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_clear_record_buffer(s);
252 dtls1_start_timer(s);
253 ret=dtls1_send_hello_request(s);
254 if (ret <= 0) goto end;
255 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
256 s->state=SSL3_ST_SW_FLUSH;
259 ssl3_init_finished_mac(s);
262 case SSL3_ST_SW_HELLO_REQ_C:
266 case SSL3_ST_SR_CLNT_HELLO_A:
267 case SSL3_ST_SR_CLNT_HELLO_B:
268 case SSL3_ST_SR_CLNT_HELLO_C:
271 ret=ssl3_get_client_hello(s);
272 if (ret <= 0) goto end;
275 if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
276 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
278 s->state = SSL3_ST_SW_SRVR_HELLO_A;
282 /* Reflect ClientHello sequence to remain stateless while listening */
285 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
288 /* If we're just listening, stop here */
289 if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
293 /* Set expected sequence numbers
294 * to continue the handshake.
296 s->d1->handshake_read_seq = 2;
297 s->d1->handshake_write_seq = 1;
298 s->d1->next_handshake_write_seq = 1;
304 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
305 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
307 ret = dtls1_send_hello_verify_request(s);
308 if ( ret <= 0) goto end;
309 s->state=SSL3_ST_SW_FLUSH;
310 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
312 /* HelloVerifyRequest resets Finished MAC */
313 if (s->version != DTLS1_BAD_VER)
314 ssl3_init_finished_mac(s);
317 case SSL3_ST_SW_SRVR_HELLO_A:
318 case SSL3_ST_SW_SRVR_HELLO_B:
320 dtls1_start_timer(s);
321 ret=dtls1_send_server_hello(s);
322 if (ret <= 0) goto end;
324 #ifndef OPENSSL_NO_TLSEXT
327 if (s->tlsext_ticket_expected)
328 s->state=SSL3_ST_SW_SESSION_TICKET_A;
330 s->state=SSL3_ST_SW_CHANGE_A;
334 s->state=SSL3_ST_SW_CHANGE_A;
337 s->state=SSL3_ST_SW_CERT_A;
341 case SSL3_ST_SW_CERT_A:
342 case SSL3_ST_SW_CERT_B:
343 /* Check if it is anon DH or normal PSK */
344 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
345 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
347 dtls1_start_timer(s);
348 ret=dtls1_send_server_certificate(s);
349 if (ret <= 0) goto end;
350 #ifndef OPENSSL_NO_TLSEXT
351 if (s->tlsext_status_expected)
352 s->state=SSL3_ST_SW_CERT_STATUS_A;
354 s->state=SSL3_ST_SW_KEY_EXCH_A;
359 s->state=SSL3_ST_SW_KEY_EXCH_A;
366 s->state=SSL3_ST_SW_KEY_EXCH_A;
371 case SSL3_ST_SW_KEY_EXCH_A:
372 case SSL3_ST_SW_KEY_EXCH_B:
373 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
375 /* clear this, it may get reset by
376 * send_server_key_exchange */
377 if ((s->options & SSL_OP_EPHEMERAL_RSA)
378 #ifndef OPENSSL_NO_KRB5
379 && !(alg_k & SSL_kKRB5)
380 #endif /* OPENSSL_NO_KRB5 */
382 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
383 * even when forbidden by protocol specs
384 * (handshake may fail as clients are not required to
385 * be able to handle this) */
386 s->s3->tmp.use_rsa_tmp=1;
388 s->s3->tmp.use_rsa_tmp=0;
390 /* only send if a DH key exchange or
391 * RSA but we have a sign only certificate */
392 if (s->s3->tmp.use_rsa_tmp
393 /* PSK: send ServerKeyExchange if PSK identity
394 * hint if provided */
395 #ifndef OPENSSL_NO_PSK
396 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
398 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
399 || (alg_k & SSL_kEECDH)
400 || ((alg_k & SSL_kRSA)
401 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
402 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
403 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
409 dtls1_start_timer(s);
410 ret=dtls1_send_server_key_exchange(s);
411 if (ret <= 0) goto end;
416 s->state=SSL3_ST_SW_CERT_REQ_A;
420 case SSL3_ST_SW_CERT_REQ_A:
421 case SSL3_ST_SW_CERT_REQ_B:
422 if (/* don't request cert unless asked for it: */
423 !(s->verify_mode & SSL_VERIFY_PEER) ||
424 /* if SSL_VERIFY_CLIENT_ONCE is set,
425 * don't request cert during re-negotiation: */
426 ((s->session->peer != NULL) &&
427 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
428 /* never request cert in anonymous ciphersuites
429 * (see section "Certificate request" in SSL 3 drafts
430 * and in RFC 2246): */
431 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
432 /* ... except when the application insists on verification
433 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
434 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
435 /* never request cert in Kerberos ciphersuites */
436 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
437 /* With normal PSK Certificates and
438 * Certificate Requests are omitted */
439 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
441 /* no cert request */
443 s->s3->tmp.cert_request=0;
444 s->state=SSL3_ST_SW_SRVR_DONE_A;
448 s->s3->tmp.cert_request=1;
449 dtls1_start_timer(s);
450 ret=dtls1_send_certificate_request(s);
451 if (ret <= 0) goto end;
452 #ifndef NETSCAPE_HANG_BUG
453 s->state=SSL3_ST_SW_SRVR_DONE_A;
455 s->state=SSL3_ST_SW_FLUSH;
456 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
462 case SSL3_ST_SW_SRVR_DONE_A:
463 case SSL3_ST_SW_SRVR_DONE_B:
464 dtls1_start_timer(s);
465 ret=dtls1_send_server_done(s);
466 if (ret <= 0) goto end;
467 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
468 s->state=SSL3_ST_SW_FLUSH;
472 case SSL3_ST_SW_FLUSH:
473 s->rwstate=SSL_WRITING;
474 if (BIO_flush(s->wbio) <= 0)
479 s->rwstate=SSL_NOTHING;
480 s->state=s->s3->tmp.next_state;
483 case SSL3_ST_SR_CERT_A:
484 case SSL3_ST_SR_CERT_B:
485 /* Check for second client hello (MS SGC) */
486 ret = ssl3_check_client_hello(s);
492 s->state = SSL3_ST_SR_CLNT_HELLO_C;
495 if (s->s3->tmp.cert_request)
497 ret=ssl3_get_client_certificate(s);
498 if (ret <= 0) goto end;
501 s->state=SSL3_ST_SR_KEY_EXCH_A;
505 case SSL3_ST_SR_KEY_EXCH_A:
506 case SSL3_ST_SR_KEY_EXCH_B:
507 ret=ssl3_get_client_key_exchange(s);
508 if (ret <= 0) goto end;
509 s->state=SSL3_ST_SR_CERT_VRFY_A;
514 /* For the ECDH ciphersuites when
515 * the client sends its ECDH pub key in
516 * a certificate, the CertificateVerify
517 * message is not sent.
519 s->state=SSL3_ST_SR_FINISHED_A;
524 s->state=SSL3_ST_SR_CERT_VRFY_A;
527 /* We need to get hashes here so if there is
528 * a client cert, it can be verified */
529 s->method->ssl3_enc->cert_verify_mac(s,
531 &(s->s3->tmp.cert_verify_md[0]));
532 s->method->ssl3_enc->cert_verify_mac(s,
534 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
538 case SSL3_ST_SR_CERT_VRFY_A:
539 case SSL3_ST_SR_CERT_VRFY_B:
541 s->d1->change_cipher_spec_ok = 1;
542 /* we should decide if we expected this one */
543 ret=ssl3_get_cert_verify(s);
544 if (ret <= 0) goto end;
546 s->state=SSL3_ST_SR_FINISHED_A;
550 case SSL3_ST_SR_FINISHED_A:
551 case SSL3_ST_SR_FINISHED_B:
552 s->d1->change_cipher_spec_ok = 1;
553 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
554 SSL3_ST_SR_FINISHED_B);
555 if (ret <= 0) goto end;
559 #ifndef OPENSSL_NO_TLSEXT
560 else if (s->tlsext_ticket_expected)
561 s->state=SSL3_ST_SW_SESSION_TICKET_A;
564 s->state=SSL3_ST_SW_CHANGE_A;
568 #ifndef OPENSSL_NO_TLSEXT
569 case SSL3_ST_SW_SESSION_TICKET_A:
570 case SSL3_ST_SW_SESSION_TICKET_B:
571 ret=dtls1_send_newsession_ticket(s);
572 if (ret <= 0) goto end;
573 s->state=SSL3_ST_SW_CHANGE_A;
577 case SSL3_ST_SW_CERT_STATUS_A:
578 case SSL3_ST_SW_CERT_STATUS_B:
579 ret=ssl3_send_cert_status(s);
580 if (ret <= 0) goto end;
581 s->state=SSL3_ST_SW_KEY_EXCH_A;
587 case SSL3_ST_SW_CHANGE_A:
588 case SSL3_ST_SW_CHANGE_B:
590 s->session->cipher=s->s3->tmp.new_cipher;
591 if (!s->method->ssl3_enc->setup_key_block(s))
592 { ret= -1; goto end; }
594 ret=dtls1_send_change_cipher_spec(s,
595 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
597 if (ret <= 0) goto end;
598 s->state=SSL3_ST_SW_FINISHED_A;
601 if (!s->method->ssl3_enc->change_cipher_state(s,
602 SSL3_CHANGE_CIPHER_SERVER_WRITE))
608 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
611 case SSL3_ST_SW_FINISHED_A:
612 case SSL3_ST_SW_FINISHED_B:
613 ret=dtls1_send_finished(s,
614 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
615 s->method->ssl3_enc->server_finished_label,
616 s->method->ssl3_enc->server_finished_label_len);
617 if (ret <= 0) goto end;
618 s->state=SSL3_ST_SW_FLUSH;
620 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
622 s->s3->tmp.next_state=SSL_ST_OK;
627 /* clean a few things up */
628 ssl3_cleanup_key_block(s);
631 BUF_MEM_free(s->init_buf);
635 /* remove buffering on output */
636 ssl_free_wbio_buffer(s);
640 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
642 /* actually not necessarily a 'new' session unless
643 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
647 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
649 s->ctx->stats.sess_accept_good++;
651 s->handshake_func=dtls1_accept;
653 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
658 /* done handshaking, next message is client hello */
659 s->d1->handshake_read_seq = 0;
660 /* next message is server hello */
661 s->d1->handshake_write_seq = 0;
662 s->d1->next_handshake_write_seq = 0;
667 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
673 if (!s->s3->tmp.reuse_message && !skip)
677 if ((ret=BIO_flush(s->wbio)) <= 0)
682 if ((cb != NULL) && (s->state != state))
686 cb(s,SSL_CB_ACCEPT_LOOP,1);
693 /* BIO_flush(s->wbio); */
697 cb(s,SSL_CB_ACCEPT_EXIT,ret);
701 int dtls1_send_hello_request(SSL *s)
705 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
707 p=(unsigned char *)s->init_buf->data;
708 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
710 s->state=SSL3_ST_SW_HELLO_REQ_B;
711 /* number of bytes to write */
712 s->init_num=DTLS1_HM_HEADER_LENGTH;
715 /* no need to buffer this message, since there are no retransmit
719 /* SSL3_ST_SW_HELLO_REQ_B */
720 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
723 int dtls1_send_hello_verify_request(SSL *s)
725 unsigned int msg_len;
726 unsigned char *msg, *buf, *p;
728 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
730 buf = (unsigned char *)s->init_buf->data;
732 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
733 *(p++) = s->version >> 8;
734 *(p++) = s->version & 0xFF;
736 if (s->ctx->app_gen_cookie_cb == NULL ||
737 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
738 &(s->d1->cookie_len)) == 0)
740 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
744 *(p++) = (unsigned char) s->d1->cookie_len;
745 memcpy(p, s->d1->cookie, s->d1->cookie_len);
746 p += s->d1->cookie_len;
749 dtls1_set_message_header(s, buf,
750 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
752 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
753 /* number of bytes to write */
758 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
759 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
762 int dtls1_send_server_hello(SSL *s)
768 unsigned long l,Time;
770 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
772 buf=(unsigned char *)s->init_buf->data;
773 p=s->s3->server_random;
774 Time=(unsigned long)time(NULL); /* Time */
776 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
777 /* Do the message type and length last */
778 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
780 *(p++)=s->version>>8;
781 *(p++)=s->version&0xff;
784 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
787 /* now in theory we have 3 options to sending back the
788 * session id. If it is a re-use, we send back the
789 * old session-id, if it is a new session, we send
790 * back the new session-id or we send back a 0 length
791 * session-id if we want it to be single use.
792 * Currently I will not implement the '0' length session-id
793 * 12-Jan-98 - I'll now support the '0' length stuff.
795 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
796 s->session->session_id_length=0;
798 sl=s->session->session_id_length;
799 if (sl > sizeof s->session->session_id)
801 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
805 memcpy(p,s->session->session_id,sl);
809 if (s->s3->tmp.new_cipher == NULL)
811 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
814 /* put the compression method */
815 #ifdef OPENSSL_NO_COMP
818 if (s->s3->tmp.new_compression == NULL)
821 *(p++)=s->s3->tmp.new_compression->id;
824 #ifndef OPENSSL_NO_TLSEXT
825 if (ssl_prepare_serverhello_tlsext(s) <= 0)
827 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
830 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
832 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
841 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
843 s->state=SSL3_ST_SW_SRVR_HELLO_B;
844 /* number of bytes to write */
848 /* buffer the message to handle re-xmits */
849 dtls1_buffer_message(s, 0);
852 /* SSL3_ST_SW_SRVR_HELLO_B */
853 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
856 int dtls1_send_server_done(SSL *s)
860 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
862 p=(unsigned char *)s->init_buf->data;
865 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
867 s->state=SSL3_ST_SW_SRVR_DONE_B;
868 /* number of bytes to write */
869 s->init_num=DTLS1_HM_HEADER_LENGTH;
872 /* buffer the message to handle re-xmits */
873 dtls1_buffer_message(s, 0);
876 /* SSL3_ST_SW_SRVR_DONE_B */
877 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
880 int dtls1_send_server_key_exchange(SSL *s)
882 #ifndef OPENSSL_NO_RSA
886 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
889 #ifndef OPENSSL_NO_DH
892 #ifndef OPENSSL_NO_ECDH
893 EC_KEY *ecdh=NULL, *ecdhp;
894 unsigned char *encodedPoint = NULL;
897 BN_CTX *bn_ctx = NULL;
910 EVP_MD_CTX_init(&md_ctx);
911 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
913 type=s->s3->tmp.new_cipher->algorithm_mkey;
918 r[0]=r[1]=r[2]=r[3]=NULL;
920 #ifndef OPENSSL_NO_RSA
924 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
926 rsa=s->cert->rsa_tmp_cb(s,
927 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
928 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
931 al=SSL_AD_HANDSHAKE_FAILURE;
932 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
940 al=SSL_AD_HANDSHAKE_FAILURE;
941 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
946 s->s3->tmp.use_rsa_tmp=1;
950 #ifndef OPENSSL_NO_DH
954 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
955 dhp=s->cert->dh_tmp_cb(s,
956 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
957 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
960 al=SSL_AD_HANDSHAKE_FAILURE;
961 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
965 if (s->s3->tmp.dh != NULL)
968 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
972 if ((dh=DHparams_dup(dhp)) == NULL)
974 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
979 if ((dhp->pub_key == NULL ||
980 dhp->priv_key == NULL ||
981 (s->options & SSL_OP_SINGLE_DH_USE)))
983 if(!DH_generate_key(dh))
985 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
992 dh->pub_key=BN_dup(dhp->pub_key);
993 dh->priv_key=BN_dup(dhp->priv_key);
994 if ((dh->pub_key == NULL) ||
995 (dh->priv_key == NULL))
997 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1007 #ifndef OPENSSL_NO_ECDH
1008 if (type & SSL_kEECDH)
1010 const EC_GROUP *group;
1012 ecdhp=cert->ecdh_tmp;
1013 if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1015 ecdhp=s->cert->ecdh_tmp_cb(s,
1016 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1017 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1021 al=SSL_AD_HANDSHAKE_FAILURE;
1022 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1026 if (s->s3->tmp.ecdh != NULL)
1028 EC_KEY_free(s->s3->tmp.ecdh);
1029 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1033 /* Duplicate the ECDH structure. */
1036 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1039 if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1041 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1045 s->s3->tmp.ecdh=ecdh;
1046 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1047 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1048 (s->options & SSL_OP_SINGLE_ECDH_USE))
1050 if(!EC_KEY_generate_key(ecdh))
1052 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1057 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1058 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1059 (EC_KEY_get0_private_key(ecdh) == NULL))
1061 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1065 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1066 (EC_GROUP_get_degree(group) > 163))
1068 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1072 /* XXX: For now, we only support ephemeral ECDH
1073 * keys over named (not generic) curves. For
1074 * supported named curves, curve_id is non-zero.
1077 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1080 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1084 /* Encode the public key.
1085 * First check the size of encoding and
1086 * allocate memory accordingly.
1088 encodedlen = EC_POINT_point2oct(group,
1089 EC_KEY_get0_public_key(ecdh),
1090 POINT_CONVERSION_UNCOMPRESSED,
1093 encodedPoint = (unsigned char *)
1094 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1095 bn_ctx = BN_CTX_new();
1096 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1098 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1103 encodedlen = EC_POINT_point2oct(group,
1104 EC_KEY_get0_public_key(ecdh),
1105 POINT_CONVERSION_UNCOMPRESSED,
1106 encodedPoint, encodedlen, bn_ctx);
1108 if (encodedlen == 0)
1110 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1114 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1116 /* XXX: For now, we only support named (not
1117 * generic) curves in ECDH ephemeral key exchanges.
1118 * In this situation, we need four additional bytes
1119 * to encode the entire ServerECDHParams
1124 /* We'll generate the serverKeyExchange message
1125 * explicitly so we can set these to NULLs
1133 #endif /* !OPENSSL_NO_ECDH */
1134 #ifndef OPENSSL_NO_PSK
1135 if (type & SSL_kPSK)
1137 /* reserve size for record length and PSK identity hint*/
1138 n+=2+strlen(s->ctx->psk_identity_hint);
1141 #endif /* !OPENSSL_NO_PSK */
1143 al=SSL_AD_HANDSHAKE_FAILURE;
1144 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1147 for (i=0; r[i] != NULL; i++)
1149 nr[i]=BN_num_bytes(r[i]);
1153 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1154 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1156 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1159 al=SSL_AD_DECODE_ERROR;
1162 kn=EVP_PKEY_size(pkey);
1170 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1172 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1175 d=(unsigned char *)s->init_buf->data;
1176 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1178 for (i=0; r[i] != NULL; i++)
1185 #ifndef OPENSSL_NO_ECDH
1186 if (type & SSL_kEECDH)
1188 /* XXX: For now, we only support named (not generic) curves.
1189 * In this situation, the serverKeyExchange message has:
1190 * [1 byte CurveType], [2 byte CurveName]
1191 * [1 byte length of encoded point], followed by
1192 * the actual encoded point itself
1194 *p = NAMED_CURVE_TYPE;
1202 memcpy((unsigned char*)p,
1203 (unsigned char *)encodedPoint,
1205 OPENSSL_free(encodedPoint);
1206 encodedPoint = NULL;
1211 #ifndef OPENSSL_NO_PSK
1212 if (type & SSL_kPSK)
1214 /* copy PSK identity hint */
1215 s2n(strlen(s->ctx->psk_identity_hint), p);
1216 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1217 p+=strlen(s->ctx->psk_identity_hint);
1224 /* n is the length of the params, they start at
1225 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1227 #ifndef OPENSSL_NO_RSA
1228 if (pkey->type == EVP_PKEY_RSA)
1232 for (num=2; num > 0; num--)
1234 EVP_DigestInit_ex(&md_ctx,(num == 2)
1235 ?s->ctx->md5:s->ctx->sha1, NULL);
1236 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1237 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1238 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1239 EVP_DigestFinal_ex(&md_ctx,q,
1240 (unsigned int *)&i);
1244 if (RSA_sign(NID_md5_sha1, md_buf, j,
1245 &(p[2]), &u, pkey->pkey.rsa) <= 0)
1247 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1255 #if !defined(OPENSSL_NO_DSA)
1256 if (pkey->type == EVP_PKEY_DSA)
1259 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1260 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1261 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1262 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1263 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1264 (unsigned int *)&i,pkey))
1266 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1274 #if !defined(OPENSSL_NO_ECDSA)
1275 if (pkey->type == EVP_PKEY_EC)
1277 /* let's do ECDSA */
1278 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1279 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1280 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1281 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1282 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1283 (unsigned int *)&i,pkey))
1285 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1294 /* Is this error check actually needed? */
1295 al=SSL_AD_HANDSHAKE_FAILURE;
1296 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1301 d = dtls1_set_message_header(s, d,
1302 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1304 /* we should now have things packed up, so lets send
1306 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1309 /* buffer the message to handle re-xmits */
1310 dtls1_buffer_message(s, 0);
1313 s->state = SSL3_ST_SW_KEY_EXCH_B;
1314 EVP_MD_CTX_cleanup(&md_ctx);
1315 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1317 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1319 #ifndef OPENSSL_NO_ECDH
1320 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1321 BN_CTX_free(bn_ctx);
1323 EVP_MD_CTX_cleanup(&md_ctx);
1327 int dtls1_send_certificate_request(SSL *s)
1329 unsigned char *p,*d;
1331 STACK_OF(X509_NAME) *sk=NULL;
1334 unsigned int msg_len;
1336 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1340 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1342 /* get the list of acceptable cert types */
1344 n=ssl3_get_req_cert_type(s,p);
1353 sk=SSL_get_client_CA_list(s);
1357 for (i=0; i<sk_X509_NAME_num(sk); i++)
1359 name=sk_X509_NAME_value(sk,i);
1360 j=i2d_X509_NAME(name,NULL);
1361 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1363 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1366 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1367 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1370 i2d_X509_NAME(name,&p);
1377 i2d_X509_NAME(name,&p);
1378 j-=2; s2n(j,d); j+=2;
1384 /* else no CA names */
1385 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1388 d=(unsigned char *)buf->data;
1389 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1391 s2n(s->d1->handshake_write_seq,d);
1392 s->d1->handshake_write_seq++;
1394 /* we should now have things packed up, so lets send
1397 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1399 #ifdef NETSCAPE_HANG_BUG
1400 /* XXX: what to do about this? */
1401 p=(unsigned char *)s->init_buf->data + s->init_num;
1404 *(p++)=SSL3_MT_SERVER_DONE;
1411 /* XDTLS: set message header ? */
1412 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1413 dtls1_set_message_header(s, (void *)s->init_buf->data,
1414 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1416 /* buffer the message to handle re-xmits */
1417 dtls1_buffer_message(s, 0);
1419 s->state = SSL3_ST_SW_CERT_REQ_B;
1422 /* SSL3_ST_SW_CERT_REQ_B */
1423 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1428 int dtls1_send_server_certificate(SSL *s)
1433 if (s->state == SSL3_ST_SW_CERT_A)
1435 x=ssl_get_server_send_cert(s);
1438 /* VRS: allow null cert if auth == KRB5 */
1439 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1440 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1442 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1447 l=dtls1_output_cert_chain(s,x);
1448 s->state=SSL3_ST_SW_CERT_B;
1452 /* buffer the message to handle re-xmits */
1453 dtls1_buffer_message(s, 0);
1456 /* SSL3_ST_SW_CERT_B */
1457 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1460 #ifndef OPENSSL_NO_TLSEXT
1461 int dtls1_send_newsession_ticket(SSL *s)
1463 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1465 unsigned char *p, *senc, *macstart;
1467 unsigned int hlen, msg_len;
1470 SSL_CTX *tctx = s->initial_ctx;
1471 unsigned char iv[EVP_MAX_IV_LENGTH];
1472 unsigned char key_name[16];
1474 /* get session encoding length */
1475 slen = i2d_SSL_SESSION(s->session, NULL);
1476 /* Some length values are 16 bits, so forget it if session is
1481 /* Grow buffer if need be: the length calculation is as
1482 * follows 12 (DTLS handshake message header) +
1483 * 4 (ticket lifetime hint) + 2 (ticket length) +
1484 * 16 (key name) + max_iv_len (iv length) +
1485 * session_length + max_enc_block_size (max encrypted session
1486 * length) + max_md_size (HMAC).
1488 if (!BUF_MEM_grow(s->init_buf,
1489 DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1490 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1492 senc = OPENSSL_malloc(slen);
1496 i2d_SSL_SESSION(s->session, &p);
1498 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1499 EVP_CIPHER_CTX_init(&ctx);
1500 HMAC_CTX_init(&hctx);
1501 /* Initialize HMAC and cipher contexts. If callback present
1502 * it does all the work otherwise use generated values
1505 if (tctx->tlsext_ticket_key_cb)
1507 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1516 RAND_pseudo_bytes(iv, 16);
1517 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1518 tctx->tlsext_tick_aes_key, iv);
1519 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1520 tlsext_tick_md(), NULL);
1521 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1523 l2n(s->session->tlsext_tick_lifetime_hint, p);
1524 /* Skip ticket length for now */
1526 /* Output key name */
1528 memcpy(p, key_name, 16);
1531 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1532 p += EVP_CIPHER_CTX_iv_length(&ctx);
1533 /* Encrypt session data */
1534 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1536 EVP_EncryptFinal(&ctx, p, &len);
1538 EVP_CIPHER_CTX_cleanup(&ctx);
1540 HMAC_Update(&hctx, macstart, p - macstart);
1541 HMAC_Final(&hctx, p, &hlen);
1542 HMAC_CTX_cleanup(&hctx);
1545 /* Now write out lengths: p points to end of data written */
1547 len = p - (unsigned char *)(s->init_buf->data);
1549 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1550 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1552 /* number of bytes to write */
1554 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1558 /* XDTLS: set message header ? */
1559 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1560 dtls1_set_message_header(s, (void *)s->init_buf->data,
1561 SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1563 /* buffer the message to handle re-xmits */
1564 dtls1_buffer_message(s, 0);
1567 /* SSL3_ST_SW_SESSION_TICKET_B */
1568 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));