1 /* $OpenBSD: ssl_srvr.c,v 1.111 2021/05/16 14:10:43 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <stdio.h> 152 153 #include <openssl/bn.h> 154 #include <openssl/buffer.h> 155 #include <openssl/curve25519.h> 156 #include <openssl/evp.h> 157 #include <openssl/dh.h> 158 #include <openssl/hmac.h> 159 #include <openssl/md5.h> 160 #include <openssl/objects.h> 161 #include <openssl/opensslconf.h> 162 #include <openssl/x509.h> 163 164 #ifndef OPENSSL_NO_GOST 165 #include <openssl/gost.h> 166 #endif 167 168 #include "bytestring.h" 169 #include "dtls_locl.h" 170 #include "ssl_locl.h" 171 #include "ssl_sigalgs.h" 172 #include "ssl_tlsext.h" 173 174 int 175 ssl3_accept(SSL *s) 176 { 177 void (*cb)(const SSL *ssl, int type, int val) = NULL; 178 unsigned long alg_k; 179 int ret = -1; 180 int new_state, state, skip = 0; 181 int listen = 0; 182 183 ERR_clear_error(); 184 errno = 0; 185 186 if (s->internal->info_callback != NULL) 187 cb = s->internal->info_callback; 188 else if (s->ctx->internal->info_callback != NULL) 189 cb = s->ctx->internal->info_callback; 190 191 if (SSL_is_dtls(s)) 192 listen = D1I(s)->listen; 193 194 /* init things to blank */ 195 s->internal->in_handshake++; 196 if (!SSL_in_init(s) || SSL_in_before(s)) 197 SSL_clear(s); 198 199 if (SSL_is_dtls(s)) 200 D1I(s)->listen = listen; 201 202 for (;;) { 203 state = S3I(s)->hs.state; 204 205 switch (S3I(s)->hs.state) { 206 case SSL_ST_RENEGOTIATE: 207 s->internal->renegotiate = 1; 208 /* S3I(s)->hs.state=SSL_ST_ACCEPT; */ 209 210 case SSL_ST_BEFORE: 211 case SSL_ST_ACCEPT: 212 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 213 case SSL_ST_OK|SSL_ST_ACCEPT: 214 s->server = 1; 215 if (cb != NULL) 216 cb(s, SSL_CB_HANDSHAKE_START, 1); 217 218 if (!ssl_legacy_stack_version(s, s->version)) { 219 SSLerror(s, ERR_R_INTERNAL_ERROR); 220 ret = -1; 221 goto end; 222 } 223 224 if (!ssl_supported_tls_version_range(s, 225 &S3I(s)->hs.our_min_tls_version, 226 &S3I(s)->hs.our_max_tls_version)) { 227 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 228 ret = -1; 229 goto end; 230 } 231 232 if (!ssl3_setup_init_buffer(s)) { 233 ret = -1; 234 goto end; 235 } 236 if (!ssl3_setup_buffers(s)) { 237 ret = -1; 238 goto end; 239 } 240 241 s->internal->init_num = 0; 242 243 if (S3I(s)->hs.state != SSL_ST_RENEGOTIATE) { 244 /* 245 * Ok, we now need to push on a buffering BIO 246 * so that the output is sent in a way that 247 * TCP likes :-) 248 */ 249 if (!ssl_init_wbio_buffer(s, 1)) { 250 ret = -1; 251 goto end; 252 } 253 254 if (!tls1_transcript_init(s)) { 255 ret = -1; 256 goto end; 257 } 258 259 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_A; 260 s->ctx->internal->stats.sess_accept++; 261 } else if (!SSL_is_dtls(s) && !S3I(s)->send_connection_binding) { 262 /* 263 * Server attempting to renegotiate with 264 * client that doesn't support secure 265 * renegotiation. 266 */ 267 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 268 ssl3_send_alert(s, SSL3_AL_FATAL, 269 SSL_AD_HANDSHAKE_FAILURE); 270 ret = -1; 271 goto end; 272 } else { 273 /* 274 * S3I(s)->hs.state == SSL_ST_RENEGOTIATE, 275 * we will just send a HelloRequest. 276 */ 277 s->ctx->internal->stats.sess_accept_renegotiate++; 278 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_A; 279 } 280 break; 281 282 case SSL3_ST_SW_HELLO_REQ_A: 283 case SSL3_ST_SW_HELLO_REQ_B: 284 s->internal->shutdown = 0; 285 if (SSL_is_dtls(s)) { 286 dtls1_clear_record_buffer(s); 287 dtls1_start_timer(s); 288 } 289 ret = ssl3_send_hello_request(s); 290 if (ret <= 0) 291 goto end; 292 if (SSL_is_dtls(s)) 293 S3I(s)->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A; 294 else 295 S3I(s)->hs.tls12.next_state = SSL3_ST_SW_HELLO_REQ_C; 296 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 297 s->internal->init_num = 0; 298 299 if (SSL_is_dtls(s)) { 300 if (!tls1_transcript_init(s)) { 301 ret = -1; 302 goto end; 303 } 304 } 305 break; 306 307 case SSL3_ST_SW_HELLO_REQ_C: 308 S3I(s)->hs.state = SSL_ST_OK; 309 break; 310 311 case SSL3_ST_SR_CLNT_HELLO_A: 312 case SSL3_ST_SR_CLNT_HELLO_B: 313 case SSL3_ST_SR_CLNT_HELLO_C: 314 s->internal->shutdown = 0; 315 if (SSL_is_dtls(s)) { 316 ret = ssl3_get_client_hello(s); 317 if (ret <= 0) 318 goto end; 319 dtls1_stop_timer(s); 320 321 if (ret == 1 && 322 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 323 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 324 else 325 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 326 327 s->internal->init_num = 0; 328 329 /* 330 * Reflect ClientHello sequence to remain 331 * stateless while listening. 332 */ 333 if (listen) { 334 tls12_record_layer_reflect_seq_num( 335 s->internal->rl); 336 } 337 338 /* If we're just listening, stop here */ 339 if (listen && S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 340 ret = 2; 341 D1I(s)->listen = 0; 342 /* 343 * Set expected sequence numbers to 344 * continue the handshake. 345 */ 346 D1I(s)->handshake_read_seq = 2; 347 D1I(s)->handshake_write_seq = 1; 348 D1I(s)->next_handshake_write_seq = 1; 349 goto end; 350 } 351 } else { 352 if (s->internal->rwstate != SSL_X509_LOOKUP) { 353 ret = ssl3_get_client_hello(s); 354 if (ret <= 0) 355 goto end; 356 } 357 358 s->internal->renegotiate = 2; 359 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 360 s->internal->init_num = 0; 361 } 362 break; 363 364 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 365 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 366 ret = ssl3_send_dtls_hello_verify_request(s); 367 if (ret <= 0) 368 goto end; 369 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 370 S3I(s)->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A; 371 372 /* HelloVerifyRequest resets Finished MAC. */ 373 tls1_transcript_reset(s); 374 break; 375 376 case SSL3_ST_SW_SRVR_HELLO_A: 377 case SSL3_ST_SW_SRVR_HELLO_B: 378 if (SSL_is_dtls(s)) { 379 s->internal->renegotiate = 2; 380 dtls1_start_timer(s); 381 } 382 ret = ssl3_send_server_hello(s); 383 if (ret <= 0) 384 goto end; 385 if (s->internal->hit) { 386 if (s->internal->tlsext_ticket_expected) 387 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 388 else 389 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 390 } else { 391 S3I(s)->hs.state = SSL3_ST_SW_CERT_A; 392 } 393 s->internal->init_num = 0; 394 break; 395 396 case SSL3_ST_SW_CERT_A: 397 case SSL3_ST_SW_CERT_B: 398 /* Check if it is anon DH or anon ECDH. */ 399 if (!(S3I(s)->hs.cipher->algorithm_auth & 400 SSL_aNULL)) { 401 if (SSL_is_dtls(s)) 402 dtls1_start_timer(s); 403 ret = ssl3_send_server_certificate(s); 404 if (ret <= 0) 405 goto end; 406 if (s->internal->tlsext_status_expected) 407 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_A; 408 else 409 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 410 } else { 411 skip = 1; 412 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 413 } 414 s->internal->init_num = 0; 415 break; 416 417 case SSL3_ST_SW_KEY_EXCH_A: 418 case SSL3_ST_SW_KEY_EXCH_B: 419 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 420 421 /* 422 * Only send if using a DH key exchange. 423 * 424 * For ECC ciphersuites, we send a ServerKeyExchange 425 * message only if the cipher suite is ECDHE. In other 426 * cases, the server certificate contains the server's 427 * public key for key exchange. 428 */ 429 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 430 if (SSL_is_dtls(s)) 431 dtls1_start_timer(s); 432 ret = ssl3_send_server_key_exchange(s); 433 if (ret <= 0) 434 goto end; 435 } else 436 skip = 1; 437 438 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_A; 439 s->internal->init_num = 0; 440 break; 441 442 case SSL3_ST_SW_CERT_REQ_A: 443 case SSL3_ST_SW_CERT_REQ_B: 444 /* 445 * Determine whether or not we need to request a 446 * certificate. 447 * 448 * Do not request a certificate if: 449 * 450 * - We did not ask for it (SSL_VERIFY_PEER is unset). 451 * 452 * - SSL_VERIFY_CLIENT_ONCE is set and we are 453 * renegotiating. 454 * 455 * - We are using an anonymous ciphersuites 456 * (see section "Certificate request" in SSL 3 drafts 457 * and in RFC 2246) ... except when the application 458 * insists on verification (against the specs, but 459 * s3_clnt.c accepts this for SSL 3). 460 */ 461 if (!(s->verify_mode & SSL_VERIFY_PEER) || 462 ((s->session->peer != NULL) && 463 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 464 ((S3I(s)->hs.cipher->algorithm_auth & 465 SSL_aNULL) && !(s->verify_mode & 466 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) { 467 /* No cert request. */ 468 skip = 1; 469 S3I(s)->hs.tls12.cert_request = 0; 470 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; 471 472 if (!SSL_is_dtls(s)) 473 tls1_transcript_free(s); 474 } else { 475 S3I(s)->hs.tls12.cert_request = 1; 476 if (SSL_is_dtls(s)) 477 dtls1_start_timer(s); 478 ret = ssl3_send_certificate_request(s); 479 if (ret <= 0) 480 goto end; 481 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; 482 s->internal->init_num = 0; 483 } 484 break; 485 486 case SSL3_ST_SW_SRVR_DONE_A: 487 case SSL3_ST_SW_SRVR_DONE_B: 488 if (SSL_is_dtls(s)) 489 dtls1_start_timer(s); 490 ret = ssl3_send_server_done(s); 491 if (ret <= 0) 492 goto end; 493 S3I(s)->hs.tls12.next_state = SSL3_ST_SR_CERT_A; 494 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 495 s->internal->init_num = 0; 496 break; 497 498 case SSL3_ST_SW_FLUSH: 499 /* 500 * This code originally checked to see if 501 * any data was pending using BIO_CTRL_INFO 502 * and then flushed. This caused problems 503 * as documented in PR#1939. The proposed 504 * fix doesn't completely resolve this issue 505 * as buggy implementations of BIO_CTRL_PENDING 506 * still exist. So instead we just flush 507 * unconditionally. 508 */ 509 s->internal->rwstate = SSL_WRITING; 510 if (BIO_flush(s->wbio) <= 0) { 511 if (SSL_is_dtls(s)) { 512 /* If the write error was fatal, stop trying. */ 513 if (!BIO_should_retry(s->wbio)) { 514 s->internal->rwstate = SSL_NOTHING; 515 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 516 } 517 } 518 ret = -1; 519 goto end; 520 } 521 s->internal->rwstate = SSL_NOTHING; 522 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 523 break; 524 525 case SSL3_ST_SR_CERT_A: 526 case SSL3_ST_SR_CERT_B: 527 if (S3I(s)->hs.tls12.cert_request) { 528 ret = ssl3_get_client_certificate(s); 529 if (ret <= 0) 530 goto end; 531 } 532 s->internal->init_num = 0; 533 S3I(s)->hs.state = SSL3_ST_SR_KEY_EXCH_A; 534 break; 535 536 case SSL3_ST_SR_KEY_EXCH_A: 537 case SSL3_ST_SR_KEY_EXCH_B: 538 ret = ssl3_get_client_key_exchange(s); 539 if (ret <= 0) 540 goto end; 541 542 if (SSL_is_dtls(s)) { 543 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 544 s->internal->init_num = 0; 545 } 546 547 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 548 if (ret == 2) { 549 /* 550 * For the ECDH ciphersuites when 551 * the client sends its ECDH pub key in 552 * a certificate, the CertificateVerify 553 * message is not sent. 554 * Also for GOST ciphersuites when 555 * the client uses its key from the certificate 556 * for key exchange. 557 */ 558 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; 559 s->internal->init_num = 0; 560 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) { 561 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 562 s->internal->init_num = 0; 563 if (!s->session->peer) 564 break; 565 /* 566 * Freeze the transcript for use during client 567 * certificate verification. 568 */ 569 tls1_transcript_freeze(s); 570 } else { 571 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 572 s->internal->init_num = 0; 573 574 tls1_transcript_free(s); 575 576 /* 577 * We need to get hashes here so if there is 578 * a client cert, it can be verified. 579 */ 580 if (!tls1_transcript_hash_value(s, 581 S3I(s)->hs.tls12.cert_verify, 582 sizeof(S3I(s)->hs.tls12.cert_verify), 583 NULL)) { 584 ret = -1; 585 goto end; 586 } 587 } 588 break; 589 590 case SSL3_ST_SR_CERT_VRFY_A: 591 case SSL3_ST_SR_CERT_VRFY_B: 592 if (SSL_is_dtls(s)) 593 D1I(s)->change_cipher_spec_ok = 1; 594 else 595 s->s3->flags |= SSL3_FLAGS_CCS_OK; 596 597 /* we should decide if we expected this one */ 598 ret = ssl3_get_cert_verify(s); 599 if (ret <= 0) 600 goto end; 601 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; 602 s->internal->init_num = 0; 603 break; 604 605 case SSL3_ST_SR_FINISHED_A: 606 case SSL3_ST_SR_FINISHED_B: 607 if (SSL_is_dtls(s)) 608 D1I(s)->change_cipher_spec_ok = 1; 609 else 610 s->s3->flags |= SSL3_FLAGS_CCS_OK; 611 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 612 SSL3_ST_SR_FINISHED_B); 613 if (ret <= 0) 614 goto end; 615 if (SSL_is_dtls(s)) 616 dtls1_stop_timer(s); 617 if (s->internal->hit) 618 S3I(s)->hs.state = SSL_ST_OK; 619 else if (s->internal->tlsext_ticket_expected) 620 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 621 else 622 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 623 s->internal->init_num = 0; 624 break; 625 626 case SSL3_ST_SW_SESSION_TICKET_A: 627 case SSL3_ST_SW_SESSION_TICKET_B: 628 ret = ssl3_send_newsession_ticket(s); 629 if (ret <= 0) 630 goto end; 631 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 632 s->internal->init_num = 0; 633 break; 634 635 case SSL3_ST_SW_CERT_STATUS_A: 636 case SSL3_ST_SW_CERT_STATUS_B: 637 ret = ssl3_send_cert_status(s); 638 if (ret <= 0) 639 goto end; 640 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 641 s->internal->init_num = 0; 642 break; 643 644 case SSL3_ST_SW_CHANGE_A: 645 case SSL3_ST_SW_CHANGE_B: 646 ret = ssl3_send_change_cipher_spec(s, 647 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B); 648 if (ret <= 0) 649 goto end; 650 S3I(s)->hs.state = SSL3_ST_SW_FINISHED_A; 651 s->internal->init_num = 0; 652 s->session->cipher = S3I(s)->hs.cipher; 653 654 if (!tls1_setup_key_block(s)) { 655 ret = -1; 656 goto end; 657 } 658 if (!tls1_change_write_cipher_state(s)) { 659 ret = -1; 660 goto end; 661 } 662 break; 663 664 case SSL3_ST_SW_FINISHED_A: 665 case SSL3_ST_SW_FINISHED_B: 666 ret = ssl3_send_finished(s, SSL3_ST_SW_FINISHED_A, 667 SSL3_ST_SW_FINISHED_B); 668 if (ret <= 0) 669 goto end; 670 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 671 if (s->internal->hit) { 672 S3I(s)->hs.tls12.next_state = SSL3_ST_SR_FINISHED_A; 673 tls1_transcript_free(s); 674 } else 675 S3I(s)->hs.tls12.next_state = SSL_ST_OK; 676 s->internal->init_num = 0; 677 break; 678 679 case SSL_ST_OK: 680 /* clean a few things up */ 681 tls1_cleanup_key_block(s); 682 683 if (S3I(s)->handshake_transcript != NULL) { 684 SSLerror(s, ERR_R_INTERNAL_ERROR); 685 ret = -1; 686 goto end; 687 } 688 689 if (!SSL_is_dtls(s)) 690 ssl3_release_init_buffer(s); 691 692 /* remove buffering on output */ 693 ssl_free_wbio_buffer(s); 694 695 s->internal->init_num = 0; 696 697 /* Skipped if we just sent a HelloRequest. */ 698 if (s->internal->renegotiate == 2) { 699 s->internal->renegotiate = 0; 700 s->internal->new_session = 0; 701 702 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 703 704 s->ctx->internal->stats.sess_accept_good++; 705 /* s->server=1; */ 706 s->internal->handshake_func = ssl3_accept; 707 708 if (cb != NULL) 709 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 710 } 711 712 ret = 1; 713 714 if (SSL_is_dtls(s)) { 715 /* Done handshaking, next message is client hello. */ 716 D1I(s)->handshake_read_seq = 0; 717 /* Next message is server hello. */ 718 D1I(s)->handshake_write_seq = 0; 719 D1I(s)->next_handshake_write_seq = 0; 720 } 721 goto end; 722 /* break; */ 723 724 default: 725 SSLerror(s, SSL_R_UNKNOWN_STATE); 726 ret = -1; 727 goto end; 728 /* break; */ 729 } 730 731 if (!S3I(s)->hs.tls12.reuse_message && !skip) { 732 if (s->internal->debug) { 733 if ((ret = BIO_flush(s->wbio)) <= 0) 734 goto end; 735 } 736 737 738 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 739 new_state = S3I(s)->hs.state; 740 S3I(s)->hs.state = state; 741 cb(s, SSL_CB_ACCEPT_LOOP, 1); 742 S3I(s)->hs.state = new_state; 743 } 744 } 745 skip = 0; 746 } 747 end: 748 /* BIO_flush(s->wbio); */ 749 s->internal->in_handshake--; 750 if (cb != NULL) 751 cb(s, SSL_CB_ACCEPT_EXIT, ret); 752 753 return (ret); 754 } 755 756 int 757 ssl3_send_hello_request(SSL *s) 758 { 759 CBB cbb, hello; 760 761 memset(&cbb, 0, sizeof(cbb)); 762 763 if (S3I(s)->hs.state == SSL3_ST_SW_HELLO_REQ_A) { 764 if (!ssl3_handshake_msg_start(s, &cbb, &hello, 765 SSL3_MT_HELLO_REQUEST)) 766 goto err; 767 if (!ssl3_handshake_msg_finish(s, &cbb)) 768 goto err; 769 770 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_B; 771 } 772 773 /* SSL3_ST_SW_HELLO_REQ_B */ 774 return (ssl3_handshake_write(s)); 775 776 err: 777 CBB_cleanup(&cbb); 778 779 return (-1); 780 } 781 782 int 783 ssl3_get_client_hello(SSL *s) 784 { 785 CBS cbs, client_random, session_id, cookie, cipher_suites; 786 CBS compression_methods; 787 uint16_t client_version; 788 uint8_t comp_method; 789 int comp_null; 790 int i, j, ok, al, ret = -1, cookie_valid = 0; 791 long n; 792 unsigned long id; 793 SSL_CIPHER *c; 794 STACK_OF(SSL_CIPHER) *ciphers = NULL; 795 unsigned long alg_k; 796 const SSL_METHOD *method; 797 uint16_t shared_version; 798 799 /* 800 * We do this so that we will respond with our native type. 801 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, 802 * This down switching should be handled by a different method. 803 * If we are SSLv3, we will respond with SSLv3, even if prompted with 804 * TLSv1. 805 */ 806 if (S3I(s)->hs.state == SSL3_ST_SR_CLNT_HELLO_A) { 807 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_B; 808 } 809 810 s->internal->first_packet = 1; 811 n = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, 812 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, 813 SSL3_RT_MAX_PLAIN_LENGTH, &ok); 814 if (!ok) 815 return ((int)n); 816 s->internal->first_packet = 0; 817 818 if (n < 0) 819 goto err; 820 821 CBS_init(&cbs, s->internal->init_msg, n); 822 823 /* Parse client hello up until the extensions (if any). */ 824 if (!CBS_get_u16(&cbs, &client_version)) 825 goto decode_err; 826 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE)) 827 goto decode_err; 828 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 829 goto decode_err; 830 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 831 al = SSL_AD_ILLEGAL_PARAMETER; 832 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 833 goto fatal_err; 834 } 835 if (SSL_is_dtls(s)) { 836 if (!CBS_get_u8_length_prefixed(&cbs, &cookie)) 837 goto decode_err; 838 } 839 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites)) 840 goto decode_err; 841 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods)) 842 goto decode_err; 843 844 /* 845 * Use version from inside client hello, not from record header. 846 * (may differ: see RFC 2246, Appendix E, second paragraph) 847 */ 848 if (!ssl_max_shared_version(s, client_version, &shared_version)) { 849 if ((s->client_version >> 8) == SSL3_VERSION_MAJOR && 850 !tls12_record_layer_write_protected(s->internal->rl)) { 851 /* 852 * Similar to ssl3_get_record, send alert using remote 853 * version number. 854 */ 855 s->version = s->client_version; 856 } 857 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER); 858 al = SSL_AD_PROTOCOL_VERSION; 859 goto fatal_err; 860 } 861 s->client_version = client_version; 862 s->version = shared_version; 863 864 S3I(s)->hs.negotiated_tls_version = ssl_tls_version(shared_version); 865 if (S3I(s)->hs.negotiated_tls_version == 0) { 866 SSLerror(s, ERR_R_INTERNAL_ERROR); 867 goto err; 868 } 869 870 if ((method = ssl_get_method(shared_version)) == NULL) { 871 SSLerror(s, ERR_R_INTERNAL_ERROR); 872 goto err; 873 } 874 s->method = method; 875 876 /* 877 * If we require cookies (DTLS) and this ClientHello does not contain 878 * one, just return since we do not want to allocate any memory yet. 879 * So check cookie length... 880 */ 881 if (SSL_is_dtls(s)) { 882 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 883 if (CBS_len(&cookie) == 0) 884 return (1); 885 } 886 } 887 888 if (!CBS_write_bytes(&client_random, s->s3->client_random, 889 sizeof(s->s3->client_random), NULL)) 890 goto err; 891 892 s->internal->hit = 0; 893 894 /* 895 * Versions before 0.9.7 always allow clients to resume sessions in 896 * renegotiation. 0.9.7 and later allow this by default, but optionally 897 * ignore resumption requests with flag 898 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag 899 * rather than a change to default behavior so that applications 900 * relying on this for security won't even compile against older 901 * library versions). 902 * 903 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() 904 * to request renegotiation but not a new session (s->internal->new_session 905 * remains unset): for servers, this essentially just means that the 906 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be 907 * ignored. 908 */ 909 if ((s->internal->new_session && (s->internal->options & 910 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { 911 if (!ssl_get_new_session(s, 1)) 912 goto err; 913 } else { 914 CBS ext_block; 915 916 CBS_dup(&cbs, &ext_block); 917 918 i = ssl_get_prev_session(s, &session_id, &ext_block, &al); 919 if (i == 1) { /* previous session */ 920 s->internal->hit = 1; 921 } else if (i == -1) 922 goto fatal_err; 923 else { 924 /* i == 0 */ 925 if (!ssl_get_new_session(s, 1)) 926 goto err; 927 } 928 } 929 930 if (SSL_is_dtls(s)) { 931 /* 932 * The ClientHello may contain a cookie even if the HelloVerify 933 * message has not been sent - make sure that it does not cause 934 * an overflow. 935 */ 936 if (CBS_len(&cookie) > sizeof(D1I(s)->rcvd_cookie)) { 937 al = SSL_AD_DECODE_ERROR; 938 SSLerror(s, SSL_R_COOKIE_MISMATCH); 939 goto fatal_err; 940 } 941 942 /* Verify the cookie if appropriate option is set. */ 943 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && 944 CBS_len(&cookie) > 0) { 945 size_t cookie_len; 946 947 /* XXX - rcvd_cookie seems to only be used here... */ 948 if (!CBS_write_bytes(&cookie, D1I(s)->rcvd_cookie, 949 sizeof(D1I(s)->rcvd_cookie), &cookie_len)) 950 goto err; 951 952 if (s->ctx->internal->app_verify_cookie_cb != NULL) { 953 if (s->ctx->internal->app_verify_cookie_cb(s, 954 D1I(s)->rcvd_cookie, cookie_len) == 0) { 955 al = SSL_AD_HANDSHAKE_FAILURE; 956 SSLerror(s, SSL_R_COOKIE_MISMATCH); 957 goto fatal_err; 958 } 959 /* else cookie verification succeeded */ 960 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */ 961 } else if (timingsafe_memcmp(D1I(s)->rcvd_cookie, 962 D1I(s)->cookie, D1I(s)->cookie_len) != 0) { 963 /* default verification */ 964 al = SSL_AD_HANDSHAKE_FAILURE; 965 SSLerror(s, SSL_R_COOKIE_MISMATCH); 966 goto fatal_err; 967 } 968 cookie_valid = 1; 969 } 970 } 971 972 /* XXX - This logic seems wrong... */ 973 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) { 974 /* we need a cipher if we are not resuming a session */ 975 al = SSL_AD_ILLEGAL_PARAMETER; 976 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED); 977 goto fatal_err; 978 } 979 980 if (CBS_len(&cipher_suites) > 0) { 981 if ((ciphers = ssl_bytes_to_cipher_list(s, 982 &cipher_suites)) == NULL) 983 goto err; 984 } 985 986 /* If it is a hit, check that the cipher is in the list */ 987 /* XXX - CBS_len(&cipher_suites) will always be zero here... */ 988 if (s->internal->hit && CBS_len(&cipher_suites) > 0) { 989 j = 0; 990 id = s->session->cipher->id; 991 992 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 993 c = sk_SSL_CIPHER_value(ciphers, i); 994 if (c->id == id) { 995 j = 1; 996 break; 997 } 998 } 999 if (j == 0) { 1000 /* 1001 * We need to have the cipher in the cipher 1002 * list if we are asked to reuse it 1003 */ 1004 al = SSL_AD_ILLEGAL_PARAMETER; 1005 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING); 1006 goto fatal_err; 1007 } 1008 } 1009 1010 comp_null = 0; 1011 while (CBS_len(&compression_methods) > 0) { 1012 if (!CBS_get_u8(&compression_methods, &comp_method)) 1013 goto decode_err; 1014 if (comp_method == 0) 1015 comp_null = 1; 1016 } 1017 if (comp_null == 0) { 1018 al = SSL_AD_DECODE_ERROR; 1019 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED); 1020 goto fatal_err; 1021 } 1022 1023 if (!tlsext_server_parse(s, SSL_TLSEXT_MSG_CH, &cbs, &al)) { 1024 SSLerror(s, SSL_R_PARSE_TLSEXT); 1025 goto fatal_err; 1026 } 1027 1028 if (!S3I(s)->renegotiate_seen && s->internal->renegotiate) { 1029 al = SSL_AD_HANDSHAKE_FAILURE; 1030 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1031 goto fatal_err; 1032 } 1033 1034 if (ssl_check_clienthello_tlsext_early(s) <= 0) { 1035 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1036 goto err; 1037 } 1038 1039 /* 1040 * Check if we want to use external pre-shared secret for this 1041 * handshake for not reused session only. We need to generate 1042 * server_random before calling tls_session_secret_cb in order to allow 1043 * SessionTicket processing to use it in key derivation. 1044 */ 1045 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE); 1046 1047 if (S3I(s)->hs.our_max_tls_version >= TLS1_2_VERSION && 1048 S3I(s)->hs.negotiated_tls_version < S3I(s)->hs.our_max_tls_version) { 1049 /* 1050 * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3 1051 * we must set the last 8 bytes of the server random to magical 1052 * values to indicate we meant to downgrade. For TLS 1.2 it is 1053 * recommended that we do the same. 1054 */ 1055 size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12); 1056 uint8_t *magic = &s->s3->server_random[index]; 1057 if (S3I(s)->hs.negotiated_tls_version == TLS1_2_VERSION) { 1058 /* Indicate we chose to downgrade to 1.2. */ 1059 memcpy(magic, tls13_downgrade_12, 1060 sizeof(tls13_downgrade_12)); 1061 } else { 1062 /* Indicate we chose to downgrade to 1.1 or lower */ 1063 memcpy(magic, tls13_downgrade_11, 1064 sizeof(tls13_downgrade_11)); 1065 } 1066 } 1067 1068 if (!s->internal->hit && s->internal->tls_session_secret_cb) { 1069 SSL_CIPHER *pref_cipher = NULL; 1070 1071 s->session->master_key_length = sizeof(s->session->master_key); 1072 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 1073 &s->session->master_key_length, ciphers, &pref_cipher, 1074 s->internal->tls_session_secret_cb_arg)) { 1075 s->internal->hit = 1; 1076 s->session->ciphers = ciphers; 1077 s->session->verify_result = X509_V_OK; 1078 1079 ciphers = NULL; 1080 1081 /* check if some cipher was preferred by call back */ 1082 pref_cipher = pref_cipher ? pref_cipher : 1083 ssl3_choose_cipher(s, s->session->ciphers, 1084 SSL_get_ciphers(s)); 1085 if (pref_cipher == NULL) { 1086 al = SSL_AD_HANDSHAKE_FAILURE; 1087 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1088 goto fatal_err; 1089 } 1090 1091 s->session->cipher = pref_cipher; 1092 1093 sk_SSL_CIPHER_free(s->cipher_list); 1094 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); 1095 } 1096 } 1097 1098 /* 1099 * Given s->session->ciphers and SSL_get_ciphers, we must 1100 * pick a cipher 1101 */ 1102 1103 if (!s->internal->hit) { 1104 sk_SSL_CIPHER_free(s->session->ciphers); 1105 s->session->ciphers = ciphers; 1106 if (ciphers == NULL) { 1107 al = SSL_AD_ILLEGAL_PARAMETER; 1108 SSLerror(s, SSL_R_NO_CIPHERS_PASSED); 1109 goto fatal_err; 1110 } 1111 ciphers = NULL; 1112 c = ssl3_choose_cipher(s, s->session->ciphers, 1113 SSL_get_ciphers(s)); 1114 1115 if (c == NULL) { 1116 al = SSL_AD_HANDSHAKE_FAILURE; 1117 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1118 goto fatal_err; 1119 } 1120 S3I(s)->hs.cipher = c; 1121 } else { 1122 S3I(s)->hs.cipher = s->session->cipher; 1123 } 1124 1125 if (!tls1_transcript_hash_init(s)) 1126 goto err; 1127 1128 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1129 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) || 1130 !(s->verify_mode & SSL_VERIFY_PEER)) 1131 tls1_transcript_free(s); 1132 1133 /* 1134 * We now have the following setup. 1135 * client_random 1136 * cipher_list - our prefered list of ciphers 1137 * ciphers - the clients prefered list of ciphers 1138 * compression - basically ignored right now 1139 * ssl version is set - sslv3 1140 * s->session - The ssl session has been setup. 1141 * s->internal->hit - session reuse flag 1142 * s->hs.cipher - the new cipher to use. 1143 */ 1144 1145 /* Handles TLS extensions that we couldn't check earlier */ 1146 if (ssl_check_clienthello_tlsext_late(s) <= 0) { 1147 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1148 goto err; 1149 } 1150 1151 ret = cookie_valid ? 2 : 1; 1152 1153 if (0) { 1154 decode_err: 1155 al = SSL_AD_DECODE_ERROR; 1156 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1157 fatal_err: 1158 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1159 } 1160 err: 1161 sk_SSL_CIPHER_free(ciphers); 1162 1163 return (ret); 1164 } 1165 1166 int 1167 ssl3_send_dtls_hello_verify_request(SSL *s) 1168 { 1169 CBB cbb, verify, cookie; 1170 1171 memset(&cbb, 0, sizeof(cbb)); 1172 1173 if (S3I(s)->hs.state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 1174 if (s->ctx->internal->app_gen_cookie_cb == NULL || 1175 s->ctx->internal->app_gen_cookie_cb(s, D1I(s)->cookie, 1176 &(D1I(s)->cookie_len)) == 0) { 1177 SSLerror(s, ERR_R_INTERNAL_ERROR); 1178 return 0; 1179 } 1180 1181 /* 1182 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should 1183 * always contain DTLSv1.0 regardless of the version that is 1184 * going to be negotiated. 1185 */ 1186 if (!ssl3_handshake_msg_start(s, &cbb, &verify, 1187 DTLS1_MT_HELLO_VERIFY_REQUEST)) 1188 goto err; 1189 if (!CBB_add_u16(&verify, DTLS1_VERSION)) 1190 goto err; 1191 if (!CBB_add_u8_length_prefixed(&verify, &cookie)) 1192 goto err; 1193 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, D1I(s)->cookie_len)) 1194 goto err; 1195 if (!ssl3_handshake_msg_finish(s, &cbb)) 1196 goto err; 1197 1198 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 1199 } 1200 1201 /* S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 1202 return (ssl3_handshake_write(s)); 1203 1204 err: 1205 CBB_cleanup(&cbb); 1206 1207 return (-1); 1208 } 1209 1210 int 1211 ssl3_send_server_hello(SSL *s) 1212 { 1213 CBB cbb, server_hello, session_id; 1214 size_t sl; 1215 1216 memset(&cbb, 0, sizeof(cbb)); 1217 1218 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 1219 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello, 1220 SSL3_MT_SERVER_HELLO)) 1221 goto err; 1222 1223 if (!CBB_add_u16(&server_hello, s->version)) 1224 goto err; 1225 if (!CBB_add_bytes(&server_hello, s->s3->server_random, 1226 sizeof(s->s3->server_random))) 1227 goto err; 1228 1229 /* 1230 * There are several cases for the session ID to send 1231 * back in the server hello: 1232 * 1233 * - For session reuse from the session cache, 1234 * we send back the old session ID. 1235 * - If stateless session reuse (using a session ticket) 1236 * is successful, we send back the client's "session ID" 1237 * (which doesn't actually identify the session). 1238 * - If it is a new session, we send back the new 1239 * session ID. 1240 * - However, if we want the new session to be single-use, 1241 * we send back a 0-length session ID. 1242 * 1243 * s->internal->hit is non-zero in either case of session reuse, 1244 * so the following won't overwrite an ID that we're supposed 1245 * to send back. 1246 */ 1247 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER) 1248 && !s->internal->hit) 1249 s->session->session_id_length = 0; 1250 1251 sl = s->session->session_id_length; 1252 if (sl > sizeof(s->session->session_id)) { 1253 SSLerror(s, ERR_R_INTERNAL_ERROR); 1254 goto err; 1255 } 1256 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) 1257 goto err; 1258 if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) 1259 goto err; 1260 1261 /* Cipher suite. */ 1262 if (!CBB_add_u16(&server_hello, 1263 ssl3_cipher_get_value(S3I(s)->hs.cipher))) 1264 goto err; 1265 1266 /* Compression method (null). */ 1267 if (!CBB_add_u8(&server_hello, 0)) 1268 goto err; 1269 1270 /* TLS extensions */ 1271 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) { 1272 SSLerror(s, ERR_R_INTERNAL_ERROR); 1273 goto err; 1274 } 1275 1276 if (!ssl3_handshake_msg_finish(s, &cbb)) 1277 goto err; 1278 } 1279 1280 /* SSL3_ST_SW_SRVR_HELLO_B */ 1281 return (ssl3_handshake_write(s)); 1282 1283 err: 1284 CBB_cleanup(&cbb); 1285 1286 return (-1); 1287 } 1288 1289 int 1290 ssl3_send_server_done(SSL *s) 1291 { 1292 CBB cbb, done; 1293 1294 memset(&cbb, 0, sizeof(cbb)); 1295 1296 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) { 1297 if (!ssl3_handshake_msg_start(s, &cbb, &done, 1298 SSL3_MT_SERVER_DONE)) 1299 goto err; 1300 if (!ssl3_handshake_msg_finish(s, &cbb)) 1301 goto err; 1302 1303 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B; 1304 } 1305 1306 /* SSL3_ST_SW_SRVR_DONE_B */ 1307 return (ssl3_handshake_write(s)); 1308 1309 err: 1310 CBB_cleanup(&cbb); 1311 1312 return (-1); 1313 } 1314 1315 static int 1316 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) 1317 { 1318 CBB dh_p, dh_g, dh_Ys; 1319 DH *dh = NULL, *dhp; 1320 unsigned char *data; 1321 int al; 1322 1323 if (s->cert->dh_tmp_auto != 0) { 1324 if ((dhp = ssl_get_auto_dh(s)) == NULL) { 1325 al = SSL_AD_INTERNAL_ERROR; 1326 SSLerror(s, ERR_R_INTERNAL_ERROR); 1327 goto fatal_err; 1328 } 1329 } else 1330 dhp = s->cert->dh_tmp; 1331 1332 if (dhp == NULL && s->cert->dh_tmp_cb != NULL) 1333 dhp = s->cert->dh_tmp_cb(s, 0, 1334 SSL_C_PKEYLENGTH(S3I(s)->hs.cipher)); 1335 1336 if (dhp == NULL) { 1337 al = SSL_AD_HANDSHAKE_FAILURE; 1338 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1339 goto fatal_err; 1340 } 1341 1342 if (S3I(s)->tmp.dh != NULL) { 1343 SSLerror(s, ERR_R_INTERNAL_ERROR); 1344 goto err; 1345 } 1346 1347 if (s->cert->dh_tmp_auto != 0) { 1348 dh = dhp; 1349 } else if ((dh = DHparams_dup(dhp)) == NULL) { 1350 SSLerror(s, ERR_R_DH_LIB); 1351 goto err; 1352 } 1353 S3I(s)->tmp.dh = dh; 1354 if (!DH_generate_key(dh)) { 1355 SSLerror(s, ERR_R_DH_LIB); 1356 goto err; 1357 } 1358 1359 /* 1360 * Serialize the DH parameters and public key. 1361 */ 1362 if (!CBB_add_u16_length_prefixed(cbb, &dh_p)) 1363 goto err; 1364 if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p))) 1365 goto err; 1366 BN_bn2bin(dh->p, data); 1367 1368 if (!CBB_add_u16_length_prefixed(cbb, &dh_g)) 1369 goto err; 1370 if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g))) 1371 goto err; 1372 BN_bn2bin(dh->g, data); 1373 1374 if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys)) 1375 goto err; 1376 if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key))) 1377 goto err; 1378 BN_bn2bin(dh->pub_key, data); 1379 1380 if (!CBB_flush(cbb)) 1381 goto err; 1382 1383 return (1); 1384 1385 fatal_err: 1386 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1387 err: 1388 return (-1); 1389 } 1390 1391 static int 1392 ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb) 1393 { 1394 uint16_t curve_id; 1395 EC_KEY *ecdh; 1396 CBB ecpoint; 1397 int al; 1398 1399 /* 1400 * Only named curves are supported in ECDH ephemeral key exchanges. 1401 * For supported named curves, curve_id is non-zero. 1402 */ 1403 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1404 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1405 goto err; 1406 } 1407 1408 if (S3I(s)->tmp.ecdh != NULL) { 1409 SSLerror(s, ERR_R_INTERNAL_ERROR); 1410 goto err; 1411 } 1412 1413 if ((S3I(s)->tmp.ecdh = EC_KEY_new()) == NULL) { 1414 al = SSL_AD_HANDSHAKE_FAILURE; 1415 SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY); 1416 goto fatal_err; 1417 } 1418 S3I(s)->tmp.ecdh_nid = nid; 1419 ecdh = S3I(s)->tmp.ecdh; 1420 1421 if (!ssl_kex_generate_ecdhe_ecp(ecdh, nid)) 1422 goto err; 1423 1424 /* 1425 * Encode the public key. 1426 * 1427 * Only named curves are supported in ECDH ephemeral key exchanges. 1428 * In this case the ServerKeyExchange message has: 1429 * [1 byte CurveType], [2 byte CurveName] 1430 * [1 byte length of encoded point], followed by 1431 * the actual encoded point itself. 1432 */ 1433 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1434 goto err; 1435 if (!CBB_add_u16(cbb, curve_id)) 1436 goto err; 1437 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1438 goto err; 1439 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 1440 goto err; 1441 if (!CBB_flush(cbb)) 1442 goto err; 1443 1444 return (1); 1445 1446 fatal_err: 1447 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1448 err: 1449 return (-1); 1450 } 1451 1452 static int 1453 ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb) 1454 { 1455 uint8_t *public_key = NULL, *private_key = NULL; 1456 uint16_t curve_id; 1457 CBB ecpoint; 1458 int ret = -1; 1459 1460 /* Generate an X25519 key pair. */ 1461 if (S3I(s)->tmp.x25519 != NULL) { 1462 SSLerror(s, ERR_R_INTERNAL_ERROR); 1463 goto err; 1464 } 1465 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 1466 goto err; 1467 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 1468 goto err; 1469 X25519_keypair(public_key, private_key); 1470 1471 /* Serialize public key. */ 1472 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1473 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1474 goto err; 1475 } 1476 1477 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1478 goto err; 1479 if (!CBB_add_u16(cbb, curve_id)) 1480 goto err; 1481 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1482 goto err; 1483 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 1484 goto err; 1485 if (!CBB_flush(cbb)) 1486 goto err; 1487 1488 S3I(s)->tmp.x25519 = private_key; 1489 private_key = NULL; 1490 ret = 1; 1491 1492 err: 1493 free(public_key); 1494 freezero(private_key, X25519_KEY_LENGTH); 1495 1496 return (ret); 1497 } 1498 1499 static int 1500 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) 1501 { 1502 int nid; 1503 1504 nid = tls1_get_shared_curve(s); 1505 1506 if (nid == NID_X25519) 1507 return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb); 1508 1509 return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb); 1510 } 1511 1512 int 1513 ssl3_send_server_key_exchange(SSL *s) 1514 { 1515 CBB cbb, cbb_params, cbb_signature, server_kex; 1516 const struct ssl_sigalg *sigalg = NULL; 1517 unsigned char *signature = NULL; 1518 size_t signature_len = 0; 1519 unsigned char *params = NULL; 1520 size_t params_len; 1521 const EVP_MD *md = NULL; 1522 unsigned long type; 1523 EVP_MD_CTX md_ctx; 1524 EVP_PKEY_CTX *pctx; 1525 EVP_PKEY *pkey; 1526 int al; 1527 1528 memset(&cbb, 0, sizeof(cbb)); 1529 memset(&cbb_params, 0, sizeof(cbb_params)); 1530 1531 EVP_MD_CTX_init(&md_ctx); 1532 1533 if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) { 1534 1535 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex, 1536 SSL3_MT_SERVER_KEY_EXCHANGE)) 1537 goto err; 1538 1539 if (!CBB_init(&cbb_params, 0)) 1540 goto err; 1541 1542 type = S3I(s)->hs.cipher->algorithm_mkey; 1543 if (type & SSL_kDHE) { 1544 if (ssl3_send_server_kex_dhe(s, &cbb_params) != 1) 1545 goto err; 1546 } else if (type & SSL_kECDHE) { 1547 if (ssl3_send_server_kex_ecdhe(s, &cbb_params) != 1) 1548 goto err; 1549 } else { 1550 al = SSL_AD_HANDSHAKE_FAILURE; 1551 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1552 goto fatal_err; 1553 } 1554 1555 if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len)) 1556 goto err; 1557 1558 if (!CBB_add_bytes(&server_kex, params, params_len)) 1559 goto err; 1560 1561 /* Add signature unless anonymous. */ 1562 if (!(S3I(s)->hs.cipher->algorithm_auth & SSL_aNULL)) { 1563 if ((pkey = ssl_get_sign_pkey(s, S3I(s)->hs.cipher, 1564 &md, &sigalg)) == NULL) { 1565 al = SSL_AD_DECODE_ERROR; 1566 goto fatal_err; 1567 } 1568 1569 /* Send signature algorithm. */ 1570 if (SSL_USE_SIGALGS(s)) { 1571 if (!CBB_add_u16(&server_kex, sigalg->value)) { 1572 al = SSL_AD_INTERNAL_ERROR; 1573 SSLerror(s, ERR_R_INTERNAL_ERROR); 1574 goto fatal_err; 1575 } 1576 } 1577 1578 if (!EVP_DigestSignInit(&md_ctx, &pctx, md, NULL, pkey)) { 1579 SSLerror(s, ERR_R_EVP_LIB); 1580 goto err; 1581 } 1582 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1583 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1584 RSA_PKCS1_PSS_PADDING) || 1585 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1586 SSLerror(s, ERR_R_EVP_LIB); 1587 goto err; 1588 } 1589 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->client_random, 1590 SSL3_RANDOM_SIZE)) { 1591 SSLerror(s, ERR_R_EVP_LIB); 1592 goto err; 1593 } 1594 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->server_random, 1595 SSL3_RANDOM_SIZE)) { 1596 SSLerror(s, ERR_R_EVP_LIB); 1597 goto err; 1598 } 1599 if (!EVP_DigestSignUpdate(&md_ctx, params, params_len)) { 1600 SSLerror(s, ERR_R_EVP_LIB); 1601 goto err; 1602 } 1603 if (!EVP_DigestSignFinal(&md_ctx, NULL, &signature_len) || 1604 !signature_len) { 1605 SSLerror(s, ERR_R_EVP_LIB); 1606 goto err; 1607 } 1608 if ((signature = calloc(1, signature_len)) == NULL) { 1609 SSLerror(s, ERR_R_MALLOC_FAILURE); 1610 goto err; 1611 } 1612 if (!EVP_DigestSignFinal(&md_ctx, signature, &signature_len)) { 1613 SSLerror(s, ERR_R_EVP_LIB); 1614 goto err; 1615 } 1616 1617 if (!CBB_add_u16_length_prefixed(&server_kex, 1618 &cbb_signature)) 1619 goto err; 1620 if (!CBB_add_bytes(&cbb_signature, signature, 1621 signature_len)) 1622 goto err; 1623 } 1624 1625 if (!ssl3_handshake_msg_finish(s, &cbb)) 1626 goto err; 1627 1628 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1629 } 1630 1631 EVP_MD_CTX_cleanup(&md_ctx); 1632 free(params); 1633 free(signature); 1634 1635 return (ssl3_handshake_write(s)); 1636 1637 fatal_err: 1638 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1639 err: 1640 CBB_cleanup(&cbb_params); 1641 CBB_cleanup(&cbb); 1642 EVP_MD_CTX_cleanup(&md_ctx); 1643 free(params); 1644 free(signature); 1645 1646 return (-1); 1647 } 1648 1649 int 1650 ssl3_send_certificate_request(SSL *s) 1651 { 1652 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1653 STACK_OF(X509_NAME) *sk = NULL; 1654 X509_NAME *name; 1655 int i; 1656 1657 /* 1658 * Certificate Request - RFC 5246 section 7.4.4. 1659 */ 1660 1661 memset(&cbb, 0, sizeof(cbb)); 1662 1663 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1664 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, 1665 SSL3_MT_CERTIFICATE_REQUEST)) 1666 goto err; 1667 1668 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1669 goto err; 1670 if (!ssl3_get_req_cert_types(s, &cert_types)) 1671 goto err; 1672 1673 if (SSL_USE_SIGALGS(s)) { 1674 if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs)) 1675 goto err; 1676 if (!ssl_sigalgs_build(&sigalgs, tls12_sigalgs, tls12_sigalgs_len)) 1677 goto err; 1678 } 1679 1680 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) 1681 goto err; 1682 1683 sk = SSL_get_client_CA_list(s); 1684 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1685 unsigned char *name_data; 1686 size_t name_len; 1687 1688 name = sk_X509_NAME_value(sk, i); 1689 name_len = i2d_X509_NAME(name, NULL); 1690 1691 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) 1692 goto err; 1693 if (!CBB_add_space(&dn, &name_data, name_len)) 1694 goto err; 1695 if (i2d_X509_NAME(name, &name_data) != name_len) 1696 goto err; 1697 } 1698 1699 if (!ssl3_handshake_msg_finish(s, &cbb)) 1700 goto err; 1701 1702 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B; 1703 } 1704 1705 /* SSL3_ST_SW_CERT_REQ_B */ 1706 return (ssl3_handshake_write(s)); 1707 1708 err: 1709 CBB_cleanup(&cbb); 1710 1711 return (-1); 1712 } 1713 1714 static int 1715 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs) 1716 { 1717 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; 1718 unsigned char *pms = NULL; 1719 unsigned char *p; 1720 size_t pms_len = 0; 1721 EVP_PKEY *pkey = NULL; 1722 RSA *rsa = NULL; 1723 CBS enc_pms; 1724 int decrypt_len; 1725 int al = -1; 1726 1727 arc4random_buf(fakekey, sizeof(fakekey)); 1728 1729 /* XXX - peer max protocol version. */ 1730 fakekey[0] = s->client_version >> 8; 1731 fakekey[1] = s->client_version & 0xff; 1732 1733 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey; 1734 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || 1735 (pkey->pkey.rsa == NULL)) { 1736 al = SSL_AD_HANDSHAKE_FAILURE; 1737 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); 1738 goto fatal_err; 1739 } 1740 rsa = pkey->pkey.rsa; 1741 1742 pms_len = RSA_size(rsa); 1743 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH) 1744 goto err; 1745 if ((pms = malloc(pms_len)) == NULL) 1746 goto err; 1747 p = pms; 1748 1749 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms)) 1750 goto decode_err; 1751 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) { 1752 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1753 goto err; 1754 } 1755 1756 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms), 1757 pms, rsa, RSA_PKCS1_PADDING); 1758 1759 ERR_clear_error(); 1760 1761 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) { 1762 al = SSL_AD_DECODE_ERROR; 1763 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ 1764 } 1765 1766 /* XXX - peer max version. */ 1767 if ((al == -1) && !((pms[0] == (s->client_version >> 8)) && 1768 (pms[1] == (s->client_version & 0xff)))) { 1769 /* 1770 * The premaster secret must contain the same version number 1771 * as the ClientHello to detect version rollback attacks 1772 * (strangely, the protocol does not offer such protection for 1773 * DH ciphersuites). 1774 * 1775 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack 1776 * (http://eprint.iacr.org/2003/052/) exploits the version 1777 * number check as a "bad version oracle" -- an alert would 1778 * reveal that the plaintext corresponding to some ciphertext 1779 * made up by the adversary is properly formatted except that 1780 * the version number is wrong. To avoid such attacks, we should 1781 * treat this just like any other decryption error. 1782 */ 1783 al = SSL_AD_DECODE_ERROR; 1784 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ 1785 } 1786 1787 if (al != -1) { 1788 /* 1789 * Some decryption failure -- use random value instead 1790 * as countermeasure against Bleichenbacher's attack 1791 * on PKCS #1 v1.5 RSA padding (see RFC 2246, 1792 * section 7.4.7.1). 1793 */ 1794 p = fakekey; 1795 } 1796 1797 if (!tls12_derive_master_secret(s, p, SSL_MAX_MASTER_KEY_LENGTH)) 1798 goto err; 1799 1800 freezero(pms, pms_len); 1801 1802 return (1); 1803 1804 decode_err: 1805 al = SSL_AD_DECODE_ERROR; 1806 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1807 fatal_err: 1808 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1809 err: 1810 freezero(pms, pms_len); 1811 1812 return (-1); 1813 } 1814 1815 static int 1816 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) 1817 { 1818 int key_size = 0; 1819 int key_is_invalid, key_len, al; 1820 unsigned char *key = NULL; 1821 BIGNUM *bn = NULL; 1822 CBS dh_Yc; 1823 DH *dh; 1824 1825 if (!CBS_get_u16_length_prefixed(cbs, &dh_Yc)) 1826 goto decode_err; 1827 if (CBS_len(cbs) != 0) 1828 goto decode_err; 1829 1830 if (S3I(s)->tmp.dh == NULL) { 1831 al = SSL_AD_HANDSHAKE_FAILURE; 1832 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1833 goto fatal_err; 1834 } 1835 dh = S3I(s)->tmp.dh; 1836 1837 if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) { 1838 SSLerror(s, SSL_R_BN_LIB); 1839 goto err; 1840 } 1841 1842 if ((key_size = DH_size(dh)) <= 0) { 1843 SSLerror(s, ERR_R_DH_LIB); 1844 goto err; 1845 } 1846 if ((key = malloc(key_size)) == NULL) { 1847 SSLerror(s, ERR_R_MALLOC_FAILURE); 1848 goto err; 1849 } 1850 if (!DH_check_pub_key(dh, bn, &key_is_invalid)) { 1851 al = SSL_AD_INTERNAL_ERROR; 1852 SSLerror(s, ERR_R_DH_LIB); 1853 goto fatal_err; 1854 } 1855 if (key_is_invalid) { 1856 al = SSL_AD_ILLEGAL_PARAMETER; 1857 SSLerror(s, ERR_R_DH_LIB); 1858 goto fatal_err; 1859 } 1860 if ((key_len = DH_compute_key(key, bn, dh)) <= 0) { 1861 al = SSL_AD_INTERNAL_ERROR; 1862 SSLerror(s, ERR_R_DH_LIB); 1863 goto fatal_err; 1864 } 1865 1866 if (!tls12_derive_master_secret(s, key, key_len)) 1867 goto err; 1868 1869 DH_free(S3I(s)->tmp.dh); 1870 S3I(s)->tmp.dh = NULL; 1871 1872 freezero(key, key_size); 1873 BN_clear_free(bn); 1874 1875 return (1); 1876 1877 decode_err: 1878 al = SSL_AD_DECODE_ERROR; 1879 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1880 fatal_err: 1881 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1882 err: 1883 freezero(key, key_size); 1884 BN_clear_free(bn); 1885 1886 return (-1); 1887 } 1888 1889 static int 1890 ssl3_get_client_kex_ecdhe_ecp(SSL *s, CBS *cbs) 1891 { 1892 uint8_t *key = NULL; 1893 size_t key_len = 0; 1894 EC_KEY *ecdh_peer = NULL; 1895 EC_KEY *ecdh; 1896 CBS public; 1897 int ret = -1; 1898 1899 /* 1900 * Use the ephemeral values we saved when generating the 1901 * ServerKeyExchange message. 1902 */ 1903 if ((ecdh = S3I(s)->tmp.ecdh) == NULL) { 1904 SSLerror(s, ERR_R_INTERNAL_ERROR); 1905 goto err; 1906 } 1907 1908 /* 1909 * Get client's public key from encoded point in the ClientKeyExchange 1910 * message. 1911 */ 1912 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1913 goto err; 1914 if (CBS_len(cbs) != 0) 1915 goto err; 1916 1917 if ((ecdh_peer = EC_KEY_new()) == NULL) 1918 goto err; 1919 1920 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh_peer, S3I(s)->tmp.ecdh_nid, 1921 &public)) 1922 goto err; 1923 1924 /* Derive the shared secret and compute master secret. */ 1925 if (!ssl_kex_derive_ecdhe_ecp(ecdh, ecdh_peer, &key, &key_len)) 1926 goto err; 1927 if (!tls12_derive_master_secret(s, key, key_len)) 1928 goto err; 1929 1930 EC_KEY_free(S3I(s)->tmp.ecdh); 1931 S3I(s)->tmp.ecdh = NULL; 1932 S3I(s)->tmp.ecdh_nid = NID_undef; 1933 1934 ret = 1; 1935 1936 err: 1937 freezero(key, key_len); 1938 EC_KEY_free(ecdh_peer); 1939 1940 return (ret); 1941 } 1942 1943 static int 1944 ssl3_get_client_kex_ecdhe_ecx(SSL *s, CBS *cbs) 1945 { 1946 uint8_t *shared_key = NULL; 1947 CBS ecpoint; 1948 int ret = -1; 1949 1950 if (!CBS_get_u8_length_prefixed(cbs, &ecpoint)) 1951 goto err; 1952 if (CBS_len(cbs) != 0) 1953 goto err; 1954 if (CBS_len(&ecpoint) != X25519_KEY_LENGTH) 1955 goto err; 1956 1957 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 1958 goto err; 1959 if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint))) 1960 goto err; 1961 1962 freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH); 1963 S3I(s)->tmp.x25519 = NULL; 1964 1965 if (!tls12_derive_master_secret(s, shared_key, X25519_KEY_LENGTH)) 1966 goto err; 1967 1968 ret = 1; 1969 1970 err: 1971 freezero(shared_key, X25519_KEY_LENGTH); 1972 1973 return (ret); 1974 } 1975 1976 static int 1977 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) 1978 { 1979 if (S3I(s)->tmp.x25519 != NULL) 1980 return ssl3_get_client_kex_ecdhe_ecx(s, cbs); 1981 1982 return ssl3_get_client_kex_ecdhe_ecp(s, cbs); 1983 } 1984 1985 static int 1986 ssl3_get_client_kex_gost(SSL *s, CBS *cbs) 1987 { 1988 EVP_PKEY_CTX *pkey_ctx; 1989 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; 1990 unsigned char premaster_secret[32]; 1991 unsigned long alg_a; 1992 size_t outlen = 32; 1993 CBS gostblob; 1994 int al; 1995 int ret = 0; 1996 1997 /* Get our certificate private key*/ 1998 alg_a = S3I(s)->hs.cipher->algorithm_auth; 1999 if (alg_a & SSL_aGOST01) 2000 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 2001 2002 if ((pkey_ctx = EVP_PKEY_CTX_new(pk, NULL)) == NULL) 2003 goto err; 2004 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) 2005 goto gerr; 2006 2007 /* 2008 * If client certificate is present and is of the same type, 2009 * maybe use it for key exchange. 2010 * Don't mind errors from EVP_PKEY_derive_set_peer, because 2011 * it is completely valid to use a client certificate for 2012 * authorization only. 2013 */ 2014 if ((client_pub_pkey = X509_get_pubkey(s->session->peer)) != NULL) { 2015 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2016 client_pub_pkey) <= 0) 2017 ERR_clear_error(); 2018 } 2019 2020 /* Decrypt session key */ 2021 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) 2022 goto decode_err; 2023 if (CBS_len(cbs) != 0) 2024 goto decode_err; 2025 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 2026 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { 2027 SSLerror(s, SSL_R_DECRYPTION_FAILED); 2028 goto gerr; 2029 } 2030 2031 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2032 goto err; 2033 2034 /* Check if pubkey from client certificate was used */ 2035 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, 2036 EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) 2037 ret = 2; 2038 else 2039 ret = 1; 2040 gerr: 2041 EVP_PKEY_free(client_pub_pkey); 2042 EVP_PKEY_CTX_free(pkey_ctx); 2043 if (ret) 2044 return (ret); 2045 else 2046 goto err; 2047 2048 decode_err: 2049 al = SSL_AD_DECODE_ERROR; 2050 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2051 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2052 err: 2053 return (-1); 2054 } 2055 2056 int 2057 ssl3_get_client_key_exchange(SSL *s) 2058 { 2059 unsigned long alg_k; 2060 int al, ok; 2061 CBS cbs; 2062 long n; 2063 2064 /* 2048 maxlen is a guess. How long a key does that permit? */ 2065 n = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 2066 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok); 2067 if (!ok) 2068 return ((int)n); 2069 2070 if (n < 0) 2071 goto err; 2072 2073 CBS_init(&cbs, s->internal->init_msg, n); 2074 2075 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2076 2077 if (alg_k & SSL_kRSA) { 2078 if (ssl3_get_client_kex_rsa(s, &cbs) != 1) 2079 goto err; 2080 } else if (alg_k & SSL_kDHE) { 2081 if (ssl3_get_client_kex_dhe(s, &cbs) != 1) 2082 goto err; 2083 } else if (alg_k & SSL_kECDHE) { 2084 if (ssl3_get_client_kex_ecdhe(s, &cbs) != 1) 2085 goto err; 2086 } else if (alg_k & SSL_kGOST) { 2087 if (ssl3_get_client_kex_gost(s, &cbs) != 1) 2088 goto err; 2089 } else { 2090 al = SSL_AD_HANDSHAKE_FAILURE; 2091 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 2092 goto fatal_err; 2093 } 2094 2095 if (CBS_len(&cbs) != 0) { 2096 al = SSL_AD_DECODE_ERROR; 2097 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2098 goto fatal_err; 2099 } 2100 2101 return (1); 2102 2103 fatal_err: 2104 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2105 err: 2106 return (-1); 2107 } 2108 2109 int 2110 ssl3_get_cert_verify(SSL *s) 2111 { 2112 CBS cbs, signature; 2113 const struct ssl_sigalg *sigalg = NULL; 2114 const EVP_MD *md = NULL; 2115 EVP_PKEY *pkey = NULL; 2116 X509 *peer = NULL; 2117 EVP_MD_CTX mctx; 2118 int al, ok, verify; 2119 const unsigned char *hdata; 2120 size_t hdatalen; 2121 int type = 0; 2122 int ret = 0; 2123 long n; 2124 2125 EVP_MD_CTX_init(&mctx); 2126 2127 n = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 2128 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok); 2129 if (!ok) 2130 return ((int)n); 2131 2132 if (n < 0) 2133 goto err; 2134 2135 CBS_init(&cbs, s->internal->init_msg, n); 2136 2137 if (s->session->peer != NULL) { 2138 peer = s->session->peer; 2139 pkey = X509_get_pubkey(peer); 2140 type = X509_certificate_type(peer, pkey); 2141 } 2142 2143 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 2144 S3I(s)->hs.tls12.reuse_message = 1; 2145 if (peer != NULL) { 2146 al = SSL_AD_UNEXPECTED_MESSAGE; 2147 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 2148 goto fatal_err; 2149 } 2150 ret = 1; 2151 goto end; 2152 } 2153 2154 if (peer == NULL) { 2155 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 2156 al = SSL_AD_UNEXPECTED_MESSAGE; 2157 goto fatal_err; 2158 } 2159 2160 if (!(type & EVP_PKT_SIGN)) { 2161 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 2162 al = SSL_AD_ILLEGAL_PARAMETER; 2163 goto fatal_err; 2164 } 2165 2166 if (S3I(s)->change_cipher_spec) { 2167 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 2168 al = SSL_AD_UNEXPECTED_MESSAGE; 2169 goto fatal_err; 2170 } 2171 2172 if (!SSL_USE_SIGALGS(s)) { 2173 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2174 goto err; 2175 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2176 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2177 al = SSL_AD_DECODE_ERROR; 2178 goto fatal_err; 2179 } 2180 if (CBS_len(&cbs) != 0) { 2181 al = SSL_AD_DECODE_ERROR; 2182 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2183 goto fatal_err; 2184 } 2185 } 2186 2187 if (SSL_USE_SIGALGS(s)) { 2188 EVP_PKEY_CTX *pctx; 2189 uint16_t sigalg_value; 2190 2191 if (!CBS_get_u16(&cbs, &sigalg_value)) 2192 goto decode_err; 2193 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 2194 tls12_sigalgs_len)) == NULL || 2195 (md = sigalg->md()) == NULL) { 2196 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2197 al = SSL_AD_DECODE_ERROR; 2198 goto fatal_err; 2199 } 2200 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 2201 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 2202 al = SSL_AD_DECODE_ERROR; 2203 goto fatal_err; 2204 } 2205 2206 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2207 goto err; 2208 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2209 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2210 al = SSL_AD_DECODE_ERROR; 2211 goto fatal_err; 2212 } 2213 if (CBS_len(&cbs) != 0) { 2214 al = SSL_AD_DECODE_ERROR; 2215 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2216 goto fatal_err; 2217 } 2218 2219 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2220 SSLerror(s, ERR_R_INTERNAL_ERROR); 2221 al = SSL_AD_INTERNAL_ERROR; 2222 goto fatal_err; 2223 } 2224 if (!EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, pkey)) { 2225 SSLerror(s, ERR_R_EVP_LIB); 2226 al = SSL_AD_INTERNAL_ERROR; 2227 goto fatal_err; 2228 } 2229 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2230 (!EVP_PKEY_CTX_set_rsa_padding 2231 (pctx, RSA_PKCS1_PSS_PADDING) || 2232 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2233 al = SSL_AD_INTERNAL_ERROR; 2234 goto fatal_err; 2235 } 2236 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2237 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2238 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, 2239 NULL) <= 0) { 2240 al = SSL_AD_INTERNAL_ERROR; 2241 goto fatal_err; 2242 } 2243 if (!EVP_DigestVerifyUpdate(&mctx, hdata, hdatalen)) { 2244 SSLerror(s, ERR_R_EVP_LIB); 2245 al = SSL_AD_INTERNAL_ERROR; 2246 goto fatal_err; 2247 } 2248 if (EVP_DigestVerifyFinal(&mctx, CBS_data(&signature), 2249 CBS_len(&signature)) <= 0) { 2250 al = SSL_AD_DECRYPT_ERROR; 2251 SSLerror(s, SSL_R_BAD_SIGNATURE); 2252 goto fatal_err; 2253 } 2254 } else if (pkey->type == EVP_PKEY_RSA) { 2255 verify = RSA_verify(NID_md5_sha1, S3I(s)->hs.tls12.cert_verify, 2256 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), 2257 CBS_len(&signature), pkey->pkey.rsa); 2258 if (verify < 0) { 2259 al = SSL_AD_DECRYPT_ERROR; 2260 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2261 goto fatal_err; 2262 } 2263 if (verify == 0) { 2264 al = SSL_AD_DECRYPT_ERROR; 2265 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2266 goto fatal_err; 2267 } 2268 } else if (pkey->type == EVP_PKEY_EC) { 2269 verify = ECDSA_verify(pkey->save_type, 2270 &(S3I(s)->hs.tls12.cert_verify[MD5_DIGEST_LENGTH]), 2271 SHA_DIGEST_LENGTH, CBS_data(&signature), 2272 CBS_len(&signature), pkey->pkey.ec); 2273 if (verify <= 0) { 2274 al = SSL_AD_DECRYPT_ERROR; 2275 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2276 goto fatal_err; 2277 } 2278 #ifndef OPENSSL_NO_GOST 2279 } else if (pkey->type == NID_id_GostR3410_94 || 2280 pkey->type == NID_id_GostR3410_2001) { 2281 unsigned char sigbuf[128]; 2282 unsigned int siglen = sizeof(sigbuf); 2283 EVP_PKEY_CTX *pctx; 2284 int nid; 2285 2286 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2287 SSLerror(s, ERR_R_INTERNAL_ERROR); 2288 al = SSL_AD_INTERNAL_ERROR; 2289 goto fatal_err; 2290 } 2291 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2292 !(md = EVP_get_digestbynid(nid))) { 2293 SSLerror(s, ERR_R_EVP_LIB); 2294 al = SSL_AD_INTERNAL_ERROR; 2295 goto fatal_err; 2296 } 2297 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 2298 SSLerror(s, ERR_R_EVP_LIB); 2299 al = SSL_AD_INTERNAL_ERROR; 2300 goto fatal_err; 2301 } 2302 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2303 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2304 !EVP_DigestFinal(&mctx, sigbuf, &siglen) || 2305 (EVP_PKEY_verify_init(pctx) <= 0) || 2306 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2307 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2308 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2309 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { 2310 SSLerror(s, ERR_R_EVP_LIB); 2311 al = SSL_AD_INTERNAL_ERROR; 2312 EVP_PKEY_CTX_free(pctx); 2313 goto fatal_err; 2314 } 2315 if (EVP_PKEY_verify(pctx, CBS_data(&signature), 2316 CBS_len(&signature), sigbuf, siglen) <= 0) { 2317 al = SSL_AD_DECRYPT_ERROR; 2318 SSLerror(s, SSL_R_BAD_SIGNATURE); 2319 EVP_PKEY_CTX_free(pctx); 2320 goto fatal_err; 2321 } 2322 2323 EVP_PKEY_CTX_free(pctx); 2324 #endif 2325 } else { 2326 SSLerror(s, ERR_R_INTERNAL_ERROR); 2327 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2328 goto fatal_err; 2329 } 2330 2331 ret = 1; 2332 if (0) { 2333 decode_err: 2334 al = SSL_AD_DECODE_ERROR; 2335 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2336 fatal_err: 2337 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2338 } 2339 end: 2340 tls1_transcript_free(s); 2341 err: 2342 EVP_MD_CTX_cleanup(&mctx); 2343 EVP_PKEY_free(pkey); 2344 return (ret); 2345 } 2346 2347 int 2348 ssl3_get_client_certificate(SSL *s) 2349 { 2350 CBS cbs, client_certs; 2351 int i, ok, al, ret = -1; 2352 X509 *x = NULL; 2353 long n; 2354 const unsigned char *q; 2355 STACK_OF(X509) *sk = NULL; 2356 2357 n = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2358 -1, s->internal->max_cert_list, &ok); 2359 if (!ok) 2360 return ((int)n); 2361 2362 if (S3I(s)->hs.tls12.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2363 if ((s->verify_mode & SSL_VERIFY_PEER) && 2364 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2365 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2366 al = SSL_AD_HANDSHAKE_FAILURE; 2367 goto fatal_err; 2368 } 2369 /* 2370 * If tls asked for a client cert, 2371 * the client must return a 0 list. 2372 */ 2373 if (S3I(s)->hs.tls12.cert_request) { 2374 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 2375 ); 2376 al = SSL_AD_UNEXPECTED_MESSAGE; 2377 goto fatal_err; 2378 } 2379 S3I(s)->hs.tls12.reuse_message = 1; 2380 return (1); 2381 } 2382 2383 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 2384 al = SSL_AD_UNEXPECTED_MESSAGE; 2385 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2386 goto fatal_err; 2387 } 2388 2389 if (n < 0) 2390 goto decode_err; 2391 2392 CBS_init(&cbs, s->internal->init_msg, n); 2393 2394 if ((sk = sk_X509_new_null()) == NULL) { 2395 SSLerror(s, ERR_R_MALLOC_FAILURE); 2396 goto err; 2397 } 2398 2399 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) || 2400 CBS_len(&cbs) != 0) 2401 goto decode_err; 2402 2403 while (CBS_len(&client_certs) > 0) { 2404 CBS cert; 2405 2406 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) { 2407 al = SSL_AD_DECODE_ERROR; 2408 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2409 goto fatal_err; 2410 } 2411 2412 q = CBS_data(&cert); 2413 x = d2i_X509(NULL, &q, CBS_len(&cert)); 2414 if (x == NULL) { 2415 SSLerror(s, ERR_R_ASN1_LIB); 2416 goto err; 2417 } 2418 if (q != CBS_data(&cert) + CBS_len(&cert)) { 2419 al = SSL_AD_DECODE_ERROR; 2420 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2421 goto fatal_err; 2422 } 2423 if (!sk_X509_push(sk, x)) { 2424 SSLerror(s, ERR_R_MALLOC_FAILURE); 2425 goto err; 2426 } 2427 x = NULL; 2428 } 2429 2430 if (sk_X509_num(sk) <= 0) { 2431 /* 2432 * TLS does not mind 0 certs returned. 2433 * Fail for TLS only if we required a certificate. 2434 */ 2435 if ((s->verify_mode & SSL_VERIFY_PEER) && 2436 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2437 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2438 al = SSL_AD_HANDSHAKE_FAILURE; 2439 goto fatal_err; 2440 } 2441 /* No client certificate so free transcript. */ 2442 tls1_transcript_free(s); 2443 } else { 2444 i = ssl_verify_cert_chain(s, sk); 2445 if (i <= 0) { 2446 al = ssl_verify_alarm_type(s->verify_result); 2447 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2448 goto fatal_err; 2449 } 2450 } 2451 2452 X509_free(s->session->peer); 2453 s->session->peer = sk_X509_shift(sk); 2454 s->session->verify_result = s->verify_result; 2455 2456 /* 2457 * With the current implementation, sess_cert will always be NULL 2458 * when we arrive here 2459 */ 2460 if (SSI(s)->sess_cert == NULL) { 2461 SSI(s)->sess_cert = ssl_sess_cert_new(); 2462 if (SSI(s)->sess_cert == NULL) { 2463 SSLerror(s, ERR_R_MALLOC_FAILURE); 2464 goto err; 2465 } 2466 } 2467 sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free); 2468 SSI(s)->sess_cert->cert_chain = sk; 2469 2470 /* 2471 * Inconsistency alert: cert_chain does *not* include the 2472 * peer's own certificate, while we do include it in s3_clnt.c 2473 */ 2474 2475 sk = NULL; 2476 2477 ret = 1; 2478 if (0) { 2479 decode_err: 2480 al = SSL_AD_DECODE_ERROR; 2481 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2482 fatal_err: 2483 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2484 } 2485 err: 2486 X509_free(x); 2487 sk_X509_pop_free(sk, X509_free); 2488 2489 return (ret); 2490 } 2491 2492 int 2493 ssl3_send_server_certificate(SSL *s) 2494 { 2495 CBB cbb, server_cert; 2496 CERT_PKEY *cpk; 2497 2498 /* 2499 * Server Certificate - RFC 5246, section 7.4.2. 2500 */ 2501 2502 memset(&cbb, 0, sizeof(cbb)); 2503 2504 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) { 2505 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { 2506 SSLerror(s, ERR_R_INTERNAL_ERROR); 2507 return (0); 2508 } 2509 2510 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, 2511 SSL3_MT_CERTIFICATE)) 2512 goto err; 2513 if (!ssl3_output_cert_chain(s, &server_cert, cpk)) 2514 goto err; 2515 if (!ssl3_handshake_msg_finish(s, &cbb)) 2516 goto err; 2517 2518 S3I(s)->hs.state = SSL3_ST_SW_CERT_B; 2519 } 2520 2521 /* SSL3_ST_SW_CERT_B */ 2522 return (ssl3_handshake_write(s)); 2523 2524 err: 2525 CBB_cleanup(&cbb); 2526 2527 return (0); 2528 } 2529 2530 /* send a new session ticket (not necessarily for a new session) */ 2531 int 2532 ssl3_send_newsession_ticket(SSL *s) 2533 { 2534 CBB cbb, session_ticket, ticket; 2535 SSL_CTX *tctx = s->initial_ctx; 2536 size_t enc_session_len, enc_session_max_len, hmac_len; 2537 size_t session_len = 0; 2538 unsigned char *enc_session = NULL, *session = NULL; 2539 unsigned char iv[EVP_MAX_IV_LENGTH]; 2540 unsigned char key_name[16]; 2541 unsigned char *hmac; 2542 unsigned int hlen; 2543 EVP_CIPHER_CTX ctx; 2544 HMAC_CTX hctx; 2545 int len; 2546 2547 /* 2548 * New Session Ticket - RFC 5077, section 3.3. 2549 */ 2550 2551 EVP_CIPHER_CTX_init(&ctx); 2552 HMAC_CTX_init(&hctx); 2553 2554 memset(&cbb, 0, sizeof(cbb)); 2555 2556 if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2557 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, 2558 SSL3_MT_NEWSESSION_TICKET)) 2559 goto err; 2560 2561 if (!SSL_SESSION_ticket(s->session, &session, &session_len)) 2562 goto err; 2563 if (session_len > 0xffff) 2564 goto err; 2565 2566 /* 2567 * Initialize HMAC and cipher contexts. If callback is present 2568 * it does all the work, otherwise use generated values from 2569 * parent context. 2570 */ 2571 if (tctx->internal->tlsext_ticket_key_cb != NULL) { 2572 if (tctx->internal->tlsext_ticket_key_cb(s, 2573 key_name, iv, &ctx, &hctx, 1) < 0) { 2574 EVP_CIPHER_CTX_cleanup(&ctx); 2575 goto err; 2576 } 2577 } else { 2578 arc4random_buf(iv, 16); 2579 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 2580 tctx->internal->tlsext_tick_aes_key, iv); 2581 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key, 2582 16, EVP_sha256(), NULL); 2583 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); 2584 } 2585 2586 /* Encrypt the session state. */ 2587 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; 2588 if ((enc_session = calloc(1, enc_session_max_len)) == NULL) 2589 goto err; 2590 enc_session_len = 0; 2591 if (!EVP_EncryptUpdate(&ctx, enc_session, &len, session, 2592 session_len)) 2593 goto err; 2594 enc_session_len += len; 2595 if (!EVP_EncryptFinal_ex(&ctx, enc_session + enc_session_len, 2596 &len)) 2597 goto err; 2598 enc_session_len += len; 2599 2600 if (enc_session_len > enc_session_max_len) 2601 goto err; 2602 2603 /* Generate the HMAC. */ 2604 if (!HMAC_Update(&hctx, key_name, sizeof(key_name))) 2605 goto err; 2606 if (!HMAC_Update(&hctx, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2607 goto err; 2608 if (!HMAC_Update(&hctx, enc_session, enc_session_len)) 2609 goto err; 2610 2611 if ((hmac_len = HMAC_size(&hctx)) <= 0) 2612 goto err; 2613 2614 /* 2615 * Ticket lifetime hint (advisory only): 2616 * We leave this unspecified for resumed session 2617 * (for simplicity), and guess that tickets for new 2618 * sessions will live as long as their sessions. 2619 */ 2620 if (!CBB_add_u32(&session_ticket, 2621 s->internal->hit ? 0 : s->session->timeout)) 2622 goto err; 2623 2624 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) 2625 goto err; 2626 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) 2627 goto err; 2628 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2629 goto err; 2630 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) 2631 goto err; 2632 if (!CBB_add_space(&ticket, &hmac, hmac_len)) 2633 goto err; 2634 2635 if (!HMAC_Final(&hctx, hmac, &hlen)) 2636 goto err; 2637 if (hlen != hmac_len) 2638 goto err; 2639 2640 if (!ssl3_handshake_msg_finish(s, &cbb)) 2641 goto err; 2642 2643 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2644 } 2645 2646 EVP_CIPHER_CTX_cleanup(&ctx); 2647 HMAC_CTX_cleanup(&hctx); 2648 freezero(session, session_len); 2649 free(enc_session); 2650 2651 /* SSL3_ST_SW_SESSION_TICKET_B */ 2652 return (ssl3_handshake_write(s)); 2653 2654 err: 2655 CBB_cleanup(&cbb); 2656 EVP_CIPHER_CTX_cleanup(&ctx); 2657 HMAC_CTX_cleanup(&hctx); 2658 freezero(session, session_len); 2659 free(enc_session); 2660 2661 return (-1); 2662 } 2663 2664 int 2665 ssl3_send_cert_status(SSL *s) 2666 { 2667 CBB cbb, certstatus, ocspresp; 2668 2669 memset(&cbb, 0, sizeof(cbb)); 2670 2671 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2672 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, 2673 SSL3_MT_CERTIFICATE_STATUS)) 2674 goto err; 2675 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2676 goto err; 2677 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2678 goto err; 2679 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, 2680 s->internal->tlsext_ocsp_resp_len)) 2681 goto err; 2682 if (!ssl3_handshake_msg_finish(s, &cbb)) 2683 goto err; 2684 2685 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2686 } 2687 2688 /* SSL3_ST_SW_CERT_STATUS_B */ 2689 return (ssl3_handshake_write(s)); 2690 2691 err: 2692 CBB_cleanup(&cbb); 2693 2694 return (-1); 2695 } 2696