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Commit | Line | Data |
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6fc6879b | 1 | /* |
00338a4f JM |
2 | * IEEE 802.11 RSN / WPA Authenticator |
3 | * Copyright (c) 2004-2011, Jouni Malinen <j@w1.fi> | |
6fc6879b | 4 | * |
0f3d578e JM |
5 | * This software may be distributed under the terms of the BSD license. |
6 | * See README for more details. | |
6fc6879b JM |
7 | */ |
8 | ||
6226e38d | 9 | #include "utils/includes.h" |
6fc6879b | 10 | |
6226e38d JM |
11 | #include "utils/common.h" |
12 | #include "utils/eloop.h" | |
13 | #include "utils/state_machine.h" | |
81f4f619 | 14 | #include "common/ieee802_11_defs.h" |
03da66bd JM |
15 | #include "crypto/aes_wrap.h" |
16 | #include "crypto/crypto.h" | |
17 | #include "crypto/sha1.h" | |
18 | #include "crypto/sha256.h" | |
3642c431 | 19 | #include "crypto/random.h" |
281c950b | 20 | #include "eapol_auth/eapol_auth_sm.h" |
6226e38d | 21 | #include "ap_config.h" |
6fc6879b | 22 | #include "ieee802_11.h" |
6226e38d JM |
23 | #include "wpa_auth.h" |
24 | #include "pmksa_cache_auth.h" | |
6fc6879b JM |
25 | #include "wpa_auth_i.h" |
26 | #include "wpa_auth_ie.h" | |
27 | ||
28 | #define STATE_MACHINE_DATA struct wpa_state_machine | |
29 | #define STATE_MACHINE_DEBUG_PREFIX "WPA" | |
30 | #define STATE_MACHINE_ADDR sm->addr | |
31 | ||
32 | ||
33 | static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx); | |
e4a6ea1d | 34 | static int wpa_sm_step(struct wpa_state_machine *sm); |
6fc6879b JM |
35 | static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len); |
36 | static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx); | |
37 | static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, | |
38 | struct wpa_group *group); | |
581a8cde | 39 | static void wpa_request_new_ptk(struct wpa_state_machine *sm); |
e6965d4e JM |
40 | static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, |
41 | struct wpa_group *group); | |
1bdb7ab3 JM |
42 | static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, |
43 | struct wpa_group *group); | |
6fc6879b | 44 | |
bae61562 JM |
45 | static const u32 dot11RSNAConfigGroupUpdateCount = 4; |
46 | static const u32 dot11RSNAConfigPairwiseUpdateCount = 4; | |
47 | static const u32 eapol_key_timeout_first = 100; /* ms */ | |
48 | static const u32 eapol_key_timeout_subseq = 1000; /* ms */ | |
00338a4f | 49 | static const u32 eapol_key_timeout_first_group = 500; /* ms */ |
6fc6879b JM |
50 | |
51 | /* TODO: make these configurable */ | |
52 | static const int dot11RSNAConfigPMKLifetime = 43200; | |
53 | static const int dot11RSNAConfigPMKReauthThreshold = 70; | |
54 | static const int dot11RSNAConfigSATimeout = 60; | |
55 | ||
56 | ||
57 | static inline void wpa_auth_mic_failure_report( | |
58 | struct wpa_authenticator *wpa_auth, const u8 *addr) | |
59 | { | |
60 | if (wpa_auth->cb.mic_failure_report) | |
61 | wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr); | |
62 | } | |
63 | ||
64 | ||
65 | static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth, | |
66 | const u8 *addr, wpa_eapol_variable var, | |
67 | int value) | |
68 | { | |
69 | if (wpa_auth->cb.set_eapol) | |
70 | wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value); | |
71 | } | |
72 | ||
73 | ||
74 | static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth, | |
75 | const u8 *addr, wpa_eapol_variable var) | |
76 | { | |
77 | if (wpa_auth->cb.get_eapol == NULL) | |
78 | return -1; | |
79 | return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var); | |
80 | } | |
81 | ||
82 | ||
83 | static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth, | |
84 | const u8 *addr, const u8 *prev_psk) | |
85 | { | |
86 | if (wpa_auth->cb.get_psk == NULL) | |
87 | return NULL; | |
88 | return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, prev_psk); | |
89 | } | |
90 | ||
91 | ||
92 | static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth, | |
93 | const u8 *addr, u8 *msk, size_t *len) | |
94 | { | |
95 | if (wpa_auth->cb.get_msk == NULL) | |
96 | return -1; | |
97 | return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len); | |
98 | } | |
99 | ||
100 | ||
101 | static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, | |
102 | int vlan_id, | |
71934751 | 103 | enum wpa_alg alg, const u8 *addr, int idx, |
6fc6879b JM |
104 | u8 *key, size_t key_len) |
105 | { | |
106 | if (wpa_auth->cb.set_key == NULL) | |
107 | return -1; | |
108 | return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, | |
109 | key, key_len); | |
110 | } | |
111 | ||
112 | ||
113 | static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, | |
114 | const u8 *addr, int idx, u8 *seq) | |
115 | { | |
116 | if (wpa_auth->cb.get_seqnum == NULL) | |
117 | return -1; | |
118 | return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); | |
119 | } | |
120 | ||
121 | ||
6fc6879b JM |
122 | static inline int |
123 | wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr, | |
124 | const u8 *data, size_t data_len, int encrypt) | |
125 | { | |
126 | if (wpa_auth->cb.send_eapol == NULL) | |
127 | return -1; | |
128 | return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len, | |
129 | encrypt); | |
130 | } | |
131 | ||
132 | ||
133 | int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth, | |
134 | int (*cb)(struct wpa_state_machine *sm, void *ctx), | |
135 | void *cb_ctx) | |
136 | { | |
137 | if (wpa_auth->cb.for_each_sta == NULL) | |
138 | return 0; | |
139 | return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx); | |
140 | } | |
141 | ||
142 | ||
bf98f7f3 JM |
143 | int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth, |
144 | int (*cb)(struct wpa_authenticator *a, void *ctx), | |
145 | void *cb_ctx) | |
146 | { | |
147 | if (wpa_auth->cb.for_each_auth == NULL) | |
148 | return 0; | |
149 | return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx); | |
150 | } | |
151 | ||
152 | ||
6fc6879b JM |
153 | void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr, |
154 | logger_level level, const char *txt) | |
155 | { | |
156 | if (wpa_auth->cb.logger == NULL) | |
157 | return; | |
158 | wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt); | |
159 | } | |
160 | ||
161 | ||
162 | void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr, | |
163 | logger_level level, const char *fmt, ...) | |
164 | { | |
165 | char *format; | |
166 | int maxlen; | |
167 | va_list ap; | |
168 | ||
169 | if (wpa_auth->cb.logger == NULL) | |
170 | return; | |
171 | ||
172 | maxlen = os_strlen(fmt) + 100; | |
173 | format = os_malloc(maxlen); | |
174 | if (!format) | |
175 | return; | |
176 | ||
177 | va_start(ap, fmt); | |
178 | vsnprintf(format, maxlen, fmt, ap); | |
179 | va_end(ap); | |
180 | ||
181 | wpa_auth_logger(wpa_auth, addr, level, format); | |
182 | ||
183 | os_free(format); | |
184 | } | |
185 | ||
186 | ||
187 | static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth, | |
188 | const u8 *addr) | |
189 | { | |
190 | if (wpa_auth->cb.disconnect == NULL) | |
191 | return; | |
afcc9ea1 | 192 | wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr)); |
6fc6879b JM |
193 | wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr, |
194 | WLAN_REASON_PREV_AUTH_NOT_VALID); | |
195 | } | |
196 | ||
197 | ||
198 | static int wpa_use_aes_cmac(struct wpa_state_machine *sm) | |
199 | { | |
56586197 | 200 | int ret = 0; |
6fc6879b | 201 | #ifdef CONFIG_IEEE80211R |
56586197 JM |
202 | if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) |
203 | ret = 1; | |
6fc6879b | 204 | #endif /* CONFIG_IEEE80211R */ |
56586197 JM |
205 | #ifdef CONFIG_IEEE80211W |
206 | if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt)) | |
207 | ret = 1; | |
208 | #endif /* CONFIG_IEEE80211W */ | |
209 | return ret; | |
6fc6879b JM |
210 | } |
211 | ||
212 | ||
213 | static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx) | |
214 | { | |
215 | struct wpa_authenticator *wpa_auth = eloop_ctx; | |
216 | ||
3642c431 | 217 | if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) { |
6fc6879b JM |
218 | wpa_printf(MSG_ERROR, "Failed to get random data for WPA " |
219 | "initialization."); | |
220 | } else { | |
221 | wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd"); | |
5cb9d5c3 JM |
222 | wpa_hexdump_key(MSG_DEBUG, "GMK", |
223 | wpa_auth->group->GMK, WPA_GMK_LEN); | |
6fc6879b JM |
224 | } |
225 | ||
226 | if (wpa_auth->conf.wpa_gmk_rekey) { | |
227 | eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, | |
228 | wpa_rekey_gmk, wpa_auth, NULL); | |
229 | } | |
230 | } | |
231 | ||
232 | ||
233 | static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx) | |
234 | { | |
235 | struct wpa_authenticator *wpa_auth = eloop_ctx; | |
236 | struct wpa_group *group; | |
237 | ||
238 | wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK"); | |
239 | for (group = wpa_auth->group; group; group = group->next) { | |
240 | group->GTKReKey = TRUE; | |
241 | do { | |
242 | group->changed = FALSE; | |
243 | wpa_group_sm_step(wpa_auth, group); | |
244 | } while (group->changed); | |
245 | } | |
246 | ||
247 | if (wpa_auth->conf.wpa_group_rekey) { | |
248 | eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, | |
249 | 0, wpa_rekey_gtk, wpa_auth, NULL); | |
250 | } | |
251 | } | |
252 | ||
253 | ||
581a8cde JM |
254 | static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx) |
255 | { | |
256 | struct wpa_authenticator *wpa_auth = eloop_ctx; | |
257 | struct wpa_state_machine *sm = timeout_ctx; | |
258 | ||
259 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK"); | |
260 | wpa_request_new_ptk(sm); | |
261 | wpa_sm_step(sm); | |
262 | } | |
263 | ||
264 | ||
6fc6879b JM |
265 | static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx) |
266 | { | |
267 | if (sm->pmksa == ctx) | |
268 | sm->pmksa = NULL; | |
269 | return 0; | |
270 | } | |
271 | ||
272 | ||
273 | static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry, | |
274 | void *ctx) | |
275 | { | |
276 | struct wpa_authenticator *wpa_auth = ctx; | |
277 | wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry); | |
278 | } | |
279 | ||
280 | ||
1bdb7ab3 JM |
281 | static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth, |
282 | struct wpa_group *group) | |
283 | { | |
284 | u8 buf[ETH_ALEN + 8 + sizeof(group)]; | |
285 | u8 rkey[32]; | |
286 | ||
3642c431 | 287 | if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0) |
1bdb7ab3 JM |
288 | return -1; |
289 | wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN); | |
290 | ||
291 | /* | |
292 | * Counter = PRF-256(Random number, "Init Counter", | |
293 | * Local MAC Address || Time) | |
294 | */ | |
295 | os_memcpy(buf, wpa_auth->addr, ETH_ALEN); | |
296 | wpa_get_ntp_timestamp(buf + ETH_ALEN); | |
297 | os_memcpy(buf + ETH_ALEN + 8, &group, sizeof(group)); | |
3642c431 | 298 | if (random_get_bytes(rkey, sizeof(rkey)) < 0) |
1bdb7ab3 JM |
299 | return -1; |
300 | ||
301 | if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf), | |
302 | group->Counter, WPA_NONCE_LEN) < 0) | |
303 | return -1; | |
304 | wpa_hexdump_key(MSG_DEBUG, "Key Counter", | |
305 | group->Counter, WPA_NONCE_LEN); | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | ||
e6965d4e | 311 | static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth, |
bdffdc5d | 312 | int vlan_id, int delay_init) |
e6965d4e JM |
313 | { |
314 | struct wpa_group *group; | |
e6965d4e JM |
315 | |
316 | group = os_zalloc(sizeof(struct wpa_group)); | |
317 | if (group == NULL) | |
318 | return NULL; | |
319 | ||
320 | group->GTKAuthenticator = TRUE; | |
321 | group->vlan_id = vlan_id; | |
c3550295 | 322 | group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); |
6fc6879b | 323 | |
08704cd8 JM |
324 | if (random_pool_ready() != 1) { |
325 | wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " | |
326 | "for secure operations - update keys later when " | |
327 | "the first station connects"); | |
328 | } | |
329 | ||
1bdb7ab3 JM |
330 | /* |
331 | * Set initial GMK/Counter value here. The actual values that will be | |
332 | * used in negotiations will be set once the first station tries to | |
333 | * connect. This allows more time for collecting additional randomness | |
334 | * on embedded devices. | |
6fc6879b | 335 | */ |
1bdb7ab3 | 336 | if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) { |
6fc6879b JM |
337 | wpa_printf(MSG_ERROR, "Failed to get random data for WPA " |
338 | "initialization."); | |
339 | os_free(group); | |
340 | return NULL; | |
341 | } | |
6fc6879b JM |
342 | |
343 | group->GInit = TRUE; | |
bdffdc5d JM |
344 | if (delay_init) { |
345 | wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start " | |
346 | "until Beacon frames have been configured"); | |
347 | /* Initialization is completed in wpa_init_keys(). */ | |
348 | } else { | |
349 | wpa_group_sm_step(wpa_auth, group); | |
350 | group->GInit = FALSE; | |
351 | wpa_group_sm_step(wpa_auth, group); | |
352 | } | |
6fc6879b JM |
353 | |
354 | return group; | |
355 | } | |
356 | ||
357 | ||
358 | /** | |
359 | * wpa_init - Initialize WPA authenticator | |
360 | * @addr: Authenticator address | |
361 | * @conf: Configuration for WPA authenticator | |
a17df5fb | 362 | * @cb: Callback functions for WPA authenticator |
6fc6879b JM |
363 | * Returns: Pointer to WPA authenticator data or %NULL on failure |
364 | */ | |
365 | struct wpa_authenticator * wpa_init(const u8 *addr, | |
366 | struct wpa_auth_config *conf, | |
367 | struct wpa_auth_callbacks *cb) | |
368 | { | |
369 | struct wpa_authenticator *wpa_auth; | |
370 | ||
371 | wpa_auth = os_zalloc(sizeof(struct wpa_authenticator)); | |
372 | if (wpa_auth == NULL) | |
373 | return NULL; | |
374 | os_memcpy(wpa_auth->addr, addr, ETH_ALEN); | |
375 | os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); | |
376 | os_memcpy(&wpa_auth->cb, cb, sizeof(*cb)); | |
377 | ||
378 | if (wpa_auth_gen_wpa_ie(wpa_auth)) { | |
379 | wpa_printf(MSG_ERROR, "Could not generate WPA IE."); | |
380 | os_free(wpa_auth); | |
381 | return NULL; | |
382 | } | |
383 | ||
bdffdc5d | 384 | wpa_auth->group = wpa_group_init(wpa_auth, 0, 1); |
6fc6879b JM |
385 | if (wpa_auth->group == NULL) { |
386 | os_free(wpa_auth->wpa_ie); | |
387 | os_free(wpa_auth); | |
388 | return NULL; | |
389 | } | |
390 | ||
4bb081f1 JM |
391 | wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb, |
392 | wpa_auth); | |
6fc6879b JM |
393 | if (wpa_auth->pmksa == NULL) { |
394 | wpa_printf(MSG_ERROR, "PMKSA cache initialization failed."); | |
395 | os_free(wpa_auth->wpa_ie); | |
396 | os_free(wpa_auth); | |
397 | return NULL; | |
398 | } | |
399 | ||
400 | #ifdef CONFIG_IEEE80211R | |
401 | wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init(); | |
402 | if (wpa_auth->ft_pmk_cache == NULL) { | |
403 | wpa_printf(MSG_ERROR, "FT PMK cache initialization failed."); | |
404 | os_free(wpa_auth->wpa_ie); | |
4bb081f1 | 405 | pmksa_cache_auth_deinit(wpa_auth->pmksa); |
6fc6879b JM |
406 | os_free(wpa_auth); |
407 | return NULL; | |
408 | } | |
409 | #endif /* CONFIG_IEEE80211R */ | |
410 | ||
411 | if (wpa_auth->conf.wpa_gmk_rekey) { | |
412 | eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, | |
413 | wpa_rekey_gmk, wpa_auth, NULL); | |
414 | } | |
415 | ||
416 | if (wpa_auth->conf.wpa_group_rekey) { | |
417 | eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0, | |
418 | wpa_rekey_gtk, wpa_auth, NULL); | |
419 | } | |
420 | ||
421 | return wpa_auth; | |
422 | } | |
423 | ||
424 | ||
bdffdc5d JM |
425 | int wpa_init_keys(struct wpa_authenticator *wpa_auth) |
426 | { | |
427 | struct wpa_group *group = wpa_auth->group; | |
428 | ||
429 | wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial " | |
430 | "keys"); | |
431 | wpa_group_sm_step(wpa_auth, group); | |
432 | group->GInit = FALSE; | |
433 | wpa_group_sm_step(wpa_auth, group); | |
434 | return 0; | |
435 | } | |
436 | ||
437 | ||
6fc6879b JM |
438 | /** |
439 | * wpa_deinit - Deinitialize WPA authenticator | |
440 | * @wpa_auth: Pointer to WPA authenticator data from wpa_init() | |
441 | */ | |
442 | void wpa_deinit(struct wpa_authenticator *wpa_auth) | |
443 | { | |
444 | struct wpa_group *group, *prev; | |
445 | ||
446 | eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL); | |
447 | eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); | |
448 | ||
449 | #ifdef CONFIG_PEERKEY | |
450 | while (wpa_auth->stsl_negotiations) | |
451 | wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations); | |
452 | #endif /* CONFIG_PEERKEY */ | |
453 | ||
4bb081f1 | 454 | pmksa_cache_auth_deinit(wpa_auth->pmksa); |
6fc6879b JM |
455 | |
456 | #ifdef CONFIG_IEEE80211R | |
457 | wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache); | |
458 | wpa_auth->ft_pmk_cache = NULL; | |
459 | #endif /* CONFIG_IEEE80211R */ | |
460 | ||
461 | os_free(wpa_auth->wpa_ie); | |
462 | ||
463 | group = wpa_auth->group; | |
464 | while (group) { | |
465 | prev = group; | |
466 | group = group->next; | |
467 | os_free(prev); | |
468 | } | |
469 | ||
470 | os_free(wpa_auth); | |
471 | } | |
472 | ||
473 | ||
474 | /** | |
475 | * wpa_reconfig - Update WPA authenticator configuration | |
476 | * @wpa_auth: Pointer to WPA authenticator data from wpa_init() | |
477 | * @conf: Configuration for WPA authenticator | |
478 | */ | |
479 | int wpa_reconfig(struct wpa_authenticator *wpa_auth, | |
480 | struct wpa_auth_config *conf) | |
481 | { | |
e6965d4e | 482 | struct wpa_group *group; |
6fc6879b JM |
483 | if (wpa_auth == NULL) |
484 | return 0; | |
485 | ||
486 | os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); | |
ad08c363 JM |
487 | if (wpa_auth_gen_wpa_ie(wpa_auth)) { |
488 | wpa_printf(MSG_ERROR, "Could not generate WPA IE."); | |
489 | return -1; | |
490 | } | |
491 | ||
e6965d4e JM |
492 | /* |
493 | * Reinitialize GTK to make sure it is suitable for the new | |
494 | * configuration. | |
495 | */ | |
496 | group = wpa_auth->group; | |
c3550295 | 497 | group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); |
e6965d4e JM |
498 | group->GInit = TRUE; |
499 | wpa_group_sm_step(wpa_auth, group); | |
500 | group->GInit = FALSE; | |
501 | wpa_group_sm_step(wpa_auth, group); | |
502 | ||
6fc6879b JM |
503 | return 0; |
504 | } | |
505 | ||
506 | ||
507 | struct wpa_state_machine * | |
508 | wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr) | |
509 | { | |
510 | struct wpa_state_machine *sm; | |
511 | ||
512 | sm = os_zalloc(sizeof(struct wpa_state_machine)); | |
513 | if (sm == NULL) | |
514 | return NULL; | |
515 | os_memcpy(sm->addr, addr, ETH_ALEN); | |
516 | ||
517 | sm->wpa_auth = wpa_auth; | |
518 | sm->group = wpa_auth->group; | |
519 | ||
520 | return sm; | |
521 | } | |
522 | ||
523 | ||
6f9b5d16 JM |
524 | int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth, |
525 | struct wpa_state_machine *sm) | |
6fc6879b JM |
526 | { |
527 | if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) | |
6f9b5d16 | 528 | return -1; |
6fc6879b JM |
529 | |
530 | #ifdef CONFIG_IEEE80211R | |
531 | if (sm->ft_completed) { | |
532 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
533 | "FT authentication already completed - do not " | |
534 | "start 4-way handshake"); | |
6f9b5d16 | 535 | return 0; |
6fc6879b JM |
536 | } |
537 | #endif /* CONFIG_IEEE80211R */ | |
538 | ||
539 | if (sm->started) { | |
22a299ee | 540 | os_memset(&sm->key_replay, 0, sizeof(sm->key_replay)); |
6fc6879b | 541 | sm->ReAuthenticationRequest = TRUE; |
6f9b5d16 | 542 | return wpa_sm_step(sm); |
6fc6879b JM |
543 | } |
544 | ||
545 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
546 | "start authentication"); | |
547 | sm->started = 1; | |
548 | ||
549 | sm->Init = TRUE; | |
e4a6ea1d | 550 | if (wpa_sm_step(sm) == 1) |
6f9b5d16 | 551 | return 1; /* should not really happen */ |
6fc6879b JM |
552 | sm->Init = FALSE; |
553 | sm->AuthenticationRequest = TRUE; | |
6f9b5d16 | 554 | return wpa_sm_step(sm); |
6fc6879b JM |
555 | } |
556 | ||
557 | ||
a8d05fca JM |
558 | void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm) |
559 | { | |
560 | /* WPA/RSN was not used - clear WPA state. This is needed if the STA | |
561 | * reassociates back to the same AP while the previous entry for the | |
562 | * STA has not yet been removed. */ | |
563 | if (sm == NULL) | |
564 | return; | |
565 | ||
566 | sm->wpa_key_mgmt = 0; | |
567 | } | |
568 | ||
569 | ||
6fc6879b JM |
570 | static void wpa_free_sta_sm(struct wpa_state_machine *sm) |
571 | { | |
2ade8ef2 JM |
572 | if (sm->GUpdateStationKeys) { |
573 | sm->group->GKeyDoneStations--; | |
574 | sm->GUpdateStationKeys = FALSE; | |
575 | } | |
0f857f43 JM |
576 | #ifdef CONFIG_IEEE80211R |
577 | os_free(sm->assoc_resp_ftie); | |
578 | #endif /* CONFIG_IEEE80211R */ | |
6fc6879b JM |
579 | os_free(sm->last_rx_eapol_key); |
580 | os_free(sm->wpa_ie); | |
581 | os_free(sm); | |
582 | } | |
583 | ||
584 | ||
585 | void wpa_auth_sta_deinit(struct wpa_state_machine *sm) | |
586 | { | |
587 | if (sm == NULL) | |
588 | return; | |
589 | ||
590 | if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) { | |
591 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
592 | "strict rekeying - force GTK rekey since STA " | |
593 | "is leaving"); | |
594 | eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL); | |
595 | eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth, | |
596 | NULL); | |
597 | } | |
598 | ||
599 | eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); | |
e4bf4db9 | 600 | sm->pending_1_of_4_timeout = 0; |
6fc6879b | 601 | eloop_cancel_timeout(wpa_sm_call_step, sm, NULL); |
581a8cde | 602 | eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); |
6fc6879b JM |
603 | if (sm->in_step_loop) { |
604 | /* Must not free state machine while wpa_sm_step() is running. | |
605 | * Freeing will be completed in the end of wpa_sm_step(). */ | |
606 | wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state " | |
607 | "machine deinit for " MACSTR, MAC2STR(sm->addr)); | |
608 | sm->pending_deinit = 1; | |
609 | } else | |
610 | wpa_free_sta_sm(sm); | |
611 | } | |
612 | ||
613 | ||
614 | static void wpa_request_new_ptk(struct wpa_state_machine *sm) | |
615 | { | |
616 | if (sm == NULL) | |
617 | return; | |
618 | ||
619 | sm->PTKRequest = TRUE; | |
620 | sm->PTK_valid = 0; | |
621 | } | |
622 | ||
623 | ||
68921e24 | 624 | static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr, |
22a299ee JM |
625 | const u8 *replay_counter) |
626 | { | |
627 | int i; | |
628 | for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { | |
68921e24 | 629 | if (!ctr[i].valid) |
22a299ee | 630 | break; |
68921e24 | 631 | if (os_memcmp(replay_counter, ctr[i].counter, |
22a299ee JM |
632 | WPA_REPLAY_COUNTER_LEN) == 0) |
633 | return 1; | |
634 | } | |
635 | return 0; | |
636 | } | |
637 | ||
638 | ||
68921e24 JM |
639 | static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr, |
640 | const u8 *replay_counter) | |
641 | { | |
642 | int i; | |
643 | for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { | |
644 | if (ctr[i].valid && | |
645 | (replay_counter == NULL || | |
646 | os_memcmp(replay_counter, ctr[i].counter, | |
647 | WPA_REPLAY_COUNTER_LEN) == 0)) | |
648 | ctr[i].valid = FALSE; | |
649 | } | |
650 | } | |
651 | ||
652 | ||
0f857f43 JM |
653 | #ifdef CONFIG_IEEE80211R |
654 | static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth, | |
655 | struct wpa_state_machine *sm, | |
656 | struct wpa_eapol_ie_parse *kde) | |
657 | { | |
658 | struct wpa_ie_data ie; | |
659 | struct rsn_mdie *mdie; | |
660 | ||
661 | if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 || | |
662 | ie.num_pmkid != 1 || ie.pmkid == NULL) { | |
663 | wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in " | |
664 | "FT 4-way handshake message 2/4"); | |
665 | return -1; | |
666 | } | |
667 | ||
668 | os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN); | |
669 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant", | |
670 | sm->sup_pmk_r1_name, PMKID_LEN); | |
671 | ||
672 | if (!kde->mdie || !kde->ftie) { | |
673 | wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake " | |
674 | "message 2/4", kde->mdie ? "FTIE" : "MDIE"); | |
675 | return -1; | |
676 | } | |
677 | ||
678 | mdie = (struct rsn_mdie *) (kde->mdie + 2); | |
679 | if (kde->mdie[1] < sizeof(struct rsn_mdie) || | |
680 | os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain, | |
681 | MOBILITY_DOMAIN_ID_LEN) != 0) { | |
682 | wpa_printf(MSG_DEBUG, "FT: MDIE mismatch"); | |
683 | return -1; | |
684 | } | |
685 | ||
686 | if (sm->assoc_resp_ftie && | |
687 | (kde->ftie[1] != sm->assoc_resp_ftie[1] || | |
688 | os_memcmp(kde->ftie, sm->assoc_resp_ftie, | |
689 | 2 + sm->assoc_resp_ftie[1]) != 0)) { | |
690 | wpa_printf(MSG_DEBUG, "FT: FTIE mismatch"); | |
691 | wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4", | |
692 | kde->ftie, kde->ftie_len); | |
693 | wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp", | |
694 | sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]); | |
695 | return -1; | |
696 | } | |
697 | ||
698 | return 0; | |
699 | } | |
700 | #endif /* CONFIG_IEEE80211R */ | |
701 | ||
702 | ||
ec027805 JM |
703 | static void wpa_receive_error_report(struct wpa_authenticator *wpa_auth, |
704 | struct wpa_state_machine *sm, int group) | |
705 | { | |
706 | /* Supplicant reported a Michael MIC error */ | |
707 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, | |
708 | "received EAPOL-Key Error Request " | |
709 | "(STA detected Michael MIC failure (group=%d))", | |
710 | group); | |
fbc72d32 JM |
711 | |
712 | if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) { | |
713 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
714 | "ignore Michael MIC failure report since " | |
715 | "group cipher is not TKIP"); | |
716 | } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) { | |
717 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
718 | "ignore Michael MIC failure report since " | |
719 | "pairwise cipher is not TKIP"); | |
720 | } else { | |
721 | wpa_auth_mic_failure_report(wpa_auth, sm->addr); | |
722 | sm->dot11RSNAStatsTKIPRemoteMICFailures++; | |
723 | wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++; | |
724 | } | |
ec027805 JM |
725 | |
726 | /* | |
727 | * Error report is not a request for a new key handshake, but since | |
728 | * Authenticator may do it, let's change the keys now anyway. | |
729 | */ | |
730 | wpa_request_new_ptk(sm); | |
731 | } | |
732 | ||
733 | ||
6fc6879b JM |
734 | void wpa_receive(struct wpa_authenticator *wpa_auth, |
735 | struct wpa_state_machine *sm, | |
736 | u8 *data, size_t data_len) | |
737 | { | |
738 | struct ieee802_1x_hdr *hdr; | |
739 | struct wpa_eapol_key *key; | |
740 | u16 key_info, key_data_length; | |
741 | enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST, | |
742 | SMK_M1, SMK_M3, SMK_ERROR } msg; | |
743 | char *msgtxt; | |
744 | struct wpa_eapol_ie_parse kde; | |
26e23750 | 745 | int ft; |
1566ec46 JM |
746 | const u8 *eapol_key_ie; |
747 | size_t eapol_key_ie_len; | |
6fc6879b JM |
748 | |
749 | if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) | |
750 | return; | |
751 | ||
752 | if (data_len < sizeof(*hdr) + sizeof(*key)) | |
753 | return; | |
754 | ||
755 | hdr = (struct ieee802_1x_hdr *) data; | |
756 | key = (struct wpa_eapol_key *) (hdr + 1); | |
757 | key_info = WPA_GET_BE16(key->key_info); | |
758 | key_data_length = WPA_GET_BE16(key->key_data_length); | |
0d442aff JM |
759 | wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR |
760 | " key_info=0x%x type=%u key_data_length=%u", | |
761 | MAC2STR(sm->addr), key_info, key->type, key_data_length); | |
6fc6879b JM |
762 | if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) { |
763 | wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - " | |
764 | "key_data overflow (%d > %lu)", | |
765 | key_data_length, | |
766 | (unsigned long) (data_len - sizeof(*hdr) - | |
767 | sizeof(*key))); | |
768 | return; | |
769 | } | |
770 | ||
f8e96eb6 | 771 | if (sm->wpa == WPA_VERSION_WPA2) { |
74590e71 JM |
772 | if (key->type == EAPOL_KEY_TYPE_WPA) { |
773 | /* | |
774 | * Some deployed station implementations seem to send | |
775 | * msg 4/4 with incorrect type value in WPA2 mode. | |
776 | */ | |
777 | wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key " | |
778 | "with unexpected WPA type in RSN mode"); | |
779 | } else if (key->type != EAPOL_KEY_TYPE_RSN) { | |
f8e96eb6 JM |
780 | wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " |
781 | "unexpected type %d in RSN mode", | |
782 | key->type); | |
783 | return; | |
784 | } | |
785 | } else { | |
786 | if (key->type != EAPOL_KEY_TYPE_WPA) { | |
787 | wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " | |
788 | "unexpected type %d in WPA mode", | |
789 | key->type); | |
790 | return; | |
791 | } | |
792 | } | |
793 | ||
bc8318ac JM |
794 | wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce, |
795 | WPA_NONCE_LEN); | |
796 | wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter", | |
797 | key->replay_counter, WPA_REPLAY_COUNTER_LEN); | |
798 | ||
6fc6879b JM |
799 | /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys |
800 | * are set */ | |
801 | ||
802 | if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) == | |
803 | (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) { | |
804 | if (key_info & WPA_KEY_INFO_ERROR) { | |
805 | msg = SMK_ERROR; | |
806 | msgtxt = "SMK Error"; | |
807 | } else { | |
808 | msg = SMK_M1; | |
809 | msgtxt = "SMK M1"; | |
810 | } | |
811 | } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { | |
812 | msg = SMK_M3; | |
813 | msgtxt = "SMK M3"; | |
814 | } else if (key_info & WPA_KEY_INFO_REQUEST) { | |
815 | msg = REQUEST; | |
816 | msgtxt = "Request"; | |
817 | } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) { | |
818 | msg = GROUP_2; | |
819 | msgtxt = "2/2 Group"; | |
820 | } else if (key_data_length == 0) { | |
821 | msg = PAIRWISE_4; | |
822 | msgtxt = "4/4 Pairwise"; | |
823 | } else { | |
824 | msg = PAIRWISE_2; | |
825 | msgtxt = "2/4 Pairwise"; | |
826 | } | |
827 | ||
828 | /* TODO: key_info type validation for PeerKey */ | |
829 | if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 || | |
830 | msg == GROUP_2) { | |
831 | u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK; | |
eb7719ff JM |
832 | if (sm->pairwise == WPA_CIPHER_CCMP || |
833 | sm->pairwise == WPA_CIPHER_GCMP) { | |
6fc6879b JM |
834 | if (wpa_use_aes_cmac(sm) && |
835 | ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { | |
836 | wpa_auth_logger(wpa_auth, sm->addr, | |
837 | LOGGER_WARNING, | |
838 | "advertised support for " | |
839 | "AES-128-CMAC, but did not " | |
840 | "use it"); | |
841 | return; | |
842 | } | |
843 | ||
844 | if (!wpa_use_aes_cmac(sm) && | |
845 | ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { | |
846 | wpa_auth_logger(wpa_auth, sm->addr, | |
847 | LOGGER_WARNING, | |
848 | "did not use HMAC-SHA1-AES " | |
eb7719ff | 849 | "with CCMP/GCMP"); |
6fc6879b JM |
850 | return; |
851 | } | |
852 | } | |
853 | } | |
854 | ||
855 | if (key_info & WPA_KEY_INFO_REQUEST) { | |
856 | if (sm->req_replay_counter_used && | |
857 | os_memcmp(key->replay_counter, sm->req_replay_counter, | |
858 | WPA_REPLAY_COUNTER_LEN) <= 0) { | |
859 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING, | |
860 | "received EAPOL-Key request with " | |
861 | "replayed counter"); | |
862 | return; | |
863 | } | |
864 | } | |
865 | ||
866 | if (!(key_info & WPA_KEY_INFO_REQUEST) && | |
68921e24 | 867 | !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) { |
22a299ee | 868 | int i; |
68921e24 JM |
869 | |
870 | if (msg == PAIRWISE_2 && | |
871 | wpa_replay_counter_valid(sm->prev_key_replay, | |
872 | key->replay_counter) && | |
873 | sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING && | |
874 | os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0) | |
875 | { | |
876 | /* | |
877 | * Some supplicant implementations (e.g., Windows XP | |
878 | * WZC) update SNonce for each EAPOL-Key 2/4. This | |
879 | * breaks the workaround on accepting any of the | |
880 | * pending requests, so allow the SNonce to be updated | |
881 | * even if we have already sent out EAPOL-Key 3/4. | |
882 | */ | |
883 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
884 | "Process SNonce update from STA " | |
885 | "based on retransmitted EAPOL-Key " | |
886 | "1/4"); | |
887 | sm->update_snonce = 1; | |
888 | wpa_replay_counter_mark_invalid(sm->prev_key_replay, | |
889 | key->replay_counter); | |
890 | goto continue_processing; | |
891 | } | |
892 | ||
893 | if (msg == PAIRWISE_2 && | |
894 | wpa_replay_counter_valid(sm->prev_key_replay, | |
895 | key->replay_counter) && | |
896 | sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) { | |
897 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
898 | "ignore retransmitted EAPOL-Key %s - " | |
899 | "SNonce did not change", msgtxt); | |
900 | } else { | |
901 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
902 | "received EAPOL-Key %s with " | |
903 | "unexpected replay counter", msgtxt); | |
904 | } | |
22a299ee JM |
905 | for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { |
906 | if (!sm->key_replay[i].valid) | |
907 | break; | |
908 | wpa_hexdump(MSG_DEBUG, "pending replay counter", | |
909 | sm->key_replay[i].counter, | |
910 | WPA_REPLAY_COUNTER_LEN); | |
911 | } | |
6fc6879b JM |
912 | wpa_hexdump(MSG_DEBUG, "received replay counter", |
913 | key->replay_counter, WPA_REPLAY_COUNTER_LEN); | |
914 | return; | |
915 | } | |
916 | ||
68921e24 | 917 | continue_processing: |
6fc6879b JM |
918 | switch (msg) { |
919 | case PAIRWISE_2: | |
920 | if (sm->wpa_ptk_state != WPA_PTK_PTKSTART && | |
68921e24 JM |
921 | sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING && |
922 | (!sm->update_snonce || | |
923 | sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) { | |
6fc6879b JM |
924 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, |
925 | "received EAPOL-Key msg 2/4 in " | |
926 | "invalid state (%d) - dropped", | |
927 | sm->wpa_ptk_state); | |
928 | return; | |
929 | } | |
bbb921da | 930 | random_add_randomness(key->key_nonce, WPA_NONCE_LEN); |
08704cd8 JM |
931 | if (sm->group->reject_4way_hs_for_entropy) { |
932 | /* | |
933 | * The system did not have enough entropy to generate | |
934 | * strong random numbers. Reject the first 4-way | |
935 | * handshake(s) and collect some entropy based on the | |
936 | * information from it. Once enough entropy is | |
937 | * available, the next atempt will trigger GMK/Key | |
938 | * Counter update and the station will be allowed to | |
939 | * continue. | |
940 | */ | |
941 | wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to " | |
942 | "collect more entropy for random number " | |
943 | "generation"); | |
08704cd8 | 944 | random_mark_pool_ready(); |
08704cd8 JM |
945 | wpa_sta_disconnect(wpa_auth, sm->addr); |
946 | return; | |
947 | } | |
1566ec46 JM |
948 | if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length, |
949 | &kde) < 0) { | |
950 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, | |
951 | "received EAPOL-Key msg 2/4 with " | |
952 | "invalid Key Data contents"); | |
953 | return; | |
954 | } | |
955 | if (kde.rsn_ie) { | |
956 | eapol_key_ie = kde.rsn_ie; | |
957 | eapol_key_ie_len = kde.rsn_ie_len; | |
958 | } else { | |
959 | eapol_key_ie = kde.wpa_ie; | |
960 | eapol_key_ie_len = kde.wpa_ie_len; | |
961 | } | |
26e23750 JM |
962 | ft = sm->wpa == WPA_VERSION_WPA2 && |
963 | wpa_key_mgmt_ft(sm->wpa_key_mgmt); | |
6fc6879b | 964 | if (sm->wpa_ie == NULL || |
26e23750 JM |
965 | wpa_compare_rsn_ie(ft, |
966 | sm->wpa_ie, sm->wpa_ie_len, | |
1566ec46 | 967 | eapol_key_ie, eapol_key_ie_len)) { |
6fc6879b JM |
968 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, |
969 | "WPA IE from (Re)AssocReq did not " | |
970 | "match with msg 2/4"); | |
971 | if (sm->wpa_ie) { | |
972 | wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq", | |
973 | sm->wpa_ie, sm->wpa_ie_len); | |
974 | } | |
975 | wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4", | |
1566ec46 | 976 | eapol_key_ie, eapol_key_ie_len); |
6fc6879b JM |
977 | /* MLME-DEAUTHENTICATE.request */ |
978 | wpa_sta_disconnect(wpa_auth, sm->addr); | |
979 | return; | |
980 | } | |
26e23750 | 981 | #ifdef CONFIG_IEEE80211R |
0f857f43 JM |
982 | if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) { |
983 | wpa_sta_disconnect(wpa_auth, sm->addr); | |
984 | return; | |
26e23750 JM |
985 | } |
986 | #endif /* CONFIG_IEEE80211R */ | |
6fc6879b JM |
987 | break; |
988 | case PAIRWISE_4: | |
989 | if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING || | |
990 | !sm->PTK_valid) { | |
991 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, | |
992 | "received EAPOL-Key msg 4/4 in " | |
993 | "invalid state (%d) - dropped", | |
994 | sm->wpa_ptk_state); | |
995 | return; | |
996 | } | |
997 | break; | |
998 | case GROUP_2: | |
999 | if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING | |
1000 | || !sm->PTK_valid) { | |
1001 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, | |
1002 | "received EAPOL-Key msg 2/2 in " | |
1003 | "invalid state (%d) - dropped", | |
1004 | sm->wpa_ptk_group_state); | |
1005 | return; | |
1006 | } | |
1007 | break; | |
1008 | #ifdef CONFIG_PEERKEY | |
1009 | case SMK_M1: | |
1010 | case SMK_M3: | |
1011 | case SMK_ERROR: | |
1012 | if (!wpa_auth->conf.peerkey) { | |
1013 | wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but " | |
1014 | "PeerKey use disabled - ignoring message"); | |
1015 | return; | |
1016 | } | |
1017 | if (!sm->PTK_valid) { | |
1018 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1019 | "received EAPOL-Key msg SMK in " | |
1020 | "invalid state - dropped"); | |
1021 | return; | |
1022 | } | |
1023 | break; | |
1024 | #else /* CONFIG_PEERKEY */ | |
1025 | case SMK_M1: | |
1026 | case SMK_M3: | |
1027 | case SMK_ERROR: | |
1028 | return; /* STSL disabled - ignore SMK messages */ | |
1029 | #endif /* CONFIG_PEERKEY */ | |
1030 | case REQUEST: | |
1031 | break; | |
1032 | } | |
1033 | ||
1034 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
1035 | "received EAPOL-Key frame (%s)", msgtxt); | |
1036 | ||
1037 | if (key_info & WPA_KEY_INFO_ACK) { | |
1038 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1039 | "received invalid EAPOL-Key: Key Ack set"); | |
1040 | return; | |
1041 | } | |
1042 | ||
1043 | if (!(key_info & WPA_KEY_INFO_MIC)) { | |
1044 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1045 | "received invalid EAPOL-Key: Key MIC not set"); | |
1046 | return; | |
1047 | } | |
1048 | ||
1049 | sm->MICVerified = FALSE; | |
68921e24 | 1050 | if (sm->PTK_valid && !sm->update_snonce) { |
6fc6879b JM |
1051 | if (wpa_verify_key_mic(&sm->PTK, data, data_len)) { |
1052 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1053 | "received EAPOL-Key with invalid MIC"); | |
1054 | return; | |
1055 | } | |
1056 | sm->MICVerified = TRUE; | |
1057 | eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); | |
e4bf4db9 | 1058 | sm->pending_1_of_4_timeout = 0; |
6fc6879b JM |
1059 | } |
1060 | ||
1061 | if (key_info & WPA_KEY_INFO_REQUEST) { | |
1062 | if (sm->MICVerified) { | |
1063 | sm->req_replay_counter_used = 1; | |
1064 | os_memcpy(sm->req_replay_counter, key->replay_counter, | |
1065 | WPA_REPLAY_COUNTER_LEN); | |
1066 | } else { | |
1067 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1068 | "received EAPOL-Key request with " | |
1069 | "invalid MIC"); | |
1070 | return; | |
1071 | } | |
1072 | ||
1073 | /* | |
1074 | * TODO: should decrypt key data field if encryption was used; | |
1075 | * even though MAC address KDE is not normally encrypted, | |
1076 | * supplicant is allowed to encrypt it. | |
1077 | */ | |
1078 | if (msg == SMK_ERROR) { | |
1079 | #ifdef CONFIG_PEERKEY | |
1080 | wpa_smk_error(wpa_auth, sm, key); | |
1081 | #endif /* CONFIG_PEERKEY */ | |
1082 | return; | |
1083 | } else if (key_info & WPA_KEY_INFO_ERROR) { | |
ec027805 JM |
1084 | wpa_receive_error_report( |
1085 | wpa_auth, sm, | |
1086 | !(key_info & WPA_KEY_INFO_KEY_TYPE)); | |
6fc6879b JM |
1087 | } else if (key_info & WPA_KEY_INFO_KEY_TYPE) { |
1088 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1089 | "received EAPOL-Key Request for new " | |
1090 | "4-Way Handshake"); | |
1091 | wpa_request_new_ptk(sm); | |
1092 | #ifdef CONFIG_PEERKEY | |
1093 | } else if (msg == SMK_M1) { | |
1094 | wpa_smk_m1(wpa_auth, sm, key); | |
1095 | #endif /* CONFIG_PEERKEY */ | |
1096 | } else if (key_data_length > 0 && | |
1097 | wpa_parse_kde_ies((const u8 *) (key + 1), | |
1098 | key_data_length, &kde) == 0 && | |
1099 | kde.mac_addr) { | |
1100 | } else { | |
1101 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1102 | "received EAPOL-Key Request for GTK " | |
1103 | "rekeying"); | |
6fc6879b JM |
1104 | eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); |
1105 | wpa_rekey_gtk(wpa_auth, NULL); | |
1106 | } | |
1107 | } else { | |
68921e24 JM |
1108 | /* Do not allow the same key replay counter to be reused. */ |
1109 | wpa_replay_counter_mark_invalid(sm->key_replay, | |
1110 | key->replay_counter); | |
1111 | ||
1112 | if (msg == PAIRWISE_2) { | |
1113 | /* | |
1114 | * Maintain a copy of the pending EAPOL-Key frames in | |
1115 | * case the EAPOL-Key frame was retransmitted. This is | |
1116 | * needed to allow EAPOL-Key msg 2/4 reply to another | |
1117 | * pending msg 1/4 to update the SNonce to work around | |
1118 | * unexpected supplicant behavior. | |
1119 | */ | |
1120 | os_memcpy(sm->prev_key_replay, sm->key_replay, | |
1121 | sizeof(sm->key_replay)); | |
1122 | } else { | |
1123 | os_memset(sm->prev_key_replay, 0, | |
1124 | sizeof(sm->prev_key_replay)); | |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * Make sure old valid counters are not accepted anymore and | |
1129 | * do not get copied again. | |
1130 | */ | |
1131 | wpa_replay_counter_mark_invalid(sm->key_replay, NULL); | |
6fc6879b JM |
1132 | } |
1133 | ||
1134 | #ifdef CONFIG_PEERKEY | |
1135 | if (msg == SMK_M3) { | |
1136 | wpa_smk_m3(wpa_auth, sm, key); | |
1137 | return; | |
1138 | } | |
1139 | #endif /* CONFIG_PEERKEY */ | |
1140 | ||
1141 | os_free(sm->last_rx_eapol_key); | |
1142 | sm->last_rx_eapol_key = os_malloc(data_len); | |
1143 | if (sm->last_rx_eapol_key == NULL) | |
1144 | return; | |
1145 | os_memcpy(sm->last_rx_eapol_key, data, data_len); | |
1146 | sm->last_rx_eapol_key_len = data_len; | |
1147 | ||
0d442aff | 1148 | sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE); |
6fc6879b JM |
1149 | sm->EAPOLKeyReceived = TRUE; |
1150 | sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); | |
1151 | sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST); | |
1152 | os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN); | |
1153 | wpa_sm_step(sm); | |
1154 | } | |
1155 | ||
1156 | ||
3c7302c2 JM |
1157 | static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr, |
1158 | const u8 *gnonce, u8 *gtk, size_t gtk_len) | |
6fc6879b | 1159 | { |
5cb9d5c3 JM |
1160 | u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16]; |
1161 | u8 *pos; | |
3c7302c2 | 1162 | int ret = 0; |
6fc6879b | 1163 | |
5cb9d5c3 JM |
1164 | /* GTK = PRF-X(GMK, "Group key expansion", |
1165 | * AA || GNonce || Time || random data) | |
1166 | * The example described in the IEEE 802.11 standard uses only AA and | |
1167 | * GNonce as inputs here. Add some more entropy since this derivation | |
1168 | * is done only at the Authenticator and as such, does not need to be | |
1169 | * exactly same. | |
1170 | */ | |
6fc6879b JM |
1171 | os_memcpy(data, addr, ETH_ALEN); |
1172 | os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN); | |
5cb9d5c3 JM |
1173 | pos = data + ETH_ALEN + WPA_NONCE_LEN; |
1174 | wpa_get_ntp_timestamp(pos); | |
1175 | pos += 8; | |
3642c431 | 1176 | if (random_get_bytes(pos, 16) < 0) |
3c7302c2 | 1177 | ret = -1; |
6fc6879b | 1178 | |
56586197 | 1179 | #ifdef CONFIG_IEEE80211W |
5cb9d5c3 | 1180 | sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len); |
56586197 | 1181 | #else /* CONFIG_IEEE80211W */ |
3c7302c2 JM |
1182 | if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len) |
1183 | < 0) | |
1184 | ret = -1; | |
56586197 | 1185 | #endif /* CONFIG_IEEE80211W */ |
3c7302c2 JM |
1186 | |
1187 | return ret; | |
6fc6879b JM |
1188 | } |
1189 | ||
1190 | ||
1191 | static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx) | |
1192 | { | |
1193 | struct wpa_authenticator *wpa_auth = eloop_ctx; | |
1194 | struct wpa_state_machine *sm = timeout_ctx; | |
1195 | ||
e4bf4db9 | 1196 | sm->pending_1_of_4_timeout = 0; |
6fc6879b JM |
1197 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout"); |
1198 | sm->TimeoutEvt = TRUE; | |
1199 | wpa_sm_step(sm); | |
1200 | } | |
1201 | ||
1202 | ||
1203 | void __wpa_send_eapol(struct wpa_authenticator *wpa_auth, | |
1204 | struct wpa_state_machine *sm, int key_info, | |
1205 | const u8 *key_rsc, const u8 *nonce, | |
1206 | const u8 *kde, size_t kde_len, | |
1207 | int keyidx, int encr, int force_version) | |
1208 | { | |
1209 | struct ieee802_1x_hdr *hdr; | |
1210 | struct wpa_eapol_key *key; | |
1211 | size_t len; | |
1212 | int alg; | |
1213 | int key_data_len, pad_len = 0; | |
1214 | u8 *buf, *pos; | |
1215 | int version, pairwise; | |
22a299ee | 1216 | int i; |
6fc6879b JM |
1217 | |
1218 | len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key); | |
1219 | ||
1220 | if (force_version) | |
1221 | version = force_version; | |
1222 | else if (wpa_use_aes_cmac(sm)) | |
1223 | version = WPA_KEY_INFO_TYPE_AES_128_CMAC; | |
eb7719ff | 1224 | else if (sm->pairwise != WPA_CIPHER_TKIP) |
6fc6879b JM |
1225 | version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; |
1226 | else | |
1227 | version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; | |
1228 | ||
1229 | pairwise = key_info & WPA_KEY_INFO_KEY_TYPE; | |
1230 | ||
1231 | wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d " | |
1232 | "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d " | |
1233 | "encr=%d)", | |
1234 | version, | |
1235 | (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0, | |
1236 | (key_info & WPA_KEY_INFO_MIC) ? 1 : 0, | |
1237 | (key_info & WPA_KEY_INFO_ACK) ? 1 : 0, | |
1238 | (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0, | |
1239 | pairwise, (unsigned long) kde_len, keyidx, encr); | |
1240 | ||
1241 | key_data_len = kde_len; | |
1242 | ||
1243 | if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || | |
1244 | version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) { | |
1245 | pad_len = key_data_len % 8; | |
1246 | if (pad_len) | |
1247 | pad_len = 8 - pad_len; | |
1248 | key_data_len += pad_len + 8; | |
1249 | } | |
1250 | ||
1251 | len += key_data_len; | |
1252 | ||
1253 | hdr = os_zalloc(len); | |
1254 | if (hdr == NULL) | |
1255 | return; | |
1256 | hdr->version = wpa_auth->conf.eapol_version; | |
1257 | hdr->type = IEEE802_1X_TYPE_EAPOL_KEY; | |
1258 | hdr->length = host_to_be16(len - sizeof(*hdr)); | |
1259 | key = (struct wpa_eapol_key *) (hdr + 1); | |
1260 | ||
1261 | key->type = sm->wpa == WPA_VERSION_WPA2 ? | |
1262 | EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; | |
1263 | key_info |= version; | |
1264 | if (encr && sm->wpa == WPA_VERSION_WPA2) | |
1265 | key_info |= WPA_KEY_INFO_ENCR_KEY_DATA; | |
1266 | if (sm->wpa != WPA_VERSION_WPA2) | |
1267 | key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT; | |
1268 | WPA_PUT_BE16(key->key_info, key_info); | |
1269 | ||
1270 | alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group; | |
c3550295 | 1271 | WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg)); |
6fc6879b JM |
1272 | if (key_info & WPA_KEY_INFO_SMK_MESSAGE) |
1273 | WPA_PUT_BE16(key->key_length, 0); | |
1274 | ||
1275 | /* FIX: STSL: what to use as key_replay_counter? */ | |
22a299ee JM |
1276 | for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) { |
1277 | sm->key_replay[i].valid = sm->key_replay[i - 1].valid; | |
1278 | os_memcpy(sm->key_replay[i].counter, | |
1279 | sm->key_replay[i - 1].counter, | |
1280 | WPA_REPLAY_COUNTER_LEN); | |
1281 | } | |
1282 | inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN); | |
1283 | os_memcpy(key->replay_counter, sm->key_replay[0].counter, | |
6fc6879b | 1284 | WPA_REPLAY_COUNTER_LEN); |
22a299ee | 1285 | sm->key_replay[0].valid = TRUE; |
6fc6879b JM |
1286 | |
1287 | if (nonce) | |
1288 | os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN); | |
1289 | ||
1290 | if (key_rsc) | |
1291 | os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN); | |
1292 | ||
1293 | if (kde && !encr) { | |
1294 | os_memcpy(key + 1, kde, kde_len); | |
1295 | WPA_PUT_BE16(key->key_data_length, kde_len); | |
1296 | } else if (encr && kde) { | |
1297 | buf = os_zalloc(key_data_len); | |
1298 | if (buf == NULL) { | |
1299 | os_free(hdr); | |
1300 | return; | |
1301 | } | |
1302 | pos = buf; | |
1303 | os_memcpy(pos, kde, kde_len); | |
1304 | pos += kde_len; | |
1305 | ||
1306 | if (pad_len) | |
1307 | *pos++ = 0xdd; | |
1308 | ||
1309 | wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data", | |
1310 | buf, key_data_len); | |
1311 | if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || | |
1312 | version == WPA_KEY_INFO_TYPE_AES_128_CMAC) { | |
1313 | if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf, | |
1314 | (u8 *) (key + 1))) { | |
1315 | os_free(hdr); | |
1316 | os_free(buf); | |
1317 | return; | |
1318 | } | |
1319 | WPA_PUT_BE16(key->key_data_length, key_data_len); | |
1320 | } else { | |
1321 | u8 ek[32]; | |
1322 | os_memcpy(key->key_iv, | |
1323 | sm->group->Counter + WPA_NONCE_LEN - 16, 16); | |
1324 | inc_byte_array(sm->group->Counter, WPA_NONCE_LEN); | |
1325 | os_memcpy(ek, key->key_iv, 16); | |
1326 | os_memcpy(ek + 16, sm->PTK.kek, 16); | |
1327 | os_memcpy(key + 1, buf, key_data_len); | |
1328 | rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len); | |
1329 | WPA_PUT_BE16(key->key_data_length, key_data_len); | |
1330 | } | |
1331 | os_free(buf); | |
1332 | } | |
1333 | ||
1334 | if (key_info & WPA_KEY_INFO_MIC) { | |
1335 | if (!sm->PTK_valid) { | |
1336 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
1337 | "PTK not valid when sending EAPOL-Key " | |
1338 | "frame"); | |
1339 | os_free(hdr); | |
1340 | return; | |
1341 | } | |
1342 | wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len, | |
1343 | key->key_mic); | |
1344 | } | |
1345 | ||
1346 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx, | |
1347 | 1); | |
1348 | wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len, | |
1349 | sm->pairwise_set); | |
1350 | os_free(hdr); | |
1351 | } | |
1352 | ||
1353 | ||
1354 | static void wpa_send_eapol(struct wpa_authenticator *wpa_auth, | |
1355 | struct wpa_state_machine *sm, int key_info, | |
1356 | const u8 *key_rsc, const u8 *nonce, | |
1357 | const u8 *kde, size_t kde_len, | |
1358 | int keyidx, int encr) | |
1359 | { | |
1360 | int timeout_ms; | |
1361 | int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE; | |
bae61562 | 1362 | int ctr; |
6fc6879b JM |
1363 | |
1364 | if (sm == NULL) | |
1365 | return; | |
1366 | ||
1367 | __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len, | |
1368 | keyidx, encr, 0); | |
1369 | ||
bae61562 | 1370 | ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr; |
e4bf4db9 | 1371 | if (ctr == 1 && wpa_auth->conf.tx_status) |
00338a4f JM |
1372 | timeout_ms = pairwise ? eapol_key_timeout_first : |
1373 | eapol_key_timeout_first_group; | |
bae61562 JM |
1374 | else |
1375 | timeout_ms = eapol_key_timeout_subseq; | |
e4bf4db9 JM |
1376 | if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC)) |
1377 | sm->pending_1_of_4_timeout = 1; | |
1378 | wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry " | |
1379 | "counter %d)", timeout_ms, ctr); | |
6fc6879b JM |
1380 | eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000, |
1381 | wpa_send_eapol_timeout, wpa_auth, sm); | |
1382 | } | |
1383 | ||
1384 | ||
1385 | static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len) | |
1386 | { | |
1387 | struct ieee802_1x_hdr *hdr; | |
1388 | struct wpa_eapol_key *key; | |
1389 | u16 key_info; | |
1390 | int ret = 0; | |
1391 | u8 mic[16]; | |
1392 | ||
1393 | if (data_len < sizeof(*hdr) + sizeof(*key)) | |
1394 | return -1; | |
1395 | ||
1396 | hdr = (struct ieee802_1x_hdr *) data; | |
1397 | key = (struct wpa_eapol_key *) (hdr + 1); | |
1398 | key_info = WPA_GET_BE16(key->key_info); | |
1399 | os_memcpy(mic, key->key_mic, 16); | |
1400 | os_memset(key->key_mic, 0, 16); | |
1401 | if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK, | |
1402 | data, data_len, key->key_mic) || | |
1403 | os_memcmp(mic, key->key_mic, 16) != 0) | |
1404 | ret = -1; | |
1405 | os_memcpy(key->key_mic, mic, 16); | |
1406 | return ret; | |
1407 | } | |
1408 | ||
1409 | ||
1410 | void wpa_remove_ptk(struct wpa_state_machine *sm) | |
1411 | { | |
1412 | sm->PTK_valid = FALSE; | |
1413 | os_memset(&sm->PTK, 0, sizeof(sm->PTK)); | |
26083221 | 1414 | wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0); |
6fc6879b | 1415 | sm->pairwise_set = FALSE; |
581a8cde | 1416 | eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); |
6fc6879b JM |
1417 | } |
1418 | ||
1419 | ||
6f9b5d16 | 1420 | int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event) |
6fc6879b | 1421 | { |
5d22a1d5 JM |
1422 | int remove_ptk = 1; |
1423 | ||
6fc6879b | 1424 | if (sm == NULL) |
6f9b5d16 | 1425 | return -1; |
6fc6879b JM |
1426 | |
1427 | wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
1428 | "event %d notification", event); | |
1429 | ||
1430 | switch (event) { | |
1431 | case WPA_AUTH: | |
1432 | case WPA_ASSOC: | |
1433 | break; | |
1434 | case WPA_DEAUTH: | |
1435 | case WPA_DISASSOC: | |
1436 | sm->DeauthenticationRequest = TRUE; | |
1437 | break; | |
1438 | case WPA_REAUTH: | |
1439 | case WPA_REAUTH_EAPOL: | |
3ab72b62 JM |
1440 | if (!sm->started) { |
1441 | /* | |
1442 | * When using WPS, we may end up here if the STA | |
1443 | * manages to re-associate without the previous STA | |
1444 | * entry getting removed. Consequently, we need to make | |
1445 | * sure that the WPA state machines gets initialized | |
1446 | * properly at this point. | |
1447 | */ | |
1448 | wpa_printf(MSG_DEBUG, "WPA state machine had not been " | |
1449 | "started - initialize now"); | |
1450 | sm->started = 1; | |
1451 | sm->Init = TRUE; | |
1452 | if (wpa_sm_step(sm) == 1) | |
1453 | return 1; /* should not really happen */ | |
1454 | sm->Init = FALSE; | |
1455 | sm->AuthenticationRequest = TRUE; | |
1456 | break; | |
1457 | } | |
9663596f JM |
1458 | if (sm->GUpdateStationKeys) { |
1459 | /* | |
1460 | * Reauthentication cancels the pending group key | |
1461 | * update for this STA. | |
1462 | */ | |
1463 | sm->group->GKeyDoneStations--; | |
1464 | sm->GUpdateStationKeys = FALSE; | |
1465 | sm->PtkGroupInit = TRUE; | |
1466 | } | |
6fc6879b JM |
1467 | sm->ReAuthenticationRequest = TRUE; |
1468 | break; | |
1469 | case WPA_ASSOC_FT: | |
1470 | #ifdef CONFIG_IEEE80211R | |
81a658d7 JM |
1471 | wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration " |
1472 | "after association"); | |
1473 | wpa_ft_install_ptk(sm); | |
1474 | ||
6fc6879b JM |
1475 | /* Using FT protocol, not WPA auth state machine */ |
1476 | sm->ft_completed = 1; | |
6f9b5d16 | 1477 | return 0; |
6fc6879b JM |
1478 | #else /* CONFIG_IEEE80211R */ |
1479 | break; | |
1480 | #endif /* CONFIG_IEEE80211R */ | |
1481 | } | |
1482 | ||
1483 | #ifdef CONFIG_IEEE80211R | |
1484 | sm->ft_completed = 0; | |
1485 | #endif /* CONFIG_IEEE80211R */ | |
1486 | ||
5d22a1d5 JM |
1487 | #ifdef CONFIG_IEEE80211W |
1488 | if (sm->mgmt_frame_prot && event == WPA_AUTH) | |
1489 | remove_ptk = 0; | |
1490 | #endif /* CONFIG_IEEE80211W */ | |
6fc6879b | 1491 | |
5d22a1d5 JM |
1492 | if (remove_ptk) { |
1493 | sm->PTK_valid = FALSE; | |
1494 | os_memset(&sm->PTK, 0, sizeof(sm->PTK)); | |
1495 | ||
1496 | if (event != WPA_REAUTH_EAPOL) | |
1497 | wpa_remove_ptk(sm); | |
1498 | } | |
6fc6879b | 1499 | |
6f9b5d16 | 1500 | return wpa_sm_step(sm); |
6fc6879b JM |
1501 | } |
1502 | ||
1503 | ||
6fc6879b JM |
1504 | SM_STATE(WPA_PTK, INITIALIZE) |
1505 | { | |
1506 | SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk); | |
1507 | if (sm->Init) { | |
1508 | /* Init flag is not cleared here, so avoid busy | |
1509 | * loop by claiming nothing changed. */ | |
1510 | sm->changed = FALSE; | |
1511 | } | |
1512 | ||
1513 | sm->keycount = 0; | |
1514 | if (sm->GUpdateStationKeys) | |
1515 | sm->group->GKeyDoneStations--; | |
1516 | sm->GUpdateStationKeys = FALSE; | |
1517 | if (sm->wpa == WPA_VERSION_WPA) | |
1518 | sm->PInitAKeys = FALSE; | |
1519 | if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and | |
1520 | * Local AA > Remote AA)) */) { | |
1521 | sm->Pair = TRUE; | |
1522 | } | |
1523 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0); | |
1524 | wpa_remove_ptk(sm); | |
1525 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0); | |
1526 | sm->TimeoutCtr = 0; | |
56586197 | 1527 | if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { |
6fc6879b JM |
1528 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, |
1529 | WPA_EAPOL_authorized, 0); | |
1530 | } | |
1531 | } | |
1532 | ||
1533 | ||
1534 | SM_STATE(WPA_PTK, DISCONNECT) | |
1535 | { | |
1536 | SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk); | |
1537 | sm->Disconnect = FALSE; | |
1538 | wpa_sta_disconnect(sm->wpa_auth, sm->addr); | |
1539 | } | |
1540 | ||
1541 | ||
1542 | SM_STATE(WPA_PTK, DISCONNECTED) | |
1543 | { | |
1544 | SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk); | |
1545 | sm->DeauthenticationRequest = FALSE; | |
1546 | } | |
1547 | ||
1548 | ||
1549 | SM_STATE(WPA_PTK, AUTHENTICATION) | |
1550 | { | |
1551 | SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk); | |
1552 | os_memset(&sm->PTK, 0, sizeof(sm->PTK)); | |
1553 | sm->PTK_valid = FALSE; | |
1554 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto, | |
1555 | 1); | |
1556 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1); | |
1557 | sm->AuthenticationRequest = FALSE; | |
1558 | } | |
1559 | ||
1560 | ||
40d00d2b NC |
1561 | static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth, |
1562 | struct wpa_group *group) | |
1bdb7ab3 | 1563 | { |
40d00d2b NC |
1564 | if (group->first_sta_seen) |
1565 | return; | |
1bdb7ab3 JM |
1566 | /* |
1567 | * System has run bit further than at the time hostapd was started | |
1568 | * potentially very early during boot up. This provides better chances | |
1569 | * of collecting more randomness on embedded systems. Re-initialize the | |
1570 | * GMK and Counter here to improve their strength if there was not | |
1571 | * enough entropy available immediately after system startup. | |
1572 | */ | |
1573 | wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first " | |
1574 | "station"); | |
08704cd8 JM |
1575 | if (random_pool_ready() != 1) { |
1576 | wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " | |
1577 | "to proceed - reject first 4-way handshake"); | |
1578 | group->reject_4way_hs_for_entropy = TRUE; | |
40d00d2b NC |
1579 | } else { |
1580 | group->first_sta_seen = TRUE; | |
1581 | group->reject_4way_hs_for_entropy = FALSE; | |
08704cd8 | 1582 | } |
40d00d2b | 1583 | |
1bdb7ab3 JM |
1584 | wpa_group_init_gmk_and_counter(wpa_auth, group); |
1585 | wpa_gtk_update(wpa_auth, group); | |
1586 | wpa_group_config_group_keys(wpa_auth, group); | |
1587 | } | |
1588 | ||
1589 | ||
6fc6879b JM |
1590 | SM_STATE(WPA_PTK, AUTHENTICATION2) |
1591 | { | |
1592 | SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk); | |
1bdb7ab3 | 1593 | |
40d00d2b | 1594 | wpa_group_ensure_init(sm->wpa_auth, sm->group); |
1bdb7ab3 | 1595 | |
3825a19b JM |
1596 | /* |
1597 | * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat | |
1598 | * ambiguous. The Authenticator state machine uses a counter that is | |
1599 | * incremented by one for each 4-way handshake. However, the security | |
1600 | * analysis of 4-way handshake points out that unpredictable nonces | |
1601 | * help in preventing precomputation attacks. Instead of the state | |
1602 | * machine definition, use an unpredictable nonce value here to provide | |
1603 | * stronger protection against potential precomputation attacks. | |
1604 | */ | |
1605 | if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { | |
1606 | wpa_printf(MSG_ERROR, "WPA: Failed to get random data for " | |
1607 | "ANonce."); | |
1608 | wpa_sta_disconnect(sm->wpa_auth, sm->addr); | |
1609 | return; | |
1610 | } | |
bc8318ac JM |
1611 | wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce, |
1612 | WPA_NONCE_LEN); | |
6fc6879b JM |
1613 | sm->ReAuthenticationRequest = FALSE; |
1614 | /* IEEE 802.11i does not clear TimeoutCtr here, but this is more | |
1615 | * logical place than INITIALIZE since AUTHENTICATION2 can be | |
1616 | * re-entered on ReAuthenticationRequest without going through | |
1617 | * INITIALIZE. */ | |
1618 | sm->TimeoutCtr = 0; | |
1619 | } | |
1620 | ||
1621 | ||
1622 | SM_STATE(WPA_PTK, INITPMK) | |
1623 | { | |
1624 | u8 msk[2 * PMK_LEN]; | |
1625 | size_t len = 2 * PMK_LEN; | |
1626 | ||
1627 | SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk); | |
1628 | #ifdef CONFIG_IEEE80211R | |
1629 | sm->xxkey_len = 0; | |
1630 | #endif /* CONFIG_IEEE80211R */ | |
1631 | if (sm->pmksa) { | |
1632 | wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache"); | |
1633 | os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN); | |
1634 | } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) { | |
1635 | wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine " | |
1636 | "(len=%lu)", (unsigned long) len); | |
1637 | os_memcpy(sm->PMK, msk, PMK_LEN); | |
1638 | #ifdef CONFIG_IEEE80211R | |
1639 | if (len >= 2 * PMK_LEN) { | |
1640 | os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN); | |
1641 | sm->xxkey_len = PMK_LEN; | |
1642 | } | |
1643 | #endif /* CONFIG_IEEE80211R */ | |
1644 | } else { | |
1645 | wpa_printf(MSG_DEBUG, "WPA: Could not get PMK"); | |
1646 | } | |
1647 | ||
1648 | sm->req_replay_counter_used = 0; | |
1649 | /* IEEE 802.11i does not set keyRun to FALSE, but not doing this | |
1650 | * will break reauthentication since EAPOL state machines may not be | |
1651 | * get into AUTHENTICATING state that clears keyRun before WPA state | |
1652 | * machine enters AUTHENTICATION2 state and goes immediately to INITPMK | |
1653 | * state and takes PMK from the previously used AAA Key. This will | |
1654 | * eventually fail in 4-Way Handshake because Supplicant uses PMK | |
1655 | * derived from the new AAA Key. Setting keyRun = FALSE here seems to | |
1656 | * be good workaround for this issue. */ | |
1657 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0); | |
1658 | } | |
1659 | ||
1660 | ||
1661 | SM_STATE(WPA_PTK, INITPSK) | |
1662 | { | |
1663 | const u8 *psk; | |
1664 | SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk); | |
1665 | psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL); | |
1666 | if (psk) { | |
1667 | os_memcpy(sm->PMK, psk, PMK_LEN); | |
1668 | #ifdef CONFIG_IEEE80211R | |
1669 | os_memcpy(sm->xxkey, psk, PMK_LEN); | |
1670 | sm->xxkey_len = PMK_LEN; | |
1671 | #endif /* CONFIG_IEEE80211R */ | |
1672 | } | |
1673 | sm->req_replay_counter_used = 0; | |
1674 | } | |
1675 | ||
1676 | ||
1677 | SM_STATE(WPA_PTK, PTKSTART) | |
1678 | { | |
1679 | u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL; | |
1680 | size_t pmkid_len = 0; | |
1681 | ||
1682 | SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk); | |
1683 | sm->PTKRequest = FALSE; | |
1684 | sm->TimeoutEvt = FALSE; | |
bae61562 JM |
1685 | |
1686 | sm->TimeoutCtr++; | |
1687 | if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { | |
1688 | /* No point in sending the EAPOL-Key - we will disconnect | |
1689 | * immediately following this. */ | |
1690 | return; | |
1691 | } | |
1692 | ||
6fc6879b JM |
1693 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, |
1694 | "sending 1/4 msg of 4-Way Handshake"); | |
1695 | /* | |
1696 | * TODO: Could add PMKID even with WPA2-PSK, but only if there is only | |
1697 | * one possible PSK for this STA. | |
1698 | */ | |
1699 | if (sm->wpa == WPA_VERSION_WPA2 && | |
56586197 | 1700 | wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt)) { |
6fc6879b JM |
1701 | pmkid = buf; |
1702 | pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN; | |
1703 | pmkid[0] = WLAN_EID_VENDOR_SPECIFIC; | |
1704 | pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN; | |
1705 | RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID); | |
1706 | if (sm->pmksa) | |
1707 | os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN], | |
1708 | sm->pmksa->pmkid, PMKID_LEN); | |
1709 | else { | |
1710 | /* | |
1711 | * Calculate PMKID since no PMKSA cache entry was | |
1712 | * available with pre-calculated PMKID. | |
1713 | */ | |
1714 | rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr, | |
56586197 JM |
1715 | sm->addr, &pmkid[2 + RSN_SELECTOR_LEN], |
1716 | wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); | |
6fc6879b JM |
1717 | } |
1718 | } | |
1719 | wpa_send_eapol(sm->wpa_auth, sm, | |
1720 | WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL, | |
1721 | sm->ANonce, pmkid, pmkid_len, 0, 0); | |
6fc6879b JM |
1722 | } |
1723 | ||
1724 | ||
1725 | static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk, | |
1726 | struct wpa_ptk *ptk) | |
1727 | { | |
eb7719ff | 1728 | size_t ptk_len = sm->pairwise != WPA_CIPHER_TKIP ? 48 : 64; |
6fc6879b | 1729 | #ifdef CONFIG_IEEE80211R |
56586197 | 1730 | if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) |
c0a61908 | 1731 | return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len); |
6fc6879b JM |
1732 | #endif /* CONFIG_IEEE80211R */ |
1733 | ||
1734 | wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion", | |
1735 | sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce, | |
c0a61908 | 1736 | (u8 *) ptk, ptk_len, |
56586197 | 1737 | wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); |
6fc6879b JM |
1738 | |
1739 | return 0; | |
1740 | } | |
1741 | ||
1742 | ||
1743 | SM_STATE(WPA_PTK, PTKCALCNEGOTIATING) | |
1744 | { | |
1745 | struct wpa_ptk PTK; | |
1746 | int ok = 0; | |
1747 | const u8 *pmk = NULL; | |
1748 | ||
1749 | SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk); | |
1750 | sm->EAPOLKeyReceived = FALSE; | |
68921e24 | 1751 | sm->update_snonce = FALSE; |
6fc6879b JM |
1752 | |
1753 | /* WPA with IEEE 802.1X: use the derived PMK from EAP | |
1754 | * WPA-PSK: iterate through possible PSKs and select the one matching | |
1755 | * the packet */ | |
1756 | for (;;) { | |
56586197 | 1757 | if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { |
6fc6879b JM |
1758 | pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, pmk); |
1759 | if (pmk == NULL) | |
1760 | break; | |
1761 | } else | |
1762 | pmk = sm->PMK; | |
1763 | ||
1764 | wpa_derive_ptk(sm, pmk, &PTK); | |
1765 | ||
1766 | if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key, | |
1767 | sm->last_rx_eapol_key_len) == 0) { | |
1768 | ok = 1; | |
1769 | break; | |
1770 | } | |
1771 | ||
56586197 | 1772 | if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) |
6fc6879b JM |
1773 | break; |
1774 | } | |
1775 | ||
1776 | if (!ok) { | |
1777 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
1778 | "invalid MIC in msg 2/4 of 4-Way Handshake"); | |
1779 | return; | |
1780 | } | |
1781 | ||
26e23750 JM |
1782 | #ifdef CONFIG_IEEE80211R |
1783 | if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { | |
1784 | /* | |
1785 | * Verify that PMKR1Name from EAPOL-Key message 2/4 matches | |
1786 | * with the value we derived. | |
1787 | */ | |
1788 | if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name, | |
1789 | WPA_PMK_NAME_LEN) != 0) { | |
1790 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
1791 | "PMKR1Name mismatch in FT 4-way " | |
1792 | "handshake"); | |
1793 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from " | |
1794 | "Supplicant", | |
1795 | sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN); | |
1796 | wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", | |
1797 | sm->pmk_r1_name, WPA_PMK_NAME_LEN); | |
1798 | return; | |
1799 | } | |
1800 | } | |
1801 | #endif /* CONFIG_IEEE80211R */ | |
1802 | ||
e4bf4db9 | 1803 | sm->pending_1_of_4_timeout = 0; |
6fc6879b JM |
1804 | eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); |
1805 | ||
56586197 | 1806 | if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { |
6fc6879b JM |
1807 | /* PSK may have changed from the previous choice, so update |
1808 | * state machine data based on whatever PSK was selected here. | |
1809 | */ | |
1810 | os_memcpy(sm->PMK, pmk, PMK_LEN); | |
1811 | } | |
1812 | ||
1813 | sm->MICVerified = TRUE; | |
1814 | ||
1815 | os_memcpy(&sm->PTK, &PTK, sizeof(PTK)); | |
1816 | sm->PTK_valid = TRUE; | |
1817 | } | |
1818 | ||
1819 | ||
1820 | SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2) | |
1821 | { | |
1822 | SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk); | |
1823 | sm->TimeoutCtr = 0; | |
1824 | } | |
1825 | ||
1826 | ||
1827 | #ifdef CONFIG_IEEE80211W | |
1828 | ||
1829 | static int ieee80211w_kde_len(struct wpa_state_machine *sm) | |
1830 | { | |
1831 | if (sm->mgmt_frame_prot) { | |
1832 | return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde); | |
1833 | } | |
1834 | ||
1835 | return 0; | |
1836 | } | |
1837 | ||
1838 | ||
1839 | static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) | |
1840 | { | |
1841 | struct wpa_igtk_kde igtk; | |
1842 | struct wpa_group *gsm = sm->group; | |
1843 | ||
1844 | if (!sm->mgmt_frame_prot) | |
1845 | return pos; | |
1846 | ||
1847 | igtk.keyid[0] = gsm->GN_igtk; | |
1848 | igtk.keyid[1] = 0; | |
7b1080da JM |
1849 | if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE || |
1850 | wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, igtk.pn) < 0) | |
6fc6879b JM |
1851 | os_memset(igtk.pn, 0, sizeof(igtk.pn)); |
1852 | os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); | |
83421850 JM |
1853 | if (sm->wpa_auth->conf.disable_gtk) { |
1854 | /* | |
1855 | * Provide unique random IGTK to each STA to prevent use of | |
1856 | * IGTK in the BSS. | |
1857 | */ | |
1858 | if (random_get_bytes(igtk.igtk, WPA_IGTK_LEN) < 0) | |
1859 | return pos; | |
1860 | } | |
6fc6879b JM |
1861 | pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK, |
1862 | (const u8 *) &igtk, sizeof(igtk), NULL, 0); | |
1863 | ||
1864 | return pos; | |
1865 | } | |
1866 | ||
1867 | #else /* CONFIG_IEEE80211W */ | |
1868 | ||
1869 | static int ieee80211w_kde_len(struct wpa_state_machine *sm) | |
1870 | { | |
1871 | return 0; | |
1872 | } | |
1873 | ||
1874 | ||
1875 | static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) | |
1876 | { | |
1877 | return pos; | |
1878 | } | |
1879 | ||
1880 | #endif /* CONFIG_IEEE80211W */ | |
1881 | ||
1882 | ||
1883 | SM_STATE(WPA_PTK, PTKINITNEGOTIATING) | |
1884 | { | |
83421850 | 1885 | u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32]; |
6fc6879b JM |
1886 | size_t gtk_len, kde_len; |
1887 | struct wpa_group *gsm = sm->group; | |
1888 | u8 *wpa_ie; | |
1889 | int wpa_ie_len, secure, keyidx, encr = 0; | |
1890 | ||
1891 | SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk); | |
1892 | sm->TimeoutEvt = FALSE; | |
bae61562 JM |
1893 | |
1894 | sm->TimeoutCtr++; | |
1895 | if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { | |
1896 | /* No point in sending the EAPOL-Key - we will disconnect | |
1897 | * immediately following this. */ | |
1898 | return; | |
1899 | } | |
1900 | ||
86dfabb8 JM |
1901 | /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE], |
1902 | GTK[GN], IGTK, [FTIE], [TIE * 2]) | |
6fc6879b JM |
1903 | */ |
1904 | os_memset(rsc, 0, WPA_KEY_RSC_LEN); | |
1905 | wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); | |
86dfabb8 | 1906 | /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */ |
6fc6879b JM |
1907 | wpa_ie = sm->wpa_auth->wpa_ie; |
1908 | wpa_ie_len = sm->wpa_auth->wpa_ie_len; | |
1909 | if (sm->wpa == WPA_VERSION_WPA && | |
1910 | (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) && | |
1911 | wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) { | |
1912 | /* WPA-only STA, remove RSN IE */ | |
1913 | wpa_ie = wpa_ie + wpa_ie[1] + 2; | |
1914 | wpa_ie_len = wpa_ie[1] + 2; | |
1915 | } | |
1916 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
1917 | "sending 3/4 msg of 4-Way Handshake"); | |
1918 | if (sm->wpa == WPA_VERSION_WPA2) { | |
1919 | /* WPA2 send GTK in the 4-way handshake */ | |
1920 | secure = 1; | |
1921 | gtk = gsm->GTK[gsm->GN - 1]; | |
1922 | gtk_len = gsm->GTK_len; | |
83421850 JM |
1923 | if (sm->wpa_auth->conf.disable_gtk) { |
1924 | /* | |
1925 | * Provide unique random GTK to each STA to prevent use | |
1926 | * of GTK in the BSS. | |
1927 | */ | |
1928 | if (random_get_bytes(dummy_gtk, gtk_len) < 0) | |
1929 | return; | |
1930 | gtk = dummy_gtk; | |
1931 | } | |
6fc6879b JM |
1932 | keyidx = gsm->GN; |
1933 | _rsc = rsc; | |
1934 | encr = 1; | |
1935 | } else { | |
1936 | /* WPA does not include GTK in msg 3/4 */ | |
1937 | secure = 0; | |
1938 | gtk = NULL; | |
1939 | gtk_len = 0; | |
1940 | keyidx = 0; | |
1941 | _rsc = NULL; | |
0d442aff JM |
1942 | if (sm->rx_eapol_key_secure) { |
1943 | /* | |
1944 | * It looks like Windows 7 supplicant tries to use | |
1945 | * Secure bit in msg 2/4 after having reported Michael | |
1946 | * MIC failure and it then rejects the 4-way handshake | |
1947 | * if msg 3/4 does not set Secure bit. Work around this | |
1948 | * by setting the Secure bit here even in the case of | |
1949 | * WPA if the supplicant used it first. | |
1950 | */ | |
1951 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
4740d5b9 JM |
1952 | "STA used Secure bit in WPA msg 2/4 - " |
1953 | "set Secure for 3/4 as workaround"); | |
0d442aff JM |
1954 | secure = 1; |
1955 | } | |
6fc6879b JM |
1956 | } |
1957 | ||
1958 | kde_len = wpa_ie_len + ieee80211w_kde_len(sm); | |
1959 | if (gtk) | |
1960 | kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len; | |
26e23750 | 1961 | #ifdef CONFIG_IEEE80211R |
86dfabb8 JM |
1962 | if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { |
1963 | kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */ | |
1964 | kde_len += 300; /* FTIE + 2 * TIE */ | |
1965 | } | |
26e23750 | 1966 | #endif /* CONFIG_IEEE80211R */ |
6fc6879b JM |
1967 | kde = os_malloc(kde_len); |
1968 | if (kde == NULL) | |
1969 | return; | |
1970 | ||
1971 | pos = kde; | |
1972 | os_memcpy(pos, wpa_ie, wpa_ie_len); | |
1973 | pos += wpa_ie_len; | |
26e23750 JM |
1974 | #ifdef CONFIG_IEEE80211R |
1975 | if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { | |
1976 | int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name); | |
1977 | if (res < 0) { | |
1978 | wpa_printf(MSG_ERROR, "FT: Failed to insert " | |
1979 | "PMKR1Name into RSN IE in EAPOL-Key data"); | |
1980 | os_free(kde); | |
1981 | return; | |
1982 | } | |
1983 | pos += res; | |
1984 | } | |
1985 | #endif /* CONFIG_IEEE80211R */ | |
6fc6879b JM |
1986 | if (gtk) { |
1987 | u8 hdr[2]; | |
1988 | hdr[0] = keyidx & 0x03; | |
1989 | hdr[1] = 0; | |
1990 | pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, | |
1991 | gtk, gtk_len); | |
1992 | } | |
1993 | pos = ieee80211w_kde_add(sm, pos); | |
1994 | ||
86dfabb8 JM |
1995 | #ifdef CONFIG_IEEE80211R |
1996 | if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { | |
1997 | int res; | |
1998 | struct wpa_auth_config *conf; | |
1999 | ||
2000 | conf = &sm->wpa_auth->conf; | |
2001 | res = wpa_write_ftie(conf, conf->r0_key_holder, | |
2002 | conf->r0_key_holder_len, | |
2003 | NULL, NULL, pos, kde + kde_len - pos, | |
2004 | NULL, 0); | |
2005 | if (res < 0) { | |
2006 | wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE " | |
2007 | "into EAPOL-Key Key Data"); | |
2008 | os_free(kde); | |
2009 | return; | |
2010 | } | |
2011 | pos += res; | |
2012 | ||
2013 | /* TIE[ReassociationDeadline] (TU) */ | |
2014 | *pos++ = WLAN_EID_TIMEOUT_INTERVAL; | |
2015 | *pos++ = 5; | |
2016 | *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE; | |
2017 | WPA_PUT_LE32(pos, conf->reassociation_deadline); | |
2018 | pos += 4; | |
2019 | ||
2020 | /* TIE[KeyLifetime] (seconds) */ | |
2021 | *pos++ = WLAN_EID_TIMEOUT_INTERVAL; | |
2022 | *pos++ = 5; | |
2023 | *pos++ = WLAN_TIMEOUT_KEY_LIFETIME; | |
2024 | WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60); | |
2025 | pos += 4; | |
2026 | } | |
2027 | #endif /* CONFIG_IEEE80211R */ | |
2028 | ||
6fc6879b JM |
2029 | wpa_send_eapol(sm->wpa_auth, sm, |
2030 | (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC | | |
2031 | WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL | | |
2032 | WPA_KEY_INFO_KEY_TYPE, | |
2033 | _rsc, sm->ANonce, kde, pos - kde, keyidx, encr); | |
2034 | os_free(kde); | |
6fc6879b JM |
2035 | } |
2036 | ||
2037 | ||
2038 | SM_STATE(WPA_PTK, PTKINITDONE) | |
2039 | { | |
2040 | SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk); | |
2041 | sm->EAPOLKeyReceived = FALSE; | |
2042 | if (sm->Pair) { | |
c3550295 JM |
2043 | enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise); |
2044 | int klen = wpa_cipher_key_len(sm->pairwise); | |
6fc6879b JM |
2045 | if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, |
2046 | sm->PTK.tk1, klen)) { | |
2047 | wpa_sta_disconnect(sm->wpa_auth, sm->addr); | |
2048 | return; | |
2049 | } | |
2050 | /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ | |
2051 | sm->pairwise_set = TRUE; | |
2052 | ||
581a8cde JM |
2053 | if (sm->wpa_auth->conf.wpa_ptk_rekey) { |
2054 | eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); | |
2055 | eloop_register_timeout(sm->wpa_auth->conf. | |
2056 | wpa_ptk_rekey, 0, wpa_rekey_ptk, | |
2057 | sm->wpa_auth, sm); | |
2058 | } | |
2059 | ||
56586197 | 2060 | if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { |
6fc6879b JM |
2061 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, |
2062 | WPA_EAPOL_authorized, 1); | |
2063 | } | |
2064 | } | |
2065 | ||
2066 | if (0 /* IBSS == TRUE */) { | |
2067 | sm->keycount++; | |
2068 | if (sm->keycount == 2) { | |
2069 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, | |
2070 | WPA_EAPOL_portValid, 1); | |
2071 | } | |
2072 | } else { | |
2073 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, | |
2074 | 1); | |
2075 | } | |
2076 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0); | |
2077 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1); | |
2078 | if (sm->wpa == WPA_VERSION_WPA) | |
2079 | sm->PInitAKeys = TRUE; | |
2080 | else | |
2081 | sm->has_GTK = TRUE; | |
2082 | wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, | |
2083 | "pairwise key handshake completed (%s)", | |
2084 | sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); | |
2085 | ||
2086 | #ifdef CONFIG_IEEE80211R | |
2087 | wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr); | |
2088 | #endif /* CONFIG_IEEE80211R */ | |
2089 | } | |
2090 | ||
2091 | ||
2092 | SM_STEP(WPA_PTK) | |
2093 | { | |
2094 | struct wpa_authenticator *wpa_auth = sm->wpa_auth; | |
2095 | ||
2096 | if (sm->Init) | |
2097 | SM_ENTER(WPA_PTK, INITIALIZE); | |
2098 | else if (sm->Disconnect | |
1aae01fc BG |
2099 | /* || FIX: dot11RSNAConfigSALifetime timeout */) { |
2100 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
2101 | "WPA_PTK: sm->Disconnect"); | |
6fc6879b | 2102 | SM_ENTER(WPA_PTK, DISCONNECT); |
1aae01fc | 2103 | } |
6fc6879b JM |
2104 | else if (sm->DeauthenticationRequest) |
2105 | SM_ENTER(WPA_PTK, DISCONNECTED); | |
2106 | else if (sm->AuthenticationRequest) | |
2107 | SM_ENTER(WPA_PTK, AUTHENTICATION); | |
2108 | else if (sm->ReAuthenticationRequest) | |
2109 | SM_ENTER(WPA_PTK, AUTHENTICATION2); | |
2110 | else if (sm->PTKRequest) | |
2111 | SM_ENTER(WPA_PTK, PTKSTART); | |
2112 | else switch (sm->wpa_ptk_state) { | |
2113 | case WPA_PTK_INITIALIZE: | |
2114 | break; | |
2115 | case WPA_PTK_DISCONNECT: | |
2116 | SM_ENTER(WPA_PTK, DISCONNECTED); | |
2117 | break; | |
2118 | case WPA_PTK_DISCONNECTED: | |
2119 | SM_ENTER(WPA_PTK, INITIALIZE); | |
2120 | break; | |
2121 | case WPA_PTK_AUTHENTICATION: | |
2122 | SM_ENTER(WPA_PTK, AUTHENTICATION2); | |
2123 | break; | |
2124 | case WPA_PTK_AUTHENTICATION2: | |
56586197 | 2125 | if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && |
6fc6879b JM |
2126 | wpa_auth_get_eapol(sm->wpa_auth, sm->addr, |
2127 | WPA_EAPOL_keyRun) > 0) | |
2128 | SM_ENTER(WPA_PTK, INITPMK); | |
56586197 | 2129 | else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) |
6fc6879b JM |
2130 | /* FIX: && 802.1X::keyRun */) |
2131 | SM_ENTER(WPA_PTK, INITPSK); | |
2132 | break; | |
2133 | case WPA_PTK_INITPMK: | |
2134 | if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr, | |
2135 | WPA_EAPOL_keyAvailable) > 0) | |
2136 | SM_ENTER(WPA_PTK, PTKSTART); | |
2137 | else { | |
2138 | wpa_auth->dot11RSNA4WayHandshakeFailures++; | |
1aae01fc BG |
2139 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, |
2140 | "INITPMK - keyAvailable = false"); | |
6fc6879b JM |
2141 | SM_ENTER(WPA_PTK, DISCONNECT); |
2142 | } | |
2143 | break; | |
2144 | case WPA_PTK_INITPSK: | |
2145 | if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL)) | |
2146 | SM_ENTER(WPA_PTK, PTKSTART); | |
2147 | else { | |
2148 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, | |
2149 | "no PSK configured for the STA"); | |
2150 | wpa_auth->dot11RSNA4WayHandshakeFailures++; | |
2151 | SM_ENTER(WPA_PTK, DISCONNECT); | |
2152 | } | |
2153 | break; | |
2154 | case WPA_PTK_PTKSTART: | |
2155 | if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && | |
2156 | sm->EAPOLKeyPairwise) | |
2157 | SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); | |
2158 | else if (sm->TimeoutCtr > | |
2159 | (int) dot11RSNAConfigPairwiseUpdateCount) { | |
2160 | wpa_auth->dot11RSNA4WayHandshakeFailures++; | |
1aae01fc BG |
2161 | wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, |
2162 | "PTKSTART: Retry limit %d reached", | |
2163 | dot11RSNAConfigPairwiseUpdateCount); | |
6fc6879b JM |
2164 | SM_ENTER(WPA_PTK, DISCONNECT); |
2165 | } else if (sm->TimeoutEvt) | |
2166 | SM_ENTER(WPA_PTK, PTKSTART); | |
2167 | break; | |
2168 | case WPA_PTK_PTKCALCNEGOTIATING: | |
2169 | if (sm->MICVerified) | |
2170 | SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2); | |
2171 | else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && | |
2172 | sm->EAPOLKeyPairwise) | |
2173 | SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); | |
2174 | else if (sm->TimeoutEvt) | |
2175 | SM_ENTER(WPA_PTK, PTKSTART); | |
2176 | break; | |
2177 | case WPA_PTK_PTKCALCNEGOTIATING2: | |
2178 | SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); | |
2179 | break; | |
2180 | case WPA_PTK_PTKINITNEGOTIATING: | |
68921e24 JM |
2181 | if (sm->update_snonce) |
2182 | SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); | |
2183 | else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && | |
2184 | sm->EAPOLKeyPairwise && sm->MICVerified) | |
6fc6879b JM |
2185 | SM_ENTER(WPA_PTK, PTKINITDONE); |
2186 | else if (sm->TimeoutCtr > | |
2187 | (int) dot11RSNAConfigPairwiseUpdateCount) { | |
2188 | wpa_auth->dot11RSNA4WayHandshakeFailures++; | |
1aae01fc BG |
2189 | wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, |
2190 | "PTKINITNEGOTIATING: Retry limit %d " | |
2191 | "reached", | |
2192 | dot11RSNAConfigPairwiseUpdateCount); | |
6fc6879b JM |
2193 | SM_ENTER(WPA_PTK, DISCONNECT); |
2194 | } else if (sm->TimeoutEvt) | |
2195 | SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); | |
2196 | break; | |
2197 | case WPA_PTK_PTKINITDONE: | |
2198 | break; | |
2199 | } | |
2200 | } | |
2201 | ||
2202 | ||
2203 | SM_STATE(WPA_PTK_GROUP, IDLE) | |
2204 | { | |
2205 | SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group); | |
2206 | if (sm->Init) { | |
2207 | /* Init flag is not cleared here, so avoid busy | |
2208 | * loop by claiming nothing changed. */ | |
2209 | sm->changed = FALSE; | |
2210 | } | |
2211 | sm->GTimeoutCtr = 0; | |
2212 | } | |
2213 | ||
2214 | ||
2215 | SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING) | |
2216 | { | |
2217 | u8 rsc[WPA_KEY_RSC_LEN]; | |
2218 | struct wpa_group *gsm = sm->group; | |
2219 | u8 *kde, *pos, hdr[2]; | |
2220 | size_t kde_len; | |
83421850 | 2221 | u8 *gtk, dummy_gtk[32]; |
6fc6879b JM |
2222 | |
2223 | SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group); | |
bae61562 JM |
2224 | |
2225 | sm->GTimeoutCtr++; | |
2226 | if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) { | |
2227 | /* No point in sending the EAPOL-Key - we will disconnect | |
2228 | * immediately following this. */ | |
2229 | return; | |
2230 | } | |
2231 | ||
6fc6879b JM |
2232 | if (sm->wpa == WPA_VERSION_WPA) |
2233 | sm->PInitAKeys = FALSE; | |
2234 | sm->TimeoutEvt = FALSE; | |
2235 | /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */ | |
2236 | os_memset(rsc, 0, WPA_KEY_RSC_LEN); | |
2237 | if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE) | |
2238 | wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); | |
2239 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
2240 | "sending 1/2 msg of Group Key Handshake"); | |
2241 | ||
83421850 JM |
2242 | gtk = gsm->GTK[gsm->GN - 1]; |
2243 | if (sm->wpa_auth->conf.disable_gtk) { | |
2244 | /* | |
2245 | * Provide unique random GTK to each STA to prevent use | |
2246 | * of GTK in the BSS. | |
2247 | */ | |
2248 | if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0) | |
2249 | return; | |
2250 | gtk = dummy_gtk; | |
2251 | } | |
6fc6879b JM |
2252 | if (sm->wpa == WPA_VERSION_WPA2) { |
2253 | kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len + | |
2254 | ieee80211w_kde_len(sm); | |
2255 | kde = os_malloc(kde_len); | |
2256 | if (kde == NULL) | |
2257 | return; | |
2258 | ||
2259 | pos = kde; | |
2260 | hdr[0] = gsm->GN & 0x03; | |
2261 | hdr[1] = 0; | |
2262 | pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, | |
83421850 | 2263 | gtk, gsm->GTK_len); |
6fc6879b JM |
2264 | pos = ieee80211w_kde_add(sm, pos); |
2265 | } else { | |
83421850 | 2266 | kde = gtk; |
6fc6879b JM |
2267 | pos = kde + gsm->GTK_len; |
2268 | } | |
2269 | ||
2270 | wpa_send_eapol(sm->wpa_auth, sm, | |
2271 | WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC | | |
2272 | WPA_KEY_INFO_ACK | | |
2273 | (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0), | |
2274 | rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1); | |
2275 | if (sm->wpa == WPA_VERSION_WPA2) | |
2276 | os_free(kde); | |
6fc6879b JM |
2277 | } |
2278 | ||
2279 | ||
2280 | SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED) | |
2281 | { | |
2282 | SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group); | |
2283 | sm->EAPOLKeyReceived = FALSE; | |
2284 | if (sm->GUpdateStationKeys) | |
2285 | sm->group->GKeyDoneStations--; | |
2286 | sm->GUpdateStationKeys = FALSE; | |
2287 | sm->GTimeoutCtr = 0; | |
2288 | /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */ | |
2289 | wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, | |
2290 | "group key handshake completed (%s)", | |
2291 | sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); | |
2292 | sm->has_GTK = TRUE; | |
2293 | } | |
2294 | ||
2295 | ||
2296 | SM_STATE(WPA_PTK_GROUP, KEYERROR) | |
2297 | { | |
2298 | SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group); | |
2299 | if (sm->GUpdateStationKeys) | |
2300 | sm->group->GKeyDoneStations--; | |
2301 | sm->GUpdateStationKeys = FALSE; | |
2302 | sm->Disconnect = TRUE; | |
2303 | } | |
2304 | ||
2305 | ||
2306 | SM_STEP(WPA_PTK_GROUP) | |
2307 | { | |
9663596f | 2308 | if (sm->Init || sm->PtkGroupInit) { |
6fc6879b | 2309 | SM_ENTER(WPA_PTK_GROUP, IDLE); |
9663596f JM |
2310 | sm->PtkGroupInit = FALSE; |
2311 | } else switch (sm->wpa_ptk_group_state) { | |
6fc6879b JM |
2312 | case WPA_PTK_GROUP_IDLE: |
2313 | if (sm->GUpdateStationKeys || | |
2314 | (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys)) | |
2315 | SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); | |
2316 | break; | |
2317 | case WPA_PTK_GROUP_REKEYNEGOTIATING: | |
2318 | if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && | |
2319 | !sm->EAPOLKeyPairwise && sm->MICVerified) | |
2320 | SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED); | |
2321 | else if (sm->GTimeoutCtr > | |
2322 | (int) dot11RSNAConfigGroupUpdateCount) | |
2323 | SM_ENTER(WPA_PTK_GROUP, KEYERROR); | |
2324 | else if (sm->TimeoutEvt) | |
2325 | SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); | |
2326 | break; | |
2327 | case WPA_PTK_GROUP_KEYERROR: | |
2328 | SM_ENTER(WPA_PTK_GROUP, IDLE); | |
2329 | break; | |
2330 | case WPA_PTK_GROUP_REKEYESTABLISHED: | |
2331 | SM_ENTER(WPA_PTK_GROUP, IDLE); | |
2332 | break; | |
2333 | } | |
2334 | } | |
2335 | ||
2336 | ||
2337 | static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, | |
2338 | struct wpa_group *group) | |
2339 | { | |
2340 | int ret = 0; | |
2341 | ||
6fc6879b JM |
2342 | os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); |
2343 | inc_byte_array(group->Counter, WPA_NONCE_LEN); | |
3c7302c2 JM |
2344 | if (wpa_gmk_to_gtk(group->GMK, "Group key expansion", |
2345 | wpa_auth->addr, group->GNonce, | |
2346 | group->GTK[group->GN - 1], group->GTK_len) < 0) | |
2347 | ret = -1; | |
5cb9d5c3 JM |
2348 | wpa_hexdump_key(MSG_DEBUG, "GTK", |
2349 | group->GTK[group->GN - 1], group->GTK_len); | |
6fc6879b JM |
2350 | |
2351 | #ifdef CONFIG_IEEE80211W | |
70f8cc8e | 2352 | if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { |
5cb9d5c3 JM |
2353 | os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); |
2354 | inc_byte_array(group->Counter, WPA_NONCE_LEN); | |
3c7302c2 JM |
2355 | if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion", |
2356 | wpa_auth->addr, group->GNonce, | |
2357 | group->IGTK[group->GN_igtk - 4], | |
2358 | WPA_IGTK_LEN) < 0) | |
2359 | ret = -1; | |
6fc6879b JM |
2360 | wpa_hexdump_key(MSG_DEBUG, "IGTK", |
2361 | group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN); | |
2362 | } | |
2363 | #endif /* CONFIG_IEEE80211W */ | |
2364 | ||
2365 | return ret; | |
2366 | } | |
2367 | ||
2368 | ||
2369 | static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth, | |
2370 | struct wpa_group *group) | |
2371 | { | |
2372 | wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " | |
2373 | "GTK_INIT (VLAN-ID %d)", group->vlan_id); | |
2374 | group->changed = FALSE; /* GInit is not cleared here; avoid loop */ | |
2375 | group->wpa_group_state = WPA_GROUP_GTK_INIT; | |
2376 | ||
2377 | /* GTK[0..N] = 0 */ | |
2378 | os_memset(group->GTK, 0, sizeof(group->GTK)); | |
2379 | group->GN = 1; | |
2380 | group->GM = 2; | |
2381 | #ifdef CONFIG_IEEE80211W | |
2382 | group->GN_igtk = 4; | |
2383 | group->GM_igtk = 5; | |
2384 | #endif /* CONFIG_IEEE80211W */ | |
2385 | /* GTK[GN] = CalcGTK() */ | |
2386 | wpa_gtk_update(wpa_auth, group); | |
2387 | } | |
2388 | ||
2389 | ||
2390 | static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx) | |
2391 | { | |
473b6f22 MB |
2392 | if (ctx != NULL && ctx != sm->group) |
2393 | return 0; | |
2394 | ||
6fc6879b JM |
2395 | if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) { |
2396 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
2397 | "Not in PTKINITDONE; skip Group Key update"); | |
3c183894 | 2398 | sm->GUpdateStationKeys = FALSE; |
6fc6879b JM |
2399 | return 0; |
2400 | } | |
9663596f JM |
2401 | if (sm->GUpdateStationKeys) { |
2402 | /* | |
3c183894 JM |
2403 | * This should not really happen, so add a debug log entry. |
2404 | * Since we clear the GKeyDoneStations before the loop, the | |
2405 | * station needs to be counted here anyway. | |
9663596f JM |
2406 | */ |
2407 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
3c183894 JM |
2408 | "GUpdateStationKeys was already set when " |
2409 | "marking station for GTK rekeying"); | |
9663596f | 2410 | } |
3c183894 | 2411 | |
d32d94db XC |
2412 | #ifdef CONFIG_IEEE80211V |
2413 | /* Do not rekey GTK/IGTK when STA is in wnmsleep */ | |
2414 | if (sm->is_wnmsleep) | |
2415 | return 0; | |
2416 | #endif /* CONFIG_IEEE80211V */ | |
2417 | ||
3c183894 JM |
2418 | sm->group->GKeyDoneStations++; |
2419 | sm->GUpdateStationKeys = TRUE; | |
2420 | ||
6fc6879b JM |
2421 | wpa_sm_step(sm); |
2422 | return 0; | |
2423 | } | |
2424 | ||
2425 | ||
d32d94db XC |
2426 | #ifdef CONFIG_IEEE80211V |
2427 | /* update GTK when exiting wnmsleep mode */ | |
2428 | void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm) | |
2429 | { | |
2430 | if (sm->is_wnmsleep) | |
2431 | return; | |
2432 | ||
2433 | wpa_group_update_sta(sm, NULL); | |
2434 | } | |
2435 | ||
2436 | ||
2437 | void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag) | |
2438 | { | |
2439 | sm->is_wnmsleep = !!flag; | |
2440 | } | |
2441 | ||
2442 | ||
2443 | int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos) | |
2444 | { | |
2445 | u8 *subelem; | |
2446 | struct wpa_group *gsm = sm->group; | |
2447 | size_t subelem_len, pad_len; | |
2448 | const u8 *key; | |
2449 | size_t key_len; | |
2450 | u8 keybuf[32]; | |
2451 | ||
2452 | /* GTK subslement */ | |
2453 | key_len = gsm->GTK_len; | |
2454 | if (key_len > sizeof(keybuf)) | |
2455 | return 0; | |
2456 | ||
2457 | /* | |
2458 | * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less | |
2459 | * than 16 bytes. | |
2460 | */ | |
2461 | pad_len = key_len % 8; | |
2462 | if (pad_len) | |
2463 | pad_len = 8 - pad_len; | |
2464 | if (key_len + pad_len < 16) | |
2465 | pad_len += 8; | |
2466 | if (pad_len) { | |
2467 | os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len); | |
2468 | os_memset(keybuf + key_len, 0, pad_len); | |
2469 | keybuf[key_len] = 0xdd; | |
2470 | key_len += pad_len; | |
2471 | key = keybuf; | |
2472 | } else | |
2473 | key = gsm->GTK[gsm->GN - 1]; | |
2474 | ||
2475 | /* | |
2476 | * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | | |
2477 | * Key[5..32] | 8 padding. | |
2478 | */ | |
2479 | subelem_len = 13 + key_len + 8; | |
2480 | subelem = os_zalloc(subelem_len); | |
2481 | if (subelem == NULL) | |
2482 | return 0; | |
2483 | ||
2484 | subelem[0] = WNM_SLEEP_SUBELEM_GTK; | |
2485 | subelem[1] = 11 + key_len + 8; | |
2486 | /* Key ID in B0-B1 of Key Info */ | |
2487 | WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03); | |
2488 | subelem[4] = gsm->GTK_len; | |
2489 | if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5) != 0) | |
2490 | { | |
2491 | os_free(subelem); | |
2492 | return 0; | |
2493 | } | |
2494 | if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) { | |
2495 | os_free(subelem); | |
2496 | return 0; | |
2497 | } | |
2498 | ||
2499 | os_memcpy(pos, subelem, subelem_len); | |
2500 | ||
2501 | wpa_hexdump_key(MSG_DEBUG, "Plaintext GTK", | |
2502 | gsm->GTK[gsm->GN - 1], gsm->GTK_len); | |
2503 | os_free(subelem); | |
2504 | ||
2505 | return subelem_len; | |
2506 | } | |
2507 | ||
2508 | ||
2509 | #ifdef CONFIG_IEEE80211W | |
2510 | int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos) | |
2511 | { | |
2512 | u8 *subelem, *ptr; | |
2513 | struct wpa_group *gsm = sm->group; | |
2514 | size_t subelem_len; | |
2515 | ||
2516 | /* IGTK subelement | |
2517 | * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | | |
2518 | * Key[16] | 8 padding */ | |
2519 | subelem_len = 1 + 1 + 2 + 6 + WPA_IGTK_LEN + 8; | |
2520 | subelem = os_zalloc(subelem_len); | |
2521 | if (subelem == NULL) | |
2522 | return 0; | |
2523 | ||
2524 | ptr = subelem; | |
2525 | *ptr++ = WNM_SLEEP_SUBELEM_IGTK; | |
2526 | *ptr++ = subelem_len - 2; | |
2527 | WPA_PUT_LE16(ptr, gsm->GN_igtk); | |
2528 | ptr += 2; | |
2529 | if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, ptr) != 0) { | |
2530 | os_free(subelem); | |
2531 | return 0; | |
2532 | } | |
2533 | ptr += 6; | |
2534 | if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8, | |
2535 | gsm->IGTK[gsm->GN_igtk - 4], ptr)) { | |
2536 | os_free(subelem); | |
2537 | return -1; | |
2538 | } | |
2539 | ||
2540 | os_memcpy(pos, subelem, subelem_len); | |
2541 | ||
2542 | wpa_hexdump_key(MSG_DEBUG, "Plaintext IGTK", | |
2543 | gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); | |
2544 | os_free(subelem); | |
2545 | ||
2546 | return subelem_len; | |
2547 | } | |
2548 | #endif /* CONFIG_IEEE80211W */ | |
2549 | #endif /* CONFIG_IEEE80211V */ | |
2550 | ||
2551 | ||
6fc6879b JM |
2552 | static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth, |
2553 | struct wpa_group *group) | |
2554 | { | |
2555 | int tmp; | |
2556 | ||
2557 | wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " | |
2558 | "SETKEYS (VLAN-ID %d)", group->vlan_id); | |
2559 | group->changed = TRUE; | |
2560 | group->wpa_group_state = WPA_GROUP_SETKEYS; | |
2561 | group->GTKReKey = FALSE; | |
2562 | tmp = group->GM; | |
2563 | group->GM = group->GN; | |
2564 | group->GN = tmp; | |
2565 | #ifdef CONFIG_IEEE80211W | |
2566 | tmp = group->GM_igtk; | |
2567 | group->GM_igtk = group->GN_igtk; | |
2568 | group->GN_igtk = tmp; | |
2569 | #endif /* CONFIG_IEEE80211W */ | |
2570 | /* "GKeyDoneStations = GNoStations" is done in more robust way by | |
2571 | * counting the STAs that are marked with GUpdateStationKeys instead of | |
2572 | * including all STAs that could be in not-yet-completed state. */ | |
2573 | wpa_gtk_update(wpa_auth, group); | |
2574 | ||
3c183894 JM |
2575 | if (group->GKeyDoneStations) { |
2576 | wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected " | |
2577 | "GKeyDoneStations=%d when starting new GTK rekey", | |
2578 | group->GKeyDoneStations); | |
2579 | group->GKeyDoneStations = 0; | |
2580 | } | |
473b6f22 | 2581 | wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group); |
6fc6879b JM |
2582 | wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d", |
2583 | group->GKeyDoneStations); | |
2584 | } | |
2585 | ||
2586 | ||
1bdb7ab3 JM |
2587 | static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, |
2588 | struct wpa_group *group) | |
6fc6879b | 2589 | { |
3c7302c2 JM |
2590 | int ret = 0; |
2591 | ||
3c7302c2 | 2592 | if (wpa_auth_set_key(wpa_auth, group->vlan_id, |
c3550295 | 2593 | wpa_cipher_to_alg(wpa_auth->conf.wpa_group), |
0382097e JM |
2594 | broadcast_ether_addr, group->GN, |
2595 | group->GTK[group->GN - 1], group->GTK_len) < 0) | |
3c7302c2 | 2596 | ret = -1; |
6fc6879b JM |
2597 | |
2598 | #ifdef CONFIG_IEEE80211W | |
3c7302c2 JM |
2599 | if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION && |
2600 | wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK, | |
0382097e | 2601 | broadcast_ether_addr, group->GN_igtk, |
3c7302c2 JM |
2602 | group->IGTK[group->GN_igtk - 4], |
2603 | WPA_IGTK_LEN) < 0) | |
2604 | ret = -1; | |
6fc6879b | 2605 | #endif /* CONFIG_IEEE80211W */ |
3c7302c2 JM |
2606 | |
2607 | return ret; | |
6fc6879b JM |
2608 | } |
2609 | ||
2610 | ||
1bdb7ab3 JM |
2611 | static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth, |
2612 | struct wpa_group *group) | |
2613 | { | |
2614 | wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " | |
2615 | "SETKEYSDONE (VLAN-ID %d)", group->vlan_id); | |
2616 | group->changed = TRUE; | |
2617 | group->wpa_group_state = WPA_GROUP_SETKEYSDONE; | |
2618 | ||
2619 | if (wpa_group_config_group_keys(wpa_auth, group) < 0) | |
2620 | return -1; | |
2621 | ||
2622 | return 0; | |
2623 | } | |
2624 | ||
2625 | ||
6fc6879b JM |
2626 | static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, |
2627 | struct wpa_group *group) | |
2628 | { | |
2629 | if (group->GInit) { | |
2630 | wpa_group_gtk_init(wpa_auth, group); | |
2631 | } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT && | |
2632 | group->GTKAuthenticator) { | |
2633 | wpa_group_setkeysdone(wpa_auth, group); | |
2634 | } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE && | |
2635 | group->GTKReKey) { | |
2636 | wpa_group_setkeys(wpa_auth, group); | |
2637 | } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) { | |
2638 | if (group->GKeyDoneStations == 0) | |
2639 | wpa_group_setkeysdone(wpa_auth, group); | |
2640 | else if (group->GTKReKey) | |
2641 | wpa_group_setkeys(wpa_auth, group); | |
2642 | } | |
2643 | } | |
2644 | ||
2645 | ||
e4a6ea1d | 2646 | static int wpa_sm_step(struct wpa_state_machine *sm) |
6fc6879b JM |
2647 | { |
2648 | if (sm == NULL) | |
e4a6ea1d | 2649 | return 0; |
6fc6879b JM |
2650 | |
2651 | if (sm->in_step_loop) { | |
2652 | /* This should not happen, but if it does, make sure we do not | |
2653 | * end up freeing the state machine too early by exiting the | |
2654 | * recursive call. */ | |
2655 | wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively"); | |
e4a6ea1d | 2656 | return 0; |
6fc6879b JM |
2657 | } |
2658 | ||
2659 | sm->in_step_loop = 1; | |
2660 | do { | |
2661 | if (sm->pending_deinit) | |
2662 | break; | |
2663 | ||
2664 | sm->changed = FALSE; | |
2665 | sm->wpa_auth->group->changed = FALSE; | |
2666 | ||
2667 | SM_STEP_RUN(WPA_PTK); | |
2668 | if (sm->pending_deinit) | |
2669 | break; | |
2670 | SM_STEP_RUN(WPA_PTK_GROUP); | |
2671 | if (sm->pending_deinit) | |
2672 | break; | |
2673 | wpa_group_sm_step(sm->wpa_auth, sm->group); | |
2674 | } while (sm->changed || sm->wpa_auth->group->changed); | |
2675 | sm->in_step_loop = 0; | |
2676 | ||
2677 | if (sm->pending_deinit) { | |
2678 | wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state " | |
2679 | "machine deinit for " MACSTR, MAC2STR(sm->addr)); | |
2680 | wpa_free_sta_sm(sm); | |
e4a6ea1d | 2681 | return 1; |
6fc6879b | 2682 | } |
e4a6ea1d | 2683 | return 0; |
6fc6879b JM |
2684 | } |
2685 | ||
2686 | ||
2687 | static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx) | |
2688 | { | |
2689 | struct wpa_state_machine *sm = eloop_ctx; | |
2690 | wpa_sm_step(sm); | |
2691 | } | |
2692 | ||
2693 | ||
2694 | void wpa_auth_sm_notify(struct wpa_state_machine *sm) | |
2695 | { | |
2696 | if (sm == NULL) | |
2697 | return; | |
2698 | eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL); | |
2699 | } | |
2700 | ||
2701 | ||
2702 | void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth) | |
2703 | { | |
2704 | int tmp, i; | |
2705 | struct wpa_group *group; | |
2706 | ||
2707 | if (wpa_auth == NULL) | |
2708 | return; | |
2709 | ||
2710 | group = wpa_auth->group; | |
2711 | ||
2712 | for (i = 0; i < 2; i++) { | |
2713 | tmp = group->GM; | |
2714 | group->GM = group->GN; | |
2715 | group->GN = tmp; | |
2716 | #ifdef CONFIG_IEEE80211W | |
2717 | tmp = group->GM_igtk; | |
2718 | group->GM_igtk = group->GN_igtk; | |
2719 | group->GN_igtk = tmp; | |
2720 | #endif /* CONFIG_IEEE80211W */ | |
2721 | wpa_gtk_update(wpa_auth, group); | |
9354e594 | 2722 | wpa_group_config_group_keys(wpa_auth, group); |
6fc6879b JM |
2723 | } |
2724 | } | |
2725 | ||
2726 | ||
2727 | static const char * wpa_bool_txt(int bool) | |
2728 | { | |
2729 | return bool ? "TRUE" : "FALSE"; | |
2730 | } | |
2731 | ||
2732 | ||
6fc6879b JM |
2733 | #define RSN_SUITE "%02x-%02x-%02x-%d" |
2734 | #define RSN_SUITE_ARG(s) \ | |
2735 | ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff | |
2736 | ||
2737 | int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen) | |
2738 | { | |
2739 | int len = 0, ret; | |
2740 | char pmkid_txt[PMKID_LEN * 2 + 1]; | |
8ce58ceb IH |
2741 | #ifdef CONFIG_RSN_PREAUTH |
2742 | const int preauth = 1; | |
2743 | #else /* CONFIG_RSN_PREAUTH */ | |
2744 | const int preauth = 0; | |
2745 | #endif /* CONFIG_RSN_PREAUTH */ | |
6fc6879b JM |
2746 | |
2747 | if (wpa_auth == NULL) | |
2748 | return len; | |
2749 | ||
2750 | ret = os_snprintf(buf + len, buflen - len, | |
2751 | "dot11RSNAOptionImplemented=TRUE\n" | |
8ce58ceb | 2752 | "dot11RSNAPreauthenticationImplemented=%s\n" |
6fc6879b JM |
2753 | "dot11RSNAEnabled=%s\n" |
2754 | "dot11RSNAPreauthenticationEnabled=%s\n", | |
8ce58ceb | 2755 | wpa_bool_txt(preauth), |
6fc6879b JM |
2756 | wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN), |
2757 | wpa_bool_txt(wpa_auth->conf.rsn_preauth)); | |
2758 | if (ret < 0 || (size_t) ret >= buflen - len) | |
2759 | return len; | |
2760 | len += ret; | |
2761 | ||
2762 | wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), | |
2763 | wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN); | |
2764 | ||
2765 | ret = os_snprintf( | |
2766 | buf + len, buflen - len, | |
2767 | "dot11RSNAConfigVersion=%u\n" | |
2768 | "dot11RSNAConfigPairwiseKeysSupported=9999\n" | |
2769 | /* FIX: dot11RSNAConfigGroupCipher */ | |
2770 | /* FIX: dot11RSNAConfigGroupRekeyMethod */ | |
2771 | /* FIX: dot11RSNAConfigGroupRekeyTime */ | |
2772 | /* FIX: dot11RSNAConfigGroupRekeyPackets */ | |
2773 | "dot11RSNAConfigGroupRekeyStrict=%u\n" | |
2774 | "dot11RSNAConfigGroupUpdateCount=%u\n" | |
2775 | "dot11RSNAConfigPairwiseUpdateCount=%u\n" | |
2776 | "dot11RSNAConfigGroupCipherSize=%u\n" | |
2777 | "dot11RSNAConfigPMKLifetime=%u\n" | |
2778 | "dot11RSNAConfigPMKReauthThreshold=%u\n" | |
2779 | "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n" | |
2780 | "dot11RSNAConfigSATimeout=%u\n" | |
2781 | "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" | |
2782 | "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" | |
2783 | "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" | |
2784 | "dot11RSNAPMKIDUsed=%s\n" | |
2785 | "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" | |
2786 | "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" | |
2787 | "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" | |
2788 | "dot11RSNATKIPCounterMeasuresInvoked=%u\n" | |
2789 | "dot11RSNA4WayHandshakeFailures=%u\n" | |
2790 | "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n", | |
2791 | RSN_VERSION, | |
2792 | !!wpa_auth->conf.wpa_strict_rekey, | |
2793 | dot11RSNAConfigGroupUpdateCount, | |
2794 | dot11RSNAConfigPairwiseUpdateCount, | |
c3550295 | 2795 | wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8, |
6fc6879b JM |
2796 | dot11RSNAConfigPMKLifetime, |
2797 | dot11RSNAConfigPMKReauthThreshold, | |
2798 | dot11RSNAConfigSATimeout, | |
2799 | RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected), | |
2800 | RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected), | |
2801 | RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected), | |
2802 | pmkid_txt, | |
2803 | RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested), | |
2804 | RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested), | |
2805 | RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested), | |
2806 | wpa_auth->dot11RSNATKIPCounterMeasuresInvoked, | |
2807 | wpa_auth->dot11RSNA4WayHandshakeFailures); | |
2808 | if (ret < 0 || (size_t) ret >= buflen - len) | |
2809 | return len; | |
2810 | len += ret; | |
2811 | ||
2812 | /* TODO: dot11RSNAConfigPairwiseCiphersTable */ | |
2813 | /* TODO: dot11RSNAConfigAuthenticationSuitesTable */ | |
2814 | ||
2815 | /* Private MIB */ | |
2816 | ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n", | |
2817 | wpa_auth->group->wpa_group_state); | |
2818 | if (ret < 0 || (size_t) ret >= buflen - len) | |
2819 | return len; | |
2820 | len += ret; | |
2821 | ||
2822 | return len; | |
2823 | } | |
2824 | ||
2825 | ||
2826 | int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen) | |
2827 | { | |
2828 | int len = 0, ret; | |
2829 | u32 pairwise = 0; | |
2830 | ||
2831 | if (sm == NULL) | |
2832 | return 0; | |
2833 | ||
2834 | /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */ | |
2835 | ||
2836 | /* dot11RSNAStatsEntry */ | |
2837 | ||
c3550295 JM |
2838 | pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ? |
2839 | WPA_PROTO_RSN : WPA_PROTO_WPA, | |
2840 | sm->pairwise); | |
2841 | if (pairwise == 0) | |
6fc6879b JM |
2842 | return 0; |
2843 | ||
2844 | ret = os_snprintf( | |
2845 | buf + len, buflen - len, | |
2846 | /* TODO: dot11RSNAStatsIndex */ | |
2847 | "dot11RSNAStatsSTAAddress=" MACSTR "\n" | |
2848 | "dot11RSNAStatsVersion=1\n" | |
2849 | "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n" | |
2850 | /* TODO: dot11RSNAStatsTKIPICVErrors */ | |
2851 | "dot11RSNAStatsTKIPLocalMICFailures=%u\n" | |
d9040cdb | 2852 | "dot11RSNAStatsTKIPRemoteMICFailures=%u\n" |
6fc6879b JM |
2853 | /* TODO: dot11RSNAStatsCCMPReplays */ |
2854 | /* TODO: dot11RSNAStatsCCMPDecryptErrors */ | |
2855 | /* TODO: dot11RSNAStatsTKIPReplays */, | |
2856 | MAC2STR(sm->addr), | |
2857 | RSN_SUITE_ARG(pairwise), | |
2858 | sm->dot11RSNAStatsTKIPLocalMICFailures, | |
2859 | sm->dot11RSNAStatsTKIPRemoteMICFailures); | |
2860 | if (ret < 0 || (size_t) ret >= buflen - len) | |
2861 | return len; | |
2862 | len += ret; | |
2863 | ||
2864 | /* Private MIB */ | |
2865 | ret = os_snprintf(buf + len, buflen - len, | |
2866 | "hostapdWPAPTKState=%d\n" | |
2867 | "hostapdWPAPTKGroupState=%d\n", | |
2868 | sm->wpa_ptk_state, | |
2869 | sm->wpa_ptk_group_state); | |
2870 | if (ret < 0 || (size_t) ret >= buflen - len) | |
2871 | return len; | |
2872 | len += ret; | |
2873 | ||
2874 | return len; | |
2875 | } | |
2876 | ||
2877 | ||
2878 | void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth) | |
2879 | { | |
2880 | if (wpa_auth) | |
2881 | wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++; | |
2882 | } | |
2883 | ||
2884 | ||
2885 | int wpa_auth_pairwise_set(struct wpa_state_machine *sm) | |
2886 | { | |
2887 | return sm && sm->pairwise_set; | |
2888 | } | |
2889 | ||
2890 | ||
ff36ff00 JM |
2891 | int wpa_auth_get_pairwise(struct wpa_state_machine *sm) |
2892 | { | |
2893 | return sm->pairwise; | |
2894 | } | |
2895 | ||
2896 | ||
6fc6879b JM |
2897 | int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm) |
2898 | { | |
2899 | if (sm == NULL) | |
2900 | return -1; | |
2901 | return sm->wpa_key_mgmt; | |
2902 | } | |
2903 | ||
2904 | ||
2905 | int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm) | |
2906 | { | |
2907 | if (sm == NULL) | |
2908 | return 0; | |
2909 | return sm->wpa; | |
2910 | } | |
2911 | ||
2912 | ||
2913 | int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm, | |
2914 | struct rsn_pmksa_cache_entry *entry) | |
2915 | { | |
2916 | if (sm == NULL || sm->pmksa != entry) | |
2917 | return -1; | |
2918 | sm->pmksa = NULL; | |
2919 | return 0; | |
2920 | } | |
2921 | ||
2922 | ||
2923 | struct rsn_pmksa_cache_entry * | |
2924 | wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm) | |
2925 | { | |
2926 | return sm ? sm->pmksa : NULL; | |
2927 | } | |
2928 | ||
2929 | ||
2930 | void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm) | |
2931 | { | |
2932 | if (sm) | |
2933 | sm->dot11RSNAStatsTKIPLocalMICFailures++; | |
2934 | } | |
2935 | ||
2936 | ||
2937 | const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len) | |
2938 | { | |
2939 | if (wpa_auth == NULL) | |
2940 | return NULL; | |
2941 | *len = wpa_auth->wpa_ie_len; | |
2942 | return wpa_auth->wpa_ie; | |
2943 | } | |
2944 | ||
2945 | ||
2946 | int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk, | |
2947 | int session_timeout, struct eapol_state_machine *eapol) | |
2948 | { | |
cb465555 JM |
2949 | if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 || |
2950 | sm->wpa_auth->conf.disable_pmksa_caching) | |
6fc6879b JM |
2951 | return -1; |
2952 | ||
4bb081f1 JM |
2953 | if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN, |
2954 | sm->wpa_auth->addr, sm->addr, session_timeout, | |
2955 | eapol, sm->wpa_key_mgmt)) | |
6fc6879b JM |
2956 | return 0; |
2957 | ||
2958 | return -1; | |
2959 | } | |
2960 | ||
2961 | ||
2962 | int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth, | |
2963 | const u8 *pmk, size_t len, const u8 *sta_addr, | |
2964 | int session_timeout, | |
2965 | struct eapol_state_machine *eapol) | |
2966 | { | |
2967 | if (wpa_auth == NULL) | |
2968 | return -1; | |
2969 | ||
4bb081f1 JM |
2970 | if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr, |
2971 | sta_addr, session_timeout, eapol, | |
2972 | WPA_KEY_MGMT_IEEE8021X)) | |
6fc6879b JM |
2973 | return 0; |
2974 | ||
2975 | return -1; | |
2976 | } | |
2977 | ||
2978 | ||
2979 | static struct wpa_group * | |
2980 | wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id) | |
2981 | { | |
2982 | struct wpa_group *group; | |
2983 | ||
2984 | if (wpa_auth == NULL || wpa_auth->group == NULL) | |
2985 | return NULL; | |
2986 | ||
2987 | wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d", | |
2988 | vlan_id); | |
bdffdc5d | 2989 | group = wpa_group_init(wpa_auth, vlan_id, 0); |
6fc6879b JM |
2990 | if (group == NULL) |
2991 | return NULL; | |
2992 | ||
2993 | group->next = wpa_auth->group->next; | |
2994 | wpa_auth->group->next = group; | |
2995 | ||
2996 | return group; | |
2997 | } | |
2998 | ||
2999 | ||
3000 | int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id) | |
3001 | { | |
3002 | struct wpa_group *group; | |
3003 | ||
3004 | if (sm == NULL || sm->wpa_auth == NULL) | |
3005 | return 0; | |
3006 | ||
3007 | group = sm->wpa_auth->group; | |
3008 | while (group) { | |
3009 | if (group->vlan_id == vlan_id) | |
3010 | break; | |
3011 | group = group->next; | |
3012 | } | |
3013 | ||
3014 | if (group == NULL) { | |
3015 | group = wpa_auth_add_group(sm->wpa_auth, vlan_id); | |
3016 | if (group == NULL) | |
3017 | return -1; | |
3018 | } | |
3019 | ||
3020 | if (sm->group == group) | |
3021 | return 0; | |
3022 | ||
3023 | wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state " | |
3024 | "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id); | |
3025 | ||
3026 | sm->group = group; | |
3027 | return 0; | |
3028 | } | |
e4bf4db9 JM |
3029 | |
3030 | ||
3031 | void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth, | |
3032 | struct wpa_state_machine *sm, int ack) | |
3033 | { | |
3034 | if (wpa_auth == NULL || sm == NULL) | |
3035 | return; | |
3036 | wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR | |
3037 | " ack=%d", MAC2STR(sm->addr), ack); | |
3038 | if (sm->pending_1_of_4_timeout && ack) { | |
3039 | /* | |
3040 | * Some deployed supplicant implementations update their SNonce | |
3041 | * for each EAPOL-Key 2/4 message even within the same 4-way | |
3042 | * handshake and then fail to use the first SNonce when | |
3043 | * deriving the PTK. This results in unsuccessful 4-way | |
3044 | * handshake whenever the relatively short initial timeout is | |
3045 | * reached and EAPOL-Key 1/4 is retransmitted. Try to work | |
3046 | * around this by increasing the timeout now that we know that | |
3047 | * the station has received the frame. | |
3048 | */ | |
3049 | int timeout_ms = eapol_key_timeout_subseq; | |
3050 | wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 " | |
3051 | "timeout by %u ms because of acknowledged frame", | |
3052 | timeout_ms); | |
3053 | eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); | |
3054 | eloop_register_timeout(timeout_ms / 1000, | |
3055 | (timeout_ms % 1000) * 1000, | |
3056 | wpa_send_eapol_timeout, wpa_auth, sm); | |
3057 | } | |
3058 | } |