d1_srvr.c revision 291721
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, dtls1_get_server_method) 143 144int dtls1_accept(SSL *s) 145{ 146 BUF_MEM *buf; 147 unsigned long Time = (unsigned long)time(NULL); 148 void (*cb) (const SSL *ssl, int type, int val) = NULL; 149 unsigned long alg_k; 150 int ret = -1; 151 int new_state, state, skip = 0; 152 int listen; 153#ifndef OPENSSL_NO_SCTP 154 unsigned char sctpauthkey[64]; 155 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 156#endif 157 158 RAND_add(&Time, sizeof(Time), 0); 159 ERR_clear_error(); 160 clear_sys_error(); 161 162 if (s->info_callback != NULL) 163 cb = s->info_callback; 164 else if (s->ctx->info_callback != NULL) 165 cb = s->ctx->info_callback; 166 167 listen = s->d1->listen; 168 169 /* init things to blank */ 170 s->in_handshake++; 171 if (!SSL_in_init(s) || SSL_in_before(s)) 172 SSL_clear(s); 173 174 s->d1->listen = listen; 175#ifndef OPENSSL_NO_SCTP 176 /* 177 * Notify SCTP BIO socket to enter handshake mode and prevent stream 178 * identifier other than 0. Will be ignored if no SCTP is used. 179 */ 180 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 181 s->in_handshake, NULL); 182#endif 183 184 if (s->cert == NULL) { 185 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_NO_CERTIFICATE_SET); 186 return (-1); 187 } 188#ifndef OPENSSL_NO_HEARTBEATS 189 /* 190 * If we're awaiting a HeartbeatResponse, pretend we already got and 191 * don't await it anymore, because Heartbeats don't make sense during 192 * handshakes anyway. 193 */ 194 if (s->tlsext_hb_pending) { 195 dtls1_stop_timer(s); 196 s->tlsext_hb_pending = 0; 197 s->tlsext_hb_seq++; 198 } 199#endif 200 201 for (;;) { 202 state = s->state; 203 204 switch (s->state) { 205 case SSL_ST_RENEGOTIATE: 206 s->renegotiate = 1; 207 /* s->state=SSL_ST_ACCEPT; */ 208 209 case SSL_ST_BEFORE: 210 case SSL_ST_ACCEPT: 211 case SSL_ST_BEFORE | SSL_ST_ACCEPT: 212 case SSL_ST_OK | SSL_ST_ACCEPT: 213 214 s->server = 1; 215 if (cb != NULL) 216 cb(s, SSL_CB_HANDSHAKE_START, 1); 217 218 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) { 219 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 220 return -1; 221 } 222 s->type = SSL_ST_ACCEPT; 223 224 if (s->init_buf == NULL) { 225 if ((buf = BUF_MEM_new()) == NULL) { 226 ret = -1; 227 s->state = SSL_ST_ERR; 228 goto end; 229 } 230 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { 231 BUF_MEM_free(buf); 232 ret = -1; 233 s->state = SSL_ST_ERR; 234 goto end; 235 } 236 s->init_buf = buf; 237 } 238 239 if (!ssl3_setup_buffers(s)) { 240 ret = -1; 241 s->state = SSL_ST_ERR; 242 goto end; 243 } 244 245 s->init_num = 0; 246 s->d1->change_cipher_spec_ok = 0; 247 /* 248 * Should have been reset by ssl3_get_finished, too. 249 */ 250 s->s3->change_cipher_spec = 0; 251 252 if (s->state != SSL_ST_RENEGOTIATE) { 253 /* 254 * Ok, we now need to push on a buffering BIO so that the 255 * output is sent in a way that TCP likes :-) ...but not with 256 * SCTP :-) 257 */ 258#ifndef OPENSSL_NO_SCTP 259 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) 260#endif 261 if (!ssl_init_wbio_buffer(s, 1)) { 262 ret = -1; 263 s->state = SSL_ST_ERR; 264 goto end; 265 } 266 267 ssl3_init_finished_mac(s); 268 s->state = SSL3_ST_SR_CLNT_HELLO_A; 269 s->ctx->stats.sess_accept++; 270 } else if (!s->s3->send_connection_binding && 271 !(s->options & 272 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)) { 273 /* 274 * Server attempting to renegotiate with client that doesn't 275 * support secure renegotiation. 276 */ 277 SSLerr(SSL_F_DTLS1_ACCEPT, 278 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED); 279 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE); 280 ret = -1; 281 s->state = SSL_ST_ERR; 282 goto end; 283 } else { 284 /* 285 * s->state == SSL_ST_RENEGOTIATE, we will just send a 286 * HelloRequest 287 */ 288 s->ctx->stats.sess_accept_renegotiate++; 289 s->state = SSL3_ST_SW_HELLO_REQ_A; 290 } 291 292 break; 293 294 case SSL3_ST_SW_HELLO_REQ_A: 295 case SSL3_ST_SW_HELLO_REQ_B: 296 297 s->shutdown = 0; 298 dtls1_clear_record_buffer(s); 299 dtls1_start_timer(s); 300 ret = dtls1_send_hello_request(s); 301 if (ret <= 0) 302 goto end; 303 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 304 s->state = SSL3_ST_SW_FLUSH; 305 s->init_num = 0; 306 307 ssl3_init_finished_mac(s); 308 break; 309 310 case SSL3_ST_SW_HELLO_REQ_C: 311 s->state = SSL_ST_OK; 312 break; 313 314 case SSL3_ST_SR_CLNT_HELLO_A: 315 case SSL3_ST_SR_CLNT_HELLO_B: 316 case SSL3_ST_SR_CLNT_HELLO_C: 317 318 s->shutdown = 0; 319 ret = ssl3_get_client_hello(s); 320 if (ret <= 0) 321 goto end; 322 dtls1_stop_timer(s); 323 324 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 325 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 326 else 327 s->state = SSL3_ST_SW_SRVR_HELLO_A; 328 329 s->init_num = 0; 330 331 /* 332 * Reflect ClientHello sequence to remain stateless while 333 * listening 334 */ 335 if (listen) { 336 memcpy(s->s3->write_sequence, s->s3->read_sequence, 337 sizeof(s->s3->write_sequence)); 338 } 339 340 /* If we're just listening, stop here */ 341 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) { 342 ret = 2; 343 s->d1->listen = 0; 344 /* 345 * Set expected sequence numbers to continue the handshake. 346 */ 347 s->d1->handshake_read_seq = 2; 348 s->d1->handshake_write_seq = 1; 349 s->d1->next_handshake_write_seq = 1; 350 goto end; 351 } 352 353 break; 354 355 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 356 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 357 358 ret = dtls1_send_hello_verify_request(s); 359 if (ret <= 0) 360 goto end; 361 s->state = SSL3_ST_SW_FLUSH; 362 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 363 364 /* HelloVerifyRequest resets Finished MAC */ 365 if (s->version != DTLS1_BAD_VER) 366 ssl3_init_finished_mac(s); 367 break; 368 369#ifndef OPENSSL_NO_SCTP 370 case DTLS1_SCTP_ST_SR_READ_SOCK: 371 372 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { 373 s->s3->in_read_app_data = 2; 374 s->rwstate = SSL_READING; 375 BIO_clear_retry_flags(SSL_get_rbio(s)); 376 BIO_set_retry_read(SSL_get_rbio(s)); 377 ret = -1; 378 goto end; 379 } 380 381 s->state = SSL3_ST_SR_FINISHED_A; 382 break; 383 384 case DTLS1_SCTP_ST_SW_WRITE_SOCK: 385 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 386 if (ret < 0) 387 goto end; 388 389 if (ret == 0) { 390 if (s->d1->next_state != SSL_ST_OK) { 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 } 399 400 s->state = s->d1->next_state; 401 break; 402#endif 403 404 case SSL3_ST_SW_SRVR_HELLO_A: 405 case SSL3_ST_SW_SRVR_HELLO_B: 406 s->renegotiate = 2; 407 dtls1_start_timer(s); 408 ret = dtls1_send_server_hello(s); 409 if (ret <= 0) 410 goto end; 411 412 if (s->hit) { 413#ifndef OPENSSL_NO_SCTP 414 /* 415 * Add new shared key for SCTP-Auth, will be ignored if no 416 * SCTP used. 417 */ 418 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 419 DTLS1_SCTP_AUTH_LABEL); 420 421 if (SSL_export_keying_material(s, sctpauthkey, 422 sizeof(sctpauthkey), labelbuffer, 423 sizeof(labelbuffer), NULL, 0, 0) <= 0) { 424 ret = -1; 425 s->state = SSL_ST_ERR; 426 goto end; 427 } 428 429 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 430 sizeof(sctpauthkey), sctpauthkey); 431#endif 432#ifndef OPENSSL_NO_TLSEXT 433 if (s->tlsext_ticket_expected) 434 s->state = SSL3_ST_SW_SESSION_TICKET_A; 435 else 436 s->state = SSL3_ST_SW_CHANGE_A; 437#else 438 s->state = SSL3_ST_SW_CHANGE_A; 439#endif 440 } else 441 s->state = SSL3_ST_SW_CERT_A; 442 s->init_num = 0; 443 break; 444 445 case SSL3_ST_SW_CERT_A: 446 case SSL3_ST_SW_CERT_B: 447 /* Check if it is anon DH or normal PSK */ 448 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 449 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 450 dtls1_start_timer(s); 451 ret = dtls1_send_server_certificate(s); 452 if (ret <= 0) 453 goto end; 454#ifndef OPENSSL_NO_TLSEXT 455 if (s->tlsext_status_expected) 456 s->state = SSL3_ST_SW_CERT_STATUS_A; 457 else 458 s->state = SSL3_ST_SW_KEY_EXCH_A; 459 } else { 460 skip = 1; 461 s->state = SSL3_ST_SW_KEY_EXCH_A; 462 } 463#else 464 } else 465 skip = 1; 466 467 s->state = SSL3_ST_SW_KEY_EXCH_A; 468#endif 469 s->init_num = 0; 470 break; 471 472 case SSL3_ST_SW_KEY_EXCH_A: 473 case SSL3_ST_SW_KEY_EXCH_B: 474 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 475 476 /* 477 * clear this, it may get reset by 478 * send_server_key_exchange 479 */ 480 s->s3->tmp.use_rsa_tmp = 0; 481 482 /* 483 * only send if a DH key exchange or RSA but we have a sign only 484 * certificate 485 */ 486 if (0 487 /* 488 * PSK: send ServerKeyExchange if PSK identity hint if 489 * provided 490 */ 491#ifndef OPENSSL_NO_PSK 492 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) 493#endif 494 || (alg_k & SSL_kEDH) 495 || (alg_k & SSL_kEECDH) 496 || ((alg_k & SSL_kRSA) 497 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 498 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 499 && EVP_PKEY_size(s->cert->pkeys 500 [SSL_PKEY_RSA_ENC].privatekey) * 501 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 502 ) 503 ) 504 ) 505 ) { 506 dtls1_start_timer(s); 507 ret = dtls1_send_server_key_exchange(s); 508 if (ret <= 0) 509 goto end; 510 } else 511 skip = 1; 512 513 s->state = SSL3_ST_SW_CERT_REQ_A; 514 s->init_num = 0; 515 break; 516 517 case SSL3_ST_SW_CERT_REQ_A: 518 case SSL3_ST_SW_CERT_REQ_B: 519 if ( /* don't request cert unless asked for it: */ 520 !(s->verify_mode & SSL_VERIFY_PEER) || 521 /* 522 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert 523 * during re-negotiation: 524 */ 525 ((s->session->peer != NULL) && 526 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 527 /* 528 * never request cert in anonymous ciphersuites (see 529 * section "Certificate request" in SSL 3 drafts and in 530 * RFC 2246): 531 */ 532 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 533 /* 534 * ... except when the application insists on 535 * verification (against the specs, but s3_clnt.c accepts 536 * this for SSL 3) 537 */ 538 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 539 /* 540 * never request cert in Kerberos ciphersuites 541 */ 542 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 543 /* 544 * With normal PSK Certificates and Certificate Requests 545 * are omitted 546 */ 547 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 548 /* no cert request */ 549 skip = 1; 550 s->s3->tmp.cert_request = 0; 551 s->state = SSL3_ST_SW_SRVR_DONE_A; 552#ifndef OPENSSL_NO_SCTP 553 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 554 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 555 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 556 } 557#endif 558 } else { 559 s->s3->tmp.cert_request = 1; 560 dtls1_start_timer(s); 561 ret = dtls1_send_certificate_request(s); 562 if (ret <= 0) 563 goto end; 564#ifndef NETSCAPE_HANG_BUG 565 s->state = SSL3_ST_SW_SRVR_DONE_A; 566# ifndef OPENSSL_NO_SCTP 567 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 568 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 569 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 570 } 571# endif 572#else 573 s->state = SSL3_ST_SW_FLUSH; 574 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 575# ifndef OPENSSL_NO_SCTP 576 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 577 s->d1->next_state = s->s3->tmp.next_state; 578 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 579 } 580# endif 581#endif 582 s->init_num = 0; 583 } 584 break; 585 586 case SSL3_ST_SW_SRVR_DONE_A: 587 case SSL3_ST_SW_SRVR_DONE_B: 588 dtls1_start_timer(s); 589 ret = dtls1_send_server_done(s); 590 if (ret <= 0) 591 goto end; 592 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 593 s->state = SSL3_ST_SW_FLUSH; 594 s->init_num = 0; 595 break; 596 597 case SSL3_ST_SW_FLUSH: 598 s->rwstate = SSL_WRITING; 599 if (BIO_flush(s->wbio) <= 0) { 600 /* 601 * If the write error was fatal, stop trying 602 */ 603 if (!BIO_should_retry(s->wbio)) { 604 s->rwstate = SSL_NOTHING; 605 s->state = s->s3->tmp.next_state; 606 } 607 608 ret = -1; 609 goto end; 610 } 611 s->rwstate = SSL_NOTHING; 612 s->state = s->s3->tmp.next_state; 613 break; 614 615 case SSL3_ST_SR_CERT_A: 616 case SSL3_ST_SR_CERT_B: 617 /* Check for second client hello (MS SGC) */ 618 ret = ssl3_check_client_hello(s); 619 if (ret <= 0) 620 goto end; 621 if (ret == 2) { 622 dtls1_stop_timer(s); 623 s->state = SSL3_ST_SR_CLNT_HELLO_C; 624 } else { 625 if (s->s3->tmp.cert_request) { 626 ret = ssl3_get_client_certificate(s); 627 if (ret <= 0) 628 goto end; 629 } 630 s->init_num = 0; 631 s->state = SSL3_ST_SR_KEY_EXCH_A; 632 } 633 break; 634 635 case SSL3_ST_SR_KEY_EXCH_A: 636 case SSL3_ST_SR_KEY_EXCH_B: 637 ret = ssl3_get_client_key_exchange(s); 638 if (ret <= 0) 639 goto end; 640#ifndef OPENSSL_NO_SCTP 641 /* 642 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 643 * used. 644 */ 645 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 646 DTLS1_SCTP_AUTH_LABEL); 647 648 if (SSL_export_keying_material(s, sctpauthkey, 649 sizeof(sctpauthkey), labelbuffer, 650 sizeof(labelbuffer), NULL, 0, 0) <= 0) { 651 ret = -1; 652 s->state = SSL_ST_ERR; 653 goto end; 654 } 655 656 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 657 sizeof(sctpauthkey), sctpauthkey); 658#endif 659 660 s->state = SSL3_ST_SR_CERT_VRFY_A; 661 s->init_num = 0; 662 663 if (ret == 2) { 664 /* 665 * For the ECDH ciphersuites when the client sends its ECDH 666 * pub key in a certificate, the CertificateVerify message is 667 * not sent. 668 */ 669 s->state = SSL3_ST_SR_FINISHED_A; 670 s->init_num = 0; 671 } else { 672 s->state = SSL3_ST_SR_CERT_VRFY_A; 673 s->init_num = 0; 674 675 /* 676 * We need to get hashes here so if there is a client cert, 677 * it can be verified 678 */ 679 s->method->ssl3_enc->cert_verify_mac(s, 680 NID_md5, 681 &(s->s3-> 682 tmp.cert_verify_md 683 [0])); 684 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1, 685 &(s->s3-> 686 tmp.cert_verify_md 687 [MD5_DIGEST_LENGTH])); 688 } 689 break; 690 691 case SSL3_ST_SR_CERT_VRFY_A: 692 case SSL3_ST_SR_CERT_VRFY_B: 693 ret = ssl3_get_cert_verify(s); 694 if (ret <= 0) 695 goto end; 696#ifndef OPENSSL_NO_SCTP 697 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 698 state == SSL_ST_RENEGOTIATE) 699 s->state = DTLS1_SCTP_ST_SR_READ_SOCK; 700 else 701#endif 702 s->state = SSL3_ST_SR_FINISHED_A; 703 s->init_num = 0; 704 break; 705 706 case SSL3_ST_SR_FINISHED_A: 707 case SSL3_ST_SR_FINISHED_B: 708 /* 709 * Enable CCS. Receiving a CCS clears the flag, so make 710 * sure not to re-enable it to ban duplicates. This *should* be the 711 * first time we have received one - but we check anyway to be 712 * cautious. 713 * s->s3->change_cipher_spec is set when a CCS is 714 * processed in d1_pkt.c, and remains set until 715 * the client's Finished message is read. 716 */ 717 if (!s->s3->change_cipher_spec) 718 s->d1->change_cipher_spec_ok = 1; 719 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 720 SSL3_ST_SR_FINISHED_B); 721 if (ret <= 0) 722 goto end; 723 dtls1_stop_timer(s); 724 if (s->hit) 725 s->state = SSL_ST_OK; 726#ifndef OPENSSL_NO_TLSEXT 727 else if (s->tlsext_ticket_expected) 728 s->state = SSL3_ST_SW_SESSION_TICKET_A; 729#endif 730 else 731 s->state = SSL3_ST_SW_CHANGE_A; 732 s->init_num = 0; 733 break; 734 735#ifndef OPENSSL_NO_TLSEXT 736 case SSL3_ST_SW_SESSION_TICKET_A: 737 case SSL3_ST_SW_SESSION_TICKET_B: 738 ret = dtls1_send_newsession_ticket(s); 739 if (ret <= 0) 740 goto end; 741 s->state = SSL3_ST_SW_CHANGE_A; 742 s->init_num = 0; 743 break; 744 745 case SSL3_ST_SW_CERT_STATUS_A: 746 case SSL3_ST_SW_CERT_STATUS_B: 747 ret = ssl3_send_cert_status(s); 748 if (ret <= 0) 749 goto end; 750 s->state = SSL3_ST_SW_KEY_EXCH_A; 751 s->init_num = 0; 752 break; 753 754#endif 755 756 case SSL3_ST_SW_CHANGE_A: 757 case SSL3_ST_SW_CHANGE_B: 758 759 s->session->cipher = s->s3->tmp.new_cipher; 760 if (!s->method->ssl3_enc->setup_key_block(s)) { 761 ret = -1; 762 s->state = SSL_ST_ERR; 763 goto end; 764 } 765 766 ret = dtls1_send_change_cipher_spec(s, 767 SSL3_ST_SW_CHANGE_A, 768 SSL3_ST_SW_CHANGE_B); 769 770 if (ret <= 0) 771 goto end; 772 773#ifndef OPENSSL_NO_SCTP 774 if (!s->hit) { 775 /* 776 * Change to new shared key of SCTP-Auth, will be ignored if 777 * no SCTP used. 778 */ 779 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 780 0, NULL); 781 } 782#endif 783 784 s->state = SSL3_ST_SW_FINISHED_A; 785 s->init_num = 0; 786 787 if (!s->method->ssl3_enc->change_cipher_state(s, 788 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 789 { 790 ret = -1; 791 s->state = SSL_ST_ERR; 792 goto end; 793 } 794 795 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 796 break; 797 798 case SSL3_ST_SW_FINISHED_A: 799 case SSL3_ST_SW_FINISHED_B: 800 ret = dtls1_send_finished(s, 801 SSL3_ST_SW_FINISHED_A, 802 SSL3_ST_SW_FINISHED_B, 803 s->method-> 804 ssl3_enc->server_finished_label, 805 s->method-> 806 ssl3_enc->server_finished_label_len); 807 if (ret <= 0) 808 goto end; 809 s->state = SSL3_ST_SW_FLUSH; 810 if (s->hit) { 811 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A; 812 813#ifndef OPENSSL_NO_SCTP 814 /* 815 * Change to new shared key of SCTP-Auth, will be ignored if 816 * no SCTP used. 817 */ 818 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 819 0, NULL); 820#endif 821 } else { 822 s->s3->tmp.next_state = SSL_ST_OK; 823#ifndef OPENSSL_NO_SCTP 824 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 825 s->d1->next_state = s->s3->tmp.next_state; 826 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 827 } 828#endif 829 } 830 s->init_num = 0; 831 break; 832 833 case SSL_ST_OK: 834 /* clean a few things up */ 835 ssl3_cleanup_key_block(s); 836 837#if 0 838 BUF_MEM_free(s->init_buf); 839 s->init_buf = NULL; 840#endif 841 842 /* remove buffering on output */ 843 ssl_free_wbio_buffer(s); 844 845 s->init_num = 0; 846 847 if (s->renegotiate == 2) { /* skipped if we just sent a 848 * HelloRequest */ 849 s->renegotiate = 0; 850 s->new_session = 0; 851 852 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 853 854 s->ctx->stats.sess_accept_good++; 855 /* s->server=1; */ 856 s->handshake_func = dtls1_accept; 857 858 if (cb != NULL) 859 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 860 } 861 862 ret = 1; 863 864 /* done handshaking, next message is client hello */ 865 s->d1->handshake_read_seq = 0; 866 /* next message is server hello */ 867 s->d1->handshake_write_seq = 0; 868 s->d1->next_handshake_write_seq = 0; 869 goto end; 870 /* break; */ 871 872 case SSL_ST_ERR: 873 default: 874 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE); 875 ret = -1; 876 goto end; 877 /* break; */ 878 } 879 880 if (!s->s3->tmp.reuse_message && !skip) { 881 if (s->debug) { 882 if ((ret = BIO_flush(s->wbio)) <= 0) 883 goto end; 884 } 885 886 if ((cb != NULL) && (s->state != state)) { 887 new_state = s->state; 888 s->state = state; 889 cb(s, SSL_CB_ACCEPT_LOOP, 1); 890 s->state = new_state; 891 } 892 } 893 skip = 0; 894 } 895 end: 896 /* BIO_flush(s->wbio); */ 897 898 s->in_handshake--; 899#ifndef OPENSSL_NO_SCTP 900 /* 901 * Notify SCTP BIO socket to leave handshake mode and prevent stream 902 * identifier other than 0. Will be ignored if no SCTP is used. 903 */ 904 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 905 s->in_handshake, NULL); 906#endif 907 908 if (cb != NULL) 909 cb(s, SSL_CB_ACCEPT_EXIT, ret); 910 return (ret); 911} 912 913int dtls1_send_hello_request(SSL *s) 914{ 915 unsigned char *p; 916 917 if (s->state == SSL3_ST_SW_HELLO_REQ_A) { 918 p = (unsigned char *)s->init_buf->data; 919 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 920 921 s->state = SSL3_ST_SW_HELLO_REQ_B; 922 /* number of bytes to write */ 923 s->init_num = DTLS1_HM_HEADER_LENGTH; 924 s->init_off = 0; 925 926 /* 927 * no need to buffer this message, since there are no retransmit 928 * requests for it 929 */ 930 } 931 932 /* SSL3_ST_SW_HELLO_REQ_B */ 933 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 934} 935 936int dtls1_send_hello_verify_request(SSL *s) 937{ 938 unsigned int msg_len; 939 unsigned char *msg, *buf, *p; 940 941 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 942 buf = (unsigned char *)s->init_buf->data; 943 944 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 945 *(p++) = s->version >> 8; 946 *(p++) = s->version & 0xFF; 947 948 if (s->ctx->app_gen_cookie_cb == NULL || 949 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 950 &(s->d1->cookie_len)) == 0) { 951 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST, 952 ERR_R_INTERNAL_ERROR); 953 s->state = SSL_ST_ERR; 954 return 0; 955 } 956 957 *(p++) = (unsigned char)s->d1->cookie_len; 958 memcpy(p, s->d1->cookie, s->d1->cookie_len); 959 p += s->d1->cookie_len; 960 msg_len = p - msg; 961 962 dtls1_set_message_header(s, buf, 963 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, 964 msg_len); 965 966 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 967 /* number of bytes to write */ 968 s->init_num = p - buf; 969 s->init_off = 0; 970 } 971 972 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 973 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 974} 975 976int dtls1_send_server_hello(SSL *s) 977{ 978 unsigned char *buf; 979 unsigned char *p, *d; 980 int i; 981 unsigned int sl; 982 unsigned long l; 983 984 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) { 985 buf = (unsigned char *)s->init_buf->data; 986 p = s->s3->server_random; 987 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE); 988 /* Do the message type and length last */ 989 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 990 991 *(p++) = s->version >> 8; 992 *(p++) = s->version & 0xff; 993 994 /* Random stuff */ 995 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); 996 p += SSL3_RANDOM_SIZE; 997 998 /* 999 * now in theory we have 3 options to sending back the session id. 1000 * If it is a re-use, we send back the old session-id, if it is a new 1001 * session, we send back the new session-id or we send back a 0 1002 * length session-id if we want it to be single use. Currently I will 1003 * not implement the '0' length session-id 12-Jan-98 - I'll now 1004 * support the '0' length stuff. 1005 */ 1006 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 1007 s->session->session_id_length = 0; 1008 1009 sl = s->session->session_id_length; 1010 if (sl > sizeof s->session->session_id) { 1011 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 1012 return -1; 1013 } 1014 *(p++) = sl; 1015 memcpy(p, s->session->session_id, sl); 1016 p += sl; 1017 1018 /* put the cipher */ 1019 if (s->s3->tmp.new_cipher == NULL) 1020 return -1; 1021 i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p); 1022 p += i; 1023 1024 /* put the compression method */ 1025#ifdef OPENSSL_NO_COMP 1026 *(p++) = 0; 1027#else 1028 if (s->s3->tmp.new_compression == NULL) 1029 *(p++) = 0; 1030 else 1031 *(p++) = s->s3->tmp.new_compression->id; 1032#endif 1033 1034#ifndef OPENSSL_NO_TLSEXT 1035 if (ssl_prepare_serverhello_tlsext(s) <= 0) { 1036 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT); 1037 return -1; 1038 } 1039 if ((p = 1040 ssl_add_serverhello_tlsext(s, p, 1041 buf + SSL3_RT_MAX_PLAIN_LENGTH)) == 1042 NULL) { 1043 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 1044 return -1; 1045 } 1046#endif 1047 1048 /* do the header */ 1049 l = (p - d); 1050 d = buf; 1051 1052 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 1053 1054 s->state = SSL3_ST_SW_SRVR_HELLO_B; 1055 /* number of bytes to write */ 1056 s->init_num = p - buf; 1057 s->init_off = 0; 1058 1059 /* buffer the message to handle re-xmits */ 1060 dtls1_buffer_message(s, 0); 1061 } 1062 1063 /* SSL3_ST_SW_SRVR_HELLO_B */ 1064 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1065} 1066 1067int dtls1_send_server_done(SSL *s) 1068{ 1069 unsigned char *p; 1070 1071 if (s->state == SSL3_ST_SW_SRVR_DONE_A) { 1072 p = (unsigned char *)s->init_buf->data; 1073 1074 /* do the header */ 1075 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 1076 1077 s->state = SSL3_ST_SW_SRVR_DONE_B; 1078 /* number of bytes to write */ 1079 s->init_num = DTLS1_HM_HEADER_LENGTH; 1080 s->init_off = 0; 1081 1082 /* buffer the message to handle re-xmits */ 1083 dtls1_buffer_message(s, 0); 1084 } 1085 1086 /* SSL3_ST_SW_SRVR_DONE_B */ 1087 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1088} 1089 1090int dtls1_send_server_key_exchange(SSL *s) 1091{ 1092#ifndef OPENSSL_NO_RSA 1093 unsigned char *q; 1094 int j, num; 1095 RSA *rsa; 1096 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 1097 unsigned int u; 1098#endif 1099#ifndef OPENSSL_NO_DH 1100 DH *dh = NULL, *dhp; 1101#endif 1102#ifndef OPENSSL_NO_ECDH 1103 EC_KEY *ecdh = NULL, *ecdhp; 1104 unsigned char *encodedPoint = NULL; 1105 int encodedlen = 0; 1106 int curve_id = 0; 1107 BN_CTX *bn_ctx = NULL; 1108#endif 1109 EVP_PKEY *pkey; 1110 unsigned char *p, *d; 1111 int al, i; 1112 unsigned long type; 1113 int n; 1114 CERT *cert; 1115 BIGNUM *r[4]; 1116 int nr[4], kn; 1117 BUF_MEM *buf; 1118 EVP_MD_CTX md_ctx; 1119 1120 EVP_MD_CTX_init(&md_ctx); 1121 if (s->state == SSL3_ST_SW_KEY_EXCH_A) { 1122 type = s->s3->tmp.new_cipher->algorithm_mkey; 1123 cert = s->cert; 1124 1125 buf = s->init_buf; 1126 1127 r[0] = r[1] = r[2] = r[3] = NULL; 1128 n = 0; 1129#ifndef OPENSSL_NO_RSA 1130 if (type & SSL_kRSA) { 1131 rsa = cert->rsa_tmp; 1132 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) { 1133 rsa = s->cert->rsa_tmp_cb(s, 1134 SSL_C_IS_EXPORT(s->s3-> 1135 tmp.new_cipher), 1136 SSL_C_EXPORT_PKEYLENGTH(s->s3-> 1137 tmp.new_cipher)); 1138 if (rsa == NULL) { 1139 al = SSL_AD_HANDSHAKE_FAILURE; 1140 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1141 SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 1142 goto f_err; 1143 } 1144 RSA_up_ref(rsa); 1145 cert->rsa_tmp = rsa; 1146 } 1147 if (rsa == NULL) { 1148 al = SSL_AD_HANDSHAKE_FAILURE; 1149 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1150 SSL_R_MISSING_TMP_RSA_KEY); 1151 goto f_err; 1152 } 1153 r[0] = rsa->n; 1154 r[1] = rsa->e; 1155 s->s3->tmp.use_rsa_tmp = 1; 1156 } else 1157#endif 1158#ifndef OPENSSL_NO_DH 1159 if (type & SSL_kEDH) { 1160 dhp = cert->dh_tmp; 1161 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 1162 dhp = s->cert->dh_tmp_cb(s, 1163 SSL_C_IS_EXPORT(s->s3-> 1164 tmp.new_cipher), 1165 SSL_C_EXPORT_PKEYLENGTH(s->s3-> 1166 tmp.new_cipher)); 1167 if (dhp == NULL) { 1168 al = SSL_AD_HANDSHAKE_FAILURE; 1169 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1170 SSL_R_MISSING_TMP_DH_KEY); 1171 goto f_err; 1172 } 1173 1174 if (s->s3->tmp.dh != NULL) { 1175 DH_free(dh); 1176 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1177 ERR_R_INTERNAL_ERROR); 1178 goto err; 1179 } 1180 1181 if ((dh = DHparams_dup(dhp)) == NULL) { 1182 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); 1183 goto err; 1184 } 1185 1186 s->s3->tmp.dh = dh; 1187 if ((dhp->pub_key == NULL || 1188 dhp->priv_key == NULL || 1189 (s->options & SSL_OP_SINGLE_DH_USE))) { 1190 if (!DH_generate_key(dh)) { 1191 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1192 ERR_R_DH_LIB); 1193 goto err; 1194 } 1195 } else { 1196 dh->pub_key = BN_dup(dhp->pub_key); 1197 dh->priv_key = BN_dup(dhp->priv_key); 1198 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) { 1199 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1200 ERR_R_DH_LIB); 1201 goto err; 1202 } 1203 } 1204 r[0] = dh->p; 1205 r[1] = dh->g; 1206 r[2] = dh->pub_key; 1207 } else 1208#endif 1209#ifndef OPENSSL_NO_ECDH 1210 if (type & SSL_kEECDH) { 1211 const EC_GROUP *group; 1212 1213 ecdhp = cert->ecdh_tmp; 1214 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) { 1215 ecdhp = s->cert->ecdh_tmp_cb(s, 1216 SSL_C_IS_EXPORT(s->s3-> 1217 tmp.new_cipher), 1218 SSL_C_EXPORT_PKEYLENGTH(s-> 1219 s3->tmp.new_cipher)); 1220 } 1221 if (ecdhp == NULL) { 1222 al = SSL_AD_HANDSHAKE_FAILURE; 1223 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1224 SSL_R_MISSING_TMP_ECDH_KEY); 1225 goto f_err; 1226 } 1227 1228 if (s->s3->tmp.ecdh != NULL) { 1229 EC_KEY_free(s->s3->tmp.ecdh); 1230 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1231 ERR_R_INTERNAL_ERROR); 1232 goto err; 1233 } 1234 1235 /* Duplicate the ECDH structure. */ 1236 if (ecdhp == NULL) { 1237 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1238 goto err; 1239 } 1240 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) { 1241 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1242 goto err; 1243 } 1244 1245 s->s3->tmp.ecdh = ecdh; 1246 if ((EC_KEY_get0_public_key(ecdh) == NULL) || 1247 (EC_KEY_get0_private_key(ecdh) == NULL) || 1248 (s->options & SSL_OP_SINGLE_ECDH_USE)) { 1249 if (!EC_KEY_generate_key(ecdh)) { 1250 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1251 ERR_R_ECDH_LIB); 1252 goto err; 1253 } 1254 } 1255 1256 if (((group = EC_KEY_get0_group(ecdh)) == NULL) || 1257 (EC_KEY_get0_public_key(ecdh) == NULL) || 1258 (EC_KEY_get0_private_key(ecdh) == NULL)) { 1259 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1260 goto err; 1261 } 1262 1263 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1264 (EC_GROUP_get_degree(group) > 163)) { 1265 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1266 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1267 goto err; 1268 } 1269 1270 /* 1271 * XXX: For now, we only support ephemeral ECDH keys over named 1272 * (not generic) curves. For supported named curves, curve_id is 1273 * non-zero. 1274 */ 1275 if ((curve_id = 1276 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) 1277 == 0) { 1278 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1279 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1280 goto err; 1281 } 1282 1283 /* 1284 * Encode the public key. First check the size of encoding and 1285 * allocate memory accordingly. 1286 */ 1287 encodedlen = EC_POINT_point2oct(group, 1288 EC_KEY_get0_public_key(ecdh), 1289 POINT_CONVERSION_UNCOMPRESSED, 1290 NULL, 0, NULL); 1291 1292 encodedPoint = (unsigned char *) 1293 OPENSSL_malloc(encodedlen * sizeof(unsigned char)); 1294 bn_ctx = BN_CTX_new(); 1295 if ((encodedPoint == NULL) || (bn_ctx == NULL)) { 1296 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1297 ERR_R_MALLOC_FAILURE); 1298 goto err; 1299 } 1300 1301 encodedlen = EC_POINT_point2oct(group, 1302 EC_KEY_get0_public_key(ecdh), 1303 POINT_CONVERSION_UNCOMPRESSED, 1304 encodedPoint, encodedlen, bn_ctx); 1305 1306 if (encodedlen == 0) { 1307 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1308 goto err; 1309 } 1310 1311 BN_CTX_free(bn_ctx); 1312 bn_ctx = NULL; 1313 1314 /* 1315 * XXX: For now, we only support named (not generic) curves in 1316 * ECDH ephemeral key exchanges. In this situation, we need four 1317 * additional bytes to encode the entire ServerECDHParams 1318 * structure. 1319 */ 1320 n = 4 + encodedlen; 1321 1322 /* 1323 * We'll generate the serverKeyExchange message explicitly so we 1324 * can set these to NULLs 1325 */ 1326 r[0] = NULL; 1327 r[1] = NULL; 1328 r[2] = NULL; 1329 r[3] = NULL; 1330 } else 1331#endif /* !OPENSSL_NO_ECDH */ 1332#ifndef OPENSSL_NO_PSK 1333 if (type & SSL_kPSK) { 1334 /* 1335 * reserve size for record length and PSK identity hint 1336 */ 1337 n += 2 + strlen(s->ctx->psk_identity_hint); 1338 } else 1339#endif /* !OPENSSL_NO_PSK */ 1340 { 1341 al = SSL_AD_HANDSHAKE_FAILURE; 1342 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1343 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1344 goto f_err; 1345 } 1346 for (i = 0; r[i] != NULL; i++) { 1347 nr[i] = BN_num_bytes(r[i]); 1348 n += 2 + nr[i]; 1349 } 1350 1351 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 1352 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 1353 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, NULL)) 1354 == NULL) { 1355 al = SSL_AD_DECODE_ERROR; 1356 goto f_err; 1357 } 1358 kn = EVP_PKEY_size(pkey); 1359 } else { 1360 pkey = NULL; 1361 kn = 0; 1362 } 1363 1364 if (!BUF_MEM_grow_clean(buf, n + DTLS1_HM_HEADER_LENGTH + kn)) { 1365 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF); 1366 goto err; 1367 } 1368 d = (unsigned char *)s->init_buf->data; 1369 p = &(d[DTLS1_HM_HEADER_LENGTH]); 1370 1371 for (i = 0; r[i] != NULL; i++) { 1372 s2n(nr[i], p); 1373 BN_bn2bin(r[i], p); 1374 p += nr[i]; 1375 } 1376 1377#ifndef OPENSSL_NO_ECDH 1378 if (type & SSL_kEECDH) { 1379 /* 1380 * XXX: For now, we only support named (not generic) curves. In 1381 * this situation, the serverKeyExchange message has: [1 byte 1382 * CurveType], [2 byte CurveName] [1 byte length of encoded 1383 * point], followed by the actual encoded point itself 1384 */ 1385 *p = NAMED_CURVE_TYPE; 1386 p += 1; 1387 *p = 0; 1388 p += 1; 1389 *p = curve_id; 1390 p += 1; 1391 *p = encodedlen; 1392 p += 1; 1393 memcpy((unsigned char *)p, 1394 (unsigned char *)encodedPoint, encodedlen); 1395 OPENSSL_free(encodedPoint); 1396 encodedPoint = NULL; 1397 p += encodedlen; 1398 } 1399#endif 1400 1401#ifndef OPENSSL_NO_PSK 1402 if (type & SSL_kPSK) { 1403 /* copy PSK identity hint */ 1404 s2n(strlen(s->ctx->psk_identity_hint), p); 1405 strncpy((char *)p, s->ctx->psk_identity_hint, 1406 strlen(s->ctx->psk_identity_hint)); 1407 p += strlen(s->ctx->psk_identity_hint); 1408 } 1409#endif 1410 1411 /* not anonymous */ 1412 if (pkey != NULL) { 1413 /* 1414 * n is the length of the params, they start at 1415 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space at the 1416 * end. 1417 */ 1418#ifndef OPENSSL_NO_RSA 1419 if (pkey->type == EVP_PKEY_RSA) { 1420 q = md_buf; 1421 j = 0; 1422 for (num = 2; num > 0; num--) { 1423 EVP_DigestInit_ex(&md_ctx, (num == 2) 1424 ? s->ctx->md5 : s->ctx->sha1, NULL); 1425 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]), 1426 SSL3_RANDOM_SIZE); 1427 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]), 1428 SSL3_RANDOM_SIZE); 1429 EVP_DigestUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), 1430 n); 1431 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i); 1432 q += i; 1433 j += i; 1434 } 1435 if (RSA_sign(NID_md5_sha1, md_buf, j, 1436 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 1437 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA); 1438 goto err; 1439 } 1440 s2n(u, p); 1441 n += u + 2; 1442 } else 1443#endif 1444#if !defined(OPENSSL_NO_DSA) 1445 if (pkey->type == EVP_PKEY_DSA) { 1446 /* lets do DSS */ 1447 EVP_SignInit_ex(&md_ctx, EVP_dss1(), NULL); 1448 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]), 1449 SSL3_RANDOM_SIZE); 1450 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]), 1451 SSL3_RANDOM_SIZE); 1452 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n); 1453 if (!EVP_SignFinal(&md_ctx, &(p[2]), 1454 (unsigned int *)&i, pkey)) { 1455 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_DSA); 1456 goto err; 1457 } 1458 s2n(i, p); 1459 n += i + 2; 1460 } else 1461#endif 1462#if !defined(OPENSSL_NO_ECDSA) 1463 if (pkey->type == EVP_PKEY_EC) { 1464 /* let's do ECDSA */ 1465 EVP_SignInit_ex(&md_ctx, EVP_ecdsa(), NULL); 1466 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]), 1467 SSL3_RANDOM_SIZE); 1468 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]), 1469 SSL3_RANDOM_SIZE); 1470 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n); 1471 if (!EVP_SignFinal(&md_ctx, &(p[2]), 1472 (unsigned int *)&i, pkey)) { 1473 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1474 ERR_LIB_ECDSA); 1475 goto err; 1476 } 1477 s2n(i, p); 1478 n += i + 2; 1479 } else 1480#endif 1481 { 1482 /* Is this error check actually needed? */ 1483 al = SSL_AD_HANDSHAKE_FAILURE; 1484 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1485 SSL_R_UNKNOWN_PKEY_TYPE); 1486 goto f_err; 1487 } 1488 } 1489 1490 d = dtls1_set_message_header(s, d, 1491 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1492 1493 /* 1494 * we should now have things packed up, so lets send it off 1495 */ 1496 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1497 s->init_off = 0; 1498 1499 /* buffer the message to handle re-xmits */ 1500 dtls1_buffer_message(s, 0); 1501 } 1502 1503 s->state = SSL3_ST_SW_KEY_EXCH_B; 1504 EVP_MD_CTX_cleanup(&md_ctx); 1505 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1506 f_err: 1507 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1508 err: 1509#ifndef OPENSSL_NO_ECDH 1510 if (encodedPoint != NULL) 1511 OPENSSL_free(encodedPoint); 1512 BN_CTX_free(bn_ctx); 1513#endif 1514 EVP_MD_CTX_cleanup(&md_ctx); 1515 return (-1); 1516} 1517 1518int dtls1_send_certificate_request(SSL *s) 1519{ 1520 unsigned char *p, *d; 1521 int i, j, nl, off, n; 1522 STACK_OF(X509_NAME) *sk = NULL; 1523 X509_NAME *name; 1524 BUF_MEM *buf; 1525 unsigned int msg_len; 1526 1527 if (s->state == SSL3_ST_SW_CERT_REQ_A) { 1528 buf = s->init_buf; 1529 1530 d = p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1531 1532 /* get the list of acceptable cert types */ 1533 p++; 1534 n = ssl3_get_req_cert_type(s, p); 1535 d[0] = n; 1536 p += n; 1537 n++; 1538 1539 off = n; 1540 p += 2; 1541 n += 2; 1542 1543 sk = SSL_get_client_CA_list(s); 1544 nl = 0; 1545 if (sk != NULL) { 1546 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1547 name = sk_X509_NAME_value(sk, i); 1548 j = i2d_X509_NAME(name, NULL); 1549 if (!BUF_MEM_grow_clean 1550 (buf, DTLS1_HM_HEADER_LENGTH + n + j + 2)) { 1551 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST, 1552 ERR_R_BUF_LIB); 1553 goto err; 1554 } 1555 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + n]); 1556 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) { 1557 s2n(j, p); 1558 i2d_X509_NAME(name, &p); 1559 n += 2 + j; 1560 nl += 2 + j; 1561 } else { 1562 d = p; 1563 i2d_X509_NAME(name, &p); 1564 j -= 2; 1565 s2n(j, d); 1566 j += 2; 1567 n += j; 1568 nl += j; 1569 } 1570 } 1571 } 1572 /* else no CA names */ 1573 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + off]); 1574 s2n(nl, p); 1575 1576 d = (unsigned char *)buf->data; 1577 *(d++) = SSL3_MT_CERTIFICATE_REQUEST; 1578 l2n3(n, d); 1579 s2n(s->d1->handshake_write_seq, d); 1580 s->d1->handshake_write_seq++; 1581 1582 /* 1583 * we should now have things packed up, so lets send it off 1584 */ 1585 1586 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1587 s->init_off = 0; 1588#ifdef NETSCAPE_HANG_BUG 1589/* XXX: what to do about this? */ 1590 p = (unsigned char *)s->init_buf->data + s->init_num; 1591 1592 /* do the header */ 1593 *(p++) = SSL3_MT_SERVER_DONE; 1594 *(p++) = 0; 1595 *(p++) = 0; 1596 *(p++) = 0; 1597 s->init_num += 4; 1598#endif 1599 1600 /* XDTLS: set message header ? */ 1601 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1602 dtls1_set_message_header(s, (void *)s->init_buf->data, 1603 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, 1604 msg_len); 1605 1606 /* buffer the message to handle re-xmits */ 1607 dtls1_buffer_message(s, 0); 1608 1609 s->state = SSL3_ST_SW_CERT_REQ_B; 1610 } 1611 1612 /* SSL3_ST_SW_CERT_REQ_B */ 1613 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1614 err: 1615 return (-1); 1616} 1617 1618int dtls1_send_server_certificate(SSL *s) 1619{ 1620 unsigned long l; 1621 X509 *x; 1622 1623 if (s->state == SSL3_ST_SW_CERT_A) { 1624 x = ssl_get_server_send_cert(s); 1625 if (x == NULL) { 1626 /* VRS: allow null cert if auth == KRB5 */ 1627 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || 1628 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) { 1629 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, 1630 ERR_R_INTERNAL_ERROR); 1631 return (0); 1632 } 1633 } 1634 1635 l = dtls1_output_cert_chain(s, x); 1636 if (!l) { 1637 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1638 return (0); 1639 } 1640 s->state = SSL3_ST_SW_CERT_B; 1641 s->init_num = (int)l; 1642 s->init_off = 0; 1643 1644 /* buffer the message to handle re-xmits */ 1645 dtls1_buffer_message(s, 0); 1646 } 1647 1648 /* SSL3_ST_SW_CERT_B */ 1649 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1650} 1651 1652#ifndef OPENSSL_NO_TLSEXT 1653int dtls1_send_newsession_ticket(SSL *s) 1654{ 1655 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) { 1656 unsigned char *p, *senc, *macstart; 1657 int len, slen; 1658 unsigned int hlen, msg_len; 1659 EVP_CIPHER_CTX ctx; 1660 HMAC_CTX hctx; 1661 SSL_CTX *tctx = s->initial_ctx; 1662 unsigned char iv[EVP_MAX_IV_LENGTH]; 1663 unsigned char key_name[16]; 1664 1665 /* get session encoding length */ 1666 slen = i2d_SSL_SESSION(s->session, NULL); 1667 /* 1668 * Some length values are 16 bits, so forget it if session is too 1669 * long 1670 */ 1671 if (slen > 0xFF00) 1672 return -1; 1673 /* 1674 * Grow buffer if need be: the length calculation is as follows 12 1675 * (DTLS handshake message header) + 4 (ticket lifetime hint) + 2 1676 * (ticket length) + 16 (key name) + max_iv_len (iv length) + 1677 * session_length + max_enc_block_size (max encrypted session length) 1678 * + max_md_size (HMAC). 1679 */ 1680 if (!BUF_MEM_grow(s->init_buf, 1681 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1682 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1683 return -1; 1684 senc = OPENSSL_malloc(slen); 1685 if (!senc) 1686 return -1; 1687 p = senc; 1688 i2d_SSL_SESSION(s->session, &p); 1689 1690 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1691 EVP_CIPHER_CTX_init(&ctx); 1692 HMAC_CTX_init(&hctx); 1693 /* 1694 * Initialize HMAC and cipher contexts. If callback present it does 1695 * all the work otherwise use generated values from parent ctx. 1696 */ 1697 if (tctx->tlsext_ticket_key_cb) { 1698 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1699 &hctx, 1) < 0) { 1700 OPENSSL_free(senc); 1701 return -1; 1702 } 1703 } else { 1704 RAND_pseudo_bytes(iv, 16); 1705 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1706 tctx->tlsext_tick_aes_key, iv); 1707 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1708 tlsext_tick_md(), NULL); 1709 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1710 } 1711 l2n(s->session->tlsext_tick_lifetime_hint, p); 1712 /* Skip ticket length for now */ 1713 p += 2; 1714 /* Output key name */ 1715 macstart = p; 1716 memcpy(p, key_name, 16); 1717 p += 16; 1718 /* output IV */ 1719 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1720 p += EVP_CIPHER_CTX_iv_length(&ctx); 1721 /* Encrypt session data */ 1722 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1723 p += len; 1724 EVP_EncryptFinal(&ctx, p, &len); 1725 p += len; 1726 EVP_CIPHER_CTX_cleanup(&ctx); 1727 1728 HMAC_Update(&hctx, macstart, p - macstart); 1729 HMAC_Final(&hctx, p, &hlen); 1730 HMAC_CTX_cleanup(&hctx); 1731 1732 p += hlen; 1733 /* Now write out lengths: p points to end of data written */ 1734 /* Total length */ 1735 len = p - (unsigned char *)(s->init_buf->data); 1736 /* Ticket length */ 1737 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1738 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1739 1740 /* number of bytes to write */ 1741 s->init_num = len; 1742 s->state = SSL3_ST_SW_SESSION_TICKET_B; 1743 s->init_off = 0; 1744 OPENSSL_free(senc); 1745 1746 /* XDTLS: set message header ? */ 1747 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1748 dtls1_set_message_header(s, (void *)s->init_buf->data, 1749 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, 1750 msg_len); 1751 1752 /* buffer the message to handle re-xmits */ 1753 dtls1_buffer_message(s, 0); 1754 } 1755 1756 /* SSL3_ST_SW_SESSION_TICKET_B */ 1757 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1758} 1759#endif 1760