reject zero length point format list or supported curves extensions
[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                         break;
253
254 #ifndef OPENSSL_NO_SCTP
255                 case DTLS1_SCTP_ST_CR_READ_SOCK:
256
257                         if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s)))
258                         {
259                                 s->s3->in_read_app_data=2;
260                                 s->rwstate=SSL_READING;
261                                 BIO_clear_retry_flags(SSL_get_rbio(s));
262                                 BIO_set_retry_read(SSL_get_rbio(s));
263                                 ret = -1;
264                                 goto end;
265                         }
266
267                         s->state=s->s3->tmp.next_state;
268                         break;
269
270                 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
271                         /* read app data until dry event */
272
273                         ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
274                         if (ret < 0) goto end;
275
276                         if (ret == 0)
277                         {
278                                 s->s3->in_read_app_data=2;
279                                 s->rwstate=SSL_READING;
280                                 BIO_clear_retry_flags(SSL_get_rbio(s));
281                                 BIO_set_retry_read(SSL_get_rbio(s));
282                                 ret = -1;
283                                 goto end;
284                         }
285
286                         s->state=s->d1->next_state;
287                         break;
288 #endif
289
290                 case SSL3_ST_CW_CLNT_HELLO_A:
291                 case SSL3_ST_CW_CLNT_HELLO_B:
292
293                         s->shutdown=0;
294
295                         /* every DTLS ClientHello resets Finished MAC */
296                         ssl3_init_finished_mac(s);
297
298                         dtls1_start_timer(s);
299                         ret=dtls1_client_hello(s);
300                         if (ret <= 0) goto end;
301
302                         if ( s->d1->send_cookie)
303                                 {
304                                 s->state=SSL3_ST_CW_FLUSH;
305                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
306                                 }
307                         else
308                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
309
310                         s->init_num=0;
311
312 #ifndef OPENSSL_NO_SCTP
313                         /* Disable buffering for SCTP */
314                         if (!BIO_dgram_is_sctp(SSL_get_wbio(s)))
315                                 {
316 #endif
317                                 /* turn on buffering for the next lot of output */
318                                 if (s->bbio != s->wbio)
319                                         s->wbio=BIO_push(s->bbio,s->wbio);
320 #ifndef OPENSSL_NO_SCTP
321                                 }
322 #endif
323
324                         break;
325
326                 case SSL3_ST_CR_SRVR_HELLO_A:
327                 case SSL3_ST_CR_SRVR_HELLO_B:
328                         ret=ssl3_get_server_hello(s);
329                         if (ret <= 0) goto end;
330                         else
331                                 {
332                                 if (s->hit)
333                                         {
334 #ifndef OPENSSL_NO_SCTP
335                                         /* Add new shared key for SCTP-Auth,
336                                          * will be ignored if no SCTP used.
337                                          */
338                                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
339                                                  DTLS1_SCTP_AUTH_LABEL);
340
341                                         SSL_export_keying_material(s, sctpauthkey,
342                                                                    sizeof(sctpauthkey), labelbuffer,
343                                                                    sizeof(labelbuffer), NULL, 0, 0);
344
345                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
346                                                          sizeof(sctpauthkey), sctpauthkey);
347 #endif
348
349                                         s->state=SSL3_ST_CR_FINISHED_A;
350                                         }
351                                 else
352                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
353                                 }
354                         s->init_num=0;
355                         break;
356
357                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
358                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
359
360                         ret = dtls1_get_hello_verify(s);
361                         if ( ret <= 0)
362                                 goto end;
363                         dtls1_stop_timer(s);
364                         if ( s->d1->send_cookie) /* start again, with a cookie */
365                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
366                         else
367                                 s->state = SSL3_ST_CR_CERT_A;
368                         s->init_num = 0;
369                         break;
370
371                 case SSL3_ST_CR_CERT_A:
372                 case SSL3_ST_CR_CERT_B:
373 #ifndef OPENSSL_NO_TLSEXT
374                         ret=ssl3_check_finished(s);
375                         if (ret <= 0) goto end;
376                         if (ret == 2)
377                                 {
378                                 s->hit = 1;
379                                 if (s->tlsext_ticket_expected)
380                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
381                                 else
382                                         s->state=SSL3_ST_CR_FINISHED_A;
383                                 s->init_num=0;
384                                 break;
385                                 }
386 #endif
387                         /* Check if it is anon DH or PSK */
388                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
389                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
390                                 {
391                                 ret=ssl3_get_server_certificate(s);
392                                 if (ret <= 0) goto end;
393 #ifndef OPENSSL_NO_TLSEXT
394                                 if (s->tlsext_status_expected)
395                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
396                                 else
397                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
398                                 }
399                         else
400                                 {
401                                 skip = 1;
402                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
403                                 }
404 #else
405                                 }
406                         else
407                                 skip=1;
408
409                         s->state=SSL3_ST_CR_KEY_EXCH_A;
410 #endif
411                         s->init_num=0;
412                         break;
413
414                 case SSL3_ST_CR_KEY_EXCH_A:
415                 case SSL3_ST_CR_KEY_EXCH_B:
416                         ret=ssl3_get_key_exchange(s);
417                         if (ret <= 0) goto end;
418                         s->state=SSL3_ST_CR_CERT_REQ_A;
419                         s->init_num=0;
420
421                         /* at this point we check that we have the
422                          * required stuff from the server */
423                         if (!ssl3_check_cert_and_algorithm(s))
424                                 {
425                                 ret= -1;
426                                 goto end;
427                                 }
428                         break;
429
430                 case SSL3_ST_CR_CERT_REQ_A:
431                 case SSL3_ST_CR_CERT_REQ_B:
432                         ret=ssl3_get_certificate_request(s);
433                         if (ret <= 0) goto end;
434                         s->state=SSL3_ST_CR_SRVR_DONE_A;
435                         s->init_num=0;
436                         break;
437
438                 case SSL3_ST_CR_SRVR_DONE_A:
439                 case SSL3_ST_CR_SRVR_DONE_B:
440                         ret=ssl3_get_server_done(s);
441                         if (ret <= 0) goto end;
442                         dtls1_stop_timer(s);
443                         if (s->s3->tmp.cert_req)
444                                 s->s3->tmp.next_state=SSL3_ST_CW_CERT_A;
445                         else
446                                 s->s3->tmp.next_state=SSL3_ST_CW_KEY_EXCH_A;
447                         s->init_num=0;
448
449 #ifndef OPENSSL_NO_SCTP                 
450                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
451                             state == SSL_ST_RENEGOTIATE)
452                                 s->state=DTLS1_SCTP_ST_CR_READ_SOCK;
453                         else
454 #endif                  
455                         s->state=s->s3->tmp.next_state;
456                         break;
457
458                 case SSL3_ST_CW_CERT_A:
459                 case SSL3_ST_CW_CERT_B:
460                 case SSL3_ST_CW_CERT_C:
461                 case SSL3_ST_CW_CERT_D:
462                         dtls1_start_timer(s);
463                         ret=dtls1_send_client_certificate(s);
464                         if (ret <= 0) goto end;
465                         s->state=SSL3_ST_CW_KEY_EXCH_A;
466                         s->init_num=0;
467                         break;
468
469                 case SSL3_ST_CW_KEY_EXCH_A:
470                 case SSL3_ST_CW_KEY_EXCH_B:
471                         dtls1_start_timer(s);
472                         ret=dtls1_send_client_key_exchange(s);
473                         if (ret <= 0) goto end;
474
475 #ifndef OPENSSL_NO_SCTP
476                         /* Add new shared key for SCTP-Auth,
477                          * will be ignored if no SCTP used.
478                          */
479                         snprintf((char*) labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
480                                  DTLS1_SCTP_AUTH_LABEL);
481
482                         SSL_export_keying_material(s, sctpauthkey,
483                                                    sizeof(sctpauthkey), labelbuffer,
484                                                    sizeof(labelbuffer), NULL, 0, 0);
485
486                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
487                                          sizeof(sctpauthkey), sctpauthkey);
488 #endif
489
490                         /* EAY EAY EAY need to check for DH fix cert
491                          * sent back */
492                         /* For TLS, cert_req is set to 2, so a cert chain
493                          * of nothing is sent, but no verify packet is sent */
494                         if (s->s3->tmp.cert_req == 1)
495                                 {
496                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
497                                 }
498                         else
499                                 {
500 #ifndef OPENSSL_NO_SCTP
501                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
502                                         {
503                                         s->d1->next_state=SSL3_ST_CW_CHANGE_A;
504                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
505                                         }
506                                 else
507 #endif
508                                         s->state=SSL3_ST_CW_CHANGE_A;
509                                 s->s3->change_cipher_spec=0;
510                                 }
511
512                         s->init_num=0;
513                         break;
514
515                 case SSL3_ST_CW_CERT_VRFY_A:
516                 case SSL3_ST_CW_CERT_VRFY_B:
517                         dtls1_start_timer(s);
518                         ret=dtls1_send_client_verify(s);
519                         if (ret <= 0) goto end;
520 #ifndef OPENSSL_NO_SCTP
521                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
522                         {
523                                 s->d1->next_state=SSL3_ST_CW_CHANGE_A;
524                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
525                         }
526                         else
527 #endif
528                                 s->state=SSL3_ST_CW_CHANGE_A;
529                         s->init_num=0;
530                         s->s3->change_cipher_spec=0;
531                         break;
532
533                 case SSL3_ST_CW_CHANGE_A:
534                 case SSL3_ST_CW_CHANGE_B:
535                         if (!s->hit)
536                                 dtls1_start_timer(s);
537                         ret=dtls1_send_change_cipher_spec(s,
538                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
539                         if (ret <= 0) goto end;
540
541 #ifndef OPENSSL_NO_SCTP
542                         /* Change to new shared key of SCTP-Auth,
543                          * will be ignored if no SCTP used.
544                          */
545                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
546 #endif
547
548                         s->state=SSL3_ST_CW_FINISHED_A;
549                         s->init_num=0;
550
551                         s->session->cipher=s->s3->tmp.new_cipher;
552 #ifdef OPENSSL_NO_COMP
553                         s->session->compress_meth=0;
554 #else
555                         if (s->s3->tmp.new_compression == NULL)
556                                 s->session->compress_meth=0;
557                         else
558                                 s->session->compress_meth=
559                                         s->s3->tmp.new_compression->id;
560 #endif
561                         if (!s->method->ssl3_enc->setup_key_block(s))
562                                 {
563                                 ret= -1;
564                                 goto end;
565                                 }
566
567                         if (!s->method->ssl3_enc->change_cipher_state(s,
568                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
569                                 {
570                                 ret= -1;
571                                 goto end;
572                                 }
573                         
574                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
575                         break;
576
577                 case SSL3_ST_CW_FINISHED_A:
578                 case SSL3_ST_CW_FINISHED_B:
579                         if (!s->hit)
580                                 dtls1_start_timer(s);
581                         ret=dtls1_send_finished(s,
582                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
583                                 s->method->ssl3_enc->client_finished_label,
584                                 s->method->ssl3_enc->client_finished_label_len);
585                         if (ret <= 0) goto end;
586                         s->state=SSL3_ST_CW_FLUSH;
587
588                         /* clear flags */
589                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
590                         if (s->hit)
591                                 {
592                                 s->s3->tmp.next_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 = s->s3->tmp.next_state;
597                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
598                                         }
599 #endif
600                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
601                                         {
602                                         s->state=SSL_ST_OK;
603 #ifndef OPENSSL_NO_SCTP
604                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
605                                                 {
606                                                         s->d1->next_state = SSL_ST_OK;
607                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
608                                                 }
609 #endif
610                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
611                                         s->s3->delay_buf_pop_ret=0;
612                                         }
613                                 }
614                         else
615                                 {
616 #ifndef OPENSSL_NO_TLSEXT
617                                 /* Allow NewSessionTicket if ticket expected */
618                                 if (s->tlsext_ticket_expected)
619                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
620                                 else
621 #endif
622                                 
623                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
624                                 }
625                         s->init_num=0;
626                         break;
627
628 #ifndef OPENSSL_NO_TLSEXT
629                 case SSL3_ST_CR_SESSION_TICKET_A:
630                 case SSL3_ST_CR_SESSION_TICKET_B:
631                         ret=ssl3_get_new_session_ticket(s);
632                         if (ret <= 0) goto end;
633                         s->state=SSL3_ST_CR_FINISHED_A;
634                         s->init_num=0;
635                 break;
636
637                 case SSL3_ST_CR_CERT_STATUS_A:
638                 case SSL3_ST_CR_CERT_STATUS_B:
639                         ret=ssl3_get_cert_status(s);
640                         if (ret <= 0) goto end;
641                         s->state=SSL3_ST_CR_KEY_EXCH_A;
642                         s->init_num=0;
643                 break;
644 #endif
645
646                 case SSL3_ST_CR_FINISHED_A:
647                 case SSL3_ST_CR_FINISHED_B:
648                         s->d1->change_cipher_spec_ok = 1;
649                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
650                                 SSL3_ST_CR_FINISHED_B);
651                         if (ret <= 0) goto end;
652                         dtls1_stop_timer(s);
653
654                         if (s->hit)
655                                 s->state=SSL3_ST_CW_CHANGE_A;
656                         else
657                                 s->state=SSL_ST_OK;
658
659 #ifndef OPENSSL_NO_SCTP
660                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
661                                 state == SSL_ST_RENEGOTIATE)
662                                 {
663                                 s->d1->next_state=s->state;
664                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
665                                 }
666 #endif
667
668                         s->init_num=0;
669                         break;
670
671                 case SSL3_ST_CW_FLUSH:
672                         s->rwstate=SSL_WRITING;
673                         if (BIO_flush(s->wbio) <= 0)
674                                 {
675                                 /* If the write error was fatal, stop trying */
676                                 if (!BIO_should_retry(s->wbio))
677                                         {
678                                         s->rwstate=SSL_NOTHING;
679                                         s->state=s->s3->tmp.next_state;
680                                         }
681                                 
682                                 ret= -1;
683                                 goto end;
684                                 }
685                         s->rwstate=SSL_NOTHING;
686                         s->state=s->s3->tmp.next_state;
687                         break;
688
689                 case SSL_ST_OK:
690                         /* clean a few things up */
691                         ssl3_cleanup_key_block(s);
692
693 #if 0
694                         if (s->init_buf != NULL)
695                                 {
696                                 BUF_MEM_free(s->init_buf);
697                                 s->init_buf=NULL;
698                                 }
699 #endif
700
701                         /* If we are not 'joining' the last two packets,
702                          * remove the buffering now */
703                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
704                                 ssl_free_wbio_buffer(s);
705                         /* else do it later in ssl3_write */
706
707                         s->init_num=0;
708                         s->renegotiate=0;
709                         s->new_session=0;
710
711                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
712                         if (s->hit) s->ctx->stats.sess_hit++;
713
714                         ret=1;
715                         /* s->server=0; */
716                         s->handshake_func=dtls1_connect;
717                         s->ctx->stats.sess_connect_good++;
718
719                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
720
721                         /* done with handshaking */
722                         s->d1->handshake_read_seq  = 0;
723                         s->d1->next_handshake_write_seq = 0;
724                         goto end;
725                         /* break; */
726                         
727                 default:
728                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
729                         ret= -1;
730                         goto end;
731                         /* break; */
732                         }
733
734                 /* did we do anything */
735                 if (!s->s3->tmp.reuse_message && !skip)
736                         {
737                         if (s->debug)
738                                 {
739                                 if ((ret=BIO_flush(s->wbio)) <= 0)
740                                         goto end;
741                                 }
742
743                         if ((cb != NULL) && (s->state != state))
744                                 {
745                                 new_state=s->state;
746                                 s->state=state;
747                                 cb(s,SSL_CB_CONNECT_LOOP,1);
748                                 s->state=new_state;
749                                 }
750                         }
751                 skip=0;
752                 }
753 end:
754         s->in_handshake--;
755         
756 #ifndef OPENSSL_NO_SCTP
757         /* Notify SCTP BIO socket to leave handshake
758          * mode and allow stream identifier other
759          * than 0. Will be ignored if no SCTP is used.
760          */
761         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
762 #endif
763
764         if (buf != NULL)
765                 BUF_MEM_free(buf);
766         if (cb != NULL)
767                 cb(s,SSL_CB_CONNECT_EXIT,ret);
768         return(ret);
769         }
770
771 int dtls1_client_hello(SSL *s)
772         {
773         unsigned char *buf;
774         unsigned char *p,*d;
775         unsigned int i,j;
776         unsigned long Time,l;
777         SSL_COMP *comp;
778
779         buf=(unsigned char *)s->init_buf->data;
780         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
781                 {
782                 SSL_SESSION *sess = s->session;
783                 if ((s->session == NULL) ||
784                         (s->session->ssl_version != s->version) ||
785 #ifdef OPENSSL_NO_TLSEXT
786                         !sess->session_id_length ||
787 #else
788                         (!sess->session_id_length && !sess->tlsext_tick) ||
789 #endif
790                         (s->session->not_resumable))
791                         {
792                         if (!ssl_get_new_session(s,0))
793                                 goto err;
794                         }
795                 /* else use the pre-loaded session */
796
797                 p=s->s3->client_random;
798
799                 /* if client_random is initialized, reuse it, we are
800                  * required to use same upon reply to HelloVerify */
801                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
802                 if (i==sizeof(s->s3->client_random))
803                         {
804                         Time=(unsigned long)time(NULL); /* Time */
805                         l2n(Time,p);
806                         RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
807                         }
808
809                 /* Do the message type and length last */
810                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
811
812                 *(p++)=s->version>>8;
813                 *(p++)=s->version&0xff;
814                 s->client_version=s->version;
815
816                 /* Random stuff */
817                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
818                 p+=SSL3_RANDOM_SIZE;
819
820                 /* Session ID */
821                 if (s->new_session)
822                         i=0;
823                 else
824                         i=s->session->session_id_length;
825                 *(p++)=i;
826                 if (i != 0)
827                         {
828                         if (i > sizeof s->session->session_id)
829                                 {
830                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
831                                 goto err;
832                                 }
833                         memcpy(p,s->session->session_id,i);
834                         p+=i;
835                         }
836                 
837                 /* cookie stuff */
838                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
839                         {
840                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
841                         goto err;
842                         }
843                 *(p++) = s->d1->cookie_len;
844                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
845                 p += s->d1->cookie_len;
846
847                 /* Ciphers supported */
848                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
849                 if (i == 0)
850                         {
851                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
852                         goto err;
853                         }
854                 s2n(i,p);
855                 p+=i;
856
857                 /* COMPRESSION */
858                 if (s->ctx->comp_methods == NULL)
859                         j=0;
860                 else
861                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
862                 *(p++)=1+j;
863                 for (i=0; i<j; i++)
864                         {
865                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
866                         *(p++)=comp->id;
867                         }
868                 *(p++)=0; /* Add the NULL method */
869
870 #ifndef OPENSSL_NO_TLSEXT
871                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
872                         {
873                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
874                         goto err;
875                         }
876 #endif          
877
878                 l=(p-d);
879                 d=buf;
880
881                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
882
883                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
884                 /* number of bytes to write */
885                 s->init_num=p-buf;
886                 s->init_off=0;
887
888                 /* buffer the message to handle re-xmits */
889                 dtls1_buffer_message(s, 0);
890                 }
891
892         /* SSL3_ST_CW_CLNT_HELLO_B */
893         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
894 err:
895         return(-1);
896         }
897
898 static int dtls1_get_hello_verify(SSL *s)
899         {
900         int n, al, ok = 0;
901         unsigned char *data;
902         unsigned int cookie_len;
903
904         n=s->method->ssl_get_message(s,
905                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
906                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
907                 -1,
908                 s->max_cert_list,
909                 &ok);
910
911         if (!ok) return((int)n);
912
913         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
914                 {
915                 s->d1->send_cookie = 0;
916                 s->s3->tmp.reuse_message=1;
917                 return(1);
918                 }
919
920         data = (unsigned char *)s->init_msg;
921
922         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
923                 {
924                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
925                 s->version=(s->version&0xff00)|data[1];
926                 al = SSL_AD_PROTOCOL_VERSION;
927                 goto f_err;
928                 }
929         data+=2;
930
931         cookie_len = *(data++);
932         if ( cookie_len > sizeof(s->d1->cookie))
933                 {
934                 al=SSL_AD_ILLEGAL_PARAMETER;
935                 goto f_err;
936                 }
937
938         memcpy(s->d1->cookie, data, cookie_len);
939         s->d1->cookie_len = cookie_len;
940
941         s->d1->send_cookie = 1;
942         return 1;
943
944 f_err:
945         ssl3_send_alert(s, SSL3_AL_FATAL, al);
946         return -1;
947         }
948
949 int dtls1_send_client_key_exchange(SSL *s)
950         {
951         unsigned char *p,*d;
952         int n;
953         unsigned long alg_k;
954 #ifndef OPENSSL_NO_RSA
955         unsigned char *q;
956         EVP_PKEY *pkey=NULL;
957 #endif
958 #ifndef OPENSSL_NO_KRB5
959         KSSL_ERR kssl_err;
960 #endif /* OPENSSL_NO_KRB5 */
961 #ifndef OPENSSL_NO_ECDH
962         EC_KEY *clnt_ecdh = NULL;
963         const EC_POINT *srvr_ecpoint = NULL;
964         EVP_PKEY *srvr_pub_pkey = NULL;
965         unsigned char *encodedPoint = NULL;
966         int encoded_pt_len = 0;
967         BN_CTX * bn_ctx = NULL;
968 #endif
969
970         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
971                 {
972                 d=(unsigned char *)s->init_buf->data;
973                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
974                 
975                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
976
977                 /* Fool emacs indentation */
978                 if (0) {}
979 #ifndef OPENSSL_NO_RSA
980                 else if (alg_k & SSL_kRSA)
981                         {
982                         RSA *rsa;
983                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
984
985                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
986                                 rsa=s->session->sess_cert->peer_rsa_tmp;
987                         else
988                                 {
989                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
990                                 if ((pkey == NULL) ||
991                                         (pkey->type != EVP_PKEY_RSA) ||
992                                         (pkey->pkey.rsa == NULL))
993                                         {
994                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
995                                         goto err;
996                                         }
997                                 rsa=pkey->pkey.rsa;
998                                 EVP_PKEY_free(pkey);
999                                 }
1000                                 
1001                         tmp_buf[0]=s->client_version>>8;
1002                         tmp_buf[1]=s->client_version&0xff;
1003                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1004                                         goto err;
1005
1006                         s->session->master_key_length=sizeof tmp_buf;
1007
1008                         q=p;
1009                         /* Fix buf for TLS and [incidentally] DTLS */
1010                         if (s->version > SSL3_VERSION)
1011                                 p+=2;
1012                         n=RSA_public_encrypt(sizeof tmp_buf,
1013                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1014 #ifdef PKCS1_CHECK
1015                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1016                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1017 #endif
1018                         if (n <= 0)
1019                                 {
1020                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1021                                 goto err;
1022                                 }
1023
1024                         /* Fix buf for TLS and [incidentally] DTLS */
1025                         if (s->version > SSL3_VERSION)
1026                                 {
1027                                 s2n(n,q);
1028                                 n+=2;
1029                                 }
1030
1031                         s->session->master_key_length=
1032                                 s->method->ssl3_enc->generate_master_secret(s,
1033                                         s->session->master_key,
1034                                         tmp_buf,sizeof tmp_buf);
1035                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1036                         }
1037 #endif
1038 #ifndef OPENSSL_NO_KRB5
1039                 else if (alg_k & SSL_kKRB5)
1040                         {
1041                         krb5_error_code krb5rc;
1042                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1043                         /*  krb5_data   krb5_ap_req;  */
1044                         krb5_data       *enc_ticket;
1045                         krb5_data       authenticator, *authp = NULL;
1046                         EVP_CIPHER_CTX  ciph_ctx;
1047                         const EVP_CIPHER *enc = NULL;
1048                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1049                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1050                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
1051                                                 + EVP_MAX_IV_LENGTH];
1052                         int             padl, outl = sizeof(epms);
1053
1054                         EVP_CIPHER_CTX_init(&ciph_ctx);
1055
1056 #ifdef KSSL_DEBUG
1057                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1058                                 alg_k, SSL_kKRB5);
1059 #endif  /* KSSL_DEBUG */
1060
1061                         authp = NULL;
1062 #ifdef KRB5SENDAUTH
1063                         if (KRB5SENDAUTH)  authp = &authenticator;
1064 #endif  /* KRB5SENDAUTH */
1065
1066                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1067                                 &kssl_err);
1068                         enc = kssl_map_enc(kssl_ctx->enctype);
1069                         if (enc == NULL)
1070                             goto err;
1071 #ifdef KSSL_DEBUG
1072                         {
1073                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1074                         if (krb5rc && kssl_err.text)
1075                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1076                         }
1077 #endif  /* KSSL_DEBUG */
1078
1079                         if (krb5rc)
1080                                 {
1081                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1082                                                 SSL_AD_HANDSHAKE_FAILURE);
1083                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1084                                                 kssl_err.reason);
1085                                 goto err;
1086                                 }
1087
1088                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1089                         **  in place of RFC 2712 KerberosWrapper, as in:
1090                         **
1091                         **  Send ticket (copy to *p, set n = length)
1092                         **  n = krb5_ap_req.length;
1093                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1094                         **  if (krb5_ap_req.data)  
1095                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1096                         **
1097                         **  Now using real RFC 2712 KerberosWrapper
1098                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1099                         **  Note: 2712 "opaque" types are here replaced
1100                         **  with a 2-byte length followed by the value.
1101                         **  Example:
1102                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1103                         **  Where "xx xx" = length bytes.  Shown here with
1104                         **  optional authenticator omitted.
1105                         */
1106
1107                         /*  KerberosWrapper.Ticket              */
1108                         s2n(enc_ticket->length,p);
1109                         memcpy(p, enc_ticket->data, enc_ticket->length);
1110                         p+= enc_ticket->length;
1111                         n = enc_ticket->length + 2;
1112
1113                         /*  KerberosWrapper.Authenticator       */
1114                         if (authp  &&  authp->length)  
1115                                 {
1116                                 s2n(authp->length,p);
1117                                 memcpy(p, authp->data, authp->length);
1118                                 p+= authp->length;
1119                                 n+= authp->length + 2;
1120                                 
1121                                 free(authp->data);
1122                                 authp->data = NULL;
1123                                 authp->length = 0;
1124                                 }
1125                         else
1126                                 {
1127                                 s2n(0,p);/*  null authenticator length  */
1128                                 n+=2;
1129                                 }
1130  
1131                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1132                             goto err;
1133
1134                         /*  20010420 VRS.  Tried it this way; failed.
1135                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1136                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1137                         **                              kssl_ctx->length);
1138                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1139                         */
1140
1141                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1142                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1143                                 kssl_ctx->key,iv);
1144                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1145                                 sizeof tmp_buf);
1146                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1147                         outl += padl;
1148                         if (outl > (int)sizeof epms)
1149                                 {
1150                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1151                                 goto err;
1152                                 }
1153                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1154
1155                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1156                         s2n(outl,p);
1157                         memcpy(p, epms, outl);
1158                         p+=outl;
1159                         n+=outl + 2;
1160
1161                         s->session->master_key_length=
1162                                 s->method->ssl3_enc->generate_master_secret(s,
1163                                         s->session->master_key,
1164                                         tmp_buf, sizeof tmp_buf);
1165
1166                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1167                         OPENSSL_cleanse(epms, outl);
1168                         }
1169 #endif
1170 #ifndef OPENSSL_NO_DH
1171                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1172                         {
1173                         DH *dh_srvr,*dh_clnt;
1174
1175                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1176                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1177                         else
1178                                 {
1179                                 /* we get them from the cert */
1180                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1181                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1182                                 goto err;
1183                                 }
1184                         
1185                         /* generate a new random key */
1186                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1187                                 {
1188                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1189                                 goto err;
1190                                 }
1191                         if (!DH_generate_key(dh_clnt))
1192                                 {
1193                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1194                                 goto err;
1195                                 }
1196
1197                         /* use the 'p' output buffer for the DH key, but
1198                          * make sure to clear it out afterwards */
1199
1200                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1201
1202                         if (n <= 0)
1203                                 {
1204                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1205                                 goto err;
1206                                 }
1207
1208                         /* generate master key from the result */
1209                         s->session->master_key_length=
1210                                 s->method->ssl3_enc->generate_master_secret(s,
1211                                         s->session->master_key,p,n);
1212                         /* clean up */
1213                         memset(p,0,n);
1214
1215                         /* send off the data */
1216                         n=BN_num_bytes(dh_clnt->pub_key);
1217                         s2n(n,p);
1218                         BN_bn2bin(dh_clnt->pub_key,p);
1219                         n+=2;
1220
1221                         DH_free(dh_clnt);
1222
1223                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1224                         }
1225 #endif
1226 #ifndef OPENSSL_NO_ECDH 
1227                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1228                         {
1229                         const EC_GROUP *srvr_group = NULL;
1230                         EC_KEY *tkey;
1231                         int ecdh_clnt_cert = 0;
1232                         int field_size = 0;
1233
1234                         /* Did we send out the client's
1235                          * ECDH share for use in premaster
1236                          * computation as part of client certificate?
1237                          * If so, set ecdh_clnt_cert to 1.
1238                          */
1239                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
1240                                 {
1241                                 /* XXX: For now, we do not support client
1242                                  * authentication using ECDH certificates.
1243                                  * To add such support, one needs to add
1244                                  * code that checks for appropriate 
1245                                  * conditions and sets ecdh_clnt_cert to 1.
1246                                  * For example, the cert have an ECC
1247                                  * key on the same curve as the server's
1248                                  * and the key should be authorized for
1249                                  * key agreement.
1250                                  *
1251                                  * One also needs to add code in ssl3_connect
1252                                  * to skip sending the certificate verify
1253                                  * message.
1254                                  *
1255                                  * if ((s->cert->key->privatekey != NULL) &&
1256                                  *     (s->cert->key->privatekey->type ==
1257                                  *      EVP_PKEY_EC) && ...)
1258                                  * ecdh_clnt_cert = 1;
1259                                  */
1260                                 }
1261
1262                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1263                                 {
1264                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1265                                 }
1266                         else
1267                                 {
1268                                 /* Get the Server Public Key from Cert */
1269                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1270                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1271                                 if ((srvr_pub_pkey == NULL) ||
1272                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1273                                     (srvr_pub_pkey->pkey.ec == NULL))
1274                                         {
1275                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1276                                             ERR_R_INTERNAL_ERROR);
1277                                         goto err;
1278                                         }
1279
1280                                 tkey = srvr_pub_pkey->pkey.ec;
1281                                 }
1282
1283                         srvr_group   = EC_KEY_get0_group(tkey);
1284                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1285
1286                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1287                                 {
1288                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1289                                     ERR_R_INTERNAL_ERROR);
1290                                 goto err;
1291                                 }
1292
1293                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
1294                                 {
1295                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1296                                 goto err;
1297                                 }
1298
1299                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1300                                 {
1301                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1302                                 goto err;
1303                                 }
1304                         if (ecdh_clnt_cert) 
1305                                 { 
1306                                 /* Reuse key info from our certificate
1307                                  * We only need our private key to perform
1308                                  * the ECDH computation.
1309                                  */
1310                                 const BIGNUM *priv_key;
1311                                 tkey = s->cert->key->privatekey->pkey.ec;
1312                                 priv_key = EC_KEY_get0_private_key(tkey);
1313                                 if (priv_key == NULL)
1314                                         {
1315                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1316                                         goto err;
1317                                         }
1318                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1319                                         {
1320                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1321                                         goto err;
1322                                         }
1323                                 }
1324                         else 
1325                                 {
1326                                 /* Generate a new ECDH key pair */
1327                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1328                                         {
1329                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1330                                         goto err;
1331                                         }
1332                                 }
1333
1334                         /* use the 'p' output buffer for the ECDH key, but
1335                          * make sure to clear it out afterwards
1336                          */
1337
1338                         field_size = EC_GROUP_get_degree(srvr_group);
1339                         if (field_size <= 0)
1340                                 {
1341                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 
1342                                        ERR_R_ECDH_LIB);
1343                                 goto err;
1344                                 }
1345                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1346                         if (n <= 0)
1347                                 {
1348                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 
1349                                        ERR_R_ECDH_LIB);
1350                                 goto err;
1351                                 }
1352
1353                         /* generate master key from the result */
1354                         s->session->master_key_length = s->method->ssl3_enc \
1355                             -> generate_master_secret(s, 
1356                                 s->session->master_key,
1357                                 p, n);
1358
1359                         memset(p, 0, n); /* clean up */
1360
1361                         if (ecdh_clnt_cert) 
1362                                 {
1363                                 /* Send empty client key exch message */
1364                                 n = 0;
1365                                 }
1366                         else 
1367                                 {
1368                                 /* First check the size of encoding and
1369                                  * allocate memory accordingly.
1370                                  */
1371                                 encoded_pt_len = 
1372                                     EC_POINT_point2oct(srvr_group, 
1373                                         EC_KEY_get0_public_key(clnt_ecdh), 
1374                                         POINT_CONVERSION_UNCOMPRESSED, 
1375                                         NULL, 0, NULL);
1376
1377                                 encodedPoint = (unsigned char *) 
1378                                     OPENSSL_malloc(encoded_pt_len * 
1379                                         sizeof(unsigned char)); 
1380                                 bn_ctx = BN_CTX_new();
1381                                 if ((encodedPoint == NULL) || 
1382                                     (bn_ctx == NULL)) 
1383                                         {
1384                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1385                                         goto err;
1386                                         }
1387
1388                                 /* Encode the public key */
1389                                 n = EC_POINT_point2oct(srvr_group, 
1390                                     EC_KEY_get0_public_key(clnt_ecdh), 
1391                                     POINT_CONVERSION_UNCOMPRESSED, 
1392                                     encodedPoint, encoded_pt_len, bn_ctx);
1393
1394                                 *p = n; /* length of encoded point */
1395                                 /* Encoded point will be copied here */
1396                                 p += 1; 
1397                                 /* copy the point */
1398                                 memcpy((unsigned char *)p, encodedPoint, n);
1399                                 /* increment n to account for length field */
1400                                 n += 1; 
1401                                 }
1402
1403                         /* Free allocated memory */
1404                         BN_CTX_free(bn_ctx);
1405                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1406                         if (clnt_ecdh != NULL) 
1407                                  EC_KEY_free(clnt_ecdh);
1408                         EVP_PKEY_free(srvr_pub_pkey);
1409                         }
1410 #endif /* !OPENSSL_NO_ECDH */
1411
1412 #ifndef OPENSSL_NO_PSK
1413                 else if (alg_k & SSL_kPSK)
1414                         {
1415                         char identity[PSK_MAX_IDENTITY_LEN];
1416                         unsigned char *t = NULL;
1417                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1418                         unsigned int pre_ms_len = 0, psk_len = 0;
1419                         int psk_err = 1;
1420
1421                         n = 0;
1422                         if (s->psk_client_callback == NULL)
1423                                 {
1424                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1425                                         SSL_R_PSK_NO_CLIENT_CB);
1426                                 goto err;
1427                                 }
1428
1429                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1430                                 identity, PSK_MAX_IDENTITY_LEN,
1431                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1432                         if (psk_len > PSK_MAX_PSK_LEN)
1433                                 {
1434                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1435                                         ERR_R_INTERNAL_ERROR);
1436                                 goto psk_err;
1437                                 }
1438                         else if (psk_len == 0)
1439                                 {
1440                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1441                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1442                                 goto psk_err;
1443                                 }
1444
1445                         /* create PSK pre_master_secret */
1446                         pre_ms_len = 2+psk_len+2+psk_len;
1447                         t = psk_or_pre_ms;
1448                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1449                         s2n(psk_len, t);
1450                         memset(t, 0, psk_len);
1451                         t+=psk_len;
1452                         s2n(psk_len, t);
1453
1454                         if (s->session->psk_identity_hint != NULL)
1455                                 OPENSSL_free(s->session->psk_identity_hint);
1456                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1457                         if (s->ctx->psk_identity_hint != NULL &&
1458                                 s->session->psk_identity_hint == NULL)
1459                                 {
1460                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1461                                         ERR_R_MALLOC_FAILURE);
1462                                 goto psk_err;
1463                                 }
1464
1465                         if (s->session->psk_identity != NULL)
1466                                 OPENSSL_free(s->session->psk_identity);
1467                         s->session->psk_identity = BUF_strdup(identity);
1468                         if (s->session->psk_identity == NULL)
1469                                 {
1470                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1471                                         ERR_R_MALLOC_FAILURE);
1472                                 goto psk_err;
1473                                 }
1474
1475                         s->session->master_key_length =
1476                                 s->method->ssl3_enc->generate_master_secret(s,
1477                                         s->session->master_key,
1478                                         psk_or_pre_ms, pre_ms_len); 
1479                         n = strlen(identity);
1480                         s2n(n, p);
1481                         memcpy(p, identity, n);
1482                         n+=2;
1483                         psk_err = 0;
1484                 psk_err:
1485                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1486                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1487                         if (psk_err != 0)
1488                                 {
1489                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1490                                 goto err;
1491                                 }
1492                         }
1493 #endif
1494                 else
1495                         {
1496                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1497                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1498                         goto err;
1499                         }
1500                 
1501                 d = dtls1_set_message_header(s, d,
1502                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1503                 /*
1504                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1505                  l2n3(n,d);
1506                  l2n(s->d1->handshake_write_seq,d);
1507                  s->d1->handshake_write_seq++;
1508                 */
1509                 
1510                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1511                 /* number of bytes to write */
1512                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1513                 s->init_off=0;
1514
1515                 /* buffer the message to handle re-xmits */
1516                 dtls1_buffer_message(s, 0);
1517                 }
1518         
1519         /* SSL3_ST_CW_KEY_EXCH_B */
1520         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1521 err:
1522 #ifndef OPENSSL_NO_ECDH
1523         BN_CTX_free(bn_ctx);
1524         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1525         if (clnt_ecdh != NULL) 
1526                 EC_KEY_free(clnt_ecdh);
1527         EVP_PKEY_free(srvr_pub_pkey);
1528 #endif
1529         return(-1);
1530         }
1531
1532 int dtls1_send_client_verify(SSL *s)
1533         {
1534         unsigned char *p,*d;
1535         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1536         EVP_PKEY *pkey;
1537 #ifndef OPENSSL_NO_RSA
1538         unsigned u=0;
1539 #endif
1540         unsigned long n;
1541 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1542         int j;
1543 #endif
1544
1545         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1546                 {
1547                 d=(unsigned char *)s->init_buf->data;
1548                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1549                 pkey=s->cert->key->privatekey;
1550
1551                 s->method->ssl3_enc->cert_verify_mac(s,
1552                 NID_sha1,
1553                         &(data[MD5_DIGEST_LENGTH]));
1554
1555 #ifndef OPENSSL_NO_RSA
1556                 if (pkey->type == EVP_PKEY_RSA)
1557                         {
1558                         s->method->ssl3_enc->cert_verify_mac(s,
1559                                 NID_md5,
1560                                 &(data[0]));
1561                         if (RSA_sign(NID_md5_sha1, data,
1562                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1563                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1564                                 {
1565                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1566                                 goto err;
1567                                 }
1568                         s2n(u,p);
1569                         n=u+2;
1570                         }
1571                 else
1572 #endif
1573 #ifndef OPENSSL_NO_DSA
1574                         if (pkey->type == EVP_PKEY_DSA)
1575                         {
1576                         if (!DSA_sign(pkey->save_type,
1577                                 &(data[MD5_DIGEST_LENGTH]),
1578                                 SHA_DIGEST_LENGTH,&(p[2]),
1579                                 (unsigned int *)&j,pkey->pkey.dsa))
1580                                 {
1581                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1582                                 goto err;
1583                                 }
1584                         s2n(j,p);
1585                         n=j+2;
1586                         }
1587                 else
1588 #endif
1589 #ifndef OPENSSL_NO_ECDSA
1590                         if (pkey->type == EVP_PKEY_EC)
1591                         {
1592                         if (!ECDSA_sign(pkey->save_type,
1593                                 &(data[MD5_DIGEST_LENGTH]),
1594                                 SHA_DIGEST_LENGTH,&(p[2]),
1595                                 (unsigned int *)&j,pkey->pkey.ec))
1596                                 {
1597                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1598                                     ERR_R_ECDSA_LIB);
1599                                 goto err;
1600                                 }
1601                         s2n(j,p);
1602                         n=j+2;
1603                         }
1604                 else
1605 #endif
1606                         {
1607                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1608                         goto err;
1609                         }
1610
1611                 d = dtls1_set_message_header(s, d,
1612                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1613
1614                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1615                 s->init_off=0;
1616
1617                 /* buffer the message to handle re-xmits */
1618                 dtls1_buffer_message(s, 0);
1619
1620                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1621                 }
1622
1623         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1624         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1625 err:
1626         return(-1);
1627         }
1628
1629 int dtls1_send_client_certificate(SSL *s)
1630         {
1631         X509 *x509=NULL;
1632         EVP_PKEY *pkey=NULL;
1633         int i;
1634         unsigned long l;
1635
1636         if (s->state == SSL3_ST_CW_CERT_A)
1637                 {
1638                 if ((s->cert == NULL) ||
1639                         (s->cert->key->x509 == NULL) ||
1640                         (s->cert->key->privatekey == NULL))
1641                         s->state=SSL3_ST_CW_CERT_B;
1642                 else
1643                         s->state=SSL3_ST_CW_CERT_C;
1644                 }
1645
1646         /* We need to get a client cert */
1647         if (s->state == SSL3_ST_CW_CERT_B)
1648                 {
1649                 /* If we get an error, we need to
1650                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1651                  * We then get retied later */
1652                 i=0;
1653                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1654                 if (i < 0)
1655                         {
1656                         s->rwstate=SSL_X509_LOOKUP;
1657                         return(-1);
1658                         }
1659                 s->rwstate=SSL_NOTHING;
1660                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1661                         {
1662                         s->state=SSL3_ST_CW_CERT_B;
1663                         if (    !SSL_use_certificate(s,x509) ||
1664                                 !SSL_use_PrivateKey(s,pkey))
1665                                 i=0;
1666                         }
1667                 else if (i == 1)
1668                         {
1669                         i=0;
1670                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1671                         }
1672
1673                 if (x509 != NULL) X509_free(x509);
1674                 if (pkey != NULL) EVP_PKEY_free(pkey);
1675                 if (i == 0)
1676                         {
1677                         if (s->version == SSL3_VERSION)
1678                                 {
1679                                 s->s3->tmp.cert_req=0;
1680                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1681                                 return(1);
1682                                 }
1683                         else
1684                                 {
1685                                 s->s3->tmp.cert_req=2;
1686                                 }
1687                         }
1688
1689                 /* Ok, we have a cert */
1690                 s->state=SSL3_ST_CW_CERT_C;
1691                 }
1692
1693         if (s->state == SSL3_ST_CW_CERT_C)
1694                 {
1695                 s->state=SSL3_ST_CW_CERT_D;
1696                 l=dtls1_output_cert_chain(s,
1697                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
1698                 s->init_num=(int)l;
1699                 s->init_off=0;
1700
1701                 /* set header called by dtls1_output_cert_chain() */
1702
1703                 /* buffer the message to handle re-xmits */
1704                 dtls1_buffer_message(s, 0);
1705                 }
1706         /* SSL3_ST_CW_CERT_D */
1707         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1708         }
1709
1710