ac09b45ef186d6b868cdeeca3dab09677cd29af4
[openssl.git] / ssl / d1_srvr.c
1 /* ssl/d1_srvr.c */
2 /* 
3  * DTLS implementation written by Nagendra Modadugu
4  * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.  
5  */
6 /* ====================================================================
7  * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer. 
15  *
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
19  *    distribution.
20  *
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/)"
25  *
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.
30  *
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.
34  *
35  * 6. Redistributions of any form whatsoever must retain the following
36  *    acknowledgment:
37  *    "This product includes software developed by the OpenSSL Project
38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39  *
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  * ====================================================================
53  *
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).
57  *
58  */
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60  * All rights reserved.
61  *
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.
65  * 
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).
72  * 
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.
79  * 
80  * Redistribution and use in source and binary forms, with or without
81  * modification, are permitted provided that the following conditions
82  * are met:
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)"
97  * 
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
108  * SUCH DAMAGE.
109  * 
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.]
114  */
115
116 #include <stdio.h>
117 #include "ssl_locl.h"
118 #include <openssl/buffer.h>
119 #include <openssl/rand.h>
120 #include <openssl/objects.h>
121 #include <openssl/evp.h>
122 #include <openssl/x509.h>
123 #include <openssl/md5.h>
124 #include <openssl/bn.h>
125 #ifndef OPENSSL_NO_DH
126 #include <openssl/dh.h>
127 #endif
128
129 static const SSL_METHOD *dtls1_get_server_method(int ver);
130 static int dtls1_send_hello_verify_request(SSL *s);
131
132 static const SSL_METHOD *dtls1_get_server_method(int ver)
133         {
134         if (ver == DTLS1_VERSION)
135                 return(DTLSv1_server_method());
136         else
137                 return(NULL);
138         }
139
140 IMPLEMENT_dtls1_meth_func(DTLSv1_server_method,
141                         dtls1_accept,
142                         ssl_undefined_function,
143                         dtls1_get_server_method)
144
145 int dtls1_accept(SSL *s)
146         {
147         BUF_MEM *buf;
148         unsigned long Time=(unsigned long)time(NULL);
149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
150         long num1;
151         unsigned long alg_k;
152         int ret= -1;
153         int new_state,state,skip=0;
154
155         RAND_add(&Time,sizeof(Time),0);
156         ERR_clear_error();
157         clear_sys_error();
158
159         if (s->info_callback != NULL)
160                 cb=s->info_callback;
161         else if (s->ctx->info_callback != NULL)
162                 cb=s->ctx->info_callback;
163
164         /* init things to blank */
165         s->in_handshake++;
166         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
167
168         if (s->cert == NULL)
169                 {
170                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
171                 return(-1);
172                 }
173
174         for (;;)
175                 {
176                 state=s->state;
177
178                 switch (s->state)
179                         {
180                 case SSL_ST_RENEGOTIATE:
181                         s->new_session=1;
182                         /* s->state=SSL_ST_ACCEPT; */
183
184                 case SSL_ST_BEFORE:
185                 case SSL_ST_ACCEPT:
186                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
187                 case SSL_ST_OK|SSL_ST_ACCEPT:
188
189                         s->server=1;
190                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
191
192                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
193                                 {
194                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
195                                 return -1;
196                                 }
197                         s->type=SSL_ST_ACCEPT;
198
199                         if (s->init_buf == NULL)
200                                 {
201                                 if ((buf=BUF_MEM_new()) == NULL)
202                                         {
203                                         ret= -1;
204                                         goto end;
205                                         }
206                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
207                                         {
208                                         ret= -1;
209                                         goto end;
210                                         }
211                                 s->init_buf=buf;
212                                 }
213
214                         if (!ssl3_setup_buffers(s))
215                                 {
216                                 ret= -1;
217                                 goto end;
218                                 }
219
220                         s->init_num=0;
221
222                         if (s->state != SSL_ST_RENEGOTIATE)
223                                 {
224                                 /* Ok, we now need to push on a buffering BIO so that
225                                  * the output is sent in a way that TCP likes :-)
226                                  */
227                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
228
229                                 ssl3_init_finished_mac(s);
230                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
231                                 s->ctx->stats.sess_accept++;
232                                 }
233                         else
234                                 {
235                                 /* s->state == SSL_ST_RENEGOTIATE,
236                                  * we will just send a HelloRequest */
237                                 s->ctx->stats.sess_accept_renegotiate++;
238                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
239                                 }
240
241                         if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
242                                 s->d1->send_cookie = 1;
243                         else
244                                 s->d1->send_cookie = 0;
245                         
246                         break;
247
248                 case SSL3_ST_SW_HELLO_REQ_A:
249                 case SSL3_ST_SW_HELLO_REQ_B:
250
251                         s->shutdown=0;
252                         dtls1_start_timer(s);
253                         ret=dtls1_send_hello_request(s);
254                         if (ret <= 0) goto end;
255                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
256                         s->state=SSL3_ST_SW_FLUSH;
257                         s->init_num=0;
258
259                         ssl3_init_finished_mac(s);
260                         break;
261
262                 case SSL3_ST_SW_HELLO_REQ_C:
263                         s->state=SSL_ST_OK;
264                         break;
265
266                 case SSL3_ST_SR_CLNT_HELLO_A:
267                 case SSL3_ST_SR_CLNT_HELLO_B:
268                 case SSL3_ST_SR_CLNT_HELLO_C:
269
270                         s->shutdown=0;
271                         ret=ssl3_get_client_hello(s);
272                         if (ret <= 0) goto end;
273                         dtls1_stop_timer(s);
274                         s->new_session = 2;
275
276                         if (s->d1->send_cookie)
277                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
278                         else
279                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
280
281                         s->init_num=0;
282                         break;
283                         
284                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
285                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
286
287                         dtls1_start_timer(s);
288                         ret = dtls1_send_hello_verify_request(s);
289                         if ( ret <= 0) goto end;
290                         s->d1->send_cookie = 0;
291                         s->state=SSL3_ST_SW_FLUSH;
292                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
293
294                         /* HelloVerifyRequest resets Finished MAC */
295                         if (s->version != DTLS1_BAD_VER)
296                                 ssl3_init_finished_mac(s);
297                         break;
298                         
299                 case SSL3_ST_SW_SRVR_HELLO_A:
300                 case SSL3_ST_SW_SRVR_HELLO_B:
301                         dtls1_start_timer(s);
302                         ret=dtls1_send_server_hello(s);
303                         if (ret <= 0) goto end;
304
305                         if (s->hit)
306                                 s->state=SSL3_ST_SW_CHANGE_A;
307                         else
308                                 s->state=SSL3_ST_SW_CERT_A;
309                         s->init_num=0;
310                         break;
311
312                 case SSL3_ST_SW_CERT_A:
313                 case SSL3_ST_SW_CERT_B:
314                         /* Check if it is anon DH or normal PSK */
315                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
316                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
317                                 {
318                                 dtls1_start_timer(s);
319                                 ret=dtls1_send_server_certificate(s);
320                                 if (ret <= 0) goto end;
321                                 }
322                         else
323                                 skip=1;
324                         s->state=SSL3_ST_SW_KEY_EXCH_A;
325                         s->init_num=0;
326                         break;
327
328                 case SSL3_ST_SW_KEY_EXCH_A:
329                 case SSL3_ST_SW_KEY_EXCH_B:
330                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
331
332                         /* clear this, it may get reset by
333                          * send_server_key_exchange */
334                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
335 #ifndef OPENSSL_NO_KRB5
336                                 && !(alg_k & SSL_kKRB5)
337 #endif /* OPENSSL_NO_KRB5 */
338                                 )
339                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
340                                  * even when forbidden by protocol specs
341                                  * (handshake may fail as clients are not required to
342                                  * be able to handle this) */
343                                 s->s3->tmp.use_rsa_tmp=1;
344                         else
345                                 s->s3->tmp.use_rsa_tmp=0;
346
347                         /* only send if a DH key exchange or
348                          * RSA but we have a sign only certificate */
349                         if (s->s3->tmp.use_rsa_tmp
350                         /* PSK: send ServerKeyExchange if PSK identity
351                          * hint if provided */
352 #ifndef OPENSSL_NO_PSK
353                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
354 #endif
355                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
356                             || (alg_k & SSL_kEECDH)
357                             || ((alg_k & SSL_kRSA)
358                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
359                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
360                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
361                                         )
362                                     )
363                                 )
364                             )
365                                 {
366                                 dtls1_start_timer(s);
367                                 ret=dtls1_send_server_key_exchange(s);
368                                 if (ret <= 0) goto end;
369                                 }
370                         else
371                                 skip=1;
372
373                         s->state=SSL3_ST_SW_CERT_REQ_A;
374                         s->init_num=0;
375                         break;
376
377                 case SSL3_ST_SW_CERT_REQ_A:
378                 case SSL3_ST_SW_CERT_REQ_B:
379                         if (/* don't request cert unless asked for it: */
380                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
381                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
382                                  * don't request cert during re-negotiation: */
383                                 ((s->session->peer != NULL) &&
384                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
385                                 /* never request cert in anonymous ciphersuites
386                                  * (see section "Certificate request" in SSL 3 drafts
387                                  * and in RFC 2246): */
388                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
389                                  /* ... except when the application insists on verification
390                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
391                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
392                                  /* never request cert in Kerberos ciphersuites */
393                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
394                                 /* With normal PSK Certificates and
395                                  * Certificate Requests are omitted */
396                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
397                                 {
398                                 /* no cert request */
399                                 skip=1;
400                                 s->s3->tmp.cert_request=0;
401                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
402                                 }
403                         else
404                                 {
405                                 s->s3->tmp.cert_request=1;
406                                 dtls1_start_timer(s);
407                                 ret=dtls1_send_certificate_request(s);
408                                 if (ret <= 0) goto end;
409 #ifndef NETSCAPE_HANG_BUG
410                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
411 #else
412                                 s->state=SSL3_ST_SW_FLUSH;
413                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
414 #endif
415                                 s->init_num=0;
416                                 }
417                         break;
418
419                 case SSL3_ST_SW_SRVR_DONE_A:
420                 case SSL3_ST_SW_SRVR_DONE_B:
421                         dtls1_start_timer(s);
422                         ret=dtls1_send_server_done(s);
423                         if (ret <= 0) goto end;
424                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
425                         s->state=SSL3_ST_SW_FLUSH;
426                         s->init_num=0;
427                         break;
428                 
429                 case SSL3_ST_SW_FLUSH:
430                         /* number of bytes to be flushed */
431                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
432                         if (num1 > 0)
433                                 {
434                                 s->rwstate=SSL_WRITING;
435                                 num1=BIO_flush(s->wbio);
436                                 if (num1 <= 0) { ret= -1; goto end; }
437                                 s->rwstate=SSL_NOTHING;
438                                 }
439
440                         s->state=s->s3->tmp.next_state;
441                         break;
442
443                 case SSL3_ST_SR_CERT_A:
444                 case SSL3_ST_SR_CERT_B:
445                         /* Check for second client hello (MS SGC) */
446                         ret = ssl3_check_client_hello(s);
447                         if (ret <= 0)
448                                 goto end;
449                         dtls1_stop_timer(s);
450                         if (ret == 2)
451                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
452                         else {
453                                 /* could be sent for a DH cert, even if we
454                                  * have not asked for it :-) */
455                                 ret=ssl3_get_client_certificate(s);
456                                 if (ret <= 0) goto end;
457                                 dtls1_stop_timer(s);
458                                 s->init_num=0;
459                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
460                         }
461                         break;
462
463                 case SSL3_ST_SR_KEY_EXCH_A:
464                 case SSL3_ST_SR_KEY_EXCH_B:
465                         ret=ssl3_get_client_key_exchange(s);
466                         if (ret <= 0) goto end;
467                         dtls1_stop_timer(s);
468                         s->state=SSL3_ST_SR_CERT_VRFY_A;
469                         s->init_num=0;
470
471                         if (ret == 2)
472                                 {
473                                 /* For the ECDH ciphersuites when
474                                  * the client sends its ECDH pub key in
475                                  * a certificate, the CertificateVerify
476                                  * message is not sent.
477                                  */
478                                 s->state=SSL3_ST_SR_FINISHED_A;
479                                 s->init_num = 0;
480                                 }
481                         else
482                                 {
483                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
484                                 s->init_num=0;
485
486                                 /* We need to get hashes here so if there is
487                                  * a client cert, it can be verified */ 
488                                 s->method->ssl3_enc->cert_verify_mac(s,
489                                         NID_md5,
490                                         &(s->s3->tmp.cert_verify_md[0]));
491                                 s->method->ssl3_enc->cert_verify_mac(s,
492                                         NID_sha1,
493                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
494                                 }
495                         break;
496
497                 case SSL3_ST_SR_CERT_VRFY_A:
498                 case SSL3_ST_SR_CERT_VRFY_B:
499
500                         s->d1->change_cipher_spec_ok = 1;
501                         /* we should decide if we expected this one */
502                         ret=ssl3_get_cert_verify(s);
503                         if (ret <= 0) goto end;
504                         dtls1_stop_timer(s);
505
506                         s->state=SSL3_ST_SR_FINISHED_A;
507                         s->init_num=0;
508                         break;
509
510                 case SSL3_ST_SR_FINISHED_A:
511                 case SSL3_ST_SR_FINISHED_B:
512                         s->d1->change_cipher_spec_ok = 1;
513                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
514                                 SSL3_ST_SR_FINISHED_B);
515                         if (ret <= 0) goto end;
516                         dtls1_stop_timer(s);
517                         if (s->hit)
518                                 s->state=SSL_ST_OK;
519                         else
520                                 s->state=SSL3_ST_SW_CHANGE_A;
521                         s->init_num=0;
522                         break;
523
524                 case SSL3_ST_SW_CHANGE_A:
525                 case SSL3_ST_SW_CHANGE_B:
526
527                         s->session->cipher=s->s3->tmp.new_cipher;
528                         if (!s->method->ssl3_enc->setup_key_block(s))
529                                 { ret= -1; goto end; }
530
531                         ret=dtls1_send_change_cipher_spec(s,
532                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
533
534                         if (ret <= 0) goto end;
535                         s->state=SSL3_ST_SW_FINISHED_A;
536                         s->init_num=0;
537
538                         if (!s->method->ssl3_enc->change_cipher_state(s,
539                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
540                                 {
541                                 ret= -1;
542                                 goto end;
543                                 }
544
545                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
546                         break;
547
548                 case SSL3_ST_SW_FINISHED_A:
549                 case SSL3_ST_SW_FINISHED_B:
550                         ret=dtls1_send_finished(s,
551                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
552                                 s->method->ssl3_enc->server_finished_label,
553                                 s->method->ssl3_enc->server_finished_label_len);
554                         if (ret <= 0) goto end;
555                         s->state=SSL3_ST_SW_FLUSH;
556                         if (s->hit)
557                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
558                         else
559                                 s->s3->tmp.next_state=SSL_ST_OK;
560                         s->init_num=0;
561                         break;
562
563                 case SSL_ST_OK:
564                         /* clean a few things up */
565                         ssl3_cleanup_key_block(s);
566
567 #if 0
568                         BUF_MEM_free(s->init_buf);
569                         s->init_buf=NULL;
570 #endif
571
572                         /* remove buffering on output */
573                         ssl_free_wbio_buffer(s);
574
575                         s->init_num=0;
576
577                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
578                                 {
579                                 /* actually not necessarily a 'new' session unless
580                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
581                                 
582                                 s->new_session=0;
583                                 
584                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
585                                 
586                                 s->ctx->stats.sess_accept_good++;
587                                 /* s->server=1; */
588                                 s->handshake_func=dtls1_accept;
589
590                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
591                                 }
592                         
593                         ret = 1;
594
595                         /* done handshaking, next message is client hello */
596                         s->d1->handshake_read_seq = 0;
597                         /* next message is server hello */
598                         s->d1->handshake_write_seq = 0;
599                         s->d1->next_handshake_write_seq = 0;
600                         goto end;
601                         /* break; */
602
603                 default:
604                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
605                         ret= -1;
606                         goto end;
607                         /* break; */
608                         }
609                 
610                 if (!s->s3->tmp.reuse_message && !skip)
611                         {
612                         if (s->debug)
613                                 {
614                                 if ((ret=BIO_flush(s->wbio)) <= 0)
615                                         goto end;
616                                 }
617
618
619                         if ((cb != NULL) && (s->state != state))
620                                 {
621                                 new_state=s->state;
622                                 s->state=state;
623                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
624                                 s->state=new_state;
625                                 }
626                         }
627                 skip=0;
628                 }
629 end:
630         /* BIO_flush(s->wbio); */
631
632         s->in_handshake--;
633         if (cb != NULL)
634                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
635         return(ret);
636         }
637
638 int dtls1_send_hello_request(SSL *s)
639         {
640         unsigned char *p;
641
642         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
643                 {
644                 p=(unsigned char *)s->init_buf->data;
645                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
646
647                 s->state=SSL3_ST_SW_HELLO_REQ_B;
648                 /* number of bytes to write */
649                 s->init_num=DTLS1_HM_HEADER_LENGTH;
650                 s->init_off=0;
651
652                 /* no need to buffer this message, since there are no retransmit 
653                  * requests for it */
654                 }
655
656         /* SSL3_ST_SW_HELLO_REQ_B */
657         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
658         }
659
660 int dtls1_send_hello_verify_request(SSL *s)
661         {
662         unsigned int msg_len;
663         unsigned char *msg, *buf, *p;
664
665         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
666                 {
667                 buf = (unsigned char *)s->init_buf->data;
668
669                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
670                 *(p++) = s->version >> 8;
671                 *(p++) = s->version & 0xFF;
672
673                 if (s->ctx->app_gen_cookie_cb != NULL &&
674                     s->ctx->app_gen_cookie_cb(s, s->d1->cookie, 
675                         &(s->d1->cookie_len)) == 0)
676                         {
677                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
678                         return 0;
679                         }
680                 /* else the cookie is assumed to have 
681                  * been initialized by the application */
682
683                 *(p++) = (unsigned char) s->d1->cookie_len;
684                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
685                 p += s->d1->cookie_len;
686                 msg_len = p - msg;
687
688                 dtls1_set_message_header(s, buf,
689                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
690
691                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
692                 /* number of bytes to write */
693                 s->init_num=p-buf;
694                 s->init_off=0;
695
696                 /* buffer the message to handle re-xmits */
697                 dtls1_buffer_message(s, 0);
698                 }
699
700         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
701         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
702         }
703
704 int dtls1_send_server_hello(SSL *s)
705         {
706         unsigned char *buf;
707         unsigned char *p,*d;
708         int i;
709         unsigned int sl;
710         unsigned long l,Time;
711
712         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
713                 {
714                 buf=(unsigned char *)s->init_buf->data;
715                 p=s->s3->server_random;
716                 Time=(unsigned long)time(NULL);                 /* Time */
717                 l2n(Time,p);
718                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
719                 /* Do the message type and length last */
720                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
721
722                 *(p++)=s->version>>8;
723                 *(p++)=s->version&0xff;
724
725                 /* Random stuff */
726                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
727                 p+=SSL3_RANDOM_SIZE;
728
729                 /* now in theory we have 3 options to sending back the
730                  * session id.  If it is a re-use, we send back the
731                  * old session-id, if it is a new session, we send
732                  * back the new session-id or we send back a 0 length
733                  * session-id if we want it to be single use.
734                  * Currently I will not implement the '0' length session-id
735                  * 12-Jan-98 - I'll now support the '0' length stuff.
736                  */
737                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
738                         s->session->session_id_length=0;
739
740                 sl=s->session->session_id_length;
741                 if (sl > sizeof s->session->session_id)
742                         {
743                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
744                         return -1;
745                         }
746                 *(p++)=sl;
747                 memcpy(p,s->session->session_id,sl);
748                 p+=sl;
749
750                 /* put the cipher */
751                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
752                 p+=i;
753
754                 /* put the compression method */
755 #ifdef OPENSSL_NO_COMP
756                 *(p++)=0;
757 #else
758                 if (s->s3->tmp.new_compression == NULL)
759                         *(p++)=0;
760                 else
761                         *(p++)=s->s3->tmp.new_compression->id;
762 #endif
763
764                 /* do the header */
765                 l=(p-d);
766                 d=buf;
767
768                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
769
770                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
771                 /* number of bytes to write */
772                 s->init_num=p-buf;
773                 s->init_off=0;
774
775                 /* buffer the message to handle re-xmits */
776                 dtls1_buffer_message(s, 0);
777                 }
778
779         /* SSL3_ST_SW_SRVR_HELLO_B */
780         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
781         }
782
783 int dtls1_send_server_done(SSL *s)
784         {
785         unsigned char *p;
786
787         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
788                 {
789                 p=(unsigned char *)s->init_buf->data;
790
791                 /* do the header */
792                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
793
794                 s->state=SSL3_ST_SW_SRVR_DONE_B;
795                 /* number of bytes to write */
796                 s->init_num=DTLS1_HM_HEADER_LENGTH;
797                 s->init_off=0;
798
799                 /* buffer the message to handle re-xmits */
800                 dtls1_buffer_message(s, 0);
801                 }
802
803         /* SSL3_ST_SW_SRVR_DONE_B */
804         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
805         }
806
807 int dtls1_send_server_key_exchange(SSL *s)
808         {
809 #ifndef OPENSSL_NO_RSA
810         unsigned char *q;
811         int j,num;
812         RSA *rsa;
813         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
814         unsigned int u;
815 #endif
816 #ifndef OPENSSL_NO_DH
817         DH *dh=NULL,*dhp;
818 #endif
819 #ifndef OPENSSL_NO_ECDH
820         EC_KEY *ecdh=NULL, *ecdhp;
821         unsigned char *encodedPoint = NULL;
822         int encodedlen = 0;
823         int curve_id = 0;
824         BN_CTX *bn_ctx = NULL; 
825 #endif
826         EVP_PKEY *pkey;
827         unsigned char *p,*d;
828         int al,i;
829         unsigned long type;
830         int n;
831         CERT *cert;
832         BIGNUM *r[4];
833         int nr[4],kn;
834         BUF_MEM *buf;
835         EVP_MD_CTX md_ctx;
836
837         EVP_MD_CTX_init(&md_ctx);
838         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
839                 {
840                 type=s->s3->tmp.new_cipher->algorithm_mkey;
841                 cert=s->cert;
842
843                 buf=s->init_buf;
844
845                 r[0]=r[1]=r[2]=r[3]=NULL;
846                 n=0;
847 #ifndef OPENSSL_NO_RSA
848                 if (type & SSL_kRSA)
849                         {
850                         rsa=cert->rsa_tmp;
851                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
852                                 {
853                                 rsa=s->cert->rsa_tmp_cb(s,
854                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
855                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
856                                 if(rsa == NULL)
857                                 {
858                                         al=SSL_AD_HANDSHAKE_FAILURE;
859                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
860                                         goto f_err;
861                                 }
862                                 RSA_up_ref(rsa);
863                                 cert->rsa_tmp=rsa;
864                                 }
865                         if (rsa == NULL)
866                                 {
867                                 al=SSL_AD_HANDSHAKE_FAILURE;
868                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
869                                 goto f_err;
870                                 }
871                         r[0]=rsa->n;
872                         r[1]=rsa->e;
873                         s->s3->tmp.use_rsa_tmp=1;
874                         }
875                 else
876 #endif
877 #ifndef OPENSSL_NO_DH
878                         if (type & SSL_kEDH)
879                         {
880                         dhp=cert->dh_tmp;
881                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
882                                 dhp=s->cert->dh_tmp_cb(s,
883                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
884                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
885                         if (dhp == NULL)
886                                 {
887                                 al=SSL_AD_HANDSHAKE_FAILURE;
888                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
889                                 goto f_err;
890                                 }
891
892                         if (s->s3->tmp.dh != NULL)
893                                 {
894                                 DH_free(dh);
895                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
896                                 goto err;
897                                 }
898
899                         if ((dh=DHparams_dup(dhp)) == NULL)
900                                 {
901                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
902                                 goto err;
903                                 }
904
905                         s->s3->tmp.dh=dh;
906                         if ((dhp->pub_key == NULL ||
907                              dhp->priv_key == NULL ||
908                              (s->options & SSL_OP_SINGLE_DH_USE)))
909                                 {
910                                 if(!DH_generate_key(dh))
911                                     {
912                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
913                                            ERR_R_DH_LIB);
914                                     goto err;
915                                     }
916                                 }
917                         else
918                                 {
919                                 dh->pub_key=BN_dup(dhp->pub_key);
920                                 dh->priv_key=BN_dup(dhp->priv_key);
921                                 if ((dh->pub_key == NULL) ||
922                                         (dh->priv_key == NULL))
923                                         {
924                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
925                                         goto err;
926                                         }
927                                 }
928                         r[0]=dh->p;
929                         r[1]=dh->g;
930                         r[2]=dh->pub_key;
931                         }
932                 else 
933 #endif
934 #ifndef OPENSSL_NO_ECDH
935                         if (type & SSL_kEECDH)
936                         {
937                         const EC_GROUP *group;
938
939                         ecdhp=cert->ecdh_tmp;
940                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
941                                 {
942                                 ecdhp=s->cert->ecdh_tmp_cb(s,
943                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
944                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
945                                 }
946                         if (ecdhp == NULL)
947                                 {
948                                 al=SSL_AD_HANDSHAKE_FAILURE;
949                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
950                                 goto f_err;
951                                 }
952
953                         if (s->s3->tmp.ecdh != NULL)
954                                 {
955                                 EC_KEY_free(s->s3->tmp.ecdh); 
956                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
957                                 goto err;
958                                 }
959
960                         /* Duplicate the ECDH structure. */
961                         if (ecdhp == NULL)
962                                 {
963                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
964                                 goto err;
965                                 }
966                         if (!EC_KEY_up_ref(ecdhp))
967                                 {
968                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
969                                 goto err;
970                                 }
971                         ecdh = ecdhp;
972
973                         s->s3->tmp.ecdh=ecdh;
974                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
975                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
976                             (s->options & SSL_OP_SINGLE_ECDH_USE))
977                                 {
978                                 if(!EC_KEY_generate_key(ecdh))
979                                     {
980                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
981                                     goto err;
982                                     }
983                                 }
984
985                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
986                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
987                             (EC_KEY_get0_private_key(ecdh) == NULL))
988                                 {
989                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
990                                 goto err;
991                                 }
992
993                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
994                             (EC_GROUP_get_degree(group) > 163)) 
995                                 {
996                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
997                                 goto err;
998                                 }
999
1000                         /* XXX: For now, we only support ephemeral ECDH
1001                          * keys over named (not generic) curves. For 
1002                          * supported named curves, curve_id is non-zero.
1003                          */
1004                         if ((curve_id = 
1005                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1006                             == 0)
1007                                 {
1008                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1009                                 goto err;
1010                                 }
1011
1012                         /* Encode the public key.
1013                          * First check the size of encoding and
1014                          * allocate memory accordingly.
1015                          */
1016                         encodedlen = EC_POINT_point2oct(group, 
1017                             EC_KEY_get0_public_key(ecdh),
1018                             POINT_CONVERSION_UNCOMPRESSED, 
1019                             NULL, 0, NULL);
1020
1021                         encodedPoint = (unsigned char *) 
1022                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1023                         bn_ctx = BN_CTX_new();
1024                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1025                                 {
1026                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1027                                 goto err;
1028                                 }
1029
1030
1031                         encodedlen = EC_POINT_point2oct(group, 
1032                             EC_KEY_get0_public_key(ecdh), 
1033                             POINT_CONVERSION_UNCOMPRESSED, 
1034                             encodedPoint, encodedlen, bn_ctx);
1035
1036                         if (encodedlen == 0) 
1037                                 {
1038                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1039                                 goto err;
1040                                 }
1041
1042                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1043
1044                         /* XXX: For now, we only support named (not 
1045                          * generic) curves in ECDH ephemeral key exchanges.
1046                          * In this situation, we need four additional bytes
1047                          * to encode the entire ServerECDHParams
1048                          * structure. 
1049                          */
1050                         n = 4 + encodedlen;
1051
1052                         /* We'll generate the serverKeyExchange message
1053                          * explicitly so we can set these to NULLs
1054                          */
1055                         r[0]=NULL;
1056                         r[1]=NULL;
1057                         r[2]=NULL;
1058                         r[3]=NULL;
1059                         }
1060                 else 
1061 #endif /* !OPENSSL_NO_ECDH */
1062 #ifndef OPENSSL_NO_PSK
1063                         if (type & SSL_kPSK)
1064                                 {
1065                                 /* reserve size for record length and PSK identity hint*/
1066                                 n+=2+strlen(s->ctx->psk_identity_hint);
1067                                 }
1068                         else
1069 #endif /* !OPENSSL_NO_PSK */
1070                         {
1071                         al=SSL_AD_HANDSHAKE_FAILURE;
1072                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1073                         goto f_err;
1074                         }
1075                 for (i=0; r[i] != NULL; i++)
1076                         {
1077                         nr[i]=BN_num_bytes(r[i]);
1078                         n+=2+nr[i];
1079                         }
1080
1081                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1082                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1083                         {
1084                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1085                                 == NULL)
1086                                 {
1087                                 al=SSL_AD_DECODE_ERROR;
1088                                 goto f_err;
1089                                 }
1090                         kn=EVP_PKEY_size(pkey);
1091                         }
1092                 else
1093                         {
1094                         pkey=NULL;
1095                         kn=0;
1096                         }
1097
1098                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1099                         {
1100                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1101                         goto err;
1102                         }
1103                 d=(unsigned char *)s->init_buf->data;
1104                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1105
1106                 for (i=0; r[i] != NULL; i++)
1107                         {
1108                         s2n(nr[i],p);
1109                         BN_bn2bin(r[i],p);
1110                         p+=nr[i];
1111                         }
1112
1113 #ifndef OPENSSL_NO_ECDH
1114                 if (type & SSL_kEECDH) 
1115                         {
1116                         /* XXX: For now, we only support named (not generic) curves.
1117                          * In this situation, the serverKeyExchange message has:
1118                          * [1 byte CurveType], [2 byte CurveName]
1119                          * [1 byte length of encoded point], followed by
1120                          * the actual encoded point itself
1121                          */
1122                         *p = NAMED_CURVE_TYPE;
1123                         p += 1;
1124                         *p = 0;
1125                         p += 1;
1126                         *p = curve_id;
1127                         p += 1;
1128                         *p = encodedlen;
1129                         p += 1;
1130                         memcpy((unsigned char*)p, 
1131                             (unsigned char *)encodedPoint, 
1132                             encodedlen);
1133                         OPENSSL_free(encodedPoint);
1134                         p += encodedlen;
1135                         }
1136 #endif
1137
1138 #ifndef OPENSSL_NO_PSK
1139                 if (type & SSL_kPSK)
1140                         {
1141                         /* copy PSK identity hint */
1142                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1143                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1144                         p+=strlen(s->ctx->psk_identity_hint);
1145                         }
1146 #endif
1147
1148                 /* not anonymous */
1149                 if (pkey != NULL)
1150                         {
1151                         /* n is the length of the params, they start at
1152                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1153                          * at the end. */
1154 #ifndef OPENSSL_NO_RSA
1155                         if (pkey->type == EVP_PKEY_RSA)
1156                                 {
1157                                 q=md_buf;
1158                                 j=0;
1159                                 for (num=2; num > 0; num--)
1160                                         {
1161                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1162                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1163                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1164                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1165                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1166                                         EVP_DigestFinal_ex(&md_ctx,q,
1167                                                 (unsigned int *)&i);
1168                                         q+=i;
1169                                         j+=i;
1170                                         }
1171                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1172                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1173                                         {
1174                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1175                                         goto err;
1176                                         }
1177                                 s2n(u,p);
1178                                 n+=u+2;
1179                                 }
1180                         else
1181 #endif
1182 #if !defined(OPENSSL_NO_DSA)
1183                                 if (pkey->type == EVP_PKEY_DSA)
1184                                 {
1185                                 /* lets do DSS */
1186                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1187                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1188                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1189                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1190                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1191                                         (unsigned int *)&i,pkey))
1192                                         {
1193                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1194                                         goto err;
1195                                         }
1196                                 s2n(i,p);
1197                                 n+=i+2;
1198                                 }
1199                         else
1200 #endif
1201 #if !defined(OPENSSL_NO_ECDSA)
1202                                 if (pkey->type == EVP_PKEY_EC)
1203                                 {
1204                                 /* let's do ECDSA */
1205                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1206                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1207                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1208                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1209                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1210                                         (unsigned int *)&i,pkey))
1211                                         {
1212                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1213                                         goto err;
1214                                         }
1215                                 s2n(i,p);
1216                                 n+=i+2;
1217                                 }
1218                         else
1219 #endif
1220                                 {
1221                                 /* Is this error check actually needed? */
1222                                 al=SSL_AD_HANDSHAKE_FAILURE;
1223                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1224                                 goto f_err;
1225                                 }
1226                         }
1227
1228                 d = dtls1_set_message_header(s, d,
1229                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1230
1231                 /* we should now have things packed up, so lets send
1232                  * it off */
1233                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1234                 s->init_off=0;
1235
1236                 /* buffer the message to handle re-xmits */
1237                 dtls1_buffer_message(s, 0);
1238                 }
1239
1240         s->state = SSL3_ST_SW_KEY_EXCH_B;
1241         EVP_MD_CTX_cleanup(&md_ctx);
1242         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1243 f_err:
1244         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1245 err:
1246 #ifndef OPENSSL_NO_ECDH
1247         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1248         BN_CTX_free(bn_ctx);
1249 #endif
1250         EVP_MD_CTX_cleanup(&md_ctx);
1251         return(-1);
1252         }
1253
1254 int dtls1_send_certificate_request(SSL *s)
1255         {
1256         unsigned char *p,*d;
1257         int i,j,nl,off,n;
1258         STACK_OF(X509_NAME) *sk=NULL;
1259         X509_NAME *name;
1260         BUF_MEM *buf;
1261         unsigned int msg_len;
1262
1263         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1264                 {
1265                 buf=s->init_buf;
1266
1267                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1268
1269                 /* get the list of acceptable cert types */
1270                 p++;
1271                 n=ssl3_get_req_cert_type(s,p);
1272                 d[0]=n;
1273                 p+=n;
1274                 n++;
1275
1276                 off=n;
1277                 p+=2;
1278                 n+=2;
1279
1280                 sk=SSL_get_client_CA_list(s);
1281                 nl=0;
1282                 if (sk != NULL)
1283                         {
1284                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1285                                 {
1286                                 name=sk_X509_NAME_value(sk,i);
1287                                 j=i2d_X509_NAME(name,NULL);
1288                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1289                                         {
1290                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1291                                         goto err;
1292                                         }
1293                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1294                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1295                                         {
1296                                         s2n(j,p);
1297                                         i2d_X509_NAME(name,&p);
1298                                         n+=2+j;
1299                                         nl+=2+j;
1300                                         }
1301                                 else
1302                                         {
1303                                         d=p;
1304                                         i2d_X509_NAME(name,&p);
1305                                         j-=2; s2n(j,d); j+=2;
1306                                         n+=j;
1307                                         nl+=j;
1308                                         }
1309                                 }
1310                         }
1311                 /* else no CA names */
1312                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1313                 s2n(nl,p);
1314
1315                 d=(unsigned char *)buf->data;
1316                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1317                 l2n3(n,d);
1318                 s2n(s->d1->handshake_write_seq,d);
1319                 s->d1->handshake_write_seq++;
1320
1321                 /* we should now have things packed up, so lets send
1322                  * it off */
1323
1324                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1325                 s->init_off=0;
1326 #ifdef NETSCAPE_HANG_BUG
1327 /* XXX: what to do about this? */
1328                 p=(unsigned char *)s->init_buf->data + s->init_num;
1329
1330                 /* do the header */
1331                 *(p++)=SSL3_MT_SERVER_DONE;
1332                 *(p++)=0;
1333                 *(p++)=0;
1334                 *(p++)=0;
1335                 s->init_num += 4;
1336 #endif
1337
1338                 /* XDTLS:  set message header ? */
1339                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1340                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1341                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1342
1343                 /* buffer the message to handle re-xmits */
1344                 dtls1_buffer_message(s, 0);
1345
1346                 s->state = SSL3_ST_SW_CERT_REQ_B;
1347                 }
1348
1349         /* SSL3_ST_SW_CERT_REQ_B */
1350         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1351 err:
1352         return(-1);
1353         }
1354
1355 int dtls1_send_server_certificate(SSL *s)
1356         {
1357         unsigned long l;
1358         X509 *x;
1359
1360         if (s->state == SSL3_ST_SW_CERT_A)
1361                 {
1362                 x=ssl_get_server_send_cert(s);
1363                 if (x == NULL)
1364                         {
1365                         /* VRS: allow null cert if auth == KRB5 */
1366                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1367                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1368                                 {
1369                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1370                                 return(0);
1371                                 }
1372                         }
1373
1374                 l=dtls1_output_cert_chain(s,x);
1375                 s->state=SSL3_ST_SW_CERT_B;
1376                 s->init_num=(int)l;
1377                 s->init_off=0;
1378
1379                 /* buffer the message to handle re-xmits */
1380                 dtls1_buffer_message(s, 0);
1381                 }
1382
1383         /* SSL3_ST_SW_CERT_B */
1384         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1385         }