1 /*
2 * IEEE 802.11 RSN / WPA Authenticator
3 * Copyright (c) 2004-2013, 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_wrap.h"
17 #include "crypto/crypto.h"
18 #include "crypto/sha1.h"
19 #include "crypto/sha256.h"
20 #include "crypto/random.h"
21 #include "eapol_auth/eapol_auth_sm.h"
22 #include "ap_config.h"
23 #include "ieee802_11.h"
24 #include "wpa_auth.h"
25 #include "pmksa_cache_auth.h"
26 #include "wpa_auth_i.h"
27 #include "wpa_auth_ie.h"
28
29 #define STATE_MACHINE_DATA struct wpa_state_machine
30 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
31 #define STATE_MACHINE_ADDR sm->addr
32
33
34 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
35 static int wpa_sm_step(struct wpa_state_machine *sm);
36 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len);
37 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
38 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
39 struct wpa_group *group);
40 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
41 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
42 struct wpa_group *group);
43 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
44 struct wpa_group *group);
45
46 static const u32 dot11RSNAConfigGroupUpdateCount = 4;
47 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
48 static const u32 eapol_key_timeout_first = 100; /* ms */
49 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
50 static const u32 eapol_key_timeout_first_group = 500; /* ms */
51
52 /* TODO: make these configurable */
53 static const int dot11RSNAConfigPMKLifetime = 43200;
54 static const int dot11RSNAConfigPMKReauthThreshold = 70;
55 static const int dot11RSNAConfigSATimeout = 60;
56
57
wpa_auth_mic_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)58 static inline int wpa_auth_mic_failure_report(
59 struct wpa_authenticator *wpa_auth, const u8 *addr)
60 {
61 if (wpa_auth->cb.mic_failure_report)
62 return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
63 return 0;
64 }
65
66
wpa_auth_set_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var,int value)67 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
68 const u8 *addr, wpa_eapol_variable var,
69 int value)
70 {
71 if (wpa_auth->cb.set_eapol)
72 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
73 }
74
75
wpa_auth_get_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var)76 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
77 const u8 *addr, wpa_eapol_variable var)
78 {
79 if (wpa_auth->cb.get_eapol == NULL)
80 return -1;
81 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
82 }
83
84
wpa_auth_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk)85 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
86 const u8 *addr,
87 const u8 *p2p_dev_addr,
88 const u8 *prev_psk)
89 {
90 if (wpa_auth->cb.get_psk == NULL)
91 return NULL;
92 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, p2p_dev_addr,
93 prev_psk);
94 }
95
96
wpa_auth_get_msk(struct wpa_authenticator * wpa_auth,const u8 * addr,u8 * msk,size_t * len)97 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
98 const u8 *addr, u8 *msk, size_t *len)
99 {
100 if (wpa_auth->cb.get_msk == NULL)
101 return -1;
102 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
103 }
104
105
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)106 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
107 int vlan_id,
108 enum wpa_alg alg, const u8 *addr, int idx,
109 u8 *key, size_t key_len)
110 {
111 if (wpa_auth->cb.set_key == NULL)
112 return -1;
113 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
114 key, key_len);
115 }
116
117
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)118 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
119 const u8 *addr, int idx, u8 *seq)
120 {
121 if (wpa_auth->cb.get_seqnum == NULL)
122 return -1;
123 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
124 }
125
126
127 static inline int
wpa_auth_send_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * data,size_t data_len,int encrypt)128 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
129 const u8 *data, size_t data_len, int encrypt)
130 {
131 if (wpa_auth->cb.send_eapol == NULL)
132 return -1;
133 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
134 encrypt);
135 }
136
137
wpa_auth_for_each_sta(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)138 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
139 int (*cb)(struct wpa_state_machine *sm, void *ctx),
140 void *cb_ctx)
141 {
142 if (wpa_auth->cb.for_each_sta == NULL)
143 return 0;
144 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
145 }
146
147
wpa_auth_for_each_auth(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_authenticator * a,void * ctx),void * cb_ctx)148 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
149 int (*cb)(struct wpa_authenticator *a, void *ctx),
150 void *cb_ctx)
151 {
152 if (wpa_auth->cb.for_each_auth == NULL)
153 return 0;
154 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
155 }
156
157
wpa_auth_logger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * txt)158 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
159 logger_level level, const char *txt)
160 {
161 if (wpa_auth->cb.logger == NULL)
162 return;
163 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
164 }
165
166
wpa_auth_vlogger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * fmt,...)167 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
168 logger_level level, const char *fmt, ...)
169 {
170 char *format;
171 int maxlen;
172 va_list ap;
173
174 if (wpa_auth->cb.logger == NULL)
175 return;
176
177 maxlen = os_strlen(fmt) + 100;
178 format = os_malloc(maxlen);
179 if (!format)
180 return;
181
182 va_start(ap, fmt);
183 vsnprintf(format, maxlen, fmt, ap);
184 va_end(ap);
185
186 wpa_auth_logger(wpa_auth, addr, level, format);
187
188 os_free(format);
189 }
190
191
wpa_sta_disconnect(struct wpa_authenticator * wpa_auth,const u8 * addr)192 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
193 const u8 *addr)
194 {
195 if (wpa_auth->cb.disconnect == NULL)
196 return;
197 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
198 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
199 WLAN_REASON_PREV_AUTH_NOT_VALID);
200 }
201
202
wpa_use_aes_cmac(struct wpa_state_machine * sm)203 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
204 {
205 int ret = 0;
206 #ifdef CONFIG_IEEE80211R
207 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
208 ret = 1;
209 #endif /* CONFIG_IEEE80211R */
210 #ifdef CONFIG_IEEE80211W
211 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
212 ret = 1;
213 #endif /* CONFIG_IEEE80211W */
214 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
215 ret = 1;
216 return ret;
217 }
218
219
wpa_rekey_gmk(void * eloop_ctx,void * timeout_ctx)220 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
221 {
222 struct wpa_authenticator *wpa_auth = eloop_ctx;
223
224 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
225 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
226 "initialization.");
227 } else {
228 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
229 wpa_hexdump_key(MSG_DEBUG, "GMK",
230 wpa_auth->group->GMK, WPA_GMK_LEN);
231 }
232
233 if (wpa_auth->conf.wpa_gmk_rekey) {
234 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
235 wpa_rekey_gmk, wpa_auth, NULL);
236 }
237 }
238
239
wpa_rekey_gtk(void * eloop_ctx,void * timeout_ctx)240 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
241 {
242 struct wpa_authenticator *wpa_auth = eloop_ctx;
243 struct wpa_group *group;
244
245 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
246 for (group = wpa_auth->group; group; group = group->next) {
247 group->GTKReKey = TRUE;
248 do {
249 group->changed = FALSE;
250 wpa_group_sm_step(wpa_auth, group);
251 } while (group->changed);
252 }
253
254 if (wpa_auth->conf.wpa_group_rekey) {
255 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
256 0, wpa_rekey_gtk, wpa_auth, NULL);
257 }
258 }
259
260
wpa_rekey_ptk(void * eloop_ctx,void * timeout_ctx)261 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
262 {
263 struct wpa_authenticator *wpa_auth = eloop_ctx;
264 struct wpa_state_machine *sm = timeout_ctx;
265
266 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
267 wpa_request_new_ptk(sm);
268 wpa_sm_step(sm);
269 }
270
271
wpa_auth_pmksa_clear_cb(struct wpa_state_machine * sm,void * ctx)272 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
273 {
274 if (sm->pmksa == ctx)
275 sm->pmksa = NULL;
276 return 0;
277 }
278
279
wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx)280 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
281 void *ctx)
282 {
283 struct wpa_authenticator *wpa_auth = ctx;
284 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
285 }
286
287
wpa_group_init_gmk_and_counter(struct wpa_authenticator * wpa_auth,struct wpa_group * group)288 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
289 struct wpa_group *group)
290 {
291 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
292 u8 rkey[32];
293 unsigned long ptr;
294
295 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
296 return -1;
297 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
298
299 /*
300 * Counter = PRF-256(Random number, "Init Counter",
301 * Local MAC Address || Time)
302 */
303 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
304 wpa_get_ntp_timestamp(buf + ETH_ALEN);
305 ptr = (unsigned long) group;
306 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
307 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
308 return -1;
309
310 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
311 group->Counter, WPA_NONCE_LEN) < 0)
312 return -1;
313 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
314 group->Counter, WPA_NONCE_LEN);
315
316 return 0;
317 }
318
319
wpa_group_init(struct wpa_authenticator * wpa_auth,int vlan_id,int delay_init)320 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
321 int vlan_id, int delay_init)
322 {
323 struct wpa_group *group;
324
325 group = os_zalloc(sizeof(struct wpa_group));
326 if (group == NULL)
327 return NULL;
328
329 group->GTKAuthenticator = TRUE;
330 group->vlan_id = vlan_id;
331 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
332
333 if (random_pool_ready() != 1) {
334 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
335 "for secure operations - update keys later when "
336 "the first station connects");
337 }
338
339 /*
340 * Set initial GMK/Counter value here. The actual values that will be
341 * used in negotiations will be set once the first station tries to
342 * connect. This allows more time for collecting additional randomness
343 * on embedded devices.
344 */
345 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
346 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
347 "initialization.");
348 os_free(group);
349 return NULL;
350 }
351
352 group->GInit = TRUE;
353 if (delay_init) {
354 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
355 "until Beacon frames have been configured");
356 /* Initialization is completed in wpa_init_keys(). */
357 } else {
358 wpa_group_sm_step(wpa_auth, group);
359 group->GInit = FALSE;
360 wpa_group_sm_step(wpa_auth, group);
361 }
362
363 return group;
364 }
365
366
367 /**
368 * wpa_init - Initialize WPA authenticator
369 * @addr: Authenticator address
370 * @conf: Configuration for WPA authenticator
371 * @cb: Callback functions for WPA authenticator
372 * Returns: Pointer to WPA authenticator data or %NULL on failure
373 */
wpa_init(const u8 * addr,struct wpa_auth_config * conf,struct wpa_auth_callbacks * cb)374 struct wpa_authenticator * wpa_init(const u8 *addr,
375 struct wpa_auth_config *conf,
376 struct wpa_auth_callbacks *cb)
377 {
378 struct wpa_authenticator *wpa_auth;
379
380 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
381 if (wpa_auth == NULL)
382 return NULL;
383 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
384 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
385 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
386
387 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
388 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
389 os_free(wpa_auth);
390 return NULL;
391 }
392
393 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
394 if (wpa_auth->group == NULL) {
395 os_free(wpa_auth->wpa_ie);
396 os_free(wpa_auth);
397 return NULL;
398 }
399
400 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
401 wpa_auth);
402 if (wpa_auth->pmksa == NULL) {
403 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
404 os_free(wpa_auth->wpa_ie);
405 os_free(wpa_auth);
406 return NULL;
407 }
408
409 #ifdef CONFIG_IEEE80211R
410 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
411 if (wpa_auth->ft_pmk_cache == NULL) {
412 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
413 os_free(wpa_auth->wpa_ie);
414 pmksa_cache_auth_deinit(wpa_auth->pmksa);
415 os_free(wpa_auth);
416 return NULL;
417 }
418 #endif /* CONFIG_IEEE80211R */
419
420 if (wpa_auth->conf.wpa_gmk_rekey) {
421 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
422 wpa_rekey_gmk, wpa_auth, NULL);
423 }
424
425 if (wpa_auth->conf.wpa_group_rekey) {
426 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
427 wpa_rekey_gtk, wpa_auth, NULL);
428 }
429
430 #ifdef CONFIG_P2P
431 if (WPA_GET_BE32(conf->ip_addr_start)) {
432 int count = WPA_GET_BE32(conf->ip_addr_end) -
433 WPA_GET_BE32(conf->ip_addr_start) + 1;
434 if (count > 1000)
435 count = 1000;
436 if (count > 0)
437 wpa_auth->ip_pool = bitfield_alloc(count);
438 }
439 #endif /* CONFIG_P2P */
440
441 return wpa_auth;
442 }
443
444
wpa_init_keys(struct wpa_authenticator * wpa_auth)445 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
446 {
447 struct wpa_group *group = wpa_auth->group;
448
449 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
450 "keys");
451 wpa_group_sm_step(wpa_auth, group);
452 group->GInit = FALSE;
453 wpa_group_sm_step(wpa_auth, group);
454 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
455 return -1;
456 return 0;
457 }
458
459
460 /**
461 * wpa_deinit - Deinitialize WPA authenticator
462 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
463 */
wpa_deinit(struct wpa_authenticator * wpa_auth)464 void wpa_deinit(struct wpa_authenticator *wpa_auth)
465 {
466 struct wpa_group *group, *prev;
467
468 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
469 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
470
471 #ifdef CONFIG_PEERKEY
472 while (wpa_auth->stsl_negotiations)
473 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
474 #endif /* CONFIG_PEERKEY */
475
476 pmksa_cache_auth_deinit(wpa_auth->pmksa);
477
478 #ifdef CONFIG_IEEE80211R
479 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
480 wpa_auth->ft_pmk_cache = NULL;
481 #endif /* CONFIG_IEEE80211R */
482
483 #ifdef CONFIG_P2P
484 bitfield_free(wpa_auth->ip_pool);
485 #endif /* CONFIG_P2P */
486
487
488 os_free(wpa_auth->wpa_ie);
489
490 group = wpa_auth->group;
491 while (group) {
492 prev = group;
493 group = group->next;
494 os_free(prev);
495 }
496
497 os_free(wpa_auth);
498 }
499
500
501 /**
502 * wpa_reconfig - Update WPA authenticator configuration
503 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
504 * @conf: Configuration for WPA authenticator
505 */
wpa_reconfig(struct wpa_authenticator * wpa_auth,struct wpa_auth_config * conf)506 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
507 struct wpa_auth_config *conf)
508 {
509 struct wpa_group *group;
510 if (wpa_auth == NULL)
511 return 0;
512
513 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
514 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
515 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
516 return -1;
517 }
518
519 /*
520 * Reinitialize GTK to make sure it is suitable for the new
521 * configuration.
522 */
523 group = wpa_auth->group;
524 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
525 group->GInit = TRUE;
526 wpa_group_sm_step(wpa_auth, group);
527 group->GInit = FALSE;
528 wpa_group_sm_step(wpa_auth, group);
529
530 return 0;
531 }
532
533
534 struct wpa_state_machine *
wpa_auth_sta_init(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr)535 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
536 const u8 *p2p_dev_addr)
537 {
538 struct wpa_state_machine *sm;
539
540 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
541 return NULL;
542
543 sm = os_zalloc(sizeof(struct wpa_state_machine));
544 if (sm == NULL)
545 return NULL;
546 os_memcpy(sm->addr, addr, ETH_ALEN);
547 if (p2p_dev_addr)
548 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
549
550 sm->wpa_auth = wpa_auth;
551 sm->group = wpa_auth->group;
552
553 return sm;
554 }
555
556
wpa_auth_sta_associated(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm)557 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
558 struct wpa_state_machine *sm)
559 {
560 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
561 return -1;
562
563 #ifdef CONFIG_IEEE80211R
564 if (sm->ft_completed) {
565 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
566 "FT authentication already completed - do not "
567 "start 4-way handshake");
568 /* Go to PTKINITDONE state to allow GTK rekeying */
569 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
570 return 0;
571 }
572 #endif /* CONFIG_IEEE80211R */
573
574 if (sm->started) {
575 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
576 sm->ReAuthenticationRequest = TRUE;
577 return wpa_sm_step(sm);
578 }
579
580 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
581 "start authentication");
582 sm->started = 1;
583
584 sm->Init = TRUE;
585 if (wpa_sm_step(sm) == 1)
586 return 1; /* should not really happen */
587 sm->Init = FALSE;
588 sm->AuthenticationRequest = TRUE;
589 return wpa_sm_step(sm);
590 }
591
592
wpa_auth_sta_no_wpa(struct wpa_state_machine * sm)593 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
594 {
595 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
596 * reassociates back to the same AP while the previous entry for the
597 * STA has not yet been removed. */
598 if (sm == NULL)
599 return;
600
601 sm->wpa_key_mgmt = 0;
602 }
603
604
wpa_free_sta_sm(struct wpa_state_machine * sm)605 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
606 {
607 #ifdef CONFIG_P2P
608 if (WPA_GET_BE32(sm->ip_addr)) {
609 u32 start;
610 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
611 "address %u.%u.%u.%u from " MACSTR,
612 sm->ip_addr[0], sm->ip_addr[1],
613 sm->ip_addr[2], sm->ip_addr[3],
614 MAC2STR(sm->addr));
615 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
616 bitfield_clear(sm->wpa_auth->ip_pool,
617 WPA_GET_BE32(sm->ip_addr) - start);
618 }
619 #endif /* CONFIG_P2P */
620 if (sm->GUpdateStationKeys) {
621 sm->group->GKeyDoneStations--;
622 sm->GUpdateStationKeys = FALSE;
623 }
624 #ifdef CONFIG_IEEE80211R
625 os_free(sm->assoc_resp_ftie);
626 wpabuf_free(sm->ft_pending_req_ies);
627 #endif /* CONFIG_IEEE80211R */
628 os_free(sm->last_rx_eapol_key);
629 os_free(sm->wpa_ie);
630 os_free(sm);
631 }
632
633
wpa_auth_sta_deinit(struct wpa_state_machine * sm)634 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
635 {
636 if (sm == NULL)
637 return;
638
639 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
640 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
641 "strict rekeying - force GTK rekey since STA "
642 "is leaving");
643 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
644 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
645 NULL);
646 }
647
648 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
649 sm->pending_1_of_4_timeout = 0;
650 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
651 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
652 if (sm->in_step_loop) {
653 /* Must not free state machine while wpa_sm_step() is running.
654 * Freeing will be completed in the end of wpa_sm_step(). */
655 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
656 "machine deinit for " MACSTR, MAC2STR(sm->addr));
657 sm->pending_deinit = 1;
658 } else
659 wpa_free_sta_sm(sm);
660 }
661
662
wpa_request_new_ptk(struct wpa_state_machine * sm)663 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
664 {
665 if (sm == NULL)
666 return;
667
668 sm->PTKRequest = TRUE;
669 sm->PTK_valid = 0;
670 }
671
672
wpa_replay_counter_valid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)673 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
674 const u8 *replay_counter)
675 {
676 int i;
677 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
678 if (!ctr[i].valid)
679 break;
680 if (os_memcmp(replay_counter, ctr[i].counter,
681 WPA_REPLAY_COUNTER_LEN) == 0)
682 return 1;
683 }
684 return 0;
685 }
686
687
wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)688 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
689 const u8 *replay_counter)
690 {
691 int i;
692 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
693 if (ctr[i].valid &&
694 (replay_counter == NULL ||
695 os_memcmp(replay_counter, ctr[i].counter,
696 WPA_REPLAY_COUNTER_LEN) == 0))
697 ctr[i].valid = FALSE;
698 }
699 }
700
701
702 #ifdef CONFIG_IEEE80211R
ft_check_msg_2_of_4(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,struct wpa_eapol_ie_parse * kde)703 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
704 struct wpa_state_machine *sm,
705 struct wpa_eapol_ie_parse *kde)
706 {
707 struct wpa_ie_data ie;
708 struct rsn_mdie *mdie;
709
710 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
711 ie.num_pmkid != 1 || ie.pmkid == NULL) {
712 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
713 "FT 4-way handshake message 2/4");
714 return -1;
715 }
716
717 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
718 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
719 sm->sup_pmk_r1_name, PMKID_LEN);
720
721 if (!kde->mdie || !kde->ftie) {
722 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
723 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
724 return -1;
725 }
726
727 mdie = (struct rsn_mdie *) (kde->mdie + 2);
728 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
729 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
730 MOBILITY_DOMAIN_ID_LEN) != 0) {
731 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
732 return -1;
733 }
734
735 if (sm->assoc_resp_ftie &&
736 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
737 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
738 2 + sm->assoc_resp_ftie[1]) != 0)) {
739 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
740 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
741 kde->ftie, kde->ftie_len);
742 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
743 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
744 return -1;
745 }
746
747 return 0;
748 }
749 #endif /* CONFIG_IEEE80211R */
750
751
wpa_receive_error_report(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int group)752 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
753 struct wpa_state_machine *sm, int group)
754 {
755 /* Supplicant reported a Michael MIC error */
756 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
757 "received EAPOL-Key Error Request "
758 "(STA detected Michael MIC failure (group=%d))",
759 group);
760
761 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
762 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
763 "ignore Michael MIC failure report since "
764 "group cipher is not TKIP");
765 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
766 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
767 "ignore Michael MIC failure report since "
768 "pairwise cipher is not TKIP");
769 } else {
770 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
771 return 1; /* STA entry was removed */
772 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
773 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
774 }
775
776 /*
777 * Error report is not a request for a new key handshake, but since
778 * Authenticator may do it, let's change the keys now anyway.
779 */
780 wpa_request_new_ptk(sm);
781 return 0;
782 }
783
784
wpa_receive(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,u8 * data,size_t data_len)785 void wpa_receive(struct wpa_authenticator *wpa_auth,
786 struct wpa_state_machine *sm,
787 u8 *data, size_t data_len)
788 {
789 struct ieee802_1x_hdr *hdr;
790 struct wpa_eapol_key *key;
791 u16 key_info, key_data_length;
792 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
793 SMK_M1, SMK_M3, SMK_ERROR } msg;
794 char *msgtxt;
795 struct wpa_eapol_ie_parse kde;
796 int ft;
797 const u8 *eapol_key_ie;
798 size_t eapol_key_ie_len;
799
800 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
801 return;
802
803 if (data_len < sizeof(*hdr) + sizeof(*key))
804 return;
805
806 hdr = (struct ieee802_1x_hdr *) data;
807 key = (struct wpa_eapol_key *) (hdr + 1);
808 key_info = WPA_GET_BE16(key->key_info);
809 key_data_length = WPA_GET_BE16(key->key_data_length);
810 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
811 " key_info=0x%x type=%u key_data_length=%u",
812 MAC2STR(sm->addr), key_info, key->type, key_data_length);
813 if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) {
814 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
815 "key_data overflow (%d > %lu)",
816 key_data_length,
817 (unsigned long) (data_len - sizeof(*hdr) -
818 sizeof(*key)));
819 return;
820 }
821
822 if (sm->wpa == WPA_VERSION_WPA2) {
823 if (key->type == EAPOL_KEY_TYPE_WPA) {
824 /*
825 * Some deployed station implementations seem to send
826 * msg 4/4 with incorrect type value in WPA2 mode.
827 */
828 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
829 "with unexpected WPA type in RSN mode");
830 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
831 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
832 "unexpected type %d in RSN mode",
833 key->type);
834 return;
835 }
836 } else {
837 if (key->type != EAPOL_KEY_TYPE_WPA) {
838 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
839 "unexpected type %d in WPA mode",
840 key->type);
841 return;
842 }
843 }
844
845 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
846 WPA_NONCE_LEN);
847 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
848 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
849
850 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
851 * are set */
852
853 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
854 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
855 if (key_info & WPA_KEY_INFO_ERROR) {
856 msg = SMK_ERROR;
857 msgtxt = "SMK Error";
858 } else {
859 msg = SMK_M1;
860 msgtxt = "SMK M1";
861 }
862 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
863 msg = SMK_M3;
864 msgtxt = "SMK M3";
865 } else if (key_info & WPA_KEY_INFO_REQUEST) {
866 msg = REQUEST;
867 msgtxt = "Request";
868 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
869 msg = GROUP_2;
870 msgtxt = "2/2 Group";
871 } else if (key_data_length == 0) {
872 msg = PAIRWISE_4;
873 msgtxt = "4/4 Pairwise";
874 } else {
875 msg = PAIRWISE_2;
876 msgtxt = "2/4 Pairwise";
877 }
878
879 /* TODO: key_info type validation for PeerKey */
880 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
881 msg == GROUP_2) {
882 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
883 if (sm->pairwise == WPA_CIPHER_CCMP ||
884 sm->pairwise == WPA_CIPHER_GCMP) {
885 if (wpa_use_aes_cmac(sm) &&
886 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN &&
887 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
888 wpa_auth_logger(wpa_auth, sm->addr,
889 LOGGER_WARNING,
890 "advertised support for "
891 "AES-128-CMAC, but did not "
892 "use it");
893 return;
894 }
895
896 if (!wpa_use_aes_cmac(sm) &&
897 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
898 wpa_auth_logger(wpa_auth, sm->addr,
899 LOGGER_WARNING,
900 "did not use HMAC-SHA1-AES "
901 "with CCMP/GCMP");
902 return;
903 }
904 }
905 }
906
907 if (key_info & WPA_KEY_INFO_REQUEST) {
908 if (sm->req_replay_counter_used &&
909 os_memcmp(key->replay_counter, sm->req_replay_counter,
910 WPA_REPLAY_COUNTER_LEN) <= 0) {
911 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
912 "received EAPOL-Key request with "
913 "replayed counter");
914 return;
915 }
916 }
917
918 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
919 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
920 int i;
921
922 if (msg == PAIRWISE_2 &&
923 wpa_replay_counter_valid(sm->prev_key_replay,
924 key->replay_counter) &&
925 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
926 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
927 {
928 /*
929 * Some supplicant implementations (e.g., Windows XP
930 * WZC) update SNonce for each EAPOL-Key 2/4. This
931 * breaks the workaround on accepting any of the
932 * pending requests, so allow the SNonce to be updated
933 * even if we have already sent out EAPOL-Key 3/4.
934 */
935 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
936 "Process SNonce update from STA "
937 "based on retransmitted EAPOL-Key "
938 "1/4");
939 sm->update_snonce = 1;
940 wpa_replay_counter_mark_invalid(sm->prev_key_replay,
941 key->replay_counter);
942 goto continue_processing;
943 }
944
945 if (msg == PAIRWISE_2 &&
946 wpa_replay_counter_valid(sm->prev_key_replay,
947 key->replay_counter) &&
948 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
949 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
950 "ignore retransmitted EAPOL-Key %s - "
951 "SNonce did not change", msgtxt);
952 } else {
953 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
954 "received EAPOL-Key %s with "
955 "unexpected replay counter", msgtxt);
956 }
957 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
958 if (!sm->key_replay[i].valid)
959 break;
960 wpa_hexdump(MSG_DEBUG, "pending replay counter",
961 sm->key_replay[i].counter,
962 WPA_REPLAY_COUNTER_LEN);
963 }
964 wpa_hexdump(MSG_DEBUG, "received replay counter",
965 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
966 return;
967 }
968
969 continue_processing:
970 switch (msg) {
971 case PAIRWISE_2:
972 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
973 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
974 (!sm->update_snonce ||
975 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
976 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
977 "received EAPOL-Key msg 2/4 in "
978 "invalid state (%d) - dropped",
979 sm->wpa_ptk_state);
980 return;
981 }
982 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
983 if (sm->group->reject_4way_hs_for_entropy) {
984 /*
985 * The system did not have enough entropy to generate
986 * strong random numbers. Reject the first 4-way
987 * handshake(s) and collect some entropy based on the
988 * information from it. Once enough entropy is
989 * available, the next atempt will trigger GMK/Key
990 * Counter update and the station will be allowed to
991 * continue.
992 */
993 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
994 "collect more entropy for random number "
995 "generation");
996 random_mark_pool_ready();
997 wpa_sta_disconnect(wpa_auth, sm->addr);
998 return;
999 }
1000 if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length,
1001 &kde) < 0) {
1002 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1003 "received EAPOL-Key msg 2/4 with "
1004 "invalid Key Data contents");
1005 return;
1006 }
1007 if (kde.rsn_ie) {
1008 eapol_key_ie = kde.rsn_ie;
1009 eapol_key_ie_len = kde.rsn_ie_len;
1010 } else if (kde.osen) {
1011 eapol_key_ie = kde.osen;
1012 eapol_key_ie_len = kde.osen_len;
1013 } else {
1014 eapol_key_ie = kde.wpa_ie;
1015 eapol_key_ie_len = kde.wpa_ie_len;
1016 }
1017 ft = sm->wpa == WPA_VERSION_WPA2 &&
1018 wpa_key_mgmt_ft(sm->wpa_key_mgmt);
1019 if (sm->wpa_ie == NULL ||
1020 wpa_compare_rsn_ie(ft,
1021 sm->wpa_ie, sm->wpa_ie_len,
1022 eapol_key_ie, eapol_key_ie_len)) {
1023 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1024 "WPA IE from (Re)AssocReq did not "
1025 "match with msg 2/4");
1026 if (sm->wpa_ie) {
1027 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
1028 sm->wpa_ie, sm->wpa_ie_len);
1029 }
1030 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
1031 eapol_key_ie, eapol_key_ie_len);
1032 /* MLME-DEAUTHENTICATE.request */
1033 wpa_sta_disconnect(wpa_auth, sm->addr);
1034 return;
1035 }
1036 #ifdef CONFIG_IEEE80211R
1037 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
1038 wpa_sta_disconnect(wpa_auth, sm->addr);
1039 return;
1040 }
1041 #endif /* CONFIG_IEEE80211R */
1042 #ifdef CONFIG_P2P
1043 if (kde.ip_addr_req && kde.ip_addr_req[0] &&
1044 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
1045 int idx;
1046 wpa_printf(MSG_DEBUG, "P2P: IP address requested in "
1047 "EAPOL-Key exchange");
1048 idx = bitfield_get_first_zero(wpa_auth->ip_pool);
1049 if (idx >= 0) {
1050 u32 start = WPA_GET_BE32(wpa_auth->conf.
1051 ip_addr_start);
1052 bitfield_set(wpa_auth->ip_pool, idx);
1053 WPA_PUT_BE32(sm->ip_addr, start + idx);
1054 wpa_printf(MSG_DEBUG, "P2P: Assigned IP "
1055 "address %u.%u.%u.%u to " MACSTR,
1056 sm->ip_addr[0], sm->ip_addr[1],
1057 sm->ip_addr[2], sm->ip_addr[3],
1058 MAC2STR(sm->addr));
1059 }
1060 }
1061 #endif /* CONFIG_P2P */
1062 break;
1063 case PAIRWISE_4:
1064 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1065 !sm->PTK_valid) {
1066 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1067 "received EAPOL-Key msg 4/4 in "
1068 "invalid state (%d) - dropped",
1069 sm->wpa_ptk_state);
1070 return;
1071 }
1072 break;
1073 case GROUP_2:
1074 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1075 || !sm->PTK_valid) {
1076 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1077 "received EAPOL-Key msg 2/2 in "
1078 "invalid state (%d) - dropped",
1079 sm->wpa_ptk_group_state);
1080 return;
1081 }
1082 break;
1083 #ifdef CONFIG_PEERKEY
1084 case SMK_M1:
1085 case SMK_M3:
1086 case SMK_ERROR:
1087 if (!wpa_auth->conf.peerkey) {
1088 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1089 "PeerKey use disabled - ignoring message");
1090 return;
1091 }
1092 if (!sm->PTK_valid) {
1093 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1094 "received EAPOL-Key msg SMK in "
1095 "invalid state - dropped");
1096 return;
1097 }
1098 break;
1099 #else /* CONFIG_PEERKEY */
1100 case SMK_M1:
1101 case SMK_M3:
1102 case SMK_ERROR:
1103 return; /* STSL disabled - ignore SMK messages */
1104 #endif /* CONFIG_PEERKEY */
1105 case REQUEST:
1106 break;
1107 }
1108
1109 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1110 "received EAPOL-Key frame (%s)", msgtxt);
1111
1112 if (key_info & WPA_KEY_INFO_ACK) {
1113 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1114 "received invalid EAPOL-Key: Key Ack set");
1115 return;
1116 }
1117
1118 if (!(key_info & WPA_KEY_INFO_MIC)) {
1119 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1120 "received invalid EAPOL-Key: Key MIC not set");
1121 return;
1122 }
1123
1124 sm->MICVerified = FALSE;
1125 if (sm->PTK_valid && !sm->update_snonce) {
1126 if (wpa_verify_key_mic(&sm->PTK, data, data_len)) {
1127 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1128 "received EAPOL-Key with invalid MIC");
1129 return;
1130 }
1131 sm->MICVerified = TRUE;
1132 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1133 sm->pending_1_of_4_timeout = 0;
1134 }
1135
1136 if (key_info & WPA_KEY_INFO_REQUEST) {
1137 if (sm->MICVerified) {
1138 sm->req_replay_counter_used = 1;
1139 os_memcpy(sm->req_replay_counter, key->replay_counter,
1140 WPA_REPLAY_COUNTER_LEN);
1141 } else {
1142 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1143 "received EAPOL-Key request with "
1144 "invalid MIC");
1145 return;
1146 }
1147
1148 /*
1149 * TODO: should decrypt key data field if encryption was used;
1150 * even though MAC address KDE is not normally encrypted,
1151 * supplicant is allowed to encrypt it.
1152 */
1153 if (msg == SMK_ERROR) {
1154 #ifdef CONFIG_PEERKEY
1155 wpa_smk_error(wpa_auth, sm, key);
1156 #endif /* CONFIG_PEERKEY */
1157 return;
1158 } else if (key_info & WPA_KEY_INFO_ERROR) {
1159 if (wpa_receive_error_report(
1160 wpa_auth, sm,
1161 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1162 return; /* STA entry was removed */
1163 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1164 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1165 "received EAPOL-Key Request for new "
1166 "4-Way Handshake");
1167 wpa_request_new_ptk(sm);
1168 #ifdef CONFIG_PEERKEY
1169 } else if (msg == SMK_M1) {
1170 wpa_smk_m1(wpa_auth, sm, key);
1171 #endif /* CONFIG_PEERKEY */
1172 } else if (key_data_length > 0 &&
1173 wpa_parse_kde_ies((const u8 *) (key + 1),
1174 key_data_length, &kde) == 0 &&
1175 kde.mac_addr) {
1176 } else {
1177 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1178 "received EAPOL-Key Request for GTK "
1179 "rekeying");
1180 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1181 wpa_rekey_gtk(wpa_auth, NULL);
1182 }
1183 } else {
1184 /* Do not allow the same key replay counter to be reused. */
1185 wpa_replay_counter_mark_invalid(sm->key_replay,
1186 key->replay_counter);
1187
1188 if (msg == PAIRWISE_2) {
1189 /*
1190 * Maintain a copy of the pending EAPOL-Key frames in
1191 * case the EAPOL-Key frame was retransmitted. This is
1192 * needed to allow EAPOL-Key msg 2/4 reply to another
1193 * pending msg 1/4 to update the SNonce to work around
1194 * unexpected supplicant behavior.
1195 */
1196 os_memcpy(sm->prev_key_replay, sm->key_replay,
1197 sizeof(sm->key_replay));
1198 } else {
1199 os_memset(sm->prev_key_replay, 0,
1200 sizeof(sm->prev_key_replay));
1201 }
1202
1203 /*
1204 * Make sure old valid counters are not accepted anymore and
1205 * do not get copied again.
1206 */
1207 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1208 }
1209
1210 #ifdef CONFIG_PEERKEY
1211 if (msg == SMK_M3) {
1212 wpa_smk_m3(wpa_auth, sm, key);
1213 return;
1214 }
1215 #endif /* CONFIG_PEERKEY */
1216
1217 os_free(sm->last_rx_eapol_key);
1218 sm->last_rx_eapol_key = os_malloc(data_len);
1219 if (sm->last_rx_eapol_key == NULL)
1220 return;
1221 os_memcpy(sm->last_rx_eapol_key, data, data_len);
1222 sm->last_rx_eapol_key_len = data_len;
1223
1224 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1225 sm->EAPOLKeyReceived = TRUE;
1226 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1227 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1228 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1229 wpa_sm_step(sm);
1230 }
1231
1232
wpa_gmk_to_gtk(const u8 * gmk,const char * label,const u8 * addr,const u8 * gnonce,u8 * gtk,size_t gtk_len)1233 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1234 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1235 {
1236 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1237 u8 *pos;
1238 int ret = 0;
1239
1240 /* GTK = PRF-X(GMK, "Group key expansion",
1241 * AA || GNonce || Time || random data)
1242 * The example described in the IEEE 802.11 standard uses only AA and
1243 * GNonce as inputs here. Add some more entropy since this derivation
1244 * is done only at the Authenticator and as such, does not need to be
1245 * exactly same.
1246 */
1247 os_memcpy(data, addr, ETH_ALEN);
1248 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1249 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1250 wpa_get_ntp_timestamp(pos);
1251 pos += 8;
1252 if (random_get_bytes(pos, 16) < 0)
1253 ret = -1;
1254
1255 #ifdef CONFIG_IEEE80211W
1256 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1257 #else /* CONFIG_IEEE80211W */
1258 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1259 < 0)
1260 ret = -1;
1261 #endif /* CONFIG_IEEE80211W */
1262
1263 return ret;
1264 }
1265
1266
wpa_send_eapol_timeout(void * eloop_ctx,void * timeout_ctx)1267 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1268 {
1269 struct wpa_authenticator *wpa_auth = eloop_ctx;
1270 struct wpa_state_machine *sm = timeout_ctx;
1271
1272 sm->pending_1_of_4_timeout = 0;
1273 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1274 sm->TimeoutEvt = TRUE;
1275 wpa_sm_step(sm);
1276 }
1277
1278
__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)1279 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1280 struct wpa_state_machine *sm, int key_info,
1281 const u8 *key_rsc, const u8 *nonce,
1282 const u8 *kde, size_t kde_len,
1283 int keyidx, int encr, int force_version)
1284 {
1285 struct ieee802_1x_hdr *hdr;
1286 struct wpa_eapol_key *key;
1287 size_t len;
1288 int alg;
1289 int key_data_len, pad_len = 0;
1290 u8 *buf, *pos;
1291 int version, pairwise;
1292 int i;
1293
1294 len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key);
1295
1296 if (force_version)
1297 version = force_version;
1298 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
1299 version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1300 else if (wpa_use_aes_cmac(sm))
1301 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1302 else if (sm->pairwise != WPA_CIPHER_TKIP)
1303 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1304 else
1305 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1306
1307 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1308
1309 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1310 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1311 "encr=%d)",
1312 version,
1313 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1314 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1315 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1316 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1317 pairwise, (unsigned long) kde_len, keyidx, encr);
1318
1319 key_data_len = kde_len;
1320
1321 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1322 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1323 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1324 pad_len = key_data_len % 8;
1325 if (pad_len)
1326 pad_len = 8 - pad_len;
1327 key_data_len += pad_len + 8;
1328 }
1329
1330 len += key_data_len;
1331
1332 hdr = os_zalloc(len);
1333 if (hdr == NULL)
1334 return;
1335 hdr->version = wpa_auth->conf.eapol_version;
1336 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1337 hdr->length = host_to_be16(len - sizeof(*hdr));
1338 key = (struct wpa_eapol_key *) (hdr + 1);
1339
1340 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1341 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1342 key_info |= version;
1343 if (encr && sm->wpa == WPA_VERSION_WPA2)
1344 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1345 if (sm->wpa != WPA_VERSION_WPA2)
1346 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1347 WPA_PUT_BE16(key->key_info, key_info);
1348
1349 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1350 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1351 if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1352 WPA_PUT_BE16(key->key_length, 0);
1353
1354 /* FIX: STSL: what to use as key_replay_counter? */
1355 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1356 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1357 os_memcpy(sm->key_replay[i].counter,
1358 sm->key_replay[i - 1].counter,
1359 WPA_REPLAY_COUNTER_LEN);
1360 }
1361 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1362 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1363 WPA_REPLAY_COUNTER_LEN);
1364 sm->key_replay[0].valid = TRUE;
1365
1366 if (nonce)
1367 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1368
1369 if (key_rsc)
1370 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1371
1372 if (kde && !encr) {
1373 os_memcpy(key + 1, kde, kde_len);
1374 WPA_PUT_BE16(key->key_data_length, kde_len);
1375 } else if (encr && kde) {
1376 buf = os_zalloc(key_data_len);
1377 if (buf == NULL) {
1378 os_free(hdr);
1379 return;
1380 }
1381 pos = buf;
1382 os_memcpy(pos, kde, kde_len);
1383 pos += kde_len;
1384
1385 if (pad_len)
1386 *pos++ = 0xdd;
1387
1388 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1389 buf, key_data_len);
1390 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1391 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1392 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1393 if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf,
1394 (u8 *) (key + 1))) {
1395 os_free(hdr);
1396 os_free(buf);
1397 return;
1398 }
1399 WPA_PUT_BE16(key->key_data_length, key_data_len);
1400 } else {
1401 u8 ek[32];
1402 os_memcpy(key->key_iv,
1403 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1404 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1405 os_memcpy(ek, key->key_iv, 16);
1406 os_memcpy(ek + 16, sm->PTK.kek, 16);
1407 os_memcpy(key + 1, buf, key_data_len);
1408 rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1409 WPA_PUT_BE16(key->key_data_length, key_data_len);
1410 }
1411 os_free(buf);
1412 }
1413
1414 if (key_info & WPA_KEY_INFO_MIC) {
1415 if (!sm->PTK_valid) {
1416 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1417 "PTK not valid when sending EAPOL-Key "
1418 "frame");
1419 os_free(hdr);
1420 return;
1421 }
1422 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1423 key->key_mic);
1424 #ifdef CONFIG_TESTING_OPTIONS
1425 if (!pairwise &&
1426 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1427 drand48() <
1428 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1429 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1430 "Corrupting group EAPOL-Key Key MIC");
1431 key->key_mic[0]++;
1432 }
1433 #endif /* CONFIG_TESTING_OPTIONS */
1434 }
1435
1436 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1437 1);
1438 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1439 sm->pairwise_set);
1440 os_free(hdr);
1441 }
1442
1443
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)1444 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1445 struct wpa_state_machine *sm, int key_info,
1446 const u8 *key_rsc, const u8 *nonce,
1447 const u8 *kde, size_t kde_len,
1448 int keyidx, int encr)
1449 {
1450 int timeout_ms;
1451 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1452 int ctr;
1453
1454 if (sm == NULL)
1455 return;
1456
1457 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1458 keyidx, encr, 0);
1459
1460 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1461 if (ctr == 1 && wpa_auth->conf.tx_status)
1462 timeout_ms = pairwise ? eapol_key_timeout_first :
1463 eapol_key_timeout_first_group;
1464 else
1465 timeout_ms = eapol_key_timeout_subseq;
1466 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1467 sm->pending_1_of_4_timeout = 1;
1468 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1469 "counter %d)", timeout_ms, ctr);
1470 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1471 wpa_send_eapol_timeout, wpa_auth, sm);
1472 }
1473
1474
wpa_verify_key_mic(struct wpa_ptk * PTK,u8 * data,size_t data_len)1475 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1476 {
1477 struct ieee802_1x_hdr *hdr;
1478 struct wpa_eapol_key *key;
1479 u16 key_info;
1480 int ret = 0;
1481 u8 mic[16];
1482
1483 if (data_len < sizeof(*hdr) + sizeof(*key))
1484 return -1;
1485
1486 hdr = (struct ieee802_1x_hdr *) data;
1487 key = (struct wpa_eapol_key *) (hdr + 1);
1488 key_info = WPA_GET_BE16(key->key_info);
1489 os_memcpy(mic, key->key_mic, 16);
1490 os_memset(key->key_mic, 0, 16);
1491 if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1492 data, data_len, key->key_mic) ||
1493 os_memcmp_const(mic, key->key_mic, 16) != 0)
1494 ret = -1;
1495 os_memcpy(key->key_mic, mic, 16);
1496 return ret;
1497 }
1498
1499
wpa_remove_ptk(struct wpa_state_machine * sm)1500 void wpa_remove_ptk(struct wpa_state_machine *sm)
1501 {
1502 sm->PTK_valid = FALSE;
1503 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1504 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1505 sm->pairwise_set = FALSE;
1506 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1507 }
1508
1509
wpa_auth_sm_event(struct wpa_state_machine * sm,wpa_event event)1510 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1511 {
1512 int remove_ptk = 1;
1513
1514 if (sm == NULL)
1515 return -1;
1516
1517 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1518 "event %d notification", event);
1519
1520 switch (event) {
1521 case WPA_AUTH:
1522 case WPA_ASSOC:
1523 break;
1524 case WPA_DEAUTH:
1525 case WPA_DISASSOC:
1526 sm->DeauthenticationRequest = TRUE;
1527 break;
1528 case WPA_REAUTH:
1529 case WPA_REAUTH_EAPOL:
1530 if (!sm->started) {
1531 /*
1532 * When using WPS, we may end up here if the STA
1533 * manages to re-associate without the previous STA
1534 * entry getting removed. Consequently, we need to make
1535 * sure that the WPA state machines gets initialized
1536 * properly at this point.
1537 */
1538 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1539 "started - initialize now");
1540 sm->started = 1;
1541 sm->Init = TRUE;
1542 if (wpa_sm_step(sm) == 1)
1543 return 1; /* should not really happen */
1544 sm->Init = FALSE;
1545 sm->AuthenticationRequest = TRUE;
1546 break;
1547 }
1548 if (sm->GUpdateStationKeys) {
1549 /*
1550 * Reauthentication cancels the pending group key
1551 * update for this STA.
1552 */
1553 sm->group->GKeyDoneStations--;
1554 sm->GUpdateStationKeys = FALSE;
1555 sm->PtkGroupInit = TRUE;
1556 }
1557 sm->ReAuthenticationRequest = TRUE;
1558 break;
1559 case WPA_ASSOC_FT:
1560 #ifdef CONFIG_IEEE80211R
1561 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1562 "after association");
1563 wpa_ft_install_ptk(sm);
1564
1565 /* Using FT protocol, not WPA auth state machine */
1566 sm->ft_completed = 1;
1567 return 0;
1568 #else /* CONFIG_IEEE80211R */
1569 break;
1570 #endif /* CONFIG_IEEE80211R */
1571 }
1572
1573 #ifdef CONFIG_IEEE80211R
1574 sm->ft_completed = 0;
1575 #endif /* CONFIG_IEEE80211R */
1576
1577 #ifdef CONFIG_IEEE80211W
1578 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1579 remove_ptk = 0;
1580 #endif /* CONFIG_IEEE80211W */
1581
1582 if (remove_ptk) {
1583 sm->PTK_valid = FALSE;
1584 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1585
1586 if (event != WPA_REAUTH_EAPOL)
1587 wpa_remove_ptk(sm);
1588 }
1589
1590 return wpa_sm_step(sm);
1591 }
1592
1593
SM_STATE(WPA_PTK,INITIALIZE)1594 SM_STATE(WPA_PTK, INITIALIZE)
1595 {
1596 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1597 if (sm->Init) {
1598 /* Init flag is not cleared here, so avoid busy
1599 * loop by claiming nothing changed. */
1600 sm->changed = FALSE;
1601 }
1602
1603 sm->keycount = 0;
1604 if (sm->GUpdateStationKeys)
1605 sm->group->GKeyDoneStations--;
1606 sm->GUpdateStationKeys = FALSE;
1607 if (sm->wpa == WPA_VERSION_WPA)
1608 sm->PInitAKeys = FALSE;
1609 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1610 * Local AA > Remote AA)) */) {
1611 sm->Pair = TRUE;
1612 }
1613 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1614 wpa_remove_ptk(sm);
1615 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1616 sm->TimeoutCtr = 0;
1617 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1618 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1619 WPA_EAPOL_authorized, 0);
1620 }
1621 }
1622
1623
SM_STATE(WPA_PTK,DISCONNECT)1624 SM_STATE(WPA_PTK, DISCONNECT)
1625 {
1626 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1627 sm->Disconnect = FALSE;
1628 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1629 }
1630
1631
SM_STATE(WPA_PTK,DISCONNECTED)1632 SM_STATE(WPA_PTK, DISCONNECTED)
1633 {
1634 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1635 sm->DeauthenticationRequest = FALSE;
1636 }
1637
1638
SM_STATE(WPA_PTK,AUTHENTICATION)1639 SM_STATE(WPA_PTK, AUTHENTICATION)
1640 {
1641 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1642 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1643 sm->PTK_valid = FALSE;
1644 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1645 1);
1646 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1647 sm->AuthenticationRequest = FALSE;
1648 }
1649
1650
wpa_group_ensure_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)1651 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1652 struct wpa_group *group)
1653 {
1654 if (group->first_sta_seen)
1655 return;
1656 /*
1657 * System has run bit further than at the time hostapd was started
1658 * potentially very early during boot up. This provides better chances
1659 * of collecting more randomness on embedded systems. Re-initialize the
1660 * GMK and Counter here to improve their strength if there was not
1661 * enough entropy available immediately after system startup.
1662 */
1663 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1664 "station");
1665 if (random_pool_ready() != 1) {
1666 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1667 "to proceed - reject first 4-way handshake");
1668 group->reject_4way_hs_for_entropy = TRUE;
1669 } else {
1670 group->first_sta_seen = TRUE;
1671 group->reject_4way_hs_for_entropy = FALSE;
1672 }
1673
1674 wpa_group_init_gmk_and_counter(wpa_auth, group);
1675 wpa_gtk_update(wpa_auth, group);
1676 wpa_group_config_group_keys(wpa_auth, group);
1677 }
1678
1679
SM_STATE(WPA_PTK,AUTHENTICATION2)1680 SM_STATE(WPA_PTK, AUTHENTICATION2)
1681 {
1682 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1683
1684 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1685 sm->ReAuthenticationRequest = FALSE;
1686
1687 /*
1688 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1689 * ambiguous. The Authenticator state machine uses a counter that is
1690 * incremented by one for each 4-way handshake. However, the security
1691 * analysis of 4-way handshake points out that unpredictable nonces
1692 * help in preventing precomputation attacks. Instead of the state
1693 * machine definition, use an unpredictable nonce value here to provide
1694 * stronger protection against potential precomputation attacks.
1695 */
1696 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1697 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1698 "ANonce.");
1699 sm->Disconnect = TRUE;
1700 return;
1701 }
1702 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1703 WPA_NONCE_LEN);
1704 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1705 * logical place than INITIALIZE since AUTHENTICATION2 can be
1706 * re-entered on ReAuthenticationRequest without going through
1707 * INITIALIZE. */
1708 sm->TimeoutCtr = 0;
1709 }
1710
1711
SM_STATE(WPA_PTK,INITPMK)1712 SM_STATE(WPA_PTK, INITPMK)
1713 {
1714 u8 msk[2 * PMK_LEN];
1715 size_t len = 2 * PMK_LEN;
1716
1717 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1718 #ifdef CONFIG_IEEE80211R
1719 sm->xxkey_len = 0;
1720 #endif /* CONFIG_IEEE80211R */
1721 if (sm->pmksa) {
1722 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1723 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1724 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1725 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1726 "(len=%lu)", (unsigned long) len);
1727 os_memcpy(sm->PMK, msk, PMK_LEN);
1728 #ifdef CONFIG_IEEE80211R
1729 if (len >= 2 * PMK_LEN) {
1730 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1731 sm->xxkey_len = PMK_LEN;
1732 }
1733 #endif /* CONFIG_IEEE80211R */
1734 } else {
1735 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1736 }
1737
1738 sm->req_replay_counter_used = 0;
1739 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1740 * will break reauthentication since EAPOL state machines may not be
1741 * get into AUTHENTICATING state that clears keyRun before WPA state
1742 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1743 * state and takes PMK from the previously used AAA Key. This will
1744 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1745 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1746 * be good workaround for this issue. */
1747 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1748 }
1749
1750
SM_STATE(WPA_PTK,INITPSK)1751 SM_STATE(WPA_PTK, INITPSK)
1752 {
1753 const u8 *psk;
1754 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1755 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1756 if (psk) {
1757 os_memcpy(sm->PMK, psk, PMK_LEN);
1758 #ifdef CONFIG_IEEE80211R
1759 os_memcpy(sm->xxkey, psk, PMK_LEN);
1760 sm->xxkey_len = PMK_LEN;
1761 #endif /* CONFIG_IEEE80211R */
1762 }
1763 sm->req_replay_counter_used = 0;
1764 }
1765
1766
SM_STATE(WPA_PTK,PTKSTART)1767 SM_STATE(WPA_PTK, PTKSTART)
1768 {
1769 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1770 size_t pmkid_len = 0;
1771
1772 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1773 sm->PTKRequest = FALSE;
1774 sm->TimeoutEvt = FALSE;
1775
1776 sm->TimeoutCtr++;
1777 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1778 /* No point in sending the EAPOL-Key - we will disconnect
1779 * immediately following this. */
1780 return;
1781 }
1782
1783 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1784 "sending 1/4 msg of 4-Way Handshake");
1785 /*
1786 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1787 * one possible PSK for this STA.
1788 */
1789 if (sm->wpa == WPA_VERSION_WPA2 &&
1790 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
1791 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
1792 pmkid = buf;
1793 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1794 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1795 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1796 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1797 if (sm->pmksa)
1798 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1799 sm->pmksa->pmkid, PMKID_LEN);
1800 else {
1801 /*
1802 * Calculate PMKID since no PMKSA cache entry was
1803 * available with pre-calculated PMKID.
1804 */
1805 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1806 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1807 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1808 }
1809 }
1810 wpa_send_eapol(sm->wpa_auth, sm,
1811 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1812 sm->ANonce, pmkid, pmkid_len, 0, 0);
1813 }
1814
1815
wpa_derive_ptk(struct wpa_state_machine * sm,const u8 * pmk,struct wpa_ptk * ptk)1816 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1817 struct wpa_ptk *ptk)
1818 {
1819 size_t ptk_len = wpa_cipher_key_len(sm->pairwise) + 32;
1820 #ifdef CONFIG_IEEE80211R
1821 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1822 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1823 #endif /* CONFIG_IEEE80211R */
1824
1825 wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1826 sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1827 (u8 *) ptk, ptk_len,
1828 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1829
1830 return 0;
1831 }
1832
1833
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING)1834 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1835 {
1836 struct wpa_ptk PTK;
1837 int ok = 0;
1838 const u8 *pmk = NULL;
1839
1840 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1841 sm->EAPOLKeyReceived = FALSE;
1842 sm->update_snonce = FALSE;
1843
1844 /* WPA with IEEE 802.1X: use the derived PMK from EAP
1845 * WPA-PSK: iterate through possible PSKs and select the one matching
1846 * the packet */
1847 for (;;) {
1848 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1849 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
1850 sm->p2p_dev_addr, pmk);
1851 if (pmk == NULL)
1852 break;
1853 } else
1854 pmk = sm->PMK;
1855
1856 wpa_derive_ptk(sm, pmk, &PTK);
1857
1858 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1859 sm->last_rx_eapol_key_len) == 0) {
1860 ok = 1;
1861 break;
1862 }
1863
1864 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1865 break;
1866 }
1867
1868 if (!ok) {
1869 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1870 "invalid MIC in msg 2/4 of 4-Way Handshake");
1871 return;
1872 }
1873
1874 #ifdef CONFIG_IEEE80211R
1875 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1876 /*
1877 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1878 * with the value we derived.
1879 */
1880 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1881 WPA_PMK_NAME_LEN) != 0) {
1882 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1883 "PMKR1Name mismatch in FT 4-way "
1884 "handshake");
1885 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1886 "Supplicant",
1887 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1888 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1889 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1890 return;
1891 }
1892 }
1893 #endif /* CONFIG_IEEE80211R */
1894
1895 sm->pending_1_of_4_timeout = 0;
1896 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1897
1898 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1899 /* PSK may have changed from the previous choice, so update
1900 * state machine data based on whatever PSK was selected here.
1901 */
1902 os_memcpy(sm->PMK, pmk, PMK_LEN);
1903 }
1904
1905 sm->MICVerified = TRUE;
1906
1907 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1908 sm->PTK_valid = TRUE;
1909 }
1910
1911
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING2)1912 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1913 {
1914 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1915 sm->TimeoutCtr = 0;
1916 }
1917
1918
1919 #ifdef CONFIG_IEEE80211W
1920
ieee80211w_kde_len(struct wpa_state_machine * sm)1921 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1922 {
1923 if (sm->mgmt_frame_prot) {
1924 size_t len;
1925 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
1926 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
1927 }
1928
1929 return 0;
1930 }
1931
1932
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)1933 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1934 {
1935 struct wpa_igtk_kde igtk;
1936 struct wpa_group *gsm = sm->group;
1937 u8 rsc[WPA_KEY_RSC_LEN];
1938 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
1939
1940 if (!sm->mgmt_frame_prot)
1941 return pos;
1942
1943 igtk.keyid[0] = gsm->GN_igtk;
1944 igtk.keyid[1] = 0;
1945 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1946 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
1947 os_memset(igtk.pn, 0, sizeof(igtk.pn));
1948 else
1949 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
1950 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
1951 if (sm->wpa_auth->conf.disable_gtk) {
1952 /*
1953 * Provide unique random IGTK to each STA to prevent use of
1954 * IGTK in the BSS.
1955 */
1956 if (random_get_bytes(igtk.igtk, len) < 0)
1957 return pos;
1958 }
1959 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1960 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
1961 NULL, 0);
1962
1963 return pos;
1964 }
1965
1966 #else /* CONFIG_IEEE80211W */
1967
ieee80211w_kde_len(struct wpa_state_machine * sm)1968 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1969 {
1970 return 0;
1971 }
1972
1973
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)1974 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1975 {
1976 return pos;
1977 }
1978
1979 #endif /* CONFIG_IEEE80211W */
1980
1981
SM_STATE(WPA_PTK,PTKINITNEGOTIATING)1982 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1983 {
1984 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
1985 size_t gtk_len, kde_len;
1986 struct wpa_group *gsm = sm->group;
1987 u8 *wpa_ie;
1988 int wpa_ie_len, secure, keyidx, encr = 0;
1989
1990 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1991 sm->TimeoutEvt = FALSE;
1992
1993 sm->TimeoutCtr++;
1994 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1995 /* No point in sending the EAPOL-Key - we will disconnect
1996 * immediately following this. */
1997 return;
1998 }
1999
2000 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
2001 GTK[GN], IGTK, [FTIE], [TIE * 2])
2002 */
2003 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2004 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2005 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
2006 wpa_ie = sm->wpa_auth->wpa_ie;
2007 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
2008 if (sm->wpa == WPA_VERSION_WPA &&
2009 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
2010 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
2011 /* WPA-only STA, remove RSN IE */
2012 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2013 wpa_ie_len = wpa_ie[1] + 2;
2014 }
2015 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2016 "sending 3/4 msg of 4-Way Handshake");
2017 if (sm->wpa == WPA_VERSION_WPA2) {
2018 /* WPA2 send GTK in the 4-way handshake */
2019 secure = 1;
2020 gtk = gsm->GTK[gsm->GN - 1];
2021 gtk_len = gsm->GTK_len;
2022 if (sm->wpa_auth->conf.disable_gtk) {
2023 /*
2024 * Provide unique random GTK to each STA to prevent use
2025 * of GTK in the BSS.
2026 */
2027 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2028 return;
2029 gtk = dummy_gtk;
2030 }
2031 keyidx = gsm->GN;
2032 _rsc = rsc;
2033 encr = 1;
2034 } else {
2035 /* WPA does not include GTK in msg 3/4 */
2036 secure = 0;
2037 gtk = NULL;
2038 gtk_len = 0;
2039 keyidx = 0;
2040 _rsc = NULL;
2041 if (sm->rx_eapol_key_secure) {
2042 /*
2043 * It looks like Windows 7 supplicant tries to use
2044 * Secure bit in msg 2/4 after having reported Michael
2045 * MIC failure and it then rejects the 4-way handshake
2046 * if msg 3/4 does not set Secure bit. Work around this
2047 * by setting the Secure bit here even in the case of
2048 * WPA if the supplicant used it first.
2049 */
2050 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2051 "STA used Secure bit in WPA msg 2/4 - "
2052 "set Secure for 3/4 as workaround");
2053 secure = 1;
2054 }
2055 }
2056
2057 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2058 if (gtk)
2059 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2060 #ifdef CONFIG_IEEE80211R
2061 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2062 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2063 kde_len += 300; /* FTIE + 2 * TIE */
2064 }
2065 #endif /* CONFIG_IEEE80211R */
2066 #ifdef CONFIG_P2P
2067 if (WPA_GET_BE32(sm->ip_addr) > 0)
2068 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2069 #endif /* CONFIG_P2P */
2070 kde = os_malloc(kde_len);
2071 if (kde == NULL)
2072 return;
2073
2074 pos = kde;
2075 os_memcpy(pos, wpa_ie, wpa_ie_len);
2076 pos += wpa_ie_len;
2077 #ifdef CONFIG_IEEE80211R
2078 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2079 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
2080 if (res < 0) {
2081 wpa_printf(MSG_ERROR, "FT: Failed to insert "
2082 "PMKR1Name into RSN IE in EAPOL-Key data");
2083 os_free(kde);
2084 return;
2085 }
2086 pos += res;
2087 }
2088 #endif /* CONFIG_IEEE80211R */
2089 if (gtk) {
2090 u8 hdr[2];
2091 hdr[0] = keyidx & 0x03;
2092 hdr[1] = 0;
2093 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2094 gtk, gtk_len);
2095 }
2096 pos = ieee80211w_kde_add(sm, pos);
2097
2098 #ifdef CONFIG_IEEE80211R
2099 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2100 int res;
2101 struct wpa_auth_config *conf;
2102
2103 conf = &sm->wpa_auth->conf;
2104 res = wpa_write_ftie(conf, conf->r0_key_holder,
2105 conf->r0_key_holder_len,
2106 NULL, NULL, pos, kde + kde_len - pos,
2107 NULL, 0);
2108 if (res < 0) {
2109 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2110 "into EAPOL-Key Key Data");
2111 os_free(kde);
2112 return;
2113 }
2114 pos += res;
2115
2116 /* TIE[ReassociationDeadline] (TU) */
2117 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2118 *pos++ = 5;
2119 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2120 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2121 pos += 4;
2122
2123 /* TIE[KeyLifetime] (seconds) */
2124 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2125 *pos++ = 5;
2126 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2127 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2128 pos += 4;
2129 }
2130 #endif /* CONFIG_IEEE80211R */
2131 #ifdef CONFIG_P2P
2132 if (WPA_GET_BE32(sm->ip_addr) > 0) {
2133 u8 addr[3 * 4];
2134 os_memcpy(addr, sm->ip_addr, 4);
2135 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2136 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2137 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2138 addr, sizeof(addr), NULL, 0);
2139 }
2140 #endif /* CONFIG_P2P */
2141
2142 wpa_send_eapol(sm->wpa_auth, sm,
2143 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2144 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2145 WPA_KEY_INFO_KEY_TYPE,
2146 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2147 os_free(kde);
2148 }
2149
2150
SM_STATE(WPA_PTK,PTKINITDONE)2151 SM_STATE(WPA_PTK, PTKINITDONE)
2152 {
2153 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2154 sm->EAPOLKeyReceived = FALSE;
2155 if (sm->Pair) {
2156 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2157 int klen = wpa_cipher_key_len(sm->pairwise);
2158 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2159 sm->PTK.tk1, klen)) {
2160 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2161 return;
2162 }
2163 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2164 sm->pairwise_set = TRUE;
2165
2166 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2167 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2168 eloop_register_timeout(sm->wpa_auth->conf.
2169 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2170 sm->wpa_auth, sm);
2171 }
2172
2173 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2174 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2175 WPA_EAPOL_authorized, 1);
2176 }
2177 }
2178
2179 if (0 /* IBSS == TRUE */) {
2180 sm->keycount++;
2181 if (sm->keycount == 2) {
2182 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2183 WPA_EAPOL_portValid, 1);
2184 }
2185 } else {
2186 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2187 1);
2188 }
2189 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2190 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2191 if (sm->wpa == WPA_VERSION_WPA)
2192 sm->PInitAKeys = TRUE;
2193 else
2194 sm->has_GTK = TRUE;
2195 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2196 "pairwise key handshake completed (%s)",
2197 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2198
2199 #ifdef CONFIG_IEEE80211R
2200 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2201 #endif /* CONFIG_IEEE80211R */
2202 }
2203
2204
SM_STEP(WPA_PTK)2205 SM_STEP(WPA_PTK)
2206 {
2207 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2208
2209 if (sm->Init)
2210 SM_ENTER(WPA_PTK, INITIALIZE);
2211 else if (sm->Disconnect
2212 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2213 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2214 "WPA_PTK: sm->Disconnect");
2215 SM_ENTER(WPA_PTK, DISCONNECT);
2216 }
2217 else if (sm->DeauthenticationRequest)
2218 SM_ENTER(WPA_PTK, DISCONNECTED);
2219 else if (sm->AuthenticationRequest)
2220 SM_ENTER(WPA_PTK, AUTHENTICATION);
2221 else if (sm->ReAuthenticationRequest)
2222 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2223 else if (sm->PTKRequest)
2224 SM_ENTER(WPA_PTK, PTKSTART);
2225 else switch (sm->wpa_ptk_state) {
2226 case WPA_PTK_INITIALIZE:
2227 break;
2228 case WPA_PTK_DISCONNECT:
2229 SM_ENTER(WPA_PTK, DISCONNECTED);
2230 break;
2231 case WPA_PTK_DISCONNECTED:
2232 SM_ENTER(WPA_PTK, INITIALIZE);
2233 break;
2234 case WPA_PTK_AUTHENTICATION:
2235 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2236 break;
2237 case WPA_PTK_AUTHENTICATION2:
2238 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2239 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2240 WPA_EAPOL_keyRun) > 0)
2241 SM_ENTER(WPA_PTK, INITPMK);
2242 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2243 /* FIX: && 802.1X::keyRun */)
2244 SM_ENTER(WPA_PTK, INITPSK);
2245 break;
2246 case WPA_PTK_INITPMK:
2247 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2248 WPA_EAPOL_keyAvailable) > 0)
2249 SM_ENTER(WPA_PTK, PTKSTART);
2250 else {
2251 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2252 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2253 "INITPMK - keyAvailable = false");
2254 SM_ENTER(WPA_PTK, DISCONNECT);
2255 }
2256 break;
2257 case WPA_PTK_INITPSK:
2258 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2259 NULL))
2260 SM_ENTER(WPA_PTK, PTKSTART);
2261 else {
2262 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2263 "no PSK configured for the STA");
2264 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2265 SM_ENTER(WPA_PTK, DISCONNECT);
2266 }
2267 break;
2268 case WPA_PTK_PTKSTART:
2269 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2270 sm->EAPOLKeyPairwise)
2271 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2272 else if (sm->TimeoutCtr >
2273 (int) dot11RSNAConfigPairwiseUpdateCount) {
2274 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2275 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2276 "PTKSTART: Retry limit %d reached",
2277 dot11RSNAConfigPairwiseUpdateCount);
2278 SM_ENTER(WPA_PTK, DISCONNECT);
2279 } else if (sm->TimeoutEvt)
2280 SM_ENTER(WPA_PTK, PTKSTART);
2281 break;
2282 case WPA_PTK_PTKCALCNEGOTIATING:
2283 if (sm->MICVerified)
2284 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2285 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2286 sm->EAPOLKeyPairwise)
2287 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2288 else if (sm->TimeoutEvt)
2289 SM_ENTER(WPA_PTK, PTKSTART);
2290 break;
2291 case WPA_PTK_PTKCALCNEGOTIATING2:
2292 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2293 break;
2294 case WPA_PTK_PTKINITNEGOTIATING:
2295 if (sm->update_snonce)
2296 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2297 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2298 sm->EAPOLKeyPairwise && sm->MICVerified)
2299 SM_ENTER(WPA_PTK, PTKINITDONE);
2300 else if (sm->TimeoutCtr >
2301 (int) dot11RSNAConfigPairwiseUpdateCount) {
2302 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2303 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2304 "PTKINITNEGOTIATING: Retry limit %d "
2305 "reached",
2306 dot11RSNAConfigPairwiseUpdateCount);
2307 SM_ENTER(WPA_PTK, DISCONNECT);
2308 } else if (sm->TimeoutEvt)
2309 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2310 break;
2311 case WPA_PTK_PTKINITDONE:
2312 break;
2313 }
2314 }
2315
2316
SM_STATE(WPA_PTK_GROUP,IDLE)2317 SM_STATE(WPA_PTK_GROUP, IDLE)
2318 {
2319 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2320 if (sm->Init) {
2321 /* Init flag is not cleared here, so avoid busy
2322 * loop by claiming nothing changed. */
2323 sm->changed = FALSE;
2324 }
2325 sm->GTimeoutCtr = 0;
2326 }
2327
2328
SM_STATE(WPA_PTK_GROUP,REKEYNEGOTIATING)2329 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2330 {
2331 u8 rsc[WPA_KEY_RSC_LEN];
2332 struct wpa_group *gsm = sm->group;
2333 u8 *kde, *pos, hdr[2];
2334 size_t kde_len;
2335 u8 *gtk, dummy_gtk[32];
2336
2337 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2338
2339 sm->GTimeoutCtr++;
2340 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2341 /* No point in sending the EAPOL-Key - we will disconnect
2342 * immediately following this. */
2343 return;
2344 }
2345
2346 if (sm->wpa == WPA_VERSION_WPA)
2347 sm->PInitAKeys = FALSE;
2348 sm->TimeoutEvt = FALSE;
2349 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2350 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2351 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2352 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2353 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2354 "sending 1/2 msg of Group Key Handshake");
2355
2356 gtk = gsm->GTK[gsm->GN - 1];
2357 if (sm->wpa_auth->conf.disable_gtk) {
2358 /*
2359 * Provide unique random GTK to each STA to prevent use
2360 * of GTK in the BSS.
2361 */
2362 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2363 return;
2364 gtk = dummy_gtk;
2365 }
2366 if (sm->wpa == WPA_VERSION_WPA2) {
2367 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2368 ieee80211w_kde_len(sm);
2369 kde = os_malloc(kde_len);
2370 if (kde == NULL)
2371 return;
2372
2373 pos = kde;
2374 hdr[0] = gsm->GN & 0x03;
2375 hdr[1] = 0;
2376 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2377 gtk, gsm->GTK_len);
2378 pos = ieee80211w_kde_add(sm, pos);
2379 } else {
2380 kde = gtk;
2381 pos = kde + gsm->GTK_len;
2382 }
2383
2384 wpa_send_eapol(sm->wpa_auth, sm,
2385 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2386 WPA_KEY_INFO_ACK |
2387 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2388 rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2389 if (sm->wpa == WPA_VERSION_WPA2)
2390 os_free(kde);
2391 }
2392
2393
SM_STATE(WPA_PTK_GROUP,REKEYESTABLISHED)2394 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2395 {
2396 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2397 sm->EAPOLKeyReceived = FALSE;
2398 if (sm->GUpdateStationKeys)
2399 sm->group->GKeyDoneStations--;
2400 sm->GUpdateStationKeys = FALSE;
2401 sm->GTimeoutCtr = 0;
2402 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2403 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2404 "group key handshake completed (%s)",
2405 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2406 sm->has_GTK = TRUE;
2407 }
2408
2409
SM_STATE(WPA_PTK_GROUP,KEYERROR)2410 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2411 {
2412 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2413 if (sm->GUpdateStationKeys)
2414 sm->group->GKeyDoneStations--;
2415 sm->GUpdateStationKeys = FALSE;
2416 sm->Disconnect = TRUE;
2417 }
2418
2419
SM_STEP(WPA_PTK_GROUP)2420 SM_STEP(WPA_PTK_GROUP)
2421 {
2422 if (sm->Init || sm->PtkGroupInit) {
2423 SM_ENTER(WPA_PTK_GROUP, IDLE);
2424 sm->PtkGroupInit = FALSE;
2425 } else switch (sm->wpa_ptk_group_state) {
2426 case WPA_PTK_GROUP_IDLE:
2427 if (sm->GUpdateStationKeys ||
2428 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2429 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2430 break;
2431 case WPA_PTK_GROUP_REKEYNEGOTIATING:
2432 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2433 !sm->EAPOLKeyPairwise && sm->MICVerified)
2434 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2435 else if (sm->GTimeoutCtr >
2436 (int) dot11RSNAConfigGroupUpdateCount)
2437 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2438 else if (sm->TimeoutEvt)
2439 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2440 break;
2441 case WPA_PTK_GROUP_KEYERROR:
2442 SM_ENTER(WPA_PTK_GROUP, IDLE);
2443 break;
2444 case WPA_PTK_GROUP_REKEYESTABLISHED:
2445 SM_ENTER(WPA_PTK_GROUP, IDLE);
2446 break;
2447 }
2448 }
2449
2450
wpa_gtk_update(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2451 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2452 struct wpa_group *group)
2453 {
2454 int ret = 0;
2455
2456 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2457 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2458 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2459 wpa_auth->addr, group->GNonce,
2460 group->GTK[group->GN - 1], group->GTK_len) < 0)
2461 ret = -1;
2462 wpa_hexdump_key(MSG_DEBUG, "GTK",
2463 group->GTK[group->GN - 1], group->GTK_len);
2464
2465 #ifdef CONFIG_IEEE80211W
2466 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2467 size_t len;
2468 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2469 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2470 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2471 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2472 wpa_auth->addr, group->GNonce,
2473 group->IGTK[group->GN_igtk - 4], len) < 0)
2474 ret = -1;
2475 wpa_hexdump_key(MSG_DEBUG, "IGTK",
2476 group->IGTK[group->GN_igtk - 4], len);
2477 }
2478 #endif /* CONFIG_IEEE80211W */
2479
2480 return ret;
2481 }
2482
2483
wpa_group_gtk_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2484 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2485 struct wpa_group *group)
2486 {
2487 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2488 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2489 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2490 group->wpa_group_state = WPA_GROUP_GTK_INIT;
2491
2492 /* GTK[0..N] = 0 */
2493 os_memset(group->GTK, 0, sizeof(group->GTK));
2494 group->GN = 1;
2495 group->GM = 2;
2496 #ifdef CONFIG_IEEE80211W
2497 group->GN_igtk = 4;
2498 group->GM_igtk = 5;
2499 #endif /* CONFIG_IEEE80211W */
2500 /* GTK[GN] = CalcGTK() */
2501 wpa_gtk_update(wpa_auth, group);
2502 }
2503
2504
wpa_group_update_sta(struct wpa_state_machine * sm,void * ctx)2505 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2506 {
2507 if (ctx != NULL && ctx != sm->group)
2508 return 0;
2509
2510 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2511 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2512 "Not in PTKINITDONE; skip Group Key update");
2513 sm->GUpdateStationKeys = FALSE;
2514 return 0;
2515 }
2516 if (sm->GUpdateStationKeys) {
2517 /*
2518 * This should not really happen, so add a debug log entry.
2519 * Since we clear the GKeyDoneStations before the loop, the
2520 * station needs to be counted here anyway.
2521 */
2522 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2523 "GUpdateStationKeys was already set when "
2524 "marking station for GTK rekeying");
2525 }
2526
2527 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
2528 if (sm->is_wnmsleep)
2529 return 0;
2530
2531 sm->group->GKeyDoneStations++;
2532 sm->GUpdateStationKeys = TRUE;
2533
2534 wpa_sm_step(sm);
2535 return 0;
2536 }
2537
2538
2539 #ifdef CONFIG_WNM
2540 /* update GTK when exiting WNM-Sleep Mode */
wpa_wnmsleep_rekey_gtk(struct wpa_state_machine * sm)2541 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2542 {
2543 if (sm == NULL || sm->is_wnmsleep)
2544 return;
2545
2546 wpa_group_update_sta(sm, NULL);
2547 }
2548
2549
wpa_set_wnmsleep(struct wpa_state_machine * sm,int flag)2550 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2551 {
2552 if (sm)
2553 sm->is_wnmsleep = !!flag;
2554 }
2555
2556
wpa_wnmsleep_gtk_subelem(struct wpa_state_machine * sm,u8 * pos)2557 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2558 {
2559 struct wpa_group *gsm = sm->group;
2560 u8 *start = pos;
2561
2562 /*
2563 * GTK subelement:
2564 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2565 * Key[5..32]
2566 */
2567 *pos++ = WNM_SLEEP_SUBELEM_GTK;
2568 *pos++ = 11 + gsm->GTK_len;
2569 /* Key ID in B0-B1 of Key Info */
2570 WPA_PUT_LE16(pos, gsm->GN & 0x03);
2571 pos += 2;
2572 *pos++ = gsm->GTK_len;
2573 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
2574 return 0;
2575 pos += 8;
2576 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2577 pos += gsm->GTK_len;
2578
2579 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
2580 gsm->GN);
2581 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
2582 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2583
2584 return pos - start;
2585 }
2586
2587
2588 #ifdef CONFIG_IEEE80211W
wpa_wnmsleep_igtk_subelem(struct wpa_state_machine * sm,u8 * pos)2589 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2590 {
2591 struct wpa_group *gsm = sm->group;
2592 u8 *start = pos;
2593 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2594
2595 /*
2596 * IGTK subelement:
2597 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
2598 */
2599 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
2600 *pos++ = 2 + 6 + len;
2601 WPA_PUT_LE16(pos, gsm->GN_igtk);
2602 pos += 2;
2603 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
2604 return 0;
2605 pos += 6;
2606
2607 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
2608 pos += len;
2609
2610 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
2611 gsm->GN_igtk);
2612 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
2613 gsm->IGTK[gsm->GN_igtk - 4], len);
2614
2615 return pos - start;
2616 }
2617 #endif /* CONFIG_IEEE80211W */
2618 #endif /* CONFIG_WNM */
2619
2620
wpa_group_setkeys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2621 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2622 struct wpa_group *group)
2623 {
2624 int tmp;
2625
2626 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2627 "SETKEYS (VLAN-ID %d)", group->vlan_id);
2628 group->changed = TRUE;
2629 group->wpa_group_state = WPA_GROUP_SETKEYS;
2630 group->GTKReKey = FALSE;
2631 tmp = group->GM;
2632 group->GM = group->GN;
2633 group->GN = tmp;
2634 #ifdef CONFIG_IEEE80211W
2635 tmp = group->GM_igtk;
2636 group->GM_igtk = group->GN_igtk;
2637 group->GN_igtk = tmp;
2638 #endif /* CONFIG_IEEE80211W */
2639 /* "GKeyDoneStations = GNoStations" is done in more robust way by
2640 * counting the STAs that are marked with GUpdateStationKeys instead of
2641 * including all STAs that could be in not-yet-completed state. */
2642 wpa_gtk_update(wpa_auth, group);
2643
2644 if (group->GKeyDoneStations) {
2645 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2646 "GKeyDoneStations=%d when starting new GTK rekey",
2647 group->GKeyDoneStations);
2648 group->GKeyDoneStations = 0;
2649 }
2650 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
2651 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2652 group->GKeyDoneStations);
2653 }
2654
2655
wpa_group_config_group_keys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2656 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2657 struct wpa_group *group)
2658 {
2659 int ret = 0;
2660
2661 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2662 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
2663 broadcast_ether_addr, group->GN,
2664 group->GTK[group->GN - 1], group->GTK_len) < 0)
2665 ret = -1;
2666
2667 #ifdef CONFIG_IEEE80211W
2668 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2669 enum wpa_alg alg;
2670 size_t len;
2671
2672 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
2673 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2674
2675 if (ret == 0 &&
2676 wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
2677 broadcast_ether_addr, group->GN_igtk,
2678 group->IGTK[group->GN_igtk - 4], len) < 0)
2679 ret = -1;
2680 }
2681 #endif /* CONFIG_IEEE80211W */
2682
2683 return ret;
2684 }
2685
2686
wpa_group_disconnect_cb(struct wpa_state_machine * sm,void * ctx)2687 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
2688 {
2689 if (sm->group == ctx) {
2690 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
2691 " for discconnection due to fatal failure",
2692 MAC2STR(sm->addr));
2693 sm->Disconnect = TRUE;
2694 }
2695
2696 return 0;
2697 }
2698
2699
wpa_group_fatal_failure(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2700 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
2701 struct wpa_group *group)
2702 {
2703 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
2704 group->changed = TRUE;
2705 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
2706 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
2707 }
2708
2709
wpa_group_setkeysdone(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2710 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2711 struct wpa_group *group)
2712 {
2713 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2714 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2715 group->changed = TRUE;
2716 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2717
2718 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
2719 wpa_group_fatal_failure(wpa_auth, group);
2720 return -1;
2721 }
2722
2723 return 0;
2724 }
2725
2726
wpa_group_sm_step(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2727 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2728 struct wpa_group *group)
2729 {
2730 if (group->GInit) {
2731 wpa_group_gtk_init(wpa_auth, group);
2732 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
2733 /* Do not allow group operations */
2734 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2735 group->GTKAuthenticator) {
2736 wpa_group_setkeysdone(wpa_auth, group);
2737 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2738 group->GTKReKey) {
2739 wpa_group_setkeys(wpa_auth, group);
2740 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2741 if (group->GKeyDoneStations == 0)
2742 wpa_group_setkeysdone(wpa_auth, group);
2743 else if (group->GTKReKey)
2744 wpa_group_setkeys(wpa_auth, group);
2745 }
2746 }
2747
2748
wpa_sm_step(struct wpa_state_machine * sm)2749 static int wpa_sm_step(struct wpa_state_machine *sm)
2750 {
2751 if (sm == NULL)
2752 return 0;
2753
2754 if (sm->in_step_loop) {
2755 /* This should not happen, but if it does, make sure we do not
2756 * end up freeing the state machine too early by exiting the
2757 * recursive call. */
2758 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2759 return 0;
2760 }
2761
2762 sm->in_step_loop = 1;
2763 do {
2764 if (sm->pending_deinit)
2765 break;
2766
2767 sm->changed = FALSE;
2768 sm->wpa_auth->group->changed = FALSE;
2769
2770 SM_STEP_RUN(WPA_PTK);
2771 if (sm->pending_deinit)
2772 break;
2773 SM_STEP_RUN(WPA_PTK_GROUP);
2774 if (sm->pending_deinit)
2775 break;
2776 wpa_group_sm_step(sm->wpa_auth, sm->group);
2777 } while (sm->changed || sm->wpa_auth->group->changed);
2778 sm->in_step_loop = 0;
2779
2780 if (sm->pending_deinit) {
2781 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2782 "machine deinit for " MACSTR, MAC2STR(sm->addr));
2783 wpa_free_sta_sm(sm);
2784 return 1;
2785 }
2786 return 0;
2787 }
2788
2789
wpa_sm_call_step(void * eloop_ctx,void * timeout_ctx)2790 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2791 {
2792 struct wpa_state_machine *sm = eloop_ctx;
2793 wpa_sm_step(sm);
2794 }
2795
2796
wpa_auth_sm_notify(struct wpa_state_machine * sm)2797 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2798 {
2799 if (sm == NULL)
2800 return;
2801 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2802 }
2803
2804
wpa_gtk_rekey(struct wpa_authenticator * wpa_auth)2805 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2806 {
2807 int tmp, i;
2808 struct wpa_group *group;
2809
2810 if (wpa_auth == NULL)
2811 return;
2812
2813 group = wpa_auth->group;
2814
2815 for (i = 0; i < 2; i++) {
2816 tmp = group->GM;
2817 group->GM = group->GN;
2818 group->GN = tmp;
2819 #ifdef CONFIG_IEEE80211W
2820 tmp = group->GM_igtk;
2821 group->GM_igtk = group->GN_igtk;
2822 group->GN_igtk = tmp;
2823 #endif /* CONFIG_IEEE80211W */
2824 wpa_gtk_update(wpa_auth, group);
2825 wpa_group_config_group_keys(wpa_auth, group);
2826 }
2827 }
2828
2829
wpa_bool_txt(int bool)2830 static const char * wpa_bool_txt(int bool)
2831 {
2832 return bool ? "TRUE" : "FALSE";
2833 }
2834
2835
2836 #define RSN_SUITE "%02x-%02x-%02x-%d"
2837 #define RSN_SUITE_ARG(s) \
2838 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2839
wpa_get_mib(struct wpa_authenticator * wpa_auth,char * buf,size_t buflen)2840 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2841 {
2842 int len = 0, ret;
2843 char pmkid_txt[PMKID_LEN * 2 + 1];
2844 #ifdef CONFIG_RSN_PREAUTH
2845 const int preauth = 1;
2846 #else /* CONFIG_RSN_PREAUTH */
2847 const int preauth = 0;
2848 #endif /* CONFIG_RSN_PREAUTH */
2849
2850 if (wpa_auth == NULL)
2851 return len;
2852
2853 ret = os_snprintf(buf + len, buflen - len,
2854 "dot11RSNAOptionImplemented=TRUE\n"
2855 "dot11RSNAPreauthenticationImplemented=%s\n"
2856 "dot11RSNAEnabled=%s\n"
2857 "dot11RSNAPreauthenticationEnabled=%s\n",
2858 wpa_bool_txt(preauth),
2859 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2860 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2861 if (ret < 0 || (size_t) ret >= buflen - len)
2862 return len;
2863 len += ret;
2864
2865 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2866 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2867
2868 ret = os_snprintf(
2869 buf + len, buflen - len,
2870 "dot11RSNAConfigVersion=%u\n"
2871 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
2872 /* FIX: dot11RSNAConfigGroupCipher */
2873 /* FIX: dot11RSNAConfigGroupRekeyMethod */
2874 /* FIX: dot11RSNAConfigGroupRekeyTime */
2875 /* FIX: dot11RSNAConfigGroupRekeyPackets */
2876 "dot11RSNAConfigGroupRekeyStrict=%u\n"
2877 "dot11RSNAConfigGroupUpdateCount=%u\n"
2878 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
2879 "dot11RSNAConfigGroupCipherSize=%u\n"
2880 "dot11RSNAConfigPMKLifetime=%u\n"
2881 "dot11RSNAConfigPMKReauthThreshold=%u\n"
2882 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2883 "dot11RSNAConfigSATimeout=%u\n"
2884 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2885 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2886 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2887 "dot11RSNAPMKIDUsed=%s\n"
2888 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2889 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2890 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2891 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2892 "dot11RSNA4WayHandshakeFailures=%u\n"
2893 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2894 RSN_VERSION,
2895 !!wpa_auth->conf.wpa_strict_rekey,
2896 dot11RSNAConfigGroupUpdateCount,
2897 dot11RSNAConfigPairwiseUpdateCount,
2898 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
2899 dot11RSNAConfigPMKLifetime,
2900 dot11RSNAConfigPMKReauthThreshold,
2901 dot11RSNAConfigSATimeout,
2902 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2903 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2904 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2905 pmkid_txt,
2906 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2907 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2908 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2909 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2910 wpa_auth->dot11RSNA4WayHandshakeFailures);
2911 if (ret < 0 || (size_t) ret >= buflen - len)
2912 return len;
2913 len += ret;
2914
2915 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
2916 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2917
2918 /* Private MIB */
2919 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2920 wpa_auth->group->wpa_group_state);
2921 if (ret < 0 || (size_t) ret >= buflen - len)
2922 return len;
2923 len += ret;
2924
2925 return len;
2926 }
2927
2928
wpa_get_mib_sta(struct wpa_state_machine * sm,char * buf,size_t buflen)2929 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2930 {
2931 int len = 0, ret;
2932 u32 pairwise = 0;
2933
2934 if (sm == NULL)
2935 return 0;
2936
2937 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2938
2939 /* dot11RSNAStatsEntry */
2940
2941 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
2942 WPA_PROTO_RSN : WPA_PROTO_WPA,
2943 sm->pairwise);
2944 if (pairwise == 0)
2945 return 0;
2946
2947 ret = os_snprintf(
2948 buf + len, buflen - len,
2949 /* TODO: dot11RSNAStatsIndex */
2950 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
2951 "dot11RSNAStatsVersion=1\n"
2952 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2953 /* TODO: dot11RSNAStatsTKIPICVErrors */
2954 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2955 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2956 /* TODO: dot11RSNAStatsCCMPReplays */
2957 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
2958 /* TODO: dot11RSNAStatsTKIPReplays */,
2959 MAC2STR(sm->addr),
2960 RSN_SUITE_ARG(pairwise),
2961 sm->dot11RSNAStatsTKIPLocalMICFailures,
2962 sm->dot11RSNAStatsTKIPRemoteMICFailures);
2963 if (ret < 0 || (size_t) ret >= buflen - len)
2964 return len;
2965 len += ret;
2966
2967 /* Private MIB */
2968 ret = os_snprintf(buf + len, buflen - len,
2969 "hostapdWPAPTKState=%d\n"
2970 "hostapdWPAPTKGroupState=%d\n",
2971 sm->wpa_ptk_state,
2972 sm->wpa_ptk_group_state);
2973 if (ret < 0 || (size_t) ret >= buflen - len)
2974 return len;
2975 len += ret;
2976
2977 return len;
2978 }
2979
2980
wpa_auth_countermeasures_start(struct wpa_authenticator * wpa_auth)2981 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2982 {
2983 if (wpa_auth)
2984 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2985 }
2986
2987
wpa_auth_pairwise_set(struct wpa_state_machine * sm)2988 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2989 {
2990 return sm && sm->pairwise_set;
2991 }
2992
2993
wpa_auth_get_pairwise(struct wpa_state_machine * sm)2994 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2995 {
2996 return sm->pairwise;
2997 }
2998
2999
wpa_auth_sta_key_mgmt(struct wpa_state_machine * sm)3000 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
3001 {
3002 if (sm == NULL)
3003 return -1;
3004 return sm->wpa_key_mgmt;
3005 }
3006
3007
wpa_auth_sta_wpa_version(struct wpa_state_machine * sm)3008 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
3009 {
3010 if (sm == NULL)
3011 return 0;
3012 return sm->wpa;
3013 }
3014
3015
wpa_auth_sta_clear_pmksa(struct wpa_state_machine * sm,struct rsn_pmksa_cache_entry * entry)3016 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
3017 struct rsn_pmksa_cache_entry *entry)
3018 {
3019 if (sm == NULL || sm->pmksa != entry)
3020 return -1;
3021 sm->pmksa = NULL;
3022 return 0;
3023 }
3024
3025
3026 struct rsn_pmksa_cache_entry *
wpa_auth_sta_get_pmksa(struct wpa_state_machine * sm)3027 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3028 {
3029 return sm ? sm->pmksa : NULL;
3030 }
3031
3032
wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine * sm)3033 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3034 {
3035 if (sm)
3036 sm->dot11RSNAStatsTKIPLocalMICFailures++;
3037 }
3038
3039
wpa_auth_get_wpa_ie(struct wpa_authenticator * wpa_auth,size_t * len)3040 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3041 {
3042 if (wpa_auth == NULL)
3043 return NULL;
3044 *len = wpa_auth->wpa_ie_len;
3045 return wpa_auth->wpa_ie;
3046 }
3047
3048
wpa_auth_pmksa_add(struct wpa_state_machine * sm,const u8 * pmk,int session_timeout,struct eapol_state_machine * eapol)3049 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3050 int session_timeout, struct eapol_state_machine *eapol)
3051 {
3052 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3053 sm->wpa_auth->conf.disable_pmksa_caching)
3054 return -1;
3055
3056 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
3057 sm->wpa_auth->addr, sm->addr, session_timeout,
3058 eapol, sm->wpa_key_mgmt))
3059 return 0;
3060
3061 return -1;
3062 }
3063
3064
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)3065 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3066 const u8 *pmk, size_t len, const u8 *sta_addr,
3067 int session_timeout,
3068 struct eapol_state_machine *eapol)
3069 {
3070 if (wpa_auth == NULL)
3071 return -1;
3072
3073 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
3074 sta_addr, session_timeout, eapol,
3075 WPA_KEY_MGMT_IEEE8021X))
3076 return 0;
3077
3078 return -1;
3079 }
3080
3081
wpa_auth_pmksa_remove(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)3082 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3083 const u8 *sta_addr)
3084 {
3085 struct rsn_pmksa_cache_entry *pmksa;
3086
3087 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3088 return;
3089 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3090 if (pmksa) {
3091 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3092 MACSTR " based on request", MAC2STR(sta_addr));
3093 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3094 }
3095 }
3096
3097
3098 static struct wpa_group *
wpa_auth_add_group(struct wpa_authenticator * wpa_auth,int vlan_id)3099 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3100 {
3101 struct wpa_group *group;
3102
3103 if (wpa_auth == NULL || wpa_auth->group == NULL)
3104 return NULL;
3105
3106 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
3107 vlan_id);
3108 group = wpa_group_init(wpa_auth, vlan_id, 0);
3109 if (group == NULL)
3110 return NULL;
3111
3112 group->next = wpa_auth->group->next;
3113 wpa_auth->group->next = group;
3114
3115 return group;
3116 }
3117
3118
wpa_auth_sta_set_vlan(struct wpa_state_machine * sm,int vlan_id)3119 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
3120 {
3121 struct wpa_group *group;
3122
3123 if (sm == NULL || sm->wpa_auth == NULL)
3124 return 0;
3125
3126 group = sm->wpa_auth->group;
3127 while (group) {
3128 if (group->vlan_id == vlan_id)
3129 break;
3130 group = group->next;
3131 }
3132
3133 if (group == NULL) {
3134 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
3135 if (group == NULL)
3136 return -1;
3137 }
3138
3139 if (sm->group == group)
3140 return 0;
3141
3142 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
3143 return -1;
3144
3145 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
3146 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
3147
3148 sm->group = group;
3149 return 0;
3150 }
3151
3152
wpa_auth_eapol_key_tx_status(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int ack)3153 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
3154 struct wpa_state_machine *sm, int ack)
3155 {
3156 if (wpa_auth == NULL || sm == NULL)
3157 return;
3158 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
3159 " ack=%d", MAC2STR(sm->addr), ack);
3160 if (sm->pending_1_of_4_timeout && ack) {
3161 /*
3162 * Some deployed supplicant implementations update their SNonce
3163 * for each EAPOL-Key 2/4 message even within the same 4-way
3164 * handshake and then fail to use the first SNonce when
3165 * deriving the PTK. This results in unsuccessful 4-way
3166 * handshake whenever the relatively short initial timeout is
3167 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3168 * around this by increasing the timeout now that we know that
3169 * the station has received the frame.
3170 */
3171 int timeout_ms = eapol_key_timeout_subseq;
3172 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3173 "timeout by %u ms because of acknowledged frame",
3174 timeout_ms);
3175 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3176 eloop_register_timeout(timeout_ms / 1000,
3177 (timeout_ms % 1000) * 1000,
3178 wpa_send_eapol_timeout, wpa_auth, sm);
3179 }
3180 }
3181
3182
wpa_auth_uses_sae(struct wpa_state_machine * sm)3183 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
3184 {
3185 if (sm == NULL)
3186 return 0;
3187 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
3188 }
3189
3190
wpa_auth_uses_ft_sae(struct wpa_state_machine * sm)3191 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
3192 {
3193 if (sm == NULL)
3194 return 0;
3195 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
3196 }
3197
3198
3199 #ifdef CONFIG_P2P
wpa_auth_get_ip_addr(struct wpa_state_machine * sm,u8 * addr)3200 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
3201 {
3202 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
3203 return -1;
3204 os_memcpy(addr, sm->ip_addr, 4);
3205 return 0;
3206 }
3207 #endif /* CONFIG_P2P */
3208