1 /* $OpenBSD: ssl_srvr.c,v 1.117 2021/06/29 19:43:15 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 S3I(s)->hs.our_sigalg = sigalg; 1569 1570 /* Send signature algorithm. */ 1571 if (SSL_USE_SIGALGS(s)) { 1572 if (!CBB_add_u16(&server_kex, sigalg->value)) { 1573 al = SSL_AD_INTERNAL_ERROR; 1574 SSLerror(s, ERR_R_INTERNAL_ERROR); 1575 goto fatal_err; 1576 } 1577 } 1578 1579 if (!EVP_DigestSignInit(&md_ctx, &pctx, md, NULL, pkey)) { 1580 SSLerror(s, ERR_R_EVP_LIB); 1581 goto err; 1582 } 1583 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1584 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1585 RSA_PKCS1_PSS_PADDING) || 1586 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1587 SSLerror(s, ERR_R_EVP_LIB); 1588 goto err; 1589 } 1590 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->client_random, 1591 SSL3_RANDOM_SIZE)) { 1592 SSLerror(s, ERR_R_EVP_LIB); 1593 goto err; 1594 } 1595 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->server_random, 1596 SSL3_RANDOM_SIZE)) { 1597 SSLerror(s, ERR_R_EVP_LIB); 1598 goto err; 1599 } 1600 if (!EVP_DigestSignUpdate(&md_ctx, params, params_len)) { 1601 SSLerror(s, ERR_R_EVP_LIB); 1602 goto err; 1603 } 1604 if (!EVP_DigestSignFinal(&md_ctx, NULL, &signature_len) || 1605 !signature_len) { 1606 SSLerror(s, ERR_R_EVP_LIB); 1607 goto err; 1608 } 1609 if ((signature = calloc(1, signature_len)) == NULL) { 1610 SSLerror(s, ERR_R_MALLOC_FAILURE); 1611 goto err; 1612 } 1613 if (!EVP_DigestSignFinal(&md_ctx, signature, &signature_len)) { 1614 SSLerror(s, ERR_R_EVP_LIB); 1615 goto err; 1616 } 1617 1618 if (!CBB_add_u16_length_prefixed(&server_kex, 1619 &cbb_signature)) 1620 goto err; 1621 if (!CBB_add_bytes(&cbb_signature, signature, 1622 signature_len)) 1623 goto err; 1624 } 1625 1626 if (!ssl3_handshake_msg_finish(s, &cbb)) 1627 goto err; 1628 1629 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1630 } 1631 1632 EVP_MD_CTX_cleanup(&md_ctx); 1633 free(params); 1634 free(signature); 1635 1636 return (ssl3_handshake_write(s)); 1637 1638 fatal_err: 1639 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1640 err: 1641 CBB_cleanup(&cbb_params); 1642 CBB_cleanup(&cbb); 1643 EVP_MD_CTX_cleanup(&md_ctx); 1644 free(params); 1645 free(signature); 1646 1647 return (-1); 1648 } 1649 1650 int 1651 ssl3_send_certificate_request(SSL *s) 1652 { 1653 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1654 STACK_OF(X509_NAME) *sk = NULL; 1655 X509_NAME *name; 1656 int i; 1657 1658 /* 1659 * Certificate Request - RFC 5246 section 7.4.4. 1660 */ 1661 1662 memset(&cbb, 0, sizeof(cbb)); 1663 1664 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1665 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, 1666 SSL3_MT_CERTIFICATE_REQUEST)) 1667 goto err; 1668 1669 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1670 goto err; 1671 if (!ssl3_get_req_cert_types(s, &cert_types)) 1672 goto err; 1673 1674 if (SSL_USE_SIGALGS(s)) { 1675 if (!CBB_add_u16_length_prefixed(&cert_request, 1676 &sigalgs)) 1677 goto err; 1678 if (!ssl_sigalgs_build( 1679 S3I(s)->hs.negotiated_tls_version, &sigalgs)) 1680 goto err; 1681 } 1682 1683 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) 1684 goto err; 1685 1686 sk = SSL_get_client_CA_list(s); 1687 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1688 unsigned char *name_data; 1689 size_t name_len; 1690 1691 name = sk_X509_NAME_value(sk, i); 1692 name_len = i2d_X509_NAME(name, NULL); 1693 1694 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) 1695 goto err; 1696 if (!CBB_add_space(&dn, &name_data, name_len)) 1697 goto err; 1698 if (i2d_X509_NAME(name, &name_data) != name_len) 1699 goto err; 1700 } 1701 1702 if (!ssl3_handshake_msg_finish(s, &cbb)) 1703 goto err; 1704 1705 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B; 1706 } 1707 1708 /* SSL3_ST_SW_CERT_REQ_B */ 1709 return (ssl3_handshake_write(s)); 1710 1711 err: 1712 CBB_cleanup(&cbb); 1713 1714 return (-1); 1715 } 1716 1717 static int 1718 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs) 1719 { 1720 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; 1721 unsigned char *pms = NULL; 1722 unsigned char *p; 1723 size_t pms_len = 0; 1724 EVP_PKEY *pkey = NULL; 1725 RSA *rsa = NULL; 1726 CBS enc_pms; 1727 int decrypt_len; 1728 int al = -1; 1729 1730 arc4random_buf(fakekey, sizeof(fakekey)); 1731 1732 /* XXX - peer max protocol version. */ 1733 fakekey[0] = s->client_version >> 8; 1734 fakekey[1] = s->client_version & 0xff; 1735 1736 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey; 1737 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || 1738 (pkey->pkey.rsa == NULL)) { 1739 al = SSL_AD_HANDSHAKE_FAILURE; 1740 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); 1741 goto fatal_err; 1742 } 1743 rsa = pkey->pkey.rsa; 1744 1745 pms_len = RSA_size(rsa); 1746 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH) 1747 goto err; 1748 if ((pms = malloc(pms_len)) == NULL) 1749 goto err; 1750 p = pms; 1751 1752 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms)) 1753 goto decode_err; 1754 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) { 1755 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1756 goto err; 1757 } 1758 1759 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms), 1760 pms, rsa, RSA_PKCS1_PADDING); 1761 1762 ERR_clear_error(); 1763 1764 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) { 1765 al = SSL_AD_DECODE_ERROR; 1766 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ 1767 } 1768 1769 /* XXX - peer max version. */ 1770 if ((al == -1) && !((pms[0] == (s->client_version >> 8)) && 1771 (pms[1] == (s->client_version & 0xff)))) { 1772 /* 1773 * The premaster secret must contain the same version number 1774 * as the ClientHello to detect version rollback attacks 1775 * (strangely, the protocol does not offer such protection for 1776 * DH ciphersuites). 1777 * 1778 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack 1779 * (http://eprint.iacr.org/2003/052/) exploits the version 1780 * number check as a "bad version oracle" -- an alert would 1781 * reveal that the plaintext corresponding to some ciphertext 1782 * made up by the adversary is properly formatted except that 1783 * the version number is wrong. To avoid such attacks, we should 1784 * treat this just like any other decryption error. 1785 */ 1786 al = SSL_AD_DECODE_ERROR; 1787 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ 1788 } 1789 1790 if (al != -1) { 1791 /* 1792 * Some decryption failure -- use random value instead 1793 * as countermeasure against Bleichenbacher's attack 1794 * on PKCS #1 v1.5 RSA padding (see RFC 2246, 1795 * section 7.4.7.1). 1796 */ 1797 p = fakekey; 1798 } 1799 1800 if (!tls12_derive_master_secret(s, p, SSL_MAX_MASTER_KEY_LENGTH)) 1801 goto err; 1802 1803 freezero(pms, pms_len); 1804 1805 return (1); 1806 1807 decode_err: 1808 al = SSL_AD_DECODE_ERROR; 1809 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1810 fatal_err: 1811 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1812 err: 1813 freezero(pms, pms_len); 1814 1815 return (-1); 1816 } 1817 1818 static int 1819 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) 1820 { 1821 int key_size = 0; 1822 int key_is_invalid, key_len, al; 1823 unsigned char *key = NULL; 1824 BIGNUM *bn = NULL; 1825 CBS dh_Yc; 1826 DH *dh; 1827 1828 if (!CBS_get_u16_length_prefixed(cbs, &dh_Yc)) 1829 goto decode_err; 1830 if (CBS_len(cbs) != 0) 1831 goto decode_err; 1832 1833 if (S3I(s)->tmp.dh == NULL) { 1834 al = SSL_AD_HANDSHAKE_FAILURE; 1835 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1836 goto fatal_err; 1837 } 1838 dh = S3I(s)->tmp.dh; 1839 1840 if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) { 1841 SSLerror(s, SSL_R_BN_LIB); 1842 goto err; 1843 } 1844 1845 if ((key_size = DH_size(dh)) <= 0) { 1846 SSLerror(s, ERR_R_DH_LIB); 1847 goto err; 1848 } 1849 if ((key = malloc(key_size)) == NULL) { 1850 SSLerror(s, ERR_R_MALLOC_FAILURE); 1851 goto err; 1852 } 1853 if (!DH_check_pub_key(dh, bn, &key_is_invalid)) { 1854 al = SSL_AD_INTERNAL_ERROR; 1855 SSLerror(s, ERR_R_DH_LIB); 1856 goto fatal_err; 1857 } 1858 if (key_is_invalid) { 1859 al = SSL_AD_ILLEGAL_PARAMETER; 1860 SSLerror(s, ERR_R_DH_LIB); 1861 goto fatal_err; 1862 } 1863 if ((key_len = DH_compute_key(key, bn, dh)) <= 0) { 1864 al = SSL_AD_INTERNAL_ERROR; 1865 SSLerror(s, ERR_R_DH_LIB); 1866 goto fatal_err; 1867 } 1868 1869 if (!tls12_derive_master_secret(s, key, key_len)) 1870 goto err; 1871 1872 DH_free(S3I(s)->tmp.dh); 1873 S3I(s)->tmp.dh = NULL; 1874 1875 freezero(key, key_size); 1876 BN_clear_free(bn); 1877 1878 return (1); 1879 1880 decode_err: 1881 al = SSL_AD_DECODE_ERROR; 1882 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1883 fatal_err: 1884 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1885 err: 1886 freezero(key, key_size); 1887 BN_clear_free(bn); 1888 1889 return (-1); 1890 } 1891 1892 static int 1893 ssl3_get_client_kex_ecdhe_ecp(SSL *s, CBS *cbs) 1894 { 1895 uint8_t *key = NULL; 1896 size_t key_len = 0; 1897 EC_KEY *ecdh_peer = NULL; 1898 EC_KEY *ecdh; 1899 CBS public; 1900 int ret = -1; 1901 1902 /* 1903 * Use the ephemeral values we saved when generating the 1904 * ServerKeyExchange message. 1905 */ 1906 if ((ecdh = S3I(s)->tmp.ecdh) == NULL) { 1907 SSLerror(s, ERR_R_INTERNAL_ERROR); 1908 goto err; 1909 } 1910 1911 /* 1912 * Get client's public key from encoded point in the ClientKeyExchange 1913 * message. 1914 */ 1915 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1916 goto err; 1917 if (CBS_len(cbs) != 0) 1918 goto err; 1919 1920 if ((ecdh_peer = EC_KEY_new()) == NULL) 1921 goto err; 1922 1923 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh_peer, S3I(s)->tmp.ecdh_nid, 1924 &public)) 1925 goto err; 1926 1927 /* Derive the shared secret and compute master secret. */ 1928 if (!ssl_kex_derive_ecdhe_ecp(ecdh, ecdh_peer, &key, &key_len)) 1929 goto err; 1930 if (!tls12_derive_master_secret(s, key, key_len)) 1931 goto err; 1932 1933 EC_KEY_free(S3I(s)->tmp.ecdh); 1934 S3I(s)->tmp.ecdh = NULL; 1935 S3I(s)->tmp.ecdh_nid = NID_undef; 1936 1937 ret = 1; 1938 1939 err: 1940 freezero(key, key_len); 1941 EC_KEY_free(ecdh_peer); 1942 1943 return (ret); 1944 } 1945 1946 static int 1947 ssl3_get_client_kex_ecdhe_ecx(SSL *s, CBS *cbs) 1948 { 1949 uint8_t *shared_key = NULL; 1950 CBS ecpoint; 1951 int ret = -1; 1952 1953 if (!CBS_get_u8_length_prefixed(cbs, &ecpoint)) 1954 goto err; 1955 if (CBS_len(cbs) != 0) 1956 goto err; 1957 if (CBS_len(&ecpoint) != X25519_KEY_LENGTH) 1958 goto err; 1959 1960 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 1961 goto err; 1962 if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint))) 1963 goto err; 1964 1965 freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH); 1966 S3I(s)->tmp.x25519 = NULL; 1967 1968 if (!tls12_derive_master_secret(s, shared_key, X25519_KEY_LENGTH)) 1969 goto err; 1970 1971 ret = 1; 1972 1973 err: 1974 freezero(shared_key, X25519_KEY_LENGTH); 1975 1976 return (ret); 1977 } 1978 1979 static int 1980 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) 1981 { 1982 if (S3I(s)->tmp.x25519 != NULL) 1983 return ssl3_get_client_kex_ecdhe_ecx(s, cbs); 1984 1985 return ssl3_get_client_kex_ecdhe_ecp(s, cbs); 1986 } 1987 1988 static int 1989 ssl3_get_client_kex_gost(SSL *s, CBS *cbs) 1990 { 1991 EVP_PKEY_CTX *pkey_ctx; 1992 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; 1993 unsigned char premaster_secret[32]; 1994 unsigned long alg_a; 1995 size_t outlen = 32; 1996 CBS gostblob; 1997 int al; 1998 int ret = 0; 1999 2000 /* Get our certificate private key*/ 2001 alg_a = S3I(s)->hs.cipher->algorithm_auth; 2002 if (alg_a & SSL_aGOST01) 2003 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 2004 2005 if ((pkey_ctx = EVP_PKEY_CTX_new(pk, NULL)) == NULL) 2006 goto err; 2007 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) 2008 goto gerr; 2009 2010 /* 2011 * If client certificate is present and is of the same type, 2012 * maybe use it for key exchange. 2013 * Don't mind errors from EVP_PKEY_derive_set_peer, because 2014 * it is completely valid to use a client certificate for 2015 * authorization only. 2016 */ 2017 if ((client_pub_pkey = X509_get_pubkey(s->session->peer)) != NULL) { 2018 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2019 client_pub_pkey) <= 0) 2020 ERR_clear_error(); 2021 } 2022 2023 /* Decrypt session key */ 2024 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) 2025 goto decode_err; 2026 if (CBS_len(cbs) != 0) 2027 goto decode_err; 2028 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 2029 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { 2030 SSLerror(s, SSL_R_DECRYPTION_FAILED); 2031 goto gerr; 2032 } 2033 2034 if (!tls12_derive_master_secret(s, premaster_secret, 32)) 2035 goto err; 2036 2037 /* Check if pubkey from client certificate was used */ 2038 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, 2039 EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) 2040 ret = 2; 2041 else 2042 ret = 1; 2043 gerr: 2044 EVP_PKEY_free(client_pub_pkey); 2045 EVP_PKEY_CTX_free(pkey_ctx); 2046 if (ret) 2047 return (ret); 2048 else 2049 goto err; 2050 2051 decode_err: 2052 al = SSL_AD_DECODE_ERROR; 2053 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2054 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2055 err: 2056 return (-1); 2057 } 2058 2059 int 2060 ssl3_get_client_key_exchange(SSL *s) 2061 { 2062 unsigned long alg_k; 2063 int al, ok; 2064 CBS cbs; 2065 long n; 2066 2067 /* 2048 maxlen is a guess. How long a key does that permit? */ 2068 n = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 2069 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok); 2070 if (!ok) 2071 return ((int)n); 2072 2073 if (n < 0) 2074 goto err; 2075 2076 CBS_init(&cbs, s->internal->init_msg, n); 2077 2078 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2079 2080 if (alg_k & SSL_kRSA) { 2081 if (ssl3_get_client_kex_rsa(s, &cbs) != 1) 2082 goto err; 2083 } else if (alg_k & SSL_kDHE) { 2084 if (ssl3_get_client_kex_dhe(s, &cbs) != 1) 2085 goto err; 2086 } else if (alg_k & SSL_kECDHE) { 2087 if (ssl3_get_client_kex_ecdhe(s, &cbs) != 1) 2088 goto err; 2089 } else if (alg_k & SSL_kGOST) { 2090 if (ssl3_get_client_kex_gost(s, &cbs) != 1) 2091 goto err; 2092 } else { 2093 al = SSL_AD_HANDSHAKE_FAILURE; 2094 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 2095 goto fatal_err; 2096 } 2097 2098 if (CBS_len(&cbs) != 0) { 2099 al = SSL_AD_DECODE_ERROR; 2100 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2101 goto fatal_err; 2102 } 2103 2104 return (1); 2105 2106 fatal_err: 2107 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2108 err: 2109 return (-1); 2110 } 2111 2112 int 2113 ssl3_get_cert_verify(SSL *s) 2114 { 2115 CBS cbs, signature; 2116 const struct ssl_sigalg *sigalg = NULL; 2117 uint16_t sigalg_value = SIGALG_NONE; 2118 EVP_PKEY *pkey = NULL; 2119 X509 *peer = NULL; 2120 EVP_MD_CTX mctx; 2121 int al, ok, verify; 2122 const unsigned char *hdata; 2123 size_t hdatalen; 2124 int type = 0; 2125 int ret = 0; 2126 long n; 2127 2128 EVP_MD_CTX_init(&mctx); 2129 2130 n = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 2131 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok); 2132 if (!ok) 2133 return ((int)n); 2134 2135 if (n < 0) 2136 goto err; 2137 2138 CBS_init(&cbs, s->internal->init_msg, n); 2139 2140 if (s->session->peer != NULL) { 2141 peer = s->session->peer; 2142 pkey = X509_get_pubkey(peer); 2143 type = X509_certificate_type(peer, pkey); 2144 } 2145 2146 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 2147 S3I(s)->hs.tls12.reuse_message = 1; 2148 if (peer != NULL) { 2149 al = SSL_AD_UNEXPECTED_MESSAGE; 2150 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 2151 goto fatal_err; 2152 } 2153 ret = 1; 2154 goto end; 2155 } 2156 2157 if (peer == NULL) { 2158 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 2159 al = SSL_AD_UNEXPECTED_MESSAGE; 2160 goto fatal_err; 2161 } 2162 2163 if (!(type & EVP_PKT_SIGN)) { 2164 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 2165 al = SSL_AD_ILLEGAL_PARAMETER; 2166 goto fatal_err; 2167 } 2168 2169 if (S3I(s)->change_cipher_spec) { 2170 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 2171 al = SSL_AD_UNEXPECTED_MESSAGE; 2172 goto fatal_err; 2173 } 2174 2175 if (SSL_USE_SIGALGS(s)) { 2176 if (!CBS_get_u16(&cbs, &sigalg_value)) 2177 goto decode_err; 2178 } 2179 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2180 goto err; 2181 if (CBS_len(&cbs) != 0) { 2182 al = SSL_AD_DECODE_ERROR; 2183 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2184 goto fatal_err; 2185 } 2186 2187 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2188 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2189 al = SSL_AD_DECODE_ERROR; 2190 goto fatal_err; 2191 } 2192 2193 if ((sigalg = ssl_sigalg_for_peer(s, pkey, 2194 sigalg_value)) == NULL) { 2195 al = SSL_AD_DECODE_ERROR; 2196 goto fatal_err; 2197 } 2198 S3I(s)->hs.peer_sigalg = sigalg; 2199 2200 if (SSL_USE_SIGALGS(s)) { 2201 EVP_PKEY_CTX *pctx; 2202 2203 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2204 SSLerror(s, ERR_R_INTERNAL_ERROR); 2205 al = SSL_AD_INTERNAL_ERROR; 2206 goto fatal_err; 2207 } 2208 if (!EVP_DigestVerifyInit(&mctx, &pctx, sigalg->md(), 2209 NULL, pkey)) { 2210 SSLerror(s, ERR_R_EVP_LIB); 2211 al = SSL_AD_INTERNAL_ERROR; 2212 goto fatal_err; 2213 } 2214 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2215 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 2216 RSA_PKCS1_PSS_PADDING) || 2217 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2218 al = SSL_AD_INTERNAL_ERROR; 2219 goto fatal_err; 2220 } 2221 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2222 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2223 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, 2224 NULL) <= 0) { 2225 al = SSL_AD_INTERNAL_ERROR; 2226 goto fatal_err; 2227 } 2228 if (!EVP_DigestVerifyUpdate(&mctx, hdata, hdatalen)) { 2229 SSLerror(s, ERR_R_EVP_LIB); 2230 al = SSL_AD_INTERNAL_ERROR; 2231 goto fatal_err; 2232 } 2233 if (EVP_DigestVerifyFinal(&mctx, CBS_data(&signature), 2234 CBS_len(&signature)) <= 0) { 2235 al = SSL_AD_DECRYPT_ERROR; 2236 SSLerror(s, SSL_R_BAD_SIGNATURE); 2237 goto fatal_err; 2238 } 2239 } else if (pkey->type == EVP_PKEY_RSA) { 2240 verify = RSA_verify(NID_md5_sha1, S3I(s)->hs.tls12.cert_verify, 2241 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), 2242 CBS_len(&signature), pkey->pkey.rsa); 2243 if (verify < 0) { 2244 al = SSL_AD_DECRYPT_ERROR; 2245 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2246 goto fatal_err; 2247 } 2248 if (verify == 0) { 2249 al = SSL_AD_DECRYPT_ERROR; 2250 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2251 goto fatal_err; 2252 } 2253 } else if (pkey->type == EVP_PKEY_EC) { 2254 verify = ECDSA_verify(pkey->save_type, 2255 &(S3I(s)->hs.tls12.cert_verify[MD5_DIGEST_LENGTH]), 2256 SHA_DIGEST_LENGTH, CBS_data(&signature), 2257 CBS_len(&signature), pkey->pkey.ec); 2258 if (verify <= 0) { 2259 al = SSL_AD_DECRYPT_ERROR; 2260 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2261 goto fatal_err; 2262 } 2263 #ifndef OPENSSL_NO_GOST 2264 } else if (pkey->type == NID_id_GostR3410_94 || 2265 pkey->type == NID_id_GostR3410_2001) { 2266 unsigned char sigbuf[128]; 2267 unsigned int siglen = sizeof(sigbuf); 2268 EVP_PKEY_CTX *pctx; 2269 const EVP_MD *md; 2270 int nid; 2271 2272 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2273 SSLerror(s, ERR_R_INTERNAL_ERROR); 2274 al = SSL_AD_INTERNAL_ERROR; 2275 goto fatal_err; 2276 } 2277 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2278 !(md = EVP_get_digestbynid(nid))) { 2279 SSLerror(s, ERR_R_EVP_LIB); 2280 al = SSL_AD_INTERNAL_ERROR; 2281 goto fatal_err; 2282 } 2283 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 2284 SSLerror(s, ERR_R_EVP_LIB); 2285 al = SSL_AD_INTERNAL_ERROR; 2286 goto fatal_err; 2287 } 2288 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2289 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2290 !EVP_DigestFinal(&mctx, sigbuf, &siglen) || 2291 (EVP_PKEY_verify_init(pctx) <= 0) || 2292 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2293 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2294 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2295 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { 2296 SSLerror(s, ERR_R_EVP_LIB); 2297 al = SSL_AD_INTERNAL_ERROR; 2298 EVP_PKEY_CTX_free(pctx); 2299 goto fatal_err; 2300 } 2301 if (EVP_PKEY_verify(pctx, CBS_data(&signature), 2302 CBS_len(&signature), sigbuf, siglen) <= 0) { 2303 al = SSL_AD_DECRYPT_ERROR; 2304 SSLerror(s, SSL_R_BAD_SIGNATURE); 2305 EVP_PKEY_CTX_free(pctx); 2306 goto fatal_err; 2307 } 2308 2309 EVP_PKEY_CTX_free(pctx); 2310 #endif 2311 } else { 2312 SSLerror(s, ERR_R_INTERNAL_ERROR); 2313 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2314 goto fatal_err; 2315 } 2316 2317 ret = 1; 2318 if (0) { 2319 decode_err: 2320 al = SSL_AD_DECODE_ERROR; 2321 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2322 fatal_err: 2323 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2324 } 2325 end: 2326 tls1_transcript_free(s); 2327 err: 2328 EVP_MD_CTX_cleanup(&mctx); 2329 EVP_PKEY_free(pkey); 2330 return (ret); 2331 } 2332 2333 int 2334 ssl3_get_client_certificate(SSL *s) 2335 { 2336 CBS cbs, client_certs; 2337 int i, ok, al, ret = -1; 2338 X509 *x = NULL; 2339 long n; 2340 const unsigned char *q; 2341 STACK_OF(X509) *sk = NULL; 2342 2343 n = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2344 -1, s->internal->max_cert_list, &ok); 2345 if (!ok) 2346 return ((int)n); 2347 2348 if (S3I(s)->hs.tls12.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2349 if ((s->verify_mode & SSL_VERIFY_PEER) && 2350 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2351 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2352 al = SSL_AD_HANDSHAKE_FAILURE; 2353 goto fatal_err; 2354 } 2355 /* 2356 * If tls asked for a client cert, 2357 * the client must return a 0 list. 2358 */ 2359 if (S3I(s)->hs.tls12.cert_request) { 2360 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 2361 ); 2362 al = SSL_AD_UNEXPECTED_MESSAGE; 2363 goto fatal_err; 2364 } 2365 S3I(s)->hs.tls12.reuse_message = 1; 2366 return (1); 2367 } 2368 2369 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 2370 al = SSL_AD_UNEXPECTED_MESSAGE; 2371 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2372 goto fatal_err; 2373 } 2374 2375 if (n < 0) 2376 goto decode_err; 2377 2378 CBS_init(&cbs, s->internal->init_msg, n); 2379 2380 if ((sk = sk_X509_new_null()) == NULL) { 2381 SSLerror(s, ERR_R_MALLOC_FAILURE); 2382 goto err; 2383 } 2384 2385 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) || 2386 CBS_len(&cbs) != 0) 2387 goto decode_err; 2388 2389 while (CBS_len(&client_certs) > 0) { 2390 CBS cert; 2391 2392 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) { 2393 al = SSL_AD_DECODE_ERROR; 2394 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2395 goto fatal_err; 2396 } 2397 2398 q = CBS_data(&cert); 2399 x = d2i_X509(NULL, &q, CBS_len(&cert)); 2400 if (x == NULL) { 2401 SSLerror(s, ERR_R_ASN1_LIB); 2402 goto err; 2403 } 2404 if (q != CBS_data(&cert) + CBS_len(&cert)) { 2405 al = SSL_AD_DECODE_ERROR; 2406 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2407 goto fatal_err; 2408 } 2409 if (!sk_X509_push(sk, x)) { 2410 SSLerror(s, ERR_R_MALLOC_FAILURE); 2411 goto err; 2412 } 2413 x = NULL; 2414 } 2415 2416 if (sk_X509_num(sk) <= 0) { 2417 /* 2418 * TLS does not mind 0 certs returned. 2419 * Fail for TLS only if we required a certificate. 2420 */ 2421 if ((s->verify_mode & SSL_VERIFY_PEER) && 2422 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2423 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2424 al = SSL_AD_HANDSHAKE_FAILURE; 2425 goto fatal_err; 2426 } 2427 /* No client certificate so free transcript. */ 2428 tls1_transcript_free(s); 2429 } else { 2430 i = ssl_verify_cert_chain(s, sk); 2431 if (i <= 0) { 2432 al = ssl_verify_alarm_type(s->verify_result); 2433 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2434 goto fatal_err; 2435 } 2436 } 2437 2438 X509_free(s->session->peer); 2439 s->session->peer = sk_X509_shift(sk); 2440 s->session->verify_result = s->verify_result; 2441 2442 /* 2443 * With the current implementation, sess_cert will always be NULL 2444 * when we arrive here 2445 */ 2446 if (SSI(s)->sess_cert == NULL) { 2447 SSI(s)->sess_cert = ssl_sess_cert_new(); 2448 if (SSI(s)->sess_cert == NULL) { 2449 SSLerror(s, ERR_R_MALLOC_FAILURE); 2450 goto err; 2451 } 2452 } 2453 sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free); 2454 SSI(s)->sess_cert->cert_chain = sk; 2455 2456 /* 2457 * Inconsistency alert: cert_chain does *not* include the 2458 * peer's own certificate, while we do include it in s3_clnt.c 2459 */ 2460 2461 sk = NULL; 2462 2463 ret = 1; 2464 if (0) { 2465 decode_err: 2466 al = SSL_AD_DECODE_ERROR; 2467 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2468 fatal_err: 2469 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2470 } 2471 err: 2472 X509_free(x); 2473 sk_X509_pop_free(sk, X509_free); 2474 2475 return (ret); 2476 } 2477 2478 int 2479 ssl3_send_server_certificate(SSL *s) 2480 { 2481 CBB cbb, server_cert; 2482 CERT_PKEY *cpk; 2483 2484 /* 2485 * Server Certificate - RFC 5246, section 7.4.2. 2486 */ 2487 2488 memset(&cbb, 0, sizeof(cbb)); 2489 2490 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) { 2491 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { 2492 SSLerror(s, ERR_R_INTERNAL_ERROR); 2493 return (0); 2494 } 2495 2496 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, 2497 SSL3_MT_CERTIFICATE)) 2498 goto err; 2499 if (!ssl3_output_cert_chain(s, &server_cert, cpk)) 2500 goto err; 2501 if (!ssl3_handshake_msg_finish(s, &cbb)) 2502 goto err; 2503 2504 S3I(s)->hs.state = SSL3_ST_SW_CERT_B; 2505 } 2506 2507 /* SSL3_ST_SW_CERT_B */ 2508 return (ssl3_handshake_write(s)); 2509 2510 err: 2511 CBB_cleanup(&cbb); 2512 2513 return (0); 2514 } 2515 2516 /* send a new session ticket (not necessarily for a new session) */ 2517 int 2518 ssl3_send_newsession_ticket(SSL *s) 2519 { 2520 CBB cbb, session_ticket, ticket; 2521 SSL_CTX *tctx = s->initial_ctx; 2522 size_t enc_session_len, enc_session_max_len, hmac_len; 2523 size_t session_len = 0; 2524 unsigned char *enc_session = NULL, *session = NULL; 2525 unsigned char iv[EVP_MAX_IV_LENGTH]; 2526 unsigned char key_name[16]; 2527 unsigned char *hmac; 2528 unsigned int hlen; 2529 EVP_CIPHER_CTX ctx; 2530 HMAC_CTX hctx; 2531 int len; 2532 2533 /* 2534 * New Session Ticket - RFC 5077, section 3.3. 2535 */ 2536 2537 EVP_CIPHER_CTX_init(&ctx); 2538 HMAC_CTX_init(&hctx); 2539 2540 memset(&cbb, 0, sizeof(cbb)); 2541 2542 if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2543 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, 2544 SSL3_MT_NEWSESSION_TICKET)) 2545 goto err; 2546 2547 if (!SSL_SESSION_ticket(s->session, &session, &session_len)) 2548 goto err; 2549 if (session_len > 0xffff) 2550 goto err; 2551 2552 /* 2553 * Initialize HMAC and cipher contexts. If callback is present 2554 * it does all the work, otherwise use generated values from 2555 * parent context. 2556 */ 2557 if (tctx->internal->tlsext_ticket_key_cb != NULL) { 2558 if (tctx->internal->tlsext_ticket_key_cb(s, 2559 key_name, iv, &ctx, &hctx, 1) < 0) { 2560 EVP_CIPHER_CTX_cleanup(&ctx); 2561 goto err; 2562 } 2563 } else { 2564 arc4random_buf(iv, 16); 2565 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 2566 tctx->internal->tlsext_tick_aes_key, iv); 2567 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key, 2568 16, EVP_sha256(), NULL); 2569 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); 2570 } 2571 2572 /* Encrypt the session state. */ 2573 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; 2574 if ((enc_session = calloc(1, enc_session_max_len)) == NULL) 2575 goto err; 2576 enc_session_len = 0; 2577 if (!EVP_EncryptUpdate(&ctx, enc_session, &len, session, 2578 session_len)) 2579 goto err; 2580 enc_session_len += len; 2581 if (!EVP_EncryptFinal_ex(&ctx, enc_session + enc_session_len, 2582 &len)) 2583 goto err; 2584 enc_session_len += len; 2585 2586 if (enc_session_len > enc_session_max_len) 2587 goto err; 2588 2589 /* Generate the HMAC. */ 2590 if (!HMAC_Update(&hctx, key_name, sizeof(key_name))) 2591 goto err; 2592 if (!HMAC_Update(&hctx, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2593 goto err; 2594 if (!HMAC_Update(&hctx, enc_session, enc_session_len)) 2595 goto err; 2596 2597 if ((hmac_len = HMAC_size(&hctx)) <= 0) 2598 goto err; 2599 2600 /* 2601 * Ticket lifetime hint (advisory only): 2602 * We leave this unspecified for resumed session 2603 * (for simplicity), and guess that tickets for new 2604 * sessions will live as long as their sessions. 2605 */ 2606 if (!CBB_add_u32(&session_ticket, 2607 s->internal->hit ? 0 : s->session->timeout)) 2608 goto err; 2609 2610 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) 2611 goto err; 2612 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) 2613 goto err; 2614 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2615 goto err; 2616 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) 2617 goto err; 2618 if (!CBB_add_space(&ticket, &hmac, hmac_len)) 2619 goto err; 2620 2621 if (!HMAC_Final(&hctx, hmac, &hlen)) 2622 goto err; 2623 if (hlen != hmac_len) 2624 goto err; 2625 2626 if (!ssl3_handshake_msg_finish(s, &cbb)) 2627 goto err; 2628 2629 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2630 } 2631 2632 EVP_CIPHER_CTX_cleanup(&ctx); 2633 HMAC_CTX_cleanup(&hctx); 2634 freezero(session, session_len); 2635 free(enc_session); 2636 2637 /* SSL3_ST_SW_SESSION_TICKET_B */ 2638 return (ssl3_handshake_write(s)); 2639 2640 err: 2641 CBB_cleanup(&cbb); 2642 EVP_CIPHER_CTX_cleanup(&ctx); 2643 HMAC_CTX_cleanup(&hctx); 2644 freezero(session, session_len); 2645 free(enc_session); 2646 2647 return (-1); 2648 } 2649 2650 int 2651 ssl3_send_cert_status(SSL *s) 2652 { 2653 CBB cbb, certstatus, ocspresp; 2654 2655 memset(&cbb, 0, sizeof(cbb)); 2656 2657 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2658 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, 2659 SSL3_MT_CERTIFICATE_STATUS)) 2660 goto err; 2661 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2662 goto err; 2663 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2664 goto err; 2665 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, 2666 s->internal->tlsext_ocsp_resp_len)) 2667 goto err; 2668 if (!ssl3_handshake_msg_finish(s, &cbb)) 2669 goto err; 2670 2671 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2672 } 2673 2674 /* SSL3_ST_SW_CERT_STATUS_B */ 2675 return (ssl3_handshake_write(s)); 2676 2677 err: 2678 CBB_cleanup(&cbb); 2679 2680 return (-1); 2681 } 2682