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());
140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
142 ssl_undefined_function,
143 dtls1_get_server_method)
145 int dtls1_accept(SSL *s)
148 unsigned long Time=(unsigned long)time(NULL);
149 void (*cb)(const SSL *ssl,int type,int val)=NULL;
152 int new_state,state,skip=0;
154 RAND_add(&Time,sizeof(Time),0);
158 if (s->info_callback != NULL)
160 else if (s->ctx->info_callback != NULL)
161 cb=s->ctx->info_callback;
163 /* init things to blank */
165 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
169 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
179 case SSL_ST_RENEGOTIATE:
181 /* s->state=SSL_ST_ACCEPT; */
185 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
186 case SSL_ST_OK|SSL_ST_ACCEPT:
189 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
191 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
193 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
196 s->type=SSL_ST_ACCEPT;
198 if (s->init_buf == NULL)
200 if ((buf=BUF_MEM_new()) == NULL)
205 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
213 if (!ssl3_setup_buffers(s))
221 if (s->state != SSL_ST_RENEGOTIATE)
223 /* Ok, we now need to push on a buffering BIO so that
224 * the output is sent in a way that TCP likes :-)
226 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
228 ssl3_init_finished_mac(s);
229 s->state=SSL3_ST_SR_CLNT_HELLO_A;
230 s->ctx->stats.sess_accept++;
234 /* s->state == SSL_ST_RENEGOTIATE,
235 * we will just send a HelloRequest */
236 s->ctx->stats.sess_accept_renegotiate++;
237 s->state=SSL3_ST_SW_HELLO_REQ_A;
242 case SSL3_ST_SW_HELLO_REQ_A:
243 case SSL3_ST_SW_HELLO_REQ_B:
246 dtls1_start_timer(s);
247 ret=dtls1_send_hello_request(s);
248 if (ret <= 0) goto end;
249 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
250 s->state=SSL3_ST_SW_FLUSH;
253 ssl3_init_finished_mac(s);
256 case SSL3_ST_SW_HELLO_REQ_C:
260 case SSL3_ST_SR_CLNT_HELLO_A:
261 case SSL3_ST_SR_CLNT_HELLO_B:
262 case SSL3_ST_SR_CLNT_HELLO_C:
265 ret=ssl3_get_client_hello(s);
266 if (ret <= 0) goto end;
269 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
270 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
272 s->state = SSL3_ST_SW_SRVR_HELLO_A;
276 /* If we're just listening, stop here */
277 if (s->d1->listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
281 /* Set expected sequence numbers
282 * to continue the handshake.
284 s->d1->handshake_read_seq = 2;
285 s->d1->handshake_write_seq = 1;
286 s->d1->next_handshake_write_seq = 1;
292 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
293 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
295 dtls1_start_timer(s);
296 ret = dtls1_send_hello_verify_request(s);
297 if ( ret <= 0) goto end;
298 s->state=SSL3_ST_SW_FLUSH;
299 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
301 /* HelloVerifyRequest resets Finished MAC */
302 if (s->version != DTLS1_BAD_VER)
303 ssl3_init_finished_mac(s);
306 case SSL3_ST_SW_SRVR_HELLO_A:
307 case SSL3_ST_SW_SRVR_HELLO_B:
309 dtls1_start_timer(s);
310 ret=dtls1_send_server_hello(s);
311 if (ret <= 0) goto end;
313 #ifndef OPENSSL_NO_TLSEXT
316 if (s->tlsext_ticket_expected)
317 s->state=SSL3_ST_SW_SESSION_TICKET_A;
319 s->state=SSL3_ST_SW_CHANGE_A;
323 s->state=SSL3_ST_SW_CHANGE_A;
326 s->state=SSL3_ST_SW_CERT_A;
330 case SSL3_ST_SW_CERT_A:
331 case SSL3_ST_SW_CERT_B:
332 /* Check if it is anon DH or normal PSK */
333 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
334 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
336 dtls1_start_timer(s);
337 ret=dtls1_send_server_certificate(s);
338 if (ret <= 0) goto end;
339 #ifndef OPENSSL_NO_TLSEXT
340 if (s->tlsext_status_expected)
341 s->state=SSL3_ST_SW_CERT_STATUS_A;
343 s->state=SSL3_ST_SW_KEY_EXCH_A;
348 s->state=SSL3_ST_SW_KEY_EXCH_A;
355 s->state=SSL3_ST_SW_KEY_EXCH_A;
360 case SSL3_ST_SW_KEY_EXCH_A:
361 case SSL3_ST_SW_KEY_EXCH_B:
362 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
364 /* clear this, it may get reset by
365 * send_server_key_exchange */
366 if ((s->options & SSL_OP_EPHEMERAL_RSA)
367 #ifndef OPENSSL_NO_KRB5
368 && !(alg_k & SSL_kKRB5)
369 #endif /* OPENSSL_NO_KRB5 */
371 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
372 * even when forbidden by protocol specs
373 * (handshake may fail as clients are not required to
374 * be able to handle this) */
375 s->s3->tmp.use_rsa_tmp=1;
377 s->s3->tmp.use_rsa_tmp=0;
379 /* only send if a DH key exchange or
380 * RSA but we have a sign only certificate */
381 if (s->s3->tmp.use_rsa_tmp
382 /* PSK: send ServerKeyExchange if PSK identity
383 * hint if provided */
384 #ifndef OPENSSL_NO_PSK
385 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
387 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
388 || (alg_k & SSL_kEECDH)
389 || ((alg_k & SSL_kRSA)
390 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
391 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
392 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
398 dtls1_start_timer(s);
399 ret=dtls1_send_server_key_exchange(s);
400 if (ret <= 0) goto end;
405 s->state=SSL3_ST_SW_CERT_REQ_A;
409 case SSL3_ST_SW_CERT_REQ_A:
410 case SSL3_ST_SW_CERT_REQ_B:
411 if (/* don't request cert unless asked for it: */
412 !(s->verify_mode & SSL_VERIFY_PEER) ||
413 /* if SSL_VERIFY_CLIENT_ONCE is set,
414 * don't request cert during re-negotiation: */
415 ((s->session->peer != NULL) &&
416 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
417 /* never request cert in anonymous ciphersuites
418 * (see section "Certificate request" in SSL 3 drafts
419 * and in RFC 2246): */
420 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
421 /* ... except when the application insists on verification
422 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
423 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
424 /* never request cert in Kerberos ciphersuites */
425 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
426 /* With normal PSK Certificates and
427 * Certificate Requests are omitted */
428 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
430 /* no cert request */
432 s->s3->tmp.cert_request=0;
433 s->state=SSL3_ST_SW_SRVR_DONE_A;
437 s->s3->tmp.cert_request=1;
438 dtls1_start_timer(s);
439 ret=dtls1_send_certificate_request(s);
440 if (ret <= 0) goto end;
441 #ifndef NETSCAPE_HANG_BUG
442 s->state=SSL3_ST_SW_SRVR_DONE_A;
444 s->state=SSL3_ST_SW_FLUSH;
445 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
451 case SSL3_ST_SW_SRVR_DONE_A:
452 case SSL3_ST_SW_SRVR_DONE_B:
453 dtls1_start_timer(s);
454 ret=dtls1_send_server_done(s);
455 if (ret <= 0) goto end;
456 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
457 s->state=SSL3_ST_SW_FLUSH;
461 case SSL3_ST_SW_FLUSH:
462 s->rwstate=SSL_WRITING;
463 if (BIO_flush(s->wbio) <= 0)
468 s->rwstate=SSL_NOTHING;
469 s->state=s->s3->tmp.next_state;
472 case SSL3_ST_SR_CERT_A:
473 case SSL3_ST_SR_CERT_B:
474 /* Check for second client hello (MS SGC) */
475 ret = ssl3_check_client_hello(s);
480 s->state = SSL3_ST_SR_CLNT_HELLO_C;
482 /* could be sent for a DH cert, even if we
483 * have not asked for it :-) */
484 ret=ssl3_get_client_certificate(s);
485 if (ret <= 0) goto end;
488 s->state=SSL3_ST_SR_KEY_EXCH_A;
492 case SSL3_ST_SR_KEY_EXCH_A:
493 case SSL3_ST_SR_KEY_EXCH_B:
494 ret=ssl3_get_client_key_exchange(s);
495 if (ret <= 0) goto end;
497 s->state=SSL3_ST_SR_CERT_VRFY_A;
502 /* For the ECDH ciphersuites when
503 * the client sends its ECDH pub key in
504 * a certificate, the CertificateVerify
505 * message is not sent.
507 s->state=SSL3_ST_SR_FINISHED_A;
512 s->state=SSL3_ST_SR_CERT_VRFY_A;
515 /* We need to get hashes here so if there is
516 * a client cert, it can be verified */
517 s->method->ssl3_enc->cert_verify_mac(s,
519 &(s->s3->tmp.cert_verify_md[0]));
520 s->method->ssl3_enc->cert_verify_mac(s,
522 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
526 case SSL3_ST_SR_CERT_VRFY_A:
527 case SSL3_ST_SR_CERT_VRFY_B:
529 s->d1->change_cipher_spec_ok = 1;
530 /* we should decide if we expected this one */
531 ret=ssl3_get_cert_verify(s);
532 if (ret <= 0) goto end;
535 s->state=SSL3_ST_SR_FINISHED_A;
539 case SSL3_ST_SR_FINISHED_A:
540 case SSL3_ST_SR_FINISHED_B:
541 s->d1->change_cipher_spec_ok = 1;
542 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
543 SSL3_ST_SR_FINISHED_B);
544 if (ret <= 0) goto end;
548 #ifndef OPENSSL_NO_TLSEXT
549 else if (s->tlsext_ticket_expected)
550 s->state=SSL3_ST_SW_SESSION_TICKET_A;
553 s->state=SSL3_ST_SW_CHANGE_A;
557 #ifndef OPENSSL_NO_TLSEXT
558 case SSL3_ST_SW_SESSION_TICKET_A:
559 case SSL3_ST_SW_SESSION_TICKET_B:
560 ret=dtls1_send_newsession_ticket(s);
561 if (ret <= 0) goto end;
562 s->state=SSL3_ST_SW_CHANGE_A;
566 case SSL3_ST_SW_CERT_STATUS_A:
567 case SSL3_ST_SW_CERT_STATUS_B:
568 ret=ssl3_send_cert_status(s);
569 if (ret <= 0) goto end;
570 s->state=SSL3_ST_SW_KEY_EXCH_A;
576 case SSL3_ST_SW_CHANGE_A:
577 case SSL3_ST_SW_CHANGE_B:
579 s->session->cipher=s->s3->tmp.new_cipher;
580 if (!s->method->ssl3_enc->setup_key_block(s))
581 { ret= -1; goto end; }
583 ret=dtls1_send_change_cipher_spec(s,
584 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
586 if (ret <= 0) goto end;
587 s->state=SSL3_ST_SW_FINISHED_A;
590 if (!s->method->ssl3_enc->change_cipher_state(s,
591 SSL3_CHANGE_CIPHER_SERVER_WRITE))
597 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
600 case SSL3_ST_SW_FINISHED_A:
601 case SSL3_ST_SW_FINISHED_B:
602 ret=dtls1_send_finished(s,
603 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
604 s->method->ssl3_enc->server_finished_label,
605 s->method->ssl3_enc->server_finished_label_len);
606 if (ret <= 0) goto end;
607 s->state=SSL3_ST_SW_FLUSH;
609 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
611 s->s3->tmp.next_state=SSL_ST_OK;
616 /* clean a few things up */
617 ssl3_cleanup_key_block(s);
620 BUF_MEM_free(s->init_buf);
624 /* remove buffering on output */
625 ssl_free_wbio_buffer(s);
629 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
631 /* actually not necessarily a 'new' session unless
632 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
637 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
639 s->ctx->stats.sess_accept_good++;
641 s->handshake_func=dtls1_accept;
643 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
648 /* done handshaking, next message is client hello */
649 s->d1->handshake_read_seq = 0;
650 /* next message is server hello */
651 s->d1->handshake_write_seq = 0;
652 s->d1->next_handshake_write_seq = 0;
657 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
663 if (!s->s3->tmp.reuse_message && !skip)
667 if ((ret=BIO_flush(s->wbio)) <= 0)
672 if ((cb != NULL) && (s->state != state))
676 cb(s,SSL_CB_ACCEPT_LOOP,1);
683 /* BIO_flush(s->wbio); */
687 cb(s,SSL_CB_ACCEPT_EXIT,ret);
691 int dtls1_send_hello_request(SSL *s)
695 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
697 p=(unsigned char *)s->init_buf->data;
698 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
700 s->state=SSL3_ST_SW_HELLO_REQ_B;
701 /* number of bytes to write */
702 s->init_num=DTLS1_HM_HEADER_LENGTH;
705 /* no need to buffer this message, since there are no retransmit
709 /* SSL3_ST_SW_HELLO_REQ_B */
710 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
713 int dtls1_send_hello_verify_request(SSL *s)
715 unsigned int msg_len;
716 unsigned char *msg, *buf, *p;
718 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
720 buf = (unsigned char *)s->init_buf->data;
722 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
723 *(p++) = s->version >> 8;
724 *(p++) = s->version & 0xFF;
726 if (s->ctx->app_gen_cookie_cb == NULL ||
727 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
728 &(s->d1->cookie_len)) == 0)
730 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
734 *(p++) = (unsigned char) s->d1->cookie_len;
735 memcpy(p, s->d1->cookie, s->d1->cookie_len);
736 p += s->d1->cookie_len;
739 dtls1_set_message_header(s, buf,
740 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
742 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
743 /* number of bytes to write */
748 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
749 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
752 int dtls1_send_server_hello(SSL *s)
758 unsigned long l,Time;
760 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
762 buf=(unsigned char *)s->init_buf->data;
763 p=s->s3->server_random;
764 Time=(unsigned long)time(NULL); /* Time */
766 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
767 /* Do the message type and length last */
768 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
770 *(p++)=s->version>>8;
771 *(p++)=s->version&0xff;
774 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
777 /* now in theory we have 3 options to sending back the
778 * session id. If it is a re-use, we send back the
779 * old session-id, if it is a new session, we send
780 * back the new session-id or we send back a 0 length
781 * session-id if we want it to be single use.
782 * Currently I will not implement the '0' length session-id
783 * 12-Jan-98 - I'll now support the '0' length stuff.
785 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
786 s->session->session_id_length=0;
788 sl=s->session->session_id_length;
789 if (sl > sizeof s->session->session_id)
791 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
795 memcpy(p,s->session->session_id,sl);
799 if (s->s3->tmp.new_cipher == NULL)
801 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
804 /* put the compression method */
805 #ifdef OPENSSL_NO_COMP
808 if (s->s3->tmp.new_compression == NULL)
811 *(p++)=s->s3->tmp.new_compression->id;
814 #ifndef OPENSSL_NO_TLSEXT
815 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
817 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
826 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
828 s->state=SSL3_ST_SW_SRVR_HELLO_B;
829 /* number of bytes to write */
833 /* buffer the message to handle re-xmits */
834 dtls1_buffer_message(s, 0);
837 /* SSL3_ST_SW_SRVR_HELLO_B */
838 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
841 int dtls1_send_server_done(SSL *s)
845 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
847 p=(unsigned char *)s->init_buf->data;
850 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
852 s->state=SSL3_ST_SW_SRVR_DONE_B;
853 /* number of bytes to write */
854 s->init_num=DTLS1_HM_HEADER_LENGTH;
857 /* buffer the message to handle re-xmits */
858 dtls1_buffer_message(s, 0);
861 /* SSL3_ST_SW_SRVR_DONE_B */
862 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
865 int dtls1_send_server_key_exchange(SSL *s)
867 #ifndef OPENSSL_NO_RSA
871 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
874 #ifndef OPENSSL_NO_DH
877 #ifndef OPENSSL_NO_ECDH
878 EC_KEY *ecdh=NULL, *ecdhp;
879 unsigned char *encodedPoint = NULL;
882 BN_CTX *bn_ctx = NULL;
895 EVP_MD_CTX_init(&md_ctx);
896 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
898 type=s->s3->tmp.new_cipher->algorithm_mkey;
903 r[0]=r[1]=r[2]=r[3]=NULL;
905 #ifndef OPENSSL_NO_RSA
909 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
911 rsa=s->cert->rsa_tmp_cb(s,
912 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
913 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
916 al=SSL_AD_HANDSHAKE_FAILURE;
917 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
925 al=SSL_AD_HANDSHAKE_FAILURE;
926 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
931 s->s3->tmp.use_rsa_tmp=1;
935 #ifndef OPENSSL_NO_DH
939 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
940 dhp=s->cert->dh_tmp_cb(s,
941 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
942 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
945 al=SSL_AD_HANDSHAKE_FAILURE;
946 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
950 if (s->s3->tmp.dh != NULL)
953 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
957 if ((dh=DHparams_dup(dhp)) == NULL)
959 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
964 if ((dhp->pub_key == NULL ||
965 dhp->priv_key == NULL ||
966 (s->options & SSL_OP_SINGLE_DH_USE)))
968 if(!DH_generate_key(dh))
970 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
977 dh->pub_key=BN_dup(dhp->pub_key);
978 dh->priv_key=BN_dup(dhp->priv_key);
979 if ((dh->pub_key == NULL) ||
980 (dh->priv_key == NULL))
982 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
992 #ifndef OPENSSL_NO_ECDH
993 if (type & SSL_kEECDH)
995 const EC_GROUP *group;
997 ecdhp=cert->ecdh_tmp;
998 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1000 ecdhp=s->cert->ecdh_tmp_cb(s,
1001 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1002 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1006 al=SSL_AD_HANDSHAKE_FAILURE;
1007 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1011 if (s->s3->tmp.ecdh != NULL)
1013 EC_KEY_free(s->s3->tmp.ecdh);
1014 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1018 /* Duplicate the ECDH structure. */
1021 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1024 if (!EC_KEY_up_ref(ecdhp))
1026 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1031 s->s3->tmp.ecdh=ecdh;
1032 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1033 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1034 (s->options & SSL_OP_SINGLE_ECDH_USE))
1036 if(!EC_KEY_generate_key(ecdh))
1038 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1043 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1044 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1045 (EC_KEY_get0_private_key(ecdh) == NULL))
1047 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1051 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1052 (EC_GROUP_get_degree(group) > 163))
1054 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1058 /* XXX: For now, we only support ephemeral ECDH
1059 * keys over named (not generic) curves. For
1060 * supported named curves, curve_id is non-zero.
1063 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1066 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1070 /* Encode the public key.
1071 * First check the size of encoding and
1072 * allocate memory accordingly.
1074 encodedlen = EC_POINT_point2oct(group,
1075 EC_KEY_get0_public_key(ecdh),
1076 POINT_CONVERSION_UNCOMPRESSED,
1079 encodedPoint = (unsigned char *)
1080 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1081 bn_ctx = BN_CTX_new();
1082 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1084 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1089 encodedlen = EC_POINT_point2oct(group,
1090 EC_KEY_get0_public_key(ecdh),
1091 POINT_CONVERSION_UNCOMPRESSED,
1092 encodedPoint, encodedlen, bn_ctx);
1094 if (encodedlen == 0)
1096 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1100 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1102 /* XXX: For now, we only support named (not
1103 * generic) curves in ECDH ephemeral key exchanges.
1104 * In this situation, we need four additional bytes
1105 * to encode the entire ServerECDHParams
1110 /* We'll generate the serverKeyExchange message
1111 * explicitly so we can set these to NULLs
1119 #endif /* !OPENSSL_NO_ECDH */
1120 #ifndef OPENSSL_NO_PSK
1121 if (type & SSL_kPSK)
1123 /* reserve size for record length and PSK identity hint*/
1124 n+=2+strlen(s->ctx->psk_identity_hint);
1127 #endif /* !OPENSSL_NO_PSK */
1129 al=SSL_AD_HANDSHAKE_FAILURE;
1130 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1133 for (i=0; r[i] != NULL; i++)
1135 nr[i]=BN_num_bytes(r[i]);
1139 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1140 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1142 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1145 al=SSL_AD_DECODE_ERROR;
1148 kn=EVP_PKEY_size(pkey);
1156 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1158 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1161 d=(unsigned char *)s->init_buf->data;
1162 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1164 for (i=0; r[i] != NULL; i++)
1171 #ifndef OPENSSL_NO_ECDH
1172 if (type & SSL_kEECDH)
1174 /* XXX: For now, we only support named (not generic) curves.
1175 * In this situation, the serverKeyExchange message has:
1176 * [1 byte CurveType], [2 byte CurveName]
1177 * [1 byte length of encoded point], followed by
1178 * the actual encoded point itself
1180 *p = NAMED_CURVE_TYPE;
1188 memcpy((unsigned char*)p,
1189 (unsigned char *)encodedPoint,
1191 OPENSSL_free(encodedPoint);
1196 #ifndef OPENSSL_NO_PSK
1197 if (type & SSL_kPSK)
1199 /* copy PSK identity hint */
1200 s2n(strlen(s->ctx->psk_identity_hint), p);
1201 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1202 p+=strlen(s->ctx->psk_identity_hint);
1209 /* n is the length of the params, they start at
1210 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1212 #ifndef OPENSSL_NO_RSA
1213 if (pkey->type == EVP_PKEY_RSA)
1217 for (num=2; num > 0; num--)
1219 EVP_DigestInit_ex(&md_ctx,(num == 2)
1220 ?s->ctx->md5:s->ctx->sha1, NULL);
1221 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1222 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1223 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1224 EVP_DigestFinal_ex(&md_ctx,q,
1225 (unsigned int *)&i);
1229 if (RSA_sign(NID_md5_sha1, md_buf, j,
1230 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1232 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1240 #if !defined(OPENSSL_NO_DSA)
1241 if (pkey->type == EVP_PKEY_DSA)
1244 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1245 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1246 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1247 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1248 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1249 (unsigned int *)&i,pkey))
1251 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1259 #if !defined(OPENSSL_NO_ECDSA)
1260 if (pkey->type == EVP_PKEY_EC)
1262 /* let's do ECDSA */
1263 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1264 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1265 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1266 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1267 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1268 (unsigned int *)&i,pkey))
1270 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1279 /* Is this error check actually needed? */
1280 al=SSL_AD_HANDSHAKE_FAILURE;
1281 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1286 d = dtls1_set_message_header(s, d,
1287 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1289 /* we should now have things packed up, so lets send
1291 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1294 /* buffer the message to handle re-xmits */
1295 dtls1_buffer_message(s, 0);
1298 s->state = SSL3_ST_SW_KEY_EXCH_B;
1299 EVP_MD_CTX_cleanup(&md_ctx);
1300 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1302 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1304 #ifndef OPENSSL_NO_ECDH
1305 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1306 BN_CTX_free(bn_ctx);
1308 EVP_MD_CTX_cleanup(&md_ctx);
1312 int dtls1_send_certificate_request(SSL *s)
1314 unsigned char *p,*d;
1316 STACK_OF(X509_NAME) *sk=NULL;
1319 unsigned int msg_len;
1321 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1325 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1327 /* get the list of acceptable cert types */
1329 n=ssl3_get_req_cert_type(s,p);
1338 sk=SSL_get_client_CA_list(s);
1342 for (i=0; i<sk_X509_NAME_num(sk); i++)
1344 name=sk_X509_NAME_value(sk,i);
1345 j=i2d_X509_NAME(name,NULL);
1346 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1348 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1351 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1352 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1355 i2d_X509_NAME(name,&p);
1362 i2d_X509_NAME(name,&p);
1363 j-=2; s2n(j,d); j+=2;
1369 /* else no CA names */
1370 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1373 d=(unsigned char *)buf->data;
1374 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1376 s2n(s->d1->handshake_write_seq,d);
1377 s->d1->handshake_write_seq++;
1379 /* we should now have things packed up, so lets send
1382 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1384 #ifdef NETSCAPE_HANG_BUG
1385 /* XXX: what to do about this? */
1386 p=(unsigned char *)s->init_buf->data + s->init_num;
1389 *(p++)=SSL3_MT_SERVER_DONE;
1396 /* XDTLS: set message header ? */
1397 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1398 dtls1_set_message_header(s, (void *)s->init_buf->data,
1399 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1401 /* buffer the message to handle re-xmits */
1402 dtls1_buffer_message(s, 0);
1404 s->state = SSL3_ST_SW_CERT_REQ_B;
1407 /* SSL3_ST_SW_CERT_REQ_B */
1408 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1413 int dtls1_send_server_certificate(SSL *s)
1418 if (s->state == SSL3_ST_SW_CERT_A)
1420 x=ssl_get_server_send_cert(s);
1423 /* VRS: allow null cert if auth == KRB5 */
1424 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1425 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1427 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1432 l=dtls1_output_cert_chain(s,x);
1433 s->state=SSL3_ST_SW_CERT_B;
1437 /* buffer the message to handle re-xmits */
1438 dtls1_buffer_message(s, 0);
1441 /* SSL3_ST_SW_CERT_B */
1442 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1445 #ifndef OPENSSL_NO_TLSEXT
1446 int dtls1_send_newsession_ticket(SSL *s)
1448 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1450 unsigned char *p, *senc, *macstart;
1452 unsigned int hlen, msg_len;
1455 SSL_CTX *tctx = s->initial_ctx;
1456 unsigned char iv[EVP_MAX_IV_LENGTH];
1457 unsigned char key_name[16];
1459 /* get session encoding length */
1460 slen = i2d_SSL_SESSION(s->session, NULL);
1461 /* Some length values are 16 bits, so forget it if session is
1466 /* Grow buffer if need be: the length calculation is as
1467 * follows 12 (DTLS handshake message header) +
1468 * 4 (ticket lifetime hint) + 2 (ticket length) +
1469 * 16 (key name) + max_iv_len (iv length) +
1470 * session_length + max_enc_block_size (max encrypted session
1471 * length) + max_md_size (HMAC).
1473 if (!BUF_MEM_grow(s->init_buf,
1474 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1475 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1477 senc = OPENSSL_malloc(slen);
1481 i2d_SSL_SESSION(s->session, &p);
1483 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1484 EVP_CIPHER_CTX_init(&ctx);
1485 HMAC_CTX_init(&hctx);
1486 /* Initialize HMAC and cipher contexts. If callback present
1487 * it does all the work otherwise use generated values
1490 if (tctx->tlsext_ticket_key_cb)
1492 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1501 RAND_pseudo_bytes(iv, 16);
1502 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1503 tctx->tlsext_tick_aes_key, iv);
1504 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1505 tlsext_tick_md(), NULL);
1506 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1508 l2n(s->session->tlsext_tick_lifetime_hint, p);
1509 /* Skip ticket length for now */
1511 /* Output key name */
1513 memcpy(p, key_name, 16);
1516 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1517 p += EVP_CIPHER_CTX_iv_length(&ctx);
1518 /* Encrypt session data */
1519 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1521 EVP_EncryptFinal(&ctx, p, &len);
1523 EVP_CIPHER_CTX_cleanup(&ctx);
1525 HMAC_Update(&hctx, macstart, p - macstart);
1526 HMAC_Final(&hctx, p, &hlen);
1527 HMAC_CTX_cleanup(&hctx);
1530 /* Now write out lengths: p points to end of data written */
1532 len = p - (unsigned char *)(s->init_buf->data);
1534 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1535 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1537 /* number of bytes to write */
1539 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1543 /* XDTLS: set message header ? */
1544 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1545 dtls1_set_message_header(s, (void *)s->init_buf->data,
1546 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1548 /* buffer the message to handle re-xmits */
1549 dtls1_buffer_message(s, 0);
1552 /* SSL3_ST_SW_SESSION_TICKET_B */
1553 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));