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-rw-r--r--src/lib/libssl/d1_lib.c473
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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 1.32 2015/10/07 13:20:48 bcook 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#include <sys/time.h>
63
64#include <netinet/in.h>
65
66#include <stdio.h>
67
68#include <openssl/objects.h>
69
70#include "pqueue.h"
71#include "ssl_locl.h"
72
73int dtls1_listen(SSL *s, struct sockaddr *client);
74
75SSL3_ENC_METHOD DTLSv1_enc_data = {
76 .enc = dtls1_enc,
77 .mac = tls1_mac,
78 .setup_key_block = tls1_setup_key_block,
79 .generate_master_secret = tls1_generate_master_secret,
80 .change_cipher_state = tls1_change_cipher_state,
81 .final_finish_mac = tls1_final_finish_mac,
82 .finish_mac_length = TLS1_FINISH_MAC_LENGTH,
83 .cert_verify_mac = tls1_cert_verify_mac,
84 .client_finished_label = TLS_MD_CLIENT_FINISH_CONST,
85 .client_finished_label_len = TLS_MD_CLIENT_FINISH_CONST_SIZE,
86 .server_finished_label = TLS_MD_SERVER_FINISH_CONST,
87 .server_finished_label_len = TLS_MD_SERVER_FINISH_CONST_SIZE,
88 .alert_value = tls1_alert_code,
89 .export_keying_material = tls1_export_keying_material,
90 .enc_flags = SSL_ENC_FLAG_DTLS|SSL_ENC_FLAG_EXPLICIT_IV,
91};
92
93long
94dtls1_default_timeout(void)
95{
96 /* 2 hours, the 24 hours mentioned in the DTLSv1 spec
97 * is way too long for http, the cache would over fill */
98 return (60*60*2);
99}
100
101int
102dtls1_new(SSL *s)
103{
104 DTLS1_STATE *d1;
105
106 if (!ssl3_new(s))
107 return (0);
108 if ((d1 = calloc(1, sizeof *d1)) == NULL) {
109 ssl3_free(s);
110 return (0);
111 }
112
113 /* d1->handshake_epoch=0; */
114
115 d1->unprocessed_rcds.q = pqueue_new();
116 d1->processed_rcds.q = pqueue_new();
117 d1->buffered_messages = pqueue_new();
118 d1->sent_messages = pqueue_new();
119 d1->buffered_app_data.q = pqueue_new();
120
121 if (s->server) {
122 d1->cookie_len = sizeof(s->d1->cookie);
123 }
124
125 if (!d1->unprocessed_rcds.q || !d1->processed_rcds.q ||
126 !d1->buffered_messages || !d1->sent_messages ||
127 !d1->buffered_app_data.q) {
128 if (d1->unprocessed_rcds.q)
129 pqueue_free(d1->unprocessed_rcds.q);
130 if (d1->processed_rcds.q)
131 pqueue_free(d1->processed_rcds.q);
132 if (d1->buffered_messages)
133 pqueue_free(d1->buffered_messages);
134 if (d1->sent_messages)
135 pqueue_free(d1->sent_messages);
136 if (d1->buffered_app_data.q)
137 pqueue_free(d1->buffered_app_data.q);
138 free(d1);
139 ssl3_free(s);
140 return (0);
141 }
142
143 s->d1 = d1;
144 s->method->ssl_clear(s);
145 return (1);
146}
147
148static void
149dtls1_clear_queues(SSL *s)
150{
151 pitem *item = NULL;
152 hm_fragment *frag = NULL;
153 DTLS1_RECORD_DATA *rdata;
154
155 while ((item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL) {
156 rdata = (DTLS1_RECORD_DATA *) item->data;
157 free(rdata->rbuf.buf);
158 free(item->data);
159 pitem_free(item);
160 }
161
162 while ((item = pqueue_pop(s->d1->processed_rcds.q)) != NULL) {
163 rdata = (DTLS1_RECORD_DATA *) item->data;
164 free(rdata->rbuf.buf);
165 free(item->data);
166 pitem_free(item);
167 }
168
169 while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) {
170 frag = (hm_fragment *)item->data;
171 free(frag->fragment);
172 free(frag);
173 pitem_free(item);
174 }
175
176 while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) {
177 frag = (hm_fragment *)item->data;
178 free(frag->fragment);
179 free(frag);
180 pitem_free(item);
181 }
182
183 while ((item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL) {
184 rdata = (DTLS1_RECORD_DATA *) item->data;
185 free(rdata->rbuf.buf);
186 free(item->data);
187 pitem_free(item);
188 }
189}
190
191void
192dtls1_free(SSL *s)
193{
194 if (s == NULL)
195 return;
196
197 ssl3_free(s);
198
199 dtls1_clear_queues(s);
200
201 pqueue_free(s->d1->unprocessed_rcds.q);
202 pqueue_free(s->d1->processed_rcds.q);
203 pqueue_free(s->d1->buffered_messages);
204 pqueue_free(s->d1->sent_messages);
205 pqueue_free(s->d1->buffered_app_data.q);
206
207 explicit_bzero(s->d1, sizeof *s->d1);
208 free(s->d1);
209 s->d1 = NULL;
210}
211
212void
213dtls1_clear(SSL *s)
214{
215 pqueue unprocessed_rcds;
216 pqueue processed_rcds;
217 pqueue buffered_messages;
218 pqueue sent_messages;
219 pqueue buffered_app_data;
220 unsigned int mtu;
221
222 if (s->d1) {
223 unprocessed_rcds = s->d1->unprocessed_rcds.q;
224 processed_rcds = s->d1->processed_rcds.q;
225 buffered_messages = s->d1->buffered_messages;
226 sent_messages = s->d1->sent_messages;
227 buffered_app_data = s->d1->buffered_app_data.q;
228 mtu = s->d1->mtu;
229
230 dtls1_clear_queues(s);
231
232 memset(s->d1, 0, sizeof(*(s->d1)));
233
234 if (s->server) {
235 s->d1->cookie_len = sizeof(s->d1->cookie);
236 }
237
238 if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
239 s->d1->mtu = mtu;
240 }
241
242 s->d1->unprocessed_rcds.q = unprocessed_rcds;
243 s->d1->processed_rcds.q = processed_rcds;
244 s->d1->buffered_messages = buffered_messages;
245 s->d1->sent_messages = sent_messages;
246 s->d1->buffered_app_data.q = buffered_app_data;
247 }
248
249 ssl3_clear(s);
250
251 s->version = DTLS1_VERSION;
252}
253
254long
255dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
256{
257 int ret = 0;
258
259 switch (cmd) {
260 case DTLS_CTRL_GET_TIMEOUT:
261 if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL) {
262 ret = 1;
263 }
264 break;
265 case DTLS_CTRL_HANDLE_TIMEOUT:
266 ret = dtls1_handle_timeout(s);
267 break;
268 case DTLS_CTRL_LISTEN:
269 ret = dtls1_listen(s, parg);
270 break;
271
272 default:
273 ret = ssl3_ctrl(s, cmd, larg, parg);
274 break;
275 }
276 return (ret);
277}
278
279/*
280 * As it's impossible to use stream ciphers in "datagram" mode, this
281 * simple filter is designed to disengage them in DTLS. Unfortunately
282 * there is no universal way to identify stream SSL_CIPHER, so we have
283 * to explicitly list their SSL_* codes. Currently RC4 is the only one
284 * available, but if new ones emerge, they will have to be added...
285 */
286const SSL_CIPHER *
287dtls1_get_cipher(unsigned int u)
288{
289 const SSL_CIPHER *ciph = ssl3_get_cipher(u);
290
291 if (ciph != NULL) {
292 if (ciph->algorithm_enc == SSL_RC4)
293 return NULL;
294 }
295
296 return ciph;
297}
298
299void
300dtls1_start_timer(SSL *s)
301{
302
303 /* If timer is not set, initialize duration with 1 second */
304 if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
305 s->d1->timeout_duration = 1;
306 }
307
308 /* Set timeout to current time */
309 gettimeofday(&(s->d1->next_timeout), NULL);
310
311 /* Add duration to current time */
312 s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
313 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
314 &(s->d1->next_timeout));
315}
316
317struct timeval*
318dtls1_get_timeout(SSL *s, struct timeval* timeleft)
319{
320 struct timeval timenow;
321
322 /* If no timeout is set, just return NULL */
323 if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
324 return NULL;
325 }
326
327 /* Get current time */
328 gettimeofday(&timenow, NULL);
329
330 /* If timer already expired, set remaining time to 0 */
331 if (s->d1->next_timeout.tv_sec < timenow.tv_sec ||
332 (s->d1->next_timeout.tv_sec == timenow.tv_sec &&
333 s->d1->next_timeout.tv_usec <= timenow.tv_usec)) {
334 memset(timeleft, 0, sizeof(struct timeval));
335 return timeleft;
336 }
337
338 /* Calculate time left until timer expires */
339 memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval));
340 timeleft->tv_sec -= timenow.tv_sec;
341 timeleft->tv_usec -= timenow.tv_usec;
342 if (timeleft->tv_usec < 0) {
343 timeleft->tv_sec--;
344 timeleft->tv_usec += 1000000;
345 }
346
347 /* If remaining time is less than 15 ms, set it to 0
348 * to prevent issues because of small devergences with
349 * socket timeouts.
350 */
351 if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) {
352 memset(timeleft, 0, sizeof(struct timeval));
353 }
354
355
356 return timeleft;
357}
358
359int
360dtls1_is_timer_expired(SSL *s)
361{
362 struct timeval timeleft;
363
364 /* Get time left until timeout, return false if no timer running */
365 if (dtls1_get_timeout(s, &timeleft) == NULL) {
366 return 0;
367 }
368
369 /* Return false if timer is not expired yet */
370 if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) {
371 return 0;
372 }
373
374 /* Timer expired, so return true */
375 return 1;
376}
377
378void
379dtls1_double_timeout(SSL *s)
380{
381 s->d1->timeout_duration *= 2;
382 if (s->d1->timeout_duration > 60)
383 s->d1->timeout_duration = 60;
384 dtls1_start_timer(s);
385}
386
387void
388dtls1_stop_timer(SSL *s)
389{
390 /* Reset everything */
391 memset(&(s->d1->timeout), 0, sizeof(struct dtls1_timeout_st));
392 memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
393 s->d1->timeout_duration = 1;
394 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
395 &(s->d1->next_timeout));
396 /* Clear retransmission buffer */
397 dtls1_clear_record_buffer(s);
398}
399
400int
401dtls1_check_timeout_num(SSL *s)
402{
403 s->d1->timeout.num_alerts++;
404
405 /* Reduce MTU after 2 unsuccessful retransmissions */
406 if (s->d1->timeout.num_alerts > 2) {
407 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
408 BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
409
410 }
411
412 if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
413 /* fail the connection, enough alerts have been sent */
414 SSLerr(SSL_F_DTLS1_CHECK_TIMEOUT_NUM, SSL_R_READ_TIMEOUT_EXPIRED);
415 return -1;
416 }
417
418 return 0;
419}
420
421int
422dtls1_handle_timeout(SSL *s)
423{
424 /* if no timer is expired, don't do anything */
425 if (!dtls1_is_timer_expired(s)) {
426 return 0;
427 }
428
429 dtls1_double_timeout(s);
430
431 if (dtls1_check_timeout_num(s) < 0)
432 return -1;
433
434 s->d1->timeout.read_timeouts++;
435 if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) {
436 s->d1->timeout.read_timeouts = 1;
437 }
438
439 dtls1_start_timer(s);
440 return dtls1_retransmit_buffered_messages(s);
441}
442
443int
444dtls1_listen(SSL *s, struct sockaddr *client)
445{
446 int ret;
447
448 /* Ensure there is no state left over from a previous invocation */
449 SSL_clear(s);
450
451 SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
452 s->d1->listen = 1;
453
454 ret = SSL_accept(s);
455 if (ret <= 0)
456 return ret;
457
458 (void)BIO_dgram_get_peer(SSL_get_rbio(s), client);
459 return 1;
460}
461
462void
463dtls1_build_sequence_number(unsigned char *dst, unsigned char *seq,
464 unsigned short epoch)
465{
466 unsigned char dtlsseq[SSL3_SEQUENCE_SIZE];
467 unsigned char *p;
468
469 p = dtlsseq;
470 s2n(epoch, p);
471 memcpy(p, &seq[2], SSL3_SEQUENCE_SIZE - 2);
472 memcpy(dst, dtlsseq, SSL3_SEQUENCE_SIZE);
473}
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