e0d9388c38b7cfe63c7290b242d51b59d4542ed2
[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         unsigned long alg_k;
151         int ret= -1;
152         int new_state,state,skip=0;
153         int listen;
154 #ifndef OPENSSL_NO_SCTP
155         unsigned char sctpauthkey[64];
156         char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
157 #endif
158
159         RAND_add(&Time,sizeof(Time),0);
160         ERR_clear_error();
161         clear_sys_error();
162
163         if (s->info_callback != NULL)
164                 cb=s->info_callback;
165         else if (s->ctx->info_callback != NULL)
166                 cb=s->ctx->info_callback;
167         
168         listen = s->d1->listen;
169
170         /* init things to blank */
171         s->in_handshake++;
172         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
173
174         s->d1->listen = listen;
175 #ifndef OPENSSL_NO_SCTP
176         /* Notify SCTP BIO socket to enter handshake
177          * mode and prevent stream identifier other
178          * than 0. Will be ignored if no SCTP is used.
179          */
180         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
181 #endif
182
183         if (s->cert == NULL)
184                 {
185                 SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
186                 return(-1);
187                 }
188
189 #ifndef OPENSSL_NO_HEARTBEATS
190         /* If we're awaiting a HeartbeatResponse, pretend we
191          * already got and don't await it anymore, because
192          * Heartbeats don't make sense during handshakes anyway.
193          */
194         if (s->tlsext_hb_pending)
195                 {
196                 dtls1_stop_timer(s);
197                 s->tlsext_hb_pending = 0;
198                 s->tlsext_hb_seq++;
199                 }
200 #endif
201
202         for (;;)
203                 {
204                 state=s->state;
205
206                 switch (s->state)
207                         {
208                 case SSL_ST_RENEGOTIATE:
209                         s->renegotiate=1;
210                         /* s->state=SSL_ST_ACCEPT; */
211
212                 case SSL_ST_BEFORE:
213                 case SSL_ST_ACCEPT:
214                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
215                 case SSL_ST_OK|SSL_ST_ACCEPT:
216
217                         s->server=1;
218                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
219
220                         if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00))
221                                 {
222                                 SSLerr(SSL_F_DTLS1_ACCEPT, ERR_R_INTERNAL_ERROR);
223                                 return -1;
224                                 }
225                         s->type=SSL_ST_ACCEPT;
226
227                         if (s->init_buf == NULL)
228                                 {
229                                 if ((buf=BUF_MEM_new()) == NULL)
230                                         {
231                                         ret= -1;
232                                         goto end;
233                                         }
234                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
235                                         {
236                                         ret= -1;
237                                         goto end;
238                                         }
239                                 s->init_buf=buf;
240                                 }
241
242                         if (!ssl3_setup_buffers(s))
243                                 {
244                                 ret= -1;
245                                 goto end;
246                                 }
247
248                         s->init_num=0;
249
250                         if (s->state != SSL_ST_RENEGOTIATE)
251                                 {
252                                 /* Ok, we now need to push on a buffering BIO so that
253                                  * the output is sent in a way that TCP likes :-)
254                                  * ...but not with SCTP :-)
255                                  */
256 #ifndef OPENSSL_NO_SCTP
257                                 if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
258 #endif
259                                         if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
260
261                                 ssl3_init_finished_mac(s);
262                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
263                                 s->ctx->stats.sess_accept++;
264                                 }
265                         else
266                                 {
267                                 /* s->state == SSL_ST_RENEGOTIATE,
268                                  * we will just send a HelloRequest */
269                                 s->ctx->stats.sess_accept_renegotiate++;
270                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
271                                 }
272
273                         break;
274
275                 case SSL3_ST_SW_HELLO_REQ_A:
276                 case SSL3_ST_SW_HELLO_REQ_B:
277
278                         s->shutdown=0;
279                         dtls1_start_timer(s);
280                         ret=dtls1_send_hello_request(s);
281                         if (ret <= 0) goto end;
282                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
283                         s->state=SSL3_ST_SW_FLUSH;
284                         s->init_num=0;
285
286                         ssl3_init_finished_mac(s);
287                         break;
288
289                 case SSL3_ST_SW_HELLO_REQ_C:
290                         s->state=SSL_ST_OK;
291                         break;
292
293                 case SSL3_ST_SR_CLNT_HELLO_A:
294                 case SSL3_ST_SR_CLNT_HELLO_B:
295                 case SSL3_ST_SR_CLNT_HELLO_C:
296
297                         s->shutdown=0;
298                         ret=ssl3_get_client_hello(s);
299                         if (ret <= 0) goto end;
300                         dtls1_stop_timer(s);
301
302                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
303                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
304                         else
305                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
306
307                         s->init_num=0;
308
309                         /* Reflect ClientHello sequence to remain stateless while listening */
310                         if (listen)
311                                 {
312                                 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
313                                 }
314
315                         /* If we're just listening, stop here */
316                         if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
317                                 {
318                                 ret = 2;
319                                 s->d1->listen = 0;
320                                 /* Set expected sequence numbers
321                                  * to continue the handshake.
322                                  */
323                                 s->d1->handshake_read_seq = 2;
324                                 s->d1->handshake_write_seq = 1;
325                                 s->d1->next_handshake_write_seq = 1;
326                                 goto end;
327                                 }
328                         
329                         break;
330                         
331                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
332                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
333
334                         ret = dtls1_send_hello_verify_request(s);
335                         if ( ret <= 0) goto end;
336                         s->state=SSL3_ST_SW_FLUSH;
337                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
338
339                         /* HelloVerifyRequest resets Finished MAC */
340                         if (s->version != DTLS1_BAD_VER)
341                                 ssl3_init_finished_mac(s);
342                         break;
343                         
344 #ifndef OPENSSL_NO_SCTP
345                 case DTLS1_SCTP_ST_SR_READ_SOCK:
346                         
347                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))                
348                                 {
349                                 s->s3->in_read_app_data=2;
350                                 s->rwstate=SSL_READING;
351                                 BIO_clear_retry_flags(SSL_get_rbio(s));
352                                 BIO_set_retry_read(SSL_get_rbio(s));
353                                 ret = -1;
354                                 goto end;
355                                 }
356                         
357                         s->state=SSL3_ST_SR_FINISHED_A;
358                         break;
359                         
360                 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
361                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
362                         if (ret < 0) goto end;
363                         
364                         if (ret == 0)
365                                 {
366                                 if (s->d1->next_state != SSL_ST_OK)
367                                         {
368                                         s->s3->in_read_app_data=2;
369                                         s->rwstate=SSL_READING;
370                                         BIO_clear_retry_flags(SSL_get_rbio(s));
371                                         BIO_set_retry_read(SSL_get_rbio(s));
372                                         ret = -1;
373                                         goto end;
374                                         }
375                                 }
376
377                         s->state=s->d1->next_state;
378                         break;
379 #endif
380
381                 case SSL3_ST_SW_SRVR_HELLO_A:
382                 case SSL3_ST_SW_SRVR_HELLO_B:
383                         s->renegotiate = 2;
384                         dtls1_start_timer(s);
385                         ret=dtls1_send_server_hello(s);
386                         if (ret <= 0) goto end;
387
388                         if (s->hit)
389                                 {
390 #ifndef OPENSSL_NO_SCTP
391                                 /* Add new shared key for SCTP-Auth,
392                                  * will be ignored if no SCTP used.
393                                  */
394                                 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
395                                          DTLS1_SCTP_AUTH_LABEL);
396
397                                 SSL_export_keying_material(s, sctpauthkey,
398                                                            sizeof(sctpauthkey), labelbuffer,
399                                                            sizeof(labelbuffer), NULL, 0, 0);
400                                 
401                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
402                          sizeof(sctpauthkey), sctpauthkey);
403 #endif
404 #ifndef OPENSSL_NO_TLSEXT
405                                 if (s->tlsext_ticket_expected)
406                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
407                                 else
408                                         s->state=SSL3_ST_SW_CHANGE_A;
409 #else
410                                 s->state=SSL3_ST_SW_CHANGE_A;
411 #endif
412                                 }
413                         else
414                                 s->state=SSL3_ST_SW_CERT_A;
415                         s->init_num=0;
416                         break;
417
418                 case SSL3_ST_SW_CERT_A:
419                 case SSL3_ST_SW_CERT_B:
420                         /* Check if it is anon DH or normal PSK */
421                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
422                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
423                                 {
424                                 dtls1_start_timer(s);
425                                 ret=dtls1_send_server_certificate(s);
426                                 if (ret <= 0) goto end;
427 #ifndef OPENSSL_NO_TLSEXT
428                                 if (s->tlsext_status_expected)
429                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
430                                 else
431                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
432                                 }
433                         else
434                                 {
435                                 skip = 1;
436                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
437                                 }
438 #else
439                                 }
440                         else
441                                 skip=1;
442
443                         s->state=SSL3_ST_SW_KEY_EXCH_A;
444 #endif
445                         s->init_num=0;
446                         break;
447
448                 case SSL3_ST_SW_KEY_EXCH_A:
449                 case SSL3_ST_SW_KEY_EXCH_B:
450                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
451
452                         /* clear this, it may get reset by
453                          * send_server_key_exchange */
454                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
455 #ifndef OPENSSL_NO_KRB5
456                                 && !(alg_k & SSL_kKRB5)
457 #endif /* OPENSSL_NO_KRB5 */
458                                 )
459                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
460                                  * even when forbidden by protocol specs
461                                  * (handshake may fail as clients are not required to
462                                  * be able to handle this) */
463                                 s->s3->tmp.use_rsa_tmp=1;
464                         else
465                                 s->s3->tmp.use_rsa_tmp=0;
466
467                         /* only send if a DH key exchange or
468                          * RSA but we have a sign only certificate */
469                         if (s->s3->tmp.use_rsa_tmp
470                         /* PSK: send ServerKeyExchange if PSK identity
471                          * hint if provided */
472 #ifndef OPENSSL_NO_PSK
473                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
474 #endif
475                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
476                             || (alg_k & SSL_kEECDH)
477                             || ((alg_k & SSL_kRSA)
478                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
479                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
480                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
481                                         )
482                                     )
483                                 )
484                             )
485                                 {
486                                 dtls1_start_timer(s);
487                                 ret=dtls1_send_server_key_exchange(s);
488                                 if (ret <= 0) goto end;
489                                 }
490                         else
491                                 skip=1;
492
493                         s->state=SSL3_ST_SW_CERT_REQ_A;
494                         s->init_num=0;
495                         break;
496
497                 case SSL3_ST_SW_CERT_REQ_A:
498                 case SSL3_ST_SW_CERT_REQ_B:
499                         if (/* don't request cert unless asked for it: */
500                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
501                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
502                                  * don't request cert during re-negotiation: */
503                                 ((s->session->peer != NULL) &&
504                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
505                                 /* never request cert in anonymous ciphersuites
506                                  * (see section "Certificate request" in SSL 3 drafts
507                                  * and in RFC 2246): */
508                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
509                                  /* ... except when the application insists on verification
510                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
511                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
512                                  /* never request cert in Kerberos ciphersuites */
513                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
514                                 /* With normal PSK Certificates and
515                                  * Certificate Requests are omitted */
516                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
517                                 {
518                                 /* no cert request */
519                                 skip=1;
520                                 s->s3->tmp.cert_request=0;
521                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
522 #ifndef OPENSSL_NO_SCTP
523                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
524                                         {
525                                         s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
526                                         s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
527                                         }
528 #endif
529                                 }
530                         else
531                                 {
532                                 s->s3->tmp.cert_request=1;
533                                 dtls1_start_timer(s);
534                                 ret=dtls1_send_certificate_request(s);
535                                 if (ret <= 0) goto end;
536 #ifndef NETSCAPE_HANG_BUG
537                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
538 #ifndef OPENSSL_NO_SCTP
539                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
540                                         {
541                                         s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
542                                         s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
543                                         }
544 #endif
545 #else
546                                 s->state=SSL3_ST_SW_FLUSH;
547                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
548 #ifndef OPENSSL_NO_SCTP
549                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
550                                         {
551                                         s->d1->next_state = s->s3->tmp.next_state;
552                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
553                                         }
554 #endif
555 #endif
556                                 s->init_num=0;
557                                 }
558                         break;
559
560                 case SSL3_ST_SW_SRVR_DONE_A:
561                 case SSL3_ST_SW_SRVR_DONE_B:
562                         dtls1_start_timer(s);
563                         ret=dtls1_send_server_done(s);
564                         if (ret <= 0) goto end;
565                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
566                         s->state=SSL3_ST_SW_FLUSH;
567                         s->init_num=0;
568                         break;
569                 
570                 case SSL3_ST_SW_FLUSH:
571                         s->rwstate=SSL_WRITING;
572                         if (BIO_flush(s->wbio) <= 0)
573                                 {
574                                 /* If the write error was fatal, stop trying */
575                                 if (!BIO_should_retry(s->wbio))
576                                         {
577                                         s->rwstate=SSL_NOTHING;
578                                         s->state=s->s3->tmp.next_state;
579                                         }
580                                 
581                                 ret= -1;
582                                 goto end;
583                                 }
584                         s->rwstate=SSL_NOTHING;
585                         s->state=s->s3->tmp.next_state;
586                         break;
587
588                 case SSL3_ST_SR_CERT_A:
589                 case SSL3_ST_SR_CERT_B:
590                         /* Check for second client hello (MS SGC) */
591                         ret = ssl3_check_client_hello(s);
592                         if (ret <= 0)
593                                 goto end;
594                         if (ret == 2)
595                                 {
596                                 dtls1_stop_timer(s);
597                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
598                                 }
599                         else {
600                                 /* could be sent for a DH cert, even if we
601                                  * have not asked for it :-) */
602                                 ret=ssl3_get_client_certificate(s);
603                                 if (ret <= 0) goto end;
604                                 s->init_num=0;
605                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
606                         }
607                         break;
608
609                 case SSL3_ST_SR_KEY_EXCH_A:
610                 case SSL3_ST_SR_KEY_EXCH_B:
611                         ret=ssl3_get_client_key_exchange(s);
612                         if (ret <= 0) goto end;
613 #ifndef OPENSSL_NO_SCTP
614                         /* Add new shared key for SCTP-Auth,
615                          * will be ignored if no SCTP used.
616                          */
617                         snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
618                                  DTLS1_SCTP_AUTH_LABEL);
619
620                         SSL_export_keying_material(s, sctpauthkey,
621                                                    sizeof(sctpauthkey), labelbuffer,
622                                                    sizeof(labelbuffer), NULL, 0, 0);
623
624                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
625                                  sizeof(sctpauthkey), sctpauthkey);
626 #endif
627
628                         s->state=SSL3_ST_SR_CERT_VRFY_A;
629                         s->init_num=0;
630
631                         if (ret == 2)
632                                 {
633                                 /* For the ECDH ciphersuites when
634                                  * the client sends its ECDH pub key in
635                                  * a certificate, the CertificateVerify
636                                  * message is not sent.
637                                  */
638                                 s->state=SSL3_ST_SR_FINISHED_A;
639                                 s->init_num = 0;
640                                 }
641                         else
642                                 {
643                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
644                                 s->init_num=0;
645
646                                 /* We need to get hashes here so if there is
647                                  * a client cert, it can be verified */ 
648                                 s->method->ssl3_enc->cert_verify_mac(s,
649                                         NID_md5,
650                                         &(s->s3->tmp.cert_verify_md[0]));
651                                 s->method->ssl3_enc->cert_verify_mac(s,
652                                         NID_sha1,
653                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
654                                 }
655                         break;
656
657                 case SSL3_ST_SR_CERT_VRFY_A:
658                 case SSL3_ST_SR_CERT_VRFY_B:
659
660                         s->d1->change_cipher_spec_ok = 1;
661                         /* we should decide if we expected this one */
662                         ret=ssl3_get_cert_verify(s);
663                         if (ret <= 0) goto end;
664 #ifndef OPENSSL_NO_SCTP
665                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
666                             state == SSL_ST_RENEGOTIATE)
667                                 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
668                         else
669 #endif                  
670                                 s->state=SSL3_ST_SR_FINISHED_A;
671                         s->init_num=0;
672                         break;
673
674                 case SSL3_ST_SR_FINISHED_A:
675                 case SSL3_ST_SR_FINISHED_B:
676                         s->d1->change_cipher_spec_ok = 1;
677                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
678                                 SSL3_ST_SR_FINISHED_B);
679                         if (ret <= 0) goto end;
680                         dtls1_stop_timer(s);
681                         if (s->hit)
682                                 s->state=SSL_ST_OK;
683 #ifndef OPENSSL_NO_TLSEXT
684                         else if (s->tlsext_ticket_expected)
685                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
686 #endif
687                         else
688                                 s->state=SSL3_ST_SW_CHANGE_A;
689                         s->init_num=0;
690                         break;
691
692 #ifndef OPENSSL_NO_TLSEXT
693                 case SSL3_ST_SW_SESSION_TICKET_A:
694                 case SSL3_ST_SW_SESSION_TICKET_B:
695                         ret=dtls1_send_newsession_ticket(s);
696                         if (ret <= 0) goto end;
697                         s->state=SSL3_ST_SW_CHANGE_A;
698                         s->init_num=0;
699                         break;
700
701                 case SSL3_ST_SW_CERT_STATUS_A:
702                 case SSL3_ST_SW_CERT_STATUS_B:
703                         ret=ssl3_send_cert_status(s);
704                         if (ret <= 0) goto end;
705                         s->state=SSL3_ST_SW_KEY_EXCH_A;
706                         s->init_num=0;
707                         break;
708
709 #endif
710
711                 case SSL3_ST_SW_CHANGE_A:
712                 case SSL3_ST_SW_CHANGE_B:
713
714                         s->session->cipher=s->s3->tmp.new_cipher;
715                         if (!s->method->ssl3_enc->setup_key_block(s))
716                                 { ret= -1; goto end; }
717
718                         ret=dtls1_send_change_cipher_spec(s,
719                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
720
721                         if (ret <= 0) goto end;
722
723 #ifndef OPENSSL_NO_SCTP
724                         /* Change to new shared key of SCTP-Auth,
725                          * will be ignored if no SCTP used.
726                          */
727                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
728 #endif
729
730                         s->state=SSL3_ST_SW_FINISHED_A;
731                         s->init_num=0;
732
733                         if (!s->method->ssl3_enc->change_cipher_state(s,
734                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
735                                 {
736                                 ret= -1;
737                                 goto end;
738                                 }
739
740                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
741                         break;
742
743                 case SSL3_ST_SW_FINISHED_A:
744                 case SSL3_ST_SW_FINISHED_B:
745                         ret=dtls1_send_finished(s,
746                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
747                                 s->method->ssl3_enc->server_finished_label,
748                                 s->method->ssl3_enc->server_finished_label_len);
749                         if (ret <= 0) goto end;
750                         s->state=SSL3_ST_SW_FLUSH;
751                         if (s->hit)
752                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
753                         else
754                                 {
755                                 s->s3->tmp.next_state=SSL_ST_OK;
756 #ifndef OPENSSL_NO_SCTP
757                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
758                                         {
759                                         s->d1->next_state = s->s3->tmp.next_state;
760                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
761                                         }
762 #endif
763                                 }
764                         s->init_num=0;
765                         break;
766
767                 case SSL_ST_OK:
768                         /* clean a few things up */
769                         ssl3_cleanup_key_block(s);
770
771 #if 0
772                         BUF_MEM_free(s->init_buf);
773                         s->init_buf=NULL;
774 #endif
775
776                         /* remove buffering on output */
777                         ssl_free_wbio_buffer(s);
778
779                         s->init_num=0;
780
781                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
782                                 {
783                                 s->renegotiate=0;
784                                 s->new_session=0;
785                                 
786                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
787                                 
788                                 s->ctx->stats.sess_accept_good++;
789                                 /* s->server=1; */
790                                 s->handshake_func=dtls1_accept;
791
792                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
793                                 }
794                         
795                         ret = 1;
796
797                         /* done handshaking, next message is client hello */
798                         s->d1->handshake_read_seq = 0;
799                         /* next message is server hello */
800                         s->d1->handshake_write_seq = 0;
801                         s->d1->next_handshake_write_seq = 0;
802                         goto end;
803                         /* break; */
804
805                 default:
806                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
807                         ret= -1;
808                         goto end;
809                         /* break; */
810                         }
811                 
812                 if (!s->s3->tmp.reuse_message && !skip)
813                         {
814                         if (s->debug)
815                                 {
816                                 if ((ret=BIO_flush(s->wbio)) <= 0)
817                                         goto end;
818                                 }
819
820
821                         if ((cb != NULL) && (s->state != state))
822                                 {
823                                 new_state=s->state;
824                                 s->state=state;
825                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
826                                 s->state=new_state;
827                                 }
828                         }
829                 skip=0;
830                 }
831 end:
832         /* BIO_flush(s->wbio); */
833
834         s->in_handshake--;
835 #ifndef OPENSSL_NO_SCTP
836                 /* Notify SCTP BIO socket to leave handshake
837                  * mode and prevent stream identifier other
838                  * than 0. Will be ignored if no SCTP is used.
839                  */
840                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
841 #endif
842
843         if (cb != NULL)
844                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
845         return(ret);
846         }
847
848 int dtls1_send_hello_request(SSL *s)
849         {
850         unsigned char *p;
851
852         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
853                 {
854                 p=(unsigned char *)s->init_buf->data;
855                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
856
857                 s->state=SSL3_ST_SW_HELLO_REQ_B;
858                 /* number of bytes to write */
859                 s->init_num=DTLS1_HM_HEADER_LENGTH;
860                 s->init_off=0;
861
862                 /* no need to buffer this message, since there are no retransmit 
863                  * requests for it */
864                 }
865
866         /* SSL3_ST_SW_HELLO_REQ_B */
867         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
868         }
869
870 int dtls1_send_hello_verify_request(SSL *s)
871         {
872         unsigned int msg_len;
873         unsigned char *msg, *buf, *p;
874
875         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
876                 {
877                 buf = (unsigned char *)s->init_buf->data;
878
879                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
880                 *(p++) = s->version >> 8;
881                 *(p++) = s->version & 0xFF;
882
883                 if (s->ctx->app_gen_cookie_cb == NULL ||
884                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
885                          &(s->d1->cookie_len)) == 0)
886                         {
887                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
888                         return 0;
889                         }
890
891                 *(p++) = (unsigned char) s->d1->cookie_len;
892                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
893                 p += s->d1->cookie_len;
894                 msg_len = p - msg;
895
896                 dtls1_set_message_header(s, buf,
897                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
898
899                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
900                 /* number of bytes to write */
901                 s->init_num=p-buf;
902                 s->init_off=0;
903                 }
904
905         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
906         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
907         }
908
909 int dtls1_send_server_hello(SSL *s)
910         {
911         unsigned char *buf;
912         unsigned char *p,*d;
913         int i;
914         unsigned int sl;
915         unsigned long l,Time;
916
917         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
918                 {
919                 buf=(unsigned char *)s->init_buf->data;
920                 p=s->s3->server_random;
921                 Time=(unsigned long)time(NULL);                 /* Time */
922                 l2n(Time,p);
923                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
924                 /* Do the message type and length last */
925                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
926
927                 *(p++)=s->version>>8;
928                 *(p++)=s->version&0xff;
929
930                 /* Random stuff */
931                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
932                 p+=SSL3_RANDOM_SIZE;
933
934                 /* now in theory we have 3 options to sending back the
935                  * session id.  If it is a re-use, we send back the
936                  * old session-id, if it is a new session, we send
937                  * back the new session-id or we send back a 0 length
938                  * session-id if we want it to be single use.
939                  * Currently I will not implement the '0' length session-id
940                  * 12-Jan-98 - I'll now support the '0' length stuff.
941                  */
942                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
943                         s->session->session_id_length=0;
944
945                 sl=s->session->session_id_length;
946                 if (sl > sizeof s->session->session_id)
947                         {
948                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
949                         return -1;
950                         }
951                 *(p++)=sl;
952                 memcpy(p,s->session->session_id,sl);
953                 p+=sl;
954
955                 /* put the cipher */
956                 if (s->s3->tmp.new_cipher == NULL)
957                         return -1;
958                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
959                 p+=i;
960
961                 /* put the compression method */
962 #ifdef OPENSSL_NO_COMP
963                 *(p++)=0;
964 #else
965                 if (s->s3->tmp.new_compression == NULL)
966                         *(p++)=0;
967                 else
968                         *(p++)=s->s3->tmp.new_compression->id;
969 #endif
970
971 #ifndef OPENSSL_NO_TLSEXT
972                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
973                         {
974                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
975                         return -1;
976                         }
977 #endif
978
979                 /* do the header */
980                 l=(p-d);
981                 d=buf;
982
983                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
984
985                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
986                 /* number of bytes to write */
987                 s->init_num=p-buf;
988                 s->init_off=0;
989
990                 /* buffer the message to handle re-xmits */
991                 dtls1_buffer_message(s, 0);
992                 }
993
994         /* SSL3_ST_SW_SRVR_HELLO_B */
995         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
996         }
997
998 int dtls1_send_server_done(SSL *s)
999         {
1000         unsigned char *p;
1001
1002         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1003                 {
1004                 p=(unsigned char *)s->init_buf->data;
1005
1006                 /* do the header */
1007                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1008
1009                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1010                 /* number of bytes to write */
1011                 s->init_num=DTLS1_HM_HEADER_LENGTH;
1012                 s->init_off=0;
1013
1014                 /* buffer the message to handle re-xmits */
1015                 dtls1_buffer_message(s, 0);
1016                 }
1017
1018         /* SSL3_ST_SW_SRVR_DONE_B */
1019         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1020         }
1021
1022 int dtls1_send_server_key_exchange(SSL *s)
1023         {
1024 #ifndef OPENSSL_NO_RSA
1025         unsigned char *q;
1026         int j,num;
1027         RSA *rsa;
1028         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1029         unsigned int u;
1030 #endif
1031 #ifndef OPENSSL_NO_DH
1032         DH *dh=NULL,*dhp;
1033 #endif
1034 #ifndef OPENSSL_NO_ECDH
1035         EC_KEY *ecdh=NULL, *ecdhp;
1036         unsigned char *encodedPoint = NULL;
1037         int encodedlen = 0;
1038         int curve_id = 0;
1039         BN_CTX *bn_ctx = NULL; 
1040 #endif
1041         EVP_PKEY *pkey;
1042         unsigned char *p,*d;
1043         int al,i;
1044         unsigned long type;
1045         int n;
1046         CERT *cert;
1047         BIGNUM *r[4];
1048         int nr[4],kn;
1049         BUF_MEM *buf;
1050         EVP_MD_CTX md_ctx;
1051
1052         EVP_MD_CTX_init(&md_ctx);
1053         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1054                 {
1055                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1056                 cert=s->cert;
1057
1058                 buf=s->init_buf;
1059
1060                 r[0]=r[1]=r[2]=r[3]=NULL;
1061                 n=0;
1062 #ifndef OPENSSL_NO_RSA
1063                 if (type & SSL_kRSA)
1064                         {
1065                         rsa=cert->rsa_tmp;
1066                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1067                                 {
1068                                 rsa=s->cert->rsa_tmp_cb(s,
1069                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1070                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1071                                 if(rsa == NULL)
1072                                 {
1073                                         al=SSL_AD_HANDSHAKE_FAILURE;
1074                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1075                                         goto f_err;
1076                                 }
1077                                 RSA_up_ref(rsa);
1078                                 cert->rsa_tmp=rsa;
1079                                 }
1080                         if (rsa == NULL)
1081                                 {
1082                                 al=SSL_AD_HANDSHAKE_FAILURE;
1083                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1084                                 goto f_err;
1085                                 }
1086                         r[0]=rsa->n;
1087                         r[1]=rsa->e;
1088                         s->s3->tmp.use_rsa_tmp=1;
1089                         }
1090                 else
1091 #endif
1092 #ifndef OPENSSL_NO_DH
1093                         if (type & SSL_kEDH)
1094                         {
1095                         dhp=cert->dh_tmp;
1096                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1097                                 dhp=s->cert->dh_tmp_cb(s,
1098                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1099                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1100                         if (dhp == NULL)
1101                                 {
1102                                 al=SSL_AD_HANDSHAKE_FAILURE;
1103                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1104                                 goto f_err;
1105                                 }
1106
1107                         if (s->s3->tmp.dh != NULL)
1108                                 {
1109                                 DH_free(dh);
1110                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1111                                 goto err;
1112                                 }
1113
1114                         if ((dh=DHparams_dup(dhp)) == NULL)
1115                                 {
1116                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1117                                 goto err;
1118                                 }
1119
1120                         s->s3->tmp.dh=dh;
1121                         if ((dhp->pub_key == NULL ||
1122                              dhp->priv_key == NULL ||
1123                              (s->options & SSL_OP_SINGLE_DH_USE)))
1124                                 {
1125                                 if(!DH_generate_key(dh))
1126                                     {
1127                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1128                                            ERR_R_DH_LIB);
1129                                     goto err;
1130                                     }
1131                                 }
1132                         else
1133                                 {
1134                                 dh->pub_key=BN_dup(dhp->pub_key);
1135                                 dh->priv_key=BN_dup(dhp->priv_key);
1136                                 if ((dh->pub_key == NULL) ||
1137                                         (dh->priv_key == NULL))
1138                                         {
1139                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1140                                         goto err;
1141                                         }
1142                                 }
1143                         r[0]=dh->p;
1144                         r[1]=dh->g;
1145                         r[2]=dh->pub_key;
1146                         }
1147                 else 
1148 #endif
1149 #ifndef OPENSSL_NO_ECDH
1150                         if (type & SSL_kEECDH)
1151                         {
1152                         const EC_GROUP *group;
1153
1154                         ecdhp=cert->ecdh_tmp;
1155                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1156                                 {
1157                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1158                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1159                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1160                                 }
1161                         if (ecdhp == NULL)
1162                                 {
1163                                 al=SSL_AD_HANDSHAKE_FAILURE;
1164                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1165                                 goto f_err;
1166                                 }
1167
1168                         if (s->s3->tmp.ecdh != NULL)
1169                                 {
1170                                 EC_KEY_free(s->s3->tmp.ecdh); 
1171                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1172                                 goto err;
1173                                 }
1174
1175                         /* Duplicate the ECDH structure. */
1176                         if (ecdhp == NULL)
1177                                 {
1178                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1179                                 goto err;
1180                                 }
1181                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1182                                 {
1183                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1184                                 goto err;
1185                                 }
1186
1187                         s->s3->tmp.ecdh=ecdh;
1188                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1189                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1190                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1191                                 {
1192                                 if(!EC_KEY_generate_key(ecdh))
1193                                     {
1194                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1195                                     goto err;
1196                                     }
1197                                 }
1198
1199                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1200                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1201                             (EC_KEY_get0_private_key(ecdh) == NULL))
1202                                 {
1203                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1204                                 goto err;
1205                                 }
1206
1207                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1208                             (EC_GROUP_get_degree(group) > 163)) 
1209                                 {
1210                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1211                                 goto err;
1212                                 }
1213
1214                         /* XXX: For now, we only support ephemeral ECDH
1215                          * keys over named (not generic) curves. For 
1216                          * supported named curves, curve_id is non-zero.
1217                          */
1218                         if ((curve_id = 
1219                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1220                             == 0)
1221                                 {
1222                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1223                                 goto err;
1224                                 }
1225
1226                         /* Encode the public key.
1227                          * First check the size of encoding and
1228                          * allocate memory accordingly.
1229                          */
1230                         encodedlen = EC_POINT_point2oct(group, 
1231                             EC_KEY_get0_public_key(ecdh),
1232                             POINT_CONVERSION_UNCOMPRESSED, 
1233                             NULL, 0, NULL);
1234
1235                         encodedPoint = (unsigned char *) 
1236                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1237                         bn_ctx = BN_CTX_new();
1238                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1239                                 {
1240                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1241                                 goto err;
1242                                 }
1243
1244
1245                         encodedlen = EC_POINT_point2oct(group, 
1246                             EC_KEY_get0_public_key(ecdh), 
1247                             POINT_CONVERSION_UNCOMPRESSED, 
1248                             encodedPoint, encodedlen, bn_ctx);
1249
1250                         if (encodedlen == 0) 
1251                                 {
1252                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1253                                 goto err;
1254                                 }
1255
1256                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1257
1258                         /* XXX: For now, we only support named (not 
1259                          * generic) curves in ECDH ephemeral key exchanges.
1260                          * In this situation, we need four additional bytes
1261                          * to encode the entire ServerECDHParams
1262                          * structure. 
1263                          */
1264                         n = 4 + encodedlen;
1265
1266                         /* We'll generate the serverKeyExchange message
1267                          * explicitly so we can set these to NULLs
1268                          */
1269                         r[0]=NULL;
1270                         r[1]=NULL;
1271                         r[2]=NULL;
1272                         r[3]=NULL;
1273                         }
1274                 else 
1275 #endif /* !OPENSSL_NO_ECDH */
1276 #ifndef OPENSSL_NO_PSK
1277                         if (type & SSL_kPSK)
1278                                 {
1279                                 /* reserve size for record length and PSK identity hint*/
1280                                 n+=2+strlen(s->ctx->psk_identity_hint);
1281                                 }
1282                         else
1283 #endif /* !OPENSSL_NO_PSK */
1284                         {
1285                         al=SSL_AD_HANDSHAKE_FAILURE;
1286                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1287                         goto f_err;
1288                         }
1289                 for (i=0; r[i] != NULL; i++)
1290                         {
1291                         nr[i]=BN_num_bytes(r[i]);
1292                         n+=2+nr[i];
1293                         }
1294
1295                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1296                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1297                         {
1298                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1299                                 == NULL)
1300                                 {
1301                                 al=SSL_AD_DECODE_ERROR;
1302                                 goto f_err;
1303                                 }
1304                         kn=EVP_PKEY_size(pkey);
1305                         }
1306                 else
1307                         {
1308                         pkey=NULL;
1309                         kn=0;
1310                         }
1311
1312                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1313                         {
1314                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1315                         goto err;
1316                         }
1317                 d=(unsigned char *)s->init_buf->data;
1318                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1319
1320                 for (i=0; r[i] != NULL; i++)
1321                         {
1322                         s2n(nr[i],p);
1323                         BN_bn2bin(r[i],p);
1324                         p+=nr[i];
1325                         }
1326
1327 #ifndef OPENSSL_NO_ECDH
1328                 if (type & SSL_kEECDH) 
1329                         {
1330                         /* XXX: For now, we only support named (not generic) curves.
1331                          * In this situation, the serverKeyExchange message has:
1332                          * [1 byte CurveType], [2 byte CurveName]
1333                          * [1 byte length of encoded point], followed by
1334                          * the actual encoded point itself
1335                          */
1336                         *p = NAMED_CURVE_TYPE;
1337                         p += 1;
1338                         *p = 0;
1339                         p += 1;
1340                         *p = curve_id;
1341                         p += 1;
1342                         *p = encodedlen;
1343                         p += 1;
1344                         memcpy((unsigned char*)p, 
1345                             (unsigned char *)encodedPoint, 
1346                             encodedlen);
1347                         OPENSSL_free(encodedPoint);
1348                         p += encodedlen;
1349                         }
1350 #endif
1351
1352 #ifndef OPENSSL_NO_PSK
1353                 if (type & SSL_kPSK)
1354                         {
1355                         /* copy PSK identity hint */
1356                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1357                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1358                         p+=strlen(s->ctx->psk_identity_hint);
1359                         }
1360 #endif
1361
1362                 /* not anonymous */
1363                 if (pkey != NULL)
1364                         {
1365                         /* n is the length of the params, they start at
1366                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1367                          * at the end. */
1368 #ifndef OPENSSL_NO_RSA
1369                         if (pkey->type == EVP_PKEY_RSA)
1370                                 {
1371                                 q=md_buf;
1372                                 j=0;
1373                                 for (num=2; num > 0; num--)
1374                                         {
1375                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1376                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1377                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1378                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1379                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1380                                         EVP_DigestFinal_ex(&md_ctx,q,
1381                                                 (unsigned int *)&i);
1382                                         q+=i;
1383                                         j+=i;
1384                                         }
1385                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1386                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1387                                         {
1388                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1389                                         goto err;
1390                                         }
1391                                 s2n(u,p);
1392                                 n+=u+2;
1393                                 }
1394                         else
1395 #endif
1396 #if !defined(OPENSSL_NO_DSA)
1397                                 if (pkey->type == EVP_PKEY_DSA)
1398                                 {
1399                                 /* lets do DSS */
1400                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1401                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1402                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1403                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1404                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1405                                         (unsigned int *)&i,pkey))
1406                                         {
1407                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1408                                         goto err;
1409                                         }
1410                                 s2n(i,p);
1411                                 n+=i+2;
1412                                 }
1413                         else
1414 #endif
1415 #if !defined(OPENSSL_NO_ECDSA)
1416                                 if (pkey->type == EVP_PKEY_EC)
1417                                 {
1418                                 /* let's do ECDSA */
1419                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1420                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1421                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1422                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1423                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1424                                         (unsigned int *)&i,pkey))
1425                                         {
1426                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1427                                         goto err;
1428                                         }
1429                                 s2n(i,p);
1430                                 n+=i+2;
1431                                 }
1432                         else
1433 #endif
1434                                 {
1435                                 /* Is this error check actually needed? */
1436                                 al=SSL_AD_HANDSHAKE_FAILURE;
1437                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1438                                 goto f_err;
1439                                 }
1440                         }
1441
1442                 d = dtls1_set_message_header(s, d,
1443                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1444
1445                 /* we should now have things packed up, so lets send
1446                  * it off */
1447                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1448                 s->init_off=0;
1449
1450                 /* buffer the message to handle re-xmits */
1451                 dtls1_buffer_message(s, 0);
1452                 }
1453
1454         s->state = SSL3_ST_SW_KEY_EXCH_B;
1455         EVP_MD_CTX_cleanup(&md_ctx);
1456         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1457 f_err:
1458         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1459 err:
1460 #ifndef OPENSSL_NO_ECDH
1461         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1462         BN_CTX_free(bn_ctx);
1463 #endif
1464         EVP_MD_CTX_cleanup(&md_ctx);
1465         return(-1);
1466         }
1467
1468 int dtls1_send_certificate_request(SSL *s)
1469         {
1470         unsigned char *p,*d;
1471         int i,j,nl,off,n;
1472         STACK_OF(X509_NAME) *sk=NULL;
1473         X509_NAME *name;
1474         BUF_MEM *buf;
1475         unsigned int msg_len;
1476
1477         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1478                 {
1479                 buf=s->init_buf;
1480
1481                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1482
1483                 /* get the list of acceptable cert types */
1484                 p++;
1485                 n=ssl3_get_req_cert_type(s,p);
1486                 d[0]=n;
1487                 p+=n;
1488                 n++;
1489
1490                 off=n;
1491                 p+=2;
1492                 n+=2;
1493
1494                 sk=SSL_get_client_CA_list(s);
1495                 nl=0;
1496                 if (sk != NULL)
1497                         {
1498                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1499                                 {
1500                                 name=sk_X509_NAME_value(sk,i);
1501                                 j=i2d_X509_NAME(name,NULL);
1502                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1503                                         {
1504                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1505                                         goto err;
1506                                         }
1507                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1508                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1509                                         {
1510                                         s2n(j,p);
1511                                         i2d_X509_NAME(name,&p);
1512                                         n+=2+j;
1513                                         nl+=2+j;
1514                                         }
1515                                 else
1516                                         {
1517                                         d=p;
1518                                         i2d_X509_NAME(name,&p);
1519                                         j-=2; s2n(j,d); j+=2;
1520                                         n+=j;
1521                                         nl+=j;
1522                                         }
1523                                 }
1524                         }
1525                 /* else no CA names */
1526                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1527                 s2n(nl,p);
1528
1529                 d=(unsigned char *)buf->data;
1530                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1531                 l2n3(n,d);
1532                 s2n(s->d1->handshake_write_seq,d);
1533                 s->d1->handshake_write_seq++;
1534
1535                 /* we should now have things packed up, so lets send
1536                  * it off */
1537
1538                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1539                 s->init_off=0;
1540 #ifdef NETSCAPE_HANG_BUG
1541 /* XXX: what to do about this? */
1542                 p=(unsigned char *)s->init_buf->data + s->init_num;
1543
1544                 /* do the header */
1545                 *(p++)=SSL3_MT_SERVER_DONE;
1546                 *(p++)=0;
1547                 *(p++)=0;
1548                 *(p++)=0;
1549                 s->init_num += 4;
1550 #endif
1551
1552                 /* XDTLS:  set message header ? */
1553                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1554                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1555                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1556
1557                 /* buffer the message to handle re-xmits */
1558                 dtls1_buffer_message(s, 0);
1559
1560                 s->state = SSL3_ST_SW_CERT_REQ_B;
1561                 }
1562
1563         /* SSL3_ST_SW_CERT_REQ_B */
1564         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1565 err:
1566         return(-1);
1567         }
1568
1569 int dtls1_send_server_certificate(SSL *s)
1570         {
1571         unsigned long l;
1572         CERT_PKEY *cpk;
1573
1574         if (s->state == SSL3_ST_SW_CERT_A)
1575                 {
1576                 cpk=ssl_get_server_send_pkey(s);
1577                 if (cpk == NULL)
1578                         {
1579                         /* VRS: allow null cert if auth == KRB5 */
1580                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1581                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1582                                 {
1583                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1584                                 return(0);
1585                                 }
1586                         }
1587
1588                 l=dtls1_output_cert_chain(s,cpk);
1589                 s->state=SSL3_ST_SW_CERT_B;
1590                 s->init_num=(int)l;
1591                 s->init_off=0;
1592
1593                 /* buffer the message to handle re-xmits */
1594                 dtls1_buffer_message(s, 0);
1595                 }
1596
1597         /* SSL3_ST_SW_CERT_B */
1598         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1599         }
1600
1601 #ifndef OPENSSL_NO_TLSEXT
1602 int dtls1_send_newsession_ticket(SSL *s)
1603         {
1604         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1605                 {
1606                 unsigned char *p, *senc, *macstart;
1607                 int len, slen;
1608                 unsigned int hlen, msg_len;
1609                 EVP_CIPHER_CTX ctx;
1610                 HMAC_CTX hctx;
1611                 SSL_CTX *tctx = s->initial_ctx;
1612                 unsigned char iv[EVP_MAX_IV_LENGTH];
1613                 unsigned char key_name[16];
1614
1615                 /* get session encoding length */
1616                 slen = i2d_SSL_SESSION(s->session, NULL);
1617                 /* Some length values are 16 bits, so forget it if session is
1618                  * too long
1619                  */
1620                 if (slen > 0xFF00)
1621                         return -1;
1622                 /* Grow buffer if need be: the length calculation is as
1623                  * follows 12 (DTLS handshake message header) +
1624                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1625                  * 16 (key name) + max_iv_len (iv length) +
1626                  * session_length + max_enc_block_size (max encrypted session
1627                  * length) + max_md_size (HMAC).
1628                  */
1629                 if (!BUF_MEM_grow(s->init_buf,
1630                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1631                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1632                         return -1;
1633                 senc = OPENSSL_malloc(slen);
1634                 if (!senc)
1635                         return -1;
1636                 p = senc;
1637                 i2d_SSL_SESSION(s->session, &p);
1638
1639                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1640                 EVP_CIPHER_CTX_init(&ctx);
1641                 HMAC_CTX_init(&hctx);
1642                 /* Initialize HMAC and cipher contexts. If callback present
1643                  * it does all the work otherwise use generated values
1644                  * from parent ctx.
1645                  */
1646                 if (tctx->tlsext_ticket_key_cb)
1647                         {
1648                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1649                                                          &hctx, 1) < 0)
1650                                 {
1651                                 OPENSSL_free(senc);
1652                                 return -1;
1653                                 }
1654                         }
1655                 else
1656                         {
1657                         RAND_pseudo_bytes(iv, 16);
1658                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1659                                         tctx->tlsext_tick_aes_key, iv);
1660                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1661                                         tlsext_tick_md(), NULL);
1662                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1663                         }
1664                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1665                 /* Skip ticket length for now */
1666                 p += 2;
1667                 /* Output key name */
1668                 macstart = p;
1669                 memcpy(p, key_name, 16);
1670                 p += 16;
1671                 /* output IV */
1672                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1673                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1674                 /* Encrypt session data */
1675                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1676                 p += len;
1677                 EVP_EncryptFinal(&ctx, p, &len);
1678                 p += len;
1679                 EVP_CIPHER_CTX_cleanup(&ctx);
1680
1681                 HMAC_Update(&hctx, macstart, p - macstart);
1682                 HMAC_Final(&hctx, p, &hlen);
1683                 HMAC_CTX_cleanup(&hctx);
1684
1685                 p += hlen;
1686                 /* Now write out lengths: p points to end of data written */
1687                 /* Total length */
1688                 len = p - (unsigned char *)(s->init_buf->data);
1689                 /* Ticket length */
1690                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1691                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1692
1693                 /* number of bytes to write */
1694                 s->init_num= len;
1695                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1696                 s->init_off=0;
1697                 OPENSSL_free(senc);
1698
1699                 /* XDTLS:  set message header ? */
1700                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1701                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1702                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1703
1704                 /* buffer the message to handle re-xmits */
1705                 dtls1_buffer_message(s, 0);
1706                 }
1707
1708         /* SSL3_ST_SW_SESSION_TICKET_B */
1709         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1710         }
1711 #endif