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 #ifndef OPENSSL_NO_DH
125 #include <openssl/dh.h>
128 static const SSL_METHOD *dtls1_get_server_method(int ver);
129 static int dtls1_send_hello_verify_request(SSL *s);
131 static const 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 Time=(unsigned long)time(NULL);
148 void (*cb)(const SSL *ssl,int type,int val)=NULL;
152 int new_state,state,skip=0;
154 RAND_add(&Time,sizeof(Time),0);
158 if (s->info_callback != NULL)
160 else if (s->ctx->info_callback != NULL)
161 cb=s->ctx->info_callback;
163 /* init things to blank */
165 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
169 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
179 case SSL_ST_RENEGOTIATE:
181 /* s->state=SSL_ST_ACCEPT; */
185 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
186 case SSL_ST_OK|SSL_ST_ACCEPT:
189 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
191 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
193 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
196 s->type=SSL_ST_ACCEPT;
198 if (s->init_buf == NULL)
200 if ((buf=BUF_MEM_new()) == NULL)
205 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
213 if (!ssl3_setup_buffers(s))
221 if (s->state != SSL_ST_RENEGOTIATE)
223 /* Ok, we now need to push on a buffering BIO so that
224 * the output is sent in a way that TCP likes :-)
226 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
228 ssl3_init_finished_mac(s);
229 s->state=SSL3_ST_SR_CLNT_HELLO_A;
230 s->ctx->stats.sess_accept++;
234 /* s->state == SSL_ST_RENEGOTIATE,
235 * we will just send a HelloRequest */
236 s->ctx->stats.sess_accept_renegotiate++;
237 s->state=SSL3_ST_SW_HELLO_REQ_A;
240 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
241 s->d1->send_cookie = 1;
243 s->d1->send_cookie = 0;
247 case SSL3_ST_SW_HELLO_REQ_A:
248 case SSL3_ST_SW_HELLO_REQ_B:
251 ret=dtls1_send_hello_request(s);
252 if (ret <= 0) goto end;
253 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
254 s->state=SSL3_ST_SW_FLUSH;
257 ssl3_init_finished_mac(s);
260 case SSL3_ST_SW_HELLO_REQ_C:
264 case SSL3_ST_SR_CLNT_HELLO_A:
265 case SSL3_ST_SR_CLNT_HELLO_B:
266 case SSL3_ST_SR_CLNT_HELLO_C:
269 ret=ssl3_get_client_hello(s);
270 if (ret <= 0) goto end;
273 if (s->d1->send_cookie)
274 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
276 s->state = SSL3_ST_SW_SRVR_HELLO_A;
281 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
282 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
284 ret = dtls1_send_hello_verify_request(s);
285 if ( ret <= 0) goto end;
286 s->d1->send_cookie = 0;
287 s->state=SSL3_ST_SW_FLUSH;
288 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
290 /* HelloVerifyRequest resets Finished MAC */
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->algorithm_auth & 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 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
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
328 && !(alg_k & SSL_kKRB5)
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 or
340 * RSA but we have a sign only certificate */
341 if (s->s3->tmp.use_rsa_tmp
342 || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
343 || ((alg_k & SSL_kRSA)
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->algorithm_auth & 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->algorithm_auth & 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,
452 &(s->s3->tmp.cert_verify_md[0]));
453 s->method->ssl3_enc->cert_verify_mac(s,
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 *(p++) = s->version >> 8;
628 *(p++) = s->version & 0xFF;
630 if (s->ctx->app_gen_cookie_cb != NULL &&
631 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
632 &(s->d1->cookie_len)) == 0)
634 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
637 /* else the cookie is assumed to have
638 * been initialized by the application */
640 *(p++) = (unsigned char) s->d1->cookie_len;
641 memcpy(p, s->d1->cookie, s->d1->cookie_len);
642 p += s->d1->cookie_len;
645 dtls1_set_message_header(s, buf,
646 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
648 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
649 /* number of bytes to write */
653 /* buffer the message to handle re-xmits */
654 dtls1_buffer_message(s, 0);
657 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
658 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
661 int dtls1_send_server_hello(SSL *s)
667 unsigned long l,Time;
669 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
671 buf=(unsigned char *)s->init_buf->data;
672 p=s->s3->server_random;
673 Time=(unsigned long)time(NULL); /* Time */
675 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
676 /* Do the message type and length last */
677 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
679 *(p++)=s->version>>8;
680 *(p++)=s->version&0xff;
683 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
686 /* now in theory we have 3 options to sending back the
687 * session id. If it is a re-use, we send back the
688 * old session-id, if it is a new session, we send
689 * back the new session-id or we send back a 0 length
690 * session-id if we want it to be single use.
691 * Currently I will not implement the '0' length session-id
692 * 12-Jan-98 - I'll now support the '0' length stuff.
694 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
695 s->session->session_id_length=0;
697 sl=s->session->session_id_length;
698 if (sl > sizeof s->session->session_id)
700 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
704 memcpy(p,s->session->session_id,sl);
708 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
711 /* put the compression method */
712 #ifdef OPENSSL_NO_COMP
715 if (s->s3->tmp.new_compression == NULL)
718 *(p++)=s->s3->tmp.new_compression->id;
725 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
727 s->state=SSL3_ST_CW_CLNT_HELLO_B;
728 /* number of bytes to write */
732 /* buffer the message to handle re-xmits */
733 dtls1_buffer_message(s, 0);
736 /* SSL3_ST_CW_CLNT_HELLO_B */
737 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
740 int dtls1_send_server_done(SSL *s)
744 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
746 p=(unsigned char *)s->init_buf->data;
749 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
751 s->state=SSL3_ST_SW_SRVR_DONE_B;
752 /* number of bytes to write */
753 s->init_num=DTLS1_HM_HEADER_LENGTH;
756 /* buffer the message to handle re-xmits */
757 dtls1_buffer_message(s, 0);
760 /* SSL3_ST_CW_CLNT_HELLO_B */
761 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
764 int dtls1_send_server_key_exchange(SSL *s)
766 #ifndef OPENSSL_NO_RSA
770 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
773 #ifndef OPENSSL_NO_DH
787 EVP_MD_CTX_init(&md_ctx);
788 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
790 type=s->s3->tmp.new_cipher->algorithm_mkey;
795 r[0]=r[1]=r[2]=r[3]=NULL;
797 #ifndef OPENSSL_NO_RSA
801 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
803 rsa=s->cert->rsa_tmp_cb(s,
804 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
805 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
808 al=SSL_AD_HANDSHAKE_FAILURE;
809 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
817 al=SSL_AD_HANDSHAKE_FAILURE;
818 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
823 s->s3->tmp.use_rsa_tmp=1;
827 #ifndef OPENSSL_NO_DH
831 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
832 dhp=s->cert->dh_tmp_cb(s,
833 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
834 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
837 al=SSL_AD_HANDSHAKE_FAILURE;
838 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
842 if (s->s3->tmp.dh != NULL)
845 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
849 if ((dh=DHparams_dup(dhp)) == NULL)
851 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
856 if ((dhp->pub_key == NULL ||
857 dhp->priv_key == NULL ||
858 (s->options & SSL_OP_SINGLE_DH_USE)))
860 if(!DH_generate_key(dh))
862 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
869 dh->pub_key=BN_dup(dhp->pub_key);
870 dh->priv_key=BN_dup(dhp->priv_key);
871 if ((dh->pub_key == NULL) ||
872 (dh->priv_key == NULL))
874 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
885 al=SSL_AD_HANDSHAKE_FAILURE;
886 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
889 for (i=0; r[i] != NULL; i++)
891 nr[i]=BN_num_bytes(r[i]);
895 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
897 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
900 al=SSL_AD_DECODE_ERROR;
903 kn=EVP_PKEY_size(pkey);
911 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
913 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
916 d=(unsigned char *)s->init_buf->data;
917 p= &(d[DTLS1_HM_HEADER_LENGTH]);
919 for (i=0; r[i] != NULL; i++)
929 /* n is the length of the params, they start at
930 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
932 #ifndef OPENSSL_NO_RSA
933 if (pkey->type == EVP_PKEY_RSA)
937 for (num=2; num > 0; num--)
939 EVP_DigestInit_ex(&md_ctx,(num == 2)
940 ?s->ctx->md5:s->ctx->sha1, NULL);
941 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
942 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
943 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
944 EVP_DigestFinal_ex(&md_ctx,q,
949 if (RSA_sign(NID_md5_sha1, md_buf, j,
950 &(p[2]), &u, pkey->pkey.rsa) <= 0)
952 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
960 #if !defined(OPENSSL_NO_DSA)
961 if (pkey->type == EVP_PKEY_DSA)
964 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
965 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
966 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
967 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
968 if (!EVP_SignFinal(&md_ctx,&(p[2]),
969 (unsigned int *)&i,pkey))
971 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
980 /* Is this error check actually needed? */
981 al=SSL_AD_HANDSHAKE_FAILURE;
982 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
987 d = dtls1_set_message_header(s, d,
988 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
990 /* we should now have things packed up, so lets send
992 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
995 /* buffer the message to handle re-xmits */
996 dtls1_buffer_message(s, 0);
999 s->state = SSL3_ST_SW_KEY_EXCH_B;
1000 EVP_MD_CTX_cleanup(&md_ctx);
1001 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1003 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1005 EVP_MD_CTX_cleanup(&md_ctx);
1009 int dtls1_send_certificate_request(SSL *s)
1011 unsigned char *p,*d;
1013 STACK_OF(X509_NAME) *sk=NULL;
1016 unsigned int msg_len;
1018 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1022 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1024 /* get the list of acceptable cert types */
1026 n=ssl3_get_req_cert_type(s,p);
1035 sk=SSL_get_client_CA_list(s);
1039 for (i=0; i<sk_X509_NAME_num(sk); i++)
1041 name=sk_X509_NAME_value(sk,i);
1042 j=i2d_X509_NAME(name,NULL);
1043 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1045 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1048 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1049 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1052 i2d_X509_NAME(name,&p);
1059 i2d_X509_NAME(name,&p);
1060 j-=2; s2n(j,d); j+=2;
1066 /* else no CA names */
1067 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1070 d=(unsigned char *)buf->data;
1071 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1073 s2n(s->d1->handshake_write_seq,d);
1074 s->d1->handshake_write_seq++;
1076 /* we should now have things packed up, so lets send
1079 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1081 #ifdef NETSCAPE_HANG_BUG
1082 /* XXX: what to do about this? */
1083 p=(unsigned char *)s->init_buf->data + s->init_num;
1086 *(p++)=SSL3_MT_SERVER_DONE;
1093 /* XDTLS: set message header ? */
1094 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1095 dtls1_set_message_header(s, (void *)s->init_buf->data,
1096 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1098 /* buffer the message to handle re-xmits */
1099 dtls1_buffer_message(s, 0);
1101 s->state = SSL3_ST_SW_CERT_REQ_B;
1104 /* SSL3_ST_SW_CERT_REQ_B */
1105 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1110 int dtls1_send_server_certificate(SSL *s)
1115 if (s->state == SSL3_ST_SW_CERT_A)
1117 x=ssl_get_server_send_cert(s);
1120 /* VRS: allow null cert if auth == KRB5 */
1121 if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1122 (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1124 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1129 l=dtls1_output_cert_chain(s,x);
1130 s->state=SSL3_ST_SW_CERT_B;
1134 /* buffer the message to handle re-xmits */
1135 dtls1_buffer_message(s, 0);
1138 /* SSL3_ST_SW_CERT_B */
1139 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));