s23_clnt.c revision 238405
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 if (ver == SSL3_VERSION) 129 return(SSLv3_client_method()); 130 else if (ver == TLS1_VERSION) 131 return(TLSv1_client_method()); 132 else if (ver == TLS1_1_VERSION) 133 return(TLSv1_1_client_method()); 134 else if (ver == TLS1_2_VERSION) 135 return(TLSv1_2_client_method()); 136 else 137 return(NULL); 138 } 139 140IMPLEMENT_ssl23_meth_func(SSLv23_client_method, 141 ssl_undefined_function, 142 ssl23_connect, 143 ssl23_get_client_method) 144 145int ssl23_connect(SSL *s) 146 { 147 BUF_MEM *buf=NULL; 148 unsigned long Time=(unsigned long)time(NULL); 149 void (*cb)(const SSL *ssl,int type,int val)=NULL; 150 int ret= -1; 151 int new_state,state; 152 153 RAND_add(&Time,sizeof(Time),0); 154 ERR_clear_error(); 155 clear_sys_error(); 156 157 if (s->info_callback != NULL) 158 cb=s->info_callback; 159 else if (s->ctx->info_callback != NULL) 160 cb=s->ctx->info_callback; 161 162 s->in_handshake++; 163 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 164 165 for (;;) 166 { 167 state=s->state; 168 169 switch(s->state) 170 { 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 { 178 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE); 179 ret= -1; 180 goto end; 181 } 182 s->server=0; 183 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 184 185 /* s->version=TLS1_VERSION; */ 186 s->type=SSL_ST_CONNECT; 187 188 if (s->init_buf == NULL) 189 { 190 if ((buf=BUF_MEM_new()) == NULL) 191 { 192 ret= -1; 193 goto end; 194 } 195 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 196 { 197 ret= -1; 198 goto end; 199 } 200 s->init_buf=buf; 201 buf=NULL; 202 } 203 204 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } 205 206 ssl3_init_finished_mac(s); 207 208 s->state=SSL23_ST_CW_CLNT_HELLO_A; 209 s->ctx->stats.sess_connect++; 210 s->init_num=0; 211 break; 212 213 case SSL23_ST_CW_CLNT_HELLO_A: 214 case SSL23_ST_CW_CLNT_HELLO_B: 215 216 s->shutdown=0; 217 ret=ssl23_client_hello(s); 218 if (ret <= 0) goto end; 219 s->state=SSL23_ST_CR_SRVR_HELLO_A; 220 s->init_num=0; 221 222 break; 223 224 case SSL23_ST_CR_SRVR_HELLO_A: 225 case SSL23_ST_CR_SRVR_HELLO_B: 226 ret=ssl23_get_server_hello(s); 227 if (ret >= 0) cb=NULL; 228 goto end; 229 /* break; */ 230 231 default: 232 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE); 233 ret= -1; 234 goto end; 235 /* break; */ 236 } 237 238 if (s->debug) { (void)BIO_flush(s->wbio); } 239 240 if ((cb != NULL) && (s->state != state)) 241 { 242 new_state=s->state; 243 s->state=state; 244 cb(s,SSL_CB_CONNECT_LOOP,1); 245 s->state=new_state; 246 } 247 } 248end: 249 s->in_handshake--; 250 if (buf != NULL) 251 BUF_MEM_free(buf); 252 if (cb != NULL) 253 cb(s,SSL_CB_CONNECT_EXIT,ret); 254 return(ret); 255 } 256 257static int ssl23_no_ssl2_ciphers(SSL *s) 258 { 259 SSL_CIPHER *cipher; 260 STACK_OF(SSL_CIPHER) *ciphers; 261 int i; 262 ciphers = SSL_get_ciphers(s); 263 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) 264 { 265 cipher = sk_SSL_CIPHER_value(ciphers, i); 266 if (cipher->algorithm_ssl == SSL_SSLV2) 267 return 0; 268 } 269 return 1; 270 } 271 272static int ssl23_client_hello(SSL *s) 273 { 274 unsigned char *buf; 275 unsigned char *p,*d; 276 int i,ch_len; 277 unsigned long Time,l; 278 int ssl2_compat; 279 int version = 0, version_major, version_minor; 280#ifndef OPENSSL_NO_COMP 281 int j; 282 SSL_COMP *comp; 283#endif 284 int ret; 285 unsigned long mask, options = s->options; 286 287 ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1; 288 289 if (ssl2_compat && ssl23_no_ssl2_ciphers(s)) 290 ssl2_compat = 0; 291 292 /* 293 * SSL_OP_NO_X disables all protocols above X *if* there are 294 * some protocols below X enabled. This is required in order 295 * to maintain "version capability" vector contiguous. So 296 * that if application wants to disable TLS1.0 in favour of 297 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the 298 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. 299 */ 300 mask = SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1 301#if !defined(OPENSSL_NO_SSL3) 302 |SSL_OP_NO_SSLv3 303#endif 304#if !defined(OPENSSL_NO_SSL2) 305 |(ssl2_compat?SSL_OP_NO_SSLv2:0) 306#endif 307 ; 308#if !defined(OPENSSL_NO_TLS1_2_CLIENT) 309 version = TLS1_2_VERSION; 310 311 if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask) 312 version = TLS1_1_VERSION; 313#else 314 version = TLS1_1_VERSION; 315#endif 316 mask &= ~SSL_OP_NO_TLSv1_1; 317 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask) 318 version = TLS1_VERSION; 319 mask &= ~SSL_OP_NO_TLSv1; 320#if !defined(OPENSSL_NO_SSL3) 321 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask) 322 version = SSL3_VERSION; 323 mask &= ~SSL_OP_NO_SSLv3; 324#endif 325#if !defined(OPENSSL_NO_SSL2) 326 if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask) 327 version = SSL2_VERSION; 328#endif 329 330#ifndef OPENSSL_NO_TLSEXT 331 if (version != SSL2_VERSION) 332 { 333 /* have to disable SSL 2.0 compatibility if we need TLS extensions */ 334 335 if (s->tlsext_hostname != NULL) 336 ssl2_compat = 0; 337 if (s->tlsext_status_type != -1) 338 ssl2_compat = 0; 339#ifdef TLSEXT_TYPE_opaque_prf_input 340 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL) 341 ssl2_compat = 0; 342#endif 343 } 344#endif 345 346 buf=(unsigned char *)s->init_buf->data; 347 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 348 { 349#if 0 350 /* don't reuse session-id's */ 351 if (!ssl_get_new_session(s,0)) 352 { 353 return(-1); 354 } 355#endif 356 357 p=s->s3->client_random; 358 Time=(unsigned long)time(NULL); /* Time */ 359 l2n(Time,p); 360 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0) 361 return -1; 362 363 if (version == TLS1_2_VERSION) 364 { 365 version_major = TLS1_2_VERSION_MAJOR; 366 version_minor = TLS1_2_VERSION_MINOR; 367 } 368 else if (version == TLS1_1_VERSION) 369 { 370 version_major = TLS1_1_VERSION_MAJOR; 371 version_minor = TLS1_1_VERSION_MINOR; 372 } 373 else if (version == TLS1_VERSION) 374 { 375 version_major = TLS1_VERSION_MAJOR; 376 version_minor = TLS1_VERSION_MINOR; 377 } 378#ifdef OPENSSL_FIPS 379 else if(FIPS_mode()) 380 { 381 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 382 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 383 return -1; 384 } 385#endif 386 else if (version == SSL3_VERSION) 387 { 388 version_major = SSL3_VERSION_MAJOR; 389 version_minor = SSL3_VERSION_MINOR; 390 } 391 else if (version == SSL2_VERSION) 392 { 393 version_major = SSL2_VERSION_MAJOR; 394 version_minor = SSL2_VERSION_MINOR; 395 } 396 else 397 { 398 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 399 return(-1); 400 } 401 402 s->client_version = version; 403 404 if (ssl2_compat) 405 { 406 /* create SSL 2.0 compatible Client Hello */ 407 408 /* two byte record header will be written last */ 409 d = &(buf[2]); 410 p = d + 9; /* leave space for message type, version, individual length fields */ 411 412 *(d++) = SSL2_MT_CLIENT_HELLO; 413 *(d++) = version_major; 414 *(d++) = version_minor; 415 416 /* Ciphers supported */ 417 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); 418 if (i == 0) 419 { 420 /* no ciphers */ 421 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 422 return -1; 423 } 424 s2n(i,d); 425 p+=i; 426 427 /* put in the session-id length (zero since there is no reuse) */ 428#if 0 429 s->session->session_id_length=0; 430#endif 431 s2n(0,d); 432 433 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 434 ch_len=SSL2_CHALLENGE_LENGTH; 435 else 436 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 437 438 /* write out sslv2 challenge */ 439 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), 440 because it is one of SSL2_MAX_CHALLENGE_LENGTH (32) 441 or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the 442 check in for futurproofing */ 443 if (SSL3_RANDOM_SIZE < ch_len) 444 i=SSL3_RANDOM_SIZE; 445 else 446 i=ch_len; 447 s2n(i,d); 448 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); 449 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0) 450 return -1; 451 452 memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 453 p+=i; 454 455 i= p- &(buf[2]); 456 buf[0]=((i>>8)&0xff)|0x80; 457 buf[1]=(i&0xff); 458 459 /* number of bytes to write */ 460 s->init_num=i+2; 461 s->init_off=0; 462 463 ssl3_finish_mac(s,&(buf[2]),i); 464 } 465 else 466 { 467 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 468 469 /* do the record header (5 bytes) and handshake message header (4 bytes) last */ 470 d = p = &(buf[9]); 471 472 *(p++) = version_major; 473 *(p++) = version_minor; 474 475 /* Random stuff */ 476 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 477 p += SSL3_RANDOM_SIZE; 478 479 /* Session ID (zero since there is no reuse) */ 480 *(p++) = 0; 481 482 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 483 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); 484 if (i == 0) 485 { 486 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 487 return -1; 488 } 489#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 490 /* Some servers hang if client hello > 256 bytes 491 * as hack workaround chop number of supported ciphers 492 * to keep it well below this if we use TLS v1.2 493 */ 494 if (TLS1_get_version(s) >= TLS1_2_VERSION 495 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) 496 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; 497#endif 498 s2n(i,p); 499 p+=i; 500 501 /* COMPRESSION */ 502#ifdef OPENSSL_NO_COMP 503 *(p++)=1; 504#else 505 if ((s->options & SSL_OP_NO_COMPRESSION) 506 || !s->ctx->comp_methods) 507 j=0; 508 else 509 j=sk_SSL_COMP_num(s->ctx->comp_methods); 510 *(p++)=1+j; 511 for (i=0; i<j; i++) 512 { 513 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 514 *(p++)=comp->id; 515 } 516#endif 517 *(p++)=0; /* Add the NULL method */ 518 519#ifndef OPENSSL_NO_TLSEXT 520 /* TLS extensions*/ 521 if (ssl_prepare_clienthello_tlsext(s) <= 0) 522 { 523 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); 524 return -1; 525 } 526 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 527 { 528 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 529 return -1; 530 } 531#endif 532 533 l = p-d; 534 535 /* fill in 4-byte handshake header */ 536 d=&(buf[5]); 537 *(d++)=SSL3_MT_CLIENT_HELLO; 538 l2n3(l,d); 539 540 l += 4; 541 542 if (l > SSL3_RT_MAX_PLAIN_LENGTH) 543 { 544 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 545 return -1; 546 } 547 548 /* fill in 5-byte record header */ 549 d=buf; 550 *(d++) = SSL3_RT_HANDSHAKE; 551 *(d++) = version_major; 552 /* Some servers hang if we use long client hellos 553 * and a record number > TLS 1.0. 554 */ 555 if (TLS1_get_client_version(s) > TLS1_VERSION) 556 *(d++) = 1; 557 else 558 *(d++) = version_minor; 559 s2n((int)l,d); 560 561 /* number of bytes to write */ 562 s->init_num=p-buf; 563 s->init_off=0; 564 565 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); 566 } 567 568 s->state=SSL23_ST_CW_CLNT_HELLO_B; 569 s->init_off=0; 570 } 571 572 /* SSL3_ST_CW_CLNT_HELLO_B */ 573 ret = ssl23_write_bytes(s); 574 575 if ((ret >= 2) && s->msg_callback) 576 { 577 /* Client Hello has been sent; tell msg_callback */ 578 579 if (ssl2_compat) 580 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); 581 else 582 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); 583 } 584 585 return ret; 586 } 587 588static int ssl23_get_server_hello(SSL *s) 589 { 590 char buf[8]; 591 unsigned char *p; 592 int i; 593 int n; 594 595 n=ssl23_read_bytes(s,7); 596 597 if (n != 7) return(n); 598 p=s->packet; 599 600 memcpy(buf,p,n); 601 602 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 603 (p[5] == 0x00) && (p[6] == 0x02)) 604 { 605#ifdef OPENSSL_NO_SSL2 606 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 607 goto err; 608#else 609 /* we are talking sslv2 */ 610 /* we need to clean up the SSLv3 setup and put in the 611 * sslv2 stuff. */ 612 int ch_len; 613 614 if (s->options & SSL_OP_NO_SSLv2) 615 { 616 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 617 goto err; 618 } 619 if (s->s2 == NULL) 620 { 621 if (!ssl2_new(s)) 622 goto err; 623 } 624 else 625 ssl2_clear(s); 626 627 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 628 ch_len=SSL2_CHALLENGE_LENGTH; 629 else 630 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 631 632 /* write out sslv2 challenge */ 633 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because 634 it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or 635 SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for 636 futurproofing */ 637 i=(SSL3_RANDOM_SIZE < ch_len) 638 ?SSL3_RANDOM_SIZE:ch_len; 639 s->s2->challenge_length=i; 640 memcpy(s->s2->challenge, 641 &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); 642 643 if (s->s3 != NULL) ssl3_free(s); 644 645 if (!BUF_MEM_grow_clean(s->init_buf, 646 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 647 { 648 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); 649 goto err; 650 } 651 652 s->state=SSL2_ST_GET_SERVER_HELLO_A; 653 if (!(s->client_version == SSL2_VERSION)) 654 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 655 s->s2->ssl2_rollback=1; 656 657 /* setup the 7 bytes we have read so we get them from 658 * the sslv2 buffer */ 659 s->rstate=SSL_ST_READ_HEADER; 660 s->packet_length=n; 661 s->packet= &(s->s2->rbuf[0]); 662 memcpy(s->packet,buf,n); 663 s->s2->rbuf_left=n; 664 s->s2->rbuf_offs=0; 665 666 /* we have already written one */ 667 s->s2->write_sequence=1; 668 669 s->method=SSLv2_client_method(); 670 s->handshake_func=s->method->ssl_connect; 671#endif 672 } 673 else if (p[1] == SSL3_VERSION_MAJOR && 674 p[2] <= TLS1_2_VERSION_MINOR && 675 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 676 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) 677 { 678 /* we have sslv3 or tls1 (server hello or alert) */ 679 680 if ((p[2] == SSL3_VERSION_MINOR) && 681 !(s->options & SSL_OP_NO_SSLv3)) 682 { 683#ifdef OPENSSL_FIPS 684 if(FIPS_mode()) 685 { 686 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, 687 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 688 goto err; 689 } 690#endif 691 s->version=SSL3_VERSION; 692 s->method=SSLv3_client_method(); 693 } 694 else if ((p[2] == TLS1_VERSION_MINOR) && 695 !(s->options & SSL_OP_NO_TLSv1)) 696 { 697 s->version=TLS1_VERSION; 698 s->method=TLSv1_client_method(); 699 } 700 else if ((p[2] == TLS1_1_VERSION_MINOR) && 701 !(s->options & SSL_OP_NO_TLSv1_1)) 702 { 703 s->version=TLS1_1_VERSION; 704 s->method=TLSv1_1_client_method(); 705 } 706 else if ((p[2] == TLS1_2_VERSION_MINOR) && 707 !(s->options & SSL_OP_NO_TLSv1_2)) 708 { 709 s->version=TLS1_2_VERSION; 710 s->method=TLSv1_2_client_method(); 711 } 712 else 713 { 714 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 715 goto err; 716 } 717 718 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) 719 { 720 /* fatal alert */ 721 722 void (*cb)(const SSL *ssl,int type,int val)=NULL; 723 int j; 724 725 if (s->info_callback != NULL) 726 cb=s->info_callback; 727 else if (s->ctx->info_callback != NULL) 728 cb=s->ctx->info_callback; 729 730 i=p[5]; 731 if (cb != NULL) 732 { 733 j=(i<<8)|p[6]; 734 cb(s,SSL_CB_READ_ALERT,j); 735 } 736 737 if (s->msg_callback) 738 s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg); 739 740 s->rwstate=SSL_NOTHING; 741 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 742 goto err; 743 } 744 745 if (!ssl_init_wbio_buffer(s,1)) goto err; 746 747 /* we are in this state */ 748 s->state=SSL3_ST_CR_SRVR_HELLO_A; 749 750 /* put the 7 bytes we have read into the input buffer 751 * for SSLv3 */ 752 s->rstate=SSL_ST_READ_HEADER; 753 s->packet_length=n; 754 if (s->s3->rbuf.buf == NULL) 755 if (!ssl3_setup_read_buffer(s)) 756 goto err; 757 s->packet= &(s->s3->rbuf.buf[0]); 758 memcpy(s->packet,buf,n); 759 s->s3->rbuf.left=n; 760 s->s3->rbuf.offset=0; 761 762 s->handshake_func=s->method->ssl_connect; 763 } 764 else 765 { 766 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 767 goto err; 768 } 769 s->init_num=0; 770 771 /* Since, if we are sending a ssl23 client hello, we are not 772 * reusing a session-id */ 773 if (!ssl_get_new_session(s,0)) 774 goto err; 775 776 return(SSL_connect(s)); 777err: 778 return(-1); 779 } 780