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>
125 static SSL_METHOD *dtls1_get_server_method(int ver);
126 static int dtls1_send_hello_verify_request(SSL *s);
128 static SSL_METHOD *dtls1_get_server_method(int ver)
130 if (ver == DTLS1_VERSION)
131 return(DTLSv1_server_method());
136 SSL_METHOD *DTLSv1_server_method(void)
139 static SSL_METHOD DTLSv1_server_data;
143 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
147 memcpy((char *)&DTLSv1_server_data,(char *)dtlsv1_base_method(),
149 DTLSv1_server_data.ssl_accept=dtls1_accept;
150 DTLSv1_server_data.get_ssl_method=dtls1_get_server_method;
154 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
156 return(&DTLSv1_server_data);
159 int dtls1_accept(SSL *s)
162 unsigned long l,Time=time(NULL);
163 void (*cb)(const SSL *ssl,int type,int val)=NULL;
166 int new_state,state,skip=0;
168 RAND_add(&Time,sizeof(Time),0);
172 if (s->info_callback != NULL)
174 else if (s->ctx->info_callback != NULL)
175 cb=s->ctx->info_callback;
177 /* init things to blank */
179 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
183 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
193 case SSL_ST_RENEGOTIATE:
195 /* s->state=SSL_ST_ACCEPT; */
199 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
200 case SSL_ST_OK|SSL_ST_ACCEPT:
203 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
205 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
207 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
210 s->type=SSL_ST_ACCEPT;
212 if (s->init_buf == NULL)
214 if ((buf=BUF_MEM_new()) == NULL)
219 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
227 if (!ssl3_setup_buffers(s))
235 if (s->state != SSL_ST_RENEGOTIATE)
237 /* Ok, we now need to push on a buffering BIO so that
238 * the output is sent in a way that TCP likes :-)
240 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
242 ssl3_init_finished_mac(s);
243 s->state=SSL3_ST_SR_CLNT_HELLO_A;
244 s->ctx->stats.sess_accept++;
248 /* s->state == SSL_ST_RENEGOTIATE,
249 * we will just send a HelloRequest */
250 s->ctx->stats.sess_accept_renegotiate++;
251 s->state=SSL3_ST_SW_HELLO_REQ_A;
254 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
255 s->d1->send_cookie = 1;
257 s->d1->send_cookie = 0;
261 case SSL3_ST_SW_HELLO_REQ_A:
262 case SSL3_ST_SW_HELLO_REQ_B:
265 ret=dtls1_send_hello_request(s);
266 if (ret <= 0) goto end;
267 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
268 s->state=SSL3_ST_SW_FLUSH;
271 ssl3_init_finished_mac(s);
274 case SSL3_ST_SW_HELLO_REQ_C:
278 case SSL3_ST_SR_CLNT_HELLO_A:
279 case SSL3_ST_SR_CLNT_HELLO_B:
280 case SSL3_ST_SR_CLNT_HELLO_C:
283 ret=ssl3_get_client_hello(s);
284 if (ret <= 0) goto end;
287 if ( s->d1->send_cookie)
288 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
290 s->state = SSL3_ST_SW_SRVR_HELLO_A;
295 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
296 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
298 ret = dtls1_send_hello_verify_request(s);
299 if ( ret <= 0) goto end;
300 s->d1->send_cookie = 0;
301 s->state=SSL3_ST_SW_FLUSH;
302 s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
305 case SSL3_ST_SW_SRVR_HELLO_A:
306 case SSL3_ST_SW_SRVR_HELLO_B:
307 ret=dtls1_send_server_hello(s);
308 if (ret <= 0) goto end;
311 s->state=SSL3_ST_SW_CHANGE_A;
313 s->state=SSL3_ST_SW_CERT_A;
317 case SSL3_ST_SW_CERT_A:
318 case SSL3_ST_SW_CERT_B:
319 /* Check if it is anon DH */
320 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
322 ret=dtls1_send_server_certificate(s);
323 if (ret <= 0) goto end;
327 s->state=SSL3_ST_SW_KEY_EXCH_A;
331 case SSL3_ST_SW_KEY_EXCH_A:
332 case SSL3_ST_SW_KEY_EXCH_B:
333 l=s->s3->tmp.new_cipher->algorithms;
335 /* clear this, it may get reset by
336 * send_server_key_exchange */
337 if ((s->options & SSL_OP_EPHEMERAL_RSA)
338 #ifndef OPENSSL_NO_KRB5
340 #endif /* OPENSSL_NO_KRB5 */
342 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
343 * even when forbidden by protocol specs
344 * (handshake may fail as clients are not required to
345 * be able to handle this) */
346 s->s3->tmp.use_rsa_tmp=1;
348 s->s3->tmp.use_rsa_tmp=0;
350 /* only send if a DH key exchange, fortezza or
351 * RSA but we have a sign only certificate */
352 if (s->s3->tmp.use_rsa_tmp
353 || (l & (SSL_DH|SSL_kFZA))
355 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
356 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
357 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
363 ret=dtls1_send_server_key_exchange(s);
364 if (ret <= 0) goto end;
369 s->state=SSL3_ST_SW_CERT_REQ_A;
373 case SSL3_ST_SW_CERT_REQ_A:
374 case SSL3_ST_SW_CERT_REQ_B:
375 if (/* don't request cert unless asked for it: */
376 !(s->verify_mode & SSL_VERIFY_PEER) ||
377 /* if SSL_VERIFY_CLIENT_ONCE is set,
378 * don't request cert during re-negotiation: */
379 ((s->session->peer != NULL) &&
380 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
381 /* never request cert in anonymous ciphersuites
382 * (see section "Certificate request" in SSL 3 drafts
383 * and in RFC 2246): */
384 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
385 /* ... except when the application insists on verification
386 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
387 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
388 /* never request cert in Kerberos ciphersuites */
389 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
391 /* no cert request */
393 s->s3->tmp.cert_request=0;
394 s->state=SSL3_ST_SW_SRVR_DONE_A;
398 s->s3->tmp.cert_request=1;
399 ret=dtls1_send_certificate_request(s);
400 if (ret <= 0) goto end;
401 #ifndef NETSCAPE_HANG_BUG
402 s->state=SSL3_ST_SW_SRVR_DONE_A;
404 s->state=SSL3_ST_SW_FLUSH;
405 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
411 case SSL3_ST_SW_SRVR_DONE_A:
412 case SSL3_ST_SW_SRVR_DONE_B:
413 ret=dtls1_send_server_done(s);
414 if (ret <= 0) goto end;
415 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
416 s->state=SSL3_ST_SW_FLUSH;
420 case SSL3_ST_SW_FLUSH:
421 /* number of bytes to be flushed */
422 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
425 s->rwstate=SSL_WRITING;
426 num1=BIO_flush(s->wbio);
427 if (num1 <= 0) { ret= -1; goto end; }
428 s->rwstate=SSL_NOTHING;
431 s->state=s->s3->tmp.next_state;
434 case SSL3_ST_SR_CERT_A:
435 case SSL3_ST_SR_CERT_B:
436 /* Check for second client hello (MS SGC) */
437 ret = ssl3_check_client_hello(s);
441 s->state = SSL3_ST_SR_CLNT_HELLO_C;
443 /* could be sent for a DH cert, even if we
444 * have not asked for it :-) */
445 ret=ssl3_get_client_certificate(s);
446 if (ret <= 0) goto end;
448 s->state=SSL3_ST_SR_KEY_EXCH_A;
452 case SSL3_ST_SR_KEY_EXCH_A:
453 case SSL3_ST_SR_KEY_EXCH_B:
454 ret=ssl3_get_client_key_exchange(s);
455 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;
477 s->state=SSL3_ST_SR_FINISHED_A;
481 case SSL3_ST_SR_FINISHED_A:
482 case SSL3_ST_SR_FINISHED_B:
483 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
484 SSL3_ST_SR_FINISHED_B);
485 if (ret <= 0) goto end;
489 s->state=SSL3_ST_SW_CHANGE_A;
493 case SSL3_ST_SW_CHANGE_A:
494 case SSL3_ST_SW_CHANGE_B:
496 s->session->cipher=s->s3->tmp.new_cipher;
497 if (!s->method->ssl3_enc->setup_key_block(s))
498 { ret= -1; goto end; }
500 ret=dtls1_send_change_cipher_spec(s,
501 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
503 if (ret <= 0) goto end;
504 s->state=SSL3_ST_SW_FINISHED_A;
507 if (!s->method->ssl3_enc->change_cipher_state(s,
508 SSL3_CHANGE_CIPHER_SERVER_WRITE))
514 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
517 case SSL3_ST_SW_FINISHED_A:
518 case SSL3_ST_SW_FINISHED_B:
519 ret=dtls1_send_finished(s,
520 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
521 s->method->ssl3_enc->server_finished_label,
522 s->method->ssl3_enc->server_finished_label_len);
523 if (ret <= 0) goto end;
524 s->state=SSL3_ST_SW_FLUSH;
526 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
528 s->s3->tmp.next_state=SSL_ST_OK;
533 /* clean a few things up */
534 ssl3_cleanup_key_block(s);
537 BUF_MEM_free(s->init_buf);
541 /* remove buffering on output */
542 ssl_free_wbio_buffer(s);
546 if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
548 /* actually not necessarily a 'new' session unless
549 * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
553 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
555 s->ctx->stats.sess_accept_good++;
557 s->handshake_func=dtls1_accept;
559 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
564 /* done handshaking, next message is client hello */
565 s->d1->handshake_read_seq = 0;
566 /* next message is server hello */
567 s->d1->handshake_write_seq = 0;
572 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
578 if (!s->s3->tmp.reuse_message && !skip)
582 if ((ret=BIO_flush(s->wbio)) <= 0)
587 if ((cb != NULL) && (s->state != state))
591 cb(s,SSL_CB_ACCEPT_LOOP,1);
598 /* BIO_flush(s->wbio); */
602 cb(s,SSL_CB_ACCEPT_EXIT,ret);
606 int dtls1_send_hello_request(SSL *s)
610 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
612 p=(unsigned char *)s->init_buf->data;
613 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
615 s->state=SSL3_ST_SW_HELLO_REQ_B;
616 /* number of bytes to write */
617 s->init_num=DTLS1_HM_HEADER_LENGTH;
620 /* no need to buffer this message, since there are no retransmit
624 /* SSL3_ST_SW_HELLO_REQ_B */
625 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
628 int dtls1_send_hello_verify_request(SSL *s)
630 unsigned int msg_len;
631 unsigned char *msg, *buf, *p;
633 if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
635 buf = (unsigned char *)s->init_buf->data;
637 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
638 *(p++) = s->version >> 8;
639 *(p++) = s->version & 0xFF;
641 *(p++) = (unsigned char) s->d1->cookie_len;
642 if ( s->ctx->app_gen_cookie_cb != NULL &&
643 s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
644 &(s->d1->cookie_len)) == 0)
646 SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
649 /* else the cookie is assumed to have
650 * been initialized by the application */
652 memcpy(p, s->d1->cookie, s->d1->cookie_len);
653 p += s->d1->cookie_len;
656 dtls1_set_message_header(s, buf,
657 DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
659 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
660 /* number of bytes to write */
664 /* buffer the message to handle re-xmits */
665 dtls1_buffer_message(s, 0);
668 /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
669 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
672 int dtls1_send_server_hello(SSL *s)
677 unsigned long l,Time;
679 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
681 buf=(unsigned char *)s->init_buf->data;
682 p=s->s3->server_random;
683 Time=time(NULL); /* Time */
685 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
686 /* Do the message type and length last */
687 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
689 *(p++)=s->version>>8;
690 *(p++)=s->version&0xff;
693 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
696 /* now in theory we have 3 options to sending back the
697 * session id. If it is a re-use, we send back the
698 * old session-id, if it is a new session, we send
699 * back the new session-id or we send back a 0 length
700 * session-id if we want it to be single use.
701 * Currently I will not implement the '0' length session-id
702 * 12-Jan-98 - I'll now support the '0' length stuff.
704 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
705 s->session->session_id_length=0;
707 sl=s->session->session_id_length;
708 if (sl > sizeof s->session->session_id)
710 SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
714 memcpy(p,s->session->session_id,sl);
718 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
721 /* put the compression method */
722 if (s->s3->tmp.new_compression == NULL)
725 *(p++)=s->s3->tmp.new_compression->id;
731 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
733 s->state=SSL3_ST_CW_CLNT_HELLO_B;
734 /* number of bytes to write */
738 /* buffer the message to handle re-xmits */
739 dtls1_buffer_message(s, 0);
742 /* SSL3_ST_CW_CLNT_HELLO_B */
743 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
746 int dtls1_send_server_done(SSL *s)
750 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
752 p=(unsigned char *)s->init_buf->data;
755 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
757 s->state=SSL3_ST_SW_SRVR_DONE_B;
758 /* number of bytes to write */
759 s->init_num=DTLS1_HM_HEADER_LENGTH;
762 /* buffer the message to handle re-xmits */
763 dtls1_buffer_message(s, 0);
766 /* SSL3_ST_CW_CLNT_HELLO_B */
767 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
770 int dtls1_send_server_key_exchange(SSL *s)
772 #ifndef OPENSSL_NO_RSA
776 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
779 #ifndef OPENSSL_NO_DH
793 EVP_MD_CTX_init(&md_ctx);
794 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
796 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
801 r[0]=r[1]=r[2]=r[3]=NULL;
803 #ifndef OPENSSL_NO_RSA
807 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
809 rsa=s->cert->rsa_tmp_cb(s,
810 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
811 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
814 al=SSL_AD_HANDSHAKE_FAILURE;
815 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
823 al=SSL_AD_HANDSHAKE_FAILURE;
824 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
829 s->s3->tmp.use_rsa_tmp=1;
833 #ifndef OPENSSL_NO_DH
837 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
838 dhp=s->cert->dh_tmp_cb(s,
839 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
840 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
843 al=SSL_AD_HANDSHAKE_FAILURE;
844 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
848 if (s->s3->tmp.dh != NULL)
851 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
855 if ((dh=DHparams_dup(dhp)) == NULL)
857 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
862 if ((dhp->pub_key == NULL ||
863 dhp->priv_key == NULL ||
864 (s->options & SSL_OP_SINGLE_DH_USE)))
866 if(!DH_generate_key(dh))
868 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
875 dh->pub_key=BN_dup(dhp->pub_key);
876 dh->priv_key=BN_dup(dhp->priv_key);
877 if ((dh->pub_key == NULL) ||
878 (dh->priv_key == NULL))
880 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
891 al=SSL_AD_HANDSHAKE_FAILURE;
892 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
895 for (i=0; r[i] != NULL; i++)
897 nr[i]=BN_num_bytes(r[i]);
901 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
903 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
906 al=SSL_AD_DECODE_ERROR;
909 kn=EVP_PKEY_size(pkey);
917 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
919 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
922 d=(unsigned char *)s->init_buf->data;
923 p= &(d[DTLS1_HM_HEADER_LENGTH]);
925 for (i=0; r[i] != NULL; i++)
935 /* n is the length of the params, they start at
936 * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
938 #ifndef OPENSSL_NO_RSA
939 if (pkey->type == EVP_PKEY_RSA)
943 for (num=2; num > 0; num--)
945 EVP_DigestInit_ex(&md_ctx,(num == 2)
946 ?s->ctx->md5:s->ctx->sha1, NULL);
947 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
948 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
949 EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
950 EVP_DigestFinal_ex(&md_ctx,q,
955 if (RSA_sign(NID_md5_sha1, md_buf, j,
956 &(p[2]), &u, pkey->pkey.rsa) <= 0)
958 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
966 #if !defined(OPENSSL_NO_DSA)
967 if (pkey->type == EVP_PKEY_DSA)
970 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
971 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
972 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
973 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
974 if (!EVP_SignFinal(&md_ctx,&(p[2]),
975 (unsigned int *)&i,pkey))
977 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
986 /* Is this error check actually needed? */
987 al=SSL_AD_HANDSHAKE_FAILURE;
988 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
993 d = dtls1_set_message_header(s, d,
994 SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
996 /* we should now have things packed up, so lets send
998 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1001 /* buffer the message to handle re-xmits */
1002 dtls1_buffer_message(s, 0);
1005 s->state = SSL3_ST_SW_KEY_EXCH_B;
1006 EVP_MD_CTX_cleanup(&md_ctx);
1007 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1009 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1011 EVP_MD_CTX_cleanup(&md_ctx);
1015 int dtls1_send_certificate_request(SSL *s)
1017 unsigned char *p,*d;
1019 STACK_OF(X509_NAME) *sk=NULL;
1023 if (s->state == SSL3_ST_SW_CERT_REQ_A)
1027 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1029 /* get the list of acceptable cert types */
1031 n=ssl3_get_req_cert_type(s,p);
1040 sk=SSL_get_client_CA_list(s);
1044 for (i=0; i<sk_X509_NAME_num(sk); i++)
1046 name=sk_X509_NAME_value(sk,i);
1047 j=i2d_X509_NAME(name,NULL);
1048 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1050 SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1053 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1054 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1057 i2d_X509_NAME(name,&p);
1064 i2d_X509_NAME(name,&p);
1065 j-=2; s2n(j,d); j+=2;
1071 /* else no CA names */
1072 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1075 d=(unsigned char *)buf->data;
1076 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1078 l2n(s->d1->handshake_write_seq,d);
1079 s->d1->handshake_write_seq++;
1081 /* we should now have things packed up, so lets send
1084 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1086 #ifdef NETSCAPE_HANG_BUG
1087 /* XXX: what to do about this? */
1088 p=(unsigned char *)s->init_buf->data + s->init_num;
1091 *(p++)=SSL3_MT_SERVER_DONE;
1098 /* XDTLS: set message header ? */
1099 /* buffer the message to handle re-xmits */
1100 dtls1_buffer_message(s, 0);
1102 s->state = SSL3_ST_SW_CERT_REQ_B;
1105 /* SSL3_ST_SW_CERT_REQ_B */
1106 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1111 int dtls1_send_server_certificate(SSL *s)
1116 if (s->state == SSL3_ST_SW_CERT_A)
1118 x=ssl_get_server_send_cert(s);
1120 /* VRS: allow null cert if auth == KRB5 */
1121 (s->s3->tmp.new_cipher->algorithms
1122 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1123 != (SSL_aKRB5|SSL_kKRB5))
1125 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));