1 /* $OpenBSD: ssl_srvr.c,v 1.149 2022/08/17 07:39:19 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 <stdio.h> 152 153 #include <openssl/bn.h> 154 #include <openssl/buffer.h> 155 #include <openssl/curve25519.h> 156 #include <openssl/evp.h> 157 #include <openssl/dh.h> 158 #include <openssl/hmac.h> 159 #include <openssl/md5.h> 160 #include <openssl/objects.h> 161 #include <openssl/opensslconf.h> 162 #include <openssl/x509.h> 163 164 #ifndef OPENSSL_NO_GOST 165 #include <openssl/gost.h> 166 #endif 167 168 #include "bytestring.h" 169 #include "dtls_locl.h" 170 #include "ssl_locl.h" 171 #include "ssl_sigalgs.h" 172 #include "ssl_tlsext.h" 173 174 int 175 ssl3_accept(SSL *s) 176 { 177 unsigned long alg_k; 178 int new_state, state, skip = 0; 179 int listen = 0; 180 int ret = -1; 181 182 ERR_clear_error(); 183 errno = 0; 184 185 if (SSL_is_dtls(s)) 186 listen = s->d1->listen; 187 188 /* init things to blank */ 189 s->internal->in_handshake++; 190 if (!SSL_in_init(s) || SSL_in_before(s)) 191 SSL_clear(s); 192 193 if (SSL_is_dtls(s)) 194 s->d1->listen = listen; 195 196 for (;;) { 197 state = s->s3->hs.state; 198 199 switch (s->s3->hs.state) { 200 case SSL_ST_RENEGOTIATE: 201 s->internal->renegotiate = 1; 202 /* s->s3->hs.state=SSL_ST_ACCEPT; */ 203 204 case SSL_ST_BEFORE: 205 case SSL_ST_ACCEPT: 206 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 207 case SSL_ST_OK|SSL_ST_ACCEPT: 208 s->server = 1; 209 210 ssl_info_callback(s, SSL_CB_HANDSHAKE_START, 1); 211 212 if (!ssl_legacy_stack_version(s, s->version)) { 213 SSLerror(s, ERR_R_INTERNAL_ERROR); 214 ret = -1; 215 goto end; 216 } 217 218 if (!ssl_supported_tls_version_range(s, 219 &s->s3->hs.our_min_tls_version, 220 &s->s3->hs.our_max_tls_version)) { 221 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 222 ret = -1; 223 goto end; 224 } 225 226 if (!ssl_security_version(s, 227 s->s3->hs.our_min_tls_version)) { 228 SSLerror(s, SSL_R_VERSION_TOO_LOW); 229 ret = -1; 230 goto end; 231 } 232 233 if (!ssl3_setup_init_buffer(s)) { 234 ret = -1; 235 goto end; 236 } 237 if (!ssl3_setup_buffers(s)) { 238 ret = -1; 239 goto end; 240 } 241 242 s->internal->init_num = 0; 243 244 if (s->s3->hs.state != SSL_ST_RENEGOTIATE) { 245 /* 246 * Ok, we now need to push on a buffering BIO 247 * so that the output is sent in a way that 248 * TCP likes :-) 249 */ 250 if (!ssl_init_wbio_buffer(s, 1)) { 251 ret = -1; 252 goto end; 253 } 254 255 if (!tls1_transcript_init(s)) { 256 ret = -1; 257 goto end; 258 } 259 260 s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_A; 261 s->ctx->internal->stats.sess_accept++; 262 } else if (!SSL_is_dtls(s) && !s->s3->send_connection_binding) { 263 /* 264 * Server attempting to renegotiate with 265 * client that doesn't support secure 266 * renegotiation. 267 */ 268 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 269 ssl3_send_alert(s, SSL3_AL_FATAL, 270 SSL_AD_HANDSHAKE_FAILURE); 271 ret = -1; 272 goto end; 273 } else { 274 /* 275 * s->s3->hs.state == SSL_ST_RENEGOTIATE, 276 * we will just send a HelloRequest. 277 */ 278 s->ctx->internal->stats.sess_accept_renegotiate++; 279 s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_A; 280 } 281 break; 282 283 case SSL3_ST_SW_HELLO_REQ_A: 284 case SSL3_ST_SW_HELLO_REQ_B: 285 s->internal->shutdown = 0; 286 if (SSL_is_dtls(s)) { 287 dtls1_clear_record_buffer(s); 288 dtls1_start_timer(s); 289 } 290 ret = ssl3_send_hello_request(s); 291 if (ret <= 0) 292 goto end; 293 if (SSL_is_dtls(s)) 294 s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A; 295 else 296 s->s3->hs.tls12.next_state = SSL3_ST_SW_HELLO_REQ_C; 297 s->s3->hs.state = SSL3_ST_SW_FLUSH; 298 s->internal->init_num = 0; 299 300 if (SSL_is_dtls(s)) { 301 if (!tls1_transcript_init(s)) { 302 ret = -1; 303 goto end; 304 } 305 } 306 break; 307 308 case SSL3_ST_SW_HELLO_REQ_C: 309 s->s3->hs.state = SSL_ST_OK; 310 break; 311 312 case SSL3_ST_SR_CLNT_HELLO_A: 313 case SSL3_ST_SR_CLNT_HELLO_B: 314 case SSL3_ST_SR_CLNT_HELLO_C: 315 s->internal->shutdown = 0; 316 if (SSL_is_dtls(s)) { 317 ret = ssl3_get_client_hello(s); 318 if (ret <= 0) 319 goto end; 320 dtls1_stop_timer(s); 321 322 if (ret == 1 && 323 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 324 s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 325 else 326 s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 327 328 s->internal->init_num = 0; 329 330 /* 331 * Reflect ClientHello sequence to remain 332 * stateless while listening. 333 */ 334 if (listen) { 335 tls12_record_layer_reflect_seq_num( 336 s->internal->rl); 337 } 338 339 /* If we're just listening, stop here */ 340 if (listen && s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 341 ret = 2; 342 s->d1->listen = 0; 343 /* 344 * Set expected sequence numbers to 345 * continue the handshake. 346 */ 347 s->d1->handshake_read_seq = 2; 348 s->d1->handshake_write_seq = 1; 349 s->d1->next_handshake_write_seq = 1; 350 goto end; 351 } 352 } else { 353 if (s->internal->rwstate != SSL_X509_LOOKUP) { 354 ret = ssl3_get_client_hello(s); 355 if (ret <= 0) 356 goto end; 357 } 358 359 s->internal->renegotiate = 2; 360 s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 361 s->internal->init_num = 0; 362 } 363 break; 364 365 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 366 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 367 ret = ssl3_send_dtls_hello_verify_request(s); 368 if (ret <= 0) 369 goto end; 370 s->s3->hs.state = SSL3_ST_SW_FLUSH; 371 s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A; 372 373 /* HelloVerifyRequest resets Finished MAC. */ 374 tls1_transcript_reset(s); 375 break; 376 377 case SSL3_ST_SW_SRVR_HELLO_A: 378 case SSL3_ST_SW_SRVR_HELLO_B: 379 if (SSL_is_dtls(s)) { 380 s->internal->renegotiate = 2; 381 dtls1_start_timer(s); 382 } 383 ret = ssl3_send_server_hello(s); 384 if (ret <= 0) 385 goto end; 386 if (s->internal->hit) { 387 if (s->internal->tlsext_ticket_expected) 388 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 389 else 390 s->s3->hs.state = SSL3_ST_SW_CHANGE_A; 391 } else { 392 s->s3->hs.state = SSL3_ST_SW_CERT_A; 393 } 394 s->internal->init_num = 0; 395 break; 396 397 case SSL3_ST_SW_CERT_A: 398 case SSL3_ST_SW_CERT_B: 399 /* Check if it is anon DH or anon ECDH. */ 400 if (!(s->s3->hs.cipher->algorithm_auth & 401 SSL_aNULL)) { 402 if (SSL_is_dtls(s)) 403 dtls1_start_timer(s); 404 ret = ssl3_send_server_certificate(s); 405 if (ret <= 0) 406 goto end; 407 if (s->internal->tlsext_status_expected) 408 s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_A; 409 else 410 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A; 411 } else { 412 skip = 1; 413 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A; 414 } 415 s->internal->init_num = 0; 416 break; 417 418 case SSL3_ST_SW_KEY_EXCH_A: 419 case SSL3_ST_SW_KEY_EXCH_B: 420 alg_k = s->s3->hs.cipher->algorithm_mkey; 421 422 /* 423 * Only send if using a DH key exchange. 424 * 425 * For ECC ciphersuites, we send a ServerKeyExchange 426 * message only if the cipher suite is ECDHE. In other 427 * cases, the server certificate contains the server's 428 * public key for key exchange. 429 */ 430 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 431 if (SSL_is_dtls(s)) 432 dtls1_start_timer(s); 433 ret = ssl3_send_server_key_exchange(s); 434 if (ret <= 0) 435 goto end; 436 } else 437 skip = 1; 438 439 s->s3->hs.state = SSL3_ST_SW_CERT_REQ_A; 440 s->internal->init_num = 0; 441 break; 442 443 case SSL3_ST_SW_CERT_REQ_A: 444 case SSL3_ST_SW_CERT_REQ_B: 445 /* 446 * Determine whether or not we need to request a 447 * certificate. 448 * 449 * Do not request a certificate if: 450 * 451 * - We did not ask for it (SSL_VERIFY_PEER is unset). 452 * 453 * - SSL_VERIFY_CLIENT_ONCE is set and we are 454 * renegotiating. 455 * 456 * - We are using an anonymous ciphersuites 457 * (see section "Certificate request" in SSL 3 drafts 458 * and in RFC 2246) ... except when the application 459 * insists on verification (against the specs, but 460 * s3_clnt.c accepts this for SSL 3). 461 */ 462 if (!(s->verify_mode & SSL_VERIFY_PEER) || 463 ((s->session->peer_cert != NULL) && 464 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 465 ((s->s3->hs.cipher->algorithm_auth & 466 SSL_aNULL) && !(s->verify_mode & 467 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) { 468 /* No cert request. */ 469 skip = 1; 470 s->s3->hs.tls12.cert_request = 0; 471 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A; 472 473 if (!SSL_is_dtls(s)) 474 tls1_transcript_free(s); 475 } else { 476 s->s3->hs.tls12.cert_request = 1; 477 if (SSL_is_dtls(s)) 478 dtls1_start_timer(s); 479 ret = ssl3_send_certificate_request(s); 480 if (ret <= 0) 481 goto end; 482 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A; 483 s->internal->init_num = 0; 484 } 485 break; 486 487 case SSL3_ST_SW_SRVR_DONE_A: 488 case SSL3_ST_SW_SRVR_DONE_B: 489 if (SSL_is_dtls(s)) 490 dtls1_start_timer(s); 491 ret = ssl3_send_server_done(s); 492 if (ret <= 0) 493 goto end; 494 s->s3->hs.tls12.next_state = SSL3_ST_SR_CERT_A; 495 s->s3->hs.state = SSL3_ST_SW_FLUSH; 496 s->internal->init_num = 0; 497 break; 498 499 case SSL3_ST_SW_FLUSH: 500 /* 501 * This code originally checked to see if 502 * any data was pending using BIO_CTRL_INFO 503 * and then flushed. This caused problems 504 * as documented in PR#1939. The proposed 505 * fix doesn't completely resolve this issue 506 * as buggy implementations of BIO_CTRL_PENDING 507 * still exist. So instead we just flush 508 * unconditionally. 509 */ 510 s->internal->rwstate = SSL_WRITING; 511 if (BIO_flush(s->wbio) <= 0) { 512 if (SSL_is_dtls(s)) { 513 /* If the write error was fatal, stop trying. */ 514 if (!BIO_should_retry(s->wbio)) { 515 s->internal->rwstate = SSL_NOTHING; 516 s->s3->hs.state = s->s3->hs.tls12.next_state; 517 } 518 } 519 ret = -1; 520 goto end; 521 } 522 s->internal->rwstate = SSL_NOTHING; 523 s->s3->hs.state = s->s3->hs.tls12.next_state; 524 break; 525 526 case SSL3_ST_SR_CERT_A: 527 case SSL3_ST_SR_CERT_B: 528 if (s->s3->hs.tls12.cert_request != 0) { 529 ret = ssl3_get_client_certificate(s); 530 if (ret <= 0) 531 goto end; 532 } 533 s->internal->init_num = 0; 534 s->s3->hs.state = SSL3_ST_SR_KEY_EXCH_A; 535 break; 536 537 case SSL3_ST_SR_KEY_EXCH_A: 538 case SSL3_ST_SR_KEY_EXCH_B: 539 ret = ssl3_get_client_key_exchange(s); 540 if (ret <= 0) 541 goto end; 542 543 if (SSL_is_dtls(s)) { 544 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A; 545 s->internal->init_num = 0; 546 } 547 548 alg_k = s->s3->hs.cipher->algorithm_mkey; 549 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 550 /* 551 * A GOST client may use the key from its 552 * certificate for key exchange, in which case 553 * the CertificateVerify message is not sent. 554 */ 555 s->s3->hs.state = SSL3_ST_SR_FINISHED_A; 556 s->internal->init_num = 0; 557 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) { 558 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A; 559 s->internal->init_num = 0; 560 if (!s->session->peer_cert) 561 break; 562 /* 563 * Freeze the transcript for use during client 564 * certificate verification. 565 */ 566 tls1_transcript_freeze(s); 567 } else { 568 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A; 569 s->internal->init_num = 0; 570 571 tls1_transcript_free(s); 572 573 /* 574 * We need to get hashes here so if there is 575 * a client cert, it can be verified. 576 */ 577 if (!tls1_transcript_hash_value(s, 578 s->s3->hs.tls12.cert_verify, 579 sizeof(s->s3->hs.tls12.cert_verify), 580 NULL)) { 581 ret = -1; 582 goto end; 583 } 584 } 585 break; 586 587 case SSL3_ST_SR_CERT_VRFY_A: 588 case SSL3_ST_SR_CERT_VRFY_B: 589 if (SSL_is_dtls(s)) 590 s->d1->change_cipher_spec_ok = 1; 591 else 592 s->s3->flags |= SSL3_FLAGS_CCS_OK; 593 594 /* we should decide if we expected this one */ 595 ret = ssl3_get_cert_verify(s); 596 if (ret <= 0) 597 goto end; 598 s->s3->hs.state = SSL3_ST_SR_FINISHED_A; 599 s->internal->init_num = 0; 600 break; 601 602 case SSL3_ST_SR_FINISHED_A: 603 case SSL3_ST_SR_FINISHED_B: 604 if (SSL_is_dtls(s)) 605 s->d1->change_cipher_spec_ok = 1; 606 else 607 s->s3->flags |= SSL3_FLAGS_CCS_OK; 608 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 609 SSL3_ST_SR_FINISHED_B); 610 if (ret <= 0) 611 goto end; 612 if (SSL_is_dtls(s)) 613 dtls1_stop_timer(s); 614 if (s->internal->hit) 615 s->s3->hs.state = SSL_ST_OK; 616 else if (s->internal->tlsext_ticket_expected) 617 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 618 else 619 s->s3->hs.state = SSL3_ST_SW_CHANGE_A; 620 s->internal->init_num = 0; 621 break; 622 623 case SSL3_ST_SW_SESSION_TICKET_A: 624 case SSL3_ST_SW_SESSION_TICKET_B: 625 ret = ssl3_send_newsession_ticket(s); 626 if (ret <= 0) 627 goto end; 628 s->s3->hs.state = SSL3_ST_SW_CHANGE_A; 629 s->internal->init_num = 0; 630 break; 631 632 case SSL3_ST_SW_CERT_STATUS_A: 633 case SSL3_ST_SW_CERT_STATUS_B: 634 ret = ssl3_send_cert_status(s); 635 if (ret <= 0) 636 goto end; 637 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A; 638 s->internal->init_num = 0; 639 break; 640 641 case SSL3_ST_SW_CHANGE_A: 642 case SSL3_ST_SW_CHANGE_B: 643 ret = ssl3_send_change_cipher_spec(s, 644 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B); 645 if (ret <= 0) 646 goto end; 647 s->s3->hs.state = SSL3_ST_SW_FINISHED_A; 648 s->internal->init_num = 0; 649 s->session->cipher = s->s3->hs.cipher; 650 651 if (!tls1_setup_key_block(s)) { 652 ret = -1; 653 goto end; 654 } 655 if (!tls1_change_write_cipher_state(s)) { 656 ret = -1; 657 goto end; 658 } 659 break; 660 661 case SSL3_ST_SW_FINISHED_A: 662 case SSL3_ST_SW_FINISHED_B: 663 ret = ssl3_send_finished(s, SSL3_ST_SW_FINISHED_A, 664 SSL3_ST_SW_FINISHED_B); 665 if (ret <= 0) 666 goto end; 667 s->s3->hs.state = SSL3_ST_SW_FLUSH; 668 if (s->internal->hit) { 669 s->s3->hs.tls12.next_state = SSL3_ST_SR_FINISHED_A; 670 tls1_transcript_free(s); 671 } else 672 s->s3->hs.tls12.next_state = SSL_ST_OK; 673 s->internal->init_num = 0; 674 break; 675 676 case SSL_ST_OK: 677 /* clean a few things up */ 678 tls1_cleanup_key_block(s); 679 680 if (s->s3->handshake_transcript != NULL) { 681 SSLerror(s, ERR_R_INTERNAL_ERROR); 682 ret = -1; 683 goto end; 684 } 685 686 if (!SSL_is_dtls(s)) 687 ssl3_release_init_buffer(s); 688 689 /* remove buffering on output */ 690 ssl_free_wbio_buffer(s); 691 692 s->internal->init_num = 0; 693 694 /* Skipped if we just sent a HelloRequest. */ 695 if (s->internal->renegotiate == 2) { 696 s->internal->renegotiate = 0; 697 s->internal->new_session = 0; 698 699 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 700 701 s->ctx->internal->stats.sess_accept_good++; 702 /* s->server=1; */ 703 s->internal->handshake_func = ssl3_accept; 704 705 ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1); 706 } 707 708 ret = 1; 709 710 if (SSL_is_dtls(s)) { 711 /* Done handshaking, next message is client hello. */ 712 s->d1->handshake_read_seq = 0; 713 /* Next message is server hello. */ 714 s->d1->handshake_write_seq = 0; 715 s->d1->next_handshake_write_seq = 0; 716 } 717 goto end; 718 /* break; */ 719 720 default: 721 SSLerror(s, SSL_R_UNKNOWN_STATE); 722 ret = -1; 723 goto end; 724 /* break; */ 725 } 726 727 if (!s->s3->hs.tls12.reuse_message && !skip) { 728 if (s->internal->debug) { 729 if ((ret = BIO_flush(s->wbio)) <= 0) 730 goto end; 731 } 732 733 734 if (s->s3->hs.state != state) { 735 new_state = s->s3->hs.state; 736 s->s3->hs.state = state; 737 ssl_info_callback(s, SSL_CB_ACCEPT_LOOP, 1); 738 s->s3->hs.state = new_state; 739 } 740 } 741 skip = 0; 742 } 743 end: 744 /* BIO_flush(s->wbio); */ 745 s->internal->in_handshake--; 746 ssl_info_callback(s, SSL_CB_ACCEPT_EXIT, ret); 747 748 return (ret); 749 } 750 751 int 752 ssl3_send_hello_request(SSL *s) 753 { 754 CBB cbb, hello; 755 756 memset(&cbb, 0, sizeof(cbb)); 757 758 if (s->s3->hs.state == SSL3_ST_SW_HELLO_REQ_A) { 759 if (!ssl3_handshake_msg_start(s, &cbb, &hello, 760 SSL3_MT_HELLO_REQUEST)) 761 goto err; 762 if (!ssl3_handshake_msg_finish(s, &cbb)) 763 goto err; 764 765 s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_B; 766 } 767 768 /* SSL3_ST_SW_HELLO_REQ_B */ 769 return (ssl3_handshake_write(s)); 770 771 err: 772 CBB_cleanup(&cbb); 773 774 return (-1); 775 } 776 777 int 778 ssl3_get_client_hello(SSL *s) 779 { 780 CBS cbs, client_random, session_id, cookie, cipher_suites; 781 CBS compression_methods; 782 uint16_t client_version; 783 uint8_t comp_method; 784 int comp_null; 785 int i, j, al, ret, cookie_valid = 0; 786 unsigned long id; 787 SSL_CIPHER *c; 788 STACK_OF(SSL_CIPHER) *ciphers = NULL; 789 unsigned long alg_k; 790 const SSL_METHOD *method; 791 uint16_t shared_version; 792 793 /* 794 * We do this so that we will respond with our native type. 795 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, 796 * This down switching should be handled by a different method. 797 * If we are SSLv3, we will respond with SSLv3, even if prompted with 798 * TLSv1. 799 */ 800 if (s->s3->hs.state == SSL3_ST_SR_CLNT_HELLO_A) 801 s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_B; 802 803 s->internal->first_packet = 1; 804 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, 805 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, 806 SSL3_RT_MAX_PLAIN_LENGTH)) <= 0) 807 return ret; 808 s->internal->first_packet = 0; 809 810 ret = -1; 811 812 if (s->internal->init_num < 0) 813 goto err; 814 815 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 816 817 /* Parse client hello up until the extensions (if any). */ 818 if (!CBS_get_u16(&cbs, &client_version)) 819 goto decode_err; 820 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE)) 821 goto decode_err; 822 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 823 goto decode_err; 824 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 825 al = SSL_AD_ILLEGAL_PARAMETER; 826 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 827 goto fatal_err; 828 } 829 if (SSL_is_dtls(s)) { 830 if (!CBS_get_u8_length_prefixed(&cbs, &cookie)) 831 goto decode_err; 832 } 833 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites)) 834 goto decode_err; 835 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods)) 836 goto decode_err; 837 838 /* 839 * Use version from inside client hello, not from record header. 840 * (may differ: see RFC 2246, Appendix E, second paragraph) 841 */ 842 if (!ssl_max_shared_version(s, client_version, &shared_version)) { 843 if ((client_version >> 8) == SSL3_VERSION_MAJOR && 844 !tls12_record_layer_write_protected(s->internal->rl)) { 845 /* 846 * Similar to ssl3_get_record, send alert using remote 847 * version number. 848 */ 849 s->version = client_version; 850 } 851 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER); 852 al = SSL_AD_PROTOCOL_VERSION; 853 goto fatal_err; 854 } 855 s->s3->hs.peer_legacy_version = client_version; 856 s->version = shared_version; 857 858 s->s3->hs.negotiated_tls_version = ssl_tls_version(shared_version); 859 if (s->s3->hs.negotiated_tls_version == 0) { 860 SSLerror(s, ERR_R_INTERNAL_ERROR); 861 goto err; 862 } 863 864 if ((method = ssl_get_method(shared_version)) == NULL) { 865 SSLerror(s, ERR_R_INTERNAL_ERROR); 866 goto err; 867 } 868 s->method = method; 869 870 /* 871 * If we require cookies (DTLS) and this ClientHello does not contain 872 * one, just return since we do not want to allocate any memory yet. 873 * So check cookie length... 874 */ 875 if (SSL_is_dtls(s)) { 876 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 877 if (CBS_len(&cookie) == 0) 878 return (1); 879 } 880 } 881 882 if (!CBS_write_bytes(&client_random, s->s3->client_random, 883 sizeof(s->s3->client_random), NULL)) 884 goto err; 885 886 s->internal->hit = 0; 887 888 /* 889 * Versions before 0.9.7 always allow clients to resume sessions in 890 * renegotiation. 0.9.7 and later allow this by default, but optionally 891 * ignore resumption requests with flag 892 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag 893 * rather than a change to default behavior so that applications 894 * relying on this for security won't even compile against older 895 * library versions). 896 * 897 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() 898 * to request renegotiation but not a new session (s->internal->new_session 899 * remains unset): for servers, this essentially just means that the 900 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be 901 * ignored. 902 */ 903 if ((s->internal->new_session && (s->internal->options & 904 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { 905 if (!ssl_get_new_session(s, 1)) 906 goto err; 907 } else { 908 CBS ext_block; 909 910 CBS_dup(&cbs, &ext_block); 911 912 i = ssl_get_prev_session(s, &session_id, &ext_block, &al); 913 if (i == 1) { /* previous session */ 914 s->internal->hit = 1; 915 } else if (i == -1) 916 goto fatal_err; 917 else { 918 /* i == 0 */ 919 if (!ssl_get_new_session(s, 1)) 920 goto err; 921 } 922 } 923 924 if (SSL_is_dtls(s)) { 925 /* 926 * The ClientHello may contain a cookie even if the HelloVerify 927 * message has not been sent - make sure that it does not cause 928 * an overflow. 929 */ 930 if (CBS_len(&cookie) > sizeof(s->d1->rcvd_cookie)) { 931 al = SSL_AD_DECODE_ERROR; 932 SSLerror(s, SSL_R_COOKIE_MISMATCH); 933 goto fatal_err; 934 } 935 936 /* Verify the cookie if appropriate option is set. */ 937 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && 938 CBS_len(&cookie) > 0) { 939 size_t cookie_len; 940 941 /* XXX - rcvd_cookie seems to only be used here... */ 942 if (!CBS_write_bytes(&cookie, s->d1->rcvd_cookie, 943 sizeof(s->d1->rcvd_cookie), &cookie_len)) 944 goto err; 945 946 if (s->ctx->internal->app_verify_cookie_cb != NULL) { 947 if (s->ctx->internal->app_verify_cookie_cb(s, 948 s->d1->rcvd_cookie, cookie_len) == 0) { 949 al = SSL_AD_HANDSHAKE_FAILURE; 950 SSLerror(s, SSL_R_COOKIE_MISMATCH); 951 goto fatal_err; 952 } 953 /* else cookie verification succeeded */ 954 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */ 955 } else if (timingsafe_memcmp(s->d1->rcvd_cookie, 956 s->d1->cookie, s->d1->cookie_len) != 0) { 957 /* default verification */ 958 al = SSL_AD_HANDSHAKE_FAILURE; 959 SSLerror(s, SSL_R_COOKIE_MISMATCH); 960 goto fatal_err; 961 } 962 cookie_valid = 1; 963 } 964 } 965 966 /* XXX - This logic seems wrong... */ 967 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) { 968 /* we need a cipher if we are not resuming a session */ 969 al = SSL_AD_ILLEGAL_PARAMETER; 970 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED); 971 goto fatal_err; 972 } 973 974 if (CBS_len(&cipher_suites) > 0) { 975 if ((ciphers = ssl_bytes_to_cipher_list(s, 976 &cipher_suites)) == NULL) 977 goto err; 978 } 979 980 /* If it is a hit, check that the cipher is in the list */ 981 /* XXX - CBS_len(&cipher_suites) will always be zero here... */ 982 if (s->internal->hit && CBS_len(&cipher_suites) > 0) { 983 j = 0; 984 id = s->session->cipher->id; 985 986 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 987 c = sk_SSL_CIPHER_value(ciphers, i); 988 if (c->id == id) { 989 j = 1; 990 break; 991 } 992 } 993 if (j == 0) { 994 /* 995 * We need to have the cipher in the cipher 996 * list if we are asked to reuse it 997 */ 998 al = SSL_AD_ILLEGAL_PARAMETER; 999 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING); 1000 goto fatal_err; 1001 } 1002 } 1003 1004 comp_null = 0; 1005 while (CBS_len(&compression_methods) > 0) { 1006 if (!CBS_get_u8(&compression_methods, &comp_method)) 1007 goto decode_err; 1008 if (comp_method == 0) 1009 comp_null = 1; 1010 } 1011 if (comp_null == 0) { 1012 al = SSL_AD_DECODE_ERROR; 1013 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED); 1014 goto fatal_err; 1015 } 1016 1017 if (!tlsext_server_parse(s, SSL_TLSEXT_MSG_CH, &cbs, &al)) { 1018 SSLerror(s, SSL_R_PARSE_TLSEXT); 1019 goto fatal_err; 1020 } 1021 1022 if (CBS_len(&cbs) != 0) 1023 goto decode_err; 1024 1025 if (!s->s3->renegotiate_seen && s->internal->renegotiate) { 1026 al = SSL_AD_HANDSHAKE_FAILURE; 1027 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1028 goto fatal_err; 1029 } 1030 1031 if (ssl_check_clienthello_tlsext_early(s) <= 0) { 1032 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1033 goto err; 1034 } 1035 1036 /* 1037 * Check if we want to use external pre-shared secret for this 1038 * handshake for not reused session only. We need to generate 1039 * server_random before calling tls_session_secret_cb in order to allow 1040 * SessionTicket processing to use it in key derivation. 1041 */ 1042 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE); 1043 1044 if (s->s3->hs.our_max_tls_version >= TLS1_2_VERSION && 1045 s->s3->hs.negotiated_tls_version < s->s3->hs.our_max_tls_version) { 1046 /* 1047 * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3 1048 * we must set the last 8 bytes of the server random to magical 1049 * values to indicate we meant to downgrade. For TLS 1.2 it is 1050 * recommended that we do the same. 1051 */ 1052 size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12); 1053 uint8_t *magic = &s->s3->server_random[index]; 1054 if (s->s3->hs.negotiated_tls_version == TLS1_2_VERSION) { 1055 /* Indicate we chose to downgrade to 1.2. */ 1056 memcpy(magic, tls13_downgrade_12, 1057 sizeof(tls13_downgrade_12)); 1058 } else { 1059 /* Indicate we chose to downgrade to 1.1 or lower */ 1060 memcpy(magic, tls13_downgrade_11, 1061 sizeof(tls13_downgrade_11)); 1062 } 1063 } 1064 1065 if (!s->internal->hit && s->internal->tls_session_secret_cb != NULL) { 1066 SSL_CIPHER *pref_cipher = NULL; 1067 int master_key_length = sizeof(s->session->master_key); 1068 1069 if (!s->internal->tls_session_secret_cb(s, 1070 s->session->master_key, &master_key_length, ciphers, 1071 &pref_cipher, s->internal->tls_session_secret_cb_arg)) { 1072 SSLerror(s, ERR_R_INTERNAL_ERROR); 1073 goto err; 1074 } 1075 if (master_key_length <= 0) { 1076 SSLerror(s, ERR_R_INTERNAL_ERROR); 1077 goto err; 1078 } 1079 s->session->master_key_length = master_key_length; 1080 1081 s->internal->hit = 1; 1082 s->session->verify_result = X509_V_OK; 1083 1084 sk_SSL_CIPHER_free(s->session->ciphers); 1085 s->session->ciphers = ciphers; 1086 ciphers = NULL; 1087 1088 /* Check if some cipher was preferred by the callback. */ 1089 if (pref_cipher == NULL) 1090 pref_cipher = ssl3_choose_cipher(s, s->session->ciphers, 1091 SSL_get_ciphers(s)); 1092 if (pref_cipher == NULL) { 1093 al = SSL_AD_HANDSHAKE_FAILURE; 1094 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1095 goto fatal_err; 1096 } 1097 s->session->cipher = pref_cipher; 1098 1099 sk_SSL_CIPHER_free(s->cipher_list); 1100 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); 1101 } 1102 1103 /* 1104 * Given s->session->ciphers and SSL_get_ciphers, we must 1105 * pick a cipher 1106 */ 1107 1108 if (!s->internal->hit) { 1109 if (ciphers == NULL) { 1110 al = SSL_AD_ILLEGAL_PARAMETER; 1111 SSLerror(s, SSL_R_NO_CIPHERS_PASSED); 1112 goto fatal_err; 1113 } 1114 sk_SSL_CIPHER_free(s->session->ciphers); 1115 s->session->ciphers = ciphers; 1116 ciphers = NULL; 1117 1118 if ((c = ssl3_choose_cipher(s, s->session->ciphers, 1119 SSL_get_ciphers(s))) == NULL) { 1120 al = SSL_AD_HANDSHAKE_FAILURE; 1121 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1122 goto fatal_err; 1123 } 1124 s->s3->hs.cipher = c; 1125 } else { 1126 s->s3->hs.cipher = s->session->cipher; 1127 } 1128 1129 if (!tls1_transcript_hash_init(s)) 1130 goto err; 1131 1132 alg_k = s->s3->hs.cipher->algorithm_mkey; 1133 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) || 1134 !(s->verify_mode & SSL_VERIFY_PEER)) 1135 tls1_transcript_free(s); 1136 1137 /* 1138 * We now have the following setup. 1139 * client_random 1140 * cipher_list - our prefered list of ciphers 1141 * ciphers - the clients prefered list of ciphers 1142 * compression - basically ignored right now 1143 * ssl version is set - sslv3 1144 * s->session - The ssl session has been setup. 1145 * s->internal->hit - session reuse flag 1146 * s->hs.cipher - the new cipher to use. 1147 */ 1148 1149 /* Handles TLS extensions that we couldn't check earlier */ 1150 if (ssl_check_clienthello_tlsext_late(s) <= 0) { 1151 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1152 goto err; 1153 } 1154 1155 ret = cookie_valid ? 2 : 1; 1156 1157 if (0) { 1158 decode_err: 1159 al = SSL_AD_DECODE_ERROR; 1160 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1161 fatal_err: 1162 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1163 } 1164 err: 1165 sk_SSL_CIPHER_free(ciphers); 1166 1167 return (ret); 1168 } 1169 1170 int 1171 ssl3_send_dtls_hello_verify_request(SSL *s) 1172 { 1173 CBB cbb, verify, cookie; 1174 1175 memset(&cbb, 0, sizeof(cbb)); 1176 1177 if (s->s3->hs.state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 1178 if (s->ctx->internal->app_gen_cookie_cb == NULL || 1179 s->ctx->internal->app_gen_cookie_cb(s, s->d1->cookie, 1180 &(s->d1->cookie_len)) == 0) { 1181 SSLerror(s, ERR_R_INTERNAL_ERROR); 1182 return 0; 1183 } 1184 1185 /* 1186 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should 1187 * always contain DTLSv1.0 regardless of the version that is 1188 * going to be negotiated. 1189 */ 1190 if (!ssl3_handshake_msg_start(s, &cbb, &verify, 1191 DTLS1_MT_HELLO_VERIFY_REQUEST)) 1192 goto err; 1193 if (!CBB_add_u16(&verify, DTLS1_VERSION)) 1194 goto err; 1195 if (!CBB_add_u8_length_prefixed(&verify, &cookie)) 1196 goto err; 1197 if (!CBB_add_bytes(&cookie, s->d1->cookie, s->d1->cookie_len)) 1198 goto err; 1199 if (!ssl3_handshake_msg_finish(s, &cbb)) 1200 goto err; 1201 1202 s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 1203 } 1204 1205 /* s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 1206 return (ssl3_handshake_write(s)); 1207 1208 err: 1209 CBB_cleanup(&cbb); 1210 1211 return (-1); 1212 } 1213 1214 int 1215 ssl3_send_server_hello(SSL *s) 1216 { 1217 CBB cbb, server_hello, session_id; 1218 size_t sl; 1219 1220 memset(&cbb, 0, sizeof(cbb)); 1221 1222 if (s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 1223 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello, 1224 SSL3_MT_SERVER_HELLO)) 1225 goto err; 1226 1227 if (!CBB_add_u16(&server_hello, s->version)) 1228 goto err; 1229 if (!CBB_add_bytes(&server_hello, s->s3->server_random, 1230 sizeof(s->s3->server_random))) 1231 goto err; 1232 1233 /* 1234 * There are several cases for the session ID to send 1235 * back in the server hello: 1236 * 1237 * - For session reuse from the session cache, 1238 * we send back the old session ID. 1239 * - If stateless session reuse (using a session ticket) 1240 * is successful, we send back the client's "session ID" 1241 * (which doesn't actually identify the session). 1242 * - If it is a new session, we send back the new 1243 * session ID. 1244 * - However, if we want the new session to be single-use, 1245 * we send back a 0-length session ID. 1246 * 1247 * s->internal->hit is non-zero in either case of session reuse, 1248 * so the following won't overwrite an ID that we're supposed 1249 * to send back. 1250 */ 1251 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER) 1252 && !s->internal->hit) 1253 s->session->session_id_length = 0; 1254 1255 sl = s->session->session_id_length; 1256 if (sl > sizeof(s->session->session_id)) { 1257 SSLerror(s, ERR_R_INTERNAL_ERROR); 1258 goto err; 1259 } 1260 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) 1261 goto err; 1262 if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) 1263 goto err; 1264 1265 /* Cipher suite. */ 1266 if (!CBB_add_u16(&server_hello, 1267 ssl3_cipher_get_value(s->s3->hs.cipher))) 1268 goto err; 1269 1270 /* Compression method (null). */ 1271 if (!CBB_add_u8(&server_hello, 0)) 1272 goto err; 1273 1274 /* TLS extensions */ 1275 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) { 1276 SSLerror(s, ERR_R_INTERNAL_ERROR); 1277 goto err; 1278 } 1279 1280 if (!ssl3_handshake_msg_finish(s, &cbb)) 1281 goto err; 1282 } 1283 1284 /* SSL3_ST_SW_SRVR_HELLO_B */ 1285 return (ssl3_handshake_write(s)); 1286 1287 err: 1288 CBB_cleanup(&cbb); 1289 1290 return (-1); 1291 } 1292 1293 int 1294 ssl3_send_server_done(SSL *s) 1295 { 1296 CBB cbb, done; 1297 1298 memset(&cbb, 0, sizeof(cbb)); 1299 1300 if (s->s3->hs.state == SSL3_ST_SW_SRVR_DONE_A) { 1301 if (!ssl3_handshake_msg_start(s, &cbb, &done, 1302 SSL3_MT_SERVER_DONE)) 1303 goto err; 1304 if (!ssl3_handshake_msg_finish(s, &cbb)) 1305 goto err; 1306 1307 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_B; 1308 } 1309 1310 /* SSL3_ST_SW_SRVR_DONE_B */ 1311 return (ssl3_handshake_write(s)); 1312 1313 err: 1314 CBB_cleanup(&cbb); 1315 1316 return (-1); 1317 } 1318 1319 static int 1320 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) 1321 { 1322 int nid = NID_dhKeyAgreement; 1323 1324 tls_key_share_free(s->s3->hs.key_share); 1325 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1326 goto err; 1327 1328 if (s->cert->dhe_params_auto != 0) { 1329 size_t key_bits; 1330 1331 if ((key_bits = ssl_dhe_params_auto_key_bits(s)) == 0) { 1332 SSLerror(s, ERR_R_INTERNAL_ERROR); 1333 ssl3_send_alert(s, SSL3_AL_FATAL, 1334 SSL_AD_INTERNAL_ERROR); 1335 goto err; 1336 } 1337 tls_key_share_set_key_bits(s->s3->hs.key_share, 1338 key_bits); 1339 } else { 1340 DH *dh_params = s->cert->dhe_params; 1341 1342 if (dh_params == NULL && s->cert->dhe_params_cb != NULL) 1343 dh_params = s->cert->dhe_params_cb(s, 0, 1344 SSL_C_PKEYLENGTH(s->s3->hs.cipher)); 1345 1346 if (dh_params == NULL) { 1347 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1348 ssl3_send_alert(s, SSL3_AL_FATAL, 1349 SSL_AD_HANDSHAKE_FAILURE); 1350 goto err; 1351 } 1352 1353 if (!tls_key_share_set_dh_params(s->s3->hs.key_share, dh_params)) 1354 goto err; 1355 } 1356 1357 if (!tls_key_share_generate(s->s3->hs.key_share)) 1358 goto err; 1359 1360 if (!tls_key_share_params(s->s3->hs.key_share, cbb)) 1361 goto err; 1362 if (!tls_key_share_public(s->s3->hs.key_share, cbb)) 1363 goto err; 1364 1365 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) { 1366 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL); 1367 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1368 return 0; 1369 } 1370 1371 return 1; 1372 1373 err: 1374 return 0; 1375 } 1376 1377 static int 1378 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) 1379 { 1380 CBB public; 1381 int nid; 1382 1383 if (!tls1_get_supported_group(s, &nid)) { 1384 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1385 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1386 goto err; 1387 } 1388 1389 tls_key_share_free(s->s3->hs.key_share); 1390 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1391 goto err; 1392 1393 if (!tls_key_share_generate(s->s3->hs.key_share)) 1394 goto err; 1395 1396 /* 1397 * ECC key exchange - see RFC 8422, section 5.4. 1398 */ 1399 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1400 goto err; 1401 if (!CBB_add_u16(cbb, tls_key_share_group(s->s3->hs.key_share))) 1402 goto err; 1403 if (!CBB_add_u8_length_prefixed(cbb, &public)) 1404 goto err; 1405 if (!tls_key_share_public(s->s3->hs.key_share, &public)) 1406 goto err; 1407 if (!CBB_flush(cbb)) 1408 goto err; 1409 1410 return 1; 1411 1412 err: 1413 return 0; 1414 } 1415 1416 int 1417 ssl3_send_server_key_exchange(SSL *s) 1418 { 1419 CBB cbb, cbb_params, cbb_signature, server_kex; 1420 const struct ssl_sigalg *sigalg = NULL; 1421 unsigned char *signature = NULL; 1422 size_t signature_len = 0; 1423 unsigned char *params = NULL; 1424 size_t params_len; 1425 const EVP_MD *md = NULL; 1426 unsigned long type; 1427 EVP_MD_CTX *md_ctx = NULL; 1428 EVP_PKEY_CTX *pctx; 1429 EVP_PKEY *pkey; 1430 int al; 1431 1432 memset(&cbb, 0, sizeof(cbb)); 1433 memset(&cbb_params, 0, sizeof(cbb_params)); 1434 1435 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 1436 goto err; 1437 1438 if (s->s3->hs.state == SSL3_ST_SW_KEY_EXCH_A) { 1439 1440 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex, 1441 SSL3_MT_SERVER_KEY_EXCHANGE)) 1442 goto err; 1443 1444 if (!CBB_init(&cbb_params, 0)) 1445 goto err; 1446 1447 type = s->s3->hs.cipher->algorithm_mkey; 1448 if (type & SSL_kDHE) { 1449 if (!ssl3_send_server_kex_dhe(s, &cbb_params)) 1450 goto err; 1451 } else if (type & SSL_kECDHE) { 1452 if (!ssl3_send_server_kex_ecdhe(s, &cbb_params)) 1453 goto err; 1454 } else { 1455 al = SSL_AD_HANDSHAKE_FAILURE; 1456 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1457 goto fatal_err; 1458 } 1459 1460 if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len)) 1461 goto err; 1462 1463 if (!CBB_add_bytes(&server_kex, params, params_len)) 1464 goto err; 1465 1466 /* Add signature unless anonymous. */ 1467 if (!(s->s3->hs.cipher->algorithm_auth & SSL_aNULL)) { 1468 if ((pkey = ssl_get_sign_pkey(s, s->s3->hs.cipher, 1469 &md, &sigalg)) == NULL) { 1470 al = SSL_AD_DECODE_ERROR; 1471 goto fatal_err; 1472 } 1473 s->s3->hs.our_sigalg = sigalg; 1474 1475 /* Send signature algorithm. */ 1476 if (SSL_USE_SIGALGS(s)) { 1477 if (!CBB_add_u16(&server_kex, sigalg->value)) { 1478 al = SSL_AD_INTERNAL_ERROR; 1479 SSLerror(s, ERR_R_INTERNAL_ERROR); 1480 goto fatal_err; 1481 } 1482 } 1483 1484 if (!EVP_DigestSignInit(md_ctx, &pctx, md, NULL, pkey)) { 1485 SSLerror(s, ERR_R_EVP_LIB); 1486 goto err; 1487 } 1488 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1489 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1490 RSA_PKCS1_PSS_PADDING) || 1491 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1492 SSLerror(s, ERR_R_EVP_LIB); 1493 goto err; 1494 } 1495 if (!EVP_DigestSignUpdate(md_ctx, s->s3->client_random, 1496 SSL3_RANDOM_SIZE)) { 1497 SSLerror(s, ERR_R_EVP_LIB); 1498 goto err; 1499 } 1500 if (!EVP_DigestSignUpdate(md_ctx, s->s3->server_random, 1501 SSL3_RANDOM_SIZE)) { 1502 SSLerror(s, ERR_R_EVP_LIB); 1503 goto err; 1504 } 1505 if (!EVP_DigestSignUpdate(md_ctx, params, params_len)) { 1506 SSLerror(s, ERR_R_EVP_LIB); 1507 goto err; 1508 } 1509 if (!EVP_DigestSignFinal(md_ctx, NULL, &signature_len) || 1510 !signature_len) { 1511 SSLerror(s, ERR_R_EVP_LIB); 1512 goto err; 1513 } 1514 if ((signature = calloc(1, signature_len)) == NULL) { 1515 SSLerror(s, ERR_R_MALLOC_FAILURE); 1516 goto err; 1517 } 1518 if (!EVP_DigestSignFinal(md_ctx, signature, &signature_len)) { 1519 SSLerror(s, ERR_R_EVP_LIB); 1520 goto err; 1521 } 1522 1523 if (!CBB_add_u16_length_prefixed(&server_kex, 1524 &cbb_signature)) 1525 goto err; 1526 if (!CBB_add_bytes(&cbb_signature, signature, 1527 signature_len)) 1528 goto err; 1529 } 1530 1531 if (!ssl3_handshake_msg_finish(s, &cbb)) 1532 goto err; 1533 1534 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1535 } 1536 1537 EVP_MD_CTX_free(md_ctx); 1538 free(params); 1539 free(signature); 1540 1541 return (ssl3_handshake_write(s)); 1542 1543 fatal_err: 1544 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1545 err: 1546 CBB_cleanup(&cbb_params); 1547 CBB_cleanup(&cbb); 1548 EVP_MD_CTX_free(md_ctx); 1549 free(params); 1550 free(signature); 1551 1552 return (-1); 1553 } 1554 1555 int 1556 ssl3_send_certificate_request(SSL *s) 1557 { 1558 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1559 STACK_OF(X509_NAME) *sk = NULL; 1560 X509_NAME *name; 1561 int i; 1562 1563 /* 1564 * Certificate Request - RFC 5246 section 7.4.4. 1565 */ 1566 1567 memset(&cbb, 0, sizeof(cbb)); 1568 1569 if (s->s3->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1570 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, 1571 SSL3_MT_CERTIFICATE_REQUEST)) 1572 goto err; 1573 1574 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1575 goto err; 1576 if (!ssl3_get_req_cert_types(s, &cert_types)) 1577 goto err; 1578 1579 if (SSL_USE_SIGALGS(s)) { 1580 if (!CBB_add_u16_length_prefixed(&cert_request, 1581 &sigalgs)) 1582 goto err; 1583 if (!ssl_sigalgs_build(s->s3->hs.negotiated_tls_version, 1584 &sigalgs, SSL_get_security_level(s))) 1585 goto err; 1586 } 1587 1588 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) 1589 goto err; 1590 1591 sk = SSL_get_client_CA_list(s); 1592 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1593 unsigned char *name_data; 1594 size_t name_len; 1595 1596 name = sk_X509_NAME_value(sk, i); 1597 name_len = i2d_X509_NAME(name, NULL); 1598 1599 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) 1600 goto err; 1601 if (!CBB_add_space(&dn, &name_data, name_len)) 1602 goto err; 1603 if (i2d_X509_NAME(name, &name_data) != name_len) 1604 goto err; 1605 } 1606 1607 if (!ssl3_handshake_msg_finish(s, &cbb)) 1608 goto err; 1609 1610 s->s3->hs.state = SSL3_ST_SW_CERT_REQ_B; 1611 } 1612 1613 /* SSL3_ST_SW_CERT_REQ_B */ 1614 return (ssl3_handshake_write(s)); 1615 1616 err: 1617 CBB_cleanup(&cbb); 1618 1619 return (-1); 1620 } 1621 1622 static int 1623 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs) 1624 { 1625 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; 1626 unsigned char *pms = NULL; 1627 unsigned char *p; 1628 size_t pms_len = 0; 1629 EVP_PKEY *pkey = NULL; 1630 RSA *rsa = NULL; 1631 CBS enc_pms; 1632 int decrypt_len; 1633 int al = -1; 1634 1635 arc4random_buf(fakekey, sizeof(fakekey)); 1636 1637 fakekey[0] = s->s3->hs.peer_legacy_version >> 8; 1638 fakekey[1] = s->s3->hs.peer_legacy_version & 0xff; 1639 1640 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey; 1641 if (pkey == NULL || (rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 1642 al = SSL_AD_HANDSHAKE_FAILURE; 1643 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); 1644 goto fatal_err; 1645 } 1646 1647 pms_len = RSA_size(rsa); 1648 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH) 1649 goto err; 1650 if ((pms = malloc(pms_len)) == NULL) 1651 goto err; 1652 p = pms; 1653 1654 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms)) 1655 goto decode_err; 1656 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) { 1657 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1658 goto err; 1659 } 1660 1661 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms), 1662 pms, rsa, RSA_PKCS1_PADDING); 1663 1664 ERR_clear_error(); 1665 1666 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) { 1667 al = SSL_AD_DECODE_ERROR; 1668 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ 1669 } 1670 1671 if ((al == -1) && !((pms[0] == (s->s3->hs.peer_legacy_version >> 8)) && 1672 (pms[1] == (s->s3->hs.peer_legacy_version & 0xff)))) { 1673 /* 1674 * The premaster secret must contain the same version number 1675 * as the ClientHello to detect version rollback attacks 1676 * (strangely, the protocol does not offer such protection for 1677 * DH ciphersuites). 1678 * 1679 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack 1680 * (http://eprint.iacr.org/2003/052/) exploits the version 1681 * number check as a "bad version oracle" -- an alert would 1682 * reveal that the plaintext corresponding to some ciphertext 1683 * made up by the adversary is properly formatted except that 1684 * the version number is wrong. To avoid such attacks, we should 1685 * treat this just like any other decryption error. 1686 */ 1687 al = SSL_AD_DECODE_ERROR; 1688 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ 1689 } 1690 1691 if (al != -1) { 1692 /* 1693 * Some decryption failure -- use random value instead 1694 * as countermeasure against Bleichenbacher's attack 1695 * on PKCS #1 v1.5 RSA padding (see RFC 2246, 1696 * section 7.4.7.1). 1697 */ 1698 p = fakekey; 1699 } 1700 1701 if (!tls12_derive_master_secret(s, p, SSL_MAX_MASTER_KEY_LENGTH)) 1702 goto err; 1703 1704 freezero(pms, pms_len); 1705 1706 return 1; 1707 1708 decode_err: 1709 al = SSL_AD_DECODE_ERROR; 1710 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1711 fatal_err: 1712 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1713 err: 1714 freezero(pms, pms_len); 1715 1716 return 0; 1717 } 1718 1719 static int 1720 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) 1721 { 1722 uint8_t *key = NULL; 1723 size_t key_len = 0; 1724 int decode_error, invalid_key; 1725 int ret = 0; 1726 1727 if (s->s3->hs.key_share == NULL) { 1728 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1729 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1730 goto err; 1731 } 1732 1733 if (!tls_key_share_peer_public(s->s3->hs.key_share, cbs, 1734 &decode_error, &invalid_key)) { 1735 if (decode_error) { 1736 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1737 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1738 } 1739 goto err; 1740 } 1741 if (invalid_key) { 1742 SSLerror(s, SSL_R_BAD_DH_PUB_KEY_LENGTH); 1743 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1744 goto err; 1745 } 1746 1747 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1748 goto err; 1749 1750 if (!tls12_derive_master_secret(s, key, key_len)) 1751 goto err; 1752 1753 ret = 1; 1754 1755 err: 1756 freezero(key, key_len); 1757 1758 return ret; 1759 } 1760 1761 static int 1762 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) 1763 { 1764 uint8_t *key = NULL; 1765 size_t key_len = 0; 1766 int decode_error; 1767 CBS public; 1768 int ret = 0; 1769 1770 if (s->s3->hs.key_share == NULL) { 1771 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1772 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1773 goto err; 1774 } 1775 1776 if (!CBS_get_u8_length_prefixed(cbs, &public)) { 1777 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1778 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1779 goto err; 1780 } 1781 if (!tls_key_share_peer_public(s->s3->hs.key_share, &public, 1782 &decode_error, NULL)) { 1783 if (decode_error) { 1784 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1785 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1786 } 1787 goto err; 1788 } 1789 1790 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1791 goto err; 1792 1793 if (!tls12_derive_master_secret(s, key, key_len)) 1794 goto err; 1795 1796 ret = 1; 1797 1798 err: 1799 freezero(key, key_len); 1800 1801 return ret; 1802 } 1803 1804 static int 1805 ssl3_get_client_kex_gost(SSL *s, CBS *cbs) 1806 { 1807 unsigned char premaster_secret[32]; 1808 EVP_PKEY_CTX *pkey_ctx = NULL; 1809 EVP_PKEY *client_pubkey; 1810 EVP_PKEY *pkey = NULL; 1811 size_t outlen; 1812 CBS gostblob; 1813 1814 /* Get our certificate private key*/ 1815 if ((s->s3->hs.cipher->algorithm_auth & SSL_aGOST01) != 0) 1816 pkey = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 1817 1818 if ((pkey_ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) 1819 goto err; 1820 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) 1821 goto err; 1822 1823 /* 1824 * If client certificate is present and is of the same type, 1825 * maybe use it for key exchange. 1826 * Don't mind errors from EVP_PKEY_derive_set_peer, because 1827 * it is completely valid to use a client certificate for 1828 * authorization only. 1829 */ 1830 if ((client_pubkey = X509_get0_pubkey(s->session->peer_cert)) != NULL) { 1831 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pubkey) <= 0) 1832 ERR_clear_error(); 1833 } 1834 1835 /* Decrypt session key */ 1836 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) 1837 goto decode_err; 1838 if (CBS_len(cbs) != 0) 1839 goto decode_err; 1840 outlen = sizeof(premaster_secret); 1841 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 1842 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { 1843 SSLerror(s, SSL_R_DECRYPTION_FAILED); 1844 goto err; 1845 } 1846 1847 if (!tls12_derive_master_secret(s, premaster_secret, 1848 sizeof(premaster_secret))) 1849 goto err; 1850 1851 /* Check if pubkey from client certificate was used */ 1852 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 1853 2, NULL) > 0) 1854 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 1855 1856 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 1857 EVP_PKEY_CTX_free(pkey_ctx); 1858 1859 return 1; 1860 1861 decode_err: 1862 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1863 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1864 err: 1865 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 1866 EVP_PKEY_CTX_free(pkey_ctx); 1867 1868 return 0; 1869 } 1870 1871 int 1872 ssl3_get_client_key_exchange(SSL *s) 1873 { 1874 unsigned long alg_k; 1875 int al, ret; 1876 CBS cbs; 1877 1878 /* 2048 maxlen is a guess. How long a key does that permit? */ 1879 if ((ret = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 1880 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048)) <= 0) 1881 return ret; 1882 1883 if (s->internal->init_num < 0) 1884 goto err; 1885 1886 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1887 1888 alg_k = s->s3->hs.cipher->algorithm_mkey; 1889 1890 if (alg_k & SSL_kRSA) { 1891 if (!ssl3_get_client_kex_rsa(s, &cbs)) 1892 goto err; 1893 } else if (alg_k & SSL_kDHE) { 1894 if (!ssl3_get_client_kex_dhe(s, &cbs)) 1895 goto err; 1896 } else if (alg_k & SSL_kECDHE) { 1897 if (!ssl3_get_client_kex_ecdhe(s, &cbs)) 1898 goto err; 1899 } else if (alg_k & SSL_kGOST) { 1900 if (!ssl3_get_client_kex_gost(s, &cbs)) 1901 goto err; 1902 } else { 1903 al = SSL_AD_HANDSHAKE_FAILURE; 1904 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 1905 goto fatal_err; 1906 } 1907 1908 if (CBS_len(&cbs) != 0) { 1909 al = SSL_AD_DECODE_ERROR; 1910 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1911 goto fatal_err; 1912 } 1913 1914 return (1); 1915 1916 fatal_err: 1917 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1918 err: 1919 return (-1); 1920 } 1921 1922 int 1923 ssl3_get_cert_verify(SSL *s) 1924 { 1925 CBS cbs, signature; 1926 const struct ssl_sigalg *sigalg = NULL; 1927 uint16_t sigalg_value = SIGALG_NONE; 1928 EVP_PKEY *pkey; 1929 X509 *peer_cert = NULL; 1930 EVP_MD_CTX *mctx = NULL; 1931 int al, verify; 1932 const unsigned char *hdata; 1933 size_t hdatalen; 1934 int type = 0; 1935 int ret; 1936 1937 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 1938 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH)) <= 0) 1939 return ret; 1940 1941 ret = 0; 1942 1943 if (s->internal->init_num < 0) 1944 goto err; 1945 1946 if ((mctx = EVP_MD_CTX_new()) == NULL) 1947 goto err; 1948 1949 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1950 1951 peer_cert = s->session->peer_cert; 1952 pkey = X509_get0_pubkey(peer_cert); 1953 type = X509_certificate_type(peer_cert, pkey); 1954 1955 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 1956 s->s3->hs.tls12.reuse_message = 1; 1957 if (peer_cert != NULL) { 1958 al = SSL_AD_UNEXPECTED_MESSAGE; 1959 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 1960 goto fatal_err; 1961 } 1962 ret = 1; 1963 goto end; 1964 } 1965 1966 if (peer_cert == NULL) { 1967 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 1968 al = SSL_AD_UNEXPECTED_MESSAGE; 1969 goto fatal_err; 1970 } 1971 1972 if (!(type & EVP_PKT_SIGN)) { 1973 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 1974 al = SSL_AD_ILLEGAL_PARAMETER; 1975 goto fatal_err; 1976 } 1977 1978 if (s->s3->change_cipher_spec) { 1979 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 1980 al = SSL_AD_UNEXPECTED_MESSAGE; 1981 goto fatal_err; 1982 } 1983 1984 if (SSL_USE_SIGALGS(s)) { 1985 if (!CBS_get_u16(&cbs, &sigalg_value)) 1986 goto decode_err; 1987 } 1988 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1989 goto err; 1990 if (CBS_len(&cbs) != 0) { 1991 al = SSL_AD_DECODE_ERROR; 1992 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1993 goto fatal_err; 1994 } 1995 1996 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1997 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 1998 al = SSL_AD_DECODE_ERROR; 1999 goto fatal_err; 2000 } 2001 2002 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 2003 sigalg_value)) == NULL) { 2004 al = SSL_AD_DECODE_ERROR; 2005 goto fatal_err; 2006 } 2007 s->s3->hs.peer_sigalg = sigalg; 2008 2009 if (SSL_USE_SIGALGS(s)) { 2010 EVP_PKEY_CTX *pctx; 2011 2012 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2013 SSLerror(s, ERR_R_INTERNAL_ERROR); 2014 al = SSL_AD_INTERNAL_ERROR; 2015 goto fatal_err; 2016 } 2017 if (!EVP_DigestVerifyInit(mctx, &pctx, sigalg->md(), 2018 NULL, pkey)) { 2019 SSLerror(s, ERR_R_EVP_LIB); 2020 al = SSL_AD_INTERNAL_ERROR; 2021 goto fatal_err; 2022 } 2023 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2024 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 2025 RSA_PKCS1_PSS_PADDING) || 2026 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2027 al = SSL_AD_INTERNAL_ERROR; 2028 goto fatal_err; 2029 } 2030 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2031 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2032 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, 2033 NULL) <= 0) { 2034 al = SSL_AD_INTERNAL_ERROR; 2035 goto fatal_err; 2036 } 2037 if (!EVP_DigestVerifyUpdate(mctx, hdata, hdatalen)) { 2038 SSLerror(s, ERR_R_EVP_LIB); 2039 al = SSL_AD_INTERNAL_ERROR; 2040 goto fatal_err; 2041 } 2042 if (EVP_DigestVerifyFinal(mctx, CBS_data(&signature), 2043 CBS_len(&signature)) <= 0) { 2044 al = SSL_AD_DECRYPT_ERROR; 2045 SSLerror(s, SSL_R_BAD_SIGNATURE); 2046 goto fatal_err; 2047 } 2048 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) { 2049 RSA *rsa; 2050 2051 if ((rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 2052 al = SSL_AD_INTERNAL_ERROR; 2053 SSLerror(s, ERR_R_EVP_LIB); 2054 goto fatal_err; 2055 } 2056 verify = RSA_verify(NID_md5_sha1, s->s3->hs.tls12.cert_verify, 2057 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), 2058 CBS_len(&signature), rsa); 2059 if (verify < 0) { 2060 al = SSL_AD_DECRYPT_ERROR; 2061 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2062 goto fatal_err; 2063 } 2064 if (verify == 0) { 2065 al = SSL_AD_DECRYPT_ERROR; 2066 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2067 goto fatal_err; 2068 } 2069 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { 2070 EC_KEY *eckey; 2071 2072 if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL) { 2073 al = SSL_AD_INTERNAL_ERROR; 2074 SSLerror(s, ERR_R_EVP_LIB); 2075 goto fatal_err; 2076 } 2077 verify = ECDSA_verify(0, 2078 &(s->s3->hs.tls12.cert_verify[MD5_DIGEST_LENGTH]), 2079 SHA_DIGEST_LENGTH, CBS_data(&signature), 2080 CBS_len(&signature), eckey); 2081 if (verify <= 0) { 2082 al = SSL_AD_DECRYPT_ERROR; 2083 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2084 goto fatal_err; 2085 } 2086 #ifndef OPENSSL_NO_GOST 2087 } else if (EVP_PKEY_id(pkey) == NID_id_GostR3410_94 || 2088 EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) { 2089 unsigned char sigbuf[128]; 2090 unsigned int siglen = sizeof(sigbuf); 2091 EVP_PKEY_CTX *pctx; 2092 const EVP_MD *md; 2093 int nid; 2094 2095 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2096 SSLerror(s, ERR_R_INTERNAL_ERROR); 2097 al = SSL_AD_INTERNAL_ERROR; 2098 goto fatal_err; 2099 } 2100 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2101 !(md = EVP_get_digestbynid(nid))) { 2102 SSLerror(s, ERR_R_EVP_LIB); 2103 al = SSL_AD_INTERNAL_ERROR; 2104 goto fatal_err; 2105 } 2106 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 2107 SSLerror(s, ERR_R_EVP_LIB); 2108 al = SSL_AD_INTERNAL_ERROR; 2109 goto fatal_err; 2110 } 2111 if (!EVP_DigestInit_ex(mctx, md, NULL) || 2112 !EVP_DigestUpdate(mctx, hdata, hdatalen) || 2113 !EVP_DigestFinal(mctx, sigbuf, &siglen) || 2114 (EVP_PKEY_verify_init(pctx) <= 0) || 2115 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2116 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2117 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2118 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { 2119 SSLerror(s, ERR_R_EVP_LIB); 2120 al = SSL_AD_INTERNAL_ERROR; 2121 EVP_PKEY_CTX_free(pctx); 2122 goto fatal_err; 2123 } 2124 if (EVP_PKEY_verify(pctx, CBS_data(&signature), 2125 CBS_len(&signature), sigbuf, siglen) <= 0) { 2126 al = SSL_AD_DECRYPT_ERROR; 2127 SSLerror(s, SSL_R_BAD_SIGNATURE); 2128 EVP_PKEY_CTX_free(pctx); 2129 goto fatal_err; 2130 } 2131 2132 EVP_PKEY_CTX_free(pctx); 2133 #endif 2134 } else { 2135 SSLerror(s, ERR_R_INTERNAL_ERROR); 2136 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2137 goto fatal_err; 2138 } 2139 2140 ret = 1; 2141 if (0) { 2142 decode_err: 2143 al = SSL_AD_DECODE_ERROR; 2144 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2145 fatal_err: 2146 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2147 } 2148 end: 2149 tls1_transcript_free(s); 2150 err: 2151 EVP_MD_CTX_free(mctx); 2152 2153 return (ret); 2154 } 2155 2156 int 2157 ssl3_get_client_certificate(SSL *s) 2158 { 2159 CBS cbs, cert_list, cert_data; 2160 STACK_OF(X509) *certs = NULL; 2161 X509 *cert = NULL; 2162 const uint8_t *p; 2163 int al, ret; 2164 2165 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2166 -1, s->internal->max_cert_list)) <= 0) 2167 return ret; 2168 2169 ret = -1; 2170 2171 if (s->s3->hs.tls12.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2172 if ((s->verify_mode & SSL_VERIFY_PEER) && 2173 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2174 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2175 al = SSL_AD_HANDSHAKE_FAILURE; 2176 goto fatal_err; 2177 } 2178 2179 /* 2180 * If we asked for a client certificate and the client has none, 2181 * it must respond with a certificate list of length zero. 2182 */ 2183 if (s->s3->hs.tls12.cert_request != 0) { 2184 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST); 2185 al = SSL_AD_UNEXPECTED_MESSAGE; 2186 goto fatal_err; 2187 } 2188 s->s3->hs.tls12.reuse_message = 1; 2189 return (1); 2190 } 2191 2192 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 2193 al = SSL_AD_UNEXPECTED_MESSAGE; 2194 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2195 goto fatal_err; 2196 } 2197 2198 if (s->internal->init_num < 0) 2199 goto decode_err; 2200 2201 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 2202 2203 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list)) 2204 goto decode_err; 2205 if (CBS_len(&cbs) != 0) 2206 goto decode_err; 2207 2208 /* 2209 * A TLS client must send an empty certificate list, if no suitable 2210 * certificate is available (rather than omitting the Certificate 2211 * handshake message) - see RFC 5246 section 7.4.6. 2212 */ 2213 if (CBS_len(&cert_list) == 0) { 2214 if ((s->verify_mode & SSL_VERIFY_PEER) && 2215 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2216 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2217 al = SSL_AD_HANDSHAKE_FAILURE; 2218 goto fatal_err; 2219 } 2220 /* No client certificate so free transcript. */ 2221 tls1_transcript_free(s); 2222 goto done; 2223 } 2224 2225 if ((certs = sk_X509_new_null()) == NULL) { 2226 SSLerror(s, ERR_R_MALLOC_FAILURE); 2227 goto err; 2228 } 2229 2230 while (CBS_len(&cert_list) > 0) { 2231 if (!CBS_get_u24_length_prefixed(&cert_list, &cert_data)) 2232 goto decode_err; 2233 p = CBS_data(&cert_data); 2234 if ((cert = d2i_X509(NULL, &p, CBS_len(&cert_data))) == NULL) { 2235 SSLerror(s, ERR_R_ASN1_LIB); 2236 goto err; 2237 } 2238 if (p != CBS_data(&cert_data) + CBS_len(&cert_data)) 2239 goto decode_err; 2240 if (!sk_X509_push(certs, cert)) { 2241 SSLerror(s, ERR_R_MALLOC_FAILURE); 2242 goto err; 2243 } 2244 cert = NULL; 2245 } 2246 2247 if (ssl_verify_cert_chain(s, certs) <= 0) { 2248 al = ssl_verify_alarm_type(s->verify_result); 2249 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2250 goto fatal_err; 2251 } 2252 s->session->verify_result = s->verify_result; 2253 ERR_clear_error(); 2254 2255 if (!tls_process_peer_certs(s, certs)) 2256 goto err; 2257 2258 done: 2259 ret = 1; 2260 if (0) { 2261 decode_err: 2262 al = SSL_AD_DECODE_ERROR; 2263 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2264 fatal_err: 2265 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2266 } 2267 err: 2268 sk_X509_pop_free(certs, X509_free); 2269 X509_free(cert); 2270 2271 return (ret); 2272 } 2273 2274 int 2275 ssl3_send_server_certificate(SSL *s) 2276 { 2277 CBB cbb, server_cert; 2278 SSL_CERT_PKEY *cpk; 2279 2280 /* 2281 * Server Certificate - RFC 5246, section 7.4.2. 2282 */ 2283 2284 memset(&cbb, 0, sizeof(cbb)); 2285 2286 if (s->s3->hs.state == SSL3_ST_SW_CERT_A) { 2287 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { 2288 SSLerror(s, ERR_R_INTERNAL_ERROR); 2289 return (0); 2290 } 2291 2292 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, 2293 SSL3_MT_CERTIFICATE)) 2294 goto err; 2295 if (!ssl3_output_cert_chain(s, &server_cert, cpk)) 2296 goto err; 2297 if (!ssl3_handshake_msg_finish(s, &cbb)) 2298 goto err; 2299 2300 s->s3->hs.state = SSL3_ST_SW_CERT_B; 2301 } 2302 2303 /* SSL3_ST_SW_CERT_B */ 2304 return (ssl3_handshake_write(s)); 2305 2306 err: 2307 CBB_cleanup(&cbb); 2308 2309 return (0); 2310 } 2311 2312 /* send a new session ticket (not necessarily for a new session) */ 2313 int 2314 ssl3_send_newsession_ticket(SSL *s) 2315 { 2316 CBB cbb, session_ticket, ticket; 2317 SSL_CTX *tctx = s->initial_ctx; 2318 size_t enc_session_len, enc_session_max_len, hmac_len; 2319 size_t session_len = 0; 2320 unsigned char *enc_session = NULL, *session = NULL; 2321 unsigned char iv[EVP_MAX_IV_LENGTH]; 2322 unsigned char key_name[16]; 2323 unsigned char *hmac; 2324 unsigned int hlen; 2325 EVP_CIPHER_CTX *ctx = NULL; 2326 HMAC_CTX *hctx = NULL; 2327 int len; 2328 2329 /* 2330 * New Session Ticket - RFC 5077, section 3.3. 2331 */ 2332 2333 memset(&cbb, 0, sizeof(cbb)); 2334 2335 if ((ctx = EVP_CIPHER_CTX_new()) == NULL) 2336 goto err; 2337 if ((hctx = HMAC_CTX_new()) == NULL) 2338 goto err; 2339 2340 if (s->s3->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2341 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, 2342 SSL3_MT_NEWSESSION_TICKET)) 2343 goto err; 2344 2345 if (!SSL_SESSION_ticket(s->session, &session, &session_len)) 2346 goto err; 2347 if (session_len > 0xffff) 2348 goto err; 2349 2350 /* 2351 * Initialize HMAC and cipher contexts. If callback is present 2352 * it does all the work, otherwise use generated values from 2353 * parent context. 2354 */ 2355 if (tctx->internal->tlsext_ticket_key_cb != NULL) { 2356 if (tctx->internal->tlsext_ticket_key_cb(s, 2357 key_name, iv, ctx, hctx, 1) < 0) 2358 goto err; 2359 } else { 2360 arc4random_buf(iv, 16); 2361 EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, 2362 tctx->internal->tlsext_tick_aes_key, iv); 2363 HMAC_Init_ex(hctx, tctx->internal->tlsext_tick_hmac_key, 2364 16, EVP_sha256(), NULL); 2365 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); 2366 } 2367 2368 /* Encrypt the session state. */ 2369 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; 2370 if ((enc_session = calloc(1, enc_session_max_len)) == NULL) 2371 goto err; 2372 enc_session_len = 0; 2373 if (!EVP_EncryptUpdate(ctx, enc_session, &len, session, 2374 session_len)) 2375 goto err; 2376 enc_session_len += len; 2377 if (!EVP_EncryptFinal_ex(ctx, enc_session + enc_session_len, 2378 &len)) 2379 goto err; 2380 enc_session_len += len; 2381 2382 if (enc_session_len > enc_session_max_len) 2383 goto err; 2384 2385 /* Generate the HMAC. */ 2386 if (!HMAC_Update(hctx, key_name, sizeof(key_name))) 2387 goto err; 2388 if (!HMAC_Update(hctx, iv, EVP_CIPHER_CTX_iv_length(ctx))) 2389 goto err; 2390 if (!HMAC_Update(hctx, enc_session, enc_session_len)) 2391 goto err; 2392 2393 if ((hmac_len = HMAC_size(hctx)) <= 0) 2394 goto err; 2395 2396 /* 2397 * Ticket lifetime hint (advisory only): 2398 * We leave this unspecified for resumed session 2399 * (for simplicity), and guess that tickets for new 2400 * sessions will live as long as their sessions. 2401 */ 2402 if (!CBB_add_u32(&session_ticket, 2403 s->internal->hit ? 0 : s->session->timeout)) 2404 goto err; 2405 2406 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) 2407 goto err; 2408 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) 2409 goto err; 2410 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(ctx))) 2411 goto err; 2412 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) 2413 goto err; 2414 if (!CBB_add_space(&ticket, &hmac, hmac_len)) 2415 goto err; 2416 2417 if (!HMAC_Final(hctx, hmac, &hlen)) 2418 goto err; 2419 if (hlen != hmac_len) 2420 goto err; 2421 2422 if (!ssl3_handshake_msg_finish(s, &cbb)) 2423 goto err; 2424 2425 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2426 } 2427 2428 EVP_CIPHER_CTX_free(ctx); 2429 HMAC_CTX_free(hctx); 2430 freezero(session, session_len); 2431 free(enc_session); 2432 2433 /* SSL3_ST_SW_SESSION_TICKET_B */ 2434 return (ssl3_handshake_write(s)); 2435 2436 err: 2437 CBB_cleanup(&cbb); 2438 EVP_CIPHER_CTX_free(ctx); 2439 HMAC_CTX_free(hctx); 2440 freezero(session, session_len); 2441 free(enc_session); 2442 2443 return (-1); 2444 } 2445 2446 int 2447 ssl3_send_cert_status(SSL *s) 2448 { 2449 CBB cbb, certstatus, ocspresp; 2450 2451 memset(&cbb, 0, sizeof(cbb)); 2452 2453 if (s->s3->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2454 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, 2455 SSL3_MT_CERTIFICATE_STATUS)) 2456 goto err; 2457 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2458 goto err; 2459 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2460 goto err; 2461 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, 2462 s->internal->tlsext_ocsp_resp_len)) 2463 goto err; 2464 if (!ssl3_handshake_msg_finish(s, &cbb)) 2465 goto err; 2466 2467 s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2468 } 2469 2470 /* SSL3_ST_SW_CERT_STATUS_B */ 2471 return (ssl3_handshake_write(s)); 2472 2473 err: 2474 CBB_cleanup(&cbb); 2475 2476 return (-1); 2477 } 2478