d1_srvr.c revision 296465
1/* ssl/d1_srvr.c */ 2/* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005. 5 */ 6/* ==================================================================== 7 * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. All advertising materials mentioning features or use of this 22 * software must display the following acknowledgment: 23 * "This product includes software developed by the OpenSSL Project 24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 25 * 26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27 * endorse or promote products derived from this software without 28 * prior written permission. For written permission, please contact 29 * openssl-core@OpenSSL.org. 30 * 31 * 5. Products derived from this software may not be called "OpenSSL" 32 * nor may "OpenSSL" appear in their names without prior written 33 * permission of the OpenSSL Project. 34 * 35 * 6. Redistributions of any form whatsoever must retain the following 36 * acknowledgment: 37 * "This product includes software developed by the OpenSSL Project 38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51 * OF THE POSSIBILITY OF SUCH DAMAGE. 52 * ==================================================================== 53 * 54 * This product includes cryptographic software written by Eric Young 55 * (eay@cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh@cryptsoft.com). 57 * 58 */ 59/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay@cryptsoft.com). 64 * The implementation was written so as to conform with Netscapes SSL. 65 * 66 * This library is free for commercial and non-commercial use as long as 67 * the following conditions are aheared to. The following conditions 68 * apply to all code found in this distribution, be it the RC4, RSA, 69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 70 * included with this distribution is covered by the same copyright terms 71 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 72 * 73 * Copyright remains Eric Young's, and as such any Copyright notices in 74 * the code are not to be removed. 75 * If this package is used in a product, Eric Young should be given attribution 76 * as the author of the parts of the library used. 77 * This can be in the form of a textual message at program startup or 78 * in documentation (online or textual) provided with the package. 79 * 80 * Redistribution and use in source and binary forms, with or without 81 * modification, are permitted provided that the following conditions 82 * are met: 83 * 1. Redistributions of source code must retain the copyright 84 * notice, this list of conditions and the following disclaimer. 85 * 2. Redistributions in binary form must reproduce the above copyright 86 * notice, this list of conditions and the following disclaimer in the 87 * documentation and/or other materials provided with the distribution. 88 * 3. All advertising materials mentioning features or use of this software 89 * must display the following acknowledgement: 90 * "This product includes cryptographic software written by 91 * Eric Young (eay@cryptsoft.com)" 92 * The word 'cryptographic' can be left out if the rouines from the library 93 * being used are not cryptographic related :-). 94 * 4. If you include any Windows specific code (or a derivative thereof) from 95 * the apps directory (application code) you must include an acknowledgement: 96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 97 * 98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 108 * SUCH DAMAGE. 109 * 110 * The licence and distribution terms for any publically available version or 111 * derivative of this code cannot be changed. i.e. this code cannot simply be 112 * copied and put under another distribution licence 113 * [including the GNU Public Licence.] 114 */ 115 116#include <stdio.h> 117#include "ssl_locl.h" 118#include <openssl/buffer.h> 119#include <openssl/rand.h> 120#include <openssl/objects.h> 121#include <openssl/evp.h> 122#include <openssl/x509.h> 123#include <openssl/md5.h> 124#ifndef OPENSSL_NO_DH 125# include <openssl/dh.h> 126#endif 127 128static SSL_METHOD *dtls1_get_server_method(int ver); 129static int dtls1_send_hello_verify_request(SSL *s); 130 131static SSL_METHOD *dtls1_get_server_method(int ver) 132{ 133 if (ver == DTLS1_VERSION) 134 return (DTLSv1_server_method()); 135 else 136 return (NULL); 137} 138 139IMPLEMENT_dtls1_meth_func(DTLSv1_server_method, 140 dtls1_accept, 141 ssl_undefined_function, dtls1_get_server_method) 142 143int dtls1_accept(SSL *s) 144{ 145 BUF_MEM *buf; 146 unsigned long l, Time = (unsigned long)time(NULL); 147 void (*cb) (const SSL *ssl, int type, int val) = NULL; 148 int ret = -1; 149 int new_state, state, skip = 0; 150 int listen; 151 152 RAND_add(&Time, sizeof(Time), 0); 153 ERR_clear_error(); 154 clear_sys_error(); 155 156 if (s->info_callback != NULL) 157 cb = s->info_callback; 158 else if (s->ctx->info_callback != NULL) 159 cb = s->ctx->info_callback; 160 161 listen = s->d1->listen; 162 163 /* init things to blank */ 164 s->in_handshake++; 165 if (!SSL_in_init(s) || SSL_in_before(s)) 166 SSL_clear(s); 167 168 s->d1->listen = listen; 169 170 if (s->cert == NULL) { 171 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET); 172 return (-1); 173 } 174 175 for (;;) { 176 state = s->state; 177 178 switch (s->state) { 179 case SSL_ST_RENEGOTIATE: 180 s->new_session = 1; 181 /* s->state=SSL_ST_ACCEPT; */ 182 183 case SSL_ST_BEFORE: 184 case SSL_ST_ACCEPT: 185 case SSL_ST_BEFORE | SSL_ST_ACCEPT: 186 case SSL_ST_OK | SSL_ST_ACCEPT: 187 188 s->server = 1; 189 if (cb != NULL) 190 cb(s, SSL_CB_HANDSHAKE_START, 1); 191 192 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { 193 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 194 return -1; 195 } 196 s->type = SSL_ST_ACCEPT; 197 198 if (s->init_buf == NULL) { 199 if ((buf = BUF_MEM_new()) == NULL) { 200 ret = -1; 201 goto end; 202 } 203 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 204 ret = -1; 205 goto end; 206 } 207 s->init_buf = buf; 208 } 209 210 if (!ssl3_setup_buffers(s)) { 211 ret = -1; 212 goto end; 213 } 214 215 s->init_num = 0; 216 217 if (s->state != SSL_ST_RENEGOTIATE) { 218 /* 219 * Ok, we now need to push on a buffering BIO so that the 220 * output is sent in a way that TCP likes :-) 221 */ 222 if (!ssl_init_wbio_buffer(s, 1)) { 223 ret = -1; 224 goto end; 225 } 226 227 ssl3_init_finished_mac(s); 228 s->state = SSL3_ST_SR_CLNT_HELLO_A; 229 s->ctx->stats.sess_accept++; 230 } else { 231 /* 232 * s->state == SSL_ST_RENEGOTIATE, we will just send a 233 * HelloRequest 234 */ 235 s->ctx->stats.sess_accept_renegotiate++; 236 s->state = SSL3_ST_SW_HELLO_REQ_A; 237 } 238 239 break; 240 241 case SSL3_ST_SW_HELLO_REQ_A: 242 case SSL3_ST_SW_HELLO_REQ_B: 243 244 s->shutdown = 0; 245 dtls1_clear_record_buffer(s); 246 dtls1_start_timer(s); 247 ret = dtls1_send_hello_request(s); 248 if (ret <= 0) 249 goto end; 250 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 251 s->state = SSL3_ST_SW_FLUSH; 252 s->init_num = 0; 253 254 ssl3_init_finished_mac(s); 255 break; 256 257 case SSL3_ST_SW_HELLO_REQ_C: 258 s->state = SSL_ST_OK; 259 break; 260 261 case SSL3_ST_SR_CLNT_HELLO_A: 262 case SSL3_ST_SR_CLNT_HELLO_B: 263 case SSL3_ST_SR_CLNT_HELLO_C: 264 265 s->shutdown = 0; 266 ret = ssl3_get_client_hello(s); 267 if (ret <= 0) 268 goto end; 269 dtls1_stop_timer(s); 270 271 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 272 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 273 else 274 s->state = SSL3_ST_SW_SRVR_HELLO_A; 275 276 s->init_num = 0; 277 278 /* 279 * Reflect ClientHello sequence to remain stateless while 280 * listening 281 */ 282 if (listen) { 283 memcpy(s->s3->write_sequence, s->s3->read_sequence, 284 sizeof(s->s3->write_sequence)); 285 } 286 287 /* If we're just listening, stop here */ 288 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) { 289 ret = 2; 290 s->d1->listen = 0; 291 /* 292 * Set expected sequence numbers to continue the handshake. 293 */ 294 s->d1->handshake_read_seq = 2; 295 s->d1->handshake_write_seq = 1; 296 s->d1->next_handshake_write_seq = 1; 297 goto end; 298 } 299 300 break; 301 302 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 303 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 304 305 ret = dtls1_send_hello_verify_request(s); 306 if (ret <= 0) 307 goto end; 308 s->state = SSL3_ST_SW_FLUSH; 309 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 310 311 /* HelloVerifyRequests resets Finished MAC */ 312 if (s->client_version != DTLS1_BAD_VER) 313 ssl3_init_finished_mac(s); 314 break; 315 316 case SSL3_ST_SW_SRVR_HELLO_A: 317 case SSL3_ST_SW_SRVR_HELLO_B: 318 s->new_session = 2; 319 dtls1_start_timer(s); 320 ret = dtls1_send_server_hello(s); 321 if (ret <= 0) 322 goto end; 323 324#ifndef OPENSSL_NO_TLSEXT 325 if (s->hit) { 326 if (s->tlsext_ticket_expected) 327 s->state = SSL3_ST_SW_SESSION_TICKET_A; 328 else 329 s->state = SSL3_ST_SW_CHANGE_A; 330 } 331#else 332 if (s->hit) 333 s->state = SSL3_ST_SW_CHANGE_A; 334#endif 335 else 336 s->state = SSL3_ST_SW_CERT_A; 337 s->init_num = 0; 338 break; 339 340 case SSL3_ST_SW_CERT_A: 341 case SSL3_ST_SW_CERT_B: 342 /* Check if it is anon DH */ 343 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) { 344 dtls1_start_timer(s); 345 ret = dtls1_send_server_certificate(s); 346 if (ret <= 0) 347 goto end; 348#ifndef OPENSSL_NO_TLSEXT 349 if (s->tlsext_status_expected) 350 s->state = SSL3_ST_SW_CERT_STATUS_A; 351 else 352 s->state = SSL3_ST_SW_KEY_EXCH_A; 353 } else { 354 skip = 1; 355 s->state = SSL3_ST_SW_KEY_EXCH_A; 356 } 357#else 358 } else 359 skip = 1; 360 361 s->state = SSL3_ST_SW_KEY_EXCH_A; 362#endif 363 s->init_num = 0; 364 break; 365 366 case SSL3_ST_SW_KEY_EXCH_A: 367 case SSL3_ST_SW_KEY_EXCH_B: 368 l = s->s3->tmp.new_cipher->algorithms; 369 370 /* 371 * clear this, it may get reset by send_server_key_exchange 372 */ 373 s->s3->tmp.use_rsa_tmp = 0; 374 375 /* 376 * only send if a DH key exchange, fortezza or RSA but we have a 377 * sign only certificate 378 */ 379 if ((l & (SSL_DH | SSL_kFZA)) 380 || ((l & SSL_kRSA) 381 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 382 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 383 && EVP_PKEY_size(s->cert->pkeys 384 [SSL_PKEY_RSA_ENC].privatekey) * 385 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 386 ) 387 ) 388 ) 389 ) { 390 dtls1_start_timer(s); 391 ret = dtls1_send_server_key_exchange(s); 392 if (ret <= 0) 393 goto end; 394 } else 395 skip = 1; 396 397 s->state = SSL3_ST_SW_CERT_REQ_A; 398 s->init_num = 0; 399 break; 400 401 case SSL3_ST_SW_CERT_REQ_A: 402 case SSL3_ST_SW_CERT_REQ_B: 403 if ( /* don't request cert unless asked for it: */ 404 !(s->verify_mode & SSL_VERIFY_PEER) || 405 /* 406 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert 407 * during re-negotiation: 408 */ 409 ((s->session->peer != NULL) && 410 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 411 /* 412 * never request cert in anonymous ciphersuites (see 413 * section "Certificate request" in SSL 3 drafts and in 414 * RFC 2246): 415 */ 416 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) && 417 /* 418 * ... except when the application insists on 419 * verification (against the specs, but s3_clnt.c accepts 420 * this for SSL 3) 421 */ 422 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 423 /* 424 * never request cert in Kerberos ciphersuites 425 */ 426 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5)) { 427 /* no cert request */ 428 skip = 1; 429 s->s3->tmp.cert_request = 0; 430 s->state = SSL3_ST_SW_SRVR_DONE_A; 431 } else { 432 s->s3->tmp.cert_request = 1; 433 dtls1_start_timer(s); 434 ret = dtls1_send_certificate_request(s); 435 if (ret <= 0) 436 goto end; 437#ifndef NETSCAPE_HANG_BUG 438 s->state = SSL3_ST_SW_SRVR_DONE_A; 439#else 440 s->state = SSL3_ST_SW_FLUSH; 441 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 442#endif 443 s->init_num = 0; 444 } 445 break; 446 447 case SSL3_ST_SW_SRVR_DONE_A: 448 case SSL3_ST_SW_SRVR_DONE_B: 449 dtls1_start_timer(s); 450 ret = dtls1_send_server_done(s); 451 if (ret <= 0) 452 goto end; 453 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 454 s->state = SSL3_ST_SW_FLUSH; 455 s->init_num = 0; 456 break; 457 458 case SSL3_ST_SW_FLUSH: 459 s->rwstate = SSL_WRITING; 460 if (BIO_flush(s->wbio) <= 0) { 461 ret = -1; 462 goto end; 463 } 464 s->rwstate = SSL_NOTHING; 465 s->state = s->s3->tmp.next_state; 466 break; 467 468 case SSL3_ST_SR_CERT_A: 469 case SSL3_ST_SR_CERT_B: 470 /* Check for second client hello (MS SGC) */ 471 ret = ssl3_check_client_hello(s); 472 if (ret <= 0) 473 goto end; 474 if (ret == 2) { 475 dtls1_stop_timer(s); 476 s->state = SSL3_ST_SR_CLNT_HELLO_C; 477 } else { 478 if (s->s3->tmp.cert_request) { 479 ret = ssl3_get_client_certificate(s); 480 if (ret <= 0) 481 goto end; 482 } 483 s->init_num = 0; 484 s->state = SSL3_ST_SR_KEY_EXCH_A; 485 } 486 break; 487 488 case SSL3_ST_SR_KEY_EXCH_A: 489 case SSL3_ST_SR_KEY_EXCH_B: 490 ret = ssl3_get_client_key_exchange(s); 491 if (ret <= 0) 492 goto end; 493 s->state = SSL3_ST_SR_CERT_VRFY_A; 494 s->init_num = 0; 495 496 /* 497 * We need to get hashes here so if there is a client cert, it 498 * can be verified 499 */ 500 s->method->ssl3_enc->cert_verify_mac(s, 501 &(s->s3->finish_dgst1), 502 &(s->s3-> 503 tmp.cert_verify_md[0])); 504 s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst2), 505 &(s->s3-> 506 tmp.cert_verify_md 507 [MD5_DIGEST_LENGTH])); 508 509 break; 510 511 case SSL3_ST_SR_CERT_VRFY_A: 512 case SSL3_ST_SR_CERT_VRFY_B: 513 514 s->d1->change_cipher_spec_ok = 1; 515 /* we should decide if we expected this one */ 516 ret = ssl3_get_cert_verify(s); 517 if (ret <= 0) 518 goto end; 519 520 s->state = SSL3_ST_SR_FINISHED_A; 521 s->init_num = 0; 522 break; 523 524 case SSL3_ST_SR_FINISHED_A: 525 case SSL3_ST_SR_FINISHED_B: 526 s->d1->change_cipher_spec_ok = 1; 527 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 528 SSL3_ST_SR_FINISHED_B); 529 if (ret <= 0) 530 goto end; 531 dtls1_stop_timer(s); 532 if (s->hit) 533 s->state = SSL_ST_OK; 534#ifndef OPENSSL_NO_TLSEXT 535 else if (s->tlsext_ticket_expected) 536 s->state = SSL3_ST_SW_SESSION_TICKET_A; 537#endif 538 else 539 s->state = SSL3_ST_SW_CHANGE_A; 540 s->init_num = 0; 541 break; 542 543#ifndef OPENSSL_NO_TLSEXT 544 case SSL3_ST_SW_SESSION_TICKET_A: 545 case SSL3_ST_SW_SESSION_TICKET_B: 546 ret = dtls1_send_newsession_ticket(s); 547 if (ret <= 0) 548 goto end; 549 s->state = SSL3_ST_SW_CHANGE_A; 550 s->init_num = 0; 551 break; 552 553 case SSL3_ST_SW_CERT_STATUS_A: 554 case SSL3_ST_SW_CERT_STATUS_B: 555 ret = ssl3_send_cert_status(s); 556 if (ret <= 0) 557 goto end; 558 s->state = SSL3_ST_SW_KEY_EXCH_A; 559 s->init_num = 0; 560 break; 561 562#endif 563 564 case SSL3_ST_SW_CHANGE_A: 565 case SSL3_ST_SW_CHANGE_B: 566 567 s->session->cipher = s->s3->tmp.new_cipher; 568 if (!s->method->ssl3_enc->setup_key_block(s)) { 569 ret = -1; 570 goto end; 571 } 572 573 ret = dtls1_send_change_cipher_spec(s, 574 SSL3_ST_SW_CHANGE_A, 575 SSL3_ST_SW_CHANGE_B); 576 577 if (ret <= 0) 578 goto end; 579 s->state = SSL3_ST_SW_FINISHED_A; 580 s->init_num = 0; 581 582 if (!s->method->ssl3_enc->change_cipher_state(s, 583 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 584 { 585 ret = -1; 586 goto end; 587 } 588 589 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 590 break; 591 592 case SSL3_ST_SW_FINISHED_A: 593 case SSL3_ST_SW_FINISHED_B: 594 ret = dtls1_send_finished(s, 595 SSL3_ST_SW_FINISHED_A, 596 SSL3_ST_SW_FINISHED_B, 597 s->method-> 598 ssl3_enc->server_finished_label, 599 s->method-> 600 ssl3_enc->server_finished_label_len); 601 if (ret <= 0) 602 goto end; 603 s->state = SSL3_ST_SW_FLUSH; 604 if (s->hit) 605 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A; 606 else 607 s->s3->tmp.next_state = SSL_ST_OK; 608 s->init_num = 0; 609 break; 610 611 case SSL_ST_OK: 612 /* clean a few things up */ 613 ssl3_cleanup_key_block(s); 614 615#if 0 616 BUF_MEM_free(s->init_buf); 617 s->init_buf = NULL; 618#endif 619 620 /* remove buffering on output */ 621 ssl_free_wbio_buffer(s); 622 623 s->init_num = 0; 624 625 if (s->new_session == 2) { /* skipped if we just sent a 626 * HelloRequest */ 627 /* 628 * actually not necessarily a 'new' session unless 629 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set 630 */ 631 632 s->new_session = 0; 633 634 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 635 636 s->ctx->stats.sess_accept_good++; 637 /* s->server=1; */ 638 s->handshake_func = dtls1_accept; 639 640 if (cb != NULL) 641 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 642 } 643 644 ret = 1; 645 646 /* done handshaking, next message is client hello */ 647 s->d1->handshake_read_seq = 0; 648 /* next message is server hello */ 649 s->d1->handshake_write_seq = 0; 650 s->d1->next_handshake_write_seq = 0; 651 goto end; 652 /* break; */ 653 654 default: 655 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE); 656 ret = -1; 657 goto end; 658 /* break; */ 659 } 660 661 if (!s->s3->tmp.reuse_message && !skip) { 662 if (s->debug) { 663 if ((ret = BIO_flush(s->wbio)) <= 0) 664 goto end; 665 } 666 667 if ((cb != NULL) && (s->state != state)) { 668 new_state = s->state; 669 s->state = state; 670 cb(s, SSL_CB_ACCEPT_LOOP, 1); 671 s->state = new_state; 672 } 673 } 674 skip = 0; 675 } 676 end: 677 /* BIO_flush(s->wbio); */ 678 679 s->in_handshake--; 680 if (cb != NULL) 681 cb(s, SSL_CB_ACCEPT_EXIT, ret); 682 return (ret); 683} 684 685int dtls1_send_hello_request(SSL *s) 686{ 687 unsigned char *p; 688 689 if (s->state == SSL3_ST_SW_HELLO_REQ_A) { 690 p = (unsigned char *)s->init_buf->data; 691 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 692 693 s->state = SSL3_ST_SW_HELLO_REQ_B; 694 /* number of bytes to write */ 695 s->init_num = DTLS1_HM_HEADER_LENGTH; 696 s->init_off = 0; 697 698 /* 699 * no need to buffer this message, since there are no retransmit 700 * requests for it 701 */ 702 } 703 704 /* SSL3_ST_SW_HELLO_REQ_B */ 705 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 706} 707 708int dtls1_send_hello_verify_request(SSL *s) 709{ 710 unsigned int msg_len; 711 unsigned char *msg, *buf, *p; 712 713 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 714 buf = (unsigned char *)s->init_buf->data; 715 716 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 717 if (s->client_version == DTLS1_BAD_VER) 718 *(p++) = DTLS1_BAD_VER >> 8, *(p++) = DTLS1_BAD_VER & 0xff; 719 else 720 *(p++) = s->version >> 8, *(p++) = s->version & 0xFF; 721 722 if (s->ctx->app_gen_cookie_cb == NULL || 723 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 724 &(s->d1->cookie_len)) == 0) { 725 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST, 726 ERR_R_INTERNAL_ERROR); 727 return 0; 728 } 729 730 *(p++) = (unsigned char)s->d1->cookie_len; 731 memcpy(p, s->d1->cookie, s->d1->cookie_len); 732 p += s->d1->cookie_len; 733 msg_len = p - msg; 734 735 dtls1_set_message_header(s, buf, 736 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, 737 msg_len); 738 739 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 740 /* number of bytes to write */ 741 s->init_num = p - buf; 742 s->init_off = 0; 743 } 744 745 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 746 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 747} 748 749int dtls1_send_server_hello(SSL *s) 750{ 751 unsigned char *buf; 752 unsigned char *p, *d; 753 int i; 754 unsigned int sl; 755 unsigned long l, Time; 756 757 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) { 758 buf = (unsigned char *)s->init_buf->data; 759 p = s->s3->server_random; 760 Time = (unsigned long)time(NULL); /* Time */ 761 l2n(Time, p); 762 RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4); 763 /* Do the message type and length last */ 764 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 765 766 if (s->client_version == DTLS1_BAD_VER) 767 *(p++) = DTLS1_BAD_VER >> 8, *(p++) = DTLS1_BAD_VER & 0xff; 768 else 769 *(p++) = s->version >> 8, *(p++) = s->version & 0xff; 770 771 /* Random stuff */ 772 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); 773 p += SSL3_RANDOM_SIZE; 774 775 /* 776 * now in theory we have 3 options to sending back the session id. 777 * If it is a re-use, we send back the old session-id, if it is a new 778 * session, we send back the new session-id or we send back a 0 779 * length session-id if we want it to be single use. Currently I will 780 * not implement the '0' length session-id 12-Jan-98 - I'll now 781 * support the '0' length stuff. 782 */ 783 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 784 s->session->session_id_length = 0; 785 786 sl = s->session->session_id_length; 787 if (sl > sizeof s->session->session_id) { 788 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 789 return -1; 790 } 791 *(p++) = sl; 792 memcpy(p, s->session->session_id, sl); 793 p += sl; 794 795 /* put the cipher */ 796 if (s->s3->tmp.new_cipher == NULL) 797 return -1; 798 i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p); 799 p += i; 800 801 /* put the compression method */ 802#ifdef OPENSSL_NO_COMP 803 *(p++) = 0; 804#else 805 if (s->s3->tmp.new_compression == NULL) 806 *(p++) = 0; 807 else 808 *(p++) = s->s3->tmp.new_compression->id; 809#endif 810 811#ifndef OPENSSL_NO_TLSEXT 812 if ((p = 813 ssl_add_serverhello_tlsext(s, p, 814 buf + SSL3_RT_MAX_PLAIN_LENGTH)) == 815 NULL) { 816 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 817 return -1; 818 } 819#endif 820 821 /* do the header */ 822 l = (p - d); 823 d = buf; 824 825 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 826 827 s->state = SSL3_ST_SW_SRVR_HELLO_B; 828 /* number of bytes to write */ 829 s->init_num = p - buf; 830 s->init_off = 0; 831 832 /* buffer the message to handle re-xmits */ 833 dtls1_buffer_message(s, 0); 834 } 835 836 /* SSL3_ST_SW_SRVR_HELLO_B */ 837 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 838} 839 840int dtls1_send_server_done(SSL *s) 841{ 842 unsigned char *p; 843 844 if (s->state == SSL3_ST_SW_SRVR_DONE_A) { 845 p = (unsigned char *)s->init_buf->data; 846 847 /* do the header */ 848 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 849 850 s->state = SSL3_ST_SW_SRVR_DONE_B; 851 /* number of bytes to write */ 852 s->init_num = DTLS1_HM_HEADER_LENGTH; 853 s->init_off = 0; 854 855 /* buffer the message to handle re-xmits */ 856 dtls1_buffer_message(s, 0); 857 } 858 859 /* SSL3_ST_SW_SRVR_DONE_B */ 860 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 861} 862 863int dtls1_send_server_key_exchange(SSL *s) 864{ 865#ifndef OPENSSL_NO_RSA 866 unsigned char *q; 867 int j, num; 868 RSA *rsa; 869 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 870 unsigned int u; 871#endif 872#ifndef OPENSSL_NO_DH 873 DH *dh = NULL, *dhp; 874#endif 875 EVP_PKEY *pkey; 876 unsigned char *p, *d; 877 int al, i; 878 unsigned long type; 879 int n; 880 CERT *cert; 881 BIGNUM *r[4]; 882 int nr[4], kn; 883 BUF_MEM *buf; 884 EVP_MD_CTX md_ctx; 885 886 EVP_MD_CTX_init(&md_ctx); 887 if (s->state == SSL3_ST_SW_KEY_EXCH_A) { 888 type = s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK; 889 cert = s->cert; 890 891 buf = s->init_buf; 892 893 r[0] = r[1] = r[2] = r[3] = NULL; 894 n = 0; 895#ifndef OPENSSL_NO_RSA 896 if (type & SSL_kRSA) { 897 rsa = cert->rsa_tmp; 898 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) { 899 rsa = s->cert->rsa_tmp_cb(s, 900 SSL_C_IS_EXPORT(s->s3-> 901 tmp.new_cipher), 902 SSL_C_EXPORT_PKEYLENGTH(s->s3-> 903 tmp.new_cipher)); 904 if (rsa == NULL) { 905 al = SSL_AD_HANDSHAKE_FAILURE; 906 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 907 SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 908 goto f_err; 909 } 910 RSA_up_ref(rsa); 911 cert->rsa_tmp = rsa; 912 } 913 if (rsa == NULL) { 914 al = SSL_AD_HANDSHAKE_FAILURE; 915 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 916 SSL_R_MISSING_TMP_RSA_KEY); 917 goto f_err; 918 } 919 r[0] = rsa->n; 920 r[1] = rsa->e; 921 s->s3->tmp.use_rsa_tmp = 1; 922 } else 923#endif 924#ifndef OPENSSL_NO_DH 925 if (type & SSL_kEDH) { 926 dhp = cert->dh_tmp; 927 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 928 dhp = s->cert->dh_tmp_cb(s, 929 SSL_C_IS_EXPORT(s->s3-> 930 tmp.new_cipher), 931 SSL_C_EXPORT_PKEYLENGTH(s->s3-> 932 tmp.new_cipher)); 933 if (dhp == NULL) { 934 al = SSL_AD_HANDSHAKE_FAILURE; 935 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 936 SSL_R_MISSING_TMP_DH_KEY); 937 goto f_err; 938 } 939 940 if (s->s3->tmp.dh != NULL) { 941 DH_free(dh); 942 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 943 ERR_R_INTERNAL_ERROR); 944 goto err; 945 } 946 947 if ((dh = DHparams_dup(dhp)) == NULL) { 948 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); 949 goto err; 950 } 951 952 s->s3->tmp.dh = dh; 953 if ((dhp->pub_key == NULL || 954 dhp->priv_key == NULL || 955 (s->options & SSL_OP_SINGLE_DH_USE))) { 956 if (!DH_generate_key(dh)) { 957 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 958 ERR_R_DH_LIB); 959 goto err; 960 } 961 } else { 962 dh->pub_key = BN_dup(dhp->pub_key); 963 dh->priv_key = BN_dup(dhp->priv_key); 964 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) { 965 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 966 ERR_R_DH_LIB); 967 goto err; 968 } 969 } 970 r[0] = dh->p; 971 r[1] = dh->g; 972 r[2] = dh->pub_key; 973 } else 974#endif 975 { 976 al = SSL_AD_HANDSHAKE_FAILURE; 977 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 978 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 979 goto f_err; 980 } 981 for (i = 0; r[i] != NULL; i++) { 982 nr[i] = BN_num_bytes(r[i]); 983 n += 2 + nr[i]; 984 } 985 986 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) { 987 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher)) 988 == NULL) { 989 al = SSL_AD_DECODE_ERROR; 990 goto f_err; 991 } 992 kn = EVP_PKEY_size(pkey); 993 } else { 994 pkey = NULL; 995 kn = 0; 996 } 997 998 if (!BUF_MEM_grow_clean(buf, n + DTLS1_HM_HEADER_LENGTH + kn)) { 999 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF); 1000 goto err; 1001 } 1002 d = (unsigned char *)s->init_buf->data; 1003 p = &(d[DTLS1_HM_HEADER_LENGTH]); 1004 1005 for (i = 0; r[i] != NULL; i++) { 1006 s2n(nr[i], p); 1007 BN_bn2bin(r[i], p); 1008 p += nr[i]; 1009 } 1010 1011 /* not anonymous */ 1012 if (pkey != NULL) { 1013 /* 1014 * n is the length of the params, they start at 1015 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space at the 1016 * end. 1017 */ 1018#ifndef OPENSSL_NO_RSA 1019 if (pkey->type == EVP_PKEY_RSA) { 1020 q = md_buf; 1021 j = 0; 1022 for (num = 2; num > 0; num--) { 1023 EVP_DigestInit_ex(&md_ctx, (num == 2) 1024 ? s->ctx->md5 : s->ctx->sha1, NULL); 1025 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]), 1026 SSL3_RANDOM_SIZE); 1027 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]), 1028 SSL3_RANDOM_SIZE); 1029 EVP_DigestUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), 1030 n); 1031 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i); 1032 q += i; 1033 j += i; 1034 } 1035 if (RSA_sign(NID_md5_sha1, md_buf, j, 1036 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 1037 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA); 1038 goto err; 1039 } 1040 s2n(u, p); 1041 n += u + 2; 1042 } else 1043#endif 1044#if !defined(OPENSSL_NO_DSA) 1045 if (pkey->type == EVP_PKEY_DSA) { 1046 /* lets do DSS */ 1047 EVP_SignInit_ex(&md_ctx, EVP_dss1(), NULL); 1048 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]), 1049 SSL3_RANDOM_SIZE); 1050 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]), 1051 SSL3_RANDOM_SIZE); 1052 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n); 1053 if (!EVP_SignFinal(&md_ctx, &(p[2]), 1054 (unsigned int *)&i, pkey)) { 1055 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_DSA); 1056 goto err; 1057 } 1058 s2n(i, p); 1059 n += i + 2; 1060 } else 1061#endif 1062 { 1063 /* Is this error check actually needed? */ 1064 al = SSL_AD_HANDSHAKE_FAILURE; 1065 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1066 SSL_R_UNKNOWN_PKEY_TYPE); 1067 goto f_err; 1068 } 1069 } 1070 1071 d = dtls1_set_message_header(s, d, 1072 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1073 1074 /* 1075 * we should now have things packed up, so lets send it off 1076 */ 1077 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1078 s->init_off = 0; 1079 1080 /* buffer the message to handle re-xmits */ 1081 dtls1_buffer_message(s, 0); 1082 } 1083 1084 s->state = SSL3_ST_SW_KEY_EXCH_B; 1085 EVP_MD_CTX_cleanup(&md_ctx); 1086 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1087 f_err: 1088 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1089 err: 1090 EVP_MD_CTX_cleanup(&md_ctx); 1091 return (-1); 1092} 1093 1094int dtls1_send_certificate_request(SSL *s) 1095{ 1096 unsigned char *p, *d; 1097 int i, j, nl, off, n; 1098 STACK_OF(X509_NAME) *sk = NULL; 1099 X509_NAME *name; 1100 BUF_MEM *buf; 1101 unsigned int msg_len; 1102 1103 if (s->state == SSL3_ST_SW_CERT_REQ_A) { 1104 buf = s->init_buf; 1105 1106 d = p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1107 1108 /* get the list of acceptable cert types */ 1109 p++; 1110 n = ssl3_get_req_cert_type(s, p); 1111 d[0] = n; 1112 p += n; 1113 n++; 1114 1115 off = n; 1116 p += 2; 1117 n += 2; 1118 1119 sk = SSL_get_client_CA_list(s); 1120 nl = 0; 1121 if (sk != NULL) { 1122 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1123 name = sk_X509_NAME_value(sk, i); 1124 j = i2d_X509_NAME(name, NULL); 1125 if (!BUF_MEM_grow_clean 1126 (buf, DTLS1_HM_HEADER_LENGTH + n + j + 2)) { 1127 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST, 1128 ERR_R_BUF_LIB); 1129 goto err; 1130 } 1131 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + n]); 1132 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) { 1133 s2n(j, p); 1134 i2d_X509_NAME(name, &p); 1135 n += 2 + j; 1136 nl += 2 + j; 1137 } else { 1138 d = p; 1139 i2d_X509_NAME(name, &p); 1140 j -= 2; 1141 s2n(j, d); 1142 j += 2; 1143 n += j; 1144 nl += j; 1145 } 1146 } 1147 } 1148 /* else no CA names */ 1149 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + off]); 1150 s2n(nl, p); 1151 1152 d = (unsigned char *)buf->data; 1153 *(d++) = SSL3_MT_CERTIFICATE_REQUEST; 1154 l2n3(n, d); 1155 s2n(s->d1->handshake_write_seq, d); 1156 s->d1->handshake_write_seq++; 1157 1158 /* 1159 * we should now have things packed up, so lets send it off 1160 */ 1161 1162 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1163 s->init_off = 0; 1164#ifdef NETSCAPE_HANG_BUG 1165/* XXX: what to do about this? */ 1166 p = (unsigned char *)s->init_buf->data + s->init_num; 1167 1168 /* do the header */ 1169 *(p++) = SSL3_MT_SERVER_DONE; 1170 *(p++) = 0; 1171 *(p++) = 0; 1172 *(p++) = 0; 1173 s->init_num += 4; 1174#endif 1175 1176 /* XDTLS: set message header ? */ 1177 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1178 dtls1_set_message_header(s, (void *)s->init_buf->data, 1179 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, 1180 msg_len); 1181 1182 /* buffer the message to handle re-xmits */ 1183 dtls1_buffer_message(s, 0); 1184 1185 s->state = SSL3_ST_SW_CERT_REQ_B; 1186 } 1187 1188 /* SSL3_ST_SW_CERT_REQ_B */ 1189 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1190 err: 1191 return (-1); 1192} 1193 1194int dtls1_send_server_certificate(SSL *s) 1195{ 1196 unsigned long l; 1197 X509 *x; 1198 1199 if (s->state == SSL3_ST_SW_CERT_A) { 1200 x = ssl_get_server_send_cert(s); 1201 if (x == NULL && 1202 /* VRS: allow null cert if auth == KRB5 */ 1203 (s->s3->tmp.new_cipher->algorithms 1204 & (SSL_MKEY_MASK | SSL_AUTH_MASK)) 1205 != (SSL_aKRB5 | SSL_kKRB5)) { 1206 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1207 return (0); 1208 } 1209 1210 l = dtls1_output_cert_chain(s, x); 1211 s->state = SSL3_ST_SW_CERT_B; 1212 s->init_num = (int)l; 1213 s->init_off = 0; 1214 1215 /* buffer the message to handle re-xmits */ 1216 dtls1_buffer_message(s, 0); 1217 } 1218 1219 /* SSL3_ST_SW_CERT_B */ 1220 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1221} 1222 1223#ifndef OPENSSL_NO_TLSEXT 1224int dtls1_send_newsession_ticket(SSL *s) 1225{ 1226 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) { 1227 unsigned char *p, *senc, *macstart; 1228 int len, slen; 1229 unsigned int hlen, msg_len; 1230 EVP_CIPHER_CTX ctx; 1231 HMAC_CTX hctx; 1232 SSL_CTX *tctx = s->initial_ctx; 1233 unsigned char iv[EVP_MAX_IV_LENGTH]; 1234 unsigned char key_name[16]; 1235 1236 /* get session encoding length */ 1237 slen = i2d_SSL_SESSION(s->session, NULL); 1238 /* 1239 * Some length values are 16 bits, so forget it if session is too 1240 * long 1241 */ 1242 if (slen > 0xFF00) 1243 return -1; 1244 /* 1245 * Grow buffer if need be: the length calculation is as follows 12 1246 * (DTLS handshake message header) + 4 (ticket lifetime hint) + 2 1247 * (ticket length) + 16 (key name) + max_iv_len (iv length) + 1248 * session_length + max_enc_block_size (max encrypted session length) 1249 * + max_md_size (HMAC). 1250 */ 1251 if (!BUF_MEM_grow(s->init_buf, 1252 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1253 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1254 return -1; 1255 senc = OPENSSL_malloc(slen); 1256 if (!senc) 1257 return -1; 1258 p = senc; 1259 i2d_SSL_SESSION(s->session, &p); 1260 1261 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1262 EVP_CIPHER_CTX_init(&ctx); 1263 HMAC_CTX_init(&hctx); 1264 /* 1265 * Initialize HMAC and cipher contexts. If callback present it does 1266 * all the work otherwise use generated values from parent ctx. 1267 */ 1268 if (tctx->tlsext_ticket_key_cb) { 1269 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1270 &hctx, 1) < 0) { 1271 OPENSSL_free(senc); 1272 return -1; 1273 } 1274 } else { 1275 RAND_pseudo_bytes(iv, 16); 1276 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1277 tctx->tlsext_tick_aes_key, iv); 1278 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1279 tlsext_tick_md(), NULL); 1280 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1281 } 1282 l2n(s->session->tlsext_tick_lifetime_hint, p); 1283 /* Skip ticket length for now */ 1284 p += 2; 1285 /* Output key name */ 1286 macstart = p; 1287 memcpy(p, key_name, 16); 1288 p += 16; 1289 /* output IV */ 1290 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1291 p += EVP_CIPHER_CTX_iv_length(&ctx); 1292 /* Encrypt session data */ 1293 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1294 p += len; 1295 EVP_EncryptFinal(&ctx, p, &len); 1296 p += len; 1297 EVP_CIPHER_CTX_cleanup(&ctx); 1298 1299 HMAC_Update(&hctx, macstart, p - macstart); 1300 HMAC_Final(&hctx, p, &hlen); 1301 HMAC_CTX_cleanup(&hctx); 1302 1303 p += hlen; 1304 /* Now write out lengths: p points to end of data written */ 1305 /* Total length */ 1306 len = p - (unsigned char *)(s->init_buf->data); 1307 /* Ticket length */ 1308 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1309 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1310 1311 /* number of bytes to write */ 1312 s->init_num = len; 1313 s->state = SSL3_ST_SW_SESSION_TICKET_B; 1314 s->init_off = 0; 1315 OPENSSL_free(senc); 1316 1317 /* XDTLS: set message header ? */ 1318 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1319 dtls1_set_message_header(s, (void *)s->init_buf->data, 1320 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, 1321 msg_len); 1322 1323 /* buffer the message to handle re-xmits */ 1324 dtls1_buffer_message(s, 0); 1325 } 1326 1327 /* SSL3_ST_SW_SESSION_TICKET_B */ 1328 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1329} 1330#endif 1331