1 /*
2 * WPA Supplicant - RSN PMKSA cache
3 * Copyright (c) 2004-2009, 2011-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "eloop.h"
13 #include "eapol_supp/eapol_supp_sm.h"
14 #include "wpa.h"
15 #include "wpa_i.h"
16 #include "pmksa_cache.h"
17
18 #if defined(IEEE8021X_EAPOL) && !defined(CONFIG_NO_WPA)
19
20 static const int pmksa_cache_max_entries = 32;
21
22 struct rsn_pmksa_cache {
23 struct rsn_pmksa_cache_entry *pmksa; /* PMKSA cache */
24 int pmksa_count; /* number of entries in PMKSA cache */
25 struct wpa_sm *sm; /* TODO: get rid of this reference(?) */
26
27 void (*free_cb)(struct rsn_pmksa_cache_entry *entry, void *ctx,
28 enum pmksa_free_reason reason);
29 void *ctx;
30 };
31
32
33 static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa);
34
35
_pmksa_cache_free_entry(struct rsn_pmksa_cache_entry * entry)36 static void _pmksa_cache_free_entry(struct rsn_pmksa_cache_entry *entry)
37 {
38 bin_clear_free(entry, sizeof(*entry));
39 }
40
41
pmksa_cache_free_entry(struct rsn_pmksa_cache * pmksa,struct rsn_pmksa_cache_entry * entry,enum pmksa_free_reason reason)42 static void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa,
43 struct rsn_pmksa_cache_entry *entry,
44 enum pmksa_free_reason reason)
45 {
46 wpa_sm_remove_pmkid(pmksa->sm, entry->network_ctx, entry->aa,
47 entry->pmkid,
48 entry->fils_cache_id_set ? entry->fils_cache_id :
49 NULL);
50 pmksa->pmksa_count--;
51 pmksa->free_cb(entry, pmksa->ctx, reason);
52 _pmksa_cache_free_entry(entry);
53 }
54
55
pmksa_cache_expire(void * eloop_ctx,void * timeout_ctx)56 static void pmksa_cache_expire(void *eloop_ctx, void *timeout_ctx)
57 {
58 struct rsn_pmksa_cache *pmksa = eloop_ctx;
59 struct os_reltime now;
60
61 os_get_reltime(&now);
62 while (pmksa->pmksa && pmksa->pmksa->expiration <= now.sec) {
63 struct rsn_pmksa_cache_entry *entry = pmksa->pmksa;
64 pmksa->pmksa = entry->next;
65 wpa_printf(MSG_DEBUG, "RSN: expired PMKSA cache entry for "
66 MACSTR, MAC2STR(entry->aa));
67 pmksa_cache_free_entry(pmksa, entry, PMKSA_EXPIRE);
68 }
69
70 pmksa_cache_set_expiration(pmksa);
71 }
72
73
pmksa_cache_reauth(void * eloop_ctx,void * timeout_ctx)74 static void pmksa_cache_reauth(void *eloop_ctx, void *timeout_ctx)
75 {
76 struct rsn_pmksa_cache *pmksa = eloop_ctx;
77 pmksa->sm->cur_pmksa = NULL;
78 eapol_sm_request_reauth(pmksa->sm->eapol);
79 }
80
81
pmksa_cache_set_expiration(struct rsn_pmksa_cache * pmksa)82 static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa)
83 {
84 int sec;
85 struct rsn_pmksa_cache_entry *entry;
86 struct os_reltime now;
87
88 eloop_cancel_timeout(pmksa_cache_expire, pmksa, NULL);
89 eloop_cancel_timeout(pmksa_cache_reauth, pmksa, NULL);
90 if (pmksa->pmksa == NULL)
91 return;
92 os_get_reltime(&now);
93 sec = pmksa->pmksa->expiration - now.sec;
94 if (sec < 0)
95 sec = 0;
96 eloop_register_timeout(sec + 1, 0, pmksa_cache_expire, pmksa, NULL);
97
98 entry = pmksa->sm->cur_pmksa ? pmksa->sm->cur_pmksa :
99 pmksa_cache_get(pmksa, pmksa->sm->bssid, NULL, NULL, 0);
100 if (entry) {
101 sec = pmksa->pmksa->reauth_time - now.sec;
102 if (sec < 0)
103 sec = 0;
104 eloop_register_timeout(sec, 0, pmksa_cache_reauth, pmksa,
105 NULL);
106 }
107 }
108
109
110 /**
111 * pmksa_cache_add - Add a PMKSA cache entry
112 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()
113 * @pmk: The new pairwise master key
114 * @pmk_len: PMK length in bytes, usually PMK_LEN (32)
115 * @pmkid: Calculated PMKID
116 * @kck: Key confirmation key or %NULL if not yet derived
117 * @kck_len: KCK length in bytes
118 * @aa: Authenticator address
119 * @spa: Supplicant address
120 * @network_ctx: Network configuration context for this PMK
121 * @akmp: WPA_KEY_MGMT_* used in key derivation
122 * @cache_id: Pointer to FILS Cache Identifier or %NULL if not advertised
123 * Returns: Pointer to the added PMKSA cache entry or %NULL on error
124 *
125 * This function create a PMKSA entry for a new PMK and adds it to the PMKSA
126 * cache. If an old entry is already in the cache for the same Authenticator,
127 * this entry will be replaced with the new entry. PMKID will be calculated
128 * based on the PMK and the driver interface is notified of the new PMKID.
129 */
130 struct rsn_pmksa_cache_entry *
pmksa_cache_add(struct rsn_pmksa_cache * pmksa,const u8 * pmk,size_t pmk_len,const u8 * pmkid,const u8 * kck,size_t kck_len,const u8 * aa,const u8 * spa,void * network_ctx,int akmp,const u8 * cache_id)131 pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
132 const u8 *pmkid, const u8 *kck, size_t kck_len,
133 const u8 *aa, const u8 *spa, void *network_ctx, int akmp,
134 const u8 *cache_id)
135 {
136 struct rsn_pmksa_cache_entry *entry;
137 struct os_reltime now;
138
139 if (pmk_len > PMK_LEN_MAX)
140 return NULL;
141
142 if (wpa_key_mgmt_suite_b(akmp) && !kck)
143 return NULL;
144
145 entry = os_zalloc(sizeof(*entry));
146 if (entry == NULL)
147 return NULL;
148 os_memcpy(entry->pmk, pmk, pmk_len);
149 entry->pmk_len = pmk_len;
150 if (pmkid)
151 os_memcpy(entry->pmkid, pmkid, PMKID_LEN);
152 else if (akmp == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192)
153 rsn_pmkid_suite_b_192(kck, kck_len, aa, spa, entry->pmkid);
154 else if (wpa_key_mgmt_suite_b(akmp))
155 rsn_pmkid_suite_b(kck, kck_len, aa, spa, entry->pmkid);
156 else
157 rsn_pmkid(pmk, pmk_len, aa, spa, entry->pmkid, akmp);
158 os_get_reltime(&now);
159 entry->expiration = now.sec + pmksa->sm->dot11RSNAConfigPMKLifetime;
160 entry->reauth_time = now.sec + pmksa->sm->dot11RSNAConfigPMKLifetime *
161 pmksa->sm->dot11RSNAConfigPMKReauthThreshold / 100;
162 entry->akmp = akmp;
163 if (cache_id) {
164 entry->fils_cache_id_set = 1;
165 os_memcpy(entry->fils_cache_id, cache_id, FILS_CACHE_ID_LEN);
166 }
167 os_memcpy(entry->aa, aa, ETH_ALEN);
168 entry->network_ctx = network_ctx;
169
170 return pmksa_cache_add_entry(pmksa, entry);
171 }
172
173
174 struct rsn_pmksa_cache_entry *
pmksa_cache_add_entry(struct rsn_pmksa_cache * pmksa,struct rsn_pmksa_cache_entry * entry)175 pmksa_cache_add_entry(struct rsn_pmksa_cache *pmksa,
176 struct rsn_pmksa_cache_entry *entry)
177 {
178 struct rsn_pmksa_cache_entry *pos, *prev;
179
180 /* Replace an old entry for the same Authenticator (if found) with the
181 * new entry */
182 pos = pmksa->pmksa;
183 prev = NULL;
184 while (pos) {
185 if (os_memcmp(entry->aa, pos->aa, ETH_ALEN) == 0) {
186 if (pos->pmk_len == entry->pmk_len &&
187 os_memcmp_const(pos->pmk, entry->pmk,
188 entry->pmk_len) == 0 &&
189 os_memcmp_const(pos->pmkid, entry->pmkid,
190 PMKID_LEN) == 0) {
191 wpa_printf(MSG_DEBUG, "WPA: reusing previous "
192 "PMKSA entry");
193 os_free(entry);
194 return pos;
195 }
196 if (prev == NULL)
197 pmksa->pmksa = pos->next;
198 else
199 prev->next = pos->next;
200
201 /*
202 * If OKC is used, there may be other PMKSA cache
203 * entries based on the same PMK. These needs to be
204 * flushed so that a new entry can be created based on
205 * the new PMK. Only clear other entries if they have a
206 * matching PMK and this PMK has been used successfully
207 * with the current AP, i.e., if opportunistic flag has
208 * been cleared in wpa_supplicant_key_neg_complete().
209 */
210 wpa_printf(MSG_DEBUG, "RSN: Replace PMKSA entry for "
211 "the current AP and any PMKSA cache entry "
212 "that was based on the old PMK");
213 if (!pos->opportunistic)
214 pmksa_cache_flush(pmksa, entry->network_ctx,
215 pos->pmk, pos->pmk_len);
216 pmksa_cache_free_entry(pmksa, pos, PMKSA_REPLACE);
217 break;
218 }
219 prev = pos;
220 pos = pos->next;
221 }
222
223 if (pmksa->pmksa_count >= pmksa_cache_max_entries && pmksa->pmksa) {
224 /* Remove the oldest entry to make room for the new entry */
225 pos = pmksa->pmksa;
226
227 if (pos == pmksa->sm->cur_pmksa) {
228 /*
229 * Never remove the current PMKSA cache entry, since
230 * it's in use, and removing it triggers a needless
231 * deauthentication.
232 */
233 pos = pos->next;
234 pmksa->pmksa->next = pos ? pos->next : NULL;
235 } else
236 pmksa->pmksa = pos->next;
237
238 if (pos) {
239 wpa_printf(MSG_DEBUG, "RSN: removed the oldest idle "
240 "PMKSA cache entry (for " MACSTR ") to "
241 "make room for new one",
242 MAC2STR(pos->aa));
243 pmksa_cache_free_entry(pmksa, pos, PMKSA_FREE);
244 }
245 }
246
247 /* Add the new entry; order by expiration time */
248 pos = pmksa->pmksa;
249 prev = NULL;
250 while (pos) {
251 if (pos->expiration > entry->expiration)
252 break;
253 prev = pos;
254 pos = pos->next;
255 }
256 if (prev == NULL) {
257 entry->next = pmksa->pmksa;
258 pmksa->pmksa = entry;
259 pmksa_cache_set_expiration(pmksa);
260 } else {
261 entry->next = prev->next;
262 prev->next = entry;
263 }
264 pmksa->pmksa_count++;
265 wpa_printf(MSG_DEBUG, "RSN: Added PMKSA cache entry for " MACSTR
266 " network_ctx=%p akmp=0x%x", MAC2STR(entry->aa),
267 entry->network_ctx, entry->akmp);
268 wpa_sm_add_pmkid(pmksa->sm, entry->network_ctx, entry->aa, entry->pmkid,
269 entry->fils_cache_id_set ? entry->fils_cache_id : NULL,
270 entry->pmk, entry->pmk_len);
271
272 return entry;
273 }
274
275
276 /**
277 * pmksa_cache_flush - Flush PMKSA cache entries for a specific network
278 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()
279 * @network_ctx: Network configuration context or %NULL to flush all entries
280 * @pmk: PMK to match for or %NYLL to match all PMKs
281 * @pmk_len: PMK length
282 */
pmksa_cache_flush(struct rsn_pmksa_cache * pmksa,void * network_ctx,const u8 * pmk,size_t pmk_len)283 void pmksa_cache_flush(struct rsn_pmksa_cache *pmksa, void *network_ctx,
284 const u8 *pmk, size_t pmk_len)
285 {
286 struct rsn_pmksa_cache_entry *entry, *prev = NULL, *tmp;
287 int removed = 0;
288
289 entry = pmksa->pmksa;
290 while (entry) {
291 if ((entry->network_ctx == network_ctx ||
292 network_ctx == NULL) &&
293 (pmk == NULL ||
294 (pmk_len == entry->pmk_len &&
295 os_memcmp(pmk, entry->pmk, pmk_len) == 0))) {
296 wpa_printf(MSG_DEBUG, "RSN: Flush PMKSA cache entry "
297 "for " MACSTR, MAC2STR(entry->aa));
298 if (prev)
299 prev->next = entry->next;
300 else
301 pmksa->pmksa = entry->next;
302 tmp = entry;
303 entry = entry->next;
304 pmksa_cache_free_entry(pmksa, tmp, PMKSA_FREE);
305 removed++;
306 } else {
307 prev = entry;
308 entry = entry->next;
309 }
310 }
311 if (removed)
312 pmksa_cache_set_expiration(pmksa);
313 }
314
315
316 /**
317 * pmksa_cache_deinit - Free all entries in PMKSA cache
318 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()
319 */
pmksa_cache_deinit(struct rsn_pmksa_cache * pmksa)320 void pmksa_cache_deinit(struct rsn_pmksa_cache *pmksa)
321 {
322 struct rsn_pmksa_cache_entry *entry, *prev;
323
324 if (pmksa == NULL)
325 return;
326
327 entry = pmksa->pmksa;
328 pmksa->pmksa = NULL;
329 while (entry) {
330 prev = entry;
331 entry = entry->next;
332 os_free(prev);
333 }
334 pmksa_cache_set_expiration(pmksa);
335 os_free(pmksa);
336 }
337
338
339 /**
340 * pmksa_cache_get - Fetch a PMKSA cache entry
341 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()
342 * @aa: Authenticator address or %NULL to match any
343 * @pmkid: PMKID or %NULL to match any
344 * @network_ctx: Network context or %NULL to match any
345 * @akmp: Specific AKMP to search for or 0 for any
346 * Returns: Pointer to PMKSA cache entry or %NULL if no match was found
347 */
pmksa_cache_get(struct rsn_pmksa_cache * pmksa,const u8 * aa,const u8 * pmkid,const void * network_ctx,int akmp)348 struct rsn_pmksa_cache_entry * pmksa_cache_get(struct rsn_pmksa_cache *pmksa,
349 const u8 *aa, const u8 *pmkid,
350 const void *network_ctx,
351 int akmp)
352 {
353 struct rsn_pmksa_cache_entry *entry = pmksa->pmksa;
354 while (entry) {
355 if ((aa == NULL || os_memcmp(entry->aa, aa, ETH_ALEN) == 0) &&
356 (pmkid == NULL ||
357 os_memcmp(entry->pmkid, pmkid, PMKID_LEN) == 0) &&
358 (!akmp || akmp == entry->akmp) &&
359 (network_ctx == NULL || network_ctx == entry->network_ctx))
360 return entry;
361 entry = entry->next;
362 }
363 return NULL;
364 }
365
366
367 static struct rsn_pmksa_cache_entry *
pmksa_cache_clone_entry(struct rsn_pmksa_cache * pmksa,const struct rsn_pmksa_cache_entry * old_entry,const u8 * aa)368 pmksa_cache_clone_entry(struct rsn_pmksa_cache *pmksa,
369 const struct rsn_pmksa_cache_entry *old_entry,
370 const u8 *aa)
371 {
372 struct rsn_pmksa_cache_entry *new_entry;
373 os_time_t old_expiration = old_entry->expiration;
374
375 new_entry = pmksa_cache_add(pmksa, old_entry->pmk, old_entry->pmk_len,
376 NULL, NULL, 0,
377 aa, pmksa->sm->own_addr,
378 old_entry->network_ctx, old_entry->akmp,
379 old_entry->fils_cache_id_set ?
380 old_entry->fils_cache_id : NULL);
381 if (new_entry == NULL)
382 return NULL;
383
384 /* TODO: reorder entries based on expiration time? */
385 new_entry->expiration = old_expiration;
386 new_entry->opportunistic = 1;
387
388 return new_entry;
389 }
390
391
392 /**
393 * pmksa_cache_get_opportunistic - Try to get an opportunistic PMKSA entry
394 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()
395 * @network_ctx: Network configuration context
396 * @aa: Authenticator address for the new AP
397 * @akmp: Specific AKMP to search for or 0 for any
398 * Returns: Pointer to a new PMKSA cache entry or %NULL if not available
399 *
400 * Try to create a new PMKSA cache entry opportunistically by guessing that the
401 * new AP is sharing the same PMK as another AP that has the same SSID and has
402 * already an entry in PMKSA cache.
403 */
404 struct rsn_pmksa_cache_entry *
pmksa_cache_get_opportunistic(struct rsn_pmksa_cache * pmksa,void * network_ctx,const u8 * aa,int akmp)405 pmksa_cache_get_opportunistic(struct rsn_pmksa_cache *pmksa, void *network_ctx,
406 const u8 *aa, int akmp)
407 {
408 struct rsn_pmksa_cache_entry *entry = pmksa->pmksa;
409
410 wpa_printf(MSG_DEBUG, "RSN: Consider " MACSTR " for OKC", MAC2STR(aa));
411 if (network_ctx == NULL)
412 return NULL;
413 while (entry) {
414 if (entry->network_ctx == network_ctx &&
415 (!akmp || entry->akmp == akmp)) {
416 entry = pmksa_cache_clone_entry(pmksa, entry, aa);
417 if (entry) {
418 wpa_printf(MSG_DEBUG, "RSN: added "
419 "opportunistic PMKSA cache entry "
420 "for " MACSTR, MAC2STR(aa));
421 }
422 return entry;
423 }
424 entry = entry->next;
425 }
426 return NULL;
427 }
428
429
430 static struct rsn_pmksa_cache_entry *
pmksa_cache_get_fils_cache_id(struct rsn_pmksa_cache * pmksa,const void * network_ctx,const u8 * cache_id)431 pmksa_cache_get_fils_cache_id(struct rsn_pmksa_cache *pmksa,
432 const void *network_ctx, const u8 *cache_id)
433 {
434 struct rsn_pmksa_cache_entry *entry;
435
436 for (entry = pmksa->pmksa; entry; entry = entry->next) {
437 if (network_ctx == entry->network_ctx &&
438 entry->fils_cache_id_set &&
439 os_memcmp(cache_id, entry->fils_cache_id,
440 FILS_CACHE_ID_LEN) == 0)
441 return entry;
442 }
443
444 return NULL;
445 }
446
447
448 /**
449 * pmksa_cache_get_current - Get the current used PMKSA entry
450 * @sm: Pointer to WPA state machine data from wpa_sm_init()
451 * Returns: Pointer to the current PMKSA cache entry or %NULL if not available
452 */
pmksa_cache_get_current(struct wpa_sm * sm)453 struct rsn_pmksa_cache_entry * pmksa_cache_get_current(struct wpa_sm *sm)
454 {
455 if (sm == NULL)
456 return NULL;
457 return sm->cur_pmksa;
458 }
459
460
461 /**
462 * pmksa_cache_clear_current - Clear the current PMKSA entry selection
463 * @sm: Pointer to WPA state machine data from wpa_sm_init()
464 */
pmksa_cache_clear_current(struct wpa_sm * sm)465 void pmksa_cache_clear_current(struct wpa_sm *sm)
466 {
467 if (sm == NULL)
468 return;
469 sm->cur_pmksa = NULL;
470 }
471
472
473 /**
474 * pmksa_cache_set_current - Set the current PMKSA entry selection
475 * @sm: Pointer to WPA state machine data from wpa_sm_init()
476 * @pmkid: PMKID for selecting PMKSA or %NULL if not used
477 * @bssid: BSSID for PMKSA or %NULL if not used
478 * @network_ctx: Network configuration context
479 * @try_opportunistic: Whether to allow opportunistic PMKSA caching
480 * @fils_cache_id: Pointer to FILS Cache Identifier or %NULL if not used
481 * Returns: 0 if PMKSA was found or -1 if no matching entry was found
482 */
pmksa_cache_set_current(struct wpa_sm * sm,const u8 * pmkid,const u8 * bssid,void * network_ctx,int try_opportunistic,const u8 * fils_cache_id,int akmp)483 int pmksa_cache_set_current(struct wpa_sm *sm, const u8 *pmkid,
484 const u8 *bssid, void *network_ctx,
485 int try_opportunistic, const u8 *fils_cache_id,
486 int akmp)
487 {
488 struct rsn_pmksa_cache *pmksa = sm->pmksa;
489 wpa_printf(MSG_DEBUG, "RSN: PMKSA cache search - network_ctx=%p "
490 "try_opportunistic=%d akmp=0x%x",
491 network_ctx, try_opportunistic, akmp);
492 if (pmkid)
493 wpa_hexdump(MSG_DEBUG, "RSN: Search for PMKID",
494 pmkid, PMKID_LEN);
495 if (bssid)
496 wpa_printf(MSG_DEBUG, "RSN: Search for BSSID " MACSTR,
497 MAC2STR(bssid));
498 if (fils_cache_id)
499 wpa_printf(MSG_DEBUG,
500 "RSN: Search for FILS Cache Identifier %02x%02x",
501 fils_cache_id[0], fils_cache_id[1]);
502
503 sm->cur_pmksa = NULL;
504 if (pmkid)
505 sm->cur_pmksa = pmksa_cache_get(pmksa, NULL, pmkid,
506 network_ctx, akmp);
507 if (sm->cur_pmksa == NULL && bssid)
508 sm->cur_pmksa = pmksa_cache_get(pmksa, bssid, NULL,
509 network_ctx, akmp);
510 if (sm->cur_pmksa == NULL && try_opportunistic && bssid)
511 sm->cur_pmksa = pmksa_cache_get_opportunistic(pmksa,
512 network_ctx,
513 bssid, akmp);
514 if (sm->cur_pmksa == NULL && fils_cache_id)
515 sm->cur_pmksa = pmksa_cache_get_fils_cache_id(pmksa,
516 network_ctx,
517 fils_cache_id);
518 if (sm->cur_pmksa) {
519 wpa_hexdump(MSG_DEBUG, "RSN: PMKSA cache entry found - PMKID",
520 sm->cur_pmksa->pmkid, PMKID_LEN);
521 return 0;
522 }
523 wpa_printf(MSG_DEBUG, "RSN: No PMKSA cache entry found");
524 return -1;
525 }
526
527
528 /**
529 * pmksa_cache_list - Dump text list of entries in PMKSA cache
530 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_init()
531 * @buf: Buffer for the list
532 * @len: Length of the buffer
533 * Returns: number of bytes written to buffer
534 *
535 * This function is used to generate a text format representation of the
536 * current PMKSA cache contents for the ctrl_iface PMKSA command.
537 */
pmksa_cache_list(struct rsn_pmksa_cache * pmksa,char * buf,size_t len)538 int pmksa_cache_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len)
539 {
540 int i, ret;
541 char *pos = buf;
542 struct rsn_pmksa_cache_entry *entry;
543 struct os_reltime now;
544 int cache_id_used = 0;
545
546 for (entry = pmksa->pmksa; entry; entry = entry->next) {
547 if (entry->fils_cache_id_set) {
548 cache_id_used = 1;
549 break;
550 }
551 }
552
553 os_get_reltime(&now);
554 ret = os_snprintf(pos, buf + len - pos,
555 "Index / AA / PMKID / expiration (in seconds) / "
556 "opportunistic%s\n",
557 cache_id_used ? " / FILS Cache Identifier" : "");
558 if (os_snprintf_error(buf + len - pos, ret))
559 return pos - buf;
560 pos += ret;
561 i = 0;
562 entry = pmksa->pmksa;
563 while (entry) {
564 i++;
565 ret = os_snprintf(pos, buf + len - pos, "%d " MACSTR " ",
566 i, MAC2STR(entry->aa));
567 if (os_snprintf_error(buf + len - pos, ret))
568 return pos - buf;
569 pos += ret;
570 pos += wpa_snprintf_hex(pos, buf + len - pos, entry->pmkid,
571 PMKID_LEN);
572 ret = os_snprintf(pos, buf + len - pos, " %d %d",
573 (int) (entry->expiration - now.sec),
574 entry->opportunistic);
575 if (os_snprintf_error(buf + len - pos, ret))
576 return pos - buf;
577 pos += ret;
578 if (entry->fils_cache_id_set) {
579 ret = os_snprintf(pos, buf + len - pos, " %02x%02x",
580 entry->fils_cache_id[0],
581 entry->fils_cache_id[1]);
582 if (os_snprintf_error(buf + len - pos, ret))
583 return pos - buf;
584 pos += ret;
585 }
586 ret = os_snprintf(pos, buf + len - pos, "\n");
587 if (os_snprintf_error(buf + len - pos, ret))
588 return pos - buf;
589 pos += ret;
590 entry = entry->next;
591 }
592 return pos - buf;
593 }
594
595
pmksa_cache_head(struct rsn_pmksa_cache * pmksa)596 struct rsn_pmksa_cache_entry * pmksa_cache_head(struct rsn_pmksa_cache *pmksa)
597 {
598 return pmksa->pmksa;
599 }
600
601
602 /**
603 * pmksa_cache_init - Initialize PMKSA cache
604 * @free_cb: Callback function to be called when a PMKSA cache entry is freed
605 * @ctx: Context pointer for free_cb function
606 * @sm: Pointer to WPA state machine data from wpa_sm_init()
607 * Returns: Pointer to PMKSA cache data or %NULL on failure
608 */
609 struct rsn_pmksa_cache *
pmksa_cache_init(void (* free_cb)(struct rsn_pmksa_cache_entry * entry,void * ctx,enum pmksa_free_reason reason),void * ctx,struct wpa_sm * sm)610 pmksa_cache_init(void (*free_cb)(struct rsn_pmksa_cache_entry *entry,
611 void *ctx, enum pmksa_free_reason reason),
612 void *ctx, struct wpa_sm *sm)
613 {
614 struct rsn_pmksa_cache *pmksa;
615
616 pmksa = os_zalloc(sizeof(*pmksa));
617 if (pmksa) {
618 pmksa->free_cb = free_cb;
619 pmksa->ctx = ctx;
620 pmksa->sm = sm;
621 }
622
623 return pmksa;
624 }
625
626 #endif /* IEEE8021X_EAPOL */
627