d1_srvr.c revision 279264
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, 143 dtls1_get_server_method) 144 145int dtls1_accept(SSL *s) 146 { 147 BUF_MEM *buf; 148 unsigned long Time=(unsigned long)time(NULL); 149 void (*cb)(const SSL *ssl,int type,int val)=NULL; 150 unsigned long alg_k; 151 int ret= -1; 152 int new_state,state,skip=0; 153 int listen; 154#ifndef OPENSSL_NO_SCTP 155 unsigned char sctpauthkey[64]; 156 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)]; 157#endif 158 159 RAND_add(&Time,sizeof(Time),0); 160 ERR_clear_error(); 161 clear_sys_error(); 162 163 if (s->info_callback != NULL) 164 cb=s->info_callback; 165 else if (s->ctx->info_callback != NULL) 166 cb=s->ctx->info_callback; 167 168 listen = s->d1->listen; 169 170 /* init things to blank */ 171 s->in_handshake++; 172 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 173 174 s->d1->listen = listen; 175#ifndef OPENSSL_NO_SCTP 176 /* Notify SCTP BIO socket to enter handshake 177 * mode and prevent stream identifier other 178 * 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, s->in_handshake, NULL); 181#endif 182 183 if (s->cert == NULL) 184 { 185 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET); 186 return(-1); 187 } 188 189#ifndef OPENSSL_NO_HEARTBEATS 190 /* If we're awaiting a HeartbeatResponse, pretend we 191 * already got and don't await it anymore, because 192 * Heartbeats don't make sense during handshakes anyway. 193 */ 194 if (s->tlsext_hb_pending) 195 { 196 dtls1_stop_timer(s); 197 s->tlsext_hb_pending = 0; 198 s->tlsext_hb_seq++; 199 } 200#endif 201 202 for (;;) 203 { 204 state=s->state; 205 206 switch (s->state) 207 { 208 case SSL_ST_RENEGOTIATE: 209 s->renegotiate=1; 210 /* s->state=SSL_ST_ACCEPT; */ 211 212 case SSL_ST_BEFORE: 213 case SSL_ST_ACCEPT: 214 case SSL_ST_BEFORE|SSL_ST_ACCEPT: 215 case SSL_ST_OK|SSL_ST_ACCEPT: 216 217 s->server=1; 218 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); 219 220 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) 221 { 222 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR); 223 return -1; 224 } 225 s->type=SSL_ST_ACCEPT; 226 227 if (s->init_buf == NULL) 228 { 229 if ((buf=BUF_MEM_new()) == NULL) 230 { 231 ret= -1; 232 goto end; 233 } 234 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) 235 { 236 BUF_MEM_free(buf); 237 ret= -1; 238 goto end; 239 } 240 s->init_buf=buf; 241 } 242 243 if (!ssl3_setup_buffers(s)) 244 { 245 ret= -1; 246 goto end; 247 } 248 249 s->init_num=0; 250 s->d1->change_cipher_spec_ok = 0; 251 /* Should have been reset by ssl3_get_finished, too. */ 252 s->s3->change_cipher_spec = 0; 253 254 if (s->state != SSL_ST_RENEGOTIATE) 255 { 256 /* Ok, we now need to push on a buffering BIO so that 257 * the output is sent in a way that TCP likes :-) 258 * ...but not with SCTP :-) 259 */ 260#ifndef OPENSSL_NO_SCTP 261 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) 262#endif 263 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } 264 265 ssl3_init_finished_mac(s); 266 s->state=SSL3_ST_SR_CLNT_HELLO_A; 267 s->ctx->stats.sess_accept++; 268 } 269 else 270 { 271 /* s->state == SSL_ST_RENEGOTIATE, 272 * we will just send a HelloRequest */ 273 s->ctx->stats.sess_accept_renegotiate++; 274 s->state=SSL3_ST_SW_HELLO_REQ_A; 275 } 276 277 break; 278 279 case SSL3_ST_SW_HELLO_REQ_A: 280 case SSL3_ST_SW_HELLO_REQ_B: 281 282 s->shutdown=0; 283 dtls1_clear_record_buffer(s); 284 dtls1_start_timer(s); 285 ret=dtls1_send_hello_request(s); 286 if (ret <= 0) goto end; 287 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 288 s->state=SSL3_ST_SW_FLUSH; 289 s->init_num=0; 290 291 ssl3_init_finished_mac(s); 292 break; 293 294 case SSL3_ST_SW_HELLO_REQ_C: 295 s->state=SSL_ST_OK; 296 break; 297 298 case SSL3_ST_SR_CLNT_HELLO_A: 299 case SSL3_ST_SR_CLNT_HELLO_B: 300 case SSL3_ST_SR_CLNT_HELLO_C: 301 302 s->shutdown=0; 303 ret=ssl3_get_client_hello(s); 304 if (ret <= 0) goto end; 305 dtls1_stop_timer(s); 306 307 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 308 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 309 else 310 s->state = SSL3_ST_SW_SRVR_HELLO_A; 311 312 s->init_num=0; 313 314 /* Reflect ClientHello sequence to remain stateless while listening */ 315 if (listen) 316 { 317 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence)); 318 } 319 320 /* If we're just listening, stop here */ 321 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) 322 { 323 ret = 2; 324 s->d1->listen = 0; 325 /* Set expected sequence numbers 326 * to continue the handshake. 327 */ 328 s->d1->handshake_read_seq = 2; 329 s->d1->handshake_write_seq = 1; 330 s->d1->next_handshake_write_seq = 1; 331 goto end; 332 } 333 334 break; 335 336 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 337 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 338 339 ret = dtls1_send_hello_verify_request(s); 340 if ( ret <= 0) goto end; 341 s->state=SSL3_ST_SW_FLUSH; 342 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 343 344 /* HelloVerifyRequest resets Finished MAC */ 345 if (s->version != DTLS1_BAD_VER) 346 ssl3_init_finished_mac(s); 347 break; 348 349#ifndef OPENSSL_NO_SCTP 350 case DTLS1_SCTP_ST_SR_READ_SOCK: 351 352 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) 353 { 354 s->s3->in_read_app_data=2; 355 s->rwstate=SSL_READING; 356 BIO_clear_retry_flags(SSL_get_rbio(s)); 357 BIO_set_retry_read(SSL_get_rbio(s)); 358 ret = -1; 359 goto end; 360 } 361 362 s->state=SSL3_ST_SR_FINISHED_A; 363 break; 364 365 case DTLS1_SCTP_ST_SW_WRITE_SOCK: 366 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 367 if (ret < 0) goto end; 368 369 if (ret == 0) 370 { 371 if (s->d1->next_state != SSL_ST_OK) 372 { 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 } 381 382 s->state=s->d1->next_state; 383 break; 384#endif 385 386 case SSL3_ST_SW_SRVR_HELLO_A: 387 case SSL3_ST_SW_SRVR_HELLO_B: 388 s->renegotiate = 2; 389 dtls1_start_timer(s); 390 ret=dtls1_send_server_hello(s); 391 if (ret <= 0) goto end; 392 393 if (s->hit) 394 { 395#ifndef OPENSSL_NO_SCTP 396 /* Add new shared key for SCTP-Auth, 397 * will be ignored if no SCTP used. 398 */ 399 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 400 DTLS1_SCTP_AUTH_LABEL); 401 402 SSL_export_keying_material(s, sctpauthkey, 403 sizeof(sctpauthkey), labelbuffer, 404 sizeof(labelbuffer), NULL, 0, 0); 405 406 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 407 sizeof(sctpauthkey), sctpauthkey); 408#endif 409#ifndef OPENSSL_NO_TLSEXT 410 if (s->tlsext_ticket_expected) 411 s->state=SSL3_ST_SW_SESSION_TICKET_A; 412 else 413 s->state=SSL3_ST_SW_CHANGE_A; 414#else 415 s->state=SSL3_ST_SW_CHANGE_A; 416#endif 417 } 418 else 419 s->state=SSL3_ST_SW_CERT_A; 420 s->init_num=0; 421 break; 422 423 case SSL3_ST_SW_CERT_A: 424 case SSL3_ST_SW_CERT_B: 425 /* Check if it is anon DH or normal PSK */ 426 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 427 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 428 { 429 dtls1_start_timer(s); 430 ret=dtls1_send_server_certificate(s); 431 if (ret <= 0) goto end; 432#ifndef OPENSSL_NO_TLSEXT 433 if (s->tlsext_status_expected) 434 s->state=SSL3_ST_SW_CERT_STATUS_A; 435 else 436 s->state=SSL3_ST_SW_KEY_EXCH_A; 437 } 438 else 439 { 440 skip = 1; 441 s->state=SSL3_ST_SW_KEY_EXCH_A; 442 } 443#else 444 } 445 else 446 skip=1; 447 448 s->state=SSL3_ST_SW_KEY_EXCH_A; 449#endif 450 s->init_num=0; 451 break; 452 453 case SSL3_ST_SW_KEY_EXCH_A: 454 case SSL3_ST_SW_KEY_EXCH_B: 455 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 456 457 /* 458 * clear this, it may get reset by 459 * send_server_key_exchange 460 */ 461 s->s3->tmp.use_rsa_tmp=0; 462 463 /* only send if a DH key exchange or 464 * RSA but we have a sign only certificate */ 465 if (0 466 /* PSK: send ServerKeyExchange if PSK identity 467 * hint if provided */ 468#ifndef OPENSSL_NO_PSK 469 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint) 470#endif 471 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 472 || (alg_k & SSL_kEECDH) 473 || ((alg_k & SSL_kRSA) 474 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 475 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 476 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 477 ) 478 ) 479 ) 480 ) 481 { 482 dtls1_start_timer(s); 483 ret=dtls1_send_server_key_exchange(s); 484 if (ret <= 0) goto end; 485 } 486 else 487 skip=1; 488 489 s->state=SSL3_ST_SW_CERT_REQ_A; 490 s->init_num=0; 491 break; 492 493 case SSL3_ST_SW_CERT_REQ_A: 494 case SSL3_ST_SW_CERT_REQ_B: 495 if (/* don't request cert unless asked for it: */ 496 !(s->verify_mode & SSL_VERIFY_PEER) || 497 /* if SSL_VERIFY_CLIENT_ONCE is set, 498 * don't request cert during re-negotiation: */ 499 ((s->session->peer != NULL) && 500 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 501 /* never request cert in anonymous ciphersuites 502 * (see section "Certificate request" in SSL 3 drafts 503 * and in RFC 2246): */ 504 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 505 /* ... except when the application insists on verification 506 * (against the specs, but s3_clnt.c accepts this for SSL 3) */ 507 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 508 /* never request cert in Kerberos ciphersuites */ 509 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 510 /* With normal PSK Certificates and 511 * Certificate Requests are omitted */ 512 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 513 { 514 /* no cert request */ 515 skip=1; 516 s->s3->tmp.cert_request=0; 517 s->state=SSL3_ST_SW_SRVR_DONE_A; 518#ifndef OPENSSL_NO_SCTP 519 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 520 { 521 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 522 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 523 } 524#endif 525 } 526 else 527 { 528 s->s3->tmp.cert_request=1; 529 dtls1_start_timer(s); 530 ret=dtls1_send_certificate_request(s); 531 if (ret <= 0) goto end; 532#ifndef NETSCAPE_HANG_BUG 533 s->state=SSL3_ST_SW_SRVR_DONE_A; 534#ifndef OPENSSL_NO_SCTP 535 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 536 { 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->state=SSL3_ST_SW_FLUSH; 543 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 544#ifndef OPENSSL_NO_SCTP 545 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 546 { 547 s->d1->next_state = s->s3->tmp.next_state; 548 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 549 } 550#endif 551#endif 552 s->init_num=0; 553 } 554 break; 555 556 case SSL3_ST_SW_SRVR_DONE_A: 557 case SSL3_ST_SW_SRVR_DONE_B: 558 dtls1_start_timer(s); 559 ret=dtls1_send_server_done(s); 560 if (ret <= 0) goto end; 561 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 562 s->state=SSL3_ST_SW_FLUSH; 563 s->init_num=0; 564 break; 565 566 case SSL3_ST_SW_FLUSH: 567 s->rwstate=SSL_WRITING; 568 if (BIO_flush(s->wbio) <= 0) 569 { 570 /* If the write error was fatal, stop trying */ 571 if (!BIO_should_retry(s->wbio)) 572 { 573 s->rwstate=SSL_NOTHING; 574 s->state=s->s3->tmp.next_state; 575 } 576 577 ret= -1; 578 goto end; 579 } 580 s->rwstate=SSL_NOTHING; 581 s->state=s->s3->tmp.next_state; 582 break; 583 584 case SSL3_ST_SR_CERT_A: 585 case SSL3_ST_SR_CERT_B: 586 /* Check for second client hello (MS SGC) */ 587 ret = ssl3_check_client_hello(s); 588 if (ret <= 0) 589 goto end; 590 if (ret == 2) 591 { 592 dtls1_stop_timer(s); 593 s->state = SSL3_ST_SR_CLNT_HELLO_C; 594 } 595 else { 596 if (s->s3->tmp.cert_request) 597 { 598 ret=ssl3_get_client_certificate(s); 599 if (ret <= 0) goto end; 600 } 601 s->init_num=0; 602 s->state=SSL3_ST_SR_KEY_EXCH_A; 603 } 604 break; 605 606 case SSL3_ST_SR_KEY_EXCH_A: 607 case SSL3_ST_SR_KEY_EXCH_B: 608 ret=ssl3_get_client_key_exchange(s); 609 if (ret <= 0) goto end; 610#ifndef OPENSSL_NO_SCTP 611 /* Add new shared key for SCTP-Auth, 612 * will be ignored if no SCTP used. 613 */ 614 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 615 DTLS1_SCTP_AUTH_LABEL); 616 617 SSL_export_keying_material(s, sctpauthkey, 618 sizeof(sctpauthkey), labelbuffer, 619 sizeof(labelbuffer), NULL, 0, 0); 620 621 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 622 sizeof(sctpauthkey), sctpauthkey); 623#endif 624 625 s->state=SSL3_ST_SR_CERT_VRFY_A; 626 s->init_num=0; 627 628 if (ret == 2) 629 { 630 /* For the ECDH ciphersuites when 631 * the client sends its ECDH pub key in 632 * a certificate, the CertificateVerify 633 * message is not sent. 634 */ 635 s->state=SSL3_ST_SR_FINISHED_A; 636 s->init_num = 0; 637 } 638 else 639 { 640 s->state=SSL3_ST_SR_CERT_VRFY_A; 641 s->init_num=0; 642 643 /* We need to get hashes here so if there is 644 * a client cert, it can be verified */ 645 s->method->ssl3_enc->cert_verify_mac(s, 646 NID_md5, 647 &(s->s3->tmp.cert_verify_md[0])); 648 s->method->ssl3_enc->cert_verify_mac(s, 649 NID_sha1, 650 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); 651 } 652 break; 653 654 case SSL3_ST_SR_CERT_VRFY_A: 655 case SSL3_ST_SR_CERT_VRFY_B: 656 /* 657 * This *should* be the first time we enable CCS, but be 658 * extra careful about surrounding code changes. We need 659 * to set this here because we don't know if we're 660 * expecting a CertificateVerify or not. 661 */ 662 if (!s->s3->change_cipher_spec) 663 s->d1->change_cipher_spec_ok = 1; 664 /* we should decide if we expected this one */ 665 ret=ssl3_get_cert_verify(s); 666 if (ret <= 0) goto end; 667#ifndef OPENSSL_NO_SCTP 668 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 669 state == SSL_ST_RENEGOTIATE) 670 s->state=DTLS1_SCTP_ST_SR_READ_SOCK; 671 else 672#endif 673 s->state=SSL3_ST_SR_FINISHED_A; 674 s->init_num=0; 675 break; 676 677 case SSL3_ST_SR_FINISHED_A: 678 case SSL3_ST_SR_FINISHED_B: 679 /* 680 * Enable CCS for resumed handshakes. 681 * In a full handshake, we end up here through 682 * SSL3_ST_SR_CERT_VRFY_B, so change_cipher_spec_ok was 683 * already set. Receiving a CCS clears the flag, so make 684 * sure not to re-enable it to ban duplicates. 685 * s->s3->change_cipher_spec is set when a CCS is 686 * processed in d1_pkt.c, and remains set until 687 * the client's Finished message is read. 688 */ 689 if (!s->s3->change_cipher_spec) 690 s->d1->change_cipher_spec_ok = 1; 691 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, 692 SSL3_ST_SR_FINISHED_B); 693 if (ret <= 0) goto end; 694 dtls1_stop_timer(s); 695 if (s->hit) 696 s->state=SSL_ST_OK; 697#ifndef OPENSSL_NO_TLSEXT 698 else if (s->tlsext_ticket_expected) 699 s->state=SSL3_ST_SW_SESSION_TICKET_A; 700#endif 701 else 702 s->state=SSL3_ST_SW_CHANGE_A; 703 s->init_num=0; 704 break; 705 706#ifndef OPENSSL_NO_TLSEXT 707 case SSL3_ST_SW_SESSION_TICKET_A: 708 case SSL3_ST_SW_SESSION_TICKET_B: 709 ret=dtls1_send_newsession_ticket(s); 710 if (ret <= 0) goto end; 711 s->state=SSL3_ST_SW_CHANGE_A; 712 s->init_num=0; 713 break; 714 715 case SSL3_ST_SW_CERT_STATUS_A: 716 case SSL3_ST_SW_CERT_STATUS_B: 717 ret=ssl3_send_cert_status(s); 718 if (ret <= 0) goto end; 719 s->state=SSL3_ST_SW_KEY_EXCH_A; 720 s->init_num=0; 721 break; 722 723#endif 724 725 case SSL3_ST_SW_CHANGE_A: 726 case SSL3_ST_SW_CHANGE_B: 727 728 s->session->cipher=s->s3->tmp.new_cipher; 729 if (!s->method->ssl3_enc->setup_key_block(s)) 730 { ret= -1; goto end; } 731 732 ret=dtls1_send_change_cipher_spec(s, 733 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); 734 735 if (ret <= 0) goto end; 736 737#ifndef OPENSSL_NO_SCTP 738 if (!s->hit) 739 { 740 /* Change to new shared key of SCTP-Auth, 741 * will be ignored if no SCTP used. 742 */ 743 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 744 } 745#endif 746 747 s->state=SSL3_ST_SW_FINISHED_A; 748 s->init_num=0; 749 750 if (!s->method->ssl3_enc->change_cipher_state(s, 751 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 752 { 753 ret= -1; 754 goto end; 755 } 756 757 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 758 break; 759 760 case SSL3_ST_SW_FINISHED_A: 761 case SSL3_ST_SW_FINISHED_B: 762 ret=dtls1_send_finished(s, 763 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, 764 s->method->ssl3_enc->server_finished_label, 765 s->method->ssl3_enc->server_finished_label_len); 766 if (ret <= 0) goto end; 767 s->state=SSL3_ST_SW_FLUSH; 768 if (s->hit) 769 { 770 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; 771 772#ifndef OPENSSL_NO_SCTP 773 /* Change to new shared key of SCTP-Auth, 774 * will be ignored if no SCTP used. 775 */ 776 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 777#endif 778 } 779 else 780 { 781 s->s3->tmp.next_state=SSL_ST_OK; 782#ifndef OPENSSL_NO_SCTP 783 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 784 { 785 s->d1->next_state = s->s3->tmp.next_state; 786 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 787 } 788#endif 789 } 790 s->init_num=0; 791 break; 792 793 case SSL_ST_OK: 794 /* clean a few things up */ 795 ssl3_cleanup_key_block(s); 796 797#if 0 798 BUF_MEM_free(s->init_buf); 799 s->init_buf=NULL; 800#endif 801 802 /* remove buffering on output */ 803 ssl_free_wbio_buffer(s); 804 805 s->init_num=0; 806 807 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */ 808 { 809 s->renegotiate=0; 810 s->new_session=0; 811 812 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 813 814 s->ctx->stats.sess_accept_good++; 815 /* s->server=1; */ 816 s->handshake_func=dtls1_accept; 817 818 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 819 } 820 821 ret = 1; 822 823 /* done handshaking, next message is client hello */ 824 s->d1->handshake_read_seq = 0; 825 /* next message is server hello */ 826 s->d1->handshake_write_seq = 0; 827 s->d1->next_handshake_write_seq = 0; 828 goto end; 829 /* break; */ 830 831 default: 832 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); 833 ret= -1; 834 goto end; 835 /* break; */ 836 } 837 838 if (!s->s3->tmp.reuse_message && !skip) 839 { 840 if (s->debug) 841 { 842 if ((ret=BIO_flush(s->wbio)) <= 0) 843 goto end; 844 } 845 846 847 if ((cb != NULL) && (s->state != state)) 848 { 849 new_state=s->state; 850 s->state=state; 851 cb(s,SSL_CB_ACCEPT_LOOP,1); 852 s->state=new_state; 853 } 854 } 855 skip=0; 856 } 857end: 858 /* BIO_flush(s->wbio); */ 859 860 s->in_handshake--; 861#ifndef OPENSSL_NO_SCTP 862 /* Notify SCTP BIO socket to leave handshake 863 * mode and prevent stream identifier other 864 * than 0. Will be ignored if no SCTP is used. 865 */ 866 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 867#endif 868 869 if (cb != NULL) 870 cb(s,SSL_CB_ACCEPT_EXIT,ret); 871 return(ret); 872 } 873 874int dtls1_send_hello_request(SSL *s) 875 { 876 unsigned char *p; 877 878 if (s->state == SSL3_ST_SW_HELLO_REQ_A) 879 { 880 p=(unsigned char *)s->init_buf->data; 881 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 882 883 s->state=SSL3_ST_SW_HELLO_REQ_B; 884 /* number of bytes to write */ 885 s->init_num=DTLS1_HM_HEADER_LENGTH; 886 s->init_off=0; 887 888 /* no need to buffer this message, since there are no retransmit 889 * requests for it */ 890 } 891 892 /* SSL3_ST_SW_HELLO_REQ_B */ 893 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 894 } 895 896int dtls1_send_hello_verify_request(SSL *s) 897 { 898 unsigned int msg_len; 899 unsigned char *msg, *buf, *p; 900 901 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) 902 { 903 buf = (unsigned char *)s->init_buf->data; 904 905 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 906 *(p++) = s->version >> 8; 907 *(p++) = s->version & 0xFF; 908 909 if (s->ctx->app_gen_cookie_cb == NULL || 910 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 911 &(s->d1->cookie_len)) == 0) 912 { 913 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); 914 return 0; 915 } 916 917 *(p++) = (unsigned char) s->d1->cookie_len; 918 memcpy(p, s->d1->cookie, s->d1->cookie_len); 919 p += s->d1->cookie_len; 920 msg_len = p - msg; 921 922 dtls1_set_message_header(s, buf, 923 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); 924 925 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 926 /* number of bytes to write */ 927 s->init_num=p-buf; 928 s->init_off=0; 929 } 930 931 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 932 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 933 } 934 935int dtls1_send_server_hello(SSL *s) 936 { 937 unsigned char *buf; 938 unsigned char *p,*d; 939 int i; 940 unsigned int sl; 941 unsigned long l; 942 943 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) 944 { 945 buf=(unsigned char *)s->init_buf->data; 946 p=s->s3->server_random; 947 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE); 948 /* Do the message type and length last */ 949 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 950 951 *(p++)=s->version>>8; 952 *(p++)=s->version&0xff; 953 954 /* Random stuff */ 955 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 956 p+=SSL3_RANDOM_SIZE; 957 958 /* now in theory we have 3 options to sending back the 959 * session id. If it is a re-use, we send back the 960 * old session-id, if it is a new session, we send 961 * back the new session-id or we send back a 0 length 962 * session-id if we want it to be single use. 963 * Currently I will not implement the '0' length session-id 964 * 12-Jan-98 - I'll now support the '0' length stuff. 965 */ 966 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 967 s->session->session_id_length=0; 968 969 sl=s->session->session_id_length; 970 if (sl > sizeof s->session->session_id) 971 { 972 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 973 return -1; 974 } 975 *(p++)=sl; 976 memcpy(p,s->session->session_id,sl); 977 p+=sl; 978 979 /* put the cipher */ 980 if (s->s3->tmp.new_cipher == NULL) 981 return -1; 982 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); 983 p+=i; 984 985 /* put the compression method */ 986#ifdef OPENSSL_NO_COMP 987 *(p++)=0; 988#else 989 if (s->s3->tmp.new_compression == NULL) 990 *(p++)=0; 991 else 992 *(p++)=s->s3->tmp.new_compression->id; 993#endif 994 995#ifndef OPENSSL_NO_TLSEXT 996 if (ssl_prepare_serverhello_tlsext(s) <= 0) 997 { 998 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT); 999 return -1; 1000 } 1001 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 1002 { 1003 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR); 1004 return -1; 1005 } 1006#endif 1007 1008 /* do the header */ 1009 l=(p-d); 1010 d=buf; 1011 1012 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 1013 1014 s->state=SSL3_ST_SW_SRVR_HELLO_B; 1015 /* number of bytes to write */ 1016 s->init_num=p-buf; 1017 s->init_off=0; 1018 1019 /* buffer the message to handle re-xmits */ 1020 dtls1_buffer_message(s, 0); 1021 } 1022 1023 /* SSL3_ST_SW_SRVR_HELLO_B */ 1024 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1025 } 1026 1027int dtls1_send_server_done(SSL *s) 1028 { 1029 unsigned char *p; 1030 1031 if (s->state == SSL3_ST_SW_SRVR_DONE_A) 1032 { 1033 p=(unsigned char *)s->init_buf->data; 1034 1035 /* do the header */ 1036 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 1037 1038 s->state=SSL3_ST_SW_SRVR_DONE_B; 1039 /* number of bytes to write */ 1040 s->init_num=DTLS1_HM_HEADER_LENGTH; 1041 s->init_off=0; 1042 1043 /* buffer the message to handle re-xmits */ 1044 dtls1_buffer_message(s, 0); 1045 } 1046 1047 /* SSL3_ST_SW_SRVR_DONE_B */ 1048 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1049 } 1050 1051int dtls1_send_server_key_exchange(SSL *s) 1052 { 1053#ifndef OPENSSL_NO_RSA 1054 unsigned char *q; 1055 int j,num; 1056 RSA *rsa; 1057 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1058 unsigned int u; 1059#endif 1060#ifndef OPENSSL_NO_DH 1061 DH *dh=NULL,*dhp; 1062#endif 1063#ifndef OPENSSL_NO_ECDH 1064 EC_KEY *ecdh=NULL, *ecdhp; 1065 unsigned char *encodedPoint = NULL; 1066 int encodedlen = 0; 1067 int curve_id = 0; 1068 BN_CTX *bn_ctx = NULL; 1069#endif 1070 EVP_PKEY *pkey; 1071 unsigned char *p,*d; 1072 int al,i; 1073 unsigned long type; 1074 int n; 1075 CERT *cert; 1076 BIGNUM *r[4]; 1077 int nr[4],kn; 1078 BUF_MEM *buf; 1079 EVP_MD_CTX md_ctx; 1080 1081 EVP_MD_CTX_init(&md_ctx); 1082 if (s->state == SSL3_ST_SW_KEY_EXCH_A) 1083 { 1084 type=s->s3->tmp.new_cipher->algorithm_mkey; 1085 cert=s->cert; 1086 1087 buf=s->init_buf; 1088 1089 r[0]=r[1]=r[2]=r[3]=NULL; 1090 n=0; 1091#ifndef OPENSSL_NO_RSA 1092 if (type & SSL_kRSA) 1093 { 1094 rsa=cert->rsa_tmp; 1095 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) 1096 { 1097 rsa=s->cert->rsa_tmp_cb(s, 1098 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1099 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1100 if(rsa == NULL) 1101 { 1102 al=SSL_AD_HANDSHAKE_FAILURE; 1103 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 1104 goto f_err; 1105 } 1106 RSA_up_ref(rsa); 1107 cert->rsa_tmp=rsa; 1108 } 1109 if (rsa == NULL) 1110 { 1111 al=SSL_AD_HANDSHAKE_FAILURE; 1112 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); 1113 goto f_err; 1114 } 1115 r[0]=rsa->n; 1116 r[1]=rsa->e; 1117 s->s3->tmp.use_rsa_tmp=1; 1118 } 1119 else 1120#endif 1121#ifndef OPENSSL_NO_DH 1122 if (type & SSL_kEDH) 1123 { 1124 dhp=cert->dh_tmp; 1125 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 1126 dhp=s->cert->dh_tmp_cb(s, 1127 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1128 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1129 if (dhp == NULL) 1130 { 1131 al=SSL_AD_HANDSHAKE_FAILURE; 1132 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 1133 goto f_err; 1134 } 1135 1136 if (s->s3->tmp.dh != NULL) 1137 { 1138 DH_free(dh); 1139 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1140 goto err; 1141 } 1142 1143 if ((dh=DHparams_dup(dhp)) == NULL) 1144 { 1145 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1146 goto err; 1147 } 1148 1149 s->s3->tmp.dh=dh; 1150 if ((dhp->pub_key == NULL || 1151 dhp->priv_key == NULL || 1152 (s->options & SSL_OP_SINGLE_DH_USE))) 1153 { 1154 if(!DH_generate_key(dh)) 1155 { 1156 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1157 ERR_R_DH_LIB); 1158 goto err; 1159 } 1160 } 1161 else 1162 { 1163 dh->pub_key=BN_dup(dhp->pub_key); 1164 dh->priv_key=BN_dup(dhp->priv_key); 1165 if ((dh->pub_key == NULL) || 1166 (dh->priv_key == NULL)) 1167 { 1168 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1169 goto err; 1170 } 1171 } 1172 r[0]=dh->p; 1173 r[1]=dh->g; 1174 r[2]=dh->pub_key; 1175 } 1176 else 1177#endif 1178#ifndef OPENSSL_NO_ECDH 1179 if (type & SSL_kEECDH) 1180 { 1181 const EC_GROUP *group; 1182 1183 ecdhp=cert->ecdh_tmp; 1184 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) 1185 { 1186 ecdhp=s->cert->ecdh_tmp_cb(s, 1187 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1188 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1189 } 1190 if (ecdhp == NULL) 1191 { 1192 al=SSL_AD_HANDSHAKE_FAILURE; 1193 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY); 1194 goto f_err; 1195 } 1196 1197 if (s->s3->tmp.ecdh != NULL) 1198 { 1199 EC_KEY_free(s->s3->tmp.ecdh); 1200 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1201 goto err; 1202 } 1203 1204 /* Duplicate the ECDH structure. */ 1205 if (ecdhp == NULL) 1206 { 1207 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1208 goto err; 1209 } 1210 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) 1211 { 1212 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1213 goto err; 1214 } 1215 1216 s->s3->tmp.ecdh=ecdh; 1217 if ((EC_KEY_get0_public_key(ecdh) == NULL) || 1218 (EC_KEY_get0_private_key(ecdh) == NULL) || 1219 (s->options & SSL_OP_SINGLE_ECDH_USE)) 1220 { 1221 if(!EC_KEY_generate_key(ecdh)) 1222 { 1223 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1224 goto err; 1225 } 1226 } 1227 1228 if (((group = EC_KEY_get0_group(ecdh)) == NULL) || 1229 (EC_KEY_get0_public_key(ecdh) == NULL) || 1230 (EC_KEY_get0_private_key(ecdh) == NULL)) 1231 { 1232 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1233 goto err; 1234 } 1235 1236 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1237 (EC_GROUP_get_degree(group) > 163)) 1238 { 1239 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1240 goto err; 1241 } 1242 1243 /* XXX: For now, we only support ephemeral ECDH 1244 * keys over named (not generic) curves. For 1245 * supported named curves, curve_id is non-zero. 1246 */ 1247 if ((curve_id = 1248 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) 1249 == 0) 1250 { 1251 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1252 goto err; 1253 } 1254 1255 /* Encode the public key. 1256 * First check the size of encoding and 1257 * allocate memory accordingly. 1258 */ 1259 encodedlen = EC_POINT_point2oct(group, 1260 EC_KEY_get0_public_key(ecdh), 1261 POINT_CONVERSION_UNCOMPRESSED, 1262 NULL, 0, NULL); 1263 1264 encodedPoint = (unsigned char *) 1265 OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 1266 bn_ctx = BN_CTX_new(); 1267 if ((encodedPoint == NULL) || (bn_ctx == NULL)) 1268 { 1269 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1270 goto err; 1271 } 1272 1273 1274 encodedlen = EC_POINT_point2oct(group, 1275 EC_KEY_get0_public_key(ecdh), 1276 POINT_CONVERSION_UNCOMPRESSED, 1277 encodedPoint, encodedlen, bn_ctx); 1278 1279 if (encodedlen == 0) 1280 { 1281 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1282 goto err; 1283 } 1284 1285 BN_CTX_free(bn_ctx); bn_ctx=NULL; 1286 1287 /* XXX: For now, we only support named (not 1288 * generic) curves in ECDH ephemeral key exchanges. 1289 * In this situation, we need four additional bytes 1290 * to encode the entire ServerECDHParams 1291 * structure. 1292 */ 1293 n = 4 + encodedlen; 1294 1295 /* We'll generate the serverKeyExchange message 1296 * explicitly so we can set these to NULLs 1297 */ 1298 r[0]=NULL; 1299 r[1]=NULL; 1300 r[2]=NULL; 1301 r[3]=NULL; 1302 } 1303 else 1304#endif /* !OPENSSL_NO_ECDH */ 1305#ifndef OPENSSL_NO_PSK 1306 if (type & SSL_kPSK) 1307 { 1308 /* reserve size for record length and PSK identity hint*/ 1309 n+=2+strlen(s->ctx->psk_identity_hint); 1310 } 1311 else 1312#endif /* !OPENSSL_NO_PSK */ 1313 { 1314 al=SSL_AD_HANDSHAKE_FAILURE; 1315 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1316 goto f_err; 1317 } 1318 for (i=0; r[i] != NULL; i++) 1319 { 1320 nr[i]=BN_num_bytes(r[i]); 1321 n+=2+nr[i]; 1322 } 1323 1324 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 1325 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 1326 { 1327 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL)) 1328 == NULL) 1329 { 1330 al=SSL_AD_DECODE_ERROR; 1331 goto f_err; 1332 } 1333 kn=EVP_PKEY_size(pkey); 1334 } 1335 else 1336 { 1337 pkey=NULL; 1338 kn=0; 1339 } 1340 1341 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) 1342 { 1343 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); 1344 goto err; 1345 } 1346 d=(unsigned char *)s->init_buf->data; 1347 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1348 1349 for (i=0; r[i] != NULL; i++) 1350 { 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. 1360 * In this situation, the serverKeyExchange message has: 1361 * [1 byte CurveType], [2 byte CurveName] 1362 * [1 byte length of encoded point], followed by 1363 * the actual encoded point itself 1364 */ 1365 *p = NAMED_CURVE_TYPE; 1366 p += 1; 1367 *p = 0; 1368 p += 1; 1369 *p = curve_id; 1370 p += 1; 1371 *p = encodedlen; 1372 p += 1; 1373 memcpy((unsigned char*)p, 1374 (unsigned char *)encodedPoint, 1375 encodedlen); 1376 OPENSSL_free(encodedPoint); 1377 encodedPoint = NULL; 1378 p += encodedlen; 1379 } 1380#endif 1381 1382#ifndef OPENSSL_NO_PSK 1383 if (type & SSL_kPSK) 1384 { 1385 /* copy PSK identity hint */ 1386 s2n(strlen(s->ctx->psk_identity_hint), p); 1387 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint)); 1388 p+=strlen(s->ctx->psk_identity_hint); 1389 } 1390#endif 1391 1392 /* not anonymous */ 1393 if (pkey != NULL) 1394 { 1395 /* n is the length of the params, they start at 1396 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space 1397 * at the end. */ 1398#ifndef OPENSSL_NO_RSA 1399 if (pkey->type == EVP_PKEY_RSA) 1400 { 1401 q=md_buf; 1402 j=0; 1403 for (num=2; num > 0; num--) 1404 { 1405 EVP_DigestInit_ex(&md_ctx,(num == 2) 1406 ?s->ctx->md5:s->ctx->sha1, NULL); 1407 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1408 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1409 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1410 EVP_DigestFinal_ex(&md_ctx,q, 1411 (unsigned int *)&i); 1412 q+=i; 1413 j+=i; 1414 } 1415 if (RSA_sign(NID_md5_sha1, md_buf, j, 1416 &(p[2]), &u, pkey->pkey.rsa) <= 0) 1417 { 1418 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); 1419 goto err; 1420 } 1421 s2n(u,p); 1422 n+=u+2; 1423 } 1424 else 1425#endif 1426#if !defined(OPENSSL_NO_DSA) 1427 if (pkey->type == EVP_PKEY_DSA) 1428 { 1429 /* lets do DSS */ 1430 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); 1431 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1432 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1433 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1434 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1435 (unsigned int *)&i,pkey)) 1436 { 1437 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); 1438 goto err; 1439 } 1440 s2n(i,p); 1441 n+=i+2; 1442 } 1443 else 1444#endif 1445#if !defined(OPENSSL_NO_ECDSA) 1446 if (pkey->type == EVP_PKEY_EC) 1447 { 1448 /* let's do ECDSA */ 1449 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL); 1450 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1451 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),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 { 1456 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA); 1457 goto err; 1458 } 1459 s2n(i,p); 1460 n+=i+2; 1461 } 1462 else 1463#endif 1464 { 1465 /* Is this error check actually needed? */ 1466 al=SSL_AD_HANDSHAKE_FAILURE; 1467 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); 1468 goto f_err; 1469 } 1470 } 1471 1472 d = dtls1_set_message_header(s, d, 1473 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1474 1475 /* we should now have things packed up, so lets send 1476 * it off */ 1477 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1478 s->init_off=0; 1479 1480 /* buffer the message to handle re-xmits */ 1481 dtls1_buffer_message(s, 0); 1482 } 1483 1484 s->state = SSL3_ST_SW_KEY_EXCH_B; 1485 EVP_MD_CTX_cleanup(&md_ctx); 1486 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1487f_err: 1488 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1489err: 1490#ifndef OPENSSL_NO_ECDH 1491 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1492 BN_CTX_free(bn_ctx); 1493#endif 1494 EVP_MD_CTX_cleanup(&md_ctx); 1495 return(-1); 1496 } 1497 1498int dtls1_send_certificate_request(SSL *s) 1499 { 1500 unsigned char *p,*d; 1501 int i,j,nl,off,n; 1502 STACK_OF(X509_NAME) *sk=NULL; 1503 X509_NAME *name; 1504 BUF_MEM *buf; 1505 unsigned int msg_len; 1506 1507 if (s->state == SSL3_ST_SW_CERT_REQ_A) 1508 { 1509 buf=s->init_buf; 1510 1511 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1512 1513 /* get the list of acceptable cert types */ 1514 p++; 1515 n=ssl3_get_req_cert_type(s,p); 1516 d[0]=n; 1517 p+=n; 1518 n++; 1519 1520 off=n; 1521 p+=2; 1522 n+=2; 1523 1524 sk=SSL_get_client_CA_list(s); 1525 nl=0; 1526 if (sk != NULL) 1527 { 1528 for (i=0; i<sk_X509_NAME_num(sk); i++) 1529 { 1530 name=sk_X509_NAME_value(sk,i); 1531 j=i2d_X509_NAME(name,NULL); 1532 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2)) 1533 { 1534 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); 1535 goto err; 1536 } 1537 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]); 1538 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 1539 { 1540 s2n(j,p); 1541 i2d_X509_NAME(name,&p); 1542 n+=2+j; 1543 nl+=2+j; 1544 } 1545 else 1546 { 1547 d=p; 1548 i2d_X509_NAME(name,&p); 1549 j-=2; s2n(j,d); j+=2; 1550 n+=j; 1551 nl+=j; 1552 } 1553 } 1554 } 1555 /* else no CA names */ 1556 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); 1557 s2n(nl,p); 1558 1559 d=(unsigned char *)buf->data; 1560 *(d++)=SSL3_MT_CERTIFICATE_REQUEST; 1561 l2n3(n,d); 1562 s2n(s->d1->handshake_write_seq,d); 1563 s->d1->handshake_write_seq++; 1564 1565 /* we should now have things packed up, so lets send 1566 * it off */ 1567 1568 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1569 s->init_off=0; 1570#ifdef NETSCAPE_HANG_BUG 1571/* XXX: what to do about this? */ 1572 p=(unsigned char *)s->init_buf->data + s->init_num; 1573 1574 /* do the header */ 1575 *(p++)=SSL3_MT_SERVER_DONE; 1576 *(p++)=0; 1577 *(p++)=0; 1578 *(p++)=0; 1579 s->init_num += 4; 1580#endif 1581 1582 /* XDTLS: set message header ? */ 1583 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1584 dtls1_set_message_header(s, (void *)s->init_buf->data, 1585 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); 1586 1587 /* buffer the message to handle re-xmits */ 1588 dtls1_buffer_message(s, 0); 1589 1590 s->state = SSL3_ST_SW_CERT_REQ_B; 1591 } 1592 1593 /* SSL3_ST_SW_CERT_REQ_B */ 1594 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1595err: 1596 return(-1); 1597 } 1598 1599int dtls1_send_server_certificate(SSL *s) 1600 { 1601 unsigned long l; 1602 X509 *x; 1603 1604 if (s->state == SSL3_ST_SW_CERT_A) 1605 { 1606 x=ssl_get_server_send_cert(s); 1607 if (x == NULL) 1608 { 1609 /* VRS: allow null cert if auth == KRB5 */ 1610 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || 1611 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) 1612 { 1613 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1614 return(0); 1615 } 1616 } 1617 1618 l=dtls1_output_cert_chain(s,x); 1619 if (!l) 1620 { 1621 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1622 return(0); 1623 } 1624 s->state=SSL3_ST_SW_CERT_B; 1625 s->init_num=(int)l; 1626 s->init_off=0; 1627 1628 /* buffer the message to handle re-xmits */ 1629 dtls1_buffer_message(s, 0); 1630 } 1631 1632 /* SSL3_ST_SW_CERT_B */ 1633 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1634 } 1635 1636#ifndef OPENSSL_NO_TLSEXT 1637int dtls1_send_newsession_ticket(SSL *s) 1638 { 1639 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) 1640 { 1641 unsigned char *p, *senc, *macstart; 1642 int len, slen; 1643 unsigned int hlen, msg_len; 1644 EVP_CIPHER_CTX ctx; 1645 HMAC_CTX hctx; 1646 SSL_CTX *tctx = s->initial_ctx; 1647 unsigned char iv[EVP_MAX_IV_LENGTH]; 1648 unsigned char key_name[16]; 1649 1650 /* get session encoding length */ 1651 slen = i2d_SSL_SESSION(s->session, NULL); 1652 /* Some length values are 16 bits, so forget it if session is 1653 * too long 1654 */ 1655 if (slen > 0xFF00) 1656 return -1; 1657 /* Grow buffer if need be: the length calculation is as 1658 * follows 12 (DTLS handshake message header) + 1659 * 4 (ticket lifetime hint) + 2 (ticket length) + 1660 * 16 (key name) + max_iv_len (iv length) + 1661 * session_length + max_enc_block_size (max encrypted session 1662 * length) + max_md_size (HMAC). 1663 */ 1664 if (!BUF_MEM_grow(s->init_buf, 1665 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1666 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1667 return -1; 1668 senc = OPENSSL_malloc(slen); 1669 if (!senc) 1670 return -1; 1671 p = senc; 1672 i2d_SSL_SESSION(s->session, &p); 1673 1674 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1675 EVP_CIPHER_CTX_init(&ctx); 1676 HMAC_CTX_init(&hctx); 1677 /* Initialize HMAC and cipher contexts. If callback present 1678 * it does all the work otherwise use generated values 1679 * from parent ctx. 1680 */ 1681 if (tctx->tlsext_ticket_key_cb) 1682 { 1683 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1684 &hctx, 1) < 0) 1685 { 1686 OPENSSL_free(senc); 1687 return -1; 1688 } 1689 } 1690 else 1691 { 1692 RAND_pseudo_bytes(iv, 16); 1693 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1694 tctx->tlsext_tick_aes_key, iv); 1695 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1696 tlsext_tick_md(), NULL); 1697 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1698 } 1699 l2n(s->session->tlsext_tick_lifetime_hint, p); 1700 /* Skip ticket length for now */ 1701 p += 2; 1702 /* Output key name */ 1703 macstart = p; 1704 memcpy(p, key_name, 16); 1705 p += 16; 1706 /* output IV */ 1707 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1708 p += EVP_CIPHER_CTX_iv_length(&ctx); 1709 /* Encrypt session data */ 1710 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1711 p += len; 1712 EVP_EncryptFinal(&ctx, p, &len); 1713 p += len; 1714 EVP_CIPHER_CTX_cleanup(&ctx); 1715 1716 HMAC_Update(&hctx, macstart, p - macstart); 1717 HMAC_Final(&hctx, p, &hlen); 1718 HMAC_CTX_cleanup(&hctx); 1719 1720 p += hlen; 1721 /* Now write out lengths: p points to end of data written */ 1722 /* Total length */ 1723 len = p - (unsigned char *)(s->init_buf->data); 1724 /* Ticket length */ 1725 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1726 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1727 1728 /* number of bytes to write */ 1729 s->init_num= len; 1730 s->state=SSL3_ST_SW_SESSION_TICKET_B; 1731 s->init_off=0; 1732 OPENSSL_free(senc); 1733 1734 /* XDTLS: set message header ? */ 1735 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1736 dtls1_set_message_header(s, (void *)s->init_buf->data, 1737 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len); 1738 1739 /* buffer the message to handle re-xmits */ 1740 dtls1_buffer_message(s, 0); 1741 } 1742 1743 /* SSL3_ST_SW_SESSION_TICKET_B */ 1744 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1745 } 1746#endif 1747