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[thirdparty/openssl.git] / ssl / d1_clnt.c
1 /* ssl/d1_clnt.c */
2 /*
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 */
6 /* ====================================================================
7 * Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
61 *
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
65 *
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to. The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
72 *
73 * Copyright remains Eric Young's, and as such any Copyright notices in
74 * the code are not to be removed.
75 * If this package is used in a product, Eric Young should be given attribution
76 * as the author of the parts of the library used.
77 * This can be in the form of a textual message at program startup or
78 * in documentation (online or textual) provided with the package.
79 *
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
82 * are met:
83 * 1. Redistributions of source code must retain the copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * "This product includes cryptographic software written by
91 * Eric Young (eay@cryptsoft.com)"
92 * The word 'cryptographic' can be left out if the rouines from the library
93 * being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 * the apps directory (application code) you must include an acknowledgement:
96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
97 *
98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
108 * SUCH DAMAGE.
109 *
110 * The licence and distribution terms for any publically available version or
111 * derivative of this code cannot be changed. i.e. this code cannot simply be
112 * copied and put under another distribution licence
113 * [including the GNU Public Licence.]
114 */
115
116 #include <stdio.h>
117 #include "ssl_locl.h"
118 #include "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
131 static SSL_METHOD *dtls1_get_client_method(int ver)
132 {
133 if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
134 return(DTLSv1_client_method());
135 else
136 return(NULL);
137 }
138
139 IMPLEMENT_dtls1_meth_func(DTLSv1_client_method,
140 ssl_undefined_function,
141 dtls1_connect,
142 dtls1_get_client_method)
143
144 int dtls1_connect(SSL *s)
145 {
146 BUF_MEM *buf=NULL;
147 unsigned long Time=(unsigned long)time(NULL);
148 void (*cb)(const SSL *ssl,int type,int val)=NULL;
149 int ret= -1;
150 int new_state,state,skip=0;;
151
152 RAND_add(&Time,sizeof(Time),0);
153 ERR_clear_error();
154 clear_sys_error();
155
156 if (s->info_callback != NULL)
157 cb=s->info_callback;
158 else if (s->ctx->info_callback != NULL)
159 cb=s->ctx->info_callback;
160
161 s->in_handshake++;
162 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
163
164 for (;;)
165 {
166 state=s->state;
167
168 switch(s->state)
169 {
170 case SSL_ST_RENEGOTIATE:
171 s->new_session=1;
172 s->state=SSL_ST_CONNECT;
173 s->ctx->stats.sess_connect_renegotiate++;
174 /* break */
175 case SSL_ST_BEFORE:
176 case SSL_ST_CONNECT:
177 case SSL_ST_BEFORE|SSL_ST_CONNECT:
178 case SSL_ST_OK|SSL_ST_CONNECT:
179
180 s->server=0;
181 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
182
183 if ((s->version & 0xff00 ) != (DTLS1_VERSION & 0xff00) &&
184 (s->version & 0xff00 ) != (DTLS1_BAD_VER & 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 s->d1->send_cookie = 0;
223 s->hit = 0;
224 break;
225
226 case SSL3_ST_CW_CLNT_HELLO_A:
227 case SSL3_ST_CW_CLNT_HELLO_B:
228
229 s->shutdown=0;
230
231 /* every DTLS ClientHello resets Finished MAC */
232 ssl3_init_finished_mac(s);
233
234 dtls1_start_timer(s);
235 ret=dtls1_client_hello(s);
236 if (ret <= 0) goto end;
237
238 if ( s->d1->send_cookie)
239 {
240 s->state=SSL3_ST_CW_FLUSH;
241 s->s3->tmp.next_state=SSL3_ST_CR_SRVR_HELLO_A;
242 }
243 else
244 s->state=SSL3_ST_CR_SRVR_HELLO_A;
245
246 s->init_num=0;
247
248 /* turn on buffering for the next lot of output */
249 if (s->bbio != s->wbio)
250 s->wbio=BIO_push(s->bbio,s->wbio);
251
252 break;
253
254 case SSL3_ST_CR_SRVR_HELLO_A:
255 case SSL3_ST_CR_SRVR_HELLO_B:
256 ret=ssl3_get_server_hello(s);
257 if (ret <= 0) goto end;
258 else
259 {
260 if (s->hit)
261 s->state=SSL3_ST_CR_FINISHED_A;
262 else
263 s->state=DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
264 }
265 s->init_num=0;
266 break;
267
268 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
269 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
270
271 ret = dtls1_get_hello_verify(s);
272 if ( ret <= 0)
273 goto end;
274 dtls1_stop_timer(s);
275 if ( s->d1->send_cookie) /* start again, with a cookie */
276 s->state=SSL3_ST_CW_CLNT_HELLO_A;
277 else
278 s->state = SSL3_ST_CR_CERT_A;
279 s->init_num = 0;
280 break;
281
282 case SSL3_ST_CR_CERT_A:
283 case SSL3_ST_CR_CERT_B:
284 #ifndef OPENSSL_NO_TLSEXT
285 ret=ssl3_check_finished(s);
286 if (ret <= 0) goto end;
287 if (ret == 2)
288 {
289 s->hit = 1;
290 if (s->tlsext_ticket_expected)
291 s->state=SSL3_ST_CR_SESSION_TICKET_A;
292 else
293 s->state=SSL3_ST_CR_FINISHED_A;
294 s->init_num=0;
295 break;
296 }
297 #endif
298 /* Check if it is anon DH */
299 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
300 {
301 ret=ssl3_get_server_certificate(s);
302 if (ret <= 0) goto end;
303 #ifndef OPENSSL_NO_TLSEXT
304 if (s->tlsext_status_expected)
305 s->state=SSL3_ST_CR_CERT_STATUS_A;
306 else
307 s->state=SSL3_ST_CR_KEY_EXCH_A;
308 }
309 else
310 {
311 skip = 1;
312 s->state=SSL3_ST_CR_KEY_EXCH_A;
313 }
314 #else
315 }
316 else
317 skip=1;
318
319 s->state=SSL3_ST_CR_KEY_EXCH_A;
320 #endif
321 s->init_num=0;
322 break;
323
324 case SSL3_ST_CR_KEY_EXCH_A:
325 case SSL3_ST_CR_KEY_EXCH_B:
326 ret=ssl3_get_key_exchange(s);
327 if (ret <= 0) goto end;
328 s->state=SSL3_ST_CR_CERT_REQ_A;
329 s->init_num=0;
330
331 /* at this point we check that we have the
332 * required stuff from the server */
333 if (!ssl3_check_cert_and_algorithm(s))
334 {
335 ret= -1;
336 goto end;
337 }
338 break;
339
340 case SSL3_ST_CR_CERT_REQ_A:
341 case SSL3_ST_CR_CERT_REQ_B:
342 ret=ssl3_get_certificate_request(s);
343 if (ret <= 0) goto end;
344 s->state=SSL3_ST_CR_SRVR_DONE_A;
345 s->init_num=0;
346 break;
347
348 case SSL3_ST_CR_SRVR_DONE_A:
349 case SSL3_ST_CR_SRVR_DONE_B:
350 ret=ssl3_get_server_done(s);
351 if (ret <= 0) goto end;
352 dtls1_stop_timer(s);
353 if (s->s3->tmp.cert_req)
354 s->state=SSL3_ST_CW_CERT_A;
355 else
356 s->state=SSL3_ST_CW_KEY_EXCH_A;
357 s->init_num=0;
358
359 break;
360
361 case SSL3_ST_CW_CERT_A:
362 case SSL3_ST_CW_CERT_B:
363 case SSL3_ST_CW_CERT_C:
364 case SSL3_ST_CW_CERT_D:
365 dtls1_start_timer(s);
366 ret=dtls1_send_client_certificate(s);
367 if (ret <= 0) goto end;
368 s->state=SSL3_ST_CW_KEY_EXCH_A;
369 s->init_num=0;
370 break;
371
372 case SSL3_ST_CW_KEY_EXCH_A:
373 case SSL3_ST_CW_KEY_EXCH_B:
374 dtls1_start_timer(s);
375 ret=dtls1_send_client_key_exchange(s);
376 if (ret <= 0) goto end;
377 /* EAY EAY EAY need to check for DH fix cert
378 * sent back */
379 /* For TLS, cert_req is set to 2, so a cert chain
380 * of nothing is sent, but no verify packet is sent */
381 if (s->s3->tmp.cert_req == 1)
382 {
383 s->state=SSL3_ST_CW_CERT_VRFY_A;
384 }
385 else
386 {
387 s->state=SSL3_ST_CW_CHANGE_A;
388 s->s3->change_cipher_spec=0;
389 }
390
391 s->init_num=0;
392 break;
393
394 case SSL3_ST_CW_CERT_VRFY_A:
395 case SSL3_ST_CW_CERT_VRFY_B:
396 dtls1_start_timer(s);
397 ret=dtls1_send_client_verify(s);
398 if (ret <= 0) goto end;
399 s->state=SSL3_ST_CW_CHANGE_A;
400 s->init_num=0;
401 s->s3->change_cipher_spec=0;
402 break;
403
404 case SSL3_ST_CW_CHANGE_A:
405 case SSL3_ST_CW_CHANGE_B:
406 if (!s->hit)
407 dtls1_start_timer(s);
408 ret=dtls1_send_change_cipher_spec(s,
409 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
410 if (ret <= 0) goto end;
411 s->state=SSL3_ST_CW_FINISHED_A;
412 s->init_num=0;
413
414 s->session->cipher=s->s3->tmp.new_cipher;
415 #ifdef OPENSSL_NO_COMP
416 s->session->compress_meth=0;
417 #else
418 if (s->s3->tmp.new_compression == NULL)
419 s->session->compress_meth=0;
420 else
421 s->session->compress_meth=
422 s->s3->tmp.new_compression->id;
423 #endif
424 if (!s->method->ssl3_enc->setup_key_block(s))
425 {
426 ret= -1;
427 goto end;
428 }
429
430 if (!s->method->ssl3_enc->change_cipher_state(s,
431 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
432 {
433 ret= -1;
434 goto end;
435 }
436
437 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
438 break;
439
440 case SSL3_ST_CW_FINISHED_A:
441 case SSL3_ST_CW_FINISHED_B:
442 if (!s->hit)
443 dtls1_start_timer(s);
444 ret=dtls1_send_finished(s,
445 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
446 s->method->ssl3_enc->client_finished_label,
447 s->method->ssl3_enc->client_finished_label_len);
448 if (ret <= 0) goto end;
449 s->state=SSL3_ST_CW_FLUSH;
450
451 /* clear flags */
452 s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
453 if (s->hit)
454 {
455 s->s3->tmp.next_state=SSL_ST_OK;
456 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
457 {
458 s->state=SSL_ST_OK;
459 s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
460 s->s3->delay_buf_pop_ret=0;
461 }
462 }
463 else
464 {
465 #ifndef OPENSSL_NO_TLSEXT
466 /* Allow NewSessionTicket if ticket expected */
467 if (s->tlsext_ticket_expected)
468 s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
469 else
470 #endif
471
472 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
473 }
474 s->init_num=0;
475
476 break;
477
478 #ifndef OPENSSL_NO_TLSEXT
479 case SSL3_ST_CR_SESSION_TICKET_A:
480 case SSL3_ST_CR_SESSION_TICKET_B:
481 ret=ssl3_get_new_session_ticket(s);
482 if (ret <= 0) goto end;
483 s->state=SSL3_ST_CR_FINISHED_A;
484 s->init_num=0;
485 break;
486
487 case SSL3_ST_CR_CERT_STATUS_A:
488 case SSL3_ST_CR_CERT_STATUS_B:
489 ret=ssl3_get_cert_status(s);
490 if (ret <= 0) goto end;
491 s->state=SSL3_ST_CR_KEY_EXCH_A;
492 s->init_num=0;
493 break;
494 #endif
495
496 case SSL3_ST_CR_FINISHED_A:
497 case SSL3_ST_CR_FINISHED_B:
498 s->d1->change_cipher_spec_ok = 1;
499 ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
500 SSL3_ST_CR_FINISHED_B);
501 if (ret <= 0) goto end;
502 dtls1_stop_timer(s);
503
504 if (s->hit)
505 s->state=SSL3_ST_CW_CHANGE_A;
506 else
507 s->state=SSL_ST_OK;
508 s->init_num=0;
509 break;
510
511 case SSL3_ST_CW_FLUSH:
512 s->rwstate=SSL_WRITING;
513 if (BIO_flush(s->wbio) <= 0)
514 {
515 ret= -1;
516 goto end;
517 }
518 s->rwstate=SSL_NOTHING;
519 s->state=s->s3->tmp.next_state;
520 break;
521
522 case SSL_ST_OK:
523 /* clean a few things up */
524 ssl3_cleanup_key_block(s);
525
526 #if 0
527 if (s->init_buf != NULL)
528 {
529 BUF_MEM_free(s->init_buf);
530 s->init_buf=NULL;
531 }
532 #endif
533
534 /* If we are not 'joining' the last two packets,
535 * remove the buffering now */
536 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
537 ssl_free_wbio_buffer(s);
538 /* else do it later in ssl3_write */
539
540 s->init_num=0;
541 s->new_session=0;
542
543 ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
544 if (s->hit) s->ctx->stats.sess_hit++;
545
546 ret=1;
547 /* s->server=0; */
548 s->handshake_func=dtls1_connect;
549 s->ctx->stats.sess_connect_good++;
550
551 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
552
553 /* done with handshaking */
554 s->d1->handshake_read_seq = 0;
555 s->d1->next_handshake_write_seq = 0;
556 goto end;
557 /* break; */
558
559 default:
560 SSLerr(SSL_F_DTLS1_CONNECT,SSL_R_UNKNOWN_STATE);
561 ret= -1;
562 goto end;
563 /* break; */
564 }
565
566 /* did we do anything */
567 if (!s->s3->tmp.reuse_message && !skip)
568 {
569 if (s->debug)
570 {
571 if ((ret=BIO_flush(s->wbio)) <= 0)
572 goto end;
573 }
574
575 if ((cb != NULL) && (s->state != state))
576 {
577 new_state=s->state;
578 s->state=state;
579 cb(s,SSL_CB_CONNECT_LOOP,1);
580 s->state=new_state;
581 }
582 }
583 skip=0;
584 }
585 end:
586 s->in_handshake--;
587 if (buf != NULL)
588 BUF_MEM_free(buf);
589 if (cb != NULL)
590 cb(s,SSL_CB_CONNECT_EXIT,ret);
591 return(ret);
592 }
593
594 int dtls1_client_hello(SSL *s)
595 {
596 unsigned char *buf;
597 unsigned char *p,*d;
598 unsigned int i,j;
599 unsigned long Time,l;
600 SSL_COMP *comp;
601
602 buf=(unsigned char *)s->init_buf->data;
603 if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
604 {
605 SSL_SESSION *sess = s->session;
606 if ((s->session == NULL) ||
607 (s->session->ssl_version != s->version) ||
608 #ifdef OPENSSL_NO_TLSEXT
609 !sess->session_id_length ||
610 #else
611 (!sess->session_id_length && !sess->tlsext_tick) ||
612 #endif
613 (s->session->not_resumable))
614 {
615 if (!ssl_get_new_session(s,0))
616 goto err;
617 }
618 /* else use the pre-loaded session */
619
620 p=s->s3->client_random;
621 /* if client_random is initialized, reuse it, we are
622 * required to use same upon reply to HelloVerify */
623 for (i=0;p[i]=='\0' && i<sizeof(s->s3->client_random);i++) ;
624 if (i==sizeof(s->s3->client_random))
625 {
626 Time=(unsigned long)time(NULL); /* Time */
627 l2n(Time,p);
628 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
629 }
630
631 /* Do the message type and length last */
632 d=p= &(buf[DTLS1_HM_HEADER_LENGTH]);
633
634 *(p++)=s->version>>8;
635 *(p++)=s->version&0xff;
636 s->client_version=s->version;
637
638 /* Random stuff */
639 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
640 p+=SSL3_RANDOM_SIZE;
641
642 /* Session ID */
643 if (s->new_session)
644 i=0;
645 else
646 i=s->session->session_id_length;
647 *(p++)=i;
648 if (i != 0)
649 {
650 if (i > sizeof s->session->session_id)
651 {
652 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
653 goto err;
654 }
655 memcpy(p,s->session->session_id,i);
656 p+=i;
657 }
658
659 /* cookie stuff */
660 if ( s->d1->cookie_len > sizeof(s->d1->cookie))
661 {
662 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
663 goto err;
664 }
665 *(p++) = s->d1->cookie_len;
666 memcpy(p, s->d1->cookie, s->d1->cookie_len);
667 p += s->d1->cookie_len;
668
669 /* Ciphers supported */
670 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
671 if (i == 0)
672 {
673 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
674 goto err;
675 }
676 s2n(i,p);
677 p+=i;
678
679 /* COMPRESSION */
680 if (s->ctx->comp_methods == NULL)
681 j=0;
682 else
683 j=sk_SSL_COMP_num(s->ctx->comp_methods);
684 *(p++)=1+j;
685 for (i=0; i<j; i++)
686 {
687 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
688 *(p++)=comp->id;
689 }
690 *(p++)=0; /* Add the NULL method */
691
692 #ifndef OPENSSL_NO_TLSEXT
693 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
694 {
695 SSLerr(SSL_F_DTLS1_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
696 goto err;
697 }
698 #endif
699
700 l=(p-d);
701 d=buf;
702
703 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
704
705 s->state=SSL3_ST_CW_CLNT_HELLO_B;
706 /* number of bytes to write */
707 s->init_num=p-buf;
708 s->init_off=0;
709
710 /* buffer the message to handle re-xmits */
711 dtls1_buffer_message(s, 0);
712 }
713
714 /* SSL3_ST_CW_CLNT_HELLO_B */
715 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
716 err:
717 return(-1);
718 }
719
720 static int dtls1_get_hello_verify(SSL *s)
721 {
722 int n, al, ok = 0;
723 unsigned char *data;
724 unsigned int cookie_len;
725
726 n=s->method->ssl_get_message(s,
727 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
728 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
729 -1,
730 s->max_cert_list,
731 &ok);
732
733 if (!ok) return((int)n);
734
735 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST)
736 {
737 s->d1->send_cookie = 0;
738 s->s3->tmp.reuse_message=1;
739 return(1);
740 }
741
742 data = (unsigned char *)s->init_msg;
743
744 if ((data[0] != (s->version>>8)) || (data[1] != (s->version&0xff)))
745 {
746 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY,SSL_R_WRONG_SSL_VERSION);
747 s->version=(s->version&0xff00)|data[1];
748 al = SSL_AD_PROTOCOL_VERSION;
749 goto f_err;
750 }
751 data+=2;
752
753 cookie_len = *(data++);
754 if ( cookie_len > sizeof(s->d1->cookie))
755 {
756 al=SSL_AD_ILLEGAL_PARAMETER;
757 goto f_err;
758 }
759
760 memcpy(s->d1->cookie, data, cookie_len);
761 s->d1->cookie_len = cookie_len;
762
763 s->d1->send_cookie = 1;
764 return 1;
765
766 f_err:
767 ssl3_send_alert(s, SSL3_AL_FATAL, al);
768 return -1;
769 }
770
771 int dtls1_send_client_key_exchange(SSL *s)
772 {
773 unsigned char *p,*d;
774 int n;
775 unsigned long l;
776 #ifndef OPENSSL_NO_RSA
777 unsigned char *q;
778 EVP_PKEY *pkey=NULL;
779 #endif
780 #ifndef OPENSSL_NO_KRB5
781 KSSL_ERR kssl_err;
782 #endif /* OPENSSL_NO_KRB5 */
783
784 if (s->state == SSL3_ST_CW_KEY_EXCH_A)
785 {
786 d=(unsigned char *)s->init_buf->data;
787 p= &(d[DTLS1_HM_HEADER_LENGTH]);
788
789 l=s->s3->tmp.new_cipher->algorithms;
790
791 /* Fool emacs indentation */
792 if (0) {}
793 #ifndef OPENSSL_NO_RSA
794 else if (l & SSL_kRSA)
795 {
796 RSA *rsa;
797 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
798
799 if (s->session->sess_cert == NULL)
800 {
801 /* We should always have a server certificate with SSL_kRSA. */
802 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
803 goto err;
804 }
805
806 if (s->session->sess_cert->peer_rsa_tmp != NULL)
807 rsa=s->session->sess_cert->peer_rsa_tmp;
808 else
809 {
810 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
811 if ((pkey == NULL) ||
812 (pkey->type != EVP_PKEY_RSA) ||
813 (pkey->pkey.rsa == NULL))
814 {
815 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
816 goto err;
817 }
818 rsa=pkey->pkey.rsa;
819 EVP_PKEY_free(pkey);
820 }
821
822 tmp_buf[0]=s->client_version>>8;
823 tmp_buf[1]=s->client_version&0xff;
824 if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
825 goto err;
826
827 s->session->master_key_length=sizeof tmp_buf;
828
829 q=p;
830 /* Fix buf for TLS and [incidentally] DTLS */
831 if (s->version > SSL3_VERSION)
832 p+=2;
833 n=RSA_public_encrypt(sizeof tmp_buf,
834 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
835 #ifdef PKCS1_CHECK
836 if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
837 if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
838 #endif
839 if (n <= 0)
840 {
841 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
842 goto err;
843 }
844
845 /* Fix buf for TLS and [incidentally] DTLS */
846 if (s->version > SSL3_VERSION)
847 {
848 s2n(n,q);
849 n+=2;
850 }
851
852 s->session->master_key_length=
853 s->method->ssl3_enc->generate_master_secret(s,
854 s->session->master_key,
855 tmp_buf,sizeof tmp_buf);
856 OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
857 }
858 #endif
859 #ifndef OPENSSL_NO_KRB5
860 else if (l & SSL_kKRB5)
861 {
862 krb5_error_code krb5rc;
863 KSSL_CTX *kssl_ctx = s->kssl_ctx;
864 /* krb5_data krb5_ap_req; */
865 krb5_data *enc_ticket;
866 krb5_data authenticator, *authp = NULL;
867 EVP_CIPHER_CTX ciph_ctx;
868 EVP_CIPHER *enc = NULL;
869 unsigned char iv[EVP_MAX_IV_LENGTH];
870 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
871 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH
872 + EVP_MAX_IV_LENGTH];
873 int padl, outl = sizeof(epms);
874
875 EVP_CIPHER_CTX_init(&ciph_ctx);
876
877 #ifdef KSSL_DEBUG
878 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
879 l, SSL_kKRB5);
880 #endif /* KSSL_DEBUG */
881
882 authp = NULL;
883 #ifdef KRB5SENDAUTH
884 if (KRB5SENDAUTH) authp = &authenticator;
885 #endif /* KRB5SENDAUTH */
886
887 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
888 &kssl_err);
889 enc = kssl_map_enc(kssl_ctx->enctype);
890 if (enc == NULL)
891 goto err;
892 #ifdef KSSL_DEBUG
893 {
894 printf("kssl_cget_tkt rtn %d\n", krb5rc);
895 if (krb5rc && kssl_err.text)
896 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
897 }
898 #endif /* KSSL_DEBUG */
899
900 if (krb5rc)
901 {
902 ssl3_send_alert(s,SSL3_AL_FATAL,
903 SSL_AD_HANDSHAKE_FAILURE);
904 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
905 kssl_err.reason);
906 goto err;
907 }
908
909 /*-
910 * 20010406 VRS - Earlier versions used KRB5 AP_REQ
911 ** in place of RFC 2712 KerberosWrapper, as in:
912 **
913 ** Send ticket (copy to *p, set n = length)
914 ** n = krb5_ap_req.length;
915 ** memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
916 ** if (krb5_ap_req.data)
917 ** kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
918 **
919 ** Now using real RFC 2712 KerberosWrapper
920 ** (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
921 ** Note: 2712 "opaque" types are here replaced
922 ** with a 2-byte length followed by the value.
923 ** Example:
924 ** KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
925 ** Where "xx xx" = length bytes. Shown here with
926 ** optional authenticator omitted.
927 */
928
929 /* KerberosWrapper.Ticket */
930 s2n(enc_ticket->length,p);
931 memcpy(p, enc_ticket->data, enc_ticket->length);
932 p+= enc_ticket->length;
933 n = enc_ticket->length + 2;
934
935 /* KerberosWrapper.Authenticator */
936 if (authp && authp->length)
937 {
938 s2n(authp->length,p);
939 memcpy(p, authp->data, authp->length);
940 p+= authp->length;
941 n+= authp->length + 2;
942
943 free(authp->data);
944 authp->data = NULL;
945 authp->length = 0;
946 }
947 else
948 {
949 s2n(0,p);/* null authenticator length */
950 n+=2;
951 }
952
953 if (RAND_bytes(tmp_buf,sizeof tmp_buf) <= 0)
954 goto err;
955
956 /*-
957 * 20010420 VRS. Tried it this way; failed.
958 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
959 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
960 * kssl_ctx->length);
961 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
962 */
963
964 memset(iv, 0, sizeof iv); /* per RFC 1510 */
965 EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
966 kssl_ctx->key,iv);
967 EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
968 sizeof tmp_buf);
969 EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
970 outl += padl;
971 if (outl > sizeof epms)
972 {
973 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
974 goto err;
975 }
976 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
977
978 /* KerberosWrapper.EncryptedPreMasterSecret */
979 s2n(outl,p);
980 memcpy(p, epms, outl);
981 p+=outl;
982 n+=outl + 2;
983
984 s->session->master_key_length=
985 s->method->ssl3_enc->generate_master_secret(s,
986 s->session->master_key,
987 tmp_buf, sizeof tmp_buf);
988
989 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
990 OPENSSL_cleanse(epms, outl);
991 }
992 #endif
993 #ifndef OPENSSL_NO_DH
994 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
995 {
996 DH *dh_srvr,*dh_clnt;
997
998 if (s->session->sess_cert == NULL)
999 {
1000 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1001 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1002 goto err;
1003 }
1004
1005 if (s->session->sess_cert->peer_dh_tmp != NULL)
1006 dh_srvr=s->session->sess_cert->peer_dh_tmp;
1007 else
1008 {
1009 /* we get them from the cert */
1010 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1011 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1012 goto err;
1013 }
1014
1015 /* generate a new random key */
1016 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
1017 {
1018 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1019 goto err;
1020 }
1021 if (!DH_generate_key(dh_clnt))
1022 {
1023 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1024 goto err;
1025 }
1026
1027 /* use the 'p' output buffer for the DH key, but
1028 * make sure to clear it out afterwards */
1029
1030 n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
1031
1032 if (n <= 0)
1033 {
1034 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1035 goto err;
1036 }
1037
1038 /* generate master key from the result */
1039 s->session->master_key_length=
1040 s->method->ssl3_enc->generate_master_secret(s,
1041 s->session->master_key,p,n);
1042 /* clean up */
1043 memset(p,0,n);
1044
1045 /* send off the data */
1046 n=BN_num_bytes(dh_clnt->pub_key);
1047 s2n(n,p);
1048 BN_bn2bin(dh_clnt->pub_key,p);
1049 n+=2;
1050
1051 DH_free(dh_clnt);
1052
1053 /* perhaps clean things up a bit EAY EAY EAY EAY*/
1054 }
1055 #endif
1056 else
1057 {
1058 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
1059 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1060 goto err;
1061 }
1062
1063 d = dtls1_set_message_header(s, d,
1064 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1065 /*-
1066 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1067 l2n3(n,d);
1068 l2n(s->d1->handshake_write_seq,d);
1069 s->d1->handshake_write_seq++;
1070 */
1071
1072 s->state=SSL3_ST_CW_KEY_EXCH_B;
1073 /* number of bytes to write */
1074 s->init_num=n+DTLS1_HM_HEADER_LENGTH;
1075 s->init_off=0;
1076
1077 /* buffer the message to handle re-xmits */
1078 dtls1_buffer_message(s, 0);
1079 }
1080
1081 /* SSL3_ST_CW_KEY_EXCH_B */
1082 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1083 err:
1084 return(-1);
1085 }
1086
1087 int dtls1_send_client_verify(SSL *s)
1088 {
1089 unsigned char *p,*d;
1090 unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1091 EVP_PKEY *pkey;
1092 #ifndef OPENSSL_NO_RSA
1093 unsigned u=0;
1094 #endif
1095 unsigned long n;
1096 #ifndef OPENSSL_NO_DSA
1097 int j;
1098 #endif
1099
1100 if (s->state == SSL3_ST_CW_CERT_VRFY_A)
1101 {
1102 d=(unsigned char *)s->init_buf->data;
1103 p= &(d[DTLS1_HM_HEADER_LENGTH]);
1104 pkey=s->cert->key->privatekey;
1105
1106 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
1107 &(data[MD5_DIGEST_LENGTH]));
1108
1109 #ifndef OPENSSL_NO_RSA
1110 if (pkey->type == EVP_PKEY_RSA)
1111 {
1112 s->method->ssl3_enc->cert_verify_mac(s,
1113 &(s->s3->finish_dgst1),&(data[0]));
1114 if (RSA_sign(NID_md5_sha1, data,
1115 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
1116 &(p[2]), &u, pkey->pkey.rsa) <= 0 )
1117 {
1118 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
1119 goto err;
1120 }
1121 s2n(u,p);
1122 n=u+2;
1123 }
1124 else
1125 #endif
1126 #ifndef OPENSSL_NO_DSA
1127 if (pkey->type == EVP_PKEY_DSA)
1128 {
1129 if (!DSA_sign(pkey->save_type,
1130 &(data[MD5_DIGEST_LENGTH]),
1131 SHA_DIGEST_LENGTH,&(p[2]),
1132 (unsigned int *)&j,pkey->pkey.dsa))
1133 {
1134 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
1135 goto err;
1136 }
1137 s2n(j,p);
1138 n=j+2;
1139 }
1140 else
1141 #endif
1142 {
1143 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
1144 goto err;
1145 }
1146
1147 d = dtls1_set_message_header(s, d,
1148 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n) ;
1149
1150 s->init_num=(int)n+DTLS1_HM_HEADER_LENGTH;
1151 s->init_off=0;
1152
1153 /* buffer the message to handle re-xmits */
1154 dtls1_buffer_message(s, 0);
1155
1156 s->state = SSL3_ST_CW_CERT_VRFY_B;
1157 }
1158
1159 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1160 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1161 err:
1162 return(-1);
1163 }
1164
1165 int dtls1_send_client_certificate(SSL *s)
1166 {
1167 X509 *x509=NULL;
1168 EVP_PKEY *pkey=NULL;
1169 int i;
1170 unsigned long l;
1171
1172 if (s->state == SSL3_ST_CW_CERT_A)
1173 {
1174 if ((s->cert == NULL) ||
1175 (s->cert->key->x509 == NULL) ||
1176 (s->cert->key->privatekey == NULL))
1177 s->state=SSL3_ST_CW_CERT_B;
1178 else
1179 s->state=SSL3_ST_CW_CERT_C;
1180 }
1181
1182 /* We need to get a client cert */
1183 if (s->state == SSL3_ST_CW_CERT_B)
1184 {
1185 /* If we get an error, we need to
1186 * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
1187 * We then get retied later */
1188 i=0;
1189 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1190 if (i < 0)
1191 {
1192 s->rwstate=SSL_X509_LOOKUP;
1193 return(-1);
1194 }
1195 s->rwstate=SSL_NOTHING;
1196 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
1197 {
1198 s->state=SSL3_ST_CW_CERT_B;
1199 if ( !SSL_use_certificate(s,x509) ||
1200 !SSL_use_PrivateKey(s,pkey))
1201 i=0;
1202 }
1203 else if (i == 1)
1204 {
1205 i=0;
1206 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1207 }
1208
1209 if (x509 != NULL) X509_free(x509);
1210 if (pkey != NULL) EVP_PKEY_free(pkey);
1211 if (i == 0)
1212 {
1213 if (s->version == SSL3_VERSION)
1214 {
1215 s->s3->tmp.cert_req=0;
1216 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
1217 return(1);
1218 }
1219 else
1220 {
1221 s->s3->tmp.cert_req=2;
1222 }
1223 }
1224
1225 /* Ok, we have a cert */
1226 s->state=SSL3_ST_CW_CERT_C;
1227 }
1228
1229 if (s->state == SSL3_ST_CW_CERT_C)
1230 {
1231 s->state=SSL3_ST_CW_CERT_D;
1232 l=dtls1_output_cert_chain(s,
1233 (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
1234 s->init_num=(int)l;
1235 s->init_off=0;
1236
1237 /* set header called by dtls1_output_cert_chain() */
1238
1239 /* buffer the message to handle re-xmits */
1240 dtls1_buffer_message(s, 0);
1241 }
1242 /* SSL3_ST_CW_CERT_D */
1243 return(dtls1_do_write(s,SSL3_RT_HANDSHAKE));
1244 }
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