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
dtls1_get_client_method(int ver)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
IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,ssl_undefined_function,dtls1_connect,dtls1_get_client_method)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
155 RAND_add(&Time,sizeof(Time),0);
156 ERR_clear_error();
157 clear_sys_error();
158
159 if (s->info_callback != NULL)
160 cb=s->info_callback;
161 else if (s->ctx->info_callback != NULL)
162 cb=s->ctx->info_callback;
163
164 s->in_handshake++;
165 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
166
167 for (;;)
168 {
169 state=s->state;
170
171 switch(s->state)
172 {
173 case SSL_ST_RENEGOTIATE:
174 s->new_session=1;
175 s->state=SSL_ST_CONNECT;
176 s->ctx->stats.sess_connect_renegotiate++;
177 /* break */
178 case SSL_ST_BEFORE:
179 case SSL_ST_CONNECT:
180 case SSL_ST_BEFORE|SSL_ST_CONNECT:
181 case SSL_ST_OK|SSL_ST_CONNECT:
182
183 s->server=0;
184 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
185
186 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
187 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 0xff00))
188 {
189 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
190 ret = -1;
191 goto end;
192 }
193
194 /* s->version=SSL3_VERSION; */
195 s->type=SSL_ST_CONNECT;
196
197 if (s->init_buf == NULL)
198 {
199 if ((buf=BUF_MEM_new()) == NULL)
200 {
201 ret= -1;
202 goto end;
203 }
204 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
205 {
206 ret= -1;
207 goto end;
208 }
209 s->init_buf=buf;
210 buf=NULL;
211 }
212
213 if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
214
215 /* setup buffing BIO */
216 if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
217
218 /* don't push the buffering BIO quite yet */
219
220 s->state=SSL3_ST_CW_CLNT_HELLO_A;
221 s->ctx->stats.sess_connect++;
222 s->init_num=0;
223 /* mark client_random uninitialized */
224 memset(s->s3->client_random,0,sizeof(s->s3->client_random));
225 s->d1->send_cookie = 0;
226 s->hit = 0;
227 break;
228
229 case SSL3_ST_CW_CLNT_HELLO_A:
230 case SSL3_ST_CW_CLNT_HELLO_B:
231
232 s->shutdown=0;
233
234 /* every DTLS ClientHello resets Finished MAC */
235 ssl3_init_finished_mac(s);
236
237 dtls1_start_timer(s);
238 ret=dtls1_client_hello(s);
239 if (ret <= 0) goto end;
240
241 if ( s->d1->send_cookie)
242 {
243 s->state=SSL3_ST_CW_FLUSH;
244 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
245 }
246 else
247 s->state=SSL3_ST_CR_SRVR_HELLO_A;
248
249 s->init_num=0;
250
251 /* turn on buffering for the next lot of output */
252 if (s->bbio != s->wbio)
253 s->wbio=BIO_push(s->bbio,s->wbio);
254
255 break;
256
257 case SSL3_ST_CR_SRVR_HELLO_A:
258 case SSL3_ST_CR_SRVR_HELLO_B:
259 ret=ssl3_get_server_hello(s);
260 if (ret <= 0) goto end;
261 else
262 {
263 dtls1_stop_timer(s);
264 if (s->hit)
265 s->state=SSL3_ST_CR_FINISHED_A;
266 else
267 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
268 }
269 s->init_num=0;
270 break;
271
272 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
273 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
274
275 ret = dtls1_get_hello_verify(s);
276 if ( ret <= 0)
277 goto end;
278 dtls1_stop_timer(s);
279 if ( s->d1->send_cookie) /* start again, with a cookie */
280 s->state=SSL3_ST_CW_CLNT_HELLO_A;
281 else
282 s->state = SSL3_ST_CR_CERT_A;
283 s->init_num = 0;
284 break;
285
286 case SSL3_ST_CR_CERT_A:
287 case SSL3_ST_CR_CERT_B:
288 #ifndef OPENSSL_NO_TLSEXT
289 ret=ssl3_check_finished(s);
290 if (ret <= 0) goto end;
291 if (ret == 2)
292 {
293 s->hit = 1;
294 if (s->tlsext_ticket_expected)
295 s->state=SSL3_ST_CR_SESSION_TICKET_A;
296 else
297 s->state=SSL3_ST_CR_FINISHED_A;
298 s->init_num=0;
299 break;
300 }
301 #endif
302 /* Check if it is anon DH or PSK */
303 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
304 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
305 {
306 ret=ssl3_get_server_certificate(s);
307 if (ret <= 0) goto end;
308 #ifndef OPENSSL_NO_TLSEXT
309 if (s->tlsext_status_expected)
310 s->state=SSL3_ST_CR_CERT_STATUS_A;
311 else
312 s->state=SSL3_ST_CR_KEY_EXCH_A;
313 }
314 else
315 {
316 skip = 1;
317 s->state=SSL3_ST_CR_KEY_EXCH_A;
318 }
319 #else
320 }
321 else
322 skip=1;
323
324 s->state=SSL3_ST_CR_KEY_EXCH_A;
325 #endif
326 s->init_num=0;
327 break;
328
329 case SSL3_ST_CR_KEY_EXCH_A:
330 case SSL3_ST_CR_KEY_EXCH_B:
331 ret=ssl3_get_key_exchange(s);
332 if (ret <= 0) goto end;
333 s->state=SSL3_ST_CR_CERT_REQ_A;
334 s->init_num=0;
335
336 /* at this point we check that we have the
337 * required stuff from the server */
338 if (!ssl3_check_cert_and_algorithm(s))
339 {
340 ret= -1;
341 goto end;
342 }
343 break;
344
345 case SSL3_ST_CR_CERT_REQ_A:
346 case SSL3_ST_CR_CERT_REQ_B:
347 ret=ssl3_get_certificate_request(s);
348 if (ret <= 0) goto end;
349 s->state=SSL3_ST_CR_SRVR_DONE_A;
350 s->init_num=0;
351 break;
352
353 case SSL3_ST_CR_SRVR_DONE_A:
354 case SSL3_ST_CR_SRVR_DONE_B:
355 ret=ssl3_get_server_done(s);
356 if (ret <= 0) goto end;
357 if (s->s3->tmp.cert_req)
358 s->state=SSL3_ST_CW_CERT_A;
359 else
360 s->state=SSL3_ST_CW_KEY_EXCH_A;
361 s->init_num=0;
362
363 break;
364
365 case SSL3_ST_CW_CERT_A:
366 case SSL3_ST_CW_CERT_B:
367 case SSL3_ST_CW_CERT_C:
368 case SSL3_ST_CW_CERT_D:
369 dtls1_start_timer(s);
370 ret=dtls1_send_client_certificate(s);
371 if (ret <= 0) goto end;
372 s->state=SSL3_ST_CW_KEY_EXCH_A;
373 s->init_num=0;
374 break;
375
376 case SSL3_ST_CW_KEY_EXCH_A:
377 case SSL3_ST_CW_KEY_EXCH_B:
378 dtls1_start_timer(s);
379 ret=dtls1_send_client_key_exchange(s);
380 if (ret <= 0) goto end;
381 /* EAY EAY EAY need to check for DH fix cert
382 * sent back */
383 /* For TLS, cert_req is set to 2, so a cert chain
384 * of nothing is sent, but no verify packet is sent */
385 if (s->s3->tmp.cert_req == 1)
386 {
387 s->state=SSL3_ST_CW_CERT_VRFY_A;
388 }
389 else
390 {
391 s->state=SSL3_ST_CW_CHANGE_A;
392 s->s3->change_cipher_spec=0;
393 }
394
395 s->init_num=0;
396 break;
397
398 case SSL3_ST_CW_CERT_VRFY_A:
399 case SSL3_ST_CW_CERT_VRFY_B:
400 dtls1_start_timer(s);
401 ret=dtls1_send_client_verify(s);
402 if (ret <= 0) goto end;
403 s->state=SSL3_ST_CW_CHANGE_A;
404 s->init_num=0;
405 s->s3->change_cipher_spec=0;
406 break;
407
408 case SSL3_ST_CW_CHANGE_A:
409 case SSL3_ST_CW_CHANGE_B:
410 if (!s->hit)
411 dtls1_start_timer(s);
412 ret=dtls1_send_change_cipher_spec(s,
413 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
414 if (ret <= 0) goto end;
415 s->state=SSL3_ST_CW_FINISHED_A;
416 s->init_num=0;
417
418 s->session->cipher=s->s3->tmp.new_cipher;
419 #ifdef OPENSSL_NO_COMP
420 s->session->compress_meth=0;
421 #else
422 if (s->s3->tmp.new_compression == NULL)
423 s->session->compress_meth=0;
424 else
425 s->session->compress_meth=
426 s->s3->tmp.new_compression->id;
427 #endif
428 if (!s->method->ssl3_enc->setup_key_block(s))
429 {
430 ret= -1;
431 goto end;
432 }
433
434 if (!s->method->ssl3_enc->change_cipher_state(s,
435 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
436 {
437 ret= -1;
438 goto end;
439 }
440
441 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
442 break;
443
444 case SSL3_ST_CW_FINISHED_A:
445 case SSL3_ST_CW_FINISHED_B:
446 if (!s->hit)
447 dtls1_start_timer(s);
448 ret=dtls1_send_finished(s,
449 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
450 s->method->ssl3_enc->client_finished_label,
451 s->method->ssl3_enc->client_finished_label_len);
452 if (ret <= 0) goto end;
453 s->state=SSL3_ST_CW_FLUSH;
454
455 /* clear flags */
456 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
457 if (s->hit)
458 {
459 s->s3->tmp.next_state=SSL_ST_OK;
460 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
461 {
462 s->state=SSL_ST_OK;
463 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
464 s->s3->delay_buf_pop_ret=0;
465 }
466 }
467 else
468 {
469 #ifndef OPENSSL_NO_TLSEXT
470 /* Allow NewSessionTicket if ticket expected */
471 if (s->tlsext_ticket_expected)
472 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
473 else
474 #endif
475
476 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
477 }
478 s->init_num=0;
479 break;
480
481 #ifndef OPENSSL_NO_TLSEXT
482 case SSL3_ST_CR_SESSION_TICKET_A:
483 case SSL3_ST_CR_SESSION_TICKET_B:
484 ret=ssl3_get_new_session_ticket(s);
485 if (ret <= 0) goto end;
486 s->state=SSL3_ST_CR_FINISHED_A;
487 s->init_num=0;
488 break;
489
490 case SSL3_ST_CR_CERT_STATUS_A:
491 case SSL3_ST_CR_CERT_STATUS_B:
492 ret=ssl3_get_cert_status(s);
493 if (ret <= 0) goto end;
494 s->state=SSL3_ST_CR_KEY_EXCH_A;
495 s->init_num=0;
496 break;
497 #endif
498
499 case SSL3_ST_CR_FINISHED_A:
500 case SSL3_ST_CR_FINISHED_B:
501 s->d1->change_cipher_spec_ok = 1;
502 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
503 SSL3_ST_CR_FINISHED_B);
504 if (ret <= 0) goto end;
505 dtls1_stop_timer(s);
506
507 if (s->hit)
508 s->state=SSL3_ST_CW_CHANGE_A;
509 else
510 s->state=SSL_ST_OK;
511 s->init_num=0;
512 break;
513
514 case SSL3_ST_CW_FLUSH:
515 s->rwstate=SSL_WRITING;
516 if (BIO_flush(s->wbio) <= 0)
517 {
518 ret= -1;
519 goto end;
520 }
521 s->rwstate=SSL_NOTHING;
522 s->state=s->s3->tmp.next_state;
523 break;
524
525 case SSL_ST_OK:
526 /* clean a few things up */
527 ssl3_cleanup_key_block(s);
528
529 #if 0
530 if (s->init_buf != NULL)
531 {
532 BUF_MEM_free(s->init_buf);
533 s->init_buf=NULL;
534 }
535 #endif
536
537 /* If we are not 'joining' the last two packets,
538 * remove the buffering now */
539 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
540 ssl_free_wbio_buffer(s);
541 /* else do it later in ssl3_write */
542
543 s->init_num=0;
544 s->new_session=0;
545
546 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
547 if (s->hit) s->ctx->stats.sess_hit++;
548
549 ret=1;
550 /* s->server=0; */
551 s->handshake_func=dtls1_connect;
552 s->ctx->stats.sess_connect_good++;
553
554 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
555
556 /* done with handshaking */
557 s->d1->handshake_read_seq = 0;
558 s->d1->next_handshake_write_seq = 0;
559 goto end;
560 /* break; */
561
562 default:
563 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
564 ret= -1;
565 goto end;
566 /* break; */
567 }
568
569 /* did we do anything */
570 if (!s->s3->tmp.reuse_message && !skip)
571 {
572 if (s->debug)
573 {
574 if ((ret=BIO_flush(s->wbio)) <= 0)
575 goto end;
576 }
577
578 if ((cb != NULL) && (s->state != state))
579 {
580 new_state=s->state;
581 s->state=state;
582 cb(s,SSL_CB_CONNECT_LOOP,1);
583 s->state=new_state;
584 }
585 }
586 skip=0;
587 }
588 end:
589 s->in_handshake--;
590 if (buf != NULL)
591 BUF_MEM_free(buf);
592 if (cb != NULL)
593 cb(s,SSL_CB_CONNECT_EXIT,ret);
594 return(ret);
595 }
596
dtls1_client_hello(SSL * s)597 int dtls1_client_hello(SSL *s)
598 {
599 unsigned char *buf;
600 unsigned char *p,*d;
601 unsigned int i,j;
602 unsigned long Time,l;
603 SSL_COMP *comp;
604
605 buf=(unsigned char *)s->init_buf->data;
606 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
607 {
608 SSL_SESSION *sess = s->session;
609 if ((s->session == NULL) ||
610 (s->session->ssl_version != s->version) ||
611 #ifdef OPENSSL_NO_TLSEXT
612 !sess->session_id_length ||
613 #else
614 (!sess->session_id_length && !sess->tlsext_tick) ||
615 #endif
616 (s->session->not_resumable))
617 {
618 if (!s->session_creation_enabled)
619 {
620 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
621 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_SESSION_MAY_NOT_BE_CREATED);
622 goto err;
623 }
624 if (!ssl_get_new_session(s,0))
625 goto err;
626 }
627 /* else use the pre-loaded session */
628
629 p=s->s3->client_random;
630
631 /* if client_random is initialized, reuse it, we are
632 * required to use same upon reply to HelloVerify */
633 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
634 if (i==sizeof(s->s3->client_random))
635 {
636 Time=(unsigned long)time(NULL); /* Time */
637 l2n(Time,p);
638 RAND_pseudo_bytes(p,sizeof(s->s3->client_random)-4);
639 }
640
641 /* Do the message type and length last */
642 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
643
644 *(p++)=s->version>>8;
645 *(p++)=s->version&0xff;
646 s->client_version=s->version;
647
648 /* Random stuff */
649 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
650 p+=SSL3_RANDOM_SIZE;
651
652 /* Session ID */
653 if (s->new_session)
654 i=0;
655 else
656 i=s->session->session_id_length;
657 *(p++)=i;
658 if (i != 0)
659 {
660 if (i > sizeof s->session->session_id)
661 {
662 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
663 goto err;
664 }
665 memcpy(p,s->session->session_id,i);
666 p+=i;
667 }
668
669 /* cookie stuff */
670 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
671 {
672 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
673 goto err;
674 }
675 *(p++) = s->d1->cookie_len;
676 memcpy(p, s->d1->cookie, s->d1->cookie_len);
677 p += s->d1->cookie_len;
678
679 /* Ciphers supported */
680 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
681 if (i == 0)
682 {
683 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
684 goto err;
685 }
686 s2n(i,p);
687 p+=i;
688
689 /* COMPRESSION */
690 if (s->ctx->comp_methods == NULL)
691 j=0;
692 else
693 j=sk_SSL_COMP_num(s->ctx->comp_methods);
694 *(p++)=1+j;
695 for (i=0; i<j; i++)
696 {
697 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
698 *(p++)=comp->id;
699 }
700 *(p++)=0; /* Add the NULL method */
701
702 #ifndef OPENSSL_NO_TLSEXT
703 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
704 {
705 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
706 goto err;
707 }
708 #endif
709
710 l=(p-d);
711 d=buf;
712
713 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
714
715 s->state=SSL3_ST_CW_CLNT_HELLO_B;
716 /* number of bytes to write */
717 s->init_num=p-buf;
718 s->init_off=0;
719
720 /* buffer the message to handle re-xmits */
721 dtls1_buffer_message(s, 0);
722 }
723
724 /* SSL3_ST_CW_CLNT_HELLO_B */
725 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
726 err:
727 return(-1);
728 }
729
dtls1_get_hello_verify(SSL * s)730 static int dtls1_get_hello_verify(SSL *s)
731 {
732 int n, al, ok = 0;
733 unsigned char *data;
734 unsigned int cookie_len;
735
736 n=s->method->ssl_get_message(s,
737 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
738 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
739 -1,
740 s->max_cert_list,
741 &ok);
742
743 if (!ok) return((int)n);
744
745 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
746 {
747 s->d1->send_cookie = 0;
748 s->s3->tmp.reuse_message=1;
749 return(1);
750 }
751
752 data = (unsigned char *)s->init_msg;
753
754 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
755 {
756 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
757 s->version=(s->version&0xff00)|data[1];
758 al = SSL_AD_PROTOCOL_VERSION;
759 goto f_err;
760 }
761 data+=2;
762
763 cookie_len = *(data++);
764 if ( cookie_len > sizeof(s->d1->cookie))
765 {
766 al=SSL_AD_ILLEGAL_PARAMETER;
767 goto f_err;
768 }
769
770 memcpy(s->d1->cookie, data, cookie_len);
771 s->d1->cookie_len = cookie_len;
772
773 s->d1->send_cookie = 1;
774 return 1;
775
776 f_err:
777 ssl3_send_alert(s, SSL3_AL_FATAL, al);
778 return -1;
779 }
780
dtls1_send_client_key_exchange(SSL * s)781 int dtls1_send_client_key_exchange(SSL *s)
782 {
783 unsigned char *p,*d;
784 int n;
785 unsigned long alg_k;
786 #ifndef OPENSSL_NO_RSA
787 unsigned char *q;
788 EVP_PKEY *pkey=NULL;
789 #endif
790 #ifndef OPENSSL_NO_KRB5
791 KSSL_ERR kssl_err;
792 #endif /* OPENSSL_NO_KRB5 */
793 #ifndef OPENSSL_NO_ECDH
794 EC_KEY *clnt_ecdh = NULL;
795 const EC_POINT *srvr_ecpoint = NULL;
796 EVP_PKEY *srvr_pub_pkey = NULL;
797 unsigned char *encodedPoint = NULL;
798 int encoded_pt_len = 0;
799 BN_CTX * bn_ctx = NULL;
800 #endif
801
802 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
803 {
804 d=(unsigned char *)s->init_buf->data;
805 p= &(d[DTLS1_HM_HEADER_LENGTH]);
806
807 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
808
809 /* Fool emacs indentation */
810 if (0) {}
811 #ifndef OPENSSL_NO_RSA
812 else if (alg_k & SSL_kRSA)
813 {
814 RSA *rsa;
815 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
816
817 if (s->session->sess_cert->peer_rsa_tmp != NULL)
818 rsa=s->session->sess_cert->peer_rsa_tmp;
819 else
820 {
821 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
822 if ((pkey == NULL) ||
823 (pkey->type != EVP_PKEY_RSA) ||
824 (pkey->pkey.rsa == NULL))
825 {
826 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
827 goto err;
828 }
829 rsa=pkey->pkey.rsa;
830 EVP_PKEY_free(pkey);
831 }
832
833 tmp_buf[0]=s->client_version>>8;
834 tmp_buf[1]=s->client_version&0xff;
835 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
836 goto err;
837
838 s->session->master_key_length=sizeof tmp_buf;
839
840 q=p;
841 /* Fix buf for TLS and [incidentally] DTLS */
842 if (s->version > SSL3_VERSION)
843 p+=2;
844 n=RSA_public_encrypt(sizeof tmp_buf,
845 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
846 #ifdef PKCS1_CHECK
847 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
848 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
849 #endif
850 if (n <= 0)
851 {
852 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
853 goto err;
854 }
855
856 /* Fix buf for TLS and [incidentally] DTLS */
857 if (s->version > SSL3_VERSION)
858 {
859 s2n(n,q);
860 n+=2;
861 }
862
863 s->session->master_key_length=
864 s->method->ssl3_enc->generate_master_secret(s,
865 s->session->master_key,
866 tmp_buf,sizeof tmp_buf);
867 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
868 }
869 #endif
870 #ifndef OPENSSL_NO_KRB5
871 else if (alg_k & SSL_kKRB5)
872 {
873 krb5_error_code krb5rc;
874 KSSL_CTX *kssl_ctx = s->kssl_ctx;
875 /* krb5_data krb5_ap_req; */
876 krb5_data *enc_ticket;
877 krb5_data authenticator, *authp = NULL;
878 EVP_CIPHER_CTX ciph_ctx;
879 const EVP_CIPHER *enc = NULL;
880 unsigned char iv[EVP_MAX_IV_LENGTH];
881 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
882 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
883 + EVP_MAX_IV_LENGTH];
884 int padl, outl = sizeof(epms);
885
886 EVP_CIPHER_CTX_init(&ciph_ctx);
887
888 #ifdef KSSL_DEBUG
889 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
890 alg_k, SSL_kKRB5);
891 #endif /* KSSL_DEBUG */
892
893 authp = NULL;
894 #ifdef KRB5SENDAUTH
895 if (KRB5SENDAUTH) authp = &authenticator;
896 #endif /* KRB5SENDAUTH */
897
898 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
899 &kssl_err);
900 enc = kssl_map_enc(kssl_ctx->enctype);
901 if (enc == NULL)
902 goto err;
903 #ifdef KSSL_DEBUG
904 {
905 printf("kssl_cget_tkt rtn %d\n", krb5rc);
906 if (krb5rc && kssl_err.text)
907 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
908 }
909 #endif /* KSSL_DEBUG */
910
911 if (krb5rc)
912 {
913 ssl3_send_alert(s,SSL3_AL_FATAL,
914 SSL_AD_HANDSHAKE_FAILURE);
915 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
916 kssl_err.reason);
917 goto err;
918 }
919
920 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
921 ** in place of RFC 2712 KerberosWrapper, as in:
922 **
923 ** Send ticket (copy to *p, set n = length)
924 ** n = krb5_ap_req.length;
925 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
926 ** if (krb5_ap_req.data)
927 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
928 **
929 ** Now using real RFC 2712 KerberosWrapper
930 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
931 ** Note: 2712 "opaque" types are here replaced
932 ** with a 2-byte length followed by the value.
933 ** Example:
934 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
935 ** Where "xx xx" = length bytes. Shown here with
936 ** optional authenticator omitted.
937 */
938
939 /* KerberosWrapper.Ticket */
940 s2n(enc_ticket->length,p);
941 memcpy(p, enc_ticket->data, enc_ticket->length);
942 p+= enc_ticket->length;
943 n = enc_ticket->length + 2;
944
945 /* KerberosWrapper.Authenticator */
946 if (authp && authp->length)
947 {
948 s2n(authp->length,p);
949 memcpy(p, authp->data, authp->length);
950 p+= authp->length;
951 n+= authp->length + 2;
952
953 free(authp->data);
954 authp->data = NULL;
955 authp->length = 0;
956 }
957 else
958 {
959 s2n(0,p);/* null authenticator length */
960 n+=2;
961 }
962
963 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
964 goto err;
965
966 /* 20010420 VRS. Tried it this way; failed.
967 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
968 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
969 ** kssl_ctx->length);
970 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
971 */
972
973 memset(iv, 0, sizeof iv); /* per RFC 1510 */
974 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
975 kssl_ctx->key,iv);
976 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
977 sizeof tmp_buf);
978 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
979 outl += padl;
980 if (outl > (int)sizeof epms)
981 {
982 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
983 goto err;
984 }
985 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
986
987 /* KerberosWrapper.EncryptedPreMasterSecret */
988 s2n(outl,p);
989 memcpy(p, epms, outl);
990 p+=outl;
991 n+=outl + 2;
992
993 s->session->master_key_length=
994 s->method->ssl3_enc->generate_master_secret(s,
995 s->session->master_key,
996 tmp_buf, sizeof tmp_buf);
997
998 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
999 OPENSSL_cleanse(epms, outl);
1000 }
1001 #endif
1002 #ifndef OPENSSL_NO_DH
1003 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1004 {
1005 DH *dh_srvr,*dh_clnt;
1006
1007 if (s->session->sess_cert->peer_dh_tmp != NULL)
1008 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1009 else
1010 {
1011 /* we get them from the cert */
1012 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1013 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1014 goto err;
1015 }
1016
1017 /* generate a new random key */
1018 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1019 {
1020 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1021 goto err;
1022 }
1023 if (!DH_generate_key(dh_clnt))
1024 {
1025 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1026 goto err;
1027 }
1028
1029 /* use the 'p' output buffer for the DH key, but
1030 * make sure to clear it out afterwards */
1031
1032 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1033
1034 if (n <= 0)
1035 {
1036 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1037 goto err;
1038 }
1039
1040 /* generate master key from the result */
1041 s->session->master_key_length=
1042 s->method->ssl3_enc->generate_master_secret(s,
1043 s->session->master_key,p,n);
1044 /* clean up */
1045 memset(p,0,n);
1046
1047 /* send off the data */
1048 n=BN_num_bytes(dh_clnt->pub_key);
1049 s2n(n,p);
1050 BN_bn2bin(dh_clnt->pub_key,p);
1051 n+=2;
1052
1053 DH_free(dh_clnt);
1054
1055 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1056 }
1057 #endif
1058 #ifndef OPENSSL_NO_ECDH
1059 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
1060 {
1061 const EC_GROUP *srvr_group = NULL;
1062 EC_KEY *tkey;
1063 int ecdh_clnt_cert = 0;
1064 int field_size = 0;
1065
1066 /* Did we send out the client's
1067 * ECDH share for use in premaster
1068 * computation as part of client certificate?
1069 * If so, set ecdh_clnt_cert to 1.
1070 */
1071 if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
1072 {
1073 /* XXX: For now, we do not support client
1074 * authentication using ECDH certificates.
1075 * To add such support, one needs to add
1076 * code that checks for appropriate
1077 * conditions and sets ecdh_clnt_cert to 1.
1078 * For example, the cert have an ECC
1079 * key on the same curve as the server's
1080 * and the key should be authorized for
1081 * key agreement.
1082 *
1083 * One also needs to add code in ssl3_connect
1084 * to skip sending the certificate verify
1085 * message.
1086 *
1087 * if ((s->cert->key->privatekey != NULL) &&
1088 * (s->cert->key->privatekey->type ==
1089 * EVP_PKEY_EC) && ...)
1090 * ecdh_clnt_cert = 1;
1091 */
1092 }
1093
1094 if (s->session->sess_cert->peer_ecdh_tmp != NULL)
1095 {
1096 tkey = s->session->sess_cert->peer_ecdh_tmp;
1097 }
1098 else
1099 {
1100 /* Get the Server Public Key from Cert */
1101 srvr_pub_pkey = X509_get_pubkey(s->session-> \
1102 sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1103 if ((srvr_pub_pkey == NULL) ||
1104 (srvr_pub_pkey->type != EVP_PKEY_EC) ||
1105 (srvr_pub_pkey->pkey.ec == NULL))
1106 {
1107 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1108 ERR_R_INTERNAL_ERROR);
1109 goto err;
1110 }
1111
1112 tkey = srvr_pub_pkey->pkey.ec;
1113 }
1114
1115 srvr_group = EC_KEY_get0_group(tkey);
1116 srvr_ecpoint = EC_KEY_get0_public_key(tkey);
1117
1118 if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
1119 {
1120 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1121 ERR_R_INTERNAL_ERROR);
1122 goto err;
1123 }
1124
1125 if ((clnt_ecdh=EC_KEY_new()) == NULL)
1126 {
1127 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1128 goto err;
1129 }
1130
1131 if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
1132 {
1133 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1134 goto err;
1135 }
1136 if (ecdh_clnt_cert)
1137 {
1138 /* Reuse key info from our certificate
1139 * We only need our private key to perform
1140 * the ECDH computation.
1141 */
1142 const BIGNUM *priv_key;
1143 tkey = s->cert->key->privatekey->pkey.ec;
1144 priv_key = EC_KEY_get0_private_key(tkey);
1145 if (priv_key == NULL)
1146 {
1147 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1148 goto err;
1149 }
1150 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
1151 {
1152 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
1153 goto err;
1154 }
1155 }
1156 else
1157 {
1158 /* Generate a new ECDH key pair */
1159 if (!(EC_KEY_generate_key(clnt_ecdh)))
1160 {
1161 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
1162 goto err;
1163 }
1164 }
1165
1166 /* use the 'p' output buffer for the ECDH key, but
1167 * make sure to clear it out afterwards
1168 */
1169
1170 field_size = EC_GROUP_get_degree(srvr_group);
1171 if (field_size <= 0)
1172 {
1173 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1174 ERR_R_ECDH_LIB);
1175 goto err;
1176 }
1177 n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
1178 if (n <= 0)
1179 {
1180 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1181 ERR_R_ECDH_LIB);
1182 goto err;
1183 }
1184
1185 /* generate master key from the result */
1186 s->session->master_key_length = s->method->ssl3_enc \
1187 -> generate_master_secret(s,
1188 s->session->master_key,
1189 p, n);
1190
1191 memset(p, 0, n); /* clean up */
1192
1193 if (ecdh_clnt_cert)
1194 {
1195 /* Send empty client key exch message */
1196 n = 0;
1197 }
1198 else
1199 {
1200 /* First check the size of encoding and
1201 * allocate memory accordingly.
1202 */
1203 encoded_pt_len =
1204 EC_POINT_point2oct(srvr_group,
1205 EC_KEY_get0_public_key(clnt_ecdh),
1206 POINT_CONVERSION_UNCOMPRESSED,
1207 NULL, 0, NULL);
1208
1209 encodedPoint = (unsigned char *)
1210 OPENSSL_malloc(encoded_pt_len *
1211 sizeof(unsigned char));
1212 bn_ctx = BN_CTX_new();
1213 if ((encodedPoint == NULL) ||
1214 (bn_ctx == NULL))
1215 {
1216 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1217 goto err;
1218 }
1219
1220 /* Encode the public key */
1221 n = EC_POINT_point2oct(srvr_group,
1222 EC_KEY_get0_public_key(clnt_ecdh),
1223 POINT_CONVERSION_UNCOMPRESSED,
1224 encodedPoint, encoded_pt_len, bn_ctx);
1225
1226 *p = n; /* length of encoded point */
1227 /* Encoded point will be copied here */
1228 p += 1;
1229 /* copy the point */
1230 memcpy((unsigned char *)p, encodedPoint, n);
1231 /* increment n to account for length field */
1232 n += 1;
1233 }
1234
1235 /* Free allocated memory */
1236 BN_CTX_free(bn_ctx);
1237 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1238 if (clnt_ecdh != NULL)
1239 EC_KEY_free(clnt_ecdh);
1240 EVP_PKEY_free(srvr_pub_pkey);
1241 }
1242 #endif /* !OPENSSL_NO_ECDH */
1243
1244 #ifndef OPENSSL_NO_PSK
1245 else if (alg_k & SSL_kPSK)
1246 {
1247 char identity[PSK_MAX_IDENTITY_LEN];
1248 unsigned char *t = NULL;
1249 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
1250 unsigned int pre_ms_len = 0, psk_len = 0;
1251 int psk_err = 1;
1252
1253 n = 0;
1254 if (s->psk_client_callback == NULL)
1255 {
1256 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1257 SSL_R_PSK_NO_CLIENT_CB);
1258 goto err;
1259 }
1260
1261 psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
1262 identity, PSK_MAX_IDENTITY_LEN,
1263 psk_or_pre_ms, sizeof(psk_or_pre_ms));
1264 if (psk_len > PSK_MAX_PSK_LEN)
1265 {
1266 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1267 ERR_R_INTERNAL_ERROR);
1268 goto psk_err;
1269 }
1270 else if (psk_len == 0)
1271 {
1272 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1273 SSL_R_PSK_IDENTITY_NOT_FOUND);
1274 goto psk_err;
1275 }
1276
1277 /* create PSK pre_master_secret */
1278 pre_ms_len = 2+psk_len+2+psk_len;
1279 t = psk_or_pre_ms;
1280 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
1281 s2n(psk_len, t);
1282 memset(t, 0, psk_len);
1283 t+=psk_len;
1284 s2n(psk_len, t);
1285
1286 if (s->session->psk_identity_hint != NULL)
1287 OPENSSL_free(s->session->psk_identity_hint);
1288 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
1289 if (s->ctx->psk_identity_hint != NULL &&
1290 s->session->psk_identity_hint == NULL)
1291 {
1292 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1293 ERR_R_MALLOC_FAILURE);
1294 goto psk_err;
1295 }
1296
1297 if (s->session->psk_identity != NULL)
1298 OPENSSL_free(s->session->psk_identity);
1299 s->session->psk_identity = BUF_strdup(identity);
1300 if (s->session->psk_identity == NULL)
1301 {
1302 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1303 ERR_R_MALLOC_FAILURE);
1304 goto psk_err;
1305 }
1306
1307 s->session->master_key_length =
1308 s->method->ssl3_enc->generate_master_secret(s,
1309 s->session->master_key,
1310 psk_or_pre_ms, pre_ms_len);
1311 n = strlen(identity);
1312 s2n(n, p);
1313 memcpy(p, identity, n);
1314 n+=2;
1315 psk_err = 0;
1316 psk_err:
1317 OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
1318 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
1319 if (psk_err != 0)
1320 {
1321 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1322 goto err;
1323 }
1324 }
1325 #endif
1326 else
1327 {
1328 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1329 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1330 goto err;
1331 }
1332
1333 d = dtls1_set_message_header(s, d,
1334 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1335 /*
1336 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1337 l2n3(n,d);
1338 l2n(s->d1->handshake_write_seq,d);
1339 s->d1->handshake_write_seq++;
1340 */
1341
1342 s->state=SSL3_ST_CW_KEY_EXCH_B;
1343 /* number of bytes to write */
1344 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1345 s->init_off=0;
1346
1347 /* buffer the message to handle re-xmits */
1348 dtls1_buffer_message(s, 0);
1349 }
1350
1351 /* SSL3_ST_CW_KEY_EXCH_B */
1352 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1353 err:
1354 #ifndef OPENSSL_NO_ECDH
1355 BN_CTX_free(bn_ctx);
1356 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1357 if (clnt_ecdh != NULL)
1358 EC_KEY_free(clnt_ecdh);
1359 EVP_PKEY_free(srvr_pub_pkey);
1360 #endif
1361 return(-1);
1362 }
1363
dtls1_send_client_verify(SSL * s)1364 int dtls1_send_client_verify(SSL *s)
1365 {
1366 unsigned char *p,*d;
1367 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1368 EVP_PKEY *pkey;
1369 #ifndef OPENSSL_NO_RSA
1370 unsigned u=0;
1371 #endif
1372 unsigned long n;
1373 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
1374 int j;
1375 #endif
1376
1377 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1378 {
1379 d=(unsigned char *)s->init_buf->data;
1380 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1381 pkey=s->cert->key->privatekey;
1382
1383 s->method->ssl3_enc->cert_verify_mac(s,
1384 NID_sha1,
1385 &(data[MD5_DIGEST_LENGTH]));
1386
1387 #ifndef OPENSSL_NO_RSA
1388 if (pkey->type == EVP_PKEY_RSA)
1389 {
1390 s->method->ssl3_enc->cert_verify_mac(s,
1391 NID_md5,
1392 &(data[0]));
1393 if (RSA_sign(NID_md5_sha1, data,
1394 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1395 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1396 {
1397 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1398 goto err;
1399 }
1400 s2n(u,p);
1401 n=u+2;
1402 }
1403 else
1404 #endif
1405 #ifndef OPENSSL_NO_DSA
1406 if (pkey->type == EVP_PKEY_DSA)
1407 {
1408 if (!DSA_sign(pkey->save_type,
1409 &(data[MD5_DIGEST_LENGTH]),
1410 SHA_DIGEST_LENGTH,&(p[2]),
1411 (unsigned int *)&j,pkey->pkey.dsa))
1412 {
1413 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1414 goto err;
1415 }
1416 s2n(j,p);
1417 n=j+2;
1418 }
1419 else
1420 #endif
1421 #ifndef OPENSSL_NO_ECDSA
1422 if (pkey->type == EVP_PKEY_EC)
1423 {
1424 if (!ECDSA_sign(pkey->save_type,
1425 &(data[MD5_DIGEST_LENGTH]),
1426 SHA_DIGEST_LENGTH,&(p[2]),
1427 (unsigned int *)&j,pkey->pkey.ec))
1428 {
1429 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,
1430 ERR_R_ECDSA_LIB);
1431 goto err;
1432 }
1433 s2n(j,p);
1434 n=j+2;
1435 }
1436 else
1437 #endif
1438 {
1439 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1440 goto err;
1441 }
1442
1443 d = dtls1_set_message_header(s, d,
1444 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1445
1446 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1447 s->init_off=0;
1448
1449 /* buffer the message to handle re-xmits */
1450 dtls1_buffer_message(s, 0);
1451
1452 s->state = SSL3_ST_CW_CERT_VRFY_B;
1453 }
1454
1455 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1456 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1457 err:
1458 return(-1);
1459 }
1460
dtls1_send_client_certificate(SSL * s)1461 int dtls1_send_client_certificate(SSL *s)
1462 {
1463 X509 *x509=NULL;
1464 EVP_PKEY *pkey=NULL;
1465 int i;
1466 unsigned long l;
1467
1468 if (s->state == SSL3_ST_CW_CERT_A)
1469 {
1470 if ((s->cert == NULL) ||
1471 (s->cert->key->x509 == NULL) ||
1472 (s->cert->key->privatekey == NULL))
1473 s->state=SSL3_ST_CW_CERT_B;
1474 else
1475 s->state=SSL3_ST_CW_CERT_C;
1476 }
1477
1478 /* We need to get a client cert */
1479 if (s->state == SSL3_ST_CW_CERT_B)
1480 {
1481 /* If we get an error, we need to
1482 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1483 * We then get retied later */
1484 i=0;
1485 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1486 if (i < 0)
1487 {
1488 s->rwstate=SSL_X509_LOOKUP;
1489 return(-1);
1490 }
1491 s->rwstate=SSL_NOTHING;
1492 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1493 {
1494 s->state=SSL3_ST_CW_CERT_B;
1495 if ( !SSL_use_certificate(s,x509) ||
1496 !SSL_use_PrivateKey(s,pkey))
1497 i=0;
1498 }
1499 else if (i == 1)
1500 {
1501 i=0;
1502 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1503 }
1504
1505 if (x509 != NULL) X509_free(x509);
1506 if (pkey != NULL) EVP_PKEY_free(pkey);
1507 if (i == 0)
1508 {
1509 if (s->version == SSL3_VERSION)
1510 {
1511 s->s3->tmp.cert_req=0;
1512 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1513 return(1);
1514 }
1515 else
1516 {
1517 s->s3->tmp.cert_req=2;
1518 }
1519 }
1520
1521 /* Ok, we have a cert */
1522 s->state=SSL3_ST_CW_CERT_C;
1523 }
1524
1525 if (s->state == SSL3_ST_CW_CERT_C)
1526 {
1527 s->state=SSL3_ST_CW_CERT_D;
1528 l=dtls1_output_cert_chain(s,
1529 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1530 s->init_num=(int)l;
1531 s->init_off=0;
1532
1533 /* set header called by dtls1_output_cert_chain() */
1534
1535 /* buffer the message to handle re-xmits */
1536 dtls1_buffer_message(s, 0);
1537 }
1538 /* SSL3_ST_CW_CERT_D */
1539 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1540 }
1541
1542
1543