3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to. The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
73 * Copyright remains Eric Young's, and as such any Copyright notices in
74 * the code are not to be removed.
75 * If this package is used in a product, Eric Young should be given attribution
76 * as the author of the parts of the library used.
77 * This can be in the form of a textual message at program startup or
78 * in documentation (online or textual) provided with the package.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
83 * 1. Redistributions of source code must retain the copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * "This product includes cryptographic software written by
91 * Eric Young (eay@cryptsoft.com)"
92 * The word 'cryptographic' can be left out if the rouines from the library
93 * being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 * the apps directory (application code) you must include an acknowledgement:
96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
110 * The licence and distribution terms for any publically available version or
111 * derivative of this code cannot be changed. i.e. this code cannot simply be
112 * copied and put under another distribution licence
113 * [including the GNU Public Licence.]
117 #include "ssl_locl.h"
118 #ifndef OPENSSL_NO_KRB5
119 #include "kssl_lcl.h"
121 #include <openssl/buffer.h>
122 #include <openssl/rand.h>
123 #include <openssl/objects.h>
124 #include <openssl/evp.h>
125 #include <openssl/md5.h>
126 #include <openssl/bn.h>
127 #ifndef OPENSSL_NO_DH
128 #include <openssl/dh.h>
131 static const SSL_METHOD *dtls1_get_client_method(int ver);
132 static int dtls1_get_hello_verify(SSL *s);
134 static const SSL_METHOD *dtls1_get_client_method(int ver)
136 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
137 return(DTLSv1_client_method());
142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
143 ssl_undefined_function,
145 dtls1_get_client_method)
147 int dtls1_connect(SSL *s)
150 unsigned long Time=(unsigned long)time(NULL);
151 void (*cb)(const SSL *ssl,int type,int val)=NULL;
153 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;
165 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
173 case SSL_ST_RENEGOTIATE:
175 s->state=SSL_ST_CONNECT;
176 s->ctx->stats.sess_connect_renegotiate++;
180 case SSL_ST_BEFORE|SSL_ST_CONNECT:
181 case SSL_ST_OK|SSL_ST_CONNECT:
184 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
186 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
187 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
189 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
194 /* s->version=SSL3_VERSION; */
195 s->type=SSL_ST_CONNECT;
197 if (s->init_buf == NULL)
199 if ((buf=BUF_MEM_new()) == NULL)
204 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
213 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
215 /* setup buffing BIO */
216 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
218 /* don't push the buffering BIO quite yet */
220 s->state=SSL3_ST_CW_CLNT_HELLO_A;
221 s->ctx->stats.sess_connect++;
223 /* mark client_random uninitialized */
224 memset(s->s3->client_random,0,sizeof(s->s3->client_random));
225 s->d1->send_cookie = 0;
229 case SSL3_ST_CW_CLNT_HELLO_A:
230 case SSL3_ST_CW_CLNT_HELLO_B:
234 /* every DTLS ClientHello resets Finished MAC */
235 ssl3_init_finished_mac(s);
237 dtls1_start_timer(s);
238 ret=dtls1_client_hello(s);
239 if (ret <= 0) goto end;
241 if ( s->d1->send_cookie)
243 s->state=SSL3_ST_CW_FLUSH;
244 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
247 s->state=SSL3_ST_CR_SRVR_HELLO_A;
251 /* turn on buffering for the next lot of output */
252 if (s->bbio != s->wbio)
253 s->wbio=BIO_push(s->bbio,s->wbio);
257 case SSL3_ST_CR_SRVR_HELLO_A:
258 case SSL3_ST_CR_SRVR_HELLO_B:
259 ret=ssl3_get_server_hello(s);
260 if (ret <= 0) goto end;
264 s->state=SSL3_ST_CR_FINISHED_A;
266 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
271 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
272 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
274 ret = dtls1_get_hello_verify(s);
278 if ( s->d1->send_cookie) /* start again, with a cookie */
279 s->state=SSL3_ST_CW_CLNT_HELLO_A;
281 s->state = SSL3_ST_CR_CERT_A;
285 case SSL3_ST_CR_CERT_A:
286 case SSL3_ST_CR_CERT_B:
287 #ifndef OPENSSL_NO_TLSEXT
288 ret=ssl3_check_finished(s);
289 if (ret <= 0) goto end;
293 if (s->tlsext_ticket_expected)
294 s->state=SSL3_ST_CR_SESSION_TICKET_A;
296 s->state=SSL3_ST_CR_FINISHED_A;
301 /* Check if it is anon DH or PSK */
302 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
303 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
305 ret=ssl3_get_server_certificate(s);
306 if (ret <= 0) goto end;
307 #ifndef OPENSSL_NO_TLSEXT
308 if (s->tlsext_status_expected)
309 s->state=SSL3_ST_CR_CERT_STATUS_A;
311 s->state=SSL3_ST_CR_KEY_EXCH_A;
316 s->state=SSL3_ST_CR_KEY_EXCH_A;
323 s->state=SSL3_ST_CR_KEY_EXCH_A;
328 case SSL3_ST_CR_KEY_EXCH_A:
329 case SSL3_ST_CR_KEY_EXCH_B:
330 ret=ssl3_get_key_exchange(s);
331 if (ret <= 0) goto end;
332 s->state=SSL3_ST_CR_CERT_REQ_A;
335 /* at this point we check that we have the
336 * required stuff from the server */
337 if (!ssl3_check_cert_and_algorithm(s))
344 case SSL3_ST_CR_CERT_REQ_A:
345 case SSL3_ST_CR_CERT_REQ_B:
346 ret=ssl3_get_certificate_request(s);
347 if (ret <= 0) goto end;
348 s->state=SSL3_ST_CR_SRVR_DONE_A;
352 case SSL3_ST_CR_SRVR_DONE_A:
353 case SSL3_ST_CR_SRVR_DONE_B:
354 ret=ssl3_get_server_done(s);
355 if (ret <= 0) goto end;
357 if (s->s3->tmp.cert_req)
358 s->state=SSL3_ST_CW_CERT_A;
360 s->state=SSL3_ST_CW_KEY_EXCH_A;
365 case SSL3_ST_CW_CERT_A:
366 case SSL3_ST_CW_CERT_B:
367 case SSL3_ST_CW_CERT_C:
368 case SSL3_ST_CW_CERT_D:
369 dtls1_start_timer(s);
370 ret=dtls1_send_client_certificate(s);
371 if (ret <= 0) goto end;
372 s->state=SSL3_ST_CW_KEY_EXCH_A;
376 case SSL3_ST_CW_KEY_EXCH_A:
377 case SSL3_ST_CW_KEY_EXCH_B:
378 dtls1_start_timer(s);
379 ret=dtls1_send_client_key_exchange(s);
380 if (ret <= 0) goto end;
381 /* EAY EAY EAY need to check for DH fix cert
383 /* For TLS, cert_req is set to 2, so a cert chain
384 * of nothing is sent, but no verify packet is sent */
385 if (s->s3->tmp.cert_req == 1)
387 s->state=SSL3_ST_CW_CERT_VRFY_A;
391 s->state=SSL3_ST_CW_CHANGE_A;
392 s->s3->change_cipher_spec=0;
398 case SSL3_ST_CW_CERT_VRFY_A:
399 case SSL3_ST_CW_CERT_VRFY_B:
400 dtls1_start_timer(s);
401 ret=dtls1_send_client_verify(s);
402 if (ret <= 0) goto end;
403 s->state=SSL3_ST_CW_CHANGE_A;
405 s->s3->change_cipher_spec=0;
408 case SSL3_ST_CW_CHANGE_A:
409 case SSL3_ST_CW_CHANGE_B:
411 dtls1_start_timer(s);
412 ret=dtls1_send_change_cipher_spec(s,
413 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
414 if (ret <= 0) goto end;
415 s->state=SSL3_ST_CW_FINISHED_A;
418 s->session->cipher=s->s3->tmp.new_cipher;
419 #ifdef OPENSSL_NO_COMP
420 s->session->compress_meth=0;
422 if (s->s3->tmp.new_compression == NULL)
423 s->session->compress_meth=0;
425 s->session->compress_meth=
426 s->s3->tmp.new_compression->id;
428 if (!s->method->ssl3_enc->setup_key_block(s))
434 if (!s->method->ssl3_enc->change_cipher_state(s,
435 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
441 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
444 case SSL3_ST_CW_FINISHED_A:
445 case SSL3_ST_CW_FINISHED_B:
447 dtls1_start_timer(s);
448 ret=dtls1_send_finished(s,
449 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
450 s->method->ssl3_enc->client_finished_label,
451 s->method->ssl3_enc->client_finished_label_len);
452 if (ret <= 0) goto end;
453 s->state=SSL3_ST_CW_FLUSH;
456 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
459 s->s3->tmp.next_state=SSL_ST_OK;
460 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
463 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
464 s->s3->delay_buf_pop_ret=0;
469 #ifndef OPENSSL_NO_TLSEXT
470 /* Allow NewSessionTicket if ticket expected */
471 if (s->tlsext_ticket_expected)
472 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
476 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
481 #ifndef OPENSSL_NO_TLSEXT
482 case SSL3_ST_CR_SESSION_TICKET_A:
483 case SSL3_ST_CR_SESSION_TICKET_B:
484 ret=ssl3_get_new_session_ticket(s);
485 if (ret <= 0) goto end;
486 s->state=SSL3_ST_CR_FINISHED_A;
490 case SSL3_ST_CR_CERT_STATUS_A:
491 case SSL3_ST_CR_CERT_STATUS_B:
492 ret=ssl3_get_cert_status(s);
493 if (ret <= 0) goto end;
494 s->state=SSL3_ST_CR_KEY_EXCH_A;
499 case SSL3_ST_CR_FINISHED_A:
500 case SSL3_ST_CR_FINISHED_B:
501 s->d1->change_cipher_spec_ok = 1;
502 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
503 SSL3_ST_CR_FINISHED_B);
504 if (ret <= 0) goto end;
508 s->state=SSL3_ST_CW_CHANGE_A;
514 case SSL3_ST_CW_FLUSH:
515 s->rwstate=SSL_WRITING;
516 if (BIO_flush(s->wbio) <= 0)
521 s->rwstate=SSL_NOTHING;
522 s->state=s->s3->tmp.next_state;
526 /* clean a few things up */
527 ssl3_cleanup_key_block(s);
530 if (s->init_buf != NULL)
532 BUF_MEM_free(s->init_buf);
537 /* If we are not 'joining' the last two packets,
538 * remove the buffering now */
539 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
540 ssl_free_wbio_buffer(s);
541 /* else do it later in ssl3_write */
546 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
547 if (s->hit) s->ctx->stats.sess_hit++;
551 s->handshake_func=dtls1_connect;
552 s->ctx->stats.sess_connect_good++;
554 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
556 /* done with handshaking */
557 s->d1->handshake_read_seq = 0;
558 s->d1->next_handshake_write_seq = 0;
563 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
569 /* did we do anything */
570 if (!s->s3->tmp.reuse_message && !skip)
574 if ((ret=BIO_flush(s->wbio)) <= 0)
578 if ((cb != NULL) && (s->state != state))
582 cb(s,SSL_CB_CONNECT_LOOP,1);
593 cb(s,SSL_CB_CONNECT_EXIT,ret);
597 int dtls1_client_hello(SSL *s)
602 unsigned long Time,l;
605 buf=(unsigned char *)s->init_buf->data;
606 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
608 SSL_SESSION *sess = s->session;
609 if ((s->session == NULL) ||
610 (s->session->ssl_version != s->version) ||
611 #ifdef OPENSSL_NO_TLSEXT
612 !sess->session_id_length ||
614 (!sess->session_id_length && !sess->tlsext_tick) ||
616 (s->session->not_resumable))
618 if (!ssl_get_new_session(s,0))
621 /* else use the pre-loaded session */
623 p=s->s3->client_random;
625 /* if client_random is initialized, reuse it, we are
626 * required to use same upon reply to HelloVerify */
627 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
628 if (i==sizeof(s->s3->client_random))
630 Time=(unsigned long)time(NULL); /* Time */
632 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
635 /* Do the message type and length last */
636 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
638 *(p++)=s->version>>8;
639 *(p++)=s->version&0xff;
640 s->client_version=s->version;
643 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
650 i=s->session->session_id_length;
654 if (i > sizeof s->session->session_id)
656 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
659 memcpy(p,s->session->session_id,i);
664 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
666 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
669 *(p++) = s->d1->cookie_len;
670 memcpy(p, s->d1->cookie, s->d1->cookie_len);
671 p += s->d1->cookie_len;
673 /* Ciphers supported */
674 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
677 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
684 if (s->ctx->comp_methods == NULL)
687 j=sk_SSL_COMP_num(s->ctx->comp_methods);
691 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
694 *(p++)=0; /* Add the NULL method */
696 #ifndef OPENSSL_NO_TLSEXT
698 if (ssl_prepare_clienthello_tlsext(s) <= 0)
700 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
703 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
705 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
713 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
715 s->state=SSL3_ST_CW_CLNT_HELLO_B;
716 /* number of bytes to write */
720 /* buffer the message to handle re-xmits */
721 dtls1_buffer_message(s, 0);
724 /* SSL3_ST_CW_CLNT_HELLO_B */
725 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
730 static int dtls1_get_hello_verify(SSL *s)
734 unsigned int cookie_len;
736 n=s->method->ssl_get_message(s,
737 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
738 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
743 if (!ok) return((int)n);
745 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
747 s->d1->send_cookie = 0;
748 s->s3->tmp.reuse_message=1;
752 data = (unsigned char *)s->init_msg;
754 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
756 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
757 s->version=(s->version&0xff00)|data[1];
758 al = SSL_AD_PROTOCOL_VERSION;
763 cookie_len = *(data++);
764 if ( cookie_len > sizeof(s->d1->cookie))
766 al=SSL_AD_ILLEGAL_PARAMETER;
770 memcpy(s->d1->cookie, data, cookie_len);
771 s->d1->cookie_len = cookie_len;
773 s->d1->send_cookie = 1;
777 ssl3_send_alert(s, SSL3_AL_FATAL, al);
781 int dtls1_send_client_key_exchange(SSL *s)
786 #ifndef OPENSSL_NO_RSA
790 #ifndef OPENSSL_NO_KRB5
792 #endif /* OPENSSL_NO_KRB5 */
793 #ifndef OPENSSL_NO_ECDH
794 EC_KEY *clnt_ecdh = NULL;
795 const EC_POINT *srvr_ecpoint = NULL;
796 EVP_PKEY *srvr_pub_pkey = NULL;
797 unsigned char *encodedPoint = NULL;
798 int encoded_pt_len = 0;
799 BN_CTX * bn_ctx = NULL;
802 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
804 d=(unsigned char *)s->init_buf->data;
805 p= &(d[DTLS1_HM_HEADER_LENGTH]);
807 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
809 /* Fool emacs indentation */
811 #ifndef OPENSSL_NO_RSA
812 else if (alg_k & SSL_kRSA)
815 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
817 if (s->session->sess_cert == NULL)
819 /* We should always have a server certificate with SSL_kRSA. */
820 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
824 if (s->session->sess_cert->peer_rsa_tmp != NULL)
825 rsa=s->session->sess_cert->peer_rsa_tmp;
828 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
829 if ((pkey == NULL) ||
830 (pkey->type != EVP_PKEY_RSA) ||
831 (pkey->pkey.rsa == NULL))
833 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
840 tmp_buf[0]=s->client_version>>8;
841 tmp_buf[1]=s->client_version&0xff;
842 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
845 s->session->master_key_length=sizeof tmp_buf;
848 /* Fix buf for TLS and [incidentally] DTLS */
849 if (s->version > SSL3_VERSION)
851 n=RSA_public_encrypt(sizeof tmp_buf,
852 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
854 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
855 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
859 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
863 /* Fix buf for TLS and [incidentally] DTLS */
864 if (s->version > SSL3_VERSION)
870 s->session->master_key_length=
871 s->method->ssl3_enc->generate_master_secret(s,
872 s->session->master_key,
873 tmp_buf,sizeof tmp_buf);
874 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
877 #ifndef OPENSSL_NO_KRB5
878 else if (alg_k & SSL_kKRB5)
880 krb5_error_code krb5rc;
881 KSSL_CTX *kssl_ctx = s->kssl_ctx;
882 /* krb5_data krb5_ap_req; */
883 krb5_data *enc_ticket;
884 krb5_data authenticator, *authp = NULL;
885 EVP_CIPHER_CTX ciph_ctx;
886 const EVP_CIPHER *enc = NULL;
887 unsigned char iv[EVP_MAX_IV_LENGTH];
888 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
889 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
890 + EVP_MAX_IV_LENGTH];
891 int padl, outl = sizeof(epms);
893 EVP_CIPHER_CTX_init(&ciph_ctx);
896 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
898 #endif /* KSSL_DEBUG */
902 if (KRB5SENDAUTH) authp = &authenticator;
903 #endif /* KRB5SENDAUTH */
905 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
907 enc = kssl_map_enc(kssl_ctx->enctype);
912 printf("kssl_cget_tkt rtn %d\n", krb5rc);
913 if (krb5rc && kssl_err.text)
914 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
916 #endif /* KSSL_DEBUG */
920 ssl3_send_alert(s,SSL3_AL_FATAL,
921 SSL_AD_HANDSHAKE_FAILURE);
922 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
927 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
928 ** in place of RFC 2712 KerberosWrapper, as in:
930 ** Send ticket (copy to *p, set n = length)
931 ** n = krb5_ap_req.length;
932 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
933 ** if (krb5_ap_req.data)
934 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
936 ** Now using real RFC 2712 KerberosWrapper
937 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
938 ** Note: 2712 "opaque" types are here replaced
939 ** with a 2-byte length followed by the value.
941 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
942 ** Where "xx xx" = length bytes. Shown here with
943 ** optional authenticator omitted.
946 /* KerberosWrapper.Ticket */
947 s2n(enc_ticket->length,p);
948 memcpy(p, enc_ticket->data, enc_ticket->length);
949 p+= enc_ticket->length;
950 n = enc_ticket->length + 2;
952 /* KerberosWrapper.Authenticator */
953 if (authp && authp->length)
955 s2n(authp->length,p);
956 memcpy(p, authp->data, authp->length);
958 n+= authp->length + 2;
966 s2n(0,p);/* null authenticator length */
970 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
973 /* 20010420 VRS. Tried it this way; failed.
974 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
975 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
976 ** kssl_ctx->length);
977 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
980 memset(iv, 0, sizeof iv); /* per RFC 1510 */
981 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
983 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
985 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
987 if (outl > (int)sizeof epms)
989 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
992 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
994 /* KerberosWrapper.EncryptedPreMasterSecret */
996 memcpy(p, epms, outl);
1000 s->session->master_key_length=
1001 s->method->ssl3_enc->generate_master_secret(s,
1002 s->session->master_key,
1003 tmp_buf, sizeof tmp_buf);
1005 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1006 OPENSSL_cleanse(epms, outl);
1009 #ifndef OPENSSL_NO_DH
1010 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1012 DH *dh_srvr,*dh_clnt;
1014 if (s->session->sess_cert == NULL)
1016 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1017 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1021 if (s->session->sess_cert->peer_dh_tmp != NULL)
1022 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1025 /* we get them from the cert */
1026 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1027 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1031 /* generate a new random key */
1032 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1034 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1037 if (!DH_generate_key(dh_clnt))
1039 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1043 /* use the 'p' output buffer for the DH key, but
1044 * make sure to clear it out afterwards */
1046 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1050 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1054 /* generate master key from the result */
1055 s->session->master_key_length=
1056 s->method->ssl3_enc->generate_master_secret(s,
1057 s->session->master_key,p,n);
1061 /* send off the data */
1062 n=BN_num_bytes(dh_clnt->pub_key);
1064 BN_bn2bin(dh_clnt->pub_key,p);
1069 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1072 #ifndef OPENSSL_NO_ECDH
1073 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1075 const EC_GROUP *srvr_group = NULL;
1077 int ecdh_clnt_cert = 0;
1080 if (s->session->sess_cert == NULL)
1082 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1083 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1087 /* Did we send out the client's
1088 * ECDH share for use in premaster
1089 * computation as part of client certificate?
1090 * If so, set ecdh_clnt_cert to 1.
1092 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1094 /* XXX: For now, we do not support client
1095 * authentication using ECDH certificates.
1096 * To add such support, one needs to add
1097 * code that checks for appropriate
1098 * conditions and sets ecdh_clnt_cert to 1.
1099 * For example, the cert have an ECC
1100 * key on the same curve as the server's
1101 * and the key should be authorized for
1104 * One also needs to add code in ssl3_connect
1105 * to skip sending the certificate verify
1108 * if ((s->cert->key->privatekey != NULL) &&
1109 * (s->cert->key->privatekey->type ==
1110 * EVP_PKEY_EC) && ...)
1111 * ecdh_clnt_cert = 1;
1115 if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1117 tkey = s->session->sess_cert->peer_ecdh_tmp;
1121 /* Get the Server Public Key from Cert */
1122 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1123 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1124 if ((srvr_pub_pkey == NULL) ||
1125 (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1126 (srvr_pub_pkey->pkey.ec == NULL))
1128 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1129 ERR_R_INTERNAL_ERROR);
1133 tkey = srvr_pub_pkey->pkey.ec;
1136 srvr_group = EC_KEY_get0_group(tkey);
1137 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1139 if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1141 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1142 ERR_R_INTERNAL_ERROR);
1146 if ((clnt_ecdh=EC_KEY_new()) == NULL)
1148 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1152 if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1154 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1159 /* Reuse key info from our certificate
1160 * We only need our private key to perform
1161 * the ECDH computation.
1163 const BIGNUM *priv_key;
1164 tkey = s->cert->key->privatekey->pkey.ec;
1165 priv_key = EC_KEY_get0_private_key(tkey);
1166 if (priv_key == NULL)
1168 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1171 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1173 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1179 /* Generate a new ECDH key pair */
1180 if (!(EC_KEY_generate_key(clnt_ecdh)))
1182 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1187 /* use the 'p' output buffer for the ECDH key, but
1188 * make sure to clear it out afterwards
1191 field_size = EC_GROUP_get_degree(srvr_group);
1192 if (field_size <= 0)
1194 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1198 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1201 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1206 /* generate master key from the result */
1207 s->session->master_key_length = s->method->ssl3_enc \
1208 -> generate_master_secret(s,
1209 s->session->master_key,
1212 memset(p, 0, n); /* clean up */
1216 /* Send empty client key exch message */
1221 /* First check the size of encoding and
1222 * allocate memory accordingly.
1225 EC_POINT_point2oct(srvr_group,
1226 EC_KEY_get0_public_key(clnt_ecdh),
1227 POINT_CONVERSION_UNCOMPRESSED,
1230 encodedPoint = (unsigned char *)
1231 OPENSSL_malloc(encoded_pt_len *
1232 sizeof(unsigned char));
1233 bn_ctx = BN_CTX_new();
1234 if ((encodedPoint == NULL) ||
1237 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1241 /* Encode the public key */
1242 n = EC_POINT_point2oct(srvr_group,
1243 EC_KEY_get0_public_key(clnt_ecdh),
1244 POINT_CONVERSION_UNCOMPRESSED,
1245 encodedPoint, encoded_pt_len, bn_ctx);
1247 *p = n; /* length of encoded point */
1248 /* Encoded point will be copied here */
1250 /* copy the point */
1251 memcpy((unsigned char *)p, encodedPoint, n);
1252 /* increment n to account for length field */
1256 /* Free allocated memory */
1257 BN_CTX_free(bn_ctx);
1258 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1259 if (clnt_ecdh != NULL)
1260 EC_KEY_free(clnt_ecdh);
1261 EVP_PKEY_free(srvr_pub_pkey);
1263 #endif /* !OPENSSL_NO_ECDH */
1265 #ifndef OPENSSL_NO_PSK
1266 else if (alg_k & SSL_kPSK)
1268 char identity[PSK_MAX_IDENTITY_LEN];
1269 unsigned char *t = NULL;
1270 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1271 unsigned int pre_ms_len = 0, psk_len = 0;
1275 if (s->psk_client_callback == NULL)
1277 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1278 SSL_R_PSK_NO_CLIENT_CB);
1282 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1283 identity, PSK_MAX_IDENTITY_LEN,
1284 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1285 if (psk_len > PSK_MAX_PSK_LEN)
1287 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1288 ERR_R_INTERNAL_ERROR);
1291 else if (psk_len == 0)
1293 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1294 SSL_R_PSK_IDENTITY_NOT_FOUND);
1298 /* create PSK pre_master_secret */
1299 pre_ms_len = 2+psk_len+2+psk_len;
1301 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1303 memset(t, 0, psk_len);
1307 if (s->session->psk_identity_hint != NULL)
1308 OPENSSL_free(s->session->psk_identity_hint);
1309 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1310 if (s->ctx->psk_identity_hint != NULL &&
1311 s->session->psk_identity_hint == NULL)
1313 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1314 ERR_R_MALLOC_FAILURE);
1318 if (s->session->psk_identity != NULL)
1319 OPENSSL_free(s->session->psk_identity);
1320 s->session->psk_identity = BUF_strdup(identity);
1321 if (s->session->psk_identity == NULL)
1323 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1324 ERR_R_MALLOC_FAILURE);
1328 s->session->master_key_length =
1329 s->method->ssl3_enc->generate_master_secret(s,
1330 s->session->master_key,
1331 psk_or_pre_ms, pre_ms_len);
1332 n = strlen(identity);
1334 memcpy(p, identity, n);
1338 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1339 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1342 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1349 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1350 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1354 d = dtls1_set_message_header(s, d,
1355 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1357 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1359 l2n(s->d1->handshake_write_seq,d);
1360 s->d1->handshake_write_seq++;
1363 s->state=SSL3_ST_CW_KEY_EXCH_B;
1364 /* number of bytes to write */
1365 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1368 /* buffer the message to handle re-xmits */
1369 dtls1_buffer_message(s, 0);
1372 /* SSL3_ST_CW_KEY_EXCH_B */
1373 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1375 #ifndef OPENSSL_NO_ECDH
1376 BN_CTX_free(bn_ctx);
1377 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1378 if (clnt_ecdh != NULL)
1379 EC_KEY_free(clnt_ecdh);
1380 EVP_PKEY_free(srvr_pub_pkey);
1385 int dtls1_send_client_verify(SSL *s)
1387 unsigned char *p,*d;
1388 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1390 #ifndef OPENSSL_NO_RSA
1394 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1398 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1400 d=(unsigned char *)s->init_buf->data;
1401 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1402 pkey=s->cert->key->privatekey;
1404 s->method->ssl3_enc->cert_verify_mac(s,
1406 &(data[MD5_DIGEST_LENGTH]));
1408 #ifndef OPENSSL_NO_RSA
1409 if (pkey->type == EVP_PKEY_RSA)
1411 s->method->ssl3_enc->cert_verify_mac(s,
1414 if (RSA_sign(NID_md5_sha1, data,
1415 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1416 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1418 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1426 #ifndef OPENSSL_NO_DSA
1427 if (pkey->type == EVP_PKEY_DSA)
1429 if (!DSA_sign(pkey->save_type,
1430 &(data[MD5_DIGEST_LENGTH]),
1431 SHA_DIGEST_LENGTH,&(p[2]),
1432 (unsigned int *)&j,pkey->pkey.dsa))
1434 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1442 #ifndef OPENSSL_NO_ECDSA
1443 if (pkey->type == EVP_PKEY_EC)
1445 if (!ECDSA_sign(pkey->save_type,
1446 &(data[MD5_DIGEST_LENGTH]),
1447 SHA_DIGEST_LENGTH,&(p[2]),
1448 (unsigned int *)&j,pkey->pkey.ec))
1450 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1460 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1464 d = dtls1_set_message_header(s, d,
1465 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1467 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1470 /* buffer the message to handle re-xmits */
1471 dtls1_buffer_message(s, 0);
1473 s->state = SSL3_ST_CW_CERT_VRFY_B;
1476 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1477 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1482 int dtls1_send_client_certificate(SSL *s)
1485 EVP_PKEY *pkey=NULL;
1489 if (s->state == SSL3_ST_CW_CERT_A)
1491 if ((s->cert == NULL) ||
1492 (s->cert->key->x509 == NULL) ||
1493 (s->cert->key->privatekey == NULL))
1494 s->state=SSL3_ST_CW_CERT_B;
1496 s->state=SSL3_ST_CW_CERT_C;
1499 /* We need to get a client cert */
1500 if (s->state == SSL3_ST_CW_CERT_B)
1502 /* If we get an error, we need to
1503 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1504 * We then get retied later */
1506 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1509 s->rwstate=SSL_X509_LOOKUP;
1512 s->rwstate=SSL_NOTHING;
1513 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1515 s->state=SSL3_ST_CW_CERT_B;
1516 if ( !SSL_use_certificate(s,x509) ||
1517 !SSL_use_PrivateKey(s,pkey))
1523 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1526 if (x509 != NULL) X509_free(x509);
1527 if (pkey != NULL) EVP_PKEY_free(pkey);
1530 if (s->version == SSL3_VERSION)
1532 s->s3->tmp.cert_req=0;
1533 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1538 s->s3->tmp.cert_req=2;
1542 /* Ok, we have a cert */
1543 s->state=SSL3_ST_CW_CERT_C;
1546 if (s->state == SSL3_ST_CW_CERT_C)
1548 s->state=SSL3_ST_CW_CERT_D;
1549 l=dtls1_output_cert_chain(s,
1550 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1554 /* set header called by dtls1_output_cert_chain() */
1556 /* buffer the message to handle re-xmits */
1557 dtls1_buffer_message(s, 0);
1559 /* SSL3_ST_CW_CERT_D */
1560 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));