1 /* $OpenBSD: ssl_srvr.c,v 1.26 2017/10/12 15:52:50 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_tlsext.h" 170 171 int 172 ssl3_accept(SSL *s) 173 { 174 void (*cb)(const SSL *ssl, int type, int val) = NULL; 175 unsigned long alg_k; 176 int ret = -1; 177 int new_state, state, skip = 0; 178 int listen; 179 180 ERR_clear_error(); 181 errno = 0; 182 183 if (s->internal->info_callback != NULL) 184 cb = s->internal->info_callback; 185 else if (s->ctx->internal->info_callback != NULL) 186 cb = s->ctx->internal->info_callback; 187 188 if (SSL_IS_DTLS(s)) 189 listen = D1I(s)->listen; 190 191 /* init things to blank */ 192 s->internal->in_handshake++; 193 if (!SSL_in_init(s) || SSL_in_before(s)) 194 SSL_clear(s); 195 196 if (SSL_IS_DTLS(s)) 197 D1I(s)->listen = listen; 198 199 if (s->cert == NULL) { 200 SSLerror(s, SSL_R_NO_CERTIFICATE_SET); 201 ret = -1; 202 goto end; 203 } 204 205 for (;;) { 206 state = S3I(s)->hs.state; 207 208 switch (S3I(s)->hs.state) { 209 case SSL_ST_RENEGOTIATE: 210 s->internal->renegotiate = 1; 211 /* S3I(s)->hs.state=SSL_ST_ACCEPT; */ 212 213 case SSL_ST_BEFORE: 214 case SSL_ST_ACCEPT: 215 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 216 case SSL_ST_OK|SSL_ST_ACCEPT: 217 s->server = 1; 218 if (cb != NULL) 219 cb(s, SSL_CB_HANDSHAKE_START, 1); 220 221 if (SSL_IS_DTLS(s)) { 222 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { 223 SSLerror(s, ERR_R_INTERNAL_ERROR); 224 ret = -1; 225 goto end; 226 } 227 } else { 228 if ((s->version >> 8) != 3) { 229 SSLerror(s, ERR_R_INTERNAL_ERROR); 230 ret = -1; 231 goto end; 232 } 233 } 234 s->internal->type = SSL_ST_ACCEPT; 235 236 if (!ssl3_setup_init_buffer(s)) { 237 ret = -1; 238 goto end; 239 } 240 if (!ssl3_setup_buffers(s)) { 241 ret = -1; 242 goto end; 243 } 244 245 s->internal->init_num = 0; 246 247 if (S3I(s)->hs.state != SSL_ST_RENEGOTIATE) { 248 /* 249 * Ok, we now need to push on a buffering BIO 250 * so that the output is sent in a way that 251 * TCP likes :-) 252 */ 253 if (!ssl_init_wbio_buffer(s, 1)) { 254 ret = -1; 255 goto end; 256 } 257 if (!tls1_init_finished_mac(s)) { 258 ret = -1; 259 goto end; 260 } 261 262 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_A; 263 s->ctx->internal->stats.sess_accept++; 264 } else if (!SSL_IS_DTLS(s) && !S3I(s)->send_connection_binding) { 265 /* 266 * Server attempting to renegotiate with 267 * client that doesn't support secure 268 * renegotiation. 269 */ 270 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 271 ssl3_send_alert(s, SSL3_AL_FATAL, 272 SSL_AD_HANDSHAKE_FAILURE); 273 ret = -1; 274 goto end; 275 } else { 276 /* 277 * S3I(s)->hs.state == SSL_ST_RENEGOTIATE, 278 * we will just send a HelloRequest. 279 */ 280 s->ctx->internal->stats.sess_accept_renegotiate++; 281 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_A; 282 } 283 break; 284 285 case SSL3_ST_SW_HELLO_REQ_A: 286 case SSL3_ST_SW_HELLO_REQ_B: 287 s->internal->shutdown = 0; 288 if (SSL_IS_DTLS(s)) { 289 dtls1_clear_record_buffer(s); 290 dtls1_start_timer(s); 291 } 292 ret = ssl3_send_hello_request(s); 293 if (ret <= 0) 294 goto end; 295 if (SSL_IS_DTLS(s)) 296 S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A; 297 else 298 S3I(s)->hs.next_state = SSL3_ST_SW_HELLO_REQ_C; 299 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 300 s->internal->init_num = 0; 301 302 if (!tls1_init_finished_mac(s)) { 303 ret = -1; 304 goto end; 305 } 306 break; 307 308 case SSL3_ST_SW_HELLO_REQ_C: 309 S3I(s)->hs.state = SSL_ST_OK; 310 break; 311 312 case SSL3_ST_SR_CLNT_HELLO_A: 313 case SSL3_ST_SR_CLNT_HELLO_B: 314 case SSL3_ST_SR_CLNT_HELLO_C: 315 s->internal->shutdown = 0; 316 if (SSL_IS_DTLS(s)) { 317 ret = ssl3_get_client_hello(s); 318 if (ret <= 0) 319 goto end; 320 dtls1_stop_timer(s); 321 322 if (ret == 1 && 323 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 324 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 325 else 326 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 327 328 s->internal->init_num = 0; 329 330 /* 331 * Reflect ClientHello sequence to remain 332 * stateless while listening. 333 */ 334 if (listen) { 335 memcpy(S3I(s)->write_sequence, 336 S3I(s)->read_sequence, 337 sizeof(S3I(s)->write_sequence)); 338 } 339 340 /* If we're just listening, stop here */ 341 if (listen && S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 342 ret = 2; 343 D1I(s)->listen = 0; 344 /* 345 * Set expected sequence numbers to 346 * continue the handshake. 347 */ 348 D1I(s)->handshake_read_seq = 2; 349 D1I(s)->handshake_write_seq = 1; 350 D1I(s)->next_handshake_write_seq = 1; 351 goto end; 352 } 353 } else { 354 if (s->internal->rwstate != SSL_X509_LOOKUP) { 355 ret = ssl3_get_client_hello(s); 356 if (ret <= 0) 357 goto end; 358 } 359 360 s->internal->renegotiate = 2; 361 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 362 s->internal->init_num = 0; 363 } 364 break; 365 366 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 367 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 368 ret = dtls1_send_hello_verify_request(s); 369 if (ret <= 0) 370 goto end; 371 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 372 S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A; 373 374 /* HelloVerifyRequest resets Finished MAC. */ 375 if (!tls1_init_finished_mac(s)) { 376 ret = -1; 377 goto end; 378 } 379 break; 380 381 case SSL3_ST_SW_SRVR_HELLO_A: 382 case SSL3_ST_SW_SRVR_HELLO_B: 383 if (SSL_IS_DTLS(s)) { 384 s->internal->renegotiate = 2; 385 dtls1_start_timer(s); 386 } 387 ret = ssl3_send_server_hello(s); 388 if (ret <= 0) 389 goto end; 390 if (s->internal->hit) { 391 if (s->internal->tlsext_ticket_expected) 392 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 393 else 394 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 395 } else { 396 S3I(s)->hs.state = SSL3_ST_SW_CERT_A; 397 } 398 s->internal->init_num = 0; 399 break; 400 401 case SSL3_ST_SW_CERT_A: 402 case SSL3_ST_SW_CERT_B: 403 /* Check if it is anon DH or anon ECDH. */ 404 if (!(S3I(s)->hs.new_cipher->algorithm_auth & 405 SSL_aNULL)) { 406 if (SSL_IS_DTLS(s)) 407 dtls1_start_timer(s); 408 ret = ssl3_send_server_certificate(s); 409 if (ret <= 0) 410 goto end; 411 if (s->internal->tlsext_status_expected) 412 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_A; 413 else 414 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 415 } else { 416 skip = 1; 417 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 418 } 419 s->internal->init_num = 0; 420 break; 421 422 case SSL3_ST_SW_KEY_EXCH_A: 423 case SSL3_ST_SW_KEY_EXCH_B: 424 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 425 426 /* 427 * Only send if using a DH key exchange. 428 * 429 * For ECC ciphersuites, we send a ServerKeyExchange 430 * message only if the cipher suite is ECDHE. In other 431 * cases, the server certificate contains the server's 432 * public key for key exchange. 433 */ 434 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 435 if (SSL_IS_DTLS(s)) 436 dtls1_start_timer(s); 437 ret = ssl3_send_server_key_exchange(s); 438 if (ret <= 0) 439 goto end; 440 } else 441 skip = 1; 442 443 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_A; 444 s->internal->init_num = 0; 445 break; 446 447 case SSL3_ST_SW_CERT_REQ_A: 448 case SSL3_ST_SW_CERT_REQ_B: 449 /* 450 * Determine whether or not we need to request a 451 * certificate. 452 * 453 * Do not request a certificate if: 454 * 455 * - We did not ask for it (SSL_VERIFY_PEER is unset). 456 * 457 * - SSL_VERIFY_CLIENT_ONCE is set and we are 458 * renegotiating. 459 * 460 * - We are using an anonymous ciphersuites 461 * (see section "Certificate request" in SSL 3 drafts 462 * and in RFC 2246) ... except when the application 463 * insists on verification (against the specs, but 464 * s3_clnt.c accepts this for SSL 3). 465 */ 466 if (!(s->verify_mode & SSL_VERIFY_PEER) || 467 ((s->session->peer != NULL) && 468 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 469 ((S3I(s)->hs.new_cipher->algorithm_auth & 470 SSL_aNULL) && !(s->verify_mode & 471 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) { 472 /* No cert request. */ 473 skip = 1; 474 S3I(s)->tmp.cert_request = 0; 475 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; 476 if (!SSL_IS_DTLS(s) && S3I(s)->handshake_buffer) { 477 if (!tls1_digest_cached_records(s)) { 478 ret = -1; 479 goto end; 480 } 481 } 482 } else { 483 S3I(s)->tmp.cert_request = 1; 484 if (SSL_IS_DTLS(s)) 485 dtls1_start_timer(s); 486 ret = ssl3_send_certificate_request(s); 487 if (ret <= 0) 488 goto end; 489 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; 490 s->internal->init_num = 0; 491 } 492 break; 493 494 case SSL3_ST_SW_SRVR_DONE_A: 495 case SSL3_ST_SW_SRVR_DONE_B: 496 if (SSL_IS_DTLS(s)) 497 dtls1_start_timer(s); 498 ret = ssl3_send_server_done(s); 499 if (ret <= 0) 500 goto end; 501 S3I(s)->hs.next_state = SSL3_ST_SR_CERT_A; 502 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 503 s->internal->init_num = 0; 504 break; 505 506 case SSL3_ST_SW_FLUSH: 507 /* 508 * This code originally checked to see if 509 * any data was pending using BIO_CTRL_INFO 510 * and then flushed. This caused problems 511 * as documented in PR#1939. The proposed 512 * fix doesn't completely resolve this issue 513 * as buggy implementations of BIO_CTRL_PENDING 514 * still exist. So instead we just flush 515 * unconditionally. 516 */ 517 s->internal->rwstate = SSL_WRITING; 518 if (BIO_flush(s->wbio) <= 0) { 519 if (SSL_IS_DTLS(s)) { 520 /* If the write error was fatal, stop trying. */ 521 if (!BIO_should_retry(s->wbio)) { 522 s->internal->rwstate = SSL_NOTHING; 523 S3I(s)->hs.state = S3I(s)->hs.next_state; 524 } 525 } 526 ret = -1; 527 goto end; 528 } 529 s->internal->rwstate = SSL_NOTHING; 530 S3I(s)->hs.state = S3I(s)->hs.next_state; 531 break; 532 533 case SSL3_ST_SR_CERT_A: 534 case SSL3_ST_SR_CERT_B: 535 if (S3I(s)->tmp.cert_request) { 536 ret = ssl3_get_client_certificate(s); 537 if (ret <= 0) 538 goto end; 539 } 540 s->internal->init_num = 0; 541 S3I(s)->hs.state = SSL3_ST_SR_KEY_EXCH_A; 542 break; 543 544 case SSL3_ST_SR_KEY_EXCH_A: 545 case SSL3_ST_SR_KEY_EXCH_B: 546 ret = ssl3_get_client_key_exchange(s); 547 if (ret <= 0) 548 goto end; 549 550 if (SSL_IS_DTLS(s)) { 551 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 552 s->internal->init_num = 0; 553 } 554 555 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 556 if (ret == 2) { 557 /* 558 * For the ECDH ciphersuites when 559 * the client sends its ECDH pub key in 560 * a certificate, the CertificateVerify 561 * message is not sent. 562 * Also for GOST ciphersuites when 563 * the client uses its key from the certificate 564 * for key exchange. 565 */ 566 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; 567 s->internal->init_num = 0; 568 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) { 569 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 570 s->internal->init_num = 0; 571 if (!s->session->peer) 572 break; 573 /* 574 * For sigalgs freeze the handshake buffer 575 * at this point and digest cached records. 576 */ 577 if (!S3I(s)->handshake_buffer) { 578 SSLerror(s, ERR_R_INTERNAL_ERROR); 579 ret = -1; 580 goto end; 581 } 582 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE; 583 if (!tls1_digest_cached_records(s)) { 584 ret = -1; 585 goto end; 586 } 587 } else { 588 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 589 s->internal->init_num = 0; 590 591 /* 592 * We need to get hashes here so if there is 593 * a client cert, it can be verified. 594 */ 595 if (S3I(s)->handshake_buffer) { 596 if (!tls1_digest_cached_records(s)) { 597 ret = -1; 598 goto end; 599 } 600 } 601 if (!tls1_handshake_hash_value(s, 602 S3I(s)->tmp.cert_verify_md, 603 sizeof(S3I(s)->tmp.cert_verify_md), 604 NULL)) { 605 ret = -1; 606 goto end; 607 } 608 } 609 break; 610 611 case SSL3_ST_SR_CERT_VRFY_A: 612 case SSL3_ST_SR_CERT_VRFY_B: 613 if (SSL_IS_DTLS(s)) 614 D1I(s)->change_cipher_spec_ok = 1; 615 else 616 s->s3->flags |= SSL3_FLAGS_CCS_OK; 617 618 /* we should decide if we expected this one */ 619 ret = ssl3_get_cert_verify(s); 620 if (ret <= 0) 621 goto end; 622 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; 623 s->internal->init_num = 0; 624 break; 625 626 case SSL3_ST_SR_FINISHED_A: 627 case SSL3_ST_SR_FINISHED_B: 628 if (SSL_IS_DTLS(s)) 629 D1I(s)->change_cipher_spec_ok = 1; 630 else 631 s->s3->flags |= SSL3_FLAGS_CCS_OK; 632 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 633 SSL3_ST_SR_FINISHED_B); 634 if (ret <= 0) 635 goto end; 636 if (SSL_IS_DTLS(s)) 637 dtls1_stop_timer(s); 638 if (s->internal->hit) 639 S3I(s)->hs.state = SSL_ST_OK; 640 else if (s->internal->tlsext_ticket_expected) 641 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 642 else 643 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 644 s->internal->init_num = 0; 645 break; 646 647 case SSL3_ST_SW_SESSION_TICKET_A: 648 case SSL3_ST_SW_SESSION_TICKET_B: 649 ret = ssl3_send_newsession_ticket(s); 650 if (ret <= 0) 651 goto end; 652 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 653 s->internal->init_num = 0; 654 break; 655 656 case SSL3_ST_SW_CERT_STATUS_A: 657 case SSL3_ST_SW_CERT_STATUS_B: 658 ret = ssl3_send_cert_status(s); 659 if (ret <= 0) 660 goto end; 661 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 662 s->internal->init_num = 0; 663 break; 664 665 case SSL3_ST_SW_CHANGE_A: 666 case SSL3_ST_SW_CHANGE_B: 667 s->session->cipher = S3I(s)->hs.new_cipher; 668 if (!tls1_setup_key_block(s)) { 669 ret = -1; 670 goto end; 671 } 672 673 ret = ssl3_send_change_cipher_spec(s, 674 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B); 675 if (ret <= 0) 676 goto end; 677 S3I(s)->hs.state = SSL3_ST_SW_FINISHED_A; 678 s->internal->init_num = 0; 679 680 if (!tls1_change_cipher_state(s, 681 SSL3_CHANGE_CIPHER_SERVER_WRITE)) { 682 ret = -1; 683 goto end; 684 } 685 686 if (SSL_IS_DTLS(s)) 687 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 688 break; 689 690 case SSL3_ST_SW_FINISHED_A: 691 case SSL3_ST_SW_FINISHED_B: 692 ret = ssl3_send_finished(s, 693 SSL3_ST_SW_FINISHED_A, SSL3_ST_SW_FINISHED_B, 694 TLS_MD_SERVER_FINISH_CONST, 695 TLS_MD_SERVER_FINISH_CONST_SIZE); 696 if (ret <= 0) 697 goto end; 698 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 699 if (s->internal->hit) 700 S3I(s)->hs.next_state = SSL3_ST_SR_FINISHED_A; 701 else 702 S3I(s)->hs.next_state = SSL_ST_OK; 703 s->internal->init_num = 0; 704 break; 705 706 case SSL_ST_OK: 707 /* clean a few things up */ 708 tls1_cleanup_key_block(s); 709 710 if (!SSL_IS_DTLS(s)) { 711 BUF_MEM_free(s->internal->init_buf); 712 s->internal->init_buf = NULL; 713 } 714 715 /* remove buffering on output */ 716 ssl_free_wbio_buffer(s); 717 718 s->internal->init_num = 0; 719 720 /* Skipped if we just sent a HelloRequest. */ 721 if (s->internal->renegotiate == 2) { 722 s->internal->renegotiate = 0; 723 s->internal->new_session = 0; 724 725 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 726 727 s->ctx->internal->stats.sess_accept_good++; 728 /* s->server=1; */ 729 s->internal->handshake_func = ssl3_accept; 730 731 if (cb != NULL) 732 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 733 } 734 735 ret = 1; 736 737 if (SSL_IS_DTLS(s)) { 738 /* Done handshaking, next message is client hello. */ 739 D1I(s)->handshake_read_seq = 0; 740 /* Next message is server hello. */ 741 D1I(s)->handshake_write_seq = 0; 742 D1I(s)->next_handshake_write_seq = 0; 743 } 744 goto end; 745 /* break; */ 746 747 default: 748 SSLerror(s, SSL_R_UNKNOWN_STATE); 749 ret = -1; 750 goto end; 751 /* break; */ 752 } 753 754 if (!S3I(s)->tmp.reuse_message && !skip) { 755 if (s->internal->debug) { 756 if ((ret = BIO_flush(s->wbio)) <= 0) 757 goto end; 758 } 759 760 761 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 762 new_state = S3I(s)->hs.state; 763 S3I(s)->hs.state = state; 764 cb(s, SSL_CB_ACCEPT_LOOP, 1); 765 S3I(s)->hs.state = new_state; 766 } 767 } 768 skip = 0; 769 } 770 end: 771 /* BIO_flush(s->wbio); */ 772 s->internal->in_handshake--; 773 if (cb != NULL) 774 cb(s, SSL_CB_ACCEPT_EXIT, ret); 775 776 return (ret); 777 } 778 779 int 780 ssl3_send_hello_request(SSL *s) 781 { 782 CBB cbb, hello; 783 784 memset(&cbb, 0, sizeof(cbb)); 785 786 if (S3I(s)->hs.state == SSL3_ST_SW_HELLO_REQ_A) { 787 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &hello, 788 SSL3_MT_HELLO_REQUEST)) 789 goto err; 790 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 791 goto err; 792 793 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_B; 794 } 795 796 /* SSL3_ST_SW_HELLO_REQ_B */ 797 return (ssl3_handshake_write(s)); 798 799 err: 800 CBB_cleanup(&cbb); 801 802 return (-1); 803 } 804 805 int 806 ssl3_get_client_hello(SSL *s) 807 { 808 CBS cbs, client_random, session_id, cookie, cipher_suites; 809 CBS compression_methods; 810 uint16_t client_version; 811 uint8_t comp_method; 812 int comp_null; 813 int i, j, ok, al, ret = -1, cookie_valid = 0; 814 long n; 815 unsigned long id; 816 unsigned char *p, *d; 817 SSL_CIPHER *c; 818 STACK_OF(SSL_CIPHER) *ciphers = NULL; 819 unsigned long alg_k; 820 const SSL_METHOD *method; 821 uint16_t shared_version; 822 unsigned char *end; 823 824 /* 825 * We do this so that we will respond with our native type. 826 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, 827 * This down switching should be handled by a different method. 828 * If we are SSLv3, we will respond with SSLv3, even if prompted with 829 * TLSv1. 830 */ 831 if (S3I(s)->hs.state == SSL3_ST_SR_CLNT_HELLO_A) { 832 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_B; 833 } 834 835 s->internal->first_packet = 1; 836 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, 837 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, 838 SSL3_RT_MAX_PLAIN_LENGTH, &ok); 839 if (!ok) 840 return ((int)n); 841 s->internal->first_packet = 0; 842 843 if (n < 0) 844 goto err; 845 846 d = p = (unsigned char *)s->internal->init_msg; 847 end = d + n; 848 849 CBS_init(&cbs, s->internal->init_msg, n); 850 851 /* 852 * Use version from inside client hello, not from record header. 853 * (may differ: see RFC 2246, Appendix E, second paragraph) 854 */ 855 if (!CBS_get_u16(&cbs, &client_version)) 856 goto truncated; 857 858 if (ssl_max_shared_version(s, client_version, &shared_version) != 1) { 859 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER); 860 if ((s->client_version >> 8) == SSL3_VERSION_MAJOR && 861 !s->internal->enc_write_ctx && !s->internal->write_hash) { 862 /* 863 * Similar to ssl3_get_record, send alert using remote 864 * version number. 865 */ 866 s->version = s->client_version; 867 } 868 al = SSL_AD_PROTOCOL_VERSION; 869 goto f_err; 870 } 871 s->client_version = client_version; 872 s->version = shared_version; 873 874 if ((method = tls1_get_server_method(shared_version)) == NULL) 875 method = dtls1_get_server_method(shared_version); 876 if (method == NULL) { 877 SSLerror(s, ERR_R_INTERNAL_ERROR); 878 goto err; 879 } 880 s->method = method; 881 882 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE)) 883 goto truncated; 884 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 885 goto truncated; 886 887 /* 888 * If we require cookies (DTLS) and this ClientHello doesn't 889 * contain one, just return since we do not want to 890 * allocate any memory yet. So check cookie length... 891 */ 892 if (SSL_IS_DTLS(s)) { 893 if (!CBS_get_u8_length_prefixed(&cbs, &cookie)) 894 goto truncated; 895 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 896 if (CBS_len(&cookie) == 0) 897 return (1); 898 } 899 } 900 901 if (!CBS_write_bytes(&client_random, s->s3->client_random, 902 sizeof(s->s3->client_random), NULL)) 903 goto err; 904 905 s->internal->hit = 0; 906 907 /* 908 * Versions before 0.9.7 always allow clients to resume sessions in 909 * renegotiation. 0.9.7 and later allow this by default, but optionally 910 * ignore resumption requests with flag 911 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag 912 * rather than a change to default behavior so that applications 913 * relying on this for security won't even compile against older 914 * library versions). 915 * 916 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() 917 * to request renegotiation but not a new session (s->internal->new_session 918 * remains unset): for servers, this essentially just means that the 919 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be 920 * ignored. 921 */ 922 if ((s->internal->new_session && (s->internal->options & 923 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { 924 if (!ssl_get_new_session(s, 1)) 925 goto err; 926 } else { 927 /* XXX - pass CBS through instead... */ 928 i = ssl_get_prev_session(s, 929 (unsigned char *)CBS_data(&session_id), 930 CBS_len(&session_id), end); 931 if (i == 1) { /* previous session */ 932 s->internal->hit = 1; 933 } else if (i == -1) 934 goto err; 935 else { 936 /* i == 0 */ 937 if (!ssl_get_new_session(s, 1)) 938 goto err; 939 } 940 } 941 942 if (SSL_IS_DTLS(s)) { 943 /* 944 * The ClientHello may contain a cookie even if the HelloVerify 945 * message has not been sent - make sure that it does not cause 946 * an overflow. 947 */ 948 if (CBS_len(&cookie) > sizeof(D1I(s)->rcvd_cookie)) { 949 al = SSL_AD_DECODE_ERROR; 950 SSLerror(s, SSL_R_COOKIE_MISMATCH); 951 goto f_err; 952 } 953 954 /* Verify the cookie if appropriate option is set. */ 955 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && 956 CBS_len(&cookie) > 0) { 957 size_t cookie_len; 958 959 /* XXX - rcvd_cookie seems to only be used here... */ 960 if (!CBS_write_bytes(&cookie, D1I(s)->rcvd_cookie, 961 sizeof(D1I(s)->rcvd_cookie), &cookie_len)) 962 goto err; 963 964 if (s->ctx->internal->app_verify_cookie_cb != NULL) { 965 if (s->ctx->internal->app_verify_cookie_cb(s, 966 D1I(s)->rcvd_cookie, cookie_len) == 0) { 967 al = SSL_AD_HANDSHAKE_FAILURE; 968 SSLerror(s, SSL_R_COOKIE_MISMATCH); 969 goto f_err; 970 } 971 /* else cookie verification succeeded */ 972 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */ 973 } else if (timingsafe_memcmp(D1I(s)->rcvd_cookie, 974 D1I(s)->cookie, D1I(s)->cookie_len) != 0) { 975 /* default verification */ 976 al = SSL_AD_HANDSHAKE_FAILURE; 977 SSLerror(s, SSL_R_COOKIE_MISMATCH); 978 goto f_err; 979 } 980 cookie_valid = 1; 981 } 982 } 983 984 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites)) 985 goto truncated; 986 987 /* XXX - This logic seems wrong... */ 988 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) { 989 /* we need a cipher if we are not resuming a session */ 990 al = SSL_AD_ILLEGAL_PARAMETER; 991 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED); 992 goto f_err; 993 } 994 995 if (CBS_len(&cipher_suites) > 0) { 996 if ((ciphers = ssl_bytes_to_cipher_list(s, 997 &cipher_suites)) == NULL) 998 goto err; 999 } 1000 1001 /* If it is a hit, check that the cipher is in the list */ 1002 /* XXX - CBS_len(&cipher_suites) will always be zero here... */ 1003 if (s->internal->hit && CBS_len(&cipher_suites) > 0) { 1004 j = 0; 1005 id = s->session->cipher->id; 1006 1007 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 1008 c = sk_SSL_CIPHER_value(ciphers, i); 1009 if (c->id == id) { 1010 j = 1; 1011 break; 1012 } 1013 } 1014 if (j == 0) { 1015 /* 1016 * We need to have the cipher in the cipher 1017 * list if we are asked to reuse it 1018 */ 1019 al = SSL_AD_ILLEGAL_PARAMETER; 1020 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING); 1021 goto f_err; 1022 } 1023 } 1024 1025 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods)) 1026 goto truncated; 1027 1028 comp_null = 0; 1029 while (CBS_len(&compression_methods) > 0) { 1030 if (!CBS_get_u8(&compression_methods, &comp_method)) 1031 goto truncated; 1032 if (comp_method == 0) 1033 comp_null = 1; 1034 } 1035 if (comp_null == 0) { 1036 al = SSL_AD_DECODE_ERROR; 1037 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED); 1038 goto f_err; 1039 } 1040 1041 p = (unsigned char *)CBS_data(&cbs); 1042 1043 /* TLS extensions*/ 1044 if (!ssl_parse_clienthello_tlsext(s, &p, d, n, &al)) { 1045 /* 'al' set by ssl_parse_clienthello_tlsext */ 1046 SSLerror(s, SSL_R_PARSE_TLSEXT); 1047 goto f_err; 1048 } 1049 if (ssl_check_clienthello_tlsext_early(s) <= 0) { 1050 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1051 goto err; 1052 } 1053 1054 /* 1055 * Check if we want to use external pre-shared secret for this 1056 * handshake for not reused session only. We need to generate 1057 * server_random before calling tls_session_secret_cb in order to allow 1058 * SessionTicket processing to use it in key derivation. 1059 */ 1060 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE); 1061 1062 if (!s->internal->hit && s->internal->tls_session_secret_cb) { 1063 SSL_CIPHER *pref_cipher = NULL; 1064 1065 s->session->master_key_length = sizeof(s->session->master_key); 1066 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 1067 &s->session->master_key_length, ciphers, &pref_cipher, 1068 s->internal->tls_session_secret_cb_arg)) { 1069 s->internal->hit = 1; 1070 s->session->ciphers = ciphers; 1071 s->session->verify_result = X509_V_OK; 1072 1073 ciphers = NULL; 1074 1075 /* check if some cipher was preferred by call back */ 1076 pref_cipher = pref_cipher ? pref_cipher : 1077 ssl3_choose_cipher(s, s->session->ciphers, 1078 SSL_get_ciphers(s)); 1079 if (pref_cipher == NULL) { 1080 al = SSL_AD_HANDSHAKE_FAILURE; 1081 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1082 goto f_err; 1083 } 1084 1085 s->session->cipher = pref_cipher; 1086 1087 sk_SSL_CIPHER_free(s->cipher_list); 1088 sk_SSL_CIPHER_free(s->internal->cipher_list_by_id); 1089 1090 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); 1091 s->internal->cipher_list_by_id = 1092 sk_SSL_CIPHER_dup(s->session->ciphers); 1093 } 1094 } 1095 1096 /* 1097 * Given s->session->ciphers and SSL_get_ciphers, we must 1098 * pick a cipher 1099 */ 1100 1101 if (!s->internal->hit) { 1102 sk_SSL_CIPHER_free(s->session->ciphers); 1103 s->session->ciphers = ciphers; 1104 if (ciphers == NULL) { 1105 al = SSL_AD_ILLEGAL_PARAMETER; 1106 SSLerror(s, SSL_R_NO_CIPHERS_PASSED); 1107 goto f_err; 1108 } 1109 ciphers = NULL; 1110 c = ssl3_choose_cipher(s, s->session->ciphers, 1111 SSL_get_ciphers(s)); 1112 1113 if (c == NULL) { 1114 al = SSL_AD_HANDSHAKE_FAILURE; 1115 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1116 goto f_err; 1117 } 1118 S3I(s)->hs.new_cipher = c; 1119 } else { 1120 S3I(s)->hs.new_cipher = s->session->cipher; 1121 } 1122 1123 if (!tls1_handshake_hash_init(s)) 1124 goto err; 1125 1126 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1127 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) || 1128 !(s->verify_mode & SSL_VERIFY_PEER)) { 1129 if (!tls1_digest_cached_records(s)) { 1130 al = SSL_AD_INTERNAL_ERROR; 1131 goto f_err; 1132 } 1133 } 1134 1135 /* 1136 * We now have the following setup. 1137 * client_random 1138 * cipher_list - our prefered list of ciphers 1139 * ciphers - the clients prefered list of ciphers 1140 * compression - basically ignored right now 1141 * ssl version is set - sslv3 1142 * s->session - The ssl session has been setup. 1143 * s->internal->hit - session reuse flag 1144 * s->hs.new_cipher - the new cipher to use. 1145 */ 1146 1147 /* Handles TLS extensions that we couldn't check earlier */ 1148 if (ssl_check_clienthello_tlsext_late(s) <= 0) { 1149 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1150 goto err; 1151 } 1152 1153 ret = cookie_valid ? 2 : 1; 1154 1155 if (0) { 1156 truncated: 1157 al = SSL_AD_DECODE_ERROR; 1158 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1159 f_err: 1160 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1161 } 1162 err: 1163 sk_SSL_CIPHER_free(ciphers); 1164 1165 return (ret); 1166 } 1167 1168 int 1169 ssl3_send_server_hello(SSL *s) 1170 { 1171 CBB cbb, server_hello, session_id; 1172 size_t sl; 1173 1174 memset(&cbb, 0, sizeof(cbb)); 1175 1176 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 1177 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &server_hello, 1178 SSL3_MT_SERVER_HELLO)) 1179 goto err; 1180 1181 if (!CBB_add_u16(&server_hello, s->version)) 1182 goto err; 1183 if (!CBB_add_bytes(&server_hello, s->s3->server_random, 1184 sizeof(s->s3->server_random))) 1185 goto err; 1186 1187 /* 1188 * There are several cases for the session ID to send 1189 * back in the server hello: 1190 * 1191 * - For session reuse from the session cache, 1192 * we send back the old session ID. 1193 * - If stateless session reuse (using a session ticket) 1194 * is successful, we send back the client's "session ID" 1195 * (which doesn't actually identify the session). 1196 * - If it is a new session, we send back the new 1197 * session ID. 1198 * - However, if we want the new session to be single-use, 1199 * we send back a 0-length session ID. 1200 * 1201 * s->internal->hit is non-zero in either case of session reuse, 1202 * so the following won't overwrite an ID that we're supposed 1203 * to send back. 1204 */ 1205 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER) 1206 && !s->internal->hit) 1207 s->session->session_id_length = 0; 1208 1209 sl = s->session->session_id_length; 1210 if (sl > sizeof(s->session->session_id)) { 1211 SSLerror(s, ERR_R_INTERNAL_ERROR); 1212 goto err; 1213 } 1214 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) 1215 goto err; 1216 if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) 1217 goto err; 1218 1219 /* Cipher suite. */ 1220 if (!CBB_add_u16(&server_hello, 1221 ssl3_cipher_get_value(S3I(s)->hs.new_cipher))) 1222 goto err; 1223 1224 /* Compression method (null). */ 1225 if (!CBB_add_u8(&server_hello, 0)) 1226 goto err; 1227 1228 /* TLS extensions */ 1229 if (!tlsext_serverhello_build(s, &server_hello)) { 1230 SSLerror(s, ERR_R_INTERNAL_ERROR); 1231 goto err; 1232 } 1233 1234 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 1235 goto err; 1236 } 1237 1238 /* SSL3_ST_SW_SRVR_HELLO_B */ 1239 return (ssl3_handshake_write(s)); 1240 1241 err: 1242 CBB_cleanup(&cbb); 1243 1244 return (-1); 1245 } 1246 1247 int 1248 ssl3_send_server_done(SSL *s) 1249 { 1250 CBB cbb, done; 1251 1252 memset(&cbb, 0, sizeof(cbb)); 1253 1254 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) { 1255 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &done, 1256 SSL3_MT_SERVER_DONE)) 1257 goto err; 1258 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 1259 goto err; 1260 1261 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B; 1262 } 1263 1264 /* SSL3_ST_SW_SRVR_DONE_B */ 1265 return (ssl3_handshake_write(s)); 1266 1267 err: 1268 CBB_cleanup(&cbb); 1269 1270 return (-1); 1271 } 1272 1273 int 1274 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) 1275 { 1276 CBB dh_p, dh_g, dh_Ys; 1277 DH *dh = NULL, *dhp; 1278 unsigned char *data; 1279 int al; 1280 1281 if (s->cert->dh_tmp_auto != 0) { 1282 if ((dhp = ssl_get_auto_dh(s)) == NULL) { 1283 al = SSL_AD_INTERNAL_ERROR; 1284 SSLerror(s, ERR_R_INTERNAL_ERROR); 1285 goto f_err; 1286 } 1287 } else 1288 dhp = s->cert->dh_tmp; 1289 1290 if (dhp == NULL && s->cert->dh_tmp_cb != NULL) 1291 dhp = s->cert->dh_tmp_cb(s, 0, 1292 SSL_C_PKEYLENGTH(S3I(s)->hs.new_cipher)); 1293 1294 if (dhp == NULL) { 1295 al = SSL_AD_HANDSHAKE_FAILURE; 1296 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1297 goto f_err; 1298 } 1299 1300 if (S3I(s)->tmp.dh != NULL) { 1301 SSLerror(s, ERR_R_INTERNAL_ERROR); 1302 goto err; 1303 } 1304 1305 if (s->cert->dh_tmp_auto != 0) { 1306 dh = dhp; 1307 } else if ((dh = DHparams_dup(dhp)) == NULL) { 1308 SSLerror(s, ERR_R_DH_LIB); 1309 goto err; 1310 } 1311 S3I(s)->tmp.dh = dh; 1312 if (!DH_generate_key(dh)) { 1313 SSLerror(s, ERR_R_DH_LIB); 1314 goto err; 1315 } 1316 1317 /* 1318 * Serialize the DH parameters and public key. 1319 */ 1320 if (!CBB_add_u16_length_prefixed(cbb, &dh_p)) 1321 goto err; 1322 if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p))) 1323 goto err; 1324 BN_bn2bin(dh->p, data); 1325 1326 if (!CBB_add_u16_length_prefixed(cbb, &dh_g)) 1327 goto err; 1328 if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g))) 1329 goto err; 1330 BN_bn2bin(dh->g, data); 1331 1332 if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys)) 1333 goto err; 1334 if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key))) 1335 goto err; 1336 BN_bn2bin(dh->pub_key, data); 1337 1338 if (!CBB_flush(cbb)) 1339 goto err; 1340 1341 return (1); 1342 1343 f_err: 1344 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1345 err: 1346 return (-1); 1347 } 1348 1349 static int 1350 ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb) 1351 { 1352 const EC_GROUP *group; 1353 const EC_POINT *pubkey; 1354 unsigned char *data; 1355 int encoded_len = 0; 1356 int curve_id = 0; 1357 BN_CTX *bn_ctx = NULL; 1358 EC_KEY *ecdh; 1359 CBB ecpoint; 1360 int al; 1361 1362 /* 1363 * Only named curves are supported in ECDH ephemeral key exchanges. 1364 * For supported named curves, curve_id is non-zero. 1365 */ 1366 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1367 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1368 goto err; 1369 } 1370 1371 if (S3I(s)->tmp.ecdh != NULL) { 1372 SSLerror(s, ERR_R_INTERNAL_ERROR); 1373 goto err; 1374 } 1375 1376 if ((S3I(s)->tmp.ecdh = EC_KEY_new_by_curve_name(nid)) == NULL) { 1377 al = SSL_AD_HANDSHAKE_FAILURE; 1378 SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY); 1379 goto f_err; 1380 } 1381 ecdh = S3I(s)->tmp.ecdh; 1382 1383 if (!EC_KEY_generate_key(ecdh)) { 1384 SSLerror(s, ERR_R_ECDH_LIB); 1385 goto err; 1386 } 1387 if ((group = EC_KEY_get0_group(ecdh)) == NULL || 1388 (pubkey = EC_KEY_get0_public_key(ecdh)) == NULL || 1389 EC_KEY_get0_private_key(ecdh) == NULL) { 1390 SSLerror(s, ERR_R_ECDH_LIB); 1391 goto err; 1392 } 1393 1394 /* 1395 * Encode the public key. 1396 */ 1397 encoded_len = EC_POINT_point2oct(group, pubkey, 1398 POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL); 1399 if (encoded_len == 0) { 1400 SSLerror(s, ERR_R_ECDH_LIB); 1401 goto err; 1402 } 1403 if ((bn_ctx = BN_CTX_new()) == NULL) { 1404 SSLerror(s, ERR_R_MALLOC_FAILURE); 1405 goto err; 1406 } 1407 1408 /* 1409 * Only named curves are supported in ECDH ephemeral key exchanges. 1410 * In this case the ServerKeyExchange message has: 1411 * [1 byte CurveType], [2 byte CurveName] 1412 * [1 byte length of encoded point], followed by 1413 * the actual encoded point itself. 1414 */ 1415 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1416 goto err; 1417 if (!CBB_add_u16(cbb, curve_id)) 1418 goto err; 1419 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1420 goto err; 1421 if (!CBB_add_space(&ecpoint, &data, encoded_len)) 1422 goto err; 1423 if (EC_POINT_point2oct(group, pubkey, POINT_CONVERSION_UNCOMPRESSED, 1424 data, encoded_len, bn_ctx) == 0) { 1425 SSLerror(s, ERR_R_ECDH_LIB); 1426 goto err; 1427 } 1428 if (!CBB_flush(cbb)) 1429 goto err; 1430 1431 BN_CTX_free(bn_ctx); 1432 1433 return (1); 1434 1435 f_err: 1436 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1437 err: 1438 BN_CTX_free(bn_ctx); 1439 1440 return (-1); 1441 } 1442 1443 static int 1444 ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb) 1445 { 1446 uint8_t *public_key = NULL; 1447 int curve_id; 1448 CBB ecpoint; 1449 int ret = -1; 1450 1451 /* Generate an X25519 key pair. */ 1452 if (S3I(s)->tmp.x25519 != NULL) { 1453 SSLerror(s, ERR_R_INTERNAL_ERROR); 1454 goto err; 1455 } 1456 if ((S3I(s)->tmp.x25519 = malloc(X25519_KEY_LENGTH)) == NULL) 1457 goto err; 1458 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 1459 goto err; 1460 X25519_keypair(public_key, S3I(s)->tmp.x25519); 1461 1462 /* Serialize public key. */ 1463 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1464 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1465 goto err; 1466 } 1467 1468 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1469 goto err; 1470 if (!CBB_add_u16(cbb, curve_id)) 1471 goto err; 1472 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1473 goto err; 1474 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 1475 goto err; 1476 if (!CBB_flush(cbb)) 1477 goto err; 1478 1479 ret = 1; 1480 1481 err: 1482 free(public_key); 1483 1484 return (ret); 1485 } 1486 1487 static int 1488 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) 1489 { 1490 int nid; 1491 1492 nid = tls1_get_shared_curve(s); 1493 1494 if (nid == NID_X25519) 1495 return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb); 1496 1497 return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb); 1498 } 1499 1500 int 1501 ssl3_send_server_key_exchange(SSL *s) 1502 { 1503 CBB cbb; 1504 unsigned char *params = NULL; 1505 size_t params_len; 1506 unsigned char *q; 1507 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 1508 unsigned int u; 1509 EVP_PKEY *pkey; 1510 const EVP_MD *md = NULL; 1511 unsigned char *p, *d; 1512 int al, i, j, n, kn; 1513 unsigned long type; 1514 BUF_MEM *buf; 1515 EVP_MD_CTX md_ctx; 1516 1517 memset(&cbb, 0, sizeof(cbb)); 1518 1519 EVP_MD_CTX_init(&md_ctx); 1520 if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) { 1521 type = S3I(s)->hs.new_cipher->algorithm_mkey; 1522 1523 buf = s->internal->init_buf; 1524 1525 if (!CBB_init(&cbb, 0)) 1526 goto err; 1527 1528 if (type & SSL_kDHE) { 1529 if (ssl3_send_server_kex_dhe(s, &cbb) != 1) 1530 goto err; 1531 } else if (type & SSL_kECDHE) { 1532 if (ssl3_send_server_kex_ecdhe(s, &cbb) != 1) 1533 goto err; 1534 } else { 1535 al = SSL_AD_HANDSHAKE_FAILURE; 1536 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1537 goto f_err; 1538 } 1539 1540 if (!CBB_finish(&cbb, ¶ms, ¶ms_len)) 1541 goto err; 1542 1543 if (!(S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL)) { 1544 if ((pkey = ssl_get_sign_pkey( 1545 s, S3I(s)->hs.new_cipher, &md)) == NULL) { 1546 al = SSL_AD_DECODE_ERROR; 1547 goto f_err; 1548 } 1549 kn = EVP_PKEY_size(pkey); 1550 } else { 1551 pkey = NULL; 1552 kn = 0; 1553 } 1554 1555 if (!BUF_MEM_grow_clean(buf, ssl3_handshake_msg_hdr_len(s) + 1556 params_len + kn)) { 1557 SSLerror(s, ERR_LIB_BUF); 1558 goto err; 1559 } 1560 1561 d = p = ssl3_handshake_msg_start(s, 1562 SSL3_MT_SERVER_KEY_EXCHANGE); 1563 1564 memcpy(p, params, params_len); 1565 1566 free(params); 1567 params = NULL; 1568 1569 n = params_len; 1570 p += params_len; 1571 1572 /* not anonymous */ 1573 if (pkey != NULL) { 1574 /* 1575 * n is the length of the params, they start at &(d[4]) 1576 * and p points to the space at the end. 1577 */ 1578 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s)) { 1579 q = md_buf; 1580 j = 0; 1581 if (!EVP_DigestInit_ex(&md_ctx, EVP_md5_sha1(), 1582 NULL)) 1583 goto err; 1584 EVP_DigestUpdate(&md_ctx, s->s3->client_random, 1585 SSL3_RANDOM_SIZE); 1586 EVP_DigestUpdate(&md_ctx, s->s3->server_random, 1587 SSL3_RANDOM_SIZE); 1588 EVP_DigestUpdate(&md_ctx, d, n); 1589 EVP_DigestFinal_ex(&md_ctx, q, 1590 (unsigned int *)&i); 1591 q += i; 1592 j += i; 1593 if (RSA_sign(NID_md5_sha1, md_buf, j, 1594 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 1595 SSLerror(s, ERR_R_RSA_LIB); 1596 goto err; 1597 } 1598 s2n(u, p); 1599 n += u + 2; 1600 } else if (md) { 1601 /* Send signature algorithm. */ 1602 if (SSL_USE_SIGALGS(s)) { 1603 if (!tls12_get_sigandhash(p, pkey, md)) { 1604 /* Should never happen */ 1605 al = SSL_AD_INTERNAL_ERROR; 1606 SSLerror(s, ERR_R_INTERNAL_ERROR); 1607 goto f_err; 1608 } 1609 p += 2; 1610 } 1611 EVP_SignInit_ex(&md_ctx, md, NULL); 1612 EVP_SignUpdate(&md_ctx, 1613 s->s3->client_random, 1614 SSL3_RANDOM_SIZE); 1615 EVP_SignUpdate(&md_ctx, 1616 s->s3->server_random, 1617 SSL3_RANDOM_SIZE); 1618 EVP_SignUpdate(&md_ctx, d, n); 1619 if (!EVP_SignFinal(&md_ctx, &p[2], 1620 (unsigned int *)&i, pkey)) { 1621 SSLerror(s, ERR_R_EVP_LIB); 1622 goto err; 1623 } 1624 s2n(i, p); 1625 n += i + 2; 1626 if (SSL_USE_SIGALGS(s)) 1627 n += 2; 1628 } else { 1629 /* Is this error check actually needed? */ 1630 al = SSL_AD_HANDSHAKE_FAILURE; 1631 SSLerror(s, SSL_R_UNKNOWN_PKEY_TYPE); 1632 goto f_err; 1633 } 1634 } 1635 1636 ssl3_handshake_msg_finish(s, n); 1637 } 1638 1639 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1640 1641 EVP_MD_CTX_cleanup(&md_ctx); 1642 1643 return (ssl3_handshake_write(s)); 1644 1645 f_err: 1646 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1647 err: 1648 free(params); 1649 EVP_MD_CTX_cleanup(&md_ctx); 1650 CBB_cleanup(&cbb); 1651 1652 return (-1); 1653 } 1654 1655 int 1656 ssl3_send_certificate_request(SSL *s) 1657 { 1658 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1659 STACK_OF(X509_NAME) *sk = NULL; 1660 X509_NAME *name; 1661 int i; 1662 1663 /* 1664 * Certificate Request - RFC 5246 section 7.4.4. 1665 */ 1666 1667 memset(&cbb, 0, sizeof(cbb)); 1668 1669 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1670 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &cert_request, 1671 SSL3_MT_CERTIFICATE_REQUEST)) 1672 goto err; 1673 1674 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1675 goto err; 1676 if (!ssl3_get_req_cert_types(s, &cert_types)) 1677 goto err; 1678 1679 if (SSL_USE_SIGALGS(s)) { 1680 unsigned char *sigalgs_data; 1681 size_t sigalgs_len; 1682 1683 tls12_get_req_sig_algs(s, &sigalgs_data, &sigalgs_len); 1684 1685 if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs)) 1686 goto err; 1687 if (!CBB_add_bytes(&sigalgs, sigalgs_data, sigalgs_len)) 1688 goto err; 1689 } 1690 1691 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) 1692 goto err; 1693 1694 sk = SSL_get_client_CA_list(s); 1695 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1696 unsigned char *name_data; 1697 size_t name_len; 1698 1699 name = sk_X509_NAME_value(sk, i); 1700 name_len = i2d_X509_NAME(name, NULL); 1701 1702 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) 1703 goto err; 1704 if (!CBB_add_space(&dn, &name_data, name_len)) 1705 goto err; 1706 if (i2d_X509_NAME(name, &name_data) != name_len) 1707 goto err; 1708 } 1709 1710 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 1711 goto err; 1712 1713 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B; 1714 } 1715 1716 /* SSL3_ST_SW_CERT_REQ_B */ 1717 return (ssl3_handshake_write(s)); 1718 1719 err: 1720 CBB_cleanup(&cbb); 1721 1722 return (-1); 1723 } 1724 1725 static int 1726 ssl3_get_client_kex_rsa(SSL *s, unsigned char *p, long n) 1727 { 1728 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; 1729 unsigned char *d; 1730 RSA *rsa = NULL; 1731 EVP_PKEY *pkey = NULL; 1732 int i, al; 1733 1734 d = p; 1735 1736 arc4random_buf(fakekey, sizeof(fakekey)); 1737 fakekey[0] = s->client_version >> 8; 1738 fakekey[1] = s->client_version & 0xff; 1739 1740 pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey; 1741 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || 1742 (pkey->pkey.rsa == NULL)) { 1743 al = SSL_AD_HANDSHAKE_FAILURE; 1744 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); 1745 goto f_err; 1746 } 1747 rsa = pkey->pkey.rsa; 1748 1749 if (2 > n) 1750 goto truncated; 1751 n2s(p, i); 1752 if (n != i + 2) { 1753 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1754 goto err; 1755 } else 1756 n = i; 1757 1758 i = RSA_private_decrypt((int)n, p, p, rsa, RSA_PKCS1_PADDING); 1759 1760 ERR_clear_error(); 1761 1762 al = -1; 1763 1764 if (i != SSL_MAX_MASTER_KEY_LENGTH) { 1765 al = SSL_AD_DECODE_ERROR; 1766 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ 1767 } 1768 1769 if (p - d + 2 > n) /* needed in the SSL3 case */ 1770 goto truncated; 1771 if ((al == -1) && !((p[0] == (s->client_version >> 8)) && 1772 (p[1] == (s->client_version & 0xff)))) { 1773 /* 1774 * The premaster secret must contain the same version 1775 * number as the ClientHello to detect version rollback 1776 * attacks (strangely, the protocol does not offer such 1777 * protection for DH ciphersuites). 1778 * However, buggy clients exist that send the negotiated 1779 * protocol version instead if the server does not 1780 * support the requested protocol version. 1781 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such 1782 * clients. 1783 */ 1784 if (!((s->internal->options & SSL_OP_TLS_ROLLBACK_BUG) && 1785 (p[0] == (s->version >> 8)) && 1786 (p[1] == (s->version & 0xff)))) { 1787 al = SSL_AD_DECODE_ERROR; 1788 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ 1789 1790 /* 1791 * The Klima-Pokorny-Rosa extension of 1792 * Bleichenbacher's attack 1793 * (http://eprint.iacr.org/2003/052/) exploits 1794 * the version number check as a "bad version 1795 * oracle" -- an alert would reveal that the 1796 * plaintext corresponding to some ciphertext 1797 * made up by the adversary is properly 1798 * formatted except that the version number is 1799 * wrong. 1800 * To avoid such attacks, we should treat this 1801 * just like any other decryption error. 1802 */ 1803 } 1804 } 1805 1806 if (al != -1) { 1807 /* 1808 * Some decryption failure -- use random value instead 1809 * as countermeasure against Bleichenbacher's attack 1810 * on PKCS #1 v1.5 RSA padding (see RFC 2246, 1811 * section 7.4.7.1). 1812 */ 1813 i = SSL_MAX_MASTER_KEY_LENGTH; 1814 p = fakekey; 1815 } 1816 1817 s->session->master_key_length = 1818 tls1_generate_master_secret(s, 1819 s->session->master_key, p, i); 1820 1821 explicit_bzero(p, i); 1822 1823 return (1); 1824 truncated: 1825 al = SSL_AD_DECODE_ERROR; 1826 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1827 f_err: 1828 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1829 err: 1830 return (-1); 1831 } 1832 1833 static int 1834 ssl3_get_client_kex_dhe(SSL *s, unsigned char *p, long n) 1835 { 1836 BIGNUM *bn = NULL; 1837 int key_size, al; 1838 CBS cbs, dh_Yc; 1839 DH *dh; 1840 1841 if (n < 0) 1842 goto err; 1843 1844 CBS_init(&cbs, p, n); 1845 1846 if (!CBS_get_u16_length_prefixed(&cbs, &dh_Yc)) 1847 goto truncated; 1848 1849 if (CBS_len(&cbs) != 0) 1850 goto truncated; 1851 1852 if (S3I(s)->tmp.dh == NULL) { 1853 al = SSL_AD_HANDSHAKE_FAILURE; 1854 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1855 goto f_err; 1856 } 1857 dh = S3I(s)->tmp.dh; 1858 1859 if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) { 1860 SSLerror(s, SSL_R_BN_LIB); 1861 goto err; 1862 } 1863 1864 key_size = DH_compute_key(p, bn, dh); 1865 if (key_size <= 0) { 1866 SSLerror(s, ERR_R_DH_LIB); 1867 BN_clear_free(bn); 1868 goto err; 1869 } 1870 1871 s->session->master_key_length = 1872 tls1_generate_master_secret( 1873 s, s->session->master_key, p, key_size); 1874 1875 explicit_bzero(p, key_size); 1876 1877 DH_free(S3I(s)->tmp.dh); 1878 S3I(s)->tmp.dh = NULL; 1879 1880 BN_clear_free(bn); 1881 1882 return (1); 1883 1884 truncated: 1885 al = SSL_AD_DECODE_ERROR; 1886 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1887 f_err: 1888 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1889 err: 1890 return (-1); 1891 } 1892 1893 static int 1894 ssl3_get_client_kex_ecdhe_ecp(SSL *s, unsigned char *p, long n) 1895 { 1896 EC_KEY *srvr_ecdh = NULL; 1897 EVP_PKEY *clnt_pub_pkey = NULL; 1898 EC_POINT *clnt_ecpoint = NULL; 1899 BN_CTX *bn_ctx = NULL; 1900 int i, al; 1901 1902 int ret = 1; 1903 int key_size; 1904 const EC_KEY *tkey; 1905 const EC_GROUP *group; 1906 const BIGNUM *priv_key; 1907 1908 /* Initialize structures for server's ECDH key pair. */ 1909 if ((srvr_ecdh = EC_KEY_new()) == NULL) { 1910 SSLerror(s, ERR_R_MALLOC_FAILURE); 1911 goto err; 1912 } 1913 1914 /* 1915 * Use the ephemeral values we saved when 1916 * generating the ServerKeyExchange message. 1917 */ 1918 tkey = S3I(s)->tmp.ecdh; 1919 1920 group = EC_KEY_get0_group(tkey); 1921 priv_key = EC_KEY_get0_private_key(tkey); 1922 1923 if (!EC_KEY_set_group(srvr_ecdh, group) || 1924 !EC_KEY_set_private_key(srvr_ecdh, priv_key)) { 1925 SSLerror(s, ERR_R_EC_LIB); 1926 goto err; 1927 } 1928 1929 /* Let's get client's public key */ 1930 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL) { 1931 SSLerror(s, ERR_R_MALLOC_FAILURE); 1932 goto err; 1933 } 1934 1935 if (n == 0L) { 1936 /* Client Publickey was in Client Certificate */ 1937 if (((clnt_pub_pkey = X509_get_pubkey( 1938 s->session->peer)) == NULL) || 1939 (clnt_pub_pkey->type != EVP_PKEY_EC)) { 1940 /* 1941 * XXX: For now, we do not support client 1942 * authentication using ECDH certificates 1943 * so this branch (n == 0L) of the code is 1944 * never executed. When that support is 1945 * added, we ought to ensure the key 1946 * received in the certificate is 1947 * authorized for key agreement. 1948 * ECDH_compute_key implicitly checks that 1949 * the two ECDH shares are for the same 1950 * group. 1951 */ 1952 al = SSL_AD_HANDSHAKE_FAILURE; 1953 SSLerror(s, SSL_R_UNABLE_TO_DECODE_ECDH_CERTS); 1954 goto f_err; 1955 } 1956 1957 if (EC_POINT_copy(clnt_ecpoint, 1958 EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) 1959 == 0) { 1960 SSLerror(s, ERR_R_EC_LIB); 1961 goto err; 1962 } 1963 ret = 2; /* Skip certificate verify processing */ 1964 } else { 1965 /* 1966 * Get client's public key from encoded point 1967 * in the ClientKeyExchange message. 1968 */ 1969 if ((bn_ctx = BN_CTX_new()) == NULL) { 1970 SSLerror(s, ERR_R_MALLOC_FAILURE); 1971 goto err; 1972 } 1973 1974 /* Get encoded point length */ 1975 i = *p; 1976 1977 p += 1; 1978 if (n != 1 + i) { 1979 SSLerror(s, ERR_R_EC_LIB); 1980 goto err; 1981 } 1982 if (EC_POINT_oct2point(group, 1983 clnt_ecpoint, p, i, bn_ctx) == 0) { 1984 SSLerror(s, ERR_R_EC_LIB); 1985 goto err; 1986 } 1987 /* 1988 * p is pointing to somewhere in the buffer 1989 * currently, so set it to the start. 1990 */ 1991 p = (unsigned char *)s->internal->init_buf->data; 1992 } 1993 1994 /* Compute the shared pre-master secret */ 1995 key_size = ECDH_size(srvr_ecdh); 1996 if (key_size <= 0) { 1997 SSLerror(s, ERR_R_ECDH_LIB); 1998 goto err; 1999 } 2000 i = ECDH_compute_key(p, key_size, clnt_ecpoint, srvr_ecdh, 2001 NULL); 2002 if (i <= 0) { 2003 SSLerror(s, ERR_R_ECDH_LIB); 2004 goto err; 2005 } 2006 2007 EVP_PKEY_free(clnt_pub_pkey); 2008 EC_POINT_free(clnt_ecpoint); 2009 EC_KEY_free(srvr_ecdh); 2010 BN_CTX_free(bn_ctx); 2011 EC_KEY_free(S3I(s)->tmp.ecdh); 2012 S3I(s)->tmp.ecdh = NULL; 2013 2014 /* Compute the master secret */ 2015 s->session->master_key_length = 2016 tls1_generate_master_secret( 2017 s, s->session->master_key, p, i); 2018 2019 explicit_bzero(p, i); 2020 return (ret); 2021 2022 f_err: 2023 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2024 err: 2025 EVP_PKEY_free(clnt_pub_pkey); 2026 EC_POINT_free(clnt_ecpoint); 2027 EC_KEY_free(srvr_ecdh); 2028 BN_CTX_free(bn_ctx); 2029 return (-1); 2030 } 2031 2032 static int 2033 ssl3_get_client_kex_ecdhe_ecx(SSL *s, unsigned char *p, long n) 2034 { 2035 uint8_t *shared_key = NULL; 2036 CBS cbs, ecpoint; 2037 int ret = -1; 2038 2039 if (n < 0) 2040 goto err; 2041 2042 CBS_init(&cbs, p, n); 2043 if (!CBS_get_u8_length_prefixed(&cbs, &ecpoint)) 2044 goto err; 2045 if (CBS_len(&ecpoint) != X25519_KEY_LENGTH) 2046 goto err; 2047 2048 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 2049 goto err; 2050 if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint))) 2051 goto err; 2052 2053 freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH); 2054 S3I(s)->tmp.x25519 = NULL; 2055 2056 s->session->master_key_length = 2057 tls1_generate_master_secret( 2058 s, s->session->master_key, shared_key, X25519_KEY_LENGTH); 2059 2060 ret = 1; 2061 2062 err: 2063 freezero(shared_key, X25519_KEY_LENGTH); 2064 2065 return (ret); 2066 } 2067 2068 static int 2069 ssl3_get_client_kex_ecdhe(SSL *s, unsigned char *p, long n) 2070 { 2071 if (S3I(s)->tmp.x25519 != NULL) 2072 return ssl3_get_client_kex_ecdhe_ecx(s, p, n); 2073 2074 return ssl3_get_client_kex_ecdhe_ecp(s, p, n); 2075 } 2076 2077 static int 2078 ssl3_get_client_kex_gost(SSL *s, unsigned char *p, long n) 2079 { 2080 2081 EVP_PKEY_CTX *pkey_ctx; 2082 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; 2083 unsigned char premaster_secret[32], *start; 2084 size_t outlen = 32, inlen; 2085 unsigned long alg_a; 2086 int Ttag, Tclass; 2087 long Tlen; 2088 int al; 2089 int ret = 0; 2090 2091 /* Get our certificate private key*/ 2092 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 2093 if (alg_a & SSL_aGOST01) 2094 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 2095 2096 pkey_ctx = EVP_PKEY_CTX_new(pk, NULL); 2097 EVP_PKEY_decrypt_init(pkey_ctx); 2098 /* 2099 * If client certificate is present and is of the same type, 2100 * maybe use it for key exchange. 2101 * Don't mind errors from EVP_PKEY_derive_set_peer, because 2102 * it is completely valid to use a client certificate for 2103 * authorization only. 2104 */ 2105 client_pub_pkey = X509_get_pubkey(s->session->peer); 2106 if (client_pub_pkey) { 2107 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2108 client_pub_pkey) <= 0) 2109 ERR_clear_error(); 2110 } 2111 if (2 > n) 2112 goto truncated; 2113 /* Decrypt session key */ 2114 if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, 2115 &Tclass, n) != V_ASN1_CONSTRUCTED || 2116 Ttag != V_ASN1_SEQUENCE || Tclass != V_ASN1_UNIVERSAL) { 2117 SSLerror(s, SSL_R_DECRYPTION_FAILED); 2118 goto gerr; 2119 } 2120 start = p; 2121 inlen = Tlen; 2122 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 2123 start, inlen) <=0) { 2124 SSLerror(s, SSL_R_DECRYPTION_FAILED); 2125 goto gerr; 2126 } 2127 /* Generate master secret */ 2128 s->session->master_key_length = 2129 tls1_generate_master_secret( 2130 s, s->session->master_key, premaster_secret, 32); 2131 /* Check if pubkey from client certificate was used */ 2132 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, 2133 EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) 2134 ret = 2; 2135 else 2136 ret = 1; 2137 gerr: 2138 EVP_PKEY_free(client_pub_pkey); 2139 EVP_PKEY_CTX_free(pkey_ctx); 2140 if (ret) 2141 return (ret); 2142 else 2143 goto err; 2144 2145 truncated: 2146 al = SSL_AD_DECODE_ERROR; 2147 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2148 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2149 err: 2150 return (-1); 2151 } 2152 2153 int 2154 ssl3_get_client_key_exchange(SSL *s) 2155 { 2156 unsigned long alg_k; 2157 unsigned char *p; 2158 int al, ok; 2159 long n; 2160 2161 /* 2048 maxlen is a guess. How long a key does that permit? */ 2162 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 2163 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok); 2164 if (!ok) 2165 return ((int)n); 2166 2167 p = (unsigned char *)s->internal->init_msg; 2168 2169 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2170 2171 if (alg_k & SSL_kRSA) { 2172 if (ssl3_get_client_kex_rsa(s, p, n) != 1) 2173 goto err; 2174 } else if (alg_k & SSL_kDHE) { 2175 if (ssl3_get_client_kex_dhe(s, p, n) != 1) 2176 goto err; 2177 } else if (alg_k & SSL_kECDHE) { 2178 if (ssl3_get_client_kex_ecdhe(s, p, n) != 1) 2179 goto err; 2180 } else if (alg_k & SSL_kGOST) { 2181 if (ssl3_get_client_kex_gost(s, p, n) != 1) 2182 goto err; 2183 } else { 2184 al = SSL_AD_HANDSHAKE_FAILURE; 2185 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 2186 goto f_err; 2187 } 2188 2189 return (1); 2190 2191 f_err: 2192 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2193 err: 2194 return (-1); 2195 } 2196 2197 int 2198 ssl3_get_cert_verify(SSL *s) 2199 { 2200 EVP_PKEY *pkey = NULL; 2201 unsigned char *p; 2202 int al, ok, ret = 0; 2203 long n; 2204 int type = 0, i, j; 2205 X509 *peer; 2206 const EVP_MD *md = NULL; 2207 EVP_MD_CTX mctx; 2208 EVP_MD_CTX_init(&mctx); 2209 2210 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 2211 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok); 2212 if (!ok) 2213 return ((int)n); 2214 2215 if (s->session->peer != NULL) { 2216 peer = s->session->peer; 2217 pkey = X509_get_pubkey(peer); 2218 type = X509_certificate_type(peer, pkey); 2219 } else { 2220 peer = NULL; 2221 pkey = NULL; 2222 } 2223 2224 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 2225 S3I(s)->tmp.reuse_message = 1; 2226 if (peer != NULL) { 2227 al = SSL_AD_UNEXPECTED_MESSAGE; 2228 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 2229 goto f_err; 2230 } 2231 ret = 1; 2232 goto end; 2233 } 2234 2235 if (peer == NULL) { 2236 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 2237 al = SSL_AD_UNEXPECTED_MESSAGE; 2238 goto f_err; 2239 } 2240 2241 if (!(type & EVP_PKT_SIGN)) { 2242 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 2243 al = SSL_AD_ILLEGAL_PARAMETER; 2244 goto f_err; 2245 } 2246 2247 if (S3I(s)->change_cipher_spec) { 2248 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 2249 al = SSL_AD_UNEXPECTED_MESSAGE; 2250 goto f_err; 2251 } 2252 2253 /* we now have a signature that we need to verify */ 2254 p = (unsigned char *)s->internal->init_msg; 2255 /* 2256 * Check for broken implementations of GOST ciphersuites. 2257 * 2258 * If key is GOST and n is exactly 64, it is a bare 2259 * signature without length field. 2260 */ 2261 if (n == 64 && (pkey->type == NID_id_GostR3410_94 || 2262 pkey->type == NID_id_GostR3410_2001) ) { 2263 i = 64; 2264 } else { 2265 if (SSL_USE_SIGALGS(s)) { 2266 int sigalg = tls12_get_sigid(pkey); 2267 /* Should never happen */ 2268 if (sigalg == -1) { 2269 SSLerror(s, ERR_R_INTERNAL_ERROR); 2270 al = SSL_AD_INTERNAL_ERROR; 2271 goto f_err; 2272 } 2273 if (2 > n) 2274 goto truncated; 2275 /* Check key type is consistent with signature */ 2276 if (sigalg != (int)p[1]) { 2277 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 2278 al = SSL_AD_DECODE_ERROR; 2279 goto f_err; 2280 } 2281 md = tls12_get_hash(p[0]); 2282 if (md == NULL) { 2283 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2284 al = SSL_AD_DECODE_ERROR; 2285 goto f_err; 2286 } 2287 p += 2; 2288 n -= 2; 2289 } 2290 if (2 > n) 2291 goto truncated; 2292 n2s(p, i); 2293 n -= 2; 2294 if (i > n) 2295 goto truncated; 2296 } 2297 j = EVP_PKEY_size(pkey); 2298 if ((i > j) || (n > j) || (n <= 0)) { 2299 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2300 al = SSL_AD_DECODE_ERROR; 2301 goto f_err; 2302 } 2303 2304 if (SSL_USE_SIGALGS(s)) { 2305 long hdatalen = 0; 2306 void *hdata; 2307 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata); 2308 if (hdatalen <= 0) { 2309 SSLerror(s, ERR_R_INTERNAL_ERROR); 2310 al = SSL_AD_INTERNAL_ERROR; 2311 goto f_err; 2312 } 2313 if (!EVP_VerifyInit_ex(&mctx, md, NULL) || 2314 !EVP_VerifyUpdate(&mctx, hdata, hdatalen)) { 2315 SSLerror(s, ERR_R_EVP_LIB); 2316 al = SSL_AD_INTERNAL_ERROR; 2317 goto f_err; 2318 } 2319 2320 if (EVP_VerifyFinal(&mctx, p, i, pkey) <= 0) { 2321 al = SSL_AD_DECRYPT_ERROR; 2322 SSLerror(s, SSL_R_BAD_SIGNATURE); 2323 goto f_err; 2324 } 2325 } else 2326 if (pkey->type == EVP_PKEY_RSA) { 2327 i = RSA_verify(NID_md5_sha1, S3I(s)->tmp.cert_verify_md, 2328 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, p, i, 2329 pkey->pkey.rsa); 2330 if (i < 0) { 2331 al = SSL_AD_DECRYPT_ERROR; 2332 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2333 goto f_err; 2334 } 2335 if (i == 0) { 2336 al = SSL_AD_DECRYPT_ERROR; 2337 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2338 goto f_err; 2339 } 2340 } else 2341 if (pkey->type == EVP_PKEY_EC) { 2342 j = ECDSA_verify(pkey->save_type, 2343 &(S3I(s)->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), 2344 SHA_DIGEST_LENGTH, p, i, pkey->pkey.ec); 2345 if (j <= 0) { 2346 /* bad signature */ 2347 al = SSL_AD_DECRYPT_ERROR; 2348 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2349 goto f_err; 2350 } 2351 } else 2352 #ifndef OPENSSL_NO_GOST 2353 if (pkey->type == NID_id_GostR3410_94 || 2354 pkey->type == NID_id_GostR3410_2001) { 2355 long hdatalen = 0; 2356 void *hdata; 2357 unsigned char signature[128]; 2358 unsigned int siglen = sizeof(signature); 2359 int nid; 2360 EVP_PKEY_CTX *pctx; 2361 2362 hdatalen = BIO_get_mem_data(S3I(s)->handshake_buffer, &hdata); 2363 if (hdatalen <= 0) { 2364 SSLerror(s, ERR_R_INTERNAL_ERROR); 2365 al = SSL_AD_INTERNAL_ERROR; 2366 goto f_err; 2367 } 2368 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2369 !(md = EVP_get_digestbynid(nid))) { 2370 SSLerror(s, ERR_R_EVP_LIB); 2371 al = SSL_AD_INTERNAL_ERROR; 2372 goto f_err; 2373 } 2374 pctx = EVP_PKEY_CTX_new(pkey, NULL); 2375 if (!pctx) { 2376 SSLerror(s, ERR_R_EVP_LIB); 2377 al = SSL_AD_INTERNAL_ERROR; 2378 goto f_err; 2379 } 2380 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2381 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2382 !EVP_DigestFinal(&mctx, signature, &siglen) || 2383 (EVP_PKEY_verify_init(pctx) <= 0) || 2384 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2385 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2386 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2387 GOST_SIG_FORMAT_RS_LE, 2388 NULL) <= 0)) { 2389 SSLerror(s, ERR_R_EVP_LIB); 2390 al = SSL_AD_INTERNAL_ERROR; 2391 EVP_PKEY_CTX_free(pctx); 2392 goto f_err; 2393 } 2394 2395 if (EVP_PKEY_verify(pctx, p, i, signature, siglen) <= 0) { 2396 al = SSL_AD_DECRYPT_ERROR; 2397 SSLerror(s, SSL_R_BAD_SIGNATURE); 2398 EVP_PKEY_CTX_free(pctx); 2399 goto f_err; 2400 } 2401 2402 EVP_PKEY_CTX_free(pctx); 2403 } else 2404 #endif 2405 { 2406 SSLerror(s, ERR_R_INTERNAL_ERROR); 2407 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2408 goto f_err; 2409 } 2410 2411 2412 ret = 1; 2413 if (0) { 2414 truncated: 2415 al = SSL_AD_DECODE_ERROR; 2416 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2417 f_err: 2418 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2419 } 2420 end: 2421 if (S3I(s)->handshake_buffer) { 2422 BIO_free(S3I(s)->handshake_buffer); 2423 S3I(s)->handshake_buffer = NULL; 2424 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE; 2425 } 2426 EVP_MD_CTX_cleanup(&mctx); 2427 EVP_PKEY_free(pkey); 2428 return (ret); 2429 } 2430 2431 int 2432 ssl3_get_client_certificate(SSL *s) 2433 { 2434 CBS cbs, client_certs; 2435 int i, ok, al, ret = -1; 2436 X509 *x = NULL; 2437 long n; 2438 const unsigned char *q; 2439 STACK_OF(X509) *sk = NULL; 2440 2441 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2442 -1, s->internal->max_cert_list, &ok); 2443 2444 if (!ok) 2445 return ((int)n); 2446 2447 if (S3I(s)->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2448 if ((s->verify_mode & SSL_VERIFY_PEER) && 2449 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2450 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2451 al = SSL_AD_HANDSHAKE_FAILURE; 2452 goto f_err; 2453 } 2454 /* 2455 * If tls asked for a client cert, 2456 * the client must return a 0 list. 2457 */ 2458 if (S3I(s)->tmp.cert_request) { 2459 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 2460 ); 2461 al = SSL_AD_UNEXPECTED_MESSAGE; 2462 goto f_err; 2463 } 2464 S3I(s)->tmp.reuse_message = 1; 2465 return (1); 2466 } 2467 2468 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 2469 al = SSL_AD_UNEXPECTED_MESSAGE; 2470 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2471 goto f_err; 2472 } 2473 2474 if (n < 0) 2475 goto truncated; 2476 2477 CBS_init(&cbs, s->internal->init_msg, n); 2478 2479 if ((sk = sk_X509_new_null()) == NULL) { 2480 SSLerror(s, ERR_R_MALLOC_FAILURE); 2481 goto err; 2482 } 2483 2484 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) || 2485 CBS_len(&cbs) != 0) 2486 goto truncated; 2487 2488 while (CBS_len(&client_certs) > 0) { 2489 CBS cert; 2490 2491 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) { 2492 al = SSL_AD_DECODE_ERROR; 2493 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2494 goto f_err; 2495 } 2496 2497 q = CBS_data(&cert); 2498 x = d2i_X509(NULL, &q, CBS_len(&cert)); 2499 if (x == NULL) { 2500 SSLerror(s, ERR_R_ASN1_LIB); 2501 goto err; 2502 } 2503 if (q != CBS_data(&cert) + CBS_len(&cert)) { 2504 al = SSL_AD_DECODE_ERROR; 2505 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2506 goto f_err; 2507 } 2508 if (!sk_X509_push(sk, x)) { 2509 SSLerror(s, ERR_R_MALLOC_FAILURE); 2510 goto err; 2511 } 2512 x = NULL; 2513 } 2514 2515 if (sk_X509_num(sk) <= 0) { 2516 /* 2517 * TLS does not mind 0 certs returned. 2518 * Fail for TLS only if we required a certificate. 2519 */ 2520 if ((s->verify_mode & SSL_VERIFY_PEER) && 2521 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2522 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2523 al = SSL_AD_HANDSHAKE_FAILURE; 2524 goto f_err; 2525 } 2526 /* No client certificate so digest cached records */ 2527 if (S3I(s)->handshake_buffer && !tls1_digest_cached_records(s)) { 2528 al = SSL_AD_INTERNAL_ERROR; 2529 goto f_err; 2530 } 2531 } else { 2532 i = ssl_verify_cert_chain(s, sk); 2533 if (i <= 0) { 2534 al = ssl_verify_alarm_type(s->verify_result); 2535 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2536 goto f_err; 2537 } 2538 } 2539 2540 X509_free(s->session->peer); 2541 s->session->peer = sk_X509_shift(sk); 2542 s->session->verify_result = s->verify_result; 2543 2544 /* 2545 * With the current implementation, sess_cert will always be NULL 2546 * when we arrive here 2547 */ 2548 if (SSI(s)->sess_cert == NULL) { 2549 SSI(s)->sess_cert = ssl_sess_cert_new(); 2550 if (SSI(s)->sess_cert == NULL) { 2551 SSLerror(s, ERR_R_MALLOC_FAILURE); 2552 goto err; 2553 } 2554 } 2555 sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free); 2556 SSI(s)->sess_cert->cert_chain = sk; 2557 2558 /* 2559 * Inconsistency alert: cert_chain does *not* include the 2560 * peer's own certificate, while we do include it in s3_clnt.c 2561 */ 2562 2563 sk = NULL; 2564 2565 ret = 1; 2566 if (0) { 2567 truncated: 2568 al = SSL_AD_DECODE_ERROR; 2569 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2570 f_err: 2571 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2572 } 2573 err: 2574 X509_free(x); 2575 sk_X509_pop_free(sk, X509_free); 2576 2577 return (ret); 2578 } 2579 2580 int 2581 ssl3_send_server_certificate(SSL *s) 2582 { 2583 CBB cbb, server_cert; 2584 X509 *x; 2585 2586 /* 2587 * Server Certificate - RFC 5246, section 7.4.2. 2588 */ 2589 2590 memset(&cbb, 0, sizeof(cbb)); 2591 2592 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) { 2593 if ((x = ssl_get_server_send_cert(s)) == NULL) { 2594 SSLerror(s, ERR_R_INTERNAL_ERROR); 2595 return (0); 2596 } 2597 2598 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &server_cert, 2599 SSL3_MT_CERTIFICATE)) 2600 goto err; 2601 if (!ssl3_output_cert_chain(s, &server_cert, x)) 2602 goto err; 2603 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 2604 goto err; 2605 2606 S3I(s)->hs.state = SSL3_ST_SW_CERT_B; 2607 } 2608 2609 /* SSL3_ST_SW_CERT_B */ 2610 return (ssl3_handshake_write(s)); 2611 2612 err: 2613 CBB_cleanup(&cbb); 2614 2615 return (0); 2616 } 2617 2618 /* send a new session ticket (not necessarily for a new session) */ 2619 int 2620 ssl3_send_newsession_ticket(SSL *s) 2621 { 2622 unsigned char *d, *p, *macstart; 2623 unsigned char *senc = NULL; 2624 const unsigned char *const_p; 2625 int len, slen_full, slen; 2626 SSL_SESSION *sess; 2627 unsigned int hlen; 2628 EVP_CIPHER_CTX ctx; 2629 HMAC_CTX hctx; 2630 SSL_CTX *tctx = s->initial_ctx; 2631 unsigned char iv[EVP_MAX_IV_LENGTH]; 2632 unsigned char key_name[16]; 2633 2634 if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2635 /* get session encoding length */ 2636 slen_full = i2d_SSL_SESSION(s->session, NULL); 2637 /* 2638 * Some length values are 16 bits, so forget it if session is 2639 * too long 2640 */ 2641 if (slen_full > 0xFF00) 2642 goto err; 2643 senc = malloc(slen_full); 2644 if (!senc) 2645 goto err; 2646 p = senc; 2647 i2d_SSL_SESSION(s->session, &p); 2648 2649 /* 2650 * Create a fresh copy (not shared with other threads) to 2651 * clean up 2652 */ 2653 const_p = senc; 2654 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); 2655 if (sess == NULL) 2656 goto err; 2657 2658 /* ID is irrelevant for the ticket */ 2659 sess->session_id_length = 0; 2660 2661 slen = i2d_SSL_SESSION(sess, NULL); 2662 if (slen > slen_full) { 2663 /* shouldn't ever happen */ 2664 goto err; 2665 } 2666 p = senc; 2667 i2d_SSL_SESSION(sess, &p); 2668 SSL_SESSION_free(sess); 2669 2670 /* 2671 * Grow buffer if need be: the length calculation is as 2672 * follows 1 (size of message name) + 3 (message length 2673 * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) + 2674 * 16 (key name) + max_iv_len (iv length) + 2675 * session_length + max_enc_block_size (max encrypted session 2676 * length) + max_md_size (HMAC). 2677 */ 2678 if (!BUF_MEM_grow(s->internal->init_buf, ssl3_handshake_msg_hdr_len(s) + 2679 22 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH + 2680 EVP_MAX_MD_SIZE + slen)) 2681 goto err; 2682 2683 d = p = ssl3_handshake_msg_start(s, SSL3_MT_NEWSESSION_TICKET); 2684 2685 EVP_CIPHER_CTX_init(&ctx); 2686 HMAC_CTX_init(&hctx); 2687 2688 /* 2689 * Initialize HMAC and cipher contexts. If callback present 2690 * it does all the work otherwise use generated values 2691 * from parent ctx. 2692 */ 2693 if (tctx->internal->tlsext_ticket_key_cb) { 2694 if (tctx->internal->tlsext_ticket_key_cb(s, 2695 key_name, iv, &ctx, &hctx, 1) < 0) { 2696 EVP_CIPHER_CTX_cleanup(&ctx); 2697 goto err; 2698 } 2699 } else { 2700 arc4random_buf(iv, 16); 2701 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 2702 tctx->internal->tlsext_tick_aes_key, iv); 2703 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key, 2704 16, tlsext_tick_md(), NULL); 2705 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); 2706 } 2707 2708 /* 2709 * Ticket lifetime hint (advisory only): 2710 * We leave this unspecified for resumed session 2711 * (for simplicity), and guess that tickets for new 2712 * sessions will live as long as their sessions. 2713 */ 2714 l2n(s->internal->hit ? 0 : s->session->timeout, p); 2715 2716 /* Skip ticket length for now */ 2717 p += 2; 2718 /* Output key name */ 2719 macstart = p; 2720 memcpy(p, key_name, 16); 2721 p += 16; 2722 /* output IV */ 2723 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 2724 p += EVP_CIPHER_CTX_iv_length(&ctx); 2725 /* Encrypt session data */ 2726 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 2727 p += len; 2728 EVP_EncryptFinal_ex(&ctx, p, &len); 2729 p += len; 2730 EVP_CIPHER_CTX_cleanup(&ctx); 2731 2732 HMAC_Update(&hctx, macstart, p - macstart); 2733 HMAC_Final(&hctx, p, &hlen); 2734 HMAC_CTX_cleanup(&hctx); 2735 p += hlen; 2736 2737 /* Now write out lengths: p points to end of data written */ 2738 /* Total length */ 2739 len = p - d; 2740 2741 /* Skip ticket lifetime hint. */ 2742 p = d + 4; 2743 s2n(len - 6, p); /* Message length */ 2744 2745 ssl3_handshake_msg_finish(s, len); 2746 2747 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2748 2749 freezero(senc, slen_full); 2750 } 2751 2752 /* SSL3_ST_SW_SESSION_TICKET_B */ 2753 return (ssl3_handshake_write(s)); 2754 2755 err: 2756 freezero(senc, slen_full); 2757 2758 return (-1); 2759 } 2760 2761 int 2762 ssl3_send_cert_status(SSL *s) 2763 { 2764 CBB cbb, certstatus, ocspresp; 2765 2766 memset(&cbb, 0, sizeof(cbb)); 2767 2768 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2769 if (!ssl3_handshake_msg_start_cbb(s, &cbb, &certstatus, 2770 SSL3_MT_CERTIFICATE_STATUS)) 2771 goto err; 2772 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2773 goto err; 2774 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2775 goto err; 2776 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, 2777 s->internal->tlsext_ocsp_resplen)) 2778 goto err; 2779 if (!ssl3_handshake_msg_finish_cbb(s, &cbb)) 2780 goto err; 2781 2782 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2783 } 2784 2785 /* SSL3_ST_SW_CERT_STATUS_B */ 2786 return (ssl3_handshake_write(s)); 2787 2788 err: 2789 CBB_cleanup(&cbb); 2790 2791 return (-1); 2792 } 2793