s23_clnt.c revision 325335
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 if (!ssl3_init_finished_mac(s)) { 208 ret = -1; 209 goto end; 210 } 211 212 s->state = SSL23_ST_CW_CLNT_HELLO_A; 213 s->ctx->stats.sess_connect++; 214 s->init_num = 0; 215 break; 216 217 case SSL23_ST_CW_CLNT_HELLO_A: 218 case SSL23_ST_CW_CLNT_HELLO_B: 219 220 s->shutdown = 0; 221 ret = ssl23_client_hello(s); 222 if (ret <= 0) 223 goto end; 224 s->state = SSL23_ST_CR_SRVR_HELLO_A; 225 s->init_num = 0; 226 227 break; 228 229 case SSL23_ST_CR_SRVR_HELLO_A: 230 case SSL23_ST_CR_SRVR_HELLO_B: 231 ret = ssl23_get_server_hello(s); 232 if (ret >= 0) 233 cb = NULL; 234 goto end; 235 /* break; */ 236 237 default: 238 SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE); 239 ret = -1; 240 goto end; 241 /* break; */ 242 } 243 244 if (s->debug) { 245 (void)BIO_flush(s->wbio); 246 } 247 248 if ((cb != NULL) && (s->state != state)) { 249 new_state = s->state; 250 s->state = state; 251 cb(s, SSL_CB_CONNECT_LOOP, 1); 252 s->state = new_state; 253 } 254 } 255 end: 256 s->in_handshake--; 257 if (buf != NULL) 258 BUF_MEM_free(buf); 259 if (cb != NULL) 260 cb(s, SSL_CB_CONNECT_EXIT, ret); 261 return (ret); 262} 263 264static int ssl23_no_ssl2_ciphers(SSL *s) 265{ 266 SSL_CIPHER *cipher; 267 STACK_OF(SSL_CIPHER) *ciphers; 268 int i; 269 ciphers = SSL_get_ciphers(s); 270 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 271 cipher = sk_SSL_CIPHER_value(ciphers, i); 272 if (cipher->algorithm_ssl == SSL_SSLV2) 273 return 0; 274 } 275 return 1; 276} 277 278/* 279 * Fill a ClientRandom or ServerRandom field of length len. Returns <= 0 on 280 * failure, 1 on success. 281 */ 282int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len) 283{ 284 int send_time = 0; 285 if (len < 4) 286 return 0; 287 if (server) 288 send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0; 289 else 290 send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0; 291 if (send_time) { 292 unsigned long Time = (unsigned long)time(NULL); 293 unsigned char *p = result; 294 l2n(Time, p); 295 return RAND_bytes(p, len - 4); 296 } else 297 return RAND_bytes(result, len); 298} 299 300static int ssl23_client_hello(SSL *s) 301{ 302 unsigned char *buf; 303 unsigned char *p, *d; 304 int i, ch_len; 305 unsigned long l; 306 int ssl2_compat; 307 int version = 0, version_major, version_minor; 308 int al = 0; 309#ifndef OPENSSL_NO_COMP 310 int j; 311 SSL_COMP *comp; 312#endif 313 int ret; 314 unsigned long mask, options = s->options; 315 316 ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1; 317 318 if (ssl2_compat && ssl23_no_ssl2_ciphers(s)) 319 ssl2_compat = 0; 320 321 /* 322 * SSL_OP_NO_X disables all protocols above X *if* there are 323 * some protocols below X enabled. This is required in order 324 * to maintain "version capability" vector contiguous. So 325 * that if application wants to disable TLS1.0 in favour of 326 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the 327 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. 328 */ 329 mask = SSL_OP_NO_TLSv1_1 | SSL_OP_NO_TLSv1 330#if !defined(OPENSSL_NO_SSL3) 331 | SSL_OP_NO_SSLv3 332#endif 333#if !defined(OPENSSL_NO_SSL2) 334 | (ssl2_compat ? SSL_OP_NO_SSLv2 : 0) 335#endif 336 ; 337#if !defined(OPENSSL_NO_TLS1_2_CLIENT) 338 version = TLS1_2_VERSION; 339 340 if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask) 341 version = TLS1_1_VERSION; 342#else 343 version = TLS1_1_VERSION; 344#endif 345 mask &= ~SSL_OP_NO_TLSv1_1; 346 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask) 347 version = TLS1_VERSION; 348 mask &= ~SSL_OP_NO_TLSv1; 349#if !defined(OPENSSL_NO_SSL3) 350 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask) 351 version = SSL3_VERSION; 352 mask &= ~SSL_OP_NO_SSLv3; 353#endif 354#if !defined(OPENSSL_NO_SSL2) 355 if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask) 356 version = SSL2_VERSION; 357#endif 358 359#ifndef OPENSSL_NO_TLSEXT 360 if (version != SSL2_VERSION) { 361 /* 362 * have to disable SSL 2.0 compatibility if we need TLS extensions 363 */ 364 365 if (s->tlsext_hostname != NULL) 366 ssl2_compat = 0; 367 if (s->tlsext_status_type != -1) 368 ssl2_compat = 0; 369# ifdef TLSEXT_TYPE_opaque_prf_input 370 if (s->ctx->tlsext_opaque_prf_input_callback != 0 371 || s->tlsext_opaque_prf_input != NULL) 372 ssl2_compat = 0; 373# endif 374 if (s->cert->cli_ext.meths_count != 0) 375 ssl2_compat = 0; 376 } 377#endif 378 379 buf = (unsigned char *)s->init_buf->data; 380 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) { 381 /* 382 * Since we're sending s23 client hello, we're not reusing a session, as 383 * we'd be using the method from the saved session instead 384 */ 385 if (!ssl_get_new_session(s, 0)) { 386 return -1; 387 } 388 389 p = s->s3->client_random; 390 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0) 391 return -1; 392 393 if (version == TLS1_2_VERSION) { 394 version_major = TLS1_2_VERSION_MAJOR; 395 version_minor = TLS1_2_VERSION_MINOR; 396 } else if (tls1_suiteb(s)) { 397 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 398 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE); 399 return -1; 400 } else if (version == TLS1_1_VERSION) { 401 version_major = TLS1_1_VERSION_MAJOR; 402 version_minor = TLS1_1_VERSION_MINOR; 403 } else if (version == TLS1_VERSION) { 404 version_major = TLS1_VERSION_MAJOR; 405 version_minor = TLS1_VERSION_MINOR; 406 } 407#ifdef OPENSSL_FIPS 408 else if (FIPS_mode()) { 409 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 410 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 411 return -1; 412 } 413#endif 414 else if (version == SSL3_VERSION) { 415 version_major = SSL3_VERSION_MAJOR; 416 version_minor = SSL3_VERSION_MINOR; 417 } else if (version == SSL2_VERSION) { 418 version_major = SSL2_VERSION_MAJOR; 419 version_minor = SSL2_VERSION_MINOR; 420 } else { 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 /* create SSL 2.0 compatible Client Hello */ 429 430 /* two byte record header will be written last */ 431 d = &(buf[2]); 432 p = d + 9; /* leave space for message type, version, 433 * 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 /* no ciphers */ 443 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 444 return -1; 445 } 446 s2n(i, d); 447 p += i; 448 449 /* 450 * put in the session-id length (zero since there is no reuse) 451 */ 452 s2n(0, d); 453 454 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 455 ch_len = SSL2_CHALLENGE_LENGTH; 456 else 457 ch_len = SSL2_MAX_CHALLENGE_LENGTH; 458 459 /* write out sslv2 challenge */ 460 /* 461 * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it 462 * is one of SSL2_MAX_CHALLENGE_LENGTH (32) or 463 * SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for 464 * futurproofing 465 */ 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_bytes (&(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i) 473 <= 0) 474 return -1; 475 476 memcpy(p, &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i); 477 p += i; 478 479 i = p - &(buf[2]); 480 buf[0] = ((i >> 8) & 0xff) | 0x80; 481 buf[1] = (i & 0xff); 482 483 /* number of bytes to write */ 484 s->init_num = i + 2; 485 s->init_off = 0; 486 487 ssl3_finish_mac(s, &(buf[2]), i); 488 } else { 489 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 490 491 /* 492 * do the record header (5 bytes) and handshake message header (4 493 * bytes) last 494 */ 495 d = p = &(buf[9]); 496 497 *(p++) = version_major; 498 *(p++) = version_minor; 499 500 /* Random stuff */ 501 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 502 p += SSL3_RANDOM_SIZE; 503 504 /* Session ID (zero since there is no reuse) */ 505 *(p++) = 0; 506 507 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 508 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 509 ssl3_put_cipher_by_char); 510 if (i == 0) { 511 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 512 return -1; 513 } 514#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 515 /* 516 * Some servers hang if client hello > 256 bytes as hack 517 * workaround chop number of supported ciphers to keep it well 518 * below this if we use TLS v1.2 519 */ 520 if (TLS1_get_version(s) >= TLS1_2_VERSION 521 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) 522 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; 523#endif 524 s2n(i, p); 525 p += i; 526 527 /* COMPRESSION */ 528#ifdef OPENSSL_NO_COMP 529 *(p++) = 1; 530#else 531 if ((s->options & SSL_OP_NO_COMPRESSION) 532 || !s->ctx->comp_methods) 533 j = 0; 534 else 535 j = sk_SSL_COMP_num(s->ctx->comp_methods); 536 *(p++) = 1 + j; 537 for (i = 0; i < j; i++) { 538 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 539 *(p++) = comp->id; 540 } 541#endif 542 *(p++) = 0; /* Add the NULL method */ 543 544#ifndef OPENSSL_NO_TLSEXT 545 /* TLS extensions */ 546 if (ssl_prepare_clienthello_tlsext(s) <= 0) { 547 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); 548 return -1; 549 } 550 if ((p = 551 ssl_add_clienthello_tlsext(s, p, 552 buf + SSL3_RT_MAX_PLAIN_LENGTH, 553 &al)) == NULL) { 554 ssl3_send_alert(s, SSL3_AL_FATAL, al); 555 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 556 return -1; 557 } 558#endif 559 560 l = p - d; 561 562 /* fill in 4-byte handshake header */ 563 d = &(buf[5]); 564 *(d++) = SSL3_MT_CLIENT_HELLO; 565 l2n3(l, d); 566 567 l += 4; 568 569 if (l > SSL3_RT_MAX_PLAIN_LENGTH) { 570 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 571 return -1; 572 } 573 574 /* fill in 5-byte record header */ 575 d = buf; 576 *(d++) = SSL3_RT_HANDSHAKE; 577 *(d++) = version_major; 578 /* 579 * Some servers hang if we use long client hellos and a record 580 * number > TLS 1.0. 581 */ 582 if (TLS1_get_client_version(s) > TLS1_VERSION) 583 *(d++) = 1; 584 else 585 *(d++) = version_minor; 586 s2n((int)l, d); 587 588 /* number of bytes to write */ 589 s->init_num = p - buf; 590 s->init_off = 0; 591 592 ssl3_finish_mac(s, &(buf[5]), s->init_num - 5); 593 } 594 595 s->state = SSL23_ST_CW_CLNT_HELLO_B; 596 s->init_off = 0; 597 } 598 599 /* SSL3_ST_CW_CLNT_HELLO_B */ 600 ret = ssl23_write_bytes(s); 601 602 if ((ret >= 2) && s->msg_callback) { 603 /* Client Hello has been sent; tell msg_callback */ 604 605 if (ssl2_compat) 606 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data + 2, 607 ret - 2, s, s->msg_callback_arg); 608 else { 609 s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5, 610 s, s->msg_callback_arg); 611 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, 612 s->init_buf->data + 5, ret - 5, s, 613 s->msg_callback_arg); 614 } 615 } 616 617 return ret; 618} 619 620static int ssl23_get_server_hello(SSL *s) 621{ 622 char buf[8]; 623 unsigned char *p; 624 int i; 625 int n; 626 627 n = ssl23_read_bytes(s, 7); 628 629 if (n != 7) 630 return (n); 631 p = s->packet; 632 633 memcpy(buf, p, n); 634 635 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 636 (p[5] == 0x00) && (p[6] == 0x02)) { 637#ifdef OPENSSL_NO_SSL2 638 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 639 goto err; 640#else 641 /* we are talking sslv2 */ 642 /* 643 * we need to clean up the SSLv3 setup and put in the sslv2 stuff. 644 */ 645 int ch_len; 646 647 if (s->options & SSL_OP_NO_SSLv2) { 648 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 649 goto err; 650 } 651 if (s->s2 == NULL) { 652 if (!ssl2_new(s)) 653 goto err; 654 } else 655 ssl2_clear(s); 656 657 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 658 ch_len = SSL2_CHALLENGE_LENGTH; 659 else 660 ch_len = SSL2_MAX_CHALLENGE_LENGTH; 661 662 /* write out sslv2 challenge */ 663 /* 664 * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it is 665 * one of SSL2_MAX_CHALLENGE_LENGTH (32) or SSL2_MAX_CHALLENGE_LENGTH 666 * (16), but leave the check in for futurproofing 667 */ 668 i = (SSL3_RANDOM_SIZE < ch_len) 669 ? SSL3_RANDOM_SIZE : ch_len; 670 s->s2->challenge_length = i; 671 memcpy(s->s2->challenge, 672 &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i); 673 674 if (s->s3 != NULL) 675 ssl3_free(s); 676 677 if (!BUF_MEM_grow_clean(s->init_buf, 678 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { 679 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB); 680 goto err; 681 } 682 683 s->state = SSL2_ST_GET_SERVER_HELLO_A; 684 if (!(s->client_version == SSL2_VERSION)) 685 /* 686 * use special padding (SSL 3.0 draft/RFC 2246, App. E.2) 687 */ 688 s->s2->ssl2_rollback = 1; 689 690 /* 691 * setup the 7 bytes we have read so we get them from the sslv2 692 * buffer 693 */ 694 s->rstate = SSL_ST_READ_HEADER; 695 s->packet_length = n; 696 s->packet = &(s->s2->rbuf[0]); 697 memcpy(s->packet, buf, n); 698 s->s2->rbuf_left = n; 699 s->s2->rbuf_offs = 0; 700 701 /* we have already written one */ 702 s->s2->write_sequence = 1; 703 704 s->method = SSLv2_client_method(); 705 s->handshake_func = s->method->ssl_connect; 706#endif 707 } else if (p[1] == SSL3_VERSION_MAJOR && 708 p[2] <= TLS1_2_VERSION_MINOR && 709 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 710 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) { 711 /* we have sslv3 or tls1 (server hello or alert) */ 712 713#ifndef OPENSSL_NO_SSL3 714 if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) { 715# ifdef OPENSSL_FIPS 716 if (FIPS_mode()) { 717 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, 718 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 719 goto err; 720 } 721# endif 722 s->version = SSL3_VERSION; 723 s->method = SSLv3_client_method(); 724 } else 725#endif 726 if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) { 727 s->version = TLS1_VERSION; 728 s->method = TLSv1_client_method(); 729 } else if ((p[2] == TLS1_1_VERSION_MINOR) && 730 !(s->options & SSL_OP_NO_TLSv1_1)) { 731 s->version = TLS1_1_VERSION; 732 s->method = TLSv1_1_client_method(); 733 } else if ((p[2] == TLS1_2_VERSION_MINOR) && 734 !(s->options & SSL_OP_NO_TLSv1_2)) { 735 s->version = TLS1_2_VERSION; 736 s->method = TLSv1_2_client_method(); 737 } else { 738 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 739 goto err; 740 } 741 742 s->session->ssl_version = s->version; 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 /* fatal alert */ 749 750 void (*cb) (const SSL *ssl, int type, int val) = NULL; 751 int j; 752 753 if (s->info_callback != NULL) 754 cb = s->info_callback; 755 else if (s->ctx->info_callback != NULL) 756 cb = s->ctx->info_callback; 757 758 i = p[5]; 759 if (cb != NULL) { 760 j = (i << 8) | p[6]; 761 cb(s, SSL_CB_READ_ALERT, j); 762 } 763 764 if (s->msg_callback) { 765 s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s, 766 s->msg_callback_arg); 767 s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s, 768 s->msg_callback_arg); 769 } 770 771 s->rwstate = SSL_NOTHING; 772 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]); 773 goto err; 774 } 775 776 if (!ssl_init_wbio_buffer(s, 1)) 777 goto err; 778 779 /* we are in this state */ 780 s->state = SSL3_ST_CR_SRVR_HELLO_A; 781 782 /* 783 * put the 7 bytes we have read into the input buffer for SSLv3 784 */ 785 s->rstate = SSL_ST_READ_HEADER; 786 s->packet_length = n; 787 if (s->s3->rbuf.buf == NULL) 788 if (!ssl3_setup_read_buffer(s)) 789 goto err; 790 s->packet = &(s->s3->rbuf.buf[0]); 791 memcpy(s->packet, buf, n); 792 s->s3->rbuf.left = n; 793 s->s3->rbuf.offset = 0; 794 795 s->handshake_func = s->method->ssl_connect; 796 } else { 797 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL); 798 goto err; 799 } 800 s->init_num = 0; 801 802 return (SSL_connect(s)); 803 err: 804 return (-1); 805} 806