SSL export fixes (from Adam Langley) [original from 1.0.1]
[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                         dtls1_stop_timer(s);
595                         if (ret == 2)
596                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
597                         else {
598                                 /* could be sent for a DH cert, even if we
599                                  * have not asked for it :-) */
600                                 ret=ssl3_get_client_certificate(s);
601                                 if (ret <= 0) goto end;
602                                 dtls1_stop_timer(s);
603                                 s->init_num=0;
604                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
605                         }
606                         break;
607
608                 case SSL3_ST_SR_KEY_EXCH_A:
609                 case SSL3_ST_SR_KEY_EXCH_B:
610                         ret=ssl3_get_client_key_exchange(s);
611                         if (ret <= 0) goto end;
612                         dtls1_stop_timer(s);
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                         dtls1_stop_timer(s);
665 #ifndef OPENSSL_NO_SCTP
666                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
667                             state == SSL_ST_RENEGOTIATE)
668                                 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
669                         else
670 #endif                  
671                                 s->state=SSL3_ST_SR_FINISHED_A;
672                         s->init_num=0;
673                         break;
674
675                 case SSL3_ST_SR_FINISHED_A:
676                 case SSL3_ST_SR_FINISHED_B:
677                         s->d1->change_cipher_spec_ok = 1;
678                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
679                                 SSL3_ST_SR_FINISHED_B);
680                         if (ret <= 0) goto end;
681                         dtls1_stop_timer(s);
682                         if (s->hit)
683                                 s->state=SSL_ST_OK;
684 #ifndef OPENSSL_NO_TLSEXT
685                         else if (s->tlsext_ticket_expected)
686                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
687 #endif
688                         else
689                                 s->state=SSL3_ST_SW_CHANGE_A;
690                         s->init_num=0;
691                         break;
692
693 #ifndef OPENSSL_NO_TLSEXT
694                 case SSL3_ST_SW_SESSION_TICKET_A:
695                 case SSL3_ST_SW_SESSION_TICKET_B:
696                         ret=dtls1_send_newsession_ticket(s);
697                         if (ret <= 0) goto end;
698                         s->state=SSL3_ST_SW_CHANGE_A;
699                         s->init_num=0;
700                         break;
701
702                 case SSL3_ST_SW_CERT_STATUS_A:
703                 case SSL3_ST_SW_CERT_STATUS_B:
704                         ret=ssl3_send_cert_status(s);
705                         if (ret <= 0) goto end;
706                         s->state=SSL3_ST_SW_KEY_EXCH_A;
707                         s->init_num=0;
708                         break;
709
710 #endif
711
712                 case SSL3_ST_SW_CHANGE_A:
713                 case SSL3_ST_SW_CHANGE_B:
714
715                         s->session->cipher=s->s3->tmp.new_cipher;
716                         if (!s->method->ssl3_enc->setup_key_block(s))
717                                 { ret= -1; goto end; }
718
719                         ret=dtls1_send_change_cipher_spec(s,
720                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
721
722                         if (ret <= 0) goto end;
723
724 #ifndef OPENSSL_NO_SCTP
725                         /* Change to new shared key of SCTP-Auth,
726                          * will be ignored if no SCTP used.
727                          */
728                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
729 #endif
730
731                         s->state=SSL3_ST_SW_FINISHED_A;
732                         s->init_num=0;
733
734                         if (!s->method->ssl3_enc->change_cipher_state(s,
735                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
736                                 {
737                                 ret= -1;
738                                 goto end;
739                                 }
740
741                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
742                         break;
743
744                 case SSL3_ST_SW_FINISHED_A:
745                 case SSL3_ST_SW_FINISHED_B:
746                         ret=dtls1_send_finished(s,
747                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
748                                 s->method->ssl3_enc->server_finished_label,
749                                 s->method->ssl3_enc->server_finished_label_len);
750                         if (ret <= 0) goto end;
751                         s->state=SSL3_ST_SW_FLUSH;
752                         if (s->hit)
753                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
754                         else
755                                 {
756                                 s->s3->tmp.next_state=SSL_ST_OK;
757 #ifndef OPENSSL_NO_SCTP
758                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
759                                         {
760                                         s->d1->next_state = s->s3->tmp.next_state;
761                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
762                                         }
763 #endif
764                                 }
765                         s->init_num=0;
766                         break;
767
768                 case SSL_ST_OK:
769                         /* clean a few things up */
770                         ssl3_cleanup_key_block(s);
771
772 #if 0
773                         BUF_MEM_free(s->init_buf);
774                         s->init_buf=NULL;
775 #endif
776
777                         /* remove buffering on output */
778                         ssl_free_wbio_buffer(s);
779
780                         s->init_num=0;
781
782                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
783                                 {
784                                 s->renegotiate=0;
785                                 s->new_session=0;
786                                 
787                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
788                                 
789                                 s->ctx->stats.sess_accept_good++;
790                                 /* s->server=1; */
791                                 s->handshake_func=dtls1_accept;
792
793                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
794                                 }
795                         
796                         ret = 1;
797
798                         /* done handshaking, next message is client hello */
799                         s->d1->handshake_read_seq = 0;
800                         /* next message is server hello */
801                         s->d1->handshake_write_seq = 0;
802                         s->d1->next_handshake_write_seq = 0;
803                         goto end;
804                         /* break; */
805
806                 default:
807                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
808                         ret= -1;
809                         goto end;
810                         /* break; */
811                         }
812                 
813                 if (!s->s3->tmp.reuse_message && !skip)
814                         {
815                         if (s->debug)
816                                 {
817                                 if ((ret=BIO_flush(s->wbio)) <= 0)
818                                         goto end;
819                                 }
820
821
822                         if ((cb != NULL) && (s->state != state))
823                                 {
824                                 new_state=s->state;
825                                 s->state=state;
826                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
827                                 s->state=new_state;
828                                 }
829                         }
830                 skip=0;
831                 }
832 end:
833         /* BIO_flush(s->wbio); */
834
835         s->in_handshake--;
836 #ifndef OPENSSL_NO_SCTP
837                 /* Notify SCTP BIO socket to leave handshake
838                  * mode and prevent stream identifier other
839                  * than 0. Will be ignored if no SCTP is used.
840                  */
841                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
842 #endif
843
844         if (cb != NULL)
845                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
846         return(ret);
847         }
848
849 int dtls1_send_hello_request(SSL *s)
850         {
851         unsigned char *p;
852
853         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
854                 {
855                 p=(unsigned char *)s->init_buf->data;
856                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
857
858                 s->state=SSL3_ST_SW_HELLO_REQ_B;
859                 /* number of bytes to write */
860                 s->init_num=DTLS1_HM_HEADER_LENGTH;
861                 s->init_off=0;
862
863                 /* no need to buffer this message, since there are no retransmit 
864                  * requests for it */
865                 }
866
867         /* SSL3_ST_SW_HELLO_REQ_B */
868         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
869         }
870
871 int dtls1_send_hello_verify_request(SSL *s)
872         {
873         unsigned int msg_len;
874         unsigned char *msg, *buf, *p;
875
876         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
877                 {
878                 buf = (unsigned char *)s->init_buf->data;
879
880                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
881                 *(p++) = s->version >> 8;
882                 *(p++) = s->version & 0xFF;
883
884                 if (s->ctx->app_gen_cookie_cb == NULL ||
885                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
886                          &(s->d1->cookie_len)) == 0)
887                         {
888                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
889                         return 0;
890                         }
891
892                 *(p++) = (unsigned char) s->d1->cookie_len;
893                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
894                 p += s->d1->cookie_len;
895                 msg_len = p - msg;
896
897                 dtls1_set_message_header(s, buf,
898                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
899
900                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
901                 /* number of bytes to write */
902                 s->init_num=p-buf;
903                 s->init_off=0;
904                 }
905
906         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
907         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
908         }
909
910 int dtls1_send_server_hello(SSL *s)
911         {
912         unsigned char *buf;
913         unsigned char *p,*d;
914         int i;
915         unsigned int sl;
916         unsigned long l,Time;
917
918         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
919                 {
920                 buf=(unsigned char *)s->init_buf->data;
921                 p=s->s3->server_random;
922                 Time=(unsigned long)time(NULL);                 /* Time */
923                 l2n(Time,p);
924                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
925                 /* Do the message type and length last */
926                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
927
928                 *(p++)=s->version>>8;
929                 *(p++)=s->version&0xff;
930
931                 /* Random stuff */
932                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
933                 p+=SSL3_RANDOM_SIZE;
934
935                 /* now in theory we have 3 options to sending back the
936                  * session id.  If it is a re-use, we send back the
937                  * old session-id, if it is a new session, we send
938                  * back the new session-id or we send back a 0 length
939                  * session-id if we want it to be single use.
940                  * Currently I will not implement the '0' length session-id
941                  * 12-Jan-98 - I'll now support the '0' length stuff.
942                  */
943                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
944                         s->session->session_id_length=0;
945
946                 sl=s->session->session_id_length;
947                 if (sl > sizeof s->session->session_id)
948                         {
949                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
950                         return -1;
951                         }
952                 *(p++)=sl;
953                 memcpy(p,s->session->session_id,sl);
954                 p+=sl;
955
956                 /* put the cipher */
957                 if (s->s3->tmp.new_cipher == NULL)
958                         return -1;
959                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
960                 p+=i;
961
962                 /* put the compression method */
963 #ifdef OPENSSL_NO_COMP
964                 *(p++)=0;
965 #else
966                 if (s->s3->tmp.new_compression == NULL)
967                         *(p++)=0;
968                 else
969                         *(p++)=s->s3->tmp.new_compression->id;
970 #endif
971
972 #ifndef OPENSSL_NO_TLSEXT
973                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
974                         {
975                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
976                         return -1;
977                         }
978 #endif
979
980                 /* do the header */
981                 l=(p-d);
982                 d=buf;
983
984                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
985
986                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
987                 /* number of bytes to write */
988                 s->init_num=p-buf;
989                 s->init_off=0;
990
991                 /* buffer the message to handle re-xmits */
992                 dtls1_buffer_message(s, 0);
993                 }
994
995         /* SSL3_ST_SW_SRVR_HELLO_B */
996         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
997         }
998
999 int dtls1_send_server_done(SSL *s)
1000         {
1001         unsigned char *p;
1002
1003         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1004                 {
1005                 p=(unsigned char *)s->init_buf->data;
1006
1007                 /* do the header */
1008                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1009
1010                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1011                 /* number of bytes to write */
1012                 s->init_num=DTLS1_HM_HEADER_LENGTH;
1013                 s->init_off=0;
1014
1015                 /* buffer the message to handle re-xmits */
1016                 dtls1_buffer_message(s, 0);
1017                 }
1018
1019         /* SSL3_ST_SW_SRVR_DONE_B */
1020         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1021         }
1022
1023 int dtls1_send_server_key_exchange(SSL *s)
1024         {
1025 #ifndef OPENSSL_NO_RSA
1026         unsigned char *q;
1027         int j,num;
1028         RSA *rsa;
1029         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1030         unsigned int u;
1031 #endif
1032 #ifndef OPENSSL_NO_DH
1033         DH *dh=NULL,*dhp;
1034 #endif
1035 #ifndef OPENSSL_NO_ECDH
1036         EC_KEY *ecdh=NULL, *ecdhp;
1037         unsigned char *encodedPoint = NULL;
1038         int encodedlen = 0;
1039         int curve_id = 0;
1040         BN_CTX *bn_ctx = NULL; 
1041 #endif
1042         EVP_PKEY *pkey;
1043         unsigned char *p,*d;
1044         int al,i;
1045         unsigned long type;
1046         int n;
1047         CERT *cert;
1048         BIGNUM *r[4];
1049         int nr[4],kn;
1050         BUF_MEM *buf;
1051         EVP_MD_CTX md_ctx;
1052
1053         EVP_MD_CTX_init(&md_ctx);
1054         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1055                 {
1056                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1057                 cert=s->cert;
1058
1059                 buf=s->init_buf;
1060
1061                 r[0]=r[1]=r[2]=r[3]=NULL;
1062                 n=0;
1063 #ifndef OPENSSL_NO_RSA
1064                 if (type & SSL_kRSA)
1065                         {
1066                         rsa=cert->rsa_tmp;
1067                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1068                                 {
1069                                 rsa=s->cert->rsa_tmp_cb(s,
1070                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1071                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1072                                 if(rsa == NULL)
1073                                 {
1074                                         al=SSL_AD_HANDSHAKE_FAILURE;
1075                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1076                                         goto f_err;
1077                                 }
1078                                 RSA_up_ref(rsa);
1079                                 cert->rsa_tmp=rsa;
1080                                 }
1081                         if (rsa == NULL)
1082                                 {
1083                                 al=SSL_AD_HANDSHAKE_FAILURE;
1084                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1085                                 goto f_err;
1086                                 }
1087                         r[0]=rsa->n;
1088                         r[1]=rsa->e;
1089                         s->s3->tmp.use_rsa_tmp=1;
1090                         }
1091                 else
1092 #endif
1093 #ifndef OPENSSL_NO_DH
1094                         if (type & SSL_kEDH)
1095                         {
1096                         dhp=cert->dh_tmp;
1097                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1098                                 dhp=s->cert->dh_tmp_cb(s,
1099                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1100                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1101                         if (dhp == NULL)
1102                                 {
1103                                 al=SSL_AD_HANDSHAKE_FAILURE;
1104                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1105                                 goto f_err;
1106                                 }
1107
1108                         if (s->s3->tmp.dh != NULL)
1109                                 {
1110                                 DH_free(dh);
1111                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1112                                 goto err;
1113                                 }
1114
1115                         if ((dh=DHparams_dup(dhp)) == NULL)
1116                                 {
1117                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1118                                 goto err;
1119                                 }
1120
1121                         s->s3->tmp.dh=dh;
1122                         if ((dhp->pub_key == NULL ||
1123                              dhp->priv_key == NULL ||
1124                              (s->options & SSL_OP_SINGLE_DH_USE)))
1125                                 {
1126                                 if(!DH_generate_key(dh))
1127                                     {
1128                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1129                                            ERR_R_DH_LIB);
1130                                     goto err;
1131                                     }
1132                                 }
1133                         else
1134                                 {
1135                                 dh->pub_key=BN_dup(dhp->pub_key);
1136                                 dh->priv_key=BN_dup(dhp->priv_key);
1137                                 if ((dh->pub_key == NULL) ||
1138                                         (dh->priv_key == NULL))
1139                                         {
1140                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1141                                         goto err;
1142                                         }
1143                                 }
1144                         r[0]=dh->p;
1145                         r[1]=dh->g;
1146                         r[2]=dh->pub_key;
1147                         }
1148                 else 
1149 #endif
1150 #ifndef OPENSSL_NO_ECDH
1151                         if (type & SSL_kEECDH)
1152                         {
1153                         const EC_GROUP *group;
1154
1155                         ecdhp=cert->ecdh_tmp;
1156                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1157                                 {
1158                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1159                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1160                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1161                                 }
1162                         if (ecdhp == NULL)
1163                                 {
1164                                 al=SSL_AD_HANDSHAKE_FAILURE;
1165                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1166                                 goto f_err;
1167                                 }
1168
1169                         if (s->s3->tmp.ecdh != NULL)
1170                                 {
1171                                 EC_KEY_free(s->s3->tmp.ecdh); 
1172                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1173                                 goto err;
1174                                 }
1175
1176                         /* Duplicate the ECDH structure. */
1177                         if (ecdhp == NULL)
1178                                 {
1179                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1180                                 goto err;
1181                                 }
1182                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1183                                 {
1184                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1185                                 goto err;
1186                                 }
1187
1188                         s->s3->tmp.ecdh=ecdh;
1189                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1190                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1191                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1192                                 {
1193                                 if(!EC_KEY_generate_key(ecdh))
1194                                     {
1195                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1196                                     goto err;
1197                                     }
1198                                 }
1199
1200                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1201                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1202                             (EC_KEY_get0_private_key(ecdh) == NULL))
1203                                 {
1204                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1205                                 goto err;
1206                                 }
1207
1208                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1209                             (EC_GROUP_get_degree(group) > 163)) 
1210                                 {
1211                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1212                                 goto err;
1213                                 }
1214
1215                         /* XXX: For now, we only support ephemeral ECDH
1216                          * keys over named (not generic) curves. For 
1217                          * supported named curves, curve_id is non-zero.
1218                          */
1219                         if ((curve_id = 
1220                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1221                             == 0)
1222                                 {
1223                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1224                                 goto err;
1225                                 }
1226
1227                         /* Encode the public key.
1228                          * First check the size of encoding and
1229                          * allocate memory accordingly.
1230                          */
1231                         encodedlen = EC_POINT_point2oct(group, 
1232                             EC_KEY_get0_public_key(ecdh),
1233                             POINT_CONVERSION_UNCOMPRESSED, 
1234                             NULL, 0, NULL);
1235
1236                         encodedPoint = (unsigned char *) 
1237                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1238                         bn_ctx = BN_CTX_new();
1239                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1240                                 {
1241                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1242                                 goto err;
1243                                 }
1244
1245
1246                         encodedlen = EC_POINT_point2oct(group, 
1247                             EC_KEY_get0_public_key(ecdh), 
1248                             POINT_CONVERSION_UNCOMPRESSED, 
1249                             encodedPoint, encodedlen, bn_ctx);
1250
1251                         if (encodedlen == 0) 
1252                                 {
1253                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1254                                 goto err;
1255                                 }
1256
1257                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1258
1259                         /* XXX: For now, we only support named (not 
1260                          * generic) curves in ECDH ephemeral key exchanges.
1261                          * In this situation, we need four additional bytes
1262                          * to encode the entire ServerECDHParams
1263                          * structure. 
1264                          */
1265                         n = 4 + encodedlen;
1266
1267                         /* We'll generate the serverKeyExchange message
1268                          * explicitly so we can set these to NULLs
1269                          */
1270                         r[0]=NULL;
1271                         r[1]=NULL;
1272                         r[2]=NULL;
1273                         r[3]=NULL;
1274                         }
1275                 else 
1276 #endif /* !OPENSSL_NO_ECDH */
1277 #ifndef OPENSSL_NO_PSK
1278                         if (type & SSL_kPSK)
1279                                 {
1280                                 /* reserve size for record length and PSK identity hint*/
1281                                 n+=2+strlen(s->ctx->psk_identity_hint);
1282                                 }
1283                         else
1284 #endif /* !OPENSSL_NO_PSK */
1285                         {
1286                         al=SSL_AD_HANDSHAKE_FAILURE;
1287                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1288                         goto f_err;
1289                         }
1290                 for (i=0; r[i] != NULL; i++)
1291                         {
1292                         nr[i]=BN_num_bytes(r[i]);
1293                         n+=2+nr[i];
1294                         }
1295
1296                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1297                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1298                         {
1299                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1300                                 == NULL)
1301                                 {
1302                                 al=SSL_AD_DECODE_ERROR;
1303                                 goto f_err;
1304                                 }
1305                         kn=EVP_PKEY_size(pkey);
1306                         }
1307                 else
1308                         {
1309                         pkey=NULL;
1310                         kn=0;
1311                         }
1312
1313                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1314                         {
1315                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1316                         goto err;
1317                         }
1318                 d=(unsigned char *)s->init_buf->data;
1319                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1320
1321                 for (i=0; r[i] != NULL; i++)
1322                         {
1323                         s2n(nr[i],p);
1324                         BN_bn2bin(r[i],p);
1325                         p+=nr[i];
1326                         }
1327
1328 #ifndef OPENSSL_NO_ECDH
1329                 if (type & SSL_kEECDH) 
1330                         {
1331                         /* XXX: For now, we only support named (not generic) curves.
1332                          * In this situation, the serverKeyExchange message has:
1333                          * [1 byte CurveType], [2 byte CurveName]
1334                          * [1 byte length of encoded point], followed by
1335                          * the actual encoded point itself
1336                          */
1337                         *p = NAMED_CURVE_TYPE;
1338                         p += 1;
1339                         *p = 0;
1340                         p += 1;
1341                         *p = curve_id;
1342                         p += 1;
1343                         *p = encodedlen;
1344                         p += 1;
1345                         memcpy((unsigned char*)p, 
1346                             (unsigned char *)encodedPoint, 
1347                             encodedlen);
1348                         OPENSSL_free(encodedPoint);
1349                         p += encodedlen;
1350                         }
1351 #endif
1352
1353 #ifndef OPENSSL_NO_PSK
1354                 if (type & SSL_kPSK)
1355                         {
1356                         /* copy PSK identity hint */
1357                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1358                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1359                         p+=strlen(s->ctx->psk_identity_hint);
1360                         }
1361 #endif
1362
1363                 /* not anonymous */
1364                 if (pkey != NULL)
1365                         {
1366                         /* n is the length of the params, they start at
1367                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1368                          * at the end. */
1369 #ifndef OPENSSL_NO_RSA
1370                         if (pkey->type == EVP_PKEY_RSA)
1371                                 {
1372                                 q=md_buf;
1373                                 j=0;
1374                                 for (num=2; num > 0; num--)
1375                                         {
1376                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1377                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1378                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1379                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1380                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1381                                         EVP_DigestFinal_ex(&md_ctx,q,
1382                                                 (unsigned int *)&i);
1383                                         q+=i;
1384                                         j+=i;
1385                                         }
1386                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1387                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1388                                         {
1389                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1390                                         goto err;
1391                                         }
1392                                 s2n(u,p);
1393                                 n+=u+2;
1394                                 }
1395                         else
1396 #endif
1397 #if !defined(OPENSSL_NO_DSA)
1398                                 if (pkey->type == EVP_PKEY_DSA)
1399                                 {
1400                                 /* lets do DSS */
1401                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1402                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1403                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1404                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1405                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1406                                         (unsigned int *)&i,pkey))
1407                                         {
1408                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1409                                         goto err;
1410                                         }
1411                                 s2n(i,p);
1412                                 n+=i+2;
1413                                 }
1414                         else
1415 #endif
1416 #if !defined(OPENSSL_NO_ECDSA)
1417                                 if (pkey->type == EVP_PKEY_EC)
1418                                 {
1419                                 /* let's do ECDSA */
1420                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1421                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1422                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1423                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1424                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1425                                         (unsigned int *)&i,pkey))
1426                                         {
1427                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1428                                         goto err;
1429                                         }
1430                                 s2n(i,p);
1431                                 n+=i+2;
1432                                 }
1433                         else
1434 #endif
1435                                 {
1436                                 /* Is this error check actually needed? */
1437                                 al=SSL_AD_HANDSHAKE_FAILURE;
1438                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1439                                 goto f_err;
1440                                 }
1441                         }
1442
1443                 d = dtls1_set_message_header(s, d,
1444                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1445
1446                 /* we should now have things packed up, so lets send
1447                  * it off */
1448                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1449                 s->init_off=0;
1450
1451                 /* buffer the message to handle re-xmits */
1452                 dtls1_buffer_message(s, 0);
1453                 }
1454
1455         s->state = SSL3_ST_SW_KEY_EXCH_B;
1456         EVP_MD_CTX_cleanup(&md_ctx);
1457         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1458 f_err:
1459         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1460 err:
1461 #ifndef OPENSSL_NO_ECDH
1462         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1463         BN_CTX_free(bn_ctx);
1464 #endif
1465         EVP_MD_CTX_cleanup(&md_ctx);
1466         return(-1);
1467         }
1468
1469 int dtls1_send_certificate_request(SSL *s)
1470         {
1471         unsigned char *p,*d;
1472         int i,j,nl,off,n;
1473         STACK_OF(X509_NAME) *sk=NULL;
1474         X509_NAME *name;
1475         BUF_MEM *buf;
1476         unsigned int msg_len;
1477
1478         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1479                 {
1480                 buf=s->init_buf;
1481
1482                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1483
1484                 /* get the list of acceptable cert types */
1485                 p++;
1486                 n=ssl3_get_req_cert_type(s,p);
1487                 d[0]=n;
1488                 p+=n;
1489                 n++;
1490
1491                 off=n;
1492                 p+=2;
1493                 n+=2;
1494
1495                 sk=SSL_get_client_CA_list(s);
1496                 nl=0;
1497                 if (sk != NULL)
1498                         {
1499                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1500                                 {
1501                                 name=sk_X509_NAME_value(sk,i);
1502                                 j=i2d_X509_NAME(name,NULL);
1503                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1504                                         {
1505                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1506                                         goto err;
1507                                         }
1508                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1509                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1510                                         {
1511                                         s2n(j,p);
1512                                         i2d_X509_NAME(name,&p);
1513                                         n+=2+j;
1514                                         nl+=2+j;
1515                                         }
1516                                 else
1517                                         {
1518                                         d=p;
1519                                         i2d_X509_NAME(name,&p);
1520                                         j-=2; s2n(j,d); j+=2;
1521                                         n+=j;
1522                                         nl+=j;
1523                                         }
1524                                 }
1525                         }
1526                 /* else no CA names */
1527                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1528                 s2n(nl,p);
1529
1530                 d=(unsigned char *)buf->data;
1531                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1532                 l2n3(n,d);
1533                 s2n(s->d1->handshake_write_seq,d);
1534                 s->d1->handshake_write_seq++;
1535
1536                 /* we should now have things packed up, so lets send
1537                  * it off */
1538
1539                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1540                 s->init_off=0;
1541 #ifdef NETSCAPE_HANG_BUG
1542 /* XXX: what to do about this? */
1543                 p=(unsigned char *)s->init_buf->data + s->init_num;
1544
1545                 /* do the header */
1546                 *(p++)=SSL3_MT_SERVER_DONE;
1547                 *(p++)=0;
1548                 *(p++)=0;
1549                 *(p++)=0;
1550                 s->init_num += 4;
1551 #endif
1552
1553                 /* XDTLS:  set message header ? */
1554                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1555                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1556                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1557
1558                 /* buffer the message to handle re-xmits */
1559                 dtls1_buffer_message(s, 0);
1560
1561                 s->state = SSL3_ST_SW_CERT_REQ_B;
1562                 }
1563
1564         /* SSL3_ST_SW_CERT_REQ_B */
1565         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1566 err:
1567         return(-1);
1568         }
1569
1570 int dtls1_send_server_certificate(SSL *s)
1571         {
1572         unsigned long l;
1573         CERT_PKEY *cpk;
1574
1575         if (s->state == SSL3_ST_SW_CERT_A)
1576                 {
1577                 cpk=ssl_get_server_send_pkey(s);
1578                 if (cpk == NULL)
1579                         {
1580                         /* VRS: allow null cert if auth == KRB5 */
1581                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1582                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1583                                 {
1584                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1585                                 return(0);
1586                                 }
1587                         }
1588
1589                 l=dtls1_output_cert_chain(s,cpk);
1590                 s->state=SSL3_ST_SW_CERT_B;
1591                 s->init_num=(int)l;
1592                 s->init_off=0;
1593
1594                 /* buffer the message to handle re-xmits */
1595                 dtls1_buffer_message(s, 0);
1596                 }
1597
1598         /* SSL3_ST_SW_CERT_B */
1599         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1600         }
1601
1602 #ifndef OPENSSL_NO_TLSEXT
1603 int dtls1_send_newsession_ticket(SSL *s)
1604         {
1605         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1606                 {
1607                 unsigned char *p, *senc, *macstart;
1608                 int len, slen;
1609                 unsigned int hlen, msg_len;
1610                 EVP_CIPHER_CTX ctx;
1611                 HMAC_CTX hctx;
1612                 SSL_CTX *tctx = s->initial_ctx;
1613                 unsigned char iv[EVP_MAX_IV_LENGTH];
1614                 unsigned char key_name[16];
1615
1616                 /* get session encoding length */
1617                 slen = i2d_SSL_SESSION(s->session, NULL);
1618                 /* Some length values are 16 bits, so forget it if session is
1619                  * too long
1620                  */
1621                 if (slen > 0xFF00)
1622                         return -1;
1623                 /* Grow buffer if need be: the length calculation is as
1624                  * follows 12 (DTLS handshake message header) +
1625                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1626                  * 16 (key name) + max_iv_len (iv length) +
1627                  * session_length + max_enc_block_size (max encrypted session
1628                  * length) + max_md_size (HMAC).
1629                  */
1630                 if (!BUF_MEM_grow(s->init_buf,
1631                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1632                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1633                         return -1;
1634                 senc = OPENSSL_malloc(slen);
1635                 if (!senc)
1636                         return -1;
1637                 p = senc;
1638                 i2d_SSL_SESSION(s->session, &p);
1639
1640                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1641                 EVP_CIPHER_CTX_init(&ctx);
1642                 HMAC_CTX_init(&hctx);
1643                 /* Initialize HMAC and cipher contexts. If callback present
1644                  * it does all the work otherwise use generated values
1645                  * from parent ctx.
1646                  */
1647                 if (tctx->tlsext_ticket_key_cb)
1648                         {
1649                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1650                                                          &hctx, 1) < 0)
1651                                 {
1652                                 OPENSSL_free(senc);
1653                                 return -1;
1654                                 }
1655                         }
1656                 else
1657                         {
1658                         RAND_pseudo_bytes(iv, 16);
1659                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1660                                         tctx->tlsext_tick_aes_key, iv);
1661                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1662                                         tlsext_tick_md(), NULL);
1663                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1664                         }
1665                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1666                 /* Skip ticket length for now */
1667                 p += 2;
1668                 /* Output key name */
1669                 macstart = p;
1670                 memcpy(p, key_name, 16);
1671                 p += 16;
1672                 /* output IV */
1673                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1674                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1675                 /* Encrypt session data */
1676                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1677                 p += len;
1678                 EVP_EncryptFinal(&ctx, p, &len);
1679                 p += len;
1680                 EVP_CIPHER_CTX_cleanup(&ctx);
1681
1682                 HMAC_Update(&hctx, macstart, p - macstart);
1683                 HMAC_Final(&hctx, p, &hlen);
1684                 HMAC_CTX_cleanup(&hctx);
1685
1686                 p += hlen;
1687                 /* Now write out lengths: p points to end of data written */
1688                 /* Total length */
1689                 len = p - (unsigned char *)(s->init_buf->data);
1690                 /* Ticket length */
1691                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1692                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1693
1694                 /* number of bytes to write */
1695                 s->init_num= len;
1696                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1697                 s->init_off=0;
1698                 OPENSSL_free(senc);
1699
1700                 /* XDTLS:  set message header ? */
1701                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1702                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1703                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1704
1705                 /* buffer the message to handle re-xmits */
1706                 dtls1_buffer_message(s, 0);
1707                 }
1708
1709         /* SSL3_ST_SW_SESSION_TICKET_B */
1710         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1711         }
1712 #endif