1 /* $OpenBSD: ssl_srvr.c,v 1.68 2019/04/22 15:12:20 jsing Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 /* ==================================================================== 59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved. 60 * 61 * Redistribution and use in source and binary forms, with or without 62 * modification, are permitted provided that the following conditions 63 * are met: 64 * 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 68 * 2. Redistributions in binary form must reproduce the above copyright 69 * notice, this list of conditions and the following disclaimer in 70 * the documentation and/or other materials provided with the 71 * distribution. 72 * 73 * 3. All advertising materials mentioning features or use of this 74 * software must display the following acknowledgment: 75 * "This product includes software developed by the OpenSSL Project 76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 77 * 78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 79 * endorse or promote products derived from this software without 80 * prior written permission. For written permission, please contact 81 * openssl-core@openssl.org. 82 * 83 * 5. Products derived from this software may not be called "OpenSSL" 84 * nor may "OpenSSL" appear in their names without prior written 85 * permission of the OpenSSL Project. 86 * 87 * 6. Redistributions of any form whatsoever must retain the following 88 * acknowledgment: 89 * "This product includes software developed by the OpenSSL Project 90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)" 91 * 92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 103 * OF THE POSSIBILITY OF SUCH DAMAGE. 104 * ==================================================================== 105 * 106 * This product includes cryptographic software written by Eric Young 107 * (eay@cryptsoft.com). This product includes software written by Tim 108 * Hudson (tjh@cryptsoft.com). 109 * 110 */ 111 /* ==================================================================== 112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. 113 * 114 * Portions of the attached software ("Contribution") are developed by 115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project. 116 * 117 * The Contribution is licensed pursuant to the OpenSSL open source 118 * license provided above. 119 * 120 * ECC cipher suite support in OpenSSL originally written by 121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories. 122 * 123 */ 124 /* ==================================================================== 125 * Copyright 2005 Nokia. All rights reserved. 126 * 127 * The portions of the attached software ("Contribution") is developed by 128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source 129 * license. 130 * 131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of 132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites 133 * support (see RFC 4279) to OpenSSL. 134 * 135 * No patent licenses or other rights except those expressly stated in 136 * the OpenSSL open source license shall be deemed granted or received 137 * expressly, by implication, estoppel, or otherwise. 138 * 139 * No assurances are provided by Nokia that the Contribution does not 140 * infringe the patent or other intellectual property rights of any third 141 * party or that the license provides you with all the necessary rights 142 * to make use of the Contribution. 143 * 144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN 145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA 146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY 147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR 148 * OTHERWISE. 149 */ 150 151 #include <stdio.h> 152 153 #include "ssl_locl.h" 154 155 #include <openssl/bn.h> 156 #include <openssl/buffer.h> 157 #include <openssl/curve25519.h> 158 #include <openssl/evp.h> 159 #include <openssl/dh.h> 160 #ifndef OPENSSL_NO_GOST 161 #include <openssl/gost.h> 162 #endif 163 #include <openssl/hmac.h> 164 #include <openssl/md5.h> 165 #include <openssl/objects.h> 166 #include <openssl/x509.h> 167 168 #include "bytestring.h" 169 #include "ssl_sigalgs.h" 170 #include "ssl_tlsext.h" 171 172 int 173 ssl3_accept(SSL *s) 174 { 175 void (*cb)(const SSL *ssl, int type, int val) = NULL; 176 unsigned long alg_k; 177 int ret = -1; 178 int new_state, state, skip = 0; 179 int listen = 0; 180 181 ERR_clear_error(); 182 errno = 0; 183 184 if (s->internal->info_callback != NULL) 185 cb = s->internal->info_callback; 186 else if (s->ctx->internal->info_callback != NULL) 187 cb = s->ctx->internal->info_callback; 188 189 if (SSL_IS_DTLS(s)) 190 listen = D1I(s)->listen; 191 192 /* init things to blank */ 193 s->internal->in_handshake++; 194 if (!SSL_in_init(s) || SSL_in_before(s)) 195 SSL_clear(s); 196 197 if (SSL_IS_DTLS(s)) 198 D1I(s)->listen = listen; 199 200 for (;;) { 201 state = S3I(s)->hs.state; 202 203 switch (S3I(s)->hs.state) { 204 case SSL_ST_RENEGOTIATE: 205 s->internal->renegotiate = 1; 206 /* S3I(s)->hs.state=SSL_ST_ACCEPT; */ 207 208 case SSL_ST_BEFORE: 209 case SSL_ST_ACCEPT: 210 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 211 case SSL_ST_OK|SSL_ST_ACCEPT: 212 s->server = 1; 213 if (cb != NULL) 214 cb(s, SSL_CB_HANDSHAKE_START, 1); 215 216 if (SSL_IS_DTLS(s)) { 217 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { 218 SSLerror(s, ERR_R_INTERNAL_ERROR); 219 ret = -1; 220 goto end; 221 } 222 } else { 223 if ((s->version >> 8) != 3) { 224 SSLerror(s, ERR_R_INTERNAL_ERROR); 225 ret = -1; 226 goto end; 227 } 228 } 229 s->internal->type = SSL_ST_ACCEPT; 230 231 if (!ssl3_setup_init_buffer(s)) { 232 ret = -1; 233 goto end; 234 } 235 if (!ssl3_setup_buffers(s)) { 236 ret = -1; 237 goto end; 238 } 239 240 s->internal->init_num = 0; 241 242 if (S3I(s)->hs.state != SSL_ST_RENEGOTIATE) { 243 /* 244 * Ok, we now need to push on a buffering BIO 245 * so that the output is sent in a way that 246 * TCP likes :-) 247 */ 248 if (!ssl_init_wbio_buffer(s, 1)) { 249 ret = -1; 250 goto end; 251 } 252 253 if (!tls1_transcript_init(s)) { 254 ret = -1; 255 goto end; 256 } 257 258 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_A; 259 s->ctx->internal->stats.sess_accept++; 260 } else if (!SSL_IS_DTLS(s) && !S3I(s)->send_connection_binding) { 261 /* 262 * Server attempting to renegotiate with 263 * client that doesn't support secure 264 * renegotiation. 265 */ 266 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 267 ssl3_send_alert(s, SSL3_AL_FATAL, 268 SSL_AD_HANDSHAKE_FAILURE); 269 ret = -1; 270 goto end; 271 } else { 272 /* 273 * S3I(s)->hs.state == SSL_ST_RENEGOTIATE, 274 * we will just send a HelloRequest. 275 */ 276 s->ctx->internal->stats.sess_accept_renegotiate++; 277 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_A; 278 } 279 break; 280 281 case SSL3_ST_SW_HELLO_REQ_A: 282 case SSL3_ST_SW_HELLO_REQ_B: 283 s->internal->shutdown = 0; 284 if (SSL_IS_DTLS(s)) { 285 dtls1_clear_record_buffer(s); 286 dtls1_start_timer(s); 287 } 288 ret = ssl3_send_hello_request(s); 289 if (ret <= 0) 290 goto end; 291 if (SSL_IS_DTLS(s)) 292 S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A; 293 else 294 S3I(s)->hs.next_state = SSL3_ST_SW_HELLO_REQ_C; 295 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 296 s->internal->init_num = 0; 297 298 if (!tls1_transcript_init(s)) { 299 ret = -1; 300 goto end; 301 } 302 break; 303 304 case SSL3_ST_SW_HELLO_REQ_C: 305 S3I(s)->hs.state = SSL_ST_OK; 306 break; 307 308 case SSL3_ST_SR_CLNT_HELLO_A: 309 case SSL3_ST_SR_CLNT_HELLO_B: 310 case SSL3_ST_SR_CLNT_HELLO_C: 311 s->internal->shutdown = 0; 312 if (SSL_IS_DTLS(s)) { 313 ret = ssl3_get_client_hello(s); 314 if (ret <= 0) 315 goto end; 316 dtls1_stop_timer(s); 317 318 if (ret == 1 && 319 (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 320 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 321 else 322 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 323 324 s->internal->init_num = 0; 325 326 /* 327 * Reflect ClientHello sequence to remain 328 * stateless while listening. 329 */ 330 if (listen) { 331 memcpy(S3I(s)->write_sequence, 332 S3I(s)->read_sequence, 333 sizeof(S3I(s)->write_sequence)); 334 } 335 336 /* If we're just listening, stop here */ 337 if (listen && S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 338 ret = 2; 339 D1I(s)->listen = 0; 340 /* 341 * Set expected sequence numbers to 342 * continue the handshake. 343 */ 344 D1I(s)->handshake_read_seq = 2; 345 D1I(s)->handshake_write_seq = 1; 346 D1I(s)->next_handshake_write_seq = 1; 347 goto end; 348 } 349 } else { 350 if (s->internal->rwstate != SSL_X509_LOOKUP) { 351 ret = ssl3_get_client_hello(s); 352 if (ret <= 0) 353 goto end; 354 } 355 356 s->internal->renegotiate = 2; 357 S3I(s)->hs.state = SSL3_ST_SW_SRVR_HELLO_A; 358 s->internal->init_num = 0; 359 } 360 break; 361 362 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 363 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 364 ret = dtls1_send_hello_verify_request(s); 365 if (ret <= 0) 366 goto end; 367 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 368 S3I(s)->hs.next_state = SSL3_ST_SR_CLNT_HELLO_A; 369 370 /* HelloVerifyRequest resets Finished MAC. */ 371 tls1_transcript_reset(s); 372 break; 373 374 case SSL3_ST_SW_SRVR_HELLO_A: 375 case SSL3_ST_SW_SRVR_HELLO_B: 376 if (SSL_IS_DTLS(s)) { 377 s->internal->renegotiate = 2; 378 dtls1_start_timer(s); 379 } 380 ret = ssl3_send_server_hello(s); 381 if (ret <= 0) 382 goto end; 383 if (s->internal->hit) { 384 if (s->internal->tlsext_ticket_expected) 385 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 386 else 387 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 388 } else { 389 S3I(s)->hs.state = SSL3_ST_SW_CERT_A; 390 } 391 s->internal->init_num = 0; 392 break; 393 394 case SSL3_ST_SW_CERT_A: 395 case SSL3_ST_SW_CERT_B: 396 /* Check if it is anon DH or anon ECDH. */ 397 if (!(S3I(s)->hs.new_cipher->algorithm_auth & 398 SSL_aNULL)) { 399 if (SSL_IS_DTLS(s)) 400 dtls1_start_timer(s); 401 ret = ssl3_send_server_certificate(s); 402 if (ret <= 0) 403 goto end; 404 if (s->internal->tlsext_status_expected) 405 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_A; 406 else 407 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 408 } else { 409 skip = 1; 410 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 411 } 412 s->internal->init_num = 0; 413 break; 414 415 case SSL3_ST_SW_KEY_EXCH_A: 416 case SSL3_ST_SW_KEY_EXCH_B: 417 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 418 419 /* 420 * Only send if using a DH key exchange. 421 * 422 * For ECC ciphersuites, we send a ServerKeyExchange 423 * message only if the cipher suite is ECDHE. In other 424 * cases, the server certificate contains the server's 425 * public key for key exchange. 426 */ 427 if (alg_k & (SSL_kDHE|SSL_kECDHE)) { 428 if (SSL_IS_DTLS(s)) 429 dtls1_start_timer(s); 430 ret = ssl3_send_server_key_exchange(s); 431 if (ret <= 0) 432 goto end; 433 } else 434 skip = 1; 435 436 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_A; 437 s->internal->init_num = 0; 438 break; 439 440 case SSL3_ST_SW_CERT_REQ_A: 441 case SSL3_ST_SW_CERT_REQ_B: 442 /* 443 * Determine whether or not we need to request a 444 * certificate. 445 * 446 * Do not request a certificate if: 447 * 448 * - We did not ask for it (SSL_VERIFY_PEER is unset). 449 * 450 * - SSL_VERIFY_CLIENT_ONCE is set and we are 451 * renegotiating. 452 * 453 * - We are using an anonymous ciphersuites 454 * (see section "Certificate request" in SSL 3 drafts 455 * and in RFC 2246) ... except when the application 456 * insists on verification (against the specs, but 457 * s3_clnt.c accepts this for SSL 3). 458 */ 459 if (!(s->verify_mode & SSL_VERIFY_PEER) || 460 ((s->session->peer != NULL) && 461 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 462 ((S3I(s)->hs.new_cipher->algorithm_auth & 463 SSL_aNULL) && !(s->verify_mode & 464 SSL_VERIFY_FAIL_IF_NO_PEER_CERT))) { 465 /* No cert request. */ 466 skip = 1; 467 S3I(s)->tmp.cert_request = 0; 468 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; 469 470 if (!SSL_IS_DTLS(s)) 471 tls1_transcript_free(s); 472 } else { 473 S3I(s)->tmp.cert_request = 1; 474 if (SSL_IS_DTLS(s)) 475 dtls1_start_timer(s); 476 ret = ssl3_send_certificate_request(s); 477 if (ret <= 0) 478 goto end; 479 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_A; 480 s->internal->init_num = 0; 481 } 482 break; 483 484 case SSL3_ST_SW_SRVR_DONE_A: 485 case SSL3_ST_SW_SRVR_DONE_B: 486 if (SSL_IS_DTLS(s)) 487 dtls1_start_timer(s); 488 ret = ssl3_send_server_done(s); 489 if (ret <= 0) 490 goto end; 491 S3I(s)->hs.next_state = SSL3_ST_SR_CERT_A; 492 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 493 s->internal->init_num = 0; 494 break; 495 496 case SSL3_ST_SW_FLUSH: 497 /* 498 * This code originally checked to see if 499 * any data was pending using BIO_CTRL_INFO 500 * and then flushed. This caused problems 501 * as documented in PR#1939. The proposed 502 * fix doesn't completely resolve this issue 503 * as buggy implementations of BIO_CTRL_PENDING 504 * still exist. So instead we just flush 505 * unconditionally. 506 */ 507 s->internal->rwstate = SSL_WRITING; 508 if (BIO_flush(s->wbio) <= 0) { 509 if (SSL_IS_DTLS(s)) { 510 /* If the write error was fatal, stop trying. */ 511 if (!BIO_should_retry(s->wbio)) { 512 s->internal->rwstate = SSL_NOTHING; 513 S3I(s)->hs.state = S3I(s)->hs.next_state; 514 } 515 } 516 ret = -1; 517 goto end; 518 } 519 s->internal->rwstate = SSL_NOTHING; 520 S3I(s)->hs.state = S3I(s)->hs.next_state; 521 break; 522 523 case SSL3_ST_SR_CERT_A: 524 case SSL3_ST_SR_CERT_B: 525 if (S3I(s)->tmp.cert_request) { 526 ret = ssl3_get_client_certificate(s); 527 if (ret <= 0) 528 goto end; 529 } 530 s->internal->init_num = 0; 531 S3I(s)->hs.state = SSL3_ST_SR_KEY_EXCH_A; 532 break; 533 534 case SSL3_ST_SR_KEY_EXCH_A: 535 case SSL3_ST_SR_KEY_EXCH_B: 536 ret = ssl3_get_client_key_exchange(s); 537 if (ret <= 0) 538 goto end; 539 540 if (SSL_IS_DTLS(s)) { 541 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 542 s->internal->init_num = 0; 543 } 544 545 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 546 if (ret == 2) { 547 /* 548 * For the ECDH ciphersuites when 549 * the client sends its ECDH pub key in 550 * a certificate, the CertificateVerify 551 * message is not sent. 552 * Also for GOST ciphersuites when 553 * the client uses its key from the certificate 554 * for key exchange. 555 */ 556 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; 557 s->internal->init_num = 0; 558 } else if (SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) { 559 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 560 s->internal->init_num = 0; 561 if (!s->session->peer) 562 break; 563 /* 564 * Freeze the transcript for use during client 565 * certificate verification. 566 */ 567 tls1_transcript_freeze(s); 568 } else { 569 S3I(s)->hs.state = SSL3_ST_SR_CERT_VRFY_A; 570 s->internal->init_num = 0; 571 572 tls1_transcript_free(s); 573 574 /* 575 * We need to get hashes here so if there is 576 * a client cert, it can be verified. 577 */ 578 if (!tls1_transcript_hash_value(s, 579 S3I(s)->tmp.cert_verify_md, 580 sizeof(S3I(s)->tmp.cert_verify_md), 581 NULL)) { 582 ret = -1; 583 goto end; 584 } 585 } 586 break; 587 588 case SSL3_ST_SR_CERT_VRFY_A: 589 case SSL3_ST_SR_CERT_VRFY_B: 590 if (SSL_IS_DTLS(s)) 591 D1I(s)->change_cipher_spec_ok = 1; 592 else 593 s->s3->flags |= SSL3_FLAGS_CCS_OK; 594 595 /* we should decide if we expected this one */ 596 ret = ssl3_get_cert_verify(s); 597 if (ret <= 0) 598 goto end; 599 S3I(s)->hs.state = SSL3_ST_SR_FINISHED_A; 600 s->internal->init_num = 0; 601 break; 602 603 case SSL3_ST_SR_FINISHED_A: 604 case SSL3_ST_SR_FINISHED_B: 605 if (SSL_IS_DTLS(s)) 606 D1I(s)->change_cipher_spec_ok = 1; 607 else 608 s->s3->flags |= SSL3_FLAGS_CCS_OK; 609 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 610 SSL3_ST_SR_FINISHED_B); 611 if (ret <= 0) 612 goto end; 613 if (SSL_IS_DTLS(s)) 614 dtls1_stop_timer(s); 615 if (s->internal->hit) 616 S3I(s)->hs.state = SSL_ST_OK; 617 else if (s->internal->tlsext_ticket_expected) 618 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_A; 619 else 620 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 621 s->internal->init_num = 0; 622 break; 623 624 case SSL3_ST_SW_SESSION_TICKET_A: 625 case SSL3_ST_SW_SESSION_TICKET_B: 626 ret = ssl3_send_newsession_ticket(s); 627 if (ret <= 0) 628 goto end; 629 S3I(s)->hs.state = SSL3_ST_SW_CHANGE_A; 630 s->internal->init_num = 0; 631 break; 632 633 case SSL3_ST_SW_CERT_STATUS_A: 634 case SSL3_ST_SW_CERT_STATUS_B: 635 ret = ssl3_send_cert_status(s); 636 if (ret <= 0) 637 goto end; 638 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_A; 639 s->internal->init_num = 0; 640 break; 641 642 case SSL3_ST_SW_CHANGE_A: 643 case SSL3_ST_SW_CHANGE_B: 644 s->session->cipher = S3I(s)->hs.new_cipher; 645 if (!tls1_setup_key_block(s)) { 646 ret = -1; 647 goto end; 648 } 649 650 ret = ssl3_send_change_cipher_spec(s, 651 SSL3_ST_SW_CHANGE_A, SSL3_ST_SW_CHANGE_B); 652 if (ret <= 0) 653 goto end; 654 S3I(s)->hs.state = SSL3_ST_SW_FINISHED_A; 655 s->internal->init_num = 0; 656 657 if (!tls1_change_cipher_state(s, 658 SSL3_CHANGE_CIPHER_SERVER_WRITE)) { 659 ret = -1; 660 goto end; 661 } 662 663 if (SSL_IS_DTLS(s)) 664 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 665 break; 666 667 case SSL3_ST_SW_FINISHED_A: 668 case SSL3_ST_SW_FINISHED_B: 669 ret = ssl3_send_finished(s, 670 SSL3_ST_SW_FINISHED_A, SSL3_ST_SW_FINISHED_B, 671 TLS_MD_SERVER_FINISH_CONST, 672 TLS_MD_SERVER_FINISH_CONST_SIZE); 673 if (ret <= 0) 674 goto end; 675 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 676 if (s->internal->hit) { 677 S3I(s)->hs.next_state = SSL3_ST_SR_FINISHED_A; 678 tls1_transcript_free(s); 679 } else 680 S3I(s)->hs.next_state = SSL_ST_OK; 681 s->internal->init_num = 0; 682 break; 683 684 case SSL_ST_OK: 685 /* clean a few things up */ 686 tls1_cleanup_key_block(s); 687 688 if (S3I(s)->handshake_transcript != NULL) { 689 SSLerror(s, ERR_R_INTERNAL_ERROR); 690 ret = -1; 691 goto end; 692 } 693 694 if (!SSL_IS_DTLS(s)) { 695 BUF_MEM_free(s->internal->init_buf); 696 s->internal->init_buf = NULL; 697 } 698 699 /* remove buffering on output */ 700 ssl_free_wbio_buffer(s); 701 702 s->internal->init_num = 0; 703 704 /* Skipped if we just sent a HelloRequest. */ 705 if (s->internal->renegotiate == 2) { 706 s->internal->renegotiate = 0; 707 s->internal->new_session = 0; 708 709 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 710 711 s->ctx->internal->stats.sess_accept_good++; 712 /* s->server=1; */ 713 s->internal->handshake_func = ssl3_accept; 714 715 if (cb != NULL) 716 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 717 } 718 719 ret = 1; 720 721 if (SSL_IS_DTLS(s)) { 722 /* Done handshaking, next message is client hello. */ 723 D1I(s)->handshake_read_seq = 0; 724 /* Next message is server hello. */ 725 D1I(s)->handshake_write_seq = 0; 726 D1I(s)->next_handshake_write_seq = 0; 727 } 728 goto end; 729 /* break; */ 730 731 default: 732 SSLerror(s, SSL_R_UNKNOWN_STATE); 733 ret = -1; 734 goto end; 735 /* break; */ 736 } 737 738 if (!S3I(s)->tmp.reuse_message && !skip) { 739 if (s->internal->debug) { 740 if ((ret = BIO_flush(s->wbio)) <= 0) 741 goto end; 742 } 743 744 745 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 746 new_state = S3I(s)->hs.state; 747 S3I(s)->hs.state = state; 748 cb(s, SSL_CB_ACCEPT_LOOP, 1); 749 S3I(s)->hs.state = new_state; 750 } 751 } 752 skip = 0; 753 } 754 end: 755 /* BIO_flush(s->wbio); */ 756 s->internal->in_handshake--; 757 if (cb != NULL) 758 cb(s, SSL_CB_ACCEPT_EXIT, ret); 759 760 return (ret); 761 } 762 763 int 764 ssl3_send_hello_request(SSL *s) 765 { 766 CBB cbb, hello; 767 768 memset(&cbb, 0, sizeof(cbb)); 769 770 if (S3I(s)->hs.state == SSL3_ST_SW_HELLO_REQ_A) { 771 if (!ssl3_handshake_msg_start(s, &cbb, &hello, 772 SSL3_MT_HELLO_REQUEST)) 773 goto err; 774 if (!ssl3_handshake_msg_finish(s, &cbb)) 775 goto err; 776 777 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_B; 778 } 779 780 /* SSL3_ST_SW_HELLO_REQ_B */ 781 return (ssl3_handshake_write(s)); 782 783 err: 784 CBB_cleanup(&cbb); 785 786 return (-1); 787 } 788 789 int 790 ssl3_get_client_hello(SSL *s) 791 { 792 CBS cbs, client_random, session_id, cookie, cipher_suites; 793 CBS compression_methods; 794 uint16_t client_version; 795 uint8_t comp_method; 796 int comp_null; 797 int i, j, ok, al, ret = -1, cookie_valid = 0; 798 long n; 799 unsigned long id; 800 SSL_CIPHER *c; 801 STACK_OF(SSL_CIPHER) *ciphers = NULL; 802 unsigned long alg_k; 803 const SSL_METHOD *method; 804 uint16_t shared_version; 805 806 /* 807 * We do this so that we will respond with our native type. 808 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, 809 * This down switching should be handled by a different method. 810 * If we are SSLv3, we will respond with SSLv3, even if prompted with 811 * TLSv1. 812 */ 813 if (S3I(s)->hs.state == SSL3_ST_SR_CLNT_HELLO_A) { 814 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_B; 815 } 816 817 s->internal->first_packet = 1; 818 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, 819 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, 820 SSL3_RT_MAX_PLAIN_LENGTH, &ok); 821 if (!ok) 822 return ((int)n); 823 s->internal->first_packet = 0; 824 825 if (n < 0) 826 goto err; 827 828 CBS_init(&cbs, s->internal->init_msg, n); 829 830 /* Parse client hello up until the extensions (if any). */ 831 if (!CBS_get_u16(&cbs, &client_version)) 832 goto truncated; 833 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE)) 834 goto truncated; 835 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 836 goto truncated; 837 if (SSL_IS_DTLS(s)) { 838 if (!CBS_get_u8_length_prefixed(&cbs, &cookie)) 839 goto truncated; 840 } 841 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites)) 842 goto truncated; 843 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods)) 844 goto truncated; 845 846 /* 847 * Use version from inside client hello, not from record header. 848 * (may differ: see RFC 2246, Appendix E, second paragraph) 849 */ 850 if (ssl_max_shared_version(s, client_version, &shared_version) != 1) { 851 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER); 852 if ((s->client_version >> 8) == SSL3_VERSION_MAJOR && 853 !s->internal->enc_write_ctx && !s->internal->write_hash) { 854 /* 855 * Similar to ssl3_get_record, send alert using remote 856 * version number. 857 */ 858 s->version = s->client_version; 859 } 860 al = SSL_AD_PROTOCOL_VERSION; 861 goto f_err; 862 } 863 s->client_version = client_version; 864 s->version = shared_version; 865 866 if ((method = tls1_get_server_method(shared_version)) == NULL) 867 method = dtls1_get_server_method(shared_version); 868 if (method == NULL) { 869 SSLerror(s, ERR_R_INTERNAL_ERROR); 870 goto err; 871 } 872 s->method = method; 873 874 /* 875 * If we require cookies (DTLS) and this ClientHello does not contain 876 * one, just return since we do not want to allocate any memory yet. 877 * So check cookie length... 878 */ 879 if (SSL_IS_DTLS(s)) { 880 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 881 if (CBS_len(&cookie) == 0) 882 return (1); 883 } 884 } 885 886 if (!CBS_write_bytes(&client_random, s->s3->client_random, 887 sizeof(s->s3->client_random), NULL)) 888 goto err; 889 890 s->internal->hit = 0; 891 892 /* 893 * Versions before 0.9.7 always allow clients to resume sessions in 894 * renegotiation. 0.9.7 and later allow this by default, but optionally 895 * ignore resumption requests with flag 896 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag 897 * rather than a change to default behavior so that applications 898 * relying on this for security won't even compile against older 899 * library versions). 900 * 901 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() 902 * to request renegotiation but not a new session (s->internal->new_session 903 * remains unset): for servers, this essentially just means that the 904 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be 905 * ignored. 906 */ 907 if ((s->internal->new_session && (s->internal->options & 908 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { 909 if (!ssl_get_new_session(s, 1)) 910 goto err; 911 } else { 912 CBS ext_block; 913 914 CBS_dup(&cbs, &ext_block); 915 916 i = ssl_get_prev_session(s, &session_id, &ext_block); 917 if (i == 1) { /* previous session */ 918 s->internal->hit = 1; 919 } else if (i == -1) 920 goto err; 921 else { 922 /* i == 0 */ 923 if (!ssl_get_new_session(s, 1)) 924 goto err; 925 } 926 } 927 928 if (SSL_IS_DTLS(s)) { 929 /* 930 * The ClientHello may contain a cookie even if the HelloVerify 931 * message has not been sent - make sure that it does not cause 932 * an overflow. 933 */ 934 if (CBS_len(&cookie) > sizeof(D1I(s)->rcvd_cookie)) { 935 al = SSL_AD_DECODE_ERROR; 936 SSLerror(s, SSL_R_COOKIE_MISMATCH); 937 goto f_err; 938 } 939 940 /* Verify the cookie if appropriate option is set. */ 941 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && 942 CBS_len(&cookie) > 0) { 943 size_t cookie_len; 944 945 /* XXX - rcvd_cookie seems to only be used here... */ 946 if (!CBS_write_bytes(&cookie, D1I(s)->rcvd_cookie, 947 sizeof(D1I(s)->rcvd_cookie), &cookie_len)) 948 goto err; 949 950 if (s->ctx->internal->app_verify_cookie_cb != NULL) { 951 if (s->ctx->internal->app_verify_cookie_cb(s, 952 D1I(s)->rcvd_cookie, cookie_len) == 0) { 953 al = SSL_AD_HANDSHAKE_FAILURE; 954 SSLerror(s, SSL_R_COOKIE_MISMATCH); 955 goto f_err; 956 } 957 /* else cookie verification succeeded */ 958 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */ 959 } else if (timingsafe_memcmp(D1I(s)->rcvd_cookie, 960 D1I(s)->cookie, D1I(s)->cookie_len) != 0) { 961 /* default verification */ 962 al = SSL_AD_HANDSHAKE_FAILURE; 963 SSLerror(s, SSL_R_COOKIE_MISMATCH); 964 goto f_err; 965 } 966 cookie_valid = 1; 967 } 968 } 969 970 /* XXX - This logic seems wrong... */ 971 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) { 972 /* we need a cipher if we are not resuming a session */ 973 al = SSL_AD_ILLEGAL_PARAMETER; 974 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED); 975 goto f_err; 976 } 977 978 if (CBS_len(&cipher_suites) > 0) { 979 if ((ciphers = ssl_bytes_to_cipher_list(s, 980 &cipher_suites)) == NULL) 981 goto err; 982 } 983 984 /* If it is a hit, check that the cipher is in the list */ 985 /* XXX - CBS_len(&cipher_suites) will always be zero here... */ 986 if (s->internal->hit && CBS_len(&cipher_suites) > 0) { 987 j = 0; 988 id = s->session->cipher->id; 989 990 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 991 c = sk_SSL_CIPHER_value(ciphers, i); 992 if (c->id == id) { 993 j = 1; 994 break; 995 } 996 } 997 if (j == 0) { 998 /* 999 * We need to have the cipher in the cipher 1000 * list if we are asked to reuse it 1001 */ 1002 al = SSL_AD_ILLEGAL_PARAMETER; 1003 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING); 1004 goto f_err; 1005 } 1006 } 1007 1008 comp_null = 0; 1009 while (CBS_len(&compression_methods) > 0) { 1010 if (!CBS_get_u8(&compression_methods, &comp_method)) 1011 goto truncated; 1012 if (comp_method == 0) 1013 comp_null = 1; 1014 } 1015 if (comp_null == 0) { 1016 al = SSL_AD_DECODE_ERROR; 1017 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED); 1018 goto f_err; 1019 } 1020 1021 if (!tlsext_server_parse(s, &cbs, &al, SSL_TLSEXT_MSG_CH)) { 1022 SSLerror(s, SSL_R_PARSE_TLSEXT); 1023 goto f_err; 1024 } 1025 1026 if (!S3I(s)->renegotiate_seen && s->internal->renegotiate) { 1027 al = SSL_AD_HANDSHAKE_FAILURE; 1028 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1029 goto f_err; 1030 } 1031 1032 if (ssl_check_clienthello_tlsext_early(s) <= 0) { 1033 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1034 goto err; 1035 } 1036 1037 /* 1038 * Check if we want to use external pre-shared secret for this 1039 * handshake for not reused session only. We need to generate 1040 * server_random before calling tls_session_secret_cb in order to allow 1041 * SessionTicket processing to use it in key derivation. 1042 */ 1043 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE); 1044 1045 if (!s->internal->hit && s->internal->tls_session_secret_cb) { 1046 SSL_CIPHER *pref_cipher = NULL; 1047 1048 s->session->master_key_length = sizeof(s->session->master_key); 1049 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 1050 &s->session->master_key_length, ciphers, &pref_cipher, 1051 s->internal->tls_session_secret_cb_arg)) { 1052 s->internal->hit = 1; 1053 s->session->ciphers = ciphers; 1054 s->session->verify_result = X509_V_OK; 1055 1056 ciphers = NULL; 1057 1058 /* check if some cipher was preferred by call back */ 1059 pref_cipher = pref_cipher ? pref_cipher : 1060 ssl3_choose_cipher(s, s->session->ciphers, 1061 SSL_get_ciphers(s)); 1062 if (pref_cipher == NULL) { 1063 al = SSL_AD_HANDSHAKE_FAILURE; 1064 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1065 goto f_err; 1066 } 1067 1068 s->session->cipher = pref_cipher; 1069 1070 sk_SSL_CIPHER_free(s->cipher_list); 1071 sk_SSL_CIPHER_free(s->internal->cipher_list_by_id); 1072 1073 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); 1074 s->internal->cipher_list_by_id = 1075 sk_SSL_CIPHER_dup(s->session->ciphers); 1076 } 1077 } 1078 1079 /* 1080 * Given s->session->ciphers and SSL_get_ciphers, we must 1081 * pick a cipher 1082 */ 1083 1084 if (!s->internal->hit) { 1085 sk_SSL_CIPHER_free(s->session->ciphers); 1086 s->session->ciphers = ciphers; 1087 if (ciphers == NULL) { 1088 al = SSL_AD_ILLEGAL_PARAMETER; 1089 SSLerror(s, SSL_R_NO_CIPHERS_PASSED); 1090 goto f_err; 1091 } 1092 ciphers = NULL; 1093 c = ssl3_choose_cipher(s, s->session->ciphers, 1094 SSL_get_ciphers(s)); 1095 1096 if (c == NULL) { 1097 al = SSL_AD_HANDSHAKE_FAILURE; 1098 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1099 goto f_err; 1100 } 1101 S3I(s)->hs.new_cipher = c; 1102 } else { 1103 S3I(s)->hs.new_cipher = s->session->cipher; 1104 } 1105 1106 if (!tls1_transcript_hash_init(s)) 1107 goto err; 1108 1109 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1110 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) || 1111 !(s->verify_mode & SSL_VERIFY_PEER)) 1112 tls1_transcript_free(s); 1113 1114 /* 1115 * We now have the following setup. 1116 * client_random 1117 * cipher_list - our prefered list of ciphers 1118 * ciphers - the clients prefered list of ciphers 1119 * compression - basically ignored right now 1120 * ssl version is set - sslv3 1121 * s->session - The ssl session has been setup. 1122 * s->internal->hit - session reuse flag 1123 * s->hs.new_cipher - the new cipher to use. 1124 */ 1125 1126 /* Handles TLS extensions that we couldn't check earlier */ 1127 if (ssl_check_clienthello_tlsext_late(s) <= 0) { 1128 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1129 goto err; 1130 } 1131 1132 ret = cookie_valid ? 2 : 1; 1133 1134 if (0) { 1135 truncated: 1136 al = SSL_AD_DECODE_ERROR; 1137 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1138 f_err: 1139 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1140 } 1141 err: 1142 sk_SSL_CIPHER_free(ciphers); 1143 1144 return (ret); 1145 } 1146 1147 int 1148 ssl3_send_server_hello(SSL *s) 1149 { 1150 CBB cbb, server_hello, session_id; 1151 size_t sl; 1152 1153 memset(&cbb, 0, sizeof(cbb)); 1154 1155 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 1156 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello, 1157 SSL3_MT_SERVER_HELLO)) 1158 goto err; 1159 1160 if (!CBB_add_u16(&server_hello, s->version)) 1161 goto err; 1162 if (!CBB_add_bytes(&server_hello, s->s3->server_random, 1163 sizeof(s->s3->server_random))) 1164 goto err; 1165 1166 /* 1167 * There are several cases for the session ID to send 1168 * back in the server hello: 1169 * 1170 * - For session reuse from the session cache, 1171 * we send back the old session ID. 1172 * - If stateless session reuse (using a session ticket) 1173 * is successful, we send back the client's "session ID" 1174 * (which doesn't actually identify the session). 1175 * - If it is a new session, we send back the new 1176 * session ID. 1177 * - However, if we want the new session to be single-use, 1178 * we send back a 0-length session ID. 1179 * 1180 * s->internal->hit is non-zero in either case of session reuse, 1181 * so the following won't overwrite an ID that we're supposed 1182 * to send back. 1183 */ 1184 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER) 1185 && !s->internal->hit) 1186 s->session->session_id_length = 0; 1187 1188 sl = s->session->session_id_length; 1189 if (sl > sizeof(s->session->session_id)) { 1190 SSLerror(s, ERR_R_INTERNAL_ERROR); 1191 goto err; 1192 } 1193 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) 1194 goto err; 1195 if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) 1196 goto err; 1197 1198 /* Cipher suite. */ 1199 if (!CBB_add_u16(&server_hello, 1200 ssl3_cipher_get_value(S3I(s)->hs.new_cipher))) 1201 goto err; 1202 1203 /* Compression method (null). */ 1204 if (!CBB_add_u8(&server_hello, 0)) 1205 goto err; 1206 1207 /* TLS extensions */ 1208 if (!tlsext_server_build(s, &server_hello, SSL_TLSEXT_MSG_SH)) { 1209 SSLerror(s, ERR_R_INTERNAL_ERROR); 1210 goto err; 1211 } 1212 1213 if (!ssl3_handshake_msg_finish(s, &cbb)) 1214 goto err; 1215 } 1216 1217 /* SSL3_ST_SW_SRVR_HELLO_B */ 1218 return (ssl3_handshake_write(s)); 1219 1220 err: 1221 CBB_cleanup(&cbb); 1222 1223 return (-1); 1224 } 1225 1226 int 1227 ssl3_send_server_done(SSL *s) 1228 { 1229 CBB cbb, done; 1230 1231 memset(&cbb, 0, sizeof(cbb)); 1232 1233 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) { 1234 if (!ssl3_handshake_msg_start(s, &cbb, &done, 1235 SSL3_MT_SERVER_DONE)) 1236 goto err; 1237 if (!ssl3_handshake_msg_finish(s, &cbb)) 1238 goto err; 1239 1240 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B; 1241 } 1242 1243 /* SSL3_ST_SW_SRVR_DONE_B */ 1244 return (ssl3_handshake_write(s)); 1245 1246 err: 1247 CBB_cleanup(&cbb); 1248 1249 return (-1); 1250 } 1251 1252 static int 1253 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) 1254 { 1255 CBB dh_p, dh_g, dh_Ys; 1256 DH *dh = NULL, *dhp; 1257 unsigned char *data; 1258 int al; 1259 1260 if (s->cert->dh_tmp_auto != 0) { 1261 if ((dhp = ssl_get_auto_dh(s)) == NULL) { 1262 al = SSL_AD_INTERNAL_ERROR; 1263 SSLerror(s, ERR_R_INTERNAL_ERROR); 1264 goto f_err; 1265 } 1266 } else 1267 dhp = s->cert->dh_tmp; 1268 1269 if (dhp == NULL && s->cert->dh_tmp_cb != NULL) 1270 dhp = s->cert->dh_tmp_cb(s, 0, 1271 SSL_C_PKEYLENGTH(S3I(s)->hs.new_cipher)); 1272 1273 if (dhp == NULL) { 1274 al = SSL_AD_HANDSHAKE_FAILURE; 1275 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1276 goto f_err; 1277 } 1278 1279 if (S3I(s)->tmp.dh != NULL) { 1280 SSLerror(s, ERR_R_INTERNAL_ERROR); 1281 goto err; 1282 } 1283 1284 if (s->cert->dh_tmp_auto != 0) { 1285 dh = dhp; 1286 } else if ((dh = DHparams_dup(dhp)) == NULL) { 1287 SSLerror(s, ERR_R_DH_LIB); 1288 goto err; 1289 } 1290 S3I(s)->tmp.dh = dh; 1291 if (!DH_generate_key(dh)) { 1292 SSLerror(s, ERR_R_DH_LIB); 1293 goto err; 1294 } 1295 1296 /* 1297 * Serialize the DH parameters and public key. 1298 */ 1299 if (!CBB_add_u16_length_prefixed(cbb, &dh_p)) 1300 goto err; 1301 if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p))) 1302 goto err; 1303 BN_bn2bin(dh->p, data); 1304 1305 if (!CBB_add_u16_length_prefixed(cbb, &dh_g)) 1306 goto err; 1307 if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g))) 1308 goto err; 1309 BN_bn2bin(dh->g, data); 1310 1311 if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys)) 1312 goto err; 1313 if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key))) 1314 goto err; 1315 BN_bn2bin(dh->pub_key, data); 1316 1317 if (!CBB_flush(cbb)) 1318 goto err; 1319 1320 return (1); 1321 1322 f_err: 1323 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1324 err: 1325 return (-1); 1326 } 1327 1328 static int 1329 ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb) 1330 { 1331 const EC_GROUP *group; 1332 const EC_POINT *pubkey; 1333 unsigned char *data; 1334 int encoded_len = 0; 1335 int curve_id = 0; 1336 BN_CTX *bn_ctx = NULL; 1337 EC_KEY *ecdh; 1338 CBB ecpoint; 1339 int al; 1340 1341 /* 1342 * Only named curves are supported in ECDH ephemeral key exchanges. 1343 * For supported named curves, curve_id is non-zero. 1344 */ 1345 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1346 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1347 goto err; 1348 } 1349 1350 if (S3I(s)->tmp.ecdh != NULL) { 1351 SSLerror(s, ERR_R_INTERNAL_ERROR); 1352 goto err; 1353 } 1354 1355 if ((S3I(s)->tmp.ecdh = EC_KEY_new_by_curve_name(nid)) == NULL) { 1356 al = SSL_AD_HANDSHAKE_FAILURE; 1357 SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY); 1358 goto f_err; 1359 } 1360 ecdh = S3I(s)->tmp.ecdh; 1361 1362 if (!EC_KEY_generate_key(ecdh)) { 1363 SSLerror(s, ERR_R_ECDH_LIB); 1364 goto err; 1365 } 1366 if ((group = EC_KEY_get0_group(ecdh)) == NULL || 1367 (pubkey = EC_KEY_get0_public_key(ecdh)) == NULL || 1368 EC_KEY_get0_private_key(ecdh) == NULL) { 1369 SSLerror(s, ERR_R_ECDH_LIB); 1370 goto err; 1371 } 1372 1373 /* 1374 * Encode the public key. 1375 */ 1376 encoded_len = EC_POINT_point2oct(group, pubkey, 1377 POINT_CONVERSION_UNCOMPRESSED, NULL, 0, NULL); 1378 if (encoded_len == 0) { 1379 SSLerror(s, ERR_R_ECDH_LIB); 1380 goto err; 1381 } 1382 if ((bn_ctx = BN_CTX_new()) == NULL) { 1383 SSLerror(s, ERR_R_MALLOC_FAILURE); 1384 goto err; 1385 } 1386 1387 /* 1388 * Only named curves are supported in ECDH ephemeral key exchanges. 1389 * In this case the ServerKeyExchange message has: 1390 * [1 byte CurveType], [2 byte CurveName] 1391 * [1 byte length of encoded point], followed by 1392 * the actual encoded point itself. 1393 */ 1394 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1395 goto err; 1396 if (!CBB_add_u16(cbb, curve_id)) 1397 goto err; 1398 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1399 goto err; 1400 if (!CBB_add_space(&ecpoint, &data, encoded_len)) 1401 goto err; 1402 if (EC_POINT_point2oct(group, pubkey, POINT_CONVERSION_UNCOMPRESSED, 1403 data, encoded_len, bn_ctx) == 0) { 1404 SSLerror(s, ERR_R_ECDH_LIB); 1405 goto err; 1406 } 1407 if (!CBB_flush(cbb)) 1408 goto err; 1409 1410 BN_CTX_free(bn_ctx); 1411 1412 return (1); 1413 1414 f_err: 1415 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1416 err: 1417 BN_CTX_free(bn_ctx); 1418 1419 return (-1); 1420 } 1421 1422 static int 1423 ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb) 1424 { 1425 uint8_t *public_key = NULL; 1426 int curve_id; 1427 CBB ecpoint; 1428 int ret = -1; 1429 1430 /* Generate an X25519 key pair. */ 1431 if (S3I(s)->tmp.x25519 != NULL) { 1432 SSLerror(s, ERR_R_INTERNAL_ERROR); 1433 goto err; 1434 } 1435 if ((S3I(s)->tmp.x25519 = malloc(X25519_KEY_LENGTH)) == NULL) 1436 goto err; 1437 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 1438 goto err; 1439 X25519_keypair(public_key, S3I(s)->tmp.x25519); 1440 1441 /* Serialize public key. */ 1442 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1443 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1444 goto err; 1445 } 1446 1447 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1448 goto err; 1449 if (!CBB_add_u16(cbb, curve_id)) 1450 goto err; 1451 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1452 goto err; 1453 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 1454 goto err; 1455 if (!CBB_flush(cbb)) 1456 goto err; 1457 1458 ret = 1; 1459 1460 err: 1461 free(public_key); 1462 1463 return (ret); 1464 } 1465 1466 static int 1467 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) 1468 { 1469 int nid; 1470 1471 nid = tls1_get_shared_curve(s); 1472 1473 if (nid == NID_X25519) 1474 return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb); 1475 1476 return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb); 1477 } 1478 1479 int 1480 ssl3_send_server_key_exchange(SSL *s) 1481 { 1482 CBB cbb, cbb_params, cbb_signature, server_kex; 1483 const struct ssl_sigalg *sigalg = NULL; 1484 unsigned char *signature = NULL; 1485 size_t signature_len = 0; 1486 unsigned char *params = NULL; 1487 size_t params_len; 1488 const EVP_MD *md = NULL; 1489 unsigned long type; 1490 EVP_MD_CTX md_ctx; 1491 EVP_PKEY_CTX *pctx; 1492 EVP_PKEY *pkey; 1493 int al; 1494 1495 memset(&cbb, 0, sizeof(cbb)); 1496 memset(&cbb_params, 0, sizeof(cbb_params)); 1497 1498 EVP_MD_CTX_init(&md_ctx); 1499 1500 if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) { 1501 1502 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex, 1503 SSL3_MT_SERVER_KEY_EXCHANGE)) 1504 goto err; 1505 1506 if (!CBB_init(&cbb_params, 0)) 1507 goto err; 1508 1509 type = S3I(s)->hs.new_cipher->algorithm_mkey; 1510 if (type & SSL_kDHE) { 1511 if (ssl3_send_server_kex_dhe(s, &cbb_params) != 1) 1512 goto err; 1513 } else if (type & SSL_kECDHE) { 1514 if (ssl3_send_server_kex_ecdhe(s, &cbb_params) != 1) 1515 goto err; 1516 } else { 1517 al = SSL_AD_HANDSHAKE_FAILURE; 1518 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1519 goto f_err; 1520 } 1521 1522 if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len)) 1523 goto err; 1524 1525 if (!CBB_add_bytes(&server_kex, params, params_len)) 1526 goto err; 1527 1528 /* Add signature unless anonymous. */ 1529 if (!(S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL)) { 1530 if ((pkey = ssl_get_sign_pkey(s, S3I(s)->hs.new_cipher, 1531 &md, &sigalg)) == NULL) { 1532 al = SSL_AD_DECODE_ERROR; 1533 goto f_err; 1534 } 1535 1536 /* Send signature algorithm. */ 1537 if (SSL_USE_SIGALGS(s)) { 1538 if (!CBB_add_u16(&server_kex, sigalg->value)) { 1539 al = SSL_AD_INTERNAL_ERROR; 1540 SSLerror(s, ERR_R_INTERNAL_ERROR); 1541 goto f_err; 1542 } 1543 } 1544 1545 if (!EVP_DigestSignInit(&md_ctx, &pctx, md, NULL, pkey)) { 1546 SSLerror(s, ERR_R_EVP_LIB); 1547 goto err; 1548 } 1549 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1550 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1551 RSA_PKCS1_PSS_PADDING) || 1552 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1553 SSLerror(s, ERR_R_EVP_LIB); 1554 goto err; 1555 } 1556 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->client_random, 1557 SSL3_RANDOM_SIZE)) { 1558 SSLerror(s, ERR_R_EVP_LIB); 1559 goto err; 1560 } 1561 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->server_random, 1562 SSL3_RANDOM_SIZE)) { 1563 SSLerror(s, ERR_R_EVP_LIB); 1564 goto err; 1565 } 1566 if (!EVP_DigestSignUpdate(&md_ctx, params, params_len)) { 1567 SSLerror(s, ERR_R_EVP_LIB); 1568 goto err; 1569 } 1570 if (!EVP_DigestSignFinal(&md_ctx, NULL, &signature_len) || 1571 !signature_len) { 1572 SSLerror(s, ERR_R_EVP_LIB); 1573 goto err; 1574 } 1575 if ((signature = calloc(1, signature_len)) == NULL) { 1576 SSLerror(s, ERR_R_MALLOC_FAILURE); 1577 goto err; 1578 } 1579 if (!EVP_DigestSignFinal(&md_ctx, signature, &signature_len)) { 1580 SSLerror(s, ERR_R_EVP_LIB); 1581 goto err; 1582 } 1583 1584 if (!CBB_add_u16_length_prefixed(&server_kex, 1585 &cbb_signature)) 1586 goto err; 1587 if (!CBB_add_bytes(&cbb_signature, signature, 1588 signature_len)) 1589 goto err; 1590 } 1591 1592 if (!ssl3_handshake_msg_finish(s, &cbb)) 1593 goto err; 1594 1595 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1596 } 1597 1598 EVP_MD_CTX_cleanup(&md_ctx); 1599 free(params); 1600 free(signature); 1601 1602 return (ssl3_handshake_write(s)); 1603 1604 f_err: 1605 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1606 err: 1607 CBB_cleanup(&cbb_params); 1608 CBB_cleanup(&cbb); 1609 EVP_MD_CTX_cleanup(&md_ctx); 1610 free(params); 1611 free(signature); 1612 1613 return (-1); 1614 } 1615 1616 int 1617 ssl3_send_certificate_request(SSL *s) 1618 { 1619 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1620 STACK_OF(X509_NAME) *sk = NULL; 1621 X509_NAME *name; 1622 int i; 1623 1624 /* 1625 * Certificate Request - RFC 5246 section 7.4.4. 1626 */ 1627 1628 memset(&cbb, 0, sizeof(cbb)); 1629 1630 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1631 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, 1632 SSL3_MT_CERTIFICATE_REQUEST)) 1633 goto err; 1634 1635 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1636 goto err; 1637 if (!ssl3_get_req_cert_types(s, &cert_types)) 1638 goto err; 1639 1640 if (SSL_USE_SIGALGS(s)) { 1641 if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs)) 1642 goto err; 1643 if (!ssl_sigalgs_build(&sigalgs, tls12_sigalgs, tls12_sigalgs_len)) 1644 goto err; 1645 } 1646 1647 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) 1648 goto err; 1649 1650 sk = SSL_get_client_CA_list(s); 1651 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1652 unsigned char *name_data; 1653 size_t name_len; 1654 1655 name = sk_X509_NAME_value(sk, i); 1656 name_len = i2d_X509_NAME(name, NULL); 1657 1658 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) 1659 goto err; 1660 if (!CBB_add_space(&dn, &name_data, name_len)) 1661 goto err; 1662 if (i2d_X509_NAME(name, &name_data) != name_len) 1663 goto err; 1664 } 1665 1666 if (!ssl3_handshake_msg_finish(s, &cbb)) 1667 goto err; 1668 1669 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B; 1670 } 1671 1672 /* SSL3_ST_SW_CERT_REQ_B */ 1673 return (ssl3_handshake_write(s)); 1674 1675 err: 1676 CBB_cleanup(&cbb); 1677 1678 return (-1); 1679 } 1680 1681 static int 1682 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs) 1683 { 1684 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; 1685 unsigned char *pms = NULL; 1686 unsigned char *p; 1687 size_t pms_len = 0; 1688 EVP_PKEY *pkey = NULL; 1689 RSA *rsa = NULL; 1690 CBS enc_pms; 1691 int decrypt_len; 1692 int al = -1; 1693 1694 arc4random_buf(fakekey, sizeof(fakekey)); 1695 fakekey[0] = s->client_version >> 8; 1696 fakekey[1] = s->client_version & 0xff; 1697 1698 pkey = s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey; 1699 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || 1700 (pkey->pkey.rsa == NULL)) { 1701 al = SSL_AD_HANDSHAKE_FAILURE; 1702 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); 1703 goto f_err; 1704 } 1705 rsa = pkey->pkey.rsa; 1706 1707 pms_len = RSA_size(rsa); 1708 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH) 1709 goto err; 1710 if ((pms = malloc(pms_len)) == NULL) 1711 goto err; 1712 p = pms; 1713 1714 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms)) 1715 goto truncated; 1716 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) { 1717 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1718 goto err; 1719 } 1720 1721 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms), 1722 pms, rsa, RSA_PKCS1_PADDING); 1723 1724 ERR_clear_error(); 1725 1726 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) { 1727 al = SSL_AD_DECODE_ERROR; 1728 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ 1729 } 1730 1731 if ((al == -1) && !((pms[0] == (s->client_version >> 8)) && 1732 (pms[1] == (s->client_version & 0xff)))) { 1733 /* 1734 * The premaster secret must contain the same version number 1735 * as the ClientHello to detect version rollback attacks 1736 * (strangely, the protocol does not offer such protection for 1737 * DH ciphersuites). 1738 * 1739 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack 1740 * (http://eprint.iacr.org/2003/052/) exploits the version 1741 * number check as a "bad version oracle" -- an alert would 1742 * reveal that the plaintext corresponding to some ciphertext 1743 * made up by the adversary is properly formatted except that 1744 * the version number is wrong. To avoid such attacks, we should 1745 * treat this just like any other decryption error. 1746 */ 1747 al = SSL_AD_DECODE_ERROR; 1748 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ 1749 } 1750 1751 if (al != -1) { 1752 /* 1753 * Some decryption failure -- use random value instead 1754 * as countermeasure against Bleichenbacher's attack 1755 * on PKCS #1 v1.5 RSA padding (see RFC 2246, 1756 * section 7.4.7.1). 1757 */ 1758 p = fakekey; 1759 } 1760 1761 s->session->master_key_length = 1762 tls1_generate_master_secret(s, 1763 s->session->master_key, p, SSL_MAX_MASTER_KEY_LENGTH); 1764 1765 freezero(pms, pms_len); 1766 1767 return (1); 1768 1769 truncated: 1770 al = SSL_AD_DECODE_ERROR; 1771 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1772 f_err: 1773 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1774 err: 1775 freezero(pms, pms_len); 1776 1777 return (-1); 1778 } 1779 1780 static int 1781 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) 1782 { 1783 int key_size = 0, key_len, al; 1784 unsigned char *key = NULL; 1785 BIGNUM *bn = NULL; 1786 CBS dh_Yc; 1787 DH *dh; 1788 1789 if (!CBS_get_u16_length_prefixed(cbs, &dh_Yc)) 1790 goto truncated; 1791 if (CBS_len(cbs) != 0) 1792 goto truncated; 1793 1794 if (S3I(s)->tmp.dh == NULL) { 1795 al = SSL_AD_HANDSHAKE_FAILURE; 1796 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1797 goto f_err; 1798 } 1799 dh = S3I(s)->tmp.dh; 1800 1801 if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) { 1802 SSLerror(s, SSL_R_BN_LIB); 1803 goto err; 1804 } 1805 1806 if ((key_size = DH_size(dh)) <= 0) { 1807 SSLerror(s, ERR_R_DH_LIB); 1808 goto err; 1809 } 1810 if ((key = malloc(key_size)) == NULL) { 1811 SSLerror(s, ERR_R_MALLOC_FAILURE); 1812 goto err; 1813 } 1814 if ((key_len = DH_compute_key(key, bn, dh)) <= 0) { 1815 SSLerror(s, ERR_R_DH_LIB); 1816 goto err; 1817 } 1818 1819 s->session->master_key_length = tls1_generate_master_secret(s, 1820 s->session->master_key, key, key_len); 1821 1822 DH_free(S3I(s)->tmp.dh); 1823 S3I(s)->tmp.dh = NULL; 1824 1825 freezero(key, key_size); 1826 BN_clear_free(bn); 1827 1828 return (1); 1829 1830 truncated: 1831 al = SSL_AD_DECODE_ERROR; 1832 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1833 f_err: 1834 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1835 err: 1836 freezero(key, key_size); 1837 BN_clear_free(bn); 1838 1839 return (-1); 1840 } 1841 1842 static int 1843 ssl3_get_client_kex_ecdhe_ecp(SSL *s, CBS *cbs) 1844 { 1845 unsigned char *key = NULL; 1846 int key_size = 0, key_len; 1847 EC_POINT *point = NULL; 1848 BN_CTX *bn_ctx = NULL; 1849 const EC_GROUP *group; 1850 EC_KEY *ecdh; 1851 CBS public; 1852 int ret = -1; 1853 1854 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1855 goto err; 1856 if (CBS_len(cbs) != 0) 1857 goto err; 1858 1859 /* 1860 * Use the ephemeral values we saved when generating the 1861 * ServerKeyExchange message. 1862 */ 1863 if ((ecdh = S3I(s)->tmp.ecdh) == NULL) { 1864 SSLerror(s, ERR_R_INTERNAL_ERROR); 1865 goto err; 1866 } 1867 group = EC_KEY_get0_group(ecdh); 1868 1869 /* 1870 * Get client's public key from encoded point in the ClientKeyExchange 1871 * message. 1872 */ 1873 if ((bn_ctx = BN_CTX_new()) == NULL) { 1874 SSLerror(s, ERR_R_MALLOC_FAILURE); 1875 goto err; 1876 } 1877 if ((point = EC_POINT_new(group)) == NULL) { 1878 SSLerror(s, ERR_R_MALLOC_FAILURE); 1879 goto err; 1880 } 1881 if (EC_POINT_oct2point(group, point, CBS_data(&public), 1882 CBS_len(&public), bn_ctx) == 0) { 1883 SSLerror(s, ERR_R_EC_LIB); 1884 goto err; 1885 } 1886 1887 /* Compute the shared pre-master secret */ 1888 if ((key_size = ECDH_size(ecdh)) <= 0) { 1889 SSLerror(s, ERR_R_ECDH_LIB); 1890 goto err; 1891 } 1892 if ((key = malloc(key_size)) == NULL) { 1893 SSLerror(s, ERR_R_MALLOC_FAILURE); 1894 goto err; 1895 } 1896 if ((key_len = ECDH_compute_key(key, key_size, point, ecdh, 1897 NULL)) <= 0) { 1898 SSLerror(s, ERR_R_ECDH_LIB); 1899 goto err; 1900 } 1901 1902 /* Compute the master secret */ 1903 s->session->master_key_length = tls1_generate_master_secret(s, 1904 s->session->master_key, key, key_len); 1905 1906 EC_KEY_free(S3I(s)->tmp.ecdh); 1907 S3I(s)->tmp.ecdh = NULL; 1908 1909 ret = 1; 1910 1911 err: 1912 freezero(key, key_size); 1913 EC_POINT_free(point); 1914 BN_CTX_free(bn_ctx); 1915 1916 return (ret); 1917 } 1918 1919 static int 1920 ssl3_get_client_kex_ecdhe_ecx(SSL *s, CBS *cbs) 1921 { 1922 uint8_t *shared_key = NULL; 1923 CBS ecpoint; 1924 int ret = -1; 1925 1926 if (!CBS_get_u8_length_prefixed(cbs, &ecpoint)) 1927 goto err; 1928 if (CBS_len(cbs) != 0) 1929 goto err; 1930 if (CBS_len(&ecpoint) != X25519_KEY_LENGTH) 1931 goto err; 1932 1933 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 1934 goto err; 1935 if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint))) 1936 goto err; 1937 1938 freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH); 1939 S3I(s)->tmp.x25519 = NULL; 1940 1941 s->session->master_key_length = 1942 tls1_generate_master_secret( 1943 s, s->session->master_key, shared_key, X25519_KEY_LENGTH); 1944 1945 ret = 1; 1946 1947 err: 1948 freezero(shared_key, X25519_KEY_LENGTH); 1949 1950 return (ret); 1951 } 1952 1953 static int 1954 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) 1955 { 1956 if (S3I(s)->tmp.x25519 != NULL) 1957 return ssl3_get_client_kex_ecdhe_ecx(s, cbs); 1958 1959 return ssl3_get_client_kex_ecdhe_ecp(s, cbs); 1960 } 1961 1962 static int 1963 ssl3_get_client_kex_gost(SSL *s, CBS *cbs) 1964 { 1965 EVP_PKEY_CTX *pkey_ctx; 1966 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; 1967 unsigned char premaster_secret[32]; 1968 unsigned long alg_a; 1969 size_t outlen = 32; 1970 CBS gostblob; 1971 int al; 1972 int ret = 0; 1973 1974 /* Get our certificate private key*/ 1975 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1976 if (alg_a & SSL_aGOST01) 1977 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 1978 1979 if ((pkey_ctx = EVP_PKEY_CTX_new(pk, NULL)) == NULL) 1980 goto err; 1981 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) 1982 goto gerr; 1983 1984 /* 1985 * If client certificate is present and is of the same type, 1986 * maybe use it for key exchange. 1987 * Don't mind errors from EVP_PKEY_derive_set_peer, because 1988 * it is completely valid to use a client certificate for 1989 * authorization only. 1990 */ 1991 if ((client_pub_pkey = X509_get_pubkey(s->session->peer)) != NULL) { 1992 if (EVP_PKEY_derive_set_peer(pkey_ctx, 1993 client_pub_pkey) <= 0) 1994 ERR_clear_error(); 1995 } 1996 1997 /* Decrypt session key */ 1998 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) 1999 goto truncated; 2000 if (CBS_len(cbs) != 0) 2001 goto truncated; 2002 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 2003 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { 2004 SSLerror(s, SSL_R_DECRYPTION_FAILED); 2005 goto gerr; 2006 } 2007 2008 /* Generate master secret */ 2009 s->session->master_key_length = 2010 tls1_generate_master_secret( 2011 s, s->session->master_key, premaster_secret, 32); 2012 2013 /* Check if pubkey from client certificate was used */ 2014 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, 2015 EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) 2016 ret = 2; 2017 else 2018 ret = 1; 2019 gerr: 2020 EVP_PKEY_free(client_pub_pkey); 2021 EVP_PKEY_CTX_free(pkey_ctx); 2022 if (ret) 2023 return (ret); 2024 else 2025 goto err; 2026 2027 truncated: 2028 al = SSL_AD_DECODE_ERROR; 2029 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2030 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2031 err: 2032 return (-1); 2033 } 2034 2035 int 2036 ssl3_get_client_key_exchange(SSL *s) 2037 { 2038 unsigned long alg_k; 2039 int al, ok; 2040 CBS cbs; 2041 long n; 2042 2043 /* 2048 maxlen is a guess. How long a key does that permit? */ 2044 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 2045 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok); 2046 if (!ok) 2047 return ((int)n); 2048 2049 if (n < 0) 2050 goto err; 2051 2052 CBS_init(&cbs, s->internal->init_msg, n); 2053 2054 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2055 2056 if (alg_k & SSL_kRSA) { 2057 if (ssl3_get_client_kex_rsa(s, &cbs) != 1) 2058 goto err; 2059 } else if (alg_k & SSL_kDHE) { 2060 if (ssl3_get_client_kex_dhe(s, &cbs) != 1) 2061 goto err; 2062 } else if (alg_k & SSL_kECDHE) { 2063 if (ssl3_get_client_kex_ecdhe(s, &cbs) != 1) 2064 goto err; 2065 } else if (alg_k & SSL_kGOST) { 2066 if (ssl3_get_client_kex_gost(s, &cbs) != 1) 2067 goto err; 2068 } else { 2069 al = SSL_AD_HANDSHAKE_FAILURE; 2070 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 2071 goto f_err; 2072 } 2073 2074 if (CBS_len(&cbs) != 0) { 2075 al = SSL_AD_DECODE_ERROR; 2076 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2077 goto f_err; 2078 } 2079 2080 return (1); 2081 2082 f_err: 2083 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2084 err: 2085 return (-1); 2086 } 2087 2088 int 2089 ssl3_get_cert_verify(SSL *s) 2090 { 2091 CBS cbs, signature; 2092 const struct ssl_sigalg *sigalg = NULL; 2093 const EVP_MD *md = NULL; 2094 EVP_PKEY *pkey = NULL; 2095 X509 *peer = NULL; 2096 EVP_MD_CTX mctx; 2097 int al, ok, verify; 2098 const unsigned char *hdata; 2099 size_t hdatalen; 2100 int type = 0; 2101 int ret = 0; 2102 long n; 2103 2104 EVP_MD_CTX_init(&mctx); 2105 2106 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 2107 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok); 2108 if (!ok) 2109 return ((int)n); 2110 2111 if (n < 0) 2112 goto err; 2113 2114 CBS_init(&cbs, s->internal->init_msg, n); 2115 2116 if (s->session->peer != NULL) { 2117 peer = s->session->peer; 2118 pkey = X509_get_pubkey(peer); 2119 type = X509_certificate_type(peer, pkey); 2120 } 2121 2122 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 2123 S3I(s)->tmp.reuse_message = 1; 2124 if (peer != NULL) { 2125 al = SSL_AD_UNEXPECTED_MESSAGE; 2126 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 2127 goto f_err; 2128 } 2129 ret = 1; 2130 goto end; 2131 } 2132 2133 if (peer == NULL) { 2134 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 2135 al = SSL_AD_UNEXPECTED_MESSAGE; 2136 goto f_err; 2137 } 2138 2139 if (!(type & EVP_PKT_SIGN)) { 2140 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 2141 al = SSL_AD_ILLEGAL_PARAMETER; 2142 goto f_err; 2143 } 2144 2145 if (S3I(s)->change_cipher_spec) { 2146 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 2147 al = SSL_AD_UNEXPECTED_MESSAGE; 2148 goto f_err; 2149 } 2150 2151 if (!SSL_USE_SIGALGS(s)) { 2152 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2153 goto err; 2154 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2155 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2156 al = SSL_AD_DECODE_ERROR; 2157 goto f_err; 2158 } 2159 if (CBS_len(&cbs) != 0) { 2160 al = SSL_AD_DECODE_ERROR; 2161 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2162 goto f_err; 2163 } 2164 } 2165 2166 if (SSL_USE_SIGALGS(s)) { 2167 EVP_PKEY_CTX *pctx; 2168 uint16_t sigalg_value; 2169 2170 if (!CBS_get_u16(&cbs, &sigalg_value)) 2171 goto truncated; 2172 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 2173 tls12_sigalgs_len)) == NULL || 2174 (md = sigalg->md()) == NULL) { 2175 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2176 al = SSL_AD_DECODE_ERROR; 2177 goto f_err; 2178 } 2179 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 2180 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 2181 al = SSL_AD_DECODE_ERROR; 2182 goto f_err; 2183 } 2184 2185 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2186 goto err; 2187 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2188 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2189 al = SSL_AD_DECODE_ERROR; 2190 goto f_err; 2191 } 2192 if (CBS_len(&cbs) != 0) { 2193 al = SSL_AD_DECODE_ERROR; 2194 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2195 goto f_err; 2196 } 2197 2198 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2199 SSLerror(s, ERR_R_INTERNAL_ERROR); 2200 al = SSL_AD_INTERNAL_ERROR; 2201 goto f_err; 2202 } 2203 if (!EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, pkey)) { 2204 SSLerror(s, ERR_R_EVP_LIB); 2205 al = SSL_AD_INTERNAL_ERROR; 2206 goto f_err; 2207 } 2208 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2209 (!EVP_PKEY_CTX_set_rsa_padding 2210 (pctx, RSA_PKCS1_PSS_PADDING) || 2211 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2212 al = SSL_AD_INTERNAL_ERROR; 2213 goto f_err; 2214 } 2215 if (!EVP_DigestVerifyUpdate(&mctx, hdata, hdatalen)) { 2216 SSLerror(s, ERR_R_EVP_LIB); 2217 al = SSL_AD_INTERNAL_ERROR; 2218 goto f_err; 2219 } 2220 if (EVP_DigestVerifyFinal(&mctx, CBS_data(&signature), 2221 CBS_len(&signature)) <= 0) { 2222 al = SSL_AD_DECRYPT_ERROR; 2223 SSLerror(s, SSL_R_BAD_SIGNATURE); 2224 goto f_err; 2225 } 2226 } else if (pkey->type == EVP_PKEY_RSA) { 2227 verify = RSA_verify(NID_md5_sha1, S3I(s)->tmp.cert_verify_md, 2228 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), 2229 CBS_len(&signature), pkey->pkey.rsa); 2230 if (verify < 0) { 2231 al = SSL_AD_DECRYPT_ERROR; 2232 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2233 goto f_err; 2234 } 2235 if (verify == 0) { 2236 al = SSL_AD_DECRYPT_ERROR; 2237 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2238 goto f_err; 2239 } 2240 } else if (pkey->type == EVP_PKEY_EC) { 2241 verify = ECDSA_verify(pkey->save_type, 2242 &(S3I(s)->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), 2243 SHA_DIGEST_LENGTH, CBS_data(&signature), 2244 CBS_len(&signature), pkey->pkey.ec); 2245 if (verify <= 0) { 2246 al = SSL_AD_DECRYPT_ERROR; 2247 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2248 goto f_err; 2249 } 2250 #ifndef OPENSSL_NO_GOST 2251 } else if (pkey->type == NID_id_GostR3410_94 || 2252 pkey->type == NID_id_GostR3410_2001) { 2253 unsigned char sigbuf[128]; 2254 unsigned int siglen = sizeof(sigbuf); 2255 EVP_PKEY_CTX *pctx; 2256 int nid; 2257 2258 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2259 SSLerror(s, ERR_R_INTERNAL_ERROR); 2260 al = SSL_AD_INTERNAL_ERROR; 2261 goto f_err; 2262 } 2263 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2264 !(md = EVP_get_digestbynid(nid))) { 2265 SSLerror(s, ERR_R_EVP_LIB); 2266 al = SSL_AD_INTERNAL_ERROR; 2267 goto f_err; 2268 } 2269 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 2270 SSLerror(s, ERR_R_EVP_LIB); 2271 al = SSL_AD_INTERNAL_ERROR; 2272 goto f_err; 2273 } 2274 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2275 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2276 !EVP_DigestFinal(&mctx, sigbuf, &siglen) || 2277 (EVP_PKEY_verify_init(pctx) <= 0) || 2278 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2279 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2280 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2281 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { 2282 SSLerror(s, ERR_R_EVP_LIB); 2283 al = SSL_AD_INTERNAL_ERROR; 2284 EVP_PKEY_CTX_free(pctx); 2285 goto f_err; 2286 } 2287 if (EVP_PKEY_verify(pctx, CBS_data(&signature), 2288 CBS_len(&signature), sigbuf, siglen) <= 0) { 2289 al = SSL_AD_DECRYPT_ERROR; 2290 SSLerror(s, SSL_R_BAD_SIGNATURE); 2291 EVP_PKEY_CTX_free(pctx); 2292 goto f_err; 2293 } 2294 2295 EVP_PKEY_CTX_free(pctx); 2296 #endif 2297 } else { 2298 SSLerror(s, ERR_R_INTERNAL_ERROR); 2299 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2300 goto f_err; 2301 } 2302 2303 ret = 1; 2304 if (0) { 2305 truncated: 2306 al = SSL_AD_DECODE_ERROR; 2307 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2308 f_err: 2309 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2310 } 2311 end: 2312 tls1_transcript_free(s); 2313 err: 2314 EVP_MD_CTX_cleanup(&mctx); 2315 EVP_PKEY_free(pkey); 2316 return (ret); 2317 } 2318 2319 int 2320 ssl3_get_client_certificate(SSL *s) 2321 { 2322 CBS cbs, client_certs; 2323 int i, ok, al, ret = -1; 2324 X509 *x = NULL; 2325 long n; 2326 const unsigned char *q; 2327 STACK_OF(X509) *sk = NULL; 2328 2329 n = s->method->internal->ssl_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2330 -1, s->internal->max_cert_list, &ok); 2331 2332 if (!ok) 2333 return ((int)n); 2334 2335 if (S3I(s)->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2336 if ((s->verify_mode & SSL_VERIFY_PEER) && 2337 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2338 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2339 al = SSL_AD_HANDSHAKE_FAILURE; 2340 goto f_err; 2341 } 2342 /* 2343 * If tls asked for a client cert, 2344 * the client must return a 0 list. 2345 */ 2346 if (S3I(s)->tmp.cert_request) { 2347 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 2348 ); 2349 al = SSL_AD_UNEXPECTED_MESSAGE; 2350 goto f_err; 2351 } 2352 S3I(s)->tmp.reuse_message = 1; 2353 return (1); 2354 } 2355 2356 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 2357 al = SSL_AD_UNEXPECTED_MESSAGE; 2358 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2359 goto f_err; 2360 } 2361 2362 if (n < 0) 2363 goto truncated; 2364 2365 CBS_init(&cbs, s->internal->init_msg, n); 2366 2367 if ((sk = sk_X509_new_null()) == NULL) { 2368 SSLerror(s, ERR_R_MALLOC_FAILURE); 2369 goto err; 2370 } 2371 2372 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) || 2373 CBS_len(&cbs) != 0) 2374 goto truncated; 2375 2376 while (CBS_len(&client_certs) > 0) { 2377 CBS cert; 2378 2379 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) { 2380 al = SSL_AD_DECODE_ERROR; 2381 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2382 goto f_err; 2383 } 2384 2385 q = CBS_data(&cert); 2386 x = d2i_X509(NULL, &q, CBS_len(&cert)); 2387 if (x == NULL) { 2388 SSLerror(s, ERR_R_ASN1_LIB); 2389 goto err; 2390 } 2391 if (q != CBS_data(&cert) + CBS_len(&cert)) { 2392 al = SSL_AD_DECODE_ERROR; 2393 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2394 goto f_err; 2395 } 2396 if (!sk_X509_push(sk, x)) { 2397 SSLerror(s, ERR_R_MALLOC_FAILURE); 2398 goto err; 2399 } 2400 x = NULL; 2401 } 2402 2403 if (sk_X509_num(sk) <= 0) { 2404 /* 2405 * TLS does not mind 0 certs returned. 2406 * Fail for TLS only if we required a certificate. 2407 */ 2408 if ((s->verify_mode & SSL_VERIFY_PEER) && 2409 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2410 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2411 al = SSL_AD_HANDSHAKE_FAILURE; 2412 goto f_err; 2413 } 2414 /* No client certificate so free transcript. */ 2415 tls1_transcript_free(s); 2416 } else { 2417 i = ssl_verify_cert_chain(s, sk); 2418 if (i <= 0) { 2419 al = ssl_verify_alarm_type(s->verify_result); 2420 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2421 goto f_err; 2422 } 2423 } 2424 2425 X509_free(s->session->peer); 2426 s->session->peer = sk_X509_shift(sk); 2427 s->session->verify_result = s->verify_result; 2428 2429 /* 2430 * With the current implementation, sess_cert will always be NULL 2431 * when we arrive here 2432 */ 2433 if (SSI(s)->sess_cert == NULL) { 2434 SSI(s)->sess_cert = ssl_sess_cert_new(); 2435 if (SSI(s)->sess_cert == NULL) { 2436 SSLerror(s, ERR_R_MALLOC_FAILURE); 2437 goto err; 2438 } 2439 } 2440 sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free); 2441 SSI(s)->sess_cert->cert_chain = sk; 2442 2443 /* 2444 * Inconsistency alert: cert_chain does *not* include the 2445 * peer's own certificate, while we do include it in s3_clnt.c 2446 */ 2447 2448 sk = NULL; 2449 2450 ret = 1; 2451 if (0) { 2452 truncated: 2453 al = SSL_AD_DECODE_ERROR; 2454 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2455 f_err: 2456 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2457 } 2458 err: 2459 X509_free(x); 2460 sk_X509_pop_free(sk, X509_free); 2461 2462 return (ret); 2463 } 2464 2465 int 2466 ssl3_send_server_certificate(SSL *s) 2467 { 2468 CBB cbb, server_cert; 2469 CERT_PKEY *cpk; 2470 2471 /* 2472 * Server Certificate - RFC 5246, section 7.4.2. 2473 */ 2474 2475 memset(&cbb, 0, sizeof(cbb)); 2476 2477 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) { 2478 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { 2479 SSLerror(s, ERR_R_INTERNAL_ERROR); 2480 return (0); 2481 } 2482 2483 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, 2484 SSL3_MT_CERTIFICATE)) 2485 goto err; 2486 if (!ssl3_output_cert_chain(s, &server_cert, cpk)) 2487 goto err; 2488 if (!ssl3_handshake_msg_finish(s, &cbb)) 2489 goto err; 2490 2491 S3I(s)->hs.state = SSL3_ST_SW_CERT_B; 2492 } 2493 2494 /* SSL3_ST_SW_CERT_B */ 2495 return (ssl3_handshake_write(s)); 2496 2497 err: 2498 CBB_cleanup(&cbb); 2499 2500 return (0); 2501 } 2502 2503 /* send a new session ticket (not necessarily for a new session) */ 2504 int 2505 ssl3_send_newsession_ticket(SSL *s) 2506 { 2507 CBB cbb, session_ticket, ticket; 2508 SSL_CTX *tctx = s->initial_ctx; 2509 size_t enc_session_len, enc_session_max_len, hmac_len; 2510 size_t session_len = 0; 2511 unsigned char *enc_session = NULL, *session = NULL; 2512 unsigned char iv[EVP_MAX_IV_LENGTH]; 2513 unsigned char key_name[16]; 2514 unsigned char *hmac; 2515 unsigned int hlen; 2516 EVP_CIPHER_CTX ctx; 2517 HMAC_CTX hctx; 2518 int len; 2519 2520 /* 2521 * New Session Ticket - RFC 5077, section 3.3. 2522 */ 2523 2524 EVP_CIPHER_CTX_init(&ctx); 2525 HMAC_CTX_init(&hctx); 2526 2527 memset(&cbb, 0, sizeof(cbb)); 2528 2529 if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2530 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, 2531 SSL3_MT_NEWSESSION_TICKET)) 2532 goto err; 2533 2534 if (!SSL_SESSION_ticket(s->session, &session, &session_len)) 2535 goto err; 2536 if (session_len > 0xffff) 2537 goto err; 2538 2539 /* 2540 * Initialize HMAC and cipher contexts. If callback is present 2541 * it does all the work, otherwise use generated values from 2542 * parent context. 2543 */ 2544 if (tctx->internal->tlsext_ticket_key_cb != NULL) { 2545 if (tctx->internal->tlsext_ticket_key_cb(s, 2546 key_name, iv, &ctx, &hctx, 1) < 0) { 2547 EVP_CIPHER_CTX_cleanup(&ctx); 2548 goto err; 2549 } 2550 } else { 2551 arc4random_buf(iv, 16); 2552 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 2553 tctx->internal->tlsext_tick_aes_key, iv); 2554 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key, 2555 16, EVP_sha256(), NULL); 2556 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); 2557 } 2558 2559 /* Encrypt the session state. */ 2560 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; 2561 if ((enc_session = calloc(1, enc_session_max_len)) == NULL) 2562 goto err; 2563 enc_session_len = 0; 2564 if (!EVP_EncryptUpdate(&ctx, enc_session, &len, session, 2565 session_len)) 2566 goto err; 2567 enc_session_len += len; 2568 if (!EVP_EncryptFinal_ex(&ctx, enc_session + enc_session_len, 2569 &len)) 2570 goto err; 2571 enc_session_len += len; 2572 2573 if (enc_session_len > enc_session_max_len) 2574 goto err; 2575 2576 /* Generate the HMAC. */ 2577 if (!HMAC_Update(&hctx, key_name, sizeof(key_name))) 2578 goto err; 2579 if (!HMAC_Update(&hctx, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2580 goto err; 2581 if (!HMAC_Update(&hctx, enc_session, enc_session_len)) 2582 goto err; 2583 2584 if ((hmac_len = HMAC_size(&hctx)) <= 0) 2585 goto err; 2586 2587 /* 2588 * Ticket lifetime hint (advisory only): 2589 * We leave this unspecified for resumed session 2590 * (for simplicity), and guess that tickets for new 2591 * sessions will live as long as their sessions. 2592 */ 2593 if (!CBB_add_u32(&session_ticket, 2594 s->internal->hit ? 0 : s->session->timeout)) 2595 goto err; 2596 2597 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) 2598 goto err; 2599 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) 2600 goto err; 2601 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2602 goto err; 2603 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) 2604 goto err; 2605 if (!CBB_add_space(&ticket, &hmac, hmac_len)) 2606 goto err; 2607 2608 if (!HMAC_Final(&hctx, hmac, &hlen)) 2609 goto err; 2610 if (hlen != hmac_len) 2611 goto err; 2612 2613 if (!ssl3_handshake_msg_finish(s, &cbb)) 2614 goto err; 2615 2616 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2617 } 2618 2619 EVP_CIPHER_CTX_cleanup(&ctx); 2620 HMAC_CTX_cleanup(&hctx); 2621 freezero(session, session_len); 2622 free(enc_session); 2623 2624 /* SSL3_ST_SW_SESSION_TICKET_B */ 2625 return (ssl3_handshake_write(s)); 2626 2627 err: 2628 CBB_cleanup(&cbb); 2629 EVP_CIPHER_CTX_cleanup(&ctx); 2630 HMAC_CTX_cleanup(&hctx); 2631 freezero(session, session_len); 2632 free(enc_session); 2633 2634 return (-1); 2635 } 2636 2637 int 2638 ssl3_send_cert_status(SSL *s) 2639 { 2640 CBB cbb, certstatus, ocspresp; 2641 2642 memset(&cbb, 0, sizeof(cbb)); 2643 2644 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2645 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, 2646 SSL3_MT_CERTIFICATE_STATUS)) 2647 goto err; 2648 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2649 goto err; 2650 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2651 goto err; 2652 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, 2653 s->internal->tlsext_ocsp_resplen)) 2654 goto err; 2655 if (!ssl3_handshake_msg_finish(s, &cbb)) 2656 goto err; 2657 2658 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2659 } 2660 2661 /* SSL3_ST_SW_CERT_STATUS_B */ 2662 return (ssl3_handshake_write(s)); 2663 2664 err: 2665 CBB_cleanup(&cbb); 2666 2667 return (-1); 2668 } 2669