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
,
142 dtls1_get_server_method
)
144 int dtls1_accept(SSL
*s
)
147 unsigned long l
,Time
=(unsigned long)time(NULL
);
148 void (*cb
)(const SSL
*ssl
,int type
,int val
)=NULL
;
151 int new_state
,state
,skip
=0;
153 RAND_add(&Time
,sizeof(Time
),0);
157 if (s
->info_callback
!= NULL
)
159 else if (s
->ctx
->info_callback
!= NULL
)
160 cb
=s
->ctx
->info_callback
;
162 /* init things to blank */
164 if (!SSL_in_init(s
) || SSL_in_before(s
)) SSL_clear(s
);
168 SSLerr(SSL_F_DTLS1_ACCEPT
,SSL_R_NO_CERTIFICATE_SET
);
178 case SSL_ST_RENEGOTIATE
:
180 /* s->state=SSL_ST_ACCEPT; */
184 case SSL_ST_BEFORE
|SSL_ST_ACCEPT
:
185 case SSL_ST_OK
|SSL_ST_ACCEPT
:
188 if (cb
!= NULL
) cb(s
,SSL_CB_HANDSHAKE_START
,1);
190 if ((s
->version
& 0xff00) != (DTLS1_VERSION
& 0xff00))
192 SSLerr(SSL_F_DTLS1_ACCEPT
, ERR_R_INTERNAL_ERROR
);
195 s
->type
=SSL_ST_ACCEPT
;
197 if (s
->init_buf
== NULL
)
199 if ((buf
=BUF_MEM_new()) == NULL
)
204 if (!BUF_MEM_grow(buf
,SSL3_RT_MAX_PLAIN_LENGTH
))
212 if (!ssl3_setup_buffers(s
))
220 if (s
->state
!= SSL_ST_RENEGOTIATE
)
222 /* Ok, we now need to push on a buffering BIO so that
223 * the output is sent in a way that TCP likes :-)
225 if (!ssl_init_wbio_buffer(s
,1)) { ret
= -1; goto end
; }
227 ssl3_init_finished_mac(s
);
228 s
->state
=SSL3_ST_SR_CLNT_HELLO_A
;
229 s
->ctx
->stats
.sess_accept
++;
233 /* s->state == SSL_ST_RENEGOTIATE,
234 * we will just send a HelloRequest */
235 s
->ctx
->stats
.sess_accept_renegotiate
++;
236 s
->state
=SSL3_ST_SW_HELLO_REQ_A
;
239 if ( (SSL_get_options(s
) & SSL_OP_COOKIE_EXCHANGE
))
240 s
->d1
->send_cookie
= 1;
242 s
->d1
->send_cookie
= 0;
246 case SSL3_ST_SW_HELLO_REQ_A
:
247 case SSL3_ST_SW_HELLO_REQ_B
:
250 ret
=dtls1_send_hello_request(s
);
251 if (ret
<= 0) goto end
;
252 s
->s3
->tmp
.next_state
=SSL3_ST_SW_HELLO_REQ_C
;
253 s
->state
=SSL3_ST_SW_FLUSH
;
256 ssl3_init_finished_mac(s
);
259 case SSL3_ST_SW_HELLO_REQ_C
:
263 case SSL3_ST_SR_CLNT_HELLO_A
:
264 case SSL3_ST_SR_CLNT_HELLO_B
:
265 case SSL3_ST_SR_CLNT_HELLO_C
:
268 ret
=ssl3_get_client_hello(s
);
269 if (ret
<= 0) goto end
;
272 if ( s
->d1
->send_cookie
)
273 s
->state
= DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A
;
275 s
->state
= SSL3_ST_SW_SRVR_HELLO_A
;
280 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A
:
281 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B
:
283 ret
= dtls1_send_hello_verify_request(s
);
284 if ( ret
<= 0) goto end
;
285 s
->d1
->send_cookie
= 0;
286 s
->state
=SSL3_ST_SW_FLUSH
;
287 s
->s3
->tmp
.next_state
=SSL3_ST_SR_CLNT_HELLO_A
;
289 /* HelloVerifyRequests resets Finished MAC */
290 if (s
->client_version
!= DTLS1_BAD_VER
)
291 ssl3_init_finished_mac(s
);
294 case SSL3_ST_SW_SRVR_HELLO_A
:
295 case SSL3_ST_SW_SRVR_HELLO_B
:
296 ret
=dtls1_send_server_hello(s
);
297 if (ret
<= 0) goto end
;
300 s
->state
=SSL3_ST_SW_CHANGE_A
;
302 s
->state
=SSL3_ST_SW_CERT_A
;
306 case SSL3_ST_SW_CERT_A
:
307 case SSL3_ST_SW_CERT_B
:
308 /* Check if it is anon DH */
309 if (!(s
->s3
->tmp
.new_cipher
->algorithms
& SSL_aNULL
))
311 ret
=dtls1_send_server_certificate(s
);
312 if (ret
<= 0) goto end
;
316 s
->state
=SSL3_ST_SW_KEY_EXCH_A
;
320 case SSL3_ST_SW_KEY_EXCH_A
:
321 case SSL3_ST_SW_KEY_EXCH_B
:
322 l
=s
->s3
->tmp
.new_cipher
->algorithms
;
324 /* clear this, it may get reset by
325 * send_server_key_exchange */
326 if ((s
->options
& SSL_OP_EPHEMERAL_RSA
)
327 #ifndef OPENSSL_NO_KRB5
329 #endif /* OPENSSL_NO_KRB5 */
331 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
332 * even when forbidden by protocol specs
333 * (handshake may fail as clients are not required to
334 * be able to handle this) */
335 s
->s3
->tmp
.use_rsa_tmp
=1;
337 s
->s3
->tmp
.use_rsa_tmp
=0;
339 /* only send if a DH key exchange, fortezza or
340 * RSA but we have a sign only certificate */
341 if (s
->s3
->tmp
.use_rsa_tmp
342 || (l
& (SSL_DH
|SSL_kFZA
))
344 && (s
->cert
->pkeys
[SSL_PKEY_RSA_ENC
].privatekey
== NULL
345 || (SSL_C_IS_EXPORT(s
->s3
->tmp
.new_cipher
)
346 && EVP_PKEY_size(s
->cert
->pkeys
[SSL_PKEY_RSA_ENC
].privatekey
)*8 > SSL_C_EXPORT_PKEYLENGTH(s
->s3
->tmp
.new_cipher
)
352 ret
=dtls1_send_server_key_exchange(s
);
353 if (ret
<= 0) goto end
;
358 s
->state
=SSL3_ST_SW_CERT_REQ_A
;
362 case SSL3_ST_SW_CERT_REQ_A
:
363 case SSL3_ST_SW_CERT_REQ_B
:
364 if (/* don't request cert unless asked for it: */
365 !(s
->verify_mode
& SSL_VERIFY_PEER
) ||
366 /* if SSL_VERIFY_CLIENT_ONCE is set,
367 * don't request cert during re-negotiation: */
368 ((s
->session
->peer
!= NULL
) &&
369 (s
->verify_mode
& SSL_VERIFY_CLIENT_ONCE
)) ||
370 /* never request cert in anonymous ciphersuites
371 * (see section "Certificate request" in SSL 3 drafts
372 * and in RFC 2246): */
373 ((s
->s3
->tmp
.new_cipher
->algorithms
& SSL_aNULL
) &&
374 /* ... except when the application insists on verification
375 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
376 !(s
->verify_mode
& SSL_VERIFY_FAIL_IF_NO_PEER_CERT
)) ||
377 /* never request cert in Kerberos ciphersuites */
378 (s
->s3
->tmp
.new_cipher
->algorithms
& SSL_aKRB5
))
380 /* no cert request */
382 s
->s3
->tmp
.cert_request
=0;
383 s
->state
=SSL3_ST_SW_SRVR_DONE_A
;
387 s
->s3
->tmp
.cert_request
=1;
388 ret
=dtls1_send_certificate_request(s
);
389 if (ret
<= 0) goto end
;
390 #ifndef NETSCAPE_HANG_BUG
391 s
->state
=SSL3_ST_SW_SRVR_DONE_A
;
393 s
->state
=SSL3_ST_SW_FLUSH
;
394 s
->s3
->tmp
.next_state
=SSL3_ST_SR_CERT_A
;
400 case SSL3_ST_SW_SRVR_DONE_A
:
401 case SSL3_ST_SW_SRVR_DONE_B
:
402 ret
=dtls1_send_server_done(s
);
403 if (ret
<= 0) goto end
;
404 s
->s3
->tmp
.next_state
=SSL3_ST_SR_CERT_A
;
405 s
->state
=SSL3_ST_SW_FLUSH
;
409 case SSL3_ST_SW_FLUSH
:
410 /* number of bytes to be flushed */
411 num1
=BIO_ctrl(s
->wbio
,BIO_CTRL_INFO
,0,NULL
);
414 s
->rwstate
=SSL_WRITING
;
415 num1
=BIO_flush(s
->wbio
);
416 if (num1
<= 0) { ret
= -1; goto end
; }
417 s
->rwstate
=SSL_NOTHING
;
420 s
->state
=s
->s3
->tmp
.next_state
;
423 case SSL3_ST_SR_CERT_A
:
424 case SSL3_ST_SR_CERT_B
:
425 /* Check for second client hello (MS SGC) */
426 ret
= ssl3_check_client_hello(s
);
430 s
->state
= SSL3_ST_SR_CLNT_HELLO_C
;
432 /* could be sent for a DH cert, even if we
433 * have not asked for it :-) */
434 ret
=ssl3_get_client_certificate(s
);
435 if (ret
<= 0) goto end
;
437 s
->state
=SSL3_ST_SR_KEY_EXCH_A
;
441 case SSL3_ST_SR_KEY_EXCH_A
:
442 case SSL3_ST_SR_KEY_EXCH_B
:
443 ret
=ssl3_get_client_key_exchange(s
);
444 if (ret
<= 0) goto end
;
445 s
->state
=SSL3_ST_SR_CERT_VRFY_A
;
448 /* We need to get hashes here so if there is
449 * a client cert, it can be verified */
450 s
->method
->ssl3_enc
->cert_verify_mac(s
,
451 &(s
->s3
->finish_dgst1
),
452 &(s
->s3
->tmp
.cert_verify_md
[0]));
453 s
->method
->ssl3_enc
->cert_verify_mac(s
,
454 &(s
->s3
->finish_dgst2
),
455 &(s
->s3
->tmp
.cert_verify_md
[MD5_DIGEST_LENGTH
]));
459 case SSL3_ST_SR_CERT_VRFY_A
:
460 case SSL3_ST_SR_CERT_VRFY_B
:
462 /* we should decide if we expected this one */
463 ret
=ssl3_get_cert_verify(s
);
464 if (ret
<= 0) goto end
;
466 s
->state
=SSL3_ST_SR_FINISHED_A
;
470 case SSL3_ST_SR_FINISHED_A
:
471 case SSL3_ST_SR_FINISHED_B
:
472 ret
=ssl3_get_finished(s
,SSL3_ST_SR_FINISHED_A
,
473 SSL3_ST_SR_FINISHED_B
);
474 if (ret
<= 0) goto end
;
478 s
->state
=SSL3_ST_SW_CHANGE_A
;
482 case SSL3_ST_SW_CHANGE_A
:
483 case SSL3_ST_SW_CHANGE_B
:
485 s
->session
->cipher
=s
->s3
->tmp
.new_cipher
;
486 if (!s
->method
->ssl3_enc
->setup_key_block(s
))
487 { ret
= -1; goto end
; }
489 ret
=dtls1_send_change_cipher_spec(s
,
490 SSL3_ST_SW_CHANGE_A
,SSL3_ST_SW_CHANGE_B
);
492 if (ret
<= 0) goto end
;
493 s
->state
=SSL3_ST_SW_FINISHED_A
;
496 if (!s
->method
->ssl3_enc
->change_cipher_state(s
,
497 SSL3_CHANGE_CIPHER_SERVER_WRITE
))
503 dtls1_reset_seq_numbers(s
, SSL3_CC_WRITE
);
506 case SSL3_ST_SW_FINISHED_A
:
507 case SSL3_ST_SW_FINISHED_B
:
508 ret
=dtls1_send_finished(s
,
509 SSL3_ST_SW_FINISHED_A
,SSL3_ST_SW_FINISHED_B
,
510 s
->method
->ssl3_enc
->server_finished_label
,
511 s
->method
->ssl3_enc
->server_finished_label_len
);
512 if (ret
<= 0) goto end
;
513 s
->state
=SSL3_ST_SW_FLUSH
;
515 s
->s3
->tmp
.next_state
=SSL3_ST_SR_FINISHED_A
;
517 s
->s3
->tmp
.next_state
=SSL_ST_OK
;
522 /* clean a few things up */
523 ssl3_cleanup_key_block(s
);
526 BUF_MEM_free(s
->init_buf
);
530 /* remove buffering on output */
531 ssl_free_wbio_buffer(s
);
535 if (s
->new_session
== 2) /* skipped if we just sent a HelloRequest */
537 /* actually not necessarily a 'new' session unless
538 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
542 ssl_update_cache(s
,SSL_SESS_CACHE_SERVER
);
544 s
->ctx
->stats
.sess_accept_good
++;
546 s
->handshake_func
=dtls1_accept
;
548 if (cb
!= NULL
) cb(s
,SSL_CB_HANDSHAKE_DONE
,1);
553 /* done handshaking, next message is client hello */
554 s
->d1
->handshake_read_seq
= 0;
555 /* next message is server hello */
556 s
->d1
->handshake_write_seq
= 0;
561 SSLerr(SSL_F_DTLS1_ACCEPT
,SSL_R_UNKNOWN_STATE
);
567 if (!s
->s3
->tmp
.reuse_message
&& !skip
)
571 if ((ret
=BIO_flush(s
->wbio
)) <= 0)
576 if ((cb
!= NULL
) && (s
->state
!= state
))
580 cb(s
,SSL_CB_ACCEPT_LOOP
,1);
587 /* BIO_flush(s->wbio); */
591 cb(s
,SSL_CB_ACCEPT_EXIT
,ret
);
595 int dtls1_send_hello_request(SSL
*s
)
599 if (s
->state
== SSL3_ST_SW_HELLO_REQ_A
)
601 p
=(unsigned char *)s
->init_buf
->data
;
602 p
= dtls1_set_message_header(s
, p
, SSL3_MT_HELLO_REQUEST
, 0, 0, 0);
604 s
->state
=SSL3_ST_SW_HELLO_REQ_B
;
605 /* number of bytes to write */
606 s
->init_num
=DTLS1_HM_HEADER_LENGTH
;
609 /* no need to buffer this message, since there are no retransmit
613 /* SSL3_ST_SW_HELLO_REQ_B */
614 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
617 int dtls1_send_hello_verify_request(SSL
*s
)
619 unsigned int msg_len
;
620 unsigned char *msg
, *buf
, *p
;
622 if (s
->state
== DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A
)
624 buf
= (unsigned char *)s
->init_buf
->data
;
626 msg
= p
= &(buf
[DTLS1_HM_HEADER_LENGTH
]);
627 if (s
->client_version
== DTLS1_BAD_VER
)
628 *(p
++) = DTLS1_BAD_VER
>>8,
629 *(p
++) = DTLS1_BAD_VER
&0xff;
631 *(p
++) = s
->version
>> 8,
632 *(p
++) = s
->version
& 0xFF;
634 if (s
->ctx
->app_gen_cookie_cb
!= NULL
&&
635 s
->ctx
->app_gen_cookie_cb(s
, s
->d1
->cookie
,
636 &(s
->d1
->cookie_len
)) == 0)
638 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST
,ERR_R_INTERNAL_ERROR
);
641 /* else the cookie is assumed to have
642 * been initialized by the application */
644 *(p
++) = (unsigned char) s
->d1
->cookie_len
;
645 memcpy(p
, s
->d1
->cookie
, s
->d1
->cookie_len
);
646 p
+= s
->d1
->cookie_len
;
649 dtls1_set_message_header(s
, buf
,
650 DTLS1_MT_HELLO_VERIFY_REQUEST
, msg_len
, 0, msg_len
);
652 s
->state
=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B
;
653 /* number of bytes to write */
657 /* buffer the message to handle re-xmits */
658 dtls1_buffer_message(s
, 0);
661 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
662 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
665 int dtls1_send_server_hello(SSL
*s
)
671 unsigned long l
,Time
;
673 if (s
->state
== SSL3_ST_SW_SRVR_HELLO_A
)
675 buf
=(unsigned char *)s
->init_buf
->data
;
676 p
=s
->s3
->server_random
;
677 Time
=(unsigned long)time(NULL
); /* Time */
679 RAND_pseudo_bytes(p
,SSL3_RANDOM_SIZE
-sizeof(Time
));
680 /* Do the message type and length last */
681 d
=p
= &(buf
[DTLS1_HM_HEADER_LENGTH
]);
683 if (s
->client_version
== DTLS1_BAD_VER
)
684 *(p
++)=DTLS1_BAD_VER
>>8,
685 *(p
++)=DTLS1_BAD_VER
&0xff;
687 *(p
++)=s
->version
>>8,
688 *(p
++)=s
->version
&0xff;
691 memcpy(p
,s
->s3
->server_random
,SSL3_RANDOM_SIZE
);
694 /* now in theory we have 3 options to sending back the
695 * session id. If it is a re-use, we send back the
696 * old session-id, if it is a new session, we send
697 * back the new session-id or we send back a 0 length
698 * session-id if we want it to be single use.
699 * Currently I will not implement the '0' length session-id
700 * 12-Jan-98 - I'll now support the '0' length stuff.
702 if (!(s
->ctx
->session_cache_mode
& SSL_SESS_CACHE_SERVER
))
703 s
->session
->session_id_length
=0;
705 sl
=s
->session
->session_id_length
;
706 if (sl
> sizeof s
->session
->session_id
)
708 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO
, ERR_R_INTERNAL_ERROR
);
712 memcpy(p
,s
->session
->session_id
,sl
);
716 i
=ssl3_put_cipher_by_char(s
->s3
->tmp
.new_cipher
,p
);
719 /* put the compression method */
720 #ifdef OPENSSL_NO_COMP
723 if (s
->s3
->tmp
.new_compression
== NULL
)
726 *(p
++)=s
->s3
->tmp
.new_compression
->id
;
733 d
= dtls1_set_message_header(s
, d
, SSL3_MT_SERVER_HELLO
, l
, 0, l
);
735 s
->state
=SSL3_ST_CW_CLNT_HELLO_B
;
736 /* number of bytes to write */
740 /* buffer the message to handle re-xmits */
741 dtls1_buffer_message(s
, 0);
744 /* SSL3_ST_CW_CLNT_HELLO_B */
745 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
748 int dtls1_send_server_done(SSL
*s
)
752 if (s
->state
== SSL3_ST_SW_SRVR_DONE_A
)
754 p
=(unsigned char *)s
->init_buf
->data
;
757 p
= dtls1_set_message_header(s
, p
, SSL3_MT_SERVER_DONE
, 0, 0, 0);
759 s
->state
=SSL3_ST_SW_SRVR_DONE_B
;
760 /* number of bytes to write */
761 s
->init_num
=DTLS1_HM_HEADER_LENGTH
;
764 /* buffer the message to handle re-xmits */
765 dtls1_buffer_message(s
, 0);
768 /* SSL3_ST_CW_CLNT_HELLO_B */
769 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
772 int dtls1_send_server_key_exchange(SSL
*s
)
774 #ifndef OPENSSL_NO_RSA
778 unsigned char md_buf
[MD5_DIGEST_LENGTH
+SHA_DIGEST_LENGTH
];
781 #ifndef OPENSSL_NO_DH
795 EVP_MD_CTX_init(&md_ctx
);
796 if (s
->state
== SSL3_ST_SW_KEY_EXCH_A
)
798 type
=s
->s3
->tmp
.new_cipher
->algorithms
& SSL_MKEY_MASK
;
803 r
[0]=r
[1]=r
[2]=r
[3]=NULL
;
805 #ifndef OPENSSL_NO_RSA
809 if ((rsa
== NULL
) && (s
->cert
->rsa_tmp_cb
!= NULL
))
811 rsa
=s
->cert
->rsa_tmp_cb(s
,
812 SSL_C_IS_EXPORT(s
->s3
->tmp
.new_cipher
),
813 SSL_C_EXPORT_PKEYLENGTH(s
->s3
->tmp
.new_cipher
));
816 al
=SSL_AD_HANDSHAKE_FAILURE
;
817 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_ERROR_GENERATING_TMP_RSA_KEY
);
825 al
=SSL_AD_HANDSHAKE_FAILURE
;
826 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_MISSING_TMP_RSA_KEY
);
831 s
->s3
->tmp
.use_rsa_tmp
=1;
835 #ifndef OPENSSL_NO_DH
839 if ((dhp
== NULL
) && (s
->cert
->dh_tmp_cb
!= NULL
))
840 dhp
=s
->cert
->dh_tmp_cb(s
,
841 SSL_C_IS_EXPORT(s
->s3
->tmp
.new_cipher
),
842 SSL_C_EXPORT_PKEYLENGTH(s
->s3
->tmp
.new_cipher
));
845 al
=SSL_AD_HANDSHAKE_FAILURE
;
846 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_MISSING_TMP_DH_KEY
);
850 if (s
->s3
->tmp
.dh
!= NULL
)
853 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
, ERR_R_INTERNAL_ERROR
);
857 if ((dh
=DHparams_dup(dhp
)) == NULL
)
859 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_R_DH_LIB
);
864 if ((dhp
->pub_key
== NULL
||
865 dhp
->priv_key
== NULL
||
866 (s
->options
& SSL_OP_SINGLE_DH_USE
)))
868 if(!DH_generate_key(dh
))
870 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,
877 dh
->pub_key
=BN_dup(dhp
->pub_key
);
878 dh
->priv_key
=BN_dup(dhp
->priv_key
);
879 if ((dh
->pub_key
== NULL
) ||
880 (dh
->priv_key
== NULL
))
882 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_R_DH_LIB
);
893 al
=SSL_AD_HANDSHAKE_FAILURE
;
894 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE
);
897 for (i
=0; r
[i
] != NULL
; i
++)
899 nr
[i
]=BN_num_bytes(r
[i
]);
903 if (!(s
->s3
->tmp
.new_cipher
->algorithms
& SSL_aNULL
))
905 if ((pkey
=ssl_get_sign_pkey(s
,s
->s3
->tmp
.new_cipher
))
908 al
=SSL_AD_DECODE_ERROR
;
911 kn
=EVP_PKEY_size(pkey
);
919 if (!BUF_MEM_grow_clean(buf
,n
+DTLS1_HM_HEADER_LENGTH
+kn
))
921 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_LIB_BUF
);
924 d
=(unsigned char *)s
->init_buf
->data
;
925 p
= &(d
[DTLS1_HM_HEADER_LENGTH
]);
927 for (i
=0; r
[i
] != NULL
; i
++)
937 /* n is the length of the params, they start at
938 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
940 #ifndef OPENSSL_NO_RSA
941 if (pkey
->type
== EVP_PKEY_RSA
)
945 for (num
=2; num
> 0; num
--)
947 EVP_DigestInit_ex(&md_ctx
,(num
== 2)
948 ?s
->ctx
->md5
:s
->ctx
->sha1
, NULL
);
949 EVP_DigestUpdate(&md_ctx
,&(s
->s3
->client_random
[0]),SSL3_RANDOM_SIZE
);
950 EVP_DigestUpdate(&md_ctx
,&(s
->s3
->server_random
[0]),SSL3_RANDOM_SIZE
);
951 EVP_DigestUpdate(&md_ctx
,&(d
[DTLS1_HM_HEADER_LENGTH
]),n
);
952 EVP_DigestFinal_ex(&md_ctx
,q
,
957 if (RSA_sign(NID_md5_sha1
, md_buf
, j
,
958 &(p
[2]), &u
, pkey
->pkey
.rsa
) <= 0)
960 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_LIB_RSA
);
968 #if !defined(OPENSSL_NO_DSA)
969 if (pkey
->type
== EVP_PKEY_DSA
)
972 EVP_SignInit_ex(&md_ctx
,EVP_dss1(), NULL
);
973 EVP_SignUpdate(&md_ctx
,&(s
->s3
->client_random
[0]),SSL3_RANDOM_SIZE
);
974 EVP_SignUpdate(&md_ctx
,&(s
->s3
->server_random
[0]),SSL3_RANDOM_SIZE
);
975 EVP_SignUpdate(&md_ctx
,&(d
[DTLS1_HM_HEADER_LENGTH
]),n
);
976 if (!EVP_SignFinal(&md_ctx
,&(p
[2]),
977 (unsigned int *)&i
,pkey
))
979 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,ERR_LIB_DSA
);
988 /* Is this error check actually needed? */
989 al
=SSL_AD_HANDSHAKE_FAILURE
;
990 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE
,SSL_R_UNKNOWN_PKEY_TYPE
);
995 d
= dtls1_set_message_header(s
, d
,
996 SSL3_MT_SERVER_KEY_EXCHANGE
, n
, 0, n
);
998 /* we should now have things packed up, so lets send
1000 s
->init_num
=n
+DTLS1_HM_HEADER_LENGTH
;
1003 /* buffer the message to handle re-xmits */
1004 dtls1_buffer_message(s
, 0);
1007 s
->state
= SSL3_ST_SW_KEY_EXCH_B
;
1008 EVP_MD_CTX_cleanup(&md_ctx
);
1009 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
1011 ssl3_send_alert(s
,SSL3_AL_FATAL
,al
);
1013 EVP_MD_CTX_cleanup(&md_ctx
);
1017 int dtls1_send_certificate_request(SSL
*s
)
1019 unsigned char *p
,*d
;
1021 STACK_OF(X509_NAME
) *sk
=NULL
;
1024 unsigned int msg_len
;
1026 if (s
->state
== SSL3_ST_SW_CERT_REQ_A
)
1030 d
=p
=(unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
]);
1032 /* get the list of acceptable cert types */
1034 n
=ssl3_get_req_cert_type(s
,p
);
1043 sk
=SSL_get_client_CA_list(s
);
1047 for (i
=0; i
<sk_X509_NAME_num(sk
); i
++)
1049 name
=sk_X509_NAME_value(sk
,i
);
1050 j
=i2d_X509_NAME(name
,NULL
);
1051 if (!BUF_MEM_grow_clean(buf
,DTLS1_HM_HEADER_LENGTH
+n
+j
+2))
1053 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST
,ERR_R_BUF_LIB
);
1056 p
=(unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
+n
]);
1057 if (!(s
->options
& SSL_OP_NETSCAPE_CA_DN_BUG
))
1060 i2d_X509_NAME(name
,&p
);
1067 i2d_X509_NAME(name
,&p
);
1068 j
-=2; s2n(j
,d
); j
+=2;
1074 /* else no CA names */
1075 p
=(unsigned char *)&(buf
->data
[DTLS1_HM_HEADER_LENGTH
+off
]);
1078 d
=(unsigned char *)buf
->data
;
1079 *(d
++)=SSL3_MT_CERTIFICATE_REQUEST
;
1081 s2n(s
->d1
->handshake_write_seq
,d
);
1082 s
->d1
->handshake_write_seq
++;
1084 /* we should now have things packed up, so lets send
1087 s
->init_num
=n
+DTLS1_HM_HEADER_LENGTH
;
1089 #ifdef NETSCAPE_HANG_BUG
1090 /* XXX: what to do about this? */
1091 p
=(unsigned char *)s
->init_buf
->data
+ s
->init_num
;
1094 *(p
++)=SSL3_MT_SERVER_DONE
;
1101 /* XDTLS: set message header ? */
1102 msg_len
= s
->init_num
- DTLS1_HM_HEADER_LENGTH
;
1103 dtls1_set_message_header(s
, (void *)s
->init_buf
->data
,
1104 SSL3_MT_CERTIFICATE_REQUEST
, msg_len
, 0, msg_len
);
1106 /* buffer the message to handle re-xmits */
1107 dtls1_buffer_message(s
, 0);
1109 s
->state
= SSL3_ST_SW_CERT_REQ_B
;
1112 /* SSL3_ST_SW_CERT_REQ_B */
1113 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));
1118 int dtls1_send_server_certificate(SSL
*s
)
1123 if (s
->state
== SSL3_ST_SW_CERT_A
)
1125 x
=ssl_get_server_send_cert(s
);
1127 /* VRS: allow null cert if auth == KRB5 */
1128 (s
->s3
->tmp
.new_cipher
->algorithms
1129 & (SSL_MKEY_MASK
|SSL_AUTH_MASK
))
1130 != (SSL_aKRB5
|SSL_kKRB5
))
1132 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE
,ERR_R_INTERNAL_ERROR
);
1136 l
=dtls1_output_cert_chain(s
,x
);
1137 s
->state
=SSL3_ST_SW_CERT_B
;
1141 /* buffer the message to handle re-xmits */
1142 dtls1_buffer_message(s
, 0);
1145 /* SSL3_ST_SW_CERT_B */
1146 return(dtls1_do_write(s
,SSL3_RT_HANDSHAKE
));