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 #ifndef OPENSSL_NO_KRB5
119 # include "kssl_lcl.h"
121 #include <openssl/buffer.h>
122 #include <openssl/rand.h>
123 #include <openssl/objects.h>
124 #include <openssl/evp.h>
125 #include <openssl/md5.h>
126 #include <openssl/bn.h>
127 #ifndef OPENSSL_NO_DH
128 # include <openssl/dh.h>
131 static const SSL_METHOD *dtls1_get_client_method(int ver);
132 static int dtls1_get_hello_verify(SSL *s);
134 static const SSL_METHOD *dtls1_get_client_method(int ver)
136 if (ver == DTLS_ANY_VERSION)
137 return DTLS_client_method();
138 else if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
139 return DTLSv1_client_method();
140 else if (ver == DTLS1_2_VERSION)
141 return DTLSv1_2_client_method();
146 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
147 DTLSv1_client_method,
148 ssl_undefined_function,
150 dtls1_get_client_method, DTLSv1_enc_data)
152 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
153 DTLSv1_2_client_method,
154 ssl_undefined_function,
156 dtls1_get_client_method, DTLSv1_2_enc_data)
158 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
160 ssl_undefined_function,
162 dtls1_get_client_method, DTLSv1_2_enc_data)
164 int dtls1_connect(SSL *s)
167 unsigned long Time = (unsigned long)time(NULL);
168 void (*cb) (const SSL *ssl, int type, int val) = NULL;
170 int new_state, state, skip = 0;
171 #ifndef OPENSSL_NO_SCTP
172 unsigned char sctpauthkey[64];
173 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
176 RAND_add(&Time, sizeof(Time), 0);
180 if (s->info_callback != NULL)
181 cb = s->info_callback;
182 else if (s->ctx->info_callback != NULL)
183 cb = s->ctx->info_callback;
186 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_CONNECT;
218 s->ctx->stats.sess_connect_renegotiate++;
222 case SSL_ST_BEFORE | SSL_ST_CONNECT:
223 case SSL_ST_OK | SSL_ST_CONNECT:
227 cb(s, SSL_CB_HANDSHAKE_START, 1);
229 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
230 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
231 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
233 s->state = SSL_ST_ERR;
237 /* s->version=SSL3_VERSION; */
238 s->type = SSL_ST_CONNECT;
240 if (s->init_buf == NULL) {
241 if ((buf = BUF_MEM_new()) == NULL) {
243 s->state = SSL_ST_ERR;
246 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
248 s->state = SSL_ST_ERR;
255 if (!ssl3_setup_buffers(s)) {
257 s->state = SSL_ST_ERR;
261 /* setup buffing BIO */
262 if (!ssl_init_wbio_buffer(s, 0)) {
264 s->state = SSL_ST_ERR;
268 /* don't push the buffering BIO quite yet */
270 s->state = SSL3_ST_CW_CLNT_HELLO_A;
271 s->ctx->stats.sess_connect++;
273 /* mark client_random uninitialized */
274 memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
275 s->d1->send_cookie = 0;
277 s->d1->change_cipher_spec_ok = 0;
279 * Should have been reset by ssl3_get_finished, too.
281 s->s3->change_cipher_spec = 0;
284 #ifndef OPENSSL_NO_SCTP
285 case DTLS1_SCTP_ST_CR_READ_SOCK:
287 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
288 s->s3->in_read_app_data = 2;
289 s->rwstate = SSL_READING;
290 BIO_clear_retry_flags(SSL_get_rbio(s));
291 BIO_set_retry_read(SSL_get_rbio(s));
296 s->state = s->s3->tmp.next_state;
299 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
300 /* read app data until dry event */
302 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
307 s->s3->in_read_app_data = 2;
308 s->rwstate = SSL_READING;
309 BIO_clear_retry_flags(SSL_get_rbio(s));
310 BIO_set_retry_read(SSL_get_rbio(s));
315 s->state = s->d1->next_state;
319 case SSL3_ST_CW_CLNT_HELLO_A:
322 /* every DTLS ClientHello resets Finished MAC */
323 ssl3_init_finished_mac(s);
325 case SSL3_ST_CW_CLNT_HELLO_B:
326 dtls1_start_timer(s);
327 ret = ssl3_client_hello(s);
331 if (s->d1->send_cookie) {
332 s->state = SSL3_ST_CW_FLUSH;
333 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
335 s->state = SSL3_ST_CR_SRVR_HELLO_A;
339 #ifndef OPENSSL_NO_SCTP
340 /* Disable buffering for SCTP */
341 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
344 * turn on buffering for the next lot of output
346 if (s->bbio != s->wbio)
347 s->wbio = BIO_push(s->bbio, s->wbio);
348 #ifndef OPENSSL_NO_SCTP
354 case SSL3_ST_CR_SRVR_HELLO_A:
355 case SSL3_ST_CR_SRVR_HELLO_B:
356 ret = ssl3_get_server_hello(s);
361 #ifndef OPENSSL_NO_SCTP
363 * Add new shared key for SCTP-Auth, will be ignored if
366 snprintf((char *)labelbuffer,
367 sizeof(DTLS1_SCTP_AUTH_LABEL),
368 DTLS1_SCTP_AUTH_LABEL);
370 if (SSL_export_keying_material(s, sctpauthkey,
373 sizeof(labelbuffer), NULL, 0,
376 s->state = SSL_ST_ERR;
380 BIO_ctrl(SSL_get_wbio(s),
381 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
382 sizeof(sctpauthkey), sctpauthkey);
385 s->state = SSL3_ST_CR_FINISHED_A;
386 if (s->tlsext_ticket_expected) {
387 /* receive renewed session ticket */
388 s->state = SSL3_ST_CR_SESSION_TICKET_A;
391 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
396 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
397 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
399 ret = dtls1_get_hello_verify(s);
403 if (s->d1->send_cookie) /* start again, with a cookie */
404 s->state = SSL3_ST_CW_CLNT_HELLO_A;
406 s->state = SSL3_ST_CR_CERT_A;
410 case SSL3_ST_CR_CERT_A:
411 case SSL3_ST_CR_CERT_B:
412 /* Check if it is anon DH or PSK */
413 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
414 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
415 ret = ssl3_get_server_certificate(s);
418 #ifndef OPENSSL_NO_TLSEXT
419 if (s->tlsext_status_expected)
420 s->state = SSL3_ST_CR_CERT_STATUS_A;
422 s->state = SSL3_ST_CR_KEY_EXCH_A;
425 s->state = SSL3_ST_CR_KEY_EXCH_A;
431 s->state = SSL3_ST_CR_KEY_EXCH_A;
436 case SSL3_ST_CR_KEY_EXCH_A:
437 case SSL3_ST_CR_KEY_EXCH_B:
438 ret = ssl3_get_key_exchange(s);
441 s->state = SSL3_ST_CR_CERT_REQ_A;
445 * at this point we check that we have the required stuff from
448 if (!ssl3_check_cert_and_algorithm(s)) {
450 s->state = SSL_ST_ERR;
455 case SSL3_ST_CR_CERT_REQ_A:
456 case SSL3_ST_CR_CERT_REQ_B:
457 ret = ssl3_get_certificate_request(s);
460 s->state = SSL3_ST_CR_SRVR_DONE_A;
464 case SSL3_ST_CR_SRVR_DONE_A:
465 case SSL3_ST_CR_SRVR_DONE_B:
466 ret = ssl3_get_server_done(s);
470 if (s->s3->tmp.cert_req)
471 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
473 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
476 #ifndef OPENSSL_NO_SCTP
477 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
478 state == SSL_ST_RENEGOTIATE)
479 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
482 s->state = s->s3->tmp.next_state;
485 case SSL3_ST_CW_CERT_A:
486 case SSL3_ST_CW_CERT_B:
487 case SSL3_ST_CW_CERT_C:
488 case SSL3_ST_CW_CERT_D:
489 dtls1_start_timer(s);
490 ret = ssl3_send_client_certificate(s);
493 s->state = SSL3_ST_CW_KEY_EXCH_A;
497 case SSL3_ST_CW_KEY_EXCH_A:
498 case SSL3_ST_CW_KEY_EXCH_B:
499 dtls1_start_timer(s);
500 ret = ssl3_send_client_key_exchange(s);
504 #ifndef OPENSSL_NO_SCTP
506 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
509 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
510 DTLS1_SCTP_AUTH_LABEL);
512 if (SSL_export_keying_material(s, sctpauthkey,
513 sizeof(sctpauthkey), labelbuffer,
514 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
516 s->state = SSL_ST_ERR;
520 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
521 sizeof(sctpauthkey), sctpauthkey);
525 * EAY EAY EAY need to check for DH fix cert sent back
528 * For TLS, cert_req is set to 2, so a cert chain of nothing is
529 * sent, but no verify packet is sent
531 if (s->s3->tmp.cert_req == 1) {
532 s->state = SSL3_ST_CW_CERT_VRFY_A;
534 #ifndef OPENSSL_NO_SCTP
535 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
536 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
537 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
540 s->state = SSL3_ST_CW_CHANGE_A;
546 case SSL3_ST_CW_CERT_VRFY_A:
547 case SSL3_ST_CW_CERT_VRFY_B:
548 dtls1_start_timer(s);
549 ret = ssl3_send_client_verify(s);
552 #ifndef OPENSSL_NO_SCTP
553 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
554 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
555 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
558 s->state = SSL3_ST_CW_CHANGE_A;
562 case SSL3_ST_CW_CHANGE_A:
563 case SSL3_ST_CW_CHANGE_B:
565 dtls1_start_timer(s);
566 ret = dtls1_send_change_cipher_spec(s,
568 SSL3_ST_CW_CHANGE_B);
572 s->state = SSL3_ST_CW_FINISHED_A;
575 s->session->cipher = s->s3->tmp.new_cipher;
576 #ifdef OPENSSL_NO_COMP
577 s->session->compress_meth = 0;
579 if (s->s3->tmp.new_compression == NULL)
580 s->session->compress_meth = 0;
582 s->session->compress_meth = s->s3->tmp.new_compression->id;
584 if (!s->method->ssl3_enc->setup_key_block(s)) {
586 s->state = SSL_ST_ERR;
590 if (!s->method->ssl3_enc->change_cipher_state(s,
591 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
594 s->state = SSL_ST_ERR;
597 #ifndef OPENSSL_NO_SCTP
600 * Change to new shared key of SCTP-Auth, will be ignored if
603 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
608 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
611 case SSL3_ST_CW_FINISHED_A:
612 case SSL3_ST_CW_FINISHED_B:
614 dtls1_start_timer(s);
615 ret = ssl3_send_finished(s,
616 SSL3_ST_CW_FINISHED_A,
617 SSL3_ST_CW_FINISHED_B,
619 ssl3_enc->client_finished_label,
621 ssl3_enc->client_finished_label_len);
624 s->state = SSL3_ST_CW_FLUSH;
627 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
629 s->s3->tmp.next_state = SSL_ST_OK;
630 #ifndef OPENSSL_NO_SCTP
631 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
632 s->d1->next_state = s->s3->tmp.next_state;
633 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
636 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
637 s->state = SSL_ST_OK;
638 #ifndef OPENSSL_NO_SCTP
639 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
640 s->d1->next_state = SSL_ST_OK;
641 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
644 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
645 s->s3->delay_buf_pop_ret = 0;
648 #ifndef OPENSSL_NO_SCTP
650 * Change to new shared key of SCTP-Auth, will be ignored if
653 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
657 #ifndef OPENSSL_NO_TLSEXT
659 * Allow NewSessionTicket if ticket expected
661 if (s->tlsext_ticket_expected)
662 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
666 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
671 #ifndef OPENSSL_NO_TLSEXT
672 case SSL3_ST_CR_SESSION_TICKET_A:
673 case SSL3_ST_CR_SESSION_TICKET_B:
674 ret = ssl3_get_new_session_ticket(s);
677 s->state = SSL3_ST_CR_FINISHED_A;
681 case SSL3_ST_CR_CERT_STATUS_A:
682 case SSL3_ST_CR_CERT_STATUS_B:
683 ret = ssl3_get_cert_status(s);
686 s->state = SSL3_ST_CR_KEY_EXCH_A;
691 case SSL3_ST_CR_FINISHED_A:
692 case SSL3_ST_CR_FINISHED_B:
693 s->d1->change_cipher_spec_ok = 1;
694 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
695 SSL3_ST_CR_FINISHED_B);
701 s->state = SSL3_ST_CW_CHANGE_A;
703 s->state = SSL_ST_OK;
705 #ifndef OPENSSL_NO_SCTP
706 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
707 state == SSL_ST_RENEGOTIATE) {
708 s->d1->next_state = s->state;
709 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
716 case SSL3_ST_CW_FLUSH:
717 s->rwstate = SSL_WRITING;
718 if (BIO_flush(s->wbio) <= 0) {
720 * If the write error was fatal, stop trying
722 if (!BIO_should_retry(s->wbio)) {
723 s->rwstate = SSL_NOTHING;
724 s->state = s->s3->tmp.next_state;
730 s->rwstate = SSL_NOTHING;
731 s->state = s->s3->tmp.next_state;
735 /* clean a few things up */
736 ssl3_cleanup_key_block(s);
739 if (s->init_buf != NULL) {
740 BUF_MEM_free(s->init_buf);
746 * If we are not 'joining' the last two packets, remove the
749 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
750 ssl_free_wbio_buffer(s);
751 /* else do it later in ssl3_write */
757 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
759 s->ctx->stats.sess_hit++;
763 s->handshake_func = dtls1_connect;
764 s->ctx->stats.sess_connect_good++;
767 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
769 /* done with handshaking */
770 s->d1->handshake_read_seq = 0;
771 s->d1->next_handshake_write_seq = 0;
772 dtls1_clear_received_buffer(s);
778 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
784 /* did we do anything */
785 if (!s->s3->tmp.reuse_message && !skip) {
787 if ((ret = BIO_flush(s->wbio)) <= 0)
791 if ((cb != NULL) && (s->state != state)) {
792 new_state = s->state;
794 cb(s, SSL_CB_CONNECT_LOOP, 1);
795 s->state = new_state;
803 #ifndef OPENSSL_NO_SCTP
805 * Notify SCTP BIO socket to leave handshake mode and allow stream
806 * identifier other than 0. Will be ignored if no SCTP is used.
808 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
809 s->in_handshake, NULL);
815 cb(s, SSL_CB_CONNECT_EXIT, ret);
819 static int dtls1_get_hello_verify(SSL *s)
823 unsigned int cookie_len;
826 n = s->method->ssl_get_message(s,
827 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
828 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
829 -1, s->max_cert_list, &ok);
835 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
836 s->d1->send_cookie = 0;
837 s->s3->tmp.reuse_message = 1;
841 data = (unsigned char *)s->init_msg;
843 if (s->method->version != DTLS_ANY_VERSION &&
844 ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))))
846 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
847 s->version = (s->version & 0xff00) | data[1];
848 al = SSL_AD_PROTOCOL_VERSION;
854 cookie_len = *(data++);
855 if (cookie_len > sizeof(s->d1->cookie)) {
856 al = SSL_AD_ILLEGAL_PARAMETER;
860 memcpy(s->d1->cookie, data, cookie_len);
861 s->d1->cookie_len = cookie_len;
863 s->d1->send_cookie = 1;
867 ssl3_send_alert(s, SSL3_AL_FATAL, al);
868 s->state = SSL_ST_ERR;