1 /* $OpenBSD: ssl_clnt.c,v 1.73 2020/09/24 18:12:00 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 = 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 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_server_hello(SSL *s) 798 { 799 CBS cbs, server_random, session_id; 800 uint16_t server_version, cipher_suite; 801 uint16_t min_version, max_version; 802 uint8_t compression_method; 803 const SSL_CIPHER *cipher; 804 const SSL_METHOD *method; 805 unsigned long alg_k; 806 size_t outlen; 807 int al, ok; 808 long n; 809 810 s->internal->first_packet = 1; 811 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_HELLO_A, 812 SSL3_ST_CR_SRVR_HELLO_B, -1, 20000, /* ?? */ &ok); 813 if (!ok) 814 return ((int)n); 815 s->internal->first_packet = 0; 816 817 if (n < 0) 818 goto truncated; 819 820 CBS_init(&cbs, s->internal->init_msg, n); 821 822 if (SSL_IS_DTLS(s)) { 823 if (S3I(s)->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST) { 824 if (D1I(s)->send_cookie == 0) { 825 S3I(s)->tmp.reuse_message = 1; 826 return (1); 827 } else { 828 /* Already sent a cookie. */ 829 al = SSL_AD_UNEXPECTED_MESSAGE; 830 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 831 goto f_err; 832 } 833 } 834 } 835 836 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_HELLO) { 837 al = SSL_AD_UNEXPECTED_MESSAGE; 838 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 839 goto f_err; 840 } 841 842 if (!CBS_get_u16(&cbs, &server_version)) 843 goto truncated; 844 845 if (ssl_supported_version_range(s, &min_version, &max_version) != 1) { 846 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 847 goto err; 848 } 849 850 if (server_version < min_version || server_version > max_version) { 851 SSLerror(s, SSL_R_WRONG_SSL_VERSION); 852 s->version = (s->version & 0xff00) | (server_version & 0xff); 853 al = SSL_AD_PROTOCOL_VERSION; 854 goto f_err; 855 } 856 s->version = server_version; 857 858 if ((method = ssl_get_client_method(server_version)) == NULL) { 859 SSLerror(s, ERR_R_INTERNAL_ERROR); 860 goto err; 861 } 862 s->method = method; 863 864 /* Server random. */ 865 if (!CBS_get_bytes(&cbs, &server_random, SSL3_RANDOM_SIZE)) 866 goto truncated; 867 if (!CBS_write_bytes(&server_random, s->s3->server_random, 868 sizeof(s->s3->server_random), NULL)) 869 goto err; 870 871 if (!ssl_downgrade_max_version(s, &max_version)) 872 goto err; 873 if (!SSL_IS_DTLS(s) && max_version >= TLS1_2_VERSION && 874 s->version < max_version) { 875 /* 876 * RFC 8446 section 4.1.3. We must not downgrade if the server 877 * random value contains the TLS 1.2 or TLS 1.1 magical value. 878 */ 879 if (!CBS_skip(&server_random, 880 CBS_len(&server_random) - sizeof(tls13_downgrade_12))) 881 goto err; 882 if (s->version == TLS1_2_VERSION && 883 CBS_mem_equal(&server_random, tls13_downgrade_12, 884 sizeof(tls13_downgrade_12))) { 885 al = SSL_AD_ILLEGAL_PARAMETER; 886 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 887 goto f_err; 888 } 889 if (CBS_mem_equal(&server_random, tls13_downgrade_11, 890 sizeof(tls13_downgrade_11))) { 891 al = SSL_AD_ILLEGAL_PARAMETER; 892 SSLerror(s, SSL_R_INAPPROPRIATE_FALLBACK); 893 goto f_err; 894 } 895 } 896 897 /* Session ID. */ 898 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 899 goto truncated; 900 901 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 902 al = SSL_AD_ILLEGAL_PARAMETER; 903 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 904 goto f_err; 905 } 906 907 /* Cipher suite. */ 908 if (!CBS_get_u16(&cbs, &cipher_suite)) 909 goto truncated; 910 911 /* 912 * Check if we want to resume the session based on external 913 * pre-shared secret. 914 */ 915 if (s->internal->tls_session_secret_cb) { 916 SSL_CIPHER *pref_cipher = NULL; 917 s->session->master_key_length = sizeof(s->session->master_key); 918 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 919 &s->session->master_key_length, NULL, &pref_cipher, 920 s->internal->tls_session_secret_cb_arg)) { 921 s->session->cipher = pref_cipher ? pref_cipher : 922 ssl3_get_cipher_by_value(cipher_suite); 923 s->s3->flags |= SSL3_FLAGS_CCS_OK; 924 } 925 } 926 927 if (s->session->session_id_length != 0 && 928 CBS_mem_equal(&session_id, s->session->session_id, 929 s->session->session_id_length)) { 930 if (s->sid_ctx_length != s->session->sid_ctx_length || 931 timingsafe_memcmp(s->session->sid_ctx, 932 s->sid_ctx, s->sid_ctx_length) != 0) { 933 /* actually a client application bug */ 934 al = SSL_AD_ILLEGAL_PARAMETER; 935 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 936 goto f_err; 937 } 938 s->s3->flags |= SSL3_FLAGS_CCS_OK; 939 s->internal->hit = 1; 940 } else { 941 /* a miss or crap from the other end */ 942 943 /* If we were trying for session-id reuse, make a new 944 * SSL_SESSION so we don't stuff up other people */ 945 s->internal->hit = 0; 946 if (s->session->session_id_length > 0) { 947 if (!ssl_get_new_session(s, 0)) { 948 al = SSL_AD_INTERNAL_ERROR; 949 goto f_err; 950 } 951 } 952 953 /* 954 * XXX - improve the handling for the case where there is a 955 * zero length session identifier. 956 */ 957 if (!CBS_write_bytes(&session_id, s->session->session_id, 958 sizeof(s->session->session_id), &outlen)) 959 goto err; 960 s->session->session_id_length = outlen; 961 962 s->session->ssl_version = s->version; 963 } 964 965 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 966 al = SSL_AD_ILLEGAL_PARAMETER; 967 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 968 goto f_err; 969 } 970 971 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 972 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 973 (TLS1_get_version(s) < TLS1_2_VERSION)) { 974 al = SSL_AD_ILLEGAL_PARAMETER; 975 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 976 goto f_err; 977 } 978 979 if (!ssl_cipher_in_list(SSL_get_ciphers(s), cipher)) { 980 /* we did not say we would use this cipher */ 981 al = SSL_AD_ILLEGAL_PARAMETER; 982 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 983 goto f_err; 984 } 985 986 /* 987 * Depending on the session caching (internal/external), the cipher 988 * and/or cipher_id values may not be set. Make sure that 989 * cipher_id is set and use it for comparison. 990 */ 991 if (s->session->cipher) 992 s->session->cipher_id = s->session->cipher->id; 993 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 994 al = SSL_AD_ILLEGAL_PARAMETER; 995 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 996 goto f_err; 997 } 998 S3I(s)->hs.new_cipher = cipher; 999 1000 if (!tls1_transcript_hash_init(s)) 1001 goto err; 1002 1003 /* 1004 * Don't digest cached records if no sigalgs: we may need them for 1005 * client authentication. 1006 */ 1007 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1008 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1009 tls1_transcript_free(s); 1010 1011 if (!CBS_get_u8(&cbs, &compression_method)) 1012 goto truncated; 1013 1014 if (compression_method != 0) { 1015 al = SSL_AD_ILLEGAL_PARAMETER; 1016 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1017 goto f_err; 1018 } 1019 1020 if (!tlsext_client_parse(s, SSL_TLSEXT_MSG_SH, &cbs, &al)) { 1021 SSLerror(s, SSL_R_PARSE_TLSEXT); 1022 goto f_err; 1023 } 1024 1025 /* 1026 * Determine if we need to see RI. Strictly speaking if we want to 1027 * avoid an attack we should *always* see RI even on initial server 1028 * hello because the client doesn't see any renegotiation during an 1029 * attack. However this would mean we could not connect to any server 1030 * which doesn't support RI so for the immediate future tolerate RI 1031 * absence on initial connect only. 1032 */ 1033 if (!S3I(s)->renegotiate_seen && 1034 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1035 al = SSL_AD_HANDSHAKE_FAILURE; 1036 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1037 goto f_err; 1038 } 1039 1040 if (ssl_check_serverhello_tlsext(s) <= 0) { 1041 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1042 goto err; 1043 } 1044 1045 return (1); 1046 1047 truncated: 1048 /* wrong packet length */ 1049 al = SSL_AD_DECODE_ERROR; 1050 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1051 f_err: 1052 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1053 err: 1054 return (-1); 1055 } 1056 1057 int 1058 ssl3_get_server_certificate(SSL *s) 1059 { 1060 int al, i, ok, ret = -1; 1061 long n; 1062 CBS cbs, cert_list; 1063 X509 *x = NULL; 1064 const unsigned char *q; 1065 STACK_OF(X509) *sk = NULL; 1066 SESS_CERT *sc; 1067 EVP_PKEY *pkey = NULL; 1068 1069 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1070 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1071 if (!ok) 1072 return ((int)n); 1073 1074 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1075 S3I(s)->tmp.reuse_message = 1; 1076 return (1); 1077 } 1078 1079 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1080 al = SSL_AD_UNEXPECTED_MESSAGE; 1081 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1082 goto f_err; 1083 } 1084 1085 1086 if ((sk = sk_X509_new_null()) == NULL) { 1087 SSLerror(s, ERR_R_MALLOC_FAILURE); 1088 goto err; 1089 } 1090 1091 if (n < 0) 1092 goto truncated; 1093 1094 CBS_init(&cbs, s->internal->init_msg, n); 1095 if (CBS_len(&cbs) < 3) 1096 goto truncated; 1097 1098 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1099 CBS_len(&cbs) != 0) { 1100 al = SSL_AD_DECODE_ERROR; 1101 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1102 goto f_err; 1103 } 1104 1105 while (CBS_len(&cert_list) > 0) { 1106 CBS cert; 1107 1108 if (CBS_len(&cert_list) < 3) 1109 goto truncated; 1110 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1111 al = SSL_AD_DECODE_ERROR; 1112 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1113 goto f_err; 1114 } 1115 1116 q = CBS_data(&cert); 1117 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1118 if (x == NULL) { 1119 al = SSL_AD_BAD_CERTIFICATE; 1120 SSLerror(s, ERR_R_ASN1_LIB); 1121 goto f_err; 1122 } 1123 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1124 al = SSL_AD_DECODE_ERROR; 1125 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1126 goto f_err; 1127 } 1128 if (!sk_X509_push(sk, x)) { 1129 SSLerror(s, ERR_R_MALLOC_FAILURE); 1130 goto err; 1131 } 1132 x = NULL; 1133 } 1134 1135 i = ssl_verify_cert_chain(s, sk); 1136 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1137 al = ssl_verify_alarm_type(s->verify_result); 1138 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1139 goto f_err; 1140 1141 } 1142 ERR_clear_error(); /* but we keep s->verify_result */ 1143 1144 sc = ssl_sess_cert_new(); 1145 if (sc == NULL) 1146 goto err; 1147 ssl_sess_cert_free(SSI(s)->sess_cert); 1148 SSI(s)->sess_cert = sc; 1149 1150 sc->cert_chain = sk; 1151 /* 1152 * Inconsistency alert: cert_chain does include the peer's 1153 * certificate, which we don't include in s3_srvr.c 1154 */ 1155 x = sk_X509_value(sk, 0); 1156 sk = NULL; 1157 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1158 1159 pkey = X509_get_pubkey(x); 1160 1161 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1162 x = NULL; 1163 al = SSL3_AL_FATAL; 1164 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1165 goto f_err; 1166 } 1167 1168 i = ssl_cert_type(x, pkey); 1169 if (i < 0) { 1170 x = NULL; 1171 al = SSL3_AL_FATAL; 1172 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1173 goto f_err; 1174 } 1175 1176 sc->peer_cert_type = i; 1177 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1178 /* 1179 * Why would the following ever happen? 1180 * We just created sc a couple of lines ago. 1181 */ 1182 X509_free(sc->peer_pkeys[i].x509); 1183 sc->peer_pkeys[i].x509 = x; 1184 sc->peer_key = &(sc->peer_pkeys[i]); 1185 1186 X509_free(s->session->peer); 1187 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1188 s->session->peer = x; 1189 s->session->verify_result = s->verify_result; 1190 1191 x = NULL; 1192 ret = 1; 1193 1194 if (0) { 1195 truncated: 1196 /* wrong packet length */ 1197 al = SSL_AD_DECODE_ERROR; 1198 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1199 f_err: 1200 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1201 } 1202 err: 1203 EVP_PKEY_free(pkey); 1204 X509_free(x); 1205 sk_X509_pop_free(sk, X509_free); 1206 1207 return (ret); 1208 } 1209 1210 static int 1211 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1212 { 1213 CBS dhp, dhg, dhpk; 1214 BN_CTX *bn_ctx = NULL; 1215 SESS_CERT *sc = NULL; 1216 DH *dh = NULL; 1217 long alg_a; 1218 int al; 1219 1220 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1221 sc = SSI(s)->sess_cert; 1222 1223 if ((dh = DH_new()) == NULL) { 1224 SSLerror(s, ERR_R_DH_LIB); 1225 goto err; 1226 } 1227 1228 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1229 goto truncated; 1230 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1231 SSLerror(s, ERR_R_BN_LIB); 1232 goto err; 1233 } 1234 1235 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1236 goto truncated; 1237 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1238 SSLerror(s, ERR_R_BN_LIB); 1239 goto err; 1240 } 1241 1242 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1243 goto truncated; 1244 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1245 NULL)) == NULL) { 1246 SSLerror(s, ERR_R_BN_LIB); 1247 goto err; 1248 } 1249 1250 /* 1251 * Check the strength of the DH key just constructed. 1252 * Discard keys weaker than 1024 bits. 1253 */ 1254 if (DH_size(dh) < 1024 / 8) { 1255 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1256 goto err; 1257 } 1258 1259 if (alg_a & SSL_aRSA) 1260 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1261 else 1262 /* XXX - Anonymous DH, so no certificate or pkey. */ 1263 *pkey = NULL; 1264 1265 sc->peer_dh_tmp = dh; 1266 1267 return (1); 1268 1269 truncated: 1270 al = SSL_AD_DECODE_ERROR; 1271 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1272 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1273 1274 err: 1275 DH_free(dh); 1276 BN_CTX_free(bn_ctx); 1277 1278 return (-1); 1279 } 1280 1281 static int 1282 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1283 { 1284 EC_KEY *ecdh = NULL; 1285 int ret = -1; 1286 1287 /* Extract the server's ephemeral ECDH public key. */ 1288 if ((ecdh = EC_KEY_new()) == NULL) { 1289 SSLerror(s, ERR_R_MALLOC_FAILURE); 1290 goto err; 1291 } 1292 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1293 SSLerror(s, SSL_R_BAD_ECPOINT); 1294 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1295 goto err; 1296 } 1297 1298 sc->peer_nid = nid; 1299 sc->peer_ecdh_tmp = ecdh; 1300 ecdh = NULL; 1301 1302 ret = 1; 1303 1304 err: 1305 EC_KEY_free(ecdh); 1306 1307 return (ret); 1308 } 1309 1310 static int 1311 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1312 { 1313 size_t outlen; 1314 1315 if (nid != NID_X25519) { 1316 SSLerror(s, ERR_R_INTERNAL_ERROR); 1317 goto err; 1318 } 1319 1320 if (CBS_len(public) != X25519_KEY_LENGTH) { 1321 SSLerror(s, SSL_R_BAD_ECPOINT); 1322 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1323 goto err; 1324 } 1325 1326 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1327 SSLerror(s, ERR_R_MALLOC_FAILURE); 1328 goto err; 1329 } 1330 1331 return (1); 1332 1333 err: 1334 return (-1); 1335 } 1336 1337 static int 1338 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1339 { 1340 CBS public; 1341 uint8_t curve_type; 1342 uint16_t curve_id; 1343 SESS_CERT *sc; 1344 long alg_a; 1345 int nid; 1346 int al; 1347 1348 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1349 sc = SSI(s)->sess_cert; 1350 1351 /* Only named curves are supported. */ 1352 if (!CBS_get_u8(cbs, &curve_type) || 1353 curve_type != NAMED_CURVE_TYPE || 1354 !CBS_get_u16(cbs, &curve_id)) { 1355 al = SSL_AD_DECODE_ERROR; 1356 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1357 goto f_err; 1358 } 1359 1360 /* 1361 * Check that the curve is one of our preferences - if it is not, 1362 * the server has sent us an invalid curve. 1363 */ 1364 if (tls1_check_curve(s, curve_id) != 1) { 1365 al = SSL_AD_DECODE_ERROR; 1366 SSLerror(s, SSL_R_WRONG_CURVE); 1367 goto f_err; 1368 } 1369 1370 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1371 al = SSL_AD_INTERNAL_ERROR; 1372 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1373 goto f_err; 1374 } 1375 1376 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1377 goto truncated; 1378 1379 if (nid == NID_X25519) { 1380 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1381 goto err; 1382 } else { 1383 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1384 goto err; 1385 } 1386 1387 /* 1388 * The ECC/TLS specification does not mention the use of DSA to sign 1389 * ECParameters in the server key exchange message. We do support RSA 1390 * and ECDSA. 1391 */ 1392 if (alg_a & SSL_aRSA) 1393 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1394 else if (alg_a & SSL_aECDSA) 1395 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1396 else 1397 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1398 *pkey = NULL; 1399 1400 return (1); 1401 1402 truncated: 1403 al = SSL_AD_DECODE_ERROR; 1404 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1405 1406 f_err: 1407 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1408 1409 err: 1410 return (-1); 1411 } 1412 1413 int 1414 ssl3_get_server_key_exchange(SSL *s) 1415 { 1416 CBS cbs, signature; 1417 const EVP_MD *md = NULL; 1418 EVP_PKEY *pkey = NULL; 1419 EVP_MD_CTX md_ctx; 1420 const unsigned char *param; 1421 long n, alg_k, alg_a; 1422 int al, ok; 1423 size_t param_len; 1424 1425 EVP_MD_CTX_init(&md_ctx); 1426 1427 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1428 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1429 1430 /* 1431 * Use same message size as in ssl3_get_certificate_request() 1432 * as ServerKeyExchange message may be skipped. 1433 */ 1434 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1435 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1436 if (!ok) 1437 return ((int)n); 1438 1439 if (n < 0) 1440 goto err; 1441 1442 CBS_init(&cbs, s->internal->init_msg, n); 1443 1444 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1445 /* 1446 * Do not skip server key exchange if this cipher suite uses 1447 * ephemeral keys. 1448 */ 1449 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1450 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1451 al = SSL_AD_UNEXPECTED_MESSAGE; 1452 goto f_err; 1453 } 1454 1455 S3I(s)->tmp.reuse_message = 1; 1456 EVP_MD_CTX_cleanup(&md_ctx); 1457 return (1); 1458 } 1459 1460 if (SSI(s)->sess_cert != NULL) { 1461 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1462 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1463 1464 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1465 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1466 1467 free(SSI(s)->sess_cert->peer_x25519_tmp); 1468 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1469 } else { 1470 SSI(s)->sess_cert = ssl_sess_cert_new(); 1471 if (SSI(s)->sess_cert == NULL) 1472 goto err; 1473 } 1474 1475 param = CBS_data(&cbs); 1476 param_len = CBS_len(&cbs); 1477 1478 if (alg_k & SSL_kDHE) { 1479 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1480 goto err; 1481 } else if (alg_k & SSL_kECDHE) { 1482 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1483 goto err; 1484 } else if (alg_k != 0) { 1485 al = SSL_AD_UNEXPECTED_MESSAGE; 1486 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1487 goto f_err; 1488 } 1489 1490 param_len -= CBS_len(&cbs); 1491 1492 /* if it was signed, check the signature */ 1493 if (pkey != NULL) { 1494 EVP_PKEY_CTX *pctx; 1495 const struct ssl_sigalg *sigalg; 1496 1497 if (SSL_USE_SIGALGS(s)) { 1498 uint16_t sigalg_value; 1499 1500 if (!CBS_get_u16(&cbs, &sigalg_value)) 1501 goto truncated; 1502 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1503 tls12_sigalgs_len)) == NULL) { 1504 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1505 al = SSL_AD_DECODE_ERROR; 1506 goto f_err; 1507 } 1508 if ((md = sigalg->md()) == NULL) { 1509 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1510 al = SSL_AD_DECODE_ERROR; 1511 goto f_err; 1512 } 1513 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 1514 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1515 al = SSL_AD_DECODE_ERROR; 1516 goto f_err; 1517 } 1518 } else if (pkey->type == EVP_PKEY_RSA) { 1519 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1520 } else if (pkey->type == EVP_PKEY_EC) { 1521 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1522 } else { 1523 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1524 al = SSL_AD_DECODE_ERROR; 1525 goto f_err; 1526 } 1527 md = sigalg->md(); 1528 1529 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1530 goto truncated; 1531 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1532 al = SSL_AD_DECODE_ERROR; 1533 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1534 goto f_err; 1535 } 1536 1537 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1538 goto err; 1539 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1540 SSL3_RANDOM_SIZE)) 1541 goto err; 1542 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1543 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1544 RSA_PKCS1_PSS_PADDING) || 1545 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1546 goto err; 1547 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1548 SSL3_RANDOM_SIZE)) 1549 goto err; 1550 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1551 goto err; 1552 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1553 CBS_len(&signature)) <= 0) { 1554 al = SSL_AD_DECRYPT_ERROR; 1555 SSLerror(s, SSL_R_BAD_SIGNATURE); 1556 goto f_err; 1557 } 1558 } else { 1559 /* aNULL does not need public keys. */ 1560 if (!(alg_a & SSL_aNULL)) { 1561 SSLerror(s, ERR_R_INTERNAL_ERROR); 1562 goto err; 1563 } 1564 } 1565 1566 if (CBS_len(&cbs) != 0) { 1567 al = SSL_AD_DECODE_ERROR; 1568 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1569 goto f_err; 1570 } 1571 1572 EVP_PKEY_free(pkey); 1573 EVP_MD_CTX_cleanup(&md_ctx); 1574 1575 return (1); 1576 1577 truncated: 1578 al = SSL_AD_DECODE_ERROR; 1579 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1580 1581 f_err: 1582 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1583 1584 err: 1585 EVP_PKEY_free(pkey); 1586 EVP_MD_CTX_cleanup(&md_ctx); 1587 1588 return (-1); 1589 } 1590 1591 int 1592 ssl3_get_certificate_request(SSL *s) 1593 { 1594 int ok, ret = 0; 1595 long n; 1596 uint8_t ctype_num; 1597 CBS cert_request, ctypes, rdn_list; 1598 X509_NAME *xn = NULL; 1599 const unsigned char *q; 1600 STACK_OF(X509_NAME) *ca_sk = NULL; 1601 1602 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1603 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1604 if (!ok) 1605 return ((int)n); 1606 1607 S3I(s)->tmp.cert_req = 0; 1608 1609 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1610 S3I(s)->tmp.reuse_message = 1; 1611 /* 1612 * If we get here we don't need any cached handshake records 1613 * as we wont be doing client auth. 1614 */ 1615 tls1_transcript_free(s); 1616 return (1); 1617 } 1618 1619 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1620 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1621 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1622 goto err; 1623 } 1624 1625 /* TLS does not like anon-DH with client cert */ 1626 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1627 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1628 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1629 goto err; 1630 } 1631 1632 if (n < 0) 1633 goto truncated; 1634 CBS_init(&cert_request, s->internal->init_msg, n); 1635 1636 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1637 SSLerror(s, ERR_R_MALLOC_FAILURE); 1638 goto err; 1639 } 1640 1641 /* get the certificate types */ 1642 if (!CBS_get_u8(&cert_request, &ctype_num)) 1643 goto truncated; 1644 1645 if (ctype_num > SSL3_CT_NUMBER) 1646 ctype_num = SSL3_CT_NUMBER; 1647 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1648 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1649 sizeof(S3I(s)->tmp.ctype), NULL)) { 1650 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1651 goto err; 1652 } 1653 1654 if (SSL_USE_SIGALGS(s)) { 1655 CBS sigalgs; 1656 1657 if (CBS_len(&cert_request) < 2) { 1658 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1659 goto err; 1660 } 1661 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1662 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1663 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1664 goto err; 1665 } 1666 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1667 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1668 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1669 goto err; 1670 } 1671 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1672 &S3I(s)->hs.sigalgs_len)) 1673 goto err; 1674 } 1675 1676 /* get the CA RDNs */ 1677 if (CBS_len(&cert_request) < 2) { 1678 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1679 goto err; 1680 } 1681 1682 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1683 CBS_len(&cert_request) != 0) { 1684 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1685 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1686 goto err; 1687 } 1688 1689 while (CBS_len(&rdn_list) > 0) { 1690 CBS rdn; 1691 1692 if (CBS_len(&rdn_list) < 2) { 1693 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1694 goto err; 1695 } 1696 1697 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1698 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1699 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1700 goto err; 1701 } 1702 1703 q = CBS_data(&rdn); 1704 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1705 ssl3_send_alert(s, SSL3_AL_FATAL, 1706 SSL_AD_DECODE_ERROR); 1707 SSLerror(s, ERR_R_ASN1_LIB); 1708 goto err; 1709 } 1710 1711 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1712 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1713 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1714 goto err; 1715 } 1716 if (!sk_X509_NAME_push(ca_sk, xn)) { 1717 SSLerror(s, ERR_R_MALLOC_FAILURE); 1718 goto err; 1719 } 1720 xn = NULL; /* avoid free in err block */ 1721 } 1722 1723 /* we should setup a certificate to return.... */ 1724 S3I(s)->tmp.cert_req = 1; 1725 S3I(s)->tmp.ctype_num = ctype_num; 1726 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1727 S3I(s)->tmp.ca_names = ca_sk; 1728 ca_sk = NULL; 1729 1730 ret = 1; 1731 if (0) { 1732 truncated: 1733 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1734 } 1735 err: 1736 X509_NAME_free(xn); 1737 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1738 return (ret); 1739 } 1740 1741 static int 1742 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1743 { 1744 return (X509_NAME_cmp(*a, *b)); 1745 } 1746 1747 int 1748 ssl3_get_new_session_ticket(SSL *s) 1749 { 1750 int ok, al, ret = 0; 1751 uint32_t lifetime_hint; 1752 long n; 1753 CBS cbs, session_ticket; 1754 1755 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1756 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1757 if (!ok) 1758 return ((int)n); 1759 1760 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1761 S3I(s)->tmp.reuse_message = 1; 1762 return (1); 1763 } 1764 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1765 al = SSL_AD_UNEXPECTED_MESSAGE; 1766 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1767 goto f_err; 1768 } 1769 1770 if (n < 0) { 1771 al = SSL_AD_DECODE_ERROR; 1772 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1773 goto f_err; 1774 } 1775 1776 CBS_init(&cbs, s->internal->init_msg, n); 1777 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1778 #if UINT32_MAX > LONG_MAX 1779 lifetime_hint > LONG_MAX || 1780 #endif 1781 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1782 CBS_len(&cbs) != 0) { 1783 al = SSL_AD_DECODE_ERROR; 1784 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1785 goto f_err; 1786 } 1787 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1788 1789 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1790 &s->session->tlsext_ticklen)) { 1791 SSLerror(s, ERR_R_MALLOC_FAILURE); 1792 goto err; 1793 } 1794 1795 /* 1796 * There are two ways to detect a resumed ticket sesion. 1797 * One is to set an appropriate session ID and then the server 1798 * must return a match in ServerHello. This allows the normal 1799 * client session ID matching to work and we know much 1800 * earlier that the ticket has been accepted. 1801 * 1802 * The other way is to set zero length session ID when the 1803 * ticket is presented and rely on the handshake to determine 1804 * session resumption. 1805 * 1806 * We choose the former approach because this fits in with 1807 * assumptions elsewhere in OpenSSL. The session ID is set 1808 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1809 * ticket. 1810 */ 1811 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1812 s->session->session_id, &s->session->session_id_length, 1813 EVP_sha256(), NULL); 1814 ret = 1; 1815 return (ret); 1816 f_err: 1817 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1818 err: 1819 return (-1); 1820 } 1821 1822 int 1823 ssl3_get_cert_status(SSL *s) 1824 { 1825 CBS cert_status, response; 1826 int ok, al; 1827 long n; 1828 uint8_t status_type; 1829 1830 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1831 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1832 16384, &ok); 1833 if (!ok) 1834 return ((int)n); 1835 1836 if (n < 0) { 1837 /* need at least status type + length */ 1838 al = SSL_AD_DECODE_ERROR; 1839 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1840 goto f_err; 1841 } 1842 1843 CBS_init(&cert_status, s->internal->init_msg, n); 1844 if (!CBS_get_u8(&cert_status, &status_type) || 1845 CBS_len(&cert_status) < 3) { 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 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1853 al = SSL_AD_DECODE_ERROR; 1854 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1855 goto f_err; 1856 } 1857 1858 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1859 CBS_len(&cert_status) != 0) { 1860 al = SSL_AD_DECODE_ERROR; 1861 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1862 goto f_err; 1863 } 1864 1865 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1866 &s->internal->tlsext_ocsp_resp_len)) { 1867 al = SSL_AD_INTERNAL_ERROR; 1868 SSLerror(s, ERR_R_MALLOC_FAILURE); 1869 goto f_err; 1870 } 1871 1872 if (s->ctx->internal->tlsext_status_cb) { 1873 int ret; 1874 ret = s->ctx->internal->tlsext_status_cb(s, 1875 s->ctx->internal->tlsext_status_arg); 1876 if (ret == 0) { 1877 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1878 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1879 goto f_err; 1880 } 1881 if (ret < 0) { 1882 al = SSL_AD_INTERNAL_ERROR; 1883 SSLerror(s, ERR_R_MALLOC_FAILURE); 1884 goto f_err; 1885 } 1886 } 1887 return (1); 1888 f_err: 1889 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1890 return (-1); 1891 } 1892 1893 int 1894 ssl3_get_server_done(SSL *s) 1895 { 1896 int ok, ret = 0; 1897 long n; 1898 1899 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1900 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1901 30, /* should be very small, like 0 :-) */ &ok); 1902 if (!ok) 1903 return ((int)n); 1904 1905 if (n > 0) { 1906 /* should contain no data */ 1907 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1908 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1909 return (-1); 1910 } 1911 ret = 1; 1912 return (ret); 1913 } 1914 1915 static int 1916 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1917 { 1918 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1919 unsigned char *enc_pms = NULL; 1920 EVP_PKEY *pkey = NULL; 1921 int ret = -1; 1922 int enc_len; 1923 CBB epms; 1924 1925 /* 1926 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1927 */ 1928 1929 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1930 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1931 pkey->pkey.rsa == NULL) { 1932 SSLerror(s, ERR_R_INTERNAL_ERROR); 1933 goto err; 1934 } 1935 1936 pms[0] = s->client_version >> 8; 1937 pms[1] = s->client_version & 0xff; 1938 arc4random_buf(&pms[2], sizeof(pms) - 2); 1939 1940 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1941 SSLerror(s, ERR_R_MALLOC_FAILURE); 1942 goto err; 1943 } 1944 1945 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1946 RSA_PKCS1_PADDING); 1947 if (enc_len <= 0) { 1948 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1949 goto err; 1950 } 1951 1952 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1953 goto err; 1954 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1955 goto err; 1956 if (!CBB_flush(cbb)) 1957 goto err; 1958 1959 s->session->master_key_length = 1960 tls1_generate_master_secret(s, 1961 s->session->master_key, pms, sizeof(pms)); 1962 1963 ret = 1; 1964 1965 err: 1966 explicit_bzero(pms, sizeof(pms)); 1967 EVP_PKEY_free(pkey); 1968 free(enc_pms); 1969 1970 return (ret); 1971 } 1972 1973 static int 1974 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1975 { 1976 DH *dh_srvr = NULL, *dh_clnt = NULL; 1977 unsigned char *key = NULL; 1978 int key_size = 0, key_len; 1979 unsigned char *data; 1980 int ret = -1; 1981 CBB dh_Yc; 1982 1983 /* Ensure that we have an ephemeral key for DHE. */ 1984 if (sess_cert->peer_dh_tmp == NULL) { 1985 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1986 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1987 goto err; 1988 } 1989 dh_srvr = sess_cert->peer_dh_tmp; 1990 1991 /* Generate a new random key. */ 1992 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 1993 SSLerror(s, ERR_R_DH_LIB); 1994 goto err; 1995 } 1996 if (!DH_generate_key(dh_clnt)) { 1997 SSLerror(s, ERR_R_DH_LIB); 1998 goto err; 1999 } 2000 if ((key_size = DH_size(dh_clnt)) <= 0) { 2001 SSLerror(s, ERR_R_DH_LIB); 2002 goto err; 2003 } 2004 if ((key = malloc(key_size)) == NULL) { 2005 SSLerror(s, ERR_R_MALLOC_FAILURE); 2006 goto err; 2007 } 2008 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2009 SSLerror(s, ERR_R_DH_LIB); 2010 goto err; 2011 } 2012 2013 /* Generate master key from the result. */ 2014 s->session->master_key_length = 2015 tls1_generate_master_secret(s, 2016 s->session->master_key, key, key_len); 2017 2018 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2019 goto err; 2020 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2021 goto err; 2022 BN_bn2bin(dh_clnt->pub_key, data); 2023 if (!CBB_flush(cbb)) 2024 goto err; 2025 2026 ret = 1; 2027 2028 err: 2029 DH_free(dh_clnt); 2030 freezero(key, key_size); 2031 2032 return (ret); 2033 } 2034 2035 static int 2036 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2037 { 2038 EC_KEY *ecdh = NULL; 2039 uint8_t *key = NULL; 2040 size_t key_len = 0; 2041 int ret = -1; 2042 CBB ecpoint; 2043 2044 if ((ecdh = EC_KEY_new()) == NULL) { 2045 SSLerror(s, ERR_R_MALLOC_FAILURE); 2046 goto err; 2047 } 2048 2049 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2050 goto err; 2051 2052 /* Encode our public key. */ 2053 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2054 goto err; 2055 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2056 goto err; 2057 if (!CBB_flush(cbb)) 2058 goto err; 2059 2060 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2061 goto err; 2062 s->session->master_key_length = tls1_generate_master_secret(s, 2063 s->session->master_key, key, key_len); 2064 2065 ret = 1; 2066 2067 err: 2068 freezero(key, key_len); 2069 EC_KEY_free(ecdh); 2070 2071 return (ret); 2072 } 2073 2074 static int 2075 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2076 { 2077 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2078 int ret = -1; 2079 CBB ecpoint; 2080 2081 /* Generate X25519 key pair and derive shared key. */ 2082 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2083 goto err; 2084 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2085 goto err; 2086 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2087 goto err; 2088 X25519_keypair(public_key, private_key); 2089 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2090 goto err; 2091 2092 /* Serialize the public key. */ 2093 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2094 goto err; 2095 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2096 goto err; 2097 if (!CBB_flush(cbb)) 2098 goto err; 2099 2100 /* Generate master key from the result. */ 2101 s->session->master_key_length = 2102 tls1_generate_master_secret(s, 2103 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2104 2105 ret = 1; 2106 2107 err: 2108 free(public_key); 2109 freezero(private_key, X25519_KEY_LENGTH); 2110 freezero(shared_key, X25519_KEY_LENGTH); 2111 2112 return (ret); 2113 } 2114 2115 static int 2116 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2117 { 2118 if (sc->peer_x25519_tmp != NULL) { 2119 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2120 goto err; 2121 } else if (sc->peer_ecdh_tmp != NULL) { 2122 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2123 goto err; 2124 } else { 2125 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2126 SSLerror(s, ERR_R_INTERNAL_ERROR); 2127 goto err; 2128 } 2129 2130 return (1); 2131 2132 err: 2133 return (-1); 2134 } 2135 2136 static int 2137 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2138 { 2139 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2140 EVP_PKEY *pub_key = NULL; 2141 EVP_PKEY_CTX *pkey_ctx; 2142 X509 *peer_cert; 2143 size_t msglen; 2144 unsigned int md_len; 2145 EVP_MD_CTX *ukm_hash; 2146 int ret = -1; 2147 int nid; 2148 CBB gostblob; 2149 2150 /* Get server sertificate PKEY and create ctx from it */ 2151 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2152 if (peer_cert == NULL) { 2153 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2154 goto err; 2155 } 2156 2157 pub_key = X509_get_pubkey(peer_cert); 2158 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2159 2160 /* 2161 * If we have send a certificate, and certificate key parameters match 2162 * those of server certificate, use certificate key for key exchange. 2163 * Otherwise, generate ephemeral key pair. 2164 */ 2165 EVP_PKEY_encrypt_init(pkey_ctx); 2166 2167 /* Generate session key. */ 2168 arc4random_buf(premaster_secret, 32); 2169 2170 /* 2171 * If we have client certificate, use its secret as peer key. 2172 */ 2173 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2174 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2175 s->cert->key->privatekey) <=0) { 2176 /* 2177 * If there was an error - just ignore it. 2178 * Ephemeral key would be used. 2179 */ 2180 ERR_clear_error(); 2181 } 2182 } 2183 2184 /* 2185 * Compute shared IV and store it in algorithm-specific context data. 2186 */ 2187 ukm_hash = EVP_MD_CTX_new(); 2188 if (ukm_hash == NULL) { 2189 SSLerror(s, ERR_R_MALLOC_FAILURE); 2190 goto err; 2191 } 2192 2193 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94) 2194 nid = NID_id_GostR3411_94; 2195 else 2196 nid = NID_id_tc26_gost3411_2012_256; 2197 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2198 goto err; 2199 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2200 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2201 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2202 EVP_MD_CTX_free(ukm_hash); 2203 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2204 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2205 SSLerror(s, SSL_R_LIBRARY_BUG); 2206 goto err; 2207 } 2208 2209 /* 2210 * Make GOST keytransport blob message, encapsulate it into sequence. 2211 */ 2212 msglen = 255; 2213 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2214 32) < 0) { 2215 SSLerror(s, SSL_R_LIBRARY_BUG); 2216 goto err; 2217 } 2218 2219 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2220 goto err; 2221 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2222 goto err; 2223 if (!CBB_flush(cbb)) 2224 goto err; 2225 2226 /* Check if pubkey from client certificate was used. */ 2227 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2228 NULL) > 0) { 2229 /* Set flag "skip certificate verify". */ 2230 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2231 } 2232 EVP_PKEY_CTX_free(pkey_ctx); 2233 s->session->master_key_length = 2234 tls1_generate_master_secret(s, 2235 s->session->master_key, premaster_secret, 32); 2236 2237 ret = 1; 2238 2239 err: 2240 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2241 EVP_PKEY_free(pub_key); 2242 2243 return (ret); 2244 } 2245 2246 int 2247 ssl3_send_client_key_exchange(SSL *s) 2248 { 2249 SESS_CERT *sess_cert; 2250 unsigned long alg_k; 2251 CBB cbb, kex; 2252 2253 memset(&cbb, 0, sizeof(cbb)); 2254 2255 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2256 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2257 2258 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2259 ssl3_send_alert(s, SSL3_AL_FATAL, 2260 SSL_AD_UNEXPECTED_MESSAGE); 2261 SSLerror(s, ERR_R_INTERNAL_ERROR); 2262 goto err; 2263 } 2264 2265 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2266 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2267 goto err; 2268 2269 if (alg_k & SSL_kRSA) { 2270 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2271 goto err; 2272 } else if (alg_k & SSL_kDHE) { 2273 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2274 goto err; 2275 } else if (alg_k & SSL_kECDHE) { 2276 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2277 goto err; 2278 } else if (alg_k & SSL_kGOST) { 2279 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2280 goto err; 2281 } else { 2282 ssl3_send_alert(s, SSL3_AL_FATAL, 2283 SSL_AD_HANDSHAKE_FAILURE); 2284 SSLerror(s, ERR_R_INTERNAL_ERROR); 2285 goto err; 2286 } 2287 2288 if (!ssl3_handshake_msg_finish(s, &cbb)) 2289 goto err; 2290 2291 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2292 } 2293 2294 /* SSL3_ST_CW_KEY_EXCH_B */ 2295 return (ssl3_handshake_write(s)); 2296 2297 err: 2298 CBB_cleanup(&cbb); 2299 2300 return (-1); 2301 } 2302 2303 static int 2304 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2305 { 2306 const struct ssl_sigalg *sigalg; 2307 CBB cbb_signature; 2308 EVP_PKEY_CTX *pctx = NULL; 2309 EVP_PKEY *pkey; 2310 EVP_MD_CTX mctx; 2311 const EVP_MD *md; 2312 const unsigned char *hdata; 2313 unsigned char *signature = NULL; 2314 size_t signature_len, hdata_len; 2315 int ret = 0; 2316 2317 EVP_MD_CTX_init(&mctx); 2318 2319 pkey = s->cert->key->privatekey; 2320 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2321 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2322 goto err; 2323 } 2324 if ((md = sigalg->md()) == NULL) { 2325 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2326 goto err; 2327 } 2328 2329 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2330 SSLerror(s, ERR_R_INTERNAL_ERROR); 2331 goto err; 2332 } 2333 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2334 SSLerror(s, ERR_R_EVP_LIB); 2335 goto err; 2336 } 2337 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2338 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2339 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2340 SSLerror(s, ERR_R_EVP_LIB); 2341 goto err; 2342 } 2343 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2344 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2345 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2346 SSLerror(s, ERR_R_EVP_LIB); 2347 goto err; 2348 } 2349 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2350 SSLerror(s, ERR_R_EVP_LIB); 2351 goto err; 2352 } 2353 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2354 signature_len == 0) { 2355 SSLerror(s, ERR_R_EVP_LIB); 2356 goto err; 2357 } 2358 if ((signature = calloc(1, signature_len)) == NULL) { 2359 SSLerror(s, ERR_R_MALLOC_FAILURE); 2360 goto err; 2361 } 2362 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2363 SSLerror(s, ERR_R_EVP_LIB); 2364 goto err; 2365 } 2366 2367 if (!CBB_add_u16(cert_verify, sigalg->value)) 2368 goto err; 2369 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2370 goto err; 2371 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2372 goto err; 2373 if (!CBB_flush(cert_verify)) 2374 goto err; 2375 2376 ret = 1; 2377 2378 err: 2379 EVP_MD_CTX_cleanup(&mctx); 2380 free(signature); 2381 return ret; 2382 } 2383 2384 static int 2385 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2386 { 2387 CBB cbb_signature; 2388 EVP_PKEY *pkey; 2389 unsigned char data[EVP_MAX_MD_SIZE]; 2390 unsigned char *signature = NULL; 2391 unsigned int signature_len; 2392 size_t data_len; 2393 int ret = 0; 2394 2395 pkey = s->cert->key->privatekey; 2396 2397 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2398 goto err; 2399 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2400 goto err; 2401 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2402 &signature_len, pkey->pkey.rsa) <= 0 ) { 2403 SSLerror(s, ERR_R_RSA_LIB); 2404 goto err; 2405 } 2406 2407 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2408 goto err; 2409 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2410 goto err; 2411 if (!CBB_flush(cert_verify)) 2412 goto err; 2413 2414 ret = 1; 2415 err: 2416 free(signature); 2417 return ret; 2418 } 2419 2420 static int 2421 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2422 { 2423 CBB cbb_signature; 2424 EVP_PKEY *pkey; 2425 unsigned char data[EVP_MAX_MD_SIZE]; 2426 unsigned char *signature = NULL; 2427 unsigned int signature_len; 2428 int ret = 0; 2429 2430 pkey = s->cert->key->privatekey; 2431 2432 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2433 goto err; 2434 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2435 goto err; 2436 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2437 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2438 SSLerror(s, ERR_R_ECDSA_LIB); 2439 goto err; 2440 } 2441 2442 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2443 goto err; 2444 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2445 goto err; 2446 if (!CBB_flush(cert_verify)) 2447 goto err; 2448 2449 ret = 1; 2450 err: 2451 free(signature); 2452 return ret; 2453 } 2454 2455 #ifndef OPENSSL_NO_GOST 2456 static int 2457 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2458 { 2459 CBB cbb_signature; 2460 EVP_MD_CTX mctx; 2461 EVP_PKEY_CTX *pctx; 2462 EVP_PKEY *pkey; 2463 const EVP_MD *md; 2464 const unsigned char *hdata; 2465 unsigned char *signature = NULL; 2466 size_t signature_len; 2467 size_t hdata_len; 2468 int nid; 2469 int ret = 0; 2470 2471 EVP_MD_CTX_init(&mctx); 2472 2473 pkey = s->cert->key->privatekey; 2474 2475 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2476 SSLerror(s, ERR_R_INTERNAL_ERROR); 2477 goto err; 2478 } 2479 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2480 (md = EVP_get_digestbynid(nid)) == NULL) { 2481 SSLerror(s, ERR_R_EVP_LIB); 2482 goto err; 2483 } 2484 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2485 SSLerror(s, ERR_R_EVP_LIB); 2486 goto err; 2487 } 2488 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2489 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2490 SSLerror(s, ERR_R_EVP_LIB); 2491 goto err; 2492 } 2493 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2494 SSLerror(s, ERR_R_EVP_LIB); 2495 goto err; 2496 } 2497 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2498 signature_len == 0) { 2499 SSLerror(s, ERR_R_EVP_LIB); 2500 goto err; 2501 } 2502 if ((signature = calloc(1, signature_len)) == NULL) { 2503 SSLerror(s, ERR_R_MALLOC_FAILURE); 2504 goto err; 2505 } 2506 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2507 SSLerror(s, ERR_R_EVP_LIB); 2508 goto err; 2509 } 2510 2511 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2512 goto err; 2513 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2514 goto err; 2515 if (!CBB_flush(cert_verify)) 2516 goto err; 2517 2518 ret = 1; 2519 err: 2520 EVP_MD_CTX_cleanup(&mctx); 2521 free(signature); 2522 return ret; 2523 } 2524 #endif 2525 2526 int 2527 ssl3_send_client_verify(SSL *s) 2528 { 2529 CBB cbb, cert_verify; 2530 EVP_PKEY *pkey; 2531 2532 memset(&cbb, 0, sizeof(cbb)); 2533 2534 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2535 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2536 SSL3_MT_CERTIFICATE_VERIFY)) 2537 goto err; 2538 2539 pkey = s->cert->key->privatekey; 2540 2541 /* 2542 * For TLS v1.2 send signature algorithm and signature 2543 * using agreed digest and cached handshake records. 2544 */ 2545 if (SSL_USE_SIGALGS(s)) { 2546 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2547 goto err; 2548 } else if (pkey->type == EVP_PKEY_RSA) { 2549 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2550 goto err; 2551 } else if (pkey->type == EVP_PKEY_EC) { 2552 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2553 goto err; 2554 #ifndef OPENSSL_NO_GOST 2555 } else if (pkey->type == NID_id_GostR3410_94 || 2556 pkey->type == NID_id_GostR3410_2001) { 2557 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2558 goto err; 2559 #endif 2560 } else { 2561 SSLerror(s, ERR_R_INTERNAL_ERROR); 2562 goto err; 2563 } 2564 2565 tls1_transcript_free(s); 2566 2567 if (!ssl3_handshake_msg_finish(s, &cbb)) 2568 goto err; 2569 2570 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2571 } 2572 2573 return (ssl3_handshake_write(s)); 2574 2575 err: 2576 CBB_cleanup(&cbb); 2577 2578 return (-1); 2579 } 2580 2581 int 2582 ssl3_send_client_certificate(SSL *s) 2583 { 2584 EVP_PKEY *pkey = NULL; 2585 X509 *x509 = NULL; 2586 CBB cbb, client_cert; 2587 int i; 2588 2589 memset(&cbb, 0, sizeof(cbb)); 2590 2591 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2592 if (s->cert->key->x509 == NULL || 2593 s->cert->key->privatekey == NULL) 2594 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2595 else 2596 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2597 } 2598 2599 /* We need to get a client cert */ 2600 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2601 /* 2602 * If we get an error, we need to 2603 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2604 * We then get retied later 2605 */ 2606 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2607 if (i < 0) { 2608 s->internal->rwstate = SSL_X509_LOOKUP; 2609 return (-1); 2610 } 2611 s->internal->rwstate = SSL_NOTHING; 2612 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2613 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2614 if (!SSL_use_certificate(s, x509) || 2615 !SSL_use_PrivateKey(s, pkey)) 2616 i = 0; 2617 } else if (i == 1) { 2618 i = 0; 2619 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2620 } 2621 2622 X509_free(x509); 2623 EVP_PKEY_free(pkey); 2624 if (i == 0) { 2625 S3I(s)->tmp.cert_req = 2; 2626 2627 /* There is no client certificate to verify. */ 2628 tls1_transcript_free(s); 2629 } 2630 2631 /* Ok, we have a cert */ 2632 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2633 } 2634 2635 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2636 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2637 SSL3_MT_CERTIFICATE)) 2638 goto err; 2639 if (!ssl3_output_cert_chain(s, &client_cert, 2640 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key)) 2641 goto err; 2642 if (!ssl3_handshake_msg_finish(s, &cbb)) 2643 goto err; 2644 2645 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2646 } 2647 2648 /* SSL3_ST_CW_CERT_D */ 2649 return (ssl3_handshake_write(s)); 2650 2651 err: 2652 CBB_cleanup(&cbb); 2653 2654 return (0); 2655 } 2656 2657 #define has_bits(i,m) (((i)&(m)) == (m)) 2658 2659 int 2660 ssl3_check_cert_and_algorithm(SSL *s) 2661 { 2662 int i, idx; 2663 long alg_k, alg_a; 2664 EVP_PKEY *pkey = NULL; 2665 SESS_CERT *sc; 2666 DH *dh; 2667 2668 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2669 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2670 2671 /* We don't have a certificate. */ 2672 if (alg_a & SSL_aNULL) 2673 return (1); 2674 2675 sc = SSI(s)->sess_cert; 2676 if (sc == NULL) { 2677 SSLerror(s, ERR_R_INTERNAL_ERROR); 2678 goto err; 2679 } 2680 dh = SSI(s)->sess_cert->peer_dh_tmp; 2681 2682 /* This is the passed certificate. */ 2683 2684 idx = sc->peer_cert_type; 2685 if (idx == SSL_PKEY_ECC) { 2686 if (ssl_check_srvr_ecc_cert_and_alg( 2687 sc->peer_pkeys[idx].x509, s) == 0) { 2688 /* check failed */ 2689 SSLerror(s, SSL_R_BAD_ECC_CERT); 2690 goto f_err; 2691 } else { 2692 return (1); 2693 } 2694 } 2695 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2696 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2697 EVP_PKEY_free(pkey); 2698 2699 /* Check that we have a certificate if we require one. */ 2700 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2701 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2702 goto f_err; 2703 } 2704 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2705 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2706 goto f_err; 2707 } 2708 if ((alg_k & SSL_kDHE) && 2709 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2710 SSLerror(s, SSL_R_MISSING_DH_KEY); 2711 goto f_err; 2712 } 2713 2714 return (1); 2715 f_err: 2716 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2717 err: 2718 return (0); 2719 } 2720 2721 /* 2722 * Check to see if handshake is full or resumed. Usually this is just a 2723 * case of checking to see if a cache hit has occurred. In the case of 2724 * session tickets we have to check the next message to be sure. 2725 */ 2726 2727 int 2728 ssl3_check_finished(SSL *s) 2729 { 2730 int ok; 2731 long n; 2732 2733 /* If we have no ticket it cannot be a resumed session. */ 2734 if (!s->session->tlsext_tick) 2735 return (1); 2736 /* this function is called when we really expect a Certificate 2737 * message, so permit appropriate message length */ 2738 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2739 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2740 if (!ok) 2741 return ((int)n); 2742 2743 S3I(s)->tmp.reuse_message = 1; 2744 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2745 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2746 return (2); 2747 2748 return (1); 2749 } 2750 2751 int 2752 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2753 { 2754 int i = 0; 2755 2756 #ifndef OPENSSL_NO_ENGINE 2757 if (s->ctx->internal->client_cert_engine) { 2758 i = ENGINE_load_ssl_client_cert( 2759 s->ctx->internal->client_cert_engine, s, 2760 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2761 if (i != 0) 2762 return (i); 2763 } 2764 #endif 2765 if (s->ctx->internal->client_cert_cb) 2766 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2767 return (i); 2768 } 2769