3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
6 /* ====================================================================
7 * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to. The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
73 * Copyright remains Eric Young's, and as such any Copyright notices in
74 * the code are not to be removed.
75 * If this package is used in a product, Eric Young should be given attribution
76 * as the author of the parts of the library used.
77 * This can be in the form of a textual message at program startup or
78 * in documentation (online or textual) provided with the package.
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
83 * 1. Redistributions of source code must retain the copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * "This product includes cryptographic software written by
91 * Eric Young (eay@cryptsoft.com)"
92 * The word 'cryptographic' can be left out if the rouines from the library
93 * being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 * the apps directory (application code) you must include an acknowledgement:
96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
110 * The licence and distribution terms for any publically available version or
111 * derivative of this code cannot be changed. i.e. this code cannot simply be
112 * copied and put under another distribution licence
113 * [including the GNU Public Licence.]
117 #include "ssl_locl.h"
118 #include <openssl/buffer.h>
119 #include <openssl/rand.h>
120 #include <openssl/objects.h>
121 #include <openssl/evp.h>
122 #include <openssl/x509.h>
123 #include <openssl/md5.h>
124 #ifndef OPENSSL_NO_DH
125 #include <openssl/dh.h>
128 static SSL_METHOD *dtls1_get_server_method(int ver);
129 static int dtls1_send_hello_verify_request(SSL *s);
131 static SSL_METHOD *dtls1_get_server_method(int ver)
133 if (ver == DTLS1_VERSION)
134 return(DTLSv1_server_method());
139 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
141 ssl_undefined_function,
142 dtls1_get_server_method)
144 int dtls1_accept(SSL *s)
147 unsigned long l,Time=(unsigned long)time(NULL);
148 void (*cb)(const SSL *ssl,int type,int val)=NULL;
151 int new_state,state,skip=0;
153 RAND_add(&Time,sizeof(Time),0);
157 if (s->info_callback != NULL)
159 else if (s->ctx->info_callback != NULL)
160 cb=s->ctx->info_callback;
162 /* init things to blank */
164 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
168 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
178 case SSL_ST_RENEGOTIATE:
180 /* s->state=SSL_ST_ACCEPT; */
184 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
185 case SSL_ST_OK|SSL_ST_ACCEPT:
188 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
190 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
192 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
195 s->type=SSL_ST_ACCEPT;
197 if (s->init_buf == NULL)
199 if ((buf=BUF_MEM_new()) == NULL)
204 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
212 if (!ssl3_setup_buffers(s))
220 if (s->state != SSL_ST_RENEGOTIATE)
222 /* Ok, we now need to push on a buffering BIO so that
223 * the output is sent in a way that TCP likes :-)
225 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
227 ssl3_init_finished_mac(s);
228 s->state=SSL3_ST_SR_CLNT_HELLO_A;
229 s->ctx->stats.sess_accept++;
233 /* s->state == SSL_ST_RENEGOTIATE,
234 * we will just send a HelloRequest */
235 s->ctx->stats.sess_accept_renegotiate++;
236 s->state=SSL3_ST_SW_HELLO_REQ_A;
239 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
240 s->d1->send_cookie = 1;
242 s->d1->send_cookie = 0;
246 case SSL3_ST_SW_HELLO_REQ_A:
247 case SSL3_ST_SW_HELLO_REQ_B:
250 ret=dtls1_send_hello_request(s);
251 if (ret <= 0) goto end;
252 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
253 s->state=SSL3_ST_SW_FLUSH;
256 ssl3_init_finished_mac(s);
259 case SSL3_ST_SW_HELLO_REQ_C:
263 case SSL3_ST_SR_CLNT_HELLO_A:
264 case SSL3_ST_SR_CLNT_HELLO_B:
265 case SSL3_ST_SR_CLNT_HELLO_C:
268 ret=ssl3_get_client_hello(s);
269 if (ret <= 0) goto end;
272 if ( s->d1->send_cookie)
273 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
275 s->state = SSL3_ST_SW_SRVR_HELLO_A;
280 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
281 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
283 ret = dtls1_send_hello_verify_request(s);
284 if ( ret <= 0) goto end;
285 s->d1->send_cookie = 0;
286 s->state=SSL3_ST_SW_FLUSH;
287 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
290 case SSL3_ST_SW_SRVR_HELLO_A:
291 case SSL3_ST_SW_SRVR_HELLO_B:
292 ret=dtls1_send_server_hello(s);
293 if (ret <= 0) goto end;
296 s->state=SSL3_ST_SW_CHANGE_A;
298 s->state=SSL3_ST_SW_CERT_A;
302 case SSL3_ST_SW_CERT_A:
303 case SSL3_ST_SW_CERT_B:
304 /* Check if it is anon DH */
305 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
307 ret=dtls1_send_server_certificate(s);
308 if (ret <= 0) goto end;
312 s->state=SSL3_ST_SW_KEY_EXCH_A;
316 case SSL3_ST_SW_KEY_EXCH_A:
317 case SSL3_ST_SW_KEY_EXCH_B:
318 l=s->s3->tmp.new_cipher->algorithms;
320 /* clear this, it may get reset by
321 * send_server_key_exchange */
322 if ((s->options & SSL_OP_EPHEMERAL_RSA)
323 #ifndef OPENSSL_NO_KRB5
325 #endif /* OPENSSL_NO_KRB5 */
327 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
328 * even when forbidden by protocol specs
329 * (handshake may fail as clients are not required to
330 * be able to handle this) */
331 s->s3->tmp.use_rsa_tmp=1;
333 s->s3->tmp.use_rsa_tmp=0;
335 /* only send if a DH key exchange, fortezza or
336 * RSA but we have a sign only certificate */
337 if (s->s3->tmp.use_rsa_tmp
338 || (l & (SSL_DH|SSL_kFZA))
340 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
341 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
342 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
348 ret=dtls1_send_server_key_exchange(s);
349 if (ret <= 0) goto end;
354 s->state=SSL3_ST_SW_CERT_REQ_A;
358 case SSL3_ST_SW_CERT_REQ_A:
359 case SSL3_ST_SW_CERT_REQ_B:
360 if (/* don't request cert unless asked for it: */
361 !(s->verify_mode & SSL_VERIFY_PEER) ||
362 /* if SSL_VERIFY_CLIENT_ONCE is set,
363 * don't request cert during re-negotiation: */
364 ((s->session->peer != NULL) &&
365 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
366 /* never request cert in anonymous ciphersuites
367 * (see section "Certificate request" in SSL 3 drafts
368 * and in RFC 2246): */
369 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
370 /* ... except when the application insists on verification
371 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
372 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
373 /* never request cert in Kerberos ciphersuites */
374 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
376 /* no cert request */
378 s->s3->tmp.cert_request=0;
379 s->state=SSL3_ST_SW_SRVR_DONE_A;
383 s->s3->tmp.cert_request=1;
384 ret=dtls1_send_certificate_request(s);
385 if (ret <= 0) goto end;
386 #ifndef NETSCAPE_HANG_BUG
387 s->state=SSL3_ST_SW_SRVR_DONE_A;
389 s->state=SSL3_ST_SW_FLUSH;
390 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
396 case SSL3_ST_SW_SRVR_DONE_A:
397 case SSL3_ST_SW_SRVR_DONE_B:
398 ret=dtls1_send_server_done(s);
399 if (ret <= 0) goto end;
400 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
401 s->state=SSL3_ST_SW_FLUSH;
405 case SSL3_ST_SW_FLUSH:
406 /* number of bytes to be flushed */
407 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
410 s->rwstate=SSL_WRITING;
411 num1=BIO_flush(s->wbio);
412 if (num1 <= 0) { ret= -1; goto end; }
413 s->rwstate=SSL_NOTHING;
416 s->state=s->s3->tmp.next_state;
419 case SSL3_ST_SR_CERT_A:
420 case SSL3_ST_SR_CERT_B:
421 /* Check for second client hello (MS SGC) */
422 ret = ssl3_check_client_hello(s);
426 s->state = SSL3_ST_SR_CLNT_HELLO_C;
428 /* could be sent for a DH cert, even if we
429 * have not asked for it :-) */
430 ret=ssl3_get_client_certificate(s);
431 if (ret <= 0) goto end;
433 s->state=SSL3_ST_SR_KEY_EXCH_A;
437 case SSL3_ST_SR_KEY_EXCH_A:
438 case SSL3_ST_SR_KEY_EXCH_B:
439 ret=ssl3_get_client_key_exchange(s);
440 if (ret <= 0) goto end;
441 s->state=SSL3_ST_SR_CERT_VRFY_A;
444 /* We need to get hashes here so if there is
445 * a client cert, it can be verified */
446 s->method->ssl3_enc->cert_verify_mac(s,
447 &(s->s3->finish_dgst1),
448 &(s->s3->tmp.cert_verify_md[0]));
449 s->method->ssl3_enc->cert_verify_mac(s,
450 &(s->s3->finish_dgst2),
451 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
455 case SSL3_ST_SR_CERT_VRFY_A:
456 case SSL3_ST_SR_CERT_VRFY_B:
458 /* we should decide if we expected this one */
459 ret=ssl3_get_cert_verify(s);
460 if (ret <= 0) goto end;
462 s->state=SSL3_ST_SR_FINISHED_A;
466 case SSL3_ST_SR_FINISHED_A:
467 case SSL3_ST_SR_FINISHED_B:
468 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
469 SSL3_ST_SR_FINISHED_B);
470 if (ret <= 0) goto end;
474 s->state=SSL3_ST_SW_CHANGE_A;
478 case SSL3_ST_SW_CHANGE_A:
479 case SSL3_ST_SW_CHANGE_B:
481 s->session->cipher=s->s3->tmp.new_cipher;
482 if (!s->method->ssl3_enc->setup_key_block(s))
483 { ret= -1; goto end; }
485 ret=dtls1_send_change_cipher_spec(s,
486 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
488 if (ret <= 0) goto end;
489 s->state=SSL3_ST_SW_FINISHED_A;
492 if (!s->method->ssl3_enc->change_cipher_state(s,
493 SSL3_CHANGE_CIPHER_SERVER_WRITE))
499 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
502 case SSL3_ST_SW_FINISHED_A:
503 case SSL3_ST_SW_FINISHED_B:
504 ret=dtls1_send_finished(s,
505 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
506 s->method->ssl3_enc->server_finished_label,
507 s->method->ssl3_enc->server_finished_label_len);
508 if (ret <= 0) goto end;
509 s->state=SSL3_ST_SW_FLUSH;
511 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
513 s->s3->tmp.next_state=SSL_ST_OK;
518 /* clean a few things up */
519 ssl3_cleanup_key_block(s);
522 BUF_MEM_free(s->init_buf);
526 /* remove buffering on output */
527 ssl_free_wbio_buffer(s);
531 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
533 /* actually not necessarily a 'new' session unless
534 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
538 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
540 s->ctx->stats.sess_accept_good++;
542 s->handshake_func=dtls1_accept;
544 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
549 /* done handshaking, next message is client hello */
550 s->d1->handshake_read_seq = 0;
551 /* next message is server hello */
552 s->d1->handshake_write_seq = 0;
557 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
563 if (!s->s3->tmp.reuse_message && !skip)
567 if ((ret=BIO_flush(s->wbio)) <= 0)
572 if ((cb != NULL) && (s->state != state))
576 cb(s,SSL_CB_ACCEPT_LOOP,1);
583 /* BIO_flush(s->wbio); */
587 cb(s,SSL_CB_ACCEPT_EXIT,ret);
591 int dtls1_send_hello_request(SSL *s)
595 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
597 p=(unsigned char *)s->init_buf->data;
598 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
600 s->state=SSL3_ST_SW_HELLO_REQ_B;
601 /* number of bytes to write */
602 s->init_num=DTLS1_HM_HEADER_LENGTH;
605 /* no need to buffer this message, since there are no retransmit
609 /* SSL3_ST_SW_HELLO_REQ_B */
610 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
613 int dtls1_send_hello_verify_request(SSL *s)
615 unsigned int msg_len;
616 unsigned char *msg, *buf, *p;
618 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
620 buf = (unsigned char *)s->init_buf->data;
622 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
623 *(p++) = s->version >> 8;
624 *(p++) = s->version & 0xFF;
626 *(p++) = (unsigned char) s->d1->cookie_len;
627 if ( s->ctx->app_gen_cookie_cb != NULL &&
628 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
629 &(s->d1->cookie_len)) == 0)
631 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
634 /* else the cookie is assumed to have
635 * been initialized by the application */
637 memcpy(p, s->d1->cookie, s->d1->cookie_len);
638 p += s->d1->cookie_len;
641 dtls1_set_message_header(s, buf,
642 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
644 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
645 /* number of bytes to write */
649 /* buffer the message to handle re-xmits */
650 dtls1_buffer_message(s, 0);
653 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
654 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
657 int dtls1_send_server_hello(SSL *s)
663 unsigned long l,Time;
665 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
667 buf=(unsigned char *)s->init_buf->data;
668 p=s->s3->server_random;
669 Time=(unsigned long)time(NULL); /* Time */
671 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
672 /* Do the message type and length last */
673 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
675 *(p++)=s->version>>8;
676 *(p++)=s->version&0xff;
679 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
682 /* now in theory we have 3 options to sending back the
683 * session id. If it is a re-use, we send back the
684 * old session-id, if it is a new session, we send
685 * back the new session-id or we send back a 0 length
686 * session-id if we want it to be single use.
687 * Currently I will not implement the '0' length session-id
688 * 12-Jan-98 - I'll now support the '0' length stuff.
690 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
691 s->session->session_id_length=0;
693 sl=s->session->session_id_length;
694 if (sl > sizeof s->session->session_id)
696 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
700 memcpy(p,s->session->session_id,sl);
704 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
707 /* put the compression method */
708 #ifdef OPENSSL_NO_COMP
711 if (s->s3->tmp.new_compression == NULL)
714 *(p++)=s->s3->tmp.new_compression->id;
721 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
723 s->state=SSL3_ST_CW_CLNT_HELLO_B;
724 /* number of bytes to write */
728 /* buffer the message to handle re-xmits */
729 dtls1_buffer_message(s, 0);
732 /* SSL3_ST_CW_CLNT_HELLO_B */
733 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
736 int dtls1_send_server_done(SSL *s)
740 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
742 p=(unsigned char *)s->init_buf->data;
745 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
747 s->state=SSL3_ST_SW_SRVR_DONE_B;
748 /* number of bytes to write */
749 s->init_num=DTLS1_HM_HEADER_LENGTH;
752 /* buffer the message to handle re-xmits */
753 dtls1_buffer_message(s, 0);
756 /* SSL3_ST_CW_CLNT_HELLO_B */
757 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
760 int dtls1_send_server_key_exchange(SSL *s)
762 #ifndef OPENSSL_NO_RSA
766 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
769 #ifndef OPENSSL_NO_DH
783 EVP_MD_CTX_init(&md_ctx);
784 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
786 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
791 r[0]=r[1]=r[2]=r[3]=NULL;
793 #ifndef OPENSSL_NO_RSA
797 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
799 rsa=s->cert->rsa_tmp_cb(s,
800 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
801 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
804 al=SSL_AD_HANDSHAKE_FAILURE;
805 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
813 al=SSL_AD_HANDSHAKE_FAILURE;
814 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
819 s->s3->tmp.use_rsa_tmp=1;
823 #ifndef OPENSSL_NO_DH
827 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
828 dhp=s->cert->dh_tmp_cb(s,
829 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
830 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
833 al=SSL_AD_HANDSHAKE_FAILURE;
834 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
838 if (s->s3->tmp.dh != NULL)
841 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
845 if ((dh=DHparams_dup(dhp)) == NULL)
847 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
852 if ((dhp->pub_key == NULL ||
853 dhp->priv_key == NULL ||
854 (s->options & SSL_OP_SINGLE_DH_USE)))
856 if(!DH_generate_key(dh))
858 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
865 dh->pub_key=BN_dup(dhp->pub_key);
866 dh->priv_key=BN_dup(dhp->priv_key);
867 if ((dh->pub_key == NULL) ||
868 (dh->priv_key == NULL))
870 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
881 al=SSL_AD_HANDSHAKE_FAILURE;
882 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
885 for (i=0; r[i] != NULL; i++)
887 nr[i]=BN_num_bytes(r[i]);
891 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
893 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
896 al=SSL_AD_DECODE_ERROR;
899 kn=EVP_PKEY_size(pkey);
907 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
909 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
912 d=(unsigned char *)s->init_buf->data;
913 p= &(d[DTLS1_HM_HEADER_LENGTH]);
915 for (i=0; r[i] != NULL; i++)
925 /* n is the length of the params, they start at
926 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
928 #ifndef OPENSSL_NO_RSA
929 if (pkey->type == EVP_PKEY_RSA)
933 for (num=2; num > 0; num--)
935 EVP_DigestInit_ex(&md_ctx,(num == 2)
936 ?s->ctx->md5:s->ctx->sha1, NULL);
937 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
938 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
939 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
940 EVP_DigestFinal_ex(&md_ctx,q,
945 if (RSA_sign(NID_md5_sha1, md_buf, j,
946 &(p[2]), &u, pkey->pkey.rsa) <= 0)
948 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
956 #if !defined(OPENSSL_NO_DSA)
957 if (pkey->type == EVP_PKEY_DSA)
960 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
961 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
962 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
963 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
964 if (!EVP_SignFinal(&md_ctx,&(p[2]),
965 (unsigned int *)&i,pkey))
967 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
976 /* Is this error check actually needed? */
977 al=SSL_AD_HANDSHAKE_FAILURE;
978 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
983 d = dtls1_set_message_header(s, d,
984 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
986 /* we should now have things packed up, so lets send
988 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
991 /* buffer the message to handle re-xmits */
992 dtls1_buffer_message(s, 0);
995 s->state = SSL3_ST_SW_KEY_EXCH_B;
996 EVP_MD_CTX_cleanup(&md_ctx);
997 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
999 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1001 EVP_MD_CTX_cleanup(&md_ctx);
1005 int dtls1_send_certificate_request(SSL *s)
1007 unsigned char *p,*d;
1009 STACK_OF(X509_NAME) *sk=NULL;
1013 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1017 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1019 /* get the list of acceptable cert types */
1021 n=ssl3_get_req_cert_type(s,p);
1030 sk=SSL_get_client_CA_list(s);
1034 for (i=0; i<sk_X509_NAME_num(sk); i++)
1036 name=sk_X509_NAME_value(sk,i);
1037 j=i2d_X509_NAME(name,NULL);
1038 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1040 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1043 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1044 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1047 i2d_X509_NAME(name,&p);
1054 i2d_X509_NAME(name,&p);
1055 j-=2; s2n(j,d); j+=2;
1061 /* else no CA names */
1062 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1065 d=(unsigned char *)buf->data;
1066 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1068 s2n(s->d1->handshake_write_seq,d);
1069 s->d1->handshake_write_seq++;
1071 /* we should now have things packed up, so lets send
1074 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1076 #ifdef NETSCAPE_HANG_BUG
1077 /* XXX: what to do about this? */
1078 p=(unsigned char *)s->init_buf->data + s->init_num;
1081 *(p++)=SSL3_MT_SERVER_DONE;
1088 /* XDTLS: set message header ? */
1089 /* buffer the message to handle re-xmits */
1090 dtls1_buffer_message(s, 0);
1092 s->state = SSL3_ST_SW_CERT_REQ_B;
1095 /* SSL3_ST_SW_CERT_REQ_B */
1096 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1101 int dtls1_send_server_certificate(SSL *s)
1106 if (s->state == SSL3_ST_SW_CERT_A)
1108 x=ssl_get_server_send_cert(s);
1110 /* VRS: allow null cert if auth == KRB5 */
1111 (s->s3->tmp.new_cipher->algorithms
1112 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1113 != (SSL_aKRB5|SSL_kKRB5))
1115 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1119 l=dtls1_output_cert_chain(s,x);
1120 s->state=SSL3_ST_SW_CERT_B;
1124 /* buffer the message to handle re-xmits */
1125 dtls1_buffer_message(s, 0);
1128 /* SSL3_ST_SW_CERT_B */
1129 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));