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 if (!ssl3_init_finished_mac(s)) {
325 s->state = SSL_ST_ERR;
330 case SSL3_ST_CW_CLNT_HELLO_B:
331 dtls1_start_timer(s);
332 ret = ssl3_client_hello(s);
336 if (s->d1->send_cookie) {
337 s->state = SSL3_ST_CW_FLUSH;
338 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
340 s->state = SSL3_ST_CR_SRVR_HELLO_A;
344 #ifndef OPENSSL_NO_SCTP
345 /* Disable buffering for SCTP */
346 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
349 * turn on buffering for the next lot of output
351 if (s->bbio != s->wbio)
352 s->wbio = BIO_push(s->bbio, s->wbio);
353 #ifndef OPENSSL_NO_SCTP
359 case SSL3_ST_CR_SRVR_HELLO_A:
360 case SSL3_ST_CR_SRVR_HELLO_B:
361 ret = ssl3_get_server_hello(s);
366 #ifndef OPENSSL_NO_SCTP
368 * Add new shared key for SCTP-Auth, will be ignored if
371 snprintf((char *)labelbuffer,
372 sizeof(DTLS1_SCTP_AUTH_LABEL),
373 DTLS1_SCTP_AUTH_LABEL);
375 if (SSL_export_keying_material(s, sctpauthkey,
378 sizeof(labelbuffer), NULL, 0,
381 s->state = SSL_ST_ERR;
385 BIO_ctrl(SSL_get_wbio(s),
386 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
387 sizeof(sctpauthkey), sctpauthkey);
390 s->state = SSL3_ST_CR_FINISHED_A;
391 if (s->tlsext_ticket_expected) {
392 /* receive renewed session ticket */
393 s->state = SSL3_ST_CR_SESSION_TICKET_A;
396 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
401 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
402 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
404 ret = dtls1_get_hello_verify(s);
408 if (s->d1->send_cookie) /* start again, with a cookie */
409 s->state = SSL3_ST_CW_CLNT_HELLO_A;
411 s->state = SSL3_ST_CR_CERT_A;
415 case SSL3_ST_CR_CERT_A:
416 case SSL3_ST_CR_CERT_B:
417 /* Check if it is anon DH or PSK */
418 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
419 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
420 ret = ssl3_get_server_certificate(s);
423 #ifndef OPENSSL_NO_TLSEXT
424 if (s->tlsext_status_expected)
425 s->state = SSL3_ST_CR_CERT_STATUS_A;
427 s->state = SSL3_ST_CR_KEY_EXCH_A;
430 s->state = SSL3_ST_CR_KEY_EXCH_A;
436 s->state = SSL3_ST_CR_KEY_EXCH_A;
441 case SSL3_ST_CR_KEY_EXCH_A:
442 case SSL3_ST_CR_KEY_EXCH_B:
443 ret = ssl3_get_key_exchange(s);
446 s->state = SSL3_ST_CR_CERT_REQ_A;
450 * at this point we check that we have the required stuff from
453 if (!ssl3_check_cert_and_algorithm(s)) {
455 s->state = SSL_ST_ERR;
460 case SSL3_ST_CR_CERT_REQ_A:
461 case SSL3_ST_CR_CERT_REQ_B:
462 ret = ssl3_get_certificate_request(s);
465 s->state = SSL3_ST_CR_SRVR_DONE_A;
469 case SSL3_ST_CR_SRVR_DONE_A:
470 case SSL3_ST_CR_SRVR_DONE_B:
471 ret = ssl3_get_server_done(s);
475 if (s->s3->tmp.cert_req)
476 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
478 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
481 #ifndef OPENSSL_NO_SCTP
482 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
483 state == SSL_ST_RENEGOTIATE)
484 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
487 s->state = s->s3->tmp.next_state;
490 case SSL3_ST_CW_CERT_A:
491 case SSL3_ST_CW_CERT_B:
492 case SSL3_ST_CW_CERT_C:
493 case SSL3_ST_CW_CERT_D:
494 dtls1_start_timer(s);
495 ret = ssl3_send_client_certificate(s);
498 s->state = SSL3_ST_CW_KEY_EXCH_A;
502 case SSL3_ST_CW_KEY_EXCH_A:
503 case SSL3_ST_CW_KEY_EXCH_B:
504 dtls1_start_timer(s);
505 ret = ssl3_send_client_key_exchange(s);
509 #ifndef OPENSSL_NO_SCTP
511 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
514 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
515 DTLS1_SCTP_AUTH_LABEL);
517 if (SSL_export_keying_material(s, sctpauthkey,
518 sizeof(sctpauthkey), labelbuffer,
519 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
521 s->state = SSL_ST_ERR;
525 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
526 sizeof(sctpauthkey), sctpauthkey);
530 * EAY EAY EAY need to check for DH fix cert sent back
533 * For TLS, cert_req is set to 2, so a cert chain of nothing is
534 * sent, but no verify packet is sent
536 if (s->s3->tmp.cert_req == 1) {
537 s->state = SSL3_ST_CW_CERT_VRFY_A;
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;
551 case SSL3_ST_CW_CERT_VRFY_A:
552 case SSL3_ST_CW_CERT_VRFY_B:
553 dtls1_start_timer(s);
554 ret = ssl3_send_client_verify(s);
557 #ifndef OPENSSL_NO_SCTP
558 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
559 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
560 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
563 s->state = SSL3_ST_CW_CHANGE_A;
567 case SSL3_ST_CW_CHANGE_A:
568 case SSL3_ST_CW_CHANGE_B:
570 dtls1_start_timer(s);
571 ret = dtls1_send_change_cipher_spec(s,
573 SSL3_ST_CW_CHANGE_B);
577 s->state = SSL3_ST_CW_FINISHED_A;
580 s->session->cipher = s->s3->tmp.new_cipher;
581 #ifdef OPENSSL_NO_COMP
582 s->session->compress_meth = 0;
584 if (s->s3->tmp.new_compression == NULL)
585 s->session->compress_meth = 0;
587 s->session->compress_meth = s->s3->tmp.new_compression->id;
589 if (!s->method->ssl3_enc->setup_key_block(s)) {
591 s->state = SSL_ST_ERR;
595 if (!s->method->ssl3_enc->change_cipher_state(s,
596 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
599 s->state = SSL_ST_ERR;
602 #ifndef OPENSSL_NO_SCTP
605 * Change to new shared key of SCTP-Auth, will be ignored if
608 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
613 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
616 case SSL3_ST_CW_FINISHED_A:
617 case SSL3_ST_CW_FINISHED_B:
619 dtls1_start_timer(s);
620 ret = ssl3_send_finished(s,
621 SSL3_ST_CW_FINISHED_A,
622 SSL3_ST_CW_FINISHED_B,
624 ssl3_enc->client_finished_label,
626 ssl3_enc->client_finished_label_len);
629 s->state = SSL3_ST_CW_FLUSH;
632 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
634 s->s3->tmp.next_state = SSL_ST_OK;
635 #ifndef OPENSSL_NO_SCTP
636 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
637 s->d1->next_state = s->s3->tmp.next_state;
638 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
641 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
642 s->state = SSL_ST_OK;
643 #ifndef OPENSSL_NO_SCTP
644 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
645 s->d1->next_state = SSL_ST_OK;
646 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
649 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
650 s->s3->delay_buf_pop_ret = 0;
653 #ifndef OPENSSL_NO_SCTP
655 * Change to new shared key of SCTP-Auth, will be ignored if
658 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
662 #ifndef OPENSSL_NO_TLSEXT
664 * Allow NewSessionTicket if ticket expected
666 if (s->tlsext_ticket_expected)
667 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
671 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
676 #ifndef OPENSSL_NO_TLSEXT
677 case SSL3_ST_CR_SESSION_TICKET_A:
678 case SSL3_ST_CR_SESSION_TICKET_B:
679 ret = ssl3_get_new_session_ticket(s);
682 s->state = SSL3_ST_CR_FINISHED_A;
686 case SSL3_ST_CR_CERT_STATUS_A:
687 case SSL3_ST_CR_CERT_STATUS_B:
688 ret = ssl3_get_cert_status(s);
691 s->state = SSL3_ST_CR_KEY_EXCH_A;
696 case SSL3_ST_CR_FINISHED_A:
697 case SSL3_ST_CR_FINISHED_B:
698 s->d1->change_cipher_spec_ok = 1;
699 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
700 SSL3_ST_CR_FINISHED_B);
706 s->state = SSL3_ST_CW_CHANGE_A;
708 s->state = SSL_ST_OK;
710 #ifndef OPENSSL_NO_SCTP
711 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
712 state == SSL_ST_RENEGOTIATE) {
713 s->d1->next_state = s->state;
714 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
721 case SSL3_ST_CW_FLUSH:
722 s->rwstate = SSL_WRITING;
723 if (BIO_flush(s->wbio) <= 0) {
725 * If the write error was fatal, stop trying
727 if (!BIO_should_retry(s->wbio)) {
728 s->rwstate = SSL_NOTHING;
729 s->state = s->s3->tmp.next_state;
735 s->rwstate = SSL_NOTHING;
736 s->state = s->s3->tmp.next_state;
740 /* clean a few things up */
741 ssl3_cleanup_key_block(s);
744 if (s->init_buf != NULL) {
745 BUF_MEM_free(s->init_buf);
751 * If we are not 'joining' the last two packets, remove the
754 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
755 ssl_free_wbio_buffer(s);
756 /* else do it later in ssl3_write */
762 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
764 s->ctx->stats.sess_hit++;
768 s->handshake_func = dtls1_connect;
769 s->ctx->stats.sess_connect_good++;
772 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
774 /* done with handshaking */
775 s->d1->handshake_read_seq = 0;
776 s->d1->next_handshake_write_seq = 0;
777 dtls1_clear_received_buffer(s);
783 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
789 /* did we do anything */
790 if (!s->s3->tmp.reuse_message && !skip) {
792 if ((ret = BIO_flush(s->wbio)) <= 0)
796 if ((cb != NULL) && (s->state != state)) {
797 new_state = s->state;
799 cb(s, SSL_CB_CONNECT_LOOP, 1);
800 s->state = new_state;
808 #ifndef OPENSSL_NO_SCTP
810 * Notify SCTP BIO socket to leave handshake mode and allow stream
811 * identifier other than 0. Will be ignored if no SCTP is used.
813 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
814 s->in_handshake, NULL);
820 cb(s, SSL_CB_CONNECT_EXIT, ret);
824 static int dtls1_get_hello_verify(SSL *s)
828 unsigned int cookie_len;
831 n = s->method->ssl_get_message(s,
832 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
833 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
834 -1, s->max_cert_list, &ok);
840 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
841 s->d1->send_cookie = 0;
842 s->s3->tmp.reuse_message = 1;
846 data = (unsigned char *)s->init_msg;
848 if (s->method->version != DTLS_ANY_VERSION &&
849 ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))))
851 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
852 s->version = (s->version & 0xff00) | data[1];
853 al = SSL_AD_PROTOCOL_VERSION;
859 cookie_len = *(data++);
860 if (cookie_len > sizeof(s->d1->cookie)) {
861 al = SSL_AD_ILLEGAL_PARAMETER;
865 memcpy(s->d1->cookie, data, cookie_len);
866 s->d1->cookie_len = cookie_len;
868 s->d1->send_cookie = 1;
872 ssl3_send_alert(s, SSL3_AL_FATAL, al);
873 s->state = SSL_ST_ERR;