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Fix multiple vulnerabilities in OpenSSL. [SA-15:01]
[FreeBSD/releng/10.1.git] / crypto / openssl / 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_clear_record_buffer(s);
280                         dtls1_start_timer(s);
281                         ret=dtls1_send_hello_request(s);
282                         if (ret <= 0) goto end;
283                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
284                         s->state=SSL3_ST_SW_FLUSH;
285                         s->init_num=0;
286
287                         ssl3_init_finished_mac(s);
288                         break;
289
290                 case SSL3_ST_SW_HELLO_REQ_C:
291                         s->state=SSL_ST_OK;
292                         break;
293
294                 case SSL3_ST_SR_CLNT_HELLO_A:
295                 case SSL3_ST_SR_CLNT_HELLO_B:
296                 case SSL3_ST_SR_CLNT_HELLO_C:
297
298                         s->shutdown=0;
299                         ret=ssl3_get_client_hello(s);
300                         if (ret <= 0) goto end;
301                         dtls1_stop_timer(s);
302
303                         if (ret == 1 && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
304                                 s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A;
305                         else
306                                 s->state = SSL3_ST_SW_SRVR_HELLO_A;
307
308                         s->init_num=0;
309
310                         /* Reflect ClientHello sequence to remain stateless while listening */
311                         if (listen)
312                                 {
313                                 memcpy(s->s3->write_sequence, s->s3->read_sequence, sizeof(s->s3->write_sequence));
314                                 }
315
316                         /* If we're just listening, stop here */
317                         if (listen && s->state == SSL3_ST_SW_SRVR_HELLO_A)
318                                 {
319                                 ret = 2;
320                                 s->d1->listen = 0;
321                                 /* Set expected sequence numbers
322                                  * to continue the handshake.
323                                  */
324                                 s->d1->handshake_read_seq = 2;
325                                 s->d1->handshake_write_seq = 1;
326                                 s->d1->next_handshake_write_seq = 1;
327                                 goto end;
328                                 }
329                         
330                         break;
331                         
332                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A:
333                 case DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B:
334
335                         ret = dtls1_send_hello_verify_request(s);
336                         if ( ret <= 0) goto end;
337                         s->state=SSL3_ST_SW_FLUSH;
338                         s->s3->tmp.next_state=SSL3_ST_SR_CLNT_HELLO_A;
339
340                         /* HelloVerifyRequest resets Finished MAC */
341                         if (s->version != DTLS1_BAD_VER)
342                                 ssl3_init_finished_mac(s);
343                         break;
344                         
345 #ifndef OPENSSL_NO_SCTP
346                 case DTLS1_SCTP_ST_SR_READ_SOCK:
347                         
348                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))                
349                                 {
350                                 s->s3->in_read_app_data=2;
351                                 s->rwstate=SSL_READING;
352                                 BIO_clear_retry_flags(SSL_get_rbio(s));
353                                 BIO_set_retry_read(SSL_get_rbio(s));
354                                 ret = -1;
355                                 goto end;
356                                 }
357                         
358                         s->state=SSL3_ST_SR_FINISHED_A;
359                         break;
360                         
361                 case DTLS1_SCTP_ST_SW_WRITE_SOCK:
362                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
363                         if (ret < 0) goto end;
364                         
365                         if (ret == 0)
366                                 {
367                                 if (s->d1->next_state != SSL_ST_OK)
368                                         {
369                                         s->s3->in_read_app_data=2;
370                                         s->rwstate=SSL_READING;
371                                         BIO_clear_retry_flags(SSL_get_rbio(s));
372                                         BIO_set_retry_read(SSL_get_rbio(s));
373                                         ret = -1;
374                                         goto end;
375                                         }
376                                 }
377
378                         s->state=s->d1->next_state;
379                         break;
380 #endif
381
382                 case SSL3_ST_SW_SRVR_HELLO_A:
383                 case SSL3_ST_SW_SRVR_HELLO_B:
384                         s->renegotiate = 2;
385                         dtls1_start_timer(s);
386                         ret=dtls1_send_server_hello(s);
387                         if (ret <= 0) goto end;
388
389                         if (s->hit)
390                                 {
391 #ifndef OPENSSL_NO_SCTP
392                                 /* Add new shared key for SCTP-Auth,
393                                  * will be ignored if no SCTP used.
394                                  */
395                                 snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
396                                          DTLS1_SCTP_AUTH_LABEL);
397
398                                 SSL_export_keying_material(s, sctpauthkey,
399                                                            sizeof(sctpauthkey), labelbuffer,
400                                                            sizeof(labelbuffer), NULL, 0, 0);
401                                 
402                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
403                          sizeof(sctpauthkey), sctpauthkey);
404 #endif
405 #ifndef OPENSSL_NO_TLSEXT
406                                 if (s->tlsext_ticket_expected)
407                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
408                                 else
409                                         s->state=SSL3_ST_SW_CHANGE_A;
410 #else
411                                 s->state=SSL3_ST_SW_CHANGE_A;
412 #endif
413                                 }
414                         else
415                                 s->state=SSL3_ST_SW_CERT_A;
416                         s->init_num=0;
417                         break;
418
419                 case SSL3_ST_SW_CERT_A:
420                 case SSL3_ST_SW_CERT_B:
421                         /* Check if it is anon DH or normal PSK */
422                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
423                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
424                                 {
425                                 dtls1_start_timer(s);
426                                 ret=dtls1_send_server_certificate(s);
427                                 if (ret <= 0) goto end;
428 #ifndef OPENSSL_NO_TLSEXT
429                                 if (s->tlsext_status_expected)
430                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
431                                 else
432                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
433                                 }
434                         else
435                                 {
436                                 skip = 1;
437                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
438                                 }
439 #else
440                                 }
441                         else
442                                 skip=1;
443
444                         s->state=SSL3_ST_SW_KEY_EXCH_A;
445 #endif
446                         s->init_num=0;
447                         break;
448
449                 case SSL3_ST_SW_KEY_EXCH_A:
450                 case SSL3_ST_SW_KEY_EXCH_B:
451                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
452
453                         /*
454                          * clear this, it may get reset by
455                          * send_server_key_exchange
456                          */
457                         s->s3->tmp.use_rsa_tmp=0;
458
459                         /* only send if a DH key exchange or
460                          * RSA but we have a sign only certificate */
461                         if (0
462                         /* PSK: send ServerKeyExchange if PSK identity
463                          * hint if provided */
464 #ifndef OPENSSL_NO_PSK
465                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
466 #endif
467                             || (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
468                             || (alg_k & SSL_kEECDH)
469                             || ((alg_k & SSL_kRSA)
470                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
471                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
472                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
473                                         )
474                                     )
475                                 )
476                             )
477                                 {
478                                 dtls1_start_timer(s);
479                                 ret=dtls1_send_server_key_exchange(s);
480                                 if (ret <= 0) goto end;
481                                 }
482                         else
483                                 skip=1;
484
485                         s->state=SSL3_ST_SW_CERT_REQ_A;
486                         s->init_num=0;
487                         break;
488
489                 case SSL3_ST_SW_CERT_REQ_A:
490                 case SSL3_ST_SW_CERT_REQ_B:
491                         if (/* don't request cert unless asked for it: */
492                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
493                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
494                                  * don't request cert during re-negotiation: */
495                                 ((s->session->peer != NULL) &&
496                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
497                                 /* never request cert in anonymous ciphersuites
498                                  * (see section "Certificate request" in SSL 3 drafts
499                                  * and in RFC 2246): */
500                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
501                                  /* ... except when the application insists on verification
502                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
503                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
504                                  /* never request cert in Kerberos ciphersuites */
505                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
506                                 /* With normal PSK Certificates and
507                                  * Certificate Requests are omitted */
508                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
509                                 {
510                                 /* no cert request */
511                                 skip=1;
512                                 s->s3->tmp.cert_request=0;
513                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
514 #ifndef OPENSSL_NO_SCTP
515                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
516                                         {
517                                         s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
518                                         s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
519                                         }
520 #endif
521                                 }
522                         else
523                                 {
524                                 s->s3->tmp.cert_request=1;
525                                 dtls1_start_timer(s);
526                                 ret=dtls1_send_certificate_request(s);
527                                 if (ret <= 0) goto end;
528 #ifndef NETSCAPE_HANG_BUG
529                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
530 #ifndef OPENSSL_NO_SCTP
531                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
532                                         {
533                                         s->d1->next_state = SSL3_ST_SW_SRVR_DONE_A;
534                                         s->state = DTLS1_SCTP_ST_SW_WRITE_SOCK;
535                                         }
536 #endif
537 #else
538                                 s->state=SSL3_ST_SW_FLUSH;
539                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
540 #ifndef OPENSSL_NO_SCTP
541                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
542                                         {
543                                         s->d1->next_state = s->s3->tmp.next_state;
544                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
545                                         }
546 #endif
547 #endif
548                                 s->init_num=0;
549                                 }
550                         break;
551
552                 case SSL3_ST_SW_SRVR_DONE_A:
553                 case SSL3_ST_SW_SRVR_DONE_B:
554                         dtls1_start_timer(s);
555                         ret=dtls1_send_server_done(s);
556                         if (ret <= 0) goto end;
557                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
558                         s->state=SSL3_ST_SW_FLUSH;
559                         s->init_num=0;
560                         break;
561                 
562                 case SSL3_ST_SW_FLUSH:
563                         s->rwstate=SSL_WRITING;
564                         if (BIO_flush(s->wbio) <= 0)
565                                 {
566                                 /* If the write error was fatal, stop trying */
567                                 if (!BIO_should_retry(s->wbio))
568                                         {
569                                         s->rwstate=SSL_NOTHING;
570                                         s->state=s->s3->tmp.next_state;
571                                         }
572                                 
573                                 ret= -1;
574                                 goto end;
575                                 }
576                         s->rwstate=SSL_NOTHING;
577                         s->state=s->s3->tmp.next_state;
578                         break;
579
580                 case SSL3_ST_SR_CERT_A:
581                 case SSL3_ST_SR_CERT_B:
582                         /* Check for second client hello (MS SGC) */
583                         ret = ssl3_check_client_hello(s);
584                         if (ret <= 0)
585                                 goto end;
586                         if (ret == 2)
587                                 {
588                                 dtls1_stop_timer(s);
589                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
590                                 }
591                         else {
592                                 if (s->s3->tmp.cert_request)
593                                         {
594                                         ret=ssl3_get_client_certificate(s);
595                                         if (ret <= 0) goto end;
596                                         }
597                                 s->init_num=0;
598                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
599                         }
600                         break;
601
602                 case SSL3_ST_SR_KEY_EXCH_A:
603                 case SSL3_ST_SR_KEY_EXCH_B:
604                         ret=ssl3_get_client_key_exchange(s);
605                         if (ret <= 0) goto end;
606 #ifndef OPENSSL_NO_SCTP
607                         /* Add new shared key for SCTP-Auth,
608                          * will be ignored if no SCTP used.
609                          */
610                         snprintf((char *) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
611                                  DTLS1_SCTP_AUTH_LABEL);
612
613                         SSL_export_keying_material(s, sctpauthkey,
614                                                    sizeof(sctpauthkey), labelbuffer,
615                                                    sizeof(labelbuffer), NULL, 0, 0);
616
617                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
618                                  sizeof(sctpauthkey), sctpauthkey);
619 #endif
620
621                         s->state=SSL3_ST_SR_CERT_VRFY_A;
622                         s->init_num=0;
623
624                         if (ret == 2)
625                                 {
626                                 /* For the ECDH ciphersuites when
627                                  * the client sends its ECDH pub key in
628                                  * a certificate, the CertificateVerify
629                                  * message is not sent.
630                                  */
631                                 s->state=SSL3_ST_SR_FINISHED_A;
632                                 s->init_num = 0;
633                                 }
634                         else
635                                 {
636                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
637                                 s->init_num=0;
638
639                                 /* We need to get hashes here so if there is
640                                  * a client cert, it can be verified */ 
641                                 s->method->ssl3_enc->cert_verify_mac(s,
642                                         NID_md5,
643                                         &(s->s3->tmp.cert_verify_md[0]));
644                                 s->method->ssl3_enc->cert_verify_mac(s,
645                                         NID_sha1,
646                                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
647                                 }
648                         break;
649
650                 case SSL3_ST_SR_CERT_VRFY_A:
651                 case SSL3_ST_SR_CERT_VRFY_B:
652
653                         s->d1->change_cipher_spec_ok = 1;
654                         /* we should decide if we expected this one */
655                         ret=ssl3_get_cert_verify(s);
656                         if (ret <= 0) goto end;
657 #ifndef OPENSSL_NO_SCTP
658                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
659                             state == SSL_ST_RENEGOTIATE)
660                                 s->state=DTLS1_SCTP_ST_SR_READ_SOCK;
661                         else
662 #endif                  
663                                 s->state=SSL3_ST_SR_FINISHED_A;
664                         s->init_num=0;
665                         break;
666
667                 case SSL3_ST_SR_FINISHED_A:
668                 case SSL3_ST_SR_FINISHED_B:
669                         s->d1->change_cipher_spec_ok = 1;
670                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
671                                 SSL3_ST_SR_FINISHED_B);
672                         if (ret <= 0) goto end;
673                         dtls1_stop_timer(s);
674                         if (s->hit)
675                                 s->state=SSL_ST_OK;
676 #ifndef OPENSSL_NO_TLSEXT
677                         else if (s->tlsext_ticket_expected)
678                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
679 #endif
680                         else
681                                 s->state=SSL3_ST_SW_CHANGE_A;
682                         s->init_num=0;
683                         break;
684
685 #ifndef OPENSSL_NO_TLSEXT
686                 case SSL3_ST_SW_SESSION_TICKET_A:
687                 case SSL3_ST_SW_SESSION_TICKET_B:
688                         ret=dtls1_send_newsession_ticket(s);
689                         if (ret <= 0) goto end;
690                         s->state=SSL3_ST_SW_CHANGE_A;
691                         s->init_num=0;
692                         break;
693
694                 case SSL3_ST_SW_CERT_STATUS_A:
695                 case SSL3_ST_SW_CERT_STATUS_B:
696                         ret=ssl3_send_cert_status(s);
697                         if (ret <= 0) goto end;
698                         s->state=SSL3_ST_SW_KEY_EXCH_A;
699                         s->init_num=0;
700                         break;
701
702 #endif
703
704                 case SSL3_ST_SW_CHANGE_A:
705                 case SSL3_ST_SW_CHANGE_B:
706
707                         s->session->cipher=s->s3->tmp.new_cipher;
708                         if (!s->method->ssl3_enc->setup_key_block(s))
709                                 { ret= -1; goto end; }
710
711                         ret=dtls1_send_change_cipher_spec(s,
712                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
713
714                         if (ret <= 0) goto end;
715
716 #ifndef OPENSSL_NO_SCTP
717                         if (!s->hit)
718                                 {
719                                 /* Change to new shared key of SCTP-Auth,
720                                  * will be ignored if no SCTP used.
721                                  */
722                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
723                                 }
724 #endif
725
726                         s->state=SSL3_ST_SW_FINISHED_A;
727                         s->init_num=0;
728
729                         if (!s->method->ssl3_enc->change_cipher_state(s,
730                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
731                                 {
732                                 ret= -1;
733                                 goto end;
734                                 }
735
736                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
737                         break;
738
739                 case SSL3_ST_SW_FINISHED_A:
740                 case SSL3_ST_SW_FINISHED_B:
741                         ret=dtls1_send_finished(s,
742                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
743                                 s->method->ssl3_enc->server_finished_label,
744                                 s->method->ssl3_enc->server_finished_label_len);
745                         if (ret <= 0) goto end;
746                         s->state=SSL3_ST_SW_FLUSH;
747                         if (s->hit)
748                                 {
749                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
750
751 #ifndef OPENSSL_NO_SCTP
752                                 /* Change to new shared key of SCTP-Auth,
753                                  * will be ignored if no SCTP used.
754                                  */
755                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
756 #endif
757                                 }
758                         else
759                                 {
760                                 s->s3->tmp.next_state=SSL_ST_OK;
761 #ifndef OPENSSL_NO_SCTP
762                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
763                                         {
764                                         s->d1->next_state = s->s3->tmp.next_state;
765                                         s->s3->tmp.next_state=DTLS1_SCTP_ST_SW_WRITE_SOCK;
766                                         }
767 #endif
768                                 }
769                         s->init_num=0;
770                         break;
771
772                 case SSL_ST_OK:
773                         /* clean a few things up */
774                         ssl3_cleanup_key_block(s);
775
776 #if 0
777                         BUF_MEM_free(s->init_buf);
778                         s->init_buf=NULL;
779 #endif
780
781                         /* remove buffering on output */
782                         ssl_free_wbio_buffer(s);
783
784                         s->init_num=0;
785
786                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
787                                 {
788                                 s->renegotiate=0;
789                                 s->new_session=0;
790                                 
791                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
792                                 
793                                 s->ctx->stats.sess_accept_good++;
794                                 /* s->server=1; */
795                                 s->handshake_func=dtls1_accept;
796
797                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
798                                 }
799                         
800                         ret = 1;
801
802                         /* done handshaking, next message is client hello */
803                         s->d1->handshake_read_seq = 0;
804                         /* next message is server hello */
805                         s->d1->handshake_write_seq = 0;
806                         s->d1->next_handshake_write_seq = 0;
807                         goto end;
808                         /* break; */
809
810                 default:
811                         SSLerr(SSL_F_DTLS1_ACCEPT,SSL_R_UNKNOWN_STATE);
812                         ret= -1;
813                         goto end;
814                         /* break; */
815                         }
816                 
817                 if (!s->s3->tmp.reuse_message && !skip)
818                         {
819                         if (s->debug)
820                                 {
821                                 if ((ret=BIO_flush(s->wbio)) <= 0)
822                                         goto end;
823                                 }
824
825
826                         if ((cb != NULL) && (s->state != state))
827                                 {
828                                 new_state=s->state;
829                                 s->state=state;
830                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
831                                 s->state=new_state;
832                                 }
833                         }
834                 skip=0;
835                 }
836 end:
837         /* BIO_flush(s->wbio); */
838
839         s->in_handshake--;
840 #ifndef OPENSSL_NO_SCTP
841                 /* Notify SCTP BIO socket to leave handshake
842                  * mode and prevent stream identifier other
843                  * than 0. Will be ignored if no SCTP is used.
844                  */
845                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
846 #endif
847
848         if (cb != NULL)
849                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
850         return(ret);
851         }
852
853 int dtls1_send_hello_request(SSL *s)
854         {
855         unsigned char *p;
856
857         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
858                 {
859                 p=(unsigned char *)s->init_buf->data;
860                 p = dtls1_set_message_header(s, p, SSL3_MT_HELLO_REQUEST, 0, 0, 0);
861
862                 s->state=SSL3_ST_SW_HELLO_REQ_B;
863                 /* number of bytes to write */
864                 s->init_num=DTLS1_HM_HEADER_LENGTH;
865                 s->init_off=0;
866
867                 /* no need to buffer this message, since there are no retransmit 
868                  * requests for it */
869                 }
870
871         /* SSL3_ST_SW_HELLO_REQ_B */
872         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
873         }
874
875 int dtls1_send_hello_verify_request(SSL *s)
876         {
877         unsigned int msg_len;
878         unsigned char *msg, *buf, *p;
879
880         if (s->state == DTLS1_ST_SW_HELLO_VERIFY_REQUEST_A)
881                 {
882                 buf = (unsigned char *)s->init_buf->data;
883
884                 msg = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
885                 *(p++) = s->version >> 8;
886                 *(p++) = s->version & 0xFF;
887
888                 if (s->ctx->app_gen_cookie_cb == NULL ||
889                      s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
890                          &(s->d1->cookie_len)) == 0)
891                         {
892                         SSLerr(SSL_F_DTLS1_SEND_HELLO_VERIFY_REQUEST,ERR_R_INTERNAL_ERROR);
893                         return 0;
894                         }
895
896                 *(p++) = (unsigned char) s->d1->cookie_len;
897                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
898                 p += s->d1->cookie_len;
899                 msg_len = p - msg;
900
901                 dtls1_set_message_header(s, buf,
902                         DTLS1_MT_HELLO_VERIFY_REQUEST, msg_len, 0, msg_len);
903
904                 s->state=DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B;
905                 /* number of bytes to write */
906                 s->init_num=p-buf;
907                 s->init_off=0;
908                 }
909
910         /* s->state = DTLS1_ST_SW_HELLO_VERIFY_REQUEST_B */
911         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
912         }
913
914 int dtls1_send_server_hello(SSL *s)
915         {
916         unsigned char *buf;
917         unsigned char *p,*d;
918         int i;
919         unsigned int sl;
920         unsigned long l;
921
922         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
923                 {
924                 buf=(unsigned char *)s->init_buf->data;
925                 p=s->s3->server_random;
926                 ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE);
927                 /* Do the message type and length last */
928                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
929
930                 *(p++)=s->version>>8;
931                 *(p++)=s->version&0xff;
932
933                 /* Random stuff */
934                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
935                 p+=SSL3_RANDOM_SIZE;
936
937                 /* now in theory we have 3 options to sending back the
938                  * session id.  If it is a re-use, we send back the
939                  * old session-id, if it is a new session, we send
940                  * back the new session-id or we send back a 0 length
941                  * session-id if we want it to be single use.
942                  * Currently I will not implement the '0' length session-id
943                  * 12-Jan-98 - I'll now support the '0' length stuff.
944                  */
945                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
946                         s->session->session_id_length=0;
947
948                 sl=s->session->session_id_length;
949                 if (sl > sizeof s->session->session_id)
950                         {
951                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
952                         return -1;
953                         }
954                 *(p++)=sl;
955                 memcpy(p,s->session->session_id,sl);
956                 p+=sl;
957
958                 /* put the cipher */
959                 if (s->s3->tmp.new_cipher == NULL)
960                         return -1;
961                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
962                 p+=i;
963
964                 /* put the compression method */
965 #ifdef OPENSSL_NO_COMP
966                 *(p++)=0;
967 #else
968                 if (s->s3->tmp.new_compression == NULL)
969                         *(p++)=0;
970                 else
971                         *(p++)=s->s3->tmp.new_compression->id;
972 #endif
973
974 #ifndef OPENSSL_NO_TLSEXT
975                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
976                         {
977                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
978                         return -1;
979                         }
980                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
981                         {
982                         SSLerr(SSL_F_DTLS1_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
983                         return -1;
984                         }
985 #endif
986
987                 /* do the header */
988                 l=(p-d);
989                 d=buf;
990
991                 d = dtls1_set_message_header(s, d, SSL3_MT_SERVER_HELLO, l, 0, l);
992
993                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
994                 /* number of bytes to write */
995                 s->init_num=p-buf;
996                 s->init_off=0;
997
998                 /* buffer the message to handle re-xmits */
999                 dtls1_buffer_message(s, 0);
1000                 }
1001
1002         /* SSL3_ST_SW_SRVR_HELLO_B */
1003         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1004         }
1005
1006 int dtls1_send_server_done(SSL *s)
1007         {
1008         unsigned char *p;
1009
1010         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1011                 {
1012                 p=(unsigned char *)s->init_buf->data;
1013
1014                 /* do the header */
1015                 p = dtls1_set_message_header(s, p, SSL3_MT_SERVER_DONE, 0, 0, 0);
1016
1017                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1018                 /* number of bytes to write */
1019                 s->init_num=DTLS1_HM_HEADER_LENGTH;
1020                 s->init_off=0;
1021
1022                 /* buffer the message to handle re-xmits */
1023                 dtls1_buffer_message(s, 0);
1024                 }
1025
1026         /* SSL3_ST_SW_SRVR_DONE_B */
1027         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1028         }
1029
1030 int dtls1_send_server_key_exchange(SSL *s)
1031         {
1032 #ifndef OPENSSL_NO_RSA
1033         unsigned char *q;
1034         int j,num;
1035         RSA *rsa;
1036         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1037         unsigned int u;
1038 #endif
1039 #ifndef OPENSSL_NO_DH
1040         DH *dh=NULL,*dhp;
1041 #endif
1042 #ifndef OPENSSL_NO_ECDH
1043         EC_KEY *ecdh=NULL, *ecdhp;
1044         unsigned char *encodedPoint = NULL;
1045         int encodedlen = 0;
1046         int curve_id = 0;
1047         BN_CTX *bn_ctx = NULL; 
1048 #endif
1049         EVP_PKEY *pkey;
1050         unsigned char *p,*d;
1051         int al,i;
1052         unsigned long type;
1053         int n;
1054         CERT *cert;
1055         BIGNUM *r[4];
1056         int nr[4],kn;
1057         BUF_MEM *buf;
1058         EVP_MD_CTX md_ctx;
1059
1060         EVP_MD_CTX_init(&md_ctx);
1061         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1062                 {
1063                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1064                 cert=s->cert;
1065
1066                 buf=s->init_buf;
1067
1068                 r[0]=r[1]=r[2]=r[3]=NULL;
1069                 n=0;
1070 #ifndef OPENSSL_NO_RSA
1071                 if (type & SSL_kRSA)
1072                         {
1073                         rsa=cert->rsa_tmp;
1074                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1075                                 {
1076                                 rsa=s->cert->rsa_tmp_cb(s,
1077                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1078                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1079                                 if(rsa == NULL)
1080                                 {
1081                                         al=SSL_AD_HANDSHAKE_FAILURE;
1082                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1083                                         goto f_err;
1084                                 }
1085                                 RSA_up_ref(rsa);
1086                                 cert->rsa_tmp=rsa;
1087                                 }
1088                         if (rsa == NULL)
1089                                 {
1090                                 al=SSL_AD_HANDSHAKE_FAILURE;
1091                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1092                                 goto f_err;
1093                                 }
1094                         r[0]=rsa->n;
1095                         r[1]=rsa->e;
1096                         s->s3->tmp.use_rsa_tmp=1;
1097                         }
1098                 else
1099 #endif
1100 #ifndef OPENSSL_NO_DH
1101                         if (type & SSL_kEDH)
1102                         {
1103                         dhp=cert->dh_tmp;
1104                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1105                                 dhp=s->cert->dh_tmp_cb(s,
1106                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1107                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1108                         if (dhp == NULL)
1109                                 {
1110                                 al=SSL_AD_HANDSHAKE_FAILURE;
1111                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1112                                 goto f_err;
1113                                 }
1114
1115                         if (s->s3->tmp.dh != NULL)
1116                                 {
1117                                 DH_free(dh);
1118                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1119                                 goto err;
1120                                 }
1121
1122                         if ((dh=DHparams_dup(dhp)) == NULL)
1123                                 {
1124                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1125                                 goto err;
1126                                 }
1127
1128                         s->s3->tmp.dh=dh;
1129                         if ((dhp->pub_key == NULL ||
1130                              dhp->priv_key == NULL ||
1131                              (s->options & SSL_OP_SINGLE_DH_USE)))
1132                                 {
1133                                 if(!DH_generate_key(dh))
1134                                     {
1135                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,
1136                                            ERR_R_DH_LIB);
1137                                     goto err;
1138                                     }
1139                                 }
1140                         else
1141                                 {
1142                                 dh->pub_key=BN_dup(dhp->pub_key);
1143                                 dh->priv_key=BN_dup(dhp->priv_key);
1144                                 if ((dh->pub_key == NULL) ||
1145                                         (dh->priv_key == NULL))
1146                                         {
1147                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1148                                         goto err;
1149                                         }
1150                                 }
1151                         r[0]=dh->p;
1152                         r[1]=dh->g;
1153                         r[2]=dh->pub_key;
1154                         }
1155                 else 
1156 #endif
1157 #ifndef OPENSSL_NO_ECDH
1158                         if (type & SSL_kEECDH)
1159                         {
1160                         const EC_GROUP *group;
1161
1162                         ecdhp=cert->ecdh_tmp;
1163                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1164                                 {
1165                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1166                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1167                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1168                                 }
1169                         if (ecdhp == NULL)
1170                                 {
1171                                 al=SSL_AD_HANDSHAKE_FAILURE;
1172                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1173                                 goto f_err;
1174                                 }
1175
1176                         if (s->s3->tmp.ecdh != NULL)
1177                                 {
1178                                 EC_KEY_free(s->s3->tmp.ecdh); 
1179                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1180                                 goto err;
1181                                 }
1182
1183                         /* Duplicate the ECDH structure. */
1184                         if (ecdhp == NULL)
1185                                 {
1186                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1187                                 goto err;
1188                                 }
1189                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1190                                 {
1191                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1192                                 goto err;
1193                                 }
1194
1195                         s->s3->tmp.ecdh=ecdh;
1196                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1197                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1198                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1199                                 {
1200                                 if(!EC_KEY_generate_key(ecdh))
1201                                     {
1202                                     SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1203                                     goto err;
1204                                     }
1205                                 }
1206
1207                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1208                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1209                             (EC_KEY_get0_private_key(ecdh) == NULL))
1210                                 {
1211                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1212                                 goto err;
1213                                 }
1214
1215                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1216                             (EC_GROUP_get_degree(group) > 163)) 
1217                                 {
1218                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1219                                 goto err;
1220                                 }
1221
1222                         /* XXX: For now, we only support ephemeral ECDH
1223                          * keys over named (not generic) curves. For 
1224                          * supported named curves, curve_id is non-zero.
1225                          */
1226                         if ((curve_id = 
1227                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1228                             == 0)
1229                                 {
1230                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1231                                 goto err;
1232                                 }
1233
1234                         /* Encode the public key.
1235                          * First check the size of encoding and
1236                          * allocate memory accordingly.
1237                          */
1238                         encodedlen = EC_POINT_point2oct(group, 
1239                             EC_KEY_get0_public_key(ecdh),
1240                             POINT_CONVERSION_UNCOMPRESSED, 
1241                             NULL, 0, NULL);
1242
1243                         encodedPoint = (unsigned char *) 
1244                             OPENSSL_malloc(encodedlen*sizeof(unsigned char)); 
1245                         bn_ctx = BN_CTX_new();
1246                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1247                                 {
1248                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1249                                 goto err;
1250                                 }
1251
1252
1253                         encodedlen = EC_POINT_point2oct(group, 
1254                             EC_KEY_get0_public_key(ecdh), 
1255                             POINT_CONVERSION_UNCOMPRESSED, 
1256                             encodedPoint, encodedlen, bn_ctx);
1257
1258                         if (encodedlen == 0) 
1259                                 {
1260                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1261                                 goto err;
1262                                 }
1263
1264                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1265
1266                         /* XXX: For now, we only support named (not 
1267                          * generic) curves in ECDH ephemeral key exchanges.
1268                          * In this situation, we need four additional bytes
1269                          * to encode the entire ServerECDHParams
1270                          * structure. 
1271                          */
1272                         n = 4 + encodedlen;
1273
1274                         /* We'll generate the serverKeyExchange message
1275                          * explicitly so we can set these to NULLs
1276                          */
1277                         r[0]=NULL;
1278                         r[1]=NULL;
1279                         r[2]=NULL;
1280                         r[3]=NULL;
1281                         }
1282                 else 
1283 #endif /* !OPENSSL_NO_ECDH */
1284 #ifndef OPENSSL_NO_PSK
1285                         if (type & SSL_kPSK)
1286                                 {
1287                                 /* reserve size for record length and PSK identity hint*/
1288                                 n+=2+strlen(s->ctx->psk_identity_hint);
1289                                 }
1290                         else
1291 #endif /* !OPENSSL_NO_PSK */
1292                         {
1293                         al=SSL_AD_HANDSHAKE_FAILURE;
1294                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1295                         goto f_err;
1296                         }
1297                 for (i=0; r[i] != NULL; i++)
1298                         {
1299                         nr[i]=BN_num_bytes(r[i]);
1300                         n+=2+nr[i];
1301                         }
1302
1303                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1304                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1305                         {
1306                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher, NULL))
1307                                 == NULL)
1308                                 {
1309                                 al=SSL_AD_DECODE_ERROR;
1310                                 goto f_err;
1311                                 }
1312                         kn=EVP_PKEY_size(pkey);
1313                         }
1314                 else
1315                         {
1316                         pkey=NULL;
1317                         kn=0;
1318                         }
1319
1320                 if (!BUF_MEM_grow_clean(buf,n+DTLS1_HM_HEADER_LENGTH+kn))
1321                         {
1322                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1323                         goto err;
1324                         }
1325                 d=(unsigned char *)s->init_buf->data;
1326                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1327
1328                 for (i=0; r[i] != NULL; i++)
1329                         {
1330                         s2n(nr[i],p);
1331                         BN_bn2bin(r[i],p);
1332                         p+=nr[i];
1333                         }
1334
1335 #ifndef OPENSSL_NO_ECDH
1336                 if (type & SSL_kEECDH) 
1337                         {
1338                         /* XXX: For now, we only support named (not generic) curves.
1339                          * In this situation, the serverKeyExchange message has:
1340                          * [1 byte CurveType], [2 byte CurveName]
1341                          * [1 byte length of encoded point], followed by
1342                          * the actual encoded point itself
1343                          */
1344                         *p = NAMED_CURVE_TYPE;
1345                         p += 1;
1346                         *p = 0;
1347                         p += 1;
1348                         *p = curve_id;
1349                         p += 1;
1350                         *p = encodedlen;
1351                         p += 1;
1352                         memcpy((unsigned char*)p, 
1353                             (unsigned char *)encodedPoint, 
1354                             encodedlen);
1355                         OPENSSL_free(encodedPoint);
1356                         encodedPoint = NULL;
1357                         p += encodedlen;
1358                         }
1359 #endif
1360
1361 #ifndef OPENSSL_NO_PSK
1362                 if (type & SSL_kPSK)
1363                         {
1364                         /* copy PSK identity hint */
1365                         s2n(strlen(s->ctx->psk_identity_hint), p); 
1366                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1367                         p+=strlen(s->ctx->psk_identity_hint);
1368                         }
1369 #endif
1370
1371                 /* not anonymous */
1372                 if (pkey != NULL)
1373                         {
1374                         /* n is the length of the params, they start at
1375                          * &(d[DTLS1_HM_HEADER_LENGTH]) and p points to the space
1376                          * at the end. */
1377 #ifndef OPENSSL_NO_RSA
1378                         if (pkey->type == EVP_PKEY_RSA)
1379                                 {
1380                                 q=md_buf;
1381                                 j=0;
1382                                 for (num=2; num > 0; num--)
1383                                         {
1384                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1385                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1386                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1387                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1388                                         EVP_DigestUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1389                                         EVP_DigestFinal_ex(&md_ctx,q,
1390                                                 (unsigned int *)&i);
1391                                         q+=i;
1392                                         j+=i;
1393                                         }
1394                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1395                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1396                                         {
1397                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1398                                         goto err;
1399                                         }
1400                                 s2n(u,p);
1401                                 n+=u+2;
1402                                 }
1403                         else
1404 #endif
1405 #if !defined(OPENSSL_NO_DSA)
1406                                 if (pkey->type == EVP_PKEY_DSA)
1407                                 {
1408                                 /* lets do DSS */
1409                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1410                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1411                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1412                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1413                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1414                                         (unsigned int *)&i,pkey))
1415                                         {
1416                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1417                                         goto err;
1418                                         }
1419                                 s2n(i,p);
1420                                 n+=i+2;
1421                                 }
1422                         else
1423 #endif
1424 #if !defined(OPENSSL_NO_ECDSA)
1425                                 if (pkey->type == EVP_PKEY_EC)
1426                                 {
1427                                 /* let's do ECDSA */
1428                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1429                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1430                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1431                                 EVP_SignUpdate(&md_ctx,&(d[DTLS1_HM_HEADER_LENGTH]),n);
1432                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1433                                         (unsigned int *)&i,pkey))
1434                                         {
1435                                         SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1436                                         goto err;
1437                                         }
1438                                 s2n(i,p);
1439                                 n+=i+2;
1440                                 }
1441                         else
1442 #endif
1443                                 {
1444                                 /* Is this error check actually needed? */
1445                                 al=SSL_AD_HANDSHAKE_FAILURE;
1446                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1447                                 goto f_err;
1448                                 }
1449                         }
1450
1451                 d = dtls1_set_message_header(s, d,
1452                         SSL3_MT_SERVER_KEY_EXCHANGE, n, 0, n);
1453
1454                 /* we should now have things packed up, so lets send
1455                  * it off */
1456                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1457                 s->init_off=0;
1458
1459                 /* buffer the message to handle re-xmits */
1460                 dtls1_buffer_message(s, 0);
1461                 }
1462
1463         s->state = SSL3_ST_SW_KEY_EXCH_B;
1464         EVP_MD_CTX_cleanup(&md_ctx);
1465         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1466 f_err:
1467         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1468 err:
1469 #ifndef OPENSSL_NO_ECDH
1470         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1471         BN_CTX_free(bn_ctx);
1472 #endif
1473         EVP_MD_CTX_cleanup(&md_ctx);
1474         return(-1);
1475         }
1476
1477 int dtls1_send_certificate_request(SSL *s)
1478         {
1479         unsigned char *p,*d;
1480         int i,j,nl,off,n;
1481         STACK_OF(X509_NAME) *sk=NULL;
1482         X509_NAME *name;
1483         BUF_MEM *buf;
1484         unsigned int msg_len;
1485
1486         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1487                 {
1488                 buf=s->init_buf;
1489
1490                 d=p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH]);
1491
1492                 /* get the list of acceptable cert types */
1493                 p++;
1494                 n=ssl3_get_req_cert_type(s,p);
1495                 d[0]=n;
1496                 p+=n;
1497                 n++;
1498
1499                 off=n;
1500                 p+=2;
1501                 n+=2;
1502
1503                 sk=SSL_get_client_CA_list(s);
1504                 nl=0;
1505                 if (sk != NULL)
1506                         {
1507                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1508                                 {
1509                                 name=sk_X509_NAME_value(sk,i);
1510                                 j=i2d_X509_NAME(name,NULL);
1511                                 if (!BUF_MEM_grow_clean(buf,DTLS1_HM_HEADER_LENGTH+n+j+2))
1512                                         {
1513                                         SSLerr(SSL_F_DTLS1_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1514                                         goto err;
1515                                         }
1516                                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+n]);
1517                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1518                                         {
1519                                         s2n(j,p);
1520                                         i2d_X509_NAME(name,&p);
1521                                         n+=2+j;
1522                                         nl+=2+j;
1523                                         }
1524                                 else
1525                                         {
1526                                         d=p;
1527                                         i2d_X509_NAME(name,&p);
1528                                         j-=2; s2n(j,d); j+=2;
1529                                         n+=j;
1530                                         nl+=j;
1531                                         }
1532                                 }
1533                         }
1534                 /* else no CA names */
1535                 p=(unsigned char *)&(buf->data[DTLS1_HM_HEADER_LENGTH+off]);
1536                 s2n(nl,p);
1537
1538                 d=(unsigned char *)buf->data;
1539                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1540                 l2n3(n,d);
1541                 s2n(s->d1->handshake_write_seq,d);
1542                 s->d1->handshake_write_seq++;
1543
1544                 /* we should now have things packed up, so lets send
1545                  * it off */
1546
1547                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1548                 s->init_off=0;
1549 #ifdef NETSCAPE_HANG_BUG
1550 /* XXX: what to do about this? */
1551                 p=(unsigned char *)s->init_buf->data + s->init_num;
1552
1553                 /* do the header */
1554                 *(p++)=SSL3_MT_SERVER_DONE;
1555                 *(p++)=0;
1556                 *(p++)=0;
1557                 *(p++)=0;
1558                 s->init_num += 4;
1559 #endif
1560
1561                 /* XDTLS:  set message header ? */
1562                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1563                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1564                         SSL3_MT_CERTIFICATE_REQUEST, msg_len, 0, msg_len);
1565
1566                 /* buffer the message to handle re-xmits */
1567                 dtls1_buffer_message(s, 0);
1568
1569                 s->state = SSL3_ST_SW_CERT_REQ_B;
1570                 }
1571
1572         /* SSL3_ST_SW_CERT_REQ_B */
1573         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1574 err:
1575         return(-1);
1576         }
1577
1578 int dtls1_send_server_certificate(SSL *s)
1579         {
1580         unsigned long l;
1581         X509 *x;
1582
1583         if (s->state == SSL3_ST_SW_CERT_A)
1584                 {
1585                 x=ssl_get_server_send_cert(s);
1586                 if (x == NULL)
1587                         {
1588                         /* VRS: allow null cert if auth == KRB5 */
1589                         if ((s->s3->tmp.new_cipher->algorithm_mkey != SSL_kKRB5) ||
1590                             (s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5))
1591                                 {
1592                                 SSLerr(SSL_F_DTLS1_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
1593                                 return(0);
1594                                 }
1595                         }
1596
1597                 l=dtls1_output_cert_chain(s,x);
1598                 s->state=SSL3_ST_SW_CERT_B;
1599                 s->init_num=(int)l;
1600                 s->init_off=0;
1601
1602                 /* buffer the message to handle re-xmits */
1603                 dtls1_buffer_message(s, 0);
1604                 }
1605
1606         /* SSL3_ST_SW_CERT_B */
1607         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1608         }
1609
1610 #ifndef OPENSSL_NO_TLSEXT
1611 int dtls1_send_newsession_ticket(SSL *s)
1612         {
1613         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
1614                 {
1615                 unsigned char *p, *senc, *macstart;
1616                 int len, slen;
1617                 unsigned int hlen, msg_len;
1618                 EVP_CIPHER_CTX ctx;
1619                 HMAC_CTX hctx;
1620                 SSL_CTX *tctx = s->initial_ctx;
1621                 unsigned char iv[EVP_MAX_IV_LENGTH];
1622                 unsigned char key_name[16];
1623
1624                 /* get session encoding length */
1625                 slen = i2d_SSL_SESSION(s->session, NULL);
1626                 /* Some length values are 16 bits, so forget it if session is
1627                  * too long
1628                  */
1629                 if (slen > 0xFF00)
1630                         return -1;
1631                 /* Grow buffer if need be: the length calculation is as
1632                  * follows 12 (DTLS handshake message header) +
1633                  * 4 (ticket lifetime hint) + 2 (ticket length) +
1634                  * 16 (key name) + max_iv_len (iv length) +
1635                  * session_length + max_enc_block_size (max encrypted session
1636                  * length) + max_md_size (HMAC).
1637                  */
1638                 if (!BUF_MEM_grow(s->init_buf,
1639                         DTLS1_HM_HEADER_LENGTH + 22 + EVP_MAX_IV_LENGTH +
1640                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
1641                         return -1;
1642                 senc = OPENSSL_malloc(slen);
1643                 if (!senc)
1644                         return -1;
1645                 p = senc;
1646                 i2d_SSL_SESSION(s->session, &p);
1647
1648                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]);
1649                 EVP_CIPHER_CTX_init(&ctx);
1650                 HMAC_CTX_init(&hctx);
1651                 /* Initialize HMAC and cipher contexts. If callback present
1652                  * it does all the work otherwise use generated values
1653                  * from parent ctx.
1654                  */
1655                 if (tctx->tlsext_ticket_key_cb)
1656                         {
1657                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
1658                                                          &hctx, 1) < 0)
1659                                 {
1660                                 OPENSSL_free(senc);
1661                                 return -1;
1662                                 }
1663                         }
1664                 else
1665                         {
1666                         RAND_pseudo_bytes(iv, 16);
1667                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
1668                                         tctx->tlsext_tick_aes_key, iv);
1669                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
1670                                         tlsext_tick_md(), NULL);
1671                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
1672                         }
1673                 l2n(s->session->tlsext_tick_lifetime_hint, p);
1674                 /* Skip ticket length for now */
1675                 p += 2;
1676                 /* Output key name */
1677                 macstart = p;
1678                 memcpy(p, key_name, 16);
1679                 p += 16;
1680                 /* output IV */
1681                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
1682                 p += EVP_CIPHER_CTX_iv_length(&ctx);
1683                 /* Encrypt session data */
1684                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
1685                 p += len;
1686                 EVP_EncryptFinal(&ctx, p, &len);
1687                 p += len;
1688                 EVP_CIPHER_CTX_cleanup(&ctx);
1689
1690                 HMAC_Update(&hctx, macstart, p - macstart);
1691                 HMAC_Final(&hctx, p, &hlen);
1692                 HMAC_CTX_cleanup(&hctx);
1693
1694                 p += hlen;
1695                 /* Now write out lengths: p points to end of data written */
1696                 /* Total length */
1697                 len = p - (unsigned char *)(s->init_buf->data);
1698                 /* Ticket length */
1699                 p=(unsigned char *)&(s->init_buf->data[DTLS1_HM_HEADER_LENGTH]) + 4;
1700                 s2n(len - DTLS1_HM_HEADER_LENGTH - 6, p);
1701
1702                 /* number of bytes to write */
1703                 s->init_num= len;
1704                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
1705                 s->init_off=0;
1706                 OPENSSL_free(senc);
1707
1708                 /* XDTLS:  set message header ? */
1709                 msg_len = s->init_num - DTLS1_HM_HEADER_LENGTH;
1710                 dtls1_set_message_header(s, (void *)s->init_buf->data,
1711                         SSL3_MT_NEWSESSION_TICKET, msg_len, 0, msg_len);
1712
1713                 /* buffer the message to handle re-xmits */
1714                 dtls1_buffer_message(s, 0);
1715                 }
1716
1717         /* SSL3_ST_SW_SESSION_TICKET_B */
1718         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1719         }
1720 #endif