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 dtls1_start_timer(s);
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;
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 dtls1_start_timer(s);
286 ret = dtls1_send_hello_verify_request(s);
287 if ( ret <= 0) goto end;
288 s->d1->send_cookie = 0;
289 s->state=SSL3_ST_SW_FLUSH;
290 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
292 /* HelloVerifyRequests resets Finished MAC */
293 if (s->client_version != DTLS1_BAD_VER)
294 ssl3_init_finished_mac(s);
297 case SSL3_ST_SW_SRVR_HELLO_A:
298 case SSL3_ST_SW_SRVR_HELLO_B:
299 dtls1_start_timer(s);
300 ret=dtls1_send_server_hello(s);
301 if (ret <= 0) goto end;
304 s->state=SSL3_ST_SW_CHANGE_A;
306 s->state=SSL3_ST_SW_CERT_A;
310 case SSL3_ST_SW_CERT_A:
311 case SSL3_ST_SW_CERT_B:
312 /* Check if it is anon DH */
313 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
315 dtls1_start_timer(s);
316 ret=dtls1_send_server_certificate(s);
317 if (ret <= 0) goto end;
321 s->state=SSL3_ST_SW_KEY_EXCH_A;
325 case SSL3_ST_SW_KEY_EXCH_A:
326 case SSL3_ST_SW_KEY_EXCH_B:
327 l=s->s3->tmp.new_cipher->algorithms;
329 /* clear this, it may get reset by
330 * send_server_key_exchange */
331 if ((s->options & SSL_OP_EPHEMERAL_RSA)
332 #ifndef OPENSSL_NO_KRB5
334 #endif /* OPENSSL_NO_KRB5 */
336 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
337 * even when forbidden by protocol specs
338 * (handshake may fail as clients are not required to
339 * be able to handle this) */
340 s->s3->tmp.use_rsa_tmp=1;
342 s->s3->tmp.use_rsa_tmp=0;
344 /* only send if a DH key exchange, fortezza or
345 * RSA but we have a sign only certificate */
346 if (s->s3->tmp.use_rsa_tmp
347 || (l & (SSL_DH|SSL_kFZA))
349 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
350 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
351 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
357 dtls1_start_timer(s);
358 ret=dtls1_send_server_key_exchange(s);
359 if (ret <= 0) goto end;
364 s->state=SSL3_ST_SW_CERT_REQ_A;
368 case SSL3_ST_SW_CERT_REQ_A:
369 case SSL3_ST_SW_CERT_REQ_B:
370 if (/* don't request cert unless asked for it: */
371 !(s->verify_mode & SSL_VERIFY_PEER) ||
372 /* if SSL_VERIFY_CLIENT_ONCE is set,
373 * don't request cert during re-negotiation: */
374 ((s->session->peer != NULL) &&
375 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
376 /* never request cert in anonymous ciphersuites
377 * (see section "Certificate request" in SSL 3 drafts
378 * and in RFC 2246): */
379 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
380 /* ... except when the application insists on verification
381 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
382 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
383 /* never request cert in Kerberos ciphersuites */
384 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
386 /* no cert request */
388 s->s3->tmp.cert_request=0;
389 s->state=SSL3_ST_SW_SRVR_DONE_A;
393 s->s3->tmp.cert_request=1;
394 dtls1_start_timer(s);
395 ret=dtls1_send_certificate_request(s);
396 if (ret <= 0) goto end;
397 #ifndef NETSCAPE_HANG_BUG
398 s->state=SSL3_ST_SW_SRVR_DONE_A;
400 s->state=SSL3_ST_SW_FLUSH;
401 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
407 case SSL3_ST_SW_SRVR_DONE_A:
408 case SSL3_ST_SW_SRVR_DONE_B:
409 dtls1_start_timer(s);
410 ret=dtls1_send_server_done(s);
411 if (ret <= 0) goto end;
412 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
413 s->state=SSL3_ST_SW_FLUSH;
417 case SSL3_ST_SW_FLUSH:
418 /* number of bytes to be flushed */
419 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
422 s->rwstate=SSL_WRITING;
423 num1=BIO_flush(s->wbio);
424 if (num1 <= 0) { ret= -1; goto end; }
425 s->rwstate=SSL_NOTHING;
428 s->state=s->s3->tmp.next_state;
431 case SSL3_ST_SR_CERT_A:
432 case SSL3_ST_SR_CERT_B:
433 /* Check for second client hello (MS SGC) */
434 ret = ssl3_check_client_hello(s);
439 s->state = SSL3_ST_SR_CLNT_HELLO_C;
441 /* could be sent for a DH cert, even if we
442 * have not asked for it :-) */
443 ret=ssl3_get_client_certificate(s);
444 if (ret <= 0) goto end;
447 s->state=SSL3_ST_SR_KEY_EXCH_A;
451 case SSL3_ST_SR_KEY_EXCH_A:
452 case SSL3_ST_SR_KEY_EXCH_B:
453 ret=ssl3_get_client_key_exchange(s);
454 if (ret <= 0) goto end;
456 s->state=SSL3_ST_SR_CERT_VRFY_A;
459 /* We need to get hashes here so if there is
460 * a client cert, it can be verified */
461 s->method->ssl3_enc->cert_verify_mac(s,
462 &(s->s3->finish_dgst1),
463 &(s->s3->tmp.cert_verify_md[0]));
464 s->method->ssl3_enc->cert_verify_mac(s,
465 &(s->s3->finish_dgst2),
466 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
470 case SSL3_ST_SR_CERT_VRFY_A:
471 case SSL3_ST_SR_CERT_VRFY_B:
473 /* we should decide if we expected this one */
474 ret=ssl3_get_cert_verify(s);
475 if (ret <= 0) goto end;
478 s->state=SSL3_ST_SR_FINISHED_A;
482 case SSL3_ST_SR_FINISHED_A:
483 case SSL3_ST_SR_FINISHED_B:
484 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
485 SSL3_ST_SR_FINISHED_B);
486 if (ret <= 0) goto end;
491 s->state=SSL3_ST_SW_CHANGE_A;
495 case SSL3_ST_SW_CHANGE_A:
496 case SSL3_ST_SW_CHANGE_B:
498 s->session->cipher=s->s3->tmp.new_cipher;
499 if (!s->method->ssl3_enc->setup_key_block(s))
500 { ret= -1; goto end; }
502 ret=dtls1_send_change_cipher_spec(s,
503 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
505 if (ret <= 0) goto end;
506 s->state=SSL3_ST_SW_FINISHED_A;
509 if (!s->method->ssl3_enc->change_cipher_state(s,
510 SSL3_CHANGE_CIPHER_SERVER_WRITE))
516 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
519 case SSL3_ST_SW_FINISHED_A:
520 case SSL3_ST_SW_FINISHED_B:
521 ret=dtls1_send_finished(s,
522 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
523 s->method->ssl3_enc->server_finished_label,
524 s->method->ssl3_enc->server_finished_label_len);
525 if (ret <= 0) goto end;
526 s->state=SSL3_ST_SW_FLUSH;
528 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
530 s->s3->tmp.next_state=SSL_ST_OK;
535 /* clean a few things up */
536 ssl3_cleanup_key_block(s);
539 BUF_MEM_free(s->init_buf);
543 /* remove buffering on output */
544 ssl_free_wbio_buffer(s);
548 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
550 /* actually not necessarily a 'new' session unless
551 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
555 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
557 s->ctx->stats.sess_accept_good++;
559 s->handshake_func=dtls1_accept;
561 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
566 /* done handshaking, next message is client hello */
567 s->d1->handshake_read_seq = 0;
568 /* next message is server hello */
569 s->d1->handshake_write_seq = 0;
570 s->d1->next_handshake_write_seq = 0;
575 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
581 if (!s->s3->tmp.reuse_message && !skip)
585 if ((ret=BIO_flush(s->wbio)) <= 0)
590 if ((cb != NULL) && (s->state != state))
594 cb(s,SSL_CB_ACCEPT_LOOP,1);
601 /* BIO_flush(s->wbio); */
605 cb(s,SSL_CB_ACCEPT_EXIT,ret);
609 int dtls1_send_hello_request(SSL *s)
613 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
615 p=(unsigned char *)s->init_buf->data;
616 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
618 s->state=SSL3_ST_SW_HELLO_REQ_B;
619 /* number of bytes to write */
620 s->init_num=DTLS1_HM_HEADER_LENGTH;
623 /* no need to buffer this message, since there are no retransmit
627 /* SSL3_ST_SW_HELLO_REQ_B */
628 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
631 int dtls1_send_hello_verify_request(SSL *s)
633 unsigned int msg_len;
634 unsigned char *msg, *buf, *p;
636 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
638 buf = (unsigned char *)s->init_buf->data;
640 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
641 if (s->client_version == DTLS1_BAD_VER)
642 *(p++) = DTLS1_BAD_VER>>8,
643 *(p++) = DTLS1_BAD_VER&0xff;
645 *(p++) = s->version >> 8,
646 *(p++) = s->version & 0xFF;
648 if (s->ctx->app_gen_cookie_cb != NULL &&
649 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
650 &(s->d1->cookie_len)) == 0)
652 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
655 /* else the cookie is assumed to have
656 * been initialized by the application */
658 *(p++) = (unsigned char) s->d1->cookie_len;
659 memcpy(p, s->d1->cookie, s->d1->cookie_len);
660 p += s->d1->cookie_len;
663 dtls1_set_message_header(s, buf,
664 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
666 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
667 /* number of bytes to write */
671 /* buffer the message to handle re-xmits */
672 dtls1_buffer_message(s, 0);
675 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
676 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
679 int dtls1_send_server_hello(SSL *s)
685 unsigned long l,Time;
687 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
689 buf=(unsigned char *)s->init_buf->data;
690 p=s->s3->server_random;
691 Time=(unsigned long)time(NULL); /* Time */
693 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
694 /* Do the message type and length last */
695 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
697 if (s->client_version == DTLS1_BAD_VER)
698 *(p++)=DTLS1_BAD_VER>>8,
699 *(p++)=DTLS1_BAD_VER&0xff;
701 *(p++)=s->version>>8,
702 *(p++)=s->version&0xff;
705 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
708 /* now in theory we have 3 options to sending back the
709 * session id. If it is a re-use, we send back the
710 * old session-id, if it is a new session, we send
711 * back the new session-id or we send back a 0 length
712 * session-id if we want it to be single use.
713 * Currently I will not implement the '0' length session-id
714 * 12-Jan-98 - I'll now support the '0' length stuff.
716 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
717 s->session->session_id_length=0;
719 sl=s->session->session_id_length;
720 if (sl > sizeof s->session->session_id)
722 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
726 memcpy(p,s->session->session_id,sl);
730 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
733 /* put the compression method */
734 #ifdef OPENSSL_NO_COMP
737 if (s->s3->tmp.new_compression == NULL)
740 *(p++)=s->s3->tmp.new_compression->id;
747 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
749 s->state=SSL3_ST_SW_SRVR_HELLO_B;
750 /* number of bytes to write */
754 /* buffer the message to handle re-xmits */
755 dtls1_buffer_message(s, 0);
758 /* SSL3_ST_SW_SRVR_HELLO_B */
759 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
762 int dtls1_send_server_done(SSL *s)
766 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
768 p=(unsigned char *)s->init_buf->data;
771 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
773 s->state=SSL3_ST_SW_SRVR_DONE_B;
774 /* number of bytes to write */
775 s->init_num=DTLS1_HM_HEADER_LENGTH;
778 /* buffer the message to handle re-xmits */
779 dtls1_buffer_message(s, 0);
782 /* SSL3_ST_SW_SRVR_DONE_B */
783 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
786 int dtls1_send_server_key_exchange(SSL *s)
788 #ifndef OPENSSL_NO_RSA
792 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
795 #ifndef OPENSSL_NO_DH
809 EVP_MD_CTX_init(&md_ctx);
810 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
812 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
817 r[0]=r[1]=r[2]=r[3]=NULL;
819 #ifndef OPENSSL_NO_RSA
823 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
825 rsa=s->cert->rsa_tmp_cb(s,
826 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
827 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
830 al=SSL_AD_HANDSHAKE_FAILURE;
831 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
839 al=SSL_AD_HANDSHAKE_FAILURE;
840 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
845 s->s3->tmp.use_rsa_tmp=1;
849 #ifndef OPENSSL_NO_DH
853 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
854 dhp=s->cert->dh_tmp_cb(s,
855 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
856 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
859 al=SSL_AD_HANDSHAKE_FAILURE;
860 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
864 if (s->s3->tmp.dh != NULL)
867 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
871 if ((dh=DHparams_dup(dhp)) == NULL)
873 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
878 if ((dhp->pub_key == NULL ||
879 dhp->priv_key == NULL ||
880 (s->options & SSL_OP_SINGLE_DH_USE)))
882 if(!DH_generate_key(dh))
884 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
891 dh->pub_key=BN_dup(dhp->pub_key);
892 dh->priv_key=BN_dup(dhp->priv_key);
893 if ((dh->pub_key == NULL) ||
894 (dh->priv_key == NULL))
896 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
907 al=SSL_AD_HANDSHAKE_FAILURE;
908 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
911 for (i=0; r[i] != NULL; i++)
913 nr[i]=BN_num_bytes(r[i]);
917 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
919 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
922 al=SSL_AD_DECODE_ERROR;
925 kn=EVP_PKEY_size(pkey);
933 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
935 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
938 d=(unsigned char *)s->init_buf->data;
939 p= &(d[DTLS1_HM_HEADER_LENGTH]);
941 for (i=0; r[i] != NULL; i++)
951 /* n is the length of the params, they start at
952 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
954 #ifndef OPENSSL_NO_RSA
955 if (pkey->type == EVP_PKEY_RSA)
959 for (num=2; num > 0; num--)
961 EVP_DigestInit_ex(&md_ctx,(num == 2)
962 ?s->ctx->md5:s->ctx->sha1, NULL);
963 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
964 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
965 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
966 EVP_DigestFinal_ex(&md_ctx,q,
971 if (RSA_sign(NID_md5_sha1, md_buf, j,
972 &(p[2]), &u, pkey->pkey.rsa) <= 0)
974 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
982 #if !defined(OPENSSL_NO_DSA)
983 if (pkey->type == EVP_PKEY_DSA)
986 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
987 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
988 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
989 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
990 if (!EVP_SignFinal(&md_ctx,&(p[2]),
991 (unsigned int *)&i,pkey))
993 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1002 /* Is this error check actually needed? */
1003 al=SSL_AD_HANDSHAKE_FAILURE;
1004 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1009 d = dtls1_set_message_header(s, d,
1010 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1012 /* we should now have things packed up, so lets send
1014 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1017 /* buffer the message to handle re-xmits */
1018 dtls1_buffer_message(s, 0);
1021 s->state = SSL3_ST_SW_KEY_EXCH_B;
1022 EVP_MD_CTX_cleanup(&md_ctx);
1023 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1025 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1027 EVP_MD_CTX_cleanup(&md_ctx);
1031 int dtls1_send_certificate_request(SSL *s)
1033 unsigned char *p,*d;
1035 STACK_OF(X509_NAME) *sk=NULL;
1038 unsigned int msg_len;
1040 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1044 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1046 /* get the list of acceptable cert types */
1048 n=ssl3_get_req_cert_type(s,p);
1057 sk=SSL_get_client_CA_list(s);
1061 for (i=0; i<sk_X509_NAME_num(sk); i++)
1063 name=sk_X509_NAME_value(sk,i);
1064 j=i2d_X509_NAME(name,NULL);
1065 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1067 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1070 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1071 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1074 i2d_X509_NAME(name,&p);
1081 i2d_X509_NAME(name,&p);
1082 j-=2; s2n(j,d); j+=2;
1088 /* else no CA names */
1089 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1092 d=(unsigned char *)buf->data;
1093 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1095 s2n(s->d1->handshake_write_seq,d);
1096 s->d1->handshake_write_seq++;
1098 /* we should now have things packed up, so lets send
1101 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1103 #ifdef NETSCAPE_HANG_BUG
1104 /* XXX: what to do about this? */
1105 p=(unsigned char *)s->init_buf->data + s->init_num;
1108 *(p++)=SSL3_MT_SERVER_DONE;
1115 /* XDTLS: set message header ? */
1116 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1117 dtls1_set_message_header(s, (void *)s->init_buf->data,
1118 SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1120 /* buffer the message to handle re-xmits */
1121 dtls1_buffer_message(s, 0);
1123 s->state = SSL3_ST_SW_CERT_REQ_B;
1126 /* SSL3_ST_SW_CERT_REQ_B */
1127 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1132 int dtls1_send_server_certificate(SSL *s)
1137 if (s->state == SSL3_ST_SW_CERT_A)
1139 x=ssl_get_server_send_cert(s);
1141 /* VRS: allow null cert if auth == KRB5 */
1142 (s->s3->tmp.new_cipher->algorithms
1143 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1144 != (SSL_aKRB5|SSL_kKRB5))
1146 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1150 l=dtls1_output_cert_chain(s,x);
1151 s->state=SSL3_ST_SW_CERT_B;
1155 /* buffer the message to handle re-xmits */
1156 dtls1_buffer_message(s, 0);
1159 /* SSL3_ST_SW_CERT_B */
1160 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));