1 /* $OpenBSD: ssl_srvr.c,v 1.88 2020/10/14 16:57:33 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 = ssl3_send_dtls_hello_verify_request(s); 365 if (ret <= 0) 366 goto end; 367 S3I(s)->hs.state = SSL3_ST_SW_FLUSH; 368 S3I(s)->hs.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_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_dtls_hello_verify_request(SSL *s) 1169 { 1170 CBB cbb, verify, cookie; 1171 1172 memset(&cbb, 0, sizeof(cbb)); 1173 1174 if (S3I(s)->hs.state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 1175 if (s->ctx->internal->app_gen_cookie_cb == NULL || 1176 s->ctx->internal->app_gen_cookie_cb(s, D1I(s)->cookie, 1177 &(D1I(s)->cookie_len)) == 0) { 1178 SSLerror(s, ERR_R_INTERNAL_ERROR); 1179 return 0; 1180 } 1181 1182 if (!ssl3_handshake_msg_start(s, &cbb, &verify, 1183 DTLS1_MT_HELLO_VERIFY_REQUEST)) 1184 goto err; 1185 if (!CBB_add_u16(&verify, s->version)) 1186 goto err; 1187 if (!CBB_add_u8_length_prefixed(&verify, &cookie)) 1188 goto err; 1189 if (!CBB_add_bytes(&cookie, D1I(s)->cookie, D1I(s)->cookie_len)) 1190 goto err; 1191 if (!ssl3_handshake_msg_finish(s, &cbb)) 1192 goto err; 1193 1194 S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 1195 } 1196 1197 /* S3I(s)->hs.state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 1198 return (ssl3_handshake_write(s)); 1199 1200 err: 1201 CBB_cleanup(&cbb); 1202 1203 return (-1); 1204 } 1205 1206 int 1207 ssl3_send_server_hello(SSL *s) 1208 { 1209 CBB cbb, server_hello, session_id; 1210 size_t sl; 1211 1212 memset(&cbb, 0, sizeof(cbb)); 1213 1214 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_HELLO_A) { 1215 if (!ssl3_handshake_msg_start(s, &cbb, &server_hello, 1216 SSL3_MT_SERVER_HELLO)) 1217 goto err; 1218 1219 if (!CBB_add_u16(&server_hello, s->version)) 1220 goto err; 1221 if (!CBB_add_bytes(&server_hello, s->s3->server_random, 1222 sizeof(s->s3->server_random))) 1223 goto err; 1224 1225 /* 1226 * There are several cases for the session ID to send 1227 * back in the server hello: 1228 * 1229 * - For session reuse from the session cache, 1230 * we send back the old session ID. 1231 * - If stateless session reuse (using a session ticket) 1232 * is successful, we send back the client's "session ID" 1233 * (which doesn't actually identify the session). 1234 * - If it is a new session, we send back the new 1235 * session ID. 1236 * - However, if we want the new session to be single-use, 1237 * we send back a 0-length session ID. 1238 * 1239 * s->internal->hit is non-zero in either case of session reuse, 1240 * so the following won't overwrite an ID that we're supposed 1241 * to send back. 1242 */ 1243 if (!(s->ctx->internal->session_cache_mode & SSL_SESS_CACHE_SERVER) 1244 && !s->internal->hit) 1245 s->session->session_id_length = 0; 1246 1247 sl = s->session->session_id_length; 1248 if (sl > sizeof(s->session->session_id)) { 1249 SSLerror(s, ERR_R_INTERNAL_ERROR); 1250 goto err; 1251 } 1252 if (!CBB_add_u8_length_prefixed(&server_hello, &session_id)) 1253 goto err; 1254 if (!CBB_add_bytes(&session_id, s->session->session_id, sl)) 1255 goto err; 1256 1257 /* Cipher suite. */ 1258 if (!CBB_add_u16(&server_hello, 1259 ssl3_cipher_get_value(S3I(s)->hs.new_cipher))) 1260 goto err; 1261 1262 /* Compression method (null). */ 1263 if (!CBB_add_u8(&server_hello, 0)) 1264 goto err; 1265 1266 /* TLS extensions */ 1267 if (!tlsext_server_build(s, SSL_TLSEXT_MSG_SH, &server_hello)) { 1268 SSLerror(s, ERR_R_INTERNAL_ERROR); 1269 goto err; 1270 } 1271 1272 if (!ssl3_handshake_msg_finish(s, &cbb)) 1273 goto err; 1274 } 1275 1276 /* SSL3_ST_SW_SRVR_HELLO_B */ 1277 return (ssl3_handshake_write(s)); 1278 1279 err: 1280 CBB_cleanup(&cbb); 1281 1282 return (-1); 1283 } 1284 1285 int 1286 ssl3_send_server_done(SSL *s) 1287 { 1288 CBB cbb, done; 1289 1290 memset(&cbb, 0, sizeof(cbb)); 1291 1292 if (S3I(s)->hs.state == SSL3_ST_SW_SRVR_DONE_A) { 1293 if (!ssl3_handshake_msg_start(s, &cbb, &done, 1294 SSL3_MT_SERVER_DONE)) 1295 goto err; 1296 if (!ssl3_handshake_msg_finish(s, &cbb)) 1297 goto err; 1298 1299 S3I(s)->hs.state = SSL3_ST_SW_SRVR_DONE_B; 1300 } 1301 1302 /* SSL3_ST_SW_SRVR_DONE_B */ 1303 return (ssl3_handshake_write(s)); 1304 1305 err: 1306 CBB_cleanup(&cbb); 1307 1308 return (-1); 1309 } 1310 1311 static int 1312 ssl3_send_server_kex_dhe(SSL *s, CBB *cbb) 1313 { 1314 CBB dh_p, dh_g, dh_Ys; 1315 DH *dh = NULL, *dhp; 1316 unsigned char *data; 1317 int al; 1318 1319 if (s->cert->dh_tmp_auto != 0) { 1320 if ((dhp = ssl_get_auto_dh(s)) == NULL) { 1321 al = SSL_AD_INTERNAL_ERROR; 1322 SSLerror(s, ERR_R_INTERNAL_ERROR); 1323 goto f_err; 1324 } 1325 } else 1326 dhp = s->cert->dh_tmp; 1327 1328 if (dhp == NULL && s->cert->dh_tmp_cb != NULL) 1329 dhp = s->cert->dh_tmp_cb(s, 0, 1330 SSL_C_PKEYLENGTH(S3I(s)->hs.new_cipher)); 1331 1332 if (dhp == NULL) { 1333 al = SSL_AD_HANDSHAKE_FAILURE; 1334 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1335 goto f_err; 1336 } 1337 1338 if (S3I(s)->tmp.dh != NULL) { 1339 SSLerror(s, ERR_R_INTERNAL_ERROR); 1340 goto err; 1341 } 1342 1343 if (s->cert->dh_tmp_auto != 0) { 1344 dh = dhp; 1345 } else if ((dh = DHparams_dup(dhp)) == NULL) { 1346 SSLerror(s, ERR_R_DH_LIB); 1347 goto err; 1348 } 1349 S3I(s)->tmp.dh = dh; 1350 if (!DH_generate_key(dh)) { 1351 SSLerror(s, ERR_R_DH_LIB); 1352 goto err; 1353 } 1354 1355 /* 1356 * Serialize the DH parameters and public key. 1357 */ 1358 if (!CBB_add_u16_length_prefixed(cbb, &dh_p)) 1359 goto err; 1360 if (!CBB_add_space(&dh_p, &data, BN_num_bytes(dh->p))) 1361 goto err; 1362 BN_bn2bin(dh->p, data); 1363 1364 if (!CBB_add_u16_length_prefixed(cbb, &dh_g)) 1365 goto err; 1366 if (!CBB_add_space(&dh_g, &data, BN_num_bytes(dh->g))) 1367 goto err; 1368 BN_bn2bin(dh->g, data); 1369 1370 if (!CBB_add_u16_length_prefixed(cbb, &dh_Ys)) 1371 goto err; 1372 if (!CBB_add_space(&dh_Ys, &data, BN_num_bytes(dh->pub_key))) 1373 goto err; 1374 BN_bn2bin(dh->pub_key, data); 1375 1376 if (!CBB_flush(cbb)) 1377 goto err; 1378 1379 return (1); 1380 1381 f_err: 1382 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1383 err: 1384 return (-1); 1385 } 1386 1387 static int 1388 ssl3_send_server_kex_ecdhe_ecp(SSL *s, int nid, CBB *cbb) 1389 { 1390 uint16_t curve_id; 1391 EC_KEY *ecdh; 1392 CBB ecpoint; 1393 int al; 1394 1395 /* 1396 * Only named curves are supported in ECDH ephemeral key exchanges. 1397 * For supported named curves, curve_id is non-zero. 1398 */ 1399 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1400 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1401 goto err; 1402 } 1403 1404 if (S3I(s)->tmp.ecdh != NULL) { 1405 SSLerror(s, ERR_R_INTERNAL_ERROR); 1406 goto err; 1407 } 1408 1409 if ((S3I(s)->tmp.ecdh = EC_KEY_new()) == NULL) { 1410 al = SSL_AD_HANDSHAKE_FAILURE; 1411 SSLerror(s, SSL_R_MISSING_TMP_ECDH_KEY); 1412 goto f_err; 1413 } 1414 S3I(s)->tmp.ecdh_nid = nid; 1415 ecdh = S3I(s)->tmp.ecdh; 1416 1417 if (!ssl_kex_generate_ecdhe_ecp(ecdh, nid)) 1418 goto err; 1419 1420 /* 1421 * Encode the public key. 1422 * 1423 * Only named curves are supported in ECDH ephemeral key exchanges. 1424 * In this case the ServerKeyExchange message has: 1425 * [1 byte CurveType], [2 byte CurveName] 1426 * [1 byte length of encoded point], followed by 1427 * the actual encoded point itself. 1428 */ 1429 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1430 goto err; 1431 if (!CBB_add_u16(cbb, curve_id)) 1432 goto err; 1433 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1434 goto err; 1435 if (!ssl_kex_public_ecdhe_ecp(ecdh, &ecpoint)) 1436 goto err; 1437 if (!CBB_flush(cbb)) 1438 goto err; 1439 1440 return (1); 1441 1442 f_err: 1443 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1444 err: 1445 return (-1); 1446 } 1447 1448 static int 1449 ssl3_send_server_kex_ecdhe_ecx(SSL *s, int nid, CBB *cbb) 1450 { 1451 uint8_t *public_key = NULL, *private_key = NULL; 1452 uint16_t curve_id; 1453 CBB ecpoint; 1454 int ret = -1; 1455 1456 /* Generate an X25519 key pair. */ 1457 if (S3I(s)->tmp.x25519 != NULL) { 1458 SSLerror(s, ERR_R_INTERNAL_ERROR); 1459 goto err; 1460 } 1461 if ((private_key = malloc(X25519_KEY_LENGTH)) == NULL) 1462 goto err; 1463 if ((public_key = malloc(X25519_KEY_LENGTH)) == NULL) 1464 goto err; 1465 X25519_keypair(public_key, private_key); 1466 1467 /* Serialize public key. */ 1468 if ((curve_id = tls1_ec_nid2curve_id(nid)) == 0) { 1469 SSLerror(s, SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1470 goto err; 1471 } 1472 1473 if (!CBB_add_u8(cbb, NAMED_CURVE_TYPE)) 1474 goto err; 1475 if (!CBB_add_u16(cbb, curve_id)) 1476 goto err; 1477 if (!CBB_add_u8_length_prefixed(cbb, &ecpoint)) 1478 goto err; 1479 if (!CBB_add_bytes(&ecpoint, public_key, X25519_KEY_LENGTH)) 1480 goto err; 1481 if (!CBB_flush(cbb)) 1482 goto err; 1483 1484 S3I(s)->tmp.x25519 = private_key; 1485 private_key = NULL; 1486 ret = 1; 1487 1488 err: 1489 free(public_key); 1490 freezero(private_key, X25519_KEY_LENGTH); 1491 1492 return (ret); 1493 } 1494 1495 static int 1496 ssl3_send_server_kex_ecdhe(SSL *s, CBB *cbb) 1497 { 1498 int nid; 1499 1500 nid = tls1_get_shared_curve(s); 1501 1502 if (nid == NID_X25519) 1503 return ssl3_send_server_kex_ecdhe_ecx(s, nid, cbb); 1504 1505 return ssl3_send_server_kex_ecdhe_ecp(s, nid, cbb); 1506 } 1507 1508 int 1509 ssl3_send_server_key_exchange(SSL *s) 1510 { 1511 CBB cbb, cbb_params, cbb_signature, server_kex; 1512 const struct ssl_sigalg *sigalg = NULL; 1513 unsigned char *signature = NULL; 1514 size_t signature_len = 0; 1515 unsigned char *params = NULL; 1516 size_t params_len; 1517 const EVP_MD *md = NULL; 1518 unsigned long type; 1519 EVP_MD_CTX md_ctx; 1520 EVP_PKEY_CTX *pctx; 1521 EVP_PKEY *pkey; 1522 int al; 1523 1524 memset(&cbb, 0, sizeof(cbb)); 1525 memset(&cbb_params, 0, sizeof(cbb_params)); 1526 1527 EVP_MD_CTX_init(&md_ctx); 1528 1529 if (S3I(s)->hs.state == SSL3_ST_SW_KEY_EXCH_A) { 1530 1531 if (!ssl3_handshake_msg_start(s, &cbb, &server_kex, 1532 SSL3_MT_SERVER_KEY_EXCHANGE)) 1533 goto err; 1534 1535 if (!CBB_init(&cbb_params, 0)) 1536 goto err; 1537 1538 type = S3I(s)->hs.new_cipher->algorithm_mkey; 1539 if (type & SSL_kDHE) { 1540 if (ssl3_send_server_kex_dhe(s, &cbb_params) != 1) 1541 goto err; 1542 } else if (type & SSL_kECDHE) { 1543 if (ssl3_send_server_kex_ecdhe(s, &cbb_params) != 1) 1544 goto err; 1545 } else { 1546 al = SSL_AD_HANDSHAKE_FAILURE; 1547 SSLerror(s, SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1548 goto f_err; 1549 } 1550 1551 if (!CBB_finish(&cbb_params, ¶ms, ¶ms_len)) 1552 goto err; 1553 1554 if (!CBB_add_bytes(&server_kex, params, params_len)) 1555 goto err; 1556 1557 /* Add signature unless anonymous. */ 1558 if (!(S3I(s)->hs.new_cipher->algorithm_auth & SSL_aNULL)) { 1559 if ((pkey = ssl_get_sign_pkey(s, S3I(s)->hs.new_cipher, 1560 &md, &sigalg)) == NULL) { 1561 al = SSL_AD_DECODE_ERROR; 1562 goto f_err; 1563 } 1564 1565 /* Send signature algorithm. */ 1566 if (SSL_USE_SIGALGS(s)) { 1567 if (!CBB_add_u16(&server_kex, sigalg->value)) { 1568 al = SSL_AD_INTERNAL_ERROR; 1569 SSLerror(s, ERR_R_INTERNAL_ERROR); 1570 goto f_err; 1571 } 1572 } 1573 1574 if (!EVP_DigestSignInit(&md_ctx, &pctx, md, NULL, pkey)) { 1575 SSLerror(s, ERR_R_EVP_LIB); 1576 goto err; 1577 } 1578 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 1579 (!EVP_PKEY_CTX_set_rsa_padding(pctx, 1580 RSA_PKCS1_PSS_PADDING) || 1581 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 1582 SSLerror(s, ERR_R_EVP_LIB); 1583 goto err; 1584 } 1585 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->client_random, 1586 SSL3_RANDOM_SIZE)) { 1587 SSLerror(s, ERR_R_EVP_LIB); 1588 goto err; 1589 } 1590 if (!EVP_DigestSignUpdate(&md_ctx, s->s3->server_random, 1591 SSL3_RANDOM_SIZE)) { 1592 SSLerror(s, ERR_R_EVP_LIB); 1593 goto err; 1594 } 1595 if (!EVP_DigestSignUpdate(&md_ctx, params, params_len)) { 1596 SSLerror(s, ERR_R_EVP_LIB); 1597 goto err; 1598 } 1599 if (!EVP_DigestSignFinal(&md_ctx, NULL, &signature_len) || 1600 !signature_len) { 1601 SSLerror(s, ERR_R_EVP_LIB); 1602 goto err; 1603 } 1604 if ((signature = calloc(1, signature_len)) == NULL) { 1605 SSLerror(s, ERR_R_MALLOC_FAILURE); 1606 goto err; 1607 } 1608 if (!EVP_DigestSignFinal(&md_ctx, signature, &signature_len)) { 1609 SSLerror(s, ERR_R_EVP_LIB); 1610 goto err; 1611 } 1612 1613 if (!CBB_add_u16_length_prefixed(&server_kex, 1614 &cbb_signature)) 1615 goto err; 1616 if (!CBB_add_bytes(&cbb_signature, signature, 1617 signature_len)) 1618 goto err; 1619 } 1620 1621 if (!ssl3_handshake_msg_finish(s, &cbb)) 1622 goto err; 1623 1624 S3I(s)->hs.state = SSL3_ST_SW_KEY_EXCH_B; 1625 } 1626 1627 EVP_MD_CTX_cleanup(&md_ctx); 1628 free(params); 1629 free(signature); 1630 1631 return (ssl3_handshake_write(s)); 1632 1633 f_err: 1634 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1635 err: 1636 CBB_cleanup(&cbb_params); 1637 CBB_cleanup(&cbb); 1638 EVP_MD_CTX_cleanup(&md_ctx); 1639 free(params); 1640 free(signature); 1641 1642 return (-1); 1643 } 1644 1645 int 1646 ssl3_send_certificate_request(SSL *s) 1647 { 1648 CBB cbb, cert_request, cert_types, sigalgs, cert_auth, dn; 1649 STACK_OF(X509_NAME) *sk = NULL; 1650 X509_NAME *name; 1651 int i; 1652 1653 /* 1654 * Certificate Request - RFC 5246 section 7.4.4. 1655 */ 1656 1657 memset(&cbb, 0, sizeof(cbb)); 1658 1659 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_REQ_A) { 1660 if (!ssl3_handshake_msg_start(s, &cbb, &cert_request, 1661 SSL3_MT_CERTIFICATE_REQUEST)) 1662 goto err; 1663 1664 if (!CBB_add_u8_length_prefixed(&cert_request, &cert_types)) 1665 goto err; 1666 if (!ssl3_get_req_cert_types(s, &cert_types)) 1667 goto err; 1668 1669 if (SSL_USE_SIGALGS(s)) { 1670 if (!CBB_add_u16_length_prefixed(&cert_request, &sigalgs)) 1671 goto err; 1672 if (!ssl_sigalgs_build(&sigalgs, tls12_sigalgs, tls12_sigalgs_len)) 1673 goto err; 1674 } 1675 1676 if (!CBB_add_u16_length_prefixed(&cert_request, &cert_auth)) 1677 goto err; 1678 1679 sk = SSL_get_client_CA_list(s); 1680 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1681 unsigned char *name_data; 1682 size_t name_len; 1683 1684 name = sk_X509_NAME_value(sk, i); 1685 name_len = i2d_X509_NAME(name, NULL); 1686 1687 if (!CBB_add_u16_length_prefixed(&cert_auth, &dn)) 1688 goto err; 1689 if (!CBB_add_space(&dn, &name_data, name_len)) 1690 goto err; 1691 if (i2d_X509_NAME(name, &name_data) != name_len) 1692 goto err; 1693 } 1694 1695 if (!ssl3_handshake_msg_finish(s, &cbb)) 1696 goto err; 1697 1698 S3I(s)->hs.state = SSL3_ST_SW_CERT_REQ_B; 1699 } 1700 1701 /* SSL3_ST_SW_CERT_REQ_B */ 1702 return (ssl3_handshake_write(s)); 1703 1704 err: 1705 CBB_cleanup(&cbb); 1706 1707 return (-1); 1708 } 1709 1710 static int 1711 ssl3_get_client_kex_rsa(SSL *s, CBS *cbs) 1712 { 1713 unsigned char fakekey[SSL_MAX_MASTER_KEY_LENGTH]; 1714 unsigned char *pms = NULL; 1715 unsigned char *p; 1716 size_t pms_len = 0; 1717 EVP_PKEY *pkey = NULL; 1718 RSA *rsa = NULL; 1719 CBS enc_pms; 1720 int decrypt_len; 1721 int al = -1; 1722 1723 arc4random_buf(fakekey, sizeof(fakekey)); 1724 fakekey[0] = s->client_version >> 8; 1725 fakekey[1] = s->client_version & 0xff; 1726 1727 pkey = s->cert->pkeys[SSL_PKEY_RSA].privatekey; 1728 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA) || 1729 (pkey->pkey.rsa == NULL)) { 1730 al = SSL_AD_HANDSHAKE_FAILURE; 1731 SSLerror(s, SSL_R_MISSING_RSA_CERTIFICATE); 1732 goto f_err; 1733 } 1734 rsa = pkey->pkey.rsa; 1735 1736 pms_len = RSA_size(rsa); 1737 if (pms_len < SSL_MAX_MASTER_KEY_LENGTH) 1738 goto err; 1739 if ((pms = malloc(pms_len)) == NULL) 1740 goto err; 1741 p = pms; 1742 1743 if (!CBS_get_u16_length_prefixed(cbs, &enc_pms)) 1744 goto truncated; 1745 if (CBS_len(cbs) != 0 || CBS_len(&enc_pms) != RSA_size(rsa)) { 1746 SSLerror(s, SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); 1747 goto err; 1748 } 1749 1750 decrypt_len = RSA_private_decrypt(CBS_len(&enc_pms), CBS_data(&enc_pms), 1751 pms, rsa, RSA_PKCS1_PADDING); 1752 1753 ERR_clear_error(); 1754 1755 if (decrypt_len != SSL_MAX_MASTER_KEY_LENGTH) { 1756 al = SSL_AD_DECODE_ERROR; 1757 /* SSLerror(s, SSL_R_BAD_RSA_DECRYPT); */ 1758 } 1759 1760 if ((al == -1) && !((pms[0] == (s->client_version >> 8)) && 1761 (pms[1] == (s->client_version & 0xff)))) { 1762 /* 1763 * The premaster secret must contain the same version number 1764 * as the ClientHello to detect version rollback attacks 1765 * (strangely, the protocol does not offer such protection for 1766 * DH ciphersuites). 1767 * 1768 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack 1769 * (http://eprint.iacr.org/2003/052/) exploits the version 1770 * number check as a "bad version oracle" -- an alert would 1771 * reveal that the plaintext corresponding to some ciphertext 1772 * made up by the adversary is properly formatted except that 1773 * the version number is wrong. To avoid such attacks, we should 1774 * treat this just like any other decryption error. 1775 */ 1776 al = SSL_AD_DECODE_ERROR; 1777 /* SSLerror(s, SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */ 1778 } 1779 1780 if (al != -1) { 1781 /* 1782 * Some decryption failure -- use random value instead 1783 * as countermeasure against Bleichenbacher's attack 1784 * on PKCS #1 v1.5 RSA padding (see RFC 2246, 1785 * section 7.4.7.1). 1786 */ 1787 p = fakekey; 1788 } 1789 1790 s->session->master_key_length = 1791 tls1_generate_master_secret(s, 1792 s->session->master_key, p, SSL_MAX_MASTER_KEY_LENGTH); 1793 1794 freezero(pms, pms_len); 1795 1796 return (1); 1797 1798 truncated: 1799 al = SSL_AD_DECODE_ERROR; 1800 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1801 f_err: 1802 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1803 err: 1804 freezero(pms, pms_len); 1805 1806 return (-1); 1807 } 1808 1809 static int 1810 ssl3_get_client_kex_dhe(SSL *s, CBS *cbs) 1811 { 1812 int key_size = 0; 1813 int key_is_invalid, key_len, al; 1814 unsigned char *key = NULL; 1815 BIGNUM *bn = NULL; 1816 CBS dh_Yc; 1817 DH *dh; 1818 1819 if (!CBS_get_u16_length_prefixed(cbs, &dh_Yc)) 1820 goto truncated; 1821 if (CBS_len(cbs) != 0) 1822 goto truncated; 1823 1824 if (S3I(s)->tmp.dh == NULL) { 1825 al = SSL_AD_HANDSHAKE_FAILURE; 1826 SSLerror(s, SSL_R_MISSING_TMP_DH_KEY); 1827 goto f_err; 1828 } 1829 dh = S3I(s)->tmp.dh; 1830 1831 if ((bn = BN_bin2bn(CBS_data(&dh_Yc), CBS_len(&dh_Yc), NULL)) == NULL) { 1832 SSLerror(s, SSL_R_BN_LIB); 1833 goto err; 1834 } 1835 1836 if ((key_size = DH_size(dh)) <= 0) { 1837 SSLerror(s, ERR_R_DH_LIB); 1838 goto err; 1839 } 1840 if ((key = malloc(key_size)) == NULL) { 1841 SSLerror(s, ERR_R_MALLOC_FAILURE); 1842 goto err; 1843 } 1844 if (!DH_check_pub_key(dh, bn, &key_is_invalid)) { 1845 al = SSL_AD_INTERNAL_ERROR; 1846 SSLerror(s, ERR_R_DH_LIB); 1847 goto f_err; 1848 } 1849 if (key_is_invalid) { 1850 al = SSL_AD_ILLEGAL_PARAMETER; 1851 SSLerror(s, ERR_R_DH_LIB); 1852 goto f_err; 1853 } 1854 if ((key_len = DH_compute_key(key, bn, dh)) <= 0) { 1855 al = SSL_AD_INTERNAL_ERROR; 1856 SSLerror(s, ERR_R_DH_LIB); 1857 goto f_err; 1858 } 1859 1860 s->session->master_key_length = tls1_generate_master_secret(s, 1861 s->session->master_key, key, key_len); 1862 1863 DH_free(S3I(s)->tmp.dh); 1864 S3I(s)->tmp.dh = NULL; 1865 1866 freezero(key, key_size); 1867 BN_clear_free(bn); 1868 1869 return (1); 1870 1871 truncated: 1872 al = SSL_AD_DECODE_ERROR; 1873 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 1874 f_err: 1875 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1876 err: 1877 freezero(key, key_size); 1878 BN_clear_free(bn); 1879 1880 return (-1); 1881 } 1882 1883 static int 1884 ssl3_get_client_kex_ecdhe_ecp(SSL *s, CBS *cbs) 1885 { 1886 uint8_t *key = NULL; 1887 size_t key_len = 0; 1888 EC_KEY *ecdh_peer = NULL; 1889 EC_KEY *ecdh; 1890 CBS public; 1891 int ret = -1; 1892 1893 /* 1894 * Use the ephemeral values we saved when generating the 1895 * ServerKeyExchange message. 1896 */ 1897 if ((ecdh = S3I(s)->tmp.ecdh) == NULL) { 1898 SSLerror(s, ERR_R_INTERNAL_ERROR); 1899 goto err; 1900 } 1901 1902 /* 1903 * Get client's public key from encoded point in the ClientKeyExchange 1904 * message. 1905 */ 1906 if (!CBS_get_u8_length_prefixed(cbs, &public)) 1907 goto err; 1908 if (CBS_len(cbs) != 0) 1909 goto err; 1910 1911 if ((ecdh_peer = EC_KEY_new()) == NULL) 1912 goto err; 1913 1914 if (!ssl_kex_peer_public_ecdhe_ecp(ecdh_peer, S3I(s)->tmp.ecdh_nid, 1915 &public)) 1916 goto err; 1917 1918 /* Derive the shared secret and compute master secret. */ 1919 if (!ssl_kex_derive_ecdhe_ecp(ecdh, ecdh_peer, &key, &key_len)) 1920 goto err; 1921 s->session->master_key_length = tls1_generate_master_secret(s, 1922 s->session->master_key, key, key_len); 1923 1924 EC_KEY_free(S3I(s)->tmp.ecdh); 1925 S3I(s)->tmp.ecdh = NULL; 1926 S3I(s)->tmp.ecdh_nid = NID_undef; 1927 1928 ret = 1; 1929 1930 err: 1931 freezero(key, key_len); 1932 EC_KEY_free(ecdh_peer); 1933 1934 return (ret); 1935 } 1936 1937 static int 1938 ssl3_get_client_kex_ecdhe_ecx(SSL *s, CBS *cbs) 1939 { 1940 uint8_t *shared_key = NULL; 1941 CBS ecpoint; 1942 int ret = -1; 1943 1944 if (!CBS_get_u8_length_prefixed(cbs, &ecpoint)) 1945 goto err; 1946 if (CBS_len(cbs) != 0) 1947 goto err; 1948 if (CBS_len(&ecpoint) != X25519_KEY_LENGTH) 1949 goto err; 1950 1951 if ((shared_key = malloc(X25519_KEY_LENGTH)) == NULL) 1952 goto err; 1953 if (!X25519(shared_key, S3I(s)->tmp.x25519, CBS_data(&ecpoint))) 1954 goto err; 1955 1956 freezero(S3I(s)->tmp.x25519, X25519_KEY_LENGTH); 1957 S3I(s)->tmp.x25519 = NULL; 1958 1959 s->session->master_key_length = 1960 tls1_generate_master_secret( 1961 s, s->session->master_key, shared_key, X25519_KEY_LENGTH); 1962 1963 ret = 1; 1964 1965 err: 1966 freezero(shared_key, X25519_KEY_LENGTH); 1967 1968 return (ret); 1969 } 1970 1971 static int 1972 ssl3_get_client_kex_ecdhe(SSL *s, CBS *cbs) 1973 { 1974 if (S3I(s)->tmp.x25519 != NULL) 1975 return ssl3_get_client_kex_ecdhe_ecx(s, cbs); 1976 1977 return ssl3_get_client_kex_ecdhe_ecp(s, cbs); 1978 } 1979 1980 static int 1981 ssl3_get_client_kex_gost(SSL *s, CBS *cbs) 1982 { 1983 EVP_PKEY_CTX *pkey_ctx; 1984 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL; 1985 unsigned char premaster_secret[32]; 1986 unsigned long alg_a; 1987 size_t outlen = 32; 1988 CBS gostblob; 1989 int al; 1990 int ret = 0; 1991 1992 /* Get our certificate private key*/ 1993 alg_a = S3I(s)->hs.new_cipher->algorithm_auth; 1994 if (alg_a & SSL_aGOST01) 1995 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey; 1996 1997 if ((pkey_ctx = EVP_PKEY_CTX_new(pk, NULL)) == NULL) 1998 goto err; 1999 if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) 2000 goto gerr; 2001 2002 /* 2003 * If client certificate is present and is of the same type, 2004 * maybe use it for key exchange. 2005 * Don't mind errors from EVP_PKEY_derive_set_peer, because 2006 * it is completely valid to use a client certificate for 2007 * authorization only. 2008 */ 2009 if ((client_pub_pkey = X509_get_pubkey(s->session->peer)) != NULL) { 2010 if (EVP_PKEY_derive_set_peer(pkey_ctx, 2011 client_pub_pkey) <= 0) 2012 ERR_clear_error(); 2013 } 2014 2015 /* Decrypt session key */ 2016 if (!CBS_get_asn1(cbs, &gostblob, CBS_ASN1_SEQUENCE)) 2017 goto truncated; 2018 if (CBS_len(cbs) != 0) 2019 goto truncated; 2020 if (EVP_PKEY_decrypt(pkey_ctx, premaster_secret, &outlen, 2021 CBS_data(&gostblob), CBS_len(&gostblob)) <= 0) { 2022 SSLerror(s, SSL_R_DECRYPTION_FAILED); 2023 goto gerr; 2024 } 2025 2026 /* Generate master secret */ 2027 s->session->master_key_length = 2028 tls1_generate_master_secret( 2029 s, s->session->master_key, premaster_secret, 32); 2030 2031 /* Check if pubkey from client certificate was used */ 2032 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, 2033 EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0) 2034 ret = 2; 2035 else 2036 ret = 1; 2037 gerr: 2038 EVP_PKEY_free(client_pub_pkey); 2039 EVP_PKEY_CTX_free(pkey_ctx); 2040 if (ret) 2041 return (ret); 2042 else 2043 goto err; 2044 2045 truncated: 2046 al = SSL_AD_DECODE_ERROR; 2047 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2048 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2049 err: 2050 return (-1); 2051 } 2052 2053 int 2054 ssl3_get_client_key_exchange(SSL *s) 2055 { 2056 unsigned long alg_k; 2057 int al, ok; 2058 CBS cbs; 2059 long n; 2060 2061 /* 2048 maxlen is a guess. How long a key does that permit? */ 2062 n = ssl3_get_message(s, SSL3_ST_SR_KEY_EXCH_A, 2063 SSL3_ST_SR_KEY_EXCH_B, SSL3_MT_CLIENT_KEY_EXCHANGE, 2048, &ok); 2064 if (!ok) 2065 return ((int)n); 2066 2067 if (n < 0) 2068 goto err; 2069 2070 CBS_init(&cbs, s->internal->init_msg, n); 2071 2072 alg_k = S3I(s)->hs.new_cipher->algorithm_mkey; 2073 2074 if (alg_k & SSL_kRSA) { 2075 if (ssl3_get_client_kex_rsa(s, &cbs) != 1) 2076 goto err; 2077 } else if (alg_k & SSL_kDHE) { 2078 if (ssl3_get_client_kex_dhe(s, &cbs) != 1) 2079 goto err; 2080 } else if (alg_k & SSL_kECDHE) { 2081 if (ssl3_get_client_kex_ecdhe(s, &cbs) != 1) 2082 goto err; 2083 } else if (alg_k & SSL_kGOST) { 2084 if (ssl3_get_client_kex_gost(s, &cbs) != 1) 2085 goto err; 2086 } else { 2087 al = SSL_AD_HANDSHAKE_FAILURE; 2088 SSLerror(s, SSL_R_UNKNOWN_CIPHER_TYPE); 2089 goto f_err; 2090 } 2091 2092 if (CBS_len(&cbs) != 0) { 2093 al = SSL_AD_DECODE_ERROR; 2094 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2095 goto f_err; 2096 } 2097 2098 return (1); 2099 2100 f_err: 2101 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2102 err: 2103 return (-1); 2104 } 2105 2106 int 2107 ssl3_get_cert_verify(SSL *s) 2108 { 2109 CBS cbs, signature; 2110 const struct ssl_sigalg *sigalg = NULL; 2111 const EVP_MD *md = NULL; 2112 EVP_PKEY *pkey = NULL; 2113 X509 *peer = NULL; 2114 EVP_MD_CTX mctx; 2115 int al, ok, verify; 2116 const unsigned char *hdata; 2117 size_t hdatalen; 2118 int type = 0; 2119 int ret = 0; 2120 long n; 2121 2122 EVP_MD_CTX_init(&mctx); 2123 2124 n = ssl3_get_message(s, SSL3_ST_SR_CERT_VRFY_A, 2125 SSL3_ST_SR_CERT_VRFY_B, -1, SSL3_RT_MAX_PLAIN_LENGTH, &ok); 2126 if (!ok) 2127 return ((int)n); 2128 2129 if (n < 0) 2130 goto err; 2131 2132 CBS_init(&cbs, s->internal->init_msg, n); 2133 2134 if (s->session->peer != NULL) { 2135 peer = s->session->peer; 2136 pkey = X509_get_pubkey(peer); 2137 type = X509_certificate_type(peer, pkey); 2138 } 2139 2140 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY) { 2141 S3I(s)->tmp.reuse_message = 1; 2142 if (peer != NULL) { 2143 al = SSL_AD_UNEXPECTED_MESSAGE; 2144 SSLerror(s, SSL_R_MISSING_VERIFY_MESSAGE); 2145 goto f_err; 2146 } 2147 ret = 1; 2148 goto end; 2149 } 2150 2151 if (peer == NULL) { 2152 SSLerror(s, SSL_R_NO_CLIENT_CERT_RECEIVED); 2153 al = SSL_AD_UNEXPECTED_MESSAGE; 2154 goto f_err; 2155 } 2156 2157 if (!(type & EVP_PKT_SIGN)) { 2158 SSLerror(s, SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE); 2159 al = SSL_AD_ILLEGAL_PARAMETER; 2160 goto f_err; 2161 } 2162 2163 if (S3I(s)->change_cipher_spec) { 2164 SSLerror(s, SSL_R_CCS_RECEIVED_EARLY); 2165 al = SSL_AD_UNEXPECTED_MESSAGE; 2166 goto f_err; 2167 } 2168 2169 if (!SSL_USE_SIGALGS(s)) { 2170 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2171 goto err; 2172 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2173 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2174 al = SSL_AD_DECODE_ERROR; 2175 goto f_err; 2176 } 2177 if (CBS_len(&cbs) != 0) { 2178 al = SSL_AD_DECODE_ERROR; 2179 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2180 goto f_err; 2181 } 2182 } 2183 2184 if (SSL_USE_SIGALGS(s)) { 2185 EVP_PKEY_CTX *pctx; 2186 uint16_t sigalg_value; 2187 2188 if (!CBS_get_u16(&cbs, &sigalg_value)) 2189 goto truncated; 2190 if ((sigalg = ssl_sigalg(sigalg_value, tls12_sigalgs, 2191 tls12_sigalgs_len)) == NULL || 2192 (md = sigalg->md()) == NULL) { 2193 SSLerror(s, SSL_R_UNKNOWN_DIGEST); 2194 al = SSL_AD_DECODE_ERROR; 2195 goto f_err; 2196 } 2197 if (!ssl_sigalg_pkey_ok(sigalg, pkey, 0)) { 2198 SSLerror(s, SSL_R_WRONG_SIGNATURE_TYPE); 2199 al = SSL_AD_DECODE_ERROR; 2200 goto f_err; 2201 } 2202 2203 if (!CBS_get_u16_length_prefixed(&cbs, &signature)) 2204 goto err; 2205 if (CBS_len(&signature) > EVP_PKEY_size(pkey)) { 2206 SSLerror(s, SSL_R_WRONG_SIGNATURE_SIZE); 2207 al = SSL_AD_DECODE_ERROR; 2208 goto f_err; 2209 } 2210 if (CBS_len(&cbs) != 0) { 2211 al = SSL_AD_DECODE_ERROR; 2212 SSLerror(s, SSL_R_EXTRA_DATA_IN_MESSAGE); 2213 goto f_err; 2214 } 2215 2216 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2217 SSLerror(s, ERR_R_INTERNAL_ERROR); 2218 al = SSL_AD_INTERNAL_ERROR; 2219 goto f_err; 2220 } 2221 if (!EVP_DigestVerifyInit(&mctx, &pctx, md, NULL, pkey)) { 2222 SSLerror(s, ERR_R_EVP_LIB); 2223 al = SSL_AD_INTERNAL_ERROR; 2224 goto f_err; 2225 } 2226 if ((sigalg->flags & SIGALG_FLAG_RSA_PSS) && 2227 (!EVP_PKEY_CTX_set_rsa_padding 2228 (pctx, RSA_PKCS1_PSS_PADDING) || 2229 !EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx, -1))) { 2230 al = SSL_AD_INTERNAL_ERROR; 2231 goto f_err; 2232 } 2233 if (sigalg->key_type == EVP_PKEY_GOSTR01 && 2234 EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2235 EVP_PKEY_CTRL_GOST_SIG_FORMAT, GOST_SIG_FORMAT_RS_LE, 2236 NULL) <= 0) { 2237 al = SSL_AD_INTERNAL_ERROR; 2238 goto f_err; 2239 } 2240 if (!EVP_DigestVerifyUpdate(&mctx, hdata, hdatalen)) { 2241 SSLerror(s, ERR_R_EVP_LIB); 2242 al = SSL_AD_INTERNAL_ERROR; 2243 goto f_err; 2244 } 2245 if (EVP_DigestVerifyFinal(&mctx, CBS_data(&signature), 2246 CBS_len(&signature)) <= 0) { 2247 al = SSL_AD_DECRYPT_ERROR; 2248 SSLerror(s, SSL_R_BAD_SIGNATURE); 2249 goto f_err; 2250 } 2251 } else if (pkey->type == EVP_PKEY_RSA) { 2252 verify = RSA_verify(NID_md5_sha1, S3I(s)->tmp.cert_verify_md, 2253 MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH, CBS_data(&signature), 2254 CBS_len(&signature), pkey->pkey.rsa); 2255 if (verify < 0) { 2256 al = SSL_AD_DECRYPT_ERROR; 2257 SSLerror(s, SSL_R_BAD_RSA_DECRYPT); 2258 goto f_err; 2259 } 2260 if (verify == 0) { 2261 al = SSL_AD_DECRYPT_ERROR; 2262 SSLerror(s, SSL_R_BAD_RSA_SIGNATURE); 2263 goto f_err; 2264 } 2265 } else if (pkey->type == EVP_PKEY_EC) { 2266 verify = ECDSA_verify(pkey->save_type, 2267 &(S3I(s)->tmp.cert_verify_md[MD5_DIGEST_LENGTH]), 2268 SHA_DIGEST_LENGTH, CBS_data(&signature), 2269 CBS_len(&signature), pkey->pkey.ec); 2270 if (verify <= 0) { 2271 al = SSL_AD_DECRYPT_ERROR; 2272 SSLerror(s, SSL_R_BAD_ECDSA_SIGNATURE); 2273 goto f_err; 2274 } 2275 #ifndef OPENSSL_NO_GOST 2276 } else if (pkey->type == NID_id_GostR3410_94 || 2277 pkey->type == NID_id_GostR3410_2001) { 2278 unsigned char sigbuf[128]; 2279 unsigned int siglen = sizeof(sigbuf); 2280 EVP_PKEY_CTX *pctx; 2281 int nid; 2282 2283 if (!tls1_transcript_data(s, &hdata, &hdatalen)) { 2284 SSLerror(s, ERR_R_INTERNAL_ERROR); 2285 al = SSL_AD_INTERNAL_ERROR; 2286 goto f_err; 2287 } 2288 if (!EVP_PKEY_get_default_digest_nid(pkey, &nid) || 2289 !(md = EVP_get_digestbynid(nid))) { 2290 SSLerror(s, ERR_R_EVP_LIB); 2291 al = SSL_AD_INTERNAL_ERROR; 2292 goto f_err; 2293 } 2294 if ((pctx = EVP_PKEY_CTX_new(pkey, NULL)) == NULL) { 2295 SSLerror(s, ERR_R_EVP_LIB); 2296 al = SSL_AD_INTERNAL_ERROR; 2297 goto f_err; 2298 } 2299 if (!EVP_DigestInit_ex(&mctx, md, NULL) || 2300 !EVP_DigestUpdate(&mctx, hdata, hdatalen) || 2301 !EVP_DigestFinal(&mctx, sigbuf, &siglen) || 2302 (EVP_PKEY_verify_init(pctx) <= 0) || 2303 (EVP_PKEY_CTX_set_signature_md(pctx, md) <= 0) || 2304 (EVP_PKEY_CTX_ctrl(pctx, -1, EVP_PKEY_OP_VERIFY, 2305 EVP_PKEY_CTRL_GOST_SIG_FORMAT, 2306 GOST_SIG_FORMAT_RS_LE, NULL) <= 0)) { 2307 SSLerror(s, ERR_R_EVP_LIB); 2308 al = SSL_AD_INTERNAL_ERROR; 2309 EVP_PKEY_CTX_free(pctx); 2310 goto f_err; 2311 } 2312 if (EVP_PKEY_verify(pctx, CBS_data(&signature), 2313 CBS_len(&signature), sigbuf, siglen) <= 0) { 2314 al = SSL_AD_DECRYPT_ERROR; 2315 SSLerror(s, SSL_R_BAD_SIGNATURE); 2316 EVP_PKEY_CTX_free(pctx); 2317 goto f_err; 2318 } 2319 2320 EVP_PKEY_CTX_free(pctx); 2321 #endif 2322 } else { 2323 SSLerror(s, ERR_R_INTERNAL_ERROR); 2324 al = SSL_AD_UNSUPPORTED_CERTIFICATE; 2325 goto f_err; 2326 } 2327 2328 ret = 1; 2329 if (0) { 2330 truncated: 2331 al = SSL_AD_DECODE_ERROR; 2332 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2333 f_err: 2334 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2335 } 2336 end: 2337 tls1_transcript_free(s); 2338 err: 2339 EVP_MD_CTX_cleanup(&mctx); 2340 EVP_PKEY_free(pkey); 2341 return (ret); 2342 } 2343 2344 int 2345 ssl3_get_client_certificate(SSL *s) 2346 { 2347 CBS cbs, client_certs; 2348 int i, ok, al, ret = -1; 2349 X509 *x = NULL; 2350 long n; 2351 const unsigned char *q; 2352 STACK_OF(X509) *sk = NULL; 2353 2354 n = ssl3_get_message(s, SSL3_ST_SR_CERT_A, SSL3_ST_SR_CERT_B, 2355 -1, s->internal->max_cert_list, &ok); 2356 if (!ok) 2357 return ((int)n); 2358 2359 if (S3I(s)->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE) { 2360 if ((s->verify_mode & SSL_VERIFY_PEER) && 2361 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2362 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2363 al = SSL_AD_HANDSHAKE_FAILURE; 2364 goto f_err; 2365 } 2366 /* 2367 * If tls asked for a client cert, 2368 * the client must return a 0 list. 2369 */ 2370 if (S3I(s)->tmp.cert_request) { 2371 SSLerror(s, SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST 2372 ); 2373 al = SSL_AD_UNEXPECTED_MESSAGE; 2374 goto f_err; 2375 } 2376 S3I(s)->tmp.reuse_message = 1; 2377 return (1); 2378 } 2379 2380 if (S3I(s)->tmp.message_type != SSL3_MT_CERTIFICATE) { 2381 al = SSL_AD_UNEXPECTED_MESSAGE; 2382 SSLerror(s, SSL_R_WRONG_MESSAGE_TYPE); 2383 goto f_err; 2384 } 2385 2386 if (n < 0) 2387 goto truncated; 2388 2389 CBS_init(&cbs, s->internal->init_msg, n); 2390 2391 if ((sk = sk_X509_new_null()) == NULL) { 2392 SSLerror(s, ERR_R_MALLOC_FAILURE); 2393 goto err; 2394 } 2395 2396 if (!CBS_get_u24_length_prefixed(&cbs, &client_certs) || 2397 CBS_len(&cbs) != 0) 2398 goto truncated; 2399 2400 while (CBS_len(&client_certs) > 0) { 2401 CBS cert; 2402 2403 if (!CBS_get_u24_length_prefixed(&client_certs, &cert)) { 2404 al = SSL_AD_DECODE_ERROR; 2405 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2406 goto f_err; 2407 } 2408 2409 q = CBS_data(&cert); 2410 x = d2i_X509(NULL, &q, CBS_len(&cert)); 2411 if (x == NULL) { 2412 SSLerror(s, ERR_R_ASN1_LIB); 2413 goto err; 2414 } 2415 if (q != CBS_data(&cert) + CBS_len(&cert)) { 2416 al = SSL_AD_DECODE_ERROR; 2417 SSLerror(s, SSL_R_CERT_LENGTH_MISMATCH); 2418 goto f_err; 2419 } 2420 if (!sk_X509_push(sk, x)) { 2421 SSLerror(s, ERR_R_MALLOC_FAILURE); 2422 goto err; 2423 } 2424 x = NULL; 2425 } 2426 2427 if (sk_X509_num(sk) <= 0) { 2428 /* 2429 * TLS does not mind 0 certs returned. 2430 * Fail for TLS only if we required a certificate. 2431 */ 2432 if ((s->verify_mode & SSL_VERIFY_PEER) && 2433 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) { 2434 SSLerror(s, SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE); 2435 al = SSL_AD_HANDSHAKE_FAILURE; 2436 goto f_err; 2437 } 2438 /* No client certificate so free transcript. */ 2439 tls1_transcript_free(s); 2440 } else { 2441 i = ssl_verify_cert_chain(s, sk); 2442 if (i <= 0) { 2443 al = ssl_verify_alarm_type(s->verify_result); 2444 SSLerror(s, SSL_R_NO_CERTIFICATE_RETURNED); 2445 goto f_err; 2446 } 2447 } 2448 2449 X509_free(s->session->peer); 2450 s->session->peer = sk_X509_shift(sk); 2451 s->session->verify_result = s->verify_result; 2452 2453 /* 2454 * With the current implementation, sess_cert will always be NULL 2455 * when we arrive here 2456 */ 2457 if (SSI(s)->sess_cert == NULL) { 2458 SSI(s)->sess_cert = ssl_sess_cert_new(); 2459 if (SSI(s)->sess_cert == NULL) { 2460 SSLerror(s, ERR_R_MALLOC_FAILURE); 2461 goto err; 2462 } 2463 } 2464 sk_X509_pop_free(SSI(s)->sess_cert->cert_chain, X509_free); 2465 SSI(s)->sess_cert->cert_chain = sk; 2466 2467 /* 2468 * Inconsistency alert: cert_chain does *not* include the 2469 * peer's own certificate, while we do include it in s3_clnt.c 2470 */ 2471 2472 sk = NULL; 2473 2474 ret = 1; 2475 if (0) { 2476 truncated: 2477 al = SSL_AD_DECODE_ERROR; 2478 SSLerror(s, SSL_R_BAD_PACKET_LENGTH); 2479 f_err: 2480 ssl3_send_alert(s, SSL3_AL_FATAL, al); 2481 } 2482 err: 2483 X509_free(x); 2484 sk_X509_pop_free(sk, X509_free); 2485 2486 return (ret); 2487 } 2488 2489 int 2490 ssl3_send_server_certificate(SSL *s) 2491 { 2492 CBB cbb, server_cert; 2493 CERT_PKEY *cpk; 2494 2495 /* 2496 * Server Certificate - RFC 5246, section 7.4.2. 2497 */ 2498 2499 memset(&cbb, 0, sizeof(cbb)); 2500 2501 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_A) { 2502 if ((cpk = ssl_get_server_send_pkey(s)) == NULL) { 2503 SSLerror(s, ERR_R_INTERNAL_ERROR); 2504 return (0); 2505 } 2506 2507 if (!ssl3_handshake_msg_start(s, &cbb, &server_cert, 2508 SSL3_MT_CERTIFICATE)) 2509 goto err; 2510 if (!ssl3_output_cert_chain(s, &server_cert, cpk)) 2511 goto err; 2512 if (!ssl3_handshake_msg_finish(s, &cbb)) 2513 goto err; 2514 2515 S3I(s)->hs.state = SSL3_ST_SW_CERT_B; 2516 } 2517 2518 /* SSL3_ST_SW_CERT_B */ 2519 return (ssl3_handshake_write(s)); 2520 2521 err: 2522 CBB_cleanup(&cbb); 2523 2524 return (0); 2525 } 2526 2527 /* send a new session ticket (not necessarily for a new session) */ 2528 int 2529 ssl3_send_newsession_ticket(SSL *s) 2530 { 2531 CBB cbb, session_ticket, ticket; 2532 SSL_CTX *tctx = s->initial_ctx; 2533 size_t enc_session_len, enc_session_max_len, hmac_len; 2534 size_t session_len = 0; 2535 unsigned char *enc_session = NULL, *session = NULL; 2536 unsigned char iv[EVP_MAX_IV_LENGTH]; 2537 unsigned char key_name[16]; 2538 unsigned char *hmac; 2539 unsigned int hlen; 2540 EVP_CIPHER_CTX ctx; 2541 HMAC_CTX hctx; 2542 int len; 2543 2544 /* 2545 * New Session Ticket - RFC 5077, section 3.3. 2546 */ 2547 2548 EVP_CIPHER_CTX_init(&ctx); 2549 HMAC_CTX_init(&hctx); 2550 2551 memset(&cbb, 0, sizeof(cbb)); 2552 2553 if (S3I(s)->hs.state == SSL3_ST_SW_SESSION_TICKET_A) { 2554 if (!ssl3_handshake_msg_start(s, &cbb, &session_ticket, 2555 SSL3_MT_NEWSESSION_TICKET)) 2556 goto err; 2557 2558 if (!SSL_SESSION_ticket(s->session, &session, &session_len)) 2559 goto err; 2560 if (session_len > 0xffff) 2561 goto err; 2562 2563 /* 2564 * Initialize HMAC and cipher contexts. If callback is present 2565 * it does all the work, otherwise use generated values from 2566 * parent context. 2567 */ 2568 if (tctx->internal->tlsext_ticket_key_cb != NULL) { 2569 if (tctx->internal->tlsext_ticket_key_cb(s, 2570 key_name, iv, &ctx, &hctx, 1) < 0) { 2571 EVP_CIPHER_CTX_cleanup(&ctx); 2572 goto err; 2573 } 2574 } else { 2575 arc4random_buf(iv, 16); 2576 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 2577 tctx->internal->tlsext_tick_aes_key, iv); 2578 HMAC_Init_ex(&hctx, tctx->internal->tlsext_tick_hmac_key, 2579 16, EVP_sha256(), NULL); 2580 memcpy(key_name, tctx->internal->tlsext_tick_key_name, 16); 2581 } 2582 2583 /* Encrypt the session state. */ 2584 enc_session_max_len = session_len + EVP_MAX_BLOCK_LENGTH; 2585 if ((enc_session = calloc(1, enc_session_max_len)) == NULL) 2586 goto err; 2587 enc_session_len = 0; 2588 if (!EVP_EncryptUpdate(&ctx, enc_session, &len, session, 2589 session_len)) 2590 goto err; 2591 enc_session_len += len; 2592 if (!EVP_EncryptFinal_ex(&ctx, enc_session + enc_session_len, 2593 &len)) 2594 goto err; 2595 enc_session_len += len; 2596 2597 if (enc_session_len > enc_session_max_len) 2598 goto err; 2599 2600 /* Generate the HMAC. */ 2601 if (!HMAC_Update(&hctx, key_name, sizeof(key_name))) 2602 goto err; 2603 if (!HMAC_Update(&hctx, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2604 goto err; 2605 if (!HMAC_Update(&hctx, enc_session, enc_session_len)) 2606 goto err; 2607 2608 if ((hmac_len = HMAC_size(&hctx)) <= 0) 2609 goto err; 2610 2611 /* 2612 * Ticket lifetime hint (advisory only): 2613 * We leave this unspecified for resumed session 2614 * (for simplicity), and guess that tickets for new 2615 * sessions will live as long as their sessions. 2616 */ 2617 if (!CBB_add_u32(&session_ticket, 2618 s->internal->hit ? 0 : s->session->timeout)) 2619 goto err; 2620 2621 if (!CBB_add_u16_length_prefixed(&session_ticket, &ticket)) 2622 goto err; 2623 if (!CBB_add_bytes(&ticket, key_name, sizeof(key_name))) 2624 goto err; 2625 if (!CBB_add_bytes(&ticket, iv, EVP_CIPHER_CTX_iv_length(&ctx))) 2626 goto err; 2627 if (!CBB_add_bytes(&ticket, enc_session, enc_session_len)) 2628 goto err; 2629 if (!CBB_add_space(&ticket, &hmac, hmac_len)) 2630 goto err; 2631 2632 if (!HMAC_Final(&hctx, hmac, &hlen)) 2633 goto err; 2634 if (hlen != hmac_len) 2635 goto err; 2636 2637 if (!ssl3_handshake_msg_finish(s, &cbb)) 2638 goto err; 2639 2640 S3I(s)->hs.state = SSL3_ST_SW_SESSION_TICKET_B; 2641 } 2642 2643 EVP_CIPHER_CTX_cleanup(&ctx); 2644 HMAC_CTX_cleanup(&hctx); 2645 freezero(session, session_len); 2646 free(enc_session); 2647 2648 /* SSL3_ST_SW_SESSION_TICKET_B */ 2649 return (ssl3_handshake_write(s)); 2650 2651 err: 2652 CBB_cleanup(&cbb); 2653 EVP_CIPHER_CTX_cleanup(&ctx); 2654 HMAC_CTX_cleanup(&hctx); 2655 freezero(session, session_len); 2656 free(enc_session); 2657 2658 return (-1); 2659 } 2660 2661 int 2662 ssl3_send_cert_status(SSL *s) 2663 { 2664 CBB cbb, certstatus, ocspresp; 2665 2666 memset(&cbb, 0, sizeof(cbb)); 2667 2668 if (S3I(s)->hs.state == SSL3_ST_SW_CERT_STATUS_A) { 2669 if (!ssl3_handshake_msg_start(s, &cbb, &certstatus, 2670 SSL3_MT_CERTIFICATE_STATUS)) 2671 goto err; 2672 if (!CBB_add_u8(&certstatus, s->tlsext_status_type)) 2673 goto err; 2674 if (!CBB_add_u24_length_prefixed(&certstatus, &ocspresp)) 2675 goto err; 2676 if (!CBB_add_bytes(&ocspresp, s->internal->tlsext_ocsp_resp, 2677 s->internal->tlsext_ocsp_resp_len)) 2678 goto err; 2679 if (!ssl3_handshake_msg_finish(s, &cbb)) 2680 goto err; 2681 2682 S3I(s)->hs.state = SSL3_ST_SW_CERT_STATUS_B; 2683 } 2684 2685 /* SSL3_ST_SW_CERT_STATUS_B */ 2686 return (ssl3_handshake_write(s)); 2687 2688 err: 2689 CBB_cleanup(&cbb); 2690 2691 return (-1); 2692 } 2693