1 /*
2 * IEEE 802.11 RSN / WPA Authenticator
3 * Copyright (c) 2004-2019, 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 "common/ocv.h"
17 #include "crypto/aes.h"
18 #include "crypto/aes_wrap.h"
19 #include "crypto/aes_siv.h"
20 #include "crypto/crypto.h"
21 #include "crypto/sha1.h"
22 #include "crypto/sha256.h"
23 #include "crypto/sha384.h"
24 #include "crypto/random.h"
25 #include "eapol_auth/eapol_auth_sm.h"
26 #include "drivers/driver.h"
27 #include "ap_config.h"
28 #include "ieee802_11.h"
29 #include "wpa_auth.h"
30 #include "pmksa_cache_auth.h"
31 #include "wpa_auth_i.h"
32 #include "wpa_auth_ie.h"
33
34 #define STATE_MACHINE_DATA struct wpa_state_machine
35 #define STATE_MACHINE_DEBUG_PREFIX "WPA"
36 #define STATE_MACHINE_ADDR sm->addr
37
38
39 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx);
40 static int wpa_sm_step(struct wpa_state_machine *sm);
41 static int wpa_verify_key_mic(int akmp, size_t pmk_len, struct wpa_ptk *PTK,
42 u8 *data, size_t data_len);
43 #ifdef CONFIG_FILS
44 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
45 u8 *buf, size_t buf_len, u16 *_key_data_len);
46 static struct wpabuf * fils_prepare_plainbuf(struct wpa_state_machine *sm,
47 const struct wpabuf *hlp);
48 #endif /* CONFIG_FILS */
49 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx);
50 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
51 struct wpa_group *group);
52 static void wpa_request_new_ptk(struct wpa_state_machine *sm);
53 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
54 struct wpa_group *group);
55 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
56 struct wpa_group *group);
57 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
58 const u8 *pmk, unsigned int pmk_len,
59 struct wpa_ptk *ptk);
60 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
61 struct wpa_group *group);
62 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
63 struct wpa_group *group);
64 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
65 struct wpa_group *group);
66 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos);
67
68 static const u32 eapol_key_timeout_first = 100; /* ms */
69 static const u32 eapol_key_timeout_subseq = 1000; /* ms */
70 static const u32 eapol_key_timeout_first_group = 500; /* ms */
71 static const u32 eapol_key_timeout_no_retrans = 4000; /* ms */
72
73 /* TODO: make these configurable */
74 static const int dot11RSNAConfigPMKLifetime = 43200;
75 static const int dot11RSNAConfigPMKReauthThreshold = 70;
76 static const int dot11RSNAConfigSATimeout = 60;
77
78
wpa_auth_mic_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)79 static inline int wpa_auth_mic_failure_report(
80 struct wpa_authenticator *wpa_auth, const u8 *addr)
81 {
82 if (wpa_auth->cb->mic_failure_report)
83 return wpa_auth->cb->mic_failure_report(wpa_auth->cb_ctx, addr);
84 return 0;
85 }
86
87
wpa_auth_psk_failure_report(struct wpa_authenticator * wpa_auth,const u8 * addr)88 static inline void wpa_auth_psk_failure_report(
89 struct wpa_authenticator *wpa_auth, const u8 *addr)
90 {
91 if (wpa_auth->cb->psk_failure_report)
92 wpa_auth->cb->psk_failure_report(wpa_auth->cb_ctx, addr);
93 }
94
95
wpa_auth_set_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var,int value)96 static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth,
97 const u8 *addr, wpa_eapol_variable var,
98 int value)
99 {
100 if (wpa_auth->cb->set_eapol)
101 wpa_auth->cb->set_eapol(wpa_auth->cb_ctx, addr, var, value);
102 }
103
104
wpa_auth_get_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,wpa_eapol_variable var)105 static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth,
106 const u8 *addr, wpa_eapol_variable var)
107 {
108 if (wpa_auth->cb->get_eapol == NULL)
109 return -1;
110 return wpa_auth->cb->get_eapol(wpa_auth->cb_ctx, addr, var);
111 }
112
113
wpa_auth_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk,size_t * psk_len,int * vlan_id)114 static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth,
115 const u8 *addr,
116 const u8 *p2p_dev_addr,
117 const u8 *prev_psk, size_t *psk_len,
118 int *vlan_id)
119 {
120 if (wpa_auth->cb->get_psk == NULL)
121 return NULL;
122 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
123 prev_psk, psk_len, vlan_id);
124 }
125
126
wpa_auth_get_msk(struct wpa_authenticator * wpa_auth,const u8 * addr,u8 * msk,size_t * len)127 static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth,
128 const u8 *addr, u8 *msk, size_t *len)
129 {
130 if (wpa_auth->cb->get_msk == NULL)
131 return -1;
132 return wpa_auth->cb->get_msk(wpa_auth->cb_ctx, addr, msk, len);
133 }
134
135
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)136 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
137 int vlan_id,
138 enum wpa_alg alg, const u8 *addr, int idx,
139 u8 *key, size_t key_len)
140 {
141 if (wpa_auth->cb->set_key == NULL)
142 return -1;
143 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
144 key, key_len);
145 }
146
147
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)148 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
149 const u8 *addr, int idx, u8 *seq)
150 {
151 if (wpa_auth->cb->get_seqnum == NULL)
152 return -1;
153 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
154 }
155
156
157 static inline int
wpa_auth_send_eapol(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * data,size_t data_len,int encrypt)158 wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr,
159 const u8 *data, size_t data_len, int encrypt)
160 {
161 if (wpa_auth->cb->send_eapol == NULL)
162 return -1;
163 return wpa_auth->cb->send_eapol(wpa_auth->cb_ctx, addr, data, data_len,
164 encrypt);
165 }
166
167
168 #ifdef CONFIG_MESH
wpa_auth_start_ampe(struct wpa_authenticator * wpa_auth,const u8 * addr)169 static inline int wpa_auth_start_ampe(struct wpa_authenticator *wpa_auth,
170 const u8 *addr)
171 {
172 if (wpa_auth->cb->start_ampe == NULL)
173 return -1;
174 return wpa_auth->cb->start_ampe(wpa_auth->cb_ctx, addr);
175 }
176 #endif /* CONFIG_MESH */
177
178
wpa_auth_for_each_sta(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_state_machine * sm,void * ctx),void * cb_ctx)179 int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth,
180 int (*cb)(struct wpa_state_machine *sm, void *ctx),
181 void *cb_ctx)
182 {
183 if (wpa_auth->cb->for_each_sta == NULL)
184 return 0;
185 return wpa_auth->cb->for_each_sta(wpa_auth->cb_ctx, cb, cb_ctx);
186 }
187
188
wpa_auth_for_each_auth(struct wpa_authenticator * wpa_auth,int (* cb)(struct wpa_authenticator * a,void * ctx),void * cb_ctx)189 int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth,
190 int (*cb)(struct wpa_authenticator *a, void *ctx),
191 void *cb_ctx)
192 {
193 if (wpa_auth->cb->for_each_auth == NULL)
194 return 0;
195 return wpa_auth->cb->for_each_auth(wpa_auth->cb_ctx, cb, cb_ctx);
196 }
197
198
wpa_auth_logger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * txt)199 void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr,
200 logger_level level, const char *txt)
201 {
202 if (wpa_auth->cb->logger == NULL)
203 return;
204 wpa_auth->cb->logger(wpa_auth->cb_ctx, addr, level, txt);
205 }
206
207
wpa_auth_vlogger(struct wpa_authenticator * wpa_auth,const u8 * addr,logger_level level,const char * fmt,...)208 void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr,
209 logger_level level, const char *fmt, ...)
210 {
211 char *format;
212 int maxlen;
213 va_list ap;
214
215 if (wpa_auth->cb->logger == NULL)
216 return;
217
218 maxlen = os_strlen(fmt) + 100;
219 format = os_malloc(maxlen);
220 if (!format)
221 return;
222
223 va_start(ap, fmt);
224 vsnprintf(format, maxlen, fmt, ap);
225 va_end(ap);
226
227 wpa_auth_logger(wpa_auth, addr, level, format);
228
229 os_free(format);
230 }
231
232
wpa_sta_disconnect(struct wpa_authenticator * wpa_auth,const u8 * addr,u16 reason)233 static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth,
234 const u8 *addr, u16 reason)
235 {
236 if (wpa_auth->cb->disconnect == NULL)
237 return;
238 wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR " (reason %u)",
239 MAC2STR(addr), reason);
240 wpa_auth->cb->disconnect(wpa_auth->cb_ctx, addr, reason);
241 }
242
243
244 #ifdef CONFIG_OCV
wpa_channel_info(struct wpa_authenticator * wpa_auth,struct wpa_channel_info * ci)245 static int wpa_channel_info(struct wpa_authenticator *wpa_auth,
246 struct wpa_channel_info *ci)
247 {
248 if (!wpa_auth->cb->channel_info)
249 return -1;
250 return wpa_auth->cb->channel_info(wpa_auth->cb_ctx, ci);
251 }
252 #endif /* CONFIG_OCV */
253
254
wpa_auth_update_vlan(struct wpa_authenticator * wpa_auth,const u8 * addr,int vlan_id)255 static int wpa_auth_update_vlan(struct wpa_authenticator *wpa_auth,
256 const u8 *addr, int vlan_id)
257 {
258 if (!wpa_auth->cb->update_vlan)
259 return -1;
260 return wpa_auth->cb->update_vlan(wpa_auth->cb_ctx, addr, vlan_id);
261 }
262
263
wpa_rekey_gmk(void * eloop_ctx,void * timeout_ctx)264 static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx)
265 {
266 struct wpa_authenticator *wpa_auth = eloop_ctx;
267
268 if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) {
269 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
270 "initialization.");
271 } else {
272 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd");
273 wpa_hexdump_key(MSG_DEBUG, "GMK",
274 wpa_auth->group->GMK, WPA_GMK_LEN);
275 }
276
277 if (wpa_auth->conf.wpa_gmk_rekey) {
278 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
279 wpa_rekey_gmk, wpa_auth, NULL);
280 }
281 }
282
283
wpa_rekey_gtk(void * eloop_ctx,void * timeout_ctx)284 static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx)
285 {
286 struct wpa_authenticator *wpa_auth = eloop_ctx;
287 struct wpa_group *group, *next;
288
289 wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK");
290 group = wpa_auth->group;
291 while (group) {
292 wpa_group_get(wpa_auth, group);
293
294 group->GTKReKey = TRUE;
295 do {
296 group->changed = FALSE;
297 wpa_group_sm_step(wpa_auth, group);
298 } while (group->changed);
299
300 next = group->next;
301 wpa_group_put(wpa_auth, group);
302 group = next;
303 }
304
305 if (wpa_auth->conf.wpa_group_rekey) {
306 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey,
307 0, wpa_rekey_gtk, wpa_auth, NULL);
308 }
309 }
310
311
wpa_rekey_ptk(void * eloop_ctx,void * timeout_ctx)312 static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx)
313 {
314 struct wpa_authenticator *wpa_auth = eloop_ctx;
315 struct wpa_state_machine *sm = timeout_ctx;
316
317 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK");
318 wpa_request_new_ptk(sm);
319 wpa_sm_step(sm);
320 }
321
322
wpa_auth_pmksa_clear_cb(struct wpa_state_machine * sm,void * ctx)323 static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx)
324 {
325 if (sm->pmksa == ctx)
326 sm->pmksa = NULL;
327 return 0;
328 }
329
330
wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry * entry,void * ctx)331 static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry,
332 void *ctx)
333 {
334 struct wpa_authenticator *wpa_auth = ctx;
335 wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry);
336 }
337
338
wpa_group_init_gmk_and_counter(struct wpa_authenticator * wpa_auth,struct wpa_group * group)339 static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth,
340 struct wpa_group *group)
341 {
342 u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)];
343 u8 rkey[32];
344 unsigned long ptr;
345
346 if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0)
347 return -1;
348 wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN);
349
350 /*
351 * Counter = PRF-256(Random number, "Init Counter",
352 * Local MAC Address || Time)
353 */
354 os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
355 wpa_get_ntp_timestamp(buf + ETH_ALEN);
356 ptr = (unsigned long) group;
357 os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr));
358 #ifdef TEST_FUZZ
359 os_memset(buf + ETH_ALEN, 0xab, 8);
360 os_memset(buf + ETH_ALEN + 8, 0xcd, sizeof(ptr));
361 #endif /* TEST_FUZZ */
362 if (random_get_bytes(rkey, sizeof(rkey)) < 0)
363 return -1;
364
365 if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf),
366 group->Counter, WPA_NONCE_LEN) < 0)
367 return -1;
368 wpa_hexdump_key(MSG_DEBUG, "Key Counter",
369 group->Counter, WPA_NONCE_LEN);
370
371 return 0;
372 }
373
374
wpa_group_init(struct wpa_authenticator * wpa_auth,int vlan_id,int delay_init)375 static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth,
376 int vlan_id, int delay_init)
377 {
378 struct wpa_group *group;
379
380 group = os_zalloc(sizeof(struct wpa_group));
381 if (group == NULL)
382 return NULL;
383
384 group->GTKAuthenticator = TRUE;
385 group->vlan_id = vlan_id;
386 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
387
388 if (random_pool_ready() != 1) {
389 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
390 "for secure operations - update keys later when "
391 "the first station connects");
392 }
393
394 /*
395 * Set initial GMK/Counter value here. The actual values that will be
396 * used in negotiations will be set once the first station tries to
397 * connect. This allows more time for collecting additional randomness
398 * on embedded devices.
399 */
400 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) {
401 wpa_printf(MSG_ERROR, "Failed to get random data for WPA "
402 "initialization.");
403 os_free(group);
404 return NULL;
405 }
406
407 group->GInit = TRUE;
408 if (delay_init) {
409 wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start "
410 "until Beacon frames have been configured");
411 /* Initialization is completed in wpa_init_keys(). */
412 } else {
413 wpa_group_sm_step(wpa_auth, group);
414 group->GInit = FALSE;
415 wpa_group_sm_step(wpa_auth, group);
416 }
417
418 return group;
419 }
420
421
422 /**
423 * wpa_init - Initialize WPA authenticator
424 * @addr: Authenticator address
425 * @conf: Configuration for WPA authenticator
426 * @cb: Callback functions for WPA authenticator
427 * Returns: Pointer to WPA authenticator data or %NULL on failure
428 */
wpa_init(const u8 * addr,struct wpa_auth_config * conf,const struct wpa_auth_callbacks * cb,void * cb_ctx)429 struct wpa_authenticator * wpa_init(const u8 *addr,
430 struct wpa_auth_config *conf,
431 const struct wpa_auth_callbacks *cb,
432 void *cb_ctx)
433 {
434 struct wpa_authenticator *wpa_auth;
435
436 wpa_auth = os_zalloc(sizeof(struct wpa_authenticator));
437 if (wpa_auth == NULL)
438 return NULL;
439 os_memcpy(wpa_auth->addr, addr, ETH_ALEN);
440 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
441 wpa_auth->cb = cb;
442 wpa_auth->cb_ctx = cb_ctx;
443
444 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
445 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
446 os_free(wpa_auth);
447 return NULL;
448 }
449
450 wpa_auth->group = wpa_group_init(wpa_auth, 0, 1);
451 if (wpa_auth->group == NULL) {
452 os_free(wpa_auth->wpa_ie);
453 os_free(wpa_auth);
454 return NULL;
455 }
456
457 wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb,
458 wpa_auth);
459 if (wpa_auth->pmksa == NULL) {
460 wpa_printf(MSG_ERROR, "PMKSA cache initialization failed.");
461 os_free(wpa_auth->group);
462 os_free(wpa_auth->wpa_ie);
463 os_free(wpa_auth);
464 return NULL;
465 }
466
467 #ifdef CONFIG_IEEE80211R_AP
468 wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init();
469 if (wpa_auth->ft_pmk_cache == NULL) {
470 wpa_printf(MSG_ERROR, "FT PMK cache initialization failed.");
471 os_free(wpa_auth->group);
472 os_free(wpa_auth->wpa_ie);
473 pmksa_cache_auth_deinit(wpa_auth->pmksa);
474 os_free(wpa_auth);
475 return NULL;
476 }
477 #endif /* CONFIG_IEEE80211R_AP */
478
479 if (wpa_auth->conf.wpa_gmk_rekey) {
480 eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0,
481 wpa_rekey_gmk, wpa_auth, NULL);
482 }
483
484 if (wpa_auth->conf.wpa_group_rekey) {
485 eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0,
486 wpa_rekey_gtk, wpa_auth, NULL);
487 }
488
489 #ifdef CONFIG_P2P
490 if (WPA_GET_BE32(conf->ip_addr_start)) {
491 int count = WPA_GET_BE32(conf->ip_addr_end) -
492 WPA_GET_BE32(conf->ip_addr_start) + 1;
493 if (count > 1000)
494 count = 1000;
495 if (count > 0)
496 wpa_auth->ip_pool = bitfield_alloc(count);
497 }
498 #endif /* CONFIG_P2P */
499
500 return wpa_auth;
501 }
502
503
wpa_init_keys(struct wpa_authenticator * wpa_auth)504 int wpa_init_keys(struct wpa_authenticator *wpa_auth)
505 {
506 struct wpa_group *group = wpa_auth->group;
507
508 wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial "
509 "keys");
510 wpa_group_sm_step(wpa_auth, group);
511 group->GInit = FALSE;
512 wpa_group_sm_step(wpa_auth, group);
513 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
514 return -1;
515 return 0;
516 }
517
518
519 /**
520 * wpa_deinit - Deinitialize WPA authenticator
521 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
522 */
wpa_deinit(struct wpa_authenticator * wpa_auth)523 void wpa_deinit(struct wpa_authenticator *wpa_auth)
524 {
525 struct wpa_group *group, *prev;
526
527 eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL);
528 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
529
530 pmksa_cache_auth_deinit(wpa_auth->pmksa);
531
532 #ifdef CONFIG_IEEE80211R_AP
533 wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache);
534 wpa_auth->ft_pmk_cache = NULL;
535 wpa_ft_deinit(wpa_auth);
536 #endif /* CONFIG_IEEE80211R_AP */
537
538 #ifdef CONFIG_P2P
539 bitfield_free(wpa_auth->ip_pool);
540 #endif /* CONFIG_P2P */
541
542
543 os_free(wpa_auth->wpa_ie);
544
545 group = wpa_auth->group;
546 while (group) {
547 prev = group;
548 group = group->next;
549 os_free(prev);
550 }
551
552 os_free(wpa_auth);
553 }
554
555
556 /**
557 * wpa_reconfig - Update WPA authenticator configuration
558 * @wpa_auth: Pointer to WPA authenticator data from wpa_init()
559 * @conf: Configuration for WPA authenticator
560 */
wpa_reconfig(struct wpa_authenticator * wpa_auth,struct wpa_auth_config * conf)561 int wpa_reconfig(struct wpa_authenticator *wpa_auth,
562 struct wpa_auth_config *conf)
563 {
564 struct wpa_group *group;
565 if (wpa_auth == NULL)
566 return 0;
567
568 os_memcpy(&wpa_auth->conf, conf, sizeof(*conf));
569 if (wpa_auth_gen_wpa_ie(wpa_auth)) {
570 wpa_printf(MSG_ERROR, "Could not generate WPA IE.");
571 return -1;
572 }
573
574 /*
575 * Reinitialize GTK to make sure it is suitable for the new
576 * configuration.
577 */
578 group = wpa_auth->group;
579 group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group);
580 group->GInit = TRUE;
581 wpa_group_sm_step(wpa_auth, group);
582 group->GInit = FALSE;
583 wpa_group_sm_step(wpa_auth, group);
584
585 return 0;
586 }
587
588
589 struct wpa_state_machine *
wpa_auth_sta_init(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr)590 wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr,
591 const u8 *p2p_dev_addr)
592 {
593 struct wpa_state_machine *sm;
594
595 if (wpa_auth->group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
596 return NULL;
597
598 sm = os_zalloc(sizeof(struct wpa_state_machine));
599 if (sm == NULL)
600 return NULL;
601 os_memcpy(sm->addr, addr, ETH_ALEN);
602 if (p2p_dev_addr)
603 os_memcpy(sm->p2p_dev_addr, p2p_dev_addr, ETH_ALEN);
604
605 sm->wpa_auth = wpa_auth;
606 sm->group = wpa_auth->group;
607 wpa_group_get(sm->wpa_auth, sm->group);
608
609 return sm;
610 }
611
612
wpa_auth_sta_associated(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm)613 int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth,
614 struct wpa_state_machine *sm)
615 {
616 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
617 return -1;
618
619 #ifdef CONFIG_IEEE80211R_AP
620 if (sm->ft_completed) {
621 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
622 "FT authentication already completed - do not "
623 "start 4-way handshake");
624 /* Go to PTKINITDONE state to allow GTK rekeying */
625 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
626 sm->Pair = TRUE;
627 return 0;
628 }
629 #endif /* CONFIG_IEEE80211R_AP */
630
631 #ifdef CONFIG_FILS
632 if (sm->fils_completed) {
633 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
634 "FILS authentication already completed - do not start 4-way handshake");
635 /* Go to PTKINITDONE state to allow GTK rekeying */
636 sm->wpa_ptk_state = WPA_PTK_PTKINITDONE;
637 sm->Pair = TRUE;
638 return 0;
639 }
640 #endif /* CONFIG_FILS */
641
642 if (sm->started) {
643 os_memset(&sm->key_replay, 0, sizeof(sm->key_replay));
644 sm->ReAuthenticationRequest = TRUE;
645 return wpa_sm_step(sm);
646 }
647
648 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
649 "start authentication");
650 sm->started = 1;
651
652 sm->Init = TRUE;
653 if (wpa_sm_step(sm) == 1)
654 return 1; /* should not really happen */
655 sm->Init = FALSE;
656 sm->AuthenticationRequest = TRUE;
657 return wpa_sm_step(sm);
658 }
659
660
wpa_auth_sta_no_wpa(struct wpa_state_machine * sm)661 void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm)
662 {
663 /* WPA/RSN was not used - clear WPA state. This is needed if the STA
664 * reassociates back to the same AP while the previous entry for the
665 * STA has not yet been removed. */
666 if (sm == NULL)
667 return;
668
669 sm->wpa_key_mgmt = 0;
670 }
671
672
wpa_free_sta_sm(struct wpa_state_machine * sm)673 static void wpa_free_sta_sm(struct wpa_state_machine *sm)
674 {
675 #ifdef CONFIG_P2P
676 if (WPA_GET_BE32(sm->ip_addr)) {
677 u32 start;
678 wpa_printf(MSG_DEBUG, "P2P: Free assigned IP "
679 "address %u.%u.%u.%u from " MACSTR,
680 sm->ip_addr[0], sm->ip_addr[1],
681 sm->ip_addr[2], sm->ip_addr[3],
682 MAC2STR(sm->addr));
683 start = WPA_GET_BE32(sm->wpa_auth->conf.ip_addr_start);
684 bitfield_clear(sm->wpa_auth->ip_pool,
685 WPA_GET_BE32(sm->ip_addr) - start);
686 }
687 #endif /* CONFIG_P2P */
688 if (sm->GUpdateStationKeys) {
689 sm->group->GKeyDoneStations--;
690 sm->GUpdateStationKeys = FALSE;
691 }
692 #ifdef CONFIG_IEEE80211R_AP
693 os_free(sm->assoc_resp_ftie);
694 wpabuf_free(sm->ft_pending_req_ies);
695 #endif /* CONFIG_IEEE80211R_AP */
696 os_free(sm->last_rx_eapol_key);
697 os_free(sm->wpa_ie);
698 wpa_group_put(sm->wpa_auth, sm->group);
699 #ifdef CONFIG_DPP2
700 wpabuf_clear_free(sm->dpp_z);
701 #endif /* CONFIG_DPP2 */
702 bin_clear_free(sm, sizeof(*sm));
703 }
704
705
wpa_auth_sta_deinit(struct wpa_state_machine * sm)706 void wpa_auth_sta_deinit(struct wpa_state_machine *sm)
707 {
708 if (sm == NULL)
709 return;
710
711 if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) {
712 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
713 "strict rekeying - force GTK rekey since STA "
714 "is leaving");
715 if (eloop_deplete_timeout(0, 500000, wpa_rekey_gtk,
716 sm->wpa_auth, NULL) == -1)
717 eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth,
718 NULL);
719 }
720
721 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
722 sm->pending_1_of_4_timeout = 0;
723 eloop_cancel_timeout(wpa_sm_call_step, sm, NULL);
724 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
725 #ifdef CONFIG_IEEE80211R_AP
726 wpa_ft_sta_deinit(sm);
727 #endif /* CONFIG_IEEE80211R_AP */
728 if (sm->in_step_loop) {
729 /* Must not free state machine while wpa_sm_step() is running.
730 * Freeing will be completed in the end of wpa_sm_step(). */
731 wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state "
732 "machine deinit for " MACSTR, MAC2STR(sm->addr));
733 sm->pending_deinit = 1;
734 } else
735 wpa_free_sta_sm(sm);
736 }
737
738
wpa_request_new_ptk(struct wpa_state_machine * sm)739 static void wpa_request_new_ptk(struct wpa_state_machine *sm)
740 {
741 if (sm == NULL)
742 return;
743
744 sm->PTKRequest = TRUE;
745 sm->PTK_valid = 0;
746 }
747
748
wpa_replay_counter_valid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)749 static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr,
750 const u8 *replay_counter)
751 {
752 int i;
753 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
754 if (!ctr[i].valid)
755 break;
756 if (os_memcmp(replay_counter, ctr[i].counter,
757 WPA_REPLAY_COUNTER_LEN) == 0)
758 return 1;
759 }
760 return 0;
761 }
762
763
wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter * ctr,const u8 * replay_counter)764 static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr,
765 const u8 *replay_counter)
766 {
767 int i;
768 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
769 if (ctr[i].valid &&
770 (replay_counter == NULL ||
771 os_memcmp(replay_counter, ctr[i].counter,
772 WPA_REPLAY_COUNTER_LEN) == 0))
773 ctr[i].valid = FALSE;
774 }
775 }
776
777
778 #ifdef CONFIG_IEEE80211R_AP
ft_check_msg_2_of_4(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,struct wpa_eapol_ie_parse * kde)779 static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth,
780 struct wpa_state_machine *sm,
781 struct wpa_eapol_ie_parse *kde)
782 {
783 struct wpa_ie_data ie;
784 struct rsn_mdie *mdie;
785
786 if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 ||
787 ie.num_pmkid != 1 || ie.pmkid == NULL) {
788 wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in "
789 "FT 4-way handshake message 2/4");
790 return -1;
791 }
792
793 os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN);
794 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant",
795 sm->sup_pmk_r1_name, PMKID_LEN);
796
797 if (!kde->mdie || !kde->ftie) {
798 wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake "
799 "message 2/4", kde->mdie ? "FTIE" : "MDIE");
800 return -1;
801 }
802
803 mdie = (struct rsn_mdie *) (kde->mdie + 2);
804 if (kde->mdie[1] < sizeof(struct rsn_mdie) ||
805 os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain,
806 MOBILITY_DOMAIN_ID_LEN) != 0) {
807 wpa_printf(MSG_DEBUG, "FT: MDIE mismatch");
808 return -1;
809 }
810
811 if (sm->assoc_resp_ftie &&
812 (kde->ftie[1] != sm->assoc_resp_ftie[1] ||
813 os_memcmp(kde->ftie, sm->assoc_resp_ftie,
814 2 + sm->assoc_resp_ftie[1]) != 0)) {
815 wpa_printf(MSG_DEBUG, "FT: FTIE mismatch");
816 wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4",
817 kde->ftie, kde->ftie_len);
818 wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp",
819 sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]);
820 return -1;
821 }
822
823 return 0;
824 }
825 #endif /* CONFIG_IEEE80211R_AP */
826
827
wpa_receive_error_report(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int group)828 static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth,
829 struct wpa_state_machine *sm, int group)
830 {
831 /* Supplicant reported a Michael MIC error */
832 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
833 "received EAPOL-Key Error Request "
834 "(STA detected Michael MIC failure (group=%d))",
835 group);
836
837 if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) {
838 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
839 "ignore Michael MIC failure report since "
840 "group cipher is not TKIP");
841 } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) {
842 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
843 "ignore Michael MIC failure report since "
844 "pairwise cipher is not TKIP");
845 } else {
846 if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0)
847 return 1; /* STA entry was removed */
848 sm->dot11RSNAStatsTKIPRemoteMICFailures++;
849 wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++;
850 }
851
852 /*
853 * Error report is not a request for a new key handshake, but since
854 * Authenticator may do it, let's change the keys now anyway.
855 */
856 wpa_request_new_ptk(sm);
857 return 0;
858 }
859
860
wpa_try_alt_snonce(struct wpa_state_machine * sm,u8 * data,size_t data_len)861 static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data,
862 size_t data_len)
863 {
864 struct wpa_ptk PTK;
865 int ok = 0;
866 const u8 *pmk = NULL;
867 size_t pmk_len;
868 int vlan_id = 0;
869
870 os_memset(&PTK, 0, sizeof(PTK));
871 for (;;) {
872 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) &&
873 !wpa_key_mgmt_sae(sm->wpa_key_mgmt)) {
874 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
875 sm->p2p_dev_addr, pmk, &pmk_len,
876 &vlan_id);
877 if (pmk == NULL)
878 break;
879 #ifdef CONFIG_IEEE80211R_AP
880 if (wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
881 os_memcpy(sm->xxkey, pmk, pmk_len);
882 sm->xxkey_len = pmk_len;
883 }
884 #endif /* CONFIG_IEEE80211R_AP */
885 } else {
886 pmk = sm->PMK;
887 pmk_len = sm->pmk_len;
888 }
889
890 if (wpa_derive_ptk(sm, sm->alt_SNonce, pmk, pmk_len, &PTK) < 0)
891 break;
892
893 if (wpa_verify_key_mic(sm->wpa_key_mgmt, pmk_len, &PTK,
894 data, data_len) == 0) {
895 if (sm->PMK != pmk) {
896 os_memcpy(sm->PMK, pmk, pmk_len);
897 sm->pmk_len = pmk_len;
898 }
899 ok = 1;
900 break;
901 }
902
903 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) ||
904 wpa_key_mgmt_sae(sm->wpa_key_mgmt))
905 break;
906 }
907
908 if (!ok) {
909 wpa_printf(MSG_DEBUG,
910 "WPA: Earlier SNonce did not result in matching MIC");
911 return -1;
912 }
913
914 wpa_printf(MSG_DEBUG,
915 "WPA: Earlier SNonce resulted in matching MIC");
916 sm->alt_snonce_valid = 0;
917
918 if (vlan_id && wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) &&
919 wpa_auth_update_vlan(sm->wpa_auth, sm->addr, vlan_id) < 0)
920 return -1;
921
922 os_memcpy(sm->SNonce, sm->alt_SNonce, WPA_NONCE_LEN);
923 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
924 sm->PTK_valid = TRUE;
925
926 return 0;
927 }
928
929
wpa_receive(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,u8 * data,size_t data_len)930 void wpa_receive(struct wpa_authenticator *wpa_auth,
931 struct wpa_state_machine *sm,
932 u8 *data, size_t data_len)
933 {
934 struct ieee802_1x_hdr *hdr;
935 struct wpa_eapol_key *key;
936 u16 key_info, key_data_length;
937 enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST } msg;
938 char *msgtxt;
939 struct wpa_eapol_ie_parse kde;
940 const u8 *key_data;
941 size_t keyhdrlen, mic_len;
942 u8 *mic;
943
944 if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL)
945 return;
946 wpa_hexdump(MSG_MSGDUMP, "WPA: RX EAPOL data", data, data_len);
947
948 mic_len = wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len);
949 keyhdrlen = sizeof(*key) + mic_len + 2;
950
951 if (data_len < sizeof(*hdr) + keyhdrlen) {
952 wpa_printf(MSG_DEBUG, "WPA: Ignore too short EAPOL-Key frame");
953 return;
954 }
955
956 hdr = (struct ieee802_1x_hdr *) data;
957 key = (struct wpa_eapol_key *) (hdr + 1);
958 mic = (u8 *) (key + 1);
959 key_info = WPA_GET_BE16(key->key_info);
960 key_data = mic + mic_len + 2;
961 key_data_length = WPA_GET_BE16(mic + mic_len);
962 wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR
963 " key_info=0x%x type=%u mic_len=%u key_data_length=%u",
964 MAC2STR(sm->addr), key_info, key->type,
965 (unsigned int) mic_len, key_data_length);
966 wpa_hexdump(MSG_MSGDUMP,
967 "WPA: EAPOL-Key header (ending before Key MIC)",
968 key, sizeof(*key));
969 wpa_hexdump(MSG_MSGDUMP, "WPA: EAPOL-Key Key MIC",
970 mic, mic_len);
971 if (key_data_length > data_len - sizeof(*hdr) - keyhdrlen) {
972 wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - "
973 "key_data overflow (%d > %lu)",
974 key_data_length,
975 (unsigned long) (data_len - sizeof(*hdr) -
976 keyhdrlen));
977 return;
978 }
979
980 if (sm->wpa == WPA_VERSION_WPA2) {
981 if (key->type == EAPOL_KEY_TYPE_WPA) {
982 /*
983 * Some deployed station implementations seem to send
984 * msg 4/4 with incorrect type value in WPA2 mode.
985 */
986 wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
987 "with unexpected WPA type in RSN mode");
988 } else if (key->type != EAPOL_KEY_TYPE_RSN) {
989 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
990 "unexpected type %d in RSN mode",
991 key->type);
992 return;
993 }
994 } else {
995 if (key->type != EAPOL_KEY_TYPE_WPA) {
996 wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
997 "unexpected type %d in WPA mode",
998 key->type);
999 return;
1000 }
1001 }
1002
1003 wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce,
1004 WPA_NONCE_LEN);
1005 wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter",
1006 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1007
1008 /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys
1009 * are set */
1010
1011 if (key_info & WPA_KEY_INFO_SMK_MESSAGE) {
1012 wpa_printf(MSG_DEBUG, "WPA: Ignore SMK message");
1013 return;
1014 }
1015
1016 if (key_info & WPA_KEY_INFO_REQUEST) {
1017 msg = REQUEST;
1018 msgtxt = "Request";
1019 } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) {
1020 msg = GROUP_2;
1021 msgtxt = "2/2 Group";
1022 } else if (key_data_length == 0 ||
1023 (mic_len == 0 && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA) &&
1024 key_data_length == AES_BLOCK_SIZE)) {
1025 msg = PAIRWISE_4;
1026 msgtxt = "4/4 Pairwise";
1027 } else {
1028 msg = PAIRWISE_2;
1029 msgtxt = "2/4 Pairwise";
1030 }
1031
1032 if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 ||
1033 msg == GROUP_2) {
1034 u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK;
1035 if (sm->pairwise == WPA_CIPHER_CCMP ||
1036 sm->pairwise == WPA_CIPHER_GCMP) {
1037 if (wpa_use_cmac(sm->wpa_key_mgmt) &&
1038 !wpa_use_akm_defined(sm->wpa_key_mgmt) &&
1039 ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1040 wpa_auth_logger(wpa_auth, sm->addr,
1041 LOGGER_WARNING,
1042 "advertised support for "
1043 "AES-128-CMAC, but did not "
1044 "use it");
1045 return;
1046 }
1047
1048 if (!wpa_use_cmac(sm->wpa_key_mgmt) &&
1049 !wpa_use_akm_defined(sm->wpa_key_mgmt) &&
1050 ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
1051 wpa_auth_logger(wpa_auth, sm->addr,
1052 LOGGER_WARNING,
1053 "did not use HMAC-SHA1-AES "
1054 "with CCMP/GCMP");
1055 return;
1056 }
1057 }
1058
1059 if (wpa_use_akm_defined(sm->wpa_key_mgmt) &&
1060 ver != WPA_KEY_INFO_TYPE_AKM_DEFINED) {
1061 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1062 "did not use EAPOL-Key descriptor version 0 as required for AKM-defined cases");
1063 return;
1064 }
1065 }
1066
1067 if (key_info & WPA_KEY_INFO_REQUEST) {
1068 if (sm->req_replay_counter_used &&
1069 os_memcmp(key->replay_counter, sm->req_replay_counter,
1070 WPA_REPLAY_COUNTER_LEN) <= 0) {
1071 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING,
1072 "received EAPOL-Key request with "
1073 "replayed counter");
1074 return;
1075 }
1076 }
1077
1078 if (!(key_info & WPA_KEY_INFO_REQUEST) &&
1079 !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) {
1080 int i;
1081
1082 if (msg == PAIRWISE_2 &&
1083 wpa_replay_counter_valid(sm->prev_key_replay,
1084 key->replay_counter) &&
1085 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1086 os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0)
1087 {
1088 /*
1089 * Some supplicant implementations (e.g., Windows XP
1090 * WZC) update SNonce for each EAPOL-Key 2/4. This
1091 * breaks the workaround on accepting any of the
1092 * pending requests, so allow the SNonce to be updated
1093 * even if we have already sent out EAPOL-Key 3/4.
1094 */
1095 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1096 "Process SNonce update from STA "
1097 "based on retransmitted EAPOL-Key "
1098 "1/4");
1099 sm->update_snonce = 1;
1100 os_memcpy(sm->alt_SNonce, sm->SNonce, WPA_NONCE_LEN);
1101 sm->alt_snonce_valid = TRUE;
1102 os_memcpy(sm->alt_replay_counter,
1103 sm->key_replay[0].counter,
1104 WPA_REPLAY_COUNTER_LEN);
1105 goto continue_processing;
1106 }
1107
1108 if (msg == PAIRWISE_4 && sm->alt_snonce_valid &&
1109 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING &&
1110 os_memcmp(key->replay_counter, sm->alt_replay_counter,
1111 WPA_REPLAY_COUNTER_LEN) == 0) {
1112 /*
1113 * Supplicant may still be using the old SNonce since
1114 * there was two EAPOL-Key 2/4 messages and they had
1115 * different SNonce values.
1116 */
1117 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1118 "Try to process received EAPOL-Key 4/4 based on old Replay Counter and SNonce from an earlier EAPOL-Key 1/4");
1119 goto continue_processing;
1120 }
1121
1122 if (msg == PAIRWISE_2 &&
1123 wpa_replay_counter_valid(sm->prev_key_replay,
1124 key->replay_counter) &&
1125 sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) {
1126 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1127 "ignore retransmitted EAPOL-Key %s - "
1128 "SNonce did not change", msgtxt);
1129 } else {
1130 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1131 "received EAPOL-Key %s with "
1132 "unexpected replay counter", msgtxt);
1133 }
1134 for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) {
1135 if (!sm->key_replay[i].valid)
1136 break;
1137 wpa_hexdump(MSG_DEBUG, "pending replay counter",
1138 sm->key_replay[i].counter,
1139 WPA_REPLAY_COUNTER_LEN);
1140 }
1141 wpa_hexdump(MSG_DEBUG, "received replay counter",
1142 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1143 return;
1144 }
1145
1146 continue_processing:
1147 #ifdef CONFIG_FILS
1148 if (sm->wpa == WPA_VERSION_WPA2 && mic_len == 0 &&
1149 !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
1150 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1151 "WPA: Encr Key Data bit not set even though AEAD cipher is supposed to be used - drop frame");
1152 return;
1153 }
1154 #endif /* CONFIG_FILS */
1155
1156 switch (msg) {
1157 case PAIRWISE_2:
1158 if (sm->wpa_ptk_state != WPA_PTK_PTKSTART &&
1159 sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING &&
1160 (!sm->update_snonce ||
1161 sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) {
1162 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1163 "received EAPOL-Key msg 2/4 in "
1164 "invalid state (%d) - dropped",
1165 sm->wpa_ptk_state);
1166 return;
1167 }
1168 random_add_randomness(key->key_nonce, WPA_NONCE_LEN);
1169 if (sm->group->reject_4way_hs_for_entropy) {
1170 /*
1171 * The system did not have enough entropy to generate
1172 * strong random numbers. Reject the first 4-way
1173 * handshake(s) and collect some entropy based on the
1174 * information from it. Once enough entropy is
1175 * available, the next atempt will trigger GMK/Key
1176 * Counter update and the station will be allowed to
1177 * continue.
1178 */
1179 wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to "
1180 "collect more entropy for random number "
1181 "generation");
1182 random_mark_pool_ready();
1183 wpa_sta_disconnect(wpa_auth, sm->addr,
1184 WLAN_REASON_PREV_AUTH_NOT_VALID);
1185 return;
1186 }
1187 break;
1188 case PAIRWISE_4:
1189 if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING ||
1190 !sm->PTK_valid) {
1191 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1192 "received EAPOL-Key msg 4/4 in "
1193 "invalid state (%d) - dropped",
1194 sm->wpa_ptk_state);
1195 return;
1196 }
1197 break;
1198 case GROUP_2:
1199 if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING
1200 || !sm->PTK_valid) {
1201 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
1202 "received EAPOL-Key msg 2/2 in "
1203 "invalid state (%d) - dropped",
1204 sm->wpa_ptk_group_state);
1205 return;
1206 }
1207 break;
1208 case REQUEST:
1209 break;
1210 }
1211
1212 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG,
1213 "received EAPOL-Key frame (%s)", msgtxt);
1214
1215 if (key_info & WPA_KEY_INFO_ACK) {
1216 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1217 "received invalid EAPOL-Key: Key Ack set");
1218 return;
1219 }
1220
1221 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1222 !(key_info & WPA_KEY_INFO_MIC)) {
1223 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1224 "received invalid EAPOL-Key: Key MIC not set");
1225 return;
1226 }
1227
1228 #ifdef CONFIG_FILS
1229 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1230 (key_info & WPA_KEY_INFO_MIC)) {
1231 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1232 "received invalid EAPOL-Key: Key MIC set");
1233 return;
1234 }
1235 #endif /* CONFIG_FILS */
1236
1237 sm->MICVerified = FALSE;
1238 if (sm->PTK_valid && !sm->update_snonce) {
1239 if (mic_len &&
1240 wpa_verify_key_mic(sm->wpa_key_mgmt, sm->pmk_len, &sm->PTK,
1241 data, data_len) &&
1242 (msg != PAIRWISE_4 || !sm->alt_snonce_valid ||
1243 wpa_try_alt_snonce(sm, data, data_len))) {
1244 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1245 "received EAPOL-Key with invalid MIC");
1246 #ifdef TEST_FUZZ
1247 wpa_printf(MSG_INFO,
1248 "TEST: Ignore Key MIC failure for fuzz testing");
1249 goto continue_fuzz;
1250 #endif /* TEST_FUZZ */
1251 return;
1252 }
1253 #ifdef CONFIG_FILS
1254 if (!mic_len &&
1255 wpa_aead_decrypt(sm, &sm->PTK, data, data_len,
1256 &key_data_length) < 0) {
1257 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1258 "received EAPOL-Key with invalid MIC");
1259 #ifdef TEST_FUZZ
1260 wpa_printf(MSG_INFO,
1261 "TEST: Ignore Key MIC failure for fuzz testing");
1262 goto continue_fuzz;
1263 #endif /* TEST_FUZZ */
1264 return;
1265 }
1266 #endif /* CONFIG_FILS */
1267 #ifdef TEST_FUZZ
1268 continue_fuzz:
1269 #endif /* TEST_FUZZ */
1270 sm->MICVerified = TRUE;
1271 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
1272 sm->pending_1_of_4_timeout = 0;
1273 }
1274
1275 if (key_info & WPA_KEY_INFO_REQUEST) {
1276 if (sm->MICVerified) {
1277 sm->req_replay_counter_used = 1;
1278 os_memcpy(sm->req_replay_counter, key->replay_counter,
1279 WPA_REPLAY_COUNTER_LEN);
1280 } else {
1281 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1282 "received EAPOL-Key request with "
1283 "invalid MIC");
1284 return;
1285 }
1286
1287 /*
1288 * TODO: should decrypt key data field if encryption was used;
1289 * even though MAC address KDE is not normally encrypted,
1290 * supplicant is allowed to encrypt it.
1291 */
1292 if (key_info & WPA_KEY_INFO_ERROR) {
1293 if (wpa_receive_error_report(
1294 wpa_auth, sm,
1295 !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0)
1296 return; /* STA entry was removed */
1297 } else if (key_info & WPA_KEY_INFO_KEY_TYPE) {
1298 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1299 "received EAPOL-Key Request for new "
1300 "4-Way Handshake");
1301 wpa_request_new_ptk(sm);
1302 } else if (key_data_length > 0 &&
1303 wpa_parse_kde_ies(key_data, key_data_length,
1304 &kde) == 0 &&
1305 kde.mac_addr) {
1306 } else {
1307 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1308 "received EAPOL-Key Request for GTK "
1309 "rekeying");
1310 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
1311 wpa_rekey_gtk(wpa_auth, NULL);
1312 }
1313 } else {
1314 /* Do not allow the same key replay counter to be reused. */
1315 wpa_replay_counter_mark_invalid(sm->key_replay,
1316 key->replay_counter);
1317
1318 if (msg == PAIRWISE_2) {
1319 /*
1320 * Maintain a copy of the pending EAPOL-Key frames in
1321 * case the EAPOL-Key frame was retransmitted. This is
1322 * needed to allow EAPOL-Key msg 2/4 reply to another
1323 * pending msg 1/4 to update the SNonce to work around
1324 * unexpected supplicant behavior.
1325 */
1326 os_memcpy(sm->prev_key_replay, sm->key_replay,
1327 sizeof(sm->key_replay));
1328 } else {
1329 os_memset(sm->prev_key_replay, 0,
1330 sizeof(sm->prev_key_replay));
1331 }
1332
1333 /*
1334 * Make sure old valid counters are not accepted anymore and
1335 * do not get copied again.
1336 */
1337 wpa_replay_counter_mark_invalid(sm->key_replay, NULL);
1338 }
1339
1340 os_free(sm->last_rx_eapol_key);
1341 sm->last_rx_eapol_key = os_memdup(data, data_len);
1342 if (sm->last_rx_eapol_key == NULL)
1343 return;
1344 sm->last_rx_eapol_key_len = data_len;
1345
1346 sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE);
1347 sm->EAPOLKeyReceived = TRUE;
1348 sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1349 sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST);
1350 os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN);
1351 wpa_sm_step(sm);
1352 }
1353
1354
wpa_gmk_to_gtk(const u8 * gmk,const char * label,const u8 * addr,const u8 * gnonce,u8 * gtk,size_t gtk_len)1355 static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr,
1356 const u8 *gnonce, u8 *gtk, size_t gtk_len)
1357 {
1358 u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + WPA_GTK_MAX_LEN];
1359 u8 *pos;
1360 int ret = 0;
1361
1362 /* GTK = PRF-X(GMK, "Group key expansion",
1363 * AA || GNonce || Time || random data)
1364 * The example described in the IEEE 802.11 standard uses only AA and
1365 * GNonce as inputs here. Add some more entropy since this derivation
1366 * is done only at the Authenticator and as such, does not need to be
1367 * exactly same.
1368 */
1369 os_memset(data, 0, sizeof(data));
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 #ifdef TEST_FUZZ
1375 os_memset(pos, 0xef, 8);
1376 #endif /* TEST_FUZZ */
1377 pos += 8;
1378 if (random_get_bytes(pos, gtk_len) < 0)
1379 ret = -1;
1380
1381 #ifdef CONFIG_SHA384
1382 if (sha384_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data),
1383 gtk, gtk_len) < 0)
1384 ret = -1;
1385 #else /* CONFIG_SHA384 */
1386 #ifdef CONFIG_SHA256
1387 if (sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data),
1388 gtk, gtk_len) < 0)
1389 ret = -1;
1390 #else /* CONFIG_SHA256 */
1391 if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data),
1392 gtk, gtk_len) < 0)
1393 ret = -1;
1394 #endif /* CONFIG_SHA256 */
1395 #endif /* CONFIG_SHA384 */
1396
1397 return ret;
1398 }
1399
1400
wpa_send_eapol_timeout(void * eloop_ctx,void * timeout_ctx)1401 static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx)
1402 {
1403 struct wpa_authenticator *wpa_auth = eloop_ctx;
1404 struct wpa_state_machine *sm = timeout_ctx;
1405
1406 sm->pending_1_of_4_timeout = 0;
1407 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout");
1408 sm->TimeoutEvt = TRUE;
1409 wpa_sm_step(sm);
1410 }
1411
1412
__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)1413 void __wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1414 struct wpa_state_machine *sm, int key_info,
1415 const u8 *key_rsc, const u8 *nonce,
1416 const u8 *kde, size_t kde_len,
1417 int keyidx, int encr, int force_version)
1418 {
1419 struct ieee802_1x_hdr *hdr;
1420 struct wpa_eapol_key *key;
1421 size_t len, mic_len, keyhdrlen;
1422 int alg;
1423 int key_data_len, pad_len = 0;
1424 u8 *buf, *pos;
1425 int version, pairwise;
1426 int i;
1427 u8 *key_mic, *key_data;
1428
1429 mic_len = wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len);
1430 keyhdrlen = sizeof(*key) + mic_len + 2;
1431
1432 len = sizeof(struct ieee802_1x_hdr) + keyhdrlen;
1433
1434 if (force_version)
1435 version = force_version;
1436 else if (wpa_use_akm_defined(sm->wpa_key_mgmt))
1437 version = WPA_KEY_INFO_TYPE_AKM_DEFINED;
1438 else if (wpa_use_cmac(sm->wpa_key_mgmt))
1439 version = WPA_KEY_INFO_TYPE_AES_128_CMAC;
1440 else if (sm->pairwise != WPA_CIPHER_TKIP)
1441 version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
1442 else
1443 version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
1444
1445 pairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE);
1446
1447 wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d "
1448 "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d "
1449 "encr=%d)",
1450 version,
1451 (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0,
1452 (key_info & WPA_KEY_INFO_MIC) ? 1 : 0,
1453 (key_info & WPA_KEY_INFO_ACK) ? 1 : 0,
1454 (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0,
1455 pairwise, (unsigned long) kde_len, keyidx, encr);
1456
1457 key_data_len = kde_len;
1458
1459 if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1460 wpa_use_aes_key_wrap(sm->wpa_key_mgmt) ||
1461 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) {
1462 pad_len = key_data_len % 8;
1463 if (pad_len)
1464 pad_len = 8 - pad_len;
1465 key_data_len += pad_len + 8;
1466 }
1467
1468 len += key_data_len;
1469 if (!mic_len && encr)
1470 len += AES_BLOCK_SIZE;
1471
1472 hdr = os_zalloc(len);
1473 if (hdr == NULL)
1474 return;
1475 hdr->version = wpa_auth->conf.eapol_version;
1476 hdr->type = IEEE802_1X_TYPE_EAPOL_KEY;
1477 hdr->length = host_to_be16(len - sizeof(*hdr));
1478 key = (struct wpa_eapol_key *) (hdr + 1);
1479 key_mic = (u8 *) (key + 1);
1480 key_data = ((u8 *) (hdr + 1)) + keyhdrlen;
1481
1482 key->type = sm->wpa == WPA_VERSION_WPA2 ?
1483 EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA;
1484 key_info |= version;
1485 if (encr && sm->wpa == WPA_VERSION_WPA2)
1486 key_info |= WPA_KEY_INFO_ENCR_KEY_DATA;
1487 if (sm->wpa != WPA_VERSION_WPA2)
1488 key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT;
1489 WPA_PUT_BE16(key->key_info, key_info);
1490
1491 alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group;
1492 if (sm->wpa == WPA_VERSION_WPA2 && !pairwise)
1493 WPA_PUT_BE16(key->key_length, 0);
1494 else
1495 WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg));
1496
1497 for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) {
1498 sm->key_replay[i].valid = sm->key_replay[i - 1].valid;
1499 os_memcpy(sm->key_replay[i].counter,
1500 sm->key_replay[i - 1].counter,
1501 WPA_REPLAY_COUNTER_LEN);
1502 }
1503 inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN);
1504 os_memcpy(key->replay_counter, sm->key_replay[0].counter,
1505 WPA_REPLAY_COUNTER_LEN);
1506 wpa_hexdump(MSG_DEBUG, "WPA: Replay Counter",
1507 key->replay_counter, WPA_REPLAY_COUNTER_LEN);
1508 sm->key_replay[0].valid = TRUE;
1509
1510 if (nonce)
1511 os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN);
1512
1513 if (key_rsc)
1514 os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN);
1515
1516 if (kde && !encr) {
1517 os_memcpy(key_data, kde, kde_len);
1518 WPA_PUT_BE16(key_mic + mic_len, kde_len);
1519 #ifdef CONFIG_FILS
1520 } else if (!mic_len && kde) {
1521 const u8 *aad[1];
1522 size_t aad_len[1];
1523
1524 WPA_PUT_BE16(key_mic, AES_BLOCK_SIZE + kde_len);
1525 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1526 kde, kde_len);
1527
1528 wpa_hexdump_key(MSG_DEBUG, "WPA: KEK",
1529 sm->PTK.kek, sm->PTK.kek_len);
1530 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
1531 * to Key Data (exclusive). */
1532 aad[0] = (u8 *) hdr;
1533 aad_len[0] = key_mic + 2 - (u8 *) hdr;
1534 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len, kde, kde_len,
1535 1, aad, aad_len, key_mic + 2) < 0) {
1536 wpa_printf(MSG_DEBUG, "WPA: AES-SIV encryption failed");
1537 return;
1538 }
1539
1540 wpa_hexdump(MSG_DEBUG, "WPA: Encrypted Key Data from SIV",
1541 key_mic + 2, AES_BLOCK_SIZE + kde_len);
1542 #endif /* CONFIG_FILS */
1543 } else if (encr && kde) {
1544 buf = os_zalloc(key_data_len);
1545 if (buf == NULL) {
1546 os_free(hdr);
1547 return;
1548 }
1549 pos = buf;
1550 os_memcpy(pos, kde, kde_len);
1551 pos += kde_len;
1552
1553 if (pad_len)
1554 *pos++ = 0xdd;
1555
1556 wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data",
1557 buf, key_data_len);
1558 if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES ||
1559 wpa_use_aes_key_wrap(sm->wpa_key_mgmt) ||
1560 version == WPA_KEY_INFO_TYPE_AES_128_CMAC) {
1561 wpa_printf(MSG_DEBUG,
1562 "WPA: Encrypt Key Data using AES-WRAP (KEK length %u)",
1563 (unsigned int) sm->PTK.kek_len);
1564 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len,
1565 (key_data_len - 8) / 8, buf, key_data)) {
1566 os_free(hdr);
1567 os_free(buf);
1568 return;
1569 }
1570 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1571 #ifndef CONFIG_NO_RC4
1572 } else if (sm->PTK.kek_len == 16) {
1573 u8 ek[32];
1574
1575 wpa_printf(MSG_DEBUG,
1576 "WPA: Encrypt Key Data using RC4");
1577 os_memcpy(key->key_iv,
1578 sm->group->Counter + WPA_NONCE_LEN - 16, 16);
1579 inc_byte_array(sm->group->Counter, WPA_NONCE_LEN);
1580 os_memcpy(ek, key->key_iv, 16);
1581 os_memcpy(ek + 16, sm->PTK.kek, sm->PTK.kek_len);
1582 os_memcpy(key_data, buf, key_data_len);
1583 rc4_skip(ek, 32, 256, key_data, key_data_len);
1584 WPA_PUT_BE16(key_mic + mic_len, key_data_len);
1585 #endif /* CONFIG_NO_RC4 */
1586 } else {
1587 os_free(hdr);
1588 os_free(buf);
1589 return;
1590 }
1591 os_free(buf);
1592 }
1593
1594 if (key_info & WPA_KEY_INFO_MIC) {
1595 if (!sm->PTK_valid || !mic_len) {
1596 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
1597 "PTK not valid when sending EAPOL-Key "
1598 "frame");
1599 os_free(hdr);
1600 return;
1601 }
1602
1603 if (wpa_eapol_key_mic(sm->PTK.kck, sm->PTK.kck_len,
1604 sm->wpa_key_mgmt, version,
1605 (u8 *) hdr, len, key_mic) < 0) {
1606 os_free(hdr);
1607 return;
1608 }
1609 #ifdef CONFIG_TESTING_OPTIONS
1610 if (!pairwise &&
1611 wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0 &&
1612 drand48() <
1613 wpa_auth->conf.corrupt_gtk_rekey_mic_probability) {
1614 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
1615 "Corrupting group EAPOL-Key Key MIC");
1616 key_mic[0]++;
1617 }
1618 #endif /* CONFIG_TESTING_OPTIONS */
1619 }
1620
1621 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx,
1622 1);
1623 wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len,
1624 sm->pairwise_set);
1625 os_free(hdr);
1626 }
1627
1628
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)1629 static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
1630 struct wpa_state_machine *sm, int key_info,
1631 const u8 *key_rsc, const u8 *nonce,
1632 const u8 *kde, size_t kde_len,
1633 int keyidx, int encr)
1634 {
1635 int timeout_ms;
1636 int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE;
1637 u32 ctr;
1638
1639 if (sm == NULL)
1640 return;
1641
1642 __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
1643 keyidx, encr, 0);
1644
1645 ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
1646 if (ctr == 1 && wpa_auth->conf.tx_status)
1647 timeout_ms = pairwise ? eapol_key_timeout_first :
1648 eapol_key_timeout_first_group;
1649 else
1650 timeout_ms = eapol_key_timeout_subseq;
1651 if (wpa_auth->conf.wpa_disable_eapol_key_retries &&
1652 (!pairwise || (key_info & WPA_KEY_INFO_MIC)))
1653 timeout_ms = eapol_key_timeout_no_retrans;
1654 if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC))
1655 sm->pending_1_of_4_timeout = 1;
1656 #ifdef TEST_FUZZ
1657 timeout_ms = 1;
1658 #endif /* TEST_FUZZ */
1659 wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry "
1660 "counter %u)", timeout_ms, ctr);
1661 eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000,
1662 wpa_send_eapol_timeout, wpa_auth, sm);
1663 }
1664
1665
wpa_verify_key_mic(int akmp,size_t pmk_len,struct wpa_ptk * PTK,u8 * data,size_t data_len)1666 static int wpa_verify_key_mic(int akmp, size_t pmk_len, struct wpa_ptk *PTK,
1667 u8 *data, size_t data_len)
1668 {
1669 struct ieee802_1x_hdr *hdr;
1670 struct wpa_eapol_key *key;
1671 u16 key_info;
1672 int ret = 0;
1673 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN], *mic_pos;
1674 size_t mic_len = wpa_mic_len(akmp, pmk_len);
1675
1676 if (data_len < sizeof(*hdr) + sizeof(*key))
1677 return -1;
1678
1679 hdr = (struct ieee802_1x_hdr *) data;
1680 key = (struct wpa_eapol_key *) (hdr + 1);
1681 mic_pos = (u8 *) (key + 1);
1682 key_info = WPA_GET_BE16(key->key_info);
1683 os_memcpy(mic, mic_pos, mic_len);
1684 os_memset(mic_pos, 0, mic_len);
1685 if (wpa_eapol_key_mic(PTK->kck, PTK->kck_len, akmp,
1686 key_info & WPA_KEY_INFO_TYPE_MASK,
1687 data, data_len, mic_pos) ||
1688 os_memcmp_const(mic, mic_pos, mic_len) != 0)
1689 ret = -1;
1690 os_memcpy(mic_pos, mic, mic_len);
1691 return ret;
1692 }
1693
1694
wpa_remove_ptk(struct wpa_state_machine * sm)1695 void wpa_remove_ptk(struct wpa_state_machine *sm)
1696 {
1697 sm->PTK_valid = FALSE;
1698 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1699 if (wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL,
1700 0))
1701 wpa_printf(MSG_DEBUG,
1702 "RSN: PTK removal from the driver failed");
1703 sm->pairwise_set = FALSE;
1704 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
1705 }
1706
1707
wpa_auth_sm_event(struct wpa_state_machine * sm,enum wpa_event event)1708 int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event)
1709 {
1710 int remove_ptk = 1;
1711
1712 if (sm == NULL)
1713 return -1;
1714
1715 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
1716 "event %d notification", event);
1717
1718 switch (event) {
1719 case WPA_AUTH:
1720 #ifdef CONFIG_MESH
1721 /* PTKs are derived through AMPE */
1722 if (wpa_auth_start_ampe(sm->wpa_auth, sm->addr)) {
1723 /* not mesh */
1724 break;
1725 }
1726 return 0;
1727 #endif /* CONFIG_MESH */
1728 case WPA_ASSOC:
1729 break;
1730 case WPA_DEAUTH:
1731 case WPA_DISASSOC:
1732 sm->DeauthenticationRequest = TRUE;
1733 #ifdef CONFIG_IEEE80211R_AP
1734 os_memset(sm->PMK, 0, sizeof(sm->PMK));
1735 sm->pmk_len = 0;
1736 os_memset(sm->xxkey, 0, sizeof(sm->xxkey));
1737 sm->xxkey_len = 0;
1738 #endif /* CONFIG_IEEE80211R_AP */
1739 break;
1740 case WPA_REAUTH:
1741 case WPA_REAUTH_EAPOL:
1742 if (!sm->started) {
1743 /*
1744 * When using WPS, we may end up here if the STA
1745 * manages to re-associate without the previous STA
1746 * entry getting removed. Consequently, we need to make
1747 * sure that the WPA state machines gets initialized
1748 * properly at this point.
1749 */
1750 wpa_printf(MSG_DEBUG, "WPA state machine had not been "
1751 "started - initialize now");
1752 sm->started = 1;
1753 sm->Init = TRUE;
1754 if (wpa_sm_step(sm) == 1)
1755 return 1; /* should not really happen */
1756 sm->Init = FALSE;
1757 sm->AuthenticationRequest = TRUE;
1758 break;
1759 }
1760 if (sm->GUpdateStationKeys) {
1761 /*
1762 * Reauthentication cancels the pending group key
1763 * update for this STA.
1764 */
1765 sm->group->GKeyDoneStations--;
1766 sm->GUpdateStationKeys = FALSE;
1767 sm->PtkGroupInit = TRUE;
1768 }
1769 sm->ReAuthenticationRequest = TRUE;
1770 break;
1771 case WPA_ASSOC_FT:
1772 #ifdef CONFIG_IEEE80211R_AP
1773 wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration "
1774 "after association");
1775 wpa_ft_install_ptk(sm);
1776
1777 /* Using FT protocol, not WPA auth state machine */
1778 sm->ft_completed = 1;
1779 return 0;
1780 #else /* CONFIG_IEEE80211R_AP */
1781 break;
1782 #endif /* CONFIG_IEEE80211R_AP */
1783 case WPA_ASSOC_FILS:
1784 #ifdef CONFIG_FILS
1785 wpa_printf(MSG_DEBUG,
1786 "FILS: TK configuration after association");
1787 fils_set_tk(sm);
1788 sm->fils_completed = 1;
1789 return 0;
1790 #else /* CONFIG_FILS */
1791 break;
1792 #endif /* CONFIG_FILS */
1793 case WPA_DRV_STA_REMOVED:
1794 sm->tk_already_set = FALSE;
1795 return 0;
1796 }
1797
1798 #ifdef CONFIG_IEEE80211R_AP
1799 sm->ft_completed = 0;
1800 #endif /* CONFIG_IEEE80211R_AP */
1801
1802 #ifdef CONFIG_IEEE80211W
1803 if (sm->mgmt_frame_prot && event == WPA_AUTH)
1804 remove_ptk = 0;
1805 #endif /* CONFIG_IEEE80211W */
1806 #ifdef CONFIG_FILS
1807 if (wpa_key_mgmt_fils(sm->wpa_key_mgmt) &&
1808 (event == WPA_AUTH || event == WPA_ASSOC))
1809 remove_ptk = 0;
1810 #endif /* CONFIG_FILS */
1811
1812 if (remove_ptk) {
1813 sm->PTK_valid = FALSE;
1814 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1815
1816 if (event != WPA_REAUTH_EAPOL)
1817 wpa_remove_ptk(sm);
1818 }
1819
1820 if (sm->in_step_loop) {
1821 /*
1822 * wpa_sm_step() is already running - avoid recursive call to
1823 * it by making the existing loop process the new update.
1824 */
1825 sm->changed = TRUE;
1826 return 0;
1827 }
1828 return wpa_sm_step(sm);
1829 }
1830
1831
SM_STATE(WPA_PTK,INITIALIZE)1832 SM_STATE(WPA_PTK, INITIALIZE)
1833 {
1834 SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk);
1835 if (sm->Init) {
1836 /* Init flag is not cleared here, so avoid busy
1837 * loop by claiming nothing changed. */
1838 sm->changed = FALSE;
1839 }
1840
1841 sm->keycount = 0;
1842 if (sm->GUpdateStationKeys)
1843 sm->group->GKeyDoneStations--;
1844 sm->GUpdateStationKeys = FALSE;
1845 if (sm->wpa == WPA_VERSION_WPA)
1846 sm->PInitAKeys = FALSE;
1847 if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and
1848 * Local AA > Remote AA)) */) {
1849 sm->Pair = TRUE;
1850 }
1851 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0);
1852 wpa_remove_ptk(sm);
1853 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0);
1854 sm->TimeoutCtr = 0;
1855 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) ||
1856 sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP ||
1857 sm->wpa_key_mgmt == WPA_KEY_MGMT_OWE) {
1858 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
1859 WPA_EAPOL_authorized, 0);
1860 }
1861 }
1862
1863
SM_STATE(WPA_PTK,DISCONNECT)1864 SM_STATE(WPA_PTK, DISCONNECT)
1865 {
1866 u16 reason = sm->disconnect_reason;
1867
1868 SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk);
1869 sm->Disconnect = FALSE;
1870 sm->disconnect_reason = 0;
1871 if (!reason)
1872 reason = WLAN_REASON_PREV_AUTH_NOT_VALID;
1873 wpa_sta_disconnect(sm->wpa_auth, sm->addr, reason);
1874 }
1875
1876
SM_STATE(WPA_PTK,DISCONNECTED)1877 SM_STATE(WPA_PTK, DISCONNECTED)
1878 {
1879 SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk);
1880 sm->DeauthenticationRequest = FALSE;
1881 }
1882
1883
SM_STATE(WPA_PTK,AUTHENTICATION)1884 SM_STATE(WPA_PTK, AUTHENTICATION)
1885 {
1886 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk);
1887 os_memset(&sm->PTK, 0, sizeof(sm->PTK));
1888 sm->PTK_valid = FALSE;
1889 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto,
1890 1);
1891 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1);
1892 sm->AuthenticationRequest = FALSE;
1893 }
1894
1895
wpa_group_ensure_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)1896 static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth,
1897 struct wpa_group *group)
1898 {
1899 if (group->first_sta_seen)
1900 return;
1901 /*
1902 * System has run bit further than at the time hostapd was started
1903 * potentially very early during boot up. This provides better chances
1904 * of collecting more randomness on embedded systems. Re-initialize the
1905 * GMK and Counter here to improve their strength if there was not
1906 * enough entropy available immediately after system startup.
1907 */
1908 wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first "
1909 "station");
1910 if (random_pool_ready() != 1) {
1911 wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool "
1912 "to proceed - reject first 4-way handshake");
1913 group->reject_4way_hs_for_entropy = TRUE;
1914 } else {
1915 group->first_sta_seen = TRUE;
1916 group->reject_4way_hs_for_entropy = FALSE;
1917 }
1918
1919 if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0 ||
1920 wpa_gtk_update(wpa_auth, group) < 0 ||
1921 wpa_group_config_group_keys(wpa_auth, group) < 0) {
1922 wpa_printf(MSG_INFO, "WPA: GMK/GTK setup failed");
1923 group->first_sta_seen = FALSE;
1924 group->reject_4way_hs_for_entropy = TRUE;
1925 }
1926 }
1927
1928
SM_STATE(WPA_PTK,AUTHENTICATION2)1929 SM_STATE(WPA_PTK, AUTHENTICATION2)
1930 {
1931 SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk);
1932
1933 wpa_group_ensure_init(sm->wpa_auth, sm->group);
1934 sm->ReAuthenticationRequest = FALSE;
1935
1936 /*
1937 * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat
1938 * ambiguous. The Authenticator state machine uses a counter that is
1939 * incremented by one for each 4-way handshake. However, the security
1940 * analysis of 4-way handshake points out that unpredictable nonces
1941 * help in preventing precomputation attacks. Instead of the state
1942 * machine definition, use an unpredictable nonce value here to provide
1943 * stronger protection against potential precomputation attacks.
1944 */
1945 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1946 wpa_printf(MSG_ERROR, "WPA: Failed to get random data for "
1947 "ANonce.");
1948 sm->Disconnect = TRUE;
1949 return;
1950 }
1951 wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce,
1952 WPA_NONCE_LEN);
1953 /* IEEE 802.11i does not clear TimeoutCtr here, but this is more
1954 * logical place than INITIALIZE since AUTHENTICATION2 can be
1955 * re-entered on ReAuthenticationRequest without going through
1956 * INITIALIZE. */
1957 sm->TimeoutCtr = 0;
1958 }
1959
1960
wpa_auth_sm_ptk_update(struct wpa_state_machine * sm)1961 static int wpa_auth_sm_ptk_update(struct wpa_state_machine *sm)
1962 {
1963 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1964 wpa_printf(MSG_ERROR,
1965 "WPA: Failed to get random data for ANonce");
1966 sm->Disconnect = TRUE;
1967 return -1;
1968 }
1969 wpa_hexdump(MSG_DEBUG, "WPA: Assign new ANonce", sm->ANonce,
1970 WPA_NONCE_LEN);
1971 sm->TimeoutCtr = 0;
1972 return 0;
1973 }
1974
1975
SM_STATE(WPA_PTK,INITPMK)1976 SM_STATE(WPA_PTK, INITPMK)
1977 {
1978 u8 msk[2 * PMK_LEN];
1979 size_t len = 2 * PMK_LEN;
1980
1981 SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk);
1982 #ifdef CONFIG_IEEE80211R_AP
1983 sm->xxkey_len = 0;
1984 #endif /* CONFIG_IEEE80211R_AP */
1985 if (sm->pmksa) {
1986 wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache");
1987 os_memcpy(sm->PMK, sm->pmksa->pmk, sm->pmksa->pmk_len);
1988 sm->pmk_len = sm->pmksa->pmk_len;
1989 #ifdef CONFIG_DPP
1990 } else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP) {
1991 wpa_printf(MSG_DEBUG,
1992 "DPP: No PMKSA cache entry for STA - reject connection");
1993 sm->Disconnect = TRUE;
1994 sm->disconnect_reason = WLAN_REASON_INVALID_PMKID;
1995 return;
1996 #endif /* CONFIG_DPP */
1997 } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) {
1998 unsigned int pmk_len;
1999
2000 if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt))
2001 pmk_len = PMK_LEN_SUITE_B_192;
2002 else
2003 pmk_len = PMK_LEN;
2004 wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine "
2005 "(MSK len=%lu PMK len=%u)", (unsigned long) len,
2006 pmk_len);
2007 if (len < pmk_len) {
2008 wpa_printf(MSG_DEBUG,
2009 "WPA: MSK not long enough (%u) to create PMK (%u)",
2010 (unsigned int) len, (unsigned int) pmk_len);
2011 sm->Disconnect = TRUE;
2012 return;
2013 }
2014 os_memcpy(sm->PMK, msk, pmk_len);
2015 sm->pmk_len = pmk_len;
2016 #ifdef CONFIG_IEEE80211R_AP
2017 if (len >= 2 * PMK_LEN) {
2018 if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) {
2019 os_memcpy(sm->xxkey, msk, SHA384_MAC_LEN);
2020 sm->xxkey_len = SHA384_MAC_LEN;
2021 } else {
2022 os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN);
2023 sm->xxkey_len = PMK_LEN;
2024 }
2025 }
2026 #endif /* CONFIG_IEEE80211R_AP */
2027 } else {
2028 wpa_printf(MSG_DEBUG, "WPA: Could not get PMK, get_msk: %p",
2029 sm->wpa_auth->cb->get_msk);
2030 sm->Disconnect = TRUE;
2031 return;
2032 }
2033 os_memset(msk, 0, sizeof(msk));
2034
2035 sm->req_replay_counter_used = 0;
2036 /* IEEE 802.11i does not set keyRun to FALSE, but not doing this
2037 * will break reauthentication since EAPOL state machines may not be
2038 * get into AUTHENTICATING state that clears keyRun before WPA state
2039 * machine enters AUTHENTICATION2 state and goes immediately to INITPMK
2040 * state and takes PMK from the previously used AAA Key. This will
2041 * eventually fail in 4-Way Handshake because Supplicant uses PMK
2042 * derived from the new AAA Key. Setting keyRun = FALSE here seems to
2043 * be good workaround for this issue. */
2044 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0);
2045 }
2046
2047
SM_STATE(WPA_PTK,INITPSK)2048 SM_STATE(WPA_PTK, INITPSK)
2049 {
2050 const u8 *psk;
2051 size_t psk_len;
2052
2053 SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk);
2054 psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr, NULL,
2055 &psk_len, NULL);
2056 if (psk) {
2057 os_memcpy(sm->PMK, psk, psk_len);
2058 sm->pmk_len = psk_len;
2059 #ifdef CONFIG_IEEE80211R_AP
2060 os_memcpy(sm->xxkey, psk, PMK_LEN);
2061 sm->xxkey_len = PMK_LEN;
2062 #endif /* CONFIG_IEEE80211R_AP */
2063 }
2064 #ifdef CONFIG_SAE
2065 if (wpa_auth_uses_sae(sm) && sm->pmksa) {
2066 wpa_printf(MSG_DEBUG, "SAE: PMK from PMKSA cache");
2067 os_memcpy(sm->PMK, sm->pmksa->pmk, sm->pmksa->pmk_len);
2068 sm->pmk_len = sm->pmksa->pmk_len;
2069 #ifdef CONFIG_IEEE80211R_AP
2070 os_memcpy(sm->xxkey, sm->pmksa->pmk, sm->pmksa->pmk_len);
2071 sm->xxkey_len = sm->pmksa->pmk_len;
2072 #endif /* CONFIG_IEEE80211R_AP */
2073 }
2074 #endif /* CONFIG_SAE */
2075 sm->req_replay_counter_used = 0;
2076 }
2077
2078
SM_STATE(WPA_PTK,PTKSTART)2079 SM_STATE(WPA_PTK, PTKSTART)
2080 {
2081 u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL;
2082 size_t pmkid_len = 0;
2083
2084 SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk);
2085 sm->PTKRequest = FALSE;
2086 sm->TimeoutEvt = FALSE;
2087 sm->alt_snonce_valid = FALSE;
2088
2089 sm->TimeoutCtr++;
2090 if (sm->TimeoutCtr > sm->wpa_auth->conf.wpa_pairwise_update_count) {
2091 /* No point in sending the EAPOL-Key - we will disconnect
2092 * immediately following this. */
2093 return;
2094 }
2095
2096 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2097 "sending 1/4 msg of 4-Way Handshake");
2098 /*
2099 * For infrastructure BSS cases, it is better for the AP not to include
2100 * the PMKID KDE in EAPOL-Key msg 1/4 since it could be used to initiate
2101 * offline search for the passphrase/PSK without having to be able to
2102 * capture a 4-way handshake from a STA that has access to the network.
2103 *
2104 * For IBSS cases, addition of PMKID KDE could be considered even with
2105 * WPA2-PSK cases that use multiple PSKs, but only if there is a single
2106 * possible PSK for this STA. However, this should not be done unless
2107 * there is support for using that information on the supplicant side.
2108 * The concern about exposing PMKID unnecessarily in infrastructure BSS
2109 * cases would also apply here, but at least in the IBSS case, this
2110 * would cover a potential real use case.
2111 */
2112 if (sm->wpa == WPA_VERSION_WPA2 &&
2113 (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) ||
2114 (sm->wpa_key_mgmt == WPA_KEY_MGMT_OWE && sm->pmksa) ||
2115 wpa_key_mgmt_sae(sm->wpa_key_mgmt)) &&
2116 sm->wpa_key_mgmt != WPA_KEY_MGMT_OSEN) {
2117 pmkid = buf;
2118 pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
2119 pmkid[0] = WLAN_EID_VENDOR_SPECIFIC;
2120 pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN;
2121 RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID);
2122 if (sm->pmksa) {
2123 wpa_hexdump(MSG_DEBUG,
2124 "RSN: Message 1/4 PMKID from PMKSA entry",
2125 sm->pmksa->pmkid, PMKID_LEN);
2126 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
2127 sm->pmksa->pmkid, PMKID_LEN);
2128 } else if (wpa_key_mgmt_suite_b(sm->wpa_key_mgmt)) {
2129 /* No KCK available to derive PMKID */
2130 wpa_printf(MSG_DEBUG,
2131 "RSN: No KCK available to derive PMKID for message 1/4");
2132 pmkid = NULL;
2133 #ifdef CONFIG_SAE
2134 } else if (wpa_key_mgmt_sae(sm->wpa_key_mgmt)) {
2135 if (sm->pmkid_set) {
2136 wpa_hexdump(MSG_DEBUG,
2137 "RSN: Message 1/4 PMKID from SAE",
2138 sm->pmkid, PMKID_LEN);
2139 os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN],
2140 sm->pmkid, PMKID_LEN);
2141 } else {
2142 /* No PMKID available */
2143 wpa_printf(MSG_DEBUG,
2144 "RSN: No SAE PMKID available for message 1/4");
2145 pmkid = NULL;
2146 }
2147 #endif /* CONFIG_SAE */
2148 } else {
2149 /*
2150 * Calculate PMKID since no PMKSA cache entry was
2151 * available with pre-calculated PMKID.
2152 */
2153 rsn_pmkid(sm->PMK, sm->pmk_len, sm->wpa_auth->addr,
2154 sm->addr, &pmkid[2 + RSN_SELECTOR_LEN],
2155 sm->wpa_key_mgmt);
2156 wpa_hexdump(MSG_DEBUG,
2157 "RSN: Message 1/4 PMKID derived from PMK",
2158 &pmkid[2 + RSN_SELECTOR_LEN], PMKID_LEN);
2159 }
2160 }
2161 wpa_send_eapol(sm->wpa_auth, sm,
2162 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
2163 sm->ANonce, pmkid, pmkid_len, 0, 0);
2164 }
2165
2166
wpa_derive_ptk(struct wpa_state_machine * sm,const u8 * snonce,const u8 * pmk,unsigned int pmk_len,struct wpa_ptk * ptk)2167 static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *snonce,
2168 const u8 *pmk, unsigned int pmk_len,
2169 struct wpa_ptk *ptk)
2170 {
2171 const u8 *z = NULL;
2172 size_t z_len = 0;
2173
2174 #ifdef CONFIG_IEEE80211R_AP
2175 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt))
2176 return wpa_auth_derive_ptk_ft(sm, pmk, ptk);
2177 #endif /* CONFIG_IEEE80211R_AP */
2178
2179 #ifdef CONFIG_DPP2
2180 if (sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP && sm->dpp_z) {
2181 z = wpabuf_head(sm->dpp_z);
2182 z_len = wpabuf_len(sm->dpp_z);
2183 }
2184 #endif /* CONFIG_DPP2 */
2185
2186 return wpa_pmk_to_ptk(pmk, pmk_len, "Pairwise key expansion",
2187 sm->wpa_auth->addr, sm->addr, sm->ANonce, snonce,
2188 ptk, sm->wpa_key_mgmt, sm->pairwise, z, z_len);
2189 }
2190
2191
2192 #ifdef CONFIG_FILS
2193
fils_auth_pmk_to_ptk(struct wpa_state_machine * sm,const u8 * pmk,size_t pmk_len,const u8 * snonce,const u8 * anonce,const u8 * dhss,size_t dhss_len,struct wpabuf * g_sta,struct wpabuf * g_ap)2194 int fils_auth_pmk_to_ptk(struct wpa_state_machine *sm, const u8 *pmk,
2195 size_t pmk_len, const u8 *snonce, const u8 *anonce,
2196 const u8 *dhss, size_t dhss_len,
2197 struct wpabuf *g_sta, struct wpabuf *g_ap)
2198 {
2199 u8 ick[FILS_ICK_MAX_LEN];
2200 size_t ick_len;
2201 int res;
2202 u8 fils_ft[FILS_FT_MAX_LEN];
2203 size_t fils_ft_len = 0;
2204
2205 res = fils_pmk_to_ptk(pmk, pmk_len, sm->addr, sm->wpa_auth->addr,
2206 snonce, anonce, dhss, dhss_len,
2207 &sm->PTK, ick, &ick_len,
2208 sm->wpa_key_mgmt, sm->pairwise,
2209 fils_ft, &fils_ft_len);
2210 if (res < 0)
2211 return res;
2212 sm->PTK_valid = TRUE;
2213 sm->tk_already_set = FALSE;
2214
2215 #ifdef CONFIG_IEEE80211R_AP
2216 if (fils_ft_len) {
2217 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2218 struct wpa_auth_config *conf = &wpa_auth->conf;
2219 u8 pmk_r0[PMK_LEN_MAX], pmk_r0_name[WPA_PMK_NAME_LEN];
2220 int use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
2221 size_t pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
2222
2223 if (wpa_derive_pmk_r0(fils_ft, fils_ft_len,
2224 conf->ssid, conf->ssid_len,
2225 conf->mobility_domain,
2226 conf->r0_key_holder,
2227 conf->r0_key_holder_len,
2228 sm->addr, pmk_r0, pmk_r0_name,
2229 use_sha384) < 0)
2230 return -1;
2231
2232 wpa_hexdump_key(MSG_DEBUG, "FILS+FT: PMK-R0",
2233 pmk_r0, pmk_r0_len);
2234 wpa_hexdump(MSG_DEBUG, "FILS+FT: PMKR0Name",
2235 pmk_r0_name, WPA_PMK_NAME_LEN);
2236 wpa_ft_store_pmk_fils(sm, pmk_r0, pmk_r0_name);
2237 os_memset(fils_ft, 0, sizeof(fils_ft));
2238
2239 res = wpa_derive_pmk_r1_name(pmk_r0_name, conf->r1_key_holder,
2240 sm->addr, sm->pmk_r1_name,
2241 use_sha384);
2242 os_memset(pmk_r0, 0, PMK_LEN_MAX);
2243 if (res < 0)
2244 return -1;
2245 wpa_hexdump(MSG_DEBUG, "FILS+FT: PMKR1Name", sm->pmk_r1_name,
2246 WPA_PMK_NAME_LEN);
2247 sm->pmk_r1_name_valid = 1;
2248 }
2249 #endif /* CONFIG_IEEE80211R_AP */
2250
2251 res = fils_key_auth_sk(ick, ick_len, snonce, anonce,
2252 sm->addr, sm->wpa_auth->addr,
2253 g_sta ? wpabuf_head(g_sta) : NULL,
2254 g_sta ? wpabuf_len(g_sta) : 0,
2255 g_ap ? wpabuf_head(g_ap) : NULL,
2256 g_ap ? wpabuf_len(g_ap) : 0,
2257 sm->wpa_key_mgmt, sm->fils_key_auth_sta,
2258 sm->fils_key_auth_ap,
2259 &sm->fils_key_auth_len);
2260 os_memset(ick, 0, sizeof(ick));
2261
2262 /* Store nonces for (Re)Association Request/Response frame processing */
2263 os_memcpy(sm->SNonce, snonce, FILS_NONCE_LEN);
2264 os_memcpy(sm->ANonce, anonce, FILS_NONCE_LEN);
2265
2266 return res;
2267 }
2268
2269
wpa_aead_decrypt(struct wpa_state_machine * sm,struct wpa_ptk * ptk,u8 * buf,size_t buf_len,u16 * _key_data_len)2270 static int wpa_aead_decrypt(struct wpa_state_machine *sm, struct wpa_ptk *ptk,
2271 u8 *buf, size_t buf_len, u16 *_key_data_len)
2272 {
2273 struct ieee802_1x_hdr *hdr;
2274 struct wpa_eapol_key *key;
2275 u8 *pos;
2276 u16 key_data_len;
2277 u8 *tmp;
2278 const u8 *aad[1];
2279 size_t aad_len[1];
2280
2281 hdr = (struct ieee802_1x_hdr *) buf;
2282 key = (struct wpa_eapol_key *) (hdr + 1);
2283 pos = (u8 *) (key + 1);
2284 key_data_len = WPA_GET_BE16(pos);
2285 if (key_data_len < AES_BLOCK_SIZE ||
2286 key_data_len > buf_len - sizeof(*hdr) - sizeof(*key) - 2) {
2287 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2288 "No room for AES-SIV data in the frame");
2289 return -1;
2290 }
2291 pos += 2; /* Pointing at the Encrypted Key Data field */
2292
2293 tmp = os_malloc(key_data_len);
2294 if (!tmp)
2295 return -1;
2296
2297 /* AES-SIV AAD from EAPOL protocol version field (inclusive) to
2298 * to Key Data (exclusive). */
2299 aad[0] = buf;
2300 aad_len[0] = pos - buf;
2301 if (aes_siv_decrypt(ptk->kek, ptk->kek_len, pos, key_data_len,
2302 1, aad, aad_len, tmp) < 0) {
2303 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
2304 "Invalid AES-SIV data in the frame");
2305 bin_clear_free(tmp, key_data_len);
2306 return -1;
2307 }
2308
2309 /* AEAD decryption and validation completed successfully */
2310 key_data_len -= AES_BLOCK_SIZE;
2311 wpa_hexdump_key(MSG_DEBUG, "WPA: Decrypted Key Data",
2312 tmp, key_data_len);
2313
2314 /* Replace Key Data field with the decrypted version */
2315 os_memcpy(pos, tmp, key_data_len);
2316 pos -= 2; /* Key Data Length field */
2317 WPA_PUT_BE16(pos, key_data_len);
2318 bin_clear_free(tmp, key_data_len);
2319 if (_key_data_len)
2320 *_key_data_len = key_data_len;
2321 return 0;
2322 }
2323
2324
wpa_fils_validate_fils_session(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len,const u8 * fils_session)2325 const u8 * wpa_fils_validate_fils_session(struct wpa_state_machine *sm,
2326 const u8 *ies, size_t ies_len,
2327 const u8 *fils_session)
2328 {
2329 const u8 *ie, *end;
2330 const u8 *session = NULL;
2331
2332 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2333 wpa_printf(MSG_DEBUG,
2334 "FILS: Not a FILS AKM - reject association");
2335 return NULL;
2336 }
2337
2338 /* Verify Session element */
2339 ie = ies;
2340 end = ((const u8 *) ie) + ies_len;
2341 while (ie + 1 < end) {
2342 if (ie + 2 + ie[1] > end)
2343 break;
2344 if (ie[0] == WLAN_EID_EXTENSION &&
2345 ie[1] >= 1 + FILS_SESSION_LEN &&
2346 ie[2] == WLAN_EID_EXT_FILS_SESSION) {
2347 session = ie;
2348 break;
2349 }
2350 ie += 2 + ie[1];
2351 }
2352
2353 if (!session) {
2354 wpa_printf(MSG_DEBUG,
2355 "FILS: %s: Could not find FILS Session element in Assoc Req - reject",
2356 __func__);
2357 return NULL;
2358 }
2359
2360 if (!fils_session) {
2361 wpa_printf(MSG_DEBUG,
2362 "FILS: %s: Could not find FILS Session element in STA entry - reject",
2363 __func__);
2364 return NULL;
2365 }
2366
2367 if (os_memcmp(fils_session, session + 3, FILS_SESSION_LEN) != 0) {
2368 wpa_printf(MSG_DEBUG, "FILS: Session mismatch");
2369 wpa_hexdump(MSG_DEBUG, "FILS: Expected FILS Session",
2370 fils_session, FILS_SESSION_LEN);
2371 wpa_hexdump(MSG_DEBUG, "FILS: Received FILS Session",
2372 session + 3, FILS_SESSION_LEN);
2373 return NULL;
2374 }
2375 return session;
2376 }
2377
2378
wpa_fils_validate_key_confirm(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)2379 int wpa_fils_validate_key_confirm(struct wpa_state_machine *sm, const u8 *ies,
2380 size_t ies_len)
2381 {
2382 struct ieee802_11_elems elems;
2383
2384 if (ieee802_11_parse_elems(ies, ies_len, &elems, 1) == ParseFailed) {
2385 wpa_printf(MSG_DEBUG,
2386 "FILS: Failed to parse decrypted elements");
2387 return -1;
2388 }
2389
2390 if (!elems.fils_session) {
2391 wpa_printf(MSG_DEBUG, "FILS: No FILS Session element");
2392 return -1;
2393 }
2394
2395 if (!elems.fils_key_confirm) {
2396 wpa_printf(MSG_DEBUG, "FILS: No FILS Key Confirm element");
2397 return -1;
2398 }
2399
2400 if (elems.fils_key_confirm_len != sm->fils_key_auth_len) {
2401 wpa_printf(MSG_DEBUG,
2402 "FILS: Unexpected Key-Auth length %d (expected %d)",
2403 elems.fils_key_confirm_len,
2404 (int) sm->fils_key_auth_len);
2405 return -1;
2406 }
2407
2408 if (os_memcmp(elems.fils_key_confirm, sm->fils_key_auth_sta,
2409 sm->fils_key_auth_len) != 0) {
2410 wpa_printf(MSG_DEBUG, "FILS: Key-Auth mismatch");
2411 wpa_hexdump(MSG_DEBUG, "FILS: Received Key-Auth",
2412 elems.fils_key_confirm, elems.fils_key_confirm_len);
2413 wpa_hexdump(MSG_DEBUG, "FILS: Expected Key-Auth",
2414 sm->fils_key_auth_sta, sm->fils_key_auth_len);
2415 return -1;
2416 }
2417
2418 return 0;
2419 }
2420
2421
fils_decrypt_assoc(struct wpa_state_machine * sm,const u8 * fils_session,const struct ieee80211_mgmt * mgmt,size_t frame_len,u8 * pos,size_t left)2422 int fils_decrypt_assoc(struct wpa_state_machine *sm, const u8 *fils_session,
2423 const struct ieee80211_mgmt *mgmt, size_t frame_len,
2424 u8 *pos, size_t left)
2425 {
2426 u16 fc, stype;
2427 const u8 *end, *ie_start, *ie, *session, *crypt;
2428 const u8 *aad[5];
2429 size_t aad_len[5];
2430
2431 if (!sm || !sm->PTK_valid) {
2432 wpa_printf(MSG_DEBUG,
2433 "FILS: No KEK to decrypt Assocication Request frame");
2434 return -1;
2435 }
2436
2437 if (!wpa_key_mgmt_fils(sm->wpa_key_mgmt)) {
2438 wpa_printf(MSG_DEBUG,
2439 "FILS: Not a FILS AKM - reject association");
2440 return -1;
2441 }
2442
2443 end = ((const u8 *) mgmt) + frame_len;
2444 fc = le_to_host16(mgmt->frame_control);
2445 stype = WLAN_FC_GET_STYPE(fc);
2446 if (stype == WLAN_FC_STYPE_REASSOC_REQ)
2447 ie_start = mgmt->u.reassoc_req.variable;
2448 else
2449 ie_start = mgmt->u.assoc_req.variable;
2450 ie = ie_start;
2451
2452 /*
2453 * Find FILS Session element which is the last unencrypted element in
2454 * the frame.
2455 */
2456 session = wpa_fils_validate_fils_session(sm, ie, end - ie,
2457 fils_session);
2458 if (!session) {
2459 wpa_printf(MSG_DEBUG, "FILS: Session validation failed");
2460 return -1;
2461 }
2462
2463 crypt = session + 2 + session[1];
2464
2465 if (end - crypt < AES_BLOCK_SIZE) {
2466 wpa_printf(MSG_DEBUG,
2467 "FILS: Too short frame to include AES-SIV data");
2468 return -1;
2469 }
2470
2471 /* AES-SIV AAD vectors */
2472
2473 /* The STA's MAC address */
2474 aad[0] = mgmt->sa;
2475 aad_len[0] = ETH_ALEN;
2476 /* The AP's BSSID */
2477 aad[1] = mgmt->da;
2478 aad_len[1] = ETH_ALEN;
2479 /* The STA's nonce */
2480 aad[2] = sm->SNonce;
2481 aad_len[2] = FILS_NONCE_LEN;
2482 /* The AP's nonce */
2483 aad[3] = sm->ANonce;
2484 aad_len[3] = FILS_NONCE_LEN;
2485 /*
2486 * The (Re)Association Request frame from the Capability Information
2487 * field to the FILS Session element (both inclusive).
2488 */
2489 aad[4] = (const u8 *) &mgmt->u.assoc_req.capab_info;
2490 aad_len[4] = crypt - aad[4];
2491
2492 if (aes_siv_decrypt(sm->PTK.kek, sm->PTK.kek_len, crypt, end - crypt,
2493 5, aad, aad_len, pos + (crypt - ie_start)) < 0) {
2494 wpa_printf(MSG_DEBUG,
2495 "FILS: Invalid AES-SIV data in the frame");
2496 return -1;
2497 }
2498 wpa_hexdump(MSG_DEBUG, "FILS: Decrypted Association Request elements",
2499 pos, left - AES_BLOCK_SIZE);
2500
2501 if (wpa_fils_validate_key_confirm(sm, pos, left - AES_BLOCK_SIZE) < 0) {
2502 wpa_printf(MSG_DEBUG, "FILS: Key Confirm validation failed");
2503 return -1;
2504 }
2505
2506 return left - AES_BLOCK_SIZE;
2507 }
2508
2509
fils_encrypt_assoc(struct wpa_state_machine * sm,u8 * buf,size_t current_len,size_t max_len,const struct wpabuf * hlp)2510 int fils_encrypt_assoc(struct wpa_state_machine *sm, u8 *buf,
2511 size_t current_len, size_t max_len,
2512 const struct wpabuf *hlp)
2513 {
2514 u8 *end = buf + max_len;
2515 u8 *pos = buf + current_len;
2516 struct ieee80211_mgmt *mgmt;
2517 struct wpabuf *plain;
2518 const u8 *aad[5];
2519 size_t aad_len[5];
2520
2521 if (!sm || !sm->PTK_valid)
2522 return -1;
2523
2524 wpa_hexdump(MSG_DEBUG,
2525 "FILS: Association Response frame before FILS processing",
2526 buf, current_len);
2527
2528 mgmt = (struct ieee80211_mgmt *) buf;
2529
2530 /* AES-SIV AAD vectors */
2531
2532 /* The AP's BSSID */
2533 aad[0] = mgmt->sa;
2534 aad_len[0] = ETH_ALEN;
2535 /* The STA's MAC address */
2536 aad[1] = mgmt->da;
2537 aad_len[1] = ETH_ALEN;
2538 /* The AP's nonce */
2539 aad[2] = sm->ANonce;
2540 aad_len[2] = FILS_NONCE_LEN;
2541 /* The STA's nonce */
2542 aad[3] = sm->SNonce;
2543 aad_len[3] = FILS_NONCE_LEN;
2544 /*
2545 * The (Re)Association Response frame from the Capability Information
2546 * field (the same offset in both Association and Reassociation
2547 * Response frames) to the FILS Session element (both inclusive).
2548 */
2549 aad[4] = (const u8 *) &mgmt->u.assoc_resp.capab_info;
2550 aad_len[4] = pos - aad[4];
2551
2552 /* The following elements will be encrypted with AES-SIV */
2553 plain = fils_prepare_plainbuf(sm, hlp);
2554 if (!plain) {
2555 wpa_printf(MSG_DEBUG, "FILS: Plain buffer prep failed");
2556 return -1;
2557 }
2558
2559 if (pos + wpabuf_len(plain) + AES_BLOCK_SIZE > end) {
2560 wpa_printf(MSG_DEBUG,
2561 "FILS: Not enough room for FILS elements");
2562 wpabuf_free(plain);
2563 return -1;
2564 }
2565
2566 wpa_hexdump_buf_key(MSG_DEBUG, "FILS: Association Response plaintext",
2567 plain);
2568
2569 if (aes_siv_encrypt(sm->PTK.kek, sm->PTK.kek_len,
2570 wpabuf_head(plain), wpabuf_len(plain),
2571 5, aad, aad_len, pos) < 0) {
2572 wpabuf_free(plain);
2573 return -1;
2574 }
2575
2576 wpa_hexdump(MSG_DEBUG,
2577 "FILS: Encrypted Association Response elements",
2578 pos, AES_BLOCK_SIZE + wpabuf_len(plain));
2579 current_len += wpabuf_len(plain) + AES_BLOCK_SIZE;
2580 wpabuf_free(plain);
2581
2582 sm->fils_completed = 1;
2583
2584 return current_len;
2585 }
2586
2587
fils_prepare_plainbuf(struct wpa_state_machine * sm,const struct wpabuf * hlp)2588 static struct wpabuf * fils_prepare_plainbuf(struct wpa_state_machine *sm,
2589 const struct wpabuf *hlp)
2590 {
2591 struct wpabuf *plain;
2592 u8 *len, *tmp, *tmp2;
2593 u8 hdr[2];
2594 u8 *gtk, dummy_gtk[32];
2595 size_t gtk_len;
2596 struct wpa_group *gsm;
2597
2598 plain = wpabuf_alloc(1000);
2599 if (!plain)
2600 return NULL;
2601
2602 /* TODO: FILS Public Key */
2603
2604 /* FILS Key Confirmation */
2605 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2606 wpabuf_put_u8(plain, 1 + sm->fils_key_auth_len); /* Length */
2607 /* Element ID Extension */
2608 wpabuf_put_u8(plain, WLAN_EID_EXT_FILS_KEY_CONFIRM);
2609 wpabuf_put_data(plain, sm->fils_key_auth_ap, sm->fils_key_auth_len);
2610
2611 /* FILS HLP Container */
2612 if (hlp)
2613 wpabuf_put_buf(plain, hlp);
2614
2615 /* TODO: FILS IP Address Assignment */
2616
2617 /* Key Delivery */
2618 gsm = sm->group;
2619 wpabuf_put_u8(plain, WLAN_EID_EXTENSION); /* Element ID */
2620 len = wpabuf_put(plain, 1);
2621 wpabuf_put_u8(plain, WLAN_EID_EXT_KEY_DELIVERY);
2622 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN,
2623 wpabuf_put(plain, WPA_KEY_RSC_LEN));
2624 /* GTK KDE */
2625 gtk = gsm->GTK[gsm->GN - 1];
2626 gtk_len = gsm->GTK_len;
2627 if (sm->wpa_auth->conf.disable_gtk ||
2628 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
2629 /*
2630 * Provide unique random GTK to each STA to prevent use
2631 * of GTK in the BSS.
2632 */
2633 if (random_get_bytes(dummy_gtk, gtk_len) < 0) {
2634 wpabuf_free(plain);
2635 return NULL;
2636 }
2637 gtk = dummy_gtk;
2638 }
2639 hdr[0] = gsm->GN & 0x03;
2640 hdr[1] = 0;
2641 tmp = wpabuf_put(plain, 0);
2642 tmp2 = wpa_add_kde(tmp, RSN_KEY_DATA_GROUPKEY, hdr, 2,
2643 gtk, gtk_len);
2644 wpabuf_put(plain, tmp2 - tmp);
2645
2646 /* IGTK KDE */
2647 tmp = wpabuf_put(plain, 0);
2648 tmp2 = ieee80211w_kde_add(sm, tmp);
2649 wpabuf_put(plain, tmp2 - tmp);
2650
2651 *len = (u8 *) wpabuf_put(plain, 0) - len - 1;
2652
2653 #ifdef CONFIG_OCV
2654 if (wpa_auth_uses_ocv(sm)) {
2655 struct wpa_channel_info ci;
2656 u8 *pos;
2657
2658 if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
2659 wpa_printf(MSG_WARNING,
2660 "FILS: Failed to get channel info for OCI element");
2661 wpabuf_free(plain);
2662 return NULL;
2663 }
2664
2665 pos = wpabuf_put(plain, OCV_OCI_EXTENDED_LEN);
2666 if (ocv_insert_extended_oci(&ci, pos) < 0) {
2667 wpabuf_free(plain);
2668 return NULL;
2669 }
2670 }
2671 #endif /* CONFIG_OCV */
2672
2673 return plain;
2674 }
2675
2676
fils_set_tk(struct wpa_state_machine * sm)2677 int fils_set_tk(struct wpa_state_machine *sm)
2678 {
2679 enum wpa_alg alg;
2680 int klen;
2681
2682 if (!sm || !sm->PTK_valid) {
2683 wpa_printf(MSG_DEBUG, "FILS: No valid PTK available to set TK");
2684 return -1;
2685 }
2686 if (sm->tk_already_set) {
2687 wpa_printf(MSG_DEBUG, "FILS: TK already set to the driver");
2688 return -1;
2689 }
2690
2691 alg = wpa_cipher_to_alg(sm->pairwise);
2692 klen = wpa_cipher_key_len(sm->pairwise);
2693
2694 wpa_printf(MSG_DEBUG, "FILS: Configure TK to the driver");
2695 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
2696 sm->PTK.tk, klen)) {
2697 wpa_printf(MSG_DEBUG, "FILS: Failed to set TK to the driver");
2698 return -1;
2699 }
2700 sm->tk_already_set = TRUE;
2701
2702 return 0;
2703 }
2704
2705
hostapd_eid_assoc_fils_session(struct wpa_state_machine * sm,u8 * buf,const u8 * fils_session,struct wpabuf * hlp)2706 u8 * hostapd_eid_assoc_fils_session(struct wpa_state_machine *sm, u8 *buf,
2707 const u8 *fils_session, struct wpabuf *hlp)
2708 {
2709 struct wpabuf *plain;
2710 u8 *pos = buf;
2711
2712 /* FILS Session */
2713 *pos++ = WLAN_EID_EXTENSION; /* Element ID */
2714 *pos++ = 1 + FILS_SESSION_LEN; /* Length */
2715 *pos++ = WLAN_EID_EXT_FILS_SESSION; /* Element ID Extension */
2716 os_memcpy(pos, fils_session, FILS_SESSION_LEN);
2717 pos += FILS_SESSION_LEN;
2718
2719 plain = fils_prepare_plainbuf(sm, hlp);
2720 if (!plain) {
2721 wpa_printf(MSG_DEBUG, "FILS: Plain buffer prep failed");
2722 return NULL;
2723 }
2724
2725 os_memcpy(pos, wpabuf_head(plain), wpabuf_len(plain));
2726 pos += wpabuf_len(plain);
2727
2728 wpa_printf(MSG_DEBUG, "%s: plain buf_len: %u", __func__,
2729 (unsigned int) wpabuf_len(plain));
2730 wpabuf_free(plain);
2731 sm->fils_completed = 1;
2732 return pos;
2733 }
2734
2735 #endif /* CONFIG_FILS */
2736
2737
2738 #ifdef CONFIG_OCV
get_sta_tx_parameters(struct wpa_state_machine * sm,int ap_max_chanwidth,int ap_seg1_idx,int * bandwidth,int * seg1_idx)2739 int get_sta_tx_parameters(struct wpa_state_machine *sm, int ap_max_chanwidth,
2740 int ap_seg1_idx, int *bandwidth, int *seg1_idx)
2741 {
2742 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2743
2744 if (!wpa_auth->cb->get_sta_tx_params)
2745 return -1;
2746 return wpa_auth->cb->get_sta_tx_params(wpa_auth->cb_ctx, sm->addr,
2747 ap_max_chanwidth, ap_seg1_idx,
2748 bandwidth, seg1_idx);
2749 }
2750 #endif /* CONFIG_OCV */
2751
2752
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING)2753 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
2754 {
2755 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
2756 struct wpa_ptk PTK;
2757 int ok = 0, psk_found = 0;
2758 const u8 *pmk = NULL;
2759 size_t pmk_len;
2760 int ft;
2761 const u8 *eapol_key_ie, *key_data, *mic;
2762 u16 key_data_length;
2763 size_t mic_len, eapol_key_ie_len;
2764 struct ieee802_1x_hdr *hdr;
2765 struct wpa_eapol_key *key;
2766 struct wpa_eapol_ie_parse kde;
2767 int vlan_id = 0;
2768
2769 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk);
2770 sm->EAPOLKeyReceived = FALSE;
2771 sm->update_snonce = FALSE;
2772 os_memset(&PTK, 0, sizeof(PTK));
2773
2774 mic_len = wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len);
2775
2776 /* WPA with IEEE 802.1X: use the derived PMK from EAP
2777 * WPA-PSK: iterate through possible PSKs and select the one matching
2778 * the packet */
2779 for (;;) {
2780 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) &&
2781 !wpa_key_mgmt_sae(sm->wpa_key_mgmt)) {
2782 pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr,
2783 sm->p2p_dev_addr, pmk, &pmk_len,
2784 &vlan_id);
2785 if (pmk == NULL)
2786 break;
2787 psk_found = 1;
2788 #ifdef CONFIG_IEEE80211R_AP
2789 if (wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
2790 os_memcpy(sm->xxkey, pmk, pmk_len);
2791 sm->xxkey_len = pmk_len;
2792 }
2793 #endif /* CONFIG_IEEE80211R_AP */
2794 } else {
2795 pmk = sm->PMK;
2796 pmk_len = sm->pmk_len;
2797 }
2798
2799 if (wpa_derive_ptk(sm, sm->SNonce, pmk, pmk_len, &PTK) < 0)
2800 break;
2801
2802 if (mic_len &&
2803 wpa_verify_key_mic(sm->wpa_key_mgmt, pmk_len, &PTK,
2804 sm->last_rx_eapol_key,
2805 sm->last_rx_eapol_key_len) == 0) {
2806 if (sm->PMK != pmk) {
2807 os_memcpy(sm->PMK, pmk, pmk_len);
2808 sm->pmk_len = pmk_len;
2809 }
2810 ok = 1;
2811 break;
2812 }
2813
2814 #ifdef CONFIG_FILS
2815 if (!mic_len &&
2816 wpa_aead_decrypt(sm, &PTK, sm->last_rx_eapol_key,
2817 sm->last_rx_eapol_key_len, NULL) == 0) {
2818 ok = 1;
2819 break;
2820 }
2821 #endif /* CONFIG_FILS */
2822
2823 if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) ||
2824 wpa_key_mgmt_sae(sm->wpa_key_mgmt))
2825 break;
2826 }
2827
2828 if (!ok) {
2829 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2830 "invalid MIC in msg 2/4 of 4-Way Handshake");
2831 if (psk_found)
2832 wpa_auth_psk_failure_report(sm->wpa_auth, sm->addr);
2833 return;
2834 }
2835
2836 /*
2837 * Note: last_rx_eapol_key length fields have already been validated in
2838 * wpa_receive().
2839 */
2840 hdr = (struct ieee802_1x_hdr *) sm->last_rx_eapol_key;
2841 key = (struct wpa_eapol_key *) (hdr + 1);
2842 mic = (u8 *) (key + 1);
2843 key_data = mic + mic_len + 2;
2844 key_data_length = WPA_GET_BE16(mic + mic_len);
2845 if (key_data_length > sm->last_rx_eapol_key_len - sizeof(*hdr) -
2846 sizeof(*key) - mic_len - 2)
2847 return;
2848
2849 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
2850 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
2851 "received EAPOL-Key msg 2/4 with invalid Key Data contents");
2852 return;
2853 }
2854 if (kde.rsn_ie) {
2855 eapol_key_ie = kde.rsn_ie;
2856 eapol_key_ie_len = kde.rsn_ie_len;
2857 } else if (kde.osen) {
2858 eapol_key_ie = kde.osen;
2859 eapol_key_ie_len = kde.osen_len;
2860 } else {
2861 eapol_key_ie = kde.wpa_ie;
2862 eapol_key_ie_len = kde.wpa_ie_len;
2863 }
2864 ft = sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt);
2865 if (sm->wpa_ie == NULL ||
2866 wpa_compare_rsn_ie(ft, sm->wpa_ie, sm->wpa_ie_len,
2867 eapol_key_ie, eapol_key_ie_len)) {
2868 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2869 "WPA IE from (Re)AssocReq did not match with msg 2/4");
2870 if (sm->wpa_ie) {
2871 wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq",
2872 sm->wpa_ie, sm->wpa_ie_len);
2873 }
2874 wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4",
2875 eapol_key_ie, eapol_key_ie_len);
2876 /* MLME-DEAUTHENTICATE.request */
2877 wpa_sta_disconnect(wpa_auth, sm->addr,
2878 WLAN_REASON_PREV_AUTH_NOT_VALID);
2879 return;
2880 }
2881 #ifdef CONFIG_OCV
2882 if (wpa_auth_uses_ocv(sm)) {
2883 struct wpa_channel_info ci;
2884 int tx_chanwidth;
2885 int tx_seg1_idx;
2886
2887 if (wpa_channel_info(wpa_auth, &ci) != 0) {
2888 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2889 "Failed to get channel info to validate received OCI in EAPOL-Key 2/4");
2890 return;
2891 }
2892
2893 if (get_sta_tx_parameters(sm,
2894 channel_width_to_int(ci.chanwidth),
2895 ci.seg1_idx, &tx_chanwidth,
2896 &tx_seg1_idx) < 0)
2897 return;
2898
2899 if (ocv_verify_tx_params(kde.oci, kde.oci_len, &ci,
2900 tx_chanwidth, tx_seg1_idx) != 0) {
2901 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
2902 ocv_errorstr);
2903 return;
2904 }
2905 }
2906 #endif /* CONFIG_OCV */
2907 #ifdef CONFIG_IEEE80211R_AP
2908 if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) {
2909 wpa_sta_disconnect(wpa_auth, sm->addr,
2910 WLAN_REASON_PREV_AUTH_NOT_VALID);
2911 return;
2912 }
2913 #endif /* CONFIG_IEEE80211R_AP */
2914 #ifdef CONFIG_P2P
2915 if (kde.ip_addr_req && kde.ip_addr_req[0] &&
2916 wpa_auth->ip_pool && WPA_GET_BE32(sm->ip_addr) == 0) {
2917 int idx;
2918 wpa_printf(MSG_DEBUG,
2919 "P2P: IP address requested in EAPOL-Key exchange");
2920 idx = bitfield_get_first_zero(wpa_auth->ip_pool);
2921 if (idx >= 0) {
2922 u32 start = WPA_GET_BE32(wpa_auth->conf.ip_addr_start);
2923 bitfield_set(wpa_auth->ip_pool, idx);
2924 WPA_PUT_BE32(sm->ip_addr, start + idx);
2925 wpa_printf(MSG_DEBUG,
2926 "P2P: Assigned IP address %u.%u.%u.%u to "
2927 MACSTR, sm->ip_addr[0], sm->ip_addr[1],
2928 sm->ip_addr[2], sm->ip_addr[3],
2929 MAC2STR(sm->addr));
2930 }
2931 }
2932 #endif /* CONFIG_P2P */
2933
2934 #ifdef CONFIG_IEEE80211R_AP
2935 if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
2936 /*
2937 * Verify that PMKR1Name from EAPOL-Key message 2/4 matches
2938 * with the value we derived.
2939 */
2940 if (os_memcmp_const(sm->sup_pmk_r1_name, sm->pmk_r1_name,
2941 WPA_PMK_NAME_LEN) != 0) {
2942 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
2943 "PMKR1Name mismatch in FT 4-way "
2944 "handshake");
2945 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from "
2946 "Supplicant",
2947 sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN);
2948 wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name",
2949 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
2950 return;
2951 }
2952 }
2953 #endif /* CONFIG_IEEE80211R_AP */
2954
2955 if (vlan_id && wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) &&
2956 wpa_auth_update_vlan(wpa_auth, sm->addr, vlan_id) < 0) {
2957 wpa_sta_disconnect(wpa_auth, sm->addr,
2958 WLAN_REASON_PREV_AUTH_NOT_VALID);
2959 return;
2960 }
2961
2962 sm->pending_1_of_4_timeout = 0;
2963 eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm);
2964
2965 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) {
2966 /* PSK may have changed from the previous choice, so update
2967 * state machine data based on whatever PSK was selected here.
2968 */
2969 os_memcpy(sm->PMK, pmk, PMK_LEN);
2970 sm->pmk_len = PMK_LEN;
2971 }
2972
2973 sm->MICVerified = TRUE;
2974
2975 os_memcpy(&sm->PTK, &PTK, sizeof(PTK));
2976 sm->PTK_valid = TRUE;
2977 }
2978
2979
SM_STATE(WPA_PTK,PTKCALCNEGOTIATING2)2980 SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2)
2981 {
2982 SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk);
2983 sm->TimeoutCtr = 0;
2984 }
2985
2986
2987 #ifdef CONFIG_IEEE80211W
2988
ieee80211w_kde_len(struct wpa_state_machine * sm)2989 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
2990 {
2991 if (sm->mgmt_frame_prot) {
2992 size_t len;
2993 len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
2994 return 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN + len;
2995 }
2996
2997 return 0;
2998 }
2999
3000
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)3001 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
3002 {
3003 struct wpa_igtk_kde igtk;
3004 struct wpa_group *gsm = sm->group;
3005 u8 rsc[WPA_KEY_RSC_LEN];
3006 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
3007
3008 if (!sm->mgmt_frame_prot)
3009 return pos;
3010
3011 igtk.keyid[0] = gsm->GN_igtk;
3012 igtk.keyid[1] = 0;
3013 if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE ||
3014 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, rsc) < 0)
3015 os_memset(igtk.pn, 0, sizeof(igtk.pn));
3016 else
3017 os_memcpy(igtk.pn, rsc, sizeof(igtk.pn));
3018 os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], len);
3019 if (sm->wpa_auth->conf.disable_gtk ||
3020 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
3021 /*
3022 * Provide unique random IGTK to each STA to prevent use of
3023 * IGTK in the BSS.
3024 */
3025 if (random_get_bytes(igtk.igtk, len) < 0)
3026 return pos;
3027 }
3028 pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK,
3029 (const u8 *) &igtk, WPA_IGTK_KDE_PREFIX_LEN + len,
3030 NULL, 0);
3031
3032 return pos;
3033 }
3034
3035 #else /* CONFIG_IEEE80211W */
3036
ieee80211w_kde_len(struct wpa_state_machine * sm)3037 static int ieee80211w_kde_len(struct wpa_state_machine *sm)
3038 {
3039 return 0;
3040 }
3041
3042
ieee80211w_kde_add(struct wpa_state_machine * sm,u8 * pos)3043 static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos)
3044 {
3045 return pos;
3046 }
3047
3048 #endif /* CONFIG_IEEE80211W */
3049
3050
ocv_oci_len(struct wpa_state_machine * sm)3051 static int ocv_oci_len(struct wpa_state_machine *sm)
3052 {
3053 #ifdef CONFIG_OCV
3054 if (wpa_auth_uses_ocv(sm))
3055 return OCV_OCI_KDE_LEN;
3056 #endif /* CONFIG_OCV */
3057 return 0;
3058 }
3059
ocv_oci_add(struct wpa_state_machine * sm,u8 ** argpos)3060 static int ocv_oci_add(struct wpa_state_machine *sm, u8 **argpos)
3061 {
3062 #ifdef CONFIG_OCV
3063 struct wpa_channel_info ci;
3064
3065 if (!wpa_auth_uses_ocv(sm))
3066 return 0;
3067
3068 if (wpa_channel_info(sm->wpa_auth, &ci) != 0) {
3069 wpa_printf(MSG_WARNING,
3070 "Failed to get channel info for OCI element");
3071 return -1;
3072 }
3073
3074 return ocv_insert_oci_kde(&ci, argpos);
3075 #else /* CONFIG_OCV */
3076 return 0;
3077 #endif /* CONFIG_OCV */
3078 }
3079
3080
SM_STATE(WPA_PTK,PTKINITNEGOTIATING)3081 SM_STATE(WPA_PTK, PTKINITNEGOTIATING)
3082 {
3083 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32];
3084 size_t gtk_len, kde_len;
3085 struct wpa_group *gsm = sm->group;
3086 u8 *wpa_ie;
3087 int wpa_ie_len, secure, keyidx, encr = 0;
3088
3089 SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk);
3090 sm->TimeoutEvt = FALSE;
3091
3092 sm->TimeoutCtr++;
3093 if (sm->wpa_auth->conf.wpa_disable_eapol_key_retries &&
3094 sm->TimeoutCtr > 1) {
3095 /* Do not allow retransmission of EAPOL-Key msg 3/4 */
3096 return;
3097 }
3098 if (sm->TimeoutCtr > sm->wpa_auth->conf.wpa_pairwise_update_count) {
3099 /* No point in sending the EAPOL-Key - we will disconnect
3100 * immediately following this. */
3101 return;
3102 }
3103
3104 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
3105 GTK[GN], IGTK, [FTIE], [TIE * 2])
3106 */
3107 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
3108 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
3109 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
3110 wpa_ie = sm->wpa_auth->wpa_ie;
3111 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
3112 if (sm->wpa == WPA_VERSION_WPA &&
3113 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
3114 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
3115 /* WPA-only STA, remove RSN IE and possible MDIE */
3116 wpa_ie = wpa_ie + wpa_ie[1] + 2;
3117 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
3118 wpa_ie = wpa_ie + wpa_ie[1] + 2;
3119 wpa_ie_len = wpa_ie[1] + 2;
3120 }
3121 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3122 "sending 3/4 msg of 4-Way Handshake");
3123 if (sm->wpa == WPA_VERSION_WPA2) {
3124 /* WPA2 send GTK in the 4-way handshake */
3125 secure = 1;
3126 gtk = gsm->GTK[gsm->GN - 1];
3127 gtk_len = gsm->GTK_len;
3128 if (sm->wpa_auth->conf.disable_gtk ||
3129 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
3130 /*
3131 * Provide unique random GTK to each STA to prevent use
3132 * of GTK in the BSS.
3133 */
3134 if (random_get_bytes(dummy_gtk, gtk_len) < 0)
3135 return;
3136 gtk = dummy_gtk;
3137 }
3138 keyidx = gsm->GN;
3139 _rsc = rsc;
3140 encr = 1;
3141 } else {
3142 /* WPA does not include GTK in msg 3/4 */
3143 secure = 0;
3144 gtk = NULL;
3145 gtk_len = 0;
3146 keyidx = 0;
3147 _rsc = NULL;
3148 if (sm->rx_eapol_key_secure) {
3149 /*
3150 * It looks like Windows 7 supplicant tries to use
3151 * Secure bit in msg 2/4 after having reported Michael
3152 * MIC failure and it then rejects the 4-way handshake
3153 * if msg 3/4 does not set Secure bit. Work around this
3154 * by setting the Secure bit here even in the case of
3155 * WPA if the supplicant used it first.
3156 */
3157 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3158 "STA used Secure bit in WPA msg 2/4 - "
3159 "set Secure for 3/4 as workaround");
3160 secure = 1;
3161 }
3162 }
3163
3164 kde_len = wpa_ie_len + ieee80211w_kde_len(sm) + ocv_oci_len(sm);
3165 if (gtk)
3166 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
3167 #ifdef CONFIG_IEEE80211R_AP
3168 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
3169 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
3170 kde_len += 300; /* FTIE + 2 * TIE */
3171 }
3172 #endif /* CONFIG_IEEE80211R_AP */
3173 #ifdef CONFIG_P2P
3174 if (WPA_GET_BE32(sm->ip_addr) > 0)
3175 kde_len += 2 + RSN_SELECTOR_LEN + 3 * 4;
3176 #endif /* CONFIG_P2P */
3177 kde = os_malloc(kde_len);
3178 if (kde == NULL)
3179 return;
3180
3181 pos = kde;
3182 os_memcpy(pos, wpa_ie, wpa_ie_len);
3183 pos += wpa_ie_len;
3184 #ifdef CONFIG_IEEE80211R_AP
3185 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
3186 int res;
3187 size_t elen;
3188
3189 elen = pos - kde;
3190 res = wpa_insert_pmkid(kde, &elen, sm->pmk_r1_name);
3191 if (res < 0) {
3192 wpa_printf(MSG_ERROR, "FT: Failed to insert "
3193 "PMKR1Name into RSN IE in EAPOL-Key data");
3194 os_free(kde);
3195 return;
3196 }
3197 pos -= wpa_ie_len;
3198 pos += elen;
3199 }
3200 #endif /* CONFIG_IEEE80211R_AP */
3201 if (gtk) {
3202 u8 hdr[2];
3203 hdr[0] = keyidx & 0x03;
3204 hdr[1] = 0;
3205 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
3206 gtk, gtk_len);
3207 }
3208 pos = ieee80211w_kde_add(sm, pos);
3209 if (ocv_oci_add(sm, &pos) < 0) {
3210 os_free(kde);
3211 return;
3212 }
3213
3214 #ifdef CONFIG_IEEE80211R_AP
3215 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
3216 int res;
3217 struct wpa_auth_config *conf;
3218
3219 conf = &sm->wpa_auth->conf;
3220 if (sm->assoc_resp_ftie &&
3221 kde + kde_len - pos >= 2 + sm->assoc_resp_ftie[1]) {
3222 os_memcpy(pos, sm->assoc_resp_ftie,
3223 2 + sm->assoc_resp_ftie[1]);
3224 res = 2 + sm->assoc_resp_ftie[1];
3225 } else {
3226 int use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
3227
3228 res = wpa_write_ftie(conf, use_sha384,
3229 conf->r0_key_holder,
3230 conf->r0_key_holder_len,
3231 NULL, NULL, pos,
3232 kde + kde_len - pos,
3233 NULL, 0);
3234 }
3235 if (res < 0) {
3236 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
3237 "into EAPOL-Key Key Data");
3238 os_free(kde);
3239 return;
3240 }
3241 pos += res;
3242
3243 /* TIE[ReassociationDeadline] (TU) */
3244 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
3245 *pos++ = 5;
3246 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
3247 WPA_PUT_LE32(pos, conf->reassociation_deadline);
3248 pos += 4;
3249
3250 /* TIE[KeyLifetime] (seconds) */
3251 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
3252 *pos++ = 5;
3253 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
3254 WPA_PUT_LE32(pos, conf->r0_key_lifetime);
3255 pos += 4;
3256 }
3257 #endif /* CONFIG_IEEE80211R_AP */
3258 #ifdef CONFIG_P2P
3259 if (WPA_GET_BE32(sm->ip_addr) > 0) {
3260 u8 addr[3 * 4];
3261 os_memcpy(addr, sm->ip_addr, 4);
3262 os_memcpy(addr + 4, sm->wpa_auth->conf.ip_addr_mask, 4);
3263 os_memcpy(addr + 8, sm->wpa_auth->conf.ip_addr_go, 4);
3264 pos = wpa_add_kde(pos, WFA_KEY_DATA_IP_ADDR_ALLOC,
3265 addr, sizeof(addr), NULL, 0);
3266 }
3267 #endif /* CONFIG_P2P */
3268
3269 wpa_send_eapol(sm->wpa_auth, sm,
3270 (secure ? WPA_KEY_INFO_SECURE : 0) |
3271 (wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len) ?
3272 WPA_KEY_INFO_MIC : 0) |
3273 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
3274 WPA_KEY_INFO_KEY_TYPE,
3275 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
3276 os_free(kde);
3277 }
3278
3279
SM_STATE(WPA_PTK,PTKINITDONE)3280 SM_STATE(WPA_PTK, PTKINITDONE)
3281 {
3282 SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk);
3283 sm->EAPOLKeyReceived = FALSE;
3284 if (sm->Pair) {
3285 enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise);
3286 int klen = wpa_cipher_key_len(sm->pairwise);
3287 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
3288 sm->PTK.tk, klen)) {
3289 wpa_sta_disconnect(sm->wpa_auth, sm->addr,
3290 WLAN_REASON_PREV_AUTH_NOT_VALID);
3291 return;
3292 }
3293 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
3294 sm->pairwise_set = TRUE;
3295
3296 if (sm->wpa_auth->conf.wpa_ptk_rekey) {
3297 eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm);
3298 eloop_register_timeout(sm->wpa_auth->conf.
3299 wpa_ptk_rekey, 0, wpa_rekey_ptk,
3300 sm->wpa_auth, sm);
3301 }
3302
3303 if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) ||
3304 sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP ||
3305 sm->wpa_key_mgmt == WPA_KEY_MGMT_OWE) {
3306 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
3307 WPA_EAPOL_authorized, 1);
3308 }
3309 }
3310
3311 if (0 /* IBSS == TRUE */) {
3312 sm->keycount++;
3313 if (sm->keycount == 2) {
3314 wpa_auth_set_eapol(sm->wpa_auth, sm->addr,
3315 WPA_EAPOL_portValid, 1);
3316 }
3317 } else {
3318 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid,
3319 1);
3320 }
3321 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0);
3322 wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1);
3323 if (sm->wpa == WPA_VERSION_WPA)
3324 sm->PInitAKeys = TRUE;
3325 else
3326 sm->has_GTK = TRUE;
3327 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3328 "pairwise key handshake completed (%s)",
3329 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
3330
3331 #ifdef CONFIG_IEEE80211R_AP
3332 wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr);
3333 #endif /* CONFIG_IEEE80211R_AP */
3334 }
3335
3336
SM_STEP(WPA_PTK)3337 SM_STEP(WPA_PTK)
3338 {
3339 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
3340
3341 if (sm->Init)
3342 SM_ENTER(WPA_PTK, INITIALIZE);
3343 else if (sm->Disconnect
3344 /* || FIX: dot11RSNAConfigSALifetime timeout */) {
3345 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
3346 "WPA_PTK: sm->Disconnect");
3347 SM_ENTER(WPA_PTK, DISCONNECT);
3348 }
3349 else if (sm->DeauthenticationRequest)
3350 SM_ENTER(WPA_PTK, DISCONNECTED);
3351 else if (sm->AuthenticationRequest)
3352 SM_ENTER(WPA_PTK, AUTHENTICATION);
3353 else if (sm->ReAuthenticationRequest)
3354 SM_ENTER(WPA_PTK, AUTHENTICATION2);
3355 else if (sm->PTKRequest) {
3356 if (wpa_auth_sm_ptk_update(sm) < 0)
3357 SM_ENTER(WPA_PTK, DISCONNECTED);
3358 else
3359 SM_ENTER(WPA_PTK, PTKSTART);
3360 } else switch (sm->wpa_ptk_state) {
3361 case WPA_PTK_INITIALIZE:
3362 break;
3363 case WPA_PTK_DISCONNECT:
3364 SM_ENTER(WPA_PTK, DISCONNECTED);
3365 break;
3366 case WPA_PTK_DISCONNECTED:
3367 SM_ENTER(WPA_PTK, INITIALIZE);
3368 break;
3369 case WPA_PTK_AUTHENTICATION:
3370 SM_ENTER(WPA_PTK, AUTHENTICATION2);
3371 break;
3372 case WPA_PTK_AUTHENTICATION2:
3373 if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) &&
3374 wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
3375 WPA_EAPOL_keyRun) > 0)
3376 SM_ENTER(WPA_PTK, INITPMK);
3377 else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) ||
3378 sm->wpa_key_mgmt == WPA_KEY_MGMT_OWE
3379 /* FIX: && 802.1X::keyRun */)
3380 SM_ENTER(WPA_PTK, INITPSK);
3381 else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP)
3382 SM_ENTER(WPA_PTK, INITPMK);
3383 break;
3384 case WPA_PTK_INITPMK:
3385 if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr,
3386 WPA_EAPOL_keyAvailable) > 0) {
3387 SM_ENTER(WPA_PTK, PTKSTART);
3388 #ifdef CONFIG_DPP
3389 } else if (sm->wpa_key_mgmt == WPA_KEY_MGMT_DPP && sm->pmksa) {
3390 SM_ENTER(WPA_PTK, PTKSTART);
3391 #endif /* CONFIG_DPP */
3392 } else {
3393 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3394 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3395 "INITPMK - keyAvailable = false");
3396 SM_ENTER(WPA_PTK, DISCONNECT);
3397 }
3398 break;
3399 case WPA_PTK_INITPSK:
3400 if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, sm->p2p_dev_addr,
3401 NULL, NULL, NULL)) {
3402 SM_ENTER(WPA_PTK, PTKSTART);
3403 #ifdef CONFIG_SAE
3404 } else if (wpa_auth_uses_sae(sm) && sm->pmksa) {
3405 SM_ENTER(WPA_PTK, PTKSTART);
3406 #endif /* CONFIG_SAE */
3407 } else {
3408 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3409 "no PSK configured for the STA");
3410 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3411 SM_ENTER(WPA_PTK, DISCONNECT);
3412 }
3413 break;
3414 case WPA_PTK_PTKSTART:
3415 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3416 sm->EAPOLKeyPairwise)
3417 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3418 else if (sm->TimeoutCtr >
3419 sm->wpa_auth->conf.wpa_pairwise_update_count) {
3420 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3421 wpa_auth_vlogger(
3422 sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3423 "PTKSTART: Retry limit %u reached",
3424 sm->wpa_auth->conf.wpa_pairwise_update_count);
3425 SM_ENTER(WPA_PTK, DISCONNECT);
3426 } else if (sm->TimeoutEvt)
3427 SM_ENTER(WPA_PTK, PTKSTART);
3428 break;
3429 case WPA_PTK_PTKCALCNEGOTIATING:
3430 if (sm->MICVerified)
3431 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2);
3432 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3433 sm->EAPOLKeyPairwise)
3434 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3435 else if (sm->TimeoutEvt)
3436 SM_ENTER(WPA_PTK, PTKSTART);
3437 break;
3438 case WPA_PTK_PTKCALCNEGOTIATING2:
3439 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3440 break;
3441 case WPA_PTK_PTKINITNEGOTIATING:
3442 if (sm->update_snonce)
3443 SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING);
3444 else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3445 sm->EAPOLKeyPairwise && sm->MICVerified)
3446 SM_ENTER(WPA_PTK, PTKINITDONE);
3447 else if (sm->TimeoutCtr >
3448 sm->wpa_auth->conf.wpa_pairwise_update_count ||
3449 (sm->wpa_auth->conf.wpa_disable_eapol_key_retries &&
3450 sm->TimeoutCtr > 1)) {
3451 wpa_auth->dot11RSNA4WayHandshakeFailures++;
3452 wpa_auth_vlogger(
3453 sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3454 "PTKINITNEGOTIATING: Retry limit %u reached",
3455 sm->wpa_auth->conf.wpa_pairwise_update_count);
3456 SM_ENTER(WPA_PTK, DISCONNECT);
3457 } else if (sm->TimeoutEvt)
3458 SM_ENTER(WPA_PTK, PTKINITNEGOTIATING);
3459 break;
3460 case WPA_PTK_PTKINITDONE:
3461 break;
3462 }
3463 }
3464
3465
SM_STATE(WPA_PTK_GROUP,IDLE)3466 SM_STATE(WPA_PTK_GROUP, IDLE)
3467 {
3468 SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group);
3469 if (sm->Init) {
3470 /* Init flag is not cleared here, so avoid busy
3471 * loop by claiming nothing changed. */
3472 sm->changed = FALSE;
3473 }
3474 sm->GTimeoutCtr = 0;
3475 }
3476
3477
SM_STATE(WPA_PTK_GROUP,REKEYNEGOTIATING)3478 SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING)
3479 {
3480 u8 rsc[WPA_KEY_RSC_LEN];
3481 struct wpa_group *gsm = sm->group;
3482 const u8 *kde;
3483 u8 *kde_buf = NULL, *pos, hdr[2];
3484 size_t kde_len;
3485 u8 *gtk, dummy_gtk[32];
3486
3487 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group);
3488
3489 sm->GTimeoutCtr++;
3490 if (sm->wpa_auth->conf.wpa_disable_eapol_key_retries &&
3491 sm->GTimeoutCtr > 1) {
3492 /* Do not allow retransmission of EAPOL-Key group msg 1/2 */
3493 return;
3494 }
3495 if (sm->GTimeoutCtr > sm->wpa_auth->conf.wpa_group_update_count) {
3496 /* No point in sending the EAPOL-Key - we will disconnect
3497 * immediately following this. */
3498 return;
3499 }
3500
3501 if (sm->wpa == WPA_VERSION_WPA)
3502 sm->PInitAKeys = FALSE;
3503 sm->TimeoutEvt = FALSE;
3504 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
3505 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
3506 if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE)
3507 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc);
3508 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3509 "sending 1/2 msg of Group Key Handshake");
3510
3511 gtk = gsm->GTK[gsm->GN - 1];
3512 if (sm->wpa_auth->conf.disable_gtk ||
3513 sm->wpa_key_mgmt == WPA_KEY_MGMT_OSEN) {
3514 /*
3515 * Provide unique random GTK to each STA to prevent use
3516 * of GTK in the BSS.
3517 */
3518 if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0)
3519 return;
3520 gtk = dummy_gtk;
3521 }
3522 if (sm->wpa == WPA_VERSION_WPA2) {
3523 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
3524 ieee80211w_kde_len(sm) + ocv_oci_len(sm);
3525 kde_buf = os_malloc(kde_len);
3526 if (kde_buf == NULL)
3527 return;
3528
3529 kde = pos = kde_buf;
3530 hdr[0] = gsm->GN & 0x03;
3531 hdr[1] = 0;
3532 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
3533 gtk, gsm->GTK_len);
3534 pos = ieee80211w_kde_add(sm, pos);
3535 if (ocv_oci_add(sm, &pos) < 0) {
3536 os_free(kde_buf);
3537 return;
3538 }
3539 kde_len = pos - kde;
3540 } else {
3541 kde = gtk;
3542 kde_len = gsm->GTK_len;
3543 }
3544
3545 wpa_send_eapol(sm->wpa_auth, sm,
3546 WPA_KEY_INFO_SECURE |
3547 (wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len) ?
3548 WPA_KEY_INFO_MIC : 0) |
3549 WPA_KEY_INFO_ACK |
3550 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
3551 rsc, NULL, kde, kde_len, gsm->GN, 1);
3552
3553 os_free(kde_buf);
3554 }
3555
3556
SM_STATE(WPA_PTK_GROUP,REKEYESTABLISHED)3557 SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED)
3558 {
3559 #ifdef CONFIG_OCV
3560 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
3561 const u8 *key_data, *mic;
3562 struct ieee802_1x_hdr *hdr;
3563 struct wpa_eapol_key *key;
3564 struct wpa_eapol_ie_parse kde;
3565 size_t mic_len;
3566 u16 key_data_length;
3567 #endif /* CONFIG_OCV */
3568
3569 SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group);
3570 sm->EAPOLKeyReceived = FALSE;
3571
3572 #ifdef CONFIG_OCV
3573 mic_len = wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len);
3574
3575 /*
3576 * Note: last_rx_eapol_key length fields have already been validated in
3577 * wpa_receive().
3578 */
3579 hdr = (struct ieee802_1x_hdr *) sm->last_rx_eapol_key;
3580 key = (struct wpa_eapol_key *) (hdr + 1);
3581 mic = (u8 *) (key + 1);
3582 key_data = mic + mic_len + 2;
3583 key_data_length = WPA_GET_BE16(mic + mic_len);
3584 if (key_data_length > sm->last_rx_eapol_key_len - sizeof(*hdr) -
3585 sizeof(*key) - mic_len - 2)
3586 return;
3587
3588 if (wpa_parse_kde_ies(key_data, key_data_length, &kde) < 0) {
3589 wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
3590 "received EAPOL-Key group msg 2/2 with invalid Key Data contents");
3591 return;
3592 }
3593
3594 if (wpa_auth_uses_ocv(sm)) {
3595 struct wpa_channel_info ci;
3596 int tx_chanwidth;
3597 int tx_seg1_idx;
3598
3599 if (wpa_channel_info(wpa_auth, &ci) != 0) {
3600 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
3601 "Failed to get channel info to validate received OCI in EAPOL-Key group 1/2");
3602 return;
3603 }
3604
3605 if (get_sta_tx_parameters(sm,
3606 channel_width_to_int(ci.chanwidth),
3607 ci.seg1_idx, &tx_chanwidth,
3608 &tx_seg1_idx) < 0)
3609 return;
3610
3611 if (ocv_verify_tx_params(kde.oci, kde.oci_len, &ci,
3612 tx_chanwidth, tx_seg1_idx) != 0) {
3613 wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO,
3614 ocv_errorstr);
3615 return;
3616 }
3617 }
3618 #endif /* CONFIG_OCV */
3619
3620 if (sm->GUpdateStationKeys)
3621 sm->group->GKeyDoneStations--;
3622 sm->GUpdateStationKeys = FALSE;
3623 sm->GTimeoutCtr = 0;
3624 /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */
3625 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3626 "group key handshake completed (%s)",
3627 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN");
3628 sm->has_GTK = TRUE;
3629 }
3630
3631
SM_STATE(WPA_PTK_GROUP,KEYERROR)3632 SM_STATE(WPA_PTK_GROUP, KEYERROR)
3633 {
3634 SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group);
3635 if (sm->GUpdateStationKeys)
3636 sm->group->GKeyDoneStations--;
3637 sm->GUpdateStationKeys = FALSE;
3638 sm->Disconnect = TRUE;
3639 wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO,
3640 "group key handshake failed (%s) after %u tries",
3641 sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN",
3642 sm->wpa_auth->conf.wpa_group_update_count);
3643 }
3644
3645
SM_STEP(WPA_PTK_GROUP)3646 SM_STEP(WPA_PTK_GROUP)
3647 {
3648 if (sm->Init || sm->PtkGroupInit) {
3649 SM_ENTER(WPA_PTK_GROUP, IDLE);
3650 sm->PtkGroupInit = FALSE;
3651 } else switch (sm->wpa_ptk_group_state) {
3652 case WPA_PTK_GROUP_IDLE:
3653 if (sm->GUpdateStationKeys ||
3654 (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys))
3655 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3656 break;
3657 case WPA_PTK_GROUP_REKEYNEGOTIATING:
3658 if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest &&
3659 !sm->EAPOLKeyPairwise && sm->MICVerified)
3660 SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED);
3661 else if (sm->GTimeoutCtr >
3662 sm->wpa_auth->conf.wpa_group_update_count ||
3663 (sm->wpa_auth->conf.wpa_disable_eapol_key_retries &&
3664 sm->GTimeoutCtr > 1))
3665 SM_ENTER(WPA_PTK_GROUP, KEYERROR);
3666 else if (sm->TimeoutEvt)
3667 SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING);
3668 break;
3669 case WPA_PTK_GROUP_KEYERROR:
3670 SM_ENTER(WPA_PTK_GROUP, IDLE);
3671 break;
3672 case WPA_PTK_GROUP_REKEYESTABLISHED:
3673 SM_ENTER(WPA_PTK_GROUP, IDLE);
3674 break;
3675 }
3676 }
3677
3678
wpa_gtk_update(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3679 static int wpa_gtk_update(struct wpa_authenticator *wpa_auth,
3680 struct wpa_group *group)
3681 {
3682 int ret = 0;
3683
3684 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3685 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3686 if (wpa_gmk_to_gtk(group->GMK, "Group key expansion",
3687 wpa_auth->addr, group->GNonce,
3688 group->GTK[group->GN - 1], group->GTK_len) < 0)
3689 ret = -1;
3690 wpa_hexdump_key(MSG_DEBUG, "GTK",
3691 group->GTK[group->GN - 1], group->GTK_len);
3692
3693 #ifdef CONFIG_IEEE80211W
3694 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3695 size_t len;
3696 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3697 os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN);
3698 inc_byte_array(group->Counter, WPA_NONCE_LEN);
3699 if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion",
3700 wpa_auth->addr, group->GNonce,
3701 group->IGTK[group->GN_igtk - 4], len) < 0)
3702 ret = -1;
3703 wpa_hexdump_key(MSG_DEBUG, "IGTK",
3704 group->IGTK[group->GN_igtk - 4], len);
3705 }
3706 #endif /* CONFIG_IEEE80211W */
3707
3708 return ret;
3709 }
3710
3711
wpa_group_gtk_init(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3712 static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth,
3713 struct wpa_group *group)
3714 {
3715 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3716 "GTK_INIT (VLAN-ID %d)", group->vlan_id);
3717 group->changed = FALSE; /* GInit is not cleared here; avoid loop */
3718 group->wpa_group_state = WPA_GROUP_GTK_INIT;
3719
3720 /* GTK[0..N] = 0 */
3721 os_memset(group->GTK, 0, sizeof(group->GTK));
3722 group->GN = 1;
3723 group->GM = 2;
3724 #ifdef CONFIG_IEEE80211W
3725 group->GN_igtk = 4;
3726 group->GM_igtk = 5;
3727 #endif /* CONFIG_IEEE80211W */
3728 /* GTK[GN] = CalcGTK() */
3729 wpa_gtk_update(wpa_auth, group);
3730 }
3731
3732
wpa_group_update_sta(struct wpa_state_machine * sm,void * ctx)3733 static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx)
3734 {
3735 if (ctx != NULL && ctx != sm->group)
3736 return 0;
3737
3738 if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) {
3739 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3740 "Not in PTKINITDONE; skip Group Key update");
3741 sm->GUpdateStationKeys = FALSE;
3742 return 0;
3743 }
3744 if (sm->GUpdateStationKeys) {
3745 /*
3746 * This should not really happen, so add a debug log entry.
3747 * Since we clear the GKeyDoneStations before the loop, the
3748 * station needs to be counted here anyway.
3749 */
3750 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
3751 "GUpdateStationKeys was already set when "
3752 "marking station for GTK rekeying");
3753 }
3754
3755 /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */
3756 if (sm->is_wnmsleep)
3757 return 0;
3758
3759 sm->group->GKeyDoneStations++;
3760 sm->GUpdateStationKeys = TRUE;
3761
3762 wpa_sm_step(sm);
3763 return 0;
3764 }
3765
3766
3767 #ifdef CONFIG_WNM_AP
3768 /* update GTK when exiting WNM-Sleep Mode */
wpa_wnmsleep_rekey_gtk(struct wpa_state_machine * sm)3769 void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm)
3770 {
3771 if (sm == NULL || sm->is_wnmsleep)
3772 return;
3773
3774 wpa_group_update_sta(sm, NULL);
3775 }
3776
3777
wpa_set_wnmsleep(struct wpa_state_machine * sm,int flag)3778 void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag)
3779 {
3780 if (sm)
3781 sm->is_wnmsleep = !!flag;
3782 }
3783
3784
wpa_wnmsleep_gtk_subelem(struct wpa_state_machine * sm,u8 * pos)3785 int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3786 {
3787 struct wpa_group *gsm = sm->group;
3788 u8 *start = pos;
3789
3790 /*
3791 * GTK subelement:
3792 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
3793 * Key[5..32]
3794 */
3795 *pos++ = WNM_SLEEP_SUBELEM_GTK;
3796 *pos++ = 11 + gsm->GTK_len;
3797 /* Key ID in B0-B1 of Key Info */
3798 WPA_PUT_LE16(pos, gsm->GN & 0x03);
3799 pos += 2;
3800 *pos++ = gsm->GTK_len;
3801 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0)
3802 return 0;
3803 pos += 8;
3804 os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3805 pos += gsm->GTK_len;
3806
3807 wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit",
3808 gsm->GN);
3809 wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit",
3810 gsm->GTK[gsm->GN - 1], gsm->GTK_len);
3811
3812 return pos - start;
3813 }
3814
3815
3816 #ifdef CONFIG_IEEE80211W
wpa_wnmsleep_igtk_subelem(struct wpa_state_machine * sm,u8 * pos)3817 int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos)
3818 {
3819 struct wpa_group *gsm = sm->group;
3820 u8 *start = pos;
3821 size_t len = wpa_cipher_key_len(sm->wpa_auth->conf.group_mgmt_cipher);
3822
3823 /*
3824 * IGTK subelement:
3825 * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16]
3826 */
3827 *pos++ = WNM_SLEEP_SUBELEM_IGTK;
3828 *pos++ = 2 + 6 + len;
3829 WPA_PUT_LE16(pos, gsm->GN_igtk);
3830 pos += 2;
3831 if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0)
3832 return 0;
3833 pos += 6;
3834
3835 os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], len);
3836 pos += len;
3837
3838 wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit",
3839 gsm->GN_igtk);
3840 wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit",
3841 gsm->IGTK[gsm->GN_igtk - 4], len);
3842
3843 return pos - start;
3844 }
3845 #endif /* CONFIG_IEEE80211W */
3846 #endif /* CONFIG_WNM_AP */
3847
3848
wpa_group_setkeys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3849 static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth,
3850 struct wpa_group *group)
3851 {
3852 int tmp;
3853
3854 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3855 "SETKEYS (VLAN-ID %d)", group->vlan_id);
3856 group->changed = TRUE;
3857 group->wpa_group_state = WPA_GROUP_SETKEYS;
3858 group->GTKReKey = FALSE;
3859 tmp = group->GM;
3860 group->GM = group->GN;
3861 group->GN = tmp;
3862 #ifdef CONFIG_IEEE80211W
3863 tmp = group->GM_igtk;
3864 group->GM_igtk = group->GN_igtk;
3865 group->GN_igtk = tmp;
3866 #endif /* CONFIG_IEEE80211W */
3867 /* "GKeyDoneStations = GNoStations" is done in more robust way by
3868 * counting the STAs that are marked with GUpdateStationKeys instead of
3869 * including all STAs that could be in not-yet-completed state. */
3870 wpa_gtk_update(wpa_auth, group);
3871
3872 if (group->GKeyDoneStations) {
3873 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected "
3874 "GKeyDoneStations=%d when starting new GTK rekey",
3875 group->GKeyDoneStations);
3876 group->GKeyDoneStations = 0;
3877 }
3878 wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group);
3879 wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d",
3880 group->GKeyDoneStations);
3881 }
3882
3883
wpa_group_config_group_keys(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3884 static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth,
3885 struct wpa_group *group)
3886 {
3887 int ret = 0;
3888
3889 if (wpa_auth_set_key(wpa_auth, group->vlan_id,
3890 wpa_cipher_to_alg(wpa_auth->conf.wpa_group),
3891 broadcast_ether_addr, group->GN,
3892 group->GTK[group->GN - 1], group->GTK_len) < 0)
3893 ret = -1;
3894
3895 #ifdef CONFIG_IEEE80211W
3896 if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) {
3897 enum wpa_alg alg;
3898 size_t len;
3899
3900 alg = wpa_cipher_to_alg(wpa_auth->conf.group_mgmt_cipher);
3901 len = wpa_cipher_key_len(wpa_auth->conf.group_mgmt_cipher);
3902
3903 if (ret == 0 &&
3904 wpa_auth_set_key(wpa_auth, group->vlan_id, alg,
3905 broadcast_ether_addr, group->GN_igtk,
3906 group->IGTK[group->GN_igtk - 4], len) < 0)
3907 ret = -1;
3908 }
3909 #endif /* CONFIG_IEEE80211W */
3910
3911 return ret;
3912 }
3913
3914
wpa_group_disconnect_cb(struct wpa_state_machine * sm,void * ctx)3915 static int wpa_group_disconnect_cb(struct wpa_state_machine *sm, void *ctx)
3916 {
3917 if (sm->group == ctx) {
3918 wpa_printf(MSG_DEBUG, "WPA: Mark STA " MACSTR
3919 " for discconnection due to fatal failure",
3920 MAC2STR(sm->addr));
3921 sm->Disconnect = TRUE;
3922 }
3923
3924 return 0;
3925 }
3926
3927
wpa_group_fatal_failure(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3928 static void wpa_group_fatal_failure(struct wpa_authenticator *wpa_auth,
3929 struct wpa_group *group)
3930 {
3931 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state FATAL_FAILURE");
3932 group->changed = TRUE;
3933 group->wpa_group_state = WPA_GROUP_FATAL_FAILURE;
3934 wpa_auth_for_each_sta(wpa_auth, wpa_group_disconnect_cb, group);
3935 }
3936
3937
wpa_group_setkeysdone(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3938 static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth,
3939 struct wpa_group *group)
3940 {
3941 wpa_printf(MSG_DEBUG, "WPA: group state machine entering state "
3942 "SETKEYSDONE (VLAN-ID %d)", group->vlan_id);
3943 group->changed = TRUE;
3944 group->wpa_group_state = WPA_GROUP_SETKEYSDONE;
3945
3946 if (wpa_group_config_group_keys(wpa_auth, group) < 0) {
3947 wpa_group_fatal_failure(wpa_auth, group);
3948 return -1;
3949 }
3950
3951 return 0;
3952 }
3953
3954
wpa_group_sm_step(struct wpa_authenticator * wpa_auth,struct wpa_group * group)3955 static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth,
3956 struct wpa_group *group)
3957 {
3958 if (group->GInit) {
3959 wpa_group_gtk_init(wpa_auth, group);
3960 } else if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE) {
3961 /* Do not allow group operations */
3962 } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT &&
3963 group->GTKAuthenticator) {
3964 wpa_group_setkeysdone(wpa_auth, group);
3965 } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE &&
3966 group->GTKReKey) {
3967 wpa_group_setkeys(wpa_auth, group);
3968 } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) {
3969 if (group->GKeyDoneStations == 0)
3970 wpa_group_setkeysdone(wpa_auth, group);
3971 else if (group->GTKReKey)
3972 wpa_group_setkeys(wpa_auth, group);
3973 }
3974 }
3975
3976
wpa_sm_step(struct wpa_state_machine * sm)3977 static int wpa_sm_step(struct wpa_state_machine *sm)
3978 {
3979 if (sm == NULL)
3980 return 0;
3981
3982 if (sm->in_step_loop) {
3983 /* This should not happen, but if it does, make sure we do not
3984 * end up freeing the state machine too early by exiting the
3985 * recursive call. */
3986 wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively");
3987 return 0;
3988 }
3989
3990 sm->in_step_loop = 1;
3991 do {
3992 if (sm->pending_deinit)
3993 break;
3994
3995 sm->changed = FALSE;
3996 sm->wpa_auth->group->changed = FALSE;
3997
3998 SM_STEP_RUN(WPA_PTK);
3999 if (sm->pending_deinit)
4000 break;
4001 SM_STEP_RUN(WPA_PTK_GROUP);
4002 if (sm->pending_deinit)
4003 break;
4004 wpa_group_sm_step(sm->wpa_auth, sm->group);
4005 } while (sm->changed || sm->wpa_auth->group->changed);
4006 sm->in_step_loop = 0;
4007
4008 if (sm->pending_deinit) {
4009 wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state "
4010 "machine deinit for " MACSTR, MAC2STR(sm->addr));
4011 wpa_free_sta_sm(sm);
4012 return 1;
4013 }
4014 return 0;
4015 }
4016
4017
wpa_sm_call_step(void * eloop_ctx,void * timeout_ctx)4018 static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx)
4019 {
4020 struct wpa_state_machine *sm = eloop_ctx;
4021 wpa_sm_step(sm);
4022 }
4023
4024
wpa_auth_sm_notify(struct wpa_state_machine * sm)4025 void wpa_auth_sm_notify(struct wpa_state_machine *sm)
4026 {
4027 if (sm == NULL)
4028 return;
4029 eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL);
4030 }
4031
4032
wpa_gtk_rekey(struct wpa_authenticator * wpa_auth)4033 void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth)
4034 {
4035 int tmp, i;
4036 struct wpa_group *group;
4037
4038 if (wpa_auth == NULL)
4039 return;
4040
4041 group = wpa_auth->group;
4042
4043 for (i = 0; i < 2; i++) {
4044 tmp = group->GM;
4045 group->GM = group->GN;
4046 group->GN = tmp;
4047 #ifdef CONFIG_IEEE80211W
4048 tmp = group->GM_igtk;
4049 group->GM_igtk = group->GN_igtk;
4050 group->GN_igtk = tmp;
4051 #endif /* CONFIG_IEEE80211W */
4052 wpa_gtk_update(wpa_auth, group);
4053 wpa_group_config_group_keys(wpa_auth, group);
4054 }
4055 }
4056
4057
wpa_bool_txt(int val)4058 static const char * wpa_bool_txt(int val)
4059 {
4060 return val ? "TRUE" : "FALSE";
4061 }
4062
4063
4064 #define RSN_SUITE "%02x-%02x-%02x-%d"
4065 #define RSN_SUITE_ARG(s) \
4066 ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff
4067
wpa_get_mib(struct wpa_authenticator * wpa_auth,char * buf,size_t buflen)4068 int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen)
4069 {
4070 int len = 0, ret;
4071 char pmkid_txt[PMKID_LEN * 2 + 1];
4072 #ifdef CONFIG_RSN_PREAUTH
4073 const int preauth = 1;
4074 #else /* CONFIG_RSN_PREAUTH */
4075 const int preauth = 0;
4076 #endif /* CONFIG_RSN_PREAUTH */
4077
4078 if (wpa_auth == NULL)
4079 return len;
4080
4081 ret = os_snprintf(buf + len, buflen - len,
4082 "dot11RSNAOptionImplemented=TRUE\n"
4083 "dot11RSNAPreauthenticationImplemented=%s\n"
4084 "dot11RSNAEnabled=%s\n"
4085 "dot11RSNAPreauthenticationEnabled=%s\n",
4086 wpa_bool_txt(preauth),
4087 wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN),
4088 wpa_bool_txt(wpa_auth->conf.rsn_preauth));
4089 if (os_snprintf_error(buflen - len, ret))
4090 return len;
4091 len += ret;
4092
4093 wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt),
4094 wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN);
4095
4096 ret = os_snprintf(
4097 buf + len, buflen - len,
4098 "dot11RSNAConfigVersion=%u\n"
4099 "dot11RSNAConfigPairwiseKeysSupported=9999\n"
4100 /* FIX: dot11RSNAConfigGroupCipher */
4101 /* FIX: dot11RSNAConfigGroupRekeyMethod */
4102 /* FIX: dot11RSNAConfigGroupRekeyTime */
4103 /* FIX: dot11RSNAConfigGroupRekeyPackets */
4104 "dot11RSNAConfigGroupRekeyStrict=%u\n"
4105 "dot11RSNAConfigGroupUpdateCount=%u\n"
4106 "dot11RSNAConfigPairwiseUpdateCount=%u\n"
4107 "dot11RSNAConfigGroupCipherSize=%u\n"
4108 "dot11RSNAConfigPMKLifetime=%u\n"
4109 "dot11RSNAConfigPMKReauthThreshold=%u\n"
4110 "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n"
4111 "dot11RSNAConfigSATimeout=%u\n"
4112 "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n"
4113 "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n"
4114 "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n"
4115 "dot11RSNAPMKIDUsed=%s\n"
4116 "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n"
4117 "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n"
4118 "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n"
4119 "dot11RSNATKIPCounterMeasuresInvoked=%u\n"
4120 "dot11RSNA4WayHandshakeFailures=%u\n"
4121 "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n",
4122 RSN_VERSION,
4123 !!wpa_auth->conf.wpa_strict_rekey,
4124 wpa_auth->conf.wpa_group_update_count,
4125 wpa_auth->conf.wpa_pairwise_update_count,
4126 wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8,
4127 dot11RSNAConfigPMKLifetime,
4128 dot11RSNAConfigPMKReauthThreshold,
4129 dot11RSNAConfigSATimeout,
4130 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected),
4131 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected),
4132 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected),
4133 pmkid_txt,
4134 RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested),
4135 RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested),
4136 RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested),
4137 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked,
4138 wpa_auth->dot11RSNA4WayHandshakeFailures);
4139 if (os_snprintf_error(buflen - len, ret))
4140 return len;
4141 len += ret;
4142
4143 /* TODO: dot11RSNAConfigPairwiseCiphersTable */
4144 /* TODO: dot11RSNAConfigAuthenticationSuitesTable */
4145
4146 /* Private MIB */
4147 ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n",
4148 wpa_auth->group->wpa_group_state);
4149 if (os_snprintf_error(buflen - len, ret))
4150 return len;
4151 len += ret;
4152
4153 return len;
4154 }
4155
4156
wpa_get_mib_sta(struct wpa_state_machine * sm,char * buf,size_t buflen)4157 int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen)
4158 {
4159 int len = 0, ret;
4160 u32 pairwise = 0;
4161
4162 if (sm == NULL)
4163 return 0;
4164
4165 /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */
4166
4167 /* dot11RSNAStatsEntry */
4168
4169 pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ?
4170 WPA_PROTO_RSN : WPA_PROTO_WPA,
4171 sm->pairwise);
4172 if (pairwise == 0)
4173 return 0;
4174
4175 ret = os_snprintf(
4176 buf + len, buflen - len,
4177 /* TODO: dot11RSNAStatsIndex */
4178 "dot11RSNAStatsSTAAddress=" MACSTR "\n"
4179 "dot11RSNAStatsVersion=1\n"
4180 "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n"
4181 /* TODO: dot11RSNAStatsTKIPICVErrors */
4182 "dot11RSNAStatsTKIPLocalMICFailures=%u\n"
4183 "dot11RSNAStatsTKIPRemoteMICFailures=%u\n"
4184 /* TODO: dot11RSNAStatsCCMPReplays */
4185 /* TODO: dot11RSNAStatsCCMPDecryptErrors */
4186 /* TODO: dot11RSNAStatsTKIPReplays */,
4187 MAC2STR(sm->addr),
4188 RSN_SUITE_ARG(pairwise),
4189 sm->dot11RSNAStatsTKIPLocalMICFailures,
4190 sm->dot11RSNAStatsTKIPRemoteMICFailures);
4191 if (os_snprintf_error(buflen - len, ret))
4192 return len;
4193 len += ret;
4194
4195 /* Private MIB */
4196 ret = os_snprintf(buf + len, buflen - len,
4197 "hostapdWPAPTKState=%d\n"
4198 "hostapdWPAPTKGroupState=%d\n",
4199 sm->wpa_ptk_state,
4200 sm->wpa_ptk_group_state);
4201 if (os_snprintf_error(buflen - len, ret))
4202 return len;
4203 len += ret;
4204
4205 return len;
4206 }
4207
4208
wpa_auth_countermeasures_start(struct wpa_authenticator * wpa_auth)4209 void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth)
4210 {
4211 if (wpa_auth)
4212 wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++;
4213 }
4214
4215
wpa_auth_pairwise_set(struct wpa_state_machine * sm)4216 int wpa_auth_pairwise_set(struct wpa_state_machine *sm)
4217 {
4218 return sm && sm->pairwise_set;
4219 }
4220
4221
wpa_auth_get_pairwise(struct wpa_state_machine * sm)4222 int wpa_auth_get_pairwise(struct wpa_state_machine *sm)
4223 {
4224 return sm->pairwise;
4225 }
4226
4227
wpa_auth_get_pmk(struct wpa_state_machine * sm,int * len)4228 const u8 * wpa_auth_get_pmk(struct wpa_state_machine *sm, int *len)
4229 {
4230 if (!sm)
4231 return NULL;
4232 *len = sm->pmk_len;
4233 return sm->PMK;
4234 }
4235
4236
wpa_auth_sta_key_mgmt(struct wpa_state_machine * sm)4237 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm)
4238 {
4239 if (sm == NULL)
4240 return -1;
4241 return sm->wpa_key_mgmt;
4242 }
4243
4244
wpa_auth_sta_wpa_version(struct wpa_state_machine * sm)4245 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
4246 {
4247 if (sm == NULL)
4248 return 0;
4249 return sm->wpa;
4250 }
4251
4252
wpa_auth_sta_ft_tk_already_set(struct wpa_state_machine * sm)4253 int wpa_auth_sta_ft_tk_already_set(struct wpa_state_machine *sm)
4254 {
4255 if (!sm || !wpa_key_mgmt_ft(sm->wpa_key_mgmt))
4256 return 0;
4257 return sm->tk_already_set;
4258 }
4259
4260
wpa_auth_sta_fils_tk_already_set(struct wpa_state_machine * sm)4261 int wpa_auth_sta_fils_tk_already_set(struct wpa_state_machine *sm)
4262 {
4263 if (!sm || !wpa_key_mgmt_fils(sm->wpa_key_mgmt))
4264 return 0;
4265 return sm->tk_already_set;
4266 }
4267
4268
wpa_auth_sta_clear_pmksa(struct wpa_state_machine * sm,struct rsn_pmksa_cache_entry * entry)4269 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
4270 struct rsn_pmksa_cache_entry *entry)
4271 {
4272 if (sm == NULL || sm->pmksa != entry)
4273 return -1;
4274 sm->pmksa = NULL;
4275 return 0;
4276 }
4277
4278
4279 struct rsn_pmksa_cache_entry *
wpa_auth_sta_get_pmksa(struct wpa_state_machine * sm)4280 wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm)
4281 {
4282 return sm ? sm->pmksa : NULL;
4283 }
4284
4285
wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine * sm)4286 void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm)
4287 {
4288 if (sm)
4289 sm->dot11RSNAStatsTKIPLocalMICFailures++;
4290 }
4291
4292
wpa_auth_get_wpa_ie(struct wpa_authenticator * wpa_auth,size_t * len)4293 const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len)
4294 {
4295 if (wpa_auth == NULL)
4296 return NULL;
4297 *len = wpa_auth->wpa_ie_len;
4298 return wpa_auth->wpa_ie;
4299 }
4300
4301
wpa_auth_pmksa_add(struct wpa_state_machine * sm,const u8 * pmk,unsigned int pmk_len,int session_timeout,struct eapol_state_machine * eapol)4302 int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk,
4303 unsigned int pmk_len,
4304 int session_timeout, struct eapol_state_machine *eapol)
4305 {
4306 if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 ||
4307 sm->wpa_auth->conf.disable_pmksa_caching)
4308 return -1;
4309
4310 if (wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) {
4311 if (pmk_len > PMK_LEN_SUITE_B_192)
4312 pmk_len = PMK_LEN_SUITE_B_192;
4313 } else if (pmk_len > PMK_LEN) {
4314 pmk_len = PMK_LEN;
4315 }
4316
4317 if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, pmk_len, NULL,
4318 sm->PTK.kck, sm->PTK.kck_len,
4319 sm->wpa_auth->addr, sm->addr, session_timeout,
4320 eapol, sm->wpa_key_mgmt))
4321 return 0;
4322
4323 return -1;
4324 }
4325
4326
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)4327 int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth,
4328 const u8 *pmk, size_t len, const u8 *sta_addr,
4329 int session_timeout,
4330 struct eapol_state_machine *eapol)
4331 {
4332 if (wpa_auth == NULL)
4333 return -1;
4334
4335 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, NULL,
4336 NULL, 0,
4337 wpa_auth->addr,
4338 sta_addr, session_timeout, eapol,
4339 WPA_KEY_MGMT_IEEE8021X))
4340 return 0;
4341
4342 return -1;
4343 }
4344
4345
wpa_auth_pmksa_add_sae(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * pmk,const u8 * pmkid)4346 int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr,
4347 const u8 *pmk, const u8 *pmkid)
4348 {
4349 if (wpa_auth->conf.disable_pmksa_caching)
4350 return -1;
4351
4352 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, PMK_LEN, pmkid,
4353 NULL, 0,
4354 wpa_auth->addr, addr, 0, NULL,
4355 WPA_KEY_MGMT_SAE))
4356 return 0;
4357
4358 return -1;
4359 }
4360
4361
wpa_auth_add_sae_pmkid(struct wpa_state_machine * sm,const u8 * pmkid)4362 void wpa_auth_add_sae_pmkid(struct wpa_state_machine *sm, const u8 *pmkid)
4363 {
4364 os_memcpy(sm->pmkid, pmkid, PMKID_LEN);
4365 sm->pmkid_set = 1;
4366 }
4367
4368
wpa_auth_pmksa_add2(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * pmk,size_t pmk_len,const u8 * pmkid,int session_timeout,int akmp)4369 int wpa_auth_pmksa_add2(struct wpa_authenticator *wpa_auth, const u8 *addr,
4370 const u8 *pmk, size_t pmk_len, const u8 *pmkid,
4371 int session_timeout, int akmp)
4372 {
4373 if (wpa_auth->conf.disable_pmksa_caching)
4374 return -1;
4375
4376 if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, pmk_len, pmkid,
4377 NULL, 0, wpa_auth->addr, addr, session_timeout,
4378 NULL, akmp))
4379 return 0;
4380
4381 return -1;
4382 }
4383
4384
wpa_auth_pmksa_remove(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)4385 void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
4386 const u8 *sta_addr)
4387 {
4388 struct rsn_pmksa_cache_entry *pmksa;
4389
4390 if (wpa_auth == NULL || wpa_auth->pmksa == NULL)
4391 return;
4392 pmksa = pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, NULL);
4393 if (pmksa) {
4394 wpa_printf(MSG_DEBUG, "WPA: Remove PMKSA cache entry for "
4395 MACSTR " based on request", MAC2STR(sta_addr));
4396 pmksa_cache_free_entry(wpa_auth->pmksa, pmksa);
4397 }
4398 }
4399
4400
wpa_auth_pmksa_list(struct wpa_authenticator * wpa_auth,char * buf,size_t len)4401 int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
4402 size_t len)
4403 {
4404 if (!wpa_auth || !wpa_auth->pmksa)
4405 return 0;
4406 return pmksa_cache_auth_list(wpa_auth->pmksa, buf, len);
4407 }
4408
4409
wpa_auth_pmksa_flush(struct wpa_authenticator * wpa_auth)4410 void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth)
4411 {
4412 if (wpa_auth && wpa_auth->pmksa)
4413 pmksa_cache_auth_flush(wpa_auth->pmksa);
4414 }
4415
4416
4417 #ifdef CONFIG_PMKSA_CACHE_EXTERNAL
4418 #ifdef CONFIG_MESH
4419
wpa_auth_pmksa_list_mesh(struct wpa_authenticator * wpa_auth,const u8 * addr,char * buf,size_t len)4420 int wpa_auth_pmksa_list_mesh(struct wpa_authenticator *wpa_auth, const u8 *addr,
4421 char *buf, size_t len)
4422 {
4423 if (!wpa_auth || !wpa_auth->pmksa)
4424 return 0;
4425
4426 return pmksa_cache_auth_list_mesh(wpa_auth->pmksa, addr, buf, len);
4427 }
4428
4429
4430 struct rsn_pmksa_cache_entry *
wpa_auth_pmksa_create_entry(const u8 * aa,const u8 * spa,const u8 * pmk,const u8 * pmkid,int expiration)4431 wpa_auth_pmksa_create_entry(const u8 *aa, const u8 *spa, const u8 *pmk,
4432 const u8 *pmkid, int expiration)
4433 {
4434 struct rsn_pmksa_cache_entry *entry;
4435 struct os_reltime now;
4436
4437 entry = pmksa_cache_auth_create_entry(pmk, PMK_LEN, pmkid, NULL, 0, aa,
4438 spa, 0, NULL, WPA_KEY_MGMT_SAE);
4439 if (!entry)
4440 return NULL;
4441
4442 os_get_reltime(&now);
4443 entry->expiration = now.sec + expiration;
4444 return entry;
4445 }
4446
4447
wpa_auth_pmksa_add_entry(struct wpa_authenticator * wpa_auth,struct rsn_pmksa_cache_entry * entry)4448 int wpa_auth_pmksa_add_entry(struct wpa_authenticator *wpa_auth,
4449 struct rsn_pmksa_cache_entry *entry)
4450 {
4451 int ret;
4452
4453 if (!wpa_auth || !wpa_auth->pmksa)
4454 return -1;
4455
4456 ret = pmksa_cache_auth_add_entry(wpa_auth->pmksa, entry);
4457 if (ret < 0)
4458 wpa_printf(MSG_DEBUG,
4459 "RSN: Failed to store external PMKSA cache for "
4460 MACSTR, MAC2STR(entry->spa));
4461
4462 return ret;
4463 }
4464
4465 #endif /* CONFIG_MESH */
4466 #endif /* CONFIG_PMKSA_CACHE_EXTERNAL */
4467
4468
4469 struct rsn_pmksa_cache_entry *
wpa_auth_pmksa_get(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 * pmkid)4470 wpa_auth_pmksa_get(struct wpa_authenticator *wpa_auth, const u8 *sta_addr,
4471 const u8 *pmkid)
4472 {
4473 if (!wpa_auth || !wpa_auth->pmksa)
4474 return NULL;
4475 return pmksa_cache_auth_get(wpa_auth->pmksa, sta_addr, pmkid);
4476 }
4477
4478
wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry * pmksa,struct wpa_state_machine * sm,struct wpa_authenticator * wpa_auth,u8 * pmkid,u8 * pmk)4479 void wpa_auth_pmksa_set_to_sm(struct rsn_pmksa_cache_entry *pmksa,
4480 struct wpa_state_machine *sm,
4481 struct wpa_authenticator *wpa_auth,
4482 u8 *pmkid, u8 *pmk)
4483 {
4484 if (!sm)
4485 return;
4486
4487 sm->pmksa = pmksa;
4488 os_memcpy(pmk, pmksa->pmk, PMK_LEN);
4489 os_memcpy(pmkid, pmksa->pmkid, PMKID_LEN);
4490 os_memcpy(wpa_auth->dot11RSNAPMKIDUsed, pmksa->pmkid, PMKID_LEN);
4491 }
4492
4493
4494 /*
4495 * Remove and free the group from wpa_authenticator. This is triggered by a
4496 * callback to make sure nobody is currently iterating the group list while it
4497 * gets modified.
4498 */
wpa_group_free(struct wpa_authenticator * wpa_auth,struct wpa_group * group)4499 static void wpa_group_free(struct wpa_authenticator *wpa_auth,
4500 struct wpa_group *group)
4501 {
4502 struct wpa_group *prev = wpa_auth->group;
4503
4504 wpa_printf(MSG_DEBUG, "WPA: Remove group state machine for VLAN-ID %d",
4505 group->vlan_id);
4506
4507 while (prev) {
4508 if (prev->next == group) {
4509 /* This never frees the special first group as needed */
4510 prev->next = group->next;
4511 os_free(group);
4512 break;
4513 }
4514 prev = prev->next;
4515 }
4516
4517 }
4518
4519
4520 /* Increase the reference counter for group */
wpa_group_get(struct wpa_authenticator * wpa_auth,struct wpa_group * group)4521 static void wpa_group_get(struct wpa_authenticator *wpa_auth,
4522 struct wpa_group *group)
4523 {
4524 /* Skip the special first group */
4525 if (wpa_auth->group == group)
4526 return;
4527
4528 group->references++;
4529 }
4530
4531
4532 /* Decrease the reference counter and maybe free the group */
wpa_group_put(struct wpa_authenticator * wpa_auth,struct wpa_group * group)4533 static void wpa_group_put(struct wpa_authenticator *wpa_auth,
4534 struct wpa_group *group)
4535 {
4536 /* Skip the special first group */
4537 if (wpa_auth->group == group)
4538 return;
4539
4540 group->references--;
4541 if (group->references)
4542 return;
4543 wpa_group_free(wpa_auth, group);
4544 }
4545
4546
4547 /*
4548 * Add a group that has its references counter set to zero. Caller needs to
4549 * call wpa_group_get() on the return value to mark the entry in use.
4550 */
4551 static struct wpa_group *
wpa_auth_add_group(struct wpa_authenticator * wpa_auth,int vlan_id)4552 wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4553 {
4554 struct wpa_group *group;
4555
4556 if (wpa_auth == NULL || wpa_auth->group == NULL)
4557 return NULL;
4558
4559 wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d",
4560 vlan_id);
4561 group = wpa_group_init(wpa_auth, vlan_id, 0);
4562 if (group == NULL)
4563 return NULL;
4564
4565 group->next = wpa_auth->group->next;
4566 wpa_auth->group->next = group;
4567
4568 return group;
4569 }
4570
4571
4572 /*
4573 * Enforce that the group state machine for the VLAN is running, increase
4574 * reference counter as interface is up. References might have been increased
4575 * even if a negative value is returned.
4576 * Returns: -1 on error (group missing, group already failed); otherwise, 0
4577 */
wpa_auth_ensure_group(struct wpa_authenticator * wpa_auth,int vlan_id)4578 int wpa_auth_ensure_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4579 {
4580 struct wpa_group *group;
4581
4582 if (wpa_auth == NULL)
4583 return 0;
4584
4585 group = wpa_auth->group;
4586 while (group) {
4587 if (group->vlan_id == vlan_id)
4588 break;
4589 group = group->next;
4590 }
4591
4592 if (group == NULL) {
4593 group = wpa_auth_add_group(wpa_auth, vlan_id);
4594 if (group == NULL)
4595 return -1;
4596 }
4597
4598 wpa_printf(MSG_DEBUG,
4599 "WPA: Ensure group state machine running for VLAN ID %d",
4600 vlan_id);
4601
4602 wpa_group_get(wpa_auth, group);
4603 group->num_setup_iface++;
4604
4605 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4606 return -1;
4607
4608 return 0;
4609 }
4610
4611
4612 /*
4613 * Decrease reference counter, expected to be zero afterwards.
4614 * returns: -1 on error (group not found, group in fail state)
4615 * -2 if wpa_group is still referenced
4616 * 0 else
4617 */
wpa_auth_release_group(struct wpa_authenticator * wpa_auth,int vlan_id)4618 int wpa_auth_release_group(struct wpa_authenticator *wpa_auth, int vlan_id)
4619 {
4620 struct wpa_group *group;
4621 int ret = 0;
4622
4623 if (wpa_auth == NULL)
4624 return 0;
4625
4626 group = wpa_auth->group;
4627 while (group) {
4628 if (group->vlan_id == vlan_id)
4629 break;
4630 group = group->next;
4631 }
4632
4633 if (group == NULL)
4634 return -1;
4635
4636 wpa_printf(MSG_DEBUG,
4637 "WPA: Try stopping group state machine for VLAN ID %d",
4638 vlan_id);
4639
4640 if (group->num_setup_iface <= 0) {
4641 wpa_printf(MSG_ERROR,
4642 "WPA: wpa_auth_release_group called more often than wpa_auth_ensure_group for VLAN ID %d, skipping.",
4643 vlan_id);
4644 return -1;
4645 }
4646 group->num_setup_iface--;
4647
4648 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4649 ret = -1;
4650
4651 if (group->references > 1) {
4652 wpa_printf(MSG_DEBUG,
4653 "WPA: Cannot stop group state machine for VLAN ID %d as references are still hold",
4654 vlan_id);
4655 ret = -2;
4656 }
4657
4658 wpa_group_put(wpa_auth, group);
4659
4660 return ret;
4661 }
4662
4663
wpa_auth_sta_set_vlan(struct wpa_state_machine * sm,int vlan_id)4664 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id)
4665 {
4666 struct wpa_group *group;
4667
4668 if (sm == NULL || sm->wpa_auth == NULL)
4669 return 0;
4670
4671 group = sm->wpa_auth->group;
4672 while (group) {
4673 if (group->vlan_id == vlan_id)
4674 break;
4675 group = group->next;
4676 }
4677
4678 if (group == NULL) {
4679 group = wpa_auth_add_group(sm->wpa_auth, vlan_id);
4680 if (group == NULL)
4681 return -1;
4682 }
4683
4684 if (sm->group == group)
4685 return 0;
4686
4687 if (group->wpa_group_state == WPA_GROUP_FATAL_FAILURE)
4688 return -1;
4689
4690 wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state "
4691 "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id);
4692
4693 wpa_group_get(sm->wpa_auth, group);
4694 wpa_group_put(sm->wpa_auth, sm->group);
4695 sm->group = group;
4696
4697 return 0;
4698 }
4699
4700
wpa_auth_eapol_key_tx_status(struct wpa_authenticator * wpa_auth,struct wpa_state_machine * sm,int ack)4701 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
4702 struct wpa_state_machine *sm, int ack)
4703 {
4704 if (wpa_auth == NULL || sm == NULL)
4705 return;
4706 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR
4707 " ack=%d", MAC2STR(sm->addr), ack);
4708 if (sm->pending_1_of_4_timeout && ack) {
4709 /*
4710 * Some deployed supplicant implementations update their SNonce
4711 * for each EAPOL-Key 2/4 message even within the same 4-way
4712 * handshake and then fail to use the first SNonce when
4713 * deriving the PTK. This results in unsuccessful 4-way
4714 * handshake whenever the relatively short initial timeout is
4715 * reached and EAPOL-Key 1/4 is retransmitted. Try to work
4716 * around this by increasing the timeout now that we know that
4717 * the station has received the frame.
4718 */
4719 int timeout_ms = eapol_key_timeout_subseq;
4720 wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 "
4721 "timeout by %u ms because of acknowledged frame",
4722 timeout_ms);
4723 eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm);
4724 eloop_register_timeout(timeout_ms / 1000,
4725 (timeout_ms % 1000) * 1000,
4726 wpa_send_eapol_timeout, wpa_auth, sm);
4727 }
4728
4729 #ifdef CONFIG_TESTING_OPTIONS
4730 if (sm->eapol_status_cb) {
4731 sm->eapol_status_cb(sm->eapol_status_cb_ctx1,
4732 sm->eapol_status_cb_ctx2);
4733 sm->eapol_status_cb = NULL;
4734 }
4735 #endif /* CONFIG_TESTING_OPTIONS */
4736 }
4737
4738
wpa_auth_uses_sae(struct wpa_state_machine * sm)4739 int wpa_auth_uses_sae(struct wpa_state_machine *sm)
4740 {
4741 if (sm == NULL)
4742 return 0;
4743 return wpa_key_mgmt_sae(sm->wpa_key_mgmt);
4744 }
4745
4746
wpa_auth_uses_ft_sae(struct wpa_state_machine * sm)4747 int wpa_auth_uses_ft_sae(struct wpa_state_machine *sm)
4748 {
4749 if (sm == NULL)
4750 return 0;
4751 return sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE;
4752 }
4753
4754
4755 #ifdef CONFIG_P2P
wpa_auth_get_ip_addr(struct wpa_state_machine * sm,u8 * addr)4756 int wpa_auth_get_ip_addr(struct wpa_state_machine *sm, u8 *addr)
4757 {
4758 if (sm == NULL || WPA_GET_BE32(sm->ip_addr) == 0)
4759 return -1;
4760 os_memcpy(addr, sm->ip_addr, 4);
4761 return 0;
4762 }
4763 #endif /* CONFIG_P2P */
4764
4765
wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator * wpa_auth,struct radius_das_attrs * attr)4766 int wpa_auth_radius_das_disconnect_pmksa(struct wpa_authenticator *wpa_auth,
4767 struct radius_das_attrs *attr)
4768 {
4769 return pmksa_cache_auth_radius_das_disconnect(wpa_auth->pmksa, attr);
4770 }
4771
4772
wpa_auth_reconfig_group_keys(struct wpa_authenticator * wpa_auth)4773 void wpa_auth_reconfig_group_keys(struct wpa_authenticator *wpa_auth)
4774 {
4775 struct wpa_group *group;
4776
4777 if (!wpa_auth)
4778 return;
4779 for (group = wpa_auth->group; group; group = group->next)
4780 wpa_group_config_group_keys(wpa_auth, group);
4781 }
4782
4783
4784 #ifdef CONFIG_FILS
4785
4786 struct wpa_auth_fils_iter_data {
4787 struct wpa_authenticator *auth;
4788 const u8 *cache_id;
4789 struct rsn_pmksa_cache_entry *pmksa;
4790 const u8 *spa;
4791 const u8 *pmkid;
4792 };
4793
4794
wpa_auth_fils_iter(struct wpa_authenticator * a,void * ctx)4795 static int wpa_auth_fils_iter(struct wpa_authenticator *a, void *ctx)
4796 {
4797 struct wpa_auth_fils_iter_data *data = ctx;
4798
4799 if (a == data->auth || !a->conf.fils_cache_id_set ||
4800 os_memcmp(a->conf.fils_cache_id, data->cache_id,
4801 FILS_CACHE_ID_LEN) != 0)
4802 return 0;
4803 data->pmksa = pmksa_cache_auth_get(a->pmksa, data->spa, data->pmkid);
4804 return data->pmksa != NULL;
4805 }
4806
4807
4808 struct rsn_pmksa_cache_entry *
wpa_auth_pmksa_get_fils_cache_id(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,const u8 * pmkid)4809 wpa_auth_pmksa_get_fils_cache_id(struct wpa_authenticator *wpa_auth,
4810 const u8 *sta_addr, const u8 *pmkid)
4811 {
4812 struct wpa_auth_fils_iter_data idata;
4813
4814 if (!wpa_auth->conf.fils_cache_id_set)
4815 return NULL;
4816 idata.auth = wpa_auth;
4817 idata.cache_id = wpa_auth->conf.fils_cache_id;
4818 idata.pmksa = NULL;
4819 idata.spa = sta_addr;
4820 idata.pmkid = pmkid;
4821 wpa_auth_for_each_auth(wpa_auth, wpa_auth_fils_iter, &idata);
4822 return idata.pmksa;
4823 }
4824
4825
4826 #ifdef CONFIG_IEEE80211R_AP
wpa_auth_write_fte(struct wpa_authenticator * wpa_auth,int use_sha384,u8 * buf,size_t len)4827 int wpa_auth_write_fte(struct wpa_authenticator *wpa_auth, int use_sha384,
4828 u8 *buf, size_t len)
4829 {
4830 struct wpa_auth_config *conf = &wpa_auth->conf;
4831
4832 return wpa_write_ftie(conf, use_sha384, conf->r0_key_holder,
4833 conf->r0_key_holder_len,
4834 NULL, NULL, buf, len, NULL, 0);
4835 }
4836 #endif /* CONFIG_IEEE80211R_AP */
4837
4838
wpa_auth_get_fils_aead_params(struct wpa_state_machine * sm,u8 * fils_anonce,u8 * fils_snonce,u8 * fils_kek,size_t * fils_kek_len)4839 void wpa_auth_get_fils_aead_params(struct wpa_state_machine *sm,
4840 u8 *fils_anonce, u8 *fils_snonce,
4841 u8 *fils_kek, size_t *fils_kek_len)
4842 {
4843 os_memcpy(fils_anonce, sm->ANonce, WPA_NONCE_LEN);
4844 os_memcpy(fils_snonce, sm->SNonce, WPA_NONCE_LEN);
4845 os_memcpy(fils_kek, sm->PTK.kek, WPA_KEK_MAX_LEN);
4846 *fils_kek_len = sm->PTK.kek_len;
4847 }
4848
4849 #endif /* CONFIG_FILS */
4850
4851
wpa_auth_set_auth_alg(struct wpa_state_machine * sm,u16 auth_alg)4852 void wpa_auth_set_auth_alg(struct wpa_state_machine *sm, u16 auth_alg)
4853 {
4854 if (sm)
4855 sm->auth_alg = auth_alg;
4856 }
4857
4858
4859 #ifdef CONFIG_DPP2
wpa_auth_set_dpp_z(struct wpa_state_machine * sm,const struct wpabuf * z)4860 void wpa_auth_set_dpp_z(struct wpa_state_machine *sm, const struct wpabuf *z)
4861 {
4862 if (sm) {
4863 wpabuf_clear_free(sm->dpp_z);
4864 sm->dpp_z = z ? wpabuf_dup(z) : NULL;
4865 }
4866 }
4867 #endif /* CONFIG_DPP2 */
4868
4869
4870 #ifdef CONFIG_TESTING_OPTIONS
4871
wpa_auth_resend_m1(struct wpa_state_machine * sm,int change_anonce,void (* cb)(void * ctx1,void * ctx2),void * ctx1,void * ctx2)4872 int wpa_auth_resend_m1(struct wpa_state_machine *sm, int change_anonce,
4873 void (*cb)(void *ctx1, void *ctx2),
4874 void *ctx1, void *ctx2)
4875 {
4876 const u8 *anonce = sm->ANonce;
4877 u8 anonce_buf[WPA_NONCE_LEN];
4878
4879 if (change_anonce) {
4880 if (random_get_bytes(anonce_buf, WPA_NONCE_LEN))
4881 return -1;
4882 anonce = anonce_buf;
4883 }
4884
4885 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
4886 "sending 1/4 msg of 4-Way Handshake (TESTING)");
4887 wpa_send_eapol(sm->wpa_auth, sm,
4888 WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL,
4889 anonce, NULL, 0, 0, 0);
4890 return 0;
4891 }
4892
4893
wpa_auth_resend_m3(struct wpa_state_machine * sm,void (* cb)(void * ctx1,void * ctx2),void * ctx1,void * ctx2)4894 int wpa_auth_resend_m3(struct wpa_state_machine *sm,
4895 void (*cb)(void *ctx1, void *ctx2),
4896 void *ctx1, void *ctx2)
4897 {
4898 u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos;
4899 #ifdef CONFIG_IEEE80211W
4900 u8 *opos;
4901 #endif /* CONFIG_IEEE80211W */
4902 size_t gtk_len, kde_len;
4903 struct wpa_group *gsm = sm->group;
4904 u8 *wpa_ie;
4905 int wpa_ie_len, secure, keyidx, encr = 0;
4906
4907 /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE],
4908 GTK[GN], IGTK, [FTIE], [TIE * 2])
4909 */
4910
4911 /* Use 0 RSC */
4912 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
4913 /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */
4914 wpa_ie = sm->wpa_auth->wpa_ie;
4915 wpa_ie_len = sm->wpa_auth->wpa_ie_len;
4916 if (sm->wpa == WPA_VERSION_WPA &&
4917 (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) &&
4918 wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) {
4919 /* WPA-only STA, remove RSN IE and possible MDIE */
4920 wpa_ie = wpa_ie + wpa_ie[1] + 2;
4921 if (wpa_ie[0] == WLAN_EID_MOBILITY_DOMAIN)
4922 wpa_ie = wpa_ie + wpa_ie[1] + 2;
4923 wpa_ie_len = wpa_ie[1] + 2;
4924 }
4925 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
4926 "sending 3/4 msg of 4-Way Handshake (TESTING)");
4927 if (sm->wpa == WPA_VERSION_WPA2) {
4928 /* WPA2 send GTK in the 4-way handshake */
4929 secure = 1;
4930 gtk = gsm->GTK[gsm->GN - 1];
4931 gtk_len = gsm->GTK_len;
4932 keyidx = gsm->GN;
4933 _rsc = rsc;
4934 encr = 1;
4935 } else {
4936 /* WPA does not include GTK in msg 3/4 */
4937 secure = 0;
4938 gtk = NULL;
4939 gtk_len = 0;
4940 keyidx = 0;
4941 _rsc = NULL;
4942 if (sm->rx_eapol_key_secure) {
4943 /*
4944 * It looks like Windows 7 supplicant tries to use
4945 * Secure bit in msg 2/4 after having reported Michael
4946 * MIC failure and it then rejects the 4-way handshake
4947 * if msg 3/4 does not set Secure bit. Work around this
4948 * by setting the Secure bit here even in the case of
4949 * WPA if the supplicant used it first.
4950 */
4951 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
4952 "STA used Secure bit in WPA msg 2/4 - "
4953 "set Secure for 3/4 as workaround");
4954 secure = 1;
4955 }
4956 }
4957
4958 kde_len = wpa_ie_len + ieee80211w_kde_len(sm) + ocv_oci_len(sm);
4959 if (gtk)
4960 kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len;
4961 #ifdef CONFIG_IEEE80211R_AP
4962 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
4963 kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */
4964 kde_len += 300; /* FTIE + 2 * TIE */
4965 }
4966 #endif /* CONFIG_IEEE80211R_AP */
4967 kde = os_malloc(kde_len);
4968 if (kde == NULL)
4969 return -1;
4970
4971 pos = kde;
4972 os_memcpy(pos, wpa_ie, wpa_ie_len);
4973 pos += wpa_ie_len;
4974 #ifdef CONFIG_IEEE80211R_AP
4975 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
4976 int res;
4977 size_t elen;
4978
4979 elen = pos - kde;
4980 res = wpa_insert_pmkid(kde, &elen, sm->pmk_r1_name);
4981 if (res < 0) {
4982 wpa_printf(MSG_ERROR, "FT: Failed to insert "
4983 "PMKR1Name into RSN IE in EAPOL-Key data");
4984 os_free(kde);
4985 return -1;
4986 }
4987 pos -= wpa_ie_len;
4988 pos += elen;
4989 }
4990 #endif /* CONFIG_IEEE80211R_AP */
4991 if (gtk) {
4992 u8 hdr[2];
4993 hdr[0] = keyidx & 0x03;
4994 hdr[1] = 0;
4995 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
4996 gtk, gtk_len);
4997 }
4998 #ifdef CONFIG_IEEE80211W
4999 opos = pos;
5000 pos = ieee80211w_kde_add(sm, pos);
5001 if (pos - opos >= 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN) {
5002 /* skip KDE header and keyid */
5003 opos += 2 + RSN_SELECTOR_LEN + 2;
5004 os_memset(opos, 0, 6); /* clear PN */
5005 }
5006 #endif /* CONFIG_IEEE80211W */
5007 if (ocv_oci_add(sm, &pos) < 0) {
5008 os_free(kde);
5009 return -1;
5010 }
5011
5012 #ifdef CONFIG_IEEE80211R_AP
5013 if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) {
5014 int res;
5015 struct wpa_auth_config *conf;
5016
5017 conf = &sm->wpa_auth->conf;
5018 if (sm->assoc_resp_ftie &&
5019 kde + kde_len - pos >= 2 + sm->assoc_resp_ftie[1]) {
5020 os_memcpy(pos, sm->assoc_resp_ftie,
5021 2 + sm->assoc_resp_ftie[1]);
5022 res = 2 + sm->assoc_resp_ftie[1];
5023 } else {
5024 int use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
5025
5026 res = wpa_write_ftie(conf, use_sha384,
5027 conf->r0_key_holder,
5028 conf->r0_key_holder_len,
5029 NULL, NULL, pos,
5030 kde + kde_len - pos,
5031 NULL, 0);
5032 }
5033 if (res < 0) {
5034 wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE "
5035 "into EAPOL-Key Key Data");
5036 os_free(kde);
5037 return -1;
5038 }
5039 pos += res;
5040
5041 /* TIE[ReassociationDeadline] (TU) */
5042 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
5043 *pos++ = 5;
5044 *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE;
5045 WPA_PUT_LE32(pos, conf->reassociation_deadline);
5046 pos += 4;
5047
5048 /* TIE[KeyLifetime] (seconds) */
5049 *pos++ = WLAN_EID_TIMEOUT_INTERVAL;
5050 *pos++ = 5;
5051 *pos++ = WLAN_TIMEOUT_KEY_LIFETIME;
5052 WPA_PUT_LE32(pos, conf->r0_key_lifetime);
5053 pos += 4;
5054 }
5055 #endif /* CONFIG_IEEE80211R_AP */
5056
5057 wpa_send_eapol(sm->wpa_auth, sm,
5058 (secure ? WPA_KEY_INFO_SECURE : 0) |
5059 (wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len) ?
5060 WPA_KEY_INFO_MIC : 0) |
5061 WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL |
5062 WPA_KEY_INFO_KEY_TYPE,
5063 _rsc, sm->ANonce, kde, pos - kde, keyidx, encr);
5064 os_free(kde);
5065 return 0;
5066 }
5067
5068
wpa_auth_resend_group_m1(struct wpa_state_machine * sm,void (* cb)(void * ctx1,void * ctx2),void * ctx1,void * ctx2)5069 int wpa_auth_resend_group_m1(struct wpa_state_machine *sm,
5070 void (*cb)(void *ctx1, void *ctx2),
5071 void *ctx1, void *ctx2)
5072 {
5073 u8 rsc[WPA_KEY_RSC_LEN];
5074 struct wpa_group *gsm = sm->group;
5075 const u8 *kde;
5076 u8 *kde_buf = NULL, *pos, hdr[2];
5077 #ifdef CONFIG_IEEE80211W
5078 u8 *opos;
5079 #endif /* CONFIG_IEEE80211W */
5080 size_t kde_len;
5081 u8 *gtk;
5082
5083 /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */
5084 os_memset(rsc, 0, WPA_KEY_RSC_LEN);
5085 /* Use 0 RSC */
5086 wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
5087 "sending 1/2 msg of Group Key Handshake (TESTING)");
5088
5089 gtk = gsm->GTK[gsm->GN - 1];
5090 if (sm->wpa == WPA_VERSION_WPA2) {
5091 kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len +
5092 ieee80211w_kde_len(sm) + ocv_oci_len(sm);
5093 kde_buf = os_malloc(kde_len);
5094 if (kde_buf == NULL)
5095 return -1;
5096
5097 kde = pos = kde_buf;
5098 hdr[0] = gsm->GN & 0x03;
5099 hdr[1] = 0;
5100 pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2,
5101 gtk, gsm->GTK_len);
5102 #ifdef CONFIG_IEEE80211W
5103 opos = pos;
5104 pos = ieee80211w_kde_add(sm, pos);
5105 if (pos - opos >=
5106 2 + RSN_SELECTOR_LEN + WPA_IGTK_KDE_PREFIX_LEN) {
5107 /* skip KDE header and keyid */
5108 opos += 2 + RSN_SELECTOR_LEN + 2;
5109 os_memset(opos, 0, 6); /* clear PN */
5110 }
5111 #endif /* CONFIG_IEEE80211W */
5112 if (ocv_oci_add(sm, &pos) < 0) {
5113 os_free(kde_buf);
5114 return -1;
5115 }
5116 kde_len = pos - kde;
5117 } else {
5118 kde = gtk;
5119 kde_len = gsm->GTK_len;
5120 }
5121
5122 sm->eapol_status_cb = cb;
5123 sm->eapol_status_cb_ctx1 = ctx1;
5124 sm->eapol_status_cb_ctx2 = ctx2;
5125
5126 wpa_send_eapol(sm->wpa_auth, sm,
5127 WPA_KEY_INFO_SECURE |
5128 (wpa_mic_len(sm->wpa_key_mgmt, sm->pmk_len) ?
5129 WPA_KEY_INFO_MIC : 0) |
5130 WPA_KEY_INFO_ACK |
5131 (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0),
5132 rsc, NULL, kde, kde_len, gsm->GN, 1);
5133
5134 os_free(kde_buf);
5135 return 0;
5136 }
5137
5138
wpa_auth_rekey_gtk(struct wpa_authenticator * wpa_auth)5139 int wpa_auth_rekey_gtk(struct wpa_authenticator *wpa_auth)
5140 {
5141 if (!wpa_auth)
5142 return -1;
5143 eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL);
5144 return eloop_register_timeout(0, 0, wpa_rekey_gtk, wpa_auth, NULL);
5145 }
5146
5147 #endif /* CONFIG_TESTING_OPTIONS */
5148