s3_clnt.c revision 298999
1/* ssl/s3_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) 1998-2007 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 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124/* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151#include <stdio.h> 152#include "ssl_locl.h" 153#include "kssl_lcl.h" 154#include <openssl/buffer.h> 155#include <openssl/rand.h> 156#include <openssl/objects.h> 157#include <openssl/evp.h> 158#include <openssl/md5.h> 159#ifdef OPENSSL_FIPS 160# include <openssl/fips.h> 161#endif 162#ifndef OPENSSL_NO_DH 163# include <openssl/dh.h> 164#endif 165#include <openssl/bn.h> 166#ifndef OPENSSL_NO_ENGINE 167# include <openssl/engine.h> 168#endif 169 170static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b); 171#ifndef OPENSSL_NO_TLSEXT 172static int ssl3_check_finished(SSL *s); 173#endif 174 175#ifndef OPENSSL_NO_SSL3_METHOD 176static const SSL_METHOD *ssl3_get_client_method(int ver) 177{ 178 if (ver == SSL3_VERSION) 179 return (SSLv3_client_method()); 180 else 181 return (NULL); 182} 183 184IMPLEMENT_ssl3_meth_func(SSLv3_client_method, 185 ssl_undefined_function, 186 ssl3_connect, ssl3_get_client_method) 187#endif 188int ssl3_connect(SSL *s) 189{ 190 BUF_MEM *buf = NULL; 191 unsigned long Time = (unsigned long)time(NULL); 192 void (*cb) (const SSL *ssl, int type, int val) = NULL; 193 int ret = -1; 194 int new_state, state, skip = 0; 195 196 RAND_add(&Time, sizeof(Time), 0); 197 ERR_clear_error(); 198 clear_sys_error(); 199 200 if (s->info_callback != NULL) 201 cb = s->info_callback; 202 else if (s->ctx->info_callback != NULL) 203 cb = s->ctx->info_callback; 204 205 s->in_handshake++; 206 if (!SSL_in_init(s) || SSL_in_before(s)) 207 SSL_clear(s); 208 209#ifndef OPENSSL_NO_HEARTBEATS 210 /* 211 * If we're awaiting a HeartbeatResponse, pretend we already got and 212 * don't await it anymore, because Heartbeats don't make sense during 213 * handshakes anyway. 214 */ 215 if (s->tlsext_hb_pending) { 216 s->tlsext_hb_pending = 0; 217 s->tlsext_hb_seq++; 218 } 219#endif 220 221 for (;;) { 222 state = s->state; 223 224 switch (s->state) { 225 case SSL_ST_RENEGOTIATE: 226 s->renegotiate = 1; 227 s->state = SSL_ST_CONNECT; 228 s->ctx->stats.sess_connect_renegotiate++; 229 /* break */ 230 case SSL_ST_BEFORE: 231 case SSL_ST_CONNECT: 232 case SSL_ST_BEFORE | SSL_ST_CONNECT: 233 case SSL_ST_OK | SSL_ST_CONNECT: 234 235 s->server = 0; 236 if (cb != NULL) 237 cb(s, SSL_CB_HANDSHAKE_START, 1); 238 239 if ((s->version & 0xff00) != 0x0300) { 240 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR); 241 s->state = SSL_ST_ERR; 242 ret = -1; 243 goto end; 244 } 245 246 /* s->version=SSL3_VERSION; */ 247 s->type = SSL_ST_CONNECT; 248 249 if (s->init_buf == NULL) { 250 if ((buf = BUF_MEM_new()) == NULL) { 251 ret = -1; 252 s->state = SSL_ST_ERR; 253 goto end; 254 } 255 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 256 ret = -1; 257 s->state = SSL_ST_ERR; 258 goto end; 259 } 260 s->init_buf = buf; 261 buf = NULL; 262 } 263 264 if (!ssl3_setup_buffers(s)) { 265 ret = -1; 266 goto end; 267 } 268 269 /* setup buffing BIO */ 270 if (!ssl_init_wbio_buffer(s, 0)) { 271 ret = -1; 272 s->state = SSL_ST_ERR; 273 goto end; 274 } 275 276 /* don't push the buffering BIO quite yet */ 277 278 ssl3_init_finished_mac(s); 279 280 s->state = SSL3_ST_CW_CLNT_HELLO_A; 281 s->ctx->stats.sess_connect++; 282 s->init_num = 0; 283 s->s3->flags &= ~SSL3_FLAGS_CCS_OK; 284 /* 285 * Should have been reset by ssl3_get_finished, too. 286 */ 287 s->s3->change_cipher_spec = 0; 288 break; 289 290 case SSL3_ST_CW_CLNT_HELLO_A: 291 case SSL3_ST_CW_CLNT_HELLO_B: 292 293 s->shutdown = 0; 294 ret = ssl3_client_hello(s); 295 if (ret <= 0) 296 goto end; 297 s->state = SSL3_ST_CR_SRVR_HELLO_A; 298 s->init_num = 0; 299 300 /* turn on buffering for the next lot of output */ 301 if (s->bbio != s->wbio) 302 s->wbio = BIO_push(s->bbio, s->wbio); 303 304 break; 305 306 case SSL3_ST_CR_SRVR_HELLO_A: 307 case SSL3_ST_CR_SRVR_HELLO_B: 308 ret = ssl3_get_server_hello(s); 309 if (ret <= 0) 310 goto end; 311 312 if (s->hit) { 313 s->state = SSL3_ST_CR_FINISHED_A; 314#ifndef OPENSSL_NO_TLSEXT 315 if (s->tlsext_ticket_expected) { 316 /* receive renewed session ticket */ 317 s->state = SSL3_ST_CR_SESSION_TICKET_A; 318 } 319#endif 320 } else 321 s->state = SSL3_ST_CR_CERT_A; 322 s->init_num = 0; 323 break; 324 325 case SSL3_ST_CR_CERT_A: 326 case SSL3_ST_CR_CERT_B: 327#ifndef OPENSSL_NO_TLSEXT 328 /* Noop (ret = 0) for everything but EAP-FAST. */ 329 ret = ssl3_check_finished(s); 330 if (ret < 0) 331 goto end; 332 if (ret == 1) { 333 s->hit = 1; 334 s->state = SSL3_ST_CR_FINISHED_A; 335 s->init_num = 0; 336 break; 337 } 338#endif 339 /* Check if it is anon DH/ECDH, SRP auth */ 340 /* or PSK */ 341 if (! 342 (s->s3->tmp. 343 new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP)) 344 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 345 ret = ssl3_get_server_certificate(s); 346 if (ret <= 0) 347 goto end; 348#ifndef OPENSSL_NO_TLSEXT 349 if (s->tlsext_status_expected) 350 s->state = SSL3_ST_CR_CERT_STATUS_A; 351 else 352 s->state = SSL3_ST_CR_KEY_EXCH_A; 353 } else { 354 skip = 1; 355 s->state = SSL3_ST_CR_KEY_EXCH_A; 356 } 357#else 358 } else 359 skip = 1; 360 361 s->state = SSL3_ST_CR_KEY_EXCH_A; 362#endif 363 s->init_num = 0; 364 break; 365 366 case SSL3_ST_CR_KEY_EXCH_A: 367 case SSL3_ST_CR_KEY_EXCH_B: 368 ret = ssl3_get_key_exchange(s); 369 if (ret <= 0) 370 goto end; 371 s->state = SSL3_ST_CR_CERT_REQ_A; 372 s->init_num = 0; 373 374 /* 375 * at this point we check that we have the required stuff from 376 * the server 377 */ 378 if (!ssl3_check_cert_and_algorithm(s)) { 379 ret = -1; 380 s->state = SSL_ST_ERR; 381 goto end; 382 } 383 break; 384 385 case SSL3_ST_CR_CERT_REQ_A: 386 case SSL3_ST_CR_CERT_REQ_B: 387 ret = ssl3_get_certificate_request(s); 388 if (ret <= 0) 389 goto end; 390 s->state = SSL3_ST_CR_SRVR_DONE_A; 391 s->init_num = 0; 392 break; 393 394 case SSL3_ST_CR_SRVR_DONE_A: 395 case SSL3_ST_CR_SRVR_DONE_B: 396 ret = ssl3_get_server_done(s); 397 if (ret <= 0) 398 goto end; 399#ifndef OPENSSL_NO_SRP 400 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) { 401 if ((ret = SRP_Calc_A_param(s)) <= 0) { 402 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_SRP_A_CALC); 403 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 404 s->state = SSL_ST_ERR; 405 goto end; 406 } 407 } 408#endif 409 if (s->s3->tmp.cert_req) 410 s->state = SSL3_ST_CW_CERT_A; 411 else 412 s->state = SSL3_ST_CW_KEY_EXCH_A; 413 s->init_num = 0; 414 415 break; 416 417 case SSL3_ST_CW_CERT_A: 418 case SSL3_ST_CW_CERT_B: 419 case SSL3_ST_CW_CERT_C: 420 case SSL3_ST_CW_CERT_D: 421 ret = ssl3_send_client_certificate(s); 422 if (ret <= 0) 423 goto end; 424 s->state = SSL3_ST_CW_KEY_EXCH_A; 425 s->init_num = 0; 426 break; 427 428 case SSL3_ST_CW_KEY_EXCH_A: 429 case SSL3_ST_CW_KEY_EXCH_B: 430 ret = ssl3_send_client_key_exchange(s); 431 if (ret <= 0) 432 goto end; 433 /* 434 * EAY EAY EAY need to check for DH fix cert sent back 435 */ 436 /* 437 * For TLS, cert_req is set to 2, so a cert chain of nothing is 438 * sent, but no verify packet is sent 439 */ 440 /* 441 * XXX: For now, we do not support client authentication in ECDH 442 * cipher suites with ECDH (rather than ECDSA) certificates. We 443 * need to skip the certificate verify message when client's 444 * ECDH public key is sent inside the client certificate. 445 */ 446 if (s->s3->tmp.cert_req == 1) { 447 s->state = SSL3_ST_CW_CERT_VRFY_A; 448 } else { 449 s->state = SSL3_ST_CW_CHANGE_A; 450 } 451 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 452 s->state = SSL3_ST_CW_CHANGE_A; 453 } 454 455 s->init_num = 0; 456 break; 457 458 case SSL3_ST_CW_CERT_VRFY_A: 459 case SSL3_ST_CW_CERT_VRFY_B: 460 ret = ssl3_send_client_verify(s); 461 if (ret <= 0) 462 goto end; 463 s->state = SSL3_ST_CW_CHANGE_A; 464 s->init_num = 0; 465 break; 466 467 case SSL3_ST_CW_CHANGE_A: 468 case SSL3_ST_CW_CHANGE_B: 469 ret = ssl3_send_change_cipher_spec(s, 470 SSL3_ST_CW_CHANGE_A, 471 SSL3_ST_CW_CHANGE_B); 472 if (ret <= 0) 473 goto end; 474 475#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG) 476 s->state = SSL3_ST_CW_FINISHED_A; 477#else 478 if (s->s3->next_proto_neg_seen) 479 s->state = SSL3_ST_CW_NEXT_PROTO_A; 480 else 481 s->state = SSL3_ST_CW_FINISHED_A; 482#endif 483 s->init_num = 0; 484 485 s->session->cipher = s->s3->tmp.new_cipher; 486#ifdef OPENSSL_NO_COMP 487 s->session->compress_meth = 0; 488#else 489 if (s->s3->tmp.new_compression == NULL) 490 s->session->compress_meth = 0; 491 else 492 s->session->compress_meth = s->s3->tmp.new_compression->id; 493#endif 494 if (!s->method->ssl3_enc->setup_key_block(s)) { 495 ret = -1; 496 s->state = SSL_ST_ERR; 497 goto end; 498 } 499 500 if (!s->method->ssl3_enc->change_cipher_state(s, 501 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) 502 { 503 ret = -1; 504 s->state = SSL_ST_ERR; 505 goto end; 506 } 507 508 break; 509 510#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG) 511 case SSL3_ST_CW_NEXT_PROTO_A: 512 case SSL3_ST_CW_NEXT_PROTO_B: 513 ret = ssl3_send_next_proto(s); 514 if (ret <= 0) 515 goto end; 516 s->state = SSL3_ST_CW_FINISHED_A; 517 break; 518#endif 519 520 case SSL3_ST_CW_FINISHED_A: 521 case SSL3_ST_CW_FINISHED_B: 522 ret = ssl3_send_finished(s, 523 SSL3_ST_CW_FINISHED_A, 524 SSL3_ST_CW_FINISHED_B, 525 s->method-> 526 ssl3_enc->client_finished_label, 527 s->method-> 528 ssl3_enc->client_finished_label_len); 529 if (ret <= 0) 530 goto end; 531 s->state = SSL3_ST_CW_FLUSH; 532 533 /* clear flags */ 534 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER; 535 if (s->hit) { 536 s->s3->tmp.next_state = SSL_ST_OK; 537 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) { 538 s->state = SSL_ST_OK; 539 s->s3->flags |= SSL3_FLAGS_POP_BUFFER; 540 s->s3->delay_buf_pop_ret = 0; 541 } 542 } else { 543#ifndef OPENSSL_NO_TLSEXT 544 /* 545 * Allow NewSessionTicket if ticket expected 546 */ 547 if (s->tlsext_ticket_expected) 548 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A; 549 else 550#endif 551 552 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A; 553 } 554 s->init_num = 0; 555 break; 556 557#ifndef OPENSSL_NO_TLSEXT 558 case SSL3_ST_CR_SESSION_TICKET_A: 559 case SSL3_ST_CR_SESSION_TICKET_B: 560 ret = ssl3_get_new_session_ticket(s); 561 if (ret <= 0) 562 goto end; 563 s->state = SSL3_ST_CR_FINISHED_A; 564 s->init_num = 0; 565 break; 566 567 case SSL3_ST_CR_CERT_STATUS_A: 568 case SSL3_ST_CR_CERT_STATUS_B: 569 ret = ssl3_get_cert_status(s); 570 if (ret <= 0) 571 goto end; 572 s->state = SSL3_ST_CR_KEY_EXCH_A; 573 s->init_num = 0; 574 break; 575#endif 576 577 case SSL3_ST_CR_FINISHED_A: 578 case SSL3_ST_CR_FINISHED_B: 579 if (!s->s3->change_cipher_spec) 580 s->s3->flags |= SSL3_FLAGS_CCS_OK; 581 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 582 SSL3_ST_CR_FINISHED_B); 583 if (ret <= 0) 584 goto end; 585 586 if (s->hit) 587 s->state = SSL3_ST_CW_CHANGE_A; 588 else 589 s->state = SSL_ST_OK; 590 s->init_num = 0; 591 break; 592 593 case SSL3_ST_CW_FLUSH: 594 s->rwstate = SSL_WRITING; 595 if (BIO_flush(s->wbio) <= 0) { 596 ret = -1; 597 goto end; 598 } 599 s->rwstate = SSL_NOTHING; 600 s->state = s->s3->tmp.next_state; 601 break; 602 603 case SSL_ST_OK: 604 /* clean a few things up */ 605 ssl3_cleanup_key_block(s); 606 607 if (s->init_buf != NULL) { 608 BUF_MEM_free(s->init_buf); 609 s->init_buf = NULL; 610 } 611 612 /* 613 * If we are not 'joining' the last two packets, remove the 614 * buffering now 615 */ 616 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER)) 617 ssl_free_wbio_buffer(s); 618 /* else do it later in ssl3_write */ 619 620 s->init_num = 0; 621 s->renegotiate = 0; 622 s->new_session = 0; 623 624 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 625 if (s->hit) 626 s->ctx->stats.sess_hit++; 627 628 ret = 1; 629 /* s->server=0; */ 630 s->handshake_func = ssl3_connect; 631 s->ctx->stats.sess_connect_good++; 632 633 if (cb != NULL) 634 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 635 636 goto end; 637 /* break; */ 638 639 case SSL_ST_ERR: 640 default: 641 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_UNKNOWN_STATE); 642 ret = -1; 643 goto end; 644 /* break; */ 645 } 646 647 /* did we do anything */ 648 if (!s->s3->tmp.reuse_message && !skip) { 649 if (s->debug) { 650 if ((ret = BIO_flush(s->wbio)) <= 0) 651 goto end; 652 } 653 654 if ((cb != NULL) && (s->state != state)) { 655 new_state = s->state; 656 s->state = state; 657 cb(s, SSL_CB_CONNECT_LOOP, 1); 658 s->state = new_state; 659 } 660 } 661 skip = 0; 662 } 663 end: 664 s->in_handshake--; 665 if (buf != NULL) 666 BUF_MEM_free(buf); 667 if (cb != NULL) 668 cb(s, SSL_CB_CONNECT_EXIT, ret); 669 return (ret); 670} 671 672int ssl3_client_hello(SSL *s) 673{ 674 unsigned char *buf; 675 unsigned char *p, *d; 676 int i; 677 unsigned long l; 678#ifndef OPENSSL_NO_COMP 679 int j; 680 SSL_COMP *comp; 681#endif 682 683 buf = (unsigned char *)s->init_buf->data; 684 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) { 685 SSL_SESSION *sess = s->session; 686 if ((sess == NULL) || (sess->ssl_version != s->version) || 687#ifdef OPENSSL_NO_TLSEXT 688 !sess->session_id_length || 689#else 690 /* 691 * In the case of EAP-FAST, we can have a pre-shared 692 * "ticket" without a session ID. 693 */ 694 (!sess->session_id_length && !sess->tlsext_tick) || 695#endif 696 (sess->not_resumable)) { 697 if (!ssl_get_new_session(s, 0)) 698 goto err; 699 } 700 /* else use the pre-loaded session */ 701 702 p = s->s3->client_random; 703 704 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0) 705 goto err; 706 707 /* Do the message type and length last */ 708 d = p = &(buf[4]); 709 710 /*- 711 * version indicates the negotiated version: for example from 712 * an SSLv2/v3 compatible client hello). The client_version 713 * field is the maximum version we permit and it is also 714 * used in RSA encrypted premaster secrets. Some servers can 715 * choke if we initially report a higher version then 716 * renegotiate to a lower one in the premaster secret. This 717 * didn't happen with TLS 1.0 as most servers supported it 718 * but it can with TLS 1.1 or later if the server only supports 719 * 1.0. 720 * 721 * Possible scenario with previous logic: 722 * 1. Client hello indicates TLS 1.2 723 * 2. Server hello says TLS 1.0 724 * 3. RSA encrypted premaster secret uses 1.2. 725 * 4. Handhaked proceeds using TLS 1.0. 726 * 5. Server sends hello request to renegotiate. 727 * 6. Client hello indicates TLS v1.0 as we now 728 * know that is maximum server supports. 729 * 7. Server chokes on RSA encrypted premaster secret 730 * containing version 1.0. 731 * 732 * For interoperability it should be OK to always use the 733 * maximum version we support in client hello and then rely 734 * on the checking of version to ensure the servers isn't 735 * being inconsistent: for example initially negotiating with 736 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 737 * client_version in client hello and not resetting it to 738 * the negotiated version. 739 */ 740#if 0 741 *(p++) = s->version >> 8; 742 *(p++) = s->version & 0xff; 743 s->client_version = s->version; 744#else 745 *(p++) = s->client_version >> 8; 746 *(p++) = s->client_version & 0xff; 747#endif 748 749 /* Random stuff */ 750 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 751 p += SSL3_RANDOM_SIZE; 752 753 /* Session ID */ 754 if (s->new_session) 755 i = 0; 756 else 757 i = s->session->session_id_length; 758 *(p++) = i; 759 if (i != 0) { 760 if (i > (int)sizeof(s->session->session_id)) { 761 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 762 goto err; 763 } 764 memcpy(p, s->session->session_id, i); 765 p += i; 766 } 767 768 /* Ciphers supported */ 769 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0); 770 if (i == 0) { 771 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 772 goto err; 773 } 774#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 775 /* 776 * Some servers hang if client hello > 256 bytes as hack workaround 777 * chop number of supported ciphers to keep it well below this if we 778 * use TLS v1.2 779 */ 780 if (TLS1_get_version(s) >= TLS1_2_VERSION 781 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) 782 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; 783#endif 784 s2n(i, p); 785 p += i; 786 787 /* COMPRESSION */ 788#ifdef OPENSSL_NO_COMP 789 *(p++) = 1; 790#else 791 792 if ((s->options & SSL_OP_NO_COMPRESSION) 793 || !s->ctx->comp_methods) 794 j = 0; 795 else 796 j = sk_SSL_COMP_num(s->ctx->comp_methods); 797 *(p++) = 1 + j; 798 for (i = 0; i < j; i++) { 799 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 800 *(p++) = comp->id; 801 } 802#endif 803 *(p++) = 0; /* Add the NULL method */ 804 805#ifndef OPENSSL_NO_TLSEXT 806 /* TLS extensions */ 807 if (ssl_prepare_clienthello_tlsext(s) <= 0) { 808 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); 809 goto err; 810 } 811 if ((p = 812 ssl_add_clienthello_tlsext(s, p, 813 buf + SSL3_RT_MAX_PLAIN_LENGTH)) == 814 NULL) { 815 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 816 goto err; 817 } 818#endif 819 820 l = (p - d); 821 d = buf; 822 *(d++) = SSL3_MT_CLIENT_HELLO; 823 l2n3(l, d); 824 825 s->state = SSL3_ST_CW_CLNT_HELLO_B; 826 /* number of bytes to write */ 827 s->init_num = p - buf; 828 s->init_off = 0; 829 } 830 831 /* SSL3_ST_CW_CLNT_HELLO_B */ 832 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE)); 833 err: 834 s->state = SSL_ST_ERR; 835 return (-1); 836} 837 838int ssl3_get_server_hello(SSL *s) 839{ 840 STACK_OF(SSL_CIPHER) *sk; 841 const SSL_CIPHER *c; 842 unsigned char *p, *d; 843 int i, al, ok; 844 unsigned int j; 845 long n; 846#ifndef OPENSSL_NO_COMP 847 SSL_COMP *comp; 848#endif 849 850 n = s->method->ssl_get_message(s, 851 SSL3_ST_CR_SRVR_HELLO_A, 852 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok); 853 854 if (!ok) 855 return ((int)n); 856 857 if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER) { 858 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 859 if (s->d1->send_cookie == 0) { 860 s->s3->tmp.reuse_message = 1; 861 return 1; 862 } else { /* already sent a cookie */ 863 864 al = SSL_AD_UNEXPECTED_MESSAGE; 865 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE); 866 goto f_err; 867 } 868 } 869 } 870 871 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) { 872 al = SSL_AD_UNEXPECTED_MESSAGE; 873 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE); 874 goto f_err; 875 } 876 877 d = p = (unsigned char *)s->init_msg; 878 879 if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) { 880 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION); 881 s->version = (s->version & 0xff00) | p[1]; 882 al = SSL_AD_PROTOCOL_VERSION; 883 goto f_err; 884 } 885 p += 2; 886 887 /* load the server hello data */ 888 /* load the server random */ 889 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE); 890 p += SSL3_RANDOM_SIZE; 891 892 s->hit = 0; 893 894 /* get the session-id */ 895 j = *(p++); 896 897 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) { 898 al = SSL_AD_ILLEGAL_PARAMETER; 899 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG); 900 goto f_err; 901 } 902#ifndef OPENSSL_NO_TLSEXT 903 /* 904 * Check if we can resume the session based on external pre-shared secret. 905 * EAP-FAST (RFC 4851) supports two types of session resumption. 906 * Resumption based on server-side state works with session IDs. 907 * Resumption based on pre-shared Protected Access Credentials (PACs) 908 * works by overriding the SessionTicket extension at the application 909 * layer, and does not send a session ID. (We do not know whether EAP-FAST 910 * servers would honour the session ID.) Therefore, the session ID alone 911 * is not a reliable indicator of session resumption, so we first check if 912 * we can resume, and later peek at the next handshake message to see if the 913 * server wants to resume. 914 */ 915 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb && 916 s->session->tlsext_tick) { 917 SSL_CIPHER *pref_cipher = NULL; 918 s->session->master_key_length = sizeof(s->session->master_key); 919 if (s->tls_session_secret_cb(s, s->session->master_key, 920 &s->session->master_key_length, 921 NULL, &pref_cipher, 922 s->tls_session_secret_cb_arg)) { 923 s->session->cipher = pref_cipher ? 924 pref_cipher : ssl_get_cipher_by_char(s, p + j); 925 } else { 926 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 927 al = SSL_AD_INTERNAL_ERROR; 928 goto f_err; 929 } 930 } 931#endif /* OPENSSL_NO_TLSEXT */ 932 933 if (j != 0 && j == s->session->session_id_length 934 && memcmp(p, s->session->session_id, j) == 0) { 935 if (s->sid_ctx_length != s->session->sid_ctx_length 936 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) { 937 /* actually a client application bug */ 938 al = SSL_AD_ILLEGAL_PARAMETER; 939 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 940 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 941 goto f_err; 942 } 943 s->hit = 1; 944 } else { 945 /* 946 * If we were trying for session-id reuse but the server 947 * didn't echo the ID, make a new SSL_SESSION. 948 * In the case of EAP-FAST and PAC, we do not send a session ID, 949 * so the PAC-based session secret is always preserved. It'll be 950 * overwritten if the server refuses resumption. 951 */ 952 if (s->session->session_id_length > 0) { 953 if (!ssl_get_new_session(s, 0)) { 954 al = SSL_AD_INTERNAL_ERROR; 955 goto f_err; 956 } 957 } 958 s->session->session_id_length = j; 959 memcpy(s->session->session_id, p, j); /* j could be 0 */ 960 } 961 p += j; 962 c = ssl_get_cipher_by_char(s, p); 963 if (c == NULL) { 964 /* unknown cipher */ 965 al = SSL_AD_ILLEGAL_PARAMETER; 966 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED); 967 goto f_err; 968 } 969 /* TLS v1.2 only ciphersuites require v1.2 or later */ 970 if ((c->algorithm_ssl & SSL_TLSV1_2) && 971 (TLS1_get_version(s) < TLS1_2_VERSION)) { 972 al = SSL_AD_ILLEGAL_PARAMETER; 973 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED); 974 goto f_err; 975 } 976#ifndef OPENSSL_NO_SRP 977 if (((c->algorithm_mkey & SSL_kSRP) || (c->algorithm_auth & SSL_aSRP)) && 978 !(s->srp_ctx.srp_Mask & SSL_kSRP)) { 979 al = SSL_AD_ILLEGAL_PARAMETER; 980 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED); 981 goto f_err; 982 } 983#endif /* OPENSSL_NO_SRP */ 984 p += ssl_put_cipher_by_char(s, NULL, NULL); 985 986 sk = ssl_get_ciphers_by_id(s); 987 i = sk_SSL_CIPHER_find(sk, c); 988 if (i < 0) { 989 /* we did not say we would use this cipher */ 990 al = SSL_AD_ILLEGAL_PARAMETER; 991 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED); 992 goto f_err; 993 } 994 995 /* 996 * Depending on the session caching (internal/external), the cipher 997 * and/or cipher_id values may not be set. Make sure that cipher_id is 998 * set and use it for comparison. 999 */ 1000 if (s->session->cipher) 1001 s->session->cipher_id = s->session->cipher->id; 1002 if (s->hit && (s->session->cipher_id != c->id)) { 1003/* Workaround is now obsolete */ 1004#if 0 1005 if (!(s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG)) 1006#endif 1007 { 1008 al = SSL_AD_ILLEGAL_PARAMETER; 1009 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 1010 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1011 goto f_err; 1012 } 1013 } 1014 s->s3->tmp.new_cipher = c; 1015 /* 1016 * Don't digest cached records if TLS v1.2: we may need them for client 1017 * authentication. 1018 */ 1019 if (TLS1_get_version(s) < TLS1_2_VERSION 1020 && !ssl3_digest_cached_records(s)) { 1021 al = SSL_AD_INTERNAL_ERROR; 1022 goto f_err; 1023 } 1024 /* lets get the compression algorithm */ 1025 /* COMPRESSION */ 1026#ifdef OPENSSL_NO_COMP 1027 if (*(p++) != 0) { 1028 al = SSL_AD_ILLEGAL_PARAMETER; 1029 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 1030 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1031 goto f_err; 1032 } 1033 /* 1034 * If compression is disabled we'd better not try to resume a session 1035 * using compression. 1036 */ 1037 if (s->session->compress_meth != 0) { 1038 al = SSL_AD_INTERNAL_ERROR; 1039 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION); 1040 goto f_err; 1041 } 1042#else 1043 j = *(p++); 1044 if (s->hit && j != s->session->compress_meth) { 1045 al = SSL_AD_ILLEGAL_PARAMETER; 1046 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 1047 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED); 1048 goto f_err; 1049 } 1050 if (j == 0) 1051 comp = NULL; 1052 else if (s->options & SSL_OP_NO_COMPRESSION) { 1053 al = SSL_AD_ILLEGAL_PARAMETER; 1054 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED); 1055 goto f_err; 1056 } else 1057 comp = ssl3_comp_find(s->ctx->comp_methods, j); 1058 1059 if ((j != 0) && (comp == NULL)) { 1060 al = SSL_AD_ILLEGAL_PARAMETER; 1061 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 1062 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1063 goto f_err; 1064 } else { 1065 s->s3->tmp.new_compression = comp; 1066 } 1067#endif 1068 1069#ifndef OPENSSL_NO_TLSEXT 1070 /* TLS extensions */ 1071 if (s->version >= SSL3_VERSION) { 1072 if (!ssl_parse_serverhello_tlsext(s, &p, d, n, &al)) { 1073 /* 'al' set by ssl_parse_serverhello_tlsext */ 1074 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT); 1075 goto f_err; 1076 } 1077 if (ssl_check_serverhello_tlsext(s) <= 0) { 1078 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT); 1079 goto err; 1080 } 1081 } 1082#endif 1083 1084 if (p != (d + n)) { 1085 /* wrong packet length */ 1086 al = SSL_AD_DECODE_ERROR; 1087 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH); 1088 goto f_err; 1089 } 1090 1091 return (1); 1092 f_err: 1093 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1094 err: 1095 s->state = SSL_ST_ERR; 1096 return (-1); 1097} 1098 1099int ssl3_get_server_certificate(SSL *s) 1100{ 1101 int al, i, ok, ret = -1; 1102 unsigned long n, nc, llen, l; 1103 X509 *x = NULL; 1104 const unsigned char *q, *p; 1105 unsigned char *d; 1106 STACK_OF(X509) *sk = NULL; 1107 SESS_CERT *sc; 1108 EVP_PKEY *pkey = NULL; 1109 int need_cert = 1; /* VRS: 0=> will allow null cert if auth == 1110 * KRB5 */ 1111 1112 n = s->method->ssl_get_message(s, 1113 SSL3_ST_CR_CERT_A, 1114 SSL3_ST_CR_CERT_B, 1115 -1, s->max_cert_list, &ok); 1116 1117 if (!ok) 1118 return ((int)n); 1119 1120 if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) || 1121 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 1122 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE))) { 1123 s->s3->tmp.reuse_message = 1; 1124 return (1); 1125 } 1126 1127 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) { 1128 al = SSL_AD_UNEXPECTED_MESSAGE; 1129 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE); 1130 goto f_err; 1131 } 1132 p = d = (unsigned char *)s->init_msg; 1133 1134 if ((sk = sk_X509_new_null()) == NULL) { 1135 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE); 1136 goto err; 1137 } 1138 1139 n2l3(p, llen); 1140 if (llen + 3 != n) { 1141 al = SSL_AD_DECODE_ERROR; 1142 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH); 1143 goto f_err; 1144 } 1145 for (nc = 0; nc < llen;) { 1146 n2l3(p, l); 1147 if ((l + nc + 3) > llen) { 1148 al = SSL_AD_DECODE_ERROR; 1149 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1150 SSL_R_CERT_LENGTH_MISMATCH); 1151 goto f_err; 1152 } 1153 1154 q = p; 1155 x = d2i_X509(NULL, &q, l); 1156 if (x == NULL) { 1157 al = SSL_AD_BAD_CERTIFICATE; 1158 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB); 1159 goto f_err; 1160 } 1161 if (q != (p + l)) { 1162 al = SSL_AD_DECODE_ERROR; 1163 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1164 SSL_R_CERT_LENGTH_MISMATCH); 1165 goto f_err; 1166 } 1167 if (!sk_X509_push(sk, x)) { 1168 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE); 1169 goto err; 1170 } 1171 x = NULL; 1172 nc += l + 3; 1173 p = q; 1174 } 1175 1176 i = ssl_verify_cert_chain(s, sk); 1177 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0) 1178#ifndef OPENSSL_NO_KRB5 1179 && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) && 1180 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)) 1181#endif /* OPENSSL_NO_KRB5 */ 1182 ) { 1183 al = ssl_verify_alarm_type(s->verify_result); 1184 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1185 SSL_R_CERTIFICATE_VERIFY_FAILED); 1186 goto f_err; 1187 } 1188 ERR_clear_error(); /* but we keep s->verify_result */ 1189 1190 sc = ssl_sess_cert_new(); 1191 if (sc == NULL) 1192 goto err; 1193 1194 if (s->session->sess_cert) 1195 ssl_sess_cert_free(s->session->sess_cert); 1196 s->session->sess_cert = sc; 1197 1198 sc->cert_chain = sk; 1199 /* 1200 * Inconsistency alert: cert_chain does include the peer's certificate, 1201 * which we don't include in s3_srvr.c 1202 */ 1203 x = sk_X509_value(sk, 0); 1204 sk = NULL; 1205 /* 1206 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end 1207 */ 1208 1209 pkey = X509_get_pubkey(x); 1210 1211 /* VRS: allow null cert if auth == KRB5 */ 1212 need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) && 1213 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)) 1214 ? 0 : 1; 1215 1216#ifdef KSSL_DEBUG 1217 fprintf(stderr, "pkey,x = %p, %p\n", pkey, x); 1218 fprintf(stderr, "ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x, pkey)); 1219 fprintf(stderr, "cipher, alg, nc = %s, %lx, %lx, %d\n", 1220 s->s3->tmp.new_cipher->name, 1221 s->s3->tmp.new_cipher->algorithm_mkey, 1222 s->s3->tmp.new_cipher->algorithm_auth, need_cert); 1223#endif /* KSSL_DEBUG */ 1224 1225 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))) { 1226 x = NULL; 1227 al = SSL3_AL_FATAL; 1228 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1229 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1230 goto f_err; 1231 } 1232 1233 i = ssl_cert_type(x, pkey); 1234 if (need_cert && i < 0) { 1235 x = NULL; 1236 al = SSL3_AL_FATAL; 1237 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1238 SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1239 goto f_err; 1240 } 1241 1242 if (need_cert) { 1243 sc->peer_cert_type = i; 1244 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1245 /* 1246 * Why would the following ever happen? We just created sc a couple 1247 * of lines ago. 1248 */ 1249 if (sc->peer_pkeys[i].x509 != NULL) 1250 X509_free(sc->peer_pkeys[i].x509); 1251 sc->peer_pkeys[i].x509 = x; 1252 sc->peer_key = &(sc->peer_pkeys[i]); 1253 1254 if (s->session->peer != NULL) 1255 X509_free(s->session->peer); 1256 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1257 s->session->peer = x; 1258 } else { 1259 sc->peer_cert_type = i; 1260 sc->peer_key = NULL; 1261 1262 if (s->session->peer != NULL) 1263 X509_free(s->session->peer); 1264 s->session->peer = NULL; 1265 } 1266 s->session->verify_result = s->verify_result; 1267 1268 x = NULL; 1269 ret = 1; 1270 1271 if (0) { 1272 f_err: 1273 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1274 err: 1275 s->state = SSL_ST_ERR; 1276 } 1277 1278 EVP_PKEY_free(pkey); 1279 X509_free(x); 1280 sk_X509_pop_free(sk, X509_free); 1281 return (ret); 1282} 1283 1284int ssl3_get_key_exchange(SSL *s) 1285{ 1286#ifndef OPENSSL_NO_RSA 1287 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2]; 1288#endif 1289 EVP_MD_CTX md_ctx; 1290 unsigned char *param, *p; 1291 int al, j, ok; 1292 long i, param_len, n, alg_k, alg_a; 1293 EVP_PKEY *pkey = NULL; 1294 const EVP_MD *md = NULL; 1295#ifndef OPENSSL_NO_RSA 1296 RSA *rsa = NULL; 1297#endif 1298#ifndef OPENSSL_NO_DH 1299 DH *dh = NULL; 1300#endif 1301#ifndef OPENSSL_NO_ECDH 1302 EC_KEY *ecdh = NULL; 1303 BN_CTX *bn_ctx = NULL; 1304 EC_POINT *srvr_ecpoint = NULL; 1305 int curve_nid = 0; 1306 int encoded_pt_len = 0; 1307#endif 1308 1309 EVP_MD_CTX_init(&md_ctx); 1310 1311 /* 1312 * use same message size as in ssl3_get_certificate_request() as 1313 * ServerKeyExchange message may be skipped 1314 */ 1315 n = s->method->ssl_get_message(s, 1316 SSL3_ST_CR_KEY_EXCH_A, 1317 SSL3_ST_CR_KEY_EXCH_B, 1318 -1, s->max_cert_list, &ok); 1319 if (!ok) 1320 return ((int)n); 1321 1322 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1323 1324 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1325 /* 1326 * Can't skip server key exchange if this is an ephemeral 1327 * ciphersuite. 1328 */ 1329 if (alg_k & (SSL_kEDH | SSL_kEECDH)) { 1330 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); 1331 al = SSL_AD_UNEXPECTED_MESSAGE; 1332 goto f_err; 1333 } 1334#ifndef OPENSSL_NO_PSK 1335 /* 1336 * In plain PSK ciphersuite, ServerKeyExchange can be omitted if no 1337 * identity hint is sent. Set session->sess_cert anyway to avoid 1338 * problems later. 1339 */ 1340 if (alg_k & SSL_kPSK) { 1341 s->session->sess_cert = ssl_sess_cert_new(); 1342 if (s->ctx->psk_identity_hint) 1343 OPENSSL_free(s->ctx->psk_identity_hint); 1344 s->ctx->psk_identity_hint = NULL; 1345 } 1346#endif 1347 s->s3->tmp.reuse_message = 1; 1348 return (1); 1349 } 1350 1351 param = p = (unsigned char *)s->init_msg; 1352 if (s->session->sess_cert != NULL) { 1353#ifndef OPENSSL_NO_RSA 1354 if (s->session->sess_cert->peer_rsa_tmp != NULL) { 1355 RSA_free(s->session->sess_cert->peer_rsa_tmp); 1356 s->session->sess_cert->peer_rsa_tmp = NULL; 1357 } 1358#endif 1359#ifndef OPENSSL_NO_DH 1360 if (s->session->sess_cert->peer_dh_tmp) { 1361 DH_free(s->session->sess_cert->peer_dh_tmp); 1362 s->session->sess_cert->peer_dh_tmp = NULL; 1363 } 1364#endif 1365#ifndef OPENSSL_NO_ECDH 1366 if (s->session->sess_cert->peer_ecdh_tmp) { 1367 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp); 1368 s->session->sess_cert->peer_ecdh_tmp = NULL; 1369 } 1370#endif 1371 } else { 1372 s->session->sess_cert = ssl_sess_cert_new(); 1373 } 1374 1375 /* Total length of the parameters including the length prefix */ 1376 param_len = 0; 1377 1378 alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1379 1380 al = SSL_AD_DECODE_ERROR; 1381 1382#ifndef OPENSSL_NO_PSK 1383 if (alg_k & SSL_kPSK) { 1384 param_len = 2; 1385 if (param_len > n) { 1386 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1387 goto f_err; 1388 } 1389 n2s(p, i); 1390 1391 /* 1392 * Store PSK identity hint for later use, hint is used in 1393 * ssl3_send_client_key_exchange. Assume that the maximum length of 1394 * a PSK identity hint can be as long as the maximum length of a PSK 1395 * identity. 1396 */ 1397 if (i > PSK_MAX_IDENTITY_LEN) { 1398 al = SSL_AD_HANDSHAKE_FAILURE; 1399 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG); 1400 goto f_err; 1401 } 1402 if (i > n - param_len) { 1403 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1404 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH); 1405 goto f_err; 1406 } 1407 param_len += i; 1408 1409 s->session->psk_identity_hint = BUF_strndup((char *)p, i); 1410 if (s->session->psk_identity_hint == NULL) { 1411 al = SSL_AD_HANDSHAKE_FAILURE; 1412 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 1413 goto f_err; 1414 } 1415 1416 p += i; 1417 n -= param_len; 1418 } else 1419#endif /* !OPENSSL_NO_PSK */ 1420#ifndef OPENSSL_NO_SRP 1421 if (alg_k & SSL_kSRP) { 1422 param_len = 2; 1423 if (param_len > n) { 1424 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1425 goto f_err; 1426 } 1427 n2s(p, i); 1428 1429 if (i > n - param_len) { 1430 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH); 1431 goto f_err; 1432 } 1433 param_len += i; 1434 1435 if (!(s->srp_ctx.N = BN_bin2bn(p, i, NULL))) { 1436 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1437 goto err; 1438 } 1439 p += i; 1440 1441 if (2 > n - param_len) { 1442 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1443 goto f_err; 1444 } 1445 param_len += 2; 1446 1447 n2s(p, i); 1448 1449 if (i > n - param_len) { 1450 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH); 1451 goto f_err; 1452 } 1453 param_len += i; 1454 1455 if (!(s->srp_ctx.g = BN_bin2bn(p, i, NULL))) { 1456 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1457 goto err; 1458 } 1459 p += i; 1460 1461 if (1 > n - param_len) { 1462 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1463 goto f_err; 1464 } 1465 param_len += 1; 1466 1467 i = (unsigned int)(p[0]); 1468 p++; 1469 1470 if (i > n - param_len) { 1471 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH); 1472 goto f_err; 1473 } 1474 param_len += i; 1475 1476 if (!(s->srp_ctx.s = BN_bin2bn(p, i, NULL))) { 1477 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1478 goto err; 1479 } 1480 p += i; 1481 1482 if (2 > n - param_len) { 1483 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1484 goto f_err; 1485 } 1486 param_len += 2; 1487 1488 n2s(p, i); 1489 1490 if (i > n - param_len) { 1491 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH); 1492 goto f_err; 1493 } 1494 param_len += i; 1495 1496 if (!(s->srp_ctx.B = BN_bin2bn(p, i, NULL))) { 1497 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1498 goto err; 1499 } 1500 p += i; 1501 n -= param_len; 1502 1503 if (!srp_verify_server_param(s, &al)) { 1504 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS); 1505 goto f_err; 1506 } 1507 1508/* We must check if there is a certificate */ 1509# ifndef OPENSSL_NO_RSA 1510 if (alg_a & SSL_aRSA) 1511 pkey = 1512 X509_get_pubkey(s->session-> 1513 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1514# else 1515 if (0) ; 1516# endif 1517# ifndef OPENSSL_NO_DSA 1518 else if (alg_a & SSL_aDSS) 1519 pkey = 1520 X509_get_pubkey(s->session-> 1521 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN]. 1522 x509); 1523# endif 1524 } else 1525#endif /* !OPENSSL_NO_SRP */ 1526#ifndef OPENSSL_NO_RSA 1527 if (alg_k & SSL_kRSA) { 1528 /* Temporary RSA keys only allowed in export ciphersuites */ 1529 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) { 1530 al = SSL_AD_UNEXPECTED_MESSAGE; 1531 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); 1532 goto f_err; 1533 } 1534 if ((rsa = RSA_new()) == NULL) { 1535 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 1536 goto err; 1537 } 1538 1539 param_len = 2; 1540 if (param_len > n) { 1541 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1542 goto f_err; 1543 } 1544 n2s(p, i); 1545 1546 if (i > n - param_len) { 1547 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH); 1548 goto f_err; 1549 } 1550 param_len += i; 1551 1552 if (!(rsa->n = BN_bin2bn(p, i, rsa->n))) { 1553 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1554 goto err; 1555 } 1556 p += i; 1557 1558 if (2 > n - param_len) { 1559 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1560 goto f_err; 1561 } 1562 param_len += 2; 1563 1564 n2s(p, i); 1565 1566 if (i > n - param_len) { 1567 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH); 1568 goto f_err; 1569 } 1570 param_len += i; 1571 1572 if (!(rsa->e = BN_bin2bn(p, i, rsa->e))) { 1573 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1574 goto err; 1575 } 1576 p += i; 1577 n -= param_len; 1578 1579 /* this should be because we are using an export cipher */ 1580 if (alg_a & SSL_aRSA) 1581 pkey = 1582 X509_get_pubkey(s->session-> 1583 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1584 else { 1585 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1586 goto err; 1587 } 1588 1589 if (EVP_PKEY_bits(pkey) <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 1590 al = SSL_AD_UNEXPECTED_MESSAGE; 1591 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); 1592 goto f_err; 1593 } 1594 1595 s->session->sess_cert->peer_rsa_tmp = rsa; 1596 rsa = NULL; 1597 } 1598#else /* OPENSSL_NO_RSA */ 1599 if (0) ; 1600#endif 1601#ifndef OPENSSL_NO_DH 1602 else if (alg_k & SSL_kEDH) { 1603 if ((dh = DH_new()) == NULL) { 1604 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB); 1605 goto err; 1606 } 1607 1608 param_len = 2; 1609 if (param_len > n) { 1610 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1611 goto f_err; 1612 } 1613 n2s(p, i); 1614 1615 if (i > n - param_len) { 1616 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH); 1617 goto f_err; 1618 } 1619 param_len += i; 1620 1621 if (!(dh->p = BN_bin2bn(p, i, NULL))) { 1622 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1623 goto err; 1624 } 1625 p += i; 1626 1627 if (BN_is_zero(dh->p)) { 1628 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_VALUE); 1629 goto f_err; 1630 } 1631 1632 1633 if (2 > n - param_len) { 1634 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1635 goto f_err; 1636 } 1637 param_len += 2; 1638 1639 n2s(p, i); 1640 1641 if (i > n - param_len) { 1642 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH); 1643 goto f_err; 1644 } 1645 param_len += i; 1646 1647 if (!(dh->g = BN_bin2bn(p, i, NULL))) { 1648 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1649 goto err; 1650 } 1651 p += i; 1652 1653 if (BN_is_zero(dh->g)) { 1654 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_VALUE); 1655 goto f_err; 1656 } 1657 1658 if (2 > n - param_len) { 1659 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1660 goto f_err; 1661 } 1662 param_len += 2; 1663 1664 n2s(p, i); 1665 1666 if (i > n - param_len) { 1667 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH); 1668 goto f_err; 1669 } 1670 param_len += i; 1671 1672 if (!(dh->pub_key = BN_bin2bn(p, i, NULL))) { 1673 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1674 goto err; 1675 } 1676 p += i; 1677 n -= param_len; 1678 1679 if (BN_is_zero(dh->pub_key)) { 1680 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_VALUE); 1681 goto f_err; 1682 } 1683 1684# ifndef OPENSSL_NO_RSA 1685 if (alg_a & SSL_aRSA) 1686 pkey = 1687 X509_get_pubkey(s->session-> 1688 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1689# else 1690 if (0) ; 1691# endif 1692# ifndef OPENSSL_NO_DSA 1693 else if (alg_a & SSL_aDSS) 1694 pkey = 1695 X509_get_pubkey(s->session-> 1696 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN]. 1697 x509); 1698# endif 1699 /* else anonymous DH, so no certificate or pkey. */ 1700 1701 s->session->sess_cert->peer_dh_tmp = dh; 1702 dh = NULL; 1703 } else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd)) { 1704 al = SSL_AD_ILLEGAL_PARAMETER; 1705 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1706 SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER); 1707 goto f_err; 1708 } 1709#endif /* !OPENSSL_NO_DH */ 1710 1711#ifndef OPENSSL_NO_ECDH 1712 else if (alg_k & SSL_kEECDH) { 1713 EC_GROUP *ngroup; 1714 const EC_GROUP *group; 1715 1716 if ((ecdh = EC_KEY_new()) == NULL) { 1717 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 1718 goto err; 1719 } 1720 1721 /* 1722 * Extract elliptic curve parameters and the server's ephemeral ECDH 1723 * public key. Keep accumulating lengths of various components in 1724 * param_len and make sure it never exceeds n. 1725 */ 1726 1727 /* 1728 * XXX: For now we only support named (not generic) curves and the 1729 * ECParameters in this case is just three bytes. We also need one 1730 * byte for the length of the encoded point 1731 */ 1732 param_len = 4; 1733 if (param_len > n) { 1734 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1735 goto f_err; 1736 } 1737 1738 if ((*p != NAMED_CURVE_TYPE) || 1739 ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)) { 1740 al = SSL_AD_INTERNAL_ERROR; 1741 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1742 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1743 goto f_err; 1744 } 1745 1746 ngroup = EC_GROUP_new_by_curve_name(curve_nid); 1747 if (ngroup == NULL) { 1748 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB); 1749 goto err; 1750 } 1751 if (EC_KEY_set_group(ecdh, ngroup) == 0) { 1752 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB); 1753 goto err; 1754 } 1755 EC_GROUP_free(ngroup); 1756 1757 group = EC_KEY_get0_group(ecdh); 1758 1759 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1760 (EC_GROUP_get_degree(group) > 163)) { 1761 al = SSL_AD_EXPORT_RESTRICTION; 1762 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1763 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1764 goto f_err; 1765 } 1766 1767 p += 3; 1768 1769 /* Next, get the encoded ECPoint */ 1770 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) || 1771 ((bn_ctx = BN_CTX_new()) == NULL)) { 1772 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 1773 goto err; 1774 } 1775 1776 encoded_pt_len = *p; /* length of encoded point */ 1777 p += 1; 1778 1779 if ((encoded_pt_len > n - param_len) || 1780 (EC_POINT_oct2point(group, srvr_ecpoint, 1781 p, encoded_pt_len, bn_ctx) == 0)) { 1782 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT); 1783 goto f_err; 1784 } 1785 param_len += encoded_pt_len; 1786 1787 n -= param_len; 1788 p += encoded_pt_len; 1789 1790 /* 1791 * The ECC/TLS specification does not mention the use of DSA to sign 1792 * ECParameters in the server key exchange message. We do support RSA 1793 * and ECDSA. 1794 */ 1795 if (0) ; 1796# ifndef OPENSSL_NO_RSA 1797 else if (alg_a & SSL_aRSA) 1798 pkey = 1799 X509_get_pubkey(s->session-> 1800 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1801# endif 1802# ifndef OPENSSL_NO_ECDSA 1803 else if (alg_a & SSL_aECDSA) 1804 pkey = 1805 X509_get_pubkey(s->session-> 1806 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1807# endif 1808 /* else anonymous ECDH, so no certificate or pkey. */ 1809 EC_KEY_set_public_key(ecdh, srvr_ecpoint); 1810 s->session->sess_cert->peer_ecdh_tmp = ecdh; 1811 ecdh = NULL; 1812 BN_CTX_free(bn_ctx); 1813 bn_ctx = NULL; 1814 EC_POINT_free(srvr_ecpoint); 1815 srvr_ecpoint = NULL; 1816 } else if (alg_k) { 1817 al = SSL_AD_UNEXPECTED_MESSAGE; 1818 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); 1819 goto f_err; 1820 } 1821#endif /* !OPENSSL_NO_ECDH */ 1822 1823 /* p points to the next byte, there are 'n' bytes left */ 1824 1825 /* if it was signed, check the signature */ 1826 if (pkey != NULL) { 1827 if (TLS1_get_version(s) >= TLS1_2_VERSION) { 1828 int sigalg; 1829 if (2 > n) { 1830 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1831 goto f_err; 1832 } 1833 1834 sigalg = tls12_get_sigid(pkey); 1835 /* Should never happen */ 1836 if (sigalg == -1) { 1837 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1838 goto err; 1839 } 1840 /* Check key type is consistent with signature */ 1841 if (sigalg != (int)p[1]) { 1842 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1843 SSL_R_WRONG_SIGNATURE_TYPE); 1844 al = SSL_AD_DECODE_ERROR; 1845 goto f_err; 1846 } 1847 md = tls12_get_hash(p[0]); 1848 if (md == NULL) { 1849 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNKNOWN_DIGEST); 1850 goto f_err; 1851 } 1852#ifdef SSL_DEBUG 1853 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); 1854#endif 1855 p += 2; 1856 n -= 2; 1857 } else 1858 md = EVP_sha1(); 1859 1860 if (2 > n) { 1861 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1862 goto f_err; 1863 } 1864 n2s(p, i); 1865 n -= 2; 1866 j = EVP_PKEY_size(pkey); 1867 1868 /* 1869 * Check signature length. If n is 0 then signature is empty 1870 */ 1871 if ((i != n) || (n > j) || (n <= 0)) { 1872 /* wrong packet length */ 1873 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH); 1874 goto f_err; 1875 } 1876#ifndef OPENSSL_NO_RSA 1877 if (pkey->type == EVP_PKEY_RSA 1878 && TLS1_get_version(s) < TLS1_2_VERSION) { 1879 int num; 1880 unsigned int size; 1881 1882 j = 0; 1883 q = md_buf; 1884 for (num = 2; num > 0; num--) { 1885 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 1886 if (EVP_DigestInit_ex(&md_ctx, 1887 (num == 2) ? s->ctx->md5 : s->ctx->sha1, 1888 NULL) <= 0 1889 || EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]), 1890 SSL3_RANDOM_SIZE) <= 0 1891 || EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]), 1892 SSL3_RANDOM_SIZE) <= 0 1893 || EVP_DigestUpdate(&md_ctx, param, param_len) <= 0 1894 || EVP_DigestFinal_ex(&md_ctx, q, &size) <= 0) { 1895 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1896 ERR_R_INTERNAL_ERROR); 1897 al = SSL_AD_INTERNAL_ERROR; 1898 goto f_err; 1899 } 1900 q += size; 1901 j += size; 1902 } 1903 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa); 1904 if (i < 0) { 1905 al = SSL_AD_DECRYPT_ERROR; 1906 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT); 1907 goto f_err; 1908 } 1909 if (i == 0) { 1910 /* bad signature */ 1911 al = SSL_AD_DECRYPT_ERROR; 1912 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE); 1913 goto f_err; 1914 } 1915 } else 1916#endif 1917 { 1918 if (EVP_VerifyInit_ex(&md_ctx, md, NULL) <= 0 1919 || EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]), 1920 SSL3_RANDOM_SIZE) <= 0 1921 || EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]), 1922 SSL3_RANDOM_SIZE) <= 0 1923 || EVP_VerifyUpdate(&md_ctx, param, param_len) <= 0) { 1924 al = SSL_AD_INTERNAL_ERROR; 1925 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EVP_LIB); 1926 goto f_err; 1927 } 1928 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) { 1929 /* bad signature */ 1930 al = SSL_AD_DECRYPT_ERROR; 1931 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE); 1932 goto f_err; 1933 } 1934 } 1935 } else { 1936 /* aNULL, aSRP or kPSK do not need public keys */ 1937 if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_kPSK)) { 1938 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1939 goto err; 1940 } 1941 /* still data left over */ 1942 if (n != 0) { 1943 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE); 1944 goto f_err; 1945 } 1946 } 1947 EVP_PKEY_free(pkey); 1948 EVP_MD_CTX_cleanup(&md_ctx); 1949 return (1); 1950 f_err: 1951 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1952 err: 1953 EVP_PKEY_free(pkey); 1954#ifndef OPENSSL_NO_RSA 1955 if (rsa != NULL) 1956 RSA_free(rsa); 1957#endif 1958#ifndef OPENSSL_NO_DH 1959 if (dh != NULL) 1960 DH_free(dh); 1961#endif 1962#ifndef OPENSSL_NO_ECDH 1963 BN_CTX_free(bn_ctx); 1964 EC_POINT_free(srvr_ecpoint); 1965 if (ecdh != NULL) 1966 EC_KEY_free(ecdh); 1967#endif 1968 EVP_MD_CTX_cleanup(&md_ctx); 1969 s->state = SSL_ST_ERR; 1970 return (-1); 1971} 1972 1973int ssl3_get_certificate_request(SSL *s) 1974{ 1975 int ok, ret = 0; 1976 unsigned long n, nc, l; 1977 unsigned int llen, ctype_num, i; 1978 X509_NAME *xn = NULL; 1979 const unsigned char *p, *q; 1980 unsigned char *d; 1981 STACK_OF(X509_NAME) *ca_sk = NULL; 1982 1983 n = s->method->ssl_get_message(s, 1984 SSL3_ST_CR_CERT_REQ_A, 1985 SSL3_ST_CR_CERT_REQ_B, 1986 -1, s->max_cert_list, &ok); 1987 1988 if (!ok) 1989 return ((int)n); 1990 1991 s->s3->tmp.cert_req = 0; 1992 1993 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) { 1994 s->s3->tmp.reuse_message = 1; 1995 /* 1996 * If we get here we don't need any cached handshake records as we 1997 * wont be doing client auth. 1998 */ 1999 if (s->s3->handshake_buffer) { 2000 if (!ssl3_digest_cached_records(s)) 2001 goto err; 2002 } 2003 return (1); 2004 } 2005 2006 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 2007 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 2008 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE); 2009 goto err; 2010 } 2011 2012 /* TLS does not like anon-DH with client cert */ 2013 if (s->version > SSL3_VERSION) { 2014 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) { 2015 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 2016 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, 2017 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 2018 goto err; 2019 } 2020 } 2021 2022 p = d = (unsigned char *)s->init_msg; 2023 2024 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 2025 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); 2026 goto err; 2027 } 2028 2029 /* get the certificate types */ 2030 ctype_num = *(p++); 2031 if (ctype_num > SSL3_CT_NUMBER) 2032 ctype_num = SSL3_CT_NUMBER; 2033 for (i = 0; i < ctype_num; i++) 2034 s->s3->tmp.ctype[i] = p[i]; 2035 p += ctype_num; 2036 if (TLS1_get_version(s) >= TLS1_2_VERSION) { 2037 n2s(p, llen); 2038 /* 2039 * Check we have enough room for signature algorithms and following 2040 * length value. 2041 */ 2042 if ((unsigned long)(p - d + llen + 2) > n) { 2043 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2044 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, 2045 SSL_R_DATA_LENGTH_TOO_LONG); 2046 goto err; 2047 } 2048 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen)) { 2049 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2050 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, 2051 SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2052 goto err; 2053 } 2054 p += llen; 2055 } 2056 2057 /* get the CA RDNs */ 2058 n2s(p, llen); 2059#if 0 2060 { 2061 FILE *out; 2062 out = fopen("/tmp/vsign.der", "w"); 2063 fwrite(p, 1, llen, out); 2064 fclose(out); 2065 } 2066#endif 2067 2068 if ((unsigned long)(p - d + llen) != n) { 2069 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2070 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH); 2071 goto err; 2072 } 2073 2074 for (nc = 0; nc < llen;) { 2075 n2s(p, l); 2076 if ((l + nc + 2) > llen) { 2077 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 2078 goto cont; /* netscape bugs */ 2079 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2080 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG); 2081 goto err; 2082 } 2083 2084 q = p; 2085 2086 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) { 2087 /* If netscape tolerance is on, ignore errors */ 2088 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG) 2089 goto cont; 2090 else { 2091 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2092 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB); 2093 goto err; 2094 } 2095 } 2096 2097 if (q != (p + l)) { 2098 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2099 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, 2100 SSL_R_CA_DN_LENGTH_MISMATCH); 2101 goto err; 2102 } 2103 if (!sk_X509_NAME_push(ca_sk, xn)) { 2104 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); 2105 goto err; 2106 } 2107 xn = NULL; 2108 2109 p += l; 2110 nc += l + 2; 2111 } 2112 2113 if (0) { 2114 cont: 2115 ERR_clear_error(); 2116 } 2117 2118 /* we should setup a certificate to return.... */ 2119 s->s3->tmp.cert_req = 1; 2120 s->s3->tmp.ctype_num = ctype_num; 2121 if (s->s3->tmp.ca_names != NULL) 2122 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free); 2123 s->s3->tmp.ca_names = ca_sk; 2124 ca_sk = NULL; 2125 2126 ret = 1; 2127 goto done; 2128 err: 2129 s->state = SSL_ST_ERR; 2130 done: 2131 X509_NAME_free(xn); 2132 if (ca_sk != NULL) 2133 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 2134 return (ret); 2135} 2136 2137static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b) 2138{ 2139 return (X509_NAME_cmp(*a, *b)); 2140} 2141 2142#ifndef OPENSSL_NO_TLSEXT 2143int ssl3_get_new_session_ticket(SSL *s) 2144{ 2145 int ok, al, ret = 0, ticklen; 2146 long n; 2147 const unsigned char *p; 2148 unsigned char *d; 2149 unsigned long ticket_lifetime_hint; 2150 2151 n = s->method->ssl_get_message(s, 2152 SSL3_ST_CR_SESSION_TICKET_A, 2153 SSL3_ST_CR_SESSION_TICKET_B, 2154 SSL3_MT_NEWSESSION_TICKET, 16384, &ok); 2155 2156 if (!ok) 2157 return ((int)n); 2158 2159 if (n < 6) { 2160 /* need at least ticket_lifetime_hint + ticket length */ 2161 al = SSL_AD_DECODE_ERROR; 2162 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH); 2163 goto f_err; 2164 } 2165 2166 p = d = (unsigned char *)s->init_msg; 2167 2168 n2l(p, ticket_lifetime_hint); 2169 n2s(p, ticklen); 2170 /* ticket_lifetime_hint + ticket_length + ticket */ 2171 if (ticklen + 6 != n) { 2172 al = SSL_AD_DECODE_ERROR; 2173 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH); 2174 goto f_err; 2175 } 2176 2177 /* Server is allowed to change its mind and send an empty ticket. */ 2178 if (ticklen == 0) 2179 return 1; 2180 2181 if (s->session->session_id_length > 0) { 2182 int i = s->session_ctx->session_cache_mode; 2183 SSL_SESSION *new_sess; 2184 /* 2185 * We reused an existing session, so we need to replace it with a new 2186 * one 2187 */ 2188 if (i & SSL_SESS_CACHE_CLIENT) { 2189 /* 2190 * Remove the old session from the cache 2191 */ 2192 if (i & SSL_SESS_CACHE_NO_INTERNAL_STORE) { 2193 if (s->session_ctx->remove_session_cb != NULL) 2194 s->session_ctx->remove_session_cb(s->session_ctx, 2195 s->session); 2196 } else { 2197 /* We carry on if this fails */ 2198 SSL_CTX_remove_session(s->session_ctx, s->session); 2199 } 2200 } 2201 2202 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) { 2203 al = SSL_AD_INTERNAL_ERROR; 2204 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE); 2205 goto f_err; 2206 } 2207 2208 SSL_SESSION_free(s->session); 2209 s->session = new_sess; 2210 } 2211 2212 if (s->session->tlsext_tick) { 2213 OPENSSL_free(s->session->tlsext_tick); 2214 s->session->tlsext_ticklen = 0; 2215 } 2216 s->session->tlsext_tick = OPENSSL_malloc(ticklen); 2217 if (!s->session->tlsext_tick) { 2218 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE); 2219 goto err; 2220 } 2221 memcpy(s->session->tlsext_tick, p, ticklen); 2222 s->session->tlsext_tick_lifetime_hint = ticket_lifetime_hint; 2223 s->session->tlsext_ticklen = ticklen; 2224 /* 2225 * There are two ways to detect a resumed ticket session. One is to set 2226 * an appropriate session ID and then the server must return a match in 2227 * ServerHello. This allows the normal client session ID matching to work 2228 * and we know much earlier that the ticket has been accepted. The 2229 * other way is to set zero length session ID when the ticket is 2230 * presented and rely on the handshake to determine session resumption. 2231 * We choose the former approach because this fits in with assumptions 2232 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is 2233 * SHA256 is disabled) hash of the ticket. 2234 */ 2235 EVP_Digest(p, ticklen, 2236 s->session->session_id, &s->session->session_id_length, 2237# ifndef OPENSSL_NO_SHA256 2238 EVP_sha256(), NULL); 2239# else 2240 EVP_sha1(), NULL); 2241# endif 2242 ret = 1; 2243 return (ret); 2244 f_err: 2245 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2246 err: 2247 s->state = SSL_ST_ERR; 2248 return (-1); 2249} 2250 2251int ssl3_get_cert_status(SSL *s) 2252{ 2253 int ok, al; 2254 unsigned long resplen, n; 2255 const unsigned char *p; 2256 2257 n = s->method->ssl_get_message(s, 2258 SSL3_ST_CR_CERT_STATUS_A, 2259 SSL3_ST_CR_CERT_STATUS_B, 2260 -1, 16384, &ok); 2261 2262 if (!ok) 2263 return ((int)n); 2264 2265 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_STATUS) { 2266 /* 2267 * The CertificateStatus message is optional even if 2268 * tlsext_status_expected is set 2269 */ 2270 s->s3->tmp.reuse_message = 1; 2271 } else { 2272 if (n < 4) { 2273 /* need at least status type + length */ 2274 al = SSL_AD_DECODE_ERROR; 2275 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH); 2276 goto f_err; 2277 } 2278 p = (unsigned char *)s->init_msg; 2279 if (*p++ != TLSEXT_STATUSTYPE_ocsp) { 2280 al = SSL_AD_DECODE_ERROR; 2281 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE); 2282 goto f_err; 2283 } 2284 n2l3(p, resplen); 2285 if (resplen + 4 != n) { 2286 al = SSL_AD_DECODE_ERROR; 2287 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH); 2288 goto f_err; 2289 } 2290 s->tlsext_ocsp_resp = BUF_memdup(p, resplen); 2291 if (s->tlsext_ocsp_resp == NULL) { 2292 al = SSL_AD_INTERNAL_ERROR; 2293 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE); 2294 goto f_err; 2295 } 2296 s->tlsext_ocsp_resplen = resplen; 2297 } 2298 if (s->ctx->tlsext_status_cb) { 2299 int ret; 2300 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 2301 if (ret == 0) { 2302 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 2303 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE); 2304 goto f_err; 2305 } 2306 if (ret < 0) { 2307 al = SSL_AD_INTERNAL_ERROR; 2308 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE); 2309 goto f_err; 2310 } 2311 } 2312 return 1; 2313 f_err: 2314 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2315 s->state = SSL_ST_ERR; 2316 return (-1); 2317} 2318#endif 2319 2320int ssl3_get_server_done(SSL *s) 2321{ 2322 int ok, ret = 0; 2323 long n; 2324 2325 /* Second to last param should be very small, like 0 :-) */ 2326 n = s->method->ssl_get_message(s, 2327 SSL3_ST_CR_SRVR_DONE_A, 2328 SSL3_ST_CR_SRVR_DONE_B, 2329 SSL3_MT_SERVER_DONE, 30, &ok); 2330 2331 if (!ok) 2332 return ((int)n); 2333 if (n > 0) { 2334 /* should contain no data */ 2335 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2336 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH); 2337 s->state = SSL_ST_ERR; 2338 return -1; 2339 } 2340 ret = 1; 2341 return (ret); 2342} 2343 2344int ssl3_send_client_key_exchange(SSL *s) 2345{ 2346 unsigned char *p, *d; 2347 int n; 2348 unsigned long alg_k; 2349#ifndef OPENSSL_NO_RSA 2350 unsigned char *q; 2351 EVP_PKEY *pkey = NULL; 2352#endif 2353#ifndef OPENSSL_NO_KRB5 2354 KSSL_ERR kssl_err; 2355#endif /* OPENSSL_NO_KRB5 */ 2356#ifndef OPENSSL_NO_ECDH 2357 EC_KEY *clnt_ecdh = NULL; 2358 const EC_POINT *srvr_ecpoint = NULL; 2359 EVP_PKEY *srvr_pub_pkey = NULL; 2360 unsigned char *encodedPoint = NULL; 2361 int encoded_pt_len = 0; 2362 BN_CTX *bn_ctx = NULL; 2363#endif 2364 2365 if (s->state == SSL3_ST_CW_KEY_EXCH_A) { 2366 d = (unsigned char *)s->init_buf->data; 2367 p = &(d[4]); 2368 2369 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 2370 2371 /* Fool emacs indentation */ 2372 if (0) { 2373 } 2374#ifndef OPENSSL_NO_RSA 2375 else if (alg_k & SSL_kRSA) { 2376 RSA *rsa; 2377 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 2378 2379 if (s->session->sess_cert == NULL) { 2380 /* 2381 * We should always have a server certificate with SSL_kRSA. 2382 */ 2383 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2384 ERR_R_INTERNAL_ERROR); 2385 goto err; 2386 } 2387 2388 if (s->session->sess_cert->peer_rsa_tmp != NULL) 2389 rsa = s->session->sess_cert->peer_rsa_tmp; 2390 else { 2391 pkey = 2392 X509_get_pubkey(s->session-> 2393 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC]. 2394 x509); 2395 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) 2396 || (pkey->pkey.rsa == NULL)) { 2397 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2398 ERR_R_INTERNAL_ERROR); 2399 EVP_PKEY_free(pkey); 2400 goto err; 2401 } 2402 rsa = pkey->pkey.rsa; 2403 EVP_PKEY_free(pkey); 2404 } 2405 2406 tmp_buf[0] = s->client_version >> 8; 2407 tmp_buf[1] = s->client_version & 0xff; 2408 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0) 2409 goto err; 2410 2411 s->session->master_key_length = sizeof tmp_buf; 2412 2413 q = p; 2414 /* Fix buf for TLS and beyond */ 2415 if (s->version > SSL3_VERSION) 2416 p += 2; 2417 n = RSA_public_encrypt(sizeof tmp_buf, 2418 tmp_buf, p, rsa, RSA_PKCS1_PADDING); 2419# ifdef PKCS1_CHECK 2420 if (s->options & SSL_OP_PKCS1_CHECK_1) 2421 p[1]++; 2422 if (s->options & SSL_OP_PKCS1_CHECK_2) 2423 tmp_buf[0] = 0x70; 2424# endif 2425 if (n <= 0) { 2426 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2427 SSL_R_BAD_RSA_ENCRYPT); 2428 goto err; 2429 } 2430 2431 /* Fix buf for TLS and beyond */ 2432 if (s->version > SSL3_VERSION) { 2433 s2n(n, q); 2434 n += 2; 2435 } 2436 2437 s->session->master_key_length = 2438 s->method->ssl3_enc->generate_master_secret(s, 2439 s-> 2440 session->master_key, 2441 tmp_buf, 2442 sizeof tmp_buf); 2443 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 2444 } 2445#endif 2446#ifndef OPENSSL_NO_KRB5 2447 else if (alg_k & SSL_kKRB5) { 2448 krb5_error_code krb5rc; 2449 KSSL_CTX *kssl_ctx = s->kssl_ctx; 2450 /* krb5_data krb5_ap_req; */ 2451 krb5_data *enc_ticket; 2452 krb5_data authenticator, *authp = NULL; 2453 EVP_CIPHER_CTX ciph_ctx; 2454 const EVP_CIPHER *enc = NULL; 2455 unsigned char iv[EVP_MAX_IV_LENGTH]; 2456 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 2457 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH]; 2458 int padl, outl = sizeof(epms); 2459 2460 EVP_CIPHER_CTX_init(&ciph_ctx); 2461 2462# ifdef KSSL_DEBUG 2463 fprintf(stderr, "ssl3_send_client_key_exchange(%lx & %lx)\n", 2464 alg_k, SSL_kKRB5); 2465# endif /* KSSL_DEBUG */ 2466 2467 authp = NULL; 2468# ifdef KRB5SENDAUTH 2469 if (KRB5SENDAUTH) 2470 authp = &authenticator; 2471# endif /* KRB5SENDAUTH */ 2472 2473 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err); 2474 enc = kssl_map_enc(kssl_ctx->enctype); 2475 if (enc == NULL) 2476 goto err; 2477# ifdef KSSL_DEBUG 2478 { 2479 fprintf(stderr, "kssl_cget_tkt rtn %d\n", krb5rc); 2480 if (krb5rc && kssl_err.text) 2481 fprintf(stderr, "kssl_cget_tkt kssl_err=%s\n", 2482 kssl_err.text); 2483 } 2484# endif /* KSSL_DEBUG */ 2485 2486 if (krb5rc) { 2487 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2488 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); 2489 goto err; 2490 } 2491 2492 /*- 2493 * 20010406 VRS - Earlier versions used KRB5 AP_REQ 2494 * in place of RFC 2712 KerberosWrapper, as in: 2495 * 2496 * Send ticket (copy to *p, set n = length) 2497 * n = krb5_ap_req.length; 2498 * memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 2499 * if (krb5_ap_req.data) 2500 * kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 2501 * 2502 * Now using real RFC 2712 KerberosWrapper 2503 * (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 2504 * Note: 2712 "opaque" types are here replaced 2505 * with a 2-byte length followed by the value. 2506 * Example: 2507 * KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 2508 * Where "xx xx" = length bytes. Shown here with 2509 * optional authenticator omitted. 2510 */ 2511 2512 /* KerberosWrapper.Ticket */ 2513 s2n(enc_ticket->length, p); 2514 memcpy(p, enc_ticket->data, enc_ticket->length); 2515 p += enc_ticket->length; 2516 n = enc_ticket->length + 2; 2517 2518 /* KerberosWrapper.Authenticator */ 2519 if (authp && authp->length) { 2520 s2n(authp->length, p); 2521 memcpy(p, authp->data, authp->length); 2522 p += authp->length; 2523 n += authp->length + 2; 2524 2525 free(authp->data); 2526 authp->data = NULL; 2527 authp->length = 0; 2528 } else { 2529 s2n(0, p); /* null authenticator length */ 2530 n += 2; 2531 } 2532 2533 tmp_buf[0] = s->client_version >> 8; 2534 tmp_buf[1] = s->client_version & 0xff; 2535 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0) 2536 goto err; 2537 2538 /*- 2539 * 20010420 VRS. Tried it this way; failed. 2540 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 2541 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 2542 * kssl_ctx->length); 2543 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 2544 */ 2545 2546 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 2547 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv); 2548 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf, 2549 sizeof tmp_buf); 2550 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl); 2551 outl += padl; 2552 if (outl > (int)sizeof epms) { 2553 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2554 ERR_R_INTERNAL_ERROR); 2555 goto err; 2556 } 2557 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2558 2559 /* KerberosWrapper.EncryptedPreMasterSecret */ 2560 s2n(outl, p); 2561 memcpy(p, epms, outl); 2562 p += outl; 2563 n += outl + 2; 2564 2565 s->session->master_key_length = 2566 s->method->ssl3_enc->generate_master_secret(s, 2567 s-> 2568 session->master_key, 2569 tmp_buf, 2570 sizeof tmp_buf); 2571 2572 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 2573 OPENSSL_cleanse(epms, outl); 2574 } 2575#endif 2576#ifndef OPENSSL_NO_DH 2577 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) { 2578 DH *dh_srvr, *dh_clnt; 2579 2580 if (s->session->sess_cert == NULL) { 2581 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 2582 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2583 SSL_R_UNEXPECTED_MESSAGE); 2584 goto err; 2585 } 2586 2587 if (s->session->sess_cert->peer_dh_tmp != NULL) 2588 dh_srvr = s->session->sess_cert->peer_dh_tmp; 2589 else { 2590 /* we get them from the cert */ 2591 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2592 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2593 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2594 goto err; 2595 } 2596 2597 /* generate a new random key */ 2598 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2599 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 2600 goto err; 2601 } 2602 if (!DH_generate_key(dh_clnt)) { 2603 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 2604 DH_free(dh_clnt); 2605 goto err; 2606 } 2607 2608 /* 2609 * use the 'p' output buffer for the DH key, but make sure to 2610 * clear it out afterwards 2611 */ 2612 2613 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt); 2614 2615 if (n <= 0) { 2616 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 2617 DH_free(dh_clnt); 2618 goto err; 2619 } 2620 2621 /* generate master key from the result */ 2622 s->session->master_key_length = 2623 s->method->ssl3_enc->generate_master_secret(s, 2624 s-> 2625 session->master_key, 2626 p, n); 2627 /* clean up */ 2628 memset(p, 0, n); 2629 2630 /* send off the data */ 2631 n = BN_num_bytes(dh_clnt->pub_key); 2632 s2n(n, p); 2633 BN_bn2bin(dh_clnt->pub_key, p); 2634 n += 2; 2635 2636 DH_free(dh_clnt); 2637 } 2638#endif 2639 2640#ifndef OPENSSL_NO_ECDH 2641 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) { 2642 const EC_GROUP *srvr_group = NULL; 2643 EC_KEY *tkey; 2644 int ecdh_clnt_cert = 0; 2645 int field_size = 0; 2646 2647 if (s->session->sess_cert == NULL) { 2648 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 2649 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2650 SSL_R_UNEXPECTED_MESSAGE); 2651 goto err; 2652 } 2653 2654 /* 2655 * Did we send out the client's ECDH share for use in premaster 2656 * computation as part of client certificate? If so, set 2657 * ecdh_clnt_cert to 1. 2658 */ 2659 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) { 2660 /*- 2661 * XXX: For now, we do not support client 2662 * authentication using ECDH certificates. 2663 * To add such support, one needs to add 2664 * code that checks for appropriate 2665 * conditions and sets ecdh_clnt_cert to 1. 2666 * For example, the cert have an ECC 2667 * key on the same curve as the server's 2668 * and the key should be authorized for 2669 * key agreement. 2670 * 2671 * One also needs to add code in ssl3_connect 2672 * to skip sending the certificate verify 2673 * message. 2674 * 2675 * if ((s->cert->key->privatekey != NULL) && 2676 * (s->cert->key->privatekey->type == 2677 * EVP_PKEY_EC) && ...) 2678 * ecdh_clnt_cert = 1; 2679 */ 2680 } 2681 2682 if (s->session->sess_cert->peer_ecdh_tmp != NULL) { 2683 tkey = s->session->sess_cert->peer_ecdh_tmp; 2684 } else { 2685 /* Get the Server Public Key from Cert */ 2686 srvr_pub_pkey = 2687 X509_get_pubkey(s->session-> 2688 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 2689 if ((srvr_pub_pkey == NULL) 2690 || (srvr_pub_pkey->type != EVP_PKEY_EC) 2691 || (srvr_pub_pkey->pkey.ec == NULL)) { 2692 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2693 ERR_R_INTERNAL_ERROR); 2694 goto err; 2695 } 2696 2697 tkey = srvr_pub_pkey->pkey.ec; 2698 } 2699 2700 srvr_group = EC_KEY_get0_group(tkey); 2701 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 2702 2703 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) { 2704 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2705 ERR_R_INTERNAL_ERROR); 2706 goto err; 2707 } 2708 2709 if ((clnt_ecdh = EC_KEY_new()) == NULL) { 2710 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2711 ERR_R_MALLOC_FAILURE); 2712 goto err; 2713 } 2714 2715 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) { 2716 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); 2717 goto err; 2718 } 2719 if (ecdh_clnt_cert) { 2720 /* 2721 * Reuse key info from our certificate We only need our 2722 * private key to perform the ECDH computation. 2723 */ 2724 const BIGNUM *priv_key; 2725 tkey = s->cert->key->privatekey->pkey.ec; 2726 priv_key = EC_KEY_get0_private_key(tkey); 2727 if (priv_key == NULL) { 2728 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2729 ERR_R_MALLOC_FAILURE); 2730 goto err; 2731 } 2732 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) { 2733 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); 2734 goto err; 2735 } 2736 } else { 2737 /* Generate a new ECDH key pair */ 2738 if (!(EC_KEY_generate_key(clnt_ecdh))) { 2739 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2740 ERR_R_ECDH_LIB); 2741 goto err; 2742 } 2743 } 2744 2745 /* 2746 * use the 'p' output buffer for the ECDH key, but make sure to 2747 * clear it out afterwards 2748 */ 2749 2750 field_size = EC_GROUP_get_degree(srvr_group); 2751 if (field_size <= 0) { 2752 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 2753 goto err; 2754 } 2755 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint, 2756 clnt_ecdh, NULL); 2757 if (n <= 0) { 2758 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 2759 goto err; 2760 } 2761 2762 /* generate master key from the result */ 2763 s->session->master_key_length = 2764 s->method->ssl3_enc->generate_master_secret(s, 2765 s-> 2766 session->master_key, 2767 p, n); 2768 2769 memset(p, 0, n); /* clean up */ 2770 2771 if (ecdh_clnt_cert) { 2772 /* Send empty client key exch message */ 2773 n = 0; 2774 } else { 2775 /* 2776 * First check the size of encoding and allocate memory 2777 * accordingly. 2778 */ 2779 encoded_pt_len = 2780 EC_POINT_point2oct(srvr_group, 2781 EC_KEY_get0_public_key(clnt_ecdh), 2782 POINT_CONVERSION_UNCOMPRESSED, 2783 NULL, 0, NULL); 2784 2785 encodedPoint = (unsigned char *) 2786 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char)); 2787 bn_ctx = BN_CTX_new(); 2788 if ((encodedPoint == NULL) || (bn_ctx == NULL)) { 2789 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2790 ERR_R_MALLOC_FAILURE); 2791 goto err; 2792 } 2793 2794 /* Encode the public key */ 2795 n = EC_POINT_point2oct(srvr_group, 2796 EC_KEY_get0_public_key(clnt_ecdh), 2797 POINT_CONVERSION_UNCOMPRESSED, 2798 encodedPoint, encoded_pt_len, bn_ctx); 2799 2800 *p = n; /* length of encoded point */ 2801 /* Encoded point will be copied here */ 2802 p += 1; 2803 /* copy the point */ 2804 memcpy((unsigned char *)p, encodedPoint, n); 2805 /* increment n to account for length field */ 2806 n += 1; 2807 } 2808 2809 /* Free allocated memory */ 2810 BN_CTX_free(bn_ctx); 2811 if (encodedPoint != NULL) 2812 OPENSSL_free(encodedPoint); 2813 if (clnt_ecdh != NULL) 2814 EC_KEY_free(clnt_ecdh); 2815 EVP_PKEY_free(srvr_pub_pkey); 2816 } 2817#endif /* !OPENSSL_NO_ECDH */ 2818 else if (alg_k & SSL_kGOST) { 2819 /* GOST key exchange message creation */ 2820 EVP_PKEY_CTX *pkey_ctx; 2821 X509 *peer_cert; 2822 size_t msglen; 2823 unsigned int md_len; 2824 int keytype; 2825 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2826 EVP_MD_CTX *ukm_hash; 2827 EVP_PKEY *pub_key; 2828 2829 /* 2830 * Get server sertificate PKEY and create ctx from it 2831 */ 2832 peer_cert = 2833 s->session-> 2834 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST01)].x509; 2835 if (!peer_cert) 2836 peer_cert = 2837 s->session-> 2838 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST94)].x509; 2839 if (!peer_cert) { 2840 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2841 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2842 goto err; 2843 } 2844 2845 pkey_ctx = EVP_PKEY_CTX_new(pub_key = 2846 X509_get_pubkey(peer_cert), NULL); 2847 if (pkey_ctx == NULL) { 2848 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2849 ERR_R_MALLOC_FAILURE); 2850 goto err; 2851 } 2852 /* 2853 * If we have send a certificate, and certificate key 2854 * 2855 * * parameters match those of server certificate, use 2856 * certificate key for key exchange 2857 */ 2858 2859 /* Otherwise, generate ephemeral key pair */ 2860 2861 if (pkey_ctx == NULL 2862 || EVP_PKEY_encrypt_init(pkey_ctx) <= 0 2863 /* Generate session key */ 2864 || RAND_bytes(premaster_secret, 32) <= 0) { 2865 EVP_PKEY_CTX_free(pkey_ctx); 2866 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2867 ERR_R_INTERNAL_ERROR); 2868 goto err; 2869 } 2870 /* 2871 * If we have client certificate, use its secret as peer key 2872 */ 2873 if (s->s3->tmp.cert_req && s->cert->key->privatekey) { 2874 if (EVP_PKEY_derive_set_peer 2875 (pkey_ctx, s->cert->key->privatekey) <= 0) { 2876 /* 2877 * If there was an error - just ignore it. Ephemeral key 2878 * * would be used 2879 */ 2880 ERR_clear_error(); 2881 } 2882 } 2883 /* 2884 * Compute shared IV and store it in algorithm-specific context 2885 * data 2886 */ 2887 ukm_hash = EVP_MD_CTX_create(); 2888 if (EVP_DigestInit(ukm_hash, 2889 EVP_get_digestbynid(NID_id_GostR3411_94)) <= 0 2890 || EVP_DigestUpdate(ukm_hash, s->s3->client_random, 2891 SSL3_RANDOM_SIZE) <= 0 2892 || EVP_DigestUpdate(ukm_hash, s->s3->server_random, 2893 SSL3_RANDOM_SIZE) <= 0 2894 || EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len) <= 0) { 2895 EVP_MD_CTX_destroy(ukm_hash); 2896 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2897 ERR_R_INTERNAL_ERROR); 2898 goto err; 2899 } 2900 EVP_MD_CTX_destroy(ukm_hash); 2901 if (EVP_PKEY_CTX_ctrl 2902 (pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8, 2903 shared_ukm) < 0) { 2904 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2905 SSL_R_LIBRARY_BUG); 2906 goto err; 2907 } 2908 /* Make GOST keytransport blob message */ 2909 /* 2910 * Encapsulate it into sequence 2911 */ 2912 *(p++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED; 2913 msglen = 255; 2914 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 32) 2915 <= 0) { 2916 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2917 SSL_R_LIBRARY_BUG); 2918 goto err; 2919 } 2920 if (msglen >= 0x80) { 2921 *(p++) = 0x81; 2922 *(p++) = msglen & 0xff; 2923 n = msglen + 3; 2924 } else { 2925 *(p++) = msglen & 0xff; 2926 n = msglen + 2; 2927 } 2928 memcpy(p, tmp, msglen); 2929 /* Check if pubkey from client certificate was used */ 2930 if (EVP_PKEY_CTX_ctrl 2931 (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) { 2932 /* Set flag "skip certificate verify" */ 2933 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2934 } 2935 EVP_PKEY_CTX_free(pkey_ctx); 2936 s->session->master_key_length = 2937 s->method->ssl3_enc->generate_master_secret(s, 2938 s-> 2939 session->master_key, 2940 premaster_secret, 2941 32); 2942 EVP_PKEY_free(pub_key); 2943 2944 } 2945#ifndef OPENSSL_NO_SRP 2946 else if (alg_k & SSL_kSRP) { 2947 if (s->srp_ctx.A != NULL) { 2948 /* send off the data */ 2949 n = BN_num_bytes(s->srp_ctx.A); 2950 s2n(n, p); 2951 BN_bn2bin(s->srp_ctx.A, p); 2952 n += 2; 2953 } else { 2954 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2955 ERR_R_INTERNAL_ERROR); 2956 goto err; 2957 } 2958 if (s->session->srp_username != NULL) 2959 OPENSSL_free(s->session->srp_username); 2960 s->session->srp_username = BUF_strdup(s->srp_ctx.login); 2961 if (s->session->srp_username == NULL) { 2962 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2963 ERR_R_MALLOC_FAILURE); 2964 goto err; 2965 } 2966 2967 if ((s->session->master_key_length = 2968 SRP_generate_client_master_secret(s, 2969 s->session->master_key)) < 2970 0) { 2971 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2972 ERR_R_INTERNAL_ERROR); 2973 goto err; 2974 } 2975 } 2976#endif 2977#ifndef OPENSSL_NO_PSK 2978 else if (alg_k & SSL_kPSK) { 2979 /* 2980 * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a 2981 * \0-terminated identity. The last byte is for us for simulating 2982 * strnlen. 2983 */ 2984 char identity[PSK_MAX_IDENTITY_LEN + 2]; 2985 size_t identity_len; 2986 unsigned char *t = NULL; 2987 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4]; 2988 unsigned int pre_ms_len = 0, psk_len = 0; 2989 int psk_err = 1; 2990 2991 n = 0; 2992 if (s->psk_client_callback == NULL) { 2993 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2994 SSL_R_PSK_NO_CLIENT_CB); 2995 goto err; 2996 } 2997 2998 memset(identity, 0, sizeof(identity)); 2999 psk_len = s->psk_client_callback(s, s->session->psk_identity_hint, 3000 identity, sizeof(identity) - 1, 3001 psk_or_pre_ms, 3002 sizeof(psk_or_pre_ms)); 3003 if (psk_len > PSK_MAX_PSK_LEN) { 3004 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3005 ERR_R_INTERNAL_ERROR); 3006 goto psk_err; 3007 } else if (psk_len == 0) { 3008 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3009 SSL_R_PSK_IDENTITY_NOT_FOUND); 3010 goto psk_err; 3011 } 3012 identity[PSK_MAX_IDENTITY_LEN + 1] = '\0'; 3013 identity_len = strlen(identity); 3014 if (identity_len > PSK_MAX_IDENTITY_LEN) { 3015 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3016 ERR_R_INTERNAL_ERROR); 3017 goto psk_err; 3018 } 3019 /* create PSK pre_master_secret */ 3020 pre_ms_len = 2 + psk_len + 2 + psk_len; 3021 t = psk_or_pre_ms; 3022 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len); 3023 s2n(psk_len, t); 3024 memset(t, 0, psk_len); 3025 t += psk_len; 3026 s2n(psk_len, t); 3027 3028 if (s->session->psk_identity_hint != NULL) 3029 OPENSSL_free(s->session->psk_identity_hint); 3030 s->session->psk_identity_hint = 3031 BUF_strdup(s->ctx->psk_identity_hint); 3032 if (s->ctx->psk_identity_hint != NULL 3033 && s->session->psk_identity_hint == NULL) { 3034 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3035 ERR_R_MALLOC_FAILURE); 3036 goto psk_err; 3037 } 3038 3039 if (s->session->psk_identity != NULL) 3040 OPENSSL_free(s->session->psk_identity); 3041 s->session->psk_identity = BUF_strdup(identity); 3042 if (s->session->psk_identity == NULL) { 3043 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3044 ERR_R_MALLOC_FAILURE); 3045 goto psk_err; 3046 } 3047 3048 s->session->master_key_length = 3049 s->method->ssl3_enc->generate_master_secret(s, 3050 s-> 3051 session->master_key, 3052 psk_or_pre_ms, 3053 pre_ms_len); 3054 s2n(identity_len, p); 3055 memcpy(p, identity, identity_len); 3056 n = 2 + identity_len; 3057 psk_err = 0; 3058 psk_err: 3059 OPENSSL_cleanse(identity, sizeof(identity)); 3060 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 3061 if (psk_err != 0) { 3062 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 3063 goto err; 3064 } 3065 } 3066#endif 3067 else { 3068 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 3069 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 3070 goto err; 3071 } 3072 3073 *(d++) = SSL3_MT_CLIENT_KEY_EXCHANGE; 3074 l2n3(n, d); 3075 3076 s->state = SSL3_ST_CW_KEY_EXCH_B; 3077 /* number of bytes to write */ 3078 s->init_num = n + 4; 3079 s->init_off = 0; 3080 } 3081 3082 /* SSL3_ST_CW_KEY_EXCH_B */ 3083 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE)); 3084 err: 3085#ifndef OPENSSL_NO_ECDH 3086 BN_CTX_free(bn_ctx); 3087 if (encodedPoint != NULL) 3088 OPENSSL_free(encodedPoint); 3089 if (clnt_ecdh != NULL) 3090 EC_KEY_free(clnt_ecdh); 3091 EVP_PKEY_free(srvr_pub_pkey); 3092#endif 3093 s->state = SSL_ST_ERR; 3094 return (-1); 3095} 3096 3097int ssl3_send_client_verify(SSL *s) 3098{ 3099 unsigned char *p, *d; 3100 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 3101 EVP_PKEY *pkey; 3102 EVP_PKEY_CTX *pctx = NULL; 3103 EVP_MD_CTX mctx; 3104 unsigned u = 0; 3105 unsigned long n; 3106 int j; 3107 3108 EVP_MD_CTX_init(&mctx); 3109 3110 if (s->state == SSL3_ST_CW_CERT_VRFY_A) { 3111 d = (unsigned char *)s->init_buf->data; 3112 p = &(d[4]); 3113 pkey = s->cert->key->privatekey; 3114/* Create context from key and test if sha1 is allowed as digest */ 3115 pctx = EVP_PKEY_CTX_new(pkey, NULL); 3116 if (pctx == NULL || EVP_PKEY_sign_init(pctx) <= 0) { 3117 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 3118 goto err; 3119 } 3120 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) { 3121 if (TLS1_get_version(s) < TLS1_2_VERSION) 3122 s->method->ssl3_enc->cert_verify_mac(s, 3123 NID_sha1, 3124 &(data 3125 [MD5_DIGEST_LENGTH])); 3126 } else { 3127 ERR_clear_error(); 3128 } 3129 /* 3130 * For TLS v1.2 send signature algorithm and signature using agreed 3131 * digest and cached handshake records. 3132 */ 3133 if (TLS1_get_version(s) >= TLS1_2_VERSION) { 3134 long hdatalen = 0; 3135 void *hdata; 3136 const EVP_MD *md = s->cert->key->digest; 3137 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); 3138 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) { 3139 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 3140 goto err; 3141 } 3142 p += 2; 3143#ifdef SSL_DEBUG 3144 fprintf(stderr, "Using TLS 1.2 with client alg %s\n", 3145 EVP_MD_name(md)); 3146#endif 3147 if (!EVP_SignInit_ex(&mctx, md, NULL) 3148 || !EVP_SignUpdate(&mctx, hdata, hdatalen) 3149 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) { 3150 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_EVP_LIB); 3151 goto err; 3152 } 3153 s2n(u, p); 3154 n = u + 4; 3155 if (!ssl3_digest_cached_records(s)) 3156 goto err; 3157 } else 3158#ifndef OPENSSL_NO_RSA 3159 if (pkey->type == EVP_PKEY_RSA) { 3160 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0])); 3161 if (RSA_sign(NID_md5_sha1, data, 3162 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, 3163 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 3164 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB); 3165 goto err; 3166 } 3167 s2n(u, p); 3168 n = u + 2; 3169 } else 3170#endif 3171#ifndef OPENSSL_NO_DSA 3172 if (pkey->type == EVP_PKEY_DSA) { 3173 if (!DSA_sign(pkey->save_type, 3174 &(data[MD5_DIGEST_LENGTH]), 3175 SHA_DIGEST_LENGTH, &(p[2]), 3176 (unsigned int *)&j, pkey->pkey.dsa)) { 3177 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB); 3178 goto err; 3179 } 3180 s2n(j, p); 3181 n = j + 2; 3182 } else 3183#endif 3184#ifndef OPENSSL_NO_ECDSA 3185 if (pkey->type == EVP_PKEY_EC) { 3186 if (!ECDSA_sign(pkey->save_type, 3187 &(data[MD5_DIGEST_LENGTH]), 3188 SHA_DIGEST_LENGTH, &(p[2]), 3189 (unsigned int *)&j, pkey->pkey.ec)) { 3190 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB); 3191 goto err; 3192 } 3193 s2n(j, p); 3194 n = j + 2; 3195 } else 3196#endif 3197 if (pkey->type == NID_id_GostR3410_94 3198 || pkey->type == NID_id_GostR3410_2001) { 3199 unsigned char signbuf[64]; 3200 int i; 3201 size_t sigsize = 64; 3202 s->method->ssl3_enc->cert_verify_mac(s, 3203 NID_id_GostR3411_94, data); 3204 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) { 3205 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 3206 goto err; 3207 } 3208 for (i = 63, j = 0; i >= 0; j++, i--) { 3209 p[2 + j] = signbuf[i]; 3210 } 3211 s2n(j, p); 3212 n = j + 2; 3213 } else { 3214 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 3215 goto err; 3216 } 3217 *(d++) = SSL3_MT_CERTIFICATE_VERIFY; 3218 l2n3(n, d); 3219 3220 s->state = SSL3_ST_CW_CERT_VRFY_B; 3221 s->init_num = (int)n + 4; 3222 s->init_off = 0; 3223 } 3224 EVP_MD_CTX_cleanup(&mctx); 3225 EVP_PKEY_CTX_free(pctx); 3226 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE)); 3227 err: 3228 EVP_MD_CTX_cleanup(&mctx); 3229 EVP_PKEY_CTX_free(pctx); 3230 s->state = SSL_ST_ERR; 3231 return (-1); 3232} 3233 3234int ssl3_send_client_certificate(SSL *s) 3235{ 3236 X509 *x509 = NULL; 3237 EVP_PKEY *pkey = NULL; 3238 int i; 3239 unsigned long l; 3240 3241 if (s->state == SSL3_ST_CW_CERT_A) { 3242 if ((s->cert == NULL) || 3243 (s->cert->key->x509 == NULL) || 3244 (s->cert->key->privatekey == NULL)) 3245 s->state = SSL3_ST_CW_CERT_B; 3246 else 3247 s->state = SSL3_ST_CW_CERT_C; 3248 } 3249 3250 /* We need to get a client cert */ 3251 if (s->state == SSL3_ST_CW_CERT_B) { 3252 /* 3253 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; 3254 * return(-1); We then get retied later 3255 */ 3256 i = ssl_do_client_cert_cb(s, &x509, &pkey); 3257 if (i < 0) { 3258 s->rwstate = SSL_X509_LOOKUP; 3259 return (-1); 3260 } 3261 s->rwstate = SSL_NOTHING; 3262 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 3263 s->state = SSL3_ST_CW_CERT_B; 3264 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) 3265 i = 0; 3266 } else if (i == 1) { 3267 i = 0; 3268 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, 3269 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 3270 } 3271 3272 if (x509 != NULL) 3273 X509_free(x509); 3274 if (pkey != NULL) 3275 EVP_PKEY_free(pkey); 3276 if (i == 0) { 3277 if (s->version == SSL3_VERSION) { 3278 s->s3->tmp.cert_req = 0; 3279 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE); 3280 return (1); 3281 } else { 3282 s->s3->tmp.cert_req = 2; 3283 } 3284 } 3285 3286 /* Ok, we have a cert */ 3287 s->state = SSL3_ST_CW_CERT_C; 3288 } 3289 3290 if (s->state == SSL3_ST_CW_CERT_C) { 3291 s->state = SSL3_ST_CW_CERT_D; 3292 l = ssl3_output_cert_chain(s, 3293 (s->s3->tmp.cert_req == 3294 2) ? NULL : s->cert->key->x509); 3295 if (!l) { 3296 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 3297 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 3298 s->state = SSL_ST_ERR; 3299 return 0; 3300 } 3301 s->init_num = (int)l; 3302 s->init_off = 0; 3303 } 3304 /* SSL3_ST_CW_CERT_D */ 3305 return (ssl3_do_write(s, SSL3_RT_HANDSHAKE)); 3306} 3307 3308#define has_bits(i,m) (((i)&(m)) == (m)) 3309 3310int ssl3_check_cert_and_algorithm(SSL *s) 3311{ 3312 int i, idx; 3313 long alg_k, alg_a; 3314 EVP_PKEY *pkey = NULL; 3315 int pkey_bits; 3316 SESS_CERT *sc; 3317#ifndef OPENSSL_NO_RSA 3318 RSA *rsa; 3319#endif 3320#ifndef OPENSSL_NO_DH 3321 DH *dh; 3322#endif 3323 int al = SSL_AD_HANDSHAKE_FAILURE; 3324 3325 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 3326 alg_a = s->s3->tmp.new_cipher->algorithm_auth; 3327 3328 /* we don't have a certificate */ 3329 if ((alg_a & (SSL_aDH | SSL_aNULL | SSL_aKRB5)) || (alg_k & SSL_kPSK)) 3330 return (1); 3331 3332 sc = s->session->sess_cert; 3333 if (sc == NULL) { 3334 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); 3335 goto err; 3336 } 3337#ifndef OPENSSL_NO_RSA 3338 rsa = s->session->sess_cert->peer_rsa_tmp; 3339#endif 3340#ifndef OPENSSL_NO_DH 3341 dh = s->session->sess_cert->peer_dh_tmp; 3342#endif 3343 3344 /* This is the passed certificate */ 3345 3346 idx = sc->peer_cert_type; 3347#ifndef OPENSSL_NO_ECDH 3348 if (idx == SSL_PKEY_ECC) { 3349 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, s) == 0) { 3350 /* check failed */ 3351 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT); 3352 goto f_err; 3353 } else { 3354 return 1; 3355 } 3356 } 3357#endif 3358 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 3359 pkey_bits = EVP_PKEY_bits(pkey); 3360 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 3361 EVP_PKEY_free(pkey); 3362 3363 /* Check that we have a certificate if we require one */ 3364 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) { 3365 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3366 SSL_R_MISSING_RSA_SIGNING_CERT); 3367 goto f_err; 3368 } 3369#ifndef OPENSSL_NO_DSA 3370 else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) { 3371 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3372 SSL_R_MISSING_DSA_SIGNING_CERT); 3373 goto f_err; 3374 } 3375#endif 3376#ifndef OPENSSL_NO_RSA 3377 if (alg_k & SSL_kRSA) { 3378 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 3379 !has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) { 3380 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3381 SSL_R_MISSING_RSA_ENCRYPTING_CERT); 3382 goto f_err; 3383 } else if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) { 3384 if (pkey_bits <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3385 if (!has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) { 3386 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3387 SSL_R_MISSING_RSA_ENCRYPTING_CERT); 3388 goto f_err; 3389 } 3390 if (rsa != NULL) { 3391 /* server key exchange is not allowed. */ 3392 al = SSL_AD_INTERNAL_ERROR; 3393 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); 3394 goto f_err; 3395 } 3396 } 3397 } 3398 } 3399#endif 3400#ifndef OPENSSL_NO_DH 3401 if ((alg_k & SSL_kEDH) && dh == NULL) { 3402 al = SSL_AD_INTERNAL_ERROR; 3403 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); 3404 goto f_err; 3405 } 3406 if ((alg_k & SSL_kDHr) && !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) { 3407 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3408 SSL_R_MISSING_DH_RSA_CERT); 3409 goto f_err; 3410 } 3411# ifndef OPENSSL_NO_DSA 3412 if ((alg_k & SSL_kDHd) && !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) { 3413 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3414 SSL_R_MISSING_DH_DSA_CERT); 3415 goto f_err; 3416 } 3417# endif 3418 3419 /* Check DHE only: static DH not implemented. */ 3420 if (alg_k & SSL_kEDH) { 3421 int dh_size = BN_num_bits(dh->p); 3422 if ((!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 1024) 3423 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 512)) { 3424 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_DH_KEY_TOO_SMALL); 3425 goto f_err; 3426 } 3427 } 3428#endif /* !OPENSSL_NO_DH */ 3429 3430 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 3431 pkey_bits > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3432#ifndef OPENSSL_NO_RSA 3433 if (alg_k & SSL_kRSA) { 3434 if (rsa == NULL) { 3435 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3436 SSL_R_MISSING_EXPORT_TMP_RSA_KEY); 3437 goto f_err; 3438 } else if (BN_num_bits(rsa->n) > 3439 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3440 /* We have a temporary RSA key but it's too large. */ 3441 al = SSL_AD_EXPORT_RESTRICTION; 3442 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3443 SSL_R_MISSING_EXPORT_TMP_RSA_KEY); 3444 goto f_err; 3445 } 3446 } else 3447#endif 3448#ifndef OPENSSL_NO_DH 3449 if (alg_k & SSL_kEDH) { 3450 if (BN_num_bits(dh->p) > 3451 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3452 /* We have a temporary DH key but it's too large. */ 3453 al = SSL_AD_EXPORT_RESTRICTION; 3454 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3455 SSL_R_MISSING_EXPORT_TMP_DH_KEY); 3456 goto f_err; 3457 } 3458 } else if (alg_k & (SSL_kDHr | SSL_kDHd)) { 3459 /* The cert should have had an export DH key. */ 3460 al = SSL_AD_EXPORT_RESTRICTION; 3461 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3462 SSL_R_MISSING_EXPORT_TMP_DH_KEY); 3463 goto f_err; 3464 } else 3465#endif 3466 { 3467 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3468 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 3469 goto f_err; 3470 } 3471 } 3472 return (1); 3473 f_err: 3474 ssl3_send_alert(s, SSL3_AL_FATAL, al); 3475 err: 3476 return (0); 3477} 3478 3479#ifndef OPENSSL_NO_TLSEXT 3480/* 3481 * Normally, we can tell if the server is resuming the session from 3482 * the session ID. EAP-FAST (RFC 4851), however, relies on the next server 3483 * message after the ServerHello to determine if the server is resuming. 3484 * Therefore, we allow EAP-FAST to peek ahead. 3485 * ssl3_check_finished returns 1 if we are resuming from an external 3486 * pre-shared secret, we have a "ticket" and the next server handshake message 3487 * is Finished; and 0 otherwise. It returns -1 upon an error. 3488 */ 3489static int ssl3_check_finished(SSL *s) 3490{ 3491 int ok = 0; 3492 3493 if (s->version < TLS1_VERSION || !s->tls_session_secret_cb || 3494 !s->session->tlsext_tick) 3495 return 0; 3496 3497 /* Need to permit this temporarily, in case the next message is Finished. */ 3498 s->s3->flags |= SSL3_FLAGS_CCS_OK; 3499 /* 3500 * This function is called when we might get a Certificate message instead, 3501 * so permit appropriate message length. 3502 * We ignore the return value as we're only interested in the message type 3503 * and not its length. 3504 */ 3505 s->method->ssl_get_message(s, 3506 SSL3_ST_CR_CERT_A, 3507 SSL3_ST_CR_CERT_B, 3508 -1, s->max_cert_list, &ok); 3509 s->s3->flags &= ~SSL3_FLAGS_CCS_OK; 3510 3511 if (!ok) 3512 return -1; 3513 3514 s->s3->tmp.reuse_message = 1; 3515 3516 if (s->s3->tmp.message_type == SSL3_MT_FINISHED) 3517 return 1; 3518 3519 /* If we're not done, then the CCS arrived early and we should bail. */ 3520 if (s->s3->change_cipher_spec) { 3521 SSLerr(SSL_F_SSL3_CHECK_FINISHED, SSL_R_CCS_RECEIVED_EARLY); 3522 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 3523 return -1; 3524 } 3525 3526 return 0; 3527} 3528 3529# ifndef OPENSSL_NO_NEXTPROTONEG 3530int ssl3_send_next_proto(SSL *s) 3531{ 3532 unsigned int len, padding_len; 3533 unsigned char *d; 3534 3535 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) { 3536 len = s->next_proto_negotiated_len; 3537 padding_len = 32 - ((len + 2) % 32); 3538 d = (unsigned char *)s->init_buf->data; 3539 d[4] = len; 3540 memcpy(d + 5, s->next_proto_negotiated, len); 3541 d[5 + len] = padding_len; 3542 memset(d + 6 + len, 0, padding_len); 3543 *(d++) = SSL3_MT_NEXT_PROTO; 3544 l2n3(2 + len + padding_len, d); 3545 s->state = SSL3_ST_CW_NEXT_PROTO_B; 3546 s->init_num = 4 + 2 + len + padding_len; 3547 s->init_off = 0; 3548 } 3549 3550 return ssl3_do_write(s, SSL3_RT_HANDSHAKE); 3551} 3552#endif /* !OPENSSL_NO_NEXTPROTONEG */ 3553#endif /* !OPENSSL_NO_TLSEXT */ 3554 3555int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 3556{ 3557 int i = 0; 3558#ifndef OPENSSL_NO_ENGINE 3559 if (s->ctx->client_cert_engine) { 3560 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s, 3561 SSL_get_client_CA_list(s), 3562 px509, ppkey, NULL, NULL, NULL); 3563 if (i != 0) 3564 return i; 3565 } 3566#endif 3567 if (s->ctx->client_cert_cb) 3568 i = s->ctx->client_cert_cb(s, px509, ppkey); 3569 return i; 3570} 3571