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 #include <openssl/bn.h>
125 #ifndef OPENSSL_NO_DH
126 #include <openssl/dh.h>
129 static SSL_METHOD *dtls1_get_server_method(int ver);
130 static int dtls1_send_hello_verify_request(SSL *s);
132 static SSL_METHOD *dtls1_get_server_method(int ver)
134 if (ver == DTLS1_VERSION)
135 return(DTLSv1_server_method());
140 SSL_METHOD *DTLSv1_server_method(void)
143 static SSL_METHOD DTLSv1_server_data;
147 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
151 memcpy((char *)&DTLSv1_server_data,(char *)dtlsv1_base_method(),
153 DTLSv1_server_data.ssl_accept=dtls1_accept;
154 DTLSv1_server_data.get_ssl_method=dtls1_get_server_method;
158 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
160 return(&DTLSv1_server_data);
163 int dtls1_accept(SSL *s)
166 unsigned long l,Time=time(NULL);
167 void (*cb)(const SSL *ssl,int type,int val)=NULL;
170 int new_state,state,skip=0;
172 RAND_add(&Time,sizeof(Time),0);
176 if (s->info_callback != NULL)
178 else if (s->ctx->info_callback != NULL)
179 cb=s->ctx->info_callback;
181 /* init things to blank */
183 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
187 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
197 case SSL_ST_RENEGOTIATE:
199 /* s->state=SSL_ST_ACCEPT; */
203 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
204 case SSL_ST_OK|SSL_ST_ACCEPT:
207 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
209 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
211 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
214 s->type=SSL_ST_ACCEPT;
216 if (s->init_buf == NULL)
218 if ((buf=BUF_MEM_new()) == NULL)
223 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
231 if (!ssl3_setup_buffers(s))
239 if (s->state != SSL_ST_RENEGOTIATE)
241 /* Ok, we now need to push on a buffering BIO so that
242 * the output is sent in a way that TCP likes :-)
244 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
246 ssl3_init_finished_mac(s);
247 s->state=SSL3_ST_SR_CLNT_HELLO_A;
248 s->ctx->stats.sess_accept++;
252 /* s->state == SSL_ST_RENEGOTIATE,
253 * we will just send a HelloRequest */
254 s->ctx->stats.sess_accept_renegotiate++;
255 s->state=SSL3_ST_SW_HELLO_REQ_A;
258 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
259 s->d1->send_cookie = 1;
261 s->d1->send_cookie = 0;
265 case SSL3_ST_SW_HELLO_REQ_A:
266 case SSL3_ST_SW_HELLO_REQ_B:
269 ret=dtls1_send_hello_request(s);
270 if (ret <= 0) goto end;
271 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
272 s->state=SSL3_ST_SW_FLUSH;
275 ssl3_init_finished_mac(s);
278 case SSL3_ST_SW_HELLO_REQ_C:
282 case SSL3_ST_SR_CLNT_HELLO_A:
283 case SSL3_ST_SR_CLNT_HELLO_B:
284 case SSL3_ST_SR_CLNT_HELLO_C:
287 ret=ssl3_get_client_hello(s);
288 if (ret <= 0) goto end;
291 if ( s->d1->send_cookie)
292 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
294 s->state = SSL3_ST_SW_SRVR_HELLO_A;
299 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
300 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
302 ret = dtls1_send_hello_verify_request(s);
303 if ( ret <= 0) goto end;
304 s->d1->send_cookie = 0;
305 s->state=SSL3_ST_SW_FLUSH;
306 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
309 case SSL3_ST_SW_SRVR_HELLO_A:
310 case SSL3_ST_SW_SRVR_HELLO_B:
311 ret=dtls1_send_server_hello(s);
312 if (ret <= 0) goto end;
315 s->state=SSL3_ST_SW_CHANGE_A;
317 s->state=SSL3_ST_SW_CERT_A;
321 case SSL3_ST_SW_CERT_A:
322 case SSL3_ST_SW_CERT_B:
323 /* Check if it is anon DH */
324 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
326 ret=dtls1_send_server_certificate(s);
327 if (ret <= 0) goto end;
331 s->state=SSL3_ST_SW_KEY_EXCH_A;
335 case SSL3_ST_SW_KEY_EXCH_A:
336 case SSL3_ST_SW_KEY_EXCH_B:
337 l=s->s3->tmp.new_cipher->algorithms;
339 /* clear this, it may get reset by
340 * send_server_key_exchange */
341 if ((s->options & SSL_OP_EPHEMERAL_RSA)
342 #ifndef OPENSSL_NO_KRB5
344 #endif /* OPENSSL_NO_KRB5 */
346 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
347 * even when forbidden by protocol specs
348 * (handshake may fail as clients are not required to
349 * be able to handle this) */
350 s->s3->tmp.use_rsa_tmp=1;
352 s->s3->tmp.use_rsa_tmp=0;
354 /* only send if a DH key exchange, fortezza or
355 * RSA but we have a sign only certificate */
356 if (s->s3->tmp.use_rsa_tmp
357 || (l & (SSL_DH|SSL_kFZA))
359 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
360 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
361 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
367 ret=dtls1_send_server_key_exchange(s);
368 if (ret <= 0) goto end;
373 s->state=SSL3_ST_SW_CERT_REQ_A;
377 case SSL3_ST_SW_CERT_REQ_A:
378 case SSL3_ST_SW_CERT_REQ_B:
379 if (/* don't request cert unless asked for it: */
380 !(s->verify_mode & SSL_VERIFY_PEER) ||
381 /* if SSL_VERIFY_CLIENT_ONCE is set,
382 * don't request cert during re-negotiation: */
383 ((s->session->peer != NULL) &&
384 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
385 /* never request cert in anonymous ciphersuites
386 * (see section "Certificate request" in SSL 3 drafts
387 * and in RFC 2246): */
388 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
389 /* ... except when the application insists on verification
390 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
391 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
392 /* never request cert in Kerberos ciphersuites */
393 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
395 /* no cert request */
397 s->s3->tmp.cert_request=0;
398 s->state=SSL3_ST_SW_SRVR_DONE_A;
402 s->s3->tmp.cert_request=1;
403 ret=dtls1_send_certificate_request(s);
404 if (ret <= 0) goto end;
405 #ifndef NETSCAPE_HANG_BUG
406 s->state=SSL3_ST_SW_SRVR_DONE_A;
408 s->state=SSL3_ST_SW_FLUSH;
409 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
415 case SSL3_ST_SW_SRVR_DONE_A:
416 case SSL3_ST_SW_SRVR_DONE_B:
417 ret=dtls1_send_server_done(s);
418 if (ret <= 0) goto end;
419 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
420 s->state=SSL3_ST_SW_FLUSH;
424 case SSL3_ST_SW_FLUSH:
425 /* number of bytes to be flushed */
426 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
429 s->rwstate=SSL_WRITING;
430 num1=BIO_flush(s->wbio);
431 if (num1 <= 0) { ret= -1; goto end; }
432 s->rwstate=SSL_NOTHING;
435 s->state=s->s3->tmp.next_state;
438 case SSL3_ST_SR_CERT_A:
439 case SSL3_ST_SR_CERT_B:
440 /* Check for second client hello (MS SGC) */
441 ret = ssl3_check_client_hello(s);
445 s->state = SSL3_ST_SR_CLNT_HELLO_C;
447 /* could be sent for a DH cert, even if we
448 * have not asked for it :-) */
449 ret=ssl3_get_client_certificate(s);
450 if (ret <= 0) goto end;
452 s->state=SSL3_ST_SR_KEY_EXCH_A;
456 case SSL3_ST_SR_KEY_EXCH_A:
457 case SSL3_ST_SR_KEY_EXCH_B:
458 ret=ssl3_get_client_key_exchange(s);
459 if (ret <= 0) goto end;
460 s->state=SSL3_ST_SR_CERT_VRFY_A;
463 /* We need to get hashes here so if there is
464 * a client cert, it can be verified */
465 s->method->ssl3_enc->cert_verify_mac(s,
466 &(s->s3->finish_dgst1),
467 &(s->s3->tmp.cert_verify_md[0]));
468 s->method->ssl3_enc->cert_verify_mac(s,
469 &(s->s3->finish_dgst2),
470 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
474 case SSL3_ST_SR_CERT_VRFY_A:
475 case SSL3_ST_SR_CERT_VRFY_B:
477 /* we should decide if we expected this one */
478 ret=ssl3_get_cert_verify(s);
479 if (ret <= 0) goto end;
481 s->state=SSL3_ST_SR_FINISHED_A;
485 case SSL3_ST_SR_FINISHED_A:
486 case SSL3_ST_SR_FINISHED_B:
487 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
488 SSL3_ST_SR_FINISHED_B);
489 if (ret <= 0) goto end;
493 s->state=SSL3_ST_SW_CHANGE_A;
497 case SSL3_ST_SW_CHANGE_A:
498 case SSL3_ST_SW_CHANGE_B:
500 s->session->cipher=s->s3->tmp.new_cipher;
501 if (!s->method->ssl3_enc->setup_key_block(s))
502 { ret= -1; goto end; }
504 ret=dtls1_send_change_cipher_spec(s,
505 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
507 if (ret <= 0) goto end;
508 s->state=SSL3_ST_SW_FINISHED_A;
511 if (!s->method->ssl3_enc->change_cipher_state(s,
512 SSL3_CHANGE_CIPHER_SERVER_WRITE))
518 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
521 case SSL3_ST_SW_FINISHED_A:
522 case SSL3_ST_SW_FINISHED_B:
523 ret=dtls1_send_finished(s,
524 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
525 s->method->ssl3_enc->server_finished_label,
526 s->method->ssl3_enc->server_finished_label_len);
527 if (ret <= 0) goto end;
528 s->state=SSL3_ST_SW_FLUSH;
530 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
532 s->s3->tmp.next_state=SSL_ST_OK;
537 /* clean a few things up */
538 ssl3_cleanup_key_block(s);
541 BUF_MEM_free(s->init_buf);
545 /* remove buffering on output */
546 ssl_free_wbio_buffer(s);
550 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
552 /* actually not necessarily a 'new' session unless
553 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
557 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
559 s->ctx->stats.sess_accept_good++;
561 s->handshake_func=dtls1_accept;
563 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
568 /* done handshaking, next message is client hello */
569 s->d1->handshake_read_seq = 0;
570 /* next message is server hello */
571 s->d1->handshake_write_seq = 0;
576 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
582 if (!s->s3->tmp.reuse_message && !skip)
586 if ((ret=BIO_flush(s->wbio)) <= 0)
591 if ((cb != NULL) && (s->state != state))
595 cb(s,SSL_CB_ACCEPT_LOOP,1);
602 /* BIO_flush(s->wbio); */
606 cb(s,SSL_CB_ACCEPT_EXIT,ret);
610 int dtls1_send_hello_request(SSL *s)
614 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
616 p=(unsigned char *)s->init_buf->data;
617 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
619 s->state=SSL3_ST_SW_HELLO_REQ_B;
620 /* number of bytes to write */
621 s->init_num=DTLS1_HM_HEADER_LENGTH;
624 /* no need to buffer this message, since there are no retransmit
628 /* SSL3_ST_SW_HELLO_REQ_B */
629 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
632 int dtls1_send_hello_verify_request(SSL *s)
634 unsigned int msg_len;
635 unsigned char *msg, *buf, *p;
637 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
639 buf = (unsigned char *)s->init_buf->data;
641 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
642 *(p++) = s->version >> 8;
643 *(p++) = s->version & 0xFF;
645 *(p++) = (unsigned char) s->d1->cookie_len;
646 if ( s->ctx->app_gen_cookie_cb != NULL &&
647 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
648 &(s->d1->cookie_len)) == 0)
650 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
653 /* else the cookie is assumed to have
654 * been initialized by the application */
656 memcpy(p, s->d1->cookie, s->d1->cookie_len);
657 p += s->d1->cookie_len;
660 dtls1_set_message_header(s, buf,
661 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
663 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
664 /* number of bytes to write */
668 /* buffer the message to handle re-xmits */
669 dtls1_buffer_message(s, 0);
672 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
673 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
676 int dtls1_send_server_hello(SSL *s)
681 unsigned long l,Time;
683 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
685 buf=(unsigned char *)s->init_buf->data;
686 p=s->s3->server_random;
687 Time=time(NULL); /* Time */
689 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
690 /* Do the message type and length last */
691 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
693 *(p++)=s->version>>8;
694 *(p++)=s->version&0xff;
697 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
700 /* now in theory we have 3 options to sending back the
701 * session id. If it is a re-use, we send back the
702 * old session-id, if it is a new session, we send
703 * back the new session-id or we send back a 0 length
704 * session-id if we want it to be single use.
705 * Currently I will not implement the '0' length session-id
706 * 12-Jan-98 - I'll now support the '0' length stuff.
708 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
709 s->session->session_id_length=0;
711 sl=s->session->session_id_length;
712 if (sl > sizeof s->session->session_id)
714 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
718 memcpy(p,s->session->session_id,sl);
722 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
725 /* put the compression method */
726 if (s->s3->tmp.new_compression == NULL)
729 *(p++)=s->s3->tmp.new_compression->id;
735 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
737 s->state=SSL3_ST_CW_CLNT_HELLO_B;
738 /* number of bytes to write */
742 /* buffer the message to handle re-xmits */
743 dtls1_buffer_message(s, 0);
746 /* SSL3_ST_CW_CLNT_HELLO_B */
747 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
750 int dtls1_send_server_done(SSL *s)
754 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
756 p=(unsigned char *)s->init_buf->data;
759 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
761 s->state=SSL3_ST_SW_SRVR_DONE_B;
762 /* number of bytes to write */
763 s->init_num=DTLS1_HM_HEADER_LENGTH;
766 /* buffer the message to handle re-xmits */
767 dtls1_buffer_message(s, 0);
770 /* SSL3_ST_CW_CLNT_HELLO_B */
771 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
774 int dtls1_send_server_key_exchange(SSL *s)
776 #ifndef OPENSSL_NO_RSA
780 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
783 #ifndef OPENSSL_NO_DH
797 EVP_MD_CTX_init(&md_ctx);
798 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
800 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
805 r[0]=r[1]=r[2]=r[3]=NULL;
807 #ifndef OPENSSL_NO_RSA
811 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
813 rsa=s->cert->rsa_tmp_cb(s,
814 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
815 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
818 al=SSL_AD_HANDSHAKE_FAILURE;
819 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
827 al=SSL_AD_HANDSHAKE_FAILURE;
828 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
833 s->s3->tmp.use_rsa_tmp=1;
837 #ifndef OPENSSL_NO_DH
841 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
842 dhp=s->cert->dh_tmp_cb(s,
843 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
844 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
847 al=SSL_AD_HANDSHAKE_FAILURE;
848 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
852 if (s->s3->tmp.dh != NULL)
855 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
859 if ((dh=DHparams_dup(dhp)) == NULL)
861 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
866 if ((dhp->pub_key == NULL ||
867 dhp->priv_key == NULL ||
868 (s->options & SSL_OP_SINGLE_DH_USE)))
870 if(!DH_generate_key(dh))
872 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
879 dh->pub_key=BN_dup(dhp->pub_key);
880 dh->priv_key=BN_dup(dhp->priv_key);
881 if ((dh->pub_key == NULL) ||
882 (dh->priv_key == NULL))
884 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
895 al=SSL_AD_HANDSHAKE_FAILURE;
896 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
899 for (i=0; r[i] != NULL; i++)
901 nr[i]=BN_num_bytes(r[i]);
905 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
907 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
910 al=SSL_AD_DECODE_ERROR;
913 kn=EVP_PKEY_size(pkey);
921 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
923 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
926 d=(unsigned char *)s->init_buf->data;
927 p= &(d[DTLS1_HM_HEADER_LENGTH]);
929 for (i=0; r[i] != NULL; i++)
939 /* n is the length of the params, they start at
940 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
942 #ifndef OPENSSL_NO_RSA
943 if (pkey->type == EVP_PKEY_RSA)
947 for (num=2; num > 0; num--)
949 EVP_DigestInit_ex(&md_ctx,(num == 2)
950 ?s->ctx->md5:s->ctx->sha1, NULL);
951 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
952 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
953 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
954 EVP_DigestFinal_ex(&md_ctx,q,
959 if (RSA_sign(NID_md5_sha1, md_buf, j,
960 &(p[2]), &u, pkey->pkey.rsa) <= 0)
962 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
970 #if !defined(OPENSSL_NO_DSA)
971 if (pkey->type == EVP_PKEY_DSA)
974 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
975 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
976 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
977 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
978 if (!EVP_SignFinal(&md_ctx,&(p[2]),
979 (unsigned int *)&i,pkey))
981 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
990 /* Is this error check actually needed? */
991 al=SSL_AD_HANDSHAKE_FAILURE;
992 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
997 d = dtls1_set_message_header(s, d,
998 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1000 /* we should now have things packed up, so lets send
1002 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1005 /* buffer the message to handle re-xmits */
1006 dtls1_buffer_message(s, 0);
1009 s->state = SSL3_ST_SW_KEY_EXCH_B;
1010 EVP_MD_CTX_cleanup(&md_ctx);
1011 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1013 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1015 EVP_MD_CTX_cleanup(&md_ctx);
1019 int dtls1_send_certificate_request(SSL *s)
1021 unsigned char *p,*d;
1023 STACK_OF(X509_NAME) *sk=NULL;
1027 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1031 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1033 /* get the list of acceptable cert types */
1035 n=ssl3_get_req_cert_type(s,p);
1044 sk=SSL_get_client_CA_list(s);
1048 for (i=0; i<sk_X509_NAME_num(sk); i++)
1050 name=sk_X509_NAME_value(sk,i);
1051 j=i2d_X509_NAME(name,NULL);
1052 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1054 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1057 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1058 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1061 i2d_X509_NAME(name,&p);
1068 i2d_X509_NAME(name,&p);
1069 j-=2; s2n(j,d); j+=2;
1075 /* else no CA names */
1076 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1079 d=(unsigned char *)buf->data;
1080 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1082 s2n(s->d1->handshake_write_seq,d);
1083 s->d1->handshake_write_seq++;
1085 /* we should now have things packed up, so lets send
1088 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1090 #ifdef NETSCAPE_HANG_BUG
1091 /* XXX: what to do about this? */
1092 p=(unsigned char *)s->init_buf->data + s->init_num;
1095 *(p++)=SSL3_MT_SERVER_DONE;
1102 /* XDTLS: set message header ? */
1103 /* buffer the message to handle re-xmits */
1104 dtls1_buffer_message(s, 0);
1106 s->state = SSL3_ST_SW_CERT_REQ_B;
1109 /* SSL3_ST_SW_CERT_REQ_B */
1110 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1115 int dtls1_send_server_certificate(SSL *s)
1120 if (s->state == SSL3_ST_SW_CERT_A)
1122 x=ssl_get_server_send_cert(s);
1124 /* VRS: allow null cert if auth == KRB5 */
1125 (s->s3->tmp.new_cipher->algorithms
1126 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1127 != (SSL_aKRB5|SSL_kKRB5))
1129 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1133 l=dtls1_output_cert_chain(s,x);
1134 s->state=SSL3_ST_SW_CERT_B;
1138 /* buffer the message to handle re-xmits */
1139 dtls1_buffer_message(s, 0);
1142 /* SSL3_ST_SW_CERT_B */
1143 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));