s23_clnt.c revision 296341
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, ssl23_get_client_method) 145 146int ssl23_connect(SSL *s) 147{ 148 BUF_MEM *buf = NULL; 149 unsigned long Time = (unsigned long)time(NULL); 150 void (*cb) (const SSL *ssl, int type, int val) = NULL; 151 int ret = -1; 152 int new_state, state; 153 154 RAND_add(&Time, sizeof(Time), 0); 155 ERR_clear_error(); 156 clear_sys_error(); 157 158 if (s->info_callback != NULL) 159 cb = s->info_callback; 160 else if (s->ctx->info_callback != NULL) 161 cb = s->ctx->info_callback; 162 163 s->in_handshake++; 164 if (!SSL_in_init(s) || SSL_in_before(s)) 165 SSL_clear(s); 166 167 for (;;) { 168 state = s->state; 169 170 switch (s->state) { 171 case SSL_ST_BEFORE: 172 case SSL_ST_CONNECT: 173 case SSL_ST_BEFORE | SSL_ST_CONNECT: 174 case SSL_ST_OK | SSL_ST_CONNECT: 175 176 if (s->session != NULL) { 177 SSLerr(SSL_F_SSL23_CONNECT, 178 SSL_R_SSL23_DOING_SESSION_ID_REUSE); 179 ret = -1; 180 goto end; 181 } 182 s->server = 0; 183 if (cb != NULL) 184 cb(s, SSL_CB_HANDSHAKE_START, 1); 185 186 /* s->version=TLS1_VERSION; */ 187 s->type = SSL_ST_CONNECT; 188 189 if (s->init_buf == NULL) { 190 if ((buf = BUF_MEM_new()) == NULL) { 191 ret = -1; 192 goto end; 193 } 194 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 195 ret = -1; 196 goto end; 197 } 198 s->init_buf = buf; 199 buf = NULL; 200 } 201 202 if (!ssl3_setup_buffers(s)) { 203 ret = -1; 204 goto end; 205 } 206 207 ssl3_init_finished_mac(s); 208 209 s->state = SSL23_ST_CW_CLNT_HELLO_A; 210 s->ctx->stats.sess_connect++; 211 s->init_num = 0; 212 break; 213 214 case SSL23_ST_CW_CLNT_HELLO_A: 215 case SSL23_ST_CW_CLNT_HELLO_B: 216 217 s->shutdown = 0; 218 ret = ssl23_client_hello(s); 219 if (ret <= 0) 220 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) 230 cb = NULL; 231 goto end; 232 /* break; */ 233 234 default: 235 SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE); 236 ret = -1; 237 goto end; 238 /* break; */ 239 } 240 241 if (s->debug) { 242 (void)BIO_flush(s->wbio); 243 } 244 245 if ((cb != NULL) && (s->state != state)) { 246 new_state = s->state; 247 s->state = state; 248 cb(s, SSL_CB_CONNECT_LOOP, 1); 249 s->state = new_state; 250 } 251 } 252 end: 253 s->in_handshake--; 254 if (buf != NULL) 255 BUF_MEM_free(buf); 256 if (cb != NULL) 257 cb(s, SSL_CB_CONNECT_EXIT, ret); 258 return (ret); 259} 260 261static int ssl23_no_ssl2_ciphers(SSL *s) 262{ 263 SSL_CIPHER *cipher; 264 STACK_OF(SSL_CIPHER) *ciphers; 265 int i; 266 ciphers = SSL_get_ciphers(s); 267 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 268 cipher = sk_SSL_CIPHER_value(ciphers, i); 269 if (cipher->algorithm_ssl == SSL_SSLV2) 270 return 0; 271 } 272 return 1; 273} 274 275/* 276 * Fill a ClientRandom or ServerRandom field of length len. Returns <= 0 on 277 * failure, 1 on success. 278 */ 279int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len) 280{ 281 int send_time = 0; 282 283 if (len < 4) 284 return 0; 285 if (server) 286 send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0; 287 else 288 send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0; 289 if (send_time) { 290 unsigned long Time = (unsigned long)time(NULL); 291 unsigned char *p = result; 292 l2n(Time, p); 293 return RAND_pseudo_bytes(p, len - 4); 294 } else 295 return RAND_pseudo_bytes(result, len); 296} 297 298static int ssl23_client_hello(SSL *s) 299{ 300 unsigned char *buf; 301 unsigned char *p, *d; 302 int i, ch_len; 303 unsigned long l; 304 int ssl2_compat; 305 int version = 0, version_major, version_minor; 306#ifndef OPENSSL_NO_COMP 307 int j; 308 SSL_COMP *comp; 309#endif 310 int ret; 311 unsigned long mask, options = s->options; 312 313 ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1; 314 315 if (ssl2_compat && ssl23_no_ssl2_ciphers(s)) 316 ssl2_compat = 0; 317 318 /* 319 * SSL_OP_NO_X disables all protocols above X *if* there are 320 * some protocols below X enabled. This is required in order 321 * to maintain "version capability" vector contiguous. So 322 * that if application wants to disable TLS1.0 in favour of 323 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the 324 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. 325 */ 326 mask = SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1 327#if !defined(OPENSSL_NO_SSL3) 328 | SSL_OP_NO_SSLv3 329#endif 330#if !defined(OPENSSL_NO_SSL2) 331 | (ssl2_compat ? SSL_OP_NO_SSLv2 : 0) 332#endif 333 ; 334#if !defined(OPENSSL_NO_TLS1_2_CLIENT) 335 version = TLS1_2_VERSION; 336 337 if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask) 338 version = TLS1_1_VERSION; 339#else 340 version = TLS1_1_VERSION; 341#endif 342 mask &= ~SSL_OP_NO_TLSv1_1; 343 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask) 344 version = TLS1_VERSION; 345 mask &= ~SSL_OP_NO_TLSv1; 346#if !defined(OPENSSL_NO_SSL3) 347 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask) 348 version = SSL3_VERSION; 349 mask &= ~SSL_OP_NO_SSLv3; 350#endif 351#if !defined(OPENSSL_NO_SSL2) 352 if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask) 353 version = SSL2_VERSION; 354#endif 355 356#ifndef OPENSSL_NO_TLSEXT 357 if (version != SSL2_VERSION) { 358 /* 359 * have to disable SSL 2.0 compatibility if we need TLS extensions 360 */ 361 362 if (s->tlsext_hostname != NULL) 363 ssl2_compat = 0; 364 if (s->tlsext_status_type != -1) 365 ssl2_compat = 0; 366# ifdef TLSEXT_TYPE_opaque_prf_input 367 if (s->ctx->tlsext_opaque_prf_input_callback != 0 368 || s->tlsext_opaque_prf_input != NULL) 369 ssl2_compat = 0; 370# endif 371 } 372#endif 373 374 buf = (unsigned char *)s->init_buf->data; 375 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) { 376#if 0 377 /* don't reuse session-id's */ 378 if (!ssl_get_new_session(s, 0)) { 379 return (-1); 380 } 381#endif 382 383 p = s->s3->client_random; 384 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0) 385 return -1; 386 387 if (version == TLS1_2_VERSION) { 388 version_major = TLS1_2_VERSION_MAJOR; 389 version_minor = TLS1_2_VERSION_MINOR; 390 } else if (version == TLS1_1_VERSION) { 391 version_major = TLS1_1_VERSION_MAJOR; 392 version_minor = TLS1_1_VERSION_MINOR; 393 } else if (version == TLS1_VERSION) { 394 version_major = TLS1_VERSION_MAJOR; 395 version_minor = TLS1_VERSION_MINOR; 396 } 397#ifdef OPENSSL_FIPS 398 else if (FIPS_mode()) { 399 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 400 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 401 return -1; 402 } 403#endif 404 else if (version == SSL3_VERSION) { 405 version_major = SSL3_VERSION_MAJOR; 406 version_minor = SSL3_VERSION_MINOR; 407 } else if (version == SSL2_VERSION) { 408 version_major = SSL2_VERSION_MAJOR; 409 version_minor = SSL2_VERSION_MINOR; 410 } else { 411 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_PROTOCOLS_AVAILABLE); 412 return (-1); 413 } 414 415 s->client_version = version; 416 417 if (ssl2_compat) { 418 /* create SSL 2.0 compatible Client Hello */ 419 420 /* two byte record header will be written last */ 421 d = &(buf[2]); 422 p = d + 9; /* leave space for message type, version, 423 * individual length fields */ 424 425 *(d++) = SSL2_MT_CLIENT_HELLO; 426 *(d++) = version_major; 427 *(d++) = version_minor; 428 429 /* Ciphers supported */ 430 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), p, 0); 431 if (i == 0) { 432 /* no ciphers */ 433 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 434 return -1; 435 } 436 s2n(i, d); 437 p += i; 438 439 /* 440 * put in the session-id length (zero since there is no reuse) 441 */ 442#if 0 443 s->session->session_id_length = 0; 444#endif 445 s2n(0, d); 446 447 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 448 ch_len = SSL2_CHALLENGE_LENGTH; 449 else 450 ch_len = SSL2_MAX_CHALLENGE_LENGTH; 451 452 /* write out sslv2 challenge */ 453 /* 454 * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it 455 * is one of SSL2_MAX_CHALLENGE_LENGTH (32) or 456 * SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for 457 * futurproofing 458 */ 459 if (SSL3_RANDOM_SIZE < ch_len) 460 i = SSL3_RANDOM_SIZE; 461 else 462 i = ch_len; 463 s2n(i, d); 464 memset(&(s->s3->client_random[0]), 0, SSL3_RANDOM_SIZE); 465 if (RAND_pseudo_bytes 466 (&(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i) <= 0) 467 return -1; 468 469 memcpy(p, &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i); 470 p += i; 471 472 i = p - &(buf[2]); 473 buf[0] = ((i >> 8) & 0xff) | 0x80; 474 buf[1] = (i & 0xff); 475 476 /* number of bytes to write */ 477 s->init_num = i + 2; 478 s->init_off = 0; 479 480 ssl3_finish_mac(s, &(buf[2]), i); 481 } else { 482 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 483 484 /* 485 * do the record header (5 bytes) and handshake message header (4 486 * bytes) last 487 */ 488 d = p = &(buf[9]); 489 490 *(p++) = version_major; 491 *(p++) = version_minor; 492 493 /* Random stuff */ 494 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 495 p += SSL3_RANDOM_SIZE; 496 497 /* Session ID (zero since there is no reuse) */ 498 *(p++) = 0; 499 500 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 501 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 502 ssl3_put_cipher_by_char); 503 if (i == 0) { 504 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 505 return -1; 506 } 507#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 508 /* 509 * Some servers hang if client hello > 256 bytes as hack 510 * workaround chop number of supported ciphers to keep it well 511 * below this if we use TLS v1.2 512 */ 513 if (TLS1_get_version(s) >= TLS1_2_VERSION 514 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) 515 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; 516#endif 517 s2n(i, p); 518 p += i; 519 520 /* COMPRESSION */ 521#ifdef OPENSSL_NO_COMP 522 *(p++) = 1; 523#else 524 if ((s->options & SSL_OP_NO_COMPRESSION) 525 || !s->ctx->comp_methods) 526 j = 0; 527 else 528 j = sk_SSL_COMP_num(s->ctx->comp_methods); 529 *(p++) = 1 + j; 530 for (i = 0; i < j; i++) { 531 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 532 *(p++) = comp->id; 533 } 534#endif 535 *(p++) = 0; /* Add the NULL method */ 536 537#ifndef OPENSSL_NO_TLSEXT 538 /* TLS extensions */ 539 if (ssl_prepare_clienthello_tlsext(s) <= 0) { 540 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); 541 return -1; 542 } 543 if ((p = 544 ssl_add_clienthello_tlsext(s, p, 545 buf + 546 SSL3_RT_MAX_PLAIN_LENGTH)) == 547 NULL) { 548 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 549 return -1; 550 } 551#endif 552 553 l = p - d; 554 555 /* fill in 4-byte handshake header */ 556 d = &(buf[5]); 557 *(d++) = SSL3_MT_CLIENT_HELLO; 558 l2n3(l, d); 559 560 l += 4; 561 562 if (l > SSL3_RT_MAX_PLAIN_LENGTH) { 563 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 564 return -1; 565 } 566 567 /* fill in 5-byte record header */ 568 d = buf; 569 *(d++) = SSL3_RT_HANDSHAKE; 570 *(d++) = version_major; 571 /* 572 * Some servers hang if we use long client hellos and a record 573 * number > TLS 1.0. 574 */ 575 if (TLS1_get_client_version(s) > TLS1_VERSION) 576 *(d++) = 1; 577 else 578 *(d++) = version_minor; 579 s2n((int)l, d); 580 581 /* number of bytes to write */ 582 s->init_num = p - buf; 583 s->init_off = 0; 584 585 ssl3_finish_mac(s, &(buf[5]), s->init_num - 5); 586 } 587 588 s->state = SSL23_ST_CW_CLNT_HELLO_B; 589 s->init_off = 0; 590 } 591 592 /* SSL3_ST_CW_CLNT_HELLO_B */ 593 ret = ssl23_write_bytes(s); 594 595 if ((ret >= 2) && s->msg_callback) { 596 /* Client Hello has been sent; tell msg_callback */ 597 598 if (ssl2_compat) 599 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data + 2, 600 ret - 2, s, s->msg_callback_arg); 601 else 602 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, 603 s->init_buf->data + 5, ret - 5, s, 604 s->msg_callback_arg); 605 } 606 607 return ret; 608} 609 610static int ssl23_get_server_hello(SSL *s) 611{ 612 char buf[8]; 613 unsigned char *p; 614 int i; 615 int n; 616 617 n = ssl23_read_bytes(s, 7); 618 619 if (n != 7) 620 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#ifdef OPENSSL_NO_SSL2 628 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 629 goto err; 630#else 631 /* we are talking sslv2 */ 632 /* 633 * we need to clean up the SSLv3 setup and put in the sslv2 stuff. 634 */ 635 int ch_len; 636 637 if (s->options & SSL_OP_NO_SSLv2) { 638 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 639 goto err; 640 } 641 if (s->s2 == NULL) { 642 if (!ssl2_new(s)) 643 goto err; 644 } else 645 ssl2_clear(s); 646 647 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 648 ch_len = SSL2_CHALLENGE_LENGTH; 649 else 650 ch_len = SSL2_MAX_CHALLENGE_LENGTH; 651 652 /* write out sslv2 challenge */ 653 /* 654 * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it is 655 * one of SSL2_MAX_CHALLENGE_LENGTH (32) or SSL2_MAX_CHALLENGE_LENGTH 656 * (16), but leave the check in for futurproofing 657 */ 658 i = (SSL3_RANDOM_SIZE < ch_len) 659 ? SSL3_RANDOM_SIZE : ch_len; 660 s->s2->challenge_length = i; 661 memcpy(s->s2->challenge, 662 &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i); 663 664 if (s->s3 != NULL) 665 ssl3_free(s); 666 667 if (!BUF_MEM_grow_clean(s->init_buf, 668 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { 669 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB); 670 goto err; 671 } 672 673 s->state = SSL2_ST_GET_SERVER_HELLO_A; 674 if (!(s->client_version == SSL2_VERSION)) 675 /* 676 * use special padding (SSL 3.0 draft/RFC 2246, App. E.2) 677 */ 678 s->s2->ssl2_rollback = 1; 679 680 /* 681 * setup the 7 bytes we have read so we get them from the sslv2 682 * buffer 683 */ 684 s->rstate = SSL_ST_READ_HEADER; 685 s->packet_length = n; 686 s->packet = &(s->s2->rbuf[0]); 687 memcpy(s->packet, buf, n); 688 s->s2->rbuf_left = n; 689 s->s2->rbuf_offs = 0; 690 691 /* we have already written one */ 692 s->s2->write_sequence = 1; 693 694 s->method = SSLv2_client_method(); 695 s->handshake_func = s->method->ssl_connect; 696#endif 697 } else if (p[1] == SSL3_VERSION_MAJOR && 698 p[2] <= TLS1_2_VERSION_MINOR && 699 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 700 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) { 701 /* we have sslv3 or tls1 (server hello or alert) */ 702 703#ifndef OPENSSL_NO_SSL3 704 if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) { 705# ifdef OPENSSL_FIPS 706 if (FIPS_mode()) { 707 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, 708 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 709 goto err; 710 } 711# endif 712 s->version = SSL3_VERSION; 713 s->method = SSLv3_client_method(); 714 } else 715#endif 716 if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) { 717 s->version = TLS1_VERSION; 718 s->method = TLSv1_client_method(); 719 } else if ((p[2] == TLS1_1_VERSION_MINOR) && 720 !(s->options & SSL_OP_NO_TLSv1_1)) { 721 s->version = TLS1_1_VERSION; 722 s->method = TLSv1_1_client_method(); 723 } else if ((p[2] == TLS1_2_VERSION_MINOR) && 724 !(s->options & SSL_OP_NO_TLSv1_2)) { 725 s->version = TLS1_2_VERSION; 726 s->method = TLSv1_2_client_method(); 727 } else { 728 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 729 goto err; 730 } 731 732 /* ensure that TLS_MAX_VERSION is up-to-date */ 733 OPENSSL_assert(s->version <= TLS_MAX_VERSION); 734 735 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) { 736 /* fatal alert */ 737 738 void (*cb) (const SSL *ssl, int type, int val) = NULL; 739 int j; 740 741 if (s->info_callback != NULL) 742 cb = s->info_callback; 743 else if (s->ctx->info_callback != NULL) 744 cb = s->ctx->info_callback; 745 746 i = p[5]; 747 if (cb != NULL) { 748 j = (i << 8) | p[6]; 749 cb(s, SSL_CB_READ_ALERT, j); 750 } 751 752 if (s->msg_callback) 753 s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s, 754 s->msg_callback_arg); 755 756 s->rwstate = SSL_NOTHING; 757 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]); 758 goto err; 759 } 760 761 if (!ssl_init_wbio_buffer(s, 1)) 762 goto err; 763 764 /* we are in this state */ 765 s->state = SSL3_ST_CR_SRVR_HELLO_A; 766 767 /* 768 * put the 7 bytes we have read into the input buffer for SSLv3 769 */ 770 s->rstate = SSL_ST_READ_HEADER; 771 s->packet_length = n; 772 if (s->s3->rbuf.buf == NULL) 773 if (!ssl3_setup_read_buffer(s)) 774 goto err; 775 s->packet = &(s->s3->rbuf.buf[0]); 776 memcpy(s->packet, buf, n); 777 s->s3->rbuf.left = n; 778 s->s3->rbuf.offset = 0; 779 780 s->handshake_func = s->method->ssl_connect; 781 } else { 782 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL); 783 goto err; 784 } 785 s->init_num = 0; 786 787 /* 788 * Since, if we are sending a ssl23 client hello, we are not reusing a 789 * session-id 790 */ 791 if (!ssl_get_new_session(s, 0)) 792 goto err; 793 794 return (SSL_connect(s)); 795 err: 796 return (-1); 797} 798