1 /* $OpenBSD: ssl_srvr.c,v 1.95 2021/02/20 14:16:56 tb Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <stdio.h> 152 153 #include "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 s->internal->type = SSL_ST_ACCEPT; 223 224 if (!ssl3_setup_init_buffer(s)) { 225 ret = -1; 226 goto end; 227 } 228 if (!ssl3_setup_buffers(s)) { 229 ret = -1; 230 goto end; 231 } 232 233 s->internal->init_num = 0; 234 235 if (S3I(s)->hs.state != SSL_ST_RENEGOTIATE) { 236 /* 237 * Ok, we now need to push on a buffering BIO 238 * so that the output is sent in a way that 239 * TCP likes :-) 240 */ 241 if (!ssl_init_wbio_buffer(s, 1)) { 242 ret = -1; 243 goto end; 244 } 245 246 if (!tls1_transcript_init(s)) { 247 ret = -1; 248 goto end; 249 } 250 251 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_A; 252 s->ctx->internal->stats.sess_accept++; 253 } else if (!SSL_is_dtls(s) && !S3I(s)->send_connection_binding) { 254 /* 255 * Server attempting to renegotiate with 256 * client that doesn't support secure 257 * renegotiation. 258 */ 259 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 260 ssl3_send_alert(s, SSL3_AL_FATAL, 261 SSL_AD_HANDSHAKE_FAILURE); 262 ret = -1; 263 goto end; 264 } else { 265 /* 266 * S3I(s)->hs.state == SSL_ST_RENEGOTIATE, 267 * we will just send a HelloRequest. 268 */ 269 s->ctx->internal->stats.sess_accept_renegotiate++; 270 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_A; 271 } 272 break; 273 274 case SSL3_ST_SW_HELLO_REQ_A: 275 case SSL3_ST_SW_HELLO_REQ_B: 276 s->internal->shutdown = 0; 277 if (SSL_is_dtls(s)) { 278 dtls1_clear_record_buffer(s); 279 dtls1_start_timer(s); 280 } 281 ret = ssl3_send_hello_request(s); 282 if (ret <= 0) 283 goto end; 284 if (SSL_is_dtls(s)) 285 S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A; 286 else 287 S3I(s)->hs.next_state = SSL3_ST_SW_HELLO_REQ_C; 288 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 289 s->internal->init_num = 0; 290 291 if (!tls1_transcript_init(s)) { 292 ret = -1; 293 goto end; 294 } 295 break; 296 297 case SSL3_ST_SW_HELLO_REQ_C: 298 S3I(s)->hs.state = SSL_ST_OK; 299 break; 300 301 case SSL3_ST_SR_CLNT_HELLO_A: 302 case SSL3_ST_SR_CLNT_HELLO_B: 303 case SSL3_ST_SR_CLNT_HELLO_C: 304 s->internal->shutdown = 0; 305 if (SSL_is_dtls(s)) { 306 ret = ssl3_get_client_hello(s); 307 if (ret <= 0) 308 goto end; 309 dtls1_stop_timer(s); 310 311 if (ret == 1 && 312 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 313 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 314 else 315 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 316 317 s->internal->init_num = 0; 318 319 /* 320 * Reflect ClientHello sequence to remain 321 * stateless while listening. 322 */ 323 if (listen) { 324 tls12_record_layer_reflect_seq_num( 325 s->internal->rl); 326 } 327 328 /* If we're just listening, stop here */ 329 if (listen && S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 330 ret = 2; 331 D1I(s)->listen = 0; 332 /* 333 * Set expected sequence numbers to 334 * continue the handshake. 335 */ 336 D1I(s)->handshake_read_seq = 2; 337 D1I(s)->handshake_write_seq = 1; 338 D1I(s)->next_handshake_write_seq = 1; 339 goto end; 340 } 341 } else { 342 if (s->internal->rwstate != SSL_X509_LOOKUP) { 343 ret = ssl3_get_client_hello(s); 344 if (ret <= 0) 345 goto end; 346 } 347 348 s->internal->renegotiate = 2; 349 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 350 s->internal->init_num = 0; 351 } 352 break; 353 354 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 355 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 356 ret = ssl3_send_dtls_hello_verify_request(s); 357 if (ret <= 0) 358 goto end; 359 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 360 S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A; 361 362 /* HelloVerifyRequest resets Finished MAC. */ 363 tls1_transcript_reset(s); 364 break; 365 366 case SSL3_ST_SW_SRVR_HELLO_A: 367 case SSL3_ST_SW_SRVR_HELLO_B: 368 if (SSL_is_dtls(s)) { 369 s->internal->renegotiate = 2; 370 dtls1_start_timer(s); 371 } 372 ret = ssl3_send_server_hello(s); 373 if (ret <= 0) 374 goto end; 375 if (s->internal->hit) { 376 if (s->internal->tlsext_ticket_expected) 377 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 378 else 379 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 380 } else { 381 S3I(s)->hs.state = SSL3_ST_SW_CERT_A; 382 } 383 s->internal->init_num = 0; 384 break; 385 386 case SSL3_ST_SW_CERT_A: 387 case SSL3_ST_SW_CERT_B: 388 /* Check if it is anon DH or anon ECDH. */ 389 if (!(S3I(s)->hs.new_cipher->algorithm_auth & 390 SSL_aNULL)) { 391 if (SSL_is_dtls(s)) 392 dtls1_start_timer(s); 393 ret = ssl3_send_server_certificate(s); 394 if (ret <= 0) 395 goto end; 396 if (s->internal->tlsext_status_expected) 397 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_A; 398 else 399 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 400 } else { 401 skip = 1; 402 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 403 } 404 s->internal->init_num = 0; 405 break; 406 407 case SSL3_ST_SW_KEY_EXCH_A: 408 case SSL3_ST_SW_KEY_EXCH_B: 409 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 410 411 /* 412 * Only send if using a DH key exchange. 413 * 414 * For ECC ciphersuites, we send a ServerKeyExchange 415 * message only if the cipher suite is ECDHE. In other 416 * cases, the server certificate contains the server's 417 * public key for key exchange. 418 */ 419 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 420 if (SSL_is_dtls(s)) 421 dtls1_start_timer(s); 422 ret = ssl3_send_server_key_exchange(s); 423 if (ret <= 0) 424 goto end; 425 } else 426 skip = 1; 427 428 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_A; 429 s->internal->init_num = 0; 430 break; 431 432 case SSL3_ST_SW_CERT_REQ_A: 433 case SSL3_ST_SW_CERT_REQ_B: 434 /* 435 * Determine whether or not we need to request a 436 * certificate. 437 * 438 * Do not request a certificate if: 439 * 440 * - We did not ask for it (SSL_VERIFY_PEER is unset). 441 * 442 * - SSL_VERIFY_CLIENT_ONCE is set and we are 443 * renegotiating. 444 * 445 * - We are using an anonymous ciphersuites 446 * (see section "Certificate request" in SSL 3 drafts 447 * and in RFC 2246) ... except when the application 448 * insists on verification (against the specs, but 449 * s3_clnt.c accepts this for SSL 3). 450 */ 451 if (!(s->verify_mode & SSL_VERIFY_PEER) || 452 ((s->session->peer != NULL) && 453 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 454 ((S3I(s)->hs.new_cipher->algorithm_auth & 455 SSL_aNULL) && !(s->verify_mode & 456 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) { 457 /* No cert request. */ 458 skip = 1; 459 S3I(s)->tmp.cert_request = 0; 460 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; 461 462 if (!SSL_is_dtls(s)) 463 tls1_transcript_free(s); 464 } else { 465 S3I(s)->tmp.cert_request = 1; 466 if (SSL_is_dtls(s)) 467 dtls1_start_timer(s); 468 ret = ssl3_send_certificate_request(s); 469 if (ret <= 0) 470 goto end; 471 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; 472 s->internal->init_num = 0; 473 } 474 break; 475 476 case SSL3_ST_SW_SRVR_DONE_A: 477 case SSL3_ST_SW_SRVR_DONE_B: 478 if (SSL_is_dtls(s)) 479 dtls1_start_timer(s); 480 ret = ssl3_send_server_done(s); 481 if (ret <= 0) 482 goto end; 483 S3I(s)->hs.next_state = SSL3_ST_SR_CERT_A; 484 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 485 s->internal->init_num = 0; 486 break; 487 488 case SSL3_ST_SW_FLUSH: 489 /* 490 * This code originally checked to see if 491 * any data was pending using BIO_CTRL_INFO 492 * and then flushed. This caused problems 493 * as documented in PR#1939. The proposed 494 * fix doesn't completely resolve this issue 495 * as buggy implementations of BIO_CTRL_PENDING 496 * still exist. So instead we just flush 497 * unconditionally. 498 */ 499 s->internal->rwstate = SSL_WRITING; 500 if (BIO_flush(s->wbio) <= 0) { 501 if (SSL_is_dtls(s)) { 502 /* If the write error was fatal, stop trying. */ 503 if (!BIO_should_retry(s->wbio)) { 504 s->internal->rwstate = SSL_NOTHING; 505 S3I(s)->hs.state = S3I(s)->hs.next_state; 506 } 507 } 508 ret = -1; 509 goto end; 510 } 511 s->internal->rwstate = SSL_NOTHING; 512 S3I(s)->hs.state = S3I(s)->hs.next_state; 513 break; 514 515 case SSL3_ST_SR_CERT_A: 516 case SSL3_ST_SR_CERT_B: 517 if (S3I(s)->tmp.cert_request) { 518 ret = ssl3_get_client_certificate(s); 519 if (ret <= 0) 520 goto end; 521 } 522 s->internal->init_num = 0; 523 S3I(s)->hs.state = SSL3_ST_SR_KEY_EXCH_A; 524 break; 525 526 case SSL3_ST_SR_KEY_EXCH_A: 527 case SSL3_ST_SR_KEY_EXCH_B: 528 ret = ssl3_get_client_key_exchange(s); 529 if (ret <= 0) 530 goto end; 531 532 if (SSL_is_dtls(s)) { 533 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 534 s->internal->init_num = 0; 535 } 536 537 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 538 if (ret == 2) { 539 /* 540 * For the ECDH ciphersuites when 541 * the client sends its ECDH pub key in 542 * a certificate, the CertificateVerify 543 * message is not sent. 544 * Also for GOST ciphersuites when 545 * the client uses its key from the certificate 546 * for key exchange. 547 */ 548 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; 549 s->internal->init_num = 0; 550 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) { 551 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 552 s->internal->init_num = 0; 553 if (!s->session->peer) 554 break; 555 /* 556 * Freeze the transcript for use during client 557 * certificate verification. 558 */ 559 tls1_transcript_freeze(s); 560 } else { 561 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 562 s->internal->init_num = 0; 563 564 tls1_transcript_free(s); 565 566 /* 567 * We need to get hashes here so if there is 568 * a client cert, it can be verified. 569 */ 570 if (!tls1_transcript_hash_value(s, 571 S3I(s)->tmp.cert_verify_md, 572 sizeof(S3I(s)->tmp.cert_verify_md), 573 NULL)) { 574 ret = -1; 575 goto end; 576 } 577 } 578 break; 579 580 case SSL3_ST_SR_CERT_VRFY_A: 581 case SSL3_ST_SR_CERT_VRFY_B: 582 if (SSL_is_dtls(s)) 583 D1I(s)->change_cipher_spec_ok = 1; 584 else 585 s->s3->flags |= SSL3_FLAGS_CCS_OK; 586 587 /* we should decide if we expected this one */ 588 ret = ssl3_get_cert_verify(s); 589 if (ret <= 0) 590 goto end; 591 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; 592 s->internal->init_num = 0; 593 break; 594 595 case SSL3_ST_SR_FINISHED_A: 596 case SSL3_ST_SR_FINISHED_B: 597 if (SSL_is_dtls(s)) 598 D1I(s)->change_cipher_spec_ok = 1; 599 else 600 s->s3->flags |= SSL3_FLAGS_CCS_OK; 601 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 602 SSL3_ST_SR_FINISHED_B); 603 if (ret <= 0) 604 goto end; 605 if (SSL_is_dtls(s)) 606 dtls1_stop_timer(s); 607 if (s->internal->hit) 608 S3I(s)->hs.state = SSL_ST_OK; 609 else if (s->internal->tlsext_ticket_expected) 610 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 611 else 612 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 613 s->internal->init_num = 0; 614 break; 615 616 case SSL3_ST_SW_SESSION_TICKET_A: 617 case SSL3_ST_SW_SESSION_TICKET_B: 618 ret = ssl3_send_newsession_ticket(s); 619 if (ret <= 0) 620 goto end; 621 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 622 s->internal->init_num = 0; 623 break; 624 625 case SSL3_ST_SW_CERT_STATUS_A: 626 case SSL3_ST_SW_CERT_STATUS_B: 627 ret = ssl3_send_cert_status(s); 628 if (ret <= 0) 629 goto end; 630 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 631 s->internal->init_num = 0; 632 break; 633 634 case SSL3_ST_SW_CHANGE_A: 635 case SSL3_ST_SW_CHANGE_B: 636 s->session->cipher = S3I(s)->hs.new_cipher; 637 if (!tls1_setup_key_block(s)) { 638 ret = -1; 639 goto end; 640 } 641 642 ret = ssl3_send_change_cipher_spec(s, 643 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B); 644 if (ret <= 0) 645 goto end; 646 S3I(s)->hs.state = SSL3_ST_SW_FINISHED_A; 647 s->internal->init_num = 0; 648 649 if (!tls1_change_cipher_state(s, 650 SSL3_CHANGE_CIPHER_SERVER_WRITE)) { 651 ret = -1; 652 goto end; 653 } 654 655 if (SSL_is_dtls(s)) 656 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 657 break; 658 659 case SSL3_ST_SW_FINISHED_A: 660 case SSL3_ST_SW_FINISHED_B: 661 ret = ssl3_send_finished(s, 662 SSL3_ST_SW_FINISHED_A, SSL3_ST_SW_FINISHED_B, 663 TLS_MD_SERVER_FINISH_CONST, 664 TLS_MD_SERVER_FINISH_CONST_SIZE); 665 if (ret <= 0) 666 goto end; 667 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 668 if (s->internal->hit) { 669 S3I(s)->hs.next_state = SSL3_ST_SR_FINISHED_A; 670 tls1_transcript_free(s); 671 } else 672 S3I(s)->hs.next_state = SSL_ST_OK; 673 s->internal->init_num = 0; 674 break; 675 676 case SSL_ST_OK: 677 /* clean a few things up */ 678 tls1_cleanup_key_block(s); 679 680 if (S3I(s)->handshake_transcript != NULL) { 681 SSLerror(s, ERR_R_INTERNAL_ERROR); 682 ret = -1; 683 goto end; 684 } 685 686 if (!SSL_is_dtls(s)) 687 ssl3_release_init_buffer(s); 688 689 /* remove buffering on output */ 690 ssl_free_wbio_buffer(s); 691 692 s->internal->init_num = 0; 693 694 /* Skipped if we just sent a HelloRequest. */ 695 if (s->internal->renegotiate == 2) { 696 s->internal->renegotiate = 0; 697 s->internal->new_session = 0; 698 699 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 700 701 s->ctx->internal->stats.sess_accept_good++; 702 /* s->server=1; */ 703 s->internal->handshake_func = ssl3_accept; 704 705 if (cb != NULL) 706 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 707 } 708 709 ret = 1; 710 711 if (SSL_is_dtls(s)) { 712 /* Done handshaking, next message is client hello. */ 713 D1I(s)->handshake_read_seq = 0; 714 /* Next message is server hello. */ 715 D1I(s)->handshake_write_seq = 0; 716 D1I(s)->next_handshake_write_seq = 0; 717 } 718 goto end; 719 /* break; */ 720 721 default: 722 SSLerror(s, SSL_R_UNKNOWN_STATE); 723 ret = -1; 724 goto end; 725 /* break; */ 726 } 727 728 if (!S3I(s)->tmp.reuse_message && !skip) { 729 if (s->internal->debug) { 730 if ((ret = BIO_flush(s->wbio)) <= 0) 731 goto end; 732 } 733 734 735 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 736 new_state = S3I(s)->hs.state; 737 S3I(s)->hs.state = state; 738 cb(s, SSL_CB_ACCEPT_LOOP, 1); 739 S3I(s)->hs.state = new_state; 740 } 741 } 742 skip = 0; 743 } 744 end: 745 /* BIO_flush(s->wbio); */ 746 s->internal->in_handshake--; 747 if (cb != NULL) 748 cb(s, SSL_CB_ACCEPT_EXIT, ret); 749 750 return (ret); 751 } 752 753 int 754 ssl3_send_hello_request(SSL *s) 755 { 756 CBB cbb, hello; 757 758 memset(&cbb, 0, sizeof(cbb)); 759 760 if (S3I(s)->hs.state == SSL3_ST_SW_HELLO_REQ_A) { 761 if (!ssl3_handshake_msg_start(s, &cbb, &hello, 762 SSL3_MT_HELLO_REQUEST)) 763 goto err; 764 if (!ssl3_handshake_msg_finish(s, &cbb)) 765 goto err; 766 767 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_B; 768 } 769 770 /* SSL3_ST_SW_HELLO_REQ_B */ 771 return (ssl3_handshake_write(s)); 772 773 err: 774 CBB_cleanup(&cbb); 775 776 return (-1); 777 } 778 779 int 780 ssl3_get_client_hello(SSL *s) 781 { 782 CBS cbs, client_random, session_id, cookie, cipher_suites; 783 CBS compression_methods; 784 uint16_t client_version; 785 uint8_t comp_method; 786 int comp_null; 787 int i, j, ok, al, ret = -1, cookie_valid = 0; 788 long n; 789 unsigned long id; 790 SSL_CIPHER *c; 791 STACK_OF(SSL_CIPHER) *ciphers = NULL; 792 unsigned long alg_k; 793 const SSL_METHOD *method; 794 uint16_t max_version, shared_version; 795 796 /* 797 * We do this so that we will respond with our native type. 798 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, 799 * This down switching should be handled by a different method. 800 * If we are SSLv3, we will respond with SSLv3, even if prompted with 801 * TLSv1. 802 */ 803 if (S3I(s)->hs.state == SSL3_ST_SR_CLNT_HELLO_A) { 804 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_B; 805 } 806 807 s->internal->first_packet = 1; 808 n = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, 809 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, 810 SSL3_RT_MAX_PLAIN_LENGTH, &ok); 811 if (!ok) 812 return ((int)n); 813 s->internal->first_packet = 0; 814 815 if (n < 0) 816 goto err; 817 818 CBS_init(&cbs, s->internal->init_msg, n); 819 820 /* Parse client hello up until the extensions (if any). */ 821 if (!CBS_get_u16(&cbs, &client_version)) 822 goto decode_err; 823 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE)) 824 goto decode_err; 825 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 826 goto decode_err; 827 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 828 al = SSL_AD_ILLEGAL_PARAMETER; 829 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 830 goto fatal_err; 831 } 832 if (SSL_is_dtls(s)) { 833 if (!CBS_get_u8_length_prefixed(&cbs, &cookie)) 834 goto decode_err; 835 } 836 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites)) 837 goto decode_err; 838 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods)) 839 goto decode_err; 840 841 /* 842 * Use version from inside client hello, not from record header. 843 * (may differ: see RFC 2246, Appendix E, second paragraph) 844 */ 845 if (!ssl_downgrade_max_version(s, &max_version)) 846 goto err; 847 if (ssl_max_shared_version(s, client_version, &shared_version) != 1) { 848 if ((s->client_version >> 8) == SSL3_VERSION_MAJOR && 849 !tls12_record_layer_write_protected(s->internal->rl)) { 850 /* 851 * Similar to ssl3_get_record, send alert using remote 852 * version number. 853 */ 854 s->version = s->client_version; 855 } 856 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER); 857 al = SSL_AD_PROTOCOL_VERSION; 858 goto fatal_err; 859 } 860 s->client_version = client_version; 861 s->version = shared_version; 862 863 if ((method = ssl_get_method(shared_version)) == NULL) { 864 SSLerror(s, ERR_R_INTERNAL_ERROR); 865 goto err; 866 } 867 s->method = method; 868 869 /* 870 * If we require cookies (DTLS) and this ClientHello does not contain 871 * one, just return since we do not want to allocate any memory yet. 872 * So check cookie length... 873 */ 874 if (SSL_is_dtls(s)) { 875 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 876 if (CBS_len(&cookie) == 0) 877 return (1); 878 } 879 } 880 881 if (!CBS_write_bytes(&client_random, s->s3->client_random, 882 sizeof(s->s3->client_random), NULL)) 883 goto err; 884 885 s->internal->hit = 0; 886 887 /* 888 * Versions before 0.9.7 always allow clients to resume sessions in 889 * renegotiation. 0.9.7 and later allow this by default, but optionally 890 * ignore resumption requests with flag 891 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag 892 * rather than a change to default behavior so that applications 893 * relying on this for security won't even compile against older 894 * library versions). 895 * 896 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() 897 * to request renegotiation but not a new session (s->internal->new_session 898 * remains unset): for servers, this essentially just means that the 899 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be 900 * ignored. 901 */ 902 if ((s->internal->new_session && (s->internal->options & 903 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { 904 if (!ssl_get_new_session(s, 1)) 905 goto err; 906 } else { 907 CBS ext_block; 908 909 CBS_dup(&cbs, &ext_block); 910 911 i = ssl_get_prev_session(s, &session_id, &ext_block, &al); 912 if (i == 1) { /* previous session */ 913 s->internal->hit = 1; 914 } else if (i == -1) 915 goto fatal_err; 916 else { 917 /* i == 0 */ 918 if (!ssl_get_new_session(s, 1)) 919 goto err; 920 } 921 } 922 923 if (SSL_is_dtls(s)) { 924 /* 925 * The ClientHello may contain a cookie even if the HelloVerify 926 * message has not been sent - make sure that it does not cause 927 * an overflow. 928 */ 929 if (CBS_len(&cookie) > sizeof(D1I(s)->rcvd_cookie)) { 930 al = SSL_AD_DECODE_ERROR; 931 SSLerror(s, SSL_R_COOKIE_MISMATCH); 932 goto fatal_err; 933 } 934 935 /* Verify the cookie if appropriate option is set. */ 936 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && 937 CBS_len(&cookie) > 0) { 938 size_t cookie_len; 939 940 /* XXX - rcvd_cookie seems to only be used here... */ 941 if (!CBS_write_bytes(&cookie, D1I(s)->rcvd_cookie, 942 sizeof(D1I(s)->rcvd_cookie), &cookie_len)) 943 goto err; 944 945 if (s->ctx->internal->app_verify_cookie_cb != NULL) { 946 if (s->ctx->internal->app_verify_cookie_cb(s, 947 D1I(s)->rcvd_cookie, cookie_len) == 0) { 948 al = SSL_AD_HANDSHAKE_FAILURE; 949 SSLerror(s, SSL_R_COOKIE_MISMATCH); 950 goto fatal_err; 951 } 952 /* else cookie verification succeeded */ 953 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */ 954 } else if (timingsafe_memcmp(D1I(s)->rcvd_cookie, 955 D1I(s)->cookie, D1I(s)->cookie_len) != 0) { 956 /* default verification */ 957 al = SSL_AD_HANDSHAKE_FAILURE; 958 SSLerror(s, SSL_R_COOKIE_MISMATCH); 959 goto fatal_err; 960 } 961 cookie_valid = 1; 962 } 963 } 964 965 /* XXX - This logic seems wrong... */ 966 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) { 967 /* we need a cipher if we are not resuming a session */ 968 al = SSL_AD_ILLEGAL_PARAMETER; 969 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED); 970 goto fatal_err; 971 } 972 973 if (CBS_len(&cipher_suites) > 0) { 974 if ((ciphers = ssl_bytes_to_cipher_list(s, 975 &cipher_suites)) == NULL) 976 goto err; 977 } 978 979 /* If it is a hit, check that the cipher is in the list */ 980 /* XXX - CBS_len(&cipher_suites) will always be zero here... */ 981 if (s->internal->hit && CBS_len(&cipher_suites) > 0) { 982 j = 0; 983 id = s->session->cipher->id; 984 985 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 986 c = sk_SSL_CIPHER_value(ciphers, i); 987 if (c->id == id) { 988 j = 1; 989 break; 990 } 991 } 992 if (j == 0) { 993 /* 994 * We need to have the cipher in the cipher 995 * list if we are asked to reuse it 996 */ 997 al = SSL_AD_ILLEGAL_PARAMETER; 998 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING); 999 goto fatal_err; 1000 } 1001 } 1002 1003 comp_null = 0; 1004 while (CBS_len(&compression_methods) > 0) { 1005 if (!CBS_get_u8(&compression_methods, &comp_method)) 1006 goto decode_err; 1007 if (comp_method == 0) 1008 comp_null = 1; 1009 } 1010 if (comp_null == 0) { 1011 al = SSL_AD_DECODE_ERROR; 1012 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED); 1013 goto fatal_err; 1014 } 1015 1016 if (!tlsext_server_parse(s, SSL_TLSEXT_MSG_CH, &cbs, &al)) { 1017 SSLerror(s, SSL_R_PARSE_TLSEXT); 1018 goto fatal_err; 1019 } 1020 1021 if (!S3I(s)->renegotiate_seen && s->internal->renegotiate) { 1022 al = SSL_AD_HANDSHAKE_FAILURE; 1023 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1024 goto fatal_err; 1025 } 1026 1027 if (ssl_check_clienthello_tlsext_early(s) <= 0) { 1028 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1029 goto err; 1030 } 1031 1032 /* 1033 * Check if we want to use external pre-shared secret for this 1034 * handshake for not reused session only. We need to generate 1035 * server_random before calling tls_session_secret_cb in order to allow 1036 * SessionTicket processing to use it in key derivation. 1037 */ 1038 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE); 1039 1040 if (!SSL_is_dtls(s) && max_version >= TLS1_2_VERSION && 1041 s->version < max_version) { 1042 /* 1043 * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3 1044 * we must set the last 8 bytes of the server random to magical 1045 * values to indicate we meant to downgrade. For TLS 1.2 it is 1046 * recommended that we do the same. 1047 */ 1048 size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12); 1049 uint8_t *magic = &s->s3->server_random[index]; 1050 if (s->version == TLS1_2_VERSION) { 1051 /* Indicate we chose to downgrade to 1.2. */ 1052 memcpy(magic, tls13_downgrade_12, 1053 sizeof(tls13_downgrade_12)); 1054 } else { 1055 /* Indicate we chose to downgrade to 1.1 or lower */ 1056 memcpy(magic, tls13_downgrade_11, 1057 sizeof(tls13_downgrade_11)); 1058 } 1059 } 1060 1061 if (!s->internal->hit && s->internal->tls_session_secret_cb) { 1062 SSL_CIPHER *pref_cipher = NULL; 1063 1064 s->session->master_key_length = sizeof(s->session->master_key); 1065 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 1066 &s->session->master_key_length, ciphers, &pref_cipher, 1067 s->internal->tls_session_secret_cb_arg)) { 1068 s->internal->hit = 1; 1069 s->session->ciphers = ciphers; 1070 s->session->verify_result = X509_V_OK; 1071 1072 ciphers = NULL; 1073 1074 /* check if some cipher was preferred by call back */ 1075 pref_cipher = pref_cipher ? pref_cipher : 1076 ssl3_choose_cipher(s, s->session->ciphers, 1077 SSL_get_ciphers(s)); 1078 if (pref_cipher == NULL) { 1079 al = SSL_AD_HANDSHAKE_FAILURE; 1080 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1081 goto fatal_err; 1082 } 1083 1084 s->session->cipher = pref_cipher; 1085 1086 sk_SSL_CIPHER_free(s->cipher_list); 1087 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); 1088 } 1089 } 1090 1091 /* 1092 * Given s->session->ciphers and SSL_get_ciphers, we must 1093 * pick a cipher 1094 */ 1095 1096 if (!s->internal->hit) { 1097 sk_SSL_CIPHER_free(s->session->ciphers); 1098 s->session->ciphers = ciphers; 1099 if (ciphers == NULL) { 1100 al = SSL_AD_ILLEGAL_PARAMETER; 1101 SSLerror(s, SSL_R_NO_CIPHERS_PASSED); 1102 goto fatal_err; 1103 } 1104 ciphers = NULL; 1105 c = ssl3_choose_cipher(s, s->session->ciphers, 1106 SSL_get_ciphers(s)); 1107 1108 if (c == NULL) { 1109 al = SSL_AD_HANDSHAKE_FAILURE; 1110 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1111 goto fatal_err; 1112 } 1113 S3I(s)->hs.new_cipher = c; 1114 } else { 1115 S3I(s)->hs.new_cipher = s->session->cipher; 1116 } 1117 1118 if (!tls1_transcript_hash_init(s)) 1119 goto err; 1120 1121 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1122 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) || 1123 !(s->verify_mode & SSL_VERIFY_PEER)) 1124 tls1_transcript_free(s); 1125 1126 /* 1127 * We now have the following setup. 1128 * client_random 1129 * cipher_list - our prefered list of ciphers 1130 * ciphers - the clients prefered list of ciphers 1131 * compression - basically ignored right now 1132 * ssl version is set - sslv3 1133 * s->session - The ssl session has been setup. 1134 * s->internal->hit - session reuse flag 1135 * s->hs.new_cipher - the new cipher to use. 1136 */ 1137 1138 /* Handles TLS extensions that we couldn't check earlier */ 1139 if (ssl_check_clienthello_tlsext_late(s) <= 0) { 1140 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1141 goto err; 1142 } 1143 1144 ret = cookie_valid ? 2 : 1; 1145 1146 if (0) { 1147 decode_err: 1148 al = SSL_AD_DECODE_ERROR; 1149 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1150 fatal_err: 1151 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1152 } 1153 err: 1154 sk_SSL_CIPHER_free(ciphers); 1155 1156 return (ret); 1157 } 1158 1159 int 1160 ssl3_send_dtls_hello_verify_request(SSL *s) 1161 { 1162 CBB cbb, verify, cookie; 1163 1164 memset(&cbb, 0, sizeof(cbb)); 1165 1166 if (S3I(s)->hs.state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 1167 if (s->ctx->internal->app_gen_cookie_cb == NULL || 1168 s->ctx->internal->app_gen_cookie_cb(s, D1I(s)->cookie, 1169 &(D1I(s)->cookie_len)) == 0) { 1170 SSLerror(s, ERR_R_INTERNAL_ERROR); 1171 return 0; 1172 } 1173 1174 /* 1175 * Per RFC 6347 section 4.2.1, the HelloVerifyRequest should 1176 * always contain DTLSv1.0 regardless of the version that is 1177 * going to be negotiated. 1178 */ 1179 if (!ssl3_handshake_msg_start(s, &cbb, &verify, 1180 DTLS1_MT_HELLO_VERIFY_REQUEST)) 1181 goto err; 1182 if (!CBB_add_u16(&verify, DTLS1_VERSION)) 1183 goto err; 1184 if (!CBB_add_u8_length_prefixed(&verify, &cookie)) 1185 goto err; 1186 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, D1I(s)->cookie_len)) 1187 goto err; 1188 if (!ssl3_handshake_msg_finish(s, &cbb)) 1189 goto err; 1190 1191 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 1192 } 1193 1194 /* S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 1195 return (ssl3_handshake_write(s)); 1196 1197 err: 1198 CBB_cleanup(&cbb); 1199 1200 return (-1); 1201 } 1202 1203 int 1204 ssl3_send_server_hello(SSL *s) 1205 { 1206 CBB cbb, server_hello, session_id; 1207 size_t sl; 1208 1209 memset(&cbb, 0, sizeof(cbb)); 1210 1211 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 1212 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello, 1213 SSL3_MT_SERVER_HELLO)) 1214 goto err; 1215 1216 if (!CBB_add_u16(&server_hello, s->version)) 1217 goto err; 1218 if (!CBB_add_bytes(&server_hello, s->s3->server_random, 1219 sizeof(s->s3->server_random))) 1220 goto err; 1221 1222 /* 1223 * There are several cases for the session ID to send 1224 * back in the server hello: 1225 * 1226 * - For session reuse from the session cache, 1227 * we send back the old session ID. 1228 * - If stateless session reuse (using a session ticket) 1229 * is successful, we send back the client's "session ID" 1230 * (which doesn't actually identify the session). 1231 * - If it is a new session, we send back the new 1232 * session ID. 1233 * - However, if we want the new session to be single-use, 1234 * we send back a 0-length session ID. 1235 * 1236 * s->internal->hit is non-zero in either case of session reuse, 1237 * so the following won't overwrite an ID that we're supposed 1238 * to send back. 1239 */ 1240 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER) 1241 && !s->internal->hit) 1242 s->session->session_id_length = 0; 1243 1244 sl = s->session->session_id_length; 1245 if (sl > sizeof(s->session->session_id)) { 1246 SSLerror(s, ERR_R_INTERNAL_ERROR); 1247 goto err; 1248 } 1249 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) 1250 goto err; 1251 if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) 1252 goto err; 1253 1254 /* Cipher suite. */ 1255 if (!CBB_add_u16(&server_hello, 1256 ssl3_cipher_get_value(S3I(s)->hs.new_cipher))) 1257 goto err; 1258 1259 /* Compression method (null). */ 1260 if (!CBB_add_u8(&server_hello, 0)) 1261 goto err; 1262 1263 /* TLS extensions */ 1264 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) { 1265 SSLerror(s, ERR_R_INTERNAL_ERROR); 1266 goto err; 1267 } 1268 1269 if (!ssl3_handshake_msg_finish(s, &cbb)) 1270 goto err; 1271 } 1272 1273 /* SSL3_ST_SW_SRVR_HELLO_B */ 1274 return (ssl3_handshake_write(s)); 1275 1276 err: 1277 CBB_cleanup(&cbb); 1278 1279 return (-1); 1280 } 1281 1282 int 1283 ssl3_send_server_done(SSL *s) 1284 { 1285 CBB cbb, done; 1286 1287 memset(&cbb, 0, sizeof(cbb)); 1288 1289 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) { 1290 if (!ssl3_handshake_msg_start(s, &cbb, &done, 1291 SSL3_MT_SERVER_DONE)) 1292 goto err; 1293 if (!ssl3_handshake_msg_finish(s, &cbb)) 1294 goto err; 1295 1296 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B; 1297 } 1298 1299 /* SSL3_ST_SW_SRVR_DONE_B */ 1300 return (ssl3_handshake_write(s)); 1301 1302 err: 1303 CBB_cleanup(&cbb); 1304 1305 return (-1); 1306 } 1307 1308 static int 1309 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) 1310 { 1311 CBB dh_p, dh_g, dh_Ys; 1312 DH *dh = NULL, *dhp; 1313 unsigned char *data; 1314 int al; 1315 1316 if (s->cert->dh_tmp_auto != 0) { 1317 if ((dhp = ssl_get_auto_dh(s)) == NULL) { 1318 al = SSL_AD_INTERNAL_ERROR; 1319 SSLerror(s, ERR_R_INTERNAL_ERROR); 1320 goto fatal_err; 1321 } 1322 } else 1323 dhp = s->cert->dh_tmp; 1324 1325 if (dhp == NULL && s->cert->dh_tmp_cb != NULL) 1326 dhp = s->cert->dh_tmp_cb(s, 0, 1327 SSL_C_PKEYLENGTH(S3I(s)->hs.new_cipher)); 1328 1329 if (dhp == NULL) { 1330 al = SSL_AD_HANDSHAKE_FAILURE; 1331 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1332 goto fatal_err; 1333 } 1334 1335 if (S3I(s)->tmp.dh != NULL) { 1336 SSLerror(s, ERR_R_INTERNAL_ERROR); 1337 goto err; 1338 } 1339 1340 if (s->cert->dh_tmp_auto != 0) { 1341 dh = dhp; 1342 } else if ((dh = DHparams_dup(dhp)) == NULL) { 1343 SSLerror(s, ERR_R_DH_LIB); 1344 goto err; 1345 } 1346 S3I(s)->tmp.dh = dh; 1347 if (!DH_generate_key(dh)) { 1348 SSLerror(s, ERR_R_DH_LIB); 1349 goto err; 1350 } 1351 1352 /* 1353 * Serialize the DH parameters and public key. 1354 */ 1355 if (!CBB_add_u16_length_prefixed(cbb, &dh_p)) 1356 goto err; 1357 if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p))) 1358 goto err; 1359 BN_bn2bin(dh->p, data); 1360 1361 if (!CBB_add_u16_length_prefixed(cbb, &dh_g)) 1362 goto err; 1363 if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g))) 1364 goto err; 1365 BN_bn2bin(dh->g, data); 1366 1367 if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys)) 1368 goto err; 1369 if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key))) 1370 goto err; 1371 BN_bn2bin(dh->pub_key, data); 1372 1373 if (!CBB_flush(cbb)) 1374 goto err; 1375 1376 return (1); 1377 1378 fatal_err: 1379 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1380 err: 1381 return (-1); 1382 } 1383 1384 static int 1385 ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb) 1386 { 1387 uint16_t curve_id; 1388 EC_KEY *ecdh; 1389 CBB ecpoint; 1390 int al; 1391 1392 /* 1393 * Only named curves are supported in ECDH ephemeral key exchanges. 1394 * For supported named curves, curve_id is non-zero. 1395 */ 1396 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1397 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1398 goto err; 1399 } 1400 1401 if (S3I(s)->tmp.ecdh != NULL) { 1402 SSLerror(s, ERR_R_INTERNAL_ERROR); 1403 goto err; 1404 } 1405 1406 if ((S3I(s)->tmp.ecdh = EC_KEY_new()) == NULL) { 1407 al = SSL_AD_HANDSHAKE_FAILURE; 1408 SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY); 1409 goto fatal_err; 1410 } 1411 S3I(s)->tmp.ecdh_nid = nid; 1412 ecdh = S3I(s)->tmp.ecdh; 1413 1414 if (!ssl_kex_generate_ecdhe_ecp(ecdh, nid)) 1415 goto err; 1416 1417 /* 1418 * Encode the public key. 1419 * 1420 * Only named curves are supported in ECDH ephemeral key exchanges. 1421 * In this case the ServerKeyExchange message has: 1422 * [1 byte CurveType], [2 byte CurveName] 1423 * [1 byte length of encoded point], followed by 1424 * the actual encoded point itself. 1425 */ 1426 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1427 goto err; 1428 if (!CBB_add_u16(cbb, curve_id)) 1429 goto err; 1430 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1431 goto err; 1432 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 1433 goto err; 1434 if (!CBB_flush(cbb)) 1435 goto err; 1436 1437 return (1); 1438 1439 fatal_err: 1440 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1441 err: 1442 return (-1); 1443 } 1444 1445 static int 1446 ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb) 1447 { 1448 uint8_t *public_key = NULL, *private_key = NULL; 1449 uint16_t curve_id; 1450 CBB ecpoint; 1451 int ret = -1; 1452 1453 /* Generate an X25519 key pair. */ 1454 if (S3I(s)->tmp.x25519 != NULL) { 1455 SSLerror(s, ERR_R_INTERNAL_ERROR); 1456 goto err; 1457 } 1458 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 1459 goto err; 1460 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 1461 goto err; 1462 X25519_keypair(public_key, private_key); 1463 1464 /* Serialize public key. */ 1465 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1466 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1467 goto err; 1468 } 1469 1470 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1471 goto err; 1472 if (!CBB_add_u16(cbb, curve_id)) 1473 goto err; 1474 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1475 goto err; 1476 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 1477 goto err; 1478 if (!CBB_flush(cbb)) 1479 goto err; 1480 1481 S3I(s)->tmp.x25519 = private_key; 1482 private_key = NULL; 1483 ret = 1; 1484 1485 err: 1486 free(public_key); 1487 freezero(private_key, X25519_KEY_LENGTH); 1488 1489 return (ret); 1490 } 1491 1492 static int 1493 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) 1494 { 1495 int nid; 1496 1497 nid = tls1_get_shared_curve(s); 1498 1499 if (nid == NID_X25519) 1500 return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb); 1501 1502 return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb); 1503 } 1504 1505 int 1506 ssl3_send_server_key_exchange(SSL *s) 1507 { 1508 CBB cbb, cbb_params, cbb_signature, server_kex; 1509 const struct ssl_sigalg *sigalg = NULL; 1510 unsigned char *signature = NULL; 1511 size_t signature_len = 0; 1512 unsigned char *params = NULL; 1513 size_t params_len; 1514 const EVP_MD *md = NULL; 1515 unsigned long type; 1516 EVP_MD_CTX md_ctx; 1517 EVP_PKEY_CTX *pctx; 1518 EVP_PKEY *pkey; 1519 int al; 1520 1521 memset(&cbb, 0, sizeof(cbb)); 1522 memset(&cbb_params, 0, sizeof(cbb_params)); 1523 1524 EVP_MD_CTX_init(&md_ctx); 1525 1526 if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) { 1527 1528 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex, 1529 SSL3_MT_SERVER_KEY_EXCHANGE)) 1530 goto err; 1531 1532 if (!CBB_init(&cbb_params, 0)) 1533 goto err; 1534 1535 type = S3I(s)->hs.new_cipher->algorithm_mkey; 1536 if (type & SSL_kDHE) { 1537 if (ssl3_send_server_kex_dhe(s, &cbb_params) != 1) 1538 goto err; 1539 } else if (type & SSL_kECDHE) { 1540 if (ssl3_send_server_kex_ecdhe(s, &cbb_params) != 1) 1541 goto err; 1542 } else { 1543 al = SSL_AD_HANDSHAKE_FAILURE; 1544 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1545 goto fatal_err; 1546 } 1547 1548 if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len)) 1549 goto err; 1550 1551 if (!CBB_add_bytes(&server_kex, params, params_len)) 1552 goto err; 1553 1554 /* Add signature unless anonymous. */ 1555 if (!(S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL)) { 1556 if ((pkey = ssl_get_sign_pkey(s, S3I(s)->hs.new_cipher, 1557 &md, &sigalg)) == NULL) { 1558 al = SSL_AD_DECODE_ERROR; 1559 goto fatal_err; 1560 } 1561 1562 /* Send signature algorithm. */ 1563 if (SSL_USE_SIGALGS(s)) { 1564 if (!CBB_add_u16(&server_kex, sigalg->value)) { 1565 al = SSL_AD_INTERNAL_ERROR; 1566 SSLerror(s, ERR_R_INTERNAL_ERROR); 1567 goto fatal_err; 1568 } 1569 } 1570 1571 if (!EVP_DigestSignInit(&md_ctx, &pctx, md, NULL, pkey)) { 1572 SSLerror(s, ERR_R_EVP_LIB); 1573 goto err; 1574 } 1575 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1576 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1577 RSA_PKCS1_PSS_PADDING) || 1578 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1579 SSLerror(s, ERR_R_EVP_LIB); 1580 goto err; 1581 } 1582 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->client_random, 1583 SSL3_RANDOM_SIZE)) { 1584 SSLerror(s, ERR_R_EVP_LIB); 1585 goto err; 1586 } 1587 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->server_random, 1588 SSL3_RANDOM_SIZE)) { 1589 SSLerror(s, ERR_R_EVP_LIB); 1590 goto err; 1591 } 1592 if (!EVP_DigestSignUpdate(&md_ctx, params, params_len)) { 1593 SSLerror(s, ERR_R_EVP_LIB); 1594 goto err; 1595 } 1596 if (!EVP_DigestSignFinal(&md_ctx, NULL, &signature_len) || 1597 !signature_len) { 1598 SSLerror(s, ERR_R_EVP_LIB); 1599 goto err; 1600 } 1601 if ((signature = calloc(1, signature_len)) == NULL) { 1602 SSLerror(s, ERR_R_MALLOC_FAILURE); 1603 goto err; 1604 } 1605 if (!EVP_DigestSignFinal(&md_ctx, signature, &signature_len)) { 1606 SSLerror(s, ERR_R_EVP_LIB); 1607 goto err; 1608 } 1609 1610 if (!CBB_add_u16_length_prefixed(&server_kex, 1611 &cbb_signature)) 1612 goto err; 1613 if (!CBB_add_bytes(&cbb_signature, signature, 1614 signature_len)) 1615 goto err; 1616 } 1617 1618 if (!ssl3_handshake_msg_finish(s, &cbb)) 1619 goto err; 1620 1621 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1622 } 1623 1624 EVP_MD_CTX_cleanup(&md_ctx); 1625 free(params); 1626 free(signature); 1627 1628 return (ssl3_handshake_write(s)); 1629 1630 fatal_err: 1631 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1632 err: 1633 CBB_cleanup(&cbb_params); 1634 CBB_cleanup(&cbb); 1635 EVP_MD_CTX_cleanup(&md_ctx); 1636 free(params); 1637 free(signature); 1638 1639 return (-1); 1640 } 1641 1642 int 1643 ssl3_send_certificate_request(SSL *s) 1644 { 1645 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1646 STACK_OF(X509_NAME) *sk = NULL; 1647 X509_NAME *name; 1648 int i; 1649 1650 /* 1651 * Certificate Request - RFC 5246 section 7.4.4. 1652 */ 1653 1654 memset(&cbb, 0, sizeof(cbb)); 1655 1656 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1657 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, 1658 SSL3_MT_CERTIFICATE_REQUEST)) 1659 goto err; 1660 1661 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1662 goto err; 1663 if (!ssl3_get_req_cert_types(s, &cert_types)) 1664 goto err; 1665 1666 if (SSL_USE_SIGALGS(s)) { 1667 if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs)) 1668 goto err; 1669 if (!ssl_sigalgs_build(&sigalgs, tls12_sigalgs, tls12_sigalgs_len)) 1670 goto err; 1671 } 1672 1673 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) 1674 goto err; 1675 1676 sk = SSL_get_client_CA_list(s); 1677 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1678 unsigned char *name_data; 1679 size_t name_len; 1680 1681 name = sk_X509_NAME_value(sk, i); 1682 name_len = i2d_X509_NAME(name, NULL); 1683 1684 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) 1685 goto err; 1686 if (!CBB_add_space(&dn, &name_data, name_len)) 1687 goto err; 1688 if (i2d_X509_NAME(name, &name_data) != name_len) 1689 goto err; 1690 } 1691 1692 if (!ssl3_handshake_msg_finish(s, &cbb)) 1693 goto err; 1694 1695 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B; 1696 } 1697 1698 /* SSL3_ST_SW_CERT_REQ_B */ 1699 return (ssl3_handshake_write(s)); 1700 1701 err: 1702 CBB_cleanup(&cbb); 1703 1704 return (-1); 1705 } 1706 1707 static int 1708 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs) 1709 { 1710 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; 1711 unsigned char *pms = NULL; 1712 unsigned char *p; 1713 size_t pms_len = 0; 1714 EVP_PKEY *pkey = NULL; 1715 RSA *rsa = NULL; 1716 CBS enc_pms; 1717 int decrypt_len; 1718 int al = -1; 1719 1720 arc4random_buf(fakekey, sizeof(fakekey)); 1721 fakekey[0] = s->client_version >> 8; 1722 fakekey[1] = s->client_version & 0xff; 1723 1724 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey; 1725 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || 1726 (pkey->pkey.rsa == NULL)) { 1727 al = SSL_AD_HANDSHAKE_FAILURE; 1728 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); 1729 goto fatal_err; 1730 } 1731 rsa = pkey->pkey.rsa; 1732 1733 pms_len = RSA_size(rsa); 1734 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH) 1735 goto err; 1736 if ((pms = malloc(pms_len)) == NULL) 1737 goto err; 1738 p = pms; 1739 1740 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms)) 1741 goto decode_err; 1742 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) { 1743 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1744 goto err; 1745 } 1746 1747 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms), 1748 pms, rsa, RSA_PKCS1_PADDING); 1749 1750 ERR_clear_error(); 1751 1752 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) { 1753 al = SSL_AD_DECODE_ERROR; 1754 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ 1755 } 1756 1757 if ((al == -1) && !((pms[0] == (s->client_version >> 8)) && 1758 (pms[1] == (s->client_version & 0xff)))) { 1759 /* 1760 * The premaster secret must contain the same version number 1761 * as the ClientHello to detect version rollback attacks 1762 * (strangely, the protocol does not offer such protection for 1763 * DH ciphersuites). 1764 * 1765 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack 1766 * (http://eprint.iacr.org/2003/052/) exploits the version 1767 * number check as a "bad version oracle" -- an alert would 1768 * reveal that the plaintext corresponding to some ciphertext 1769 * made up by the adversary is properly formatted except that 1770 * the version number is wrong. To avoid such attacks, we should 1771 * treat this just like any other decryption error. 1772 */ 1773 al = SSL_AD_DECODE_ERROR; 1774 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ 1775 } 1776 1777 if (al != -1) { 1778 /* 1779 * Some decryption failure -- use random value instead 1780 * as countermeasure against Bleichenbacher's attack 1781 * on PKCS #1 v1.5 RSA padding (see RFC 2246, 1782 * section 7.4.7.1). 1783 */ 1784 p = fakekey; 1785 } 1786 1787 s->session->master_key_length = 1788 tls1_generate_master_secret(s, 1789 s->session->master_key, p, SSL_MAX_MASTER_KEY_LENGTH); 1790 1791 freezero(pms, pms_len); 1792 1793 return (1); 1794 1795 decode_err: 1796 al = SSL_AD_DECODE_ERROR; 1797 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1798 fatal_err: 1799 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1800 err: 1801 freezero(pms, pms_len); 1802 1803 return (-1); 1804 } 1805 1806 static int 1807 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) 1808 { 1809 int key_size = 0; 1810 int key_is_invalid, key_len, al; 1811 unsigned char *key = NULL; 1812 BIGNUM *bn = NULL; 1813 CBS dh_Yc; 1814 DH *dh; 1815 1816 if (!CBS_get_u16_length_prefixed(cbs, &dh_Yc)) 1817 goto decode_err; 1818 if (CBS_len(cbs) != 0) 1819 goto decode_err; 1820 1821 if (S3I(s)->tmp.dh == NULL) { 1822 al = SSL_AD_HANDSHAKE_FAILURE; 1823 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1824 goto fatal_err; 1825 } 1826 dh = S3I(s)->tmp.dh; 1827 1828 if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) { 1829 SSLerror(s, SSL_R_BN_LIB); 1830 goto err; 1831 } 1832 1833 if ((key_size = DH_size(dh)) <= 0) { 1834 SSLerror(s, ERR_R_DH_LIB); 1835 goto err; 1836 } 1837 if ((key = malloc(key_size)) == NULL) { 1838 SSLerror(s, ERR_R_MALLOC_FAILURE); 1839 goto err; 1840 } 1841 if (!DH_check_pub_key(dh, bn, &key_is_invalid)) { 1842 al = SSL_AD_INTERNAL_ERROR; 1843 SSLerror(s, ERR_R_DH_LIB); 1844 goto fatal_err; 1845 } 1846 if (key_is_invalid) { 1847 al = SSL_AD_ILLEGAL_PARAMETER; 1848 SSLerror(s, ERR_R_DH_LIB); 1849 goto fatal_err; 1850 } 1851 if ((key_len = DH_compute_key(key, bn, dh)) <= 0) { 1852 al = SSL_AD_INTERNAL_ERROR; 1853 SSLerror(s, ERR_R_DH_LIB); 1854 goto fatal_err; 1855 } 1856 1857 s->session->master_key_length = tls1_generate_master_secret(s, 1858 s->session->master_key, key, key_len); 1859 1860 DH_free(S3I(s)->tmp.dh); 1861 S3I(s)->tmp.dh = NULL; 1862 1863 freezero(key, key_size); 1864 BN_clear_free(bn); 1865 1866 return (1); 1867 1868 decode_err: 1869 al = SSL_AD_DECODE_ERROR; 1870 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1871 fatal_err: 1872 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1873 err: 1874 freezero(key, key_size); 1875 BN_clear_free(bn); 1876 1877 return (-1); 1878 } 1879 1880 static int 1881 ssl3_get_client_kex_ecdhe_ecp(SSL *s, CBS *cbs) 1882 { 1883 uint8_t *key = NULL; 1884 size_t key_len = 0; 1885 EC_KEY *ecdh_peer = NULL; 1886 EC_KEY *ecdh; 1887 CBS public; 1888 int ret = -1; 1889 1890 /* 1891 * Use the ephemeral values we saved when generating the 1892 * ServerKeyExchange message. 1893 */ 1894 if ((ecdh = S3I(s)->tmp.ecdh) == NULL) { 1895 SSLerror(s, ERR_R_INTERNAL_ERROR); 1896 goto err; 1897 } 1898 1899 /* 1900 * Get client's public key from encoded point in the ClientKeyExchange 1901 * message. 1902 */ 1903 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1904 goto err; 1905 if (CBS_len(cbs) != 0) 1906 goto err; 1907 1908 if ((ecdh_peer = EC_KEY_new()) == NULL) 1909 goto err; 1910 1911 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh_peer, S3I(s)->tmp.ecdh_nid, 1912 &public)) 1913 goto err; 1914 1915 /* Derive the shared secret and compute master secret. */ 1916 if (!ssl_kex_derive_ecdhe_ecp(ecdh, ecdh_peer, &key, &key_len)) 1917 goto err; 1918 s->session->master_key_length = tls1_generate_master_secret(s, 1919 s->session->master_key, key, key_len); 1920 1921 EC_KEY_free(S3I(s)->tmp.ecdh); 1922 S3I(s)->tmp.ecdh = NULL; 1923 S3I(s)->tmp.ecdh_nid = NID_undef; 1924 1925 ret = 1; 1926 1927 err: 1928 freezero(key, key_len); 1929 EC_KEY_free(ecdh_peer); 1930 1931 return (ret); 1932 } 1933 1934 static int 1935 ssl3_get_client_kex_ecdhe_ecx(SSL *s, CBS *cbs) 1936 { 1937 uint8_t *shared_key = NULL; 1938 CBS ecpoint; 1939 int ret = -1; 1940 1941 if (!CBS_get_u8_length_prefixed(cbs, &ecpoint)) 1942 goto err; 1943 if (CBS_len(cbs) != 0) 1944 goto err; 1945 if (CBS_len(&ecpoint) != X25519_KEY_LENGTH) 1946 goto err; 1947 1948 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 1949 goto err; 1950 if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint))) 1951 goto err; 1952 1953 freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH); 1954 S3I(s)->tmp.x25519 = NULL; 1955 1956 s->session->master_key_length = 1957 tls1_generate_master_secret( 1958 s, s->session->master_key, shared_key, X25519_KEY_LENGTH); 1959 1960 ret = 1; 1961 1962 err: 1963 freezero(shared_key, X25519_KEY_LENGTH); 1964 1965 return (ret); 1966 } 1967 1968 static int 1969 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) 1970 { 1971 if (S3I(s)->tmp.x25519 != NULL) 1972 return ssl3_get_client_kex_ecdhe_ecx(s, cbs); 1973 1974 return ssl3_get_client_kex_ecdhe_ecp(s, cbs); 1975 } 1976 1977 static int 1978 ssl3_get_client_kex_gost(SSL *s, CBS *cbs) 1979 { 1980 EVP_PKEY_CTX *pkey_ctx; 1981 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; 1982 unsigned char premaster_secret[32]; 1983 unsigned long alg_a; 1984 size_t outlen = 32; 1985 CBS gostblob; 1986 int al; 1987 int ret = 0; 1988 1989 /* Get our certificate private key*/ 1990 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1991 if (alg_a & SSL_aGOST01) 1992 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 1993 1994 if ((pkey_ctx = EVP_PKEY_CTX_new(pk, NULL)) == NULL) 1995 goto err; 1996 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) 1997 goto gerr; 1998 1999 /* 2000 * If client certificate is present and is of the same type, 2001 * maybe use it for key exchange. 2002 * Don't mind errors from EVP_PKEY_derive_set_peer, because 2003 * it is completely valid to use a client certificate for 2004 * authorization only. 2005 */ 2006 if ((client_pub_pkey = X509_get_pubkey(s->session->peer)) != NULL) { 2007 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2008 client_pub_pkey) <= 0) 2009 ERR_clear_error(); 2010 } 2011 2012 /* Decrypt session key */ 2013 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) 2014 goto decode_err; 2015 if (CBS_len(cbs) != 0) 2016 goto decode_err; 2017 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 2018 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { 2019 SSLerror(s, SSL_R_DECRYPTION_FAILED); 2020 goto gerr; 2021 } 2022 2023 /* Generate master secret */ 2024 s->session->master_key_length = 2025 tls1_generate_master_secret( 2026 s, s->session->master_key, premaster_secret, 32); 2027 2028 /* Check if pubkey from client certificate was used */ 2029 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, 2030 EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) 2031 ret = 2; 2032 else 2033 ret = 1; 2034 gerr: 2035 EVP_PKEY_free(client_pub_pkey); 2036 EVP_PKEY_CTX_free(pkey_ctx); 2037 if (ret) 2038 return (ret); 2039 else 2040 goto err; 2041 2042 decode_err: 2043 al = SSL_AD_DECODE_ERROR; 2044 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2045 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2046 err: 2047 return (-1); 2048 } 2049 2050 int 2051 ssl3_get_client_key_exchange(SSL *s) 2052 { 2053 unsigned long alg_k; 2054 int al, ok; 2055 CBS cbs; 2056 long n; 2057 2058 /* 2048 maxlen is a guess. How long a key does that permit? */ 2059 n = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 2060 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok); 2061 if (!ok) 2062 return ((int)n); 2063 2064 if (n < 0) 2065 goto err; 2066 2067 CBS_init(&cbs, s->internal->init_msg, n); 2068 2069 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2070 2071 if (alg_k & SSL_kRSA) { 2072 if (ssl3_get_client_kex_rsa(s, &cbs) != 1) 2073 goto err; 2074 } else if (alg_k & SSL_kDHE) { 2075 if (ssl3_get_client_kex_dhe(s, &cbs) != 1) 2076 goto err; 2077 } else if (alg_k & SSL_kECDHE) { 2078 if (ssl3_get_client_kex_ecdhe(s, &cbs) != 1) 2079 goto err; 2080 } else if (alg_k & SSL_kGOST) { 2081 if (ssl3_get_client_kex_gost(s, &cbs) != 1) 2082 goto err; 2083 } else { 2084 al = SSL_AD_HANDSHAKE_FAILURE; 2085 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 2086 goto fatal_err; 2087 } 2088 2089 if (CBS_len(&cbs) != 0) { 2090 al = SSL_AD_DECODE_ERROR; 2091 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2092 goto fatal_err; 2093 } 2094 2095 return (1); 2096 2097 fatal_err: 2098 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2099 err: 2100 return (-1); 2101 } 2102 2103 int 2104 ssl3_get_cert_verify(SSL *s) 2105 { 2106 CBS cbs, signature; 2107 const struct ssl_sigalg *sigalg = NULL; 2108 const EVP_MD *md = NULL; 2109 EVP_PKEY *pkey = NULL; 2110 X509 *peer = NULL; 2111 EVP_MD_CTX mctx; 2112 int al, ok, verify; 2113 const unsigned char *hdata; 2114 size_t hdatalen; 2115 int type = 0; 2116 int ret = 0; 2117 long n; 2118 2119 EVP_MD_CTX_init(&mctx); 2120 2121 n = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 2122 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok); 2123 if (!ok) 2124 return ((int)n); 2125 2126 if (n < 0) 2127 goto err; 2128 2129 CBS_init(&cbs, s->internal->init_msg, n); 2130 2131 if (s->session->peer != NULL) { 2132 peer = s->session->peer; 2133 pkey = X509_get_pubkey(peer); 2134 type = X509_certificate_type(peer, pkey); 2135 } 2136 2137 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 2138 S3I(s)->tmp.reuse_message = 1; 2139 if (peer != NULL) { 2140 al = SSL_AD_UNEXPECTED_MESSAGE; 2141 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 2142 goto fatal_err; 2143 } 2144 ret = 1; 2145 goto end; 2146 } 2147 2148 if (peer == NULL) { 2149 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 2150 al = SSL_AD_UNEXPECTED_MESSAGE; 2151 goto fatal_err; 2152 } 2153 2154 if (!(type & EVP_PKT_SIGN)) { 2155 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 2156 al = SSL_AD_ILLEGAL_PARAMETER; 2157 goto fatal_err; 2158 } 2159 2160 if (S3I(s)->change_cipher_spec) { 2161 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 2162 al = SSL_AD_UNEXPECTED_MESSAGE; 2163 goto fatal_err; 2164 } 2165 2166 if (!SSL_USE_SIGALGS(s)) { 2167 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2168 goto err; 2169 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2170 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2171 al = SSL_AD_DECODE_ERROR; 2172 goto fatal_err; 2173 } 2174 if (CBS_len(&cbs) != 0) { 2175 al = SSL_AD_DECODE_ERROR; 2176 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2177 goto fatal_err; 2178 } 2179 } 2180 2181 if (SSL_USE_SIGALGS(s)) { 2182 EVP_PKEY_CTX *pctx; 2183 uint16_t sigalg_value; 2184 2185 if (!CBS_get_u16(&cbs, &sigalg_value)) 2186 goto decode_err; 2187 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 2188 tls12_sigalgs_len)) == NULL || 2189 (md = sigalg->md()) == NULL) { 2190 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2191 al = SSL_AD_DECODE_ERROR; 2192 goto fatal_err; 2193 } 2194 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 2195 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 2196 al = SSL_AD_DECODE_ERROR; 2197 goto fatal_err; 2198 } 2199 2200 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2201 goto err; 2202 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2203 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2204 al = SSL_AD_DECODE_ERROR; 2205 goto fatal_err; 2206 } 2207 if (CBS_len(&cbs) != 0) { 2208 al = SSL_AD_DECODE_ERROR; 2209 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2210 goto fatal_err; 2211 } 2212 2213 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2214 SSLerror(s, ERR_R_INTERNAL_ERROR); 2215 al = SSL_AD_INTERNAL_ERROR; 2216 goto fatal_err; 2217 } 2218 if (!EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, pkey)) { 2219 SSLerror(s, ERR_R_EVP_LIB); 2220 al = SSL_AD_INTERNAL_ERROR; 2221 goto fatal_err; 2222 } 2223 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2224 (!EVP_PKEY_CTX_set_rsa_padding 2225 (pctx, RSA_PKCS1_PSS_PADDING) || 2226 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2227 al = SSL_AD_INTERNAL_ERROR; 2228 goto fatal_err; 2229 } 2230 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2231 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2232 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, 2233 NULL) <= 0) { 2234 al = SSL_AD_INTERNAL_ERROR; 2235 goto fatal_err; 2236 } 2237 if (!EVP_DigestVerifyUpdate(&mctx, hdata, hdatalen)) { 2238 SSLerror(s, ERR_R_EVP_LIB); 2239 al = SSL_AD_INTERNAL_ERROR; 2240 goto fatal_err; 2241 } 2242 if (EVP_DigestVerifyFinal(&mctx, CBS_data(&signature), 2243 CBS_len(&signature)) <= 0) { 2244 al = SSL_AD_DECRYPT_ERROR; 2245 SSLerror(s, SSL_R_BAD_SIGNATURE); 2246 goto fatal_err; 2247 } 2248 } else if (pkey->type == EVP_PKEY_RSA) { 2249 verify = RSA_verify(NID_md5_sha1, S3I(s)->tmp.cert_verify_md, 2250 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), 2251 CBS_len(&signature), pkey->pkey.rsa); 2252 if (verify < 0) { 2253 al = SSL_AD_DECRYPT_ERROR; 2254 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2255 goto fatal_err; 2256 } 2257 if (verify == 0) { 2258 al = SSL_AD_DECRYPT_ERROR; 2259 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2260 goto fatal_err; 2261 } 2262 } else if (pkey->type == EVP_PKEY_EC) { 2263 verify = ECDSA_verify(pkey->save_type, 2264 &(S3I(s)->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), 2265 SHA_DIGEST_LENGTH, CBS_data(&signature), 2266 CBS_len(&signature), pkey->pkey.ec); 2267 if (verify <= 0) { 2268 al = SSL_AD_DECRYPT_ERROR; 2269 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2270 goto fatal_err; 2271 } 2272 #ifndef OPENSSL_NO_GOST 2273 } else if (pkey->type == NID_id_GostR3410_94 || 2274 pkey->type == NID_id_GostR3410_2001) { 2275 unsigned char sigbuf[128]; 2276 unsigned int siglen = sizeof(sigbuf); 2277 EVP_PKEY_CTX *pctx; 2278 int nid; 2279 2280 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2281 SSLerror(s, ERR_R_INTERNAL_ERROR); 2282 al = SSL_AD_INTERNAL_ERROR; 2283 goto fatal_err; 2284 } 2285 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2286 !(md = EVP_get_digestbynid(nid))) { 2287 SSLerror(s, ERR_R_EVP_LIB); 2288 al = SSL_AD_INTERNAL_ERROR; 2289 goto fatal_err; 2290 } 2291 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 2292 SSLerror(s, ERR_R_EVP_LIB); 2293 al = SSL_AD_INTERNAL_ERROR; 2294 goto fatal_err; 2295 } 2296 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2297 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2298 !EVP_DigestFinal(&mctx, sigbuf, &siglen) || 2299 (EVP_PKEY_verify_init(pctx) <= 0) || 2300 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2301 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2302 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2303 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { 2304 SSLerror(s, ERR_R_EVP_LIB); 2305 al = SSL_AD_INTERNAL_ERROR; 2306 EVP_PKEY_CTX_free(pctx); 2307 goto fatal_err; 2308 } 2309 if (EVP_PKEY_verify(pctx, CBS_data(&signature), 2310 CBS_len(&signature), sigbuf, siglen) <= 0) { 2311 al = SSL_AD_DECRYPT_ERROR; 2312 SSLerror(s, SSL_R_BAD_SIGNATURE); 2313 EVP_PKEY_CTX_free(pctx); 2314 goto fatal_err; 2315 } 2316 2317 EVP_PKEY_CTX_free(pctx); 2318 #endif 2319 } else { 2320 SSLerror(s, ERR_R_INTERNAL_ERROR); 2321 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2322 goto fatal_err; 2323 } 2324 2325 ret = 1; 2326 if (0) { 2327 decode_err: 2328 al = SSL_AD_DECODE_ERROR; 2329 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2330 fatal_err: 2331 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2332 } 2333 end: 2334 tls1_transcript_free(s); 2335 err: 2336 EVP_MD_CTX_cleanup(&mctx); 2337 EVP_PKEY_free(pkey); 2338 return (ret); 2339 } 2340 2341 int 2342 ssl3_get_client_certificate(SSL *s) 2343 { 2344 CBS cbs, client_certs; 2345 int i, ok, al, ret = -1; 2346 X509 *x = NULL; 2347 long n; 2348 const unsigned char *q; 2349 STACK_OF(X509) *sk = NULL; 2350 2351 n = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2352 -1, s->internal->max_cert_list, &ok); 2353 if (!ok) 2354 return ((int)n); 2355 2356 if (S3I(s)->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2357 if ((s->verify_mode & SSL_VERIFY_PEER) && 2358 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2359 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2360 al = SSL_AD_HANDSHAKE_FAILURE; 2361 goto fatal_err; 2362 } 2363 /* 2364 * If tls asked for a client cert, 2365 * the client must return a 0 list. 2366 */ 2367 if (S3I(s)->tmp.cert_request) { 2368 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 2369 ); 2370 al = SSL_AD_UNEXPECTED_MESSAGE; 2371 goto fatal_err; 2372 } 2373 S3I(s)->tmp.reuse_message = 1; 2374 return (1); 2375 } 2376 2377 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 2378 al = SSL_AD_UNEXPECTED_MESSAGE; 2379 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2380 goto fatal_err; 2381 } 2382 2383 if (n < 0) 2384 goto decode_err; 2385 2386 CBS_init(&cbs, s->internal->init_msg, n); 2387 2388 if ((sk = sk_X509_new_null()) == NULL) { 2389 SSLerror(s, ERR_R_MALLOC_FAILURE); 2390 goto err; 2391 } 2392 2393 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) || 2394 CBS_len(&cbs) != 0) 2395 goto decode_err; 2396 2397 while (CBS_len(&client_certs) > 0) { 2398 CBS cert; 2399 2400 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) { 2401 al = SSL_AD_DECODE_ERROR; 2402 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2403 goto fatal_err; 2404 } 2405 2406 q = CBS_data(&cert); 2407 x = d2i_X509(NULL, &q, CBS_len(&cert)); 2408 if (x == NULL) { 2409 SSLerror(s, ERR_R_ASN1_LIB); 2410 goto err; 2411 } 2412 if (q != CBS_data(&cert) + CBS_len(&cert)) { 2413 al = SSL_AD_DECODE_ERROR; 2414 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2415 goto fatal_err; 2416 } 2417 if (!sk_X509_push(sk, x)) { 2418 SSLerror(s, ERR_R_MALLOC_FAILURE); 2419 goto err; 2420 } 2421 x = NULL; 2422 } 2423 2424 if (sk_X509_num(sk) <= 0) { 2425 /* 2426 * TLS does not mind 0 certs returned. 2427 * Fail for TLS only if we required a certificate. 2428 */ 2429 if ((s->verify_mode & SSL_VERIFY_PEER) && 2430 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2431 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2432 al = SSL_AD_HANDSHAKE_FAILURE; 2433 goto fatal_err; 2434 } 2435 /* No client certificate so free transcript. */ 2436 tls1_transcript_free(s); 2437 } else { 2438 i = ssl_verify_cert_chain(s, sk); 2439 if (i <= 0) { 2440 al = ssl_verify_alarm_type(s->verify_result); 2441 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2442 goto fatal_err; 2443 } 2444 } 2445 2446 X509_free(s->session->peer); 2447 s->session->peer = sk_X509_shift(sk); 2448 s->session->verify_result = s->verify_result; 2449 2450 /* 2451 * With the current implementation, sess_cert will always be NULL 2452 * when we arrive here 2453 */ 2454 if (SSI(s)->sess_cert == NULL) { 2455 SSI(s)->sess_cert = ssl_sess_cert_new(); 2456 if (SSI(s)->sess_cert == NULL) { 2457 SSLerror(s, ERR_R_MALLOC_FAILURE); 2458 goto err; 2459 } 2460 } 2461 sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free); 2462 SSI(s)->sess_cert->cert_chain = sk; 2463 2464 /* 2465 * Inconsistency alert: cert_chain does *not* include the 2466 * peer's own certificate, while we do include it in s3_clnt.c 2467 */ 2468 2469 sk = NULL; 2470 2471 ret = 1; 2472 if (0) { 2473 decode_err: 2474 al = SSL_AD_DECODE_ERROR; 2475 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2476 fatal_err: 2477 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2478 } 2479 err: 2480 X509_free(x); 2481 sk_X509_pop_free(sk, X509_free); 2482 2483 return (ret); 2484 } 2485 2486 int 2487 ssl3_send_server_certificate(SSL *s) 2488 { 2489 CBB cbb, server_cert; 2490 CERT_PKEY *cpk; 2491 2492 /* 2493 * Server Certificate - RFC 5246, section 7.4.2. 2494 */ 2495 2496 memset(&cbb, 0, sizeof(cbb)); 2497 2498 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) { 2499 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { 2500 SSLerror(s, ERR_R_INTERNAL_ERROR); 2501 return (0); 2502 } 2503 2504 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, 2505 SSL3_MT_CERTIFICATE)) 2506 goto err; 2507 if (!ssl3_output_cert_chain(s, &server_cert, cpk)) 2508 goto err; 2509 if (!ssl3_handshake_msg_finish(s, &cbb)) 2510 goto err; 2511 2512 S3I(s)->hs.state = SSL3_ST_SW_CERT_B; 2513 } 2514 2515 /* SSL3_ST_SW_CERT_B */ 2516 return (ssl3_handshake_write(s)); 2517 2518 err: 2519 CBB_cleanup(&cbb); 2520 2521 return (0); 2522 } 2523 2524 /* send a new session ticket (not necessarily for a new session) */ 2525 int 2526 ssl3_send_newsession_ticket(SSL *s) 2527 { 2528 CBB cbb, session_ticket, ticket; 2529 SSL_CTX *tctx = s->initial_ctx; 2530 size_t enc_session_len, enc_session_max_len, hmac_len; 2531 size_t session_len = 0; 2532 unsigned char *enc_session = NULL, *session = NULL; 2533 unsigned char iv[EVP_MAX_IV_LENGTH]; 2534 unsigned char key_name[16]; 2535 unsigned char *hmac; 2536 unsigned int hlen; 2537 EVP_CIPHER_CTX ctx; 2538 HMAC_CTX hctx; 2539 int len; 2540 2541 /* 2542 * New Session Ticket - RFC 5077, section 3.3. 2543 */ 2544 2545 EVP_CIPHER_CTX_init(&ctx); 2546 HMAC_CTX_init(&hctx); 2547 2548 memset(&cbb, 0, sizeof(cbb)); 2549 2550 if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2551 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, 2552 SSL3_MT_NEWSESSION_TICKET)) 2553 goto err; 2554 2555 if (!SSL_SESSION_ticket(s->session, &session, &session_len)) 2556 goto err; 2557 if (session_len > 0xffff) 2558 goto err; 2559 2560 /* 2561 * Initialize HMAC and cipher contexts. If callback is present 2562 * it does all the work, otherwise use generated values from 2563 * parent context. 2564 */ 2565 if (tctx->internal->tlsext_ticket_key_cb != NULL) { 2566 if (tctx->internal->tlsext_ticket_key_cb(s, 2567 key_name, iv, &ctx, &hctx, 1) < 0) { 2568 EVP_CIPHER_CTX_cleanup(&ctx); 2569 goto err; 2570 } 2571 } else { 2572 arc4random_buf(iv, 16); 2573 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 2574 tctx->internal->tlsext_tick_aes_key, iv); 2575 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key, 2576 16, EVP_sha256(), NULL); 2577 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); 2578 } 2579 2580 /* Encrypt the session state. */ 2581 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; 2582 if ((enc_session = calloc(1, enc_session_max_len)) == NULL) 2583 goto err; 2584 enc_session_len = 0; 2585 if (!EVP_EncryptUpdate(&ctx, enc_session, &len, session, 2586 session_len)) 2587 goto err; 2588 enc_session_len += len; 2589 if (!EVP_EncryptFinal_ex(&ctx, enc_session + enc_session_len, 2590 &len)) 2591 goto err; 2592 enc_session_len += len; 2593 2594 if (enc_session_len > enc_session_max_len) 2595 goto err; 2596 2597 /* Generate the HMAC. */ 2598 if (!HMAC_Update(&hctx, key_name, sizeof(key_name))) 2599 goto err; 2600 if (!HMAC_Update(&hctx, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2601 goto err; 2602 if (!HMAC_Update(&hctx, enc_session, enc_session_len)) 2603 goto err; 2604 2605 if ((hmac_len = HMAC_size(&hctx)) <= 0) 2606 goto err; 2607 2608 /* 2609 * Ticket lifetime hint (advisory only): 2610 * We leave this unspecified for resumed session 2611 * (for simplicity), and guess that tickets for new 2612 * sessions will live as long as their sessions. 2613 */ 2614 if (!CBB_add_u32(&session_ticket, 2615 s->internal->hit ? 0 : s->session->timeout)) 2616 goto err; 2617 2618 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) 2619 goto err; 2620 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) 2621 goto err; 2622 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2623 goto err; 2624 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) 2625 goto err; 2626 if (!CBB_add_space(&ticket, &hmac, hmac_len)) 2627 goto err; 2628 2629 if (!HMAC_Final(&hctx, hmac, &hlen)) 2630 goto err; 2631 if (hlen != hmac_len) 2632 goto err; 2633 2634 if (!ssl3_handshake_msg_finish(s, &cbb)) 2635 goto err; 2636 2637 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2638 } 2639 2640 EVP_CIPHER_CTX_cleanup(&ctx); 2641 HMAC_CTX_cleanup(&hctx); 2642 freezero(session, session_len); 2643 free(enc_session); 2644 2645 /* SSL3_ST_SW_SESSION_TICKET_B */ 2646 return (ssl3_handshake_write(s)); 2647 2648 err: 2649 CBB_cleanup(&cbb); 2650 EVP_CIPHER_CTX_cleanup(&ctx); 2651 HMAC_CTX_cleanup(&hctx); 2652 freezero(session, session_len); 2653 free(enc_session); 2654 2655 return (-1); 2656 } 2657 2658 int 2659 ssl3_send_cert_status(SSL *s) 2660 { 2661 CBB cbb, certstatus, ocspresp; 2662 2663 memset(&cbb, 0, sizeof(cbb)); 2664 2665 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2666 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, 2667 SSL3_MT_CERTIFICATE_STATUS)) 2668 goto err; 2669 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2670 goto err; 2671 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2672 goto err; 2673 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, 2674 s->internal->tlsext_ocsp_resp_len)) 2675 goto err; 2676 if (!ssl3_handshake_msg_finish(s, &cbb)) 2677 goto err; 2678 2679 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2680 } 2681 2682 /* SSL3_ST_SW_CERT_STATUS_B */ 2683 return (ssl3_handshake_write(s)); 2684 2685 err: 2686 CBB_cleanup(&cbb); 2687 2688 return (-1); 2689 } 2690