s23_clnt.c revision 273399
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 } 273 274/* Fill a ClientRandom or ServerRandom field of length len. Returns <= 0 275 * on failure, 1 on success. */ 276int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len) 277 { 278 int send_time = 0; 279 280 if (len < 4) 281 return 0; 282 if (server) 283 send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0; 284 else 285 send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0; 286 if (send_time) 287 { 288 unsigned long Time = (unsigned long)time(NULL); 289 unsigned char *p = result; 290 l2n(Time, p); 291 return RAND_pseudo_bytes(p, len-4); 292 } 293 else 294 return RAND_pseudo_bytes(result, len); 295 } 296 297static int ssl23_client_hello(SSL *s) 298 { 299 unsigned char *buf; 300 unsigned char *p,*d; 301 int i,ch_len; 302 unsigned long l; 303 int ssl2_compat; 304 int version = 0, version_major, version_minor; 305#ifndef OPENSSL_NO_COMP 306 int j; 307 SSL_COMP *comp; 308#endif 309 int ret; 310 unsigned long mask, options = s->options; 311 312 ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1; 313 314 if (ssl2_compat && ssl23_no_ssl2_ciphers(s)) 315 ssl2_compat = 0; 316 317 /* 318 * SSL_OP_NO_X disables all protocols above X *if* there are 319 * some protocols below X enabled. This is required in order 320 * to maintain "version capability" vector contiguous. So 321 * that if application wants to disable TLS1.0 in favour of 322 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the 323 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. 324 */ 325 mask = SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1 326#if !defined(OPENSSL_NO_SSL3) 327 |SSL_OP_NO_SSLv3 328#endif 329#if !defined(OPENSSL_NO_SSL2) 330 |(ssl2_compat?SSL_OP_NO_SSLv2:0) 331#endif 332 ; 333#if !defined(OPENSSL_NO_TLS1_2_CLIENT) 334 version = TLS1_2_VERSION; 335 336 if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask) 337 version = TLS1_1_VERSION; 338#else 339 version = TLS1_1_VERSION; 340#endif 341 mask &= ~SSL_OP_NO_TLSv1_1; 342 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask) 343 version = TLS1_VERSION; 344 mask &= ~SSL_OP_NO_TLSv1; 345#if !defined(OPENSSL_NO_SSL3) 346 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask) 347 version = SSL3_VERSION; 348 mask &= ~SSL_OP_NO_SSLv3; 349#endif 350#if !defined(OPENSSL_NO_SSL2) 351 if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask) 352 version = SSL2_VERSION; 353#endif 354 355#ifndef OPENSSL_NO_TLSEXT 356 if (version != SSL2_VERSION) 357 { 358 /* have to disable SSL 2.0 compatibility if we need TLS extensions */ 359 360 if (s->tlsext_hostname != NULL) 361 ssl2_compat = 0; 362 if (s->tlsext_status_type != -1) 363 ssl2_compat = 0; 364#ifdef TLSEXT_TYPE_opaque_prf_input 365 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL) 366 ssl2_compat = 0; 367#endif 368 } 369#endif 370 371 buf=(unsigned char *)s->init_buf->data; 372 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 373 { 374#if 0 375 /* don't reuse session-id's */ 376 if (!ssl_get_new_session(s,0)) 377 { 378 return(-1); 379 } 380#endif 381 382 p=s->s3->client_random; 383 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0) 384 return -1; 385 386 if (version == TLS1_2_VERSION) 387 { 388 version_major = TLS1_2_VERSION_MAJOR; 389 version_minor = TLS1_2_VERSION_MINOR; 390 } 391 else if (version == TLS1_1_VERSION) 392 { 393 version_major = TLS1_1_VERSION_MAJOR; 394 version_minor = TLS1_1_VERSION_MINOR; 395 } 396 else if (version == TLS1_VERSION) 397 { 398 version_major = TLS1_VERSION_MAJOR; 399 version_minor = TLS1_VERSION_MINOR; 400 } 401#ifdef OPENSSL_FIPS 402 else if(FIPS_mode()) 403 { 404 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 405 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 406 return -1; 407 } 408#endif 409 else if (version == SSL3_VERSION) 410 { 411 version_major = SSL3_VERSION_MAJOR; 412 version_minor = SSL3_VERSION_MINOR; 413 } 414 else if (version == SSL2_VERSION) 415 { 416 version_major = SSL2_VERSION_MAJOR; 417 version_minor = SSL2_VERSION_MINOR; 418 } 419 else 420 { 421 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 422 return(-1); 423 } 424 425 s->client_version = version; 426 427 if (ssl2_compat) 428 { 429 /* create SSL 2.0 compatible Client Hello */ 430 431 /* two byte record header will be written last */ 432 d = &(buf[2]); 433 p = d + 9; /* leave space for message type, version, individual length fields */ 434 435 *(d++) = SSL2_MT_CLIENT_HELLO; 436 *(d++) = version_major; 437 *(d++) = version_minor; 438 439 /* Ciphers supported */ 440 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); 441 if (i == 0) 442 { 443 /* no ciphers */ 444 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 445 return -1; 446 } 447 s2n(i,d); 448 p+=i; 449 450 /* put in the session-id length (zero since there is no reuse) */ 451#if 0 452 s->session->session_id_length=0; 453#endif 454 s2n(0,d); 455 456 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 457 ch_len=SSL2_CHALLENGE_LENGTH; 458 else 459 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 460 461 /* write out sslv2 challenge */ 462 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), 463 because it is one of SSL2_MAX_CHALLENGE_LENGTH (32) 464 or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the 465 check in for futurproofing */ 466 if (SSL3_RANDOM_SIZE < ch_len) 467 i=SSL3_RANDOM_SIZE; 468 else 469 i=ch_len; 470 s2n(i,d); 471 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); 472 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0) 473 return -1; 474 475 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 476 p+=i; 477 478 i= p- &(buf[2]); 479 buf[0]=((i>>8)&0xff)|0x80; 480 buf[1]=(i&0xff); 481 482 /* number of bytes to write */ 483 s->init_num=i+2; 484 s->init_off=0; 485 486 ssl3_finish_mac(s,&(buf[2]),i); 487 } 488 else 489 { 490 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 491 492 /* do the record header (5 bytes) and handshake message header (4 bytes) last */ 493 d = p = &(buf[9]); 494 495 *(p++) = version_major; 496 *(p++) = version_minor; 497 498 /* Random stuff */ 499 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 500 p += SSL3_RANDOM_SIZE; 501 502 /* Session ID (zero since there is no reuse) */ 503 *(p++) = 0; 504 505 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 506 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); 507 if (i == 0) 508 { 509 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 510 return -1; 511 } 512#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 513 /* Some servers hang if client hello > 256 bytes 514 * as hack workaround chop number of supported ciphers 515 * to keep it well below this if we use TLS v1.2 516 */ 517 if (TLS1_get_version(s) >= TLS1_2_VERSION 518 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) 519 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; 520#endif 521 s2n(i,p); 522 p+=i; 523 524 /* COMPRESSION */ 525#ifdef OPENSSL_NO_COMP 526 *(p++)=1; 527#else 528 if ((s->options & SSL_OP_NO_COMPRESSION) 529 || !s->ctx->comp_methods) 530 j=0; 531 else 532 j=sk_SSL_COMP_num(s->ctx->comp_methods); 533 *(p++)=1+j; 534 for (i=0; i<j; i++) 535 { 536 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 537 *(p++)=comp->id; 538 } 539#endif 540 *(p++)=0; /* Add the NULL method */ 541 542#ifndef OPENSSL_NO_TLSEXT 543 /* TLS extensions*/ 544 if (ssl_prepare_clienthello_tlsext(s) <= 0) 545 { 546 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); 547 return -1; 548 } 549 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 550 { 551 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 552 return -1; 553 } 554#endif 555 556 l = p-d; 557 558 /* fill in 4-byte handshake header */ 559 d=&(buf[5]); 560 *(d++)=SSL3_MT_CLIENT_HELLO; 561 l2n3(l,d); 562 563 l += 4; 564 565 if (l > SSL3_RT_MAX_PLAIN_LENGTH) 566 { 567 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 568 return -1; 569 } 570 571 /* fill in 5-byte record header */ 572 d=buf; 573 *(d++) = SSL3_RT_HANDSHAKE; 574 *(d++) = version_major; 575 /* Some servers hang if we use long client hellos 576 * and a record number > TLS 1.0. 577 */ 578 if (TLS1_get_client_version(s) > TLS1_VERSION) 579 *(d++) = 1; 580 else 581 *(d++) = version_minor; 582 s2n((int)l,d); 583 584 /* number of bytes to write */ 585 s->init_num=p-buf; 586 s->init_off=0; 587 588 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); 589 } 590 591 s->state=SSL23_ST_CW_CLNT_HELLO_B; 592 s->init_off=0; 593 } 594 595 /* SSL3_ST_CW_CLNT_HELLO_B */ 596 ret = ssl23_write_bytes(s); 597 598 if ((ret >= 2) && s->msg_callback) 599 { 600 /* Client Hello has been sent; tell msg_callback */ 601 602 if (ssl2_compat) 603 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); 604 else 605 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); 606 } 607 608 return ret; 609 } 610 611static int ssl23_get_server_hello(SSL *s) 612 { 613 char buf[8]; 614 unsigned char *p; 615 int i; 616 int n; 617 618 n=ssl23_read_bytes(s,7); 619 620 if (n != 7) return(n); 621 p=s->packet; 622 623 memcpy(buf,p,n); 624 625 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 626 (p[5] == 0x00) && (p[6] == 0x02)) 627 { 628#ifdef OPENSSL_NO_SSL2 629 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 630 goto err; 631#else 632 /* we are talking sslv2 */ 633 /* we need to clean up the SSLv3 setup and put in the 634 * sslv2 stuff. */ 635 int ch_len; 636 637 if (s->options & SSL_OP_NO_SSLv2) 638 { 639 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 640 goto err; 641 } 642 if (s->s2 == NULL) 643 { 644 if (!ssl2_new(s)) 645 goto err; 646 } 647 else 648 ssl2_clear(s); 649 650 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 651 ch_len=SSL2_CHALLENGE_LENGTH; 652 else 653 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 654 655 /* write out sslv2 challenge */ 656 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because 657 it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or 658 SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for 659 futurproofing */ 660 i=(SSL3_RANDOM_SIZE < ch_len) 661 ?SSL3_RANDOM_SIZE:ch_len; 662 s->s2->challenge_length=i; 663 memcpy(s->s2->challenge, 664 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 665 666 if (s->s3 != NULL) ssl3_free(s); 667 668 if (!BUF_MEM_grow_clean(s->init_buf, 669 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 670 { 671 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); 672 goto err; 673 } 674 675 s->state=SSL2_ST_GET_SERVER_HELLO_A; 676 if (!(s->client_version == SSL2_VERSION)) 677 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 678 s->s2->ssl2_rollback=1; 679 680 /* setup the 7 bytes we have read so we get them from 681 * the sslv2 buffer */ 682 s->rstate=SSL_ST_READ_HEADER; 683 s->packet_length=n; 684 s->packet= &(s->s2->rbuf[0]); 685 memcpy(s->packet,buf,n); 686 s->s2->rbuf_left=n; 687 s->s2->rbuf_offs=0; 688 689 /* we have already written one */ 690 s->s2->write_sequence=1; 691 692 s->method=SSLv2_client_method(); 693 s->handshake_func=s->method->ssl_connect; 694#endif 695 } 696 else if (p[1] == SSL3_VERSION_MAJOR && 697 p[2] <= TLS1_2_VERSION_MINOR && 698 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 699 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) 700 { 701 /* we have sslv3 or tls1 (server hello or alert) */ 702 703#ifndef OPENSSL_NO_SSL3 704 if ((p[2] == SSL3_VERSION_MINOR) && 705 !(s->options & SSL_OP_NO_SSLv3)) 706 { 707#ifdef OPENSSL_FIPS 708 if(FIPS_mode()) 709 { 710 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, 711 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 712 goto err; 713 } 714#endif 715 s->version=SSL3_VERSION; 716 s->method=SSLv3_client_method(); 717 } 718 else 719#endif 720 if ((p[2] == TLS1_VERSION_MINOR) && 721 !(s->options & SSL_OP_NO_TLSv1)) 722 { 723 s->version=TLS1_VERSION; 724 s->method=TLSv1_client_method(); 725 } 726 else if ((p[2] == TLS1_1_VERSION_MINOR) && 727 !(s->options & SSL_OP_NO_TLSv1_1)) 728 { 729 s->version=TLS1_1_VERSION; 730 s->method=TLSv1_1_client_method(); 731 } 732 else if ((p[2] == TLS1_2_VERSION_MINOR) && 733 !(s->options & SSL_OP_NO_TLSv1_2)) 734 { 735 s->version=TLS1_2_VERSION; 736 s->method=TLSv1_2_client_method(); 737 } 738 else 739 { 740 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 741 goto err; 742 } 743 744 /* ensure that TLS_MAX_VERSION is up-to-date */ 745 OPENSSL_assert(s->version <= TLS_MAX_VERSION); 746 747 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) 748 { 749 /* fatal alert */ 750 751 void (*cb)(const SSL *ssl,int type,int val)=NULL; 752 int j; 753 754 if (s->info_callback != NULL) 755 cb=s->info_callback; 756 else if (s->ctx->info_callback != NULL) 757 cb=s->ctx->info_callback; 758 759 i=p[5]; 760 if (cb != NULL) 761 { 762 j=(i<<8)|p[6]; 763 cb(s,SSL_CB_READ_ALERT,j); 764 } 765 766 if (s->msg_callback) 767 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg); 768 769 s->rwstate=SSL_NOTHING; 770 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 771 goto err; 772 } 773 774 if (!ssl_init_wbio_buffer(s,1)) goto err; 775 776 /* we are in this state */ 777 s->state=SSL3_ST_CR_SRVR_HELLO_A; 778 779 /* put the 7 bytes we have read into the input buffer 780 * for SSLv3 */ 781 s->rstate=SSL_ST_READ_HEADER; 782 s->packet_length=n; 783 if (s->s3->rbuf.buf == NULL) 784 if (!ssl3_setup_read_buffer(s)) 785 goto err; 786 s->packet= &(s->s3->rbuf.buf[0]); 787 memcpy(s->packet,buf,n); 788 s->s3->rbuf.left=n; 789 s->s3->rbuf.offset=0; 790 791 s->handshake_func=s->method->ssl_connect; 792 } 793 else 794 { 795 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 796 goto err; 797 } 798 s->init_num=0; 799 800 /* Since, if we are sending a ssl23 client hello, we are not 801 * reusing a session-id */ 802 if (!ssl_get_new_session(s,0)) 803 goto err; 804 805 return(SSL_connect(s)); 806err: 807 return(-1); 808 } 809