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-rw-r--r--src/lib/libssl/d1_lib.c474
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diff --git a/src/lib/libssl/d1_lib.c b/src/lib/libssl/d1_lib.c
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1/* $OpenBSD: d1_lib.c,v 1.29 2015/07/19 20:32:18 doug Exp $ */
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
60#include <sys/types.h>
61#include <sys/socket.h>
62
63#include <netinet/in.h>
64
65#include <stdio.h>
66
67#include <openssl/objects.h>
68
69#include "pqueue.h"
70#include "ssl_locl.h"
71
72int dtls1_listen(SSL *s, struct sockaddr *client);
73
74SSL3_ENC_METHOD DTLSv1_enc_data = {
75 .enc = dtls1_enc,
76 .mac = tls1_mac,
77 .setup_key_block = tls1_setup_key_block,
78 .generate_master_secret = tls1_generate_master_secret,
79 .change_cipher_state = tls1_change_cipher_state,
80 .final_finish_mac = tls1_final_finish_mac,
81 .finish_mac_length = TLS1_FINISH_MAC_LENGTH,
82 .cert_verify_mac = tls1_cert_verify_mac,
83 .client_finished_label = TLS_MD_CLIENT_FINISH_CONST,
84 .client_finished_label_len = TLS_MD_CLIENT_FINISH_CONST_SIZE,
85 .server_finished_label = TLS_MD_SERVER_FINISH_CONST,
86 .server_finished_label_len = TLS_MD_SERVER_FINISH_CONST_SIZE,
87 .alert_value = tls1_alert_code,
88 .export_keying_material = tls1_export_keying_material,
89 .enc_flags = SSL_ENC_FLAG_DTLS|SSL_ENC_FLAG_EXPLICIT_IV,
90};
91
92long
93dtls1_default_timeout(void)
94{
95 /* 2 hours, the 24 hours mentioned in the DTLSv1 spec
96 * is way too long for http, the cache would over fill */
97 return (60*60*2);
98}
99
100int
101dtls1_new(SSL *s)
102{
103 DTLS1_STATE *d1;
104
105 if (!ssl3_new(s))
106 return (0);
107 if ((d1 = calloc(1, sizeof *d1)) == NULL) {
108 ssl3_free(s);
109 return (0);
110 }
111
112 /* d1->handshake_epoch=0; */
113
114 d1->unprocessed_rcds.q = pqueue_new();
115 d1->processed_rcds.q = pqueue_new();
116 d1->buffered_messages = pqueue_new();
117 d1->sent_messages = pqueue_new();
118 d1->buffered_app_data.q = pqueue_new();
119
120 if (s->server) {
121 d1->cookie_len = sizeof(s->d1->cookie);
122 }
123
124 if (!d1->unprocessed_rcds.q || !d1->processed_rcds.q ||
125 !d1->buffered_messages || !d1->sent_messages ||
126 !d1->buffered_app_data.q) {
127 if (d1->unprocessed_rcds.q)
128 pqueue_free(d1->unprocessed_rcds.q);
129 if (d1->processed_rcds.q)
130 pqueue_free(d1->processed_rcds.q);
131 if (d1->buffered_messages)
132 pqueue_free(d1->buffered_messages);
133 if (d1->sent_messages)
134 pqueue_free(d1->sent_messages);
135 if (d1->buffered_app_data.q)
136 pqueue_free(d1->buffered_app_data.q);
137 free(d1);
138 ssl3_free(s);
139 return (0);
140 }
141
142 s->d1 = d1;
143 s->method->ssl_clear(s);
144 return (1);
145}
146
147static void
148dtls1_clear_queues(SSL *s)
149{
150 pitem *item = NULL;
151 hm_fragment *frag = NULL;
152 DTLS1_RECORD_DATA *rdata;
153
154 while ((item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL) {
155 rdata = (DTLS1_RECORD_DATA *) item->data;
156 free(rdata->rbuf.buf);
157 free(item->data);
158 pitem_free(item);
159 }
160
161 while ((item = pqueue_pop(s->d1->processed_rcds.q)) != NULL) {
162 rdata = (DTLS1_RECORD_DATA *) item->data;
163 free(rdata->rbuf.buf);
164 free(item->data);
165 pitem_free(item);
166 }
167
168 while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) {
169 frag = (hm_fragment *)item->data;
170 free(frag->fragment);
171 free(frag);
172 pitem_free(item);
173 }
174
175 while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) {
176 frag = (hm_fragment *)item->data;
177 free(frag->fragment);
178 free(frag);
179 pitem_free(item);
180 }
181
182 while ((item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL) {
183 rdata = (DTLS1_RECORD_DATA *) item->data;
184 free(rdata->rbuf.buf);
185 free(item->data);
186 pitem_free(item);
187 }
188}
189
190void
191dtls1_free(SSL *s)
192{
193 if (s == NULL)
194 return;
195
196 ssl3_free(s);
197
198 dtls1_clear_queues(s);
199
200 pqueue_free(s->d1->unprocessed_rcds.q);
201 pqueue_free(s->d1->processed_rcds.q);
202 pqueue_free(s->d1->buffered_messages);
203 pqueue_free(s->d1->sent_messages);
204 pqueue_free(s->d1->buffered_app_data.q);
205
206 OPENSSL_cleanse(s->d1, sizeof *s->d1);
207 free(s->d1);
208 s->d1 = NULL;
209}
210
211void
212dtls1_clear(SSL *s)
213{
214 pqueue unprocessed_rcds;
215 pqueue processed_rcds;
216 pqueue buffered_messages;
217 pqueue sent_messages;
218 pqueue buffered_app_data;
219 unsigned int mtu;
220
221 if (s->d1) {
222 unprocessed_rcds = s->d1->unprocessed_rcds.q;
223 processed_rcds = s->d1->processed_rcds.q;
224 buffered_messages = s->d1->buffered_messages;
225 sent_messages = s->d1->sent_messages;
226 buffered_app_data = s->d1->buffered_app_data.q;
227 mtu = s->d1->mtu;
228
229 dtls1_clear_queues(s);
230
231 memset(s->d1, 0, sizeof(*(s->d1)));
232
233 if (s->server) {
234 s->d1->cookie_len = sizeof(s->d1->cookie);
235 }
236
237 if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
238 s->d1->mtu = mtu;
239 }
240
241 s->d1->unprocessed_rcds.q = unprocessed_rcds;
242 s->d1->processed_rcds.q = processed_rcds;
243 s->d1->buffered_messages = buffered_messages;
244 s->d1->sent_messages = sent_messages;
245 s->d1->buffered_app_data.q = buffered_app_data;
246 }
247
248 ssl3_clear(s);
249 if (s->options & SSL_OP_CISCO_ANYCONNECT)
250 s->version = DTLS1_BAD_VER;
251 else
252 s->version = DTLS1_VERSION;
253}
254
255long
256dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
257{
258 int ret = 0;
259
260 switch (cmd) {
261 case DTLS_CTRL_GET_TIMEOUT:
262 if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL) {
263 ret = 1;
264 }
265 break;
266 case DTLS_CTRL_HANDLE_TIMEOUT:
267 ret = dtls1_handle_timeout(s);
268 break;
269 case DTLS_CTRL_LISTEN:
270 ret = dtls1_listen(s, parg);
271 break;
272
273 default:
274 ret = ssl3_ctrl(s, cmd, larg, parg);
275 break;
276 }
277 return (ret);
278}
279
280/*
281 * As it's impossible to use stream ciphers in "datagram" mode, this
282 * simple filter is designed to disengage them in DTLS. Unfortunately
283 * there is no universal way to identify stream SSL_CIPHER, so we have
284 * to explicitly list their SSL_* codes. Currently RC4 is the only one
285 * available, but if new ones emerge, they will have to be added...
286 */
287const SSL_CIPHER *
288dtls1_get_cipher(unsigned int u)
289{
290 const SSL_CIPHER *ciph = ssl3_get_cipher(u);
291
292 if (ciph != NULL) {
293 if (ciph->algorithm_enc == SSL_RC4)
294 return NULL;
295 }
296
297 return ciph;
298}
299
300void
301dtls1_start_timer(SSL *s)
302{
303
304 /* If timer is not set, initialize duration with 1 second */
305 if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
306 s->d1->timeout_duration = 1;
307 }
308
309 /* Set timeout to current time */
310 gettimeofday(&(s->d1->next_timeout), NULL);
311
312 /* Add duration to current time */
313 s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
314 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
315 &(s->d1->next_timeout));
316}
317
318struct timeval*
319dtls1_get_timeout(SSL *s, struct timeval* timeleft)
320{
321 struct timeval timenow;
322
323 /* If no timeout is set, just return NULL */
324 if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
325 return NULL;
326 }
327
328 /* Get current time */
329 gettimeofday(&timenow, NULL);
330
331 /* If timer already expired, set remaining time to 0 */
332 if (s->d1->next_timeout.tv_sec < timenow.tv_sec ||
333 (s->d1->next_timeout.tv_sec == timenow.tv_sec &&
334 s->d1->next_timeout.tv_usec <= timenow.tv_usec)) {
335 memset(timeleft, 0, sizeof(struct timeval));
336 return timeleft;
337 }
338
339 /* Calculate time left until timer expires */
340 memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval));
341 timeleft->tv_sec -= timenow.tv_sec;
342 timeleft->tv_usec -= timenow.tv_usec;
343 if (timeleft->tv_usec < 0) {
344 timeleft->tv_sec--;
345 timeleft->tv_usec += 1000000;
346 }
347
348 /* If remaining time is less than 15 ms, set it to 0
349 * to prevent issues because of small devergences with
350 * socket timeouts.
351 */
352 if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) {
353 memset(timeleft, 0, sizeof(struct timeval));
354 }
355
356
357 return timeleft;
358}
359
360int
361dtls1_is_timer_expired(SSL *s)
362{
363 struct timeval timeleft;
364
365 /* Get time left until timeout, return false if no timer running */
366 if (dtls1_get_timeout(s, &timeleft) == NULL) {
367 return 0;
368 }
369
370 /* Return false if timer is not expired yet */
371 if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) {
372 return 0;
373 }
374
375 /* Timer expired, so return true */
376 return 1;
377}
378
379void
380dtls1_double_timeout(SSL *s)
381{
382 s->d1->timeout_duration *= 2;
383 if (s->d1->timeout_duration > 60)
384 s->d1->timeout_duration = 60;
385 dtls1_start_timer(s);
386}
387
388void
389dtls1_stop_timer(SSL *s)
390{
391 /* Reset everything */
392 memset(&(s->d1->timeout), 0, sizeof(struct dtls1_timeout_st));
393 memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
394 s->d1->timeout_duration = 1;
395 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
396 &(s->d1->next_timeout));
397 /* Clear retransmission buffer */
398 dtls1_clear_record_buffer(s);
399}
400
401int
402dtls1_check_timeout_num(SSL *s)
403{
404 s->d1->timeout.num_alerts++;
405
406 /* Reduce MTU after 2 unsuccessful retransmissions */
407 if (s->d1->timeout.num_alerts > 2) {
408 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
409 BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
410
411 }
412
413 if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
414 /* fail the connection, enough alerts have been sent */
415 SSLerr(SSL_F_DTLS1_CHECK_TIMEOUT_NUM, SSL_R_READ_TIMEOUT_EXPIRED);
416 return -1;
417 }
418
419 return 0;
420}
421
422int
423dtls1_handle_timeout(SSL *s)
424{
425 /* if no timer is expired, don't do anything */
426 if (!dtls1_is_timer_expired(s)) {
427 return 0;
428 }
429
430 dtls1_double_timeout(s);
431
432 if (dtls1_check_timeout_num(s) < 0)
433 return -1;
434
435 s->d1->timeout.read_timeouts++;
436 if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) {
437 s->d1->timeout.read_timeouts = 1;
438 }
439
440 dtls1_start_timer(s);
441 return dtls1_retransmit_buffered_messages(s);
442}
443
444int
445dtls1_listen(SSL *s, struct sockaddr *client)
446{
447 int ret;
448
449 /* Ensure there is no state left over from a previous invocation */
450 SSL_clear(s);
451
452 SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
453 s->d1->listen = 1;
454
455 ret = SSL_accept(s);
456 if (ret <= 0)
457 return ret;
458
459 (void)BIO_dgram_get_peer(SSL_get_rbio(s), client);
460 return 1;
461}
462
463void
464dtls1_build_sequence_number(unsigned char *dst, unsigned char *seq,
465 unsigned short epoch)
466{
467 unsigned char dtlsseq[SSL3_SEQUENCE_SIZE];
468 unsigned char *p;
469
470 p = dtlsseq;
471 s2n(epoch, p);
472 memcpy(p, &seq[2], SSL3_SEQUENCE_SIZE - 2);
473 memcpy(dst, dtlsseq, SSL3_SEQUENCE_SIZE);
474}
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