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;
155 RAND_add(&Time,sizeof(Time),0);
159 if (s->info_callback != NULL)
161 else if (s->ctx->info_callback != NULL)
162 cb=s->ctx->info_callback;
164 listen = s->d1->listen;
166 /* init things to blank */
168 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
170 s->d1->listen = listen;
174 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
184 case SSL_ST_RENEGOTIATE:
186 /* s->state=SSL_ST_ACCEPT; */
190 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
191 case SSL_ST_OK|SSL_ST_ACCEPT:
194 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
196 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
198 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
201 s->type=SSL_ST_ACCEPT;
203 if (s->init_buf == NULL)
205 if ((buf=BUF_MEM_new()) == NULL)
210 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
218 if (!ssl3_setup_buffers(s))
226 if (s->state != SSL_ST_RENEGOTIATE)
228 /* Ok, we now need to push on a buffering BIO so that
229 * the output is sent in a way that TCP likes :-)
231 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
233 ssl3_init_finished_mac(s);
234 s->state=SSL3_ST_SR_CLNT_HELLO_A;
235 s->ctx->stats.sess_accept++;
239 /* s->state == SSL_ST_RENEGOTIATE,
240 * we will just send a HelloRequest */
241 s->ctx->stats.sess_accept_renegotiate++;
242 s->state=SSL3_ST_SW_HELLO_REQ_A;
247 case SSL3_ST_SW_HELLO_REQ_A:
248 case SSL3_ST_SW_HELLO_REQ_B:
251 dtls1_start_timer(s);
252 ret=dtls1_send_hello_request(s);
253 if (ret <= 0) goto end;
254 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
255 s->state=SSL3_ST_SW_FLUSH;
258 ssl3_init_finished_mac(s);
261 case SSL3_ST_SW_HELLO_REQ_C:
265 case SSL3_ST_SR_CLNT_HELLO_A:
266 case SSL3_ST_SR_CLNT_HELLO_B:
267 case SSL3_ST_SR_CLNT_HELLO_C:
270 ret=ssl3_get_client_hello(s);
271 if (ret <= 0) goto end;
274 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
275 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
277 s->state = SSL3_ST_SW_SRVR_HELLO_A;
281 /* Reflect ClientHello sequence to remain stateless while listening */
284 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
287 /* If we're just listening, stop here */
288 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
292 /* Set expected sequence numbers
293 * to continue the handshake.
295 s->d1->handshake_read_seq = 2;
296 s->d1->handshake_write_seq = 1;
297 s->d1->next_handshake_write_seq = 1;
303 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
304 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
306 ret = dtls1_send_hello_verify_request(s);
307 if ( ret <= 0) goto end;
308 s->state=SSL3_ST_SW_FLUSH;
309 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
311 /* HelloVerifyRequest resets Finished MAC */
312 if (s->version != DTLS1_BAD_VER)
313 ssl3_init_finished_mac(s);
316 case SSL3_ST_SW_SRVR_HELLO_A:
317 case SSL3_ST_SW_SRVR_HELLO_B:
319 dtls1_start_timer(s);
320 ret=dtls1_send_server_hello(s);
321 if (ret <= 0) goto end;
323 #ifndef OPENSSL_NO_TLSEXT
326 if (s->tlsext_ticket_expected)
327 s->state=SSL3_ST_SW_SESSION_TICKET_A;
329 s->state=SSL3_ST_SW_CHANGE_A;
333 s->state=SSL3_ST_SW_CHANGE_A;
336 s->state=SSL3_ST_SW_CERT_A;
340 case SSL3_ST_SW_CERT_A:
341 case SSL3_ST_SW_CERT_B:
342 /* Check if it is anon DH or normal PSK */
343 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
344 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
346 dtls1_start_timer(s);
347 ret=dtls1_send_server_certificate(s);
348 if (ret <= 0) goto end;
349 #ifndef OPENSSL_NO_TLSEXT
350 if (s->tlsext_status_expected)
351 s->state=SSL3_ST_SW_CERT_STATUS_A;
353 s->state=SSL3_ST_SW_KEY_EXCH_A;
358 s->state=SSL3_ST_SW_KEY_EXCH_A;
365 s->state=SSL3_ST_SW_KEY_EXCH_A;
370 case SSL3_ST_SW_KEY_EXCH_A:
371 case SSL3_ST_SW_KEY_EXCH_B:
372 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
374 /* clear this, it may get reset by
375 * send_server_key_exchange */
376 if ((s->options & SSL_OP_EPHEMERAL_RSA)
377 #ifndef OPENSSL_NO_KRB5
378 && !(alg_k & SSL_kKRB5)
379 #endif /* OPENSSL_NO_KRB5 */
381 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
382 * even when forbidden by protocol specs
383 * (handshake may fail as clients are not required to
384 * be able to handle this) */
385 s->s3->tmp.use_rsa_tmp=1;
387 s->s3->tmp.use_rsa_tmp=0;
389 /* only send if a DH key exchange or
390 * RSA but we have a sign only certificate */
391 if (s->s3->tmp.use_rsa_tmp
392 /* PSK: send ServerKeyExchange if PSK identity
393 * hint if provided */
394 #ifndef OPENSSL_NO_PSK
395 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
397 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
398 || (alg_k & SSL_kEECDH)
399 || ((alg_k & SSL_kRSA)
400 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
401 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
402 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
408 dtls1_start_timer(s);
409 ret=dtls1_send_server_key_exchange(s);
410 if (ret <= 0) goto end;
415 s->state=SSL3_ST_SW_CERT_REQ_A;
419 case SSL3_ST_SW_CERT_REQ_A:
420 case SSL3_ST_SW_CERT_REQ_B:
421 if (/* don't request cert unless asked for it: */
422 !(s->verify_mode & SSL_VERIFY_PEER) ||
423 /* if SSL_VERIFY_CLIENT_ONCE is set,
424 * don't request cert during re-negotiation: */
425 ((s->session->peer != NULL) &&
426 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
427 /* never request cert in anonymous ciphersuites
428 * (see section "Certificate request" in SSL 3 drafts
429 * and in RFC 2246): */
430 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
431 /* ... except when the application insists on verification
432 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
433 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
434 /* never request cert in Kerberos ciphersuites */
435 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
436 /* With normal PSK Certificates and
437 * Certificate Requests are omitted */
438 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
440 /* no cert request */
442 s->s3->tmp.cert_request=0;
443 s->state=SSL3_ST_SW_SRVR_DONE_A;
447 s->s3->tmp.cert_request=1;
448 dtls1_start_timer(s);
449 ret=dtls1_send_certificate_request(s);
450 if (ret <= 0) goto end;
451 #ifndef NETSCAPE_HANG_BUG
452 s->state=SSL3_ST_SW_SRVR_DONE_A;
454 s->state=SSL3_ST_SW_FLUSH;
455 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
461 case SSL3_ST_SW_SRVR_DONE_A:
462 case SSL3_ST_SW_SRVR_DONE_B:
463 dtls1_start_timer(s);
464 ret=dtls1_send_server_done(s);
465 if (ret <= 0) goto end;
466 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
467 s->state=SSL3_ST_SW_FLUSH;
471 case SSL3_ST_SW_FLUSH:
472 s->rwstate=SSL_WRITING;
473 if (BIO_flush(s->wbio) <= 0)
478 s->rwstate=SSL_NOTHING;
479 s->state=s->s3->tmp.next_state;
482 case SSL3_ST_SR_CERT_A:
483 case SSL3_ST_SR_CERT_B:
484 /* Check for second client hello (MS SGC) */
485 ret = ssl3_check_client_hello(s);
490 s->state = SSL3_ST_SR_CLNT_HELLO_C;
492 /* could be sent for a DH cert, even if we
493 * have not asked for it :-) */
494 ret=ssl3_get_client_certificate(s);
495 if (ret <= 0) goto end;
498 s->state=SSL3_ST_SR_KEY_EXCH_A;
502 case SSL3_ST_SR_KEY_EXCH_A:
503 case SSL3_ST_SR_KEY_EXCH_B:
504 ret=ssl3_get_client_key_exchange(s);
505 if (ret <= 0) goto end;
507 s->state=SSL3_ST_SR_CERT_VRFY_A;
512 /* For the ECDH ciphersuites when
513 * the client sends its ECDH pub key in
514 * a certificate, the CertificateVerify
515 * message is not sent.
517 s->state=SSL3_ST_SR_FINISHED_A;
522 s->state=SSL3_ST_SR_CERT_VRFY_A;
525 /* We need to get hashes here so if there is
526 * a client cert, it can be verified */
527 s->method->ssl3_enc->cert_verify_mac(s,
529 &(s->s3->tmp.cert_verify_md[0]));
530 s->method->ssl3_enc->cert_verify_mac(s,
532 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
536 case SSL3_ST_SR_CERT_VRFY_A:
537 case SSL3_ST_SR_CERT_VRFY_B:
539 s->d1->change_cipher_spec_ok = 1;
540 /* we should decide if we expected this one */
541 ret=ssl3_get_cert_verify(s);
542 if (ret <= 0) goto end;
545 s->state=SSL3_ST_SR_FINISHED_A;
549 case SSL3_ST_SR_FINISHED_A:
550 case SSL3_ST_SR_FINISHED_B:
551 s->d1->change_cipher_spec_ok = 1;
552 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
553 SSL3_ST_SR_FINISHED_B);
554 if (ret <= 0) goto end;
558 #ifndef OPENSSL_NO_TLSEXT
559 else if (s->tlsext_ticket_expected)
560 s->state=SSL3_ST_SW_SESSION_TICKET_A;
563 s->state=SSL3_ST_SW_CHANGE_A;
567 #ifndef OPENSSL_NO_TLSEXT
568 case SSL3_ST_SW_SESSION_TICKET_A:
569 case SSL3_ST_SW_SESSION_TICKET_B:
570 ret=dtls1_send_newsession_ticket(s);
571 if (ret <= 0) goto end;
572 s->state=SSL3_ST_SW_CHANGE_A;
576 case SSL3_ST_SW_CERT_STATUS_A:
577 case SSL3_ST_SW_CERT_STATUS_B:
578 ret=ssl3_send_cert_status(s);
579 if (ret <= 0) goto end;
580 s->state=SSL3_ST_SW_KEY_EXCH_A;
586 case SSL3_ST_SW_CHANGE_A:
587 case SSL3_ST_SW_CHANGE_B:
589 s->session->cipher=s->s3->tmp.new_cipher;
590 if (!s->method->ssl3_enc->setup_key_block(s))
591 { ret= -1; goto end; }
593 ret=dtls1_send_change_cipher_spec(s,
594 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
596 if (ret <= 0) goto end;
597 s->state=SSL3_ST_SW_FINISHED_A;
600 if (!s->method->ssl3_enc->change_cipher_state(s,
601 SSL3_CHANGE_CIPHER_SERVER_WRITE))
607 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
610 case SSL3_ST_SW_FINISHED_A:
611 case SSL3_ST_SW_FINISHED_B:
612 ret=dtls1_send_finished(s,
613 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
614 s->method->ssl3_enc->server_finished_label,
615 s->method->ssl3_enc->server_finished_label_len);
616 if (ret <= 0) goto end;
617 s->state=SSL3_ST_SW_FLUSH;
619 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
621 s->s3->tmp.next_state=SSL_ST_OK;
626 /* clean a few things up */
627 ssl3_cleanup_key_block(s);
630 BUF_MEM_free(s->init_buf);
634 /* remove buffering on output */
635 ssl_free_wbio_buffer(s);
639 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
641 /* actually not necessarily a 'new' session unless
642 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
646 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
648 s->ctx->stats.sess_accept_good++;
650 s->handshake_func=dtls1_accept;
652 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
657 /* done handshaking, next message is client hello */
658 s->d1->handshake_read_seq = 0;
659 /* next message is server hello */
660 s->d1->handshake_write_seq = 0;
661 s->d1->next_handshake_write_seq = 0;
666 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
672 if (!s->s3->tmp.reuse_message && !skip)
676 if ((ret=BIO_flush(s->wbio)) <= 0)
681 if ((cb != NULL) && (s->state != state))
685 cb(s,SSL_CB_ACCEPT_LOOP,1);
692 /* BIO_flush(s->wbio); */
696 cb(s,SSL_CB_ACCEPT_EXIT,ret);
700 int dtls1_send_hello_request(SSL *s)
704 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
706 p=(unsigned char *)s->init_buf->data;
707 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
709 s->state=SSL3_ST_SW_HELLO_REQ_B;
710 /* number of bytes to write */
711 s->init_num=DTLS1_HM_HEADER_LENGTH;
714 /* no need to buffer this message, since there are no retransmit
718 /* SSL3_ST_SW_HELLO_REQ_B */
719 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
722 int dtls1_send_hello_verify_request(SSL *s)
724 unsigned int msg_len;
725 unsigned char *msg, *buf, *p;
727 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
729 buf = (unsigned char *)s->init_buf->data;
731 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
732 *(p++) = s->version >> 8;
733 *(p++) = s->version & 0xFF;
735 if (s->ctx->app_gen_cookie_cb == NULL ||
736 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
737 &(s->d1->cookie_len)) == 0)
739 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
743 *(p++) = (unsigned char) s->d1->cookie_len;
744 memcpy(p, s->d1->cookie, s->d1->cookie_len);
745 p += s->d1->cookie_len;
748 dtls1_set_message_header(s, buf,
749 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
751 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
752 /* number of bytes to write */
757 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
758 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
761 int dtls1_send_server_hello(SSL *s)
767 unsigned long l,Time;
769 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
771 buf=(unsigned char *)s->init_buf->data;
772 p=s->s3->server_random;
773 Time=(unsigned long)time(NULL); /* Time */
775 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
776 /* Do the message type and length last */
777 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
779 *(p++)=s->version>>8;
780 *(p++)=s->version&0xff;
783 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
786 /* now in theory we have 3 options to sending back the
787 * session id. If it is a re-use, we send back the
788 * old session-id, if it is a new session, we send
789 * back the new session-id or we send back a 0 length
790 * session-id if we want it to be single use.
791 * Currently I will not implement the '0' length session-id
792 * 12-Jan-98 - I'll now support the '0' length stuff.
794 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
795 s->session->session_id_length=0;
797 sl=s->session->session_id_length;
798 if (sl > sizeof s->session->session_id)
800 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
804 memcpy(p,s->session->session_id,sl);
808 if (s->s3->tmp.new_cipher == NULL)
810 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
813 /* put the compression method */
814 #ifdef OPENSSL_NO_COMP
817 if (s->s3->tmp.new_compression == NULL)
820 *(p++)=s->s3->tmp.new_compression->id;
823 #ifndef OPENSSL_NO_TLSEXT
824 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
826 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
835 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
837 s->state=SSL3_ST_SW_SRVR_HELLO_B;
838 /* number of bytes to write */
842 /* buffer the message to handle re-xmits */
843 dtls1_buffer_message(s, 0);
846 /* SSL3_ST_SW_SRVR_HELLO_B */
847 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
850 int dtls1_send_server_done(SSL *s)
854 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
856 p=(unsigned char *)s->init_buf->data;
859 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
861 s->state=SSL3_ST_SW_SRVR_DONE_B;
862 /* number of bytes to write */
863 s->init_num=DTLS1_HM_HEADER_LENGTH;
866 /* buffer the message to handle re-xmits */
867 dtls1_buffer_message(s, 0);
870 /* SSL3_ST_SW_SRVR_DONE_B */
871 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
874 int dtls1_send_server_key_exchange(SSL *s)
876 #ifndef OPENSSL_NO_RSA
880 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
883 #ifndef OPENSSL_NO_DH
886 #ifndef OPENSSL_NO_ECDH
887 EC_KEY *ecdh=NULL, *ecdhp;
888 unsigned char *encodedPoint = NULL;
891 BN_CTX *bn_ctx = NULL;
904 EVP_MD_CTX_init(&md_ctx);
905 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
907 type=s->s3->tmp.new_cipher->algorithm_mkey;
912 r[0]=r[1]=r[2]=r[3]=NULL;
914 #ifndef OPENSSL_NO_RSA
918 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
920 rsa=s->cert->rsa_tmp_cb(s,
921 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
922 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
925 al=SSL_AD_HANDSHAKE_FAILURE;
926 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
934 al=SSL_AD_HANDSHAKE_FAILURE;
935 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
940 s->s3->tmp.use_rsa_tmp=1;
944 #ifndef OPENSSL_NO_DH
948 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
949 dhp=s->cert->dh_tmp_cb(s,
950 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
951 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
954 al=SSL_AD_HANDSHAKE_FAILURE;
955 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
959 if (s->s3->tmp.dh != NULL)
962 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
966 if ((dh=DHparams_dup(dhp)) == NULL)
968 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
973 if ((dhp->pub_key == NULL ||
974 dhp->priv_key == NULL ||
975 (s->options & SSL_OP_SINGLE_DH_USE)))
977 if(!DH_generate_key(dh))
979 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
986 dh->pub_key=BN_dup(dhp->pub_key);
987 dh->priv_key=BN_dup(dhp->priv_key);
988 if ((dh->pub_key == NULL) ||
989 (dh->priv_key == NULL))
991 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1001 #ifndef OPENSSL_NO_ECDH
1002 if (type & SSL_kEECDH)
1004 const EC_GROUP *group;
1006 ecdhp=cert->ecdh_tmp;
1007 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1009 ecdhp=s->cert->ecdh_tmp_cb(s,
1010 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1011 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1015 al=SSL_AD_HANDSHAKE_FAILURE;
1016 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1020 if (s->s3->tmp.ecdh != NULL)
1022 EC_KEY_free(s->s3->tmp.ecdh);
1023 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1027 /* Duplicate the ECDH structure. */
1030 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1033 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1035 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1039 s->s3->tmp.ecdh=ecdh;
1040 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1041 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1042 (s->options & SSL_OP_SINGLE_ECDH_USE))
1044 if(!EC_KEY_generate_key(ecdh))
1046 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1051 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1052 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1053 (EC_KEY_get0_private_key(ecdh) == NULL))
1055 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1059 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1060 (EC_GROUP_get_degree(group) > 163))
1062 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1066 /* XXX: For now, we only support ephemeral ECDH
1067 * keys over named (not generic) curves. For
1068 * supported named curves, curve_id is non-zero.
1071 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1074 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1078 /* Encode the public key.
1079 * First check the size of encoding and
1080 * allocate memory accordingly.
1082 encodedlen = EC_POINT_point2oct(group,
1083 EC_KEY_get0_public_key(ecdh),
1084 POINT_CONVERSION_UNCOMPRESSED,
1087 encodedPoint = (unsigned char *)
1088 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1089 bn_ctx = BN_CTX_new();
1090 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1092 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1097 encodedlen = EC_POINT_point2oct(group,
1098 EC_KEY_get0_public_key(ecdh),
1099 POINT_CONVERSION_UNCOMPRESSED,
1100 encodedPoint, encodedlen, bn_ctx);
1102 if (encodedlen == 0)
1104 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1108 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1110 /* XXX: For now, we only support named (not
1111 * generic) curves in ECDH ephemeral key exchanges.
1112 * In this situation, we need four additional bytes
1113 * to encode the entire ServerECDHParams
1118 /* We'll generate the serverKeyExchange message
1119 * explicitly so we can set these to NULLs
1127 #endif /* !OPENSSL_NO_ECDH */
1128 #ifndef OPENSSL_NO_PSK
1129 if (type & SSL_kPSK)
1131 /* reserve size for record length and PSK identity hint*/
1132 n+=2+strlen(s->ctx->psk_identity_hint);
1135 #endif /* !OPENSSL_NO_PSK */
1137 al=SSL_AD_HANDSHAKE_FAILURE;
1138 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1141 for (i=0; r[i] != NULL; i++)
1143 nr[i]=BN_num_bytes(r[i]);
1147 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1148 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1150 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1153 al=SSL_AD_DECODE_ERROR;
1156 kn=EVP_PKEY_size(pkey);
1164 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1166 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1169 d=(unsigned char *)s->init_buf->data;
1170 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1172 for (i=0; r[i] != NULL; i++)
1179 #ifndef OPENSSL_NO_ECDH
1180 if (type & SSL_kEECDH)
1182 /* XXX: For now, we only support named (not generic) curves.
1183 * In this situation, the serverKeyExchange message has:
1184 * [1 byte CurveType], [2 byte CurveName]
1185 * [1 byte length of encoded point], followed by
1186 * the actual encoded point itself
1188 *p = NAMED_CURVE_TYPE;
1196 memcpy((unsigned char*)p,
1197 (unsigned char *)encodedPoint,
1199 OPENSSL_free(encodedPoint);
1204 #ifndef OPENSSL_NO_PSK
1205 if (type & SSL_kPSK)
1207 /* copy PSK identity hint */
1208 s2n(strlen(s->ctx->psk_identity_hint), p);
1209 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1210 p+=strlen(s->ctx->psk_identity_hint);
1217 /* n is the length of the params, they start at
1218 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1220 #ifndef OPENSSL_NO_RSA
1221 if (pkey->type == EVP_PKEY_RSA)
1225 for (num=2; num > 0; num--)
1227 EVP_DigestInit_ex(&md_ctx,(num == 2)
1228 ?s->ctx->md5:s->ctx->sha1, NULL);
1229 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1230 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1231 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1232 EVP_DigestFinal_ex(&md_ctx,q,
1233 (unsigned int *)&i);
1237 if (RSA_sign(NID_md5_sha1, md_buf, j,
1238 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1240 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1248 #if !defined(OPENSSL_NO_DSA)
1249 if (pkey->type == EVP_PKEY_DSA)
1252 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1253 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1254 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1255 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1256 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1257 (unsigned int *)&i,pkey))
1259 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1267 #if !defined(OPENSSL_NO_ECDSA)
1268 if (pkey->type == EVP_PKEY_EC)
1270 /* let's do ECDSA */
1271 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1272 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1273 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1274 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1275 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1276 (unsigned int *)&i,pkey))
1278 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1287 /* Is this error check actually needed? */
1288 al=SSL_AD_HANDSHAKE_FAILURE;
1289 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1294 d = dtls1_set_message_header(s, d,
1295 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1297 /* we should now have things packed up, so lets send
1299 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1302 /* buffer the message to handle re-xmits */
1303 dtls1_buffer_message(s, 0);
1306 s->state = SSL3_ST_SW_KEY_EXCH_B;
1307 EVP_MD_CTX_cleanup(&md_ctx);
1308 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1310 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1312 #ifndef OPENSSL_NO_ECDH
1313 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1314 BN_CTX_free(bn_ctx);
1316 EVP_MD_CTX_cleanup(&md_ctx);
1320 int dtls1_send_certificate_request(SSL *s)
1322 unsigned char *p,*d;
1324 STACK_OF(X509_NAME) *sk=NULL;
1327 unsigned int msg_len;
1329 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1333 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1335 /* get the list of acceptable cert types */
1337 n=ssl3_get_req_cert_type(s,p);
1346 sk=SSL_get_client_CA_list(s);
1350 for (i=0; i<sk_X509_NAME_num(sk); i++)
1352 name=sk_X509_NAME_value(sk,i);
1353 j=i2d_X509_NAME(name,NULL);
1354 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1356 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1359 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1360 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1363 i2d_X509_NAME(name,&p);
1370 i2d_X509_NAME(name,&p);
1371 j-=2; s2n(j,d); j+=2;
1377 /* else no CA names */
1378 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1381 d=(unsigned char *)buf->data;
1382 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1384 s2n(s->d1->handshake_write_seq,d);
1385 s->d1->handshake_write_seq++;
1387 /* we should now have things packed up, so lets send
1390 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1392 #ifdef NETSCAPE_HANG_BUG
1393 /* XXX: what to do about this? */
1394 p=(unsigned char *)s->init_buf->data + s->init_num;
1397 *(p++)=SSL3_MT_SERVER_DONE;
1404 /* XDTLS: set message header ? */
1405 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1406 dtls1_set_message_header(s, (void *)s->init_buf->data,
1407 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1409 /* buffer the message to handle re-xmits */
1410 dtls1_buffer_message(s, 0);
1412 s->state = SSL3_ST_SW_CERT_REQ_B;
1415 /* SSL3_ST_SW_CERT_REQ_B */
1416 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1421 int dtls1_send_server_certificate(SSL *s)
1426 if (s->state == SSL3_ST_SW_CERT_A)
1428 x=ssl_get_server_send_cert(s);
1431 /* VRS: allow null cert if auth == KRB5 */
1432 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1433 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1435 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1440 l=dtls1_output_cert_chain(s,x);
1441 s->state=SSL3_ST_SW_CERT_B;
1445 /* buffer the message to handle re-xmits */
1446 dtls1_buffer_message(s, 0);
1449 /* SSL3_ST_SW_CERT_B */
1450 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1453 #ifndef OPENSSL_NO_TLSEXT
1454 int dtls1_send_newsession_ticket(SSL *s)
1456 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1458 unsigned char *p, *senc, *macstart;
1460 unsigned int hlen, msg_len;
1463 SSL_CTX *tctx = s->initial_ctx;
1464 unsigned char iv[EVP_MAX_IV_LENGTH];
1465 unsigned char key_name[16];
1467 /* get session encoding length */
1468 slen = i2d_SSL_SESSION(s->session, NULL);
1469 /* Some length values are 16 bits, so forget it if session is
1474 /* Grow buffer if need be: the length calculation is as
1475 * follows 12 (DTLS handshake message header) +
1476 * 4 (ticket lifetime hint) + 2 (ticket length) +
1477 * 16 (key name) + max_iv_len (iv length) +
1478 * session_length + max_enc_block_size (max encrypted session
1479 * length) + max_md_size (HMAC).
1481 if (!BUF_MEM_grow(s->init_buf,
1482 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1483 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1485 senc = OPENSSL_malloc(slen);
1489 i2d_SSL_SESSION(s->session, &p);
1491 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1492 EVP_CIPHER_CTX_init(&ctx);
1493 HMAC_CTX_init(&hctx);
1494 /* Initialize HMAC and cipher contexts. If callback present
1495 * it does all the work otherwise use generated values
1498 if (tctx->tlsext_ticket_key_cb)
1500 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1509 RAND_pseudo_bytes(iv, 16);
1510 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1511 tctx->tlsext_tick_aes_key, iv);
1512 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1513 tlsext_tick_md(), NULL);
1514 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1516 l2n(s->session->tlsext_tick_lifetime_hint, p);
1517 /* Skip ticket length for now */
1519 /* Output key name */
1521 memcpy(p, key_name, 16);
1524 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1525 p += EVP_CIPHER_CTX_iv_length(&ctx);
1526 /* Encrypt session data */
1527 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1529 EVP_EncryptFinal(&ctx, p, &len);
1531 EVP_CIPHER_CTX_cleanup(&ctx);
1533 HMAC_Update(&hctx, macstart, p - macstart);
1534 HMAC_Final(&hctx, p, &hlen);
1535 HMAC_CTX_cleanup(&hctx);
1538 /* Now write out lengths: p points to end of data written */
1540 len = p - (unsigned char *)(s->init_buf->data);
1542 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1543 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1545 /* number of bytes to write */
1547 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1551 /* XDTLS: set message header ? */
1552 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1553 dtls1_set_message_header(s, (void *)s->init_buf->data,
1554 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1556 /* buffer the message to handle re-xmits */
1557 dtls1_buffer_message(s, 0);
1560 /* SSL3_ST_SW_SESSION_TICKET_B */
1561 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));