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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 | ||
c772d054 | 57 | static inline int wpa_auth_mic_failure_report( |
6fc6879b JM |
58 | struct wpa_authenticator *wpa_auth, const u8 *addr) |
59 | { | |
60 | if (wpa_auth->cb.mic_failure_report) | |
c772d054 JM |
61 | return wpa_auth->cb.mic_failure_report(wpa_auth->cb.ctx, addr); |
62 | return 0; | |
6fc6879b JM |
63 | } |
64 | ||
65 | ||
66 | static inline void wpa_auth_set_eapol(struct wpa_authenticator *wpa_auth, | |
67 | const u8 *addr, wpa_eapol_variable var, | |
68 | int value) | |
69 | { | |
70 | if (wpa_auth->cb.set_eapol) | |
71 | wpa_auth->cb.set_eapol(wpa_auth->cb.ctx, addr, var, value); | |
72 | } | |
73 | ||
74 | ||
75 | static inline int wpa_auth_get_eapol(struct wpa_authenticator *wpa_auth, | |
76 | const u8 *addr, wpa_eapol_variable var) | |
77 | { | |
78 | if (wpa_auth->cb.get_eapol == NULL) | |
79 | return -1; | |
80 | return wpa_auth->cb.get_eapol(wpa_auth->cb.ctx, addr, var); | |
81 | } | |
82 | ||
83 | ||
84 | static inline const u8 * wpa_auth_get_psk(struct wpa_authenticator *wpa_auth, | |
85 | const u8 *addr, const u8 *prev_psk) | |
86 | { | |
87 | if (wpa_auth->cb.get_psk == NULL) | |
88 | return NULL; | |
89 | return wpa_auth->cb.get_psk(wpa_auth->cb.ctx, addr, prev_psk); | |
90 | } | |
91 | ||
92 | ||
93 | static inline int wpa_auth_get_msk(struct wpa_authenticator *wpa_auth, | |
94 | const u8 *addr, u8 *msk, size_t *len) | |
95 | { | |
96 | if (wpa_auth->cb.get_msk == NULL) | |
97 | return -1; | |
98 | return wpa_auth->cb.get_msk(wpa_auth->cb.ctx, addr, msk, len); | |
99 | } | |
100 | ||
101 | ||
102 | static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, | |
103 | int vlan_id, | |
71934751 | 104 | enum wpa_alg alg, const u8 *addr, int idx, |
6fc6879b JM |
105 | u8 *key, size_t key_len) |
106 | { | |
107 | if (wpa_auth->cb.set_key == NULL) | |
108 | return -1; | |
109 | return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, | |
110 | key, key_len); | |
111 | } | |
112 | ||
113 | ||
114 | static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, | |
115 | const u8 *addr, int idx, u8 *seq) | |
116 | { | |
117 | if (wpa_auth->cb.get_seqnum == NULL) | |
118 | return -1; | |
119 | return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); | |
120 | } | |
121 | ||
122 | ||
6fc6879b JM |
123 | static inline int |
124 | wpa_auth_send_eapol(struct wpa_authenticator *wpa_auth, const u8 *addr, | |
125 | const u8 *data, size_t data_len, int encrypt) | |
126 | { | |
127 | if (wpa_auth->cb.send_eapol == NULL) | |
128 | return -1; | |
129 | return wpa_auth->cb.send_eapol(wpa_auth->cb.ctx, addr, data, data_len, | |
130 | encrypt); | |
131 | } | |
132 | ||
133 | ||
134 | int wpa_auth_for_each_sta(struct wpa_authenticator *wpa_auth, | |
135 | int (*cb)(struct wpa_state_machine *sm, void *ctx), | |
136 | void *cb_ctx) | |
137 | { | |
138 | if (wpa_auth->cb.for_each_sta == NULL) | |
139 | return 0; | |
140 | return wpa_auth->cb.for_each_sta(wpa_auth->cb.ctx, cb, cb_ctx); | |
141 | } | |
142 | ||
143 | ||
bf98f7f3 JM |
144 | int wpa_auth_for_each_auth(struct wpa_authenticator *wpa_auth, |
145 | int (*cb)(struct wpa_authenticator *a, void *ctx), | |
146 | void *cb_ctx) | |
147 | { | |
148 | if (wpa_auth->cb.for_each_auth == NULL) | |
149 | return 0; | |
150 | return wpa_auth->cb.for_each_auth(wpa_auth->cb.ctx, cb, cb_ctx); | |
151 | } | |
152 | ||
153 | ||
6fc6879b JM |
154 | void wpa_auth_logger(struct wpa_authenticator *wpa_auth, const u8 *addr, |
155 | logger_level level, const char *txt) | |
156 | { | |
157 | if (wpa_auth->cb.logger == NULL) | |
158 | return; | |
159 | wpa_auth->cb.logger(wpa_auth->cb.ctx, addr, level, txt); | |
160 | } | |
161 | ||
162 | ||
163 | void wpa_auth_vlogger(struct wpa_authenticator *wpa_auth, const u8 *addr, | |
164 | logger_level level, const char *fmt, ...) | |
165 | { | |
166 | char *format; | |
167 | int maxlen; | |
168 | va_list ap; | |
169 | ||
170 | if (wpa_auth->cb.logger == NULL) | |
171 | return; | |
172 | ||
173 | maxlen = os_strlen(fmt) + 100; | |
174 | format = os_malloc(maxlen); | |
175 | if (!format) | |
176 | return; | |
177 | ||
178 | va_start(ap, fmt); | |
179 | vsnprintf(format, maxlen, fmt, ap); | |
180 | va_end(ap); | |
181 | ||
182 | wpa_auth_logger(wpa_auth, addr, level, format); | |
183 | ||
184 | os_free(format); | |
185 | } | |
186 | ||
187 | ||
188 | static void wpa_sta_disconnect(struct wpa_authenticator *wpa_auth, | |
189 | const u8 *addr) | |
190 | { | |
191 | if (wpa_auth->cb.disconnect == NULL) | |
192 | return; | |
afcc9ea1 | 193 | wpa_printf(MSG_DEBUG, "wpa_sta_disconnect STA " MACSTR, MAC2STR(addr)); |
6fc6879b JM |
194 | wpa_auth->cb.disconnect(wpa_auth->cb.ctx, addr, |
195 | WLAN_REASON_PREV_AUTH_NOT_VALID); | |
196 | } | |
197 | ||
198 | ||
199 | static int wpa_use_aes_cmac(struct wpa_state_machine *sm) | |
200 | { | |
56586197 | 201 | int ret = 0; |
6fc6879b | 202 | #ifdef CONFIG_IEEE80211R |
56586197 JM |
203 | if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) |
204 | ret = 1; | |
6fc6879b | 205 | #endif /* CONFIG_IEEE80211R */ |
56586197 JM |
206 | #ifdef CONFIG_IEEE80211W |
207 | if (wpa_key_mgmt_sha256(sm->wpa_key_mgmt)) | |
208 | ret = 1; | |
209 | #endif /* CONFIG_IEEE80211W */ | |
210 | return ret; | |
6fc6879b JM |
211 | } |
212 | ||
213 | ||
214 | static void wpa_rekey_gmk(void *eloop_ctx, void *timeout_ctx) | |
215 | { | |
216 | struct wpa_authenticator *wpa_auth = eloop_ctx; | |
217 | ||
3642c431 | 218 | if (random_get_bytes(wpa_auth->group->GMK, WPA_GMK_LEN)) { |
6fc6879b JM |
219 | wpa_printf(MSG_ERROR, "Failed to get random data for WPA " |
220 | "initialization."); | |
221 | } else { | |
222 | wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "GMK rekeyd"); | |
5cb9d5c3 JM |
223 | wpa_hexdump_key(MSG_DEBUG, "GMK", |
224 | wpa_auth->group->GMK, WPA_GMK_LEN); | |
6fc6879b JM |
225 | } |
226 | ||
227 | if (wpa_auth->conf.wpa_gmk_rekey) { | |
228 | eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, | |
229 | wpa_rekey_gmk, wpa_auth, NULL); | |
230 | } | |
231 | } | |
232 | ||
233 | ||
234 | static void wpa_rekey_gtk(void *eloop_ctx, void *timeout_ctx) | |
235 | { | |
236 | struct wpa_authenticator *wpa_auth = eloop_ctx; | |
237 | struct wpa_group *group; | |
238 | ||
239 | wpa_auth_logger(wpa_auth, NULL, LOGGER_DEBUG, "rekeying GTK"); | |
240 | for (group = wpa_auth->group; group; group = group->next) { | |
241 | group->GTKReKey = TRUE; | |
242 | do { | |
243 | group->changed = FALSE; | |
244 | wpa_group_sm_step(wpa_auth, group); | |
245 | } while (group->changed); | |
246 | } | |
247 | ||
248 | if (wpa_auth->conf.wpa_group_rekey) { | |
249 | eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, | |
250 | 0, wpa_rekey_gtk, wpa_auth, NULL); | |
251 | } | |
252 | } | |
253 | ||
254 | ||
581a8cde JM |
255 | static void wpa_rekey_ptk(void *eloop_ctx, void *timeout_ctx) |
256 | { | |
257 | struct wpa_authenticator *wpa_auth = eloop_ctx; | |
258 | struct wpa_state_machine *sm = timeout_ctx; | |
259 | ||
260 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "rekeying PTK"); | |
261 | wpa_request_new_ptk(sm); | |
262 | wpa_sm_step(sm); | |
263 | } | |
264 | ||
265 | ||
6fc6879b JM |
266 | static int wpa_auth_pmksa_clear_cb(struct wpa_state_machine *sm, void *ctx) |
267 | { | |
268 | if (sm->pmksa == ctx) | |
269 | sm->pmksa = NULL; | |
270 | return 0; | |
271 | } | |
272 | ||
273 | ||
274 | static void wpa_auth_pmksa_free_cb(struct rsn_pmksa_cache_entry *entry, | |
275 | void *ctx) | |
276 | { | |
277 | struct wpa_authenticator *wpa_auth = ctx; | |
278 | wpa_auth_for_each_sta(wpa_auth, wpa_auth_pmksa_clear_cb, entry); | |
279 | } | |
280 | ||
281 | ||
1bdb7ab3 JM |
282 | static int wpa_group_init_gmk_and_counter(struct wpa_authenticator *wpa_auth, |
283 | struct wpa_group *group) | |
284 | { | |
559cdabb | 285 | u8 buf[ETH_ALEN + 8 + sizeof(unsigned long)]; |
1bdb7ab3 | 286 | u8 rkey[32]; |
559cdabb | 287 | unsigned long ptr; |
1bdb7ab3 | 288 | |
3642c431 | 289 | if (random_get_bytes(group->GMK, WPA_GMK_LEN) < 0) |
1bdb7ab3 JM |
290 | return -1; |
291 | wpa_hexdump_key(MSG_DEBUG, "GMK", group->GMK, WPA_GMK_LEN); | |
292 | ||
293 | /* | |
294 | * Counter = PRF-256(Random number, "Init Counter", | |
295 | * Local MAC Address || Time) | |
296 | */ | |
297 | os_memcpy(buf, wpa_auth->addr, ETH_ALEN); | |
298 | wpa_get_ntp_timestamp(buf + ETH_ALEN); | |
559cdabb JM |
299 | ptr = (unsigned long) group; |
300 | os_memcpy(buf + ETH_ALEN + 8, &ptr, sizeof(ptr)); | |
3642c431 | 301 | if (random_get_bytes(rkey, sizeof(rkey)) < 0) |
1bdb7ab3 JM |
302 | return -1; |
303 | ||
304 | if (sha1_prf(rkey, sizeof(rkey), "Init Counter", buf, sizeof(buf), | |
305 | group->Counter, WPA_NONCE_LEN) < 0) | |
306 | return -1; | |
307 | wpa_hexdump_key(MSG_DEBUG, "Key Counter", | |
308 | group->Counter, WPA_NONCE_LEN); | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | ||
e6965d4e | 314 | static struct wpa_group * wpa_group_init(struct wpa_authenticator *wpa_auth, |
bdffdc5d | 315 | int vlan_id, int delay_init) |
e6965d4e JM |
316 | { |
317 | struct wpa_group *group; | |
e6965d4e JM |
318 | |
319 | group = os_zalloc(sizeof(struct wpa_group)); | |
320 | if (group == NULL) | |
321 | return NULL; | |
322 | ||
323 | group->GTKAuthenticator = TRUE; | |
324 | group->vlan_id = vlan_id; | |
c3550295 | 325 | group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); |
6fc6879b | 326 | |
08704cd8 JM |
327 | if (random_pool_ready() != 1) { |
328 | wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " | |
329 | "for secure operations - update keys later when " | |
330 | "the first station connects"); | |
331 | } | |
332 | ||
1bdb7ab3 JM |
333 | /* |
334 | * Set initial GMK/Counter value here. The actual values that will be | |
335 | * used in negotiations will be set once the first station tries to | |
336 | * connect. This allows more time for collecting additional randomness | |
337 | * on embedded devices. | |
6fc6879b | 338 | */ |
1bdb7ab3 | 339 | if (wpa_group_init_gmk_and_counter(wpa_auth, group) < 0) { |
6fc6879b JM |
340 | wpa_printf(MSG_ERROR, "Failed to get random data for WPA " |
341 | "initialization."); | |
342 | os_free(group); | |
343 | return NULL; | |
344 | } | |
6fc6879b JM |
345 | |
346 | group->GInit = TRUE; | |
bdffdc5d JM |
347 | if (delay_init) { |
348 | wpa_printf(MSG_DEBUG, "WPA: Delay group state machine start " | |
349 | "until Beacon frames have been configured"); | |
350 | /* Initialization is completed in wpa_init_keys(). */ | |
351 | } else { | |
352 | wpa_group_sm_step(wpa_auth, group); | |
353 | group->GInit = FALSE; | |
354 | wpa_group_sm_step(wpa_auth, group); | |
355 | } | |
6fc6879b JM |
356 | |
357 | return group; | |
358 | } | |
359 | ||
360 | ||
361 | /** | |
362 | * wpa_init - Initialize WPA authenticator | |
363 | * @addr: Authenticator address | |
364 | * @conf: Configuration for WPA authenticator | |
a17df5fb | 365 | * @cb: Callback functions for WPA authenticator |
6fc6879b JM |
366 | * Returns: Pointer to WPA authenticator data or %NULL on failure |
367 | */ | |
368 | struct wpa_authenticator * wpa_init(const u8 *addr, | |
369 | struct wpa_auth_config *conf, | |
370 | struct wpa_auth_callbacks *cb) | |
371 | { | |
372 | struct wpa_authenticator *wpa_auth; | |
373 | ||
374 | wpa_auth = os_zalloc(sizeof(struct wpa_authenticator)); | |
375 | if (wpa_auth == NULL) | |
376 | return NULL; | |
377 | os_memcpy(wpa_auth->addr, addr, ETH_ALEN); | |
378 | os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); | |
379 | os_memcpy(&wpa_auth->cb, cb, sizeof(*cb)); | |
380 | ||
381 | if (wpa_auth_gen_wpa_ie(wpa_auth)) { | |
382 | wpa_printf(MSG_ERROR, "Could not generate WPA IE."); | |
383 | os_free(wpa_auth); | |
384 | return NULL; | |
385 | } | |
386 | ||
bdffdc5d | 387 | wpa_auth->group = wpa_group_init(wpa_auth, 0, 1); |
6fc6879b JM |
388 | if (wpa_auth->group == NULL) { |
389 | os_free(wpa_auth->wpa_ie); | |
390 | os_free(wpa_auth); | |
391 | return NULL; | |
392 | } | |
393 | ||
4bb081f1 JM |
394 | wpa_auth->pmksa = pmksa_cache_auth_init(wpa_auth_pmksa_free_cb, |
395 | wpa_auth); | |
6fc6879b JM |
396 | if (wpa_auth->pmksa == NULL) { |
397 | wpa_printf(MSG_ERROR, "PMKSA cache initialization failed."); | |
398 | os_free(wpa_auth->wpa_ie); | |
399 | os_free(wpa_auth); | |
400 | return NULL; | |
401 | } | |
402 | ||
403 | #ifdef CONFIG_IEEE80211R | |
404 | wpa_auth->ft_pmk_cache = wpa_ft_pmk_cache_init(); | |
405 | if (wpa_auth->ft_pmk_cache == NULL) { | |
406 | wpa_printf(MSG_ERROR, "FT PMK cache initialization failed."); | |
407 | os_free(wpa_auth->wpa_ie); | |
4bb081f1 | 408 | pmksa_cache_auth_deinit(wpa_auth->pmksa); |
6fc6879b JM |
409 | os_free(wpa_auth); |
410 | return NULL; | |
411 | } | |
412 | #endif /* CONFIG_IEEE80211R */ | |
413 | ||
414 | if (wpa_auth->conf.wpa_gmk_rekey) { | |
415 | eloop_register_timeout(wpa_auth->conf.wpa_gmk_rekey, 0, | |
416 | wpa_rekey_gmk, wpa_auth, NULL); | |
417 | } | |
418 | ||
419 | if (wpa_auth->conf.wpa_group_rekey) { | |
420 | eloop_register_timeout(wpa_auth->conf.wpa_group_rekey, 0, | |
421 | wpa_rekey_gtk, wpa_auth, NULL); | |
422 | } | |
423 | ||
424 | return wpa_auth; | |
425 | } | |
426 | ||
427 | ||
bdffdc5d JM |
428 | int wpa_init_keys(struct wpa_authenticator *wpa_auth) |
429 | { | |
430 | struct wpa_group *group = wpa_auth->group; | |
431 | ||
432 | wpa_printf(MSG_DEBUG, "WPA: Start group state machine to set initial " | |
433 | "keys"); | |
434 | wpa_group_sm_step(wpa_auth, group); | |
435 | group->GInit = FALSE; | |
436 | wpa_group_sm_step(wpa_auth, group); | |
437 | return 0; | |
438 | } | |
439 | ||
440 | ||
6fc6879b JM |
441 | /** |
442 | * wpa_deinit - Deinitialize WPA authenticator | |
443 | * @wpa_auth: Pointer to WPA authenticator data from wpa_init() | |
444 | */ | |
445 | void wpa_deinit(struct wpa_authenticator *wpa_auth) | |
446 | { | |
447 | struct wpa_group *group, *prev; | |
448 | ||
449 | eloop_cancel_timeout(wpa_rekey_gmk, wpa_auth, NULL); | |
450 | eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); | |
451 | ||
452 | #ifdef CONFIG_PEERKEY | |
453 | while (wpa_auth->stsl_negotiations) | |
454 | wpa_stsl_remove(wpa_auth, wpa_auth->stsl_negotiations); | |
455 | #endif /* CONFIG_PEERKEY */ | |
456 | ||
4bb081f1 | 457 | pmksa_cache_auth_deinit(wpa_auth->pmksa); |
6fc6879b JM |
458 | |
459 | #ifdef CONFIG_IEEE80211R | |
460 | wpa_ft_pmk_cache_deinit(wpa_auth->ft_pmk_cache); | |
461 | wpa_auth->ft_pmk_cache = NULL; | |
462 | #endif /* CONFIG_IEEE80211R */ | |
463 | ||
464 | os_free(wpa_auth->wpa_ie); | |
465 | ||
466 | group = wpa_auth->group; | |
467 | while (group) { | |
468 | prev = group; | |
469 | group = group->next; | |
470 | os_free(prev); | |
471 | } | |
472 | ||
473 | os_free(wpa_auth); | |
474 | } | |
475 | ||
476 | ||
477 | /** | |
478 | * wpa_reconfig - Update WPA authenticator configuration | |
479 | * @wpa_auth: Pointer to WPA authenticator data from wpa_init() | |
480 | * @conf: Configuration for WPA authenticator | |
481 | */ | |
482 | int wpa_reconfig(struct wpa_authenticator *wpa_auth, | |
483 | struct wpa_auth_config *conf) | |
484 | { | |
e6965d4e | 485 | struct wpa_group *group; |
6fc6879b JM |
486 | if (wpa_auth == NULL) |
487 | return 0; | |
488 | ||
489 | os_memcpy(&wpa_auth->conf, conf, sizeof(*conf)); | |
ad08c363 JM |
490 | if (wpa_auth_gen_wpa_ie(wpa_auth)) { |
491 | wpa_printf(MSG_ERROR, "Could not generate WPA IE."); | |
492 | return -1; | |
493 | } | |
494 | ||
e6965d4e JM |
495 | /* |
496 | * Reinitialize GTK to make sure it is suitable for the new | |
497 | * configuration. | |
498 | */ | |
499 | group = wpa_auth->group; | |
c3550295 | 500 | group->GTK_len = wpa_cipher_key_len(wpa_auth->conf.wpa_group); |
e6965d4e JM |
501 | group->GInit = TRUE; |
502 | wpa_group_sm_step(wpa_auth, group); | |
503 | group->GInit = FALSE; | |
504 | wpa_group_sm_step(wpa_auth, group); | |
505 | ||
6fc6879b JM |
506 | return 0; |
507 | } | |
508 | ||
509 | ||
510 | struct wpa_state_machine * | |
511 | wpa_auth_sta_init(struct wpa_authenticator *wpa_auth, const u8 *addr) | |
512 | { | |
513 | struct wpa_state_machine *sm; | |
514 | ||
515 | sm = os_zalloc(sizeof(struct wpa_state_machine)); | |
516 | if (sm == NULL) | |
517 | return NULL; | |
518 | os_memcpy(sm->addr, addr, ETH_ALEN); | |
519 | ||
520 | sm->wpa_auth = wpa_auth; | |
521 | sm->group = wpa_auth->group; | |
522 | ||
523 | return sm; | |
524 | } | |
525 | ||
526 | ||
6f9b5d16 JM |
527 | int wpa_auth_sta_associated(struct wpa_authenticator *wpa_auth, |
528 | struct wpa_state_machine *sm) | |
6fc6879b JM |
529 | { |
530 | if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) | |
6f9b5d16 | 531 | return -1; |
6fc6879b JM |
532 | |
533 | #ifdef CONFIG_IEEE80211R | |
534 | if (sm->ft_completed) { | |
535 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
536 | "FT authentication already completed - do not " | |
537 | "start 4-way handshake"); | |
6f9b5d16 | 538 | return 0; |
6fc6879b JM |
539 | } |
540 | #endif /* CONFIG_IEEE80211R */ | |
541 | ||
542 | if (sm->started) { | |
22a299ee | 543 | os_memset(&sm->key_replay, 0, sizeof(sm->key_replay)); |
6fc6879b | 544 | sm->ReAuthenticationRequest = TRUE; |
6f9b5d16 | 545 | return wpa_sm_step(sm); |
6fc6879b JM |
546 | } |
547 | ||
548 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
549 | "start authentication"); | |
550 | sm->started = 1; | |
551 | ||
552 | sm->Init = TRUE; | |
e4a6ea1d | 553 | if (wpa_sm_step(sm) == 1) |
6f9b5d16 | 554 | return 1; /* should not really happen */ |
6fc6879b JM |
555 | sm->Init = FALSE; |
556 | sm->AuthenticationRequest = TRUE; | |
6f9b5d16 | 557 | return wpa_sm_step(sm); |
6fc6879b JM |
558 | } |
559 | ||
560 | ||
a8d05fca JM |
561 | void wpa_auth_sta_no_wpa(struct wpa_state_machine *sm) |
562 | { | |
563 | /* WPA/RSN was not used - clear WPA state. This is needed if the STA | |
564 | * reassociates back to the same AP while the previous entry for the | |
565 | * STA has not yet been removed. */ | |
566 | if (sm == NULL) | |
567 | return; | |
568 | ||
569 | sm->wpa_key_mgmt = 0; | |
570 | } | |
571 | ||
572 | ||
6fc6879b JM |
573 | static void wpa_free_sta_sm(struct wpa_state_machine *sm) |
574 | { | |
2ade8ef2 JM |
575 | if (sm->GUpdateStationKeys) { |
576 | sm->group->GKeyDoneStations--; | |
577 | sm->GUpdateStationKeys = FALSE; | |
578 | } | |
0f857f43 JM |
579 | #ifdef CONFIG_IEEE80211R |
580 | os_free(sm->assoc_resp_ftie); | |
581 | #endif /* CONFIG_IEEE80211R */ | |
6fc6879b JM |
582 | os_free(sm->last_rx_eapol_key); |
583 | os_free(sm->wpa_ie); | |
584 | os_free(sm); | |
585 | } | |
586 | ||
587 | ||
588 | void wpa_auth_sta_deinit(struct wpa_state_machine *sm) | |
589 | { | |
590 | if (sm == NULL) | |
591 | return; | |
592 | ||
593 | if (sm->wpa_auth->conf.wpa_strict_rekey && sm->has_GTK) { | |
594 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
595 | "strict rekeying - force GTK rekey since STA " | |
596 | "is leaving"); | |
597 | eloop_cancel_timeout(wpa_rekey_gtk, sm->wpa_auth, NULL); | |
598 | eloop_register_timeout(0, 500000, wpa_rekey_gtk, sm->wpa_auth, | |
599 | NULL); | |
600 | } | |
601 | ||
602 | eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); | |
e4bf4db9 | 603 | sm->pending_1_of_4_timeout = 0; |
6fc6879b | 604 | eloop_cancel_timeout(wpa_sm_call_step, sm, NULL); |
581a8cde | 605 | eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); |
6fc6879b JM |
606 | if (sm->in_step_loop) { |
607 | /* Must not free state machine while wpa_sm_step() is running. | |
608 | * Freeing will be completed in the end of wpa_sm_step(). */ | |
609 | wpa_printf(MSG_DEBUG, "WPA: Registering pending STA state " | |
610 | "machine deinit for " MACSTR, MAC2STR(sm->addr)); | |
611 | sm->pending_deinit = 1; | |
612 | } else | |
613 | wpa_free_sta_sm(sm); | |
614 | } | |
615 | ||
616 | ||
617 | static void wpa_request_new_ptk(struct wpa_state_machine *sm) | |
618 | { | |
619 | if (sm == NULL) | |
620 | return; | |
621 | ||
622 | sm->PTKRequest = TRUE; | |
623 | sm->PTK_valid = 0; | |
624 | } | |
625 | ||
626 | ||
68921e24 | 627 | static int wpa_replay_counter_valid(struct wpa_key_replay_counter *ctr, |
22a299ee JM |
628 | const u8 *replay_counter) |
629 | { | |
630 | int i; | |
631 | for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { | |
68921e24 | 632 | if (!ctr[i].valid) |
22a299ee | 633 | break; |
68921e24 | 634 | if (os_memcmp(replay_counter, ctr[i].counter, |
22a299ee JM |
635 | WPA_REPLAY_COUNTER_LEN) == 0) |
636 | return 1; | |
637 | } | |
638 | return 0; | |
639 | } | |
640 | ||
641 | ||
68921e24 JM |
642 | static void wpa_replay_counter_mark_invalid(struct wpa_key_replay_counter *ctr, |
643 | const u8 *replay_counter) | |
644 | { | |
645 | int i; | |
646 | for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { | |
647 | if (ctr[i].valid && | |
648 | (replay_counter == NULL || | |
649 | os_memcmp(replay_counter, ctr[i].counter, | |
650 | WPA_REPLAY_COUNTER_LEN) == 0)) | |
651 | ctr[i].valid = FALSE; | |
652 | } | |
653 | } | |
654 | ||
655 | ||
0f857f43 JM |
656 | #ifdef CONFIG_IEEE80211R |
657 | static int ft_check_msg_2_of_4(struct wpa_authenticator *wpa_auth, | |
658 | struct wpa_state_machine *sm, | |
659 | struct wpa_eapol_ie_parse *kde) | |
660 | { | |
661 | struct wpa_ie_data ie; | |
662 | struct rsn_mdie *mdie; | |
663 | ||
664 | if (wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0 || | |
665 | ie.num_pmkid != 1 || ie.pmkid == NULL) { | |
666 | wpa_printf(MSG_DEBUG, "FT: No PMKR1Name in " | |
667 | "FT 4-way handshake message 2/4"); | |
668 | return -1; | |
669 | } | |
670 | ||
671 | os_memcpy(sm->sup_pmk_r1_name, ie.pmkid, PMKID_LEN); | |
672 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from Supplicant", | |
673 | sm->sup_pmk_r1_name, PMKID_LEN); | |
674 | ||
675 | if (!kde->mdie || !kde->ftie) { | |
676 | wpa_printf(MSG_DEBUG, "FT: No %s in FT 4-way handshake " | |
677 | "message 2/4", kde->mdie ? "FTIE" : "MDIE"); | |
678 | return -1; | |
679 | } | |
680 | ||
681 | mdie = (struct rsn_mdie *) (kde->mdie + 2); | |
682 | if (kde->mdie[1] < sizeof(struct rsn_mdie) || | |
683 | os_memcmp(wpa_auth->conf.mobility_domain, mdie->mobility_domain, | |
684 | MOBILITY_DOMAIN_ID_LEN) != 0) { | |
685 | wpa_printf(MSG_DEBUG, "FT: MDIE mismatch"); | |
686 | return -1; | |
687 | } | |
688 | ||
689 | if (sm->assoc_resp_ftie && | |
690 | (kde->ftie[1] != sm->assoc_resp_ftie[1] || | |
691 | os_memcmp(kde->ftie, sm->assoc_resp_ftie, | |
692 | 2 + sm->assoc_resp_ftie[1]) != 0)) { | |
693 | wpa_printf(MSG_DEBUG, "FT: FTIE mismatch"); | |
694 | wpa_hexdump(MSG_DEBUG, "FT: FTIE in EAPOL-Key msg 2/4", | |
695 | kde->ftie, kde->ftie_len); | |
696 | wpa_hexdump(MSG_DEBUG, "FT: FTIE in (Re)AssocResp", | |
697 | sm->assoc_resp_ftie, 2 + sm->assoc_resp_ftie[1]); | |
698 | return -1; | |
699 | } | |
700 | ||
701 | return 0; | |
702 | } | |
703 | #endif /* CONFIG_IEEE80211R */ | |
704 | ||
705 | ||
c772d054 JM |
706 | static int wpa_receive_error_report(struct wpa_authenticator *wpa_auth, |
707 | struct wpa_state_machine *sm, int group) | |
ec027805 JM |
708 | { |
709 | /* Supplicant reported a Michael MIC error */ | |
710 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, | |
711 | "received EAPOL-Key Error Request " | |
712 | "(STA detected Michael MIC failure (group=%d))", | |
713 | group); | |
fbc72d32 JM |
714 | |
715 | if (group && wpa_auth->conf.wpa_group != WPA_CIPHER_TKIP) { | |
716 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
717 | "ignore Michael MIC failure report since " | |
718 | "group cipher is not TKIP"); | |
719 | } else if (!group && sm->pairwise != WPA_CIPHER_TKIP) { | |
720 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
721 | "ignore Michael MIC failure report since " | |
722 | "pairwise cipher is not TKIP"); | |
723 | } else { | |
c772d054 JM |
724 | if (wpa_auth_mic_failure_report(wpa_auth, sm->addr) > 0) |
725 | return 1; /* STA entry was removed */ | |
fbc72d32 JM |
726 | sm->dot11RSNAStatsTKIPRemoteMICFailures++; |
727 | wpa_auth->dot11RSNAStatsTKIPRemoteMICFailures++; | |
728 | } | |
ec027805 JM |
729 | |
730 | /* | |
731 | * Error report is not a request for a new key handshake, but since | |
732 | * Authenticator may do it, let's change the keys now anyway. | |
733 | */ | |
734 | wpa_request_new_ptk(sm); | |
c772d054 | 735 | return 0; |
ec027805 JM |
736 | } |
737 | ||
738 | ||
6fc6879b JM |
739 | void wpa_receive(struct wpa_authenticator *wpa_auth, |
740 | struct wpa_state_machine *sm, | |
741 | u8 *data, size_t data_len) | |
742 | { | |
743 | struct ieee802_1x_hdr *hdr; | |
744 | struct wpa_eapol_key *key; | |
745 | u16 key_info, key_data_length; | |
746 | enum { PAIRWISE_2, PAIRWISE_4, GROUP_2, REQUEST, | |
747 | SMK_M1, SMK_M3, SMK_ERROR } msg; | |
748 | char *msgtxt; | |
749 | struct wpa_eapol_ie_parse kde; | |
26e23750 | 750 | int ft; |
1566ec46 JM |
751 | const u8 *eapol_key_ie; |
752 | size_t eapol_key_ie_len; | |
6fc6879b JM |
753 | |
754 | if (wpa_auth == NULL || !wpa_auth->conf.wpa || sm == NULL) | |
755 | return; | |
756 | ||
757 | if (data_len < sizeof(*hdr) + sizeof(*key)) | |
758 | return; | |
759 | ||
760 | hdr = (struct ieee802_1x_hdr *) data; | |
761 | key = (struct wpa_eapol_key *) (hdr + 1); | |
762 | key_info = WPA_GET_BE16(key->key_info); | |
763 | key_data_length = WPA_GET_BE16(key->key_data_length); | |
0d442aff JM |
764 | wpa_printf(MSG_DEBUG, "WPA: Received EAPOL-Key from " MACSTR |
765 | " key_info=0x%x type=%u key_data_length=%u", | |
766 | MAC2STR(sm->addr), key_info, key->type, key_data_length); | |
6fc6879b JM |
767 | if (key_data_length > data_len - sizeof(*hdr) - sizeof(*key)) { |
768 | wpa_printf(MSG_INFO, "WPA: Invalid EAPOL-Key frame - " | |
769 | "key_data overflow (%d > %lu)", | |
770 | key_data_length, | |
771 | (unsigned long) (data_len - sizeof(*hdr) - | |
772 | sizeof(*key))); | |
773 | return; | |
774 | } | |
775 | ||
f8e96eb6 | 776 | if (sm->wpa == WPA_VERSION_WPA2) { |
74590e71 JM |
777 | if (key->type == EAPOL_KEY_TYPE_WPA) { |
778 | /* | |
779 | * Some deployed station implementations seem to send | |
780 | * msg 4/4 with incorrect type value in WPA2 mode. | |
781 | */ | |
782 | wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key " | |
783 | "with unexpected WPA type in RSN mode"); | |
784 | } else if (key->type != EAPOL_KEY_TYPE_RSN) { | |
f8e96eb6 JM |
785 | wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " |
786 | "unexpected type %d in RSN mode", | |
787 | key->type); | |
788 | return; | |
789 | } | |
790 | } else { | |
791 | if (key->type != EAPOL_KEY_TYPE_WPA) { | |
792 | wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with " | |
793 | "unexpected type %d in WPA mode", | |
794 | key->type); | |
795 | return; | |
796 | } | |
797 | } | |
798 | ||
bc8318ac JM |
799 | wpa_hexdump(MSG_DEBUG, "WPA: Received Key Nonce", key->key_nonce, |
800 | WPA_NONCE_LEN); | |
801 | wpa_hexdump(MSG_DEBUG, "WPA: Received Replay Counter", | |
802 | key->replay_counter, WPA_REPLAY_COUNTER_LEN); | |
803 | ||
6fc6879b JM |
804 | /* FIX: verify that the EAPOL-Key frame was encrypted if pairwise keys |
805 | * are set */ | |
806 | ||
807 | if ((key_info & (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) == | |
808 | (WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_REQUEST)) { | |
809 | if (key_info & WPA_KEY_INFO_ERROR) { | |
810 | msg = SMK_ERROR; | |
811 | msgtxt = "SMK Error"; | |
812 | } else { | |
813 | msg = SMK_M1; | |
814 | msgtxt = "SMK M1"; | |
815 | } | |
816 | } else if (key_info & WPA_KEY_INFO_SMK_MESSAGE) { | |
817 | msg = SMK_M3; | |
818 | msgtxt = "SMK M3"; | |
819 | } else if (key_info & WPA_KEY_INFO_REQUEST) { | |
820 | msg = REQUEST; | |
821 | msgtxt = "Request"; | |
822 | } else if (!(key_info & WPA_KEY_INFO_KEY_TYPE)) { | |
823 | msg = GROUP_2; | |
824 | msgtxt = "2/2 Group"; | |
825 | } else if (key_data_length == 0) { | |
826 | msg = PAIRWISE_4; | |
827 | msgtxt = "4/4 Pairwise"; | |
828 | } else { | |
829 | msg = PAIRWISE_2; | |
830 | msgtxt = "2/4 Pairwise"; | |
831 | } | |
832 | ||
833 | /* TODO: key_info type validation for PeerKey */ | |
834 | if (msg == REQUEST || msg == PAIRWISE_2 || msg == PAIRWISE_4 || | |
835 | msg == GROUP_2) { | |
836 | u16 ver = key_info & WPA_KEY_INFO_TYPE_MASK; | |
eb7719ff JM |
837 | if (sm->pairwise == WPA_CIPHER_CCMP || |
838 | sm->pairwise == WPA_CIPHER_GCMP) { | |
6fc6879b JM |
839 | if (wpa_use_aes_cmac(sm) && |
840 | ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) { | |
841 | wpa_auth_logger(wpa_auth, sm->addr, | |
842 | LOGGER_WARNING, | |
843 | "advertised support for " | |
844 | "AES-128-CMAC, but did not " | |
845 | "use it"); | |
846 | return; | |
847 | } | |
848 | ||
849 | if (!wpa_use_aes_cmac(sm) && | |
850 | ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) { | |
851 | wpa_auth_logger(wpa_auth, sm->addr, | |
852 | LOGGER_WARNING, | |
853 | "did not use HMAC-SHA1-AES " | |
eb7719ff | 854 | "with CCMP/GCMP"); |
6fc6879b JM |
855 | return; |
856 | } | |
857 | } | |
858 | } | |
859 | ||
860 | if (key_info & WPA_KEY_INFO_REQUEST) { | |
861 | if (sm->req_replay_counter_used && | |
862 | os_memcmp(key->replay_counter, sm->req_replay_counter, | |
863 | WPA_REPLAY_COUNTER_LEN) <= 0) { | |
864 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_WARNING, | |
865 | "received EAPOL-Key request with " | |
866 | "replayed counter"); | |
867 | return; | |
868 | } | |
869 | } | |
870 | ||
871 | if (!(key_info & WPA_KEY_INFO_REQUEST) && | |
68921e24 | 872 | !wpa_replay_counter_valid(sm->key_replay, key->replay_counter)) { |
22a299ee | 873 | int i; |
68921e24 JM |
874 | |
875 | if (msg == PAIRWISE_2 && | |
876 | wpa_replay_counter_valid(sm->prev_key_replay, | |
877 | key->replay_counter) && | |
878 | sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING && | |
879 | os_memcmp(sm->SNonce, key->key_nonce, WPA_NONCE_LEN) != 0) | |
880 | { | |
881 | /* | |
882 | * Some supplicant implementations (e.g., Windows XP | |
883 | * WZC) update SNonce for each EAPOL-Key 2/4. This | |
884 | * breaks the workaround on accepting any of the | |
885 | * pending requests, so allow the SNonce to be updated | |
886 | * even if we have already sent out EAPOL-Key 3/4. | |
887 | */ | |
888 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
889 | "Process SNonce update from STA " | |
890 | "based on retransmitted EAPOL-Key " | |
891 | "1/4"); | |
892 | sm->update_snonce = 1; | |
893 | wpa_replay_counter_mark_invalid(sm->prev_key_replay, | |
894 | key->replay_counter); | |
895 | goto continue_processing; | |
896 | } | |
897 | ||
898 | if (msg == PAIRWISE_2 && | |
899 | wpa_replay_counter_valid(sm->prev_key_replay, | |
900 | key->replay_counter) && | |
901 | sm->wpa_ptk_state == WPA_PTK_PTKINITNEGOTIATING) { | |
902 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
903 | "ignore retransmitted EAPOL-Key %s - " | |
904 | "SNonce did not change", msgtxt); | |
905 | } else { | |
906 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
907 | "received EAPOL-Key %s with " | |
908 | "unexpected replay counter", msgtxt); | |
909 | } | |
22a299ee JM |
910 | for (i = 0; i < RSNA_MAX_EAPOL_RETRIES; i++) { |
911 | if (!sm->key_replay[i].valid) | |
912 | break; | |
913 | wpa_hexdump(MSG_DEBUG, "pending replay counter", | |
914 | sm->key_replay[i].counter, | |
915 | WPA_REPLAY_COUNTER_LEN); | |
916 | } | |
6fc6879b JM |
917 | wpa_hexdump(MSG_DEBUG, "received replay counter", |
918 | key->replay_counter, WPA_REPLAY_COUNTER_LEN); | |
919 | return; | |
920 | } | |
921 | ||
68921e24 | 922 | continue_processing: |
6fc6879b JM |
923 | switch (msg) { |
924 | case PAIRWISE_2: | |
925 | if (sm->wpa_ptk_state != WPA_PTK_PTKSTART && | |
68921e24 JM |
926 | sm->wpa_ptk_state != WPA_PTK_PTKCALCNEGOTIATING && |
927 | (!sm->update_snonce || | |
928 | sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING)) { | |
6fc6879b JM |
929 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, |
930 | "received EAPOL-Key msg 2/4 in " | |
931 | "invalid state (%d) - dropped", | |
932 | sm->wpa_ptk_state); | |
933 | return; | |
934 | } | |
bbb921da | 935 | random_add_randomness(key->key_nonce, WPA_NONCE_LEN); |
08704cd8 JM |
936 | if (sm->group->reject_4way_hs_for_entropy) { |
937 | /* | |
938 | * The system did not have enough entropy to generate | |
939 | * strong random numbers. Reject the first 4-way | |
940 | * handshake(s) and collect some entropy based on the | |
941 | * information from it. Once enough entropy is | |
942 | * available, the next atempt will trigger GMK/Key | |
943 | * Counter update and the station will be allowed to | |
944 | * continue. | |
945 | */ | |
946 | wpa_printf(MSG_DEBUG, "WPA: Reject 4-way handshake to " | |
947 | "collect more entropy for random number " | |
948 | "generation"); | |
08704cd8 | 949 | random_mark_pool_ready(); |
08704cd8 JM |
950 | wpa_sta_disconnect(wpa_auth, sm->addr); |
951 | return; | |
952 | } | |
1566ec46 JM |
953 | if (wpa_parse_kde_ies((u8 *) (key + 1), key_data_length, |
954 | &kde) < 0) { | |
955 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, | |
956 | "received EAPOL-Key msg 2/4 with " | |
957 | "invalid Key Data contents"); | |
958 | return; | |
959 | } | |
960 | if (kde.rsn_ie) { | |
961 | eapol_key_ie = kde.rsn_ie; | |
962 | eapol_key_ie_len = kde.rsn_ie_len; | |
963 | } else { | |
964 | eapol_key_ie = kde.wpa_ie; | |
965 | eapol_key_ie_len = kde.wpa_ie_len; | |
966 | } | |
26e23750 JM |
967 | ft = sm->wpa == WPA_VERSION_WPA2 && |
968 | wpa_key_mgmt_ft(sm->wpa_key_mgmt); | |
6fc6879b | 969 | if (sm->wpa_ie == NULL || |
26e23750 JM |
970 | wpa_compare_rsn_ie(ft, |
971 | sm->wpa_ie, sm->wpa_ie_len, | |
1566ec46 | 972 | eapol_key_ie, eapol_key_ie_len)) { |
6fc6879b JM |
973 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, |
974 | "WPA IE from (Re)AssocReq did not " | |
975 | "match with msg 2/4"); | |
976 | if (sm->wpa_ie) { | |
977 | wpa_hexdump(MSG_DEBUG, "WPA IE in AssocReq", | |
978 | sm->wpa_ie, sm->wpa_ie_len); | |
979 | } | |
980 | wpa_hexdump(MSG_DEBUG, "WPA IE in msg 2/4", | |
1566ec46 | 981 | eapol_key_ie, eapol_key_ie_len); |
6fc6879b JM |
982 | /* MLME-DEAUTHENTICATE.request */ |
983 | wpa_sta_disconnect(wpa_auth, sm->addr); | |
984 | return; | |
985 | } | |
26e23750 | 986 | #ifdef CONFIG_IEEE80211R |
0f857f43 JM |
987 | if (ft && ft_check_msg_2_of_4(wpa_auth, sm, &kde) < 0) { |
988 | wpa_sta_disconnect(wpa_auth, sm->addr); | |
989 | return; | |
26e23750 JM |
990 | } |
991 | #endif /* CONFIG_IEEE80211R */ | |
6fc6879b JM |
992 | break; |
993 | case PAIRWISE_4: | |
994 | if (sm->wpa_ptk_state != WPA_PTK_PTKINITNEGOTIATING || | |
995 | !sm->PTK_valid) { | |
996 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, | |
997 | "received EAPOL-Key msg 4/4 in " | |
998 | "invalid state (%d) - dropped", | |
999 | sm->wpa_ptk_state); | |
1000 | return; | |
1001 | } | |
1002 | break; | |
1003 | case GROUP_2: | |
1004 | if (sm->wpa_ptk_group_state != WPA_PTK_GROUP_REKEYNEGOTIATING | |
1005 | || !sm->PTK_valid) { | |
1006 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO, | |
1007 | "received EAPOL-Key msg 2/2 in " | |
1008 | "invalid state (%d) - dropped", | |
1009 | sm->wpa_ptk_group_state); | |
1010 | return; | |
1011 | } | |
1012 | break; | |
1013 | #ifdef CONFIG_PEERKEY | |
1014 | case SMK_M1: | |
1015 | case SMK_M3: | |
1016 | case SMK_ERROR: | |
1017 | if (!wpa_auth->conf.peerkey) { | |
1018 | wpa_printf(MSG_DEBUG, "RSN: SMK M1/M3/Error, but " | |
1019 | "PeerKey use disabled - ignoring message"); | |
1020 | return; | |
1021 | } | |
1022 | if (!sm->PTK_valid) { | |
1023 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1024 | "received EAPOL-Key msg SMK in " | |
1025 | "invalid state - dropped"); | |
1026 | return; | |
1027 | } | |
1028 | break; | |
1029 | #else /* CONFIG_PEERKEY */ | |
1030 | case SMK_M1: | |
1031 | case SMK_M3: | |
1032 | case SMK_ERROR: | |
1033 | return; /* STSL disabled - ignore SMK messages */ | |
1034 | #endif /* CONFIG_PEERKEY */ | |
1035 | case REQUEST: | |
1036 | break; | |
1037 | } | |
1038 | ||
1039 | wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
1040 | "received EAPOL-Key frame (%s)", msgtxt); | |
1041 | ||
1042 | if (key_info & WPA_KEY_INFO_ACK) { | |
1043 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1044 | "received invalid EAPOL-Key: Key Ack set"); | |
1045 | return; | |
1046 | } | |
1047 | ||
1048 | if (!(key_info & WPA_KEY_INFO_MIC)) { | |
1049 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1050 | "received invalid EAPOL-Key: Key MIC not set"); | |
1051 | return; | |
1052 | } | |
1053 | ||
1054 | sm->MICVerified = FALSE; | |
68921e24 | 1055 | if (sm->PTK_valid && !sm->update_snonce) { |
6fc6879b JM |
1056 | if (wpa_verify_key_mic(&sm->PTK, data, data_len)) { |
1057 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1058 | "received EAPOL-Key with invalid MIC"); | |
1059 | return; | |
1060 | } | |
1061 | sm->MICVerified = TRUE; | |
1062 | eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); | |
e4bf4db9 | 1063 | sm->pending_1_of_4_timeout = 0; |
6fc6879b JM |
1064 | } |
1065 | ||
1066 | if (key_info & WPA_KEY_INFO_REQUEST) { | |
1067 | if (sm->MICVerified) { | |
1068 | sm->req_replay_counter_used = 1; | |
1069 | os_memcpy(sm->req_replay_counter, key->replay_counter, | |
1070 | WPA_REPLAY_COUNTER_LEN); | |
1071 | } else { | |
1072 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1073 | "received EAPOL-Key request with " | |
1074 | "invalid MIC"); | |
1075 | return; | |
1076 | } | |
1077 | ||
1078 | /* | |
1079 | * TODO: should decrypt key data field if encryption was used; | |
1080 | * even though MAC address KDE is not normally encrypted, | |
1081 | * supplicant is allowed to encrypt it. | |
1082 | */ | |
1083 | if (msg == SMK_ERROR) { | |
1084 | #ifdef CONFIG_PEERKEY | |
1085 | wpa_smk_error(wpa_auth, sm, key); | |
1086 | #endif /* CONFIG_PEERKEY */ | |
1087 | return; | |
1088 | } else if (key_info & WPA_KEY_INFO_ERROR) { | |
c772d054 JM |
1089 | if (wpa_receive_error_report( |
1090 | wpa_auth, sm, | |
1091 | !(key_info & WPA_KEY_INFO_KEY_TYPE)) > 0) | |
1092 | return; /* STA entry was removed */ | |
6fc6879b JM |
1093 | } else if (key_info & WPA_KEY_INFO_KEY_TYPE) { |
1094 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1095 | "received EAPOL-Key Request for new " | |
1096 | "4-Way Handshake"); | |
1097 | wpa_request_new_ptk(sm); | |
1098 | #ifdef CONFIG_PEERKEY | |
1099 | } else if (msg == SMK_M1) { | |
1100 | wpa_smk_m1(wpa_auth, sm, key); | |
1101 | #endif /* CONFIG_PEERKEY */ | |
1102 | } else if (key_data_length > 0 && | |
1103 | wpa_parse_kde_ies((const u8 *) (key + 1), | |
1104 | key_data_length, &kde) == 0 && | |
1105 | kde.mac_addr) { | |
1106 | } else { | |
1107 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1108 | "received EAPOL-Key Request for GTK " | |
1109 | "rekeying"); | |
6fc6879b JM |
1110 | eloop_cancel_timeout(wpa_rekey_gtk, wpa_auth, NULL); |
1111 | wpa_rekey_gtk(wpa_auth, NULL); | |
1112 | } | |
1113 | } else { | |
68921e24 JM |
1114 | /* Do not allow the same key replay counter to be reused. */ |
1115 | wpa_replay_counter_mark_invalid(sm->key_replay, | |
1116 | key->replay_counter); | |
1117 | ||
1118 | if (msg == PAIRWISE_2) { | |
1119 | /* | |
1120 | * Maintain a copy of the pending EAPOL-Key frames in | |
1121 | * case the EAPOL-Key frame was retransmitted. This is | |
1122 | * needed to allow EAPOL-Key msg 2/4 reply to another | |
1123 | * pending msg 1/4 to update the SNonce to work around | |
1124 | * unexpected supplicant behavior. | |
1125 | */ | |
1126 | os_memcpy(sm->prev_key_replay, sm->key_replay, | |
1127 | sizeof(sm->key_replay)); | |
1128 | } else { | |
1129 | os_memset(sm->prev_key_replay, 0, | |
1130 | sizeof(sm->prev_key_replay)); | |
1131 | } | |
1132 | ||
1133 | /* | |
1134 | * Make sure old valid counters are not accepted anymore and | |
1135 | * do not get copied again. | |
1136 | */ | |
1137 | wpa_replay_counter_mark_invalid(sm->key_replay, NULL); | |
6fc6879b JM |
1138 | } |
1139 | ||
1140 | #ifdef CONFIG_PEERKEY | |
1141 | if (msg == SMK_M3) { | |
1142 | wpa_smk_m3(wpa_auth, sm, key); | |
1143 | return; | |
1144 | } | |
1145 | #endif /* CONFIG_PEERKEY */ | |
1146 | ||
1147 | os_free(sm->last_rx_eapol_key); | |
1148 | sm->last_rx_eapol_key = os_malloc(data_len); | |
1149 | if (sm->last_rx_eapol_key == NULL) | |
1150 | return; | |
1151 | os_memcpy(sm->last_rx_eapol_key, data, data_len); | |
1152 | sm->last_rx_eapol_key_len = data_len; | |
1153 | ||
0d442aff | 1154 | sm->rx_eapol_key_secure = !!(key_info & WPA_KEY_INFO_SECURE); |
6fc6879b JM |
1155 | sm->EAPOLKeyReceived = TRUE; |
1156 | sm->EAPOLKeyPairwise = !!(key_info & WPA_KEY_INFO_KEY_TYPE); | |
1157 | sm->EAPOLKeyRequest = !!(key_info & WPA_KEY_INFO_REQUEST); | |
1158 | os_memcpy(sm->SNonce, key->key_nonce, WPA_NONCE_LEN); | |
1159 | wpa_sm_step(sm); | |
1160 | } | |
1161 | ||
1162 | ||
3c7302c2 JM |
1163 | static int wpa_gmk_to_gtk(const u8 *gmk, const char *label, const u8 *addr, |
1164 | const u8 *gnonce, u8 *gtk, size_t gtk_len) | |
6fc6879b | 1165 | { |
5cb9d5c3 JM |
1166 | u8 data[ETH_ALEN + WPA_NONCE_LEN + 8 + 16]; |
1167 | u8 *pos; | |
3c7302c2 | 1168 | int ret = 0; |
6fc6879b | 1169 | |
5cb9d5c3 JM |
1170 | /* GTK = PRF-X(GMK, "Group key expansion", |
1171 | * AA || GNonce || Time || random data) | |
1172 | * The example described in the IEEE 802.11 standard uses only AA and | |
1173 | * GNonce as inputs here. Add some more entropy since this derivation | |
1174 | * is done only at the Authenticator and as such, does not need to be | |
1175 | * exactly same. | |
1176 | */ | |
6fc6879b JM |
1177 | os_memcpy(data, addr, ETH_ALEN); |
1178 | os_memcpy(data + ETH_ALEN, gnonce, WPA_NONCE_LEN); | |
5cb9d5c3 JM |
1179 | pos = data + ETH_ALEN + WPA_NONCE_LEN; |
1180 | wpa_get_ntp_timestamp(pos); | |
1181 | pos += 8; | |
3642c431 | 1182 | if (random_get_bytes(pos, 16) < 0) |
3c7302c2 | 1183 | ret = -1; |
6fc6879b | 1184 | |
56586197 | 1185 | #ifdef CONFIG_IEEE80211W |
5cb9d5c3 | 1186 | sha256_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len); |
56586197 | 1187 | #else /* CONFIG_IEEE80211W */ |
3c7302c2 JM |
1188 | if (sha1_prf(gmk, WPA_GMK_LEN, label, data, sizeof(data), gtk, gtk_len) |
1189 | < 0) | |
1190 | ret = -1; | |
56586197 | 1191 | #endif /* CONFIG_IEEE80211W */ |
3c7302c2 JM |
1192 | |
1193 | return ret; | |
6fc6879b JM |
1194 | } |
1195 | ||
1196 | ||
1197 | static void wpa_send_eapol_timeout(void *eloop_ctx, void *timeout_ctx) | |
1198 | { | |
1199 | struct wpa_authenticator *wpa_auth = eloop_ctx; | |
1200 | struct wpa_state_machine *sm = timeout_ctx; | |
1201 | ||
e4bf4db9 | 1202 | sm->pending_1_of_4_timeout = 0; |
6fc6879b JM |
1203 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, "EAPOL-Key timeout"); |
1204 | sm->TimeoutEvt = TRUE; | |
1205 | wpa_sm_step(sm); | |
1206 | } | |
1207 | ||
1208 | ||
1209 | void __wpa_send_eapol(struct wpa_authenticator *wpa_auth, | |
1210 | struct wpa_state_machine *sm, int key_info, | |
1211 | const u8 *key_rsc, const u8 *nonce, | |
1212 | const u8 *kde, size_t kde_len, | |
1213 | int keyidx, int encr, int force_version) | |
1214 | { | |
1215 | struct ieee802_1x_hdr *hdr; | |
1216 | struct wpa_eapol_key *key; | |
1217 | size_t len; | |
1218 | int alg; | |
1219 | int key_data_len, pad_len = 0; | |
1220 | u8 *buf, *pos; | |
1221 | int version, pairwise; | |
22a299ee | 1222 | int i; |
6fc6879b JM |
1223 | |
1224 | len = sizeof(struct ieee802_1x_hdr) + sizeof(struct wpa_eapol_key); | |
1225 | ||
1226 | if (force_version) | |
1227 | version = force_version; | |
1228 | else if (wpa_use_aes_cmac(sm)) | |
1229 | version = WPA_KEY_INFO_TYPE_AES_128_CMAC; | |
eb7719ff | 1230 | else if (sm->pairwise != WPA_CIPHER_TKIP) |
6fc6879b JM |
1231 | version = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES; |
1232 | else | |
1233 | version = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4; | |
1234 | ||
1235 | pairwise = key_info & WPA_KEY_INFO_KEY_TYPE; | |
1236 | ||
1237 | wpa_printf(MSG_DEBUG, "WPA: Send EAPOL(version=%d secure=%d mic=%d " | |
1238 | "ack=%d install=%d pairwise=%d kde_len=%lu keyidx=%d " | |
1239 | "encr=%d)", | |
1240 | version, | |
1241 | (key_info & WPA_KEY_INFO_SECURE) ? 1 : 0, | |
1242 | (key_info & WPA_KEY_INFO_MIC) ? 1 : 0, | |
1243 | (key_info & WPA_KEY_INFO_ACK) ? 1 : 0, | |
1244 | (key_info & WPA_KEY_INFO_INSTALL) ? 1 : 0, | |
1245 | pairwise, (unsigned long) kde_len, keyidx, encr); | |
1246 | ||
1247 | key_data_len = kde_len; | |
1248 | ||
1249 | if ((version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || | |
1250 | version == WPA_KEY_INFO_TYPE_AES_128_CMAC) && encr) { | |
1251 | pad_len = key_data_len % 8; | |
1252 | if (pad_len) | |
1253 | pad_len = 8 - pad_len; | |
1254 | key_data_len += pad_len + 8; | |
1255 | } | |
1256 | ||
1257 | len += key_data_len; | |
1258 | ||
1259 | hdr = os_zalloc(len); | |
1260 | if (hdr == NULL) | |
1261 | return; | |
1262 | hdr->version = wpa_auth->conf.eapol_version; | |
1263 | hdr->type = IEEE802_1X_TYPE_EAPOL_KEY; | |
1264 | hdr->length = host_to_be16(len - sizeof(*hdr)); | |
1265 | key = (struct wpa_eapol_key *) (hdr + 1); | |
1266 | ||
1267 | key->type = sm->wpa == WPA_VERSION_WPA2 ? | |
1268 | EAPOL_KEY_TYPE_RSN : EAPOL_KEY_TYPE_WPA; | |
1269 | key_info |= version; | |
1270 | if (encr && sm->wpa == WPA_VERSION_WPA2) | |
1271 | key_info |= WPA_KEY_INFO_ENCR_KEY_DATA; | |
1272 | if (sm->wpa != WPA_VERSION_WPA2) | |
1273 | key_info |= keyidx << WPA_KEY_INFO_KEY_INDEX_SHIFT; | |
1274 | WPA_PUT_BE16(key->key_info, key_info); | |
1275 | ||
1276 | alg = pairwise ? sm->pairwise : wpa_auth->conf.wpa_group; | |
c3550295 | 1277 | WPA_PUT_BE16(key->key_length, wpa_cipher_key_len(alg)); |
6fc6879b JM |
1278 | if (key_info & WPA_KEY_INFO_SMK_MESSAGE) |
1279 | WPA_PUT_BE16(key->key_length, 0); | |
1280 | ||
1281 | /* FIX: STSL: what to use as key_replay_counter? */ | |
22a299ee JM |
1282 | for (i = RSNA_MAX_EAPOL_RETRIES - 1; i > 0; i--) { |
1283 | sm->key_replay[i].valid = sm->key_replay[i - 1].valid; | |
1284 | os_memcpy(sm->key_replay[i].counter, | |
1285 | sm->key_replay[i - 1].counter, | |
1286 | WPA_REPLAY_COUNTER_LEN); | |
1287 | } | |
1288 | inc_byte_array(sm->key_replay[0].counter, WPA_REPLAY_COUNTER_LEN); | |
1289 | os_memcpy(key->replay_counter, sm->key_replay[0].counter, | |
6fc6879b | 1290 | WPA_REPLAY_COUNTER_LEN); |
22a299ee | 1291 | sm->key_replay[0].valid = TRUE; |
6fc6879b JM |
1292 | |
1293 | if (nonce) | |
1294 | os_memcpy(key->key_nonce, nonce, WPA_NONCE_LEN); | |
1295 | ||
1296 | if (key_rsc) | |
1297 | os_memcpy(key->key_rsc, key_rsc, WPA_KEY_RSC_LEN); | |
1298 | ||
1299 | if (kde && !encr) { | |
1300 | os_memcpy(key + 1, kde, kde_len); | |
1301 | WPA_PUT_BE16(key->key_data_length, kde_len); | |
1302 | } else if (encr && kde) { | |
1303 | buf = os_zalloc(key_data_len); | |
1304 | if (buf == NULL) { | |
1305 | os_free(hdr); | |
1306 | return; | |
1307 | } | |
1308 | pos = buf; | |
1309 | os_memcpy(pos, kde, kde_len); | |
1310 | pos += kde_len; | |
1311 | ||
1312 | if (pad_len) | |
1313 | *pos++ = 0xdd; | |
1314 | ||
1315 | wpa_hexdump_key(MSG_DEBUG, "Plaintext EAPOL-Key Key Data", | |
1316 | buf, key_data_len); | |
1317 | if (version == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES || | |
1318 | version == WPA_KEY_INFO_TYPE_AES_128_CMAC) { | |
1319 | if (aes_wrap(sm->PTK.kek, (key_data_len - 8) / 8, buf, | |
1320 | (u8 *) (key + 1))) { | |
1321 | os_free(hdr); | |
1322 | os_free(buf); | |
1323 | return; | |
1324 | } | |
1325 | WPA_PUT_BE16(key->key_data_length, key_data_len); | |
1326 | } else { | |
1327 | u8 ek[32]; | |
1328 | os_memcpy(key->key_iv, | |
1329 | sm->group->Counter + WPA_NONCE_LEN - 16, 16); | |
1330 | inc_byte_array(sm->group->Counter, WPA_NONCE_LEN); | |
1331 | os_memcpy(ek, key->key_iv, 16); | |
1332 | os_memcpy(ek + 16, sm->PTK.kek, 16); | |
1333 | os_memcpy(key + 1, buf, key_data_len); | |
1334 | rc4_skip(ek, 32, 256, (u8 *) (key + 1), key_data_len); | |
1335 | WPA_PUT_BE16(key->key_data_length, key_data_len); | |
1336 | } | |
1337 | os_free(buf); | |
1338 | } | |
1339 | ||
1340 | if (key_info & WPA_KEY_INFO_MIC) { | |
1341 | if (!sm->PTK_valid) { | |
1342 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
1343 | "PTK not valid when sending EAPOL-Key " | |
1344 | "frame"); | |
1345 | os_free(hdr); | |
1346 | return; | |
1347 | } | |
1348 | wpa_eapol_key_mic(sm->PTK.kck, version, (u8 *) hdr, len, | |
1349 | key->key_mic); | |
7af092a0 JB |
1350 | #ifdef CONFIG_TESTING_OPTIONS |
1351 | if (!pairwise && | |
1352 | wpa_auth->conf.corrupt_gtk_rekey_mic_probability > 0.0d && | |
1353 | drand48() < | |
1354 | wpa_auth->conf.corrupt_gtk_rekey_mic_probability) { | |
1355 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_INFO, | |
1356 | "Corrupting group EAPOL-Key Key MIC"); | |
1357 | key->key_mic[0]++; | |
1358 | } | |
1359 | #endif /* CONFIG_TESTING_OPTIONS */ | |
6fc6879b JM |
1360 | } |
1361 | ||
1362 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_inc_EapolFramesTx, | |
1363 | 1); | |
1364 | wpa_auth_send_eapol(wpa_auth, sm->addr, (u8 *) hdr, len, | |
1365 | sm->pairwise_set); | |
1366 | os_free(hdr); | |
1367 | } | |
1368 | ||
1369 | ||
1370 | static void wpa_send_eapol(struct wpa_authenticator *wpa_auth, | |
1371 | struct wpa_state_machine *sm, int key_info, | |
1372 | const u8 *key_rsc, const u8 *nonce, | |
1373 | const u8 *kde, size_t kde_len, | |
1374 | int keyidx, int encr) | |
1375 | { | |
1376 | int timeout_ms; | |
1377 | int pairwise = key_info & WPA_KEY_INFO_KEY_TYPE; | |
bae61562 | 1378 | int ctr; |
6fc6879b JM |
1379 | |
1380 | if (sm == NULL) | |
1381 | return; | |
1382 | ||
1383 | __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len, | |
1384 | keyidx, encr, 0); | |
1385 | ||
bae61562 | 1386 | ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr; |
e4bf4db9 | 1387 | if (ctr == 1 && wpa_auth->conf.tx_status) |
00338a4f JM |
1388 | timeout_ms = pairwise ? eapol_key_timeout_first : |
1389 | eapol_key_timeout_first_group; | |
bae61562 JM |
1390 | else |
1391 | timeout_ms = eapol_key_timeout_subseq; | |
e4bf4db9 JM |
1392 | if (pairwise && ctr == 1 && !(key_info & WPA_KEY_INFO_MIC)) |
1393 | sm->pending_1_of_4_timeout = 1; | |
1394 | wpa_printf(MSG_DEBUG, "WPA: Use EAPOL-Key timeout of %u ms (retry " | |
1395 | "counter %d)", timeout_ms, ctr); | |
6fc6879b JM |
1396 | eloop_register_timeout(timeout_ms / 1000, (timeout_ms % 1000) * 1000, |
1397 | wpa_send_eapol_timeout, wpa_auth, sm); | |
1398 | } | |
1399 | ||
1400 | ||
1401 | static int wpa_verify_key_mic(struct wpa_ptk *PTK, u8 *data, size_t data_len) | |
1402 | { | |
1403 | struct ieee802_1x_hdr *hdr; | |
1404 | struct wpa_eapol_key *key; | |
1405 | u16 key_info; | |
1406 | int ret = 0; | |
1407 | u8 mic[16]; | |
1408 | ||
1409 | if (data_len < sizeof(*hdr) + sizeof(*key)) | |
1410 | return -1; | |
1411 | ||
1412 | hdr = (struct ieee802_1x_hdr *) data; | |
1413 | key = (struct wpa_eapol_key *) (hdr + 1); | |
1414 | key_info = WPA_GET_BE16(key->key_info); | |
1415 | os_memcpy(mic, key->key_mic, 16); | |
1416 | os_memset(key->key_mic, 0, 16); | |
1417 | if (wpa_eapol_key_mic(PTK->kck, key_info & WPA_KEY_INFO_TYPE_MASK, | |
1418 | data, data_len, key->key_mic) || | |
1419 | os_memcmp(mic, key->key_mic, 16) != 0) | |
1420 | ret = -1; | |
1421 | os_memcpy(key->key_mic, mic, 16); | |
1422 | return ret; | |
1423 | } | |
1424 | ||
1425 | ||
1426 | void wpa_remove_ptk(struct wpa_state_machine *sm) | |
1427 | { | |
1428 | sm->PTK_valid = FALSE; | |
1429 | os_memset(&sm->PTK, 0, sizeof(sm->PTK)); | |
26083221 | 1430 | wpa_auth_set_key(sm->wpa_auth, 0, WPA_ALG_NONE, sm->addr, 0, NULL, 0); |
6fc6879b | 1431 | sm->pairwise_set = FALSE; |
581a8cde | 1432 | eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); |
6fc6879b JM |
1433 | } |
1434 | ||
1435 | ||
6f9b5d16 | 1436 | int wpa_auth_sm_event(struct wpa_state_machine *sm, wpa_event event) |
6fc6879b | 1437 | { |
5d22a1d5 JM |
1438 | int remove_ptk = 1; |
1439 | ||
6fc6879b | 1440 | if (sm == NULL) |
6f9b5d16 | 1441 | return -1; |
6fc6879b JM |
1442 | |
1443 | wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
1444 | "event %d notification", event); | |
1445 | ||
1446 | switch (event) { | |
1447 | case WPA_AUTH: | |
1448 | case WPA_ASSOC: | |
1449 | break; | |
1450 | case WPA_DEAUTH: | |
1451 | case WPA_DISASSOC: | |
1452 | sm->DeauthenticationRequest = TRUE; | |
1453 | break; | |
1454 | case WPA_REAUTH: | |
1455 | case WPA_REAUTH_EAPOL: | |
3ab72b62 JM |
1456 | if (!sm->started) { |
1457 | /* | |
1458 | * When using WPS, we may end up here if the STA | |
1459 | * manages to re-associate without the previous STA | |
1460 | * entry getting removed. Consequently, we need to make | |
1461 | * sure that the WPA state machines gets initialized | |
1462 | * properly at this point. | |
1463 | */ | |
1464 | wpa_printf(MSG_DEBUG, "WPA state machine had not been " | |
1465 | "started - initialize now"); | |
1466 | sm->started = 1; | |
1467 | sm->Init = TRUE; | |
1468 | if (wpa_sm_step(sm) == 1) | |
1469 | return 1; /* should not really happen */ | |
1470 | sm->Init = FALSE; | |
1471 | sm->AuthenticationRequest = TRUE; | |
1472 | break; | |
1473 | } | |
9663596f JM |
1474 | if (sm->GUpdateStationKeys) { |
1475 | /* | |
1476 | * Reauthentication cancels the pending group key | |
1477 | * update for this STA. | |
1478 | */ | |
1479 | sm->group->GKeyDoneStations--; | |
1480 | sm->GUpdateStationKeys = FALSE; | |
1481 | sm->PtkGroupInit = TRUE; | |
1482 | } | |
6fc6879b JM |
1483 | sm->ReAuthenticationRequest = TRUE; |
1484 | break; | |
1485 | case WPA_ASSOC_FT: | |
1486 | #ifdef CONFIG_IEEE80211R | |
81a658d7 JM |
1487 | wpa_printf(MSG_DEBUG, "FT: Retry PTK configuration " |
1488 | "after association"); | |
1489 | wpa_ft_install_ptk(sm); | |
1490 | ||
6fc6879b JM |
1491 | /* Using FT protocol, not WPA auth state machine */ |
1492 | sm->ft_completed = 1; | |
6f9b5d16 | 1493 | return 0; |
6fc6879b JM |
1494 | #else /* CONFIG_IEEE80211R */ |
1495 | break; | |
1496 | #endif /* CONFIG_IEEE80211R */ | |
1497 | } | |
1498 | ||
1499 | #ifdef CONFIG_IEEE80211R | |
1500 | sm->ft_completed = 0; | |
1501 | #endif /* CONFIG_IEEE80211R */ | |
1502 | ||
5d22a1d5 JM |
1503 | #ifdef CONFIG_IEEE80211W |
1504 | if (sm->mgmt_frame_prot && event == WPA_AUTH) | |
1505 | remove_ptk = 0; | |
1506 | #endif /* CONFIG_IEEE80211W */ | |
6fc6879b | 1507 | |
5d22a1d5 JM |
1508 | if (remove_ptk) { |
1509 | sm->PTK_valid = FALSE; | |
1510 | os_memset(&sm->PTK, 0, sizeof(sm->PTK)); | |
1511 | ||
1512 | if (event != WPA_REAUTH_EAPOL) | |
1513 | wpa_remove_ptk(sm); | |
1514 | } | |
6fc6879b | 1515 | |
6f9b5d16 | 1516 | return wpa_sm_step(sm); |
6fc6879b JM |
1517 | } |
1518 | ||
1519 | ||
6fc6879b JM |
1520 | SM_STATE(WPA_PTK, INITIALIZE) |
1521 | { | |
1522 | SM_ENTRY_MA(WPA_PTK, INITIALIZE, wpa_ptk); | |
1523 | if (sm->Init) { | |
1524 | /* Init flag is not cleared here, so avoid busy | |
1525 | * loop by claiming nothing changed. */ | |
1526 | sm->changed = FALSE; | |
1527 | } | |
1528 | ||
1529 | sm->keycount = 0; | |
1530 | if (sm->GUpdateStationKeys) | |
1531 | sm->group->GKeyDoneStations--; | |
1532 | sm->GUpdateStationKeys = FALSE; | |
1533 | if (sm->wpa == WPA_VERSION_WPA) | |
1534 | sm->PInitAKeys = FALSE; | |
1535 | if (1 /* Unicast cipher supported AND (ESS OR ((IBSS or WDS) and | |
1536 | * Local AA > Remote AA)) */) { | |
1537 | sm->Pair = TRUE; | |
1538 | } | |
1539 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 0); | |
1540 | wpa_remove_ptk(sm); | |
1541 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, 0); | |
1542 | sm->TimeoutCtr = 0; | |
56586197 | 1543 | if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { |
6fc6879b JM |
1544 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, |
1545 | WPA_EAPOL_authorized, 0); | |
1546 | } | |
1547 | } | |
1548 | ||
1549 | ||
1550 | SM_STATE(WPA_PTK, DISCONNECT) | |
1551 | { | |
1552 | SM_ENTRY_MA(WPA_PTK, DISCONNECT, wpa_ptk); | |
1553 | sm->Disconnect = FALSE; | |
1554 | wpa_sta_disconnect(sm->wpa_auth, sm->addr); | |
1555 | } | |
1556 | ||
1557 | ||
1558 | SM_STATE(WPA_PTK, DISCONNECTED) | |
1559 | { | |
1560 | SM_ENTRY_MA(WPA_PTK, DISCONNECTED, wpa_ptk); | |
1561 | sm->DeauthenticationRequest = FALSE; | |
1562 | } | |
1563 | ||
1564 | ||
1565 | SM_STATE(WPA_PTK, AUTHENTICATION) | |
1566 | { | |
1567 | SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk); | |
1568 | os_memset(&sm->PTK, 0, sizeof(sm->PTK)); | |
1569 | sm->PTK_valid = FALSE; | |
1570 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portControl_Auto, | |
1571 | 1); | |
1572 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portEnabled, 1); | |
1573 | sm->AuthenticationRequest = FALSE; | |
1574 | } | |
1575 | ||
1576 | ||
40d00d2b NC |
1577 | static void wpa_group_ensure_init(struct wpa_authenticator *wpa_auth, |
1578 | struct wpa_group *group) | |
1bdb7ab3 | 1579 | { |
40d00d2b NC |
1580 | if (group->first_sta_seen) |
1581 | return; | |
1bdb7ab3 JM |
1582 | /* |
1583 | * System has run bit further than at the time hostapd was started | |
1584 | * potentially very early during boot up. This provides better chances | |
1585 | * of collecting more randomness on embedded systems. Re-initialize the | |
1586 | * GMK and Counter here to improve their strength if there was not | |
1587 | * enough entropy available immediately after system startup. | |
1588 | */ | |
1589 | wpa_printf(MSG_DEBUG, "WPA: Re-initialize GMK/Counter on first " | |
1590 | "station"); | |
08704cd8 JM |
1591 | if (random_pool_ready() != 1) { |
1592 | wpa_printf(MSG_INFO, "WPA: Not enough entropy in random pool " | |
1593 | "to proceed - reject first 4-way handshake"); | |
1594 | group->reject_4way_hs_for_entropy = TRUE; | |
40d00d2b NC |
1595 | } else { |
1596 | group->first_sta_seen = TRUE; | |
1597 | group->reject_4way_hs_for_entropy = FALSE; | |
08704cd8 | 1598 | } |
40d00d2b | 1599 | |
1bdb7ab3 JM |
1600 | wpa_group_init_gmk_and_counter(wpa_auth, group); |
1601 | wpa_gtk_update(wpa_auth, group); | |
1602 | wpa_group_config_group_keys(wpa_auth, group); | |
1603 | } | |
1604 | ||
1605 | ||
6fc6879b JM |
1606 | SM_STATE(WPA_PTK, AUTHENTICATION2) |
1607 | { | |
1608 | SM_ENTRY_MA(WPA_PTK, AUTHENTICATION2, wpa_ptk); | |
1bdb7ab3 | 1609 | |
40d00d2b | 1610 | wpa_group_ensure_init(sm->wpa_auth, sm->group); |
65a32cdb | 1611 | sm->ReAuthenticationRequest = FALSE; |
1bdb7ab3 | 1612 | |
3825a19b JM |
1613 | /* |
1614 | * Definition of ANonce selection in IEEE Std 802.11i-2004 is somewhat | |
1615 | * ambiguous. The Authenticator state machine uses a counter that is | |
1616 | * incremented by one for each 4-way handshake. However, the security | |
1617 | * analysis of 4-way handshake points out that unpredictable nonces | |
1618 | * help in preventing precomputation attacks. Instead of the state | |
1619 | * machine definition, use an unpredictable nonce value here to provide | |
1620 | * stronger protection against potential precomputation attacks. | |
1621 | */ | |
1622 | if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) { | |
1623 | wpa_printf(MSG_ERROR, "WPA: Failed to get random data for " | |
1624 | "ANonce."); | |
65a32cdb | 1625 | sm->Disconnect = TRUE; |
3825a19b JM |
1626 | return; |
1627 | } | |
bc8318ac JM |
1628 | wpa_hexdump(MSG_DEBUG, "WPA: Assign ANonce", sm->ANonce, |
1629 | WPA_NONCE_LEN); | |
6fc6879b JM |
1630 | /* IEEE 802.11i does not clear TimeoutCtr here, but this is more |
1631 | * logical place than INITIALIZE since AUTHENTICATION2 can be | |
1632 | * re-entered on ReAuthenticationRequest without going through | |
1633 | * INITIALIZE. */ | |
1634 | sm->TimeoutCtr = 0; | |
1635 | } | |
1636 | ||
1637 | ||
1638 | SM_STATE(WPA_PTK, INITPMK) | |
1639 | { | |
1640 | u8 msk[2 * PMK_LEN]; | |
1641 | size_t len = 2 * PMK_LEN; | |
1642 | ||
1643 | SM_ENTRY_MA(WPA_PTK, INITPMK, wpa_ptk); | |
1644 | #ifdef CONFIG_IEEE80211R | |
1645 | sm->xxkey_len = 0; | |
1646 | #endif /* CONFIG_IEEE80211R */ | |
1647 | if (sm->pmksa) { | |
1648 | wpa_printf(MSG_DEBUG, "WPA: PMK from PMKSA cache"); | |
1649 | os_memcpy(sm->PMK, sm->pmksa->pmk, PMK_LEN); | |
1650 | } else if (wpa_auth_get_msk(sm->wpa_auth, sm->addr, msk, &len) == 0) { | |
1651 | wpa_printf(MSG_DEBUG, "WPA: PMK from EAPOL state machine " | |
1652 | "(len=%lu)", (unsigned long) len); | |
1653 | os_memcpy(sm->PMK, msk, PMK_LEN); | |
1654 | #ifdef CONFIG_IEEE80211R | |
1655 | if (len >= 2 * PMK_LEN) { | |
1656 | os_memcpy(sm->xxkey, msk + PMK_LEN, PMK_LEN); | |
1657 | sm->xxkey_len = PMK_LEN; | |
1658 | } | |
1659 | #endif /* CONFIG_IEEE80211R */ | |
1660 | } else { | |
1661 | wpa_printf(MSG_DEBUG, "WPA: Could not get PMK"); | |
1662 | } | |
1663 | ||
1664 | sm->req_replay_counter_used = 0; | |
1665 | /* IEEE 802.11i does not set keyRun to FALSE, but not doing this | |
1666 | * will break reauthentication since EAPOL state machines may not be | |
1667 | * get into AUTHENTICATING state that clears keyRun before WPA state | |
1668 | * machine enters AUTHENTICATION2 state and goes immediately to INITPMK | |
1669 | * state and takes PMK from the previously used AAA Key. This will | |
1670 | * eventually fail in 4-Way Handshake because Supplicant uses PMK | |
1671 | * derived from the new AAA Key. Setting keyRun = FALSE here seems to | |
1672 | * be good workaround for this issue. */ | |
1673 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyRun, 0); | |
1674 | } | |
1675 | ||
1676 | ||
1677 | SM_STATE(WPA_PTK, INITPSK) | |
1678 | { | |
1679 | const u8 *psk; | |
1680 | SM_ENTRY_MA(WPA_PTK, INITPSK, wpa_ptk); | |
1681 | psk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL); | |
1682 | if (psk) { | |
1683 | os_memcpy(sm->PMK, psk, PMK_LEN); | |
1684 | #ifdef CONFIG_IEEE80211R | |
1685 | os_memcpy(sm->xxkey, psk, PMK_LEN); | |
1686 | sm->xxkey_len = PMK_LEN; | |
1687 | #endif /* CONFIG_IEEE80211R */ | |
1688 | } | |
1689 | sm->req_replay_counter_used = 0; | |
1690 | } | |
1691 | ||
1692 | ||
1693 | SM_STATE(WPA_PTK, PTKSTART) | |
1694 | { | |
1695 | u8 buf[2 + RSN_SELECTOR_LEN + PMKID_LEN], *pmkid = NULL; | |
1696 | size_t pmkid_len = 0; | |
1697 | ||
1698 | SM_ENTRY_MA(WPA_PTK, PTKSTART, wpa_ptk); | |
1699 | sm->PTKRequest = FALSE; | |
1700 | sm->TimeoutEvt = FALSE; | |
bae61562 JM |
1701 | |
1702 | sm->TimeoutCtr++; | |
1703 | if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { | |
1704 | /* No point in sending the EAPOL-Key - we will disconnect | |
1705 | * immediately following this. */ | |
1706 | return; | |
1707 | } | |
1708 | ||
6fc6879b JM |
1709 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, |
1710 | "sending 1/4 msg of 4-Way Handshake"); | |
1711 | /* | |
1712 | * TODO: Could add PMKID even with WPA2-PSK, but only if there is only | |
1713 | * one possible PSK for this STA. | |
1714 | */ | |
1715 | if (sm->wpa == WPA_VERSION_WPA2 && | |
56586197 | 1716 | wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt)) { |
6fc6879b JM |
1717 | pmkid = buf; |
1718 | pmkid_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN; | |
1719 | pmkid[0] = WLAN_EID_VENDOR_SPECIFIC; | |
1720 | pmkid[1] = RSN_SELECTOR_LEN + PMKID_LEN; | |
1721 | RSN_SELECTOR_PUT(&pmkid[2], RSN_KEY_DATA_PMKID); | |
1722 | if (sm->pmksa) | |
1723 | os_memcpy(&pmkid[2 + RSN_SELECTOR_LEN], | |
1724 | sm->pmksa->pmkid, PMKID_LEN); | |
1725 | else { | |
1726 | /* | |
1727 | * Calculate PMKID since no PMKSA cache entry was | |
1728 | * available with pre-calculated PMKID. | |
1729 | */ | |
1730 | rsn_pmkid(sm->PMK, PMK_LEN, sm->wpa_auth->addr, | |
56586197 JM |
1731 | sm->addr, &pmkid[2 + RSN_SELECTOR_LEN], |
1732 | wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); | |
6fc6879b JM |
1733 | } |
1734 | } | |
1735 | wpa_send_eapol(sm->wpa_auth, sm, | |
1736 | WPA_KEY_INFO_ACK | WPA_KEY_INFO_KEY_TYPE, NULL, | |
1737 | sm->ANonce, pmkid, pmkid_len, 0, 0); | |
6fc6879b JM |
1738 | } |
1739 | ||
1740 | ||
1741 | static int wpa_derive_ptk(struct wpa_state_machine *sm, const u8 *pmk, | |
1742 | struct wpa_ptk *ptk) | |
1743 | { | |
eb7719ff | 1744 | size_t ptk_len = sm->pairwise != WPA_CIPHER_TKIP ? 48 : 64; |
6fc6879b | 1745 | #ifdef CONFIG_IEEE80211R |
56586197 | 1746 | if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) |
c0a61908 | 1747 | return wpa_auth_derive_ptk_ft(sm, pmk, ptk, ptk_len); |
6fc6879b JM |
1748 | #endif /* CONFIG_IEEE80211R */ |
1749 | ||
1750 | wpa_pmk_to_ptk(pmk, PMK_LEN, "Pairwise key expansion", | |
1751 | sm->wpa_auth->addr, sm->addr, sm->ANonce, sm->SNonce, | |
c0a61908 | 1752 | (u8 *) ptk, ptk_len, |
56586197 | 1753 | wpa_key_mgmt_sha256(sm->wpa_key_mgmt)); |
6fc6879b JM |
1754 | |
1755 | return 0; | |
1756 | } | |
1757 | ||
1758 | ||
1759 | SM_STATE(WPA_PTK, PTKCALCNEGOTIATING) | |
1760 | { | |
1761 | struct wpa_ptk PTK; | |
1762 | int ok = 0; | |
1763 | const u8 *pmk = NULL; | |
1764 | ||
1765 | SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING, wpa_ptk); | |
1766 | sm->EAPOLKeyReceived = FALSE; | |
68921e24 | 1767 | sm->update_snonce = FALSE; |
6fc6879b JM |
1768 | |
1769 | /* WPA with IEEE 802.1X: use the derived PMK from EAP | |
1770 | * WPA-PSK: iterate through possible PSKs and select the one matching | |
1771 | * the packet */ | |
1772 | for (;;) { | |
56586197 | 1773 | if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { |
6fc6879b JM |
1774 | pmk = wpa_auth_get_psk(sm->wpa_auth, sm->addr, pmk); |
1775 | if (pmk == NULL) | |
1776 | break; | |
1777 | } else | |
1778 | pmk = sm->PMK; | |
1779 | ||
1780 | wpa_derive_ptk(sm, pmk, &PTK); | |
1781 | ||
1782 | if (wpa_verify_key_mic(&PTK, sm->last_rx_eapol_key, | |
1783 | sm->last_rx_eapol_key_len) == 0) { | |
1784 | ok = 1; | |
1785 | break; | |
1786 | } | |
1787 | ||
56586197 | 1788 | if (!wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) |
6fc6879b JM |
1789 | break; |
1790 | } | |
1791 | ||
1792 | if (!ok) { | |
1793 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
1794 | "invalid MIC in msg 2/4 of 4-Way Handshake"); | |
1795 | return; | |
1796 | } | |
1797 | ||
26e23750 JM |
1798 | #ifdef CONFIG_IEEE80211R |
1799 | if (sm->wpa == WPA_VERSION_WPA2 && wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { | |
1800 | /* | |
1801 | * Verify that PMKR1Name from EAPOL-Key message 2/4 matches | |
1802 | * with the value we derived. | |
1803 | */ | |
1804 | if (os_memcmp(sm->sup_pmk_r1_name, sm->pmk_r1_name, | |
1805 | WPA_PMK_NAME_LEN) != 0) { | |
1806 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
1807 | "PMKR1Name mismatch in FT 4-way " | |
1808 | "handshake"); | |
1809 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name from " | |
1810 | "Supplicant", | |
1811 | sm->sup_pmk_r1_name, WPA_PMK_NAME_LEN); | |
1812 | wpa_hexdump(MSG_DEBUG, "FT: Derived PMKR1Name", | |
1813 | sm->pmk_r1_name, WPA_PMK_NAME_LEN); | |
1814 | return; | |
1815 | } | |
1816 | } | |
1817 | #endif /* CONFIG_IEEE80211R */ | |
1818 | ||
e4bf4db9 | 1819 | sm->pending_1_of_4_timeout = 0; |
6fc6879b JM |
1820 | eloop_cancel_timeout(wpa_send_eapol_timeout, sm->wpa_auth, sm); |
1821 | ||
56586197 | 1822 | if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { |
6fc6879b JM |
1823 | /* PSK may have changed from the previous choice, so update |
1824 | * state machine data based on whatever PSK was selected here. | |
1825 | */ | |
1826 | os_memcpy(sm->PMK, pmk, PMK_LEN); | |
1827 | } | |
1828 | ||
1829 | sm->MICVerified = TRUE; | |
1830 | ||
1831 | os_memcpy(&sm->PTK, &PTK, sizeof(PTK)); | |
1832 | sm->PTK_valid = TRUE; | |
1833 | } | |
1834 | ||
1835 | ||
1836 | SM_STATE(WPA_PTK, PTKCALCNEGOTIATING2) | |
1837 | { | |
1838 | SM_ENTRY_MA(WPA_PTK, PTKCALCNEGOTIATING2, wpa_ptk); | |
1839 | sm->TimeoutCtr = 0; | |
1840 | } | |
1841 | ||
1842 | ||
1843 | #ifdef CONFIG_IEEE80211W | |
1844 | ||
1845 | static int ieee80211w_kde_len(struct wpa_state_machine *sm) | |
1846 | { | |
1847 | if (sm->mgmt_frame_prot) { | |
1848 | return 2 + RSN_SELECTOR_LEN + sizeof(struct wpa_igtk_kde); | |
1849 | } | |
1850 | ||
1851 | return 0; | |
1852 | } | |
1853 | ||
1854 | ||
1855 | static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) | |
1856 | { | |
1857 | struct wpa_igtk_kde igtk; | |
1858 | struct wpa_group *gsm = sm->group; | |
1859 | ||
1860 | if (!sm->mgmt_frame_prot) | |
1861 | return pos; | |
1862 | ||
1863 | igtk.keyid[0] = gsm->GN_igtk; | |
1864 | igtk.keyid[1] = 0; | |
7b1080da JM |
1865 | if (gsm->wpa_group_state != WPA_GROUP_SETKEYSDONE || |
1866 | wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, igtk.pn) < 0) | |
6fc6879b JM |
1867 | os_memset(igtk.pn, 0, sizeof(igtk.pn)); |
1868 | os_memcpy(igtk.igtk, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); | |
83421850 JM |
1869 | if (sm->wpa_auth->conf.disable_gtk) { |
1870 | /* | |
1871 | * Provide unique random IGTK to each STA to prevent use of | |
1872 | * IGTK in the BSS. | |
1873 | */ | |
1874 | if (random_get_bytes(igtk.igtk, WPA_IGTK_LEN) < 0) | |
1875 | return pos; | |
1876 | } | |
6fc6879b JM |
1877 | pos = wpa_add_kde(pos, RSN_KEY_DATA_IGTK, |
1878 | (const u8 *) &igtk, sizeof(igtk), NULL, 0); | |
1879 | ||
1880 | return pos; | |
1881 | } | |
1882 | ||
1883 | #else /* CONFIG_IEEE80211W */ | |
1884 | ||
1885 | static int ieee80211w_kde_len(struct wpa_state_machine *sm) | |
1886 | { | |
1887 | return 0; | |
1888 | } | |
1889 | ||
1890 | ||
1891 | static u8 * ieee80211w_kde_add(struct wpa_state_machine *sm, u8 *pos) | |
1892 | { | |
1893 | return pos; | |
1894 | } | |
1895 | ||
1896 | #endif /* CONFIG_IEEE80211W */ | |
1897 | ||
1898 | ||
1899 | SM_STATE(WPA_PTK, PTKINITNEGOTIATING) | |
1900 | { | |
83421850 | 1901 | u8 rsc[WPA_KEY_RSC_LEN], *_rsc, *gtk, *kde, *pos, dummy_gtk[32]; |
6fc6879b JM |
1902 | size_t gtk_len, kde_len; |
1903 | struct wpa_group *gsm = sm->group; | |
1904 | u8 *wpa_ie; | |
1905 | int wpa_ie_len, secure, keyidx, encr = 0; | |
1906 | ||
1907 | SM_ENTRY_MA(WPA_PTK, PTKINITNEGOTIATING, wpa_ptk); | |
1908 | sm->TimeoutEvt = FALSE; | |
bae61562 JM |
1909 | |
1910 | sm->TimeoutCtr++; | |
1911 | if (sm->TimeoutCtr > (int) dot11RSNAConfigPairwiseUpdateCount) { | |
1912 | /* No point in sending the EAPOL-Key - we will disconnect | |
1913 | * immediately following this. */ | |
1914 | return; | |
1915 | } | |
1916 | ||
86dfabb8 JM |
1917 | /* Send EAPOL(1, 1, 1, Pair, P, RSC, ANonce, MIC(PTK), RSNIE, [MDIE], |
1918 | GTK[GN], IGTK, [FTIE], [TIE * 2]) | |
6fc6879b JM |
1919 | */ |
1920 | os_memset(rsc, 0, WPA_KEY_RSC_LEN); | |
1921 | wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); | |
86dfabb8 | 1922 | /* If FT is used, wpa_auth->wpa_ie includes both RSNIE and MDIE */ |
6fc6879b JM |
1923 | wpa_ie = sm->wpa_auth->wpa_ie; |
1924 | wpa_ie_len = sm->wpa_auth->wpa_ie_len; | |
1925 | if (sm->wpa == WPA_VERSION_WPA && | |
1926 | (sm->wpa_auth->conf.wpa & WPA_PROTO_RSN) && | |
1927 | wpa_ie_len > wpa_ie[1] + 2 && wpa_ie[0] == WLAN_EID_RSN) { | |
1928 | /* WPA-only STA, remove RSN IE */ | |
1929 | wpa_ie = wpa_ie + wpa_ie[1] + 2; | |
1930 | wpa_ie_len = wpa_ie[1] + 2; | |
1931 | } | |
1932 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
1933 | "sending 3/4 msg of 4-Way Handshake"); | |
1934 | if (sm->wpa == WPA_VERSION_WPA2) { | |
1935 | /* WPA2 send GTK in the 4-way handshake */ | |
1936 | secure = 1; | |
1937 | gtk = gsm->GTK[gsm->GN - 1]; | |
1938 | gtk_len = gsm->GTK_len; | |
83421850 JM |
1939 | if (sm->wpa_auth->conf.disable_gtk) { |
1940 | /* | |
1941 | * Provide unique random GTK to each STA to prevent use | |
1942 | * of GTK in the BSS. | |
1943 | */ | |
1944 | if (random_get_bytes(dummy_gtk, gtk_len) < 0) | |
1945 | return; | |
1946 | gtk = dummy_gtk; | |
1947 | } | |
6fc6879b JM |
1948 | keyidx = gsm->GN; |
1949 | _rsc = rsc; | |
1950 | encr = 1; | |
1951 | } else { | |
1952 | /* WPA does not include GTK in msg 3/4 */ | |
1953 | secure = 0; | |
1954 | gtk = NULL; | |
1955 | gtk_len = 0; | |
1956 | keyidx = 0; | |
1957 | _rsc = NULL; | |
0d442aff JM |
1958 | if (sm->rx_eapol_key_secure) { |
1959 | /* | |
1960 | * It looks like Windows 7 supplicant tries to use | |
1961 | * Secure bit in msg 2/4 after having reported Michael | |
1962 | * MIC failure and it then rejects the 4-way handshake | |
1963 | * if msg 3/4 does not set Secure bit. Work around this | |
1964 | * by setting the Secure bit here even in the case of | |
1965 | * WPA if the supplicant used it first. | |
1966 | */ | |
1967 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
4740d5b9 JM |
1968 | "STA used Secure bit in WPA msg 2/4 - " |
1969 | "set Secure for 3/4 as workaround"); | |
0d442aff JM |
1970 | secure = 1; |
1971 | } | |
6fc6879b JM |
1972 | } |
1973 | ||
1974 | kde_len = wpa_ie_len + ieee80211w_kde_len(sm); | |
1975 | if (gtk) | |
1976 | kde_len += 2 + RSN_SELECTOR_LEN + 2 + gtk_len; | |
26e23750 | 1977 | #ifdef CONFIG_IEEE80211R |
86dfabb8 JM |
1978 | if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { |
1979 | kde_len += 2 + PMKID_LEN; /* PMKR1Name into RSN IE */ | |
1980 | kde_len += 300; /* FTIE + 2 * TIE */ | |
1981 | } | |
26e23750 | 1982 | #endif /* CONFIG_IEEE80211R */ |
6fc6879b JM |
1983 | kde = os_malloc(kde_len); |
1984 | if (kde == NULL) | |
1985 | return; | |
1986 | ||
1987 | pos = kde; | |
1988 | os_memcpy(pos, wpa_ie, wpa_ie_len); | |
1989 | pos += wpa_ie_len; | |
26e23750 JM |
1990 | #ifdef CONFIG_IEEE80211R |
1991 | if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { | |
1992 | int res = wpa_insert_pmkid(kde, pos - kde, sm->pmk_r1_name); | |
1993 | if (res < 0) { | |
1994 | wpa_printf(MSG_ERROR, "FT: Failed to insert " | |
1995 | "PMKR1Name into RSN IE in EAPOL-Key data"); | |
1996 | os_free(kde); | |
1997 | return; | |
1998 | } | |
1999 | pos += res; | |
2000 | } | |
2001 | #endif /* CONFIG_IEEE80211R */ | |
6fc6879b JM |
2002 | if (gtk) { |
2003 | u8 hdr[2]; | |
2004 | hdr[0] = keyidx & 0x03; | |
2005 | hdr[1] = 0; | |
2006 | pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, | |
2007 | gtk, gtk_len); | |
2008 | } | |
2009 | pos = ieee80211w_kde_add(sm, pos); | |
2010 | ||
86dfabb8 JM |
2011 | #ifdef CONFIG_IEEE80211R |
2012 | if (wpa_key_mgmt_ft(sm->wpa_key_mgmt)) { | |
2013 | int res; | |
2014 | struct wpa_auth_config *conf; | |
2015 | ||
2016 | conf = &sm->wpa_auth->conf; | |
2017 | res = wpa_write_ftie(conf, conf->r0_key_holder, | |
2018 | conf->r0_key_holder_len, | |
2019 | NULL, NULL, pos, kde + kde_len - pos, | |
2020 | NULL, 0); | |
2021 | if (res < 0) { | |
2022 | wpa_printf(MSG_ERROR, "FT: Failed to insert FTIE " | |
2023 | "into EAPOL-Key Key Data"); | |
2024 | os_free(kde); | |
2025 | return; | |
2026 | } | |
2027 | pos += res; | |
2028 | ||
2029 | /* TIE[ReassociationDeadline] (TU) */ | |
2030 | *pos++ = WLAN_EID_TIMEOUT_INTERVAL; | |
2031 | *pos++ = 5; | |
2032 | *pos++ = WLAN_TIMEOUT_REASSOC_DEADLINE; | |
2033 | WPA_PUT_LE32(pos, conf->reassociation_deadline); | |
2034 | pos += 4; | |
2035 | ||
2036 | /* TIE[KeyLifetime] (seconds) */ | |
2037 | *pos++ = WLAN_EID_TIMEOUT_INTERVAL; | |
2038 | *pos++ = 5; | |
2039 | *pos++ = WLAN_TIMEOUT_KEY_LIFETIME; | |
2040 | WPA_PUT_LE32(pos, conf->r0_key_lifetime * 60); | |
2041 | pos += 4; | |
2042 | } | |
2043 | #endif /* CONFIG_IEEE80211R */ | |
2044 | ||
6fc6879b JM |
2045 | wpa_send_eapol(sm->wpa_auth, sm, |
2046 | (secure ? WPA_KEY_INFO_SECURE : 0) | WPA_KEY_INFO_MIC | | |
2047 | WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL | | |
2048 | WPA_KEY_INFO_KEY_TYPE, | |
2049 | _rsc, sm->ANonce, kde, pos - kde, keyidx, encr); | |
2050 | os_free(kde); | |
6fc6879b JM |
2051 | } |
2052 | ||
2053 | ||
2054 | SM_STATE(WPA_PTK, PTKINITDONE) | |
2055 | { | |
2056 | SM_ENTRY_MA(WPA_PTK, PTKINITDONE, wpa_ptk); | |
2057 | sm->EAPOLKeyReceived = FALSE; | |
2058 | if (sm->Pair) { | |
c3550295 JM |
2059 | enum wpa_alg alg = wpa_cipher_to_alg(sm->pairwise); |
2060 | int klen = wpa_cipher_key_len(sm->pairwise); | |
6fc6879b JM |
2061 | if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, |
2062 | sm->PTK.tk1, klen)) { | |
2063 | wpa_sta_disconnect(sm->wpa_auth, sm->addr); | |
2064 | return; | |
2065 | } | |
2066 | /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ | |
2067 | sm->pairwise_set = TRUE; | |
2068 | ||
581a8cde JM |
2069 | if (sm->wpa_auth->conf.wpa_ptk_rekey) { |
2070 | eloop_cancel_timeout(wpa_rekey_ptk, sm->wpa_auth, sm); | |
2071 | eloop_register_timeout(sm->wpa_auth->conf. | |
2072 | wpa_ptk_rekey, 0, wpa_rekey_ptk, | |
2073 | sm->wpa_auth, sm); | |
2074 | } | |
2075 | ||
56586197 | 2076 | if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt)) { |
6fc6879b JM |
2077 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, |
2078 | WPA_EAPOL_authorized, 1); | |
2079 | } | |
2080 | } | |
2081 | ||
2082 | if (0 /* IBSS == TRUE */) { | |
2083 | sm->keycount++; | |
2084 | if (sm->keycount == 2) { | |
2085 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, | |
2086 | WPA_EAPOL_portValid, 1); | |
2087 | } | |
2088 | } else { | |
2089 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_portValid, | |
2090 | 1); | |
2091 | } | |
2092 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyAvailable, 0); | |
2093 | wpa_auth_set_eapol(sm->wpa_auth, sm->addr, WPA_EAPOL_keyDone, 1); | |
2094 | if (sm->wpa == WPA_VERSION_WPA) | |
2095 | sm->PInitAKeys = TRUE; | |
2096 | else | |
2097 | sm->has_GTK = TRUE; | |
2098 | wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, | |
2099 | "pairwise key handshake completed (%s)", | |
2100 | sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); | |
2101 | ||
2102 | #ifdef CONFIG_IEEE80211R | |
2103 | wpa_ft_push_pmk_r1(sm->wpa_auth, sm->addr); | |
2104 | #endif /* CONFIG_IEEE80211R */ | |
2105 | } | |
2106 | ||
2107 | ||
2108 | SM_STEP(WPA_PTK) | |
2109 | { | |
2110 | struct wpa_authenticator *wpa_auth = sm->wpa_auth; | |
2111 | ||
2112 | if (sm->Init) | |
2113 | SM_ENTER(WPA_PTK, INITIALIZE); | |
2114 | else if (sm->Disconnect | |
1aae01fc BG |
2115 | /* || FIX: dot11RSNAConfigSALifetime timeout */) { |
2116 | wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG, | |
2117 | "WPA_PTK: sm->Disconnect"); | |
6fc6879b | 2118 | SM_ENTER(WPA_PTK, DISCONNECT); |
1aae01fc | 2119 | } |
6fc6879b JM |
2120 | else if (sm->DeauthenticationRequest) |
2121 | SM_ENTER(WPA_PTK, DISCONNECTED); | |
2122 | else if (sm->AuthenticationRequest) | |
2123 | SM_ENTER(WPA_PTK, AUTHENTICATION); | |
2124 | else if (sm->ReAuthenticationRequest) | |
2125 | SM_ENTER(WPA_PTK, AUTHENTICATION2); | |
2126 | else if (sm->PTKRequest) | |
2127 | SM_ENTER(WPA_PTK, PTKSTART); | |
2128 | else switch (sm->wpa_ptk_state) { | |
2129 | case WPA_PTK_INITIALIZE: | |
2130 | break; | |
2131 | case WPA_PTK_DISCONNECT: | |
2132 | SM_ENTER(WPA_PTK, DISCONNECTED); | |
2133 | break; | |
2134 | case WPA_PTK_DISCONNECTED: | |
2135 | SM_ENTER(WPA_PTK, INITIALIZE); | |
2136 | break; | |
2137 | case WPA_PTK_AUTHENTICATION: | |
2138 | SM_ENTER(WPA_PTK, AUTHENTICATION2); | |
2139 | break; | |
2140 | case WPA_PTK_AUTHENTICATION2: | |
56586197 | 2141 | if (wpa_key_mgmt_wpa_ieee8021x(sm->wpa_key_mgmt) && |
6fc6879b JM |
2142 | wpa_auth_get_eapol(sm->wpa_auth, sm->addr, |
2143 | WPA_EAPOL_keyRun) > 0) | |
2144 | SM_ENTER(WPA_PTK, INITPMK); | |
56586197 | 2145 | else if (wpa_key_mgmt_wpa_psk(sm->wpa_key_mgmt) |
6fc6879b JM |
2146 | /* FIX: && 802.1X::keyRun */) |
2147 | SM_ENTER(WPA_PTK, INITPSK); | |
2148 | break; | |
2149 | case WPA_PTK_INITPMK: | |
2150 | if (wpa_auth_get_eapol(sm->wpa_auth, sm->addr, | |
2151 | WPA_EAPOL_keyAvailable) > 0) | |
2152 | SM_ENTER(WPA_PTK, PTKSTART); | |
2153 | else { | |
2154 | wpa_auth->dot11RSNA4WayHandshakeFailures++; | |
1aae01fc BG |
2155 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, |
2156 | "INITPMK - keyAvailable = false"); | |
6fc6879b JM |
2157 | SM_ENTER(WPA_PTK, DISCONNECT); |
2158 | } | |
2159 | break; | |
2160 | case WPA_PTK_INITPSK: | |
2161 | if (wpa_auth_get_psk(sm->wpa_auth, sm->addr, NULL)) | |
2162 | SM_ENTER(WPA_PTK, PTKSTART); | |
2163 | else { | |
2164 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_INFO, | |
2165 | "no PSK configured for the STA"); | |
2166 | wpa_auth->dot11RSNA4WayHandshakeFailures++; | |
2167 | SM_ENTER(WPA_PTK, DISCONNECT); | |
2168 | } | |
2169 | break; | |
2170 | case WPA_PTK_PTKSTART: | |
2171 | if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && | |
2172 | sm->EAPOLKeyPairwise) | |
2173 | SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); | |
2174 | else if (sm->TimeoutCtr > | |
2175 | (int) dot11RSNAConfigPairwiseUpdateCount) { | |
2176 | wpa_auth->dot11RSNA4WayHandshakeFailures++; | |
1aae01fc BG |
2177 | wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, |
2178 | "PTKSTART: Retry limit %d reached", | |
2179 | dot11RSNAConfigPairwiseUpdateCount); | |
6fc6879b JM |
2180 | SM_ENTER(WPA_PTK, DISCONNECT); |
2181 | } else if (sm->TimeoutEvt) | |
2182 | SM_ENTER(WPA_PTK, PTKSTART); | |
2183 | break; | |
2184 | case WPA_PTK_PTKCALCNEGOTIATING: | |
2185 | if (sm->MICVerified) | |
2186 | SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING2); | |
2187 | else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && | |
2188 | sm->EAPOLKeyPairwise) | |
2189 | SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); | |
2190 | else if (sm->TimeoutEvt) | |
2191 | SM_ENTER(WPA_PTK, PTKSTART); | |
2192 | break; | |
2193 | case WPA_PTK_PTKCALCNEGOTIATING2: | |
2194 | SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); | |
2195 | break; | |
2196 | case WPA_PTK_PTKINITNEGOTIATING: | |
68921e24 JM |
2197 | if (sm->update_snonce) |
2198 | SM_ENTER(WPA_PTK, PTKCALCNEGOTIATING); | |
2199 | else if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && | |
2200 | sm->EAPOLKeyPairwise && sm->MICVerified) | |
6fc6879b JM |
2201 | SM_ENTER(WPA_PTK, PTKINITDONE); |
2202 | else if (sm->TimeoutCtr > | |
2203 | (int) dot11RSNAConfigPairwiseUpdateCount) { | |
2204 | wpa_auth->dot11RSNA4WayHandshakeFailures++; | |
1aae01fc BG |
2205 | wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, |
2206 | "PTKINITNEGOTIATING: Retry limit %d " | |
2207 | "reached", | |
2208 | dot11RSNAConfigPairwiseUpdateCount); | |
6fc6879b JM |
2209 | SM_ENTER(WPA_PTK, DISCONNECT); |
2210 | } else if (sm->TimeoutEvt) | |
2211 | SM_ENTER(WPA_PTK, PTKINITNEGOTIATING); | |
2212 | break; | |
2213 | case WPA_PTK_PTKINITDONE: | |
2214 | break; | |
2215 | } | |
2216 | } | |
2217 | ||
2218 | ||
2219 | SM_STATE(WPA_PTK_GROUP, IDLE) | |
2220 | { | |
2221 | SM_ENTRY_MA(WPA_PTK_GROUP, IDLE, wpa_ptk_group); | |
2222 | if (sm->Init) { | |
2223 | /* Init flag is not cleared here, so avoid busy | |
2224 | * loop by claiming nothing changed. */ | |
2225 | sm->changed = FALSE; | |
2226 | } | |
2227 | sm->GTimeoutCtr = 0; | |
2228 | } | |
2229 | ||
2230 | ||
2231 | SM_STATE(WPA_PTK_GROUP, REKEYNEGOTIATING) | |
2232 | { | |
2233 | u8 rsc[WPA_KEY_RSC_LEN]; | |
2234 | struct wpa_group *gsm = sm->group; | |
2235 | u8 *kde, *pos, hdr[2]; | |
2236 | size_t kde_len; | |
83421850 | 2237 | u8 *gtk, dummy_gtk[32]; |
6fc6879b JM |
2238 | |
2239 | SM_ENTRY_MA(WPA_PTK_GROUP, REKEYNEGOTIATING, wpa_ptk_group); | |
bae61562 JM |
2240 | |
2241 | sm->GTimeoutCtr++; | |
2242 | if (sm->GTimeoutCtr > (int) dot11RSNAConfigGroupUpdateCount) { | |
2243 | /* No point in sending the EAPOL-Key - we will disconnect | |
2244 | * immediately following this. */ | |
2245 | return; | |
2246 | } | |
2247 | ||
6fc6879b JM |
2248 | if (sm->wpa == WPA_VERSION_WPA) |
2249 | sm->PInitAKeys = FALSE; | |
2250 | sm->TimeoutEvt = FALSE; | |
2251 | /* Send EAPOL(1, 1, 1, !Pair, G, RSC, GNonce, MIC(PTK), GTK[GN]) */ | |
2252 | os_memset(rsc, 0, WPA_KEY_RSC_LEN); | |
2253 | if (gsm->wpa_group_state == WPA_GROUP_SETKEYSDONE) | |
2254 | wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, rsc); | |
2255 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
2256 | "sending 1/2 msg of Group Key Handshake"); | |
2257 | ||
83421850 JM |
2258 | gtk = gsm->GTK[gsm->GN - 1]; |
2259 | if (sm->wpa_auth->conf.disable_gtk) { | |
2260 | /* | |
2261 | * Provide unique random GTK to each STA to prevent use | |
2262 | * of GTK in the BSS. | |
2263 | */ | |
2264 | if (random_get_bytes(dummy_gtk, gsm->GTK_len) < 0) | |
2265 | return; | |
2266 | gtk = dummy_gtk; | |
2267 | } | |
6fc6879b JM |
2268 | if (sm->wpa == WPA_VERSION_WPA2) { |
2269 | kde_len = 2 + RSN_SELECTOR_LEN + 2 + gsm->GTK_len + | |
2270 | ieee80211w_kde_len(sm); | |
2271 | kde = os_malloc(kde_len); | |
2272 | if (kde == NULL) | |
2273 | return; | |
2274 | ||
2275 | pos = kde; | |
2276 | hdr[0] = gsm->GN & 0x03; | |
2277 | hdr[1] = 0; | |
2278 | pos = wpa_add_kde(pos, RSN_KEY_DATA_GROUPKEY, hdr, 2, | |
83421850 | 2279 | gtk, gsm->GTK_len); |
6fc6879b JM |
2280 | pos = ieee80211w_kde_add(sm, pos); |
2281 | } else { | |
83421850 | 2282 | kde = gtk; |
6fc6879b JM |
2283 | pos = kde + gsm->GTK_len; |
2284 | } | |
2285 | ||
2286 | wpa_send_eapol(sm->wpa_auth, sm, | |
2287 | WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC | | |
2288 | WPA_KEY_INFO_ACK | | |
2289 | (!sm->Pair ? WPA_KEY_INFO_INSTALL : 0), | |
2290 | rsc, gsm->GNonce, kde, pos - kde, gsm->GN, 1); | |
2291 | if (sm->wpa == WPA_VERSION_WPA2) | |
2292 | os_free(kde); | |
6fc6879b JM |
2293 | } |
2294 | ||
2295 | ||
2296 | SM_STATE(WPA_PTK_GROUP, REKEYESTABLISHED) | |
2297 | { | |
2298 | SM_ENTRY_MA(WPA_PTK_GROUP, REKEYESTABLISHED, wpa_ptk_group); | |
2299 | sm->EAPOLKeyReceived = FALSE; | |
2300 | if (sm->GUpdateStationKeys) | |
2301 | sm->group->GKeyDoneStations--; | |
2302 | sm->GUpdateStationKeys = FALSE; | |
2303 | sm->GTimeoutCtr = 0; | |
2304 | /* FIX: MLME.SetProtection.Request(TA, Tx_Rx) */ | |
2305 | wpa_auth_vlogger(sm->wpa_auth, sm->addr, LOGGER_INFO, | |
2306 | "group key handshake completed (%s)", | |
2307 | sm->wpa == WPA_VERSION_WPA ? "WPA" : "RSN"); | |
2308 | sm->has_GTK = TRUE; | |
2309 | } | |
2310 | ||
2311 | ||
2312 | SM_STATE(WPA_PTK_GROUP, KEYERROR) | |
2313 | { | |
2314 | SM_ENTRY_MA(WPA_PTK_GROUP, KEYERROR, wpa_ptk_group); | |
2315 | if (sm->GUpdateStationKeys) | |
2316 | sm->group->GKeyDoneStations--; | |
2317 | sm->GUpdateStationKeys = FALSE; | |
2318 | sm->Disconnect = TRUE; | |
2319 | } | |
2320 | ||
2321 | ||
2322 | SM_STEP(WPA_PTK_GROUP) | |
2323 | { | |
9663596f | 2324 | if (sm->Init || sm->PtkGroupInit) { |
6fc6879b | 2325 | SM_ENTER(WPA_PTK_GROUP, IDLE); |
9663596f JM |
2326 | sm->PtkGroupInit = FALSE; |
2327 | } else switch (sm->wpa_ptk_group_state) { | |
6fc6879b JM |
2328 | case WPA_PTK_GROUP_IDLE: |
2329 | if (sm->GUpdateStationKeys || | |
2330 | (sm->wpa == WPA_VERSION_WPA && sm->PInitAKeys)) | |
2331 | SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); | |
2332 | break; | |
2333 | case WPA_PTK_GROUP_REKEYNEGOTIATING: | |
2334 | if (sm->EAPOLKeyReceived && !sm->EAPOLKeyRequest && | |
2335 | !sm->EAPOLKeyPairwise && sm->MICVerified) | |
2336 | SM_ENTER(WPA_PTK_GROUP, REKEYESTABLISHED); | |
2337 | else if (sm->GTimeoutCtr > | |
2338 | (int) dot11RSNAConfigGroupUpdateCount) | |
2339 | SM_ENTER(WPA_PTK_GROUP, KEYERROR); | |
2340 | else if (sm->TimeoutEvt) | |
2341 | SM_ENTER(WPA_PTK_GROUP, REKEYNEGOTIATING); | |
2342 | break; | |
2343 | case WPA_PTK_GROUP_KEYERROR: | |
2344 | SM_ENTER(WPA_PTK_GROUP, IDLE); | |
2345 | break; | |
2346 | case WPA_PTK_GROUP_REKEYESTABLISHED: | |
2347 | SM_ENTER(WPA_PTK_GROUP, IDLE); | |
2348 | break; | |
2349 | } | |
2350 | } | |
2351 | ||
2352 | ||
2353 | static int wpa_gtk_update(struct wpa_authenticator *wpa_auth, | |
2354 | struct wpa_group *group) | |
2355 | { | |
2356 | int ret = 0; | |
2357 | ||
6fc6879b JM |
2358 | os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); |
2359 | inc_byte_array(group->Counter, WPA_NONCE_LEN); | |
3c7302c2 JM |
2360 | if (wpa_gmk_to_gtk(group->GMK, "Group key expansion", |
2361 | wpa_auth->addr, group->GNonce, | |
2362 | group->GTK[group->GN - 1], group->GTK_len) < 0) | |
2363 | ret = -1; | |
5cb9d5c3 JM |
2364 | wpa_hexdump_key(MSG_DEBUG, "GTK", |
2365 | group->GTK[group->GN - 1], group->GTK_len); | |
6fc6879b JM |
2366 | |
2367 | #ifdef CONFIG_IEEE80211W | |
70f8cc8e | 2368 | if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION) { |
5cb9d5c3 JM |
2369 | os_memcpy(group->GNonce, group->Counter, WPA_NONCE_LEN); |
2370 | inc_byte_array(group->Counter, WPA_NONCE_LEN); | |
3c7302c2 JM |
2371 | if (wpa_gmk_to_gtk(group->GMK, "IGTK key expansion", |
2372 | wpa_auth->addr, group->GNonce, | |
2373 | group->IGTK[group->GN_igtk - 4], | |
2374 | WPA_IGTK_LEN) < 0) | |
2375 | ret = -1; | |
6fc6879b JM |
2376 | wpa_hexdump_key(MSG_DEBUG, "IGTK", |
2377 | group->IGTK[group->GN_igtk - 4], WPA_IGTK_LEN); | |
2378 | } | |
2379 | #endif /* CONFIG_IEEE80211W */ | |
2380 | ||
2381 | return ret; | |
2382 | } | |
2383 | ||
2384 | ||
2385 | static void wpa_group_gtk_init(struct wpa_authenticator *wpa_auth, | |
2386 | struct wpa_group *group) | |
2387 | { | |
2388 | wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " | |
2389 | "GTK_INIT (VLAN-ID %d)", group->vlan_id); | |
2390 | group->changed = FALSE; /* GInit is not cleared here; avoid loop */ | |
2391 | group->wpa_group_state = WPA_GROUP_GTK_INIT; | |
2392 | ||
2393 | /* GTK[0..N] = 0 */ | |
2394 | os_memset(group->GTK, 0, sizeof(group->GTK)); | |
2395 | group->GN = 1; | |
2396 | group->GM = 2; | |
2397 | #ifdef CONFIG_IEEE80211W | |
2398 | group->GN_igtk = 4; | |
2399 | group->GM_igtk = 5; | |
2400 | #endif /* CONFIG_IEEE80211W */ | |
2401 | /* GTK[GN] = CalcGTK() */ | |
2402 | wpa_gtk_update(wpa_auth, group); | |
2403 | } | |
2404 | ||
2405 | ||
2406 | static int wpa_group_update_sta(struct wpa_state_machine *sm, void *ctx) | |
2407 | { | |
473b6f22 MB |
2408 | if (ctx != NULL && ctx != sm->group) |
2409 | return 0; | |
2410 | ||
6fc6879b JM |
2411 | if (sm->wpa_ptk_state != WPA_PTK_PTKINITDONE) { |
2412 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
2413 | "Not in PTKINITDONE; skip Group Key update"); | |
3c183894 | 2414 | sm->GUpdateStationKeys = FALSE; |
6fc6879b JM |
2415 | return 0; |
2416 | } | |
9663596f JM |
2417 | if (sm->GUpdateStationKeys) { |
2418 | /* | |
3c183894 JM |
2419 | * This should not really happen, so add a debug log entry. |
2420 | * Since we clear the GKeyDoneStations before the loop, the | |
2421 | * station needs to be counted here anyway. | |
9663596f JM |
2422 | */ |
2423 | wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG, | |
3c183894 JM |
2424 | "GUpdateStationKeys was already set when " |
2425 | "marking station for GTK rekeying"); | |
9663596f | 2426 | } |
3c183894 | 2427 | |
ad3872a3 | 2428 | /* Do not rekey GTK/IGTK when STA is in WNM-Sleep Mode */ |
d32d94db XC |
2429 | if (sm->is_wnmsleep) |
2430 | return 0; | |
d32d94db | 2431 | |
3c183894 JM |
2432 | sm->group->GKeyDoneStations++; |
2433 | sm->GUpdateStationKeys = TRUE; | |
2434 | ||
6fc6879b JM |
2435 | wpa_sm_step(sm); |
2436 | return 0; | |
2437 | } | |
2438 | ||
2439 | ||
ad3872a3 JM |
2440 | #ifdef CONFIG_WNM |
2441 | /* update GTK when exiting WNM-Sleep Mode */ | |
d32d94db XC |
2442 | void wpa_wnmsleep_rekey_gtk(struct wpa_state_machine *sm) |
2443 | { | |
2444 | if (sm->is_wnmsleep) | |
2445 | return; | |
2446 | ||
2447 | wpa_group_update_sta(sm, NULL); | |
2448 | } | |
2449 | ||
2450 | ||
2451 | void wpa_set_wnmsleep(struct wpa_state_machine *sm, int flag) | |
2452 | { | |
2453 | sm->is_wnmsleep = !!flag; | |
2454 | } | |
2455 | ||
2456 | ||
2457 | int wpa_wnmsleep_gtk_subelem(struct wpa_state_machine *sm, u8 *pos) | |
2458 | { | |
d32d94db | 2459 | struct wpa_group *gsm = sm->group; |
835822d4 | 2460 | u8 *start = pos; |
d32d94db XC |
2461 | |
2462 | /* | |
835822d4 | 2463 | * GTK subelement: |
d32d94db | 2464 | * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] | |
835822d4 | 2465 | * Key[5..32] |
d32d94db | 2466 | */ |
835822d4 JM |
2467 | *pos++ = WNM_SLEEP_SUBELEM_GTK; |
2468 | *pos++ = 11 + gsm->GTK_len; | |
d32d94db | 2469 | /* Key ID in B0-B1 of Key Info */ |
835822d4 JM |
2470 | WPA_PUT_LE16(pos, gsm->GN & 0x03); |
2471 | pos += 2; | |
2472 | *pos++ = gsm->GTK_len; | |
2473 | if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, pos) != 0) | |
d32d94db | 2474 | return 0; |
835822d4 JM |
2475 | pos += 8; |
2476 | os_memcpy(pos, gsm->GTK[gsm->GN - 1], gsm->GTK_len); | |
2477 | pos += gsm->GTK_len; | |
d32d94db | 2478 | |
835822d4 JM |
2479 | wpa_printf(MSG_DEBUG, "WNM: GTK Key ID %u in WNM-Sleep Mode exit", |
2480 | gsm->GN); | |
2481 | wpa_hexdump_key(MSG_DEBUG, "WNM: GTK in WNM-Sleep Mode exit", | |
d32d94db | 2482 | gsm->GTK[gsm->GN - 1], gsm->GTK_len); |
d32d94db | 2483 | |
835822d4 | 2484 | return pos - start; |
d32d94db XC |
2485 | } |
2486 | ||
2487 | ||
2488 | #ifdef CONFIG_IEEE80211W | |
2489 | int wpa_wnmsleep_igtk_subelem(struct wpa_state_machine *sm, u8 *pos) | |
2490 | { | |
d32d94db | 2491 | struct wpa_group *gsm = sm->group; |
835822d4 | 2492 | u8 *start = pos; |
d32d94db | 2493 | |
835822d4 JM |
2494 | /* |
2495 | * IGTK subelement: | |
2496 | * Sub-elem ID[1] | Length[1] | KeyID[2] | PN[6] | Key[16] | |
2497 | */ | |
2498 | *pos++ = WNM_SLEEP_SUBELEM_IGTK; | |
2499 | *pos++ = 2 + 6 + WPA_IGTK_LEN; | |
2500 | WPA_PUT_LE16(pos, gsm->GN_igtk); | |
2501 | pos += 2; | |
2502 | if (wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos) != 0) | |
d32d94db | 2503 | return 0; |
835822d4 | 2504 | pos += 6; |
d32d94db | 2505 | |
835822d4 JM |
2506 | os_memcpy(pos, gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); |
2507 | pos += WPA_IGTK_LEN; | |
d32d94db | 2508 | |
835822d4 JM |
2509 | wpa_printf(MSG_DEBUG, "WNM: IGTK Key ID %u in WNM-Sleep Mode exit", |
2510 | gsm->GN_igtk); | |
2511 | wpa_hexdump_key(MSG_DEBUG, "WNM: IGTK in WNM-Sleep Mode exit", | |
d32d94db | 2512 | gsm->IGTK[gsm->GN_igtk - 4], WPA_IGTK_LEN); |
d32d94db | 2513 | |
835822d4 | 2514 | return pos - start; |
d32d94db XC |
2515 | } |
2516 | #endif /* CONFIG_IEEE80211W */ | |
ad3872a3 | 2517 | #endif /* CONFIG_WNM */ |
d32d94db XC |
2518 | |
2519 | ||
6fc6879b JM |
2520 | static void wpa_group_setkeys(struct wpa_authenticator *wpa_auth, |
2521 | struct wpa_group *group) | |
2522 | { | |
2523 | int tmp; | |
2524 | ||
2525 | wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " | |
2526 | "SETKEYS (VLAN-ID %d)", group->vlan_id); | |
2527 | group->changed = TRUE; | |
2528 | group->wpa_group_state = WPA_GROUP_SETKEYS; | |
2529 | group->GTKReKey = FALSE; | |
2530 | tmp = group->GM; | |
2531 | group->GM = group->GN; | |
2532 | group->GN = tmp; | |
2533 | #ifdef CONFIG_IEEE80211W | |
2534 | tmp = group->GM_igtk; | |
2535 | group->GM_igtk = group->GN_igtk; | |
2536 | group->GN_igtk = tmp; | |
2537 | #endif /* CONFIG_IEEE80211W */ | |
2538 | /* "GKeyDoneStations = GNoStations" is done in more robust way by | |
2539 | * counting the STAs that are marked with GUpdateStationKeys instead of | |
2540 | * including all STAs that could be in not-yet-completed state. */ | |
2541 | wpa_gtk_update(wpa_auth, group); | |
2542 | ||
3c183894 JM |
2543 | if (group->GKeyDoneStations) { |
2544 | wpa_printf(MSG_DEBUG, "wpa_group_setkeys: Unexpected " | |
2545 | "GKeyDoneStations=%d when starting new GTK rekey", | |
2546 | group->GKeyDoneStations); | |
2547 | group->GKeyDoneStations = 0; | |
2548 | } | |
473b6f22 | 2549 | wpa_auth_for_each_sta(wpa_auth, wpa_group_update_sta, group); |
6fc6879b JM |
2550 | wpa_printf(MSG_DEBUG, "wpa_group_setkeys: GKeyDoneStations=%d", |
2551 | group->GKeyDoneStations); | |
2552 | } | |
2553 | ||
2554 | ||
1bdb7ab3 JM |
2555 | static int wpa_group_config_group_keys(struct wpa_authenticator *wpa_auth, |
2556 | struct wpa_group *group) | |
6fc6879b | 2557 | { |
3c7302c2 JM |
2558 | int ret = 0; |
2559 | ||
3c7302c2 | 2560 | if (wpa_auth_set_key(wpa_auth, group->vlan_id, |
c3550295 | 2561 | wpa_cipher_to_alg(wpa_auth->conf.wpa_group), |
0382097e JM |
2562 | broadcast_ether_addr, group->GN, |
2563 | group->GTK[group->GN - 1], group->GTK_len) < 0) | |
3c7302c2 | 2564 | ret = -1; |
6fc6879b JM |
2565 | |
2566 | #ifdef CONFIG_IEEE80211W | |
3c7302c2 JM |
2567 | if (wpa_auth->conf.ieee80211w != NO_MGMT_FRAME_PROTECTION && |
2568 | wpa_auth_set_key(wpa_auth, group->vlan_id, WPA_ALG_IGTK, | |
0382097e | 2569 | broadcast_ether_addr, group->GN_igtk, |
3c7302c2 JM |
2570 | group->IGTK[group->GN_igtk - 4], |
2571 | WPA_IGTK_LEN) < 0) | |
2572 | ret = -1; | |
6fc6879b | 2573 | #endif /* CONFIG_IEEE80211W */ |
3c7302c2 JM |
2574 | |
2575 | return ret; | |
6fc6879b JM |
2576 | } |
2577 | ||
2578 | ||
1bdb7ab3 JM |
2579 | static int wpa_group_setkeysdone(struct wpa_authenticator *wpa_auth, |
2580 | struct wpa_group *group) | |
2581 | { | |
2582 | wpa_printf(MSG_DEBUG, "WPA: group state machine entering state " | |
2583 | "SETKEYSDONE (VLAN-ID %d)", group->vlan_id); | |
2584 | group->changed = TRUE; | |
2585 | group->wpa_group_state = WPA_GROUP_SETKEYSDONE; | |
2586 | ||
2587 | if (wpa_group_config_group_keys(wpa_auth, group) < 0) | |
2588 | return -1; | |
2589 | ||
2590 | return 0; | |
2591 | } | |
2592 | ||
2593 | ||
6fc6879b JM |
2594 | static void wpa_group_sm_step(struct wpa_authenticator *wpa_auth, |
2595 | struct wpa_group *group) | |
2596 | { | |
2597 | if (group->GInit) { | |
2598 | wpa_group_gtk_init(wpa_auth, group); | |
2599 | } else if (group->wpa_group_state == WPA_GROUP_GTK_INIT && | |
2600 | group->GTKAuthenticator) { | |
2601 | wpa_group_setkeysdone(wpa_auth, group); | |
2602 | } else if (group->wpa_group_state == WPA_GROUP_SETKEYSDONE && | |
2603 | group->GTKReKey) { | |
2604 | wpa_group_setkeys(wpa_auth, group); | |
2605 | } else if (group->wpa_group_state == WPA_GROUP_SETKEYS) { | |
2606 | if (group->GKeyDoneStations == 0) | |
2607 | wpa_group_setkeysdone(wpa_auth, group); | |
2608 | else if (group->GTKReKey) | |
2609 | wpa_group_setkeys(wpa_auth, group); | |
2610 | } | |
2611 | } | |
2612 | ||
2613 | ||
e4a6ea1d | 2614 | static int wpa_sm_step(struct wpa_state_machine *sm) |
6fc6879b JM |
2615 | { |
2616 | if (sm == NULL) | |
e4a6ea1d | 2617 | return 0; |
6fc6879b JM |
2618 | |
2619 | if (sm->in_step_loop) { | |
2620 | /* This should not happen, but if it does, make sure we do not | |
2621 | * end up freeing the state machine too early by exiting the | |
2622 | * recursive call. */ | |
2623 | wpa_printf(MSG_ERROR, "WPA: wpa_sm_step() called recursively"); | |
e4a6ea1d | 2624 | return 0; |
6fc6879b JM |
2625 | } |
2626 | ||
2627 | sm->in_step_loop = 1; | |
2628 | do { | |
2629 | if (sm->pending_deinit) | |
2630 | break; | |
2631 | ||
2632 | sm->changed = FALSE; | |
2633 | sm->wpa_auth->group->changed = FALSE; | |
2634 | ||
2635 | SM_STEP_RUN(WPA_PTK); | |
2636 | if (sm->pending_deinit) | |
2637 | break; | |
2638 | SM_STEP_RUN(WPA_PTK_GROUP); | |
2639 | if (sm->pending_deinit) | |
2640 | break; | |
2641 | wpa_group_sm_step(sm->wpa_auth, sm->group); | |
2642 | } while (sm->changed || sm->wpa_auth->group->changed); | |
2643 | sm->in_step_loop = 0; | |
2644 | ||
2645 | if (sm->pending_deinit) { | |
2646 | wpa_printf(MSG_DEBUG, "WPA: Completing pending STA state " | |
2647 | "machine deinit for " MACSTR, MAC2STR(sm->addr)); | |
2648 | wpa_free_sta_sm(sm); | |
e4a6ea1d | 2649 | return 1; |
6fc6879b | 2650 | } |
e4a6ea1d | 2651 | return 0; |
6fc6879b JM |
2652 | } |
2653 | ||
2654 | ||
2655 | static void wpa_sm_call_step(void *eloop_ctx, void *timeout_ctx) | |
2656 | { | |
2657 | struct wpa_state_machine *sm = eloop_ctx; | |
2658 | wpa_sm_step(sm); | |
2659 | } | |
2660 | ||
2661 | ||
2662 | void wpa_auth_sm_notify(struct wpa_state_machine *sm) | |
2663 | { | |
2664 | if (sm == NULL) | |
2665 | return; | |
2666 | eloop_register_timeout(0, 0, wpa_sm_call_step, sm, NULL); | |
2667 | } | |
2668 | ||
2669 | ||
2670 | void wpa_gtk_rekey(struct wpa_authenticator *wpa_auth) | |
2671 | { | |
2672 | int tmp, i; | |
2673 | struct wpa_group *group; | |
2674 | ||
2675 | if (wpa_auth == NULL) | |
2676 | return; | |
2677 | ||
2678 | group = wpa_auth->group; | |
2679 | ||
2680 | for (i = 0; i < 2; i++) { | |
2681 | tmp = group->GM; | |
2682 | group->GM = group->GN; | |
2683 | group->GN = tmp; | |
2684 | #ifdef CONFIG_IEEE80211W | |
2685 | tmp = group->GM_igtk; | |
2686 | group->GM_igtk = group->GN_igtk; | |
2687 | group->GN_igtk = tmp; | |
2688 | #endif /* CONFIG_IEEE80211W */ | |
2689 | wpa_gtk_update(wpa_auth, group); | |
9354e594 | 2690 | wpa_group_config_group_keys(wpa_auth, group); |
6fc6879b JM |
2691 | } |
2692 | } | |
2693 | ||
2694 | ||
2695 | static const char * wpa_bool_txt(int bool) | |
2696 | { | |
2697 | return bool ? "TRUE" : "FALSE"; | |
2698 | } | |
2699 | ||
2700 | ||
6fc6879b JM |
2701 | #define RSN_SUITE "%02x-%02x-%02x-%d" |
2702 | #define RSN_SUITE_ARG(s) \ | |
2703 | ((s) >> 24) & 0xff, ((s) >> 16) & 0xff, ((s) >> 8) & 0xff, (s) & 0xff | |
2704 | ||
2705 | int wpa_get_mib(struct wpa_authenticator *wpa_auth, char *buf, size_t buflen) | |
2706 | { | |
2707 | int len = 0, ret; | |
2708 | char pmkid_txt[PMKID_LEN * 2 + 1]; | |
8ce58ceb IH |
2709 | #ifdef CONFIG_RSN_PREAUTH |
2710 | const int preauth = 1; | |
2711 | #else /* CONFIG_RSN_PREAUTH */ | |
2712 | const int preauth = 0; | |
2713 | #endif /* CONFIG_RSN_PREAUTH */ | |
6fc6879b JM |
2714 | |
2715 | if (wpa_auth == NULL) | |
2716 | return len; | |
2717 | ||
2718 | ret = os_snprintf(buf + len, buflen - len, | |
2719 | "dot11RSNAOptionImplemented=TRUE\n" | |
8ce58ceb | 2720 | "dot11RSNAPreauthenticationImplemented=%s\n" |
6fc6879b JM |
2721 | "dot11RSNAEnabled=%s\n" |
2722 | "dot11RSNAPreauthenticationEnabled=%s\n", | |
8ce58ceb | 2723 | wpa_bool_txt(preauth), |
6fc6879b JM |
2724 | wpa_bool_txt(wpa_auth->conf.wpa & WPA_PROTO_RSN), |
2725 | wpa_bool_txt(wpa_auth->conf.rsn_preauth)); | |
2726 | if (ret < 0 || (size_t) ret >= buflen - len) | |
2727 | return len; | |
2728 | len += ret; | |
2729 | ||
2730 | wpa_snprintf_hex(pmkid_txt, sizeof(pmkid_txt), | |
2731 | wpa_auth->dot11RSNAPMKIDUsed, PMKID_LEN); | |
2732 | ||
2733 | ret = os_snprintf( | |
2734 | buf + len, buflen - len, | |
2735 | "dot11RSNAConfigVersion=%u\n" | |
2736 | "dot11RSNAConfigPairwiseKeysSupported=9999\n" | |
2737 | /* FIX: dot11RSNAConfigGroupCipher */ | |
2738 | /* FIX: dot11RSNAConfigGroupRekeyMethod */ | |
2739 | /* FIX: dot11RSNAConfigGroupRekeyTime */ | |
2740 | /* FIX: dot11RSNAConfigGroupRekeyPackets */ | |
2741 | "dot11RSNAConfigGroupRekeyStrict=%u\n" | |
2742 | "dot11RSNAConfigGroupUpdateCount=%u\n" | |
2743 | "dot11RSNAConfigPairwiseUpdateCount=%u\n" | |
2744 | "dot11RSNAConfigGroupCipherSize=%u\n" | |
2745 | "dot11RSNAConfigPMKLifetime=%u\n" | |
2746 | "dot11RSNAConfigPMKReauthThreshold=%u\n" | |
2747 | "dot11RSNAConfigNumberOfPTKSAReplayCounters=0\n" | |
2748 | "dot11RSNAConfigSATimeout=%u\n" | |
2749 | "dot11RSNAAuthenticationSuiteSelected=" RSN_SUITE "\n" | |
2750 | "dot11RSNAPairwiseCipherSelected=" RSN_SUITE "\n" | |
2751 | "dot11RSNAGroupCipherSelected=" RSN_SUITE "\n" | |
2752 | "dot11RSNAPMKIDUsed=%s\n" | |
2753 | "dot11RSNAAuthenticationSuiteRequested=" RSN_SUITE "\n" | |
2754 | "dot11RSNAPairwiseCipherRequested=" RSN_SUITE "\n" | |
2755 | "dot11RSNAGroupCipherRequested=" RSN_SUITE "\n" | |
2756 | "dot11RSNATKIPCounterMeasuresInvoked=%u\n" | |
2757 | "dot11RSNA4WayHandshakeFailures=%u\n" | |
2758 | "dot11RSNAConfigNumberOfGTKSAReplayCounters=0\n", | |
2759 | RSN_VERSION, | |
2760 | !!wpa_auth->conf.wpa_strict_rekey, | |
2761 | dot11RSNAConfigGroupUpdateCount, | |
2762 | dot11RSNAConfigPairwiseUpdateCount, | |
c3550295 | 2763 | wpa_cipher_key_len(wpa_auth->conf.wpa_group) * 8, |
6fc6879b JM |
2764 | dot11RSNAConfigPMKLifetime, |
2765 | dot11RSNAConfigPMKReauthThreshold, | |
2766 | dot11RSNAConfigSATimeout, | |
2767 | RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteSelected), | |
2768 | RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherSelected), | |
2769 | RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherSelected), | |
2770 | pmkid_txt, | |
2771 | RSN_SUITE_ARG(wpa_auth->dot11RSNAAuthenticationSuiteRequested), | |
2772 | RSN_SUITE_ARG(wpa_auth->dot11RSNAPairwiseCipherRequested), | |
2773 | RSN_SUITE_ARG(wpa_auth->dot11RSNAGroupCipherRequested), | |
2774 | wpa_auth->dot11RSNATKIPCounterMeasuresInvoked, | |
2775 | wpa_auth->dot11RSNA4WayHandshakeFailures); | |
2776 | if (ret < 0 || (size_t) ret >= buflen - len) | |
2777 | return len; | |
2778 | len += ret; | |
2779 | ||
2780 | /* TODO: dot11RSNAConfigPairwiseCiphersTable */ | |
2781 | /* TODO: dot11RSNAConfigAuthenticationSuitesTable */ | |
2782 | ||
2783 | /* Private MIB */ | |
2784 | ret = os_snprintf(buf + len, buflen - len, "hostapdWPAGroupState=%d\n", | |
2785 | wpa_auth->group->wpa_group_state); | |
2786 | if (ret < 0 || (size_t) ret >= buflen - len) | |
2787 | return len; | |
2788 | len += ret; | |
2789 | ||
2790 | return len; | |
2791 | } | |
2792 | ||
2793 | ||
2794 | int wpa_get_mib_sta(struct wpa_state_machine *sm, char *buf, size_t buflen) | |
2795 | { | |
2796 | int len = 0, ret; | |
2797 | u32 pairwise = 0; | |
2798 | ||
2799 | if (sm == NULL) | |
2800 | return 0; | |
2801 | ||
2802 | /* TODO: FF-FF-FF-FF-FF-FF entry for broadcast/multicast stats */ | |
2803 | ||
2804 | /* dot11RSNAStatsEntry */ | |
2805 | ||
c3550295 JM |
2806 | pairwise = wpa_cipher_to_suite(sm->wpa == WPA_VERSION_WPA2 ? |
2807 | WPA_PROTO_RSN : WPA_PROTO_WPA, | |
2808 | sm->pairwise); | |
2809 | if (pairwise == 0) | |
6fc6879b JM |
2810 | return 0; |
2811 | ||
2812 | ret = os_snprintf( | |
2813 | buf + len, buflen - len, | |
2814 | /* TODO: dot11RSNAStatsIndex */ | |
2815 | "dot11RSNAStatsSTAAddress=" MACSTR "\n" | |
2816 | "dot11RSNAStatsVersion=1\n" | |
2817 | "dot11RSNAStatsSelectedPairwiseCipher=" RSN_SUITE "\n" | |
2818 | /* TODO: dot11RSNAStatsTKIPICVErrors */ | |
2819 | "dot11RSNAStatsTKIPLocalMICFailures=%u\n" | |
d9040cdb | 2820 | "dot11RSNAStatsTKIPRemoteMICFailures=%u\n" |
6fc6879b JM |
2821 | /* TODO: dot11RSNAStatsCCMPReplays */ |
2822 | /* TODO: dot11RSNAStatsCCMPDecryptErrors */ | |
2823 | /* TODO: dot11RSNAStatsTKIPReplays */, | |
2824 | MAC2STR(sm->addr), | |
2825 | RSN_SUITE_ARG(pairwise), | |
2826 | sm->dot11RSNAStatsTKIPLocalMICFailures, | |
2827 | sm->dot11RSNAStatsTKIPRemoteMICFailures); | |
2828 | if (ret < 0 || (size_t) ret >= buflen - len) | |
2829 | return len; | |
2830 | len += ret; | |
2831 | ||
2832 | /* Private MIB */ | |
2833 | ret = os_snprintf(buf + len, buflen - len, | |
2834 | "hostapdWPAPTKState=%d\n" | |
2835 | "hostapdWPAPTKGroupState=%d\n", | |
2836 | sm->wpa_ptk_state, | |
2837 | sm->wpa_ptk_group_state); | |
2838 | if (ret < 0 || (size_t) ret >= buflen - len) | |
2839 | return len; | |
2840 | len += ret; | |
2841 | ||
2842 | return len; | |
2843 | } | |
2844 | ||
2845 | ||
2846 | void wpa_auth_countermeasures_start(struct wpa_authenticator *wpa_auth) | |
2847 | { | |
2848 | if (wpa_auth) | |
2849 | wpa_auth->dot11RSNATKIPCounterMeasuresInvoked++; | |
2850 | } | |
2851 | ||
2852 | ||
2853 | int wpa_auth_pairwise_set(struct wpa_state_machine *sm) | |
2854 | { | |
2855 | return sm && sm->pairwise_set; | |
2856 | } | |
2857 | ||
2858 | ||
ff36ff00 JM |
2859 | int wpa_auth_get_pairwise(struct wpa_state_machine *sm) |
2860 | { | |
2861 | return sm->pairwise; | |
2862 | } | |
2863 | ||
2864 | ||
6fc6879b JM |
2865 | int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm) |
2866 | { | |
2867 | if (sm == NULL) | |
2868 | return -1; | |
2869 | return sm->wpa_key_mgmt; | |
2870 | } | |
2871 | ||
2872 | ||
2873 | int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm) | |
2874 | { | |
2875 | if (sm == NULL) | |
2876 | return 0; | |
2877 | return sm->wpa; | |
2878 | } | |
2879 | ||
2880 | ||
2881 | int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm, | |
2882 | struct rsn_pmksa_cache_entry *entry) | |
2883 | { | |
2884 | if (sm == NULL || sm->pmksa != entry) | |
2885 | return -1; | |
2886 | sm->pmksa = NULL; | |
2887 | return 0; | |
2888 | } | |
2889 | ||
2890 | ||
2891 | struct rsn_pmksa_cache_entry * | |
2892 | wpa_auth_sta_get_pmksa(struct wpa_state_machine *sm) | |
2893 | { | |
2894 | return sm ? sm->pmksa : NULL; | |
2895 | } | |
2896 | ||
2897 | ||
2898 | void wpa_auth_sta_local_mic_failure_report(struct wpa_state_machine *sm) | |
2899 | { | |
2900 | if (sm) | |
2901 | sm->dot11RSNAStatsTKIPLocalMICFailures++; | |
2902 | } | |
2903 | ||
2904 | ||
2905 | const u8 * wpa_auth_get_wpa_ie(struct wpa_authenticator *wpa_auth, size_t *len) | |
2906 | { | |
2907 | if (wpa_auth == NULL) | |
2908 | return NULL; | |
2909 | *len = wpa_auth->wpa_ie_len; | |
2910 | return wpa_auth->wpa_ie; | |
2911 | } | |
2912 | ||
2913 | ||
2914 | int wpa_auth_pmksa_add(struct wpa_state_machine *sm, const u8 *pmk, | |
2915 | int session_timeout, struct eapol_state_machine *eapol) | |
2916 | { | |
cb465555 JM |
2917 | if (sm == NULL || sm->wpa != WPA_VERSION_WPA2 || |
2918 | sm->wpa_auth->conf.disable_pmksa_caching) | |
6fc6879b JM |
2919 | return -1; |
2920 | ||
4bb081f1 JM |
2921 | if (pmksa_cache_auth_add(sm->wpa_auth->pmksa, pmk, PMK_LEN, |
2922 | sm->wpa_auth->addr, sm->addr, session_timeout, | |
2923 | eapol, sm->wpa_key_mgmt)) | |
6fc6879b JM |
2924 | return 0; |
2925 | ||
2926 | return -1; | |
2927 | } | |
2928 | ||
2929 | ||
2930 | int wpa_auth_pmksa_add_preauth(struct wpa_authenticator *wpa_auth, | |
2931 | const u8 *pmk, size_t len, const u8 *sta_addr, | |
2932 | int session_timeout, | |
2933 | struct eapol_state_machine *eapol) | |
2934 | { | |
2935 | if (wpa_auth == NULL) | |
2936 | return -1; | |
2937 | ||
4bb081f1 JM |
2938 | if (pmksa_cache_auth_add(wpa_auth->pmksa, pmk, len, wpa_auth->addr, |
2939 | sta_addr, session_timeout, eapol, | |
2940 | WPA_KEY_MGMT_IEEE8021X)) | |
6fc6879b JM |
2941 | return 0; |
2942 | ||
2943 | return -1; | |
2944 | } | |
2945 | ||
2946 | ||
2947 | static struct wpa_group * | |
2948 | wpa_auth_add_group(struct wpa_authenticator *wpa_auth, int vlan_id) | |
2949 | { | |
2950 | struct wpa_group *group; | |
2951 | ||
2952 | if (wpa_auth == NULL || wpa_auth->group == NULL) | |
2953 | return NULL; | |
2954 | ||
2955 | wpa_printf(MSG_DEBUG, "WPA: Add group state machine for VLAN-ID %d", | |
2956 | vlan_id); | |
bdffdc5d | 2957 | group = wpa_group_init(wpa_auth, vlan_id, 0); |
6fc6879b JM |
2958 | if (group == NULL) |
2959 | return NULL; | |
2960 | ||
2961 | group->next = wpa_auth->group->next; | |
2962 | wpa_auth->group->next = group; | |
2963 | ||
2964 | return group; | |
2965 | } | |
2966 | ||
2967 | ||
2968 | int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id) | |
2969 | { | |
2970 | struct wpa_group *group; | |
2971 | ||
2972 | if (sm == NULL || sm->wpa_auth == NULL) | |
2973 | return 0; | |
2974 | ||
2975 | group = sm->wpa_auth->group; | |
2976 | while (group) { | |
2977 | if (group->vlan_id == vlan_id) | |
2978 | break; | |
2979 | group = group->next; | |
2980 | } | |
2981 | ||
2982 | if (group == NULL) { | |
2983 | group = wpa_auth_add_group(sm->wpa_auth, vlan_id); | |
2984 | if (group == NULL) | |
2985 | return -1; | |
2986 | } | |
2987 | ||
2988 | if (sm->group == group) | |
2989 | return 0; | |
2990 | ||
2991 | wpa_printf(MSG_DEBUG, "WPA: Moving STA " MACSTR " to use group state " | |
2992 | "machine for VLAN ID %d", MAC2STR(sm->addr), vlan_id); | |
2993 | ||
2994 | sm->group = group; | |
2995 | return 0; | |
2996 | } | |
e4bf4db9 JM |
2997 | |
2998 | ||
2999 | void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth, | |
3000 | struct wpa_state_machine *sm, int ack) | |
3001 | { | |
3002 | if (wpa_auth == NULL || sm == NULL) | |
3003 | return; | |
3004 | wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key TX status for STA " MACSTR | |
3005 | " ack=%d", MAC2STR(sm->addr), ack); | |
3006 | if (sm->pending_1_of_4_timeout && ack) { | |
3007 | /* | |
3008 | * Some deployed supplicant implementations update their SNonce | |
3009 | * for each EAPOL-Key 2/4 message even within the same 4-way | |
3010 | * handshake and then fail to use the first SNonce when | |
3011 | * deriving the PTK. This results in unsuccessful 4-way | |
3012 | * handshake whenever the relatively short initial timeout is | |
3013 | * reached and EAPOL-Key 1/4 is retransmitted. Try to work | |
3014 | * around this by increasing the timeout now that we know that | |
3015 | * the station has received the frame. | |
3016 | */ | |
3017 | int timeout_ms = eapol_key_timeout_subseq; | |
3018 | wpa_printf(MSG_DEBUG, "WPA: Increase initial EAPOL-Key 1/4 " | |
3019 | "timeout by %u ms because of acknowledged frame", | |
3020 | timeout_ms); | |
3021 | eloop_cancel_timeout(wpa_send_eapol_timeout, wpa_auth, sm); | |
3022 | eloop_register_timeout(timeout_ms / 1000, | |
3023 | (timeout_ms % 1000) * 1000, | |
3024 | wpa_send_eapol_timeout, wpa_auth, sm); | |
3025 | } | |
3026 | } | |
c10347f2 JM |
3027 | |
3028 | ||
3029 | int wpa_auth_uses_sae(struct wpa_state_machine *sm) | |
3030 | { | |
3031 | if (sm == NULL) | |
3032 | return 0; | |
3033 | return wpa_key_mgmt_sae(sm->wpa_key_mgmt); | |
3034 | } |