d1_srvr.c revision 306195
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 ssl3_init_finished_mac(s); 286 s->state = SSL3_ST_SR_CLNT_HELLO_A; 287 s->ctx->stats.sess_accept++; 288 } else if (!s->s3->send_connection_binding && 289 !(s->options & 290 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { 291 /* 292 * Server attempting to renegotiate with client that doesn't 293 * support secure renegotiation. 294 */ 295 SSLerr(SSL_F_DTLS1_ACCEPT, 296 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 297 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 298 ret = -1; 299 s->state = SSL_ST_ERR; 300 goto end; 301 } else { 302 /* 303 * s->state == SSL_ST_RENEGOTIATE, we will just send a 304 * HelloRequest 305 */ 306 s->ctx->stats.sess_accept_renegotiate++; 307 s->state = SSL3_ST_SW_HELLO_REQ_A; 308 } 309 310 break; 311 312 case SSL3_ST_SW_HELLO_REQ_A: 313 case SSL3_ST_SW_HELLO_REQ_B: 314 315 s->shutdown = 0; 316 dtls1_clear_sent_buffer(s); 317 dtls1_start_timer(s); 318 ret = ssl3_send_hello_request(s); 319 if (ret <= 0) 320 goto end; 321 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 322 s->state = SSL3_ST_SW_FLUSH; 323 s->init_num = 0; 324 325 ssl3_init_finished_mac(s); 326 break; 327 328 case SSL3_ST_SW_HELLO_REQ_C: 329 s->state = SSL_ST_OK; 330 break; 331 332 case SSL3_ST_SR_CLNT_HELLO_A: 333 case SSL3_ST_SR_CLNT_HELLO_B: 334 case SSL3_ST_SR_CLNT_HELLO_C: 335 336 s->shutdown = 0; 337 ret = ssl3_get_client_hello(s); 338 if (ret <= 0) 339 goto end; 340 dtls1_stop_timer(s); 341 342 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 343 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 344 else 345 s->state = SSL3_ST_SW_SRVR_HELLO_A; 346 347 s->init_num = 0; 348 349 /* 350 * Reflect ClientHello sequence to remain stateless while 351 * listening 352 */ 353 if (listen) { 354 memcpy(s->s3->write_sequence, s->s3->read_sequence, 355 sizeof(s->s3->write_sequence)); 356 } 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 ssl3_init_finished_mac(s); 385 break; 386 387#ifndef OPENSSL_NO_SCTP 388 case DTLS1_SCTP_ST_SR_READ_SOCK: 389 390 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { 391 s->s3->in_read_app_data = 2; 392 s->rwstate = SSL_READING; 393 BIO_clear_retry_flags(SSL_get_rbio(s)); 394 BIO_set_retry_read(SSL_get_rbio(s)); 395 ret = -1; 396 goto end; 397 } 398 399 s->state = SSL3_ST_SR_FINISHED_A; 400 break; 401 402 case DTLS1_SCTP_ST_SW_WRITE_SOCK: 403 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 404 if (ret < 0) 405 goto end; 406 407 if (ret == 0) { 408 if (s->d1->next_state != SSL_ST_OK) { 409 s->s3->in_read_app_data = 2; 410 s->rwstate = SSL_READING; 411 BIO_clear_retry_flags(SSL_get_rbio(s)); 412 BIO_set_retry_read(SSL_get_rbio(s)); 413 ret = -1; 414 goto end; 415 } 416 } 417 418 s->state = s->d1->next_state; 419 break; 420#endif 421 422 case SSL3_ST_SW_SRVR_HELLO_A: 423 case SSL3_ST_SW_SRVR_HELLO_B: 424 s->renegotiate = 2; 425 dtls1_start_timer(s); 426 ret = ssl3_send_server_hello(s); 427 if (ret <= 0) 428 goto end; 429 430 if (s->hit) { 431#ifndef OPENSSL_NO_SCTP 432 /* 433 * Add new shared key for SCTP-Auth, will be ignored if no 434 * SCTP used. 435 */ 436 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 437 DTLS1_SCTP_AUTH_LABEL); 438 439 if (SSL_export_keying_material(s, sctpauthkey, 440 sizeof(sctpauthkey), labelbuffer, 441 sizeof(labelbuffer), NULL, 0, 0) <= 0) { 442 ret = -1; 443 s->state = SSL_ST_ERR; 444 goto end; 445 } 446 447 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 448 sizeof(sctpauthkey), sctpauthkey); 449#endif 450#ifndef OPENSSL_NO_TLSEXT 451 if (s->tlsext_ticket_expected) 452 s->state = SSL3_ST_SW_SESSION_TICKET_A; 453 else 454 s->state = SSL3_ST_SW_CHANGE_A; 455#else 456 s->state = SSL3_ST_SW_CHANGE_A; 457#endif 458 } else 459 s->state = SSL3_ST_SW_CERT_A; 460 s->init_num = 0; 461 break; 462 463 case SSL3_ST_SW_CERT_A: 464 case SSL3_ST_SW_CERT_B: 465 /* Check if it is anon DH or normal PSK */ 466 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 467 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 468 dtls1_start_timer(s); 469 ret = ssl3_send_server_certificate(s); 470 if (ret <= 0) 471 goto end; 472#ifndef OPENSSL_NO_TLSEXT 473 if (s->tlsext_status_expected) 474 s->state = SSL3_ST_SW_CERT_STATUS_A; 475 else 476 s->state = SSL3_ST_SW_KEY_EXCH_A; 477 } else { 478 skip = 1; 479 s->state = SSL3_ST_SW_KEY_EXCH_A; 480 } 481#else 482 } else 483 skip = 1; 484 485 s->state = SSL3_ST_SW_KEY_EXCH_A; 486#endif 487 s->init_num = 0; 488 break; 489 490 case SSL3_ST_SW_KEY_EXCH_A: 491 case SSL3_ST_SW_KEY_EXCH_B: 492 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 493 494 /* 495 * clear this, it may get reset by 496 * send_server_key_exchange 497 */ 498 s->s3->tmp.use_rsa_tmp = 0; 499 500 /* 501 * only send if a DH key exchange or RSA but we have a sign only 502 * certificate 503 */ 504 if (0 505 /* 506 * PSK: send ServerKeyExchange if PSK identity hint if 507 * provided 508 */ 509#ifndef OPENSSL_NO_PSK 510 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) 511#endif 512 || (alg_k & SSL_kDHE) 513 || (alg_k & SSL_kEECDH) 514 || ((alg_k & SSL_kRSA) 515 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 516 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 517 && EVP_PKEY_size(s->cert->pkeys 518 [SSL_PKEY_RSA_ENC].privatekey) * 519 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 520 ) 521 ) 522 ) 523 ) { 524 dtls1_start_timer(s); 525 ret = ssl3_send_server_key_exchange(s); 526 if (ret <= 0) 527 goto end; 528 } else 529 skip = 1; 530 531 s->state = SSL3_ST_SW_CERT_REQ_A; 532 s->init_num = 0; 533 break; 534 535 case SSL3_ST_SW_CERT_REQ_A: 536 case SSL3_ST_SW_CERT_REQ_B: 537 if ( /* don't request cert unless asked for it: */ 538 !(s->verify_mode & SSL_VERIFY_PEER) || 539 /* 540 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert 541 * during re-negotiation: 542 */ 543 ((s->session->peer != NULL) && 544 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 545 /* 546 * never request cert in anonymous ciphersuites (see 547 * section "Certificate request" in SSL 3 drafts and in 548 * RFC 2246): 549 */ 550 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 551 /* 552 * ... except when the application insists on 553 * verification (against the specs, but s3_clnt.c accepts 554 * this for SSL 3) 555 */ 556 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 557 /* 558 * never request cert in Kerberos ciphersuites 559 */ 560 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 561 /* 562 * With normal PSK Certificates and Certificate Requests 563 * are omitted 564 */ 565 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 566 /* no cert request */ 567 skip = 1; 568 s->s3->tmp.cert_request = 0; 569 s->state = SSL3_ST_SW_SRVR_DONE_A; 570#ifndef OPENSSL_NO_SCTP 571 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 572 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 573 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 574 } 575#endif 576 } else { 577 s->s3->tmp.cert_request = 1; 578 dtls1_start_timer(s); 579 ret = ssl3_send_certificate_request(s); 580 if (ret <= 0) 581 goto end; 582#ifndef NETSCAPE_HANG_BUG 583 s->state = SSL3_ST_SW_SRVR_DONE_A; 584# ifndef OPENSSL_NO_SCTP 585 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 586 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 587 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 588 } 589# endif 590#else 591 s->state = SSL3_ST_SW_FLUSH; 592 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 593# ifndef OPENSSL_NO_SCTP 594 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 595 s->d1->next_state = s->s3->tmp.next_state; 596 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 597 } 598# endif 599#endif 600 s->init_num = 0; 601 } 602 break; 603 604 case SSL3_ST_SW_SRVR_DONE_A: 605 case SSL3_ST_SW_SRVR_DONE_B: 606 dtls1_start_timer(s); 607 ret = ssl3_send_server_done(s); 608 if (ret <= 0) 609 goto end; 610 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 611 s->state = SSL3_ST_SW_FLUSH; 612 s->init_num = 0; 613 break; 614 615 case SSL3_ST_SW_FLUSH: 616 s->rwstate = SSL_WRITING; 617 if (BIO_flush(s->wbio) <= 0) { 618 /* 619 * If the write error was fatal, stop trying 620 */ 621 if (!BIO_should_retry(s->wbio)) { 622 s->rwstate = SSL_NOTHING; 623 s->state = s->s3->tmp.next_state; 624 } 625 626 ret = -1; 627 goto end; 628 } 629 s->rwstate = SSL_NOTHING; 630 s->state = s->s3->tmp.next_state; 631 break; 632 633 case SSL3_ST_SR_CERT_A: 634 case SSL3_ST_SR_CERT_B: 635 if (s->s3->tmp.cert_request) { 636 ret = ssl3_get_client_certificate(s); 637 if (ret <= 0) 638 goto end; 639 } 640 s->init_num = 0; 641 s->state = SSL3_ST_SR_KEY_EXCH_A; 642 break; 643 644 case SSL3_ST_SR_KEY_EXCH_A: 645 case SSL3_ST_SR_KEY_EXCH_B: 646 ret = ssl3_get_client_key_exchange(s); 647 if (ret <= 0) 648 goto end; 649#ifndef OPENSSL_NO_SCTP 650 /* 651 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 652 * used. 653 */ 654 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 655 DTLS1_SCTP_AUTH_LABEL); 656 657 if (SSL_export_keying_material(s, sctpauthkey, 658 sizeof(sctpauthkey), labelbuffer, 659 sizeof(labelbuffer), NULL, 0, 0) <= 0) { 660 ret = -1; 661 s->state = SSL_ST_ERR; 662 goto end; 663 } 664 665 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 666 sizeof(sctpauthkey), sctpauthkey); 667#endif 668 669 s->state = SSL3_ST_SR_CERT_VRFY_A; 670 s->init_num = 0; 671 672 if (ret == 2) { 673 /* 674 * For the ECDH ciphersuites when the client sends its ECDH 675 * pub key in a certificate, the CertificateVerify message is 676 * not sent. 677 */ 678 s->state = SSL3_ST_SR_FINISHED_A; 679 s->init_num = 0; 680 } else if (SSL_USE_SIGALGS(s)) { 681 s->state = SSL3_ST_SR_CERT_VRFY_A; 682 s->init_num = 0; 683 if (!s->session->peer) 684 break; 685 /* 686 * For sigalgs freeze the handshake buffer at this point and 687 * digest cached records. 688 */ 689 if (!s->s3->handshake_buffer) { 690 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 691 s->state = SSL_ST_ERR; 692 return -1; 693 } 694 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE; 695 if (!ssl3_digest_cached_records(s)) { 696 s->state = SSL_ST_ERR; 697 return -1; 698 } 699 } else { 700 s->state = SSL3_ST_SR_CERT_VRFY_A; 701 s->init_num = 0; 702 703 /* 704 * We need to get hashes here so if there is a client cert, 705 * it can be verified 706 */ 707 s->method->ssl3_enc->cert_verify_mac(s, 708 NID_md5, 709 &(s->s3-> 710 tmp.cert_verify_md 711 [0])); 712 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1, 713 &(s->s3-> 714 tmp.cert_verify_md 715 [MD5_DIGEST_LENGTH])); 716 } 717 break; 718 719 case SSL3_ST_SR_CERT_VRFY_A: 720 case SSL3_ST_SR_CERT_VRFY_B: 721 ret = ssl3_get_cert_verify(s); 722 if (ret <= 0) 723 goto end; 724#ifndef OPENSSL_NO_SCTP 725 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 726 state == SSL_ST_RENEGOTIATE) 727 s->state = DTLS1_SCTP_ST_SR_READ_SOCK; 728 else 729#endif 730 s->state = SSL3_ST_SR_FINISHED_A; 731 s->init_num = 0; 732 break; 733 734 case SSL3_ST_SR_FINISHED_A: 735 case SSL3_ST_SR_FINISHED_B: 736 /* 737 * Enable CCS. Receiving a CCS clears the flag, so make 738 * sure not to re-enable it to ban duplicates. This *should* be the 739 * first time we have received one - but we check anyway to be 740 * cautious. 741 * s->s3->change_cipher_spec is set when a CCS is 742 * processed in d1_pkt.c, and remains set until 743 * the client's Finished message is read. 744 */ 745 if (!s->s3->change_cipher_spec) 746 s->d1->change_cipher_spec_ok = 1; 747 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 748 SSL3_ST_SR_FINISHED_B); 749 if (ret <= 0) 750 goto end; 751 dtls1_stop_timer(s); 752 if (s->hit) 753 s->state = SSL_ST_OK; 754#ifndef OPENSSL_NO_TLSEXT 755 else if (s->tlsext_ticket_expected) 756 s->state = SSL3_ST_SW_SESSION_TICKET_A; 757#endif 758 else 759 s->state = SSL3_ST_SW_CHANGE_A; 760 s->init_num = 0; 761 break; 762 763#ifndef OPENSSL_NO_TLSEXT 764 case SSL3_ST_SW_SESSION_TICKET_A: 765 case SSL3_ST_SW_SESSION_TICKET_B: 766 ret = ssl3_send_newsession_ticket(s); 767 if (ret <= 0) 768 goto end; 769 s->state = SSL3_ST_SW_CHANGE_A; 770 s->init_num = 0; 771 break; 772 773 case SSL3_ST_SW_CERT_STATUS_A: 774 case SSL3_ST_SW_CERT_STATUS_B: 775 ret = ssl3_send_cert_status(s); 776 if (ret <= 0) 777 goto end; 778 s->state = SSL3_ST_SW_KEY_EXCH_A; 779 s->init_num = 0; 780 break; 781 782#endif 783 784 case SSL3_ST_SW_CHANGE_A: 785 case SSL3_ST_SW_CHANGE_B: 786 787 s->session->cipher = s->s3->tmp.new_cipher; 788 if (!s->method->ssl3_enc->setup_key_block(s)) { 789 ret = -1; 790 s->state = SSL_ST_ERR; 791 goto end; 792 } 793 794 ret = dtls1_send_change_cipher_spec(s, 795 SSL3_ST_SW_CHANGE_A, 796 SSL3_ST_SW_CHANGE_B); 797 798 if (ret <= 0) 799 goto end; 800 801#ifndef OPENSSL_NO_SCTP 802 if (!s->hit) { 803 /* 804 * Change to new shared key of SCTP-Auth, will be ignored if 805 * no SCTP used. 806 */ 807 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 808 0, NULL); 809 } 810#endif 811 812 s->state = SSL3_ST_SW_FINISHED_A; 813 s->init_num = 0; 814 815 if (!s->method->ssl3_enc->change_cipher_state(s, 816 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 817 { 818 ret = -1; 819 s->state = SSL_ST_ERR; 820 goto end; 821 } 822 823 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 824 break; 825 826 case SSL3_ST_SW_FINISHED_A: 827 case SSL3_ST_SW_FINISHED_B: 828 ret = ssl3_send_finished(s, 829 SSL3_ST_SW_FINISHED_A, 830 SSL3_ST_SW_FINISHED_B, 831 s->method-> 832 ssl3_enc->server_finished_label, 833 s->method-> 834 ssl3_enc->server_finished_label_len); 835 if (ret <= 0) 836 goto end; 837 s->state = SSL3_ST_SW_FLUSH; 838 if (s->hit) { 839 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A; 840 841#ifndef OPENSSL_NO_SCTP 842 /* 843 * Change to new shared key of SCTP-Auth, will be ignored if 844 * no SCTP used. 845 */ 846 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 847 0, NULL); 848#endif 849 } else { 850 s->s3->tmp.next_state = SSL_ST_OK; 851#ifndef OPENSSL_NO_SCTP 852 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 853 s->d1->next_state = s->s3->tmp.next_state; 854 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 855 } 856#endif 857 } 858 s->init_num = 0; 859 break; 860 861 case SSL_ST_OK: 862 /* clean a few things up */ 863 ssl3_cleanup_key_block(s); 864 865#if 0 866 BUF_MEM_free(s->init_buf); 867 s->init_buf = NULL; 868#endif 869 870 /* remove buffering on output */ 871 ssl_free_wbio_buffer(s); 872 873 s->init_num = 0; 874 875 if (s->renegotiate == 2) { /* skipped if we just sent a 876 * HelloRequest */ 877 s->renegotiate = 0; 878 s->new_session = 0; 879 880 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 881 882 s->ctx->stats.sess_accept_good++; 883 /* s->server=1; */ 884 s->handshake_func = dtls1_accept; 885 886 if (cb != NULL) 887 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 888 } 889 890 ret = 1; 891 892 /* done handshaking, next message is client hello */ 893 s->d1->handshake_read_seq = 0; 894 /* next message is server hello */ 895 s->d1->handshake_write_seq = 0; 896 s->d1->next_handshake_write_seq = 0; 897 dtls1_clear_received_buffer(s); 898 goto end; 899 /* break; */ 900 901 case SSL_ST_ERR: 902 default: 903 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE); 904 ret = -1; 905 goto end; 906 /* break; */ 907 } 908 909 if (!s->s3->tmp.reuse_message && !skip) { 910 if (s->debug) { 911 if ((ret = BIO_flush(s->wbio)) <= 0) 912 goto end; 913 } 914 915 if ((cb != NULL) && (s->state != state)) { 916 new_state = s->state; 917 s->state = state; 918 cb(s, SSL_CB_ACCEPT_LOOP, 1); 919 s->state = new_state; 920 } 921 } 922 skip = 0; 923 } 924 end: 925 /* BIO_flush(s->wbio); */ 926 927 s->in_handshake--; 928#ifndef OPENSSL_NO_SCTP 929 /* 930 * Notify SCTP BIO socket to leave handshake mode and prevent stream 931 * identifier other than 0. Will be ignored if no SCTP is used. 932 */ 933 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 934 s->in_handshake, NULL); 935#endif 936 937 if (cb != NULL) 938 cb(s, SSL_CB_ACCEPT_EXIT, ret); 939 return (ret); 940} 941 942int dtls1_send_hello_verify_request(SSL *s) 943{ 944 unsigned int msg_len; 945 unsigned char *msg, *buf, *p; 946 947 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 948 buf = (unsigned char *)s->init_buf->data; 949 950 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 951 /* Always use DTLS 1.0 version: see RFC 6347 */ 952 *(p++) = DTLS1_VERSION >> 8; 953 *(p++) = DTLS1_VERSION & 0xFF; 954 955 if (s->ctx->app_gen_cookie_cb == NULL || 956 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 957 &(s->d1->cookie_len)) == 0) { 958 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST, 959 ERR_R_INTERNAL_ERROR); 960 s->state = SSL_ST_ERR; 961 return 0; 962 } 963 964 *(p++) = (unsigned char)s->d1->cookie_len; 965 memcpy(p, s->d1->cookie, s->d1->cookie_len); 966 p += s->d1->cookie_len; 967 msg_len = p - msg; 968 969 dtls1_set_message_header(s, buf, 970 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, 971 msg_len); 972 973 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 974 /* number of bytes to write */ 975 s->init_num = p - buf; 976 s->init_off = 0; 977 } 978 979 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 980 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 981} 982