1 /* ssl/s23_clnt.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh (at) 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> 118 119 static const SSL_METHOD *ssl23_get_client_method(int ver); 120 static int ssl23_client_hello(SSL *s); 121 static int ssl23_get_server_hello(SSL *s); 122 static 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 } 139 140 IMPLEMENT_ssl23_meth_func(SSLv23_client_method, 141 ssl_undefined_function, 142 ssl23_connect, 143 ssl23_get_client_method) 144 145 int 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 } 248 end: 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 } 256 257 static 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 } 271 272 /* Fill a ClientRandom or ServerRandom field of length len. Returns <= 0 273 * on failure, 1 on success. */ 274 int ssl_fill_hello_random(SSL *s, int server, unsigned char *result, int len) 275 { 276 int send_time = 0; 277 278 if (len < 4) 279 return 0; 280 if (server) 281 send_time = (s->mode & SSL_MODE_SEND_SERVERHELLO_TIME) != 0; 282 else 283 send_time = (s->mode & SSL_MODE_SEND_CLIENTHELLO_TIME) != 0; 284 if (send_time) 285 { 286 unsigned long Time = (unsigned long)time(NULL); 287 unsigned char *p = result; 288 l2n(Time, p); 289 return RAND_pseudo_bytes(p, len-4); 290 } 291 else 292 return RAND_pseudo_bytes(result, len); 293 } 294 295 static int ssl23_client_hello(SSL *s) 296 { 297 unsigned char *buf; 298 unsigned char *p,*d; 299 int i,ch_len; 300 unsigned long l; 301 int ssl2_compat; 302 int version = 0, version_major, version_minor; 303 #ifndef OPENSSL_NO_COMP 304 int j; 305 SSL_COMP *comp; 306 #endif 307 int ret; 308 unsigned long mask, options = s->options; 309 310 ssl2_compat = (options & SSL_OP_NO_SSLv2) ? 0 : 1; 311 312 if (ssl2_compat && ssl23_no_ssl2_ciphers(s)) 313 ssl2_compat = 0; 314 315 /* 316 * SSL_OP_NO_X disables all protocols above X *if* there are 317 * some protocols below X enabled. This is required in order 318 * to maintain "version capability" vector contiguous. So 319 * that if application wants to disable TLS1.0 in favour of 320 * TLS1>=1, it would be insufficient to pass SSL_NO_TLSv1, the 321 * answer is SSL_OP_NO_TLSv1|SSL_OP_NO_SSLv3|SSL_OP_NO_SSLv2. 322 */ 323 mask = SSL_OP_NO_TLSv1_1|SSL_OP_NO_TLSv1 324 #if !defined(OPENSSL_NO_SSL3) 325 |SSL_OP_NO_SSLv3 326 #endif 327 #if !defined(OPENSSL_NO_SSL2) 328 |(ssl2_compat?SSL_OP_NO_SSLv2:0) 329 #endif 330 ; 331 #if !defined(OPENSSL_NO_TLS1_2_CLIENT) 332 version = TLS1_2_VERSION; 333 334 if ((options & SSL_OP_NO_TLSv1_2) && (options & mask) != mask) 335 version = TLS1_1_VERSION; 336 #else 337 version = TLS1_1_VERSION; 338 #endif 339 mask &= ~SSL_OP_NO_TLSv1_1; 340 if ((options & SSL_OP_NO_TLSv1_1) && (options & mask) != mask) 341 version = TLS1_VERSION; 342 mask &= ~SSL_OP_NO_TLSv1; 343 #if !defined(OPENSSL_NO_SSL3) 344 if ((options & SSL_OP_NO_TLSv1) && (options & mask) != mask) 345 version = SSL3_VERSION; 346 mask &= ~SSL_OP_NO_SSLv3; 347 #endif 348 #if !defined(OPENSSL_NO_SSL2) 349 if ((options & SSL_OP_NO_SSLv3) && (options & mask) != mask) 350 version = SSL2_VERSION; 351 #endif 352 353 #ifndef OPENSSL_NO_TLSEXT 354 if (version != SSL2_VERSION) 355 { 356 /* have to disable SSL 2.0 compatibility if we need TLS extensions */ 357 358 if (s->tlsext_hostname != NULL) 359 ssl2_compat = 0; 360 if (s->tlsext_status_type != -1) 361 ssl2_compat = 0; 362 #ifdef TLSEXT_TYPE_opaque_prf_input 363 if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL) 364 ssl2_compat = 0; 365 #endif 366 } 367 #endif 368 369 buf=(unsigned char *)s->init_buf->data; 370 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) 371 { 372 #if 0 373 /* don't reuse session-id's */ 374 if (!ssl_get_new_session(s,0)) 375 { 376 return(-1); 377 } 378 #endif 379 380 p=s->s3->client_random; 381 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0) 382 return -1; 383 384 if (version == TLS1_2_VERSION) 385 { 386 version_major = TLS1_2_VERSION_MAJOR; 387 version_minor = TLS1_2_VERSION_MINOR; 388 } 389 else if (version == TLS1_1_VERSION) 390 { 391 version_major = TLS1_1_VERSION_MAJOR; 392 version_minor = TLS1_1_VERSION_MINOR; 393 } 394 else if (version == TLS1_VERSION) 395 { 396 version_major = TLS1_VERSION_MAJOR; 397 version_minor = TLS1_VERSION_MINOR; 398 } 399 #ifdef OPENSSL_FIPS 400 else if(FIPS_mode()) 401 { 402 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 403 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 404 return -1; 405 } 406 #endif 407 else if (version == SSL3_VERSION) 408 { 409 version_major = SSL3_VERSION_MAJOR; 410 version_minor = SSL3_VERSION_MINOR; 411 } 412 else if (version == SSL2_VERSION) 413 { 414 version_major = SSL2_VERSION_MAJOR; 415 version_minor = SSL2_VERSION_MINOR; 416 } 417 else 418 { 419 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); 420 return(-1); 421 } 422 423 s->client_version = version; 424 425 if (ssl2_compat) 426 { 427 /* create SSL 2.0 compatible Client Hello */ 428 429 /* two byte record header will be written last */ 430 d = &(buf[2]); 431 p = d + 9; /* leave space for message type, version, individual length fields */ 432 433 *(d++) = SSL2_MT_CLIENT_HELLO; 434 *(d++) = version_major; 435 *(d++) = version_minor; 436 437 /* Ciphers supported */ 438 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); 439 if (i == 0) 440 { 441 /* no ciphers */ 442 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 443 return -1; 444 } 445 s2n(i,d); 446 p+=i; 447 448 /* put in the session-id length (zero since there is no reuse) */ 449 #if 0 450 s->session->session_id_length=0; 451 #endif 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 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), 461 because it is one of SSL2_MAX_CHALLENGE_LENGTH (32) 462 or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the 463 check in for futurproofing */ 464 if (SSL3_RANDOM_SIZE < ch_len) 465 i=SSL3_RANDOM_SIZE; 466 else 467 i=ch_len; 468 s2n(i,d); 469 memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); 470 if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 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 } 486 else 487 { 488 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 489 490 /* do the record header (5 bytes) and handshake message header (4 bytes) last */ 491 d = p = &(buf[9]); 492 493 *(p++) = version_major; 494 *(p++) = version_minor; 495 496 /* Random stuff */ 497 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 498 p += SSL3_RANDOM_SIZE; 499 500 /* Session ID (zero since there is no reuse) */ 501 *(p++) = 0; 502 503 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 504 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); 505 if (i == 0) 506 { 507 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); 508 return -1; 509 } 510 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 511 /* Some servers hang if client hello > 256 bytes 512 * as hack workaround chop number of supported ciphers 513 * to keep it well below this if we use TLS v1.2 514 */ 515 if (TLS1_get_version(s) >= TLS1_2_VERSION 516 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) 517 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; 518 #endif 519 s2n(i,p); 520 p+=i; 521 522 /* COMPRESSION */ 523 #ifdef OPENSSL_NO_COMP 524 *(p++)=1; 525 #else 526 if ((s->options & SSL_OP_NO_COMPRESSION) 527 || !s->ctx->comp_methods) 528 j=0; 529 else 530 j=sk_SSL_COMP_num(s->ctx->comp_methods); 531 *(p++)=1+j; 532 for (i=0; i<j; i++) 533 { 534 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); 535 *(p++)=comp->id; 536 } 537 #endif 538 *(p++)=0; /* Add the NULL method */ 539 540 #ifndef OPENSSL_NO_TLSEXT 541 /* TLS extensions*/ 542 if (ssl_prepare_clienthello_tlsext(s) <= 0) 543 { 544 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); 545 return -1; 546 } 547 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 548 { 549 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 550 return -1; 551 } 552 #endif 553 554 l = p-d; 555 556 /* fill in 4-byte handshake header */ 557 d=&(buf[5]); 558 *(d++)=SSL3_MT_CLIENT_HELLO; 559 l2n3(l,d); 560 561 l += 4; 562 563 if (l > SSL3_RT_MAX_PLAIN_LENGTH) 564 { 565 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); 566 return -1; 567 } 568 569 /* fill in 5-byte record header */ 570 d=buf; 571 *(d++) = SSL3_RT_HANDSHAKE; 572 *(d++) = version_major; 573 /* Some servers hang if we use long client hellos 574 * and a record number > TLS 1.0. 575 */ 576 if (TLS1_get_client_version(s) > TLS1_VERSION) 577 *(d++) = 1; 578 else 579 *(d++) = version_minor; 580 s2n((int)l,d); 581 582 /* number of bytes to write */ 583 s->init_num=p-buf; 584 s->init_off=0; 585 586 ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); 587 } 588 589 s->state=SSL23_ST_CW_CLNT_HELLO_B; 590 s->init_off=0; 591 } 592 593 /* SSL3_ST_CW_CLNT_HELLO_B */ 594 ret = ssl23_write_bytes(s); 595 596 if ((ret >= 2) && s->msg_callback) 597 { 598 /* Client Hello has been sent; tell msg_callback */ 599 600 if (ssl2_compat) 601 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); 602 else 603 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); 604 } 605 606 return ret; 607 } 608 609 static int ssl23_get_server_hello(SSL *s) 610 { 611 char buf[8]; 612 unsigned char *p; 613 int i; 614 int n; 615 616 n=ssl23_read_bytes(s,7); 617 618 if (n != 7) return(n); 619 p=s->packet; 620 621 memcpy(buf,p,n); 622 623 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 624 (p[5] == 0x00) && (p[6] == 0x02)) 625 { 626 #ifdef OPENSSL_NO_SSL2 627 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 628 goto err; 629 #else 630 /* we are talking sslv2 */ 631 /* we need to clean up the SSLv3 setup and put in the 632 * sslv2 stuff. */ 633 int ch_len; 634 635 if (s->options & SSL_OP_NO_SSLv2) 636 { 637 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 638 goto err; 639 } 640 if (s->s2 == NULL) 641 { 642 if (!ssl2_new(s)) 643 goto err; 644 } 645 else 646 ssl2_clear(s); 647 648 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 649 ch_len=SSL2_CHALLENGE_LENGTH; 650 else 651 ch_len=SSL2_MAX_CHALLENGE_LENGTH; 652 653 /* write out sslv2 challenge */ 654 /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because 655 it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or 656 SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for 657 futurproofing */ 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) ssl3_free(s); 665 666 if (!BUF_MEM_grow_clean(s->init_buf, 667 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) 668 { 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 /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ 676 s->s2->ssl2_rollback=1; 677 678 /* setup the 7 bytes we have read so we get them from 679 * the sslv2 buffer */ 680 s->rstate=SSL_ST_READ_HEADER; 681 s->packet_length=n; 682 s->packet= &(s->s2->rbuf[0]); 683 memcpy(s->packet,buf,n); 684 s->s2->rbuf_left=n; 685 s->s2->rbuf_offs=0; 686 687 /* we have already written one */ 688 s->s2->write_sequence=1; 689 690 s->method=SSLv2_client_method(); 691 s->handshake_func=s->method->ssl_connect; 692 #endif 693 } 694 else if (p[1] == SSL3_VERSION_MAJOR && 695 p[2] <= TLS1_2_VERSION_MINOR && 696 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 697 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) 698 { 699 /* we have sslv3 or tls1 (server hello or alert) */ 700 701 if ((p[2] == SSL3_VERSION_MINOR) && 702 !(s->options & SSL_OP_NO_SSLv3)) 703 { 704 #ifdef OPENSSL_FIPS 705 if(FIPS_mode()) 706 { 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 } 715 else if ((p[2] == TLS1_VERSION_MINOR) && 716 !(s->options & SSL_OP_NO_TLSv1)) 717 { 718 s->version=TLS1_VERSION; 719 s->method=TLSv1_client_method(); 720 } 721 else if ((p[2] == TLS1_1_VERSION_MINOR) && 722 !(s->options & SSL_OP_NO_TLSv1_1)) 723 { 724 s->version=TLS1_1_VERSION; 725 s->method=TLSv1_1_client_method(); 726 } 727 else if ((p[2] == TLS1_2_VERSION_MINOR) && 728 !(s->options & SSL_OP_NO_TLSv1_2)) 729 { 730 s->version=TLS1_2_VERSION; 731 s->method=TLSv1_2_client_method(); 732 } 733 else 734 { 735 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); 736 goto err; 737 } 738 739 /* ensure that TLS_MAX_VERSION is up-to-date */ 740 OPENSSL_assert(s->version <= TLS_MAX_VERSION); 741 742 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) 743 { 744 /* fatal alert */ 745 746 void (*cb)(const SSL *ssl,int type,int val)=NULL; 747 int j; 748 749 if (s->info_callback != NULL) 750 cb=s->info_callback; 751 else if (s->ctx->info_callback != NULL) 752 cb=s->ctx->info_callback; 753 754 i=p[5]; 755 if (cb != NULL) 756 { 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_ALERT, p+5, 2, s, s->msg_callback_arg); 763 764 s->rwstate=SSL_NOTHING; 765 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); 766 goto err; 767 } 768 769 if (!ssl_init_wbio_buffer(s,1)) goto err; 770 771 /* we are in this state */ 772 s->state=SSL3_ST_CR_SRVR_HELLO_A; 773 774 /* put the 7 bytes we have read into the input buffer 775 * for SSLv3 */ 776 s->rstate=SSL_ST_READ_HEADER; 777 s->packet_length=n; 778 if (s->s3->rbuf.buf == NULL) 779 if (!ssl3_setup_read_buffer(s)) 780 goto err; 781 s->packet= &(s->s3->rbuf.buf[0]); 782 memcpy(s->packet,buf,n); 783 s->s3->rbuf.left=n; 784 s->s3->rbuf.offset=0; 785 786 s->handshake_func=s->method->ssl_connect; 787 } 788 else 789 { 790 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); 791 goto err; 792 } 793 s->init_num=0; 794 795 /* Since, if we are sending a ssl23 client hello, we are not 796 * reusing a session-id */ 797 if (!s->session_creation_enabled) 798 { 799 if (!(s->client_version == SSL2_VERSION)) 800 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE); 801 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED); 802 goto err; 803 } 804 if (!ssl_get_new_session(s,0)) 805 goto err; 806 807 return(SSL_connect(s)); 808 err: 809 return(-1); 810 } 811
