1 /*
2 * IEEE 802.11 RSN / WPA Authenticator
3 * Copyright (c) 2004-2015, 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 "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "utils/state_machine.h"
14 #include "utils/bitfield.h"
15 #include "common/ieee802_11_defs.h"
16 #include "crypto/aes.h"
17 #include "crypto/aes_wrap.h"
18 #include "crypto/aes_siv.h"
19 #include "crypto/crypto.h"
20 #include "crypto/sha1.h"
21 #include "crypto/sha256.h"
22 #include "crypto/random.h"
23 #include "eapol_auth/eapol_auth_sm.h"
24 #include "ap_config.h"
25 #include "ieee802_11.h"
26 #include "wpa_auth.h"
27 #include "pmksa_cache_auth.h"
28 #include "wpa_auth_i.h"
29 #include "wpa_auth_ie.h"
30
31 #define STATE_MACHINE_DATA struct wpa_state_machine
32 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
33 #define STATE_MACHINE_ADDR sm->addr
34
35
36 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
37 static int wpa_sm_step(struct wpa_state_machine *sm);
38 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
39 size_t data_len);
40 #ifdef CONFIG_FILS
41 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
42 u8 *buf, size_t buf_len, u16 *_key_data_len);
43 #endif /* CONFIG_FILS */
44 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
45 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
46 struct wpa_group *group);
47 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
48 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
49 struct wpa_group *group);
50 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
51 struct wpa_group *group);
52 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
53 const u8 *pmk, unsigned int pmk_len,
54 struct wpa_ptk *ptk);
55 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
56 struct wpa_group *group);
57 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
58 struct wpa_group *group);
59 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
60 struct wpa_group *group);
61 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos);
62
63 static const u32 eapol_key_timeout_first = 100; /* ms */
64 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
65 static const u32 eapol_key_timeout_first_group = 500; /* ms */
66
67 /* TODO: make these configurable */
68 static const int dot11RSNAConfigPMKLifetime = 43200;
69 static const int dot11RSNAConfigPMKReauthThreshold = 70;
70 static const int dot11RSNAConfigSATimeout = 60;
71
72
wpa_auth_mic_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)73 static inline int wpa_auth_mic_failure_report(
74 struct wpa_authenticator *wpa_auth, const u8 *addr)
75 {
76 if (wpa_auth->cb->mic_failure_report)
77 return wpa_auth->cb->mic_failure_report(wpa_auth->cb_ctx, addr);
78 return 0;
79 }
80
81
wpa_auth_psk_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)82 static inline void wpa_auth_psk_failure_report(
83 struct wpa_authenticator *wpa_auth, const u8 *addr)
84 {
85 if (wpa_auth->cb->psk_failure_report)
86 wpa_auth->cb->psk_failure_report(wpa_auth->cb_ctx, addr);
87 }
88
89
wpa_auth_set_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var,int value)90 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
91 const u8 *addr, wpa_eapol_variable var,
92 int value)
93 {
94 if (wpa_auth->cb->set_eapol)
95 wpa_auth->cb->set_eapol(wpa_auth->cb_ctx, addr, var, value);
96 }
97
98
wpa_auth_get_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var)99 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
100 const u8 *addr, wpa_eapol_variable var)
101 {
102 if (wpa_auth->cb->get_eapol == NULL)
103 return -1;
104 return wpa_auth->cb->get_eapol(wpa_auth->cb_ctx, addr, var);
105 }
106
107
wpa_auth_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk)108 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
109 const u8 *addr,
110 const u8 *p2p_dev_addr,
111 const u8 *prev_psk)
112 {
113 if (wpa_auth->cb->get_psk == NULL)
114 return NULL;
115 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
116 prev_psk);
117 }
118
119
wpa_auth_get_msk(struct wpa_authenticator * wpa_auth,const u8 * addr,u8 * msk,size_t * len)120 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
121 const u8 *addr, u8 *msk, size_t *len)
122 {
123 if (wpa_auth->cb->get_msk == NULL)
124 return -1;
125 return wpa_auth->cb->get_msk(wpa_auth->cb_ctx, addr, msk, len);
126 }
127
128
wpa_auth_set_key(struct wpa_authenticator * wpa_auth,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len)129 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
130 int vlan_id,
131 enum wpa_alg alg, const u8 *addr, int idx,
132 u8 *key, size_t key_len)
133 {
134 if (wpa_auth->cb->set_key == NULL)
135 return -1;
136 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
137 key, key_len);
138 }
139
140
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)141 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
142 const u8 *addr, int idx, u8 *seq)
143 {
144 if (wpa_auth->cb->get_seqnum == NULL)
145 return -1;
146 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
147 }
148
149
150 static inline int
wpa_auth_send_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * data,size_t data_len,int encrypt)151 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
152 const u8 *data, size_t data_len, int encrypt)
153 {
154 if (wpa_auth->cb->send_eapol == NULL)
155 return -1;
156 return wpa_auth->cb->send_eapol(wpa_auth->cb_ctx, addr, data, data_len,
157 encrypt);
158 }
159
160
161 #ifdef CONFIG_MESH
wpa_auth_start_ampe(struct wpa_authenticator * wpa_auth,const u8 * addr)162 static inline int wpa_auth_start_ampe(struct wpa_authenticator *wpa_auth,
163 const u8 *addr)
164 {
165 if (wpa_auth->cb->start_ampe == NULL)
166 return -1;
167 return wpa_auth->cb->start_ampe(wpa_auth->cb_ctx, addr);
168 }
169 #endif /* CONFIG_MESH */
170
171
wpa_auth_for_each_sta(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)172 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
173 int (*cb)(struct wpa_state_machine *sm, void *ctx),
174 void *cb_ctx)
175 {
176 if (wpa_auth->cb->for_each_sta == NULL)
177 return 0;
178 return wpa_auth->cb->for_each_sta(wpa_auth->cb_ctx, cb, cb_ctx);
179 }
180
181
wpa_auth_for_each_auth(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_authenticator * a,void * ctx),void * cb_ctx)182 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
183 int (*cb)(struct wpa_authenticator *a, void *ctx),
184 void *cb_ctx)
185 {
186 if (wpa_auth->cb->for_each_auth == NULL)
187 return 0;
188 return wpa_auth->cb->for_each_auth(wpa_auth->cb_ctx, cb, cb_ctx);
189 }
190
191
wpa_auth_logger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * txt)192 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
193 logger_level level, const char *txt)
194 {
195 if (wpa_auth->cb->logger == NULL)
196 return;
197 wpa_auth->cb->logger(wpa_auth->cb_ctx, addr, level, txt);
198 }
199
200
wpa_auth_vlogger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * fmt,...)201 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
202 logger_level level, const char *fmt, ...)
203 {
204 char *format;
205 int maxlen;
206 va_list ap;
207
208 if (wpa_auth->cb->logger == NULL)
209 return;
210
211 maxlen = os_strlen(fmt) + 100;
212 format = os_malloc(maxlen);
213 if (!format)
214 return;
215
216 va_start(ap, fmt);
217 vsnprintf(format, maxlen, fmt, ap);
218 va_end(ap);
219
220 wpa_auth_logger(wpa_auth, addr, level, format);
221
222 os_free(format);
223 }
224
225
wpa_sta_disconnect(struct wpa_authenticator * wpa_auth,const u8 * addr)226 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
227 const u8 *addr)
228 {
229 if (wpa_auth->cb->disconnect == NULL)
230 return;
231 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
232 wpa_auth->cb->disconnect(wpa_auth->cb_ctx, addr,
233 WLAN_REASON_PREV_AUTH_NOT_VALID);
234 }
235
236
wpa_use_aes_cmac(struct wpa_state_machine * sm)237 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
238 {
239 int ret = 0;
240 #ifdef CONFIG_IEEE80211R_AP
241 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
242 ret = 1;
243 #endif /* CONFIG_IEEE80211R_AP */
244 #ifdef CONFIG_IEEE80211W
245 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
246 ret = 1;
247 #endif /* CONFIG_IEEE80211W */
248 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
249 ret = 1;
250 return ret;
251 }
252
253
wpa_rekey_gmk(void * eloop_ctx,void * timeout_ctx)254 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
255 {
256 struct wpa_authenticator *wpa_auth = eloop_ctx;
257
258 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
259 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
260 "initialization.");
261 } else {
262 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
263 wpa_hexdump_key(MSG_DEBUG, "GMK",
264 wpa_auth->group->GMK, WPA_GMK_LEN);
265 }
266
267 if (wpa_auth->conf.wpa_gmk_rekey) {
268 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
269 wpa_rekey_gmk, wpa_auth, NULL);
270 }
271 }
272
273
wpa_rekey_gtk(void * eloop_ctx,void * timeout_ctx)274 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
275 {
276 struct wpa_authenticator *wpa_auth = eloop_ctx;
277 struct wpa_group *group, *next;
278
279 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
280 group = wpa_auth->group;
281 while (group) {
282 wpa_group_get(wpa_auth, group);
283
284 group->GTKReKey = TRUE;
285 do {
286 group->changed = FALSE;
287 wpa_group_sm_step(wpa_auth, group);
288 } while (group->changed);
289
290 next = group->next;
291 wpa_group_put(wpa_auth, group);
292 group = next;
293 }
294
295 if (wpa_auth->conf.wpa_group_rekey) {
296 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
297 0, wpa_rekey_gtk, wpa_auth, NULL);
298 }
299 }
300
301
wpa_rekey_ptk(void * eloop_ctx,void * timeout_ctx)302 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
303 {
304 struct wpa_authenticator *wpa_auth = eloop_ctx;
305 struct wpa_state_machine *sm = timeout_ctx;
306
307 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
308 wpa_request_new_ptk(sm);
309 wpa_sm_step(sm);
310 }
311
312
wpa_auth_pmksa_clear_cb(struct wpa_state_machine * sm,void * ctx)313 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
314 {
315 if (sm->pmksa == ctx)
316 sm->pmksa = NULL;
317 return 0;
318 }
319
320
wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx)321 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
322 void *ctx)
323 {
324 struct wpa_authenticator *wpa_auth = ctx;
325 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
326 }
327
328
wpa_group_init_gmk_and_counter(struct wpa_authenticator * wpa_auth,struct wpa_group * group)329 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
330 struct wpa_group *group)
331 {
332 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
333 u8 rkey[32];
334 unsigned long ptr;
335
336 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
337 return -1;
338 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
339
340 /*
341 * Counter = PRF-256(Random number, "Init Counter",
342 * Local MAC Address || Time)
343 */
344 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
345 wpa_get_ntp_timestamp(buf + ETH_ALEN);
346 ptr = (unsigned long) group;
347 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
348 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
349 return -1;
350
351 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
352 group->Counter, WPA_NONCE_LEN) < 0)
353 return -1;
354 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
355 group->Counter, WPA_NONCE_LEN);
356
357 return 0;
358 }
359
360
wpa_group_init(struct wpa_authenticator * wpa_auth,int vlan_id,int delay_init)361 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
362 int vlan_id, int delay_init)
363 {
364 struct wpa_group *group;
365
366 group = os_zalloc(sizeof(struct wpa_group));
367 if (group == NULL)
368 return NULL;
369
370 group->GTKAuthenticator = TRUE;
371 group->vlan_id = vlan_id;
372 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
373
374 if (random_pool_ready() != 1) {
375 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
376 "for secure operations - update keys later when "
377 "the first station connects");
378 }
379
380 /*
381 * Set initial GMK/Counter value here. The actual values that will be
382 * used in negotiations will be set once the first station tries to
383 * connect. This allows more time for collecting additional randomness
384 * on embedded devices.
385 */
386 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
387 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
388 "initialization.");
389 os_free(group);
390 return NULL;
391 }
392
393 group->GInit = TRUE;
394 if (delay_init) {
395 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
396 "until Beacon frames have been configured");
397 /* Initialization is completed in wpa_init_keys(). */
398 } else {
399 wpa_group_sm_step(wpa_auth, group);
400 group->GInit = FALSE;
401 wpa_group_sm_step(wpa_auth, group);
402 }
403
404 return group;
405 }
406
407
408 /**
409 * wpa_init - Initialize WPA authenticator
410 * @addr: Authenticator address
411 * @conf: Configuration for WPA authenticator
412 * @cb: Callback functions for WPA authenticator
413 * Returns: Pointer to WPA authenticator data or %NULL on failure
414 */
wpa_init(const u8 * addr,struct wpa_auth_config * conf,const struct wpa_auth_callbacks * cb,void * cb_ctx)415 struct wpa_authenticator * wpa_init(const u8 *addr,
416 struct wpa_auth_config *conf,
417 const struct wpa_auth_callbacks *cb,
418 void *cb_ctx)
419 {
420 struct wpa_authenticator *wpa_auth;
421
422 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
423 if (wpa_auth == NULL)
424 return NULL;
425 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
426 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
427 wpa_auth->cb = cb;
428 wpa_auth->cb_ctx = cb_ctx;
429
430 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
431 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
432 os_free(wpa_auth);
433 return NULL;
434 }
435
436 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
437 if (wpa_auth->group == NULL) {
438 os_free(wpa_auth->wpa_ie);
439 os_free(wpa_auth);
440 return NULL;
441 }
442
443 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
444 wpa_auth);
445 if (wpa_auth->pmksa == NULL) {
446 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
447 os_free(wpa_auth->group);
448 os_free(wpa_auth->wpa_ie);
449 os_free(wpa_auth);
450 return NULL;
451 }
452
453 #ifdef CONFIG_IEEE80211R_AP
454 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
455 if (wpa_auth->ft_pmk_cache == NULL) {
456 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
457 os_free(wpa_auth->group);
458 os_free(wpa_auth->wpa_ie);
459 pmksa_cache_auth_deinit(wpa_auth->pmksa);
460 os_free(wpa_auth);
461 return NULL;
462 }
463 #endif /* CONFIG_IEEE80211R_AP */
464
465 if (wpa_auth->conf.wpa_gmk_rekey) {
466 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
467 wpa_rekey_gmk, wpa_auth, NULL);
468 }
469
470 if (wpa_auth->conf.wpa_group_rekey) {
471 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
472 wpa_rekey_gtk, wpa_auth, NULL);
473 }
474
475 #ifdef CONFIG_P2P
476 if (WPA_GET_BE32(conf->ip_addr_start)) {
477 int count = WPA_GET_BE32(conf->ip_addr_end) -
478 WPA_GET_BE32(conf->ip_addr_start) + 1;
479 if (count > 1000)
480 count = 1000;
481 if (count > 0)
482 wpa_auth->ip_pool = bitfield_alloc(count);
483 }
484 #endif /* CONFIG_P2P */
485
486 return wpa_auth;
487 }
488
489
wpa_init_keys(struct wpa_authenticator * wpa_auth)490 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
491 {
492 struct wpa_group *group = wpa_auth->group;
493
494 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
495 "keys");
496 wpa_group_sm_step(wpa_auth, group);
497 group->GInit = FALSE;
498 wpa_group_sm_step(wpa_auth, group);
499 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
500 return -1;
501 return 0;
502 }
503
504
505 /**
506 * wpa_deinit - Deinitialize WPA authenticator
507 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
508 */
wpa_deinit(struct wpa_authenticator * wpa_auth)509 void wpa_deinit(struct wpa_authenticator *wpa_auth)
510 {
511 struct wpa_group *group, *prev;
512
513 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
514 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
515
516 pmksa_cache_auth_deinit(wpa_auth->pmksa);
517
518 #ifdef CONFIG_IEEE80211R_AP
519 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
520 wpa_auth->ft_pmk_cache = NULL;
521 #endif /* CONFIG_IEEE80211R_AP */
522
523 #ifdef CONFIG_P2P
524 bitfield_free(wpa_auth->ip_pool);
525 #endif /* CONFIG_P2P */
526
527
528 os_free(wpa_auth->wpa_ie);
529
530 group = wpa_auth->group;
531 while (group) {
532 prev = group;
533 group = group->next;
534 os_free(prev);
535 }
536
537 os_free(wpa_auth);
538 }
539
540
541 /**
542 * wpa_reconfig - Update WPA authenticator configuration
543 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
544 * @conf: Configuration for WPA authenticator
545 */
wpa_reconfig(struct wpa_authenticator * wpa_auth,struct wpa_auth_config * conf)546 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
547 struct wpa_auth_config *conf)
548 {
549 struct wpa_group *group;
550 if (wpa_auth == NULL)
551 return 0;
552
553 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
554 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
555 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
556 return -1;
557 }
558
559 /*
560 * Reinitialize GTK to make sure it is suitable for the new
561 * configuration.
562 */
563 group = wpa_auth->group;
564 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
565 group->GInit = TRUE;
566 wpa_group_sm_step(wpa_auth, group);
567 group->GInit = FALSE;
568 wpa_group_sm_step(wpa_auth, group);
569
570 return 0;
571 }
572
573
574 struct wpa_state_machine *
wpa_auth_sta_init(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr)575 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
576 const u8 *p2p_dev_addr)
577 {
578 struct wpa_state_machine *sm;
579
580 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
581 return NULL;
582
583 sm = os_zalloc(sizeof(struct wpa_state_machine));
584 if (sm == NULL)
585 return NULL;
586 os_memcpy(sm->addr, addr, ETH_ALEN);
587 if (p2p_dev_addr)
588 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
589
590 sm->wpa_auth = wpa_auth;
591 sm->group = wpa_auth->group;
592 wpa_group_get(sm->wpa_auth, sm->group);
593
594 return sm;
595 }
596
597
wpa_auth_sta_associated(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm)598 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
599 struct wpa_state_machine *sm)
600 {
601 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
602 return -1;
603
604 #ifdef CONFIG_IEEE80211R_AP
605 if (sm->ft_completed) {
606 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
607 "FT authentication already completed - do not "
608 "start 4-way handshake");
609 /* Go to PTKINITDONE state to allow GTK rekeying */
610 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
611 sm->Pair = TRUE;
612 return 0;
613 }
614 #endif /* CONFIG_IEEE80211R_AP */
615
616 #ifdef CONFIG_FILS
617 if (sm->fils_completed) {
618 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
619 "FILS authentication already completed - do not start 4-way handshake");
620 /* Go to PTKINITDONE state to allow GTK rekeying */
621 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
622 sm->Pair = TRUE;
623 return 0;
624 }
625 #endif /* CONFIG_FILS */
626
627 if (sm->started) {
628 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
629 sm->ReAuthenticationRequest = TRUE;
630 return wpa_sm_step(sm);
631 }
632
633 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
634 "start authentication");
635 sm->started = 1;
636
637 sm->Init = TRUE;
638 if (wpa_sm_step(sm) == 1)
639 return 1; /* should not really happen */
640 sm->Init = FALSE;
641 sm->AuthenticationRequest = TRUE;
642 return wpa_sm_step(sm);
643 }
644
645
wpa_auth_sta_no_wpa(struct wpa_state_machine * sm)646 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
647 {
648 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
649 * reassociates back to the same AP while the previous entry for the
650 * STA has not yet been removed. */
651 if (sm == NULL)
652 return;
653
654 sm->wpa_key_mgmt = 0;
655 }
656
657
wpa_free_sta_sm(struct wpa_state_machine * sm)658 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
659 {
660 #ifdef CONFIG_P2P
661 if (WPA_GET_BE32(sm->ip_addr)) {
662 u32 start;
663 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
664 "address %u.%u.%u.%u from " MACSTR,
665 sm->ip_addr[0], sm->ip_addr[1],
666 sm->ip_addr[2], sm->ip_addr[3],
667 MAC2STR(sm->addr));
668 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
669 bitfield_clear(sm->wpa_auth->ip_pool,
670 WPA_GET_BE32(sm->ip_addr) - start);
671 }
672 #endif /* CONFIG_P2P */
673 if (sm->GUpdateStationKeys) {
674 sm->group->GKeyDoneStations--;
675 sm->GUpdateStationKeys = FALSE;
676 }
677 #ifdef CONFIG_IEEE80211R_AP
678 os_free(sm->assoc_resp_ftie);
679 wpabuf_free(sm->ft_pending_req_ies);
680 #endif /* CONFIG_IEEE80211R_AP */
681 os_free(sm->last_rx_eapol_key);
682 os_free(sm->wpa_ie);
683 wpa_group_put(sm->wpa_auth, sm->group);
684 os_free(sm);
685 }
686
687
wpa_auth_sta_deinit(struct wpa_state_machine * sm)688 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
689 {
690 if (sm == NULL)
691 return;
692
693 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
694 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
695 "strict rekeying - force GTK rekey since STA "
696 "is leaving");
697 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
698 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
699 NULL);
700 }
701
702 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
703 sm->pending_1_of_4_timeout = 0;
704 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
705 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
706 if (sm->in_step_loop) {
707 /* Must not free state machine while wpa_sm_step() is running.
708 * Freeing will be completed in the end of wpa_sm_step(). */
709 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
710 "machine deinit for " MACSTR, MAC2STR(sm->addr));
711 sm->pending_deinit = 1;
712 } else
713 wpa_free_sta_sm(sm);
714 }
715
716
wpa_request_new_ptk(struct wpa_state_machine * sm)717 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
718 {
719 if (sm == NULL)
720 return;
721
722 sm->PTKRequest = TRUE;
723 sm->PTK_valid = 0;
724 }
725
726
wpa_replay_counter_valid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)727 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
728 const u8 *replay_counter)
729 {
730 int i;
731 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
732 if (!ctr[i].valid)
733 break;
734 if (os_memcmp(replay_counter, ctr[i].counter,
735 WPA_REPLAY_COUNTER_LEN) == 0)
736 return 1;
737 }
738 return 0;
739 }
740
741
wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)742 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
743 const u8 *replay_counter)
744 {
745 int i;
746 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
747 if (ctr[i].valid &&
748 (replay_counter == NULL ||
749 os_memcmp(replay_counter, ctr[i].counter,
750 WPA_REPLAY_COUNTER_LEN) == 0))
751 ctr[i].valid = FALSE;
752 }
753 }
754
755
756 #ifdef CONFIG_IEEE80211R_AP
ft_check_msg_2_of_4(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,struct wpa_eapol_ie_parse * kde)757 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
758 struct wpa_state_machine *sm,
759 struct wpa_eapol_ie_parse *kde)
760 {
761 struct wpa_ie_data ie;
762 struct rsn_mdie *mdie;
763
764 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
765 ie.num_pmkid != 1 || ie.pmkid == NULL) {
766 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
767 "FT 4-way handshake message 2/4");
768 return -1;
769 }
770
771 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
772 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
773 sm->sup_pmk_r1_name, PMKID_LEN);
774
775 if (!kde->mdie || !kde->ftie) {
776 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
777 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
778 return -1;
779 }
780
781 mdie = (struct rsn_mdie *) (kde->mdie + 2);
782 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
783 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
784 MOBILITY_DOMAIN_ID_LEN) != 0) {
785 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
786 return -1;
787 }
788
789 if (sm->assoc_resp_ftie &&
790 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
791 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
792 2 + sm->assoc_resp_ftie[1]) != 0)) {
793 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
794 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
795 kde->ftie, kde->ftie_len);
796 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
797 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
798 return -1;
799 }
800
801 return 0;
802 }
803 #endif /* CONFIG_IEEE80211R_AP */
804
805
wpa_receive_error_report(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int group)806 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
807 struct wpa_state_machine *sm, int group)
808 {
809 /* Supplicant reported a Michael MIC error */
810 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
811 "received EAPOL-Key Error Request "
812 "(STA detected Michael MIC failure (group=%d))",
813 group);
814
815 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
816 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
817 "ignore Michael MIC failure report since "
818 "group cipher is not TKIP");
819 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
820 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
821 "ignore Michael MIC failure report since "
822 "pairwise cipher is not TKIP");
823 } else {
824 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
825 return 1; /* STA entry was removed */
826 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
827 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
828 }
829
830 /*
831 * Error report is not a request for a new key handshake, but since
832 * Authenticator may do it, let's change the keys now anyway.
833 */
834 wpa_request_new_ptk(sm);
835 return 0;
836 }
837
838
wpa_try_alt_snonce(struct wpa_state_machine * sm,u8 * data,size_t data_len)839 static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data,
840 size_t data_len)
841 {
842 struct wpa_ptk PTK;
843 int ok = 0;
844 const u8 *pmk = NULL;
845 unsigned int pmk_len;
846
847 os_memset(&PTK, 0, sizeof(PTK));
848 for (;;) {
849 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
850 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
851 sm->p2p_dev_addr, pmk);
852 if (pmk == NULL)
853 break;
854 pmk_len = PMK_LEN;
855 } else {
856 pmk = sm->PMK;
857 pmk_len = sm->pmk_len;
858 }
859
860 if (wpa_derive_ptk(sm, sm->alt_SNonce, pmk, pmk_len, &PTK) < 0)
861 break;
862
863 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, data, data_len)
864 == 0) {
865 ok = 1;
866 break;
867 }
868
869 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
870 break;
871 }
872
873 if (!ok) {
874 wpa_printf(MSG_DEBUG,
875 "WPA: Earlier SNonce did not result in matching MIC");
876 return -1;
877 }
878
879 wpa_printf(MSG_DEBUG,
880 "WPA: Earlier SNonce resulted in matching MIC");
881 sm->alt_snonce_valid = 0;
882 os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN);
883 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
884 sm->PTK_valid = TRUE;
885
886 return 0;
887 }
888
889
wpa_receive(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,u8 * data,size_t data_len)890 void wpa_receive(struct wpa_authenticator *wpa_auth,
891 struct wpa_state_machine *sm,
892 u8 *data, size_t data_len)
893 {
894 struct ieee802_1x_hdr *hdr;
895 struct wpa_eapol_key *key;
896 u16 key_info, key_data_length;
897 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
898 SMK_M1, SMK_M3, SMK_ERROR } msg;
899 char *msgtxt;
900 struct wpa_eapol_ie_parse kde;
901 const u8 *key_data;
902 size_t keyhdrlen, mic_len;
903 u8 *mic;
904
905 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
906 return;
907 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL data", data, data_len);
908
909 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
910 keyhdrlen = sizeof(*key) + mic_len + 2;
911
912 if (data_len < sizeof(*hdr) + keyhdrlen) {
913 wpa_printf(MSG_DEBUG, "WPA: Ignore too short EAPOL-Key frame");
914 return;
915 }
916
917 hdr = (struct ieee802_1x_hdr *) data;
918 key = (struct wpa_eapol_key *) (hdr + 1);
919 mic = (u8 *) (key + 1);
920 key_info = WPA_GET_BE16(key->key_info);
921 key_data = mic + mic_len + 2;
922 key_data_length = WPA_GET_BE16(mic + mic_len);
923 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
924 " key_info=0x%x type=%u mic_len=%u key_data_length=%u",
925 MAC2STR(sm->addr), key_info, key->type,
926 (unsigned int) mic_len, key_data_length);
927 wpa_hexdump(MSG_MSGDUMP,
928 "WPA: EAPOL-Key header (ending before Key MIC)",
929 key, sizeof(*key));
930 wpa_hexdump(MSG_MSGDUMP, "WPA: EAPOL-Key Key MIC",
931 mic, mic_len);
932 if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) {
933 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
934 "key_data overflow (%d > %lu)",
935 key_data_length,
936 (unsigned long) (data_len - sizeof(*hdr) -
937 keyhdrlen));
938 return;
939 }
940
941 if (sm->wpa == WPA_VERSION_WPA2) {
942 if (key->type == EAPOL_KEY_TYPE_WPA) {
943 /*
944 * Some deployed station implementations seem to send
945 * msg 4/4 with incorrect type value in WPA2 mode.
946 */
947 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
948 "with unexpected WPA type in RSN mode");
949 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
950 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
951 "unexpected type %d in RSN mode",
952 key->type);
953 return;
954 }
955 } else {
956 if (key->type != EAPOL_KEY_TYPE_WPA) {
957 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
958 "unexpected type %d in WPA mode",
959 key->type);
960 return;
961 }
962 }
963
964 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
965 WPA_NONCE_LEN);
966 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
967 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
968
969 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
970 * are set */
971
972 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
973 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
974 if (key_info & WPA_KEY_INFO_ERROR) {
975 msg = SMK_ERROR;
976 msgtxt = "SMK Error";
977 } else {
978 msg = SMK_M1;
979 msgtxt = "SMK M1";
980 }
981 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
982 msg = SMK_M3;
983 msgtxt = "SMK M3";
984 } else if (key_info & WPA_KEY_INFO_REQUEST) {
985 msg = REQUEST;
986 msgtxt = "Request";
987 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
988 msg = GROUP_2;
989 msgtxt = "2/2 Group";
990 } else if (key_data_length == 0 ||
991 (mic_len == 0 && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA) &&
992 key_data_length == AES_BLOCK_SIZE)) {
993 msg = PAIRWISE_4;
994 msgtxt = "4/4 Pairwise";
995 } else {
996 msg = PAIRWISE_2;
997 msgtxt = "2/4 Pairwise";
998 }
999
1000 /* TODO: key_info type validation for PeerKey */
1001 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
1002 msg == GROUP_2) {
1003 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1004 if (sm->pairwise == WPA_CIPHER_CCMP ||
1005 sm->pairwise == WPA_CIPHER_GCMP) {
1006 if (wpa_use_aes_cmac(sm) &&
1007 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN &&
1008 !wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) &&
1009 !wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1010 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1011 wpa_auth_logger(wpa_auth, sm->addr,
1012 LOGGER_WARNING,
1013 "advertised support for "
1014 "AES-128-CMAC, but did not "
1015 "use it");
1016 return;
1017 }
1018
1019 if (!wpa_use_aes_cmac(sm) &&
1020 !wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1021 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1022 wpa_auth_logger(wpa_auth, sm->addr,
1023 LOGGER_WARNING,
1024 "did not use HMAC-SHA1-AES "
1025 "with CCMP/GCMP");
1026 return;
1027 }
1028 }
1029
1030 if ((wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1031 wpa_key_mgmt_fils(sm->wpa_key_mgmt)) &&
1032 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
1033 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1034 "did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases");
1035 return;
1036 }
1037 }
1038
1039 if (key_info & WPA_KEY_INFO_REQUEST) {
1040 if (sm->req_replay_counter_used &&
1041 os_memcmp(key->replay_counter, sm->req_replay_counter,
1042 WPA_REPLAY_COUNTER_LEN) <= 0) {
1043 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1044 "received EAPOL-Key request with "
1045 "replayed counter");
1046 return;
1047 }
1048 }
1049
1050 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
1051 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
1052 int i;
1053
1054 if (msg == PAIRWISE_2 &&
1055 wpa_replay_counter_valid(sm->prev_key_replay,
1056 key->replay_counter) &&
1057 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1058 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
1059 {
1060 /*
1061 * Some supplicant implementations (e.g., Windows XP
1062 * WZC) update SNonce for each EAPOL-Key 2/4. This
1063 * breaks the workaround on accepting any of the
1064 * pending requests, so allow the SNonce to be updated
1065 * even if we have already sent out EAPOL-Key 3/4.
1066 */
1067 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1068 "Process SNonce update from STA "
1069 "based on retransmitted EAPOL-Key "
1070 "1/4");
1071 sm->update_snonce = 1;
1072 os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN);
1073 sm->alt_snonce_valid = TRUE;
1074 os_memcpy(sm->alt_replay_counter,
1075 sm->key_replay[0].counter,
1076 WPA_REPLAY_COUNTER_LEN);
1077 goto continue_processing;
1078 }
1079
1080 if (msg == PAIRWISE_4 && sm->alt_snonce_valid &&
1081 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1082 os_memcmp(key->replay_counter, sm->alt_replay_counter,
1083 WPA_REPLAY_COUNTER_LEN) == 0) {
1084 /*
1085 * Supplicant may still be using the old SNonce since
1086 * there was two EAPOL-Key 2/4 messages and they had
1087 * different SNonce values.
1088 */
1089 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1090 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4");
1091 goto continue_processing;
1092 }
1093
1094 if (msg == PAIRWISE_2 &&
1095 wpa_replay_counter_valid(sm->prev_key_replay,
1096 key->replay_counter) &&
1097 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
1098 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1099 "ignore retransmitted EAPOL-Key %s - "
1100 "SNonce did not change", msgtxt);
1101 } else {
1102 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1103 "received EAPOL-Key %s with "
1104 "unexpected replay counter", msgtxt);
1105 }
1106 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
1107 if (!sm->key_replay[i].valid)
1108 break;
1109 wpa_hexdump(MSG_DEBUG, "pending replay counter",
1110 sm->key_replay[i].counter,
1111 WPA_REPLAY_COUNTER_LEN);
1112 }
1113 wpa_hexdump(MSG_DEBUG, "received replay counter",
1114 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1115 return;
1116 }
1117
1118 continue_processing:
1119 #ifdef CONFIG_FILS
1120 if (sm->wpa == WPA_VERSION_WPA2 && mic_len == 0 &&
1121 !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1122 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1123 "WPA: Encr Key Data bit not set even though AEAD cipher is supposed to be used - drop frame");
1124 return;
1125 }
1126 #endif /* CONFIG_FILS */
1127
1128 switch (msg) {
1129 case PAIRWISE_2:
1130 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
1131 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
1132 (!sm->update_snonce ||
1133 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
1134 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1135 "received EAPOL-Key msg 2/4 in "
1136 "invalid state (%d) - dropped",
1137 sm->wpa_ptk_state);
1138 return;
1139 }
1140 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
1141 if (sm->group->reject_4way_hs_for_entropy) {
1142 /*
1143 * The system did not have enough entropy to generate
1144 * strong random numbers. Reject the first 4-way
1145 * handshake(s) and collect some entropy based on the
1146 * information from it. Once enough entropy is
1147 * available, the next atempt will trigger GMK/Key
1148 * Counter update and the station will be allowed to
1149 * continue.
1150 */
1151 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
1152 "collect more entropy for random number "
1153 "generation");
1154 random_mark_pool_ready();
1155 wpa_sta_disconnect(wpa_auth, sm->addr);
1156 return;
1157 }
1158 break;
1159 case PAIRWISE_4:
1160 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1161 !sm->PTK_valid) {
1162 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1163 "received EAPOL-Key msg 4/4 in "
1164 "invalid state (%d) - dropped",
1165 sm->wpa_ptk_state);
1166 return;
1167 }
1168 break;
1169 case GROUP_2:
1170 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1171 || !sm->PTK_valid) {
1172 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1173 "received EAPOL-Key msg 2/2 in "
1174 "invalid state (%d) - dropped",
1175 sm->wpa_ptk_group_state);
1176 return;
1177 }
1178 break;
1179 #ifdef CONFIG_PEERKEY
1180 case SMK_M1:
1181 case SMK_M3:
1182 case SMK_ERROR:
1183 if (!wpa_auth->conf.peerkey) {
1184 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1185 "PeerKey use disabled - ignoring message");
1186 return;
1187 }
1188 if (!sm->PTK_valid) {
1189 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1190 "received EAPOL-Key msg SMK in "
1191 "invalid state - dropped");
1192 return;
1193 }
1194 break;
1195 #else /* CONFIG_PEERKEY */
1196 case SMK_M1:
1197 case SMK_M3:
1198 case SMK_ERROR:
1199 return; /* STSL disabled - ignore SMK messages */
1200 #endif /* CONFIG_PEERKEY */
1201 case REQUEST:
1202 break;
1203 }
1204
1205 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1206 "received EAPOL-Key frame (%s)", msgtxt);
1207
1208 if (key_info & WPA_KEY_INFO_ACK) {
1209 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1210 "received invalid EAPOL-Key: Key Ack set");
1211 return;
1212 }
1213
1214 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1215 !(key_info & WPA_KEY_INFO_MIC)) {
1216 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1217 "received invalid EAPOL-Key: Key MIC not set");
1218 return;
1219 }
1220
1221 #ifdef CONFIG_FILS
1222 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1223 (key_info & WPA_KEY_INFO_MIC)) {
1224 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1225 "received invalid EAPOL-Key: Key MIC set");
1226 return;
1227 }
1228 #endif /* CONFIG_FILS */
1229
1230 sm->MICVerified = FALSE;
1231 if (sm->PTK_valid && !sm->update_snonce) {
1232 if (mic_len &&
1233 wpa_verify_key_mic(sm->wpa_key_mgmt, &sm->PTK, data,
1234 data_len) &&
1235 (msg != PAIRWISE_4 || !sm->alt_snonce_valid ||
1236 wpa_try_alt_snonce(sm, data, data_len))) {
1237 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1238 "received EAPOL-Key with invalid MIC");
1239 return;
1240 }
1241 #ifdef CONFIG_FILS
1242 if (!mic_len &&
1243 wpa_aead_decrypt(sm, &sm->PTK, data, data_len,
1244 &key_data_length) < 0) {
1245 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1246 "received EAPOL-Key with invalid MIC");
1247 return;
1248 }
1249 #endif /* CONFIG_FILS */
1250 sm->MICVerified = TRUE;
1251 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1252 sm->pending_1_of_4_timeout = 0;
1253 }
1254
1255 if (key_info & WPA_KEY_INFO_REQUEST) {
1256 if (sm->MICVerified) {
1257 sm->req_replay_counter_used = 1;
1258 os_memcpy(sm->req_replay_counter, key->replay_counter,
1259 WPA_REPLAY_COUNTER_LEN);
1260 } else {
1261 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1262 "received EAPOL-Key request with "
1263 "invalid MIC");
1264 return;
1265 }
1266
1267 /*
1268 * TODO: should decrypt key data field if encryption was used;
1269 * even though MAC address KDE is not normally encrypted,
1270 * supplicant is allowed to encrypt it.
1271 */
1272 if (msg == SMK_ERROR) {
1273 #ifdef CONFIG_PEERKEY
1274 wpa_smk_error(wpa_auth, sm, key_data, key_data_length);
1275 #endif /* CONFIG_PEERKEY */
1276 return;
1277 } else if (key_info & WPA_KEY_INFO_ERROR) {
1278 if (wpa_receive_error_report(
1279 wpa_auth, sm,
1280 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1281 return; /* STA entry was removed */
1282 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1283 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1284 "received EAPOL-Key Request for new "
1285 "4-Way Handshake");
1286 wpa_request_new_ptk(sm);
1287 #ifdef CONFIG_PEERKEY
1288 } else if (msg == SMK_M1) {
1289 wpa_smk_m1(wpa_auth, sm, key, key_data,
1290 key_data_length);
1291 #endif /* CONFIG_PEERKEY */
1292 } else if (key_data_length > 0 &&
1293 wpa_parse_kde_ies(key_data, key_data_length,
1294 &kde) == 0 &&
1295 kde.mac_addr) {
1296 } else {
1297 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1298 "received EAPOL-Key Request for GTK "
1299 "rekeying");
1300 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1301 wpa_rekey_gtk(wpa_auth, NULL);
1302 }
1303 } else {
1304 /* Do not allow the same key replay counter to be reused. */
1305 wpa_replay_counter_mark_invalid(sm->key_replay,
1306 key->replay_counter);
1307
1308 if (msg == PAIRWISE_2) {
1309 /*
1310 * Maintain a copy of the pending EAPOL-Key frames in
1311 * case the EAPOL-Key frame was retransmitted. This is
1312 * needed to allow EAPOL-Key msg 2/4 reply to another
1313 * pending msg 1/4 to update the SNonce to work around
1314 * unexpected supplicant behavior.
1315 */
1316 os_memcpy(sm->prev_key_replay, sm->key_replay,
1317 sizeof(sm->key_replay));
1318 } else {
1319 os_memset(sm->prev_key_replay, 0,
1320 sizeof(sm->prev_key_replay));
1321 }
1322
1323 /*
1324 * Make sure old valid counters are not accepted anymore and
1325 * do not get copied again.
1326 */
1327 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1328 }
1329
1330 #ifdef CONFIG_PEERKEY
1331 if (msg == SMK_M3) {
1332 wpa_smk_m3(wpa_auth, sm, key, key_data, key_data_length);
1333 return;
1334 }
1335 #endif /* CONFIG_PEERKEY */
1336
1337 os_free(sm->last_rx_eapol_key);
1338 sm->last_rx_eapol_key = os_malloc(data_len);
1339 if (sm->last_rx_eapol_key == NULL)
1340 return;
1341 os_memcpy(sm->last_rx_eapol_key, data, data_len);
1342 sm->last_rx_eapol_key_len = data_len;
1343
1344 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1345 sm->EAPOLKeyReceived = TRUE;
1346 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1347 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1348 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1349 wpa_sm_step(sm);
1350 }
1351
1352
wpa_gmk_to_gtk(const u8 * gmk,const char * label,const u8 * addr,const u8 * gnonce,u8 * gtk,size_t gtk_len)1353 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1354 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1355 {
1356 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1357 u8 *pos;
1358 int ret = 0;
1359
1360 /* GTK = PRF-X(GMK, "Group key expansion",
1361 * AA || GNonce || Time || random data)
1362 * The example described in the IEEE 802.11 standard uses only AA and
1363 * GNonce as inputs here. Add some more entropy since this derivation
1364 * is done only at the Authenticator and as such, does not need to be
1365 * exactly same.
1366 */
1367 os_memcpy(data, addr, ETH_ALEN);
1368 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1369 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1370 wpa_get_ntp_timestamp(pos);
1371 pos += 8;
1372 if (random_get_bytes(pos, 16) < 0)
1373 ret = -1;
1374
1375 #ifdef CONFIG_IEEE80211W
1376 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1377 #else /* CONFIG_IEEE80211W */
1378 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1379 < 0)
1380 ret = -1;
1381 #endif /* CONFIG_IEEE80211W */
1382
1383 return ret;
1384 }
1385
1386
wpa_send_eapol_timeout(void * eloop_ctx,void * timeout_ctx)1387 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1388 {
1389 struct wpa_authenticator *wpa_auth = eloop_ctx;
1390 struct wpa_state_machine *sm = timeout_ctx;
1391
1392 sm->pending_1_of_4_timeout = 0;
1393 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1394 sm->TimeoutEvt = TRUE;
1395 wpa_sm_step(sm);
1396 }
1397
1398
__wpa_send_eapol(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int key_info,const u8 * key_rsc,const u8 * nonce,const u8 * kde,size_t kde_len,int keyidx,int encr,int force_version)1399 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1400 struct wpa_state_machine *sm, int key_info,
1401 const u8 *key_rsc, const u8 *nonce,
1402 const u8 *kde, size_t kde_len,
1403 int keyidx, int encr, int force_version)
1404 {
1405 struct ieee802_1x_hdr *hdr;
1406 struct wpa_eapol_key *key;
1407 size_t len, mic_len, keyhdrlen;
1408 int alg;
1409 int key_data_len, pad_len = 0;
1410 u8 *buf, *pos;
1411 int version, pairwise;
1412 int i;
1413 u8 *key_mic, *key_data;
1414
1415 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
1416 keyhdrlen = sizeof(*key) + mic_len + 2;
1417
1418 len = sizeof(struct ieee802_1x_hdr) + keyhdrlen;
1419
1420 if (force_version)
1421 version = force_version;
1422 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1423 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1424 wpa_key_mgmt_fils(sm->wpa_key_mgmt))
1425 version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1426 else if (wpa_use_aes_cmac(sm))
1427 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1428 else if (sm->pairwise != WPA_CIPHER_TKIP)
1429 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1430 else
1431 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1432
1433 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1434
1435 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1436 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1437 "encr=%d)",
1438 version,
1439 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1440 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1441 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1442 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1443 pairwise, (unsigned long) kde_len, keyidx, encr);
1444
1445 key_data_len = kde_len;
1446
1447 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1448 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1449 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1450 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1451 pad_len = key_data_len % 8;
1452 if (pad_len)
1453 pad_len = 8 - pad_len;
1454 key_data_len += pad_len + 8;
1455 }
1456
1457 len += key_data_len;
1458 if (!mic_len && encr)
1459 len += AES_BLOCK_SIZE;
1460
1461 hdr = os_zalloc(len);
1462 if (hdr == NULL)
1463 return;
1464 hdr->version = wpa_auth->conf.eapol_version;
1465 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1466 hdr->length = host_to_be16(len - sizeof(*hdr));
1467 key = (struct wpa_eapol_key *) (hdr + 1);
1468 key_mic = (u8 *) (key + 1);
1469 key_data = ((u8 *) (hdr + 1)) + keyhdrlen;
1470
1471 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1472 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1473 key_info |= version;
1474 if (encr && sm->wpa == WPA_VERSION_WPA2)
1475 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1476 if (sm->wpa != WPA_VERSION_WPA2)
1477 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1478 WPA_PUT_BE16(key->key_info, key_info);
1479
1480 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1481 if ((key_info & WPA_KEY_INFO_SMK_MESSAGE) ||
1482 (sm->wpa == WPA_VERSION_WPA2 && !pairwise))
1483 WPA_PUT_BE16(key->key_length, 0);
1484 else
1485 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1486
1487 /* FIX: STSL: what to use as key_replay_counter? */
1488 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1489 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1490 os_memcpy(sm->key_replay[i].counter,
1491 sm->key_replay[i - 1].counter,
1492 WPA_REPLAY_COUNTER_LEN);
1493 }
1494 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1495 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1496 WPA_REPLAY_COUNTER_LEN);
1497 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter",
1498 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1499 sm->key_replay[0].valid = TRUE;
1500
1501 if (nonce)
1502 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1503
1504 if (key_rsc)
1505 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1506
1507 if (kde && !encr) {
1508 os_memcpy(key_data, kde, kde_len);
1509 WPA_PUT_BE16(key_mic + mic_len, kde_len);
1510 #ifdef CONFIG_FILS
1511 } else if (!mic_len) {
1512 const u8 *aad[1];
1513 size_t aad_len[1];
1514
1515 WPA_PUT_BE16(key_mic, AES_BLOCK_SIZE + kde_len);
1516 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1517 kde, kde_len);
1518
1519 wpa_hexdump_key(MSG_DEBUG, "WPA: KEK",
1520 sm->PTK.kek, sm->PTK.kek_len);
1521 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
1522 * to Key Data (exclusive). */
1523 aad[0] = (u8 *) hdr;
1524 aad_len[0] = key_mic + 2 - (u8 *) hdr;
1525 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len, kde, kde_len,
1526 1, aad, aad_len, key_mic + 2) < 0) {
1527 wpa_printf(MSG_DEBUG, "WPA: AES-SIV encryption failed");
1528 return;
1529 }
1530
1531 wpa_hexdump(MSG_DEBUG, "WPA: Encrypted Key Data from SIV",
1532 key_mic + 2, AES_BLOCK_SIZE + kde_len);
1533 #endif /* CONFIG_FILS */
1534 } else if (encr && kde) {
1535 buf = os_zalloc(key_data_len);
1536 if (buf == NULL) {
1537 os_free(hdr);
1538 return;
1539 }
1540 pos = buf;
1541 os_memcpy(pos, kde, kde_len);
1542 pos += kde_len;
1543
1544 if (pad_len)
1545 *pos++ = 0xdd;
1546
1547 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1548 buf, key_data_len);
1549 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1550 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1551 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1552 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1553 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len,
1554 (key_data_len - 8) / 8, buf, key_data)) {
1555 os_free(hdr);
1556 os_free(buf);
1557 return;
1558 }
1559 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1560 #ifndef CONFIG_NO_RC4
1561 } else if (sm->PTK.kek_len == 16) {
1562 u8 ek[32];
1563 os_memcpy(key->key_iv,
1564 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1565 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1566 os_memcpy(ek, key->key_iv, 16);
1567 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len);
1568 os_memcpy(key_data, buf, key_data_len);
1569 rc4_skip(ek, 32, 256, key_data, key_data_len);
1570 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1571 #endif /* CONFIG_NO_RC4 */
1572 } else {
1573 os_free(hdr);
1574 os_free(buf);
1575 return;
1576 }
1577 os_free(buf);
1578 }
1579
1580 if (key_info & WPA_KEY_INFO_MIC) {
1581 if (!sm->PTK_valid || !mic_len) {
1582 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1583 "PTK not valid when sending EAPOL-Key "
1584 "frame");
1585 os_free(hdr);
1586 return;
1587 }
1588
1589 wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
1590 sm->wpa_key_mgmt, version,
1591 (u8 *) hdr, len, key_mic);
1592 #ifdef CONFIG_TESTING_OPTIONS
1593 if (!pairwise &&
1594 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1595 drand48() <
1596 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1597 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1598 "Corrupting group EAPOL-Key Key MIC");
1599 key_mic[0]++;
1600 }
1601 #endif /* CONFIG_TESTING_OPTIONS */
1602 }
1603
1604 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1605 1);
1606 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1607 sm->pairwise_set);
1608 os_free(hdr);
1609 }
1610
1611
wpa_send_eapol(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int key_info,const u8 * key_rsc,const u8 * nonce,const u8 * kde,size_t kde_len,int keyidx,int encr)1612 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1613 struct wpa_state_machine *sm, int key_info,
1614 const u8 *key_rsc, const u8 *nonce,
1615 const u8 *kde, size_t kde_len,
1616 int keyidx, int encr)
1617 {
1618 int timeout_ms;
1619 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1620 u32 ctr;
1621
1622 if (sm == NULL)
1623 return;
1624
1625 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1626 keyidx, encr, 0);
1627
1628 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1629 if (ctr == 1 && wpa_auth->conf.tx_status)
1630 timeout_ms = pairwise ? eapol_key_timeout_first :
1631 eapol_key_timeout_first_group;
1632 else
1633 timeout_ms = eapol_key_timeout_subseq;
1634 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1635 sm->pending_1_of_4_timeout = 1;
1636 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1637 "counter %u)", timeout_ms, ctr);
1638 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1639 wpa_send_eapol_timeout, wpa_auth, sm);
1640 }
1641
1642
wpa_verify_key_mic(int akmp,struct wpa_ptk * PTK,u8 * data,size_t data_len)1643 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
1644 size_t data_len)
1645 {
1646 struct ieee802_1x_hdr *hdr;
1647 struct wpa_eapol_key *key;
1648 u16 key_info;
1649 int ret = 0;
1650 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN], *mic_pos;
1651 size_t mic_len = wpa_mic_len(akmp);
1652
1653 if (data_len < sizeof(*hdr) + sizeof(*key))
1654 return -1;
1655
1656 hdr = (struct ieee802_1x_hdr *) data;
1657 key = (struct wpa_eapol_key *) (hdr + 1);
1658 mic_pos = (u8 *) (key + 1);
1659 key_info = WPA_GET_BE16(key->key_info);
1660 os_memcpy(mic, mic_pos, mic_len);
1661 os_memset(mic_pos, 0, mic_len);
1662 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp,
1663 key_info & WPA_KEY_INFO_TYPE_MASK,
1664 data, data_len, mic_pos) ||
1665 os_memcmp_const(mic, mic_pos, mic_len) != 0)
1666 ret = -1;
1667 os_memcpy(mic_pos, mic, mic_len);
1668 return ret;
1669 }
1670
1671
wpa_remove_ptk(struct wpa_state_machine * sm)1672 void wpa_remove_ptk(struct wpa_state_machine *sm)
1673 {
1674 sm->PTK_valid = FALSE;
1675 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1676 if (wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL,
1677 0))
1678 wpa_printf(MSG_DEBUG,
1679 "RSN: PTK removal from the driver failed");
1680 sm->pairwise_set = FALSE;
1681 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1682 }
1683
1684
wpa_auth_sm_event(struct wpa_state_machine * sm,enum wpa_event event)1685 int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event)
1686 {
1687 int remove_ptk = 1;
1688
1689 if (sm == NULL)
1690 return -1;
1691
1692 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1693 "event %d notification", event);
1694
1695 switch (event) {
1696 case WPA_AUTH:
1697 #ifdef CONFIG_MESH
1698 /* PTKs are derived through AMPE */
1699 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) {
1700 /* not mesh */
1701 break;
1702 }
1703 return 0;
1704 #endif /* CONFIG_MESH */
1705 case WPA_ASSOC:
1706 break;
1707 case WPA_DEAUTH:
1708 case WPA_DISASSOC:
1709 sm->DeauthenticationRequest = TRUE;
1710 break;
1711 case WPA_REAUTH:
1712 case WPA_REAUTH_EAPOL:
1713 if (!sm->started) {
1714 /*
1715 * When using WPS, we may end up here if the STA
1716 * manages to re-associate without the previous STA
1717 * entry getting removed. Consequently, we need to make
1718 * sure that the WPA state machines gets initialized
1719 * properly at this point.
1720 */
1721 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1722 "started - initialize now");
1723 sm->started = 1;
1724 sm->Init = TRUE;
1725 if (wpa_sm_step(sm) == 1)
1726 return 1; /* should not really happen */
1727 sm->Init = FALSE;
1728 sm->AuthenticationRequest = TRUE;
1729 break;
1730 }
1731 if (sm->GUpdateStationKeys) {
1732 /*
1733 * Reauthentication cancels the pending group key
1734 * update for this STA.
1735 */
1736 sm->group->GKeyDoneStations--;
1737 sm->GUpdateStationKeys = FALSE;
1738 sm->PtkGroupInit = TRUE;
1739 }
1740 sm->ReAuthenticationRequest = TRUE;
1741 break;
1742 case WPA_ASSOC_FT:
1743 #ifdef CONFIG_IEEE80211R_AP
1744 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1745 "after association");
1746 wpa_ft_install_ptk(sm);
1747
1748 /* Using FT protocol, not WPA auth state machine */
1749 sm->ft_completed = 1;
1750 return 0;
1751 #else /* CONFIG_IEEE80211R_AP */
1752 break;
1753 #endif /* CONFIG_IEEE80211R_AP */
1754 }
1755
1756 #ifdef CONFIG_IEEE80211R_AP
1757 sm->ft_completed = 0;
1758 #endif /* CONFIG_IEEE80211R_AP */
1759
1760 #ifdef CONFIG_IEEE80211W
1761 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1762 remove_ptk = 0;
1763 #endif /* CONFIG_IEEE80211W */
1764 #ifdef CONFIG_FILS
1765 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1766 (event == WPA_AUTH || event == WPA_ASSOC))
1767 remove_ptk = 0;
1768 #endif /* CONFIG_FILS */
1769
1770 if (remove_ptk) {
1771 sm->PTK_valid = FALSE;
1772 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1773
1774 if (event != WPA_REAUTH_EAPOL)
1775 wpa_remove_ptk(sm);
1776 }
1777
1778 if (sm->in_step_loop) {
1779 /*
1780 * wpa_sm_step() is already running - avoid recursive call to
1781 * it by making the existing loop process the new update.
1782 */
1783 sm->changed = TRUE;
1784 return 0;
1785 }
1786 return wpa_sm_step(sm);
1787 }
1788
1789
SM_STATE(WPA_PTK,INITIALIZE)1790 SM_STATE(WPA_PTK, INITIALIZE)
1791 {
1792 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1793 if (sm->Init) {
1794 /* Init flag is not cleared here, so avoid busy
1795 * loop by claiming nothing changed. */
1796 sm->changed = FALSE;
1797 }
1798
1799 sm->keycount = 0;
1800 if (sm->GUpdateStationKeys)
1801 sm->group->GKeyDoneStations--;
1802 sm->GUpdateStationKeys = FALSE;
1803 if (sm->wpa == WPA_VERSION_WPA)
1804 sm->PInitAKeys = FALSE;
1805 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1806 * Local AA > Remote AA)) */) {
1807 sm->Pair = TRUE;
1808 }
1809 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1810 wpa_remove_ptk(sm);
1811 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1812 sm->TimeoutCtr = 0;
1813 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1814 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1815 WPA_EAPOL_authorized, 0);
1816 }
1817 }
1818
1819
SM_STATE(WPA_PTK,DISCONNECT)1820 SM_STATE(WPA_PTK, DISCONNECT)
1821 {
1822 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1823 sm->Disconnect = FALSE;
1824 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1825 }
1826
1827
SM_STATE(WPA_PTK,DISCONNECTED)1828 SM_STATE(WPA_PTK, DISCONNECTED)
1829 {
1830 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1831 sm->DeauthenticationRequest = FALSE;
1832 }
1833
1834
SM_STATE(WPA_PTK,AUTHENTICATION)1835 SM_STATE(WPA_PTK, AUTHENTICATION)
1836 {
1837 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1838 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1839 sm->PTK_valid = FALSE;
1840 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1841 1);
1842 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1843 sm->AuthenticationRequest = FALSE;
1844 }
1845
1846
wpa_group_ensure_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)1847 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1848 struct wpa_group *group)
1849 {
1850 if (group->first_sta_seen)
1851 return;
1852 /*
1853 * System has run bit further than at the time hostapd was started
1854 * potentially very early during boot up. This provides better chances
1855 * of collecting more randomness on embedded systems. Re-initialize the
1856 * GMK and Counter here to improve their strength if there was not
1857 * enough entropy available immediately after system startup.
1858 */
1859 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1860 "station");
1861 if (random_pool_ready() != 1) {
1862 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1863 "to proceed - reject first 4-way handshake");
1864 group->reject_4way_hs_for_entropy = TRUE;
1865 } else {
1866 group->first_sta_seen = TRUE;
1867 group->reject_4way_hs_for_entropy = FALSE;
1868 }
1869
1870 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0 ||
1871 wpa_gtk_update(wpa_auth, group) < 0 ||
1872 wpa_group_config_group_keys(wpa_auth, group) < 0) {
1873 wpa_printf(MSG_INFO, "WPA: GMK/GTK setup failed");
1874 group->first_sta_seen = FALSE;
1875 group->reject_4way_hs_for_entropy = TRUE;
1876 }
1877 }
1878
1879
SM_STATE(WPA_PTK,AUTHENTICATION2)1880 SM_STATE(WPA_PTK, AUTHENTICATION2)
1881 {
1882 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1883
1884 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1885 sm->ReAuthenticationRequest = FALSE;
1886
1887 /*
1888 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1889 * ambiguous. The Authenticator state machine uses a counter that is
1890 * incremented by one for each 4-way handshake. However, the security
1891 * analysis of 4-way handshake points out that unpredictable nonces
1892 * help in preventing precomputation attacks. Instead of the state
1893 * machine definition, use an unpredictable nonce value here to provide
1894 * stronger protection against potential precomputation attacks.
1895 */
1896 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1897 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1898 "ANonce.");
1899 sm->Disconnect = TRUE;
1900 return;
1901 }
1902 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1903 WPA_NONCE_LEN);
1904 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1905 * logical place than INITIALIZE since AUTHENTICATION2 can be
1906 * re-entered on ReAuthenticationRequest without going through
1907 * INITIALIZE. */
1908 sm->TimeoutCtr = 0;
1909 }
1910
1911
SM_STATE(WPA_PTK,INITPMK)1912 SM_STATE(WPA_PTK, INITPMK)
1913 {
1914 u8 msk[2 * PMK_LEN];
1915 size_t len = 2 * PMK_LEN;
1916
1917 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1918 #ifdef CONFIG_IEEE80211R_AP
1919 sm->xxkey_len = 0;
1920 #endif /* CONFIG_IEEE80211R_AP */
1921 if (sm->pmksa) {
1922 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1923 os_memcpy(sm->PMK, sm->pmksa->pmk, sm->pmksa->pmk_len);
1924 sm->pmk_len = sm->pmksa->pmk_len;
1925 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1926 unsigned int pmk_len;
1927
1928 if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt))
1929 pmk_len = PMK_LEN_SUITE_B_192;
1930 else
1931 pmk_len = PMK_LEN;
1932 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1933 "(MSK len=%lu PMK len=%u)", (unsigned long) len,
1934 pmk_len);
1935 if (len < pmk_len) {
1936 wpa_printf(MSG_DEBUG,
1937 "WPA: MSK not long enough (%u) to create PMK (%u)",
1938 (unsigned int) len, (unsigned int) pmk_len);
1939 sm->Disconnect = TRUE;
1940 return;
1941 }
1942 os_memcpy(sm->PMK, msk, pmk_len);
1943 sm->pmk_len = pmk_len;
1944 #ifdef CONFIG_IEEE80211R_AP
1945 if (len >= 2 * PMK_LEN) {
1946 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1947 sm->xxkey_len = PMK_LEN;
1948 }
1949 #endif /* CONFIG_IEEE80211R_AP */
1950 } else {
1951 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p",
1952 sm->wpa_auth->cb->get_msk);
1953 sm->Disconnect = TRUE;
1954 return;
1955 }
1956 os_memset(msk, 0, sizeof(msk));
1957
1958 sm->req_replay_counter_used = 0;
1959 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1960 * will break reauthentication since EAPOL state machines may not be
1961 * get into AUTHENTICATING state that clears keyRun before WPA state
1962 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1963 * state and takes PMK from the previously used AAA Key. This will
1964 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1965 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1966 * be good workaround for this issue. */
1967 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1968 }
1969
1970
SM_STATE(WPA_PTK,INITPSK)1971 SM_STATE(WPA_PTK, INITPSK)
1972 {
1973 const u8 *psk;
1974 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1975 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1976 if (psk) {
1977 os_memcpy(sm->PMK, psk, PMK_LEN);
1978 sm->pmk_len = PMK_LEN;
1979 #ifdef CONFIG_IEEE80211R_AP
1980 os_memcpy(sm->xxkey, psk, PMK_LEN);
1981 sm->xxkey_len = PMK_LEN;
1982 #endif /* CONFIG_IEEE80211R_AP */
1983 }
1984 sm->req_replay_counter_used = 0;
1985 }
1986
1987
SM_STATE(WPA_PTK,PTKSTART)1988 SM_STATE(WPA_PTK, PTKSTART)
1989 {
1990 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1991 size_t pmkid_len = 0;
1992
1993 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1994 sm->PTKRequest = FALSE;
1995 sm->TimeoutEvt = FALSE;
1996 sm->alt_snonce_valid = FALSE;
1997
1998 sm->TimeoutCtr++;
1999 if (sm->TimeoutCtr > sm->wpa_auth->conf.wpa_pairwise_update_count) {
2000 /* No point in sending the EAPOL-Key - we will disconnect
2001 * immediately following this. */
2002 return;
2003 }
2004
2005 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2006 "sending 1/4 msg of 4-Way Handshake");
2007 /*
2008 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
2009 * one possible PSK for this STA.
2010 */
2011 if (sm->wpa == WPA_VERSION_WPA2 &&
2012 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2013 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
2014 pmkid = buf;
2015 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
2016 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
2017 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
2018 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
2019 if (sm->pmksa) {
2020 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
2021 sm->pmksa->pmkid, PMKID_LEN);
2022 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) {
2023 /* No KCK available to derive PMKID */
2024 pmkid = NULL;
2025 } else {
2026 /*
2027 * Calculate PMKID since no PMKSA cache entry was
2028 * available with pre-calculated PMKID.
2029 */
2030 rsn_pmkid(sm->PMK, sm->pmk_len, sm->wpa_auth->addr,
2031 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
2032 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
2033 }
2034 }
2035 wpa_send_eapol(sm->wpa_auth, sm,
2036 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
2037 sm->ANonce, pmkid, pmkid_len, 0, 0);
2038 }
2039
2040
wpa_derive_ptk(struct wpa_state_machine * sm,const u8 * snonce,const u8 * pmk,unsigned int pmk_len,struct wpa_ptk * ptk)2041 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
2042 const u8 *pmk, unsigned int pmk_len,
2043 struct wpa_ptk *ptk)
2044 {
2045 #ifdef CONFIG_IEEE80211R_AP
2046 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
2047 return wpa_auth_derive_ptk_ft(sm, pmk, ptk);
2048 #endif /* CONFIG_IEEE80211R_AP */
2049
2050 return wpa_pmk_to_ptk(pmk, pmk_len, "Pairwise key expansion",
2051 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce,
2052 ptk, sm->wpa_key_mgmt, sm->pairwise);
2053 }
2054
2055
2056 #ifdef CONFIG_FILS
2057
fils_auth_pmk_to_ptk(struct wpa_state_machine * sm,const u8 * pmk,size_t pmk_len,const u8 * snonce,const u8 * anonce)2058 int fils_auth_pmk_to_ptk(struct wpa_state_machine *sm, const u8 *pmk,
2059 size_t pmk_len, const u8 *snonce, const u8 *anonce)
2060 {
2061 u8 ick[FILS_ICK_MAX_LEN];
2062 size_t ick_len;
2063 int res;
2064
2065 res = fils_pmk_to_ptk(pmk, pmk_len, sm->addr, sm->wpa_auth->addr,
2066 snonce, anonce, &sm->PTK, ick, &ick_len,
2067 sm->wpa_key_mgmt, sm->pairwise);
2068 if (res < 0)
2069 return res;
2070 sm->PTK_valid = TRUE;
2071
2072 res = fils_key_auth_sk(ick, ick_len, snonce, anonce,
2073 sm->addr, sm->wpa_auth->addr,
2074 NULL, 0, NULL, 0, /* TODO: SK+PFS */
2075 sm->wpa_key_mgmt, sm->fils_key_auth_sta,
2076 sm->fils_key_auth_ap,
2077 &sm->fils_key_auth_len);
2078 os_memset(ick, 0, sizeof(ick));
2079
2080 /* Store nonces for (Re)Association Request/Response frame processing */
2081 os_memcpy(sm->SNonce, snonce, FILS_NONCE_LEN);
2082 os_memcpy(sm->ANonce, anonce, FILS_NONCE_LEN);
2083
2084 return res;
2085 }
2086
2087
wpa_aead_decrypt(struct wpa_state_machine * sm,struct wpa_ptk * ptk,u8 * buf,size_t buf_len,u16 * _key_data_len)2088 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
2089 u8 *buf, size_t buf_len, u16 *_key_data_len)
2090 {
2091 struct ieee802_1x_hdr *hdr;
2092 struct wpa_eapol_key *key;
2093 u8 *pos;
2094 u16 key_data_len;
2095 u8 *tmp;
2096 const u8 *aad[1];
2097 size_t aad_len[1];
2098
2099 hdr = (struct ieee802_1x_hdr *) buf;
2100 key = (struct wpa_eapol_key *) (hdr + 1);
2101 pos = (u8 *) (key + 1);
2102 key_data_len = WPA_GET_BE16(pos);
2103 if (key_data_len < AES_BLOCK_SIZE ||
2104 key_data_len > buf_len - sizeof(*hdr) - sizeof(*key) - 2) {
2105 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2106 "No room for AES-SIV data in the frame");
2107 return -1;
2108 }
2109 pos += 2; /* Pointing at the Encrypted Key Data field */
2110
2111 tmp = os_malloc(key_data_len);
2112 if (!tmp)
2113 return -1;
2114
2115 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
2116 * to Key Data (exclusive). */
2117 aad[0] = buf;
2118 aad_len[0] = pos - buf;
2119 if (aes_siv_decrypt(ptk->kek, ptk->kek_len, pos, key_data_len,
2120 1, aad, aad_len, tmp) < 0) {
2121 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2122 "Invalid AES-SIV data in the frame");
2123 bin_clear_free(tmp, key_data_len);
2124 return -1;
2125 }
2126
2127 /* AEAD decryption and validation completed successfully */
2128 key_data_len -= AES_BLOCK_SIZE;
2129 wpa_hexdump_key(MSG_DEBUG, "WPA: Decrypted Key Data",
2130 tmp, key_data_len);
2131
2132 /* Replace Key Data field with the decrypted version */
2133 os_memcpy(pos, tmp, key_data_len);
2134 pos -= 2; /* Key Data Length field */
2135 WPA_PUT_BE16(pos, key_data_len);
2136 bin_clear_free(tmp, key_data_len);
2137 if (_key_data_len)
2138 *_key_data_len = key_data_len;
2139 return 0;
2140 }
2141
2142
fils_decrypt_assoc(struct wpa_state_machine * sm,const u8 * fils_session,const struct ieee80211_mgmt * mgmt,size_t frame_len,u8 * pos,size_t left)2143 int fils_decrypt_assoc(struct wpa_state_machine *sm, const u8 *fils_session,
2144 const struct ieee80211_mgmt *mgmt, size_t frame_len,
2145 u8 *pos, size_t left)
2146 {
2147 u16 fc, stype;
2148 const u8 *end, *ie_start, *ie, *session, *crypt;
2149 struct ieee802_11_elems elems;
2150 const u8 *aad[5];
2151 size_t aad_len[5];
2152
2153 if (!sm || !sm->PTK_valid) {
2154 wpa_printf(MSG_DEBUG,
2155 "FILS: No KEK to decrypt Assocication Request frame");
2156 return -1;
2157 }
2158
2159 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2160 wpa_printf(MSG_DEBUG,
2161 "FILS: Not a FILS AKM - reject association");
2162 return -1;
2163 }
2164
2165 end = ((const u8 *) mgmt) + frame_len;
2166 fc = le_to_host16(mgmt->frame_control);
2167 stype = WLAN_FC_GET_STYPE(fc);
2168 if (stype == WLAN_FC_STYPE_REASSOC_REQ)
2169 ie_start = mgmt->u.reassoc_req.variable;
2170 else
2171 ie_start = mgmt->u.assoc_req.variable;
2172 ie = ie_start;
2173
2174 /*
2175 * Find FILS Session element which is the last unencrypted element in
2176 * the frame.
2177 */
2178 session = NULL;
2179 while (ie + 1 < end) {
2180 if (ie + 2 + ie[1] > end)
2181 break;
2182 if (ie[0] == WLAN_EID_EXTENSION &&
2183 ie[1] >= 1 + FILS_SESSION_LEN &&
2184 ie[2] == WLAN_EID_EXT_FILS_SESSION) {
2185 session = ie;
2186 break;
2187 }
2188 ie += 2 + ie[1];
2189 }
2190
2191 if (!session) {
2192 wpa_printf(MSG_DEBUG,
2193 "FILS: Could not find FILS Session element in Association Request frame - reject");
2194 return -1;
2195 }
2196 if (os_memcmp(fils_session, session + 3, FILS_SESSION_LEN) != 0) {
2197 wpa_printf(MSG_DEBUG, "FILS: Session mismatch");
2198 wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session",
2199 fils_session, FILS_SESSION_LEN);
2200 wpa_hexdump(MSG_DEBUG, "FILS: Received FILS Session",
2201 session + 3, FILS_SESSION_LEN);
2202 return -1;
2203 }
2204 crypt = session + 2 + session[1];
2205
2206 if (end - crypt < AES_BLOCK_SIZE) {
2207 wpa_printf(MSG_DEBUG,
2208 "FILS: Too short frame to include AES-SIV data");
2209 return -1;
2210 }
2211
2212 /* AES-SIV AAD vectors */
2213
2214 /* The STA's MAC address */
2215 aad[0] = mgmt->sa;
2216 aad_len[0] = ETH_ALEN;
2217 /* The AP's BSSID */
2218 aad[1] = mgmt->da;
2219 aad_len[1] = ETH_ALEN;
2220 /* The STA's nonce */
2221 aad[2] = sm->SNonce;
2222 aad_len[2] = FILS_NONCE_LEN;
2223 /* The AP's nonce */
2224 aad[3] = sm->ANonce;
2225 aad_len[3] = FILS_NONCE_LEN;
2226 /*
2227 * The (Re)Association Request frame from the Capability Information
2228 * field to the FILS Session element (both inclusive).
2229 */
2230 aad[4] = (const u8 *) &mgmt->u.assoc_req.capab_info;
2231 aad_len[4] = crypt - aad[4];
2232
2233 if (aes_siv_decrypt(sm->PTK.kek, sm->PTK.kek_len, crypt, end - crypt,
2234 5, aad, aad_len, pos + (crypt - ie_start)) < 0) {
2235 wpa_printf(MSG_DEBUG,
2236 "FILS: Invalid AES-SIV data in the frame");
2237 return -1;
2238 }
2239 wpa_hexdump(MSG_DEBUG, "FILS: Decrypted Association Request elements",
2240 pos, left - AES_BLOCK_SIZE);
2241
2242 if (ieee802_11_parse_elems(pos, left - AES_BLOCK_SIZE, &elems, 1) ==
2243 ParseFailed) {
2244 wpa_printf(MSG_DEBUG,
2245 "FILS: Failed to parse decrypted elements");
2246 return -1;
2247 }
2248 if (!elems.fils_key_confirm) {
2249 wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element");
2250 return -1;
2251 }
2252 if (elems.fils_key_confirm_len != sm->fils_key_auth_len) {
2253 wpa_printf(MSG_DEBUG,
2254 "FILS: Unexpected Key-Auth length %d (expected %d)",
2255 elems.fils_key_confirm_len,
2256 (int) sm->fils_key_auth_len);
2257 return -1;
2258 }
2259 if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_sta,
2260 sm->fils_key_auth_len) != 0) {
2261 wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch");
2262 wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth",
2263 elems.fils_key_confirm,
2264 elems.fils_key_confirm_len);
2265 wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth",
2266 sm->fils_key_auth_sta, sm->fils_key_auth_len);
2267 return -1;
2268 }
2269
2270 return left - AES_BLOCK_SIZE;
2271 }
2272
2273
fils_encrypt_assoc(struct wpa_state_machine * sm,u8 * buf,size_t current_len,size_t max_len,const struct wpabuf * hlp)2274 int fils_encrypt_assoc(struct wpa_state_machine *sm, u8 *buf,
2275 size_t current_len, size_t max_len,
2276 const struct wpabuf *hlp)
2277 {
2278 u8 *end = buf + max_len;
2279 u8 *pos = buf + current_len;
2280 struct ieee80211_mgmt *mgmt;
2281 struct wpabuf *plain;
2282 u8 *len, *tmp, *tmp2;
2283 u8 hdr[2];
2284 u8 *gtk, dummy_gtk[32];
2285 size_t gtk_len;
2286 struct wpa_group *gsm;
2287 const u8 *aad[5];
2288 size_t aad_len[5];
2289
2290 if (!sm || !sm->PTK_valid)
2291 return -1;
2292
2293 wpa_hexdump(MSG_DEBUG,
2294 "FILS: Association Response frame before FILS processing",
2295 buf, current_len);
2296
2297 mgmt = (struct ieee80211_mgmt *) buf;
2298
2299 /* AES-SIV AAD vectors */
2300
2301 /* The AP's BSSID */
2302 aad[0] = mgmt->sa;
2303 aad_len[0] = ETH_ALEN;
2304 /* The STA's MAC address */
2305 aad[1] = mgmt->da;
2306 aad_len[1] = ETH_ALEN;
2307 /* The AP's nonce */
2308 aad[2] = sm->ANonce;
2309 aad_len[2] = FILS_NONCE_LEN;
2310 /* The STA's nonce */
2311 aad[3] = sm->SNonce;
2312 aad_len[3] = FILS_NONCE_LEN;
2313 /*
2314 * The (Re)Association Response frame from the Capability Information
2315 * field (the same offset in both Association and Reassociation
2316 * Response frames) to the FILS Session element (both inclusive).
2317 */
2318 aad[4] = (const u8 *) &mgmt->u.assoc_resp.capab_info;
2319 aad_len[4] = pos - aad[4];
2320
2321 /* The following elements will be encrypted with AES-SIV */
2322
2323 plain = wpabuf_alloc(1000);
2324 if (!plain)
2325 return -1;
2326
2327 /* TODO: FILS Public Key */
2328
2329 /* FILS Key Confirmation */
2330 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2331 wpabuf_put_u8(plain, 1 + sm->fils_key_auth_len); /* Length */
2332 /* Element ID Extension */
2333 wpabuf_put_u8(plain, WLAN_EID_EXT_FILS_KEY_CONFIRM);
2334 wpabuf_put_data(plain, sm->fils_key_auth_ap, sm->fils_key_auth_len);
2335
2336 /* FILS HLP Container */
2337 if (hlp)
2338 wpabuf_put_buf(plain, hlp);
2339
2340 /* TODO: FILS IP Address Assignment */
2341
2342 /* Key Delivery */
2343 gsm = sm->group;
2344 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2345 len = wpabuf_put(plain, 1);
2346 wpabuf_put_u8(plain, WLAN_EID_EXT_KEY_DELIVERY);
2347 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN,
2348 wpabuf_put(plain, WPA_KEY_RSC_LEN));
2349 /* GTK KDE */
2350 gtk = gsm->GTK[gsm->GN - 1];
2351 gtk_len = gsm->GTK_len;
2352 if (sm->wpa_auth->conf.disable_gtk) {
2353 /*
2354 * Provide unique random GTK to each STA to prevent use
2355 * of GTK in the BSS.
2356 */
2357 if (random_get_bytes(dummy_gtk, gtk_len) < 0) {
2358 wpabuf_free(plain);
2359 return -1;
2360 }
2361 gtk = dummy_gtk;
2362 }
2363 hdr[0] = gsm->GN & 0x03;
2364 hdr[1] = 0;
2365 tmp = wpabuf_put(plain, 0);
2366 tmp2 = wpa_add_kde(tmp, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2367 gtk, gtk_len);
2368 wpabuf_put(plain, tmp2 - tmp);
2369
2370 /* IGTK KDE */
2371 tmp = wpabuf_put(plain, 0);
2372 tmp2 = ieee80211w_kde_add(sm, tmp);
2373 wpabuf_put(plain, tmp2 - tmp);
2374
2375 *len = (u8 *) wpabuf_put(plain, 0) - len - 1;
2376
2377 if (pos + wpabuf_len(plain) + AES_BLOCK_SIZE > end) {
2378 wpa_printf(MSG_DEBUG,
2379 "FILS: Not enough room for FILS elements");
2380 wpabuf_free(plain);
2381 return -1;
2382 }
2383
2384 wpa_hexdump_buf_key(MSG_DEBUG, "FILS: Association Response plaintext",
2385 plain);
2386
2387 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len,
2388 wpabuf_head(plain), wpabuf_len(plain),
2389 5, aad, aad_len, pos) < 0) {
2390 wpabuf_free(plain);
2391 return -1;
2392 }
2393
2394 wpa_hexdump(MSG_DEBUG,
2395 "FILS: Encrypted Association Response elements",
2396 pos, AES_BLOCK_SIZE + wpabuf_len(plain));
2397 current_len += wpabuf_len(plain) + AES_BLOCK_SIZE;
2398 wpabuf_free(plain);
2399
2400 sm->fils_completed = 1;
2401
2402 return current_len;
2403 }
2404
2405
fils_set_tk(struct wpa_state_machine * sm)2406 int fils_set_tk(struct wpa_state_machine *sm)
2407 {
2408 enum wpa_alg alg;
2409 int klen;
2410
2411 if (!sm || !sm->PTK_valid)
2412 return -1;
2413
2414 alg = wpa_cipher_to_alg(sm->pairwise);
2415 klen = wpa_cipher_key_len(sm->pairwise);
2416
2417 wpa_printf(MSG_DEBUG, "FILS: Configure TK to the driver");
2418 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2419 sm->PTK.tk, klen)) {
2420 wpa_printf(MSG_DEBUG, "FILS: Failed to set TK to the driver");
2421 return -1;
2422 }
2423
2424 return 0;
2425 }
2426
2427 #endif /* CONFIG_FILS */
2428
2429
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING)2430 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
2431 {
2432 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2433 struct wpa_ptk PTK;
2434 int ok = 0, psk_found = 0;
2435 const u8 *pmk = NULL;
2436 unsigned int pmk_len;
2437 int ft;
2438 const u8 *eapol_key_ie, *key_data, *mic;
2439 u16 key_data_length;
2440 size_t mic_len, eapol_key_ie_len;
2441 struct ieee802_1x_hdr *hdr;
2442 struct wpa_eapol_key *key;
2443 struct wpa_eapol_ie_parse kde;
2444
2445 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
2446 sm->EAPOLKeyReceived = FALSE;
2447 sm->update_snonce = FALSE;
2448 os_memset(&PTK, 0, sizeof(PTK));
2449
2450 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
2451
2452 /* WPA with IEEE 802.1X: use the derived PMK from EAP
2453 * WPA-PSK: iterate through possible PSKs and select the one matching
2454 * the packet */
2455 for (;;) {
2456 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2457 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
2458 sm->p2p_dev_addr, pmk);
2459 if (pmk == NULL)
2460 break;
2461 psk_found = 1;
2462 pmk_len = PMK_LEN;
2463 } else {
2464 pmk = sm->PMK;
2465 pmk_len = sm->pmk_len;
2466 }
2467
2468 if (wpa_derive_ptk(sm, sm->SNonce, pmk, pmk_len, &PTK) < 0)
2469 break;
2470
2471 if (mic_len &&
2472 wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK,
2473 sm->last_rx_eapol_key,
2474 sm->last_rx_eapol_key_len) == 0) {
2475 ok = 1;
2476 break;
2477 }
2478
2479 #ifdef CONFIG_FILS
2480 if (!mic_len &&
2481 wpa_aead_decrypt(sm, &PTK, sm->last_rx_eapol_key,
2482 sm->last_rx_eapol_key_len, NULL) == 0) {
2483 ok = 1;
2484 break;
2485 }
2486 #endif /* CONFIG_FILS */
2487
2488 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
2489 break;
2490 }
2491
2492 if (!ok) {
2493 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2494 "invalid MIC in msg 2/4 of 4-Way Handshake");
2495 if (psk_found)
2496 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr);
2497 return;
2498 }
2499
2500 /*
2501 * Note: last_rx_eapol_key length fields have already been validated in
2502 * wpa_receive().
2503 */
2504 hdr = (struct ieee802_1x_hdr *) sm->last_rx_eapol_key;
2505 key = (struct wpa_eapol_key *) (hdr + 1);
2506 mic = (u8 *) (key + 1);
2507 key_data = mic + mic_len + 2;
2508 key_data_length = WPA_GET_BE16(mic + mic_len);
2509 if (key_data_length > sm->last_rx_eapol_key_len - sizeof(*hdr) -
2510 sizeof(*key) - mic_len - 2)
2511 return;
2512
2513 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
2514 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
2515 "received EAPOL-Key msg 2/4 with invalid Key Data contents");
2516 return;
2517 }
2518 if (kde.rsn_ie) {
2519 eapol_key_ie = kde.rsn_ie;
2520 eapol_key_ie_len = kde.rsn_ie_len;
2521 } else if (kde.osen) {
2522 eapol_key_ie = kde.osen;
2523 eapol_key_ie_len = kde.osen_len;
2524 } else {
2525 eapol_key_ie = kde.wpa_ie;
2526 eapol_key_ie_len = kde.wpa_ie_len;
2527 }
2528 ft = sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt);
2529 if (sm->wpa_ie == NULL ||
2530 wpa_compare_rsn_ie(ft, sm->wpa_ie, sm->wpa_ie_len,
2531 eapol_key_ie, eapol_key_ie_len)) {
2532 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2533 "WPA IE from (Re)AssocReq did not match with msg 2/4");
2534 if (sm->wpa_ie) {
2535 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
2536 sm->wpa_ie, sm->wpa_ie_len);
2537 }
2538 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
2539 eapol_key_ie, eapol_key_ie_len);
2540 /* MLME-DEAUTHENTICATE.request */
2541 wpa_sta_disconnect(wpa_auth, sm->addr);
2542 return;
2543 }
2544 #ifdef CONFIG_IEEE80211R_AP
2545 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
2546 wpa_sta_disconnect(wpa_auth, sm->addr);
2547 return;
2548 }
2549 #endif /* CONFIG_IEEE80211R_AP */
2550 #ifdef CONFIG_P2P
2551 if (kde.ip_addr_req && kde.ip_addr_req[0] &&
2552 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
2553 int idx;
2554 wpa_printf(MSG_DEBUG,
2555 "P2P: IP address requested in EAPOL-Key exchange");
2556 idx = bitfield_get_first_zero(wpa_auth->ip_pool);
2557 if (idx >= 0) {
2558 u32 start = WPA_GET_BE32(wpa_auth->conf.ip_addr_start);
2559 bitfield_set(wpa_auth->ip_pool, idx);
2560 WPA_PUT_BE32(sm->ip_addr, start + idx);
2561 wpa_printf(MSG_DEBUG,
2562 "P2P: Assigned IP address %u.%u.%u.%u to "
2563 MACSTR, sm->ip_addr[0], sm->ip_addr[1],
2564 sm->ip_addr[2], sm->ip_addr[3],
2565 MAC2STR(sm->addr));
2566 }
2567 }
2568 #endif /* CONFIG_P2P */
2569
2570 #ifdef CONFIG_IEEE80211R_AP
2571 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2572 /*
2573 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
2574 * with the value we derived.
2575 */
2576 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
2577 WPA_PMK_NAME_LEN) != 0) {
2578 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2579 "PMKR1Name mismatch in FT 4-way "
2580 "handshake");
2581 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
2582 "Supplicant",
2583 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
2584 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
2585 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
2586 return;
2587 }
2588 }
2589 #endif /* CONFIG_IEEE80211R_AP */
2590
2591 sm->pending_1_of_4_timeout = 0;
2592 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
2593
2594 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2595 /* PSK may have changed from the previous choice, so update
2596 * state machine data based on whatever PSK was selected here.
2597 */
2598 os_memcpy(sm->PMK, pmk, PMK_LEN);
2599 sm->pmk_len = PMK_LEN;
2600 }
2601
2602 sm->MICVerified = TRUE;
2603
2604 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
2605 sm->PTK_valid = TRUE;
2606 }
2607
2608
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING2)2609 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
2610 {
2611 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
2612 sm->TimeoutCtr = 0;
2613 }
2614
2615
2616 #ifdef CONFIG_IEEE80211W
2617
ieee80211w_kde_len(struct wpa_state_machine * sm)2618 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2619 {
2620 if (sm->mgmt_frame_prot) {
2621 size_t len;
2622 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2623 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
2624 }
2625
2626 return 0;
2627 }
2628
2629
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)2630 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2631 {
2632 struct wpa_igtk_kde igtk;
2633 struct wpa_group *gsm = sm->group;
2634 u8 rsc[WPA_KEY_RSC_LEN];
2635 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2636
2637 if (!sm->mgmt_frame_prot)
2638 return pos;
2639
2640 igtk.keyid[0] = gsm->GN_igtk;
2641 igtk.keyid[1] = 0;
2642 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
2643 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
2644 os_memset(igtk.pn, 0, sizeof(igtk.pn));
2645 else
2646 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
2647 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
2648 if (sm->wpa_auth->conf.disable_gtk) {
2649 /*
2650 * Provide unique random IGTK to each STA to prevent use of
2651 * IGTK in the BSS.
2652 */
2653 if (random_get_bytes(igtk.igtk, len) < 0)
2654 return pos;
2655 }
2656 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
2657 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
2658 NULL, 0);
2659
2660 return pos;
2661 }
2662
2663 #else /* CONFIG_IEEE80211W */
2664
ieee80211w_kde_len(struct wpa_state_machine * sm)2665 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2666 {
2667 return 0;
2668 }
2669
2670
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)2671 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2672 {
2673 return pos;
2674 }
2675
2676 #endif /* CONFIG_IEEE80211W */
2677
2678
SM_STATE(WPA_PTK,PTKINITNEGOTIATING)2679 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
2680 {
2681 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
2682 size_t gtk_len, kde_len;
2683 struct wpa_group *gsm = sm->group;
2684 u8 *wpa_ie;
2685 int wpa_ie_len, secure, keyidx, encr = 0;
2686
2687 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
2688 sm->TimeoutEvt = FALSE;
2689
2690 sm->TimeoutCtr++;
2691 if (sm->TimeoutCtr > sm->wpa_auth->conf.wpa_pairwise_update_count) {
2692 /* No point in sending the EAPOL-Key - we will disconnect
2693 * immediately following this. */
2694 return;
2695 }
2696
2697 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
2698 GTK[GN], IGTK, [FTIE], [TIE * 2])
2699 */
2700 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2701 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2702 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
2703 wpa_ie = sm->wpa_auth->wpa_ie;
2704 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
2705 if (sm->wpa == WPA_VERSION_WPA &&
2706 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
2707 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
2708 /* WPA-only STA, remove RSN IE and possible MDIE */
2709 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2710 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
2711 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2712 wpa_ie_len = wpa_ie[1] + 2;
2713 }
2714 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2715 "sending 3/4 msg of 4-Way Handshake");
2716 if (sm->wpa == WPA_VERSION_WPA2) {
2717 /* WPA2 send GTK in the 4-way handshake */
2718 secure = 1;
2719 gtk = gsm->GTK[gsm->GN - 1];
2720 gtk_len = gsm->GTK_len;
2721 if (sm->wpa_auth->conf.disable_gtk) {
2722 /*
2723 * Provide unique random GTK to each STA to prevent use
2724 * of GTK in the BSS.
2725 */
2726 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2727 return;
2728 gtk = dummy_gtk;
2729 }
2730 keyidx = gsm->GN;
2731 _rsc = rsc;
2732 encr = 1;
2733 } else {
2734 /* WPA does not include GTK in msg 3/4 */
2735 secure = 0;
2736 gtk = NULL;
2737 gtk_len = 0;
2738 keyidx = 0;
2739 _rsc = NULL;
2740 if (sm->rx_eapol_key_secure) {
2741 /*
2742 * It looks like Windows 7 supplicant tries to use
2743 * Secure bit in msg 2/4 after having reported Michael
2744 * MIC failure and it then rejects the 4-way handshake
2745 * if msg 3/4 does not set Secure bit. Work around this
2746 * by setting the Secure bit here even in the case of
2747 * WPA if the supplicant used it first.
2748 */
2749 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2750 "STA used Secure bit in WPA msg 2/4 - "
2751 "set Secure for 3/4 as workaround");
2752 secure = 1;
2753 }
2754 }
2755
2756 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2757 if (gtk)
2758 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2759 #ifdef CONFIG_IEEE80211R_AP
2760 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2761 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2762 kde_len += 300; /* FTIE + 2 * TIE */
2763 }
2764 #endif /* CONFIG_IEEE80211R_AP */
2765 #ifdef CONFIG_P2P
2766 if (WPA_GET_BE32(sm->ip_addr) > 0)
2767 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2768 #endif /* CONFIG_P2P */
2769 kde = os_malloc(kde_len);
2770 if (kde == NULL)
2771 return;
2772
2773 pos = kde;
2774 os_memcpy(pos, wpa_ie, wpa_ie_len);
2775 pos += wpa_ie_len;
2776 #ifdef CONFIG_IEEE80211R_AP
2777 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2778 int res;
2779 size_t elen;
2780
2781 elen = pos - kde;
2782 res = wpa_insert_pmkid(kde, &elen, sm->pmk_r1_name);
2783 if (res < 0) {
2784 wpa_printf(MSG_ERROR, "FT: Failed to insert "
2785 "PMKR1Name into RSN IE in EAPOL-Key data");
2786 os_free(kde);
2787 return;
2788 }
2789 pos -= wpa_ie_len;
2790 pos += elen;
2791 }
2792 #endif /* CONFIG_IEEE80211R_AP */
2793 if (gtk) {
2794 u8 hdr[2];
2795 hdr[0] = keyidx & 0x03;
2796 hdr[1] = 0;
2797 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2798 gtk, gtk_len);
2799 }
2800 pos = ieee80211w_kde_add(sm, pos);
2801
2802 #ifdef CONFIG_IEEE80211R_AP
2803 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2804 int res;
2805 struct wpa_auth_config *conf;
2806
2807 conf = &sm->wpa_auth->conf;
2808 if (sm->assoc_resp_ftie &&
2809 kde + kde_len - pos >= 2 + sm->assoc_resp_ftie[1]) {
2810 os_memcpy(pos, sm->assoc_resp_ftie,
2811 2 + sm->assoc_resp_ftie[1]);
2812 res = 2 + sm->assoc_resp_ftie[1];
2813 } else {
2814 res = wpa_write_ftie(conf, conf->r0_key_holder,
2815 conf->r0_key_holder_len,
2816 NULL, NULL, pos,
2817 kde + kde_len - pos,
2818 NULL, 0);
2819 }
2820 if (res < 0) {
2821 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2822 "into EAPOL-Key Key Data");
2823 os_free(kde);
2824 return;
2825 }
2826 pos += res;
2827
2828 /* TIE[ReassociationDeadline] (TU) */
2829 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2830 *pos++ = 5;
2831 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2832 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2833 pos += 4;
2834
2835 /* TIE[KeyLifetime] (seconds) */
2836 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2837 *pos++ = 5;
2838 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2839 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2840 pos += 4;
2841 }
2842 #endif /* CONFIG_IEEE80211R_AP */
2843 #ifdef CONFIG_P2P
2844 if (WPA_GET_BE32(sm->ip_addr) > 0) {
2845 u8 addr[3 * 4];
2846 os_memcpy(addr, sm->ip_addr, 4);
2847 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2848 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2849 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2850 addr, sizeof(addr), NULL, 0);
2851 }
2852 #endif /* CONFIG_P2P */
2853
2854 wpa_send_eapol(sm->wpa_auth, sm,
2855 (secure ? WPA_KEY_INFO_SECURE : 0) |
2856 (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
2857 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2858 WPA_KEY_INFO_KEY_TYPE,
2859 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2860 os_free(kde);
2861 }
2862
2863
SM_STATE(WPA_PTK,PTKINITDONE)2864 SM_STATE(WPA_PTK, PTKINITDONE)
2865 {
2866 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2867 sm->EAPOLKeyReceived = FALSE;
2868 if (sm->Pair) {
2869 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2870 int klen = wpa_cipher_key_len(sm->pairwise);
2871 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2872 sm->PTK.tk, klen)) {
2873 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2874 return;
2875 }
2876 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2877 sm->pairwise_set = TRUE;
2878
2879 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2880 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2881 eloop_register_timeout(sm->wpa_auth->conf.
2882 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2883 sm->wpa_auth, sm);
2884 }
2885
2886 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2887 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2888 WPA_EAPOL_authorized, 1);
2889 }
2890 }
2891
2892 if (0 /* IBSS == TRUE */) {
2893 sm->keycount++;
2894 if (sm->keycount == 2) {
2895 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2896 WPA_EAPOL_portValid, 1);
2897 }
2898 } else {
2899 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2900 1);
2901 }
2902 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2903 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2904 if (sm->wpa == WPA_VERSION_WPA)
2905 sm->PInitAKeys = TRUE;
2906 else
2907 sm->has_GTK = TRUE;
2908 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2909 "pairwise key handshake completed (%s)",
2910 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2911
2912 #ifdef CONFIG_IEEE80211R_AP
2913 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2914 #endif /* CONFIG_IEEE80211R_AP */
2915 }
2916
2917
SM_STEP(WPA_PTK)2918 SM_STEP(WPA_PTK)
2919 {
2920 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2921
2922 if (sm->Init)
2923 SM_ENTER(WPA_PTK, INITIALIZE);
2924 else if (sm->Disconnect
2925 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2926 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2927 "WPA_PTK: sm->Disconnect");
2928 SM_ENTER(WPA_PTK, DISCONNECT);
2929 }
2930 else if (sm->DeauthenticationRequest)
2931 SM_ENTER(WPA_PTK, DISCONNECTED);
2932 else if (sm->AuthenticationRequest)
2933 SM_ENTER(WPA_PTK, AUTHENTICATION);
2934 else if (sm->ReAuthenticationRequest)
2935 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2936 else if (sm->PTKRequest)
2937 SM_ENTER(WPA_PTK, PTKSTART);
2938 else switch (sm->wpa_ptk_state) {
2939 case WPA_PTK_INITIALIZE:
2940 break;
2941 case WPA_PTK_DISCONNECT:
2942 SM_ENTER(WPA_PTK, DISCONNECTED);
2943 break;
2944 case WPA_PTK_DISCONNECTED:
2945 SM_ENTER(WPA_PTK, INITIALIZE);
2946 break;
2947 case WPA_PTK_AUTHENTICATION:
2948 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2949 break;
2950 case WPA_PTK_AUTHENTICATION2:
2951 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2952 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2953 WPA_EAPOL_keyRun) > 0)
2954 SM_ENTER(WPA_PTK, INITPMK);
2955 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2956 /* FIX: && 802.1X::keyRun */)
2957 SM_ENTER(WPA_PTK, INITPSK);
2958 break;
2959 case WPA_PTK_INITPMK:
2960 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2961 WPA_EAPOL_keyAvailable) > 0)
2962 SM_ENTER(WPA_PTK, PTKSTART);
2963 else {
2964 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2965 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2966 "INITPMK - keyAvailable = false");
2967 SM_ENTER(WPA_PTK, DISCONNECT);
2968 }
2969 break;
2970 case WPA_PTK_INITPSK:
2971 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2972 NULL))
2973 SM_ENTER(WPA_PTK, PTKSTART);
2974 else {
2975 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2976 "no PSK configured for the STA");
2977 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2978 SM_ENTER(WPA_PTK, DISCONNECT);
2979 }
2980 break;
2981 case WPA_PTK_PTKSTART:
2982 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2983 sm->EAPOLKeyPairwise)
2984 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2985 else if (sm->TimeoutCtr >
2986 sm->wpa_auth->conf.wpa_pairwise_update_count) {
2987 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2988 wpa_auth_vlogger(
2989 sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2990 "PTKSTART: Retry limit %u reached",
2991 sm->wpa_auth->conf.wpa_pairwise_update_count);
2992 SM_ENTER(WPA_PTK, DISCONNECT);
2993 } else if (sm->TimeoutEvt)
2994 SM_ENTER(WPA_PTK, PTKSTART);
2995 break;
2996 case WPA_PTK_PTKCALCNEGOTIATING:
2997 if (sm->MICVerified)
2998 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2999 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3000 sm->EAPOLKeyPairwise)
3001 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3002 else if (sm->TimeoutEvt)
3003 SM_ENTER(WPA_PTK, PTKSTART);
3004 break;
3005 case WPA_PTK_PTKCALCNEGOTIATING2:
3006 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3007 break;
3008 case WPA_PTK_PTKINITNEGOTIATING:
3009 if (sm->update_snonce)
3010 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3011 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3012 sm->EAPOLKeyPairwise && sm->MICVerified)
3013 SM_ENTER(WPA_PTK, PTKINITDONE);
3014 else if (sm->TimeoutCtr >
3015 sm->wpa_auth->conf.wpa_pairwise_update_count) {
3016 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3017 wpa_auth_vlogger(
3018 sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3019 "PTKINITNEGOTIATING: Retry limit %u reached",
3020 sm->wpa_auth->conf.wpa_pairwise_update_count);
3021 SM_ENTER(WPA_PTK, DISCONNECT);
3022 } else if (sm->TimeoutEvt)
3023 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3024 break;
3025 case WPA_PTK_PTKINITDONE:
3026 break;
3027 }
3028 }
3029
3030
SM_STATE(WPA_PTK_GROUP,IDLE)3031 SM_STATE(WPA_PTK_GROUP, IDLE)
3032 {
3033 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
3034 if (sm->Init) {
3035 /* Init flag is not cleared here, so avoid busy
3036 * loop by claiming nothing changed. */
3037 sm->changed = FALSE;
3038 }
3039 sm->GTimeoutCtr = 0;
3040 }
3041
3042
SM_STATE(WPA_PTK_GROUP,REKEYNEGOTIATING)3043 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
3044 {
3045 u8 rsc[WPA_KEY_RSC_LEN];
3046 struct wpa_group *gsm = sm->group;
3047 const u8 *kde;
3048 u8 *kde_buf = NULL, *pos, hdr[2];
3049 size_t kde_len;
3050 u8 *gtk, dummy_gtk[32];
3051
3052 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
3053
3054 sm->GTimeoutCtr++;
3055 if (sm->GTimeoutCtr > sm->wpa_auth->conf.wpa_group_update_count) {
3056 /* No point in sending the EAPOL-Key - we will disconnect
3057 * immediately following this. */
3058 return;
3059 }
3060
3061 if (sm->wpa == WPA_VERSION_WPA)
3062 sm->PInitAKeys = FALSE;
3063 sm->TimeoutEvt = FALSE;
3064 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
3065 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
3066 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
3067 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
3068 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3069 "sending 1/2 msg of Group Key Handshake");
3070
3071 gtk = gsm->GTK[gsm->GN - 1];
3072 if (sm->wpa_auth->conf.disable_gtk) {
3073 /*
3074 * Provide unique random GTK to each STA to prevent use
3075 * of GTK in the BSS.
3076 */
3077 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
3078 return;
3079 gtk = dummy_gtk;
3080 }
3081 if (sm->wpa == WPA_VERSION_WPA2) {
3082 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
3083 ieee80211w_kde_len(sm);
3084 kde_buf = os_malloc(kde_len);
3085 if (kde_buf == NULL)
3086 return;
3087
3088 kde = pos = kde_buf;
3089 hdr[0] = gsm->GN & 0x03;
3090 hdr[1] = 0;
3091 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
3092 gtk, gsm->GTK_len);
3093 pos = ieee80211w_kde_add(sm, pos);
3094 kde_len = pos - kde;
3095 } else {
3096 kde = gtk;
3097 kde_len = gsm->GTK_len;
3098 }
3099
3100 wpa_send_eapol(sm->wpa_auth, sm,
3101 WPA_KEY_INFO_SECURE |
3102 (wpa_mic_len(sm->wpa_key_mgmt) ? WPA_KEY_INFO_MIC : 0) |
3103 WPA_KEY_INFO_ACK |
3104 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
3105 rsc, NULL, kde, kde_len, gsm->GN, 1);
3106
3107 os_free(kde_buf);
3108 }
3109
3110
SM_STATE(WPA_PTK_GROUP,REKEYESTABLISHED)3111 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
3112 {
3113 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
3114 sm->EAPOLKeyReceived = FALSE;
3115 if (sm->GUpdateStationKeys)
3116 sm->group->GKeyDoneStations--;
3117 sm->GUpdateStationKeys = FALSE;
3118 sm->GTimeoutCtr = 0;
3119 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
3120 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3121 "group key handshake completed (%s)",
3122 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
3123 sm->has_GTK = TRUE;
3124 }
3125
3126
SM_STATE(WPA_PTK_GROUP,KEYERROR)3127 SM_STATE(WPA_PTK_GROUP, KEYERROR)
3128 {
3129 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
3130 if (sm->GUpdateStationKeys)
3131 sm->group->GKeyDoneStations--;
3132 sm->GUpdateStationKeys = FALSE;
3133 sm->Disconnect = TRUE;
3134 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3135 "group key handshake failed (%s) after %u tries",
3136 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN",
3137 sm->wpa_auth->conf.wpa_group_update_count);
3138 }
3139
3140
SM_STEP(WPA_PTK_GROUP)3141 SM_STEP(WPA_PTK_GROUP)
3142 {
3143 if (sm->Init || sm->PtkGroupInit) {
3144 SM_ENTER(WPA_PTK_GROUP, IDLE);
3145 sm->PtkGroupInit = FALSE;
3146 } else switch (sm->wpa_ptk_group_state) {
3147 case WPA_PTK_GROUP_IDLE:
3148 if (sm->GUpdateStationKeys ||
3149 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
3150 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3151 break;
3152 case WPA_PTK_GROUP_REKEYNEGOTIATING:
3153 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3154 !sm->EAPOLKeyPairwise && sm->MICVerified)
3155 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
3156 else if (sm->GTimeoutCtr >
3157 sm->wpa_auth->conf.wpa_group_update_count)
3158 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
3159 else if (sm->TimeoutEvt)
3160 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3161 break;
3162 case WPA_PTK_GROUP_KEYERROR:
3163 SM_ENTER(WPA_PTK_GROUP, IDLE);
3164 break;
3165 case WPA_PTK_GROUP_REKEYESTABLISHED:
3166 SM_ENTER(WPA_PTK_GROUP, IDLE);
3167 break;
3168 }
3169 }
3170
3171
wpa_gtk_update(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3172 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
3173 struct wpa_group *group)
3174 {
3175 int ret = 0;
3176
3177 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3178 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3179 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
3180 wpa_auth->addr, group->GNonce,
3181 group->GTK[group->GN - 1], group->GTK_len) < 0)
3182 ret = -1;
3183 wpa_hexdump_key(MSG_DEBUG, "GTK",
3184 group->GTK[group->GN - 1], group->GTK_len);
3185
3186 #ifdef CONFIG_IEEE80211W
3187 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3188 size_t len;
3189 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3190 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3191 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3192 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
3193 wpa_auth->addr, group->GNonce,
3194 group->IGTK[group->GN_igtk - 4], len) < 0)
3195 ret = -1;
3196 wpa_hexdump_key(MSG_DEBUG, "IGTK",
3197 group->IGTK[group->GN_igtk - 4], len);
3198 }
3199 #endif /* CONFIG_IEEE80211W */
3200
3201 return ret;
3202 }
3203
3204
wpa_group_gtk_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3205 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
3206 struct wpa_group *group)
3207 {
3208 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3209 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
3210 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
3211 group->wpa_group_state = WPA_GROUP_GTK_INIT;
3212
3213 /* GTK[0..N] = 0 */
3214 os_memset(group->GTK, 0, sizeof(group->GTK));
3215 group->GN = 1;
3216 group->GM = 2;
3217 #ifdef CONFIG_IEEE80211W
3218 group->GN_igtk = 4;
3219 group->GM_igtk = 5;
3220 #endif /* CONFIG_IEEE80211W */
3221 /* GTK[GN] = CalcGTK() */
3222 wpa_gtk_update(wpa_auth, group);
3223 }
3224
3225
wpa_group_update_sta(struct wpa_state_machine * sm,void * ctx)3226 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
3227 {
3228 if (ctx != NULL && ctx != sm->group)
3229 return 0;
3230
3231 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
3232 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3233 "Not in PTKINITDONE; skip Group Key update");
3234 sm->GUpdateStationKeys = FALSE;
3235 return 0;
3236 }
3237 if (sm->GUpdateStationKeys) {
3238 /*
3239 * This should not really happen, so add a debug log entry.
3240 * Since we clear the GKeyDoneStations before the loop, the
3241 * station needs to be counted here anyway.
3242 */
3243 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3244 "GUpdateStationKeys was already set when "
3245 "marking station for GTK rekeying");
3246 }
3247
3248 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
3249 if (sm->is_wnmsleep)
3250 return 0;
3251
3252 sm->group->GKeyDoneStations++;
3253 sm->GUpdateStationKeys = TRUE;
3254
3255 wpa_sm_step(sm);
3256 return 0;
3257 }
3258
3259
3260 #ifdef CONFIG_WNM
3261 /* update GTK when exiting WNM-Sleep Mode */
wpa_wnmsleep_rekey_gtk(struct wpa_state_machine * sm)3262 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
3263 {
3264 if (sm == NULL || sm->is_wnmsleep)
3265 return;
3266
3267 wpa_group_update_sta(sm, NULL);
3268 }
3269
3270
wpa_set_wnmsleep(struct wpa_state_machine * sm,int flag)3271 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
3272 {
3273 if (sm)
3274 sm->is_wnmsleep = !!flag;
3275 }
3276
3277
wpa_wnmsleep_gtk_subelem(struct wpa_state_machine * sm,u8 * pos)3278 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3279 {
3280 struct wpa_group *gsm = sm->group;
3281 u8 *start = pos;
3282
3283 /*
3284 * GTK subelement:
3285 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
3286 * Key[5..32]
3287 */
3288 *pos++ = WNM_SLEEP_SUBELEM_GTK;
3289 *pos++ = 11 + gsm->GTK_len;
3290 /* Key ID in B0-B1 of Key Info */
3291 WPA_PUT_LE16(pos, gsm->GN & 0x03);
3292 pos += 2;
3293 *pos++ = gsm->GTK_len;
3294 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
3295 return 0;
3296 pos += 8;
3297 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3298 pos += gsm->GTK_len;
3299
3300 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
3301 gsm->GN);
3302 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
3303 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3304
3305 return pos - start;
3306 }
3307
3308
3309 #ifdef CONFIG_IEEE80211W
wpa_wnmsleep_igtk_subelem(struct wpa_state_machine * sm,u8 * pos)3310 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3311 {
3312 struct wpa_group *gsm = sm->group;
3313 u8 *start = pos;
3314 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
3315
3316 /*
3317 * IGTK subelement:
3318 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
3319 */
3320 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
3321 *pos++ = 2 + 6 + len;
3322 WPA_PUT_LE16(pos, gsm->GN_igtk);
3323 pos += 2;
3324 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
3325 return 0;
3326 pos += 6;
3327
3328 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
3329 pos += len;
3330
3331 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
3332 gsm->GN_igtk);
3333 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
3334 gsm->IGTK[gsm->GN_igtk - 4], len);
3335
3336 return pos - start;
3337 }
3338 #endif /* CONFIG_IEEE80211W */
3339 #endif /* CONFIG_WNM */
3340
3341
wpa_group_setkeys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3342 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
3343 struct wpa_group *group)
3344 {
3345 int tmp;
3346
3347 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3348 "SETKEYS (VLAN-ID %d)", group->vlan_id);
3349 group->changed = TRUE;
3350 group->wpa_group_state = WPA_GROUP_SETKEYS;
3351 group->GTKReKey = FALSE;
3352 tmp = group->GM;
3353 group->GM = group->GN;
3354 group->GN = tmp;
3355 #ifdef CONFIG_IEEE80211W
3356 tmp = group->GM_igtk;
3357 group->GM_igtk = group->GN_igtk;
3358 group->GN_igtk = tmp;
3359 #endif /* CONFIG_IEEE80211W */
3360 /* "GKeyDoneStations = GNoStations" is done in more robust way by
3361 * counting the STAs that are marked with GUpdateStationKeys instead of
3362 * including all STAs that could be in not-yet-completed state. */
3363 wpa_gtk_update(wpa_auth, group);
3364
3365 if (group->GKeyDoneStations) {
3366 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
3367 "GKeyDoneStations=%d when starting new GTK rekey",
3368 group->GKeyDoneStations);
3369 group->GKeyDoneStations = 0;
3370 }
3371 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
3372 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
3373 group->GKeyDoneStations);
3374 }
3375
3376
wpa_group_config_group_keys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3377 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
3378 struct wpa_group *group)
3379 {
3380 int ret = 0;
3381
3382 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
3383 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
3384 broadcast_ether_addr, group->GN,
3385 group->GTK[group->GN - 1], group->GTK_len) < 0)
3386 ret = -1;
3387
3388 #ifdef CONFIG_IEEE80211W
3389 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3390 enum wpa_alg alg;
3391 size_t len;
3392
3393 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
3394 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3395
3396 if (ret == 0 &&
3397 wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
3398 broadcast_ether_addr, group->GN_igtk,
3399 group->IGTK[group->GN_igtk - 4], len) < 0)
3400 ret = -1;
3401 }
3402 #endif /* CONFIG_IEEE80211W */
3403
3404 return ret;
3405 }
3406
3407
wpa_group_disconnect_cb(struct wpa_state_machine * sm,void * ctx)3408 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
3409 {
3410 if (sm->group == ctx) {
3411 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
3412 " for discconnection due to fatal failure",
3413 MAC2STR(sm->addr));
3414 sm->Disconnect = TRUE;
3415 }
3416
3417 return 0;
3418 }
3419
3420
wpa_group_fatal_failure(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3421 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
3422 struct wpa_group *group)
3423 {
3424 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
3425 group->changed = TRUE;
3426 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
3427 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
3428 }
3429
3430
wpa_group_setkeysdone(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3431 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
3432 struct wpa_group *group)
3433 {
3434 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3435 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
3436 group->changed = TRUE;
3437 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
3438
3439 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
3440 wpa_group_fatal_failure(wpa_auth, group);
3441 return -1;
3442 }
3443
3444 return 0;
3445 }
3446
3447
wpa_group_sm_step(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3448 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
3449 struct wpa_group *group)
3450 {
3451 if (group->GInit) {
3452 wpa_group_gtk_init(wpa_auth, group);
3453 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
3454 /* Do not allow group operations */
3455 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
3456 group->GTKAuthenticator) {
3457 wpa_group_setkeysdone(wpa_auth, group);
3458 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
3459 group->GTKReKey) {
3460 wpa_group_setkeys(wpa_auth, group);
3461 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
3462 if (group->GKeyDoneStations == 0)
3463 wpa_group_setkeysdone(wpa_auth, group);
3464 else if (group->GTKReKey)
3465 wpa_group_setkeys(wpa_auth, group);
3466 }
3467 }
3468
3469
wpa_sm_step(struct wpa_state_machine * sm)3470 static int wpa_sm_step(struct wpa_state_machine *sm)
3471 {
3472 if (sm == NULL)
3473 return 0;
3474
3475 if (sm->in_step_loop) {
3476 /* This should not happen, but if it does, make sure we do not
3477 * end up freeing the state machine too early by exiting the
3478 * recursive call. */
3479 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
3480 return 0;
3481 }
3482
3483 sm->in_step_loop = 1;
3484 do {
3485 if (sm->pending_deinit)
3486 break;
3487
3488 sm->changed = FALSE;
3489 sm->wpa_auth->group->changed = FALSE;
3490
3491 SM_STEP_RUN(WPA_PTK);
3492 if (sm->pending_deinit)
3493 break;
3494 SM_STEP_RUN(WPA_PTK_GROUP);
3495 if (sm->pending_deinit)
3496 break;
3497 wpa_group_sm_step(sm->wpa_auth, sm->group);
3498 } while (sm->changed || sm->wpa_auth->group->changed);
3499 sm->in_step_loop = 0;
3500
3501 if (sm->pending_deinit) {
3502 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
3503 "machine deinit for " MACSTR, MAC2STR(sm->addr));
3504 wpa_free_sta_sm(sm);
3505 return 1;
3506 }
3507 return 0;
3508 }
3509
3510
wpa_sm_call_step(void * eloop_ctx,void * timeout_ctx)3511 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
3512 {
3513 struct wpa_state_machine *sm = eloop_ctx;
3514 wpa_sm_step(sm);
3515 }
3516
3517
wpa_auth_sm_notify(struct wpa_state_machine * sm)3518 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
3519 {
3520 if (sm == NULL)
3521 return;
3522 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
3523 }
3524
3525
wpa_gtk_rekey(struct wpa_authenticator * wpa_auth)3526 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
3527 {
3528 int tmp, i;
3529 struct wpa_group *group;
3530
3531 if (wpa_auth == NULL)
3532 return;
3533
3534 group = wpa_auth->group;
3535
3536 for (i = 0; i < 2; i++) {
3537 tmp = group->GM;
3538 group->GM = group->GN;
3539 group->GN = tmp;
3540 #ifdef CONFIG_IEEE80211W
3541 tmp = group->GM_igtk;
3542 group->GM_igtk = group->GN_igtk;
3543 group->GN_igtk = tmp;
3544 #endif /* CONFIG_IEEE80211W */
3545 wpa_gtk_update(wpa_auth, group);
3546 wpa_group_config_group_keys(wpa_auth, group);
3547 }
3548 }
3549
3550
wpa_bool_txt(int val)3551 static const char * wpa_bool_txt(int val)
3552 {
3553 return val ? "TRUE" : "FALSE";
3554 }
3555
3556
3557 #define RSN_SUITE "%02x-%02x-%02x-%d"
3558 #define RSN_SUITE_ARG(s) \
3559 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
3560
wpa_get_mib(struct wpa_authenticator * wpa_auth,char * buf,size_t buflen)3561 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
3562 {
3563 int len = 0, ret;
3564 char pmkid_txt[PMKID_LEN * 2 + 1];
3565 #ifdef CONFIG_RSN_PREAUTH
3566 const int preauth = 1;
3567 #else /* CONFIG_RSN_PREAUTH */
3568 const int preauth = 0;
3569 #endif /* CONFIG_RSN_PREAUTH */
3570
3571 if (wpa_auth == NULL)
3572 return len;
3573
3574 ret = os_snprintf(buf + len, buflen - len,
3575 "dot11RSNAOptionImplemented=TRUE\n"
3576 "dot11RSNAPreauthenticationImplemented=%s\n"
3577 "dot11RSNAEnabled=%s\n"
3578 "dot11RSNAPreauthenticationEnabled=%s\n",
3579 wpa_bool_txt(preauth),
3580 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
3581 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
3582 if (os_snprintf_error(buflen - len, ret))
3583 return len;
3584 len += ret;
3585
3586 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
3587 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
3588
3589 ret = os_snprintf(
3590 buf + len, buflen - len,
3591 "dot11RSNAConfigVersion=%u\n"
3592 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
3593 /* FIX: dot11RSNAConfigGroupCipher */
3594 /* FIX: dot11RSNAConfigGroupRekeyMethod */
3595 /* FIX: dot11RSNAConfigGroupRekeyTime */
3596 /* FIX: dot11RSNAConfigGroupRekeyPackets */
3597 "dot11RSNAConfigGroupRekeyStrict=%u\n"
3598 "dot11RSNAConfigGroupUpdateCount=%u\n"
3599 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
3600 "dot11RSNAConfigGroupCipherSize=%u\n"
3601 "dot11RSNAConfigPMKLifetime=%u\n"
3602 "dot11RSNAConfigPMKReauthThreshold=%u\n"
3603 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
3604 "dot11RSNAConfigSATimeout=%u\n"
3605 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
3606 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
3607 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
3608 "dot11RSNAPMKIDUsed=%s\n"
3609 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
3610 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
3611 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
3612 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
3613 "dot11RSNA4WayHandshakeFailures=%u\n"
3614 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
3615 RSN_VERSION,
3616 !!wpa_auth->conf.wpa_strict_rekey,
3617 wpa_auth->conf.wpa_group_update_count,
3618 wpa_auth->conf.wpa_pairwise_update_count,
3619 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
3620 dot11RSNAConfigPMKLifetime,
3621 dot11RSNAConfigPMKReauthThreshold,
3622 dot11RSNAConfigSATimeout,
3623 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
3624 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
3625 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
3626 pmkid_txt,
3627 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
3628 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
3629 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
3630 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
3631 wpa_auth->dot11RSNA4WayHandshakeFailures);
3632 if (os_snprintf_error(buflen - len, ret))
3633 return len;
3634 len += ret;
3635
3636 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
3637 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
3638
3639 /* Private MIB */
3640 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
3641 wpa_auth->group->wpa_group_state);
3642 if (os_snprintf_error(buflen - len, ret))
3643 return len;
3644 len += ret;
3645
3646 return len;
3647 }
3648
3649
wpa_get_mib_sta(struct wpa_state_machine * sm,char * buf,size_t buflen)3650 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
3651 {
3652 int len = 0, ret;
3653 u32 pairwise = 0;
3654
3655 if (sm == NULL)
3656 return 0;
3657
3658 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
3659
3660 /* dot11RSNAStatsEntry */
3661
3662 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
3663 WPA_PROTO_RSN : WPA_PROTO_WPA,
3664 sm->pairwise);
3665 if (pairwise == 0)
3666 return 0;
3667
3668 ret = os_snprintf(
3669 buf + len, buflen - len,
3670 /* TODO: dot11RSNAStatsIndex */
3671 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
3672 "dot11RSNAStatsVersion=1\n"
3673 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
3674 /* TODO: dot11RSNAStatsTKIPICVErrors */
3675 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
3676 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
3677 /* TODO: dot11RSNAStatsCCMPReplays */
3678 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
3679 /* TODO: dot11RSNAStatsTKIPReplays */,
3680 MAC2STR(sm->addr),
3681 RSN_SUITE_ARG(pairwise),
3682 sm->dot11RSNAStatsTKIPLocalMICFailures,
3683 sm->dot11RSNAStatsTKIPRemoteMICFailures);
3684 if (os_snprintf_error(buflen - len, ret))
3685 return len;
3686 len += ret;
3687
3688 /* Private MIB */
3689 ret = os_snprintf(buf + len, buflen - len,
3690 "hostapdWPAPTKState=%d\n"
3691 "hostapdWPAPTKGroupState=%d\n",
3692 sm->wpa_ptk_state,
3693 sm->wpa_ptk_group_state);
3694 if (os_snprintf_error(buflen - len, ret))
3695 return len;
3696 len += ret;
3697
3698 return len;
3699 }
3700
3701
wpa_auth_countermeasures_start(struct wpa_authenticator * wpa_auth)3702 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
3703 {
3704 if (wpa_auth)
3705 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
3706 }
3707
3708
wpa_auth_pairwise_set(struct wpa_state_machine * sm)3709 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
3710 {
3711 return sm && sm->pairwise_set;
3712 }
3713
3714
wpa_auth_get_pairwise(struct wpa_state_machine * sm)3715 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
3716 {
3717 return sm->pairwise;
3718 }
3719
3720
wpa_auth_sta_key_mgmt(struct wpa_state_machine * sm)3721 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
3722 {
3723 if (sm == NULL)
3724 return -1;
3725 return sm->wpa_key_mgmt;
3726 }
3727
3728
wpa_auth_sta_wpa_version(struct wpa_state_machine * sm)3729 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
3730 {
3731 if (sm == NULL)
3732 return 0;
3733 return sm->wpa;
3734 }
3735
3736
wpa_auth_sta_clear_pmksa(struct wpa_state_machine * sm,struct rsn_pmksa_cache_entry * entry)3737 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
3738 struct rsn_pmksa_cache_entry *entry)
3739 {
3740 if (sm == NULL || sm->pmksa != entry)
3741 return -1;
3742 sm->pmksa = NULL;
3743 return 0;
3744 }
3745
3746
3747 struct rsn_pmksa_cache_entry *
wpa_auth_sta_get_pmksa(struct wpa_state_machine * sm)3748 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3749 {
3750 return sm ? sm->pmksa : NULL;
3751 }
3752
3753
wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine * sm)3754 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3755 {
3756 if (sm)
3757 sm->dot11RSNAStatsTKIPLocalMICFailures++;
3758 }
3759
3760
wpa_auth_get_wpa_ie(struct wpa_authenticator * wpa_auth,size_t * len)3761 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3762 {
3763 if (wpa_auth == NULL)
3764 return NULL;
3765 *len = wpa_auth->wpa_ie_len;
3766 return wpa_auth->wpa_ie;
3767 }
3768
3769
wpa_auth_pmksa_add(struct wpa_state_machine * sm,const u8 * pmk,unsigned int pmk_len,int session_timeout,struct eapol_state_machine * eapol)3770 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3771 unsigned int pmk_len,
3772 int session_timeout, struct eapol_state_machine *eapol)
3773 {
3774 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3775 sm->wpa_auth->conf.disable_pmksa_caching)
3776 return -1;
3777
3778 if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) {
3779 if (pmk_len > PMK_LEN_SUITE_B_192)
3780 pmk_len = PMK_LEN_SUITE_B_192;
3781 } else if (pmk_len > PMK_LEN) {
3782 pmk_len = PMK_LEN;
3783 }
3784
3785 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, pmk_len, NULL,
3786 sm->PTK.kck, sm->PTK.kck_len,
3787 sm->wpa_auth->addr, sm->addr, session_timeout,
3788 eapol, sm->wpa_key_mgmt))
3789 return 0;
3790
3791 return -1;
3792 }
3793
3794
wpa_auth_pmksa_add_preauth(struct wpa_authenticator * wpa_auth,const u8 * pmk,size_t len,const u8 * sta_addr,int session_timeout,struct eapol_state_machine * eapol)3795 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3796 const u8 *pmk, size_t len, const u8 *sta_addr,
3797 int session_timeout,
3798 struct eapol_state_machine *eapol)
3799 {
3800 if (wpa_auth == NULL)
3801 return -1;
3802
3803 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, NULL,
3804 NULL, 0,
3805 wpa_auth->addr,
3806 sta_addr, session_timeout, eapol,
3807 WPA_KEY_MGMT_IEEE8021X))
3808 return 0;
3809
3810 return -1;
3811 }
3812
3813
wpa_auth_pmksa_add_sae(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * pmk,const u8 * pmkid)3814 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr,
3815 const u8 *pmk, const u8 *pmkid)
3816 {
3817 if (wpa_auth->conf.disable_pmksa_caching)
3818 return -1;
3819
3820 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, pmkid,
3821 NULL, 0,
3822 wpa_auth->addr, addr, 0, NULL,
3823 WPA_KEY_MGMT_SAE))
3824 return 0;
3825
3826 return -1;
3827 }
3828
3829
wpa_auth_pmksa_remove(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)3830 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3831 const u8 *sta_addr)
3832 {
3833 struct rsn_pmksa_cache_entry *pmksa;
3834
3835 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3836 return;
3837 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3838 if (pmksa) {
3839 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3840 MACSTR " based on request", MAC2STR(sta_addr));
3841 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3842 }
3843 }
3844
3845
wpa_auth_pmksa_list(struct wpa_authenticator * wpa_auth,char * buf,size_t len)3846 int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
3847 size_t len)
3848 {
3849 if (!wpa_auth || !wpa_auth->pmksa)
3850 return 0;
3851 return pmksa_cache_auth_list(wpa_auth->pmksa, buf, len);
3852 }
3853
3854
wpa_auth_pmksa_flush(struct wpa_authenticator * wpa_auth)3855 void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth)
3856 {
3857 if (wpa_auth && wpa_auth->pmksa)
3858 pmksa_cache_auth_flush(wpa_auth->pmksa);
3859 }
3860
3861
3862 #ifdef CONFIG_PMKSA_CACHE_EXTERNAL
3863 #ifdef CONFIG_MESH
3864
wpa_auth_pmksa_list_mesh(struct wpa_authenticator * wpa_auth,const u8 * addr,char * buf,size_t len)3865 int wpa_auth_pmksa_list_mesh(struct wpa_authenticator *wpa_auth, const u8 *addr,
3866 char *buf, size_t len)
3867 {
3868 if (!wpa_auth || !wpa_auth->pmksa)
3869 return 0;
3870
3871 return pmksa_cache_auth_list_mesh(wpa_auth->pmksa, addr, buf, len);
3872 }
3873
3874
3875 struct rsn_pmksa_cache_entry *
wpa_auth_pmksa_create_entry(const u8 * aa,const u8 * spa,const u8 * pmk,const u8 * pmkid,int expiration)3876 wpa_auth_pmksa_create_entry(const u8 *aa, const u8 *spa, const u8 *pmk,
3877 const u8 *pmkid, int expiration)
3878 {
3879 struct rsn_pmksa_cache_entry *entry;
3880 struct os_reltime now;
3881
3882 entry = pmksa_cache_auth_create_entry(pmk, PMK_LEN, pmkid, NULL, 0, aa,
3883 spa, 0, NULL, WPA_KEY_MGMT_SAE);
3884 if (!entry)
3885 return NULL;
3886
3887 os_get_reltime(&now);
3888 entry->expiration = now.sec + expiration;
3889 return entry;
3890 }
3891
3892
wpa_auth_pmksa_add_entry(struct wpa_authenticator * wpa_auth,struct rsn_pmksa_cache_entry * entry)3893 int wpa_auth_pmksa_add_entry(struct wpa_authenticator *wpa_auth,
3894 struct rsn_pmksa_cache_entry *entry)
3895 {
3896 int ret;
3897
3898 if (!wpa_auth || !wpa_auth->pmksa)
3899 return -1;
3900
3901 ret = pmksa_cache_auth_add_entry(wpa_auth->pmksa, entry);
3902 if (ret < 0)
3903 wpa_printf(MSG_DEBUG,
3904 "RSN: Failed to store external PMKSA cache for "
3905 MACSTR, MAC2STR(entry->spa));
3906
3907 return ret;
3908 }
3909
3910 #endif /* CONFIG_MESH */
3911 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
3912
3913
3914 struct rsn_pmksa_cache_entry *
wpa_auth_pmksa_get(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 * pmkid)3915 wpa_auth_pmksa_get(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
3916 const u8 *pmkid)
3917 {
3918 if (!wpa_auth || !wpa_auth->pmksa)
3919 return NULL;
3920 return pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, pmkid);
3921 }
3922
3923
wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry * pmksa,struct wpa_state_machine * sm,struct wpa_authenticator * wpa_auth,u8 * pmkid,u8 * pmk)3924 void wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry *pmksa,
3925 struct wpa_state_machine *sm,
3926 struct wpa_authenticator *wpa_auth,
3927 u8 *pmkid, u8 *pmk)
3928 {
3929 if (!sm)
3930 return;
3931
3932 sm->pmksa = pmksa;
3933 os_memcpy(pmk, pmksa->pmk, PMK_LEN);
3934 os_memcpy(pmkid, pmksa->pmkid, PMKID_LEN);
3935 os_memcpy(wpa_auth->dot11RSNAPMKIDUsed, pmksa->pmkid, PMKID_LEN);
3936 }
3937
3938
3939 /*
3940 * Remove and free the group from wpa_authenticator. This is triggered by a
3941 * callback to make sure nobody is currently iterating the group list while it
3942 * gets modified.
3943 */
wpa_group_free(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3944 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
3945 struct wpa_group *group)
3946 {
3947 struct wpa_group *prev = wpa_auth->group;
3948
3949 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d",
3950 group->vlan_id);
3951
3952 while (prev) {
3953 if (prev->next == group) {
3954 /* This never frees the special first group as needed */
3955 prev->next = group->next;
3956 os_free(group);
3957 break;
3958 }
3959 prev = prev->next;
3960 }
3961
3962 }
3963
3964
3965 /* Increase the reference counter for group */
wpa_group_get(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3966 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
3967 struct wpa_group *group)
3968 {
3969 /* Skip the special first group */
3970 if (wpa_auth->group == group)
3971 return;
3972
3973 group->references++;
3974 }
3975
3976
3977 /* Decrease the reference counter and maybe free the group */
wpa_group_put(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3978 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
3979 struct wpa_group *group)
3980 {
3981 /* Skip the special first group */
3982 if (wpa_auth->group == group)
3983 return;
3984
3985 group->references--;
3986 if (group->references)
3987 return;
3988 wpa_group_free(wpa_auth, group);
3989 }
3990
3991
3992 /*
3993 * Add a group that has its references counter set to zero. Caller needs to
3994 * call wpa_group_get() on the return value to mark the entry in use.
3995 */
3996 static struct wpa_group *
wpa_auth_add_group(struct wpa_authenticator * wpa_auth,int vlan_id)3997 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3998 {
3999 struct wpa_group *group;
4000
4001 if (wpa_auth == NULL || wpa_auth->group == NULL)
4002 return NULL;
4003
4004 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
4005 vlan_id);
4006 group = wpa_group_init(wpa_auth, vlan_id, 0);
4007 if (group == NULL)
4008 return NULL;
4009
4010 group->next = wpa_auth->group->next;
4011 wpa_auth->group->next = group;
4012
4013 return group;
4014 }
4015
4016
4017 /*
4018 * Enforce that the group state machine for the VLAN is running, increase
4019 * reference counter as interface is up. References might have been increased
4020 * even if a negative value is returned.
4021 * Returns: -1 on error (group missing, group already failed); otherwise, 0
4022 */
wpa_auth_ensure_group(struct wpa_authenticator * wpa_auth,int vlan_id)4023 int wpa_auth_ensure_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4024 {
4025 struct wpa_group *group;
4026
4027 if (wpa_auth == NULL)
4028 return 0;
4029
4030 group = wpa_auth->group;
4031 while (group) {
4032 if (group->vlan_id == vlan_id)
4033 break;
4034 group = group->next;
4035 }
4036
4037 if (group == NULL) {
4038 group = wpa_auth_add_group(wpa_auth, vlan_id);
4039 if (group == NULL)
4040 return -1;
4041 }
4042
4043 wpa_printf(MSG_DEBUG,
4044 "WPA: Ensure group state machine running for VLAN ID %d",
4045 vlan_id);
4046
4047 wpa_group_get(wpa_auth, group);
4048 group->num_setup_iface++;
4049
4050 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4051 return -1;
4052
4053 return 0;
4054 }
4055
4056
4057 /*
4058 * Decrease reference counter, expected to be zero afterwards.
4059 * returns: -1 on error (group not found, group in fail state)
4060 * -2 if wpa_group is still referenced
4061 * 0 else
4062 */
wpa_auth_release_group(struct wpa_authenticator * wpa_auth,int vlan_id)4063 int wpa_auth_release_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4064 {
4065 struct wpa_group *group;
4066 int ret = 0;
4067
4068 if (wpa_auth == NULL)
4069 return 0;
4070
4071 group = wpa_auth->group;
4072 while (group) {
4073 if (group->vlan_id == vlan_id)
4074 break;
4075 group = group->next;
4076 }
4077
4078 if (group == NULL)
4079 return -1;
4080
4081 wpa_printf(MSG_DEBUG,
4082 "WPA: Try stopping group state machine for VLAN ID %d",
4083 vlan_id);
4084
4085 if (group->num_setup_iface <= 0) {
4086 wpa_printf(MSG_ERROR,
4087 "WPA: wpa_auth_release_group called more often than wpa_auth_ensure_group for VLAN ID %d, skipping.",
4088 vlan_id);
4089 return -1;
4090 }
4091 group->num_setup_iface--;
4092
4093 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4094 ret = -1;
4095
4096 if (group->references > 1) {
4097 wpa_printf(MSG_DEBUG,
4098 "WPA: Cannot stop group state machine for VLAN ID %d as references are still hold",
4099 vlan_id);
4100 ret = -2;
4101 }
4102
4103 wpa_group_put(wpa_auth, group);
4104
4105 return ret;
4106 }
4107
4108
wpa_auth_sta_set_vlan(struct wpa_state_machine * sm,int vlan_id)4109 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
4110 {
4111 struct wpa_group *group;
4112
4113 if (sm == NULL || sm->wpa_auth == NULL)
4114 return 0;
4115
4116 group = sm->wpa_auth->group;
4117 while (group) {
4118 if (group->vlan_id == vlan_id)
4119 break;
4120 group = group->next;
4121 }
4122
4123 if (group == NULL) {
4124 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
4125 if (group == NULL)
4126 return -1;
4127 }
4128
4129 if (sm->group == group)
4130 return 0;
4131
4132 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4133 return -1;
4134
4135 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
4136 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
4137
4138 wpa_group_get(sm->wpa_auth, group);
4139 wpa_group_put(sm->wpa_auth, sm->group);
4140 sm->group = group;
4141
4142 return 0;
4143 }
4144
4145
wpa_auth_eapol_key_tx_status(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int ack)4146 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
4147 struct wpa_state_machine *sm, int ack)
4148 {
4149 if (wpa_auth == NULL || sm == NULL)
4150 return;
4151 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
4152 " ack=%d", MAC2STR(sm->addr), ack);
4153 if (sm->pending_1_of_4_timeout && ack) {
4154 /*
4155 * Some deployed supplicant implementations update their SNonce
4156 * for each EAPOL-Key 2/4 message even within the same 4-way
4157 * handshake and then fail to use the first SNonce when
4158 * deriving the PTK. This results in unsuccessful 4-way
4159 * handshake whenever the relatively short initial timeout is
4160 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
4161 * around this by increasing the timeout now that we know that
4162 * the station has received the frame.
4163 */
4164 int timeout_ms = eapol_key_timeout_subseq;
4165 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
4166 "timeout by %u ms because of acknowledged frame",
4167 timeout_ms);
4168 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
4169 eloop_register_timeout(timeout_ms / 1000,
4170 (timeout_ms % 1000) * 1000,
4171 wpa_send_eapol_timeout, wpa_auth, sm);
4172 }
4173 }
4174
4175
wpa_auth_uses_sae(struct wpa_state_machine * sm)4176 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
4177 {
4178 if (sm == NULL)
4179 return 0;
4180 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
4181 }
4182
4183
wpa_auth_uses_ft_sae(struct wpa_state_machine * sm)4184 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
4185 {
4186 if (sm == NULL)
4187 return 0;
4188 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
4189 }
4190
4191
4192 #ifdef CONFIG_P2P
wpa_auth_get_ip_addr(struct wpa_state_machine * sm,u8 * addr)4193 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
4194 {
4195 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
4196 return -1;
4197 os_memcpy(addr, sm->ip_addr, 4);
4198 return 0;
4199 }
4200 #endif /* CONFIG_P2P */
4201
4202
wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator * wpa_auth,struct radius_das_attrs * attr)4203 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth,
4204 struct radius_das_attrs *attr)
4205 {
4206 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr);
4207 }
4208
4209
wpa_auth_reconfig_group_keys(struct wpa_authenticator * wpa_auth)4210 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth)
4211 {
4212 struct wpa_group *group;
4213
4214 if (!wpa_auth)
4215 return;
4216 for (group = wpa_auth->group; group; group = group->next)
4217 wpa_group_config_group_keys(wpa_auth, group);
4218 }
4219