1 /* $OpenBSD: ssl_clnt.c,v 1.69 2020/06/05 17:53:26 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 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_downgrade_max_version(s, &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) > SSL3_SESSION_ID_SIZE) { 907 al = SSL_AD_ILLEGAL_PARAMETER; 908 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 909 goto f_err; 910 } 911 912 /* Cipher suite. */ 913 if (!CBS_get_u16(&cbs, &cipher_suite)) 914 goto truncated; 915 916 /* 917 * Check if we want to resume the session based on external 918 * pre-shared secret. 919 */ 920 if (s->internal->tls_session_secret_cb) { 921 SSL_CIPHER *pref_cipher = NULL; 922 s->session->master_key_length = sizeof(s->session->master_key); 923 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 924 &s->session->master_key_length, NULL, &pref_cipher, 925 s->internal->tls_session_secret_cb_arg)) { 926 s->session->cipher = pref_cipher ? pref_cipher : 927 ssl3_get_cipher_by_value(cipher_suite); 928 s->s3->flags |= SSL3_FLAGS_CCS_OK; 929 } 930 } 931 932 if (s->session->session_id_length != 0 && 933 CBS_mem_equal(&session_id, s->session->session_id, 934 s->session->session_id_length)) { 935 if (s->sid_ctx_length != s->session->sid_ctx_length || 936 timingsafe_memcmp(s->session->sid_ctx, 937 s->sid_ctx, s->sid_ctx_length) != 0) { 938 /* actually a client application bug */ 939 al = SSL_AD_ILLEGAL_PARAMETER; 940 SSLerror(s, SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT); 941 goto f_err; 942 } 943 s->s3->flags |= SSL3_FLAGS_CCS_OK; 944 s->internal->hit = 1; 945 } else { 946 /* a miss or crap from the other end */ 947 948 /* If we were trying for session-id reuse, make a new 949 * SSL_SESSION so we don't stuff up other people */ 950 s->internal->hit = 0; 951 if (s->session->session_id_length > 0) { 952 if (!ssl_get_new_session(s, 0)) { 953 al = SSL_AD_INTERNAL_ERROR; 954 goto f_err; 955 } 956 } 957 958 /* 959 * XXX - improve the handling for the case where there is a 960 * zero length session identifier. 961 */ 962 if (!CBS_write_bytes(&session_id, s->session->session_id, 963 sizeof(s->session->session_id), &outlen)) 964 goto err; 965 s->session->session_id_length = outlen; 966 967 s->session->ssl_version = s->version; 968 } 969 970 if ((cipher = ssl3_get_cipher_by_value(cipher_suite)) == NULL) { 971 al = SSL_AD_ILLEGAL_PARAMETER; 972 SSLerror(s, SSL_R_UNKNOWN_CIPHER_RETURNED); 973 goto f_err; 974 } 975 976 /* TLS v1.2 only ciphersuites require v1.2 or later. */ 977 if ((cipher->algorithm_ssl & SSL_TLSV1_2) && 978 (TLS1_get_version(s) < TLS1_2_VERSION)) { 979 al = SSL_AD_ILLEGAL_PARAMETER; 980 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 981 goto f_err; 982 } 983 984 sk = ssl_get_ciphers_by_id(s); 985 i = sk_SSL_CIPHER_find(sk, cipher); 986 if (i < 0) { 987 /* we did not say we would use this cipher */ 988 al = SSL_AD_ILLEGAL_PARAMETER; 989 SSLerror(s, SSL_R_WRONG_CIPHER_RETURNED); 990 goto f_err; 991 } 992 993 /* 994 * Depending on the session caching (internal/external), the cipher 995 * and/or cipher_id values may not be set. Make sure that 996 * cipher_id is set and use it for comparison. 997 */ 998 if (s->session->cipher) 999 s->session->cipher_id = s->session->cipher->id; 1000 if (s->internal->hit && (s->session->cipher_id != cipher->id)) { 1001 al = SSL_AD_ILLEGAL_PARAMETER; 1002 SSLerror(s, SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED); 1003 goto f_err; 1004 } 1005 S3I(s)->hs.new_cipher = cipher; 1006 1007 if (!tls1_transcript_hash_init(s)) 1008 goto err; 1009 1010 /* 1011 * Don't digest cached records if no sigalgs: we may need them for 1012 * client authentication. 1013 */ 1014 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1015 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST))) 1016 tls1_transcript_free(s); 1017 1018 if (!CBS_get_u8(&cbs, &compression_method)) 1019 goto truncated; 1020 1021 if (compression_method != 0) { 1022 al = SSL_AD_ILLEGAL_PARAMETER; 1023 SSLerror(s, SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM); 1024 goto f_err; 1025 } 1026 1027 if (!tlsext_client_parse(s, &cbs, &al, SSL_TLSEXT_MSG_SH)) { 1028 SSLerror(s, SSL_R_PARSE_TLSEXT); 1029 goto f_err; 1030 } 1031 1032 /* 1033 * Determine if we need to see RI. Strictly speaking if we want to 1034 * avoid an attack we should *always* see RI even on initial server 1035 * hello because the client doesn't see any renegotiation during an 1036 * attack. However this would mean we could not connect to any server 1037 * which doesn't support RI so for the immediate future tolerate RI 1038 * absence on initial connect only. 1039 */ 1040 if (!S3I(s)->renegotiate_seen && 1041 !(s->internal->options & SSL_OP_LEGACY_SERVER_CONNECT)) { 1042 al = SSL_AD_HANDSHAKE_FAILURE; 1043 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1044 goto f_err; 1045 } 1046 1047 if (ssl_check_serverhello_tlsext(s) <= 0) { 1048 SSLerror(s, SSL_R_SERVERHELLO_TLSEXT); 1049 goto err; 1050 } 1051 1052 return (1); 1053 1054 truncated: 1055 /* wrong packet length */ 1056 al = SSL_AD_DECODE_ERROR; 1057 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1058 f_err: 1059 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1060 err: 1061 return (-1); 1062 } 1063 1064 int 1065 ssl3_get_server_certificate(SSL *s) 1066 { 1067 int al, i, ok, ret = -1; 1068 long n; 1069 CBS cbs, cert_list; 1070 X509 *x = NULL; 1071 const unsigned char *q; 1072 STACK_OF(X509) *sk = NULL; 1073 SESS_CERT *sc; 1074 EVP_PKEY *pkey = NULL; 1075 1076 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 1077 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 1078 if (!ok) 1079 return ((int)n); 1080 1081 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) { 1082 S3I(s)->tmp.reuse_message = 1; 1083 return (1); 1084 } 1085 1086 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 1087 al = SSL_AD_UNEXPECTED_MESSAGE; 1088 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1089 goto f_err; 1090 } 1091 1092 1093 if ((sk = sk_X509_new_null()) == NULL) { 1094 SSLerror(s, ERR_R_MALLOC_FAILURE); 1095 goto err; 1096 } 1097 1098 if (n < 0) 1099 goto truncated; 1100 1101 CBS_init(&cbs, s->internal->init_msg, n); 1102 if (CBS_len(&cbs) < 3) 1103 goto truncated; 1104 1105 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list) || 1106 CBS_len(&cbs) != 0) { 1107 al = SSL_AD_DECODE_ERROR; 1108 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1109 goto f_err; 1110 } 1111 1112 while (CBS_len(&cert_list) > 0) { 1113 CBS cert; 1114 1115 if (CBS_len(&cert_list) < 3) 1116 goto truncated; 1117 if (!CBS_get_u24_length_prefixed(&cert_list, &cert)) { 1118 al = SSL_AD_DECODE_ERROR; 1119 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1120 goto f_err; 1121 } 1122 1123 q = CBS_data(&cert); 1124 x = d2i_X509(NULL, &q, CBS_len(&cert)); 1125 if (x == NULL) { 1126 al = SSL_AD_BAD_CERTIFICATE; 1127 SSLerror(s, ERR_R_ASN1_LIB); 1128 goto f_err; 1129 } 1130 if (q != CBS_data(&cert) + CBS_len(&cert)) { 1131 al = SSL_AD_DECODE_ERROR; 1132 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 1133 goto f_err; 1134 } 1135 if (!sk_X509_push(sk, x)) { 1136 SSLerror(s, ERR_R_MALLOC_FAILURE); 1137 goto err; 1138 } 1139 x = NULL; 1140 } 1141 1142 i = ssl_verify_cert_chain(s, sk); 1143 if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)) { 1144 al = ssl_verify_alarm_type(s->verify_result); 1145 SSLerror(s, SSL_R_CERTIFICATE_VERIFY_FAILED); 1146 goto f_err; 1147 1148 } 1149 ERR_clear_error(); /* but we keep s->verify_result */ 1150 1151 sc = ssl_sess_cert_new(); 1152 if (sc == NULL) 1153 goto err; 1154 ssl_sess_cert_free(SSI(s)->sess_cert); 1155 SSI(s)->sess_cert = sc; 1156 1157 sc->cert_chain = sk; 1158 /* 1159 * Inconsistency alert: cert_chain does include the peer's 1160 * certificate, which we don't include in s3_srvr.c 1161 */ 1162 x = sk_X509_value(sk, 0); 1163 sk = NULL; 1164 /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/ 1165 1166 pkey = X509_get_pubkey(x); 1167 1168 if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) { 1169 x = NULL; 1170 al = SSL3_AL_FATAL; 1171 SSLerror(s, SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS); 1172 goto f_err; 1173 } 1174 1175 i = ssl_cert_type(x, pkey); 1176 if (i < 0) { 1177 x = NULL; 1178 al = SSL3_AL_FATAL; 1179 SSLerror(s, SSL_R_UNKNOWN_CERTIFICATE_TYPE); 1180 goto f_err; 1181 } 1182 1183 sc->peer_cert_type = i; 1184 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1185 /* 1186 * Why would the following ever happen? 1187 * We just created sc a couple of lines ago. 1188 */ 1189 X509_free(sc->peer_pkeys[i].x509); 1190 sc->peer_pkeys[i].x509 = x; 1191 sc->peer_key = &(sc->peer_pkeys[i]); 1192 1193 X509_free(s->session->peer); 1194 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509); 1195 s->session->peer = x; 1196 s->session->verify_result = s->verify_result; 1197 1198 x = NULL; 1199 ret = 1; 1200 1201 if (0) { 1202 truncated: 1203 /* wrong packet length */ 1204 al = SSL_AD_DECODE_ERROR; 1205 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1206 f_err: 1207 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1208 } 1209 err: 1210 EVP_PKEY_free(pkey); 1211 X509_free(x); 1212 sk_X509_pop_free(sk, X509_free); 1213 1214 return (ret); 1215 } 1216 1217 static int 1218 ssl3_get_server_kex_dhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1219 { 1220 CBS dhp, dhg, dhpk; 1221 BN_CTX *bn_ctx = NULL; 1222 SESS_CERT *sc = NULL; 1223 DH *dh = NULL; 1224 long alg_a; 1225 int al; 1226 1227 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1228 sc = SSI(s)->sess_cert; 1229 1230 if ((dh = DH_new()) == NULL) { 1231 SSLerror(s, ERR_R_DH_LIB); 1232 goto err; 1233 } 1234 1235 if (!CBS_get_u16_length_prefixed(cbs, &dhp)) 1236 goto truncated; 1237 if ((dh->p = BN_bin2bn(CBS_data(&dhp), CBS_len(&dhp), NULL)) == NULL) { 1238 SSLerror(s, ERR_R_BN_LIB); 1239 goto err; 1240 } 1241 1242 if (!CBS_get_u16_length_prefixed(cbs, &dhg)) 1243 goto truncated; 1244 if ((dh->g = BN_bin2bn(CBS_data(&dhg), CBS_len(&dhg), NULL)) == NULL) { 1245 SSLerror(s, ERR_R_BN_LIB); 1246 goto err; 1247 } 1248 1249 if (!CBS_get_u16_length_prefixed(cbs, &dhpk)) 1250 goto truncated; 1251 if ((dh->pub_key = BN_bin2bn(CBS_data(&dhpk), CBS_len(&dhpk), 1252 NULL)) == NULL) { 1253 SSLerror(s, ERR_R_BN_LIB); 1254 goto err; 1255 } 1256 1257 /* 1258 * Check the strength of the DH key just constructed. 1259 * Discard keys weaker than 1024 bits. 1260 */ 1261 if (DH_size(dh) < 1024 / 8) { 1262 SSLerror(s, SSL_R_BAD_DH_P_LENGTH); 1263 goto err; 1264 } 1265 1266 if (alg_a & SSL_aRSA) 1267 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1268 else 1269 /* XXX - Anonymous DH, so no certificate or pkey. */ 1270 *pkey = NULL; 1271 1272 sc->peer_dh_tmp = dh; 1273 1274 return (1); 1275 1276 truncated: 1277 al = SSL_AD_DECODE_ERROR; 1278 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1279 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1280 1281 err: 1282 DH_free(dh); 1283 BN_CTX_free(bn_ctx); 1284 1285 return (-1); 1286 } 1287 1288 static int 1289 ssl3_get_server_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1290 { 1291 EC_KEY *ecdh = NULL; 1292 int ret = -1; 1293 1294 /* Extract the server's ephemeral ECDH public key. */ 1295 if ((ecdh = EC_KEY_new()) == NULL) { 1296 SSLerror(s, ERR_R_MALLOC_FAILURE); 1297 goto err; 1298 } 1299 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh, nid, public)) { 1300 SSLerror(s, SSL_R_BAD_ECPOINT); 1301 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1302 goto err; 1303 } 1304 1305 sc->peer_nid = nid; 1306 sc->peer_ecdh_tmp = ecdh; 1307 ecdh = NULL; 1308 1309 ret = 1; 1310 1311 err: 1312 EC_KEY_free(ecdh); 1313 1314 return (ret); 1315 } 1316 1317 static int 1318 ssl3_get_server_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, int nid, CBS *public) 1319 { 1320 size_t outlen; 1321 1322 if (nid != NID_X25519) { 1323 SSLerror(s, ERR_R_INTERNAL_ERROR); 1324 goto err; 1325 } 1326 1327 if (CBS_len(public) != X25519_KEY_LENGTH) { 1328 SSLerror(s, SSL_R_BAD_ECPOINT); 1329 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1330 goto err; 1331 } 1332 1333 if (!CBS_stow(public, &sc->peer_x25519_tmp, &outlen)) { 1334 SSLerror(s, ERR_R_MALLOC_FAILURE); 1335 goto err; 1336 } 1337 1338 return (1); 1339 1340 err: 1341 return (-1); 1342 } 1343 1344 static int 1345 ssl3_get_server_kex_ecdhe(SSL *s, EVP_PKEY **pkey, CBS *cbs) 1346 { 1347 CBS public; 1348 uint8_t curve_type; 1349 uint16_t curve_id; 1350 SESS_CERT *sc; 1351 long alg_a; 1352 int nid; 1353 int al; 1354 1355 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1356 sc = SSI(s)->sess_cert; 1357 1358 /* Only named curves are supported. */ 1359 if (!CBS_get_u8(cbs, &curve_type) || 1360 curve_type != NAMED_CURVE_TYPE || 1361 !CBS_get_u16(cbs, &curve_id)) { 1362 al = SSL_AD_DECODE_ERROR; 1363 SSLerror(s, SSL_R_LENGTH_TOO_SHORT); 1364 goto f_err; 1365 } 1366 1367 /* 1368 * Check that the curve is one of our preferences - if it is not, 1369 * the server has sent us an invalid curve. 1370 */ 1371 if (tls1_check_curve(s, curve_id) != 1) { 1372 al = SSL_AD_DECODE_ERROR; 1373 SSLerror(s, SSL_R_WRONG_CURVE); 1374 goto f_err; 1375 } 1376 1377 if ((nid = tls1_ec_curve_id2nid(curve_id)) == 0) { 1378 al = SSL_AD_INTERNAL_ERROR; 1379 SSLerror(s, SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS); 1380 goto f_err; 1381 } 1382 1383 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1384 goto truncated; 1385 1386 if (nid == NID_X25519) { 1387 if (ssl3_get_server_kex_ecdhe_ecx(s, sc, nid, &public) != 1) 1388 goto err; 1389 } else { 1390 if (ssl3_get_server_kex_ecdhe_ecp(s, sc, nid, &public) != 1) 1391 goto err; 1392 } 1393 1394 /* 1395 * The ECC/TLS specification does not mention the use of DSA to sign 1396 * ECParameters in the server key exchange message. We do support RSA 1397 * and ECDSA. 1398 */ 1399 if (alg_a & SSL_aRSA) 1400 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_RSA].x509); 1401 else if (alg_a & SSL_aECDSA) 1402 *pkey = X509_get_pubkey(sc->peer_pkeys[SSL_PKEY_ECC].x509); 1403 else 1404 /* XXX - Anonymous ECDH, so no certificate or pkey. */ 1405 *pkey = NULL; 1406 1407 return (1); 1408 1409 truncated: 1410 al = SSL_AD_DECODE_ERROR; 1411 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1412 1413 f_err: 1414 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1415 1416 err: 1417 return (-1); 1418 } 1419 1420 int 1421 ssl3_get_server_key_exchange(SSL *s) 1422 { 1423 CBS cbs, signature; 1424 const EVP_MD *md = NULL; 1425 EVP_PKEY *pkey = NULL; 1426 EVP_MD_CTX md_ctx; 1427 const unsigned char *param; 1428 long n, alg_k, alg_a; 1429 int al, ok; 1430 size_t param_len; 1431 1432 EVP_MD_CTX_init(&md_ctx); 1433 1434 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1435 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1436 1437 /* 1438 * Use same message size as in ssl3_get_certificate_request() 1439 * as ServerKeyExchange message may be skipped. 1440 */ 1441 n = ssl3_get_message(s, SSL3_ST_CR_KEY_EXCH_A, 1442 SSL3_ST_CR_KEY_EXCH_B, -1, s->internal->max_cert_list, &ok); 1443 if (!ok) 1444 return ((int)n); 1445 1446 if (n < 0) 1447 goto err; 1448 1449 CBS_init(&cbs, s->internal->init_msg, n); 1450 1451 if (S3I(s)->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE) { 1452 /* 1453 * Do not skip server key exchange if this cipher suite uses 1454 * ephemeral keys. 1455 */ 1456 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 1457 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1458 al = SSL_AD_UNEXPECTED_MESSAGE; 1459 goto f_err; 1460 } 1461 1462 S3I(s)->tmp.reuse_message = 1; 1463 EVP_MD_CTX_cleanup(&md_ctx); 1464 return (1); 1465 } 1466 1467 if (SSI(s)->sess_cert != NULL) { 1468 DH_free(SSI(s)->sess_cert->peer_dh_tmp); 1469 SSI(s)->sess_cert->peer_dh_tmp = NULL; 1470 1471 EC_KEY_free(SSI(s)->sess_cert->peer_ecdh_tmp); 1472 SSI(s)->sess_cert->peer_ecdh_tmp = NULL; 1473 1474 free(SSI(s)->sess_cert->peer_x25519_tmp); 1475 SSI(s)->sess_cert->peer_x25519_tmp = NULL; 1476 } else { 1477 SSI(s)->sess_cert = ssl_sess_cert_new(); 1478 if (SSI(s)->sess_cert == NULL) 1479 goto err; 1480 } 1481 1482 param = CBS_data(&cbs); 1483 param_len = CBS_len(&cbs); 1484 1485 if (alg_k & SSL_kDHE) { 1486 if (ssl3_get_server_kex_dhe(s, &pkey, &cbs) != 1) 1487 goto err; 1488 } else if (alg_k & SSL_kECDHE) { 1489 if (ssl3_get_server_kex_ecdhe(s, &pkey, &cbs) != 1) 1490 goto err; 1491 } else if (alg_k != 0) { 1492 al = SSL_AD_UNEXPECTED_MESSAGE; 1493 SSLerror(s, SSL_R_UNEXPECTED_MESSAGE); 1494 goto f_err; 1495 } 1496 1497 param_len -= CBS_len(&cbs); 1498 1499 /* if it was signed, check the signature */ 1500 if (pkey != NULL) { 1501 EVP_PKEY_CTX *pctx; 1502 const struct ssl_sigalg *sigalg; 1503 1504 if (SSL_USE_SIGALGS(s)) { 1505 uint16_t sigalg_value; 1506 1507 if (!CBS_get_u16(&cbs, &sigalg_value)) 1508 goto truncated; 1509 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 1510 tls12_sigalgs_len)) == NULL) { 1511 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1512 al = SSL_AD_DECODE_ERROR; 1513 goto f_err; 1514 } 1515 if ((md = sigalg->md()) == NULL) { 1516 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 1517 al = SSL_AD_DECODE_ERROR; 1518 goto f_err; 1519 } 1520 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 1521 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 1522 al = SSL_AD_DECODE_ERROR; 1523 goto f_err; 1524 } 1525 } else if (pkey->type == EVP_PKEY_RSA) { 1526 sigalg = ssl_sigalg_lookup(SIGALG_RSA_PKCS1_MD5_SHA1); 1527 } else if (pkey->type == EVP_PKEY_EC) { 1528 sigalg = ssl_sigalg_lookup(SIGALG_ECDSA_SHA1); 1529 } else { 1530 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1531 al = SSL_AD_DECODE_ERROR; 1532 goto f_err; 1533 } 1534 md = sigalg->md(); 1535 1536 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1537 goto truncated; 1538 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1539 al = SSL_AD_DECODE_ERROR; 1540 SSLerror(s, SSL_R_WRONG_SIGNATURE_LENGTH); 1541 goto f_err; 1542 } 1543 1544 if (!EVP_DigestVerifyInit(&md_ctx, &pctx, md, NULL, pkey)) 1545 goto err; 1546 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->client_random, 1547 SSL3_RANDOM_SIZE)) 1548 goto err; 1549 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1550 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1551 RSA_PKCS1_PSS_PADDING) || 1552 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) 1553 goto err; 1554 if (!EVP_DigestVerifyUpdate(&md_ctx, s->s3->server_random, 1555 SSL3_RANDOM_SIZE)) 1556 goto err; 1557 if (!EVP_DigestVerifyUpdate(&md_ctx, param, param_len)) 1558 goto err; 1559 if (EVP_DigestVerifyFinal(&md_ctx, CBS_data(&signature), 1560 CBS_len(&signature)) <= 0) { 1561 al = SSL_AD_DECRYPT_ERROR; 1562 SSLerror(s, SSL_R_BAD_SIGNATURE); 1563 goto f_err; 1564 } 1565 } else { 1566 /* aNULL does not need public keys. */ 1567 if (!(alg_a & SSL_aNULL)) { 1568 SSLerror(s, ERR_R_INTERNAL_ERROR); 1569 goto err; 1570 } 1571 } 1572 1573 if (CBS_len(&cbs) != 0) { 1574 al = SSL_AD_DECODE_ERROR; 1575 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1576 goto f_err; 1577 } 1578 1579 EVP_PKEY_free(pkey); 1580 EVP_MD_CTX_cleanup(&md_ctx); 1581 1582 return (1); 1583 1584 truncated: 1585 al = SSL_AD_DECODE_ERROR; 1586 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1587 1588 f_err: 1589 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1590 1591 err: 1592 EVP_PKEY_free(pkey); 1593 EVP_MD_CTX_cleanup(&md_ctx); 1594 1595 return (-1); 1596 } 1597 1598 int 1599 ssl3_get_certificate_request(SSL *s) 1600 { 1601 int ok, ret = 0; 1602 long n; 1603 uint8_t ctype_num; 1604 CBS cert_request, ctypes, rdn_list; 1605 X509_NAME *xn = NULL; 1606 const unsigned char *q; 1607 STACK_OF(X509_NAME) *ca_sk = NULL; 1608 1609 n = ssl3_get_message(s, SSL3_ST_CR_CERT_REQ_A, 1610 SSL3_ST_CR_CERT_REQ_B, -1, s->internal->max_cert_list, &ok); 1611 if (!ok) 1612 return ((int)n); 1613 1614 S3I(s)->tmp.cert_req = 0; 1615 1616 if (S3I(s)->tmp.message_type == SSL3_MT_SERVER_DONE) { 1617 S3I(s)->tmp.reuse_message = 1; 1618 /* 1619 * If we get here we don't need any cached handshake records 1620 * as we wont be doing client auth. 1621 */ 1622 tls1_transcript_free(s); 1623 return (1); 1624 } 1625 1626 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST) { 1627 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1628 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 1629 goto err; 1630 } 1631 1632 /* TLS does not like anon-DH with client cert */ 1633 if (S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL) { 1634 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE); 1635 SSLerror(s, SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER); 1636 goto err; 1637 } 1638 1639 if (n < 0) 1640 goto truncated; 1641 CBS_init(&cert_request, s->internal->init_msg, n); 1642 1643 if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) { 1644 SSLerror(s, ERR_R_MALLOC_FAILURE); 1645 goto err; 1646 } 1647 1648 /* get the certificate types */ 1649 if (!CBS_get_u8(&cert_request, &ctype_num)) 1650 goto truncated; 1651 1652 if (ctype_num > SSL3_CT_NUMBER) 1653 ctype_num = SSL3_CT_NUMBER; 1654 if (!CBS_get_bytes(&cert_request, &ctypes, ctype_num) || 1655 !CBS_write_bytes(&ctypes, (uint8_t *)S3I(s)->tmp.ctype, 1656 sizeof(S3I(s)->tmp.ctype), NULL)) { 1657 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1658 goto err; 1659 } 1660 1661 if (SSL_USE_SIGALGS(s)) { 1662 CBS sigalgs; 1663 1664 if (CBS_len(&cert_request) < 2) { 1665 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1666 goto err; 1667 } 1668 if (!CBS_get_u16_length_prefixed(&cert_request, &sigalgs)) { 1669 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1670 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1671 goto err; 1672 } 1673 if (CBS_len(&sigalgs) % 2 != 0 || CBS_len(&sigalgs) > 64) { 1674 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1675 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 1676 goto err; 1677 } 1678 if (!CBS_stow(&sigalgs, &S3I(s)->hs.sigalgs, 1679 &S3I(s)->hs.sigalgs_len)) 1680 goto err; 1681 } 1682 1683 /* get the CA RDNs */ 1684 if (CBS_len(&cert_request) < 2) { 1685 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1686 goto err; 1687 } 1688 1689 if (!CBS_get_u16_length_prefixed(&cert_request, &rdn_list) || 1690 CBS_len(&cert_request) != 0) { 1691 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1692 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1693 goto err; 1694 } 1695 1696 while (CBS_len(&rdn_list) > 0) { 1697 CBS rdn; 1698 1699 if (CBS_len(&rdn_list) < 2) { 1700 SSLerror(s, SSL_R_DATA_LENGTH_TOO_LONG); 1701 goto err; 1702 } 1703 1704 if (!CBS_get_u16_length_prefixed(&rdn_list, &rdn)) { 1705 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1706 SSLerror(s, SSL_R_CA_DN_TOO_LONG); 1707 goto err; 1708 } 1709 1710 q = CBS_data(&rdn); 1711 if ((xn = d2i_X509_NAME(NULL, &q, CBS_len(&rdn))) == NULL) { 1712 ssl3_send_alert(s, SSL3_AL_FATAL, 1713 SSL_AD_DECODE_ERROR); 1714 SSLerror(s, ERR_R_ASN1_LIB); 1715 goto err; 1716 } 1717 1718 if (q != CBS_data(&rdn) + CBS_len(&rdn)) { 1719 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1720 SSLerror(s, SSL_R_CA_DN_LENGTH_MISMATCH); 1721 goto err; 1722 } 1723 if (!sk_X509_NAME_push(ca_sk, xn)) { 1724 SSLerror(s, ERR_R_MALLOC_FAILURE); 1725 goto err; 1726 } 1727 xn = NULL; /* avoid free in err block */ 1728 } 1729 1730 /* we should setup a certificate to return.... */ 1731 S3I(s)->tmp.cert_req = 1; 1732 S3I(s)->tmp.ctype_num = ctype_num; 1733 sk_X509_NAME_pop_free(S3I(s)->tmp.ca_names, X509_NAME_free); 1734 S3I(s)->tmp.ca_names = ca_sk; 1735 ca_sk = NULL; 1736 1737 ret = 1; 1738 if (0) { 1739 truncated: 1740 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1741 } 1742 err: 1743 X509_NAME_free(xn); 1744 sk_X509_NAME_pop_free(ca_sk, X509_NAME_free); 1745 return (ret); 1746 } 1747 1748 static int 1749 ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b) 1750 { 1751 return (X509_NAME_cmp(*a, *b)); 1752 } 1753 1754 int 1755 ssl3_get_new_session_ticket(SSL *s) 1756 { 1757 int ok, al, ret = 0; 1758 uint32_t lifetime_hint; 1759 long n; 1760 CBS cbs, session_ticket; 1761 1762 n = ssl3_get_message(s, SSL3_ST_CR_SESSION_TICKET_A, 1763 SSL3_ST_CR_SESSION_TICKET_B, -1, 16384, &ok); 1764 if (!ok) 1765 return ((int)n); 1766 1767 if (S3I(s)->tmp.message_type == SSL3_MT_FINISHED) { 1768 S3I(s)->tmp.reuse_message = 1; 1769 return (1); 1770 } 1771 if (S3I(s)->tmp.message_type != SSL3_MT_NEWSESSION_TICKET) { 1772 al = SSL_AD_UNEXPECTED_MESSAGE; 1773 SSLerror(s, SSL_R_BAD_MESSAGE_TYPE); 1774 goto f_err; 1775 } 1776 1777 if (n < 0) { 1778 al = SSL_AD_DECODE_ERROR; 1779 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1780 goto f_err; 1781 } 1782 1783 CBS_init(&cbs, s->internal->init_msg, n); 1784 if (!CBS_get_u32(&cbs, &lifetime_hint) || 1785 #if UINT32_MAX > LONG_MAX 1786 lifetime_hint > LONG_MAX || 1787 #endif 1788 !CBS_get_u16_length_prefixed(&cbs, &session_ticket) || 1789 CBS_len(&cbs) != 0) { 1790 al = SSL_AD_DECODE_ERROR; 1791 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1792 goto f_err; 1793 } 1794 s->session->tlsext_tick_lifetime_hint = (long)lifetime_hint; 1795 1796 if (!CBS_stow(&session_ticket, &s->session->tlsext_tick, 1797 &s->session->tlsext_ticklen)) { 1798 SSLerror(s, ERR_R_MALLOC_FAILURE); 1799 goto err; 1800 } 1801 1802 /* 1803 * There are two ways to detect a resumed ticket sesion. 1804 * One is to set an appropriate session ID and then the server 1805 * must return a match in ServerHello. This allows the normal 1806 * client session ID matching to work and we know much 1807 * earlier that the ticket has been accepted. 1808 * 1809 * The other way is to set zero length session ID when the 1810 * ticket is presented and rely on the handshake to determine 1811 * session resumption. 1812 * 1813 * We choose the former approach because this fits in with 1814 * assumptions elsewhere in OpenSSL. The session ID is set 1815 * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the 1816 * ticket. 1817 */ 1818 EVP_Digest(CBS_data(&session_ticket), CBS_len(&session_ticket), 1819 s->session->session_id, &s->session->session_id_length, 1820 EVP_sha256(), NULL); 1821 ret = 1; 1822 return (ret); 1823 f_err: 1824 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1825 err: 1826 return (-1); 1827 } 1828 1829 int 1830 ssl3_get_cert_status(SSL *s) 1831 { 1832 CBS cert_status, response; 1833 int ok, al; 1834 long n; 1835 uint8_t status_type; 1836 1837 n = ssl3_get_message(s, SSL3_ST_CR_CERT_STATUS_A, 1838 SSL3_ST_CR_CERT_STATUS_B, SSL3_MT_CERTIFICATE_STATUS, 1839 16384, &ok); 1840 if (!ok) 1841 return ((int)n); 1842 1843 if (n < 0) { 1844 /* need at least status type + length */ 1845 al = SSL_AD_DECODE_ERROR; 1846 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1847 goto f_err; 1848 } 1849 1850 CBS_init(&cert_status, s->internal->init_msg, n); 1851 if (!CBS_get_u8(&cert_status, &status_type) || 1852 CBS_len(&cert_status) < 3) { 1853 /* need at least status type + length */ 1854 al = SSL_AD_DECODE_ERROR; 1855 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1856 goto f_err; 1857 } 1858 1859 if (status_type != TLSEXT_STATUSTYPE_ocsp) { 1860 al = SSL_AD_DECODE_ERROR; 1861 SSLerror(s, SSL_R_UNSUPPORTED_STATUS_TYPE); 1862 goto f_err; 1863 } 1864 1865 if (!CBS_get_u24_length_prefixed(&cert_status, &response) || 1866 CBS_len(&cert_status) != 0) { 1867 al = SSL_AD_DECODE_ERROR; 1868 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1869 goto f_err; 1870 } 1871 1872 if (!CBS_stow(&response, &s->internal->tlsext_ocsp_resp, 1873 &s->internal->tlsext_ocsp_resp_len)) { 1874 al = SSL_AD_INTERNAL_ERROR; 1875 SSLerror(s, ERR_R_MALLOC_FAILURE); 1876 goto f_err; 1877 } 1878 1879 if (s->ctx->internal->tlsext_status_cb) { 1880 int ret; 1881 ret = s->ctx->internal->tlsext_status_cb(s, 1882 s->ctx->internal->tlsext_status_arg); 1883 if (ret == 0) { 1884 al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE; 1885 SSLerror(s, SSL_R_INVALID_STATUS_RESPONSE); 1886 goto f_err; 1887 } 1888 if (ret < 0) { 1889 al = SSL_AD_INTERNAL_ERROR; 1890 SSLerror(s, ERR_R_MALLOC_FAILURE); 1891 goto f_err; 1892 } 1893 } 1894 return (1); 1895 f_err: 1896 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1897 return (-1); 1898 } 1899 1900 int 1901 ssl3_get_server_done(SSL *s) 1902 { 1903 int ok, ret = 0; 1904 long n; 1905 1906 n = ssl3_get_message(s, SSL3_ST_CR_SRVR_DONE_A, 1907 SSL3_ST_CR_SRVR_DONE_B, SSL3_MT_SERVER_DONE, 1908 30, /* should be very small, like 0 :-) */ &ok); 1909 if (!ok) 1910 return ((int)n); 1911 1912 if (n > 0) { 1913 /* should contain no data */ 1914 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1915 SSLerror(s, SSL_R_LENGTH_MISMATCH); 1916 return (-1); 1917 } 1918 ret = 1; 1919 return (ret); 1920 } 1921 1922 static int 1923 ssl3_send_client_kex_rsa(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1924 { 1925 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH]; 1926 unsigned char *enc_pms = NULL; 1927 EVP_PKEY *pkey = NULL; 1928 int ret = -1; 1929 int enc_len; 1930 CBB epms; 1931 1932 /* 1933 * RSA-Encrypted Premaster Secret Message - RFC 5246 section 7.4.7.1. 1934 */ 1935 1936 pkey = X509_get_pubkey(sess_cert->peer_pkeys[SSL_PKEY_RSA].x509); 1937 if (pkey == NULL || pkey->type != EVP_PKEY_RSA || 1938 pkey->pkey.rsa == NULL) { 1939 SSLerror(s, ERR_R_INTERNAL_ERROR); 1940 goto err; 1941 } 1942 1943 pms[0] = s->client_version >> 8; 1944 pms[1] = s->client_version & 0xff; 1945 arc4random_buf(&pms[2], sizeof(pms) - 2); 1946 1947 if ((enc_pms = malloc(RSA_size(pkey->pkey.rsa))) == NULL) { 1948 SSLerror(s, ERR_R_MALLOC_FAILURE); 1949 goto err; 1950 } 1951 1952 enc_len = RSA_public_encrypt(sizeof(pms), pms, enc_pms, pkey->pkey.rsa, 1953 RSA_PKCS1_PADDING); 1954 if (enc_len <= 0) { 1955 SSLerror(s, SSL_R_BAD_RSA_ENCRYPT); 1956 goto err; 1957 } 1958 1959 if (!CBB_add_u16_length_prefixed(cbb, &epms)) 1960 goto err; 1961 if (!CBB_add_bytes(&epms, enc_pms, enc_len)) 1962 goto err; 1963 if (!CBB_flush(cbb)) 1964 goto err; 1965 1966 s->session->master_key_length = 1967 tls1_generate_master_secret(s, 1968 s->session->master_key, pms, sizeof(pms)); 1969 1970 ret = 1; 1971 1972 err: 1973 explicit_bzero(pms, sizeof(pms)); 1974 EVP_PKEY_free(pkey); 1975 free(enc_pms); 1976 1977 return (ret); 1978 } 1979 1980 static int 1981 ssl3_send_client_kex_dhe(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 1982 { 1983 DH *dh_srvr = NULL, *dh_clnt = NULL; 1984 unsigned char *key = NULL; 1985 int key_size = 0, key_len; 1986 unsigned char *data; 1987 int ret = -1; 1988 CBB dh_Yc; 1989 1990 /* Ensure that we have an ephemeral key for DHE. */ 1991 if (sess_cert->peer_dh_tmp == NULL) { 1992 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1993 SSLerror(s, SSL_R_UNABLE_TO_FIND_DH_PARAMETERS); 1994 goto err; 1995 } 1996 dh_srvr = sess_cert->peer_dh_tmp; 1997 1998 /* Generate a new random key. */ 1999 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) { 2000 SSLerror(s, ERR_R_DH_LIB); 2001 goto err; 2002 } 2003 if (!DH_generate_key(dh_clnt)) { 2004 SSLerror(s, ERR_R_DH_LIB); 2005 goto err; 2006 } 2007 if ((key_size = DH_size(dh_clnt)) <= 0) { 2008 SSLerror(s, ERR_R_DH_LIB); 2009 goto err; 2010 } 2011 if ((key = malloc(key_size)) == NULL) { 2012 SSLerror(s, ERR_R_MALLOC_FAILURE); 2013 goto err; 2014 } 2015 if ((key_len = DH_compute_key(key, dh_srvr->pub_key, dh_clnt)) <= 0) { 2016 SSLerror(s, ERR_R_DH_LIB); 2017 goto err; 2018 } 2019 2020 /* Generate master key from the result. */ 2021 s->session->master_key_length = 2022 tls1_generate_master_secret(s, 2023 s->session->master_key, key, key_len); 2024 2025 if (!CBB_add_u16_length_prefixed(cbb, &dh_Yc)) 2026 goto err; 2027 if (!CBB_add_space(&dh_Yc, &data, BN_num_bytes(dh_clnt->pub_key))) 2028 goto err; 2029 BN_bn2bin(dh_clnt->pub_key, data); 2030 if (!CBB_flush(cbb)) 2031 goto err; 2032 2033 ret = 1; 2034 2035 err: 2036 DH_free(dh_clnt); 2037 freezero(key, key_size); 2038 2039 return (ret); 2040 } 2041 2042 static int 2043 ssl3_send_client_kex_ecdhe_ecp(SSL *s, SESS_CERT *sc, CBB *cbb) 2044 { 2045 EC_KEY *ecdh = NULL; 2046 uint8_t *key = NULL; 2047 size_t key_len = 0; 2048 int ret = -1; 2049 CBB ecpoint; 2050 2051 if ((ecdh = EC_KEY_new()) == NULL) { 2052 SSLerror(s, ERR_R_MALLOC_FAILURE); 2053 goto err; 2054 } 2055 2056 if (!ssl_kex_generate_ecdhe_ecp(ecdh, sc->peer_nid)) 2057 goto err; 2058 2059 /* Encode our public key. */ 2060 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2061 goto err; 2062 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 2063 goto err; 2064 if (!CBB_flush(cbb)) 2065 goto err; 2066 2067 if (!ssl_kex_derive_ecdhe_ecp(ecdh, sc->peer_ecdh_tmp, &key, &key_len)) 2068 goto err; 2069 s->session->master_key_length = tls1_generate_master_secret(s, 2070 s->session->master_key, key, key_len); 2071 2072 ret = 1; 2073 2074 err: 2075 freezero(key, key_len); 2076 EC_KEY_free(ecdh); 2077 2078 return (ret); 2079 } 2080 2081 static int 2082 ssl3_send_client_kex_ecdhe_ecx(SSL *s, SESS_CERT *sc, CBB *cbb) 2083 { 2084 uint8_t *public_key = NULL, *private_key = NULL, *shared_key = NULL; 2085 int ret = -1; 2086 CBB ecpoint; 2087 2088 /* Generate X25519 key pair and derive shared key. */ 2089 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 2090 goto err; 2091 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 2092 goto err; 2093 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2094 goto err; 2095 X25519_keypair(public_key, private_key); 2096 if (!X25519(shared_key, private_key, sc->peer_x25519_tmp)) 2097 goto err; 2098 2099 /* Serialize the public key. */ 2100 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 2101 goto err; 2102 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 2103 goto err; 2104 if (!CBB_flush(cbb)) 2105 goto err; 2106 2107 /* Generate master key from the result. */ 2108 s->session->master_key_length = 2109 tls1_generate_master_secret(s, 2110 s->session->master_key, shared_key, X25519_KEY_LENGTH); 2111 2112 ret = 1; 2113 2114 err: 2115 free(public_key); 2116 freezero(private_key, X25519_KEY_LENGTH); 2117 freezero(shared_key, X25519_KEY_LENGTH); 2118 2119 return (ret); 2120 } 2121 2122 static int 2123 ssl3_send_client_kex_ecdhe(SSL *s, SESS_CERT *sc, CBB *cbb) 2124 { 2125 if (sc->peer_x25519_tmp != NULL) { 2126 if (ssl3_send_client_kex_ecdhe_ecx(s, sc, cbb) != 1) 2127 goto err; 2128 } else if (sc->peer_ecdh_tmp != NULL) { 2129 if (ssl3_send_client_kex_ecdhe_ecp(s, sc, cbb) != 1) 2130 goto err; 2131 } else { 2132 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2133 SSLerror(s, ERR_R_INTERNAL_ERROR); 2134 goto err; 2135 } 2136 2137 return (1); 2138 2139 err: 2140 return (-1); 2141 } 2142 2143 static int 2144 ssl3_send_client_kex_gost(SSL *s, SESS_CERT *sess_cert, CBB *cbb) 2145 { 2146 unsigned char premaster_secret[32], shared_ukm[32], tmp[256]; 2147 EVP_PKEY *pub_key = NULL; 2148 EVP_PKEY_CTX *pkey_ctx; 2149 X509 *peer_cert; 2150 size_t msglen; 2151 unsigned int md_len; 2152 EVP_MD_CTX *ukm_hash; 2153 int ret = -1; 2154 int nid; 2155 CBB gostblob; 2156 2157 /* Get server sertificate PKEY and create ctx from it */ 2158 peer_cert = sess_cert->peer_pkeys[SSL_PKEY_GOST01].x509; 2159 if (peer_cert == NULL) { 2160 SSLerror(s, SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER); 2161 goto err; 2162 } 2163 2164 pub_key = X509_get_pubkey(peer_cert); 2165 pkey_ctx = EVP_PKEY_CTX_new(pub_key, NULL); 2166 2167 /* 2168 * If we have send a certificate, and certificate key parameters match 2169 * those of server certificate, use certificate key for key exchange. 2170 * Otherwise, generate ephemeral key pair. 2171 */ 2172 EVP_PKEY_encrypt_init(pkey_ctx); 2173 2174 /* Generate session key. */ 2175 arc4random_buf(premaster_secret, 32); 2176 2177 /* 2178 * If we have client certificate, use its secret as peer key. 2179 */ 2180 if (S3I(s)->tmp.cert_req && s->cert->key->privatekey) { 2181 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2182 s->cert->key->privatekey) <=0) { 2183 /* 2184 * If there was an error - just ignore it. 2185 * Ephemeral key would be used. 2186 */ 2187 ERR_clear_error(); 2188 } 2189 } 2190 2191 /* 2192 * Compute shared IV and store it in algorithm-specific context data. 2193 */ 2194 ukm_hash = EVP_MD_CTX_new(); 2195 if (ukm_hash == NULL) { 2196 SSLerror(s, ERR_R_MALLOC_FAILURE); 2197 goto err; 2198 } 2199 2200 if (ssl_get_algorithm2(s) & SSL_HANDSHAKE_MAC_GOST94) 2201 nid = NID_id_GostR3411_94; 2202 else 2203 nid = NID_id_tc26_gost3411_2012_256; 2204 if (!EVP_DigestInit(ukm_hash, EVP_get_digestbynid(nid))) 2205 goto err; 2206 EVP_DigestUpdate(ukm_hash, s->s3->client_random, SSL3_RANDOM_SIZE); 2207 EVP_DigestUpdate(ukm_hash, s->s3->server_random, SSL3_RANDOM_SIZE); 2208 EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len); 2209 EVP_MD_CTX_free(ukm_hash); 2210 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT, 2211 EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) { 2212 SSLerror(s, SSL_R_LIBRARY_BUG); 2213 goto err; 2214 } 2215 2216 /* 2217 * Make GOST keytransport blob message, encapsulate it into sequence. 2218 */ 2219 msglen = 255; 2220 if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, premaster_secret, 2221 32) < 0) { 2222 SSLerror(s, SSL_R_LIBRARY_BUG); 2223 goto err; 2224 } 2225 2226 if (!CBB_add_asn1(cbb, &gostblob, CBS_ASN1_SEQUENCE)) 2227 goto err; 2228 if (!CBB_add_bytes(&gostblob, tmp, msglen)) 2229 goto err; 2230 if (!CBB_flush(cbb)) 2231 goto err; 2232 2233 /* Check if pubkey from client certificate was used. */ 2234 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, 2235 NULL) > 0) { 2236 /* Set flag "skip certificate verify". */ 2237 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 2238 } 2239 EVP_PKEY_CTX_free(pkey_ctx); 2240 s->session->master_key_length = 2241 tls1_generate_master_secret(s, 2242 s->session->master_key, premaster_secret, 32); 2243 2244 ret = 1; 2245 2246 err: 2247 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 2248 EVP_PKEY_free(pub_key); 2249 2250 return (ret); 2251 } 2252 2253 int 2254 ssl3_send_client_key_exchange(SSL *s) 2255 { 2256 SESS_CERT *sess_cert; 2257 unsigned long alg_k; 2258 CBB cbb, kex; 2259 2260 memset(&cbb, 0, sizeof(cbb)); 2261 2262 if (S3I(s)->hs.state == SSL3_ST_CW_KEY_EXCH_A) { 2263 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2264 2265 if ((sess_cert = SSI(s)->sess_cert) == NULL) { 2266 ssl3_send_alert(s, SSL3_AL_FATAL, 2267 SSL_AD_UNEXPECTED_MESSAGE); 2268 SSLerror(s, ERR_R_INTERNAL_ERROR); 2269 goto err; 2270 } 2271 2272 if (!ssl3_handshake_msg_start(s, &cbb, &kex, 2273 SSL3_MT_CLIENT_KEY_EXCHANGE)) 2274 goto err; 2275 2276 if (alg_k & SSL_kRSA) { 2277 if (ssl3_send_client_kex_rsa(s, sess_cert, &kex) != 1) 2278 goto err; 2279 } else if (alg_k & SSL_kDHE) { 2280 if (ssl3_send_client_kex_dhe(s, sess_cert, &kex) != 1) 2281 goto err; 2282 } else if (alg_k & SSL_kECDHE) { 2283 if (ssl3_send_client_kex_ecdhe(s, sess_cert, &kex) != 1) 2284 goto err; 2285 } else if (alg_k & SSL_kGOST) { 2286 if (ssl3_send_client_kex_gost(s, sess_cert, &kex) != 1) 2287 goto err; 2288 } else { 2289 ssl3_send_alert(s, SSL3_AL_FATAL, 2290 SSL_AD_HANDSHAKE_FAILURE); 2291 SSLerror(s, ERR_R_INTERNAL_ERROR); 2292 goto err; 2293 } 2294 2295 if (!ssl3_handshake_msg_finish(s, &cbb)) 2296 goto err; 2297 2298 S3I(s)->hs.state = SSL3_ST_CW_KEY_EXCH_B; 2299 } 2300 2301 /* SSL3_ST_CW_KEY_EXCH_B */ 2302 return (ssl3_handshake_write(s)); 2303 2304 err: 2305 CBB_cleanup(&cbb); 2306 2307 return (-1); 2308 } 2309 2310 static int 2311 ssl3_send_client_verify_sigalgs(SSL *s, CBB *cert_verify) 2312 { 2313 const struct ssl_sigalg *sigalg; 2314 CBB cbb_signature; 2315 EVP_PKEY_CTX *pctx = NULL; 2316 EVP_PKEY *pkey; 2317 EVP_MD_CTX mctx; 2318 const EVP_MD *md; 2319 const unsigned char *hdata; 2320 unsigned char *signature = NULL; 2321 size_t signature_len, hdata_len; 2322 int ret = 0; 2323 2324 EVP_MD_CTX_init(&mctx); 2325 2326 pkey = s->cert->key->privatekey; 2327 if ((sigalg = ssl_sigalg_select(s, pkey)) == NULL) { 2328 SSLerror(s, SSL_R_SIGNATURE_ALGORITHMS_ERROR); 2329 goto err; 2330 } 2331 if ((md = sigalg->md()) == NULL) { 2332 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2333 goto err; 2334 } 2335 2336 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2337 SSLerror(s, ERR_R_INTERNAL_ERROR); 2338 goto err; 2339 } 2340 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2341 SSLerror(s, ERR_R_EVP_LIB); 2342 goto err; 2343 } 2344 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2345 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2346 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2347 SSLerror(s, ERR_R_EVP_LIB); 2348 goto err; 2349 } 2350 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2351 (!EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) || 2352 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2353 SSLerror(s, ERR_R_EVP_LIB); 2354 goto err; 2355 } 2356 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2357 SSLerror(s, ERR_R_EVP_LIB); 2358 goto err; 2359 } 2360 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2361 signature_len == 0) { 2362 SSLerror(s, ERR_R_EVP_LIB); 2363 goto err; 2364 } 2365 if ((signature = calloc(1, signature_len)) == NULL) { 2366 SSLerror(s, ERR_R_MALLOC_FAILURE); 2367 goto err; 2368 } 2369 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2370 SSLerror(s, ERR_R_EVP_LIB); 2371 goto err; 2372 } 2373 2374 if (!CBB_add_u16(cert_verify, sigalg->value)) 2375 goto err; 2376 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2377 goto err; 2378 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2379 goto err; 2380 if (!CBB_flush(cert_verify)) 2381 goto err; 2382 2383 ret = 1; 2384 2385 err: 2386 EVP_MD_CTX_cleanup(&mctx); 2387 free(signature); 2388 return ret; 2389 } 2390 2391 static int 2392 ssl3_send_client_verify_rsa(SSL *s, CBB *cert_verify) 2393 { 2394 CBB cbb_signature; 2395 EVP_PKEY *pkey; 2396 unsigned char data[EVP_MAX_MD_SIZE]; 2397 unsigned char *signature = NULL; 2398 unsigned int signature_len; 2399 size_t data_len; 2400 int ret = 0; 2401 2402 pkey = s->cert->key->privatekey; 2403 2404 if (!tls1_transcript_hash_value(s, data, sizeof(data), &data_len)) 2405 goto err; 2406 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2407 goto err; 2408 if (RSA_sign(NID_md5_sha1, data, data_len, signature, 2409 &signature_len, pkey->pkey.rsa) <= 0 ) { 2410 SSLerror(s, ERR_R_RSA_LIB); 2411 goto err; 2412 } 2413 2414 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2415 goto err; 2416 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2417 goto err; 2418 if (!CBB_flush(cert_verify)) 2419 goto err; 2420 2421 ret = 1; 2422 err: 2423 free(signature); 2424 return ret; 2425 } 2426 2427 static int 2428 ssl3_send_client_verify_ec(SSL *s, CBB *cert_verify) 2429 { 2430 CBB cbb_signature; 2431 EVP_PKEY *pkey; 2432 unsigned char data[EVP_MAX_MD_SIZE]; 2433 unsigned char *signature = NULL; 2434 unsigned int signature_len; 2435 int ret = 0; 2436 2437 pkey = s->cert->key->privatekey; 2438 2439 if (!tls1_transcript_hash_value(s, data, sizeof(data), NULL)) 2440 goto err; 2441 if ((signature = calloc(1, EVP_PKEY_size(pkey))) == NULL) 2442 goto err; 2443 if (!ECDSA_sign(pkey->save_type, &data[MD5_DIGEST_LENGTH], 2444 SHA_DIGEST_LENGTH, signature, &signature_len, pkey->pkey.ec)) { 2445 SSLerror(s, ERR_R_ECDSA_LIB); 2446 goto err; 2447 } 2448 2449 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2450 goto err; 2451 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2452 goto err; 2453 if (!CBB_flush(cert_verify)) 2454 goto err; 2455 2456 ret = 1; 2457 err: 2458 free(signature); 2459 return ret; 2460 } 2461 2462 #ifndef OPENSSL_NO_GOST 2463 static int 2464 ssl3_send_client_verify_gost(SSL *s, CBB *cert_verify) 2465 { 2466 CBB cbb_signature; 2467 EVP_MD_CTX mctx; 2468 EVP_PKEY_CTX *pctx; 2469 EVP_PKEY *pkey; 2470 const EVP_MD *md; 2471 const unsigned char *hdata; 2472 unsigned char *signature = NULL; 2473 size_t signature_len; 2474 size_t hdata_len; 2475 int nid; 2476 int ret = 0; 2477 2478 EVP_MD_CTX_init(&mctx); 2479 2480 pkey = s->cert->key->privatekey; 2481 2482 if (!tls1_transcript_data(s, &hdata, &hdata_len)) { 2483 SSLerror(s, ERR_R_INTERNAL_ERROR); 2484 goto err; 2485 } 2486 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2487 (md = EVP_get_digestbynid(nid)) == NULL) { 2488 SSLerror(s, ERR_R_EVP_LIB); 2489 goto err; 2490 } 2491 if (!EVP_DigestSignInit(&mctx, &pctx, md, NULL, pkey)) { 2492 SSLerror(s, ERR_R_EVP_LIB); 2493 goto err; 2494 } 2495 if (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_SIGN, 2496 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, NULL) <= 0) { 2497 SSLerror(s, ERR_R_EVP_LIB); 2498 goto err; 2499 } 2500 if (!EVP_DigestSignUpdate(&mctx, hdata, hdata_len)) { 2501 SSLerror(s, ERR_R_EVP_LIB); 2502 goto err; 2503 } 2504 if (!EVP_DigestSignFinal(&mctx, NULL, &signature_len) || 2505 signature_len == 0) { 2506 SSLerror(s, ERR_R_EVP_LIB); 2507 goto err; 2508 } 2509 if ((signature = calloc(1, signature_len)) == NULL) { 2510 SSLerror(s, ERR_R_MALLOC_FAILURE); 2511 goto err; 2512 } 2513 if (!EVP_DigestSignFinal(&mctx, signature, &signature_len)) { 2514 SSLerror(s, ERR_R_EVP_LIB); 2515 goto err; 2516 } 2517 2518 if (!CBB_add_u16_length_prefixed(cert_verify, &cbb_signature)) 2519 goto err; 2520 if (!CBB_add_bytes(&cbb_signature, signature, signature_len)) 2521 goto err; 2522 if (!CBB_flush(cert_verify)) 2523 goto err; 2524 2525 ret = 1; 2526 err: 2527 EVP_MD_CTX_cleanup(&mctx); 2528 free(signature); 2529 return ret; 2530 } 2531 #endif 2532 2533 int 2534 ssl3_send_client_verify(SSL *s) 2535 { 2536 CBB cbb, cert_verify; 2537 EVP_PKEY *pkey; 2538 2539 memset(&cbb, 0, sizeof(cbb)); 2540 2541 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_VRFY_A) { 2542 if (!ssl3_handshake_msg_start(s, &cbb, &cert_verify, 2543 SSL3_MT_CERTIFICATE_VERIFY)) 2544 goto err; 2545 2546 pkey = s->cert->key->privatekey; 2547 2548 /* 2549 * For TLS v1.2 send signature algorithm and signature 2550 * using agreed digest and cached handshake records. 2551 */ 2552 if (SSL_USE_SIGALGS(s)) { 2553 if (!ssl3_send_client_verify_sigalgs(s, &cert_verify)) 2554 goto err; 2555 } else if (pkey->type == EVP_PKEY_RSA) { 2556 if (!ssl3_send_client_verify_rsa(s, &cert_verify)) 2557 goto err; 2558 } else if (pkey->type == EVP_PKEY_EC) { 2559 if (!ssl3_send_client_verify_ec(s, &cert_verify)) 2560 goto err; 2561 #ifndef OPENSSL_NO_GOST 2562 } else if (pkey->type == NID_id_GostR3410_94 || 2563 pkey->type == NID_id_GostR3410_2001) { 2564 if (!ssl3_send_client_verify_gost(s, &cert_verify)) 2565 goto err; 2566 #endif 2567 } else { 2568 SSLerror(s, ERR_R_INTERNAL_ERROR); 2569 goto err; 2570 } 2571 2572 tls1_transcript_free(s); 2573 2574 if (!ssl3_handshake_msg_finish(s, &cbb)) 2575 goto err; 2576 2577 S3I(s)->hs.state = SSL3_ST_CW_CERT_VRFY_B; 2578 } 2579 2580 return (ssl3_handshake_write(s)); 2581 2582 err: 2583 CBB_cleanup(&cbb); 2584 2585 return (-1); 2586 } 2587 2588 int 2589 ssl3_send_client_certificate(SSL *s) 2590 { 2591 EVP_PKEY *pkey = NULL; 2592 X509 *x509 = NULL; 2593 CBB cbb, client_cert; 2594 int i; 2595 2596 memset(&cbb, 0, sizeof(cbb)); 2597 2598 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_A) { 2599 if (s->cert->key->x509 == NULL || 2600 s->cert->key->privatekey == NULL) 2601 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2602 else 2603 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2604 } 2605 2606 /* We need to get a client cert */ 2607 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_B) { 2608 /* 2609 * If we get an error, we need to 2610 * ssl->rwstate=SSL_X509_LOOKUP; return(-1); 2611 * We then get retied later 2612 */ 2613 i = ssl_do_client_cert_cb(s, &x509, &pkey); 2614 if (i < 0) { 2615 s->internal->rwstate = SSL_X509_LOOKUP; 2616 return (-1); 2617 } 2618 s->internal->rwstate = SSL_NOTHING; 2619 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) { 2620 S3I(s)->hs.state = SSL3_ST_CW_CERT_B; 2621 if (!SSL_use_certificate(s, x509) || 2622 !SSL_use_PrivateKey(s, pkey)) 2623 i = 0; 2624 } else if (i == 1) { 2625 i = 0; 2626 SSLerror(s, SSL_R_BAD_DATA_RETURNED_BY_CALLBACK); 2627 } 2628 2629 X509_free(x509); 2630 EVP_PKEY_free(pkey); 2631 if (i == 0) { 2632 S3I(s)->tmp.cert_req = 2; 2633 2634 /* There is no client certificate to verify. */ 2635 tls1_transcript_free(s); 2636 } 2637 2638 /* Ok, we have a cert */ 2639 S3I(s)->hs.state = SSL3_ST_CW_CERT_C; 2640 } 2641 2642 if (S3I(s)->hs.state == SSL3_ST_CW_CERT_C) { 2643 if (!ssl3_handshake_msg_start(s, &cbb, &client_cert, 2644 SSL3_MT_CERTIFICATE)) 2645 goto err; 2646 if (!ssl3_output_cert_chain(s, &client_cert, 2647 (S3I(s)->tmp.cert_req == 2) ? NULL : s->cert->key)) 2648 goto err; 2649 if (!ssl3_handshake_msg_finish(s, &cbb)) 2650 goto err; 2651 2652 S3I(s)->hs.state = SSL3_ST_CW_CERT_D; 2653 } 2654 2655 /* SSL3_ST_CW_CERT_D */ 2656 return (ssl3_handshake_write(s)); 2657 2658 err: 2659 CBB_cleanup(&cbb); 2660 2661 return (0); 2662 } 2663 2664 #define has_bits(i,m) (((i)&(m)) == (m)) 2665 2666 int 2667 ssl3_check_cert_and_algorithm(SSL *s) 2668 { 2669 int i, idx; 2670 long alg_k, alg_a; 2671 EVP_PKEY *pkey = NULL; 2672 SESS_CERT *sc; 2673 DH *dh; 2674 2675 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2676 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2677 2678 /* We don't have a certificate. */ 2679 if (alg_a & SSL_aNULL) 2680 return (1); 2681 2682 sc = SSI(s)->sess_cert; 2683 if (sc == NULL) { 2684 SSLerror(s, ERR_R_INTERNAL_ERROR); 2685 goto err; 2686 } 2687 dh = SSI(s)->sess_cert->peer_dh_tmp; 2688 2689 /* This is the passed certificate. */ 2690 2691 idx = sc->peer_cert_type; 2692 if (idx == SSL_PKEY_ECC) { 2693 if (ssl_check_srvr_ecc_cert_and_alg( 2694 sc->peer_pkeys[idx].x509, s) == 0) { 2695 /* check failed */ 2696 SSLerror(s, SSL_R_BAD_ECC_CERT); 2697 goto f_err; 2698 } else { 2699 return (1); 2700 } 2701 } 2702 pkey = X509_get_pubkey(sc->peer_pkeys[idx].x509); 2703 i = X509_certificate_type(sc->peer_pkeys[idx].x509, pkey); 2704 EVP_PKEY_free(pkey); 2705 2706 /* Check that we have a certificate if we require one. */ 2707 if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_SIGN)) { 2708 SSLerror(s, SSL_R_MISSING_RSA_SIGNING_CERT); 2709 goto f_err; 2710 } 2711 if ((alg_k & SSL_kRSA) && !has_bits(i, EVP_PK_RSA|EVP_PKT_ENC)) { 2712 SSLerror(s, SSL_R_MISSING_RSA_ENCRYPTING_CERT); 2713 goto f_err; 2714 } 2715 if ((alg_k & SSL_kDHE) && 2716 !(has_bits(i, EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL))) { 2717 SSLerror(s, SSL_R_MISSING_DH_KEY); 2718 goto f_err; 2719 } 2720 2721 return (1); 2722 f_err: 2723 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 2724 err: 2725 return (0); 2726 } 2727 2728 /* 2729 * Check to see if handshake is full or resumed. Usually this is just a 2730 * case of checking to see if a cache hit has occurred. In the case of 2731 * session tickets we have to check the next message to be sure. 2732 */ 2733 2734 int 2735 ssl3_check_finished(SSL *s) 2736 { 2737 int ok; 2738 long n; 2739 2740 /* If we have no ticket it cannot be a resumed session. */ 2741 if (!s->session->tlsext_tick) 2742 return (1); 2743 /* this function is called when we really expect a Certificate 2744 * message, so permit appropriate message length */ 2745 n = ssl3_get_message(s, SSL3_ST_CR_CERT_A, 2746 SSL3_ST_CR_CERT_B, -1, s->internal->max_cert_list, &ok); 2747 if (!ok) 2748 return ((int)n); 2749 2750 S3I(s)->tmp.reuse_message = 1; 2751 if ((S3I(s)->tmp.message_type == SSL3_MT_FINISHED) || 2752 (S3I(s)->tmp.message_type == SSL3_MT_NEWSESSION_TICKET)) 2753 return (2); 2754 2755 return (1); 2756 } 2757 2758 int 2759 ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey) 2760 { 2761 int i = 0; 2762 2763 #ifndef OPENSSL_NO_ENGINE 2764 if (s->ctx->internal->client_cert_engine) { 2765 i = ENGINE_load_ssl_client_cert( 2766 s->ctx->internal->client_cert_engine, s, 2767 SSL_get_client_CA_list(s), px509, ppkey, NULL, NULL, NULL); 2768 if (i != 0) 2769 return (i); 2770 } 2771 #endif 2772 if (s->ctx->internal->client_cert_cb) 2773 i = s->ctx->internal->client_cert_cb(s, px509, ppkey); 2774 return (i); 2775 } 2776