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;
153 int new_state,state,skip=0;
155 RAND_add(&Time,sizeof(Time),0);
159 if (s->info_callback != NULL)
161 else if (s->ctx->info_callback != NULL)
162 cb=s->ctx->info_callback;
164 /* init things to blank */
166 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
170 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
180 case SSL_ST_RENEGOTIATE:
182 /* s->state=SSL_ST_ACCEPT; */
186 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
187 case SSL_ST_OK|SSL_ST_ACCEPT:
190 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
192 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
194 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
197 s->type=SSL_ST_ACCEPT;
199 if (s->init_buf == NULL)
201 if ((buf=BUF_MEM_new()) == NULL)
206 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
214 if (!ssl3_setup_buffers(s))
222 if (s->state != SSL_ST_RENEGOTIATE)
224 /* Ok, we now need to push on a buffering BIO so that
225 * the output is sent in a way that TCP likes :-)
227 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
229 ssl3_init_finished_mac(s);
230 s->state=SSL3_ST_SR_CLNT_HELLO_A;
231 s->ctx->stats.sess_accept++;
235 /* s->state == SSL_ST_RENEGOTIATE,
236 * we will just send a HelloRequest */
237 s->ctx->stats.sess_accept_renegotiate++;
238 s->state=SSL3_ST_SW_HELLO_REQ_A;
241 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
242 s->d1->send_cookie = 1;
244 s->d1->send_cookie = 0;
248 case SSL3_ST_SW_HELLO_REQ_A:
249 case SSL3_ST_SW_HELLO_REQ_B:
252 ret=dtls1_send_hello_request(s);
253 if (ret <= 0) goto end;
254 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
255 s->state=SSL3_ST_SW_FLUSH;
258 ssl3_init_finished_mac(s);
261 case SSL3_ST_SW_HELLO_REQ_C:
265 case SSL3_ST_SR_CLNT_HELLO_A:
266 case SSL3_ST_SR_CLNT_HELLO_B:
267 case SSL3_ST_SR_CLNT_HELLO_C:
270 ret=ssl3_get_client_hello(s);
271 if (ret <= 0) goto end;
274 if (s->d1->send_cookie)
275 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
277 s->state = SSL3_ST_SW_SRVR_HELLO_A;
282 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
283 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
285 ret = dtls1_send_hello_verify_request(s);
286 if ( ret <= 0) goto end;
287 s->d1->send_cookie = 0;
288 s->state=SSL3_ST_SW_FLUSH;
289 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
291 /* HelloVerifyRequest resets Finished MAC */
292 ssl3_init_finished_mac(s);
295 case SSL3_ST_SW_SRVR_HELLO_A:
296 case SSL3_ST_SW_SRVR_HELLO_B:
297 ret=dtls1_send_server_hello(s);
298 if (ret <= 0) goto end;
301 s->state=SSL3_ST_SW_CHANGE_A;
303 s->state=SSL3_ST_SW_CERT_A;
307 case SSL3_ST_SW_CERT_A:
308 case SSL3_ST_SW_CERT_B:
309 /* Check if it is anon DH */
310 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
312 ret=dtls1_send_server_certificate(s);
313 if (ret <= 0) goto end;
317 s->state=SSL3_ST_SW_KEY_EXCH_A;
321 case SSL3_ST_SW_KEY_EXCH_A:
322 case SSL3_ST_SW_KEY_EXCH_B:
323 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
325 /* clear this, it may get reset by
326 * send_server_key_exchange */
327 if ((s->options & SSL_OP_EPHEMERAL_RSA)
328 #ifndef OPENSSL_NO_KRB5
329 && !(alg_k & SSL_kKRB5)
330 #endif /* OPENSSL_NO_KRB5 */
332 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
333 * even when forbidden by protocol specs
334 * (handshake may fail as clients are not required to
335 * be able to handle this) */
336 s->s3->tmp.use_rsa_tmp=1;
338 s->s3->tmp.use_rsa_tmp=0;
340 /* only send if a DH key exchange or
341 * RSA but we have a sign only certificate */
342 if (s->s3->tmp.use_rsa_tmp
343 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
344 || ((alg_k & SSL_kRSA)
345 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
346 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
347 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
353 ret=dtls1_send_server_key_exchange(s);
354 if (ret <= 0) goto end;
359 s->state=SSL3_ST_SW_CERT_REQ_A;
363 case SSL3_ST_SW_CERT_REQ_A:
364 case SSL3_ST_SW_CERT_REQ_B:
365 if (/* don't request cert unless asked for it: */
366 !(s->verify_mode & SSL_VERIFY_PEER) ||
367 /* if SSL_VERIFY_CLIENT_ONCE is set,
368 * don't request cert during re-negotiation: */
369 ((s->session->peer != NULL) &&
370 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
371 /* never request cert in anonymous ciphersuites
372 * (see section "Certificate request" in SSL 3 drafts
373 * and in RFC 2246): */
374 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
375 /* ... except when the application insists on verification
376 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
377 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
378 /* never request cert in Kerberos ciphersuites */
379 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
381 /* no cert request */
383 s->s3->tmp.cert_request=0;
384 s->state=SSL3_ST_SW_SRVR_DONE_A;
388 s->s3->tmp.cert_request=1;
389 ret=dtls1_send_certificate_request(s);
390 if (ret <= 0) goto end;
391 #ifndef NETSCAPE_HANG_BUG
392 s->state=SSL3_ST_SW_SRVR_DONE_A;
394 s->state=SSL3_ST_SW_FLUSH;
395 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
401 case SSL3_ST_SW_SRVR_DONE_A:
402 case SSL3_ST_SW_SRVR_DONE_B:
403 ret=dtls1_send_server_done(s);
404 if (ret <= 0) goto end;
405 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
406 s->state=SSL3_ST_SW_FLUSH;
410 case SSL3_ST_SW_FLUSH:
411 /* number of bytes to be flushed */
412 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
415 s->rwstate=SSL_WRITING;
416 num1=BIO_flush(s->wbio);
417 if (num1 <= 0) { ret= -1; goto end; }
418 s->rwstate=SSL_NOTHING;
421 s->state=s->s3->tmp.next_state;
424 case SSL3_ST_SR_CERT_A:
425 case SSL3_ST_SR_CERT_B:
426 /* Check for second client hello (MS SGC) */
427 ret = ssl3_check_client_hello(s);
431 s->state = SSL3_ST_SR_CLNT_HELLO_C;
433 /* could be sent for a DH cert, even if we
434 * have not asked for it :-) */
435 ret=ssl3_get_client_certificate(s);
436 if (ret <= 0) goto end;
438 s->state=SSL3_ST_SR_KEY_EXCH_A;
442 case SSL3_ST_SR_KEY_EXCH_A:
443 case SSL3_ST_SR_KEY_EXCH_B:
444 ret=ssl3_get_client_key_exchange(s);
445 if (ret <= 0) goto end;
446 s->state=SSL3_ST_SR_CERT_VRFY_A;
449 /* We need to get hashes here so if there is
450 * a client cert, it can be verified */
451 s->method->ssl3_enc->cert_verify_mac(s,
453 &(s->s3->tmp.cert_verify_md[0]));
454 s->method->ssl3_enc->cert_verify_mac(s,
456 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
460 case SSL3_ST_SR_CERT_VRFY_A:
461 case SSL3_ST_SR_CERT_VRFY_B:
463 /* we should decide if we expected this one */
464 ret=ssl3_get_cert_verify(s);
465 if (ret <= 0) goto end;
467 s->state=SSL3_ST_SR_FINISHED_A;
471 case SSL3_ST_SR_FINISHED_A:
472 case SSL3_ST_SR_FINISHED_B:
473 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
474 SSL3_ST_SR_FINISHED_B);
475 if (ret <= 0) goto end;
479 s->state=SSL3_ST_SW_CHANGE_A;
483 case SSL3_ST_SW_CHANGE_A:
484 case SSL3_ST_SW_CHANGE_B:
486 s->session->cipher=s->s3->tmp.new_cipher;
487 if (!s->method->ssl3_enc->setup_key_block(s))
488 { ret= -1; goto end; }
490 ret=dtls1_send_change_cipher_spec(s,
491 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
493 if (ret <= 0) goto end;
494 s->state=SSL3_ST_SW_FINISHED_A;
497 if (!s->method->ssl3_enc->change_cipher_state(s,
498 SSL3_CHANGE_CIPHER_SERVER_WRITE))
504 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
507 case SSL3_ST_SW_FINISHED_A:
508 case SSL3_ST_SW_FINISHED_B:
509 ret=dtls1_send_finished(s,
510 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
511 s->method->ssl3_enc->server_finished_label,
512 s->method->ssl3_enc->server_finished_label_len);
513 if (ret <= 0) goto end;
514 s->state=SSL3_ST_SW_FLUSH;
516 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
518 s->s3->tmp.next_state=SSL_ST_OK;
523 /* clean a few things up */
524 ssl3_cleanup_key_block(s);
527 BUF_MEM_free(s->init_buf);
531 /* remove buffering on output */
532 ssl_free_wbio_buffer(s);
536 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
538 /* actually not necessarily a 'new' session unless
539 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
543 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
545 s->ctx->stats.sess_accept_good++;
547 s->handshake_func=dtls1_accept;
549 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
554 /* done handshaking, next message is client hello */
555 s->d1->handshake_read_seq = 0;
556 /* next message is server hello */
557 s->d1->handshake_write_seq = 0;
558 s->d1->next_handshake_write_seq = 0;
563 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
569 if (!s->s3->tmp.reuse_message && !skip)
573 if ((ret=BIO_flush(s->wbio)) <= 0)
578 if ((cb != NULL) && (s->state != state))
582 cb(s,SSL_CB_ACCEPT_LOOP,1);
589 /* BIO_flush(s->wbio); */
593 cb(s,SSL_CB_ACCEPT_EXIT,ret);
597 int dtls1_send_hello_request(SSL *s)
601 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
603 p=(unsigned char *)s->init_buf->data;
604 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
606 s->state=SSL3_ST_SW_HELLO_REQ_B;
607 /* number of bytes to write */
608 s->init_num=DTLS1_HM_HEADER_LENGTH;
611 /* no need to buffer this message, since there are no retransmit
615 /* SSL3_ST_SW_HELLO_REQ_B */
616 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
619 int dtls1_send_hello_verify_request(SSL *s)
621 unsigned int msg_len;
622 unsigned char *msg, *buf, *p;
624 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
626 buf = (unsigned char *)s->init_buf->data;
628 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
629 *(p++) = s->version >> 8;
630 *(p++) = s->version & 0xFF;
632 if (s->ctx->app_gen_cookie_cb != NULL &&
633 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
634 &(s->d1->cookie_len)) == 0)
636 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
639 /* else the cookie is assumed to have
640 * been initialized by the application */
642 *(p++) = (unsigned char) s->d1->cookie_len;
643 memcpy(p, s->d1->cookie, s->d1->cookie_len);
644 p += s->d1->cookie_len;
647 dtls1_set_message_header(s, buf,
648 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
650 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
651 /* number of bytes to write */
655 /* buffer the message to handle re-xmits */
656 dtls1_buffer_message(s, 0);
659 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
660 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
663 int dtls1_send_server_hello(SSL *s)
669 unsigned long l,Time;
671 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
673 buf=(unsigned char *)s->init_buf->data;
674 p=s->s3->server_random;
675 Time=(unsigned long)time(NULL); /* Time */
677 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
678 /* Do the message type and length last */
679 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
681 *(p++)=s->version>>8;
682 *(p++)=s->version&0xff;
685 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
688 /* now in theory we have 3 options to sending back the
689 * session id. If it is a re-use, we send back the
690 * old session-id, if it is a new session, we send
691 * back the new session-id or we send back a 0 length
692 * session-id if we want it to be single use.
693 * Currently I will not implement the '0' length session-id
694 * 12-Jan-98 - I'll now support the '0' length stuff.
696 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
697 s->session->session_id_length=0;
699 sl=s->session->session_id_length;
700 if (sl > sizeof s->session->session_id)
702 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
706 memcpy(p,s->session->session_id,sl);
710 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
713 /* put the compression method */
714 #ifdef OPENSSL_NO_COMP
717 if (s->s3->tmp.new_compression == NULL)
720 *(p++)=s->s3->tmp.new_compression->id;
727 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
729 s->state=SSL3_ST_SW_SRVR_HELLO_B;
730 /* number of bytes to write */
734 /* buffer the message to handle re-xmits */
735 dtls1_buffer_message(s, 0);
738 /* SSL3_ST_SW_SRVR_HELLO_B */
739 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
742 int dtls1_send_server_done(SSL *s)
746 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
748 p=(unsigned char *)s->init_buf->data;
751 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
753 s->state=SSL3_ST_SW_SRVR_DONE_B;
754 /* number of bytes to write */
755 s->init_num=DTLS1_HM_HEADER_LENGTH;
758 /* buffer the message to handle re-xmits */
759 dtls1_buffer_message(s, 0);
762 /* SSL3_ST_SW_SRVR_DONE_B */
763 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
766 int dtls1_send_server_key_exchange(SSL *s)
768 #ifndef OPENSSL_NO_RSA
772 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
775 #ifndef OPENSSL_NO_DH
789 EVP_MD_CTX_init(&md_ctx);
790 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
792 type=s->s3->tmp.new_cipher->algorithm_mkey;
797 r[0]=r[1]=r[2]=r[3]=NULL;
799 #ifndef OPENSSL_NO_RSA
803 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
805 rsa=s->cert->rsa_tmp_cb(s,
806 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
807 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
810 al=SSL_AD_HANDSHAKE_FAILURE;
811 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
819 al=SSL_AD_HANDSHAKE_FAILURE;
820 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
825 s->s3->tmp.use_rsa_tmp=1;
829 #ifndef OPENSSL_NO_DH
833 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
834 dhp=s->cert->dh_tmp_cb(s,
835 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
836 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
839 al=SSL_AD_HANDSHAKE_FAILURE;
840 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
844 if (s->s3->tmp.dh != NULL)
847 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
851 if ((dh=DHparams_dup(dhp)) == NULL)
853 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
858 if ((dhp->pub_key == NULL ||
859 dhp->priv_key == NULL ||
860 (s->options & SSL_OP_SINGLE_DH_USE)))
862 if(!DH_generate_key(dh))
864 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
871 dh->pub_key=BN_dup(dhp->pub_key);
872 dh->priv_key=BN_dup(dhp->priv_key);
873 if ((dh->pub_key == NULL) ||
874 (dh->priv_key == NULL))
876 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
887 al=SSL_AD_HANDSHAKE_FAILURE;
888 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
891 for (i=0; r[i] != NULL; i++)
893 nr[i]=BN_num_bytes(r[i]);
897 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
899 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
902 al=SSL_AD_DECODE_ERROR;
905 kn=EVP_PKEY_size(pkey);
913 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
915 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
918 d=(unsigned char *)s->init_buf->data;
919 p= &(d[DTLS1_HM_HEADER_LENGTH]);
921 for (i=0; r[i] != NULL; i++)
931 /* n is the length of the params, they start at
932 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
934 #ifndef OPENSSL_NO_RSA
935 if (pkey->type == EVP_PKEY_RSA)
939 for (num=2; num > 0; num--)
941 EVP_DigestInit_ex(&md_ctx,(num == 2)
942 ?s->ctx->md5:s->ctx->sha1, NULL);
943 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
944 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
945 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
946 EVP_DigestFinal_ex(&md_ctx,q,
951 if (RSA_sign(NID_md5_sha1, md_buf, j,
952 &(p[2]), &u, pkey->pkey.rsa) <= 0)
954 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
962 #if !defined(OPENSSL_NO_DSA)
963 if (pkey->type == EVP_PKEY_DSA)
966 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
967 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
968 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
969 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
970 if (!EVP_SignFinal(&md_ctx,&(p[2]),
971 (unsigned int *)&i,pkey))
973 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
982 /* Is this error check actually needed? */
983 al=SSL_AD_HANDSHAKE_FAILURE;
984 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
989 d = dtls1_set_message_header(s, d,
990 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
992 /* we should now have things packed up, so lets send
994 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
997 /* buffer the message to handle re-xmits */
998 dtls1_buffer_message(s, 0);
1001 s->state = SSL3_ST_SW_KEY_EXCH_B;
1002 EVP_MD_CTX_cleanup(&md_ctx);
1003 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1005 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1007 EVP_MD_CTX_cleanup(&md_ctx);
1011 int dtls1_send_certificate_request(SSL *s)
1013 unsigned char *p,*d;
1015 STACK_OF(X509_NAME) *sk=NULL;
1018 unsigned int msg_len;
1020 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1024 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1026 /* get the list of acceptable cert types */
1028 n=ssl3_get_req_cert_type(s,p);
1037 sk=SSL_get_client_CA_list(s);
1041 for (i=0; i<sk_X509_NAME_num(sk); i++)
1043 name=sk_X509_NAME_value(sk,i);
1044 j=i2d_X509_NAME(name,NULL);
1045 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1047 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1050 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1051 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1054 i2d_X509_NAME(name,&p);
1061 i2d_X509_NAME(name,&p);
1062 j-=2; s2n(j,d); j+=2;
1068 /* else no CA names */
1069 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1072 d=(unsigned char *)buf->data;
1073 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1075 s2n(s->d1->handshake_write_seq,d);
1076 s->d1->handshake_write_seq++;
1078 /* we should now have things packed up, so lets send
1081 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1083 #ifdef NETSCAPE_HANG_BUG
1084 /* XXX: what to do about this? */
1085 p=(unsigned char *)s->init_buf->data + s->init_num;
1088 *(p++)=SSL3_MT_SERVER_DONE;
1095 /* XDTLS: set message header ? */
1096 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1097 dtls1_set_message_header(s, (void *)s->init_buf->data,
1098 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1100 /* buffer the message to handle re-xmits */
1101 dtls1_buffer_message(s, 0);
1103 s->state = SSL3_ST_SW_CERT_REQ_B;
1106 /* SSL3_ST_SW_CERT_REQ_B */
1107 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1112 int dtls1_send_server_certificate(SSL *s)
1117 if (s->state == SSL3_ST_SW_CERT_A)
1119 x=ssl_get_server_send_cert(s);
1122 /* VRS: allow null cert if auth == KRB5 */
1123 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1124 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1126 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1131 l=dtls1_output_cert_chain(s,x);
1132 s->state=SSL3_ST_SW_CERT_B;
1136 /* buffer the message to handle re-xmits */
1137 dtls1_buffer_message(s, 0);
1140 /* SSL3_ST_SW_CERT_B */
1141 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));