PR: 1949
[openssl.git] / ssl / d1_clnt.c
1 /* ssl/d1_clnt.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 #ifndef OPENSSL_NO_KRB5
119 #include "kssl_lcl.h"
120 #endif
121 #include <openssl/buffer.h>
122 #include <openssl/rand.h>
123 #include <openssl/objects.h>
124 #include <openssl/evp.h>
125 #include <openssl/md5.h>
126 #include <openssl/bn.h>
127 #ifndef OPENSSL_NO_DH
128 #include <openssl/dh.h>
129 #endif
130
131 static const SSL_METHOD *dtls1_get_client_method(int ver);
132 static int dtls1_get_hello_verify(SSL *s);
133
134 static const SSL_METHOD *dtls1_get_client_method(int ver)
135         {
136         if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
137                 return(DTLSv1_client_method());
138         else
139                 return(NULL);
140         }
141
142 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
143                         ssl_undefined_function,
144                         dtls1_connect,
145                         dtls1_get_client_method)
146
147 int dtls1_connect(SSL *s)
148         {
149         BUF_MEM *buf=NULL;
150         unsigned long Time=(unsigned long)time(NULL);
151         void (*cb)(const SSL *ssl,int type,int val)=NULL;
152         int ret= -1;
153         int new_state,state,skip=0;;
154
155         RAND_add(&Time,sizeof(Time),0);
156         ERR_clear_error();
157         clear_sys_error();
158
159         if (s->info_callback != NULL)
160                 cb=s->info_callback;
161         else if (s->ctx->info_callback != NULL)
162                 cb=s->ctx->info_callback;
163         
164         s->in_handshake++;
165         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
166
167         for (;;)
168                 {
169                 state=s->state;
170
171                 switch(s->state)
172                         {
173                 case SSL_ST_RENEGOTIATE:
174                         s->new_session=1;
175                         s->state=SSL_ST_CONNECT;
176                         s->ctx->stats.sess_connect_renegotiate++;
177                         /* break */
178                 case SSL_ST_BEFORE:
179                 case SSL_ST_CONNECT:
180                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
181                 case SSL_ST_OK|SSL_ST_CONNECT:
182
183                         s->server=0;
184                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
185
186                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
187                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
188                                 {
189                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
190                                 ret = -1;
191                                 goto end;
192                                 }
193                                 
194                         /* s->version=SSL3_VERSION; */
195                         s->type=SSL_ST_CONNECT;
196
197                         if (s->init_buf == NULL)
198                                 {
199                                 if ((buf=BUF_MEM_new()) == NULL)
200                                         {
201                                         ret= -1;
202                                         goto end;
203                                         }
204                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
205                                         {
206                                         ret= -1;
207                                         goto end;
208                                         }
209                                 s->init_buf=buf;
210                                 buf=NULL;
211                                 }
212
213                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
214
215                         /* setup buffing BIO */
216                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
217
218                         /* don't push the buffering BIO quite yet */
219
220                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
221                         s->ctx->stats.sess_connect++;
222                         s->init_num=0;
223                         /* mark client_random uninitialized */
224                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
225                         s->d1->send_cookie = 0;
226                         s->hit = 0;
227                         break;
228
229                 case SSL3_ST_CW_CLNT_HELLO_A:
230                 case SSL3_ST_CW_CLNT_HELLO_B:
231
232                         s->shutdown=0;
233
234                         /* every DTLS ClientHello resets Finished MAC */
235                         ssl3_init_finished_mac(s);
236
237                         dtls1_start_timer(s);
238                         ret=dtls1_client_hello(s);
239                         if (ret <= 0) goto end;
240
241                         if ( s->d1->send_cookie)
242                                 {
243                                 s->state=SSL3_ST_CW_FLUSH;
244                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
245                                 }
246                         else
247                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
248
249                         s->init_num=0;
250
251                         /* turn on buffering for the next lot of output */
252                         if (s->bbio != s->wbio)
253                                 s->wbio=BIO_push(s->bbio,s->wbio);
254
255                         break;
256
257                 case SSL3_ST_CR_SRVR_HELLO_A:
258                 case SSL3_ST_CR_SRVR_HELLO_B:
259                         ret=ssl3_get_server_hello(s);
260                         if (ret <= 0) goto end;
261                         else
262                                 {
263                                 dtls1_stop_timer(s);
264                                 if (s->hit)
265                                         s->state=SSL3_ST_CR_FINISHED_A;
266                                 else
267                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
268                                 }
269                         s->init_num=0;
270                         break;
271
272                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
273                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
274
275                         ret = dtls1_get_hello_verify(s);
276                         if ( ret <= 0)
277                                 goto end;
278                         dtls1_stop_timer(s);
279                         if ( s->d1->send_cookie) /* start again, with a cookie */
280                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
281                         else
282                                 s->state = SSL3_ST_CR_CERT_A;
283                         s->init_num = 0;
284                         break;
285
286                 case SSL3_ST_CR_CERT_A:
287                 case SSL3_ST_CR_CERT_B:
288 #ifndef OPENSSL_NO_TLSEXT
289                         ret=ssl3_check_finished(s);
290                         if (ret <= 0) goto end;
291                         if (ret == 2)
292                                 {
293                                 s->hit = 1;
294                                 if (s->tlsext_ticket_expected)
295                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
296                                 else
297                                         s->state=SSL3_ST_CR_FINISHED_A;
298                                 s->init_num=0;
299                                 break;
300                                 }
301 #endif
302                         /* Check if it is anon DH or PSK */
303                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
304                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
305                                 {
306                                 ret=ssl3_get_server_certificate(s);
307                                 if (ret <= 0) goto end;
308 #ifndef OPENSSL_NO_TLSEXT
309                                 if (s->tlsext_status_expected)
310                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
311                                 else
312                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
313                                 }
314                         else
315                                 {
316                                 skip = 1;
317                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
318                                 }
319 #else
320                                 }
321                         else
322                                 skip=1;
323
324                         s->state=SSL3_ST_CR_KEY_EXCH_A;
325 #endif
326                         s->init_num=0;
327                         break;
328
329                 case SSL3_ST_CR_KEY_EXCH_A:
330                 case SSL3_ST_CR_KEY_EXCH_B:
331                         ret=ssl3_get_key_exchange(s);
332                         if (ret <= 0) goto end;
333                         s->state=SSL3_ST_CR_CERT_REQ_A;
334                         s->init_num=0;
335
336                         /* at this point we check that we have the
337                          * required stuff from the server */
338                         if (!ssl3_check_cert_and_algorithm(s))
339                                 {
340                                 ret= -1;
341                                 goto end;
342                                 }
343                         break;
344
345                 case SSL3_ST_CR_CERT_REQ_A:
346                 case SSL3_ST_CR_CERT_REQ_B:
347                         ret=ssl3_get_certificate_request(s);
348                         if (ret <= 0) goto end;
349                         s->state=SSL3_ST_CR_SRVR_DONE_A;
350                         s->init_num=0;
351                         break;
352
353                 case SSL3_ST_CR_SRVR_DONE_A:
354                 case SSL3_ST_CR_SRVR_DONE_B:
355                         ret=ssl3_get_server_done(s);
356                         if (ret <= 0) goto end;
357                         if (s->s3->tmp.cert_req)
358                                 s->state=SSL3_ST_CW_CERT_A;
359                         else
360                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
361                         s->init_num=0;
362
363                         break;
364
365                 case SSL3_ST_CW_CERT_A:
366                 case SSL3_ST_CW_CERT_B:
367                 case SSL3_ST_CW_CERT_C:
368                 case SSL3_ST_CW_CERT_D:
369                         dtls1_start_timer(s);
370                         ret=dtls1_send_client_certificate(s);
371                         if (ret <= 0) goto end;
372                         s->state=SSL3_ST_CW_KEY_EXCH_A;
373                         s->init_num=0;
374                         break;
375
376                 case SSL3_ST_CW_KEY_EXCH_A:
377                 case SSL3_ST_CW_KEY_EXCH_B:
378                         dtls1_start_timer(s);
379                         ret=dtls1_send_client_key_exchange(s);
380                         if (ret <= 0) goto end;
381                         /* EAY EAY EAY need to check for DH fix cert
382                          * sent back */
383                         /* For TLS, cert_req is set to 2, so a cert chain
384                          * of nothing is sent, but no verify packet is sent */
385                         if (s->s3->tmp.cert_req == 1)
386                                 {
387                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
388                                 }
389                         else
390                                 {
391                                 s->state=SSL3_ST_CW_CHANGE_A;
392                                 s->s3->change_cipher_spec=0;
393                                 }
394
395                         s->init_num=0;
396                         break;
397
398                 case SSL3_ST_CW_CERT_VRFY_A:
399                 case SSL3_ST_CW_CERT_VRFY_B:
400                         dtls1_start_timer(s);
401                         ret=dtls1_send_client_verify(s);
402                         if (ret <= 0) goto end;
403                         s->state=SSL3_ST_CW_CHANGE_A;
404                         s->init_num=0;
405                         s->s3->change_cipher_spec=0;
406                         break;
407
408                 case SSL3_ST_CW_CHANGE_A:
409                 case SSL3_ST_CW_CHANGE_B:
410                         dtls1_start_timer(s);
411                         ret=dtls1_send_change_cipher_spec(s,
412                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
413                         if (ret <= 0) goto end;
414                         s->state=SSL3_ST_CW_FINISHED_A;
415                         s->init_num=0;
416
417                         s->session->cipher=s->s3->tmp.new_cipher;
418 #ifdef OPENSSL_NO_COMP
419                         s->session->compress_meth=0;
420 #else
421                         if (s->s3->tmp.new_compression == NULL)
422                                 s->session->compress_meth=0;
423                         else
424                                 s->session->compress_meth=
425                                         s->s3->tmp.new_compression->id;
426 #endif
427                         if (!s->method->ssl3_enc->setup_key_block(s))
428                                 {
429                                 ret= -1;
430                                 goto end;
431                                 }
432
433                         if (!s->method->ssl3_enc->change_cipher_state(s,
434                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
435                                 {
436                                 ret= -1;
437                                 goto end;
438                                 }
439                         
440                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
441                         break;
442
443                 case SSL3_ST_CW_FINISHED_A:
444                 case SSL3_ST_CW_FINISHED_B:
445                         dtls1_start_timer(s);
446                         ret=dtls1_send_finished(s,
447                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
448                                 s->method->ssl3_enc->client_finished_label,
449                                 s->method->ssl3_enc->client_finished_label_len);
450                         if (ret <= 0) goto end;
451                         s->state=SSL3_ST_CW_FLUSH;
452
453                         /* clear flags */
454                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
455                         if (s->hit)
456                                 {
457                                 s->s3->tmp.next_state=SSL_ST_OK;
458                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
459                                         {
460                                         s->state=SSL_ST_OK;
461                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
462                                         s->s3->delay_buf_pop_ret=0;
463                                         }
464                                 }
465                         else
466                                 {
467 #ifndef OPENSSL_NO_TLSEXT
468                                 /* Allow NewSessionTicket if ticket expected */
469                                 if (s->tlsext_ticket_expected)
470                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
471                                 else
472 #endif
473                                 
474                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
475                                 }
476                         s->init_num=0;
477                         break;
478
479 #ifndef OPENSSL_NO_TLSEXT
480                 case SSL3_ST_CR_SESSION_TICKET_A:
481                 case SSL3_ST_CR_SESSION_TICKET_B:
482                         ret=ssl3_get_new_session_ticket(s);
483                         if (ret <= 0) goto end;
484                         s->state=SSL3_ST_CR_FINISHED_A;
485                         s->init_num=0;
486                 break;
487
488                 case SSL3_ST_CR_CERT_STATUS_A:
489                 case SSL3_ST_CR_CERT_STATUS_B:
490                         ret=ssl3_get_cert_status(s);
491                         if (ret <= 0) goto end;
492                         s->state=SSL3_ST_CR_KEY_EXCH_A;
493                         s->init_num=0;
494                 break;
495 #endif
496
497                 case SSL3_ST_CR_FINISHED_A:
498                 case SSL3_ST_CR_FINISHED_B:
499                         s->d1->change_cipher_spec_ok = 1;
500                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
501                                 SSL3_ST_CR_FINISHED_B);
502                         if (ret <= 0) goto end;
503                         dtls1_stop_timer(s);
504
505                         if (s->hit)
506                                 s->state=SSL3_ST_CW_CHANGE_A;
507                         else
508                                 s->state=SSL_ST_OK;
509                         s->init_num=0;
510                         break;
511
512                 case SSL3_ST_CW_FLUSH:
513                         s->rwstate=SSL_WRITING;
514                         if (BIO_flush(s->wbio) <= 0)
515                                 {
516                                 ret= -1;
517                                 goto end;
518                                 }
519                         s->rwstate=SSL_NOTHING;
520                         s->state=s->s3->tmp.next_state;
521                         break;
522
523                 case SSL_ST_OK:
524                         /* clean a few things up */
525                         ssl3_cleanup_key_block(s);
526
527 #if 0
528                         if (s->init_buf != NULL)
529                                 {
530                                 BUF_MEM_free(s->init_buf);
531                                 s->init_buf=NULL;
532                                 }
533 #endif
534
535                         /* If we are not 'joining' the last two packets,
536                          * remove the buffering now */
537                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
538                                 ssl_free_wbio_buffer(s);
539                         /* else do it later in ssl3_write */
540
541                         s->init_num=0;
542                         s->new_session=0;
543
544                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
545                         if (s->hit) s->ctx->stats.sess_hit++;
546
547                         ret=1;
548                         /* s->server=0; */
549                         s->handshake_func=dtls1_connect;
550                         s->ctx->stats.sess_connect_good++;
551
552                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
553
554                         /* done with handshaking */
555                         s->d1->handshake_read_seq  = 0;
556                         s->d1->next_handshake_write_seq = 0;
557                         goto end;
558                         /* break; */
559                         
560                 default:
561                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
562                         ret= -1;
563                         goto end;
564                         /* break; */
565                         }
566
567                 /* did we do anything */
568                 if (!s->s3->tmp.reuse_message && !skip)
569                         {
570                         if (s->debug)
571                                 {
572                                 if ((ret=BIO_flush(s->wbio)) <= 0)
573                                         goto end;
574                                 }
575
576                         if ((cb != NULL) && (s->state != state))
577                                 {
578                                 new_state=s->state;
579                                 s->state=state;
580                                 cb(s,SSL_CB_CONNECT_LOOP,1);
581                                 s->state=new_state;
582                                 }
583                         }
584                 skip=0;
585                 }
586 end:
587         s->in_handshake--;
588         if (buf != NULL)
589                 BUF_MEM_free(buf);
590         if (cb != NULL)
591                 cb(s,SSL_CB_CONNECT_EXIT,ret);
592         return(ret);
593         }
594
595 int dtls1_client_hello(SSL *s)
596         {
597         unsigned char *buf;
598         unsigned char *p,*d;
599         unsigned int i,j;
600         unsigned long Time,l;
601         SSL_COMP *comp;
602
603         buf=(unsigned char *)s->init_buf->data;
604         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
605                 {
606                 SSL_SESSION *sess = s->session;
607                 if ((s->session == NULL) ||
608                         (s->session->ssl_version != s->version) ||
609 #ifdef OPENSSL_NO_TLSEXT
610                         !sess->session_id_length ||
611 #else
612                         (!sess->session_id_length && !sess->tlsext_tick) ||
613 #endif
614                         (s->session->not_resumable))
615                         {
616                         if (!ssl_get_new_session(s,0))
617                                 goto err;
618                         }
619                 /* else use the pre-loaded session */
620
621                 p=s->s3->client_random;
622
623                 /* if client_random is initialized, reuse it, we are
624                  * required to use same upon reply to HelloVerify */
625                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
626                 if (i==sizeof(s->s3->client_random))
627                         {
628                         Time=(unsigned long)time(NULL); /* Time */
629                         l2n(Time,p);
630                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
631                         }
632
633                 /* Do the message type and length last */
634                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
635
636                 *(p++)=s->version>>8;
637                 *(p++)=s->version&0xff;
638                 s->client_version=s->version;
639
640                 /* Random stuff */
641                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
642                 p+=SSL3_RANDOM_SIZE;
643
644                 /* Session ID */
645                 if (s->new_session)
646                         i=0;
647                 else
648                         i=s->session->session_id_length;
649                 *(p++)=i;
650                 if (i != 0)
651                         {
652                         if (i > sizeof s->session->session_id)
653                                 {
654                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
655                                 goto err;
656                                 }
657                         memcpy(p,s->session->session_id,i);
658                         p+=i;
659                         }
660                 
661                 /* cookie stuff */
662                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
663                         {
664                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
665                         goto err;
666                         }
667                 *(p++) = s->d1->cookie_len;
668                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
669                 p += s->d1->cookie_len;
670
671                 /* Ciphers supported */
672                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
673                 if (i == 0)
674                         {
675                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
676                         goto err;
677                         }
678                 s2n(i,p);
679                 p+=i;
680
681                 /* COMPRESSION */
682                 if (s->ctx->comp_methods == NULL)
683                         j=0;
684                 else
685                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
686                 *(p++)=1+j;
687                 for (i=0; i<j; i++)
688                         {
689                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
690                         *(p++)=comp->id;
691                         }
692                 *(p++)=0; /* Add the NULL method */
693
694 #ifndef OPENSSL_NO_TLSEXT
695                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
696                         {
697                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
698                         goto err;
699                         }
700 #endif          
701
702                 l=(p-d);
703                 d=buf;
704
705                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
706
707                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
708                 /* number of bytes to write */
709                 s->init_num=p-buf;
710                 s->init_off=0;
711
712                 /* buffer the message to handle re-xmits */
713                 dtls1_buffer_message(s, 0);
714                 }
715
716         /* SSL3_ST_CW_CLNT_HELLO_B */
717         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
718 err:
719         return(-1);
720         }
721
722 static int dtls1_get_hello_verify(SSL *s)
723         {
724         int n, al, ok = 0;
725         unsigned char *data;
726         unsigned int cookie_len;
727
728         n=s->method->ssl_get_message(s,
729                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
730                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
731                 -1,
732                 s->max_cert_list,
733                 &ok);
734
735         if (!ok) return((int)n);
736
737         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
738                 {
739                 s->d1->send_cookie = 0;
740                 s->s3->tmp.reuse_message=1;
741                 return(1);
742                 }
743
744         data = (unsigned char *)s->init_msg;
745
746         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
747                 {
748                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
749                 s->version=(s->version&0xff00)|data[1];
750                 al = SSL_AD_PROTOCOL_VERSION;
751                 goto f_err;
752                 }
753         data+=2;
754
755         cookie_len = *(data++);
756         if ( cookie_len > sizeof(s->d1->cookie))
757                 {
758                 al=SSL_AD_ILLEGAL_PARAMETER;
759                 goto f_err;
760                 }
761
762         memcpy(s->d1->cookie, data, cookie_len);
763         s->d1->cookie_len = cookie_len;
764
765         s->d1->send_cookie = 1;
766         return 1;
767
768 f_err:
769         ssl3_send_alert(s, SSL3_AL_FATAL, al);
770         return -1;
771         }
772
773 int dtls1_send_client_key_exchange(SSL *s)
774         {
775         unsigned char *p,*d;
776         int n;
777         unsigned long alg_k;
778 #ifndef OPENSSL_NO_RSA
779         unsigned char *q;
780         EVP_PKEY *pkey=NULL;
781 #endif
782 #ifndef OPENSSL_NO_KRB5
783         KSSL_ERR kssl_err;
784 #endif /* OPENSSL_NO_KRB5 */
785 #ifndef OPENSSL_NO_ECDH
786         EC_KEY *clnt_ecdh = NULL;
787         const EC_POINT *srvr_ecpoint = NULL;
788         EVP_PKEY *srvr_pub_pkey = NULL;
789         unsigned char *encodedPoint = NULL;
790         int encoded_pt_len = 0;
791         BN_CTX * bn_ctx = NULL;
792 #endif
793
794         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
795                 {
796                 d=(unsigned char *)s->init_buf->data;
797                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
798                 
799                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
800
801                 /* Fool emacs indentation */
802                 if (0) {}
803 #ifndef OPENSSL_NO_RSA
804                 else if (alg_k & SSL_kRSA)
805                         {
806                         RSA *rsa;
807                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
808
809                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
810                                 rsa=s->session->sess_cert->peer_rsa_tmp;
811                         else
812                                 {
813                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
814                                 if ((pkey == NULL) ||
815                                         (pkey->type != EVP_PKEY_RSA) ||
816                                         (pkey->pkey.rsa == NULL))
817                                         {
818                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
819                                         goto err;
820                                         }
821                                 rsa=pkey->pkey.rsa;
822                                 EVP_PKEY_free(pkey);
823                                 }
824                                 
825                         tmp_buf[0]=s->client_version>>8;
826                         tmp_buf[1]=s->client_version&0xff;
827                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
828                                         goto err;
829
830                         s->session->master_key_length=sizeof tmp_buf;
831
832                         q=p;
833                         /* Fix buf for TLS and [incidentally] DTLS */
834                         if (s->version > SSL3_VERSION)
835                                 p+=2;
836                         n=RSA_public_encrypt(sizeof tmp_buf,
837                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
838 #ifdef PKCS1_CHECK
839                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
840                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
841 #endif
842                         if (n <= 0)
843                                 {
844                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
845                                 goto err;
846                                 }
847
848                         /* Fix buf for TLS and [incidentally] DTLS */
849                         if (s->version > SSL3_VERSION)
850                                 {
851                                 s2n(n,q);
852                                 n+=2;
853                                 }
854
855                         s->session->master_key_length=
856                                 s->method->ssl3_enc->generate_master_secret(s,
857                                         s->session->master_key,
858                                         tmp_buf,sizeof tmp_buf);
859                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
860                         }
861 #endif
862 #ifndef OPENSSL_NO_KRB5
863                 else if (alg_k & SSL_kKRB5)
864                         {
865                         krb5_error_code krb5rc;
866                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
867                         /*  krb5_data   krb5_ap_req;  */
868                         krb5_data       *enc_ticket;
869                         krb5_data       authenticator, *authp = NULL;
870                         EVP_CIPHER_CTX  ciph_ctx;
871                         const EVP_CIPHER *enc = NULL;
872                         unsigned char   iv[EVP_MAX_IV_LENGTH];
873                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
874                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
875                                                 + EVP_MAX_IV_LENGTH];
876                         int             padl, outl = sizeof(epms);
877
878                         EVP_CIPHER_CTX_init(&ciph_ctx);
879
880 #ifdef KSSL_DEBUG
881                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
882                                 alg_k, SSL_kKRB5);
883 #endif  /* KSSL_DEBUG */
884
885                         authp = NULL;
886 #ifdef KRB5SENDAUTH
887                         if (KRB5SENDAUTH)  authp = &authenticator;
888 #endif  /* KRB5SENDAUTH */
889
890                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
891                                 &kssl_err);
892                         enc = kssl_map_enc(kssl_ctx->enctype);
893                         if (enc == NULL)
894                             goto err;
895 #ifdef KSSL_DEBUG
896                         {
897                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
898                         if (krb5rc && kssl_err.text)
899                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
900                         }
901 #endif  /* KSSL_DEBUG */
902
903                         if (krb5rc)
904                                 {
905                                 ssl3_send_alert(s,SSL3_AL_FATAL,
906                                                 SSL_AD_HANDSHAKE_FAILURE);
907                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
908                                                 kssl_err.reason);
909                                 goto err;
910                                 }
911
912                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
913                         **  in place of RFC 2712 KerberosWrapper, as in:
914                         **
915                         **  Send ticket (copy to *p, set n = length)
916                         **  n = krb5_ap_req.length;
917                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
918                         **  if (krb5_ap_req.data)  
919                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
920                         **
921                         **  Now using real RFC 2712 KerberosWrapper
922                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
923                         **  Note: 2712 "opaque" types are here replaced
924                         **  with a 2-byte length followed by the value.
925                         **  Example:
926                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
927                         **  Where "xx xx" = length bytes.  Shown here with
928                         **  optional authenticator omitted.
929                         */
930
931                         /*  KerberosWrapper.Ticket              */
932                         s2n(enc_ticket->length,p);
933                         memcpy(p, enc_ticket->data, enc_ticket->length);
934                         p+= enc_ticket->length;
935                         n = enc_ticket->length + 2;
936
937                         /*  KerberosWrapper.Authenticator       */
938                         if (authp  &&  authp->length)  
939                                 {
940                                 s2n(authp->length,p);
941                                 memcpy(p, authp->data, authp->length);
942                                 p+= authp->length;
943                                 n+= authp->length + 2;
944                                 
945                                 free(authp->data);
946                                 authp->data = NULL;
947                                 authp->length = 0;
948                                 }
949                         else
950                                 {
951                                 s2n(0,p);/*  null authenticator length  */
952                                 n+=2;
953                                 }
954  
955                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
956                             goto err;
957
958                         /*  20010420 VRS.  Tried it this way; failed.
959                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
960                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
961                         **                              kssl_ctx->length);
962                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
963                         */
964
965                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
966                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
967                                 kssl_ctx->key,iv);
968                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
969                                 sizeof tmp_buf);
970                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
971                         outl += padl;
972                         if (outl > (int)sizeof epms)
973                                 {
974                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
975                                 goto err;
976                                 }
977                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
978
979                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
980                         s2n(outl,p);
981                         memcpy(p, epms, outl);
982                         p+=outl;
983                         n+=outl + 2;
984
985                         s->session->master_key_length=
986                                 s->method->ssl3_enc->generate_master_secret(s,
987                                         s->session->master_key,
988                                         tmp_buf, sizeof tmp_buf);
989
990                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
991                         OPENSSL_cleanse(epms, outl);
992                         }
993 #endif
994 #ifndef OPENSSL_NO_DH
995                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
996                         {
997                         DH *dh_srvr,*dh_clnt;
998
999                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1000                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1001                         else
1002                                 {
1003                                 /* we get them from the cert */
1004                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1005                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1006                                 goto err;
1007                                 }
1008                         
1009                         /* generate a new random key */
1010                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1011                                 {
1012                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1013                                 goto err;
1014                                 }
1015                         if (!DH_generate_key(dh_clnt))
1016                                 {
1017                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1018                                 goto err;
1019                                 }
1020
1021                         /* use the 'p' output buffer for the DH key, but
1022                          * make sure to clear it out afterwards */
1023
1024                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1025
1026                         if (n <= 0)
1027                                 {
1028                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1029                                 goto err;
1030                                 }
1031
1032                         /* generate master key from the result */
1033                         s->session->master_key_length=
1034                                 s->method->ssl3_enc->generate_master_secret(s,
1035                                         s->session->master_key,p,n);
1036                         /* clean up */
1037                         memset(p,0,n);
1038
1039                         /* send off the data */
1040                         n=BN_num_bytes(dh_clnt->pub_key);
1041                         s2n(n,p);
1042                         BN_bn2bin(dh_clnt->pub_key,p);
1043                         n+=2;
1044
1045                         DH_free(dh_clnt);
1046
1047                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1048                         }
1049 #endif
1050 #ifndef OPENSSL_NO_ECDH 
1051                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1052                         {
1053                         const EC_GROUP *srvr_group = NULL;
1054                         EC_KEY *tkey;
1055                         int ecdh_clnt_cert = 0;
1056                         int field_size = 0;
1057
1058                         /* Did we send out the client's
1059                          * ECDH share for use in premaster
1060                          * computation as part of client certificate?
1061                          * If so, set ecdh_clnt_cert to 1.
1062                          */
1063                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
1064                                 {
1065                                 /* XXX: For now, we do not support client
1066                                  * authentication using ECDH certificates.
1067                                  * To add such support, one needs to add
1068                                  * code that checks for appropriate 
1069                                  * conditions and sets ecdh_clnt_cert to 1.
1070                                  * For example, the cert have an ECC
1071                                  * key on the same curve as the server's
1072                                  * and the key should be authorized for
1073                                  * key agreement.
1074                                  *
1075                                  * One also needs to add code in ssl3_connect
1076                                  * to skip sending the certificate verify
1077                                  * message.
1078                                  *
1079                                  * if ((s->cert->key->privatekey != NULL) &&
1080                                  *     (s->cert->key->privatekey->type ==
1081                                  *      EVP_PKEY_EC) && ...)
1082                                  * ecdh_clnt_cert = 1;
1083                                  */
1084                                 }
1085
1086                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1087                                 {
1088                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1089                                 }
1090                         else
1091                                 {
1092                                 /* Get the Server Public Key from Cert */
1093                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1094                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1095                                 if ((srvr_pub_pkey == NULL) ||
1096                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1097                                     (srvr_pub_pkey->pkey.ec == NULL))
1098                                         {
1099                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1100                                             ERR_R_INTERNAL_ERROR);
1101                                         goto err;
1102                                         }
1103
1104                                 tkey = srvr_pub_pkey->pkey.ec;
1105                                 }
1106
1107                         srvr_group   = EC_KEY_get0_group(tkey);
1108                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1109
1110                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1111                                 {
1112                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1113                                     ERR_R_INTERNAL_ERROR);
1114                                 goto err;
1115                                 }
1116
1117                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
1118                                 {
1119                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1120                                 goto err;
1121                                 }
1122
1123                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1124                                 {
1125                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1126                                 goto err;
1127                                 }
1128                         if (ecdh_clnt_cert) 
1129                                 { 
1130                                 /* Reuse key info from our certificate
1131                                  * We only need our private key to perform
1132                                  * the ECDH computation.
1133                                  */
1134                                 const BIGNUM *priv_key;
1135                                 tkey = s->cert->key->privatekey->pkey.ec;
1136                                 priv_key = EC_KEY_get0_private_key(tkey);
1137                                 if (priv_key == NULL)
1138                                         {
1139                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1140                                         goto err;
1141                                         }
1142                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1143                                         {
1144                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1145                                         goto err;
1146                                         }
1147                                 }
1148                         else 
1149                                 {
1150                                 /* Generate a new ECDH key pair */
1151                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1152                                         {
1153                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1154                                         goto err;
1155                                         }
1156                                 }
1157
1158                         /* use the 'p' output buffer for the ECDH key, but
1159                          * make sure to clear it out afterwards
1160                          */
1161
1162                         field_size = EC_GROUP_get_degree(srvr_group);
1163                         if (field_size <= 0)
1164                                 {
1165                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 
1166                                        ERR_R_ECDH_LIB);
1167                                 goto err;
1168                                 }
1169                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1170                         if (n <= 0)
1171                                 {
1172                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 
1173                                        ERR_R_ECDH_LIB);
1174                                 goto err;
1175                                 }
1176
1177                         /* generate master key from the result */
1178                         s->session->master_key_length = s->method->ssl3_enc \
1179                             -> generate_master_secret(s, 
1180                                 s->session->master_key,
1181                                 p, n);
1182
1183                         memset(p, 0, n); /* clean up */
1184
1185                         if (ecdh_clnt_cert) 
1186                                 {
1187                                 /* Send empty client key exch message */
1188                                 n = 0;
1189                                 }
1190                         else 
1191                                 {
1192                                 /* First check the size of encoding and
1193                                  * allocate memory accordingly.
1194                                  */
1195                                 encoded_pt_len = 
1196                                     EC_POINT_point2oct(srvr_group, 
1197                                         EC_KEY_get0_public_key(clnt_ecdh), 
1198                                         POINT_CONVERSION_UNCOMPRESSED, 
1199                                         NULL, 0, NULL);
1200
1201                                 encodedPoint = (unsigned char *) 
1202                                     OPENSSL_malloc(encoded_pt_len * 
1203                                         sizeof(unsigned char)); 
1204                                 bn_ctx = BN_CTX_new();
1205                                 if ((encodedPoint == NULL) || 
1206                                     (bn_ctx == NULL)) 
1207                                         {
1208                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1209                                         goto err;
1210                                         }
1211
1212                                 /* Encode the public key */
1213                                 n = EC_POINT_point2oct(srvr_group, 
1214                                     EC_KEY_get0_public_key(clnt_ecdh), 
1215                                     POINT_CONVERSION_UNCOMPRESSED, 
1216                                     encodedPoint, encoded_pt_len, bn_ctx);
1217
1218                                 *p = n; /* length of encoded point */
1219                                 /* Encoded point will be copied here */
1220                                 p += 1; 
1221                                 /* copy the point */
1222                                 memcpy((unsigned char *)p, encodedPoint, n);
1223                                 /* increment n to account for length field */
1224                                 n += 1; 
1225                                 }
1226
1227                         /* Free allocated memory */
1228                         BN_CTX_free(bn_ctx);
1229                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1230                         if (clnt_ecdh != NULL) 
1231                                  EC_KEY_free(clnt_ecdh);
1232                         EVP_PKEY_free(srvr_pub_pkey);
1233                         }
1234 #endif /* !OPENSSL_NO_ECDH */
1235
1236 #ifndef OPENSSL_NO_PSK
1237                 else if (alg_k & SSL_kPSK)
1238                         {
1239                         char identity[PSK_MAX_IDENTITY_LEN];
1240                         unsigned char *t = NULL;
1241                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1242                         unsigned int pre_ms_len = 0, psk_len = 0;
1243                         int psk_err = 1;
1244
1245                         n = 0;
1246                         if (s->psk_client_callback == NULL)
1247                                 {
1248                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1249                                         SSL_R_PSK_NO_CLIENT_CB);
1250                                 goto err;
1251                                 }
1252
1253                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1254                                 identity, PSK_MAX_IDENTITY_LEN,
1255                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1256                         if (psk_len > PSK_MAX_PSK_LEN)
1257                                 {
1258                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1259                                         ERR_R_INTERNAL_ERROR);
1260                                 goto psk_err;
1261                                 }
1262                         else if (psk_len == 0)
1263                                 {
1264                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1265                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1266                                 goto psk_err;
1267                                 }
1268
1269                         /* create PSK pre_master_secret */
1270                         pre_ms_len = 2+psk_len+2+psk_len;
1271                         t = psk_or_pre_ms;
1272                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1273                         s2n(psk_len, t);
1274                         memset(t, 0, psk_len);
1275                         t+=psk_len;
1276                         s2n(psk_len, t);
1277
1278                         if (s->session->psk_identity_hint != NULL)
1279                                 OPENSSL_free(s->session->psk_identity_hint);
1280                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1281                         if (s->ctx->psk_identity_hint != NULL &&
1282                                 s->session->psk_identity_hint == NULL)
1283                                 {
1284                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1285                                         ERR_R_MALLOC_FAILURE);
1286                                 goto psk_err;
1287                                 }
1288
1289                         if (s->session->psk_identity != NULL)
1290                                 OPENSSL_free(s->session->psk_identity);
1291                         s->session->psk_identity = BUF_strdup(identity);
1292                         if (s->session->psk_identity == NULL)
1293                                 {
1294                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1295                                         ERR_R_MALLOC_FAILURE);
1296                                 goto psk_err;
1297                                 }
1298
1299                         s->session->master_key_length =
1300                                 s->method->ssl3_enc->generate_master_secret(s,
1301                                         s->session->master_key,
1302                                         psk_or_pre_ms, pre_ms_len); 
1303                         n = strlen(identity);
1304                         s2n(n, p);
1305                         memcpy(p, identity, n);
1306                         n+=2;
1307                         psk_err = 0;
1308                 psk_err:
1309                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1310                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1311                         if (psk_err != 0)
1312                                 {
1313                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1314                                 goto err;
1315                                 }
1316                         }
1317 #endif
1318                 else
1319                         {
1320                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1321                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1322                         goto err;
1323                         }
1324                 
1325                 d = dtls1_set_message_header(s, d,
1326                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1327                 /*
1328                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1329                  l2n3(n,d);
1330                  l2n(s->d1->handshake_write_seq,d);
1331                  s->d1->handshake_write_seq++;
1332                 */
1333                 
1334                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1335                 /* number of bytes to write */
1336                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1337                 s->init_off=0;
1338
1339                 /* buffer the message to handle re-xmits */
1340                 dtls1_buffer_message(s, 0);
1341                 }
1342         
1343         /* SSL3_ST_CW_KEY_EXCH_B */
1344         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1345 err:
1346 #ifndef OPENSSL_NO_ECDH
1347         BN_CTX_free(bn_ctx);
1348         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1349         if (clnt_ecdh != NULL) 
1350                 EC_KEY_free(clnt_ecdh);
1351         EVP_PKEY_free(srvr_pub_pkey);
1352 #endif
1353         return(-1);
1354         }
1355
1356 int dtls1_send_client_verify(SSL *s)
1357         {
1358         unsigned char *p,*d;
1359         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1360         EVP_PKEY *pkey;
1361 #ifndef OPENSSL_NO_RSA
1362         unsigned u=0;
1363 #endif
1364         unsigned long n;
1365 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1366         int j;
1367 #endif
1368
1369         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1370                 {
1371                 d=(unsigned char *)s->init_buf->data;
1372                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1373                 pkey=s->cert->key->privatekey;
1374
1375                 s->method->ssl3_enc->cert_verify_mac(s,
1376                 NID_sha1,
1377                         &(data[MD5_DIGEST_LENGTH]));
1378
1379 #ifndef OPENSSL_NO_RSA
1380                 if (pkey->type == EVP_PKEY_RSA)
1381                         {
1382                         s->method->ssl3_enc->cert_verify_mac(s,
1383                                 NID_md5,
1384                                 &(data[0]));
1385                         if (RSA_sign(NID_md5_sha1, data,
1386                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1387                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1388                                 {
1389                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1390                                 goto err;
1391                                 }
1392                         s2n(u,p);
1393                         n=u+2;
1394                         }
1395                 else
1396 #endif
1397 #ifndef OPENSSL_NO_DSA
1398                         if (pkey->type == EVP_PKEY_DSA)
1399                         {
1400                         if (!DSA_sign(pkey->save_type,
1401                                 &(data[MD5_DIGEST_LENGTH]),
1402                                 SHA_DIGEST_LENGTH,&(p[2]),
1403                                 (unsigned int *)&j,pkey->pkey.dsa))
1404                                 {
1405                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1406                                 goto err;
1407                                 }
1408                         s2n(j,p);
1409                         n=j+2;
1410                         }
1411                 else
1412 #endif
1413 #ifndef OPENSSL_NO_ECDSA
1414                         if (pkey->type == EVP_PKEY_EC)
1415                         {
1416                         if (!ECDSA_sign(pkey->save_type,
1417                                 &(data[MD5_DIGEST_LENGTH]),
1418                                 SHA_DIGEST_LENGTH,&(p[2]),
1419                                 (unsigned int *)&j,pkey->pkey.ec))
1420                                 {
1421                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1422                                     ERR_R_ECDSA_LIB);
1423                                 goto err;
1424                                 }
1425                         s2n(j,p);
1426                         n=j+2;
1427                         }
1428                 else
1429 #endif
1430                         {
1431                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1432                         goto err;
1433                         }
1434
1435                 d = dtls1_set_message_header(s, d,
1436                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1437
1438                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1439                 s->init_off=0;
1440
1441                 /* buffer the message to handle re-xmits */
1442                 dtls1_buffer_message(s, 0);
1443
1444                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1445                 }
1446
1447         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1448         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1449 err:
1450         return(-1);
1451         }
1452
1453 int dtls1_send_client_certificate(SSL *s)
1454         {
1455         X509 *x509=NULL;
1456         EVP_PKEY *pkey=NULL;
1457         int i;
1458         unsigned long l;
1459
1460         if (s->state == SSL3_ST_CW_CERT_A)
1461                 {
1462                 if ((s->cert == NULL) ||
1463                         (s->cert->key->x509 == NULL) ||
1464                         (s->cert->key->privatekey == NULL))
1465                         s->state=SSL3_ST_CW_CERT_B;
1466                 else
1467                         s->state=SSL3_ST_CW_CERT_C;
1468                 }
1469
1470         /* We need to get a client cert */
1471         if (s->state == SSL3_ST_CW_CERT_B)
1472                 {
1473                 /* If we get an error, we need to
1474                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1475                  * We then get retied later */
1476                 i=0;
1477                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1478                 if (i < 0)
1479                         {
1480                         s->rwstate=SSL_X509_LOOKUP;
1481                         return(-1);
1482                         }
1483                 s->rwstate=SSL_NOTHING;
1484                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1485                         {
1486                         s->state=SSL3_ST_CW_CERT_B;
1487                         if (    !SSL_use_certificate(s,x509) ||
1488                                 !SSL_use_PrivateKey(s,pkey))
1489                                 i=0;
1490                         }
1491                 else if (i == 1)
1492                         {
1493                         i=0;
1494                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1495                         }
1496
1497                 if (x509 != NULL) X509_free(x509);
1498                 if (pkey != NULL) EVP_PKEY_free(pkey);
1499                 if (i == 0)
1500                         {
1501                         if (s->version == SSL3_VERSION)
1502                                 {
1503                                 s->s3->tmp.cert_req=0;
1504                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1505                                 return(1);
1506                                 }
1507                         else
1508                                 {
1509                                 s->s3->tmp.cert_req=2;
1510                                 }
1511                         }
1512
1513                 /* Ok, we have a cert */
1514                 s->state=SSL3_ST_CW_CERT_C;
1515                 }
1516
1517         if (s->state == SSL3_ST_CW_CERT_C)
1518                 {
1519                 s->state=SSL3_ST_CW_CERT_D;
1520                 l=dtls1_output_cert_chain(s,
1521                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1522                 s->init_num=(int)l;
1523                 s->init_off=0;
1524
1525                 /* set header called by dtls1_output_cert_chain() */
1526
1527                 /* buffer the message to handle re-xmits */
1528                 dtls1_buffer_message(s, 0);
1529                 }
1530         /* SSL3_ST_CW_CERT_D */
1531         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1532         }
1533
1534