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authorcvs2svn <admin@example.com>2012-07-13 17:49:55 +0000
committercvs2svn <admin@example.com>2012-07-13 17:49:55 +0000
commit6fdb436ab2cd5b35066babb3a03be7ad0daf1ae2 (patch)
treea760cf389e7ea59961bb306a1f50bf5443205176 /src/lib/libssl/d1_lib.c
parent9204e59073bcf27e1487ec4ac46e981902ddd904 (diff)
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This commit was manufactured by cvs2git to create tag 'OPENBSD_5_2_BASE'.OPENBSD_5_2_BASE
Diffstat (limited to 'src/lib/libssl/d1_lib.c')
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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/* ssl/d1_lib.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
60#include <stdio.h>
61#define USE_SOCKETS
62#include <openssl/objects.h>
63#include "ssl_locl.h"
64
65#if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS)
66#include <sys/timeb.h>
67#endif
68
69static void get_current_time(struct timeval *t);
70const char dtls1_version_str[]="DTLSv1" OPENSSL_VERSION_PTEXT;
71int dtls1_listen(SSL *s, struct sockaddr *client);
72
73SSL3_ENC_METHOD DTLSv1_enc_data={
74 dtls1_enc,
75 tls1_mac,
76 tls1_setup_key_block,
77 tls1_generate_master_secret,
78 tls1_change_cipher_state,
79 tls1_final_finish_mac,
80 TLS1_FINISH_MAC_LENGTH,
81 tls1_cert_verify_mac,
82 TLS_MD_CLIENT_FINISH_CONST,TLS_MD_CLIENT_FINISH_CONST_SIZE,
83 TLS_MD_SERVER_FINISH_CONST,TLS_MD_SERVER_FINISH_CONST_SIZE,
84 tls1_alert_code,
85 };
86
87long dtls1_default_timeout(void)
88 {
89 /* 2 hours, the 24 hours mentioned in the DTLSv1 spec
90 * is way too long for http, the cache would over fill */
91 return(60*60*2);
92 }
93
94int dtls1_new(SSL *s)
95 {
96 DTLS1_STATE *d1;
97
98 if (!ssl3_new(s)) return(0);
99 if ((d1=OPENSSL_malloc(sizeof *d1)) == NULL) return (0);
100 memset(d1,0, sizeof *d1);
101
102 /* d1->handshake_epoch=0; */
103
104 d1->unprocessed_rcds.q=pqueue_new();
105 d1->processed_rcds.q=pqueue_new();
106 d1->buffered_messages = pqueue_new();
107 d1->sent_messages=pqueue_new();
108 d1->buffered_app_data.q=pqueue_new();
109
110 if ( s->server)
111 {
112 d1->cookie_len = sizeof(s->d1->cookie);
113 }
114
115 if( ! d1->unprocessed_rcds.q || ! d1->processed_rcds.q
116 || ! d1->buffered_messages || ! d1->sent_messages || ! d1->buffered_app_data.q)
117 {
118 if ( d1->unprocessed_rcds.q) pqueue_free(d1->unprocessed_rcds.q);
119 if ( d1->processed_rcds.q) pqueue_free(d1->processed_rcds.q);
120 if ( d1->buffered_messages) pqueue_free(d1->buffered_messages);
121 if ( d1->sent_messages) pqueue_free(d1->sent_messages);
122 if ( d1->buffered_app_data.q) pqueue_free(d1->buffered_app_data.q);
123 OPENSSL_free(d1);
124 return (0);
125 }
126
127 s->d1=d1;
128 s->method->ssl_clear(s);
129 return(1);
130 }
131
132static void dtls1_clear_queues(SSL *s)
133 {
134 pitem *item = NULL;
135 hm_fragment *frag = NULL;
136 DTLS1_RECORD_DATA *rdata;
137
138 while( (item = pqueue_pop(s->d1->unprocessed_rcds.q)) != NULL)
139 {
140 rdata = (DTLS1_RECORD_DATA *) item->data;
141 if (rdata->rbuf.buf)
142 {
143 OPENSSL_free(rdata->rbuf.buf);
144 }
145 OPENSSL_free(item->data);
146 pitem_free(item);
147 }
148
149 while( (item = pqueue_pop(s->d1->processed_rcds.q)) != NULL)
150 {
151 rdata = (DTLS1_RECORD_DATA *) item->data;
152 if (rdata->rbuf.buf)
153 {
154 OPENSSL_free(rdata->rbuf.buf);
155 }
156 OPENSSL_free(item->data);
157 pitem_free(item);
158 }
159
160 while( (item = pqueue_pop(s->d1->buffered_messages)) != NULL)
161 {
162 frag = (hm_fragment *)item->data;
163 OPENSSL_free(frag->fragment);
164 OPENSSL_free(frag);
165 pitem_free(item);
166 }
167
168 while ( (item = pqueue_pop(s->d1->sent_messages)) != NULL)
169 {
170 frag = (hm_fragment *)item->data;
171 OPENSSL_free(frag->fragment);
172 OPENSSL_free(frag);
173 pitem_free(item);
174 }
175
176 while ( (item = pqueue_pop(s->d1->buffered_app_data.q)) != NULL)
177 {
178 frag = (hm_fragment *)item->data;
179 OPENSSL_free(frag->fragment);
180 OPENSSL_free(frag);
181 pitem_free(item);
182 }
183 }
184
185void dtls1_free(SSL *s)
186 {
187 ssl3_free(s);
188
189 dtls1_clear_queues(s);
190
191 pqueue_free(s->d1->unprocessed_rcds.q);
192 pqueue_free(s->d1->processed_rcds.q);
193 pqueue_free(s->d1->buffered_messages);
194 pqueue_free(s->d1->sent_messages);
195 pqueue_free(s->d1->buffered_app_data.q);
196
197 OPENSSL_free(s->d1);
198 }
199
200void dtls1_clear(SSL *s)
201 {
202 pqueue unprocessed_rcds;
203 pqueue processed_rcds;
204 pqueue buffered_messages;
205 pqueue sent_messages;
206 pqueue buffered_app_data;
207 unsigned int mtu;
208
209 if (s->d1)
210 {
211 unprocessed_rcds = s->d1->unprocessed_rcds.q;
212 processed_rcds = s->d1->processed_rcds.q;
213 buffered_messages = s->d1->buffered_messages;
214 sent_messages = s->d1->sent_messages;
215 buffered_app_data = s->d1->buffered_app_data.q;
216 mtu = s->d1->mtu;
217
218 dtls1_clear_queues(s);
219
220 memset(s->d1, 0, sizeof(*(s->d1)));
221
222 if (s->server)
223 {
224 s->d1->cookie_len = sizeof(s->d1->cookie);
225 }
226
227 if (SSL_get_options(s) & SSL_OP_NO_QUERY_MTU)
228 {
229 s->d1->mtu = mtu;
230 }
231
232 s->d1->unprocessed_rcds.q = unprocessed_rcds;
233 s->d1->processed_rcds.q = processed_rcds;
234 s->d1->buffered_messages = buffered_messages;
235 s->d1->sent_messages = sent_messages;
236 s->d1->buffered_app_data.q = buffered_app_data;
237 }
238
239 ssl3_clear(s);
240 if (s->options & SSL_OP_CISCO_ANYCONNECT)
241 s->version=DTLS1_BAD_VER;
242 else
243 s->version=DTLS1_VERSION;
244 }
245
246long dtls1_ctrl(SSL *s, int cmd, long larg, void *parg)
247 {
248 int ret=0;
249
250 switch (cmd)
251 {
252 case DTLS_CTRL_GET_TIMEOUT:
253 if (dtls1_get_timeout(s, (struct timeval*) parg) != NULL)
254 {
255 ret = 1;
256 }
257 break;
258 case DTLS_CTRL_HANDLE_TIMEOUT:
259 ret = dtls1_handle_timeout(s);
260 break;
261 case DTLS_CTRL_LISTEN:
262 ret = dtls1_listen(s, parg);
263 break;
264
265 default:
266 ret = ssl3_ctrl(s, cmd, larg, parg);
267 break;
268 }
269 return(ret);
270 }
271
272/*
273 * As it's impossible to use stream ciphers in "datagram" mode, this
274 * simple filter is designed to disengage them in DTLS. Unfortunately
275 * there is no universal way to identify stream SSL_CIPHER, so we have
276 * to explicitly list their SSL_* codes. Currently RC4 is the only one
277 * available, but if new ones emerge, they will have to be added...
278 */
279const SSL_CIPHER *dtls1_get_cipher(unsigned int u)
280 {
281 const SSL_CIPHER *ciph = ssl3_get_cipher(u);
282
283 if (ciph != NULL)
284 {
285 if (ciph->algorithm_enc == SSL_RC4)
286 return NULL;
287 }
288
289 return ciph;
290 }
291
292void dtls1_start_timer(SSL *s)
293 {
294 /* If timer is not set, initialize duration with 1 second */
295 if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0)
296 {
297 s->d1->timeout_duration = 1;
298 }
299
300 /* Set timeout to current time */
301 get_current_time(&(s->d1->next_timeout));
302
303 /* Add duration to current time */
304 s->d1->next_timeout.tv_sec += s->d1->timeout_duration;
305 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &(s->d1->next_timeout));
306 }
307
308struct timeval* dtls1_get_timeout(SSL *s, struct timeval* timeleft)
309 {
310 struct timeval timenow;
311
312 /* If no timeout is set, just return NULL */
313 if (s->d1->next_timeout.tv_sec == 0 && s->d1->next_timeout.tv_usec == 0)
314 {
315 return NULL;
316 }
317
318 /* Get current time */
319 get_current_time(&timenow);
320
321 /* If timer already expired, set remaining time to 0 */
322 if (s->d1->next_timeout.tv_sec < timenow.tv_sec ||
323 (s->d1->next_timeout.tv_sec == timenow.tv_sec &&
324 s->d1->next_timeout.tv_usec <= timenow.tv_usec))
325 {
326 memset(timeleft, 0, sizeof(struct timeval));
327 return timeleft;
328 }
329
330 /* Calculate time left until timer expires */
331 memcpy(timeleft, &(s->d1->next_timeout), sizeof(struct timeval));
332 timeleft->tv_sec -= timenow.tv_sec;
333 timeleft->tv_usec -= timenow.tv_usec;
334 if (timeleft->tv_usec < 0)
335 {
336 timeleft->tv_sec--;
337 timeleft->tv_usec += 1000000;
338 }
339
340 /* If remaining time is less than 15 ms, set it to 0
341 * to prevent issues because of small devergences with
342 * socket timeouts.
343 */
344 if (timeleft->tv_sec == 0 && timeleft->tv_usec < 15000)
345 {
346 memset(timeleft, 0, sizeof(struct timeval));
347 }
348
349
350 return timeleft;
351 }
352
353int dtls1_is_timer_expired(SSL *s)
354 {
355 struct timeval timeleft;
356
357 /* Get time left until timeout, return false if no timer running */
358 if (dtls1_get_timeout(s, &timeleft) == NULL)
359 {
360 return 0;
361 }
362
363 /* Return false if timer is not expired yet */
364 if (timeleft.tv_sec > 0 || timeleft.tv_usec > 0)
365 {
366 return 0;
367 }
368
369 /* Timer expired, so return true */
370 return 1;
371 }
372
373void dtls1_double_timeout(SSL *s)
374 {
375 s->d1->timeout_duration *= 2;
376 if (s->d1->timeout_duration > 60)
377 s->d1->timeout_duration = 60;
378 dtls1_start_timer(s);
379 }
380
381void dtls1_stop_timer(SSL *s)
382 {
383 /* Reset everything */
384 memset(&(s->d1->next_timeout), 0, sizeof(struct timeval));
385 s->d1->timeout_duration = 1;
386 BIO_ctrl(SSL_get_rbio(s), BIO_CTRL_DGRAM_SET_NEXT_TIMEOUT, 0, &(s->d1->next_timeout));
387 /* Clear retransmission buffer */
388 dtls1_clear_record_buffer(s);
389 }
390
391int dtls1_handle_timeout(SSL *s)
392 {
393 DTLS1_STATE *state;
394
395 /* if no timer is expired, don't do anything */
396 if (!dtls1_is_timer_expired(s))
397 {
398 return 0;
399 }
400
401 dtls1_double_timeout(s);
402 state = s->d1;
403 state->timeout.num_alerts++;
404 if ( state->timeout.num_alerts > DTLS1_TMO_ALERT_COUNT)
405 {
406 /* fail the connection, enough alerts have been sent */
407 SSLerr(SSL_F_DTLS1_HANDLE_TIMEOUT,SSL_R_READ_TIMEOUT_EXPIRED);
408 return -1;
409 }
410
411 state->timeout.read_timeouts++;
412 if ( state->timeout.read_timeouts > DTLS1_TMO_READ_COUNT)
413 {
414 state->timeout.read_timeouts = 1;
415 }
416
417 dtls1_start_timer(s);
418 return dtls1_retransmit_buffered_messages(s);
419 }
420
421static void get_current_time(struct timeval *t)
422{
423#ifdef OPENSSL_SYS_WIN32
424 struct _timeb tb;
425 _ftime(&tb);
426 t->tv_sec = (long)tb.time;
427 t->tv_usec = (long)tb.millitm * 1000;
428#elif defined(OPENSSL_SYS_VMS)
429 struct timeb tb;
430 ftime(&tb);
431 t->tv_sec = (long)tb.time;
432 t->tv_usec = (long)tb.millitm * 1000;
433#else
434 gettimeofday(t, NULL);
435#endif
436}
437
438int dtls1_listen(SSL *s, struct sockaddr *client)
439 {
440 int ret;
441
442 SSL_set_options(s, SSL_OP_COOKIE_EXCHANGE);
443 s->d1->listen = 1;
444
445 ret = SSL_accept(s);
446 if (ret <= 0) return ret;
447
448 (void) BIO_dgram_get_peer(SSL_get_rbio(s), client);
449 return 1;
450 }
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