d1_srvr.c revision 325335
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 == DTLS_ANY_VERSION) 135 return DTLS_server_method(); 136 else if (ver == DTLS1_VERSION) 137 return DTLSv1_server_method(); 138 else if (ver == DTLS1_2_VERSION) 139 return DTLSv1_2_server_method(); 140 else 141 return NULL; 142} 143 144IMPLEMENT_dtls1_meth_func(DTLS1_VERSION, 145 DTLSv1_server_method, 146 dtls1_accept, 147 ssl_undefined_function, 148 dtls1_get_server_method, DTLSv1_enc_data) 149 150IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION, 151 DTLSv1_2_server_method, 152 dtls1_accept, 153 ssl_undefined_function, 154 dtls1_get_server_method, DTLSv1_2_enc_data) 155 156IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION, 157 DTLS_server_method, 158 dtls1_accept, 159 ssl_undefined_function, 160 dtls1_get_server_method, DTLSv1_2_enc_data) 161 162int dtls1_accept(SSL *s) 163{ 164 BUF_MEM *buf; 165 unsigned long Time = (unsigned long)time(NULL); 166 void (*cb) (const SSL *ssl, int type, int val) = NULL; 167 unsigned long alg_k; 168 int ret = -1; 169 int new_state, state, skip = 0; 170 int listen; 171#ifndef OPENSSL_NO_SCTP 172 unsigned char sctpauthkey[64]; 173 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 174#endif 175 176 RAND_add(&Time, sizeof(Time), 0); 177 ERR_clear_error(); 178 clear_sys_error(); 179 180 if (s->info_callback != NULL) 181 cb = s->info_callback; 182 else if (s->ctx->info_callback != NULL) 183 cb = s->ctx->info_callback; 184 185 listen = s->d1->listen; 186 187 /* init things to blank */ 188 s->in_handshake++; 189 if (!SSL_in_init(s) || SSL_in_before(s)) 190 SSL_clear(s); 191 192 s->d1->listen = listen; 193#ifndef OPENSSL_NO_SCTP 194 /* 195 * Notify SCTP BIO socket to enter handshake mode and prevent stream 196 * identifier other than 0. Will be ignored if no SCTP is used. 197 */ 198 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 199 s->in_handshake, NULL); 200#endif 201 202 if (s->cert == NULL) { 203 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET); 204 return (-1); 205 } 206#ifndef OPENSSL_NO_HEARTBEATS 207 /* 208 * If we're awaiting a HeartbeatResponse, pretend we already got and 209 * don't await it anymore, because Heartbeats don't make sense during 210 * handshakes anyway. 211 */ 212 if (s->tlsext_hb_pending) { 213 dtls1_stop_timer(s); 214 s->tlsext_hb_pending = 0; 215 s->tlsext_hb_seq++; 216 } 217#endif 218 219 for (;;) { 220 state = s->state; 221 222 switch (s->state) { 223 case SSL_ST_RENEGOTIATE: 224 s->renegotiate = 1; 225 /* s->state=SSL_ST_ACCEPT; */ 226 227 case SSL_ST_BEFORE: 228 case SSL_ST_ACCEPT: 229 case SSL_ST_BEFORE | SSL_ST_ACCEPT: 230 case SSL_ST_OK | SSL_ST_ACCEPT: 231 232 s->server = 1; 233 if (cb != NULL) 234 cb(s, SSL_CB_HANDSHAKE_START, 1); 235 236 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { 237 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 238 return -1; 239 } 240 s->type = SSL_ST_ACCEPT; 241 242 if (s->init_buf == NULL) { 243 if ((buf = BUF_MEM_new()) == NULL) { 244 ret = -1; 245 s->state = SSL_ST_ERR; 246 goto end; 247 } 248 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 249 BUF_MEM_free(buf); 250 ret = -1; 251 s->state = SSL_ST_ERR; 252 goto end; 253 } 254 s->init_buf = buf; 255 } 256 257 if (!ssl3_setup_buffers(s)) { 258 ret = -1; 259 s->state = SSL_ST_ERR; 260 goto end; 261 } 262 263 s->init_num = 0; 264 s->d1->change_cipher_spec_ok = 0; 265 /* 266 * Should have been reset by ssl3_get_finished, too. 267 */ 268 s->s3->change_cipher_spec = 0; 269 270 if (s->state != SSL_ST_RENEGOTIATE) { 271 /* 272 * Ok, we now need to push on a buffering BIO so that the 273 * output is sent in a way that TCP likes :-) ...but not with 274 * SCTP :-) 275 */ 276#ifndef OPENSSL_NO_SCTP 277 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) 278#endif 279 if (!ssl_init_wbio_buffer(s, 1)) { 280 ret = -1; 281 s->state = SSL_ST_ERR; 282 goto end; 283 } 284 285 if (!ssl3_init_finished_mac(s)) { 286 ret = -1; 287 s->state = SSL_ST_ERR; 288 goto end; 289 } 290 291 s->state = SSL3_ST_SR_CLNT_HELLO_A; 292 s->ctx->stats.sess_accept++; 293 } else if (!s->s3->send_connection_binding && 294 !(s->options & 295 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { 296 /* 297 * Server attempting to renegotiate with client that doesn't 298 * support secure renegotiation. 299 */ 300 SSLerr(SSL_F_DTLS1_ACCEPT, 301 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 302 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 303 ret = -1; 304 s->state = SSL_ST_ERR; 305 goto end; 306 } else { 307 /* 308 * s->state == SSL_ST_RENEGOTIATE, we will just send a 309 * HelloRequest 310 */ 311 s->ctx->stats.sess_accept_renegotiate++; 312 s->state = SSL3_ST_SW_HELLO_REQ_A; 313 } 314 315 break; 316 317 case SSL3_ST_SW_HELLO_REQ_A: 318 case SSL3_ST_SW_HELLO_REQ_B: 319 320 s->shutdown = 0; 321 dtls1_clear_sent_buffer(s); 322 dtls1_start_timer(s); 323 ret = ssl3_send_hello_request(s); 324 if (ret <= 0) 325 goto end; 326 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 327 s->state = SSL3_ST_SW_FLUSH; 328 s->init_num = 0; 329 330 if (!ssl3_init_finished_mac(s)) { 331 ret = -1; 332 s->state = SSL_ST_ERR; 333 goto end; 334 } 335 break; 336 337 case SSL3_ST_SW_HELLO_REQ_C: 338 s->state = SSL_ST_OK; 339 break; 340 341 case SSL3_ST_SR_CLNT_HELLO_A: 342 case SSL3_ST_SR_CLNT_HELLO_B: 343 case SSL3_ST_SR_CLNT_HELLO_C: 344 345 s->shutdown = 0; 346 ret = ssl3_get_client_hello(s); 347 if (ret <= 0) 348 goto end; 349 dtls1_stop_timer(s); 350 351 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 352 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 353 else 354 s->state = SSL3_ST_SW_SRVR_HELLO_A; 355 356 s->init_num = 0; 357 358 /* If we're just listening, stop here */ 359 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) { 360 ret = 2; 361 s->d1->listen = 0; 362 /* 363 * Set expected sequence numbers to continue the handshake. 364 */ 365 s->d1->handshake_read_seq = 2; 366 s->d1->handshake_write_seq = 1; 367 s->d1->next_handshake_write_seq = 1; 368 goto end; 369 } 370 371 break; 372 373 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 374 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 375 376 ret = dtls1_send_hello_verify_request(s); 377 if (ret <= 0) 378 goto end; 379 s->state = SSL3_ST_SW_FLUSH; 380 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 381 382 /* HelloVerifyRequest resets Finished MAC */ 383 if (s->version != DTLS1_BAD_VER) 384 if (!ssl3_init_finished_mac(s)) { 385 ret = -1; 386 s->state = SSL_ST_ERR; 387 goto end; 388 } 389 break; 390 391#ifndef OPENSSL_NO_SCTP 392 case DTLS1_SCTP_ST_SR_READ_SOCK: 393 394 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { 395 s->s3->in_read_app_data = 2; 396 s->rwstate = SSL_READING; 397 BIO_clear_retry_flags(SSL_get_rbio(s)); 398 BIO_set_retry_read(SSL_get_rbio(s)); 399 ret = -1; 400 goto end; 401 } 402 403 s->state = SSL3_ST_SR_FINISHED_A; 404 break; 405 406 case DTLS1_SCTP_ST_SW_WRITE_SOCK: 407 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 408 if (ret < 0) 409 goto end; 410 411 if (ret == 0) { 412 if (s->d1->next_state != SSL_ST_OK) { 413 s->s3->in_read_app_data = 2; 414 s->rwstate = SSL_READING; 415 BIO_clear_retry_flags(SSL_get_rbio(s)); 416 BIO_set_retry_read(SSL_get_rbio(s)); 417 ret = -1; 418 goto end; 419 } 420 } 421 422 s->state = s->d1->next_state; 423 break; 424#endif 425 426 case SSL3_ST_SW_SRVR_HELLO_A: 427 case SSL3_ST_SW_SRVR_HELLO_B: 428 s->renegotiate = 2; 429 dtls1_start_timer(s); 430 ret = ssl3_send_server_hello(s); 431 if (ret <= 0) 432 goto end; 433 434 if (s->hit) { 435#ifndef OPENSSL_NO_SCTP 436 /* 437 * Add new shared key for SCTP-Auth, will be ignored if no 438 * SCTP used. 439 */ 440 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 441 DTLS1_SCTP_AUTH_LABEL); 442 443 if (SSL_export_keying_material(s, sctpauthkey, 444 sizeof(sctpauthkey), labelbuffer, 445 sizeof(labelbuffer), NULL, 0, 0) <= 0) { 446 ret = -1; 447 s->state = SSL_ST_ERR; 448 goto end; 449 } 450 451 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 452 sizeof(sctpauthkey), sctpauthkey); 453#endif 454#ifndef OPENSSL_NO_TLSEXT 455 if (s->tlsext_ticket_expected) 456 s->state = SSL3_ST_SW_SESSION_TICKET_A; 457 else 458 s->state = SSL3_ST_SW_CHANGE_A; 459#else 460 s->state = SSL3_ST_SW_CHANGE_A; 461#endif 462 } else 463 s->state = SSL3_ST_SW_CERT_A; 464 s->init_num = 0; 465 break; 466 467 case SSL3_ST_SW_CERT_A: 468 case SSL3_ST_SW_CERT_B: 469 /* Check if it is anon DH or normal PSK */ 470 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 471 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 472 dtls1_start_timer(s); 473 ret = ssl3_send_server_certificate(s); 474 if (ret <= 0) 475 goto end; 476#ifndef OPENSSL_NO_TLSEXT 477 if (s->tlsext_status_expected) 478 s->state = SSL3_ST_SW_CERT_STATUS_A; 479 else 480 s->state = SSL3_ST_SW_KEY_EXCH_A; 481 } else { 482 skip = 1; 483 s->state = SSL3_ST_SW_KEY_EXCH_A; 484 } 485#else 486 } else 487 skip = 1; 488 489 s->state = SSL3_ST_SW_KEY_EXCH_A; 490#endif 491 s->init_num = 0; 492 break; 493 494 case SSL3_ST_SW_KEY_EXCH_A: 495 case SSL3_ST_SW_KEY_EXCH_B: 496 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 497 498 /* 499 * clear this, it may get reset by 500 * send_server_key_exchange 501 */ 502 s->s3->tmp.use_rsa_tmp = 0; 503 504 /* 505 * only send if a DH key exchange or RSA but we have a sign only 506 * certificate 507 */ 508 if (0 509 /* 510 * PSK: send ServerKeyExchange if PSK identity hint if 511 * provided 512 */ 513#ifndef OPENSSL_NO_PSK 514 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) 515#endif 516 || (alg_k & SSL_kDHE) 517 || (alg_k & SSL_kEECDH) 518 || ((alg_k & SSL_kRSA) 519 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 520 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 521 && EVP_PKEY_size(s->cert->pkeys 522 [SSL_PKEY_RSA_ENC].privatekey) * 523 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 524 ) 525 ) 526 ) 527 ) { 528 dtls1_start_timer(s); 529 ret = ssl3_send_server_key_exchange(s); 530 if (ret <= 0) 531 goto end; 532 } else 533 skip = 1; 534 535 s->state = SSL3_ST_SW_CERT_REQ_A; 536 s->init_num = 0; 537 break; 538 539 case SSL3_ST_SW_CERT_REQ_A: 540 case SSL3_ST_SW_CERT_REQ_B: 541 if ( /* don't request cert unless asked for it: */ 542 !(s->verify_mode & SSL_VERIFY_PEER) || 543 /* 544 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert 545 * during re-negotiation: 546 */ 547 ((s->session->peer != NULL) && 548 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 549 /* 550 * never request cert in anonymous ciphersuites (see 551 * section "Certificate request" in SSL 3 drafts and in 552 * RFC 2246): 553 */ 554 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 555 /* 556 * ... except when the application insists on 557 * verification (against the specs, but s3_clnt.c accepts 558 * this for SSL 3) 559 */ 560 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 561 /* 562 * never request cert in Kerberos ciphersuites 563 */ 564 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 565 /* 566 * With normal PSK Certificates and Certificate Requests 567 * are omitted 568 */ 569 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 570 /* no cert request */ 571 skip = 1; 572 s->s3->tmp.cert_request = 0; 573 s->state = SSL3_ST_SW_SRVR_DONE_A; 574#ifndef OPENSSL_NO_SCTP 575 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 576 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 577 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 578 } 579#endif 580 } else { 581 s->s3->tmp.cert_request = 1; 582 dtls1_start_timer(s); 583 ret = ssl3_send_certificate_request(s); 584 if (ret <= 0) 585 goto end; 586#ifndef NETSCAPE_HANG_BUG 587 s->state = SSL3_ST_SW_SRVR_DONE_A; 588# ifndef OPENSSL_NO_SCTP 589 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 590 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 591 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 592 } 593# endif 594#else 595 s->state = SSL3_ST_SW_FLUSH; 596 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 597# ifndef OPENSSL_NO_SCTP 598 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 599 s->d1->next_state = s->s3->tmp.next_state; 600 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 601 } 602# endif 603#endif 604 s->init_num = 0; 605 } 606 break; 607 608 case SSL3_ST_SW_SRVR_DONE_A: 609 case SSL3_ST_SW_SRVR_DONE_B: 610 dtls1_start_timer(s); 611 ret = ssl3_send_server_done(s); 612 if (ret <= 0) 613 goto end; 614 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 615 s->state = SSL3_ST_SW_FLUSH; 616 s->init_num = 0; 617 break; 618 619 case SSL3_ST_SW_FLUSH: 620 s->rwstate = SSL_WRITING; 621 if (BIO_flush(s->wbio) <= 0) { 622 /* 623 * If the write error was fatal, stop trying 624 */ 625 if (!BIO_should_retry(s->wbio)) { 626 s->rwstate = SSL_NOTHING; 627 s->state = s->s3->tmp.next_state; 628 } 629 630 ret = -1; 631 goto end; 632 } 633 s->rwstate = SSL_NOTHING; 634 s->state = s->s3->tmp.next_state; 635 break; 636 637 case SSL3_ST_SR_CERT_A: 638 case SSL3_ST_SR_CERT_B: 639 if (s->s3->tmp.cert_request) { 640 ret = ssl3_get_client_certificate(s); 641 if (ret <= 0) 642 goto end; 643 } 644 s->init_num = 0; 645 s->state = SSL3_ST_SR_KEY_EXCH_A; 646 break; 647 648 case SSL3_ST_SR_KEY_EXCH_A: 649 case SSL3_ST_SR_KEY_EXCH_B: 650 ret = ssl3_get_client_key_exchange(s); 651 if (ret <= 0) 652 goto end; 653#ifndef OPENSSL_NO_SCTP 654 /* 655 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 656 * used. 657 */ 658 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 659 DTLS1_SCTP_AUTH_LABEL); 660 661 if (SSL_export_keying_material(s, sctpauthkey, 662 sizeof(sctpauthkey), labelbuffer, 663 sizeof(labelbuffer), NULL, 0, 0) <= 0) { 664 ret = -1; 665 s->state = SSL_ST_ERR; 666 goto end; 667 } 668 669 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 670 sizeof(sctpauthkey), sctpauthkey); 671#endif 672 673 s->state = SSL3_ST_SR_CERT_VRFY_A; 674 s->init_num = 0; 675 676 if (ret == 2) { 677 /* 678 * For the ECDH ciphersuites when the client sends its ECDH 679 * pub key in a certificate, the CertificateVerify message is 680 * not sent. 681 */ 682 s->state = SSL3_ST_SR_FINISHED_A; 683 s->init_num = 0; 684 } else if (SSL_USE_SIGALGS(s)) { 685 s->state = SSL3_ST_SR_CERT_VRFY_A; 686 s->init_num = 0; 687 if (!s->session->peer) 688 break; 689 /* 690 * For sigalgs freeze the handshake buffer at this point and 691 * digest cached records. 692 */ 693 if (!s->s3->handshake_buffer) { 694 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 695 s->state = SSL_ST_ERR; 696 return -1; 697 } 698 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE; 699 if (!ssl3_digest_cached_records(s)) { 700 s->state = SSL_ST_ERR; 701 return -1; 702 } 703 } else { 704 s->state = SSL3_ST_SR_CERT_VRFY_A; 705 s->init_num = 0; 706 707 /* 708 * We need to get hashes here so if there is a client cert, 709 * it can be verified 710 */ 711 s->method->ssl3_enc->cert_verify_mac(s, 712 NID_md5, 713 &(s->s3-> 714 tmp.cert_verify_md 715 [0])); 716 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1, 717 &(s->s3-> 718 tmp.cert_verify_md 719 [MD5_DIGEST_LENGTH])); 720 } 721 break; 722 723 case SSL3_ST_SR_CERT_VRFY_A: 724 case SSL3_ST_SR_CERT_VRFY_B: 725 ret = ssl3_get_cert_verify(s); 726 if (ret <= 0) 727 goto end; 728#ifndef OPENSSL_NO_SCTP 729 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 730 state == SSL_ST_RENEGOTIATE) 731 s->state = DTLS1_SCTP_ST_SR_READ_SOCK; 732 else 733#endif 734 s->state = SSL3_ST_SR_FINISHED_A; 735 s->init_num = 0; 736 break; 737 738 case SSL3_ST_SR_FINISHED_A: 739 case SSL3_ST_SR_FINISHED_B: 740 /* 741 * Enable CCS. Receiving a CCS clears the flag, so make 742 * sure not to re-enable it to ban duplicates. This *should* be the 743 * first time we have received one - but we check anyway to be 744 * cautious. 745 * s->s3->change_cipher_spec is set when a CCS is 746 * processed in d1_pkt.c, and remains set until 747 * the client's Finished message is read. 748 */ 749 if (!s->s3->change_cipher_spec) 750 s->d1->change_cipher_spec_ok = 1; 751 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 752 SSL3_ST_SR_FINISHED_B); 753 if (ret <= 0) 754 goto end; 755 dtls1_stop_timer(s); 756 if (s->hit) 757 s->state = SSL_ST_OK; 758#ifndef OPENSSL_NO_TLSEXT 759 else if (s->tlsext_ticket_expected) 760 s->state = SSL3_ST_SW_SESSION_TICKET_A; 761#endif 762 else 763 s->state = SSL3_ST_SW_CHANGE_A; 764 s->init_num = 0; 765 break; 766 767#ifndef OPENSSL_NO_TLSEXT 768 case SSL3_ST_SW_SESSION_TICKET_A: 769 case SSL3_ST_SW_SESSION_TICKET_B: 770 ret = ssl3_send_newsession_ticket(s); 771 if (ret <= 0) 772 goto end; 773 s->state = SSL3_ST_SW_CHANGE_A; 774 s->init_num = 0; 775 break; 776 777 case SSL3_ST_SW_CERT_STATUS_A: 778 case SSL3_ST_SW_CERT_STATUS_B: 779 ret = ssl3_send_cert_status(s); 780 if (ret <= 0) 781 goto end; 782 s->state = SSL3_ST_SW_KEY_EXCH_A; 783 s->init_num = 0; 784 break; 785 786#endif 787 788 case SSL3_ST_SW_CHANGE_A: 789 case SSL3_ST_SW_CHANGE_B: 790 791 s->session->cipher = s->s3->tmp.new_cipher; 792 if (!s->method->ssl3_enc->setup_key_block(s)) { 793 ret = -1; 794 s->state = SSL_ST_ERR; 795 goto end; 796 } 797 798 ret = dtls1_send_change_cipher_spec(s, 799 SSL3_ST_SW_CHANGE_A, 800 SSL3_ST_SW_CHANGE_B); 801 802 if (ret <= 0) 803 goto end; 804 805#ifndef OPENSSL_NO_SCTP 806 if (!s->hit) { 807 /* 808 * Change to new shared key of SCTP-Auth, will be ignored if 809 * no SCTP used. 810 */ 811 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 812 0, NULL); 813 } 814#endif 815 816 s->state = SSL3_ST_SW_FINISHED_A; 817 s->init_num = 0; 818 819 if (!s->method->ssl3_enc->change_cipher_state(s, 820 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 821 { 822 ret = -1; 823 s->state = SSL_ST_ERR; 824 goto end; 825 } 826 827 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 828 break; 829 830 case SSL3_ST_SW_FINISHED_A: 831 case SSL3_ST_SW_FINISHED_B: 832 ret = ssl3_send_finished(s, 833 SSL3_ST_SW_FINISHED_A, 834 SSL3_ST_SW_FINISHED_B, 835 s->method-> 836 ssl3_enc->server_finished_label, 837 s->method-> 838 ssl3_enc->server_finished_label_len); 839 if (ret <= 0) 840 goto end; 841 s->state = SSL3_ST_SW_FLUSH; 842 if (s->hit) { 843 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A; 844 845#ifndef OPENSSL_NO_SCTP 846 /* 847 * Change to new shared key of SCTP-Auth, will be ignored if 848 * no SCTP used. 849 */ 850 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 851 0, NULL); 852#endif 853 } else { 854 s->s3->tmp.next_state = SSL_ST_OK; 855#ifndef OPENSSL_NO_SCTP 856 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 857 s->d1->next_state = s->s3->tmp.next_state; 858 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 859 } 860#endif 861 } 862 s->init_num = 0; 863 break; 864 865 case SSL_ST_OK: 866 /* clean a few things up */ 867 ssl3_cleanup_key_block(s); 868 869#if 0 870 BUF_MEM_free(s->init_buf); 871 s->init_buf = NULL; 872#endif 873 874 /* remove buffering on output */ 875 ssl_free_wbio_buffer(s); 876 877 s->init_num = 0; 878 879 if (s->renegotiate == 2) { /* skipped if we just sent a 880 * HelloRequest */ 881 s->renegotiate = 0; 882 s->new_session = 0; 883 884 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 885 886 s->ctx->stats.sess_accept_good++; 887 /* s->server=1; */ 888 s->handshake_func = dtls1_accept; 889 890 if (cb != NULL) 891 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 892 } 893 894 ret = 1; 895 896 /* done handshaking, next message is client hello */ 897 s->d1->handshake_read_seq = 0; 898 /* next message is server hello */ 899 s->d1->handshake_write_seq = 0; 900 s->d1->next_handshake_write_seq = 0; 901 dtls1_clear_received_buffer(s); 902 goto end; 903 /* break; */ 904 905 case SSL_ST_ERR: 906 default: 907 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE); 908 ret = -1; 909 goto end; 910 /* break; */ 911 } 912 913 if (!s->s3->tmp.reuse_message && !skip) { 914 if (s->debug) { 915 if ((ret = BIO_flush(s->wbio)) <= 0) 916 goto end; 917 } 918 919 if ((cb != NULL) && (s->state != state)) { 920 new_state = s->state; 921 s->state = state; 922 cb(s, SSL_CB_ACCEPT_LOOP, 1); 923 s->state = new_state; 924 } 925 } 926 skip = 0; 927 } 928 end: 929 /* BIO_flush(s->wbio); */ 930 931 s->in_handshake--; 932#ifndef OPENSSL_NO_SCTP 933 /* 934 * Notify SCTP BIO socket to leave handshake mode and prevent stream 935 * identifier other than 0. Will be ignored if no SCTP is used. 936 */ 937 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 938 s->in_handshake, NULL); 939#endif 940 941 if (cb != NULL) 942 cb(s, SSL_CB_ACCEPT_EXIT, ret); 943 return (ret); 944} 945 946int dtls1_send_hello_verify_request(SSL *s) 947{ 948 unsigned int msg_len; 949 unsigned char *msg, *buf, *p; 950 951 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 952 buf = (unsigned char *)s->init_buf->data; 953 954 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 955 /* Always use DTLS 1.0 version: see RFC 6347 */ 956 *(p++) = DTLS1_VERSION >> 8; 957 *(p++) = DTLS1_VERSION & 0xFF; 958 959 if (s->ctx->app_gen_cookie_cb == NULL || 960 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 961 &(s->d1->cookie_len)) == 0) { 962 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST, 963 ERR_R_INTERNAL_ERROR); 964 s->state = SSL_ST_ERR; 965 return 0; 966 } 967 968 *(p++) = (unsigned char)s->d1->cookie_len; 969 memcpy(p, s->d1->cookie, s->d1->cookie_len); 970 p += s->d1->cookie_len; 971 msg_len = p - msg; 972 973 dtls1_set_message_header(s, buf, 974 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, 975 msg_len); 976 977 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 978 /* number of bytes to write */ 979 s->init_num = p - buf; 980 s->init_off = 0; 981 } 982 983 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 984 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 985} 986