s2_clnt.c revision 296465
1/* ssl/s2_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) 1998-2001 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 "ssl_locl.h" 113#ifndef OPENSSL_NO_SSL2 114# include <stdio.h> 115# include <openssl/rand.h> 116# include <openssl/buffer.h> 117# include <openssl/objects.h> 118# include <openssl/evp.h> 119 120static SSL_METHOD *ssl2_get_client_method(int ver); 121static int get_server_finished(SSL *s); 122static int get_server_verify(SSL *s); 123static int get_server_hello(SSL *s); 124static int client_hello(SSL *s); 125static int client_master_key(SSL *s); 126static int client_finished(SSL *s); 127static int client_certificate(SSL *s); 128static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from, 129 unsigned char *to, int padding); 130# define BREAK break 131 132static SSL_METHOD *ssl2_get_client_method(int ver) 133{ 134 if (ver == SSL2_VERSION) 135 return (SSLv2_client_method()); 136 else 137 return (NULL); 138} 139 140IMPLEMENT_ssl2_meth_func(SSLv2_client_method, 141 ssl_undefined_function, 142 ssl2_connect, ssl2_get_client_method) 143 144int ssl2_connect(SSL *s) 145{ 146 unsigned long l = (unsigned long)time(NULL); 147 BUF_MEM *buf = NULL; 148 int ret = -1; 149 void (*cb) (const SSL *ssl, int type, int val) = NULL; 150 int new_state, state; 151 152 RAND_add(&l, sizeof(l), 0); 153 ERR_clear_error(); 154 clear_sys_error(); 155 156 if (s->info_callback != NULL) 157 cb = s->info_callback; 158 else if (s->ctx->info_callback != NULL) 159 cb = s->ctx->info_callback; 160 161 /* init things to blank */ 162 s->in_handshake++; 163 if (!SSL_in_init(s) || SSL_in_before(s)) 164 SSL_clear(s); 165 166 for (;;) { 167 state = s->state; 168 169 switch (s->state) { 170 case SSL_ST_BEFORE: 171 case SSL_ST_CONNECT: 172 case SSL_ST_BEFORE | SSL_ST_CONNECT: 173 case SSL_ST_OK | SSL_ST_CONNECT: 174 175 s->server = 0; 176 if (cb != NULL) 177 cb(s, SSL_CB_HANDSHAKE_START, 1); 178 179 s->version = SSL2_VERSION; 180 s->type = SSL_ST_CONNECT; 181 182 buf = s->init_buf; 183 if ((buf == NULL) && ((buf = BUF_MEM_new()) == NULL)) { 184 ret = -1; 185 goto end; 186 } 187 if (!BUF_MEM_grow(buf, SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { 188 if (buf == s->init_buf) 189 buf = NULL; 190 ret = -1; 191 goto end; 192 } 193 s->init_buf = buf; 194 buf = NULL; 195 s->init_num = 0; 196 s->state = SSL2_ST_SEND_CLIENT_HELLO_A; 197 s->ctx->stats.sess_connect++; 198 s->handshake_func = ssl2_connect; 199 BREAK; 200 201 case SSL2_ST_SEND_CLIENT_HELLO_A: 202 case SSL2_ST_SEND_CLIENT_HELLO_B: 203 s->shutdown = 0; 204 ret = client_hello(s); 205 if (ret <= 0) 206 goto end; 207 s->init_num = 0; 208 s->state = SSL2_ST_GET_SERVER_HELLO_A; 209 BREAK; 210 211 case SSL2_ST_GET_SERVER_HELLO_A: 212 case SSL2_ST_GET_SERVER_HELLO_B: 213 ret = get_server_hello(s); 214 if (ret <= 0) 215 goto end; 216 s->init_num = 0; 217 if (!s->hit) { /* new session */ 218 s->state = SSL2_ST_SEND_CLIENT_MASTER_KEY_A; 219 BREAK; 220 } else { 221 s->state = SSL2_ST_CLIENT_START_ENCRYPTION; 222 break; 223 } 224 225 case SSL2_ST_SEND_CLIENT_MASTER_KEY_A: 226 case SSL2_ST_SEND_CLIENT_MASTER_KEY_B: 227 ret = client_master_key(s); 228 if (ret <= 0) 229 goto end; 230 s->init_num = 0; 231 s->state = SSL2_ST_CLIENT_START_ENCRYPTION; 232 break; 233 234 case SSL2_ST_CLIENT_START_ENCRYPTION: 235 /* 236 * Ok, we now have all the stuff needed to start encrypting, so 237 * lets fire it up :-) 238 */ 239 if (!ssl2_enc_init(s, 1)) { 240 ret = -1; 241 goto end; 242 } 243 s->s2->clear_text = 0; 244 s->state = SSL2_ST_SEND_CLIENT_FINISHED_A; 245 break; 246 247 case SSL2_ST_SEND_CLIENT_FINISHED_A: 248 case SSL2_ST_SEND_CLIENT_FINISHED_B: 249 ret = client_finished(s); 250 if (ret <= 0) 251 goto end; 252 s->init_num = 0; 253 s->state = SSL2_ST_GET_SERVER_VERIFY_A; 254 break; 255 256 case SSL2_ST_GET_SERVER_VERIFY_A: 257 case SSL2_ST_GET_SERVER_VERIFY_B: 258 ret = get_server_verify(s); 259 if (ret <= 0) 260 goto end; 261 s->init_num = 0; 262 s->state = SSL2_ST_GET_SERVER_FINISHED_A; 263 break; 264 265 case SSL2_ST_GET_SERVER_FINISHED_A: 266 case SSL2_ST_GET_SERVER_FINISHED_B: 267 ret = get_server_finished(s); 268 if (ret <= 0) 269 goto end; 270 break; 271 272 case SSL2_ST_SEND_CLIENT_CERTIFICATE_A: 273 case SSL2_ST_SEND_CLIENT_CERTIFICATE_B: 274 case SSL2_ST_SEND_CLIENT_CERTIFICATE_C: 275 case SSL2_ST_SEND_CLIENT_CERTIFICATE_D: 276 case SSL2_ST_X509_GET_CLIENT_CERTIFICATE: 277 ret = client_certificate(s); 278 if (ret <= 0) 279 goto end; 280 s->init_num = 0; 281 s->state = SSL2_ST_GET_SERVER_FINISHED_A; 282 break; 283 284 case SSL_ST_OK: 285 if (s->init_buf != NULL) { 286 BUF_MEM_free(s->init_buf); 287 s->init_buf = NULL; 288 } 289 s->init_num = 0; 290 /* ERR_clear_error(); */ 291 292 /* 293 * If we want to cache session-ids in the client and we 294 * successfully add the session-id to the cache, and there is a 295 * callback, then pass it out. 26/11/96 - eay - only add if not a 296 * re-used session. 297 */ 298 299 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 300 if (s->hit) 301 s->ctx->stats.sess_hit++; 302 303 ret = 1; 304 /* s->server=0; */ 305 s->ctx->stats.sess_connect_good++; 306 307 if (cb != NULL) 308 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 309 310 goto end; 311 /* break; */ 312 default: 313 SSLerr(SSL_F_SSL2_CONNECT, SSL_R_UNKNOWN_STATE); 314 return (-1); 315 /* break; */ 316 } 317 318 if ((cb != NULL) && (s->state != state)) { 319 new_state = s->state; 320 s->state = state; 321 cb(s, SSL_CB_CONNECT_LOOP, 1); 322 s->state = new_state; 323 } 324 } 325 end: 326 s->in_handshake--; 327 if (buf != NULL) 328 BUF_MEM_free(buf); 329 if (cb != NULL) 330 cb(s, SSL_CB_CONNECT_EXIT, ret); 331 return (ret); 332} 333 334static int get_server_hello(SSL *s) 335{ 336 unsigned char *buf; 337 unsigned char *p; 338 int i, j; 339 unsigned long len; 340 STACK_OF(SSL_CIPHER) *sk = NULL, *cl, *prio, *allow; 341 342 buf = (unsigned char *)s->init_buf->data; 343 p = buf; 344 if (s->state == SSL2_ST_GET_SERVER_HELLO_A) { 345 i = ssl2_read(s, (char *)&(buf[s->init_num]), 11 - s->init_num); 346 if (i < (11 - s->init_num)) 347 return (ssl2_part_read(s, SSL_F_GET_SERVER_HELLO, i)); 348 s->init_num = 11; 349 350 if (*(p++) != SSL2_MT_SERVER_HELLO) { 351 if (p[-1] != SSL2_MT_ERROR) { 352 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 353 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_READ_WRONG_PACKET_TYPE); 354 } else 355 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_PEER_ERROR); 356 return (-1); 357 } 358# ifdef __APPLE_CC__ 359 /* 360 * The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug workaround. 361 * <appro@fy.chalmers.se> 362 */ 363 s->hit = (i = *(p++)) ? 1 : 0; 364# else 365 s->hit = (*(p++)) ? 1 : 0; 366# endif 367 s->s2->tmp.cert_type = *(p++); 368 n2s(p, i); 369 if (i < s->version) 370 s->version = i; 371 n2s(p, i); 372 s->s2->tmp.cert_length = i; 373 n2s(p, i); 374 s->s2->tmp.csl = i; 375 n2s(p, i); 376 s->s2->tmp.conn_id_length = i; 377 s->state = SSL2_ST_GET_SERVER_HELLO_B; 378 } 379 380 /* SSL2_ST_GET_SERVER_HELLO_B */ 381 len = 382 11 + (unsigned long)s->s2->tmp.cert_length + 383 (unsigned long)s->s2->tmp.csl + 384 (unsigned long)s->s2->tmp.conn_id_length; 385 if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER) { 386 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_MESSAGE_TOO_LONG); 387 return -1; 388 } 389 j = (int)len - s->init_num; 390 i = ssl2_read(s, (char *)&(buf[s->init_num]), j); 391 if (i != j) 392 return (ssl2_part_read(s, SSL_F_GET_SERVER_HELLO, i)); 393 if (s->msg_callback) { 394 /* SERVER-HELLO */ 395 s->msg_callback(0, s->version, 0, buf, (size_t)len, s, 396 s->msg_callback_arg); 397 } 398 399 /* things are looking good */ 400 401 p = buf + 11; 402 if (s->hit) { 403 if (s->s2->tmp.cert_length != 0) { 404 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_REUSE_CERT_LENGTH_NOT_ZERO); 405 return (-1); 406 } 407 if (s->s2->tmp.cert_type != 0) { 408 if (!(s->options & SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG)) { 409 SSLerr(SSL_F_GET_SERVER_HELLO, 410 SSL_R_REUSE_CERT_TYPE_NOT_ZERO); 411 return (-1); 412 } 413 } 414 if (s->s2->tmp.csl != 0) { 415 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_REUSE_CIPHER_LIST_NOT_ZERO); 416 return (-1); 417 } 418 } else { 419# ifdef undef 420 /* very bad */ 421 memset(s->session->session_id, 0, 422 SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES); 423 s->session->session_id_length = 0; 424 */ 425# endif 426 /* 427 * we need to do this in case we were trying to reuse a client 428 * session but others are already reusing it. If this was a new 429 * 'blank' session ID, the session-id length will still be 0 430 */ 431 if (s->session->session_id_length > 0) { 432 if (!ssl_get_new_session(s, 0)) { 433 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 434 return (-1); 435 } 436 } 437 438 if (ssl2_set_certificate(s, s->s2->tmp.cert_type, 439 s->s2->tmp.cert_length, p) <= 0) { 440 ssl2_return_error(s, SSL2_PE_BAD_CERTIFICATE); 441 return (-1); 442 } 443 p += s->s2->tmp.cert_length; 444 445 if (s->s2->tmp.csl == 0) { 446 ssl2_return_error(s, SSL2_PE_NO_CIPHER); 447 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_NO_CIPHER_LIST); 448 return (-1); 449 } 450 451 /* 452 * We have just received a list of ciphers back from the server. We 453 * need to get the ones that match, then select the one we want the 454 * most :-). 455 */ 456 457 /* load the ciphers */ 458 sk = ssl_bytes_to_cipher_list(s, p, s->s2->tmp.csl, 459 &s->session->ciphers); 460 p += s->s2->tmp.csl; 461 if (sk == NULL) { 462 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 463 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_MALLOC_FAILURE); 464 return (-1); 465 } 466 467 (void)sk_SSL_CIPHER_set_cmp_func(sk, ssl_cipher_ptr_id_cmp); 468 469 /* get the array of ciphers we will accept */ 470 cl = SSL_get_ciphers(s); 471 (void)sk_SSL_CIPHER_set_cmp_func(cl, ssl_cipher_ptr_id_cmp); 472 473 /* 474 * If server preference flag set, choose the first 475 * (highest priority) cipher the server sends, otherwise 476 * client preference has priority. 477 */ 478 if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE) { 479 prio = sk; 480 allow = cl; 481 } else { 482 prio = cl; 483 allow = sk; 484 } 485 /* 486 * In theory we could have ciphers sent back that we don't want to 487 * use but that does not matter since we will check against the list 488 * we originally sent and for performance reasons we should not 489 * bother to match the two lists up just to check. 490 */ 491 for (i = 0; i < sk_SSL_CIPHER_num(prio); i++) { 492 if (sk_SSL_CIPHER_find(allow, sk_SSL_CIPHER_value(prio, i)) >= 0) 493 break; 494 } 495 496 if (i >= sk_SSL_CIPHER_num(prio)) { 497 ssl2_return_error(s, SSL2_PE_NO_CIPHER); 498 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_NO_CIPHER_MATCH); 499 return (-1); 500 } 501 s->session->cipher = sk_SSL_CIPHER_value(prio, i); 502 503 if (s->session->peer != NULL) { /* can't happen */ 504 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 505 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 506 return (-1); 507 } 508 509 s->session->peer = s->session->sess_cert->peer_key->x509; 510 /* peer_key->x509 has been set by ssl2_set_certificate. */ 511 CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509); 512 } 513 514 if (s->session->sess_cert == NULL 515 || s->session->peer != s->session->sess_cert->peer_key->x509) 516 /* can't happen */ 517 { 518 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 519 SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 520 return (-1); 521 } 522 523 s->s2->conn_id_length = s->s2->tmp.conn_id_length; 524 if (s->s2->conn_id_length > sizeof s->s2->conn_id) { 525 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 526 SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_SSL2_CONNECTION_ID_TOO_LONG); 527 return -1; 528 } 529 memcpy(s->s2->conn_id, p, s->s2->tmp.conn_id_length); 530 return (1); 531} 532 533static int client_hello(SSL *s) 534{ 535 unsigned char *buf; 536 unsigned char *p, *d; 537/* CIPHER **cipher;*/ 538 int i, n, j; 539 540 buf = (unsigned char *)s->init_buf->data; 541 if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A) { 542 if ((s->session == NULL) || (s->session->ssl_version != s->version)) { 543 if (!ssl_get_new_session(s, 0)) { 544 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 545 return (-1); 546 } 547 } 548 /* else use the pre-loaded session */ 549 550 p = buf; /* header */ 551 d = p + 9; /* data section */ 552 *(p++) = SSL2_MT_CLIENT_HELLO; /* type */ 553 s2n(SSL2_VERSION, p); /* version */ 554 n = j = 0; 555 556 n = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), d, 0); 557 d += n; 558 559 if (n == 0) { 560 SSLerr(SSL_F_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 561 return (-1); 562 } 563 564 s2n(n, p); /* cipher spec num bytes */ 565 566 if ((s->session->session_id_length > 0) && 567 (s->session->session_id_length <= 568 SSL2_MAX_SSL_SESSION_ID_LENGTH)) { 569 i = s->session->session_id_length; 570 s2n(i, p); /* session id length */ 571 memcpy(d, s->session->session_id, (unsigned int)i); 572 d += i; 573 } else { 574 s2n(0, p); 575 } 576 577 s->s2->challenge_length = SSL2_CHALLENGE_LENGTH; 578 s2n(SSL2_CHALLENGE_LENGTH, p); /* challenge length */ 579 /* 580 * challenge id data 581 */ 582 if (RAND_pseudo_bytes(s->s2->challenge, SSL2_CHALLENGE_LENGTH) <= 0) 583 return -1; 584 memcpy(d, s->s2->challenge, SSL2_CHALLENGE_LENGTH); 585 d += SSL2_CHALLENGE_LENGTH; 586 587 s->state = SSL2_ST_SEND_CLIENT_HELLO_B; 588 s->init_num = d - buf; 589 s->init_off = 0; 590 } 591 /* SSL2_ST_SEND_CLIENT_HELLO_B */ 592 return (ssl2_do_write(s)); 593} 594 595static int client_master_key(SSL *s) 596{ 597 unsigned char *buf; 598 unsigned char *p, *d; 599 int clear, enc, karg, i; 600 SSL_SESSION *sess; 601 const EVP_CIPHER *c; 602 const EVP_MD *md; 603 604 buf = (unsigned char *)s->init_buf->data; 605 if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A) { 606 607 if (!ssl_cipher_get_evp(s->session, &c, &md, NULL)) { 608 ssl2_return_error(s, SSL2_PE_NO_CIPHER); 609 SSLerr(SSL_F_CLIENT_MASTER_KEY, 610 SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS); 611 return (-1); 612 } 613 sess = s->session; 614 p = buf; 615 d = p + 10; 616 *(p++) = SSL2_MT_CLIENT_MASTER_KEY; /* type */ 617 618 i = ssl_put_cipher_by_char(s, sess->cipher, p); 619 p += i; 620 621 /* make key_arg data */ 622 i = EVP_CIPHER_iv_length(c); 623 sess->key_arg_length = i; 624 if (i > SSL_MAX_KEY_ARG_LENGTH) { 625 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 626 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); 627 return -1; 628 } 629 if (i > 0) 630 if (RAND_pseudo_bytes(sess->key_arg, i) <= 0) 631 return -1; 632 633 /* make a master key */ 634 i = EVP_CIPHER_key_length(c); 635 sess->master_key_length = i; 636 if (i > 0) { 637 if (i > (int)sizeof(sess->master_key)) { 638 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 639 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); 640 return -1; 641 } 642 if (RAND_bytes(sess->master_key, i) <= 0) { 643 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 644 return (-1); 645 } 646 } 647 648 if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC) 649 enc = 8; 650 else if (SSL_C_IS_EXPORT(sess->cipher)) 651 enc = 5; 652 else 653 enc = i; 654 655 if ((int)i < enc) { 656 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 657 SSLerr(SSL_F_CLIENT_MASTER_KEY, SSL_R_CIPHER_TABLE_SRC_ERROR); 658 return (-1); 659 } 660 clear = i - enc; 661 s2n(clear, p); 662 memcpy(d, sess->master_key, (unsigned int)clear); 663 d += clear; 664 665 enc = ssl_rsa_public_encrypt(sess->sess_cert, enc, 666 &(sess->master_key[clear]), d, 667 (s-> 668 s2->ssl2_rollback) ? RSA_SSLV23_PADDING 669 : RSA_PKCS1_PADDING); 670 if (enc <= 0) { 671 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 672 SSLerr(SSL_F_CLIENT_MASTER_KEY, SSL_R_PUBLIC_KEY_ENCRYPT_ERROR); 673 return (-1); 674 } 675# ifdef PKCS1_CHECK 676 if (s->options & SSL_OP_PKCS1_CHECK_1) 677 d[1]++; 678 if (s->options & SSL_OP_PKCS1_CHECK_2) 679 sess->master_key[clear]++; 680# endif 681 s2n(enc, p); 682 d += enc; 683 karg = sess->key_arg_length; 684 s2n(karg, p); /* key arg size */ 685 if (karg > (int)sizeof(sess->key_arg)) { 686 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 687 SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR); 688 return -1; 689 } 690 memcpy(d, sess->key_arg, (unsigned int)karg); 691 d += karg; 692 693 s->state = SSL2_ST_SEND_CLIENT_MASTER_KEY_B; 694 s->init_num = d - buf; 695 s->init_off = 0; 696 } 697 698 /* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */ 699 return (ssl2_do_write(s)); 700} 701 702static int client_finished(SSL *s) 703{ 704 unsigned char *p; 705 706 if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A) { 707 p = (unsigned char *)s->init_buf->data; 708 *(p++) = SSL2_MT_CLIENT_FINISHED; 709 if (s->s2->conn_id_length > sizeof s->s2->conn_id) { 710 SSLerr(SSL_F_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR); 711 return -1; 712 } 713 memcpy(p, s->s2->conn_id, (unsigned int)s->s2->conn_id_length); 714 715 s->state = SSL2_ST_SEND_CLIENT_FINISHED_B; 716 s->init_num = s->s2->conn_id_length + 1; 717 s->init_off = 0; 718 } 719 return (ssl2_do_write(s)); 720} 721 722/* read the data and then respond */ 723static int client_certificate(SSL *s) 724{ 725 unsigned char *buf; 726 unsigned char *p, *d; 727 int i; 728 unsigned int n; 729 int cert_ch_len; 730 unsigned char *cert_ch; 731 732 buf = (unsigned char *)s->init_buf->data; 733 734 /* 735 * We have a cert associated with the SSL, so attach it to the session if 736 * it does not have one 737 */ 738 739 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A) { 740 i = ssl2_read(s, (char *)&(buf[s->init_num]), 741 SSL2_MAX_CERT_CHALLENGE_LENGTH + 2 - s->init_num); 742 if (i < (SSL2_MIN_CERT_CHALLENGE_LENGTH + 2 - s->init_num)) 743 return (ssl2_part_read(s, SSL_F_CLIENT_CERTIFICATE, i)); 744 s->init_num += i; 745 if (s->msg_callback) { 746 /* REQUEST-CERTIFICATE */ 747 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, 748 s->msg_callback_arg); 749 } 750 751 /* type=buf[0]; */ 752 /* type eq x509 */ 753 if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION) { 754 ssl2_return_error(s, SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE); 755 SSLerr(SSL_F_CLIENT_CERTIFICATE, SSL_R_BAD_AUTHENTICATION_TYPE); 756 return (-1); 757 } 758 759 if ((s->cert == NULL) || 760 (s->cert->key->x509 == NULL) || 761 (s->cert->key->privatekey == NULL)) { 762 s->state = SSL2_ST_X509_GET_CLIENT_CERTIFICATE; 763 } else 764 s->state = SSL2_ST_SEND_CLIENT_CERTIFICATE_C; 765 } 766 767 cert_ch = buf + 2; 768 cert_ch_len = s->init_num - 2; 769 770 if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE) { 771 X509 *x509 = NULL; 772 EVP_PKEY *pkey = NULL; 773 774 /* 775 * If we get an error we need to ssl->rwstate=SSL_X509_LOOKUP; 776 * return(error); We should then be retried when things are ok and we 777 * can get a cert or not 778 */ 779 780 i = 0; 781 if (s->ctx->client_cert_cb != NULL) { 782 i = s->ctx->client_cert_cb(s, &(x509), &(pkey)); 783 } 784 785 if (i < 0) { 786 s->rwstate = SSL_X509_LOOKUP; 787 return (-1); 788 } 789 s->rwstate = SSL_NOTHING; 790 791 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 792 s->state = SSL2_ST_SEND_CLIENT_CERTIFICATE_C; 793 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) { 794 i = 0; 795 } 796 X509_free(x509); 797 EVP_PKEY_free(pkey); 798 } else if (i == 1) { 799 if (x509 != NULL) 800 X509_free(x509); 801 if (pkey != NULL) 802 EVP_PKEY_free(pkey); 803 SSLerr(SSL_F_CLIENT_CERTIFICATE, 804 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 805 i = 0; 806 } 807 808 if (i == 0) { 809 /* 810 * We have no client certificate to respond with so send the 811 * correct error message back 812 */ 813 s->state = SSL2_ST_SEND_CLIENT_CERTIFICATE_B; 814 p = buf; 815 *(p++) = SSL2_MT_ERROR; 816 s2n(SSL2_PE_NO_CERTIFICATE, p); 817 s->init_off = 0; 818 s->init_num = 3; 819 /* Write is done at the end */ 820 } 821 } 822 823 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B) { 824 return (ssl2_do_write(s)); 825 } 826 827 if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C) { 828 EVP_MD_CTX ctx; 829 830 /* 831 * ok, now we calculate the checksum do it first so we can reuse buf 832 * :-) 833 */ 834 p = buf; 835 EVP_MD_CTX_init(&ctx); 836 EVP_SignInit_ex(&ctx, s->ctx->rsa_md5, NULL); 837 EVP_SignUpdate(&ctx, s->s2->key_material, s->s2->key_material_length); 838 EVP_SignUpdate(&ctx, cert_ch, (unsigned int)cert_ch_len); 839 n = i2d_X509(s->session->sess_cert->peer_key->x509, &p); 840 EVP_SignUpdate(&ctx, buf, (unsigned int)n); 841 842 p = buf; 843 d = p + 6; 844 *(p++) = SSL2_MT_CLIENT_CERTIFICATE; 845 *(p++) = SSL2_CT_X509_CERTIFICATE; 846 n = i2d_X509(s->cert->key->x509, &d); 847 s2n(n, p); 848 849 if (!EVP_SignFinal(&ctx, d, &n, s->cert->key->privatekey)) { 850 /* 851 * this is not good. If things have failed it means there so 852 * something wrong with the key. We will continue with a 0 length 853 * signature 854 */ 855 } 856 EVP_MD_CTX_cleanup(&ctx); 857 s2n(n, p); 858 d += n; 859 860 s->state = SSL2_ST_SEND_CLIENT_CERTIFICATE_D; 861 s->init_num = d - buf; 862 s->init_off = 0; 863 } 864 /* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */ 865 return (ssl2_do_write(s)); 866} 867 868static int get_server_verify(SSL *s) 869{ 870 unsigned char *p; 871 int i, n, len; 872 873 p = (unsigned char *)s->init_buf->data; 874 if (s->state == SSL2_ST_GET_SERVER_VERIFY_A) { 875 i = ssl2_read(s, (char *)&(p[s->init_num]), 1 - s->init_num); 876 if (i < (1 - s->init_num)) 877 return (ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i)); 878 s->init_num += i; 879 880 s->state = SSL2_ST_GET_SERVER_VERIFY_B; 881 if (*p != SSL2_MT_SERVER_VERIFY) { 882 if (p[0] != SSL2_MT_ERROR) { 883 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 884 SSLerr(SSL_F_GET_SERVER_VERIFY, SSL_R_READ_WRONG_PACKET_TYPE); 885 } else { 886 SSLerr(SSL_F_GET_SERVER_VERIFY, SSL_R_PEER_ERROR); 887 /* try to read the error message */ 888 i = ssl2_read(s, (char *)&(p[s->init_num]), 3 - s->init_num); 889 return ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i); 890 } 891 return (-1); 892 } 893 } 894 895 p = (unsigned char *)s->init_buf->data; 896 len = 1 + s->s2->challenge_length; 897 n = len - s->init_num; 898 i = ssl2_read(s, (char *)&(p[s->init_num]), n); 899 if (i < n) 900 return (ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i)); 901 if (s->msg_callback) { 902 /* SERVER-VERIFY */ 903 s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); 904 } 905 p += 1; 906 907 if (CRYPTO_memcmp(p, s->s2->challenge, s->s2->challenge_length) != 0) { 908 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 909 SSLerr(SSL_F_GET_SERVER_VERIFY, SSL_R_CHALLENGE_IS_DIFFERENT); 910 return (-1); 911 } 912 return (1); 913} 914 915static int get_server_finished(SSL *s) 916{ 917 unsigned char *buf; 918 unsigned char *p; 919 int i, n, len; 920 921 buf = (unsigned char *)s->init_buf->data; 922 p = buf; 923 if (s->state == SSL2_ST_GET_SERVER_FINISHED_A) { 924 i = ssl2_read(s, (char *)&(buf[s->init_num]), 1 - s->init_num); 925 if (i < (1 - s->init_num)) 926 return (ssl2_part_read(s, SSL_F_GET_SERVER_FINISHED, i)); 927 s->init_num += i; 928 929 if (*p == SSL2_MT_REQUEST_CERTIFICATE) { 930 s->state = SSL2_ST_SEND_CLIENT_CERTIFICATE_A; 931 return (1); 932 } else if (*p != SSL2_MT_SERVER_FINISHED) { 933 if (p[0] != SSL2_MT_ERROR) { 934 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 935 SSLerr(SSL_F_GET_SERVER_FINISHED, 936 SSL_R_READ_WRONG_PACKET_TYPE); 937 } else { 938 SSLerr(SSL_F_GET_SERVER_FINISHED, SSL_R_PEER_ERROR); 939 /* try to read the error message */ 940 i = ssl2_read(s, (char *)&(p[s->init_num]), 3 - s->init_num); 941 return ssl2_part_read(s, SSL_F_GET_SERVER_VERIFY, i); 942 } 943 return (-1); 944 } 945 s->state = SSL2_ST_GET_SERVER_FINISHED_B; 946 } 947 948 len = 1 + SSL2_SSL_SESSION_ID_LENGTH; 949 n = len - s->init_num; 950 i = ssl2_read(s, (char *)&(buf[s->init_num]), n); 951 if (i < n) { 952 /* 953 * XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, 954 * that's the maximum 955 */ 956 return (ssl2_part_read(s, SSL_F_GET_SERVER_FINISHED, i)); 957 } 958 s->init_num += i; 959 if (s->msg_callback) { 960 /* SERVER-FINISHED */ 961 s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, 962 s->msg_callback_arg); 963 } 964 965 if (!s->hit) { /* new session */ 966 /* new session-id */ 967 /* 968 * Make sure we were not trying to re-use an old SSL_SESSION or bad 969 * things can happen 970 */ 971 /* ZZZZZZZZZZZZZ */ 972 s->session->session_id_length = SSL2_SSL_SESSION_ID_LENGTH; 973 memcpy(s->session->session_id, p + 1, SSL2_SSL_SESSION_ID_LENGTH); 974 } else { 975 if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG)) { 976 if ((s->session->session_id_length > 977 sizeof s->session->session_id) 978 || (0 != 979 memcmp(buf + 1, s->session->session_id, 980 (unsigned int)s->session->session_id_length))) { 981 ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR); 982 SSLerr(SSL_F_GET_SERVER_FINISHED, 983 SSL_R_SSL_SESSION_ID_IS_DIFFERENT); 984 return (-1); 985 } 986 } 987 } 988 s->state = SSL_ST_OK; 989 return (1); 990} 991 992/* loads in the certificate from the server */ 993int ssl2_set_certificate(SSL *s, int type, int len, const unsigned char *data) 994{ 995 STACK_OF(X509) *sk = NULL; 996 EVP_PKEY *pkey = NULL; 997 SESS_CERT *sc = NULL; 998 int i; 999 X509 *x509 = NULL; 1000 int ret = 0; 1001 1002 x509 = d2i_X509(NULL, &data, (long)len); 1003 if (x509 == NULL) { 1004 SSLerr(SSL_F_SSL2_SET_CERTIFICATE, ERR_R_X509_LIB); 1005 goto err; 1006 } 1007 1008 if ((sk = sk_X509_new_null()) == NULL || !sk_X509_push(sk, x509)) { 1009 SSLerr(SSL_F_SSL2_SET_CERTIFICATE, ERR_R_MALLOC_FAILURE); 1010 goto err; 1011 } 1012 1013 i = ssl_verify_cert_chain(s, sk); 1014 1015 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1016 SSLerr(SSL_F_SSL2_SET_CERTIFICATE, SSL_R_CERTIFICATE_VERIFY_FAILED); 1017 goto err; 1018 } 1019 ERR_clear_error(); /* but we keep s->verify_result */ 1020 s->session->verify_result = s->verify_result; 1021 1022 /* server's cert for this session */ 1023 sc = ssl_sess_cert_new(); 1024 if (sc == NULL) { 1025 ret = -1; 1026 goto err; 1027 } 1028 if (s->session->sess_cert) 1029 ssl_sess_cert_free(s->session->sess_cert); 1030 s->session->sess_cert = sc; 1031 1032 sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509 = x509; 1033 sc->peer_key = &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]); 1034 1035 pkey = X509_get_pubkey(x509); 1036 x509 = NULL; 1037 if (pkey == NULL) { 1038 SSLerr(SSL_F_SSL2_SET_CERTIFICATE, 1039 SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY); 1040 goto err; 1041 } 1042 if (pkey->type != EVP_PKEY_RSA) { 1043 SSLerr(SSL_F_SSL2_SET_CERTIFICATE, SSL_R_PUBLIC_KEY_NOT_RSA); 1044 goto err; 1045 } 1046 1047 if (!ssl_set_peer_cert_type(sc, SSL2_CT_X509_CERTIFICATE)) 1048 goto err; 1049 ret = 1; 1050 err: 1051 sk_X509_free(sk); 1052 X509_free(x509); 1053 EVP_PKEY_free(pkey); 1054 return (ret); 1055} 1056 1057static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from, 1058 unsigned char *to, int padding) 1059{ 1060 EVP_PKEY *pkey = NULL; 1061 int i = -1; 1062 1063 if ((sc == NULL) || (sc->peer_key->x509 == NULL) || 1064 ((pkey = X509_get_pubkey(sc->peer_key->x509)) == NULL)) { 1065 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT, SSL_R_NO_PUBLICKEY); 1066 return (-1); 1067 } 1068 if (pkey->type != EVP_PKEY_RSA) { 1069 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT, SSL_R_PUBLIC_KEY_IS_NOT_RSA); 1070 goto end; 1071 } 1072 1073 /* we have the public key */ 1074 i = RSA_public_encrypt(len, from, to, pkey->pkey.rsa, padding); 1075 if (i < 0) 1076 SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT, ERR_R_RSA_LIB); 1077 end: 1078 EVP_PKEY_free(pkey); 1079 return (i); 1080} 1081#else /* !OPENSSL_NO_SSL2 */ 1082 1083# if PEDANTIC 1084static void *dummy = &dummy; 1085# endif 1086 1087#endif 1088