1 /* ssl/d1_srvr.c */ 2 /* 3 * DTLS implementation written by Nagendra Modadugu 4 * (nagendra (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 56 * Hudson (tjh (at) cryptsoft.com). 57 * 58 */ 59 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 60 * All rights reserved. 61 * 62 * This package is an SSL implementation written 63 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 128 129 static const SSL_METHOD *dtls1_get_server_method(int ver); 130 static int dtls1_send_hello_verify_request(SSL *s); 131 132 static 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 } 139 140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method, 141 dtls1_accept, 142 ssl_undefined_function, 143 dtls1_get_server_method) 144 145 int 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 ret= -1; 237 goto end; 238 } 239 s->init_buf=buf; 240 } 241 242 if (!ssl3_setup_buffers(s)) 243 { 244 ret= -1; 245 goto end; 246 } 247 248 s->init_num=0; 249 250 if (s->state != SSL_ST_RENEGOTIATE) 251 { 252 /* Ok, we now need to push on a buffering BIO so that 253 * the output is sent in a way that TCP likes :-) 254 * ...but not with SCTP :-) 255 */ 256 #ifndef OPENSSL_NO_SCTP 257 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) 258 #endif 259 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; } 260 261 ssl3_init_finished_mac(s); 262 s->state=SSL3_ST_SR_CLNT_HELLO_A; 263 s->ctx->stats.sess_accept++; 264 } 265 else 266 { 267 /* s->state == SSL_ST_RENEGOTIATE, 268 * we will just send a HelloRequest */ 269 s->ctx->stats.sess_accept_renegotiate++; 270 s->state=SSL3_ST_SW_HELLO_REQ_A; 271 } 272 273 break; 274 275 case SSL3_ST_SW_HELLO_REQ_A: 276 case SSL3_ST_SW_HELLO_REQ_B: 277 278 s->shutdown=0; 279 dtls1_clear_record_buffer(s); 280 dtls1_start_timer(s); 281 ret=dtls1_send_hello_request(s); 282 if (ret <= 0) goto end; 283 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 284 s->state=SSL3_ST_SW_FLUSH; 285 s->init_num=0; 286 287 ssl3_init_finished_mac(s); 288 break; 289 290 case SSL3_ST_SW_HELLO_REQ_C: 291 s->state=SSL_ST_OK; 292 break; 293 294 case SSL3_ST_SR_CLNT_HELLO_A: 295 case SSL3_ST_SR_CLNT_HELLO_B: 296 case SSL3_ST_SR_CLNT_HELLO_C: 297 298 s->shutdown=0; 299 ret=ssl3_get_client_hello(s); 300 if (ret <= 0) goto end; 301 dtls1_stop_timer(s); 302 303 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)) 304 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A; 305 else 306 s->state = SSL3_ST_SW_SRVR_HELLO_A; 307 308 s->init_num=0; 309 310 /* Reflect ClientHello sequence to remain stateless while listening */ 311 if (listen) 312 { 313 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence)); 314 } 315 316 /* If we're just listening, stop here */ 317 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A) 318 { 319 ret = 2; 320 s->d1->listen = 0; 321 /* Set expected sequence numbers 322 * to continue the handshake. 323 */ 324 s->d1->handshake_read_seq = 2; 325 s->d1->handshake_write_seq = 1; 326 s->d1->next_handshake_write_seq = 1; 327 goto end; 328 } 329 330 break; 331 332 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A: 333 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B: 334 335 ret = dtls1_send_hello_verify_request(s); 336 if ( ret <= 0) goto end; 337 s->state=SSL3_ST_SW_FLUSH; 338 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A; 339 340 /* HelloVerifyRequest resets Finished MAC */ 341 if (s->version != DTLS1_BAD_VER) 342 ssl3_init_finished_mac(s); 343 break; 344 345 #ifndef OPENSSL_NO_SCTP 346 case DTLS1_SCTP_ST_SR_READ_SOCK: 347 348 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) 349 { 350 s->s3->in_read_app_data=2; 351 s->rwstate=SSL_READING; 352 BIO_clear_retry_flags(SSL_get_rbio(s)); 353 BIO_set_retry_read(SSL_get_rbio(s)); 354 ret = -1; 355 goto end; 356 } 357 358 s->state=SSL3_ST_SR_FINISHED_A; 359 break; 360 361 case DTLS1_SCTP_ST_SW_WRITE_SOCK: 362 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s)); 363 if (ret < 0) goto end; 364 365 if (ret == 0) 366 { 367 if (s->d1->next_state != SSL_ST_OK) 368 { 369 s->s3->in_read_app_data=2; 370 s->rwstate=SSL_READING; 371 BIO_clear_retry_flags(SSL_get_rbio(s)); 372 BIO_set_retry_read(SSL_get_rbio(s)); 373 ret = -1; 374 goto end; 375 } 376 } 377 378 s->state=s->d1->next_state; 379 break; 380 #endif 381 382 case SSL3_ST_SW_SRVR_HELLO_A: 383 case SSL3_ST_SW_SRVR_HELLO_B: 384 s->renegotiate = 2; 385 dtls1_start_timer(s); 386 ret=dtls1_send_server_hello(s); 387 if (ret <= 0) goto end; 388 389 if (s->hit) 390 { 391 #ifndef OPENSSL_NO_SCTP 392 /* Add new shared key for SCTP-Auth, 393 * will be ignored if no SCTP used. 394 */ 395 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 396 DTLS1_SCTP_AUTH_LABEL); 397 398 SSL_export_keying_material(s, sctpauthkey, 399 sizeof(sctpauthkey), labelbuffer, 400 sizeof(labelbuffer), NULL, 0, 0); 401 402 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 403 sizeof(sctpauthkey), sctpauthkey); 404 #endif 405 #ifndef OPENSSL_NO_TLSEXT 406 if (s->tlsext_ticket_expected) 407 s->state=SSL3_ST_SW_SESSION_TICKET_A; 408 else 409 s->state=SSL3_ST_SW_CHANGE_A; 410 #else 411 s->state=SSL3_ST_SW_CHANGE_A; 412 #endif 413 } 414 else 415 s->state=SSL3_ST_SW_CERT_A; 416 s->init_num=0; 417 break; 418 419 case SSL3_ST_SW_CERT_A: 420 case SSL3_ST_SW_CERT_B: 421 /* Check if it is anon DH or normal PSK */ 422 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 423 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 424 { 425 dtls1_start_timer(s); 426 ret=dtls1_send_server_certificate(s); 427 if (ret <= 0) goto end; 428 #ifndef OPENSSL_NO_TLSEXT 429 if (s->tlsext_status_expected) 430 s->state=SSL3_ST_SW_CERT_STATUS_A; 431 else 432 s->state=SSL3_ST_SW_KEY_EXCH_A; 433 } 434 else 435 { 436 skip = 1; 437 s->state=SSL3_ST_SW_KEY_EXCH_A; 438 } 439 #else 440 } 441 else 442 skip=1; 443 444 s->state=SSL3_ST_SW_KEY_EXCH_A; 445 #endif 446 s->init_num=0; 447 break; 448 449 case SSL3_ST_SW_KEY_EXCH_A: 450 case SSL3_ST_SW_KEY_EXCH_B: 451 alg_k = s->s3->tmp.new_cipher->algorithm_mkey; 452 453 /* clear this, it may get reset by 454 * send_server_key_exchange */ 455 if ((s->options & SSL_OP_EPHEMERAL_RSA) 456 #ifndef OPENSSL_NO_KRB5 457 && !(alg_k & SSL_kKRB5) 458 #endif /* OPENSSL_NO_KRB5 */ 459 ) 460 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key 461 * even when forbidden by protocol specs 462 * (handshake may fail as clients are not required to 463 * be able to handle this) */ 464 s->s3->tmp.use_rsa_tmp=1; 465 else 466 s->s3->tmp.use_rsa_tmp=0; 467 468 /* only send if a DH key exchange or 469 * RSA but we have a sign only certificate */ 470 if (s->s3->tmp.use_rsa_tmp 471 /* PSK: send ServerKeyExchange if PSK identity 472 * hint if provided */ 473 #ifndef OPENSSL_NO_PSK 474 || ((alg_k & SSL_kPSK) && s->session->psk_identity_hint) 475 #endif 476 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd)) 477 || (alg_k & SSL_kEECDH) 478 || ((alg_k & SSL_kRSA) 479 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL 480 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) 481 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher) 482 ) 483 ) 484 ) 485 ) 486 { 487 dtls1_start_timer(s); 488 ret=dtls1_send_server_key_exchange(s); 489 if (ret <= 0) goto end; 490 } 491 else 492 skip=1; 493 494 s->state=SSL3_ST_SW_CERT_REQ_A; 495 s->init_num=0; 496 break; 497 498 case SSL3_ST_SW_CERT_REQ_A: 499 case SSL3_ST_SW_CERT_REQ_B: 500 if (/* don't request cert unless asked for it: */ 501 !(s->verify_mode & SSL_VERIFY_PEER) || 502 /* if SSL_VERIFY_CLIENT_ONCE is set, 503 * don't request cert during re-negotiation: */ 504 ((s->session->peer != NULL) && 505 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) || 506 /* never request cert in anonymous ciphersuites 507 * (see section "Certificate request" in SSL 3 drafts 508 * and in RFC 2246): */ 509 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) && 510 /* ... except when the application insists on verification 511 * (against the specs, but s3_clnt.c accepts this for SSL 3) */ 512 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) || 513 /* never request cert in Kerberos ciphersuites */ 514 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) 515 /* With normal PSK Certificates and 516 * Certificate Requests are omitted */ 517 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 518 { 519 /* no cert request */ 520 skip=1; 521 s->s3->tmp.cert_request=0; 522 s->state=SSL3_ST_SW_SRVR_DONE_A; 523 #ifndef OPENSSL_NO_SCTP 524 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 525 { 526 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 527 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 528 } 529 #endif 530 } 531 else 532 { 533 s->s3->tmp.cert_request=1; 534 dtls1_start_timer(s); 535 ret=dtls1_send_certificate_request(s); 536 if (ret <= 0) goto end; 537 #ifndef NETSCAPE_HANG_BUG 538 s->state=SSL3_ST_SW_SRVR_DONE_A; 539 #ifndef OPENSSL_NO_SCTP 540 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 541 { 542 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A; 543 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK; 544 } 545 #endif 546 #else 547 s->state=SSL3_ST_SW_FLUSH; 548 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 549 #ifndef OPENSSL_NO_SCTP 550 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 551 { 552 s->d1->next_state = s->s3->tmp.next_state; 553 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 554 } 555 #endif 556 #endif 557 s->init_num=0; 558 } 559 break; 560 561 case SSL3_ST_SW_SRVR_DONE_A: 562 case SSL3_ST_SW_SRVR_DONE_B: 563 dtls1_start_timer(s); 564 ret=dtls1_send_server_done(s); 565 if (ret <= 0) goto end; 566 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A; 567 s->state=SSL3_ST_SW_FLUSH; 568 s->init_num=0; 569 break; 570 571 case SSL3_ST_SW_FLUSH: 572 s->rwstate=SSL_WRITING; 573 if (BIO_flush(s->wbio) <= 0) 574 { 575 /* If the write error was fatal, stop trying */ 576 if (!BIO_should_retry(s->wbio)) 577 { 578 s->rwstate=SSL_NOTHING; 579 s->state=s->s3->tmp.next_state; 580 } 581 582 ret= -1; 583 goto end; 584 } 585 s->rwstate=SSL_NOTHING; 586 s->state=s->s3->tmp.next_state; 587 break; 588 589 case SSL3_ST_SR_CERT_A: 590 case SSL3_ST_SR_CERT_B: 591 /* Check for second client hello (MS SGC) */ 592 ret = ssl3_check_client_hello(s); 593 if (ret <= 0) 594 goto end; 595 if (ret == 2) 596 { 597 dtls1_stop_timer(s); 598 s->state = SSL3_ST_SR_CLNT_HELLO_C; 599 } 600 else { 601 /* could be sent for a DH cert, even if we 602 * have not asked for it :-) */ 603 ret=ssl3_get_client_certificate(s); 604 if (ret <= 0) goto end; 605 s->init_num=0; 606 s->state=SSL3_ST_SR_KEY_EXCH_A; 607 } 608 break; 609 610 case SSL3_ST_SR_KEY_EXCH_A: 611 case SSL3_ST_SR_KEY_EXCH_B: 612 ret=ssl3_get_client_key_exchange(s); 613 if (ret <= 0) goto end; 614 #ifndef OPENSSL_NO_SCTP 615 /* Add new shared key for SCTP-Auth, 616 * will be ignored if no SCTP used. 617 */ 618 snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL), 619 DTLS1_SCTP_AUTH_LABEL); 620 621 SSL_export_keying_material(s, sctpauthkey, 622 sizeof(sctpauthkey), labelbuffer, 623 sizeof(labelbuffer), NULL, 0, 0); 624 625 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY, 626 sizeof(sctpauthkey), sctpauthkey); 627 #endif 628 629 s->state=SSL3_ST_SR_CERT_VRFY_A; 630 s->init_num=0; 631 632 if (ret == 2) 633 { 634 /* For the ECDH ciphersuites when 635 * the client sends its ECDH pub key in 636 * a certificate, the CertificateVerify 637 * message is not sent. 638 */ 639 s->state=SSL3_ST_SR_FINISHED_A; 640 s->init_num = 0; 641 } 642 else 643 { 644 s->state=SSL3_ST_SR_CERT_VRFY_A; 645 s->init_num=0; 646 647 /* We need to get hashes here so if there is 648 * a client cert, it can be verified */ 649 s->method->ssl3_enc->cert_verify_mac(s, 650 NID_md5, 651 &(s->s3->tmp.cert_verify_md[0])); 652 s->method->ssl3_enc->cert_verify_mac(s, 653 NID_sha1, 654 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH])); 655 } 656 break; 657 658 case SSL3_ST_SR_CERT_VRFY_A: 659 case SSL3_ST_SR_CERT_VRFY_B: 660 661 s->d1->change_cipher_spec_ok = 1; 662 /* we should decide if we expected this one */ 663 ret=ssl3_get_cert_verify(s); 664 if (ret <= 0) goto end; 665 #ifndef OPENSSL_NO_SCTP 666 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) && 667 state == SSL_ST_RENEGOTIATE) 668 s->state=DTLS1_SCTP_ST_SR_READ_SOCK; 669 else 670 #endif 671 s->state=SSL3_ST_SR_FINISHED_A; 672 s->init_num=0; 673 break; 674 675 case SSL3_ST_SR_FINISHED_A: 676 case SSL3_ST_SR_FINISHED_B: 677 s->d1->change_cipher_spec_ok = 1; 678 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A, 679 SSL3_ST_SR_FINISHED_B); 680 if (ret <= 0) goto end; 681 dtls1_stop_timer(s); 682 if (s->hit) 683 s->state=SSL_ST_OK; 684 #ifndef OPENSSL_NO_TLSEXT 685 else if (s->tlsext_ticket_expected) 686 s->state=SSL3_ST_SW_SESSION_TICKET_A; 687 #endif 688 else 689 s->state=SSL3_ST_SW_CHANGE_A; 690 s->init_num=0; 691 break; 692 693 #ifndef OPENSSL_NO_TLSEXT 694 case SSL3_ST_SW_SESSION_TICKET_A: 695 case SSL3_ST_SW_SESSION_TICKET_B: 696 ret=dtls1_send_newsession_ticket(s); 697 if (ret <= 0) goto end; 698 s->state=SSL3_ST_SW_CHANGE_A; 699 s->init_num=0; 700 break; 701 702 case SSL3_ST_SW_CERT_STATUS_A: 703 case SSL3_ST_SW_CERT_STATUS_B: 704 ret=ssl3_send_cert_status(s); 705 if (ret <= 0) goto end; 706 s->state=SSL3_ST_SW_KEY_EXCH_A; 707 s->init_num=0; 708 break; 709 710 #endif 711 712 case SSL3_ST_SW_CHANGE_A: 713 case SSL3_ST_SW_CHANGE_B: 714 715 s->session->cipher=s->s3->tmp.new_cipher; 716 if (!s->method->ssl3_enc->setup_key_block(s)) 717 { ret= -1; goto end; } 718 719 ret=dtls1_send_change_cipher_spec(s, 720 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B); 721 722 if (ret <= 0) goto end; 723 724 #ifndef OPENSSL_NO_SCTP 725 if (!s->hit) 726 { 727 /* Change to new shared key of SCTP-Auth, 728 * will be ignored if no SCTP used. 729 */ 730 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 731 } 732 #endif 733 734 s->state=SSL3_ST_SW_FINISHED_A; 735 s->init_num=0; 736 737 if (!s->method->ssl3_enc->change_cipher_state(s, 738 SSL3_CHANGE_CIPHER_SERVER_WRITE)) 739 { 740 ret= -1; 741 goto end; 742 } 743 744 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE); 745 break; 746 747 case SSL3_ST_SW_FINISHED_A: 748 case SSL3_ST_SW_FINISHED_B: 749 ret=dtls1_send_finished(s, 750 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B, 751 s->method->ssl3_enc->server_finished_label, 752 s->method->ssl3_enc->server_finished_label_len); 753 if (ret <= 0) goto end; 754 s->state=SSL3_ST_SW_FLUSH; 755 if (s->hit) 756 { 757 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A; 758 759 #ifndef OPENSSL_NO_SCTP 760 /* Change to new shared key of SCTP-Auth, 761 * will be ignored if no SCTP used. 762 */ 763 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL); 764 #endif 765 } 766 else 767 { 768 s->s3->tmp.next_state=SSL_ST_OK; 769 #ifndef OPENSSL_NO_SCTP 770 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) 771 { 772 s->d1->next_state = s->s3->tmp.next_state; 773 s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK; 774 } 775 #endif 776 } 777 s->init_num=0; 778 break; 779 780 case SSL_ST_OK: 781 /* clean a few things up */ 782 ssl3_cleanup_key_block(s); 783 784 #if 0 785 BUF_MEM_free(s->init_buf); 786 s->init_buf=NULL; 787 #endif 788 789 /* remove buffering on output */ 790 ssl_free_wbio_buffer(s); 791 792 s->init_num=0; 793 794 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */ 795 { 796 s->renegotiate=0; 797 s->new_session=0; 798 799 ssl_update_cache(s,SSL_SESS_CACHE_SERVER); 800 801 s->ctx->stats.sess_accept_good++; 802 /* s->server=1; */ 803 s->handshake_func=dtls1_accept; 804 805 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1); 806 } 807 808 ret = 1; 809 810 /* done handshaking, next message is client hello */ 811 s->d1->handshake_read_seq = 0; 812 /* next message is server hello */ 813 s->d1->handshake_write_seq = 0; 814 s->d1->next_handshake_write_seq = 0; 815 goto end; 816 /* break; */ 817 818 default: 819 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE); 820 ret= -1; 821 goto end; 822 /* break; */ 823 } 824 825 if (!s->s3->tmp.reuse_message && !skip) 826 { 827 if (s->debug) 828 { 829 if ((ret=BIO_flush(s->wbio)) <= 0) 830 goto end; 831 } 832 833 834 if ((cb != NULL) && (s->state != state)) 835 { 836 new_state=s->state; 837 s->state=state; 838 cb(s,SSL_CB_ACCEPT_LOOP,1); 839 s->state=new_state; 840 } 841 } 842 skip=0; 843 } 844 end: 845 /* BIO_flush(s->wbio); */ 846 847 s->in_handshake--; 848 #ifndef OPENSSL_NO_SCTP 849 /* Notify SCTP BIO socket to leave handshake 850 * mode and prevent stream identifier other 851 * than 0. Will be ignored if no SCTP is used. 852 */ 853 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL); 854 #endif 855 856 if (cb != NULL) 857 cb(s,SSL_CB_ACCEPT_EXIT,ret); 858 return(ret); 859 } 860 861 int dtls1_send_hello_request(SSL *s) 862 { 863 unsigned char *p; 864 865 if (s->state == SSL3_ST_SW_HELLO_REQ_A) 866 { 867 p=(unsigned char *)s->init_buf->data; 868 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0); 869 870 s->state=SSL3_ST_SW_HELLO_REQ_B; 871 /* number of bytes to write */ 872 s->init_num=DTLS1_HM_HEADER_LENGTH; 873 s->init_off=0; 874 875 /* no need to buffer this message, since there are no retransmit 876 * requests for it */ 877 } 878 879 /* SSL3_ST_SW_HELLO_REQ_B */ 880 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 881 } 882 883 int dtls1_send_hello_verify_request(SSL *s) 884 { 885 unsigned int msg_len; 886 unsigned char *msg, *buf, *p; 887 888 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) 889 { 890 buf = (unsigned char *)s->init_buf->data; 891 892 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]); 893 *(p++) = s->version >> 8; 894 *(p++) = s->version & 0xFF; 895 896 if (s->ctx->app_gen_cookie_cb == NULL || 897 s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 898 &(s->d1->cookie_len)) == 0) 899 { 900 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR); 901 return 0; 902 } 903 904 *(p++) = (unsigned char) s->d1->cookie_len; 905 memcpy(p, s->d1->cookie, s->d1->cookie_len); 906 p += s->d1->cookie_len; 907 msg_len = p - msg; 908 909 dtls1_set_message_header(s, buf, 910 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len); 911 912 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B; 913 /* number of bytes to write */ 914 s->init_num=p-buf; 915 s->init_off=0; 916 } 917 918 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */ 919 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 920 } 921 922 int dtls1_send_server_hello(SSL *s) 923 { 924 unsigned char *buf; 925 unsigned char *p,*d; 926 int i; 927 unsigned int sl; 928 unsigned long l; 929 930 if (s->state == SSL3_ST_SW_SRVR_HELLO_A) 931 { 932 buf=(unsigned char *)s->init_buf->data; 933 p=s->s3->server_random; 934 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE); 935 /* Do the message type and length last */ 936 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]); 937 938 *(p++)=s->version>>8; 939 *(p++)=s->version&0xff; 940 941 /* Random stuff */ 942 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE); 943 p+=SSL3_RANDOM_SIZE; 944 945 /* now in theory we have 3 options to sending back the 946 * session id. If it is a re-use, we send back the 947 * old session-id, if it is a new session, we send 948 * back the new session-id or we send back a 0 length 949 * session-id if we want it to be single use. 950 * Currently I will not implement the '0' length session-id 951 * 12-Jan-98 - I'll now support the '0' length stuff. 952 */ 953 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)) 954 s->session->session_id_length=0; 955 956 sl=s->session->session_id_length; 957 if (sl > sizeof s->session->session_id) 958 { 959 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); 960 return -1; 961 } 962 *(p++)=sl; 963 memcpy(p,s->session->session_id,sl); 964 p+=sl; 965 966 /* put the cipher */ 967 if (s->s3->tmp.new_cipher == NULL) 968 return -1; 969 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p); 970 p+=i; 971 972 /* put the compression method */ 973 #ifdef OPENSSL_NO_COMP 974 *(p++)=0; 975 #else 976 if (s->s3->tmp.new_compression == NULL) 977 *(p++)=0; 978 else 979 *(p++)=s->s3->tmp.new_compression->id; 980 #endif 981 982 #ifndef OPENSSL_NO_TLSEXT 983 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) 984 { 985 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR); 986 return -1; 987 } 988 #endif 989 990 /* do the header */ 991 l=(p-d); 992 d=buf; 993 994 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l); 995 996 s->state=SSL3_ST_SW_SRVR_HELLO_B; 997 /* number of bytes to write */ 998 s->init_num=p-buf; 999 s->init_off=0; 1000 1001 /* buffer the message to handle re-xmits */ 1002 dtls1_buffer_message(s, 0); 1003 } 1004 1005 /* SSL3_ST_SW_SRVR_HELLO_B */ 1006 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1007 } 1008 1009 int dtls1_send_server_done(SSL *s) 1010 { 1011 unsigned char *p; 1012 1013 if (s->state == SSL3_ST_SW_SRVR_DONE_A) 1014 { 1015 p=(unsigned char *)s->init_buf->data; 1016 1017 /* do the header */ 1018 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0); 1019 1020 s->state=SSL3_ST_SW_SRVR_DONE_B; 1021 /* number of bytes to write */ 1022 s->init_num=DTLS1_HM_HEADER_LENGTH; 1023 s->init_off=0; 1024 1025 /* buffer the message to handle re-xmits */ 1026 dtls1_buffer_message(s, 0); 1027 } 1028 1029 /* SSL3_ST_SW_SRVR_DONE_B */ 1030 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1031 } 1032 1033 int dtls1_send_server_key_exchange(SSL *s) 1034 { 1035 #ifndef OPENSSL_NO_RSA 1036 unsigned char *q; 1037 int j,num; 1038 RSA *rsa; 1039 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH]; 1040 unsigned int u; 1041 #endif 1042 #ifndef OPENSSL_NO_DH 1043 DH *dh=NULL,*dhp; 1044 #endif 1045 #ifndef OPENSSL_NO_ECDH 1046 EC_KEY *ecdh=NULL, *ecdhp; 1047 unsigned char *encodedPoint = NULL; 1048 int encodedlen = 0; 1049 int curve_id = 0; 1050 BN_CTX *bn_ctx = NULL; 1051 #endif 1052 EVP_PKEY *pkey; 1053 unsigned char *p,*d; 1054 int al,i; 1055 unsigned long type; 1056 int n; 1057 CERT *cert; 1058 BIGNUM *r[4]; 1059 int nr[4],kn; 1060 BUF_MEM *buf; 1061 EVP_MD_CTX md_ctx; 1062 1063 EVP_MD_CTX_init(&md_ctx); 1064 if (s->state == SSL3_ST_SW_KEY_EXCH_A) 1065 { 1066 type=s->s3->tmp.new_cipher->algorithm_mkey; 1067 cert=s->cert; 1068 1069 buf=s->init_buf; 1070 1071 r[0]=r[1]=r[2]=r[3]=NULL; 1072 n=0; 1073 #ifndef OPENSSL_NO_RSA 1074 if (type & SSL_kRSA) 1075 { 1076 rsa=cert->rsa_tmp; 1077 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL)) 1078 { 1079 rsa=s->cert->rsa_tmp_cb(s, 1080 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1081 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1082 if(rsa == NULL) 1083 { 1084 al=SSL_AD_HANDSHAKE_FAILURE; 1085 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY); 1086 goto f_err; 1087 } 1088 RSA_up_ref(rsa); 1089 cert->rsa_tmp=rsa; 1090 } 1091 if (rsa == NULL) 1092 { 1093 al=SSL_AD_HANDSHAKE_FAILURE; 1094 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY); 1095 goto f_err; 1096 } 1097 r[0]=rsa->n; 1098 r[1]=rsa->e; 1099 s->s3->tmp.use_rsa_tmp=1; 1100 } 1101 else 1102 #endif 1103 #ifndef OPENSSL_NO_DH 1104 if (type & SSL_kEDH) 1105 { 1106 dhp=cert->dh_tmp; 1107 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL)) 1108 dhp=s->cert->dh_tmp_cb(s, 1109 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1110 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1111 if (dhp == NULL) 1112 { 1113 al=SSL_AD_HANDSHAKE_FAILURE; 1114 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY); 1115 goto f_err; 1116 } 1117 1118 if (s->s3->tmp.dh != NULL) 1119 { 1120 DH_free(dh); 1121 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1122 goto err; 1123 } 1124 1125 if ((dh=DHparams_dup(dhp)) == NULL) 1126 { 1127 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1128 goto err; 1129 } 1130 1131 s->s3->tmp.dh=dh; 1132 if ((dhp->pub_key == NULL || 1133 dhp->priv_key == NULL || 1134 (s->options & SSL_OP_SINGLE_DH_USE))) 1135 { 1136 if(!DH_generate_key(dh)) 1137 { 1138 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, 1139 ERR_R_DH_LIB); 1140 goto err; 1141 } 1142 } 1143 else 1144 { 1145 dh->pub_key=BN_dup(dhp->pub_key); 1146 dh->priv_key=BN_dup(dhp->priv_key); 1147 if ((dh->pub_key == NULL) || 1148 (dh->priv_key == NULL)) 1149 { 1150 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB); 1151 goto err; 1152 } 1153 } 1154 r[0]=dh->p; 1155 r[1]=dh->g; 1156 r[2]=dh->pub_key; 1157 } 1158 else 1159 #endif 1160 #ifndef OPENSSL_NO_ECDH 1161 if (type & SSL_kEECDH) 1162 { 1163 const EC_GROUP *group; 1164 1165 ecdhp=cert->ecdh_tmp; 1166 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL)) 1167 { 1168 ecdhp=s->cert->ecdh_tmp_cb(s, 1169 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher), 1170 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)); 1171 } 1172 if (ecdhp == NULL) 1173 { 1174 al=SSL_AD_HANDSHAKE_FAILURE; 1175 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY); 1176 goto f_err; 1177 } 1178 1179 if (s->s3->tmp.ecdh != NULL) 1180 { 1181 EC_KEY_free(s->s3->tmp.ecdh); 1182 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); 1183 goto err; 1184 } 1185 1186 /* Duplicate the ECDH structure. */ 1187 if (ecdhp == NULL) 1188 { 1189 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1190 goto err; 1191 } 1192 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) 1193 { 1194 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1195 goto err; 1196 } 1197 1198 s->s3->tmp.ecdh=ecdh; 1199 if ((EC_KEY_get0_public_key(ecdh) == NULL) || 1200 (EC_KEY_get0_private_key(ecdh) == NULL) || 1201 (s->options & SSL_OP_SINGLE_ECDH_USE)) 1202 { 1203 if(!EC_KEY_generate_key(ecdh)) 1204 { 1205 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1206 goto err; 1207 } 1208 } 1209 1210 if (((group = EC_KEY_get0_group(ecdh)) == NULL) || 1211 (EC_KEY_get0_public_key(ecdh) == NULL) || 1212 (EC_KEY_get0_private_key(ecdh) == NULL)) 1213 { 1214 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1215 goto err; 1216 } 1217 1218 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && 1219 (EC_GROUP_get_degree(group) > 163)) 1220 { 1221 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER); 1222 goto err; 1223 } 1224 1225 /* XXX: For now, we only support ephemeral ECDH 1226 * keys over named (not generic) curves. For 1227 * supported named curves, curve_id is non-zero. 1228 */ 1229 if ((curve_id = 1230 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group))) 1231 == 0) 1232 { 1233 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE); 1234 goto err; 1235 } 1236 1237 /* Encode the public key. 1238 * First check the size of encoding and 1239 * allocate memory accordingly. 1240 */ 1241 encodedlen = EC_POINT_point2oct(group, 1242 EC_KEY_get0_public_key(ecdh), 1243 POINT_CONVERSION_UNCOMPRESSED, 1244 NULL, 0, NULL); 1245 1246 encodedPoint = (unsigned char *) 1247 OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 1248 bn_ctx = BN_CTX_new(); 1249 if ((encodedPoint == NULL) || (bn_ctx == NULL)) 1250 { 1251 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE); 1252 goto err; 1253 } 1254 1255 1256 encodedlen = EC_POINT_point2oct(group, 1257 EC_KEY_get0_public_key(ecdh), 1258 POINT_CONVERSION_UNCOMPRESSED, 1259 encodedPoint, encodedlen, bn_ctx); 1260 1261 if (encodedlen == 0) 1262 { 1263 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB); 1264 goto err; 1265 } 1266 1267 BN_CTX_free(bn_ctx); bn_ctx=NULL; 1268 1269 /* XXX: For now, we only support named (not 1270 * generic) curves in ECDH ephemeral key exchanges. 1271 * In this situation, we need four additional bytes 1272 * to encode the entire ServerECDHParams 1273 * structure. 1274 */ 1275 n = 4 + encodedlen; 1276 1277 /* We'll generate the serverKeyExchange message 1278 * explicitly so we can set these to NULLs 1279 */ 1280 r[0]=NULL; 1281 r[1]=NULL; 1282 r[2]=NULL; 1283 r[3]=NULL; 1284 } 1285 else 1286 #endif /* !OPENSSL_NO_ECDH */ 1287 #ifndef OPENSSL_NO_PSK 1288 if (type & SSL_kPSK) 1289 { 1290 /* reserve size for record length and PSK identity hint*/ 1291 n+=2+strlen(s->session->psk_identity_hint); 1292 } 1293 else 1294 #endif /* !OPENSSL_NO_PSK */ 1295 { 1296 al=SSL_AD_HANDSHAKE_FAILURE; 1297 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE); 1298 goto f_err; 1299 } 1300 for (i=0; r[i] != NULL; i++) 1301 { 1302 nr[i]=BN_num_bytes(r[i]); 1303 n+=2+nr[i]; 1304 } 1305 1306 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) 1307 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) 1308 { 1309 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL)) 1310 == NULL) 1311 { 1312 al=SSL_AD_DECODE_ERROR; 1313 goto f_err; 1314 } 1315 kn=EVP_PKEY_size(pkey); 1316 } 1317 else 1318 { 1319 pkey=NULL; 1320 kn=0; 1321 } 1322 1323 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn)) 1324 { 1325 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF); 1326 goto err; 1327 } 1328 d=(unsigned char *)s->init_buf->data; 1329 p= &(d[DTLS1_HM_HEADER_LENGTH]); 1330 1331 for (i=0; r[i] != NULL; i++) 1332 { 1333 s2n(nr[i],p); 1334 BN_bn2bin(r[i],p); 1335 p+=nr[i]; 1336 } 1337 1338 #ifndef OPENSSL_NO_ECDH 1339 if (type & SSL_kEECDH) 1340 { 1341 /* XXX: For now, we only support named (not generic) curves. 1342 * In this situation, the serverKeyExchange message has: 1343 * [1 byte CurveType], [2 byte CurveName] 1344 * [1 byte length of encoded point], followed by 1345 * the actual encoded point itself 1346 */ 1347 *p = NAMED_CURVE_TYPE; 1348 p += 1; 1349 *p = 0; 1350 p += 1; 1351 *p = curve_id; 1352 p += 1; 1353 *p = encodedlen; 1354 p += 1; 1355 memcpy((unsigned char*)p, 1356 (unsigned char *)encodedPoint, 1357 encodedlen); 1358 OPENSSL_free(encodedPoint); 1359 encodedPoint = NULL; 1360 p += encodedlen; 1361 } 1362 #endif 1363 1364 #ifndef OPENSSL_NO_PSK 1365 if (type & SSL_kPSK) 1366 { 1367 /* copy PSK identity hint */ 1368 s2n(strlen(s->session->psk_identity_hint), p); 1369 strncpy((char *)p, s->session->psk_identity_hint, strlen(s->session->psk_identity_hint)); 1370 p+=strlen(s->session->psk_identity_hint); 1371 } 1372 #endif 1373 1374 /* not anonymous */ 1375 if (pkey != NULL) 1376 { 1377 /* n is the length of the params, they start at 1378 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space 1379 * at the end. */ 1380 #ifndef OPENSSL_NO_RSA 1381 if (pkey->type == EVP_PKEY_RSA) 1382 { 1383 q=md_buf; 1384 j=0; 1385 for (num=2; num > 0; num--) 1386 { 1387 EVP_DigestInit_ex(&md_ctx,(num == 2) 1388 ?s->ctx->md5:s->ctx->sha1, NULL); 1389 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1390 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1391 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1392 EVP_DigestFinal_ex(&md_ctx,q, 1393 (unsigned int *)&i); 1394 q+=i; 1395 j+=i; 1396 } 1397 if (RSA_sign(NID_md5_sha1, md_buf, j, 1398 &(p[2]), &u, pkey->pkey.rsa) <= 0) 1399 { 1400 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA); 1401 goto err; 1402 } 1403 s2n(u,p); 1404 n+=u+2; 1405 } 1406 else 1407 #endif 1408 #if !defined(OPENSSL_NO_DSA) 1409 if (pkey->type == EVP_PKEY_DSA) 1410 { 1411 /* lets do DSS */ 1412 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL); 1413 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1414 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1415 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1416 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1417 (unsigned int *)&i,pkey)) 1418 { 1419 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA); 1420 goto err; 1421 } 1422 s2n(i,p); 1423 n+=i+2; 1424 } 1425 else 1426 #endif 1427 #if !defined(OPENSSL_NO_ECDSA) 1428 if (pkey->type == EVP_PKEY_EC) 1429 { 1430 /* let's do ECDSA */ 1431 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL); 1432 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE); 1433 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE); 1434 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n); 1435 if (!EVP_SignFinal(&md_ctx,&(p[2]), 1436 (unsigned int *)&i,pkey)) 1437 { 1438 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA); 1439 goto err; 1440 } 1441 s2n(i,p); 1442 n+=i+2; 1443 } 1444 else 1445 #endif 1446 { 1447 /* Is this error check actually needed? */ 1448 al=SSL_AD_HANDSHAKE_FAILURE; 1449 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE); 1450 goto f_err; 1451 } 1452 } 1453 1454 d = dtls1_set_message_header(s, d, 1455 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n); 1456 1457 /* we should now have things packed up, so lets send 1458 * it off */ 1459 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1460 s->init_off=0; 1461 1462 /* buffer the message to handle re-xmits */ 1463 dtls1_buffer_message(s, 0); 1464 } 1465 1466 s->state = SSL3_ST_SW_KEY_EXCH_B; 1467 EVP_MD_CTX_cleanup(&md_ctx); 1468 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1469 f_err: 1470 ssl3_send_alert(s,SSL3_AL_FATAL,al); 1471 err: 1472 #ifndef OPENSSL_NO_ECDH 1473 if (encodedPoint != NULL) OPENSSL_free(encodedPoint); 1474 BN_CTX_free(bn_ctx); 1475 #endif 1476 EVP_MD_CTX_cleanup(&md_ctx); 1477 return(-1); 1478 } 1479 1480 int dtls1_send_certificate_request(SSL *s) 1481 { 1482 unsigned char *p,*d; 1483 int i,j,nl,off,n; 1484 STACK_OF(X509_NAME) *sk=NULL; 1485 X509_NAME *name; 1486 BUF_MEM *buf; 1487 unsigned int msg_len; 1488 1489 if (s->state == SSL3_ST_SW_CERT_REQ_A) 1490 { 1491 buf=s->init_buf; 1492 1493 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]); 1494 1495 /* get the list of acceptable cert types */ 1496 p++; 1497 n=ssl3_get_req_cert_type(s,p); 1498 d[0]=n; 1499 p+=n; 1500 n++; 1501 1502 off=n; 1503 p+=2; 1504 n+=2; 1505 1506 sk=SSL_get_client_CA_list(s); 1507 nl=0; 1508 if (sk != NULL) 1509 { 1510 for (i=0; i<sk_X509_NAME_num(sk); i++) 1511 { 1512 name=sk_X509_NAME_value(sk,i); 1513 j=i2d_X509_NAME(name,NULL); 1514 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2)) 1515 { 1516 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB); 1517 goto err; 1518 } 1519 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]); 1520 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG)) 1521 { 1522 s2n(j,p); 1523 i2d_X509_NAME(name,&p); 1524 n+=2+j; 1525 nl+=2+j; 1526 } 1527 else 1528 { 1529 d=p; 1530 i2d_X509_NAME(name,&p); 1531 j-=2; s2n(j,d); j+=2; 1532 n+=j; 1533 nl+=j; 1534 } 1535 } 1536 } 1537 /* else no CA names */ 1538 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]); 1539 s2n(nl,p); 1540 1541 d=(unsigned char *)buf->data; 1542 *(d++)=SSL3_MT_CERTIFICATE_REQUEST; 1543 l2n3(n,d); 1544 s2n(s->d1->handshake_write_seq,d); 1545 s->d1->handshake_write_seq++; 1546 1547 /* we should now have things packed up, so lets send 1548 * it off */ 1549 1550 s->init_num=n+DTLS1_HM_HEADER_LENGTH; 1551 s->init_off=0; 1552 #ifdef NETSCAPE_HANG_BUG 1553 /* XXX: what to do about this? */ 1554 p=(unsigned char *)s->init_buf->data + s->init_num; 1555 1556 /* do the header */ 1557 *(p++)=SSL3_MT_SERVER_DONE; 1558 *(p++)=0; 1559 *(p++)=0; 1560 *(p++)=0; 1561 s->init_num += 4; 1562 #endif 1563 1564 /* XDTLS: set message header ? */ 1565 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1566 dtls1_set_message_header(s, (void *)s->init_buf->data, 1567 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len); 1568 1569 /* buffer the message to handle re-xmits */ 1570 dtls1_buffer_message(s, 0); 1571 1572 s->state = SSL3_ST_SW_CERT_REQ_B; 1573 } 1574 1575 /* SSL3_ST_SW_CERT_REQ_B */ 1576 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1577 err: 1578 return(-1); 1579 } 1580 1581 int dtls1_send_server_certificate(SSL *s) 1582 { 1583 unsigned long l; 1584 X509 *x; 1585 1586 if (s->state == SSL3_ST_SW_CERT_A) 1587 { 1588 x=ssl_get_server_send_cert(s); 1589 if (x == NULL) 1590 { 1591 /* VRS: allow null cert if auth == KRB5 */ 1592 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) || 1593 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5)) 1594 { 1595 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR); 1596 return(0); 1597 } 1598 } 1599 1600 l=dtls1_output_cert_chain(s,x); 1601 s->state=SSL3_ST_SW_CERT_B; 1602 s->init_num=(int)l; 1603 s->init_off=0; 1604 1605 /* buffer the message to handle re-xmits */ 1606 dtls1_buffer_message(s, 0); 1607 } 1608 1609 /* SSL3_ST_SW_CERT_B */ 1610 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1611 } 1612 1613 #ifndef OPENSSL_NO_TLSEXT 1614 int dtls1_send_newsession_ticket(SSL *s) 1615 { 1616 if (s->state == SSL3_ST_SW_SESSION_TICKET_A) 1617 { 1618 unsigned char *p, *senc, *macstart; 1619 int len, slen; 1620 unsigned int hlen, msg_len; 1621 EVP_CIPHER_CTX ctx; 1622 HMAC_CTX hctx; 1623 SSL_CTX *tctx = s->initial_ctx; 1624 unsigned char iv[EVP_MAX_IV_LENGTH]; 1625 unsigned char key_name[16]; 1626 1627 /* get session encoding length */ 1628 slen = i2d_SSL_SESSION(s->session, NULL); 1629 /* Some length values are 16 bits, so forget it if session is 1630 * too long 1631 */ 1632 if (slen > 0xFF00) 1633 return -1; 1634 /* Grow buffer if need be: the length calculation is as 1635 * follows 12 (DTLS handshake message header) + 1636 * 4 (ticket lifetime hint) + 2 (ticket length) + 1637 * 16 (key name) + max_iv_len (iv length) + 1638 * session_length + max_enc_block_size (max encrypted session 1639 * length) + max_md_size (HMAC). 1640 */ 1641 if (!BUF_MEM_grow(s->init_buf, 1642 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH + 1643 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) 1644 return -1; 1645 senc = OPENSSL_malloc(slen); 1646 if (!senc) 1647 return -1; 1648 p = senc; 1649 i2d_SSL_SESSION(s->session, &p); 1650 1651 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]); 1652 EVP_CIPHER_CTX_init(&ctx); 1653 HMAC_CTX_init(&hctx); 1654 /* Initialize HMAC and cipher contexts. If callback present 1655 * it does all the work otherwise use generated values 1656 * from parent ctx. 1657 */ 1658 if (tctx->tlsext_ticket_key_cb) 1659 { 1660 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx, 1661 &hctx, 1) < 0) 1662 { 1663 OPENSSL_free(senc); 1664 return -1; 1665 } 1666 } 1667 else 1668 { 1669 RAND_pseudo_bytes(iv, 16); 1670 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, 1671 tctx->tlsext_tick_aes_key, iv); 1672 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, 1673 tlsext_tick_md(), NULL); 1674 memcpy(key_name, tctx->tlsext_tick_key_name, 16); 1675 } 1676 l2n(s->session->tlsext_tick_lifetime_hint, p); 1677 /* Skip ticket length for now */ 1678 p += 2; 1679 /* Output key name */ 1680 macstart = p; 1681 memcpy(p, key_name, 16); 1682 p += 16; 1683 /* output IV */ 1684 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx)); 1685 p += EVP_CIPHER_CTX_iv_length(&ctx); 1686 /* Encrypt session data */ 1687 EVP_EncryptUpdate(&ctx, p, &len, senc, slen); 1688 p += len; 1689 EVP_EncryptFinal(&ctx, p, &len); 1690 p += len; 1691 EVP_CIPHER_CTX_cleanup(&ctx); 1692 1693 HMAC_Update(&hctx, macstart, p - macstart); 1694 HMAC_Final(&hctx, p, &hlen); 1695 HMAC_CTX_cleanup(&hctx); 1696 1697 p += hlen; 1698 /* Now write out lengths: p points to end of data written */ 1699 /* Total length */ 1700 len = p - (unsigned char *)(s->init_buf->data); 1701 /* Ticket length */ 1702 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4; 1703 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p); 1704 1705 /* number of bytes to write */ 1706 s->init_num= len; 1707 s->state=SSL3_ST_SW_SESSION_TICKET_B; 1708 s->init_off=0; 1709 OPENSSL_free(senc); 1710 1711 /* XDTLS: set message header ? */ 1712 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH; 1713 dtls1_set_message_header(s, (void *)s->init_buf->data, 1714 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len); 1715 1716 /* buffer the message to handle re-xmits */ 1717 dtls1_buffer_message(s, 0); 1718 } 1719 1720 /* SSL3_ST_SW_SESSION_TICKET_B */ 1721 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE)); 1722 } 1723 #endif 1724