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 if (ver == DTLS1_2_VERSION) 137 return (DTLSv1_2_server_method()); 138 else 139 return (NULL); 140} 141 142IMPLEMENT_dtls1_meth_func(DTLS1_VERSION, 143 DTLSv1_server_method, 144 dtls1_accept, 145 ssl_undefined_function, 146 dtls1_get_server_method, DTLSv1_enc_data) 147 148 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION, 149 DTLSv1_2_server_method, 150 dtls1_accept, 151 ssl_undefined_function, 152 dtls1_get_server_method, DTLSv1_2_enc_data) 153 154 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION, 155 DTLS_server_method, 156 dtls1_accept, 157 ssl_undefined_function, 158 dtls1_get_server_method, DTLSv1_2_enc_data) 159 160int dtls1_accept(SSL *s) 161{ 162 BUF_MEM *buf; 163 unsigned long Time = (unsigned long)time(NULL); 164 void (*cb) (const SSL *ssl, int type, int val) = NULL; 165 unsigned long alg_k; 166 int ret = -1; 167 int new_state, state, skip = 0; 168 int listen; 169#ifndef OPENSSL_NO_SCTP 170 unsigned char sctpauthkey[64]; 171 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 172#endif 173 174 RAND_add(&Time, sizeof(Time), 0); 175 ERR_clear_error(); 176 clear_sys_error(); 177 178 if (s->info_callback != NULL) 179 cb = s->info_callback; 180 else if (s->ctx->info_callback != NULL) 181 cb = s->ctx->info_callback; 182 183 listen = s->d1->listen; 184 185 /* init things to blank */ 186 s->in_handshake++; 187 if (!SSL_in_init(s) || SSL_in_before(s)) 188 SSL_clear(s); 189 190 s->d1->listen = listen; 191#ifndef OPENSSL_NO_SCTP 192 /* 193 * Notify SCTP BIO socket to enter handshake mode and prevent stream 194 * identifier other than 0. Will be ignored if no SCTP is used. 195 */ 196 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 197 s->in_handshake, NULL); 198#endif 199 200 if (s->cert == NULL) { 201 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET); 202 return (-1); 203 } 204#ifndef OPENSSL_NO_HEARTBEATS 205 /* 206 * If we're awaiting a HeartbeatResponse, pretend we already got and 207 * don't await it anymore, because Heartbeats don't make sense during 208 * handshakes anyway. 209 */ 210 if (s->tlsext_hb_pending) { 211 dtls1_stop_timer(s); 212 s->tlsext_hb_pending = 0; 213 s->tlsext_hb_seq++; 214 } 215#endif 216 217 for (;;) { 218 state = s->state; 219 220 switch (s->state) { 221 case SSL_ST_RENEGOTIATE: 222 s->renegotiate = 1; 223 /* s->state=SSL_ST_ACCEPT; */ 224 225 case SSL_ST_BEFORE: 226 case SSL_ST_ACCEPT: 227 case SSL_ST_BEFORE | SSL_ST_ACCEPT: 228 case SSL_ST_OK | SSL_ST_ACCEPT: 229 230 s->server = 1; 231 if (cb != NULL) 232 cb(s, SSL_CB_HANDSHAKE_START, 1); 233 234 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { 235 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 236 return -1; 237 } 238 s->type = SSL_ST_ACCEPT; 239 240 if (s->init_buf == NULL) { 241 if ((buf = BUF_MEM_new()) == NULL) { 242 ret = -1; 243 s->state = SSL_ST_ERR; 244 goto end; 245 } 246 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 247 BUF_MEM_free(buf); 248 ret = -1; 249 s->state = SSL_ST_ERR; 250 goto end; 251 } 252 s->init_buf = buf; 253 } 254 255 if (!ssl3_setup_buffers(s)) { 256 ret = -1; 257 s->state = SSL_ST_ERR; 258 goto end; 259 } 260 261 s->init_num = 0; 262 s->d1->change_cipher_spec_ok = 0; 263 /* 264 * Should have been reset by ssl3_get_finished, too. 265 */ 266 s->s3->change_cipher_spec = 0; 267 268 if (s->state != SSL_ST_RENEGOTIATE) { 269 /* 270 * Ok, we now need to push on a buffering BIO so that the 271 * output is sent in a way that TCP likes :-) ...but not with 272 * SCTP :-) 273 */ 274#ifndef OPENSSL_NO_SCTP 275 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) 276#endif 277 if (!ssl_init_wbio_buffer(s, 1)) { 278 ret = -1; 279 s->state = SSL_ST_ERR; 280 goto end; 281 } 282 283 ssl3_init_finished_mac(s); 284 s->state = SSL3_ST_SR_CLNT_HELLO_A; 285 s->ctx->stats.sess_accept++; 286 } else { 287 /* 288 * s->state == SSL_ST_RENEGOTIATE, we will just send a 289 * HelloRequest 290 */ 291 s->ctx->stats.sess_accept_renegotiate++; 292 s->state = SSL3_ST_SW_HELLO_REQ_A; 293 } 294 295 break; 296 297 case SSL3_ST_SW_HELLO_REQ_A: 298 case SSL3_ST_SW_HELLO_REQ_B: 299 300 s->shutdown = 0; 301 dtls1_clear_record_buffer(s); 302 dtls1_start_timer(s); 303 ret = ssl3_send_hello_request(s); 304 if (ret <= 0) 305 goto end; 306 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 307 s->state = SSL3_ST_SW_FLUSH; 308 s->init_num = 0; 309 310 ssl3_init_finished_mac(s); 311 break; 312 313 case SSL3_ST_SW_HELLO_REQ_C: 314 s->state = SSL_ST_OK; 315 break; 316 317 case SSL3_ST_SR_CLNT_HELLO_A: 318 case SSL3_ST_SR_CLNT_HELLO_B: 319 case SSL3_ST_SR_CLNT_HELLO_C: 320 321 s->shutdown = 0; 322 ret = ssl3_get_client_hello(s); 323 if (ret <= 0) 324 goto end; 325 dtls1_stop_timer(s); 326 327 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 328 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 329 else 330 s->state = SSL3_ST_SW_SRVR_HELLO_A; 331 332 s->init_num = 0; 333 334 /* 335 * Reflect ClientHello sequence to remain stateless while 336 * listening 337 */ 338 if (listen) { 339 memcpy(s->s3->write_sequence, s->s3->read_sequence, 340 sizeof(s->s3->write_sequence)); 341 } 342 343 /* If we're just listening, stop here */ 344 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) { 345 ret = 2; 346 s->d1->listen = 0; 347 /* 348 * Set expected sequence numbers to continue the handshake. 349 */ 350 s->d1->handshake_read_seq = 2; 351 s->d1->handshake_write_seq = 1; 352 s->d1->next_handshake_write_seq = 1; 353 goto end; 354 } 355 356 break; 357 358 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 359 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 360 361 ret = dtls1_send_hello_verify_request(s); 362 if (ret <= 0) 363 goto end; 364 s->state = SSL3_ST_SW_FLUSH; 365 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 366 367 /* HelloVerifyRequest resets Finished MAC */ 368 if (s->version != DTLS1_BAD_VER) 369 ssl3_init_finished_mac(s); 370 break; 371 372#ifndef OPENSSL_NO_SCTP 373 case DTLS1_SCTP_ST_SR_READ_SOCK: 374 375 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { 376 s->s3->in_read_app_data = 2; 377 s->rwstate = SSL_READING; 378 BIO_clear_retry_flags(SSL_get_rbio(s)); 379 BIO_set_retry_read(SSL_get_rbio(s)); 380 ret = -1; 381 goto end; 382 } 383 384 s->state = SSL3_ST_SR_FINISHED_A; 385 break; 386 387 case DTLS1_SCTP_ST_SW_WRITE_SOCK: 388 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 389 if (ret < 0) 390 goto end; 391 392 if (ret == 0) { 393 if (s->d1->next_state != SSL_ST_OK) { 394 s->s3->in_read_app_data = 2; 395 s->rwstate = SSL_READING; 396 BIO_clear_retry_flags(SSL_get_rbio(s)); 397 BIO_set_retry_read(SSL_get_rbio(s)); 398 ret = -1; 399 goto end; 400 } 401 } 402 403 s->state = s->d1->next_state; 404 break; 405#endif 406 407 case SSL3_ST_SW_SRVR_HELLO_A: 408 case SSL3_ST_SW_SRVR_HELLO_B: 409 s->renegotiate = 2; 410 dtls1_start_timer(s); 411 ret = ssl3_send_server_hello(s); 412 if (ret <= 0) 413 goto end; 414 415 if (s->hit) { 416#ifndef OPENSSL_NO_SCTP 417 /* 418 * Add new shared key for SCTP-Auth, will be ignored if no 419 * SCTP used. 420 */ 421 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 422 DTLS1_SCTP_AUTH_LABEL); 423 424 SSL_export_keying_material(s, sctpauthkey, 425 sizeof(sctpauthkey), labelbuffer, 426 sizeof(labelbuffer), NULL, 0, 0); 427 428 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 429 sizeof(sctpauthkey), sctpauthkey); 430#endif 431#ifndef OPENSSL_NO_TLSEXT 432 if (s->tlsext_ticket_expected) 433 s->state = SSL3_ST_SW_SESSION_TICKET_A; 434 else 435 s->state = SSL3_ST_SW_CHANGE_A; 436#else 437 s->state = SSL3_ST_SW_CHANGE_A; 438#endif 439 } else 440 s->state = SSL3_ST_SW_CERT_A; 441 s->init_num = 0; 442 break; 443 444 case SSL3_ST_SW_CERT_A: 445 case SSL3_ST_SW_CERT_B: 446 /* Check if it is anon DH or normal PSK */ 447 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 448 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 449 dtls1_start_timer(s); 450 ret = ssl3_send_server_certificate(s); 451 if (ret <= 0) 452 goto end; 453#ifndef OPENSSL_NO_TLSEXT 454 if (s->tlsext_status_expected) 455 s->state = SSL3_ST_SW_CERT_STATUS_A; 456 else 457 s->state = SSL3_ST_SW_KEY_EXCH_A; 458 } else { 459 skip = 1; 460 s->state = SSL3_ST_SW_KEY_EXCH_A; 461 } 462#else 463 } else 464 skip = 1; 465 466 s->state = SSL3_ST_SW_KEY_EXCH_A; 467#endif 468 s->init_num = 0; 469 break; 470 471 case SSL3_ST_SW_KEY_EXCH_A: 472 case SSL3_ST_SW_KEY_EXCH_B: 473 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 474 475 /* 476 * clear this, it may get reset by 477 * send_server_key_exchange 478 */ 479 s->s3->tmp.use_rsa_tmp = 0; 480 481 /* 482 * only send if a DH key exchange or RSA but we have a sign only 483 * certificate 484 */ 485 if (0 486 /* 487 * PSK: send ServerKeyExchange if PSK identity hint if 488 * provided 489 */ 490#ifndef OPENSSL_NO_PSK 491 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) 492#endif 493 || (alg_k & SSL_kDHE) 494 || (alg_k & SSL_kEECDH) 495 || ((alg_k & SSL_kRSA) 496 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 497 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 498 && EVP_PKEY_size(s->cert->pkeys 499 [SSL_PKEY_RSA_ENC].privatekey) * 500 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 501 ) 502 ) 503 ) 504 ) { 505 dtls1_start_timer(s); 506 ret = ssl3_send_server_key_exchange(s); 507 if (ret <= 0) 508 goto end; 509 } else 510 skip = 1; 511 512 s->state = SSL3_ST_SW_CERT_REQ_A; 513 s->init_num = 0; 514 break; 515 516 case SSL3_ST_SW_CERT_REQ_A: 517 case SSL3_ST_SW_CERT_REQ_B: 518 if ( /* don't request cert unless asked for it: */ 519 !(s->verify_mode & SSL_VERIFY_PEER) || 520 /* 521 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert 522 * during re-negotiation: 523 */ 524 ((s->session->peer != NULL) && 525 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 526 /* 527 * never request cert in anonymous ciphersuites (see 528 * section "Certificate request" in SSL 3 drafts and in 529 * RFC 2246): 530 */ 531 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 532 /* 533 * ... except when the application insists on 534 * verification (against the specs, but s3_clnt.c accepts 535 * this for SSL 3) 536 */ 537 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 538 /* 539 * never request cert in Kerberos ciphersuites 540 */ 541 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 542 /* 543 * With normal PSK Certificates and Certificate Requests 544 * are omitted 545 */ 546 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 547 /* no cert request */ 548 skip = 1; 549 s->s3->tmp.cert_request = 0; 550 s->state = SSL3_ST_SW_SRVR_DONE_A; 551#ifndef OPENSSL_NO_SCTP 552 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 553 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 554 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 555 } 556#endif 557 } else { 558 s->s3->tmp.cert_request = 1; 559 dtls1_start_timer(s); 560 ret = ssl3_send_certificate_request(s); 561 if (ret <= 0) 562 goto end; 563#ifndef NETSCAPE_HANG_BUG 564 s->state = SSL3_ST_SW_SRVR_DONE_A; 565# ifndef OPENSSL_NO_SCTP 566 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 567 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 568 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 569 } 570# endif 571#else 572 s->state = SSL3_ST_SW_FLUSH; 573 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 574# ifndef OPENSSL_NO_SCTP 575 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 576 s->d1->next_state = s->s3->tmp.next_state; 577 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 578 } 579# endif 580#endif 581 s->init_num = 0; 582 } 583 break; 584 585 case SSL3_ST_SW_SRVR_DONE_A: 586 case SSL3_ST_SW_SRVR_DONE_B: 587 dtls1_start_timer(s); 588 ret = ssl3_send_server_done(s); 589 if (ret <= 0) 590 goto end; 591 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 592 s->state = SSL3_ST_SW_FLUSH; 593 s->init_num = 0; 594 break; 595 596 case SSL3_ST_SW_FLUSH: 597 s->rwstate = SSL_WRITING; 598 if (BIO_flush(s->wbio) <= 0) { 599 /* 600 * If the write error was fatal, stop trying 601 */ 602 if (!BIO_should_retry(s->wbio)) { 603 s->rwstate = SSL_NOTHING; 604 s->state = s->s3->tmp.next_state; 605 } 606 607 ret = -1; 608 goto end; 609 } 610 s->rwstate = SSL_NOTHING; 611 s->state = s->s3->tmp.next_state; 612 break; 613 614 case SSL3_ST_SR_CERT_A: 615 case SSL3_ST_SR_CERT_B: 616 if (s->s3->tmp.cert_request) { 617 ret = ssl3_get_client_certificate(s); 618 if (ret <= 0) 619 goto end; 620 } 621 s->init_num = 0; 622 s->state = SSL3_ST_SR_KEY_EXCH_A; 623 break; 624 625 case SSL3_ST_SR_KEY_EXCH_A: 626 case SSL3_ST_SR_KEY_EXCH_B: 627 ret = ssl3_get_client_key_exchange(s); 628 if (ret <= 0) 629 goto end; 630#ifndef OPENSSL_NO_SCTP 631 /* 632 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 633 * used. 634 */ 635 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 636 DTLS1_SCTP_AUTH_LABEL); 637 638 SSL_export_keying_material(s, sctpauthkey, 639 sizeof(sctpauthkey), labelbuffer, 640 sizeof(labelbuffer), NULL, 0, 0); 641 642 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 643 sizeof(sctpauthkey), sctpauthkey); 644#endif 645 646 s->state = SSL3_ST_SR_CERT_VRFY_A; 647 s->init_num = 0; 648 649 if (ret == 2) { 650 /* 651 * For the ECDH ciphersuites when the client sends its ECDH 652 * pub key in a certificate, the CertificateVerify message is 653 * not sent. 654 */ 655 s->state = SSL3_ST_SR_FINISHED_A; 656 s->init_num = 0; 657 } else if (SSL_USE_SIGALGS(s)) { 658 s->state = SSL3_ST_SR_CERT_VRFY_A; 659 s->init_num = 0; 660 if (!s->session->peer) 661 break; 662 /* 663 * For sigalgs freeze the handshake buffer at this point and 664 * digest cached records. 665 */ 666 if (!s->s3->handshake_buffer) { 667 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 668 s->state = SSL_ST_ERR; 669 return -1; 670 } 671 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE; 672 if (!ssl3_digest_cached_records(s)) { 673 s->state = SSL_ST_ERR; 674 return -1; 675 } 676 } else { 677 s->state = SSL3_ST_SR_CERT_VRFY_A; 678 s->init_num = 0; 679 680 /* 681 * We need to get hashes here so if there is a client cert, 682 * it can be verified 683 */ 684 s->method->ssl3_enc->cert_verify_mac(s, 685 NID_md5, 686 &(s->s3-> 687 tmp.cert_verify_md 688 [0])); 689 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1, 690 &(s->s3-> 691 tmp.cert_verify_md 692 [MD5_DIGEST_LENGTH])); 693 } 694 break; 695 696 case SSL3_ST_SR_CERT_VRFY_A: 697 case SSL3_ST_SR_CERT_VRFY_B: 698 ret = ssl3_get_cert_verify(s); 699 if (ret <= 0) 700 goto end; 701#ifndef OPENSSL_NO_SCTP 702 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 703 state == SSL_ST_RENEGOTIATE) 704 s->state = DTLS1_SCTP_ST_SR_READ_SOCK; 705 else 706#endif 707 s->state = SSL3_ST_SR_FINISHED_A; 708 s->init_num = 0; 709 break; 710 711 case SSL3_ST_SR_FINISHED_A: 712 case SSL3_ST_SR_FINISHED_B: 713 /* 714 * Enable CCS. Receiving a CCS clears the flag, so make 715 * sure not to re-enable it to ban duplicates. This *should* be the 716 * first time we have received one - but we check anyway to be 717 * cautious. 718 * s->s3->change_cipher_spec is set when a CCS is 719 * processed in d1_pkt.c, and remains set until 720 * the client's Finished message is read. 721 */ 722 if (!s->s3->change_cipher_spec) 723 s->d1->change_cipher_spec_ok = 1; 724 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 725 SSL3_ST_SR_FINISHED_B); 726 if (ret <= 0) 727 goto end; 728 dtls1_stop_timer(s); 729 if (s->hit) 730 s->state = SSL_ST_OK; 731#ifndef OPENSSL_NO_TLSEXT 732 else if (s->tlsext_ticket_expected) 733 s->state = SSL3_ST_SW_SESSION_TICKET_A; 734#endif 735 else 736 s->state = SSL3_ST_SW_CHANGE_A; 737 s->init_num = 0; 738 break; 739 740#ifndef OPENSSL_NO_TLSEXT 741 case SSL3_ST_SW_SESSION_TICKET_A: 742 case SSL3_ST_SW_SESSION_TICKET_B: 743 ret = ssl3_send_newsession_ticket(s); 744 if (ret <= 0) 745 goto end; 746 s->state = SSL3_ST_SW_CHANGE_A; 747 s->init_num = 0; 748 break; 749 750 case SSL3_ST_SW_CERT_STATUS_A: 751 case SSL3_ST_SW_CERT_STATUS_B: 752 ret = ssl3_send_cert_status(s); 753 if (ret <= 0) 754 goto end; 755 s->state = SSL3_ST_SW_KEY_EXCH_A; 756 s->init_num = 0; 757 break; 758 759#endif 760 761 case SSL3_ST_SW_CHANGE_A: 762 case SSL3_ST_SW_CHANGE_B: 763 764 s->session->cipher = s->s3->tmp.new_cipher; 765 if (!s->method->ssl3_enc->setup_key_block(s)) { 766 ret = -1; 767 s->state = SSL_ST_ERR; 768 goto end; 769 } 770 771 ret = dtls1_send_change_cipher_spec(s, 772 SSL3_ST_SW_CHANGE_A, 773 SSL3_ST_SW_CHANGE_B); 774 775 if (ret <= 0) 776 goto end; 777 778#ifndef OPENSSL_NO_SCTP 779 if (!s->hit) { 780 /* 781 * Change to new shared key of SCTP-Auth, will be ignored if 782 * no SCTP used. 783 */ 784 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 785 0, NULL); 786 } 787#endif 788 789 s->state = SSL3_ST_SW_FINISHED_A; 790 s->init_num = 0; 791 792 if (!s->method->ssl3_enc->change_cipher_state(s, 793 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 794 { 795 ret = -1; 796 s->state = SSL_ST_ERR; 797 goto end; 798 } 799 800 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 801 break; 802 803 case SSL3_ST_SW_FINISHED_A: 804 case SSL3_ST_SW_FINISHED_B: 805 ret = ssl3_send_finished(s, 806 SSL3_ST_SW_FINISHED_A, 807 SSL3_ST_SW_FINISHED_B, 808 s->method-> 809 ssl3_enc->server_finished_label, 810 s->method-> 811 ssl3_enc->server_finished_label_len); 812 if (ret <= 0) 813 goto end; 814 s->state = SSL3_ST_SW_FLUSH; 815 if (s->hit) { 816 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A; 817 818#ifndef OPENSSL_NO_SCTP 819 /* 820 * Change to new shared key of SCTP-Auth, will be ignored if 821 * no SCTP used. 822 */ 823 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 824 0, NULL); 825#endif 826 } else { 827 s->s3->tmp.next_state = SSL_ST_OK; 828#ifndef OPENSSL_NO_SCTP 829 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 830 s->d1->next_state = s->s3->tmp.next_state; 831 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 832 } 833#endif 834 } 835 s->init_num = 0; 836 break; 837 838 case SSL_ST_OK: 839 /* clean a few things up */ 840 ssl3_cleanup_key_block(s); 841 842#if 0 843 BUF_MEM_free(s->init_buf); 844 s->init_buf = NULL; 845#endif 846 847 /* remove buffering on output */ 848 ssl_free_wbio_buffer(s); 849 850 s->init_num = 0; 851 852 if (s->renegotiate == 2) { /* skipped if we just sent a 853 * HelloRequest */ 854 s->renegotiate = 0; 855 s->new_session = 0; 856 857 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 858 859 s->ctx->stats.sess_accept_good++; 860 /* s->server=1; */ 861 s->handshake_func = dtls1_accept; 862 863 if (cb != NULL) 864 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 865 } 866 867 ret = 1; 868 869 /* done handshaking, next message is client hello */ 870 s->d1->handshake_read_seq = 0; 871 /* next message is server hello */ 872 s->d1->handshake_write_seq = 0; 873 s->d1->next_handshake_write_seq = 0; 874 goto end; 875 /* break; */ 876 877 case SSL_ST_ERR: 878 default: 879 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE); 880 ret = -1; 881 goto end; 882 /* break; */ 883 } 884 885 if (!s->s3->tmp.reuse_message && !skip) { 886 if (s->debug) { 887 if ((ret = BIO_flush(s->wbio)) <= 0) 888 goto end; 889 } 890 891 if ((cb != NULL) && (s->state != state)) { 892 new_state = s->state; 893 s->state = state; 894 cb(s, SSL_CB_ACCEPT_LOOP, 1); 895 s->state = new_state; 896 } 897 } 898 skip = 0; 899 } 900 end: 901 /* BIO_flush(s->wbio); */ 902 903 s->in_handshake--; 904#ifndef OPENSSL_NO_SCTP 905 /* 906 * Notify SCTP BIO socket to leave handshake mode and prevent stream 907 * identifier other than 0. Will be ignored if no SCTP is used. 908 */ 909 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 910 s->in_handshake, NULL); 911#endif 912 913 if (cb != NULL) 914 cb(s, SSL_CB_ACCEPT_EXIT, ret); 915 return (ret); 916} 917 918int dtls1_send_hello_verify_request(SSL *s) 919{ 920 unsigned int msg_len; 921 unsigned char *msg, *buf, *p; 922 923 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 924 buf = (unsigned char *)s->init_buf->data; 925 926 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 927 /* Always use DTLS 1.0 version: see RFC 6347 */ 928 *(p++) = DTLS1_VERSION >> 8; 929 *(p++) = DTLS1_VERSION & 0xFF; 930 931 if (s->ctx->app_gen_cookie_cb == NULL || 932 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 933 &(s->d1->cookie_len)) == 0) { 934 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST, 935 ERR_R_INTERNAL_ERROR); 936 s->state = SSL_ST_ERR; 937 return 0; 938 } 939 940 *(p++) = (unsigned char)s->d1->cookie_len; 941 memcpy(p, s->d1->cookie, s->d1->cookie_len); 942 p += s->d1->cookie_len; 943 msg_len = p - msg; 944 945 dtls1_set_message_header(s, buf, 946 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, 947 msg_len); 948 949 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 950 /* number of bytes to write */ 951 s->init_num = p - buf; 952 s->init_off = 0; 953 } 954 955 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 956 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 957} 958