d1_srvr.c revision 277195
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, 142 dtls1_get_server_method) 143 144int dtls1_accept(SSL *s) 145 { 146 BUF_MEM *buf; 147 unsigned long l,Time=(unsigned long)time(NULL); 148 void (*cb)(const SSL *ssl,int type,int val)=NULL; 149 int ret= -1; 150 int new_state,state,skip=0; 151 int listen; 152 153 RAND_add(&Time,sizeof(Time),0); 154 ERR_clear_error(); 155 clear_sys_error(); 156 157 if (s->info_callback != NULL) 158 cb=s->info_callback; 159 else if (s->ctx->info_callback != NULL) 160 cb=s->ctx->info_callback; 161 162 listen = s->d1->listen; 163 164 /* init things to blank */ 165 s->in_handshake++; 166 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 167 168 s->d1->listen = listen; 169 170 if (s->cert == NULL) 171 { 172 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET); 173 return(-1); 174 } 175 176 for (;;) 177 { 178 state=s->state; 179 180 switch (s->state) 181 { 182 case SSL_ST_RENEGOTIATE: 183 s->new_session=1; 184 /* s->state=SSL_ST_ACCEPT; */ 185 186 case SSL_ST_BEFORE: 187 case SSL_ST_ACCEPT: 188 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 189 case SSL_ST_OK|SSL_ST_ACCEPT: 190 191 s->server=1; 192 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 193 194 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) 195 { 196 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 197 return -1; 198 } 199 s->type=SSL_ST_ACCEPT; 200 201 if (s->init_buf == NULL) 202 { 203 if ((buf=BUF_MEM_new()) == NULL) 204 { 205 ret= -1; 206 goto end; 207 } 208 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 209 { 210 ret= -1; 211 goto end; 212 } 213 s->init_buf=buf; 214 } 215 216 if (!ssl3_setup_buffers(s)) 217 { 218 ret= -1; 219 goto end; 220 } 221 222 s->init_num=0; 223 224 if (s->state != SSL_ST_RENEGOTIATE) 225 { 226 /* Ok, we now need to push on a buffering BIO so that 227 * the output is sent in a way that TCP likes :-) 228 */ 229 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } 230 231 ssl3_init_finished_mac(s); 232 s->state=SSL3_ST_SR_CLNT_HELLO_A; 233 s->ctx->stats.sess_accept++; 234 } 235 else 236 { 237 /* s->state == SSL_ST_RENEGOTIATE, 238 * we will just send a HelloRequest */ 239 s->ctx->stats.sess_accept_renegotiate++; 240 s->state=SSL3_ST_SW_HELLO_REQ_A; 241 } 242 243 break; 244 245 case SSL3_ST_SW_HELLO_REQ_A: 246 case SSL3_ST_SW_HELLO_REQ_B: 247 248 s->shutdown=0; 249 dtls1_clear_record_buffer(s); 250 dtls1_start_timer(s); 251 ret=dtls1_send_hello_request(s); 252 if (ret <= 0) goto end; 253 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 254 s->state=SSL3_ST_SW_FLUSH; 255 s->init_num=0; 256 257 ssl3_init_finished_mac(s); 258 break; 259 260 case SSL3_ST_SW_HELLO_REQ_C: 261 s->state=SSL_ST_OK; 262 break; 263 264 case SSL3_ST_SR_CLNT_HELLO_A: 265 case SSL3_ST_SR_CLNT_HELLO_B: 266 case SSL3_ST_SR_CLNT_HELLO_C: 267 268 s->shutdown=0; 269 ret=ssl3_get_client_hello(s); 270 if (ret <= 0) goto end; 271 dtls1_stop_timer(s); 272 273 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 274 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 275 else 276 s->state = SSL3_ST_SW_SRVR_HELLO_A; 277 278 s->init_num=0; 279 280 /* Reflect ClientHello sequence to remain stateless while listening */ 281 if (listen) 282 { 283 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence)); 284 } 285 286 /* If we're just listening, stop here */ 287 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) 288 { 289 ret = 2; 290 s->d1->listen = 0; 291 /* Set expected sequence numbers 292 * 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) goto end; 307 s->state=SSL3_ST_SW_FLUSH; 308 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 309 310 /* HelloVerifyRequests resets Finished MAC */ 311 if (s->client_version != DTLS1_BAD_VER) 312 ssl3_init_finished_mac(s); 313 break; 314 315 case SSL3_ST_SW_SRVR_HELLO_A: 316 case SSL3_ST_SW_SRVR_HELLO_B: 317 s->new_session = 2; 318 dtls1_start_timer(s); 319 ret=dtls1_send_server_hello(s); 320 if (ret <= 0) goto end; 321 322#ifndef OPENSSL_NO_TLSEXT 323 if (s->hit) 324 { 325 if (s->tlsext_ticket_expected) 326 s->state=SSL3_ST_SW_SESSION_TICKET_A; 327 else 328 s->state=SSL3_ST_SW_CHANGE_A; 329 } 330#else 331 if (s->hit) 332 s->state=SSL3_ST_SW_CHANGE_A; 333#endif 334 else 335 s->state=SSL3_ST_SW_CERT_A; 336 s->init_num=0; 337 break; 338 339 case SSL3_ST_SW_CERT_A: 340 case SSL3_ST_SW_CERT_B: 341 /* Check if it is anon DH */ 342 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) 343 { 344 dtls1_start_timer(s); 345 ret=dtls1_send_server_certificate(s); 346 if (ret <= 0) goto end; 347#ifndef OPENSSL_NO_TLSEXT 348 if (s->tlsext_status_expected) 349 s->state=SSL3_ST_SW_CERT_STATUS_A; 350 else 351 s->state=SSL3_ST_SW_KEY_EXCH_A; 352 } 353 else 354 { 355 skip = 1; 356 s->state=SSL3_ST_SW_KEY_EXCH_A; 357 } 358#else 359 } 360 else 361 skip=1; 362 363 s->state=SSL3_ST_SW_KEY_EXCH_A; 364#endif 365 s->init_num=0; 366 break; 367 368 case SSL3_ST_SW_KEY_EXCH_A: 369 case SSL3_ST_SW_KEY_EXCH_B: 370 l=s->s3->tmp.new_cipher->algorithms; 371 372 /* clear this, it may get reset by 373 * send_server_key_exchange */ 374 s->s3->tmp.use_rsa_tmp=0; 375 376 /* only send if a DH key exchange, fortezza or 377 * RSA but we have a sign only certificate */ 378 if ((l & (SSL_DH|SSL_kFZA)) 379 || ((l & SSL_kRSA) 380 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 381 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 382 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 383 ) 384 ) 385 ) 386 ) 387 { 388 dtls1_start_timer(s); 389 ret=dtls1_send_server_key_exchange(s); 390 if (ret <= 0) goto end; 391 } 392 else 393 skip=1; 394 395 s->state=SSL3_ST_SW_CERT_REQ_A; 396 s->init_num=0; 397 break; 398 399 case SSL3_ST_SW_CERT_REQ_A: 400 case SSL3_ST_SW_CERT_REQ_B: 401 if (/* don't request cert unless asked for it: */ 402 !(s->verify_mode & SSL_VERIFY_PEER) || 403 /* if SSL_VERIFY_CLIENT_ONCE is set, 404 * don't request cert during re-negotiation: */ 405 ((s->session->peer != NULL) && 406 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 407 /* never request cert in anonymous ciphersuites 408 * (see section "Certificate request" in SSL 3 drafts 409 * and in RFC 2246): */ 410 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) && 411 /* ... except when the application insists on verification 412 * (against the specs, but s3_clnt.c accepts this for SSL 3) */ 413 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 414 /* never request cert in Kerberos ciphersuites */ 415 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5)) 416 { 417 /* no cert request */ 418 skip=1; 419 s->s3->tmp.cert_request=0; 420 s->state=SSL3_ST_SW_SRVR_DONE_A; 421 } 422 else 423 { 424 s->s3->tmp.cert_request=1; 425 dtls1_start_timer(s); 426 ret=dtls1_send_certificate_request(s); 427 if (ret <= 0) goto end; 428#ifndef NETSCAPE_HANG_BUG 429 s->state=SSL3_ST_SW_SRVR_DONE_A; 430#else 431 s->state=SSL3_ST_SW_FLUSH; 432 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 433#endif 434 s->init_num=0; 435 } 436 break; 437 438 case SSL3_ST_SW_SRVR_DONE_A: 439 case SSL3_ST_SW_SRVR_DONE_B: 440 dtls1_start_timer(s); 441 ret=dtls1_send_server_done(s); 442 if (ret <= 0) goto end; 443 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 444 s->state=SSL3_ST_SW_FLUSH; 445 s->init_num=0; 446 break; 447 448 case SSL3_ST_SW_FLUSH: 449 s->rwstate=SSL_WRITING; 450 if (BIO_flush(s->wbio) <= 0) 451 { 452 ret= -1; 453 goto end; 454 } 455 s->rwstate=SSL_NOTHING; 456 s->state=s->s3->tmp.next_state; 457 break; 458 459 case SSL3_ST_SR_CERT_A: 460 case SSL3_ST_SR_CERT_B: 461 /* Check for second client hello (MS SGC) */ 462 ret = ssl3_check_client_hello(s); 463 if (ret <= 0) 464 goto end; 465 if (ret == 2) 466 { 467 dtls1_stop_timer(s); 468 s->state = SSL3_ST_SR_CLNT_HELLO_C; 469 } 470 else { 471 /* could be sent for a DH cert, even if we 472 * have not asked for it :-) */ 473 ret=ssl3_get_client_certificate(s); 474 if (ret <= 0) goto end; 475 s->init_num=0; 476 s->state=SSL3_ST_SR_KEY_EXCH_A; 477 } 478 break; 479 480 case SSL3_ST_SR_KEY_EXCH_A: 481 case SSL3_ST_SR_KEY_EXCH_B: 482 ret=ssl3_get_client_key_exchange(s); 483 if (ret <= 0) goto end; 484 s->state=SSL3_ST_SR_CERT_VRFY_A; 485 s->init_num=0; 486 487 /* We need to get hashes here so if there is 488 * a client cert, it can be verified */ 489 s->method->ssl3_enc->cert_verify_mac(s, 490 &(s->s3->finish_dgst1), 491 &(s->s3->tmp.cert_verify_md[0])); 492 s->method->ssl3_enc->cert_verify_mac(s, 493 &(s->s3->finish_dgst2), 494 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); 495 496 break; 497 498 case SSL3_ST_SR_CERT_VRFY_A: 499 case SSL3_ST_SR_CERT_VRFY_B: 500 501 s->d1->change_cipher_spec_ok = 1; 502 /* we should decide if we expected this one */ 503 ret=ssl3_get_cert_verify(s); 504 if (ret <= 0) goto end; 505 506 s->state=SSL3_ST_SR_FINISHED_A; 507 s->init_num=0; 508 break; 509 510 case SSL3_ST_SR_FINISHED_A: 511 case SSL3_ST_SR_FINISHED_B: 512 s->d1->change_cipher_spec_ok = 1; 513 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, 514 SSL3_ST_SR_FINISHED_B); 515 if (ret <= 0) goto end; 516 dtls1_stop_timer(s); 517 if (s->hit) 518 s->state=SSL_ST_OK; 519#ifndef OPENSSL_NO_TLSEXT 520 else if (s->tlsext_ticket_expected) 521 s->state=SSL3_ST_SW_SESSION_TICKET_A; 522#endif 523 else 524 s->state=SSL3_ST_SW_CHANGE_A; 525 s->init_num=0; 526 break; 527 528#ifndef OPENSSL_NO_TLSEXT 529 case SSL3_ST_SW_SESSION_TICKET_A: 530 case SSL3_ST_SW_SESSION_TICKET_B: 531 ret=dtls1_send_newsession_ticket(s); 532 if (ret <= 0) goto end; 533 s->state=SSL3_ST_SW_CHANGE_A; 534 s->init_num=0; 535 break; 536 537 case SSL3_ST_SW_CERT_STATUS_A: 538 case SSL3_ST_SW_CERT_STATUS_B: 539 ret=ssl3_send_cert_status(s); 540 if (ret <= 0) goto end; 541 s->state=SSL3_ST_SW_KEY_EXCH_A; 542 s->init_num=0; 543 break; 544 545#endif 546 547 case SSL3_ST_SW_CHANGE_A: 548 case SSL3_ST_SW_CHANGE_B: 549 550 s->session->cipher=s->s3->tmp.new_cipher; 551 if (!s->method->ssl3_enc->setup_key_block(s)) 552 { ret= -1; goto end; } 553 554 ret=dtls1_send_change_cipher_spec(s, 555 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); 556 557 if (ret <= 0) goto end; 558 s->state=SSL3_ST_SW_FINISHED_A; 559 s->init_num=0; 560 561 if (!s->method->ssl3_enc->change_cipher_state(s, 562 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 563 { 564 ret= -1; 565 goto end; 566 } 567 568 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 569 break; 570 571 case SSL3_ST_SW_FINISHED_A: 572 case SSL3_ST_SW_FINISHED_B: 573 ret=dtls1_send_finished(s, 574 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, 575 s->method->ssl3_enc->server_finished_label, 576 s->method->ssl3_enc->server_finished_label_len); 577 if (ret <= 0) goto end; 578 s->state=SSL3_ST_SW_FLUSH; 579 if (s->hit) 580 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; 581 else 582 s->s3->tmp.next_state=SSL_ST_OK; 583 s->init_num=0; 584 break; 585 586 case SSL_ST_OK: 587 /* clean a few things up */ 588 ssl3_cleanup_key_block(s); 589 590#if 0 591 BUF_MEM_free(s->init_buf); 592 s->init_buf=NULL; 593#endif 594 595 /* remove buffering on output */ 596 ssl_free_wbio_buffer(s); 597 598 s->init_num=0; 599 600 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */ 601 { 602 /* actually not necessarily a 'new' session unless 603 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */ 604 605 s->new_session=0; 606 607 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 608 609 s->ctx->stats.sess_accept_good++; 610 /* s->server=1; */ 611 s->handshake_func=dtls1_accept; 612 613 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 614 } 615 616 ret = 1; 617 618 /* done handshaking, next message is client hello */ 619 s->d1->handshake_read_seq = 0; 620 /* next message is server hello */ 621 s->d1->handshake_write_seq = 0; 622 s->d1->next_handshake_write_seq = 0; 623 goto end; 624 /* break; */ 625 626 default: 627 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); 628 ret= -1; 629 goto end; 630 /* break; */ 631 } 632 633 if (!s->s3->tmp.reuse_message && !skip) 634 { 635 if (s->debug) 636 { 637 if ((ret=BIO_flush(s->wbio)) <= 0) 638 goto end; 639 } 640 641 642 if ((cb != NULL) && (s->state != state)) 643 { 644 new_state=s->state; 645 s->state=state; 646 cb(s,SSL_CB_ACCEPT_LOOP,1); 647 s->state=new_state; 648 } 649 } 650 skip=0; 651 } 652end: 653 /* BIO_flush(s->wbio); */ 654 655 s->in_handshake--; 656 if (cb != NULL) 657 cb(s,SSL_CB_ACCEPT_EXIT,ret); 658 return(ret); 659 } 660 661int dtls1_send_hello_request(SSL *s) 662 { 663 unsigned char *p; 664 665 if (s->state == SSL3_ST_SW_HELLO_REQ_A) 666 { 667 p=(unsigned char *)s->init_buf->data; 668 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 669 670 s->state=SSL3_ST_SW_HELLO_REQ_B; 671 /* number of bytes to write */ 672 s->init_num=DTLS1_HM_HEADER_LENGTH; 673 s->init_off=0; 674 675 /* no need to buffer this message, since there are no retransmit 676 * requests for it */ 677 } 678 679 /* SSL3_ST_SW_HELLO_REQ_B */ 680 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 681 } 682 683int dtls1_send_hello_verify_request(SSL *s) 684 { 685 unsigned int msg_len; 686 unsigned char *msg, *buf, *p; 687 688 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) 689 { 690 buf = (unsigned char *)s->init_buf->data; 691 692 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 693 if (s->client_version == DTLS1_BAD_VER) 694 *(p++) = DTLS1_BAD_VER>>8, 695 *(p++) = DTLS1_BAD_VER&0xff; 696 else 697 *(p++) = s->version >> 8, 698 *(p++) = s->version & 0xFF; 699 700 if (s->ctx->app_gen_cookie_cb == NULL || 701 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 702 &(s->d1->cookie_len)) == 0) 703 { 704 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); 705 return 0; 706 } 707 708 *(p++) = (unsigned char) s->d1->cookie_len; 709 memcpy(p, s->d1->cookie, s->d1->cookie_len); 710 p += s->d1->cookie_len; 711 msg_len = p - msg; 712 713 dtls1_set_message_header(s, buf, 714 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); 715 716 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 717 /* number of bytes to write */ 718 s->init_num=p-buf; 719 s->init_off=0; 720 } 721 722 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 723 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 724 } 725 726int dtls1_send_server_hello(SSL *s) 727 { 728 unsigned char *buf; 729 unsigned char *p,*d; 730 int i; 731 unsigned int sl; 732 unsigned long l,Time; 733 734 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) 735 { 736 buf=(unsigned char *)s->init_buf->data; 737 p=s->s3->server_random; 738 Time=(unsigned long)time(NULL); /* Time */ 739 l2n(Time,p); 740 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4); 741 /* Do the message type and length last */ 742 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 743 744 if (s->client_version == DTLS1_BAD_VER) 745 *(p++)=DTLS1_BAD_VER>>8, 746 *(p++)=DTLS1_BAD_VER&0xff; 747 else 748 *(p++)=s->version>>8, 749 *(p++)=s->version&0xff; 750 751 /* Random stuff */ 752 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 753 p+=SSL3_RANDOM_SIZE; 754 755 /* now in theory we have 3 options to sending back the 756 * session id. If it is a re-use, we send back the 757 * old session-id, if it is a new session, we send 758 * back the new session-id or we send back a 0 length 759 * session-id if we want it to be single use. 760 * Currently I will not implement the '0' length session-id 761 * 12-Jan-98 - I'll now support the '0' length stuff. 762 */ 763 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 764 s->session->session_id_length=0; 765 766 sl=s->session->session_id_length; 767 if (sl > sizeof s->session->session_id) 768 { 769 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 770 return -1; 771 } 772 *(p++)=sl; 773 memcpy(p,s->session->session_id,sl); 774 p+=sl; 775 776 /* put the cipher */ 777 if (s->s3->tmp.new_cipher == NULL) 778 return -1; 779 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); 780 p+=i; 781 782 /* put the compression method */ 783#ifdef OPENSSL_NO_COMP 784 *(p++)=0; 785#else 786 if (s->s3->tmp.new_compression == NULL) 787 *(p++)=0; 788 else 789 *(p++)=s->s3->tmp.new_compression->id; 790#endif 791 792#ifndef OPENSSL_NO_TLSEXT 793 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 794 { 795 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR); 796 return -1; 797 } 798#endif 799 800 /* do the header */ 801 l=(p-d); 802 d=buf; 803 804 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 805 806 s->state=SSL3_ST_SW_SRVR_HELLO_B; 807 /* number of bytes to write */ 808 s->init_num=p-buf; 809 s->init_off=0; 810 811 /* buffer the message to handle re-xmits */ 812 dtls1_buffer_message(s, 0); 813 } 814 815 /* SSL3_ST_SW_SRVR_HELLO_B */ 816 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 817 } 818 819int dtls1_send_server_done(SSL *s) 820 { 821 unsigned char *p; 822 823 if (s->state == SSL3_ST_SW_SRVR_DONE_A) 824 { 825 p=(unsigned char *)s->init_buf->data; 826 827 /* do the header */ 828 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 829 830 s->state=SSL3_ST_SW_SRVR_DONE_B; 831 /* number of bytes to write */ 832 s->init_num=DTLS1_HM_HEADER_LENGTH; 833 s->init_off=0; 834 835 /* buffer the message to handle re-xmits */ 836 dtls1_buffer_message(s, 0); 837 } 838 839 /* SSL3_ST_SW_SRVR_DONE_B */ 840 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 841 } 842 843int dtls1_send_server_key_exchange(SSL *s) 844 { 845#ifndef OPENSSL_NO_RSA 846 unsigned char *q; 847 int j,num; 848 RSA *rsa; 849 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 850 unsigned int u; 851#endif 852#ifndef OPENSSL_NO_DH 853 DH *dh=NULL,*dhp; 854#endif 855 EVP_PKEY *pkey; 856 unsigned char *p,*d; 857 int al,i; 858 unsigned long type; 859 int n; 860 CERT *cert; 861 BIGNUM *r[4]; 862 int nr[4],kn; 863 BUF_MEM *buf; 864 EVP_MD_CTX md_ctx; 865 866 EVP_MD_CTX_init(&md_ctx); 867 if (s->state == SSL3_ST_SW_KEY_EXCH_A) 868 { 869 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK; 870 cert=s->cert; 871 872 buf=s->init_buf; 873 874 r[0]=r[1]=r[2]=r[3]=NULL; 875 n=0; 876#ifndef OPENSSL_NO_RSA 877 if (type & SSL_kRSA) 878 { 879 rsa=cert->rsa_tmp; 880 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) 881 { 882 rsa=s->cert->rsa_tmp_cb(s, 883 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 884 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 885 if(rsa == NULL) 886 { 887 al=SSL_AD_HANDSHAKE_FAILURE; 888 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 889 goto f_err; 890 } 891 RSA_up_ref(rsa); 892 cert->rsa_tmp=rsa; 893 } 894 if (rsa == NULL) 895 { 896 al=SSL_AD_HANDSHAKE_FAILURE; 897 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); 898 goto f_err; 899 } 900 r[0]=rsa->n; 901 r[1]=rsa->e; 902 s->s3->tmp.use_rsa_tmp=1; 903 } 904 else 905#endif 906#ifndef OPENSSL_NO_DH 907 if (type & SSL_kEDH) 908 { 909 dhp=cert->dh_tmp; 910 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 911 dhp=s->cert->dh_tmp_cb(s, 912 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 913 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 914 if (dhp == NULL) 915 { 916 al=SSL_AD_HANDSHAKE_FAILURE; 917 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 918 goto f_err; 919 } 920 921 if (s->s3->tmp.dh != NULL) 922 { 923 DH_free(dh); 924 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 925 goto err; 926 } 927 928 if ((dh=DHparams_dup(dhp)) == NULL) 929 { 930 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 931 goto err; 932 } 933 934 s->s3->tmp.dh=dh; 935 if ((dhp->pub_key == NULL || 936 dhp->priv_key == NULL || 937 (s->options & SSL_OP_SINGLE_DH_USE))) 938 { 939 if(!DH_generate_key(dh)) 940 { 941 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 942 ERR_R_DH_LIB); 943 goto err; 944 } 945 } 946 else 947 { 948 dh->pub_key=BN_dup(dhp->pub_key); 949 dh->priv_key=BN_dup(dhp->priv_key); 950 if ((dh->pub_key == NULL) || 951 (dh->priv_key == NULL)) 952 { 953 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 954 goto err; 955 } 956 } 957 r[0]=dh->p; 958 r[1]=dh->g; 959 r[2]=dh->pub_key; 960 } 961 else 962#endif 963 { 964 al=SSL_AD_HANDSHAKE_FAILURE; 965 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 966 goto f_err; 967 } 968 for (i=0; r[i] != NULL; i++) 969 { 970 nr[i]=BN_num_bytes(r[i]); 971 n+=2+nr[i]; 972 } 973 974 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) 975 { 976 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher)) 977 == NULL) 978 { 979 al=SSL_AD_DECODE_ERROR; 980 goto f_err; 981 } 982 kn=EVP_PKEY_size(pkey); 983 } 984 else 985 { 986 pkey=NULL; 987 kn=0; 988 } 989 990 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) 991 { 992 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); 993 goto err; 994 } 995 d=(unsigned char *)s->init_buf->data; 996 p= &(d[DTLS1_HM_HEADER_LENGTH]); 997 998 for (i=0; r[i] != NULL; i++) 999 { 1000 s2n(nr[i],p); 1001 BN_bn2bin(r[i],p); 1002 p+=nr[i]; 1003 } 1004 1005 /* not anonymous */ 1006 if (pkey != NULL) 1007 { 1008 /* n is the length of the params, they start at 1009 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space 1010 * at the end. */ 1011#ifndef OPENSSL_NO_RSA 1012 if (pkey->type == EVP_PKEY_RSA) 1013 { 1014 q=md_buf; 1015 j=0; 1016 for (num=2; num > 0; num--) 1017 { 1018 EVP_DigestInit_ex(&md_ctx,(num == 2) 1019 ?s->ctx->md5:s->ctx->sha1, NULL); 1020 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1021 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1022 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1023 EVP_DigestFinal_ex(&md_ctx,q, 1024 (unsigned int *)&i); 1025 q+=i; 1026 j+=i; 1027 } 1028 if (RSA_sign(NID_md5_sha1, md_buf, j, 1029 &(p[2]), &u, pkey->pkey.rsa) <= 0) 1030 { 1031 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); 1032 goto err; 1033 } 1034 s2n(u,p); 1035 n+=u+2; 1036 } 1037 else 1038#endif 1039#if !defined(OPENSSL_NO_DSA) 1040 if (pkey->type == EVP_PKEY_DSA) 1041 { 1042 /* lets do DSS */ 1043 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); 1044 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1045 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1046 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1047 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1048 (unsigned int *)&i,pkey)) 1049 { 1050 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); 1051 goto err; 1052 } 1053 s2n(i,p); 1054 n+=i+2; 1055 } 1056 else 1057#endif 1058 { 1059 /* Is this error check actually needed? */ 1060 al=SSL_AD_HANDSHAKE_FAILURE; 1061 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); 1062 goto f_err; 1063 } 1064 } 1065 1066 d = dtls1_set_message_header(s, d, 1067 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1068 1069 /* we should now have things packed up, so lets send 1070 * it off */ 1071 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1072 s->init_off=0; 1073 1074 /* buffer the message to handle re-xmits */ 1075 dtls1_buffer_message(s, 0); 1076 } 1077 1078 s->state = SSL3_ST_SW_KEY_EXCH_B; 1079 EVP_MD_CTX_cleanup(&md_ctx); 1080 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1081f_err: 1082 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1083err: 1084 EVP_MD_CTX_cleanup(&md_ctx); 1085 return(-1); 1086 } 1087 1088int dtls1_send_certificate_request(SSL *s) 1089 { 1090 unsigned char *p,*d; 1091 int i,j,nl,off,n; 1092 STACK_OF(X509_NAME) *sk=NULL; 1093 X509_NAME *name; 1094 BUF_MEM *buf; 1095 unsigned int msg_len; 1096 1097 if (s->state == SSL3_ST_SW_CERT_REQ_A) 1098 { 1099 buf=s->init_buf; 1100 1101 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1102 1103 /* get the list of acceptable cert types */ 1104 p++; 1105 n=ssl3_get_req_cert_type(s,p); 1106 d[0]=n; 1107 p+=n; 1108 n++; 1109 1110 off=n; 1111 p+=2; 1112 n+=2; 1113 1114 sk=SSL_get_client_CA_list(s); 1115 nl=0; 1116 if (sk != NULL) 1117 { 1118 for (i=0; i<sk_X509_NAME_num(sk); i++) 1119 { 1120 name=sk_X509_NAME_value(sk,i); 1121 j=i2d_X509_NAME(name,NULL); 1122 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2)) 1123 { 1124 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); 1125 goto err; 1126 } 1127 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]); 1128 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 1129 { 1130 s2n(j,p); 1131 i2d_X509_NAME(name,&p); 1132 n+=2+j; 1133 nl+=2+j; 1134 } 1135 else 1136 { 1137 d=p; 1138 i2d_X509_NAME(name,&p); 1139 j-=2; s2n(j,d); j+=2; 1140 n+=j; 1141 nl+=j; 1142 } 1143 } 1144 } 1145 /* else no CA names */ 1146 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); 1147 s2n(nl,p); 1148 1149 d=(unsigned char *)buf->data; 1150 *(d++)=SSL3_MT_CERTIFICATE_REQUEST; 1151 l2n3(n,d); 1152 s2n(s->d1->handshake_write_seq,d); 1153 s->d1->handshake_write_seq++; 1154 1155 /* we should now have things packed up, so lets send 1156 * it off */ 1157 1158 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1159 s->init_off=0; 1160#ifdef NETSCAPE_HANG_BUG 1161/* XXX: what to do about this? */ 1162 p=(unsigned char *)s->init_buf->data + s->init_num; 1163 1164 /* do the header */ 1165 *(p++)=SSL3_MT_SERVER_DONE; 1166 *(p++)=0; 1167 *(p++)=0; 1168 *(p++)=0; 1169 s->init_num += 4; 1170#endif 1171 1172 /* XDTLS: set message header ? */ 1173 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1174 dtls1_set_message_header(s, (void *)s->init_buf->data, 1175 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); 1176 1177 /* buffer the message to handle re-xmits */ 1178 dtls1_buffer_message(s, 0); 1179 1180 s->state = SSL3_ST_SW_CERT_REQ_B; 1181 } 1182 1183 /* SSL3_ST_SW_CERT_REQ_B */ 1184 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1185err: 1186 return(-1); 1187 } 1188 1189int dtls1_send_server_certificate(SSL *s) 1190 { 1191 unsigned long l; 1192 X509 *x; 1193 1194 if (s->state == SSL3_ST_SW_CERT_A) 1195 { 1196 x=ssl_get_server_send_cert(s); 1197 if (x == NULL && 1198 /* VRS: allow null cert if auth == KRB5 */ 1199 (s->s3->tmp.new_cipher->algorithms 1200 & (SSL_MKEY_MASK|SSL_AUTH_MASK)) 1201 != (SSL_aKRB5|SSL_kKRB5)) 1202 { 1203 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1204 return(0); 1205 } 1206 1207 l=dtls1_output_cert_chain(s,x); 1208 s->state=SSL3_ST_SW_CERT_B; 1209 s->init_num=(int)l; 1210 s->init_off=0; 1211 1212 /* buffer the message to handle re-xmits */ 1213 dtls1_buffer_message(s, 0); 1214 } 1215 1216 /* SSL3_ST_SW_CERT_B */ 1217 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1218 } 1219 1220#ifndef OPENSSL_NO_TLSEXT 1221int dtls1_send_newsession_ticket(SSL *s) 1222 { 1223 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) 1224 { 1225 unsigned char *p, *senc, *macstart; 1226 int len, slen; 1227 unsigned int hlen, msg_len; 1228 EVP_CIPHER_CTX ctx; 1229 HMAC_CTX hctx; 1230 SSL_CTX *tctx = s->initial_ctx; 1231 unsigned char iv[EVP_MAX_IV_LENGTH]; 1232 unsigned char key_name[16]; 1233 1234 /* get session encoding length */ 1235 slen = i2d_SSL_SESSION(s->session, NULL); 1236 /* Some length values are 16 bits, so forget it if session is 1237 * too long 1238 */ 1239 if (slen > 0xFF00) 1240 return -1; 1241 /* Grow buffer if need be: the length calculation is as 1242 * follows 12 (DTLS handshake message header) + 1243 * 4 (ticket lifetime hint) + 2 (ticket length) + 1244 * 16 (key name) + max_iv_len (iv length) + 1245 * session_length + max_enc_block_size (max encrypted session 1246 * length) + max_md_size (HMAC). 1247 */ 1248 if (!BUF_MEM_grow(s->init_buf, 1249 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1250 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1251 return -1; 1252 senc = OPENSSL_malloc(slen); 1253 if (!senc) 1254 return -1; 1255 p = senc; 1256 i2d_SSL_SESSION(s->session, &p); 1257 1258 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1259 EVP_CIPHER_CTX_init(&ctx); 1260 HMAC_CTX_init(&hctx); 1261 /* Initialize HMAC and cipher contexts. If callback present 1262 * it does all the work otherwise use generated values 1263 * from parent ctx. 1264 */ 1265 if (tctx->tlsext_ticket_key_cb) 1266 { 1267 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1268 &hctx, 1) < 0) 1269 { 1270 OPENSSL_free(senc); 1271 return -1; 1272 } 1273 } 1274 else 1275 { 1276 RAND_pseudo_bytes(iv, 16); 1277 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1278 tctx->tlsext_tick_aes_key, iv); 1279 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1280 tlsext_tick_md(), NULL); 1281 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1282 } 1283 l2n(s->session->tlsext_tick_lifetime_hint, p); 1284 /* Skip ticket length for now */ 1285 p += 2; 1286 /* Output key name */ 1287 macstart = p; 1288 memcpy(p, key_name, 16); 1289 p += 16; 1290 /* output IV */ 1291 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1292 p += EVP_CIPHER_CTX_iv_length(&ctx); 1293 /* Encrypt session data */ 1294 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1295 p += len; 1296 EVP_EncryptFinal(&ctx, p, &len); 1297 p += len; 1298 EVP_CIPHER_CTX_cleanup(&ctx); 1299 1300 HMAC_Update(&hctx, macstart, p - macstart); 1301 HMAC_Final(&hctx, p, &hlen); 1302 HMAC_CTX_cleanup(&hctx); 1303 1304 p += hlen; 1305 /* Now write out lengths: p points to end of data written */ 1306 /* Total length */ 1307 len = p - (unsigned char *)(s->init_buf->data); 1308 /* Ticket length */ 1309 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1310 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1311 1312 /* number of bytes to write */ 1313 s->init_num= len; 1314 s->state=SSL3_ST_SW_SESSION_TICKET_B; 1315 s->init_off=0; 1316 OPENSSL_free(senc); 1317 1318 /* XDTLS: set message header ? */ 1319 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1320 dtls1_set_message_header(s, (void *)s->init_buf->data, 1321 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, 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