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 "kssl_lcl.h"
119 #include <openssl/buffer.h>
120 #include <openssl/rand.h>
121 #include <openssl/objects.h>
122 #include <openssl/evp.h>
123 #include <openssl/md5.h>
124 #ifndef OPENSSL_NO_DH
125 #include <openssl/dh.h>
126 #endif
127
128 static SSL_METHOD *dtls1_get_client_method(int ver);
129 static int dtls1_get_hello_verify(SSL *s);
130
dtls1_get_client_method(int ver)131 static 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
IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,ssl_undefined_function,dtls1_connect,dtls1_get_client_method)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=(unsigned long)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 s->state=SSL3_ST_CW_CLNT_HELLO_A;
218 s->ctx->stats.sess_connect++;
219 s->init_num=0;
220 /* mark client_random uninitialized */
221 memset(s->s3->client_random,0,sizeof(s->s3->client_random));
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
229 /* every DTLS ClientHello resets Finished MAC */
230 ssl3_init_finished_mac(s);
231
232 ret=dtls1_client_hello(s);
233 if (ret <= 0) goto end;
234
235 if ( s->d1->send_cookie)
236 {
237 s->state=SSL3_ST_CW_FLUSH;
238 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
239 }
240 else
241 s->state=SSL3_ST_CR_SRVR_HELLO_A;
242
243 s->init_num=0;
244
245 /* turn on buffering for the next lot of output */
246 if (s->bbio != s->wbio)
247 s->wbio=BIO_push(s->bbio,s->wbio);
248
249 break;
250
251 case SSL3_ST_CR_SRVR_HELLO_A:
252 case SSL3_ST_CR_SRVR_HELLO_B:
253 ret=ssl3_get_server_hello(s);
254 if (ret <= 0) goto end;
255 else
256 {
257 if (s->hit)
258 s->state=SSL3_ST_CR_FINISHED_A;
259 else
260 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
261 }
262 s->init_num=0;
263 break;
264
265 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
266 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
267
268 ret = dtls1_get_hello_verify(s);
269 if ( ret <= 0)
270 goto end;
271 if ( s->d1->send_cookie) /* start again, with a cookie */
272 s->state=SSL3_ST_CW_CLNT_HELLO_A;
273 else
274 s->state = SSL3_ST_CR_CERT_A;
275 s->init_num = 0;
276 break;
277
278 case SSL3_ST_CR_CERT_A:
279 case SSL3_ST_CR_CERT_B:
280 /* Check if it is anon DH */
281 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
282 {
283 ret=ssl3_get_server_certificate(s);
284 if (ret <= 0) goto end;
285 }
286 else
287 skip=1;
288 s->state=SSL3_ST_CR_KEY_EXCH_A;
289 s->init_num=0;
290 break;
291
292 case SSL3_ST_CR_KEY_EXCH_A:
293 case SSL3_ST_CR_KEY_EXCH_B:
294 ret=ssl3_get_key_exchange(s);
295 if (ret <= 0) goto end;
296 s->state=SSL3_ST_CR_CERT_REQ_A;
297 s->init_num=0;
298
299 /* at this point we check that we have the
300 * required stuff from the server */
301 if (!ssl3_check_cert_and_algorithm(s))
302 {
303 ret= -1;
304 goto end;
305 }
306 break;
307
308 case SSL3_ST_CR_CERT_REQ_A:
309 case SSL3_ST_CR_CERT_REQ_B:
310 ret=ssl3_get_certificate_request(s);
311 if (ret <= 0) goto end;
312 s->state=SSL3_ST_CR_SRVR_DONE_A;
313 s->init_num=0;
314 break;
315
316 case SSL3_ST_CR_SRVR_DONE_A:
317 case SSL3_ST_CR_SRVR_DONE_B:
318 ret=ssl3_get_server_done(s);
319 if (ret <= 0) goto end;
320 if (s->s3->tmp.cert_req)
321 s->state=SSL3_ST_CW_CERT_A;
322 else
323 s->state=SSL3_ST_CW_KEY_EXCH_A;
324 s->init_num=0;
325
326 break;
327
328 case SSL3_ST_CW_CERT_A:
329 case SSL3_ST_CW_CERT_B:
330 case SSL3_ST_CW_CERT_C:
331 case SSL3_ST_CW_CERT_D:
332 ret=dtls1_send_client_certificate(s);
333 if (ret <= 0) goto end;
334 s->state=SSL3_ST_CW_KEY_EXCH_A;
335 s->init_num=0;
336 break;
337
338 case SSL3_ST_CW_KEY_EXCH_A:
339 case SSL3_ST_CW_KEY_EXCH_B:
340 ret=dtls1_send_client_key_exchange(s);
341 if (ret <= 0) goto end;
342 l=s->s3->tmp.new_cipher->algorithms;
343 /* EAY EAY EAY need to check for DH fix cert
344 * sent back */
345 /* For TLS, cert_req is set to 2, so a cert chain
346 * of nothing is sent, but no verify packet is sent */
347 if (s->s3->tmp.cert_req == 1)
348 {
349 s->state=SSL3_ST_CW_CERT_VRFY_A;
350 }
351 else
352 {
353 s->state=SSL3_ST_CW_CHANGE_A;
354 s->s3->change_cipher_spec=0;
355 }
356
357 s->init_num=0;
358 break;
359
360 case SSL3_ST_CW_CERT_VRFY_A:
361 case SSL3_ST_CW_CERT_VRFY_B:
362 ret=dtls1_send_client_verify(s);
363 if (ret <= 0) goto end;
364 s->state=SSL3_ST_CW_CHANGE_A;
365 s->init_num=0;
366 s->s3->change_cipher_spec=0;
367 break;
368
369 case SSL3_ST_CW_CHANGE_A:
370 case SSL3_ST_CW_CHANGE_B:
371 ret=dtls1_send_change_cipher_spec(s,
372 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
373 if (ret <= 0) goto end;
374 s->state=SSL3_ST_CW_FINISHED_A;
375 s->init_num=0;
376
377 s->session->cipher=s->s3->tmp.new_cipher;
378 #ifdef OPENSSL_NO_COMP
379 s->session->compress_meth=0;
380 #else
381 if (s->s3->tmp.new_compression == NULL)
382 s->session->compress_meth=0;
383 else
384 s->session->compress_meth=
385 s->s3->tmp.new_compression->id;
386 #endif
387 if (!s->method->ssl3_enc->setup_key_block(s))
388 {
389 ret= -1;
390 goto end;
391 }
392
393 if (!s->method->ssl3_enc->change_cipher_state(s,
394 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
395 {
396 ret= -1;
397 goto end;
398 }
399
400 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
401 break;
402
403 case SSL3_ST_CW_FINISHED_A:
404 case SSL3_ST_CW_FINISHED_B:
405 ret=dtls1_send_finished(s,
406 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
407 s->method->ssl3_enc->client_finished_label,
408 s->method->ssl3_enc->client_finished_label_len);
409 if (ret <= 0) goto end;
410 s->state=SSL3_ST_CW_FLUSH;
411
412 /* clear flags */
413 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
414 if (s->hit)
415 {
416 s->s3->tmp.next_state=SSL_ST_OK;
417 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
418 {
419 s->state=SSL_ST_OK;
420 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
421 s->s3->delay_buf_pop_ret=0;
422 }
423 }
424 else
425 {
426 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
427 }
428 s->init_num=0;
429 /* mark client_random uninitialized */
430 memset (s->s3->client_random,0,sizeof(s->s3->client_random));
431
432 break;
433
434 case SSL3_ST_CR_FINISHED_A:
435 case SSL3_ST_CR_FINISHED_B:
436
437 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
438 SSL3_ST_CR_FINISHED_B);
439 if (ret <= 0) goto end;
440
441 if (s->hit)
442 s->state=SSL3_ST_CW_CHANGE_A;
443 else
444 s->state=SSL_ST_OK;
445 s->init_num=0;
446 break;
447
448 case SSL3_ST_CW_FLUSH:
449 /* number of bytes to be flushed */
450 num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
451 if (num1 > 0)
452 {
453 s->rwstate=SSL_WRITING;
454 num1=BIO_flush(s->wbio);
455 if (num1 <= 0) { ret= -1; goto end; }
456 s->rwstate=SSL_NOTHING;
457 }
458
459 s->state=s->s3->tmp.next_state;
460 break;
461
462 case SSL_ST_OK:
463 /* clean a few things up */
464 ssl3_cleanup_key_block(s);
465
466 #if 0
467 if (s->init_buf != NULL)
468 {
469 BUF_MEM_free(s->init_buf);
470 s->init_buf=NULL;
471 }
472 #endif
473
474 /* If we are not 'joining' the last two packets,
475 * remove the buffering now */
476 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
477 ssl_free_wbio_buffer(s);
478 /* else do it later in ssl3_write */
479
480 s->init_num=0;
481 s->new_session=0;
482
483 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
484 if (s->hit) s->ctx->stats.sess_hit++;
485
486 ret=1;
487 /* s->server=0; */
488 s->handshake_func=dtls1_connect;
489 s->ctx->stats.sess_connect_good++;
490
491 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
492
493 /* done with handshaking */
494 s->d1->handshake_read_seq = 0;
495 goto end;
496 /* break; */
497
498 default:
499 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
500 ret= -1;
501 goto end;
502 /* break; */
503 }
504
505 /* did we do anything */
506 if (!s->s3->tmp.reuse_message && !skip)
507 {
508 if (s->debug)
509 {
510 if ((ret=BIO_flush(s->wbio)) <= 0)
511 goto end;
512 }
513
514 if ((cb != NULL) && (s->state != state))
515 {
516 new_state=s->state;
517 s->state=state;
518 cb(s,SSL_CB_CONNECT_LOOP,1);
519 s->state=new_state;
520 }
521 }
522 skip=0;
523 }
524 end:
525 s->in_handshake--;
526 if (buf != NULL)
527 BUF_MEM_free(buf);
528 if (cb != NULL)
529 cb(s,SSL_CB_CONNECT_EXIT,ret);
530 return(ret);
531 }
532
dtls1_client_hello(SSL * s)533 int dtls1_client_hello(SSL *s)
534 {
535 unsigned char *buf;
536 unsigned char *p,*d;
537 unsigned int i,j;
538 unsigned long Time,l;
539 SSL_COMP *comp;
540
541 buf=(unsigned char *)s->init_buf->data;
542 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
543 {
544 if ((s->session == NULL) ||
545 (s->session->ssl_version != s->version) ||
546 (s->session->not_resumable))
547 {
548 if (!ssl_get_new_session(s,0))
549 goto err;
550 }
551 /* else use the pre-loaded session */
552
553 p=s->s3->client_random;
554 /* if client_random is initialized, reuse it, we are
555 * required to use same upon reply to HelloVerify */
556 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
557 if (i==sizeof(s->s3->client_random))
558 {
559 Time=(unsigned long)time(NULL); /* Time */
560 l2n(Time,p);
561 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
562 }
563
564 /* Do the message type and length last */
565 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
566
567 *(p++)=s->version>>8;
568 *(p++)=s->version&0xff;
569 s->client_version=s->version;
570
571 /* Random stuff */
572 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
573 p+=SSL3_RANDOM_SIZE;
574
575 /* Session ID */
576 if (s->new_session)
577 i=0;
578 else
579 i=s->session->session_id_length;
580 *(p++)=i;
581 if (i != 0)
582 {
583 if (i > sizeof s->session->session_id)
584 {
585 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
586 goto err;
587 }
588 memcpy(p,s->session->session_id,i);
589 p+=i;
590 }
591
592 /* cookie stuff */
593 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
594 {
595 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
596 goto err;
597 }
598 *(p++) = s->d1->cookie_len;
599 memcpy(p, s->d1->cookie, s->d1->cookie_len);
600 p += s->d1->cookie_len;
601
602 /* Ciphers supported */
603 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
604 if (i == 0)
605 {
606 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
607 goto err;
608 }
609 s2n(i,p);
610 p+=i;
611
612 /* COMPRESSION */
613 if (s->ctx->comp_methods == NULL)
614 j=0;
615 else
616 j=sk_SSL_COMP_num(s->ctx->comp_methods);
617 *(p++)=1+j;
618 for (i=0; i<j; i++)
619 {
620 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
621 *(p++)=comp->id;
622 }
623 *(p++)=0; /* Add the NULL method */
624
625 l=(p-d);
626 d=buf;
627
628 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
629
630 s->state=SSL3_ST_CW_CLNT_HELLO_B;
631 /* number of bytes to write */
632 s->init_num=p-buf;
633 s->init_off=0;
634
635 /* buffer the message to handle re-xmits */
636 dtls1_buffer_message(s, 0);
637 }
638
639 /* SSL3_ST_CW_CLNT_HELLO_B */
640 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
641 err:
642 return(-1);
643 }
644
dtls1_get_hello_verify(SSL * s)645 static int dtls1_get_hello_verify(SSL *s)
646 {
647 int n, al, ok = 0;
648 unsigned char *data;
649 unsigned int cookie_len;
650
651 n=s->method->ssl_get_message(s,
652 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
653 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
654 -1,
655 s->max_cert_list,
656 &ok);
657
658 if (!ok) return((int)n);
659
660 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
661 {
662 s->d1->send_cookie = 0;
663 s->s3->tmp.reuse_message=1;
664 return(1);
665 }
666
667 data = (unsigned char *)s->init_msg;
668
669 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
670 {
671 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
672 s->version=(s->version&0xff00)|data[1];
673 al = SSL_AD_PROTOCOL_VERSION;
674 goto f_err;
675 }
676 data+=2;
677
678 cookie_len = *(data++);
679 if ( cookie_len > sizeof(s->d1->cookie))
680 {
681 al=SSL_AD_ILLEGAL_PARAMETER;
682 goto f_err;
683 }
684
685 memcpy(s->d1->cookie, data, cookie_len);
686 s->d1->cookie_len = cookie_len;
687
688 s->d1->send_cookie = 1;
689 return 1;
690
691 f_err:
692 ssl3_send_alert(s, SSL3_AL_FATAL, al);
693 return -1;
694 }
695
dtls1_send_client_key_exchange(SSL * s)696 int dtls1_send_client_key_exchange(SSL *s)
697 {
698 unsigned char *p,*d;
699 int n;
700 unsigned long l;
701 #ifndef OPENSSL_NO_RSA
702 unsigned char *q;
703 EVP_PKEY *pkey=NULL;
704 #endif
705 #ifndef OPENSSL_NO_KRB5
706 KSSL_ERR kssl_err;
707 #endif /* OPENSSL_NO_KRB5 */
708
709 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
710 {
711 d=(unsigned char *)s->init_buf->data;
712 p= &(d[DTLS1_HM_HEADER_LENGTH]);
713
714 l=s->s3->tmp.new_cipher->algorithms;
715
716 /* Fool emacs indentation */
717 if (0) {}
718 #ifndef OPENSSL_NO_RSA
719 else if (l & SSL_kRSA)
720 {
721 RSA *rsa;
722 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
723
724 if (s->session->sess_cert->peer_rsa_tmp != NULL)
725 rsa=s->session->sess_cert->peer_rsa_tmp;
726 else
727 {
728 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
729 if ((pkey == NULL) ||
730 (pkey->type != EVP_PKEY_RSA) ||
731 (pkey->pkey.rsa == NULL))
732 {
733 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
734 goto err;
735 }
736 rsa=pkey->pkey.rsa;
737 EVP_PKEY_free(pkey);
738 }
739
740 tmp_buf[0]=s->client_version>>8;
741 tmp_buf[1]=s->client_version&0xff;
742 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
743 goto err;
744
745 s->session->master_key_length=sizeof tmp_buf;
746
747 q=p;
748 /* Fix buf for TLS and [incidentally] DTLS */
749 if (s->version > SSL3_VERSION)
750 p+=2;
751 n=RSA_public_encrypt(sizeof tmp_buf,
752 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
753 #ifdef PKCS1_CHECK
754 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
755 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
756 #endif
757 if (n <= 0)
758 {
759 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
760 goto err;
761 }
762
763 /* Fix buf for TLS and [incidentally] DTLS */
764 if (s->version > SSL3_VERSION)
765 {
766 s2n(n,q);
767 n+=2;
768 }
769
770 s->session->master_key_length=
771 s->method->ssl3_enc->generate_master_secret(s,
772 s->session->master_key,
773 tmp_buf,sizeof tmp_buf);
774 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
775 }
776 #endif
777 #ifndef OPENSSL_NO_KRB5
778 else if (l & SSL_kKRB5)
779 {
780 krb5_error_code krb5rc;
781 KSSL_CTX *kssl_ctx = s->kssl_ctx;
782 /* krb5_data krb5_ap_req; */
783 krb5_data *enc_ticket;
784 krb5_data authenticator, *authp = NULL;
785 EVP_CIPHER_CTX ciph_ctx;
786 EVP_CIPHER *enc = NULL;
787 unsigned char iv[EVP_MAX_IV_LENGTH];
788 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
789 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
790 + EVP_MAX_IV_LENGTH];
791 int padl, outl = sizeof(epms);
792
793 EVP_CIPHER_CTX_init(&ciph_ctx);
794
795 #ifdef KSSL_DEBUG
796 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
797 l, SSL_kKRB5);
798 #endif /* KSSL_DEBUG */
799
800 authp = NULL;
801 #ifdef KRB5SENDAUTH
802 if (KRB5SENDAUTH) authp = &authenticator;
803 #endif /* KRB5SENDAUTH */
804
805 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
806 &kssl_err);
807 enc = kssl_map_enc(kssl_ctx->enctype);
808 if (enc == NULL)
809 goto err;
810 #ifdef KSSL_DEBUG
811 {
812 printf("kssl_cget_tkt rtn %d\n", krb5rc);
813 if (krb5rc && kssl_err.text)
814 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
815 }
816 #endif /* KSSL_DEBUG */
817
818 if (krb5rc)
819 {
820 ssl3_send_alert(s,SSL3_AL_FATAL,
821 SSL_AD_HANDSHAKE_FAILURE);
822 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
823 kssl_err.reason);
824 goto err;
825 }
826
827 /* 20010406 VRS - Earlier versions used KRB5 AP_REQ
828 ** in place of RFC 2712 KerberosWrapper, as in:
829 **
830 ** Send ticket (copy to *p, set n = length)
831 ** n = krb5_ap_req.length;
832 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
833 ** if (krb5_ap_req.data)
834 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
835 **
836 ** Now using real RFC 2712 KerberosWrapper
837 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
838 ** Note: 2712 "opaque" types are here replaced
839 ** with a 2-byte length followed by the value.
840 ** Example:
841 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
842 ** Where "xx xx" = length bytes. Shown here with
843 ** optional authenticator omitted.
844 */
845
846 /* KerberosWrapper.Ticket */
847 s2n(enc_ticket->length,p);
848 memcpy(p, enc_ticket->data, enc_ticket->length);
849 p+= enc_ticket->length;
850 n = enc_ticket->length + 2;
851
852 /* KerberosWrapper.Authenticator */
853 if (authp && authp->length)
854 {
855 s2n(authp->length,p);
856 memcpy(p, authp->data, authp->length);
857 p+= authp->length;
858 n+= authp->length + 2;
859
860 free(authp->data);
861 authp->data = NULL;
862 authp->length = 0;
863 }
864 else
865 {
866 s2n(0,p);/* null authenticator length */
867 n+=2;
868 }
869
870 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
871 goto err;
872
873 /* 20010420 VRS. Tried it this way; failed.
874 ** EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
875 ** EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
876 ** kssl_ctx->length);
877 ** EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
878 */
879
880 memset(iv, 0, sizeof iv); /* per RFC 1510 */
881 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
882 kssl_ctx->key,iv);
883 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
884 sizeof tmp_buf);
885 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
886 outl += padl;
887 if (outl > sizeof epms)
888 {
889 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
890 goto err;
891 }
892 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
893
894 /* KerberosWrapper.EncryptedPreMasterSecret */
895 s2n(outl,p);
896 memcpy(p, epms, outl);
897 p+=outl;
898 n+=outl + 2;
899
900 s->session->master_key_length=
901 s->method->ssl3_enc->generate_master_secret(s,
902 s->session->master_key,
903 tmp_buf, sizeof tmp_buf);
904
905 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
906 OPENSSL_cleanse(epms, outl);
907 }
908 #endif
909 #ifndef OPENSSL_NO_DH
910 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
911 {
912 DH *dh_srvr,*dh_clnt;
913
914 if (s->session->sess_cert->peer_dh_tmp != NULL)
915 dh_srvr=s->session->sess_cert->peer_dh_tmp;
916 else
917 {
918 /* we get them from the cert */
919 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
920 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
921 goto err;
922 }
923
924 /* generate a new random key */
925 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
926 {
927 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
928 goto err;
929 }
930 if (!DH_generate_key(dh_clnt))
931 {
932 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
933 goto err;
934 }
935
936 /* use the 'p' output buffer for the DH key, but
937 * make sure to clear it out afterwards */
938
939 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
940
941 if (n <= 0)
942 {
943 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
944 goto err;
945 }
946
947 /* generate master key from the result */
948 s->session->master_key_length=
949 s->method->ssl3_enc->generate_master_secret(s,
950 s->session->master_key,p,n);
951 /* clean up */
952 memset(p,0,n);
953
954 /* send off the data */
955 n=BN_num_bytes(dh_clnt->pub_key);
956 s2n(n,p);
957 BN_bn2bin(dh_clnt->pub_key,p);
958 n+=2;
959
960 DH_free(dh_clnt);
961
962 /* perhaps clean things up a bit EAY EAY EAY EAY*/
963 }
964 #endif
965 else
966 {
967 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
968 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
969 goto err;
970 }
971
972 d = dtls1_set_message_header(s, d,
973 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
974 /*
975 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
976 l2n3(n,d);
977 l2n(s->d1->handshake_write_seq,d);
978 s->d1->handshake_write_seq++;
979 */
980
981 s->state=SSL3_ST_CW_KEY_EXCH_B;
982 /* number of bytes to write */
983 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
984 s->init_off=0;
985
986 /* buffer the message to handle re-xmits */
987 dtls1_buffer_message(s, 0);
988 }
989
990 /* SSL3_ST_CW_KEY_EXCH_B */
991 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
992 err:
993 return(-1);
994 }
995
dtls1_send_client_verify(SSL * s)996 int dtls1_send_client_verify(SSL *s)
997 {
998 unsigned char *p,*d;
999 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1000 EVP_PKEY *pkey;
1001 #ifndef OPENSSL_NO_RSA
1002 unsigned u=0;
1003 #endif
1004 unsigned long n;
1005 #ifndef OPENSSL_NO_DSA
1006 int j;
1007 #endif
1008
1009 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1010 {
1011 d=(unsigned char *)s->init_buf->data;
1012 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1013 pkey=s->cert->key->privatekey;
1014
1015 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1016 &(data[MD5_DIGEST_LENGTH]));
1017
1018 #ifndef OPENSSL_NO_RSA
1019 if (pkey->type == EVP_PKEY_RSA)
1020 {
1021 s->method->ssl3_enc->cert_verify_mac(s,
1022 &(s->s3->finish_dgst1),&(data[0]));
1023 if (RSA_sign(NID_md5_sha1, data,
1024 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1025 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1026 {
1027 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1028 goto err;
1029 }
1030 s2n(u,p);
1031 n=u+2;
1032 }
1033 else
1034 #endif
1035 #ifndef OPENSSL_NO_DSA
1036 if (pkey->type == EVP_PKEY_DSA)
1037 {
1038 if (!DSA_sign(pkey->save_type,
1039 &(data[MD5_DIGEST_LENGTH]),
1040 SHA_DIGEST_LENGTH,&(p[2]),
1041 (unsigned int *)&j,pkey->pkey.dsa))
1042 {
1043 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1044 goto err;
1045 }
1046 s2n(j,p);
1047 n=j+2;
1048 }
1049 else
1050 #endif
1051 {
1052 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1053 goto err;
1054 }
1055
1056 d = dtls1_set_message_header(s, d,
1057 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1058
1059 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1060 s->init_off=0;
1061
1062 /* buffer the message to handle re-xmits */
1063 dtls1_buffer_message(s, 0);
1064
1065 s->state = SSL3_ST_CW_CERT_VRFY_B;
1066 }
1067
1068 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1069 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1070 err:
1071 return(-1);
1072 }
1073
dtls1_send_client_certificate(SSL * s)1074 int dtls1_send_client_certificate(SSL *s)
1075 {
1076 X509 *x509=NULL;
1077 EVP_PKEY *pkey=NULL;
1078 int i;
1079 unsigned long l;
1080
1081 if (s->state == SSL3_ST_CW_CERT_A)
1082 {
1083 if ((s->cert == NULL) ||
1084 (s->cert->key->x509 == NULL) ||
1085 (s->cert->key->privatekey == NULL))
1086 s->state=SSL3_ST_CW_CERT_B;
1087 else
1088 s->state=SSL3_ST_CW_CERT_C;
1089 }
1090
1091 /* We need to get a client cert */
1092 if (s->state == SSL3_ST_CW_CERT_B)
1093 {
1094 /* If we get an error, we need to
1095 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1096 * We then get retied later */
1097 i=0;
1098 if (s->ctx->client_cert_cb != NULL)
1099 i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
1100 if (i < 0)
1101 {
1102 s->rwstate=SSL_X509_LOOKUP;
1103 return(-1);
1104 }
1105 s->rwstate=SSL_NOTHING;
1106 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1107 {
1108 s->state=SSL3_ST_CW_CERT_B;
1109 if ( !SSL_use_certificate(s,x509) ||
1110 !SSL_use_PrivateKey(s,pkey))
1111 i=0;
1112 }
1113 else if (i == 1)
1114 {
1115 i=0;
1116 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1117 }
1118
1119 if (x509 != NULL) X509_free(x509);
1120 if (pkey != NULL) EVP_PKEY_free(pkey);
1121 if (i == 0)
1122 {
1123 if (s->version == SSL3_VERSION)
1124 {
1125 s->s3->tmp.cert_req=0;
1126 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1127 return(1);
1128 }
1129 else
1130 {
1131 s->s3->tmp.cert_req=2;
1132 }
1133 }
1134
1135 /* Ok, we have a cert */
1136 s->state=SSL3_ST_CW_CERT_C;
1137 }
1138
1139 if (s->state == SSL3_ST_CW_CERT_C)
1140 {
1141 s->state=SSL3_ST_CW_CERT_D;
1142 l=dtls1_output_cert_chain(s,
1143 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1144 s->init_num=(int)l;
1145 s->init_off=0;
1146
1147 /* set header called by dtls1_output_cert_chain() */
1148
1149 /* buffer the message to handle re-xmits */
1150 dtls1_buffer_message(s, 0);
1151 }
1152 /* SSL3_ST_CW_CERT_D */
1153 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1154 }
1155
1156
1157