7b38da0b7c94100a7d7e9e40f8fb54628236f325
[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) 1999-2005 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 #include <openssl/buffer.h>
119 #include <openssl/rand.h>
120 #include <openssl/objects.h>
121 #include <openssl/evp.h>
122 #include <openssl/md5.h>
123 #include <openssl/bn.h>
124 #ifndef OPENSSL_NO_DH
125 #include <openssl/dh.h>
126 #endif
127
128 static const SSL_METHOD *dtls1_get_client_method(int ver);
129 static int dtls1_get_hello_verify(SSL *s);
130
131 static const SSL_METHOD *dtls1_get_client_method(int ver)
132         {
133         if (ver == DTLS1_VERSION)
134                 return(DTLSv1_client_method());
135         else
136                 return(NULL);
137         }
138
139 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
140                         ssl_undefined_function,
141                         dtls1_connect,
142                         dtls1_get_client_method)
143
144 int dtls1_connect(SSL *s)
145         {
146         BUF_MEM *buf=NULL;
147         unsigned long Time=time(NULL),l;
148         long num1;
149         void (*cb)(const SSL *ssl,int type,int val)=NULL;
150         int ret= -1;
151         int new_state,state,skip=0;;
152
153         RAND_add(&Time,sizeof(Time),0);
154         ERR_clear_error();
155         clear_sys_error();
156
157         if (s->info_callback != NULL)
158                 cb=s->info_callback;
159         else if (s->ctx->info_callback != NULL)
160                 cb=s->ctx->info_callback;
161         
162         s->in_handshake++;
163         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
164
165         for (;;)
166                 {
167                 state=s->state;
168
169                 switch(s->state)
170                         {
171                 case SSL_ST_RENEGOTIATE:
172                         s->new_session=1;
173                         s->state=SSL_ST_CONNECT;
174                         s->ctx->stats.sess_connect_renegotiate++;
175                         /* break */
176                 case SSL_ST_BEFORE:
177                 case SSL_ST_CONNECT:
178                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
179                 case SSL_ST_OK|SSL_ST_CONNECT:
180
181                         s->server=0;
182                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
183
184                         if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00))
185                                 {
186                                 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
187                                 ret = -1;
188                                 goto end;
189                                 }
190                                 
191                         /* s->version=SSL3_VERSION; */
192                         s->type=SSL_ST_CONNECT;
193
194                         if (s->init_buf == NULL)
195                                 {
196                                 if ((buf=BUF_MEM_new()) == NULL)
197                                         {
198                                         ret= -1;
199                                         goto end;
200                                         }
201                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
202                                         {
203                                         ret= -1;
204                                         goto end;
205                                         }
206                                 s->init_buf=buf;
207                                 buf=NULL;
208                                 }
209
210                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
211
212                         /* setup buffing BIO */
213                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
214
215                         /* don't push the buffering BIO quite yet */
216
217                         ssl3_init_finished_mac(s);
218
219                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
220                         s->ctx->stats.sess_connect++;
221                         s->init_num=0;
222                         break;
223
224                 case SSL3_ST_CW_CLNT_HELLO_A:
225                 case SSL3_ST_CW_CLNT_HELLO_B:
226
227                         s->shutdown=0;
228                         ret=dtls1_client_hello(s);
229                         if (ret <= 0) goto end;
230
231                         if ( s->d1->send_cookie)
232                                 {
233                                 s->state=SSL3_ST_CW_FLUSH;
234                                 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
235                                 }
236                         else
237                                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
238
239                         s->init_num=0;
240
241                         /* turn on buffering for the next lot of output */
242                         if (s->bbio != s->wbio)
243                                 s->wbio=BIO_push(s->bbio,s->wbio);
244
245                         break;
246
247                 case SSL3_ST_CR_SRVR_HELLO_A:
248                 case SSL3_ST_CR_SRVR_HELLO_B:
249                         ret=ssl3_get_server_hello(s);
250                         if (ret <= 0) goto end;
251                         else
252                                 {
253                                 if (s->hit)
254                                         s->state=SSL3_ST_CR_FINISHED_A;
255                                 else
256                                         s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
257                                 }
258                         s->init_num=0;
259                         break;
260
261                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
262                 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
263
264                         ret = dtls1_get_hello_verify(s);
265                         if ( ret <= 0)
266                                 goto end;
267                         if ( s->d1->send_cookie) /* start again, with a cookie */
268                                 s->state=SSL3_ST_CW_CLNT_HELLO_A;
269                         else
270                                 s->state = SSL3_ST_CR_CERT_A;
271                         s->init_num = 0;
272                         break;
273
274                 case SSL3_ST_CR_CERT_A:
275                 case SSL3_ST_CR_CERT_B:
276                         /* Check if it is anon DH */
277                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
278                                 {
279                                 ret=ssl3_get_server_certificate(s);
280                                 if (ret <= 0) goto end;
281                                 }
282                         else
283                                 skip=1;
284                         s->state=SSL3_ST_CR_KEY_EXCH_A;
285                         s->init_num=0;
286                         break;
287
288                 case SSL3_ST_CR_KEY_EXCH_A:
289                 case SSL3_ST_CR_KEY_EXCH_B:
290                         ret=ssl3_get_key_exchange(s);
291                         if (ret <= 0) goto end;
292                         s->state=SSL3_ST_CR_CERT_REQ_A;
293                         s->init_num=0;
294
295                         /* at this point we check that we have the
296                          * required stuff from the server */
297                         if (!ssl3_check_cert_and_algorithm(s))
298                                 {
299                                 ret= -1;
300                                 goto end;
301                                 }
302                         break;
303
304                 case SSL3_ST_CR_CERT_REQ_A:
305                 case SSL3_ST_CR_CERT_REQ_B:
306                         ret=ssl3_get_certificate_request(s);
307                         if (ret <= 0) goto end;
308                         s->state=SSL3_ST_CR_SRVR_DONE_A;
309                         s->init_num=0;
310                         break;
311
312                 case SSL3_ST_CR_SRVR_DONE_A:
313                 case SSL3_ST_CR_SRVR_DONE_B:
314                         ret=ssl3_get_server_done(s);
315                         if (ret <= 0) goto end;
316                         if (s->s3->tmp.cert_req)
317                                 s->state=SSL3_ST_CW_CERT_A;
318                         else
319                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
320                         s->init_num=0;
321
322                         break;
323
324                 case SSL3_ST_CW_CERT_A:
325                 case SSL3_ST_CW_CERT_B:
326                 case SSL3_ST_CW_CERT_C:
327                 case SSL3_ST_CW_CERT_D:
328                         ret=dtls1_send_client_certificate(s);
329                         if (ret <= 0) goto end;
330                         s->state=SSL3_ST_CW_KEY_EXCH_A;
331                         s->init_num=0;
332                         break;
333
334                 case SSL3_ST_CW_KEY_EXCH_A:
335                 case SSL3_ST_CW_KEY_EXCH_B:
336                         ret=dtls1_send_client_key_exchange(s);
337                         if (ret <= 0) goto end;
338                         l=s->s3->tmp.new_cipher->algorithms;
339                         /* EAY EAY EAY need to check for DH fix cert
340                          * sent back */
341                         /* For TLS, cert_req is set to 2, so a cert chain
342                          * of nothing is sent, but no verify packet is sent */
343                         if (s->s3->tmp.cert_req == 1)
344                                 {
345                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
346                                 }
347                         else
348                                 {
349                                 s->state=SSL3_ST_CW_CHANGE_A;
350                                 s->s3->change_cipher_spec=0;
351                                 }
352
353                         s->init_num=0;
354                         break;
355
356                 case SSL3_ST_CW_CERT_VRFY_A:
357                 case SSL3_ST_CW_CERT_VRFY_B:
358                         ret=dtls1_send_client_verify(s);
359                         if (ret <= 0) goto end;
360                         s->state=SSL3_ST_CW_CHANGE_A;
361                         s->init_num=0;
362                         s->s3->change_cipher_spec=0;
363                         break;
364
365                 case SSL3_ST_CW_CHANGE_A:
366                 case SSL3_ST_CW_CHANGE_B:
367                         ret=dtls1_send_change_cipher_spec(s,
368                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
369                         if (ret <= 0) goto end;
370                         s->state=SSL3_ST_CW_FINISHED_A;
371                         s->init_num=0;
372
373                         s->session->cipher=s->s3->tmp.new_cipher;
374                         if (s->s3->tmp.new_compression == NULL)
375                                 s->session->compress_meth=0;
376                         else
377                                 s->session->compress_meth=
378                                         s->s3->tmp.new_compression->id;
379                         if (!s->method->ssl3_enc->setup_key_block(s))
380                                 {
381                                 ret= -1;
382                                 goto end;
383                                 }
384
385                         if (!s->method->ssl3_enc->change_cipher_state(s,
386                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
387                                 {
388                                 ret= -1;
389                                 goto end;
390                                 }
391                         
392                         dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
393                         break;
394
395                 case SSL3_ST_CW_FINISHED_A:
396                 case SSL3_ST_CW_FINISHED_B:
397                         ret=dtls1_send_finished(s,
398                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
399                                 s->method->ssl3_enc->client_finished_label,
400                                 s->method->ssl3_enc->client_finished_label_len);
401                         if (ret <= 0) goto end;
402                         s->state=SSL3_ST_CW_FLUSH;
403
404                         /* clear flags */
405                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
406                         if (s->hit)
407                                 {
408                                 s->s3->tmp.next_state=SSL_ST_OK;
409                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
410                                         {
411                                         s->state=SSL_ST_OK;
412                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
413                                         s->s3->delay_buf_pop_ret=0;
414                                         }
415                                 }
416                         else
417                                 {
418                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
419                                 }
420                         s->init_num=0;
421                         break;
422
423                 case SSL3_ST_CR_FINISHED_A:
424                 case SSL3_ST_CR_FINISHED_B:
425
426                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
427                                 SSL3_ST_CR_FINISHED_B);
428                         if (ret <= 0) goto end;
429
430                         if (s->hit)
431                                 s->state=SSL3_ST_CW_CHANGE_A;
432                         else
433                                 s->state=SSL_ST_OK;
434                         s->init_num=0;
435                         break;
436
437                 case SSL3_ST_CW_FLUSH:
438                         /* number of bytes to be flushed */
439                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
440                         if (num1 > 0)
441                                 {
442                                 s->rwstate=SSL_WRITING;
443                                 num1=BIO_flush(s->wbio);
444                                 if (num1 <= 0) { ret= -1; goto end; }
445                                 s->rwstate=SSL_NOTHING;
446                                 }
447
448                         s->state=s->s3->tmp.next_state;
449                         break;
450
451                 case SSL_ST_OK:
452                         /* clean a few things up */
453                         ssl3_cleanup_key_block(s);
454
455 #if 0
456                         if (s->init_buf != NULL)
457                                 {
458                                 BUF_MEM_free(s->init_buf);
459                                 s->init_buf=NULL;
460                                 }
461 #endif
462
463                         /* If we are not 'joining' the last two packets,
464                          * remove the buffering now */
465                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
466                                 ssl_free_wbio_buffer(s);
467                         /* else do it later in ssl3_write */
468
469                         s->init_num=0;
470                         s->new_session=0;
471
472                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
473                         if (s->hit) s->ctx->stats.sess_hit++;
474
475                         ret=1;
476                         /* s->server=0; */
477                         s->handshake_func=dtls1_connect;
478                         s->ctx->stats.sess_connect_good++;
479
480                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
481
482                         /* done with handshaking */
483                         s->d1->handshake_read_seq  = 0;
484                         goto end;
485                         /* break; */
486                         
487                 default:
488                         SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
489                         ret= -1;
490                         goto end;
491                         /* break; */
492                         }
493
494                 /* did we do anything */
495                 if (!s->s3->tmp.reuse_message && !skip)
496                         {
497                         if (s->debug)
498                                 {
499                                 if ((ret=BIO_flush(s->wbio)) <= 0)
500                                         goto end;
501                                 }
502
503                         if ((cb != NULL) && (s->state != state))
504                                 {
505                                 new_state=s->state;
506                                 s->state=state;
507                                 cb(s,SSL_CB_CONNECT_LOOP,1);
508                                 s->state=new_state;
509                                 }
510                         }
511                 skip=0;
512                 }
513 end:
514         s->in_handshake--;
515         if (buf != NULL)
516                 BUF_MEM_free(buf);
517         if (cb != NULL)
518                 cb(s,SSL_CB_CONNECT_EXIT,ret);
519         return(ret);
520         }
521
522 int dtls1_client_hello(SSL *s)
523         {
524         unsigned char *buf;
525         unsigned char *p,*d;
526         unsigned int i,j;
527         unsigned long Time,l;
528         SSL_COMP *comp;
529
530         buf=(unsigned char *)s->init_buf->data;
531         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
532                 {
533                 if ((s->session == NULL) ||
534                         (s->session->ssl_version != s->version) ||
535                         (s->session->not_resumable))
536                         {
537                         if (!ssl_get_new_session(s,0))
538                                 goto err;
539                         }
540                 /* else use the pre-loaded session */
541
542                 p=s->s3->client_random;
543                 Time=time(NULL);                        /* Time */
544                 l2n(Time,p);
545                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
546
547                 /* Do the message type and length last */
548                 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
549
550                 *(p++)=s->version>>8;
551                 *(p++)=s->version&0xff;
552                 s->client_version=s->version;
553
554                 /* Random stuff */
555                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
556                 p+=SSL3_RANDOM_SIZE;
557
558                 /* Session ID */
559                 if (s->new_session)
560                         i=0;
561                 else
562                         i=s->session->session_id_length;
563                 *(p++)=i;
564                 if (i != 0)
565                         {
566                         if (i > sizeof s->session->session_id)
567                                 {
568                                 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
569                                 goto err;
570                                 }
571                         memcpy(p,s->session->session_id,i);
572                         p+=i;
573                         }
574                 
575                 /* cookie stuff */
576                 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
577                         {
578                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
579                         goto err;
580                         }
581                 *(p++) = s->d1->cookie_len;
582                 memcpy(p, s->d1->cookie, s->d1->cookie_len);
583                 p += s->d1->cookie_len;
584
585                 /* Ciphers supported */
586                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
587                 if (i == 0)
588                         {
589                         SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
590                         goto err;
591                         }
592                 s2n(i,p);
593                 p+=i;
594
595                 /* COMPRESSION */
596                 if (s->ctx->comp_methods == NULL)
597                         j=0;
598                 else
599                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
600                 *(p++)=1+j;
601                 for (i=0; i<j; i++)
602                         {
603                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
604                         *(p++)=comp->id;
605                         }
606                 *(p++)=0; /* Add the NULL method */
607                 
608                 l=(p-d);
609                 d=buf;
610
611                 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
612
613                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
614                 /* number of bytes to write */
615                 s->init_num=p-buf;
616                 s->init_off=0;
617
618                 /* buffer the message to handle re-xmits */
619                 dtls1_buffer_message(s, 0);
620                 }
621
622         /* SSL3_ST_CW_CLNT_HELLO_B */
623         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
624 err:
625         return(-1);
626         }
627
628 static int dtls1_get_hello_verify(SSL *s)
629         {
630         int n, al, ok = 0;
631         unsigned char *data;
632         unsigned int cookie_len;
633
634         n=s->method->ssl_get_message(s,
635                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
636                 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
637                 -1,
638                 s->max_cert_list,
639                 &ok);
640
641         if (!ok) return((int)n);
642
643         if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
644                 {
645                 s->d1->send_cookie = 0;
646                 s->s3->tmp.reuse_message=1;
647                 return(1);
648                 }
649
650         data = (unsigned char *)s->init_msg;
651
652         if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
653                 {
654                 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
655                 s->version=(s->version&0xff00)|data[1];
656                 al = SSL_AD_PROTOCOL_VERSION;
657                 goto f_err;
658                 }
659         data+=2;
660
661         cookie_len = *(data++);
662         if ( cookie_len > sizeof(s->d1->cookie))
663                 {
664                 al=SSL_AD_ILLEGAL_PARAMETER;
665                 goto f_err;
666                 }
667
668         memcpy(s->d1->cookie, data, cookie_len);
669         s->d1->cookie_len = cookie_len;
670
671         s->d1->send_cookie = 1;
672         return 1;
673
674 f_err:
675         ssl3_send_alert(s, SSL3_AL_FATAL, al);
676         return -1;
677         }
678
679 int dtls1_send_client_key_exchange(SSL *s)
680         {
681         unsigned char *p,*d;
682         int n;
683         unsigned long l;
684 #ifndef OPENSSL_NO_RSA
685         unsigned char *q;
686         EVP_PKEY *pkey=NULL;
687 #endif
688 #ifndef OPENSSL_NO_KRB5
689         KSSL_ERR kssl_err;
690 #endif /* OPENSSL_NO_KRB5 */
691
692         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
693                 {
694                 d=(unsigned char *)s->init_buf->data;
695                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
696
697                 l=s->s3->tmp.new_cipher->algorithms;
698
699                 /* Fool emacs indentation */
700                 if (0) {}
701 #ifndef OPENSSL_NO_RSA
702                 else if (l & SSL_kRSA)
703                         {
704                         RSA *rsa;
705                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
706
707                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
708                                 rsa=s->session->sess_cert->peer_rsa_tmp;
709                         else
710                                 {
711                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
712                                 if ((pkey == NULL) ||
713                                         (pkey->type != EVP_PKEY_RSA) ||
714                                         (pkey->pkey.rsa == NULL))
715                                         {
716                                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
717                                         goto err;
718                                         }
719                                 rsa=pkey->pkey.rsa;
720                                 EVP_PKEY_free(pkey);
721                                 }
722                                 
723                         tmp_buf[0]=s->client_version>>8;
724                         tmp_buf[1]=s->client_version&0xff;
725                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
726                                         goto err;
727
728                         s->session->master_key_length=sizeof tmp_buf;
729
730                         q=p;
731                         /* Fix buf for TLS and beyond */
732                         if (s->version > SSL3_VERSION)
733                                 p+=2;
734                         n=RSA_public_encrypt(sizeof tmp_buf,
735                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
736 #ifdef PKCS1_CHECK
737                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
738                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
739 #endif
740                         if (n <= 0)
741                                 {
742                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
743                                 goto err;
744                                 }
745
746                         /* Fix buf for TLS and beyond */
747                         if (s->version > SSL3_VERSION)
748                                 {
749                                 s2n(n,q);
750                                 n+=2;
751                                 }
752
753                         s->session->master_key_length=
754                                 s->method->ssl3_enc->generate_master_secret(s,
755                                         s->session->master_key,
756                                         tmp_buf,sizeof tmp_buf);
757                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
758                         }
759 #endif
760 #ifndef OPENSSL_NO_KRB5
761                 else if (l & SSL_kKRB5)
762                         {
763                         krb5_error_code krb5rc;
764                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
765                         /*  krb5_data   krb5_ap_req;  */
766                         krb5_data       *enc_ticket;
767                         krb5_data       authenticator, *authp = NULL;
768                         EVP_CIPHER_CTX  ciph_ctx;
769                         EVP_CIPHER      *enc = NULL;
770                         unsigned char   iv[EVP_MAX_IV_LENGTH];
771                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
772                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH 
773                                                 + EVP_MAX_IV_LENGTH];
774                         int             padl, outl = sizeof(epms);
775
776                         EVP_CIPHER_CTX_init(&ciph_ctx);
777
778 #ifdef KSSL_DEBUG
779                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
780                                 l, SSL_kKRB5);
781 #endif  /* KSSL_DEBUG */
782
783                         authp = NULL;
784 #ifdef KRB5SENDAUTH
785                         if (KRB5SENDAUTH)  authp = &authenticator;
786 #endif  /* KRB5SENDAUTH */
787
788                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
789                                 &kssl_err);
790                         enc = kssl_map_enc(kssl_ctx->enctype);
791                         if (enc == NULL)
792                             goto err;
793 #ifdef KSSL_DEBUG
794                         {
795                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
796                         if (krb5rc && kssl_err.text)
797                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
798                         }
799 #endif  /* KSSL_DEBUG */
800
801                         if (krb5rc)
802                                 {
803                                 ssl3_send_alert(s,SSL3_AL_FATAL,
804                                                 SSL_AD_HANDSHAKE_FAILURE);
805                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
806                                                 kssl_err.reason);
807                                 goto err;
808                                 }
809
810                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
811                         **  in place of RFC 2712 KerberosWrapper, as in:
812                         **
813                         **  Send ticket (copy to *p, set n = length)
814                         **  n = krb5_ap_req.length;
815                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
816                         **  if (krb5_ap_req.data)  
817                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
818                         **
819                         **  Now using real RFC 2712 KerberosWrapper
820                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
821                         **  Note: 2712 "opaque" types are here replaced
822                         **  with a 2-byte length followed by the value.
823                         **  Example:
824                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
825                         **  Where "xx xx" = length bytes.  Shown here with
826                         **  optional authenticator omitted.
827                         */
828
829                         /*  KerberosWrapper.Ticket              */
830                         s2n(enc_ticket->length,p);
831                         memcpy(p, enc_ticket->data, enc_ticket->length);
832                         p+= enc_ticket->length;
833                         n = enc_ticket->length + 2;
834
835                         /*  KerberosWrapper.Authenticator       */
836                         if (authp  &&  authp->length)  
837                                 {
838                                 s2n(authp->length,p);
839                                 memcpy(p, authp->data, authp->length);
840                                 p+= authp->length;
841                                 n+= authp->length + 2;
842                                 
843                                 free(authp->data);
844                                 authp->data = NULL;
845                                 authp->length = 0;
846                                 }
847                         else
848                                 {
849                                 s2n(0,p);/*  null authenticator length  */
850                                 n+=2;
851                                 }
852  
853                         if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
854                             goto err;
855
856                         /*  20010420 VRS.  Tried it this way; failed.
857                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
858                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
859                         **                              kssl_ctx->length);
860                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
861                         */
862
863                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
864                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
865                                 kssl_ctx->key,iv);
866                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
867                                 sizeof tmp_buf);
868                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
869                         outl += padl;
870                         if (outl > sizeof epms)
871                                 {
872                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
873                                 goto err;
874                                 }
875                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
876
877                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
878                         s2n(outl,p);
879                         memcpy(p, epms, outl);
880                         p+=outl;
881                         n+=outl + 2;
882
883                         s->session->master_key_length=
884                                 s->method->ssl3_enc->generate_master_secret(s,
885                                         s->session->master_key,
886                                         tmp_buf, sizeof tmp_buf);
887
888                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
889                         OPENSSL_cleanse(epms, outl);
890                         }
891 #endif
892 #ifndef OPENSSL_NO_DH
893                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
894                         {
895                         DH *dh_srvr,*dh_clnt;
896
897                         if (s->session->sess_cert->peer_dh_tmp != NULL)
898                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
899                         else
900                                 {
901                                 /* we get them from the cert */
902                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
903                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
904                                 goto err;
905                                 }
906                         
907                         /* generate a new random key */
908                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
909                                 {
910                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
911                                 goto err;
912                                 }
913                         if (!DH_generate_key(dh_clnt))
914                                 {
915                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
916                                 goto err;
917                                 }
918
919                         /* use the 'p' output buffer for the DH key, but
920                          * make sure to clear it out afterwards */
921
922                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
923
924                         if (n <= 0)
925                                 {
926                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
927                                 goto err;
928                                 }
929
930                         /* generate master key from the result */
931                         s->session->master_key_length=
932                                 s->method->ssl3_enc->generate_master_secret(s,
933                                         s->session->master_key,p,n);
934                         /* clean up */
935                         memset(p,0,n);
936
937                         /* send off the data */
938                         n=BN_num_bytes(dh_clnt->pub_key);
939                         s2n(n,p);
940                         BN_bn2bin(dh_clnt->pub_key,p);
941                         n+=2;
942
943                         DH_free(dh_clnt);
944
945                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
946                         }
947 #endif
948                 else
949                         {
950                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
951                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
952                         goto err;
953                         }
954                 
955                 d = dtls1_set_message_header(s, d,
956                 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
957                 /*
958                  *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
959                  l2n3(n,d);
960                  l2n(s->d1->handshake_write_seq,d);
961                  s->d1->handshake_write_seq++;
962                 */
963                 
964                 s->state=SSL3_ST_CW_KEY_EXCH_B;
965                 /* number of bytes to write */
966                 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
967                 s->init_off=0;
968
969                 /* buffer the message to handle re-xmits */
970                 dtls1_buffer_message(s, 0);
971                 }
972         
973         /* SSL3_ST_CW_KEY_EXCH_B */
974         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
975 err:
976         return(-1);
977         }
978
979 int dtls1_send_client_verify(SSL *s)
980         {
981         unsigned char *p,*d;
982         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
983         EVP_PKEY *pkey;
984 #ifndef OPENSSL_NO_RSA
985         unsigned u=0;
986 #endif
987         unsigned long n;
988 #ifndef OPENSSL_NO_DSA
989         int j;
990 #endif
991
992         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
993                 {
994                 d=(unsigned char *)s->init_buf->data;
995                 p= &(d[DTLS1_HM_HEADER_LENGTH]);
996                 pkey=s->cert->key->privatekey;
997
998                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
999                         &(data[MD5_DIGEST_LENGTH]));
1000
1001 #ifndef OPENSSL_NO_RSA
1002                 if (pkey->type == EVP_PKEY_RSA)
1003                         {
1004                         s->method->ssl3_enc->cert_verify_mac(s,
1005                                 &(s->s3->finish_dgst1),&(data[0]));
1006                         if (RSA_sign(NID_md5_sha1, data,
1007                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1008                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1009                                 {
1010                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1011                                 goto err;
1012                                 }
1013                         s2n(u,p);
1014                         n=u+2;
1015                         }
1016                 else
1017 #endif
1018 #ifndef OPENSSL_NO_DSA
1019                         if (pkey->type == EVP_PKEY_DSA)
1020                         {
1021                         if (!DSA_sign(pkey->save_type,
1022                                 &(data[MD5_DIGEST_LENGTH]),
1023                                 SHA_DIGEST_LENGTH,&(p[2]),
1024                                 (unsigned int *)&j,pkey->pkey.dsa))
1025                                 {
1026                                 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1027                                 goto err;
1028                                 }
1029                         s2n(j,p);
1030                         n=j+2;
1031                         }
1032                 else
1033 #endif
1034                         {
1035                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1036                         goto err;
1037                         }
1038
1039                 d = dtls1_set_message_header(s, d,
1040                         SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1041
1042                 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1043                 s->init_off=0;
1044
1045                 /* buffer the message to handle re-xmits */
1046                 dtls1_buffer_message(s, 0);
1047
1048                 s->state = SSL3_ST_CW_CERT_VRFY_B;
1049                 }
1050
1051         /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1052         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1053 err:
1054         return(-1);
1055         }
1056
1057 int dtls1_send_client_certificate(SSL *s)
1058         {
1059         X509 *x509=NULL;
1060         EVP_PKEY *pkey=NULL;
1061         int i;
1062         unsigned long l;
1063
1064         if (s->state == SSL3_ST_CW_CERT_A)
1065                 {
1066                 if ((s->cert == NULL) ||
1067                         (s->cert->key->x509 == NULL) ||
1068                         (s->cert->key->privatekey == NULL))
1069                         s->state=SSL3_ST_CW_CERT_B;
1070                 else
1071                         s->state=SSL3_ST_CW_CERT_C;
1072                 }
1073
1074         /* We need to get a client cert */
1075         if (s->state == SSL3_ST_CW_CERT_B)
1076                 {
1077                 /* If we get an error, we need to
1078                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1079                  * We then get retied later */
1080                 i=0;
1081                 if (s->ctx->client_cert_cb != NULL)
1082                         i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1083                 if (i < 0)
1084                         {
1085                         s->rwstate=SSL_X509_LOOKUP;
1086                         return(-1);
1087                         }
1088                 s->rwstate=SSL_NOTHING;
1089                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1090                         {
1091                         s->state=SSL3_ST_CW_CERT_B;
1092                         if (    !SSL_use_certificate(s,x509) ||
1093                                 !SSL_use_PrivateKey(s,pkey))
1094                                 i=0;
1095                         }
1096                 else if (i == 1)
1097                         {
1098                         i=0;
1099                         SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1100                         }
1101
1102                 if (x509 != NULL) X509_free(x509);
1103                 if (pkey != NULL) EVP_PKEY_free(pkey);
1104                 if (i == 0)
1105                         {
1106                         if (s->version == SSL3_VERSION)
1107                                 {
1108                                 s->s3->tmp.cert_req=0;
1109                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1110                                 return(1);
1111                                 }
1112                         else
1113                                 {
1114                                 s->s3->tmp.cert_req=2;
1115                                 }
1116                         }
1117
1118                 /* Ok, we have a cert */
1119                 s->state=SSL3_ST_CW_CERT_C;
1120                 }
1121
1122         if (s->state == SSL3_ST_CW_CERT_C)
1123                 {
1124                 s->state=SSL3_ST_CW_CERT_D;
1125                 l=dtls1_output_cert_chain(s,
1126                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1127                 s->init_num=(int)l;
1128                 s->init_off=0;
1129
1130                 /* set header called by dtls1_output_cert_chain() */
1131
1132                 /* buffer the message to handle re-xmits */
1133                 dtls1_buffer_message(s, 0);
1134                 }
1135         /* SSL3_ST_CW_CERT_D */
1136         return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1137         }
1138
1139