1 /* ssl/d1_srvr.c */ 2 /* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh (at) cryptsoft.com). 57 * 58 */ 59 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 127 128 static SSL_METHOD *dtls1_get_server_method(int ver); 129 static int dtls1_send_hello_verify_request(SSL *s); 130 131 static 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 } 138 139 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method, 140 dtls1_accept, 141 ssl_undefined_function, 142 dtls1_get_server_method) 143 144 int 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; 151 152 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 /* init things to blank */ 162 s->in_handshake++; 163 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 164 165 if (s->cert == NULL) 166 { 167 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET); 168 return(-1); 169 } 170 171 for (;;) 172 { 173 state=s->state; 174 175 switch (s->state) 176 { 177 case SSL_ST_RENEGOTIATE: 178 s->new_session=1; 179 /* s->state=SSL_ST_ACCEPT; */ 180 181 case SSL_ST_BEFORE: 182 case SSL_ST_ACCEPT: 183 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 184 case SSL_ST_OK|SSL_ST_ACCEPT: 185 186 s->server=1; 187 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 188 189 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) 190 { 191 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 192 return -1; 193 } 194 s->type=SSL_ST_ACCEPT; 195 196 if (s->init_buf == NULL) 197 { 198 if ((buf=BUF_MEM_new()) == NULL) 199 { 200 ret= -1; 201 goto end; 202 } 203 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 204 { 205 ret= -1; 206 goto end; 207 } 208 s->init_buf=buf; 209 } 210 211 if (!ssl3_setup_buffers(s)) 212 { 213 ret= -1; 214 goto end; 215 } 216 217 s->init_num=0; 218 219 if (s->state != SSL_ST_RENEGOTIATE) 220 { 221 /* Ok, we now need to push on a buffering BIO so that 222 * the output is sent in a way that TCP likes :-) 223 */ 224 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } 225 226 ssl3_init_finished_mac(s); 227 s->state=SSL3_ST_SR_CLNT_HELLO_A; 228 s->ctx->stats.sess_accept++; 229 } 230 else 231 { 232 /* s->state == SSL_ST_RENEGOTIATE, 233 * we will just send a HelloRequest */ 234 s->ctx->stats.sess_accept_renegotiate++; 235 s->state=SSL3_ST_SW_HELLO_REQ_A; 236 } 237 238 break; 239 240 case SSL3_ST_SW_HELLO_REQ_A: 241 case SSL3_ST_SW_HELLO_REQ_B: 242 243 s->shutdown=0; 244 dtls1_start_timer(s); 245 ret=dtls1_send_hello_request(s); 246 if (ret <= 0) goto end; 247 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C; 248 s->state=SSL3_ST_SW_FLUSH; 249 s->init_num=0; 250 251 ssl3_init_finished_mac(s); 252 break; 253 254 case SSL3_ST_SW_HELLO_REQ_C: 255 s->state=SSL_ST_OK; 256 break; 257 258 case SSL3_ST_SR_CLNT_HELLO_A: 259 case SSL3_ST_SR_CLNT_HELLO_B: 260 case SSL3_ST_SR_CLNT_HELLO_C: 261 262 s->shutdown=0; 263 ret=ssl3_get_client_hello(s); 264 if (ret <= 0) goto end; 265 dtls1_stop_timer(s); 266 267 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 268 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 269 else 270 s->state = SSL3_ST_SW_SRVR_HELLO_A; 271 272 s->init_num=0; 273 274 /* If we're just listening, stop here */ 275 if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) 276 { 277 ret = 2; 278 s->d1->listen = 0; 279 goto end; 280 } 281 282 break; 283 284 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 285 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 286 287 dtls1_start_timer(s); 288 ret = dtls1_send_hello_verify_request(s); 289 if ( ret <= 0) goto end; 290 s->state=SSL3_ST_SW_FLUSH; 291 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 292 293 /* HelloVerifyRequests resets Finished MAC */ 294 if (s->client_version != DTLS1_BAD_VER) 295 ssl3_init_finished_mac(s); 296 break; 297 298 case SSL3_ST_SW_SRVR_HELLO_A: 299 case SSL3_ST_SW_SRVR_HELLO_B: 300 s->new_session = 2; 301 dtls1_start_timer(s); 302 ret=dtls1_send_server_hello(s); 303 if (ret <= 0) goto end; 304 305 #ifndef OPENSSL_NO_TLSEXT 306 if (s->hit) 307 { 308 if (s->tlsext_ticket_expected) 309 s->state=SSL3_ST_SW_SESSION_TICKET_A; 310 else 311 s->state=SSL3_ST_SW_CHANGE_A; 312 } 313 #else 314 if (s->hit) 315 s->state=SSL3_ST_SW_CHANGE_A; 316 #endif 317 else 318 s->state=SSL3_ST_SW_CERT_A; 319 s->init_num=0; 320 break; 321 322 case SSL3_ST_SW_CERT_A: 323 case SSL3_ST_SW_CERT_B: 324 /* Check if it is anon DH */ 325 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) 326 { 327 dtls1_start_timer(s); 328 ret=dtls1_send_server_certificate(s); 329 if (ret <= 0) goto end; 330 #ifndef OPENSSL_NO_TLSEXT 331 if (s->tlsext_status_expected) 332 s->state=SSL3_ST_SW_CERT_STATUS_A; 333 else 334 s->state=SSL3_ST_SW_KEY_EXCH_A; 335 } 336 else 337 { 338 skip = 1; 339 s->state=SSL3_ST_SW_KEY_EXCH_A; 340 } 341 #else 342 } 343 else 344 skip=1; 345 346 s->state=SSL3_ST_SW_KEY_EXCH_A; 347 #endif 348 s->init_num=0; 349 break; 350 351 case SSL3_ST_SW_KEY_EXCH_A: 352 case SSL3_ST_SW_KEY_EXCH_B: 353 l=s->s3->tmp.new_cipher->algorithms; 354 355 /* clear this, it may get reset by 356 * send_server_key_exchange */ 357 if ((s->options & SSL_OP_EPHEMERAL_RSA) 358 #ifndef OPENSSL_NO_KRB5 359 && !(l & SSL_KRB5) 360 #endif /* OPENSSL_NO_KRB5 */ 361 ) 362 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key 363 * even when forbidden by protocol specs 364 * (handshake may fail as clients are not required to 365 * be able to handle this) */ 366 s->s3->tmp.use_rsa_tmp=1; 367 else 368 s->s3->tmp.use_rsa_tmp=0; 369 370 /* only send if a DH key exchange, fortezza or 371 * RSA but we have a sign only certificate */ 372 if (s->s3->tmp.use_rsa_tmp 373 || (l & (SSL_DH|SSL_kFZA)) 374 || ((l & SSL_kRSA) 375 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 376 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 377 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 378 ) 379 ) 380 ) 381 ) 382 { 383 dtls1_start_timer(s); 384 ret=dtls1_send_server_key_exchange(s); 385 if (ret <= 0) goto end; 386 } 387 else 388 skip=1; 389 390 s->state=SSL3_ST_SW_CERT_REQ_A; 391 s->init_num=0; 392 break; 393 394 case SSL3_ST_SW_CERT_REQ_A: 395 case SSL3_ST_SW_CERT_REQ_B: 396 if (/* don't request cert unless asked for it: */ 397 !(s->verify_mode & SSL_VERIFY_PEER) || 398 /* if SSL_VERIFY_CLIENT_ONCE is set, 399 * don't request cert during re-negotiation: */ 400 ((s->session->peer != NULL) && 401 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 402 /* never request cert in anonymous ciphersuites 403 * (see section "Certificate request" in SSL 3 drafts 404 * and in RFC 2246): */ 405 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) && 406 /* ... except when the application insists on verification 407 * (against the specs, but s3_clnt.c accepts this for SSL 3) */ 408 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 409 /* never request cert in Kerberos ciphersuites */ 410 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5)) 411 { 412 /* no cert request */ 413 skip=1; 414 s->s3->tmp.cert_request=0; 415 s->state=SSL3_ST_SW_SRVR_DONE_A; 416 } 417 else 418 { 419 s->s3->tmp.cert_request=1; 420 dtls1_start_timer(s); 421 ret=dtls1_send_certificate_request(s); 422 if (ret <= 0) goto end; 423 #ifndef NETSCAPE_HANG_BUG 424 s->state=SSL3_ST_SW_SRVR_DONE_A; 425 #else 426 s->state=SSL3_ST_SW_FLUSH; 427 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 428 #endif 429 s->init_num=0; 430 } 431 break; 432 433 case SSL3_ST_SW_SRVR_DONE_A: 434 case SSL3_ST_SW_SRVR_DONE_B: 435 dtls1_start_timer(s); 436 ret=dtls1_send_server_done(s); 437 if (ret <= 0) goto end; 438 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 439 s->state=SSL3_ST_SW_FLUSH; 440 s->init_num=0; 441 break; 442 443 case SSL3_ST_SW_FLUSH: 444 s->rwstate=SSL_WRITING; 445 if (BIO_flush(s->wbio) <= 0) 446 { 447 ret= -1; 448 goto end; 449 } 450 s->rwstate=SSL_NOTHING; 451 s->state=s->s3->tmp.next_state; 452 break; 453 454 case SSL3_ST_SR_CERT_A: 455 case SSL3_ST_SR_CERT_B: 456 /* Check for second client hello (MS SGC) */ 457 ret = ssl3_check_client_hello(s); 458 if (ret <= 0) 459 goto end; 460 dtls1_stop_timer(s); 461 if (ret == 2) 462 s->state = SSL3_ST_SR_CLNT_HELLO_C; 463 else { 464 /* could be sent for a DH cert, even if we 465 * have not asked for it :-) */ 466 ret=ssl3_get_client_certificate(s); 467 if (ret <= 0) goto end; 468 dtls1_stop_timer(s); 469 s->init_num=0; 470 s->state=SSL3_ST_SR_KEY_EXCH_A; 471 } 472 break; 473 474 case SSL3_ST_SR_KEY_EXCH_A: 475 case SSL3_ST_SR_KEY_EXCH_B: 476 ret=ssl3_get_client_key_exchange(s); 477 if (ret <= 0) goto end; 478 dtls1_stop_timer(s); 479 s->state=SSL3_ST_SR_CERT_VRFY_A; 480 s->init_num=0; 481 482 /* We need to get hashes here so if there is 483 * a client cert, it can be verified */ 484 s->method->ssl3_enc->cert_verify_mac(s, 485 &(s->s3->finish_dgst1), 486 &(s->s3->tmp.cert_verify_md[0])); 487 s->method->ssl3_enc->cert_verify_mac(s, 488 &(s->s3->finish_dgst2), 489 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); 490 491 break; 492 493 case SSL3_ST_SR_CERT_VRFY_A: 494 case SSL3_ST_SR_CERT_VRFY_B: 495 496 s->d1->change_cipher_spec_ok = 1; 497 /* we should decide if we expected this one */ 498 ret=ssl3_get_cert_verify(s); 499 if (ret <= 0) goto end; 500 dtls1_stop_timer(s); 501 502 s->state=SSL3_ST_SR_FINISHED_A; 503 s->init_num=0; 504 break; 505 506 case SSL3_ST_SR_FINISHED_A: 507 case SSL3_ST_SR_FINISHED_B: 508 s->d1->change_cipher_spec_ok = 1; 509 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, 510 SSL3_ST_SR_FINISHED_B); 511 if (ret <= 0) goto end; 512 dtls1_stop_timer(s); 513 if (s->hit) 514 s->state=SSL_ST_OK; 515 #ifndef OPENSSL_NO_TLSEXT 516 else if (s->tlsext_ticket_expected) 517 s->state=SSL3_ST_SW_SESSION_TICKET_A; 518 #endif 519 else 520 s->state=SSL3_ST_SW_CHANGE_A; 521 s->init_num=0; 522 break; 523 524 #ifndef OPENSSL_NO_TLSEXT 525 case SSL3_ST_SW_SESSION_TICKET_A: 526 case SSL3_ST_SW_SESSION_TICKET_B: 527 ret=dtls1_send_newsession_ticket(s); 528 if (ret <= 0) goto end; 529 s->state=SSL3_ST_SW_CHANGE_A; 530 s->init_num=0; 531 break; 532 533 case SSL3_ST_SW_CERT_STATUS_A: 534 case SSL3_ST_SW_CERT_STATUS_B: 535 ret=ssl3_send_cert_status(s); 536 if (ret <= 0) goto end; 537 s->state=SSL3_ST_SW_KEY_EXCH_A; 538 s->init_num=0; 539 break; 540 541 #endif 542 543 case SSL3_ST_SW_CHANGE_A: 544 case SSL3_ST_SW_CHANGE_B: 545 546 s->session->cipher=s->s3->tmp.new_cipher; 547 if (!s->method->ssl3_enc->setup_key_block(s)) 548 { ret= -1; goto end; } 549 550 ret=dtls1_send_change_cipher_spec(s, 551 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); 552 553 if (ret <= 0) goto end; 554 s->state=SSL3_ST_SW_FINISHED_A; 555 s->init_num=0; 556 557 if (!s->method->ssl3_enc->change_cipher_state(s, 558 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 559 { 560 ret= -1; 561 goto end; 562 } 563 564 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 565 break; 566 567 case SSL3_ST_SW_FINISHED_A: 568 case SSL3_ST_SW_FINISHED_B: 569 ret=dtls1_send_finished(s, 570 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, 571 s->method->ssl3_enc->server_finished_label, 572 s->method->ssl3_enc->server_finished_label_len); 573 if (ret <= 0) goto end; 574 s->state=SSL3_ST_SW_FLUSH; 575 if (s->hit) 576 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; 577 else 578 s->s3->tmp.next_state=SSL_ST_OK; 579 s->init_num=0; 580 break; 581 582 case SSL_ST_OK: 583 /* clean a few things up */ 584 ssl3_cleanup_key_block(s); 585 586 #if 0 587 BUF_MEM_free(s->init_buf); 588 s->init_buf=NULL; 589 #endif 590 591 /* remove buffering on output */ 592 ssl_free_wbio_buffer(s); 593 594 s->init_num=0; 595 596 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */ 597 { 598 /* actually not necessarily a 'new' session unless 599 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */ 600 601 s->new_session=0; 602 603 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 604 605 s->ctx->stats.sess_accept_good++; 606 /* s->server=1; */ 607 s->handshake_func=dtls1_accept; 608 609 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 610 } 611 612 ret = 1; 613 614 /* done handshaking, next message is client hello */ 615 s->d1->handshake_read_seq = 0; 616 /* next message is server hello */ 617 s->d1->handshake_write_seq = 0; 618 s->d1->next_handshake_write_seq = 0; 619 goto end; 620 /* break; */ 621 622 default: 623 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); 624 ret= -1; 625 goto end; 626 /* break; */ 627 } 628 629 if (!s->s3->tmp.reuse_message && !skip) 630 { 631 if (s->debug) 632 { 633 if ((ret=BIO_flush(s->wbio)) <= 0) 634 goto end; 635 } 636 637 638 if ((cb != NULL) && (s->state != state)) 639 { 640 new_state=s->state; 641 s->state=state; 642 cb(s,SSL_CB_ACCEPT_LOOP,1); 643 s->state=new_state; 644 } 645 } 646 skip=0; 647 } 648 end: 649 /* BIO_flush(s->wbio); */ 650 651 s->in_handshake--; 652 if (cb != NULL) 653 cb(s,SSL_CB_ACCEPT_EXIT,ret); 654 return(ret); 655 } 656 657 int dtls1_send_hello_request(SSL *s) 658 { 659 unsigned char *p; 660 661 if (s->state == SSL3_ST_SW_HELLO_REQ_A) 662 { 663 p=(unsigned char *)s->init_buf->data; 664 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 665 666 s->state=SSL3_ST_SW_HELLO_REQ_B; 667 /* number of bytes to write */ 668 s->init_num=DTLS1_HM_HEADER_LENGTH; 669 s->init_off=0; 670 671 /* no need to buffer this message, since there are no retransmit 672 * requests for it */ 673 } 674 675 /* SSL3_ST_SW_HELLO_REQ_B */ 676 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 677 } 678 679 int dtls1_send_hello_verify_request(SSL *s) 680 { 681 unsigned int msg_len; 682 unsigned char *msg, *buf, *p; 683 684 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) 685 { 686 buf = (unsigned char *)s->init_buf->data; 687 688 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 689 if (s->client_version == DTLS1_BAD_VER) 690 *(p++) = DTLS1_BAD_VER>>8, 691 *(p++) = DTLS1_BAD_VER&0xff; 692 else 693 *(p++) = s->version >> 8, 694 *(p++) = s->version & 0xFF; 695 696 if (s->ctx->app_gen_cookie_cb == NULL || 697 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 698 &(s->d1->cookie_len)) == 0) 699 { 700 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); 701 return 0; 702 } 703 704 *(p++) = (unsigned char) s->d1->cookie_len; 705 memcpy(p, s->d1->cookie, s->d1->cookie_len); 706 p += s->d1->cookie_len; 707 msg_len = p - msg; 708 709 dtls1_set_message_header(s, buf, 710 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); 711 712 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 713 /* number of bytes to write */ 714 s->init_num=p-buf; 715 s->init_off=0; 716 717 /* buffer the message to handle re-xmits */ 718 dtls1_buffer_message(s, 0); 719 } 720 721 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 722 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 723 } 724 725 int dtls1_send_server_hello(SSL *s) 726 { 727 unsigned char *buf; 728 unsigned char *p,*d; 729 int i; 730 unsigned int sl; 731 unsigned long l,Time; 732 733 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) 734 { 735 buf=(unsigned char *)s->init_buf->data; 736 p=s->s3->server_random; 737 Time=(unsigned long)time(NULL); /* Time */ 738 l2n(Time,p); 739 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time)); 740 /* Do the message type and length last */ 741 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 742 743 if (s->client_version == DTLS1_BAD_VER) 744 *(p++)=DTLS1_BAD_VER>>8, 745 *(p++)=DTLS1_BAD_VER&0xff; 746 else 747 *(p++)=s->version>>8, 748 *(p++)=s->version&0xff; 749 750 /* Random stuff */ 751 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 752 p+=SSL3_RANDOM_SIZE; 753 754 /* now in theory we have 3 options to sending back the 755 * session id. If it is a re-use, we send back the 756 * old session-id, if it is a new session, we send 757 * back the new session-id or we send back a 0 length 758 * session-id if we want it to be single use. 759 * Currently I will not implement the '0' length session-id 760 * 12-Jan-98 - I'll now support the '0' length stuff. 761 */ 762 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 763 s->session->session_id_length=0; 764 765 sl=s->session->session_id_length; 766 if (sl > sizeof s->session->session_id) 767 { 768 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 769 return -1; 770 } 771 *(p++)=sl; 772 memcpy(p,s->session->session_id,sl); 773 p+=sl; 774 775 /* put the cipher */ 776 if (s->s3->tmp.new_cipher == NULL) 777 return -1; 778 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); 779 p+=i; 780 781 /* put the compression method */ 782 #ifdef OPENSSL_NO_COMP 783 *(p++)=0; 784 #else 785 if (s->s3->tmp.new_compression == NULL) 786 *(p++)=0; 787 else 788 *(p++)=s->s3->tmp.new_compression->id; 789 #endif 790 791 #ifndef OPENSSL_NO_TLSEXT 792 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 793 { 794 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR); 795 return -1; 796 } 797 #endif 798 799 /* do the header */ 800 l=(p-d); 801 d=buf; 802 803 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 804 805 s->state=SSL3_ST_SW_SRVR_HELLO_B; 806 /* number of bytes to write */ 807 s->init_num=p-buf; 808 s->init_off=0; 809 810 /* buffer the message to handle re-xmits */ 811 dtls1_buffer_message(s, 0); 812 } 813 814 /* SSL3_ST_SW_SRVR_HELLO_B */ 815 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 816 } 817 818 int dtls1_send_server_done(SSL *s) 819 { 820 unsigned char *p; 821 822 if (s->state == SSL3_ST_SW_SRVR_DONE_A) 823 { 824 p=(unsigned char *)s->init_buf->data; 825 826 /* do the header */ 827 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 828 829 s->state=SSL3_ST_SW_SRVR_DONE_B; 830 /* number of bytes to write */ 831 s->init_num=DTLS1_HM_HEADER_LENGTH; 832 s->init_off=0; 833 834 /* buffer the message to handle re-xmits */ 835 dtls1_buffer_message(s, 0); 836 } 837 838 /* SSL3_ST_SW_SRVR_DONE_B */ 839 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 840 } 841 842 int dtls1_send_server_key_exchange(SSL *s) 843 { 844 #ifndef OPENSSL_NO_RSA 845 unsigned char *q; 846 int j,num; 847 RSA *rsa; 848 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 849 unsigned int u; 850 #endif 851 #ifndef OPENSSL_NO_DH 852 DH *dh=NULL,*dhp; 853 #endif 854 EVP_PKEY *pkey; 855 unsigned char *p,*d; 856 int al,i; 857 unsigned long type; 858 int n; 859 CERT *cert; 860 BIGNUM *r[4]; 861 int nr[4],kn; 862 BUF_MEM *buf; 863 EVP_MD_CTX md_ctx; 864 865 EVP_MD_CTX_init(&md_ctx); 866 if (s->state == SSL3_ST_SW_KEY_EXCH_A) 867 { 868 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK; 869 cert=s->cert; 870 871 buf=s->init_buf; 872 873 r[0]=r[1]=r[2]=r[3]=NULL; 874 n=0; 875 #ifndef OPENSSL_NO_RSA 876 if (type & SSL_kRSA) 877 { 878 rsa=cert->rsa_tmp; 879 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) 880 { 881 rsa=s->cert->rsa_tmp_cb(s, 882 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 883 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 884 if(rsa == NULL) 885 { 886 al=SSL_AD_HANDSHAKE_FAILURE; 887 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 888 goto f_err; 889 } 890 RSA_up_ref(rsa); 891 cert->rsa_tmp=rsa; 892 } 893 if (rsa == NULL) 894 { 895 al=SSL_AD_HANDSHAKE_FAILURE; 896 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); 897 goto f_err; 898 } 899 r[0]=rsa->n; 900 r[1]=rsa->e; 901 s->s3->tmp.use_rsa_tmp=1; 902 } 903 else 904 #endif 905 #ifndef OPENSSL_NO_DH 906 if (type & SSL_kEDH) 907 { 908 dhp=cert->dh_tmp; 909 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 910 dhp=s->cert->dh_tmp_cb(s, 911 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 912 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 913 if (dhp == NULL) 914 { 915 al=SSL_AD_HANDSHAKE_FAILURE; 916 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 917 goto f_err; 918 } 919 920 if (s->s3->tmp.dh != NULL) 921 { 922 DH_free(dh); 923 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 924 goto err; 925 } 926 927 if ((dh=DHparams_dup(dhp)) == NULL) 928 { 929 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 930 goto err; 931 } 932 933 s->s3->tmp.dh=dh; 934 if ((dhp->pub_key == NULL || 935 dhp->priv_key == NULL || 936 (s->options & SSL_OP_SINGLE_DH_USE))) 937 { 938 if(!DH_generate_key(dh)) 939 { 940 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 941 ERR_R_DH_LIB); 942 goto err; 943 } 944 } 945 else 946 { 947 dh->pub_key=BN_dup(dhp->pub_key); 948 dh->priv_key=BN_dup(dhp->priv_key); 949 if ((dh->pub_key == NULL) || 950 (dh->priv_key == NULL)) 951 { 952 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 953 goto err; 954 } 955 } 956 r[0]=dh->p; 957 r[1]=dh->g; 958 r[2]=dh->pub_key; 959 } 960 else 961 #endif 962 { 963 al=SSL_AD_HANDSHAKE_FAILURE; 964 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 965 goto f_err; 966 } 967 for (i=0; r[i] != NULL; i++) 968 { 969 nr[i]=BN_num_bytes(r[i]); 970 n+=2+nr[i]; 971 } 972 973 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)) 974 { 975 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher)) 976 == NULL) 977 { 978 al=SSL_AD_DECODE_ERROR; 979 goto f_err; 980 } 981 kn=EVP_PKEY_size(pkey); 982 } 983 else 984 { 985 pkey=NULL; 986 kn=0; 987 } 988 989 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) 990 { 991 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); 992 goto err; 993 } 994 d=(unsigned char *)s->init_buf->data; 995 p= &(d[DTLS1_HM_HEADER_LENGTH]); 996 997 for (i=0; r[i] != NULL; i++) 998 { 999 s2n(nr[i],p); 1000 BN_bn2bin(r[i],p); 1001 p+=nr[i]; 1002 } 1003 1004 /* not anonymous */ 1005 if (pkey != NULL) 1006 { 1007 /* n is the length of the params, they start at 1008 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space 1009 * at the end. */ 1010 #ifndef OPENSSL_NO_RSA 1011 if (pkey->type == EVP_PKEY_RSA) 1012 { 1013 q=md_buf; 1014 j=0; 1015 for (num=2; num > 0; num--) 1016 { 1017 EVP_DigestInit_ex(&md_ctx,(num == 2) 1018 ?s->ctx->md5:s->ctx->sha1, NULL); 1019 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1020 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1021 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1022 EVP_DigestFinal_ex(&md_ctx,q, 1023 (unsigned int *)&i); 1024 q+=i; 1025 j+=i; 1026 } 1027 if (RSA_sign(NID_md5_sha1, md_buf, j, 1028 &(p[2]), &u, pkey->pkey.rsa) <= 0) 1029 { 1030 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); 1031 goto err; 1032 } 1033 s2n(u,p); 1034 n+=u+2; 1035 } 1036 else 1037 #endif 1038 #if !defined(OPENSSL_NO_DSA) 1039 if (pkey->type == EVP_PKEY_DSA) 1040 { 1041 /* lets do DSS */ 1042 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); 1043 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1044 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1045 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1046 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1047 (unsigned int *)&i,pkey)) 1048 { 1049 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); 1050 goto err; 1051 } 1052 s2n(i,p); 1053 n+=i+2; 1054 } 1055 else 1056 #endif 1057 { 1058 /* Is this error check actually needed? */ 1059 al=SSL_AD_HANDSHAKE_FAILURE; 1060 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); 1061 goto f_err; 1062 } 1063 } 1064 1065 d = dtls1_set_message_header(s, d, 1066 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1067 1068 /* we should now have things packed up, so lets send 1069 * it off */ 1070 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1071 s->init_off=0; 1072 1073 /* buffer the message to handle re-xmits */ 1074 dtls1_buffer_message(s, 0); 1075 } 1076 1077 s->state = SSL3_ST_SW_KEY_EXCH_B; 1078 EVP_MD_CTX_cleanup(&md_ctx); 1079 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1080 f_err: 1081 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1082 err: 1083 EVP_MD_CTX_cleanup(&md_ctx); 1084 return(-1); 1085 } 1086 1087 int dtls1_send_certificate_request(SSL *s) 1088 { 1089 unsigned char *p,*d; 1090 int i,j,nl,off,n; 1091 STACK_OF(X509_NAME) *sk=NULL; 1092 X509_NAME *name; 1093 BUF_MEM *buf; 1094 unsigned int msg_len; 1095 1096 if (s->state == SSL3_ST_SW_CERT_REQ_A) 1097 { 1098 buf=s->init_buf; 1099 1100 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1101 1102 /* get the list of acceptable cert types */ 1103 p++; 1104 n=ssl3_get_req_cert_type(s,p); 1105 d[0]=n; 1106 p+=n; 1107 n++; 1108 1109 off=n; 1110 p+=2; 1111 n+=2; 1112 1113 sk=SSL_get_client_CA_list(s); 1114 nl=0; 1115 if (sk != NULL) 1116 { 1117 for (i=0; i<sk_X509_NAME_num(sk); i++) 1118 { 1119 name=sk_X509_NAME_value(sk,i); 1120 j=i2d_X509_NAME(name,NULL); 1121 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2)) 1122 { 1123 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); 1124 goto err; 1125 } 1126 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]); 1127 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 1128 { 1129 s2n(j,p); 1130 i2d_X509_NAME(name,&p); 1131 n+=2+j; 1132 nl+=2+j; 1133 } 1134 else 1135 { 1136 d=p; 1137 i2d_X509_NAME(name,&p); 1138 j-=2; s2n(j,d); j+=2; 1139 n+=j; 1140 nl+=j; 1141 } 1142 } 1143 } 1144 /* else no CA names */ 1145 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); 1146 s2n(nl,p); 1147 1148 d=(unsigned char *)buf->data; 1149 *(d++)=SSL3_MT_CERTIFICATE_REQUEST; 1150 l2n3(n,d); 1151 s2n(s->d1->handshake_write_seq,d); 1152 s->d1->handshake_write_seq++; 1153 1154 /* we should now have things packed up, so lets send 1155 * it off */ 1156 1157 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1158 s->init_off=0; 1159 #ifdef NETSCAPE_HANG_BUG 1160 /* XXX: what to do about this? */ 1161 p=(unsigned char *)s->init_buf->data + s->init_num; 1162 1163 /* do the header */ 1164 *(p++)=SSL3_MT_SERVER_DONE; 1165 *(p++)=0; 1166 *(p++)=0; 1167 *(p++)=0; 1168 s->init_num += 4; 1169 #endif 1170 1171 /* XDTLS: set message header ? */ 1172 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1173 dtls1_set_message_header(s, (void *)s->init_buf->data, 1174 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); 1175 1176 /* buffer the message to handle re-xmits */ 1177 dtls1_buffer_message(s, 0); 1178 1179 s->state = SSL3_ST_SW_CERT_REQ_B; 1180 } 1181 1182 /* SSL3_ST_SW_CERT_REQ_B */ 1183 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1184 err: 1185 return(-1); 1186 } 1187 1188 int dtls1_send_server_certificate(SSL *s) 1189 { 1190 unsigned long l; 1191 X509 *x; 1192 1193 if (s->state == SSL3_ST_SW_CERT_A) 1194 { 1195 x=ssl_get_server_send_cert(s); 1196 if (x == NULL && 1197 /* VRS: allow null cert if auth == KRB5 */ 1198 (s->s3->tmp.new_cipher->algorithms 1199 & (SSL_MKEY_MASK|SSL_AUTH_MASK)) 1200 != (SSL_aKRB5|SSL_kKRB5)) 1201 { 1202 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1203 return(0); 1204 } 1205 1206 l=dtls1_output_cert_chain(s,x); 1207 s->state=SSL3_ST_SW_CERT_B; 1208 s->init_num=(int)l; 1209 s->init_off=0; 1210 1211 /* buffer the message to handle re-xmits */ 1212 dtls1_buffer_message(s, 0); 1213 } 1214 1215 /* SSL3_ST_SW_CERT_B */ 1216 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1217 } 1218 1219 #ifndef OPENSSL_NO_TLSEXT 1220 int dtls1_send_newsession_ticket(SSL *s) 1221 { 1222 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) 1223 { 1224 unsigned char *p, *senc, *macstart; 1225 int len, slen; 1226 unsigned int hlen, msg_len; 1227 EVP_CIPHER_CTX ctx; 1228 HMAC_CTX hctx; 1229 SSL_CTX *tctx = s->initial_ctx; 1230 unsigned char iv[EVP_MAX_IV_LENGTH]; 1231 unsigned char key_name[16]; 1232 1233 /* get session encoding length */ 1234 slen = i2d_SSL_SESSION(s->session, NULL); 1235 /* Some length values are 16 bits, so forget it if session is 1236 * too long 1237 */ 1238 if (slen > 0xFF00) 1239 return -1; 1240 /* Grow buffer if need be: the length calculation is as 1241 * follows 12 (DTLS handshake message header) + 1242 * 4 (ticket lifetime hint) + 2 (ticket length) + 1243 * 16 (key name) + max_iv_len (iv length) + 1244 * session_length + max_enc_block_size (max encrypted session 1245 * length) + max_md_size (HMAC). 1246 */ 1247 if (!BUF_MEM_grow(s->init_buf, 1248 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1249 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1250 return -1; 1251 senc = OPENSSL_malloc(slen); 1252 if (!senc) 1253 return -1; 1254 p = senc; 1255 i2d_SSL_SESSION(s->session, &p); 1256 1257 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1258 EVP_CIPHER_CTX_init(&ctx); 1259 HMAC_CTX_init(&hctx); 1260 /* Initialize HMAC and cipher contexts. If callback present 1261 * it does all the work otherwise use generated values 1262 * from parent ctx. 1263 */ 1264 if (tctx->tlsext_ticket_key_cb) 1265 { 1266 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1267 &hctx, 1) < 0) 1268 { 1269 OPENSSL_free(senc); 1270 return -1; 1271 } 1272 } 1273 else 1274 { 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, msg_len); 1321 1322 /* buffer the message to handle re-xmits */ 1323 dtls1_buffer_message(s, 0); 1324 } 1325 1326 /* SSL3_ST_SW_SESSION_TICKET_B */ 1327 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1328 } 1329 #endif 1330
