3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2005 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 #ifndef OPENSSL_NO_DH
125 # include <openssl/dh.h>
128 static SSL_METHOD
*dtls1_get_server_method(int ver
);
129 static int dtls1_send_hello_verify_request(SSL
*s
);
131 static SSL_METHOD
*dtls1_get_server_method(int ver
)
133 if (ver
== DTLS1_VERSION
)
134 return (DTLSv1_server_method());
139 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method
,
141 ssl_undefined_function
, dtls1_get_server_method
)
143 int dtls1_accept(SSL
*s
)
146 unsigned long l
, Time
= (unsigned long)time(NULL
);
147 void (*cb
) (const SSL
*ssl
, int type
, int val
) = NULL
;
149 int new_state
, state
, skip
= 0;
152 RAND_add(&Time
, sizeof(Time
), 0);
156 if (s
->info_callback
!= NULL
)
157 cb
= s
->info_callback
;
158 else if (s
->ctx
->info_callback
!= NULL
)
159 cb
= s
->ctx
->info_callback
;
161 listen
= s
->d1
->listen
;
163 /* init things to blank */
165 if (!SSL_in_init(s
) || SSL_in_before(s
))
168 s
->d1
->listen
= listen
;
170 if (s
->cert
== NULL
) {
171 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
:
190 cb(s
, SSL_CB_HANDSHAKE_START
, 1);
192 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
) {
199 if ((buf
= BUF_MEM_new()) == NULL
) {
203 if (!BUF_MEM_grow(buf
, SSL3_RT_MAX_PLAIN_LENGTH
)) {
210 if (!ssl3_setup_buffers(s
)) {
217 if (s
->state
!= SSL_ST_RENEGOTIATE
) {
219 * Ok, we now need to push on a buffering BIO so that the
220 * output is sent in a way that TCP likes :-)
222 if (!ssl_init_wbio_buffer(s
, 1)) {
227 ssl3_init_finished_mac(s
);
228 s
->state
= SSL3_ST_SR_CLNT_HELLO_A
;
229 s
->ctx
->stats
.sess_accept
++;
232 * s->state == SSL_ST_RENEGOTIATE, we will just send a
235 s
->ctx
->stats
.sess_accept_renegotiate
++;
236 s
->state
= SSL3_ST_SW_HELLO_REQ_A
;
241 case SSL3_ST_SW_HELLO_REQ_A
:
242 case SSL3_ST_SW_HELLO_REQ_B
:
245 dtls1_clear_record_buffer(s
);
246 dtls1_start_timer(s
);
247 ret
= dtls1_send_hello_request(s
);
250 s
->s3
->tmp
.next_state
= SSL3_ST_SR_CLNT_HELLO_A
;
251 s
->state
= SSL3_ST_SW_FLUSH
;
254 ssl3_init_finished_mac(s
);
257 case SSL3_ST_SW_HELLO_REQ_C
:
258 s
->state
= SSL_ST_OK
;
261 case SSL3_ST_SR_CLNT_HELLO_A
:
262 case SSL3_ST_SR_CLNT_HELLO_B
:
263 case SSL3_ST_SR_CLNT_HELLO_C
:
266 ret
= ssl3_get_client_hello(s
);
271 if (ret
== 1 && (SSL_get_options(s
) & SSL_OP_COOKIE_EXCHANGE
))
272 s
->state
= DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A
;
274 s
->state
= SSL3_ST_SW_SRVR_HELLO_A
;
279 * Reflect ClientHello sequence to remain stateless while
283 memcpy(s
->s3
->write_sequence
, s
->s3
->read_sequence
,
284 sizeof(s
->s3
->write_sequence
));
287 /* If we're just listening, stop here */
288 if (listen
&& s
->state
== SSL3_ST_SW_SRVR_HELLO_A
) {
292 * Set expected sequence numbers to continue the handshake.
294 s
->d1
->handshake_read_seq
= 2;
295 s
->d1
->handshake_write_seq
= 1;
296 s
->d1
->next_handshake_write_seq
= 1;
302 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A
:
303 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B
:
305 ret
= dtls1_send_hello_verify_request(s
);
308 s
->state
= SSL3_ST_SW_FLUSH
;
309 s
->s3
->tmp
.next_state
= SSL3_ST_SR_CLNT_HELLO_A
;
311 /* HelloVerifyRequests resets Finished MAC */
312 if (s
->client_version
!= DTLS1_BAD_VER
)
313 ssl3_init_finished_mac(s
);
316 case SSL3_ST_SW_SRVR_HELLO_A
:
317 case SSL3_ST_SW_SRVR_HELLO_B
:
319 dtls1_start_timer(s
);
320 ret
= dtls1_send_server_hello(s
);
324 #ifndef OPENSSL_NO_TLSEXT
326 if (s
->tlsext_ticket_expected
)
327 s
->state
= SSL3_ST_SW_SESSION_TICKET_A
;
329 s
->state
= SSL3_ST_SW_CHANGE_A
;
333 s
->state
= SSL3_ST_SW_CHANGE_A
;
336 s
->state
= SSL3_ST_SW_CERT_A
;
340 case SSL3_ST_SW_CERT_A
:
341 case SSL3_ST_SW_CERT_B
:
342 /* Check if it is anon DH */
343 if (!(s
->s3
->tmp
.new_cipher
->algorithms
& SSL_aNULL
)) {
344 dtls1_start_timer(s
);
345 ret
= dtls1_send_server_certificate(s
);
348 #ifndef OPENSSL_NO_TLSEXT
349 if (s
->tlsext_status_expected
)
350 s
->state
= SSL3_ST_SW_CERT_STATUS_A
;
352 s
->state
= SSL3_ST_SW_KEY_EXCH_A
;
355 s
->state
= SSL3_ST_SW_KEY_EXCH_A
;
361 s
->state
= SSL3_ST_SW_KEY_EXCH_A
;
366 case SSL3_ST_SW_KEY_EXCH_A
:
367 case SSL3_ST_SW_KEY_EXCH_B
:
368 l
= s
->s3
->tmp
.new_cipher
->algorithms
;
371 * clear this, it may get reset by send_server_key_exchange
373 s
->s3
->tmp
.use_rsa_tmp
= 0;
376 * only send if a DH key exchange, fortezza or RSA but we have a
377 * sign only certificate
379 if ((l
& (SSL_DH
| SSL_kFZA
))
381 && (s
->cert
->pkeys
[SSL_PKEY_RSA_ENC
].privatekey
== NULL
382 || (SSL_C_IS_EXPORT(s
->s3
->tmp
.new_cipher
)
383 && EVP_PKEY_size(s
->cert
->pkeys
384 [SSL_PKEY_RSA_ENC
].privatekey
) *
385 8 > SSL_C_EXPORT_PKEYLENGTH(s
->s3
->tmp
.new_cipher
)
390 dtls1_start_timer(s
);
391 ret
= dtls1_send_server_key_exchange(s
);
397 s
->state
= SSL3_ST_SW_CERT_REQ_A
;
401 case SSL3_ST_SW_CERT_REQ_A
:
402 case SSL3_ST_SW_CERT_REQ_B
:
403 if ( /* don't request cert unless asked for it: */
404 !(s
->verify_mode
& SSL_VERIFY_PEER
) ||
406 * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
407 * during re-negotiation:
409 ((s
->session
->peer
!= NULL
) &&
410 (s
->verify_mode
& SSL_VERIFY_CLIENT_ONCE
)) ||
412 * never request cert in anonymous ciphersuites (see
413 * section "Certificate request" in SSL 3 drafts and in
416 ((s
->s3
->tmp
.new_cipher
->algorithms
& SSL_aNULL
) &&
418 * ... except when the application insists on
419 * verification (against the specs, but s3_clnt.c accepts
422 !(s
->verify_mode
& SSL_VERIFY_FAIL_IF_NO_PEER_CERT
)) ||
424 * never request cert in Kerberos ciphersuites
426 (s
->s3
->tmp
.new_cipher
->algorithms
& SSL_aKRB5
)) {
427 /* no cert request */
429 s
->s3
->tmp
.cert_request
= 0;
430 s
->state
= SSL3_ST_SW_SRVR_DONE_A
;
432 s
->s3
->tmp
.cert_request
= 1;
433 dtls1_start_timer(s
);
434 ret
= dtls1_send_certificate_request(s
);
437 #ifndef NETSCAPE_HANG_BUG
438 s
->state
= SSL3_ST_SW_SRVR_DONE_A
;
440 s
->state
= SSL3_ST_SW_FLUSH
;
441 s
->s3
->tmp
.next_state
= SSL3_ST_SR_CERT_A
;
447 case SSL3_ST_SW_SRVR_DONE_A
:
448 case SSL3_ST_SW_SRVR_DONE_B
:
449 dtls1_start_timer(s
);
450 ret
= dtls1_send_server_done(s
);
453 s
->s3
->tmp
.next_state
= SSL3_ST_SR_CERT_A
;
454 s
->state
= SSL3_ST_SW_FLUSH
;
458 case SSL3_ST_SW_FLUSH
:
459 s
->rwstate
= SSL_WRITING
;
460 if (BIO_flush(s
->wbio
) <= 0) {
464 s
->rwstate
= SSL_NOTHING
;
465 s
->state
= s
->s3
->tmp
.next_state
;
468 case SSL3_ST_SR_CERT_A
:
469 case SSL3_ST_SR_CERT_B
:
470 /* Check for second client hello (MS SGC) */
471 ret
= ssl3_check_client_hello(s
);
476 s
->state
= SSL3_ST_SR_CLNT_HELLO_C
;
478 if (s
->s3
->tmp
.cert_request
) {
479 ret
= ssl3_get_client_certificate(s
);
484 s
->state
= SSL3_ST_SR_KEY_EXCH_A
;
488 case SSL3_ST_SR_KEY_EXCH_A
:
489 case SSL3_ST_SR_KEY_EXCH_B
:
490 ret
= ssl3_get_client_key_exchange(s
);
493 s
->state
= SSL3_ST_SR_CERT_VRFY_A
;
497 * We need to get hashes here so if there is a client cert, it
500 s
->method
->ssl3_enc
->cert_verify_mac(s
,
501 &(s
->s3
->finish_dgst1
),
503 tmp
.cert_verify_md
[0]));
504 s
->method
->ssl3_enc
->cert_verify_mac(s
, &(s
->s3
->finish_dgst2
),
507 [MD5_DIGEST_LENGTH
]));
511 case SSL3_ST_SR_CERT_VRFY_A
:
512 case SSL3_ST_SR_CERT_VRFY_B
:
514 s
->d1
->change_cipher_spec_ok
= 1;
515 /* we should decide if we expected this one */
516 ret
= ssl3_get_cert_verify(s
);
520 s
->state
= SSL3_ST_SR_FINISHED_A
;
524 case SSL3_ST_SR_FINISHED_A
:
525 case SSL3_ST_SR_FINISHED_B
:
526 s
->d1
->change_cipher_spec_ok
= 1;
527 ret
= ssl3_get_finished(s
, SSL3_ST_SR_FINISHED_A
,
528 SSL3_ST_SR_FINISHED_B
);
533 s
->state
= SSL_ST_OK
;
534 #ifndef OPENSSL_NO_TLSEXT
535 else if (s
->tlsext_ticket_expected
)
536 s
->state
= SSL3_ST_SW_SESSION_TICKET_A
;
539 s
->state
= SSL3_ST_SW_CHANGE_A
;
543 #ifndef OPENSSL_NO_TLSEXT
544 case SSL3_ST_SW_SESSION_TICKET_A
:
545 case SSL3_ST_SW_SESSION_TICKET_B
:
546 ret
= dtls1_send_newsession_ticket(s
);
549 s
->state
= SSL3_ST_SW_CHANGE_A
;
553 case SSL3_ST_SW_CERT_STATUS_A
:
554 case SSL3_ST_SW_CERT_STATUS_B
:
555 ret
= ssl3_send_cert_status(s
);
558 s
->state
= SSL3_ST_SW_KEY_EXCH_A
;
564 case SSL3_ST_SW_CHANGE_A
:
565 case SSL3_ST_SW_CHANGE_B
:
567 s
->session
->cipher
= s
->s3
->tmp
.new_cipher
;
568 if (!s
->method
->ssl3_enc
->setup_key_block(s
)) {
573 ret
= dtls1_send_change_cipher_spec(s
,
575 SSL3_ST_SW_CHANGE_B
);
579 s
->state
= SSL3_ST_SW_FINISHED_A
;
582 if (!s
->method
->ssl3_enc
->change_cipher_state(s
,
583 SSL3_CHANGE_CIPHER_SERVER_WRITE
))
589 dtls1_reset_seq_numbers(s
, SSL3_CC_WRITE
);
592 case SSL3_ST_SW_FINISHED_A
:
593 case SSL3_ST_SW_FINISHED_B
:
594 ret
= dtls1_send_finished(s
,
595 SSL3_ST_SW_FINISHED_A
,
596 SSL3_ST_SW_FINISHED_B
,
598 ssl3_enc
->server_finished_label
,
600 ssl3_enc
->server_finished_label_len
);
603 s
->state
= SSL3_ST_SW_FLUSH
;
605 s
->s3
->tmp
.next_state
= SSL3_ST_SR_FINISHED_A
;
607 s
->s3
->tmp
.next_state
= SSL_ST_OK
;
612 /* clean a few things up */
613 ssl3_cleanup_key_block(s
);
616 BUF_MEM_free(s
->init_buf
);
620 /* remove buffering on output */
621 ssl_free_wbio_buffer(s
);
625 if (s
->new_session
== 2) { /* skipped if we just sent a
628 * actually not necessarily a 'new' session unless
629 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set
634 ssl_update_cache(s
, SSL_SESS_CACHE_SERVER
);
636 s
->ctx
->stats
.sess_accept_good
++;
638 s
->handshake_func
= dtls1_accept
;
641 cb(s
, SSL_CB_HANDSHAKE_DONE
, 1);
646 /* done handshaking, next message is client hello */
647 s
->d1
->handshake_read_seq
= 0;
648 /* next message is server hello */
649 s
->d1
->handshake_write_seq
= 0;
650 s
->d1
->next_handshake_write_seq
= 0;
655 SSLerr(SSL_F_DTLS1_ACCEPT
, SSL_R_UNKNOWN_STATE
);
661 if (!s
->s3
->tmp
.reuse_message
&& !skip
) {
663 if ((ret
= BIO_flush(s
->wbio
)) <= 0)
667 if ((cb
!= NULL
) && (s
->state
!= state
)) {
668 new_state
= s
->state
;
670 cb(s
, SSL_CB_ACCEPT_LOOP
, 1);
671 s
->state
= new_state
;
677 /* BIO_flush(s->wbio); */
681 cb(s
, SSL_CB_ACCEPT_EXIT
, ret
);
685 int dtls1_send_hello_request(SSL
*s
)
689 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
;
699 * no need to buffer this message, since there are no retransmit
704 /* SSL3_ST_SW_HELLO_REQ_B */
705 return (dtls1_do_write(s
, SSL3_RT_HANDSHAKE
));
708 int dtls1_send_hello_verify_request(SSL
*s
)
710 unsigned int msg_len
;
711 unsigned char *msg
, *buf
, *p
;
713 if (s
->state
== DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A
) {
714 buf
= (unsigned char *)s
->init_buf
->data
;
716 msg
= p
= &(buf
[DTLS1_HM_HEADER_LENGTH
]);
717 if (s
->client_version
== DTLS1_BAD_VER
)
718 *(p
++) = DTLS1_BAD_VER
>> 8, *(p
++) = DTLS1_BAD_VER
& 0xff;
720 *(p
++) = s
->version
>> 8, *(p
++) = s
->version
& 0xFF;
722 if (s
->ctx
->app_gen_cookie_cb
== NULL
||
723 s
->ctx
->app_gen_cookie_cb(s
, s
->d1
->cookie
,
724 &(s
->d1
->cookie_len
)) == 0) {
725 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST
,
726 ERR_R_INTERNAL_ERROR
);
730 *(p
++) = (unsigned char)s
->d1
->cookie_len
;
731 memcpy(p
, s
->d1
->cookie
, s
->d1
->cookie_len
);
732 p
+= s
->d1
->cookie_len
;
735 dtls1_set_message_header(s
, buf
,
736 DTLS1_MT_HELLO_VERIFY_REQUEST
, msg_len
, 0,
739 s
->state
= DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B
;
740 /* number of bytes to write */
741 s
->init_num
= p
- buf
;
745 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
746 return (dtls1_do_write(s
, SSL3_RT_HANDSHAKE
));
749 int dtls1_send_server_hello(SSL
*s
)
752 unsigned char *p
, *d
;
755 unsigned long l
, Time
;
757 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
- 4);
763 /* Do the message type and length last */
764 d
= p
= &(buf
[DTLS1_HM_HEADER_LENGTH
]);
766 if (s
->client_version
== DTLS1_BAD_VER
)
767 *(p
++) = DTLS1_BAD_VER
>> 8, *(p
++) = DTLS1_BAD_VER
& 0xff;
769 *(p
++) = s
->version
>> 8, *(p
++) = s
->version
& 0xff;
772 memcpy(p
, s
->s3
->server_random
, SSL3_RANDOM_SIZE
);
773 p
+= SSL3_RANDOM_SIZE
;
776 * now in theory we have 3 options to sending back the session id.
777 * If it is a re-use, we send back the old session-id, if it is a new
778 * session, we send back the new session-id or we send back a 0
779 * length session-id if we want it to be single use. Currently I will
780 * not implement the '0' length session-id 12-Jan-98 - I'll now
781 * support the '0' length stuff.
783 if (!(s
->ctx
->session_cache_mode
& SSL_SESS_CACHE_SERVER
))
784 s
->session
->session_id_length
= 0;
786 sl
= s
->session
->session_id_length
;
787 if (sl
> sizeof s
->session
->session_id
) {
788 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO
, ERR_R_INTERNAL_ERROR
);
792 memcpy(p
, s
->session
->session_id
, sl
);
796 if (s
->s3
->tmp
.new_cipher
== NULL
)
798 i
= ssl3_put_cipher_by_char(s
->s3
->tmp
.new_cipher
, p
);
801 /* put the compression method */
802 #ifdef OPENSSL_NO_COMP
805 if (s
->s3
->tmp
.new_compression
== NULL
)
808 *(p
++) = s
->s3
->tmp
.new_compression
->id
;
811 #ifndef OPENSSL_NO_TLSEXT
813 ssl_add_serverhello_tlsext(s
, p
,
814 buf
+ SSL3_RT_MAX_PLAIN_LENGTH
)) ==
816 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO
, ERR_R_INTERNAL_ERROR
);
825 d
= dtls1_set_message_header(s
, d
, SSL3_MT_SERVER_HELLO
, l
, 0, l
);
827 s
->state
= SSL3_ST_SW_SRVR_HELLO_B
;
828 /* number of bytes to write */
829 s
->init_num
= p
- buf
;
832 /* buffer the message to handle re-xmits */
833 dtls1_buffer_message(s
, 0);
836 /* SSL3_ST_SW_SRVR_HELLO_B */
837 return (dtls1_do_write(s
, SSL3_RT_HANDSHAKE
));
840 int dtls1_send_server_done(SSL
*s
)
844 if (s
->state
== SSL3_ST_SW_SRVR_DONE_A
) {
845 p
= (unsigned char *)s
->init_buf
->data
;
848 p
= dtls1_set_message_header(s
, p
, SSL3_MT_SERVER_DONE
, 0, 0, 0);
850 s
->state
= SSL3_ST_SW_SRVR_DONE_B
;
851 /* number of bytes to write */
852 s
->init_num
= DTLS1_HM_HEADER_LENGTH
;
855 /* buffer the message to handle re-xmits */
856 dtls1_buffer_message(s
, 0);
859 /* SSL3_ST_SW_SRVR_DONE_B */
860 return (dtls1_do_write(s
, SSL3_RT_HANDSHAKE
));
863 int dtls1_send_server_key_exchange(SSL
*s
)
865 #ifndef OPENSSL_NO_RSA
869 unsigned char md_buf
[MD5_DIGEST_LENGTH
+ SHA_DIGEST_LENGTH
];
872 #ifndef OPENSSL_NO_DH
876 unsigned char *p
, *d
;
886 EVP_MD_CTX_init(&md_ctx
);
887 if (s
->state
== SSL3_ST_SW_KEY_EXCH_A
) {
888 type
= s
->s3
->tmp
.new_cipher
->algorithms
& SSL_MKEY_MASK
;
893 r
[0] = r
[1] = r
[2] = r
[3] = NULL
;
895 #ifndef OPENSSL_NO_RSA
896 if (type
& SSL_kRSA
) {
898 if ((rsa
== NULL
) && (s
->cert
->rsa_tmp_cb
!= NULL
)) {
899 rsa
= s
->cert
->rsa_tmp_cb(s
,
900 SSL_C_IS_EXPORT(s
->s3
->
902 SSL_C_EXPORT_PKEYLENGTH(s
->s3
->
905 al
= SSL_AD_HANDSHAKE_FAILURE
;
906 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,
907 SSL_R_ERROR_GENERATING_TMP_RSA_KEY
);
914 al
= SSL_AD_HANDSHAKE_FAILURE
;
915 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,
916 SSL_R_MISSING_TMP_RSA_KEY
);
921 s
->s3
->tmp
.use_rsa_tmp
= 1;
924 #ifndef OPENSSL_NO_DH
925 if (type
& SSL_kEDH
) {
927 if ((dhp
== NULL
) && (s
->cert
->dh_tmp_cb
!= NULL
))
928 dhp
= s
->cert
->dh_tmp_cb(s
,
929 SSL_C_IS_EXPORT(s
->s3
->
931 SSL_C_EXPORT_PKEYLENGTH(s
->s3
->
934 al
= SSL_AD_HANDSHAKE_FAILURE
;
935 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,
936 SSL_R_MISSING_TMP_DH_KEY
);
940 if (s
->s3
->tmp
.dh
!= NULL
) {
942 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,
943 ERR_R_INTERNAL_ERROR
);
947 if ((dh
= DHparams_dup(dhp
)) == NULL
) {
948 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
, ERR_R_DH_LIB
);
953 if ((dhp
->pub_key
== NULL
||
954 dhp
->priv_key
== NULL
||
955 (s
->options
& SSL_OP_SINGLE_DH_USE
))) {
956 if (!DH_generate_key(dh
)) {
957 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,
962 dh
->pub_key
= BN_dup(dhp
->pub_key
);
963 dh
->priv_key
= BN_dup(dhp
->priv_key
);
964 if ((dh
->pub_key
== NULL
) || (dh
->priv_key
== NULL
)) {
965 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,
976 al
= SSL_AD_HANDSHAKE_FAILURE
;
977 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,
978 SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE
);
981 for (i
= 0; r
[i
] != NULL
; i
++) {
982 nr
[i
] = BN_num_bytes(r
[i
]);
986 if (!(s
->s3
->tmp
.new_cipher
->algorithms
& SSL_aNULL
)) {
987 if ((pkey
= ssl_get_sign_pkey(s
, s
->s3
->tmp
.new_cipher
))
989 al
= SSL_AD_DECODE_ERROR
;
992 kn
= EVP_PKEY_size(pkey
);
998 if (!BUF_MEM_grow_clean(buf
, n
+ DTLS1_HM_HEADER_LENGTH
+ kn
)) {
999 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
, ERR_LIB_BUF
);
1002 d
= (unsigned char *)s
->init_buf
->data
;
1003 p
= &(d
[DTLS1_HM_HEADER_LENGTH
]);
1005 for (i
= 0; r
[i
] != NULL
; i
++) {
1014 * n is the length of the params, they start at
1015 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space at the
1018 #ifndef OPENSSL_NO_RSA
1019 if (pkey
->type
== EVP_PKEY_RSA
) {
1022 for (num
= 2; num
> 0; num
--) {
1023 EVP_DigestInit_ex(&md_ctx
, (num
== 2)
1024 ? s
->ctx
->md5
: s
->ctx
->sha1
, NULL
);
1025 EVP_DigestUpdate(&md_ctx
, &(s
->s3
->client_random
[0]),
1027 EVP_DigestUpdate(&md_ctx
, &(s
->s3
->server_random
[0]),
1029 EVP_DigestUpdate(&md_ctx
, &(d
[DTLS1_HM_HEADER_LENGTH
]),
1031 EVP_DigestFinal_ex(&md_ctx
, q
, (unsigned int *)&i
);
1035 if (RSA_sign(NID_md5_sha1
, md_buf
, j
,
1036 &(p
[2]), &u
, pkey
->pkey
.rsa
) <= 0) {
1037 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
, ERR_LIB_RSA
);
1044 #if !defined(OPENSSL_NO_DSA)
1045 if (pkey
->type
== EVP_PKEY_DSA
) {
1047 EVP_SignInit_ex(&md_ctx
, EVP_dss1(), NULL
);
1048 EVP_SignUpdate(&md_ctx
, &(s
->s3
->client_random
[0]),
1050 EVP_SignUpdate(&md_ctx
, &(s
->s3
->server_random
[0]),
1052 EVP_SignUpdate(&md_ctx
, &(d
[DTLS1_HM_HEADER_LENGTH
]), n
);
1053 if (!EVP_SignFinal(&md_ctx
, &(p
[2]),
1054 (unsigned int *)&i
, pkey
)) {
1055 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
, ERR_LIB_DSA
);
1063 /* Is this error check actually needed? */
1064 al
= SSL_AD_HANDSHAKE_FAILURE
;
1065 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,
1066 SSL_R_UNKNOWN_PKEY_TYPE
);
1071 d
= dtls1_set_message_header(s
, d
,
1072 SSL3_MT_SERVER_KEY_EXCHANGE
, n
, 0, n
);
1075 * we should now have things packed up, so lets send it off
1077 s
->init_num
= n
+ DTLS1_HM_HEADER_LENGTH
;
1080 /* buffer the message to handle re-xmits */
1081 dtls1_buffer_message(s
, 0);
1084 s
->state
= SSL3_ST_SW_KEY_EXCH_B
;
1085 EVP_MD_CTX_cleanup(&md_ctx
);
1086 return (dtls1_do_write(s
, SSL3_RT_HANDSHAKE
));
1088 ssl3_send_alert(s
, SSL3_AL_FATAL
, al
);
1090 EVP_MD_CTX_cleanup(&md_ctx
);
1094 int dtls1_send_certificate_request(SSL
*s
)
1096 unsigned char *p
, *d
;
1097 int i
, j
, nl
, off
, n
;
1098 STACK_OF(X509_NAME
) *sk
= NULL
;
1101 unsigned int msg_len
;
1103 if (s
->state
== SSL3_ST_SW_CERT_REQ_A
) {
1106 d
= p
= (unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
]);
1108 /* get the list of acceptable cert types */
1110 n
= ssl3_get_req_cert_type(s
, p
);
1119 sk
= SSL_get_client_CA_list(s
);
1122 for (i
= 0; i
< sk_X509_NAME_num(sk
); i
++) {
1123 name
= sk_X509_NAME_value(sk
, i
);
1124 j
= i2d_X509_NAME(name
, NULL
);
1125 if (!BUF_MEM_grow_clean
1126 (buf
, DTLS1_HM_HEADER_LENGTH
+ n
+ j
+ 2)) {
1127 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST
,
1131 p
= (unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
+ n
]);
1132 if (!(s
->options
& SSL_OP_NETSCAPE_CA_DN_BUG
)) {
1134 i2d_X509_NAME(name
, &p
);
1139 i2d_X509_NAME(name
, &p
);
1148 /* else no CA names */
1149 p
= (unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
+ off
]);
1152 d
= (unsigned char *)buf
->data
;
1153 *(d
++) = SSL3_MT_CERTIFICATE_REQUEST
;
1155 s2n(s
->d1
->handshake_write_seq
, d
);
1156 s
->d1
->handshake_write_seq
++;
1159 * we should now have things packed up, so lets send it off
1162 s
->init_num
= n
+ DTLS1_HM_HEADER_LENGTH
;
1164 #ifdef NETSCAPE_HANG_BUG
1165 /* XXX: what to do about this? */
1166 p
= (unsigned char *)s
->init_buf
->data
+ s
->init_num
;
1169 *(p
++) = SSL3_MT_SERVER_DONE
;
1176 /* XDTLS: set message header ? */
1177 msg_len
= s
->init_num
- DTLS1_HM_HEADER_LENGTH
;
1178 dtls1_set_message_header(s
, (void *)s
->init_buf
->data
,
1179 SSL3_MT_CERTIFICATE_REQUEST
, msg_len
, 0,
1182 /* buffer the message to handle re-xmits */
1183 dtls1_buffer_message(s
, 0);
1185 s
->state
= SSL3_ST_SW_CERT_REQ_B
;
1188 /* SSL3_ST_SW_CERT_REQ_B */
1189 return (dtls1_do_write(s
, SSL3_RT_HANDSHAKE
));
1194 int dtls1_send_server_certificate(SSL
*s
)
1199 if (s
->state
== SSL3_ST_SW_CERT_A
) {
1200 x
= ssl_get_server_send_cert(s
);
1202 /* VRS: allow null cert if auth == KRB5 */
1203 (s
->s3
->tmp
.new_cipher
->algorithms
1204 & (SSL_MKEY_MASK
| SSL_AUTH_MASK
))
1205 != (SSL_aKRB5
| SSL_kKRB5
)) {
1206 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE
, ERR_R_INTERNAL_ERROR
);
1210 l
= dtls1_output_cert_chain(s
, x
);
1211 s
->state
= SSL3_ST_SW_CERT_B
;
1212 s
->init_num
= (int)l
;
1215 /* buffer the message to handle re-xmits */
1216 dtls1_buffer_message(s
, 0);
1219 /* SSL3_ST_SW_CERT_B */
1220 return (dtls1_do_write(s
, SSL3_RT_HANDSHAKE
));
1223 #ifndef OPENSSL_NO_TLSEXT
1224 int dtls1_send_newsession_ticket(SSL
*s
)
1226 if (s
->state
== SSL3_ST_SW_SESSION_TICKET_A
) {
1227 unsigned char *p
, *senc
, *macstart
;
1229 unsigned int hlen
, msg_len
;
1232 SSL_CTX
*tctx
= s
->initial_ctx
;
1233 unsigned char iv
[EVP_MAX_IV_LENGTH
];
1234 unsigned char key_name
[16];
1236 /* get session encoding length */
1237 slen
= i2d_SSL_SESSION(s
->session
, NULL
);
1239 * Some length values are 16 bits, so forget it if session is too
1245 * Grow buffer if need be: the length calculation is as follows 12
1246 * (DTLS handshake message header) + 4 (ticket lifetime hint) + 2
1247 * (ticket length) + 16 (key name) + max_iv_len (iv length) +
1248 * session_length + max_enc_block_size (max encrypted session length)
1249 * + max_md_size (HMAC).
1251 if (!BUF_MEM_grow(s
->init_buf
,
1252 DTLS1_HM_HEADER_LENGTH
+ 22 + EVP_MAX_IV_LENGTH
+
1253 EVP_MAX_BLOCK_LENGTH
+ EVP_MAX_MD_SIZE
+ slen
))
1255 senc
= OPENSSL_malloc(slen
);
1259 i2d_SSL_SESSION(s
->session
, &p
);
1261 p
= (unsigned char *)&(s
->init_buf
->data
[DTLS1_HM_HEADER_LENGTH
]);
1262 EVP_CIPHER_CTX_init(&ctx
);
1263 HMAC_CTX_init(&hctx
);
1265 * Initialize HMAC and cipher contexts. If callback present it does
1266 * all the work otherwise use generated values from parent ctx.
1268 if (tctx
->tlsext_ticket_key_cb
) {
1269 if (tctx
->tlsext_ticket_key_cb(s
, key_name
, iv
, &ctx
,
1275 RAND_pseudo_bytes(iv
, 16);
1276 EVP_EncryptInit_ex(&ctx
, EVP_aes_128_cbc(), NULL
,
1277 tctx
->tlsext_tick_aes_key
, iv
);
1278 HMAC_Init_ex(&hctx
, tctx
->tlsext_tick_hmac_key
, 16,
1279 tlsext_tick_md(), NULL
);
1280 memcpy(key_name
, tctx
->tlsext_tick_key_name
, 16);
1282 l2n(s
->session
->tlsext_tick_lifetime_hint
, p
);
1283 /* Skip ticket length for now */
1285 /* Output key name */
1287 memcpy(p
, key_name
, 16);
1290 memcpy(p
, iv
, EVP_CIPHER_CTX_iv_length(&ctx
));
1291 p
+= EVP_CIPHER_CTX_iv_length(&ctx
);
1292 /* Encrypt session data */
1293 EVP_EncryptUpdate(&ctx
, p
, &len
, senc
, slen
);
1295 EVP_EncryptFinal(&ctx
, p
, &len
);
1297 EVP_CIPHER_CTX_cleanup(&ctx
);
1299 HMAC_Update(&hctx
, macstart
, p
- macstart
);
1300 HMAC_Final(&hctx
, p
, &hlen
);
1301 HMAC_CTX_cleanup(&hctx
);
1304 /* Now write out lengths: p points to end of data written */
1306 len
= p
- (unsigned char *)(s
->init_buf
->data
);
1308 p
= (unsigned char *)&(s
->init_buf
->data
[DTLS1_HM_HEADER_LENGTH
]) + 4;
1309 s2n(len
- DTLS1_HM_HEADER_LENGTH
- 6, p
);
1311 /* number of bytes to write */
1313 s
->state
= SSL3_ST_SW_SESSION_TICKET_B
;
1317 /* XDTLS: set message header ? */
1318 msg_len
= s
->init_num
- DTLS1_HM_HEADER_LENGTH
;
1319 dtls1_set_message_header(s
, (void *)s
->init_buf
->data
,
1320 SSL3_MT_NEWSESSION_TICKET
, msg_len
, 0,
1323 /* buffer the message to handle re-xmits */
1324 dtls1_buffer_message(s
, 0);
1327 /* SSL3_ST_SW_SESSION_TICKET_B */
1328 return (dtls1_do_write(s
, SSL3_RT_HANDSHAKE
));