evp: prevent underflow in base64 decoding
[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                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
880                         {
881                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
882                         goto err;
883                         }
884 #endif          
885
886                 l=(p-d);
887                 d=buf;
888
889                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
890
891                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
892                 /* number of bytes to write */
893                 s->init_num=p-buf;
894                 s->init_off=0;
895
896                 /* buffer the message to handle re-xmits */
897                 dtls1_buffer_message(s, 0);
898                 }
899
900         /* SSL3_ST_CW_CLNT_HELLO_B */
901         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
902 err:
903         return(-1);
904         }
905
906 static int dtls1_get_hello_verify(SSL *s)
907         {
908         int n, al, ok = 0;
909         unsigned char *data;
910         unsigned int cookie_len;
911
912         n=s->method->ssl_get_message(s,
913                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
914                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
915                 -1,
916                 s->max_cert_list,
917                 &ok);
918
919         if (!ok) return((int)n);
920
921         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
922                 {
923                 s->d1->send_cookie = 0;
924                 s->s3->tmp.reuse_message=1;
925                 return(1);
926                 }
927
928         data = (unsigned char *)s->init_msg;
929
930         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
931                 {
932                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
933                 s->version=(s->version&0xff00)|data[1];
934                 al = SSL_AD_PROTOCOL_VERSION;
935                 goto f_err;
936                 }
937         data+=2;
938
939         cookie_len = *(data++);
940         if ( cookie_len > sizeof(s->d1->cookie))
941                 {
942                 al=SSL_AD_ILLEGAL_PARAMETER;
943                 goto f_err;
944                 }
945
946         memcpy(s->d1->cookie, data, cookie_len);
947         s->d1->cookie_len = cookie_len;
948
949         s->d1->send_cookie = 1;
950         return 1;
951
952 f_err:
953         ssl3_send_alert(s, SSL3_AL_FATAL, al);
954         return -1;
955         }
956
957 int dtls1_send_client_key_exchange(SSL *s)
958         {
959         unsigned char *p,*d;
960         int n;
961         unsigned long alg_k;
962 #ifndef OPENSSL_NO_RSA
963         unsigned char *q;
964         EVP_PKEY *pkey=NULL;
965 #endif
966 #ifndef OPENSSL_NO_KRB5
967         KSSL_ERR kssl_err;
968 #endif /* OPENSSL_NO_KRB5 */
969 #ifndef OPENSSL_NO_ECDH
970         EC_KEY *clnt_ecdh = NULL;
971         const EC_POINT *srvr_ecpoint = NULL;
972         EVP_PKEY *srvr_pub_pkey = NULL;
973         unsigned char *encodedPoint = NULL;
974         int encoded_pt_len = 0;
975         BN_CTX * bn_ctx = NULL;
976 #endif
977
978         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
979                 {
980                 d=(unsigned char *)s->init_buf->data;
981                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
982                 
983                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
984
985                 /* Fool emacs indentation */
986                 if (0) {}
987 #ifndef OPENSSL_NO_RSA
988                 else if (alg_k & SSL_kRSA)
989                         {
990                         RSA *rsa;
991                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
992
993                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
994                                 rsa=s->session->sess_cert->peer_rsa_tmp;
995                         else
996                                 {
997                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
998                                 if ((pkey == NULL) ||
999                                         (pkey->type != EVP_PKEY_RSA) ||
1000                                         (pkey->pkey.rsa == NULL))
1001                                         {
1002                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1003                                         goto err;
1004                                         }
1005                                 rsa=pkey->pkey.rsa;
1006                                 EVP_PKEY_free(pkey);
1007                                 }
1008                                 
1009                         tmp_buf[0]=s->client_version>>8;
1010                         tmp_buf[1]=s->client_version&0xff;
1011                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1012                                         goto err;
1013
1014                         s->session->master_key_length=sizeof tmp_buf;
1015
1016                         q=p;
1017                         /* Fix buf for TLS and [incidentally] DTLS */
1018                         if (s->version > SSL3_VERSION)
1019                                 p+=2;
1020                         n=RSA_public_encrypt(sizeof tmp_buf,
1021                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1022 #ifdef PKCS1_CHECK
1023                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1024                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1025 #endif
1026                         if (n <= 0)
1027                                 {
1028                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1029                                 goto err;
1030                                 }
1031
1032                         /* Fix buf for TLS and [incidentally] DTLS */
1033                         if (s->version > SSL3_VERSION)
1034                                 {
1035                                 s2n(n,q);
1036                                 n+=2;
1037                                 }
1038
1039                         s->session->master_key_length=
1040                                 s->method->ssl3_enc->generate_master_secret(s,
1041                                         s->session->master_key,
1042                                         tmp_buf,sizeof tmp_buf);
1043                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1044                         }
1045 #endif
1046 #ifndef OPENSSL_NO_KRB5
1047                 else if (alg_k & SSL_kKRB5)
1048                         {
1049                         krb5_error_code krb5rc;
1050                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1051                         /*  krb5_data   krb5_ap_req;  */
1052                         krb5_data       *enc_ticket;
1053                         krb5_data       authenticator, *authp = NULL;
1054                         EVP_CIPHER_CTX  ciph_ctx;
1055                         const EVP_CIPHER *enc = NULL;
1056                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1057                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1058                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
1059                                                 + EVP_MAX_IV_LENGTH];
1060                         int             padl, outl = sizeof(epms);
1061
1062                         EVP_CIPHER_CTX_init(&ciph_ctx);
1063
1064 #ifdef KSSL_DEBUG
1065                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1066                                 alg_k, SSL_kKRB5);
1067 #endif  /* KSSL_DEBUG */
1068
1069                         authp = NULL;
1070 #ifdef KRB5SENDAUTH
1071                         if (KRB5SENDAUTH)  authp = &authenticator;
1072 #endif  /* KRB5SENDAUTH */
1073
1074                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
1075                                 &kssl_err);
1076                         enc = kssl_map_enc(kssl_ctx->enctype);
1077                         if (enc == NULL)
1078                             goto err;
1079 #ifdef KSSL_DEBUG
1080                         {
1081                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
1082                         if (krb5rc && kssl_err.text)
1083                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
1084                         }
1085 #endif  /* KSSL_DEBUG */
1086
1087                         if (krb5rc)
1088                                 {
1089                                 ssl3_send_alert(s,SSL3_AL_FATAL,
1090                                                 SSL_AD_HANDSHAKE_FAILURE);
1091                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1092                                                 kssl_err.reason);
1093                                 goto err;
1094                                 }
1095
1096                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
1097                         **  in place of RFC 2712 KerberosWrapper, as in:
1098                         **
1099                         **  Send ticket (copy to *p, set n = length)
1100                         **  n = krb5_ap_req.length;
1101                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
1102                         **  if (krb5_ap_req.data)  
1103                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
1104                         **
1105                         **  Now using real RFC 2712 KerberosWrapper
1106                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
1107                         **  Note: 2712 "opaque" types are here replaced
1108                         **  with a 2-byte length followed by the value.
1109                         **  Example:
1110                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
1111                         **  Where "xx xx" = length bytes.  Shown here with
1112                         **  optional authenticator omitted.
1113                         */
1114
1115                         /*  KerberosWrapper.Ticket              */
1116                         s2n(enc_ticket->length,p);
1117                         memcpy(p, enc_ticket->data, enc_ticket->length);
1118                         p+= enc_ticket->length;
1119                         n = enc_ticket->length + 2;
1120
1121                         /*  KerberosWrapper.Authenticator       */
1122                         if (authp  &&  authp->length)  
1123                                 {
1124                                 s2n(authp->length,p);
1125                                 memcpy(p, authp->data, authp->length);
1126                                 p+= authp->length;
1127                                 n+= authp->length + 2;
1128                                 
1129                                 free(authp->data);
1130                                 authp->data = NULL;
1131                                 authp->length = 0;
1132                                 }
1133                         else
1134                                 {
1135                                 s2n(0,p);/*  null authenticator length  */
1136                                 n+=2;
1137                                 }
1138  
1139                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
1140                             goto err;
1141
1142                         /*  20010420 VRS.  Tried it this way; failed.
1143                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
1144                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
1145                         **                              kssl_ctx->length);
1146                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
1147                         */
1148
1149                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
1150                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
1151                                 kssl_ctx->key,iv);
1152                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
1153                                 sizeof tmp_buf);
1154                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
1155                         outl += padl;
1156                         if (outl > (int)sizeof epms)
1157                                 {
1158                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1159                                 goto err;
1160                                 }
1161                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1162
1163                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
1164                         s2n(outl,p);
1165                         memcpy(p, epms, outl);
1166                         p+=outl;
1167                         n+=outl + 2;
1168
1169                         s->session->master_key_length=
1170                                 s->method->ssl3_enc->generate_master_secret(s,
1171                                         s->session->master_key,
1172                                         tmp_buf, sizeof tmp_buf);
1173
1174                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
1175                         OPENSSL_cleanse(epms, outl);
1176                         }
1177 #endif
1178 #ifndef OPENSSL_NO_DH
1179                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1180                         {
1181                         DH *dh_srvr,*dh_clnt;
1182
1183                         if (s->session->sess_cert->peer_dh_tmp != NULL)
1184                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1185                         else
1186                                 {
1187                                 /* we get them from the cert */
1188                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1189                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1190                                 goto err;
1191                                 }
1192                         
1193                         /* generate a new random key */
1194                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1195                                 {
1196                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1197                                 goto err;
1198                                 }
1199                         if (!DH_generate_key(dh_clnt))
1200                                 {
1201                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1202                                 goto err;
1203                                 }
1204
1205                         /* use the 'p' output buffer for the DH key, but
1206                          * make sure to clear it out afterwards */
1207
1208                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1209
1210                         if (n <= 0)
1211                                 {
1212                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1213                                 goto err;
1214                                 }
1215
1216                         /* generate master key from the result */
1217                         s->session->master_key_length=
1218                                 s->method->ssl3_enc->generate_master_secret(s,
1219                                         s->session->master_key,p,n);
1220                         /* clean up */
1221                         memset(p,0,n);
1222
1223                         /* send off the data */
1224                         n=BN_num_bytes(dh_clnt->pub_key);
1225                         s2n(n,p);
1226                         BN_bn2bin(dh_clnt->pub_key,p);
1227                         n+=2;
1228
1229                         DH_free(dh_clnt);
1230
1231                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
1232                         }
1233 #endif
1234 #ifndef OPENSSL_NO_ECDH 
1235                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1236                         {
1237                         const EC_GROUP *srvr_group = NULL;
1238                         EC_KEY *tkey;
1239                         int ecdh_clnt_cert = 0;
1240                         int field_size = 0;
1241
1242                         /* Did we send out the client's
1243                          * ECDH share for use in premaster
1244                          * computation as part of client certificate?
1245                          * If so, set ecdh_clnt_cert to 1.
1246                          */
1247                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL)) 
1248                                 {
1249                                 /* XXX: For now, we do not support client
1250                                  * authentication using ECDH certificates.
1251                                  * To add such support, one needs to add
1252                                  * code that checks for appropriate 
1253                                  * conditions and sets ecdh_clnt_cert to 1.
1254                                  * For example, the cert have an ECC
1255                                  * key on the same curve as the server's
1256                                  * and the key should be authorized for
1257                                  * key agreement.
1258                                  *
1259                                  * One also needs to add code in ssl3_connect
1260                                  * to skip sending the certificate verify
1261                                  * message.
1262                                  *
1263                                  * if ((s->cert->key->privatekey != NULL) &&
1264                                  *     (s->cert->key->privatekey->type ==
1265                                  *      EVP_PKEY_EC) && ...)
1266                                  * ecdh_clnt_cert = 1;
1267                                  */
1268                                 }
1269
1270                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1271                                 {
1272                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
1273                                 }
1274                         else
1275                                 {
1276                                 /* Get the Server Public Key from Cert */
1277                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1278                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1279                                 if ((srvr_pub_pkey == NULL) ||
1280                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1281                                     (srvr_pub_pkey->pkey.ec == NULL))
1282                                         {
1283                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1284                                             ERR_R_INTERNAL_ERROR);
1285                                         goto err;
1286                                         }
1287
1288                                 tkey = srvr_pub_pkey->pkey.ec;
1289                                 }
1290
1291                         srvr_group   = EC_KEY_get0_group(tkey);
1292                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1293
1294                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1295                                 {
1296                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1297                                     ERR_R_INTERNAL_ERROR);
1298                                 goto err;
1299                                 }
1300
1301                         if ((clnt_ecdh=EC_KEY_new()) == NULL) 
1302                                 {
1303                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1304                                 goto err;
1305                                 }
1306
1307                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1308                                 {
1309                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1310                                 goto err;
1311                                 }
1312                         if (ecdh_clnt_cert) 
1313                                 { 
1314                                 /* Reuse key info from our certificate
1315                                  * We only need our private key to perform
1316                                  * the ECDH computation.
1317                                  */
1318                                 const BIGNUM *priv_key;
1319                                 tkey = s->cert->key->privatekey->pkey.ec;
1320                                 priv_key = EC_KEY_get0_private_key(tkey);
1321                                 if (priv_key == NULL)
1322                                         {
1323                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1324                                         goto err;
1325                                         }
1326                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1327                                         {
1328                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1329                                         goto err;
1330                                         }
1331                                 }
1332                         else 
1333                                 {
1334                                 /* Generate a new ECDH key pair */
1335                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
1336                                         {
1337                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1338                                         goto err;
1339                                         }
1340                                 }
1341
1342                         /* use the 'p' output buffer for the ECDH key, but
1343                          * make sure to clear it out afterwards
1344                          */
1345
1346                         field_size = EC_GROUP_get_degree(srvr_group);
1347                         if (field_size <= 0)
1348                                 {
1349                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 
1350                                        ERR_R_ECDH_LIB);
1351                                 goto err;
1352                                 }
1353                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1354                         if (n <= 0)
1355                                 {
1356                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 
1357                                        ERR_R_ECDH_LIB);
1358                                 goto err;
1359                                 }
1360
1361                         /* generate master key from the result */
1362                         s->session->master_key_length = s->method->ssl3_enc \
1363                             -> generate_master_secret(s, 
1364                                 s->session->master_key,
1365                                 p, n);
1366
1367                         memset(p, 0, n); /* clean up */
1368
1369                         if (ecdh_clnt_cert) 
1370                                 {
1371                                 /* Send empty client key exch message */
1372                                 n = 0;
1373                                 }
1374                         else 
1375                                 {
1376                                 /* First check the size of encoding and
1377                                  * allocate memory accordingly.
1378                                  */
1379                                 encoded_pt_len = 
1380                                     EC_POINT_point2oct(srvr_group, 
1381                                         EC_KEY_get0_public_key(clnt_ecdh), 
1382                                         POINT_CONVERSION_UNCOMPRESSED, 
1383                                         NULL, 0, NULL);
1384
1385                                 encodedPoint = (unsigned char *) 
1386                                     OPENSSL_malloc(encoded_pt_len * 
1387                                         sizeof(unsigned char)); 
1388                                 bn_ctx = BN_CTX_new();
1389                                 if ((encodedPoint == NULL) || 
1390                                     (bn_ctx == NULL)) 
1391                                         {
1392                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1393                                         goto err;
1394                                         }
1395
1396                                 /* Encode the public key */
1397                                 n = EC_POINT_point2oct(srvr_group, 
1398                                     EC_KEY_get0_public_key(clnt_ecdh), 
1399                                     POINT_CONVERSION_UNCOMPRESSED, 
1400                                     encodedPoint, encoded_pt_len, bn_ctx);
1401
1402                                 *p = n; /* length of encoded point */
1403                                 /* Encoded point will be copied here */
1404                                 p += 1; 
1405                                 /* copy the point */
1406                                 memcpy((unsigned char *)p, encodedPoint, n);
1407                                 /* increment n to account for length field */
1408                                 n += 1; 
1409                                 }
1410
1411                         /* Free allocated memory */
1412                         BN_CTX_free(bn_ctx);
1413                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1414                         if (clnt_ecdh != NULL) 
1415                                  EC_KEY_free(clnt_ecdh);
1416                         EVP_PKEY_free(srvr_pub_pkey);
1417                         }
1418 #endif /* !OPENSSL_NO_ECDH */
1419
1420 #ifndef OPENSSL_NO_PSK
1421                 else if (alg_k & SSL_kPSK)
1422                         {
1423                         char identity[PSK_MAX_IDENTITY_LEN];
1424                         unsigned char *t = NULL;
1425                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1426                         unsigned int pre_ms_len = 0, psk_len = 0;
1427                         int psk_err = 1;
1428
1429                         n = 0;
1430                         if (s->psk_client_callback == NULL)
1431                                 {
1432                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1433                                         SSL_R_PSK_NO_CLIENT_CB);
1434                                 goto err;
1435                                 }
1436
1437                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1438                                 identity, PSK_MAX_IDENTITY_LEN,
1439                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1440                         if (psk_len > PSK_MAX_PSK_LEN)
1441                                 {
1442                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1443                                         ERR_R_INTERNAL_ERROR);
1444                                 goto psk_err;
1445                                 }
1446                         else if (psk_len == 0)
1447                                 {
1448                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1449                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
1450                                 goto psk_err;
1451                                 }
1452
1453                         /* create PSK pre_master_secret */
1454                         pre_ms_len = 2+psk_len+2+psk_len;
1455                         t = psk_or_pre_ms;
1456                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1457                         s2n(psk_len, t);
1458                         memset(t, 0, psk_len);
1459                         t+=psk_len;
1460                         s2n(psk_len, t);
1461
1462                         if (s->session->psk_identity_hint != NULL)
1463                                 OPENSSL_free(s->session->psk_identity_hint);
1464                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1465                         if (s->ctx->psk_identity_hint != NULL &&
1466                                 s->session->psk_identity_hint == NULL)
1467                                 {
1468                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1469                                         ERR_R_MALLOC_FAILURE);
1470                                 goto psk_err;
1471                                 }
1472
1473                         if (s->session->psk_identity != NULL)
1474                                 OPENSSL_free(s->session->psk_identity);
1475                         s->session->psk_identity = BUF_strdup(identity);
1476                         if (s->session->psk_identity == NULL)
1477                                 {
1478                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1479                                         ERR_R_MALLOC_FAILURE);
1480                                 goto psk_err;
1481                                 }
1482
1483                         s->session->master_key_length =
1484                                 s->method->ssl3_enc->generate_master_secret(s,
1485                                         s->session->master_key,
1486                                         psk_or_pre_ms, pre_ms_len); 
1487                         n = strlen(identity);
1488                         s2n(n, p);
1489                         memcpy(p, identity, n);
1490                         n+=2;
1491                         psk_err = 0;
1492                 psk_err:
1493                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1494                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1495                         if (psk_err != 0)
1496                                 {
1497                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1498                                 goto err;
1499                                 }
1500                         }
1501 #endif
1502                 else
1503                         {
1504                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1505                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1506                         goto err;
1507                         }
1508                 
1509                 d = dtls1_set_message_header(s, d,
1510                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1511                 /*
1512                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1513                  l2n3(n,d);
1514                  l2n(s->d1->handshake_write_seq,d);
1515                  s->d1->handshake_write_seq++;
1516                 */
1517                 
1518                 s->state=SSL3_ST_CW_KEY_EXCH_B;
1519                 /* number of bytes to write */
1520                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1521                 s->init_off=0;
1522
1523                 /* buffer the message to handle re-xmits */
1524                 dtls1_buffer_message(s, 0);
1525                 }
1526         
1527         /* SSL3_ST_CW_KEY_EXCH_B */
1528         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1529 err:
1530 #ifndef OPENSSL_NO_ECDH
1531         BN_CTX_free(bn_ctx);
1532         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1533         if (clnt_ecdh != NULL) 
1534                 EC_KEY_free(clnt_ecdh);
1535         EVP_PKEY_free(srvr_pub_pkey);
1536 #endif
1537         return(-1);
1538         }
1539
1540 int dtls1_send_client_verify(SSL *s)
1541         {
1542         unsigned char *p,*d;
1543         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1544         EVP_PKEY *pkey;
1545 #ifndef OPENSSL_NO_RSA
1546         unsigned u=0;
1547 #endif
1548         unsigned long n;
1549 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1550         int j;
1551 #endif
1552
1553         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1554                 {
1555                 d=(unsigned char *)s->init_buf->data;
1556                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1557                 pkey=s->cert->key->privatekey;
1558
1559                 s->method->ssl3_enc->cert_verify_mac(s,
1560                 NID_sha1,
1561                         &(data[MD5_DIGEST_LENGTH]));
1562
1563 #ifndef OPENSSL_NO_RSA
1564                 if (pkey->type == EVP_PKEY_RSA)
1565                         {
1566                         s->method->ssl3_enc->cert_verify_mac(s,
1567                                 NID_md5,
1568                                 &(data[0]));
1569                         if (RSA_sign(NID_md5_sha1, data,
1570                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1571                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1572                                 {
1573                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1574                                 goto err;
1575                                 }
1576                         s2n(u,p);
1577                         n=u+2;
1578                         }
1579                 else
1580 #endif
1581 #ifndef OPENSSL_NO_DSA
1582                         if (pkey->type == EVP_PKEY_DSA)
1583                         {
1584                         if (!DSA_sign(pkey->save_type,
1585                                 &(data[MD5_DIGEST_LENGTH]),
1586                                 SHA_DIGEST_LENGTH,&(p[2]),
1587                                 (unsigned int *)&j,pkey->pkey.dsa))
1588                                 {
1589                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1590                                 goto err;
1591                                 }
1592                         s2n(j,p);
1593                         n=j+2;
1594                         }
1595                 else
1596 #endif
1597 #ifndef OPENSSL_NO_ECDSA
1598                         if (pkey->type == EVP_PKEY_EC)
1599                         {
1600                         if (!ECDSA_sign(pkey->save_type,
1601                                 &(data[MD5_DIGEST_LENGTH]),
1602                                 SHA_DIGEST_LENGTH,&(p[2]),
1603                                 (unsigned int *)&j,pkey->pkey.ec))
1604                                 {
1605                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1606                                     ERR_R_ECDSA_LIB);
1607                                 goto err;
1608                                 }
1609                         s2n(j,p);
1610                         n=j+2;
1611                         }
1612                 else
1613 #endif
1614                         {
1615                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1616                         goto err;
1617                         }
1618
1619                 d = dtls1_set_message_header(s, d,
1620                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1621
1622                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1623                 s->init_off=0;
1624
1625                 /* buffer the message to handle re-xmits */
1626                 dtls1_buffer_message(s, 0);
1627
1628                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1629                 }
1630
1631         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1632         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1633 err:
1634         return(-1);
1635         }
1636
1637 int dtls1_send_client_certificate(SSL *s)
1638         {
1639         X509 *x509=NULL;
1640         EVP_PKEY *pkey=NULL;
1641         int i;
1642         unsigned long l;
1643
1644         if (s->state == SSL3_ST_CW_CERT_A)
1645                 {
1646                 if ((s->cert == NULL) ||
1647                         (s->cert->key->x509 == NULL) ||
1648                         (s->cert->key->privatekey == NULL))
1649                         s->state=SSL3_ST_CW_CERT_B;
1650                 else
1651                         s->state=SSL3_ST_CW_CERT_C;
1652                 }
1653
1654         /* We need to get a client cert */
1655         if (s->state == SSL3_ST_CW_CERT_B)
1656                 {
1657                 /* If we get an error, we need to
1658                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1659                  * We then get retied later */
1660                 i=0;
1661                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1662                 if (i < 0)
1663                         {
1664                         s->rwstate=SSL_X509_LOOKUP;
1665                         return(-1);
1666                         }
1667                 s->rwstate=SSL_NOTHING;
1668                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1669                         {
1670                         s->state=SSL3_ST_CW_CERT_B;
1671                         if (    !SSL_use_certificate(s,x509) ||
1672                                 !SSL_use_PrivateKey(s,pkey))
1673                                 i=0;
1674                         }
1675                 else if (i == 1)
1676                         {
1677                         i=0;
1678                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1679                         }
1680
1681                 if (x509 != NULL) X509_free(x509);
1682                 if (pkey != NULL) EVP_PKEY_free(pkey);
1683                 if (i == 0)
1684                         {
1685                         if (s->version == SSL3_VERSION)
1686                                 {
1687                                 s->s3->tmp.cert_req=0;
1688                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1689                                 return(1);
1690                                 }
1691                         else
1692                                 {
1693                                 s->s3->tmp.cert_req=2;
1694                                 }
1695                         }
1696
1697                 /* Ok, we have a cert */
1698                 s->state=SSL3_ST_CW_CERT_C;
1699                 }
1700
1701         if (s->state == SSL3_ST_CW_CERT_C)
1702                 {
1703                 s->state=SSL3_ST_CW_CERT_D;
1704                 l=dtls1_output_cert_chain(s,
1705                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1706                 s->init_num=(int)l;
1707                 s->init_off=0;
1708
1709                 /* set header called by dtls1_output_cert_chain() */
1710
1711                 /* buffer the message to handle re-xmits */
1712                 dtls1_buffer_message(s, 0);
1713                 }
1714         /* SSL3_ST_CW_CERT_D */
1715         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1716         }
1717
1718