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6fc6879b JM |
1 | /* |
2 | * hostapd - IEEE 802.11r - Fast BSS Transition | |
3 | * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * Alternatively, this software may be distributed under the terms of BSD | |
10 | * license. | |
11 | * | |
12 | * See README and COPYING for more details. | |
13 | */ | |
14 | ||
15 | #include "includes.h" | |
16 | ||
17 | #include "common.h" | |
18 | #include "config.h" | |
19 | #include "wpa.h" | |
20 | #include "aes_wrap.h" | |
21 | #include "ieee802_11.h" | |
f238cf9f | 22 | #include "wme.h" |
6fc6879b JM |
23 | #include "defs.h" |
24 | #include "wpa_auth_i.h" | |
25 | #include "wpa_auth_ie.h" | |
26 | ||
27 | ||
28 | #ifdef CONFIG_IEEE80211R | |
29 | ||
f238cf9f JM |
30 | struct wpa_ft_ies { |
31 | const u8 *mdie; | |
32 | size_t mdie_len; | |
33 | const u8 *ftie; | |
34 | size_t ftie_len; | |
35 | const u8 *r1kh_id; | |
36 | const u8 *gtk; | |
37 | size_t gtk_len; | |
38 | const u8 *r0kh_id; | |
39 | size_t r0kh_id_len; | |
40 | const u8 *rsn; | |
41 | size_t rsn_len; | |
42 | const u8 *rsn_pmkid; | |
43 | const u8 *ric; | |
44 | size_t ric_len; | |
45 | }; | |
46 | ||
47 | ||
48 | static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len, | |
49 | struct wpa_ft_ies *parse); | |
50 | ||
51 | ||
6fc6879b JM |
52 | static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst, |
53 | const u8 *data, size_t data_len) | |
54 | { | |
55 | if (wpa_auth->cb.send_ether == NULL) | |
56 | return -1; | |
57 | return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB, | |
58 | data, data_len); | |
59 | } | |
60 | ||
61 | ||
62 | static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth, | |
63 | const u8 *dst, const u8 *data, size_t data_len) | |
64 | { | |
65 | if (wpa_auth->cb.send_ft_action == NULL) | |
66 | return -1; | |
67 | return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst, | |
68 | data, data_len); | |
69 | } | |
70 | ||
71 | ||
72 | static struct wpa_state_machine * | |
73 | wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr) | |
74 | { | |
75 | if (wpa_auth->cb.add_sta == NULL) | |
76 | return NULL; | |
77 | return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr); | |
78 | } | |
79 | ||
80 | ||
81 | int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len) | |
82 | { | |
83 | u8 *pos = buf; | |
84 | u8 capab; | |
85 | if (len < 2 + sizeof(struct rsn_mdie)) | |
86 | return -1; | |
87 | ||
88 | *pos++ = WLAN_EID_MOBILITY_DOMAIN; | |
89 | *pos++ = MOBILITY_DOMAIN_ID_LEN + 1; | |
90 | os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN); | |
91 | pos += MOBILITY_DOMAIN_ID_LEN; | |
92 | capab = RSN_FT_CAPAB_FT_OVER_DS; | |
93 | *pos++ = capab; | |
94 | ||
95 | return pos - buf; | |
96 | } | |
97 | ||
98 | ||
99 | static int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id, | |
100 | size_t r0kh_id_len, | |
101 | const u8 *anonce, const u8 *snonce, | |
102 | u8 *buf, size_t len, const u8 *subelem, | |
103 | size_t subelem_len) | |
104 | { | |
105 | u8 *pos = buf, *ielen; | |
106 | struct rsn_ftie *hdr; | |
107 | ||
108 | if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len + | |
109 | subelem_len) | |
110 | return -1; | |
111 | ||
112 | *pos++ = WLAN_EID_FAST_BSS_TRANSITION; | |
113 | ielen = pos++; | |
114 | ||
115 | hdr = (struct rsn_ftie *) pos; | |
116 | os_memset(hdr, 0, sizeof(*hdr)); | |
117 | pos += sizeof(*hdr); | |
118 | WPA_PUT_LE16(hdr->mic_control, 0); | |
119 | if (anonce) | |
120 | os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN); | |
121 | if (snonce) | |
122 | os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN); | |
123 | ||
124 | /* Optional Parameters */ | |
125 | *pos++ = FTIE_SUBELEM_R1KH_ID; | |
126 | *pos++ = FT_R1KH_ID_LEN; | |
127 | os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN); | |
128 | pos += FT_R1KH_ID_LEN; | |
129 | ||
130 | if (r0kh_id) { | |
131 | *pos++ = FTIE_SUBELEM_R0KH_ID; | |
132 | *pos++ = r0kh_id_len; | |
133 | os_memcpy(pos, r0kh_id, r0kh_id_len); | |
134 | pos += r0kh_id_len; | |
135 | } | |
136 | ||
137 | if (subelem) { | |
138 | os_memcpy(pos, subelem, subelem_len); | |
139 | pos += subelem_len; | |
140 | } | |
141 | ||
142 | *ielen = pos - buf - 2; | |
143 | ||
144 | return pos - buf; | |
145 | } | |
146 | ||
147 | ||
148 | struct wpa_ft_pmk_r0_sa { | |
149 | struct wpa_ft_pmk_r0_sa *next; | |
150 | u8 pmk_r0[PMK_LEN]; | |
151 | u8 pmk_r0_name[WPA_PMK_NAME_LEN]; | |
152 | u8 spa[ETH_ALEN]; | |
153 | /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ | |
154 | int pmk_r1_pushed; | |
155 | }; | |
156 | ||
157 | struct wpa_ft_pmk_r1_sa { | |
158 | struct wpa_ft_pmk_r1_sa *next; | |
159 | u8 pmk_r1[PMK_LEN]; | |
160 | u8 pmk_r1_name[WPA_PMK_NAME_LEN]; | |
161 | u8 spa[ETH_ALEN]; | |
162 | /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */ | |
163 | }; | |
164 | ||
165 | struct wpa_ft_pmk_cache { | |
166 | struct wpa_ft_pmk_r0_sa *pmk_r0; | |
167 | struct wpa_ft_pmk_r1_sa *pmk_r1; | |
168 | }; | |
169 | ||
170 | struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void) | |
171 | { | |
172 | struct wpa_ft_pmk_cache *cache; | |
173 | ||
174 | cache = os_zalloc(sizeof(*cache)); | |
175 | ||
176 | return cache; | |
177 | } | |
178 | ||
179 | ||
180 | void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache) | |
181 | { | |
182 | struct wpa_ft_pmk_r0_sa *r0, *r0prev; | |
183 | struct wpa_ft_pmk_r1_sa *r1, *r1prev; | |
184 | ||
185 | r0 = cache->pmk_r0; | |
186 | while (r0) { | |
187 | r0prev = r0; | |
188 | r0 = r0->next; | |
189 | os_memset(r0prev->pmk_r0, 0, PMK_LEN); | |
190 | os_free(r0prev); | |
191 | } | |
192 | ||
193 | r1 = cache->pmk_r1; | |
194 | while (r1) { | |
195 | r1prev = r1; | |
196 | r1 = r1->next; | |
197 | os_memset(r1prev->pmk_r1, 0, PMK_LEN); | |
198 | os_free(r1prev); | |
199 | } | |
200 | ||
201 | os_free(cache); | |
202 | } | |
203 | ||
204 | ||
205 | static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth, | |
206 | const u8 *spa, const u8 *pmk_r0, | |
207 | const u8 *pmk_r0_name) | |
208 | { | |
209 | struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; | |
210 | struct wpa_ft_pmk_r0_sa *r0; | |
211 | ||
212 | /* TODO: add expiration and limit on number of entries in cache */ | |
213 | ||
214 | r0 = os_zalloc(sizeof(*r0)); | |
215 | if (r0 == NULL) | |
216 | return -1; | |
217 | ||
218 | os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN); | |
219 | os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); | |
220 | os_memcpy(r0->spa, spa, ETH_ALEN); | |
221 | ||
222 | r0->next = cache->pmk_r0; | |
223 | cache->pmk_r0 = r0; | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | ||
229 | static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth, | |
230 | const u8 *spa, const u8 *pmk_r0_name, | |
231 | u8 *pmk_r0) | |
232 | { | |
233 | struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; | |
234 | struct wpa_ft_pmk_r0_sa *r0; | |
235 | ||
236 | r0 = cache->pmk_r0; | |
237 | while (r0) { | |
238 | if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 && | |
239 | os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN) | |
240 | == 0) { | |
241 | os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | r0 = r0->next; | |
246 | } | |
247 | ||
248 | return -1; | |
249 | } | |
250 | ||
251 | ||
252 | static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth, | |
253 | const u8 *spa, const u8 *pmk_r1, | |
254 | const u8 *pmk_r1_name) | |
255 | { | |
256 | struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; | |
257 | struct wpa_ft_pmk_r1_sa *r1; | |
258 | ||
259 | /* TODO: add expiration and limit on number of entries in cache */ | |
260 | ||
261 | r1 = os_zalloc(sizeof(*r1)); | |
262 | if (r1 == NULL) | |
263 | return -1; | |
264 | ||
265 | os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN); | |
266 | os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); | |
267 | os_memcpy(r1->spa, spa, ETH_ALEN); | |
268 | ||
269 | r1->next = cache->pmk_r1; | |
270 | cache->pmk_r1 = r1; | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | ||
276 | static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth, | |
277 | const u8 *spa, const u8 *pmk_r1_name, | |
278 | u8 *pmk_r1) | |
279 | { | |
280 | struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache; | |
281 | struct wpa_ft_pmk_r1_sa *r1; | |
282 | ||
283 | r1 = cache->pmk_r1; | |
284 | while (r1) { | |
285 | if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 && | |
286 | os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN) | |
287 | == 0) { | |
288 | os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN); | |
289 | return 0; | |
290 | } | |
291 | ||
292 | r1 = r1->next; | |
293 | } | |
294 | ||
295 | return -1; | |
296 | } | |
297 | ||
298 | ||
299 | static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth, | |
300 | const u8 *s1kh_id, const u8 *r0kh_id, | |
301 | size_t r0kh_id_len, const u8 *pmk_r0_name) | |
302 | { | |
303 | struct ft_remote_r0kh *r0kh; | |
304 | struct ft_r0kh_r1kh_pull_frame frame, f; | |
305 | ||
306 | r0kh = wpa_auth->conf.r0kh_list; | |
307 | while (r0kh) { | |
308 | if (r0kh->id_len == r0kh_id_len && | |
309 | os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0) | |
310 | break; | |
311 | r0kh = r0kh->next; | |
312 | } | |
313 | if (r0kh == NULL) | |
314 | return -1; | |
315 | ||
316 | wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH " | |
317 | "address " MACSTR, MAC2STR(r0kh->addr)); | |
318 | ||
319 | os_memset(&frame, 0, sizeof(frame)); | |
320 | frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; | |
321 | frame.packet_type = FT_PACKET_R0KH_R1KH_PULL; | |
322 | frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN); | |
323 | os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); | |
324 | ||
325 | /* aes_wrap() does not support inplace encryption, so use a temporary | |
326 | * buffer for the data. */ | |
327 | if (os_get_random(f.nonce, sizeof(f.nonce))) { | |
328 | wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " | |
329 | "nonce"); | |
330 | return -1; | |
331 | } | |
332 | os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN); | |
333 | os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN); | |
334 | os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); | |
335 | ||
336 | if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, | |
337 | f.nonce, frame.nonce) < 0) | |
338 | return -1; | |
339 | ||
340 | wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame)); | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | ||
346 | int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk, | |
347 | struct wpa_ptk *ptk) | |
348 | { | |
349 | u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN]; | |
350 | u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; | |
351 | u8 ptk_name[WPA_PMK_NAME_LEN]; | |
352 | const u8 *mdid = sm->wpa_auth->conf.mobility_domain; | |
353 | const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder; | |
354 | size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len; | |
355 | const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder; | |
356 | const u8 *ssid = sm->wpa_auth->conf.ssid; | |
357 | size_t ssid_len = sm->wpa_auth->conf.ssid_len; | |
358 | ||
359 | ||
360 | if (sm->xxkey_len == 0) { | |
361 | wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " | |
362 | "derivation"); | |
363 | return -1; | |
364 | } | |
365 | ||
366 | wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid, | |
367 | r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name); | |
368 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN); | |
369 | wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN); | |
370 | wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name); | |
371 | ||
372 | wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr, | |
373 | pmk_r1, pmk_r1_name); | |
374 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN); | |
375 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN); | |
376 | wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_name); | |
377 | ||
378 | wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, | |
379 | sm->wpa_auth->addr, pmk_r1_name, | |
380 | (u8 *) ptk, sizeof(*ptk), ptk_name); | |
381 | wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, sizeof(*ptk)); | |
382 | wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); | |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | ||
388 | static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth, | |
389 | const u8 *addr, int idx, u8 *seq) | |
390 | { | |
391 | if (wpa_auth->cb.get_seqnum == NULL) | |
392 | return -1; | |
393 | return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq); | |
394 | } | |
395 | ||
396 | ||
b27f13ed JM |
397 | #ifdef CONFIG_IEEE80211W |
398 | static inline int wpa_auth_get_seqnum_igtk(struct wpa_authenticator *wpa_auth, | |
399 | const u8 *addr, int idx, u8 *seq) | |
400 | { | |
401 | if (wpa_auth->cb.get_seqnum_igtk == NULL) | |
402 | return -1; | |
403 | return wpa_auth->cb.get_seqnum_igtk(wpa_auth->cb.ctx, addr, idx, seq); | |
404 | } | |
405 | #endif /* CONFIG_IEEE80211W */ | |
406 | ||
407 | ||
6fc6879b JM |
408 | static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len) |
409 | { | |
410 | u8 *subelem; | |
411 | struct wpa_group *gsm = sm->group; | |
412 | size_t subelem_len, pad_len; | |
413 | const u8 *key; | |
414 | size_t key_len; | |
415 | u8 keybuf[32]; | |
416 | ||
417 | key_len = gsm->GTK_len; | |
418 | if (key_len > sizeof(keybuf)) | |
419 | return NULL; | |
420 | ||
421 | /* | |
422 | * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less | |
423 | * than 16 bytes. | |
424 | */ | |
425 | pad_len = key_len % 8; | |
426 | if (pad_len) | |
427 | pad_len = 8 - pad_len; | |
428 | if (key_len + pad_len < 16) | |
429 | pad_len += 8; | |
430 | if (pad_len) { | |
431 | os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len); | |
432 | os_memset(keybuf + key_len, 0, pad_len); | |
433 | keybuf[key_len] = 0xdd; | |
434 | key_len += pad_len; | |
435 | key = keybuf; | |
436 | } else | |
437 | key = gsm->GTK[gsm->GN - 1]; | |
438 | ||
439 | /* | |
440 | * Sub-elem ID[1] | Length[1] | Key Info[1] | Key Length[1] | RSC[8] | | |
441 | * Key[5..32]. | |
442 | */ | |
443 | subelem_len = 12 + key_len + 8; | |
444 | subelem = os_zalloc(subelem_len); | |
445 | if (subelem == NULL) | |
446 | return NULL; | |
447 | ||
448 | subelem[0] = FTIE_SUBELEM_GTK; | |
449 | subelem[1] = 10 + key_len + 8; | |
450 | subelem[2] = gsm->GN & 0x03; /* Key ID in B0-B1 of Key Info */ | |
451 | subelem[3] = gsm->GTK_len; | |
452 | wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 4); | |
453 | if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 12)) { | |
454 | os_free(subelem); | |
455 | return NULL; | |
456 | } | |
457 | ||
458 | *len = subelem_len; | |
459 | return subelem; | |
460 | } | |
461 | ||
462 | ||
b27f13ed JM |
463 | #ifdef CONFIG_IEEE80211W |
464 | static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len) | |
465 | { | |
466 | u8 *subelem, *pos; | |
467 | struct wpa_group *gsm = sm->group; | |
468 | size_t subelem_len; | |
469 | ||
ff89afb7 JM |
470 | /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] | |
471 | * Key[16+8] */ | |
472 | subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8; | |
b27f13ed JM |
473 | subelem = os_zalloc(subelem_len); |
474 | if (subelem == NULL) | |
475 | return NULL; | |
476 | ||
477 | pos = subelem; | |
478 | *pos++ = FTIE_SUBELEM_IGTK; | |
479 | *pos++ = subelem_len - 2; | |
480 | WPA_PUT_LE16(pos, gsm->GN_igtk); | |
481 | pos += 2; | |
482 | wpa_auth_get_seqnum_igtk(sm->wpa_auth, NULL, gsm->GN_igtk, pos); | |
483 | pos += 6; | |
ff89afb7 | 484 | *pos++ = WPA_IGTK_LEN; |
b27f13ed JM |
485 | if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8, |
486 | gsm->IGTK[gsm->GN_igtk - 4], pos)) { | |
487 | os_free(subelem); | |
488 | return NULL; | |
489 | } | |
490 | ||
491 | *len = subelem_len; | |
492 | return subelem; | |
493 | } | |
494 | #endif /* CONFIG_IEEE80211W */ | |
495 | ||
496 | ||
f238cf9f JM |
497 | static u8 * wpa_ft_process_rdie(u8 *pos, u8 *end, u8 id, u8 descr_count, |
498 | const u8 *ies, size_t ies_len) | |
499 | { | |
500 | struct ieee802_11_elems parse; | |
501 | struct rsn_rdie *rdie; | |
502 | ||
503 | wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d", | |
504 | id, descr_count); | |
505 | wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)", | |
506 | ies, ies_len); | |
507 | ||
508 | if (end - pos < (int) sizeof(*rdie)) { | |
509 | wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE"); | |
510 | return pos; | |
511 | } | |
512 | ||
513 | *pos++ = WLAN_EID_RIC_DATA; | |
514 | *pos++ = sizeof(*rdie); | |
515 | rdie = (struct rsn_rdie *) pos; | |
516 | rdie->id = id; | |
517 | rdie->descr_count = 0; | |
518 | rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS); | |
519 | pos += sizeof(*rdie); | |
520 | ||
521 | if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) == | |
522 | ParseFailed) { | |
523 | wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs"); | |
524 | rdie->status_code = | |
525 | host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); | |
526 | return pos; | |
527 | } | |
528 | ||
529 | if (parse.wmm_tspec) { | |
530 | struct wmm_tspec_element *tspec; | |
531 | int res; | |
532 | ||
533 | if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) { | |
534 | wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE " | |
535 | "(%d)", (int) parse.wmm_tspec_len); | |
536 | rdie->status_code = | |
537 | host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); | |
538 | return pos; | |
539 | } | |
540 | if (end - pos < (int) sizeof(*tspec)) { | |
541 | wpa_printf(MSG_ERROR, "FT: Not enough room for " | |
542 | "response TSPEC"); | |
543 | rdie->status_code = | |
544 | host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); | |
545 | return pos; | |
546 | } | |
547 | tspec = (struct wmm_tspec_element *) pos; | |
548 | os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec)); | |
549 | res = wmm_process_tspec(tspec); | |
550 | wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res); | |
551 | if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS) | |
552 | rdie->status_code = | |
553 | host_to_le16(WLAN_STATUS_INVALID_PARAMETERS); | |
554 | else if (res == WMM_ADDTS_STATUS_REFUSED) | |
555 | rdie->status_code = | |
556 | host_to_le16(WLAN_STATUS_REQUEST_DECLINED); | |
557 | else { | |
558 | /* TSPEC accepted; include updated TSPEC in response */ | |
559 | rdie->descr_count = 1; | |
560 | pos += sizeof(*tspec); | |
561 | } | |
562 | return pos; | |
563 | } | |
564 | ||
565 | wpa_printf(MSG_DEBUG, "FT: No supported resource requested"); | |
566 | rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE); | |
567 | return pos; | |
568 | } | |
569 | ||
570 | ||
571 | static u8 * wpa_ft_process_ric(u8 *pos, u8 *end, const u8 *ric, size_t ric_len) | |
572 | { | |
573 | const u8 *rpos, *start; | |
574 | const struct rsn_rdie *rdie; | |
575 | ||
576 | wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len); | |
577 | ||
578 | rpos = ric; | |
579 | while (rpos + sizeof(*rdie) < ric + ric_len) { | |
580 | if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) || | |
581 | rpos + 2 + rpos[1] > ric + ric_len) | |
582 | break; | |
583 | rdie = (const struct rsn_rdie *) (rpos + 2); | |
584 | rpos += 2 + rpos[1]; | |
585 | start = rpos; | |
586 | ||
587 | while (rpos + 2 <= ric + ric_len && | |
588 | rpos + 2 + rpos[1] <= ric + ric_len) { | |
589 | if (rpos[0] == WLAN_EID_RIC_DATA) | |
590 | break; | |
591 | rpos += 2 + rpos[1]; | |
592 | } | |
593 | pos = wpa_ft_process_rdie(pos, end, rdie->id, | |
594 | rdie->descr_count, | |
595 | start, rpos - start); | |
596 | } | |
597 | ||
598 | return pos; | |
599 | } | |
600 | ||
601 | ||
6fc6879b | 602 | u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos, |
f238cf9f JM |
603 | size_t max_len, int auth_alg, |
604 | const u8 *req_ies, size_t req_ies_len) | |
6fc6879b JM |
605 | { |
606 | u8 *end, *mdie, *ftie, *rsnie, *r0kh_id, *subelem = NULL; | |
607 | size_t mdie_len, ftie_len, rsnie_len, r0kh_id_len, subelem_len = 0; | |
608 | int res; | |
609 | struct wpa_auth_config *conf; | |
610 | struct rsn_ftie *_ftie; | |
f238cf9f JM |
611 | struct wpa_ft_ies parse; |
612 | u8 *ric_start; | |
6fc6879b JM |
613 | |
614 | if (sm == NULL) | |
615 | return pos; | |
616 | ||
617 | conf = &sm->wpa_auth->conf; | |
618 | ||
619 | if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && | |
620 | sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK) | |
621 | return pos; | |
622 | ||
623 | end = pos + max_len; | |
624 | ||
625 | /* RSN */ | |
626 | res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name); | |
627 | if (res < 0) | |
628 | return pos; | |
629 | rsnie = pos; | |
630 | rsnie_len = res; | |
631 | pos += res; | |
632 | ||
633 | /* Mobility Domain Information */ | |
634 | res = wpa_write_mdie(conf, pos, end - pos); | |
635 | if (res < 0) | |
636 | return pos; | |
637 | mdie = pos; | |
638 | mdie_len = res; | |
639 | pos += res; | |
640 | ||
641 | /* Fast BSS Transition Information */ | |
642 | if (auth_alg == WLAN_AUTH_FT) { | |
643 | subelem = wpa_ft_gtk_subelem(sm, &subelem_len); | |
644 | r0kh_id = sm->r0kh_id; | |
645 | r0kh_id_len = sm->r0kh_id_len; | |
b27f13ed JM |
646 | #ifdef CONFIG_IEEE80211W |
647 | if (sm->mgmt_frame_prot) { | |
648 | u8 *igtk; | |
649 | size_t igtk_len; | |
650 | u8 *nbuf; | |
651 | igtk = wpa_ft_igtk_subelem(sm, &igtk_len); | |
652 | if (igtk == NULL) { | |
653 | os_free(subelem); | |
654 | return pos; | |
655 | } | |
656 | nbuf = os_realloc(subelem, subelem_len + igtk_len); | |
657 | if (nbuf == NULL) { | |
658 | os_free(subelem); | |
659 | os_free(igtk); | |
660 | return pos; | |
661 | } | |
662 | subelem = nbuf; | |
663 | os_memcpy(subelem + subelem_len, igtk, igtk_len); | |
664 | subelem_len += igtk_len; | |
665 | os_free(igtk); | |
666 | } | |
667 | #endif /* CONFIG_IEEE80211W */ | |
6fc6879b JM |
668 | } else { |
669 | r0kh_id = conf->r0_key_holder; | |
670 | r0kh_id_len = conf->r0_key_holder_len; | |
671 | } | |
672 | res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, NULL, NULL, pos, | |
673 | end - pos, subelem, subelem_len); | |
674 | os_free(subelem); | |
675 | if (res < 0) | |
676 | return pos; | |
677 | ftie = pos; | |
678 | ftie_len = res; | |
679 | pos += res; | |
680 | ||
681 | _ftie = (struct rsn_ftie *) (ftie + 2); | |
682 | _ftie->mic_control[1] = 3; /* Information element count */ | |
f238cf9f JM |
683 | |
684 | ric_start = pos; | |
685 | if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) { | |
686 | pos = wpa_ft_process_ric(pos, end, parse.ric, parse.ric_len); | |
687 | _ftie->mic_control[1] += ieee802_11_ie_count(ric_start, | |
688 | pos - ric_start); | |
689 | } | |
690 | if (ric_start == pos) | |
691 | ric_start = NULL; | |
692 | ||
6fc6879b JM |
693 | if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6, |
694 | mdie, mdie_len, ftie, ftie_len, | |
f238cf9f JM |
695 | rsnie, rsnie_len, |
696 | ric_start, ric_start ? pos - ric_start : 0, | |
697 | _ftie->mic) < 0) | |
6fc6879b JM |
698 | wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); |
699 | ||
700 | return pos; | |
701 | } | |
702 | ||
703 | ||
6fc6879b JM |
704 | static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len, |
705 | struct wpa_ft_ies *parse) | |
706 | { | |
707 | const u8 *end, *pos; | |
708 | ||
709 | parse->ftie = ie; | |
710 | parse->ftie_len = ie_len; | |
711 | ||
712 | pos = ie + sizeof(struct rsn_ftie); | |
713 | end = ie + ie_len; | |
714 | ||
715 | while (pos + 2 <= end && pos + 2 + pos[1] <= end) { | |
716 | switch (pos[0]) { | |
717 | case FTIE_SUBELEM_R1KH_ID: | |
718 | if (pos[1] != FT_R1KH_ID_LEN) { | |
719 | wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID " | |
720 | "length in FTIE: %d", pos[1]); | |
721 | return -1; | |
722 | } | |
723 | parse->r1kh_id = pos + 2; | |
724 | break; | |
725 | case FTIE_SUBELEM_GTK: | |
726 | parse->gtk = pos + 2; | |
727 | parse->gtk_len = pos[1]; | |
728 | break; | |
729 | case FTIE_SUBELEM_R0KH_ID: | |
730 | if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) { | |
731 | wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID " | |
732 | "length in FTIE: %d", pos[1]); | |
733 | return -1; | |
734 | } | |
735 | parse->r0kh_id = pos + 2; | |
736 | parse->r0kh_id_len = pos[1]; | |
737 | break; | |
738 | } | |
739 | ||
740 | pos += 2 + pos[1]; | |
741 | } | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
746 | ||
747 | static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len, | |
748 | struct wpa_ft_ies *parse) | |
749 | { | |
750 | const u8 *end, *pos; | |
751 | struct wpa_ie_data data; | |
752 | int ret; | |
babfbf15 JM |
753 | const struct rsn_ftie *ftie; |
754 | int prot_ie_count = 0; | |
6fc6879b JM |
755 | |
756 | os_memset(parse, 0, sizeof(*parse)); | |
757 | if (ies == NULL) | |
758 | return 0; | |
759 | ||
760 | pos = ies; | |
761 | end = ies + ies_len; | |
762 | while (pos + 2 <= end && pos + 2 + pos[1] <= end) { | |
763 | switch (pos[0]) { | |
764 | case WLAN_EID_RSN: | |
765 | parse->rsn = pos + 2; | |
766 | parse->rsn_len = pos[1]; | |
767 | ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2, | |
768 | parse->rsn_len + 2, | |
769 | &data); | |
770 | if (ret < 0) { | |
771 | wpa_printf(MSG_DEBUG, "FT: Failed to parse " | |
772 | "RSN IE: %d", ret); | |
773 | return -1; | |
774 | } | |
775 | if (data.num_pmkid == 1 && data.pmkid) | |
776 | parse->rsn_pmkid = data.pmkid; | |
777 | break; | |
778 | case WLAN_EID_MOBILITY_DOMAIN: | |
779 | parse->mdie = pos + 2; | |
780 | parse->mdie_len = pos[1]; | |
781 | break; | |
782 | case WLAN_EID_FAST_BSS_TRANSITION: | |
babfbf15 JM |
783 | if (pos[1] < sizeof(*ftie)) |
784 | return -1; | |
785 | ftie = (const struct rsn_ftie *) (pos + 2); | |
786 | prot_ie_count = ftie->mic_control[1]; | |
6fc6879b JM |
787 | if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0) |
788 | return -1; | |
789 | break; | |
babfbf15 JM |
790 | case WLAN_EID_RIC_DATA: |
791 | if (parse->ric == NULL) | |
792 | parse->ric = pos; | |
6fc6879b JM |
793 | } |
794 | ||
795 | pos += 2 + pos[1]; | |
796 | } | |
797 | ||
babfbf15 JM |
798 | if (prot_ie_count == 0) |
799 | return 0; /* no MIC */ | |
800 | ||
801 | /* | |
802 | * Check that the protected IE count matches with IEs included in the | |
803 | * frame. | |
804 | */ | |
805 | if (parse->rsn) | |
806 | prot_ie_count--; | |
807 | if (parse->mdie) | |
808 | prot_ie_count--; | |
809 | if (parse->ftie) | |
810 | prot_ie_count--; | |
811 | if (prot_ie_count < 0) { | |
812 | wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in " | |
813 | "the protected IE count"); | |
814 | return -1; | |
815 | } | |
816 | ||
817 | if (prot_ie_count == 0 && parse->ric) { | |
818 | wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not " | |
819 | "included in protected IE count"); | |
820 | return -1; | |
821 | } | |
822 | ||
823 | /* Determine the end of the RIC IE(s) */ | |
824 | pos = parse->ric; | |
825 | while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end && | |
826 | prot_ie_count) { | |
827 | prot_ie_count--; | |
828 | pos += 2 + pos[1]; | |
829 | } | |
830 | parse->ric_len = pos - parse->ric; | |
831 | if (prot_ie_count) { | |
832 | wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from " | |
833 | "frame", (int) prot_ie_count); | |
834 | return -1; | |
835 | } | |
836 | ||
6fc6879b JM |
837 | return 0; |
838 | } | |
839 | ||
840 | ||
841 | static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth, | |
842 | int vlan_id, | |
843 | const char *alg, const u8 *addr, int idx, | |
844 | u8 *key, size_t key_len) | |
845 | { | |
846 | if (wpa_auth->cb.set_key == NULL) | |
847 | return -1; | |
848 | return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx, | |
849 | key, key_len); | |
850 | } | |
851 | ||
852 | ||
853 | static void wpa_ft_install_ptk(struct wpa_state_machine *sm) | |
854 | { | |
855 | char *alg; | |
856 | int klen; | |
857 | ||
858 | /* MLME-SETKEYS.request(PTK) */ | |
859 | if (sm->pairwise == WPA_CIPHER_TKIP) { | |
860 | alg = "TKIP"; | |
861 | klen = 32; | |
862 | } else if (sm->pairwise == WPA_CIPHER_CCMP) { | |
863 | alg = "CCMP"; | |
864 | klen = 16; | |
865 | } else | |
866 | return; | |
867 | ||
868 | /* FIX: add STA entry to kernel/driver here? The set_key will fail | |
869 | * most likely without this.. At the moment, STA entry is added only | |
870 | * after association has been completed. Alternatively, could | |
871 | * re-configure PTK at that point(?). | |
872 | */ | |
873 | if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0, | |
874 | sm->PTK.tk1, klen)) | |
875 | return; | |
876 | ||
877 | /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */ | |
878 | sm->pairwise_set = TRUE; | |
879 | } | |
880 | ||
881 | ||
882 | static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm, | |
883 | const u8 *ies, size_t ies_len, | |
884 | u8 **resp_ies, size_t *resp_ies_len) | |
885 | { | |
886 | struct rsn_mdie *mdie; | |
887 | struct rsn_ftie *ftie; | |
888 | u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN]; | |
889 | u8 ptk_name[WPA_PMK_NAME_LEN]; | |
890 | struct wpa_auth_config *conf; | |
891 | struct wpa_ft_ies parse; | |
892 | size_t buflen; | |
893 | int ret; | |
894 | u8 *pos, *end; | |
895 | ||
896 | *resp_ies = NULL; | |
897 | *resp_ies_len = 0; | |
898 | ||
899 | sm->pmk_r1_name_valid = 0; | |
900 | conf = &sm->wpa_auth->conf; | |
901 | ||
902 | wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs", | |
903 | ies, ies_len); | |
904 | ||
905 | if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { | |
906 | wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); | |
907 | return WLAN_STATUS_UNSPECIFIED_FAILURE; | |
908 | } | |
909 | ||
910 | mdie = (struct rsn_mdie *) parse.mdie; | |
911 | if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || | |
912 | os_memcmp(mdie->mobility_domain, | |
913 | sm->wpa_auth->conf.mobility_domain, | |
914 | MOBILITY_DOMAIN_ID_LEN) != 0) { | |
915 | wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); | |
916 | return WLAN_STATUS_INVALID_MDIE; | |
917 | } | |
918 | ||
919 | ftie = (struct rsn_ftie *) parse.ftie; | |
920 | if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { | |
921 | wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); | |
922 | return WLAN_STATUS_INVALID_FTIE; | |
923 | } | |
924 | ||
925 | os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN); | |
926 | ||
927 | if (parse.r0kh_id == NULL) { | |
928 | wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID"); | |
929 | return WLAN_STATUS_INVALID_FTIE; | |
930 | } | |
931 | ||
932 | wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID", | |
933 | parse.r0kh_id, parse.r0kh_id_len); | |
934 | os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len); | |
935 | sm->r0kh_id_len = parse.r0kh_id_len; | |
936 | ||
937 | if (parse.rsn_pmkid == NULL) { | |
938 | wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); | |
939 | return WLAN_STATUS_INVALID_PMKID; | |
940 | } | |
941 | ||
942 | wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name", | |
943 | parse.rsn_pmkid, WPA_PMK_NAME_LEN); | |
944 | wpa_derive_pmk_r1_name(parse.rsn_pmkid, | |
945 | sm->wpa_auth->conf.r1_key_holder, sm->addr, | |
946 | pmk_r1_name); | |
947 | wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name", | |
948 | pmk_r1_name, WPA_PMK_NAME_LEN); | |
949 | ||
950 | if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1) < | |
951 | 0) { | |
952 | if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id, | |
953 | sm->r0kh_id_len, parse.rsn_pmkid) < 0) { | |
954 | wpa_printf(MSG_DEBUG, "FT: Did not have matching " | |
955 | "PMK-R1 and unknown R0KH-ID"); | |
956 | return WLAN_STATUS_INVALID_PMKID; | |
957 | } | |
958 | ||
959 | /* | |
960 | * TODO: Should return "status pending" (and the caller should | |
961 | * not send out response now). The real response will be sent | |
962 | * once the response from R0KH is received. | |
963 | */ | |
964 | return WLAN_STATUS_INVALID_PMKID; | |
965 | } | |
966 | ||
967 | wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN); | |
968 | sm->pmk_r1_name_valid = 1; | |
969 | os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN); | |
970 | ||
971 | if (os_get_random(sm->ANonce, WPA_NONCE_LEN)) { | |
972 | wpa_printf(MSG_DEBUG, "FT: Failed to get random data for " | |
973 | "ANonce"); | |
974 | return WLAN_STATUS_UNSPECIFIED_FAILURE; | |
975 | } | |
976 | ||
977 | wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", | |
978 | sm->SNonce, WPA_NONCE_LEN); | |
979 | wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce", | |
980 | sm->ANonce, WPA_NONCE_LEN); | |
981 | ||
982 | wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr, | |
983 | sm->wpa_auth->addr, pmk_r1_name, | |
984 | (u8 *) &sm->PTK, sizeof(sm->PTK), ptk_name); | |
985 | wpa_hexdump_key(MSG_DEBUG, "FT: PTK", | |
986 | (u8 *) &sm->PTK, sizeof(sm->PTK)); | |
987 | wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); | |
988 | ||
989 | wpa_ft_install_ptk(sm); | |
990 | ||
991 | buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + | |
992 | 2 + FT_R1KH_ID_LEN + 200; | |
993 | *resp_ies = os_zalloc(buflen); | |
994 | if (*resp_ies == NULL) { | |
995 | return WLAN_STATUS_UNSPECIFIED_FAILURE; | |
996 | } | |
997 | ||
998 | pos = *resp_ies; | |
999 | end = *resp_ies + buflen; | |
1000 | ||
1001 | ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid); | |
1002 | if (ret < 0) { | |
1003 | os_free(*resp_ies); | |
1004 | *resp_ies = NULL; | |
1005 | return WLAN_STATUS_UNSPECIFIED_FAILURE; | |
1006 | } | |
1007 | pos += ret; | |
1008 | ||
1009 | ret = wpa_write_mdie(conf, pos, end - pos); | |
1010 | if (ret < 0) { | |
1011 | os_free(*resp_ies); | |
1012 | *resp_ies = NULL; | |
1013 | return WLAN_STATUS_UNSPECIFIED_FAILURE; | |
1014 | } | |
1015 | pos += ret; | |
1016 | ||
1017 | ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len, | |
1018 | sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0); | |
1019 | if (ret < 0) { | |
1020 | os_free(*resp_ies); | |
1021 | *resp_ies = NULL; | |
1022 | return WLAN_STATUS_UNSPECIFIED_FAILURE; | |
1023 | } | |
1024 | pos += ret; | |
1025 | ||
1026 | *resp_ies_len = pos - *resp_ies; | |
1027 | ||
1028 | return WLAN_STATUS_SUCCESS; | |
1029 | } | |
1030 | ||
1031 | ||
1032 | void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid, | |
1033 | u16 auth_transaction, const u8 *ies, size_t ies_len, | |
1034 | void (*cb)(void *ctx, const u8 *dst, const u8 *bssid, | |
1035 | u16 auth_transaction, u16 status, | |
1036 | const u8 *ies, size_t ies_len), | |
1037 | void *ctx) | |
1038 | { | |
1039 | u16 status; | |
1040 | u8 *resp_ies; | |
1041 | size_t resp_ies_len; | |
1042 | ||
1043 | if (sm == NULL) { | |
1044 | wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but " | |
1045 | "WPA SM not available"); | |
1046 | return; | |
1047 | } | |
1048 | ||
1049 | wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR | |
1050 | " BSSID=" MACSTR " transaction=%d", | |
1051 | MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction); | |
1052 | status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies, | |
1053 | &resp_ies_len); | |
1054 | ||
1055 | wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR | |
1056 | " auth_transaction=%d status=%d", | |
1057 | MAC2STR(sm->addr), auth_transaction + 1, status); | |
1058 | wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); | |
1059 | cb(ctx, sm->addr, bssid, auth_transaction + 1, status, | |
1060 | resp_ies, resp_ies_len); | |
1061 | os_free(resp_ies); | |
1062 | } | |
1063 | ||
1064 | ||
1065 | u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies, | |
1066 | size_t ies_len) | |
1067 | { | |
1068 | struct wpa_ft_ies parse; | |
1069 | struct rsn_mdie *mdie; | |
1070 | struct rsn_ftie *ftie; | |
1071 | u8 mic[16]; | |
1072 | ||
1073 | if (sm == NULL) | |
1074 | return WLAN_STATUS_UNSPECIFIED_FAILURE; | |
1075 | ||
1076 | wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); | |
1077 | ||
1078 | if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { | |
1079 | wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs"); | |
1080 | return WLAN_STATUS_UNSPECIFIED_FAILURE; | |
1081 | } | |
1082 | ||
1083 | if (parse.rsn == NULL) { | |
1084 | wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req"); | |
1085 | return WLAN_STATUS_UNSPECIFIED_FAILURE; | |
1086 | } | |
1087 | ||
1088 | if (parse.rsn_pmkid == NULL) { | |
1089 | wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE"); | |
1090 | return WLAN_STATUS_INVALID_PMKID; | |
1091 | } | |
1092 | ||
1093 | if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0) | |
1094 | { | |
1095 | wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match " | |
1096 | "with the PMKR1Name derived from auth request"); | |
1097 | return WLAN_STATUS_INVALID_PMKID; | |
1098 | } | |
1099 | ||
1100 | mdie = (struct rsn_mdie *) parse.mdie; | |
1101 | if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || | |
1102 | os_memcmp(mdie->mobility_domain, | |
1103 | sm->wpa_auth->conf.mobility_domain, | |
1104 | MOBILITY_DOMAIN_ID_LEN) != 0) { | |
1105 | wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); | |
1106 | return WLAN_STATUS_INVALID_MDIE; | |
1107 | } | |
1108 | ||
1109 | ftie = (struct rsn_ftie *) parse.ftie; | |
1110 | if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { | |
1111 | wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); | |
1112 | return WLAN_STATUS_INVALID_FTIE; | |
1113 | } | |
1114 | ||
6fc6879b JM |
1115 | if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5, |
1116 | parse.mdie - 2, parse.mdie_len + 2, | |
1117 | parse.ftie - 2, parse.ftie_len + 2, | |
babfbf15 JM |
1118 | parse.rsn - 2, parse.rsn_len + 2, |
1119 | parse.ric, parse.ric_len, | |
6fc6879b JM |
1120 | mic) < 0) { |
1121 | wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); | |
1122 | return WLAN_STATUS_UNSPECIFIED_FAILURE; | |
1123 | } | |
1124 | ||
1125 | if (os_memcmp(mic, ftie->mic, 16) != 0) { | |
1126 | wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); | |
1127 | wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); | |
1128 | wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); | |
1129 | return WLAN_STATUS_INVALID_FTIE; | |
1130 | } | |
1131 | ||
1132 | return WLAN_STATUS_SUCCESS; | |
1133 | } | |
1134 | ||
1135 | ||
1136 | int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len) | |
1137 | { | |
1138 | const u8 *sta_addr, *target_ap; | |
1139 | const u8 *ies; | |
1140 | size_t ies_len; | |
1141 | u8 action; | |
1142 | struct ft_rrb_frame *frame; | |
1143 | ||
1144 | if (sm == NULL) | |
1145 | return -1; | |
1146 | ||
1147 | /* | |
1148 | * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] | |
1149 | * FT Request action frame body[variable] | |
1150 | */ | |
1151 | ||
1152 | if (len < 14) { | |
1153 | wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame " | |
1154 | "(len=%lu)", (unsigned long) len); | |
1155 | return -1; | |
1156 | } | |
1157 | ||
1158 | action = data[1]; | |
1159 | sta_addr = data + 2; | |
1160 | target_ap = data + 8; | |
1161 | ies = data + 14; | |
1162 | ies_len = len - 14; | |
1163 | ||
1164 | wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR | |
1165 | " Target AP=" MACSTR " Action=%d)", | |
1166 | MAC2STR(sta_addr), MAC2STR(target_ap), action); | |
1167 | ||
1168 | if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) { | |
1169 | wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: " | |
1170 | "STA=" MACSTR " STA-Address=" MACSTR, | |
1171 | MAC2STR(sm->addr), MAC2STR(sta_addr)); | |
1172 | return -1; | |
1173 | } | |
1174 | ||
1175 | /* | |
1176 | * Do some sanity checking on the target AP address (not own and not | |
1177 | * broadcast. This could be extended to filter based on a list of known | |
1178 | * APs in the MD (if such a list were configured). | |
1179 | */ | |
1180 | if ((target_ap[0] & 0x01) || | |
1181 | os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) { | |
1182 | wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action " | |
1183 | "frame"); | |
1184 | return -1; | |
1185 | } | |
1186 | ||
1187 | wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len); | |
1188 | ||
1189 | /* RRB - Forward action frame to the target AP */ | |
1190 | frame = os_malloc(sizeof(*frame) + len); | |
1191 | frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; | |
1192 | frame->packet_type = FT_PACKET_REQUEST; | |
1193 | frame->action_length = host_to_le16(len); | |
1194 | os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN); | |
1195 | os_memcpy(frame + 1, data, len); | |
1196 | ||
1197 | wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame, | |
1198 | sizeof(*frame) + len); | |
1199 | os_free(frame); | |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | ||
1205 | static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth, | |
1206 | const u8 *current_ap, const u8 *sta_addr, | |
1207 | const u8 *body, size_t len) | |
1208 | { | |
1209 | struct wpa_state_machine *sm; | |
1210 | u16 status; | |
1211 | u8 *resp_ies, *pos; | |
1212 | size_t resp_ies_len, rlen; | |
1213 | struct ft_rrb_frame *frame; | |
1214 | ||
1215 | sm = wpa_ft_add_sta(wpa_auth, sta_addr); | |
1216 | if (sm == NULL) { | |
1217 | wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on " | |
1218 | "RRB Request"); | |
1219 | return -1; | |
1220 | } | |
1221 | ||
1222 | wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len); | |
1223 | ||
1224 | status = wpa_ft_process_auth_req(sm, body, len, &resp_ies, | |
1225 | &resp_ies_len); | |
1226 | ||
1227 | wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR | |
1228 | " CurrentAP=" MACSTR " status=%d", | |
1229 | MAC2STR(sm->addr), MAC2STR(current_ap), status); | |
1230 | wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len); | |
1231 | ||
1232 | /* RRB - Forward action frame response to the Current AP */ | |
1233 | ||
1234 | /* | |
1235 | * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6] | |
1236 | * Status_Code[2] FT Request action frame body[variable] | |
1237 | */ | |
1238 | rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len; | |
1239 | ||
1240 | frame = os_malloc(sizeof(*frame) + rlen); | |
1241 | frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; | |
1242 | frame->packet_type = FT_PACKET_RESPONSE; | |
1243 | frame->action_length = host_to_le16(rlen); | |
1244 | os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN); | |
1245 | pos = (u8 *) (frame + 1); | |
1246 | *pos++ = WLAN_ACTION_FT; | |
1247 | *pos++ = 2; /* Action: Response */ | |
1248 | os_memcpy(pos, sta_addr, ETH_ALEN); | |
1249 | pos += ETH_ALEN; | |
1250 | os_memcpy(pos, wpa_auth->addr, ETH_ALEN); | |
1251 | pos += ETH_ALEN; | |
1252 | WPA_PUT_LE16(pos, status); | |
1253 | pos += 2; | |
1254 | if (resp_ies) { | |
1255 | os_memcpy(pos, resp_ies, resp_ies_len); | |
1256 | os_free(resp_ies); | |
1257 | } | |
1258 | ||
1259 | wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame, | |
1260 | sizeof(*frame) + rlen); | |
1261 | os_free(frame); | |
1262 | ||
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | ||
1267 | static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth, | |
1268 | const u8 *src_addr, | |
1269 | const u8 *data, size_t data_len) | |
1270 | { | |
1271 | struct ft_r0kh_r1kh_pull_frame *frame, f; | |
1272 | struct ft_remote_r1kh *r1kh; | |
1273 | struct ft_r0kh_r1kh_resp_frame resp, r; | |
1274 | u8 pmk_r0[PMK_LEN]; | |
1275 | ||
1276 | wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull"); | |
1277 | ||
1278 | if (data_len < sizeof(*frame)) | |
1279 | return -1; | |
1280 | ||
1281 | r1kh = wpa_auth->conf.r1kh_list; | |
1282 | while (r1kh) { | |
1283 | if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0) | |
1284 | break; | |
1285 | r1kh = r1kh->next; | |
1286 | } | |
1287 | if (r1kh == NULL) { | |
1288 | wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for " | |
1289 | "PMK-R1 pull source address " MACSTR, | |
1290 | MAC2STR(src_addr)); | |
1291 | return -1; | |
1292 | } | |
1293 | ||
1294 | frame = (struct ft_r0kh_r1kh_pull_frame *) data; | |
1295 | /* aes_unwrap() does not support inplace decryption, so use a temporary | |
1296 | * buffer for the data. */ | |
1297 | if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8, | |
1298 | frame->nonce, f.nonce) < 0) { | |
1299 | wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " | |
1300 | "request from " MACSTR, MAC2STR(src_addr)); | |
1301 | return -1; | |
1302 | } | |
1303 | ||
1304 | wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", | |
1305 | f.nonce, sizeof(f.nonce)); | |
1306 | wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name", | |
1307 | f.pmk_r0_name, WPA_PMK_NAME_LEN); | |
1308 | wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID=" | |
1309 | MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); | |
1310 | ||
1311 | os_memset(&resp, 0, sizeof(resp)); | |
1312 | resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; | |
1313 | resp.packet_type = FT_PACKET_R0KH_R1KH_RESP; | |
1314 | resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN); | |
1315 | os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN); | |
1316 | ||
1317 | /* aes_wrap() does not support inplace encryption, so use a temporary | |
1318 | * buffer for the data. */ | |
1319 | os_memcpy(r.nonce, f.nonce, sizeof(f.nonce)); | |
1320 | os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN); | |
1321 | os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN); | |
1322 | if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0) < | |
1323 | 0) { | |
1324 | wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for " | |
1325 | "PMK-R1 pull"); | |
1326 | return -1; | |
1327 | } | |
1328 | ||
1329 | wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id, | |
1330 | r.pmk_r1, r.pmk_r1_name); | |
1331 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN); | |
1332 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name, | |
1333 | WPA_PMK_NAME_LEN); | |
1334 | ||
1335 | if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, | |
1336 | r.nonce, resp.nonce) < 0) { | |
1337 | os_memset(pmk_r0, 0, PMK_LEN); | |
1338 | return -1; | |
1339 | } | |
1340 | ||
1341 | os_memset(pmk_r0, 0, PMK_LEN); | |
1342 | ||
1343 | wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp)); | |
1344 | ||
1345 | return 0; | |
1346 | } | |
1347 | ||
1348 | ||
1349 | static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth, | |
1350 | const u8 *src_addr, | |
1351 | const u8 *data, size_t data_len) | |
1352 | { | |
1353 | struct ft_r0kh_r1kh_resp_frame *frame, f; | |
1354 | struct ft_remote_r0kh *r0kh; | |
1355 | ||
1356 | wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response"); | |
1357 | ||
1358 | if (data_len < sizeof(*frame)) | |
1359 | return -1; | |
1360 | ||
1361 | r0kh = wpa_auth->conf.r0kh_list; | |
1362 | while (r0kh) { | |
1363 | if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) | |
1364 | break; | |
1365 | r0kh = r0kh->next; | |
1366 | } | |
1367 | if (r0kh == NULL) { | |
1368 | wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " | |
1369 | "PMK-R0 pull response source address " MACSTR, | |
1370 | MAC2STR(src_addr)); | |
1371 | return -1; | |
1372 | } | |
1373 | ||
1374 | frame = (struct ft_r0kh_r1kh_resp_frame *) data; | |
1375 | /* aes_unwrap() does not support inplace decryption, so use a temporary | |
1376 | * buffer for the data. */ | |
1377 | if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8, | |
1378 | frame->nonce, f.nonce) < 0) { | |
1379 | wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull " | |
1380 | "response from " MACSTR, MAC2STR(src_addr)); | |
1381 | return -1; | |
1382 | } | |
1383 | ||
1384 | if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) | |
1385 | != 0) { | |
1386 | wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a " | |
1387 | "matching R1KH-ID"); | |
1388 | return -1; | |
1389 | } | |
1390 | ||
1391 | /* TODO: verify that <nonce,s1kh_id> matches with a pending request | |
1392 | * and call this requests callback function to finish request | |
1393 | * processing */ | |
1394 | ||
1395 | wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce", | |
1396 | f.nonce, sizeof(f.nonce)); | |
1397 | wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID=" | |
1398 | MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); | |
1399 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1", | |
1400 | f.pmk_r1, PMK_LEN); | |
1401 | wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name", | |
1402 | f.pmk_r1_name, WPA_PMK_NAME_LEN); | |
1403 | ||
1404 | wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name); | |
1405 | os_memset(f.pmk_r1, 0, PMK_LEN); | |
1406 | ||
1407 | return 0; | |
1408 | } | |
1409 | ||
1410 | ||
1411 | static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth, | |
1412 | const u8 *src_addr, | |
1413 | const u8 *data, size_t data_len) | |
1414 | { | |
1415 | struct ft_r0kh_r1kh_push_frame *frame, f; | |
1416 | struct ft_remote_r0kh *r0kh; | |
1417 | struct os_time now; | |
1418 | os_time_t tsend; | |
1419 | ||
1420 | wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push"); | |
1421 | ||
1422 | if (data_len < sizeof(*frame)) | |
1423 | return -1; | |
1424 | ||
1425 | r0kh = wpa_auth->conf.r0kh_list; | |
1426 | while (r0kh) { | |
1427 | if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0) | |
1428 | break; | |
1429 | r0kh = r0kh->next; | |
1430 | } | |
1431 | if (r0kh == NULL) { | |
1432 | wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for " | |
1433 | "PMK-R0 push source address " MACSTR, | |
1434 | MAC2STR(src_addr)); | |
1435 | return -1; | |
1436 | } | |
1437 | ||
1438 | frame = (struct ft_r0kh_r1kh_push_frame *) data; | |
1439 | /* aes_unwrap() does not support inplace decryption, so use a temporary | |
1440 | * buffer for the data. */ | |
1441 | if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, | |
1442 | frame->timestamp, f.timestamp) < 0) { | |
1443 | wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from " | |
1444 | MACSTR, MAC2STR(src_addr)); | |
1445 | return -1; | |
1446 | } | |
1447 | ||
1448 | os_get_time(&now); | |
1449 | tsend = WPA_GET_LE32(f.timestamp); | |
1450 | if ((now.sec > tsend && now.sec - tsend > 60) || | |
1451 | (now.sec < tsend && tsend - now.sec > 60)) { | |
1452 | wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid " | |
1453 | "timestamp: sender time %d own time %d\n", | |
1454 | (int) tsend, (int) now.sec); | |
1455 | return -1; | |
1456 | } | |
1457 | ||
1458 | if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN) | |
1459 | != 0) { | |
1460 | wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching " | |
1461 | "R1KH-ID (received " MACSTR " own " MACSTR ")", | |
1462 | MAC2STR(f.r1kh_id), | |
1463 | MAC2STR(wpa_auth->conf.r1_key_holder)); | |
1464 | return -1; | |
1465 | } | |
1466 | ||
1467 | wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID=" | |
1468 | MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id)); | |
1469 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1", | |
1470 | f.pmk_r1, PMK_LEN); | |
1471 | wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name", | |
1472 | f.pmk_r1_name, WPA_PMK_NAME_LEN); | |
1473 | ||
1474 | wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name); | |
1475 | os_memset(f.pmk_r1, 0, PMK_LEN); | |
1476 | ||
1477 | return 0; | |
1478 | } | |
1479 | ||
1480 | ||
1481 | int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr, | |
1482 | const u8 *data, size_t data_len) | |
1483 | { | |
1484 | struct ft_rrb_frame *frame; | |
1485 | u16 alen; | |
1486 | const u8 *pos, *end, *start; | |
1487 | u8 action; | |
1488 | const u8 *sta_addr, *target_ap_addr; | |
1489 | ||
1490 | wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR, | |
1491 | MAC2STR(src_addr)); | |
1492 | ||
1493 | if (data_len < sizeof(*frame)) { | |
1494 | wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)", | |
1495 | (unsigned long) data_len); | |
1496 | return -1; | |
1497 | } | |
1498 | ||
1499 | pos = data; | |
1500 | frame = (struct ft_rrb_frame *) pos; | |
1501 | pos += sizeof(*frame); | |
1502 | ||
1503 | alen = le_to_host16(frame->action_length); | |
1504 | wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d " | |
1505 | "action_length=%d ap_address=" MACSTR, | |
1506 | frame->frame_type, frame->packet_type, alen, | |
1507 | MAC2STR(frame->ap_address)); | |
1508 | ||
1509 | if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) { | |
c1e033b0 | 1510 | /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */ |
6fc6879b JM |
1511 | wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with " |
1512 | "unrecognized type %d", frame->frame_type); | |
1513 | return -1; | |
1514 | } | |
1515 | ||
1516 | if (alen > data_len - sizeof(*frame)) { | |
1517 | wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action " | |
1518 | "frame"); | |
1519 | return -1; | |
1520 | } | |
1521 | ||
1522 | if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL) | |
1523 | return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len); | |
1524 | if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP) | |
1525 | return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len); | |
1526 | if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH) | |
1527 | return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len); | |
1528 | ||
1529 | wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen); | |
1530 | ||
1531 | if (alen < 1 + 1 + 2 * ETH_ALEN) { | |
1532 | wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough " | |
1533 | "room for Action Frame body); alen=%lu", | |
1534 | (unsigned long) alen); | |
1535 | return -1; | |
1536 | } | |
1537 | start = pos; | |
1538 | end = pos + alen; | |
1539 | ||
1540 | if (*pos != WLAN_ACTION_FT) { | |
1541 | wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category " | |
1542 | "%d", *pos); | |
1543 | return -1; | |
1544 | } | |
1545 | ||
1546 | pos++; | |
1547 | action = *pos++; | |
1548 | sta_addr = pos; | |
1549 | pos += ETH_ALEN; | |
1550 | target_ap_addr = pos; | |
1551 | pos += ETH_ALEN; | |
1552 | wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr=" | |
1553 | MACSTR " target_ap_addr=" MACSTR, | |
1554 | action, MAC2STR(sta_addr), MAC2STR(target_ap_addr)); | |
1555 | ||
1556 | if (frame->packet_type == FT_PACKET_REQUEST) { | |
1557 | wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request"); | |
1558 | ||
1559 | if (action != 1) { | |
1560 | wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in " | |
1561 | "RRB Request", action); | |
1562 | return -1; | |
1563 | } | |
1564 | ||
1565 | if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) { | |
1566 | wpa_printf(MSG_DEBUG, "FT: Target AP address in the " | |
1567 | "RRB Request does not match with own " | |
1568 | "address"); | |
1569 | return -1; | |
1570 | } | |
1571 | ||
1572 | if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address, | |
1573 | sta_addr, pos, end - pos) < 0) | |
1574 | return -1; | |
1575 | } else if (frame->packet_type == FT_PACKET_RESPONSE) { | |
1576 | u16 status_code; | |
1577 | ||
1578 | if (end - pos < 2) { | |
1579 | wpa_printf(MSG_DEBUG, "FT: Not enough room for status " | |
1580 | "code in RRB Response"); | |
1581 | return -1; | |
1582 | } | |
1583 | status_code = WPA_GET_LE16(pos); | |
1584 | pos += 2; | |
1585 | ||
1586 | wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response " | |
1587 | "(status_code=%d)", status_code); | |
1588 | ||
1589 | if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0) | |
1590 | return -1; | |
1591 | } else { | |
1592 | wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown " | |
1593 | "packet_type %d", frame->packet_type); | |
1594 | return -1; | |
1595 | } | |
1596 | ||
1597 | return 0; | |
1598 | } | |
1599 | ||
1600 | ||
1601 | static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth, | |
1602 | struct wpa_ft_pmk_r0_sa *pmk_r0, | |
1603 | struct ft_remote_r1kh *r1kh, | |
1604 | const u8 *s1kh_id) | |
1605 | { | |
1606 | struct ft_r0kh_r1kh_push_frame frame, f; | |
1607 | struct os_time now; | |
1608 | ||
1609 | os_memset(&frame, 0, sizeof(frame)); | |
1610 | frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB; | |
1611 | frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH; | |
1612 | frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN); | |
1613 | os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN); | |
1614 | ||
1615 | /* aes_wrap() does not support inplace encryption, so use a temporary | |
1616 | * buffer for the data. */ | |
1617 | os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN); | |
1618 | os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN); | |
1619 | os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN); | |
1620 | wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id, | |
1621 | s1kh_id, f.pmk_r1, f.pmk_r1_name); | |
1622 | wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id)); | |
1623 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN); | |
1624 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name, | |
1625 | WPA_PMK_NAME_LEN); | |
1626 | os_get_time(&now); | |
1627 | WPA_PUT_LE32(f.timestamp, now.sec); | |
1628 | if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8, | |
1629 | f.timestamp, frame.timestamp) < 0) | |
1630 | return; | |
1631 | ||
1632 | wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame)); | |
1633 | } | |
1634 | ||
1635 | ||
1636 | void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr) | |
1637 | { | |
1638 | struct wpa_ft_pmk_r0_sa *r0; | |
1639 | struct ft_remote_r1kh *r1kh; | |
1640 | ||
1641 | if (!wpa_auth->conf.pmk_r1_push) | |
1642 | return; | |
1643 | ||
1644 | r0 = wpa_auth->ft_pmk_cache->pmk_r0; | |
1645 | while (r0) { | |
1646 | if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0) | |
1647 | break; | |
1648 | r0 = r0->next; | |
1649 | } | |
1650 | ||
1651 | if (r0 == NULL || r0->pmk_r1_pushed) | |
1652 | return; | |
1653 | r0->pmk_r1_pushed = 1; | |
1654 | ||
1655 | wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs " | |
1656 | "for STA " MACSTR, MAC2STR(addr)); | |
1657 | ||
1658 | r1kh = wpa_auth->conf.r1kh_list; | |
1659 | while (r1kh) { | |
1660 | wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr); | |
1661 | r1kh = r1kh->next; | |
1662 | } | |
1663 | } | |
1664 | ||
1665 | #endif /* CONFIG_IEEE80211R */ |