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/md5.h>
123 #include <openssl/bn.h>
124 #ifndef OPENSSL_NO_DH
125 # include <openssl/dh.h>
128 static const SSL_METHOD *dtls1_get_client_method(int ver);
129 static int dtls1_get_hello_verify(SSL *s);
131 static const SSL_METHOD *dtls1_get_client_method(int ver)
133 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
134 return (DTLSv1_client_method());
135 else if (ver == DTLS1_2_VERSION)
136 return (DTLSv1_2_client_method());
141 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
142 DTLSv1_client_method,
143 ssl_undefined_function,
145 dtls1_get_client_method, DTLSv1_enc_data)
147 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
148 DTLSv1_2_client_method,
149 ssl_undefined_function,
151 dtls1_get_client_method, DTLSv1_2_enc_data)
153 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
155 ssl_undefined_function,
157 dtls1_get_client_method, DTLSv1_2_enc_data)
159 int dtls1_connect(SSL *s)
162 unsigned long Time = (unsigned long)time(NULL);
163 void (*cb) (const SSL *ssl, int type, int val) = NULL;
165 int new_state, state, skip = 0;
166 #ifndef OPENSSL_NO_SCTP
167 unsigned char sctpauthkey[64];
168 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
171 RAND_add(&Time, sizeof(Time), 0);
175 if (s->info_callback != NULL)
176 cb = s->info_callback;
177 else if (s->ctx->info_callback != NULL)
178 cb = s->ctx->info_callback;
181 if (!SSL_in_init(s) || SSL_in_before(s)) {
186 #ifndef OPENSSL_NO_SCTP
188 * Notify SCTP BIO socket to enter handshake mode and prevent stream
189 * identifier other than 0. Will be ignored if no SCTP is used.
191 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
192 s->in_handshake, NULL);
195 #ifndef OPENSSL_NO_HEARTBEATS
197 * If we're awaiting a HeartbeatResponse, pretend we already got and
198 * don't await it anymore, because Heartbeats don't make sense during
201 if (s->tlsext_hb_pending) {
203 s->tlsext_hb_pending = 0;
212 case SSL_ST_RENEGOTIATE:
214 s->state = SSL_ST_CONNECT;
215 s->ctx->stats.sess_connect_renegotiate++;
219 case SSL_ST_BEFORE | SSL_ST_CONNECT:
220 case SSL_ST_OK | SSL_ST_CONNECT:
224 cb(s, SSL_CB_HANDSHAKE_START, 1);
226 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
227 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
228 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
230 s->state = SSL_ST_ERR;
234 /* s->version=SSL3_VERSION; */
235 s->type = SSL_ST_CONNECT;
237 if (s->init_buf == NULL) {
238 if ((buf = BUF_MEM_new()) == NULL) {
240 s->state = SSL_ST_ERR;
243 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
245 s->state = SSL_ST_ERR;
252 if (!ssl3_setup_buffers(s)) {
254 s->state = SSL_ST_ERR;
258 /* setup buffing BIO */
259 if (!ssl_init_wbio_buffer(s, 0)) {
261 s->state = SSL_ST_ERR;
265 /* don't push the buffering BIO quite yet */
267 s->state = SSL3_ST_CW_CLNT_HELLO_A;
268 s->ctx->stats.sess_connect++;
270 /* mark client_random uninitialized */
271 memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
272 s->d1->send_cookie = 0;
275 * Should have been reset by ssl3_get_finished, too.
277 s->s3->change_cipher_spec = 0;
280 #ifndef OPENSSL_NO_SCTP
281 case DTLS1_SCTP_ST_CR_READ_SOCK:
283 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
284 s->s3->in_read_app_data = 2;
285 s->rwstate = SSL_READING;
286 BIO_clear_retry_flags(SSL_get_rbio(s));
287 BIO_set_retry_read(SSL_get_rbio(s));
292 s->state = s->s3->tmp.next_state;
295 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
296 /* read app data until dry event */
298 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
303 s->s3->in_read_app_data = 2;
304 s->rwstate = SSL_READING;
305 BIO_clear_retry_flags(SSL_get_rbio(s));
306 BIO_set_retry_read(SSL_get_rbio(s));
311 s->state = s->d1->next_state;
315 case SSL3_ST_CW_CLNT_HELLO_A:
316 case SSL3_ST_CW_CLNT_HELLO_B:
320 /* every DTLS ClientHello resets Finished MAC */
321 ssl3_init_finished_mac(s);
323 dtls1_start_timer(s);
324 ret = ssl3_client_hello(s);
328 if (s->d1->send_cookie) {
329 s->state = SSL3_ST_CW_FLUSH;
330 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
332 s->state = SSL3_ST_CR_SRVR_HELLO_A;
336 #ifndef OPENSSL_NO_SCTP
337 /* Disable buffering for SCTP */
338 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
341 * turn on buffering for the next lot of output
343 if (s->bbio != s->wbio)
344 s->wbio = BIO_push(s->bbio, s->wbio);
345 #ifndef OPENSSL_NO_SCTP
351 case SSL3_ST_CR_SRVR_HELLO_A:
352 case SSL3_ST_CR_SRVR_HELLO_B:
353 ret = ssl3_get_server_hello(s);
358 #ifndef OPENSSL_NO_SCTP
360 * Add new shared key for SCTP-Auth, will be ignored if
363 snprintf((char *)labelbuffer,
364 sizeof(DTLS1_SCTP_AUTH_LABEL),
365 DTLS1_SCTP_AUTH_LABEL);
367 if (SSL_export_keying_material(s, sctpauthkey,
370 sizeof(labelbuffer), NULL, 0,
373 s->state = SSL_ST_ERR;
377 BIO_ctrl(SSL_get_wbio(s),
378 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
379 sizeof(sctpauthkey), sctpauthkey);
382 s->state = SSL3_ST_CR_CHANGE_A;
383 if (s->tlsext_ticket_expected) {
384 /* receive renewed session ticket */
385 s->state = SSL3_ST_CR_SESSION_TICKET_A;
388 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
393 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
394 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
396 ret = dtls1_get_hello_verify(s);
400 if (s->d1->send_cookie) /* start again, with a cookie */
401 s->state = SSL3_ST_CW_CLNT_HELLO_A;
403 s->state = SSL3_ST_CR_CERT_A;
407 case SSL3_ST_CR_CERT_A:
408 case SSL3_ST_CR_CERT_B:
409 /* Check if it is anon DH or PSK */
410 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
411 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
412 ret = ssl3_get_server_certificate(s);
416 if (s->tlsext_status_expected)
417 s->state = SSL3_ST_CR_CERT_STATUS_A;
419 s->state = SSL3_ST_CR_KEY_EXCH_A;
422 s->state = SSL3_ST_CR_KEY_EXCH_A;
428 case SSL3_ST_CR_KEY_EXCH_A:
429 case SSL3_ST_CR_KEY_EXCH_B:
430 ret = ssl3_get_key_exchange(s);
433 s->state = SSL3_ST_CR_CERT_REQ_A;
437 * at this point we check that we have the required stuff from
440 if (!ssl3_check_cert_and_algorithm(s)) {
442 s->state = SSL_ST_ERR;
447 case SSL3_ST_CR_CERT_REQ_A:
448 case SSL3_ST_CR_CERT_REQ_B:
449 ret = ssl3_get_certificate_request(s);
452 s->state = SSL3_ST_CR_SRVR_DONE_A;
456 case SSL3_ST_CR_SRVR_DONE_A:
457 case SSL3_ST_CR_SRVR_DONE_B:
458 ret = ssl3_get_server_done(s);
462 if (s->s3->tmp.cert_req)
463 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
465 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
468 #ifndef OPENSSL_NO_SCTP
469 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
470 state == SSL_ST_RENEGOTIATE)
471 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
474 s->state = s->s3->tmp.next_state;
477 case SSL3_ST_CW_CERT_A:
478 case SSL3_ST_CW_CERT_B:
479 case SSL3_ST_CW_CERT_C:
480 case SSL3_ST_CW_CERT_D:
481 dtls1_start_timer(s);
482 ret = ssl3_send_client_certificate(s);
485 s->state = SSL3_ST_CW_KEY_EXCH_A;
489 case SSL3_ST_CW_KEY_EXCH_A:
490 case SSL3_ST_CW_KEY_EXCH_B:
491 dtls1_start_timer(s);
492 ret = ssl3_send_client_key_exchange(s);
496 #ifndef OPENSSL_NO_SCTP
498 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
501 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
502 DTLS1_SCTP_AUTH_LABEL);
504 if (SSL_export_keying_material(s, sctpauthkey,
505 sizeof(sctpauthkey), labelbuffer,
506 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
508 s->state = SSL_ST_ERR;
512 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
513 sizeof(sctpauthkey), sctpauthkey);
517 * EAY EAY EAY need to check for DH fix cert sent back
520 * For TLS, cert_req is set to 2, so a cert chain of nothing is
521 * sent, but no verify packet is sent
523 if (s->s3->tmp.cert_req == 1) {
524 s->state = SSL3_ST_CW_CERT_VRFY_A;
526 #ifndef OPENSSL_NO_SCTP
527 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
528 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
529 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
532 s->state = SSL3_ST_CW_CHANGE_A;
538 case SSL3_ST_CW_CERT_VRFY_A:
539 case SSL3_ST_CW_CERT_VRFY_B:
540 dtls1_start_timer(s);
541 ret = ssl3_send_client_verify(s);
544 #ifndef OPENSSL_NO_SCTP
545 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
546 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
547 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
550 s->state = SSL3_ST_CW_CHANGE_A;
554 case SSL3_ST_CW_CHANGE_A:
555 case SSL3_ST_CW_CHANGE_B:
557 dtls1_start_timer(s);
558 ret = dtls1_send_change_cipher_spec(s,
560 SSL3_ST_CW_CHANGE_B);
564 s->state = SSL3_ST_CW_FINISHED_A;
567 s->session->cipher = s->s3->tmp.new_cipher;
568 #ifdef OPENSSL_NO_COMP
569 s->session->compress_meth = 0;
571 if (s->s3->tmp.new_compression == NULL)
572 s->session->compress_meth = 0;
574 s->session->compress_meth = s->s3->tmp.new_compression->id;
576 if (!s->method->ssl3_enc->setup_key_block(s)) {
578 s->state = SSL_ST_ERR;
582 if (!s->method->ssl3_enc->change_cipher_state(s,
583 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
586 s->state = SSL_ST_ERR;
589 #ifndef OPENSSL_NO_SCTP
592 * Change to new shared key of SCTP-Auth, will be ignored if
595 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
600 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
603 case SSL3_ST_CW_FINISHED_A:
604 case SSL3_ST_CW_FINISHED_B:
606 dtls1_start_timer(s);
607 ret = ssl3_send_finished(s,
608 SSL3_ST_CW_FINISHED_A,
609 SSL3_ST_CW_FINISHED_B,
611 ssl3_enc->client_finished_label,
613 ssl3_enc->client_finished_label_len);
616 s->state = SSL3_ST_CW_FLUSH;
619 s->s3->tmp.next_state = SSL_ST_OK;
620 #ifndef OPENSSL_NO_SCTP
621 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
622 s->d1->next_state = s->s3->tmp.next_state;
623 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
627 #ifndef OPENSSL_NO_SCTP
629 * Change to new shared key of SCTP-Auth, will be ignored if
632 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
637 * Allow NewSessionTicket if ticket expected
639 if (s->tlsext_ticket_expected)
640 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
642 s->s3->tmp.next_state = SSL3_ST_CR_CHANGE_A;
647 case SSL3_ST_CR_SESSION_TICKET_A:
648 case SSL3_ST_CR_SESSION_TICKET_B:
649 ret = ssl3_get_new_session_ticket(s);
652 s->state = SSL3_ST_CR_CHANGE_A;
656 case SSL3_ST_CR_CERT_STATUS_A:
657 case SSL3_ST_CR_CERT_STATUS_B:
658 ret = ssl3_get_cert_status(s);
661 s->state = SSL3_ST_CR_KEY_EXCH_A;
665 case SSL3_ST_CR_CHANGE_A:
666 case SSL3_ST_CR_CHANGE_B:
667 ret = ssl3_get_change_cipher_spec(s, SSL3_ST_CR_CHANGE_A,
668 SSL3_ST_CR_CHANGE_B);
672 s->state = SSL3_ST_CR_FINISHED_A;
676 case SSL3_ST_CR_FINISHED_A:
677 case SSL3_ST_CR_FINISHED_B:
678 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
679 SSL3_ST_CR_FINISHED_B);
685 s->state = SSL3_ST_CW_CHANGE_A;
687 s->state = SSL_ST_OK;
689 #ifndef OPENSSL_NO_SCTP
690 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
691 state == SSL_ST_RENEGOTIATE) {
692 s->d1->next_state = s->state;
693 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
700 case SSL3_ST_CW_FLUSH:
701 s->rwstate = SSL_WRITING;
702 if (BIO_flush(s->wbio) <= 0) {
704 * If the write error was fatal, stop trying
706 if (!BIO_should_retry(s->wbio)) {
707 s->rwstate = SSL_NOTHING;
708 s->state = s->s3->tmp.next_state;
714 s->rwstate = SSL_NOTHING;
715 s->state = s->s3->tmp.next_state;
719 /* clean a few things up */
720 ssl3_cleanup_key_block(s);
722 /* Remove the buffering */
723 ssl_free_wbio_buffer(s);
729 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
731 s->ctx->stats.sess_hit++;
735 s->handshake_func = dtls1_connect;
736 s->ctx->stats.sess_connect_good++;
739 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
741 /* done with handshaking */
742 s->d1->handshake_read_seq = 0;
743 s->d1->next_handshake_write_seq = 0;
749 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
755 /* did we do anything */
756 if (!s->s3->tmp.reuse_message && !skip) {
758 if ((ret = BIO_flush(s->wbio)) <= 0)
762 if ((cb != NULL) && (s->state != state)) {
763 new_state = s->state;
765 cb(s, SSL_CB_CONNECT_LOOP, 1);
766 s->state = new_state;
774 #ifndef OPENSSL_NO_SCTP
776 * Notify SCTP BIO socket to leave handshake mode and allow stream
777 * identifier other than 0. Will be ignored if no SCTP is used.
779 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
780 s->in_handshake, NULL);
785 cb(s, SSL_CB_CONNECT_EXIT, ret);
789 static int dtls1_get_hello_verify(SSL *s)
793 unsigned int cookie_len;
796 n = s->method->ssl_get_message(s,
797 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
798 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
799 -1, s->max_cert_list, &ok);
805 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
806 s->d1->send_cookie = 0;
807 s->s3->tmp.reuse_message = 1;
811 data = (unsigned char *)s->init_msg;
814 cookie_len = *(data++);
815 if (cookie_len > sizeof(s->d1->cookie)) {
816 al = SSL_AD_ILLEGAL_PARAMETER;
820 memcpy(s->d1->cookie, data, cookie_len);
821 s->d1->cookie_len = cookie_len;
823 s->d1->send_cookie = 1;
827 ssl3_send_alert(s, SSL3_AL_FATAL, al);
828 s->state = SSL_ST_ERR;