1 /* $OpenBSD: ssl_clnt.c,v 1.64 2020/03/06 16:36:47 tb 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 = dtls1_get_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 BUF_MEM_free(s->internal->init_buf); 593 s->internal->init_buf = NULL; 594 } 595 596 ssl_free_wbio_buffer(s); 597 598 s->internal->init_num = 0; 599 s->internal->renegotiate = 0; 600 s->internal->new_session = 0; 601 602 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT); 603 if (s->internal->hit) 604 s->ctx->internal->stats.sess_hit++; 605 606 ret = 1; 607 /* s->server=0; */ 608 s->internal->handshake_func = ssl3_connect; 609 s->ctx->internal->stats.sess_connect_good++; 610 611 if (cb != NULL) 612 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 613 614 if (SSL_IS_DTLS(s)) { 615 /* done with handshaking */ 616 D1I(s)->handshake_read_seq = 0; 617 D1I(s)->next_handshake_write_seq = 0; 618 } 619 620 goto end; 621 /* break; */ 622 623 default: 624 SSLerror(s, SSL_R_UNKNOWN_STATE); 625 ret = -1; 626 goto end; 627 /* break; */ 628 } 629 630 /* did we do anything */ 631 if (!S3I(s)->tmp.reuse_message && !skip) { 632 if (s->internal->debug) { 633 if ((ret = BIO_flush(s->wbio)) <= 0) 634 goto end; 635 } 636 637 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 638 new_state = S3I(s)->hs.state; 639 S3I(s)->hs.state = state; 640 cb(s, SSL_CB_CONNECT_LOOP, 1); 641 S3I(s)->hs.state = new_state; 642 } 643 } 644 skip = 0; 645 } 646 647 end: 648 s->internal->in_handshake--; 649 if (cb != NULL) 650 cb(s, SSL_CB_CONNECT_EXIT, ret); 651 652 return (ret); 653 } 654 655 int 656 ssl3_send_client_hello(SSL *s) 657 { 658 CBB cbb, client_hello, session_id, cookie, cipher_suites; 659 CBB compression_methods; 660 uint16_t max_version; 661 size_t sl; 662 663 memset(&cbb, 0, sizeof(cbb)); 664 665 if (S3I(s)->hs.state == SSL3_ST_CW_CLNT_HELLO_A) { 666 SSL_SESSION *sess = s->session; 667 668 if (ssl_supported_version_range(s, NULL, &max_version) != 1) { 669 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 670 return (-1); 671 } 672 s->client_version = s->version = max_version; 673 674 if (sess == NULL || 675 sess->ssl_version != s->version || 676 (!sess->session_id_length && !sess->tlsext_tick) || 677 sess->internal->not_resumable) { 678 if (!ssl_get_new_session(s, 0)) 679 goto err; 680 } 681 /* else use the pre-loaded session */ 682 683 /* 684 * If a DTLS ClientHello message is being resent after a 685 * HelloVerifyRequest, we must retain the original client 686 * random value. 687 */ 688 if (!SSL_IS_DTLS(s) || D1I(s)->send_cookie == 0) 689 arc4random_buf(s->s3->client_random, SSL3_RANDOM_SIZE); 690 691 if (!ssl3_handshake_msg_start(s, &cbb, &client_hello, 692 SSL3_MT_CLIENT_HELLO)) 693 goto err; 694 695 /* 696 * Version indicates the negotiated version: for example from 697 * an SSLv2/v3 compatible client hello). The client_version 698 * field is the maximum version we permit and it is also 699 * used in RSA encrypted premaster secrets. Some servers can 700 * choke if we initially report a higher version then 701 * renegotiate to a lower one in the premaster secret. This 702 * didn't happen with TLS 1.0 as most servers supported it 703 * but it can with TLS 1.1 or later if the server only supports 704 * 1.0. 705 * 706 * Possible scenario with previous logic: 707 * 1. Client hello indicates TLS 1.2 708 * 2. Server hello says TLS 1.0 709 * 3. RSA encrypted premaster secret uses 1.2. 710 * 4. Handhaked proceeds using TLS 1.0. 711 * 5. Server sends hello request to renegotiate. 712 * 6. Client hello indicates TLS v1.0 as we now 713 * know that is maximum server supports. 714 * 7. Server chokes on RSA encrypted premaster secret 715 * containing version 1.0. 716 * 717 * For interoperability it should be OK to always use the 718 * maximum version we support in client hello and then rely 719 * on the checking of version to ensure the servers isn't 720 * being inconsistent: for example initially negotiating with 721 * TLS 1.0 and renegotiating with TLS 1.2. We do this by using 722 * client_version in client hello and not resetting it to 723 * the negotiated version. 724 */ 725 if (!CBB_add_u16(&client_hello, s->client_version)) 726 goto err; 727 728 /* Random stuff */ 729 if (!CBB_add_bytes(&client_hello, s->s3->client_random, 730 sizeof(s->s3->client_random))) 731 goto err; 732 733 /* Session ID */ 734 if (!CBB_add_u8_length_prefixed(&client_hello, &session_id)) 735 goto err; 736 if (!s->internal->new_session && 737 s->session->session_id_length > 0) { 738 sl = s->session->session_id_length; 739 if (sl > sizeof(s->session->session_id)) { 740 SSLerror(s, ERR_R_INTERNAL_ERROR); 741 goto err; 742 } 743 if (!CBB_add_bytes(&session_id, 744 s->session->session_id, sl)) 745 goto err; 746 } 747 748 /* DTLS Cookie. */ 749 if (SSL_IS_DTLS(s)) { 750 if (D1I(s)->cookie_len > sizeof(D1I(s)->cookie)) { 751 SSLerror(s, ERR_R_INTERNAL_ERROR); 752 goto err; 753 } 754 if (!CBB_add_u8_length_prefixed(&client_hello, &cookie)) 755 goto err; 756 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, 757 D1I(s)->cookie_len)) 758 goto err; 759 } 760 761 /* Ciphers supported */ 762 if (!CBB_add_u16_length_prefixed(&client_hello, &cipher_suites)) 763 return 0; 764 if (!ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), 765 &cipher_suites)) { 766 SSLerror(s, SSL_R_NO_CIPHERS_AVAILABLE); 767 goto err; 768 } 769 770 /* Add in compression methods (null) */ 771 if (!CBB_add_u8_length_prefixed(&client_hello, 772 &compression_methods)) 773 goto err; 774 if (!CBB_add_u8(&compression_methods, 0)) 775 goto err; 776 777 /* TLS extensions */ 778 if (!tlsext_client_build(s, &client_hello, SSL_TLSEXT_MSG_CH)) { 779 SSLerror(s, ERR_R_INTERNAL_ERROR); 780 goto err; 781 } 782 783 if (!ssl3_handshake_msg_finish(s, &cbb)) 784 goto err; 785 786 S3I(s)->hs.state = SSL3_ST_CW_CLNT_HELLO_B; 787 } 788 789 /* SSL3_ST_CW_CLNT_HELLO_B */ 790 return (ssl3_handshake_write(s)); 791 792 err: 793 CBB_cleanup(&cbb); 794 795 return (-1); 796 } 797 798 int 799 ssl3_get_server_hello(SSL *s) 800 { 801 CBS cbs, server_random, session_id; 802 uint16_t server_version, cipher_suite; 803 uint16_t min_version, max_version; 804 uint8_t compression_method; 805 STACK_OF(SSL_CIPHER) *sk; 806 const SSL_CIPHER *cipher; 807 const SSL_METHOD *method; 808 unsigned long alg_k; 809 size_t outlen; 810 int i, al, ok; 811 long n; 812 813 s->internal->first_packet = 1; 814 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 815 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 816 if (!ok) 817 return ((int)n); 818 s->internal->first_packet = 0; 819 820 if (n < 0) 821 goto truncated; 822 823 CBS_init(&cbs, s->internal->init_msg, n); 824 825 if (SSL_IS_DTLS(s)) { 826 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 827 if (D1I(s)->send_cookie == 0) { 828 S3I(s)->tmp.reuse_message = 1; 829 return (1); 830 } else { 831 /* Already sent a cookie. */ 832 al = SSL_AD_UNEXPECTED_MESSAGE; 833 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 834 goto f_err; 835 } 836 } 837 } 838 839 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) { 840 al = SSL_AD_UNEXPECTED_MESSAGE; 841 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 842 goto f_err; 843 } 844 845 if (!CBS_get_u16(&cbs, &server_version)) 846 goto truncated; 847 848 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) { 849 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 850 goto err; 851 } 852 853 if (server_version < min_version || server_version > max_version) { 854 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 855 s->version = (s->version & 0xff00) | (server_version & 0xff); 856 al = SSL_AD_PROTOCOL_VERSION; 857 goto f_err; 858 } 859 s->version = server_version; 860 861 if ((method = tls1_get_client_method(server_version)) == NULL) 862 method = dtls1_get_client_method(server_version); 863 if (method == NULL) { 864 SSLerror(s, ERR_R_INTERNAL_ERROR); 865 goto err; 866 } 867 s->method = method; 868 869 /* Server random. */ 870 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 871 goto truncated; 872 if (!CBS_write_bytes(&server_random, s->s3->server_random, 873 sizeof(s->s3->server_random), NULL)) 874 goto err; 875 876 if (!SSL_IS_DTLS(s) && !ssl_enabled_version_range(s, NULL, &max_version)) 877 goto err; 878 if (!SSL_IS_DTLS(s) && max_version >= TLS1_2_VERSION && 879 s->version < max_version) { 880 /* 881 * RFC 8446 section 4.1.3. We must not downgrade if the server 882 * random value contains the TLS 1.2 or TLS 1.1 magical value. 883 */ 884 if (!CBS_skip(&server_random, 885 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 886 goto err; 887 if (s->version == TLS1_2_VERSION && 888 CBS_mem_equal(&server_random, tls13_downgrade_12, 889 sizeof(tls13_downgrade_12))) { 890 al = SSL_AD_ILLEGAL_PARAMETER; 891 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 892 goto f_err; 893 } 894 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 895 sizeof(tls13_downgrade_11))) { 896 al = SSL_AD_ILLEGAL_PARAMETER; 897 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 898 goto f_err; 899 } 900 } 901 902 /* Session ID. */ 903 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 904 goto truncated; 905 906 if ((CBS_len(&session_id) > sizeof(s->session->session_id)) || 907 (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE)) { 908 al = SSL_AD_ILLEGAL_PARAMETER; 909 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 910 goto f_err; 911 } 912 913 /* Cipher suite. */ 914 if (!CBS_get_u16(&cbs, &cipher_suite)) 915 goto truncated; 916 917 /* 918 * Check if we want to resume the session based on external 919 * pre-shared secret. 920 */ 921 if (s->internal->tls_session_secret_cb) { 922 SSL_CIPHER *pref_cipher = NULL; 923 s->session->master_key_length = sizeof(s->session->master_key); 924 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 925 &s->session->master_key_length, NULL, &pref_cipher, 926 s->internal->tls_session_secret_cb_arg)) { 927 s->session->cipher = pref_cipher ? pref_cipher : 928 ssl3_get_cipher_by_value(cipher_suite); 929 s->s3->flags |= SSL3_FLAGS_CCS_OK; 930 } 931 } 932 933 if (s->session->session_id_length != 0 && 934 CBS_mem_equal(&session_id, s->session->session_id, 935 s->session->session_id_length)) { 936 if (s->sid_ctx_length != s->session->sid_ctx_length || 937 timingsafe_memcmp(s->session->sid_ctx, 938 s->sid_ctx, s->sid_ctx_length) != 0) { 939 /* actually a client application bug */ 940 al = SSL_AD_ILLEGAL_PARAMETER; 941 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 942 goto f_err; 943 } 944 s->s3->flags |= SSL3_FLAGS_CCS_OK; 945 s->internal->hit = 1; 946 } else { 947 /* a miss or crap from the other end */ 948 949 /* If we were trying for session-id reuse, make a new 950 * SSL_SESSION so we don't stuff up other people */ 951 s->internal->hit = 0; 952 if (s->session->session_id_length > 0) { 953 if (!ssl_get_new_session(s, 0)) { 954 al = SSL_AD_INTERNAL_ERROR; 955 goto f_err; 956 } 957 } 958 959 /* 960 * XXX - improve the handling for the case where there is a 961 * zero length session identifier. 962 */ 963 if (!CBS_write_bytes(&session_id, s->session->session_id, 964 sizeof(s->session->session_id), &outlen)) 965 goto err; 966 s->session->session_id_length = outlen; 967 968 s->session->ssl_version = s->version; 969 } 970 971 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 972 al = SSL_AD_ILLEGAL_PARAMETER; 973 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 974 goto f_err; 975 } 976 977 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 978 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 979 (TLS1_get_version(s) < TLS1_2_VERSION)) { 980 al = SSL_AD_ILLEGAL_PARAMETER; 981 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 982 goto f_err; 983 } 984 985 sk = ssl_get_ciphers_by_id(s); 986 i = sk_SSL_CIPHER_find(sk, cipher); 987 if (i < 0) { 988 /* we did not say we would use this cipher */ 989 al = SSL_AD_ILLEGAL_PARAMETER; 990 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 991 goto f_err; 992 } 993 994 /* 995 * Depending on the session caching (internal/external), the cipher 996 * and/or cipher_id values may not be set. Make sure that 997 * cipher_id is set and use it for comparison. 998 */ 999 if (s->session->cipher) 1000 s->session->cipher_id = s->session->cipher->id; 1001 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1002 al = SSL_AD_ILLEGAL_PARAMETER; 1003 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1004 goto f_err; 1005 } 1006 S3I(s)->hs.new_cipher = cipher; 1007 1008 if (!tls1_transcript_hash_init(s)) 1009 goto err; 1010 1011 /* 1012 * Don't digest cached records if no sigalgs: we may need them for 1013 * client authentication. 1014 */ 1015 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1016 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1017 tls1_transcript_free(s); 1018 1019 if (!CBS_get_u8(&cbs, &compression_method)) 1020 goto truncated; 1021 1022 if (compression_method != 0) { 1023 al = SSL_AD_ILLEGAL_PARAMETER; 1024 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1025 goto f_err; 1026 } 1027 1028 if (!tlsext_client_parse(s, &cbs, &al, SSL_TLSEXT_MSG_SH)) { 1029 SSLerror(s, SSL_R_PARSE_TLSEXT); 1030 goto f_err; 1031 } 1032 1033 /* 1034 * Determine if we need to see RI. Strictly speaking if we want to 1035 * avoid an attack we should *always* see RI even on initial server 1036 * hello because the client doesn't see any renegotiation during an 1037 * attack. However this would mean we could not connect to any server 1038 * which doesn't support RI so for the immediate future tolerate RI 1039 * absence on initial connect only. 1040 */ 1041 if (!S3I(s)->renegotiate_seen && 1042 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1043 al = SSL_AD_HANDSHAKE_FAILURE; 1044 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1045 goto f_err; 1046 } 1047 1048 if (ssl_check_serverhello_tlsext(s) <= 0) { 1049 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1050 goto err; 1051 } 1052 1053 return (1); 1054 1055 truncated: 1056 /* wrong packet length */ 1057 al = SSL_AD_DECODE_ERROR; 1058 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1059 f_err: 1060 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1061 err: 1062 return (-1); 1063 } 1064 1065 int 1066 ssl3_get_server_certificate(SSL *s) 1067 { 1068 int al, i, ok, ret = -1; 1069 long n; 1070 CBS cbs, cert_list; 1071 X509 *x = NULL; 1072 const unsigned char *q; 1073 STACK_OF(X509) *sk = NULL; 1074 SESS_CERT *sc; 1075 EVP_PKEY *pkey = NULL; 1076 1077 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1078 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1079 if (!ok) 1080 return ((int)n); 1081 1082 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1083 S3I(s)->tmp.reuse_message = 1; 1084 return (1); 1085 } 1086 1087 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1088 al = SSL_AD_UNEXPECTED_MESSAGE; 1089 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1090 goto f_err; 1091 } 1092 1093 1094 if ((sk = sk_X509_new_null()) == NULL) { 1095 SSLerror(s, ERR_R_MALLOC_FAILURE); 1096 goto err; 1097 } 1098 1099 if (n < 0) 1100 goto truncated; 1101 1102 CBS_init(&cbs, s->internal->init_msg, n); 1103 if (CBS_len(&cbs) < 3) 1104 goto truncated; 1105 1106 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1107 CBS_len(&cbs) != 0) { 1108 al = SSL_AD_DECODE_ERROR; 1109 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1110 goto f_err; 1111 } 1112 1113 while (CBS_len(&cert_list) > 0) { 1114 CBS cert; 1115 1116 if (CBS_len(&cert_list) < 3) 1117 goto truncated; 1118 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1119 al = SSL_AD_DECODE_ERROR; 1120 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1121 goto f_err; 1122 } 1123 1124 q = CBS_data(&cert); 1125 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1126 if (x == NULL) { 1127 al = SSL_AD_BAD_CERTIFICATE; 1128 SSLerror(s, ERR_R_ASN1_LIB); 1129 goto f_err; 1130 } 1131 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1132 al = SSL_AD_DECODE_ERROR; 1133 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1134 goto f_err; 1135 } 1136 if (!sk_X509_push(sk, x)) { 1137 SSLerror(s, ERR_R_MALLOC_FAILURE); 1138 goto err; 1139 } 1140 x = NULL; 1141 } 1142 1143 i = ssl_verify_cert_chain(s, sk); 1144 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1145 al = ssl_verify_alarm_type(s->verify_result); 1146 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1147 goto f_err; 1148 1149 } 1150 ERR_clear_error(); /* but we keep s->verify_result */ 1151 1152 sc = ssl_sess_cert_new(); 1153 if (sc == NULL) 1154 goto err; 1155 ssl_sess_cert_free(SSI(s)->sess_cert); 1156 SSI(s)->sess_cert = sc; 1157 1158 sc->cert_chain = sk; 1159 /* 1160 * Inconsistency alert: cert_chain does include the peer's 1161 * certificate, which we don't include in s3_srvr.c 1162 */ 1163 x = sk_X509_value(sk, 0); 1164 sk = NULL; 1165 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1166 1167 pkey = X509_get_pubkey(x); 1168 1169 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1170 x = NULL; 1171 al = SSL3_AL_FATAL; 1172 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1173 goto f_err; 1174 } 1175 1176 i = ssl_cert_type(x, pkey); 1177 if (i < 0) { 1178 x = NULL; 1179 al = SSL3_AL_FATAL; 1180 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1181 goto f_err; 1182 } 1183 1184 sc->peer_cert_type = i; 1185 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1186 /* 1187 * Why would the following ever happen? 1188 * We just created sc a couple of lines ago. 1189 */ 1190 X509_free(sc->peer_pkeys[i].x509); 1191 sc->peer_pkeys[i].x509 = x; 1192 sc->peer_key = &(sc->peer_pkeys[i]); 1193 1194 X509_free(s->session->peer); 1195 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1196 s->session->peer = x; 1197 s->session->verify_result = s->verify_result; 1198 1199 x = NULL; 1200 ret = 1; 1201 1202 if (0) { 1203 truncated: 1204 /* wrong packet length */ 1205 al = SSL_AD_DECODE_ERROR; 1206 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1207 f_err: 1208 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1209 } 1210 err: 1211 EVP_PKEY_free(pkey); 1212 X509_free(x); 1213 sk_X509_pop_free(sk, X509_free); 1214 1215 return (ret); 1216 } 1217 1218 static int 1219 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1220 { 1221 CBS dhp, dhg, dhpk; 1222 BN_CTX *bn_ctx = NULL; 1223 SESS_CERT *sc = NULL; 1224 DH *dh = NULL; 1225 long alg_a; 1226 int al; 1227 1228 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1229 sc = SSI(s)->sess_cert; 1230 1231 if ((dh = DH_new()) == NULL) { 1232 SSLerror(s, ERR_R_DH_LIB); 1233 goto err; 1234 } 1235 1236 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1237 goto truncated; 1238 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1239 SSLerror(s, ERR_R_BN_LIB); 1240 goto err; 1241 } 1242 1243 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1244 goto truncated; 1245 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1246 SSLerror(s, ERR_R_BN_LIB); 1247 goto err; 1248 } 1249 1250 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1251 goto truncated; 1252 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1253 NULL)) == NULL) { 1254 SSLerror(s, ERR_R_BN_LIB); 1255 goto err; 1256 } 1257 1258 /* 1259 * Check the strength of the DH key just constructed. 1260 * Discard keys weaker than 1024 bits. 1261 */ 1262 if (DH_size(dh) < 1024 / 8) { 1263 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1264 goto err; 1265 } 1266 1267 if (alg_a & SSL_aRSA) 1268 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1269 else 1270 /* XXX - Anonymous DH, so no certificate or pkey. */ 1271 *pkey = NULL; 1272 1273 sc->peer_dh_tmp = dh; 1274 1275 return (1); 1276 1277 truncated: 1278 al = SSL_AD_DECODE_ERROR; 1279 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1280 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1281 1282 err: 1283 DH_free(dh); 1284 BN_CTX_free(bn_ctx); 1285 1286 return (-1); 1287 } 1288 1289 static int 1290 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1291 { 1292 EC_KEY *ecdh = NULL; 1293 int ret = -1; 1294 1295 /* Extract the server's ephemeral ECDH public key. */ 1296 if ((ecdh = EC_KEY_new()) == NULL) { 1297 SSLerror(s, ERR_R_MALLOC_FAILURE); 1298 goto err; 1299 } 1300 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1301 SSLerror(s, SSL_R_BAD_ECPOINT); 1302 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1303 goto err; 1304 } 1305 1306 sc->peer_nid = nid; 1307 sc->peer_ecdh_tmp = ecdh; 1308 ecdh = NULL; 1309 1310 ret = 1; 1311 1312 err: 1313 EC_KEY_free(ecdh); 1314 1315 return (ret); 1316 } 1317 1318 static int 1319 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1320 { 1321 size_t outlen; 1322 1323 if (nid != NID_X25519) { 1324 SSLerror(s, ERR_R_INTERNAL_ERROR); 1325 goto err; 1326 } 1327 1328 if (CBS_len(public) != X25519_KEY_LENGTH) { 1329 SSLerror(s, SSL_R_BAD_ECPOINT); 1330 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1331 goto err; 1332 } 1333 1334 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1335 SSLerror(s, ERR_R_MALLOC_FAILURE); 1336 goto err; 1337 } 1338 1339 return (1); 1340 1341 err: 1342 return (-1); 1343 } 1344 1345 static int 1346 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1347 { 1348 CBS public; 1349 uint8_t curve_type; 1350 uint16_t curve_id; 1351 SESS_CERT *sc; 1352 long alg_a; 1353 int nid; 1354 int al; 1355 1356 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1357 sc = SSI(s)->sess_cert; 1358 1359 /* Only named curves are supported. */ 1360 if (!CBS_get_u8(cbs, &curve_type) || 1361 curve_type != NAMED_CURVE_TYPE || 1362 !CBS_get_u16(cbs, &curve_id)) { 1363 al = SSL_AD_DECODE_ERROR; 1364 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1365 goto f_err; 1366 } 1367 1368 /* 1369 * Check that the curve is one of our preferences - if it is not, 1370 * the server has sent us an invalid curve. 1371 */ 1372 if (tls1_check_curve(s, curve_id) != 1) { 1373 al = SSL_AD_DECODE_ERROR; 1374 SSLerror(s, SSL_R_WRONG_CURVE); 1375 goto f_err; 1376 } 1377 1378 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1379 al = SSL_AD_INTERNAL_ERROR; 1380 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1381 goto f_err; 1382 } 1383 1384 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1385 goto truncated; 1386 1387 if (nid == NID_X25519) { 1388 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1389 goto err; 1390 } else { 1391 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1392 goto err; 1393 } 1394 1395 /* 1396 * The ECC/TLS specification does not mention the use of DSA to sign 1397 * ECParameters in the server key exchange message. We do support RSA 1398 * and ECDSA. 1399 */ 1400 if (alg_a & SSL_aRSA) 1401 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1402 else if (alg_a & SSL_aECDSA) 1403 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1404 else 1405 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1406 *pkey = NULL; 1407 1408 return (1); 1409 1410 truncated: 1411 al = SSL_AD_DECODE_ERROR; 1412 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1413 1414 f_err: 1415 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1416 1417 err: 1418 return (-1); 1419 } 1420 1421 int 1422 ssl3_get_server_key_exchange(SSL *s) 1423 { 1424 CBS cbs, signature; 1425 const EVP_MD *md = NULL; 1426 EVP_PKEY *pkey = NULL; 1427 EVP_MD_CTX md_ctx; 1428 const unsigned char *param; 1429 long n, alg_k, alg_a; 1430 int al, ok; 1431 size_t param_len; 1432 1433 EVP_MD_CTX_init(&md_ctx); 1434 1435 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1436 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1437 1438 /* 1439 * Use same message size as in ssl3_get_certificate_request() 1440 * as ServerKeyExchange message may be skipped. 1441 */ 1442 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1443 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1444 if (!ok) 1445 return ((int)n); 1446 1447 if (n < 0) 1448 goto err; 1449 1450 CBS_init(&cbs, s->internal->init_msg, n); 1451 1452 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1453 /* 1454 * Do not skip server key exchange if this cipher suite uses 1455 * ephemeral keys. 1456 */ 1457 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1458 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1459 al = SSL_AD_UNEXPECTED_MESSAGE; 1460 goto f_err; 1461 } 1462 1463 S3I(s)->tmp.reuse_message = 1; 1464 EVP_MD_CTX_cleanup(&md_ctx); 1465 return (1); 1466 } 1467 1468 if (SSI(s)->sess_cert != NULL) { 1469 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1470 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1471 1472 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1473 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1474 1475 free(SSI(s)->sess_cert->peer_x25519_tmp); 1476 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1477 } else { 1478 SSI(s)->sess_cert = ssl_sess_cert_new(); 1479 if (SSI(s)->sess_cert == NULL) 1480 goto err; 1481 } 1482 1483 param = CBS_data(&cbs); 1484 param_len = CBS_len(&cbs); 1485 1486 if (alg_k & SSL_kDHE) { 1487 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1488 goto err; 1489 } else if (alg_k & SSL_kECDHE) { 1490 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1491 goto err; 1492 } else if (alg_k != 0) { 1493 al = SSL_AD_UNEXPECTED_MESSAGE; 1494 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1495 goto f_err; 1496 } 1497 1498 param_len -= CBS_len(&cbs); 1499 1500 /* if it was signed, check the signature */ 1501 if (pkey != NULL) { 1502 EVP_PKEY_CTX *pctx; 1503 const struct ssl_sigalg *sigalg; 1504 1505 if (SSL_USE_SIGALGS(s)) { 1506 uint16_t sigalg_value; 1507 1508 if (!CBS_get_u16(&cbs, &sigalg_value)) 1509 goto truncated; 1510 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1511 tls12_sigalgs_len)) == NULL) { 1512 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1513 al = SSL_AD_DECODE_ERROR; 1514 goto f_err; 1515 } 1516 if ((md = sigalg->md()) == NULL) { 1517 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1518 al = SSL_AD_DECODE_ERROR; 1519 goto f_err; 1520 } 1521 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 1522 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1523 al = SSL_AD_DECODE_ERROR; 1524 goto f_err; 1525 } 1526 } else if (pkey->type == EVP_PKEY_RSA) { 1527 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1528 } else if (pkey->type == EVP_PKEY_EC) { 1529 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1530 } else { 1531 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1532 al = SSL_AD_DECODE_ERROR; 1533 goto f_err; 1534 } 1535 md = sigalg->md(); 1536 1537 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1538 goto truncated; 1539 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1540 al = SSL_AD_DECODE_ERROR; 1541 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1542 goto f_err; 1543 } 1544 1545 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1546 goto err; 1547 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1548 SSL3_RANDOM_SIZE)) 1549 goto err; 1550 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1551 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1552 RSA_PKCS1_PSS_PADDING) || 1553 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1554 goto err; 1555 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1556 SSL3_RANDOM_SIZE)) 1557 goto err; 1558 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1559 goto err; 1560 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1561 CBS_len(&signature)) <= 0) { 1562 al = SSL_AD_DECRYPT_ERROR; 1563 SSLerror(s, SSL_R_BAD_SIGNATURE); 1564 goto f_err; 1565 } 1566 } else { 1567 /* aNULL does not need public keys. */ 1568 if (!(alg_a & SSL_aNULL)) { 1569 SSLerror(s, ERR_R_INTERNAL_ERROR); 1570 goto err; 1571 } 1572 } 1573 1574 if (CBS_len(&cbs) != 0) { 1575 al = SSL_AD_DECODE_ERROR; 1576 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1577 goto f_err; 1578 } 1579 1580 EVP_PKEY_free(pkey); 1581 EVP_MD_CTX_cleanup(&md_ctx); 1582 1583 return (1); 1584 1585 truncated: 1586 al = SSL_AD_DECODE_ERROR; 1587 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1588 1589 f_err: 1590 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1591 1592 err: 1593 EVP_PKEY_free(pkey); 1594 EVP_MD_CTX_cleanup(&md_ctx); 1595 1596 return (-1); 1597 } 1598 1599 int 1600 ssl3_get_certificate_request(SSL *s) 1601 { 1602 int ok, ret = 0; 1603 long n; 1604 uint8_t ctype_num; 1605 CBS cert_request, ctypes, rdn_list; 1606 X509_NAME *xn = NULL; 1607 const unsigned char *q; 1608 STACK_OF(X509_NAME) *ca_sk = NULL; 1609 1610 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1611 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1612 if (!ok) 1613 return ((int)n); 1614 1615 S3I(s)->tmp.cert_req = 0; 1616 1617 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1618 S3I(s)->tmp.reuse_message = 1; 1619 /* 1620 * If we get here we don't need any cached handshake records 1621 * as we wont be doing client auth. 1622 */ 1623 tls1_transcript_free(s); 1624 return (1); 1625 } 1626 1627 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1628 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1629 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1630 goto err; 1631 } 1632 1633 /* TLS does not like anon-DH with client cert */ 1634 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1635 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1636 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1637 goto err; 1638 } 1639 1640 if (n < 0) 1641 goto truncated; 1642 CBS_init(&cert_request, s->internal->init_msg, n); 1643 1644 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1645 SSLerror(s, ERR_R_MALLOC_FAILURE); 1646 goto err; 1647 } 1648 1649 /* get the certificate types */ 1650 if (!CBS_get_u8(&cert_request, &ctype_num)) 1651 goto truncated; 1652 1653 if (ctype_num > SSL3_CT_NUMBER) 1654 ctype_num = SSL3_CT_NUMBER; 1655 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1656 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1657 sizeof(S3I(s)->tmp.ctype), NULL)) { 1658 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1659 goto err; 1660 } 1661 1662 if (SSL_USE_SIGALGS(s)) { 1663 CBS sigalgs; 1664 1665 if (CBS_len(&cert_request) < 2) { 1666 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1667 goto err; 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 (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 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 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1680 &S3I(s)->hs.sigalgs_len)) 1681 goto err; 1682 } 1683 1684 /* get the CA RDNs */ 1685 if (CBS_len(&cert_request) < 2) { 1686 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1687 goto err; 1688 } 1689 1690 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1691 CBS_len(&cert_request) != 0) { 1692 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1693 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1694 goto err; 1695 } 1696 1697 while (CBS_len(&rdn_list) > 0) { 1698 CBS rdn; 1699 1700 if (CBS_len(&rdn_list) < 2) { 1701 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1702 goto err; 1703 } 1704 1705 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1706 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1707 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1708 goto err; 1709 } 1710 1711 q = CBS_data(&rdn); 1712 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1713 ssl3_send_alert(s, SSL3_AL_FATAL, 1714 SSL_AD_DECODE_ERROR); 1715 SSLerror(s, ERR_R_ASN1_LIB); 1716 goto err; 1717 } 1718 1719 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1720 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1721 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1722 goto err; 1723 } 1724 if (!sk_X509_NAME_push(ca_sk, xn)) { 1725 SSLerror(s, ERR_R_MALLOC_FAILURE); 1726 goto err; 1727 } 1728 xn = NULL; /* avoid free in err block */ 1729 } 1730 1731 /* we should setup a certificate to return.... */ 1732 S3I(s)->tmp.cert_req = 1; 1733 S3I(s)->tmp.ctype_num = ctype_num; 1734 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1735 S3I(s)->tmp.ca_names = ca_sk; 1736 ca_sk = NULL; 1737 1738 ret = 1; 1739 if (0) { 1740 truncated: 1741 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1742 } 1743 err: 1744 X509_NAME_free(xn); 1745 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1746 return (ret); 1747 } 1748 1749 static int 1750 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1751 { 1752 return (X509_NAME_cmp(*a, *b)); 1753 } 1754 1755 int 1756 ssl3_get_new_session_ticket(SSL *s) 1757 { 1758 int ok, al, ret = 0; 1759 uint32_t lifetime_hint; 1760 long n; 1761 CBS cbs, session_ticket; 1762 1763 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1764 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1765 if (!ok) 1766 return ((int)n); 1767 1768 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1769 S3I(s)->tmp.reuse_message = 1; 1770 return (1); 1771 } 1772 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1773 al = SSL_AD_UNEXPECTED_MESSAGE; 1774 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1775 goto f_err; 1776 } 1777 1778 if (n < 0) { 1779 al = SSL_AD_DECODE_ERROR; 1780 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1781 goto f_err; 1782 } 1783 1784 CBS_init(&cbs, s->internal->init_msg, n); 1785 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1786 #if UINT32_MAX > LONG_MAX 1787 lifetime_hint > LONG_MAX || 1788 #endif 1789 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1790 CBS_len(&cbs) != 0) { 1791 al = SSL_AD_DECODE_ERROR; 1792 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1793 goto f_err; 1794 } 1795 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1796 1797 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1798 &s->session->tlsext_ticklen)) { 1799 SSLerror(s, ERR_R_MALLOC_FAILURE); 1800 goto err; 1801 } 1802 1803 /* 1804 * There are two ways to detect a resumed ticket sesion. 1805 * One is to set an appropriate session ID and then the server 1806 * must return a match in ServerHello. This allows the normal 1807 * client session ID matching to work and we know much 1808 * earlier that the ticket has been accepted. 1809 * 1810 * The other way is to set zero length session ID when the 1811 * ticket is presented and rely on the handshake to determine 1812 * session resumption. 1813 * 1814 * We choose the former approach because this fits in with 1815 * assumptions elsewhere in OpenSSL. The session ID is set 1816 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1817 * ticket. 1818 */ 1819 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1820 s->session->session_id, &s->session->session_id_length, 1821 EVP_sha256(), NULL); 1822 ret = 1; 1823 return (ret); 1824 f_err: 1825 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1826 err: 1827 return (-1); 1828 } 1829 1830 int 1831 ssl3_get_cert_status(SSL *s) 1832 { 1833 CBS cert_status, response; 1834 size_t stow_len; 1835 int ok, al; 1836 long n; 1837 uint8_t status_type; 1838 1839 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1840 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1841 16384, &ok); 1842 if (!ok) 1843 return ((int)n); 1844 1845 if (n < 0) { 1846 /* need at least status type + length */ 1847 al = SSL_AD_DECODE_ERROR; 1848 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1849 goto f_err; 1850 } 1851 1852 CBS_init(&cert_status, s->internal->init_msg, n); 1853 if (!CBS_get_u8(&cert_status, &status_type) || 1854 CBS_len(&cert_status) < 3) { 1855 /* need at least status type + length */ 1856 al = SSL_AD_DECODE_ERROR; 1857 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1858 goto f_err; 1859 } 1860 1861 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1862 al = SSL_AD_DECODE_ERROR; 1863 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1864 goto f_err; 1865 } 1866 1867 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1868 CBS_len(&cert_status) != 0) { 1869 al = SSL_AD_DECODE_ERROR; 1870 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1871 goto f_err; 1872 } 1873 1874 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1875 &stow_len) || stow_len > INT_MAX) { 1876 s->internal->tlsext_ocsp_resplen = 0; 1877 al = SSL_AD_INTERNAL_ERROR; 1878 SSLerror(s, ERR_R_MALLOC_FAILURE); 1879 goto f_err; 1880 } 1881 s->internal->tlsext_ocsp_resplen = (int)stow_len; 1882 1883 if (s->ctx->internal->tlsext_status_cb) { 1884 int ret; 1885 ret = s->ctx->internal->tlsext_status_cb(s, 1886 s->ctx->internal->tlsext_status_arg); 1887 if (ret == 0) { 1888 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1889 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1890 goto f_err; 1891 } 1892 if (ret < 0) { 1893 al = SSL_AD_INTERNAL_ERROR; 1894 SSLerror(s, ERR_R_MALLOC_FAILURE); 1895 goto f_err; 1896 } 1897 } 1898 return (1); 1899 f_err: 1900 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1901 return (-1); 1902 } 1903 1904 int 1905 ssl3_get_server_done(SSL *s) 1906 { 1907 int ok, ret = 0; 1908 long n; 1909 1910 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1911 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1912 30, /* should be very small, like 0 :-) */ &ok); 1913 if (!ok) 1914 return ((int)n); 1915 1916 if (n > 0) { 1917 /* should contain no data */ 1918 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1919 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1920 return (-1); 1921 } 1922 ret = 1; 1923 return (ret); 1924 } 1925 1926 static int 1927 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1928 { 1929 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1930 unsigned char *enc_pms = NULL; 1931 EVP_PKEY *pkey = NULL; 1932 int ret = -1; 1933 int enc_len; 1934 CBB epms; 1935 1936 /* 1937 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1938 */ 1939 1940 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509); 1941 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1942 pkey->pkey.rsa == NULL) { 1943 SSLerror(s, ERR_R_INTERNAL_ERROR); 1944 goto err; 1945 } 1946 1947 pms[0] = s->client_version >> 8; 1948 pms[1] = s->client_version & 0xff; 1949 arc4random_buf(&pms[2], sizeof(pms) - 2); 1950 1951 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1952 SSLerror(s, ERR_R_MALLOC_FAILURE); 1953 goto err; 1954 } 1955 1956 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1957 RSA_PKCS1_PADDING); 1958 if (enc_len <= 0) { 1959 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1960 goto err; 1961 } 1962 1963 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1964 goto err; 1965 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1966 goto err; 1967 if (!CBB_flush(cbb)) 1968 goto err; 1969 1970 s->session->master_key_length = 1971 tls1_generate_master_secret(s, 1972 s->session->master_key, pms, sizeof(pms)); 1973 1974 ret = 1; 1975 1976 err: 1977 explicit_bzero(pms, sizeof(pms)); 1978 EVP_PKEY_free(pkey); 1979 free(enc_pms); 1980 1981 return (ret); 1982 } 1983 1984 static int 1985 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1986 { 1987 DH *dh_srvr = NULL, *dh_clnt = NULL; 1988 unsigned char *key = NULL; 1989 int key_size = 0, key_len; 1990 unsigned char *data; 1991 int ret = -1; 1992 CBB dh_Yc; 1993 1994 /* Ensure that we have an ephemeral key for DHE. */ 1995 if (sess_cert->peer_dh_tmp == NULL) { 1996 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1997 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1998 goto err; 1999 } 2000 dh_srvr = sess_cert->peer_dh_tmp; 2001 2002 /* Generate a new random key. */ 2003 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2004 SSLerror(s, ERR_R_DH_LIB); 2005 goto err; 2006 } 2007 if (!DH_generate_key(dh_clnt)) { 2008 SSLerror(s, ERR_R_DH_LIB); 2009 goto err; 2010 } 2011 if ((key_size = DH_size(dh_clnt)) <= 0) { 2012 SSLerror(s, ERR_R_DH_LIB); 2013 goto err; 2014 } 2015 if ((key = malloc(key_size)) == NULL) { 2016 SSLerror(s, ERR_R_MALLOC_FAILURE); 2017 goto err; 2018 } 2019 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2020 SSLerror(s, ERR_R_DH_LIB); 2021 goto err; 2022 } 2023 2024 /* Generate master key from the result. */ 2025 s->session->master_key_length = 2026 tls1_generate_master_secret(s, 2027 s->session->master_key, key, key_len); 2028 2029 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2030 goto err; 2031 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2032 goto err; 2033 BN_bn2bin(dh_clnt->pub_key, data); 2034 if (!CBB_flush(cbb)) 2035 goto err; 2036 2037 ret = 1; 2038 2039 err: 2040 DH_free(dh_clnt); 2041 freezero(key, key_size); 2042 2043 return (ret); 2044 } 2045 2046 static int 2047 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2048 { 2049 EC_KEY *ecdh = NULL; 2050 uint8_t *key = NULL; 2051 size_t key_len = 0; 2052 int ret = -1; 2053 CBB ecpoint; 2054 2055 if ((ecdh = EC_KEY_new()) == NULL) { 2056 SSLerror(s, ERR_R_MALLOC_FAILURE); 2057 goto err; 2058 } 2059 2060 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2061 goto err; 2062 2063 /* Encode our public key. */ 2064 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2065 goto err; 2066 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2067 goto err; 2068 if (!CBB_flush(cbb)) 2069 goto err; 2070 2071 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2072 goto err; 2073 s->session->master_key_length = tls1_generate_master_secret(s, 2074 s->session->master_key, key, key_len); 2075 2076 ret = 1; 2077 2078 err: 2079 freezero(key, key_len); 2080 EC_KEY_free(ecdh); 2081 2082 return (ret); 2083 } 2084 2085 static int 2086 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2087 { 2088 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2089 int ret = -1; 2090 CBB ecpoint; 2091 2092 /* Generate X25519 key pair and derive shared key. */ 2093 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2094 goto err; 2095 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2096 goto err; 2097 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2098 goto err; 2099 X25519_keypair(public_key, private_key); 2100 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2101 goto err; 2102 2103 /* Serialize the public key. */ 2104 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2105 goto err; 2106 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2107 goto err; 2108 if (!CBB_flush(cbb)) 2109 goto err; 2110 2111 /* Generate master key from the result. */ 2112 s->session->master_key_length = 2113 tls1_generate_master_secret(s, 2114 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2115 2116 ret = 1; 2117 2118 err: 2119 free(public_key); 2120 freezero(private_key, X25519_KEY_LENGTH); 2121 freezero(shared_key, X25519_KEY_LENGTH); 2122 2123 return (ret); 2124 } 2125 2126 static int 2127 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2128 { 2129 if (sc->peer_x25519_tmp != NULL) { 2130 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2131 goto err; 2132 } else if (sc->peer_ecdh_tmp != NULL) { 2133 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2134 goto err; 2135 } else { 2136 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2137 SSLerror(s, ERR_R_INTERNAL_ERROR); 2138 goto err; 2139 } 2140 2141 return (1); 2142 2143 err: 2144 return (-1); 2145 } 2146 2147 static int 2148 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2149 { 2150 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2151 EVP_PKEY *pub_key = NULL; 2152 EVP_PKEY_CTX *pkey_ctx; 2153 X509 *peer_cert; 2154 size_t msglen; 2155 unsigned int md_len; 2156 EVP_MD_CTX *ukm_hash; 2157 int ret = -1; 2158 int nid; 2159 CBB gostblob; 2160 2161 /* Get server sertificate PKEY and create ctx from it */ 2162 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2163 if (peer_cert == NULL) { 2164 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2165 goto err; 2166 } 2167 2168 pub_key = X509_get_pubkey(peer_cert); 2169 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2170 2171 /* 2172 * If we have send a certificate, and certificate key parameters match 2173 * those of server certificate, use certificate key for key exchange. 2174 * Otherwise, generate ephemeral key pair. 2175 */ 2176 EVP_PKEY_encrypt_init(pkey_ctx); 2177 2178 /* Generate session key. */ 2179 arc4random_buf(premaster_secret, 32); 2180 2181 /* 2182 * If we have client certificate, use its secret as peer key. 2183 */ 2184 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2185 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2186 s->cert->key->privatekey) <=0) { 2187 /* 2188 * If there was an error - just ignore it. 2189 * Ephemeral key would be used. 2190 */ 2191 ERR_clear_error(); 2192 } 2193 } 2194 2195 /* 2196 * Compute shared IV and store it in algorithm-specific context data. 2197 */ 2198 ukm_hash = EVP_MD_CTX_new(); 2199 if (ukm_hash == NULL) { 2200 SSLerror(s, ERR_R_MALLOC_FAILURE); 2201 goto err; 2202 } 2203 2204 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94) 2205 nid = NID_id_GostR3411_94; 2206 else 2207 nid = NID_id_tc26_gost3411_2012_256; 2208 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2209 goto err; 2210 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2211 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2212 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2213 EVP_MD_CTX_free(ukm_hash); 2214 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2215 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2216 SSLerror(s, SSL_R_LIBRARY_BUG); 2217 goto err; 2218 } 2219 2220 /* 2221 * Make GOST keytransport blob message, encapsulate it into sequence. 2222 */ 2223 msglen = 255; 2224 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2225 32) < 0) { 2226 SSLerror(s, SSL_R_LIBRARY_BUG); 2227 goto err; 2228 } 2229 2230 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2231 goto err; 2232 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2233 goto err; 2234 if (!CBB_flush(cbb)) 2235 goto err; 2236 2237 /* Check if pubkey from client certificate was used. */ 2238 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2239 NULL) > 0) { 2240 /* Set flag "skip certificate verify". */ 2241 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2242 } 2243 EVP_PKEY_CTX_free(pkey_ctx); 2244 s->session->master_key_length = 2245 tls1_generate_master_secret(s, 2246 s->session->master_key, premaster_secret, 32); 2247 2248 ret = 1; 2249 2250 err: 2251 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2252 EVP_PKEY_free(pub_key); 2253 2254 return (ret); 2255 } 2256 2257 int 2258 ssl3_send_client_key_exchange(SSL *s) 2259 { 2260 SESS_CERT *sess_cert; 2261 unsigned long alg_k; 2262 CBB cbb, kex; 2263 2264 memset(&cbb, 0, sizeof(cbb)); 2265 2266 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2267 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2268 2269 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2270 ssl3_send_alert(s, SSL3_AL_FATAL, 2271 SSL_AD_UNEXPECTED_MESSAGE); 2272 SSLerror(s, ERR_R_INTERNAL_ERROR); 2273 goto err; 2274 } 2275 2276 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2277 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2278 goto err; 2279 2280 if (alg_k & SSL_kRSA) { 2281 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2282 goto err; 2283 } else if (alg_k & SSL_kDHE) { 2284 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2285 goto err; 2286 } else if (alg_k & SSL_kECDHE) { 2287 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2288 goto err; 2289 } else if (alg_k & SSL_kGOST) { 2290 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2291 goto err; 2292 } else { 2293 ssl3_send_alert(s, SSL3_AL_FATAL, 2294 SSL_AD_HANDSHAKE_FAILURE); 2295 SSLerror(s, ERR_R_INTERNAL_ERROR); 2296 goto err; 2297 } 2298 2299 if (!ssl3_handshake_msg_finish(s, &cbb)) 2300 goto err; 2301 2302 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2303 } 2304 2305 /* SSL3_ST_CW_KEY_EXCH_B */ 2306 return (ssl3_handshake_write(s)); 2307 2308 err: 2309 CBB_cleanup(&cbb); 2310 2311 return (-1); 2312 } 2313 2314 static int 2315 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2316 { 2317 const struct ssl_sigalg *sigalg; 2318 CBB cbb_signature; 2319 EVP_PKEY_CTX *pctx = NULL; 2320 EVP_PKEY *pkey; 2321 EVP_MD_CTX mctx; 2322 const EVP_MD *md; 2323 const unsigned char *hdata; 2324 unsigned char *signature = NULL; 2325 size_t signature_len, hdata_len; 2326 int ret = 0; 2327 2328 EVP_MD_CTX_init(&mctx); 2329 2330 pkey = s->cert->key->privatekey; 2331 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2332 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2333 goto err; 2334 } 2335 if ((md = sigalg->md()) == NULL) { 2336 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2337 goto err; 2338 } 2339 2340 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2341 SSLerror(s, ERR_R_INTERNAL_ERROR); 2342 goto err; 2343 } 2344 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2345 SSLerror(s, ERR_R_EVP_LIB); 2346 goto err; 2347 } 2348 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2349 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2350 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2351 SSLerror(s, ERR_R_EVP_LIB); 2352 goto err; 2353 } 2354 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2355 SSLerror(s, ERR_R_EVP_LIB); 2356 goto err; 2357 } 2358 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2359 signature_len == 0) { 2360 SSLerror(s, ERR_R_EVP_LIB); 2361 goto err; 2362 } 2363 if ((signature = calloc(1, signature_len)) == NULL) { 2364 SSLerror(s, ERR_R_MALLOC_FAILURE); 2365 goto err; 2366 } 2367 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2368 SSLerror(s, ERR_R_EVP_LIB); 2369 goto err; 2370 } 2371 2372 if (!CBB_add_u16(cert_verify, sigalg->value)) 2373 goto err; 2374 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2375 goto err; 2376 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2377 goto err; 2378 if (!CBB_flush(cert_verify)) 2379 goto err; 2380 2381 ret = 1; 2382 2383 err: 2384 EVP_MD_CTX_cleanup(&mctx); 2385 free(signature); 2386 return ret; 2387 } 2388 2389 static int 2390 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2391 { 2392 CBB cbb_signature; 2393 EVP_PKEY *pkey; 2394 unsigned char data[EVP_MAX_MD_SIZE]; 2395 unsigned char *signature = NULL; 2396 unsigned int signature_len; 2397 size_t data_len; 2398 int ret = 0; 2399 2400 pkey = s->cert->key->privatekey; 2401 2402 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2403 goto err; 2404 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2405 goto err; 2406 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2407 &signature_len, pkey->pkey.rsa) <= 0 ) { 2408 SSLerror(s, ERR_R_RSA_LIB); 2409 goto err; 2410 } 2411 2412 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2413 goto err; 2414 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2415 goto err; 2416 if (!CBB_flush(cert_verify)) 2417 goto err; 2418 2419 ret = 1; 2420 err: 2421 free(signature); 2422 return ret; 2423 } 2424 2425 static int 2426 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2427 { 2428 CBB cbb_signature; 2429 EVP_PKEY *pkey; 2430 unsigned char data[EVP_MAX_MD_SIZE]; 2431 unsigned char *signature = NULL; 2432 unsigned int signature_len; 2433 int ret = 0; 2434 2435 pkey = s->cert->key->privatekey; 2436 2437 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2438 goto err; 2439 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2440 goto err; 2441 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2442 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2443 SSLerror(s, ERR_R_ECDSA_LIB); 2444 goto err; 2445 } 2446 2447 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2448 goto err; 2449 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2450 goto err; 2451 if (!CBB_flush(cert_verify)) 2452 goto err; 2453 2454 ret = 1; 2455 err: 2456 free(signature); 2457 return ret; 2458 } 2459 2460 #ifndef OPENSSL_NO_GOST 2461 static int 2462 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2463 { 2464 CBB cbb_signature; 2465 EVP_MD_CTX mctx; 2466 EVP_PKEY_CTX *pctx; 2467 EVP_PKEY *pkey; 2468 const EVP_MD *md; 2469 const unsigned char *hdata; 2470 unsigned char *signature = NULL; 2471 size_t signature_len; 2472 size_t hdata_len; 2473 int nid; 2474 int ret = 0; 2475 2476 EVP_MD_CTX_init(&mctx); 2477 2478 pkey = s->cert->key->privatekey; 2479 2480 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2481 SSLerror(s, ERR_R_INTERNAL_ERROR); 2482 goto err; 2483 } 2484 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2485 (md = EVP_get_digestbynid(nid)) == NULL) { 2486 SSLerror(s, ERR_R_EVP_LIB); 2487 goto err; 2488 } 2489 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2490 SSLerror(s, ERR_R_EVP_LIB); 2491 goto err; 2492 } 2493 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2494 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2495 SSLerror(s, ERR_R_EVP_LIB); 2496 goto err; 2497 } 2498 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2499 SSLerror(s, ERR_R_EVP_LIB); 2500 goto err; 2501 } 2502 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2503 signature_len == 0) { 2504 SSLerror(s, ERR_R_EVP_LIB); 2505 goto err; 2506 } 2507 if ((signature = calloc(1, signature_len)) == NULL) { 2508 SSLerror(s, ERR_R_MALLOC_FAILURE); 2509 goto err; 2510 } 2511 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2512 SSLerror(s, ERR_R_EVP_LIB); 2513 goto err; 2514 } 2515 2516 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2517 goto err; 2518 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2519 goto err; 2520 if (!CBB_flush(cert_verify)) 2521 goto err; 2522 2523 ret = 1; 2524 err: 2525 EVP_MD_CTX_cleanup(&mctx); 2526 free(signature); 2527 return ret; 2528 } 2529 #endif 2530 2531 int 2532 ssl3_send_client_verify(SSL *s) 2533 { 2534 CBB cbb, cert_verify; 2535 EVP_PKEY *pkey; 2536 2537 memset(&cbb, 0, sizeof(cbb)); 2538 2539 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2540 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2541 SSL3_MT_CERTIFICATE_VERIFY)) 2542 goto err; 2543 2544 pkey = s->cert->key->privatekey; 2545 2546 /* 2547 * For TLS v1.2 send signature algorithm and signature 2548 * using agreed digest and cached handshake records. 2549 */ 2550 if (SSL_USE_SIGALGS(s)) { 2551 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2552 goto err; 2553 } else if (pkey->type == EVP_PKEY_RSA) { 2554 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2555 goto err; 2556 } else if (pkey->type == EVP_PKEY_EC) { 2557 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2558 goto err; 2559 #ifndef OPENSSL_NO_GOST 2560 } else if (pkey->type == NID_id_GostR3410_94 || 2561 pkey->type == NID_id_GostR3410_2001) { 2562 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2563 goto err; 2564 #endif 2565 } else { 2566 SSLerror(s, ERR_R_INTERNAL_ERROR); 2567 goto err; 2568 } 2569 2570 tls1_transcript_free(s); 2571 2572 if (!ssl3_handshake_msg_finish(s, &cbb)) 2573 goto err; 2574 2575 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2576 } 2577 2578 return (ssl3_handshake_write(s)); 2579 2580 err: 2581 CBB_cleanup(&cbb); 2582 2583 return (-1); 2584 } 2585 2586 int 2587 ssl3_send_client_certificate(SSL *s) 2588 { 2589 EVP_PKEY *pkey = NULL; 2590 X509 *x509 = NULL; 2591 CBB cbb, client_cert; 2592 int i; 2593 2594 memset(&cbb, 0, sizeof(cbb)); 2595 2596 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2597 if (s->cert->key->x509 == NULL || 2598 s->cert->key->privatekey == NULL) 2599 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2600 else 2601 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2602 } 2603 2604 /* We need to get a client cert */ 2605 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2606 /* 2607 * If we get an error, we need to 2608 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2609 * We then get retied later 2610 */ 2611 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2612 if (i < 0) { 2613 s->internal->rwstate = SSL_X509_LOOKUP; 2614 return (-1); 2615 } 2616 s->internal->rwstate = SSL_NOTHING; 2617 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2618 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2619 if (!SSL_use_certificate(s, x509) || 2620 !SSL_use_PrivateKey(s, pkey)) 2621 i = 0; 2622 } else if (i == 1) { 2623 i = 0; 2624 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2625 } 2626 2627 X509_free(x509); 2628 EVP_PKEY_free(pkey); 2629 if (i == 0) { 2630 S3I(s)->tmp.cert_req = 2; 2631 2632 /* There is no client certificate to verify. */ 2633 tls1_transcript_free(s); 2634 } 2635 2636 /* Ok, we have a cert */ 2637 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2638 } 2639 2640 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2641 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2642 SSL3_MT_CERTIFICATE)) 2643 goto err; 2644 if (!ssl3_output_cert_chain(s, &client_cert, 2645 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key)) 2646 goto err; 2647 if (!ssl3_handshake_msg_finish(s, &cbb)) 2648 goto err; 2649 2650 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2651 } 2652 2653 /* SSL3_ST_CW_CERT_D */ 2654 return (ssl3_handshake_write(s)); 2655 2656 err: 2657 CBB_cleanup(&cbb); 2658 2659 return (0); 2660 } 2661 2662 #define has_bits(i,m) (((i)&(m)) == (m)) 2663 2664 int 2665 ssl3_check_cert_and_algorithm(SSL *s) 2666 { 2667 int i, idx; 2668 long alg_k, alg_a; 2669 EVP_PKEY *pkey = NULL; 2670 SESS_CERT *sc; 2671 DH *dh; 2672 2673 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2674 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2675 2676 /* We don't have a certificate. */ 2677 if (alg_a & SSL_aNULL) 2678 return (1); 2679 2680 sc = SSI(s)->sess_cert; 2681 if (sc == NULL) { 2682 SSLerror(s, ERR_R_INTERNAL_ERROR); 2683 goto err; 2684 } 2685 dh = SSI(s)->sess_cert->peer_dh_tmp; 2686 2687 /* This is the passed certificate. */ 2688 2689 idx = sc->peer_cert_type; 2690 if (idx == SSL_PKEY_ECC) { 2691 if (ssl_check_srvr_ecc_cert_and_alg( 2692 sc->peer_pkeys[idx].x509, s) == 0) { 2693 /* check failed */ 2694 SSLerror(s, SSL_R_BAD_ECC_CERT); 2695 goto f_err; 2696 } else { 2697 return (1); 2698 } 2699 } 2700 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2701 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2702 EVP_PKEY_free(pkey); 2703 2704 /* Check that we have a certificate if we require one. */ 2705 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2706 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2707 goto f_err; 2708 } 2709 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2710 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2711 goto f_err; 2712 } 2713 if ((alg_k & SSL_kDHE) && 2714 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2715 SSLerror(s, SSL_R_MISSING_DH_KEY); 2716 goto f_err; 2717 } 2718 2719 return (1); 2720 f_err: 2721 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2722 err: 2723 return (0); 2724 } 2725 2726 /* 2727 * Check to see if handshake is full or resumed. Usually this is just a 2728 * case of checking to see if a cache hit has occurred. In the case of 2729 * session tickets we have to check the next message to be sure. 2730 */ 2731 2732 int 2733 ssl3_check_finished(SSL *s) 2734 { 2735 int ok; 2736 long n; 2737 2738 /* If we have no ticket it cannot be a resumed session. */ 2739 if (!s->session->tlsext_tick) 2740 return (1); 2741 /* this function is called when we really expect a Certificate 2742 * message, so permit appropriate message length */ 2743 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2744 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2745 if (!ok) 2746 return ((int)n); 2747 2748 S3I(s)->tmp.reuse_message = 1; 2749 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2750 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2751 return (2); 2752 2753 return (1); 2754 } 2755 2756 int 2757 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2758 { 2759 int i = 0; 2760 2761 #ifndef OPENSSL_NO_ENGINE 2762 if (s->ctx->internal->client_cert_engine) { 2763 i = ENGINE_load_ssl_client_cert( 2764 s->ctx->internal->client_cert_engine, s, 2765 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2766 if (i != 0) 2767 return (i); 2768 } 2769 #endif 2770 if (s->ctx->internal->client_cert_cb) 2771 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2772 return (i); 2773 } 2774