1 /* $OpenBSD: ssl_srvr.c,v 1.85 2020/09/24 18:12:00 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 ssl3_release_init_buffer(s); 696 697 /* remove buffering on output */ 698 ssl_free_wbio_buffer(s); 699 700 s->internal->init_num = 0; 701 702 /* Skipped if we just sent a HelloRequest. */ 703 if (s->internal->renegotiate == 2) { 704 s->internal->renegotiate = 0; 705 s->internal->new_session = 0; 706 707 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 708 709 s->ctx->internal->stats.sess_accept_good++; 710 /* s->server=1; */ 711 s->internal->handshake_func = ssl3_accept; 712 713 if (cb != NULL) 714 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 715 } 716 717 ret = 1; 718 719 if (SSL_IS_DTLS(s)) { 720 /* Done handshaking, next message is client hello. */ 721 D1I(s)->handshake_read_seq = 0; 722 /* Next message is server hello. */ 723 D1I(s)->handshake_write_seq = 0; 724 D1I(s)->next_handshake_write_seq = 0; 725 } 726 goto end; 727 /* break; */ 728 729 default: 730 SSLerror(s, SSL_R_UNKNOWN_STATE); 731 ret = -1; 732 goto end; 733 /* break; */ 734 } 735 736 if (!S3I(s)->tmp.reuse_message && !skip) { 737 if (s->internal->debug) { 738 if ((ret = BIO_flush(s->wbio)) <= 0) 739 goto end; 740 } 741 742 743 if ((cb != NULL) && (S3I(s)->hs.state != state)) { 744 new_state = S3I(s)->hs.state; 745 S3I(s)->hs.state = state; 746 cb(s, SSL_CB_ACCEPT_LOOP, 1); 747 S3I(s)->hs.state = new_state; 748 } 749 } 750 skip = 0; 751 } 752 end: 753 /* BIO_flush(s->wbio); */ 754 s->internal->in_handshake--; 755 if (cb != NULL) 756 cb(s, SSL_CB_ACCEPT_EXIT, ret); 757 758 return (ret); 759 } 760 761 int 762 ssl3_send_hello_request(SSL *s) 763 { 764 CBB cbb, hello; 765 766 memset(&cbb, 0, sizeof(cbb)); 767 768 if (S3I(s)->hs.state == SSL3_ST_SW_HELLO_REQ_A) { 769 if (!ssl3_handshake_msg_start(s, &cbb, &hello, 770 SSL3_MT_HELLO_REQUEST)) 771 goto err; 772 if (!ssl3_handshake_msg_finish(s, &cbb)) 773 goto err; 774 775 S3I(s)->hs.state = SSL3_ST_SW_HELLO_REQ_B; 776 } 777 778 /* SSL3_ST_SW_HELLO_REQ_B */ 779 return (ssl3_handshake_write(s)); 780 781 err: 782 CBB_cleanup(&cbb); 783 784 return (-1); 785 } 786 787 int 788 ssl3_get_client_hello(SSL *s) 789 { 790 CBS cbs, client_random, session_id, cookie, cipher_suites; 791 CBS compression_methods; 792 uint16_t client_version; 793 uint8_t comp_method; 794 int comp_null; 795 int i, j, ok, al, ret = -1, cookie_valid = 0; 796 long n; 797 unsigned long id; 798 SSL_CIPHER *c; 799 STACK_OF(SSL_CIPHER) *ciphers = NULL; 800 unsigned long alg_k; 801 const SSL_METHOD *method; 802 uint16_t max_version, shared_version; 803 804 /* 805 * We do this so that we will respond with our native type. 806 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1, 807 * This down switching should be handled by a different method. 808 * If we are SSLv3, we will respond with SSLv3, even if prompted with 809 * TLSv1. 810 */ 811 if (S3I(s)->hs.state == SSL3_ST_SR_CLNT_HELLO_A) { 812 S3I(s)->hs.state = SSL3_ST_SR_CLNT_HELLO_B; 813 } 814 815 s->internal->first_packet = 1; 816 n = ssl3_get_message(s, SSL3_ST_SR_CLNT_HELLO_B, 817 SSL3_ST_SR_CLNT_HELLO_C, SSL3_MT_CLIENT_HELLO, 818 SSL3_RT_MAX_PLAIN_LENGTH, &ok); 819 if (!ok) 820 return ((int)n); 821 s->internal->first_packet = 0; 822 823 if (n < 0) 824 goto err; 825 826 CBS_init(&cbs, s->internal->init_msg, n); 827 828 /* Parse client hello up until the extensions (if any). */ 829 if (!CBS_get_u16(&cbs, &client_version)) 830 goto truncated; 831 if (!CBS_get_bytes(&cbs, &client_random, SSL3_RANDOM_SIZE)) 832 goto truncated; 833 if (!CBS_get_u8_length_prefixed(&cbs, &session_id)) 834 goto truncated; 835 if (CBS_len(&session_id) > SSL3_SESSION_ID_SIZE) { 836 al = SSL_AD_ILLEGAL_PARAMETER; 837 SSLerror(s, SSL_R_SSL3_SESSION_ID_TOO_LONG); 838 goto f_err; 839 } 840 if (SSL_IS_DTLS(s)) { 841 if (!CBS_get_u8_length_prefixed(&cbs, &cookie)) 842 goto truncated; 843 } 844 if (!CBS_get_u16_length_prefixed(&cbs, &cipher_suites)) 845 goto truncated; 846 if (!CBS_get_u8_length_prefixed(&cbs, &compression_methods)) 847 goto truncated; 848 849 /* 850 * Use version from inside client hello, not from record header. 851 * (may differ: see RFC 2246, Appendix E, second paragraph) 852 */ 853 if (!ssl_downgrade_max_version(s, &max_version)) 854 goto err; 855 if (ssl_max_shared_version(s, client_version, &shared_version) != 1) { 856 SSLerror(s, SSL_R_WRONG_VERSION_NUMBER); 857 if ((s->client_version >> 8) == SSL3_VERSION_MAJOR && 858 !s->internal->enc_write_ctx && !s->internal->write_hash) { 859 /* 860 * Similar to ssl3_get_record, send alert using remote 861 * version number. 862 */ 863 s->version = s->client_version; 864 } 865 al = SSL_AD_PROTOCOL_VERSION; 866 goto f_err; 867 } 868 s->client_version = client_version; 869 s->version = shared_version; 870 871 if ((method = ssl_get_server_method(shared_version)) == NULL) { 872 SSLerror(s, ERR_R_INTERNAL_ERROR); 873 goto err; 874 } 875 s->method = method; 876 877 /* 878 * If we require cookies (DTLS) and this ClientHello does not contain 879 * one, just return since we do not want to allocate any memory yet. 880 * So check cookie length... 881 */ 882 if (SSL_IS_DTLS(s)) { 883 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) { 884 if (CBS_len(&cookie) == 0) 885 return (1); 886 } 887 } 888 889 if (!CBS_write_bytes(&client_random, s->s3->client_random, 890 sizeof(s->s3->client_random), NULL)) 891 goto err; 892 893 s->internal->hit = 0; 894 895 /* 896 * Versions before 0.9.7 always allow clients to resume sessions in 897 * renegotiation. 0.9.7 and later allow this by default, but optionally 898 * ignore resumption requests with flag 899 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag 900 * rather than a change to default behavior so that applications 901 * relying on this for security won't even compile against older 902 * library versions). 903 * 904 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() 905 * to request renegotiation but not a new session (s->internal->new_session 906 * remains unset): for servers, this essentially just means that the 907 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be 908 * ignored. 909 */ 910 if ((s->internal->new_session && (s->internal->options & 911 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) { 912 if (!ssl_get_new_session(s, 1)) 913 goto err; 914 } else { 915 CBS ext_block; 916 917 CBS_dup(&cbs, &ext_block); 918 919 i = ssl_get_prev_session(s, &session_id, &ext_block, &al); 920 if (i == 1) { /* previous session */ 921 s->internal->hit = 1; 922 } else if (i == -1) 923 goto f_err; 924 else { 925 /* i == 0 */ 926 if (!ssl_get_new_session(s, 1)) 927 goto err; 928 } 929 } 930 931 if (SSL_IS_DTLS(s)) { 932 /* 933 * The ClientHello may contain a cookie even if the HelloVerify 934 * message has not been sent - make sure that it does not cause 935 * an overflow. 936 */ 937 if (CBS_len(&cookie) > sizeof(D1I(s)->rcvd_cookie)) { 938 al = SSL_AD_DECODE_ERROR; 939 SSLerror(s, SSL_R_COOKIE_MISMATCH); 940 goto f_err; 941 } 942 943 /* Verify the cookie if appropriate option is set. */ 944 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) && 945 CBS_len(&cookie) > 0) { 946 size_t cookie_len; 947 948 /* XXX - rcvd_cookie seems to only be used here... */ 949 if (!CBS_write_bytes(&cookie, D1I(s)->rcvd_cookie, 950 sizeof(D1I(s)->rcvd_cookie), &cookie_len)) 951 goto err; 952 953 if (s->ctx->internal->app_verify_cookie_cb != NULL) { 954 if (s->ctx->internal->app_verify_cookie_cb(s, 955 D1I(s)->rcvd_cookie, cookie_len) == 0) { 956 al = SSL_AD_HANDSHAKE_FAILURE; 957 SSLerror(s, SSL_R_COOKIE_MISMATCH); 958 goto f_err; 959 } 960 /* else cookie verification succeeded */ 961 /* XXX - can d1->cookie_len > sizeof(rcvd_cookie) ? */ 962 } else if (timingsafe_memcmp(D1I(s)->rcvd_cookie, 963 D1I(s)->cookie, D1I(s)->cookie_len) != 0) { 964 /* default verification */ 965 al = SSL_AD_HANDSHAKE_FAILURE; 966 SSLerror(s, SSL_R_COOKIE_MISMATCH); 967 goto f_err; 968 } 969 cookie_valid = 1; 970 } 971 } 972 973 /* XXX - This logic seems wrong... */ 974 if (CBS_len(&cipher_suites) == 0 && CBS_len(&session_id) != 0) { 975 /* we need a cipher if we are not resuming a session */ 976 al = SSL_AD_ILLEGAL_PARAMETER; 977 SSLerror(s, SSL_R_NO_CIPHERS_SPECIFIED); 978 goto f_err; 979 } 980 981 if (CBS_len(&cipher_suites) > 0) { 982 if ((ciphers = ssl_bytes_to_cipher_list(s, 983 &cipher_suites)) == NULL) 984 goto err; 985 } 986 987 /* If it is a hit, check that the cipher is in the list */ 988 /* XXX - CBS_len(&cipher_suites) will always be zero here... */ 989 if (s->internal->hit && CBS_len(&cipher_suites) > 0) { 990 j = 0; 991 id = s->session->cipher->id; 992 993 for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { 994 c = sk_SSL_CIPHER_value(ciphers, i); 995 if (c->id == id) { 996 j = 1; 997 break; 998 } 999 } 1000 if (j == 0) { 1001 /* 1002 * We need to have the cipher in the cipher 1003 * list if we are asked to reuse it 1004 */ 1005 al = SSL_AD_ILLEGAL_PARAMETER; 1006 SSLerror(s, SSL_R_REQUIRED_CIPHER_MISSING); 1007 goto f_err; 1008 } 1009 } 1010 1011 comp_null = 0; 1012 while (CBS_len(&compression_methods) > 0) { 1013 if (!CBS_get_u8(&compression_methods, &comp_method)) 1014 goto truncated; 1015 if (comp_method == 0) 1016 comp_null = 1; 1017 } 1018 if (comp_null == 0) { 1019 al = SSL_AD_DECODE_ERROR; 1020 SSLerror(s, SSL_R_NO_COMPRESSION_SPECIFIED); 1021 goto f_err; 1022 } 1023 1024 if (!tlsext_server_parse(s, SSL_TLSEXT_MSG_CH, &cbs, &al)) { 1025 SSLerror(s, SSL_R_PARSE_TLSEXT); 1026 goto f_err; 1027 } 1028 1029 if (!S3I(s)->renegotiate_seen && s->internal->renegotiate) { 1030 al = SSL_AD_HANDSHAKE_FAILURE; 1031 SSLerror(s, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 1032 goto f_err; 1033 } 1034 1035 if (ssl_check_clienthello_tlsext_early(s) <= 0) { 1036 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1037 goto err; 1038 } 1039 1040 /* 1041 * Check if we want to use external pre-shared secret for this 1042 * handshake for not reused session only. We need to generate 1043 * server_random before calling tls_session_secret_cb in order to allow 1044 * SessionTicket processing to use it in key derivation. 1045 */ 1046 arc4random_buf(s->s3->server_random, SSL3_RANDOM_SIZE); 1047 1048 if (!SSL_IS_DTLS(s) && max_version >= TLS1_2_VERSION && 1049 s->version < max_version) { 1050 /* 1051 * RFC 8446 section 4.1.3. If we are downgrading from TLS 1.3 1052 * we must set the last 8 bytes of the server random to magical 1053 * values to indicate we meant to downgrade. For TLS 1.2 it is 1054 * recommended that we do the same. 1055 */ 1056 size_t index = SSL3_RANDOM_SIZE - sizeof(tls13_downgrade_12); 1057 uint8_t *magic = &s->s3->server_random[index]; 1058 if (s->version == TLS1_2_VERSION) { 1059 /* Indicate we chose to downgrade to 1.2. */ 1060 memcpy(magic, tls13_downgrade_12, 1061 sizeof(tls13_downgrade_12)); 1062 } else { 1063 /* Indicate we chose to downgrade to 1.1 or lower */ 1064 memcpy(magic, tls13_downgrade_11, 1065 sizeof(tls13_downgrade_11)); 1066 } 1067 } 1068 1069 if (!s->internal->hit && s->internal->tls_session_secret_cb) { 1070 SSL_CIPHER *pref_cipher = NULL; 1071 1072 s->session->master_key_length = sizeof(s->session->master_key); 1073 if (s->internal->tls_session_secret_cb(s, s->session->master_key, 1074 &s->session->master_key_length, ciphers, &pref_cipher, 1075 s->internal->tls_session_secret_cb_arg)) { 1076 s->internal->hit = 1; 1077 s->session->ciphers = ciphers; 1078 s->session->verify_result = X509_V_OK; 1079 1080 ciphers = NULL; 1081 1082 /* check if some cipher was preferred by call back */ 1083 pref_cipher = pref_cipher ? pref_cipher : 1084 ssl3_choose_cipher(s, s->session->ciphers, 1085 SSL_get_ciphers(s)); 1086 if (pref_cipher == NULL) { 1087 al = SSL_AD_HANDSHAKE_FAILURE; 1088 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1089 goto f_err; 1090 } 1091 1092 s->session->cipher = pref_cipher; 1093 1094 sk_SSL_CIPHER_free(s->cipher_list); 1095 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers); 1096 } 1097 } 1098 1099 /* 1100 * Given s->session->ciphers and SSL_get_ciphers, we must 1101 * pick a cipher 1102 */ 1103 1104 if (!s->internal->hit) { 1105 sk_SSL_CIPHER_free(s->session->ciphers); 1106 s->session->ciphers = ciphers; 1107 if (ciphers == NULL) { 1108 al = SSL_AD_ILLEGAL_PARAMETER; 1109 SSLerror(s, SSL_R_NO_CIPHERS_PASSED); 1110 goto f_err; 1111 } 1112 ciphers = NULL; 1113 c = ssl3_choose_cipher(s, s->session->ciphers, 1114 SSL_get_ciphers(s)); 1115 1116 if (c == NULL) { 1117 al = SSL_AD_HANDSHAKE_FAILURE; 1118 SSLerror(s, SSL_R_NO_SHARED_CIPHER); 1119 goto f_err; 1120 } 1121 S3I(s)->hs.new_cipher = c; 1122 } else { 1123 S3I(s)->hs.new_cipher = s->session->cipher; 1124 } 1125 1126 if (!tls1_transcript_hash_init(s)) 1127 goto err; 1128 1129 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 1130 if (!(SSL_USE_SIGALGS(s) || (alg_k & SSL_kGOST)) || 1131 !(s->verify_mode & SSL_VERIFY_PEER)) 1132 tls1_transcript_free(s); 1133 1134 /* 1135 * We now have the following setup. 1136 * client_random 1137 * cipher_list - our prefered list of ciphers 1138 * ciphers - the clients prefered list of ciphers 1139 * compression - basically ignored right now 1140 * ssl version is set - sslv3 1141 * s->session - The ssl session has been setup. 1142 * s->internal->hit - session reuse flag 1143 * s->hs.new_cipher - the new cipher to use. 1144 */ 1145 1146 /* Handles TLS extensions that we couldn't check earlier */ 1147 if (ssl_check_clienthello_tlsext_late(s) <= 0) { 1148 SSLerror(s, SSL_R_CLIENTHELLO_TLSEXT); 1149 goto err; 1150 } 1151 1152 ret = cookie_valid ? 2 : 1; 1153 1154 if (0) { 1155 truncated: 1156 al = SSL_AD_DECODE_ERROR; 1157 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1158 f_err: 1159 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1160 } 1161 err: 1162 sk_SSL_CIPHER_free(ciphers); 1163 1164 return (ret); 1165 } 1166 1167 int 1168 ssl3_send_server_hello(SSL *s) 1169 { 1170 CBB cbb, server_hello, session_id; 1171 size_t sl; 1172 1173 memset(&cbb, 0, sizeof(cbb)); 1174 1175 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 1176 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello, 1177 SSL3_MT_SERVER_HELLO)) 1178 goto err; 1179 1180 if (!CBB_add_u16(&server_hello, s->version)) 1181 goto err; 1182 if (!CBB_add_bytes(&server_hello, s->s3->server_random, 1183 sizeof(s->s3->server_random))) 1184 goto err; 1185 1186 /* 1187 * There are several cases for the session ID to send 1188 * back in the server hello: 1189 * 1190 * - For session reuse from the session cache, 1191 * we send back the old session ID. 1192 * - If stateless session reuse (using a session ticket) 1193 * is successful, we send back the client's "session ID" 1194 * (which doesn't actually identify the session). 1195 * - If it is a new session, we send back the new 1196 * session ID. 1197 * - However, if we want the new session to be single-use, 1198 * we send back a 0-length session ID. 1199 * 1200 * s->internal->hit is non-zero in either case of session reuse, 1201 * so the following won't overwrite an ID that we're supposed 1202 * to send back. 1203 */ 1204 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER) 1205 && !s->internal->hit) 1206 s->session->session_id_length = 0; 1207 1208 sl = s->session->session_id_length; 1209 if (sl > sizeof(s->session->session_id)) { 1210 SSLerror(s, ERR_R_INTERNAL_ERROR); 1211 goto err; 1212 } 1213 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) 1214 goto err; 1215 if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) 1216 goto err; 1217 1218 /* Cipher suite. */ 1219 if (!CBB_add_u16(&server_hello, 1220 ssl3_cipher_get_value(S3I(s)->hs.new_cipher))) 1221 goto err; 1222 1223 /* Compression method (null). */ 1224 if (!CBB_add_u8(&server_hello, 0)) 1225 goto err; 1226 1227 /* TLS extensions */ 1228 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) { 1229 SSLerror(s, ERR_R_INTERNAL_ERROR); 1230 goto err; 1231 } 1232 1233 if (!ssl3_handshake_msg_finish(s, &cbb)) 1234 goto err; 1235 } 1236 1237 /* SSL3_ST_SW_SRVR_HELLO_B */ 1238 return (ssl3_handshake_write(s)); 1239 1240 err: 1241 CBB_cleanup(&cbb); 1242 1243 return (-1); 1244 } 1245 1246 int 1247 ssl3_send_server_done(SSL *s) 1248 { 1249 CBB cbb, done; 1250 1251 memset(&cbb, 0, sizeof(cbb)); 1252 1253 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) { 1254 if (!ssl3_handshake_msg_start(s, &cbb, &done, 1255 SSL3_MT_SERVER_DONE)) 1256 goto err; 1257 if (!ssl3_handshake_msg_finish(s, &cbb)) 1258 goto err; 1259 1260 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B; 1261 } 1262 1263 /* SSL3_ST_SW_SRVR_DONE_B */ 1264 return (ssl3_handshake_write(s)); 1265 1266 err: 1267 CBB_cleanup(&cbb); 1268 1269 return (-1); 1270 } 1271 1272 static int 1273 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) 1274 { 1275 CBB dh_p, dh_g, dh_Ys; 1276 DH *dh = NULL, *dhp; 1277 unsigned char *data; 1278 int al; 1279 1280 if (s->cert->dh_tmp_auto != 0) { 1281 if ((dhp = ssl_get_auto_dh(s)) == NULL) { 1282 al = SSL_AD_INTERNAL_ERROR; 1283 SSLerror(s, ERR_R_INTERNAL_ERROR); 1284 goto f_err; 1285 } 1286 } else 1287 dhp = s->cert->dh_tmp; 1288 1289 if (dhp == NULL && s->cert->dh_tmp_cb != NULL) 1290 dhp = s->cert->dh_tmp_cb(s, 0, 1291 SSL_C_PKEYLENGTH(S3I(s)->hs.new_cipher)); 1292 1293 if (dhp == NULL) { 1294 al = SSL_AD_HANDSHAKE_FAILURE; 1295 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1296 goto f_err; 1297 } 1298 1299 if (S3I(s)->tmp.dh != NULL) { 1300 SSLerror(s, ERR_R_INTERNAL_ERROR); 1301 goto err; 1302 } 1303 1304 if (s->cert->dh_tmp_auto != 0) { 1305 dh = dhp; 1306 } else if ((dh = DHparams_dup(dhp)) == NULL) { 1307 SSLerror(s, ERR_R_DH_LIB); 1308 goto err; 1309 } 1310 S3I(s)->tmp.dh = dh; 1311 if (!DH_generate_key(dh)) { 1312 SSLerror(s, ERR_R_DH_LIB); 1313 goto err; 1314 } 1315 1316 /* 1317 * Serialize the DH parameters and public key. 1318 */ 1319 if (!CBB_add_u16_length_prefixed(cbb, &dh_p)) 1320 goto err; 1321 if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p))) 1322 goto err; 1323 BN_bn2bin(dh->p, data); 1324 1325 if (!CBB_add_u16_length_prefixed(cbb, &dh_g)) 1326 goto err; 1327 if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g))) 1328 goto err; 1329 BN_bn2bin(dh->g, data); 1330 1331 if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys)) 1332 goto err; 1333 if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key))) 1334 goto err; 1335 BN_bn2bin(dh->pub_key, data); 1336 1337 if (!CBB_flush(cbb)) 1338 goto err; 1339 1340 return (1); 1341 1342 f_err: 1343 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1344 err: 1345 return (-1); 1346 } 1347 1348 static int 1349 ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb) 1350 { 1351 uint16_t curve_id; 1352 EC_KEY *ecdh; 1353 CBB ecpoint; 1354 int al; 1355 1356 /* 1357 * Only named curves are supported in ECDH ephemeral key exchanges. 1358 * For supported named curves, curve_id is non-zero. 1359 */ 1360 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1361 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1362 goto err; 1363 } 1364 1365 if (S3I(s)->tmp.ecdh != NULL) { 1366 SSLerror(s, ERR_R_INTERNAL_ERROR); 1367 goto err; 1368 } 1369 1370 if ((S3I(s)->tmp.ecdh = EC_KEY_new()) == NULL) { 1371 al = SSL_AD_HANDSHAKE_FAILURE; 1372 SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY); 1373 goto f_err; 1374 } 1375 S3I(s)->tmp.ecdh_nid = nid; 1376 ecdh = S3I(s)->tmp.ecdh; 1377 1378 if (!ssl_kex_generate_ecdhe_ecp(ecdh, nid)) 1379 goto err; 1380 1381 /* 1382 * Encode the public key. 1383 * 1384 * Only named curves are supported in ECDH ephemeral key exchanges. 1385 * In this case the ServerKeyExchange message has: 1386 * [1 byte CurveType], [2 byte CurveName] 1387 * [1 byte length of encoded point], followed by 1388 * the actual encoded point itself. 1389 */ 1390 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1391 goto err; 1392 if (!CBB_add_u16(cbb, curve_id)) 1393 goto err; 1394 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1395 goto err; 1396 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 1397 goto err; 1398 if (!CBB_flush(cbb)) 1399 goto err; 1400 1401 return (1); 1402 1403 f_err: 1404 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1405 err: 1406 return (-1); 1407 } 1408 1409 static int 1410 ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb) 1411 { 1412 uint8_t *public_key = NULL, *private_key = NULL; 1413 uint16_t curve_id; 1414 CBB ecpoint; 1415 int ret = -1; 1416 1417 /* Generate an X25519 key pair. */ 1418 if (S3I(s)->tmp.x25519 != NULL) { 1419 SSLerror(s, ERR_R_INTERNAL_ERROR); 1420 goto err; 1421 } 1422 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 1423 goto err; 1424 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 1425 goto err; 1426 X25519_keypair(public_key, private_key); 1427 1428 /* Serialize public key. */ 1429 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1430 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1431 goto err; 1432 } 1433 1434 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1435 goto err; 1436 if (!CBB_add_u16(cbb, curve_id)) 1437 goto err; 1438 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1439 goto err; 1440 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 1441 goto err; 1442 if (!CBB_flush(cbb)) 1443 goto err; 1444 1445 S3I(s)->tmp.x25519 = private_key; 1446 private_key = NULL; 1447 ret = 1; 1448 1449 err: 1450 free(public_key); 1451 freezero(private_key, X25519_KEY_LENGTH); 1452 1453 return (ret); 1454 } 1455 1456 static int 1457 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) 1458 { 1459 int nid; 1460 1461 nid = tls1_get_shared_curve(s); 1462 1463 if (nid == NID_X25519) 1464 return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb); 1465 1466 return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb); 1467 } 1468 1469 int 1470 ssl3_send_server_key_exchange(SSL *s) 1471 { 1472 CBB cbb, cbb_params, cbb_signature, server_kex; 1473 const struct ssl_sigalg *sigalg = NULL; 1474 unsigned char *signature = NULL; 1475 size_t signature_len = 0; 1476 unsigned char *params = NULL; 1477 size_t params_len; 1478 const EVP_MD *md = NULL; 1479 unsigned long type; 1480 EVP_MD_CTX md_ctx; 1481 EVP_PKEY_CTX *pctx; 1482 EVP_PKEY *pkey; 1483 int al; 1484 1485 memset(&cbb, 0, sizeof(cbb)); 1486 memset(&cbb_params, 0, sizeof(cbb_params)); 1487 1488 EVP_MD_CTX_init(&md_ctx); 1489 1490 if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) { 1491 1492 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex, 1493 SSL3_MT_SERVER_KEY_EXCHANGE)) 1494 goto err; 1495 1496 if (!CBB_init(&cbb_params, 0)) 1497 goto err; 1498 1499 type = S3I(s)->hs.new_cipher->algorithm_mkey; 1500 if (type & SSL_kDHE) { 1501 if (ssl3_send_server_kex_dhe(s, &cbb_params) != 1) 1502 goto err; 1503 } else if (type & SSL_kECDHE) { 1504 if (ssl3_send_server_kex_ecdhe(s, &cbb_params) != 1) 1505 goto err; 1506 } else { 1507 al = SSL_AD_HANDSHAKE_FAILURE; 1508 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1509 goto f_err; 1510 } 1511 1512 if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len)) 1513 goto err; 1514 1515 if (!CBB_add_bytes(&server_kex, params, params_len)) 1516 goto err; 1517 1518 /* Add signature unless anonymous. */ 1519 if (!(S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL)) { 1520 if ((pkey = ssl_get_sign_pkey(s, S3I(s)->hs.new_cipher, 1521 &md, &sigalg)) == NULL) { 1522 al = SSL_AD_DECODE_ERROR; 1523 goto f_err; 1524 } 1525 1526 /* Send signature algorithm. */ 1527 if (SSL_USE_SIGALGS(s)) { 1528 if (!CBB_add_u16(&server_kex, sigalg->value)) { 1529 al = SSL_AD_INTERNAL_ERROR; 1530 SSLerror(s, ERR_R_INTERNAL_ERROR); 1531 goto f_err; 1532 } 1533 } 1534 1535 if (!EVP_DigestSignInit(&md_ctx, &pctx, md, NULL, pkey)) { 1536 SSLerror(s, ERR_R_EVP_LIB); 1537 goto err; 1538 } 1539 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1540 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1541 RSA_PKCS1_PSS_PADDING) || 1542 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1543 SSLerror(s, ERR_R_EVP_LIB); 1544 goto err; 1545 } 1546 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->client_random, 1547 SSL3_RANDOM_SIZE)) { 1548 SSLerror(s, ERR_R_EVP_LIB); 1549 goto err; 1550 } 1551 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->server_random, 1552 SSL3_RANDOM_SIZE)) { 1553 SSLerror(s, ERR_R_EVP_LIB); 1554 goto err; 1555 } 1556 if (!EVP_DigestSignUpdate(&md_ctx, params, params_len)) { 1557 SSLerror(s, ERR_R_EVP_LIB); 1558 goto err; 1559 } 1560 if (!EVP_DigestSignFinal(&md_ctx, NULL, &signature_len) || 1561 !signature_len) { 1562 SSLerror(s, ERR_R_EVP_LIB); 1563 goto err; 1564 } 1565 if ((signature = calloc(1, signature_len)) == NULL) { 1566 SSLerror(s, ERR_R_MALLOC_FAILURE); 1567 goto err; 1568 } 1569 if (!EVP_DigestSignFinal(&md_ctx, signature, &signature_len)) { 1570 SSLerror(s, ERR_R_EVP_LIB); 1571 goto err; 1572 } 1573 1574 if (!CBB_add_u16_length_prefixed(&server_kex, 1575 &cbb_signature)) 1576 goto err; 1577 if (!CBB_add_bytes(&cbb_signature, signature, 1578 signature_len)) 1579 goto err; 1580 } 1581 1582 if (!ssl3_handshake_msg_finish(s, &cbb)) 1583 goto err; 1584 1585 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1586 } 1587 1588 EVP_MD_CTX_cleanup(&md_ctx); 1589 free(params); 1590 free(signature); 1591 1592 return (ssl3_handshake_write(s)); 1593 1594 f_err: 1595 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1596 err: 1597 CBB_cleanup(&cbb_params); 1598 CBB_cleanup(&cbb); 1599 EVP_MD_CTX_cleanup(&md_ctx); 1600 free(params); 1601 free(signature); 1602 1603 return (-1); 1604 } 1605 1606 int 1607 ssl3_send_certificate_request(SSL *s) 1608 { 1609 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1610 STACK_OF(X509_NAME) *sk = NULL; 1611 X509_NAME *name; 1612 int i; 1613 1614 /* 1615 * Certificate Request - RFC 5246 section 7.4.4. 1616 */ 1617 1618 memset(&cbb, 0, sizeof(cbb)); 1619 1620 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1621 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, 1622 SSL3_MT_CERTIFICATE_REQUEST)) 1623 goto err; 1624 1625 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1626 goto err; 1627 if (!ssl3_get_req_cert_types(s, &cert_types)) 1628 goto err; 1629 1630 if (SSL_USE_SIGALGS(s)) { 1631 if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs)) 1632 goto err; 1633 if (!ssl_sigalgs_build(&sigalgs, tls12_sigalgs, tls12_sigalgs_len)) 1634 goto err; 1635 } 1636 1637 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) 1638 goto err; 1639 1640 sk = SSL_get_client_CA_list(s); 1641 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1642 unsigned char *name_data; 1643 size_t name_len; 1644 1645 name = sk_X509_NAME_value(sk, i); 1646 name_len = i2d_X509_NAME(name, NULL); 1647 1648 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) 1649 goto err; 1650 if (!CBB_add_space(&dn, &name_data, name_len)) 1651 goto err; 1652 if (i2d_X509_NAME(name, &name_data) != name_len) 1653 goto err; 1654 } 1655 1656 if (!ssl3_handshake_msg_finish(s, &cbb)) 1657 goto err; 1658 1659 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B; 1660 } 1661 1662 /* SSL3_ST_SW_CERT_REQ_B */ 1663 return (ssl3_handshake_write(s)); 1664 1665 err: 1666 CBB_cleanup(&cbb); 1667 1668 return (-1); 1669 } 1670 1671 static int 1672 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs) 1673 { 1674 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; 1675 unsigned char *pms = NULL; 1676 unsigned char *p; 1677 size_t pms_len = 0; 1678 EVP_PKEY *pkey = NULL; 1679 RSA *rsa = NULL; 1680 CBS enc_pms; 1681 int decrypt_len; 1682 int al = -1; 1683 1684 arc4random_buf(fakekey, sizeof(fakekey)); 1685 fakekey[0] = s->client_version >> 8; 1686 fakekey[1] = s->client_version & 0xff; 1687 1688 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey; 1689 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || 1690 (pkey->pkey.rsa == NULL)) { 1691 al = SSL_AD_HANDSHAKE_FAILURE; 1692 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); 1693 goto f_err; 1694 } 1695 rsa = pkey->pkey.rsa; 1696 1697 pms_len = RSA_size(rsa); 1698 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH) 1699 goto err; 1700 if ((pms = malloc(pms_len)) == NULL) 1701 goto err; 1702 p = pms; 1703 1704 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms)) 1705 goto truncated; 1706 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) { 1707 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1708 goto err; 1709 } 1710 1711 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms), 1712 pms, rsa, RSA_PKCS1_PADDING); 1713 1714 ERR_clear_error(); 1715 1716 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) { 1717 al = SSL_AD_DECODE_ERROR; 1718 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ 1719 } 1720 1721 if ((al == -1) && !((pms[0] == (s->client_version >> 8)) && 1722 (pms[1] == (s->client_version & 0xff)))) { 1723 /* 1724 * The premaster secret must contain the same version number 1725 * as the ClientHello to detect version rollback attacks 1726 * (strangely, the protocol does not offer such protection for 1727 * DH ciphersuites). 1728 * 1729 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack 1730 * (http://eprint.iacr.org/2003/052/) exploits the version 1731 * number check as a "bad version oracle" -- an alert would 1732 * reveal that the plaintext corresponding to some ciphertext 1733 * made up by the adversary is properly formatted except that 1734 * the version number is wrong. To avoid such attacks, we should 1735 * treat this just like any other decryption error. 1736 */ 1737 al = SSL_AD_DECODE_ERROR; 1738 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ 1739 } 1740 1741 if (al != -1) { 1742 /* 1743 * Some decryption failure -- use random value instead 1744 * as countermeasure against Bleichenbacher's attack 1745 * on PKCS #1 v1.5 RSA padding (see RFC 2246, 1746 * section 7.4.7.1). 1747 */ 1748 p = fakekey; 1749 } 1750 1751 s->session->master_key_length = 1752 tls1_generate_master_secret(s, 1753 s->session->master_key, p, SSL_MAX_MASTER_KEY_LENGTH); 1754 1755 freezero(pms, pms_len); 1756 1757 return (1); 1758 1759 truncated: 1760 al = SSL_AD_DECODE_ERROR; 1761 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1762 f_err: 1763 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1764 err: 1765 freezero(pms, pms_len); 1766 1767 return (-1); 1768 } 1769 1770 static int 1771 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) 1772 { 1773 int key_size = 0; 1774 int key_is_invalid, key_len, al; 1775 unsigned char *key = NULL; 1776 BIGNUM *bn = NULL; 1777 CBS dh_Yc; 1778 DH *dh; 1779 1780 if (!CBS_get_u16_length_prefixed(cbs, &dh_Yc)) 1781 goto truncated; 1782 if (CBS_len(cbs) != 0) 1783 goto truncated; 1784 1785 if (S3I(s)->tmp.dh == NULL) { 1786 al = SSL_AD_HANDSHAKE_FAILURE; 1787 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1788 goto f_err; 1789 } 1790 dh = S3I(s)->tmp.dh; 1791 1792 if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) { 1793 SSLerror(s, SSL_R_BN_LIB); 1794 goto err; 1795 } 1796 1797 if ((key_size = DH_size(dh)) <= 0) { 1798 SSLerror(s, ERR_R_DH_LIB); 1799 goto err; 1800 } 1801 if ((key = malloc(key_size)) == NULL) { 1802 SSLerror(s, ERR_R_MALLOC_FAILURE); 1803 goto err; 1804 } 1805 if (!DH_check_pub_key(dh, bn, &key_is_invalid)) { 1806 al = SSL_AD_INTERNAL_ERROR; 1807 SSLerror(s, ERR_R_DH_LIB); 1808 goto f_err; 1809 } 1810 if (key_is_invalid) { 1811 al = SSL_AD_ILLEGAL_PARAMETER; 1812 SSLerror(s, ERR_R_DH_LIB); 1813 goto f_err; 1814 } 1815 if ((key_len = DH_compute_key(key, bn, dh)) <= 0) { 1816 al = SSL_AD_INTERNAL_ERROR; 1817 SSLerror(s, ERR_R_DH_LIB); 1818 goto f_err; 1819 } 1820 1821 s->session->master_key_length = tls1_generate_master_secret(s, 1822 s->session->master_key, key, key_len); 1823 1824 DH_free(S3I(s)->tmp.dh); 1825 S3I(s)->tmp.dh = NULL; 1826 1827 freezero(key, key_size); 1828 BN_clear_free(bn); 1829 1830 return (1); 1831 1832 truncated: 1833 al = SSL_AD_DECODE_ERROR; 1834 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1835 f_err: 1836 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1837 err: 1838 freezero(key, key_size); 1839 BN_clear_free(bn); 1840 1841 return (-1); 1842 } 1843 1844 static int 1845 ssl3_get_client_kex_ecdhe_ecp(SSL *s, CBS *cbs) 1846 { 1847 uint8_t *key = NULL; 1848 size_t key_len = 0; 1849 EC_KEY *ecdh_peer = NULL; 1850 EC_KEY *ecdh; 1851 CBS public; 1852 int ret = -1; 1853 1854 /* 1855 * Use the ephemeral values we saved when generating the 1856 * ServerKeyExchange message. 1857 */ 1858 if ((ecdh = S3I(s)->tmp.ecdh) == NULL) { 1859 SSLerror(s, ERR_R_INTERNAL_ERROR); 1860 goto err; 1861 } 1862 1863 /* 1864 * Get client's public key from encoded point in the ClientKeyExchange 1865 * message. 1866 */ 1867 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1868 goto err; 1869 if (CBS_len(cbs) != 0) 1870 goto err; 1871 1872 if ((ecdh_peer = EC_KEY_new()) == NULL) 1873 goto err; 1874 1875 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh_peer, S3I(s)->tmp.ecdh_nid, 1876 &public)) 1877 goto err; 1878 1879 /* Derive the shared secret and compute master secret. */ 1880 if (!ssl_kex_derive_ecdhe_ecp(ecdh, ecdh_peer, &key, &key_len)) 1881 goto err; 1882 s->session->master_key_length = tls1_generate_master_secret(s, 1883 s->session->master_key, key, key_len); 1884 1885 EC_KEY_free(S3I(s)->tmp.ecdh); 1886 S3I(s)->tmp.ecdh = NULL; 1887 S3I(s)->tmp.ecdh_nid = NID_undef; 1888 1889 ret = 1; 1890 1891 err: 1892 freezero(key, key_len); 1893 EC_KEY_free(ecdh_peer); 1894 1895 return (ret); 1896 } 1897 1898 static int 1899 ssl3_get_client_kex_ecdhe_ecx(SSL *s, CBS *cbs) 1900 { 1901 uint8_t *shared_key = NULL; 1902 CBS ecpoint; 1903 int ret = -1; 1904 1905 if (!CBS_get_u8_length_prefixed(cbs, &ecpoint)) 1906 goto err; 1907 if (CBS_len(cbs) != 0) 1908 goto err; 1909 if (CBS_len(&ecpoint) != X25519_KEY_LENGTH) 1910 goto err; 1911 1912 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 1913 goto err; 1914 if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint))) 1915 goto err; 1916 1917 freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH); 1918 S3I(s)->tmp.x25519 = NULL; 1919 1920 s->session->master_key_length = 1921 tls1_generate_master_secret( 1922 s, s->session->master_key, shared_key, X25519_KEY_LENGTH); 1923 1924 ret = 1; 1925 1926 err: 1927 freezero(shared_key, X25519_KEY_LENGTH); 1928 1929 return (ret); 1930 } 1931 1932 static int 1933 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) 1934 { 1935 if (S3I(s)->tmp.x25519 != NULL) 1936 return ssl3_get_client_kex_ecdhe_ecx(s, cbs); 1937 1938 return ssl3_get_client_kex_ecdhe_ecp(s, cbs); 1939 } 1940 1941 static int 1942 ssl3_get_client_kex_gost(SSL *s, CBS *cbs) 1943 { 1944 EVP_PKEY_CTX *pkey_ctx; 1945 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; 1946 unsigned char premaster_secret[32]; 1947 unsigned long alg_a; 1948 size_t outlen = 32; 1949 CBS gostblob; 1950 int al; 1951 int ret = 0; 1952 1953 /* Get our certificate private key*/ 1954 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1955 if (alg_a & SSL_aGOST01) 1956 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 1957 1958 if ((pkey_ctx = EVP_PKEY_CTX_new(pk, NULL)) == NULL) 1959 goto err; 1960 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) 1961 goto gerr; 1962 1963 /* 1964 * If client certificate is present and is of the same type, 1965 * maybe use it for key exchange. 1966 * Don't mind errors from EVP_PKEY_derive_set_peer, because 1967 * it is completely valid to use a client certificate for 1968 * authorization only. 1969 */ 1970 if ((client_pub_pkey = X509_get_pubkey(s->session->peer)) != NULL) { 1971 if (EVP_PKEY_derive_set_peer(pkey_ctx, 1972 client_pub_pkey) <= 0) 1973 ERR_clear_error(); 1974 } 1975 1976 /* Decrypt session key */ 1977 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) 1978 goto truncated; 1979 if (CBS_len(cbs) != 0) 1980 goto truncated; 1981 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 1982 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { 1983 SSLerror(s, SSL_R_DECRYPTION_FAILED); 1984 goto gerr; 1985 } 1986 1987 /* Generate master secret */ 1988 s->session->master_key_length = 1989 tls1_generate_master_secret( 1990 s, s->session->master_key, premaster_secret, 32); 1991 1992 /* Check if pubkey from client certificate was used */ 1993 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, 1994 EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) 1995 ret = 2; 1996 else 1997 ret = 1; 1998 gerr: 1999 EVP_PKEY_free(client_pub_pkey); 2000 EVP_PKEY_CTX_free(pkey_ctx); 2001 if (ret) 2002 return (ret); 2003 else 2004 goto err; 2005 2006 truncated: 2007 al = SSL_AD_DECODE_ERROR; 2008 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2009 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2010 err: 2011 return (-1); 2012 } 2013 2014 int 2015 ssl3_get_client_key_exchange(SSL *s) 2016 { 2017 unsigned long alg_k; 2018 int al, ok; 2019 CBS cbs; 2020 long n; 2021 2022 /* 2048 maxlen is a guess. How long a key does that permit? */ 2023 n = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 2024 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok); 2025 if (!ok) 2026 return ((int)n); 2027 2028 if (n < 0) 2029 goto err; 2030 2031 CBS_init(&cbs, s->internal->init_msg, n); 2032 2033 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2034 2035 if (alg_k & SSL_kRSA) { 2036 if (ssl3_get_client_kex_rsa(s, &cbs) != 1) 2037 goto err; 2038 } else if (alg_k & SSL_kDHE) { 2039 if (ssl3_get_client_kex_dhe(s, &cbs) != 1) 2040 goto err; 2041 } else if (alg_k & SSL_kECDHE) { 2042 if (ssl3_get_client_kex_ecdhe(s, &cbs) != 1) 2043 goto err; 2044 } else if (alg_k & SSL_kGOST) { 2045 if (ssl3_get_client_kex_gost(s, &cbs) != 1) 2046 goto err; 2047 } else { 2048 al = SSL_AD_HANDSHAKE_FAILURE; 2049 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 2050 goto f_err; 2051 } 2052 2053 if (CBS_len(&cbs) != 0) { 2054 al = SSL_AD_DECODE_ERROR; 2055 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2056 goto f_err; 2057 } 2058 2059 return (1); 2060 2061 f_err: 2062 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2063 err: 2064 return (-1); 2065 } 2066 2067 int 2068 ssl3_get_cert_verify(SSL *s) 2069 { 2070 CBS cbs, signature; 2071 const struct ssl_sigalg *sigalg = NULL; 2072 const EVP_MD *md = NULL; 2073 EVP_PKEY *pkey = NULL; 2074 X509 *peer = NULL; 2075 EVP_MD_CTX mctx; 2076 int al, ok, verify; 2077 const unsigned char *hdata; 2078 size_t hdatalen; 2079 int type = 0; 2080 int ret = 0; 2081 long n; 2082 2083 EVP_MD_CTX_init(&mctx); 2084 2085 n = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 2086 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok); 2087 if (!ok) 2088 return ((int)n); 2089 2090 if (n < 0) 2091 goto err; 2092 2093 CBS_init(&cbs, s->internal->init_msg, n); 2094 2095 if (s->session->peer != NULL) { 2096 peer = s->session->peer; 2097 pkey = X509_get_pubkey(peer); 2098 type = X509_certificate_type(peer, pkey); 2099 } 2100 2101 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 2102 S3I(s)->tmp.reuse_message = 1; 2103 if (peer != NULL) { 2104 al = SSL_AD_UNEXPECTED_MESSAGE; 2105 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 2106 goto f_err; 2107 } 2108 ret = 1; 2109 goto end; 2110 } 2111 2112 if (peer == NULL) { 2113 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 2114 al = SSL_AD_UNEXPECTED_MESSAGE; 2115 goto f_err; 2116 } 2117 2118 if (!(type & EVP_PKT_SIGN)) { 2119 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 2120 al = SSL_AD_ILLEGAL_PARAMETER; 2121 goto f_err; 2122 } 2123 2124 if (S3I(s)->change_cipher_spec) { 2125 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 2126 al = SSL_AD_UNEXPECTED_MESSAGE; 2127 goto f_err; 2128 } 2129 2130 if (!SSL_USE_SIGALGS(s)) { 2131 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2132 goto err; 2133 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2134 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2135 al = SSL_AD_DECODE_ERROR; 2136 goto f_err; 2137 } 2138 if (CBS_len(&cbs) != 0) { 2139 al = SSL_AD_DECODE_ERROR; 2140 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2141 goto f_err; 2142 } 2143 } 2144 2145 if (SSL_USE_SIGALGS(s)) { 2146 EVP_PKEY_CTX *pctx; 2147 uint16_t sigalg_value; 2148 2149 if (!CBS_get_u16(&cbs, &sigalg_value)) 2150 goto truncated; 2151 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 2152 tls12_sigalgs_len)) == NULL || 2153 (md = sigalg->md()) == NULL) { 2154 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2155 al = SSL_AD_DECODE_ERROR; 2156 goto f_err; 2157 } 2158 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 2159 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 2160 al = SSL_AD_DECODE_ERROR; 2161 goto f_err; 2162 } 2163 2164 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2165 goto err; 2166 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2167 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2168 al = SSL_AD_DECODE_ERROR; 2169 goto f_err; 2170 } 2171 if (CBS_len(&cbs) != 0) { 2172 al = SSL_AD_DECODE_ERROR; 2173 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2174 goto f_err; 2175 } 2176 2177 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2178 SSLerror(s, ERR_R_INTERNAL_ERROR); 2179 al = SSL_AD_INTERNAL_ERROR; 2180 goto f_err; 2181 } 2182 if (!EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, pkey)) { 2183 SSLerror(s, ERR_R_EVP_LIB); 2184 al = SSL_AD_INTERNAL_ERROR; 2185 goto f_err; 2186 } 2187 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2188 (!EVP_PKEY_CTX_set_rsa_padding 2189 (pctx, RSA_PKCS1_PSS_PADDING) || 2190 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2191 al = SSL_AD_INTERNAL_ERROR; 2192 goto f_err; 2193 } 2194 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2195 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2196 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, 2197 NULL) <= 0) { 2198 al = SSL_AD_INTERNAL_ERROR; 2199 goto f_err; 2200 } 2201 if (!EVP_DigestVerifyUpdate(&mctx, hdata, hdatalen)) { 2202 SSLerror(s, ERR_R_EVP_LIB); 2203 al = SSL_AD_INTERNAL_ERROR; 2204 goto f_err; 2205 } 2206 if (EVP_DigestVerifyFinal(&mctx, CBS_data(&signature), 2207 CBS_len(&signature)) <= 0) { 2208 al = SSL_AD_DECRYPT_ERROR; 2209 SSLerror(s, SSL_R_BAD_SIGNATURE); 2210 goto f_err; 2211 } 2212 } else if (pkey->type == EVP_PKEY_RSA) { 2213 verify = RSA_verify(NID_md5_sha1, S3I(s)->tmp.cert_verify_md, 2214 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), 2215 CBS_len(&signature), pkey->pkey.rsa); 2216 if (verify < 0) { 2217 al = SSL_AD_DECRYPT_ERROR; 2218 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2219 goto f_err; 2220 } 2221 if (verify == 0) { 2222 al = SSL_AD_DECRYPT_ERROR; 2223 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2224 goto f_err; 2225 } 2226 } else if (pkey->type == EVP_PKEY_EC) { 2227 verify = ECDSA_verify(pkey->save_type, 2228 &(S3I(s)->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), 2229 SHA_DIGEST_LENGTH, CBS_data(&signature), 2230 CBS_len(&signature), pkey->pkey.ec); 2231 if (verify <= 0) { 2232 al = SSL_AD_DECRYPT_ERROR; 2233 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2234 goto f_err; 2235 } 2236 #ifndef OPENSSL_NO_GOST 2237 } else if (pkey->type == NID_id_GostR3410_94 || 2238 pkey->type == NID_id_GostR3410_2001) { 2239 unsigned char sigbuf[128]; 2240 unsigned int siglen = sizeof(sigbuf); 2241 EVP_PKEY_CTX *pctx; 2242 int nid; 2243 2244 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2245 SSLerror(s, ERR_R_INTERNAL_ERROR); 2246 al = SSL_AD_INTERNAL_ERROR; 2247 goto f_err; 2248 } 2249 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2250 !(md = EVP_get_digestbynid(nid))) { 2251 SSLerror(s, ERR_R_EVP_LIB); 2252 al = SSL_AD_INTERNAL_ERROR; 2253 goto f_err; 2254 } 2255 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 2256 SSLerror(s, ERR_R_EVP_LIB); 2257 al = SSL_AD_INTERNAL_ERROR; 2258 goto f_err; 2259 } 2260 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2261 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2262 !EVP_DigestFinal(&mctx, sigbuf, &siglen) || 2263 (EVP_PKEY_verify_init(pctx) <= 0) || 2264 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2265 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2266 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2267 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { 2268 SSLerror(s, ERR_R_EVP_LIB); 2269 al = SSL_AD_INTERNAL_ERROR; 2270 EVP_PKEY_CTX_free(pctx); 2271 goto f_err; 2272 } 2273 if (EVP_PKEY_verify(pctx, CBS_data(&signature), 2274 CBS_len(&signature), sigbuf, siglen) <= 0) { 2275 al = SSL_AD_DECRYPT_ERROR; 2276 SSLerror(s, SSL_R_BAD_SIGNATURE); 2277 EVP_PKEY_CTX_free(pctx); 2278 goto f_err; 2279 } 2280 2281 EVP_PKEY_CTX_free(pctx); 2282 #endif 2283 } else { 2284 SSLerror(s, ERR_R_INTERNAL_ERROR); 2285 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2286 goto f_err; 2287 } 2288 2289 ret = 1; 2290 if (0) { 2291 truncated: 2292 al = SSL_AD_DECODE_ERROR; 2293 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2294 f_err: 2295 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2296 } 2297 end: 2298 tls1_transcript_free(s); 2299 err: 2300 EVP_MD_CTX_cleanup(&mctx); 2301 EVP_PKEY_free(pkey); 2302 return (ret); 2303 } 2304 2305 int 2306 ssl3_get_client_certificate(SSL *s) 2307 { 2308 CBS cbs, client_certs; 2309 int i, ok, al, ret = -1; 2310 X509 *x = NULL; 2311 long n; 2312 const unsigned char *q; 2313 STACK_OF(X509) *sk = NULL; 2314 2315 n = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2316 -1, s->internal->max_cert_list, &ok); 2317 if (!ok) 2318 return ((int)n); 2319 2320 if (S3I(s)->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2321 if ((s->verify_mode & SSL_VERIFY_PEER) && 2322 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2323 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2324 al = SSL_AD_HANDSHAKE_FAILURE; 2325 goto f_err; 2326 } 2327 /* 2328 * If tls asked for a client cert, 2329 * the client must return a 0 list. 2330 */ 2331 if (S3I(s)->tmp.cert_request) { 2332 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 2333 ); 2334 al = SSL_AD_UNEXPECTED_MESSAGE; 2335 goto f_err; 2336 } 2337 S3I(s)->tmp.reuse_message = 1; 2338 return (1); 2339 } 2340 2341 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 2342 al = SSL_AD_UNEXPECTED_MESSAGE; 2343 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2344 goto f_err; 2345 } 2346 2347 if (n < 0) 2348 goto truncated; 2349 2350 CBS_init(&cbs, s->internal->init_msg, n); 2351 2352 if ((sk = sk_X509_new_null()) == NULL) { 2353 SSLerror(s, ERR_R_MALLOC_FAILURE); 2354 goto err; 2355 } 2356 2357 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) || 2358 CBS_len(&cbs) != 0) 2359 goto truncated; 2360 2361 while (CBS_len(&client_certs) > 0) { 2362 CBS cert; 2363 2364 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) { 2365 al = SSL_AD_DECODE_ERROR; 2366 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2367 goto f_err; 2368 } 2369 2370 q = CBS_data(&cert); 2371 x = d2i_X509(NULL, &q, CBS_len(&cert)); 2372 if (x == NULL) { 2373 SSLerror(s, ERR_R_ASN1_LIB); 2374 goto err; 2375 } 2376 if (q != CBS_data(&cert) + CBS_len(&cert)) { 2377 al = SSL_AD_DECODE_ERROR; 2378 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2379 goto f_err; 2380 } 2381 if (!sk_X509_push(sk, x)) { 2382 SSLerror(s, ERR_R_MALLOC_FAILURE); 2383 goto err; 2384 } 2385 x = NULL; 2386 } 2387 2388 if (sk_X509_num(sk) <= 0) { 2389 /* 2390 * TLS does not mind 0 certs returned. 2391 * Fail for TLS only if we required a certificate. 2392 */ 2393 if ((s->verify_mode & SSL_VERIFY_PEER) && 2394 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2395 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2396 al = SSL_AD_HANDSHAKE_FAILURE; 2397 goto f_err; 2398 } 2399 /* No client certificate so free transcript. */ 2400 tls1_transcript_free(s); 2401 } else { 2402 i = ssl_verify_cert_chain(s, sk); 2403 if (i <= 0) { 2404 al = ssl_verify_alarm_type(s->verify_result); 2405 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2406 goto f_err; 2407 } 2408 } 2409 2410 X509_free(s->session->peer); 2411 s->session->peer = sk_X509_shift(sk); 2412 s->session->verify_result = s->verify_result; 2413 2414 /* 2415 * With the current implementation, sess_cert will always be NULL 2416 * when we arrive here 2417 */ 2418 if (SSI(s)->sess_cert == NULL) { 2419 SSI(s)->sess_cert = ssl_sess_cert_new(); 2420 if (SSI(s)->sess_cert == NULL) { 2421 SSLerror(s, ERR_R_MALLOC_FAILURE); 2422 goto err; 2423 } 2424 } 2425 sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free); 2426 SSI(s)->sess_cert->cert_chain = sk; 2427 2428 /* 2429 * Inconsistency alert: cert_chain does *not* include the 2430 * peer's own certificate, while we do include it in s3_clnt.c 2431 */ 2432 2433 sk = NULL; 2434 2435 ret = 1; 2436 if (0) { 2437 truncated: 2438 al = SSL_AD_DECODE_ERROR; 2439 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2440 f_err: 2441 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2442 } 2443 err: 2444 X509_free(x); 2445 sk_X509_pop_free(sk, X509_free); 2446 2447 return (ret); 2448 } 2449 2450 int 2451 ssl3_send_server_certificate(SSL *s) 2452 { 2453 CBB cbb, server_cert; 2454 CERT_PKEY *cpk; 2455 2456 /* 2457 * Server Certificate - RFC 5246, section 7.4.2. 2458 */ 2459 2460 memset(&cbb, 0, sizeof(cbb)); 2461 2462 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) { 2463 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { 2464 SSLerror(s, ERR_R_INTERNAL_ERROR); 2465 return (0); 2466 } 2467 2468 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, 2469 SSL3_MT_CERTIFICATE)) 2470 goto err; 2471 if (!ssl3_output_cert_chain(s, &server_cert, cpk)) 2472 goto err; 2473 if (!ssl3_handshake_msg_finish(s, &cbb)) 2474 goto err; 2475 2476 S3I(s)->hs.state = SSL3_ST_SW_CERT_B; 2477 } 2478 2479 /* SSL3_ST_SW_CERT_B */ 2480 return (ssl3_handshake_write(s)); 2481 2482 err: 2483 CBB_cleanup(&cbb); 2484 2485 return (0); 2486 } 2487 2488 /* send a new session ticket (not necessarily for a new session) */ 2489 int 2490 ssl3_send_newsession_ticket(SSL *s) 2491 { 2492 CBB cbb, session_ticket, ticket; 2493 SSL_CTX *tctx = s->initial_ctx; 2494 size_t enc_session_len, enc_session_max_len, hmac_len; 2495 size_t session_len = 0; 2496 unsigned char *enc_session = NULL, *session = NULL; 2497 unsigned char iv[EVP_MAX_IV_LENGTH]; 2498 unsigned char key_name[16]; 2499 unsigned char *hmac; 2500 unsigned int hlen; 2501 EVP_CIPHER_CTX ctx; 2502 HMAC_CTX hctx; 2503 int len; 2504 2505 /* 2506 * New Session Ticket - RFC 5077, section 3.3. 2507 */ 2508 2509 EVP_CIPHER_CTX_init(&ctx); 2510 HMAC_CTX_init(&hctx); 2511 2512 memset(&cbb, 0, sizeof(cbb)); 2513 2514 if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2515 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, 2516 SSL3_MT_NEWSESSION_TICKET)) 2517 goto err; 2518 2519 if (!SSL_SESSION_ticket(s->session, &session, &session_len)) 2520 goto err; 2521 if (session_len > 0xffff) 2522 goto err; 2523 2524 /* 2525 * Initialize HMAC and cipher contexts. If callback is present 2526 * it does all the work, otherwise use generated values from 2527 * parent context. 2528 */ 2529 if (tctx->internal->tlsext_ticket_key_cb != NULL) { 2530 if (tctx->internal->tlsext_ticket_key_cb(s, 2531 key_name, iv, &ctx, &hctx, 1) < 0) { 2532 EVP_CIPHER_CTX_cleanup(&ctx); 2533 goto err; 2534 } 2535 } else { 2536 arc4random_buf(iv, 16); 2537 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 2538 tctx->internal->tlsext_tick_aes_key, iv); 2539 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key, 2540 16, EVP_sha256(), NULL); 2541 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); 2542 } 2543 2544 /* Encrypt the session state. */ 2545 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; 2546 if ((enc_session = calloc(1, enc_session_max_len)) == NULL) 2547 goto err; 2548 enc_session_len = 0; 2549 if (!EVP_EncryptUpdate(&ctx, enc_session, &len, session, 2550 session_len)) 2551 goto err; 2552 enc_session_len += len; 2553 if (!EVP_EncryptFinal_ex(&ctx, enc_session + enc_session_len, 2554 &len)) 2555 goto err; 2556 enc_session_len += len; 2557 2558 if (enc_session_len > enc_session_max_len) 2559 goto err; 2560 2561 /* Generate the HMAC. */ 2562 if (!HMAC_Update(&hctx, key_name, sizeof(key_name))) 2563 goto err; 2564 if (!HMAC_Update(&hctx, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2565 goto err; 2566 if (!HMAC_Update(&hctx, enc_session, enc_session_len)) 2567 goto err; 2568 2569 if ((hmac_len = HMAC_size(&hctx)) <= 0) 2570 goto err; 2571 2572 /* 2573 * Ticket lifetime hint (advisory only): 2574 * We leave this unspecified for resumed session 2575 * (for simplicity), and guess that tickets for new 2576 * sessions will live as long as their sessions. 2577 */ 2578 if (!CBB_add_u32(&session_ticket, 2579 s->internal->hit ? 0 : s->session->timeout)) 2580 goto err; 2581 2582 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) 2583 goto err; 2584 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) 2585 goto err; 2586 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2587 goto err; 2588 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) 2589 goto err; 2590 if (!CBB_add_space(&ticket, &hmac, hmac_len)) 2591 goto err; 2592 2593 if (!HMAC_Final(&hctx, hmac, &hlen)) 2594 goto err; 2595 if (hlen != hmac_len) 2596 goto err; 2597 2598 if (!ssl3_handshake_msg_finish(s, &cbb)) 2599 goto err; 2600 2601 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2602 } 2603 2604 EVP_CIPHER_CTX_cleanup(&ctx); 2605 HMAC_CTX_cleanup(&hctx); 2606 freezero(session, session_len); 2607 free(enc_session); 2608 2609 /* SSL3_ST_SW_SESSION_TICKET_B */ 2610 return (ssl3_handshake_write(s)); 2611 2612 err: 2613 CBB_cleanup(&cbb); 2614 EVP_CIPHER_CTX_cleanup(&ctx); 2615 HMAC_CTX_cleanup(&hctx); 2616 freezero(session, session_len); 2617 free(enc_session); 2618 2619 return (-1); 2620 } 2621 2622 int 2623 ssl3_send_cert_status(SSL *s) 2624 { 2625 CBB cbb, certstatus, ocspresp; 2626 2627 memset(&cbb, 0, sizeof(cbb)); 2628 2629 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2630 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, 2631 SSL3_MT_CERTIFICATE_STATUS)) 2632 goto err; 2633 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2634 goto err; 2635 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2636 goto err; 2637 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, 2638 s->internal->tlsext_ocsp_resp_len)) 2639 goto err; 2640 if (!ssl3_handshake_msg_finish(s, &cbb)) 2641 goto err; 2642 2643 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2644 } 2645 2646 /* SSL3_ST_SW_CERT_STATUS_B */ 2647 return (ssl3_handshake_write(s)); 2648 2649 err: 2650 CBB_cleanup(&cbb); 2651 2652 return (-1); 2653 } 2654