1 /* $OpenBSD: ssl_srvr.c,v 1.142 2022/06/07 17:14:17 tb Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <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 (!ssl3_setup_init_buffer(s)) { 227 ret = -1; 228 goto end; 229 } 230 if (!ssl3_setup_buffers(s)) { 231 ret = -1; 232 goto end; 233 } 234 235 s->internal->init_num = 0; 236 237 if (s->s3->hs.state != SSL_ST_RENEGOTIATE) { 238 /* 239 * Ok, we now need to push on a buffering BIO 240 * so that the output is sent in a way that 241 * TCP likes :-) 242 */ 243 if (!ssl_init_wbio_buffer(s, 1)) { 244 ret = -1; 245 goto end; 246 } 247 248 if (!tls1_transcript_init(s)) { 249 ret = -1; 250 goto end; 251 } 252 253 s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_A; 254 s->ctx->internal->stats.sess_accept++; 255 } else if (!SSL_is_dtls(s) && !s->s3->send_connection_binding) { 256 /* 257 * Server attempting to renegotiate with 258 * client that doesn't support secure 259 * renegotiation. 260 */ 261 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 262 ssl3_send_alert(s, SSL3_AL_FATAL, 263 SSL_AD_HANDSHAKE_FAILURE); 264 ret = -1; 265 goto end; 266 } else { 267 /* 268 * s->s3->hs.state == SSL_ST_RENEGOTIATE, 269 * we will just send a HelloRequest. 270 */ 271 s->ctx->internal->stats.sess_accept_renegotiate++; 272 s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_A; 273 } 274 break; 275 276 case SSL3_ST_SW_HELLO_REQ_A: 277 case SSL3_ST_SW_HELLO_REQ_B: 278 s->internal->shutdown = 0; 279 if (SSL_is_dtls(s)) { 280 dtls1_clear_record_buffer(s); 281 dtls1_start_timer(s); 282 } 283 ret = ssl3_send_hello_request(s); 284 if (ret <= 0) 285 goto end; 286 if (SSL_is_dtls(s)) 287 s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A; 288 else 289 s->s3->hs.tls12.next_state = SSL3_ST_SW_HELLO_REQ_C; 290 s->s3->hs.state = SSL3_ST_SW_FLUSH; 291 s->internal->init_num = 0; 292 293 if (SSL_is_dtls(s)) { 294 if (!tls1_transcript_init(s)) { 295 ret = -1; 296 goto end; 297 } 298 } 299 break; 300 301 case SSL3_ST_SW_HELLO_REQ_C: 302 s->s3->hs.state = SSL_ST_OK; 303 break; 304 305 case SSL3_ST_SR_CLNT_HELLO_A: 306 case SSL3_ST_SR_CLNT_HELLO_B: 307 case SSL3_ST_SR_CLNT_HELLO_C: 308 s->internal->shutdown = 0; 309 if (SSL_is_dtls(s)) { 310 ret = ssl3_get_client_hello(s); 311 if (ret <= 0) 312 goto end; 313 dtls1_stop_timer(s); 314 315 if (ret == 1 && 316 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 317 s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 318 else 319 s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 320 321 s->internal->init_num = 0; 322 323 /* 324 * Reflect ClientHello sequence to remain 325 * stateless while listening. 326 */ 327 if (listen) { 328 tls12_record_layer_reflect_seq_num( 329 s->internal->rl); 330 } 331 332 /* If we're just listening, stop here */ 333 if (listen && s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 334 ret = 2; 335 s->d1->listen = 0; 336 /* 337 * Set expected sequence numbers to 338 * continue the handshake. 339 */ 340 s->d1->handshake_read_seq = 2; 341 s->d1->handshake_write_seq = 1; 342 s->d1->next_handshake_write_seq = 1; 343 goto end; 344 } 345 } else { 346 if (s->internal->rwstate != SSL_X509_LOOKUP) { 347 ret = ssl3_get_client_hello(s); 348 if (ret <= 0) 349 goto end; 350 } 351 352 s->internal->renegotiate = 2; 353 s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 354 s->internal->init_num = 0; 355 } 356 break; 357 358 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 359 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 360 ret = ssl3_send_dtls_hello_verify_request(s); 361 if (ret <= 0) 362 goto end; 363 s->s3->hs.state = SSL3_ST_SW_FLUSH; 364 s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A; 365 366 /* HelloVerifyRequest resets Finished MAC. */ 367 tls1_transcript_reset(s); 368 break; 369 370 case SSL3_ST_SW_SRVR_HELLO_A: 371 case SSL3_ST_SW_SRVR_HELLO_B: 372 if (SSL_is_dtls(s)) { 373 s->internal->renegotiate = 2; 374 dtls1_start_timer(s); 375 } 376 ret = ssl3_send_server_hello(s); 377 if (ret <= 0) 378 goto end; 379 if (s->internal->hit) { 380 if (s->internal->tlsext_ticket_expected) 381 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 382 else 383 s->s3->hs.state = SSL3_ST_SW_CHANGE_A; 384 } else { 385 s->s3->hs.state = SSL3_ST_SW_CERT_A; 386 } 387 s->internal->init_num = 0; 388 break; 389 390 case SSL3_ST_SW_CERT_A: 391 case SSL3_ST_SW_CERT_B: 392 /* Check if it is anon DH or anon ECDH. */ 393 if (!(s->s3->hs.cipher->algorithm_auth & 394 SSL_aNULL)) { 395 if (SSL_is_dtls(s)) 396 dtls1_start_timer(s); 397 ret = ssl3_send_server_certificate(s); 398 if (ret <= 0) 399 goto end; 400 if (s->internal->tlsext_status_expected) 401 s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_A; 402 else 403 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A; 404 } else { 405 skip = 1; 406 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A; 407 } 408 s->internal->init_num = 0; 409 break; 410 411 case SSL3_ST_SW_KEY_EXCH_A: 412 case SSL3_ST_SW_KEY_EXCH_B: 413 alg_k = s->s3->hs.cipher->algorithm_mkey; 414 415 /* 416 * Only send if using a DH key exchange. 417 * 418 * For ECC ciphersuites, we send a ServerKeyExchange 419 * message only if the cipher suite is ECDHE. In other 420 * cases, the server certificate contains the server's 421 * public key for key exchange. 422 */ 423 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 424 if (SSL_is_dtls(s)) 425 dtls1_start_timer(s); 426 ret = ssl3_send_server_key_exchange(s); 427 if (ret <= 0) 428 goto end; 429 } else 430 skip = 1; 431 432 s->s3->hs.state = SSL3_ST_SW_CERT_REQ_A; 433 s->internal->init_num = 0; 434 break; 435 436 case SSL3_ST_SW_CERT_REQ_A: 437 case SSL3_ST_SW_CERT_REQ_B: 438 /* 439 * Determine whether or not we need to request a 440 * certificate. 441 * 442 * Do not request a certificate if: 443 * 444 * - We did not ask for it (SSL_VERIFY_PEER is unset). 445 * 446 * - SSL_VERIFY_CLIENT_ONCE is set and we are 447 * renegotiating. 448 * 449 * - We are using an anonymous ciphersuites 450 * (see section "Certificate request" in SSL 3 drafts 451 * and in RFC 2246) ... except when the application 452 * insists on verification (against the specs, but 453 * s3_clnt.c accepts this for SSL 3). 454 */ 455 if (!(s->verify_mode & SSL_VERIFY_PEER) || 456 ((s->session->peer_cert != NULL) && 457 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 458 ((s->s3->hs.cipher->algorithm_auth & 459 SSL_aNULL) && !(s->verify_mode & 460 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) { 461 /* No cert request. */ 462 skip = 1; 463 s->s3->hs.tls12.cert_request = 0; 464 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A; 465 466 if (!SSL_is_dtls(s)) 467 tls1_transcript_free(s); 468 } else { 469 s->s3->hs.tls12.cert_request = 1; 470 if (SSL_is_dtls(s)) 471 dtls1_start_timer(s); 472 ret = ssl3_send_certificate_request(s); 473 if (ret <= 0) 474 goto end; 475 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A; 476 s->internal->init_num = 0; 477 } 478 break; 479 480 case SSL3_ST_SW_SRVR_DONE_A: 481 case SSL3_ST_SW_SRVR_DONE_B: 482 if (SSL_is_dtls(s)) 483 dtls1_start_timer(s); 484 ret = ssl3_send_server_done(s); 485 if (ret <= 0) 486 goto end; 487 s->s3->hs.tls12.next_state = SSL3_ST_SR_CERT_A; 488 s->s3->hs.state = SSL3_ST_SW_FLUSH; 489 s->internal->init_num = 0; 490 break; 491 492 case SSL3_ST_SW_FLUSH: 493 /* 494 * This code originally checked to see if 495 * any data was pending using BIO_CTRL_INFO 496 * and then flushed. This caused problems 497 * as documented in PR#1939. The proposed 498 * fix doesn't completely resolve this issue 499 * as buggy implementations of BIO_CTRL_PENDING 500 * still exist. So instead we just flush 501 * unconditionally. 502 */ 503 s->internal->rwstate = SSL_WRITING; 504 if (BIO_flush(s->wbio) <= 0) { 505 if (SSL_is_dtls(s)) { 506 /* If the write error was fatal, stop trying. */ 507 if (!BIO_should_retry(s->wbio)) { 508 s->internal->rwstate = SSL_NOTHING; 509 s->s3->hs.state = s->s3->hs.tls12.next_state; 510 } 511 } 512 ret = -1; 513 goto end; 514 } 515 s->internal->rwstate = SSL_NOTHING; 516 s->s3->hs.state = s->s3->hs.tls12.next_state; 517 break; 518 519 case SSL3_ST_SR_CERT_A: 520 case SSL3_ST_SR_CERT_B: 521 if (s->s3->hs.tls12.cert_request) { 522 ret = ssl3_get_client_certificate(s); 523 if (ret <= 0) 524 goto end; 525 } 526 s->internal->init_num = 0; 527 s->s3->hs.state = SSL3_ST_SR_KEY_EXCH_A; 528 break; 529 530 case SSL3_ST_SR_KEY_EXCH_A: 531 case SSL3_ST_SR_KEY_EXCH_B: 532 ret = ssl3_get_client_key_exchange(s); 533 if (ret <= 0) 534 goto end; 535 536 if (SSL_is_dtls(s)) { 537 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A; 538 s->internal->init_num = 0; 539 } 540 541 alg_k = s->s3->hs.cipher->algorithm_mkey; 542 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 543 /* 544 * A GOST client may use the key from its 545 * certificate for key exchange, in which case 546 * the CertificateVerify message is not sent. 547 */ 548 s->s3->hs.state = SSL3_ST_SR_FINISHED_A; 549 s->internal->init_num = 0; 550 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) { 551 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A; 552 s->internal->init_num = 0; 553 if (!s->session->peer_cert) 554 break; 555 /* 556 * Freeze the transcript for use during client 557 * certificate verification. 558 */ 559 tls1_transcript_freeze(s); 560 } else { 561 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A; 562 s->internal->init_num = 0; 563 564 tls1_transcript_free(s); 565 566 /* 567 * We need to get hashes here so if there is 568 * a client cert, it can be verified. 569 */ 570 if (!tls1_transcript_hash_value(s, 571 s->s3->hs.tls12.cert_verify, 572 sizeof(s->s3->hs.tls12.cert_verify), 573 NULL)) { 574 ret = -1; 575 goto end; 576 } 577 } 578 break; 579 580 case SSL3_ST_SR_CERT_VRFY_A: 581 case SSL3_ST_SR_CERT_VRFY_B: 582 if (SSL_is_dtls(s)) 583 s->d1->change_cipher_spec_ok = 1; 584 else 585 s->s3->flags |= SSL3_FLAGS_CCS_OK; 586 587 /* we should decide if we expected this one */ 588 ret = ssl3_get_cert_verify(s); 589 if (ret <= 0) 590 goto end; 591 s->s3->hs.state = SSL3_ST_SR_FINISHED_A; 592 s->internal->init_num = 0; 593 break; 594 595 case SSL3_ST_SR_FINISHED_A: 596 case SSL3_ST_SR_FINISHED_B: 597 if (SSL_is_dtls(s)) 598 s->d1->change_cipher_spec_ok = 1; 599 else 600 s->s3->flags |= SSL3_FLAGS_CCS_OK; 601 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 602 SSL3_ST_SR_FINISHED_B); 603 if (ret <= 0) 604 goto end; 605 if (SSL_is_dtls(s)) 606 dtls1_stop_timer(s); 607 if (s->internal->hit) 608 s->s3->hs.state = SSL_ST_OK; 609 else if (s->internal->tlsext_ticket_expected) 610 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 611 else 612 s->s3->hs.state = SSL3_ST_SW_CHANGE_A; 613 s->internal->init_num = 0; 614 break; 615 616 case SSL3_ST_SW_SESSION_TICKET_A: 617 case SSL3_ST_SW_SESSION_TICKET_B: 618 ret = ssl3_send_newsession_ticket(s); 619 if (ret <= 0) 620 goto end; 621 s->s3->hs.state = SSL3_ST_SW_CHANGE_A; 622 s->internal->init_num = 0; 623 break; 624 625 case SSL3_ST_SW_CERT_STATUS_A: 626 case SSL3_ST_SW_CERT_STATUS_B: 627 ret = ssl3_send_cert_status(s); 628 if (ret <= 0) 629 goto end; 630 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A; 631 s->internal->init_num = 0; 632 break; 633 634 case SSL3_ST_SW_CHANGE_A: 635 case SSL3_ST_SW_CHANGE_B: 636 ret = ssl3_send_change_cipher_spec(s, 637 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B); 638 if (ret <= 0) 639 goto end; 640 s->s3->hs.state = SSL3_ST_SW_FINISHED_A; 641 s->internal->init_num = 0; 642 s->session->cipher = s->s3->hs.cipher; 643 644 if (!tls1_setup_key_block(s)) { 645 ret = -1; 646 goto end; 647 } 648 if (!tls1_change_write_cipher_state(s)) { 649 ret = -1; 650 goto end; 651 } 652 break; 653 654 case SSL3_ST_SW_FINISHED_A: 655 case SSL3_ST_SW_FINISHED_B: 656 ret = ssl3_send_finished(s, SSL3_ST_SW_FINISHED_A, 657 SSL3_ST_SW_FINISHED_B); 658 if (ret <= 0) 659 goto end; 660 s->s3->hs.state = SSL3_ST_SW_FLUSH; 661 if (s->internal->hit) { 662 s->s3->hs.tls12.next_state = SSL3_ST_SR_FINISHED_A; 663 tls1_transcript_free(s); 664 } else 665 s->s3->hs.tls12.next_state = SSL_ST_OK; 666 s->internal->init_num = 0; 667 break; 668 669 case SSL_ST_OK: 670 /* clean a few things up */ 671 tls1_cleanup_key_block(s); 672 673 if (s->s3->handshake_transcript != NULL) { 674 SSLerror(s, ERR_R_INTERNAL_ERROR); 675 ret = -1; 676 goto end; 677 } 678 679 if (!SSL_is_dtls(s)) 680 ssl3_release_init_buffer(s); 681 682 /* remove buffering on output */ 683 ssl_free_wbio_buffer(s); 684 685 s->internal->init_num = 0; 686 687 /* Skipped if we just sent a HelloRequest. */ 688 if (s->internal->renegotiate == 2) { 689 s->internal->renegotiate = 0; 690 s->internal->new_session = 0; 691 692 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 693 694 s->ctx->internal->stats.sess_accept_good++; 695 /* s->server=1; */ 696 s->internal->handshake_func = ssl3_accept; 697 698 ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1); 699 } 700 701 ret = 1; 702 703 if (SSL_is_dtls(s)) { 704 /* Done handshaking, next message is client hello. */ 705 s->d1->handshake_read_seq = 0; 706 /* Next message is server hello. */ 707 s->d1->handshake_write_seq = 0; 708 s->d1->next_handshake_write_seq = 0; 709 } 710 goto end; 711 /* break; */ 712 713 default: 714 SSLerror(s, SSL_R_UNKNOWN_STATE); 715 ret = -1; 716 goto end; 717 /* break; */ 718 } 719 720 if (!s->s3->hs.tls12.reuse_message && !skip) { 721 if (s->internal->debug) { 722 if ((ret = BIO_flush(s->wbio)) <= 0) 723 goto end; 724 } 725 726 727 if (s->s3->hs.state != state) { 728 new_state = s->s3->hs.state; 729 s->s3->hs.state = state; 730 ssl_info_callback(s, SSL_CB_ACCEPT_LOOP, 1); 731 s->s3->hs.state = new_state; 732 } 733 } 734 skip = 0; 735 } 736 end: 737 /* BIO_flush(s->wbio); */ 738 s->internal->in_handshake--; 739 ssl_info_callback(s, SSL_CB_ACCEPT_EXIT, ret); 740 741 return (ret); 742 } 743 744 int 745 ssl3_send_hello_request(SSL *s) 746 { 747 CBB cbb, hello; 748 749 memset(&cbb, 0, sizeof(cbb)); 750 751 if (s->s3->hs.state == SSL3_ST_SW_HELLO_REQ_A) { 752 if (!ssl3_handshake_msg_start(s, &cbb, &hello, 753 SSL3_MT_HELLO_REQUEST)) 754 goto err; 755 if (!ssl3_handshake_msg_finish(s, &cbb)) 756 goto err; 757 758 s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_B; 759 } 760 761 /* SSL3_ST_SW_HELLO_REQ_B */ 762 return (ssl3_handshake_write(s)); 763 764 err: 765 CBB_cleanup(&cbb); 766 767 return (-1); 768 } 769 770 int 771 ssl3_get_client_hello(SSL *s) 772 { 773 CBS cbs, client_random, session_id, cookie, cipher_suites; 774 CBS compression_methods; 775 uint16_t client_version; 776 uint8_t comp_method; 777 int comp_null; 778 int i, j, al, ret, cookie_valid = 0; 779 unsigned long id; 780 SSL_CIPHER *c; 781 STACK_OF(SSL_CIPHER) *ciphers = NULL; 782 unsigned long alg_k; 783 const SSL_METHOD *method; 784 uint16_t shared_version; 785 786 /* 787 * We do this so that we will respond with our native type. 788 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, 789 * This down switching should be handled by a different method. 790 * If we are SSLv3, we will respond with SSLv3, even if prompted with 791 * TLSv1. 792 */ 793 if (s->s3->hs.state == SSL3_ST_SR_CLNT_HELLO_A) 794 s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_B; 795 796 s->internal->first_packet = 1; 797 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, 798 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, 799 SSL3_RT_MAX_PLAIN_LENGTH)) <= 0) 800 return ret; 801 s->internal->first_packet = 0; 802 803 ret = -1; 804 805 if (s->internal->init_num < 0) 806 goto err; 807 808 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 809 810 /* Parse client hello up until the extensions (if any). */ 811 if (!CBS_get_u16(&cbs, &client_version)) 812 goto decode_err; 813 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE)) 814 goto decode_err; 815 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 816 goto decode_err; 817 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 818 al = SSL_AD_ILLEGAL_PARAMETER; 819 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 820 goto fatal_err; 821 } 822 if (SSL_is_dtls(s)) { 823 if (!CBS_get_u8_length_prefixed(&cbs, &cookie)) 824 goto decode_err; 825 } 826 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites)) 827 goto decode_err; 828 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods)) 829 goto decode_err; 830 831 /* 832 * Use version from inside client hello, not from record header. 833 * (may differ: see RFC 2246, Appendix E, second paragraph) 834 */ 835 if (!ssl_max_shared_version(s, client_version, &shared_version)) { 836 if ((client_version >> 8) == SSL3_VERSION_MAJOR && 837 !tls12_record_layer_write_protected(s->internal->rl)) { 838 /* 839 * Similar to ssl3_get_record, send alert using remote 840 * version number. 841 */ 842 s->version = client_version; 843 } 844 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER); 845 al = SSL_AD_PROTOCOL_VERSION; 846 goto fatal_err; 847 } 848 s->s3->hs.peer_legacy_version = client_version; 849 s->version = shared_version; 850 851 s->s3->hs.negotiated_tls_version = ssl_tls_version(shared_version); 852 if (s->s3->hs.negotiated_tls_version == 0) { 853 SSLerror(s, ERR_R_INTERNAL_ERROR); 854 goto err; 855 } 856 857 if ((method = ssl_get_method(shared_version)) == NULL) { 858 SSLerror(s, ERR_R_INTERNAL_ERROR); 859 goto err; 860 } 861 s->method = method; 862 863 /* 864 * If we require cookies (DTLS) and this ClientHello does not contain 865 * one, just return since we do not want to allocate any memory yet. 866 * So check cookie length... 867 */ 868 if (SSL_is_dtls(s)) { 869 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 870 if (CBS_len(&cookie) == 0) 871 return (1); 872 } 873 } 874 875 if (!CBS_write_bytes(&client_random, s->s3->client_random, 876 sizeof(s->s3->client_random), NULL)) 877 goto err; 878 879 s->internal->hit = 0; 880 881 /* 882 * Versions before 0.9.7 always allow clients to resume sessions in 883 * renegotiation. 0.9.7 and later allow this by default, but optionally 884 * ignore resumption requests with flag 885 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag 886 * rather than a change to default behavior so that applications 887 * relying on this for security won't even compile against older 888 * library versions). 889 * 890 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() 891 * to request renegotiation but not a new session (s->internal->new_session 892 * remains unset): for servers, this essentially just means that the 893 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be 894 * ignored. 895 */ 896 if ((s->internal->new_session && (s->internal->options & 897 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { 898 if (!ssl_get_new_session(s, 1)) 899 goto err; 900 } else { 901 CBS ext_block; 902 903 CBS_dup(&cbs, &ext_block); 904 905 i = ssl_get_prev_session(s, &session_id, &ext_block, &al); 906 if (i == 1) { /* previous session */ 907 s->internal->hit = 1; 908 } else if (i == -1) 909 goto fatal_err; 910 else { 911 /* i == 0 */ 912 if (!ssl_get_new_session(s, 1)) 913 goto err; 914 } 915 } 916 917 if (SSL_is_dtls(s)) { 918 /* 919 * The ClientHello may contain a cookie even if the HelloVerify 920 * message has not been sent - make sure that it does not cause 921 * an overflow. 922 */ 923 if (CBS_len(&cookie) > sizeof(s->d1->rcvd_cookie)) { 924 al = SSL_AD_DECODE_ERROR; 925 SSLerror(s, SSL_R_COOKIE_MISMATCH); 926 goto fatal_err; 927 } 928 929 /* Verify the cookie if appropriate option is set. */ 930 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && 931 CBS_len(&cookie) > 0) { 932 size_t cookie_len; 933 934 /* XXX - rcvd_cookie seems to only be used here... */ 935 if (!CBS_write_bytes(&cookie, s->d1->rcvd_cookie, 936 sizeof(s->d1->rcvd_cookie), &cookie_len)) 937 goto err; 938 939 if (s->ctx->internal->app_verify_cookie_cb != NULL) { 940 if (s->ctx->internal->app_verify_cookie_cb(s, 941 s->d1->rcvd_cookie, cookie_len) == 0) { 942 al = SSL_AD_HANDSHAKE_FAILURE; 943 SSLerror(s, SSL_R_COOKIE_MISMATCH); 944 goto fatal_err; 945 } 946 /* else cookie verification succeeded */ 947 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */ 948 } else if (timingsafe_memcmp(s->d1->rcvd_cookie, 949 s->d1->cookie, s->d1->cookie_len) != 0) { 950 /* default verification */ 951 al = SSL_AD_HANDSHAKE_FAILURE; 952 SSLerror(s, SSL_R_COOKIE_MISMATCH); 953 goto fatal_err; 954 } 955 cookie_valid = 1; 956 } 957 } 958 959 /* XXX - This logic seems wrong... */ 960 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) { 961 /* we need a cipher if we are not resuming a session */ 962 al = SSL_AD_ILLEGAL_PARAMETER; 963 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED); 964 goto fatal_err; 965 } 966 967 if (CBS_len(&cipher_suites) > 0) { 968 if ((ciphers = ssl_bytes_to_cipher_list(s, 969 &cipher_suites)) == NULL) 970 goto err; 971 } 972 973 /* If it is a hit, check that the cipher is in the list */ 974 /* XXX - CBS_len(&cipher_suites) will always be zero here... */ 975 if (s->internal->hit && CBS_len(&cipher_suites) > 0) { 976 j = 0; 977 id = s->session->cipher->id; 978 979 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 980 c = sk_SSL_CIPHER_value(ciphers, i); 981 if (c->id == id) { 982 j = 1; 983 break; 984 } 985 } 986 if (j == 0) { 987 /* 988 * We need to have the cipher in the cipher 989 * list if we are asked to reuse it 990 */ 991 al = SSL_AD_ILLEGAL_PARAMETER; 992 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING); 993 goto fatal_err; 994 } 995 } 996 997 comp_null = 0; 998 while (CBS_len(&compression_methods) > 0) { 999 if (!CBS_get_u8(&compression_methods, &comp_method)) 1000 goto decode_err; 1001 if (comp_method == 0) 1002 comp_null = 1; 1003 } 1004 if (comp_null == 0) { 1005 al = SSL_AD_DECODE_ERROR; 1006 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED); 1007 goto fatal_err; 1008 } 1009 1010 if (!tlsext_server_parse(s, SSL_TLSEXT_MSG_CH, &cbs, &al)) { 1011 SSLerror(s, SSL_R_PARSE_TLSEXT); 1012 goto fatal_err; 1013 } 1014 1015 if (CBS_len(&cbs) != 0) 1016 goto decode_err; 1017 1018 if (!s->s3->renegotiate_seen && s->internal->renegotiate) { 1019 al = SSL_AD_HANDSHAKE_FAILURE; 1020 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1021 goto fatal_err; 1022 } 1023 1024 if (ssl_check_clienthello_tlsext_early(s) <= 0) { 1025 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1026 goto err; 1027 } 1028 1029 /* 1030 * Check if we want to use external pre-shared secret for this 1031 * handshake for not reused session only. We need to generate 1032 * server_random before calling tls_session_secret_cb in order to allow 1033 * SessionTicket processing to use it in key derivation. 1034 */ 1035 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE); 1036 1037 if (s->s3->hs.our_max_tls_version >= TLS1_2_VERSION && 1038 s->s3->hs.negotiated_tls_version < s->s3->hs.our_max_tls_version) { 1039 /* 1040 * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3 1041 * we must set the last 8 bytes of the server random to magical 1042 * values to indicate we meant to downgrade. For TLS 1.2 it is 1043 * recommended that we do the same. 1044 */ 1045 size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12); 1046 uint8_t *magic = &s->s3->server_random[index]; 1047 if (s->s3->hs.negotiated_tls_version == TLS1_2_VERSION) { 1048 /* Indicate we chose to downgrade to 1.2. */ 1049 memcpy(magic, tls13_downgrade_12, 1050 sizeof(tls13_downgrade_12)); 1051 } else { 1052 /* Indicate we chose to downgrade to 1.1 or lower */ 1053 memcpy(magic, tls13_downgrade_11, 1054 sizeof(tls13_downgrade_11)); 1055 } 1056 } 1057 1058 if (!s->internal->hit && s->internal->tls_session_secret_cb != NULL) { 1059 SSL_CIPHER *pref_cipher = NULL; 1060 int master_key_length = sizeof(s->session->master_key); 1061 1062 if (!s->internal->tls_session_secret_cb(s, 1063 s->session->master_key, &master_key_length, ciphers, 1064 &pref_cipher, s->internal->tls_session_secret_cb_arg)) { 1065 SSLerror(s, ERR_R_INTERNAL_ERROR); 1066 goto err; 1067 } 1068 if (master_key_length <= 0) { 1069 SSLerror(s, ERR_R_INTERNAL_ERROR); 1070 goto err; 1071 } 1072 s->session->master_key_length = master_key_length; 1073 1074 s->internal->hit = 1; 1075 s->session->verify_result = X509_V_OK; 1076 1077 s->session->ciphers = ciphers; 1078 ciphers = NULL; 1079 1080 /* Check if some cipher was preferred by the callback. */ 1081 if (pref_cipher == NULL) 1082 pref_cipher = ssl3_choose_cipher(s, s->session->ciphers, 1083 SSL_get_ciphers(s)); 1084 if (pref_cipher == NULL) { 1085 al = SSL_AD_HANDSHAKE_FAILURE; 1086 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1087 goto fatal_err; 1088 } 1089 s->session->cipher = pref_cipher; 1090 1091 sk_SSL_CIPHER_free(s->cipher_list); 1092 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); 1093 } 1094 1095 /* 1096 * Given s->session->ciphers and SSL_get_ciphers, we must 1097 * pick a cipher 1098 */ 1099 1100 if (!s->internal->hit) { 1101 sk_SSL_CIPHER_free(s->session->ciphers); 1102 s->session->ciphers = ciphers; 1103 if (ciphers == NULL) { 1104 al = SSL_AD_ILLEGAL_PARAMETER; 1105 SSLerror(s, SSL_R_NO_CIPHERS_PASSED); 1106 goto fatal_err; 1107 } 1108 ciphers = NULL; 1109 c = ssl3_choose_cipher(s, s->session->ciphers, 1110 SSL_get_ciphers(s)); 1111 1112 if (c == NULL) { 1113 al = SSL_AD_HANDSHAKE_FAILURE; 1114 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1115 goto fatal_err; 1116 } 1117 s->s3->hs.cipher = c; 1118 } else { 1119 s->s3->hs.cipher = s->session->cipher; 1120 } 1121 1122 if (!tls1_transcript_hash_init(s)) 1123 goto err; 1124 1125 alg_k = s->s3->hs.cipher->algorithm_mkey; 1126 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) || 1127 !(s->verify_mode & SSL_VERIFY_PEER)) 1128 tls1_transcript_free(s); 1129 1130 /* 1131 * We now have the following setup. 1132 * client_random 1133 * cipher_list - our prefered list of ciphers 1134 * ciphers - the clients prefered list of ciphers 1135 * compression - basically ignored right now 1136 * ssl version is set - sslv3 1137 * s->session - The ssl session has been setup. 1138 * s->internal->hit - session reuse flag 1139 * s->hs.cipher - the new cipher to use. 1140 */ 1141 1142 /* Handles TLS extensions that we couldn't check earlier */ 1143 if (ssl_check_clienthello_tlsext_late(s) <= 0) { 1144 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1145 goto err; 1146 } 1147 1148 ret = cookie_valid ? 2 : 1; 1149 1150 if (0) { 1151 decode_err: 1152 al = SSL_AD_DECODE_ERROR; 1153 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1154 fatal_err: 1155 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1156 } 1157 err: 1158 sk_SSL_CIPHER_free(ciphers); 1159 1160 return (ret); 1161 } 1162 1163 int 1164 ssl3_send_dtls_hello_verify_request(SSL *s) 1165 { 1166 CBB cbb, verify, cookie; 1167 1168 memset(&cbb, 0, sizeof(cbb)); 1169 1170 if (s->s3->hs.state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 1171 if (s->ctx->internal->app_gen_cookie_cb == NULL || 1172 s->ctx->internal->app_gen_cookie_cb(s, s->d1->cookie, 1173 &(s->d1->cookie_len)) == 0) { 1174 SSLerror(s, ERR_R_INTERNAL_ERROR); 1175 return 0; 1176 } 1177 1178 /* 1179 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should 1180 * always contain DTLSv1.0 regardless of the version that is 1181 * going to be negotiated. 1182 */ 1183 if (!ssl3_handshake_msg_start(s, &cbb, &verify, 1184 DTLS1_MT_HELLO_VERIFY_REQUEST)) 1185 goto err; 1186 if (!CBB_add_u16(&verify, DTLS1_VERSION)) 1187 goto err; 1188 if (!CBB_add_u8_length_prefixed(&verify, &cookie)) 1189 goto err; 1190 if (!CBB_add_bytes(&cookie, s->d1->cookie, s->d1->cookie_len)) 1191 goto err; 1192 if (!ssl3_handshake_msg_finish(s, &cbb)) 1193 goto err; 1194 1195 s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 1196 } 1197 1198 /* s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 1199 return (ssl3_handshake_write(s)); 1200 1201 err: 1202 CBB_cleanup(&cbb); 1203 1204 return (-1); 1205 } 1206 1207 int 1208 ssl3_send_server_hello(SSL *s) 1209 { 1210 CBB cbb, server_hello, session_id; 1211 size_t sl; 1212 1213 memset(&cbb, 0, sizeof(cbb)); 1214 1215 if (s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 1216 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello, 1217 SSL3_MT_SERVER_HELLO)) 1218 goto err; 1219 1220 if (!CBB_add_u16(&server_hello, s->version)) 1221 goto err; 1222 if (!CBB_add_bytes(&server_hello, s->s3->server_random, 1223 sizeof(s->s3->server_random))) 1224 goto err; 1225 1226 /* 1227 * There are several cases for the session ID to send 1228 * back in the server hello: 1229 * 1230 * - For session reuse from the session cache, 1231 * we send back the old session ID. 1232 * - If stateless session reuse (using a session ticket) 1233 * is successful, we send back the client's "session ID" 1234 * (which doesn't actually identify the session). 1235 * - If it is a new session, we send back the new 1236 * session ID. 1237 * - However, if we want the new session to be single-use, 1238 * we send back a 0-length session ID. 1239 * 1240 * s->internal->hit is non-zero in either case of session reuse, 1241 * so the following won't overwrite an ID that we're supposed 1242 * to send back. 1243 */ 1244 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER) 1245 && !s->internal->hit) 1246 s->session->session_id_length = 0; 1247 1248 sl = s->session->session_id_length; 1249 if (sl > sizeof(s->session->session_id)) { 1250 SSLerror(s, ERR_R_INTERNAL_ERROR); 1251 goto err; 1252 } 1253 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) 1254 goto err; 1255 if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) 1256 goto err; 1257 1258 /* Cipher suite. */ 1259 if (!CBB_add_u16(&server_hello, 1260 ssl3_cipher_get_value(s->s3->hs.cipher))) 1261 goto err; 1262 1263 /* Compression method (null). */ 1264 if (!CBB_add_u8(&server_hello, 0)) 1265 goto err; 1266 1267 /* TLS extensions */ 1268 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) { 1269 SSLerror(s, ERR_R_INTERNAL_ERROR); 1270 goto err; 1271 } 1272 1273 if (!ssl3_handshake_msg_finish(s, &cbb)) 1274 goto err; 1275 } 1276 1277 /* SSL3_ST_SW_SRVR_HELLO_B */ 1278 return (ssl3_handshake_write(s)); 1279 1280 err: 1281 CBB_cleanup(&cbb); 1282 1283 return (-1); 1284 } 1285 1286 int 1287 ssl3_send_server_done(SSL *s) 1288 { 1289 CBB cbb, done; 1290 1291 memset(&cbb, 0, sizeof(cbb)); 1292 1293 if (s->s3->hs.state == SSL3_ST_SW_SRVR_DONE_A) { 1294 if (!ssl3_handshake_msg_start(s, &cbb, &done, 1295 SSL3_MT_SERVER_DONE)) 1296 goto err; 1297 if (!ssl3_handshake_msg_finish(s, &cbb)) 1298 goto err; 1299 1300 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_B; 1301 } 1302 1303 /* SSL3_ST_SW_SRVR_DONE_B */ 1304 return (ssl3_handshake_write(s)); 1305 1306 err: 1307 CBB_cleanup(&cbb); 1308 1309 return (-1); 1310 } 1311 1312 static int 1313 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) 1314 { 1315 int nid = NID_dhKeyAgreement; 1316 1317 tls_key_share_free(s->s3->hs.key_share); 1318 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1319 goto err; 1320 1321 if (s->cert->dhe_params_auto != 0) { 1322 size_t key_bits; 1323 1324 if ((key_bits = ssl_dhe_params_auto_key_bits(s)) == 0) { 1325 SSLerror(s, ERR_R_INTERNAL_ERROR); 1326 ssl3_send_alert(s, SSL3_AL_FATAL, 1327 SSL_AD_INTERNAL_ERROR); 1328 goto err; 1329 } 1330 tls_key_share_set_key_bits(s->s3->hs.key_share, 1331 key_bits); 1332 } else { 1333 DH *dh_params = s->cert->dhe_params; 1334 1335 if (dh_params == NULL && s->cert->dhe_params_cb != NULL) 1336 dh_params = s->cert->dhe_params_cb(s, 0, 1337 SSL_C_PKEYLENGTH(s->s3->hs.cipher)); 1338 1339 if (dh_params == NULL) { 1340 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1341 ssl3_send_alert(s, SSL3_AL_FATAL, 1342 SSL_AD_HANDSHAKE_FAILURE); 1343 goto err; 1344 } 1345 1346 if (!tls_key_share_set_dh_params(s->s3->hs.key_share, dh_params)) 1347 goto err; 1348 } 1349 1350 if (!tls_key_share_generate(s->s3->hs.key_share)) 1351 goto err; 1352 1353 if (!tls_key_share_params(s->s3->hs.key_share, cbb)) 1354 goto err; 1355 if (!tls_key_share_public(s->s3->hs.key_share, cbb)) 1356 goto err; 1357 1358 return 1; 1359 1360 err: 1361 return 0; 1362 } 1363 1364 static int 1365 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) 1366 { 1367 CBB public; 1368 int nid; 1369 1370 if ((nid = tls1_get_shared_curve(s)) == NID_undef) { 1371 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1372 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1373 goto err; 1374 } 1375 1376 tls_key_share_free(s->s3->hs.key_share); 1377 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1378 goto err; 1379 1380 if (!tls_key_share_generate(s->s3->hs.key_share)) 1381 goto err; 1382 1383 /* 1384 * ECC key exchange - see RFC 8422, section 5.4. 1385 */ 1386 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1387 goto err; 1388 if (!CBB_add_u16(cbb, tls_key_share_group(s->s3->hs.key_share))) 1389 goto err; 1390 if (!CBB_add_u8_length_prefixed(cbb, &public)) 1391 goto err; 1392 if (!tls_key_share_public(s->s3->hs.key_share, &public)) 1393 goto err; 1394 if (!CBB_flush(cbb)) 1395 goto err; 1396 1397 return 1; 1398 1399 err: 1400 return 0; 1401 } 1402 1403 int 1404 ssl3_send_server_key_exchange(SSL *s) 1405 { 1406 CBB cbb, cbb_params, cbb_signature, server_kex; 1407 const struct ssl_sigalg *sigalg = NULL; 1408 unsigned char *signature = NULL; 1409 size_t signature_len = 0; 1410 unsigned char *params = NULL; 1411 size_t params_len; 1412 const EVP_MD *md = NULL; 1413 unsigned long type; 1414 EVP_MD_CTX *md_ctx = NULL; 1415 EVP_PKEY_CTX *pctx; 1416 EVP_PKEY *pkey; 1417 int al; 1418 1419 memset(&cbb, 0, sizeof(cbb)); 1420 memset(&cbb_params, 0, sizeof(cbb_params)); 1421 1422 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 1423 goto err; 1424 1425 if (s->s3->hs.state == SSL3_ST_SW_KEY_EXCH_A) { 1426 1427 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex, 1428 SSL3_MT_SERVER_KEY_EXCHANGE)) 1429 goto err; 1430 1431 if (!CBB_init(&cbb_params, 0)) 1432 goto err; 1433 1434 type = s->s3->hs.cipher->algorithm_mkey; 1435 if (type & SSL_kDHE) { 1436 if (!ssl3_send_server_kex_dhe(s, &cbb_params)) 1437 goto err; 1438 } else if (type & SSL_kECDHE) { 1439 if (!ssl3_send_server_kex_ecdhe(s, &cbb_params)) 1440 goto err; 1441 } else { 1442 al = SSL_AD_HANDSHAKE_FAILURE; 1443 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1444 goto fatal_err; 1445 } 1446 1447 if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len)) 1448 goto err; 1449 1450 if (!CBB_add_bytes(&server_kex, params, params_len)) 1451 goto err; 1452 1453 /* Add signature unless anonymous. */ 1454 if (!(s->s3->hs.cipher->algorithm_auth & SSL_aNULL)) { 1455 if ((pkey = ssl_get_sign_pkey(s, s->s3->hs.cipher, 1456 &md, &sigalg)) == NULL) { 1457 al = SSL_AD_DECODE_ERROR; 1458 goto fatal_err; 1459 } 1460 s->s3->hs.our_sigalg = sigalg; 1461 1462 /* Send signature algorithm. */ 1463 if (SSL_USE_SIGALGS(s)) { 1464 if (!CBB_add_u16(&server_kex, sigalg->value)) { 1465 al = SSL_AD_INTERNAL_ERROR; 1466 SSLerror(s, ERR_R_INTERNAL_ERROR); 1467 goto fatal_err; 1468 } 1469 } 1470 1471 if (!EVP_DigestSignInit(md_ctx, &pctx, md, NULL, pkey)) { 1472 SSLerror(s, ERR_R_EVP_LIB); 1473 goto err; 1474 } 1475 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1476 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1477 RSA_PKCS1_PSS_PADDING) || 1478 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1479 SSLerror(s, ERR_R_EVP_LIB); 1480 goto err; 1481 } 1482 if (!EVP_DigestSignUpdate(md_ctx, s->s3->client_random, 1483 SSL3_RANDOM_SIZE)) { 1484 SSLerror(s, ERR_R_EVP_LIB); 1485 goto err; 1486 } 1487 if (!EVP_DigestSignUpdate(md_ctx, s->s3->server_random, 1488 SSL3_RANDOM_SIZE)) { 1489 SSLerror(s, ERR_R_EVP_LIB); 1490 goto err; 1491 } 1492 if (!EVP_DigestSignUpdate(md_ctx, params, params_len)) { 1493 SSLerror(s, ERR_R_EVP_LIB); 1494 goto err; 1495 } 1496 if (!EVP_DigestSignFinal(md_ctx, NULL, &signature_len) || 1497 !signature_len) { 1498 SSLerror(s, ERR_R_EVP_LIB); 1499 goto err; 1500 } 1501 if ((signature = calloc(1, signature_len)) == NULL) { 1502 SSLerror(s, ERR_R_MALLOC_FAILURE); 1503 goto err; 1504 } 1505 if (!EVP_DigestSignFinal(md_ctx, signature, &signature_len)) { 1506 SSLerror(s, ERR_R_EVP_LIB); 1507 goto err; 1508 } 1509 1510 if (!CBB_add_u16_length_prefixed(&server_kex, 1511 &cbb_signature)) 1512 goto err; 1513 if (!CBB_add_bytes(&cbb_signature, signature, 1514 signature_len)) 1515 goto err; 1516 } 1517 1518 if (!ssl3_handshake_msg_finish(s, &cbb)) 1519 goto err; 1520 1521 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1522 } 1523 1524 EVP_MD_CTX_free(md_ctx); 1525 free(params); 1526 free(signature); 1527 1528 return (ssl3_handshake_write(s)); 1529 1530 fatal_err: 1531 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1532 err: 1533 CBB_cleanup(&cbb_params); 1534 CBB_cleanup(&cbb); 1535 EVP_MD_CTX_free(md_ctx); 1536 free(params); 1537 free(signature); 1538 1539 return (-1); 1540 } 1541 1542 int 1543 ssl3_send_certificate_request(SSL *s) 1544 { 1545 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1546 STACK_OF(X509_NAME) *sk = NULL; 1547 X509_NAME *name; 1548 int i; 1549 1550 /* 1551 * Certificate Request - RFC 5246 section 7.4.4. 1552 */ 1553 1554 memset(&cbb, 0, sizeof(cbb)); 1555 1556 if (s->s3->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1557 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, 1558 SSL3_MT_CERTIFICATE_REQUEST)) 1559 goto err; 1560 1561 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1562 goto err; 1563 if (!ssl3_get_req_cert_types(s, &cert_types)) 1564 goto err; 1565 1566 if (SSL_USE_SIGALGS(s)) { 1567 if (!CBB_add_u16_length_prefixed(&cert_request, 1568 &sigalgs)) 1569 goto err; 1570 if (!ssl_sigalgs_build( 1571 s->s3->hs.negotiated_tls_version, &sigalgs)) 1572 goto err; 1573 } 1574 1575 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) 1576 goto err; 1577 1578 sk = SSL_get_client_CA_list(s); 1579 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1580 unsigned char *name_data; 1581 size_t name_len; 1582 1583 name = sk_X509_NAME_value(sk, i); 1584 name_len = i2d_X509_NAME(name, NULL); 1585 1586 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) 1587 goto err; 1588 if (!CBB_add_space(&dn, &name_data, name_len)) 1589 goto err; 1590 if (i2d_X509_NAME(name, &name_data) != name_len) 1591 goto err; 1592 } 1593 1594 if (!ssl3_handshake_msg_finish(s, &cbb)) 1595 goto err; 1596 1597 s->s3->hs.state = SSL3_ST_SW_CERT_REQ_B; 1598 } 1599 1600 /* SSL3_ST_SW_CERT_REQ_B */ 1601 return (ssl3_handshake_write(s)); 1602 1603 err: 1604 CBB_cleanup(&cbb); 1605 1606 return (-1); 1607 } 1608 1609 static int 1610 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs) 1611 { 1612 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; 1613 unsigned char *pms = NULL; 1614 unsigned char *p; 1615 size_t pms_len = 0; 1616 EVP_PKEY *pkey = NULL; 1617 RSA *rsa = NULL; 1618 CBS enc_pms; 1619 int decrypt_len; 1620 int al = -1; 1621 1622 arc4random_buf(fakekey, sizeof(fakekey)); 1623 1624 fakekey[0] = s->s3->hs.peer_legacy_version >> 8; 1625 fakekey[1] = s->s3->hs.peer_legacy_version & 0xff; 1626 1627 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey; 1628 if (pkey == NULL || (rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 1629 al = SSL_AD_HANDSHAKE_FAILURE; 1630 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); 1631 goto fatal_err; 1632 } 1633 1634 pms_len = RSA_size(rsa); 1635 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH) 1636 goto err; 1637 if ((pms = malloc(pms_len)) == NULL) 1638 goto err; 1639 p = pms; 1640 1641 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms)) 1642 goto decode_err; 1643 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) { 1644 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1645 goto err; 1646 } 1647 1648 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms), 1649 pms, rsa, RSA_PKCS1_PADDING); 1650 1651 ERR_clear_error(); 1652 1653 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) { 1654 al = SSL_AD_DECODE_ERROR; 1655 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ 1656 } 1657 1658 if ((al == -1) && !((pms[0] == (s->s3->hs.peer_legacy_version >> 8)) && 1659 (pms[1] == (s->s3->hs.peer_legacy_version & 0xff)))) { 1660 /* 1661 * The premaster secret must contain the same version number 1662 * as the ClientHello to detect version rollback attacks 1663 * (strangely, the protocol does not offer such protection for 1664 * DH ciphersuites). 1665 * 1666 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack 1667 * (http://eprint.iacr.org/2003/052/) exploits the version 1668 * number check as a "bad version oracle" -- an alert would 1669 * reveal that the plaintext corresponding to some ciphertext 1670 * made up by the adversary is properly formatted except that 1671 * the version number is wrong. To avoid such attacks, we should 1672 * treat this just like any other decryption error. 1673 */ 1674 al = SSL_AD_DECODE_ERROR; 1675 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ 1676 } 1677 1678 if (al != -1) { 1679 /* 1680 * Some decryption failure -- use random value instead 1681 * as countermeasure against Bleichenbacher's attack 1682 * on PKCS #1 v1.5 RSA padding (see RFC 2246, 1683 * section 7.4.7.1). 1684 */ 1685 p = fakekey; 1686 } 1687 1688 if (!tls12_derive_master_secret(s, p, SSL_MAX_MASTER_KEY_LENGTH)) 1689 goto err; 1690 1691 freezero(pms, pms_len); 1692 1693 return 1; 1694 1695 decode_err: 1696 al = SSL_AD_DECODE_ERROR; 1697 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1698 fatal_err: 1699 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1700 err: 1701 freezero(pms, pms_len); 1702 1703 return 0; 1704 } 1705 1706 static int 1707 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) 1708 { 1709 uint8_t *key = NULL; 1710 size_t key_len = 0; 1711 int decode_error, invalid_key; 1712 int ret = 0; 1713 1714 if (s->s3->hs.key_share == NULL) { 1715 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1716 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1717 goto err; 1718 } 1719 1720 if (!tls_key_share_peer_public(s->s3->hs.key_share, cbs, 1721 &decode_error, &invalid_key)) { 1722 if (decode_error) { 1723 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1724 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1725 } 1726 goto err; 1727 } 1728 if (invalid_key) { 1729 SSLerror(s, SSL_R_BAD_DH_PUB_KEY_LENGTH); 1730 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1731 goto err; 1732 } 1733 1734 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1735 goto err; 1736 1737 if (!tls12_derive_master_secret(s, key, key_len)) 1738 goto err; 1739 1740 ret = 1; 1741 1742 err: 1743 freezero(key, key_len); 1744 1745 return ret; 1746 } 1747 1748 static int 1749 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) 1750 { 1751 uint8_t *key = NULL; 1752 size_t key_len = 0; 1753 int decode_error; 1754 CBS public; 1755 int ret = 0; 1756 1757 if (s->s3->hs.key_share == NULL) { 1758 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1759 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1760 goto err; 1761 } 1762 1763 if (!CBS_get_u8_length_prefixed(cbs, &public)) { 1764 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1765 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1766 goto err; 1767 } 1768 if (!tls_key_share_peer_public(s->s3->hs.key_share, &public, 1769 &decode_error, NULL)) { 1770 if (decode_error) { 1771 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1772 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1773 } 1774 goto err; 1775 } 1776 1777 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1778 goto err; 1779 1780 if (!tls12_derive_master_secret(s, key, key_len)) 1781 goto err; 1782 1783 ret = 1; 1784 1785 err: 1786 freezero(key, key_len); 1787 1788 return ret; 1789 } 1790 1791 static int 1792 ssl3_get_client_kex_gost(SSL *s, CBS *cbs) 1793 { 1794 unsigned char premaster_secret[32]; 1795 EVP_PKEY_CTX *pkey_ctx = NULL; 1796 EVP_PKEY *client_pubkey; 1797 EVP_PKEY *pkey = NULL; 1798 size_t outlen; 1799 CBS gostblob; 1800 1801 /* Get our certificate private key*/ 1802 if ((s->s3->hs.cipher->algorithm_auth & SSL_aGOST01) != 0) 1803 pkey = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 1804 1805 if ((pkey_ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) 1806 goto err; 1807 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) 1808 goto err; 1809 1810 /* 1811 * If client certificate is present and is of the same type, 1812 * maybe use it for key exchange. 1813 * Don't mind errors from EVP_PKEY_derive_set_peer, because 1814 * it is completely valid to use a client certificate for 1815 * authorization only. 1816 */ 1817 if ((client_pubkey = X509_get0_pubkey(s->session->peer_cert)) != NULL) { 1818 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pubkey) <= 0) 1819 ERR_clear_error(); 1820 } 1821 1822 /* Decrypt session key */ 1823 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) 1824 goto decode_err; 1825 if (CBS_len(cbs) != 0) 1826 goto decode_err; 1827 outlen = sizeof(premaster_secret); 1828 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 1829 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { 1830 SSLerror(s, SSL_R_DECRYPTION_FAILED); 1831 goto err; 1832 } 1833 1834 if (!tls12_derive_master_secret(s, premaster_secret, 1835 sizeof(premaster_secret))) 1836 goto err; 1837 1838 /* Check if pubkey from client certificate was used */ 1839 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 1840 2, NULL) > 0) 1841 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 1842 1843 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 1844 EVP_PKEY_CTX_free(pkey_ctx); 1845 1846 return 1; 1847 1848 decode_err: 1849 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1850 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1851 err: 1852 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 1853 EVP_PKEY_CTX_free(pkey_ctx); 1854 1855 return 0; 1856 } 1857 1858 int 1859 ssl3_get_client_key_exchange(SSL *s) 1860 { 1861 unsigned long alg_k; 1862 int al, ret; 1863 CBS cbs; 1864 1865 /* 2048 maxlen is a guess. How long a key does that permit? */ 1866 if ((ret = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 1867 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048)) <= 0) 1868 return ret; 1869 1870 if (s->internal->init_num < 0) 1871 goto err; 1872 1873 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1874 1875 alg_k = s->s3->hs.cipher->algorithm_mkey; 1876 1877 if (alg_k & SSL_kRSA) { 1878 if (!ssl3_get_client_kex_rsa(s, &cbs)) 1879 goto err; 1880 } else if (alg_k & SSL_kDHE) { 1881 if (!ssl3_get_client_kex_dhe(s, &cbs)) 1882 goto err; 1883 } else if (alg_k & SSL_kECDHE) { 1884 if (!ssl3_get_client_kex_ecdhe(s, &cbs)) 1885 goto err; 1886 } else if (alg_k & SSL_kGOST) { 1887 if (!ssl3_get_client_kex_gost(s, &cbs)) 1888 goto err; 1889 } else { 1890 al = SSL_AD_HANDSHAKE_FAILURE; 1891 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 1892 goto fatal_err; 1893 } 1894 1895 if (CBS_len(&cbs) != 0) { 1896 al = SSL_AD_DECODE_ERROR; 1897 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1898 goto fatal_err; 1899 } 1900 1901 return (1); 1902 1903 fatal_err: 1904 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1905 err: 1906 return (-1); 1907 } 1908 1909 int 1910 ssl3_get_cert_verify(SSL *s) 1911 { 1912 CBS cbs, signature; 1913 const struct ssl_sigalg *sigalg = NULL; 1914 uint16_t sigalg_value = SIGALG_NONE; 1915 EVP_PKEY *pkey; 1916 X509 *peer_cert = NULL; 1917 EVP_MD_CTX *mctx = NULL; 1918 int al, verify; 1919 const unsigned char *hdata; 1920 size_t hdatalen; 1921 int type = 0; 1922 int ret; 1923 1924 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 1925 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH)) <= 0) 1926 return ret; 1927 1928 ret = 0; 1929 1930 if (s->internal->init_num < 0) 1931 goto err; 1932 1933 if ((mctx = EVP_MD_CTX_new()) == NULL) 1934 goto err; 1935 1936 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 1937 1938 peer_cert = s->session->peer_cert; 1939 pkey = X509_get0_pubkey(peer_cert); 1940 type = X509_certificate_type(peer_cert, pkey); 1941 1942 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 1943 s->s3->hs.tls12.reuse_message = 1; 1944 if (peer_cert != NULL) { 1945 al = SSL_AD_UNEXPECTED_MESSAGE; 1946 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 1947 goto fatal_err; 1948 } 1949 ret = 1; 1950 goto end; 1951 } 1952 1953 if (peer_cert == NULL) { 1954 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 1955 al = SSL_AD_UNEXPECTED_MESSAGE; 1956 goto fatal_err; 1957 } 1958 1959 if (!(type & EVP_PKT_SIGN)) { 1960 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 1961 al = SSL_AD_ILLEGAL_PARAMETER; 1962 goto fatal_err; 1963 } 1964 1965 if (s->s3->change_cipher_spec) { 1966 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 1967 al = SSL_AD_UNEXPECTED_MESSAGE; 1968 goto fatal_err; 1969 } 1970 1971 if (SSL_USE_SIGALGS(s)) { 1972 if (!CBS_get_u16(&cbs, &sigalg_value)) 1973 goto decode_err; 1974 } 1975 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 1976 goto err; 1977 if (CBS_len(&cbs) != 0) { 1978 al = SSL_AD_DECODE_ERROR; 1979 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 1980 goto fatal_err; 1981 } 1982 1983 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 1984 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 1985 al = SSL_AD_DECODE_ERROR; 1986 goto fatal_err; 1987 } 1988 1989 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 1990 sigalg_value)) == NULL) { 1991 al = SSL_AD_DECODE_ERROR; 1992 goto fatal_err; 1993 } 1994 s->s3->hs.peer_sigalg = sigalg; 1995 1996 if (SSL_USE_SIGALGS(s)) { 1997 EVP_PKEY_CTX *pctx; 1998 1999 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2000 SSLerror(s, ERR_R_INTERNAL_ERROR); 2001 al = SSL_AD_INTERNAL_ERROR; 2002 goto fatal_err; 2003 } 2004 if (!EVP_DigestVerifyInit(mctx, &pctx, sigalg->md(), 2005 NULL, pkey)) { 2006 SSLerror(s, ERR_R_EVP_LIB); 2007 al = SSL_AD_INTERNAL_ERROR; 2008 goto fatal_err; 2009 } 2010 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2011 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 2012 RSA_PKCS1_PSS_PADDING) || 2013 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2014 al = SSL_AD_INTERNAL_ERROR; 2015 goto fatal_err; 2016 } 2017 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2018 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2019 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, 2020 NULL) <= 0) { 2021 al = SSL_AD_INTERNAL_ERROR; 2022 goto fatal_err; 2023 } 2024 if (!EVP_DigestVerifyUpdate(mctx, hdata, hdatalen)) { 2025 SSLerror(s, ERR_R_EVP_LIB); 2026 al = SSL_AD_INTERNAL_ERROR; 2027 goto fatal_err; 2028 } 2029 if (EVP_DigestVerifyFinal(mctx, CBS_data(&signature), 2030 CBS_len(&signature)) <= 0) { 2031 al = SSL_AD_DECRYPT_ERROR; 2032 SSLerror(s, SSL_R_BAD_SIGNATURE); 2033 goto fatal_err; 2034 } 2035 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) { 2036 RSA *rsa; 2037 2038 if ((rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 2039 al = SSL_AD_INTERNAL_ERROR; 2040 SSLerror(s, ERR_R_EVP_LIB); 2041 goto fatal_err; 2042 } 2043 verify = RSA_verify(NID_md5_sha1, s->s3->hs.tls12.cert_verify, 2044 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), 2045 CBS_len(&signature), rsa); 2046 if (verify < 0) { 2047 al = SSL_AD_DECRYPT_ERROR; 2048 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2049 goto fatal_err; 2050 } 2051 if (verify == 0) { 2052 al = SSL_AD_DECRYPT_ERROR; 2053 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2054 goto fatal_err; 2055 } 2056 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { 2057 EC_KEY *eckey; 2058 2059 if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL) { 2060 al = SSL_AD_INTERNAL_ERROR; 2061 SSLerror(s, ERR_R_EVP_LIB); 2062 goto fatal_err; 2063 } 2064 verify = ECDSA_verify(0, 2065 &(s->s3->hs.tls12.cert_verify[MD5_DIGEST_LENGTH]), 2066 SHA_DIGEST_LENGTH, CBS_data(&signature), 2067 CBS_len(&signature), eckey); 2068 if (verify <= 0) { 2069 al = SSL_AD_DECRYPT_ERROR; 2070 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2071 goto fatal_err; 2072 } 2073 #ifndef OPENSSL_NO_GOST 2074 } else if (EVP_PKEY_id(pkey) == NID_id_GostR3410_94 || 2075 EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) { 2076 unsigned char sigbuf[128]; 2077 unsigned int siglen = sizeof(sigbuf); 2078 EVP_PKEY_CTX *pctx; 2079 const EVP_MD *md; 2080 int nid; 2081 2082 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2083 SSLerror(s, ERR_R_INTERNAL_ERROR); 2084 al = SSL_AD_INTERNAL_ERROR; 2085 goto fatal_err; 2086 } 2087 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2088 !(md = EVP_get_digestbynid(nid))) { 2089 SSLerror(s, ERR_R_EVP_LIB); 2090 al = SSL_AD_INTERNAL_ERROR; 2091 goto fatal_err; 2092 } 2093 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 2094 SSLerror(s, ERR_R_EVP_LIB); 2095 al = SSL_AD_INTERNAL_ERROR; 2096 goto fatal_err; 2097 } 2098 if (!EVP_DigestInit_ex(mctx, md, NULL) || 2099 !EVP_DigestUpdate(mctx, hdata, hdatalen) || 2100 !EVP_DigestFinal(mctx, sigbuf, &siglen) || 2101 (EVP_PKEY_verify_init(pctx) <= 0) || 2102 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2103 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2104 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2105 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { 2106 SSLerror(s, ERR_R_EVP_LIB); 2107 al = SSL_AD_INTERNAL_ERROR; 2108 EVP_PKEY_CTX_free(pctx); 2109 goto fatal_err; 2110 } 2111 if (EVP_PKEY_verify(pctx, CBS_data(&signature), 2112 CBS_len(&signature), sigbuf, siglen) <= 0) { 2113 al = SSL_AD_DECRYPT_ERROR; 2114 SSLerror(s, SSL_R_BAD_SIGNATURE); 2115 EVP_PKEY_CTX_free(pctx); 2116 goto fatal_err; 2117 } 2118 2119 EVP_PKEY_CTX_free(pctx); 2120 #endif 2121 } else { 2122 SSLerror(s, ERR_R_INTERNAL_ERROR); 2123 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2124 goto fatal_err; 2125 } 2126 2127 ret = 1; 2128 if (0) { 2129 decode_err: 2130 al = SSL_AD_DECODE_ERROR; 2131 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2132 fatal_err: 2133 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2134 } 2135 end: 2136 tls1_transcript_free(s); 2137 err: 2138 EVP_MD_CTX_free(mctx); 2139 2140 return (ret); 2141 } 2142 2143 int 2144 ssl3_get_client_certificate(SSL *s) 2145 { 2146 CBS cbs, client_certs; 2147 X509 *x = NULL; 2148 const unsigned char *q; 2149 STACK_OF(X509) *sk = NULL; 2150 int i, al, ret; 2151 2152 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2153 -1, s->internal->max_cert_list)) <= 0) 2154 return ret; 2155 2156 ret = -1; 2157 2158 if (s->s3->hs.tls12.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2159 if ((s->verify_mode & SSL_VERIFY_PEER) && 2160 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2161 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2162 al = SSL_AD_HANDSHAKE_FAILURE; 2163 goto fatal_err; 2164 } 2165 /* 2166 * If tls asked for a client cert, 2167 * the client must return a 0 list. 2168 */ 2169 if (s->s3->hs.tls12.cert_request) { 2170 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 2171 ); 2172 al = SSL_AD_UNEXPECTED_MESSAGE; 2173 goto fatal_err; 2174 } 2175 s->s3->hs.tls12.reuse_message = 1; 2176 return (1); 2177 } 2178 2179 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 2180 al = SSL_AD_UNEXPECTED_MESSAGE; 2181 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2182 goto fatal_err; 2183 } 2184 2185 if (s->internal->init_num < 0) 2186 goto decode_err; 2187 2188 CBS_init(&cbs, s->internal->init_msg, s->internal->init_num); 2189 2190 if ((sk = sk_X509_new_null()) == NULL) { 2191 SSLerror(s, ERR_R_MALLOC_FAILURE); 2192 goto err; 2193 } 2194 2195 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) || 2196 CBS_len(&cbs) != 0) 2197 goto decode_err; 2198 2199 while (CBS_len(&client_certs) > 0) { 2200 CBS cert; 2201 2202 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) { 2203 al = SSL_AD_DECODE_ERROR; 2204 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2205 goto fatal_err; 2206 } 2207 2208 q = CBS_data(&cert); 2209 x = d2i_X509(NULL, &q, CBS_len(&cert)); 2210 if (x == NULL) { 2211 SSLerror(s, ERR_R_ASN1_LIB); 2212 goto err; 2213 } 2214 if (q != CBS_data(&cert) + CBS_len(&cert)) { 2215 al = SSL_AD_DECODE_ERROR; 2216 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2217 goto fatal_err; 2218 } 2219 if (!sk_X509_push(sk, x)) { 2220 SSLerror(s, ERR_R_MALLOC_FAILURE); 2221 goto err; 2222 } 2223 x = NULL; 2224 } 2225 2226 if (sk_X509_num(sk) <= 0) { 2227 /* 2228 * TLS does not mind 0 certs returned. 2229 * Fail for TLS only if we required a certificate. 2230 */ 2231 if ((s->verify_mode & SSL_VERIFY_PEER) && 2232 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2233 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2234 al = SSL_AD_HANDSHAKE_FAILURE; 2235 goto fatal_err; 2236 } 2237 /* No client certificate so free transcript. */ 2238 tls1_transcript_free(s); 2239 } else { 2240 i = ssl_verify_cert_chain(s, sk); 2241 if (i <= 0) { 2242 al = ssl_verify_alarm_type(s->verify_result); 2243 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2244 goto fatal_err; 2245 } 2246 } 2247 2248 X509_free(s->session->peer_cert); 2249 s->session->peer_cert = sk_X509_shift(sk); 2250 2251 /* 2252 * Inconsistency alert: cert_chain does *not* include the 2253 * peer's own certificate, while we do include it in s3_clnt.c 2254 */ 2255 sk_X509_pop_free(s->session->cert_chain, X509_free); 2256 s->session->cert_chain = sk; 2257 sk = NULL; 2258 2259 s->session->verify_result = s->verify_result; 2260 2261 ret = 1; 2262 if (0) { 2263 decode_err: 2264 al = SSL_AD_DECODE_ERROR; 2265 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2266 fatal_err: 2267 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2268 } 2269 err: 2270 X509_free(x); 2271 sk_X509_pop_free(sk, X509_free); 2272 2273 return (ret); 2274 } 2275 2276 int 2277 ssl3_send_server_certificate(SSL *s) 2278 { 2279 CBB cbb, server_cert; 2280 SSL_CERT_PKEY *cpk; 2281 2282 /* 2283 * Server Certificate - RFC 5246, section 7.4.2. 2284 */ 2285 2286 memset(&cbb, 0, sizeof(cbb)); 2287 2288 if (s->s3->hs.state == SSL3_ST_SW_CERT_A) { 2289 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { 2290 SSLerror(s, ERR_R_INTERNAL_ERROR); 2291 return (0); 2292 } 2293 2294 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, 2295 SSL3_MT_CERTIFICATE)) 2296 goto err; 2297 if (!ssl3_output_cert_chain(s, &server_cert, cpk)) 2298 goto err; 2299 if (!ssl3_handshake_msg_finish(s, &cbb)) 2300 goto err; 2301 2302 s->s3->hs.state = SSL3_ST_SW_CERT_B; 2303 } 2304 2305 /* SSL3_ST_SW_CERT_B */ 2306 return (ssl3_handshake_write(s)); 2307 2308 err: 2309 CBB_cleanup(&cbb); 2310 2311 return (0); 2312 } 2313 2314 /* send a new session ticket (not necessarily for a new session) */ 2315 int 2316 ssl3_send_newsession_ticket(SSL *s) 2317 { 2318 CBB cbb, session_ticket, ticket; 2319 SSL_CTX *tctx = s->initial_ctx; 2320 size_t enc_session_len, enc_session_max_len, hmac_len; 2321 size_t session_len = 0; 2322 unsigned char *enc_session = NULL, *session = NULL; 2323 unsigned char iv[EVP_MAX_IV_LENGTH]; 2324 unsigned char key_name[16]; 2325 unsigned char *hmac; 2326 unsigned int hlen; 2327 EVP_CIPHER_CTX *ctx = NULL; 2328 HMAC_CTX *hctx = NULL; 2329 int len; 2330 2331 /* 2332 * New Session Ticket - RFC 5077, section 3.3. 2333 */ 2334 2335 memset(&cbb, 0, sizeof(cbb)); 2336 2337 if ((ctx = EVP_CIPHER_CTX_new()) == NULL) 2338 goto err; 2339 if ((hctx = HMAC_CTX_new()) == NULL) 2340 goto err; 2341 2342 if (s->s3->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2343 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, 2344 SSL3_MT_NEWSESSION_TICKET)) 2345 goto err; 2346 2347 if (!SSL_SESSION_ticket(s->session, &session, &session_len)) 2348 goto err; 2349 if (session_len > 0xffff) 2350 goto err; 2351 2352 /* 2353 * Initialize HMAC and cipher contexts. If callback is present 2354 * it does all the work, otherwise use generated values from 2355 * parent context. 2356 */ 2357 if (tctx->internal->tlsext_ticket_key_cb != NULL) { 2358 if (tctx->internal->tlsext_ticket_key_cb(s, 2359 key_name, iv, ctx, hctx, 1) < 0) 2360 goto err; 2361 } else { 2362 arc4random_buf(iv, 16); 2363 EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, 2364 tctx->internal->tlsext_tick_aes_key, iv); 2365 HMAC_Init_ex(hctx, tctx->internal->tlsext_tick_hmac_key, 2366 16, EVP_sha256(), NULL); 2367 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); 2368 } 2369 2370 /* Encrypt the session state. */ 2371 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; 2372 if ((enc_session = calloc(1, enc_session_max_len)) == NULL) 2373 goto err; 2374 enc_session_len = 0; 2375 if (!EVP_EncryptUpdate(ctx, enc_session, &len, session, 2376 session_len)) 2377 goto err; 2378 enc_session_len += len; 2379 if (!EVP_EncryptFinal_ex(ctx, enc_session + enc_session_len, 2380 &len)) 2381 goto err; 2382 enc_session_len += len; 2383 2384 if (enc_session_len > enc_session_max_len) 2385 goto err; 2386 2387 /* Generate the HMAC. */ 2388 if (!HMAC_Update(hctx, key_name, sizeof(key_name))) 2389 goto err; 2390 if (!HMAC_Update(hctx, iv, EVP_CIPHER_CTX_iv_length(ctx))) 2391 goto err; 2392 if (!HMAC_Update(hctx, enc_session, enc_session_len)) 2393 goto err; 2394 2395 if ((hmac_len = HMAC_size(hctx)) <= 0) 2396 goto err; 2397 2398 /* 2399 * Ticket lifetime hint (advisory only): 2400 * We leave this unspecified for resumed session 2401 * (for simplicity), and guess that tickets for new 2402 * sessions will live as long as their sessions. 2403 */ 2404 if (!CBB_add_u32(&session_ticket, 2405 s->internal->hit ? 0 : s->session->timeout)) 2406 goto err; 2407 2408 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) 2409 goto err; 2410 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) 2411 goto err; 2412 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(ctx))) 2413 goto err; 2414 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) 2415 goto err; 2416 if (!CBB_add_space(&ticket, &hmac, hmac_len)) 2417 goto err; 2418 2419 if (!HMAC_Final(hctx, hmac, &hlen)) 2420 goto err; 2421 if (hlen != hmac_len) 2422 goto err; 2423 2424 if (!ssl3_handshake_msg_finish(s, &cbb)) 2425 goto err; 2426 2427 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2428 } 2429 2430 EVP_CIPHER_CTX_free(ctx); 2431 HMAC_CTX_free(hctx); 2432 freezero(session, session_len); 2433 free(enc_session); 2434 2435 /* SSL3_ST_SW_SESSION_TICKET_B */ 2436 return (ssl3_handshake_write(s)); 2437 2438 err: 2439 CBB_cleanup(&cbb); 2440 EVP_CIPHER_CTX_free(ctx); 2441 HMAC_CTX_free(hctx); 2442 freezero(session, session_len); 2443 free(enc_session); 2444 2445 return (-1); 2446 } 2447 2448 int 2449 ssl3_send_cert_status(SSL *s) 2450 { 2451 CBB cbb, certstatus, ocspresp; 2452 2453 memset(&cbb, 0, sizeof(cbb)); 2454 2455 if (s->s3->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2456 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, 2457 SSL3_MT_CERTIFICATE_STATUS)) 2458 goto err; 2459 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2460 goto err; 2461 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2462 goto err; 2463 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, 2464 s->internal->tlsext_ocsp_resp_len)) 2465 goto err; 2466 if (!ssl3_handshake_msg_finish(s, &cbb)) 2467 goto err; 2468 2469 s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2470 } 2471 2472 /* SSL3_ST_SW_CERT_STATUS_B */ 2473 return (ssl3_handshake_write(s)); 2474 2475 err: 2476 CBB_cleanup(&cbb); 2477 2478 return (-1); 2479 } 2480