Add ECC extensions with DTLS.
[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                         s->state=SSL3_ST_CW_FINISHED_A;
542                         s->init_num=0;
543
544                         s->session->cipher=s->s3->tmp.new_cipher;
545 #ifdef OPENSSL_NO_COMP
546                         s->session->compress_meth=0;
547 #else
548                         if (s->s3->tmp.new_compression == NULL)
549                                 s->session->compress_meth=0;
550                         else
551                                 s->session->compress_meth=
552                                         s->s3->tmp.new_compression->id;
553 #endif
554                         if (!s->method->ssl3_enc->setup_key_block(s))
555                                 {
556                                 ret= -1;
557                                 goto end;
558                                 }
559
560                         if (!s->method->ssl3_enc->change_cipher_state(s,
561                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
562                                 {
563                                 ret= -1;
564                                 goto end;
565                                 }
566                         
567 #ifndef OPENSSL_NO_SCTP
568                                 if (s->hit)
569                                         {
570                                         /* Change to new shared key of SCTP-Auth,
571                                          * will be ignored if no SCTP used.
572                                          */
573                                         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
574                                         }
575 #endif
576
577                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
578                         break;
579
580                 case SSL3_ST_CW_FINISHED_A:
581                 case SSL3_ST_CW_FINISHED_B:
582                         if (!s->hit)
583                                 dtls1_start_timer(s);
584                         ret=dtls1_send_finished(s,
585                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
586                                 s->method->ssl3_enc->client_finished_label,
587                                 s->method->ssl3_enc->client_finished_label_len);
588                         if (ret <= 0) goto end;
589                         s->state=SSL3_ST_CW_FLUSH;
590
591                         /* clear flags */
592                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
593                         if (s->hit)
594                                 {
595                                 s->s3->tmp.next_state=SSL_ST_OK;
596 #ifndef OPENSSL_NO_SCTP
597                                 if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
598                                         {
599                                                 s->d1->next_state = s->s3->tmp.next_state;
600                                                 s->s3->tmp.next_state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
601                                         }
602 #endif
603                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
604                                         {
605                                         s->state=SSL_ST_OK;
606 #ifndef OPENSSL_NO_SCTP
607                                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
608                                                 {
609                                                         s->d1->next_state = SSL_ST_OK;
610                                                         s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
611                                                 }
612 #endif
613                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
614                                         s->s3->delay_buf_pop_ret=0;
615                                         }
616                                 }
617                         else
618                                 {
619 #ifndef OPENSSL_NO_SCTP
620                                 /* Change to new shared key of SCTP-Auth,
621                                  * will be ignored if no SCTP used.
622                                  */
623                                 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY, 0, NULL);
624 #endif
625
626 #ifndef OPENSSL_NO_TLSEXT
627                                 /* Allow NewSessionTicket if ticket expected */
628                                 if (s->tlsext_ticket_expected)
629                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
630                                 else
631 #endif
632                                 
633                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
634                                 }
635                         s->init_num=0;
636                         break;
637
638 #ifndef OPENSSL_NO_TLSEXT
639                 case SSL3_ST_CR_SESSION_TICKET_A:
640                 case SSL3_ST_CR_SESSION_TICKET_B:
641                         ret=ssl3_get_new_session_ticket(s);
642                         if (ret <= 0) goto end;
643                         s->state=SSL3_ST_CR_FINISHED_A;
644                         s->init_num=0;
645                 break;
646
647                 case SSL3_ST_CR_CERT_STATUS_A:
648                 case SSL3_ST_CR_CERT_STATUS_B:
649                         ret=ssl3_get_cert_status(s);
650                         if (ret <= 0) goto end;
651                         s->state=SSL3_ST_CR_KEY_EXCH_A;
652                         s->init_num=0;
653                 break;
654 #endif
655
656                 case SSL3_ST_CR_FINISHED_A:
657                 case SSL3_ST_CR_FINISHED_B:
658                         s->d1->change_cipher_spec_ok = 1;
659                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
660                                 SSL3_ST_CR_FINISHED_B);
661                         if (ret <= 0) goto end;
662                         dtls1_stop_timer(s);
663
664                         if (s->hit)
665                                 s->state=SSL3_ST_CW_CHANGE_A;
666                         else
667                                 s->state=SSL_ST_OK;
668
669 #ifndef OPENSSL_NO_SCTP
670                         if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
671                                 state == SSL_ST_RENEGOTIATE)
672                                 {
673                                 s->d1->next_state=s->state;
674                                 s->state=DTLS1_SCTP_ST_CW_WRITE_SOCK;
675                                 }
676 #endif
677
678                         s->init_num=0;
679                         break;
680
681                 case SSL3_ST_CW_FLUSH:
682                         s->rwstate=SSL_WRITING;
683                         if (BIO_flush(s->wbio) <= 0)
684                                 {
685                                 /* If the write error was fatal, stop trying */
686                                 if (!BIO_should_retry(s->wbio))
687                                         {
688                                         s->rwstate=SSL_NOTHING;
689                                         s->state=s->s3->tmp.next_state;
690                                         }
691                                 
692                                 ret= -1;
693                                 goto end;
694                                 }
695                         s->rwstate=SSL_NOTHING;
696                         s->state=s->s3->tmp.next_state;
697                         break;
698
699                 case SSL_ST_OK:
700                         /* clean a few things up */
701                         ssl3_cleanup_key_block(s);
702
703 #if 0
704                         if (s->init_buf != NULL)
705                                 {
706                                 BUF_MEM_free(s->init_buf);
707                                 s->init_buf=NULL;
708                                 }
709 #endif
710
711                         /* If we are not 'joining' the last two packets,
712                          * remove the buffering now */
713                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
714                                 ssl_free_wbio_buffer(s);
715                         /* else do it later in ssl3_write */
716
717                         s->init_num=0;
718                         s->renegotiate=0;
719                         s->new_session=0;
720
721                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
722                         if (s->hit) s->ctx->stats.sess_hit++;
723
724                         ret=1;
725                         /* s->server=0; */
726                         s->handshake_func=dtls1_connect;
727                         s->ctx->stats.sess_connect_good++;
728
729                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
730
731                         /* done with handshaking */
732                         s->d1->handshake_read_seq  = 0;
733                         s->d1->next_handshake_write_seq = 0;
734                         goto end;
735                         /* break; */
736                         
737                 default:
738                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
739                         ret= -1;
740                         goto end;
741                         /* break; */
742                         }
743
744                 /* did we do anything */
745                 if (!s->s3->tmp.reuse_message && !skip)
746                         {
747                         if (s->debug)
748                                 {
749                                 if ((ret=BIO_flush(s->wbio)) <= 0)
750                                         goto end;
751                                 }
752
753                         if ((cb != NULL) && (s->state != state))
754                                 {
755                                 new_state=s->state;
756                                 s->state=state;
757                                 cb(s,SSL_CB_CONNECT_LOOP,1);
758                                 s->state=new_state;
759                                 }
760                         }
761                 skip=0;
762                 }
763 end:
764         s->in_handshake--;
765         
766 #ifndef OPENSSL_NO_SCTP
767         /* Notify SCTP BIO socket to leave handshake
768          * mode and allow stream identifier other
769          * than 0. Will be ignored if no SCTP is used.
770          */
771         BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE, s->in_handshake, NULL);
772 #endif
773
774         if (buf != NULL)
775                 BUF_MEM_free(buf);
776         if (cb != NULL)
777                 cb(s,SSL_CB_CONNECT_EXIT,ret);
778         return(ret);
779         }
780
781 int dtls1_client_hello(SSL *s)
782         {
783         unsigned char *buf;
784         unsigned char *p,*d;
785         unsigned int i,j;
786         unsigned long l;
787         SSL_COMP *comp;
788
789         buf=(unsigned char *)s->init_buf->data;
790         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
791                 {
792                 SSL_SESSION *sess = s->session;
793                 if ((s->session == NULL) ||
794                         (s->session->ssl_version != s->version) ||
795 #ifdef OPENSSL_NO_TLSEXT
796                         !sess->session_id_length ||
797 #else
798                         (!sess->session_id_length && !sess->tlsext_tick) ||
799 #endif
800                         (s->session->not_resumable))
801                         {
802                         if (!ssl_get_new_session(s,0))
803                                 goto err;
804                         }
805                 /* else use the pre-loaded session */
806
807                 p=s->s3->client_random;
808
809                 /* if client_random is initialized, reuse it, we are
810                  * required to use same upon reply to HelloVerify */
811                 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++)
812                         ;
813                 if (i==sizeof(s->s3->client_random))
814                         ssl_fill_hello_random(s, 0, p,
815                                               sizeof(s->s3->client_random));
816
817                 /* Do the message type and length last */
818                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
819
820                 *(p++)=s->version>>8;
821                 *(p++)=s->version&0xff;
822                 s->client_version=s->version;
823
824                 /* Random stuff */
825                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
826                 p+=SSL3_RANDOM_SIZE;
827
828                 /* Session ID */
829                 if (s->new_session)
830                         i=0;
831                 else
832                         i=s->session->session_id_length;
833                 *(p++)=i;
834                 if (i != 0)
835                         {
836                         if (i > sizeof s->session->session_id)
837                                 {
838                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
839                                 goto err;
840                                 }
841                         memcpy(p,s->session->session_id,i);
842                         p+=i;
843                         }
844                 
845                 /* cookie stuff */
846                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
847                         {
848                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
849                         goto err;
850                         }
851                 *(p++) = s->d1->cookie_len;
852                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
853                 p += s->d1->cookie_len;
854
855                 /* Ciphers supported */
856                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
857                 if (i == 0)
858                         {
859                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
860                         goto err;
861                         }
862                 s2n(i,p);
863                 p+=i;
864
865                 /* COMPRESSION */
866                 if (s->ctx->comp_methods == NULL)
867                         j=0;
868                 else
869                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
870                 *(p++)=1+j;
871                 for (i=0; i<j; i++)
872                         {
873                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
874                         *(p++)=comp->id;
875                         }
876                 *(p++)=0; /* Add the NULL method */
877
878 #ifndef OPENSSL_NO_TLSEXT
879                 /* TLS extensions*/
880                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
881                         {
882                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
883                         goto err;
884                         }
885                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
886                         {
887                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
888                         goto err;
889                         }
890 #endif
891
892                 l=(p-d);
893                 d=buf;
894
895                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
896
897                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
898                 /* number of bytes to write */
899                 s->init_num=p-buf;
900                 s->init_off=0;
901
902                 /* buffer the message to handle re-xmits */
903                 dtls1_buffer_message(s, 0);
904                 }
905
906         /* SSL3_ST_CW_CLNT_HELLO_B */
907         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
908 err:
909         return(-1);
910         }
911
912 static int dtls1_get_hello_verify(SSL *s)
913         {
914         int n, al, ok = 0;
915         unsigned char *data;
916         unsigned int cookie_len;
917
918         n=s->method->ssl_get_message(s,
919                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
920                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
921                 -1,
922                 s->max_cert_list,
923                 &ok);
924
925         if (!ok) return((int)n);
926
927         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
928                 {
929                 s->d1->send_cookie = 0;
930                 s->s3->tmp.reuse_message=1;
931                 return(1);
932                 }
933
934         data = (unsigned char *)s->init_msg;
935
936         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
937                 {
938                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
939                 s->version=(s->version&0xff00)|data[1];
940                 al = SSL_AD_PROTOCOL_VERSION;
941                 goto f_err;
942                 }
943         data+=2;
944
945         cookie_len = *(data++);
946         if ( cookie_len > sizeof(s->d1->cookie))
947                 {
948                 al=SSL_AD_ILLEGAL_PARAMETER;
949                 goto f_err;
950                 }
951
952         memcpy(s->d1->cookie, data, cookie_len);
953         s->d1->cookie_len = cookie_len;
954
955         s->d1->send_cookie = 1;
956         return 1;
957
958 f_err:
959         ssl3_send_alert(s, SSL3_AL_FATAL, al);
960         return -1;
961         }
962
963 int dtls1_send_client_key_exchange(SSL *s)
964         {
965         unsigned char *p,*d;
966         int n;
967         unsigned long alg_k;
968 #ifndef OPENSSL_NO_RSA
969         unsigned char *q;
970         EVP_PKEY *pkey=NULL;
971 #endif
972 #ifndef OPENSSL_NO_KRB5
973         KSSL_ERR kssl_err;
974 #endif /* OPENSSL_NO_KRB5 */
975 #ifndef OPENSSL_NO_ECDH
976         EC_KEY *clnt_ecdh = NULL;
977         const EC_POINT *srvr_ecpoint = NULL;
978         EVP_PKEY *srvr_pub_pkey = NULL;
979         unsigned char *encodedPoint = NULL;
980         int encoded_pt_len = 0;
981         BN_CTX * bn_ctx = NULL;
982 #endif
983
984         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
985                 {
986                 d=(unsigned char *)s->init_buf->data;
987                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
988                 
989                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
990
991                 /* Fool emacs indentation */
992                 if (0) {}
993 #ifndef OPENSSL_NO_RSA
994                 else if (alg_k & SSL_kRSA)
995                         {
996                         RSA *rsa;
997                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
998
999                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1000                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1001                         else
1002                                 {
1003                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1004                                 if ((pkey == NULL) ||
1005                                         (pkey->type != EVP_PKEY_RSA) ||
1006                                         (pkey->pkey.rsa == NULL))
1007                                         {
1008                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1009                                         goto err;
1010                                         }
1011                                 rsa=pkey->pkey.rsa;
1012                                 EVP_PKEY_free(pkey);
1013                                 }
1014                                 
1015                         tmp_buf[0]=s->client_version>>8;
1016                         tmp_buf[1]=s->client_version&0xff;
1017                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1018                                         goto err;
1019
1020                         s->session->master_key_length=sizeof tmp_buf;
1021
1022                         q=p;
1023                         /* Fix buf for TLS and [incidentally] DTLS */
1024                         if (s->version > SSL3_VERSION)
1025                                 p+=2;
1026                         n=RSA_public_encrypt(sizeof tmp_buf,
1027                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1028 #ifdef PKCS1_CHECK
1029                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1030                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1031 #endif
1032                         if (n <= 0)
1033                                 {
1034                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1035                                 goto err;
1036                                 }
1037
1038                         /* Fix buf for TLS and [incidentally] DTLS */
1039                         if (s->version > SSL3_VERSION)
1040                                 {
1041                                 s2n(n,q);
1042                                 n+=2;
1043                                 }
1044
1045                         s->session->master_key_length=
1046                                 s->method->ssl3_enc->generate_master_secret(s,
1047                                         s->session->master_key,
1048                                         tmp_buf,sizeof tmp_buf);
1049                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1050                         }
1051 #endif
1052 #ifndef OPENSSL_NO_KRB5
1053                 else if (alg_k & SSL_kKRB5)
1054                         {
1055                         krb5_error_code krb5rc;
1056                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1057                         /*  krb5_data   krb5_ap_req;  */
1058                         krb5_data       *enc_ticket;
1059                         krb5_data       authenticator, *authp = NULL;
1060                         EVP_CIPHER_CTX  ciph_ctx;
1061                         const EVP_CIPHER *enc = NULL;
1062                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1063                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1064                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
1065                                                 + EVP_MAX_IV_LENGTH];
1066                         int             padl, outl = sizeof(epms);
1067
1068                         EVP_CIPHER_CTX_init(&ciph_ctx);
1069
1070 #ifdef KSSL_DEBUG
1071                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1072                                 alg_k, SSL_kKRB5);
1073 #endif  /* KSSL_DEBUG */
1074
1075                         authp = NULL;
1076 #ifdef KRB5SENDAUTH
1077                         if (KRB5SENDAUTH)  authp = &authenticator;
1078 #endif  /* KRB5SENDAUTH */
1079
1080                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1081                                 &kssl_err);
1082                         enc = kssl_map_enc(kssl_ctx->enctype);
1083                         if (enc == NULL)
1084                             goto err;
1085 #ifdef KSSL_DEBUG
1086                         {
1087                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1088                         if (krb5rc && kssl_err.text)
1089                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1090                         }
1091 #endif  /* KSSL_DEBUG */
1092
1093                         if (krb5rc)
1094                                 {
1095                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1096                                                 SSL_AD_HANDSHAKE_FAILURE);
1097                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1098                                                 kssl_err.reason);
1099                                 goto err;
1100                                 }
1101
1102                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1103                         **  in place of RFC 2712 KerberosWrapper, as in:
1104                         **
1105                         **  Send ticket (copy to *p, set n = length)
1106                         **  n = krb5_ap_req.length;
1107                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1108                         **  if (krb5_ap_req.data)  
1109                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1110                         **
1111                         **  Now using real RFC 2712 KerberosWrapper
1112                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1113                         **  Note: 2712 "opaque" types are here replaced
1114                         **  with a 2-byte length followed by the value.
1115                         **  Example:
1116                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1117                         **  Where "xx xx" = length bytes.  Shown here with
1118                         **  optional authenticator omitted.
1119                         */
1120
1121                         /*  KerberosWrapper.Ticket              */
1122                         s2n(enc_ticket->length,p);
1123                         memcpy(p, enc_ticket->data, enc_ticket->length);
1124                         p+= enc_ticket->length;
1125                         n = enc_ticket->length + 2;
1126
1127                         /*  KerberosWrapper.Authenticator       */
1128                         if (authp  &&  authp->length)  
1129                                 {
1130                                 s2n(authp->length,p);
1131                                 memcpy(p, authp->data, authp->length);
1132                                 p+= authp->length;
1133                                 n+= authp->length + 2;
1134                                 
1135                                 free(authp->data);
1136                                 authp->data = NULL;
1137                                 authp->length = 0;
1138                                 }
1139                         else
1140                                 {
1141                                 s2n(0,p);/*  null authenticator length  */
1142                                 n+=2;
1143                                 }
1144  
1145                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1146                             goto err;
1147
1148                         /*  20010420 VRS.  Tried it this way; failed.
1149                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1150                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1151                         **                              kssl_ctx->length);
1152                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1153                         */
1154
1155                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1156                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1157                                 kssl_ctx->key,iv);
1158                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1159                                 sizeof tmp_buf);
1160                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1161                         outl += padl;
1162                         if (outl > (int)sizeof epms)
1163                                 {
1164                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1165                                 goto err;
1166                                 }
1167                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1168
1169                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1170                         s2n(outl,p);
1171                         memcpy(p, epms, outl);
1172                         p+=outl;
1173                         n+=outl + 2;
1174
1175                         s->session->master_key_length=
1176                                 s->method->ssl3_enc->generate_master_secret(s,
1177                                         s->session->master_key,
1178                                         tmp_buf, sizeof tmp_buf);
1179
1180                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1181                         OPENSSL_cleanse(epms, outl);
1182                         }
1183 #endif
1184 #ifndef OPENSSL_NO_DH
1185                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1186                         {
1187                         DH *dh_srvr,*dh_clnt;
1188
1189                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1190                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1191                         else
1192                                 {
1193                                 /* we get them from the cert */
1194                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1195                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1196                                 goto err;
1197                                 }
1198                         
1199                         /* generate a new random key */
1200                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1201                                 {
1202                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1203                                 goto err;
1204                                 }
1205                         if (!DH_generate_key(dh_clnt))
1206                                 {
1207                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1208                                 goto err;
1209                                 }
1210
1211                         /* use the 'p' output buffer for the DH key, but
1212                          * make sure to clear it out afterwards */
1213
1214                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1215
1216                         if (n <= 0)
1217                                 {
1218                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1219                                 goto err;
1220                                 }
1221
1222                         /* generate master key from the result */
1223                         s->session->master_key_length=
1224                                 s->method->ssl3_enc->generate_master_secret(s,
1225                                         s->session->master_key,p,n);
1226                         /* clean up */
1227                         memset(p,0,n);
1228
1229                         /* send off the data */
1230                         n=BN_num_bytes(dh_clnt->pub_key);
1231                         s2n(n,p);
1232                         BN_bn2bin(dh_clnt->pub_key,p);
1233                         n+=2;
1234
1235                         DH_free(dh_clnt);
1236
1237                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1238                         }
1239 #endif
1240 #ifndef OPENSSL_NO_ECDH 
1241                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1242                         {
1243                         const EC_GROUP *srvr_group = NULL;
1244                         EC_KEY *tkey;
1245                         int ecdh_clnt_cert = 0;
1246                         int field_size = 0;
1247
1248                         /* Did we send out the client's
1249                          * ECDH share for use in premaster
1250                          * computation as part of client certificate?
1251                          * If so, set ecdh_clnt_cert to 1.
1252                          */
1253                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
1254                                 {
1255                                 /* XXX: For now, we do not support client
1256                                  * authentication using ECDH certificates.
1257                                  * To add such support, one needs to add
1258                                  * code that checks for appropriate 
1259                                  * conditions and sets ecdh_clnt_cert to 1.
1260                                  * For example, the cert have an ECC
1261                                  * key on the same curve as the server's
1262                                  * and the key should be authorized for
1263                                  * key agreement.
1264                                  *
1265                                  * One also needs to add code in ssl3_connect
1266                                  * to skip sending the certificate verify
1267                                  * message.
1268                                  *
1269                                  * if ((s->cert->key->privatekey != NULL) &&
1270                                  *     (s->cert->key->privatekey->type ==
1271                                  *      EVP_PKEY_EC) && ...)
1272                                  * ecdh_clnt_cert = 1;
1273                                  */
1274                                 }
1275
1276                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1277                                 {
1278                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1279                                 }
1280                         else
1281                                 {
1282                                 /* Get the Server Public Key from Cert */
1283                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1284                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1285                                 if ((srvr_pub_pkey == NULL) ||
1286                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1287                                     (srvr_pub_pkey->pkey.ec == NULL))
1288                                         {
1289                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1290                                             ERR_R_INTERNAL_ERROR);
1291                                         goto err;
1292                                         }
1293
1294                                 tkey = srvr_pub_pkey->pkey.ec;
1295                                 }
1296
1297                         srvr_group   = EC_KEY_get0_group(tkey);
1298                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1299
1300                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1301                                 {
1302                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1303                                     ERR_R_INTERNAL_ERROR);
1304                                 goto err;
1305                                 }
1306
1307                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
1308                                 {
1309                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1310                                 goto err;
1311                                 }
1312
1313                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1314                                 {
1315                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1316                                 goto err;
1317                                 }
1318                         if (ecdh_clnt_cert) 
1319                                 { 
1320                                 /* Reuse key info from our certificate
1321                                  * We only need our private key to perform
1322                                  * the ECDH computation.
1323                                  */
1324                                 const BIGNUM *priv_key;
1325                                 tkey = s->cert->key->privatekey->pkey.ec;
1326                                 priv_key = EC_KEY_get0_private_key(tkey);
1327                                 if (priv_key == NULL)
1328                                         {
1329                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1330                                         goto err;
1331                                         }
1332                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1333                                         {
1334                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1335                                         goto err;
1336                                         }
1337                                 }
1338                         else 
1339                                 {
1340                                 /* Generate a new ECDH key pair */
1341                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1342                                         {
1343                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1344                                         goto err;
1345                                         }
1346                                 }
1347
1348                         /* use the 'p' output buffer for the ECDH key, but
1349                          * make sure to clear it out afterwards
1350                          */
1351
1352                         field_size = EC_GROUP_get_degree(srvr_group);
1353                         if (field_size <= 0)
1354                                 {
1355                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 
1356                                        ERR_R_ECDH_LIB);
1357                                 goto err;
1358                                 }
1359                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1360                         if (n <= 0)
1361                                 {
1362                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 
1363                                        ERR_R_ECDH_LIB);
1364                                 goto err;
1365                                 }
1366
1367                         /* generate master key from the result */
1368                         s->session->master_key_length = s->method->ssl3_enc \
1369                             -> generate_master_secret(s, 
1370                                 s->session->master_key,
1371                                 p, n);
1372
1373                         memset(p, 0, n); /* clean up */
1374
1375                         if (ecdh_clnt_cert) 
1376                                 {
1377                                 /* Send empty client key exch message */
1378                                 n = 0;
1379                                 }
1380                         else 
1381                                 {
1382                                 /* First check the size of encoding and
1383                                  * allocate memory accordingly.
1384                                  */
1385                                 encoded_pt_len = 
1386                                     EC_POINT_point2oct(srvr_group, 
1387                                         EC_KEY_get0_public_key(clnt_ecdh), 
1388                                         POINT_CONVERSION_UNCOMPRESSED, 
1389                                         NULL, 0, NULL);
1390
1391                                 encodedPoint = (unsigned char *) 
1392                                     OPENSSL_malloc(encoded_pt_len * 
1393                                         sizeof(unsigned char)); 
1394                                 bn_ctx = BN_CTX_new();
1395                                 if ((encodedPoint == NULL) || 
1396                                     (bn_ctx == NULL)) 
1397                                         {
1398                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1399                                         goto err;
1400                                         }
1401
1402                                 /* Encode the public key */
1403                                 n = EC_POINT_point2oct(srvr_group, 
1404                                     EC_KEY_get0_public_key(clnt_ecdh), 
1405                                     POINT_CONVERSION_UNCOMPRESSED, 
1406                                     encodedPoint, encoded_pt_len, bn_ctx);
1407
1408                                 *p = n; /* length of encoded point */
1409                                 /* Encoded point will be copied here */
1410                                 p += 1; 
1411                                 /* copy the point */
1412                                 memcpy((unsigned char *)p, encodedPoint, n);
1413                                 /* increment n to account for length field */
1414                                 n += 1; 
1415                                 }
1416
1417                         /* Free allocated memory */
1418                         BN_CTX_free(bn_ctx);
1419                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1420                         if (clnt_ecdh != NULL) 
1421                                  EC_KEY_free(clnt_ecdh);
1422                         EVP_PKEY_free(srvr_pub_pkey);
1423                         }
1424 #endif /* !OPENSSL_NO_ECDH */
1425
1426 #ifndef OPENSSL_NO_PSK
1427                 else if (alg_k & SSL_kPSK)
1428                         {
1429                         char identity[PSK_MAX_IDENTITY_LEN];
1430                         unsigned char *t = NULL;
1431                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1432                         unsigned int pre_ms_len = 0, psk_len = 0;
1433                         int psk_err = 1;
1434
1435                         n = 0;
1436                         if (s->psk_client_callback == NULL)
1437                                 {
1438                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1439                                         SSL_R_PSK_NO_CLIENT_CB);
1440                                 goto err;
1441                                 }
1442
1443                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1444                                 identity, PSK_MAX_IDENTITY_LEN,
1445                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1446                         if (psk_len > PSK_MAX_PSK_LEN)
1447                                 {
1448                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1449                                         ERR_R_INTERNAL_ERROR);
1450                                 goto psk_err;
1451                                 }
1452                         else if (psk_len == 0)
1453                                 {
1454                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1455                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1456                                 goto psk_err;
1457                                 }
1458
1459                         /* create PSK pre_master_secret */
1460                         pre_ms_len = 2+psk_len+2+psk_len;
1461                         t = psk_or_pre_ms;
1462                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1463                         s2n(psk_len, t);
1464                         memset(t, 0, psk_len);
1465                         t+=psk_len;
1466                         s2n(psk_len, t);
1467
1468                         if (s->session->psk_identity_hint != NULL)
1469                                 OPENSSL_free(s->session->psk_identity_hint);
1470                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1471                         if (s->ctx->psk_identity_hint != NULL &&
1472                                 s->session->psk_identity_hint == NULL)
1473                                 {
1474                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1475                                         ERR_R_MALLOC_FAILURE);
1476                                 goto psk_err;
1477                                 }
1478
1479                         if (s->session->psk_identity != NULL)
1480                                 OPENSSL_free(s->session->psk_identity);
1481                         s->session->psk_identity = BUF_strdup(identity);
1482                         if (s->session->psk_identity == NULL)
1483                                 {
1484                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1485                                         ERR_R_MALLOC_FAILURE);
1486                                 goto psk_err;
1487                                 }
1488
1489                         s->session->master_key_length =
1490                                 s->method->ssl3_enc->generate_master_secret(s,
1491                                         s->session->master_key,
1492                                         psk_or_pre_ms, pre_ms_len); 
1493                         n = strlen(identity);
1494                         s2n(n, p);
1495                         memcpy(p, identity, n);
1496                         n+=2;
1497                         psk_err = 0;
1498                 psk_err:
1499                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1500                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1501                         if (psk_err != 0)
1502                                 {
1503                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1504                                 goto err;
1505                                 }
1506                         }
1507 #endif
1508                 else
1509                         {
1510                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1511                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1512                         goto err;
1513                         }
1514                 
1515                 d = dtls1_set_message_header(s, d,
1516                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1517                 /*
1518                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1519                  l2n3(n,d);
1520                  l2n(s->d1->handshake_write_seq,d);
1521                  s->d1->handshake_write_seq++;
1522                 */
1523                 
1524                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1525                 /* number of bytes to write */
1526                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1527                 s->init_off=0;
1528
1529                 /* buffer the message to handle re-xmits */
1530                 dtls1_buffer_message(s, 0);
1531                 }
1532         
1533         /* SSL3_ST_CW_KEY_EXCH_B */
1534         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1535 err:
1536 #ifndef OPENSSL_NO_ECDH
1537         BN_CTX_free(bn_ctx);
1538         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1539         if (clnt_ecdh != NULL) 
1540                 EC_KEY_free(clnt_ecdh);
1541         EVP_PKEY_free(srvr_pub_pkey);
1542 #endif
1543         return(-1);
1544         }
1545
1546 int dtls1_send_client_verify(SSL *s)
1547         {
1548         unsigned char *p,*d;
1549         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1550         EVP_PKEY *pkey;
1551 #ifndef OPENSSL_NO_RSA
1552         unsigned u=0;
1553 #endif
1554         unsigned long n;
1555 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1556         int j;
1557 #endif
1558
1559         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1560                 {
1561                 d=(unsigned char *)s->init_buf->data;
1562                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1563                 pkey=s->cert->key->privatekey;
1564
1565                 s->method->ssl3_enc->cert_verify_mac(s,
1566                 NID_sha1,
1567                         &(data[MD5_DIGEST_LENGTH]));
1568
1569 #ifndef OPENSSL_NO_RSA
1570                 if (pkey->type == EVP_PKEY_RSA)
1571                         {
1572                         s->method->ssl3_enc->cert_verify_mac(s,
1573                                 NID_md5,
1574                                 &(data[0]));
1575                         if (RSA_sign(NID_md5_sha1, data,
1576                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1577                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1578                                 {
1579                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1580                                 goto err;
1581                                 }
1582                         s2n(u,p);
1583                         n=u+2;
1584                         }
1585                 else
1586 #endif
1587 #ifndef OPENSSL_NO_DSA
1588                         if (pkey->type == EVP_PKEY_DSA)
1589                         {
1590                         if (!DSA_sign(pkey->save_type,
1591                                 &(data[MD5_DIGEST_LENGTH]),
1592                                 SHA_DIGEST_LENGTH,&(p[2]),
1593                                 (unsigned int *)&j,pkey->pkey.dsa))
1594                                 {
1595                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1596                                 goto err;
1597                                 }
1598                         s2n(j,p);
1599                         n=j+2;
1600                         }
1601                 else
1602 #endif
1603 #ifndef OPENSSL_NO_ECDSA
1604                         if (pkey->type == EVP_PKEY_EC)
1605                         {
1606                         if (!ECDSA_sign(pkey->save_type,
1607                                 &(data[MD5_DIGEST_LENGTH]),
1608                                 SHA_DIGEST_LENGTH,&(p[2]),
1609                                 (unsigned int *)&j,pkey->pkey.ec))
1610                                 {
1611                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1612                                     ERR_R_ECDSA_LIB);
1613                                 goto err;
1614                                 }
1615                         s2n(j,p);
1616                         n=j+2;
1617                         }
1618                 else
1619 #endif
1620                         {
1621                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1622                         goto err;
1623                         }
1624
1625                 d = dtls1_set_message_header(s, d,
1626                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1627
1628                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1629                 s->init_off=0;
1630
1631                 /* buffer the message to handle re-xmits */
1632                 dtls1_buffer_message(s, 0);
1633
1634                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1635                 }
1636
1637         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1638         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1639 err:
1640         return(-1);
1641         }
1642
1643 int dtls1_send_client_certificate(SSL *s)
1644         {
1645         X509 *x509=NULL;
1646         EVP_PKEY *pkey=NULL;
1647         int i;
1648         unsigned long l;
1649
1650         if (s->state == SSL3_ST_CW_CERT_A)
1651                 {
1652                 if ((s->cert == NULL) ||
1653                         (s->cert->key->x509 == NULL) ||
1654                         (s->cert->key->privatekey == NULL))
1655                         s->state=SSL3_ST_CW_CERT_B;
1656                 else
1657                         s->state=SSL3_ST_CW_CERT_C;
1658                 }
1659
1660         /* We need to get a client cert */
1661         if (s->state == SSL3_ST_CW_CERT_B)
1662                 {
1663                 /* If we get an error, we need to
1664                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1665                  * We then get retied later */
1666                 i=0;
1667                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1668                 if (i < 0)
1669                         {
1670                         s->rwstate=SSL_X509_LOOKUP;
1671                         return(-1);
1672                         }
1673                 s->rwstate=SSL_NOTHING;
1674                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1675                         {
1676                         s->state=SSL3_ST_CW_CERT_B;
1677                         if (    !SSL_use_certificate(s,x509) ||
1678                                 !SSL_use_PrivateKey(s,pkey))
1679                                 i=0;
1680                         }
1681                 else if (i == 1)
1682                         {
1683                         i=0;
1684                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1685                         }
1686
1687                 if (x509 != NULL) X509_free(x509);
1688                 if (pkey != NULL) EVP_PKEY_free(pkey);
1689                 if (i == 0)
1690                         {
1691                         if (s->version == SSL3_VERSION)
1692                                 {
1693                                 s->s3->tmp.cert_req=0;
1694                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1695                                 return(1);
1696                                 }
1697                         else
1698                                 {
1699                                 s->s3->tmp.cert_req=2;
1700                                 }
1701                         }
1702
1703                 /* Ok, we have a cert */
1704                 s->state=SSL3_ST_CW_CERT_C;
1705                 }
1706
1707         if (s->state == SSL3_ST_CW_CERT_C)
1708                 {
1709                 s->state=SSL3_ST_CW_CERT_D;
1710                 l=dtls1_output_cert_chain(s,
1711                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1712                 s->init_num=(int)l;
1713                 s->init_off=0;
1714
1715                 /* set header called by dtls1_output_cert_chain() */
1716
1717                 /* buffer the message to handle re-xmits */
1718                 dtls1_buffer_message(s, 0);
1719                 }
1720         /* SSL3_ST_CW_CERT_D */
1721         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1722         }
1723
1724