1 /* $OpenBSD: ssl_srvr.c,v 1.104 2021/04/25 13:15:22 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 "ssl_locl.h" 154 155 #include <openssl/bn.h> 156 #include <openssl/buffer.h> 157 #include <openssl/curve25519.h> 158 #include <openssl/evp.h> 159 #include <openssl/dh.h> 160 #ifndef OPENSSL_NO_GOST 161 #include <openssl/gost.h> 162 #endif 163 #include <openssl/hmac.h> 164 #include <openssl/md5.h> 165 #include <openssl/objects.h> 166 #include <openssl/x509.h> 167 168 #include "bytestring.h" 169 #include "ssl_sigalgs.h" 170 #include "ssl_tlsext.h" 171 172 int 173 ssl3_accept(SSL *s) 174 { 175 void (*cb)(const SSL *ssl, int type, int val) = NULL; 176 unsigned long alg_k; 177 int ret = -1; 178 int new_state, state, skip = 0; 179 int listen = 0; 180 181 ERR_clear_error(); 182 errno = 0; 183 184 if (s->internal->info_callback != NULL) 185 cb = s->internal->info_callback; 186 else if (s->ctx->internal->info_callback != NULL) 187 cb = s->ctx->internal->info_callback; 188 189 if (SSL_is_dtls(s)) 190 listen = D1I(s)->listen; 191 192 /* init things to blank */ 193 s->internal->in_handshake++; 194 if (!SSL_in_init(s) || SSL_in_before(s)) 195 SSL_clear(s); 196 197 if (SSL_is_dtls(s)) 198 D1I(s)->listen = listen; 199 200 for (;;) { 201 state = S3I(s)->hs.state; 202 203 switch (S3I(s)->hs.state) { 204 case SSL_ST_RENEGOTIATE: 205 s->internal->renegotiate = 1; 206 /* S3I(s)->hs.state=SSL_ST_ACCEPT; */ 207 208 case SSL_ST_BEFORE: 209 case SSL_ST_ACCEPT: 210 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 211 case SSL_ST_OK|SSL_ST_ACCEPT: 212 s->server = 1; 213 if (cb != NULL) 214 cb(s, SSL_CB_HANDSHAKE_START, 1); 215 216 if (!ssl_legacy_stack_version(s, s->version)) { 217 SSLerror(s, ERR_R_INTERNAL_ERROR); 218 ret = -1; 219 goto end; 220 } 221 222 if (!ssl_supported_tls_version_range(s, 223 &S3I(s)->hs.our_min_tls_version, 224 &S3I(s)->hs.our_max_tls_version)) { 225 SSLerror(s, SSL_R_NO_PROTOCOLS_AVAILABLE); 226 ret = -1; 227 goto end; 228 } 229 230 if (!ssl3_setup_init_buffer(s)) { 231 ret = -1; 232 goto end; 233 } 234 if (!ssl3_setup_buffers(s)) { 235 ret = -1; 236 goto end; 237 } 238 239 s->internal->init_num = 0; 240 241 if (S3I(s)->hs.state != SSL_ST_RENEGOTIATE) { 242 /* 243 * Ok, we now need to push on a buffering BIO 244 * so that the output is sent in a way that 245 * TCP likes :-) 246 */ 247 if (!ssl_init_wbio_buffer(s, 1)) { 248 ret = -1; 249 goto end; 250 } 251 252 if (!tls1_transcript_init(s)) { 253 ret = -1; 254 goto end; 255 } 256 257 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_A; 258 s->ctx->internal->stats.sess_accept++; 259 } else if (!SSL_is_dtls(s) && !S3I(s)->send_connection_binding) { 260 /* 261 * Server attempting to renegotiate with 262 * client that doesn't support secure 263 * renegotiation. 264 */ 265 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 266 ssl3_send_alert(s, SSL3_AL_FATAL, 267 SSL_AD_HANDSHAKE_FAILURE); 268 ret = -1; 269 goto end; 270 } else { 271 /* 272 * S3I(s)->hs.state == SSL_ST_RENEGOTIATE, 273 * we will just send a HelloRequest. 274 */ 275 s->ctx->internal->stats.sess_accept_renegotiate++; 276 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_A; 277 } 278 break; 279 280 case SSL3_ST_SW_HELLO_REQ_A: 281 case SSL3_ST_SW_HELLO_REQ_B: 282 s->internal->shutdown = 0; 283 if (SSL_is_dtls(s)) { 284 dtls1_clear_record_buffer(s); 285 dtls1_start_timer(s); 286 } 287 ret = ssl3_send_hello_request(s); 288 if (ret <= 0) 289 goto end; 290 if (SSL_is_dtls(s)) 291 S3I(s)->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A; 292 else 293 S3I(s)->hs.tls12.next_state = SSL3_ST_SW_HELLO_REQ_C; 294 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 295 s->internal->init_num = 0; 296 297 if (SSL_is_dtls(s)) { 298 if (!tls1_transcript_init(s)) { 299 ret = -1; 300 goto end; 301 } 302 } 303 break; 304 305 case SSL3_ST_SW_HELLO_REQ_C: 306 S3I(s)->hs.state = SSL_ST_OK; 307 break; 308 309 case SSL3_ST_SR_CLNT_HELLO_A: 310 case SSL3_ST_SR_CLNT_HELLO_B: 311 case SSL3_ST_SR_CLNT_HELLO_C: 312 s->internal->shutdown = 0; 313 if (SSL_is_dtls(s)) { 314 ret = ssl3_get_client_hello(s); 315 if (ret <= 0) 316 goto end; 317 dtls1_stop_timer(s); 318 319 if (ret == 1 && 320 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 321 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 322 else 323 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 324 325 s->internal->init_num = 0; 326 327 /* 328 * Reflect ClientHello sequence to remain 329 * stateless while listening. 330 */ 331 if (listen) { 332 tls12_record_layer_reflect_seq_num( 333 s->internal->rl); 334 } 335 336 /* If we're just listening, stop here */ 337 if (listen && S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 338 ret = 2; 339 D1I(s)->listen = 0; 340 /* 341 * Set expected sequence numbers to 342 * continue the handshake. 343 */ 344 D1I(s)->handshake_read_seq = 2; 345 D1I(s)->handshake_write_seq = 1; 346 D1I(s)->next_handshake_write_seq = 1; 347 goto end; 348 } 349 } else { 350 if (s->internal->rwstate != SSL_X509_LOOKUP) { 351 ret = ssl3_get_client_hello(s); 352 if (ret <= 0) 353 goto end; 354 } 355 356 s->internal->renegotiate = 2; 357 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 358 s->internal->init_num = 0; 359 } 360 break; 361 362 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 363 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 364 ret = ssl3_send_dtls_hello_verify_request(s); 365 if (ret <= 0) 366 goto end; 367 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 368 S3I(s)->hs.tls12.next_state = SSL3_ST_SR_CLNT_HELLO_A; 369 370 /* HelloVerifyRequest resets Finished MAC. */ 371 tls1_transcript_reset(s); 372 break; 373 374 case SSL3_ST_SW_SRVR_HELLO_A: 375 case SSL3_ST_SW_SRVR_HELLO_B: 376 if (SSL_is_dtls(s)) { 377 s->internal->renegotiate = 2; 378 dtls1_start_timer(s); 379 } 380 ret = ssl3_send_server_hello(s); 381 if (ret <= 0) 382 goto end; 383 if (s->internal->hit) { 384 if (s->internal->tlsext_ticket_expected) 385 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 386 else 387 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 388 } else { 389 S3I(s)->hs.state = SSL3_ST_SW_CERT_A; 390 } 391 s->internal->init_num = 0; 392 break; 393 394 case SSL3_ST_SW_CERT_A: 395 case SSL3_ST_SW_CERT_B: 396 /* Check if it is anon DH or anon ECDH. */ 397 if (!(S3I(s)->hs.cipher->algorithm_auth & 398 SSL_aNULL)) { 399 if (SSL_is_dtls(s)) 400 dtls1_start_timer(s); 401 ret = ssl3_send_server_certificate(s); 402 if (ret <= 0) 403 goto end; 404 if (s->internal->tlsext_status_expected) 405 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_A; 406 else 407 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 408 } else { 409 skip = 1; 410 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 411 } 412 s->internal->init_num = 0; 413 break; 414 415 case SSL3_ST_SW_KEY_EXCH_A: 416 case SSL3_ST_SW_KEY_EXCH_B: 417 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 418 419 /* 420 * Only send if using a DH key exchange. 421 * 422 * For ECC ciphersuites, we send a ServerKeyExchange 423 * message only if the cipher suite is ECDHE. In other 424 * cases, the server certificate contains the server's 425 * public key for key exchange. 426 */ 427 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 428 if (SSL_is_dtls(s)) 429 dtls1_start_timer(s); 430 ret = ssl3_send_server_key_exchange(s); 431 if (ret <= 0) 432 goto end; 433 } else 434 skip = 1; 435 436 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_A; 437 s->internal->init_num = 0; 438 break; 439 440 case SSL3_ST_SW_CERT_REQ_A: 441 case SSL3_ST_SW_CERT_REQ_B: 442 /* 443 * Determine whether or not we need to request a 444 * certificate. 445 * 446 * Do not request a certificate if: 447 * 448 * - We did not ask for it (SSL_VERIFY_PEER is unset). 449 * 450 * - SSL_VERIFY_CLIENT_ONCE is set and we are 451 * renegotiating. 452 * 453 * - We are using an anonymous ciphersuites 454 * (see section "Certificate request" in SSL 3 drafts 455 * and in RFC 2246) ... except when the application 456 * insists on verification (against the specs, but 457 * s3_clnt.c accepts this for SSL 3). 458 */ 459 if (!(s->verify_mode & SSL_VERIFY_PEER) || 460 ((s->session->peer != NULL) && 461 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 462 ((S3I(s)->hs.cipher->algorithm_auth & 463 SSL_aNULL) && !(s->verify_mode & 464 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) { 465 /* No cert request. */ 466 skip = 1; 467 S3I(s)->hs.tls12.cert_request = 0; 468 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; 469 470 if (!SSL_is_dtls(s)) 471 tls1_transcript_free(s); 472 } else { 473 S3I(s)->hs.tls12.cert_request = 1; 474 if (SSL_is_dtls(s)) 475 dtls1_start_timer(s); 476 ret = ssl3_send_certificate_request(s); 477 if (ret <= 0) 478 goto end; 479 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; 480 s->internal->init_num = 0; 481 } 482 break; 483 484 case SSL3_ST_SW_SRVR_DONE_A: 485 case SSL3_ST_SW_SRVR_DONE_B: 486 if (SSL_is_dtls(s)) 487 dtls1_start_timer(s); 488 ret = ssl3_send_server_done(s); 489 if (ret <= 0) 490 goto end; 491 S3I(s)->hs.tls12.next_state = SSL3_ST_SR_CERT_A; 492 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 493 s->internal->init_num = 0; 494 break; 495 496 case SSL3_ST_SW_FLUSH: 497 /* 498 * This code originally checked to see if 499 * any data was pending using BIO_CTRL_INFO 500 * and then flushed. This caused problems 501 * as documented in PR#1939. The proposed 502 * fix doesn't completely resolve this issue 503 * as buggy implementations of BIO_CTRL_PENDING 504 * still exist. So instead we just flush 505 * unconditionally. 506 */ 507 s->internal->rwstate = SSL_WRITING; 508 if (BIO_flush(s->wbio) <= 0) { 509 if (SSL_is_dtls(s)) { 510 /* If the write error was fatal, stop trying. */ 511 if (!BIO_should_retry(s->wbio)) { 512 s->internal->rwstate = SSL_NOTHING; 513 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 514 } 515 } 516 ret = -1; 517 goto end; 518 } 519 s->internal->rwstate = SSL_NOTHING; 520 S3I(s)->hs.state = S3I(s)->hs.tls12.next_state; 521 break; 522 523 case SSL3_ST_SR_CERT_A: 524 case SSL3_ST_SR_CERT_B: 525 if (S3I(s)->hs.tls12.cert_request) { 526 ret = ssl3_get_client_certificate(s); 527 if (ret <= 0) 528 goto end; 529 } 530 s->internal->init_num = 0; 531 S3I(s)->hs.state = SSL3_ST_SR_KEY_EXCH_A; 532 break; 533 534 case SSL3_ST_SR_KEY_EXCH_A: 535 case SSL3_ST_SR_KEY_EXCH_B: 536 ret = ssl3_get_client_key_exchange(s); 537 if (ret <= 0) 538 goto end; 539 540 if (SSL_is_dtls(s)) { 541 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 542 s->internal->init_num = 0; 543 } 544 545 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 546 if (ret == 2) { 547 /* 548 * For the ECDH ciphersuites when 549 * the client sends its ECDH pub key in 550 * a certificate, the CertificateVerify 551 * message is not sent. 552 * Also for GOST ciphersuites when 553 * the client uses its key from the certificate 554 * for key exchange. 555 */ 556 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; 557 s->internal->init_num = 0; 558 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) { 559 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 560 s->internal->init_num = 0; 561 if (!s->session->peer) 562 break; 563 /* 564 * Freeze the transcript for use during client 565 * certificate verification. 566 */ 567 tls1_transcript_freeze(s); 568 } else { 569 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 570 s->internal->init_num = 0; 571 572 tls1_transcript_free(s); 573 574 /* 575 * We need to get hashes here so if there is 576 * a client cert, it can be verified. 577 */ 578 if (!tls1_transcript_hash_value(s, 579 S3I(s)->hs.tls12.cert_verify, 580 sizeof(S3I(s)->hs.tls12.cert_verify), 581 NULL)) { 582 ret = -1; 583 goto end; 584 } 585 } 586 break; 587 588 case SSL3_ST_SR_CERT_VRFY_A: 589 case SSL3_ST_SR_CERT_VRFY_B: 590 if (SSL_is_dtls(s)) 591 D1I(s)->change_cipher_spec_ok = 1; 592 else 593 s->s3->flags |= SSL3_FLAGS_CCS_OK; 594 595 /* we should decide if we expected this one */ 596 ret = ssl3_get_cert_verify(s); 597 if (ret <= 0) 598 goto end; 599 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; 600 s->internal->init_num = 0; 601 break; 602 603 case SSL3_ST_SR_FINISHED_A: 604 case SSL3_ST_SR_FINISHED_B: 605 if (SSL_is_dtls(s)) 606 D1I(s)->change_cipher_spec_ok = 1; 607 else 608 s->s3->flags |= SSL3_FLAGS_CCS_OK; 609 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 610 SSL3_ST_SR_FINISHED_B); 611 if (ret <= 0) 612 goto end; 613 if (SSL_is_dtls(s)) 614 dtls1_stop_timer(s); 615 if (s->internal->hit) 616 S3I(s)->hs.state = SSL_ST_OK; 617 else if (s->internal->tlsext_ticket_expected) 618 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 619 else 620 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 621 s->internal->init_num = 0; 622 break; 623 624 case SSL3_ST_SW_SESSION_TICKET_A: 625 case SSL3_ST_SW_SESSION_TICKET_B: 626 ret = ssl3_send_newsession_ticket(s); 627 if (ret <= 0) 628 goto end; 629 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 630 s->internal->init_num = 0; 631 break; 632 633 case SSL3_ST_SW_CERT_STATUS_A: 634 case SSL3_ST_SW_CERT_STATUS_B: 635 ret = ssl3_send_cert_status(s); 636 if (ret <= 0) 637 goto end; 638 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 639 s->internal->init_num = 0; 640 break; 641 642 case SSL3_ST_SW_CHANGE_A: 643 case SSL3_ST_SW_CHANGE_B: 644 s->session->cipher = S3I(s)->hs.cipher; 645 if (!tls1_setup_key_block(s)) { 646 ret = -1; 647 goto end; 648 } 649 650 ret = ssl3_send_change_cipher_spec(s, 651 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B); 652 if (ret <= 0) 653 goto end; 654 S3I(s)->hs.state = SSL3_ST_SW_FINISHED_A; 655 s->internal->init_num = 0; 656 657 if (!tls1_change_cipher_state(s, 658 SSL3_CHANGE_CIPHER_SERVER_WRITE)) { 659 ret = -1; 660 goto end; 661 } 662 663 if (SSL_is_dtls(s)) 664 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 665 break; 666 667 case SSL3_ST_SW_FINISHED_A: 668 case SSL3_ST_SW_FINISHED_B: 669 ret = ssl3_send_finished(s, SSL3_ST_SW_FINISHED_A, 670 SSL3_ST_SW_FINISHED_B); 671 if (ret <= 0) 672 goto end; 673 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 674 if (s->internal->hit) { 675 S3I(s)->hs.tls12.next_state = SSL3_ST_SR_FINISHED_A; 676 tls1_transcript_free(s); 677 } else 678 S3I(s)->hs.tls12.next_state = SSL_ST_OK; 679 s->internal->init_num = 0; 680 break; 681 682 case SSL_ST_OK: 683 /* clean a few things up */ 684 tls1_cleanup_key_block(s); 685 686 if (S3I(s)->handshake_transcript != NULL) { 687 SSLerror(s, ERR_R_INTERNAL_ERROR); 688 ret = -1; 689 goto end; 690 } 691 692 if (!SSL_is_dtls(s)) 693 ssl3_release_init_buffer(s); 694 695 /* remove buffering on output */ 696 ssl_free_wbio_buffer(s); 697 698 s->internal->init_num = 0; 699 700 /* Skipped if we just sent a HelloRequest. */ 701 if (s->internal->renegotiate == 2) { 702 s->internal->renegotiate = 0; 703 s->internal->new_session = 0; 704 705 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 706 707 s->ctx->internal->stats.sess_accept_good++; 708 /* s->server=1; */ 709 s->internal->handshake_func = ssl3_accept; 710 711 if (cb != NULL) 712 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 713 } 714 715 ret = 1; 716 717 if (SSL_is_dtls(s)) { 718 /* Done handshaking, next message is client hello. */ 719 D1I(s)->handshake_read_seq = 0; 720 /* Next message is server hello. */ 721 D1I(s)->handshake_write_seq = 0; 722 D1I(s)->next_handshake_write_seq = 0; 723 } 724 goto end; 725 /* break; */ 726 727 default: 728 SSLerror(s, SSL_R_UNKNOWN_STATE); 729 ret = -1; 730 goto end; 731 /* break; */ 732 } 733 734 if (!S3I(s)->hs.tls12.reuse_message && !skip) { 735 if (s->internal->debug) { 736 if ((ret = BIO_flush(s->wbio)) <= 0) 737 goto end; 738 } 739 740 741 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 742 new_state = S3I(s)->hs.state; 743 S3I(s)->hs.state = state; 744 cb(s, SSL_CB_ACCEPT_LOOP, 1); 745 S3I(s)->hs.state = new_state; 746 } 747 } 748 skip = 0; 749 } 750 end: 751 /* BIO_flush(s->wbio); */ 752 s->internal->in_handshake--; 753 if (cb != NULL) 754 cb(s, SSL_CB_ACCEPT_EXIT, ret); 755 756 return (ret); 757 } 758 759 int 760 ssl3_send_hello_request(SSL *s) 761 { 762 CBB cbb, hello; 763 764 memset(&cbb, 0, sizeof(cbb)); 765 766 if (S3I(s)->hs.state == SSL3_ST_SW_HELLO_REQ_A) { 767 if (!ssl3_handshake_msg_start(s, &cbb, &hello, 768 SSL3_MT_HELLO_REQUEST)) 769 goto err; 770 if (!ssl3_handshake_msg_finish(s, &cbb)) 771 goto err; 772 773 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_B; 774 } 775 776 /* SSL3_ST_SW_HELLO_REQ_B */ 777 return (ssl3_handshake_write(s)); 778 779 err: 780 CBB_cleanup(&cbb); 781 782 return (-1); 783 } 784 785 int 786 ssl3_get_client_hello(SSL *s) 787 { 788 CBS cbs, client_random, session_id, cookie, cipher_suites; 789 CBS compression_methods; 790 uint16_t client_version; 791 uint8_t comp_method; 792 int comp_null; 793 int i, j, ok, al, ret = -1, cookie_valid = 0; 794 long n; 795 unsigned long id; 796 SSL_CIPHER *c; 797 STACK_OF(SSL_CIPHER) *ciphers = NULL; 798 unsigned long alg_k; 799 const SSL_METHOD *method; 800 uint16_t shared_version; 801 802 /* 803 * We do this so that we will respond with our native type. 804 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, 805 * This down switching should be handled by a different method. 806 * If we are SSLv3, we will respond with SSLv3, even if prompted with 807 * TLSv1. 808 */ 809 if (S3I(s)->hs.state == SSL3_ST_SR_CLNT_HELLO_A) { 810 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_B; 811 } 812 813 s->internal->first_packet = 1; 814 n = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, 815 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, 816 SSL3_RT_MAX_PLAIN_LENGTH, &ok); 817 if (!ok) 818 return ((int)n); 819 s->internal->first_packet = 0; 820 821 if (n < 0) 822 goto err; 823 824 CBS_init(&cbs, s->internal->init_msg, n); 825 826 /* Parse client hello up until the extensions (if any). */ 827 if (!CBS_get_u16(&cbs, &client_version)) 828 goto decode_err; 829 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE)) 830 goto decode_err; 831 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 832 goto decode_err; 833 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 834 al = SSL_AD_ILLEGAL_PARAMETER; 835 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 836 goto fatal_err; 837 } 838 if (SSL_is_dtls(s)) { 839 if (!CBS_get_u8_length_prefixed(&cbs, &cookie)) 840 goto decode_err; 841 } 842 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites)) 843 goto decode_err; 844 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods)) 845 goto decode_err; 846 847 /* 848 * Use version from inside client hello, not from record header. 849 * (may differ: see RFC 2246, Appendix E, second paragraph) 850 */ 851 if (!ssl_max_shared_version(s, client_version, &shared_version)) { 852 if ((s->client_version >> 8) == SSL3_VERSION_MAJOR && 853 !tls12_record_layer_write_protected(s->internal->rl)) { 854 /* 855 * Similar to ssl3_get_record, send alert using remote 856 * version number. 857 */ 858 s->version = s->client_version; 859 } 860 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER); 861 al = SSL_AD_PROTOCOL_VERSION; 862 goto fatal_err; 863 } 864 s->client_version = client_version; 865 s->version = shared_version; 866 867 S3I(s)->hs.negotiated_tls_version = ssl_tls_version(shared_version); 868 if (S3I(s)->hs.negotiated_tls_version == 0) { 869 SSLerror(s, ERR_R_INTERNAL_ERROR); 870 goto err; 871 } 872 873 if ((method = ssl_get_method(shared_version)) == NULL) { 874 SSLerror(s, ERR_R_INTERNAL_ERROR); 875 goto err; 876 } 877 s->method = method; 878 879 /* 880 * If we require cookies (DTLS) and this ClientHello does not contain 881 * one, just return since we do not want to allocate any memory yet. 882 * So check cookie length... 883 */ 884 if (SSL_is_dtls(s)) { 885 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 886 if (CBS_len(&cookie) == 0) 887 return (1); 888 } 889 } 890 891 if (!CBS_write_bytes(&client_random, s->s3->client_random, 892 sizeof(s->s3->client_random), NULL)) 893 goto err; 894 895 s->internal->hit = 0; 896 897 /* 898 * Versions before 0.9.7 always allow clients to resume sessions in 899 * renegotiation. 0.9.7 and later allow this by default, but optionally 900 * ignore resumption requests with flag 901 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag 902 * rather than a change to default behavior so that applications 903 * relying on this for security won't even compile against older 904 * library versions). 905 * 906 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() 907 * to request renegotiation but not a new session (s->internal->new_session 908 * remains unset): for servers, this essentially just means that the 909 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be 910 * ignored. 911 */ 912 if ((s->internal->new_session && (s->internal->options & 913 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { 914 if (!ssl_get_new_session(s, 1)) 915 goto err; 916 } else { 917 CBS ext_block; 918 919 CBS_dup(&cbs, &ext_block); 920 921 i = ssl_get_prev_session(s, &session_id, &ext_block, &al); 922 if (i == 1) { /* previous session */ 923 s->internal->hit = 1; 924 } else if (i == -1) 925 goto fatal_err; 926 else { 927 /* i == 0 */ 928 if (!ssl_get_new_session(s, 1)) 929 goto err; 930 } 931 } 932 933 if (SSL_is_dtls(s)) { 934 /* 935 * The ClientHello may contain a cookie even if the HelloVerify 936 * message has not been sent - make sure that it does not cause 937 * an overflow. 938 */ 939 if (CBS_len(&cookie) > sizeof(D1I(s)->rcvd_cookie)) { 940 al = SSL_AD_DECODE_ERROR; 941 SSLerror(s, SSL_R_COOKIE_MISMATCH); 942 goto fatal_err; 943 } 944 945 /* Verify the cookie if appropriate option is set. */ 946 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && 947 CBS_len(&cookie) > 0) { 948 size_t cookie_len; 949 950 /* XXX - rcvd_cookie seems to only be used here... */ 951 if (!CBS_write_bytes(&cookie, D1I(s)->rcvd_cookie, 952 sizeof(D1I(s)->rcvd_cookie), &cookie_len)) 953 goto err; 954 955 if (s->ctx->internal->app_verify_cookie_cb != NULL) { 956 if (s->ctx->internal->app_verify_cookie_cb(s, 957 D1I(s)->rcvd_cookie, cookie_len) == 0) { 958 al = SSL_AD_HANDSHAKE_FAILURE; 959 SSLerror(s, SSL_R_COOKIE_MISMATCH); 960 goto fatal_err; 961 } 962 /* else cookie verification succeeded */ 963 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */ 964 } else if (timingsafe_memcmp(D1I(s)->rcvd_cookie, 965 D1I(s)->cookie, D1I(s)->cookie_len) != 0) { 966 /* default verification */ 967 al = SSL_AD_HANDSHAKE_FAILURE; 968 SSLerror(s, SSL_R_COOKIE_MISMATCH); 969 goto fatal_err; 970 } 971 cookie_valid = 1; 972 } 973 } 974 975 /* XXX - This logic seems wrong... */ 976 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) { 977 /* we need a cipher if we are not resuming a session */ 978 al = SSL_AD_ILLEGAL_PARAMETER; 979 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED); 980 goto fatal_err; 981 } 982 983 if (CBS_len(&cipher_suites) > 0) { 984 if ((ciphers = ssl_bytes_to_cipher_list(s, 985 &cipher_suites)) == NULL) 986 goto err; 987 } 988 989 /* If it is a hit, check that the cipher is in the list */ 990 /* XXX - CBS_len(&cipher_suites) will always be zero here... */ 991 if (s->internal->hit && CBS_len(&cipher_suites) > 0) { 992 j = 0; 993 id = s->session->cipher->id; 994 995 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 996 c = sk_SSL_CIPHER_value(ciphers, i); 997 if (c->id == id) { 998 j = 1; 999 break; 1000 } 1001 } 1002 if (j == 0) { 1003 /* 1004 * We need to have the cipher in the cipher 1005 * list if we are asked to reuse it 1006 */ 1007 al = SSL_AD_ILLEGAL_PARAMETER; 1008 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING); 1009 goto fatal_err; 1010 } 1011 } 1012 1013 comp_null = 0; 1014 while (CBS_len(&compression_methods) > 0) { 1015 if (!CBS_get_u8(&compression_methods, &comp_method)) 1016 goto decode_err; 1017 if (comp_method == 0) 1018 comp_null = 1; 1019 } 1020 if (comp_null == 0) { 1021 al = SSL_AD_DECODE_ERROR; 1022 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED); 1023 goto fatal_err; 1024 } 1025 1026 if (!tlsext_server_parse(s, SSL_TLSEXT_MSG_CH, &cbs, &al)) { 1027 SSLerror(s, SSL_R_PARSE_TLSEXT); 1028 goto fatal_err; 1029 } 1030 1031 if (!S3I(s)->renegotiate_seen && s->internal->renegotiate) { 1032 al = SSL_AD_HANDSHAKE_FAILURE; 1033 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1034 goto fatal_err; 1035 } 1036 1037 if (ssl_check_clienthello_tlsext_early(s) <= 0) { 1038 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1039 goto err; 1040 } 1041 1042 /* 1043 * Check if we want to use external pre-shared secret for this 1044 * handshake for not reused session only. We need to generate 1045 * server_random before calling tls_session_secret_cb in order to allow 1046 * SessionTicket processing to use it in key derivation. 1047 */ 1048 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE); 1049 1050 if (S3I(s)->hs.our_max_tls_version >= TLS1_2_VERSION && 1051 S3I(s)->hs.negotiated_tls_version < S3I(s)->hs.our_max_tls_version) { 1052 /* 1053 * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3 1054 * we must set the last 8 bytes of the server random to magical 1055 * values to indicate we meant to downgrade. For TLS 1.2 it is 1056 * recommended that we do the same. 1057 */ 1058 size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12); 1059 uint8_t *magic = &s->s3->server_random[index]; 1060 if (S3I(s)->hs.negotiated_tls_version == TLS1_2_VERSION) { 1061 /* Indicate we chose to downgrade to 1.2. */ 1062 memcpy(magic, tls13_downgrade_12, 1063 sizeof(tls13_downgrade_12)); 1064 } else { 1065 /* Indicate we chose to downgrade to 1.1 or lower */ 1066 memcpy(magic, tls13_downgrade_11, 1067 sizeof(tls13_downgrade_11)); 1068 } 1069 } 1070 1071 if (!s->internal->hit && s->internal->tls_session_secret_cb) { 1072 SSL_CIPHER *pref_cipher = NULL; 1073 1074 s->session->master_key_length = sizeof(s->session->master_key); 1075 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 1076 &s->session->master_key_length, ciphers, &pref_cipher, 1077 s->internal->tls_session_secret_cb_arg)) { 1078 s->internal->hit = 1; 1079 s->session->ciphers = ciphers; 1080 s->session->verify_result = X509_V_OK; 1081 1082 ciphers = NULL; 1083 1084 /* check if some cipher was preferred by call back */ 1085 pref_cipher = pref_cipher ? pref_cipher : 1086 ssl3_choose_cipher(s, s->session->ciphers, 1087 SSL_get_ciphers(s)); 1088 if (pref_cipher == NULL) { 1089 al = SSL_AD_HANDSHAKE_FAILURE; 1090 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1091 goto fatal_err; 1092 } 1093 1094 s->session->cipher = pref_cipher; 1095 1096 sk_SSL_CIPHER_free(s->cipher_list); 1097 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); 1098 } 1099 } 1100 1101 /* 1102 * Given s->session->ciphers and SSL_get_ciphers, we must 1103 * pick a cipher 1104 */ 1105 1106 if (!s->internal->hit) { 1107 sk_SSL_CIPHER_free(s->session->ciphers); 1108 s->session->ciphers = ciphers; 1109 if (ciphers == NULL) { 1110 al = SSL_AD_ILLEGAL_PARAMETER; 1111 SSLerror(s, SSL_R_NO_CIPHERS_PASSED); 1112 goto fatal_err; 1113 } 1114 ciphers = NULL; 1115 c = ssl3_choose_cipher(s, s->session->ciphers, 1116 SSL_get_ciphers(s)); 1117 1118 if (c == NULL) { 1119 al = SSL_AD_HANDSHAKE_FAILURE; 1120 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1121 goto fatal_err; 1122 } 1123 S3I(s)->hs.cipher = c; 1124 } else { 1125 S3I(s)->hs.cipher = s->session->cipher; 1126 } 1127 1128 if (!tls1_transcript_hash_init(s)) 1129 goto err; 1130 1131 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 1132 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) || 1133 !(s->verify_mode & SSL_VERIFY_PEER)) 1134 tls1_transcript_free(s); 1135 1136 /* 1137 * We now have the following setup. 1138 * client_random 1139 * cipher_list - our prefered list of ciphers 1140 * ciphers - the clients prefered list of ciphers 1141 * compression - basically ignored right now 1142 * ssl version is set - sslv3 1143 * s->session - The ssl session has been setup. 1144 * s->internal->hit - session reuse flag 1145 * s->hs.cipher - the new cipher to use. 1146 */ 1147 1148 /* Handles TLS extensions that we couldn't check earlier */ 1149 if (ssl_check_clienthello_tlsext_late(s) <= 0) { 1150 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1151 goto err; 1152 } 1153 1154 ret = cookie_valid ? 2 : 1; 1155 1156 if (0) { 1157 decode_err: 1158 al = SSL_AD_DECODE_ERROR; 1159 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1160 fatal_err: 1161 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1162 } 1163 err: 1164 sk_SSL_CIPHER_free(ciphers); 1165 1166 return (ret); 1167 } 1168 1169 int 1170 ssl3_send_dtls_hello_verify_request(SSL *s) 1171 { 1172 CBB cbb, verify, cookie; 1173 1174 memset(&cbb, 0, sizeof(cbb)); 1175 1176 if (S3I(s)->hs.state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 1177 if (s->ctx->internal->app_gen_cookie_cb == NULL || 1178 s->ctx->internal->app_gen_cookie_cb(s, D1I(s)->cookie, 1179 &(D1I(s)->cookie_len)) == 0) { 1180 SSLerror(s, ERR_R_INTERNAL_ERROR); 1181 return 0; 1182 } 1183 1184 /* 1185 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should 1186 * always contain DTLSv1.0 regardless of the version that is 1187 * going to be negotiated. 1188 */ 1189 if (!ssl3_handshake_msg_start(s, &cbb, &verify, 1190 DTLS1_MT_HELLO_VERIFY_REQUEST)) 1191 goto err; 1192 if (!CBB_add_u16(&verify, DTLS1_VERSION)) 1193 goto err; 1194 if (!CBB_add_u8_length_prefixed(&verify, &cookie)) 1195 goto err; 1196 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, D1I(s)->cookie_len)) 1197 goto err; 1198 if (!ssl3_handshake_msg_finish(s, &cbb)) 1199 goto err; 1200 1201 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 1202 } 1203 1204 /* S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 1205 return (ssl3_handshake_write(s)); 1206 1207 err: 1208 CBB_cleanup(&cbb); 1209 1210 return (-1); 1211 } 1212 1213 int 1214 ssl3_send_server_hello(SSL *s) 1215 { 1216 CBB cbb, server_hello, session_id; 1217 size_t sl; 1218 1219 memset(&cbb, 0, sizeof(cbb)); 1220 1221 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 1222 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello, 1223 SSL3_MT_SERVER_HELLO)) 1224 goto err; 1225 1226 if (!CBB_add_u16(&server_hello, s->version)) 1227 goto err; 1228 if (!CBB_add_bytes(&server_hello, s->s3->server_random, 1229 sizeof(s->s3->server_random))) 1230 goto err; 1231 1232 /* 1233 * There are several cases for the session ID to send 1234 * back in the server hello: 1235 * 1236 * - For session reuse from the session cache, 1237 * we send back the old session ID. 1238 * - If stateless session reuse (using a session ticket) 1239 * is successful, we send back the client's "session ID" 1240 * (which doesn't actually identify the session). 1241 * - If it is a new session, we send back the new 1242 * session ID. 1243 * - However, if we want the new session to be single-use, 1244 * we send back a 0-length session ID. 1245 * 1246 * s->internal->hit is non-zero in either case of session reuse, 1247 * so the following won't overwrite an ID that we're supposed 1248 * to send back. 1249 */ 1250 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER) 1251 && !s->internal->hit) 1252 s->session->session_id_length = 0; 1253 1254 sl = s->session->session_id_length; 1255 if (sl > sizeof(s->session->session_id)) { 1256 SSLerror(s, ERR_R_INTERNAL_ERROR); 1257 goto err; 1258 } 1259 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) 1260 goto err; 1261 if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) 1262 goto err; 1263 1264 /* Cipher suite. */ 1265 if (!CBB_add_u16(&server_hello, 1266 ssl3_cipher_get_value(S3I(s)->hs.cipher))) 1267 goto err; 1268 1269 /* Compression method (null). */ 1270 if (!CBB_add_u8(&server_hello, 0)) 1271 goto err; 1272 1273 /* TLS extensions */ 1274 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) { 1275 SSLerror(s, ERR_R_INTERNAL_ERROR); 1276 goto err; 1277 } 1278 1279 if (!ssl3_handshake_msg_finish(s, &cbb)) 1280 goto err; 1281 } 1282 1283 /* SSL3_ST_SW_SRVR_HELLO_B */ 1284 return (ssl3_handshake_write(s)); 1285 1286 err: 1287 CBB_cleanup(&cbb); 1288 1289 return (-1); 1290 } 1291 1292 int 1293 ssl3_send_server_done(SSL *s) 1294 { 1295 CBB cbb, done; 1296 1297 memset(&cbb, 0, sizeof(cbb)); 1298 1299 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) { 1300 if (!ssl3_handshake_msg_start(s, &cbb, &done, 1301 SSL3_MT_SERVER_DONE)) 1302 goto err; 1303 if (!ssl3_handshake_msg_finish(s, &cbb)) 1304 goto err; 1305 1306 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B; 1307 } 1308 1309 /* SSL3_ST_SW_SRVR_DONE_B */ 1310 return (ssl3_handshake_write(s)); 1311 1312 err: 1313 CBB_cleanup(&cbb); 1314 1315 return (-1); 1316 } 1317 1318 static int 1319 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) 1320 { 1321 CBB dh_p, dh_g, dh_Ys; 1322 DH *dh = NULL, *dhp; 1323 unsigned char *data; 1324 int al; 1325 1326 if (s->cert->dh_tmp_auto != 0) { 1327 if ((dhp = ssl_get_auto_dh(s)) == NULL) { 1328 al = SSL_AD_INTERNAL_ERROR; 1329 SSLerror(s, ERR_R_INTERNAL_ERROR); 1330 goto fatal_err; 1331 } 1332 } else 1333 dhp = s->cert->dh_tmp; 1334 1335 if (dhp == NULL && s->cert->dh_tmp_cb != NULL) 1336 dhp = s->cert->dh_tmp_cb(s, 0, 1337 SSL_C_PKEYLENGTH(S3I(s)->hs.cipher)); 1338 1339 if (dhp == NULL) { 1340 al = SSL_AD_HANDSHAKE_FAILURE; 1341 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1342 goto fatal_err; 1343 } 1344 1345 if (S3I(s)->tmp.dh != NULL) { 1346 SSLerror(s, ERR_R_INTERNAL_ERROR); 1347 goto err; 1348 } 1349 1350 if (s->cert->dh_tmp_auto != 0) { 1351 dh = dhp; 1352 } else if ((dh = DHparams_dup(dhp)) == NULL) { 1353 SSLerror(s, ERR_R_DH_LIB); 1354 goto err; 1355 } 1356 S3I(s)->tmp.dh = dh; 1357 if (!DH_generate_key(dh)) { 1358 SSLerror(s, ERR_R_DH_LIB); 1359 goto err; 1360 } 1361 1362 /* 1363 * Serialize the DH parameters and public key. 1364 */ 1365 if (!CBB_add_u16_length_prefixed(cbb, &dh_p)) 1366 goto err; 1367 if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p))) 1368 goto err; 1369 BN_bn2bin(dh->p, data); 1370 1371 if (!CBB_add_u16_length_prefixed(cbb, &dh_g)) 1372 goto err; 1373 if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g))) 1374 goto err; 1375 BN_bn2bin(dh->g, data); 1376 1377 if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys)) 1378 goto err; 1379 if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key))) 1380 goto err; 1381 BN_bn2bin(dh->pub_key, data); 1382 1383 if (!CBB_flush(cbb)) 1384 goto err; 1385 1386 return (1); 1387 1388 fatal_err: 1389 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1390 err: 1391 return (-1); 1392 } 1393 1394 static int 1395 ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb) 1396 { 1397 uint16_t curve_id; 1398 EC_KEY *ecdh; 1399 CBB ecpoint; 1400 int al; 1401 1402 /* 1403 * Only named curves are supported in ECDH ephemeral key exchanges. 1404 * For supported named curves, curve_id is non-zero. 1405 */ 1406 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1407 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1408 goto err; 1409 } 1410 1411 if (S3I(s)->tmp.ecdh != NULL) { 1412 SSLerror(s, ERR_R_INTERNAL_ERROR); 1413 goto err; 1414 } 1415 1416 if ((S3I(s)->tmp.ecdh = EC_KEY_new()) == NULL) { 1417 al = SSL_AD_HANDSHAKE_FAILURE; 1418 SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY); 1419 goto fatal_err; 1420 } 1421 S3I(s)->tmp.ecdh_nid = nid; 1422 ecdh = S3I(s)->tmp.ecdh; 1423 1424 if (!ssl_kex_generate_ecdhe_ecp(ecdh, nid)) 1425 goto err; 1426 1427 /* 1428 * Encode the public key. 1429 * 1430 * Only named curves are supported in ECDH ephemeral key exchanges. 1431 * In this case the ServerKeyExchange message has: 1432 * [1 byte CurveType], [2 byte CurveName] 1433 * [1 byte length of encoded point], followed by 1434 * the actual encoded point itself. 1435 */ 1436 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1437 goto err; 1438 if (!CBB_add_u16(cbb, curve_id)) 1439 goto err; 1440 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1441 goto err; 1442 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 1443 goto err; 1444 if (!CBB_flush(cbb)) 1445 goto err; 1446 1447 return (1); 1448 1449 fatal_err: 1450 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1451 err: 1452 return (-1); 1453 } 1454 1455 static int 1456 ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb) 1457 { 1458 uint8_t *public_key = NULL, *private_key = NULL; 1459 uint16_t curve_id; 1460 CBB ecpoint; 1461 int ret = -1; 1462 1463 /* Generate an X25519 key pair. */ 1464 if (S3I(s)->tmp.x25519 != NULL) { 1465 SSLerror(s, ERR_R_INTERNAL_ERROR); 1466 goto err; 1467 } 1468 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 1469 goto err; 1470 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 1471 goto err; 1472 X25519_keypair(public_key, private_key); 1473 1474 /* Serialize public key. */ 1475 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1476 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1477 goto err; 1478 } 1479 1480 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1481 goto err; 1482 if (!CBB_add_u16(cbb, curve_id)) 1483 goto err; 1484 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1485 goto err; 1486 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 1487 goto err; 1488 if (!CBB_flush(cbb)) 1489 goto err; 1490 1491 S3I(s)->tmp.x25519 = private_key; 1492 private_key = NULL; 1493 ret = 1; 1494 1495 err: 1496 free(public_key); 1497 freezero(private_key, X25519_KEY_LENGTH); 1498 1499 return (ret); 1500 } 1501 1502 static int 1503 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) 1504 { 1505 int nid; 1506 1507 nid = tls1_get_shared_curve(s); 1508 1509 if (nid == NID_X25519) 1510 return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb); 1511 1512 return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb); 1513 } 1514 1515 int 1516 ssl3_send_server_key_exchange(SSL *s) 1517 { 1518 CBB cbb, cbb_params, cbb_signature, server_kex; 1519 const struct ssl_sigalg *sigalg = NULL; 1520 unsigned char *signature = NULL; 1521 size_t signature_len = 0; 1522 unsigned char *params = NULL; 1523 size_t params_len; 1524 const EVP_MD *md = NULL; 1525 unsigned long type; 1526 EVP_MD_CTX md_ctx; 1527 EVP_PKEY_CTX *pctx; 1528 EVP_PKEY *pkey; 1529 int al; 1530 1531 memset(&cbb, 0, sizeof(cbb)); 1532 memset(&cbb_params, 0, sizeof(cbb_params)); 1533 1534 EVP_MD_CTX_init(&md_ctx); 1535 1536 if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) { 1537 1538 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex, 1539 SSL3_MT_SERVER_KEY_EXCHANGE)) 1540 goto err; 1541 1542 if (!CBB_init(&cbb_params, 0)) 1543 goto err; 1544 1545 type = S3I(s)->hs.cipher->algorithm_mkey; 1546 if (type & SSL_kDHE) { 1547 if (ssl3_send_server_kex_dhe(s, &cbb_params) != 1) 1548 goto err; 1549 } else if (type & SSL_kECDHE) { 1550 if (ssl3_send_server_kex_ecdhe(s, &cbb_params) != 1) 1551 goto err; 1552 } else { 1553 al = SSL_AD_HANDSHAKE_FAILURE; 1554 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1555 goto fatal_err; 1556 } 1557 1558 if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len)) 1559 goto err; 1560 1561 if (!CBB_add_bytes(&server_kex, params, params_len)) 1562 goto err; 1563 1564 /* Add signature unless anonymous. */ 1565 if (!(S3I(s)->hs.cipher->algorithm_auth & SSL_aNULL)) { 1566 if ((pkey = ssl_get_sign_pkey(s, S3I(s)->hs.cipher, 1567 &md, &sigalg)) == NULL) { 1568 al = SSL_AD_DECODE_ERROR; 1569 goto fatal_err; 1570 } 1571 1572 /* Send signature algorithm. */ 1573 if (SSL_USE_SIGALGS(s)) { 1574 if (!CBB_add_u16(&server_kex, sigalg->value)) { 1575 al = SSL_AD_INTERNAL_ERROR; 1576 SSLerror(s, ERR_R_INTERNAL_ERROR); 1577 goto fatal_err; 1578 } 1579 } 1580 1581 if (!EVP_DigestSignInit(&md_ctx, &pctx, md, NULL, pkey)) { 1582 SSLerror(s, ERR_R_EVP_LIB); 1583 goto err; 1584 } 1585 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1586 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1587 RSA_PKCS1_PSS_PADDING) || 1588 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1589 SSLerror(s, ERR_R_EVP_LIB); 1590 goto err; 1591 } 1592 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->client_random, 1593 SSL3_RANDOM_SIZE)) { 1594 SSLerror(s, ERR_R_EVP_LIB); 1595 goto err; 1596 } 1597 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->server_random, 1598 SSL3_RANDOM_SIZE)) { 1599 SSLerror(s, ERR_R_EVP_LIB); 1600 goto err; 1601 } 1602 if (!EVP_DigestSignUpdate(&md_ctx, params, params_len)) { 1603 SSLerror(s, ERR_R_EVP_LIB); 1604 goto err; 1605 } 1606 if (!EVP_DigestSignFinal(&md_ctx, NULL, &signature_len) || 1607 !signature_len) { 1608 SSLerror(s, ERR_R_EVP_LIB); 1609 goto err; 1610 } 1611 if ((signature = calloc(1, signature_len)) == NULL) { 1612 SSLerror(s, ERR_R_MALLOC_FAILURE); 1613 goto err; 1614 } 1615 if (!EVP_DigestSignFinal(&md_ctx, signature, &signature_len)) { 1616 SSLerror(s, ERR_R_EVP_LIB); 1617 goto err; 1618 } 1619 1620 if (!CBB_add_u16_length_prefixed(&server_kex, 1621 &cbb_signature)) 1622 goto err; 1623 if (!CBB_add_bytes(&cbb_signature, signature, 1624 signature_len)) 1625 goto err; 1626 } 1627 1628 if (!ssl3_handshake_msg_finish(s, &cbb)) 1629 goto err; 1630 1631 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1632 } 1633 1634 EVP_MD_CTX_cleanup(&md_ctx); 1635 free(params); 1636 free(signature); 1637 1638 return (ssl3_handshake_write(s)); 1639 1640 fatal_err: 1641 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1642 err: 1643 CBB_cleanup(&cbb_params); 1644 CBB_cleanup(&cbb); 1645 EVP_MD_CTX_cleanup(&md_ctx); 1646 free(params); 1647 free(signature); 1648 1649 return (-1); 1650 } 1651 1652 int 1653 ssl3_send_certificate_request(SSL *s) 1654 { 1655 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1656 STACK_OF(X509_NAME) *sk = NULL; 1657 X509_NAME *name; 1658 int i; 1659 1660 /* 1661 * Certificate Request - RFC 5246 section 7.4.4. 1662 */ 1663 1664 memset(&cbb, 0, sizeof(cbb)); 1665 1666 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1667 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, 1668 SSL3_MT_CERTIFICATE_REQUEST)) 1669 goto err; 1670 1671 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1672 goto err; 1673 if (!ssl3_get_req_cert_types(s, &cert_types)) 1674 goto err; 1675 1676 if (SSL_USE_SIGALGS(s)) { 1677 if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs)) 1678 goto err; 1679 if (!ssl_sigalgs_build(&sigalgs, tls12_sigalgs, tls12_sigalgs_len)) 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 s->session->master_key_length = 1801 tls1_generate_master_secret(s, 1802 s->session->master_key, p, SSL_MAX_MASTER_KEY_LENGTH); 1803 1804 freezero(pms, pms_len); 1805 1806 return (1); 1807 1808 decode_err: 1809 al = SSL_AD_DECODE_ERROR; 1810 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1811 fatal_err: 1812 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1813 err: 1814 freezero(pms, pms_len); 1815 1816 return (-1); 1817 } 1818 1819 static int 1820 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) 1821 { 1822 int key_size = 0; 1823 int key_is_invalid, key_len, al; 1824 unsigned char *key = NULL; 1825 BIGNUM *bn = NULL; 1826 CBS dh_Yc; 1827 DH *dh; 1828 1829 if (!CBS_get_u16_length_prefixed(cbs, &dh_Yc)) 1830 goto decode_err; 1831 if (CBS_len(cbs) != 0) 1832 goto decode_err; 1833 1834 if (S3I(s)->tmp.dh == NULL) { 1835 al = SSL_AD_HANDSHAKE_FAILURE; 1836 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1837 goto fatal_err; 1838 } 1839 dh = S3I(s)->tmp.dh; 1840 1841 if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) { 1842 SSLerror(s, SSL_R_BN_LIB); 1843 goto err; 1844 } 1845 1846 if ((key_size = DH_size(dh)) <= 0) { 1847 SSLerror(s, ERR_R_DH_LIB); 1848 goto err; 1849 } 1850 if ((key = malloc(key_size)) == NULL) { 1851 SSLerror(s, ERR_R_MALLOC_FAILURE); 1852 goto err; 1853 } 1854 if (!DH_check_pub_key(dh, bn, &key_is_invalid)) { 1855 al = SSL_AD_INTERNAL_ERROR; 1856 SSLerror(s, ERR_R_DH_LIB); 1857 goto fatal_err; 1858 } 1859 if (key_is_invalid) { 1860 al = SSL_AD_ILLEGAL_PARAMETER; 1861 SSLerror(s, ERR_R_DH_LIB); 1862 goto fatal_err; 1863 } 1864 if ((key_len = DH_compute_key(key, bn, dh)) <= 0) { 1865 al = SSL_AD_INTERNAL_ERROR; 1866 SSLerror(s, ERR_R_DH_LIB); 1867 goto fatal_err; 1868 } 1869 1870 s->session->master_key_length = tls1_generate_master_secret(s, 1871 s->session->master_key, key, key_len); 1872 1873 DH_free(S3I(s)->tmp.dh); 1874 S3I(s)->tmp.dh = NULL; 1875 1876 freezero(key, key_size); 1877 BN_clear_free(bn); 1878 1879 return (1); 1880 1881 decode_err: 1882 al = SSL_AD_DECODE_ERROR; 1883 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1884 fatal_err: 1885 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1886 err: 1887 freezero(key, key_size); 1888 BN_clear_free(bn); 1889 1890 return (-1); 1891 } 1892 1893 static int 1894 ssl3_get_client_kex_ecdhe_ecp(SSL *s, CBS *cbs) 1895 { 1896 uint8_t *key = NULL; 1897 size_t key_len = 0; 1898 EC_KEY *ecdh_peer = NULL; 1899 EC_KEY *ecdh; 1900 CBS public; 1901 int ret = -1; 1902 1903 /* 1904 * Use the ephemeral values we saved when generating the 1905 * ServerKeyExchange message. 1906 */ 1907 if ((ecdh = S3I(s)->tmp.ecdh) == NULL) { 1908 SSLerror(s, ERR_R_INTERNAL_ERROR); 1909 goto err; 1910 } 1911 1912 /* 1913 * Get client's public key from encoded point in the ClientKeyExchange 1914 * message. 1915 */ 1916 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1917 goto err; 1918 if (CBS_len(cbs) != 0) 1919 goto err; 1920 1921 if ((ecdh_peer = EC_KEY_new()) == NULL) 1922 goto err; 1923 1924 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh_peer, S3I(s)->tmp.ecdh_nid, 1925 &public)) 1926 goto err; 1927 1928 /* Derive the shared secret and compute master secret. */ 1929 if (!ssl_kex_derive_ecdhe_ecp(ecdh, ecdh_peer, &key, &key_len)) 1930 goto err; 1931 s->session->master_key_length = tls1_generate_master_secret(s, 1932 s->session->master_key, key, key_len); 1933 1934 EC_KEY_free(S3I(s)->tmp.ecdh); 1935 S3I(s)->tmp.ecdh = NULL; 1936 S3I(s)->tmp.ecdh_nid = NID_undef; 1937 1938 ret = 1; 1939 1940 err: 1941 freezero(key, key_len); 1942 EC_KEY_free(ecdh_peer); 1943 1944 return (ret); 1945 } 1946 1947 static int 1948 ssl3_get_client_kex_ecdhe_ecx(SSL *s, CBS *cbs) 1949 { 1950 uint8_t *shared_key = NULL; 1951 CBS ecpoint; 1952 int ret = -1; 1953 1954 if (!CBS_get_u8_length_prefixed(cbs, &ecpoint)) 1955 goto err; 1956 if (CBS_len(cbs) != 0) 1957 goto err; 1958 if (CBS_len(&ecpoint) != X25519_KEY_LENGTH) 1959 goto err; 1960 1961 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 1962 goto err; 1963 if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint))) 1964 goto err; 1965 1966 freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH); 1967 S3I(s)->tmp.x25519 = NULL; 1968 1969 s->session->master_key_length = 1970 tls1_generate_master_secret( 1971 s, s->session->master_key, shared_key, X25519_KEY_LENGTH); 1972 1973 ret = 1; 1974 1975 err: 1976 freezero(shared_key, X25519_KEY_LENGTH); 1977 1978 return (ret); 1979 } 1980 1981 static int 1982 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) 1983 { 1984 if (S3I(s)->tmp.x25519 != NULL) 1985 return ssl3_get_client_kex_ecdhe_ecx(s, cbs); 1986 1987 return ssl3_get_client_kex_ecdhe_ecp(s, cbs); 1988 } 1989 1990 static int 1991 ssl3_get_client_kex_gost(SSL *s, CBS *cbs) 1992 { 1993 EVP_PKEY_CTX *pkey_ctx; 1994 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; 1995 unsigned char premaster_secret[32]; 1996 unsigned long alg_a; 1997 size_t outlen = 32; 1998 CBS gostblob; 1999 int al; 2000 int ret = 0; 2001 2002 /* Get our certificate private key*/ 2003 alg_a = S3I(s)->hs.cipher->algorithm_auth; 2004 if (alg_a & SSL_aGOST01) 2005 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 2006 2007 if ((pkey_ctx = EVP_PKEY_CTX_new(pk, NULL)) == NULL) 2008 goto err; 2009 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) 2010 goto gerr; 2011 2012 /* 2013 * If client certificate is present and is of the same type, 2014 * maybe use it for key exchange. 2015 * Don't mind errors from EVP_PKEY_derive_set_peer, because 2016 * it is completely valid to use a client certificate for 2017 * authorization only. 2018 */ 2019 if ((client_pub_pkey = X509_get_pubkey(s->session->peer)) != NULL) { 2020 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2021 client_pub_pkey) <= 0) 2022 ERR_clear_error(); 2023 } 2024 2025 /* Decrypt session key */ 2026 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) 2027 goto decode_err; 2028 if (CBS_len(cbs) != 0) 2029 goto decode_err; 2030 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 2031 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { 2032 SSLerror(s, SSL_R_DECRYPTION_FAILED); 2033 goto gerr; 2034 } 2035 2036 /* Generate master secret */ 2037 s->session->master_key_length = 2038 tls1_generate_master_secret( 2039 s, s->session->master_key, premaster_secret, 32); 2040 2041 /* Check if pubkey from client certificate was used */ 2042 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, 2043 EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) 2044 ret = 2; 2045 else 2046 ret = 1; 2047 gerr: 2048 EVP_PKEY_free(client_pub_pkey); 2049 EVP_PKEY_CTX_free(pkey_ctx); 2050 if (ret) 2051 return (ret); 2052 else 2053 goto err; 2054 2055 decode_err: 2056 al = SSL_AD_DECODE_ERROR; 2057 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2058 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2059 err: 2060 return (-1); 2061 } 2062 2063 int 2064 ssl3_get_client_key_exchange(SSL *s) 2065 { 2066 unsigned long alg_k; 2067 int al, ok; 2068 CBS cbs; 2069 long n; 2070 2071 /* 2048 maxlen is a guess. How long a key does that permit? */ 2072 n = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 2073 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok); 2074 if (!ok) 2075 return ((int)n); 2076 2077 if (n < 0) 2078 goto err; 2079 2080 CBS_init(&cbs, s->internal->init_msg, n); 2081 2082 alg_k = S3I(s)->hs.cipher->algorithm_mkey; 2083 2084 if (alg_k & SSL_kRSA) { 2085 if (ssl3_get_client_kex_rsa(s, &cbs) != 1) 2086 goto err; 2087 } else if (alg_k & SSL_kDHE) { 2088 if (ssl3_get_client_kex_dhe(s, &cbs) != 1) 2089 goto err; 2090 } else if (alg_k & SSL_kECDHE) { 2091 if (ssl3_get_client_kex_ecdhe(s, &cbs) != 1) 2092 goto err; 2093 } else if (alg_k & SSL_kGOST) { 2094 if (ssl3_get_client_kex_gost(s, &cbs) != 1) 2095 goto err; 2096 } else { 2097 al = SSL_AD_HANDSHAKE_FAILURE; 2098 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 2099 goto fatal_err; 2100 } 2101 2102 if (CBS_len(&cbs) != 0) { 2103 al = SSL_AD_DECODE_ERROR; 2104 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2105 goto fatal_err; 2106 } 2107 2108 return (1); 2109 2110 fatal_err: 2111 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2112 err: 2113 return (-1); 2114 } 2115 2116 int 2117 ssl3_get_cert_verify(SSL *s) 2118 { 2119 CBS cbs, signature; 2120 const struct ssl_sigalg *sigalg = NULL; 2121 const EVP_MD *md = NULL; 2122 EVP_PKEY *pkey = NULL; 2123 X509 *peer = NULL; 2124 EVP_MD_CTX mctx; 2125 int al, ok, verify; 2126 const unsigned char *hdata; 2127 size_t hdatalen; 2128 int type = 0; 2129 int ret = 0; 2130 long n; 2131 2132 EVP_MD_CTX_init(&mctx); 2133 2134 n = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 2135 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok); 2136 if (!ok) 2137 return ((int)n); 2138 2139 if (n < 0) 2140 goto err; 2141 2142 CBS_init(&cbs, s->internal->init_msg, n); 2143 2144 if (s->session->peer != NULL) { 2145 peer = s->session->peer; 2146 pkey = X509_get_pubkey(peer); 2147 type = X509_certificate_type(peer, pkey); 2148 } 2149 2150 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 2151 S3I(s)->hs.tls12.reuse_message = 1; 2152 if (peer != NULL) { 2153 al = SSL_AD_UNEXPECTED_MESSAGE; 2154 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 2155 goto fatal_err; 2156 } 2157 ret = 1; 2158 goto end; 2159 } 2160 2161 if (peer == NULL) { 2162 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 2163 al = SSL_AD_UNEXPECTED_MESSAGE; 2164 goto fatal_err; 2165 } 2166 2167 if (!(type & EVP_PKT_SIGN)) { 2168 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 2169 al = SSL_AD_ILLEGAL_PARAMETER; 2170 goto fatal_err; 2171 } 2172 2173 if (S3I(s)->change_cipher_spec) { 2174 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 2175 al = SSL_AD_UNEXPECTED_MESSAGE; 2176 goto fatal_err; 2177 } 2178 2179 if (!SSL_USE_SIGALGS(s)) { 2180 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2181 goto err; 2182 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2183 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2184 al = SSL_AD_DECODE_ERROR; 2185 goto fatal_err; 2186 } 2187 if (CBS_len(&cbs) != 0) { 2188 al = SSL_AD_DECODE_ERROR; 2189 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2190 goto fatal_err; 2191 } 2192 } 2193 2194 if (SSL_USE_SIGALGS(s)) { 2195 EVP_PKEY_CTX *pctx; 2196 uint16_t sigalg_value; 2197 2198 if (!CBS_get_u16(&cbs, &sigalg_value)) 2199 goto decode_err; 2200 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 2201 tls12_sigalgs_len)) == NULL || 2202 (md = sigalg->md()) == NULL) { 2203 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2204 al = SSL_AD_DECODE_ERROR; 2205 goto fatal_err; 2206 } 2207 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 2208 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 2209 al = SSL_AD_DECODE_ERROR; 2210 goto fatal_err; 2211 } 2212 2213 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2214 goto err; 2215 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2216 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2217 al = SSL_AD_DECODE_ERROR; 2218 goto fatal_err; 2219 } 2220 if (CBS_len(&cbs) != 0) { 2221 al = SSL_AD_DECODE_ERROR; 2222 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2223 goto fatal_err; 2224 } 2225 2226 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2227 SSLerror(s, ERR_R_INTERNAL_ERROR); 2228 al = SSL_AD_INTERNAL_ERROR; 2229 goto fatal_err; 2230 } 2231 if (!EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, pkey)) { 2232 SSLerror(s, ERR_R_EVP_LIB); 2233 al = SSL_AD_INTERNAL_ERROR; 2234 goto fatal_err; 2235 } 2236 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2237 (!EVP_PKEY_CTX_set_rsa_padding 2238 (pctx, RSA_PKCS1_PSS_PADDING) || 2239 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2240 al = SSL_AD_INTERNAL_ERROR; 2241 goto fatal_err; 2242 } 2243 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2244 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2245 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, 2246 NULL) <= 0) { 2247 al = SSL_AD_INTERNAL_ERROR; 2248 goto fatal_err; 2249 } 2250 if (!EVP_DigestVerifyUpdate(&mctx, hdata, hdatalen)) { 2251 SSLerror(s, ERR_R_EVP_LIB); 2252 al = SSL_AD_INTERNAL_ERROR; 2253 goto fatal_err; 2254 } 2255 if (EVP_DigestVerifyFinal(&mctx, CBS_data(&signature), 2256 CBS_len(&signature)) <= 0) { 2257 al = SSL_AD_DECRYPT_ERROR; 2258 SSLerror(s, SSL_R_BAD_SIGNATURE); 2259 goto fatal_err; 2260 } 2261 } else if (pkey->type == EVP_PKEY_RSA) { 2262 verify = RSA_verify(NID_md5_sha1, S3I(s)->hs.tls12.cert_verify, 2263 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), 2264 CBS_len(&signature), pkey->pkey.rsa); 2265 if (verify < 0) { 2266 al = SSL_AD_DECRYPT_ERROR; 2267 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2268 goto fatal_err; 2269 } 2270 if (verify == 0) { 2271 al = SSL_AD_DECRYPT_ERROR; 2272 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2273 goto fatal_err; 2274 } 2275 } else if (pkey->type == EVP_PKEY_EC) { 2276 verify = ECDSA_verify(pkey->save_type, 2277 &(S3I(s)->hs.tls12.cert_verify[MD5_DIGEST_LENGTH]), 2278 SHA_DIGEST_LENGTH, CBS_data(&signature), 2279 CBS_len(&signature), pkey->pkey.ec); 2280 if (verify <= 0) { 2281 al = SSL_AD_DECRYPT_ERROR; 2282 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2283 goto fatal_err; 2284 } 2285 #ifndef OPENSSL_NO_GOST 2286 } else if (pkey->type == NID_id_GostR3410_94 || 2287 pkey->type == NID_id_GostR3410_2001) { 2288 unsigned char sigbuf[128]; 2289 unsigned int siglen = sizeof(sigbuf); 2290 EVP_PKEY_CTX *pctx; 2291 int nid; 2292 2293 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2294 SSLerror(s, ERR_R_INTERNAL_ERROR); 2295 al = SSL_AD_INTERNAL_ERROR; 2296 goto fatal_err; 2297 } 2298 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2299 !(md = EVP_get_digestbynid(nid))) { 2300 SSLerror(s, ERR_R_EVP_LIB); 2301 al = SSL_AD_INTERNAL_ERROR; 2302 goto fatal_err; 2303 } 2304 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 2305 SSLerror(s, ERR_R_EVP_LIB); 2306 al = SSL_AD_INTERNAL_ERROR; 2307 goto fatal_err; 2308 } 2309 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2310 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2311 !EVP_DigestFinal(&mctx, sigbuf, &siglen) || 2312 (EVP_PKEY_verify_init(pctx) <= 0) || 2313 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2314 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2315 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2316 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { 2317 SSLerror(s, ERR_R_EVP_LIB); 2318 al = SSL_AD_INTERNAL_ERROR; 2319 EVP_PKEY_CTX_free(pctx); 2320 goto fatal_err; 2321 } 2322 if (EVP_PKEY_verify(pctx, CBS_data(&signature), 2323 CBS_len(&signature), sigbuf, siglen) <= 0) { 2324 al = SSL_AD_DECRYPT_ERROR; 2325 SSLerror(s, SSL_R_BAD_SIGNATURE); 2326 EVP_PKEY_CTX_free(pctx); 2327 goto fatal_err; 2328 } 2329 2330 EVP_PKEY_CTX_free(pctx); 2331 #endif 2332 } else { 2333 SSLerror(s, ERR_R_INTERNAL_ERROR); 2334 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2335 goto fatal_err; 2336 } 2337 2338 ret = 1; 2339 if (0) { 2340 decode_err: 2341 al = SSL_AD_DECODE_ERROR; 2342 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2343 fatal_err: 2344 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2345 } 2346 end: 2347 tls1_transcript_free(s); 2348 err: 2349 EVP_MD_CTX_cleanup(&mctx); 2350 EVP_PKEY_free(pkey); 2351 return (ret); 2352 } 2353 2354 int 2355 ssl3_get_client_certificate(SSL *s) 2356 { 2357 CBS cbs, client_certs; 2358 int i, ok, al, ret = -1; 2359 X509 *x = NULL; 2360 long n; 2361 const unsigned char *q; 2362 STACK_OF(X509) *sk = NULL; 2363 2364 n = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2365 -1, s->internal->max_cert_list, &ok); 2366 if (!ok) 2367 return ((int)n); 2368 2369 if (S3I(s)->hs.tls12.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2370 if ((s->verify_mode & SSL_VERIFY_PEER) && 2371 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2372 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2373 al = SSL_AD_HANDSHAKE_FAILURE; 2374 goto fatal_err; 2375 } 2376 /* 2377 * If tls asked for a client cert, 2378 * the client must return a 0 list. 2379 */ 2380 if (S3I(s)->hs.tls12.cert_request) { 2381 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 2382 ); 2383 al = SSL_AD_UNEXPECTED_MESSAGE; 2384 goto fatal_err; 2385 } 2386 S3I(s)->hs.tls12.reuse_message = 1; 2387 return (1); 2388 } 2389 2390 if (S3I(s)->hs.tls12.message_type != SSL3_MT_CERTIFICATE) { 2391 al = SSL_AD_UNEXPECTED_MESSAGE; 2392 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2393 goto fatal_err; 2394 } 2395 2396 if (n < 0) 2397 goto decode_err; 2398 2399 CBS_init(&cbs, s->internal->init_msg, n); 2400 2401 if ((sk = sk_X509_new_null()) == NULL) { 2402 SSLerror(s, ERR_R_MALLOC_FAILURE); 2403 goto err; 2404 } 2405 2406 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) || 2407 CBS_len(&cbs) != 0) 2408 goto decode_err; 2409 2410 while (CBS_len(&client_certs) > 0) { 2411 CBS cert; 2412 2413 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) { 2414 al = SSL_AD_DECODE_ERROR; 2415 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2416 goto fatal_err; 2417 } 2418 2419 q = CBS_data(&cert); 2420 x = d2i_X509(NULL, &q, CBS_len(&cert)); 2421 if (x == NULL) { 2422 SSLerror(s, ERR_R_ASN1_LIB); 2423 goto err; 2424 } 2425 if (q != CBS_data(&cert) + CBS_len(&cert)) { 2426 al = SSL_AD_DECODE_ERROR; 2427 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2428 goto fatal_err; 2429 } 2430 if (!sk_X509_push(sk, x)) { 2431 SSLerror(s, ERR_R_MALLOC_FAILURE); 2432 goto err; 2433 } 2434 x = NULL; 2435 } 2436 2437 if (sk_X509_num(sk) <= 0) { 2438 /* 2439 * TLS does not mind 0 certs returned. 2440 * Fail for TLS only if we required a certificate. 2441 */ 2442 if ((s->verify_mode & SSL_VERIFY_PEER) && 2443 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2444 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2445 al = SSL_AD_HANDSHAKE_FAILURE; 2446 goto fatal_err; 2447 } 2448 /* No client certificate so free transcript. */ 2449 tls1_transcript_free(s); 2450 } else { 2451 i = ssl_verify_cert_chain(s, sk); 2452 if (i <= 0) { 2453 al = ssl_verify_alarm_type(s->verify_result); 2454 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2455 goto fatal_err; 2456 } 2457 } 2458 2459 X509_free(s->session->peer); 2460 s->session->peer = sk_X509_shift(sk); 2461 s->session->verify_result = s->verify_result; 2462 2463 /* 2464 * With the current implementation, sess_cert will always be NULL 2465 * when we arrive here 2466 */ 2467 if (SSI(s)->sess_cert == NULL) { 2468 SSI(s)->sess_cert = ssl_sess_cert_new(); 2469 if (SSI(s)->sess_cert == NULL) { 2470 SSLerror(s, ERR_R_MALLOC_FAILURE); 2471 goto err; 2472 } 2473 } 2474 sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free); 2475 SSI(s)->sess_cert->cert_chain = sk; 2476 2477 /* 2478 * Inconsistency alert: cert_chain does *not* include the 2479 * peer's own certificate, while we do include it in s3_clnt.c 2480 */ 2481 2482 sk = NULL; 2483 2484 ret = 1; 2485 if (0) { 2486 decode_err: 2487 al = SSL_AD_DECODE_ERROR; 2488 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2489 fatal_err: 2490 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2491 } 2492 err: 2493 X509_free(x); 2494 sk_X509_pop_free(sk, X509_free); 2495 2496 return (ret); 2497 } 2498 2499 int 2500 ssl3_send_server_certificate(SSL *s) 2501 { 2502 CBB cbb, server_cert; 2503 CERT_PKEY *cpk; 2504 2505 /* 2506 * Server Certificate - RFC 5246, section 7.4.2. 2507 */ 2508 2509 memset(&cbb, 0, sizeof(cbb)); 2510 2511 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) { 2512 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { 2513 SSLerror(s, ERR_R_INTERNAL_ERROR); 2514 return (0); 2515 } 2516 2517 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, 2518 SSL3_MT_CERTIFICATE)) 2519 goto err; 2520 if (!ssl3_output_cert_chain(s, &server_cert, cpk)) 2521 goto err; 2522 if (!ssl3_handshake_msg_finish(s, &cbb)) 2523 goto err; 2524 2525 S3I(s)->hs.state = SSL3_ST_SW_CERT_B; 2526 } 2527 2528 /* SSL3_ST_SW_CERT_B */ 2529 return (ssl3_handshake_write(s)); 2530 2531 err: 2532 CBB_cleanup(&cbb); 2533 2534 return (0); 2535 } 2536 2537 /* send a new session ticket (not necessarily for a new session) */ 2538 int 2539 ssl3_send_newsession_ticket(SSL *s) 2540 { 2541 CBB cbb, session_ticket, ticket; 2542 SSL_CTX *tctx = s->initial_ctx; 2543 size_t enc_session_len, enc_session_max_len, hmac_len; 2544 size_t session_len = 0; 2545 unsigned char *enc_session = NULL, *session = NULL; 2546 unsigned char iv[EVP_MAX_IV_LENGTH]; 2547 unsigned char key_name[16]; 2548 unsigned char *hmac; 2549 unsigned int hlen; 2550 EVP_CIPHER_CTX ctx; 2551 HMAC_CTX hctx; 2552 int len; 2553 2554 /* 2555 * New Session Ticket - RFC 5077, section 3.3. 2556 */ 2557 2558 EVP_CIPHER_CTX_init(&ctx); 2559 HMAC_CTX_init(&hctx); 2560 2561 memset(&cbb, 0, sizeof(cbb)); 2562 2563 if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2564 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, 2565 SSL3_MT_NEWSESSION_TICKET)) 2566 goto err; 2567 2568 if (!SSL_SESSION_ticket(s->session, &session, &session_len)) 2569 goto err; 2570 if (session_len > 0xffff) 2571 goto err; 2572 2573 /* 2574 * Initialize HMAC and cipher contexts. If callback is present 2575 * it does all the work, otherwise use generated values from 2576 * parent context. 2577 */ 2578 if (tctx->internal->tlsext_ticket_key_cb != NULL) { 2579 if (tctx->internal->tlsext_ticket_key_cb(s, 2580 key_name, iv, &ctx, &hctx, 1) < 0) { 2581 EVP_CIPHER_CTX_cleanup(&ctx); 2582 goto err; 2583 } 2584 } else { 2585 arc4random_buf(iv, 16); 2586 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 2587 tctx->internal->tlsext_tick_aes_key, iv); 2588 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key, 2589 16, EVP_sha256(), NULL); 2590 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); 2591 } 2592 2593 /* Encrypt the session state. */ 2594 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; 2595 if ((enc_session = calloc(1, enc_session_max_len)) == NULL) 2596 goto err; 2597 enc_session_len = 0; 2598 if (!EVP_EncryptUpdate(&ctx, enc_session, &len, session, 2599 session_len)) 2600 goto err; 2601 enc_session_len += len; 2602 if (!EVP_EncryptFinal_ex(&ctx, enc_session + enc_session_len, 2603 &len)) 2604 goto err; 2605 enc_session_len += len; 2606 2607 if (enc_session_len > enc_session_max_len) 2608 goto err; 2609 2610 /* Generate the HMAC. */ 2611 if (!HMAC_Update(&hctx, key_name, sizeof(key_name))) 2612 goto err; 2613 if (!HMAC_Update(&hctx, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2614 goto err; 2615 if (!HMAC_Update(&hctx, enc_session, enc_session_len)) 2616 goto err; 2617 2618 if ((hmac_len = HMAC_size(&hctx)) <= 0) 2619 goto err; 2620 2621 /* 2622 * Ticket lifetime hint (advisory only): 2623 * We leave this unspecified for resumed session 2624 * (for simplicity), and guess that tickets for new 2625 * sessions will live as long as their sessions. 2626 */ 2627 if (!CBB_add_u32(&session_ticket, 2628 s->internal->hit ? 0 : s->session->timeout)) 2629 goto err; 2630 2631 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) 2632 goto err; 2633 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) 2634 goto err; 2635 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2636 goto err; 2637 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) 2638 goto err; 2639 if (!CBB_add_space(&ticket, &hmac, hmac_len)) 2640 goto err; 2641 2642 if (!HMAC_Final(&hctx, hmac, &hlen)) 2643 goto err; 2644 if (hlen != hmac_len) 2645 goto err; 2646 2647 if (!ssl3_handshake_msg_finish(s, &cbb)) 2648 goto err; 2649 2650 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2651 } 2652 2653 EVP_CIPHER_CTX_cleanup(&ctx); 2654 HMAC_CTX_cleanup(&hctx); 2655 freezero(session, session_len); 2656 free(enc_session); 2657 2658 /* SSL3_ST_SW_SESSION_TICKET_B */ 2659 return (ssl3_handshake_write(s)); 2660 2661 err: 2662 CBB_cleanup(&cbb); 2663 EVP_CIPHER_CTX_cleanup(&ctx); 2664 HMAC_CTX_cleanup(&hctx); 2665 freezero(session, session_len); 2666 free(enc_session); 2667 2668 return (-1); 2669 } 2670 2671 int 2672 ssl3_send_cert_status(SSL *s) 2673 { 2674 CBB cbb, certstatus, ocspresp; 2675 2676 memset(&cbb, 0, sizeof(cbb)); 2677 2678 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2679 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, 2680 SSL3_MT_CERTIFICATE_STATUS)) 2681 goto err; 2682 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2683 goto err; 2684 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2685 goto err; 2686 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, 2687 s->internal->tlsext_ocsp_resp_len)) 2688 goto err; 2689 if (!ssl3_handshake_msg_finish(s, &cbb)) 2690 goto err; 2691 2692 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2693 } 2694 2695 /* SSL3_ST_SW_CERT_STATUS_B */ 2696 return (ssl3_handshake_write(s)); 2697 2698 err: 2699 CBB_cleanup(&cbb); 2700 2701 return (-1); 2702 } 2703