1 /* ssl/d1_clnt.c */
2 /*
3 * DTLS implementation written by Nagendra Modadugu
4 * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
5 */
6 /* ====================================================================
7 * Copyright (c) 1999-2007 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * openssl-core@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
60 * All rights reserved.
61 *
62 * This package is an SSL implementation written
63 * by Eric Young (eay@cryptsoft.com).
64 * The implementation was written so as to conform with Netscapes SSL.
65 *
66 * This library is free for commercial and non-commercial use as long as
67 * the following conditions are aheared to. The following conditions
68 * apply to all code found in this distribution, be it the RC4, RSA,
69 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
70 * included with this distribution is covered by the same copyright terms
71 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
72 *
73 * Copyright remains Eric Young's, and as such any Copyright notices in
74 * the code are not to be removed.
75 * If this package is used in a product, Eric Young should be given attribution
76 * as the author of the parts of the library used.
77 * This can be in the form of a textual message at program startup or
78 * in documentation (online or textual) provided with the package.
79 *
80 * Redistribution and use in source and binary forms, with or without
81 * modification, are permitted provided that the following conditions
82 * are met:
83 * 1. Redistributions of source code must retain the copyright
84 * notice, this list of conditions and the following disclaimer.
85 * 2. Redistributions in binary form must reproduce the above copyright
86 * notice, this list of conditions and the following disclaimer in the
87 * documentation and/or other materials provided with the distribution.
88 * 3. All advertising materials mentioning features or use of this software
89 * must display the following acknowledgement:
90 * "This product includes cryptographic software written by
91 * Eric Young (eay@cryptsoft.com)"
92 * The word 'cryptographic' can be left out if the rouines from the library
93 * being used are not cryptographic related :-).
94 * 4. If you include any Windows specific code (or a derivative thereof) from
95 * the apps directory (application code) you must include an acknowledgement:
96 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
97 *
98 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
99 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
100 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
101 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
102 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
103 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
104 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
105 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
106 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
107 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
108 * SUCH DAMAGE.
109 *
110 * The licence and distribution terms for any publically available version or
111 * derivative of this code cannot be changed. i.e. this code cannot simply be
112 * copied and put under another distribution licence
113 * [including the GNU Public Licence.]
114 */
115
116 #include <stdio.h>
117 #include "ssl_locl.h"
118 #ifndef OPENSSL_NO_KRB5
119 # include "kssl_lcl.h"
120 #endif
121 #include <openssl/buffer.h>
122 #include <openssl/rand.h>
123 #include <openssl/objects.h>
124 #include <openssl/evp.h>
125 #include <openssl/md5.h>
126 #include <openssl/bn.h>
127 #ifndef OPENSSL_NO_DH
128 # include <openssl/dh.h>
129 #endif
130
131 static const SSL_METHOD *dtls1_get_client_method(int ver);
132 static int dtls1_get_hello_verify(SSL *s);
133
dtls1_get_client_method(int ver)134 static const SSL_METHOD *dtls1_get_client_method(int ver)
135 {
136 if (ver == DTLS_ANY_VERSION)
137 return DTLS_client_method();
138 else if (ver == DTLS1_VERSION || ver == DTLS1_BAD_VER)
139 return DTLSv1_client_method();
140 else if (ver == DTLS1_2_VERSION)
141 return DTLSv1_2_client_method();
142 else
143 return NULL;
144 }
145
IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,DTLSv1_client_method,ssl_undefined_function,dtls1_connect,dtls1_get_client_method,DTLSv1_enc_data)146 IMPLEMENT_dtls1_meth_func(DTLS1_VERSION,
147 DTLSv1_client_method,
148 ssl_undefined_function,
149 dtls1_connect,
150 dtls1_get_client_method, DTLSv1_enc_data)
151
152 IMPLEMENT_dtls1_meth_func(DTLS1_2_VERSION,
153 DTLSv1_2_client_method,
154 ssl_undefined_function,
155 dtls1_connect,
156 dtls1_get_client_method, DTLSv1_2_enc_data)
157
158 IMPLEMENT_dtls1_meth_func(DTLS_ANY_VERSION,
159 DTLS_client_method,
160 ssl_undefined_function,
161 dtls1_connect,
162 dtls1_get_client_method, DTLSv1_2_enc_data)
163
164 int dtls1_connect(SSL *s)
165 {
166 BUF_MEM *buf = NULL;
167 unsigned long Time = (unsigned long)time(NULL);
168 void (*cb) (const SSL *ssl, int type, int val) = NULL;
169 int ret = -1;
170 int new_state, state, skip = 0;
171 #ifndef OPENSSL_NO_SCTP
172 unsigned char sctpauthkey[64];
173 char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
174 #endif
175
176 RAND_add(&Time, sizeof(Time), 0);
177 ERR_clear_error();
178 clear_sys_error();
179
180 if (s->info_callback != NULL)
181 cb = s->info_callback;
182 else if (s->ctx->info_callback != NULL)
183 cb = s->ctx->info_callback;
184
185 s->in_handshake++;
186 if (!SSL_in_init(s) || SSL_in_before(s))
187 SSL_clear(s);
188
189 #ifndef OPENSSL_NO_SCTP
190 /*
191 * Notify SCTP BIO socket to enter handshake mode and prevent stream
192 * identifier other than 0. Will be ignored if no SCTP is used.
193 */
194 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
195 s->in_handshake, NULL);
196 #endif
197
198 #ifndef OPENSSL_NO_HEARTBEATS
199 /*
200 * If we're awaiting a HeartbeatResponse, pretend we already got and
201 * don't await it anymore, because Heartbeats don't make sense during
202 * handshakes anyway.
203 */
204 if (s->tlsext_hb_pending) {
205 dtls1_stop_timer(s);
206 s->tlsext_hb_pending = 0;
207 s->tlsext_hb_seq++;
208 }
209 #endif
210
211 for (;;) {
212 state = s->state;
213
214 switch (s->state) {
215 case SSL_ST_RENEGOTIATE:
216 s->renegotiate = 1;
217 s->state = SSL_ST_CONNECT;
218 s->ctx->stats.sess_connect_renegotiate++;
219 /* break */
220 case SSL_ST_BEFORE:
221 case SSL_ST_CONNECT:
222 case SSL_ST_BEFORE | SSL_ST_CONNECT:
223 case SSL_ST_OK | SSL_ST_CONNECT:
224
225 s->server = 0;
226 if (cb != NULL)
227 cb(s, SSL_CB_HANDSHAKE_START, 1);
228
229 if ((s->version & 0xff00) != (DTLS1_VERSION & 0xff00) &&
230 (s->version & 0xff00) != (DTLS1_BAD_VER & 0xff00)) {
231 SSLerr(SSL_F_DTLS1_CONNECT, ERR_R_INTERNAL_ERROR);
232 ret = -1;
233 s->state = SSL_ST_ERR;
234 goto end;
235 }
236
237 /* s->version=SSL3_VERSION; */
238 s->type = SSL_ST_CONNECT;
239
240 if (s->init_buf == NULL) {
241 if ((buf = BUF_MEM_new()) == NULL) {
242 ret = -1;
243 s->state = SSL_ST_ERR;
244 goto end;
245 }
246 if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) {
247 ret = -1;
248 s->state = SSL_ST_ERR;
249 goto end;
250 }
251 s->init_buf = buf;
252 buf = NULL;
253 }
254
255 if (!ssl3_setup_buffers(s)) {
256 ret = -1;
257 s->state = SSL_ST_ERR;
258 goto end;
259 }
260
261 /* setup buffing BIO */
262 if (!ssl_init_wbio_buffer(s, 0)) {
263 ret = -1;
264 s->state = SSL_ST_ERR;
265 goto end;
266 }
267
268 /* don't push the buffering BIO quite yet */
269
270 s->state = SSL3_ST_CW_CLNT_HELLO_A;
271 s->ctx->stats.sess_connect++;
272 s->init_num = 0;
273 /* mark client_random uninitialized */
274 memset(s->s3->client_random, 0, sizeof(s->s3->client_random));
275 s->d1->send_cookie = 0;
276 s->hit = 0;
277 s->d1->change_cipher_spec_ok = 0;
278 /*
279 * Should have been reset by ssl3_get_finished, too.
280 */
281 s->s3->change_cipher_spec = 0;
282 break;
283
284 #ifndef OPENSSL_NO_SCTP
285 case DTLS1_SCTP_ST_CR_READ_SOCK:
286
287 if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
288 s->s3->in_read_app_data = 2;
289 s->rwstate = SSL_READING;
290 BIO_clear_retry_flags(SSL_get_rbio(s));
291 BIO_set_retry_read(SSL_get_rbio(s));
292 ret = -1;
293 goto end;
294 }
295
296 s->state = s->s3->tmp.next_state;
297 break;
298
299 case DTLS1_SCTP_ST_CW_WRITE_SOCK:
300 /* read app data until dry event */
301
302 ret = BIO_dgram_sctp_wait_for_dry(SSL_get_wbio(s));
303 if (ret < 0)
304 goto end;
305
306 if (ret == 0) {
307 s->s3->in_read_app_data = 2;
308 s->rwstate = SSL_READING;
309 BIO_clear_retry_flags(SSL_get_rbio(s));
310 BIO_set_retry_read(SSL_get_rbio(s));
311 ret = -1;
312 goto end;
313 }
314
315 s->state = s->d1->next_state;
316 break;
317 #endif
318
319 case SSL3_ST_CW_CLNT_HELLO_A:
320 s->shutdown = 0;
321
322 /* every DTLS ClientHello resets Finished MAC */
323 ssl3_init_finished_mac(s);
324
325 case SSL3_ST_CW_CLNT_HELLO_B:
326 dtls1_start_timer(s);
327 ret = ssl3_client_hello(s);
328 if (ret <= 0)
329 goto end;
330
331 if (s->d1->send_cookie) {
332 s->state = SSL3_ST_CW_FLUSH;
333 s->s3->tmp.next_state = SSL3_ST_CR_SRVR_HELLO_A;
334 } else
335 s->state = SSL3_ST_CR_SRVR_HELLO_A;
336
337 s->init_num = 0;
338
339 #ifndef OPENSSL_NO_SCTP
340 /* Disable buffering for SCTP */
341 if (!BIO_dgram_is_sctp(SSL_get_wbio(s))) {
342 #endif
343 /*
344 * turn on buffering for the next lot of output
345 */
346 if (s->bbio != s->wbio)
347 s->wbio = BIO_push(s->bbio, s->wbio);
348 #ifndef OPENSSL_NO_SCTP
349 }
350 #endif
351
352 break;
353
354 case SSL3_ST_CR_SRVR_HELLO_A:
355 case SSL3_ST_CR_SRVR_HELLO_B:
356 ret = ssl3_get_server_hello(s);
357 if (ret <= 0)
358 goto end;
359 else {
360 if (s->hit) {
361 #ifndef OPENSSL_NO_SCTP
362 /*
363 * Add new shared key for SCTP-Auth, will be ignored if
364 * no SCTP used.
365 */
366 snprintf((char *)labelbuffer,
367 sizeof(DTLS1_SCTP_AUTH_LABEL),
368 DTLS1_SCTP_AUTH_LABEL);
369
370 if (SSL_export_keying_material(s, sctpauthkey,
371 sizeof(sctpauthkey),
372 labelbuffer,
373 sizeof(labelbuffer), NULL, 0,
374 0) <= 0) {
375 ret = -1;
376 s->state = SSL_ST_ERR;
377 goto end;
378 }
379
380 BIO_ctrl(SSL_get_wbio(s),
381 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
382 sizeof(sctpauthkey), sctpauthkey);
383 #endif
384
385 s->state = SSL3_ST_CR_FINISHED_A;
386 if (s->tlsext_ticket_expected) {
387 /* receive renewed session ticket */
388 s->state = SSL3_ST_CR_SESSION_TICKET_A;
389 }
390 } else
391 s->state = DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A;
392 }
393 s->init_num = 0;
394 break;
395
396 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A:
397 case DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B:
398
399 ret = dtls1_get_hello_verify(s);
400 if (ret <= 0)
401 goto end;
402 dtls1_stop_timer(s);
403 if (s->d1->send_cookie) /* start again, with a cookie */
404 s->state = SSL3_ST_CW_CLNT_HELLO_A;
405 else
406 s->state = SSL3_ST_CR_CERT_A;
407 s->init_num = 0;
408 break;
409
410 case SSL3_ST_CR_CERT_A:
411 case SSL3_ST_CR_CERT_B:
412 /* Check if it is anon DH or PSK */
413 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
414 !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
415 ret = ssl3_get_server_certificate(s);
416 if (ret <= 0)
417 goto end;
418 #ifndef OPENSSL_NO_TLSEXT
419 if (s->tlsext_status_expected)
420 s->state = SSL3_ST_CR_CERT_STATUS_A;
421 else
422 s->state = SSL3_ST_CR_KEY_EXCH_A;
423 } else {
424 skip = 1;
425 s->state = SSL3_ST_CR_KEY_EXCH_A;
426 }
427 #else
428 } else
429 skip = 1;
430
431 s->state = SSL3_ST_CR_KEY_EXCH_A;
432 #endif
433 s->init_num = 0;
434 break;
435
436 case SSL3_ST_CR_KEY_EXCH_A:
437 case SSL3_ST_CR_KEY_EXCH_B:
438 ret = ssl3_get_key_exchange(s);
439 if (ret <= 0)
440 goto end;
441 s->state = SSL3_ST_CR_CERT_REQ_A;
442 s->init_num = 0;
443
444 /*
445 * at this point we check that we have the required stuff from
446 * the server
447 */
448 if (!ssl3_check_cert_and_algorithm(s)) {
449 ret = -1;
450 s->state = SSL_ST_ERR;
451 goto end;
452 }
453 break;
454
455 case SSL3_ST_CR_CERT_REQ_A:
456 case SSL3_ST_CR_CERT_REQ_B:
457 ret = ssl3_get_certificate_request(s);
458 if (ret <= 0)
459 goto end;
460 s->state = SSL3_ST_CR_SRVR_DONE_A;
461 s->init_num = 0;
462 break;
463
464 case SSL3_ST_CR_SRVR_DONE_A:
465 case SSL3_ST_CR_SRVR_DONE_B:
466 ret = ssl3_get_server_done(s);
467 if (ret <= 0)
468 goto end;
469 dtls1_stop_timer(s);
470 if (s->s3->tmp.cert_req)
471 s->s3->tmp.next_state = SSL3_ST_CW_CERT_A;
472 else
473 s->s3->tmp.next_state = SSL3_ST_CW_KEY_EXCH_A;
474 s->init_num = 0;
475
476 #ifndef OPENSSL_NO_SCTP
477 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
478 state == SSL_ST_RENEGOTIATE)
479 s->state = DTLS1_SCTP_ST_CR_READ_SOCK;
480 else
481 #endif
482 s->state = s->s3->tmp.next_state;
483 break;
484
485 case SSL3_ST_CW_CERT_A:
486 case SSL3_ST_CW_CERT_B:
487 case SSL3_ST_CW_CERT_C:
488 case SSL3_ST_CW_CERT_D:
489 dtls1_start_timer(s);
490 ret = ssl3_send_client_certificate(s);
491 if (ret <= 0)
492 goto end;
493 s->state = SSL3_ST_CW_KEY_EXCH_A;
494 s->init_num = 0;
495 break;
496
497 case SSL3_ST_CW_KEY_EXCH_A:
498 case SSL3_ST_CW_KEY_EXCH_B:
499 dtls1_start_timer(s);
500 ret = ssl3_send_client_key_exchange(s);
501 if (ret <= 0)
502 goto end;
503
504 #ifndef OPENSSL_NO_SCTP
505 /*
506 * Add new shared key for SCTP-Auth, will be ignored if no SCTP
507 * used.
508 */
509 snprintf((char *)labelbuffer, sizeof(DTLS1_SCTP_AUTH_LABEL),
510 DTLS1_SCTP_AUTH_LABEL);
511
512 if (SSL_export_keying_material(s, sctpauthkey,
513 sizeof(sctpauthkey), labelbuffer,
514 sizeof(labelbuffer), NULL, 0, 0) <= 0) {
515 ret = -1;
516 s->state = SSL_ST_ERR;
517 goto end;
518 }
519
520 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
521 sizeof(sctpauthkey), sctpauthkey);
522 #endif
523
524 /*
525 * EAY EAY EAY need to check for DH fix cert sent back
526 */
527 /*
528 * For TLS, cert_req is set to 2, so a cert chain of nothing is
529 * sent, but no verify packet is sent
530 */
531 if (s->s3->tmp.cert_req == 1) {
532 s->state = SSL3_ST_CW_CERT_VRFY_A;
533 } else {
534 #ifndef OPENSSL_NO_SCTP
535 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
536 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
537 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
538 } else
539 #endif
540 s->state = SSL3_ST_CW_CHANGE_A;
541 }
542
543 s->init_num = 0;
544 break;
545
546 case SSL3_ST_CW_CERT_VRFY_A:
547 case SSL3_ST_CW_CERT_VRFY_B:
548 dtls1_start_timer(s);
549 ret = ssl3_send_client_verify(s);
550 if (ret <= 0)
551 goto end;
552 #ifndef OPENSSL_NO_SCTP
553 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
554 s->d1->next_state = SSL3_ST_CW_CHANGE_A;
555 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
556 } else
557 #endif
558 s->state = SSL3_ST_CW_CHANGE_A;
559 s->init_num = 0;
560 break;
561
562 case SSL3_ST_CW_CHANGE_A:
563 case SSL3_ST_CW_CHANGE_B:
564 if (!s->hit)
565 dtls1_start_timer(s);
566 ret = dtls1_send_change_cipher_spec(s,
567 SSL3_ST_CW_CHANGE_A,
568 SSL3_ST_CW_CHANGE_B);
569 if (ret <= 0)
570 goto end;
571
572 s->state = SSL3_ST_CW_FINISHED_A;
573 s->init_num = 0;
574
575 s->session->cipher = s->s3->tmp.new_cipher;
576 #ifdef OPENSSL_NO_COMP
577 s->session->compress_meth = 0;
578 #else
579 if (s->s3->tmp.new_compression == NULL)
580 s->session->compress_meth = 0;
581 else
582 s->session->compress_meth = s->s3->tmp.new_compression->id;
583 #endif
584 if (!s->method->ssl3_enc->setup_key_block(s)) {
585 ret = -1;
586 s->state = SSL_ST_ERR;
587 goto end;
588 }
589
590 if (!s->method->ssl3_enc->change_cipher_state(s,
591 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
592 {
593 ret = -1;
594 s->state = SSL_ST_ERR;
595 goto end;
596 }
597 #ifndef OPENSSL_NO_SCTP
598 if (s->hit) {
599 /*
600 * Change to new shared key of SCTP-Auth, will be ignored if
601 * no SCTP used.
602 */
603 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
604 0, NULL);
605 }
606 #endif
607
608 dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
609 break;
610
611 case SSL3_ST_CW_FINISHED_A:
612 case SSL3_ST_CW_FINISHED_B:
613 if (!s->hit)
614 dtls1_start_timer(s);
615 ret = ssl3_send_finished(s,
616 SSL3_ST_CW_FINISHED_A,
617 SSL3_ST_CW_FINISHED_B,
618 s->method->
619 ssl3_enc->client_finished_label,
620 s->method->
621 ssl3_enc->client_finished_label_len);
622 if (ret <= 0)
623 goto end;
624 s->state = SSL3_ST_CW_FLUSH;
625
626 /* clear flags */
627 s->s3->flags &= ~SSL3_FLAGS_POP_BUFFER;
628 if (s->hit) {
629 s->s3->tmp.next_state = SSL_ST_OK;
630 #ifndef OPENSSL_NO_SCTP
631 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
632 s->d1->next_state = s->s3->tmp.next_state;
633 s->s3->tmp.next_state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
634 }
635 #endif
636 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED) {
637 s->state = SSL_ST_OK;
638 #ifndef OPENSSL_NO_SCTP
639 if (BIO_dgram_is_sctp(SSL_get_wbio(s))) {
640 s->d1->next_state = SSL_ST_OK;
641 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
642 }
643 #endif
644 s->s3->flags |= SSL3_FLAGS_POP_BUFFER;
645 s->s3->delay_buf_pop_ret = 0;
646 }
647 } else {
648 #ifndef OPENSSL_NO_SCTP
649 /*
650 * Change to new shared key of SCTP-Auth, will be ignored if
651 * no SCTP used.
652 */
653 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
654 0, NULL);
655 #endif
656
657 #ifndef OPENSSL_NO_TLSEXT
658 /*
659 * Allow NewSessionTicket if ticket expected
660 */
661 if (s->tlsext_ticket_expected)
662 s->s3->tmp.next_state = SSL3_ST_CR_SESSION_TICKET_A;
663 else
664 #endif
665
666 s->s3->tmp.next_state = SSL3_ST_CR_FINISHED_A;
667 }
668 s->init_num = 0;
669 break;
670
671 #ifndef OPENSSL_NO_TLSEXT
672 case SSL3_ST_CR_SESSION_TICKET_A:
673 case SSL3_ST_CR_SESSION_TICKET_B:
674 ret = ssl3_get_new_session_ticket(s);
675 if (ret <= 0)
676 goto end;
677 s->state = SSL3_ST_CR_FINISHED_A;
678 s->init_num = 0;
679 break;
680
681 case SSL3_ST_CR_CERT_STATUS_A:
682 case SSL3_ST_CR_CERT_STATUS_B:
683 ret = ssl3_get_cert_status(s);
684 if (ret <= 0)
685 goto end;
686 s->state = SSL3_ST_CR_KEY_EXCH_A;
687 s->init_num = 0;
688 break;
689 #endif
690
691 case SSL3_ST_CR_FINISHED_A:
692 case SSL3_ST_CR_FINISHED_B:
693 s->d1->change_cipher_spec_ok = 1;
694 ret = ssl3_get_finished(s, SSL3_ST_CR_FINISHED_A,
695 SSL3_ST_CR_FINISHED_B);
696 if (ret <= 0)
697 goto end;
698 dtls1_stop_timer(s);
699
700 if (s->hit)
701 s->state = SSL3_ST_CW_CHANGE_A;
702 else
703 s->state = SSL_ST_OK;
704
705 #ifndef OPENSSL_NO_SCTP
706 if (BIO_dgram_is_sctp(SSL_get_wbio(s)) &&
707 state == SSL_ST_RENEGOTIATE) {
708 s->d1->next_state = s->state;
709 s->state = DTLS1_SCTP_ST_CW_WRITE_SOCK;
710 }
711 #endif
712
713 s->init_num = 0;
714 break;
715
716 case SSL3_ST_CW_FLUSH:
717 s->rwstate = SSL_WRITING;
718 if (BIO_flush(s->wbio) <= 0) {
719 /*
720 * If the write error was fatal, stop trying
721 */
722 if (!BIO_should_retry(s->wbio)) {
723 s->rwstate = SSL_NOTHING;
724 s->state = s->s3->tmp.next_state;
725 }
726
727 ret = -1;
728 goto end;
729 }
730 s->rwstate = SSL_NOTHING;
731 s->state = s->s3->tmp.next_state;
732 break;
733
734 case SSL_ST_OK:
735 /* clean a few things up */
736 ssl3_cleanup_key_block(s);
737
738 #if 0
739 if (s->init_buf != NULL) {
740 BUF_MEM_free(s->init_buf);
741 s->init_buf = NULL;
742 }
743 #endif
744
745 /*
746 * If we are not 'joining' the last two packets, remove the
747 * buffering now
748 */
749 if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
750 ssl_free_wbio_buffer(s);
751 /* else do it later in ssl3_write */
752
753 s->init_num = 0;
754 s->renegotiate = 0;
755 s->new_session = 0;
756
757 ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
758 if (s->hit)
759 s->ctx->stats.sess_hit++;
760
761 ret = 1;
762 /* s->server=0; */
763 s->handshake_func = dtls1_connect;
764 s->ctx->stats.sess_connect_good++;
765
766 if (cb != NULL)
767 cb(s, SSL_CB_HANDSHAKE_DONE, 1);
768
769 /* done with handshaking */
770 s->d1->handshake_read_seq = 0;
771 s->d1->next_handshake_write_seq = 0;
772 dtls1_clear_received_buffer(s);
773 goto end;
774 /* break; */
775
776 case SSL_ST_ERR:
777 default:
778 SSLerr(SSL_F_DTLS1_CONNECT, SSL_R_UNKNOWN_STATE);
779 ret = -1;
780 goto end;
781 /* break; */
782 }
783
784 /* did we do anything */
785 if (!s->s3->tmp.reuse_message && !skip) {
786 if (s->debug) {
787 if ((ret = BIO_flush(s->wbio)) <= 0)
788 goto end;
789 }
790
791 if ((cb != NULL) && (s->state != state)) {
792 new_state = s->state;
793 s->state = state;
794 cb(s, SSL_CB_CONNECT_LOOP, 1);
795 s->state = new_state;
796 }
797 }
798 skip = 0;
799 }
800 end:
801 s->in_handshake--;
802
803 #ifndef OPENSSL_NO_SCTP
804 /*
805 * Notify SCTP BIO socket to leave handshake mode and allow stream
806 * identifier other than 0. Will be ignored if no SCTP is used.
807 */
808 BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE,
809 s->in_handshake, NULL);
810 #endif
811
812 if (buf != NULL)
813 BUF_MEM_free(buf);
814 if (cb != NULL)
815 cb(s, SSL_CB_CONNECT_EXIT, ret);
816 return (ret);
817 }
818
dtls1_get_hello_verify(SSL * s)819 static int dtls1_get_hello_verify(SSL *s)
820 {
821 int n, al, ok = 0;
822 unsigned char *data;
823 unsigned int cookie_len;
824
825 s->first_packet = 1;
826 n = s->method->ssl_get_message(s,
827 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_A,
828 DTLS1_ST_CR_HELLO_VERIFY_REQUEST_B,
829 -1, s->max_cert_list, &ok);
830 s->first_packet = 0;
831
832 if (!ok)
833 return ((int)n);
834
835 if (s->s3->tmp.message_type != DTLS1_MT_HELLO_VERIFY_REQUEST) {
836 s->d1->send_cookie = 0;
837 s->s3->tmp.reuse_message = 1;
838 return (1);
839 }
840
841 data = (unsigned char *)s->init_msg;
842 #if 0
843 if (s->method->version != DTLS_ANY_VERSION &&
844 ((data[0] != (s->version >> 8)) || (data[1] != (s->version & 0xff))))
845 {
846 SSLerr(SSL_F_DTLS1_GET_HELLO_VERIFY, SSL_R_WRONG_SSL_VERSION);
847 s->version = (s->version & 0xff00) | data[1];
848 al = SSL_AD_PROTOCOL_VERSION;
849 goto f_err;
850 }
851 #endif
852 data += 2;
853
854 cookie_len = *(data++);
855 if (cookie_len > sizeof(s->d1->cookie)) {
856 al = SSL_AD_ILLEGAL_PARAMETER;
857 goto f_err;
858 }
859
860 memcpy(s->d1->cookie, data, cookie_len);
861 s->d1->cookie_len = cookie_len;
862
863 s->d1->send_cookie = 1;
864 return 1;
865
866 f_err:
867 ssl3_send_alert(s, SSL3_AL_FATAL, al);
868 s->state = SSL_ST_ERR;
869 return -1;
870 }
871