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 || ver == DTLS1_BAD_VER)
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, dtls1_get_client_method)
142
143 int dtls1_connect(SSL *s)
144 {
145 BUF_MEM *buf = NULL;
146 unsigned long Time = (unsigned long)time(NULL);
147 void (*cb) (const SSL *ssl, int type, int val) = NULL;
148 int ret = -1;
149 int new_state, state, skip = 0;;
150
151 RAND_add(&Time, sizeof(Time), 0);
152 ERR_clear_error();
153 clear_sys_error();
154
155 if (s->info_callback != NULL)
156 cb = s->info_callback;
157 else if (s->ctx->info_callback != NULL)
158 cb = s->ctx->info_callback;
159
160 s->in_handshake++;
161 if (!SSL_in_init(s) || SSL_in_before(s))
162 SSL_clear(s);
163
164 for (;;) {
165 state = s->state;
166
167 switch (s->state) {
168 case SSL_ST_RENEGOTIATE:
169 s->new_session = 1;
170 s->state = SSL_ST_CONNECT;
171 s->ctx->stats.sess_connect_renegotiate++;
172 /* break */
173 case SSL_ST_BEFORE:
174 case SSL_ST_CONNECT:
175 case SSL_ST_BEFORE | SSL_ST_CONNECT:
176 case SSL_ST_OK | SSL_ST_CONNECT:
177
178 s->server = 0;
179 if (cb != NULL)
180 cb(s, SSL_CB_HANDSHAKE_START, 1);
181
182 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
183 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
184 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
185 ret = -1;
186 goto end;
187 }
188
189 /* s->version=SSL3_VERSION; */
190 s->type = SSL_ST_CONNECT;
191
192 if (s->init_buf == NULL) {
193 if ((buf = BUF_MEM_new()) == NULL) {
194 ret = -1;
195 goto end;
196 }
197 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
198 ret = -1;
199 goto end;
200 }
201 s->init_buf = buf;
202 buf = NULL;
203 }
204
205 if (!ssl3_setup_buffers(s)) {
206 ret = -1;
207 goto end;
208 }
209
210 /* setup buffing BIO */
211 if (!ssl_init_wbio_buffer(s, 0)) {
212 ret = -1;
213 goto end;
214 }
215
216 /* don't push the buffering BIO quite yet */
217
218 s->state = SSL3_ST_CW_CLNT_HELLO_A;
219 s->ctx->stats.sess_connect++;
220 s->init_num = 0;
221 /* mark client_random uninitialized */
222 memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
223 s->d1->send_cookie = 0;
224 s->hit = 0;
225 break;
226
227 case SSL3_ST_CW_CLNT_HELLO_A:
228 case SSL3_ST_CW_CLNT_HELLO_B:
229
230 s->shutdown = 0;
231
232 /* every DTLS ClientHello resets Finished MAC */
233 ssl3_init_finished_mac(s);
234
235 dtls1_start_timer(s);
236 ret = dtls1_client_hello(s);
237 if (ret <= 0)
238 goto end;
239
240 if (s->d1->send_cookie) {
241 s->state = SSL3_ST_CW_FLUSH;
242 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
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)
258 goto end;
259 else {
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)
287 goto end;
288 if (ret == 2) {
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 ret = ssl3_get_server_certificate(s);
301 if (ret <= 0)
302 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 } else {
309 skip = 1;
310 s->state = SSL3_ST_CR_KEY_EXCH_A;
311 }
312 #else
313 } else
314 skip = 1;
315
316 s->state = SSL3_ST_CR_KEY_EXCH_A;
317 #endif
318 s->init_num = 0;
319 break;
320
321 case SSL3_ST_CR_KEY_EXCH_A:
322 case SSL3_ST_CR_KEY_EXCH_B:
323 ret = ssl3_get_key_exchange(s);
324 if (ret <= 0)
325 goto end;
326 s->state = SSL3_ST_CR_CERT_REQ_A;
327 s->init_num = 0;
328
329 /*
330 * at this point we check that we have the required stuff from
331 * the server
332 */
333 if (!ssl3_check_cert_and_algorithm(s)) {
334 ret = -1;
335 goto end;
336 }
337 break;
338
339 case SSL3_ST_CR_CERT_REQ_A:
340 case SSL3_ST_CR_CERT_REQ_B:
341 ret = ssl3_get_certificate_request(s);
342 if (ret <= 0)
343 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)
352 goto end;
353 dtls1_stop_timer(s);
354 if (s->s3->tmp.cert_req)
355 s->state = SSL3_ST_CW_CERT_A;
356 else
357 s->state = SSL3_ST_CW_KEY_EXCH_A;
358 s->init_num = 0;
359
360 break;
361
362 case SSL3_ST_CW_CERT_A:
363 case SSL3_ST_CW_CERT_B:
364 case SSL3_ST_CW_CERT_C:
365 case SSL3_ST_CW_CERT_D:
366 dtls1_start_timer(s);
367 ret = dtls1_send_client_certificate(s);
368 if (ret <= 0)
369 goto end;
370 s->state = SSL3_ST_CW_KEY_EXCH_A;
371 s->init_num = 0;
372 break;
373
374 case SSL3_ST_CW_KEY_EXCH_A:
375 case SSL3_ST_CW_KEY_EXCH_B:
376 dtls1_start_timer(s);
377 ret = dtls1_send_client_key_exchange(s);
378 if (ret <= 0)
379 goto end;
380 /*
381 * EAY EAY EAY need to check for DH fix cert sent back
382 */
383 /*
384 * For TLS, cert_req is set to 2, so a cert chain of nothing is
385 * sent, but no verify packet is sent
386 */
387 if (s->s3->tmp.cert_req == 1) {
388 s->state = SSL3_ST_CW_CERT_VRFY_A;
389 } else {
390 s->state = SSL3_ST_CW_CHANGE_A;
391 s->s3->change_cipher_spec = 0;
392 }
393
394 s->init_num = 0;
395 break;
396
397 case SSL3_ST_CW_CERT_VRFY_A:
398 case SSL3_ST_CW_CERT_VRFY_B:
399 dtls1_start_timer(s);
400 ret = dtls1_send_client_verify(s);
401 if (ret <= 0)
402 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,
414 SSL3_ST_CW_CHANGE_B);
415 if (ret <= 0)
416 goto end;
417 s->state = SSL3_ST_CW_FINISHED_A;
418 s->init_num = 0;
419
420 s->session->cipher = s->s3->tmp.new_cipher;
421 #ifdef OPENSSL_NO_COMP
422 s->session->compress_meth = 0;
423 #else
424 if (s->s3->tmp.new_compression == NULL)
425 s->session->compress_meth = 0;
426 else
427 s->session->compress_meth = s->s3->tmp.new_compression->id;
428 #endif
429 if (!s->method->ssl3_enc->setup_key_block(s)) {
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,
450 SSL3_ST_CW_FINISHED_B,
451 s->method->
452 ssl3_enc->client_finished_label,
453 s->method->
454 ssl3_enc->client_finished_label_len);
455 if (ret <= 0)
456 goto end;
457 s->state = SSL3_ST_CW_FLUSH;
458
459 /* clear flags */
460 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
461 if (s->hit) {
462 s->s3->tmp.next_state = SSL_ST_OK;
463 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
464 s->state = SSL_ST_OK;
465 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
466 s->s3->delay_buf_pop_ret = 0;
467 }
468 } else {
469 #ifndef OPENSSL_NO_TLSEXT
470 /*
471 * Allow NewSessionTicket if ticket expected
472 */
473 if (s->tlsext_ticket_expected)
474 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
475 else
476 #endif
477
478 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
479 }
480 s->init_num = 0;
481
482 break;
483
484 #ifndef OPENSSL_NO_TLSEXT
485 case SSL3_ST_CR_SESSION_TICKET_A:
486 case SSL3_ST_CR_SESSION_TICKET_B:
487 ret = ssl3_get_new_session_ticket(s);
488 if (ret <= 0)
489 goto end;
490 s->state = SSL3_ST_CR_FINISHED_A;
491 s->init_num = 0;
492 break;
493
494 case SSL3_ST_CR_CERT_STATUS_A:
495 case SSL3_ST_CR_CERT_STATUS_B:
496 ret = ssl3_get_cert_status(s);
497 if (ret <= 0)
498 goto end;
499 s->state = SSL3_ST_CR_KEY_EXCH_A;
500 s->init_num = 0;
501 break;
502 #endif
503
504 case SSL3_ST_CR_FINISHED_A:
505 case SSL3_ST_CR_FINISHED_B:
506 s->d1->change_cipher_spec_ok = 1;
507 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
508 SSL3_ST_CR_FINISHED_B);
509 if (ret <= 0)
510 goto end;
511 dtls1_stop_timer(s);
512
513 if (s->hit)
514 s->state = SSL3_ST_CW_CHANGE_A;
515 else
516 s->state = SSL_ST_OK;
517 s->init_num = 0;
518 break;
519
520 case SSL3_ST_CW_FLUSH:
521 s->rwstate = SSL_WRITING;
522 if (BIO_flush(s->wbio) <= 0) {
523 ret = -1;
524 goto end;
525 }
526 s->rwstate = SSL_NOTHING;
527 s->state = s->s3->tmp.next_state;
528 break;
529
530 case SSL_ST_OK:
531 /* clean a few things up */
532 ssl3_cleanup_key_block(s);
533
534 #if 0
535 if (s->init_buf != NULL) {
536 BUF_MEM_free(s->init_buf);
537 s->init_buf = NULL;
538 }
539 #endif
540
541 /*
542 * If we are not 'joining' the last two packets, remove the
543 * buffering now
544 */
545 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
546 ssl_free_wbio_buffer(s);
547 /* else do it later in ssl3_write */
548
549 s->init_num = 0;
550 s->new_session = 0;
551
552 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
553 if (s->hit)
554 s->ctx->stats.sess_hit++;
555
556 ret = 1;
557 /* s->server=0; */
558 s->handshake_func = dtls1_connect;
559 s->ctx->stats.sess_connect_good++;
560
561 if (cb != NULL)
562 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
563
564 /* done with handshaking */
565 s->d1->handshake_read_seq = 0;
566 s->d1->next_handshake_write_seq = 0;
567 dtls1_clear_received_buffer(s);
568 goto end;
569 /* break; */
570
571 default:
572 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
573 ret = -1;
574 goto end;
575 /* break; */
576 }
577
578 /* did we do anything */
579 if (!s->s3->tmp.reuse_message && !skip) {
580 if (s->debug) {
581 if ((ret = BIO_flush(s->wbio)) <= 0)
582 goto end;
583 }
584
585 if ((cb != NULL) && (s->state != state)) {
586 new_state = s->state;
587 s->state = state;
588 cb(s, SSL_CB_CONNECT_LOOP, 1);
589 s->state = new_state;
590 }
591 }
592 skip = 0;
593 }
594 end:
595 s->in_handshake--;
596 if (buf != NULL)
597 BUF_MEM_free(buf);
598 if (cb != NULL)
599 cb(s, SSL_CB_CONNECT_EXIT, ret);
600 return (ret);
601 }
602
dtls1_client_hello(SSL * s)603 int dtls1_client_hello(SSL *s)
604 {
605 unsigned char *buf;
606 unsigned char *p, *d;
607 unsigned int i, j;
608 unsigned long Time, l;
609 SSL_COMP *comp;
610
611 buf = (unsigned char *)s->init_buf->data;
612 if (s->state == SSL3_ST_CW_CLNT_HELLO_A) {
613 SSL_SESSION *sess = s->session;
614 if ((s->session == NULL) || (s->session->ssl_version != s->version) ||
615 #ifdef OPENSSL_NO_TLSEXT
616 !sess->session_id_length ||
617 #else
618 (!sess->session_id_length && !sess->tlsext_tick) ||
619 #endif
620 (s->session->not_resumable)) {
621 if (!ssl_get_new_session(s, 0))
622 goto err;
623 }
624 /* else use the pre-loaded session */
625
626 p = s->s3->client_random;
627 /*
628 * if client_random is initialized, reuse it, we are required to use
629 * same upon reply to HelloVerify
630 */
631 for (i = 0; p[i] == '\0' && i < sizeof(s->s3->client_random); i++) ;
632 if (i == sizeof(s->s3->client_random)) {
633 Time = (unsigned long)time(NULL); /* Time */
634 l2n(Time, p);
635 RAND_pseudo_bytes(p, SSL3_RANDOM_SIZE - 4);
636 }
637
638 /* Do the message type and length last */
639 d = p = &(buf[DTLS1_HM_HEADER_LENGTH]);
640
641 *(p++) = s->version >> 8;
642 *(p++) = s->version & 0xff;
643 s->client_version = s->version;
644
645 /* Random stuff */
646 memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
647 p += SSL3_RANDOM_SIZE;
648
649 /* Session ID */
650 if (s->new_session)
651 i = 0;
652 else
653 i = s->session->session_id_length;
654 *(p++) = i;
655 if (i != 0) {
656 if (i > sizeof s->session->session_id) {
657 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
658 goto err;
659 }
660 memcpy(p, s->session->session_id, i);
661 p += i;
662 }
663
664 /* cookie stuff */
665 if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
666 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
667 goto err;
668 }
669 *(p++) = s->d1->cookie_len;
670 memcpy(p, s->d1->cookie, s->d1->cookie_len);
671 p += s->d1->cookie_len;
672
673 /* Ciphers supported */
674 i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]), 0);
675 if (i == 0) {
676 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
677 goto err;
678 }
679 s2n(i, p);
680 p += i;
681
682 /* COMPRESSION */
683 if (s->ctx->comp_methods == NULL)
684 j = 0;
685 else
686 j = sk_SSL_COMP_num(s->ctx->comp_methods);
687 *(p++) = 1 + j;
688 for (i = 0; i < j; i++) {
689 comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
690 *(p++) = comp->id;
691 }
692 *(p++) = 0; /* Add the NULL method */
693
694 #ifndef OPENSSL_NO_TLSEXT
695 if ((p =
696 ssl_add_clienthello_tlsext(s, p,
697 buf + SSL3_RT_MAX_PLAIN_LENGTH)) ==
698 NULL) {
699 SSLerr(SSL_F_DTLS1_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
700 goto err;
701 }
702 #endif
703
704 l = (p - d);
705 d = buf;
706
707 d = dtls1_set_message_header(s, d, SSL3_MT_CLIENT_HELLO, l, 0, l);
708
709 s->state = SSL3_ST_CW_CLNT_HELLO_B;
710 /* number of bytes to write */
711 s->init_num = p - buf;
712 s->init_off = 0;
713
714 /* buffer the message to handle re-xmits */
715 dtls1_buffer_message(s, 0);
716 }
717
718 /* SSL3_ST_CW_CLNT_HELLO_B */
719 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
720 err:
721 return (-1);
722 }
723
dtls1_get_hello_verify(SSL * s)724 static int dtls1_get_hello_verify(SSL *s)
725 {
726 int n, al, ok = 0;
727 unsigned char *data;
728 unsigned int cookie_len;
729
730 n = s->method->ssl_get_message(s,
731 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
732 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
733 -1, s->max_cert_list, &ok);
734
735 if (!ok)
736 return ((int)n);
737
738 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
739 s->d1->send_cookie = 0;
740 s->s3->tmp.reuse_message = 1;
741 return (1);
742 }
743
744 data = (unsigned char *)s->init_msg;
745
746 if ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))) {
747 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
748 s->version = (s->version & 0xff00) | data[1];
749 al = SSL_AD_PROTOCOL_VERSION;
750 goto f_err;
751 }
752 data += 2;
753
754 cookie_len = *(data++);
755 if (cookie_len > sizeof(s->d1->cookie)) {
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
dtls1_send_client_key_exchange(SSL * s)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 d = (unsigned char *)s->init_buf->data;
786 p = &(d[DTLS1_HM_HEADER_LENGTH]);
787
788 l = s->s3->tmp.new_cipher->algorithms;
789
790 /* Fool emacs indentation */
791 if (0) {
792 }
793 #ifndef OPENSSL_NO_RSA
794 else if (l & SSL_kRSA) {
795 RSA *rsa;
796 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
797
798 if (s->session->sess_cert == NULL) {
799 /*
800 * We should always have a server certificate with SSL_kRSA.
801 */
802 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
803 ERR_R_INTERNAL_ERROR);
804 goto err;
805 }
806
807 if (s->session->sess_cert->peer_rsa_tmp != NULL)
808 rsa = s->session->sess_cert->peer_rsa_tmp;
809 else {
810 pkey =
811 X509_get_pubkey(s->session->
812 sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].
813 x509);
814 if ((pkey == NULL) || (pkey->type != EVP_PKEY_RSA)
815 || (pkey->pkey.rsa == NULL)) {
816 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
817 ERR_R_INTERNAL_ERROR);
818 goto err;
819 }
820 rsa = pkey->pkey.rsa;
821 EVP_PKEY_free(pkey);
822 }
823
824 tmp_buf[0] = s->client_version >> 8;
825 tmp_buf[1] = s->client_version & 0xff;
826 if (RAND_bytes(&(tmp_buf[2]), sizeof tmp_buf - 2) <= 0)
827 goto err;
828
829 s->session->master_key_length = sizeof tmp_buf;
830
831 q = p;
832 /* Fix buf for TLS and [incidentally] DTLS */
833 if (s->version > SSL3_VERSION)
834 p += 2;
835 n = RSA_public_encrypt(sizeof tmp_buf,
836 tmp_buf, p, rsa, RSA_PKCS1_PADDING);
837 # ifdef PKCS1_CHECK
838 if (s->options & SSL_OP_PKCS1_CHECK_1)
839 p[1]++;
840 if (s->options & SSL_OP_PKCS1_CHECK_2)
841 tmp_buf[0] = 0x70;
842 # endif
843 if (n <= 0) {
844 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
845 SSL_R_BAD_RSA_ENCRYPT);
846 goto err;
847 }
848
849 /* Fix buf for TLS and [incidentally] DTLS */
850 if (s->version > SSL3_VERSION) {
851 s2n(n, q);
852 n += 2;
853 }
854
855 s->session->master_key_length =
856 s->method->ssl3_enc->generate_master_secret(s,
857 s->
858 session->master_key,
859 tmp_buf,
860 sizeof tmp_buf);
861 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
862 }
863 #endif
864 #ifndef OPENSSL_NO_KRB5
865 else if (l & SSL_kKRB5) {
866 krb5_error_code krb5rc;
867 KSSL_CTX *kssl_ctx = s->kssl_ctx;
868 /* krb5_data krb5_ap_req; */
869 krb5_data *enc_ticket;
870 krb5_data authenticator, *authp = NULL;
871 EVP_CIPHER_CTX ciph_ctx;
872 EVP_CIPHER *enc = NULL;
873 unsigned char iv[EVP_MAX_IV_LENGTH];
874 unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
875 unsigned char epms[SSL_MAX_MASTER_KEY_LENGTH + EVP_MAX_IV_LENGTH];
876 int padl, outl = sizeof(epms);
877
878 EVP_CIPHER_CTX_init(&ciph_ctx);
879
880 # ifdef KSSL_DEBUG
881 printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
882 l, SSL_kKRB5);
883 # endif /* KSSL_DEBUG */
884
885 authp = NULL;
886 # ifdef KRB5SENDAUTH
887 if (KRB5SENDAUTH)
888 authp = &authenticator;
889 # endif /* KRB5SENDAUTH */
890
891 krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp, &kssl_err);
892 enc = kssl_map_enc(kssl_ctx->enctype);
893 if (enc == NULL)
894 goto err;
895 # ifdef KSSL_DEBUG
896 {
897 printf("kssl_cget_tkt rtn %d\n", krb5rc);
898 if (krb5rc && kssl_err.text)
899 printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
900 }
901 # endif /* KSSL_DEBUG */
902
903 if (krb5rc) {
904 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
905 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, 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 s2n(authp->length, p);
938 memcpy(p, authp->data, authp->length);
939 p += authp->length;
940 n += authp->length + 2;
941
942 free(authp->data);
943 authp->data = NULL;
944 authp->length = 0;
945 } else {
946 s2n(0, p); /* null authenticator length */
947 n += 2;
948 }
949
950 if (RAND_bytes(tmp_buf, sizeof tmp_buf) <= 0)
951 goto err;
952
953 /*-
954 * 20010420 VRS. Tried it this way; failed.
955 * EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
956 * EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
957 * kssl_ctx->length);
958 * EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
959 */
960
961 memset(iv, 0, sizeof iv); /* per RFC 1510 */
962 EVP_EncryptInit_ex(&ciph_ctx, enc, NULL, kssl_ctx->key, iv);
963 EVP_EncryptUpdate(&ciph_ctx, epms, &outl, tmp_buf,
964 sizeof tmp_buf);
965 EVP_EncryptFinal_ex(&ciph_ctx, &(epms[outl]), &padl);
966 outl += padl;
967 if (outl > sizeof epms) {
968 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
969 ERR_R_INTERNAL_ERROR);
970 goto err;
971 }
972 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
973
974 /* KerberosWrapper.EncryptedPreMasterSecret */
975 s2n(outl, p);
976 memcpy(p, epms, outl);
977 p += outl;
978 n += outl + 2;
979
980 s->session->master_key_length =
981 s->method->ssl3_enc->generate_master_secret(s,
982 s->
983 session->master_key,
984 tmp_buf,
985 sizeof tmp_buf);
986
987 OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
988 OPENSSL_cleanse(epms, outl);
989 }
990 #endif
991 #ifndef OPENSSL_NO_DH
992 else if (l & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) {
993 DH *dh_srvr, *dh_clnt;
994
995 if (s->session->sess_cert == NULL) {
996 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
997 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
998 SSL_R_UNEXPECTED_MESSAGE);
999 goto err;
1000 }
1001
1002 if (s->session->sess_cert->peer_dh_tmp != NULL)
1003 dh_srvr = s->session->sess_cert->peer_dh_tmp;
1004 else {
1005 /* we get them from the cert */
1006 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1007 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1008 SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
1009 goto err;
1010 }
1011
1012 /* generate a new random key */
1013 if ((dh_clnt = DHparams_dup(dh_srvr)) == NULL) {
1014 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1015 goto err;
1016 }
1017 if (!DH_generate_key(dh_clnt)) {
1018 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1019 goto err;
1020 }
1021
1022 /*
1023 * use the 'p' output buffer for the DH key, but make sure to
1024 * clear it out afterwards
1025 */
1026
1027 n = DH_compute_key(p, dh_srvr->pub_key, dh_clnt);
1028
1029 if (n <= 0) {
1030 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE, ERR_R_DH_LIB);
1031 goto err;
1032 }
1033
1034 /* generate master key from the result */
1035 s->session->master_key_length =
1036 s->method->ssl3_enc->generate_master_secret(s,
1037 s->
1038 session->master_key,
1039 p, n);
1040 /* clean up */
1041 memset(p, 0, n);
1042
1043 /* send off the data */
1044 n = BN_num_bytes(dh_clnt->pub_key);
1045 s2n(n, p);
1046 BN_bn2bin(dh_clnt->pub_key, p);
1047 n += 2;
1048
1049 DH_free(dh_clnt);
1050
1051 /* perhaps clean things up a bit EAY EAY EAY EAY */
1052 }
1053 #endif
1054 else {
1055 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
1056 SSLerr(SSL_F_DTLS1_SEND_CLIENT_KEY_EXCHANGE,
1057 ERR_R_INTERNAL_ERROR);
1058 goto err;
1059 }
1060
1061 d = dtls1_set_message_header(s, d,
1062 SSL3_MT_CLIENT_KEY_EXCHANGE, n, 0, n);
1063 /*-
1064 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
1065 l2n3(n,d);
1066 l2n(s->d1->handshake_write_seq,d);
1067 s->d1->handshake_write_seq++;
1068 */
1069
1070 s->state = SSL3_ST_CW_KEY_EXCH_B;
1071 /* number of bytes to write */
1072 s->init_num = n + DTLS1_HM_HEADER_LENGTH;
1073 s->init_off = 0;
1074
1075 /* buffer the message to handle re-xmits */
1076 dtls1_buffer_message(s, 0);
1077 }
1078
1079 /* SSL3_ST_CW_KEY_EXCH_B */
1080 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1081 err:
1082 return (-1);
1083 }
1084
dtls1_send_client_verify(SSL * s)1085 int dtls1_send_client_verify(SSL *s)
1086 {
1087 unsigned char *p, *d;
1088 unsigned char data[MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH];
1089 EVP_PKEY *pkey;
1090 #ifndef OPENSSL_NO_RSA
1091 unsigned u = 0;
1092 #endif
1093 unsigned long n;
1094 #ifndef OPENSSL_NO_DSA
1095 int j;
1096 #endif
1097
1098 if (s->state == SSL3_ST_CW_CERT_VRFY_A) {
1099 d = (unsigned char *)s->init_buf->data;
1100 p = &(d[DTLS1_HM_HEADER_LENGTH]);
1101 pkey = s->cert->key->privatekey;
1102
1103 s->method->ssl3_enc->cert_verify_mac(s, &(s->s3->finish_dgst2),
1104 &(data[MD5_DIGEST_LENGTH]));
1105
1106 #ifndef OPENSSL_NO_RSA
1107 if (pkey->type == EVP_PKEY_RSA) {
1108 s->method->ssl3_enc->cert_verify_mac(s,
1109 &(s->s3->finish_dgst1),
1110 &(data[0]));
1111 if (RSA_sign
1112 (NID_md5_sha1, data, MD5_DIGEST_LENGTH + SHA_DIGEST_LENGTH,
1113 &(p[2]), &u, pkey->pkey.rsa) <= 0) {
1114 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_RSA_LIB);
1115 goto err;
1116 }
1117 s2n(u, p);
1118 n = u + 2;
1119 } else
1120 #endif
1121 #ifndef OPENSSL_NO_DSA
1122 if (pkey->type == EVP_PKEY_DSA) {
1123 if (!DSA_sign(pkey->save_type,
1124 &(data[MD5_DIGEST_LENGTH]),
1125 SHA_DIGEST_LENGTH, &(p[2]),
1126 (unsigned int *)&j, pkey->pkey.dsa)) {
1127 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_DSA_LIB);
1128 goto err;
1129 }
1130 s2n(j, p);
1131 n = j + 2;
1132 } else
1133 #endif
1134 {
1135 SSLerr(SSL_F_DTLS1_SEND_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
1136 goto err;
1137 }
1138
1139 d = dtls1_set_message_header(s, d,
1140 SSL3_MT_CERTIFICATE_VERIFY, n, 0, n);
1141
1142 s->init_num = (int)n + DTLS1_HM_HEADER_LENGTH;
1143 s->init_off = 0;
1144
1145 /* buffer the message to handle re-xmits */
1146 dtls1_buffer_message(s, 0);
1147
1148 s->state = SSL3_ST_CW_CERT_VRFY_B;
1149 }
1150
1151 /* s->state = SSL3_ST_CW_CERT_VRFY_B */
1152 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1153 err:
1154 return (-1);
1155 }
1156
dtls1_send_client_certificate(SSL * s)1157 int dtls1_send_client_certificate(SSL *s)
1158 {
1159 X509 *x509 = NULL;
1160 EVP_PKEY *pkey = NULL;
1161 int i;
1162 unsigned long l;
1163
1164 if (s->state == SSL3_ST_CW_CERT_A) {
1165 if ((s->cert == NULL) ||
1166 (s->cert->key->x509 == NULL) ||
1167 (s->cert->key->privatekey == NULL))
1168 s->state = SSL3_ST_CW_CERT_B;
1169 else
1170 s->state = SSL3_ST_CW_CERT_C;
1171 }
1172
1173 /* We need to get a client cert */
1174 if (s->state == SSL3_ST_CW_CERT_B) {
1175 /*
1176 * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
1177 * return(-1); We then get retied later
1178 */
1179 i = 0;
1180 i = ssl_do_client_cert_cb(s, &x509, &pkey);
1181 if (i < 0) {
1182 s->rwstate = SSL_X509_LOOKUP;
1183 return (-1);
1184 }
1185 s->rwstate = SSL_NOTHING;
1186 if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
1187 s->state = SSL3_ST_CW_CERT_B;
1188 if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
1189 i = 0;
1190 } else if (i == 1) {
1191 i = 0;
1192 SSLerr(SSL_F_DTLS1_SEND_CLIENT_CERTIFICATE,
1193 SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
1194 }
1195
1196 if (x509 != NULL)
1197 X509_free(x509);
1198 if (pkey != NULL)
1199 EVP_PKEY_free(pkey);
1200 if (i == 0) {
1201 if (s->version == SSL3_VERSION) {
1202 s->s3->tmp.cert_req = 0;
1203 ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
1204 return (1);
1205 } else {
1206 s->s3->tmp.cert_req = 2;
1207 }
1208 }
1209
1210 /* Ok, we have a cert */
1211 s->state = SSL3_ST_CW_CERT_C;
1212 }
1213
1214 if (s->state == SSL3_ST_CW_CERT_C) {
1215 s->state = SSL3_ST_CW_CERT_D;
1216 l = dtls1_output_cert_chain(s,
1217 (s->s3->tmp.cert_req ==
1218 2) ? NULL : s->cert->key->x509);
1219 s->init_num = (int)l;
1220 s->init_off = 0;
1221
1222 /* set header called by dtls1_output_cert_chain() */
1223
1224 /* buffer the message to handle re-xmits */
1225 dtls1_buffer_message(s, 0);
1226 }
1227 /* SSL3_ST_CW_CERT_D */
1228 return (dtls1_do_write(s, SSL3_RT_HANDSHAKE));
1229 }
1230