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 == DTLS1_VERSION || ver == DTLS1_BAD_VER)
137 return (DTLSv1_client_method());
138 else if (ver == DTLS1_2_VERSION)
139 return (DTLSv1_2_client_method());
144 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
145 DTLSv1_client_method,
146 ssl_undefined_function,
148 dtls1_get_client_method, DTLSv1_enc_data)
150 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
151 DTLSv1_2_client_method,
152 ssl_undefined_function,
154 dtls1_get_client_method, DTLSv1_2_enc_data)
156 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
158 ssl_undefined_function,
160 dtls1_get_client_method, DTLSv1_2_enc_data)
162 int dtls1_connect(SSL *s)
165 unsigned long Time = (unsigned long)time(NULL);
166 void (*cb) (const SSL *ssl, int type, int val) = NULL;
168 int new_state, state, skip = 0;
169 #ifndef OPENSSL_NO_SCTP
170 unsigned char sctpauthkey[64];
171 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
174 RAND_add(&Time, sizeof(Time), 0);
178 if (s->info_callback != NULL)
179 cb = s->info_callback;
180 else if (s->ctx->info_callback != NULL)
181 cb = s->ctx->info_callback;
184 if (!SSL_in_init(s) || SSL_in_before(s))
187 #ifndef OPENSSL_NO_SCTP
189 * Notify SCTP BIO socket to enter handshake mode and prevent stream
190 * identifier other than 0. Will be ignored if no SCTP is used.
192 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
193 s->in_handshake, NULL);
196 #ifndef OPENSSL_NO_HEARTBEATS
198 * If we're awaiting a HeartbeatResponse, pretend we already got and
199 * don't await it anymore, because Heartbeats don't make sense during
202 if (s->tlsext_hb_pending) {
204 s->tlsext_hb_pending = 0;
213 case SSL_ST_RENEGOTIATE:
215 s->state = SSL_ST_CONNECT;
216 s->ctx->stats.sess_connect_renegotiate++;
220 case SSL_ST_BEFORE | SSL_ST_CONNECT:
221 case SSL_ST_OK | SSL_ST_CONNECT:
225 cb(s, SSL_CB_HANDSHAKE_START, 1);
227 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
228 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
229 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
231 s->state = SSL_ST_ERR;
235 /* s->version=SSL3_VERSION; */
236 s->type = SSL_ST_CONNECT;
238 if (s->init_buf == NULL) {
239 if ((buf = BUF_MEM_new()) == NULL) {
241 s->state = SSL_ST_ERR;
244 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
246 s->state = SSL_ST_ERR;
253 if (!ssl3_setup_buffers(s)) {
255 s->state = SSL_ST_ERR;
259 /* setup buffing BIO */
260 if (!ssl_init_wbio_buffer(s, 0)) {
262 s->state = SSL_ST_ERR;
266 /* don't push the buffering BIO quite yet */
268 s->state = SSL3_ST_CW_CLNT_HELLO_A;
269 s->ctx->stats.sess_connect++;
271 /* mark client_random uninitialized */
272 memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
273 s->d1->send_cookie = 0;
275 s->d1->change_cipher_spec_ok = 0;
277 * Should have been reset by ssl3_get_finished, too.
279 s->s3->change_cipher_spec = 0;
282 #ifndef OPENSSL_NO_SCTP
283 case DTLS1_SCTP_ST_CR_READ_SOCK:
285 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
286 s->s3->in_read_app_data = 2;
287 s->rwstate = SSL_READING;
288 BIO_clear_retry_flags(SSL_get_rbio(s));
289 BIO_set_retry_read(SSL_get_rbio(s));
294 s->state = s->s3->tmp.next_state;
297 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
298 /* read app data until dry event */
300 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
305 s->s3->in_read_app_data = 2;
306 s->rwstate = SSL_READING;
307 BIO_clear_retry_flags(SSL_get_rbio(s));
308 BIO_set_retry_read(SSL_get_rbio(s));
313 s->state = s->d1->next_state;
317 case SSL3_ST_CW_CLNT_HELLO_A:
318 case SSL3_ST_CW_CLNT_HELLO_B:
322 /* every DTLS ClientHello resets Finished MAC */
323 ssl3_init_finished_mac(s);
325 dtls1_start_timer(s);
326 ret = ssl3_client_hello(s);
330 if (s->d1->send_cookie) {
331 s->state = SSL3_ST_CW_FLUSH;
332 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
334 s->state = SSL3_ST_CR_SRVR_HELLO_A;
338 #ifndef OPENSSL_NO_SCTP
339 /* Disable buffering for SCTP */
340 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
343 * turn on buffering for the next lot of output
345 if (s->bbio != s->wbio)
346 s->wbio = BIO_push(s->bbio, s->wbio);
347 #ifndef OPENSSL_NO_SCTP
353 case SSL3_ST_CR_SRVR_HELLO_A:
354 case SSL3_ST_CR_SRVR_HELLO_B:
355 ret = ssl3_get_server_hello(s);
360 #ifndef OPENSSL_NO_SCTP
362 * Add new shared key for SCTP-Auth, will be ignored if
365 snprintf((char *)labelbuffer,
366 sizeof(DTLS1_SCTP_AUTH_LABEL),
367 DTLS1_SCTP_AUTH_LABEL);
369 SSL_export_keying_material(s, sctpauthkey,
372 sizeof(labelbuffer), NULL, 0,
375 BIO_ctrl(SSL_get_wbio(s),
376 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
377 sizeof(sctpauthkey), sctpauthkey);
380 s->state = SSL3_ST_CR_FINISHED_A;
382 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
387 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
388 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
390 ret = dtls1_get_hello_verify(s);
394 if (s->d1->send_cookie) /* start again, with a cookie */
395 s->state = SSL3_ST_CW_CLNT_HELLO_A;
397 s->state = SSL3_ST_CR_CERT_A;
401 case SSL3_ST_CR_CERT_A:
402 case SSL3_ST_CR_CERT_B:
403 /* Check if it is anon DH or PSK */
404 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
405 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
406 ret = ssl3_get_server_certificate(s);
409 #ifndef OPENSSL_NO_TLSEXT
410 if (s->tlsext_status_expected)
411 s->state = SSL3_ST_CR_CERT_STATUS_A;
413 s->state = SSL3_ST_CR_KEY_EXCH_A;
416 s->state = SSL3_ST_CR_KEY_EXCH_A;
422 s->state = SSL3_ST_CR_KEY_EXCH_A;
427 case SSL3_ST_CR_KEY_EXCH_A:
428 case SSL3_ST_CR_KEY_EXCH_B:
429 ret = ssl3_get_key_exchange(s);
432 s->state = SSL3_ST_CR_CERT_REQ_A;
436 * at this point we check that we have the required stuff from
439 if (!ssl3_check_cert_and_algorithm(s)) {
441 s->state = SSL_ST_ERR;
446 case SSL3_ST_CR_CERT_REQ_A:
447 case SSL3_ST_CR_CERT_REQ_B:
448 ret = ssl3_get_certificate_request(s);
451 s->state = SSL3_ST_CR_SRVR_DONE_A;
455 case SSL3_ST_CR_SRVR_DONE_A:
456 case SSL3_ST_CR_SRVR_DONE_B:
457 ret = ssl3_get_server_done(s);
461 if (s->s3->tmp.cert_req)
462 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
464 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
467 #ifndef OPENSSL_NO_SCTP
468 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
469 state == SSL_ST_RENEGOTIATE)
470 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
473 s->state = s->s3->tmp.next_state;
476 case SSL3_ST_CW_CERT_A:
477 case SSL3_ST_CW_CERT_B:
478 case SSL3_ST_CW_CERT_C:
479 case SSL3_ST_CW_CERT_D:
480 dtls1_start_timer(s);
481 ret = ssl3_send_client_certificate(s);
484 s->state = SSL3_ST_CW_KEY_EXCH_A;
488 case SSL3_ST_CW_KEY_EXCH_A:
489 case SSL3_ST_CW_KEY_EXCH_B:
490 dtls1_start_timer(s);
491 ret = ssl3_send_client_key_exchange(s);
495 #ifndef OPENSSL_NO_SCTP
497 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
500 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
501 DTLS1_SCTP_AUTH_LABEL);
503 SSL_export_keying_material(s, sctpauthkey,
504 sizeof(sctpauthkey), labelbuffer,
505 sizeof(labelbuffer), NULL, 0, 0);
507 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
508 sizeof(sctpauthkey), sctpauthkey);
512 * EAY EAY EAY need to check for DH fix cert sent back
515 * For TLS, cert_req is set to 2, so a cert chain of nothing is
516 * sent, but no verify packet is sent
518 if (s->s3->tmp.cert_req == 1) {
519 s->state = SSL3_ST_CW_CERT_VRFY_A;
521 #ifndef OPENSSL_NO_SCTP
522 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
523 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
524 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
527 s->state = SSL3_ST_CW_CHANGE_A;
533 case SSL3_ST_CW_CERT_VRFY_A:
534 case SSL3_ST_CW_CERT_VRFY_B:
535 dtls1_start_timer(s);
536 ret = ssl3_send_client_verify(s);
539 #ifndef OPENSSL_NO_SCTP
540 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
541 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
542 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
545 s->state = SSL3_ST_CW_CHANGE_A;
549 case SSL3_ST_CW_CHANGE_A:
550 case SSL3_ST_CW_CHANGE_B:
552 dtls1_start_timer(s);
553 ret = dtls1_send_change_cipher_spec(s,
555 SSL3_ST_CW_CHANGE_B);
559 s->state = SSL3_ST_CW_FINISHED_A;
562 s->session->cipher = s->s3->tmp.new_cipher;
563 #ifdef OPENSSL_NO_COMP
564 s->session->compress_meth = 0;
566 if (s->s3->tmp.new_compression == NULL)
567 s->session->compress_meth = 0;
569 s->session->compress_meth = s->s3->tmp.new_compression->id;
571 if (!s->method->ssl3_enc->setup_key_block(s)) {
573 s->state = SSL_ST_ERR;
577 if (!s->method->ssl3_enc->change_cipher_state(s,
578 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
581 s->state = SSL_ST_ERR;
584 #ifndef OPENSSL_NO_SCTP
587 * Change to new shared key of SCTP-Auth, will be ignored if
590 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
595 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
598 case SSL3_ST_CW_FINISHED_A:
599 case SSL3_ST_CW_FINISHED_B:
601 dtls1_start_timer(s);
602 ret = ssl3_send_finished(s,
603 SSL3_ST_CW_FINISHED_A,
604 SSL3_ST_CW_FINISHED_B,
606 ssl3_enc->client_finished_label,
608 ssl3_enc->client_finished_label_len);
611 s->state = SSL3_ST_CW_FLUSH;
614 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
616 s->s3->tmp.next_state = SSL_ST_OK;
617 #ifndef OPENSSL_NO_SCTP
618 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
619 s->d1->next_state = s->s3->tmp.next_state;
620 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
623 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
624 s->state = SSL_ST_OK;
625 #ifndef OPENSSL_NO_SCTP
626 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
627 s->d1->next_state = SSL_ST_OK;
628 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
631 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
632 s->s3->delay_buf_pop_ret = 0;
635 #ifndef OPENSSL_NO_SCTP
637 * Change to new shared key of SCTP-Auth, will be ignored if
640 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
644 #ifndef OPENSSL_NO_TLSEXT
646 * Allow NewSessionTicket if ticket expected
648 if (s->tlsext_ticket_expected)
649 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
653 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
658 #ifndef OPENSSL_NO_TLSEXT
659 case SSL3_ST_CR_SESSION_TICKET_A:
660 case SSL3_ST_CR_SESSION_TICKET_B:
661 ret = ssl3_get_new_session_ticket(s);
664 s->state = SSL3_ST_CR_FINISHED_A;
668 case SSL3_ST_CR_CERT_STATUS_A:
669 case SSL3_ST_CR_CERT_STATUS_B:
670 ret = ssl3_get_cert_status(s);
673 s->state = SSL3_ST_CR_KEY_EXCH_A;
678 case SSL3_ST_CR_FINISHED_A:
679 case SSL3_ST_CR_FINISHED_B:
680 s->d1->change_cipher_spec_ok = 1;
681 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
682 SSL3_ST_CR_FINISHED_B);
688 s->state = SSL3_ST_CW_CHANGE_A;
690 s->state = SSL_ST_OK;
692 #ifndef OPENSSL_NO_SCTP
693 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
694 state == SSL_ST_RENEGOTIATE) {
695 s->d1->next_state = s->state;
696 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
703 case SSL3_ST_CW_FLUSH:
704 s->rwstate = SSL_WRITING;
705 if (BIO_flush(s->wbio) <= 0) {
707 * If the write error was fatal, stop trying
709 if (!BIO_should_retry(s->wbio)) {
710 s->rwstate = SSL_NOTHING;
711 s->state = s->s3->tmp.next_state;
717 s->rwstate = SSL_NOTHING;
718 s->state = s->s3->tmp.next_state;
722 /* clean a few things up */
723 ssl3_cleanup_key_block(s);
726 if (s->init_buf != NULL) {
727 BUF_MEM_free(s->init_buf);
733 * If we are not 'joining' the last two packets, remove the
736 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
737 ssl_free_wbio_buffer(s);
738 /* else do it later in ssl3_write */
744 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
746 s->ctx->stats.sess_hit++;
750 s->handshake_func = dtls1_connect;
751 s->ctx->stats.sess_connect_good++;
754 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
756 /* done with handshaking */
757 s->d1->handshake_read_seq = 0;
758 s->d1->next_handshake_write_seq = 0;
764 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
770 /* did we do anything */
771 if (!s->s3->tmp.reuse_message && !skip) {
773 if ((ret = BIO_flush(s->wbio)) <= 0)
777 if ((cb != NULL) && (s->state != state)) {
778 new_state = s->state;
780 cb(s, SSL_CB_CONNECT_LOOP, 1);
781 s->state = new_state;
789 #ifndef OPENSSL_NO_SCTP
791 * Notify SCTP BIO socket to leave handshake mode and allow stream
792 * identifier other than 0. Will be ignored if no SCTP is used.
794 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
795 s->in_handshake, NULL);
801 cb(s, SSL_CB_CONNECT_EXIT, ret);
805 static int dtls1_get_hello_verify(SSL *s)
809 unsigned int cookie_len;
812 n = s->method->ssl_get_message(s,
813 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
814 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
815 -1, s->max_cert_list, &ok);
821 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
822 s->d1->send_cookie = 0;
823 s->s3->tmp.reuse_message = 1;
827 data = (unsigned char *)s->init_msg;
829 if (s->method->version != DTLS_ANY_VERSION &&
830 ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))))
832 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
833 s->version = (s->version & 0xff00) | data[1];
834 al = SSL_AD_PROTOCOL_VERSION;
840 cookie_len = *(data++);
841 if (cookie_len > sizeof(s->d1->cookie)) {
842 al = SSL_AD_ILLEGAL_PARAMETER;
846 memcpy(s->d1->cookie, data, cookie_len);
847 s->d1->cookie_len = cookie_len;
849 s->d1->send_cookie = 1;
853 ssl3_send_alert(s, SSL3_AL_FATAL, al);
854 s->state = SSL_ST_ERR;