s23_clnt.c revision 306195
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 if (len < 4) 283 return 0; 284 if (server) 285 send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0; 286 else 287 send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0; 288 if (send_time) { 289 unsigned long Time = (unsigned long)time(NULL); 290 unsigned char *p = result; 291 l2n(Time, p); 292 return RAND_bytes(p, len - 4); 293 } else 294 return RAND_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 int al = 0; 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 if (s->cert->cli_ext.meths_count != 0) 372 ssl2_compat = 0; 373 } 374#endif 375 376 buf = (unsigned char *)s->init_buf->data; 377 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) { 378 /* 379 * Since we're sending s23 client hello, we're not reusing a session, as 380 * we'd be using the method from the saved session instead 381 */ 382 if (!ssl_get_new_session(s, 0)) { 383 return -1; 384 } 385 386 p = s->s3->client_random; 387 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0) 388 return -1; 389 390 if (version == TLS1_2_VERSION) { 391 version_major = TLS1_2_VERSION_MAJOR; 392 version_minor = TLS1_2_VERSION_MINOR; 393 } else if (tls1_suiteb(s)) { 394 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 395 SSL_R_ONLY_TLS_1_2_ALLOWED_IN_SUITEB_MODE); 396 return -1; 397 } else if (version == TLS1_1_VERSION) { 398 version_major = TLS1_1_VERSION_MAJOR; 399 version_minor = TLS1_1_VERSION_MINOR; 400 } else if (version == TLS1_VERSION) { 401 version_major = TLS1_VERSION_MAJOR; 402 version_minor = TLS1_VERSION_MINOR; 403 } 404#ifdef OPENSSL_FIPS 405 else if (FIPS_mode()) { 406 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 407 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 408 return -1; 409 } 410#endif 411 else if (version == SSL3_VERSION) { 412 version_major = SSL3_VERSION_MAJOR; 413 version_minor = SSL3_VERSION_MINOR; 414 } else if (version == SSL2_VERSION) { 415 version_major = SSL2_VERSION_MAJOR; 416 version_minor = SSL2_VERSION_MINOR; 417 } else { 418 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_PROTOCOLS_AVAILABLE); 419 return (-1); 420 } 421 422 s->client_version = version; 423 424 if (ssl2_compat) { 425 /* create SSL 2.0 compatible Client Hello */ 426 427 /* two byte record header will be written last */ 428 d = &(buf[2]); 429 p = d + 9; /* leave space for message type, version, 430 * individual length fields */ 431 432 *(d++) = SSL2_MT_CLIENT_HELLO; 433 *(d++) = version_major; 434 *(d++) = version_minor; 435 436 /* Ciphers supported */ 437 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), p, 0); 438 if (i == 0) { 439 /* no ciphers */ 440 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 441 return -1; 442 } 443 s2n(i, d); 444 p += i; 445 446 /* 447 * put in the session-id length (zero since there is no reuse) 448 */ 449 s2n(0, d); 450 451 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 452 ch_len = SSL2_CHALLENGE_LENGTH; 453 else 454 ch_len = SSL2_MAX_CHALLENGE_LENGTH; 455 456 /* write out sslv2 challenge */ 457 /* 458 * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it 459 * is one of SSL2_MAX_CHALLENGE_LENGTH (32) or 460 * SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for 461 * futurproofing 462 */ 463 if (SSL3_RANDOM_SIZE < ch_len) 464 i = SSL3_RANDOM_SIZE; 465 else 466 i = ch_len; 467 s2n(i, d); 468 memset(&(s->s3->client_random[0]), 0, SSL3_RANDOM_SIZE); 469 if (RAND_bytes (&(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i) 470 <= 0) 471 return -1; 472 473 memcpy(p, &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i); 474 p += i; 475 476 i = p - &(buf[2]); 477 buf[0] = ((i >> 8) & 0xff) | 0x80; 478 buf[1] = (i & 0xff); 479 480 /* number of bytes to write */ 481 s->init_num = i + 2; 482 s->init_off = 0; 483 484 ssl3_finish_mac(s, &(buf[2]), i); 485 } else { 486 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 487 488 /* 489 * do the record header (5 bytes) and handshake message header (4 490 * bytes) last 491 */ 492 d = p = &(buf[9]); 493 494 *(p++) = version_major; 495 *(p++) = version_minor; 496 497 /* Random stuff */ 498 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 499 p += SSL3_RANDOM_SIZE; 500 501 /* Session ID (zero since there is no reuse) */ 502 *(p++) = 0; 503 504 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 505 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 506 ssl3_put_cipher_by_char); 507 if (i == 0) { 508 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 509 return -1; 510 } 511#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 512 /* 513 * Some servers hang if client hello > 256 bytes as hack 514 * workaround chop number of supported ciphers to keep it well 515 * 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 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 536 *(p++) = comp->id; 537 } 538#endif 539 *(p++) = 0; /* Add the NULL method */ 540 541#ifndef OPENSSL_NO_TLSEXT 542 /* TLS extensions */ 543 if (ssl_prepare_clienthello_tlsext(s) <= 0) { 544 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); 545 return -1; 546 } 547 if ((p = 548 ssl_add_clienthello_tlsext(s, p, 549 buf + SSL3_RT_MAX_PLAIN_LENGTH, 550 &al)) == NULL) { 551 ssl3_send_alert(s, SSL3_AL_FATAL, al); 552 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 553 return -1; 554 } 555#endif 556 557 l = p - d; 558 559 /* fill in 4-byte handshake header */ 560 d = &(buf[5]); 561 *(d++) = SSL3_MT_CLIENT_HELLO; 562 l2n3(l, d); 563 564 l += 4; 565 566 if (l > SSL3_RT_MAX_PLAIN_LENGTH) { 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 /* 576 * Some servers hang if we use long client hellos and a record 577 * number > TLS 1.0. 578 */ 579 if (TLS1_get_client_version(s) > TLS1_VERSION) 580 *(d++) = 1; 581 else 582 *(d++) = version_minor; 583 s2n((int)l, d); 584 585 /* number of bytes to write */ 586 s->init_num = p - buf; 587 s->init_off = 0; 588 589 ssl3_finish_mac(s, &(buf[5]), s->init_num - 5); 590 } 591 592 s->state = SSL23_ST_CW_CLNT_HELLO_B; 593 s->init_off = 0; 594 } 595 596 /* SSL3_ST_CW_CLNT_HELLO_B */ 597 ret = ssl23_write_bytes(s); 598 599 if ((ret >= 2) && s->msg_callback) { 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, 604 ret - 2, s, s->msg_callback_arg); 605 else { 606 s->msg_callback(1, version, SSL3_RT_HEADER, s->init_buf->data, 5, 607 s, s->msg_callback_arg); 608 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, 609 s->init_buf->data + 5, ret - 5, s, 610 s->msg_callback_arg); 611 } 612 } 613 614 return ret; 615} 616 617static int ssl23_get_server_hello(SSL *s) 618{ 619 char buf[8]; 620 unsigned char *p; 621 int i; 622 int n; 623 624 n = ssl23_read_bytes(s, 7); 625 626 if (n != 7) 627 return (n); 628 p = s->packet; 629 630 memcpy(buf, p, n); 631 632 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 633 (p[5] == 0x00) && (p[6] == 0x02)) { 634#ifdef OPENSSL_NO_SSL2 635 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 636 goto err; 637#else 638 /* we are talking sslv2 */ 639 /* 640 * we need to clean up the SSLv3 setup and put in the sslv2 stuff. 641 */ 642 int ch_len; 643 644 if (s->options & SSL_OP_NO_SSLv2) { 645 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 646 goto err; 647 } 648 if (s->s2 == NULL) { 649 if (!ssl2_new(s)) 650 goto err; 651 } else 652 ssl2_clear(s); 653 654 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 655 ch_len = SSL2_CHALLENGE_LENGTH; 656 else 657 ch_len = SSL2_MAX_CHALLENGE_LENGTH; 658 659 /* write out sslv2 challenge */ 660 /* 661 * Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it is 662 * one of SSL2_MAX_CHALLENGE_LENGTH (32) or SSL2_MAX_CHALLENGE_LENGTH 663 * (16), but leave the check in for futurproofing 664 */ 665 i = (SSL3_RANDOM_SIZE < ch_len) 666 ? SSL3_RANDOM_SIZE : ch_len; 667 s->s2->challenge_length = i; 668 memcpy(s->s2->challenge, 669 &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i); 670 671 if (s->s3 != NULL) 672 ssl3_free(s); 673 674 if (!BUF_MEM_grow_clean(s->init_buf, 675 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { 676 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB); 677 goto err; 678 } 679 680 s->state = SSL2_ST_GET_SERVER_HELLO_A; 681 if (!(s->client_version == SSL2_VERSION)) 682 /* 683 * use special padding (SSL 3.0 draft/RFC 2246, App. E.2) 684 */ 685 s->s2->ssl2_rollback = 1; 686 687 /* 688 * setup the 7 bytes we have read so we get them from the sslv2 689 * buffer 690 */ 691 s->rstate = SSL_ST_READ_HEADER; 692 s->packet_length = n; 693 s->packet = &(s->s2->rbuf[0]); 694 memcpy(s->packet, buf, n); 695 s->s2->rbuf_left = n; 696 s->s2->rbuf_offs = 0; 697 698 /* we have already written one */ 699 s->s2->write_sequence = 1; 700 701 s->method = SSLv2_client_method(); 702 s->handshake_func = s->method->ssl_connect; 703#endif 704 } else if (p[1] == SSL3_VERSION_MAJOR && 705 p[2] <= TLS1_2_VERSION_MINOR && 706 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 707 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) { 708 /* we have sslv3 or tls1 (server hello or alert) */ 709 710#ifndef OPENSSL_NO_SSL3 711 if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) { 712# ifdef OPENSSL_FIPS 713 if (FIPS_mode()) { 714 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, 715 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 716 goto err; 717 } 718# endif 719 s->version = SSL3_VERSION; 720 s->method = SSLv3_client_method(); 721 } else 722#endif 723 if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) { 724 s->version = TLS1_VERSION; 725 s->method = TLSv1_client_method(); 726 } else if ((p[2] == TLS1_1_VERSION_MINOR) && 727 !(s->options & SSL_OP_NO_TLSv1_1)) { 728 s->version = TLS1_1_VERSION; 729 s->method = TLSv1_1_client_method(); 730 } else if ((p[2] == TLS1_2_VERSION_MINOR) && 731 !(s->options & SSL_OP_NO_TLSv1_2)) { 732 s->version = TLS1_2_VERSION; 733 s->method = TLSv1_2_client_method(); 734 } else { 735 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 736 goto err; 737 } 738 739 s->session->ssl_version = s->version; 740 741 /* ensure that TLS_MAX_VERSION is up-to-date */ 742 OPENSSL_assert(s->version <= TLS_MAX_VERSION); 743 744 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) { 745 /* fatal alert */ 746 747 void (*cb) (const SSL *ssl, int type, int val) = NULL; 748 int j; 749 750 if (s->info_callback != NULL) 751 cb = s->info_callback; 752 else if (s->ctx->info_callback != NULL) 753 cb = s->ctx->info_callback; 754 755 i = p[5]; 756 if (cb != NULL) { 757 j = (i << 8) | p[6]; 758 cb(s, SSL_CB_READ_ALERT, j); 759 } 760 761 if (s->msg_callback) { 762 s->msg_callback(0, s->version, SSL3_RT_HEADER, p, 5, s, 763 s->msg_callback_arg); 764 s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s, 765 s->msg_callback_arg); 766 } 767 768 s->rwstate = SSL_NOTHING; 769 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]); 770 goto err; 771 } 772 773 if (!ssl_init_wbio_buffer(s, 1)) 774 goto err; 775 776 /* we are in this state */ 777 s->state = SSL3_ST_CR_SRVR_HELLO_A; 778 779 /* 780 * put the 7 bytes we have read into the input buffer for SSLv3 781 */ 782 s->rstate = SSL_ST_READ_HEADER; 783 s->packet_length = n; 784 if (s->s3->rbuf.buf == NULL) 785 if (!ssl3_setup_read_buffer(s)) 786 goto err; 787 s->packet = &(s->s3->rbuf.buf[0]); 788 memcpy(s->packet, buf, n); 789 s->s3->rbuf.left = n; 790 s->s3->rbuf.offset = 0; 791 792 s->handshake_func = s->method->ssl_connect; 793 } else { 794 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL); 795 goto err; 796 } 797 s->init_num = 0; 798 799 return (SSL_connect(s)); 800 err: 801 return (-1); 802} 803