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, 16,
1394 (key_data_len - 8) / 8, buf,
1395 (u8 *) (key + 1))) {
1396 os_free(hdr);
1397 os_free(buf);
1398 return;
1399 }
1400 WPA_PUT_BE16(key->key_data_length, key_data_len);
1401 } else {
1402 u8 ek[32];
1403 os_memcpy(key->key_iv,
1404 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1405 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1406 os_memcpy(ek, key->key_iv, 16);
1407 os_memcpy(ek + 16, sm->PTK.kek, 16);
1408 os_memcpy(key + 1, buf, key_data_len);
1409 rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len);
1410 WPA_PUT_BE16(key->key_data_length, key_data_len);
1411 }
1412 os_free(buf);
1413 }
1414
1415 if (key_info & WPA_KEY_INFO_MIC) {
1416 if (!sm->PTK_valid) {
1417 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1418 "PTK not valid when sending EAPOL-Key "
1419 "frame");
1420 os_free(hdr);
1421 return;
1422 }
1423 wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len,
1424 key->key_mic);
1425 #ifdef CONFIG_TESTING_OPTIONS
1426 if (!pairwise &&
1427 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1428 drand48() <
1429 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1430 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1431 "Corrupting group EAPOL-Key Key MIC");
1432 key->key_mic[0]++;
1433 }
1434 #endif /* CONFIG_TESTING_OPTIONS */
1435 }
1436
1437 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1438 1);
1439 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1440 sm->pairwise_set);
1441 os_free(hdr);
1442 }
1443
1444
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)1445 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1446 struct wpa_state_machine *sm, int key_info,
1447 const u8 *key_rsc, const u8 *nonce,
1448 const u8 *kde, size_t kde_len,
1449 int keyidx, int encr)
1450 {
1451 int timeout_ms;
1452 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1453 int ctr;
1454
1455 if (sm == NULL)
1456 return;
1457
1458 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1459 keyidx, encr, 0);
1460
1461 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1462 if (ctr == 1 && wpa_auth->conf.tx_status)
1463 timeout_ms = pairwise ? eapol_key_timeout_first :
1464 eapol_key_timeout_first_group;
1465 else
1466 timeout_ms = eapol_key_timeout_subseq;
1467 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1468 sm->pending_1_of_4_timeout = 1;
1469 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1470 "counter %d)", timeout_ms, ctr);
1471 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1472 wpa_send_eapol_timeout, wpa_auth, sm);
1473 }
1474
1475
wpa_verify_key_mic(struct wpa_ptk * PTK,u8 * data,size_t data_len)1476 static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len)
1477 {
1478 struct ieee802_1x_hdr *hdr;
1479 struct wpa_eapol_key *key;
1480 u16 key_info;
1481 int ret = 0;
1482 u8 mic[16];
1483
1484 if (data_len < sizeof(*hdr) + sizeof(*key))
1485 return -1;
1486
1487 hdr = (struct ieee802_1x_hdr *) data;
1488 key = (struct wpa_eapol_key *) (hdr + 1);
1489 key_info = WPA_GET_BE16(key->key_info);
1490 os_memcpy(mic, key->key_mic, 16);
1491 os_memset(key->key_mic, 0, 16);
1492 if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK,
1493 data, data_len, key->key_mic) ||
1494 os_memcmp_const(mic, key->key_mic, 16) != 0)
1495 ret = -1;
1496 os_memcpy(key->key_mic, mic, 16);
1497 return ret;
1498 }
1499
1500
wpa_remove_ptk(struct wpa_state_machine * sm)1501 void wpa_remove_ptk(struct wpa_state_machine *sm)
1502 {
1503 sm->PTK_valid = FALSE;
1504 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1505 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1506 sm->pairwise_set = FALSE;
1507 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1508 }
1509
1510
wpa_auth_sm_event(struct wpa_state_machine * sm,wpa_event event)1511 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1512 {
1513 int remove_ptk = 1;
1514
1515 if (sm == NULL)
1516 return -1;
1517
1518 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1519 "event %d notification", event);
1520
1521 switch (event) {
1522 case WPA_AUTH:
1523 case WPA_ASSOC:
1524 break;
1525 case WPA_DEAUTH:
1526 case WPA_DISASSOC:
1527 sm->DeauthenticationRequest = TRUE;
1528 break;
1529 case WPA_REAUTH:
1530 case WPA_REAUTH_EAPOL:
1531 if (!sm->started) {
1532 /*
1533 * When using WPS, we may end up here if the STA
1534 * manages to re-associate without the previous STA
1535 * entry getting removed. Consequently, we need to make
1536 * sure that the WPA state machines gets initialized
1537 * properly at this point.
1538 */
1539 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1540 "started - initialize now");
1541 sm->started = 1;
1542 sm->Init = TRUE;
1543 if (wpa_sm_step(sm) == 1)
1544 return 1; /* should not really happen */
1545 sm->Init = FALSE;
1546 sm->AuthenticationRequest = TRUE;
1547 break;
1548 }
1549 if (sm->GUpdateStationKeys) {
1550 /*
1551 * Reauthentication cancels the pending group key
1552 * update for this STA.
1553 */
1554 sm->group->GKeyDoneStations--;
1555 sm->GUpdateStationKeys = FALSE;
1556 sm->PtkGroupInit = TRUE;
1557 }
1558 sm->ReAuthenticationRequest = TRUE;
1559 break;
1560 case WPA_ASSOC_FT:
1561 #ifdef CONFIG_IEEE80211R
1562 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1563 "after association");
1564 wpa_ft_install_ptk(sm);
1565
1566 /* Using FT protocol, not WPA auth state machine */
1567 sm->ft_completed = 1;
1568 return 0;
1569 #else /* CONFIG_IEEE80211R */
1570 break;
1571 #endif /* CONFIG_IEEE80211R */
1572 }
1573
1574 #ifdef CONFIG_IEEE80211R
1575 sm->ft_completed = 0;
1576 #endif /* CONFIG_IEEE80211R */
1577
1578 #ifdef CONFIG_IEEE80211W
1579 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1580 remove_ptk = 0;
1581 #endif /* CONFIG_IEEE80211W */
1582
1583 if (remove_ptk) {
1584 sm->PTK_valid = FALSE;
1585 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1586
1587 if (event != WPA_REAUTH_EAPOL)
1588 wpa_remove_ptk(sm);
1589 }
1590
1591 return wpa_sm_step(sm);
1592 }
1593
1594
SM_STATE(WPA_PTK,INITIALIZE)1595 SM_STATE(WPA_PTK, INITIALIZE)
1596 {
1597 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1598 if (sm->Init) {
1599 /* Init flag is not cleared here, so avoid busy
1600 * loop by claiming nothing changed. */
1601 sm->changed = FALSE;
1602 }
1603
1604 sm->keycount = 0;
1605 if (sm->GUpdateStationKeys)
1606 sm->group->GKeyDoneStations--;
1607 sm->GUpdateStationKeys = FALSE;
1608 if (sm->wpa == WPA_VERSION_WPA)
1609 sm->PInitAKeys = FALSE;
1610 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1611 * Local AA > Remote AA)) */) {
1612 sm->Pair = TRUE;
1613 }
1614 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1615 wpa_remove_ptk(sm);
1616 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1617 sm->TimeoutCtr = 0;
1618 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1619 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1620 WPA_EAPOL_authorized, 0);
1621 }
1622 }
1623
1624
SM_STATE(WPA_PTK,DISCONNECT)1625 SM_STATE(WPA_PTK, DISCONNECT)
1626 {
1627 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1628 sm->Disconnect = FALSE;
1629 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1630 }
1631
1632
SM_STATE(WPA_PTK,DISCONNECTED)1633 SM_STATE(WPA_PTK, DISCONNECTED)
1634 {
1635 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1636 sm->DeauthenticationRequest = FALSE;
1637 }
1638
1639
SM_STATE(WPA_PTK,AUTHENTICATION)1640 SM_STATE(WPA_PTK, AUTHENTICATION)
1641 {
1642 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1643 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1644 sm->PTK_valid = FALSE;
1645 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1646 1);
1647 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1648 sm->AuthenticationRequest = FALSE;
1649 }
1650
1651
wpa_group_ensure_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)1652 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1653 struct wpa_group *group)
1654 {
1655 if (group->first_sta_seen)
1656 return;
1657 /*
1658 * System has run bit further than at the time hostapd was started
1659 * potentially very early during boot up. This provides better chances
1660 * of collecting more randomness on embedded systems. Re-initialize the
1661 * GMK and Counter here to improve their strength if there was not
1662 * enough entropy available immediately after system startup.
1663 */
1664 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1665 "station");
1666 if (random_pool_ready() != 1) {
1667 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1668 "to proceed - reject first 4-way handshake");
1669 group->reject_4way_hs_for_entropy = TRUE;
1670 } else {
1671 group->first_sta_seen = TRUE;
1672 group->reject_4way_hs_for_entropy = FALSE;
1673 }
1674
1675 wpa_group_init_gmk_and_counter(wpa_auth, group);
1676 wpa_gtk_update(wpa_auth, group);
1677 wpa_group_config_group_keys(wpa_auth, group);
1678 }
1679
1680
SM_STATE(WPA_PTK,AUTHENTICATION2)1681 SM_STATE(WPA_PTK, AUTHENTICATION2)
1682 {
1683 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1684
1685 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1686 sm->ReAuthenticationRequest = FALSE;
1687
1688 /*
1689 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1690 * ambiguous. The Authenticator state machine uses a counter that is
1691 * incremented by one for each 4-way handshake. However, the security
1692 * analysis of 4-way handshake points out that unpredictable nonces
1693 * help in preventing precomputation attacks. Instead of the state
1694 * machine definition, use an unpredictable nonce value here to provide
1695 * stronger protection against potential precomputation attacks.
1696 */
1697 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1698 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1699 "ANonce.");
1700 sm->Disconnect = TRUE;
1701 return;
1702 }
1703 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1704 WPA_NONCE_LEN);
1705 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1706 * logical place than INITIALIZE since AUTHENTICATION2 can be
1707 * re-entered on ReAuthenticationRequest without going through
1708 * INITIALIZE. */
1709 sm->TimeoutCtr = 0;
1710 }
1711
1712
SM_STATE(WPA_PTK,INITPMK)1713 SM_STATE(WPA_PTK, INITPMK)
1714 {
1715 u8 msk[2 * PMK_LEN];
1716 size_t len = 2 * PMK_LEN;
1717
1718 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1719 #ifdef CONFIG_IEEE80211R
1720 sm->xxkey_len = 0;
1721 #endif /* CONFIG_IEEE80211R */
1722 if (sm->pmksa) {
1723 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1724 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1725 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1726 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1727 "(len=%lu)", (unsigned long) len);
1728 os_memcpy(sm->PMK, msk, PMK_LEN);
1729 #ifdef CONFIG_IEEE80211R
1730 if (len >= 2 * PMK_LEN) {
1731 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1732 sm->xxkey_len = PMK_LEN;
1733 }
1734 #endif /* CONFIG_IEEE80211R */
1735 } else {
1736 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK");
1737 }
1738
1739 sm->req_replay_counter_used = 0;
1740 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1741 * will break reauthentication since EAPOL state machines may not be
1742 * get into AUTHENTICATING state that clears keyRun before WPA state
1743 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1744 * state and takes PMK from the previously used AAA Key. This will
1745 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1746 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1747 * be good workaround for this issue. */
1748 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1749 }
1750
1751
SM_STATE(WPA_PTK,INITPSK)1752 SM_STATE(WPA_PTK, INITPSK)
1753 {
1754 const u8 *psk;
1755 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1756 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1757 if (psk) {
1758 os_memcpy(sm->PMK, psk, PMK_LEN);
1759 #ifdef CONFIG_IEEE80211R
1760 os_memcpy(sm->xxkey, psk, PMK_LEN);
1761 sm->xxkey_len = PMK_LEN;
1762 #endif /* CONFIG_IEEE80211R */
1763 }
1764 sm->req_replay_counter_used = 0;
1765 }
1766
1767
SM_STATE(WPA_PTK,PTKSTART)1768 SM_STATE(WPA_PTK, PTKSTART)
1769 {
1770 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1771 size_t pmkid_len = 0;
1772
1773 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1774 sm->PTKRequest = FALSE;
1775 sm->TimeoutEvt = FALSE;
1776
1777 sm->TimeoutCtr++;
1778 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1779 /* No point in sending the EAPOL-Key - we will disconnect
1780 * immediately following this. */
1781 return;
1782 }
1783
1784 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1785 "sending 1/4 msg of 4-Way Handshake");
1786 /*
1787 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1788 * one possible PSK for this STA.
1789 */
1790 if (sm->wpa == WPA_VERSION_WPA2 &&
1791 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
1792 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
1793 pmkid = buf;
1794 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1795 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1796 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1797 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1798 if (sm->pmksa)
1799 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1800 sm->pmksa->pmkid, PMKID_LEN);
1801 else {
1802 /*
1803 * Calculate PMKID since no PMKSA cache entry was
1804 * available with pre-calculated PMKID.
1805 */
1806 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1807 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1808 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1809 }
1810 }
1811 wpa_send_eapol(sm->wpa_auth, sm,
1812 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1813 sm->ANonce, pmkid, pmkid_len, 0, 0);
1814 }
1815
1816
wpa_derive_ptk(struct wpa_state_machine * sm,const u8 * pmk,struct wpa_ptk * ptk)1817 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk,
1818 struct wpa_ptk *ptk)
1819 {
1820 size_t ptk_len = wpa_cipher_key_len(sm->pairwise) + 32;
1821 #ifdef CONFIG_IEEE80211R
1822 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1823 return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len);
1824 #endif /* CONFIG_IEEE80211R */
1825
1826 wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
1827 sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce,
1828 (u8 *) ptk, ptk_len,
1829 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1830
1831 return 0;
1832 }
1833
1834
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING)1835 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
1836 {
1837 struct wpa_ptk PTK;
1838 int ok = 0;
1839 const u8 *pmk = NULL;
1840
1841 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
1842 sm->EAPOLKeyReceived = FALSE;
1843 sm->update_snonce = FALSE;
1844
1845 /* WPA with IEEE 802.1X: use the derived PMK from EAP
1846 * WPA-PSK: iterate through possible PSKs and select the one matching
1847 * the packet */
1848 for (;;) {
1849 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1850 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
1851 sm->p2p_dev_addr, pmk);
1852 if (pmk == NULL)
1853 break;
1854 } else
1855 pmk = sm->PMK;
1856
1857 wpa_derive_ptk(sm, pmk, &PTK);
1858
1859 if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key,
1860 sm->last_rx_eapol_key_len) == 0) {
1861 ok = 1;
1862 break;
1863 }
1864
1865 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
1866 break;
1867 }
1868
1869 if (!ok) {
1870 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1871 "invalid MIC in msg 2/4 of 4-Way Handshake");
1872 return;
1873 }
1874
1875 #ifdef CONFIG_IEEE80211R
1876 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
1877 /*
1878 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
1879 * with the value we derived.
1880 */
1881 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
1882 WPA_PMK_NAME_LEN) != 0) {
1883 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1884 "PMKR1Name mismatch in FT 4-way "
1885 "handshake");
1886 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
1887 "Supplicant",
1888 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
1889 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
1890 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
1891 return;
1892 }
1893 }
1894 #endif /* CONFIG_IEEE80211R */
1895
1896 sm->pending_1_of_4_timeout = 0;
1897 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
1898
1899 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1900 /* PSK may have changed from the previous choice, so update
1901 * state machine data based on whatever PSK was selected here.
1902 */
1903 os_memcpy(sm->PMK, pmk, PMK_LEN);
1904 }
1905
1906 sm->MICVerified = TRUE;
1907
1908 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
1909 sm->PTK_valid = TRUE;
1910 }
1911
1912
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING2)1913 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
1914 {
1915 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
1916 sm->TimeoutCtr = 0;
1917 }
1918
1919
1920 #ifdef CONFIG_IEEE80211W
1921
ieee80211w_kde_len(struct wpa_state_machine * sm)1922 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1923 {
1924 if (sm->mgmt_frame_prot) {
1925 size_t len;
1926 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
1927 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
1928 }
1929
1930 return 0;
1931 }
1932
1933
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)1934 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1935 {
1936 struct wpa_igtk_kde igtk;
1937 struct wpa_group *gsm = sm->group;
1938 u8 rsc[WPA_KEY_RSC_LEN];
1939 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
1940
1941 if (!sm->mgmt_frame_prot)
1942 return pos;
1943
1944 igtk.keyid[0] = gsm->GN_igtk;
1945 igtk.keyid[1] = 0;
1946 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
1947 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
1948 os_memset(igtk.pn, 0, sizeof(igtk.pn));
1949 else
1950 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
1951 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
1952 if (sm->wpa_auth->conf.disable_gtk) {
1953 /*
1954 * Provide unique random IGTK to each STA to prevent use of
1955 * IGTK in the BSS.
1956 */
1957 if (random_get_bytes(igtk.igtk, len) < 0)
1958 return pos;
1959 }
1960 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
1961 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
1962 NULL, 0);
1963
1964 return pos;
1965 }
1966
1967 #else /* CONFIG_IEEE80211W */
1968
ieee80211w_kde_len(struct wpa_state_machine * sm)1969 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
1970 {
1971 return 0;
1972 }
1973
1974
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)1975 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
1976 {
1977 return pos;
1978 }
1979
1980 #endif /* CONFIG_IEEE80211W */
1981
1982
SM_STATE(WPA_PTK,PTKINITNEGOTIATING)1983 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
1984 {
1985 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
1986 size_t gtk_len, kde_len;
1987 struct wpa_group *gsm = sm->group;
1988 u8 *wpa_ie;
1989 int wpa_ie_len, secure, keyidx, encr = 0;
1990
1991 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
1992 sm->TimeoutEvt = FALSE;
1993
1994 sm->TimeoutCtr++;
1995 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1996 /* No point in sending the EAPOL-Key - we will disconnect
1997 * immediately following this. */
1998 return;
1999 }
2000
2001 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
2002 GTK[GN], IGTK, [FTIE], [TIE * 2])
2003 */
2004 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2005 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2006 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
2007 wpa_ie = sm->wpa_auth->wpa_ie;
2008 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
2009 if (sm->wpa == WPA_VERSION_WPA &&
2010 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
2011 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
2012 /* WPA-only STA, remove RSN IE */
2013 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2014 wpa_ie_len = wpa_ie[1] + 2;
2015 }
2016 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2017 "sending 3/4 msg of 4-Way Handshake");
2018 if (sm->wpa == WPA_VERSION_WPA2) {
2019 /* WPA2 send GTK in the 4-way handshake */
2020 secure = 1;
2021 gtk = gsm->GTK[gsm->GN - 1];
2022 gtk_len = gsm->GTK_len;
2023 if (sm->wpa_auth->conf.disable_gtk) {
2024 /*
2025 * Provide unique random GTK to each STA to prevent use
2026 * of GTK in the BSS.
2027 */
2028 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2029 return;
2030 gtk = dummy_gtk;
2031 }
2032 keyidx = gsm->GN;
2033 _rsc = rsc;
2034 encr = 1;
2035 } else {
2036 /* WPA does not include GTK in msg 3/4 */
2037 secure = 0;
2038 gtk = NULL;
2039 gtk_len = 0;
2040 keyidx = 0;
2041 _rsc = NULL;
2042 if (sm->rx_eapol_key_secure) {
2043 /*
2044 * It looks like Windows 7 supplicant tries to use
2045 * Secure bit in msg 2/4 after having reported Michael
2046 * MIC failure and it then rejects the 4-way handshake
2047 * if msg 3/4 does not set Secure bit. Work around this
2048 * by setting the Secure bit here even in the case of
2049 * WPA if the supplicant used it first.
2050 */
2051 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2052 "STA used Secure bit in WPA msg 2/4 - "
2053 "set Secure for 3/4 as workaround");
2054 secure = 1;
2055 }
2056 }
2057
2058 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2059 if (gtk)
2060 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2061 #ifdef CONFIG_IEEE80211R
2062 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2063 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2064 kde_len += 300; /* FTIE + 2 * TIE */
2065 }
2066 #endif /* CONFIG_IEEE80211R */
2067 #ifdef CONFIG_P2P
2068 if (WPA_GET_BE32(sm->ip_addr) > 0)
2069 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2070 #endif /* CONFIG_P2P */
2071 kde = os_malloc(kde_len);
2072 if (kde == NULL)
2073 return;
2074
2075 pos = kde;
2076 os_memcpy(pos, wpa_ie, wpa_ie_len);
2077 pos += wpa_ie_len;
2078 #ifdef CONFIG_IEEE80211R
2079 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2080 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
2081 if (res < 0) {
2082 wpa_printf(MSG_ERROR, "FT: Failed to insert "
2083 "PMKR1Name into RSN IE in EAPOL-Key data");
2084 os_free(kde);
2085 return;
2086 }
2087 pos += res;
2088 }
2089 #endif /* CONFIG_IEEE80211R */
2090 if (gtk) {
2091 u8 hdr[2];
2092 hdr[0] = keyidx & 0x03;
2093 hdr[1] = 0;
2094 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2095 gtk, gtk_len);
2096 }
2097 pos = ieee80211w_kde_add(sm, pos);
2098
2099 #ifdef CONFIG_IEEE80211R
2100 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2101 int res;
2102 struct wpa_auth_config *conf;
2103
2104 conf = &sm->wpa_auth->conf;
2105 res = wpa_write_ftie(conf, conf->r0_key_holder,
2106 conf->r0_key_holder_len,
2107 NULL, NULL, pos, kde + kde_len - pos,
2108 NULL, 0);
2109 if (res < 0) {
2110 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2111 "into EAPOL-Key Key Data");
2112 os_free(kde);
2113 return;
2114 }
2115 pos += res;
2116
2117 /* TIE[ReassociationDeadline] (TU) */
2118 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2119 *pos++ = 5;
2120 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2121 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2122 pos += 4;
2123
2124 /* TIE[KeyLifetime] (seconds) */
2125 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2126 *pos++ = 5;
2127 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2128 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2129 pos += 4;
2130 }
2131 #endif /* CONFIG_IEEE80211R */
2132 #ifdef CONFIG_P2P
2133 if (WPA_GET_BE32(sm->ip_addr) > 0) {
2134 u8 addr[3 * 4];
2135 os_memcpy(addr, sm->ip_addr, 4);
2136 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2137 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2138 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2139 addr, sizeof(addr), NULL, 0);
2140 }
2141 #endif /* CONFIG_P2P */
2142
2143 wpa_send_eapol(sm->wpa_auth, sm,
2144 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2145 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2146 WPA_KEY_INFO_KEY_TYPE,
2147 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2148 os_free(kde);
2149 }
2150
2151
SM_STATE(WPA_PTK,PTKINITDONE)2152 SM_STATE(WPA_PTK, PTKINITDONE)
2153 {
2154 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2155 sm->EAPOLKeyReceived = FALSE;
2156 if (sm->Pair) {
2157 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2158 int klen = wpa_cipher_key_len(sm->pairwise);
2159 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2160 sm->PTK.tk1, klen)) {
2161 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2162 return;
2163 }
2164 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2165 sm->pairwise_set = TRUE;
2166
2167 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2168 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2169 eloop_register_timeout(sm->wpa_auth->conf.
2170 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2171 sm->wpa_auth, sm);
2172 }
2173
2174 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2175 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2176 WPA_EAPOL_authorized, 1);
2177 }
2178 }
2179
2180 if (0 /* IBSS == TRUE */) {
2181 sm->keycount++;
2182 if (sm->keycount == 2) {
2183 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2184 WPA_EAPOL_portValid, 1);
2185 }
2186 } else {
2187 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2188 1);
2189 }
2190 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2191 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2192 if (sm->wpa == WPA_VERSION_WPA)
2193 sm->PInitAKeys = TRUE;
2194 else
2195 sm->has_GTK = TRUE;
2196 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2197 "pairwise key handshake completed (%s)",
2198 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2199
2200 #ifdef CONFIG_IEEE80211R
2201 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2202 #endif /* CONFIG_IEEE80211R */
2203 }
2204
2205
SM_STEP(WPA_PTK)2206 SM_STEP(WPA_PTK)
2207 {
2208 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2209
2210 if (sm->Init)
2211 SM_ENTER(WPA_PTK, INITIALIZE);
2212 else if (sm->Disconnect
2213 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2214 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2215 "WPA_PTK: sm->Disconnect");
2216 SM_ENTER(WPA_PTK, DISCONNECT);
2217 }
2218 else if (sm->DeauthenticationRequest)
2219 SM_ENTER(WPA_PTK, DISCONNECTED);
2220 else if (sm->AuthenticationRequest)
2221 SM_ENTER(WPA_PTK, AUTHENTICATION);
2222 else if (sm->ReAuthenticationRequest)
2223 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2224 else if (sm->PTKRequest)
2225 SM_ENTER(WPA_PTK, PTKSTART);
2226 else switch (sm->wpa_ptk_state) {
2227 case WPA_PTK_INITIALIZE:
2228 break;
2229 case WPA_PTK_DISCONNECT:
2230 SM_ENTER(WPA_PTK, DISCONNECTED);
2231 break;
2232 case WPA_PTK_DISCONNECTED:
2233 SM_ENTER(WPA_PTK, INITIALIZE);
2234 break;
2235 case WPA_PTK_AUTHENTICATION:
2236 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2237 break;
2238 case WPA_PTK_AUTHENTICATION2:
2239 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2240 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2241 WPA_EAPOL_keyRun) > 0)
2242 SM_ENTER(WPA_PTK, INITPMK);
2243 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2244 /* FIX: && 802.1X::keyRun */)
2245 SM_ENTER(WPA_PTK, INITPSK);
2246 break;
2247 case WPA_PTK_INITPMK:
2248 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2249 WPA_EAPOL_keyAvailable) > 0)
2250 SM_ENTER(WPA_PTK, PTKSTART);
2251 else {
2252 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2253 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2254 "INITPMK - keyAvailable = false");
2255 SM_ENTER(WPA_PTK, DISCONNECT);
2256 }
2257 break;
2258 case WPA_PTK_INITPSK:
2259 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2260 NULL))
2261 SM_ENTER(WPA_PTK, PTKSTART);
2262 else {
2263 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2264 "no PSK configured for the STA");
2265 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2266 SM_ENTER(WPA_PTK, DISCONNECT);
2267 }
2268 break;
2269 case WPA_PTK_PTKSTART:
2270 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2271 sm->EAPOLKeyPairwise)
2272 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2273 else if (sm->TimeoutCtr >
2274 (int) dot11RSNAConfigPairwiseUpdateCount) {
2275 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2276 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2277 "PTKSTART: Retry limit %d reached",
2278 dot11RSNAConfigPairwiseUpdateCount);
2279 SM_ENTER(WPA_PTK, DISCONNECT);
2280 } else if (sm->TimeoutEvt)
2281 SM_ENTER(WPA_PTK, PTKSTART);
2282 break;
2283 case WPA_PTK_PTKCALCNEGOTIATING:
2284 if (sm->MICVerified)
2285 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2286 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2287 sm->EAPOLKeyPairwise)
2288 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2289 else if (sm->TimeoutEvt)
2290 SM_ENTER(WPA_PTK, PTKSTART);
2291 break;
2292 case WPA_PTK_PTKCALCNEGOTIATING2:
2293 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2294 break;
2295 case WPA_PTK_PTKINITNEGOTIATING:
2296 if (sm->update_snonce)
2297 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2298 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2299 sm->EAPOLKeyPairwise && sm->MICVerified)
2300 SM_ENTER(WPA_PTK, PTKINITDONE);
2301 else if (sm->TimeoutCtr >
2302 (int) dot11RSNAConfigPairwiseUpdateCount) {
2303 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2304 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2305 "PTKINITNEGOTIATING: Retry limit %d "
2306 "reached",
2307 dot11RSNAConfigPairwiseUpdateCount);
2308 SM_ENTER(WPA_PTK, DISCONNECT);
2309 } else if (sm->TimeoutEvt)
2310 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2311 break;
2312 case WPA_PTK_PTKINITDONE:
2313 break;
2314 }
2315 }
2316
2317
SM_STATE(WPA_PTK_GROUP,IDLE)2318 SM_STATE(WPA_PTK_GROUP, IDLE)
2319 {
2320 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2321 if (sm->Init) {
2322 /* Init flag is not cleared here, so avoid busy
2323 * loop by claiming nothing changed. */
2324 sm->changed = FALSE;
2325 }
2326 sm->GTimeoutCtr = 0;
2327 }
2328
2329
SM_STATE(WPA_PTK_GROUP,REKEYNEGOTIATING)2330 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2331 {
2332 u8 rsc[WPA_KEY_RSC_LEN];
2333 struct wpa_group *gsm = sm->group;
2334 u8 *kde, *pos, hdr[2];
2335 size_t kde_len;
2336 u8 *gtk, dummy_gtk[32];
2337
2338 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2339
2340 sm->GTimeoutCtr++;
2341 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2342 /* No point in sending the EAPOL-Key - we will disconnect
2343 * immediately following this. */
2344 return;
2345 }
2346
2347 if (sm->wpa == WPA_VERSION_WPA)
2348 sm->PInitAKeys = FALSE;
2349 sm->TimeoutEvt = FALSE;
2350 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2351 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2352 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2353 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2354 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2355 "sending 1/2 msg of Group Key Handshake");
2356
2357 gtk = gsm->GTK[gsm->GN - 1];
2358 if (sm->wpa_auth->conf.disable_gtk) {
2359 /*
2360 * Provide unique random GTK to each STA to prevent use
2361 * of GTK in the BSS.
2362 */
2363 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2364 return;
2365 gtk = dummy_gtk;
2366 }
2367 if (sm->wpa == WPA_VERSION_WPA2) {
2368 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2369 ieee80211w_kde_len(sm);
2370 kde = os_malloc(kde_len);
2371 if (kde == NULL)
2372 return;
2373
2374 pos = kde;
2375 hdr[0] = gsm->GN & 0x03;
2376 hdr[1] = 0;
2377 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2378 gtk, gsm->GTK_len);
2379 pos = ieee80211w_kde_add(sm, pos);
2380 } else {
2381 kde = gtk;
2382 pos = kde + gsm->GTK_len;
2383 }
2384
2385 wpa_send_eapol(sm->wpa_auth, sm,
2386 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2387 WPA_KEY_INFO_ACK |
2388 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2389 rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1);
2390 if (sm->wpa == WPA_VERSION_WPA2)
2391 os_free(kde);
2392 }
2393
2394
SM_STATE(WPA_PTK_GROUP,REKEYESTABLISHED)2395 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2396 {
2397 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2398 sm->EAPOLKeyReceived = FALSE;
2399 if (sm->GUpdateStationKeys)
2400 sm->group->GKeyDoneStations--;
2401 sm->GUpdateStationKeys = FALSE;
2402 sm->GTimeoutCtr = 0;
2403 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2404 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2405 "group key handshake completed (%s)",
2406 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2407 sm->has_GTK = TRUE;
2408 }
2409
2410
SM_STATE(WPA_PTK_GROUP,KEYERROR)2411 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2412 {
2413 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2414 if (sm->GUpdateStationKeys)
2415 sm->group->GKeyDoneStations--;
2416 sm->GUpdateStationKeys = FALSE;
2417 sm->Disconnect = TRUE;
2418 }
2419
2420
SM_STEP(WPA_PTK_GROUP)2421 SM_STEP(WPA_PTK_GROUP)
2422 {
2423 if (sm->Init || sm->PtkGroupInit) {
2424 SM_ENTER(WPA_PTK_GROUP, IDLE);
2425 sm->PtkGroupInit = FALSE;
2426 } else switch (sm->wpa_ptk_group_state) {
2427 case WPA_PTK_GROUP_IDLE:
2428 if (sm->GUpdateStationKeys ||
2429 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2430 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2431 break;
2432 case WPA_PTK_GROUP_REKEYNEGOTIATING:
2433 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2434 !sm->EAPOLKeyPairwise && sm->MICVerified)
2435 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2436 else if (sm->GTimeoutCtr >
2437 (int) dot11RSNAConfigGroupUpdateCount)
2438 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2439 else if (sm->TimeoutEvt)
2440 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2441 break;
2442 case WPA_PTK_GROUP_KEYERROR:
2443 SM_ENTER(WPA_PTK_GROUP, IDLE);
2444 break;
2445 case WPA_PTK_GROUP_REKEYESTABLISHED:
2446 SM_ENTER(WPA_PTK_GROUP, IDLE);
2447 break;
2448 }
2449 }
2450
2451
wpa_gtk_update(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2452 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2453 struct wpa_group *group)
2454 {
2455 int ret = 0;
2456
2457 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2458 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2459 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2460 wpa_auth->addr, group->GNonce,
2461 group->GTK[group->GN - 1], group->GTK_len) < 0)
2462 ret = -1;
2463 wpa_hexdump_key(MSG_DEBUG, "GTK",
2464 group->GTK[group->GN - 1], group->GTK_len);
2465
2466 #ifdef CONFIG_IEEE80211W
2467 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2468 size_t len;
2469 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2470 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2471 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2472 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2473 wpa_auth->addr, group->GNonce,
2474 group->IGTK[group->GN_igtk - 4], len) < 0)
2475 ret = -1;
2476 wpa_hexdump_key(MSG_DEBUG, "IGTK",
2477 group->IGTK[group->GN_igtk - 4], len);
2478 }
2479 #endif /* CONFIG_IEEE80211W */
2480
2481 return ret;
2482 }
2483
2484
wpa_group_gtk_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2485 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2486 struct wpa_group *group)
2487 {
2488 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2489 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2490 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2491 group->wpa_group_state = WPA_GROUP_GTK_INIT;
2492
2493 /* GTK[0..N] = 0 */
2494 os_memset(group->GTK, 0, sizeof(group->GTK));
2495 group->GN = 1;
2496 group->GM = 2;
2497 #ifdef CONFIG_IEEE80211W
2498 group->GN_igtk = 4;
2499 group->GM_igtk = 5;
2500 #endif /* CONFIG_IEEE80211W */
2501 /* GTK[GN] = CalcGTK() */
2502 wpa_gtk_update(wpa_auth, group);
2503 }
2504
2505
wpa_group_update_sta(struct wpa_state_machine * sm,void * ctx)2506 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2507 {
2508 if (ctx != NULL && ctx != sm->group)
2509 return 0;
2510
2511 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2512 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2513 "Not in PTKINITDONE; skip Group Key update");
2514 sm->GUpdateStationKeys = FALSE;
2515 return 0;
2516 }
2517 if (sm->GUpdateStationKeys) {
2518 /*
2519 * This should not really happen, so add a debug log entry.
2520 * Since we clear the GKeyDoneStations before the loop, the
2521 * station needs to be counted here anyway.
2522 */
2523 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2524 "GUpdateStationKeys was already set when "
2525 "marking station for GTK rekeying");
2526 }
2527
2528 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
2529 if (sm->is_wnmsleep)
2530 return 0;
2531
2532 sm->group->GKeyDoneStations++;
2533 sm->GUpdateStationKeys = TRUE;
2534
2535 wpa_sm_step(sm);
2536 return 0;
2537 }
2538
2539
2540 #ifdef CONFIG_WNM
2541 /* update GTK when exiting WNM-Sleep Mode */
wpa_wnmsleep_rekey_gtk(struct wpa_state_machine * sm)2542 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2543 {
2544 if (sm == NULL || sm->is_wnmsleep)
2545 return;
2546
2547 wpa_group_update_sta(sm, NULL);
2548 }
2549
2550
wpa_set_wnmsleep(struct wpa_state_machine * sm,int flag)2551 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2552 {
2553 if (sm)
2554 sm->is_wnmsleep = !!flag;
2555 }
2556
2557
wpa_wnmsleep_gtk_subelem(struct wpa_state_machine * sm,u8 * pos)2558 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2559 {
2560 struct wpa_group *gsm = sm->group;
2561 u8 *start = pos;
2562
2563 /*
2564 * GTK subelement:
2565 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2566 * Key[5..32]
2567 */
2568 *pos++ = WNM_SLEEP_SUBELEM_GTK;
2569 *pos++ = 11 + gsm->GTK_len;
2570 /* Key ID in B0-B1 of Key Info */
2571 WPA_PUT_LE16(pos, gsm->GN & 0x03);
2572 pos += 2;
2573 *pos++ = gsm->GTK_len;
2574 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
2575 return 0;
2576 pos += 8;
2577 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2578 pos += gsm->GTK_len;
2579
2580 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
2581 gsm->GN);
2582 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
2583 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2584
2585 return pos - start;
2586 }
2587
2588
2589 #ifdef CONFIG_IEEE80211W
wpa_wnmsleep_igtk_subelem(struct wpa_state_machine * sm,u8 * pos)2590 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2591 {
2592 struct wpa_group *gsm = sm->group;
2593 u8 *start = pos;
2594 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2595
2596 /*
2597 * IGTK subelement:
2598 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
2599 */
2600 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
2601 *pos++ = 2 + 6 + len;
2602 WPA_PUT_LE16(pos, gsm->GN_igtk);
2603 pos += 2;
2604 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
2605 return 0;
2606 pos += 6;
2607
2608 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
2609 pos += len;
2610
2611 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
2612 gsm->GN_igtk);
2613 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
2614 gsm->IGTK[gsm->GN_igtk - 4], len);
2615
2616 return pos - start;
2617 }
2618 #endif /* CONFIG_IEEE80211W */
2619 #endif /* CONFIG_WNM */
2620
2621
wpa_group_setkeys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2622 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2623 struct wpa_group *group)
2624 {
2625 int tmp;
2626
2627 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2628 "SETKEYS (VLAN-ID %d)", group->vlan_id);
2629 group->changed = TRUE;
2630 group->wpa_group_state = WPA_GROUP_SETKEYS;
2631 group->GTKReKey = FALSE;
2632 tmp = group->GM;
2633 group->GM = group->GN;
2634 group->GN = tmp;
2635 #ifdef CONFIG_IEEE80211W
2636 tmp = group->GM_igtk;
2637 group->GM_igtk = group->GN_igtk;
2638 group->GN_igtk = tmp;
2639 #endif /* CONFIG_IEEE80211W */
2640 /* "GKeyDoneStations = GNoStations" is done in more robust way by
2641 * counting the STAs that are marked with GUpdateStationKeys instead of
2642 * including all STAs that could be in not-yet-completed state. */
2643 wpa_gtk_update(wpa_auth, group);
2644
2645 if (group->GKeyDoneStations) {
2646 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2647 "GKeyDoneStations=%d when starting new GTK rekey",
2648 group->GKeyDoneStations);
2649 group->GKeyDoneStations = 0;
2650 }
2651 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
2652 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2653 group->GKeyDoneStations);
2654 }
2655
2656
wpa_group_config_group_keys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2657 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2658 struct wpa_group *group)
2659 {
2660 int ret = 0;
2661
2662 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2663 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
2664 broadcast_ether_addr, group->GN,
2665 group->GTK[group->GN - 1], group->GTK_len) < 0)
2666 ret = -1;
2667
2668 #ifdef CONFIG_IEEE80211W
2669 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2670 enum wpa_alg alg;
2671 size_t len;
2672
2673 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
2674 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2675
2676 if (ret == 0 &&
2677 wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
2678 broadcast_ether_addr, group->GN_igtk,
2679 group->IGTK[group->GN_igtk - 4], len) < 0)
2680 ret = -1;
2681 }
2682 #endif /* CONFIG_IEEE80211W */
2683
2684 return ret;
2685 }
2686
2687
wpa_group_disconnect_cb(struct wpa_state_machine * sm,void * ctx)2688 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
2689 {
2690 if (sm->group == ctx) {
2691 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
2692 " for discconnection due to fatal failure",
2693 MAC2STR(sm->addr));
2694 sm->Disconnect = TRUE;
2695 }
2696
2697 return 0;
2698 }
2699
2700
wpa_group_fatal_failure(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2701 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
2702 struct wpa_group *group)
2703 {
2704 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
2705 group->changed = TRUE;
2706 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
2707 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
2708 }
2709
2710
wpa_group_setkeysdone(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2711 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2712 struct wpa_group *group)
2713 {
2714 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2715 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2716 group->changed = TRUE;
2717 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2718
2719 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
2720 wpa_group_fatal_failure(wpa_auth, group);
2721 return -1;
2722 }
2723
2724 return 0;
2725 }
2726
2727
wpa_group_sm_step(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2728 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2729 struct wpa_group *group)
2730 {
2731 if (group->GInit) {
2732 wpa_group_gtk_init(wpa_auth, group);
2733 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
2734 /* Do not allow group operations */
2735 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2736 group->GTKAuthenticator) {
2737 wpa_group_setkeysdone(wpa_auth, group);
2738 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2739 group->GTKReKey) {
2740 wpa_group_setkeys(wpa_auth, group);
2741 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2742 if (group->GKeyDoneStations == 0)
2743 wpa_group_setkeysdone(wpa_auth, group);
2744 else if (group->GTKReKey)
2745 wpa_group_setkeys(wpa_auth, group);
2746 }
2747 }
2748
2749
wpa_sm_step(struct wpa_state_machine * sm)2750 static int wpa_sm_step(struct wpa_state_machine *sm)
2751 {
2752 if (sm == NULL)
2753 return 0;
2754
2755 if (sm->in_step_loop) {
2756 /* This should not happen, but if it does, make sure we do not
2757 * end up freeing the state machine too early by exiting the
2758 * recursive call. */
2759 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2760 return 0;
2761 }
2762
2763 sm->in_step_loop = 1;
2764 do {
2765 if (sm->pending_deinit)
2766 break;
2767
2768 sm->changed = FALSE;
2769 sm->wpa_auth->group->changed = FALSE;
2770
2771 SM_STEP_RUN(WPA_PTK);
2772 if (sm->pending_deinit)
2773 break;
2774 SM_STEP_RUN(WPA_PTK_GROUP);
2775 if (sm->pending_deinit)
2776 break;
2777 wpa_group_sm_step(sm->wpa_auth, sm->group);
2778 } while (sm->changed || sm->wpa_auth->group->changed);
2779 sm->in_step_loop = 0;
2780
2781 if (sm->pending_deinit) {
2782 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2783 "machine deinit for " MACSTR, MAC2STR(sm->addr));
2784 wpa_free_sta_sm(sm);
2785 return 1;
2786 }
2787 return 0;
2788 }
2789
2790
wpa_sm_call_step(void * eloop_ctx,void * timeout_ctx)2791 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2792 {
2793 struct wpa_state_machine *sm = eloop_ctx;
2794 wpa_sm_step(sm);
2795 }
2796
2797
wpa_auth_sm_notify(struct wpa_state_machine * sm)2798 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2799 {
2800 if (sm == NULL)
2801 return;
2802 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2803 }
2804
2805
wpa_gtk_rekey(struct wpa_authenticator * wpa_auth)2806 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2807 {
2808 int tmp, i;
2809 struct wpa_group *group;
2810
2811 if (wpa_auth == NULL)
2812 return;
2813
2814 group = wpa_auth->group;
2815
2816 for (i = 0; i < 2; i++) {
2817 tmp = group->GM;
2818 group->GM = group->GN;
2819 group->GN = tmp;
2820 #ifdef CONFIG_IEEE80211W
2821 tmp = group->GM_igtk;
2822 group->GM_igtk = group->GN_igtk;
2823 group->GN_igtk = tmp;
2824 #endif /* CONFIG_IEEE80211W */
2825 wpa_gtk_update(wpa_auth, group);
2826 wpa_group_config_group_keys(wpa_auth, group);
2827 }
2828 }
2829
2830
wpa_bool_txt(int bool)2831 static const char * wpa_bool_txt(int bool)
2832 {
2833 return bool ? "TRUE" : "FALSE";
2834 }
2835
2836
2837 #define RSN_SUITE "%02x-%02x-%02x-%d"
2838 #define RSN_SUITE_ARG(s) \
2839 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
2840
wpa_get_mib(struct wpa_authenticator * wpa_auth,char * buf,size_t buflen)2841 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
2842 {
2843 int len = 0, ret;
2844 char pmkid_txt[PMKID_LEN * 2 + 1];
2845 #ifdef CONFIG_RSN_PREAUTH
2846 const int preauth = 1;
2847 #else /* CONFIG_RSN_PREAUTH */
2848 const int preauth = 0;
2849 #endif /* CONFIG_RSN_PREAUTH */
2850
2851 if (wpa_auth == NULL)
2852 return len;
2853
2854 ret = os_snprintf(buf + len, buflen - len,
2855 "dot11RSNAOptionImplemented=TRUE\n"
2856 "dot11RSNAPreauthenticationImplemented=%s\n"
2857 "dot11RSNAEnabled=%s\n"
2858 "dot11RSNAPreauthenticationEnabled=%s\n",
2859 wpa_bool_txt(preauth),
2860 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
2861 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
2862 if (ret < 0 || (size_t) ret >= buflen - len)
2863 return len;
2864 len += ret;
2865
2866 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
2867 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
2868
2869 ret = os_snprintf(
2870 buf + len, buflen - len,
2871 "dot11RSNAConfigVersion=%u\n"
2872 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
2873 /* FIX: dot11RSNAConfigGroupCipher */
2874 /* FIX: dot11RSNAConfigGroupRekeyMethod */
2875 /* FIX: dot11RSNAConfigGroupRekeyTime */
2876 /* FIX: dot11RSNAConfigGroupRekeyPackets */
2877 "dot11RSNAConfigGroupRekeyStrict=%u\n"
2878 "dot11RSNAConfigGroupUpdateCount=%u\n"
2879 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
2880 "dot11RSNAConfigGroupCipherSize=%u\n"
2881 "dot11RSNAConfigPMKLifetime=%u\n"
2882 "dot11RSNAConfigPMKReauthThreshold=%u\n"
2883 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
2884 "dot11RSNAConfigSATimeout=%u\n"
2885 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
2886 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
2887 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
2888 "dot11RSNAPMKIDUsed=%s\n"
2889 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
2890 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
2891 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
2892 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
2893 "dot11RSNA4WayHandshakeFailures=%u\n"
2894 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
2895 RSN_VERSION,
2896 !!wpa_auth->conf.wpa_strict_rekey,
2897 dot11RSNAConfigGroupUpdateCount,
2898 dot11RSNAConfigPairwiseUpdateCount,
2899 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
2900 dot11RSNAConfigPMKLifetime,
2901 dot11RSNAConfigPMKReauthThreshold,
2902 dot11RSNAConfigSATimeout,
2903 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
2904 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
2905 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
2906 pmkid_txt,
2907 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
2908 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
2909 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
2910 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
2911 wpa_auth->dot11RSNA4WayHandshakeFailures);
2912 if (ret < 0 || (size_t) ret >= buflen - len)
2913 return len;
2914 len += ret;
2915
2916 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
2917 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
2918
2919 /* Private MIB */
2920 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
2921 wpa_auth->group->wpa_group_state);
2922 if (ret < 0 || (size_t) ret >= buflen - len)
2923 return len;
2924 len += ret;
2925
2926 return len;
2927 }
2928
2929
wpa_get_mib_sta(struct wpa_state_machine * sm,char * buf,size_t buflen)2930 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
2931 {
2932 int len = 0, ret;
2933 u32 pairwise = 0;
2934
2935 if (sm == NULL)
2936 return 0;
2937
2938 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
2939
2940 /* dot11RSNAStatsEntry */
2941
2942 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
2943 WPA_PROTO_RSN : WPA_PROTO_WPA,
2944 sm->pairwise);
2945 if (pairwise == 0)
2946 return 0;
2947
2948 ret = os_snprintf(
2949 buf + len, buflen - len,
2950 /* TODO: dot11RSNAStatsIndex */
2951 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
2952 "dot11RSNAStatsVersion=1\n"
2953 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
2954 /* TODO: dot11RSNAStatsTKIPICVErrors */
2955 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
2956 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
2957 /* TODO: dot11RSNAStatsCCMPReplays */
2958 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
2959 /* TODO: dot11RSNAStatsTKIPReplays */,
2960 MAC2STR(sm->addr),
2961 RSN_SUITE_ARG(pairwise),
2962 sm->dot11RSNAStatsTKIPLocalMICFailures,
2963 sm->dot11RSNAStatsTKIPRemoteMICFailures);
2964 if (ret < 0 || (size_t) ret >= buflen - len)
2965 return len;
2966 len += ret;
2967
2968 /* Private MIB */
2969 ret = os_snprintf(buf + len, buflen - len,
2970 "hostapdWPAPTKState=%d\n"
2971 "hostapdWPAPTKGroupState=%d\n",
2972 sm->wpa_ptk_state,
2973 sm->wpa_ptk_group_state);
2974 if (ret < 0 || (size_t) ret >= buflen - len)
2975 return len;
2976 len += ret;
2977
2978 return len;
2979 }
2980
2981
wpa_auth_countermeasures_start(struct wpa_authenticator * wpa_auth)2982 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
2983 {
2984 if (wpa_auth)
2985 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
2986 }
2987
2988
wpa_auth_pairwise_set(struct wpa_state_machine * sm)2989 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
2990 {
2991 return sm && sm->pairwise_set;
2992 }
2993
2994
wpa_auth_get_pairwise(struct wpa_state_machine * sm)2995 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
2996 {
2997 return sm->pairwise;
2998 }
2999
3000
wpa_auth_sta_key_mgmt(struct wpa_state_machine * sm)3001 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
3002 {
3003 if (sm == NULL)
3004 return -1;
3005 return sm->wpa_key_mgmt;
3006 }
3007
3008
wpa_auth_sta_wpa_version(struct wpa_state_machine * sm)3009 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
3010 {
3011 if (sm == NULL)
3012 return 0;
3013 return sm->wpa;
3014 }
3015
3016
wpa_auth_sta_clear_pmksa(struct wpa_state_machine * sm,struct rsn_pmksa_cache_entry * entry)3017 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
3018 struct rsn_pmksa_cache_entry *entry)
3019 {
3020 if (sm == NULL || sm->pmksa != entry)
3021 return -1;
3022 sm->pmksa = NULL;
3023 return 0;
3024 }
3025
3026
3027 struct rsn_pmksa_cache_entry *
wpa_auth_sta_get_pmksa(struct wpa_state_machine * sm)3028 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3029 {
3030 return sm ? sm->pmksa : NULL;
3031 }
3032
3033
wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine * sm)3034 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3035 {
3036 if (sm)
3037 sm->dot11RSNAStatsTKIPLocalMICFailures++;
3038 }
3039
3040
wpa_auth_get_wpa_ie(struct wpa_authenticator * wpa_auth,size_t * len)3041 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3042 {
3043 if (wpa_auth == NULL)
3044 return NULL;
3045 *len = wpa_auth->wpa_ie_len;
3046 return wpa_auth->wpa_ie;
3047 }
3048
3049
wpa_auth_pmksa_add(struct wpa_state_machine * sm,const u8 * pmk,int session_timeout,struct eapol_state_machine * eapol)3050 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3051 int session_timeout, struct eapol_state_machine *eapol)
3052 {
3053 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3054 sm->wpa_auth->conf.disable_pmksa_caching)
3055 return -1;
3056
3057 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
3058 sm->wpa_auth->addr, sm->addr, session_timeout,
3059 eapol, sm->wpa_key_mgmt))
3060 return 0;
3061
3062 return -1;
3063 }
3064
3065
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)3066 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3067 const u8 *pmk, size_t len, const u8 *sta_addr,
3068 int session_timeout,
3069 struct eapol_state_machine *eapol)
3070 {
3071 if (wpa_auth == NULL)
3072 return -1;
3073
3074 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr,
3075 sta_addr, session_timeout, eapol,
3076 WPA_KEY_MGMT_IEEE8021X))
3077 return 0;
3078
3079 return -1;
3080 }
3081
3082
wpa_auth_pmksa_remove(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)3083 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3084 const u8 *sta_addr)
3085 {
3086 struct rsn_pmksa_cache_entry *pmksa;
3087
3088 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3089 return;
3090 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3091 if (pmksa) {
3092 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3093 MACSTR " based on request", MAC2STR(sta_addr));
3094 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3095 }
3096 }
3097
3098
3099 static struct wpa_group *
wpa_auth_add_group(struct wpa_authenticator * wpa_auth,int vlan_id)3100 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3101 {
3102 struct wpa_group *group;
3103
3104 if (wpa_auth == NULL || wpa_auth->group == NULL)
3105 return NULL;
3106
3107 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
3108 vlan_id);
3109 group = wpa_group_init(wpa_auth, vlan_id, 0);
3110 if (group == NULL)
3111 return NULL;
3112
3113 group->next = wpa_auth->group->next;
3114 wpa_auth->group->next = group;
3115
3116 return group;
3117 }
3118
3119
wpa_auth_sta_set_vlan(struct wpa_state_machine * sm,int vlan_id)3120 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
3121 {
3122 struct wpa_group *group;
3123
3124 if (sm == NULL || sm->wpa_auth == NULL)
3125 return 0;
3126
3127 group = sm->wpa_auth->group;
3128 while (group) {
3129 if (group->vlan_id == vlan_id)
3130 break;
3131 group = group->next;
3132 }
3133
3134 if (group == NULL) {
3135 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
3136 if (group == NULL)
3137 return -1;
3138 }
3139
3140 if (sm->group == group)
3141 return 0;
3142
3143 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
3144 return -1;
3145
3146 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
3147 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
3148
3149 sm->group = group;
3150 return 0;
3151 }
3152
3153
wpa_auth_eapol_key_tx_status(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int ack)3154 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
3155 struct wpa_state_machine *sm, int ack)
3156 {
3157 if (wpa_auth == NULL || sm == NULL)
3158 return;
3159 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
3160 " ack=%d", MAC2STR(sm->addr), ack);
3161 if (sm->pending_1_of_4_timeout && ack) {
3162 /*
3163 * Some deployed supplicant implementations update their SNonce
3164 * for each EAPOL-Key 2/4 message even within the same 4-way
3165 * handshake and then fail to use the first SNonce when
3166 * deriving the PTK. This results in unsuccessful 4-way
3167 * handshake whenever the relatively short initial timeout is
3168 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3169 * around this by increasing the timeout now that we know that
3170 * the station has received the frame.
3171 */
3172 int timeout_ms = eapol_key_timeout_subseq;
3173 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3174 "timeout by %u ms because of acknowledged frame",
3175 timeout_ms);
3176 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3177 eloop_register_timeout(timeout_ms / 1000,
3178 (timeout_ms % 1000) * 1000,
3179 wpa_send_eapol_timeout, wpa_auth, sm);
3180 }
3181 }
3182
3183
wpa_auth_uses_sae(struct wpa_state_machine * sm)3184 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
3185 {
3186 if (sm == NULL)
3187 return 0;
3188 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
3189 }
3190
3191
wpa_auth_uses_ft_sae(struct wpa_state_machine * sm)3192 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
3193 {
3194 if (sm == NULL)
3195 return 0;
3196 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
3197 }
3198
3199
3200 #ifdef CONFIG_P2P
wpa_auth_get_ip_addr(struct wpa_state_machine * sm,u8 * addr)3201 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
3202 {
3203 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
3204 return -1;
3205 os_memcpy(addr, sm->ip_addr, 4);
3206 return 0;
3207 }
3208 #endif /* CONFIG_P2P */
3209