3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to. The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
73 * Copyright remains Eric Young's, and as such any Copyright notices in
74 * the code are not to be removed.
75 * If this package is used in a product, Eric Young should be given attribution
76 * as the author of the parts of the library used.
77 * This can be in the form of a textual message at program startup or
78 * in documentation (online or textual) provided with the package.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
83 * 1. Redistributions of source code must retain the copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * "This product includes cryptographic software written by
91 * Eric Young (eay@cryptsoft.com)"
92 * The word 'cryptographic' can be left out if the rouines from the library
93 * being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 * the apps directory (application code) you must include an acknowledgement:
96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
110 * The licence and distribution terms for any publically available version or
111 * derivative of this code cannot be changed. i.e. this code cannot simply be
112 * copied and put under another distribution licence
113 * [including the GNU Public Licence.]
117 #include "ssl_locl.h"
118 #include <openssl/buffer.h>
119 #include <openssl/rand.h>
120 #include <openssl/objects.h>
121 #include <openssl/evp.h>
122 #include <openssl/x509.h>
123 #include <openssl/md5.h>
124 #include <openssl/bn.h>
125 #ifndef OPENSSL_NO_DH
126 #include <openssl/dh.h>
129 static const SSL_METHOD
*dtls1_get_server_method(int ver
);
130 static int dtls1_send_hello_verify_request(SSL
*s
);
132 static const SSL_METHOD
*dtls1_get_server_method(int ver
)
134 if (ver
== DTLS1_VERSION
)
135 return(DTLSv1_server_method());
140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method
,
142 ssl_undefined_function
,
143 dtls1_get_server_method
)
145 int dtls1_accept(SSL
*s
)
148 unsigned long Time
=(unsigned long)time(NULL
);
149 void (*cb
)(const SSL
*ssl
,int type
,int val
)=NULL
;
152 int new_state
,state
,skip
=0;
154 RAND_add(&Time
,sizeof(Time
),0);
158 if (s
->info_callback
!= NULL
)
160 else if (s
->ctx
->info_callback
!= NULL
)
161 cb
=s
->ctx
->info_callback
;
163 /* init things to blank */
165 if (!SSL_in_init(s
) || SSL_in_before(s
)) SSL_clear(s
);
169 SSLerr(SSL_F_DTLS1_ACCEPT
,SSL_R_NO_CERTIFICATE_SET
);
179 case SSL_ST_RENEGOTIATE
:
181 /* s->state=SSL_ST_ACCEPT; */
185 case SSL_ST_BEFORE
|SSL_ST_ACCEPT
:
186 case SSL_ST_OK
|SSL_ST_ACCEPT
:
189 if (cb
!= NULL
) cb(s
,SSL_CB_HANDSHAKE_START
,1);
191 if ((s
->version
& 0xff00) != (DTLS1_VERSION
& 0xff00))
193 SSLerr(SSL_F_DTLS1_ACCEPT
, ERR_R_INTERNAL_ERROR
);
196 s
->type
=SSL_ST_ACCEPT
;
198 if (s
->init_buf
== NULL
)
200 if ((buf
=BUF_MEM_new()) == NULL
)
205 if (!BUF_MEM_grow(buf
,SSL3_RT_MAX_PLAIN_LENGTH
))
213 if (!ssl3_setup_buffers(s
))
221 if (s
->state
!= SSL_ST_RENEGOTIATE
)
223 /* Ok, we now need to push on a buffering BIO so that
224 * the output is sent in a way that TCP likes :-)
226 if (!ssl_init_wbio_buffer(s
,1)) { ret
= -1; goto end
; }
228 ssl3_init_finished_mac(s
);
229 s
->state
=SSL3_ST_SR_CLNT_HELLO_A
;
230 s
->ctx
->stats
.sess_accept
++;
234 /* s->state == SSL_ST_RENEGOTIATE,
235 * we will just send a HelloRequest */
236 s
->ctx
->stats
.sess_accept_renegotiate
++;
237 s
->state
=SSL3_ST_SW_HELLO_REQ_A
;
242 case SSL3_ST_SW_HELLO_REQ_A
:
243 case SSL3_ST_SW_HELLO_REQ_B
:
246 dtls1_start_timer(s
);
247 ret
=dtls1_send_hello_request(s
);
248 if (ret
<= 0) goto end
;
249 s
->s3
->tmp
.next_state
=SSL3_ST_SW_HELLO_REQ_C
;
250 s
->state
=SSL3_ST_SW_FLUSH
;
253 ssl3_init_finished_mac(s
);
256 case SSL3_ST_SW_HELLO_REQ_C
:
260 case SSL3_ST_SR_CLNT_HELLO_A
:
261 case SSL3_ST_SR_CLNT_HELLO_B
:
262 case SSL3_ST_SR_CLNT_HELLO_C
:
265 ret
=ssl3_get_client_hello(s
);
266 if (ret
<= 0) goto end
;
269 if (ret
== 1 && (SSL_get_options(s
) & SSL_OP_COOKIE_EXCHANGE
))
270 s
->state
= DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A
;
272 s
->state
= SSL3_ST_SW_SRVR_HELLO_A
;
276 /* If we're just listening, stop here */
277 if (s
->d1
->listen
&& s
->state
== SSL3_ST_SW_SRVR_HELLO_A
)
286 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A
:
287 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B
:
289 dtls1_start_timer(s
);
290 ret
= dtls1_send_hello_verify_request(s
);
291 if ( ret
<= 0) goto end
;
292 s
->state
=SSL3_ST_SW_FLUSH
;
293 s
->s3
->tmp
.next_state
=SSL3_ST_SR_CLNT_HELLO_A
;
295 /* HelloVerifyRequest resets Finished MAC */
296 if (s
->version
!= DTLS1_BAD_VER
)
297 ssl3_init_finished_mac(s
);
300 case SSL3_ST_SW_SRVR_HELLO_A
:
301 case SSL3_ST_SW_SRVR_HELLO_B
:
303 dtls1_start_timer(s
);
304 ret
=dtls1_send_server_hello(s
);
305 if (ret
<= 0) goto end
;
307 #ifndef OPENSSL_NO_TLSEXT
310 if (s
->tlsext_ticket_expected
)
311 s
->state
=SSL3_ST_SW_SESSION_TICKET_A
;
313 s
->state
=SSL3_ST_SW_CHANGE_A
;
317 s
->state
=SSL3_ST_SW_CHANGE_A
;
320 s
->state
=SSL3_ST_SW_CERT_A
;
324 case SSL3_ST_SW_CERT_A
:
325 case SSL3_ST_SW_CERT_B
:
326 /* Check if it is anon DH or normal PSK */
327 if (!(s
->s3
->tmp
.new_cipher
->algorithm_auth
& SSL_aNULL
)
328 && !(s
->s3
->tmp
.new_cipher
->algorithm_mkey
& SSL_kPSK
))
330 dtls1_start_timer(s
);
331 ret
=dtls1_send_server_certificate(s
);
332 if (ret
<= 0) goto end
;
333 #ifndef OPENSSL_NO_TLSEXT
334 if (s
->tlsext_status_expected
)
335 s
->state
=SSL3_ST_SW_CERT_STATUS_A
;
337 s
->state
=SSL3_ST_SW_KEY_EXCH_A
;
342 s
->state
=SSL3_ST_SW_KEY_EXCH_A
;
349 s
->state
=SSL3_ST_SW_KEY_EXCH_A
;
354 case SSL3_ST_SW_KEY_EXCH_A
:
355 case SSL3_ST_SW_KEY_EXCH_B
:
356 alg_k
= s
->s3
->tmp
.new_cipher
->algorithm_mkey
;
358 /* clear this, it may get reset by
359 * send_server_key_exchange */
360 if ((s
->options
& SSL_OP_EPHEMERAL_RSA
)
361 #ifndef OPENSSL_NO_KRB5
362 && !(alg_k
& SSL_kKRB5
)
363 #endif /* OPENSSL_NO_KRB5 */
365 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
366 * even when forbidden by protocol specs
367 * (handshake may fail as clients are not required to
368 * be able to handle this) */
369 s
->s3
->tmp
.use_rsa_tmp
=1;
371 s
->s3
->tmp
.use_rsa_tmp
=0;
373 /* only send if a DH key exchange or
374 * RSA but we have a sign only certificate */
375 if (s
->s3
->tmp
.use_rsa_tmp
376 /* PSK: send ServerKeyExchange if PSK identity
377 * hint if provided */
378 #ifndef OPENSSL_NO_PSK
379 || ((alg_k
& SSL_kPSK
) && s
->ctx
->psk_identity_hint
)
381 || (alg_k
& (SSL_kEDH
|SSL_kDHr
|SSL_kDHd
))
382 || (alg_k
& SSL_kEECDH
)
383 || ((alg_k
& SSL_kRSA
)
384 && (s
->cert
->pkeys
[SSL_PKEY_RSA_ENC
].privatekey
== NULL
385 || (SSL_C_IS_EXPORT(s
->s3
->tmp
.new_cipher
)
386 && EVP_PKEY_size(s
->cert
->pkeys
[SSL_PKEY_RSA_ENC
].privatekey
)*8 > SSL_C_EXPORT_PKEYLENGTH(s
->s3
->tmp
.new_cipher
)
392 dtls1_start_timer(s
);
393 ret
=dtls1_send_server_key_exchange(s
);
394 if (ret
<= 0) goto end
;
399 s
->state
=SSL3_ST_SW_CERT_REQ_A
;
403 case SSL3_ST_SW_CERT_REQ_A
:
404 case SSL3_ST_SW_CERT_REQ_B
:
405 if (/* don't request cert unless asked for it: */
406 !(s
->verify_mode
& SSL_VERIFY_PEER
) ||
407 /* if SSL_VERIFY_CLIENT_ONCE is set,
408 * don't request cert during re-negotiation: */
409 ((s
->session
->peer
!= NULL
) &&
410 (s
->verify_mode
& SSL_VERIFY_CLIENT_ONCE
)) ||
411 /* never request cert in anonymous ciphersuites
412 * (see section "Certificate request" in SSL 3 drafts
413 * and in RFC 2246): */
414 ((s
->s3
->tmp
.new_cipher
->algorithm_auth
& SSL_aNULL
) &&
415 /* ... except when the application insists on verification
416 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
417 !(s
->verify_mode
& SSL_VERIFY_FAIL_IF_NO_PEER_CERT
)) ||
418 /* never request cert in Kerberos ciphersuites */
419 (s
->s3
->tmp
.new_cipher
->algorithm_auth
& SSL_aKRB5
)
420 /* With normal PSK Certificates and
421 * Certificate Requests are omitted */
422 || (s
->s3
->tmp
.new_cipher
->algorithm_mkey
& SSL_kPSK
))
424 /* no cert request */
426 s
->s3
->tmp
.cert_request
=0;
427 s
->state
=SSL3_ST_SW_SRVR_DONE_A
;
431 s
->s3
->tmp
.cert_request
=1;
432 dtls1_start_timer(s
);
433 ret
=dtls1_send_certificate_request(s
);
434 if (ret
<= 0) goto end
;
435 #ifndef NETSCAPE_HANG_BUG
436 s
->state
=SSL3_ST_SW_SRVR_DONE_A
;
438 s
->state
=SSL3_ST_SW_FLUSH
;
439 s
->s3
->tmp
.next_state
=SSL3_ST_SR_CERT_A
;
445 case SSL3_ST_SW_SRVR_DONE_A
:
446 case SSL3_ST_SW_SRVR_DONE_B
:
447 dtls1_start_timer(s
);
448 ret
=dtls1_send_server_done(s
);
449 if (ret
<= 0) goto end
;
450 s
->s3
->tmp
.next_state
=SSL3_ST_SR_CERT_A
;
451 s
->state
=SSL3_ST_SW_FLUSH
;
455 case SSL3_ST_SW_FLUSH
:
456 s
->rwstate
=SSL_WRITING
;
457 if (BIO_flush(s
->wbio
) <= 0)
462 s
->rwstate
=SSL_NOTHING
;
463 s
->state
=s
->s3
->tmp
.next_state
;
466 case SSL3_ST_SR_CERT_A
:
467 case SSL3_ST_SR_CERT_B
:
468 /* Check for second client hello (MS SGC) */
469 ret
= ssl3_check_client_hello(s
);
474 s
->state
= SSL3_ST_SR_CLNT_HELLO_C
;
476 /* could be sent for a DH cert, even if we
477 * have not asked for it :-) */
478 ret
=ssl3_get_client_certificate(s
);
479 if (ret
<= 0) goto end
;
482 s
->state
=SSL3_ST_SR_KEY_EXCH_A
;
486 case SSL3_ST_SR_KEY_EXCH_A
:
487 case SSL3_ST_SR_KEY_EXCH_B
:
488 ret
=ssl3_get_client_key_exchange(s
);
489 if (ret
<= 0) goto end
;
491 s
->state
=SSL3_ST_SR_CERT_VRFY_A
;
496 /* For the ECDH ciphersuites when
497 * the client sends its ECDH pub key in
498 * a certificate, the CertificateVerify
499 * message is not sent.
501 s
->state
=SSL3_ST_SR_FINISHED_A
;
506 s
->state
=SSL3_ST_SR_CERT_VRFY_A
;
509 /* We need to get hashes here so if there is
510 * a client cert, it can be verified */
511 s
->method
->ssl3_enc
->cert_verify_mac(s
,
513 &(s
->s3
->tmp
.cert_verify_md
[0]));
514 s
->method
->ssl3_enc
->cert_verify_mac(s
,
516 &(s
->s3
->tmp
.cert_verify_md
[MD5_DIGEST_LENGTH
]));
520 case SSL3_ST_SR_CERT_VRFY_A
:
521 case SSL3_ST_SR_CERT_VRFY_B
:
523 s
->d1
->change_cipher_spec_ok
= 1;
524 /* we should decide if we expected this one */
525 ret
=ssl3_get_cert_verify(s
);
526 if (ret
<= 0) goto end
;
529 s
->state
=SSL3_ST_SR_FINISHED_A
;
533 case SSL3_ST_SR_FINISHED_A
:
534 case SSL3_ST_SR_FINISHED_B
:
535 s
->d1
->change_cipher_spec_ok
= 1;
536 ret
=ssl3_get_finished(s
,SSL3_ST_SR_FINISHED_A
,
537 SSL3_ST_SR_FINISHED_B
);
538 if (ret
<= 0) goto end
;
542 #ifndef OPENSSL_NO_TLSEXT
543 else if (s
->tlsext_ticket_expected
)
544 s
->state
=SSL3_ST_SW_SESSION_TICKET_A
;
547 s
->state
=SSL3_ST_SW_CHANGE_A
;
551 #ifndef OPENSSL_NO_TLSEXT
552 case SSL3_ST_SW_SESSION_TICKET_A
:
553 case SSL3_ST_SW_SESSION_TICKET_B
:
554 ret
=dtls1_send_newsession_ticket(s
);
555 if (ret
<= 0) goto end
;
556 s
->state
=SSL3_ST_SW_CHANGE_A
;
560 case SSL3_ST_SW_CERT_STATUS_A
:
561 case SSL3_ST_SW_CERT_STATUS_B
:
562 ret
=ssl3_send_cert_status(s
);
563 if (ret
<= 0) goto end
;
564 s
->state
=SSL3_ST_SW_KEY_EXCH_A
;
570 case SSL3_ST_SW_CHANGE_A
:
571 case SSL3_ST_SW_CHANGE_B
:
573 s
->session
->cipher
=s
->s3
->tmp
.new_cipher
;
574 if (!s
->method
->ssl3_enc
->setup_key_block(s
))
575 { ret
= -1; goto end
; }
577 ret
=dtls1_send_change_cipher_spec(s
,
578 SSL3_ST_SW_CHANGE_A
,SSL3_ST_SW_CHANGE_B
);
580 if (ret
<= 0) goto end
;
581 s
->state
=SSL3_ST_SW_FINISHED_A
;
584 if (!s
->method
->ssl3_enc
->change_cipher_state(s
,
585 SSL3_CHANGE_CIPHER_SERVER_WRITE
))
591 dtls1_reset_seq_numbers(s
, SSL3_CC_WRITE
);
594 case SSL3_ST_SW_FINISHED_A
:
595 case SSL3_ST_SW_FINISHED_B
:
596 ret
=dtls1_send_finished(s
,
597 SSL3_ST_SW_FINISHED_A
,SSL3_ST_SW_FINISHED_B
,
598 s
->method
->ssl3_enc
->server_finished_label
,
599 s
->method
->ssl3_enc
->server_finished_label_len
);
600 if (ret
<= 0) goto end
;
601 s
->state
=SSL3_ST_SW_FLUSH
;
603 s
->s3
->tmp
.next_state
=SSL3_ST_SR_FINISHED_A
;
605 s
->s3
->tmp
.next_state
=SSL_ST_OK
;
610 /* clean a few things up */
611 ssl3_cleanup_key_block(s
);
614 BUF_MEM_free(s
->init_buf
);
618 /* remove buffering on output */
619 ssl_free_wbio_buffer(s
);
623 if (s
->new_session
== 2) /* skipped if we just sent a HelloRequest */
625 /* actually not necessarily a 'new' session unless
626 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
630 ssl_update_cache(s
,SSL_SESS_CACHE_SERVER
);
632 s
->ctx
->stats
.sess_accept_good
++;
634 s
->handshake_func
=dtls1_accept
;
636 if (cb
!= NULL
) cb(s
,SSL_CB_HANDSHAKE_DONE
,1);
641 /* done handshaking, next message is client hello */
642 s
->d1
->handshake_read_seq
= 0;
643 /* next message is server hello */
644 s
->d1
->handshake_write_seq
= 0;
645 s
->d1
->next_handshake_write_seq
= 0;
650 SSLerr(SSL_F_DTLS1_ACCEPT
,SSL_R_UNKNOWN_STATE
);
656 if (!s
->s3
->tmp
.reuse_message
&& !skip
)
660 if ((ret
=BIO_flush(s
->wbio
)) <= 0)
665 if ((cb
!= NULL
) && (s
->state
!= state
))
669 cb(s
,SSL_CB_ACCEPT_LOOP
,1);
676 /* BIO_flush(s->wbio); */
680 cb(s
,SSL_CB_ACCEPT_EXIT
,ret
);
684 int dtls1_send_hello_request(SSL
*s
)
688 if (s
->state
== SSL3_ST_SW_HELLO_REQ_A
)
690 p
=(unsigned char *)s
->init_buf
->data
;
691 p
= dtls1_set_message_header(s
, p
, SSL3_MT_HELLO_REQUEST
, 0, 0, 0);
693 s
->state
=SSL3_ST_SW_HELLO_REQ_B
;
694 /* number of bytes to write */
695 s
->init_num
=DTLS1_HM_HEADER_LENGTH
;
698 /* no need to buffer this message, since there are no retransmit
702 /* SSL3_ST_SW_HELLO_REQ_B */
703 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
706 int dtls1_send_hello_verify_request(SSL
*s
)
708 unsigned int msg_len
;
709 unsigned char *msg
, *buf
, *p
;
711 if (s
->state
== DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A
)
713 buf
= (unsigned char *)s
->init_buf
->data
;
715 msg
= p
= &(buf
[DTLS1_HM_HEADER_LENGTH
]);
716 *(p
++) = s
->version
>> 8;
717 *(p
++) = s
->version
& 0xFF;
719 if (s
->ctx
->app_gen_cookie_cb
== NULL
||
720 s
->ctx
->app_gen_cookie_cb(s
, s
->d1
->cookie
,
721 &(s
->d1
->cookie_len
)) == 0)
723 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST
,ERR_R_INTERNAL_ERROR
);
727 *(p
++) = (unsigned char) s
->d1
->cookie_len
;
728 memcpy(p
, s
->d1
->cookie
, s
->d1
->cookie_len
);
729 p
+= s
->d1
->cookie_len
;
732 dtls1_set_message_header(s
, buf
,
733 DTLS1_MT_HELLO_VERIFY_REQUEST
, msg_len
, 0, msg_len
);
735 s
->state
=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B
;
736 /* number of bytes to write */
740 /* buffer the message to handle re-xmits */
741 dtls1_buffer_message(s
, 0);
744 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
745 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
748 int dtls1_send_server_hello(SSL
*s
)
754 unsigned long l
,Time
;
756 if (s
->state
== SSL3_ST_SW_SRVR_HELLO_A
)
758 buf
=(unsigned char *)s
->init_buf
->data
;
759 p
=s
->s3
->server_random
;
760 Time
=(unsigned long)time(NULL
); /* Time */
762 RAND_pseudo_bytes(p
,SSL3_RANDOM_SIZE
-sizeof(Time
));
763 /* Do the message type and length last */
764 d
=p
= &(buf
[DTLS1_HM_HEADER_LENGTH
]);
766 *(p
++)=s
->version
>>8;
767 *(p
++)=s
->version
&0xff;
770 memcpy(p
,s
->s3
->server_random
,SSL3_RANDOM_SIZE
);
773 /* now in theory we have 3 options to sending back the
774 * session id. If it is a re-use, we send back the
775 * old session-id, if it is a new session, we send
776 * back the new session-id or we send back a 0 length
777 * session-id if we want it to be single use.
778 * Currently I will not implement the '0' length session-id
779 * 12-Jan-98 - I'll now support the '0' length stuff.
781 if (!(s
->ctx
->session_cache_mode
& SSL_SESS_CACHE_SERVER
))
782 s
->session
->session_id_length
=0;
784 sl
=s
->session
->session_id_length
;
785 if (sl
> sizeof s
->session
->session_id
)
787 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO
, ERR_R_INTERNAL_ERROR
);
791 memcpy(p
,s
->session
->session_id
,sl
);
795 if (s
->s3
->tmp
.new_cipher
== NULL
)
797 i
=ssl3_put_cipher_by_char(s
->s3
->tmp
.new_cipher
,p
);
800 /* put the compression method */
801 #ifdef OPENSSL_NO_COMP
804 if (s
->s3
->tmp
.new_compression
== NULL
)
807 *(p
++)=s
->s3
->tmp
.new_compression
->id
;
810 #ifndef OPENSSL_NO_TLSEXT
811 if ((p
= ssl_add_serverhello_tlsext(s
, p
, buf
+SSL3_RT_MAX_PLAIN_LENGTH
)) == NULL
)
813 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO
,ERR_R_INTERNAL_ERROR
);
822 d
= dtls1_set_message_header(s
, d
, SSL3_MT_SERVER_HELLO
, l
, 0, l
);
824 s
->state
=SSL3_ST_SW_SRVR_HELLO_B
;
825 /* number of bytes to write */
829 /* buffer the message to handle re-xmits */
830 dtls1_buffer_message(s
, 0);
833 /* SSL3_ST_SW_SRVR_HELLO_B */
834 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
837 int dtls1_send_server_done(SSL
*s
)
841 if (s
->state
== SSL3_ST_SW_SRVR_DONE_A
)
843 p
=(unsigned char *)s
->init_buf
->data
;
846 p
= dtls1_set_message_header(s
, p
, SSL3_MT_SERVER_DONE
, 0, 0, 0);
848 s
->state
=SSL3_ST_SW_SRVR_DONE_B
;
849 /* number of bytes to write */
850 s
->init_num
=DTLS1_HM_HEADER_LENGTH
;
853 /* buffer the message to handle re-xmits */
854 dtls1_buffer_message(s
, 0);
857 /* SSL3_ST_SW_SRVR_DONE_B */
858 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
861 int dtls1_send_server_key_exchange(SSL
*s
)
863 #ifndef OPENSSL_NO_RSA
867 unsigned char md_buf
[MD5_DIGEST_LENGTH
+SHA_DIGEST_LENGTH
];
870 #ifndef OPENSSL_NO_DH
873 #ifndef OPENSSL_NO_ECDH
874 EC_KEY
*ecdh
=NULL
, *ecdhp
;
875 unsigned char *encodedPoint
= NULL
;
878 BN_CTX
*bn_ctx
= NULL
;
891 EVP_MD_CTX_init(&md_ctx
);
892 if (s
->state
== SSL3_ST_SW_KEY_EXCH_A
)
894 type
=s
->s3
->tmp
.new_cipher
->algorithm_mkey
;
899 r
[0]=r
[1]=r
[2]=r
[3]=NULL
;
901 #ifndef OPENSSL_NO_RSA
905 if ((rsa
== NULL
) && (s
->cert
->rsa_tmp_cb
!= NULL
))
907 rsa
=s
->cert
->rsa_tmp_cb(s
,
908 SSL_C_IS_EXPORT(s
->s3
->tmp
.new_cipher
),
909 SSL_C_EXPORT_PKEYLENGTH(s
->s3
->tmp
.new_cipher
));
912 al
=SSL_AD_HANDSHAKE_FAILURE
;
913 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_ERROR_GENERATING_TMP_RSA_KEY
);
921 al
=SSL_AD_HANDSHAKE_FAILURE
;
922 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_MISSING_TMP_RSA_KEY
);
927 s
->s3
->tmp
.use_rsa_tmp
=1;
931 #ifndef OPENSSL_NO_DH
935 if ((dhp
== NULL
) && (s
->cert
->dh_tmp_cb
!= NULL
))
936 dhp
=s
->cert
->dh_tmp_cb(s
,
937 SSL_C_IS_EXPORT(s
->s3
->tmp
.new_cipher
),
938 SSL_C_EXPORT_PKEYLENGTH(s
->s3
->tmp
.new_cipher
));
941 al
=SSL_AD_HANDSHAKE_FAILURE
;
942 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_MISSING_TMP_DH_KEY
);
946 if (s
->s3
->tmp
.dh
!= NULL
)
949 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
, ERR_R_INTERNAL_ERROR
);
953 if ((dh
=DHparams_dup(dhp
)) == NULL
)
955 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_R_DH_LIB
);
960 if ((dhp
->pub_key
== NULL
||
961 dhp
->priv_key
== NULL
||
962 (s
->options
& SSL_OP_SINGLE_DH_USE
)))
964 if(!DH_generate_key(dh
))
966 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,
973 dh
->pub_key
=BN_dup(dhp
->pub_key
);
974 dh
->priv_key
=BN_dup(dhp
->priv_key
);
975 if ((dh
->pub_key
== NULL
) ||
976 (dh
->priv_key
== NULL
))
978 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_R_DH_LIB
);
988 #ifndef OPENSSL_NO_ECDH
989 if (type
& SSL_kEECDH
)
991 const EC_GROUP
*group
;
993 ecdhp
=cert
->ecdh_tmp
;
994 if ((ecdhp
== NULL
) && (s
->cert
->ecdh_tmp_cb
!= NULL
))
996 ecdhp
=s
->cert
->ecdh_tmp_cb(s
,
997 SSL_C_IS_EXPORT(s
->s3
->tmp
.new_cipher
),
998 SSL_C_EXPORT_PKEYLENGTH(s
->s3
->tmp
.new_cipher
));
1002 al
=SSL_AD_HANDSHAKE_FAILURE
;
1003 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_MISSING_TMP_ECDH_KEY
);
1007 if (s
->s3
->tmp
.ecdh
!= NULL
)
1009 EC_KEY_free(s
->s3
->tmp
.ecdh
);
1010 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
, ERR_R_INTERNAL_ERROR
);
1014 /* Duplicate the ECDH structure. */
1017 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_R_ECDH_LIB
);
1020 if (!EC_KEY_up_ref(ecdhp
))
1022 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_R_ECDH_LIB
);
1027 s
->s3
->tmp
.ecdh
=ecdh
;
1028 if ((EC_KEY_get0_public_key(ecdh
) == NULL
) ||
1029 (EC_KEY_get0_private_key(ecdh
) == NULL
) ||
1030 (s
->options
& SSL_OP_SINGLE_ECDH_USE
))
1032 if(!EC_KEY_generate_key(ecdh
))
1034 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_R_ECDH_LIB
);
1039 if (((group
= EC_KEY_get0_group(ecdh
)) == NULL
) ||
1040 (EC_KEY_get0_public_key(ecdh
) == NULL
) ||
1041 (EC_KEY_get0_private_key(ecdh
) == NULL
))
1043 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_R_ECDH_LIB
);
1047 if (SSL_C_IS_EXPORT(s
->s3
->tmp
.new_cipher
) &&
1048 (EC_GROUP_get_degree(group
) > 163))
1050 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER
);
1054 /* XXX: For now, we only support ephemeral ECDH
1055 * keys over named (not generic) curves. For
1056 * supported named curves, curve_id is non-zero.
1059 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group
)))
1062 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE
);
1066 /* Encode the public key.
1067 * First check the size of encoding and
1068 * allocate memory accordingly.
1070 encodedlen
= EC_POINT_point2oct(group
,
1071 EC_KEY_get0_public_key(ecdh
),
1072 POINT_CONVERSION_UNCOMPRESSED
,
1075 encodedPoint
= (unsigned char *)
1076 OPENSSL_malloc(encodedlen
*sizeof(unsigned char));
1077 bn_ctx
= BN_CTX_new();
1078 if ((encodedPoint
== NULL
) || (bn_ctx
== NULL
))
1080 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_R_MALLOC_FAILURE
);
1085 encodedlen
= EC_POINT_point2oct(group
,
1086 EC_KEY_get0_public_key(ecdh
),
1087 POINT_CONVERSION_UNCOMPRESSED
,
1088 encodedPoint
, encodedlen
, bn_ctx
);
1090 if (encodedlen
== 0)
1092 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_R_ECDH_LIB
);
1096 BN_CTX_free(bn_ctx
); bn_ctx
=NULL
;
1098 /* XXX: For now, we only support named (not
1099 * generic) curves in ECDH ephemeral key exchanges.
1100 * In this situation, we need four additional bytes
1101 * to encode the entire ServerECDHParams
1106 /* We'll generate the serverKeyExchange message
1107 * explicitly so we can set these to NULLs
1115 #endif /* !OPENSSL_NO_ECDH */
1116 #ifndef OPENSSL_NO_PSK
1117 if (type
& SSL_kPSK
)
1119 /* reserve size for record length and PSK identity hint*/
1120 n
+=2+strlen(s
->ctx
->psk_identity_hint
);
1123 #endif /* !OPENSSL_NO_PSK */
1125 al
=SSL_AD_HANDSHAKE_FAILURE
;
1126 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE
);
1129 for (i
=0; r
[i
] != NULL
; i
++)
1131 nr
[i
]=BN_num_bytes(r
[i
]);
1135 if (!(s
->s3
->tmp
.new_cipher
->algorithm_auth
& SSL_aNULL
)
1136 && !(s
->s3
->tmp
.new_cipher
->algorithm_mkey
& SSL_kPSK
))
1138 if ((pkey
=ssl_get_sign_pkey(s
,s
->s3
->tmp
.new_cipher
))
1141 al
=SSL_AD_DECODE_ERROR
;
1144 kn
=EVP_PKEY_size(pkey
);
1152 if (!BUF_MEM_grow_clean(buf
,n
+DTLS1_HM_HEADER_LENGTH
+kn
))
1154 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_LIB_BUF
);
1157 d
=(unsigned char *)s
->init_buf
->data
;
1158 p
= &(d
[DTLS1_HM_HEADER_LENGTH
]);
1160 for (i
=0; r
[i
] != NULL
; i
++)
1167 #ifndef OPENSSL_NO_ECDH
1168 if (type
& SSL_kEECDH
)
1170 /* XXX: For now, we only support named (not generic) curves.
1171 * In this situation, the serverKeyExchange message has:
1172 * [1 byte CurveType], [2 byte CurveName]
1173 * [1 byte length of encoded point], followed by
1174 * the actual encoded point itself
1176 *p
= NAMED_CURVE_TYPE
;
1184 memcpy((unsigned char*)p
,
1185 (unsigned char *)encodedPoint
,
1187 OPENSSL_free(encodedPoint
);
1192 #ifndef OPENSSL_NO_PSK
1193 if (type
& SSL_kPSK
)
1195 /* copy PSK identity hint */
1196 s2n(strlen(s
->ctx
->psk_identity_hint
), p
);
1197 strncpy((char *)p
, s
->ctx
->psk_identity_hint
, strlen(s
->ctx
->psk_identity_hint
));
1198 p
+=strlen(s
->ctx
->psk_identity_hint
);
1205 /* n is the length of the params, they start at
1206 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1208 #ifndef OPENSSL_NO_RSA
1209 if (pkey
->type
== EVP_PKEY_RSA
)
1213 for (num
=2; num
> 0; num
--)
1215 EVP_DigestInit_ex(&md_ctx
,(num
== 2)
1216 ?s
->ctx
->md5
:s
->ctx
->sha1
, NULL
);
1217 EVP_DigestUpdate(&md_ctx
,&(s
->s3
->client_random
[0]),SSL3_RANDOM_SIZE
);
1218 EVP_DigestUpdate(&md_ctx
,&(s
->s3
->server_random
[0]),SSL3_RANDOM_SIZE
);
1219 EVP_DigestUpdate(&md_ctx
,&(d
[DTLS1_HM_HEADER_LENGTH
]),n
);
1220 EVP_DigestFinal_ex(&md_ctx
,q
,
1221 (unsigned int *)&i
);
1225 if (RSA_sign(NID_md5_sha1
, md_buf
, j
,
1226 &(p
[2]), &u
, pkey
->pkey
.rsa
) <= 0)
1228 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_LIB_RSA
);
1236 #if !defined(OPENSSL_NO_DSA)
1237 if (pkey
->type
== EVP_PKEY_DSA
)
1240 EVP_SignInit_ex(&md_ctx
,EVP_dss1(), NULL
);
1241 EVP_SignUpdate(&md_ctx
,&(s
->s3
->client_random
[0]),SSL3_RANDOM_SIZE
);
1242 EVP_SignUpdate(&md_ctx
,&(s
->s3
->server_random
[0]),SSL3_RANDOM_SIZE
);
1243 EVP_SignUpdate(&md_ctx
,&(d
[DTLS1_HM_HEADER_LENGTH
]),n
);
1244 if (!EVP_SignFinal(&md_ctx
,&(p
[2]),
1245 (unsigned int *)&i
,pkey
))
1247 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_LIB_DSA
);
1255 #if !defined(OPENSSL_NO_ECDSA)
1256 if (pkey
->type
== EVP_PKEY_EC
)
1258 /* let's do ECDSA */
1259 EVP_SignInit_ex(&md_ctx
,EVP_ecdsa(), 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
[4]),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_ECDSA
);
1275 /* Is this error check actually needed? */
1276 al
=SSL_AD_HANDSHAKE_FAILURE
;
1277 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_UNKNOWN_PKEY_TYPE
);
1282 d
= dtls1_set_message_header(s
, d
,
1283 SSL3_MT_SERVER_KEY_EXCHANGE
, n
, 0, n
);
1285 /* we should now have things packed up, so lets send
1287 s
->init_num
=n
+DTLS1_HM_HEADER_LENGTH
;
1290 /* buffer the message to handle re-xmits */
1291 dtls1_buffer_message(s
, 0);
1294 s
->state
= SSL3_ST_SW_KEY_EXCH_B
;
1295 EVP_MD_CTX_cleanup(&md_ctx
);
1296 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
1298 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
1300 #ifndef OPENSSL_NO_ECDH
1301 if (encodedPoint
!= NULL
) OPENSSL_free(encodedPoint
);
1302 BN_CTX_free(bn_ctx
);
1304 EVP_MD_CTX_cleanup(&md_ctx
);
1308 int dtls1_send_certificate_request(SSL
*s
)
1310 unsigned char *p
,*d
;
1312 STACK_OF(X509_NAME
) *sk
=NULL
;
1315 unsigned int msg_len
;
1317 if (s
->state
== SSL3_ST_SW_CERT_REQ_A
)
1321 d
=p
=(unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
]);
1323 /* get the list of acceptable cert types */
1325 n
=ssl3_get_req_cert_type(s
,p
);
1334 sk
=SSL_get_client_CA_list(s
);
1338 for (i
=0; i
<sk_X509_NAME_num(sk
); i
++)
1340 name
=sk_X509_NAME_value(sk
,i
);
1341 j
=i2d_X509_NAME(name
,NULL
);
1342 if (!BUF_MEM_grow_clean(buf
,DTLS1_HM_HEADER_LENGTH
+n
+j
+2))
1344 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST
,ERR_R_BUF_LIB
);
1347 p
=(unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
+n
]);
1348 if (!(s
->options
& SSL_OP_NETSCAPE_CA_DN_BUG
))
1351 i2d_X509_NAME(name
,&p
);
1358 i2d_X509_NAME(name
,&p
);
1359 j
-=2; s2n(j
,d
); j
+=2;
1365 /* else no CA names */
1366 p
=(unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
+off
]);
1369 d
=(unsigned char *)buf
->data
;
1370 *(d
++)=SSL3_MT_CERTIFICATE_REQUEST
;
1372 s2n(s
->d1
->handshake_write_seq
,d
);
1373 s
->d1
->handshake_write_seq
++;
1375 /* we should now have things packed up, so lets send
1378 s
->init_num
=n
+DTLS1_HM_HEADER_LENGTH
;
1380 #ifdef NETSCAPE_HANG_BUG
1381 /* XXX: what to do about this? */
1382 p
=(unsigned char *)s
->init_buf
->data
+ s
->init_num
;
1385 *(p
++)=SSL3_MT_SERVER_DONE
;
1392 /* XDTLS: set message header ? */
1393 msg_len
= s
->init_num
- DTLS1_HM_HEADER_LENGTH
;
1394 dtls1_set_message_header(s
, (void *)s
->init_buf
->data
,
1395 SSL3_MT_CERTIFICATE_REQUEST
, msg_len
, 0, msg_len
);
1397 /* buffer the message to handle re-xmits */
1398 dtls1_buffer_message(s
, 0);
1400 s
->state
= SSL3_ST_SW_CERT_REQ_B
;
1403 /* SSL3_ST_SW_CERT_REQ_B */
1404 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
1409 int dtls1_send_server_certificate(SSL
*s
)
1414 if (s
->state
== SSL3_ST_SW_CERT_A
)
1416 x
=ssl_get_server_send_cert(s
);
1419 /* VRS: allow null cert if auth == KRB5 */
1420 if ((s
->s3
->tmp
.new_cipher
->algorithm_mkey
!= SSL_kKRB5
) ||
1421 (s
->s3
->tmp
.new_cipher
->algorithm_auth
!= SSL_aKRB5
))
1423 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE
,ERR_R_INTERNAL_ERROR
);
1428 l
=dtls1_output_cert_chain(s
,x
);
1429 s
->state
=SSL3_ST_SW_CERT_B
;
1433 /* buffer the message to handle re-xmits */
1434 dtls1_buffer_message(s
, 0);
1437 /* SSL3_ST_SW_CERT_B */
1438 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
1441 #ifndef OPENSSL_NO_TLSEXT
1442 int dtls1_send_newsession_ticket(SSL
*s
)
1444 if (s
->state
== SSL3_ST_SW_SESSION_TICKET_A
)
1446 unsigned char *p
, *senc
, *macstart
;
1448 unsigned int hlen
, msg_len
;
1451 SSL_CTX
*tctx
= s
->initial_ctx
;
1452 unsigned char iv
[EVP_MAX_IV_LENGTH
];
1453 unsigned char key_name
[16];
1455 /* get session encoding length */
1456 slen
= i2d_SSL_SESSION(s
->session
, NULL
);
1457 /* Some length values are 16 bits, so forget it if session is
1462 /* Grow buffer if need be: the length calculation is as
1463 * follows 12 (DTLS handshake message header) +
1464 * 4 (ticket lifetime hint) + 2 (ticket length) +
1465 * 16 (key name) + max_iv_len (iv length) +
1466 * session_length + max_enc_block_size (max encrypted session
1467 * length) + max_md_size (HMAC).
1469 if (!BUF_MEM_grow(s
->init_buf
,
1470 DTLS1_HM_HEADER_LENGTH
+ 22 + EVP_MAX_IV_LENGTH
+
1471 EVP_MAX_BLOCK_LENGTH
+ EVP_MAX_MD_SIZE
+ slen
))
1473 senc
= OPENSSL_malloc(slen
);
1477 i2d_SSL_SESSION(s
->session
, &p
);
1479 p
=(unsigned char *)&(s
->init_buf
->data
[DTLS1_HM_HEADER_LENGTH
]);
1480 EVP_CIPHER_CTX_init(&ctx
);
1481 HMAC_CTX_init(&hctx
);
1482 /* Initialize HMAC and cipher contexts. If callback present
1483 * it does all the work otherwise use generated values
1486 if (tctx
->tlsext_ticket_key_cb
)
1488 if (tctx
->tlsext_ticket_key_cb(s
, key_name
, iv
, &ctx
,
1497 RAND_pseudo_bytes(iv
, 16);
1498 EVP_EncryptInit_ex(&ctx
, EVP_aes_128_cbc(), NULL
,
1499 tctx
->tlsext_tick_aes_key
, iv
);
1500 HMAC_Init_ex(&hctx
, tctx
->tlsext_tick_hmac_key
, 16,
1501 tlsext_tick_md(), NULL
);
1502 memcpy(key_name
, tctx
->tlsext_tick_key_name
, 16);
1504 l2n(s
->session
->tlsext_tick_lifetime_hint
, p
);
1505 /* Skip ticket length for now */
1507 /* Output key name */
1509 memcpy(p
, key_name
, 16);
1512 memcpy(p
, iv
, EVP_CIPHER_CTX_iv_length(&ctx
));
1513 p
+= EVP_CIPHER_CTX_iv_length(&ctx
);
1514 /* Encrypt session data */
1515 EVP_EncryptUpdate(&ctx
, p
, &len
, senc
, slen
);
1517 EVP_EncryptFinal(&ctx
, p
, &len
);
1519 EVP_CIPHER_CTX_cleanup(&ctx
);
1521 HMAC_Update(&hctx
, macstart
, p
- macstart
);
1522 HMAC_Final(&hctx
, p
, &hlen
);
1523 HMAC_CTX_cleanup(&hctx
);
1526 /* Now write out lengths: p points to end of data written */
1528 len
= p
- (unsigned char *)(s
->init_buf
->data
);
1530 p
=(unsigned char *)&(s
->init_buf
->data
[DTLS1_HM_HEADER_LENGTH
]) + 4;
1531 s2n(len
- DTLS1_HM_HEADER_LENGTH
- 6, p
);
1533 /* number of bytes to write */
1535 s
->state
=SSL3_ST_SW_SESSION_TICKET_B
;
1539 /* XDTLS: set message header ? */
1540 msg_len
= s
->init_num
- DTLS1_HM_HEADER_LENGTH
;
1541 dtls1_set_message_header(s
, (void *)s
->init_buf
->data
,
1542 SSL3_MT_NEWSESSION_TICKET
, msg_len
, 0, msg_len
);
1544 /* buffer the message to handle re-xmits */
1545 dtls1_buffer_message(s
, 0);
1548 /* SSL3_ST_SW_SESSION_TICKET_B */
1549 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));