1 /* $OpenBSD: ssl_srvr.c,v 1.155 2023/06/11 19:01:01 tb Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <limits.h> 152 #include <stdio.h> 153 154 #include <openssl/bn.h> 155 #include <openssl/buffer.h> 156 #include <openssl/curve25519.h> 157 #include <openssl/evp.h> 158 #include <openssl/dh.h> 159 #include <openssl/hmac.h> 160 #include <openssl/md5.h> 161 #include <openssl/objects.h> 162 #include <openssl/opensslconf.h> 163 #include <openssl/x509.h> 164 165 #ifndef OPENSSL_NO_GOST 166 #include <openssl/gost.h> 167 #endif 168 169 #include "bytestring.h" 170 #include "dtls_local.h" 171 #include "ssl_local.h" 172 #include "ssl_sigalgs.h" 173 #include "ssl_tlsext.h" 174 175 static int ssl3_get_client_hello(SSL *s); 176 static int ssl3_send_dtls_hello_verify_request(SSL *s); 177 static int ssl3_send_server_hello(SSL *s); 178 static int ssl3_send_hello_request(SSL *s); 179 static int ssl3_send_server_certificate(SSL *s); 180 static int ssl3_send_server_key_exchange(SSL *s); 181 static int ssl3_send_certificate_request(SSL *s); 182 static int ssl3_send_server_done(SSL *s); 183 static int ssl3_get_client_certificate(SSL *s); 184 static int ssl3_get_client_key_exchange(SSL *s); 185 static int ssl3_get_cert_verify(SSL *s); 186 static int ssl3_send_newsession_ticket(SSL *s); 187 static int ssl3_send_cert_status(SSL *s); 188 static int ssl3_send_server_change_cipher_spec(SSL *s); 189 static int ssl3_send_server_finished(SSL *s); 190 static int ssl3_get_client_finished(SSL *s); 191 192 int 193 ssl3_accept(SSL *s) 194 { 195 unsigned long alg_k; 196 int new_state, state, skip = 0; 197 int listen = 0; 198 int ret = -1; 199 200 ERR_clear_error(); 201 errno = 0; 202 203 if (SSL_is_dtls(s)) 204 listen = s->d1->listen; 205 206 /* init things to blank */ 207 s->in_handshake++; 208 if (!SSL_in_init(s) || SSL_in_before(s)) 209 SSL_clear(s); 210 211 if (SSL_is_dtls(s)) 212 s->d1->listen = listen; 213 214 for (;;) { 215 state = s->s3->hs.state; 216 217 switch (s->s3->hs.state) { 218 case SSL_ST_RENEGOTIATE: 219 s->renegotiate = 1; 220 /* s->s3->hs.state=SSL_ST_ACCEPT; */ 221 222 case SSL_ST_BEFORE: 223 case SSL_ST_ACCEPT: 224 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 225 case SSL_ST_OK|SSL_ST_ACCEPT: 226 s->server = 1; 227 228 ssl_info_callback(s, SSL_CB_HANDSHAKE_START, 1); 229 230 if (!ssl_legacy_stack_version(s, s->version)) { 231 SSLerror(s, ERR_R_INTERNAL_ERROR); 232 ret = -1; 233 goto end; 234 } 235 236 if (!ssl_supported_tls_version_range(s, 237 &s->s3->hs.our_min_tls_version, 238 &s->s3->hs.our_max_tls_version)) { 239 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 240 ret = -1; 241 goto end; 242 } 243 244 if (!ssl_security_version(s, 245 s->s3->hs.our_min_tls_version)) { 246 SSLerror(s, SSL_R_VERSION_TOO_LOW); 247 ret = -1; 248 goto end; 249 } 250 251 if (!ssl3_setup_init_buffer(s)) { 252 ret = -1; 253 goto end; 254 } 255 if (!ssl3_setup_buffers(s)) { 256 ret = -1; 257 goto end; 258 } 259 260 s->init_num = 0; 261 262 if (s->s3->hs.state != SSL_ST_RENEGOTIATE) { 263 /* 264 * Ok, we now need to push on a buffering BIO 265 * so that the output is sent in a way that 266 * TCP likes :-) 267 */ 268 if (!ssl_init_wbio_buffer(s, 1)) { 269 ret = -1; 270 goto end; 271 } 272 273 if (!tls1_transcript_init(s)) { 274 ret = -1; 275 goto end; 276 } 277 278 s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_A; 279 s->ctx->stats.sess_accept++; 280 } else if (!SSL_is_dtls(s) && !s->s3->send_connection_binding) { 281 /* 282 * Server attempting to renegotiate with 283 * client that doesn't support secure 284 * renegotiation. 285 */ 286 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 287 ssl3_send_alert(s, SSL3_AL_FATAL, 288 SSL_AD_HANDSHAKE_FAILURE); 289 ret = -1; 290 goto end; 291 } else { 292 /* 293 * s->s3->hs.state == SSL_ST_RENEGOTIATE, 294 * we will just send a HelloRequest. 295 */ 296 s->ctx->stats.sess_accept_renegotiate++; 297 s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_A; 298 } 299 break; 300 301 case SSL3_ST_SW_HELLO_REQ_A: 302 case SSL3_ST_SW_HELLO_REQ_B: 303 s->shutdown = 0; 304 if (SSL_is_dtls(s)) { 305 dtls1_clear_record_buffer(s); 306 dtls1_start_timer(s); 307 } 308 ret = ssl3_send_hello_request(s); 309 if (ret <= 0) 310 goto end; 311 if (SSL_is_dtls(s)) 312 s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A; 313 else 314 s->s3->hs.tls12.next_state = SSL3_ST_SW_HELLO_REQ_C; 315 s->s3->hs.state = SSL3_ST_SW_FLUSH; 316 s->init_num = 0; 317 318 if (SSL_is_dtls(s)) { 319 if (!tls1_transcript_init(s)) { 320 ret = -1; 321 goto end; 322 } 323 } 324 break; 325 326 case SSL3_ST_SW_HELLO_REQ_C: 327 s->s3->hs.state = SSL_ST_OK; 328 break; 329 330 case SSL3_ST_SR_CLNT_HELLO_A: 331 case SSL3_ST_SR_CLNT_HELLO_B: 332 case SSL3_ST_SR_CLNT_HELLO_C: 333 s->shutdown = 0; 334 if (SSL_is_dtls(s)) { 335 ret = ssl3_get_client_hello(s); 336 if (ret <= 0) 337 goto end; 338 dtls1_stop_timer(s); 339 340 if (ret == 1 && 341 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 342 s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 343 else 344 s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 345 346 s->init_num = 0; 347 348 /* 349 * Reflect ClientHello sequence to remain 350 * stateless while listening. 351 */ 352 if (listen) { 353 tls12_record_layer_reflect_seq_num( 354 s->rl); 355 } 356 357 /* If we're just listening, stop here */ 358 if (listen && s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 359 ret = 2; 360 s->d1->listen = 0; 361 /* 362 * Set expected sequence numbers to 363 * continue the handshake. 364 */ 365 s->d1->handshake_read_seq = 2; 366 s->d1->handshake_write_seq = 1; 367 s->d1->next_handshake_write_seq = 1; 368 goto end; 369 } 370 } else { 371 if (s->rwstate != SSL_X509_LOOKUP) { 372 ret = ssl3_get_client_hello(s); 373 if (ret <= 0) 374 goto end; 375 } 376 377 s->renegotiate = 2; 378 s->s3->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 379 s->init_num = 0; 380 } 381 break; 382 383 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 384 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 385 ret = ssl3_send_dtls_hello_verify_request(s); 386 if (ret <= 0) 387 goto end; 388 s->s3->hs.state = SSL3_ST_SW_FLUSH; 389 s->s3->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A; 390 391 /* HelloVerifyRequest resets Finished MAC. */ 392 tls1_transcript_reset(s); 393 break; 394 395 case SSL3_ST_SW_SRVR_HELLO_A: 396 case SSL3_ST_SW_SRVR_HELLO_B: 397 if (SSL_is_dtls(s)) { 398 s->renegotiate = 2; 399 dtls1_start_timer(s); 400 } 401 ret = ssl3_send_server_hello(s); 402 if (ret <= 0) 403 goto end; 404 if (s->hit) { 405 if (s->tlsext_ticket_expected) 406 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 407 else 408 s->s3->hs.state = SSL3_ST_SW_CHANGE_A; 409 } else { 410 s->s3->hs.state = SSL3_ST_SW_CERT_A; 411 } 412 s->init_num = 0; 413 break; 414 415 case SSL3_ST_SW_CERT_A: 416 case SSL3_ST_SW_CERT_B: 417 /* Check if it is anon DH or anon ECDH. */ 418 if (!(s->s3->hs.cipher->algorithm_auth & 419 SSL_aNULL)) { 420 if (SSL_is_dtls(s)) 421 dtls1_start_timer(s); 422 ret = ssl3_send_server_certificate(s); 423 if (ret <= 0) 424 goto end; 425 if (s->tlsext_status_expected) 426 s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_A; 427 else 428 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A; 429 } else { 430 skip = 1; 431 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A; 432 } 433 s->init_num = 0; 434 break; 435 436 case SSL3_ST_SW_KEY_EXCH_A: 437 case SSL3_ST_SW_KEY_EXCH_B: 438 alg_k = s->s3->hs.cipher->algorithm_mkey; 439 440 /* 441 * Only send if using a DH key exchange. 442 * 443 * For ECC ciphersuites, we send a ServerKeyExchange 444 * message only if the cipher suite is ECDHE. In other 445 * cases, the server certificate contains the server's 446 * public key for key exchange. 447 */ 448 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 449 if (SSL_is_dtls(s)) 450 dtls1_start_timer(s); 451 ret = ssl3_send_server_key_exchange(s); 452 if (ret <= 0) 453 goto end; 454 } else 455 skip = 1; 456 457 s->s3->hs.state = SSL3_ST_SW_CERT_REQ_A; 458 s->init_num = 0; 459 break; 460 461 case SSL3_ST_SW_CERT_REQ_A: 462 case SSL3_ST_SW_CERT_REQ_B: 463 /* 464 * Determine whether or not we need to request a 465 * certificate. 466 * 467 * Do not request a certificate if: 468 * 469 * - We did not ask for it (SSL_VERIFY_PEER is unset). 470 * 471 * - SSL_VERIFY_CLIENT_ONCE is set and we are 472 * renegotiating. 473 * 474 * - We are using an anonymous ciphersuites 475 * (see section "Certificate request" in SSL 3 drafts 476 * and in RFC 2246) ... except when the application 477 * insists on verification (against the specs, but 478 * s3_clnt.c accepts this for SSL 3). 479 */ 480 if (!(s->verify_mode & SSL_VERIFY_PEER) || 481 ((s->session->peer_cert != NULL) && 482 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 483 ((s->s3->hs.cipher->algorithm_auth & 484 SSL_aNULL) && !(s->verify_mode & 485 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) { 486 /* No cert request. */ 487 skip = 1; 488 s->s3->hs.tls12.cert_request = 0; 489 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A; 490 491 if (!SSL_is_dtls(s)) 492 tls1_transcript_free(s); 493 } else { 494 s->s3->hs.tls12.cert_request = 1; 495 if (SSL_is_dtls(s)) 496 dtls1_start_timer(s); 497 ret = ssl3_send_certificate_request(s); 498 if (ret <= 0) 499 goto end; 500 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_A; 501 s->init_num = 0; 502 } 503 break; 504 505 case SSL3_ST_SW_SRVR_DONE_A: 506 case SSL3_ST_SW_SRVR_DONE_B: 507 if (SSL_is_dtls(s)) 508 dtls1_start_timer(s); 509 ret = ssl3_send_server_done(s); 510 if (ret <= 0) 511 goto end; 512 s->s3->hs.tls12.next_state = SSL3_ST_SR_CERT_A; 513 s->s3->hs.state = SSL3_ST_SW_FLUSH; 514 s->init_num = 0; 515 break; 516 517 case SSL3_ST_SW_FLUSH: 518 /* 519 * This code originally checked to see if 520 * any data was pending using BIO_CTRL_INFO 521 * and then flushed. This caused problems 522 * as documented in PR#1939. The proposed 523 * fix doesn't completely resolve this issue 524 * as buggy implementations of BIO_CTRL_PENDING 525 * still exist. So instead we just flush 526 * unconditionally. 527 */ 528 s->rwstate = SSL_WRITING; 529 if (BIO_flush(s->wbio) <= 0) { 530 if (SSL_is_dtls(s)) { 531 /* If the write error was fatal, stop trying. */ 532 if (!BIO_should_retry(s->wbio)) { 533 s->rwstate = SSL_NOTHING; 534 s->s3->hs.state = s->s3->hs.tls12.next_state; 535 } 536 } 537 ret = -1; 538 goto end; 539 } 540 s->rwstate = SSL_NOTHING; 541 s->s3->hs.state = s->s3->hs.tls12.next_state; 542 break; 543 544 case SSL3_ST_SR_CERT_A: 545 case SSL3_ST_SR_CERT_B: 546 if (s->s3->hs.tls12.cert_request != 0) { 547 ret = ssl3_get_client_certificate(s); 548 if (ret <= 0) 549 goto end; 550 } 551 s->init_num = 0; 552 s->s3->hs.state = SSL3_ST_SR_KEY_EXCH_A; 553 break; 554 555 case SSL3_ST_SR_KEY_EXCH_A: 556 case SSL3_ST_SR_KEY_EXCH_B: 557 ret = ssl3_get_client_key_exchange(s); 558 if (ret <= 0) 559 goto end; 560 561 if (SSL_is_dtls(s)) { 562 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A; 563 s->init_num = 0; 564 } 565 566 alg_k = s->s3->hs.cipher->algorithm_mkey; 567 if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) { 568 /* 569 * A GOST client may use the key from its 570 * certificate for key exchange, in which case 571 * the CertificateVerify message is not sent. 572 */ 573 s->s3->hs.state = SSL3_ST_SR_FINISHED_A; 574 s->init_num = 0; 575 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) { 576 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A; 577 s->init_num = 0; 578 if (!s->session->peer_cert) 579 break; 580 /* 581 * Freeze the transcript for use during client 582 * certificate verification. 583 */ 584 tls1_transcript_freeze(s); 585 } else { 586 s->s3->hs.state = SSL3_ST_SR_CERT_VRFY_A; 587 s->init_num = 0; 588 589 tls1_transcript_free(s); 590 591 /* 592 * We need to get hashes here so if there is 593 * a client cert, it can be verified. 594 */ 595 if (!tls1_transcript_hash_value(s, 596 s->s3->hs.tls12.cert_verify, 597 sizeof(s->s3->hs.tls12.cert_verify), 598 NULL)) { 599 ret = -1; 600 goto end; 601 } 602 } 603 break; 604 605 case SSL3_ST_SR_CERT_VRFY_A: 606 case SSL3_ST_SR_CERT_VRFY_B: 607 if (SSL_is_dtls(s)) 608 s->d1->change_cipher_spec_ok = 1; 609 else 610 s->s3->flags |= SSL3_FLAGS_CCS_OK; 611 612 /* we should decide if we expected this one */ 613 ret = ssl3_get_cert_verify(s); 614 if (ret <= 0) 615 goto end; 616 s->s3->hs.state = SSL3_ST_SR_FINISHED_A; 617 s->init_num = 0; 618 break; 619 620 case SSL3_ST_SR_FINISHED_A: 621 case SSL3_ST_SR_FINISHED_B: 622 if (SSL_is_dtls(s)) 623 s->d1->change_cipher_spec_ok = 1; 624 else 625 s->s3->flags |= SSL3_FLAGS_CCS_OK; 626 ret = ssl3_get_client_finished(s); 627 if (ret <= 0) 628 goto end; 629 if (SSL_is_dtls(s)) 630 dtls1_stop_timer(s); 631 if (s->hit) 632 s->s3->hs.state = SSL_ST_OK; 633 else if (s->tlsext_ticket_expected) 634 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 635 else 636 s->s3->hs.state = SSL3_ST_SW_CHANGE_A; 637 s->init_num = 0; 638 break; 639 640 case SSL3_ST_SW_SESSION_TICKET_A: 641 case SSL3_ST_SW_SESSION_TICKET_B: 642 ret = ssl3_send_newsession_ticket(s); 643 if (ret <= 0) 644 goto end; 645 s->s3->hs.state = SSL3_ST_SW_CHANGE_A; 646 s->init_num = 0; 647 break; 648 649 case SSL3_ST_SW_CERT_STATUS_A: 650 case SSL3_ST_SW_CERT_STATUS_B: 651 ret = ssl3_send_cert_status(s); 652 if (ret <= 0) 653 goto end; 654 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_A; 655 s->init_num = 0; 656 break; 657 658 case SSL3_ST_SW_CHANGE_A: 659 case SSL3_ST_SW_CHANGE_B: 660 ret = ssl3_send_server_change_cipher_spec(s); 661 if (ret <= 0) 662 goto end; 663 s->s3->hs.state = SSL3_ST_SW_FINISHED_A; 664 s->init_num = 0; 665 s->session->cipher = s->s3->hs.cipher; 666 667 if (!tls1_setup_key_block(s)) { 668 ret = -1; 669 goto end; 670 } 671 if (!tls1_change_write_cipher_state(s)) { 672 ret = -1; 673 goto end; 674 } 675 break; 676 677 case SSL3_ST_SW_FINISHED_A: 678 case SSL3_ST_SW_FINISHED_B: 679 ret = ssl3_send_server_finished(s); 680 if (ret <= 0) 681 goto end; 682 s->s3->hs.state = SSL3_ST_SW_FLUSH; 683 if (s->hit) { 684 s->s3->hs.tls12.next_state = SSL3_ST_SR_FINISHED_A; 685 tls1_transcript_free(s); 686 } else 687 s->s3->hs.tls12.next_state = SSL_ST_OK; 688 s->init_num = 0; 689 break; 690 691 case SSL_ST_OK: 692 /* clean a few things up */ 693 tls1_cleanup_key_block(s); 694 695 if (s->s3->handshake_transcript != NULL) { 696 SSLerror(s, ERR_R_INTERNAL_ERROR); 697 ret = -1; 698 goto end; 699 } 700 701 if (!SSL_is_dtls(s)) 702 ssl3_release_init_buffer(s); 703 704 /* remove buffering on output */ 705 ssl_free_wbio_buffer(s); 706 707 s->init_num = 0; 708 709 /* Skipped if we just sent a HelloRequest. */ 710 if (s->renegotiate == 2) { 711 s->renegotiate = 0; 712 s->new_session = 0; 713 714 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 715 716 s->ctx->stats.sess_accept_good++; 717 /* s->server=1; */ 718 s->handshake_func = ssl3_accept; 719 720 ssl_info_callback(s, SSL_CB_HANDSHAKE_DONE, 1); 721 } 722 723 ret = 1; 724 725 if (SSL_is_dtls(s)) { 726 /* Done handshaking, next message is client hello. */ 727 s->d1->handshake_read_seq = 0; 728 /* Next message is server hello. */ 729 s->d1->handshake_write_seq = 0; 730 s->d1->next_handshake_write_seq = 0; 731 } 732 goto end; 733 /* break; */ 734 735 default: 736 SSLerror(s, SSL_R_UNKNOWN_STATE); 737 ret = -1; 738 goto end; 739 /* break; */ 740 } 741 742 if (!s->s3->hs.tls12.reuse_message && !skip) { 743 if (s->debug) { 744 if ((ret = BIO_flush(s->wbio)) <= 0) 745 goto end; 746 } 747 748 749 if (s->s3->hs.state != state) { 750 new_state = s->s3->hs.state; 751 s->s3->hs.state = state; 752 ssl_info_callback(s, SSL_CB_ACCEPT_LOOP, 1); 753 s->s3->hs.state = new_state; 754 } 755 } 756 skip = 0; 757 } 758 end: 759 /* BIO_flush(s->wbio); */ 760 s->in_handshake--; 761 ssl_info_callback(s, SSL_CB_ACCEPT_EXIT, ret); 762 763 return (ret); 764 } 765 766 static int 767 ssl3_send_hello_request(SSL *s) 768 { 769 CBB cbb, hello; 770 771 memset(&cbb, 0, sizeof(cbb)); 772 773 if (s->s3->hs.state == SSL3_ST_SW_HELLO_REQ_A) { 774 if (!ssl3_handshake_msg_start(s, &cbb, &hello, 775 SSL3_MT_HELLO_REQUEST)) 776 goto err; 777 if (!ssl3_handshake_msg_finish(s, &cbb)) 778 goto err; 779 780 s->s3->hs.state = SSL3_ST_SW_HELLO_REQ_B; 781 } 782 783 /* SSL3_ST_SW_HELLO_REQ_B */ 784 return (ssl3_handshake_write(s)); 785 786 err: 787 CBB_cleanup(&cbb); 788 789 return (-1); 790 } 791 792 static int 793 ssl3_get_client_hello(SSL *s) 794 { 795 CBS cbs, client_random, session_id, cookie, cipher_suites; 796 CBS compression_methods; 797 uint16_t client_version; 798 uint8_t comp_method; 799 int comp_null; 800 int i, j, al, ret, cookie_valid = 0; 801 unsigned long id; 802 SSL_CIPHER *c; 803 STACK_OF(SSL_CIPHER) *ciphers = NULL; 804 unsigned long alg_k; 805 const SSL_METHOD *method; 806 uint16_t shared_version; 807 808 /* 809 * We do this so that we will respond with our native type. 810 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, 811 * This down switching should be handled by a different method. 812 * If we are SSLv3, we will respond with SSLv3, even if prompted with 813 * TLSv1. 814 */ 815 if (s->s3->hs.state == SSL3_ST_SR_CLNT_HELLO_A) 816 s->s3->hs.state = SSL3_ST_SR_CLNT_HELLO_B; 817 818 s->first_packet = 1; 819 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, 820 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, 821 SSL3_RT_MAX_PLAIN_LENGTH)) <= 0) 822 return ret; 823 s->first_packet = 0; 824 825 ret = -1; 826 827 if (s->init_num < 0) 828 goto err; 829 830 CBS_init(&cbs, s->init_msg, s->init_num); 831 832 /* Parse client hello up until the extensions (if any). */ 833 if (!CBS_get_u16(&cbs, &client_version)) 834 goto decode_err; 835 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE)) 836 goto decode_err; 837 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 838 goto decode_err; 839 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 840 al = SSL_AD_ILLEGAL_PARAMETER; 841 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 842 goto fatal_err; 843 } 844 if (SSL_is_dtls(s)) { 845 if (!CBS_get_u8_length_prefixed(&cbs, &cookie)) 846 goto decode_err; 847 } 848 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites)) 849 goto decode_err; 850 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods)) 851 goto decode_err; 852 853 /* 854 * Use version from inside client hello, not from record header. 855 * (may differ: see RFC 2246, Appendix E, second paragraph) 856 */ 857 if (!ssl_max_shared_version(s, client_version, &shared_version)) { 858 if ((client_version >> 8) == SSL3_VERSION_MAJOR && 859 !tls12_record_layer_write_protected(s->rl)) { 860 /* 861 * Similar to ssl3_get_record, send alert using remote 862 * version number. 863 */ 864 s->version = client_version; 865 } 866 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER); 867 al = SSL_AD_PROTOCOL_VERSION; 868 goto fatal_err; 869 } 870 s->s3->hs.peer_legacy_version = client_version; 871 s->version = shared_version; 872 873 s->s3->hs.negotiated_tls_version = ssl_tls_version(shared_version); 874 if (s->s3->hs.negotiated_tls_version == 0) { 875 SSLerror(s, ERR_R_INTERNAL_ERROR); 876 goto err; 877 } 878 879 if ((method = ssl_get_method(shared_version)) == NULL) { 880 SSLerror(s, ERR_R_INTERNAL_ERROR); 881 goto err; 882 } 883 s->method = method; 884 885 /* 886 * If we require cookies (DTLS) and this ClientHello does not contain 887 * one, just return since we do not want to allocate any memory yet. 888 * So check cookie length... 889 */ 890 if (SSL_is_dtls(s)) { 891 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 892 if (CBS_len(&cookie) == 0) 893 return (1); 894 } 895 } 896 897 if (!CBS_write_bytes(&client_random, s->s3->client_random, 898 sizeof(s->s3->client_random), NULL)) 899 goto err; 900 901 s->hit = 0; 902 903 /* 904 * Versions before 0.9.7 always allow clients to resume sessions in 905 * renegotiation. 0.9.7 and later allow this by default, but optionally 906 * ignore resumption requests with flag 907 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag 908 * rather than a change to default behavior so that applications 909 * relying on this for security won't even compile against older 910 * library versions). 911 * 912 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() 913 * to request renegotiation but not a new session (s->new_session 914 * remains unset): for servers, this essentially just means that the 915 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be 916 * ignored. 917 */ 918 if ((s->new_session && (s->options & 919 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { 920 if (!ssl_get_new_session(s, 1)) 921 goto err; 922 } else { 923 CBS ext_block; 924 925 CBS_dup(&cbs, &ext_block); 926 927 i = ssl_get_prev_session(s, &session_id, &ext_block, &al); 928 if (i == 1) { /* previous session */ 929 s->hit = 1; 930 } else if (i == -1) 931 goto fatal_err; 932 else { 933 /* i == 0 */ 934 if (!ssl_get_new_session(s, 1)) 935 goto err; 936 } 937 } 938 939 if (SSL_is_dtls(s)) { 940 /* 941 * The ClientHello may contain a cookie even if the HelloVerify 942 * message has not been sent - make sure that it does not cause 943 * an overflow. 944 */ 945 if (CBS_len(&cookie) > sizeof(s->d1->rcvd_cookie)) { 946 al = SSL_AD_DECODE_ERROR; 947 SSLerror(s, SSL_R_COOKIE_MISMATCH); 948 goto fatal_err; 949 } 950 951 /* Verify the cookie if appropriate option is set. */ 952 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && 953 CBS_len(&cookie) > 0) { 954 size_t cookie_len; 955 956 /* XXX - rcvd_cookie seems to only be used here... */ 957 if (!CBS_write_bytes(&cookie, s->d1->rcvd_cookie, 958 sizeof(s->d1->rcvd_cookie), &cookie_len)) 959 goto err; 960 961 if (s->ctx->app_verify_cookie_cb != NULL) { 962 if (s->ctx->app_verify_cookie_cb(s, 963 s->d1->rcvd_cookie, cookie_len) == 0) { 964 al = SSL_AD_HANDSHAKE_FAILURE; 965 SSLerror(s, SSL_R_COOKIE_MISMATCH); 966 goto fatal_err; 967 } 968 /* else cookie verification succeeded */ 969 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */ 970 } else if (timingsafe_memcmp(s->d1->rcvd_cookie, 971 s->d1->cookie, s->d1->cookie_len) != 0) { 972 /* default verification */ 973 al = SSL_AD_HANDSHAKE_FAILURE; 974 SSLerror(s, SSL_R_COOKIE_MISMATCH); 975 goto fatal_err; 976 } 977 cookie_valid = 1; 978 } 979 } 980 981 /* XXX - This logic seems wrong... */ 982 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) { 983 /* we need a cipher if we are not resuming a session */ 984 al = SSL_AD_ILLEGAL_PARAMETER; 985 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED); 986 goto fatal_err; 987 } 988 989 if (CBS_len(&cipher_suites) > 0) { 990 if ((ciphers = ssl_bytes_to_cipher_list(s, 991 &cipher_suites)) == NULL) 992 goto err; 993 } 994 995 /* If it is a hit, check that the cipher is in the list */ 996 /* XXX - CBS_len(&cipher_suites) will always be zero here... */ 997 if (s->hit && CBS_len(&cipher_suites) > 0) { 998 j = 0; 999 id = s->session->cipher->id; 1000 1001 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 1002 c = sk_SSL_CIPHER_value(ciphers, i); 1003 if (c->id == id) { 1004 j = 1; 1005 break; 1006 } 1007 } 1008 if (j == 0) { 1009 /* 1010 * We need to have the cipher in the cipher 1011 * list if we are asked to reuse it 1012 */ 1013 al = SSL_AD_ILLEGAL_PARAMETER; 1014 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING); 1015 goto fatal_err; 1016 } 1017 } 1018 1019 comp_null = 0; 1020 while (CBS_len(&compression_methods) > 0) { 1021 if (!CBS_get_u8(&compression_methods, &comp_method)) 1022 goto decode_err; 1023 if (comp_method == 0) 1024 comp_null = 1; 1025 } 1026 if (comp_null == 0) { 1027 al = SSL_AD_DECODE_ERROR; 1028 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED); 1029 goto fatal_err; 1030 } 1031 1032 if (!tlsext_server_parse(s, SSL_TLSEXT_MSG_CH, &cbs, &al)) { 1033 SSLerror(s, SSL_R_PARSE_TLSEXT); 1034 goto fatal_err; 1035 } 1036 1037 if (CBS_len(&cbs) != 0) 1038 goto decode_err; 1039 1040 if (!s->s3->renegotiate_seen && s->renegotiate) { 1041 al = SSL_AD_HANDSHAKE_FAILURE; 1042 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1043 goto fatal_err; 1044 } 1045 1046 if (ssl_check_clienthello_tlsext_early(s) <= 0) { 1047 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1048 goto err; 1049 } 1050 1051 /* 1052 * Check if we want to use external pre-shared secret for this 1053 * handshake for not reused session only. We need to generate 1054 * server_random before calling tls_session_secret_cb in order to allow 1055 * SessionTicket processing to use it in key derivation. 1056 */ 1057 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE); 1058 1059 if (s->s3->hs.our_max_tls_version >= TLS1_2_VERSION && 1060 s->s3->hs.negotiated_tls_version < s->s3->hs.our_max_tls_version) { 1061 /* 1062 * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3 1063 * we must set the last 8 bytes of the server random to magical 1064 * values to indicate we meant to downgrade. For TLS 1.2 it is 1065 * recommended that we do the same. 1066 */ 1067 size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12); 1068 uint8_t *magic = &s->s3->server_random[index]; 1069 if (s->s3->hs.negotiated_tls_version == TLS1_2_VERSION) { 1070 /* Indicate we chose to downgrade to 1.2. */ 1071 memcpy(magic, tls13_downgrade_12, 1072 sizeof(tls13_downgrade_12)); 1073 } else { 1074 /* Indicate we chose to downgrade to 1.1 or lower */ 1075 memcpy(magic, tls13_downgrade_11, 1076 sizeof(tls13_downgrade_11)); 1077 } 1078 } 1079 1080 if (!s->hit && s->tls_session_secret_cb != NULL) { 1081 SSL_CIPHER *pref_cipher = NULL; 1082 int master_key_length = sizeof(s->session->master_key); 1083 1084 if (!s->tls_session_secret_cb(s, 1085 s->session->master_key, &master_key_length, ciphers, 1086 &pref_cipher, s->tls_session_secret_cb_arg)) { 1087 SSLerror(s, ERR_R_INTERNAL_ERROR); 1088 goto err; 1089 } 1090 if (master_key_length <= 0) { 1091 SSLerror(s, ERR_R_INTERNAL_ERROR); 1092 goto err; 1093 } 1094 s->session->master_key_length = master_key_length; 1095 1096 s->hit = 1; 1097 s->session->verify_result = X509_V_OK; 1098 1099 sk_SSL_CIPHER_free(s->session->ciphers); 1100 s->session->ciphers = ciphers; 1101 ciphers = NULL; 1102 1103 /* Check if some cipher was preferred by the callback. */ 1104 if (pref_cipher == NULL) 1105 pref_cipher = ssl3_choose_cipher(s, s->session->ciphers, 1106 SSL_get_ciphers(s)); 1107 if (pref_cipher == NULL) { 1108 al = SSL_AD_HANDSHAKE_FAILURE; 1109 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1110 goto fatal_err; 1111 } 1112 s->session->cipher = pref_cipher; 1113 1114 sk_SSL_CIPHER_free(s->cipher_list); 1115 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); 1116 } 1117 1118 /* 1119 * Given s->session->ciphers and SSL_get_ciphers, we must 1120 * pick a cipher 1121 */ 1122 1123 if (!s->hit) { 1124 if (ciphers == NULL) { 1125 al = SSL_AD_ILLEGAL_PARAMETER; 1126 SSLerror(s, SSL_R_NO_CIPHERS_PASSED); 1127 goto fatal_err; 1128 } 1129 sk_SSL_CIPHER_free(s->session->ciphers); 1130 s->session->ciphers = ciphers; 1131 ciphers = NULL; 1132 1133 if ((c = ssl3_choose_cipher(s, s->session->ciphers, 1134 SSL_get_ciphers(s))) == NULL) { 1135 al = SSL_AD_HANDSHAKE_FAILURE; 1136 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1137 goto fatal_err; 1138 } 1139 s->s3->hs.cipher = c; 1140 } else { 1141 s->s3->hs.cipher = s->session->cipher; 1142 } 1143 1144 if (!tls1_transcript_hash_init(s)) 1145 goto err; 1146 1147 alg_k = s->s3->hs.cipher->algorithm_mkey; 1148 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) || 1149 !(s->verify_mode & SSL_VERIFY_PEER)) 1150 tls1_transcript_free(s); 1151 1152 /* 1153 * We now have the following setup. 1154 * client_random 1155 * cipher_list - our preferred list of ciphers 1156 * ciphers - the clients preferred list of ciphers 1157 * compression - basically ignored right now 1158 * ssl version is set - sslv3 1159 * s->session - The ssl session has been setup. 1160 * s->hit - session reuse flag 1161 * s->hs.cipher - the new cipher to use. 1162 */ 1163 1164 /* Handles TLS extensions that we couldn't check earlier */ 1165 if (ssl_check_clienthello_tlsext_late(s) <= 0) { 1166 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1167 goto err; 1168 } 1169 1170 ret = cookie_valid ? 2 : 1; 1171 1172 if (0) { 1173 decode_err: 1174 al = SSL_AD_DECODE_ERROR; 1175 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1176 fatal_err: 1177 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1178 } 1179 err: 1180 sk_SSL_CIPHER_free(ciphers); 1181 1182 return (ret); 1183 } 1184 1185 static int 1186 ssl3_send_dtls_hello_verify_request(SSL *s) 1187 { 1188 CBB cbb, verify, cookie; 1189 1190 memset(&cbb, 0, sizeof(cbb)); 1191 1192 if (s->s3->hs.state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 1193 if (s->ctx->app_gen_cookie_cb == NULL || 1194 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 1195 &(s->d1->cookie_len)) == 0) { 1196 SSLerror(s, ERR_R_INTERNAL_ERROR); 1197 return 0; 1198 } 1199 1200 /* 1201 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should 1202 * always contain DTLSv1.0 regardless of the version that is 1203 * going to be negotiated. 1204 */ 1205 if (!ssl3_handshake_msg_start(s, &cbb, &verify, 1206 DTLS1_MT_HELLO_VERIFY_REQUEST)) 1207 goto err; 1208 if (!CBB_add_u16(&verify, DTLS1_VERSION)) 1209 goto err; 1210 if (!CBB_add_u8_length_prefixed(&verify, &cookie)) 1211 goto err; 1212 if (!CBB_add_bytes(&cookie, s->d1->cookie, s->d1->cookie_len)) 1213 goto err; 1214 if (!ssl3_handshake_msg_finish(s, &cbb)) 1215 goto err; 1216 1217 s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 1218 } 1219 1220 /* s->s3->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 1221 return (ssl3_handshake_write(s)); 1222 1223 err: 1224 CBB_cleanup(&cbb); 1225 1226 return (-1); 1227 } 1228 1229 static int 1230 ssl3_send_server_hello(SSL *s) 1231 { 1232 CBB cbb, server_hello, session_id; 1233 size_t sl; 1234 1235 memset(&cbb, 0, sizeof(cbb)); 1236 1237 if (s->s3->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 1238 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello, 1239 SSL3_MT_SERVER_HELLO)) 1240 goto err; 1241 1242 if (!CBB_add_u16(&server_hello, s->version)) 1243 goto err; 1244 if (!CBB_add_bytes(&server_hello, s->s3->server_random, 1245 sizeof(s->s3->server_random))) 1246 goto err; 1247 1248 /* 1249 * There are several cases for the session ID to send 1250 * back in the server hello: 1251 * 1252 * - For session reuse from the session cache, 1253 * we send back the old session ID. 1254 * - If stateless session reuse (using a session ticket) 1255 * is successful, we send back the client's "session ID" 1256 * (which doesn't actually identify the session). 1257 * - If it is a new session, we send back the new 1258 * session ID. 1259 * - However, if we want the new session to be single-use, 1260 * we send back a 0-length session ID. 1261 * 1262 * s->hit is non-zero in either case of session reuse, 1263 * so the following won't overwrite an ID that we're supposed 1264 * to send back. 1265 */ 1266 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER) 1267 && !s->hit) 1268 s->session->session_id_length = 0; 1269 1270 sl = s->session->session_id_length; 1271 if (sl > sizeof(s->session->session_id)) { 1272 SSLerror(s, ERR_R_INTERNAL_ERROR); 1273 goto err; 1274 } 1275 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) 1276 goto err; 1277 if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) 1278 goto err; 1279 1280 /* Cipher suite. */ 1281 if (!CBB_add_u16(&server_hello, 1282 ssl3_cipher_get_value(s->s3->hs.cipher))) 1283 goto err; 1284 1285 /* Compression method (null). */ 1286 if (!CBB_add_u8(&server_hello, 0)) 1287 goto err; 1288 1289 /* TLS extensions */ 1290 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) { 1291 SSLerror(s, ERR_R_INTERNAL_ERROR); 1292 goto err; 1293 } 1294 1295 if (!ssl3_handshake_msg_finish(s, &cbb)) 1296 goto err; 1297 } 1298 1299 /* SSL3_ST_SW_SRVR_HELLO_B */ 1300 return (ssl3_handshake_write(s)); 1301 1302 err: 1303 CBB_cleanup(&cbb); 1304 1305 return (-1); 1306 } 1307 1308 static int 1309 ssl3_send_server_done(SSL *s) 1310 { 1311 CBB cbb, done; 1312 1313 memset(&cbb, 0, sizeof(cbb)); 1314 1315 if (s->s3->hs.state == SSL3_ST_SW_SRVR_DONE_A) { 1316 if (!ssl3_handshake_msg_start(s, &cbb, &done, 1317 SSL3_MT_SERVER_DONE)) 1318 goto err; 1319 if (!ssl3_handshake_msg_finish(s, &cbb)) 1320 goto err; 1321 1322 s->s3->hs.state = SSL3_ST_SW_SRVR_DONE_B; 1323 } 1324 1325 /* SSL3_ST_SW_SRVR_DONE_B */ 1326 return (ssl3_handshake_write(s)); 1327 1328 err: 1329 CBB_cleanup(&cbb); 1330 1331 return (-1); 1332 } 1333 1334 static int 1335 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) 1336 { 1337 int nid = NID_dhKeyAgreement; 1338 1339 tls_key_share_free(s->s3->hs.key_share); 1340 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1341 goto err; 1342 1343 if (s->cert->dhe_params_auto != 0) { 1344 size_t key_bits; 1345 1346 if ((key_bits = ssl_dhe_params_auto_key_bits(s)) == 0) { 1347 SSLerror(s, ERR_R_INTERNAL_ERROR); 1348 ssl3_send_alert(s, SSL3_AL_FATAL, 1349 SSL_AD_INTERNAL_ERROR); 1350 goto err; 1351 } 1352 tls_key_share_set_key_bits(s->s3->hs.key_share, 1353 key_bits); 1354 } else { 1355 DH *dh_params = s->cert->dhe_params; 1356 1357 if (dh_params == NULL && s->cert->dhe_params_cb != NULL) 1358 dh_params = s->cert->dhe_params_cb(s, 0, 1359 SSL_C_PKEYLENGTH(s->s3->hs.cipher)); 1360 1361 if (dh_params == NULL) { 1362 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1363 ssl3_send_alert(s, SSL3_AL_FATAL, 1364 SSL_AD_HANDSHAKE_FAILURE); 1365 goto err; 1366 } 1367 1368 if (!tls_key_share_set_dh_params(s->s3->hs.key_share, dh_params)) 1369 goto err; 1370 } 1371 1372 if (!tls_key_share_generate(s->s3->hs.key_share)) 1373 goto err; 1374 1375 if (!tls_key_share_params(s->s3->hs.key_share, cbb)) 1376 goto err; 1377 if (!tls_key_share_public(s->s3->hs.key_share, cbb)) 1378 goto err; 1379 1380 if (!tls_key_share_peer_security(s, s->s3->hs.key_share)) { 1381 SSLerror(s, SSL_R_DH_KEY_TOO_SMALL); 1382 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1383 return 0; 1384 } 1385 1386 return 1; 1387 1388 err: 1389 return 0; 1390 } 1391 1392 static int 1393 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) 1394 { 1395 CBB public; 1396 int nid; 1397 1398 if (!tls1_get_supported_group(s, &nid)) { 1399 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1400 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1401 goto err; 1402 } 1403 1404 tls_key_share_free(s->s3->hs.key_share); 1405 if ((s->s3->hs.key_share = tls_key_share_new_nid(nid)) == NULL) 1406 goto err; 1407 1408 if (!tls_key_share_generate(s->s3->hs.key_share)) 1409 goto err; 1410 1411 /* 1412 * ECC key exchange - see RFC 8422, section 5.4. 1413 */ 1414 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1415 goto err; 1416 if (!CBB_add_u16(cbb, tls_key_share_group(s->s3->hs.key_share))) 1417 goto err; 1418 if (!CBB_add_u8_length_prefixed(cbb, &public)) 1419 goto err; 1420 if (!tls_key_share_public(s->s3->hs.key_share, &public)) 1421 goto err; 1422 if (!CBB_flush(cbb)) 1423 goto err; 1424 1425 return 1; 1426 1427 err: 1428 return 0; 1429 } 1430 1431 static int 1432 ssl3_send_server_key_exchange(SSL *s) 1433 { 1434 CBB cbb, cbb_signature, cbb_signed_params, server_kex; 1435 CBS params; 1436 const struct ssl_sigalg *sigalg = NULL; 1437 unsigned char *signed_params = NULL; 1438 size_t signed_params_len; 1439 unsigned char *signature = NULL; 1440 size_t signature_len = 0; 1441 const EVP_MD *md = NULL; 1442 unsigned long type; 1443 EVP_MD_CTX *md_ctx = NULL; 1444 EVP_PKEY_CTX *pctx; 1445 EVP_PKEY *pkey; 1446 int al; 1447 1448 memset(&cbb, 0, sizeof(cbb)); 1449 memset(&cbb_signed_params, 0, sizeof(cbb_signed_params)); 1450 1451 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 1452 goto err; 1453 1454 if (s->s3->hs.state == SSL3_ST_SW_KEY_EXCH_A) { 1455 1456 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex, 1457 SSL3_MT_SERVER_KEY_EXCHANGE)) 1458 goto err; 1459 1460 if (!CBB_init(&cbb_signed_params, 0)) 1461 goto err; 1462 1463 if (!CBB_add_bytes(&cbb_signed_params, s->s3->client_random, 1464 SSL3_RANDOM_SIZE)) { 1465 SSLerror(s, ERR_R_INTERNAL_ERROR); 1466 goto err; 1467 } 1468 if (!CBB_add_bytes(&cbb_signed_params, s->s3->server_random, 1469 SSL3_RANDOM_SIZE)) { 1470 SSLerror(s, ERR_R_INTERNAL_ERROR); 1471 goto err; 1472 } 1473 1474 type = s->s3->hs.cipher->algorithm_mkey; 1475 if (type & SSL_kDHE) { 1476 if (!ssl3_send_server_kex_dhe(s, &cbb_signed_params)) 1477 goto err; 1478 } else if (type & SSL_kECDHE) { 1479 if (!ssl3_send_server_kex_ecdhe(s, &cbb_signed_params)) 1480 goto err; 1481 } else { 1482 al = SSL_AD_HANDSHAKE_FAILURE; 1483 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1484 goto fatal_err; 1485 } 1486 1487 if (!CBB_finish(&cbb_signed_params, &signed_params, 1488 &signed_params_len)) 1489 goto err; 1490 1491 CBS_init(¶ms, signed_params, signed_params_len); 1492 if (!CBS_skip(¶ms, 2 * SSL3_RANDOM_SIZE)) 1493 goto err; 1494 1495 if (!CBB_add_bytes(&server_kex, CBS_data(¶ms), 1496 CBS_len(¶ms))) 1497 goto err; 1498 1499 /* Add signature unless anonymous. */ 1500 if (!(s->s3->hs.cipher->algorithm_auth & SSL_aNULL)) { 1501 if ((pkey = ssl_get_sign_pkey(s, s->s3->hs.cipher, 1502 &md, &sigalg)) == NULL) { 1503 al = SSL_AD_DECODE_ERROR; 1504 goto fatal_err; 1505 } 1506 s->s3->hs.our_sigalg = sigalg; 1507 1508 /* Send signature algorithm. */ 1509 if (SSL_USE_SIGALGS(s)) { 1510 if (!CBB_add_u16(&server_kex, sigalg->value)) { 1511 al = SSL_AD_INTERNAL_ERROR; 1512 SSLerror(s, ERR_R_INTERNAL_ERROR); 1513 goto fatal_err; 1514 } 1515 } 1516 1517 if (!EVP_DigestSignInit(md_ctx, &pctx, md, NULL, pkey)) { 1518 SSLerror(s, ERR_R_EVP_LIB); 1519 goto err; 1520 } 1521 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1522 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1523 RSA_PKCS1_PSS_PADDING) || 1524 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1525 SSLerror(s, ERR_R_EVP_LIB); 1526 goto err; 1527 } 1528 if (!EVP_DigestSign(md_ctx, NULL, &signature_len, 1529 signed_params, signed_params_len)) { 1530 SSLerror(s, ERR_R_EVP_LIB); 1531 goto err; 1532 } 1533 if ((signature = calloc(1, signature_len)) == NULL) { 1534 SSLerror(s, ERR_R_MALLOC_FAILURE); 1535 goto err; 1536 } 1537 if (!EVP_DigestSign(md_ctx, signature, &signature_len, 1538 signed_params, signed_params_len)) { 1539 SSLerror(s, ERR_R_EVP_LIB); 1540 goto err; 1541 } 1542 1543 if (!CBB_add_u16_length_prefixed(&server_kex, 1544 &cbb_signature)) 1545 goto err; 1546 if (!CBB_add_bytes(&cbb_signature, signature, 1547 signature_len)) 1548 goto err; 1549 } 1550 1551 if (!ssl3_handshake_msg_finish(s, &cbb)) 1552 goto err; 1553 1554 s->s3->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1555 } 1556 1557 EVP_MD_CTX_free(md_ctx); 1558 free(signature); 1559 free(signed_params); 1560 1561 return (ssl3_handshake_write(s)); 1562 1563 fatal_err: 1564 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1565 err: 1566 CBB_cleanup(&cbb_signed_params); 1567 CBB_cleanup(&cbb); 1568 EVP_MD_CTX_free(md_ctx); 1569 free(signature); 1570 free(signed_params); 1571 1572 return (-1); 1573 } 1574 1575 static int 1576 ssl3_send_certificate_request(SSL *s) 1577 { 1578 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1579 STACK_OF(X509_NAME) *sk = NULL; 1580 X509_NAME *name; 1581 int i; 1582 1583 /* 1584 * Certificate Request - RFC 5246 section 7.4.4. 1585 */ 1586 1587 memset(&cbb, 0, sizeof(cbb)); 1588 1589 if (s->s3->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1590 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, 1591 SSL3_MT_CERTIFICATE_REQUEST)) 1592 goto err; 1593 1594 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1595 goto err; 1596 if (!ssl3_get_req_cert_types(s, &cert_types)) 1597 goto err; 1598 1599 if (SSL_USE_SIGALGS(s)) { 1600 if (!CBB_add_u16_length_prefixed(&cert_request, 1601 &sigalgs)) 1602 goto err; 1603 if (!ssl_sigalgs_build(s->s3->hs.negotiated_tls_version, 1604 &sigalgs, SSL_get_security_level(s))) 1605 goto err; 1606 } 1607 1608 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) 1609 goto err; 1610 1611 sk = SSL_get_client_CA_list(s); 1612 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1613 unsigned char *name_data; 1614 size_t name_len; 1615 1616 name = sk_X509_NAME_value(sk, i); 1617 name_len = i2d_X509_NAME(name, NULL); 1618 1619 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) 1620 goto err; 1621 if (!CBB_add_space(&dn, &name_data, name_len)) 1622 goto err; 1623 if (i2d_X509_NAME(name, &name_data) != name_len) 1624 goto err; 1625 } 1626 1627 if (!ssl3_handshake_msg_finish(s, &cbb)) 1628 goto err; 1629 1630 s->s3->hs.state = SSL3_ST_SW_CERT_REQ_B; 1631 } 1632 1633 /* SSL3_ST_SW_CERT_REQ_B */ 1634 return (ssl3_handshake_write(s)); 1635 1636 err: 1637 CBB_cleanup(&cbb); 1638 1639 return (-1); 1640 } 1641 1642 static int 1643 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs) 1644 { 1645 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; 1646 unsigned char *pms = NULL; 1647 unsigned char *p; 1648 size_t pms_len = 0; 1649 EVP_PKEY *pkey = NULL; 1650 RSA *rsa = NULL; 1651 CBS enc_pms; 1652 int decrypt_len; 1653 int al = -1; 1654 1655 arc4random_buf(fakekey, sizeof(fakekey)); 1656 1657 fakekey[0] = s->s3->hs.peer_legacy_version >> 8; 1658 fakekey[1] = s->s3->hs.peer_legacy_version & 0xff; 1659 1660 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey; 1661 if (pkey == NULL || (rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 1662 al = SSL_AD_HANDSHAKE_FAILURE; 1663 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); 1664 goto fatal_err; 1665 } 1666 1667 pms_len = RSA_size(rsa); 1668 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH) 1669 goto err; 1670 if ((pms = malloc(pms_len)) == NULL) 1671 goto err; 1672 p = pms; 1673 1674 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms)) 1675 goto decode_err; 1676 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) { 1677 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1678 goto err; 1679 } 1680 1681 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms), 1682 pms, rsa, RSA_PKCS1_PADDING); 1683 1684 ERR_clear_error(); 1685 1686 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) { 1687 al = SSL_AD_DECODE_ERROR; 1688 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ 1689 } 1690 1691 if ((al == -1) && !((pms[0] == (s->s3->hs.peer_legacy_version >> 8)) && 1692 (pms[1] == (s->s3->hs.peer_legacy_version & 0xff)))) { 1693 /* 1694 * The premaster secret must contain the same version number 1695 * as the ClientHello to detect version rollback attacks 1696 * (strangely, the protocol does not offer such protection for 1697 * DH ciphersuites). 1698 * 1699 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack 1700 * (http://eprint.iacr.org/2003/052/) exploits the version 1701 * number check as a "bad version oracle" -- an alert would 1702 * reveal that the plaintext corresponding to some ciphertext 1703 * made up by the adversary is properly formatted except that 1704 * the version number is wrong. To avoid such attacks, we should 1705 * treat this just like any other decryption error. 1706 */ 1707 al = SSL_AD_DECODE_ERROR; 1708 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ 1709 } 1710 1711 if (al != -1) { 1712 /* 1713 * Some decryption failure -- use random value instead 1714 * as countermeasure against Bleichenbacher's attack 1715 * on PKCS #1 v1.5 RSA padding (see RFC 2246, 1716 * section 7.4.7.1). 1717 */ 1718 p = fakekey; 1719 } 1720 1721 if (!tls12_derive_master_secret(s, p, SSL_MAX_MASTER_KEY_LENGTH)) 1722 goto err; 1723 1724 freezero(pms, pms_len); 1725 1726 return 1; 1727 1728 decode_err: 1729 al = SSL_AD_DECODE_ERROR; 1730 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1731 fatal_err: 1732 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1733 err: 1734 freezero(pms, pms_len); 1735 1736 return 0; 1737 } 1738 1739 static int 1740 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) 1741 { 1742 uint8_t *key = NULL; 1743 size_t key_len = 0; 1744 int decode_error, invalid_key; 1745 int ret = 0; 1746 1747 if (s->s3->hs.key_share == NULL) { 1748 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1749 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1750 goto err; 1751 } 1752 1753 if (!tls_key_share_peer_public(s->s3->hs.key_share, cbs, 1754 &decode_error, &invalid_key)) { 1755 if (decode_error) { 1756 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1757 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1758 } 1759 goto err; 1760 } 1761 if (invalid_key) { 1762 SSLerror(s, SSL_R_BAD_DH_PUB_KEY_LENGTH); 1763 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER); 1764 goto err; 1765 } 1766 1767 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1768 goto err; 1769 1770 if (!tls12_derive_master_secret(s, key, key_len)) 1771 goto err; 1772 1773 ret = 1; 1774 1775 err: 1776 freezero(key, key_len); 1777 1778 return ret; 1779 } 1780 1781 static int 1782 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) 1783 { 1784 uint8_t *key = NULL; 1785 size_t key_len = 0; 1786 int decode_error; 1787 CBS public; 1788 int ret = 0; 1789 1790 if (s->s3->hs.key_share == NULL) { 1791 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 1792 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1793 goto err; 1794 } 1795 1796 if (!CBS_get_u8_length_prefixed(cbs, &public)) { 1797 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1798 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1799 goto err; 1800 } 1801 if (!tls_key_share_peer_public(s->s3->hs.key_share, &public, 1802 &decode_error, NULL)) { 1803 if (decode_error) { 1804 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1805 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1806 } 1807 goto err; 1808 } 1809 1810 if (!tls_key_share_derive(s->s3->hs.key_share, &key, &key_len)) 1811 goto err; 1812 1813 if (!tls12_derive_master_secret(s, key, key_len)) 1814 goto err; 1815 1816 ret = 1; 1817 1818 err: 1819 freezero(key, key_len); 1820 1821 return ret; 1822 } 1823 1824 static int 1825 ssl3_get_client_kex_gost(SSL *s, CBS *cbs) 1826 { 1827 unsigned char premaster_secret[32]; 1828 EVP_PKEY_CTX *pkey_ctx = NULL; 1829 EVP_PKEY *client_pubkey; 1830 EVP_PKEY *pkey = NULL; 1831 size_t outlen; 1832 CBS gostblob; 1833 1834 /* Get our certificate private key*/ 1835 if ((s->s3->hs.cipher->algorithm_auth & SSL_aGOST01) != 0) 1836 pkey = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 1837 1838 if ((pkey_ctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) 1839 goto err; 1840 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) 1841 goto err; 1842 1843 /* 1844 * If client certificate is present and is of the same type, 1845 * maybe use it for key exchange. 1846 * Don't mind errors from EVP_PKEY_derive_set_peer, because 1847 * it is completely valid to use a client certificate for 1848 * authorization only. 1849 */ 1850 if ((client_pubkey = X509_get0_pubkey(s->session->peer_cert)) != NULL) { 1851 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pubkey) <= 0) 1852 ERR_clear_error(); 1853 } 1854 1855 /* Decrypt session key */ 1856 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) 1857 goto decode_err; 1858 if (CBS_len(cbs) != 0) 1859 goto decode_err; 1860 outlen = sizeof(premaster_secret); 1861 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 1862 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { 1863 SSLerror(s, SSL_R_DECRYPTION_FAILED); 1864 goto err; 1865 } 1866 1867 if (!tls12_derive_master_secret(s, premaster_secret, 1868 sizeof(premaster_secret))) 1869 goto err; 1870 1871 /* Check if pubkey from client certificate was used */ 1872 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 1873 2, NULL) > 0) 1874 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY; 1875 1876 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 1877 EVP_PKEY_CTX_free(pkey_ctx); 1878 1879 return 1; 1880 1881 decode_err: 1882 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1883 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR); 1884 err: 1885 explicit_bzero(premaster_secret, sizeof(premaster_secret)); 1886 EVP_PKEY_CTX_free(pkey_ctx); 1887 1888 return 0; 1889 } 1890 1891 static int 1892 ssl3_get_client_key_exchange(SSL *s) 1893 { 1894 unsigned long alg_k; 1895 int al, ret; 1896 CBS cbs; 1897 1898 /* 2048 maxlen is a guess. How long a key does that permit? */ 1899 if ((ret = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 1900 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048)) <= 0) 1901 return ret; 1902 1903 if (s->init_num < 0) 1904 goto err; 1905 1906 CBS_init(&cbs, s->init_msg, s->init_num); 1907 1908 alg_k = s->s3->hs.cipher->algorithm_mkey; 1909 1910 if (alg_k & SSL_kRSA) { 1911 if (!ssl3_get_client_kex_rsa(s, &cbs)) 1912 goto err; 1913 } else if (alg_k & SSL_kDHE) { 1914 if (!ssl3_get_client_kex_dhe(s, &cbs)) 1915 goto err; 1916 } else if (alg_k & SSL_kECDHE) { 1917 if (!ssl3_get_client_kex_ecdhe(s, &cbs)) 1918 goto err; 1919 } else if (alg_k & SSL_kGOST) { 1920 if (!ssl3_get_client_kex_gost(s, &cbs)) 1921 goto err; 1922 } else { 1923 al = SSL_AD_HANDSHAKE_FAILURE; 1924 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 1925 goto fatal_err; 1926 } 1927 1928 if (CBS_len(&cbs) != 0) { 1929 al = SSL_AD_DECODE_ERROR; 1930 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1931 goto fatal_err; 1932 } 1933 1934 return (1); 1935 1936 fatal_err: 1937 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1938 err: 1939 return (-1); 1940 } 1941 1942 static int 1943 ssl3_get_cert_verify(SSL *s) 1944 { 1945 CBS cbs, signature; 1946 const struct ssl_sigalg *sigalg = NULL; 1947 uint16_t sigalg_value = SIGALG_NONE; 1948 EVP_PKEY *pkey; 1949 X509 *peer_cert = NULL; 1950 EVP_MD_CTX *mctx = NULL; 1951 int al, verify; 1952 const unsigned char *hdata; 1953 size_t hdatalen; 1954 int type = 0; 1955 int ret; 1956 1957 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 1958 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH)) <= 0) 1959 return ret; 1960 1961 ret = 0; 1962 1963 if (s->init_num < 0) 1964 goto err; 1965 1966 if ((mctx = EVP_MD_CTX_new()) == NULL) 1967 goto err; 1968 1969 CBS_init(&cbs, s->init_msg, s->init_num); 1970 1971 peer_cert = s->session->peer_cert; 1972 pkey = X509_get0_pubkey(peer_cert); 1973 type = X509_certificate_type(peer_cert, pkey); 1974 1975 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 1976 s->s3->hs.tls12.reuse_message = 1; 1977 if (peer_cert != NULL) { 1978 al = SSL_AD_UNEXPECTED_MESSAGE; 1979 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 1980 goto fatal_err; 1981 } 1982 ret = 1; 1983 goto end; 1984 } 1985 1986 if (peer_cert == NULL) { 1987 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 1988 al = SSL_AD_UNEXPECTED_MESSAGE; 1989 goto fatal_err; 1990 } 1991 1992 if (!(type & EVP_PKT_SIGN)) { 1993 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 1994 al = SSL_AD_ILLEGAL_PARAMETER; 1995 goto fatal_err; 1996 } 1997 1998 if (s->s3->change_cipher_spec) { 1999 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 2000 al = SSL_AD_UNEXPECTED_MESSAGE; 2001 goto fatal_err; 2002 } 2003 2004 if (SSL_USE_SIGALGS(s)) { 2005 if (!CBS_get_u16(&cbs, &sigalg_value)) 2006 goto decode_err; 2007 } 2008 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2009 goto err; 2010 if (CBS_len(&cbs) != 0) { 2011 al = SSL_AD_DECODE_ERROR; 2012 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2013 goto fatal_err; 2014 } 2015 2016 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2017 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2018 al = SSL_AD_DECODE_ERROR; 2019 goto fatal_err; 2020 } 2021 2022 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 2023 sigalg_value)) == NULL) { 2024 al = SSL_AD_DECODE_ERROR; 2025 goto fatal_err; 2026 } 2027 s->s3->hs.peer_sigalg = sigalg; 2028 2029 if (SSL_USE_SIGALGS(s)) { 2030 EVP_PKEY_CTX *pctx; 2031 2032 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2033 SSLerror(s, ERR_R_INTERNAL_ERROR); 2034 al = SSL_AD_INTERNAL_ERROR; 2035 goto fatal_err; 2036 } 2037 if (!EVP_DigestVerifyInit(mctx, &pctx, sigalg->md(), 2038 NULL, pkey)) { 2039 SSLerror(s, ERR_R_EVP_LIB); 2040 al = SSL_AD_INTERNAL_ERROR; 2041 goto fatal_err; 2042 } 2043 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2044 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 2045 RSA_PKCS1_PSS_PADDING) || 2046 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2047 al = SSL_AD_INTERNAL_ERROR; 2048 goto fatal_err; 2049 } 2050 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2051 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2052 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, 2053 NULL) <= 0) { 2054 al = SSL_AD_INTERNAL_ERROR; 2055 goto fatal_err; 2056 } 2057 if (EVP_DigestVerify(mctx, CBS_data(&signature), 2058 CBS_len(&signature), hdata, hdatalen) <= 0) { 2059 SSLerror(s, ERR_R_EVP_LIB); 2060 al = SSL_AD_INTERNAL_ERROR; 2061 goto fatal_err; 2062 } 2063 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) { 2064 RSA *rsa; 2065 2066 if ((rsa = EVP_PKEY_get0_RSA(pkey)) == NULL) { 2067 al = SSL_AD_INTERNAL_ERROR; 2068 SSLerror(s, ERR_R_EVP_LIB); 2069 goto fatal_err; 2070 } 2071 verify = RSA_verify(NID_md5_sha1, s->s3->hs.tls12.cert_verify, 2072 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), 2073 CBS_len(&signature), rsa); 2074 if (verify < 0) { 2075 al = SSL_AD_DECRYPT_ERROR; 2076 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2077 goto fatal_err; 2078 } 2079 if (verify == 0) { 2080 al = SSL_AD_DECRYPT_ERROR; 2081 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2082 goto fatal_err; 2083 } 2084 } else if (EVP_PKEY_id(pkey) == EVP_PKEY_EC) { 2085 EC_KEY *eckey; 2086 2087 if ((eckey = EVP_PKEY_get0_EC_KEY(pkey)) == NULL) { 2088 al = SSL_AD_INTERNAL_ERROR; 2089 SSLerror(s, ERR_R_EVP_LIB); 2090 goto fatal_err; 2091 } 2092 verify = ECDSA_verify(0, 2093 &(s->s3->hs.tls12.cert_verify[MD5_DIGEST_LENGTH]), 2094 SHA_DIGEST_LENGTH, CBS_data(&signature), 2095 CBS_len(&signature), eckey); 2096 if (verify <= 0) { 2097 al = SSL_AD_DECRYPT_ERROR; 2098 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2099 goto fatal_err; 2100 } 2101 #ifndef OPENSSL_NO_GOST 2102 } else if (EVP_PKEY_id(pkey) == NID_id_GostR3410_94 || 2103 EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) { 2104 unsigned char sigbuf[128]; 2105 unsigned int siglen = sizeof(sigbuf); 2106 EVP_PKEY_CTX *pctx; 2107 const EVP_MD *md; 2108 int nid; 2109 2110 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2111 SSLerror(s, ERR_R_INTERNAL_ERROR); 2112 al = SSL_AD_INTERNAL_ERROR; 2113 goto fatal_err; 2114 } 2115 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2116 !(md = EVP_get_digestbynid(nid))) { 2117 SSLerror(s, ERR_R_EVP_LIB); 2118 al = SSL_AD_INTERNAL_ERROR; 2119 goto fatal_err; 2120 } 2121 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 2122 SSLerror(s, ERR_R_EVP_LIB); 2123 al = SSL_AD_INTERNAL_ERROR; 2124 goto fatal_err; 2125 } 2126 if (!EVP_DigestInit_ex(mctx, md, NULL) || 2127 !EVP_DigestUpdate(mctx, hdata, hdatalen) || 2128 !EVP_DigestFinal(mctx, sigbuf, &siglen) || 2129 (EVP_PKEY_verify_init(pctx) <= 0) || 2130 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2131 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2132 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2133 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { 2134 SSLerror(s, ERR_R_EVP_LIB); 2135 al = SSL_AD_INTERNAL_ERROR; 2136 EVP_PKEY_CTX_free(pctx); 2137 goto fatal_err; 2138 } 2139 if (EVP_PKEY_verify(pctx, CBS_data(&signature), 2140 CBS_len(&signature), sigbuf, siglen) <= 0) { 2141 al = SSL_AD_DECRYPT_ERROR; 2142 SSLerror(s, SSL_R_BAD_SIGNATURE); 2143 EVP_PKEY_CTX_free(pctx); 2144 goto fatal_err; 2145 } 2146 2147 EVP_PKEY_CTX_free(pctx); 2148 #endif 2149 } else { 2150 SSLerror(s, ERR_R_INTERNAL_ERROR); 2151 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2152 goto fatal_err; 2153 } 2154 2155 ret = 1; 2156 if (0) { 2157 decode_err: 2158 al = SSL_AD_DECODE_ERROR; 2159 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2160 fatal_err: 2161 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2162 } 2163 end: 2164 tls1_transcript_free(s); 2165 err: 2166 EVP_MD_CTX_free(mctx); 2167 2168 return (ret); 2169 } 2170 2171 static int 2172 ssl3_get_client_certificate(SSL *s) 2173 { 2174 CBS cbs, cert_list, cert_data; 2175 STACK_OF(X509) *certs = NULL; 2176 X509 *cert = NULL; 2177 const uint8_t *p; 2178 int al, ret; 2179 2180 if ((ret = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2181 -1, s->max_cert_list)) <= 0) 2182 return ret; 2183 2184 ret = -1; 2185 2186 if (s->s3->hs.tls12.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2187 if ((s->verify_mode & SSL_VERIFY_PEER) && 2188 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2189 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2190 al = SSL_AD_HANDSHAKE_FAILURE; 2191 goto fatal_err; 2192 } 2193 2194 /* 2195 * If we asked for a client certificate and the client has none, 2196 * it must respond with a certificate list of length zero. 2197 */ 2198 if (s->s3->hs.tls12.cert_request != 0) { 2199 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST); 2200 al = SSL_AD_UNEXPECTED_MESSAGE; 2201 goto fatal_err; 2202 } 2203 s->s3->hs.tls12.reuse_message = 1; 2204 return (1); 2205 } 2206 2207 if (s->s3->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 2208 al = SSL_AD_UNEXPECTED_MESSAGE; 2209 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2210 goto fatal_err; 2211 } 2212 2213 if (s->init_num < 0) 2214 goto decode_err; 2215 2216 CBS_init(&cbs, s->init_msg, s->init_num); 2217 2218 if (!CBS_get_u24_length_prefixed(&cbs, &cert_list)) 2219 goto decode_err; 2220 if (CBS_len(&cbs) != 0) 2221 goto decode_err; 2222 2223 /* 2224 * A TLS client must send an empty certificate list, if no suitable 2225 * certificate is available (rather than omitting the Certificate 2226 * handshake message) - see RFC 5246 section 7.4.6. 2227 */ 2228 if (CBS_len(&cert_list) == 0) { 2229 if ((s->verify_mode & SSL_VERIFY_PEER) && 2230 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2231 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2232 al = SSL_AD_HANDSHAKE_FAILURE; 2233 goto fatal_err; 2234 } 2235 /* No client certificate so free transcript. */ 2236 tls1_transcript_free(s); 2237 goto done; 2238 } 2239 2240 if ((certs = sk_X509_new_null()) == NULL) { 2241 SSLerror(s, ERR_R_MALLOC_FAILURE); 2242 goto err; 2243 } 2244 2245 while (CBS_len(&cert_list) > 0) { 2246 if (!CBS_get_u24_length_prefixed(&cert_list, &cert_data)) 2247 goto decode_err; 2248 p = CBS_data(&cert_data); 2249 if ((cert = d2i_X509(NULL, &p, CBS_len(&cert_data))) == NULL) { 2250 SSLerror(s, ERR_R_ASN1_LIB); 2251 goto err; 2252 } 2253 if (p != CBS_data(&cert_data) + CBS_len(&cert_data)) 2254 goto decode_err; 2255 if (!sk_X509_push(certs, cert)) { 2256 SSLerror(s, ERR_R_MALLOC_FAILURE); 2257 goto err; 2258 } 2259 cert = NULL; 2260 } 2261 2262 if (ssl_verify_cert_chain(s, certs) <= 0) { 2263 al = ssl_verify_alarm_type(s->verify_result); 2264 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2265 goto fatal_err; 2266 } 2267 s->session->verify_result = s->verify_result; 2268 ERR_clear_error(); 2269 2270 if (!tls_process_peer_certs(s, certs)) 2271 goto err; 2272 2273 done: 2274 ret = 1; 2275 if (0) { 2276 decode_err: 2277 al = SSL_AD_DECODE_ERROR; 2278 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2279 fatal_err: 2280 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2281 } 2282 err: 2283 sk_X509_pop_free(certs, X509_free); 2284 X509_free(cert); 2285 2286 return (ret); 2287 } 2288 2289 static int 2290 ssl3_send_server_certificate(SSL *s) 2291 { 2292 CBB cbb, server_cert; 2293 SSL_CERT_PKEY *cpk; 2294 2295 /* 2296 * Server Certificate - RFC 5246, section 7.4.2. 2297 */ 2298 2299 memset(&cbb, 0, sizeof(cbb)); 2300 2301 if (s->s3->hs.state == SSL3_ST_SW_CERT_A) { 2302 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { 2303 SSLerror(s, ERR_R_INTERNAL_ERROR); 2304 return (0); 2305 } 2306 2307 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, 2308 SSL3_MT_CERTIFICATE)) 2309 goto err; 2310 if (!ssl3_output_cert_chain(s, &server_cert, cpk)) 2311 goto err; 2312 if (!ssl3_handshake_msg_finish(s, &cbb)) 2313 goto err; 2314 2315 s->s3->hs.state = SSL3_ST_SW_CERT_B; 2316 } 2317 2318 /* SSL3_ST_SW_CERT_B */ 2319 return (ssl3_handshake_write(s)); 2320 2321 err: 2322 CBB_cleanup(&cbb); 2323 2324 return (0); 2325 } 2326 2327 /* send a new session ticket (not necessarily for a new session) */ 2328 static int 2329 ssl3_send_newsession_ticket(SSL *s) 2330 { 2331 CBB cbb, session_ticket, ticket; 2332 SSL_CTX *tctx = s->initial_ctx; 2333 size_t enc_session_len, enc_session_max_len, hmac_len; 2334 size_t session_len = 0; 2335 unsigned char *enc_session = NULL, *session = NULL; 2336 unsigned char iv[EVP_MAX_IV_LENGTH]; 2337 unsigned char key_name[16]; 2338 unsigned char *hmac; 2339 unsigned int hlen; 2340 EVP_CIPHER_CTX *ctx = NULL; 2341 HMAC_CTX *hctx = NULL; 2342 int len; 2343 2344 /* 2345 * New Session Ticket - RFC 5077, section 3.3. 2346 */ 2347 2348 memset(&cbb, 0, sizeof(cbb)); 2349 2350 if ((ctx = EVP_CIPHER_CTX_new()) == NULL) 2351 goto err; 2352 if ((hctx = HMAC_CTX_new()) == NULL) 2353 goto err; 2354 2355 if (s->s3->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2356 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, 2357 SSL3_MT_NEWSESSION_TICKET)) 2358 goto err; 2359 2360 if (!SSL_SESSION_ticket(s->session, &session, &session_len)) 2361 goto err; 2362 if (session_len > 0xffff) 2363 goto err; 2364 2365 /* 2366 * Initialize HMAC and cipher contexts. If callback is present 2367 * it does all the work, otherwise use generated values from 2368 * parent context. 2369 */ 2370 if (tctx->tlsext_ticket_key_cb != NULL) { 2371 if (tctx->tlsext_ticket_key_cb(s, 2372 key_name, iv, ctx, hctx, 1) < 0) 2373 goto err; 2374 } else { 2375 arc4random_buf(iv, 16); 2376 EVP_EncryptInit_ex(ctx, EVP_aes_128_cbc(), NULL, 2377 tctx->tlsext_tick_aes_key, iv); 2378 HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key, 2379 16, EVP_sha256(), NULL); 2380 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 2381 } 2382 2383 /* Encrypt the session state. */ 2384 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; 2385 if ((enc_session = calloc(1, enc_session_max_len)) == NULL) 2386 goto err; 2387 enc_session_len = 0; 2388 if (!EVP_EncryptUpdate(ctx, enc_session, &len, session, 2389 session_len)) 2390 goto err; 2391 enc_session_len += len; 2392 if (!EVP_EncryptFinal_ex(ctx, enc_session + enc_session_len, 2393 &len)) 2394 goto err; 2395 enc_session_len += len; 2396 2397 if (enc_session_len > enc_session_max_len) 2398 goto err; 2399 2400 /* Generate the HMAC. */ 2401 if (!HMAC_Update(hctx, key_name, sizeof(key_name))) 2402 goto err; 2403 if (!HMAC_Update(hctx, iv, EVP_CIPHER_CTX_iv_length(ctx))) 2404 goto err; 2405 if (!HMAC_Update(hctx, enc_session, enc_session_len)) 2406 goto err; 2407 2408 if ((hmac_len = HMAC_size(hctx)) <= 0) 2409 goto err; 2410 2411 /* 2412 * Ticket lifetime hint (advisory only): 2413 * We leave this unspecified for resumed session 2414 * (for simplicity), and guess that tickets for new 2415 * sessions will live as long as their sessions. 2416 */ 2417 if (!CBB_add_u32(&session_ticket, 2418 s->hit ? 0 : s->session->timeout)) 2419 goto err; 2420 2421 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) 2422 goto err; 2423 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) 2424 goto err; 2425 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(ctx))) 2426 goto err; 2427 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) 2428 goto err; 2429 if (!CBB_add_space(&ticket, &hmac, hmac_len)) 2430 goto err; 2431 2432 if (!HMAC_Final(hctx, hmac, &hlen)) 2433 goto err; 2434 if (hlen != hmac_len) 2435 goto err; 2436 2437 if (!ssl3_handshake_msg_finish(s, &cbb)) 2438 goto err; 2439 2440 s->s3->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2441 } 2442 2443 EVP_CIPHER_CTX_free(ctx); 2444 HMAC_CTX_free(hctx); 2445 freezero(session, session_len); 2446 free(enc_session); 2447 2448 /* SSL3_ST_SW_SESSION_TICKET_B */ 2449 return (ssl3_handshake_write(s)); 2450 2451 err: 2452 CBB_cleanup(&cbb); 2453 EVP_CIPHER_CTX_free(ctx); 2454 HMAC_CTX_free(hctx); 2455 freezero(session, session_len); 2456 free(enc_session); 2457 2458 return (-1); 2459 } 2460 2461 static int 2462 ssl3_send_cert_status(SSL *s) 2463 { 2464 CBB cbb, certstatus, ocspresp; 2465 2466 memset(&cbb, 0, sizeof(cbb)); 2467 2468 if (s->s3->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2469 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, 2470 SSL3_MT_CERTIFICATE_STATUS)) 2471 goto err; 2472 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2473 goto err; 2474 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2475 goto err; 2476 if (!CBB_add_bytes(&ocspresp, s->tlsext_ocsp_resp, 2477 s->tlsext_ocsp_resp_len)) 2478 goto err; 2479 if (!ssl3_handshake_msg_finish(s, &cbb)) 2480 goto err; 2481 2482 s->s3->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2483 } 2484 2485 /* SSL3_ST_SW_CERT_STATUS_B */ 2486 return (ssl3_handshake_write(s)); 2487 2488 err: 2489 CBB_cleanup(&cbb); 2490 2491 return (-1); 2492 } 2493 2494 static int 2495 ssl3_send_server_change_cipher_spec(SSL *s) 2496 { 2497 size_t outlen; 2498 CBB cbb; 2499 2500 memset(&cbb, 0, sizeof(cbb)); 2501 2502 if (s->s3->hs.state == SSL3_ST_SW_CHANGE_A) { 2503 if (!CBB_init_fixed(&cbb, s->init_buf->data, 2504 s->init_buf->length)) 2505 goto err; 2506 if (!CBB_add_u8(&cbb, SSL3_MT_CCS)) 2507 goto err; 2508 if (!CBB_finish(&cbb, NULL, &outlen)) 2509 goto err; 2510 2511 if (outlen > INT_MAX) 2512 goto err; 2513 2514 s->init_num = (int)outlen; 2515 s->init_off = 0; 2516 2517 if (SSL_is_dtls(s)) { 2518 s->d1->handshake_write_seq = 2519 s->d1->next_handshake_write_seq; 2520 dtls1_set_message_header_int(s, SSL3_MT_CCS, 0, 2521 s->d1->handshake_write_seq, 0, 0); 2522 dtls1_buffer_message(s, 1); 2523 } 2524 2525 s->s3->hs.state = SSL3_ST_SW_CHANGE_B; 2526 } 2527 2528 /* SSL3_ST_SW_CHANGE_B */ 2529 return ssl3_record_write(s, SSL3_RT_CHANGE_CIPHER_SPEC); 2530 2531 err: 2532 CBB_cleanup(&cbb); 2533 2534 return -1; 2535 } 2536 2537 static int 2538 ssl3_get_client_finished(SSL *s) 2539 { 2540 int al, md_len, ret; 2541 CBS cbs; 2542 2543 /* should actually be 36+4 :-) */ 2544 if ((ret = ssl3_get_message(s, SSL3_ST_SR_FINISHED_A, 2545 SSL3_ST_SR_FINISHED_B, SSL3_MT_FINISHED, 64)) <= 0) 2546 return ret; 2547 2548 /* If this occurs, we have missed a message */ 2549 if (!s->s3->change_cipher_spec) { 2550 al = SSL_AD_UNEXPECTED_MESSAGE; 2551 SSLerror(s, SSL_R_GOT_A_FIN_BEFORE_A_CCS); 2552 goto fatal_err; 2553 } 2554 s->s3->change_cipher_spec = 0; 2555 2556 md_len = TLS1_FINISH_MAC_LENGTH; 2557 2558 if (s->init_num < 0) { 2559 al = SSL_AD_DECODE_ERROR; 2560 SSLerror(s, SSL_R_BAD_DIGEST_LENGTH); 2561 goto fatal_err; 2562 } 2563 2564 CBS_init(&cbs, s->init_msg, s->init_num); 2565 2566 if (s->s3->hs.peer_finished_len != md_len || 2567 CBS_len(&cbs) != md_len) { 2568 al = SSL_AD_DECODE_ERROR; 2569 SSLerror(s, SSL_R_BAD_DIGEST_LENGTH); 2570 goto fatal_err; 2571 } 2572 2573 if (!CBS_mem_equal(&cbs, s->s3->hs.peer_finished, CBS_len(&cbs))) { 2574 al = SSL_AD_DECRYPT_ERROR; 2575 SSLerror(s, SSL_R_DIGEST_CHECK_FAILED); 2576 goto fatal_err; 2577 } 2578 2579 /* Copy finished so we can use it for renegotiation checks. */ 2580 OPENSSL_assert(md_len <= EVP_MAX_MD_SIZE); 2581 memcpy(s->s3->previous_client_finished, 2582 s->s3->hs.peer_finished, md_len); 2583 s->s3->previous_client_finished_len = md_len; 2584 2585 return (1); 2586 fatal_err: 2587 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2588 return (0); 2589 } 2590 2591 static int 2592 ssl3_send_server_finished(SSL *s) 2593 { 2594 CBB cbb, finished; 2595 2596 memset(&cbb, 0, sizeof(cbb)); 2597 2598 if (s->s3->hs.state == SSL3_ST_SW_FINISHED_A) { 2599 if (!tls12_derive_finished(s)) 2600 goto err; 2601 2602 /* Copy finished so we can use it for renegotiation checks. */ 2603 memcpy(s->s3->previous_server_finished, 2604 s->s3->hs.finished, s->s3->hs.finished_len); 2605 s->s3->previous_server_finished_len = s->s3->hs.finished_len; 2606 2607 if (!ssl3_handshake_msg_start(s, &cbb, &finished, 2608 SSL3_MT_FINISHED)) 2609 goto err; 2610 if (!CBB_add_bytes(&finished, s->s3->hs.finished, 2611 s->s3->hs.finished_len)) 2612 goto err; 2613 if (!ssl3_handshake_msg_finish(s, &cbb)) 2614 goto err; 2615 2616 s->s3->hs.state = SSL3_ST_SW_FINISHED_B; 2617 } 2618 2619 return (ssl3_handshake_write(s)); 2620 2621 err: 2622 CBB_cleanup(&cbb); 2623 2624 return (-1); 2625 } 2626