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) 1999-2007 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#include <openssl/bn.h> 125#ifndef OPENSSL_NO_DH 126#include <openssl/dh.h> 127#endif 128 129static const SSL_METHOD *dtls1_get_server_method(int ver); 130static int dtls1_send_hello_verify_request(SSL *s); 131 132static const SSL_METHOD *dtls1_get_server_method(int ver) 133 { 134 if (ver == DTLS1_VERSION) 135 return(DTLSv1_server_method()); 136 else 137 return(NULL); 138 } 139 140IMPLEMENT_dtls1_meth_func(DTLSv1_server_method, 141 dtls1_accept, 142 ssl_undefined_function, 143 dtls1_get_server_method) 144 145int dtls1_accept(SSL *s) 146 { 147 BUF_MEM *buf; 148 unsigned long Time=(unsigned long)time(NULL); 149 void (*cb)(const SSL *ssl,int type,int val)=NULL; 150 unsigned long alg_k; 151 int ret= -1; 152 int new_state,state,skip=0; 153 int listen; 154 155 RAND_add(&Time,sizeof(Time),0); 156 ERR_clear_error(); 157 clear_sys_error(); 158 159 if (s->info_callback != NULL) 160 cb=s->info_callback; 161 else if (s->ctx->info_callback != NULL) 162 cb=s->ctx->info_callback; 163 164 listen = s->d1->listen; 165 166 /* init things to blank */ 167 s->in_handshake++; 168 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 169 170 s->d1->listen = listen; 171 172 if (s->cert == NULL) 173 { 174 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET); 175 return(-1); 176 } 177 178 for (;;) 179 { 180 state=s->state; 181 182 switch (s->state) 183 { 184 case SSL_ST_RENEGOTIATE: 185 s->new_session=1; 186 /* s->state=SSL_ST_ACCEPT; */ 187 188 case SSL_ST_BEFORE: 189 case SSL_ST_ACCEPT: 190 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 191 case SSL_ST_OK|SSL_ST_ACCEPT: 192 193 s->server=1; 194 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 195 196 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) 197 { 198 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 199 return -1; 200 } 201 s->type=SSL_ST_ACCEPT; 202 203 if (s->init_buf == NULL) 204 { 205 if ((buf=BUF_MEM_new()) == NULL) 206 { 207 ret= -1; 208 goto end; 209 } 210 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 211 { 212 BUF_MEM_free(buf); 213 ret= -1; 214 goto end; 215 } 216 s->init_buf=buf; 217 } 218 219 if (!ssl3_setup_buffers(s)) 220 { 221 ret= -1; 222 goto end; 223 } 224 225 s->init_num=0; 226 227 if (s->state != SSL_ST_RENEGOTIATE) 228 { 229 /* Ok, we now need to push on a buffering BIO so that 230 * the output is sent in a way that TCP likes :-) 231 */ 232 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } 233 234 ssl3_init_finished_mac(s); 235 s->state=SSL3_ST_SR_CLNT_HELLO_A; 236 s->ctx->stats.sess_accept++; 237 } 238 else 239 { 240 /* s->state == SSL_ST_RENEGOTIATE, 241 * we will just send a HelloRequest */ 242 s->ctx->stats.sess_accept_renegotiate++; 243 s->state=SSL3_ST_SW_HELLO_REQ_A; 244 } 245 246 break; 247 248 case SSL3_ST_SW_HELLO_REQ_A: 249 case SSL3_ST_SW_HELLO_REQ_B: 250 251 s->shutdown=0; 252 dtls1_clear_record_buffer(s); 253 dtls1_start_timer(s); 254 ret=dtls1_send_hello_request(s); 255 if (ret <= 0) goto end; 256 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 257 s->state=SSL3_ST_SW_FLUSH; 258 s->init_num=0; 259 260 ssl3_init_finished_mac(s); 261 break; 262 263 case SSL3_ST_SW_HELLO_REQ_C: 264 s->state=SSL_ST_OK; 265 break; 266 267 case SSL3_ST_SR_CLNT_HELLO_A: 268 case SSL3_ST_SR_CLNT_HELLO_B: 269 case SSL3_ST_SR_CLNT_HELLO_C: 270 271 s->shutdown=0; 272 ret=ssl3_get_client_hello(s); 273 if (ret <= 0) goto end; 274 dtls1_stop_timer(s); 275 276 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 277 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 278 else 279 s->state = SSL3_ST_SW_SRVR_HELLO_A; 280 281 s->init_num=0; 282 283 /* Reflect ClientHello sequence to remain stateless while listening */ 284 if (listen) 285 { 286 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence)); 287 } 288 289 /* If we're just listening, stop here */ 290 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) 291 { 292 ret = 2; 293 s->d1->listen = 0; 294 /* Set expected sequence numbers 295 * to continue the handshake. 296 */ 297 s->d1->handshake_read_seq = 2; 298 s->d1->handshake_write_seq = 1; 299 s->d1->next_handshake_write_seq = 1; 300 goto end; 301 } 302 303 break; 304 305 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 306 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 307 308 ret = dtls1_send_hello_verify_request(s); 309 if ( ret <= 0) goto end; 310 s->state=SSL3_ST_SW_FLUSH; 311 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 312 313 /* HelloVerifyRequest resets Finished MAC */ 314 if (s->version != DTLS1_BAD_VER) 315 ssl3_init_finished_mac(s); 316 break; 317 318 case SSL3_ST_SW_SRVR_HELLO_A: 319 case SSL3_ST_SW_SRVR_HELLO_B: 320 s->new_session = 2; 321 dtls1_start_timer(s); 322 ret=dtls1_send_server_hello(s); 323 if (ret <= 0) goto end; 324 325#ifndef OPENSSL_NO_TLSEXT 326 if (s->hit) 327 { 328 if (s->tlsext_ticket_expected) 329 s->state=SSL3_ST_SW_SESSION_TICKET_A; 330 else 331 s->state=SSL3_ST_SW_CHANGE_A; 332 } 333#else 334 if (s->hit) 335 s->state=SSL3_ST_SW_CHANGE_A; 336#endif 337 else 338 s->state=SSL3_ST_SW_CERT_A; 339 s->init_num=0; 340 break; 341 342 case SSL3_ST_SW_CERT_A: 343 case SSL3_ST_SW_CERT_B: 344 /* Check if it is anon DH or normal PSK */ 345 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 346 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 347 { 348 dtls1_start_timer(s); 349 ret=dtls1_send_server_certificate(s); 350 if (ret <= 0) goto end; 351#ifndef OPENSSL_NO_TLSEXT 352 if (s->tlsext_status_expected) 353 s->state=SSL3_ST_SW_CERT_STATUS_A; 354 else 355 s->state=SSL3_ST_SW_KEY_EXCH_A; 356 } 357 else 358 { 359 skip = 1; 360 s->state=SSL3_ST_SW_KEY_EXCH_A; 361 } 362#else 363 } 364 else 365 skip=1; 366 367 s->state=SSL3_ST_SW_KEY_EXCH_A; 368#endif 369 s->init_num=0; 370 break; 371 372 case SSL3_ST_SW_KEY_EXCH_A: 373 case SSL3_ST_SW_KEY_EXCH_B: 374 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 375 376 /* 377 * clear this, it may get reset by 378 * send_server_key_exchange 379 */ 380 s->s3->tmp.use_rsa_tmp=0; 381 382 /* only send if a DH key exchange or 383 * RSA but we have a sign only certificate */ 384 if (0 385 /* PSK: send ServerKeyExchange if PSK identity 386 * hint if provided */ 387#ifndef OPENSSL_NO_PSK 388 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) 389#endif 390 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 391 || (alg_k & SSL_kEECDH) 392 || ((alg_k & SSL_kRSA) 393 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 394 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 395 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 396 ) 397 ) 398 ) 399 ) 400 { 401 dtls1_start_timer(s); 402 ret=dtls1_send_server_key_exchange(s); 403 if (ret <= 0) goto end; 404 } 405 else 406 skip=1; 407 408 s->state=SSL3_ST_SW_CERT_REQ_A; 409 s->init_num=0; 410 break; 411 412 case SSL3_ST_SW_CERT_REQ_A: 413 case SSL3_ST_SW_CERT_REQ_B: 414 if (/* don't request cert unless asked for it: */ 415 !(s->verify_mode & SSL_VERIFY_PEER) || 416 /* if SSL_VERIFY_CLIENT_ONCE is set, 417 * don't request cert during re-negotiation: */ 418 ((s->session->peer != NULL) && 419 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 420 /* never request cert in anonymous ciphersuites 421 * (see section "Certificate request" in SSL 3 drafts 422 * and in RFC 2246): */ 423 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 424 /* ... except when the application insists on verification 425 * (against the specs, but s3_clnt.c accepts this for SSL 3) */ 426 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 427 /* never request cert in Kerberos ciphersuites */ 428 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 429 /* With normal PSK Certificates and 430 * Certificate Requests are omitted */ 431 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 432 { 433 /* no cert request */ 434 skip=1; 435 s->s3->tmp.cert_request=0; 436 s->state=SSL3_ST_SW_SRVR_DONE_A; 437 } 438 else 439 { 440 s->s3->tmp.cert_request=1; 441 dtls1_start_timer(s); 442 ret=dtls1_send_certificate_request(s); 443 if (ret <= 0) goto end; 444#ifndef NETSCAPE_HANG_BUG 445 s->state=SSL3_ST_SW_SRVR_DONE_A; 446#else 447 s->state=SSL3_ST_SW_FLUSH; 448 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 449#endif 450 s->init_num=0; 451 } 452 break; 453 454 case SSL3_ST_SW_SRVR_DONE_A: 455 case SSL3_ST_SW_SRVR_DONE_B: 456 dtls1_start_timer(s); 457 ret=dtls1_send_server_done(s); 458 if (ret <= 0) goto end; 459 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 460 s->state=SSL3_ST_SW_FLUSH; 461 s->init_num=0; 462 break; 463 464 case SSL3_ST_SW_FLUSH: 465 s->rwstate=SSL_WRITING; 466 if (BIO_flush(s->wbio) <= 0) 467 { 468 ret= -1; 469 goto end; 470 } 471 s->rwstate=SSL_NOTHING; 472 s->state=s->s3->tmp.next_state; 473 break; 474 475 case SSL3_ST_SR_CERT_A: 476 case SSL3_ST_SR_CERT_B: 477 /* Check for second client hello (MS SGC) */ 478 ret = ssl3_check_client_hello(s); 479 if (ret <= 0) 480 goto end; 481 if (ret == 2) 482 { 483 dtls1_stop_timer(s); 484 s->state = SSL3_ST_SR_CLNT_HELLO_C; 485 } 486 else { 487 if (s->s3->tmp.cert_request) 488 { 489 ret=ssl3_get_client_certificate(s); 490 if (ret <= 0) goto end; 491 } 492 s->init_num=0; 493 s->state=SSL3_ST_SR_KEY_EXCH_A; 494 } 495 break; 496 497 case SSL3_ST_SR_KEY_EXCH_A: 498 case SSL3_ST_SR_KEY_EXCH_B: 499 ret=ssl3_get_client_key_exchange(s); 500 if (ret <= 0) goto end; 501 s->state=SSL3_ST_SR_CERT_VRFY_A; 502 s->init_num=0; 503 504 if (ret == 2) 505 { 506 /* For the ECDH ciphersuites when 507 * the client sends its ECDH pub key in 508 * a certificate, the CertificateVerify 509 * message is not sent. 510 */ 511 s->state=SSL3_ST_SR_FINISHED_A; 512 s->init_num = 0; 513 } 514 else 515 { 516 s->state=SSL3_ST_SR_CERT_VRFY_A; 517 s->init_num=0; 518 519 /* We need to get hashes here so if there is 520 * a client cert, it can be verified */ 521 s->method->ssl3_enc->cert_verify_mac(s, 522 NID_md5, 523 &(s->s3->tmp.cert_verify_md[0])); 524 s->method->ssl3_enc->cert_verify_mac(s, 525 NID_sha1, 526 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); 527 } 528 break; 529 530 case SSL3_ST_SR_CERT_VRFY_A: 531 case SSL3_ST_SR_CERT_VRFY_B: 532 533 s->d1->change_cipher_spec_ok = 1; 534 /* we should decide if we expected this one */ 535 ret=ssl3_get_cert_verify(s); 536 if (ret <= 0) goto end; 537 538 s->state=SSL3_ST_SR_FINISHED_A; 539 s->init_num=0; 540 break; 541 542 case SSL3_ST_SR_FINISHED_A: 543 case SSL3_ST_SR_FINISHED_B: 544 s->d1->change_cipher_spec_ok = 1; 545 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, 546 SSL3_ST_SR_FINISHED_B); 547 if (ret <= 0) goto end; 548 dtls1_stop_timer(s); 549 if (s->hit) 550 s->state=SSL_ST_OK; 551#ifndef OPENSSL_NO_TLSEXT 552 else if (s->tlsext_ticket_expected) 553 s->state=SSL3_ST_SW_SESSION_TICKET_A; 554#endif 555 else 556 s->state=SSL3_ST_SW_CHANGE_A; 557 s->init_num=0; 558 break; 559 560#ifndef OPENSSL_NO_TLSEXT 561 case SSL3_ST_SW_SESSION_TICKET_A: 562 case SSL3_ST_SW_SESSION_TICKET_B: 563 ret=dtls1_send_newsession_ticket(s); 564 if (ret <= 0) goto end; 565 s->state=SSL3_ST_SW_CHANGE_A; 566 s->init_num=0; 567 break; 568 569 case SSL3_ST_SW_CERT_STATUS_A: 570 case SSL3_ST_SW_CERT_STATUS_B: 571 ret=ssl3_send_cert_status(s); 572 if (ret <= 0) goto end; 573 s->state=SSL3_ST_SW_KEY_EXCH_A; 574 s->init_num=0; 575 break; 576 577#endif 578 579 case SSL3_ST_SW_CHANGE_A: 580 case SSL3_ST_SW_CHANGE_B: 581 582 s->session->cipher=s->s3->tmp.new_cipher; 583 if (!s->method->ssl3_enc->setup_key_block(s)) 584 { ret= -1; goto end; } 585 586 ret=dtls1_send_change_cipher_spec(s, 587 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); 588 589 if (ret <= 0) goto end; 590 s->state=SSL3_ST_SW_FINISHED_A; 591 s->init_num=0; 592 593 if (!s->method->ssl3_enc->change_cipher_state(s, 594 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 595 { 596 ret= -1; 597 goto end; 598 } 599 600 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 601 break; 602 603 case SSL3_ST_SW_FINISHED_A: 604 case SSL3_ST_SW_FINISHED_B: 605 ret=dtls1_send_finished(s, 606 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, 607 s->method->ssl3_enc->server_finished_label, 608 s->method->ssl3_enc->server_finished_label_len); 609 if (ret <= 0) goto end; 610 s->state=SSL3_ST_SW_FLUSH; 611 if (s->hit) 612 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; 613 else 614 s->s3->tmp.next_state=SSL_ST_OK; 615 s->init_num=0; 616 break; 617 618 case SSL_ST_OK: 619 /* clean a few things up */ 620 ssl3_cleanup_key_block(s); 621 622#if 0 623 BUF_MEM_free(s->init_buf); 624 s->init_buf=NULL; 625#endif 626 627 /* remove buffering on output */ 628 ssl_free_wbio_buffer(s); 629 630 s->init_num=0; 631 632 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */ 633 { 634 /* actually not necessarily a 'new' session unless 635 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */ 636 637 s->new_session=0; 638 639 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 640 641 s->ctx->stats.sess_accept_good++; 642 /* s->server=1; */ 643 s->handshake_func=dtls1_accept; 644 645 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 646 } 647 648 ret = 1; 649 650 /* done handshaking, next message is client hello */ 651 s->d1->handshake_read_seq = 0; 652 /* next message is server hello */ 653 s->d1->handshake_write_seq = 0; 654 s->d1->next_handshake_write_seq = 0; 655 goto end; 656 /* break; */ 657 658 default: 659 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); 660 ret= -1; 661 goto end; 662 /* break; */ 663 } 664 665 if (!s->s3->tmp.reuse_message && !skip) 666 { 667 if (s->debug) 668 { 669 if ((ret=BIO_flush(s->wbio)) <= 0) 670 goto end; 671 } 672 673 674 if ((cb != NULL) && (s->state != state)) 675 { 676 new_state=s->state; 677 s->state=state; 678 cb(s,SSL_CB_ACCEPT_LOOP,1); 679 s->state=new_state; 680 } 681 } 682 skip=0; 683 } 684end: 685 /* BIO_flush(s->wbio); */ 686 687 s->in_handshake--; 688 if (cb != NULL) 689 cb(s,SSL_CB_ACCEPT_EXIT,ret); 690 return(ret); 691 } 692 693int dtls1_send_hello_request(SSL *s) 694 { 695 unsigned char *p; 696 697 if (s->state == SSL3_ST_SW_HELLO_REQ_A) 698 { 699 p=(unsigned char *)s->init_buf->data; 700 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 701 702 s->state=SSL3_ST_SW_HELLO_REQ_B; 703 /* number of bytes to write */ 704 s->init_num=DTLS1_HM_HEADER_LENGTH; 705 s->init_off=0; 706 707 /* no need to buffer this message, since there are no retransmit 708 * requests for it */ 709 } 710 711 /* SSL3_ST_SW_HELLO_REQ_B */ 712 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 713 } 714 715int dtls1_send_hello_verify_request(SSL *s) 716 { 717 unsigned int msg_len; 718 unsigned char *msg, *buf, *p; 719 720 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) 721 { 722 buf = (unsigned char *)s->init_buf->data; 723 724 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 725 *(p++) = s->version >> 8; 726 *(p++) = s->version & 0xFF; 727 728 if (s->ctx->app_gen_cookie_cb == NULL || 729 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 730 &(s->d1->cookie_len)) == 0) 731 { 732 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); 733 return 0; 734 } 735 736 *(p++) = (unsigned char) s->d1->cookie_len; 737 memcpy(p, s->d1->cookie, s->d1->cookie_len); 738 p += s->d1->cookie_len; 739 msg_len = p - msg; 740 741 dtls1_set_message_header(s, buf, 742 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); 743 744 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 745 /* number of bytes to write */ 746 s->init_num=p-buf; 747 s->init_off=0; 748 } 749 750 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 751 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 752 } 753 754int dtls1_send_server_hello(SSL *s) 755 { 756 unsigned char *buf; 757 unsigned char *p,*d; 758 int i; 759 unsigned int sl; 760 unsigned long l,Time; 761 762 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) 763 { 764 buf=(unsigned char *)s->init_buf->data; 765 p=s->s3->server_random; 766 Time=(unsigned long)time(NULL); /* Time */ 767 l2n(Time,p); 768 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4); 769 /* Do the message type and length last */ 770 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 771 772 *(p++)=s->version>>8; 773 *(p++)=s->version&0xff; 774 775 /* Random stuff */ 776 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 777 p+=SSL3_RANDOM_SIZE; 778 779 /* now in theory we have 3 options to sending back the 780 * session id. If it is a re-use, we send back the 781 * old session-id, if it is a new session, we send 782 * back the new session-id or we send back a 0 length 783 * session-id if we want it to be single use. 784 * Currently I will not implement the '0' length session-id 785 * 12-Jan-98 - I'll now support the '0' length stuff. 786 */ 787 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 788 s->session->session_id_length=0; 789 790 sl=s->session->session_id_length; 791 if (sl > sizeof s->session->session_id) 792 { 793 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 794 return -1; 795 } 796 *(p++)=sl; 797 memcpy(p,s->session->session_id,sl); 798 p+=sl; 799 800 /* put the cipher */ 801 if (s->s3->tmp.new_cipher == NULL) 802 return -1; 803 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); 804 p+=i; 805 806 /* put the compression method */ 807#ifdef OPENSSL_NO_COMP 808 *(p++)=0; 809#else 810 if (s->s3->tmp.new_compression == NULL) 811 *(p++)=0; 812 else 813 *(p++)=s->s3->tmp.new_compression->id; 814#endif 815 816#ifndef OPENSSL_NO_TLSEXT 817 if (ssl_prepare_serverhello_tlsext(s) <= 0) 818 { 819 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT); 820 return -1; 821 } 822 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 823 { 824 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR); 825 return -1; 826 } 827#endif 828 829 /* do the header */ 830 l=(p-d); 831 d=buf; 832 833 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 834 835 s->state=SSL3_ST_SW_SRVR_HELLO_B; 836 /* number of bytes to write */ 837 s->init_num=p-buf; 838 s->init_off=0; 839 840 /* buffer the message to handle re-xmits */ 841 dtls1_buffer_message(s, 0); 842 } 843 844 /* SSL3_ST_SW_SRVR_HELLO_B */ 845 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 846 } 847 848int dtls1_send_server_done(SSL *s) 849 { 850 unsigned char *p; 851 852 if (s->state == SSL3_ST_SW_SRVR_DONE_A) 853 { 854 p=(unsigned char *)s->init_buf->data; 855 856 /* do the header */ 857 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 858 859 s->state=SSL3_ST_SW_SRVR_DONE_B; 860 /* number of bytes to write */ 861 s->init_num=DTLS1_HM_HEADER_LENGTH; 862 s->init_off=0; 863 864 /* buffer the message to handle re-xmits */ 865 dtls1_buffer_message(s, 0); 866 } 867 868 /* SSL3_ST_SW_SRVR_DONE_B */ 869 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 870 } 871 872int dtls1_send_server_key_exchange(SSL *s) 873 { 874#ifndef OPENSSL_NO_RSA 875 unsigned char *q; 876 int j,num; 877 RSA *rsa; 878 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 879 unsigned int u; 880#endif 881#ifndef OPENSSL_NO_DH 882 DH *dh=NULL,*dhp; 883#endif 884#ifndef OPENSSL_NO_ECDH 885 EC_KEY *ecdh=NULL, *ecdhp; 886 unsigned char *encodedPoint = NULL; 887 int encodedlen = 0; 888 int curve_id = 0; 889 BN_CTX *bn_ctx = NULL; 890#endif 891 EVP_PKEY *pkey; 892 unsigned char *p,*d; 893 int al,i; 894 unsigned long type; 895 int n; 896 CERT *cert; 897 BIGNUM *r[4]; 898 int nr[4],kn; 899 BUF_MEM *buf; 900 EVP_MD_CTX md_ctx; 901 902 EVP_MD_CTX_init(&md_ctx); 903 if (s->state == SSL3_ST_SW_KEY_EXCH_A) 904 { 905 type=s->s3->tmp.new_cipher->algorithm_mkey; 906 cert=s->cert; 907 908 buf=s->init_buf; 909 910 r[0]=r[1]=r[2]=r[3]=NULL; 911 n=0; 912#ifndef OPENSSL_NO_RSA 913 if (type & SSL_kRSA) 914 { 915 rsa=cert->rsa_tmp; 916 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) 917 { 918 rsa=s->cert->rsa_tmp_cb(s, 919 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 920 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 921 if(rsa == NULL) 922 { 923 al=SSL_AD_HANDSHAKE_FAILURE; 924 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 925 goto f_err; 926 } 927 RSA_up_ref(rsa); 928 cert->rsa_tmp=rsa; 929 } 930 if (rsa == NULL) 931 { 932 al=SSL_AD_HANDSHAKE_FAILURE; 933 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); 934 goto f_err; 935 } 936 r[0]=rsa->n; 937 r[1]=rsa->e; 938 s->s3->tmp.use_rsa_tmp=1; 939 } 940 else 941#endif 942#ifndef OPENSSL_NO_DH 943 if (type & SSL_kEDH) 944 { 945 dhp=cert->dh_tmp; 946 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 947 dhp=s->cert->dh_tmp_cb(s, 948 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 949 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 950 if (dhp == NULL) 951 { 952 al=SSL_AD_HANDSHAKE_FAILURE; 953 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 954 goto f_err; 955 } 956 957 if (s->s3->tmp.dh != NULL) 958 { 959 DH_free(dh); 960 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 961 goto err; 962 } 963 964 if ((dh=DHparams_dup(dhp)) == NULL) 965 { 966 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 967 goto err; 968 } 969 970 s->s3->tmp.dh=dh; 971 if ((dhp->pub_key == NULL || 972 dhp->priv_key == NULL || 973 (s->options & SSL_OP_SINGLE_DH_USE))) 974 { 975 if(!DH_generate_key(dh)) 976 { 977 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 978 ERR_R_DH_LIB); 979 goto err; 980 } 981 } 982 else 983 { 984 dh->pub_key=BN_dup(dhp->pub_key); 985 dh->priv_key=BN_dup(dhp->priv_key); 986 if ((dh->pub_key == NULL) || 987 (dh->priv_key == NULL)) 988 { 989 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 990 goto err; 991 } 992 } 993 r[0]=dh->p; 994 r[1]=dh->g; 995 r[2]=dh->pub_key; 996 } 997 else 998#endif 999#ifndef OPENSSL_NO_ECDH 1000 if (type & SSL_kEECDH) 1001 { 1002 const EC_GROUP *group; 1003 1004 ecdhp=cert->ecdh_tmp; 1005 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) 1006 { 1007 ecdhp=s->cert->ecdh_tmp_cb(s, 1008 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1009 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1010 } 1011 if (ecdhp == NULL) 1012 { 1013 al=SSL_AD_HANDSHAKE_FAILURE; 1014 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY); 1015 goto f_err; 1016 } 1017 1018 if (s->s3->tmp.ecdh != NULL) 1019 { 1020 EC_KEY_free(s->s3->tmp.ecdh); 1021 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1022 goto err; 1023 } 1024 1025 /* Duplicate the ECDH structure. */ 1026 if (ecdhp == NULL) 1027 { 1028 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1029 goto err; 1030 } 1031 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) 1032 { 1033 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1034 goto err; 1035 } 1036 1037 s->s3->tmp.ecdh=ecdh; 1038 if ((EC_KEY_get0_public_key(ecdh) == NULL) || 1039 (EC_KEY_get0_private_key(ecdh) == NULL) || 1040 (s->options & SSL_OP_SINGLE_ECDH_USE)) 1041 { 1042 if(!EC_KEY_generate_key(ecdh)) 1043 { 1044 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1045 goto err; 1046 } 1047 } 1048 1049 if (((group = EC_KEY_get0_group(ecdh)) == NULL) || 1050 (EC_KEY_get0_public_key(ecdh) == NULL) || 1051 (EC_KEY_get0_private_key(ecdh) == NULL)) 1052 { 1053 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1054 goto err; 1055 } 1056 1057 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1058 (EC_GROUP_get_degree(group) > 163)) 1059 { 1060 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1061 goto err; 1062 } 1063 1064 /* XXX: For now, we only support ephemeral ECDH 1065 * keys over named (not generic) curves. For 1066 * supported named curves, curve_id is non-zero. 1067 */ 1068 if ((curve_id = 1069 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) 1070 == 0) 1071 { 1072 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1073 goto err; 1074 } 1075 1076 /* Encode the public key. 1077 * First check the size of encoding and 1078 * allocate memory accordingly. 1079 */ 1080 encodedlen = EC_POINT_point2oct(group, 1081 EC_KEY_get0_public_key(ecdh), 1082 POINT_CONVERSION_UNCOMPRESSED, 1083 NULL, 0, NULL); 1084 1085 encodedPoint = (unsigned char *) 1086 OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 1087 bn_ctx = BN_CTX_new(); 1088 if ((encodedPoint == NULL) || (bn_ctx == NULL)) 1089 { 1090 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1091 goto err; 1092 } 1093 1094 1095 encodedlen = EC_POINT_point2oct(group, 1096 EC_KEY_get0_public_key(ecdh), 1097 POINT_CONVERSION_UNCOMPRESSED, 1098 encodedPoint, encodedlen, bn_ctx); 1099 1100 if (encodedlen == 0) 1101 { 1102 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1103 goto err; 1104 } 1105 1106 BN_CTX_free(bn_ctx); bn_ctx=NULL; 1107 1108 /* XXX: For now, we only support named (not 1109 * generic) curves in ECDH ephemeral key exchanges. 1110 * In this situation, we need four additional bytes 1111 * to encode the entire ServerECDHParams 1112 * structure. 1113 */ 1114 n = 4 + encodedlen; 1115 1116 /* We'll generate the serverKeyExchange message 1117 * explicitly so we can set these to NULLs 1118 */ 1119 r[0]=NULL; 1120 r[1]=NULL; 1121 r[2]=NULL; 1122 r[3]=NULL; 1123 } 1124 else 1125#endif /* !OPENSSL_NO_ECDH */ 1126#ifndef OPENSSL_NO_PSK 1127 if (type & SSL_kPSK) 1128 { 1129 /* reserve size for record length and PSK identity hint*/ 1130 n+=2+strlen(s->ctx->psk_identity_hint); 1131 } 1132 else 1133#endif /* !OPENSSL_NO_PSK */ 1134 { 1135 al=SSL_AD_HANDSHAKE_FAILURE; 1136 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1137 goto f_err; 1138 } 1139 for (i=0; r[i] != NULL; i++) 1140 { 1141 nr[i]=BN_num_bytes(r[i]); 1142 n+=2+nr[i]; 1143 } 1144 1145 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 1146 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 1147 { 1148 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher)) 1149 == NULL) 1150 { 1151 al=SSL_AD_DECODE_ERROR; 1152 goto f_err; 1153 } 1154 kn=EVP_PKEY_size(pkey); 1155 } 1156 else 1157 { 1158 pkey=NULL; 1159 kn=0; 1160 } 1161 1162 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) 1163 { 1164 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); 1165 goto err; 1166 } 1167 d=(unsigned char *)s->init_buf->data; 1168 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1169 1170 for (i=0; r[i] != NULL; i++) 1171 { 1172 s2n(nr[i],p); 1173 BN_bn2bin(r[i],p); 1174 p+=nr[i]; 1175 } 1176 1177#ifndef OPENSSL_NO_ECDH 1178 if (type & SSL_kEECDH) 1179 { 1180 /* XXX: For now, we only support named (not generic) curves. 1181 * In this situation, the serverKeyExchange message has: 1182 * [1 byte CurveType], [2 byte CurveName] 1183 * [1 byte length of encoded point], followed by 1184 * the actual encoded point itself 1185 */ 1186 *p = NAMED_CURVE_TYPE; 1187 p += 1; 1188 *p = 0; 1189 p += 1; 1190 *p = curve_id; 1191 p += 1; 1192 *p = encodedlen; 1193 p += 1; 1194 memcpy((unsigned char*)p, 1195 (unsigned char *)encodedPoint, 1196 encodedlen); 1197 OPENSSL_free(encodedPoint); 1198 encodedPoint = NULL; 1199 p += encodedlen; 1200 } 1201#endif 1202 1203#ifndef OPENSSL_NO_PSK 1204 if (type & SSL_kPSK) 1205 { 1206 /* copy PSK identity hint */ 1207 s2n(strlen(s->ctx->psk_identity_hint), p); 1208 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint)); 1209 p+=strlen(s->ctx->psk_identity_hint); 1210 } 1211#endif 1212 1213 /* not anonymous */ 1214 if (pkey != NULL) 1215 { 1216 /* n is the length of the params, they start at 1217 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space 1218 * at the end. */ 1219#ifndef OPENSSL_NO_RSA 1220 if (pkey->type == EVP_PKEY_RSA) 1221 { 1222 q=md_buf; 1223 j=0; 1224 for (num=2; num > 0; num--) 1225 { 1226 EVP_DigestInit_ex(&md_ctx,(num == 2) 1227 ?s->ctx->md5:s->ctx->sha1, NULL); 1228 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1229 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1230 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1231 EVP_DigestFinal_ex(&md_ctx,q, 1232 (unsigned int *)&i); 1233 q+=i; 1234 j+=i; 1235 } 1236 if (RSA_sign(NID_md5_sha1, md_buf, j, 1237 &(p[2]), &u, pkey->pkey.rsa) <= 0) 1238 { 1239 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); 1240 goto err; 1241 } 1242 s2n(u,p); 1243 n+=u+2; 1244 } 1245 else 1246#endif 1247#if !defined(OPENSSL_NO_DSA) 1248 if (pkey->type == EVP_PKEY_DSA) 1249 { 1250 /* lets do DSS */ 1251 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); 1252 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1253 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1254 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1255 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1256 (unsigned int *)&i,pkey)) 1257 { 1258 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); 1259 goto err; 1260 } 1261 s2n(i,p); 1262 n+=i+2; 1263 } 1264 else 1265#endif 1266#if !defined(OPENSSL_NO_ECDSA) 1267 if (pkey->type == EVP_PKEY_EC) 1268 { 1269 /* let's do ECDSA */ 1270 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL); 1271 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1272 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1273 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1274 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1275 (unsigned int *)&i,pkey)) 1276 { 1277 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA); 1278 goto err; 1279 } 1280 s2n(i,p); 1281 n+=i+2; 1282 } 1283 else 1284#endif 1285 { 1286 /* Is this error check actually needed? */ 1287 al=SSL_AD_HANDSHAKE_FAILURE; 1288 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); 1289 goto f_err; 1290 } 1291 } 1292 1293 d = dtls1_set_message_header(s, d, 1294 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1295 1296 /* we should now have things packed up, so lets send 1297 * it off */ 1298 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1299 s->init_off=0; 1300 1301 /* buffer the message to handle re-xmits */ 1302 dtls1_buffer_message(s, 0); 1303 } 1304 1305 s->state = SSL3_ST_SW_KEY_EXCH_B; 1306 EVP_MD_CTX_cleanup(&md_ctx); 1307 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1308f_err: 1309 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1310err: 1311#ifndef OPENSSL_NO_ECDH 1312 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1313 BN_CTX_free(bn_ctx); 1314#endif 1315 EVP_MD_CTX_cleanup(&md_ctx); 1316 return(-1); 1317 } 1318 1319int dtls1_send_certificate_request(SSL *s) 1320 { 1321 unsigned char *p,*d; 1322 int i,j,nl,off,n; 1323 STACK_OF(X509_NAME) *sk=NULL; 1324 X509_NAME *name; 1325 BUF_MEM *buf; 1326 unsigned int msg_len; 1327 1328 if (s->state == SSL3_ST_SW_CERT_REQ_A) 1329 { 1330 buf=s->init_buf; 1331 1332 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1333 1334 /* get the list of acceptable cert types */ 1335 p++; 1336 n=ssl3_get_req_cert_type(s,p); 1337 d[0]=n; 1338 p+=n; 1339 n++; 1340 1341 off=n; 1342 p+=2; 1343 n+=2; 1344 1345 sk=SSL_get_client_CA_list(s); 1346 nl=0; 1347 if (sk != NULL) 1348 { 1349 for (i=0; i<sk_X509_NAME_num(sk); i++) 1350 { 1351 name=sk_X509_NAME_value(sk,i); 1352 j=i2d_X509_NAME(name,NULL); 1353 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2)) 1354 { 1355 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); 1356 goto err; 1357 } 1358 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]); 1359 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 1360 { 1361 s2n(j,p); 1362 i2d_X509_NAME(name,&p); 1363 n+=2+j; 1364 nl+=2+j; 1365 } 1366 else 1367 { 1368 d=p; 1369 i2d_X509_NAME(name,&p); 1370 j-=2; s2n(j,d); j+=2; 1371 n+=j; 1372 nl+=j; 1373 } 1374 } 1375 } 1376 /* else no CA names */ 1377 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); 1378 s2n(nl,p); 1379 1380 d=(unsigned char *)buf->data; 1381 *(d++)=SSL3_MT_CERTIFICATE_REQUEST; 1382 l2n3(n,d); 1383 s2n(s->d1->handshake_write_seq,d); 1384 s->d1->handshake_write_seq++; 1385 1386 /* we should now have things packed up, so lets send 1387 * it off */ 1388 1389 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1390 s->init_off=0; 1391#ifdef NETSCAPE_HANG_BUG 1392/* XXX: what to do about this? */ 1393 p=(unsigned char *)s->init_buf->data + s->init_num; 1394 1395 /* do the header */ 1396 *(p++)=SSL3_MT_SERVER_DONE; 1397 *(p++)=0; 1398 *(p++)=0; 1399 *(p++)=0; 1400 s->init_num += 4; 1401#endif 1402 1403 /* XDTLS: set message header ? */ 1404 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1405 dtls1_set_message_header(s, (void *)s->init_buf->data, 1406 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); 1407 1408 /* buffer the message to handle re-xmits */ 1409 dtls1_buffer_message(s, 0); 1410 1411 s->state = SSL3_ST_SW_CERT_REQ_B; 1412 } 1413 1414 /* SSL3_ST_SW_CERT_REQ_B */ 1415 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1416err: 1417 return(-1); 1418 } 1419 1420int dtls1_send_server_certificate(SSL *s) 1421 { 1422 unsigned long l; 1423 X509 *x; 1424 1425 if (s->state == SSL3_ST_SW_CERT_A) 1426 { 1427 x=ssl_get_server_send_cert(s); 1428 if (x == NULL) 1429 { 1430 /* VRS: allow null cert if auth == KRB5 */ 1431 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || 1432 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) 1433 { 1434 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1435 return(0); 1436 } 1437 } 1438 1439 l=dtls1_output_cert_chain(s,x); 1440 if (!l) 1441 { 1442 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1443 return(0); 1444 } 1445 s->state=SSL3_ST_SW_CERT_B; 1446 s->init_num=(int)l; 1447 s->init_off=0; 1448 1449 /* buffer the message to handle re-xmits */ 1450 dtls1_buffer_message(s, 0); 1451 } 1452 1453 /* SSL3_ST_SW_CERT_B */ 1454 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1455 } 1456 1457#ifndef OPENSSL_NO_TLSEXT 1458int dtls1_send_newsession_ticket(SSL *s) 1459 { 1460 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) 1461 { 1462 unsigned char *p, *senc, *macstart; 1463 int len, slen; 1464 unsigned int hlen, msg_len; 1465 EVP_CIPHER_CTX ctx; 1466 HMAC_CTX hctx; 1467 SSL_CTX *tctx = s->initial_ctx; 1468 unsigned char iv[EVP_MAX_IV_LENGTH]; 1469 unsigned char key_name[16]; 1470 1471 /* get session encoding length */ 1472 slen = i2d_SSL_SESSION(s->session, NULL); 1473 /* Some length values are 16 bits, so forget it if session is 1474 * too long 1475 */ 1476 if (slen > 0xFF00) 1477 return -1; 1478 /* Grow buffer if need be: the length calculation is as 1479 * follows 12 (DTLS handshake message header) + 1480 * 4 (ticket lifetime hint) + 2 (ticket length) + 1481 * 16 (key name) + max_iv_len (iv length) + 1482 * session_length + max_enc_block_size (max encrypted session 1483 * length) + max_md_size (HMAC). 1484 */ 1485 if (!BUF_MEM_grow(s->init_buf, 1486 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1487 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1488 return -1; 1489 senc = OPENSSL_malloc(slen); 1490 if (!senc) 1491 return -1; 1492 p = senc; 1493 i2d_SSL_SESSION(s->session, &p); 1494 1495 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1496 EVP_CIPHER_CTX_init(&ctx); 1497 HMAC_CTX_init(&hctx); 1498 /* Initialize HMAC and cipher contexts. If callback present 1499 * it does all the work otherwise use generated values 1500 * from parent ctx. 1501 */ 1502 if (tctx->tlsext_ticket_key_cb) 1503 { 1504 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1505 &hctx, 1) < 0) 1506 { 1507 OPENSSL_free(senc); 1508 return -1; 1509 } 1510 } 1511 else 1512 { 1513 RAND_pseudo_bytes(iv, 16); 1514 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1515 tctx->tlsext_tick_aes_key, iv); 1516 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1517 tlsext_tick_md(), NULL); 1518 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1519 } 1520 l2n(s->session->tlsext_tick_lifetime_hint, p); 1521 /* Skip ticket length for now */ 1522 p += 2; 1523 /* Output key name */ 1524 macstart = p; 1525 memcpy(p, key_name, 16); 1526 p += 16; 1527 /* output IV */ 1528 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1529 p += EVP_CIPHER_CTX_iv_length(&ctx); 1530 /* Encrypt session data */ 1531 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1532 p += len; 1533 EVP_EncryptFinal(&ctx, p, &len); 1534 p += len; 1535 EVP_CIPHER_CTX_cleanup(&ctx); 1536 1537 HMAC_Update(&hctx, macstart, p - macstart); 1538 HMAC_Final(&hctx, p, &hlen); 1539 HMAC_CTX_cleanup(&hctx); 1540 1541 p += hlen; 1542 /* Now write out lengths: p points to end of data written */ 1543 /* Total length */ 1544 len = p - (unsigned char *)(s->init_buf->data); 1545 /* Ticket length */ 1546 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1547 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1548 1549 /* number of bytes to write */ 1550 s->init_num= len; 1551 s->state=SSL3_ST_SW_SESSION_TICKET_B; 1552 s->init_off=0; 1553 OPENSSL_free(senc); 1554 1555 /* XDTLS: set message header ? */ 1556 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1557 dtls1_set_message_header(s, (void *)s->init_buf->data, 1558 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len); 1559 1560 /* buffer the message to handle re-xmits */ 1561 dtls1_buffer_message(s, 0); 1562 } 1563 1564 /* SSL3_ST_SW_SESSION_TICKET_B */ 1565 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1566 } 1567#endif 1568