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Update from 1.0.0-stable.
[thirdparty/openssl.git] / ssl / d1_clnt.c
CommitLineData
36d16f8e
BL		 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/* ====================================================================
52b8dad8 7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
36d16f8e
BL		 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"
ef236ec3
DSH		 118#ifndef OPENSSL_NO_KRB5
119#include "kssl_lcl.h"
120#endif
36d16f8e
BL		 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>
1e26a8ba 126#include <openssl/bn.h>
3eeaab4b
NL		 127#ifndef OPENSSL_NO_DH
128#include <openssl/dh.h>
129#endif
36d16f8e 130
4ebb342f 131static const SSL_METHOD *dtls1_get_client_method(int ver);
36d16f8e
BL		 132static int dtls1_get_hello_verify(SSL *s);
133
4ebb342f 134static const SSL_METHOD *dtls1_get_client_method(int ver)
36d16f8e 135 {
8711efb4 136 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
36d16f8e
BL		 137 return(DTLSv1_client_method());
138 else
139 return(NULL);
140 }
141
f3b656b2
DSH		 142IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
143 ssl_undefined_function,
144 dtls1_connect,
145 dtls1_get_client_method)
36d16f8e
BL		 146
147int dtls1_connect(SSL *s)
148 {
149 BUF_MEM *buf=NULL;
7e69565f 150 unsigned long Time=(unsigned long)time(NULL);
36d16f8e
BL		 151 long num1;
152 void (*cb)(const SSL *ssl,int type,int val)=NULL;
153 int ret= -1;
154 int new_state,state,skip=0;;
155
156 RAND_add(&Time,sizeof(Time),0);
157 ERR_clear_error();
158 clear_sys_error();
159
160 if (s->info_callback != NULL)
161 cb=s->info_callback;
162 else if (s->ctx->info_callback != NULL)
163 cb=s->ctx->info_callback;
164
165 s->in_handshake++;
166 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
167
168 for (;;)
169 {
170 state=s->state;
171
172 switch(s->state)
173 {
174 case SSL_ST_RENEGOTIATE:
175 s->new_session=1;
176 s->state=SSL_ST_CONNECT;
177 s->ctx->stats.sess_connect_renegotiate++;
178 /* break */
179 case SSL_ST_BEFORE:
180 case SSL_ST_CONNECT:
181 case SSL_ST_BEFORE|SSL_ST_CONNECT:
182 case SSL_ST_OK|SSL_ST_CONNECT:
183
184 s->server=0;
185 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
186
8711efb4
DSH		 187 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
188 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
36d16f8e 189 {
beb056b3 190 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
36d16f8e
BL		 191 ret = -1;
192 goto end;
193 }
194
195 /* s->version=SSL3_VERSION; */
196 s->type=SSL_ST_CONNECT;
197
198 if (s->init_buf == NULL)
199 {
200 if ((buf=BUF_MEM_new()) == NULL)
201 {
202 ret= -1;
203 goto end;
204 }
205 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
206 {
207 ret= -1;
208 goto end;
209 }
210 s->init_buf=buf;
211 buf=NULL;
212 }
213
214 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
215
216 /* setup buffing BIO */
217 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
218
219 /* don't push the buffering BIO quite yet */
220
36d16f8e
BL		 221 s->state=SSL3_ST_CW_CLNT_HELLO_A;
222 s->ctx->stats.sess_connect++;
223 s->init_num=0;
e7adda52
AP		 224 /* mark client_random uninitialized */
225 memset(s->s3->client_random,0,sizeof(s->s3->client_random));
36d16f8e
BL		 226 break;
227
228 case SSL3_ST_CW_CLNT_HELLO_A:
229 case SSL3_ST_CW_CLNT_HELLO_B:
230
231 s->shutdown=0;
0d97d00b
AP		 232
233 /* every DTLS ClientHello resets Finished MAC */
234 ssl3_init_finished_mac(s);
235
eb38b26d 236 dtls1_start_timer(s);
36d16f8e
BL		 237 ret=dtls1_client_hello(s);
238 if (ret <= 0) goto end;
239
240 if ( s->d1->send_cookie)
241 {
242 s->state=SSL3_ST_CW_FLUSH;
243 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
244 }
245 else
246 s->state=SSL3_ST_CR_SRVR_HELLO_A;
247
248 s->init_num=0;
249
250 /* turn on buffering for the next lot of output */
251 if (s->bbio != s->wbio)
252 s->wbio=BIO_push(s->bbio,s->wbio);
253
254 break;
255
256 case SSL3_ST_CR_SRVR_HELLO_A:
257 case SSL3_ST_CR_SRVR_HELLO_B:
258 ret=ssl3_get_server_hello(s);
259 if (ret <= 0) goto end;
260 else
261 {
eb38b26d 262 dtls1_stop_timer(s);
36d16f8e
BL		 263 if (s->hit)
264 s->state=SSL3_ST_CR_FINISHED_A;
265 else
266 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
267 }
268 s->init_num=0;
269 break;
270
271 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
272 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
273
274 ret = dtls1_get_hello_verify(s);
275 if ( ret <= 0)
276 goto end;
eb38b26d 277 dtls1_stop_timer(s);
36d16f8e
BL		 278 if ( s->d1->send_cookie) /* start again, with a cookie */
279 s->state=SSL3_ST_CW_CLNT_HELLO_A;
280 else
281 s->state = SSL3_ST_CR_CERT_A;
282 s->init_num = 0;
283 break;
284
285 case SSL3_ST_CR_CERT_A:
286 case SSL3_ST_CR_CERT_B:
287 /* Check if it is anon DH */
52b8dad8 288 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
36d16f8e
BL		 289 {
290 ret=ssl3_get_server_certificate(s);
291 if (ret <= 0) goto end;
292 }
293 else
294 skip=1;
295 s->state=SSL3_ST_CR_KEY_EXCH_A;
296 s->init_num=0;
297 break;
298
299 case SSL3_ST_CR_KEY_EXCH_A:
300 case SSL3_ST_CR_KEY_EXCH_B:
301 ret=ssl3_get_key_exchange(s);
302 if (ret <= 0) goto end;
303 s->state=SSL3_ST_CR_CERT_REQ_A;
304 s->init_num=0;
305
306 /* at this point we check that we have the
307 * required stuff from the server */
308 if (!ssl3_check_cert_and_algorithm(s))
309 {
310 ret= -1;
311 goto end;
312 }
313 break;
314
315 case SSL3_ST_CR_CERT_REQ_A:
316 case SSL3_ST_CR_CERT_REQ_B:
317 ret=ssl3_get_certificate_request(s);
318 if (ret <= 0) goto end;
319 s->state=SSL3_ST_CR_SRVR_DONE_A;
320 s->init_num=0;
321 break;
322
323 case SSL3_ST_CR_SRVR_DONE_A:
324 case SSL3_ST_CR_SRVR_DONE_B:
325 ret=ssl3_get_server_done(s);
326 if (ret <= 0) goto end;
327 if (s->s3->tmp.cert_req)
328 s->state=SSL3_ST_CW_CERT_A;
329 else
330 s->state=SSL3_ST_CW_KEY_EXCH_A;
331 s->init_num=0;
332
333 break;
334
335 case SSL3_ST_CW_CERT_A:
336 case SSL3_ST_CW_CERT_B:
337 case SSL3_ST_CW_CERT_C:
338 case SSL3_ST_CW_CERT_D:
eb38b26d 339 dtls1_start_timer(s);
36d16f8e
BL		 340 ret=dtls1_send_client_certificate(s);
341 if (ret <= 0) goto end;
342 s->state=SSL3_ST_CW_KEY_EXCH_A;
343 s->init_num=0;
344 break;
345
346 case SSL3_ST_CW_KEY_EXCH_A:
347 case SSL3_ST_CW_KEY_EXCH_B:
eb38b26d 348 dtls1_start_timer(s);
36d16f8e
BL		 349 ret=dtls1_send_client_key_exchange(s);
350 if (ret <= 0) goto end;
36d16f8e
BL		 351 /* EAY EAY EAY need to check for DH fix cert
352 * sent back */
353 /* For TLS, cert_req is set to 2, so a cert chain
354 * of nothing is sent, but no verify packet is sent */
355 if (s->s3->tmp.cert_req == 1)
356 {
357 s->state=SSL3_ST_CW_CERT_VRFY_A;
358 }
359 else
360 {
361 s->state=SSL3_ST_CW_CHANGE_A;
362 s->s3->change_cipher_spec=0;
363 }
364
365 s->init_num=0;
366 break;
367
368 case SSL3_ST_CW_CERT_VRFY_A:
369 case SSL3_ST_CW_CERT_VRFY_B:
eb38b26d 370 dtls1_start_timer(s);
36d16f8e
BL		 371 ret=dtls1_send_client_verify(s);
372 if (ret <= 0) goto end;
373 s->state=SSL3_ST_CW_CHANGE_A;
374 s->init_num=0;
375 s->s3->change_cipher_spec=0;
376 break;
377
378 case SSL3_ST_CW_CHANGE_A:
379 case SSL3_ST_CW_CHANGE_B:
eb38b26d 380 dtls1_start_timer(s);
36d16f8e
BL		 381 ret=dtls1_send_change_cipher_spec(s,
382 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
383 if (ret <= 0) goto end;
384 s->state=SSL3_ST_CW_FINISHED_A;
385 s->init_num=0;
386
387 s->session->cipher=s->s3->tmp.new_cipher;
09b6c2ef
DSH		 388#ifdef OPENSSL_NO_COMP
389 s->session->compress_meth=0;
390#else
36d16f8e
BL		 391 if (s->s3->tmp.new_compression == NULL)
392 s->session->compress_meth=0;
393 else
394 s->session->compress_meth=
395 s->s3->tmp.new_compression->id;
09b6c2ef 396#endif
36d16f8e
BL		 397 if (!s->method->ssl3_enc->setup_key_block(s))
398 {
399 ret= -1;
400 goto end;
401 }
402
403 if (!s->method->ssl3_enc->change_cipher_state(s,
404 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
405 {
406 ret= -1;
407 goto end;
408 }
409
410 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
411 break;
412
413 case SSL3_ST_CW_FINISHED_A:
414 case SSL3_ST_CW_FINISHED_B:
eb38b26d 415 dtls1_start_timer(s);
36d16f8e
BL		 416 ret=dtls1_send_finished(s,
417 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
418 s->method->ssl3_enc->client_finished_label,
419 s->method->ssl3_enc->client_finished_label_len);
420 if (ret <= 0) goto end;
421 s->state=SSL3_ST_CW_FLUSH;
422
423 /* clear flags */
424 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
425 if (s->hit)
426 {
427 s->s3->tmp.next_state=SSL_ST_OK;
428 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
429 {
430 s->state=SSL_ST_OK;
431 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
432 s->s3->delay_buf_pop_ret=0;
433 }
434 }
435 else
436 {
437 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
438 }
439 s->init_num=0;
440 break;
441
442 case SSL3_ST_CR_FINISHED_A:
443 case SSL3_ST_CR_FINISHED_B:
444
445 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
446 SSL3_ST_CR_FINISHED_B);
447 if (ret <= 0) goto end;
eb38b26d 448 dtls1_stop_timer(s);
36d16f8e
BL		 449
450 if (s->hit)
451 s->state=SSL3_ST_CW_CHANGE_A;
452 else
453 s->state=SSL_ST_OK;
454 s->init_num=0;
455 break;
456
457 case SSL3_ST_CW_FLUSH:
458 /* number of bytes to be flushed */
459 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
460 if (num1 > 0)
461 {
462 s->rwstate=SSL_WRITING;
463 num1=BIO_flush(s->wbio);
464 if (num1 <= 0) { ret= -1; goto end; }
465 s->rwstate=SSL_NOTHING;
466 }
467
468 s->state=s->s3->tmp.next_state;
469 break;
470
471 case SSL_ST_OK:
472 /* clean a few things up */
473 ssl3_cleanup_key_block(s);
474
475#if 0
476 if (s->init_buf != NULL)
477 {
478 BUF_MEM_free(s->init_buf);
479 s->init_buf=NULL;
480 }
481#endif
482
483 /* If we are not 'joining' the last two packets,
484 * remove the buffering now */
485 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
486 ssl_free_wbio_buffer(s);
487 /* else do it later in ssl3_write */
488
489 s->init_num=0;
490 s->new_session=0;
491
492 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
493 if (s->hit) s->ctx->stats.sess_hit++;
494
495 ret=1;
496 /* s->server=0; */
497 s->handshake_func=dtls1_connect;
498 s->ctx->stats.sess_connect_good++;
499
500 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
501
502 /* done with handshaking */
503 s->d1->handshake_read_seq = 0;
e5fa864f 504 s->d1->next_handshake_write_seq = 0;
36d16f8e
BL		 505 goto end;
506 /* break; */
507
508 default:
beb056b3 509 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
36d16f8e
BL		 510 ret= -1;
511 goto end;
512 /* break; */
513 }
514
515 /* did we do anything */
516 if (!s->s3->tmp.reuse_message && !skip)
517 {
518 if (s->debug)
519 {
520 if ((ret=BIO_flush(s->wbio)) <= 0)
521 goto end;
522 }
523
524 if ((cb != NULL) && (s->state != state))
525 {
526 new_state=s->state;
527 s->state=state;
528 cb(s,SSL_CB_CONNECT_LOOP,1);
529 s->state=new_state;
530 }
531 }
532 skip=0;
533 }
534end:
535 s->in_handshake--;
536 if (buf != NULL)
537 BUF_MEM_free(buf);
538 if (cb != NULL)
539 cb(s,SSL_CB_CONNECT_EXIT,ret);
540 return(ret);
541 }
542
543int dtls1_client_hello(SSL *s)
544 {
545 unsigned char *buf;
546 unsigned char *p,*d;
20a90e3a 547 unsigned int i,j;
36d16f8e
BL		 548 unsigned long Time,l;
549 SSL_COMP *comp;
550
551 buf=(unsigned char *)s->init_buf->data;
552 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
553 {
554 if ((s->session == NULL) ||
555 (s->session->ssl_version != s->version) ||
556 (s->session->not_resumable))
557 {
558 if (!ssl_get_new_session(s,0))
559 goto err;
560 }
561 /* else use the pre-loaded session */
562
563 p=s->s3->client_random;
e7adda52
AP		 564
565 /* if client_random is initialized, reuse it, we are
566 * required to use same upon reply to HelloVerify */
567 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
568 if (i==sizeof(s->s3->client_random))
569 {
570 Time=(unsigned long)time(NULL); /* Time */
571 l2n(Time,p);
572 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
573 }
36d16f8e
BL		 574
575 /* Do the message type and length last */
576 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
577
578 *(p++)=s->version>>8;
579 *(p++)=s->version&0xff;
580 s->client_version=s->version;
581
582 /* Random stuff */
583 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
584 p+=SSL3_RANDOM_SIZE;
585
586 /* Session ID */
587 if (s->new_session)
588 i=0;
589 else
590 i=s->session->session_id_length;
591 *(p++)=i;
592 if (i != 0)
593 {
594 if (i > sizeof s->session->session_id)
595 {
beb056b3 596 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
36d16f8e
BL		 597 goto err;
598 }
599 memcpy(p,s->session->session_id,i);
600 p+=i;
601 }
602
603 /* cookie stuff */
604 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
605 {
beb056b3 606 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
36d16f8e
BL		 607 goto err;
608 }
609 *(p++) = s->d1->cookie_len;
610 memcpy(p, s->d1->cookie, s->d1->cookie_len);
611 p += s->d1->cookie_len;
612
613 /* Ciphers supported */
c6c2e313 614 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
36d16f8e
BL		 615 if (i == 0)
616 {
beb056b3 617 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
36d16f8e
BL		 618 goto err;
619 }
620 s2n(i,p);
621 p+=i;
622
623 /* COMPRESSION */
624 if (s->ctx->comp_methods == NULL)
625 j=0;
626 else
627 j=sk_SSL_COMP_num(s->ctx->comp_methods);
628 *(p++)=1+j;
629 for (i=0; i<j; i++)
630 {
631 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
632 *(p++)=comp->id;
633 }
634 *(p++)=0; /* Add the NULL method */
635
636 l=(p-d);
637 d=buf;
638
639 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
640
641 s->state=SSL3_ST_CW_CLNT_HELLO_B;
642 /* number of bytes to write */
643 s->init_num=p-buf;
644 s->init_off=0;
645
646 /* buffer the message to handle re-xmits */
647 dtls1_buffer_message(s, 0);
648 }
649
650 /* SSL3_ST_CW_CLNT_HELLO_B */
651 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
652err:
653 return(-1);
654 }
655
656static int dtls1_get_hello_verify(SSL *s)
657 {
658 int n, al, ok = 0;
659 unsigned char *data;
660 unsigned int cookie_len;
661
662 n=s->method->ssl_get_message(s,
663 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
664 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
665 -1,
666 s->max_cert_list,
667 &ok);
668
669 if (!ok) return((int)n);
670
671 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
672 {
673 s->d1->send_cookie = 0;
674 s->s3->tmp.reuse_message=1;
675 return(1);
676 }
677
678 data = (unsigned char *)s->init_msg;
679
680 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
681 {
beb056b3 682 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
36d16f8e
BL		 683 s->version=(s->version&0xff00)|data[1];
684 al = SSL_AD_PROTOCOL_VERSION;
685 goto f_err;
686 }
687 data+=2;
688
689 cookie_len = *(data++);
690 if ( cookie_len > sizeof(s->d1->cookie))
691 {
692 al=SSL_AD_ILLEGAL_PARAMETER;
693 goto f_err;
694 }
695
696 memcpy(s->d1->cookie, data, cookie_len);
697 s->d1->cookie_len = cookie_len;
698
699 s->d1->send_cookie = 1;
700 return 1;
701
702f_err:
703 ssl3_send_alert(s, SSL3_AL_FATAL, al);
704 return -1;
705 }
706
707int dtls1_send_client_key_exchange(SSL *s)
708 {
709 unsigned char *p,*d;
710 int n;
52b8dad8 711 unsigned long alg_k;
36d16f8e
BL		 712#ifndef OPENSSL_NO_RSA
713 unsigned char *q;
714 EVP_PKEY *pkey=NULL;
715#endif
716#ifndef OPENSSL_NO_KRB5
717 KSSL_ERR kssl_err;
718#endif /* OPENSSL_NO_KRB5 */
719
720 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
721 {
722 d=(unsigned char *)s->init_buf->data;
723 p= &(d[DTLS1_HM_HEADER_LENGTH]);
52b8dad8
BM		 724
725 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
36d16f8e
BL		 726
727 /* Fool emacs indentation */
728 if (0) {}
729#ifndef OPENSSL_NO_RSA
52b8dad8 730 else if (alg_k & SSL_kRSA)
36d16f8e
BL		 731 {
732 RSA *rsa;
733 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
734
735 if (s->session->sess_cert->peer_rsa_tmp != NULL)
736 rsa=s->session->sess_cert->peer_rsa_tmp;
737 else
738 {
739 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
740 if ((pkey == NULL) ||
741 (pkey->type != EVP_PKEY_RSA) ||
742 (pkey->pkey.rsa == NULL))
743 {
beb056b3 744 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
36d16f8e
BL		 745 goto err;
746 }
747 rsa=pkey->pkey.rsa;
748 EVP_PKEY_free(pkey);
749 }
750
751 tmp_buf[0]=s->client_version>>8;
752 tmp_buf[1]=s->client_version&0xff;
753 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
754 goto err;
755
756 s->session->master_key_length=sizeof tmp_buf;
757
758 q=p;
e7adda52 759 /* Fix buf for TLS and [incidentally] DTLS */
36d16f8e
BL		 760 if (s->version > SSL3_VERSION)
761 p+=2;
762 n=RSA_public_encrypt(sizeof tmp_buf,
763 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
764#ifdef PKCS1_CHECK
765 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
766 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
767#endif
768 if (n <= 0)
769 {
beb056b3 770 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
36d16f8e
BL		 771 goto err;
772 }
773
e7adda52 774 /* Fix buf for TLS and [incidentally] DTLS */
36d16f8e
BL		 775 if (s->version > SSL3_VERSION)
776 {
777 s2n(n,q);
778 n+=2;
779 }
780
781 s->session->master_key_length=
782 s->method->ssl3_enc->generate_master_secret(s,
783 s->session->master_key,
784 tmp_buf,sizeof tmp_buf);
785 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
786 }
787#endif
788#ifndef OPENSSL_NO_KRB5
52b8dad8 789 else if (alg_k & SSL_kKRB5)
36d16f8e
BL		 790 {
791 krb5_error_code krb5rc;
792 KSSL_CTX *kssl_ctx = s->kssl_ctx;
793 /* krb5_data krb5_ap_req; */
794 krb5_data *enc_ticket;
795 krb5_data authenticator, *authp = NULL;
796 EVP_CIPHER_CTX ciph_ctx;
ef236ec3 797 const EVP_CIPHER *enc = NULL;
36d16f8e
BL		 798 unsigned char iv[EVP_MAX_IV_LENGTH];
799 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
800 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
801 + EVP_MAX_IV_LENGTH];
802 int padl, outl = sizeof(epms);
803
804 EVP_CIPHER_CTX_init(&ciph_ctx);
805
806#ifdef KSSL_DEBUG
807 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
52b8dad8 808 alg_k, SSL_kKRB5);
36d16f8e
BL		 809#endif /* KSSL_DEBUG */
810
811 authp = NULL;
812#ifdef KRB5SENDAUTH
813 if (KRB5SENDAUTH) authp = &authenticator;
814#endif /* KRB5SENDAUTH */
815
816 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
817 &kssl_err);
818 enc = kssl_map_enc(kssl_ctx->enctype);
819 if (enc == NULL)
820 goto err;
821#ifdef KSSL_DEBUG
822 {
823 printf("kssl_cget_tkt rtn %d\n", krb5rc);
824 if (krb5rc && kssl_err.text)
825 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
826 }
827#endif /* KSSL_DEBUG */
828
829 if (krb5rc)
830 {
831 ssl3_send_alert(s,SSL3_AL_FATAL,
832 SSL_AD_HANDSHAKE_FAILURE);
beb056b3 833 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
36d16f8e
BL		 834 kssl_err.reason);
835 goto err;
836 }
837
838 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
839 ** in place of RFC 2712 KerberosWrapper, as in:
840 **
841 ** Send ticket (copy to *p, set n = length)
842 ** n = krb5_ap_req.length;
843 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
844 ** if (krb5_ap_req.data)
845 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
846 **
847 ** Now using real RFC 2712 KerberosWrapper
848 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
849 ** Note: 2712 "opaque" types are here replaced
850 ** with a 2-byte length followed by the value.
851 ** Example:
852 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
853 ** Where "xx xx" = length bytes. Shown here with
854 ** optional authenticator omitted.
855 */
856
857 /* KerberosWrapper.Ticket */
858 s2n(enc_ticket->length,p);
859 memcpy(p, enc_ticket->data, enc_ticket->length);
860 p+= enc_ticket->length;
861 n = enc_ticket->length + 2;
862
863 /* KerberosWrapper.Authenticator */
864 if (authp && authp->length)
865 {
866 s2n(authp->length,p);
867 memcpy(p, authp->data, authp->length);
868 p+= authp->length;
869 n+= authp->length + 2;
870
871 free(authp->data);
872 authp->data = NULL;
873 authp->length = 0;
874 }
875 else
876 {
877 s2n(0,p);/* null authenticator length */
878 n+=2;
879 }
880
881 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
882 goto err;
883
884 /* 20010420 VRS. Tried it this way; failed.
885 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
886 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
887 ** kssl_ctx->length);
888 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
889 */
890
891 memset(iv, 0, sizeof iv); /* per RFC 1510 */
892 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
893 kssl_ctx->key,iv);
894 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
895 sizeof tmp_buf);
896 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
897 outl += padl;
ef236ec3 898 if (outl > (int)sizeof epms)
36d16f8e 899 {
beb056b3 900 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
36d16f8e
BL		 901 goto err;
902 }
903 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
904
905 /* KerberosWrapper.EncryptedPreMasterSecret */
906 s2n(outl,p);
907 memcpy(p, epms, outl);
908 p+=outl;
909 n+=outl + 2;
910
911 s->session->master_key_length=
912 s->method->ssl3_enc->generate_master_secret(s,
913 s->session->master_key,
914 tmp_buf, sizeof tmp_buf);
915
916 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
917 OPENSSL_cleanse(epms, outl);
918 }
919#endif
920#ifndef OPENSSL_NO_DH
52b8dad8 921 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
36d16f8e
BL		 922 {
923 DH *dh_srvr,*dh_clnt;
924
925 if (s->session->sess_cert->peer_dh_tmp != NULL)
926 dh_srvr=s->session->sess_cert->peer_dh_tmp;
927 else
928 {
929 /* we get them from the cert */
930 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
beb056b3 931 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
36d16f8e
BL		 932 goto err;
933 }
934
935 /* generate a new random key */
936 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
937 {
beb056b3 938 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
36d16f8e
BL		 939 goto err;
940 }
941 if (!DH_generate_key(dh_clnt))
942 {
beb056b3 943 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
36d16f8e
BL		 944 goto err;
945 }
946
947 /* use the 'p' output buffer for the DH key, but
948 * make sure to clear it out afterwards */
949
950 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
951
952 if (n <= 0)
953 {
beb056b3 954 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
36d16f8e
BL		 955 goto err;
956 }
957
958 /* generate master key from the result */
959 s->session->master_key_length=
960 s->method->ssl3_enc->generate_master_secret(s,
961 s->session->master_key,p,n);
962 /* clean up */
963 memset(p,0,n);
964
965 /* send off the data */
966 n=BN_num_bytes(dh_clnt->pub_key);
967 s2n(n,p);
968 BN_bn2bin(dh_clnt->pub_key,p);
969 n+=2;
970
971 DH_free(dh_clnt);
972
973 /* perhaps clean things up a bit EAY EAY EAY EAY*/
974 }
975#endif
976 else
977 {
978 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
beb056b3 979 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
36d16f8e
BL		 980 goto err;
981 }
982
983 d = dtls1_set_message_header(s, d,
984 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
985 /*
986 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
987 l2n3(n,d);
988 l2n(s->d1->handshake_write_seq,d);
989 s->d1->handshake_write_seq++;
990 */
991
992 s->state=SSL3_ST_CW_KEY_EXCH_B;
993 /* number of bytes to write */
994 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
995 s->init_off=0;
996
997 /* buffer the message to handle re-xmits */
998 dtls1_buffer_message(s, 0);
999 }
1000
1001 /* SSL3_ST_CW_KEY_EXCH_B */
1002 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1003err:
1004 return(-1);
1005 }
1006
1007int dtls1_send_client_verify(SSL *s)
1008 {
1009 unsigned char *p,*d;
1010 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1011 EVP_PKEY *pkey;
1012#ifndef OPENSSL_NO_RSA
1013 unsigned u=0;
1014#endif
1015 unsigned long n;
1016#ifndef OPENSSL_NO_DSA
1017 int j;
1018#endif
1019
1020 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1021 {
1022 d=(unsigned char *)s->init_buf->data;
1023 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1024 pkey=s->cert->key->privatekey;
1025
81025661
DSH		 1026 s->method->ssl3_enc->cert_verify_mac(s,
1027 NID_sha1,
36d16f8e
BL		 1028 &(data[MD5_DIGEST_LENGTH]));
1029
1030#ifndef OPENSSL_NO_RSA
1031 if (pkey->type == EVP_PKEY_RSA)
1032 {
1033 s->method->ssl3_enc->cert_verify_mac(s,
81025661
DSH		 1034 NID_md5,
1035 &(data[0]));
36d16f8e
BL		 1036 if (RSA_sign(NID_md5_sha1, data,
1037 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1038 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1039 {
beb056b3 1040 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
36d16f8e
BL		 1041 goto err;
1042 }
1043 s2n(u,p);
1044 n=u+2;
1045 }
1046 else
1047#endif
1048#ifndef OPENSSL_NO_DSA
1049 if (pkey->type == EVP_PKEY_DSA)
1050 {
1051 if (!DSA_sign(pkey->save_type,
1052 &(data[MD5_DIGEST_LENGTH]),
1053 SHA_DIGEST_LENGTH,&(p[2]),
1054 (unsigned int *)&j,pkey->pkey.dsa))
1055 {
beb056b3 1056 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
36d16f8e
BL		 1057 goto err;
1058 }
1059 s2n(j,p);
1060 n=j+2;
1061 }
1062 else
1063#endif
1064 {
beb056b3 1065 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
36d16f8e
BL		 1066 goto err;
1067 }
1068
1069 d = dtls1_set_message_header(s, d,
1070 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1071
1072 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1073 s->init_off=0;
1074
1075 /* buffer the message to handle re-xmits */
1076 dtls1_buffer_message(s, 0);
1077
1078 s->state = SSL3_ST_CW_CERT_VRFY_B;
1079 }
1080
1081 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1082 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1083err:
1084 return(-1);
1085 }
1086
1087int dtls1_send_client_certificate(SSL *s)
1088 {
1089 X509 *x509=NULL;
1090 EVP_PKEY *pkey=NULL;
1091 int i;
1092 unsigned long l;
1093
1094 if (s->state == SSL3_ST_CW_CERT_A)
1095 {
1096 if ((s->cert == NULL) ||
1097 (s->cert->key->x509 == NULL) ||
1098 (s->cert->key->privatekey == NULL))
1099 s->state=SSL3_ST_CW_CERT_B;
1100 else
1101 s->state=SSL3_ST_CW_CERT_C;
1102 }
1103
1104 /* We need to get a client cert */
1105 if (s->state == SSL3_ST_CW_CERT_B)
1106 {
1107 /* If we get an error, we need to
1108 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1109 * We then get retied later */
1110 i=0;
368888bc 1111 i = ssl_do_client_cert_cb(s, &x509, &pkey);
36d16f8e
BL		 1112 if (i < 0)
1113 {
1114 s->rwstate=SSL_X509_LOOKUP;
1115 return(-1);
1116 }
1117 s->rwstate=SSL_NOTHING;
1118 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1119 {
1120 s->state=SSL3_ST_CW_CERT_B;
1121 if ( !SSL_use_certificate(s,x509) ||
1122 !SSL_use_PrivateKey(s,pkey))
1123 i=0;
1124 }
1125 else if (i == 1)
1126 {
1127 i=0;
beb056b3 1128 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
36d16f8e
BL		 1129 }
1130
1131 if (x509 != NULL) X509_free(x509);
1132 if (pkey != NULL) EVP_PKEY_free(pkey);
1133 if (i == 0)
1134 {
1135 if (s->version == SSL3_VERSION)
1136 {
1137 s->s3->tmp.cert_req=0;
1138 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1139 return(1);
1140 }
1141 else
1142 {
1143 s->s3->tmp.cert_req=2;
1144 }
1145 }
1146
1147 /* Ok, we have a cert */
1148 s->state=SSL3_ST_CW_CERT_C;
1149 }
1150
1151 if (s->state == SSL3_ST_CW_CERT_C)
1152 {
1153 s->state=SSL3_ST_CW_CERT_D;
1154 l=dtls1_output_cert_chain(s,
1155 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1156 s->init_num=(int)l;
1157 s->init_off=0;
1158
1159 /* set header called by dtls1_output_cert_chain() */
1160
1161 /* buffer the message to handle re-xmits */
1162 dtls1_buffer_message(s, 0);
1163 }
1164 /* SSL3_ST_CW_CERT_D */
1165 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1166 }
1167
1168
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