696 } 697 else 698#endif 699 if ((p[2] == TLS1_VERSION_MINOR) && 700 !(s->options & SSL_OP_NO_TLSv1)) 701 { 702 s->version=TLS1_VERSION; 703 s->method=TLSv1_client_method(); 704 } 705 else if ((p[2] == TLS1_1_VERSION_MINOR) && 706 !(s->options & SSL_OP_NO_TLSv1_1)) 707 { 708 s->version=TLS1_1_VERSION; 709 s->method=TLSv1_1_client_method(); 710 } 711 else if ((p[2] == TLS1_2_VERSION_MINOR) && 712 !(s->options & SSL_OP_NO_TLSv1_2)) 713 { 714 s->version=TLS1_2_VERSION; 715 s->method=TLSv1_2_client_method(); 716 } 717 else 718 { 719 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 720 goto err; 721 } 722 723 /* ensure that TLS_MAX_VERSION is up-to-date */ 724 OPENSSL_assert(s->version <= TLS_MAX_VERSION); 725 726 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) 727 { 728 /* fatal alert */ 729 730 void (*cb)(const SSL *ssl,int type,int val)=NULL; 731 int j; 732 733 if (s->info_callback != NULL) 734 cb=s->info_callback; 735 else if (s->ctx->info_callback != NULL) 736 cb=s->ctx->info_callback; 737 738 i=p[5]; 739 if (cb != NULL) 740 { 741 j=(i<<8)|p[6]; 742 cb(s,SSL_CB_READ_ALERT,j); 743 } 744 745 if (s->msg_callback) 746 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg); 747 748 s->rwstate=SSL_NOTHING; 749 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 750 goto err; 751 } 752 753 if (!ssl_init_wbio_buffer(s,1)) goto err; 754 755 /* we are in this state */ 756 s->state=SSL3_ST_CR_SRVR_HELLO_A; 757 758 /* put the 7 bytes we have read into the input buffer 759 * for SSLv3 */ 760 s->rstate=SSL_ST_READ_HEADER; 761 s->packet_length=n; 762 if (s->s3->rbuf.buf == NULL) 763 if (!ssl3_setup_read_buffer(s)) 764 goto err; 765 s->packet= &(s->s3->rbuf.buf[0]); 766 memcpy(s->packet,buf,n); 767 s->s3->rbuf.left=n; 768 s->s3->rbuf.offset=0; 769 770 s->handshake_func=s->method->ssl_connect; 771 } 772 else 773 { 774 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 775 goto err; 776 } 777 s->init_num=0; 778 779 /* Since, if we are sending a ssl23 client hello, we are not 780 * reusing a session-id */ 781 if (!ssl_get_new_session(s,0)) 782 goto err; 783 784 return(SSL_connect(s)); 785err: 786 return(-1); 787 } 788