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authorcvs2svn <admin@example.com>2016-07-23 19:31:36 +0000
committercvs2svn <admin@example.com>2016-07-23 19:31:36 +0000
commit86c49b31af735796dfde37aa29473a30d36367db (patch)
treee9a354a92a348338fe2b361e2eda703cae23cfab /src/lib/libssl/d1_lib.c
parent19d5fe348e8926bac4521c5807aa64c45b8f7a41 (diff)
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This commit was manufactured by cvs2git to create tag 'OPENBSD_6_0_BASE'.OPENBSD_6_0_BASE
Diffstat (limited to 'src/lib/libssl/d1_lib.c')
-rw-r--r--src/lib/libssl/d1_lib.c468
1 files changed, 0 insertions, 468 deletions
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 1.33 2016/02/29 06:48:03 mmcc 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 pqueue_free(d1->unprocessed_rcds.q);
129 pqueue_free(d1->processed_rcds.q);
130 pqueue_free(d1->buffered_messages);
131 pqueue_free(d1->sent_messages);
132 pqueue_free(d1->buffered_app_data.q);
133 free(d1);
134 ssl3_free(s);
135 return (0);
136 }
137
138 s->d1 = d1;
139 s->method->ssl_clear(s);
140 return (1);
141}
142
143static void
144dtls1_clear_queues(SSL *s)
145{
146 pitem *item = NULL;
147 hm_fragment *frag = NULL;
148 DTLS1_RECORD_DATA *rdata;
149
150 while ((item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL) {
151 rdata = (DTLS1_RECORD_DATA *) item->data;
152 free(rdata->rbuf.buf);
153 free(item->data);
154 pitem_free(item);
155 }
156
157 while ((item = pqueue_pop(s->d1->processed_rcds.q)) != NULL) {
158 rdata = (DTLS1_RECORD_DATA *) item->data;
159 free(rdata->rbuf.buf);
160 free(item->data);
161 pitem_free(item);
162 }
163
164 while ((item = pqueue_pop(s->d1->buffered_messages)) != NULL) {
165 frag = (hm_fragment *)item->data;
166 free(frag->fragment);
167 free(frag);
168 pitem_free(item);
169 }
170
171 while ((item = pqueue_pop(s->d1->sent_messages)) != NULL) {
172 frag = (hm_fragment *)item->data;
173 free(frag->fragment);
174 free(frag);
175 pitem_free(item);
176 }
177
178 while ((item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL) {
179 rdata = (DTLS1_RECORD_DATA *) item->data;
180 free(rdata->rbuf.buf);
181 free(item->data);
182 pitem_free(item);
183 }
184}
185
186void
187dtls1_free(SSL *s)
188{
189 if (s == NULL)
190 return;
191
192 ssl3_free(s);
193
194 dtls1_clear_queues(s);
195
196 pqueue_free(s->d1->unprocessed_rcds.q);
197 pqueue_free(s->d1->processed_rcds.q);
198 pqueue_free(s->d1->buffered_messages);
199 pqueue_free(s->d1->sent_messages);
200 pqueue_free(s->d1->buffered_app_data.q);
201
202 explicit_bzero(s->d1, sizeof *s->d1);
203 free(s->d1);
204 s->d1 = NULL;
205}
206
207void
208dtls1_clear(SSL *s)
209{
210 pqueue unprocessed_rcds;
211 pqueue processed_rcds;
212 pqueue buffered_messages;
213 pqueue sent_messages;
214 pqueue buffered_app_data;
215 unsigned int mtu;
216
217 if (s->d1) {
218 unprocessed_rcds = s->d1->unprocessed_rcds.q;
219 processed_rcds = s->d1->processed_rcds.q;
220 buffered_messages = s->d1->buffered_messages;
221 sent_messages = s->d1->sent_messages;
222 buffered_app_data = s->d1->buffered_app_data.q;
223 mtu = s->d1->mtu;
224
225 dtls1_clear_queues(s);
226
227 memset(s->d1, 0, sizeof(*(s->d1)));
228
229 if (s->server) {
230 s->d1->cookie_len = sizeof(s->d1->cookie);
231 }
232
233 if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU) {
234 s->d1->mtu = mtu;
235 }
236
237 s->d1->unprocessed_rcds.q = unprocessed_rcds;
238 s->d1->processed_rcds.q = processed_rcds;
239 s->d1->buffered_messages = buffered_messages;
240 s->d1->sent_messages = sent_messages;
241 s->d1->buffered_app_data.q = buffered_app_data;
242 }
243
244 ssl3_clear(s);
245
246 s->version = DTLS1_VERSION;
247}
248
249long
250dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
251{
252 int ret = 0;
253
254 switch (cmd) {
255 case DTLS_CTRL_GET_TIMEOUT:
256 if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL) {
257 ret = 1;
258 }
259 break;
260 case DTLS_CTRL_HANDLE_TIMEOUT:
261 ret = dtls1_handle_timeout(s);
262 break;
263 case DTLS_CTRL_LISTEN:
264 ret = dtls1_listen(s, parg);
265 break;
266
267 default:
268 ret = ssl3_ctrl(s, cmd, larg, parg);
269 break;
270 }
271 return (ret);
272}
273
274/*
275 * As it's impossible to use stream ciphers in "datagram" mode, this
276 * simple filter is designed to disengage them in DTLS. Unfortunately
277 * there is no universal way to identify stream SSL_CIPHER, so we have
278 * to explicitly list their SSL_* codes. Currently RC4 is the only one
279 * available, but if new ones emerge, they will have to be added...
280 */
281const SSL_CIPHER *
282dtls1_get_cipher(unsigned int u)
283{
284 const SSL_CIPHER *ciph = ssl3_get_cipher(u);
285
286 if (ciph != NULL) {
287 if (ciph->algorithm_enc == SSL_RC4)
288 return NULL;
289 }
290
291 return ciph;
292}
293
294void
295dtls1_start_timer(SSL *s)
296{
297
298 /* If timer is not set, initialize duration with 1 second */
299 if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
300 s->d1->timeout_duration = 1;
301 }
302
303 /* Set timeout to current time */
304 gettimeofday(&(s->d1->next_timeout), NULL);
305
306 /* Add duration to current time */
307 s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
308 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
309 &(s->d1->next_timeout));
310}
311
312struct timeval*
313dtls1_get_timeout(SSL *s, struct timeval* timeleft)
314{
315 struct timeval timenow;
316
317 /* If no timeout is set, just return NULL */
318 if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0) {
319 return NULL;
320 }
321
322 /* Get current time */
323 gettimeofday(&timenow, NULL);
324
325 /* If timer already expired, set remaining time to 0 */
326 if (s->d1->next_timeout.tv_sec < timenow.tv_sec ||
327 (s->d1->next_timeout.tv_sec == timenow.tv_sec &&
328 s->d1->next_timeout.tv_usec <= timenow.tv_usec)) {
329 memset(timeleft, 0, sizeof(struct timeval));
330 return timeleft;
331 }
332
333 /* Calculate time left until timer expires */
334 memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval));
335 timeleft->tv_sec -= timenow.tv_sec;
336 timeleft->tv_usec -= timenow.tv_usec;
337 if (timeleft->tv_usec < 0) {
338 timeleft->tv_sec--;
339 timeleft->tv_usec += 1000000;
340 }
341
342 /* If remaining time is less than 15 ms, set it to 0
343 * to prevent issues because of small devergences with
344 * socket timeouts.
345 */
346 if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000) {
347 memset(timeleft, 0, sizeof(struct timeval));
348 }
349
350
351 return timeleft;
352}
353
354int
355dtls1_is_timer_expired(SSL *s)
356{
357 struct timeval timeleft;
358
359 /* Get time left until timeout, return false if no timer running */
360 if (dtls1_get_timeout(s, &timeleft) == NULL) {
361 return 0;
362 }
363
364 /* Return false if timer is not expired yet */
365 if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0) {
366 return 0;
367 }
368
369 /* Timer expired, so return true */
370 return 1;
371}
372
373void
374dtls1_double_timeout(SSL *s)
375{
376 s->d1->timeout_duration *= 2;
377 if (s->d1->timeout_duration > 60)
378 s->d1->timeout_duration = 60;
379 dtls1_start_timer(s);
380}
381
382void
383dtls1_stop_timer(SSL *s)
384{
385 /* Reset everything */
386 memset(&(s->d1->timeout), 0, sizeof(struct dtls1_timeout_st));
387 memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
388 s->d1->timeout_duration = 1;
389 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0,
390 &(s->d1->next_timeout));
391 /* Clear retransmission buffer */
392 dtls1_clear_record_buffer(s);
393}
394
395int
396dtls1_check_timeout_num(SSL *s)
397{
398 s->d1->timeout.num_alerts++;
399
400 /* Reduce MTU after 2 unsuccessful retransmissions */
401 if (s->d1->timeout.num_alerts > 2) {
402 s->d1->mtu = BIO_ctrl(SSL_get_wbio(s),
403 BIO_CTRL_DGRAM_GET_FALLBACK_MTU, 0, NULL);
404
405 }
406
407 if (s->d1->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT) {
408 /* fail the connection, enough alerts have been sent */
409 SSLerr(SSL_F_DTLS1_CHECK_TIMEOUT_NUM, SSL_R_READ_TIMEOUT_EXPIRED);
410 return -1;
411 }
412
413 return 0;
414}
415
416int
417dtls1_handle_timeout(SSL *s)
418{
419 /* if no timer is expired, don't do anything */
420 if (!dtls1_is_timer_expired(s)) {
421 return 0;
422 }
423
424 dtls1_double_timeout(s);
425
426 if (dtls1_check_timeout_num(s) < 0)
427 return -1;
428
429 s->d1->timeout.read_timeouts++;
430 if (s->d1->timeout.read_timeouts > DTLS1_TMO_READ_COUNT) {
431 s->d1->timeout.read_timeouts = 1;
432 }
433
434 dtls1_start_timer(s);
435 return dtls1_retransmit_buffered_messages(s);
436}
437
438int
439dtls1_listen(SSL *s, struct sockaddr *client)
440{
441 int ret;
442
443 /* Ensure there is no state left over from a previous invocation */
444 SSL_clear(s);
445
446 SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
447 s->d1->listen = 1;
448
449 ret = SSL_accept(s);
450 if (ret <= 0)
451 return ret;
452
453 (void)BIO_dgram_get_peer(SSL_get_rbio(s), client);
454 return 1;
455}
456
457void
458dtls1_build_sequence_number(unsigned char *dst, unsigned char *seq,
459 unsigned short epoch)
460{
461 unsigned char dtlsseq[SSL3_SEQUENCE_SIZE];
462 unsigned char *p;
463
464 p = dtlsseq;
465 s2n(epoch, p);
466 memcpy(p, &seq[2], SSL3_SEQUENCE_SIZE - 2);
467 memcpy(dst, dtlsseq, SSL3_SEQUENCE_SIZE);
468}
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