s23_clnt.c revision 296465
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#include <stdio.h> 60#include "ssl_locl.h" 61#include <openssl/buffer.h> 62#include <openssl/rand.h> 63#include <openssl/objects.h> 64#include <openssl/evp.h> 65 66static SSL_METHOD *ssl23_get_client_method(int ver); 67static int ssl23_client_hello(SSL *s); 68static int ssl23_get_server_hello(SSL *s); 69static SSL_METHOD *ssl23_get_client_method(int ver) 70{ 71#ifndef OPENSSL_NO_SSL2 72 if (ver == SSL2_VERSION) 73 return (SSLv2_client_method()); 74#endif 75#ifndef OPENSSL_NO_SSL3 76 if (ver == SSL3_VERSION) 77 return (SSLv3_client_method()); 78#endif 79 if (ver == TLS1_VERSION) 80 return (TLSv1_client_method()); 81 else 82 return (NULL); 83} 84 85IMPLEMENT_ssl23_meth_func(SSLv23_client_method, 86 ssl_undefined_function, 87 ssl23_connect, ssl23_get_client_method) 88 89int ssl23_connect(SSL *s) 90{ 91 BUF_MEM *buf = NULL; 92 unsigned long Time = (unsigned long)time(NULL); 93 void (*cb) (const SSL *ssl, int type, int val) = NULL; 94 int ret = -1; 95 int new_state, state; 96 97 RAND_add(&Time, sizeof(Time), 0); 98 ERR_clear_error(); 99 clear_sys_error(); 100 101 if (s->info_callback != NULL) 102 cb = s->info_callback; 103 else if (s->ctx->info_callback != NULL) 104 cb = s->ctx->info_callback; 105 106 s->in_handshake++; 107 if (!SSL_in_init(s) || SSL_in_before(s)) 108 SSL_clear(s); 109 110 for (;;) { 111 state = s->state; 112 113 switch (s->state) { 114 case SSL_ST_BEFORE: 115 case SSL_ST_CONNECT: 116 case SSL_ST_BEFORE | SSL_ST_CONNECT: 117 case SSL_ST_OK | SSL_ST_CONNECT: 118 119 if (s->session != NULL) { 120 SSLerr(SSL_F_SSL23_CONNECT, 121 SSL_R_SSL23_DOING_SESSION_ID_REUSE); 122 ret = -1; 123 goto end; 124 } 125 s->server = 0; 126 if (cb != NULL) 127 cb(s, SSL_CB_HANDSHAKE_START, 1); 128 129 /* s->version=TLS1_VERSION; */ 130 s->type = SSL_ST_CONNECT; 131 132 if (s->init_buf == NULL) { 133 if ((buf = BUF_MEM_new()) == NULL) { 134 ret = -1; 135 goto end; 136 } 137 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 138 ret = -1; 139 goto end; 140 } 141 s->init_buf = buf; 142 buf = NULL; 143 } 144 145 if (!ssl3_setup_buffers(s)) { 146 ret = -1; 147 goto end; 148 } 149 150 ssl3_init_finished_mac(s); 151 152 s->state = SSL23_ST_CW_CLNT_HELLO_A; 153 s->ctx->stats.sess_connect++; 154 s->init_num = 0; 155 break; 156 157 case SSL23_ST_CW_CLNT_HELLO_A: 158 case SSL23_ST_CW_CLNT_HELLO_B: 159 160 s->shutdown = 0; 161 ret = ssl23_client_hello(s); 162 if (ret <= 0) 163 goto end; 164 s->state = SSL23_ST_CR_SRVR_HELLO_A; 165 s->init_num = 0; 166 167 break; 168 169 case SSL23_ST_CR_SRVR_HELLO_A: 170 case SSL23_ST_CR_SRVR_HELLO_B: 171 ret = ssl23_get_server_hello(s); 172 if (ret >= 0) 173 cb = NULL; 174 goto end; 175 /* break; */ 176 177 default: 178 SSLerr(SSL_F_SSL23_CONNECT, SSL_R_UNKNOWN_STATE); 179 ret = -1; 180 goto end; 181 /* break; */ 182 } 183 184 if (s->debug) { 185 (void)BIO_flush(s->wbio); 186 } 187 188 if ((cb != NULL) && (s->state != state)) { 189 new_state = s->state; 190 s->state = state; 191 cb(s, SSL_CB_CONNECT_LOOP, 1); 192 s->state = new_state; 193 } 194 } 195 end: 196 s->in_handshake--; 197 if (buf != NULL) 198 BUF_MEM_free(buf); 199 if (cb != NULL) 200 cb(s, SSL_CB_CONNECT_EXIT, ret); 201 return (ret); 202} 203 204static int ssl23_client_hello(SSL *s) 205{ 206 unsigned char *buf; 207 unsigned char *p, *d; 208 int i, ch_len; 209 unsigned long Time, l; 210 int ssl2_compat; 211 int version = 0, version_major, version_minor; 212#ifndef OPENSSL_NO_COMP 213 int j; 214 SSL_COMP *comp; 215#endif 216 int ret; 217 218 ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1; 219 220 if (!(s->options & SSL_OP_NO_TLSv1)) { 221 version = TLS1_VERSION; 222 } else if (!(s->options & SSL_OP_NO_SSLv3)) { 223 version = SSL3_VERSION; 224 } else if (!(s->options & SSL_OP_NO_SSLv2)) { 225 version = SSL2_VERSION; 226 } 227#ifndef OPENSSL_NO_TLSEXT 228 if (version != SSL2_VERSION) { 229 /* 230 * have to disable SSL 2.0 compatibility if we need TLS extensions 231 */ 232 233 if (s->tlsext_hostname != NULL) 234 ssl2_compat = 0; 235 if (s->tlsext_status_type != -1) 236 ssl2_compat = 0; 237 } 238#endif 239 240 buf = (unsigned char *)s->init_buf->data; 241 if (s->state == SSL23_ST_CW_CLNT_HELLO_A) { 242#if 0 243 /* don't reuse session-id's */ 244 if (!ssl_get_new_session(s, 0)) { 245 return (-1); 246 } 247#endif 248 249 p = s->s3->client_random; 250 Time = (unsigned long)time(NULL); /* Time */ 251 l2n(Time, p); 252 if (RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4) <= 0) 253 return -1; 254 255 if (version == TLS1_VERSION) { 256 version_major = TLS1_VERSION_MAJOR; 257 version_minor = TLS1_VERSION_MINOR; 258 } 259#ifdef OPENSSL_FIPS 260 else if (FIPS_mode()) { 261 SSLerr(SSL_F_SSL23_CLIENT_HELLO, 262 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 263 return -1; 264 } 265#endif 266 else if (version == SSL3_VERSION) { 267 version_major = SSL3_VERSION_MAJOR; 268 version_minor = SSL3_VERSION_MINOR; 269 } else if (version == SSL2_VERSION) { 270 version_major = SSL2_VERSION_MAJOR; 271 version_minor = SSL2_VERSION_MINOR; 272 } else { 273 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_PROTOCOLS_AVAILABLE); 274 return (-1); 275 } 276 277 s->client_version = version; 278 279 if (ssl2_compat) { 280 /* create SSL 2.0 compatible Client Hello */ 281 282 /* two byte record header will be written last */ 283 d = &(buf[2]); 284 p = d + 9; /* leave space for message type, version, 285 * individual length fields */ 286 287 *(d++) = SSL2_MT_CLIENT_HELLO; 288 *(d++) = version_major; 289 *(d++) = version_minor; 290 291 /* Ciphers supported */ 292 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), p, 0); 293 if (i == 0) { 294 /* no ciphers */ 295 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 296 return -1; 297 } 298 s2n(i, d); 299 p += i; 300 301 /* 302 * put in the session-id length (zero since there is no reuse) 303 */ 304#if 0 305 s->session->session_id_length = 0; 306#endif 307 s2n(0, d); 308 309 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 310 ch_len = SSL2_CHALLENGE_LENGTH; 311 else 312 ch_len = SSL2_MAX_CHALLENGE_LENGTH; 313 314 /* write out sslv2 challenge */ 315 if (SSL3_RANDOM_SIZE < ch_len) 316 i = SSL3_RANDOM_SIZE; 317 else 318 i = ch_len; 319 s2n(i, d); 320 memset(&(s->s3->client_random[0]), 0, SSL3_RANDOM_SIZE); 321 if (RAND_pseudo_bytes 322 (&(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i) <= 0) 323 return -1; 324 325 memcpy(p, &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i); 326 p += i; 327 328 i = p - &(buf[2]); 329 buf[0] = ((i >> 8) & 0xff) | 0x80; 330 buf[1] = (i & 0xff); 331 332 /* number of bytes to write */ 333 s->init_num = i + 2; 334 s->init_off = 0; 335 336 ssl3_finish_mac(s, &(buf[2]), i); 337 } else { 338 /* create Client Hello in SSL 3.0/TLS 1.0 format */ 339 340 /* 341 * do the record header (5 bytes) and handshake message header (4 342 * bytes) last 343 */ 344 d = p = &(buf[9]); 345 346 *(p++) = version_major; 347 *(p++) = version_minor; 348 349 /* Random stuff */ 350 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 351 p += SSL3_RANDOM_SIZE; 352 353 /* Session ID (zero since there is no reuse) */ 354 *(p++) = 0; 355 356 /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ 357 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 358 ssl3_put_cipher_by_char); 359 if (i == 0) { 360 SSLerr(SSL_F_SSL23_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 361 return -1; 362 } 363 s2n(i, p); 364 p += i; 365#ifdef OPENSSL_NO_COMP 366 *(p++) = 1; 367#else 368 /* COMPRESSION */ 369 if (s->ctx->comp_methods == NULL) 370 j = 0; 371 else 372 j = sk_SSL_COMP_num(s->ctx->comp_methods); 373 *(p++) = 1 + j; 374 for (i = 0; i < j; i++) { 375 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 376 *(p++) = comp->id; 377 } 378#endif 379 *(p++) = 0; /* Add the NULL method */ 380#ifndef OPENSSL_NO_TLSEXT 381 if ((p = 382 ssl_add_clienthello_tlsext(s, p, 383 buf + 384 SSL3_RT_MAX_PLAIN_LENGTH)) == 385 NULL) { 386 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 387 return -1; 388 } 389#endif 390 391 l = p - d; 392 *p = 42; 393 394 /* fill in 4-byte handshake header */ 395 d = &(buf[5]); 396 *(d++) = SSL3_MT_CLIENT_HELLO; 397 l2n3(l, d); 398 399 l += 4; 400 401 if (l > SSL3_RT_MAX_PLAIN_LENGTH) { 402 SSLerr(SSL_F_SSL23_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 403 return -1; 404 } 405 406 /* fill in 5-byte record header */ 407 d = buf; 408 *(d++) = SSL3_RT_HANDSHAKE; 409 *(d++) = version_major; 410 *(d++) = version_minor; /* arguably we should send the *lowest* 411 * suported version here (indicating, 412 * e.g., TLS 1.0 in "SSL 3.0 format") */ 413 s2n((int)l, d); 414 415 /* number of bytes to write */ 416 s->init_num = p - buf; 417 s->init_off = 0; 418 419 ssl3_finish_mac(s, &(buf[5]), s->init_num - 5); 420 } 421 422 s->state = SSL23_ST_CW_CLNT_HELLO_B; 423 s->init_off = 0; 424 } 425 426 /* SSL3_ST_CW_CLNT_HELLO_B */ 427 ret = ssl23_write_bytes(s); 428 429 if ((ret >= 2) && s->msg_callback) { 430 /* Client Hello has been sent; tell msg_callback */ 431 432 if (ssl2_compat) 433 s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data + 2, 434 ret - 2, s, s->msg_callback_arg); 435 else 436 s->msg_callback(1, version, SSL3_RT_HANDSHAKE, 437 s->init_buf->data + 5, ret - 5, s, 438 s->msg_callback_arg); 439 } 440 441 return ret; 442} 443 444static int ssl23_get_server_hello(SSL *s) 445{ 446 char buf[8]; 447 unsigned char *p; 448 int i; 449 int n; 450 451 n = ssl23_read_bytes(s, 7); 452 453 if (n != 7) 454 return (n); 455 p = s->packet; 456 457 memcpy(buf, p, n); 458 459 if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && 460 (p[5] == 0x00) && (p[6] == 0x02)) { 461#ifdef OPENSSL_NO_SSL2 462 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 463 goto err; 464#else 465 /* we are talking sslv2 */ 466 /* 467 * we need to clean up the SSLv3 setup and put in the sslv2 stuff. 468 */ 469 int ch_len; 470 471 if (s->options & SSL_OP_NO_SSLv2) { 472 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 473 goto err; 474 } 475 if (s->s2 == NULL) { 476 if (!ssl2_new(s)) 477 goto err; 478 } else 479 ssl2_clear(s); 480 481 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) 482 ch_len = SSL2_CHALLENGE_LENGTH; 483 else 484 ch_len = SSL2_MAX_CHALLENGE_LENGTH; 485 486 /* write out sslv2 challenge */ 487 i = (SSL3_RANDOM_SIZE < ch_len) 488 ? SSL3_RANDOM_SIZE : ch_len; 489 s->s2->challenge_length = i; 490 memcpy(s->s2->challenge, 491 &(s->s3->client_random[SSL3_RANDOM_SIZE - i]), i); 492 493 if (s->s3 != NULL) 494 ssl3_free(s); 495 496 if (!BUF_MEM_grow_clean(s->init_buf, 497 SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { 498 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, ERR_R_BUF_LIB); 499 goto err; 500 } 501 502 s->state = SSL2_ST_GET_SERVER_HELLO_A; 503 if (!(s->client_version == SSL2_VERSION)) 504 /* 505 * use special padding (SSL 3.0 draft/RFC 2246, App. E.2) 506 */ 507 s->s2->ssl2_rollback = 1; 508 509 /* 510 * setup the 7 bytes we have read so we get them from the sslv2 511 * buffer 512 */ 513 s->rstate = SSL_ST_READ_HEADER; 514 s->packet_length = n; 515 s->packet = &(s->s2->rbuf[0]); 516 memcpy(s->packet, buf, n); 517 s->s2->rbuf_left = n; 518 s->s2->rbuf_offs = 0; 519 520 /* we have already written one */ 521 s->s2->write_sequence = 1; 522 523 s->method = SSLv2_client_method(); 524 s->handshake_func = s->method->ssl_connect; 525#endif 526 } else if (p[1] == SSL3_VERSION_MAJOR && 527 ((p[2] == SSL3_VERSION_MINOR) || 528 (p[2] == TLS1_VERSION_MINOR)) && 529 ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || 530 (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) { 531 /* we have sslv3 or tls1 (server hello or alert) */ 532 533#ifndef OPENSSL_NO_SSL3 534 if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) { 535# ifdef OPENSSL_FIPS 536 if (FIPS_mode()) { 537 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, 538 SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE); 539 goto err; 540 } 541# endif 542 s->version = SSL3_VERSION; 543 s->method = SSLv3_client_method(); 544 } else 545#endif 546 if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) { 547 s->version = TLS1_VERSION; 548 s->method = TLSv1_client_method(); 549 } else { 550 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNSUPPORTED_PROTOCOL); 551 goto err; 552 } 553 554 /* ensure that TLS_MAX_VERSION is up-to-date */ 555 OPENSSL_assert(s->version <= TLS_MAX_VERSION); 556 557 if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) { 558 /* fatal alert */ 559 560 void (*cb) (const SSL *ssl, int type, int val) = NULL; 561 int j; 562 563 if (s->info_callback != NULL) 564 cb = s->info_callback; 565 else if (s->ctx->info_callback != NULL) 566 cb = s->ctx->info_callback; 567 568 i = p[5]; 569 if (cb != NULL) { 570 j = (i << 8) | p[6]; 571 cb(s, SSL_CB_READ_ALERT, j); 572 } 573 574 if (s->msg_callback) 575 s->msg_callback(0, s->version, SSL3_RT_ALERT, p + 5, 2, s, 576 s->msg_callback_arg); 577 578 s->rwstate = SSL_NOTHING; 579 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_AD_REASON_OFFSET + p[6]); 580 goto err; 581 } 582 583 if (!ssl_init_wbio_buffer(s, 1)) 584 goto err; 585 586 /* we are in this state */ 587 s->state = SSL3_ST_CR_SRVR_HELLO_A; 588 589 /* 590 * put the 7 bytes we have read into the input buffer for SSLv3 591 */ 592 s->rstate = SSL_ST_READ_HEADER; 593 s->packet_length = n; 594 if (s->s3->rbuf.buf == NULL) 595 if (!ssl3_setup_buffers(s)) 596 goto err; 597 s->packet = &(s->s3->rbuf.buf[0]); 598 memcpy(s->packet, buf, n); 599 s->s3->rbuf.left = n; 600 s->s3->rbuf.offset = 0; 601 602 s->handshake_func = s->method->ssl_connect; 603 } else { 604 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO, SSL_R_UNKNOWN_PROTOCOL); 605 goto err; 606 } 607 s->init_num = 0; 608 609 /* 610 * Since, if we are sending a ssl23 client hello, we are not reusing a 611 * session-id 612 */ 613 if (!ssl_get_new_session(s, 0)) 614 goto err; 615 616 return (SSL_connect(s)); 617 err: 618 return (-1); 619} 620