Additional comment changes for reformat of 1.0.1
[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 #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         s->in_handshake++;
169         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
170
171 #ifndef OPENSSL_NO_SCTP
172         /* Notify SCTP BIO socket to enter handshake
173          * mode and prevent stream identifier other
174          * than 0. Will be ignored if no SCTP is used.
175          */
176         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
177 #endif
178
179 #ifndef OPENSSL_NO_HEARTBEATS
180         /* If we're awaiting a HeartbeatResponse, pretend we
181          * already got and don't await it anymore, because
182          * Heartbeats don't make sense during handshakes anyway.
183          */
184         if (s->tlsext_hb_pending)
185                 {
186                 dtls1_stop_timer(s);
187                 s->tlsext_hb_pending = 0;
188                 s->tlsext_hb_seq++;
189                 }
190 #endif
191
192         for (;;)
193                 {
194                 state=s->state;
195
196                 switch(s->state)
197                         {
198                 case SSL_ST_RENEGOTIATE:
199                         s->renegotiate=1;
200                         s->state=SSL_ST_CONNECT;
201                         s->ctx->stats.sess_connect_renegotiate++;
202                         /* break */
203                 case SSL_ST_BEFORE:
204                 case SSL_ST_CONNECT:
205                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
206                 case SSL_ST_OK|SSL_ST_CONNECT:
207
208                         s->server=0;
209                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
210
211                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
212                             (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
213                                 {
214                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
215                                 ret = -1;
216                                 goto end;
217                                 }
218                                 
219                         /* s->version=SSL3_VERSION; */
220                         s->type=SSL_ST_CONNECT;
221
222                         if (s->init_buf == NULL)
223                                 {
224                                 if ((buf=BUF_MEM_new()) == NULL)
225                                         {
226                                         ret= -1;
227                                         goto end;
228                                         }
229                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
230                                         {
231                                         ret= -1;
232                                         goto end;
233                                         }
234                                 s->init_buf=buf;
235                                 buf=NULL;
236                                 }
237
238                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
239
240                         /* setup buffing BIO */
241                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
242
243                         /* don't push the buffering BIO quite yet */
244
245                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
246                         s->ctx->stats.sess_connect++;
247                         s->init_num=0;
248                         /* mark client_random uninitialized */
249                         memset(s->s3->client_random,0,sizeof(s->s3->client_random));
250                         s->d1->send_cookie = 0;
251                         s->hit = 0;
252                         s->d1->change_cipher_spec_ok = 0;
253                         /* Should have been reset by ssl3_get_finished, too. */
254                         s->s3->change_cipher_spec = 0;
255                         break;
256
257 #ifndef OPENSSL_NO_SCTP
258                 case DTLS1_SCTP_ST_CR_READ_SOCK:
259
260                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
261                         {
262                                 s->s3->in_read_app_data=2;
263                                 s->rwstate=SSL_READING;
264                                 BIO_clear_retry_flags(SSL_get_rbio(s));
265                                 BIO_set_retry_read(SSL_get_rbio(s));
266                                 ret = -1;
267                                 goto end;
268                         }
269
270                         s->state=s->s3->tmp.next_state;
271                         break;
272
273                 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
274                         /* read app data until dry event */
275
276                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
277                         if (ret < 0) goto end;
278
279                         if (ret == 0)
280                         {
281                                 s->s3->in_read_app_data=2;
282                                 s->rwstate=SSL_READING;
283                                 BIO_clear_retry_flags(SSL_get_rbio(s));
284                                 BIO_set_retry_read(SSL_get_rbio(s));
285                                 ret = -1;
286                                 goto end;
287                         }
288
289                         s->state=s->d1->next_state;
290                         break;
291 #endif
292
293                 case SSL3_ST_CW_CLNT_HELLO_A:
294                 case SSL3_ST_CW_CLNT_HELLO_B:
295
296                         s->shutdown=0;
297
298                         /* every DTLS ClientHello resets Finished MAC */
299                         ssl3_init_finished_mac(s);
300
301                         dtls1_start_timer(s);
302                         ret=dtls1_client_hello(s);
303                         if (ret <= 0) goto end;
304
305                         if ( s->d1->send_cookie)
306                                 {
307                                 s->state=SSL3_ST_CW_FLUSH;
308                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
309                                 }
310                         else
311                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
312
313                         s->init_num=0;
314
315 #ifndef OPENSSL_NO_SCTP
316                         /* Disable buffering for SCTP */
317                         if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
318                                 {
319 #endif
320                                 /* turn on buffering for the next lot of output */
321                                 if (s->bbio != s->wbio)
322                                         s->wbio=BIO_push(s->bbio,s->wbio);
323 #ifndef OPENSSL_NO_SCTP
324                                 }
325 #endif
326
327                         break;
328
329                 case SSL3_ST_CR_SRVR_HELLO_A:
330                 case SSL3_ST_CR_SRVR_HELLO_B:
331                         ret=ssl3_get_server_hello(s);
332                         if (ret <= 0) goto end;
333                         else
334                                 {
335                                 if (s->hit)
336                                         {
337 #ifndef OPENSSL_NO_SCTP
338                                         /* Add new shared key for SCTP-Auth,
339                                          * will be ignored if no SCTP used.
340                                          */
341                                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
342                                                  DTLS1_SCTP_AUTH_LABEL);
343
344                                         SSL_export_keying_material(s, sctpauthkey,
345                                                                    sizeof(sctpauthkey), labelbuffer,
346                                                                    sizeof(labelbuffer), NULL, 0, 0);
347
348                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
349                                                          sizeof(sctpauthkey), sctpauthkey);
350 #endif
351
352                                         s->state=SSL3_ST_CR_FINISHED_A;
353                                         }
354                                 else
355                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
356                                 }
357                         s->init_num=0;
358                         break;
359
360                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
361                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
362
363                         ret = dtls1_get_hello_verify(s);
364                         if ( ret <= 0)
365                                 goto end;
366                         dtls1_stop_timer(s);
367                         if ( s->d1->send_cookie) /* start again, with a cookie */
368                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
369                         else
370                                 s->state = SSL3_ST_CR_CERT_A;
371                         s->init_num = 0;
372                         break;
373
374                 case SSL3_ST_CR_CERT_A:
375                 case SSL3_ST_CR_CERT_B:
376                         /* Check if it is anon DH or PSK */
377                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
378                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
379                                 {
380                                 ret=ssl3_get_server_certificate(s);
381                                 if (ret <= 0) goto end;
382 #ifndef OPENSSL_NO_TLSEXT
383                                 if (s->tlsext_status_expected)
384                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
385                                 else
386                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
387                                 }
388                         else
389                                 {
390                                 skip = 1;
391                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
392                                 }
393 #else
394                                 }
395                         else
396                                 skip=1;
397
398                         s->state=SSL3_ST_CR_KEY_EXCH_A;
399 #endif
400                         s->init_num=0;
401                         break;
402
403                 case SSL3_ST_CR_KEY_EXCH_A:
404                 case SSL3_ST_CR_KEY_EXCH_B:
405                         ret=ssl3_get_key_exchange(s);
406                         if (ret <= 0) goto end;
407                         s->state=SSL3_ST_CR_CERT_REQ_A;
408                         s->init_num=0;
409
410                         /* at this point we check that we have the
411                          * required stuff from the server */
412                         if (!ssl3_check_cert_and_algorithm(s))
413                                 {
414                                 ret= -1;
415                                 goto end;
416                                 }
417                         break;
418
419                 case SSL3_ST_CR_CERT_REQ_A:
420                 case SSL3_ST_CR_CERT_REQ_B:
421                         ret=ssl3_get_certificate_request(s);
422                         if (ret <= 0) goto end;
423                         s->state=SSL3_ST_CR_SRVR_DONE_A;
424                         s->init_num=0;
425                         break;
426
427                 case SSL3_ST_CR_SRVR_DONE_A:
428                 case SSL3_ST_CR_SRVR_DONE_B:
429                         ret=ssl3_get_server_done(s);
430                         if (ret <= 0) goto end;
431                         dtls1_stop_timer(s);
432                         if (s->s3->tmp.cert_req)
433                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
434                         else
435                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
436                         s->init_num=0;
437
438 #ifndef OPENSSL_NO_SCTP                 
439                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
440                             state == SSL_ST_RENEGOTIATE)
441                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
442                         else
443 #endif                  
444                         s->state=s->s3->tmp.next_state;
445                         break;
446
447                 case SSL3_ST_CW_CERT_A:
448                 case SSL3_ST_CW_CERT_B:
449                 case SSL3_ST_CW_CERT_C:
450                 case SSL3_ST_CW_CERT_D:
451                         dtls1_start_timer(s);
452                         ret=dtls1_send_client_certificate(s);
453                         if (ret <= 0) goto end;
454                         s->state=SSL3_ST_CW_KEY_EXCH_A;
455                         s->init_num=0;
456                         break;
457
458                 case SSL3_ST_CW_KEY_EXCH_A:
459                 case SSL3_ST_CW_KEY_EXCH_B:
460                         dtls1_start_timer(s);
461                         ret=dtls1_send_client_key_exchange(s);
462                         if (ret <= 0) goto end;
463
464 #ifndef OPENSSL_NO_SCTP
465                         /* Add new shared key for SCTP-Auth,
466                          * will be ignored if no SCTP used.
467                          */
468                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
469                                  DTLS1_SCTP_AUTH_LABEL);
470
471                         SSL_export_keying_material(s, sctpauthkey,
472                                                    sizeof(sctpauthkey), labelbuffer,
473                                                    sizeof(labelbuffer), NULL, 0, 0);
474
475                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
476                                          sizeof(sctpauthkey), sctpauthkey);
477 #endif
478
479                         /* EAY EAY EAY need to check for DH fix cert
480                          * sent back */
481                         /* For TLS, cert_req is set to 2, so a cert chain
482                          * of nothing is sent, but no verify packet is sent */
483                         if (s->s3->tmp.cert_req == 1)
484                                 {
485                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
486                                 }
487                         else
488                                 {
489 #ifndef OPENSSL_NO_SCTP
490                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
491                                         {
492                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
493                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
494                                         }
495                                 else
496 #endif
497                                         s->state=SSL3_ST_CW_CHANGE_A;
498                                 }
499
500                         s->init_num=0;
501                         break;
502
503                 case SSL3_ST_CW_CERT_VRFY_A:
504                 case SSL3_ST_CW_CERT_VRFY_B:
505                         dtls1_start_timer(s);
506                         ret=dtls1_send_client_verify(s);
507                         if (ret <= 0) goto end;
508 #ifndef OPENSSL_NO_SCTP
509                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
510                         {
511                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
512                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
513                         }
514                         else
515 #endif
516                                 s->state=SSL3_ST_CW_CHANGE_A;
517                         s->init_num=0;
518                         break;
519
520                 case SSL3_ST_CW_CHANGE_A:
521                 case SSL3_ST_CW_CHANGE_B:
522                         if (!s->hit)
523                                 dtls1_start_timer(s);
524                         ret=dtls1_send_change_cipher_spec(s,
525                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
526                         if (ret <= 0) goto end;
527
528                         s->state=SSL3_ST_CW_FINISHED_A;
529                         s->init_num=0;
530
531                         s->session->cipher=s->s3->tmp.new_cipher;
532 #ifdef OPENSSL_NO_COMP
533                         s->session->compress_meth=0;
534 #else
535                         if (s->s3->tmp.new_compression == NULL)
536                                 s->session->compress_meth=0;
537                         else
538                                 s->session->compress_meth=
539                                         s->s3->tmp.new_compression->id;
540 #endif
541                         if (!s->method->ssl3_enc->setup_key_block(s))
542                                 {
543                                 ret= -1;
544                                 goto end;
545                                 }
546
547                         if (!s->method->ssl3_enc->change_cipher_state(s,
548                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
549                                 {
550                                 ret= -1;
551                                 goto end;
552                                 }
553                         
554 #ifndef OPENSSL_NO_SCTP
555                                 if (s->hit)
556                                         {
557                                         /* Change to new shared key of SCTP-Auth,
558                                          * will be ignored if no SCTP used.
559                                          */
560                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
561                                         }
562 #endif
563
564                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
565                         break;
566
567                 case SSL3_ST_CW_FINISHED_A:
568                 case SSL3_ST_CW_FINISHED_B:
569                         if (!s->hit)
570                                 dtls1_start_timer(s);
571                         ret=dtls1_send_finished(s,
572                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
573                                 s->method->ssl3_enc->client_finished_label,
574                                 s->method->ssl3_enc->client_finished_label_len);
575                         if (ret <= 0) goto end;
576                         s->state=SSL3_ST_CW_FLUSH;
577
578                         /* clear flags */
579                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
580                         if (s->hit)
581                                 {
582                                 s->s3->tmp.next_state=SSL_ST_OK;
583 #ifndef OPENSSL_NO_SCTP
584                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
585                                         {
586                                                 s->d1->next_state = s->s3->tmp.next_state;
587                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
588                                         }
589 #endif
590                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
591                                         {
592                                         s->state=SSL_ST_OK;
593 #ifndef OPENSSL_NO_SCTP
594                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
595                                                 {
596                                                         s->d1->next_state = SSL_ST_OK;
597                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
598                                                 }
599 #endif
600                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
601                                         s->s3->delay_buf_pop_ret=0;
602                                         }
603                                 }
604                         else
605                                 {
606 #ifndef OPENSSL_NO_SCTP
607                                 /* Change to new shared key of SCTP-Auth,
608                                  * will be ignored if no SCTP used.
609                                  */
610                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
611 #endif
612
613 #ifndef OPENSSL_NO_TLSEXT
614                                 /* Allow NewSessionTicket if ticket expected */
615                                 if (s->tlsext_ticket_expected)
616                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
617                                 else
618 #endif
619                                 
620                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
621                                 }
622                         s->init_num=0;
623                         break;
624
625 #ifndef OPENSSL_NO_TLSEXT
626                 case SSL3_ST_CR_SESSION_TICKET_A:
627                 case SSL3_ST_CR_SESSION_TICKET_B:
628                         ret=ssl3_get_new_session_ticket(s);
629                         if (ret <= 0) goto end;
630                         s->state=SSL3_ST_CR_FINISHED_A;
631                         s->init_num=0;
632                 break;
633
634                 case SSL3_ST_CR_CERT_STATUS_A:
635                 case SSL3_ST_CR_CERT_STATUS_B:
636                         ret=ssl3_get_cert_status(s);
637                         if (ret <= 0) goto end;
638                         s->state=SSL3_ST_CR_KEY_EXCH_A;
639                         s->init_num=0;
640                 break;
641 #endif
642
643                 case SSL3_ST_CR_FINISHED_A:
644                 case SSL3_ST_CR_FINISHED_B:
645                         s->d1->change_cipher_spec_ok = 1;
646                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
647                                 SSL3_ST_CR_FINISHED_B);
648                         if (ret <= 0) goto end;
649                         dtls1_stop_timer(s);
650
651                         if (s->hit)
652                                 s->state=SSL3_ST_CW_CHANGE_A;
653                         else
654                                 s->state=SSL_ST_OK;
655
656 #ifndef OPENSSL_NO_SCTP
657                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
658                                 state == SSL_ST_RENEGOTIATE)
659                                 {
660                                 s->d1->next_state=s->state;
661                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
662                                 }
663 #endif
664
665                         s->init_num=0;
666                         break;
667
668                 case SSL3_ST_CW_FLUSH:
669                         s->rwstate=SSL_WRITING;
670                         if (BIO_flush(s->wbio) <= 0)
671                                 {
672                                 /* If the write error was fatal, stop trying */
673                                 if (!BIO_should_retry(s->wbio))
674                                         {
675                                         s->rwstate=SSL_NOTHING;
676                                         s->state=s->s3->tmp.next_state;
677                                         }
678                                 
679                                 ret= -1;
680                                 goto end;
681                                 }
682                         s->rwstate=SSL_NOTHING;
683                         s->state=s->s3->tmp.next_state;
684                         break;
685
686                 case SSL_ST_OK:
687                         /* clean a few things up */
688                         ssl3_cleanup_key_block(s);
689
690 #if 0
691                         if (s->init_buf != NULL)
692                                 {
693                                 BUF_MEM_free(s->init_buf);
694                                 s->init_buf=NULL;
695                                 }
696 #endif
697
698                         /* If we are not 'joining' the last two packets,
699                          * remove the buffering now */
700                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
701                                 ssl_free_wbio_buffer(s);
702                         /* else do it later in ssl3_write */
703
704                         s->init_num=0;
705                         s->renegotiate=0;
706                         s->new_session=0;
707
708                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
709                         if (s->hit) s->ctx->stats.sess_hit++;
710
711                         ret=1;
712                         /* s->server=0; */
713                         s->handshake_func=dtls1_connect;
714                         s->ctx->stats.sess_connect_good++;
715
716                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
717
718                         /* done with handshaking */
719                         s->d1->handshake_read_seq  = 0;
720                         s->d1->next_handshake_write_seq = 0;
721                         goto end;
722                         /* break; */
723                         
724                 default:
725                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
726                         ret= -1;
727                         goto end;
728                         /* break; */
729                         }
730
731                 /* did we do anything */
732                 if (!s->s3->tmp.reuse_message && !skip)
733                         {
734                         if (s->debug)
735                                 {
736                                 if ((ret=BIO_flush(s->wbio)) <= 0)
737                                         goto end;
738                                 }
739
740                         if ((cb != NULL) && (s->state != state))
741                                 {
742                                 new_state=s->state;
743                                 s->state=state;
744                                 cb(s,SSL_CB_CONNECT_LOOP,1);
745                                 s->state=new_state;
746                                 }
747                         }
748                 skip=0;
749                 }
750 end:
751         s->in_handshake--;
752         
753 #ifndef OPENSSL_NO_SCTP
754         /* Notify SCTP BIO socket to leave handshake
755          * mode and allow stream identifier other
756          * than 0. Will be ignored if no SCTP is used.
757          */
758         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
759 #endif
760
761         if (buf != NULL)
762                 BUF_MEM_free(buf);
763         if (cb != NULL)
764                 cb(s,SSL_CB_CONNECT_EXIT,ret);
765         return(ret);
766         }
767
768 int dtls1_client_hello(SSL *s)
769         {
770         unsigned char *buf;
771         unsigned char *p,*d;
772         unsigned int i,j;
773         unsigned long l;
774         SSL_COMP *comp;
775
776         buf=(unsigned char *)s->init_buf->data;
777         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
778                 {
779                 SSL_SESSION *sess = s->session;
780                 if ((s->session == NULL) ||
781                         (s->session->ssl_version != s->version) ||
782 #ifdef OPENSSL_NO_TLSEXT
783                         !sess->session_id_length ||
784 #else
785                         (!sess->session_id_length && !sess->tlsext_tick) ||
786 #endif
787                         (s->session->not_resumable))
788                         {
789                         if (!ssl_get_new_session(s,0))
790                                 goto err;
791                         }
792                 /* else use the pre-loaded session */
793
794                 p=s->s3->client_random;
795
796                 /* if client_random is initialized, reuse it, we are
797                  * required to use same upon reply to HelloVerify */
798                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++)
799                         ;
800                 if (i==sizeof(s->s3->client_random))
801                         ssl_fill_hello_random(s, 0, p,
802                                               sizeof(s->s3->client_random));
803
804                 /* Do the message type and length last */
805                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
806
807                 *(p++)=s->version>>8;
808                 *(p++)=s->version&0xff;
809                 s->client_version=s->version;
810
811                 /* Random stuff */
812                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
813                 p+=SSL3_RANDOM_SIZE;
814
815                 /* Session ID */
816                 if (s->new_session)
817                         i=0;
818                 else
819                         i=s->session->session_id_length;
820                 *(p++)=i;
821                 if (i != 0)
822                         {
823                         if (i > sizeof s->session->session_id)
824                                 {
825                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
826                                 goto err;
827                                 }
828                         memcpy(p,s->session->session_id,i);
829                         p+=i;
830                         }
831                 
832                 /* cookie stuff */
833                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
834                         {
835                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
836                         goto err;
837                         }
838                 *(p++) = s->d1->cookie_len;
839                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
840                 p += s->d1->cookie_len;
841
842                 /* Ciphers supported */
843                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
844                 if (i == 0)
845                         {
846                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
847                         goto err;
848                         }
849                 s2n(i,p);
850                 p+=i;
851
852                 /* COMPRESSION */
853                 if (s->ctx->comp_methods == NULL)
854                         j=0;
855                 else
856                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
857                 *(p++)=1+j;
858                 for (i=0; i<j; i++)
859                         {
860                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
861                         *(p++)=comp->id;
862                         }
863                 *(p++)=0; /* Add the NULL method */
864
865 #ifndef OPENSSL_NO_TLSEXT
866                 /* TLS extensions*/
867                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
868                         {
869                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
870                         goto err;
871                         }
872                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
873                         {
874                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
875                         goto err;
876                         }
877 #endif
878
879                 l=(p-d);
880                 d=buf;
881
882                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
883
884                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
885                 /* number of bytes to write */
886                 s->init_num=p-buf;
887                 s->init_off=0;
888
889                 /* buffer the message to handle re-xmits */
890                 dtls1_buffer_message(s, 0);
891                 }
892
893         /* SSL3_ST_CW_CLNT_HELLO_B */
894         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
895 err:
896         return(-1);
897         }
898
899 static int dtls1_get_hello_verify(SSL *s)
900         {
901         int n, al, ok = 0;
902         unsigned char *data;
903         unsigned int cookie_len;
904
905         n=s->method->ssl_get_message(s,
906                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
907                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
908                 -1,
909                 s->max_cert_list,
910                 &ok);
911
912         if (!ok) return((int)n);
913
914         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
915                 {
916                 s->d1->send_cookie = 0;
917                 s->s3->tmp.reuse_message=1;
918                 return(1);
919                 }
920
921         data = (unsigned char *)s->init_msg;
922
923         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
924                 {
925                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
926                 s->version=(s->version&0xff00)|data[1];
927                 al = SSL_AD_PROTOCOL_VERSION;
928                 goto f_err;
929                 }
930         data+=2;
931
932         cookie_len = *(data++);
933         if ( cookie_len > sizeof(s->d1->cookie))
934                 {
935                 al=SSL_AD_ILLEGAL_PARAMETER;
936                 goto f_err;
937                 }
938
939         memcpy(s->d1->cookie, data, cookie_len);
940         s->d1->cookie_len = cookie_len;
941
942         s->d1->send_cookie = 1;
943         return 1;
944
945 f_err:
946         ssl3_send_alert(s, SSL3_AL_FATAL, al);
947         return -1;
948         }
949
950 int dtls1_send_client_key_exchange(SSL *s)
951         {
952         unsigned char *p,*d;
953         int n;
954         unsigned long alg_k;
955 #ifndef OPENSSL_NO_RSA
956         unsigned char *q;
957         EVP_PKEY *pkey=NULL;
958 #endif
959 #ifndef OPENSSL_NO_KRB5
960         KSSL_ERR kssl_err;
961 #endif /* OPENSSL_NO_KRB5 */
962 #ifndef OPENSSL_NO_ECDH
963         EC_KEY *clnt_ecdh = NULL;
964         const EC_POINT *srvr_ecpoint = NULL;
965         EVP_PKEY *srvr_pub_pkey = NULL;
966         unsigned char *encodedPoint = NULL;
967         int encoded_pt_len = 0;
968         BN_CTX * bn_ctx = NULL;
969 #endif
970
971         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
972                 {
973                 d=(unsigned char *)s->init_buf->data;
974                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
975                 
976                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
977
978                 /* Fool emacs indentation */
979                 if (0) {}
980 #ifndef OPENSSL_NO_RSA
981                 else if (alg_k & SSL_kRSA)
982                         {
983                         RSA *rsa;
984                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
985
986                         if (s->session->sess_cert == NULL)
987                                 {
988                                 /* We should always have a server certificate with SSL_kRSA. */
989                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
990                                 goto err;
991                                 }
992
993                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
994                                 rsa=s->session->sess_cert->peer_rsa_tmp;
995                         else
996                                 {
997                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
998                                 if ((pkey == NULL) ||
999                                         (pkey->type != EVP_PKEY_RSA) ||
1000                                         (pkey->pkey.rsa == NULL))
1001                                         {
1002                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1003                                         goto err;
1004                                         }
1005                                 rsa=pkey->pkey.rsa;
1006                                 EVP_PKEY_free(pkey);
1007                                 }
1008                                 
1009                         tmp_buf[0]=s->client_version>>8;
1010                         tmp_buf[1]=s->client_version&0xff;
1011                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1012                                         goto err;
1013
1014                         s->session->master_key_length=sizeof tmp_buf;
1015
1016                         q=p;
1017                         /* Fix buf for TLS and [incidentally] DTLS */
1018                         if (s->version > SSL3_VERSION)
1019                                 p+=2;
1020                         n=RSA_public_encrypt(sizeof tmp_buf,
1021                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1022 #ifdef PKCS1_CHECK
1023                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1024                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1025 #endif
1026                         if (n <= 0)
1027                                 {
1028                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1029                                 goto err;
1030                                 }
1031
1032                         /* Fix buf for TLS and [incidentally] DTLS */
1033                         if (s->version > SSL3_VERSION)
1034                                 {
1035                                 s2n(n,q);
1036                                 n+=2;
1037                                 }
1038
1039                         s->session->master_key_length=
1040                                 s->method->ssl3_enc->generate_master_secret(s,
1041                                         s->session->master_key,
1042                                         tmp_buf,sizeof tmp_buf);
1043                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1044                         }
1045 #endif
1046 #ifndef OPENSSL_NO_KRB5
1047                 else if (alg_k & SSL_kKRB5)
1048                         {
1049                         krb5_error_code krb5rc;
1050                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1051                         /*  krb5_data   krb5_ap_req;  */
1052                         krb5_data       *enc_ticket;
1053                         krb5_data       authenticator, *authp = NULL;
1054                         EVP_CIPHER_CTX  ciph_ctx;
1055                         const EVP_CIPHER *enc = NULL;
1056                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1057                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1058                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
1059                                                 + EVP_MAX_IV_LENGTH];
1060                         int             padl, outl = sizeof(epms);
1061
1062                         EVP_CIPHER_CTX_init(&ciph_ctx);
1063
1064 #ifdef KSSL_DEBUG
1065                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1066                                 alg_k, SSL_kKRB5);
1067 #endif  /* KSSL_DEBUG */
1068
1069                         authp = NULL;
1070 #ifdef KRB5SENDAUTH
1071                         if (KRB5SENDAUTH)  authp = &authenticator;
1072 #endif  /* KRB5SENDAUTH */
1073
1074                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1075                                 &kssl_err);
1076                         enc = kssl_map_enc(kssl_ctx->enctype);
1077                         if (enc == NULL)
1078                             goto err;
1079 #ifdef KSSL_DEBUG
1080                         {
1081                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1082                         if (krb5rc && kssl_err.text)
1083                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1084                         }
1085 #endif  /* KSSL_DEBUG */
1086
1087                         if (krb5rc)
1088                                 {
1089                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1090                                                 SSL_AD_HANDSHAKE_FAILURE);
1091                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1092                                                 kssl_err.reason);
1093                                 goto err;
1094                                 }
1095
1096                         /*-
1097                          *   20010406 VRS - Earlier versions used KRB5 AP_REQ
1098                         **  in place of RFC 2712 KerberosWrapper, as in:
1099                         **
1100                         **  Send ticket (copy to *p, set n = length)
1101                         **  n = krb5_ap_req.length;
1102                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1103                         **  if (krb5_ap_req.data)  
1104                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1105                         **
1106                         **  Now using real RFC 2712 KerberosWrapper
1107                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1108                         **  Note: 2712 "opaque" types are here replaced
1109                         **  with a 2-byte length followed by the value.
1110                         **  Example:
1111                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1112                         **  Where "xx xx" = length bytes.  Shown here with
1113                         **  optional authenticator omitted.
1114                         */
1115
1116                         /*  KerberosWrapper.Ticket              */
1117                         s2n(enc_ticket->length,p);
1118                         memcpy(p, enc_ticket->data, enc_ticket->length);
1119                         p+= enc_ticket->length;
1120                         n = enc_ticket->length + 2;
1121
1122                         /*  KerberosWrapper.Authenticator       */
1123                         if (authp  &&  authp->length)  
1124                                 {
1125                                 s2n(authp->length,p);
1126                                 memcpy(p, authp->data, authp->length);
1127                                 p+= authp->length;
1128                                 n+= authp->length + 2;
1129                                 
1130                                 free(authp->data);
1131                                 authp->data = NULL;
1132                                 authp->length = 0;
1133                                 }
1134                         else
1135                                 {
1136                                 s2n(0,p);/*  null authenticator length  */
1137                                 n+=2;
1138                                 }
1139  
1140                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1141                             goto err;
1142
1143                         /*-
1144                          *  20010420 VRS.  Tried it this way; failed.
1145                          *      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1146                          *      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1147                          *                              kssl_ctx->length);
1148                          *      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1149                          */
1150
1151                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1152                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1153                                 kssl_ctx->key,iv);
1154                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1155                                 sizeof tmp_buf);
1156                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1157                         outl += padl;
1158                         if (outl > (int)sizeof epms)
1159                                 {
1160                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1161                                 goto err;
1162                                 }
1163                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1164
1165                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1166                         s2n(outl,p);
1167                         memcpy(p, epms, outl);
1168                         p+=outl;
1169                         n+=outl + 2;
1170
1171                         s->session->master_key_length=
1172                                 s->method->ssl3_enc->generate_master_secret(s,
1173                                         s->session->master_key,
1174                                         tmp_buf, sizeof tmp_buf);
1175
1176                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1177                         OPENSSL_cleanse(epms, outl);
1178                         }
1179 #endif
1180 #ifndef OPENSSL_NO_DH
1181                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1182                         {
1183                         DH *dh_srvr,*dh_clnt;
1184
1185                         if (s->session->sess_cert == NULL)
1186                                 {
1187                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1188                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1189                                 goto err;
1190                                 }
1191
1192                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1193                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1194                         else
1195                                 {
1196                                 /* we get them from the cert */
1197                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1198                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1199                                 goto err;
1200                                 }
1201                         
1202                         /* generate a new random key */
1203                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1204                                 {
1205                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1206                                 goto err;
1207                                 }
1208                         if (!DH_generate_key(dh_clnt))
1209                                 {
1210                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1211                                 goto err;
1212                                 }
1213
1214                         /* use the 'p' output buffer for the DH key, but
1215                          * make sure to clear it out afterwards */
1216
1217                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1218
1219                         if (n <= 0)
1220                                 {
1221                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1222                                 goto err;
1223                                 }
1224
1225                         /* generate master key from the result */
1226                         s->session->master_key_length=
1227                                 s->method->ssl3_enc->generate_master_secret(s,
1228                                         s->session->master_key,p,n);
1229                         /* clean up */
1230                         memset(p,0,n);
1231
1232                         /* send off the data */
1233                         n=BN_num_bytes(dh_clnt->pub_key);
1234                         s2n(n,p);
1235                         BN_bn2bin(dh_clnt->pub_key,p);
1236                         n+=2;
1237
1238                         DH_free(dh_clnt);
1239
1240                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1241                         }
1242 #endif
1243 #ifndef OPENSSL_NO_ECDH 
1244                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1245                         {
1246                         const EC_GROUP *srvr_group = NULL;
1247                         EC_KEY *tkey;
1248                         int ecdh_clnt_cert = 0;
1249                         int field_size = 0;
1250
1251                         if (s->session->sess_cert == NULL)
1252                                 {
1253                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1254                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1255                                 goto err;
1256                                 }
1257
1258                         /* Did we send out the client's
1259                          * ECDH share for use in premaster
1260                          * computation as part of client certificate?
1261                          * If so, set ecdh_clnt_cert to 1.
1262                          */
1263                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
1264                                 {
1265                                 /* XXX: For now, we do not support client
1266                                  * authentication using ECDH certificates.
1267                                  * To add such support, one needs to add
1268                                  * code that checks for appropriate 
1269                                  * conditions and sets ecdh_clnt_cert to 1.
1270                                  * For example, the cert have an ECC
1271                                  * key on the same curve as the server's
1272                                  * and the key should be authorized for
1273                                  * key agreement.
1274                                  *
1275                                  * One also needs to add code in ssl3_connect
1276                                  * to skip sending the certificate verify
1277                                  * message.
1278                                  *
1279                                  * if ((s->cert->key->privatekey != NULL) &&
1280                                  *     (s->cert->key->privatekey->type ==
1281                                  *      EVP_PKEY_EC) && ...)
1282                                  * ecdh_clnt_cert = 1;
1283                                  */
1284                                 }
1285
1286                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1287                                 {
1288                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1289                                 }
1290                         else
1291                                 {
1292                                 /* Get the Server Public Key from Cert */
1293                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1294                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1295                                 if ((srvr_pub_pkey == NULL) ||
1296                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1297                                     (srvr_pub_pkey->pkey.ec == NULL))
1298                                         {
1299                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1300                                             ERR_R_INTERNAL_ERROR);
1301                                         goto err;
1302                                         }
1303
1304                                 tkey = srvr_pub_pkey->pkey.ec;
1305                                 }
1306
1307                         srvr_group   = EC_KEY_get0_group(tkey);
1308                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1309
1310                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1311                                 {
1312                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1313                                     ERR_R_INTERNAL_ERROR);
1314                                 goto err;
1315                                 }
1316
1317                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
1318                                 {
1319                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1320                                 goto err;
1321                                 }
1322
1323                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1324                                 {
1325                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1326                                 goto err;
1327                                 }
1328                         if (ecdh_clnt_cert) 
1329                                 { 
1330                                 /* Reuse key info from our certificate
1331                                  * We only need our private key to perform
1332                                  * the ECDH computation.
1333                                  */
1334                                 const BIGNUM *priv_key;
1335                                 tkey = s->cert->key->privatekey->pkey.ec;
1336                                 priv_key = EC_KEY_get0_private_key(tkey);
1337                                 if (priv_key == NULL)
1338                                         {
1339                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1340                                         goto err;
1341                                         }
1342                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1343                                         {
1344                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1345                                         goto err;
1346                                         }
1347                                 }
1348                         else 
1349                                 {
1350                                 /* Generate a new ECDH key pair */
1351                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1352                                         {
1353                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1354                                         goto err;
1355                                         }
1356                                 }
1357
1358                         /* use the 'p' output buffer for the ECDH key, but
1359                          * make sure to clear it out afterwards
1360                          */
1361
1362                         field_size = EC_GROUP_get_degree(srvr_group);
1363                         if (field_size <= 0)
1364                                 {
1365                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 
1366                                        ERR_R_ECDH_LIB);
1367                                 goto err;
1368                                 }
1369                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1370                         if (n <= 0)
1371                                 {
1372                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 
1373                                        ERR_R_ECDH_LIB);
1374                                 goto err;
1375                                 }
1376
1377                         /* generate master key from the result */
1378                         s->session->master_key_length = s->method->ssl3_enc \
1379                             -> generate_master_secret(s, 
1380                                 s->session->master_key,
1381                                 p, n);
1382
1383                         memset(p, 0, n); /* clean up */
1384
1385                         if (ecdh_clnt_cert) 
1386                                 {
1387                                 /* Send empty client key exch message */
1388                                 n = 0;
1389                                 }
1390                         else 
1391                                 {
1392                                 /* First check the size of encoding and
1393                                  * allocate memory accordingly.
1394                                  */
1395                                 encoded_pt_len = 
1396                                     EC_POINT_point2oct(srvr_group, 
1397                                         EC_KEY_get0_public_key(clnt_ecdh), 
1398                                         POINT_CONVERSION_UNCOMPRESSED, 
1399                                         NULL, 0, NULL);
1400
1401                                 encodedPoint = (unsigned char *) 
1402                                     OPENSSL_malloc(encoded_pt_len * 
1403                                         sizeof(unsigned char)); 
1404                                 bn_ctx = BN_CTX_new();
1405                                 if ((encodedPoint == NULL) || 
1406                                     (bn_ctx == NULL)) 
1407                                         {
1408                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1409                                         goto err;
1410                                         }
1411
1412                                 /* Encode the public key */
1413                                 n = EC_POINT_point2oct(srvr_group, 
1414                                     EC_KEY_get0_public_key(clnt_ecdh), 
1415                                     POINT_CONVERSION_UNCOMPRESSED, 
1416                                     encodedPoint, encoded_pt_len, bn_ctx);
1417
1418                                 *p = n; /* length of encoded point */
1419                                 /* Encoded point will be copied here */
1420                                 p += 1; 
1421                                 /* copy the point */
1422                                 memcpy((unsigned char *)p, encodedPoint, n);
1423                                 /* increment n to account for length field */
1424                                 n += 1; 
1425                                 }
1426
1427                         /* Free allocated memory */
1428                         BN_CTX_free(bn_ctx);
1429                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1430                         if (clnt_ecdh != NULL) 
1431                                  EC_KEY_free(clnt_ecdh);
1432                         EVP_PKEY_free(srvr_pub_pkey);
1433                         }
1434 #endif /* !OPENSSL_NO_ECDH */
1435
1436 #ifndef OPENSSL_NO_PSK
1437                 else if (alg_k & SSL_kPSK)
1438                         {
1439                         char identity[PSK_MAX_IDENTITY_LEN];
1440                         unsigned char *t = NULL;
1441                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1442                         unsigned int pre_ms_len = 0, psk_len = 0;
1443                         int psk_err = 1;
1444
1445                         n = 0;
1446                         if (s->psk_client_callback == NULL)
1447                                 {
1448                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1449                                         SSL_R_PSK_NO_CLIENT_CB);
1450                                 goto err;
1451                                 }
1452
1453                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1454                                 identity, PSK_MAX_IDENTITY_LEN,
1455                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1456                         if (psk_len > PSK_MAX_PSK_LEN)
1457                                 {
1458                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1459                                         ERR_R_INTERNAL_ERROR);
1460                                 goto psk_err;
1461                                 }
1462                         else if (psk_len == 0)
1463                                 {
1464                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1465                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1466                                 goto psk_err;
1467                                 }
1468
1469                         /* create PSK pre_master_secret */
1470                         pre_ms_len = 2+psk_len+2+psk_len;
1471                         t = psk_or_pre_ms;
1472                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1473                         s2n(psk_len, t);
1474                         memset(t, 0, psk_len);
1475                         t+=psk_len;
1476                         s2n(psk_len, t);
1477
1478                         if (s->session->psk_identity_hint != NULL)
1479                                 OPENSSL_free(s->session->psk_identity_hint);
1480                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1481                         if (s->ctx->psk_identity_hint != NULL &&
1482                                 s->session->psk_identity_hint == NULL)
1483                                 {
1484                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1485                                         ERR_R_MALLOC_FAILURE);
1486                                 goto psk_err;
1487                                 }
1488
1489                         if (s->session->psk_identity != NULL)
1490                                 OPENSSL_free(s->session->psk_identity);
1491                         s->session->psk_identity = BUF_strdup(identity);
1492                         if (s->session->psk_identity == NULL)
1493                                 {
1494                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1495                                         ERR_R_MALLOC_FAILURE);
1496                                 goto psk_err;
1497                                 }
1498
1499                         s->session->master_key_length =
1500                                 s->method->ssl3_enc->generate_master_secret(s,
1501                                         s->session->master_key,
1502                                         psk_or_pre_ms, pre_ms_len); 
1503                         n = strlen(identity);
1504                         s2n(n, p);
1505                         memcpy(p, identity, n);
1506                         n+=2;
1507                         psk_err = 0;
1508                 psk_err:
1509                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1510                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1511                         if (psk_err != 0)
1512                                 {
1513                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1514                                 goto err;
1515                                 }
1516                         }
1517 #endif
1518                 else
1519                         {
1520                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1521                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1522                         goto err;
1523                         }
1524                 
1525                 d = dtls1_set_message_header(s, d,
1526                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1527                 /*-
1528                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1529                  l2n3(n,d);
1530                  l2n(s->d1->handshake_write_seq,d);
1531                  s->d1->handshake_write_seq++;
1532                 */
1533                 
1534                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1535                 /* number of bytes to write */
1536                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1537                 s->init_off=0;
1538
1539                 /* buffer the message to handle re-xmits */
1540                 dtls1_buffer_message(s, 0);
1541                 }
1542         
1543         /* SSL3_ST_CW_KEY_EXCH_B */
1544         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1545 err:
1546 #ifndef OPENSSL_NO_ECDH
1547         BN_CTX_free(bn_ctx);
1548         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1549         if (clnt_ecdh != NULL) 
1550                 EC_KEY_free(clnt_ecdh);
1551         EVP_PKEY_free(srvr_pub_pkey);
1552 #endif
1553         return(-1);
1554         }
1555
1556 int dtls1_send_client_verify(SSL *s)
1557         {
1558         unsigned char *p,*d;
1559         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1560         EVP_PKEY *pkey;
1561 #ifndef OPENSSL_NO_RSA
1562         unsigned u=0;
1563 #endif
1564         unsigned long n;
1565 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1566         int j;
1567 #endif
1568
1569         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1570                 {
1571                 d=(unsigned char *)s->init_buf->data;
1572                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1573                 pkey=s->cert->key->privatekey;
1574
1575                 s->method->ssl3_enc->cert_verify_mac(s,
1576                 NID_sha1,
1577                         &(data[MD5_DIGEST_LENGTH]));
1578
1579 #ifndef OPENSSL_NO_RSA
1580                 if (pkey->type == EVP_PKEY_RSA)
1581                         {
1582                         s->method->ssl3_enc->cert_verify_mac(s,
1583                                 NID_md5,
1584                                 &(data[0]));
1585                         if (RSA_sign(NID_md5_sha1, data,
1586                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1587                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1588                                 {
1589                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1590                                 goto err;
1591                                 }
1592                         s2n(u,p);
1593                         n=u+2;
1594                         }
1595                 else
1596 #endif
1597 #ifndef OPENSSL_NO_DSA
1598                         if (pkey->type == EVP_PKEY_DSA)
1599                         {
1600                         if (!DSA_sign(pkey->save_type,
1601                                 &(data[MD5_DIGEST_LENGTH]),
1602                                 SHA_DIGEST_LENGTH,&(p[2]),
1603                                 (unsigned int *)&j,pkey->pkey.dsa))
1604                                 {
1605                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1606                                 goto err;
1607                                 }
1608                         s2n(j,p);
1609                         n=j+2;
1610                         }
1611                 else
1612 #endif
1613 #ifndef OPENSSL_NO_ECDSA
1614                         if (pkey->type == EVP_PKEY_EC)
1615                         {
1616                         if (!ECDSA_sign(pkey->save_type,
1617                                 &(data[MD5_DIGEST_LENGTH]),
1618                                 SHA_DIGEST_LENGTH,&(p[2]),
1619                                 (unsigned int *)&j,pkey->pkey.ec))
1620                                 {
1621                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1622                                     ERR_R_ECDSA_LIB);
1623                                 goto err;
1624                                 }
1625                         s2n(j,p);
1626                         n=j+2;
1627                         }
1628                 else
1629 #endif
1630                         {
1631                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1632                         goto err;
1633                         }
1634
1635                 d = dtls1_set_message_header(s, d,
1636                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1637
1638                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1639                 s->init_off=0;
1640
1641                 /* buffer the message to handle re-xmits */
1642                 dtls1_buffer_message(s, 0);
1643
1644                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1645                 }
1646
1647         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1648         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1649 err:
1650         return(-1);
1651         }
1652
1653 int dtls1_send_client_certificate(SSL *s)
1654         {
1655         X509 *x509=NULL;
1656         EVP_PKEY *pkey=NULL;
1657         int i;
1658         unsigned long l;
1659
1660         if (s->state == SSL3_ST_CW_CERT_A)
1661                 {
1662                 if ((s->cert == NULL) ||
1663                         (s->cert->key->x509 == NULL) ||
1664                         (s->cert->key->privatekey == NULL))
1665                         s->state=SSL3_ST_CW_CERT_B;
1666                 else
1667                         s->state=SSL3_ST_CW_CERT_C;
1668                 }
1669
1670         /* We need to get a client cert */
1671         if (s->state == SSL3_ST_CW_CERT_B)
1672                 {
1673                 /* If we get an error, we need to
1674                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1675                  * We then get retied later */
1676                 i=0;
1677                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1678                 if (i < 0)
1679                         {
1680                         s->rwstate=SSL_X509_LOOKUP;
1681                         return(-1);
1682                         }
1683                 s->rwstate=SSL_NOTHING;
1684                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1685                         {
1686                         s->state=SSL3_ST_CW_CERT_B;
1687                         if (    !SSL_use_certificate(s,x509) ||
1688                                 !SSL_use_PrivateKey(s,pkey))
1689                                 i=0;
1690                         }
1691                 else if (i == 1)
1692                         {
1693                         i=0;
1694                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1695                         }
1696
1697                 if (x509 != NULL) X509_free(x509);
1698                 if (pkey != NULL) EVP_PKEY_free(pkey);
1699                 if (i == 0)
1700                         {
1701                         if (s->version == SSL3_VERSION)
1702                                 {
1703                                 s->s3->tmp.cert_req=0;
1704                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1705                                 return(1);
1706                                 }
1707                         else
1708                                 {
1709                                 s->s3->tmp.cert_req=2;
1710                                 }
1711                         }
1712
1713                 /* Ok, we have a cert */
1714                 s->state=SSL3_ST_CW_CERT_C;
1715                 }
1716
1717         if (s->state == SSL3_ST_CW_CERT_C)
1718                 {
1719                 s->state=SSL3_ST_CW_CERT_D;
1720                 l=dtls1_output_cert_chain(s,
1721                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1722                 if (!l)
1723                         {
1724                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
1725                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
1726                         return 0;
1727                         }
1728                 s->init_num=(int)l;
1729                 s->init_off=0;
1730
1731                 /* set header called by dtls1_output_cert_chain() */
1732
1733                 /* buffer the message to handle re-xmits */
1734                 dtls1_buffer_message(s, 0);
1735                 }
1736         /* SSL3_ST_CW_CERT_D */
1737         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1738         }