s3_clnt.c revision 306195
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 } 323 s->init_num = 0; 324 break; 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 int al = 0; 679#ifndef OPENSSL_NO_COMP 680 int j; 681 SSL_COMP *comp; 682#endif 683 684 buf = (unsigned char *)s->init_buf->data; 685 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) { 686 SSL_SESSION *sess = s->session; 687 if ((sess == NULL) || (sess->ssl_version != s->version) || 688#ifdef OPENSSL_NO_TLSEXT 689 !sess->session_id_length || 690#else 691 /* 692 * In the case of EAP-FAST, we can have a pre-shared 693 * "ticket" without a session ID. 694 */ 695 (!sess->session_id_length && !sess->tlsext_tick) || 696#endif 697 (sess->not_resumable)) { 698 if (!ssl_get_new_session(s, 0)) 699 goto err; 700 } 701 if (s->method->version == DTLS_ANY_VERSION) { 702 /* Determine which DTLS version to use */ 703 int options = s->options; 704 /* If DTLS 1.2 disabled correct the version number */ 705 if (options & SSL_OP_NO_DTLSv1_2) { 706 if (tls1_suiteb(s)) { 707 SSLerr(SSL_F_SSL3_CLIENT_HELLO, 708 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE); 709 goto err; 710 } 711 /* 712 * Disabling all versions is silly: return an error. 713 */ 714 if (options & SSL_OP_NO_DTLSv1) { 715 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_WRONG_SSL_VERSION); 716 goto err; 717 } 718 /* 719 * Update method so we don't use any DTLS 1.2 features. 720 */ 721 s->method = DTLSv1_client_method(); 722 s->version = DTLS1_VERSION; 723 } else { 724 /* 725 * We only support one version: update method 726 */ 727 if (options & SSL_OP_NO_DTLSv1) 728 s->method = DTLSv1_2_client_method(); 729 s->version = DTLS1_2_VERSION; 730 } 731 s->client_version = s->version; 732 } 733 /* else use the pre-loaded session */ 734 735 p = s->s3->client_random; 736 737 /* 738 * for DTLS if client_random is initialized, reuse it, we are 739 * required to use same upon reply to HelloVerify 740 */ 741 if (SSL_IS_DTLS(s)) { 742 size_t idx; 743 i = 1; 744 for (idx = 0; idx < sizeof(s->s3->client_random); idx++) { 745 if (p[idx]) { 746 i = 0; 747 break; 748 } 749 } 750 } else 751 i = 1; 752 753 if (i && ssl_fill_hello_random(s, 0, p, 754 sizeof(s->s3->client_random)) <= 0) 755 goto err; 756 757 /* Do the message type and length last */ 758 d = p = ssl_handshake_start(s); 759 760 /*- 761 * version indicates the negotiated version: for example from 762 * an SSLv2/v3 compatible client hello). The client_version 763 * field is the maximum version we permit and it is also 764 * used in RSA encrypted premaster secrets. Some servers can 765 * choke if we initially report a higher version then 766 * renegotiate to a lower one in the premaster secret. This 767 * didn't happen with TLS 1.0 as most servers supported it 768 * but it can with TLS 1.1 or later if the server only supports 769 * 1.0. 770 * 771 * Possible scenario with previous logic: 772 * 1. Client hello indicates TLS 1.2 773 * 2. Server hello says TLS 1.0 774 * 3. RSA encrypted premaster secret uses 1.2. 775 * 4. Handhaked proceeds using TLS 1.0. 776 * 5. Server sends hello request to renegotiate. 777 * 6. Client hello indicates TLS v1.0 as we now 778 * know that is maximum server supports. 779 * 7. Server chokes on RSA encrypted premaster secret 780 * containing version 1.0. 781 * 782 * For interoperability it should be OK to always use the 783 * maximum version we support in client hello and then rely 784 * on the checking of version to ensure the servers isn't 785 * being inconsistent: for example initially negotiating with 786 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 787 * client_version in client hello and not resetting it to 788 * the negotiated version. 789 */ 790#if 0 791 *(p++) = s->version >> 8; 792 *(p++) = s->version & 0xff; 793 s->client_version = s->version; 794#else 795 *(p++) = s->client_version >> 8; 796 *(p++) = s->client_version & 0xff; 797#endif 798 799 /* Random stuff */ 800 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); 801 p += SSL3_RANDOM_SIZE; 802 803 /* Session ID */ 804 if (s->new_session) 805 i = 0; 806 else 807 i = s->session->session_id_length; 808 *(p++) = i; 809 if (i != 0) { 810 if (i > (int)sizeof(s->session->session_id)) { 811 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 812 goto err; 813 } 814 memcpy(p, s->session->session_id, i); 815 p += i; 816 } 817 818 /* cookie stuff for DTLS */ 819 if (SSL_IS_DTLS(s)) { 820 if (s->d1->cookie_len > sizeof(s->d1->cookie)) { 821 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 822 goto err; 823 } 824 *(p++) = s->d1->cookie_len; 825 memcpy(p, s->d1->cookie, s->d1->cookie_len); 826 p += s->d1->cookie_len; 827 } 828 829 /* Ciphers supported */ 830 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0); 831 if (i == 0) { 832 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE); 833 goto err; 834 } 835#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH 836 /* 837 * Some servers hang if client hello > 256 bytes as hack workaround 838 * chop number of supported ciphers to keep it well below this if we 839 * use TLS v1.2 840 */ 841 if (TLS1_get_version(s) >= TLS1_2_VERSION 842 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH) 843 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1; 844#endif 845 s2n(i, p); 846 p += i; 847 848 /* COMPRESSION */ 849#ifdef OPENSSL_NO_COMP 850 *(p++) = 1; 851#else 852 853 if ((s->options & SSL_OP_NO_COMPRESSION) 854 || !s->ctx->comp_methods) 855 j = 0; 856 else 857 j = sk_SSL_COMP_num(s->ctx->comp_methods); 858 *(p++) = 1 + j; 859 for (i = 0; i < j; i++) { 860 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i); 861 *(p++) = comp->id; 862 } 863#endif 864 *(p++) = 0; /* Add the NULL method */ 865 866#ifndef OPENSSL_NO_TLSEXT 867 /* TLS extensions */ 868 if (ssl_prepare_clienthello_tlsext(s) <= 0) { 869 SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); 870 goto err; 871 } 872 if ((p = 873 ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH, 874 &al)) == NULL) { 875 ssl3_send_alert(s, SSL3_AL_FATAL, al); 876 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); 877 goto err; 878 } 879#endif 880 881 l = p - d; 882 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l); 883 s->state = SSL3_ST_CW_CLNT_HELLO_B; 884 } 885 886 /* SSL3_ST_CW_CLNT_HELLO_B */ 887 return ssl_do_write(s); 888 err: 889 s->state = SSL_ST_ERR; 890 return (-1); 891} 892 893int ssl3_get_server_hello(SSL *s) 894{ 895 STACK_OF(SSL_CIPHER) *sk; 896 const SSL_CIPHER *c; 897 CERT *ct = s->cert; 898 unsigned char *p, *d; 899 int i, al = SSL_AD_INTERNAL_ERROR, ok; 900 unsigned int j; 901 long n; 902#ifndef OPENSSL_NO_COMP 903 SSL_COMP *comp; 904#endif 905 /* 906 * Hello verify request and/or server hello version may not match so set 907 * first packet if we're negotiating version. 908 */ 909 if (SSL_IS_DTLS(s)) 910 s->first_packet = 1; 911 912 n = s->method->ssl_get_message(s, 913 SSL3_ST_CR_SRVR_HELLO_A, 914 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, &ok); 915 916 if (!ok) 917 return ((int)n); 918 919 if (SSL_IS_DTLS(s)) { 920 s->first_packet = 0; 921 if (s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 922 if (s->d1->send_cookie == 0) { 923 s->s3->tmp.reuse_message = 1; 924 return 1; 925 } else { /* already sent a cookie */ 926 927 al = SSL_AD_UNEXPECTED_MESSAGE; 928 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE); 929 goto f_err; 930 } 931 } 932 } 933 934 if (s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO) { 935 al = SSL_AD_UNEXPECTED_MESSAGE; 936 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_MESSAGE_TYPE); 937 goto f_err; 938 } 939 940 d = p = (unsigned char *)s->init_msg; 941 if (s->method->version == DTLS_ANY_VERSION) { 942 /* Work out correct protocol version to use */ 943 int hversion = (p[0] << 8) | p[1]; 944 int options = s->options; 945 if (hversion == DTLS1_2_VERSION && !(options & SSL_OP_NO_DTLSv1_2)) 946 s->method = DTLSv1_2_client_method(); 947 else if (tls1_suiteb(s)) { 948 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 949 SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE); 950 s->version = hversion; 951 al = SSL_AD_PROTOCOL_VERSION; 952 goto f_err; 953 } else if (hversion == DTLS1_VERSION && !(options & SSL_OP_NO_DTLSv1)) 954 s->method = DTLSv1_client_method(); 955 else { 956 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION); 957 s->version = hversion; 958 al = SSL_AD_PROTOCOL_VERSION; 959 goto f_err; 960 } 961 s->session->ssl_version = s->version = s->method->version; 962 } 963 964 if ((p[0] != (s->version >> 8)) || (p[1] != (s->version & 0xff))) { 965 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_SSL_VERSION); 966 s->version = (s->version & 0xff00) | p[1]; 967 al = SSL_AD_PROTOCOL_VERSION; 968 goto f_err; 969 } 970 p += 2; 971 972 /* load the server hello data */ 973 /* load the server random */ 974 memcpy(s->s3->server_random, p, SSL3_RANDOM_SIZE); 975 p += SSL3_RANDOM_SIZE; 976 977 s->hit = 0; 978 979 /* get the session-id */ 980 j = *(p++); 981 982 if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE)) { 983 al = SSL_AD_ILLEGAL_PARAMETER; 984 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG); 985 goto f_err; 986 } 987#ifndef OPENSSL_NO_TLSEXT 988 /* 989 * Check if we can resume the session based on external pre-shared secret. 990 * EAP-FAST (RFC 4851) supports two types of session resumption. 991 * Resumption based on server-side state works with session IDs. 992 * Resumption based on pre-shared Protected Access Credentials (PACs) 993 * works by overriding the SessionTicket extension at the application 994 * layer, and does not send a session ID. (We do not know whether EAP-FAST 995 * servers would honour the session ID.) Therefore, the session ID alone 996 * is not a reliable indicator of session resumption, so we first check if 997 * we can resume, and later peek at the next handshake message to see if the 998 * server wants to resume. 999 */ 1000 if (s->version >= TLS1_VERSION && s->tls_session_secret_cb && 1001 s->session->tlsext_tick) { 1002 SSL_CIPHER *pref_cipher = NULL; 1003 s->session->master_key_length = sizeof(s->session->master_key); 1004 if (s->tls_session_secret_cb(s, s->session->master_key, 1005 &s->session->master_key_length, 1006 NULL, &pref_cipher, 1007 s->tls_session_secret_cb_arg)) { 1008 s->session->cipher = pref_cipher ? 1009 pref_cipher : ssl_get_cipher_by_char(s, p + j); 1010 } else { 1011 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 1012 al = SSL_AD_INTERNAL_ERROR; 1013 goto f_err; 1014 } 1015 } 1016#endif /* OPENSSL_NO_TLSEXT */ 1017 1018 if (j != 0 && j == s->session->session_id_length 1019 && memcmp(p, s->session->session_id, j) == 0) { 1020 if (s->sid_ctx_length != s->session->sid_ctx_length 1021 || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) { 1022 /* actually a client application bug */ 1023 al = SSL_AD_ILLEGAL_PARAMETER; 1024 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 1025 SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 1026 goto f_err; 1027 } 1028 s->hit = 1; 1029 } else { 1030 /* 1031 * If we were trying for session-id reuse but the server 1032 * didn't echo the ID, make a new SSL_SESSION. 1033 * In the case of EAP-FAST and PAC, we do not send a session ID, 1034 * so the PAC-based session secret is always preserved. It'll be 1035 * overwritten if the server refuses resumption. 1036 */ 1037 if (s->session->session_id_length > 0) { 1038 if (!ssl_get_new_session(s, 0)) { 1039 goto f_err; 1040 } 1041 } 1042 s->session->session_id_length = j; 1043 memcpy(s->session->session_id, p, j); /* j could be 0 */ 1044 } 1045 p += j; 1046 c = ssl_get_cipher_by_char(s, p); 1047 if (c == NULL) { 1048 /* unknown cipher */ 1049 al = SSL_AD_ILLEGAL_PARAMETER; 1050 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED); 1051 goto f_err; 1052 } 1053 /* Set version disabled mask now we know version */ 1054 if (!SSL_USE_TLS1_2_CIPHERS(s)) 1055 ct->mask_ssl = SSL_TLSV1_2; 1056 else 1057 ct->mask_ssl = 0; 1058 /* 1059 * If it is a disabled cipher we didn't send it in client hello, so 1060 * return an error. 1061 */ 1062 if (c->algorithm_ssl & ct->mask_ssl || 1063 c->algorithm_mkey & ct->mask_k || c->algorithm_auth & ct->mask_a) { 1064 al = SSL_AD_ILLEGAL_PARAMETER; 1065 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED); 1066 goto f_err; 1067 } 1068 p += ssl_put_cipher_by_char(s, NULL, NULL); 1069 1070 sk = ssl_get_ciphers_by_id(s); 1071 i = sk_SSL_CIPHER_find(sk, c); 1072 if (i < 0) { 1073 /* we did not say we would use this cipher */ 1074 al = SSL_AD_ILLEGAL_PARAMETER; 1075 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED); 1076 goto f_err; 1077 } 1078 1079 /* 1080 * Depending on the session caching (internal/external), the cipher 1081 * and/or cipher_id values may not be set. Make sure that cipher_id is 1082 * set and use it for comparison. 1083 */ 1084 if (s->session->cipher) 1085 s->session->cipher_id = s->session->cipher->id; 1086 if (s->hit && (s->session->cipher_id != c->id)) { 1087/* Workaround is now obsolete */ 1088#if 0 1089 if (!(s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG)) 1090#endif 1091 { 1092 al = SSL_AD_ILLEGAL_PARAMETER; 1093 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 1094 SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1095 goto f_err; 1096 } 1097 } 1098 s->s3->tmp.new_cipher = c; 1099 /* 1100 * Don't digest cached records if no sigalgs: we may need them for client 1101 * authentication. 1102 */ 1103 if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s)) 1104 goto f_err; 1105 /* lets get the compression algorithm */ 1106 /* COMPRESSION */ 1107#ifdef OPENSSL_NO_COMP 1108 if (*(p++) != 0) { 1109 al = SSL_AD_ILLEGAL_PARAMETER; 1110 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 1111 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1112 goto f_err; 1113 } 1114 /* 1115 * If compression is disabled we'd better not try to resume a session 1116 * using compression. 1117 */ 1118 if (s->session->compress_meth != 0) { 1119 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION); 1120 goto f_err; 1121 } 1122#else 1123 j = *(p++); 1124 if (s->hit && j != s->session->compress_meth) { 1125 al = SSL_AD_ILLEGAL_PARAMETER; 1126 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 1127 SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED); 1128 goto f_err; 1129 } 1130 if (j == 0) 1131 comp = NULL; 1132 else if (s->options & SSL_OP_NO_COMPRESSION) { 1133 al = SSL_AD_ILLEGAL_PARAMETER; 1134 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED); 1135 goto f_err; 1136 } else 1137 comp = ssl3_comp_find(s->ctx->comp_methods, j); 1138 1139 if ((j != 0) && (comp == NULL)) { 1140 al = SSL_AD_ILLEGAL_PARAMETER; 1141 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, 1142 SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1143 goto f_err; 1144 } else { 1145 s->s3->tmp.new_compression = comp; 1146 } 1147#endif 1148 1149#ifndef OPENSSL_NO_TLSEXT 1150 /* TLS extensions */ 1151 if (!ssl_parse_serverhello_tlsext(s, &p, d, n)) { 1152 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_PARSE_TLSEXT); 1153 goto err; 1154 } 1155#endif 1156 1157 if (p != (d + n)) { 1158 /* wrong packet length */ 1159 al = SSL_AD_DECODE_ERROR; 1160 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH); 1161 goto f_err; 1162 } 1163 1164 return (1); 1165 f_err: 1166 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1167 err: 1168 s->state = SSL_ST_ERR; 1169 return (-1); 1170} 1171 1172int ssl3_get_server_certificate(SSL *s) 1173{ 1174 int al, i, ok, ret = -1; 1175 unsigned long n, nc, llen, l; 1176 X509 *x = NULL; 1177 const unsigned char *q, *p; 1178 unsigned char *d; 1179 STACK_OF(X509) *sk = NULL; 1180 SESS_CERT *sc; 1181 EVP_PKEY *pkey = NULL; 1182 int need_cert = 1; /* VRS: 0=> will allow null cert if auth == 1183 * KRB5 */ 1184 1185 n = s->method->ssl_get_message(s, 1186 SSL3_ST_CR_CERT_A, 1187 SSL3_ST_CR_CERT_B, 1188 -1, s->max_cert_list, &ok); 1189 1190 if (!ok) 1191 return ((int)n); 1192 1193 if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) || 1194 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) && 1195 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE))) { 1196 s->s3->tmp.reuse_message = 1; 1197 return (1); 1198 } 1199 1200 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE) { 1201 al = SSL_AD_UNEXPECTED_MESSAGE; 1202 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_BAD_MESSAGE_TYPE); 1203 goto f_err; 1204 } 1205 p = d = (unsigned char *)s->init_msg; 1206 1207 if ((sk = sk_X509_new_null()) == NULL) { 1208 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE); 1209 goto err; 1210 } 1211 1212 n2l3(p, llen); 1213 if (llen + 3 != n) { 1214 al = SSL_AD_DECODE_ERROR; 1215 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH); 1216 goto f_err; 1217 } 1218 for (nc = 0; nc < llen;) { 1219 if (nc + 3 > llen) { 1220 al = SSL_AD_DECODE_ERROR; 1221 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1222 SSL_R_CERT_LENGTH_MISMATCH); 1223 goto f_err; 1224 } 1225 n2l3(p, l); 1226 if ((l + nc + 3) > llen) { 1227 al = SSL_AD_DECODE_ERROR; 1228 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1229 SSL_R_CERT_LENGTH_MISMATCH); 1230 goto f_err; 1231 } 1232 1233 q = p; 1234 x = d2i_X509(NULL, &q, l); 1235 if (x == NULL) { 1236 al = SSL_AD_BAD_CERTIFICATE; 1237 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_ASN1_LIB); 1238 goto f_err; 1239 } 1240 if (q != (p + l)) { 1241 al = SSL_AD_DECODE_ERROR; 1242 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1243 SSL_R_CERT_LENGTH_MISMATCH); 1244 goto f_err; 1245 } 1246 if (!sk_X509_push(sk, x)) { 1247 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE); 1248 goto err; 1249 } 1250 x = NULL; 1251 nc += l + 3; 1252 p = q; 1253 } 1254 1255 i = ssl_verify_cert_chain(s, sk); 1256 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0) 1257#ifndef OPENSSL_NO_KRB5 1258 && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) && 1259 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)) 1260#endif /* OPENSSL_NO_KRB5 */ 1261 ) { 1262 al = ssl_verify_alarm_type(s->verify_result); 1263 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1264 SSL_R_CERTIFICATE_VERIFY_FAILED); 1265 goto f_err; 1266 } 1267 ERR_clear_error(); /* but we keep s->verify_result */ 1268 1269 sc = ssl_sess_cert_new(); 1270 if (sc == NULL) 1271 goto err; 1272 1273 if (s->session->sess_cert) 1274 ssl_sess_cert_free(s->session->sess_cert); 1275 s->session->sess_cert = sc; 1276 1277 sc->cert_chain = sk; 1278 /* 1279 * Inconsistency alert: cert_chain does include the peer's certificate, 1280 * which we don't include in s3_srvr.c 1281 */ 1282 x = sk_X509_value(sk, 0); 1283 sk = NULL; 1284 /* 1285 * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end 1286 */ 1287 1288 pkey = X509_get_pubkey(x); 1289 1290 /* VRS: allow null cert if auth == KRB5 */ 1291 need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) && 1292 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)) 1293 ? 0 : 1; 1294 1295#ifdef KSSL_DEBUG 1296 fprintf(stderr, "pkey,x = %p, %p\n", pkey, x); 1297 fprintf(stderr, "ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x, pkey)); 1298 fprintf(stderr, "cipher, alg, nc = %s, %lx, %lx, %d\n", 1299 s->s3->tmp.new_cipher->name, 1300 s->s3->tmp.new_cipher->algorithm_mkey, 1301 s->s3->tmp.new_cipher->algorithm_auth, need_cert); 1302#endif /* KSSL_DEBUG */ 1303 1304 if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey))) { 1305 x = NULL; 1306 al = SSL3_AL_FATAL; 1307 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1308 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1309 goto f_err; 1310 } 1311 1312 i = ssl_cert_type(x, pkey); 1313 if (need_cert && i < 0) { 1314 x = NULL; 1315 al = SSL3_AL_FATAL; 1316 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1317 SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1318 goto f_err; 1319 } 1320 1321 if (need_cert) { 1322 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher); 1323 if (exp_idx >= 0 && i != exp_idx) { 1324 x = NULL; 1325 al = SSL_AD_ILLEGAL_PARAMETER; 1326 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, 1327 SSL_R_WRONG_CERTIFICATE_TYPE); 1328 goto f_err; 1329 } 1330 sc->peer_cert_type = i; 1331 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1332 /* 1333 * Why would the following ever happen? We just created sc a couple 1334 * of lines ago. 1335 */ 1336 if (sc->peer_pkeys[i].x509 != NULL) 1337 X509_free(sc->peer_pkeys[i].x509); 1338 sc->peer_pkeys[i].x509 = x; 1339 sc->peer_key = &(sc->peer_pkeys[i]); 1340 1341 if (s->session->peer != NULL) 1342 X509_free(s->session->peer); 1343 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1344 s->session->peer = x; 1345 } else { 1346 sc->peer_cert_type = i; 1347 sc->peer_key = NULL; 1348 1349 if (s->session->peer != NULL) 1350 X509_free(s->session->peer); 1351 s->session->peer = NULL; 1352 } 1353 s->session->verify_result = s->verify_result; 1354 1355 x = NULL; 1356 ret = 1; 1357 if (0) { 1358 f_err: 1359 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1360 err: 1361 s->state = SSL_ST_ERR; 1362 } 1363 1364 EVP_PKEY_free(pkey); 1365 X509_free(x); 1366 sk_X509_pop_free(sk, X509_free); 1367 return (ret); 1368} 1369 1370int ssl3_get_key_exchange(SSL *s) 1371{ 1372#ifndef OPENSSL_NO_RSA 1373 unsigned char *q, md_buf[EVP_MAX_MD_SIZE * 2]; 1374#endif 1375 EVP_MD_CTX md_ctx; 1376 unsigned char *param, *p; 1377 int al, j, ok; 1378 long i, param_len, n, alg_k, alg_a; 1379 EVP_PKEY *pkey = NULL; 1380 const EVP_MD *md = NULL; 1381#ifndef OPENSSL_NO_RSA 1382 RSA *rsa = NULL; 1383#endif 1384#ifndef OPENSSL_NO_DH 1385 DH *dh = NULL; 1386#endif 1387#ifndef OPENSSL_NO_ECDH 1388 EC_KEY *ecdh = NULL; 1389 BN_CTX *bn_ctx = NULL; 1390 EC_POINT *srvr_ecpoint = NULL; 1391 int curve_nid = 0; 1392 int encoded_pt_len = 0; 1393#endif 1394 1395 EVP_MD_CTX_init(&md_ctx); 1396 1397 /* 1398 * use same message size as in ssl3_get_certificate_request() as 1399 * ServerKeyExchange message may be skipped 1400 */ 1401 n = s->method->ssl_get_message(s, 1402 SSL3_ST_CR_KEY_EXCH_A, 1403 SSL3_ST_CR_KEY_EXCH_B, 1404 -1, s->max_cert_list, &ok); 1405 if (!ok) 1406 return ((int)n); 1407 1408 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 1409 1410 if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1411 /* 1412 * Can't skip server key exchange if this is an ephemeral 1413 * ciphersuite. 1414 */ 1415 if (alg_k & (SSL_kDHE | SSL_kECDHE)) { 1416 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); 1417 al = SSL_AD_UNEXPECTED_MESSAGE; 1418 goto f_err; 1419 } 1420#ifndef OPENSSL_NO_PSK 1421 /* 1422 * In plain PSK ciphersuite, ServerKeyExchange can be omitted if no 1423 * identity hint is sent. Set session->sess_cert anyway to avoid 1424 * problems later. 1425 */ 1426 if (alg_k & SSL_kPSK) { 1427 s->session->sess_cert = ssl_sess_cert_new(); 1428 if (s->ctx->psk_identity_hint) 1429 OPENSSL_free(s->ctx->psk_identity_hint); 1430 s->ctx->psk_identity_hint = NULL; 1431 } 1432#endif 1433 s->s3->tmp.reuse_message = 1; 1434 return (1); 1435 } 1436 1437 param = p = (unsigned char *)s->init_msg; 1438 if (s->session->sess_cert != NULL) { 1439#ifndef OPENSSL_NO_RSA 1440 if (s->session->sess_cert->peer_rsa_tmp != NULL) { 1441 RSA_free(s->session->sess_cert->peer_rsa_tmp); 1442 s->session->sess_cert->peer_rsa_tmp = NULL; 1443 } 1444#endif 1445#ifndef OPENSSL_NO_DH 1446 if (s->session->sess_cert->peer_dh_tmp) { 1447 DH_free(s->session->sess_cert->peer_dh_tmp); 1448 s->session->sess_cert->peer_dh_tmp = NULL; 1449 } 1450#endif 1451#ifndef OPENSSL_NO_ECDH 1452 if (s->session->sess_cert->peer_ecdh_tmp) { 1453 EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp); 1454 s->session->sess_cert->peer_ecdh_tmp = NULL; 1455 } 1456#endif 1457 } else { 1458 s->session->sess_cert = ssl_sess_cert_new(); 1459 } 1460 1461 /* Total length of the parameters including the length prefix */ 1462 param_len = 0; 1463 1464 alg_a = s->s3->tmp.new_cipher->algorithm_auth; 1465 1466 al = SSL_AD_DECODE_ERROR; 1467 1468#ifndef OPENSSL_NO_PSK 1469 if (alg_k & SSL_kPSK) { 1470 param_len = 2; 1471 if (param_len > n) { 1472 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1473 goto f_err; 1474 } 1475 n2s(p, i); 1476 1477 /* 1478 * Store PSK identity hint for later use, hint is used in 1479 * ssl3_send_client_key_exchange. Assume that the maximum length of 1480 * a PSK identity hint can be as long as the maximum length of a PSK 1481 * identity. 1482 */ 1483 if (i > PSK_MAX_IDENTITY_LEN) { 1484 al = SSL_AD_HANDSHAKE_FAILURE; 1485 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_DATA_LENGTH_TOO_LONG); 1486 goto f_err; 1487 } 1488 if (i > n - param_len) { 1489 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1490 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH); 1491 goto f_err; 1492 } 1493 param_len += i; 1494 1495 s->session->psk_identity_hint = BUF_strndup((char *)p, i); 1496 if (s->session->psk_identity_hint == NULL) { 1497 al = SSL_AD_HANDSHAKE_FAILURE; 1498 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 1499 goto f_err; 1500 } 1501 1502 p += i; 1503 n -= param_len; 1504 } else 1505#endif /* !OPENSSL_NO_PSK */ 1506#ifndef OPENSSL_NO_SRP 1507 if (alg_k & SSL_kSRP) { 1508 param_len = 2; 1509 if (param_len > n) { 1510 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1511 goto f_err; 1512 } 1513 n2s(p, i); 1514 1515 if (i > n - param_len) { 1516 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_N_LENGTH); 1517 goto f_err; 1518 } 1519 param_len += i; 1520 1521 if (!(s->srp_ctx.N = BN_bin2bn(p, i, NULL))) { 1522 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1523 goto err; 1524 } 1525 p += i; 1526 1527 if (2 > n - param_len) { 1528 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1529 goto f_err; 1530 } 1531 param_len += 2; 1532 1533 n2s(p, i); 1534 1535 if (i > n - param_len) { 1536 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_G_LENGTH); 1537 goto f_err; 1538 } 1539 param_len += i; 1540 1541 if (!(s->srp_ctx.g = BN_bin2bn(p, i, NULL))) { 1542 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1543 goto err; 1544 } 1545 p += i; 1546 1547 if (1 > n - param_len) { 1548 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1549 goto f_err; 1550 } 1551 param_len += 1; 1552 1553 i = (unsigned int)(p[0]); 1554 p++; 1555 1556 if (i > n - param_len) { 1557 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_S_LENGTH); 1558 goto f_err; 1559 } 1560 param_len += i; 1561 1562 if (!(s->srp_ctx.s = BN_bin2bn(p, i, NULL))) { 1563 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1564 goto err; 1565 } 1566 p += i; 1567 1568 if (2 > n - param_len) { 1569 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1570 goto f_err; 1571 } 1572 param_len += 2; 1573 1574 n2s(p, i); 1575 1576 if (i > n - param_len) { 1577 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_B_LENGTH); 1578 goto f_err; 1579 } 1580 param_len += i; 1581 1582 if (!(s->srp_ctx.B = BN_bin2bn(p, i, NULL))) { 1583 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1584 goto err; 1585 } 1586 p += i; 1587 n -= param_len; 1588 1589 if (!srp_verify_server_param(s, &al)) { 1590 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SRP_PARAMETERS); 1591 goto f_err; 1592 } 1593 1594/* We must check if there is a certificate */ 1595# ifndef OPENSSL_NO_RSA 1596 if (alg_a & SSL_aRSA) 1597 pkey = 1598 X509_get_pubkey(s->session-> 1599 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1600# else 1601 if (0) ; 1602# endif 1603# ifndef OPENSSL_NO_DSA 1604 else if (alg_a & SSL_aDSS) 1605 pkey = 1606 X509_get_pubkey(s->session-> 1607 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN]. 1608 x509); 1609# endif 1610 } else 1611#endif /* !OPENSSL_NO_SRP */ 1612#ifndef OPENSSL_NO_RSA 1613 if (alg_k & SSL_kRSA) { 1614 /* Temporary RSA keys only allowed in export ciphersuites */ 1615 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) { 1616 al = SSL_AD_UNEXPECTED_MESSAGE; 1617 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); 1618 goto f_err; 1619 } 1620 if ((rsa = RSA_new()) == NULL) { 1621 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 1622 goto err; 1623 } 1624 1625 param_len = 2; 1626 if (param_len > n) { 1627 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1628 goto f_err; 1629 } 1630 n2s(p, i); 1631 1632 if (i > n - param_len) { 1633 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_MODULUS_LENGTH); 1634 goto f_err; 1635 } 1636 param_len += i; 1637 1638 if (!(rsa->n = BN_bin2bn(p, i, rsa->n))) { 1639 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1640 goto err; 1641 } 1642 p += i; 1643 1644 if (2 > n - param_len) { 1645 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1646 goto f_err; 1647 } 1648 param_len += 2; 1649 1650 n2s(p, i); 1651 1652 if (i > n - param_len) { 1653 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_E_LENGTH); 1654 goto f_err; 1655 } 1656 param_len += i; 1657 1658 if (!(rsa->e = BN_bin2bn(p, i, rsa->e))) { 1659 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1660 goto err; 1661 } 1662 p += i; 1663 n -= param_len; 1664 1665 /* this should be because we are using an export cipher */ 1666 if (alg_a & SSL_aRSA) 1667 pkey = 1668 X509_get_pubkey(s->session-> 1669 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1670 else { 1671 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1672 goto err; 1673 } 1674 1675 if (EVP_PKEY_bits(pkey) <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 1676 al = SSL_AD_UNEXPECTED_MESSAGE; 1677 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); 1678 goto f_err; 1679 } 1680 1681 s->session->sess_cert->peer_rsa_tmp = rsa; 1682 rsa = NULL; 1683 } 1684#else /* OPENSSL_NO_RSA */ 1685 if (0) ; 1686#endif 1687#ifndef OPENSSL_NO_DH 1688 else if (alg_k & SSL_kEDH) { 1689 if ((dh = DH_new()) == NULL) { 1690 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_DH_LIB); 1691 goto err; 1692 } 1693 1694 param_len = 2; 1695 if (param_len > n) { 1696 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1697 goto f_err; 1698 } 1699 n2s(p, i); 1700 1701 if (i > n - param_len) { 1702 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_LENGTH); 1703 goto f_err; 1704 } 1705 param_len += i; 1706 1707 if (!(dh->p = BN_bin2bn(p, i, NULL))) { 1708 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1709 goto err; 1710 } 1711 p += i; 1712 1713 if (BN_is_zero(dh->p)) { 1714 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_P_VALUE); 1715 goto f_err; 1716 } 1717 1718 1719 if (2 > n - param_len) { 1720 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1721 goto f_err; 1722 } 1723 param_len += 2; 1724 1725 n2s(p, i); 1726 1727 if (i > n - param_len) { 1728 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_LENGTH); 1729 goto f_err; 1730 } 1731 param_len += i; 1732 1733 if (!(dh->g = BN_bin2bn(p, i, NULL))) { 1734 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1735 goto err; 1736 } 1737 p += i; 1738 1739 if (BN_is_zero(dh->g)) { 1740 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_G_VALUE); 1741 goto f_err; 1742 } 1743 1744 if (2 > n - param_len) { 1745 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1746 goto f_err; 1747 } 1748 param_len += 2; 1749 1750 n2s(p, i); 1751 1752 if (i > n - param_len) { 1753 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_LENGTH); 1754 goto f_err; 1755 } 1756 param_len += i; 1757 1758 if (!(dh->pub_key = BN_bin2bn(p, i, NULL))) { 1759 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_BN_LIB); 1760 goto err; 1761 } 1762 p += i; 1763 n -= param_len; 1764 1765 if (BN_is_zero(dh->pub_key)) { 1766 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_DH_PUB_KEY_VALUE); 1767 goto f_err; 1768 } 1769 1770# ifndef OPENSSL_NO_RSA 1771 if (alg_a & SSL_aRSA) 1772 pkey = 1773 X509_get_pubkey(s->session-> 1774 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1775# else 1776 if (0) ; 1777# endif 1778# ifndef OPENSSL_NO_DSA 1779 else if (alg_a & SSL_aDSS) 1780 pkey = 1781 X509_get_pubkey(s->session-> 1782 sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN]. 1783 x509); 1784# endif 1785 /* else anonymous DH, so no certificate or pkey. */ 1786 1787 s->session->sess_cert->peer_dh_tmp = dh; 1788 dh = NULL; 1789 } else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd)) { 1790 al = SSL_AD_ILLEGAL_PARAMETER; 1791 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1792 SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER); 1793 goto f_err; 1794 } 1795#endif /* !OPENSSL_NO_DH */ 1796 1797#ifndef OPENSSL_NO_ECDH 1798 else if (alg_k & SSL_kEECDH) { 1799 EC_GROUP *ngroup; 1800 const EC_GROUP *group; 1801 1802 if ((ecdh = EC_KEY_new()) == NULL) { 1803 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 1804 goto err; 1805 } 1806 1807 /* 1808 * Extract elliptic curve parameters and the server's ephemeral ECDH 1809 * public key. Keep accumulating lengths of various components in 1810 * param_len and make sure it never exceeds n. 1811 */ 1812 1813 /* 1814 * XXX: For now we only support named (not generic) curves and the 1815 * ECParameters in this case is just three bytes. We also need one 1816 * byte for the length of the encoded point 1817 */ 1818 param_len = 4; 1819 if (param_len > n) { 1820 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1821 goto f_err; 1822 } 1823 /* 1824 * Check curve is one of our preferences, if not server has sent an 1825 * invalid curve. ECParameters is 3 bytes. 1826 */ 1827 if (!tls1_check_curve(s, p, 3)) { 1828 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_CURVE); 1829 goto f_err; 1830 } 1831 1832 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0) { 1833 al = SSL_AD_INTERNAL_ERROR; 1834 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1835 SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1836 goto f_err; 1837 } 1838 1839 ngroup = EC_GROUP_new_by_curve_name(curve_nid); 1840 if (ngroup == NULL) { 1841 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB); 1842 goto err; 1843 } 1844 if (EC_KEY_set_group(ecdh, ngroup) == 0) { 1845 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EC_LIB); 1846 goto err; 1847 } 1848 EC_GROUP_free(ngroup); 1849 1850 group = EC_KEY_get0_group(ecdh); 1851 1852 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1853 (EC_GROUP_get_degree(group) > 163)) { 1854 al = SSL_AD_EXPORT_RESTRICTION; 1855 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1856 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1857 goto f_err; 1858 } 1859 1860 p += 3; 1861 1862 /* Next, get the encoded ECPoint */ 1863 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) || 1864 ((bn_ctx = BN_CTX_new()) == NULL)) { 1865 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); 1866 goto err; 1867 } 1868 1869 encoded_pt_len = *p; /* length of encoded point */ 1870 p += 1; 1871 1872 if ((encoded_pt_len > n - param_len) || 1873 (EC_POINT_oct2point(group, srvr_ecpoint, 1874 p, encoded_pt_len, bn_ctx) == 0)) { 1875 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_ECPOINT); 1876 goto f_err; 1877 } 1878 param_len += encoded_pt_len; 1879 1880 n -= param_len; 1881 p += encoded_pt_len; 1882 1883 /* 1884 * The ECC/TLS specification does not mention the use of DSA to sign 1885 * ECParameters in the server key exchange message. We do support RSA 1886 * and ECDSA. 1887 */ 1888 if (0) ; 1889# ifndef OPENSSL_NO_RSA 1890 else if (alg_a & SSL_aRSA) 1891 pkey = 1892 X509_get_pubkey(s->session-> 1893 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1894# endif 1895# ifndef OPENSSL_NO_ECDSA 1896 else if (alg_a & SSL_aECDSA) 1897 pkey = 1898 X509_get_pubkey(s->session-> 1899 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 1900# endif 1901 /* else anonymous ECDH, so no certificate or pkey. */ 1902 EC_KEY_set_public_key(ecdh, srvr_ecpoint); 1903 s->session->sess_cert->peer_ecdh_tmp = ecdh; 1904 ecdh = NULL; 1905 BN_CTX_free(bn_ctx); 1906 bn_ctx = NULL; 1907 EC_POINT_free(srvr_ecpoint); 1908 srvr_ecpoint = NULL; 1909 } else if (alg_k) { 1910 al = SSL_AD_UNEXPECTED_MESSAGE; 1911 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE); 1912 goto f_err; 1913 } 1914#endif /* !OPENSSL_NO_ECDH */ 1915 1916 /* p points to the next byte, there are 'n' bytes left */ 1917 1918 /* if it was signed, check the signature */ 1919 if (pkey != NULL) { 1920 if (SSL_USE_SIGALGS(s)) { 1921 int rv; 1922 if (2 > n) { 1923 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1924 goto f_err; 1925 } 1926 rv = tls12_check_peer_sigalg(&md, s, p, pkey); 1927 if (rv == -1) 1928 goto err; 1929 else if (rv == 0) { 1930 goto f_err; 1931 } 1932#ifdef SSL_DEBUG 1933 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); 1934#endif 1935 p += 2; 1936 n -= 2; 1937 } else 1938 md = EVP_sha1(); 1939 1940 if (2 > n) { 1941 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT); 1942 goto f_err; 1943 } 1944 n2s(p, i); 1945 n -= 2; 1946 j = EVP_PKEY_size(pkey); 1947 1948 /* 1949 * Check signature length. If n is 0 then signature is empty 1950 */ 1951 if ((i != n) || (n > j) || (n <= 0)) { 1952 /* wrong packet length */ 1953 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_WRONG_SIGNATURE_LENGTH); 1954 goto f_err; 1955 } 1956#ifndef OPENSSL_NO_RSA 1957 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) { 1958 int num; 1959 unsigned int size; 1960 1961 j = 0; 1962 q = md_buf; 1963 for (num = 2; num > 0; num--) { 1964 EVP_MD_CTX_set_flags(&md_ctx, EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); 1965 if (EVP_DigestInit_ex(&md_ctx, 1966 (num == 2) ? s->ctx->md5 : s->ctx->sha1, 1967 NULL) <= 0 1968 || EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]), 1969 SSL3_RANDOM_SIZE) <= 0 1970 || EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]), 1971 SSL3_RANDOM_SIZE) <= 0 1972 || EVP_DigestUpdate(&md_ctx, param, param_len) <= 0 1973 || EVP_DigestFinal_ex(&md_ctx, q, &size) <= 0) { 1974 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, 1975 ERR_R_INTERNAL_ERROR); 1976 al = SSL_AD_INTERNAL_ERROR; 1977 goto f_err; 1978 } 1979 q += size; 1980 j += size; 1981 } 1982 i = RSA_verify(NID_md5_sha1, md_buf, j, p, n, pkey->pkey.rsa); 1983 if (i < 0) { 1984 al = SSL_AD_DECRYPT_ERROR; 1985 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_RSA_DECRYPT); 1986 goto f_err; 1987 } 1988 if (i == 0) { 1989 /* bad signature */ 1990 al = SSL_AD_DECRYPT_ERROR; 1991 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE); 1992 goto f_err; 1993 } 1994 } else 1995#endif 1996 { 1997 if (EVP_VerifyInit_ex(&md_ctx, md, NULL) <= 0 1998 || EVP_VerifyUpdate(&md_ctx, &(s->s3->client_random[0]), 1999 SSL3_RANDOM_SIZE) <= 0 2000 || EVP_VerifyUpdate(&md_ctx, &(s->s3->server_random[0]), 2001 SSL3_RANDOM_SIZE) <= 0 2002 || EVP_VerifyUpdate(&md_ctx, param, param_len) <= 0) { 2003 al = SSL_AD_INTERNAL_ERROR; 2004 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_EVP_LIB); 2005 goto f_err; 2006 } 2007 if (EVP_VerifyFinal(&md_ctx, p, (int)n, pkey) <= 0) { 2008 /* bad signature */ 2009 al = SSL_AD_DECRYPT_ERROR; 2010 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE); 2011 goto f_err; 2012 } 2013 } 2014 } else { 2015 /* aNULL, aSRP or kPSK do not need public keys */ 2016 if (!(alg_a & (SSL_aNULL | SSL_aSRP)) && !(alg_k & SSL_kPSK)) { 2017 /* Might be wrong key type, check it */ 2018 if (ssl3_check_cert_and_algorithm(s)) 2019 /* Otherwise this shouldn't happen */ 2020 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 2021 goto err; 2022 } 2023 /* still data left over */ 2024 if (n != 0) { 2025 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE); 2026 goto f_err; 2027 } 2028 } 2029 EVP_PKEY_free(pkey); 2030 EVP_MD_CTX_cleanup(&md_ctx); 2031 return (1); 2032 f_err: 2033 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2034 err: 2035 EVP_PKEY_free(pkey); 2036#ifndef OPENSSL_NO_RSA 2037 if (rsa != NULL) 2038 RSA_free(rsa); 2039#endif 2040#ifndef OPENSSL_NO_DH 2041 if (dh != NULL) 2042 DH_free(dh); 2043#endif 2044#ifndef OPENSSL_NO_ECDH 2045 BN_CTX_free(bn_ctx); 2046 EC_POINT_free(srvr_ecpoint); 2047 if (ecdh != NULL) 2048 EC_KEY_free(ecdh); 2049#endif 2050 EVP_MD_CTX_cleanup(&md_ctx); 2051 s->state = SSL_ST_ERR; 2052 return (-1); 2053} 2054 2055int ssl3_get_certificate_request(SSL *s) 2056{ 2057 int ok, ret = 0; 2058 unsigned long n, nc, l; 2059 unsigned int llen, ctype_num, i; 2060 X509_NAME *xn = NULL; 2061 const unsigned char *p, *q; 2062 unsigned char *d; 2063 STACK_OF(X509_NAME) *ca_sk = NULL; 2064 2065 n = s->method->ssl_get_message(s, 2066 SSL3_ST_CR_CERT_REQ_A, 2067 SSL3_ST_CR_CERT_REQ_B, 2068 -1, s->max_cert_list, &ok); 2069 2070 if (!ok) 2071 return ((int)n); 2072 2073 s->s3->tmp.cert_req = 0; 2074 2075 if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE) { 2076 s->s3->tmp.reuse_message = 1; 2077 /* 2078 * If we get here we don't need any cached handshake records as we 2079 * wont be doing client auth. 2080 */ 2081 if (s->s3->handshake_buffer) { 2082 if (!ssl3_digest_cached_records(s)) 2083 goto err; 2084 } 2085 return (1); 2086 } 2087 2088 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 2089 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 2090 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_WRONG_MESSAGE_TYPE); 2091 goto err; 2092 } 2093 2094 /* TLS does not like anon-DH with client cert */ 2095 if (s->version > SSL3_VERSION) { 2096 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) { 2097 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 2098 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, 2099 SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 2100 goto err; 2101 } 2102 } 2103 2104 p = d = (unsigned char *)s->init_msg; 2105 2106 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 2107 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); 2108 goto err; 2109 } 2110 2111 /* get the certificate types */ 2112 ctype_num = *(p++); 2113 if (s->cert->ctypes) { 2114 OPENSSL_free(s->cert->ctypes); 2115 s->cert->ctypes = NULL; 2116 } 2117 if (ctype_num > SSL3_CT_NUMBER) { 2118 /* If we exceed static buffer copy all to cert structure */ 2119 s->cert->ctypes = OPENSSL_malloc(ctype_num); 2120 if (s->cert->ctypes == NULL) { 2121 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); 2122 goto err; 2123 } 2124 memcpy(s->cert->ctypes, p, ctype_num); 2125 s->cert->ctype_num = (size_t)ctype_num; 2126 ctype_num = SSL3_CT_NUMBER; 2127 } 2128 for (i = 0; i < ctype_num; i++) 2129 s->s3->tmp.ctype[i] = p[i]; 2130 p += p[-1]; 2131 if (SSL_USE_SIGALGS(s)) { 2132 n2s(p, llen); 2133 /* 2134 * Check we have enough room for signature algorithms and following 2135 * length value. 2136 */ 2137 if ((unsigned long)(p - d + llen + 2) > n) { 2138 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2139 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, 2140 SSL_R_DATA_LENGTH_TOO_LONG); 2141 goto err; 2142 } 2143 /* Clear certificate digests and validity flags */ 2144 for (i = 0; i < SSL_PKEY_NUM; i++) { 2145 s->cert->pkeys[i].digest = NULL; 2146 s->cert->pkeys[i].valid_flags = 0; 2147 } 2148 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen)) { 2149 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2150 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, 2151 SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2152 goto err; 2153 } 2154 if (!tls1_process_sigalgs(s)) { 2155 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 2156 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); 2157 goto err; 2158 } 2159 p += llen; 2160 } 2161 2162 /* get the CA RDNs */ 2163 n2s(p, llen); 2164#if 0 2165 { 2166 FILE *out; 2167 out = fopen("/tmp/vsign.der", "w"); 2168 fwrite(p, 1, llen, out); 2169 fclose(out); 2170 } 2171#endif 2172 2173 if ((unsigned long)(p - d + llen) != n) { 2174 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2175 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH); 2176 goto err; 2177 } 2178 2179 for (nc = 0; nc < llen;) { 2180 if (nc + 2 > llen) { 2181 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2182 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG); 2183 goto err; 2184 } 2185 n2s(p, l); 2186 if ((l + nc + 2) > llen) { 2187 if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 2188 goto cont; /* netscape bugs */ 2189 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2190 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, SSL_R_CA_DN_TOO_LONG); 2191 goto err; 2192 } 2193 2194 q = p; 2195 2196 if ((xn = d2i_X509_NAME(NULL, &q, l)) == NULL) { 2197 /* If netscape tolerance is on, ignore errors */ 2198 if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG) 2199 goto cont; 2200 else { 2201 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2202 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB); 2203 goto err; 2204 } 2205 } 2206 2207 if (q != (p + l)) { 2208 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2209 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, 2210 SSL_R_CA_DN_LENGTH_MISMATCH); 2211 goto err; 2212 } 2213 if (!sk_X509_NAME_push(ca_sk, xn)) { 2214 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE); 2215 goto err; 2216 } 2217 xn = NULL; 2218 2219 p += l; 2220 nc += l + 2; 2221 } 2222 2223 if (0) { 2224 cont: 2225 ERR_clear_error(); 2226 } 2227 2228 /* we should setup a certificate to return.... */ 2229 s->s3->tmp.cert_req = 1; 2230 s->s3->tmp.ctype_num = ctype_num; 2231 if (s->s3->tmp.ca_names != NULL) 2232 sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free); 2233 s->s3->tmp.ca_names = ca_sk; 2234 ca_sk = NULL; 2235 2236 ret = 1; 2237 goto done; 2238 err: 2239 s->state = SSL_ST_ERR; 2240 done: 2241 X509_NAME_free(xn); 2242 if (ca_sk != NULL) 2243 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 2244 return (ret); 2245} 2246 2247static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b) 2248{ 2249 return (X509_NAME_cmp(*a, *b)); 2250} 2251 2252#ifndef OPENSSL_NO_TLSEXT 2253int ssl3_get_new_session_ticket(SSL *s) 2254{ 2255 int ok, al, ret = 0, ticklen; 2256 long n; 2257 const unsigned char *p; 2258 unsigned char *d; 2259 unsigned long ticket_lifetime_hint; 2260 2261 n = s->method->ssl_get_message(s, 2262 SSL3_ST_CR_SESSION_TICKET_A, 2263 SSL3_ST_CR_SESSION_TICKET_B, 2264 SSL3_MT_NEWSESSION_TICKET, 16384, &ok); 2265 2266 if (!ok) 2267 return ((int)n); 2268 2269 if (n < 6) { 2270 /* need at least ticket_lifetime_hint + ticket length */ 2271 al = SSL_AD_DECODE_ERROR; 2272 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH); 2273 goto f_err; 2274 } 2275 2276 p = d = (unsigned char *)s->init_msg; 2277 2278 n2l(p, ticket_lifetime_hint); 2279 n2s(p, ticklen); 2280 /* ticket_lifetime_hint + ticket_length + ticket */ 2281 if (ticklen + 6 != n) { 2282 al = SSL_AD_DECODE_ERROR; 2283 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH); 2284 goto f_err; 2285 } 2286 2287 /* Server is allowed to change its mind and send an empty ticket. */ 2288 if (ticklen == 0) 2289 return 1; 2290 2291 if (s->session->session_id_length > 0) { 2292 int i = s->session_ctx->session_cache_mode; 2293 SSL_SESSION *new_sess; 2294 /* 2295 * We reused an existing session, so we need to replace it with a new 2296 * one 2297 */ 2298 if (i & SSL_SESS_CACHE_CLIENT) { 2299 /* 2300 * Remove the old session from the cache 2301 */ 2302 if (i & SSL_SESS_CACHE_NO_INTERNAL_STORE) { 2303 if (s->session_ctx->remove_session_cb != NULL) 2304 s->session_ctx->remove_session_cb(s->session_ctx, 2305 s->session); 2306 } else { 2307 /* We carry on if this fails */ 2308 SSL_CTX_remove_session(s->session_ctx, s->session); 2309 } 2310 } 2311 2312 if ((new_sess = ssl_session_dup(s->session, 0)) == 0) { 2313 al = SSL_AD_INTERNAL_ERROR; 2314 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE); 2315 goto f_err; 2316 } 2317 2318 SSL_SESSION_free(s->session); 2319 s->session = new_sess; 2320 } 2321 2322 if (s->session->tlsext_tick) { 2323 OPENSSL_free(s->session->tlsext_tick); 2324 s->session->tlsext_ticklen = 0; 2325 } 2326 s->session->tlsext_tick = OPENSSL_malloc(ticklen); 2327 if (!s->session->tlsext_tick) { 2328 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE); 2329 goto err; 2330 } 2331 memcpy(s->session->tlsext_tick, p, ticklen); 2332 s->session->tlsext_tick_lifetime_hint = ticket_lifetime_hint; 2333 s->session->tlsext_ticklen = ticklen; 2334 /* 2335 * There are two ways to detect a resumed ticket session. One is to set 2336 * an appropriate session ID and then the server must return a match in 2337 * ServerHello. This allows the normal client session ID matching to work 2338 * and we know much earlier that the ticket has been accepted. The 2339 * other way is to set zero length session ID when the ticket is 2340 * presented and rely on the handshake to determine session resumption. 2341 * We choose the former approach because this fits in with assumptions 2342 * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is 2343 * SHA256 is disabled) hash of the ticket. 2344 */ 2345 EVP_Digest(p, ticklen, 2346 s->session->session_id, &s->session->session_id_length, 2347# ifndef OPENSSL_NO_SHA256 2348 EVP_sha256(), NULL); 2349# else 2350 EVP_sha1(), NULL); 2351# endif 2352 ret = 1; 2353 return (ret); 2354 f_err: 2355 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2356 err: 2357 s->state = SSL_ST_ERR; 2358 return (-1); 2359} 2360 2361int ssl3_get_cert_status(SSL *s) 2362{ 2363 int ok, al; 2364 unsigned long resplen, n; 2365 const unsigned char *p; 2366 2367 n = s->method->ssl_get_message(s, 2368 SSL3_ST_CR_CERT_STATUS_A, 2369 SSL3_ST_CR_CERT_STATUS_B, 2370 -1, 16384, &ok); 2371 2372 if (!ok) 2373 return ((int)n); 2374 2375 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_STATUS) { 2376 /* 2377 * The CertificateStatus message is optional even if 2378 * tlsext_status_expected is set 2379 */ 2380 s->s3->tmp.reuse_message = 1; 2381 } else { 2382 if (n < 4) { 2383 /* need at least status type + length */ 2384 al = SSL_AD_DECODE_ERROR; 2385 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH); 2386 goto f_err; 2387 } 2388 p = (unsigned char *)s->init_msg; 2389 if (*p++ != TLSEXT_STATUSTYPE_ocsp) { 2390 al = SSL_AD_DECODE_ERROR; 2391 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE); 2392 goto f_err; 2393 } 2394 n2l3(p, resplen); 2395 if (resplen + 4 != n) { 2396 al = SSL_AD_DECODE_ERROR; 2397 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_LENGTH_MISMATCH); 2398 goto f_err; 2399 } 2400 s->tlsext_ocsp_resp = BUF_memdup(p, resplen); 2401 if (s->tlsext_ocsp_resp == NULL) { 2402 al = SSL_AD_INTERNAL_ERROR; 2403 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE); 2404 goto f_err; 2405 } 2406 s->tlsext_ocsp_resplen = resplen; 2407 } 2408 if (s->ctx->tlsext_status_cb) { 2409 int ret; 2410 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg); 2411 if (ret == 0) { 2412 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 2413 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, SSL_R_INVALID_STATUS_RESPONSE); 2414 goto f_err; 2415 } 2416 if (ret < 0) { 2417 al = SSL_AD_INTERNAL_ERROR; 2418 SSLerr(SSL_F_SSL3_GET_CERT_STATUS, ERR_R_MALLOC_FAILURE); 2419 goto f_err; 2420 } 2421 } 2422 return 1; 2423 f_err: 2424 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2425 s->state = SSL_ST_ERR; 2426 return (-1); 2427} 2428#endif 2429 2430int ssl3_get_server_done(SSL *s) 2431{ 2432 int ok, ret = 0; 2433 long n; 2434 2435 /* Second to last param should be very small, like 0 :-) */ 2436 n = s->method->ssl_get_message(s, 2437 SSL3_ST_CR_SRVR_DONE_A, 2438 SSL3_ST_CR_SRVR_DONE_B, 2439 SSL3_MT_SERVER_DONE, 30, &ok); 2440 2441 if (!ok) 2442 return ((int)n); 2443 if (n > 0) { 2444 /* should contain no data */ 2445 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 2446 SSLerr(SSL_F_SSL3_GET_SERVER_DONE, SSL_R_LENGTH_MISMATCH); 2447 s->state = SSL_ST_ERR; 2448 return -1; 2449 } 2450 ret = 1; 2451 return (ret); 2452} 2453 2454#ifndef OPENSSL_NO_DH 2455static DH *get_server_static_dh_key(SESS_CERT *scert) 2456{ 2457 DH *dh_srvr = NULL; 2458 EVP_PKEY *spkey = NULL; 2459 int idx = scert->peer_cert_type; 2460 2461 if (idx >= 0) 2462 spkey = X509_get_pubkey(scert->peer_pkeys[idx].x509); 2463 if (spkey) { 2464 dh_srvr = EVP_PKEY_get1_DH(spkey); 2465 EVP_PKEY_free(spkey); 2466 } 2467 if (dh_srvr == NULL) 2468 SSLerr(SSL_F_GET_SERVER_STATIC_DH_KEY, ERR_R_INTERNAL_ERROR); 2469 return dh_srvr; 2470} 2471#endif 2472 2473int ssl3_send_client_key_exchange(SSL *s) 2474{ 2475 unsigned char *p; 2476 int n; 2477 unsigned long alg_k; 2478#ifndef OPENSSL_NO_RSA 2479 unsigned char *q; 2480 EVP_PKEY *pkey = NULL; 2481#endif 2482#ifndef OPENSSL_NO_KRB5 2483 KSSL_ERR kssl_err; 2484#endif /* OPENSSL_NO_KRB5 */ 2485#ifndef OPENSSL_NO_ECDH 2486 EC_KEY *clnt_ecdh = NULL; 2487 const EC_POINT *srvr_ecpoint = NULL; 2488 EVP_PKEY *srvr_pub_pkey = NULL; 2489 unsigned char *encodedPoint = NULL; 2490 int encoded_pt_len = 0; 2491 BN_CTX *bn_ctx = NULL; 2492#endif 2493 2494 if (s->state == SSL3_ST_CW_KEY_EXCH_A) { 2495 p = ssl_handshake_start(s); 2496 2497 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 2498 2499 /* Fool emacs indentation */ 2500 if (0) { 2501 } 2502#ifndef OPENSSL_NO_RSA 2503 else if (alg_k & SSL_kRSA) { 2504 RSA *rsa; 2505 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 2506 2507 if (s->session->sess_cert == NULL) { 2508 /* 2509 * We should always have a server certificate with SSL_kRSA. 2510 */ 2511 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2512 ERR_R_INTERNAL_ERROR); 2513 goto err; 2514 } 2515 2516 if (s->session->sess_cert->peer_rsa_tmp != NULL) 2517 rsa = s->session->sess_cert->peer_rsa_tmp; 2518 else { 2519 pkey = 2520 X509_get_pubkey(s->session-> 2521 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC]. 2522 x509); 2523 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) 2524 || (pkey->pkey.rsa == NULL)) { 2525 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2526 ERR_R_INTERNAL_ERROR); 2527 EVP_PKEY_free(pkey); 2528 goto err; 2529 } 2530 rsa = pkey->pkey.rsa; 2531 EVP_PKEY_free(pkey); 2532 } 2533 2534 tmp_buf[0] = s->client_version >> 8; 2535 tmp_buf[1] = s->client_version & 0xff; 2536 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0) 2537 goto err; 2538 2539 s->session->master_key_length = sizeof tmp_buf; 2540 2541 q = p; 2542 /* Fix buf for TLS and beyond */ 2543 if (s->version > SSL3_VERSION) 2544 p += 2; 2545 n = RSA_public_encrypt(sizeof tmp_buf, 2546 tmp_buf, p, rsa, RSA_PKCS1_PADDING); 2547# ifdef PKCS1_CHECK 2548 if (s->options & SSL_OP_PKCS1_CHECK_1) 2549 p[1]++; 2550 if (s->options & SSL_OP_PKCS1_CHECK_2) 2551 tmp_buf[0] = 0x70; 2552# endif 2553 if (n <= 0) { 2554 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2555 SSL_R_BAD_RSA_ENCRYPT); 2556 goto err; 2557 } 2558 2559 /* Fix buf for TLS and beyond */ 2560 if (s->version > SSL3_VERSION) { 2561 s2n(n, q); 2562 n += 2; 2563 } 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 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 2572 } 2573#endif 2574#ifndef OPENSSL_NO_KRB5 2575 else if (alg_k & SSL_kKRB5) { 2576 krb5_error_code krb5rc; 2577 KSSL_CTX *kssl_ctx = s->kssl_ctx; 2578 /* krb5_data krb5_ap_req; */ 2579 krb5_data *enc_ticket; 2580 krb5_data authenticator, *authp = NULL; 2581 EVP_CIPHER_CTX ciph_ctx; 2582 const EVP_CIPHER *enc = NULL; 2583 unsigned char iv[EVP_MAX_IV_LENGTH]; 2584 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH]; 2585 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH]; 2586 int padl, outl = sizeof(epms); 2587 2588 EVP_CIPHER_CTX_init(&ciph_ctx); 2589 2590# ifdef KSSL_DEBUG 2591 fprintf(stderr, "ssl3_send_client_key_exchange(%lx & %lx)\n", 2592 alg_k, SSL_kKRB5); 2593# endif /* KSSL_DEBUG */ 2594 2595 authp = NULL; 2596# ifdef KRB5SENDAUTH 2597 if (KRB5SENDAUTH) 2598 authp = &authenticator; 2599# endif /* KRB5SENDAUTH */ 2600 2601 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err); 2602 enc = kssl_map_enc(kssl_ctx->enctype); 2603 if (enc == NULL) 2604 goto err; 2605# ifdef KSSL_DEBUG 2606 { 2607 fprintf(stderr, "kssl_cget_tkt rtn %d\n", krb5rc); 2608 if (krb5rc && kssl_err.text) 2609 fprintf(stderr, "kssl_cget_tkt kssl_err=%s\n", 2610 kssl_err.text); 2611 } 2612# endif /* KSSL_DEBUG */ 2613 2614 if (krb5rc) { 2615 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2616 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, kssl_err.reason); 2617 goto err; 2618 } 2619 2620 /*- 2621 * 20010406 VRS - Earlier versions used KRB5 AP_REQ 2622 * in place of RFC 2712 KerberosWrapper, as in: 2623 * 2624 * Send ticket (copy to *p, set n = length) 2625 * n = krb5_ap_req.length; 2626 * memcpy(p, krb5_ap_req.data, krb5_ap_req.length); 2627 * if (krb5_ap_req.data) 2628 * kssl_krb5_free_data_contents(NULL,&krb5_ap_req); 2629 * 2630 * Now using real RFC 2712 KerberosWrapper 2631 * (Thanks to Simon Wilkinson <sxw@sxw.org.uk>) 2632 * Note: 2712 "opaque" types are here replaced 2633 * with a 2-byte length followed by the value. 2634 * Example: 2635 * KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms 2636 * Where "xx xx" = length bytes. Shown here with 2637 * optional authenticator omitted. 2638 */ 2639 2640 /* KerberosWrapper.Ticket */ 2641 s2n(enc_ticket->length, p); 2642 memcpy(p, enc_ticket->data, enc_ticket->length); 2643 p += enc_ticket->length; 2644 n = enc_ticket->length + 2; 2645 2646 /* KerberosWrapper.Authenticator */ 2647 if (authp && authp->length) { 2648 s2n(authp->length, p); 2649 memcpy(p, authp->data, authp->length); 2650 p += authp->length; 2651 n += authp->length + 2; 2652 2653 free(authp->data); 2654 authp->data = NULL; 2655 authp->length = 0; 2656 } else { 2657 s2n(0, p); /* null authenticator length */ 2658 n += 2; 2659 } 2660 2661 tmp_buf[0] = s->client_version >> 8; 2662 tmp_buf[1] = s->client_version & 0xff; 2663 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0) 2664 goto err; 2665 2666 /*- 2667 * 20010420 VRS. Tried it this way; failed. 2668 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL); 2669 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx, 2670 * kssl_ctx->length); 2671 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv); 2672 */ 2673 2674 memset(iv, 0, sizeof iv); /* per RFC 1510 */ 2675 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv); 2676 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf, 2677 sizeof tmp_buf); 2678 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl); 2679 outl += padl; 2680 if (outl > (int)sizeof epms) { 2681 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2682 ERR_R_INTERNAL_ERROR); 2683 goto err; 2684 } 2685 EVP_CIPHER_CTX_cleanup(&ciph_ctx); 2686 2687 /* KerberosWrapper.EncryptedPreMasterSecret */ 2688 s2n(outl, p); 2689 memcpy(p, epms, outl); 2690 p += outl; 2691 n += outl + 2; 2692 2693 s->session->master_key_length = 2694 s->method->ssl3_enc->generate_master_secret(s, 2695 s-> 2696 session->master_key, 2697 tmp_buf, 2698 sizeof tmp_buf); 2699 2700 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf); 2701 OPENSSL_cleanse(epms, outl); 2702 } 2703#endif 2704#ifndef OPENSSL_NO_DH 2705 else if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) { 2706 DH *dh_srvr, *dh_clnt; 2707 SESS_CERT *scert = s->session->sess_cert; 2708 2709 if (scert == NULL) { 2710 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 2711 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2712 SSL_R_UNEXPECTED_MESSAGE); 2713 goto err; 2714 } 2715 2716 if (scert->peer_dh_tmp != NULL) { 2717 dh_srvr = scert->peer_dh_tmp; 2718 } else { 2719 dh_srvr = get_server_static_dh_key(scert); 2720 if (dh_srvr == NULL) 2721 goto err; 2722 } 2723 2724 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 2725 /* Use client certificate key */ 2726 EVP_PKEY *clkey = s->cert->key->privatekey; 2727 dh_clnt = NULL; 2728 if (clkey) 2729 dh_clnt = EVP_PKEY_get1_DH(clkey); 2730 if (dh_clnt == NULL) { 2731 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2732 ERR_R_INTERNAL_ERROR); 2733 goto err; 2734 } 2735 } else { 2736 /* generate a new random key */ 2737 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2738 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 2739 goto err; 2740 } 2741 if (!DH_generate_key(dh_clnt)) { 2742 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 2743 DH_free(dh_clnt); 2744 goto err; 2745 } 2746 } 2747 2748 /* 2749 * use the 'p' output buffer for the DH key, but make sure to 2750 * clear it out afterwards 2751 */ 2752 2753 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt); 2754 if (scert->peer_dh_tmp == NULL) 2755 DH_free(dh_srvr); 2756 2757 if (n <= 0) { 2758 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB); 2759 DH_free(dh_clnt); 2760 goto err; 2761 } 2762 2763 /* generate master key from the result */ 2764 s->session->master_key_length = 2765 s->method->ssl3_enc->generate_master_secret(s, 2766 s-> 2767 session->master_key, 2768 p, n); 2769 /* clean up */ 2770 memset(p, 0, n); 2771 2772 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) 2773 n = 0; 2774 else { 2775 /* send off the data */ 2776 n = BN_num_bytes(dh_clnt->pub_key); 2777 s2n(n, p); 2778 BN_bn2bin(dh_clnt->pub_key, p); 2779 n += 2; 2780 } 2781 2782 DH_free(dh_clnt); 2783 } 2784#endif 2785 2786#ifndef OPENSSL_NO_ECDH 2787 else if (alg_k & (SSL_kEECDH | SSL_kECDHr | SSL_kECDHe)) { 2788 const EC_GROUP *srvr_group = NULL; 2789 EC_KEY *tkey; 2790 int ecdh_clnt_cert = 0; 2791 int field_size = 0; 2792 2793 if (s->session->sess_cert == NULL) { 2794 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 2795 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2796 SSL_R_UNEXPECTED_MESSAGE); 2797 goto err; 2798 } 2799 2800 /* 2801 * Did we send out the client's ECDH share for use in premaster 2802 * computation as part of client certificate? If so, set 2803 * ecdh_clnt_cert to 1. 2804 */ 2805 if ((alg_k & (SSL_kECDHr | SSL_kECDHe)) && (s->cert != NULL)) { 2806 /*- 2807 * XXX: For now, we do not support client 2808 * authentication using ECDH certificates. 2809 * To add such support, one needs to add 2810 * code that checks for appropriate 2811 * conditions and sets ecdh_clnt_cert to 1. 2812 * For example, the cert have an ECC 2813 * key on the same curve as the server's 2814 * and the key should be authorized for 2815 * key agreement. 2816 * 2817 * One also needs to add code in ssl3_connect 2818 * to skip sending the certificate verify 2819 * message. 2820 * 2821 * if ((s->cert->key->privatekey != NULL) && 2822 * (s->cert->key->privatekey->type == 2823 * EVP_PKEY_EC) && ...) 2824 * ecdh_clnt_cert = 1; 2825 */ 2826 } 2827 2828 if (s->session->sess_cert->peer_ecdh_tmp != NULL) { 2829 tkey = s->session->sess_cert->peer_ecdh_tmp; 2830 } else { 2831 /* Get the Server Public Key from Cert */ 2832 srvr_pub_pkey = 2833 X509_get_pubkey(s->session-> 2834 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509); 2835 if ((srvr_pub_pkey == NULL) 2836 || (srvr_pub_pkey->type != EVP_PKEY_EC) 2837 || (srvr_pub_pkey->pkey.ec == NULL)) { 2838 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2839 ERR_R_INTERNAL_ERROR); 2840 goto err; 2841 } 2842 2843 tkey = srvr_pub_pkey->pkey.ec; 2844 } 2845 2846 srvr_group = EC_KEY_get0_group(tkey); 2847 srvr_ecpoint = EC_KEY_get0_public_key(tkey); 2848 2849 if ((srvr_group == NULL) || (srvr_ecpoint == NULL)) { 2850 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2851 ERR_R_INTERNAL_ERROR); 2852 goto err; 2853 } 2854 2855 if ((clnt_ecdh = EC_KEY_new()) == NULL) { 2856 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2857 ERR_R_MALLOC_FAILURE); 2858 goto err; 2859 } 2860 2861 if (!EC_KEY_set_group(clnt_ecdh, srvr_group)) { 2862 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); 2863 goto err; 2864 } 2865 if (ecdh_clnt_cert) { 2866 /* 2867 * Reuse key info from our certificate We only need our 2868 * private key to perform the ECDH computation. 2869 */ 2870 const BIGNUM *priv_key; 2871 tkey = s->cert->key->privatekey->pkey.ec; 2872 priv_key = EC_KEY_get0_private_key(tkey); 2873 if (priv_key == NULL) { 2874 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2875 ERR_R_MALLOC_FAILURE); 2876 goto err; 2877 } 2878 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key)) { 2879 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); 2880 goto err; 2881 } 2882 } else { 2883 /* Generate a new ECDH key pair */ 2884 if (!(EC_KEY_generate_key(clnt_ecdh))) { 2885 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2886 ERR_R_ECDH_LIB); 2887 goto err; 2888 } 2889 } 2890 2891 /* 2892 * use the 'p' output buffer for the ECDH key, but make sure to 2893 * clear it out afterwards 2894 */ 2895 2896 field_size = EC_GROUP_get_degree(srvr_group); 2897 if (field_size <= 0) { 2898 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 2899 goto err; 2900 } 2901 n = ECDH_compute_key(p, (field_size + 7) / 8, srvr_ecpoint, 2902 clnt_ecdh, NULL); 2903 if (n <= 0) { 2904 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB); 2905 goto err; 2906 } 2907 2908 /* generate master key from the result */ 2909 s->session->master_key_length = 2910 s->method->ssl3_enc->generate_master_secret(s, 2911 s-> 2912 session->master_key, 2913 p, n); 2914 2915 memset(p, 0, n); /* clean up */ 2916 2917 if (ecdh_clnt_cert) { 2918 /* Send empty client key exch message */ 2919 n = 0; 2920 } else { 2921 /* 2922 * First check the size of encoding and allocate memory 2923 * accordingly. 2924 */ 2925 encoded_pt_len = 2926 EC_POINT_point2oct(srvr_group, 2927 EC_KEY_get0_public_key(clnt_ecdh), 2928 POINT_CONVERSION_UNCOMPRESSED, 2929 NULL, 0, NULL); 2930 2931 encodedPoint = (unsigned char *) 2932 OPENSSL_malloc(encoded_pt_len * sizeof(unsigned char)); 2933 bn_ctx = BN_CTX_new(); 2934 if ((encodedPoint == NULL) || (bn_ctx == NULL)) { 2935 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2936 ERR_R_MALLOC_FAILURE); 2937 goto err; 2938 } 2939 2940 /* Encode the public key */ 2941 n = EC_POINT_point2oct(srvr_group, 2942 EC_KEY_get0_public_key(clnt_ecdh), 2943 POINT_CONVERSION_UNCOMPRESSED, 2944 encodedPoint, encoded_pt_len, bn_ctx); 2945 2946 *p = n; /* length of encoded point */ 2947 /* Encoded point will be copied here */ 2948 p += 1; 2949 /* copy the point */ 2950 memcpy((unsigned char *)p, encodedPoint, n); 2951 /* increment n to account for length field */ 2952 n += 1; 2953 } 2954 2955 /* Free allocated memory */ 2956 BN_CTX_free(bn_ctx); 2957 if (encodedPoint != NULL) 2958 OPENSSL_free(encodedPoint); 2959 if (clnt_ecdh != NULL) 2960 EC_KEY_free(clnt_ecdh); 2961 EVP_PKEY_free(srvr_pub_pkey); 2962 } 2963#endif /* !OPENSSL_NO_ECDH */ 2964 else if (alg_k & SSL_kGOST) { 2965 /* GOST key exchange message creation */ 2966 EVP_PKEY_CTX *pkey_ctx; 2967 X509 *peer_cert; 2968 size_t msglen; 2969 unsigned int md_len; 2970 int keytype; 2971 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2972 EVP_MD_CTX *ukm_hash; 2973 EVP_PKEY *pub_key; 2974 2975 /* 2976 * Get server sertificate PKEY and create ctx from it 2977 */ 2978 peer_cert = 2979 s->session-> 2980 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST01)].x509; 2981 if (!peer_cert) 2982 peer_cert = 2983 s->session-> 2984 sess_cert->peer_pkeys[(keytype = SSL_PKEY_GOST94)].x509; 2985 if (!peer_cert) { 2986 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2987 SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2988 goto err; 2989 } 2990 2991 pkey_ctx = EVP_PKEY_CTX_new(pub_key = 2992 X509_get_pubkey(peer_cert), NULL); 2993 if (pkey_ctx == NULL) { 2994 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 2995 ERR_R_MALLOC_FAILURE); 2996 goto err; 2997 } 2998 /* 2999 * If we have send a certificate, and certificate key 3000 * 3001 * * parameters match those of server certificate, use 3002 * certificate key for key exchange 3003 */ 3004 3005 /* Otherwise, generate ephemeral key pair */ 3006 3007 if (pkey_ctx == NULL 3008 || EVP_PKEY_encrypt_init(pkey_ctx) <= 0 3009 /* Generate session key */ 3010 || RAND_bytes(premaster_secret, 32) <= 0) { 3011 EVP_PKEY_CTX_free(pkey_ctx); 3012 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3013 ERR_R_INTERNAL_ERROR); 3014 goto err; 3015 } 3016 /* 3017 * Compute shared IV and store it in algorithm-specific context 3018 * data 3019 */ 3020 ukm_hash = EVP_MD_CTX_create(); 3021 if (EVP_DigestInit(ukm_hash, 3022 EVP_get_digestbynid(NID_id_GostR3411_94)) <= 0 3023 || EVP_DigestUpdate(ukm_hash, s->s3->client_random, 3024 SSL3_RANDOM_SIZE) <= 0 3025 || EVP_DigestUpdate(ukm_hash, s->s3->server_random, 3026 SSL3_RANDOM_SIZE) <= 0 3027 || EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len) <= 0) { 3028 EVP_MD_CTX_destroy(ukm_hash); 3029 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3030 ERR_R_INTERNAL_ERROR); 3031 goto err; 3032 } 3033 EVP_MD_CTX_destroy(ukm_hash); 3034 if (EVP_PKEY_CTX_ctrl 3035 (pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, EVP_PKEY_CTRL_SET_IV, 8, 3036 shared_ukm) < 0) { 3037 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3038 SSL_R_LIBRARY_BUG); 3039 goto err; 3040 } 3041 /* Make GOST keytransport blob message */ 3042 /* 3043 * Encapsulate it into sequence 3044 */ 3045 *(p++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED; 3046 msglen = 255; 3047 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 32) 3048 <= 0) { 3049 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3050 SSL_R_LIBRARY_BUG); 3051 goto err; 3052 } 3053 if (msglen >= 0x80) { 3054 *(p++) = 0x81; 3055 *(p++) = msglen & 0xff; 3056 n = msglen + 3; 3057 } else { 3058 *(p++) = msglen & 0xff; 3059 n = msglen + 2; 3060 } 3061 memcpy(p, tmp, msglen); 3062 EVP_PKEY_CTX_free(pkey_ctx); 3063 s->session->master_key_length = 3064 s->method->ssl3_enc->generate_master_secret(s, 3065 s-> 3066 session->master_key, 3067 premaster_secret, 3068 32); 3069 EVP_PKEY_free(pub_key); 3070 3071 } 3072#ifndef OPENSSL_NO_SRP 3073 else if (alg_k & SSL_kSRP) { 3074 if (s->srp_ctx.A != NULL) { 3075 /* send off the data */ 3076 n = BN_num_bytes(s->srp_ctx.A); 3077 s2n(n, p); 3078 BN_bn2bin(s->srp_ctx.A, p); 3079 n += 2; 3080 } else { 3081 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3082 ERR_R_INTERNAL_ERROR); 3083 goto err; 3084 } 3085 if (s->session->srp_username != NULL) 3086 OPENSSL_free(s->session->srp_username); 3087 s->session->srp_username = BUF_strdup(s->srp_ctx.login); 3088 if (s->session->srp_username == NULL) { 3089 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3090 ERR_R_MALLOC_FAILURE); 3091 goto err; 3092 } 3093 3094 if ((s->session->master_key_length = 3095 SRP_generate_client_master_secret(s, 3096 s->session->master_key)) < 3097 0) { 3098 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3099 ERR_R_INTERNAL_ERROR); 3100 goto err; 3101 } 3102 } 3103#endif 3104#ifndef OPENSSL_NO_PSK 3105 else if (alg_k & SSL_kPSK) { 3106 /* 3107 * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a 3108 * \0-terminated identity. The last byte is for us for simulating 3109 * strnlen. 3110 */ 3111 char identity[PSK_MAX_IDENTITY_LEN + 2]; 3112 size_t identity_len; 3113 unsigned char *t = NULL; 3114 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN * 2 + 4]; 3115 unsigned int pre_ms_len = 0, psk_len = 0; 3116 int psk_err = 1; 3117 3118 n = 0; 3119 if (s->psk_client_callback == NULL) { 3120 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3121 SSL_R_PSK_NO_CLIENT_CB); 3122 goto err; 3123 } 3124 3125 memset(identity, 0, sizeof(identity)); 3126 psk_len = s->psk_client_callback(s, s->session->psk_identity_hint, 3127 identity, sizeof(identity) - 1, 3128 psk_or_pre_ms, 3129 sizeof(psk_or_pre_ms)); 3130 if (psk_len > PSK_MAX_PSK_LEN) { 3131 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3132 ERR_R_INTERNAL_ERROR); 3133 goto psk_err; 3134 } else if (psk_len == 0) { 3135 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3136 SSL_R_PSK_IDENTITY_NOT_FOUND); 3137 goto psk_err; 3138 } 3139 identity[PSK_MAX_IDENTITY_LEN + 1] = '\0'; 3140 identity_len = strlen(identity); 3141 if (identity_len > PSK_MAX_IDENTITY_LEN) { 3142 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3143 ERR_R_INTERNAL_ERROR); 3144 goto psk_err; 3145 } 3146 /* create PSK pre_master_secret */ 3147 pre_ms_len = 2 + psk_len + 2 + psk_len; 3148 t = psk_or_pre_ms; 3149 memmove(psk_or_pre_ms + psk_len + 4, psk_or_pre_ms, psk_len); 3150 s2n(psk_len, t); 3151 memset(t, 0, psk_len); 3152 t += psk_len; 3153 s2n(psk_len, t); 3154 3155 if (s->session->psk_identity_hint != NULL) 3156 OPENSSL_free(s->session->psk_identity_hint); 3157 s->session->psk_identity_hint = 3158 BUF_strdup(s->ctx->psk_identity_hint); 3159 if (s->ctx->psk_identity_hint != NULL 3160 && s->session->psk_identity_hint == NULL) { 3161 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3162 ERR_R_MALLOC_FAILURE); 3163 goto psk_err; 3164 } 3165 3166 if (s->session->psk_identity != NULL) 3167 OPENSSL_free(s->session->psk_identity); 3168 s->session->psk_identity = BUF_strdup(identity); 3169 if (s->session->psk_identity == NULL) { 3170 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, 3171 ERR_R_MALLOC_FAILURE); 3172 goto psk_err; 3173 } 3174 3175 s->session->master_key_length = 3176 s->method->ssl3_enc->generate_master_secret(s, 3177 s-> 3178 session->master_key, 3179 psk_or_pre_ms, 3180 pre_ms_len); 3181 s2n(identity_len, p); 3182 memcpy(p, identity, identity_len); 3183 n = 2 + identity_len; 3184 psk_err = 0; 3185 psk_err: 3186 OPENSSL_cleanse(identity, sizeof(identity)); 3187 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms)); 3188 if (psk_err != 0) { 3189 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 3190 goto err; 3191 } 3192 } 3193#endif 3194 else { 3195 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 3196 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 3197 goto err; 3198 } 3199 3200 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n); 3201 s->state = SSL3_ST_CW_KEY_EXCH_B; 3202 } 3203 3204 /* SSL3_ST_CW_KEY_EXCH_B */ 3205 return ssl_do_write(s); 3206 err: 3207#ifndef OPENSSL_NO_ECDH 3208 BN_CTX_free(bn_ctx); 3209 if (encodedPoint != NULL) 3210 OPENSSL_free(encodedPoint); 3211 if (clnt_ecdh != NULL) 3212 EC_KEY_free(clnt_ecdh); 3213 EVP_PKEY_free(srvr_pub_pkey); 3214#endif 3215 s->state = SSL_ST_ERR; 3216 return (-1); 3217} 3218 3219int ssl3_send_client_verify(SSL *s) 3220{ 3221 unsigned char *p; 3222 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 3223 EVP_PKEY *pkey; 3224 EVP_PKEY_CTX *pctx = NULL; 3225 EVP_MD_CTX mctx; 3226 unsigned u = 0; 3227 unsigned long n; 3228 int j; 3229 3230 EVP_MD_CTX_init(&mctx); 3231 3232 if (s->state == SSL3_ST_CW_CERT_VRFY_A) { 3233 p = ssl_handshake_start(s); 3234 pkey = s->cert->key->privatekey; 3235/* Create context from key and test if sha1 is allowed as digest */ 3236 pctx = EVP_PKEY_CTX_new(pkey, NULL); 3237 if (pctx == NULL || EVP_PKEY_sign_init(pctx) <= 0) { 3238 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 3239 goto err; 3240 } 3241 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) > 0) { 3242 if (!SSL_USE_SIGALGS(s)) 3243 s->method->ssl3_enc->cert_verify_mac(s, 3244 NID_sha1, 3245 &(data 3246 [MD5_DIGEST_LENGTH])); 3247 } else { 3248 ERR_clear_error(); 3249 } 3250 /* 3251 * For TLS v1.2 send signature algorithm and signature using agreed 3252 * digest and cached handshake records. 3253 */ 3254 if (SSL_USE_SIGALGS(s)) { 3255 long hdatalen = 0; 3256 void *hdata; 3257 const EVP_MD *md = s->cert->key->digest; 3258 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); 3259 if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md)) { 3260 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 3261 goto err; 3262 } 3263 p += 2; 3264#ifdef SSL_DEBUG 3265 fprintf(stderr, "Using TLS 1.2 with client alg %s\n", 3266 EVP_MD_name(md)); 3267#endif 3268 if (!EVP_SignInit_ex(&mctx, md, NULL) 3269 || !EVP_SignUpdate(&mctx, hdata, hdatalen) 3270 || !EVP_SignFinal(&mctx, p + 2, &u, pkey)) { 3271 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_EVP_LIB); 3272 goto err; 3273 } 3274 s2n(u, p); 3275 n = u + 4; 3276 if (!ssl3_digest_cached_records(s)) 3277 goto err; 3278 } else 3279#ifndef OPENSSL_NO_RSA 3280 if (pkey->type == EVP_PKEY_RSA) { 3281 s->method->ssl3_enc->cert_verify_mac(s, NID_md5, &(data[0])); 3282 if (RSA_sign(NID_md5_sha1, data, 3283 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, 3284 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 3285 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB); 3286 goto err; 3287 } 3288 s2n(u, p); 3289 n = u + 2; 3290 } else 3291#endif 3292#ifndef OPENSSL_NO_DSA 3293 if (pkey->type == EVP_PKEY_DSA) { 3294 if (!DSA_sign(pkey->save_type, 3295 &(data[MD5_DIGEST_LENGTH]), 3296 SHA_DIGEST_LENGTH, &(p[2]), 3297 (unsigned int *)&j, pkey->pkey.dsa)) { 3298 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB); 3299 goto err; 3300 } 3301 s2n(j, p); 3302 n = j + 2; 3303 } else 3304#endif 3305#ifndef OPENSSL_NO_ECDSA 3306 if (pkey->type == EVP_PKEY_EC) { 3307 if (!ECDSA_sign(pkey->save_type, 3308 &(data[MD5_DIGEST_LENGTH]), 3309 SHA_DIGEST_LENGTH, &(p[2]), 3310 (unsigned int *)&j, pkey->pkey.ec)) { 3311 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_ECDSA_LIB); 3312 goto err; 3313 } 3314 s2n(j, p); 3315 n = j + 2; 3316 } else 3317#endif 3318 if (pkey->type == NID_id_GostR3410_94 3319 || pkey->type == NID_id_GostR3410_2001) { 3320 unsigned char signbuf[64]; 3321 int i; 3322 size_t sigsize = 64; 3323 s->method->ssl3_enc->cert_verify_mac(s, 3324 NID_id_GostR3411_94, data); 3325 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) { 3326 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 3327 goto err; 3328 } 3329 for (i = 63, j = 0; i >= 0; j++, i--) { 3330 p[2 + j] = signbuf[i]; 3331 } 3332 s2n(j, p); 3333 n = j + 2; 3334 } else { 3335 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR); 3336 goto err; 3337 } 3338 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n); 3339 s->state = SSL3_ST_CW_CERT_VRFY_B; 3340 } 3341 EVP_MD_CTX_cleanup(&mctx); 3342 EVP_PKEY_CTX_free(pctx); 3343 return ssl_do_write(s); 3344 err: 3345 EVP_MD_CTX_cleanup(&mctx); 3346 EVP_PKEY_CTX_free(pctx); 3347 s->state = SSL_ST_ERR; 3348 return (-1); 3349} 3350 3351/* 3352 * Check a certificate can be used for client authentication. Currently check 3353 * cert exists, if we have a suitable digest for TLS 1.2 if static DH client 3354 * certificates can be used and optionally checks suitability for Suite B. 3355 */ 3356static int ssl3_check_client_certificate(SSL *s) 3357{ 3358 unsigned long alg_k; 3359 if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey) 3360 return 0; 3361 /* If no suitable signature algorithm can't use certificate */ 3362 if (SSL_USE_SIGALGS(s) && !s->cert->key->digest) 3363 return 0; 3364 /* 3365 * If strict mode check suitability of chain before using it. This also 3366 * adjusts suite B digest if necessary. 3367 */ 3368 if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT && 3369 !tls1_check_chain(s, NULL, NULL, NULL, -2)) 3370 return 0; 3371 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 3372 /* See if we can use client certificate for fixed DH */ 3373 if (alg_k & (SSL_kDHr | SSL_kDHd)) { 3374 SESS_CERT *scert = s->session->sess_cert; 3375 int i = scert->peer_cert_type; 3376 EVP_PKEY *clkey = NULL, *spkey = NULL; 3377 clkey = s->cert->key->privatekey; 3378 /* If client key not DH assume it can be used */ 3379 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH) 3380 return 1; 3381 if (i >= 0) 3382 spkey = X509_get_pubkey(scert->peer_pkeys[i].x509); 3383 if (spkey) { 3384 /* Compare server and client parameters */ 3385 i = EVP_PKEY_cmp_parameters(clkey, spkey); 3386 EVP_PKEY_free(spkey); 3387 if (i != 1) 3388 return 0; 3389 } 3390 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 3391 } 3392 return 1; 3393} 3394 3395int ssl3_send_client_certificate(SSL *s) 3396{ 3397 X509 *x509 = NULL; 3398 EVP_PKEY *pkey = NULL; 3399 int i; 3400 3401 if (s->state == SSL3_ST_CW_CERT_A) { 3402 /* Let cert callback update client certificates if required */ 3403 if (s->cert->cert_cb) { 3404 i = s->cert->cert_cb(s, s->cert->cert_cb_arg); 3405 if (i < 0) { 3406 s->rwstate = SSL_X509_LOOKUP; 3407 return -1; 3408 } 3409 if (i == 0) { 3410 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 3411 s->state = SSL_ST_ERR; 3412 return 0; 3413 } 3414 s->rwstate = SSL_NOTHING; 3415 } 3416 if (ssl3_check_client_certificate(s)) 3417 s->state = SSL3_ST_CW_CERT_C; 3418 else 3419 s->state = SSL3_ST_CW_CERT_B; 3420 } 3421 3422 /* We need to get a client cert */ 3423 if (s->state == SSL3_ST_CW_CERT_B) { 3424 /* 3425 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP; 3426 * return(-1); We then get retied later 3427 */ 3428 i = ssl_do_client_cert_cb(s, &x509, &pkey); 3429 if (i < 0) { 3430 s->rwstate = SSL_X509_LOOKUP; 3431 return (-1); 3432 } 3433 s->rwstate = SSL_NOTHING; 3434 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 3435 s->state = SSL3_ST_CW_CERT_B; 3436 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey)) 3437 i = 0; 3438 } else if (i == 1) { 3439 i = 0; 3440 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, 3441 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 3442 } 3443 3444 if (x509 != NULL) 3445 X509_free(x509); 3446 if (pkey != NULL) 3447 EVP_PKEY_free(pkey); 3448 if (i && !ssl3_check_client_certificate(s)) 3449 i = 0; 3450 if (i == 0) { 3451 if (s->version == SSL3_VERSION) { 3452 s->s3->tmp.cert_req = 0; 3453 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE); 3454 return (1); 3455 } else { 3456 s->s3->tmp.cert_req = 2; 3457 } 3458 } 3459 3460 /* Ok, we have a cert */ 3461 s->state = SSL3_ST_CW_CERT_C; 3462 } 3463 3464 if (s->state == SSL3_ST_CW_CERT_C) { 3465 s->state = SSL3_ST_CW_CERT_D; 3466 if (!ssl3_output_cert_chain(s, 3467 (s->s3->tmp.cert_req == 3468 2) ? NULL : s->cert->key)) { 3469 SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR); 3470 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR); 3471 s->state = SSL_ST_ERR; 3472 return 0; 3473 } 3474 } 3475 /* SSL3_ST_CW_CERT_D */ 3476 return ssl_do_write(s); 3477} 3478 3479#define has_bits(i,m) (((i)&(m)) == (m)) 3480 3481int ssl3_check_cert_and_algorithm(SSL *s) 3482{ 3483 int i, idx; 3484 long alg_k, alg_a; 3485 EVP_PKEY *pkey = NULL; 3486 int pkey_bits; 3487 SESS_CERT *sc; 3488#ifndef OPENSSL_NO_RSA 3489 RSA *rsa; 3490#endif 3491#ifndef OPENSSL_NO_DH 3492 DH *dh; 3493#endif 3494 int al = SSL_AD_HANDSHAKE_FAILURE; 3495 3496 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 3497 alg_a = s->s3->tmp.new_cipher->algorithm_auth; 3498 3499 /* we don't have a certificate */ 3500 if ((alg_a & (SSL_aNULL | SSL_aKRB5)) || (alg_k & SSL_kPSK)) 3501 return (1); 3502 3503 sc = s->session->sess_cert; 3504 if (sc == NULL) { 3505 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); 3506 goto err; 3507 } 3508#ifndef OPENSSL_NO_RSA 3509 rsa = s->session->sess_cert->peer_rsa_tmp; 3510#endif 3511#ifndef OPENSSL_NO_DH 3512 dh = s->session->sess_cert->peer_dh_tmp; 3513#endif 3514 3515 /* This is the passed certificate */ 3516 3517 idx = sc->peer_cert_type; 3518#ifndef OPENSSL_NO_ECDH 3519 if (idx == SSL_PKEY_ECC) { 3520 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509, s) == 0) { 3521 /* check failed */ 3522 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT); 3523 goto f_err; 3524 } else { 3525 return 1; 3526 } 3527 } else if (alg_a & SSL_aECDSA) { 3528 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3529 SSL_R_MISSING_ECDSA_SIGNING_CERT); 3530 goto f_err; 3531 } else if (alg_k & (SSL_kECDHr | SSL_kECDHe)) { 3532 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_MISSING_ECDH_CERT); 3533 goto f_err; 3534 } 3535#endif 3536 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 3537 pkey_bits = EVP_PKEY_bits(pkey); 3538 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 3539 EVP_PKEY_free(pkey); 3540 3541 /* Check that we have a certificate if we require one */ 3542 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) { 3543 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3544 SSL_R_MISSING_RSA_SIGNING_CERT); 3545 goto f_err; 3546 } 3547#ifndef OPENSSL_NO_DSA 3548 else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) { 3549 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3550 SSL_R_MISSING_DSA_SIGNING_CERT); 3551 goto f_err; 3552 } 3553#endif 3554#ifndef OPENSSL_NO_RSA 3555 if (alg_k & SSL_kRSA) { 3556 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 3557 !has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) { 3558 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3559 SSL_R_MISSING_RSA_ENCRYPTING_CERT); 3560 goto f_err; 3561 } else if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)) { 3562 if (pkey_bits <= SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3563 if (!has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) { 3564 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3565 SSL_R_MISSING_RSA_ENCRYPTING_CERT); 3566 goto f_err; 3567 } 3568 if (rsa != NULL) { 3569 /* server key exchange is not allowed. */ 3570 al = SSL_AD_INTERNAL_ERROR; 3571 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); 3572 goto f_err; 3573 } 3574 } 3575 } 3576 } 3577#endif 3578#ifndef OPENSSL_NO_DH 3579 if ((alg_k & SSL_kEDH) && dh == NULL) { 3580 al = SSL_AD_INTERNAL_ERROR; 3581 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR); 3582 goto f_err; 3583 } 3584 if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) && 3585 !has_bits(i, EVP_PK_DH | EVP_PKS_RSA)) { 3586 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3587 SSL_R_MISSING_DH_RSA_CERT); 3588 goto f_err; 3589 } 3590# ifndef OPENSSL_NO_DSA 3591 if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) && 3592 !has_bits(i, EVP_PK_DH | EVP_PKS_DSA)) { 3593 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3594 SSL_R_MISSING_DH_DSA_CERT); 3595 goto f_err; 3596 } 3597# endif 3598 3599 if (alg_k & (SSL_kDHE | SSL_kDHr | SSL_kDHd)) { 3600 int dh_size; 3601 if (alg_k & SSL_kDHE) { 3602 dh_size = BN_num_bits(dh->p); 3603 } else { 3604 DH *dh_srvr = get_server_static_dh_key(sc); 3605 if (dh_srvr == NULL) 3606 goto f_err; 3607 dh_size = BN_num_bits(dh_srvr->p); 3608 DH_free(dh_srvr); 3609 } 3610 3611 if ((!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 1024) 3612 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && dh_size < 512)) { 3613 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_DH_KEY_TOO_SMALL); 3614 goto f_err; 3615 } 3616 } 3617#endif /* !OPENSSL_NO_DH */ 3618 3619 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 3620 pkey_bits > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3621#ifndef OPENSSL_NO_RSA 3622 if (alg_k & SSL_kRSA) { 3623 if (rsa == NULL) { 3624 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3625 SSL_R_MISSING_EXPORT_TMP_RSA_KEY); 3626 goto f_err; 3627 } else if (BN_num_bits(rsa->n) > 3628 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3629 /* We have a temporary RSA key but it's too large. */ 3630 al = SSL_AD_EXPORT_RESTRICTION; 3631 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3632 SSL_R_MISSING_EXPORT_TMP_RSA_KEY); 3633 goto f_err; 3634 } 3635 } else 3636#endif 3637#ifndef OPENSSL_NO_DH 3638 if (alg_k & SSL_kDHE) { 3639 if (BN_num_bits(dh->p) > 3640 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)) { 3641 /* We have a temporary DH key but it's too large. */ 3642 al = SSL_AD_EXPORT_RESTRICTION; 3643 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3644 SSL_R_MISSING_EXPORT_TMP_DH_KEY); 3645 goto f_err; 3646 } 3647 } else if (alg_k & (SSL_kDHr | SSL_kDHd)) { 3648 /* The cert should have had an export DH key. */ 3649 al = SSL_AD_EXPORT_RESTRICTION; 3650 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3651 SSL_R_MISSING_EXPORT_TMP_DH_KEY); 3652 goto f_err; 3653 } else 3654#endif 3655 { 3656 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, 3657 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 3658 goto f_err; 3659 } 3660 } 3661 return (1); 3662 f_err: 3663 ssl3_send_alert(s, SSL3_AL_FATAL, al); 3664 err: 3665 return (0); 3666} 3667 3668#ifndef OPENSSL_NO_TLSEXT 3669/* 3670 * Normally, we can tell if the server is resuming the session from 3671 * the session ID. EAP-FAST (RFC 4851), however, relies on the next server 3672 * message after the ServerHello to determine if the server is resuming. 3673 * Therefore, we allow EAP-FAST to peek ahead. 3674 * ssl3_check_finished returns 1 if we are resuming from an external 3675 * pre-shared secret, we have a "ticket" and the next server handshake message 3676 * is Finished; and 0 otherwise. It returns -1 upon an error. 3677 */ 3678static int ssl3_check_finished(SSL *s) 3679{ 3680 int ok = 0; 3681 3682 if (s->version < TLS1_VERSION || !s->tls_session_secret_cb || 3683 !s->session->tlsext_tick) 3684 return 0; 3685 3686 /* Need to permit this temporarily, in case the next message is Finished. */ 3687 s->s3->flags |= SSL3_FLAGS_CCS_OK; 3688 /* 3689 * This function is called when we might get a Certificate message instead, 3690 * so permit appropriate message length. 3691 * We ignore the return value as we're only interested in the message type 3692 * and not its length. 3693 */ 3694 s->method->ssl_get_message(s, 3695 SSL3_ST_CR_CERT_A, 3696 SSL3_ST_CR_CERT_B, 3697 -1, s->max_cert_list, &ok); 3698 s->s3->flags &= ~SSL3_FLAGS_CCS_OK; 3699 3700 if (!ok) 3701 return -1; 3702 3703 s->s3->tmp.reuse_message = 1; 3704 3705 if (s->s3->tmp.message_type == SSL3_MT_FINISHED) 3706 return 1; 3707 3708 /* If we're not done, then the CCS arrived early and we should bail. */ 3709 if (s->s3->change_cipher_spec) { 3710 SSLerr(SSL_F_SSL3_CHECK_FINISHED, SSL_R_CCS_RECEIVED_EARLY); 3711 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 3712 return -1; 3713 } 3714 3715 return 0; 3716} 3717 3718# ifndef OPENSSL_NO_NEXTPROTONEG 3719int ssl3_send_next_proto(SSL *s) 3720{ 3721 unsigned int len, padding_len; 3722 unsigned char *d; 3723 3724 if (s->state == SSL3_ST_CW_NEXT_PROTO_A) { 3725 len = s->next_proto_negotiated_len; 3726 padding_len = 32 - ((len + 2) % 32); 3727 d = (unsigned char *)s->init_buf->data; 3728 d[4] = len; 3729 memcpy(d + 5, s->next_proto_negotiated, len); 3730 d[5 + len] = padding_len; 3731 memset(d + 6 + len, 0, padding_len); 3732 *(d++) = SSL3_MT_NEXT_PROTO; 3733 l2n3(2 + len + padding_len, d); 3734 s->state = SSL3_ST_CW_NEXT_PROTO_B; 3735 s->init_num = 4 + 2 + len + padding_len; 3736 s->init_off = 0; 3737 } 3738 3739 return ssl3_do_write(s, SSL3_RT_HANDSHAKE); 3740} 3741#endif /* !OPENSSL_NO_NEXTPROTONEG */ 3742#endif /* !OPENSSL_NO_TLSEXT */ 3743 3744int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 3745{ 3746 int i = 0; 3747#ifndef OPENSSL_NO_ENGINE 3748 if (s->ctx->client_cert_engine) { 3749 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s, 3750 SSL_get_client_CA_list(s), 3751 px509, ppkey, NULL, NULL, NULL); 3752 if (i != 0) 3753 return i; 3754 } 3755#endif 3756 if (s->ctx->client_cert_cb) 3757 i = s->ctx->client_cert_cb(s, px509, ppkey); 3758 return i; 3759} 3760