3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
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.
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).
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.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
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)"
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
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.]
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>
129 static const SSL_METHOD *dtls1_get_server_method(int ver);
130 static int dtls1_send_hello_verify_request(SSL *s);
132 static const SSL_METHOD *dtls1_get_server_method(int ver)
134 if (ver == DTLS1_VERSION)
135 return (DTLSv1_server_method());
136 else if (ver == DTLS1_2_VERSION)
137 return (DTLSv1_2_server_method());
142 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
143 DTLSv1_server_method,
145 ssl_undefined_function,
146 dtls1_get_server_method, DTLSv1_enc_data)
148 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
149 DTLSv1_2_server_method,
151 ssl_undefined_function,
152 dtls1_get_server_method, DTLSv1_2_enc_data)
154 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
157 ssl_undefined_function,
158 dtls1_get_server_method, DTLSv1_2_enc_data)
160 int dtls1_accept(SSL *s)
163 unsigned long Time = (unsigned long)time(NULL);
164 void (*cb) (const SSL *ssl, int type, int val) = NULL;
167 int new_state, state, skip = 0;
168 #ifndef OPENSSL_NO_SCTP
169 unsigned char sctpauthkey[64];
170 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
173 RAND_add(&Time, sizeof(Time), 0);
177 if (s->info_callback != NULL)
178 cb = s->info_callback;
179 else if (s->ctx->info_callback != NULL)
180 cb = s->ctx->info_callback;
182 /* init things to blank */
184 if (!SSL_in_init(s) || SSL_in_before(s)) {
189 #ifndef OPENSSL_NO_SCTP
191 * Notify SCTP BIO socket to enter handshake mode and prevent stream
192 * identifier other than 0. Will be ignored if no SCTP is used.
194 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
195 s->in_handshake, NULL);
198 #ifndef OPENSSL_NO_HEARTBEATS
200 * If we're awaiting a HeartbeatResponse, pretend we already got and
201 * don't await it anymore, because Heartbeats don't make sense during
204 if (s->tlsext_hb_pending) {
206 s->tlsext_hb_pending = 0;
215 case SSL_ST_RENEGOTIATE:
217 /* s->state=SSL_ST_ACCEPT; */
221 case SSL_ST_BEFORE | SSL_ST_ACCEPT:
222 case SSL_ST_OK | SSL_ST_ACCEPT:
226 cb(s, SSL_CB_HANDSHAKE_START, 1);
228 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00)) {
229 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
232 s->type = SSL_ST_ACCEPT;
234 if (s->init_buf == NULL) {
235 if ((buf = BUF_MEM_new()) == NULL) {
237 s->state = SSL_ST_ERR;
240 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
243 s->state = SSL_ST_ERR;
249 if (!ssl3_setup_buffers(s)) {
251 s->state = SSL_ST_ERR;
257 * Should have been reset by ssl3_get_finished, too.
259 s->s3->change_cipher_spec = 0;
261 if (s->state != SSL_ST_RENEGOTIATE) {
263 * Ok, we now need to push on a buffering BIO so that the
264 * output is sent in a way that TCP likes :-) ...but not with
267 #ifndef OPENSSL_NO_SCTP
268 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
270 if (!ssl_init_wbio_buffer(s, 1)) {
272 s->state = SSL_ST_ERR;
276 ssl3_init_finished_mac(s);
277 s->state = SSL3_ST_SR_CLNT_HELLO_A;
278 s->ctx->stats.sess_accept++;
281 * s->state == SSL_ST_RENEGOTIATE, we will just send a
284 s->ctx->stats.sess_accept_renegotiate++;
285 s->state = SSL3_ST_SW_HELLO_REQ_A;
290 case SSL3_ST_SW_HELLO_REQ_A:
291 case SSL3_ST_SW_HELLO_REQ_B:
294 dtls1_clear_record_buffer(s);
295 dtls1_start_timer(s);
296 ret = ssl3_send_hello_request(s);
299 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
300 s->state = SSL3_ST_SW_FLUSH;
303 ssl3_init_finished_mac(s);
306 case SSL3_ST_SW_HELLO_REQ_C:
307 s->state = SSL_ST_OK;
310 case SSL3_ST_SR_CLNT_HELLO_A:
311 case SSL3_ST_SR_CLNT_HELLO_B:
312 case SSL3_ST_SR_CLNT_HELLO_C:
315 ret = ssl3_get_client_hello(s);
320 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
321 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
323 s->state = SSL3_ST_SW_SRVR_HELLO_A;
328 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
329 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
331 ret = dtls1_send_hello_verify_request(s);
334 s->state = SSL3_ST_SW_FLUSH;
335 s->s3->tmp.next_state = SSL3_ST_SR_CLNT_HELLO_A;
337 /* HelloVerifyRequest resets Finished MAC */
338 if (s->version != DTLS1_BAD_VER)
339 ssl3_init_finished_mac(s);
342 #ifndef OPENSSL_NO_SCTP
343 case DTLS1_SCTP_ST_SR_READ_SOCK:
345 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
346 s->s3->in_read_app_data = 2;
347 s->rwstate = SSL_READING;
348 BIO_clear_retry_flags(SSL_get_rbio(s));
349 BIO_set_retry_read(SSL_get_rbio(s));
354 s->state = SSL3_ST_SR_CHANGE_A;
357 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
358 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
363 if (s->d1->next_state != SSL_ST_OK) {
364 s->s3->in_read_app_data = 2;
365 s->rwstate = SSL_READING;
366 BIO_clear_retry_flags(SSL_get_rbio(s));
367 BIO_set_retry_read(SSL_get_rbio(s));
373 s->state = s->d1->next_state;
377 case SSL3_ST_SW_SRVR_HELLO_A:
378 case SSL3_ST_SW_SRVR_HELLO_B:
380 dtls1_start_timer(s);
381 ret = ssl3_send_server_hello(s);
386 #ifndef OPENSSL_NO_SCTP
388 * Add new shared key for SCTP-Auth, will be ignored if no
391 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
392 DTLS1_SCTP_AUTH_LABEL);
394 if (SSL_export_keying_material(s, sctpauthkey,
395 sizeof(sctpauthkey), labelbuffer,
396 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
398 s->state = SSL_ST_ERR;
402 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
403 sizeof(sctpauthkey), sctpauthkey);
405 if (s->tlsext_ticket_expected)
406 s->state = SSL3_ST_SW_SESSION_TICKET_A;
408 s->state = SSL3_ST_SW_CHANGE_A;
410 s->state = SSL3_ST_SW_CERT_A;
414 case SSL3_ST_SW_CERT_A:
415 case SSL3_ST_SW_CERT_B:
416 /* Check if it is anon DH or normal PSK */
417 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
418 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
419 dtls1_start_timer(s);
420 ret = ssl3_send_server_certificate(s);
424 if (s->tlsext_status_expected)
425 s->state = SSL3_ST_SW_CERT_STATUS_A;
427 s->state = SSL3_ST_SW_KEY_EXCH_A;
430 s->state = SSL3_ST_SW_KEY_EXCH_A;
435 case SSL3_ST_SW_KEY_EXCH_A:
436 case SSL3_ST_SW_KEY_EXCH_B:
437 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
440 * clear this, it may get reset by
441 * send_server_key_exchange
443 s->s3->tmp.use_rsa_tmp = 0;
446 * only send if a DH key exchange or RSA but we have a sign only
451 * PSK: send ServerKeyExchange if PSK identity hint if
454 #ifndef OPENSSL_NO_PSK
455 || ((alg_k & SSL_kPSK) && s->cert->psk_identity_hint)
457 || (alg_k & SSL_kDHE)
458 || (alg_k & SSL_kECDHE)
459 || ((alg_k & SSL_kRSA)
460 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
461 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
462 && EVP_PKEY_size(s->cert->pkeys
463 [SSL_PKEY_RSA_ENC].privatekey) *
464 8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
469 dtls1_start_timer(s);
470 ret = ssl3_send_server_key_exchange(s);
476 s->state = SSL3_ST_SW_CERT_REQ_A;
480 case SSL3_ST_SW_CERT_REQ_A:
481 case SSL3_ST_SW_CERT_REQ_B:
482 if ( /* don't request cert unless asked for it: */
483 !(s->verify_mode & SSL_VERIFY_PEER) ||
485 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
486 * during re-negotiation:
488 ((s->session->peer != NULL) &&
489 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
491 * never request cert in anonymous ciphersuites (see
492 * section "Certificate request" in SSL 3 drafts and in
495 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
497 * ... except when the application insists on
498 * verification (against the specs, but s3_clnt.c accepts
501 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
503 * With normal PSK Certificates and Certificate Requests
506 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
507 /* no cert request */
509 s->s3->tmp.cert_request = 0;
510 s->state = SSL3_ST_SW_SRVR_DONE_A;
511 #ifndef OPENSSL_NO_SCTP
512 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
513 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
514 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
518 s->s3->tmp.cert_request = 1;
519 dtls1_start_timer(s);
520 ret = ssl3_send_certificate_request(s);
523 s->state = SSL3_ST_SW_SRVR_DONE_A;
524 # ifndef OPENSSL_NO_SCTP
525 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
526 s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
527 s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
534 case SSL3_ST_SW_SRVR_DONE_A:
535 case SSL3_ST_SW_SRVR_DONE_B:
536 dtls1_start_timer(s);
537 ret = ssl3_send_server_done(s);
540 s->s3->tmp.next_state = SSL3_ST_SR_CERT_A;
541 s->state = SSL3_ST_SW_FLUSH;
545 case SSL3_ST_SW_FLUSH:
546 s->rwstate = SSL_WRITING;
547 if (BIO_flush(s->wbio) <= 0) {
549 * If the write error was fatal, stop trying
551 if (!BIO_should_retry(s->wbio)) {
552 s->rwstate = SSL_NOTHING;
553 s->state = s->s3->tmp.next_state;
559 s->rwstate = SSL_NOTHING;
560 s->state = s->s3->tmp.next_state;
563 case SSL3_ST_SR_CERT_A:
564 case SSL3_ST_SR_CERT_B:
565 if (s->s3->tmp.cert_request) {
566 ret = ssl3_get_client_certificate(s);
571 s->state = SSL3_ST_SR_KEY_EXCH_A;
574 case SSL3_ST_SR_KEY_EXCH_A:
575 case SSL3_ST_SR_KEY_EXCH_B:
576 ret = ssl3_get_client_key_exchange(s);
579 #ifndef OPENSSL_NO_SCTP
581 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
584 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
585 DTLS1_SCTP_AUTH_LABEL);
587 if (SSL_export_keying_material(s, sctpauthkey,
588 sizeof(sctpauthkey), labelbuffer,
589 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
591 s->state = SSL_ST_ERR;
595 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
596 sizeof(sctpauthkey), sctpauthkey);
599 s->state = SSL3_ST_SR_CERT_VRFY_A;
604 * For the ECDH ciphersuites when the client sends its ECDH
605 * pub key in a certificate, the CertificateVerify message is
608 s->state = SSL3_ST_SR_CHANGE_A;
610 } else if (SSL_USE_SIGALGS(s)) {
611 s->state = SSL3_ST_SR_CERT_VRFY_A;
613 if (!s->session->peer)
615 if (!s->s3->handshake_buffer) {
616 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
617 s->state = SSL_ST_ERR;
621 * For sigalgs freeze the handshake buffer. If we support
622 * extms we've done this already.
624 if (!ssl3_digest_cached_records(s, 1)) {
625 s->state = SSL_ST_ERR;
629 s->state = SSL3_ST_SR_CERT_VRFY_A;
633 * We need to get hashes here so if there is a client cert,
636 s->method->ssl3_enc->cert_verify_mac(s,
641 s->method->ssl3_enc->cert_verify_mac(s, NID_sha1,
644 [MD5_DIGEST_LENGTH]));
648 case SSL3_ST_SR_CERT_VRFY_A:
649 case SSL3_ST_SR_CERT_VRFY_B:
650 ret = ssl3_get_cert_verify(s);
653 #ifndef OPENSSL_NO_SCTP
654 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
655 state == SSL_ST_RENEGOTIATE)
656 s->state = DTLS1_SCTP_ST_SR_READ_SOCK;
659 s->state = SSL3_ST_SR_CHANGE_A;
663 case SSL3_ST_SR_CHANGE_A:
664 case SSL3_ST_SR_CHANGE_B:
665 ret = ssl3_get_change_cipher_spec(s, SSL3_ST_SR_CHANGE_A,
666 SSL3_ST_SR_CHANGE_B);
670 s->state = SSL3_ST_SR_FINISHED_A;
674 case SSL3_ST_SR_FINISHED_A:
675 case SSL3_ST_SR_FINISHED_B:
676 ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A,
677 SSL3_ST_SR_FINISHED_B);
682 s->state = SSL_ST_OK;
683 else if (s->tlsext_ticket_expected)
684 s->state = SSL3_ST_SW_SESSION_TICKET_A;
686 s->state = SSL3_ST_SW_CHANGE_A;
690 case SSL3_ST_SW_SESSION_TICKET_A:
691 case SSL3_ST_SW_SESSION_TICKET_B:
692 ret = ssl3_send_newsession_ticket(s);
695 s->state = SSL3_ST_SW_CHANGE_A;
699 case SSL3_ST_SW_CERT_STATUS_A:
700 case SSL3_ST_SW_CERT_STATUS_B:
701 ret = ssl3_send_cert_status(s);
704 s->state = SSL3_ST_SW_KEY_EXCH_A;
708 case SSL3_ST_SW_CHANGE_A:
709 case SSL3_ST_SW_CHANGE_B:
711 s->session->cipher = s->s3->tmp.new_cipher;
712 if (!s->method->ssl3_enc->setup_key_block(s)) {
714 s->state = SSL_ST_ERR;
718 ret = dtls1_send_change_cipher_spec(s,
720 SSL3_ST_SW_CHANGE_B);
725 #ifndef OPENSSL_NO_SCTP
728 * Change to new shared key of SCTP-Auth, will be ignored if
731 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
736 s->state = SSL3_ST_SW_FINISHED_A;
739 if (!s->method->ssl3_enc->change_cipher_state(s,
740 SSL3_CHANGE_CIPHER_SERVER_WRITE))
743 s->state = SSL_ST_ERR;
747 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
750 case SSL3_ST_SW_FINISHED_A:
751 case SSL3_ST_SW_FINISHED_B:
752 ret = ssl3_send_finished(s,
753 SSL3_ST_SW_FINISHED_A,
754 SSL3_ST_SW_FINISHED_B,
756 ssl3_enc->server_finished_label,
758 ssl3_enc->server_finished_label_len);
761 s->state = SSL3_ST_SW_FLUSH;
763 s->s3->tmp.next_state = SSL3_ST_SR_CHANGE_A;
765 #ifndef OPENSSL_NO_SCTP
767 * Change to new shared key of SCTP-Auth, will be ignored if
770 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
774 s->s3->tmp.next_state = SSL_ST_OK;
775 #ifndef OPENSSL_NO_SCTP
776 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
777 s->d1->next_state = s->s3->tmp.next_state;
778 s->s3->tmp.next_state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
786 /* clean a few things up */
787 ssl3_cleanup_key_block(s);
789 /* remove buffering on output */
790 ssl_free_wbio_buffer(s);
794 if (s->renegotiate == 2) { /* skipped if we just sent a
799 ssl_update_cache(s, SSL_SESS_CACHE_SERVER);
801 s->ctx->stats.sess_accept_good++;
803 s->handshake_func = dtls1_accept;
806 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
811 /* done handshaking, next message is client hello */
812 s->d1->handshake_read_seq = 0;
813 /* next message is server hello */
814 s->d1->handshake_write_seq = 0;
815 s->d1->next_handshake_write_seq = 0;
821 SSLerr(SSL_F_DTLS1_ACCEPT, SSL_R_UNKNOWN_STATE);
827 if (!s->s3->tmp.reuse_message && !skip) {
829 if ((ret = BIO_flush(s->wbio)) <= 0)
833 if ((cb != NULL) && (s->state != state)) {
834 new_state = s->state;
836 cb(s, SSL_CB_ACCEPT_LOOP, 1);
837 s->state = new_state;
843 /* BIO_flush(s->wbio); */
846 #ifndef OPENSSL_NO_SCTP
848 * Notify SCTP BIO socket to leave handshake mode and prevent stream
849 * identifier other than 0. Will be ignored if no SCTP is used.
851 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
852 s->in_handshake, NULL);
856 cb(s, SSL_CB_ACCEPT_EXIT, ret);
860 unsigned int dtls1_raw_hello_verify_request(unsigned char *buf,
861 unsigned char *cookie,
862 unsigned char cookie_len)
864 unsigned int msg_len;
868 /* Always use DTLS 1.0 version: see RFC 6347 */
869 *(p++) = DTLS1_VERSION >> 8;
870 *(p++) = DTLS1_VERSION & 0xFF;
872 *(p++) = (unsigned char)cookie_len;
873 memcpy(p, cookie, cookie_len);
881 int dtls1_send_hello_verify_request(SSL *s)
886 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A) {
887 buf = (unsigned char *)s->init_buf->data;
889 if (s->ctx->app_gen_cookie_cb == NULL ||
890 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
891 &(s->d1->cookie_len)) == 0 ||
892 s->d1->cookie_len > 255) {
893 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,
894 SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
895 s->state = SSL_ST_ERR;
899 len = dtls1_raw_hello_verify_request(&buf[DTLS1_HM_HEADER_LENGTH],
900 s->d1->cookie, s->d1->cookie_len);
902 dtls1_set_message_header(s, buf, DTLS1_MT_HELLO_VERIFY_REQUEST, len, 0,
904 len += DTLS1_HM_HEADER_LENGTH;
906 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
907 /* number of bytes to write */
912 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
913 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));