1 /* $OpenBSD: ssl_clnt.c,v 1.76 2020/10/14 16:57:33 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_sigalgs.h" 174 #include "ssl_tlsext.h" 175 176 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b); 177 178 int 179 ssl3_connect(SSL *s) 180 { 181 void (*cb)(const SSL *ssl, int type, int val) = NULL; 182 int ret = -1; 183 int new_state, state, skip = 0; 184 185 ERR_clear_error(); 186 errno = 0; 187 188 if (s->internal->info_callback != NULL) 189 cb = s->internal->info_callback; 190 else if (s->ctx->internal->info_callback != NULL) 191 cb = s->ctx->internal->info_callback; 192 193 s->internal->in_handshake++; 194 if (!SSL_in_init(s) || SSL_in_before(s)) 195 SSL_clear(s); 196 197 for (;;) { 198 state = S3I(s)->hs.state; 199 200 switch (S3I(s)->hs.state) { 201 case SSL_ST_RENEGOTIATE: 202 s->internal->renegotiate = 1; 203 S3I(s)->hs.state = SSL_ST_CONNECT; 204 s->ctx->internal->stats.sess_connect_renegotiate++; 205 /* break */ 206 case SSL_ST_BEFORE: 207 case SSL_ST_CONNECT: 208 case SSL_ST_BEFORE|SSL_ST_CONNECT: 209 case SSL_ST_OK|SSL_ST_CONNECT: 210 211 s->server = 0; 212 if (cb != NULL) 213 cb(s, SSL_CB_HANDSHAKE_START, 1); 214 215 if (SSL_is_dtls(s)) { 216 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { 217 SSLerror(s, ERR_R_INTERNAL_ERROR); 218 ret = -1; 219 goto end; 220 } 221 } else { 222 if ((s->version & 0xff00) != 0x0300) { 223 SSLerror(s, ERR_R_INTERNAL_ERROR); 224 ret = -1; 225 goto end; 226 } 227 } 228 229 /* s->version=SSL3_VERSION; */ 230 s->internal->type = SSL_ST_CONNECT; 231 232 if (!ssl3_setup_init_buffer(s)) { 233 ret = -1; 234 goto end; 235 } 236 if (!ssl3_setup_buffers(s)) { 237 ret = -1; 238 goto end; 239 } 240 if (!ssl_init_wbio_buffer(s, 0)) { 241 ret = -1; 242 goto end; 243 } 244 245 /* don't push the buffering BIO quite yet */ 246 247 if (!tls1_transcript_init(s)) { 248 ret = -1; 249 goto end; 250 } 251 252 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 253 s->ctx->internal->stats.sess_connect++; 254 s->internal->init_num = 0; 255 256 if (SSL_is_dtls(s)) { 257 /* mark client_random uninitialized */ 258 memset(s->s3->client_random, 0, 259 sizeof(s->s3->client_random)); 260 D1I(s)->send_cookie = 0; 261 s->internal->hit = 0; 262 } 263 break; 264 265 case SSL3_ST_CW_CLNT_HELLO_A: 266 case SSL3_ST_CW_CLNT_HELLO_B: 267 s->internal->shutdown = 0; 268 269 if (SSL_is_dtls(s)) { 270 /* every DTLS ClientHello resets Finished MAC */ 271 tls1_transcript_reset(s); 272 273 dtls1_start_timer(s); 274 } 275 276 ret = ssl3_send_client_hello(s); 277 if (ret <= 0) 278 goto end; 279 280 if (SSL_is_dtls(s) && D1I(s)->send_cookie) { 281 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 282 S3I(s)->hs.next_state = SSL3_ST_CR_SRVR_HELLO_A; 283 } else 284 S3I(s)->hs.state = SSL3_ST_CR_SRVR_HELLO_A; 285 286 s->internal->init_num = 0; 287 288 /* turn on buffering for the next lot of output */ 289 if (s->bbio != s->wbio) 290 s->wbio = BIO_push(s->bbio, s->wbio); 291 292 break; 293 294 case SSL3_ST_CR_SRVR_HELLO_A: 295 case SSL3_ST_CR_SRVR_HELLO_B: 296 ret = ssl3_get_server_hello(s); 297 if (ret <= 0) 298 goto end; 299 300 if (s->internal->hit) { 301 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 302 if (!SSL_is_dtls(s)) { 303 if (s->internal->tlsext_ticket_expected) { 304 /* receive renewed session ticket */ 305 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 306 } 307 308 /* No client certificate verification. */ 309 tls1_transcript_free(s); 310 } 311 } else if (SSL_is_dtls(s)) { 312 S3I(s)->hs.state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A; 313 } else { 314 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 315 } 316 s->internal->init_num = 0; 317 break; 318 319 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A: 320 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B: 321 ret = ssl3_get_dtls_hello_verify(s); 322 if (ret <= 0) 323 goto end; 324 dtls1_stop_timer(s); 325 if (D1I(s)->send_cookie) /* start again, with a cookie */ 326 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_A; 327 else 328 S3I(s)->hs.state = SSL3_ST_CR_CERT_A; 329 s->internal->init_num = 0; 330 break; 331 332 case SSL3_ST_CR_CERT_A: 333 case SSL3_ST_CR_CERT_B: 334 ret = ssl3_check_finished(s); 335 if (ret <= 0) 336 goto end; 337 if (ret == 2) { 338 s->internal->hit = 1; 339 if (s->internal->tlsext_ticket_expected) 340 S3I(s)->hs.state = SSL3_ST_CR_SESSION_TICKET_A; 341 else 342 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 343 s->internal->init_num = 0; 344 break; 345 } 346 /* Check if it is anon DH/ECDH. */ 347 if (!(S3I(s)->hs.new_cipher->algorithm_auth & 348 SSL_aNULL)) { 349 ret = ssl3_get_server_certificate(s); 350 if (ret <= 0) 351 goto end; 352 if (s->internal->tlsext_status_expected) 353 S3I(s)->hs.state = SSL3_ST_CR_CERT_STATUS_A; 354 else 355 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 356 } else { 357 skip = 1; 358 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 359 } 360 s->internal->init_num = 0; 361 break; 362 363 case SSL3_ST_CR_KEY_EXCH_A: 364 case SSL3_ST_CR_KEY_EXCH_B: 365 ret = ssl3_get_server_key_exchange(s); 366 if (ret <= 0) 367 goto end; 368 S3I(s)->hs.state = SSL3_ST_CR_CERT_REQ_A; 369 s->internal->init_num = 0; 370 371 /* 372 * At this point we check that we have the 373 * required stuff from the server. 374 */ 375 if (!ssl3_check_cert_and_algorithm(s)) { 376 ret = -1; 377 goto end; 378 } 379 break; 380 381 case SSL3_ST_CR_CERT_REQ_A: 382 case SSL3_ST_CR_CERT_REQ_B: 383 ret = ssl3_get_certificate_request(s); 384 if (ret <= 0) 385 goto end; 386 S3I(s)->hs.state = SSL3_ST_CR_SRVR_DONE_A; 387 s->internal->init_num = 0; 388 break; 389 390 case SSL3_ST_CR_SRVR_DONE_A: 391 case SSL3_ST_CR_SRVR_DONE_B: 392 ret = ssl3_get_server_done(s); 393 if (ret <= 0) 394 goto end; 395 if (SSL_is_dtls(s)) 396 dtls1_stop_timer(s); 397 if (S3I(s)->tmp.cert_req) 398 S3I(s)->hs.state = SSL3_ST_CW_CERT_A; 399 else 400 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 401 s->internal->init_num = 0; 402 403 break; 404 405 case SSL3_ST_CW_CERT_A: 406 case SSL3_ST_CW_CERT_B: 407 case SSL3_ST_CW_CERT_C: 408 case SSL3_ST_CW_CERT_D: 409 if (SSL_is_dtls(s)) 410 dtls1_start_timer(s); 411 ret = ssl3_send_client_certificate(s); 412 if (ret <= 0) 413 goto end; 414 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_A; 415 s->internal->init_num = 0; 416 break; 417 418 case SSL3_ST_CW_KEY_EXCH_A: 419 case SSL3_ST_CW_KEY_EXCH_B: 420 if (SSL_is_dtls(s)) 421 dtls1_start_timer(s); 422 ret = ssl3_send_client_key_exchange(s); 423 if (ret <= 0) 424 goto end; 425 /* 426 * EAY EAY EAY need to check for DH fix cert 427 * sent back 428 */ 429 /* 430 * For TLS, cert_req is set to 2, so a cert chain 431 * of nothing is sent, but no verify packet is sent 432 */ 433 /* 434 * XXX: For now, we do not support client 435 * authentication in ECDH cipher suites with 436 * ECDH (rather than ECDSA) certificates. 437 * We need to skip the certificate verify 438 * message when client's ECDH public key is sent 439 * inside the client certificate. 440 */ 441 if (S3I(s)->tmp.cert_req == 1) { 442 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_A; 443 } else { 444 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 445 S3I(s)->change_cipher_spec = 0; 446 } 447 if (!SSL_is_dtls(s)) { 448 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 449 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 450 S3I(s)->change_cipher_spec = 0; 451 } 452 } 453 454 s->internal->init_num = 0; 455 break; 456 457 case SSL3_ST_CW_CERT_VRFY_A: 458 case SSL3_ST_CW_CERT_VRFY_B: 459 if (SSL_is_dtls(s)) 460 dtls1_start_timer(s); 461 ret = ssl3_send_client_verify(s); 462 if (ret <= 0) 463 goto end; 464 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 465 s->internal->init_num = 0; 466 S3I(s)->change_cipher_spec = 0; 467 break; 468 469 case SSL3_ST_CW_CHANGE_A: 470 case SSL3_ST_CW_CHANGE_B: 471 if (SSL_is_dtls(s) && !s->internal->hit) 472 dtls1_start_timer(s); 473 ret = ssl3_send_change_cipher_spec(s, 474 SSL3_ST_CW_CHANGE_A, SSL3_ST_CW_CHANGE_B); 475 if (ret <= 0) 476 goto end; 477 478 S3I(s)->hs.state = SSL3_ST_CW_FINISHED_A; 479 s->internal->init_num = 0; 480 481 s->session->cipher = S3I(s)->hs.new_cipher; 482 if (!tls1_setup_key_block(s)) { 483 ret = -1; 484 goto end; 485 } 486 487 if (!tls1_change_cipher_state(s, 488 SSL3_CHANGE_CIPHER_CLIENT_WRITE)) { 489 ret = -1; 490 goto end; 491 } 492 493 if (SSL_is_dtls(s)) 494 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 495 496 break; 497 498 case SSL3_ST_CW_FINISHED_A: 499 case SSL3_ST_CW_FINISHED_B: 500 if (SSL_is_dtls(s) && !s->internal->hit) 501 dtls1_start_timer(s); 502 ret = ssl3_send_finished(s, SSL3_ST_CW_FINISHED_A, 503 SSL3_ST_CW_FINISHED_B, TLS_MD_CLIENT_FINISH_CONST, 504 TLS_MD_CLIENT_FINISH_CONST_SIZE); 505 if (ret <= 0) 506 goto end; 507 if (!SSL_is_dtls(s)) 508 s->s3->flags |= SSL3_FLAGS_CCS_OK; 509 S3I(s)->hs.state = SSL3_ST_CW_FLUSH; 510 511 /* clear flags */ 512 if (s->internal->hit) { 513 S3I(s)->hs.next_state = SSL_ST_OK; 514 } else { 515 /* Allow NewSessionTicket if ticket expected */ 516 if (s->internal->tlsext_ticket_expected) 517 S3I(s)->hs.next_state = 518 SSL3_ST_CR_SESSION_TICKET_A; 519 else 520 S3I(s)->hs.next_state = 521 SSL3_ST_CR_FINISHED_A; 522 } 523 s->internal->init_num = 0; 524 break; 525 526 case SSL3_ST_CR_SESSION_TICKET_A: 527 case SSL3_ST_CR_SESSION_TICKET_B: 528 ret = ssl3_get_new_session_ticket(s); 529 if (ret <= 0) 530 goto end; 531 S3I(s)->hs.state = SSL3_ST_CR_FINISHED_A; 532 s->internal->init_num = 0; 533 break; 534 535 case SSL3_ST_CR_CERT_STATUS_A: 536 case SSL3_ST_CR_CERT_STATUS_B: 537 ret = ssl3_get_cert_status(s); 538 if (ret <= 0) 539 goto end; 540 S3I(s)->hs.state = SSL3_ST_CR_KEY_EXCH_A; 541 s->internal->init_num = 0; 542 break; 543 544 case SSL3_ST_CR_FINISHED_A: 545 case SSL3_ST_CR_FINISHED_B: 546 if (SSL_is_dtls(s)) 547 D1I(s)->change_cipher_spec_ok = 1; 548 else 549 s->s3->flags |= SSL3_FLAGS_CCS_OK; 550 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A, 551 SSL3_ST_CR_FINISHED_B); 552 if (ret <= 0) 553 goto end; 554 if (SSL_is_dtls(s)) 555 dtls1_stop_timer(s); 556 557 if (s->internal->hit) 558 S3I(s)->hs.state = SSL3_ST_CW_CHANGE_A; 559 else 560 S3I(s)->hs.state = SSL_ST_OK; 561 s->internal->init_num = 0; 562 break; 563 564 case SSL3_ST_CW_FLUSH: 565 s->internal->rwstate = SSL_WRITING; 566 if (BIO_flush(s->wbio) <= 0) { 567 if (SSL_is_dtls(s)) { 568 /* If the write error was fatal, stop trying */ 569 if (!BIO_should_retry(s->wbio)) { 570 s->internal->rwstate = SSL_NOTHING; 571 S3I(s)->hs.state = S3I(s)->hs.next_state; 572 } 573 } 574 ret = -1; 575 goto end; 576 } 577 s->internal->rwstate = SSL_NOTHING; 578 S3I(s)->hs.state = S3I(s)->hs.next_state; 579 break; 580 581 case SSL_ST_OK: 582 /* clean a few things up */ 583 tls1_cleanup_key_block(s); 584 585 if (S3I(s)->handshake_transcript != NULL) { 586 SSLerror(s, ERR_R_INTERNAL_ERROR); 587 ret = -1; 588 goto end; 589 } 590 591 if (!SSL_is_dtls(s)) 592 ssl3_release_init_buffer(s); 593 594 ssl_free_wbio_buffer(s); 595 596 s->internal->init_num = 0; 597 s->internal->renegotiate = 0; 598 s->internal->new_session = 0; 599 600 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 601 if (s->internal->hit) 602 s->ctx->internal->stats.sess_hit++; 603 604 ret = 1; 605 /* s->server=0; */ 606 s->internal->handshake_func = ssl3_connect; 607 s->ctx->internal->stats.sess_connect_good++; 608 609 if (cb != NULL) 610 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 611 612 if (SSL_is_dtls(s)) { 613 /* done with handshaking */ 614 D1I(s)->handshake_read_seq = 0; 615 D1I(s)->next_handshake_write_seq = 0; 616 } 617 618 goto end; 619 /* break; */ 620 621 default: 622 SSLerror(s, SSL_R_UNKNOWN_STATE); 623 ret = -1; 624 goto end; 625 /* break; */ 626 } 627 628 /* did we do anything */ 629 if (!S3I(s)->tmp.reuse_message && !skip) { 630 if (s->internal->debug) { 631 if ((ret = BIO_flush(s->wbio)) <= 0) 632 goto end; 633 } 634 635 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 636 new_state = S3I(s)->hs.state; 637 S3I(s)->hs.state = state; 638 cb(s, SSL_CB_CONNECT_LOOP, 1); 639 S3I(s)->hs.state = new_state; 640 } 641 } 642 skip = 0; 643 } 644 645 end: 646 s->internal->in_handshake--; 647 if (cb != NULL) 648 cb(s, SSL_CB_CONNECT_EXIT, ret); 649 650 return (ret); 651 } 652 653 int 654 ssl3_send_client_hello(SSL *s) 655 { 656 CBB cbb, client_hello, session_id, cookie, cipher_suites; 657 CBB compression_methods; 658 uint16_t max_version; 659 size_t sl; 660 661 memset(&cbb, 0, sizeof(cbb)); 662 663 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 664 SSL_SESSION *sess = s->session; 665 666 if (ssl_supported_version_range(s, NULL, &max_version) != 1) { 667 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 668 return (-1); 669 } 670 s->client_version = s->version = max_version; 671 672 if (sess == NULL || 673 sess->ssl_version != s->version || 674 (!sess->session_id_length && !sess->tlsext_tick) || 675 sess->internal->not_resumable) { 676 if (!ssl_get_new_session(s, 0)) 677 goto err; 678 } 679 /* else use the pre-loaded session */ 680 681 /* 682 * If a DTLS ClientHello message is being resent after a 683 * HelloVerifyRequest, we must retain the original client 684 * random value. 685 */ 686 if (!SSL_is_dtls(s) || D1I(s)->send_cookie == 0) 687 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 688 689 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 690 SSL3_MT_CLIENT_HELLO)) 691 goto err; 692 693 /* 694 * Version indicates the negotiated version: for example from 695 * an SSLv2/v3 compatible client hello). The client_version 696 * field is the maximum version we permit and it is also 697 * used in RSA encrypted premaster secrets. Some servers can 698 * choke if we initially report a higher version then 699 * renegotiate to a lower one in the premaster secret. This 700 * didn't happen with TLS 1.0 as most servers supported it 701 * but it can with TLS 1.1 or later if the server only supports 702 * 1.0. 703 * 704 * Possible scenario with previous logic: 705 * 1. Client hello indicates TLS 1.2 706 * 2. Server hello says TLS 1.0 707 * 3. RSA encrypted premaster secret uses 1.2. 708 * 4. Handhaked proceeds using TLS 1.0. 709 * 5. Server sends hello request to renegotiate. 710 * 6. Client hello indicates TLS v1.0 as we now 711 * know that is maximum server supports. 712 * 7. Server chokes on RSA encrypted premaster secret 713 * containing version 1.0. 714 * 715 * For interoperability it should be OK to always use the 716 * maximum version we support in client hello and then rely 717 * on the checking of version to ensure the servers isn't 718 * being inconsistent: for example initially negotiating with 719 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 720 * client_version in client hello and not resetting it to 721 * the negotiated version. 722 */ 723 if (!CBB_add_u16(&client_hello, s->client_version)) 724 goto err; 725 726 /* Random stuff */ 727 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 728 sizeof(s->s3->client_random))) 729 goto err; 730 731 /* Session ID */ 732 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 733 goto err; 734 if (!s->internal->new_session && 735 s->session->session_id_length > 0) { 736 sl = s->session->session_id_length; 737 if (sl > sizeof(s->session->session_id)) { 738 SSLerror(s, ERR_R_INTERNAL_ERROR); 739 goto err; 740 } 741 if (!CBB_add_bytes(&session_id, 742 s->session->session_id, sl)) 743 goto err; 744 } 745 746 /* DTLS Cookie. */ 747 if (SSL_is_dtls(s)) { 748 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 749 SSLerror(s, ERR_R_INTERNAL_ERROR); 750 goto err; 751 } 752 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 753 goto err; 754 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, 755 D1I(s)->cookie_len)) 756 goto err; 757 } 758 759 /* Ciphers supported */ 760 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 761 return 0; 762 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 763 &cipher_suites)) { 764 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 765 goto err; 766 } 767 768 /* Add in compression methods (null) */ 769 if (!CBB_add_u8_length_prefixed(&client_hello, 770 &compression_methods)) 771 goto err; 772 if (!CBB_add_u8(&compression_methods, 0)) 773 goto err; 774 775 /* TLS extensions */ 776 if (!tlsext_client_build(s, SSL_TLSEXT_MSG_CH, &client_hello)) { 777 SSLerror(s, ERR_R_INTERNAL_ERROR); 778 goto err; 779 } 780 781 if (!ssl3_handshake_msg_finish(s, &cbb)) 782 goto err; 783 784 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 785 } 786 787 /* SSL3_ST_CW_CLNT_HELLO_B */ 788 return (ssl3_handshake_write(s)); 789 790 err: 791 CBB_cleanup(&cbb); 792 793 return (-1); 794 } 795 796 int 797 ssl3_get_dtls_hello_verify(SSL *s) 798 { 799 long n; 800 int al, ok = 0; 801 size_t cookie_len; 802 uint16_t ssl_version; 803 CBS hello_verify_request, cookie; 804 805 n = ssl3_get_message(s, DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A, 806 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B, -1, s->internal->max_cert_list, &ok); 807 if (!ok) 808 return ((int)n); 809 810 if (S3I(s)->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) { 811 D1I(s)->send_cookie = 0; 812 S3I(s)->tmp.reuse_message = 1; 813 return (1); 814 } 815 816 if (n < 0) 817 goto truncated; 818 819 CBS_init(&hello_verify_request, s->internal->init_msg, n); 820 821 if (!CBS_get_u16(&hello_verify_request, &ssl_version)) 822 goto truncated; 823 824 if (ssl_version != s->version) { 825 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 826 s->version = (s->version & 0xff00) | (ssl_version & 0xff); 827 al = SSL_AD_PROTOCOL_VERSION; 828 goto f_err; 829 } 830 831 if (!CBS_get_u8_length_prefixed(&hello_verify_request, &cookie)) 832 goto truncated; 833 834 if (!CBS_write_bytes(&cookie, D1I(s)->cookie, 835 sizeof(D1I(s)->cookie), &cookie_len)) { 836 D1I(s)->cookie_len = 0; 837 al = SSL_AD_ILLEGAL_PARAMETER; 838 goto f_err; 839 } 840 D1I(s)->cookie_len = cookie_len; 841 D1I(s)->send_cookie = 1; 842 843 return 1; 844 845 truncated: 846 al = SSL_AD_DECODE_ERROR; 847 f_err: 848 ssl3_send_alert(s, SSL3_AL_FATAL, al); 849 return -1; 850 } 851 852 int 853 ssl3_get_server_hello(SSL *s) 854 { 855 CBS cbs, server_random, session_id; 856 uint16_t server_version, cipher_suite; 857 uint16_t min_version, max_version; 858 uint8_t compression_method; 859 const SSL_CIPHER *cipher; 860 const SSL_METHOD *method; 861 unsigned long alg_k; 862 size_t outlen; 863 int al, ok; 864 long n; 865 866 s->internal->first_packet = 1; 867 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 868 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 869 if (!ok) 870 return ((int)n); 871 s->internal->first_packet = 0; 872 873 if (n < 0) 874 goto truncated; 875 876 CBS_init(&cbs, s->internal->init_msg, n); 877 878 if (SSL_is_dtls(s)) { 879 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 880 if (D1I(s)->send_cookie == 0) { 881 S3I(s)->tmp.reuse_message = 1; 882 return (1); 883 } else { 884 /* Already sent a cookie. */ 885 al = SSL_AD_UNEXPECTED_MESSAGE; 886 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 887 goto f_err; 888 } 889 } 890 } 891 892 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) { 893 al = SSL_AD_UNEXPECTED_MESSAGE; 894 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 895 goto f_err; 896 } 897 898 if (!CBS_get_u16(&cbs, &server_version)) 899 goto truncated; 900 901 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) { 902 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 903 goto err; 904 } 905 906 if (server_version < min_version || server_version > max_version) { 907 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 908 s->version = (s->version & 0xff00) | (server_version & 0xff); 909 al = SSL_AD_PROTOCOL_VERSION; 910 goto f_err; 911 } 912 s->version = server_version; 913 914 if ((method = ssl_get_method(server_version)) == NULL) { 915 SSLerror(s, ERR_R_INTERNAL_ERROR); 916 goto err; 917 } 918 s->method = method; 919 920 /* Server random. */ 921 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 922 goto truncated; 923 if (!CBS_write_bytes(&server_random, s->s3->server_random, 924 sizeof(s->s3->server_random), NULL)) 925 goto err; 926 927 if (!ssl_downgrade_max_version(s, &max_version)) 928 goto err; 929 if (!SSL_is_dtls(s) && max_version >= TLS1_2_VERSION && 930 s->version < max_version) { 931 /* 932 * RFC 8446 section 4.1.3. We must not downgrade if the server 933 * random value contains the TLS 1.2 or TLS 1.1 magical value. 934 */ 935 if (!CBS_skip(&server_random, 936 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 937 goto err; 938 if (s->version == TLS1_2_VERSION && 939 CBS_mem_equal(&server_random, tls13_downgrade_12, 940 sizeof(tls13_downgrade_12))) { 941 al = SSL_AD_ILLEGAL_PARAMETER; 942 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 943 goto f_err; 944 } 945 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 946 sizeof(tls13_downgrade_11))) { 947 al = SSL_AD_ILLEGAL_PARAMETER; 948 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 949 goto f_err; 950 } 951 } 952 953 /* Session ID. */ 954 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 955 goto truncated; 956 957 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 958 al = SSL_AD_ILLEGAL_PARAMETER; 959 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 960 goto f_err; 961 } 962 963 /* Cipher suite. */ 964 if (!CBS_get_u16(&cbs, &cipher_suite)) 965 goto truncated; 966 967 /* 968 * Check if we want to resume the session based on external 969 * pre-shared secret. 970 */ 971 if (s->internal->tls_session_secret_cb) { 972 SSL_CIPHER *pref_cipher = NULL; 973 s->session->master_key_length = sizeof(s->session->master_key); 974 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 975 &s->session->master_key_length, NULL, &pref_cipher, 976 s->internal->tls_session_secret_cb_arg)) { 977 s->session->cipher = pref_cipher ? pref_cipher : 978 ssl3_get_cipher_by_value(cipher_suite); 979 s->s3->flags |= SSL3_FLAGS_CCS_OK; 980 } 981 } 982 983 if (s->session->session_id_length != 0 && 984 CBS_mem_equal(&session_id, s->session->session_id, 985 s->session->session_id_length)) { 986 if (s->sid_ctx_length != s->session->sid_ctx_length || 987 timingsafe_memcmp(s->session->sid_ctx, 988 s->sid_ctx, s->sid_ctx_length) != 0) { 989 /* actually a client application bug */ 990 al = SSL_AD_ILLEGAL_PARAMETER; 991 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 992 goto f_err; 993 } 994 s->s3->flags |= SSL3_FLAGS_CCS_OK; 995 s->internal->hit = 1; 996 } else { 997 /* a miss or crap from the other end */ 998 999 /* If we were trying for session-id reuse, make a new 1000 * SSL_SESSION so we don't stuff up other people */ 1001 s->internal->hit = 0; 1002 if (s->session->session_id_length > 0) { 1003 if (!ssl_get_new_session(s, 0)) { 1004 al = SSL_AD_INTERNAL_ERROR; 1005 goto f_err; 1006 } 1007 } 1008 1009 /* 1010 * XXX - improve the handling for the case where there is a 1011 * zero length session identifier. 1012 */ 1013 if (!CBS_write_bytes(&session_id, s->session->session_id, 1014 sizeof(s->session->session_id), &outlen)) 1015 goto err; 1016 s->session->session_id_length = outlen; 1017 1018 s->session->ssl_version = s->version; 1019 } 1020 1021 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 1022 al = SSL_AD_ILLEGAL_PARAMETER; 1023 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 1024 goto f_err; 1025 } 1026 1027 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 1028 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 1029 (TLS1_get_version(s) < TLS1_2_VERSION)) { 1030 al = SSL_AD_ILLEGAL_PARAMETER; 1031 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1032 goto f_err; 1033 } 1034 1035 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 1036 /* we did not say we would use this cipher */ 1037 al = SSL_AD_ILLEGAL_PARAMETER; 1038 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 1039 goto f_err; 1040 } 1041 1042 /* 1043 * Depending on the session caching (internal/external), the cipher 1044 * and/or cipher_id values may not be set. Make sure that 1045 * cipher_id is set and use it for comparison. 1046 */ 1047 if (s->session->cipher) 1048 s->session->cipher_id = s->session->cipher->id; 1049 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1050 al = SSL_AD_ILLEGAL_PARAMETER; 1051 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1052 goto f_err; 1053 } 1054 S3I(s)->hs.new_cipher = cipher; 1055 1056 if (!tls1_transcript_hash_init(s)) 1057 goto err; 1058 1059 /* 1060 * Don't digest cached records if no sigalgs: we may need them for 1061 * client authentication. 1062 */ 1063 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1064 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1065 tls1_transcript_free(s); 1066 1067 if (!CBS_get_u8(&cbs, &compression_method)) 1068 goto truncated; 1069 1070 if (compression_method != 0) { 1071 al = SSL_AD_ILLEGAL_PARAMETER; 1072 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1073 goto f_err; 1074 } 1075 1076 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1077 SSLerror(s, SSL_R_PARSE_TLSEXT); 1078 goto f_err; 1079 } 1080 1081 /* 1082 * Determine if we need to see RI. Strictly speaking if we want to 1083 * avoid an attack we should *always* see RI even on initial server 1084 * hello because the client doesn't see any renegotiation during an 1085 * attack. However this would mean we could not connect to any server 1086 * which doesn't support RI so for the immediate future tolerate RI 1087 * absence on initial connect only. 1088 */ 1089 if (!S3I(s)->renegotiate_seen && 1090 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1091 al = SSL_AD_HANDSHAKE_FAILURE; 1092 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1093 goto f_err; 1094 } 1095 1096 if (ssl_check_serverhello_tlsext(s) <= 0) { 1097 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1098 goto err; 1099 } 1100 1101 return (1); 1102 1103 truncated: 1104 /* wrong packet length */ 1105 al = SSL_AD_DECODE_ERROR; 1106 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1107 f_err: 1108 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1109 err: 1110 return (-1); 1111 } 1112 1113 int 1114 ssl3_get_server_certificate(SSL *s) 1115 { 1116 int al, i, ok, ret = -1; 1117 long n; 1118 CBS cbs, cert_list; 1119 X509 *x = NULL; 1120 const unsigned char *q; 1121 STACK_OF(X509) *sk = NULL; 1122 SESS_CERT *sc; 1123 EVP_PKEY *pkey = NULL; 1124 1125 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1126 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1127 if (!ok) 1128 return ((int)n); 1129 1130 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1131 S3I(s)->tmp.reuse_message = 1; 1132 return (1); 1133 } 1134 1135 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1136 al = SSL_AD_UNEXPECTED_MESSAGE; 1137 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1138 goto f_err; 1139 } 1140 1141 1142 if ((sk = sk_X509_new_null()) == NULL) { 1143 SSLerror(s, ERR_R_MALLOC_FAILURE); 1144 goto err; 1145 } 1146 1147 if (n < 0) 1148 goto truncated; 1149 1150 CBS_init(&cbs, s->internal->init_msg, n); 1151 if (CBS_len(&cbs) < 3) 1152 goto truncated; 1153 1154 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1155 CBS_len(&cbs) != 0) { 1156 al = SSL_AD_DECODE_ERROR; 1157 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1158 goto f_err; 1159 } 1160 1161 while (CBS_len(&cert_list) > 0) { 1162 CBS cert; 1163 1164 if (CBS_len(&cert_list) < 3) 1165 goto truncated; 1166 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1167 al = SSL_AD_DECODE_ERROR; 1168 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1169 goto f_err; 1170 } 1171 1172 q = CBS_data(&cert); 1173 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1174 if (x == NULL) { 1175 al = SSL_AD_BAD_CERTIFICATE; 1176 SSLerror(s, ERR_R_ASN1_LIB); 1177 goto f_err; 1178 } 1179 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1180 al = SSL_AD_DECODE_ERROR; 1181 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1182 goto f_err; 1183 } 1184 if (!sk_X509_push(sk, x)) { 1185 SSLerror(s, ERR_R_MALLOC_FAILURE); 1186 goto err; 1187 } 1188 x = NULL; 1189 } 1190 1191 i = ssl_verify_cert_chain(s, sk); 1192 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1193 al = ssl_verify_alarm_type(s->verify_result); 1194 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1195 goto f_err; 1196 1197 } 1198 ERR_clear_error(); /* but we keep s->verify_result */ 1199 1200 sc = ssl_sess_cert_new(); 1201 if (sc == NULL) 1202 goto err; 1203 ssl_sess_cert_free(SSI(s)->sess_cert); 1204 SSI(s)->sess_cert = sc; 1205 1206 sc->cert_chain = sk; 1207 /* 1208 * Inconsistency alert: cert_chain does include the peer's 1209 * certificate, which we don't include in s3_srvr.c 1210 */ 1211 x = sk_X509_value(sk, 0); 1212 sk = NULL; 1213 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1214 1215 pkey = X509_get_pubkey(x); 1216 1217 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1218 x = NULL; 1219 al = SSL3_AL_FATAL; 1220 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1221 goto f_err; 1222 } 1223 1224 i = ssl_cert_type(x, pkey); 1225 if (i < 0) { 1226 x = NULL; 1227 al = SSL3_AL_FATAL; 1228 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1229 goto f_err; 1230 } 1231 1232 sc->peer_cert_type = i; 1233 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1234 /* 1235 * Why would the following ever happen? 1236 * We just created sc a couple of lines ago. 1237 */ 1238 X509_free(sc->peer_pkeys[i].x509); 1239 sc->peer_pkeys[i].x509 = x; 1240 sc->peer_key = &(sc->peer_pkeys[i]); 1241 1242 X509_free(s->session->peer); 1243 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1244 s->session->peer = x; 1245 s->session->verify_result = s->verify_result; 1246 1247 x = NULL; 1248 ret = 1; 1249 1250 if (0) { 1251 truncated: 1252 /* wrong packet length */ 1253 al = SSL_AD_DECODE_ERROR; 1254 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1255 f_err: 1256 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1257 } 1258 err: 1259 EVP_PKEY_free(pkey); 1260 X509_free(x); 1261 sk_X509_pop_free(sk, X509_free); 1262 1263 return (ret); 1264 } 1265 1266 static int 1267 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1268 { 1269 CBS dhp, dhg, dhpk; 1270 BN_CTX *bn_ctx = NULL; 1271 SESS_CERT *sc = NULL; 1272 DH *dh = NULL; 1273 long alg_a; 1274 int al; 1275 1276 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1277 sc = SSI(s)->sess_cert; 1278 1279 if ((dh = DH_new()) == NULL) { 1280 SSLerror(s, ERR_R_DH_LIB); 1281 goto err; 1282 } 1283 1284 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1285 goto truncated; 1286 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1287 SSLerror(s, ERR_R_BN_LIB); 1288 goto err; 1289 } 1290 1291 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1292 goto truncated; 1293 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1294 SSLerror(s, ERR_R_BN_LIB); 1295 goto err; 1296 } 1297 1298 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1299 goto truncated; 1300 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1301 NULL)) == NULL) { 1302 SSLerror(s, ERR_R_BN_LIB); 1303 goto err; 1304 } 1305 1306 /* 1307 * Check the strength of the DH key just constructed. 1308 * Discard keys weaker than 1024 bits. 1309 */ 1310 if (DH_size(dh) < 1024 / 8) { 1311 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1312 goto err; 1313 } 1314 1315 if (alg_a & SSL_aRSA) 1316 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1317 else 1318 /* XXX - Anonymous DH, so no certificate or pkey. */ 1319 *pkey = NULL; 1320 1321 sc->peer_dh_tmp = dh; 1322 1323 return (1); 1324 1325 truncated: 1326 al = SSL_AD_DECODE_ERROR; 1327 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1328 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1329 1330 err: 1331 DH_free(dh); 1332 BN_CTX_free(bn_ctx); 1333 1334 return (-1); 1335 } 1336 1337 static int 1338 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1339 { 1340 EC_KEY *ecdh = NULL; 1341 int ret = -1; 1342 1343 /* Extract the server's ephemeral ECDH public key. */ 1344 if ((ecdh = EC_KEY_new()) == NULL) { 1345 SSLerror(s, ERR_R_MALLOC_FAILURE); 1346 goto err; 1347 } 1348 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1349 SSLerror(s, SSL_R_BAD_ECPOINT); 1350 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1351 goto err; 1352 } 1353 1354 sc->peer_nid = nid; 1355 sc->peer_ecdh_tmp = ecdh; 1356 ecdh = NULL; 1357 1358 ret = 1; 1359 1360 err: 1361 EC_KEY_free(ecdh); 1362 1363 return (ret); 1364 } 1365 1366 static int 1367 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1368 { 1369 size_t outlen; 1370 1371 if (nid != NID_X25519) { 1372 SSLerror(s, ERR_R_INTERNAL_ERROR); 1373 goto err; 1374 } 1375 1376 if (CBS_len(public) != X25519_KEY_LENGTH) { 1377 SSLerror(s, SSL_R_BAD_ECPOINT); 1378 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1379 goto err; 1380 } 1381 1382 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1383 SSLerror(s, ERR_R_MALLOC_FAILURE); 1384 goto err; 1385 } 1386 1387 return (1); 1388 1389 err: 1390 return (-1); 1391 } 1392 1393 static int 1394 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1395 { 1396 CBS public; 1397 uint8_t curve_type; 1398 uint16_t curve_id; 1399 SESS_CERT *sc; 1400 long alg_a; 1401 int nid; 1402 int al; 1403 1404 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1405 sc = SSI(s)->sess_cert; 1406 1407 /* Only named curves are supported. */ 1408 if (!CBS_get_u8(cbs, &curve_type) || 1409 curve_type != NAMED_CURVE_TYPE || 1410 !CBS_get_u16(cbs, &curve_id)) { 1411 al = SSL_AD_DECODE_ERROR; 1412 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1413 goto f_err; 1414 } 1415 1416 /* 1417 * Check that the curve is one of our preferences - if it is not, 1418 * the server has sent us an invalid curve. 1419 */ 1420 if (tls1_check_curve(s, curve_id) != 1) { 1421 al = SSL_AD_DECODE_ERROR; 1422 SSLerror(s, SSL_R_WRONG_CURVE); 1423 goto f_err; 1424 } 1425 1426 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1427 al = SSL_AD_INTERNAL_ERROR; 1428 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1429 goto f_err; 1430 } 1431 1432 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1433 goto truncated; 1434 1435 if (nid == NID_X25519) { 1436 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1437 goto err; 1438 } else { 1439 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1440 goto err; 1441 } 1442 1443 /* 1444 * The ECC/TLS specification does not mention the use of DSA to sign 1445 * ECParameters in the server key exchange message. We do support RSA 1446 * and ECDSA. 1447 */ 1448 if (alg_a & SSL_aRSA) 1449 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1450 else if (alg_a & SSL_aECDSA) 1451 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1452 else 1453 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1454 *pkey = NULL; 1455 1456 return (1); 1457 1458 truncated: 1459 al = SSL_AD_DECODE_ERROR; 1460 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1461 1462 f_err: 1463 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1464 1465 err: 1466 return (-1); 1467 } 1468 1469 int 1470 ssl3_get_server_key_exchange(SSL *s) 1471 { 1472 CBS cbs, signature; 1473 const EVP_MD *md = NULL; 1474 EVP_PKEY *pkey = NULL; 1475 EVP_MD_CTX md_ctx; 1476 const unsigned char *param; 1477 long n, alg_k, alg_a; 1478 int al, ok; 1479 size_t param_len; 1480 1481 EVP_MD_CTX_init(&md_ctx); 1482 1483 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1484 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1485 1486 /* 1487 * Use same message size as in ssl3_get_certificate_request() 1488 * as ServerKeyExchange message may be skipped. 1489 */ 1490 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1491 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1492 if (!ok) 1493 return ((int)n); 1494 1495 if (n < 0) 1496 goto err; 1497 1498 CBS_init(&cbs, s->internal->init_msg, n); 1499 1500 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1501 /* 1502 * Do not skip server key exchange if this cipher suite uses 1503 * ephemeral keys. 1504 */ 1505 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1506 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1507 al = SSL_AD_UNEXPECTED_MESSAGE; 1508 goto f_err; 1509 } 1510 1511 S3I(s)->tmp.reuse_message = 1; 1512 EVP_MD_CTX_cleanup(&md_ctx); 1513 return (1); 1514 } 1515 1516 if (SSI(s)->sess_cert != NULL) { 1517 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1518 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1519 1520 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1521 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1522 1523 free(SSI(s)->sess_cert->peer_x25519_tmp); 1524 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1525 } else { 1526 SSI(s)->sess_cert = ssl_sess_cert_new(); 1527 if (SSI(s)->sess_cert == NULL) 1528 goto err; 1529 } 1530 1531 param = CBS_data(&cbs); 1532 param_len = CBS_len(&cbs); 1533 1534 if (alg_k & SSL_kDHE) { 1535 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1536 goto err; 1537 } else if (alg_k & SSL_kECDHE) { 1538 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1539 goto err; 1540 } else if (alg_k != 0) { 1541 al = SSL_AD_UNEXPECTED_MESSAGE; 1542 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1543 goto f_err; 1544 } 1545 1546 param_len -= CBS_len(&cbs); 1547 1548 /* if it was signed, check the signature */ 1549 if (pkey != NULL) { 1550 EVP_PKEY_CTX *pctx; 1551 const struct ssl_sigalg *sigalg; 1552 1553 if (SSL_USE_SIGALGS(s)) { 1554 uint16_t sigalg_value; 1555 1556 if (!CBS_get_u16(&cbs, &sigalg_value)) 1557 goto truncated; 1558 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1559 tls12_sigalgs_len)) == NULL) { 1560 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1561 al = SSL_AD_DECODE_ERROR; 1562 goto f_err; 1563 } 1564 if ((md = sigalg->md()) == NULL) { 1565 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1566 al = SSL_AD_DECODE_ERROR; 1567 goto f_err; 1568 } 1569 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 1570 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1571 al = SSL_AD_DECODE_ERROR; 1572 goto f_err; 1573 } 1574 } else if (pkey->type == EVP_PKEY_RSA) { 1575 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1576 } else if (pkey->type == EVP_PKEY_EC) { 1577 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1578 } else { 1579 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1580 al = SSL_AD_DECODE_ERROR; 1581 goto f_err; 1582 } 1583 md = sigalg->md(); 1584 1585 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1586 goto truncated; 1587 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1588 al = SSL_AD_DECODE_ERROR; 1589 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1590 goto f_err; 1591 } 1592 1593 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1594 goto err; 1595 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1596 SSL3_RANDOM_SIZE)) 1597 goto err; 1598 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1599 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1600 RSA_PKCS1_PSS_PADDING) || 1601 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1602 goto err; 1603 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1604 SSL3_RANDOM_SIZE)) 1605 goto err; 1606 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1607 goto err; 1608 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1609 CBS_len(&signature)) <= 0) { 1610 al = SSL_AD_DECRYPT_ERROR; 1611 SSLerror(s, SSL_R_BAD_SIGNATURE); 1612 goto f_err; 1613 } 1614 } else { 1615 /* aNULL does not need public keys. */ 1616 if (!(alg_a & SSL_aNULL)) { 1617 SSLerror(s, ERR_R_INTERNAL_ERROR); 1618 goto err; 1619 } 1620 } 1621 1622 if (CBS_len(&cbs) != 0) { 1623 al = SSL_AD_DECODE_ERROR; 1624 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1625 goto f_err; 1626 } 1627 1628 EVP_PKEY_free(pkey); 1629 EVP_MD_CTX_cleanup(&md_ctx); 1630 1631 return (1); 1632 1633 truncated: 1634 al = SSL_AD_DECODE_ERROR; 1635 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1636 1637 f_err: 1638 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1639 1640 err: 1641 EVP_PKEY_free(pkey); 1642 EVP_MD_CTX_cleanup(&md_ctx); 1643 1644 return (-1); 1645 } 1646 1647 int 1648 ssl3_get_certificate_request(SSL *s) 1649 { 1650 int ok, ret = 0; 1651 long n; 1652 uint8_t ctype_num; 1653 CBS cert_request, ctypes, rdn_list; 1654 X509_NAME *xn = NULL; 1655 const unsigned char *q; 1656 STACK_OF(X509_NAME) *ca_sk = NULL; 1657 1658 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1659 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1660 if (!ok) 1661 return ((int)n); 1662 1663 S3I(s)->tmp.cert_req = 0; 1664 1665 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1666 S3I(s)->tmp.reuse_message = 1; 1667 /* 1668 * If we get here we don't need any cached handshake records 1669 * as we wont be doing client auth. 1670 */ 1671 tls1_transcript_free(s); 1672 return (1); 1673 } 1674 1675 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1676 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1677 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1678 goto err; 1679 } 1680 1681 /* TLS does not like anon-DH with client cert */ 1682 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1683 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1684 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1685 goto err; 1686 } 1687 1688 if (n < 0) 1689 goto truncated; 1690 CBS_init(&cert_request, s->internal->init_msg, n); 1691 1692 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1693 SSLerror(s, ERR_R_MALLOC_FAILURE); 1694 goto err; 1695 } 1696 1697 /* get the certificate types */ 1698 if (!CBS_get_u8(&cert_request, &ctype_num)) 1699 goto truncated; 1700 1701 if (ctype_num > SSL3_CT_NUMBER) 1702 ctype_num = SSL3_CT_NUMBER; 1703 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1704 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1705 sizeof(S3I(s)->tmp.ctype), NULL)) { 1706 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1707 goto err; 1708 } 1709 1710 if (SSL_USE_SIGALGS(s)) { 1711 CBS sigalgs; 1712 1713 if (CBS_len(&cert_request) < 2) { 1714 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1715 goto err; 1716 } 1717 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1718 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1719 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1720 goto err; 1721 } 1722 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1723 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1724 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1725 goto err; 1726 } 1727 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1728 &S3I(s)->hs.sigalgs_len)) 1729 goto err; 1730 } 1731 1732 /* get the CA RDNs */ 1733 if (CBS_len(&cert_request) < 2) { 1734 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1735 goto err; 1736 } 1737 1738 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1739 CBS_len(&cert_request) != 0) { 1740 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1741 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1742 goto err; 1743 } 1744 1745 while (CBS_len(&rdn_list) > 0) { 1746 CBS rdn; 1747 1748 if (CBS_len(&rdn_list) < 2) { 1749 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1750 goto err; 1751 } 1752 1753 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1754 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1755 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1756 goto err; 1757 } 1758 1759 q = CBS_data(&rdn); 1760 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1761 ssl3_send_alert(s, SSL3_AL_FATAL, 1762 SSL_AD_DECODE_ERROR); 1763 SSLerror(s, ERR_R_ASN1_LIB); 1764 goto err; 1765 } 1766 1767 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1768 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1769 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1770 goto err; 1771 } 1772 if (!sk_X509_NAME_push(ca_sk, xn)) { 1773 SSLerror(s, ERR_R_MALLOC_FAILURE); 1774 goto err; 1775 } 1776 xn = NULL; /* avoid free in err block */ 1777 } 1778 1779 /* we should setup a certificate to return.... */ 1780 S3I(s)->tmp.cert_req = 1; 1781 S3I(s)->tmp.ctype_num = ctype_num; 1782 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1783 S3I(s)->tmp.ca_names = ca_sk; 1784 ca_sk = NULL; 1785 1786 ret = 1; 1787 if (0) { 1788 truncated: 1789 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1790 } 1791 err: 1792 X509_NAME_free(xn); 1793 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1794 return (ret); 1795 } 1796 1797 static int 1798 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1799 { 1800 return (X509_NAME_cmp(*a, *b)); 1801 } 1802 1803 int 1804 ssl3_get_new_session_ticket(SSL *s) 1805 { 1806 int ok, al, ret = 0; 1807 uint32_t lifetime_hint; 1808 long n; 1809 CBS cbs, session_ticket; 1810 1811 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1812 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1813 if (!ok) 1814 return ((int)n); 1815 1816 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1817 S3I(s)->tmp.reuse_message = 1; 1818 return (1); 1819 } 1820 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1821 al = SSL_AD_UNEXPECTED_MESSAGE; 1822 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1823 goto f_err; 1824 } 1825 1826 if (n < 0) { 1827 al = SSL_AD_DECODE_ERROR; 1828 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1829 goto f_err; 1830 } 1831 1832 CBS_init(&cbs, s->internal->init_msg, n); 1833 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1834 #if UINT32_MAX > LONG_MAX 1835 lifetime_hint > LONG_MAX || 1836 #endif 1837 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1838 CBS_len(&cbs) != 0) { 1839 al = SSL_AD_DECODE_ERROR; 1840 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1841 goto f_err; 1842 } 1843 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1844 1845 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1846 &s->session->tlsext_ticklen)) { 1847 SSLerror(s, ERR_R_MALLOC_FAILURE); 1848 goto err; 1849 } 1850 1851 /* 1852 * There are two ways to detect a resumed ticket sesion. 1853 * One is to set an appropriate session ID and then the server 1854 * must return a match in ServerHello. This allows the normal 1855 * client session ID matching to work and we know much 1856 * earlier that the ticket has been accepted. 1857 * 1858 * The other way is to set zero length session ID when the 1859 * ticket is presented and rely on the handshake to determine 1860 * session resumption. 1861 * 1862 * We choose the former approach because this fits in with 1863 * assumptions elsewhere in OpenSSL. The session ID is set 1864 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1865 * ticket. 1866 */ 1867 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1868 s->session->session_id, &s->session->session_id_length, 1869 EVP_sha256(), NULL); 1870 ret = 1; 1871 return (ret); 1872 f_err: 1873 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1874 err: 1875 return (-1); 1876 } 1877 1878 int 1879 ssl3_get_cert_status(SSL *s) 1880 { 1881 CBS cert_status, response; 1882 int ok, al; 1883 long n; 1884 uint8_t status_type; 1885 1886 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1887 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1888 16384, &ok); 1889 if (!ok) 1890 return ((int)n); 1891 1892 if (n < 0) { 1893 /* need at least status type + length */ 1894 al = SSL_AD_DECODE_ERROR; 1895 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1896 goto f_err; 1897 } 1898 1899 CBS_init(&cert_status, s->internal->init_msg, n); 1900 if (!CBS_get_u8(&cert_status, &status_type) || 1901 CBS_len(&cert_status) < 3) { 1902 /* need at least status type + length */ 1903 al = SSL_AD_DECODE_ERROR; 1904 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1905 goto f_err; 1906 } 1907 1908 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1909 al = SSL_AD_DECODE_ERROR; 1910 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1911 goto f_err; 1912 } 1913 1914 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1915 CBS_len(&cert_status) != 0) { 1916 al = SSL_AD_DECODE_ERROR; 1917 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1918 goto f_err; 1919 } 1920 1921 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1922 &s->internal->tlsext_ocsp_resp_len)) { 1923 al = SSL_AD_INTERNAL_ERROR; 1924 SSLerror(s, ERR_R_MALLOC_FAILURE); 1925 goto f_err; 1926 } 1927 1928 if (s->ctx->internal->tlsext_status_cb) { 1929 int ret; 1930 ret = s->ctx->internal->tlsext_status_cb(s, 1931 s->ctx->internal->tlsext_status_arg); 1932 if (ret == 0) { 1933 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1934 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1935 goto f_err; 1936 } 1937 if (ret < 0) { 1938 al = SSL_AD_INTERNAL_ERROR; 1939 SSLerror(s, ERR_R_MALLOC_FAILURE); 1940 goto f_err; 1941 } 1942 } 1943 return (1); 1944 f_err: 1945 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1946 return (-1); 1947 } 1948 1949 int 1950 ssl3_get_server_done(SSL *s) 1951 { 1952 int ok, ret = 0; 1953 long n; 1954 1955 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1956 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1957 30, /* should be very small, like 0 :-) */ &ok); 1958 if (!ok) 1959 return ((int)n); 1960 1961 if (n > 0) { 1962 /* should contain no data */ 1963 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1964 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1965 return (-1); 1966 } 1967 ret = 1; 1968 return (ret); 1969 } 1970 1971 static int 1972 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1973 { 1974 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1975 unsigned char *enc_pms = NULL; 1976 EVP_PKEY *pkey = NULL; 1977 int ret = -1; 1978 int enc_len; 1979 CBB epms; 1980 1981 /* 1982 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1983 */ 1984 1985 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1986 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1987 pkey->pkey.rsa == NULL) { 1988 SSLerror(s, ERR_R_INTERNAL_ERROR); 1989 goto err; 1990 } 1991 1992 pms[0] = s->client_version >> 8; 1993 pms[1] = s->client_version & 0xff; 1994 arc4random_buf(&pms[2], sizeof(pms) - 2); 1995 1996 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1997 SSLerror(s, ERR_R_MALLOC_FAILURE); 1998 goto err; 1999 } 2000 2001 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 2002 RSA_PKCS1_PADDING); 2003 if (enc_len <= 0) { 2004 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 2005 goto err; 2006 } 2007 2008 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 2009 goto err; 2010 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 2011 goto err; 2012 if (!CBB_flush(cbb)) 2013 goto err; 2014 2015 s->session->master_key_length = 2016 tls1_generate_master_secret(s, 2017 s->session->master_key, pms, sizeof(pms)); 2018 2019 ret = 1; 2020 2021 err: 2022 explicit_bzero(pms, sizeof(pms)); 2023 EVP_PKEY_free(pkey); 2024 free(enc_pms); 2025 2026 return (ret); 2027 } 2028 2029 static int 2030 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2031 { 2032 DH *dh_srvr = NULL, *dh_clnt = NULL; 2033 unsigned char *key = NULL; 2034 int key_size = 0, key_len; 2035 unsigned char *data; 2036 int ret = -1; 2037 CBB dh_Yc; 2038 2039 /* Ensure that we have an ephemeral key for DHE. */ 2040 if (sess_cert->peer_dh_tmp == NULL) { 2041 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2042 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 2043 goto err; 2044 } 2045 dh_srvr = sess_cert->peer_dh_tmp; 2046 2047 /* Generate a new random key. */ 2048 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2049 SSLerror(s, ERR_R_DH_LIB); 2050 goto err; 2051 } 2052 if (!DH_generate_key(dh_clnt)) { 2053 SSLerror(s, ERR_R_DH_LIB); 2054 goto err; 2055 } 2056 if ((key_size = DH_size(dh_clnt)) <= 0) { 2057 SSLerror(s, ERR_R_DH_LIB); 2058 goto err; 2059 } 2060 if ((key = malloc(key_size)) == NULL) { 2061 SSLerror(s, ERR_R_MALLOC_FAILURE); 2062 goto err; 2063 } 2064 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2065 SSLerror(s, ERR_R_DH_LIB); 2066 goto err; 2067 } 2068 2069 /* Generate master key from the result. */ 2070 s->session->master_key_length = 2071 tls1_generate_master_secret(s, 2072 s->session->master_key, key, key_len); 2073 2074 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2075 goto err; 2076 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2077 goto err; 2078 BN_bn2bin(dh_clnt->pub_key, data); 2079 if (!CBB_flush(cbb)) 2080 goto err; 2081 2082 ret = 1; 2083 2084 err: 2085 DH_free(dh_clnt); 2086 freezero(key, key_size); 2087 2088 return (ret); 2089 } 2090 2091 static int 2092 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2093 { 2094 EC_KEY *ecdh = NULL; 2095 uint8_t *key = NULL; 2096 size_t key_len = 0; 2097 int ret = -1; 2098 CBB ecpoint; 2099 2100 if ((ecdh = EC_KEY_new()) == NULL) { 2101 SSLerror(s, ERR_R_MALLOC_FAILURE); 2102 goto err; 2103 } 2104 2105 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2106 goto err; 2107 2108 /* Encode our public key. */ 2109 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2110 goto err; 2111 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2112 goto err; 2113 if (!CBB_flush(cbb)) 2114 goto err; 2115 2116 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2117 goto err; 2118 s->session->master_key_length = tls1_generate_master_secret(s, 2119 s->session->master_key, key, key_len); 2120 2121 ret = 1; 2122 2123 err: 2124 freezero(key, key_len); 2125 EC_KEY_free(ecdh); 2126 2127 return (ret); 2128 } 2129 2130 static int 2131 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2132 { 2133 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2134 int ret = -1; 2135 CBB ecpoint; 2136 2137 /* Generate X25519 key pair and derive shared key. */ 2138 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2139 goto err; 2140 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2141 goto err; 2142 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2143 goto err; 2144 X25519_keypair(public_key, private_key); 2145 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2146 goto err; 2147 2148 /* Serialize the public key. */ 2149 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2150 goto err; 2151 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2152 goto err; 2153 if (!CBB_flush(cbb)) 2154 goto err; 2155 2156 /* Generate master key from the result. */ 2157 s->session->master_key_length = 2158 tls1_generate_master_secret(s, 2159 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2160 2161 ret = 1; 2162 2163 err: 2164 free(public_key); 2165 freezero(private_key, X25519_KEY_LENGTH); 2166 freezero(shared_key, X25519_KEY_LENGTH); 2167 2168 return (ret); 2169 } 2170 2171 static int 2172 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2173 { 2174 if (sc->peer_x25519_tmp != NULL) { 2175 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2176 goto err; 2177 } else if (sc->peer_ecdh_tmp != NULL) { 2178 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2179 goto err; 2180 } else { 2181 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2182 SSLerror(s, ERR_R_INTERNAL_ERROR); 2183 goto err; 2184 } 2185 2186 return (1); 2187 2188 err: 2189 return (-1); 2190 } 2191 2192 static int 2193 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2194 { 2195 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2196 EVP_PKEY *pub_key = NULL; 2197 EVP_PKEY_CTX *pkey_ctx; 2198 X509 *peer_cert; 2199 size_t msglen; 2200 unsigned int md_len; 2201 EVP_MD_CTX *ukm_hash; 2202 int ret = -1; 2203 int nid; 2204 CBB gostblob; 2205 2206 /* Get server sertificate PKEY and create ctx from it */ 2207 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2208 if (peer_cert == NULL) { 2209 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2210 goto err; 2211 } 2212 2213 pub_key = X509_get_pubkey(peer_cert); 2214 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2215 2216 /* 2217 * If we have send a certificate, and certificate key parameters match 2218 * those of server certificate, use certificate key for key exchange. 2219 * Otherwise, generate ephemeral key pair. 2220 */ 2221 EVP_PKEY_encrypt_init(pkey_ctx); 2222 2223 /* Generate session key. */ 2224 arc4random_buf(premaster_secret, 32); 2225 2226 /* 2227 * If we have client certificate, use its secret as peer key. 2228 */ 2229 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2230 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2231 s->cert->key->privatekey) <=0) { 2232 /* 2233 * If there was an error - just ignore it. 2234 * Ephemeral key would be used. 2235 */ 2236 ERR_clear_error(); 2237 } 2238 } 2239 2240 /* 2241 * Compute shared IV and store it in algorithm-specific context data. 2242 */ 2243 ukm_hash = EVP_MD_CTX_new(); 2244 if (ukm_hash == NULL) { 2245 SSLerror(s, ERR_R_MALLOC_FAILURE); 2246 goto err; 2247 } 2248 2249 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94) 2250 nid = NID_id_GostR3411_94; 2251 else 2252 nid = NID_id_tc26_gost3411_2012_256; 2253 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2254 goto err; 2255 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2256 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2257 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2258 EVP_MD_CTX_free(ukm_hash); 2259 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2260 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2261 SSLerror(s, SSL_R_LIBRARY_BUG); 2262 goto err; 2263 } 2264 2265 /* 2266 * Make GOST keytransport blob message, encapsulate it into sequence. 2267 */ 2268 msglen = 255; 2269 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2270 32) < 0) { 2271 SSLerror(s, SSL_R_LIBRARY_BUG); 2272 goto err; 2273 } 2274 2275 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2276 goto err; 2277 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2278 goto err; 2279 if (!CBB_flush(cbb)) 2280 goto err; 2281 2282 /* Check if pubkey from client certificate was used. */ 2283 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2284 NULL) > 0) { 2285 /* Set flag "skip certificate verify". */ 2286 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2287 } 2288 EVP_PKEY_CTX_free(pkey_ctx); 2289 s->session->master_key_length = 2290 tls1_generate_master_secret(s, 2291 s->session->master_key, premaster_secret, 32); 2292 2293 ret = 1; 2294 2295 err: 2296 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2297 EVP_PKEY_free(pub_key); 2298 2299 return (ret); 2300 } 2301 2302 int 2303 ssl3_send_client_key_exchange(SSL *s) 2304 { 2305 SESS_CERT *sess_cert; 2306 unsigned long alg_k; 2307 CBB cbb, kex; 2308 2309 memset(&cbb, 0, sizeof(cbb)); 2310 2311 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2312 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2313 2314 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2315 ssl3_send_alert(s, SSL3_AL_FATAL, 2316 SSL_AD_UNEXPECTED_MESSAGE); 2317 SSLerror(s, ERR_R_INTERNAL_ERROR); 2318 goto err; 2319 } 2320 2321 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2322 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2323 goto err; 2324 2325 if (alg_k & SSL_kRSA) { 2326 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2327 goto err; 2328 } else if (alg_k & SSL_kDHE) { 2329 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2330 goto err; 2331 } else if (alg_k & SSL_kECDHE) { 2332 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2333 goto err; 2334 } else if (alg_k & SSL_kGOST) { 2335 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2336 goto err; 2337 } else { 2338 ssl3_send_alert(s, SSL3_AL_FATAL, 2339 SSL_AD_HANDSHAKE_FAILURE); 2340 SSLerror(s, ERR_R_INTERNAL_ERROR); 2341 goto err; 2342 } 2343 2344 if (!ssl3_handshake_msg_finish(s, &cbb)) 2345 goto err; 2346 2347 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2348 } 2349 2350 /* SSL3_ST_CW_KEY_EXCH_B */ 2351 return (ssl3_handshake_write(s)); 2352 2353 err: 2354 CBB_cleanup(&cbb); 2355 2356 return (-1); 2357 } 2358 2359 static int 2360 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2361 { 2362 const struct ssl_sigalg *sigalg; 2363 CBB cbb_signature; 2364 EVP_PKEY_CTX *pctx = NULL; 2365 EVP_PKEY *pkey; 2366 EVP_MD_CTX mctx; 2367 const EVP_MD *md; 2368 const unsigned char *hdata; 2369 unsigned char *signature = NULL; 2370 size_t signature_len, hdata_len; 2371 int ret = 0; 2372 2373 EVP_MD_CTX_init(&mctx); 2374 2375 pkey = s->cert->key->privatekey; 2376 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2377 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2378 goto err; 2379 } 2380 if ((md = sigalg->md()) == NULL) { 2381 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2382 goto err; 2383 } 2384 2385 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2386 SSLerror(s, ERR_R_INTERNAL_ERROR); 2387 goto err; 2388 } 2389 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2390 SSLerror(s, ERR_R_EVP_LIB); 2391 goto err; 2392 } 2393 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2394 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2395 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2396 SSLerror(s, ERR_R_EVP_LIB); 2397 goto err; 2398 } 2399 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2400 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2401 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2402 SSLerror(s, ERR_R_EVP_LIB); 2403 goto err; 2404 } 2405 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2406 SSLerror(s, ERR_R_EVP_LIB); 2407 goto err; 2408 } 2409 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2410 signature_len == 0) { 2411 SSLerror(s, ERR_R_EVP_LIB); 2412 goto err; 2413 } 2414 if ((signature = calloc(1, signature_len)) == NULL) { 2415 SSLerror(s, ERR_R_MALLOC_FAILURE); 2416 goto err; 2417 } 2418 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2419 SSLerror(s, ERR_R_EVP_LIB); 2420 goto err; 2421 } 2422 2423 if (!CBB_add_u16(cert_verify, sigalg->value)) 2424 goto err; 2425 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2426 goto err; 2427 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2428 goto err; 2429 if (!CBB_flush(cert_verify)) 2430 goto err; 2431 2432 ret = 1; 2433 2434 err: 2435 EVP_MD_CTX_cleanup(&mctx); 2436 free(signature); 2437 return ret; 2438 } 2439 2440 static int 2441 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2442 { 2443 CBB cbb_signature; 2444 EVP_PKEY *pkey; 2445 unsigned char data[EVP_MAX_MD_SIZE]; 2446 unsigned char *signature = NULL; 2447 unsigned int signature_len; 2448 size_t data_len; 2449 int ret = 0; 2450 2451 pkey = s->cert->key->privatekey; 2452 2453 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2454 goto err; 2455 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2456 goto err; 2457 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2458 &signature_len, pkey->pkey.rsa) <= 0 ) { 2459 SSLerror(s, ERR_R_RSA_LIB); 2460 goto err; 2461 } 2462 2463 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2464 goto err; 2465 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2466 goto err; 2467 if (!CBB_flush(cert_verify)) 2468 goto err; 2469 2470 ret = 1; 2471 err: 2472 free(signature); 2473 return ret; 2474 } 2475 2476 static int 2477 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2478 { 2479 CBB cbb_signature; 2480 EVP_PKEY *pkey; 2481 unsigned char data[EVP_MAX_MD_SIZE]; 2482 unsigned char *signature = NULL; 2483 unsigned int signature_len; 2484 int ret = 0; 2485 2486 pkey = s->cert->key->privatekey; 2487 2488 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2489 goto err; 2490 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2491 goto err; 2492 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2493 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2494 SSLerror(s, ERR_R_ECDSA_LIB); 2495 goto err; 2496 } 2497 2498 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2499 goto err; 2500 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2501 goto err; 2502 if (!CBB_flush(cert_verify)) 2503 goto err; 2504 2505 ret = 1; 2506 err: 2507 free(signature); 2508 return ret; 2509 } 2510 2511 #ifndef OPENSSL_NO_GOST 2512 static int 2513 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2514 { 2515 CBB cbb_signature; 2516 EVP_MD_CTX mctx; 2517 EVP_PKEY_CTX *pctx; 2518 EVP_PKEY *pkey; 2519 const EVP_MD *md; 2520 const unsigned char *hdata; 2521 unsigned char *signature = NULL; 2522 size_t signature_len; 2523 size_t hdata_len; 2524 int nid; 2525 int ret = 0; 2526 2527 EVP_MD_CTX_init(&mctx); 2528 2529 pkey = s->cert->key->privatekey; 2530 2531 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2532 SSLerror(s, ERR_R_INTERNAL_ERROR); 2533 goto err; 2534 } 2535 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2536 (md = EVP_get_digestbynid(nid)) == NULL) { 2537 SSLerror(s, ERR_R_EVP_LIB); 2538 goto err; 2539 } 2540 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2541 SSLerror(s, ERR_R_EVP_LIB); 2542 goto err; 2543 } 2544 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2545 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2546 SSLerror(s, ERR_R_EVP_LIB); 2547 goto err; 2548 } 2549 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2550 SSLerror(s, ERR_R_EVP_LIB); 2551 goto err; 2552 } 2553 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2554 signature_len == 0) { 2555 SSLerror(s, ERR_R_EVP_LIB); 2556 goto err; 2557 } 2558 if ((signature = calloc(1, signature_len)) == NULL) { 2559 SSLerror(s, ERR_R_MALLOC_FAILURE); 2560 goto err; 2561 } 2562 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2563 SSLerror(s, ERR_R_EVP_LIB); 2564 goto err; 2565 } 2566 2567 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2568 goto err; 2569 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2570 goto err; 2571 if (!CBB_flush(cert_verify)) 2572 goto err; 2573 2574 ret = 1; 2575 err: 2576 EVP_MD_CTX_cleanup(&mctx); 2577 free(signature); 2578 return ret; 2579 } 2580 #endif 2581 2582 int 2583 ssl3_send_client_verify(SSL *s) 2584 { 2585 CBB cbb, cert_verify; 2586 EVP_PKEY *pkey; 2587 2588 memset(&cbb, 0, sizeof(cbb)); 2589 2590 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2591 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2592 SSL3_MT_CERTIFICATE_VERIFY)) 2593 goto err; 2594 2595 pkey = s->cert->key->privatekey; 2596 2597 /* 2598 * For TLS v1.2 send signature algorithm and signature 2599 * using agreed digest and cached handshake records. 2600 */ 2601 if (SSL_USE_SIGALGS(s)) { 2602 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2603 goto err; 2604 } else if (pkey->type == EVP_PKEY_RSA) { 2605 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2606 goto err; 2607 } else if (pkey->type == EVP_PKEY_EC) { 2608 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2609 goto err; 2610 #ifndef OPENSSL_NO_GOST 2611 } else if (pkey->type == NID_id_GostR3410_94 || 2612 pkey->type == NID_id_GostR3410_2001) { 2613 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2614 goto err; 2615 #endif 2616 } else { 2617 SSLerror(s, ERR_R_INTERNAL_ERROR); 2618 goto err; 2619 } 2620 2621 tls1_transcript_free(s); 2622 2623 if (!ssl3_handshake_msg_finish(s, &cbb)) 2624 goto err; 2625 2626 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2627 } 2628 2629 return (ssl3_handshake_write(s)); 2630 2631 err: 2632 CBB_cleanup(&cbb); 2633 2634 return (-1); 2635 } 2636 2637 int 2638 ssl3_send_client_certificate(SSL *s) 2639 { 2640 EVP_PKEY *pkey = NULL; 2641 X509 *x509 = NULL; 2642 CBB cbb, client_cert; 2643 int i; 2644 2645 memset(&cbb, 0, sizeof(cbb)); 2646 2647 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2648 if (s->cert->key->x509 == NULL || 2649 s->cert->key->privatekey == NULL) 2650 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2651 else 2652 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2653 } 2654 2655 /* We need to get a client cert */ 2656 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2657 /* 2658 * If we get an error, we need to 2659 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2660 * We then get retied later 2661 */ 2662 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2663 if (i < 0) { 2664 s->internal->rwstate = SSL_X509_LOOKUP; 2665 return (-1); 2666 } 2667 s->internal->rwstate = SSL_NOTHING; 2668 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2669 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2670 if (!SSL_use_certificate(s, x509) || 2671 !SSL_use_PrivateKey(s, pkey)) 2672 i = 0; 2673 } else if (i == 1) { 2674 i = 0; 2675 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2676 } 2677 2678 X509_free(x509); 2679 EVP_PKEY_free(pkey); 2680 if (i == 0) { 2681 S3I(s)->tmp.cert_req = 2; 2682 2683 /* There is no client certificate to verify. */ 2684 tls1_transcript_free(s); 2685 } 2686 2687 /* Ok, we have a cert */ 2688 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2689 } 2690 2691 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2692 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2693 SSL3_MT_CERTIFICATE)) 2694 goto err; 2695 if (!ssl3_output_cert_chain(s, &client_cert, 2696 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key)) 2697 goto err; 2698 if (!ssl3_handshake_msg_finish(s, &cbb)) 2699 goto err; 2700 2701 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2702 } 2703 2704 /* SSL3_ST_CW_CERT_D */ 2705 return (ssl3_handshake_write(s)); 2706 2707 err: 2708 CBB_cleanup(&cbb); 2709 2710 return (0); 2711 } 2712 2713 #define has_bits(i,m) (((i)&(m)) == (m)) 2714 2715 int 2716 ssl3_check_cert_and_algorithm(SSL *s) 2717 { 2718 int i, idx; 2719 long alg_k, alg_a; 2720 EVP_PKEY *pkey = NULL; 2721 SESS_CERT *sc; 2722 DH *dh; 2723 2724 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2725 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2726 2727 /* We don't have a certificate. */ 2728 if (alg_a & SSL_aNULL) 2729 return (1); 2730 2731 sc = SSI(s)->sess_cert; 2732 if (sc == NULL) { 2733 SSLerror(s, ERR_R_INTERNAL_ERROR); 2734 goto err; 2735 } 2736 dh = SSI(s)->sess_cert->peer_dh_tmp; 2737 2738 /* This is the passed certificate. */ 2739 2740 idx = sc->peer_cert_type; 2741 if (idx == SSL_PKEY_ECC) { 2742 if (ssl_check_srvr_ecc_cert_and_alg( 2743 sc->peer_pkeys[idx].x509, s) == 0) { 2744 /* check failed */ 2745 SSLerror(s, SSL_R_BAD_ECC_CERT); 2746 goto f_err; 2747 } else { 2748 return (1); 2749 } 2750 } 2751 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2752 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2753 EVP_PKEY_free(pkey); 2754 2755 /* Check that we have a certificate if we require one. */ 2756 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2757 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2758 goto f_err; 2759 } 2760 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2761 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2762 goto f_err; 2763 } 2764 if ((alg_k & SSL_kDHE) && 2765 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2766 SSLerror(s, SSL_R_MISSING_DH_KEY); 2767 goto f_err; 2768 } 2769 2770 return (1); 2771 f_err: 2772 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2773 err: 2774 return (0); 2775 } 2776 2777 /* 2778 * Check to see if handshake is full or resumed. Usually this is just a 2779 * case of checking to see if a cache hit has occurred. In the case of 2780 * session tickets we have to check the next message to be sure. 2781 */ 2782 2783 int 2784 ssl3_check_finished(SSL *s) 2785 { 2786 int ok; 2787 long n; 2788 2789 /* If we have no ticket it cannot be a resumed session. */ 2790 if (!s->session->tlsext_tick) 2791 return (1); 2792 /* this function is called when we really expect a Certificate 2793 * message, so permit appropriate message length */ 2794 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2795 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2796 if (!ok) 2797 return ((int)n); 2798 2799 S3I(s)->tmp.reuse_message = 1; 2800 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2801 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2802 return (2); 2803 2804 return (1); 2805 } 2806 2807 int 2808 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2809 { 2810 int i = 0; 2811 2812 #ifndef OPENSSL_NO_ENGINE 2813 if (s->ctx->internal->client_cert_engine) { 2814 i = ENGINE_load_ssl_client_cert( 2815 s->ctx->internal->client_cert_engine, s, 2816 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2817 if (i != 0) 2818 return (i); 2819 } 2820 #endif 2821 if (s->ctx->internal->client_cert_cb) 2822 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2823 return (i); 2824 } 2825