1 /* $OpenBSD: ssl_clnt.c,v 1.34 2018/09/05 16:58:59 jsing Exp $ */ 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 <limits.h> 152 #include <stdint.h> 153 #include <stdio.h> 154 155 #include "ssl_locl.h" 156 157 #include <openssl/bn.h> 158 #include <openssl/buffer.h> 159 #include <openssl/curve25519.h> 160 #include <openssl/dh.h> 161 #include <openssl/evp.h> 162 #include <openssl/md5.h> 163 #include <openssl/objects.h> 164 165 #ifndef OPENSSL_NO_ENGINE 166 #include <openssl/engine.h> 167 #endif 168 #ifndef OPENSSL_NO_GOST 169 #include <openssl/gost.h> 170 #endif 171 172 #include "bytestring.h" 173 #include "ssl_tlsext.h" 174 175 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 176 177 int 178 ssl3_connect(SSL *s) 179 { 180 void (*cb)(const SSL *ssl, int type, int val) = NULL; 181 int ret = -1; 182 int new_state, state, skip = 0; 183 184 ERR_clear_error(); 185 errno = 0; 186 187 if (s->internal->info_callback != NULL) 188 cb = s->internal->info_callback; 189 else if (s->ctx->internal->info_callback != NULL) 190 cb = s->ctx->internal->info_callback; 191 192 s->internal->in_handshake++; 193 if (!SSL_in_init(s) || SSL_in_before(s)) 194 SSL_clear(s); 195 196 for (;;) { 197 state = S3I(s)->hs.state; 198 199 switch (S3I(s)->hs.state) { 200 case SSL_ST_RENEGOTIATE: 201 s->internal->renegotiate = 1; 202 S3I(s)->hs.state = SSL_ST_CONNECT; 203 s->ctx->internal->stats.sess_connect_renegotiate++; 204 /* break */ 205 case SSL_ST_BEFORE: 206 case SSL_ST_CONNECT: 207 case SSL_ST_BEFORE|SSL_ST_CONNECT: 208 case SSL_ST_OK|SSL_ST_CONNECT: 209 210 s->server = 0; 211 if (cb != NULL) 212 cb(s, SSL_CB_HANDSHAKE_START, 1); 213 214 if (SSL_IS_DTLS(s)) { 215 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { 216 SSLerror(s, ERR_R_INTERNAL_ERROR); 217 ret = -1; 218 goto end; 219 } 220 } else { 221 if ((s->version & 0xff00) != 0x0300) { 222 SSLerror(s, ERR_R_INTERNAL_ERROR); 223 ret = -1; 224 goto end; 225 } 226 } 227 228 /* s->version=SSL3_VERSION; */ 229 s->internal->type = SSL_ST_CONNECT; 230 231 if (!ssl3_setup_init_buffer(s)) { 232 ret = -1; 233 goto end; 234 } 235 if (!ssl3_setup_buffers(s)) { 236 ret = -1; 237 goto end; 238 } 239 if (!ssl_init_wbio_buffer(s, 0)) { 240 ret = -1; 241 goto end; 242 } 243 244 /* don't push the buffering BIO quite yet */ 245 246 if (!SSL_IS_DTLS(s)) { 247 if (!tls1_init_finished_mac(s)) { 248 ret = -1; 249 goto end; 250 } 251 } 252 253 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 254 s->ctx->internal->stats.sess_connect++; 255 s->internal->init_num = 0; 256 257 if (SSL_IS_DTLS(s)) { 258 /* mark client_random uninitialized */ 259 memset(s->s3->client_random, 0, 260 sizeof(s->s3->client_random)); 261 D1I(s)->send_cookie = 0; 262 s->internal->hit = 0; 263 } 264 break; 265 266 case SSL3_ST_CW_CLNT_HELLO_A: 267 case SSL3_ST_CW_CLNT_HELLO_B: 268 s->internal->shutdown = 0; 269 270 if (SSL_IS_DTLS(s)) { 271 /* every DTLS ClientHello resets Finished MAC */ 272 if (!tls1_init_finished_mac(s)) { 273 ret = -1; 274 goto end; 275 } 276 277 dtls1_start_timer(s); 278 } 279 280 ret = ssl3_send_client_hello(s); 281 if (ret <= 0) 282 goto end; 283 284 if (SSL_IS_DTLS(s) && D1I(s)->send_cookie) { 285 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 286 S3I(s)->hs.next_state = SSL3_ST_CR_SRVR_HELLO_A; 287 } else 288 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 289 290 s->internal->init_num = 0; 291 292 /* turn on buffering for the next lot of output */ 293 if (s->bbio != s->wbio) 294 s->wbio = BIO_push(s->bbio, s->wbio); 295 296 break; 297 298 case SSL3_ST_CR_SRVR_HELLO_A: 299 case SSL3_ST_CR_SRVR_HELLO_B: 300 ret = ssl3_get_server_hello(s); 301 if (ret <= 0) 302 goto end; 303 304 if (s->internal->hit) { 305 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 306 if (!SSL_IS_DTLS(s)) { 307 if (s->internal->tlsext_ticket_expected) { 308 /* receive renewed session ticket */ 309 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 310 } 311 } 312 } else if (SSL_IS_DTLS(s)) { 313 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 314 } else { 315 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 316 } 317 s->internal->init_num = 0; 318 break; 319 320 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 321 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 322 ret = dtls1_get_hello_verify(s); 323 if (ret <= 0) 324 goto end; 325 dtls1_stop_timer(s); 326 if (D1I(s)->send_cookie) /* start again, with a cookie */ 327 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 328 else 329 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 330 s->internal->init_num = 0; 331 break; 332 333 case SSL3_ST_CR_CERT_A: 334 case SSL3_ST_CR_CERT_B: 335 ret = ssl3_check_finished(s); 336 if (ret <= 0) 337 goto end; 338 if (ret == 2) { 339 s->internal->hit = 1; 340 if (s->internal->tlsext_ticket_expected) 341 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 342 else 343 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 344 s->internal->init_num = 0; 345 break; 346 } 347 /* Check if it is anon DH/ECDH. */ 348 if (!(S3I(s)->hs.new_cipher->algorithm_auth & 349 SSL_aNULL)) { 350 ret = ssl3_get_server_certificate(s); 351 if (ret <= 0) 352 goto end; 353 if (s->internal->tlsext_status_expected) 354 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A; 355 else 356 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 357 } else { 358 skip = 1; 359 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 360 } 361 s->internal->init_num = 0; 362 break; 363 364 case SSL3_ST_CR_KEY_EXCH_A: 365 case SSL3_ST_CR_KEY_EXCH_B: 366 ret = ssl3_get_server_key_exchange(s); 367 if (ret <= 0) 368 goto end; 369 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A; 370 s->internal->init_num = 0; 371 372 /* 373 * At this point we check that we have the 374 * required stuff from the server. 375 */ 376 if (!ssl3_check_cert_and_algorithm(s)) { 377 ret = -1; 378 goto end; 379 } 380 break; 381 382 case SSL3_ST_CR_CERT_REQ_A: 383 case SSL3_ST_CR_CERT_REQ_B: 384 ret = ssl3_get_certificate_request(s); 385 if (ret <= 0) 386 goto end; 387 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A; 388 s->internal->init_num = 0; 389 break; 390 391 case SSL3_ST_CR_SRVR_DONE_A: 392 case SSL3_ST_CR_SRVR_DONE_B: 393 ret = ssl3_get_server_done(s); 394 if (ret <= 0) 395 goto end; 396 if (SSL_IS_DTLS(s)) 397 dtls1_stop_timer(s); 398 if (S3I(s)->tmp.cert_req) 399 S3I(s)->hs.state = SSL3_ST_CW_CERT_A; 400 else 401 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 402 s->internal->init_num = 0; 403 404 break; 405 406 case SSL3_ST_CW_CERT_A: 407 case SSL3_ST_CW_CERT_B: 408 case SSL3_ST_CW_CERT_C: 409 case SSL3_ST_CW_CERT_D: 410 if (SSL_IS_DTLS(s)) 411 dtls1_start_timer(s); 412 ret = ssl3_send_client_certificate(s); 413 if (ret <= 0) 414 goto end; 415 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 416 s->internal->init_num = 0; 417 break; 418 419 case SSL3_ST_CW_KEY_EXCH_A: 420 case SSL3_ST_CW_KEY_EXCH_B: 421 if (SSL_IS_DTLS(s)) 422 dtls1_start_timer(s); 423 ret = ssl3_send_client_key_exchange(s); 424 if (ret <= 0) 425 goto end; 426 /* 427 * EAY EAY EAY need to check for DH fix cert 428 * sent back 429 */ 430 /* 431 * For TLS, cert_req is set to 2, so a cert chain 432 * of nothing is sent, but no verify packet is sent 433 */ 434 /* 435 * XXX: For now, we do not support client 436 * authentication in ECDH cipher suites with 437 * ECDH (rather than ECDSA) certificates. 438 * We need to skip the certificate verify 439 * message when client's ECDH public key is sent 440 * inside the client certificate. 441 */ 442 if (S3I(s)->tmp.cert_req == 1) { 443 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A; 444 } else { 445 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 446 S3I(s)->change_cipher_spec = 0; 447 } 448 if (!SSL_IS_DTLS(s)) { 449 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 450 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 451 S3I(s)->change_cipher_spec = 0; 452 } 453 } 454 455 s->internal->init_num = 0; 456 break; 457 458 case SSL3_ST_CW_CERT_VRFY_A: 459 case SSL3_ST_CW_CERT_VRFY_B: 460 if (SSL_IS_DTLS(s)) 461 dtls1_start_timer(s); 462 ret = ssl3_send_client_verify(s); 463 if (ret <= 0) 464 goto end; 465 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 466 s->internal->init_num = 0; 467 S3I(s)->change_cipher_spec = 0; 468 break; 469 470 case SSL3_ST_CW_CHANGE_A: 471 case SSL3_ST_CW_CHANGE_B: 472 if (SSL_IS_DTLS(s) && !s->internal->hit) 473 dtls1_start_timer(s); 474 ret = ssl3_send_change_cipher_spec(s, 475 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 476 if (ret <= 0) 477 goto end; 478 479 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A; 480 s->internal->init_num = 0; 481 482 s->session->cipher = S3I(s)->hs.new_cipher; 483 if (!tls1_setup_key_block(s)) { 484 ret = -1; 485 goto end; 486 } 487 488 if (!tls1_change_cipher_state(s, 489 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 490 ret = -1; 491 goto end; 492 } 493 494 if (SSL_IS_DTLS(s)) 495 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 496 497 break; 498 499 case SSL3_ST_CW_FINISHED_A: 500 case SSL3_ST_CW_FINISHED_B: 501 if (SSL_IS_DTLS(s) && !s->internal->hit) 502 dtls1_start_timer(s); 503 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 504 SSL3_ST_CW_FINISHED_B, TLS_MD_CLIENT_FINISH_CONST, 505 TLS_MD_CLIENT_FINISH_CONST_SIZE); 506 if (ret <= 0) 507 goto end; 508 if (!SSL_IS_DTLS(s)) 509 s->s3->flags |= SSL3_FLAGS_CCS_OK; 510 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 511 512 /* clear flags */ 513 if (s->internal->hit) { 514 S3I(s)->hs.next_state = SSL_ST_OK; 515 } else { 516 /* Allow NewSessionTicket if ticket expected */ 517 if (s->internal->tlsext_ticket_expected) 518 S3I(s)->hs.next_state = 519 SSL3_ST_CR_SESSION_TICKET_A; 520 else 521 S3I(s)->hs.next_state = 522 SSL3_ST_CR_FINISHED_A; 523 } 524 s->internal->init_num = 0; 525 break; 526 527 case SSL3_ST_CR_SESSION_TICKET_A: 528 case SSL3_ST_CR_SESSION_TICKET_B: 529 ret = ssl3_get_new_session_ticket(s); 530 if (ret <= 0) 531 goto end; 532 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 533 s->internal->init_num = 0; 534 break; 535 536 case SSL3_ST_CR_CERT_STATUS_A: 537 case SSL3_ST_CR_CERT_STATUS_B: 538 ret = ssl3_get_cert_status(s); 539 if (ret <= 0) 540 goto end; 541 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 542 s->internal->init_num = 0; 543 break; 544 545 case SSL3_ST_CR_FINISHED_A: 546 case SSL3_ST_CR_FINISHED_B: 547 if (SSL_IS_DTLS(s)) 548 D1I(s)->change_cipher_spec_ok = 1; 549 else 550 s->s3->flags |= SSL3_FLAGS_CCS_OK; 551 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 552 SSL3_ST_CR_FINISHED_B); 553 if (ret <= 0) 554 goto end; 555 if (SSL_IS_DTLS(s)) 556 dtls1_stop_timer(s); 557 558 if (s->internal->hit) 559 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 560 else 561 S3I(s)->hs.state = SSL_ST_OK; 562 s->internal->init_num = 0; 563 break; 564 565 case SSL3_ST_CW_FLUSH: 566 s->internal->rwstate = SSL_WRITING; 567 if (BIO_flush(s->wbio) <= 0) { 568 if (SSL_IS_DTLS(s)) { 569 /* If the write error was fatal, stop trying */ 570 if (!BIO_should_retry(s->wbio)) { 571 s->internal->rwstate = SSL_NOTHING; 572 S3I(s)->hs.state = S3I(s)->hs.next_state; 573 } 574 } 575 ret = -1; 576 goto end; 577 } 578 s->internal->rwstate = SSL_NOTHING; 579 S3I(s)->hs.state = S3I(s)->hs.next_state; 580 break; 581 582 case SSL_ST_OK: 583 /* clean a few things up */ 584 tls1_cleanup_key_block(s); 585 586 if (!SSL_IS_DTLS(s)) { 587 BUF_MEM_free(s->internal->init_buf); 588 s->internal->init_buf = NULL; 589 } 590 591 ssl_free_wbio_buffer(s); 592 593 s->internal->init_num = 0; 594 s->internal->renegotiate = 0; 595 s->internal->new_session = 0; 596 597 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 598 if (s->internal->hit) 599 s->ctx->internal->stats.sess_hit++; 600 601 ret = 1; 602 /* s->server=0; */ 603 s->internal->handshake_func = ssl3_connect; 604 s->ctx->internal->stats.sess_connect_good++; 605 606 if (cb != NULL) 607 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 608 609 if (SSL_IS_DTLS(s)) { 610 /* done with handshaking */ 611 D1I(s)->handshake_read_seq = 0; 612 D1I(s)->next_handshake_write_seq = 0; 613 } 614 615 goto end; 616 /* break; */ 617 618 default: 619 SSLerror(s, SSL_R_UNKNOWN_STATE); 620 ret = -1; 621 goto end; 622 /* break; */ 623 } 624 625 /* did we do anything */ 626 if (!S3I(s)->tmp.reuse_message && !skip) { 627 if (s->internal->debug) { 628 if ((ret = BIO_flush(s->wbio)) <= 0) 629 goto end; 630 } 631 632 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 633 new_state = S3I(s)->hs.state; 634 S3I(s)->hs.state = state; 635 cb(s, SSL_CB_CONNECT_LOOP, 1); 636 S3I(s)->hs.state = new_state; 637 } 638 } 639 skip = 0; 640 } 641 642 end: 643 s->internal->in_handshake--; 644 if (cb != NULL) 645 cb(s, SSL_CB_CONNECT_EXIT, ret); 646 647 return (ret); 648 } 649 650 int 651 ssl3_send_client_hello(SSL *s) 652 { 653 CBB cbb, client_hello, session_id, cookie, cipher_suites; 654 CBB compression_methods; 655 uint16_t max_version; 656 size_t sl; 657 658 memset(&cbb, 0, sizeof(cbb)); 659 660 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 661 SSL_SESSION *sess = s->session; 662 663 if (ssl_supported_version_range(s, NULL, &max_version) != 1) { 664 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 665 return (-1); 666 } 667 s->client_version = s->version = max_version; 668 669 if (sess == NULL || 670 sess->ssl_version != s->version || 671 (!sess->session_id_length && !sess->tlsext_tick) || 672 sess->internal->not_resumable) { 673 if (!ssl_get_new_session(s, 0)) 674 goto err; 675 } 676 /* else use the pre-loaded session */ 677 678 /* 679 * If a DTLS ClientHello message is being resent after a 680 * HelloVerifyRequest, we must retain the original client 681 * random value. 682 */ 683 if (!SSL_IS_DTLS(s) || D1I(s)->send_cookie == 0) 684 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 685 686 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 687 SSL3_MT_CLIENT_HELLO)) 688 goto err; 689 690 /* 691 * Version indicates the negotiated version: for example from 692 * an SSLv2/v3 compatible client hello). The client_version 693 * field is the maximum version we permit and it is also 694 * used in RSA encrypted premaster secrets. Some servers can 695 * choke if we initially report a higher version then 696 * renegotiate to a lower one in the premaster secret. This 697 * didn't happen with TLS 1.0 as most servers supported it 698 * but it can with TLS 1.1 or later if the server only supports 699 * 1.0. 700 * 701 * Possible scenario with previous logic: 702 * 1. Client hello indicates TLS 1.2 703 * 2. Server hello says TLS 1.0 704 * 3. RSA encrypted premaster secret uses 1.2. 705 * 4. Handhaked proceeds using TLS 1.0. 706 * 5. Server sends hello request to renegotiate. 707 * 6. Client hello indicates TLS v1.0 as we now 708 * know that is maximum server supports. 709 * 7. Server chokes on RSA encrypted premaster secret 710 * containing version 1.0. 711 * 712 * For interoperability it should be OK to always use the 713 * maximum version we support in client hello and then rely 714 * on the checking of version to ensure the servers isn't 715 * being inconsistent: for example initially negotiating with 716 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 717 * client_version in client hello and not resetting it to 718 * the negotiated version. 719 */ 720 if (!CBB_add_u16(&client_hello, s->client_version)) 721 goto err; 722 723 /* Random stuff */ 724 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 725 sizeof(s->s3->client_random))) 726 goto err; 727 728 /* Session ID */ 729 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 730 goto err; 731 if (!s->internal->new_session && 732 s->session->session_id_length > 0) { 733 sl = s->session->session_id_length; 734 if (sl > sizeof(s->session->session_id)) { 735 SSLerror(s, ERR_R_INTERNAL_ERROR); 736 goto err; 737 } 738 if (!CBB_add_bytes(&session_id, 739 s->session->session_id, sl)) 740 goto err; 741 } 742 743 /* DTLS Cookie. */ 744 if (SSL_IS_DTLS(s)) { 745 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 746 SSLerror(s, ERR_R_INTERNAL_ERROR); 747 goto err; 748 } 749 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 750 goto err; 751 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, 752 D1I(s)->cookie_len)) 753 goto err; 754 } 755 756 /* Ciphers supported */ 757 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 758 return 0; 759 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 760 &cipher_suites)) { 761 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 762 goto err; 763 } 764 765 /* Add in compression methods (null) */ 766 if (!CBB_add_u8_length_prefixed(&client_hello, 767 &compression_methods)) 768 goto err; 769 if (!CBB_add_u8(&compression_methods, 0)) 770 goto err; 771 772 /* TLS extensions */ 773 if (!tlsext_clienthello_build(s, &client_hello)) { 774 SSLerror(s, ERR_R_INTERNAL_ERROR); 775 goto err; 776 } 777 778 if (!ssl3_handshake_msg_finish(s, &cbb)) 779 goto err; 780 781 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 782 } 783 784 /* SSL3_ST_CW_CLNT_HELLO_B */ 785 return (ssl3_handshake_write(s)); 786 787 err: 788 CBB_cleanup(&cbb); 789 790 return (-1); 791 } 792 793 int 794 ssl3_get_server_hello(SSL *s) 795 { 796 CBS cbs, server_random, session_id; 797 uint16_t server_version, cipher_suite; 798 uint16_t min_version, max_version; 799 uint8_t compression_method; 800 STACK_OF(SSL_CIPHER) *sk; 801 const SSL_CIPHER *cipher; 802 const SSL_METHOD *method; 803 unsigned long alg_k; 804 size_t outlen; 805 int i, al, ok; 806 long n; 807 808 s->internal->first_packet = 1; 809 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 810 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 811 if (!ok) 812 return ((int)n); 813 s->internal->first_packet = 0; 814 815 if (n < 0) 816 goto truncated; 817 818 CBS_init(&cbs, s->internal->init_msg, n); 819 820 if (SSL_IS_DTLS(s)) { 821 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 822 if (D1I(s)->send_cookie == 0) { 823 S3I(s)->tmp.reuse_message = 1; 824 return (1); 825 } else { 826 /* Already sent a cookie. */ 827 al = SSL_AD_UNEXPECTED_MESSAGE; 828 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 829 goto f_err; 830 } 831 } 832 } 833 834 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) { 835 al = SSL_AD_UNEXPECTED_MESSAGE; 836 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 837 goto f_err; 838 } 839 840 if (!CBS_get_u16(&cbs, &server_version)) 841 goto truncated; 842 843 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) { 844 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 845 goto err; 846 } 847 848 if (server_version < min_version || server_version > max_version) { 849 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 850 s->version = (s->version & 0xff00) | (server_version & 0xff); 851 al = SSL_AD_PROTOCOL_VERSION; 852 goto f_err; 853 } 854 s->version = server_version; 855 856 if ((method = tls1_get_client_method(server_version)) == NULL) 857 method = dtls1_get_client_method(server_version); 858 if (method == NULL) { 859 SSLerror(s, ERR_R_INTERNAL_ERROR); 860 goto err; 861 } 862 s->method = method; 863 864 /* Server random. */ 865 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 866 goto truncated; 867 if (!CBS_write_bytes(&server_random, s->s3->server_random, 868 sizeof(s->s3->server_random), NULL)) 869 goto err; 870 871 /* Session ID. */ 872 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 873 goto truncated; 874 875 if ((CBS_len(&session_id) > sizeof(s->session->session_id)) || 876 (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE)) { 877 al = SSL_AD_ILLEGAL_PARAMETER; 878 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 879 goto f_err; 880 } 881 882 /* Cipher suite. */ 883 if (!CBS_get_u16(&cbs, &cipher_suite)) 884 goto truncated; 885 886 /* 887 * Check if we want to resume the session based on external 888 * pre-shared secret. 889 */ 890 if (s->internal->tls_session_secret_cb) { 891 SSL_CIPHER *pref_cipher = NULL; 892 s->session->master_key_length = sizeof(s->session->master_key); 893 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 894 &s->session->master_key_length, NULL, &pref_cipher, 895 s->internal->tls_session_secret_cb_arg)) { 896 s->session->cipher = pref_cipher ? pref_cipher : 897 ssl3_get_cipher_by_value(cipher_suite); 898 s->s3->flags |= SSL3_FLAGS_CCS_OK; 899 } 900 } 901 902 if (s->session->session_id_length != 0 && 903 CBS_mem_equal(&session_id, s->session->session_id, 904 s->session->session_id_length)) { 905 if (s->sid_ctx_length != s->session->sid_ctx_length || 906 timingsafe_memcmp(s->session->sid_ctx, 907 s->sid_ctx, s->sid_ctx_length) != 0) { 908 /* actually a client application bug */ 909 al = SSL_AD_ILLEGAL_PARAMETER; 910 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 911 goto f_err; 912 } 913 s->s3->flags |= SSL3_FLAGS_CCS_OK; 914 s->internal->hit = 1; 915 } else { 916 /* a miss or crap from the other end */ 917 918 /* If we were trying for session-id reuse, make a new 919 * SSL_SESSION so we don't stuff up other people */ 920 s->internal->hit = 0; 921 if (s->session->session_id_length > 0) { 922 if (!ssl_get_new_session(s, 0)) { 923 al = SSL_AD_INTERNAL_ERROR; 924 goto f_err; 925 } 926 } 927 928 /* 929 * XXX - improve the handling for the case where there is a 930 * zero length session identifier. 931 */ 932 if (!CBS_write_bytes(&session_id, s->session->session_id, 933 sizeof(s->session->session_id), &outlen)) 934 goto err; 935 s->session->session_id_length = outlen; 936 937 s->session->ssl_version = s->version; 938 } 939 940 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 941 al = SSL_AD_ILLEGAL_PARAMETER; 942 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 943 goto f_err; 944 } 945 946 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 947 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 948 (TLS1_get_version(s) < TLS1_2_VERSION)) { 949 al = SSL_AD_ILLEGAL_PARAMETER; 950 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 951 goto f_err; 952 } 953 954 sk = ssl_get_ciphers_by_id(s); 955 i = sk_SSL_CIPHER_find(sk, cipher); 956 if (i < 0) { 957 /* we did not say we would use this cipher */ 958 al = SSL_AD_ILLEGAL_PARAMETER; 959 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 960 goto f_err; 961 } 962 963 /* 964 * Depending on the session caching (internal/external), the cipher 965 * and/or cipher_id values may not be set. Make sure that 966 * cipher_id is set and use it for comparison. 967 */ 968 if (s->session->cipher) 969 s->session->cipher_id = s->session->cipher->id; 970 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 971 al = SSL_AD_ILLEGAL_PARAMETER; 972 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 973 goto f_err; 974 } 975 S3I(s)->hs.new_cipher = cipher; 976 977 if (!tls1_handshake_hash_init(s)) 978 goto err; 979 980 /* 981 * Don't digest cached records if no sigalgs: we may need them for 982 * client authentication. 983 */ 984 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 985 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) && 986 !tls1_digest_cached_records(s)) { 987 al = SSL_AD_INTERNAL_ERROR; 988 goto f_err; 989 } 990 991 if (!CBS_get_u8(&cbs, &compression_method)) 992 goto truncated; 993 994 if (compression_method != 0) { 995 al = SSL_AD_ILLEGAL_PARAMETER; 996 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 997 goto f_err; 998 } 999 1000 if (!tlsext_serverhello_parse(s, &cbs, &al)) { 1001 SSLerror(s, SSL_R_PARSE_TLSEXT); 1002 goto f_err; 1003 } 1004 1005 /* 1006 * Determine if we need to see RI. Strictly speaking if we want to 1007 * avoid an attack we should *always* see RI even on initial server 1008 * hello because the client doesn't see any renegotiation during an 1009 * attack. However this would mean we could not connect to any server 1010 * which doesn't support RI so for the immediate future tolerate RI 1011 * absence on initial connect only. 1012 */ 1013 if (!S3I(s)->renegotiate_seen && 1014 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1015 al = SSL_AD_HANDSHAKE_FAILURE; 1016 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1017 goto f_err; 1018 } 1019 1020 if (ssl_check_serverhello_tlsext(s) <= 0) { 1021 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1022 goto err; 1023 } 1024 1025 return (1); 1026 1027 truncated: 1028 /* wrong packet length */ 1029 al = SSL_AD_DECODE_ERROR; 1030 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1031 f_err: 1032 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1033 err: 1034 return (-1); 1035 } 1036 1037 int 1038 ssl3_get_server_certificate(SSL *s) 1039 { 1040 int al, i, ok, ret = -1; 1041 long n; 1042 CBS cbs, cert_list; 1043 X509 *x = NULL; 1044 const unsigned char *q; 1045 STACK_OF(X509) *sk = NULL; 1046 SESS_CERT *sc; 1047 EVP_PKEY *pkey = NULL; 1048 1049 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A, 1050 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1051 1052 if (!ok) 1053 return ((int)n); 1054 1055 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1056 S3I(s)->tmp.reuse_message = 1; 1057 return (1); 1058 } 1059 1060 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1061 al = SSL_AD_UNEXPECTED_MESSAGE; 1062 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1063 goto f_err; 1064 } 1065 1066 1067 if ((sk = sk_X509_new_null()) == NULL) { 1068 SSLerror(s, ERR_R_MALLOC_FAILURE); 1069 goto err; 1070 } 1071 1072 if (n < 0) 1073 goto truncated; 1074 1075 CBS_init(&cbs, s->internal->init_msg, n); 1076 if (CBS_len(&cbs) < 3) 1077 goto truncated; 1078 1079 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1080 CBS_len(&cbs) != 0) { 1081 al = SSL_AD_DECODE_ERROR; 1082 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1083 goto f_err; 1084 } 1085 1086 while (CBS_len(&cert_list) > 0) { 1087 CBS cert; 1088 1089 if (CBS_len(&cert_list) < 3) 1090 goto truncated; 1091 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1092 al = SSL_AD_DECODE_ERROR; 1093 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1094 goto f_err; 1095 } 1096 1097 q = CBS_data(&cert); 1098 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1099 if (x == NULL) { 1100 al = SSL_AD_BAD_CERTIFICATE; 1101 SSLerror(s, ERR_R_ASN1_LIB); 1102 goto f_err; 1103 } 1104 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1105 al = SSL_AD_DECODE_ERROR; 1106 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1107 goto f_err; 1108 } 1109 if (!sk_X509_push(sk, x)) { 1110 SSLerror(s, ERR_R_MALLOC_FAILURE); 1111 goto err; 1112 } 1113 x = NULL; 1114 } 1115 1116 i = ssl_verify_cert_chain(s, sk); 1117 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1118 al = ssl_verify_alarm_type(s->verify_result); 1119 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1120 goto f_err; 1121 1122 } 1123 ERR_clear_error(); /* but we keep s->verify_result */ 1124 1125 sc = ssl_sess_cert_new(); 1126 if (sc == NULL) 1127 goto err; 1128 ssl_sess_cert_free(SSI(s)->sess_cert); 1129 SSI(s)->sess_cert = sc; 1130 1131 sc->cert_chain = sk; 1132 /* 1133 * Inconsistency alert: cert_chain does include the peer's 1134 * certificate, which we don't include in s3_srvr.c 1135 */ 1136 x = sk_X509_value(sk, 0); 1137 sk = NULL; 1138 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1139 1140 pkey = X509_get_pubkey(x); 1141 1142 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1143 x = NULL; 1144 al = SSL3_AL_FATAL; 1145 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1146 goto f_err; 1147 } 1148 1149 i = ssl_cert_type(x, pkey); 1150 if (i < 0) { 1151 x = NULL; 1152 al = SSL3_AL_FATAL; 1153 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1154 goto f_err; 1155 } 1156 1157 sc->peer_cert_type = i; 1158 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1159 /* 1160 * Why would the following ever happen? 1161 * We just created sc a couple of lines ago. 1162 */ 1163 X509_free(sc->peer_pkeys[i].x509); 1164 sc->peer_pkeys[i].x509 = x; 1165 sc->peer_key = &(sc->peer_pkeys[i]); 1166 1167 X509_free(s->session->peer); 1168 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1169 s->session->peer = x; 1170 s->session->verify_result = s->verify_result; 1171 1172 x = NULL; 1173 ret = 1; 1174 1175 if (0) { 1176 truncated: 1177 /* wrong packet length */ 1178 al = SSL_AD_DECODE_ERROR; 1179 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1180 f_err: 1181 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1182 } 1183 err: 1184 EVP_PKEY_free(pkey); 1185 X509_free(x); 1186 sk_X509_pop_free(sk, X509_free); 1187 1188 return (ret); 1189 } 1190 1191 static int 1192 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1193 { 1194 CBS dhp, dhg, dhpk; 1195 BN_CTX *bn_ctx = NULL; 1196 SESS_CERT *sc = NULL; 1197 DH *dh = NULL; 1198 long alg_a; 1199 int al; 1200 1201 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1202 sc = SSI(s)->sess_cert; 1203 1204 if ((dh = DH_new()) == NULL) { 1205 SSLerror(s, ERR_R_DH_LIB); 1206 goto err; 1207 } 1208 1209 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1210 goto truncated; 1211 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1212 SSLerror(s, ERR_R_BN_LIB); 1213 goto err; 1214 } 1215 1216 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1217 goto truncated; 1218 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1219 SSLerror(s, ERR_R_BN_LIB); 1220 goto err; 1221 } 1222 1223 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1224 goto truncated; 1225 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1226 NULL)) == NULL) { 1227 SSLerror(s, ERR_R_BN_LIB); 1228 goto err; 1229 } 1230 1231 /* 1232 * Check the strength of the DH key just constructed. 1233 * Discard keys weaker than 1024 bits. 1234 */ 1235 if (DH_size(dh) < 1024 / 8) { 1236 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1237 goto err; 1238 } 1239 1240 if (alg_a & SSL_aRSA) 1241 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1242 else 1243 /* XXX - Anonymous DH, so no certificate or pkey. */ 1244 *pkey = NULL; 1245 1246 sc->peer_dh_tmp = dh; 1247 1248 return (1); 1249 1250 truncated: 1251 al = SSL_AD_DECODE_ERROR; 1252 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1253 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1254 1255 err: 1256 DH_free(dh); 1257 BN_CTX_free(bn_ctx); 1258 1259 return (-1); 1260 } 1261 1262 static int 1263 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1264 { 1265 const EC_GROUP *group; 1266 EC_GROUP *ngroup = NULL; 1267 EC_POINT *point = NULL; 1268 BN_CTX *bn_ctx = NULL; 1269 EC_KEY *ecdh = NULL; 1270 int ret = -1; 1271 1272 /* 1273 * Extract the server's ephemeral ECDH public key. 1274 */ 1275 1276 if ((ecdh = EC_KEY_new()) == NULL) { 1277 SSLerror(s, ERR_R_MALLOC_FAILURE); 1278 goto err; 1279 } 1280 1281 if ((ngroup = EC_GROUP_new_by_curve_name(nid)) == NULL) { 1282 SSLerror(s, ERR_R_EC_LIB); 1283 goto err; 1284 } 1285 if (EC_KEY_set_group(ecdh, ngroup) == 0) { 1286 SSLerror(s, ERR_R_EC_LIB); 1287 goto err; 1288 } 1289 1290 group = EC_KEY_get0_group(ecdh); 1291 1292 if ((point = EC_POINT_new(group)) == NULL || 1293 (bn_ctx = BN_CTX_new()) == NULL) { 1294 SSLerror(s, ERR_R_MALLOC_FAILURE); 1295 goto err; 1296 } 1297 1298 if (EC_POINT_oct2point(group, point, CBS_data(public), 1299 CBS_len(public), bn_ctx) == 0) { 1300 SSLerror(s, SSL_R_BAD_ECPOINT); 1301 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1302 goto err; 1303 } 1304 1305 EC_KEY_set_public_key(ecdh, point); 1306 sc->peer_ecdh_tmp = ecdh; 1307 ecdh = NULL; 1308 1309 ret = 1; 1310 1311 err: 1312 BN_CTX_free(bn_ctx); 1313 EC_GROUP_free(ngroup); 1314 EC_POINT_free(point); 1315 EC_KEY_free(ecdh); 1316 1317 return (ret); 1318 } 1319 1320 static int 1321 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1322 { 1323 size_t outlen; 1324 1325 if (nid != NID_X25519) { 1326 SSLerror(s, ERR_R_INTERNAL_ERROR); 1327 goto err; 1328 } 1329 1330 if (CBS_len(public) != X25519_KEY_LENGTH) { 1331 SSLerror(s, SSL_R_BAD_ECPOINT); 1332 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1333 goto err; 1334 } 1335 1336 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1337 SSLerror(s, ERR_R_MALLOC_FAILURE); 1338 goto err; 1339 } 1340 1341 return (1); 1342 1343 err: 1344 return (-1); 1345 } 1346 1347 static int 1348 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1349 { 1350 CBS public; 1351 uint8_t curve_type; 1352 uint16_t curve_id; 1353 SESS_CERT *sc; 1354 long alg_a; 1355 int nid; 1356 int al; 1357 1358 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1359 sc = SSI(s)->sess_cert; 1360 1361 /* Only named curves are supported. */ 1362 if (!CBS_get_u8(cbs, &curve_type) || 1363 curve_type != NAMED_CURVE_TYPE || 1364 !CBS_get_u16(cbs, &curve_id)) { 1365 al = SSL_AD_DECODE_ERROR; 1366 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1367 goto f_err; 1368 } 1369 1370 /* 1371 * Check that the curve is one of our preferences - if it is not, 1372 * the server has sent us an invalid curve. 1373 */ 1374 if (tls1_check_curve(s, curve_id) != 1) { 1375 al = SSL_AD_DECODE_ERROR; 1376 SSLerror(s, SSL_R_WRONG_CURVE); 1377 goto f_err; 1378 } 1379 1380 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1381 al = SSL_AD_INTERNAL_ERROR; 1382 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1383 goto f_err; 1384 } 1385 1386 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1387 goto truncated; 1388 1389 if (nid == NID_X25519) { 1390 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1391 goto err; 1392 } else { 1393 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1394 goto err; 1395 } 1396 1397 /* 1398 * The ECC/TLS specification does not mention the use of DSA to sign 1399 * ECParameters in the server key exchange message. We do support RSA 1400 * and ECDSA. 1401 */ 1402 if (alg_a & SSL_aRSA) 1403 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1404 else if (alg_a & SSL_aECDSA) 1405 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1406 else 1407 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1408 *pkey = NULL; 1409 1410 return (1); 1411 1412 truncated: 1413 al = SSL_AD_DECODE_ERROR; 1414 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1415 1416 f_err: 1417 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1418 1419 err: 1420 return (-1); 1421 } 1422 1423 int 1424 ssl3_get_server_key_exchange(SSL *s) 1425 { 1426 CBS cbs, signature; 1427 const EVP_MD *md = NULL; 1428 EVP_PKEY *pkey = NULL; 1429 EVP_MD_CTX md_ctx; 1430 const unsigned char *param; 1431 uint8_t hash_id, sig_id; 1432 long n, alg_k, alg_a; 1433 int al, ok, sigalg; 1434 size_t param_len; 1435 1436 EVP_MD_CTX_init(&md_ctx); 1437 1438 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1439 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1440 1441 /* 1442 * Use same message size as in ssl3_get_certificate_request() 1443 * as ServerKeyExchange message may be skipped. 1444 */ 1445 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1446 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1447 if (!ok) 1448 return ((int)n); 1449 1450 if (n < 0) 1451 goto err; 1452 1453 CBS_init(&cbs, s->internal->init_msg, n); 1454 1455 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1456 /* 1457 * Do not skip server key exchange if this cipher suite uses 1458 * ephemeral keys. 1459 */ 1460 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1461 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1462 al = SSL_AD_UNEXPECTED_MESSAGE; 1463 goto f_err; 1464 } 1465 1466 S3I(s)->tmp.reuse_message = 1; 1467 EVP_MD_CTX_cleanup(&md_ctx); 1468 return (1); 1469 } 1470 1471 if (SSI(s)->sess_cert != NULL) { 1472 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1473 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1474 1475 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1476 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1477 1478 free(SSI(s)->sess_cert->peer_x25519_tmp); 1479 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1480 } else { 1481 SSI(s)->sess_cert = ssl_sess_cert_new(); 1482 if (SSI(s)->sess_cert == NULL) 1483 goto err; 1484 } 1485 1486 param = CBS_data(&cbs); 1487 param_len = CBS_len(&cbs); 1488 1489 if (alg_k & SSL_kDHE) { 1490 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1491 goto err; 1492 } else if (alg_k & SSL_kECDHE) { 1493 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1494 goto err; 1495 } else if (alg_k != 0) { 1496 al = SSL_AD_UNEXPECTED_MESSAGE; 1497 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1498 goto f_err; 1499 } 1500 1501 param_len -= CBS_len(&cbs); 1502 1503 /* if it was signed, check the signature */ 1504 if (pkey != NULL) { 1505 if (SSL_USE_SIGALGS(s)) { 1506 if (!CBS_get_u8(&cbs, &hash_id)) 1507 goto truncated; 1508 if (!CBS_get_u8(&cbs, &sig_id)) 1509 goto truncated; 1510 1511 if ((md = tls12_get_hash(hash_id)) == NULL) { 1512 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1513 al = SSL_AD_DECODE_ERROR; 1514 goto f_err; 1515 } 1516 1517 /* Check key type is consistent with signature. */ 1518 if ((sigalg = tls12_get_sigid(pkey)) == -1) { 1519 /* Should never happen */ 1520 SSLerror(s, ERR_R_INTERNAL_ERROR); 1521 goto err; 1522 } 1523 if (sigalg != sig_id) { 1524 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1525 al = SSL_AD_DECODE_ERROR; 1526 goto f_err; 1527 } 1528 } else if (pkey->type == EVP_PKEY_RSA) { 1529 md = EVP_md5_sha1(); 1530 } else { 1531 md = EVP_sha1(); 1532 } 1533 1534 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1535 goto truncated; 1536 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1537 al = SSL_AD_DECODE_ERROR; 1538 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1539 goto f_err; 1540 } 1541 1542 if (!EVP_VerifyInit_ex(&md_ctx, md, NULL)) 1543 goto err; 1544 if (!EVP_VerifyUpdate(&md_ctx, s->s3->client_random, 1545 SSL3_RANDOM_SIZE)) 1546 goto err; 1547 if (!EVP_VerifyUpdate(&md_ctx, s->s3->server_random, 1548 SSL3_RANDOM_SIZE)) 1549 goto err; 1550 if (!EVP_VerifyUpdate(&md_ctx, param, param_len)) 1551 goto err; 1552 if (EVP_VerifyFinal(&md_ctx, CBS_data(&signature), 1553 CBS_len(&signature), pkey) <= 0) { 1554 al = SSL_AD_DECRYPT_ERROR; 1555 SSLerror(s, SSL_R_BAD_SIGNATURE); 1556 goto f_err; 1557 } 1558 } else { 1559 /* aNULL does not need public keys. */ 1560 if (!(alg_a & SSL_aNULL)) { 1561 SSLerror(s, ERR_R_INTERNAL_ERROR); 1562 goto err; 1563 } 1564 } 1565 1566 if (CBS_len(&cbs) != 0) { 1567 al = SSL_AD_DECODE_ERROR; 1568 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1569 goto f_err; 1570 } 1571 1572 EVP_PKEY_free(pkey); 1573 EVP_MD_CTX_cleanup(&md_ctx); 1574 1575 return (1); 1576 1577 truncated: 1578 al = SSL_AD_DECODE_ERROR; 1579 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1580 1581 f_err: 1582 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1583 1584 err: 1585 EVP_PKEY_free(pkey); 1586 EVP_MD_CTX_cleanup(&md_ctx); 1587 1588 return (-1); 1589 } 1590 1591 int 1592 ssl3_get_certificate_request(SSL *s) 1593 { 1594 int ok, ret = 0; 1595 long n; 1596 uint8_t ctype_num; 1597 CBS cert_request, ctypes, rdn_list; 1598 X509_NAME *xn = NULL; 1599 const unsigned char *q; 1600 STACK_OF(X509_NAME) *ca_sk = NULL; 1601 1602 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1603 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1604 1605 if (!ok) 1606 return ((int)n); 1607 1608 S3I(s)->tmp.cert_req = 0; 1609 1610 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1611 S3I(s)->tmp.reuse_message = 1; 1612 /* 1613 * If we get here we don't need any cached handshake records 1614 * as we wont be doing client auth. 1615 */ 1616 if (S3I(s)->handshake_buffer) { 1617 if (!tls1_digest_cached_records(s)) 1618 goto err; 1619 } 1620 return (1); 1621 } 1622 1623 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1624 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1625 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1626 goto err; 1627 } 1628 1629 /* TLS does not like anon-DH with client cert */ 1630 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1631 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1632 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1633 goto err; 1634 } 1635 1636 if (n < 0) 1637 goto truncated; 1638 CBS_init(&cert_request, s->internal->init_msg, n); 1639 1640 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1641 SSLerror(s, ERR_R_MALLOC_FAILURE); 1642 goto err; 1643 } 1644 1645 /* get the certificate types */ 1646 if (!CBS_get_u8(&cert_request, &ctype_num)) 1647 goto truncated; 1648 1649 if (ctype_num > SSL3_CT_NUMBER) 1650 ctype_num = SSL3_CT_NUMBER; 1651 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1652 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1653 sizeof(S3I(s)->tmp.ctype), NULL)) { 1654 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1655 goto err; 1656 } 1657 1658 if (SSL_USE_SIGALGS(s)) { 1659 CBS sigalgs; 1660 1661 if (CBS_len(&cert_request) < 2) { 1662 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1663 goto err; 1664 } 1665 1666 /* Check we have enough room for signature algorithms and 1667 * following length value. 1668 */ 1669 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1670 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1671 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1672 goto err; 1673 } 1674 if (!tls1_process_sigalgs(s, &sigalgs)) { 1675 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1676 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1677 goto err; 1678 } 1679 } 1680 1681 /* get the CA RDNs */ 1682 if (CBS_len(&cert_request) < 2) { 1683 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1684 goto err; 1685 } 1686 1687 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1688 CBS_len(&cert_request) != 0) { 1689 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1690 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1691 goto err; 1692 } 1693 1694 while (CBS_len(&rdn_list) > 0) { 1695 CBS rdn; 1696 1697 if (CBS_len(&rdn_list) < 2) { 1698 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1699 goto err; 1700 } 1701 1702 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1703 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1704 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1705 goto err; 1706 } 1707 1708 q = CBS_data(&rdn); 1709 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1710 ssl3_send_alert(s, SSL3_AL_FATAL, 1711 SSL_AD_DECODE_ERROR); 1712 SSLerror(s, ERR_R_ASN1_LIB); 1713 goto err; 1714 } 1715 1716 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1717 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1718 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1719 goto err; 1720 } 1721 if (!sk_X509_NAME_push(ca_sk, xn)) { 1722 SSLerror(s, ERR_R_MALLOC_FAILURE); 1723 goto err; 1724 } 1725 xn = NULL; /* avoid free in err block */ 1726 } 1727 1728 /* we should setup a certificate to return.... */ 1729 S3I(s)->tmp.cert_req = 1; 1730 S3I(s)->tmp.ctype_num = ctype_num; 1731 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1732 S3I(s)->tmp.ca_names = ca_sk; 1733 ca_sk = NULL; 1734 1735 ret = 1; 1736 if (0) { 1737 truncated: 1738 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1739 } 1740 err: 1741 X509_NAME_free(xn); 1742 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1743 return (ret); 1744 } 1745 1746 static int 1747 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1748 { 1749 return (X509_NAME_cmp(*a, *b)); 1750 } 1751 1752 int 1753 ssl3_get_new_session_ticket(SSL *s) 1754 { 1755 int ok, al, ret = 0; 1756 uint32_t lifetime_hint; 1757 long n; 1758 CBS cbs, session_ticket; 1759 1760 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1761 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1762 if (!ok) 1763 return ((int)n); 1764 1765 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1766 S3I(s)->tmp.reuse_message = 1; 1767 return (1); 1768 } 1769 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1770 al = SSL_AD_UNEXPECTED_MESSAGE; 1771 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1772 goto f_err; 1773 } 1774 1775 if (n < 0) { 1776 al = SSL_AD_DECODE_ERROR; 1777 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1778 goto f_err; 1779 } 1780 1781 CBS_init(&cbs, s->internal->init_msg, n); 1782 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1783 #if UINT32_MAX > LONG_MAX 1784 lifetime_hint > LONG_MAX || 1785 #endif 1786 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1787 CBS_len(&cbs) != 0) { 1788 al = SSL_AD_DECODE_ERROR; 1789 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1790 goto f_err; 1791 } 1792 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1793 1794 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1795 &s->session->tlsext_ticklen)) { 1796 SSLerror(s, ERR_R_MALLOC_FAILURE); 1797 goto err; 1798 } 1799 1800 /* 1801 * There are two ways to detect a resumed ticket sesion. 1802 * One is to set an appropriate session ID and then the server 1803 * must return a match in ServerHello. This allows the normal 1804 * client session ID matching to work and we know much 1805 * earlier that the ticket has been accepted. 1806 * 1807 * The other way is to set zero length session ID when the 1808 * ticket is presented and rely on the handshake to determine 1809 * session resumption. 1810 * 1811 * We choose the former approach because this fits in with 1812 * assumptions elsewhere in OpenSSL. The session ID is set 1813 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1814 * ticket. 1815 */ 1816 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1817 s->session->session_id, &s->session->session_id_length, 1818 EVP_sha256(), NULL); 1819 ret = 1; 1820 return (ret); 1821 f_err: 1822 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1823 err: 1824 return (-1); 1825 } 1826 1827 int 1828 ssl3_get_cert_status(SSL *s) 1829 { 1830 CBS cert_status, response; 1831 size_t stow_len; 1832 int ok, al; 1833 long n; 1834 uint8_t status_type; 1835 1836 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1837 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1838 16384, &ok); 1839 1840 if (!ok) 1841 return ((int)n); 1842 1843 if (n < 0) { 1844 /* need at least status type + length */ 1845 al = SSL_AD_DECODE_ERROR; 1846 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1847 goto f_err; 1848 } 1849 1850 CBS_init(&cert_status, s->internal->init_msg, n); 1851 if (!CBS_get_u8(&cert_status, &status_type) || 1852 CBS_len(&cert_status) < 3) { 1853 /* need at least status type + length */ 1854 al = SSL_AD_DECODE_ERROR; 1855 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1856 goto f_err; 1857 } 1858 1859 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1860 al = SSL_AD_DECODE_ERROR; 1861 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1862 goto f_err; 1863 } 1864 1865 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1866 CBS_len(&cert_status) != 0) { 1867 al = SSL_AD_DECODE_ERROR; 1868 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1869 goto f_err; 1870 } 1871 1872 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1873 &stow_len) || stow_len > INT_MAX) { 1874 s->internal->tlsext_ocsp_resplen = 0; 1875 al = SSL_AD_INTERNAL_ERROR; 1876 SSLerror(s, ERR_R_MALLOC_FAILURE); 1877 goto f_err; 1878 } 1879 s->internal->tlsext_ocsp_resplen = (int)stow_len; 1880 1881 if (s->ctx->internal->tlsext_status_cb) { 1882 int ret; 1883 ret = s->ctx->internal->tlsext_status_cb(s, 1884 s->ctx->internal->tlsext_status_arg); 1885 if (ret == 0) { 1886 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1887 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1888 goto f_err; 1889 } 1890 if (ret < 0) { 1891 al = SSL_AD_INTERNAL_ERROR; 1892 SSLerror(s, ERR_R_MALLOC_FAILURE); 1893 goto f_err; 1894 } 1895 } 1896 return (1); 1897 f_err: 1898 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1899 return (-1); 1900 } 1901 1902 int 1903 ssl3_get_server_done(SSL *s) 1904 { 1905 int ok, ret = 0; 1906 long n; 1907 1908 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1909 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1910 30, /* should be very small, like 0 :-) */ &ok); 1911 1912 if (!ok) 1913 return ((int)n); 1914 if (n > 0) { 1915 /* should contain no data */ 1916 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1917 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1918 return (-1); 1919 } 1920 ret = 1; 1921 return (ret); 1922 } 1923 1924 static int 1925 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1926 { 1927 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1928 unsigned char *enc_pms = NULL; 1929 EVP_PKEY *pkey = NULL; 1930 int ret = -1; 1931 int enc_len; 1932 CBB epms; 1933 1934 /* 1935 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1936 */ 1937 1938 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1939 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1940 pkey->pkey.rsa == NULL) { 1941 SSLerror(s, ERR_R_INTERNAL_ERROR); 1942 goto err; 1943 } 1944 1945 pms[0] = s->client_version >> 8; 1946 pms[1] = s->client_version & 0xff; 1947 arc4random_buf(&pms[2], sizeof(pms) - 2); 1948 1949 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1950 SSLerror(s, ERR_R_MALLOC_FAILURE); 1951 goto err; 1952 } 1953 1954 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1955 RSA_PKCS1_PADDING); 1956 if (enc_len <= 0) { 1957 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1958 goto err; 1959 } 1960 1961 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1962 goto err; 1963 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1964 goto err; 1965 if (!CBB_flush(cbb)) 1966 goto err; 1967 1968 s->session->master_key_length = 1969 tls1_generate_master_secret(s, 1970 s->session->master_key, pms, sizeof(pms)); 1971 1972 ret = 1; 1973 1974 err: 1975 explicit_bzero(pms, sizeof(pms)); 1976 EVP_PKEY_free(pkey); 1977 free(enc_pms); 1978 1979 return (ret); 1980 } 1981 1982 static int 1983 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1984 { 1985 DH *dh_srvr = NULL, *dh_clnt = NULL; 1986 unsigned char *key = NULL; 1987 int key_size = 0, key_len; 1988 unsigned char *data; 1989 int ret = -1; 1990 CBB dh_Yc; 1991 1992 /* Ensure that we have an ephemeral key for DHE. */ 1993 if (sess_cert->peer_dh_tmp == NULL) { 1994 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1995 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1996 goto err; 1997 } 1998 dh_srvr = sess_cert->peer_dh_tmp; 1999 2000 /* Generate a new random key. */ 2001 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2002 SSLerror(s, ERR_R_DH_LIB); 2003 goto err; 2004 } 2005 if (!DH_generate_key(dh_clnt)) { 2006 SSLerror(s, ERR_R_DH_LIB); 2007 goto err; 2008 } 2009 if ((key_size = DH_size(dh_clnt)) <= 0) { 2010 SSLerror(s, ERR_R_DH_LIB); 2011 goto err; 2012 } 2013 if ((key = malloc(key_size)) == NULL) { 2014 SSLerror(s, ERR_R_MALLOC_FAILURE); 2015 goto err; 2016 } 2017 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2018 SSLerror(s, ERR_R_DH_LIB); 2019 goto err; 2020 } 2021 2022 /* Generate master key from the result. */ 2023 s->session->master_key_length = 2024 tls1_generate_master_secret(s, 2025 s->session->master_key, key, key_len); 2026 2027 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2028 goto err; 2029 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2030 goto err; 2031 BN_bn2bin(dh_clnt->pub_key, data); 2032 if (!CBB_flush(cbb)) 2033 goto err; 2034 2035 ret = 1; 2036 2037 err: 2038 DH_free(dh_clnt); 2039 freezero(key, key_size); 2040 2041 return (ret); 2042 } 2043 2044 static int 2045 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2046 { 2047 const EC_GROUP *group = NULL; 2048 const EC_POINT *point = NULL; 2049 EC_KEY *ecdh = NULL; 2050 BN_CTX *bn_ctx = NULL; 2051 unsigned char *key = NULL; 2052 unsigned char *data; 2053 size_t encoded_len; 2054 int key_size = 0, key_len; 2055 int ret = -1; 2056 CBB ecpoint; 2057 2058 if ((group = EC_KEY_get0_group(sc->peer_ecdh_tmp)) == NULL || 2059 (point = EC_KEY_get0_public_key(sc->peer_ecdh_tmp)) == NULL) { 2060 SSLerror(s, ERR_R_INTERNAL_ERROR); 2061 goto err; 2062 } 2063 2064 if ((ecdh = EC_KEY_new()) == NULL) { 2065 SSLerror(s, ERR_R_MALLOC_FAILURE); 2066 goto err; 2067 } 2068 2069 if (!EC_KEY_set_group(ecdh, group)) { 2070 SSLerror(s, ERR_R_EC_LIB); 2071 goto err; 2072 } 2073 2074 /* Generate a new ECDH key pair. */ 2075 if (!EC_KEY_generate_key(ecdh)) { 2076 SSLerror(s, ERR_R_ECDH_LIB); 2077 goto err; 2078 } 2079 if ((key_size = ECDH_size(ecdh)) <= 0) { 2080 SSLerror(s, ERR_R_ECDH_LIB); 2081 goto err; 2082 } 2083 if ((key = malloc(key_size)) == NULL) { 2084 SSLerror(s, ERR_R_MALLOC_FAILURE); 2085 goto err; 2086 } 2087 key_len = ECDH_compute_key(key, key_size, point, ecdh, NULL); 2088 if (key_len <= 0) { 2089 SSLerror(s, ERR_R_ECDH_LIB); 2090 goto err; 2091 } 2092 2093 /* Generate master key from the result. */ 2094 s->session->master_key_length = 2095 tls1_generate_master_secret(s, 2096 s->session->master_key, key, key_len); 2097 2098 encoded_len = EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh), 2099 POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL); 2100 if (encoded_len == 0) { 2101 SSLerror(s, ERR_R_ECDH_LIB); 2102 goto err; 2103 } 2104 2105 if ((bn_ctx = BN_CTX_new()) == NULL) { 2106 SSLerror(s, ERR_R_MALLOC_FAILURE); 2107 goto err; 2108 } 2109 2110 /* Encode the public key. */ 2111 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2112 goto err; 2113 if (!CBB_add_space(&ecpoint, &data, encoded_len)) 2114 goto err; 2115 if (EC_POINT_point2oct(group, EC_KEY_get0_public_key(ecdh), 2116 POINT_CONVERSION_UNCOMPRESSED, data, encoded_len, 2117 bn_ctx) == 0) 2118 goto err; 2119 if (!CBB_flush(cbb)) 2120 goto err; 2121 2122 ret = 1; 2123 2124 err: 2125 freezero(key, key_size); 2126 2127 BN_CTX_free(bn_ctx); 2128 EC_KEY_free(ecdh); 2129 2130 return (ret); 2131 } 2132 2133 static int 2134 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2135 { 2136 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2137 int ret = -1; 2138 CBB ecpoint; 2139 2140 /* Generate X25519 key pair and derive shared key. */ 2141 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2142 goto err; 2143 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2144 goto err; 2145 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2146 goto err; 2147 X25519_keypair(public_key, private_key); 2148 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2149 goto err; 2150 2151 /* Serialize the public key. */ 2152 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2153 goto err; 2154 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2155 goto err; 2156 if (!CBB_flush(cbb)) 2157 goto err; 2158 2159 /* Generate master key from the result. */ 2160 s->session->master_key_length = 2161 tls1_generate_master_secret(s, 2162 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2163 2164 ret = 1; 2165 2166 err: 2167 free(public_key); 2168 freezero(private_key, X25519_KEY_LENGTH); 2169 freezero(shared_key, X25519_KEY_LENGTH); 2170 2171 return (ret); 2172 } 2173 2174 static int 2175 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2176 { 2177 if (sc->peer_x25519_tmp != NULL) { 2178 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2179 goto err; 2180 } else if (sc->peer_ecdh_tmp != NULL) { 2181 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2182 goto err; 2183 } else { 2184 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2185 SSLerror(s, ERR_R_INTERNAL_ERROR); 2186 goto err; 2187 } 2188 2189 return (1); 2190 2191 err: 2192 return (-1); 2193 } 2194 2195 static int 2196 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2197 { 2198 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2199 EVP_PKEY *pub_key = NULL; 2200 EVP_PKEY_CTX *pkey_ctx; 2201 X509 *peer_cert; 2202 size_t msglen; 2203 unsigned int md_len; 2204 EVP_MD_CTX *ukm_hash; 2205 int ret = -1; 2206 int nid; 2207 CBB gostblob; 2208 2209 /* Get server sertificate PKEY and create ctx from it */ 2210 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2211 if (peer_cert == NULL) { 2212 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2213 goto err; 2214 } 2215 2216 pub_key = X509_get_pubkey(peer_cert); 2217 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2218 2219 /* 2220 * If we have send a certificate, and certificate key parameters match 2221 * those of server certificate, use certificate key for key exchange. 2222 * Otherwise, generate ephemeral key pair. 2223 */ 2224 EVP_PKEY_encrypt_init(pkey_ctx); 2225 2226 /* Generate session key. */ 2227 arc4random_buf(premaster_secret, 32); 2228 2229 /* 2230 * If we have client certificate, use its secret as peer key. 2231 */ 2232 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2233 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2234 s->cert->key->privatekey) <=0) { 2235 /* 2236 * If there was an error - just ignore it. 2237 * Ephemeral key would be used. 2238 */ 2239 ERR_clear_error(); 2240 } 2241 } 2242 2243 /* 2244 * Compute shared IV and store it in algorithm-specific context data. 2245 */ 2246 ukm_hash = EVP_MD_CTX_new(); 2247 if (ukm_hash == NULL) { 2248 SSLerror(s, ERR_R_MALLOC_FAILURE); 2249 goto err; 2250 } 2251 2252 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94) 2253 nid = NID_id_GostR3411_94; 2254 else 2255 nid = NID_id_tc26_gost3411_2012_256; 2256 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2257 goto err; 2258 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2259 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2260 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2261 EVP_MD_CTX_free(ukm_hash); 2262 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2263 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2264 SSLerror(s, SSL_R_LIBRARY_BUG); 2265 goto err; 2266 } 2267 2268 /* 2269 * Make GOST keytransport blob message, encapsulate it into sequence. 2270 */ 2271 msglen = 255; 2272 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2273 32) < 0) { 2274 SSLerror(s, SSL_R_LIBRARY_BUG); 2275 goto err; 2276 } 2277 2278 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2279 goto err; 2280 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2281 goto err; 2282 if (!CBB_flush(cbb)) 2283 goto err; 2284 2285 /* Check if pubkey from client certificate was used. */ 2286 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2287 NULL) > 0) { 2288 /* Set flag "skip certificate verify". */ 2289 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2290 } 2291 EVP_PKEY_CTX_free(pkey_ctx); 2292 s->session->master_key_length = 2293 tls1_generate_master_secret(s, 2294 s->session->master_key, premaster_secret, 32); 2295 2296 ret = 1; 2297 2298 err: 2299 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2300 EVP_PKEY_free(pub_key); 2301 2302 return (ret); 2303 } 2304 2305 int 2306 ssl3_send_client_key_exchange(SSL *s) 2307 { 2308 SESS_CERT *sess_cert; 2309 unsigned long alg_k; 2310 CBB cbb, kex; 2311 2312 memset(&cbb, 0, sizeof(cbb)); 2313 2314 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2315 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2316 2317 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2318 ssl3_send_alert(s, SSL3_AL_FATAL, 2319 SSL_AD_UNEXPECTED_MESSAGE); 2320 SSLerror(s, ERR_R_INTERNAL_ERROR); 2321 goto err; 2322 } 2323 2324 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2325 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2326 goto err; 2327 2328 if (alg_k & SSL_kRSA) { 2329 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2330 goto err; 2331 } else if (alg_k & SSL_kDHE) { 2332 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2333 goto err; 2334 } else if (alg_k & SSL_kECDHE) { 2335 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2336 goto err; 2337 } else if (alg_k & SSL_kGOST) { 2338 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2339 goto err; 2340 } else { 2341 ssl3_send_alert(s, SSL3_AL_FATAL, 2342 SSL_AD_HANDSHAKE_FAILURE); 2343 SSLerror(s, ERR_R_INTERNAL_ERROR); 2344 goto err; 2345 } 2346 2347 if (!ssl3_handshake_msg_finish(s, &cbb)) 2348 goto err; 2349 2350 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2351 } 2352 2353 /* SSL3_ST_CW_KEY_EXCH_B */ 2354 return (ssl3_handshake_write(s)); 2355 2356 err: 2357 CBB_cleanup(&cbb); 2358 2359 return (-1); 2360 } 2361 2362 int 2363 ssl3_send_client_verify(SSL *s) 2364 { 2365 CBB cbb, cert_verify, cbb_signature; 2366 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 2367 unsigned char *signature = NULL; 2368 unsigned int signature_len; 2369 EVP_PKEY_CTX *pctx = NULL; 2370 EVP_PKEY *pkey; 2371 EVP_MD_CTX mctx; 2372 const EVP_MD *md; 2373 long hdatalen; 2374 void *hdata; 2375 2376 EVP_MD_CTX_init(&mctx); 2377 2378 memset(&cbb, 0, sizeof(cbb)); 2379 2380 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2381 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2382 SSL3_MT_CERTIFICATE_VERIFY)) 2383 goto err; 2384 2385 /* 2386 * Create context from key and test if sha1 is allowed as 2387 * digest. 2388 */ 2389 pkey = s->cert->key->privatekey; 2390 pctx = EVP_PKEY_CTX_new(pkey, NULL); 2391 EVP_PKEY_sign_init(pctx); 2392 2393 /* XXX - is this needed? */ 2394 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1()) <= 0) 2395 ERR_clear_error(); 2396 2397 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2398 goto err; 2399 2400 if (!SSL_USE_SIGALGS(s)) { 2401 if (S3I(s)->handshake_buffer) { 2402 if (!tls1_digest_cached_records(s)) 2403 goto err; 2404 } 2405 if (!tls1_handshake_hash_value(s, data, sizeof(data), 2406 NULL)) 2407 goto err; 2408 } 2409 2410 /* 2411 * For TLS v1.2 send signature algorithm and signature 2412 * using agreed digest and cached handshake records. 2413 */ 2414 if (SSL_USE_SIGALGS(s)) { 2415 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, 2416 &hdata); 2417 md = s->cert->key->digest; 2418 if (hdatalen <= 0 || 2419 !tls12_get_hashandsig(&cert_verify, pkey, md)) { 2420 SSLerror(s, ERR_R_INTERNAL_ERROR); 2421 goto err; 2422 } 2423 if (!EVP_SignInit_ex(&mctx, md, NULL) || 2424 !EVP_SignUpdate(&mctx, hdata, hdatalen) || 2425 !EVP_SignFinal(&mctx, signature, &signature_len, 2426 pkey)) { 2427 SSLerror(s, ERR_R_EVP_LIB); 2428 goto err; 2429 } 2430 if (!tls1_digest_cached_records(s)) 2431 goto err; 2432 } else if (pkey->type == EVP_PKEY_RSA) { 2433 if (RSA_sign(NID_md5_sha1, data, 2434 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, signature, 2435 &signature_len, pkey->pkey.rsa) <= 0 ) { 2436 SSLerror(s, ERR_R_RSA_LIB); 2437 goto err; 2438 } 2439 } else if (pkey->type == EVP_PKEY_EC) { 2440 if (!ECDSA_sign(pkey->save_type, 2441 &data[MD5_DIGEST_LENGTH], SHA_DIGEST_LENGTH, 2442 signature, &signature_len, pkey->pkey.ec)) { 2443 SSLerror(s, ERR_R_ECDSA_LIB); 2444 goto err; 2445 } 2446 #ifndef OPENSSL_NO_GOST 2447 } else if (pkey->type == NID_id_GostR3410_94 || 2448 pkey->type == NID_id_GostR3410_2001) { 2449 unsigned char signbuf[128]; 2450 unsigned int u; 2451 size_t sigsize; 2452 int nid; 2453 2454 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata); 2455 if (hdatalen <= 0) { 2456 SSLerror(s, ERR_R_INTERNAL_ERROR); 2457 goto err; 2458 } 2459 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2460 !(md = EVP_get_digestbynid(nid))) { 2461 SSLerror(s, ERR_R_EVP_LIB); 2462 goto err; 2463 } 2464 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2465 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2466 !EVP_DigestFinal(&mctx, signbuf, &u) || 2467 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2468 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2469 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2470 GOST_SIG_FORMAT_RS_LE, NULL) <= 0) || 2471 (EVP_PKEY_sign(pctx, signature, &sigsize, 2472 signbuf, u) <= 0)) { 2473 SSLerror(s, ERR_R_EVP_LIB); 2474 goto err; 2475 } 2476 if (sigsize > UINT_MAX) 2477 goto err; 2478 signature_len = sigsize; 2479 if (!tls1_digest_cached_records(s)) 2480 goto err; 2481 #endif 2482 } else { 2483 SSLerror(s, ERR_R_INTERNAL_ERROR); 2484 goto err; 2485 } 2486 2487 if (!CBB_add_u16_length_prefixed(&cert_verify, &cbb_signature)) 2488 goto err; 2489 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2490 goto err; 2491 2492 if (!ssl3_handshake_msg_finish(s, &cbb)) 2493 goto err; 2494 2495 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2496 } 2497 2498 EVP_MD_CTX_cleanup(&mctx); 2499 EVP_PKEY_CTX_free(pctx); 2500 free(signature); 2501 2502 return (ssl3_handshake_write(s)); 2503 2504 err: 2505 CBB_cleanup(&cbb); 2506 EVP_MD_CTX_cleanup(&mctx); 2507 EVP_PKEY_CTX_free(pctx); 2508 free(signature); 2509 2510 return (-1); 2511 } 2512 2513 int 2514 ssl3_send_client_certificate(SSL *s) 2515 { 2516 EVP_PKEY *pkey = NULL; 2517 X509 *x509 = NULL; 2518 CBB cbb, client_cert; 2519 int i; 2520 2521 memset(&cbb, 0, sizeof(cbb)); 2522 2523 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2524 if ((s->cert == NULL) || (s->cert->key->x509 == NULL) || 2525 (s->cert->key->privatekey == NULL)) 2526 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2527 else 2528 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2529 } 2530 2531 /* We need to get a client cert */ 2532 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2533 /* 2534 * If we get an error, we need to 2535 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2536 * We then get retied later 2537 */ 2538 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2539 if (i < 0) { 2540 s->internal->rwstate = SSL_X509_LOOKUP; 2541 return (-1); 2542 } 2543 s->internal->rwstate = SSL_NOTHING; 2544 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2545 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2546 if (!SSL_use_certificate(s, x509) || 2547 !SSL_use_PrivateKey(s, pkey)) 2548 i = 0; 2549 } else if (i == 1) { 2550 i = 0; 2551 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2552 } 2553 2554 X509_free(x509); 2555 EVP_PKEY_free(pkey); 2556 if (i == 0) 2557 S3I(s)->tmp.cert_req = 2; 2558 2559 /* Ok, we have a cert */ 2560 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2561 } 2562 2563 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2564 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2565 SSL3_MT_CERTIFICATE)) 2566 goto err; 2567 if (!ssl3_output_cert_chain(s, &client_cert, 2568 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key->x509)) 2569 goto err; 2570 if (!ssl3_handshake_msg_finish(s, &cbb)) 2571 goto err; 2572 2573 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2574 } 2575 2576 /* SSL3_ST_CW_CERT_D */ 2577 return (ssl3_handshake_write(s)); 2578 2579 err: 2580 CBB_cleanup(&cbb); 2581 2582 return (0); 2583 } 2584 2585 #define has_bits(i,m) (((i)&(m)) == (m)) 2586 2587 int 2588 ssl3_check_cert_and_algorithm(SSL *s) 2589 { 2590 int i, idx; 2591 long alg_k, alg_a; 2592 EVP_PKEY *pkey = NULL; 2593 SESS_CERT *sc; 2594 DH *dh; 2595 2596 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2597 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2598 2599 /* We don't have a certificate. */ 2600 if (alg_a & SSL_aNULL) 2601 return (1); 2602 2603 sc = SSI(s)->sess_cert; 2604 if (sc == NULL) { 2605 SSLerror(s, ERR_R_INTERNAL_ERROR); 2606 goto err; 2607 } 2608 dh = SSI(s)->sess_cert->peer_dh_tmp; 2609 2610 /* This is the passed certificate. */ 2611 2612 idx = sc->peer_cert_type; 2613 if (idx == SSL_PKEY_ECC) { 2614 if (ssl_check_srvr_ecc_cert_and_alg( 2615 sc->peer_pkeys[idx].x509, s) == 0) { 2616 /* check failed */ 2617 SSLerror(s, SSL_R_BAD_ECC_CERT); 2618 goto f_err; 2619 } else { 2620 return (1); 2621 } 2622 } 2623 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2624 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2625 EVP_PKEY_free(pkey); 2626 2627 /* Check that we have a certificate if we require one. */ 2628 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2629 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2630 goto f_err; 2631 } 2632 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2633 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2634 goto f_err; 2635 } 2636 if ((alg_k & SSL_kDHE) && 2637 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2638 SSLerror(s, SSL_R_MISSING_DH_KEY); 2639 goto f_err; 2640 } 2641 2642 return (1); 2643 f_err: 2644 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2645 err: 2646 return (0); 2647 } 2648 2649 /* 2650 * Check to see if handshake is full or resumed. Usually this is just a 2651 * case of checking to see if a cache hit has occurred. In the case of 2652 * session tickets we have to check the next message to be sure. 2653 */ 2654 2655 int 2656 ssl3_check_finished(SSL *s) 2657 { 2658 int ok; 2659 long n; 2660 2661 /* If we have no ticket it cannot be a resumed session. */ 2662 if (!s->session->tlsext_tick) 2663 return (1); 2664 /* this function is called when we really expect a Certificate 2665 * message, so permit appropriate message length */ 2666 n = s->method->internal->ssl_get_message(s, SSL3_ST_CR_CERT_A, 2667 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2668 if (!ok) 2669 return ((int)n); 2670 S3I(s)->tmp.reuse_message = 1; 2671 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2672 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2673 return (2); 2674 2675 return (1); 2676 } 2677 2678 int 2679 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2680 { 2681 int i = 0; 2682 2683 #ifndef OPENSSL_NO_ENGINE 2684 if (s->ctx->internal->client_cert_engine) { 2685 i = ENGINE_load_ssl_client_cert( 2686 s->ctx->internal->client_cert_engine, s, 2687 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2688 if (i != 0) 2689 return (i); 2690 } 2691 #endif 2692 if (s->ctx->internal->client_cert_cb) 2693 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2694 return (i); 2695 } 2696