d1_srvr.c revision 296341
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 { 271 /* 272 * s->state == SSL_ST_RENEGOTIATE, we will just send a 273 * HelloRequest 274 */ 275 s->ctx->stats.sess_accept_renegotiate++; 276 s->state = SSL3_ST_SW_HELLO_REQ_A; 277 } 278 279 break; 280 281 case SSL3_ST_SW_HELLO_REQ_A: 282 case SSL3_ST_SW_HELLO_REQ_B: 283 284 s->shutdown = 0; 285 dtls1_clear_record_buffer(s); 286 dtls1_start_timer(s); 287 ret = dtls1_send_hello_request(s); 288 if (ret <= 0) 289 goto end; 290 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 291 s->state = SSL3_ST_SW_FLUSH; 292 s->init_num = 0; 293 294 ssl3_init_finished_mac(s); 295 break; 296 297 case SSL3_ST_SW_HELLO_REQ_C: 298 s->state = SSL_ST_OK; 299 break; 300 301 case SSL3_ST_SR_CLNT_HELLO_A: 302 case SSL3_ST_SR_CLNT_HELLO_B: 303 case SSL3_ST_SR_CLNT_HELLO_C: 304 305 s->shutdown = 0; 306 ret = ssl3_get_client_hello(s); 307 if (ret <= 0) 308 goto end; 309 dtls1_stop_timer(s); 310 311 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 312 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 313 else 314 s->state = SSL3_ST_SW_SRVR_HELLO_A; 315 316 s->init_num = 0; 317 318 /* 319 * Reflect ClientHello sequence to remain stateless while 320 * listening 321 */ 322 if (listen) { 323 memcpy(s->s3->write_sequence, s->s3->read_sequence, 324 sizeof(s->s3->write_sequence)); 325 } 326 327 /* If we're just listening, stop here */ 328 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) { 329 ret = 2; 330 s->d1->listen = 0; 331 /* 332 * Set expected sequence numbers to continue the handshake. 333 */ 334 s->d1->handshake_read_seq = 2; 335 s->d1->handshake_write_seq = 1; 336 s->d1->next_handshake_write_seq = 1; 337 goto end; 338 } 339 340 break; 341 342 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 343 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 344 345 ret = dtls1_send_hello_verify_request(s); 346 if (ret <= 0) 347 goto end; 348 s->state = SSL3_ST_SW_FLUSH; 349 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A; 350 351 /* HelloVerifyRequest resets Finished MAC */ 352 if (s->version != DTLS1_BAD_VER) 353 ssl3_init_finished_mac(s); 354 break; 355 356#ifndef OPENSSL_NO_SCTP 357 case DTLS1_SCTP_ST_SR_READ_SOCK: 358 359 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) { 360 s->s3->in_read_app_data = 2; 361 s->rwstate = SSL_READING; 362 BIO_clear_retry_flags(SSL_get_rbio(s)); 363 BIO_set_retry_read(SSL_get_rbio(s)); 364 ret = -1; 365 goto end; 366 } 367 368 s->state = SSL3_ST_SR_FINISHED_A; 369 break; 370 371 case DTLS1_SCTP_ST_SW_WRITE_SOCK: 372 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 373 if (ret < 0) 374 goto end; 375 376 if (ret == 0) { 377 if (s->d1->next_state != SSL_ST_OK) { 378 s->s3->in_read_app_data = 2; 379 s->rwstate = SSL_READING; 380 BIO_clear_retry_flags(SSL_get_rbio(s)); 381 BIO_set_retry_read(SSL_get_rbio(s)); 382 ret = -1; 383 goto end; 384 } 385 } 386 387 s->state = s->d1->next_state; 388 break; 389#endif 390 391 case SSL3_ST_SW_SRVR_HELLO_A: 392 case SSL3_ST_SW_SRVR_HELLO_B: 393 s->renegotiate = 2; 394 dtls1_start_timer(s); 395 ret = dtls1_send_server_hello(s); 396 if (ret <= 0) 397 goto end; 398 399 if (s->hit) { 400#ifndef OPENSSL_NO_SCTP 401 /* 402 * Add new shared key for SCTP-Auth, will be ignored if no 403 * SCTP used. 404 */ 405 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 406 DTLS1_SCTP_AUTH_LABEL); 407 408 SSL_export_keying_material(s, sctpauthkey, 409 sizeof(sctpauthkey), labelbuffer, 410 sizeof(labelbuffer), NULL, 0, 0); 411 412 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 413 sizeof(sctpauthkey), sctpauthkey); 414#endif 415#ifndef OPENSSL_NO_TLSEXT 416 if (s->tlsext_ticket_expected) 417 s->state = SSL3_ST_SW_SESSION_TICKET_A; 418 else 419 s->state = SSL3_ST_SW_CHANGE_A; 420#else 421 s->state = SSL3_ST_SW_CHANGE_A; 422#endif 423 } else 424 s->state = SSL3_ST_SW_CERT_A; 425 s->init_num = 0; 426 break; 427 428 case SSL3_ST_SW_CERT_A: 429 case SSL3_ST_SW_CERT_B: 430 /* Check if it is anon DH or normal PSK */ 431 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 432 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 433 dtls1_start_timer(s); 434 ret = dtls1_send_server_certificate(s); 435 if (ret <= 0) 436 goto end; 437#ifndef OPENSSL_NO_TLSEXT 438 if (s->tlsext_status_expected) 439 s->state = SSL3_ST_SW_CERT_STATUS_A; 440 else 441 s->state = SSL3_ST_SW_KEY_EXCH_A; 442 } else { 443 skip = 1; 444 s->state = SSL3_ST_SW_KEY_EXCH_A; 445 } 446#else 447 } else 448 skip = 1; 449 450 s->state = SSL3_ST_SW_KEY_EXCH_A; 451#endif 452 s->init_num = 0; 453 break; 454 455 case SSL3_ST_SW_KEY_EXCH_A: 456 case SSL3_ST_SW_KEY_EXCH_B: 457 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 458 459 /* 460 * clear this, it may get reset by 461 * send_server_key_exchange 462 */ 463 s->s3->tmp.use_rsa_tmp = 0; 464 465 /* 466 * only send if a DH key exchange or RSA but we have a sign only 467 * certificate 468 */ 469 if (0 470 /* 471 * PSK: send ServerKeyExchange if PSK identity hint if 472 * provided 473 */ 474#ifndef OPENSSL_NO_PSK 475 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) 476#endif 477 || (alg_k & SSL_kEDH) 478 || (alg_k & SSL_kEECDH) 479 || ((alg_k & SSL_kRSA) 480 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 481 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 482 && EVP_PKEY_size(s->cert->pkeys 483 [SSL_PKEY_RSA_ENC].privatekey) * 484 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 485 ) 486 ) 487 ) 488 ) { 489 dtls1_start_timer(s); 490 ret = dtls1_send_server_key_exchange(s); 491 if (ret <= 0) 492 goto end; 493 } else 494 skip = 1; 495 496 s->state = SSL3_ST_SW_CERT_REQ_A; 497 s->init_num = 0; 498 break; 499 500 case SSL3_ST_SW_CERT_REQ_A: 501 case SSL3_ST_SW_CERT_REQ_B: 502 if ( /* don't request cert unless asked for it: */ 503 !(s->verify_mode & SSL_VERIFY_PEER) || 504 /* 505 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert 506 * during re-negotiation: 507 */ 508 ((s->session->peer != NULL) && 509 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 510 /* 511 * never request cert in anonymous ciphersuites (see 512 * section "Certificate request" in SSL 3 drafts and in 513 * RFC 2246): 514 */ 515 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 516 /* 517 * ... except when the application insists on 518 * verification (against the specs, but s3_clnt.c accepts 519 * this for SSL 3) 520 */ 521 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 522 /* 523 * never request cert in Kerberos ciphersuites 524 */ 525 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 526 /* 527 * With normal PSK Certificates and Certificate Requests 528 * are omitted 529 */ 530 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 531 /* no cert request */ 532 skip = 1; 533 s->s3->tmp.cert_request = 0; 534 s->state = SSL3_ST_SW_SRVR_DONE_A; 535#ifndef OPENSSL_NO_SCTP 536 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 537 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 538 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 539 } 540#endif 541 } else { 542 s->s3->tmp.cert_request = 1; 543 dtls1_start_timer(s); 544 ret = dtls1_send_certificate_request(s); 545 if (ret <= 0) 546 goto end; 547#ifndef NETSCAPE_HANG_BUG 548 s->state = SSL3_ST_SW_SRVR_DONE_A; 549# ifndef OPENSSL_NO_SCTP 550 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 551 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 552 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 553 } 554# endif 555#else 556 s->state = SSL3_ST_SW_FLUSH; 557 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 558# ifndef OPENSSL_NO_SCTP 559 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 560 s->d1->next_state = s->s3->tmp.next_state; 561 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 562 } 563# endif 564#endif 565 s->init_num = 0; 566 } 567 break; 568 569 case SSL3_ST_SW_SRVR_DONE_A: 570 case SSL3_ST_SW_SRVR_DONE_B: 571 dtls1_start_timer(s); 572 ret = dtls1_send_server_done(s); 573 if (ret <= 0) 574 goto end; 575 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A; 576 s->state = SSL3_ST_SW_FLUSH; 577 s->init_num = 0; 578 break; 579 580 case SSL3_ST_SW_FLUSH: 581 s->rwstate = SSL_WRITING; 582 if (BIO_flush(s->wbio) <= 0) { 583 /* 584 * If the write error was fatal, stop trying 585 */ 586 if (!BIO_should_retry(s->wbio)) { 587 s->rwstate = SSL_NOTHING; 588 s->state = s->s3->tmp.next_state; 589 } 590 591 ret = -1; 592 goto end; 593 } 594 s->rwstate = SSL_NOTHING; 595 s->state = s->s3->tmp.next_state; 596 break; 597 598 case SSL3_ST_SR_CERT_A: 599 case SSL3_ST_SR_CERT_B: 600 /* Check for second client hello (MS SGC) */ 601 ret = ssl3_check_client_hello(s); 602 if (ret <= 0) 603 goto end; 604 if (ret == 2) { 605 dtls1_stop_timer(s); 606 s->state = SSL3_ST_SR_CLNT_HELLO_C; 607 } else { 608 if (s->s3->tmp.cert_request) { 609 ret = ssl3_get_client_certificate(s); 610 if (ret <= 0) 611 goto end; 612 } 613 s->init_num = 0; 614 s->state = SSL3_ST_SR_KEY_EXCH_A; 615 } 616 break; 617 618 case SSL3_ST_SR_KEY_EXCH_A: 619 case SSL3_ST_SR_KEY_EXCH_B: 620 ret = ssl3_get_client_key_exchange(s); 621 if (ret <= 0) 622 goto end; 623#ifndef OPENSSL_NO_SCTP 624 /* 625 * Add new shared key for SCTP-Auth, will be ignored if no SCTP 626 * used. 627 */ 628 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 629 DTLS1_SCTP_AUTH_LABEL); 630 631 SSL_export_keying_material(s, sctpauthkey, 632 sizeof(sctpauthkey), labelbuffer, 633 sizeof(labelbuffer), NULL, 0, 0); 634 635 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 636 sizeof(sctpauthkey), sctpauthkey); 637#endif 638 639 s->state = SSL3_ST_SR_CERT_VRFY_A; 640 s->init_num = 0; 641 642 if (ret == 2) { 643 /* 644 * For the ECDH ciphersuites when the client sends its ECDH 645 * pub key in a certificate, the CertificateVerify message is 646 * not sent. 647 */ 648 s->state = SSL3_ST_SR_FINISHED_A; 649 s->init_num = 0; 650 } else { 651 s->state = SSL3_ST_SR_CERT_VRFY_A; 652 s->init_num = 0; 653 654 /* 655 * We need to get hashes here so if there is a client cert, 656 * it can be verified 657 */ 658 s->method->ssl3_enc->cert_verify_mac(s, 659 NID_md5, 660 &(s->s3-> 661 tmp.cert_verify_md 662 [0])); 663 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1, 664 &(s->s3-> 665 tmp.cert_verify_md 666 [MD5_DIGEST_LENGTH])); 667 } 668 break; 669 670 case SSL3_ST_SR_CERT_VRFY_A: 671 case SSL3_ST_SR_CERT_VRFY_B: 672 ret = ssl3_get_cert_verify(s); 673 if (ret <= 0) 674 goto end; 675#ifndef OPENSSL_NO_SCTP 676 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 677 state == SSL_ST_RENEGOTIATE) 678 s->state = DTLS1_SCTP_ST_SR_READ_SOCK; 679 else 680#endif 681 s->state = SSL3_ST_SR_FINISHED_A; 682 s->init_num = 0; 683 break; 684 685 case SSL3_ST_SR_FINISHED_A: 686 case SSL3_ST_SR_FINISHED_B: 687 /* 688 * Enable CCS. Receiving a CCS clears the flag, so make 689 * sure not to re-enable it to ban duplicates. This *should* be the 690 * first time we have received one - but we check anyway to be 691 * cautious. 692 * s->s3->change_cipher_spec is set when a CCS is 693 * processed in d1_pkt.c, and remains set until 694 * the client's Finished message is read. 695 */ 696 if (!s->s3->change_cipher_spec) 697 s->d1->change_cipher_spec_ok = 1; 698 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, 699 SSL3_ST_SR_FINISHED_B); 700 if (ret <= 0) 701 goto end; 702 dtls1_stop_timer(s); 703 if (s->hit) 704 s->state = SSL_ST_OK; 705#ifndef OPENSSL_NO_TLSEXT 706 else if (s->tlsext_ticket_expected) 707 s->state = SSL3_ST_SW_SESSION_TICKET_A; 708#endif 709 else 710 s->state = SSL3_ST_SW_CHANGE_A; 711 s->init_num = 0; 712 break; 713 714#ifndef OPENSSL_NO_TLSEXT 715 case SSL3_ST_SW_SESSION_TICKET_A: 716 case SSL3_ST_SW_SESSION_TICKET_B: 717 ret = dtls1_send_newsession_ticket(s); 718 if (ret <= 0) 719 goto end; 720 s->state = SSL3_ST_SW_CHANGE_A; 721 s->init_num = 0; 722 break; 723 724 case SSL3_ST_SW_CERT_STATUS_A: 725 case SSL3_ST_SW_CERT_STATUS_B: 726 ret = ssl3_send_cert_status(s); 727 if (ret <= 0) 728 goto end; 729 s->state = SSL3_ST_SW_KEY_EXCH_A; 730 s->init_num = 0; 731 break; 732 733#endif 734 735 case SSL3_ST_SW_CHANGE_A: 736 case SSL3_ST_SW_CHANGE_B: 737 738 s->session->cipher = s->s3->tmp.new_cipher; 739 if (!s->method->ssl3_enc->setup_key_block(s)) { 740 ret = -1; 741 s->state = SSL_ST_ERR; 742 goto end; 743 } 744 745 ret = dtls1_send_change_cipher_spec(s, 746 SSL3_ST_SW_CHANGE_A, 747 SSL3_ST_SW_CHANGE_B); 748 749 if (ret <= 0) 750 goto end; 751 752#ifndef OPENSSL_NO_SCTP 753 if (!s->hit) { 754 /* 755 * Change to new shared key of SCTP-Auth, will be ignored if 756 * no SCTP used. 757 */ 758 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 759 0, NULL); 760 } 761#endif 762 763 s->state = SSL3_ST_SW_FINISHED_A; 764 s->init_num = 0; 765 766 if (!s->method->ssl3_enc->change_cipher_state(s, 767 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 768 { 769 ret = -1; 770 s->state = SSL_ST_ERR; 771 goto end; 772 } 773 774 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 775 break; 776 777 case SSL3_ST_SW_FINISHED_A: 778 case SSL3_ST_SW_FINISHED_B: 779 ret = dtls1_send_finished(s, 780 SSL3_ST_SW_FINISHED_A, 781 SSL3_ST_SW_FINISHED_B, 782 s->method-> 783 ssl3_enc->server_finished_label, 784 s->method-> 785 ssl3_enc->server_finished_label_len); 786 if (ret <= 0) 787 goto end; 788 s->state = SSL3_ST_SW_FLUSH; 789 if (s->hit) { 790 s->s3->tmp.next_state = SSL3_ST_SR_FINISHED_A; 791 792#ifndef OPENSSL_NO_SCTP 793 /* 794 * Change to new shared key of SCTP-Auth, will be ignored if 795 * no SCTP used. 796 */ 797 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 798 0, NULL); 799#endif 800 } else { 801 s->s3->tmp.next_state = SSL_ST_OK; 802#ifndef OPENSSL_NO_SCTP 803 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) { 804 s->d1->next_state = s->s3->tmp.next_state; 805 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 806 } 807#endif 808 } 809 s->init_num = 0; 810 break; 811 812 case SSL_ST_OK: 813 /* clean a few things up */ 814 ssl3_cleanup_key_block(s); 815 816#if 0 817 BUF_MEM_free(s->init_buf); 818 s->init_buf = NULL; 819#endif 820 821 /* remove buffering on output */ 822 ssl_free_wbio_buffer(s); 823 824 s->init_num = 0; 825 826 if (s->renegotiate == 2) { /* skipped if we just sent a 827 * HelloRequest */ 828 s->renegotiate = 0; 829 s->new_session = 0; 830 831 ssl_update_cache(s, SSL_SESS_CACHE_SERVER); 832 833 s->ctx->stats.sess_accept_good++; 834 /* s->server=1; */ 835 s->handshake_func = dtls1_accept; 836 837 if (cb != NULL) 838 cb(s, SSL_CB_HANDSHAKE_DONE, 1); 839 } 840 841 ret = 1; 842 843 /* done handshaking, next message is client hello */ 844 s->d1->handshake_read_seq = 0; 845 /* next message is server hello */ 846 s->d1->handshake_write_seq = 0; 847 s->d1->next_handshake_write_seq = 0; 848 goto end; 849 /* break; */ 850 851 case SSL_ST_ERR: 852 default: 853 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE); 854 ret = -1; 855 goto end; 856 /* break; */ 857 } 858 859 if (!s->s3->tmp.reuse_message && !skip) { 860 if (s->debug) { 861 if ((ret = BIO_flush(s->wbio)) <= 0) 862 goto end; 863 } 864 865 if ((cb != NULL) && (s->state != state)) { 866 new_state = s->state; 867 s->state = state; 868 cb(s, SSL_CB_ACCEPT_LOOP, 1); 869 s->state = new_state; 870 } 871 } 872 skip = 0; 873 } 874 end: 875 /* BIO_flush(s->wbio); */ 876 877 s->in_handshake--; 878#ifndef OPENSSL_NO_SCTP 879 /* 880 * Notify SCTP BIO socket to leave handshake mode and prevent stream 881 * identifier other than 0. Will be ignored if no SCTP is used. 882 */ 883 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, 884 s->in_handshake, NULL); 885#endif 886 887 if (cb != NULL) 888 cb(s, SSL_CB_ACCEPT_EXIT, ret); 889 return (ret); 890} 891 892int dtls1_send_hello_request(SSL *s) 893{ 894 unsigned char *p; 895 896 if (s->state == SSL3_ST_SW_HELLO_REQ_A) { 897 p = (unsigned char *)s->init_buf->data; 898 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 899 900 s->state = SSL3_ST_SW_HELLO_REQ_B; 901 /* number of bytes to write */ 902 s->init_num = DTLS1_HM_HEADER_LENGTH; 903 s->init_off = 0; 904 905 /* 906 * no need to buffer this message, since there are no retransmit 907 * requests for it 908 */ 909 } 910 911 /* SSL3_ST_SW_HELLO_REQ_B */ 912 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 913} 914 915int dtls1_send_hello_verify_request(SSL *s) 916{ 917 unsigned int msg_len; 918 unsigned char *msg, *buf, *p; 919 920 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) { 921 buf = (unsigned char *)s->init_buf->data; 922 923 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 924 *(p++) = s->version >> 8; 925 *(p++) = s->version & 0xFF; 926 927 if (s->ctx->app_gen_cookie_cb == NULL || 928 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 929 &(s->d1->cookie_len)) == 0) { 930 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST, 931 ERR_R_INTERNAL_ERROR); 932 s->state = SSL_ST_ERR; 933 return 0; 934 } 935 936 *(p++) = (unsigned char)s->d1->cookie_len; 937 memcpy(p, s->d1->cookie, s->d1->cookie_len); 938 p += s->d1->cookie_len; 939 msg_len = p - msg; 940 941 dtls1_set_message_header(s, buf, 942 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, 943 msg_len); 944 945 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 946 /* number of bytes to write */ 947 s->init_num = p - buf; 948 s->init_off = 0; 949 } 950 951 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 952 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 953} 954 955int dtls1_send_server_hello(SSL *s) 956{ 957 unsigned char *buf; 958 unsigned char *p, *d; 959 int i; 960 unsigned int sl; 961 unsigned long l; 962 963 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) { 964 buf = (unsigned char *)s->init_buf->data; 965 p = s->s3->server_random; 966 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE); 967 /* Do the message type and length last */ 968 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 969 970 *(p++) = s->version >> 8; 971 *(p++) = s->version & 0xff; 972 973 /* Random stuff */ 974 memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); 975 p += SSL3_RANDOM_SIZE; 976 977 /* 978 * now in theory we have 3 options to sending back the session id. 979 * If it is a re-use, we send back the old session-id, if it is a new 980 * session, we send back the new session-id or we send back a 0 981 * length session-id if we want it to be single use. Currently I will 982 * not implement the '0' length session-id 12-Jan-98 - I'll now 983 * support the '0' length stuff. 984 */ 985 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 986 s->session->session_id_length = 0; 987 988 sl = s->session->session_id_length; 989 if (sl > sizeof s->session->session_id) { 990 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 991 return -1; 992 } 993 *(p++) = sl; 994 memcpy(p, s->session->session_id, sl); 995 p += sl; 996 997 /* put the cipher */ 998 if (s->s3->tmp.new_cipher == NULL) 999 return -1; 1000 i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p); 1001 p += i; 1002 1003 /* put the compression method */ 1004#ifdef OPENSSL_NO_COMP 1005 *(p++) = 0; 1006#else 1007 if (s->s3->tmp.new_compression == NULL) 1008 *(p++) = 0; 1009 else 1010 *(p++) = s->s3->tmp.new_compression->id; 1011#endif 1012 1013#ifndef OPENSSL_NO_TLSEXT 1014 if (ssl_prepare_serverhello_tlsext(s) <= 0) { 1015 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT); 1016 return -1; 1017 } 1018 if ((p = 1019 ssl_add_serverhello_tlsext(s, p, 1020 buf + SSL3_RT_MAX_PLAIN_LENGTH)) == 1021 NULL) { 1022 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 1023 return -1; 1024 } 1025#endif 1026 1027 /* do the header */ 1028 l = (p - d); 1029 d = buf; 1030 1031 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 1032 1033 s->state = SSL3_ST_SW_SRVR_HELLO_B; 1034 /* number of bytes to write */ 1035 s->init_num = p - buf; 1036 s->init_off = 0; 1037 1038 /* buffer the message to handle re-xmits */ 1039 dtls1_buffer_message(s, 0); 1040 } 1041 1042 /* SSL3_ST_SW_SRVR_HELLO_B */ 1043 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1044} 1045 1046int dtls1_send_server_done(SSL *s) 1047{ 1048 unsigned char *p; 1049 1050 if (s->state == SSL3_ST_SW_SRVR_DONE_A) { 1051 p = (unsigned char *)s->init_buf->data; 1052 1053 /* do the header */ 1054 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 1055 1056 s->state = SSL3_ST_SW_SRVR_DONE_B; 1057 /* number of bytes to write */ 1058 s->init_num = DTLS1_HM_HEADER_LENGTH; 1059 s->init_off = 0; 1060 1061 /* buffer the message to handle re-xmits */ 1062 dtls1_buffer_message(s, 0); 1063 } 1064 1065 /* SSL3_ST_SW_SRVR_DONE_B */ 1066 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1067} 1068 1069int dtls1_send_server_key_exchange(SSL *s) 1070{ 1071#ifndef OPENSSL_NO_RSA 1072 unsigned char *q; 1073 int j, num; 1074 RSA *rsa; 1075 unsigned char md_buf[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH]; 1076 unsigned int u; 1077#endif 1078#ifndef OPENSSL_NO_DH 1079 DH *dh = NULL, *dhp; 1080#endif 1081#ifndef OPENSSL_NO_ECDH 1082 EC_KEY *ecdh = NULL, *ecdhp; 1083 unsigned char *encodedPoint = NULL; 1084 int encodedlen = 0; 1085 int curve_id = 0; 1086 BN_CTX *bn_ctx = NULL; 1087#endif 1088 EVP_PKEY *pkey; 1089 unsigned char *p, *d; 1090 int al, i; 1091 unsigned long type; 1092 int n; 1093 CERT *cert; 1094 BIGNUM *r[4]; 1095 int nr[4], kn; 1096 BUF_MEM *buf; 1097 EVP_MD_CTX md_ctx; 1098 1099 EVP_MD_CTX_init(&md_ctx); 1100 if (s->state == SSL3_ST_SW_KEY_EXCH_A) { 1101 type = s->s3->tmp.new_cipher->algorithm_mkey; 1102 cert = s->cert; 1103 1104 buf = s->init_buf; 1105 1106 r[0] = r[1] = r[2] = r[3] = NULL; 1107 n = 0; 1108#ifndef OPENSSL_NO_RSA 1109 if (type & SSL_kRSA) { 1110 rsa = cert->rsa_tmp; 1111 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) { 1112 rsa = s->cert->rsa_tmp_cb(s, 1113 SSL_C_IS_EXPORT(s->s3-> 1114 tmp.new_cipher), 1115 SSL_C_EXPORT_PKEYLENGTH(s->s3-> 1116 tmp.new_cipher)); 1117 if (rsa == NULL) { 1118 al = SSL_AD_HANDSHAKE_FAILURE; 1119 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1120 SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 1121 goto f_err; 1122 } 1123 RSA_up_ref(rsa); 1124 cert->rsa_tmp = rsa; 1125 } 1126 if (rsa == NULL) { 1127 al = SSL_AD_HANDSHAKE_FAILURE; 1128 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1129 SSL_R_MISSING_TMP_RSA_KEY); 1130 goto f_err; 1131 } 1132 r[0] = rsa->n; 1133 r[1] = rsa->e; 1134 s->s3->tmp.use_rsa_tmp = 1; 1135 } else 1136#endif 1137#ifndef OPENSSL_NO_DH 1138 if (type & SSL_kEDH) { 1139 dhp = cert->dh_tmp; 1140 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 1141 dhp = s->cert->dh_tmp_cb(s, 1142 SSL_C_IS_EXPORT(s->s3-> 1143 tmp.new_cipher), 1144 SSL_C_EXPORT_PKEYLENGTH(s->s3-> 1145 tmp.new_cipher)); 1146 if (dhp == NULL) { 1147 al = SSL_AD_HANDSHAKE_FAILURE; 1148 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1149 SSL_R_MISSING_TMP_DH_KEY); 1150 goto f_err; 1151 } 1152 1153 if (s->s3->tmp.dh != NULL) { 1154 DH_free(dh); 1155 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1156 ERR_R_INTERNAL_ERROR); 1157 goto err; 1158 } 1159 1160 if ((dh = DHparams_dup(dhp)) == NULL) { 1161 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_DH_LIB); 1162 goto err; 1163 } 1164 1165 s->s3->tmp.dh = dh; 1166 if ((dhp->pub_key == NULL || 1167 dhp->priv_key == NULL || 1168 (s->options & SSL_OP_SINGLE_DH_USE))) { 1169 if (!DH_generate_key(dh)) { 1170 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1171 ERR_R_DH_LIB); 1172 goto err; 1173 } 1174 } else { 1175 dh->pub_key = BN_dup(dhp->pub_key); 1176 dh->priv_key = BN_dup(dhp->priv_key); 1177 if ((dh->pub_key == NULL) || (dh->priv_key == NULL)) { 1178 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1179 ERR_R_DH_LIB); 1180 goto err; 1181 } 1182 } 1183 r[0] = dh->p; 1184 r[1] = dh->g; 1185 r[2] = dh->pub_key; 1186 } else 1187#endif 1188#ifndef OPENSSL_NO_ECDH 1189 if (type & SSL_kEECDH) { 1190 const EC_GROUP *group; 1191 1192 ecdhp = cert->ecdh_tmp; 1193 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) { 1194 ecdhp = s->cert->ecdh_tmp_cb(s, 1195 SSL_C_IS_EXPORT(s->s3-> 1196 tmp.new_cipher), 1197 SSL_C_EXPORT_PKEYLENGTH(s-> 1198 s3->tmp.new_cipher)); 1199 } 1200 if (ecdhp == NULL) { 1201 al = SSL_AD_HANDSHAKE_FAILURE; 1202 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1203 SSL_R_MISSING_TMP_ECDH_KEY); 1204 goto f_err; 1205 } 1206 1207 if (s->s3->tmp.ecdh != NULL) { 1208 EC_KEY_free(s->s3->tmp.ecdh); 1209 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1210 ERR_R_INTERNAL_ERROR); 1211 goto err; 1212 } 1213 1214 /* Duplicate the ECDH structure. */ 1215 if (ecdhp == NULL) { 1216 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1217 goto err; 1218 } 1219 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) { 1220 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1221 goto err; 1222 } 1223 1224 s->s3->tmp.ecdh = ecdh; 1225 if ((EC_KEY_get0_public_key(ecdh) == NULL) || 1226 (EC_KEY_get0_private_key(ecdh) == NULL) || 1227 (s->options & SSL_OP_SINGLE_ECDH_USE)) { 1228 if (!EC_KEY_generate_key(ecdh)) { 1229 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1230 ERR_R_ECDH_LIB); 1231 goto err; 1232 } 1233 } 1234 1235 if (((group = EC_KEY_get0_group(ecdh)) == NULL) || 1236 (EC_KEY_get0_public_key(ecdh) == NULL) || 1237 (EC_KEY_get0_private_key(ecdh) == NULL)) { 1238 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1239 goto err; 1240 } 1241 1242 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1243 (EC_GROUP_get_degree(group) > 163)) { 1244 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1245 SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1246 goto err; 1247 } 1248 1249 /* 1250 * XXX: For now, we only support ephemeral ECDH keys over named 1251 * (not generic) curves. For supported named curves, curve_id is 1252 * non-zero. 1253 */ 1254 if ((curve_id = 1255 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) 1256 == 0) { 1257 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1258 SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1259 goto err; 1260 } 1261 1262 /* 1263 * Encode the public key. First check the size of encoding and 1264 * allocate memory accordingly. 1265 */ 1266 encodedlen = EC_POINT_point2oct(group, 1267 EC_KEY_get0_public_key(ecdh), 1268 POINT_CONVERSION_UNCOMPRESSED, 1269 NULL, 0, NULL); 1270 1271 encodedPoint = (unsigned char *) 1272 OPENSSL_malloc(encodedlen * sizeof(unsigned char)); 1273 bn_ctx = BN_CTX_new(); 1274 if ((encodedPoint == NULL) || (bn_ctx == NULL)) { 1275 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1276 ERR_R_MALLOC_FAILURE); 1277 goto err; 1278 } 1279 1280 encodedlen = EC_POINT_point2oct(group, 1281 EC_KEY_get0_public_key(ecdh), 1282 POINT_CONVERSION_UNCOMPRESSED, 1283 encodedPoint, encodedlen, bn_ctx); 1284 1285 if (encodedlen == 0) { 1286 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); 1287 goto err; 1288 } 1289 1290 BN_CTX_free(bn_ctx); 1291 bn_ctx = NULL; 1292 1293 /* 1294 * XXX: For now, we only support named (not generic) curves in 1295 * ECDH ephemeral key exchanges. In this situation, we need four 1296 * additional bytes to encode the entire ServerECDHParams 1297 * structure. 1298 */ 1299 n = 4 + encodedlen; 1300 1301 /* 1302 * We'll generate the serverKeyExchange message explicitly so we 1303 * can set these to NULLs 1304 */ 1305 r[0] = NULL; 1306 r[1] = NULL; 1307 r[2] = NULL; 1308 r[3] = NULL; 1309 } else 1310#endif /* !OPENSSL_NO_ECDH */ 1311#ifndef OPENSSL_NO_PSK 1312 if (type & SSL_kPSK) { 1313 /* 1314 * reserve size for record length and PSK identity hint 1315 */ 1316 n += 2 + strlen(s->ctx->psk_identity_hint); 1317 } else 1318#endif /* !OPENSSL_NO_PSK */ 1319 { 1320 al = SSL_AD_HANDSHAKE_FAILURE; 1321 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1322 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1323 goto f_err; 1324 } 1325 for (i = 0; r[i] != NULL; i++) { 1326 nr[i] = BN_num_bytes(r[i]); 1327 n += 2 + nr[i]; 1328 } 1329 1330 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 1331 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { 1332 if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, NULL)) 1333 == NULL) { 1334 al = SSL_AD_DECODE_ERROR; 1335 goto f_err; 1336 } 1337 kn = EVP_PKEY_size(pkey); 1338 } else { 1339 pkey = NULL; 1340 kn = 0; 1341 } 1342 1343 if (!BUF_MEM_grow_clean(buf, n + DTLS1_HM_HEADER_LENGTH + kn)) { 1344 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF); 1345 goto err; 1346 } 1347 d = (unsigned char *)s->init_buf->data; 1348 p = &(d[DTLS1_HM_HEADER_LENGTH]); 1349 1350 for (i = 0; r[i] != NULL; i++) { 1351 s2n(nr[i], p); 1352 BN_bn2bin(r[i], p); 1353 p += nr[i]; 1354 } 1355 1356#ifndef OPENSSL_NO_ECDH 1357 if (type & SSL_kEECDH) { 1358 /* 1359 * XXX: For now, we only support named (not generic) curves. In 1360 * this situation, the serverKeyExchange message has: [1 byte 1361 * CurveType], [2 byte CurveName] [1 byte length of encoded 1362 * point], followed by the actual encoded point itself 1363 */ 1364 *p = NAMED_CURVE_TYPE; 1365 p += 1; 1366 *p = 0; 1367 p += 1; 1368 *p = curve_id; 1369 p += 1; 1370 *p = encodedlen; 1371 p += 1; 1372 memcpy((unsigned char *)p, 1373 (unsigned char *)encodedPoint, encodedlen); 1374 OPENSSL_free(encodedPoint); 1375 encodedPoint = NULL; 1376 p += encodedlen; 1377 } 1378#endif 1379 1380#ifndef OPENSSL_NO_PSK 1381 if (type & SSL_kPSK) { 1382 /* copy PSK identity hint */ 1383 s2n(strlen(s->ctx->psk_identity_hint), p); 1384 strncpy((char *)p, s->ctx->psk_identity_hint, 1385 strlen(s->ctx->psk_identity_hint)); 1386 p += strlen(s->ctx->psk_identity_hint); 1387 } 1388#endif 1389 1390 /* not anonymous */ 1391 if (pkey != NULL) { 1392 /* 1393 * n is the length of the params, they start at 1394 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space at the 1395 * end. 1396 */ 1397#ifndef OPENSSL_NO_RSA 1398 if (pkey->type == EVP_PKEY_RSA) { 1399 q = md_buf; 1400 j = 0; 1401 for (num = 2; num > 0; num--) { 1402 EVP_DigestInit_ex(&md_ctx, (num == 2) 1403 ? s->ctx->md5 : s->ctx->sha1, NULL); 1404 EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]), 1405 SSL3_RANDOM_SIZE); 1406 EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]), 1407 SSL3_RANDOM_SIZE); 1408 EVP_DigestUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), 1409 n); 1410 EVP_DigestFinal_ex(&md_ctx, q, (unsigned int *)&i); 1411 q += i; 1412 j += i; 1413 } 1414 if (RSA_sign(NID_md5_sha1, md_buf, j, 1415 &(p[2]), &u, pkey->pkey.rsa) <= 0) { 1416 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_RSA); 1417 goto err; 1418 } 1419 s2n(u, p); 1420 n += u + 2; 1421 } else 1422#endif 1423#if !defined(OPENSSL_NO_DSA) 1424 if (pkey->type == EVP_PKEY_DSA) { 1425 /* lets do DSS */ 1426 EVP_SignInit_ex(&md_ctx, EVP_dss1(), NULL); 1427 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]), 1428 SSL3_RANDOM_SIZE); 1429 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]), 1430 SSL3_RANDOM_SIZE); 1431 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n); 1432 if (!EVP_SignFinal(&md_ctx, &(p[2]), 1433 (unsigned int *)&i, pkey)) { 1434 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_DSA); 1435 goto err; 1436 } 1437 s2n(i, p); 1438 n += i + 2; 1439 } else 1440#endif 1441#if !defined(OPENSSL_NO_ECDSA) 1442 if (pkey->type == EVP_PKEY_EC) { 1443 /* let's do ECDSA */ 1444 EVP_SignInit_ex(&md_ctx, EVP_ecdsa(), NULL); 1445 EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]), 1446 SSL3_RANDOM_SIZE); 1447 EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]), 1448 SSL3_RANDOM_SIZE); 1449 EVP_SignUpdate(&md_ctx, &(d[DTLS1_HM_HEADER_LENGTH]), n); 1450 if (!EVP_SignFinal(&md_ctx, &(p[2]), 1451 (unsigned int *)&i, pkey)) { 1452 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1453 ERR_LIB_ECDSA); 1454 goto err; 1455 } 1456 s2n(i, p); 1457 n += i + 2; 1458 } else 1459#endif 1460 { 1461 /* Is this error check actually needed? */ 1462 al = SSL_AD_HANDSHAKE_FAILURE; 1463 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1464 SSL_R_UNKNOWN_PKEY_TYPE); 1465 goto f_err; 1466 } 1467 } 1468 1469 d = dtls1_set_message_header(s, d, 1470 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1471 1472 /* 1473 * we should now have things packed up, so lets send it off 1474 */ 1475 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1476 s->init_off = 0; 1477 1478 /* buffer the message to handle re-xmits */ 1479 dtls1_buffer_message(s, 0); 1480 } 1481 1482 s->state = SSL3_ST_SW_KEY_EXCH_B; 1483 EVP_MD_CTX_cleanup(&md_ctx); 1484 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1485 f_err: 1486 ssl3_send_alert(s, SSL3_AL_FATAL, al); 1487 err: 1488#ifndef OPENSSL_NO_ECDH 1489 if (encodedPoint != NULL) 1490 OPENSSL_free(encodedPoint); 1491 BN_CTX_free(bn_ctx); 1492#endif 1493 EVP_MD_CTX_cleanup(&md_ctx); 1494 return (-1); 1495} 1496 1497int dtls1_send_certificate_request(SSL *s) 1498{ 1499 unsigned char *p, *d; 1500 int i, j, nl, off, n; 1501 STACK_OF(X509_NAME) *sk = NULL; 1502 X509_NAME *name; 1503 BUF_MEM *buf; 1504 unsigned int msg_len; 1505 1506 if (s->state == SSL3_ST_SW_CERT_REQ_A) { 1507 buf = s->init_buf; 1508 1509 d = p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1510 1511 /* get the list of acceptable cert types */ 1512 p++; 1513 n = ssl3_get_req_cert_type(s, p); 1514 d[0] = n; 1515 p += n; 1516 n++; 1517 1518 off = n; 1519 p += 2; 1520 n += 2; 1521 1522 sk = SSL_get_client_CA_list(s); 1523 nl = 0; 1524 if (sk != NULL) { 1525 for (i = 0; i < sk_X509_NAME_num(sk); i++) { 1526 name = sk_X509_NAME_value(sk, i); 1527 j = i2d_X509_NAME(name, NULL); 1528 if (!BUF_MEM_grow_clean 1529 (buf, DTLS1_HM_HEADER_LENGTH + n + j + 2)) { 1530 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST, 1531 ERR_R_BUF_LIB); 1532 goto err; 1533 } 1534 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + n]); 1535 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) { 1536 s2n(j, p); 1537 i2d_X509_NAME(name, &p); 1538 n += 2 + j; 1539 nl += 2 + j; 1540 } else { 1541 d = p; 1542 i2d_X509_NAME(name, &p); 1543 j -= 2; 1544 s2n(j, d); 1545 j += 2; 1546 n += j; 1547 nl += j; 1548 } 1549 } 1550 } 1551 /* else no CA names */ 1552 p = (unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH + off]); 1553 s2n(nl, p); 1554 1555 d = (unsigned char *)buf->data; 1556 *(d++) = SSL3_MT_CERTIFICATE_REQUEST; 1557 l2n3(n, d); 1558 s2n(s->d1->handshake_write_seq, d); 1559 s->d1->handshake_write_seq++; 1560 1561 /* 1562 * we should now have things packed up, so lets send it off 1563 */ 1564 1565 s->init_num = n + DTLS1_HM_HEADER_LENGTH; 1566 s->init_off = 0; 1567#ifdef NETSCAPE_HANG_BUG 1568/* XXX: what to do about this? */ 1569 p = (unsigned char *)s->init_buf->data + s->init_num; 1570 1571 /* do the header */ 1572 *(p++) = SSL3_MT_SERVER_DONE; 1573 *(p++) = 0; 1574 *(p++) = 0; 1575 *(p++) = 0; 1576 s->init_num += 4; 1577#endif 1578 1579 /* XDTLS: set message header ? */ 1580 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1581 dtls1_set_message_header(s, (void *)s->init_buf->data, 1582 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, 1583 msg_len); 1584 1585 /* buffer the message to handle re-xmits */ 1586 dtls1_buffer_message(s, 0); 1587 1588 s->state = SSL3_ST_SW_CERT_REQ_B; 1589 } 1590 1591 /* SSL3_ST_SW_CERT_REQ_B */ 1592 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1593 err: 1594 return (-1); 1595} 1596 1597int dtls1_send_server_certificate(SSL *s) 1598{ 1599 unsigned long l; 1600 X509 *x; 1601 1602 if (s->state == SSL3_ST_SW_CERT_A) { 1603 x = ssl_get_server_send_cert(s); 1604 if (x == NULL) { 1605 /* VRS: allow null cert if auth == KRB5 */ 1606 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || 1607 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) { 1608 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, 1609 ERR_R_INTERNAL_ERROR); 1610 return (0); 1611 } 1612 } 1613 1614 l = dtls1_output_cert_chain(s, x); 1615 if (!l) { 1616 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); 1617 return (0); 1618 } 1619 s->state = SSL3_ST_SW_CERT_B; 1620 s->init_num = (int)l; 1621 s->init_off = 0; 1622 1623 /* buffer the message to handle re-xmits */ 1624 dtls1_buffer_message(s, 0); 1625 } 1626 1627 /* SSL3_ST_SW_CERT_B */ 1628 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1629} 1630 1631#ifndef OPENSSL_NO_TLSEXT 1632int dtls1_send_newsession_ticket(SSL *s) 1633{ 1634 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) { 1635 unsigned char *p, *senc, *macstart; 1636 int len, slen; 1637 unsigned int hlen, msg_len; 1638 EVP_CIPHER_CTX ctx; 1639 HMAC_CTX hctx; 1640 SSL_CTX *tctx = s->initial_ctx; 1641 unsigned char iv[EVP_MAX_IV_LENGTH]; 1642 unsigned char key_name[16]; 1643 1644 /* get session encoding length */ 1645 slen = i2d_SSL_SESSION(s->session, NULL); 1646 /* 1647 * Some length values are 16 bits, so forget it if session is too 1648 * long 1649 */ 1650 if (slen > 0xFF00) 1651 return -1; 1652 /* 1653 * Grow buffer if need be: the length calculation is as follows 12 1654 * (DTLS handshake message header) + 4 (ticket lifetime hint) + 2 1655 * (ticket length) + 16 (key name) + max_iv_len (iv length) + 1656 * session_length + max_enc_block_size (max encrypted session length) 1657 * + max_md_size (HMAC). 1658 */ 1659 if (!BUF_MEM_grow(s->init_buf, 1660 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1661 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1662 return -1; 1663 senc = OPENSSL_malloc(slen); 1664 if (!senc) 1665 return -1; 1666 p = senc; 1667 i2d_SSL_SESSION(s->session, &p); 1668 1669 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1670 EVP_CIPHER_CTX_init(&ctx); 1671 HMAC_CTX_init(&hctx); 1672 /* 1673 * Initialize HMAC and cipher contexts. If callback present it does 1674 * all the work otherwise use generated values from parent ctx. 1675 */ 1676 if (tctx->tlsext_ticket_key_cb) { 1677 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1678 &hctx, 1) < 0) { 1679 OPENSSL_free(senc); 1680 return -1; 1681 } 1682 } else { 1683 RAND_pseudo_bytes(iv, 16); 1684 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1685 tctx->tlsext_tick_aes_key, iv); 1686 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1687 tlsext_tick_md(), NULL); 1688 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1689 } 1690 l2n(s->session->tlsext_tick_lifetime_hint, p); 1691 /* Skip ticket length for now */ 1692 p += 2; 1693 /* Output key name */ 1694 macstart = p; 1695 memcpy(p, key_name, 16); 1696 p += 16; 1697 /* output IV */ 1698 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1699 p += EVP_CIPHER_CTX_iv_length(&ctx); 1700 /* Encrypt session data */ 1701 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1702 p += len; 1703 EVP_EncryptFinal(&ctx, p, &len); 1704 p += len; 1705 EVP_CIPHER_CTX_cleanup(&ctx); 1706 1707 HMAC_Update(&hctx, macstart, p - macstart); 1708 HMAC_Final(&hctx, p, &hlen); 1709 HMAC_CTX_cleanup(&hctx); 1710 1711 p += hlen; 1712 /* Now write out lengths: p points to end of data written */ 1713 /* Total length */ 1714 len = p - (unsigned char *)(s->init_buf->data); 1715 /* Ticket length */ 1716 p = (unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1717 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1718 1719 /* number of bytes to write */ 1720 s->init_num = len; 1721 s->state = SSL3_ST_SW_SESSION_TICKET_B; 1722 s->init_off = 0; 1723 OPENSSL_free(senc); 1724 1725 /* XDTLS: set message header ? */ 1726 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1727 dtls1_set_message_header(s, (void *)s->init_buf->data, 1728 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, 1729 msg_len); 1730 1731 /* buffer the message to handle re-xmits */ 1732 dtls1_buffer_message(s, 0); 1733 } 1734 1735 /* SSL3_ST_SW_SESSION_TICKET_B */ 1736 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE)); 1737} 1738#endif 1739