1 /*
2 * IEEE 802.11 RSN / WPA Authenticator
3 * Copyright (c) 2004-2015, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "utils/state_machine.h"
14 #include "utils/bitfield.h"
15 #include "common/ieee802_11_defs.h"
16 #include "crypto/aes_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(int akmp, struct wpa_ptk *PTK, u8 *data,
37 size_t data_len);
38 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
39 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
40 struct wpa_group *group);
41 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
42 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
43 struct wpa_group *group);
44 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
45 struct wpa_group *group);
46 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
47 const u8 *pmk, struct wpa_ptk *ptk);
48 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
49 struct wpa_group *group);
50 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
51 struct wpa_group *group);
52 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
53 struct wpa_group *group);
54
55 static const u32 dot11RSNAConfigGroupUpdateCount = 4;
56 static const u32 dot11RSNAConfigPairwiseUpdateCount = 4;
57 static const u32 eapol_key_timeout_first = 100; /* ms */
58 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
59 static const u32 eapol_key_timeout_first_group = 500; /* ms */
60
61 /* TODO: make these configurable */
62 static const int dot11RSNAConfigPMKLifetime = 43200;
63 static const int dot11RSNAConfigPMKReauthThreshold = 70;
64 static const int dot11RSNAConfigSATimeout = 60;
65
66
wpa_auth_mic_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)67 static inline int wpa_auth_mic_failure_report(
68 struct wpa_authenticator *wpa_auth, const u8 *addr)
69 {
70 if (wpa_auth->cb.mic_failure_report)
71 return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr);
72 return 0;
73 }
74
75
wpa_auth_psk_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)76 static inline void wpa_auth_psk_failure_report(
77 struct wpa_authenticator *wpa_auth, const u8 *addr)
78 {
79 if (wpa_auth->cb.psk_failure_report)
80 wpa_auth->cb.psk_failure_report(wpa_auth->cb.ctx, addr);
81 }
82
83
wpa_auth_set_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var,int value)84 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
85 const u8 *addr, wpa_eapol_variable var,
86 int value)
87 {
88 if (wpa_auth->cb.set_eapol)
89 wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value);
90 }
91
92
wpa_auth_get_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var)93 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
94 const u8 *addr, wpa_eapol_variable var)
95 {
96 if (wpa_auth->cb.get_eapol == NULL)
97 return -1;
98 return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var);
99 }
100
101
wpa_auth_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk)102 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
103 const u8 *addr,
104 const u8 *p2p_dev_addr,
105 const u8 *prev_psk)
106 {
107 if (wpa_auth->cb.get_psk == NULL)
108 return NULL;
109 return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, p2p_dev_addr,
110 prev_psk);
111 }
112
113
wpa_auth_get_msk(struct wpa_authenticator * wpa_auth,const u8 * addr,u8 * msk,size_t * len)114 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
115 const u8 *addr, u8 *msk, size_t *len)
116 {
117 if (wpa_auth->cb.get_msk == NULL)
118 return -1;
119 return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len);
120 }
121
122
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)123 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
124 int vlan_id,
125 enum wpa_alg alg, const u8 *addr, int idx,
126 u8 *key, size_t key_len)
127 {
128 if (wpa_auth->cb.set_key == NULL)
129 return -1;
130 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
131 key, key_len);
132 }
133
134
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)135 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
136 const u8 *addr, int idx, u8 *seq)
137 {
138 if (wpa_auth->cb.get_seqnum == NULL)
139 return -1;
140 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
141 }
142
143
144 static inline int
wpa_auth_send_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * data,size_t data_len,int encrypt)145 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
146 const u8 *data, size_t data_len, int encrypt)
147 {
148 if (wpa_auth->cb.send_eapol == NULL)
149 return -1;
150 return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len,
151 encrypt);
152 }
153
154
155 #ifdef CONFIG_MESH
wpa_auth_start_ampe(struct wpa_authenticator * wpa_auth,const u8 * addr)156 static inline int wpa_auth_start_ampe(struct wpa_authenticator *wpa_auth,
157 const u8 *addr)
158 {
159 if (wpa_auth->cb.start_ampe == NULL)
160 return -1;
161 return wpa_auth->cb.start_ampe(wpa_auth->cb.ctx, addr);
162 }
163 #endif /* CONFIG_MESH */
164
165
wpa_auth_for_each_sta(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)166 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
167 int (*cb)(struct wpa_state_machine *sm, void *ctx),
168 void *cb_ctx)
169 {
170 if (wpa_auth->cb.for_each_sta == NULL)
171 return 0;
172 return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx);
173 }
174
175
wpa_auth_for_each_auth(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_authenticator * a,void * ctx),void * cb_ctx)176 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
177 int (*cb)(struct wpa_authenticator *a, void *ctx),
178 void *cb_ctx)
179 {
180 if (wpa_auth->cb.for_each_auth == NULL)
181 return 0;
182 return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx);
183 }
184
185
wpa_auth_logger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * txt)186 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
187 logger_level level, const char *txt)
188 {
189 if (wpa_auth->cb.logger == NULL)
190 return;
191 wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt);
192 }
193
194
wpa_auth_vlogger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * fmt,...)195 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
196 logger_level level, const char *fmt, ...)
197 {
198 char *format;
199 int maxlen;
200 va_list ap;
201
202 if (wpa_auth->cb.logger == NULL)
203 return;
204
205 maxlen = os_strlen(fmt) + 100;
206 format = os_malloc(maxlen);
207 if (!format)
208 return;
209
210 va_start(ap, fmt);
211 vsnprintf(format, maxlen, fmt, ap);
212 va_end(ap);
213
214 wpa_auth_logger(wpa_auth, addr, level, format);
215
216 os_free(format);
217 }
218
219
wpa_sta_disconnect(struct wpa_authenticator * wpa_auth,const u8 * addr)220 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
221 const u8 *addr)
222 {
223 if (wpa_auth->cb.disconnect == NULL)
224 return;
225 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr));
226 wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr,
227 WLAN_REASON_PREV_AUTH_NOT_VALID);
228 }
229
230
wpa_use_aes_cmac(struct wpa_state_machine * sm)231 static int wpa_use_aes_cmac(struct wpa_state_machine *sm)
232 {
233 int ret = 0;
234 #ifdef CONFIG_IEEE80211R
235 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
236 ret = 1;
237 #endif /* CONFIG_IEEE80211R */
238 #ifdef CONFIG_IEEE80211W
239 if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt))
240 ret = 1;
241 #endif /* CONFIG_IEEE80211W */
242 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN)
243 ret = 1;
244 return ret;
245 }
246
247
wpa_rekey_gmk(void * eloop_ctx,void * timeout_ctx)248 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
249 {
250 struct wpa_authenticator *wpa_auth = eloop_ctx;
251
252 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
253 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
254 "initialization.");
255 } else {
256 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
257 wpa_hexdump_key(MSG_DEBUG, "GMK",
258 wpa_auth->group->GMK, WPA_GMK_LEN);
259 }
260
261 if (wpa_auth->conf.wpa_gmk_rekey) {
262 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
263 wpa_rekey_gmk, wpa_auth, NULL);
264 }
265 }
266
267
wpa_rekey_gtk(void * eloop_ctx,void * timeout_ctx)268 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
269 {
270 struct wpa_authenticator *wpa_auth = eloop_ctx;
271 struct wpa_group *group, *next;
272
273 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
274 group = wpa_auth->group;
275 while (group) {
276 wpa_group_get(wpa_auth, group);
277
278 group->GTKReKey = TRUE;
279 do {
280 group->changed = FALSE;
281 wpa_group_sm_step(wpa_auth, group);
282 } while (group->changed);
283
284 next = group->next;
285 wpa_group_put(wpa_auth, group);
286 group = next;
287 }
288
289 if (wpa_auth->conf.wpa_group_rekey) {
290 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
291 0, wpa_rekey_gtk, wpa_auth, NULL);
292 }
293 }
294
295
wpa_rekey_ptk(void * eloop_ctx,void * timeout_ctx)296 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
297 {
298 struct wpa_authenticator *wpa_auth = eloop_ctx;
299 struct wpa_state_machine *sm = timeout_ctx;
300
301 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
302 wpa_request_new_ptk(sm);
303 wpa_sm_step(sm);
304 }
305
306
wpa_auth_pmksa_clear_cb(struct wpa_state_machine * sm,void * ctx)307 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
308 {
309 if (sm->pmksa == ctx)
310 sm->pmksa = NULL;
311 return 0;
312 }
313
314
wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx)315 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
316 void *ctx)
317 {
318 struct wpa_authenticator *wpa_auth = ctx;
319 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
320 }
321
322
wpa_group_init_gmk_and_counter(struct wpa_authenticator * wpa_auth,struct wpa_group * group)323 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
324 struct wpa_group *group)
325 {
326 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
327 u8 rkey[32];
328 unsigned long ptr;
329
330 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
331 return -1;
332 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
333
334 /*
335 * Counter = PRF-256(Random number, "Init Counter",
336 * Local MAC Address || Time)
337 */
338 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
339 wpa_get_ntp_timestamp(buf + ETH_ALEN);
340 ptr = (unsigned long) group;
341 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
342 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
343 return -1;
344
345 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
346 group->Counter, WPA_NONCE_LEN) < 0)
347 return -1;
348 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
349 group->Counter, WPA_NONCE_LEN);
350
351 return 0;
352 }
353
354
wpa_group_init(struct wpa_authenticator * wpa_auth,int vlan_id,int delay_init)355 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
356 int vlan_id, int delay_init)
357 {
358 struct wpa_group *group;
359
360 group = os_zalloc(sizeof(struct wpa_group));
361 if (group == NULL)
362 return NULL;
363
364 group->GTKAuthenticator = TRUE;
365 group->vlan_id = vlan_id;
366 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
367
368 if (random_pool_ready() != 1) {
369 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
370 "for secure operations - update keys later when "
371 "the first station connects");
372 }
373
374 /*
375 * Set initial GMK/Counter value here. The actual values that will be
376 * used in negotiations will be set once the first station tries to
377 * connect. This allows more time for collecting additional randomness
378 * on embedded devices.
379 */
380 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
381 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
382 "initialization.");
383 os_free(group);
384 return NULL;
385 }
386
387 group->GInit = TRUE;
388 if (delay_init) {
389 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
390 "until Beacon frames have been configured");
391 /* Initialization is completed in wpa_init_keys(). */
392 } else {
393 wpa_group_sm_step(wpa_auth, group);
394 group->GInit = FALSE;
395 wpa_group_sm_step(wpa_auth, group);
396 }
397
398 return group;
399 }
400
401
402 /**
403 * wpa_init - Initialize WPA authenticator
404 * @addr: Authenticator address
405 * @conf: Configuration for WPA authenticator
406 * @cb: Callback functions for WPA authenticator
407 * Returns: Pointer to WPA authenticator data or %NULL on failure
408 */
wpa_init(const u8 * addr,struct wpa_auth_config * conf,struct wpa_auth_callbacks * cb)409 struct wpa_authenticator * wpa_init(const u8 *addr,
410 struct wpa_auth_config *conf,
411 struct wpa_auth_callbacks *cb)
412 {
413 struct wpa_authenticator *wpa_auth;
414
415 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
416 if (wpa_auth == NULL)
417 return NULL;
418 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
419 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
420 os_memcpy(&wpa_auth->cb, cb, sizeof(*cb));
421
422 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
423 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
424 os_free(wpa_auth);
425 return NULL;
426 }
427
428 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
429 if (wpa_auth->group == NULL) {
430 os_free(wpa_auth->wpa_ie);
431 os_free(wpa_auth);
432 return NULL;
433 }
434
435 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
436 wpa_auth);
437 if (wpa_auth->pmksa == NULL) {
438 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
439 os_free(wpa_auth->group);
440 os_free(wpa_auth->wpa_ie);
441 os_free(wpa_auth);
442 return NULL;
443 }
444
445 #ifdef CONFIG_IEEE80211R
446 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
447 if (wpa_auth->ft_pmk_cache == NULL) {
448 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
449 os_free(wpa_auth->group);
450 os_free(wpa_auth->wpa_ie);
451 pmksa_cache_auth_deinit(wpa_auth->pmksa);
452 os_free(wpa_auth);
453 return NULL;
454 }
455 #endif /* CONFIG_IEEE80211R */
456
457 if (wpa_auth->conf.wpa_gmk_rekey) {
458 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
459 wpa_rekey_gmk, wpa_auth, NULL);
460 }
461
462 if (wpa_auth->conf.wpa_group_rekey) {
463 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
464 wpa_rekey_gtk, wpa_auth, NULL);
465 }
466
467 #ifdef CONFIG_P2P
468 if (WPA_GET_BE32(conf->ip_addr_start)) {
469 int count = WPA_GET_BE32(conf->ip_addr_end) -
470 WPA_GET_BE32(conf->ip_addr_start) + 1;
471 if (count > 1000)
472 count = 1000;
473 if (count > 0)
474 wpa_auth->ip_pool = bitfield_alloc(count);
475 }
476 #endif /* CONFIG_P2P */
477
478 return wpa_auth;
479 }
480
481
wpa_init_keys(struct wpa_authenticator * wpa_auth)482 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
483 {
484 struct wpa_group *group = wpa_auth->group;
485
486 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
487 "keys");
488 wpa_group_sm_step(wpa_auth, group);
489 group->GInit = FALSE;
490 wpa_group_sm_step(wpa_auth, group);
491 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
492 return -1;
493 return 0;
494 }
495
496
497 /**
498 * wpa_deinit - Deinitialize WPA authenticator
499 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
500 */
wpa_deinit(struct wpa_authenticator * wpa_auth)501 void wpa_deinit(struct wpa_authenticator *wpa_auth)
502 {
503 struct wpa_group *group, *prev;
504
505 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
506 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
507
508 #ifdef CONFIG_PEERKEY
509 while (wpa_auth->stsl_negotiations)
510 wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations);
511 #endif /* CONFIG_PEERKEY */
512
513 pmksa_cache_auth_deinit(wpa_auth->pmksa);
514
515 #ifdef CONFIG_IEEE80211R
516 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
517 wpa_auth->ft_pmk_cache = NULL;
518 #endif /* CONFIG_IEEE80211R */
519
520 #ifdef CONFIG_P2P
521 bitfield_free(wpa_auth->ip_pool);
522 #endif /* CONFIG_P2P */
523
524
525 os_free(wpa_auth->wpa_ie);
526
527 group = wpa_auth->group;
528 while (group) {
529 prev = group;
530 group = group->next;
531 os_free(prev);
532 }
533
534 os_free(wpa_auth);
535 }
536
537
538 /**
539 * wpa_reconfig - Update WPA authenticator configuration
540 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
541 * @conf: Configuration for WPA authenticator
542 */
wpa_reconfig(struct wpa_authenticator * wpa_auth,struct wpa_auth_config * conf)543 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
544 struct wpa_auth_config *conf)
545 {
546 struct wpa_group *group;
547 if (wpa_auth == NULL)
548 return 0;
549
550 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
551 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
552 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
553 return -1;
554 }
555
556 /*
557 * Reinitialize GTK to make sure it is suitable for the new
558 * configuration.
559 */
560 group = wpa_auth->group;
561 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
562 group->GInit = TRUE;
563 wpa_group_sm_step(wpa_auth, group);
564 group->GInit = FALSE;
565 wpa_group_sm_step(wpa_auth, group);
566
567 return 0;
568 }
569
570
571 struct wpa_state_machine *
wpa_auth_sta_init(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr)572 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
573 const u8 *p2p_dev_addr)
574 {
575 struct wpa_state_machine *sm;
576
577 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
578 return NULL;
579
580 sm = os_zalloc(sizeof(struct wpa_state_machine));
581 if (sm == NULL)
582 return NULL;
583 os_memcpy(sm->addr, addr, ETH_ALEN);
584 if (p2p_dev_addr)
585 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
586
587 sm->wpa_auth = wpa_auth;
588 sm->group = wpa_auth->group;
589 wpa_group_get(sm->wpa_auth, sm->group);
590
591 return sm;
592 }
593
594
wpa_auth_sta_associated(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm)595 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
596 struct wpa_state_machine *sm)
597 {
598 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
599 return -1;
600
601 #ifdef CONFIG_IEEE80211R
602 if (sm->ft_completed) {
603 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
604 "FT authentication already completed - do not "
605 "start 4-way handshake");
606 /* Go to PTKINITDONE state to allow GTK rekeying */
607 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
608 return 0;
609 }
610 #endif /* CONFIG_IEEE80211R */
611
612 if (sm->started) {
613 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
614 sm->ReAuthenticationRequest = TRUE;
615 return wpa_sm_step(sm);
616 }
617
618 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
619 "start authentication");
620 sm->started = 1;
621
622 sm->Init = TRUE;
623 if (wpa_sm_step(sm) == 1)
624 return 1; /* should not really happen */
625 sm->Init = FALSE;
626 sm->AuthenticationRequest = TRUE;
627 return wpa_sm_step(sm);
628 }
629
630
wpa_auth_sta_no_wpa(struct wpa_state_machine * sm)631 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
632 {
633 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
634 * reassociates back to the same AP while the previous entry for the
635 * STA has not yet been removed. */
636 if (sm == NULL)
637 return;
638
639 sm->wpa_key_mgmt = 0;
640 }
641
642
wpa_free_sta_sm(struct wpa_state_machine * sm)643 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
644 {
645 #ifdef CONFIG_P2P
646 if (WPA_GET_BE32(sm->ip_addr)) {
647 u32 start;
648 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
649 "address %u.%u.%u.%u from " MACSTR,
650 sm->ip_addr[0], sm->ip_addr[1],
651 sm->ip_addr[2], sm->ip_addr[3],
652 MAC2STR(sm->addr));
653 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
654 bitfield_clear(sm->wpa_auth->ip_pool,
655 WPA_GET_BE32(sm->ip_addr) - start);
656 }
657 #endif /* CONFIG_P2P */
658 if (sm->GUpdateStationKeys) {
659 sm->group->GKeyDoneStations--;
660 sm->GUpdateStationKeys = FALSE;
661 }
662 #ifdef CONFIG_IEEE80211R
663 os_free(sm->assoc_resp_ftie);
664 wpabuf_free(sm->ft_pending_req_ies);
665 #endif /* CONFIG_IEEE80211R */
666 os_free(sm->last_rx_eapol_key);
667 os_free(sm->wpa_ie);
668 wpa_group_put(sm->wpa_auth, sm->group);
669 os_free(sm);
670 }
671
672
wpa_auth_sta_deinit(struct wpa_state_machine * sm)673 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
674 {
675 if (sm == NULL)
676 return;
677
678 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
679 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
680 "strict rekeying - force GTK rekey since STA "
681 "is leaving");
682 eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL);
683 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
684 NULL);
685 }
686
687 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
688 sm->pending_1_of_4_timeout = 0;
689 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
690 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
691 if (sm->in_step_loop) {
692 /* Must not free state machine while wpa_sm_step() is running.
693 * Freeing will be completed in the end of wpa_sm_step(). */
694 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
695 "machine deinit for " MACSTR, MAC2STR(sm->addr));
696 sm->pending_deinit = 1;
697 } else
698 wpa_free_sta_sm(sm);
699 }
700
701
wpa_request_new_ptk(struct wpa_state_machine * sm)702 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
703 {
704 if (sm == NULL)
705 return;
706
707 sm->PTKRequest = TRUE;
708 sm->PTK_valid = 0;
709 }
710
711
wpa_replay_counter_valid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)712 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
713 const u8 *replay_counter)
714 {
715 int i;
716 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
717 if (!ctr[i].valid)
718 break;
719 if (os_memcmp(replay_counter, ctr[i].counter,
720 WPA_REPLAY_COUNTER_LEN) == 0)
721 return 1;
722 }
723 return 0;
724 }
725
726
wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)727 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
728 const u8 *replay_counter)
729 {
730 int i;
731 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
732 if (ctr[i].valid &&
733 (replay_counter == NULL ||
734 os_memcmp(replay_counter, ctr[i].counter,
735 WPA_REPLAY_COUNTER_LEN) == 0))
736 ctr[i].valid = FALSE;
737 }
738 }
739
740
741 #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)742 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
743 struct wpa_state_machine *sm,
744 struct wpa_eapol_ie_parse *kde)
745 {
746 struct wpa_ie_data ie;
747 struct rsn_mdie *mdie;
748
749 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
750 ie.num_pmkid != 1 || ie.pmkid == NULL) {
751 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
752 "FT 4-way handshake message 2/4");
753 return -1;
754 }
755
756 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
757 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
758 sm->sup_pmk_r1_name, PMKID_LEN);
759
760 if (!kde->mdie || !kde->ftie) {
761 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
762 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
763 return -1;
764 }
765
766 mdie = (struct rsn_mdie *) (kde->mdie + 2);
767 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
768 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
769 MOBILITY_DOMAIN_ID_LEN) != 0) {
770 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
771 return -1;
772 }
773
774 if (sm->assoc_resp_ftie &&
775 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
776 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
777 2 + sm->assoc_resp_ftie[1]) != 0)) {
778 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
779 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
780 kde->ftie, kde->ftie_len);
781 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
782 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
783 return -1;
784 }
785
786 return 0;
787 }
788 #endif /* CONFIG_IEEE80211R */
789
790
wpa_receive_error_report(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int group)791 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
792 struct wpa_state_machine *sm, int group)
793 {
794 /* Supplicant reported a Michael MIC error */
795 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
796 "received EAPOL-Key Error Request "
797 "(STA detected Michael MIC failure (group=%d))",
798 group);
799
800 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
801 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
802 "ignore Michael MIC failure report since "
803 "group cipher is not TKIP");
804 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
805 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
806 "ignore Michael MIC failure report since "
807 "pairwise cipher is not TKIP");
808 } else {
809 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
810 return 1; /* STA entry was removed */
811 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
812 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
813 }
814
815 /*
816 * Error report is not a request for a new key handshake, but since
817 * Authenticator may do it, let's change the keys now anyway.
818 */
819 wpa_request_new_ptk(sm);
820 return 0;
821 }
822
823
wpa_try_alt_snonce(struct wpa_state_machine * sm,u8 * data,size_t data_len)824 static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data,
825 size_t data_len)
826 {
827 struct wpa_ptk PTK;
828 int ok = 0;
829 const u8 *pmk = NULL;
830
831 for (;;) {
832 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
833 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
834 sm->p2p_dev_addr, pmk);
835 if (pmk == NULL)
836 break;
837 } else
838 pmk = sm->PMK;
839
840 wpa_derive_ptk(sm, sm->alt_SNonce, pmk, &PTK);
841
842 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, data, data_len)
843 == 0) {
844 ok = 1;
845 break;
846 }
847
848 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
849 break;
850 }
851
852 if (!ok) {
853 wpa_printf(MSG_DEBUG,
854 "WPA: Earlier SNonce did not result in matching MIC");
855 return -1;
856 }
857
858 wpa_printf(MSG_DEBUG,
859 "WPA: Earlier SNonce resulted in matching MIC");
860 sm->alt_snonce_valid = 0;
861 os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN);
862 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
863 sm->PTK_valid = TRUE;
864
865 return 0;
866 }
867
868
wpa_receive(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,u8 * data,size_t data_len)869 void wpa_receive(struct wpa_authenticator *wpa_auth,
870 struct wpa_state_machine *sm,
871 u8 *data, size_t data_len)
872 {
873 struct ieee802_1x_hdr *hdr;
874 struct wpa_eapol_key *key;
875 struct wpa_eapol_key_192 *key192;
876 u16 key_info, key_data_length;
877 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST,
878 SMK_M1, SMK_M3, SMK_ERROR } msg;
879 char *msgtxt;
880 struct wpa_eapol_ie_parse kde;
881 int ft;
882 const u8 *eapol_key_ie, *key_data;
883 size_t eapol_key_ie_len, keyhdrlen, mic_len;
884
885 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
886 return;
887
888 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
889 keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key);
890
891 if (data_len < sizeof(*hdr) + keyhdrlen)
892 return;
893
894 hdr = (struct ieee802_1x_hdr *) data;
895 key = (struct wpa_eapol_key *) (hdr + 1);
896 key192 = (struct wpa_eapol_key_192 *) (hdr + 1);
897 key_info = WPA_GET_BE16(key->key_info);
898 if (mic_len == 24) {
899 key_data = (const u8 *) (key192 + 1);
900 key_data_length = WPA_GET_BE16(key192->key_data_length);
901 } else {
902 key_data = (const u8 *) (key + 1);
903 key_data_length = WPA_GET_BE16(key->key_data_length);
904 }
905 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
906 " key_info=0x%x type=%u key_data_length=%u",
907 MAC2STR(sm->addr), key_info, key->type, key_data_length);
908 if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) {
909 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
910 "key_data overflow (%d > %lu)",
911 key_data_length,
912 (unsigned long) (data_len - sizeof(*hdr) -
913 keyhdrlen));
914 return;
915 }
916
917 if (sm->wpa == WPA_VERSION_WPA2) {
918 if (key->type == EAPOL_KEY_TYPE_WPA) {
919 /*
920 * Some deployed station implementations seem to send
921 * msg 4/4 with incorrect type value in WPA2 mode.
922 */
923 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
924 "with unexpected WPA type in RSN mode");
925 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
926 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
927 "unexpected type %d in RSN mode",
928 key->type);
929 return;
930 }
931 } else {
932 if (key->type != EAPOL_KEY_TYPE_WPA) {
933 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
934 "unexpected type %d in WPA mode",
935 key->type);
936 return;
937 }
938 }
939
940 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
941 WPA_NONCE_LEN);
942 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
943 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
944
945 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
946 * are set */
947
948 if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) ==
949 (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) {
950 if (key_info & WPA_KEY_INFO_ERROR) {
951 msg = SMK_ERROR;
952 msgtxt = "SMK Error";
953 } else {
954 msg = SMK_M1;
955 msgtxt = "SMK M1";
956 }
957 } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
958 msg = SMK_M3;
959 msgtxt = "SMK M3";
960 } else if (key_info & WPA_KEY_INFO_REQUEST) {
961 msg = REQUEST;
962 msgtxt = "Request";
963 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
964 msg = GROUP_2;
965 msgtxt = "2/2 Group";
966 } else if (key_data_length == 0) {
967 msg = PAIRWISE_4;
968 msgtxt = "4/4 Pairwise";
969 } else {
970 msg = PAIRWISE_2;
971 msgtxt = "2/4 Pairwise";
972 }
973
974 /* TODO: key_info type validation for PeerKey */
975 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
976 msg == GROUP_2) {
977 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
978 if (sm->pairwise == WPA_CIPHER_CCMP ||
979 sm->pairwise == WPA_CIPHER_GCMP) {
980 if (wpa_use_aes_cmac(sm) &&
981 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN &&
982 !wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) &&
983 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
984 wpa_auth_logger(wpa_auth, sm->addr,
985 LOGGER_WARNING,
986 "advertised support for "
987 "AES-128-CMAC, but did not "
988 "use it");
989 return;
990 }
991
992 if (!wpa_use_aes_cmac(sm) &&
993 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
994 wpa_auth_logger(wpa_auth, sm->addr,
995 LOGGER_WARNING,
996 "did not use HMAC-SHA1-AES "
997 "with CCMP/GCMP");
998 return;
999 }
1000 }
1001
1002 if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) &&
1003 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
1004 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1005 "did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases");
1006 return;
1007 }
1008 }
1009
1010 if (key_info & WPA_KEY_INFO_REQUEST) {
1011 if (sm->req_replay_counter_used &&
1012 os_memcmp(key->replay_counter, sm->req_replay_counter,
1013 WPA_REPLAY_COUNTER_LEN) <= 0) {
1014 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1015 "received EAPOL-Key request with "
1016 "replayed counter");
1017 return;
1018 }
1019 }
1020
1021 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
1022 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
1023 int i;
1024
1025 if (msg == PAIRWISE_2 &&
1026 wpa_replay_counter_valid(sm->prev_key_replay,
1027 key->replay_counter) &&
1028 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1029 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
1030 {
1031 /*
1032 * Some supplicant implementations (e.g., Windows XP
1033 * WZC) update SNonce for each EAPOL-Key 2/4. This
1034 * breaks the workaround on accepting any of the
1035 * pending requests, so allow the SNonce to be updated
1036 * even if we have already sent out EAPOL-Key 3/4.
1037 */
1038 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1039 "Process SNonce update from STA "
1040 "based on retransmitted EAPOL-Key "
1041 "1/4");
1042 sm->update_snonce = 1;
1043 os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN);
1044 sm->alt_snonce_valid = TRUE;
1045 os_memcpy(sm->alt_replay_counter,
1046 sm->key_replay[0].counter,
1047 WPA_REPLAY_COUNTER_LEN);
1048 goto continue_processing;
1049 }
1050
1051 if (msg == PAIRWISE_4 && sm->alt_snonce_valid &&
1052 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1053 os_memcmp(key->replay_counter, sm->alt_replay_counter,
1054 WPA_REPLAY_COUNTER_LEN) == 0) {
1055 /*
1056 * Supplicant may still be using the old SNonce since
1057 * there was two EAPOL-Key 2/4 messages and they had
1058 * different SNonce values.
1059 */
1060 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1061 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4");
1062 goto continue_processing;
1063 }
1064
1065 if (msg == PAIRWISE_2 &&
1066 wpa_replay_counter_valid(sm->prev_key_replay,
1067 key->replay_counter) &&
1068 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
1069 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1070 "ignore retransmitted EAPOL-Key %s - "
1071 "SNonce did not change", msgtxt);
1072 } else {
1073 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1074 "received EAPOL-Key %s with "
1075 "unexpected replay counter", msgtxt);
1076 }
1077 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
1078 if (!sm->key_replay[i].valid)
1079 break;
1080 wpa_hexdump(MSG_DEBUG, "pending replay counter",
1081 sm->key_replay[i].counter,
1082 WPA_REPLAY_COUNTER_LEN);
1083 }
1084 wpa_hexdump(MSG_DEBUG, "received replay counter",
1085 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1086 return;
1087 }
1088
1089 continue_processing:
1090 switch (msg) {
1091 case PAIRWISE_2:
1092 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
1093 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
1094 (!sm->update_snonce ||
1095 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
1096 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1097 "received EAPOL-Key msg 2/4 in "
1098 "invalid state (%d) - dropped",
1099 sm->wpa_ptk_state);
1100 return;
1101 }
1102 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
1103 if (sm->group->reject_4way_hs_for_entropy) {
1104 /*
1105 * The system did not have enough entropy to generate
1106 * strong random numbers. Reject the first 4-way
1107 * handshake(s) and collect some entropy based on the
1108 * information from it. Once enough entropy is
1109 * available, the next atempt will trigger GMK/Key
1110 * Counter update and the station will be allowed to
1111 * continue.
1112 */
1113 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
1114 "collect more entropy for random number "
1115 "generation");
1116 random_mark_pool_ready();
1117 wpa_sta_disconnect(wpa_auth, sm->addr);
1118 return;
1119 }
1120 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
1121 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1122 "received EAPOL-Key msg 2/4 with "
1123 "invalid Key Data contents");
1124 return;
1125 }
1126 if (kde.rsn_ie) {
1127 eapol_key_ie = kde.rsn_ie;
1128 eapol_key_ie_len = kde.rsn_ie_len;
1129 } else if (kde.osen) {
1130 eapol_key_ie = kde.osen;
1131 eapol_key_ie_len = kde.osen_len;
1132 } else {
1133 eapol_key_ie = kde.wpa_ie;
1134 eapol_key_ie_len = kde.wpa_ie_len;
1135 }
1136 ft = sm->wpa == WPA_VERSION_WPA2 &&
1137 wpa_key_mgmt_ft(sm->wpa_key_mgmt);
1138 if (sm->wpa_ie == NULL ||
1139 wpa_compare_rsn_ie(ft,
1140 sm->wpa_ie, sm->wpa_ie_len,
1141 eapol_key_ie, eapol_key_ie_len)) {
1142 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1143 "WPA IE from (Re)AssocReq did not "
1144 "match with msg 2/4");
1145 if (sm->wpa_ie) {
1146 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
1147 sm->wpa_ie, sm->wpa_ie_len);
1148 }
1149 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
1150 eapol_key_ie, eapol_key_ie_len);
1151 /* MLME-DEAUTHENTICATE.request */
1152 wpa_sta_disconnect(wpa_auth, sm->addr);
1153 return;
1154 }
1155 #ifdef CONFIG_IEEE80211R
1156 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
1157 wpa_sta_disconnect(wpa_auth, sm->addr);
1158 return;
1159 }
1160 #endif /* CONFIG_IEEE80211R */
1161 #ifdef CONFIG_P2P
1162 if (kde.ip_addr_req && kde.ip_addr_req[0] &&
1163 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
1164 int idx;
1165 wpa_printf(MSG_DEBUG, "P2P: IP address requested in "
1166 "EAPOL-Key exchange");
1167 idx = bitfield_get_first_zero(wpa_auth->ip_pool);
1168 if (idx >= 0) {
1169 u32 start = WPA_GET_BE32(wpa_auth->conf.
1170 ip_addr_start);
1171 bitfield_set(wpa_auth->ip_pool, idx);
1172 WPA_PUT_BE32(sm->ip_addr, start + idx);
1173 wpa_printf(MSG_DEBUG, "P2P: Assigned IP "
1174 "address %u.%u.%u.%u to " MACSTR,
1175 sm->ip_addr[0], sm->ip_addr[1],
1176 sm->ip_addr[2], sm->ip_addr[3],
1177 MAC2STR(sm->addr));
1178 }
1179 }
1180 #endif /* CONFIG_P2P */
1181 break;
1182 case PAIRWISE_4:
1183 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1184 !sm->PTK_valid) {
1185 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1186 "received EAPOL-Key msg 4/4 in "
1187 "invalid state (%d) - dropped",
1188 sm->wpa_ptk_state);
1189 return;
1190 }
1191 break;
1192 case GROUP_2:
1193 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1194 || !sm->PTK_valid) {
1195 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1196 "received EAPOL-Key msg 2/2 in "
1197 "invalid state (%d) - dropped",
1198 sm->wpa_ptk_group_state);
1199 return;
1200 }
1201 break;
1202 #ifdef CONFIG_PEERKEY
1203 case SMK_M1:
1204 case SMK_M3:
1205 case SMK_ERROR:
1206 if (!wpa_auth->conf.peerkey) {
1207 wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but "
1208 "PeerKey use disabled - ignoring message");
1209 return;
1210 }
1211 if (!sm->PTK_valid) {
1212 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1213 "received EAPOL-Key msg SMK in "
1214 "invalid state - dropped");
1215 return;
1216 }
1217 break;
1218 #else /* CONFIG_PEERKEY */
1219 case SMK_M1:
1220 case SMK_M3:
1221 case SMK_ERROR:
1222 return; /* STSL disabled - ignore SMK messages */
1223 #endif /* CONFIG_PEERKEY */
1224 case REQUEST:
1225 break;
1226 }
1227
1228 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1229 "received EAPOL-Key frame (%s)", msgtxt);
1230
1231 if (key_info & WPA_KEY_INFO_ACK) {
1232 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1233 "received invalid EAPOL-Key: Key Ack set");
1234 return;
1235 }
1236
1237 if (!(key_info & WPA_KEY_INFO_MIC)) {
1238 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1239 "received invalid EAPOL-Key: Key MIC not set");
1240 return;
1241 }
1242
1243 sm->MICVerified = FALSE;
1244 if (sm->PTK_valid && !sm->update_snonce) {
1245 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &sm->PTK, data,
1246 data_len) &&
1247 (msg != PAIRWISE_4 || !sm->alt_snonce_valid ||
1248 wpa_try_alt_snonce(sm, data, data_len))) {
1249 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1250 "received EAPOL-Key with invalid MIC");
1251 return;
1252 }
1253 sm->MICVerified = TRUE;
1254 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1255 sm->pending_1_of_4_timeout = 0;
1256 }
1257
1258 if (key_info & WPA_KEY_INFO_REQUEST) {
1259 if (sm->MICVerified) {
1260 sm->req_replay_counter_used = 1;
1261 os_memcpy(sm->req_replay_counter, key->replay_counter,
1262 WPA_REPLAY_COUNTER_LEN);
1263 } else {
1264 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1265 "received EAPOL-Key request with "
1266 "invalid MIC");
1267 return;
1268 }
1269
1270 /*
1271 * TODO: should decrypt key data field if encryption was used;
1272 * even though MAC address KDE is not normally encrypted,
1273 * supplicant is allowed to encrypt it.
1274 */
1275 if (msg == SMK_ERROR) {
1276 #ifdef CONFIG_PEERKEY
1277 wpa_smk_error(wpa_auth, sm, key_data, key_data_length);
1278 #endif /* CONFIG_PEERKEY */
1279 return;
1280 } else if (key_info & WPA_KEY_INFO_ERROR) {
1281 if (wpa_receive_error_report(
1282 wpa_auth, sm,
1283 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1284 return; /* STA entry was removed */
1285 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1286 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1287 "received EAPOL-Key Request for new "
1288 "4-Way Handshake");
1289 wpa_request_new_ptk(sm);
1290 #ifdef CONFIG_PEERKEY
1291 } else if (msg == SMK_M1) {
1292 wpa_smk_m1(wpa_auth, sm, key, key_data,
1293 key_data_length);
1294 #endif /* CONFIG_PEERKEY */
1295 } else if (key_data_length > 0 &&
1296 wpa_parse_kde_ies(key_data, key_data_length,
1297 &kde) == 0 &&
1298 kde.mac_addr) {
1299 } else {
1300 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1301 "received EAPOL-Key Request for GTK "
1302 "rekeying");
1303 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1304 wpa_rekey_gtk(wpa_auth, NULL);
1305 }
1306 } else {
1307 /* Do not allow the same key replay counter to be reused. */
1308 wpa_replay_counter_mark_invalid(sm->key_replay,
1309 key->replay_counter);
1310
1311 if (msg == PAIRWISE_2) {
1312 /*
1313 * Maintain a copy of the pending EAPOL-Key frames in
1314 * case the EAPOL-Key frame was retransmitted. This is
1315 * needed to allow EAPOL-Key msg 2/4 reply to another
1316 * pending msg 1/4 to update the SNonce to work around
1317 * unexpected supplicant behavior.
1318 */
1319 os_memcpy(sm->prev_key_replay, sm->key_replay,
1320 sizeof(sm->key_replay));
1321 } else {
1322 os_memset(sm->prev_key_replay, 0,
1323 sizeof(sm->prev_key_replay));
1324 }
1325
1326 /*
1327 * Make sure old valid counters are not accepted anymore and
1328 * do not get copied again.
1329 */
1330 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1331 }
1332
1333 #ifdef CONFIG_PEERKEY
1334 if (msg == SMK_M3) {
1335 wpa_smk_m3(wpa_auth, sm, key, key_data, key_data_length);
1336 return;
1337 }
1338 #endif /* CONFIG_PEERKEY */
1339
1340 os_free(sm->last_rx_eapol_key);
1341 sm->last_rx_eapol_key = os_malloc(data_len);
1342 if (sm->last_rx_eapol_key == NULL)
1343 return;
1344 os_memcpy(sm->last_rx_eapol_key, data, data_len);
1345 sm->last_rx_eapol_key_len = data_len;
1346
1347 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1348 sm->EAPOLKeyReceived = TRUE;
1349 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1350 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1351 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1352 wpa_sm_step(sm);
1353 }
1354
1355
wpa_gmk_to_gtk(const u8 * gmk,const char * label,const u8 * addr,const u8 * gnonce,u8 * gtk,size_t gtk_len)1356 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1357 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1358 {
1359 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16];
1360 u8 *pos;
1361 int ret = 0;
1362
1363 /* GTK = PRF-X(GMK, "Group key expansion",
1364 * AA || GNonce || Time || random data)
1365 * The example described in the IEEE 802.11 standard uses only AA and
1366 * GNonce as inputs here. Add some more entropy since this derivation
1367 * is done only at the Authenticator and as such, does not need to be
1368 * exactly same.
1369 */
1370 os_memcpy(data, addr, ETH_ALEN);
1371 os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN);
1372 pos = data + ETH_ALEN + WPA_NONCE_LEN;
1373 wpa_get_ntp_timestamp(pos);
1374 pos += 8;
1375 if (random_get_bytes(pos, 16) < 0)
1376 ret = -1;
1377
1378 #ifdef CONFIG_IEEE80211W
1379 sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len);
1380 #else /* CONFIG_IEEE80211W */
1381 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len)
1382 < 0)
1383 ret = -1;
1384 #endif /* CONFIG_IEEE80211W */
1385
1386 return ret;
1387 }
1388
1389
wpa_send_eapol_timeout(void * eloop_ctx,void * timeout_ctx)1390 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1391 {
1392 struct wpa_authenticator *wpa_auth = eloop_ctx;
1393 struct wpa_state_machine *sm = timeout_ctx;
1394
1395 sm->pending_1_of_4_timeout = 0;
1396 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1397 sm->TimeoutEvt = TRUE;
1398 wpa_sm_step(sm);
1399 }
1400
1401
__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)1402 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1403 struct wpa_state_machine *sm, int key_info,
1404 const u8 *key_rsc, const u8 *nonce,
1405 const u8 *kde, size_t kde_len,
1406 int keyidx, int encr, int force_version)
1407 {
1408 struct ieee802_1x_hdr *hdr;
1409 struct wpa_eapol_key *key;
1410 struct wpa_eapol_key_192 *key192;
1411 size_t len, mic_len, keyhdrlen;
1412 int alg;
1413 int key_data_len, pad_len = 0;
1414 u8 *buf, *pos;
1415 int version, pairwise;
1416 int i;
1417 u8 *key_data;
1418
1419 mic_len = wpa_mic_len(sm->wpa_key_mgmt);
1420 keyhdrlen = mic_len == 24 ? sizeof(*key192) : sizeof(*key);
1421
1422 len = sizeof(struct ieee802_1x_hdr) + keyhdrlen;
1423
1424 if (force_version)
1425 version = force_version;
1426 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1427 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt))
1428 version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1429 else if (wpa_use_aes_cmac(sm))
1430 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1431 else if (sm->pairwise != WPA_CIPHER_TKIP)
1432 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1433 else
1434 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1435
1436 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1437
1438 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1439 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1440 "encr=%d)",
1441 version,
1442 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1443 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1444 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1445 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1446 pairwise, (unsigned long) kde_len, keyidx, encr);
1447
1448 key_data_len = kde_len;
1449
1450 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1451 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1452 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1453 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1454 pad_len = key_data_len % 8;
1455 if (pad_len)
1456 pad_len = 8 - pad_len;
1457 key_data_len += pad_len + 8;
1458 }
1459
1460 len += key_data_len;
1461
1462 hdr = os_zalloc(len);
1463 if (hdr == NULL)
1464 return;
1465 hdr->version = wpa_auth->conf.eapol_version;
1466 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1467 hdr->length = host_to_be16(len - sizeof(*hdr));
1468 key = (struct wpa_eapol_key *) (hdr + 1);
1469 key192 = (struct wpa_eapol_key_192 *) (hdr + 1);
1470 key_data = ((u8 *) (hdr + 1)) + keyhdrlen;
1471
1472 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1473 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1474 key_info |= version;
1475 if (encr && sm->wpa == WPA_VERSION_WPA2)
1476 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1477 if (sm->wpa != WPA_VERSION_WPA2)
1478 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1479 WPA_PUT_BE16(key->key_info, key_info);
1480
1481 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1482 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1483 if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
1484 WPA_PUT_BE16(key->key_length, 0);
1485
1486 /* FIX: STSL: what to use as key_replay_counter? */
1487 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1488 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1489 os_memcpy(sm->key_replay[i].counter,
1490 sm->key_replay[i - 1].counter,
1491 WPA_REPLAY_COUNTER_LEN);
1492 }
1493 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1494 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1495 WPA_REPLAY_COUNTER_LEN);
1496 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter",
1497 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1498 sm->key_replay[0].valid = TRUE;
1499
1500 if (nonce)
1501 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1502
1503 if (key_rsc)
1504 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1505
1506 if (kde && !encr) {
1507 os_memcpy(key_data, kde, kde_len);
1508 if (mic_len == 24)
1509 WPA_PUT_BE16(key192->key_data_length, kde_len);
1510 else
1511 WPA_PUT_BE16(key->key_data_length, kde_len);
1512 } else if (encr && kde) {
1513 buf = os_zalloc(key_data_len);
1514 if (buf == NULL) {
1515 os_free(hdr);
1516 return;
1517 }
1518 pos = buf;
1519 os_memcpy(pos, kde, kde_len);
1520 pos += kde_len;
1521
1522 if (pad_len)
1523 *pos++ = 0xdd;
1524
1525 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1526 buf, key_data_len);
1527 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1528 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN ||
1529 wpa_key_mgmt_suite_b(sm->wpa_key_mgmt) ||
1530 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1531 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len,
1532 (key_data_len - 8) / 8, buf, key_data)) {
1533 os_free(hdr);
1534 os_free(buf);
1535 return;
1536 }
1537 if (mic_len == 24)
1538 WPA_PUT_BE16(key192->key_data_length,
1539 key_data_len);
1540 else
1541 WPA_PUT_BE16(key->key_data_length,
1542 key_data_len);
1543 } else if (sm->PTK.kek_len == 16) {
1544 u8 ek[32];
1545 os_memcpy(key->key_iv,
1546 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1547 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1548 os_memcpy(ek, key->key_iv, 16);
1549 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len);
1550 os_memcpy(key_data, buf, key_data_len);
1551 rc4_skip(ek, 32, 256, key_data, key_data_len);
1552 if (mic_len == 24)
1553 WPA_PUT_BE16(key192->key_data_length,
1554 key_data_len);
1555 else
1556 WPA_PUT_BE16(key->key_data_length,
1557 key_data_len);
1558 } else {
1559 os_free(hdr);
1560 os_free(buf);
1561 return;
1562 }
1563 os_free(buf);
1564 }
1565
1566 if (key_info & WPA_KEY_INFO_MIC) {
1567 u8 *key_mic;
1568
1569 if (!sm->PTK_valid) {
1570 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1571 "PTK not valid when sending EAPOL-Key "
1572 "frame");
1573 os_free(hdr);
1574 return;
1575 }
1576
1577 key_mic = key192->key_mic; /* same offset for key and key192 */
1578 wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
1579 sm->wpa_key_mgmt, version,
1580 (u8 *) hdr, len, key_mic);
1581 #ifdef CONFIG_TESTING_OPTIONS
1582 if (!pairwise &&
1583 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1584 drand48() <
1585 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1586 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1587 "Corrupting group EAPOL-Key Key MIC");
1588 key_mic[0]++;
1589 }
1590 #endif /* CONFIG_TESTING_OPTIONS */
1591 }
1592
1593 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1594 1);
1595 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1596 sm->pairwise_set);
1597 os_free(hdr);
1598 }
1599
1600
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)1601 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1602 struct wpa_state_machine *sm, int key_info,
1603 const u8 *key_rsc, const u8 *nonce,
1604 const u8 *kde, size_t kde_len,
1605 int keyidx, int encr)
1606 {
1607 int timeout_ms;
1608 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1609 int ctr;
1610
1611 if (sm == NULL)
1612 return;
1613
1614 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1615 keyidx, encr, 0);
1616
1617 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1618 if (ctr == 1 && wpa_auth->conf.tx_status)
1619 timeout_ms = pairwise ? eapol_key_timeout_first :
1620 eapol_key_timeout_first_group;
1621 else
1622 timeout_ms = eapol_key_timeout_subseq;
1623 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1624 sm->pending_1_of_4_timeout = 1;
1625 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1626 "counter %d)", timeout_ms, ctr);
1627 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1628 wpa_send_eapol_timeout, wpa_auth, sm);
1629 }
1630
1631
wpa_verify_key_mic(int akmp,struct wpa_ptk * PTK,u8 * data,size_t data_len)1632 static int wpa_verify_key_mic(int akmp, struct wpa_ptk *PTK, u8 *data,
1633 size_t data_len)
1634 {
1635 struct ieee802_1x_hdr *hdr;
1636 struct wpa_eapol_key *key;
1637 struct wpa_eapol_key_192 *key192;
1638 u16 key_info;
1639 int ret = 0;
1640 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
1641 size_t mic_len = wpa_mic_len(akmp);
1642
1643 if (data_len < sizeof(*hdr) + sizeof(*key))
1644 return -1;
1645
1646 hdr = (struct ieee802_1x_hdr *) data;
1647 key = (struct wpa_eapol_key *) (hdr + 1);
1648 key192 = (struct wpa_eapol_key_192 *) (hdr + 1);
1649 key_info = WPA_GET_BE16(key->key_info);
1650 os_memcpy(mic, key192->key_mic, mic_len);
1651 os_memset(key192->key_mic, 0, mic_len);
1652 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp,
1653 key_info & WPA_KEY_INFO_TYPE_MASK,
1654 data, data_len, key192->key_mic) ||
1655 os_memcmp_const(mic, key192->key_mic, mic_len) != 0)
1656 ret = -1;
1657 os_memcpy(key192->key_mic, mic, mic_len);
1658 return ret;
1659 }
1660
1661
wpa_remove_ptk(struct wpa_state_machine * sm)1662 void wpa_remove_ptk(struct wpa_state_machine *sm)
1663 {
1664 sm->PTK_valid = FALSE;
1665 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1666 wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0);
1667 sm->pairwise_set = FALSE;
1668 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1669 }
1670
1671
wpa_auth_sm_event(struct wpa_state_machine * sm,wpa_event event)1672 int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event)
1673 {
1674 int remove_ptk = 1;
1675
1676 if (sm == NULL)
1677 return -1;
1678
1679 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1680 "event %d notification", event);
1681
1682 switch (event) {
1683 case WPA_AUTH:
1684 #ifdef CONFIG_MESH
1685 /* PTKs are derived through AMPE */
1686 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) {
1687 /* not mesh */
1688 break;
1689 }
1690 return 0;
1691 #endif /* CONFIG_MESH */
1692 case WPA_ASSOC:
1693 break;
1694 case WPA_DEAUTH:
1695 case WPA_DISASSOC:
1696 sm->DeauthenticationRequest = TRUE;
1697 break;
1698 case WPA_REAUTH:
1699 case WPA_REAUTH_EAPOL:
1700 if (!sm->started) {
1701 /*
1702 * When using WPS, we may end up here if the STA
1703 * manages to re-associate without the previous STA
1704 * entry getting removed. Consequently, we need to make
1705 * sure that the WPA state machines gets initialized
1706 * properly at this point.
1707 */
1708 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1709 "started - initialize now");
1710 sm->started = 1;
1711 sm->Init = TRUE;
1712 if (wpa_sm_step(sm) == 1)
1713 return 1; /* should not really happen */
1714 sm->Init = FALSE;
1715 sm->AuthenticationRequest = TRUE;
1716 break;
1717 }
1718 if (sm->GUpdateStationKeys) {
1719 /*
1720 * Reauthentication cancels the pending group key
1721 * update for this STA.
1722 */
1723 sm->group->GKeyDoneStations--;
1724 sm->GUpdateStationKeys = FALSE;
1725 sm->PtkGroupInit = TRUE;
1726 }
1727 sm->ReAuthenticationRequest = TRUE;
1728 break;
1729 case WPA_ASSOC_FT:
1730 #ifdef CONFIG_IEEE80211R
1731 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1732 "after association");
1733 wpa_ft_install_ptk(sm);
1734
1735 /* Using FT protocol, not WPA auth state machine */
1736 sm->ft_completed = 1;
1737 return 0;
1738 #else /* CONFIG_IEEE80211R */
1739 break;
1740 #endif /* CONFIG_IEEE80211R */
1741 }
1742
1743 #ifdef CONFIG_IEEE80211R
1744 sm->ft_completed = 0;
1745 #endif /* CONFIG_IEEE80211R */
1746
1747 #ifdef CONFIG_IEEE80211W
1748 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1749 remove_ptk = 0;
1750 #endif /* CONFIG_IEEE80211W */
1751
1752 if (remove_ptk) {
1753 sm->PTK_valid = FALSE;
1754 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1755
1756 if (event != WPA_REAUTH_EAPOL)
1757 wpa_remove_ptk(sm);
1758 }
1759
1760 return wpa_sm_step(sm);
1761 }
1762
1763
SM_STATE(WPA_PTK,INITIALIZE)1764 SM_STATE(WPA_PTK, INITIALIZE)
1765 {
1766 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1767 if (sm->Init) {
1768 /* Init flag is not cleared here, so avoid busy
1769 * loop by claiming nothing changed. */
1770 sm->changed = FALSE;
1771 }
1772
1773 sm->keycount = 0;
1774 if (sm->GUpdateStationKeys)
1775 sm->group->GKeyDoneStations--;
1776 sm->GUpdateStationKeys = FALSE;
1777 if (sm->wpa == WPA_VERSION_WPA)
1778 sm->PInitAKeys = FALSE;
1779 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1780 * Local AA > Remote AA)) */) {
1781 sm->Pair = TRUE;
1782 }
1783 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1784 wpa_remove_ptk(sm);
1785 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1786 sm->TimeoutCtr = 0;
1787 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
1788 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1789 WPA_EAPOL_authorized, 0);
1790 }
1791 }
1792
1793
SM_STATE(WPA_PTK,DISCONNECT)1794 SM_STATE(WPA_PTK, DISCONNECT)
1795 {
1796 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1797 sm->Disconnect = FALSE;
1798 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
1799 }
1800
1801
SM_STATE(WPA_PTK,DISCONNECTED)1802 SM_STATE(WPA_PTK, DISCONNECTED)
1803 {
1804 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1805 sm->DeauthenticationRequest = FALSE;
1806 }
1807
1808
SM_STATE(WPA_PTK,AUTHENTICATION)1809 SM_STATE(WPA_PTK, AUTHENTICATION)
1810 {
1811 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1812 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1813 sm->PTK_valid = FALSE;
1814 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1815 1);
1816 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1817 sm->AuthenticationRequest = FALSE;
1818 }
1819
1820
wpa_group_ensure_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)1821 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1822 struct wpa_group *group)
1823 {
1824 if (group->first_sta_seen)
1825 return;
1826 /*
1827 * System has run bit further than at the time hostapd was started
1828 * potentially very early during boot up. This provides better chances
1829 * of collecting more randomness on embedded systems. Re-initialize the
1830 * GMK and Counter here to improve their strength if there was not
1831 * enough entropy available immediately after system startup.
1832 */
1833 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1834 "station");
1835 if (random_pool_ready() != 1) {
1836 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1837 "to proceed - reject first 4-way handshake");
1838 group->reject_4way_hs_for_entropy = TRUE;
1839 } else {
1840 group->first_sta_seen = TRUE;
1841 group->reject_4way_hs_for_entropy = FALSE;
1842 }
1843
1844 wpa_group_init_gmk_and_counter(wpa_auth, group);
1845 wpa_gtk_update(wpa_auth, group);
1846 wpa_group_config_group_keys(wpa_auth, group);
1847 }
1848
1849
SM_STATE(WPA_PTK,AUTHENTICATION2)1850 SM_STATE(WPA_PTK, AUTHENTICATION2)
1851 {
1852 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1853
1854 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1855 sm->ReAuthenticationRequest = FALSE;
1856
1857 /*
1858 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1859 * ambiguous. The Authenticator state machine uses a counter that is
1860 * incremented by one for each 4-way handshake. However, the security
1861 * analysis of 4-way handshake points out that unpredictable nonces
1862 * help in preventing precomputation attacks. Instead of the state
1863 * machine definition, use an unpredictable nonce value here to provide
1864 * stronger protection against potential precomputation attacks.
1865 */
1866 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1867 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1868 "ANonce.");
1869 sm->Disconnect = TRUE;
1870 return;
1871 }
1872 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1873 WPA_NONCE_LEN);
1874 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1875 * logical place than INITIALIZE since AUTHENTICATION2 can be
1876 * re-entered on ReAuthenticationRequest without going through
1877 * INITIALIZE. */
1878 sm->TimeoutCtr = 0;
1879 }
1880
1881
SM_STATE(WPA_PTK,INITPMK)1882 SM_STATE(WPA_PTK, INITPMK)
1883 {
1884 u8 msk[2 * PMK_LEN];
1885 size_t len = 2 * PMK_LEN;
1886
1887 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1888 #ifdef CONFIG_IEEE80211R
1889 sm->xxkey_len = 0;
1890 #endif /* CONFIG_IEEE80211R */
1891 if (sm->pmksa) {
1892 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1893 os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN);
1894 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1895 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
1896 "(len=%lu)", (unsigned long) len);
1897 os_memcpy(sm->PMK, msk, PMK_LEN);
1898 #ifdef CONFIG_IEEE80211R
1899 if (len >= 2 * PMK_LEN) {
1900 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
1901 sm->xxkey_len = PMK_LEN;
1902 }
1903 #endif /* CONFIG_IEEE80211R */
1904 } else {
1905 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p",
1906 sm->wpa_auth->cb.get_msk);
1907 sm->Disconnect = TRUE;
1908 return;
1909 }
1910 os_memset(msk, 0, sizeof(msk));
1911
1912 sm->req_replay_counter_used = 0;
1913 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
1914 * will break reauthentication since EAPOL state machines may not be
1915 * get into AUTHENTICATING state that clears keyRun before WPA state
1916 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
1917 * state and takes PMK from the previously used AAA Key. This will
1918 * eventually fail in 4-Way Handshake because Supplicant uses PMK
1919 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
1920 * be good workaround for this issue. */
1921 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
1922 }
1923
1924
SM_STATE(WPA_PTK,INITPSK)1925 SM_STATE(WPA_PTK, INITPSK)
1926 {
1927 const u8 *psk;
1928 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
1929 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL);
1930 if (psk) {
1931 os_memcpy(sm->PMK, psk, PMK_LEN);
1932 #ifdef CONFIG_IEEE80211R
1933 os_memcpy(sm->xxkey, psk, PMK_LEN);
1934 sm->xxkey_len = PMK_LEN;
1935 #endif /* CONFIG_IEEE80211R */
1936 }
1937 sm->req_replay_counter_used = 0;
1938 }
1939
1940
SM_STATE(WPA_PTK,PTKSTART)1941 SM_STATE(WPA_PTK, PTKSTART)
1942 {
1943 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
1944 size_t pmkid_len = 0;
1945
1946 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
1947 sm->PTKRequest = FALSE;
1948 sm->TimeoutEvt = FALSE;
1949 sm->alt_snonce_valid = FALSE;
1950
1951 sm->TimeoutCtr++;
1952 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
1953 /* No point in sending the EAPOL-Key - we will disconnect
1954 * immediately following this. */
1955 return;
1956 }
1957
1958 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1959 "sending 1/4 msg of 4-Way Handshake");
1960 /*
1961 * TODO: Could add PMKID even with WPA2-PSK, but only if there is only
1962 * one possible PSK for this STA.
1963 */
1964 if (sm->wpa == WPA_VERSION_WPA2 &&
1965 wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
1966 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
1967 pmkid = buf;
1968 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
1969 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
1970 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
1971 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
1972 if (sm->pmksa) {
1973 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
1974 sm->pmksa->pmkid, PMKID_LEN);
1975 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) {
1976 /* No KCK available to derive PMKID */
1977 pmkid = NULL;
1978 } else {
1979 /*
1980 * Calculate PMKID since no PMKSA cache entry was
1981 * available with pre-calculated PMKID.
1982 */
1983 rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr,
1984 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
1985 wpa_key_mgmt_sha256(sm->wpa_key_mgmt));
1986 }
1987 }
1988 wpa_send_eapol(sm->wpa_auth, sm,
1989 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
1990 sm->ANonce, pmkid, pmkid_len, 0, 0);
1991 }
1992
1993
wpa_derive_ptk(struct wpa_state_machine * sm,const u8 * snonce,const u8 * pmk,struct wpa_ptk * ptk)1994 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
1995 const u8 *pmk, struct wpa_ptk *ptk)
1996 {
1997 #ifdef CONFIG_IEEE80211R
1998 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
1999 return wpa_auth_derive_ptk_ft(sm, pmk, ptk);
2000 #endif /* CONFIG_IEEE80211R */
2001
2002 return wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion",
2003 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce,
2004 ptk, sm->wpa_key_mgmt, sm->pairwise);
2005 }
2006
2007
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING)2008 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
2009 {
2010 struct wpa_ptk PTK;
2011 int ok = 0, psk_found = 0;
2012 const u8 *pmk = NULL;
2013
2014 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
2015 sm->EAPOLKeyReceived = FALSE;
2016 sm->update_snonce = FALSE;
2017
2018 /* WPA with IEEE 802.1X: use the derived PMK from EAP
2019 * WPA-PSK: iterate through possible PSKs and select the one matching
2020 * the packet */
2021 for (;;) {
2022 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2023 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
2024 sm->p2p_dev_addr, pmk);
2025 if (pmk == NULL)
2026 break;
2027 psk_found = 1;
2028 } else
2029 pmk = sm->PMK;
2030
2031 wpa_derive_ptk(sm, sm->SNonce, pmk, &PTK);
2032
2033 if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK,
2034 sm->last_rx_eapol_key,
2035 sm->last_rx_eapol_key_len) == 0) {
2036 ok = 1;
2037 break;
2038 }
2039
2040 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt))
2041 break;
2042 }
2043
2044 if (!ok) {
2045 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2046 "invalid MIC in msg 2/4 of 4-Way Handshake");
2047 if (psk_found)
2048 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr);
2049 return;
2050 }
2051
2052 #ifdef CONFIG_IEEE80211R
2053 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2054 /*
2055 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
2056 * with the value we derived.
2057 */
2058 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
2059 WPA_PMK_NAME_LEN) != 0) {
2060 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2061 "PMKR1Name mismatch in FT 4-way "
2062 "handshake");
2063 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
2064 "Supplicant",
2065 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
2066 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
2067 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
2068 return;
2069 }
2070 }
2071 #endif /* CONFIG_IEEE80211R */
2072
2073 sm->pending_1_of_4_timeout = 0;
2074 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
2075
2076 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2077 /* PSK may have changed from the previous choice, so update
2078 * state machine data based on whatever PSK was selected here.
2079 */
2080 os_memcpy(sm->PMK, pmk, PMK_LEN);
2081 }
2082
2083 sm->MICVerified = TRUE;
2084
2085 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
2086 sm->PTK_valid = TRUE;
2087 }
2088
2089
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING2)2090 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
2091 {
2092 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
2093 sm->TimeoutCtr = 0;
2094 }
2095
2096
2097 #ifdef CONFIG_IEEE80211W
2098
ieee80211w_kde_len(struct wpa_state_machine * sm)2099 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2100 {
2101 if (sm->mgmt_frame_prot) {
2102 size_t len;
2103 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2104 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
2105 }
2106
2107 return 0;
2108 }
2109
2110
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)2111 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2112 {
2113 struct wpa_igtk_kde igtk;
2114 struct wpa_group *gsm = sm->group;
2115 u8 rsc[WPA_KEY_RSC_LEN];
2116 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2117
2118 if (!sm->mgmt_frame_prot)
2119 return pos;
2120
2121 igtk.keyid[0] = gsm->GN_igtk;
2122 igtk.keyid[1] = 0;
2123 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
2124 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
2125 os_memset(igtk.pn, 0, sizeof(igtk.pn));
2126 else
2127 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
2128 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
2129 if (sm->wpa_auth->conf.disable_gtk) {
2130 /*
2131 * Provide unique random IGTK to each STA to prevent use of
2132 * IGTK in the BSS.
2133 */
2134 if (random_get_bytes(igtk.igtk, len) < 0)
2135 return pos;
2136 }
2137 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
2138 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
2139 NULL, 0);
2140
2141 return pos;
2142 }
2143
2144 #else /* CONFIG_IEEE80211W */
2145
ieee80211w_kde_len(struct wpa_state_machine * sm)2146 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2147 {
2148 return 0;
2149 }
2150
2151
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)2152 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
2153 {
2154 return pos;
2155 }
2156
2157 #endif /* CONFIG_IEEE80211W */
2158
2159
SM_STATE(WPA_PTK,PTKINITNEGOTIATING)2160 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
2161 {
2162 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
2163 size_t gtk_len, kde_len;
2164 struct wpa_group *gsm = sm->group;
2165 u8 *wpa_ie;
2166 int wpa_ie_len, secure, keyidx, encr = 0;
2167
2168 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
2169 sm->TimeoutEvt = FALSE;
2170
2171 sm->TimeoutCtr++;
2172 if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) {
2173 /* No point in sending the EAPOL-Key - we will disconnect
2174 * immediately following this. */
2175 return;
2176 }
2177
2178 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
2179 GTK[GN], IGTK, [FTIE], [TIE * 2])
2180 */
2181 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2182 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2183 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
2184 wpa_ie = sm->wpa_auth->wpa_ie;
2185 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
2186 if (sm->wpa == WPA_VERSION_WPA &&
2187 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
2188 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
2189 /* WPA-only STA, remove RSN IE and possible MDIE */
2190 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2191 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
2192 wpa_ie = wpa_ie + wpa_ie[1] + 2;
2193 wpa_ie_len = wpa_ie[1] + 2;
2194 }
2195 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2196 "sending 3/4 msg of 4-Way Handshake");
2197 if (sm->wpa == WPA_VERSION_WPA2) {
2198 /* WPA2 send GTK in the 4-way handshake */
2199 secure = 1;
2200 gtk = gsm->GTK[gsm->GN - 1];
2201 gtk_len = gsm->GTK_len;
2202 if (sm->wpa_auth->conf.disable_gtk) {
2203 /*
2204 * Provide unique random GTK to each STA to prevent use
2205 * of GTK in the BSS.
2206 */
2207 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
2208 return;
2209 gtk = dummy_gtk;
2210 }
2211 keyidx = gsm->GN;
2212 _rsc = rsc;
2213 encr = 1;
2214 } else {
2215 /* WPA does not include GTK in msg 3/4 */
2216 secure = 0;
2217 gtk = NULL;
2218 gtk_len = 0;
2219 keyidx = 0;
2220 _rsc = NULL;
2221 if (sm->rx_eapol_key_secure) {
2222 /*
2223 * It looks like Windows 7 supplicant tries to use
2224 * Secure bit in msg 2/4 after having reported Michael
2225 * MIC failure and it then rejects the 4-way handshake
2226 * if msg 3/4 does not set Secure bit. Work around this
2227 * by setting the Secure bit here even in the case of
2228 * WPA if the supplicant used it first.
2229 */
2230 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2231 "STA used Secure bit in WPA msg 2/4 - "
2232 "set Secure for 3/4 as workaround");
2233 secure = 1;
2234 }
2235 }
2236
2237 kde_len = wpa_ie_len + ieee80211w_kde_len(sm);
2238 if (gtk)
2239 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
2240 #ifdef CONFIG_IEEE80211R
2241 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2242 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
2243 kde_len += 300; /* FTIE + 2 * TIE */
2244 }
2245 #endif /* CONFIG_IEEE80211R */
2246 #ifdef CONFIG_P2P
2247 if (WPA_GET_BE32(sm->ip_addr) > 0)
2248 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
2249 #endif /* CONFIG_P2P */
2250 kde = os_malloc(kde_len);
2251 if (kde == NULL)
2252 return;
2253
2254 pos = kde;
2255 os_memcpy(pos, wpa_ie, wpa_ie_len);
2256 pos += wpa_ie_len;
2257 #ifdef CONFIG_IEEE80211R
2258 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2259 int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name);
2260 if (res < 0) {
2261 wpa_printf(MSG_ERROR, "FT: Failed to insert "
2262 "PMKR1Name into RSN IE in EAPOL-Key data");
2263 os_free(kde);
2264 return;
2265 }
2266 pos += res;
2267 }
2268 #endif /* CONFIG_IEEE80211R */
2269 if (gtk) {
2270 u8 hdr[2];
2271 hdr[0] = keyidx & 0x03;
2272 hdr[1] = 0;
2273 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2274 gtk, gtk_len);
2275 }
2276 pos = ieee80211w_kde_add(sm, pos);
2277
2278 #ifdef CONFIG_IEEE80211R
2279 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2280 int res;
2281 struct wpa_auth_config *conf;
2282
2283 conf = &sm->wpa_auth->conf;
2284 res = wpa_write_ftie(conf, conf->r0_key_holder,
2285 conf->r0_key_holder_len,
2286 NULL, NULL, pos, kde + kde_len - pos,
2287 NULL, 0);
2288 if (res < 0) {
2289 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
2290 "into EAPOL-Key Key Data");
2291 os_free(kde);
2292 return;
2293 }
2294 pos += res;
2295
2296 /* TIE[ReassociationDeadline] (TU) */
2297 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2298 *pos++ = 5;
2299 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
2300 WPA_PUT_LE32(pos, conf->reassociation_deadline);
2301 pos += 4;
2302
2303 /* TIE[KeyLifetime] (seconds) */
2304 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
2305 *pos++ = 5;
2306 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
2307 WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60);
2308 pos += 4;
2309 }
2310 #endif /* CONFIG_IEEE80211R */
2311 #ifdef CONFIG_P2P
2312 if (WPA_GET_BE32(sm->ip_addr) > 0) {
2313 u8 addr[3 * 4];
2314 os_memcpy(addr, sm->ip_addr, 4);
2315 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
2316 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
2317 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
2318 addr, sizeof(addr), NULL, 0);
2319 }
2320 #endif /* CONFIG_P2P */
2321
2322 wpa_send_eapol(sm->wpa_auth, sm,
2323 (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC |
2324 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
2325 WPA_KEY_INFO_KEY_TYPE,
2326 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
2327 os_free(kde);
2328 }
2329
2330
SM_STATE(WPA_PTK,PTKINITDONE)2331 SM_STATE(WPA_PTK, PTKINITDONE)
2332 {
2333 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
2334 sm->EAPOLKeyReceived = FALSE;
2335 if (sm->Pair) {
2336 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
2337 int klen = wpa_cipher_key_len(sm->pairwise);
2338 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2339 sm->PTK.tk, klen)) {
2340 wpa_sta_disconnect(sm->wpa_auth, sm->addr);
2341 return;
2342 }
2343 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
2344 sm->pairwise_set = TRUE;
2345
2346 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
2347 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
2348 eloop_register_timeout(sm->wpa_auth->conf.
2349 wpa_ptk_rekey, 0, wpa_rekey_ptk,
2350 sm->wpa_auth, sm);
2351 }
2352
2353 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2354 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2355 WPA_EAPOL_authorized, 1);
2356 }
2357 }
2358
2359 if (0 /* IBSS == TRUE */) {
2360 sm->keycount++;
2361 if (sm->keycount == 2) {
2362 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
2363 WPA_EAPOL_portValid, 1);
2364 }
2365 } else {
2366 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
2367 1);
2368 }
2369 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
2370 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
2371 if (sm->wpa == WPA_VERSION_WPA)
2372 sm->PInitAKeys = TRUE;
2373 else
2374 sm->has_GTK = TRUE;
2375 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2376 "pairwise key handshake completed (%s)",
2377 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2378
2379 #ifdef CONFIG_IEEE80211R
2380 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
2381 #endif /* CONFIG_IEEE80211R */
2382 }
2383
2384
SM_STEP(WPA_PTK)2385 SM_STEP(WPA_PTK)
2386 {
2387 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2388
2389 if (sm->Init)
2390 SM_ENTER(WPA_PTK, INITIALIZE);
2391 else if (sm->Disconnect
2392 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
2393 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
2394 "WPA_PTK: sm->Disconnect");
2395 SM_ENTER(WPA_PTK, DISCONNECT);
2396 }
2397 else if (sm->DeauthenticationRequest)
2398 SM_ENTER(WPA_PTK, DISCONNECTED);
2399 else if (sm->AuthenticationRequest)
2400 SM_ENTER(WPA_PTK, AUTHENTICATION);
2401 else if (sm->ReAuthenticationRequest)
2402 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2403 else if (sm->PTKRequest)
2404 SM_ENTER(WPA_PTK, PTKSTART);
2405 else switch (sm->wpa_ptk_state) {
2406 case WPA_PTK_INITIALIZE:
2407 break;
2408 case WPA_PTK_DISCONNECT:
2409 SM_ENTER(WPA_PTK, DISCONNECTED);
2410 break;
2411 case WPA_PTK_DISCONNECTED:
2412 SM_ENTER(WPA_PTK, INITIALIZE);
2413 break;
2414 case WPA_PTK_AUTHENTICATION:
2415 SM_ENTER(WPA_PTK, AUTHENTICATION2);
2416 break;
2417 case WPA_PTK_AUTHENTICATION2:
2418 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
2419 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2420 WPA_EAPOL_keyRun) > 0)
2421 SM_ENTER(WPA_PTK, INITPMK);
2422 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)
2423 /* FIX: && 802.1X::keyRun */)
2424 SM_ENTER(WPA_PTK, INITPSK);
2425 break;
2426 case WPA_PTK_INITPMK:
2427 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
2428 WPA_EAPOL_keyAvailable) > 0)
2429 SM_ENTER(WPA_PTK, PTKSTART);
2430 else {
2431 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2432 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2433 "INITPMK - keyAvailable = false");
2434 SM_ENTER(WPA_PTK, DISCONNECT);
2435 }
2436 break;
2437 case WPA_PTK_INITPSK:
2438 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
2439 NULL))
2440 SM_ENTER(WPA_PTK, PTKSTART);
2441 else {
2442 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2443 "no PSK configured for the STA");
2444 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2445 SM_ENTER(WPA_PTK, DISCONNECT);
2446 }
2447 break;
2448 case WPA_PTK_PTKSTART:
2449 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2450 sm->EAPOLKeyPairwise)
2451 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2452 else if (sm->TimeoutCtr >
2453 (int) dot11RSNAConfigPairwiseUpdateCount) {
2454 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2455 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2456 "PTKSTART: Retry limit %d reached",
2457 dot11RSNAConfigPairwiseUpdateCount);
2458 SM_ENTER(WPA_PTK, DISCONNECT);
2459 } else if (sm->TimeoutEvt)
2460 SM_ENTER(WPA_PTK, PTKSTART);
2461 break;
2462 case WPA_PTK_PTKCALCNEGOTIATING:
2463 if (sm->MICVerified)
2464 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
2465 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2466 sm->EAPOLKeyPairwise)
2467 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2468 else if (sm->TimeoutEvt)
2469 SM_ENTER(WPA_PTK, PTKSTART);
2470 break;
2471 case WPA_PTK_PTKCALCNEGOTIATING2:
2472 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2473 break;
2474 case WPA_PTK_PTKINITNEGOTIATING:
2475 if (sm->update_snonce)
2476 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
2477 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2478 sm->EAPOLKeyPairwise && sm->MICVerified)
2479 SM_ENTER(WPA_PTK, PTKINITDONE);
2480 else if (sm->TimeoutCtr >
2481 (int) dot11RSNAConfigPairwiseUpdateCount) {
2482 wpa_auth->dot11RSNA4WayHandshakeFailures++;
2483 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2484 "PTKINITNEGOTIATING: Retry limit %d "
2485 "reached",
2486 dot11RSNAConfigPairwiseUpdateCount);
2487 SM_ENTER(WPA_PTK, DISCONNECT);
2488 } else if (sm->TimeoutEvt)
2489 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
2490 break;
2491 case WPA_PTK_PTKINITDONE:
2492 break;
2493 }
2494 }
2495
2496
SM_STATE(WPA_PTK_GROUP,IDLE)2497 SM_STATE(WPA_PTK_GROUP, IDLE)
2498 {
2499 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
2500 if (sm->Init) {
2501 /* Init flag is not cleared here, so avoid busy
2502 * loop by claiming nothing changed. */
2503 sm->changed = FALSE;
2504 }
2505 sm->GTimeoutCtr = 0;
2506 }
2507
2508
SM_STATE(WPA_PTK_GROUP,REKEYNEGOTIATING)2509 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
2510 {
2511 u8 rsc[WPA_KEY_RSC_LEN];
2512 struct wpa_group *gsm = sm->group;
2513 const u8 *kde;
2514 u8 *kde_buf = NULL, *pos, hdr[2];
2515 size_t kde_len;
2516 u8 *gtk, dummy_gtk[32];
2517
2518 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
2519
2520 sm->GTimeoutCtr++;
2521 if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) {
2522 /* No point in sending the EAPOL-Key - we will disconnect
2523 * immediately following this. */
2524 return;
2525 }
2526
2527 if (sm->wpa == WPA_VERSION_WPA)
2528 sm->PInitAKeys = FALSE;
2529 sm->TimeoutEvt = FALSE;
2530 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
2531 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
2532 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
2533 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
2534 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2535 "sending 1/2 msg of Group Key Handshake");
2536
2537 gtk = gsm->GTK[gsm->GN - 1];
2538 if (sm->wpa_auth->conf.disable_gtk) {
2539 /*
2540 * Provide unique random GTK to each STA to prevent use
2541 * of GTK in the BSS.
2542 */
2543 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
2544 return;
2545 gtk = dummy_gtk;
2546 }
2547 if (sm->wpa == WPA_VERSION_WPA2) {
2548 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
2549 ieee80211w_kde_len(sm);
2550 kde_buf = os_malloc(kde_len);
2551 if (kde_buf == NULL)
2552 return;
2553
2554 kde = pos = kde_buf;
2555 hdr[0] = gsm->GN & 0x03;
2556 hdr[1] = 0;
2557 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2558 gtk, gsm->GTK_len);
2559 pos = ieee80211w_kde_add(sm, pos);
2560 kde_len = pos - kde;
2561 } else {
2562 kde = gtk;
2563 kde_len = gsm->GTK_len;
2564 }
2565
2566 wpa_send_eapol(sm->wpa_auth, sm,
2567 WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
2568 WPA_KEY_INFO_ACK |
2569 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
2570 rsc, gsm->GNonce, kde, kde_len, gsm->GN, 1);
2571
2572 os_free(kde_buf);
2573 }
2574
2575
SM_STATE(WPA_PTK_GROUP,REKEYESTABLISHED)2576 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
2577 {
2578 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
2579 sm->EAPOLKeyReceived = FALSE;
2580 if (sm->GUpdateStationKeys)
2581 sm->group->GKeyDoneStations--;
2582 sm->GUpdateStationKeys = FALSE;
2583 sm->GTimeoutCtr = 0;
2584 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
2585 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2586 "group key handshake completed (%s)",
2587 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
2588 sm->has_GTK = TRUE;
2589 }
2590
2591
SM_STATE(WPA_PTK_GROUP,KEYERROR)2592 SM_STATE(WPA_PTK_GROUP, KEYERROR)
2593 {
2594 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
2595 if (sm->GUpdateStationKeys)
2596 sm->group->GKeyDoneStations--;
2597 sm->GUpdateStationKeys = FALSE;
2598 sm->Disconnect = TRUE;
2599 }
2600
2601
SM_STEP(WPA_PTK_GROUP)2602 SM_STEP(WPA_PTK_GROUP)
2603 {
2604 if (sm->Init || sm->PtkGroupInit) {
2605 SM_ENTER(WPA_PTK_GROUP, IDLE);
2606 sm->PtkGroupInit = FALSE;
2607 } else switch (sm->wpa_ptk_group_state) {
2608 case WPA_PTK_GROUP_IDLE:
2609 if (sm->GUpdateStationKeys ||
2610 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
2611 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2612 break;
2613 case WPA_PTK_GROUP_REKEYNEGOTIATING:
2614 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
2615 !sm->EAPOLKeyPairwise && sm->MICVerified)
2616 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
2617 else if (sm->GTimeoutCtr >
2618 (int) dot11RSNAConfigGroupUpdateCount)
2619 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
2620 else if (sm->TimeoutEvt)
2621 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
2622 break;
2623 case WPA_PTK_GROUP_KEYERROR:
2624 SM_ENTER(WPA_PTK_GROUP, IDLE);
2625 break;
2626 case WPA_PTK_GROUP_REKEYESTABLISHED:
2627 SM_ENTER(WPA_PTK_GROUP, IDLE);
2628 break;
2629 }
2630 }
2631
2632
wpa_gtk_update(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2633 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
2634 struct wpa_group *group)
2635 {
2636 int ret = 0;
2637
2638 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2639 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2640 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
2641 wpa_auth->addr, group->GNonce,
2642 group->GTK[group->GN - 1], group->GTK_len) < 0)
2643 ret = -1;
2644 wpa_hexdump_key(MSG_DEBUG, "GTK",
2645 group->GTK[group->GN - 1], group->GTK_len);
2646
2647 #ifdef CONFIG_IEEE80211W
2648 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2649 size_t len;
2650 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2651 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
2652 inc_byte_array(group->Counter, WPA_NONCE_LEN);
2653 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
2654 wpa_auth->addr, group->GNonce,
2655 group->IGTK[group->GN_igtk - 4], len) < 0)
2656 ret = -1;
2657 wpa_hexdump_key(MSG_DEBUG, "IGTK",
2658 group->IGTK[group->GN_igtk - 4], len);
2659 }
2660 #endif /* CONFIG_IEEE80211W */
2661
2662 return ret;
2663 }
2664
2665
wpa_group_gtk_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2666 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
2667 struct wpa_group *group)
2668 {
2669 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2670 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
2671 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
2672 group->wpa_group_state = WPA_GROUP_GTK_INIT;
2673
2674 /* GTK[0..N] = 0 */
2675 os_memset(group->GTK, 0, sizeof(group->GTK));
2676 group->GN = 1;
2677 group->GM = 2;
2678 #ifdef CONFIG_IEEE80211W
2679 group->GN_igtk = 4;
2680 group->GM_igtk = 5;
2681 #endif /* CONFIG_IEEE80211W */
2682 /* GTK[GN] = CalcGTK() */
2683 wpa_gtk_update(wpa_auth, group);
2684 }
2685
2686
wpa_group_update_sta(struct wpa_state_machine * sm,void * ctx)2687 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
2688 {
2689 if (ctx != NULL && ctx != sm->group)
2690 return 0;
2691
2692 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
2693 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2694 "Not in PTKINITDONE; skip Group Key update");
2695 sm->GUpdateStationKeys = FALSE;
2696 return 0;
2697 }
2698 if (sm->GUpdateStationKeys) {
2699 /*
2700 * This should not really happen, so add a debug log entry.
2701 * Since we clear the GKeyDoneStations before the loop, the
2702 * station needs to be counted here anyway.
2703 */
2704 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2705 "GUpdateStationKeys was already set when "
2706 "marking station for GTK rekeying");
2707 }
2708
2709 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
2710 if (sm->is_wnmsleep)
2711 return 0;
2712
2713 sm->group->GKeyDoneStations++;
2714 sm->GUpdateStationKeys = TRUE;
2715
2716 wpa_sm_step(sm);
2717 return 0;
2718 }
2719
2720
2721 #ifdef CONFIG_WNM
2722 /* update GTK when exiting WNM-Sleep Mode */
wpa_wnmsleep_rekey_gtk(struct wpa_state_machine * sm)2723 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
2724 {
2725 if (sm == NULL || sm->is_wnmsleep)
2726 return;
2727
2728 wpa_group_update_sta(sm, NULL);
2729 }
2730
2731
wpa_set_wnmsleep(struct wpa_state_machine * sm,int flag)2732 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
2733 {
2734 if (sm)
2735 sm->is_wnmsleep = !!flag;
2736 }
2737
2738
wpa_wnmsleep_gtk_subelem(struct wpa_state_machine * sm,u8 * pos)2739 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2740 {
2741 struct wpa_group *gsm = sm->group;
2742 u8 *start = pos;
2743
2744 /*
2745 * GTK subelement:
2746 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
2747 * Key[5..32]
2748 */
2749 *pos++ = WNM_SLEEP_SUBELEM_GTK;
2750 *pos++ = 11 + gsm->GTK_len;
2751 /* Key ID in B0-B1 of Key Info */
2752 WPA_PUT_LE16(pos, gsm->GN & 0x03);
2753 pos += 2;
2754 *pos++ = gsm->GTK_len;
2755 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
2756 return 0;
2757 pos += 8;
2758 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2759 pos += gsm->GTK_len;
2760
2761 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
2762 gsm->GN);
2763 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
2764 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
2765
2766 return pos - start;
2767 }
2768
2769
2770 #ifdef CONFIG_IEEE80211W
wpa_wnmsleep_igtk_subelem(struct wpa_state_machine * sm,u8 * pos)2771 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
2772 {
2773 struct wpa_group *gsm = sm->group;
2774 u8 *start = pos;
2775 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2776
2777 /*
2778 * IGTK subelement:
2779 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
2780 */
2781 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
2782 *pos++ = 2 + 6 + len;
2783 WPA_PUT_LE16(pos, gsm->GN_igtk);
2784 pos += 2;
2785 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
2786 return 0;
2787 pos += 6;
2788
2789 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
2790 pos += len;
2791
2792 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
2793 gsm->GN_igtk);
2794 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
2795 gsm->IGTK[gsm->GN_igtk - 4], len);
2796
2797 return pos - start;
2798 }
2799 #endif /* CONFIG_IEEE80211W */
2800 #endif /* CONFIG_WNM */
2801
2802
wpa_group_setkeys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2803 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
2804 struct wpa_group *group)
2805 {
2806 int tmp;
2807
2808 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2809 "SETKEYS (VLAN-ID %d)", group->vlan_id);
2810 group->changed = TRUE;
2811 group->wpa_group_state = WPA_GROUP_SETKEYS;
2812 group->GTKReKey = FALSE;
2813 tmp = group->GM;
2814 group->GM = group->GN;
2815 group->GN = tmp;
2816 #ifdef CONFIG_IEEE80211W
2817 tmp = group->GM_igtk;
2818 group->GM_igtk = group->GN_igtk;
2819 group->GN_igtk = tmp;
2820 #endif /* CONFIG_IEEE80211W */
2821 /* "GKeyDoneStations = GNoStations" is done in more robust way by
2822 * counting the STAs that are marked with GUpdateStationKeys instead of
2823 * including all STAs that could be in not-yet-completed state. */
2824 wpa_gtk_update(wpa_auth, group);
2825
2826 if (group->GKeyDoneStations) {
2827 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
2828 "GKeyDoneStations=%d when starting new GTK rekey",
2829 group->GKeyDoneStations);
2830 group->GKeyDoneStations = 0;
2831 }
2832 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
2833 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
2834 group->GKeyDoneStations);
2835 }
2836
2837
wpa_group_config_group_keys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2838 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
2839 struct wpa_group *group)
2840 {
2841 int ret = 0;
2842
2843 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
2844 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
2845 broadcast_ether_addr, group->GN,
2846 group->GTK[group->GN - 1], group->GTK_len) < 0)
2847 ret = -1;
2848
2849 #ifdef CONFIG_IEEE80211W
2850 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
2851 enum wpa_alg alg;
2852 size_t len;
2853
2854 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
2855 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
2856
2857 if (ret == 0 &&
2858 wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
2859 broadcast_ether_addr, group->GN_igtk,
2860 group->IGTK[group->GN_igtk - 4], len) < 0)
2861 ret = -1;
2862 }
2863 #endif /* CONFIG_IEEE80211W */
2864
2865 return ret;
2866 }
2867
2868
wpa_group_disconnect_cb(struct wpa_state_machine * sm,void * ctx)2869 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
2870 {
2871 if (sm->group == ctx) {
2872 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
2873 " for discconnection due to fatal failure",
2874 MAC2STR(sm->addr));
2875 sm->Disconnect = TRUE;
2876 }
2877
2878 return 0;
2879 }
2880
2881
wpa_group_fatal_failure(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2882 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
2883 struct wpa_group *group)
2884 {
2885 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
2886 group->changed = TRUE;
2887 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
2888 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
2889 }
2890
2891
wpa_group_setkeysdone(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2892 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
2893 struct wpa_group *group)
2894 {
2895 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
2896 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
2897 group->changed = TRUE;
2898 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
2899
2900 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
2901 wpa_group_fatal_failure(wpa_auth, group);
2902 return -1;
2903 }
2904
2905 return 0;
2906 }
2907
2908
wpa_group_sm_step(struct wpa_authenticator * wpa_auth,struct wpa_group * group)2909 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
2910 struct wpa_group *group)
2911 {
2912 if (group->GInit) {
2913 wpa_group_gtk_init(wpa_auth, group);
2914 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
2915 /* Do not allow group operations */
2916 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
2917 group->GTKAuthenticator) {
2918 wpa_group_setkeysdone(wpa_auth, group);
2919 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
2920 group->GTKReKey) {
2921 wpa_group_setkeys(wpa_auth, group);
2922 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
2923 if (group->GKeyDoneStations == 0)
2924 wpa_group_setkeysdone(wpa_auth, group);
2925 else if (group->GTKReKey)
2926 wpa_group_setkeys(wpa_auth, group);
2927 }
2928 }
2929
2930
wpa_sm_step(struct wpa_state_machine * sm)2931 static int wpa_sm_step(struct wpa_state_machine *sm)
2932 {
2933 if (sm == NULL)
2934 return 0;
2935
2936 if (sm->in_step_loop) {
2937 /* This should not happen, but if it does, make sure we do not
2938 * end up freeing the state machine too early by exiting the
2939 * recursive call. */
2940 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
2941 return 0;
2942 }
2943
2944 sm->in_step_loop = 1;
2945 do {
2946 if (sm->pending_deinit)
2947 break;
2948
2949 sm->changed = FALSE;
2950 sm->wpa_auth->group->changed = FALSE;
2951
2952 SM_STEP_RUN(WPA_PTK);
2953 if (sm->pending_deinit)
2954 break;
2955 SM_STEP_RUN(WPA_PTK_GROUP);
2956 if (sm->pending_deinit)
2957 break;
2958 wpa_group_sm_step(sm->wpa_auth, sm->group);
2959 } while (sm->changed || sm->wpa_auth->group->changed);
2960 sm->in_step_loop = 0;
2961
2962 if (sm->pending_deinit) {
2963 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
2964 "machine deinit for " MACSTR, MAC2STR(sm->addr));
2965 wpa_free_sta_sm(sm);
2966 return 1;
2967 }
2968 return 0;
2969 }
2970
2971
wpa_sm_call_step(void * eloop_ctx,void * timeout_ctx)2972 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
2973 {
2974 struct wpa_state_machine *sm = eloop_ctx;
2975 wpa_sm_step(sm);
2976 }
2977
2978
wpa_auth_sm_notify(struct wpa_state_machine * sm)2979 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
2980 {
2981 if (sm == NULL)
2982 return;
2983 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
2984 }
2985
2986
wpa_gtk_rekey(struct wpa_authenticator * wpa_auth)2987 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
2988 {
2989 int tmp, i;
2990 struct wpa_group *group;
2991
2992 if (wpa_auth == NULL)
2993 return;
2994
2995 group = wpa_auth->group;
2996
2997 for (i = 0; i < 2; i++) {
2998 tmp = group->GM;
2999 group->GM = group->GN;
3000 group->GN = tmp;
3001 #ifdef CONFIG_IEEE80211W
3002 tmp = group->GM_igtk;
3003 group->GM_igtk = group->GN_igtk;
3004 group->GN_igtk = tmp;
3005 #endif /* CONFIG_IEEE80211W */
3006 wpa_gtk_update(wpa_auth, group);
3007 wpa_group_config_group_keys(wpa_auth, group);
3008 }
3009 }
3010
3011
wpa_bool_txt(int val)3012 static const char * wpa_bool_txt(int val)
3013 {
3014 return val ? "TRUE" : "FALSE";
3015 }
3016
3017
3018 #define RSN_SUITE "%02x-%02x-%02x-%d"
3019 #define RSN_SUITE_ARG(s) \
3020 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
3021
wpa_get_mib(struct wpa_authenticator * wpa_auth,char * buf,size_t buflen)3022 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
3023 {
3024 int len = 0, ret;
3025 char pmkid_txt[PMKID_LEN * 2 + 1];
3026 #ifdef CONFIG_RSN_PREAUTH
3027 const int preauth = 1;
3028 #else /* CONFIG_RSN_PREAUTH */
3029 const int preauth = 0;
3030 #endif /* CONFIG_RSN_PREAUTH */
3031
3032 if (wpa_auth == NULL)
3033 return len;
3034
3035 ret = os_snprintf(buf + len, buflen - len,
3036 "dot11RSNAOptionImplemented=TRUE\n"
3037 "dot11RSNAPreauthenticationImplemented=%s\n"
3038 "dot11RSNAEnabled=%s\n"
3039 "dot11RSNAPreauthenticationEnabled=%s\n",
3040 wpa_bool_txt(preauth),
3041 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
3042 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
3043 if (os_snprintf_error(buflen - len, ret))
3044 return len;
3045 len += ret;
3046
3047 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
3048 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
3049
3050 ret = os_snprintf(
3051 buf + len, buflen - len,
3052 "dot11RSNAConfigVersion=%u\n"
3053 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
3054 /* FIX: dot11RSNAConfigGroupCipher */
3055 /* FIX: dot11RSNAConfigGroupRekeyMethod */
3056 /* FIX: dot11RSNAConfigGroupRekeyTime */
3057 /* FIX: dot11RSNAConfigGroupRekeyPackets */
3058 "dot11RSNAConfigGroupRekeyStrict=%u\n"
3059 "dot11RSNAConfigGroupUpdateCount=%u\n"
3060 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
3061 "dot11RSNAConfigGroupCipherSize=%u\n"
3062 "dot11RSNAConfigPMKLifetime=%u\n"
3063 "dot11RSNAConfigPMKReauthThreshold=%u\n"
3064 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
3065 "dot11RSNAConfigSATimeout=%u\n"
3066 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
3067 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
3068 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
3069 "dot11RSNAPMKIDUsed=%s\n"
3070 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
3071 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
3072 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
3073 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
3074 "dot11RSNA4WayHandshakeFailures=%u\n"
3075 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
3076 RSN_VERSION,
3077 !!wpa_auth->conf.wpa_strict_rekey,
3078 dot11RSNAConfigGroupUpdateCount,
3079 dot11RSNAConfigPairwiseUpdateCount,
3080 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
3081 dot11RSNAConfigPMKLifetime,
3082 dot11RSNAConfigPMKReauthThreshold,
3083 dot11RSNAConfigSATimeout,
3084 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
3085 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
3086 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
3087 pmkid_txt,
3088 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
3089 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
3090 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
3091 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
3092 wpa_auth->dot11RSNA4WayHandshakeFailures);
3093 if (os_snprintf_error(buflen - len, ret))
3094 return len;
3095 len += ret;
3096
3097 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
3098 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
3099
3100 /* Private MIB */
3101 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
3102 wpa_auth->group->wpa_group_state);
3103 if (os_snprintf_error(buflen - len, ret))
3104 return len;
3105 len += ret;
3106
3107 return len;
3108 }
3109
3110
wpa_get_mib_sta(struct wpa_state_machine * sm,char * buf,size_t buflen)3111 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
3112 {
3113 int len = 0, ret;
3114 u32 pairwise = 0;
3115
3116 if (sm == NULL)
3117 return 0;
3118
3119 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
3120
3121 /* dot11RSNAStatsEntry */
3122
3123 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
3124 WPA_PROTO_RSN : WPA_PROTO_WPA,
3125 sm->pairwise);
3126 if (pairwise == 0)
3127 return 0;
3128
3129 ret = os_snprintf(
3130 buf + len, buflen - len,
3131 /* TODO: dot11RSNAStatsIndex */
3132 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
3133 "dot11RSNAStatsVersion=1\n"
3134 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
3135 /* TODO: dot11RSNAStatsTKIPICVErrors */
3136 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
3137 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
3138 /* TODO: dot11RSNAStatsCCMPReplays */
3139 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
3140 /* TODO: dot11RSNAStatsTKIPReplays */,
3141 MAC2STR(sm->addr),
3142 RSN_SUITE_ARG(pairwise),
3143 sm->dot11RSNAStatsTKIPLocalMICFailures,
3144 sm->dot11RSNAStatsTKIPRemoteMICFailures);
3145 if (os_snprintf_error(buflen - len, ret))
3146 return len;
3147 len += ret;
3148
3149 /* Private MIB */
3150 ret = os_snprintf(buf + len, buflen - len,
3151 "hostapdWPAPTKState=%d\n"
3152 "hostapdWPAPTKGroupState=%d\n",
3153 sm->wpa_ptk_state,
3154 sm->wpa_ptk_group_state);
3155 if (os_snprintf_error(buflen - len, ret))
3156 return len;
3157 len += ret;
3158
3159 return len;
3160 }
3161
3162
wpa_auth_countermeasures_start(struct wpa_authenticator * wpa_auth)3163 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
3164 {
3165 if (wpa_auth)
3166 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
3167 }
3168
3169
wpa_auth_pairwise_set(struct wpa_state_machine * sm)3170 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
3171 {
3172 return sm && sm->pairwise_set;
3173 }
3174
3175
wpa_auth_get_pairwise(struct wpa_state_machine * sm)3176 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
3177 {
3178 return sm->pairwise;
3179 }
3180
3181
wpa_auth_sta_key_mgmt(struct wpa_state_machine * sm)3182 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
3183 {
3184 if (sm == NULL)
3185 return -1;
3186 return sm->wpa_key_mgmt;
3187 }
3188
3189
wpa_auth_sta_wpa_version(struct wpa_state_machine * sm)3190 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
3191 {
3192 if (sm == NULL)
3193 return 0;
3194 return sm->wpa;
3195 }
3196
3197
wpa_auth_sta_clear_pmksa(struct wpa_state_machine * sm,struct rsn_pmksa_cache_entry * entry)3198 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
3199 struct rsn_pmksa_cache_entry *entry)
3200 {
3201 if (sm == NULL || sm->pmksa != entry)
3202 return -1;
3203 sm->pmksa = NULL;
3204 return 0;
3205 }
3206
3207
3208 struct rsn_pmksa_cache_entry *
wpa_auth_sta_get_pmksa(struct wpa_state_machine * sm)3209 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
3210 {
3211 return sm ? sm->pmksa : NULL;
3212 }
3213
3214
wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine * sm)3215 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
3216 {
3217 if (sm)
3218 sm->dot11RSNAStatsTKIPLocalMICFailures++;
3219 }
3220
3221
wpa_auth_get_wpa_ie(struct wpa_authenticator * wpa_auth,size_t * len)3222 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
3223 {
3224 if (wpa_auth == NULL)
3225 return NULL;
3226 *len = wpa_auth->wpa_ie_len;
3227 return wpa_auth->wpa_ie;
3228 }
3229
3230
wpa_auth_pmksa_add(struct wpa_state_machine * sm,const u8 * pmk,int session_timeout,struct eapol_state_machine * eapol)3231 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
3232 int session_timeout, struct eapol_state_machine *eapol)
3233 {
3234 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
3235 sm->wpa_auth->conf.disable_pmksa_caching)
3236 return -1;
3237
3238 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN,
3239 sm->PTK.kck, sm->PTK.kck_len,
3240 sm->wpa_auth->addr, sm->addr, session_timeout,
3241 eapol, sm->wpa_key_mgmt))
3242 return 0;
3243
3244 return -1;
3245 }
3246
3247
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)3248 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
3249 const u8 *pmk, size_t len, const u8 *sta_addr,
3250 int session_timeout,
3251 struct eapol_state_machine *eapol)
3252 {
3253 if (wpa_auth == NULL)
3254 return -1;
3255
3256 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len,
3257 NULL, 0,
3258 wpa_auth->addr,
3259 sta_addr, session_timeout, eapol,
3260 WPA_KEY_MGMT_IEEE8021X))
3261 return 0;
3262
3263 return -1;
3264 }
3265
3266
wpa_auth_pmksa_add_sae(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * pmk)3267 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr,
3268 const u8 *pmk)
3269 {
3270 if (wpa_auth->conf.disable_pmksa_caching)
3271 return -1;
3272
3273 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN,
3274 NULL, 0,
3275 wpa_auth->addr, addr, 0, NULL,
3276 WPA_KEY_MGMT_SAE))
3277 return 0;
3278
3279 return -1;
3280 }
3281
3282
wpa_auth_pmksa_remove(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)3283 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
3284 const u8 *sta_addr)
3285 {
3286 struct rsn_pmksa_cache_entry *pmksa;
3287
3288 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
3289 return;
3290 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
3291 if (pmksa) {
3292 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
3293 MACSTR " based on request", MAC2STR(sta_addr));
3294 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
3295 }
3296 }
3297
3298
3299 /*
3300 * Remove and free the group from wpa_authenticator. This is triggered by a
3301 * callback to make sure nobody is currently iterating the group list while it
3302 * gets modified.
3303 */
wpa_group_free(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3304 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
3305 struct wpa_group *group)
3306 {
3307 struct wpa_group *prev = wpa_auth->group;
3308
3309 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d",
3310 group->vlan_id);
3311
3312 while (prev) {
3313 if (prev->next == group) {
3314 /* This never frees the special first group as needed */
3315 prev->next = group->next;
3316 os_free(group);
3317 break;
3318 }
3319 prev = prev->next;
3320 }
3321
3322 }
3323
3324
3325 /* Increase the reference counter for group */
wpa_group_get(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3326 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
3327 struct wpa_group *group)
3328 {
3329 /* Skip the special first group */
3330 if (wpa_auth->group == group)
3331 return;
3332
3333 group->references++;
3334 }
3335
3336
3337 /* Decrease the reference counter and maybe free the group */
wpa_group_put(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3338 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
3339 struct wpa_group *group)
3340 {
3341 /* Skip the special first group */
3342 if (wpa_auth->group == group)
3343 return;
3344
3345 group->references--;
3346 if (group->references)
3347 return;
3348 wpa_group_free(wpa_auth, group);
3349 }
3350
3351
3352 /*
3353 * Add a group that has its references counter set to zero. Caller needs to
3354 * call wpa_group_get() on the return value to mark the entry in use.
3355 */
3356 static struct wpa_group *
wpa_auth_add_group(struct wpa_authenticator * wpa_auth,int vlan_id)3357 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
3358 {
3359 struct wpa_group *group;
3360
3361 if (wpa_auth == NULL || wpa_auth->group == NULL)
3362 return NULL;
3363
3364 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
3365 vlan_id);
3366 group = wpa_group_init(wpa_auth, vlan_id, 0);
3367 if (group == NULL)
3368 return NULL;
3369
3370 group->next = wpa_auth->group->next;
3371 wpa_auth->group->next = group;
3372
3373 return group;
3374 }
3375
3376
wpa_auth_sta_set_vlan(struct wpa_state_machine * sm,int vlan_id)3377 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
3378 {
3379 struct wpa_group *group;
3380
3381 if (sm == NULL || sm->wpa_auth == NULL)
3382 return 0;
3383
3384 group = sm->wpa_auth->group;
3385 while (group) {
3386 if (group->vlan_id == vlan_id)
3387 break;
3388 group = group->next;
3389 }
3390
3391 if (group == NULL) {
3392 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
3393 if (group == NULL)
3394 return -1;
3395 }
3396
3397 if (sm->group == group)
3398 return 0;
3399
3400 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
3401 return -1;
3402
3403 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
3404 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
3405
3406 wpa_group_get(sm->wpa_auth, group);
3407 wpa_group_put(sm->wpa_auth, sm->group);
3408 sm->group = group;
3409
3410 return 0;
3411 }
3412
3413
wpa_auth_eapol_key_tx_status(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int ack)3414 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
3415 struct wpa_state_machine *sm, int ack)
3416 {
3417 if (wpa_auth == NULL || sm == NULL)
3418 return;
3419 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
3420 " ack=%d", MAC2STR(sm->addr), ack);
3421 if (sm->pending_1_of_4_timeout && ack) {
3422 /*
3423 * Some deployed supplicant implementations update their SNonce
3424 * for each EAPOL-Key 2/4 message even within the same 4-way
3425 * handshake and then fail to use the first SNonce when
3426 * deriving the PTK. This results in unsuccessful 4-way
3427 * handshake whenever the relatively short initial timeout is
3428 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
3429 * around this by increasing the timeout now that we know that
3430 * the station has received the frame.
3431 */
3432 int timeout_ms = eapol_key_timeout_subseq;
3433 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
3434 "timeout by %u ms because of acknowledged frame",
3435 timeout_ms);
3436 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
3437 eloop_register_timeout(timeout_ms / 1000,
3438 (timeout_ms % 1000) * 1000,
3439 wpa_send_eapol_timeout, wpa_auth, sm);
3440 }
3441 }
3442
3443
wpa_auth_uses_sae(struct wpa_state_machine * sm)3444 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
3445 {
3446 if (sm == NULL)
3447 return 0;
3448 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
3449 }
3450
3451
wpa_auth_uses_ft_sae(struct wpa_state_machine * sm)3452 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
3453 {
3454 if (sm == NULL)
3455 return 0;
3456 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
3457 }
3458
3459
3460 #ifdef CONFIG_P2P
wpa_auth_get_ip_addr(struct wpa_state_machine * sm,u8 * addr)3461 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
3462 {
3463 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
3464 return -1;
3465 os_memcpy(addr, sm->ip_addr, 4);
3466 return 0;
3467 }
3468 #endif /* CONFIG_P2P */
3469
3470
wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator * wpa_auth,struct radius_das_attrs * attr)3471 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth,
3472 struct radius_das_attrs *attr)
3473 {
3474 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr);
3475 }
3476
3477
wpa_auth_reconfig_group_keys(struct wpa_authenticator * wpa_auth)3478 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth)
3479 {
3480 struct wpa_group *group;
3481
3482 if (!wpa_auth)
3483 return;
3484 for (group = wpa_auth->group; group; group = group->next)
3485 wpa_group_config_group_keys(wpa_auth, group);
3486 }
3487