1 /*
2 * hostapd - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2004-2009, 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 "utils/includes.h"
16
17 #include "utils/common.h"
18 #include "common/ieee802_11_defs.h"
19 #include "common/ieee802_11_common.h"
20 #include "crypto/aes_wrap.h"
21 #include "crypto/random.h"
22 #include "ap_config.h"
23 #include "ieee802_11.h"
24 #include "wmm.h"
25 #include "wpa_auth.h"
26 #include "wpa_auth_i.h"
27 #include "wpa_auth_ie.h"
28
29
30 #ifdef CONFIG_IEEE80211R
31
32 struct wpa_ft_ies {
33 const u8 *mdie;
34 size_t mdie_len;
35 const u8 *ftie;
36 size_t ftie_len;
37 const u8 *r1kh_id;
38 const u8 *gtk;
39 size_t gtk_len;
40 const u8 *r0kh_id;
41 size_t r0kh_id_len;
42 const u8 *rsn;
43 size_t rsn_len;
44 const u8 *rsn_pmkid;
45 const u8 *ric;
46 size_t ric_len;
47 };
48
49
50 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
51 struct wpa_ft_ies *parse);
52
53
wpa_ft_rrb_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)54 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
55 const u8 *data, size_t data_len)
56 {
57 if (wpa_auth->cb.send_ether == NULL)
58 return -1;
59 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
60 return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
61 data, data_len);
62 }
63
64
wpa_ft_action_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)65 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
66 const u8 *dst, const u8 *data, size_t data_len)
67 {
68 if (wpa_auth->cb.send_ft_action == NULL)
69 return -1;
70 return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
71 data, data_len);
72 }
73
74
75 static struct wpa_state_machine *
wpa_ft_add_sta(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)76 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
77 {
78 if (wpa_auth->cb.add_sta == NULL)
79 return NULL;
80 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
81 }
82
83
wpa_write_mdie(struct wpa_auth_config * conf,u8 * buf,size_t len)84 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
85 {
86 u8 *pos = buf;
87 u8 capab;
88 if (len < 2 + sizeof(struct rsn_mdie))
89 return -1;
90
91 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
92 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
93 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
94 pos += MOBILITY_DOMAIN_ID_LEN;
95 capab = 0;
96 if (conf->ft_over_ds)
97 capab |= RSN_FT_CAPAB_FT_OVER_DS;
98 *pos++ = capab;
99
100 return pos - buf;
101 }
102
103
wpa_write_ftie(struct wpa_auth_config * conf,const u8 * r0kh_id,size_t r0kh_id_len,const u8 * anonce,const u8 * snonce,u8 * buf,size_t len,const u8 * subelem,size_t subelem_len)104 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
105 size_t r0kh_id_len,
106 const u8 *anonce, const u8 *snonce,
107 u8 *buf, size_t len, const u8 *subelem,
108 size_t subelem_len)
109 {
110 u8 *pos = buf, *ielen;
111 struct rsn_ftie *hdr;
112
113 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
114 subelem_len)
115 return -1;
116
117 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
118 ielen = pos++;
119
120 hdr = (struct rsn_ftie *) pos;
121 os_memset(hdr, 0, sizeof(*hdr));
122 pos += sizeof(*hdr);
123 WPA_PUT_LE16(hdr->mic_control, 0);
124 if (anonce)
125 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
126 if (snonce)
127 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
128
129 /* Optional Parameters */
130 *pos++ = FTIE_SUBELEM_R1KH_ID;
131 *pos++ = FT_R1KH_ID_LEN;
132 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
133 pos += FT_R1KH_ID_LEN;
134
135 if (r0kh_id) {
136 *pos++ = FTIE_SUBELEM_R0KH_ID;
137 *pos++ = r0kh_id_len;
138 os_memcpy(pos, r0kh_id, r0kh_id_len);
139 pos += r0kh_id_len;
140 }
141
142 if (subelem) {
143 os_memcpy(pos, subelem, subelem_len);
144 pos += subelem_len;
145 }
146
147 *ielen = pos - buf - 2;
148
149 return pos - buf;
150 }
151
152
153 struct wpa_ft_pmk_r0_sa {
154 struct wpa_ft_pmk_r0_sa *next;
155 u8 pmk_r0[PMK_LEN];
156 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
157 u8 spa[ETH_ALEN];
158 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
159 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
160 int pmk_r1_pushed;
161 };
162
163 struct wpa_ft_pmk_r1_sa {
164 struct wpa_ft_pmk_r1_sa *next;
165 u8 pmk_r1[PMK_LEN];
166 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
167 u8 spa[ETH_ALEN];
168 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
169 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
170 };
171
172 struct wpa_ft_pmk_cache {
173 struct wpa_ft_pmk_r0_sa *pmk_r0;
174 struct wpa_ft_pmk_r1_sa *pmk_r1;
175 };
176
wpa_ft_pmk_cache_init(void)177 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
178 {
179 struct wpa_ft_pmk_cache *cache;
180
181 cache = os_zalloc(sizeof(*cache));
182
183 return cache;
184 }
185
186
wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache * cache)187 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
188 {
189 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
190 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
191
192 r0 = cache->pmk_r0;
193 while (r0) {
194 r0prev = r0;
195 r0 = r0->next;
196 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
197 os_free(r0prev);
198 }
199
200 r1 = cache->pmk_r1;
201 while (r1) {
202 r1prev = r1;
203 r1 = r1->next;
204 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
205 os_free(r1prev);
206 }
207
208 os_free(cache);
209 }
210
211
wpa_ft_store_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0,const u8 * pmk_r0_name,int pairwise)212 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
213 const u8 *spa, const u8 *pmk_r0,
214 const u8 *pmk_r0_name, int pairwise)
215 {
216 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
217 struct wpa_ft_pmk_r0_sa *r0;
218
219 /* TODO: add expiration and limit on number of entries in cache */
220
221 r0 = os_zalloc(sizeof(*r0));
222 if (r0 == NULL)
223 return -1;
224
225 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
226 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
227 os_memcpy(r0->spa, spa, ETH_ALEN);
228 r0->pairwise = pairwise;
229
230 r0->next = cache->pmk_r0;
231 cache->pmk_r0 = r0;
232
233 return 0;
234 }
235
236
wpa_ft_fetch_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0_name,u8 * pmk_r0,int * pairwise)237 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
238 const u8 *spa, const u8 *pmk_r0_name,
239 u8 *pmk_r0, int *pairwise)
240 {
241 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
242 struct wpa_ft_pmk_r0_sa *r0;
243
244 r0 = cache->pmk_r0;
245 while (r0) {
246 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
247 os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN)
248 == 0) {
249 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
250 if (pairwise)
251 *pairwise = r0->pairwise;
252 return 0;
253 }
254
255 r0 = r0->next;
256 }
257
258 return -1;
259 }
260
261
wpa_ft_store_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1,const u8 * pmk_r1_name,int pairwise)262 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
263 const u8 *spa, const u8 *pmk_r1,
264 const u8 *pmk_r1_name, int pairwise)
265 {
266 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
267 struct wpa_ft_pmk_r1_sa *r1;
268
269 /* TODO: add expiration and limit on number of entries in cache */
270
271 r1 = os_zalloc(sizeof(*r1));
272 if (r1 == NULL)
273 return -1;
274
275 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
276 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
277 os_memcpy(r1->spa, spa, ETH_ALEN);
278 r1->pairwise = pairwise;
279
280 r1->next = cache->pmk_r1;
281 cache->pmk_r1 = r1;
282
283 return 0;
284 }
285
286
wpa_ft_fetch_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1_name,u8 * pmk_r1,int * pairwise)287 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
288 const u8 *spa, const u8 *pmk_r1_name,
289 u8 *pmk_r1, int *pairwise)
290 {
291 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
292 struct wpa_ft_pmk_r1_sa *r1;
293
294 r1 = cache->pmk_r1;
295 while (r1) {
296 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
297 os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN)
298 == 0) {
299 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
300 if (pairwise)
301 *pairwise = r1->pairwise;
302 return 0;
303 }
304
305 r1 = r1->next;
306 }
307
308 return -1;
309 }
310
311
wpa_ft_pull_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * s1kh_id,const u8 * r0kh_id,size_t r0kh_id_len,const u8 * pmk_r0_name)312 static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth,
313 const u8 *s1kh_id, const u8 *r0kh_id,
314 size_t r0kh_id_len, const u8 *pmk_r0_name)
315 {
316 struct ft_remote_r0kh *r0kh;
317 struct ft_r0kh_r1kh_pull_frame frame, f;
318
319 r0kh = wpa_auth->conf.r0kh_list;
320 while (r0kh) {
321 if (r0kh->id_len == r0kh_id_len &&
322 os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0)
323 break;
324 r0kh = r0kh->next;
325 }
326 if (r0kh == NULL)
327 return -1;
328
329 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
330 "address " MACSTR, MAC2STR(r0kh->addr));
331
332 os_memset(&frame, 0, sizeof(frame));
333 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
334 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
335 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
336 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
337
338 /* aes_wrap() does not support inplace encryption, so use a temporary
339 * buffer for the data. */
340 if (random_get_bytes(f.nonce, sizeof(f.nonce))) {
341 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
342 "nonce");
343 return -1;
344 }
345 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
346 os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
347 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
348
349 if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
350 f.nonce, frame.nonce) < 0)
351 return -1;
352
353 wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
354
355 return 0;
356 }
357
358
wpa_auth_derive_ptk_ft(struct wpa_state_machine * sm,const u8 * pmk,struct wpa_ptk * ptk,size_t ptk_len)359 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
360 struct wpa_ptk *ptk, size_t ptk_len)
361 {
362 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
363 u8 pmk_r1[PMK_LEN];
364 u8 ptk_name[WPA_PMK_NAME_LEN];
365 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
366 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
367 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
368 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
369 const u8 *ssid = sm->wpa_auth->conf.ssid;
370 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
371
372
373 if (sm->xxkey_len == 0) {
374 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
375 "derivation");
376 return -1;
377 }
378
379 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
380 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
381 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
382 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
383 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
384 sm->pairwise);
385
386 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
387 pmk_r1, sm->pmk_r1_name);
388 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
389 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
390 WPA_PMK_NAME_LEN);
391 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name,
392 sm->pairwise);
393
394 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
395 sm->wpa_auth->addr, sm->pmk_r1_name,
396 (u8 *) ptk, ptk_len, ptk_name);
397 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
398 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
399
400 return 0;
401 }
402
403
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)404 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
405 const u8 *addr, int idx, u8 *seq)
406 {
407 if (wpa_auth->cb.get_seqnum == NULL)
408 return -1;
409 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
410 }
411
412
wpa_ft_gtk_subelem(struct wpa_state_machine * sm,size_t * len)413 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
414 {
415 u8 *subelem;
416 struct wpa_group *gsm = sm->group;
417 size_t subelem_len, pad_len;
418 const u8 *key;
419 size_t key_len;
420 u8 keybuf[32];
421
422 key_len = gsm->GTK_len;
423 if (key_len > sizeof(keybuf))
424 return NULL;
425
426 /*
427 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
428 * than 16 bytes.
429 */
430 pad_len = key_len % 8;
431 if (pad_len)
432 pad_len = 8 - pad_len;
433 if (key_len + pad_len < 16)
434 pad_len += 8;
435 if (pad_len) {
436 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
437 os_memset(keybuf + key_len, 0, pad_len);
438 keybuf[key_len] = 0xdd;
439 key_len += pad_len;
440 key = keybuf;
441 } else
442 key = gsm->GTK[gsm->GN - 1];
443
444 /*
445 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
446 * Key[5..32].
447 */
448 subelem_len = 13 + key_len + 8;
449 subelem = os_zalloc(subelem_len);
450 if (subelem == NULL)
451 return NULL;
452
453 subelem[0] = FTIE_SUBELEM_GTK;
454 subelem[1] = 11 + key_len + 8;
455 /* Key ID in B0-B1 of Key Info */
456 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
457 subelem[4] = gsm->GTK_len;
458 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
459 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) {
460 os_free(subelem);
461 return NULL;
462 }
463
464 *len = subelem_len;
465 return subelem;
466 }
467
468
469 #ifdef CONFIG_IEEE80211W
wpa_ft_igtk_subelem(struct wpa_state_machine * sm,size_t * len)470 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
471 {
472 u8 *subelem, *pos;
473 struct wpa_group *gsm = sm->group;
474 size_t subelem_len;
475
476 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
477 * Key[16+8] */
478 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
479 subelem = os_zalloc(subelem_len);
480 if (subelem == NULL)
481 return NULL;
482
483 pos = subelem;
484 *pos++ = FTIE_SUBELEM_IGTK;
485 *pos++ = subelem_len - 2;
486 WPA_PUT_LE16(pos, gsm->GN_igtk);
487 pos += 2;
488 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
489 pos += 6;
490 *pos++ = WPA_IGTK_LEN;
491 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8,
492 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
493 os_free(subelem);
494 return NULL;
495 }
496
497 *len = subelem_len;
498 return subelem;
499 }
500 #endif /* CONFIG_IEEE80211W */
501
502
wpa_ft_process_rdie(u8 * pos,u8 * end,u8 id,u8 descr_count,const u8 * ies,size_t ies_len)503 static u8 * wpa_ft_process_rdie(u8 *pos, u8 *end, u8 id, u8 descr_count,
504 const u8 *ies, size_t ies_len)
505 {
506 struct ieee802_11_elems parse;
507 struct rsn_rdie *rdie;
508
509 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
510 id, descr_count);
511 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
512 ies, ies_len);
513
514 if (end - pos < (int) sizeof(*rdie)) {
515 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
516 return pos;
517 }
518
519 *pos++ = WLAN_EID_RIC_DATA;
520 *pos++ = sizeof(*rdie);
521 rdie = (struct rsn_rdie *) pos;
522 rdie->id = id;
523 rdie->descr_count = 0;
524 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
525 pos += sizeof(*rdie);
526
527 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
528 ParseFailed) {
529 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
530 rdie->status_code =
531 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
532 return pos;
533 }
534
535 #ifdef NEED_AP_MLME
536 if (parse.wmm_tspec) {
537 struct wmm_tspec_element *tspec;
538 int res;
539
540 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
541 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
542 "(%d)", (int) parse.wmm_tspec_len);
543 rdie->status_code =
544 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
545 return pos;
546 }
547 if (end - pos < (int) sizeof(*tspec)) {
548 wpa_printf(MSG_ERROR, "FT: Not enough room for "
549 "response TSPEC");
550 rdie->status_code =
551 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
552 return pos;
553 }
554 tspec = (struct wmm_tspec_element *) pos;
555 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
556 res = wmm_process_tspec(tspec);
557 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
558 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
559 rdie->status_code =
560 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
561 else if (res == WMM_ADDTS_STATUS_REFUSED)
562 rdie->status_code =
563 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
564 else {
565 /* TSPEC accepted; include updated TSPEC in response */
566 rdie->descr_count = 1;
567 pos += sizeof(*tspec);
568 }
569 return pos;
570 }
571 #endif /* NEED_AP_MLME */
572
573 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
574 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
575 return pos;
576 }
577
578
wpa_ft_process_ric(u8 * pos,u8 * end,const u8 * ric,size_t ric_len)579 static u8 * wpa_ft_process_ric(u8 *pos, u8 *end, const u8 *ric, size_t ric_len)
580 {
581 const u8 *rpos, *start;
582 const struct rsn_rdie *rdie;
583
584 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
585
586 rpos = ric;
587 while (rpos + sizeof(*rdie) < ric + ric_len) {
588 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
589 rpos + 2 + rpos[1] > ric + ric_len)
590 break;
591 rdie = (const struct rsn_rdie *) (rpos + 2);
592 rpos += 2 + rpos[1];
593 start = rpos;
594
595 while (rpos + 2 <= ric + ric_len &&
596 rpos + 2 + rpos[1] <= ric + ric_len) {
597 if (rpos[0] == WLAN_EID_RIC_DATA)
598 break;
599 rpos += 2 + rpos[1];
600 }
601 pos = wpa_ft_process_rdie(pos, end, rdie->id,
602 rdie->descr_count,
603 start, rpos - start);
604 }
605
606 return pos;
607 }
608
609
wpa_sm_write_assoc_resp_ies(struct wpa_state_machine * sm,u8 * pos,size_t max_len,int auth_alg,const u8 * req_ies,size_t req_ies_len)610 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
611 size_t max_len, int auth_alg,
612 const u8 *req_ies, size_t req_ies_len)
613 {
614 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
615 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
616 int res;
617 struct wpa_auth_config *conf;
618 struct rsn_ftie *_ftie;
619 struct wpa_ft_ies parse;
620 u8 *ric_start;
621 u8 *anonce, *snonce;
622
623 if (sm == NULL)
624 return pos;
625
626 conf = &sm->wpa_auth->conf;
627
628 if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
629 sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK)
630 return pos;
631
632 end = pos + max_len;
633
634 if (auth_alg == WLAN_AUTH_FT) {
635 /*
636 * RSN (only present if this is a Reassociation Response and
637 * part of a fast BSS transition)
638 */
639 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
640 if (res < 0)
641 return pos;
642 rsnie = pos;
643 rsnie_len = res;
644 pos += res;
645 }
646
647 /* Mobility Domain Information */
648 res = wpa_write_mdie(conf, pos, end - pos);
649 if (res < 0)
650 return pos;
651 mdie = pos;
652 mdie_len = res;
653 pos += res;
654
655 /* Fast BSS Transition Information */
656 if (auth_alg == WLAN_AUTH_FT) {
657 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
658 r0kh_id = sm->r0kh_id;
659 r0kh_id_len = sm->r0kh_id_len;
660 anonce = sm->ANonce;
661 snonce = sm->SNonce;
662 #ifdef CONFIG_IEEE80211W
663 if (sm->mgmt_frame_prot) {
664 u8 *igtk;
665 size_t igtk_len;
666 u8 *nbuf;
667 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
668 if (igtk == NULL) {
669 os_free(subelem);
670 return pos;
671 }
672 nbuf = os_realloc(subelem, subelem_len + igtk_len);
673 if (nbuf == NULL) {
674 os_free(subelem);
675 os_free(igtk);
676 return pos;
677 }
678 subelem = nbuf;
679 os_memcpy(subelem + subelem_len, igtk, igtk_len);
680 subelem_len += igtk_len;
681 os_free(igtk);
682 }
683 #endif /* CONFIG_IEEE80211W */
684 } else {
685 r0kh_id = conf->r0_key_holder;
686 r0kh_id_len = conf->r0_key_holder_len;
687 anonce = NULL;
688 snonce = NULL;
689 }
690 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
691 end - pos, subelem, subelem_len);
692 os_free(subelem);
693 if (res < 0)
694 return pos;
695 ftie = pos;
696 ftie_len = res;
697 pos += res;
698
699 os_free(sm->assoc_resp_ftie);
700 sm->assoc_resp_ftie = os_malloc(ftie_len);
701 if (sm->assoc_resp_ftie)
702 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
703
704 _ftie = (struct rsn_ftie *) (ftie + 2);
705 if (auth_alg == WLAN_AUTH_FT)
706 _ftie->mic_control[1] = 3; /* Information element count */
707
708 ric_start = pos;
709 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
710 pos = wpa_ft_process_ric(pos, end, parse.ric, parse.ric_len);
711 if (auth_alg == WLAN_AUTH_FT)
712 _ftie->mic_control[1] +=
713 ieee802_11_ie_count(ric_start,
714 pos - ric_start);
715 }
716 if (ric_start == pos)
717 ric_start = NULL;
718
719 if (auth_alg == WLAN_AUTH_FT &&
720 wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6,
721 mdie, mdie_len, ftie, ftie_len,
722 rsnie, rsnie_len,
723 ric_start, ric_start ? pos - ric_start : 0,
724 _ftie->mic) < 0)
725 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
726
727 return pos;
728 }
729
730
wpa_ft_parse_ftie(const u8 * ie,size_t ie_len,struct wpa_ft_ies * parse)731 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
732 struct wpa_ft_ies *parse)
733 {
734 const u8 *end, *pos;
735
736 parse->ftie = ie;
737 parse->ftie_len = ie_len;
738
739 pos = ie + sizeof(struct rsn_ftie);
740 end = ie + ie_len;
741
742 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
743 switch (pos[0]) {
744 case FTIE_SUBELEM_R1KH_ID:
745 if (pos[1] != FT_R1KH_ID_LEN) {
746 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
747 "length in FTIE: %d", pos[1]);
748 return -1;
749 }
750 parse->r1kh_id = pos + 2;
751 break;
752 case FTIE_SUBELEM_GTK:
753 parse->gtk = pos + 2;
754 parse->gtk_len = pos[1];
755 break;
756 case FTIE_SUBELEM_R0KH_ID:
757 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
758 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
759 "length in FTIE: %d", pos[1]);
760 return -1;
761 }
762 parse->r0kh_id = pos + 2;
763 parse->r0kh_id_len = pos[1];
764 break;
765 }
766
767 pos += 2 + pos[1];
768 }
769
770 return 0;
771 }
772
773
wpa_ft_parse_ies(const u8 * ies,size_t ies_len,struct wpa_ft_ies * parse)774 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
775 struct wpa_ft_ies *parse)
776 {
777 const u8 *end, *pos;
778 struct wpa_ie_data data;
779 int ret;
780 const struct rsn_ftie *ftie;
781 int prot_ie_count = 0;
782
783 os_memset(parse, 0, sizeof(*parse));
784 if (ies == NULL)
785 return 0;
786
787 pos = ies;
788 end = ies + ies_len;
789 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
790 switch (pos[0]) {
791 case WLAN_EID_RSN:
792 parse->rsn = pos + 2;
793 parse->rsn_len = pos[1];
794 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
795 parse->rsn_len + 2,
796 &data);
797 if (ret < 0) {
798 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
799 "RSN IE: %d", ret);
800 return -1;
801 }
802 if (data.num_pmkid == 1 && data.pmkid)
803 parse->rsn_pmkid = data.pmkid;
804 break;
805 case WLAN_EID_MOBILITY_DOMAIN:
806 parse->mdie = pos + 2;
807 parse->mdie_len = pos[1];
808 break;
809 case WLAN_EID_FAST_BSS_TRANSITION:
810 if (pos[1] < sizeof(*ftie))
811 return -1;
812 ftie = (const struct rsn_ftie *) (pos + 2);
813 prot_ie_count = ftie->mic_control[1];
814 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
815 return -1;
816 break;
817 case WLAN_EID_RIC_DATA:
818 if (parse->ric == NULL)
819 parse->ric = pos;
820 }
821
822 pos += 2 + pos[1];
823 }
824
825 if (prot_ie_count == 0)
826 return 0; /* no MIC */
827
828 /*
829 * Check that the protected IE count matches with IEs included in the
830 * frame.
831 */
832 if (parse->rsn)
833 prot_ie_count--;
834 if (parse->mdie)
835 prot_ie_count--;
836 if (parse->ftie)
837 prot_ie_count--;
838 if (prot_ie_count < 0) {
839 wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in "
840 "the protected IE count");
841 return -1;
842 }
843
844 if (prot_ie_count == 0 && parse->ric) {
845 wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not "
846 "included in protected IE count");
847 return -1;
848 }
849
850 /* Determine the end of the RIC IE(s) */
851 pos = parse->ric;
852 while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end &&
853 prot_ie_count) {
854 prot_ie_count--;
855 pos += 2 + pos[1];
856 }
857 parse->ric_len = pos - parse->ric;
858 if (prot_ie_count) {
859 wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from "
860 "frame", (int) prot_ie_count);
861 return -1;
862 }
863
864 return 0;
865 }
866
867
wpa_auth_set_key(struct wpa_authenticator * wpa_auth,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len)868 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
869 int vlan_id,
870 enum wpa_alg alg, const u8 *addr, int idx,
871 u8 *key, size_t key_len)
872 {
873 if (wpa_auth->cb.set_key == NULL)
874 return -1;
875 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
876 key, key_len);
877 }
878
879
wpa_ft_install_ptk(struct wpa_state_machine * sm)880 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
881 {
882 enum wpa_alg alg;
883 int klen;
884
885 /* MLME-SETKEYS.request(PTK) */
886 if (sm->pairwise == WPA_CIPHER_TKIP) {
887 alg = WPA_ALG_TKIP;
888 klen = 32;
889 } else if (sm->pairwise == WPA_CIPHER_CCMP) {
890 alg = WPA_ALG_CCMP;
891 klen = 16;
892 } else {
893 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
894 "PTK configuration", sm->pairwise);
895 return;
896 }
897
898 /* FIX: add STA entry to kernel/driver here? The set_key will fail
899 * most likely without this.. At the moment, STA entry is added only
900 * after association has been completed. This function will be called
901 * again after association to get the PTK configured, but that could be
902 * optimized by adding the STA entry earlier.
903 */
904 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
905 sm->PTK.tk1, klen))
906 return;
907
908 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
909 sm->pairwise_set = TRUE;
910 }
911
912
wpa_ft_process_auth_req(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len,u8 ** resp_ies,size_t * resp_ies_len)913 static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
914 const u8 *ies, size_t ies_len,
915 u8 **resp_ies, size_t *resp_ies_len)
916 {
917 struct rsn_mdie *mdie;
918 struct rsn_ftie *ftie;
919 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
920 u8 ptk_name[WPA_PMK_NAME_LEN];
921 struct wpa_auth_config *conf;
922 struct wpa_ft_ies parse;
923 size_t buflen, ptk_len;
924 int ret;
925 u8 *pos, *end;
926 int pairwise;
927
928 *resp_ies = NULL;
929 *resp_ies_len = 0;
930
931 sm->pmk_r1_name_valid = 0;
932 conf = &sm->wpa_auth->conf;
933
934 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
935 ies, ies_len);
936
937 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
938 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
939 return WLAN_STATUS_UNSPECIFIED_FAILURE;
940 }
941
942 mdie = (struct rsn_mdie *) parse.mdie;
943 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
944 os_memcmp(mdie->mobility_domain,
945 sm->wpa_auth->conf.mobility_domain,
946 MOBILITY_DOMAIN_ID_LEN) != 0) {
947 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
948 return WLAN_STATUS_INVALID_MDIE;
949 }
950
951 ftie = (struct rsn_ftie *) parse.ftie;
952 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
953 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
954 return WLAN_STATUS_INVALID_FTIE;
955 }
956
957 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
958
959 if (parse.r0kh_id == NULL) {
960 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
961 return WLAN_STATUS_INVALID_FTIE;
962 }
963
964 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
965 parse.r0kh_id, parse.r0kh_id_len);
966 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
967 sm->r0kh_id_len = parse.r0kh_id_len;
968
969 if (parse.rsn_pmkid == NULL) {
970 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
971 return WLAN_STATUS_INVALID_PMKID;
972 }
973
974 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
975 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
976 wpa_derive_pmk_r1_name(parse.rsn_pmkid,
977 sm->wpa_auth->conf.r1_key_holder, sm->addr,
978 pmk_r1_name);
979 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
980 pmk_r1_name, WPA_PMK_NAME_LEN);
981
982 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1,
983 &pairwise) < 0) {
984 if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id,
985 sm->r0kh_id_len, parse.rsn_pmkid) < 0) {
986 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
987 "PMK-R1 and unknown R0KH-ID");
988 return WLAN_STATUS_INVALID_PMKID;
989 }
990
991 /*
992 * TODO: Should return "status pending" (and the caller should
993 * not send out response now). The real response will be sent
994 * once the response from R0KH is received.
995 */
996 return WLAN_STATUS_INVALID_PMKID;
997 }
998
999 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
1000 sm->pmk_r1_name_valid = 1;
1001 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
1002
1003 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1004 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
1005 "ANonce");
1006 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1007 }
1008
1009 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1010 sm->SNonce, WPA_NONCE_LEN);
1011 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
1012 sm->ANonce, WPA_NONCE_LEN);
1013
1014 ptk_len = pairwise != WPA_CIPHER_CCMP ? 64 : 48;
1015 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
1016 sm->wpa_auth->addr, pmk_r1_name,
1017 (u8 *) &sm->PTK, ptk_len, ptk_name);
1018 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
1019 (u8 *) &sm->PTK, ptk_len);
1020 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
1021
1022 sm->pairwise = pairwise;
1023 wpa_ft_install_ptk(sm);
1024
1025 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
1026 2 + FT_R1KH_ID_LEN + 200;
1027 *resp_ies = os_zalloc(buflen);
1028 if (*resp_ies == NULL) {
1029 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1030 }
1031
1032 pos = *resp_ies;
1033 end = *resp_ies + buflen;
1034
1035 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
1036 if (ret < 0) {
1037 os_free(*resp_ies);
1038 *resp_ies = NULL;
1039 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1040 }
1041 pos += ret;
1042
1043 ret = wpa_write_mdie(conf, pos, end - pos);
1044 if (ret < 0) {
1045 os_free(*resp_ies);
1046 *resp_ies = NULL;
1047 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1048 }
1049 pos += ret;
1050
1051 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
1052 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
1053 if (ret < 0) {
1054 os_free(*resp_ies);
1055 *resp_ies = NULL;
1056 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1057 }
1058 pos += ret;
1059
1060 *resp_ies_len = pos - *resp_ies;
1061
1062 return WLAN_STATUS_SUCCESS;
1063 }
1064
1065
wpa_ft_process_auth(struct wpa_state_machine * sm,const u8 * bssid,u16 auth_transaction,const u8 * ies,size_t ies_len,void (* cb)(void * ctx,const u8 * dst,const u8 * bssid,u16 auth_transaction,u16 status,const u8 * ies,size_t ies_len),void * ctx)1066 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
1067 u16 auth_transaction, const u8 *ies, size_t ies_len,
1068 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
1069 u16 auth_transaction, u16 status,
1070 const u8 *ies, size_t ies_len),
1071 void *ctx)
1072 {
1073 u16 status;
1074 u8 *resp_ies;
1075 size_t resp_ies_len;
1076
1077 if (sm == NULL) {
1078 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
1079 "WPA SM not available");
1080 return;
1081 }
1082
1083 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
1084 " BSSID=" MACSTR " transaction=%d",
1085 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
1086 status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
1087 &resp_ies_len);
1088
1089 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
1090 " auth_transaction=%d status=%d",
1091 MAC2STR(sm->addr), auth_transaction + 1, status);
1092 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1093 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
1094 resp_ies, resp_ies_len);
1095 os_free(resp_ies);
1096 }
1097
1098
wpa_ft_validate_reassoc(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)1099 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
1100 size_t ies_len)
1101 {
1102 struct wpa_ft_ies parse;
1103 struct rsn_mdie *mdie;
1104 struct rsn_ftie *ftie;
1105 u8 mic[16];
1106 unsigned int count;
1107
1108 if (sm == NULL)
1109 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1110
1111 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
1112
1113 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
1114 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
1115 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1116 }
1117
1118 if (parse.rsn == NULL) {
1119 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
1120 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1121 }
1122
1123 if (parse.rsn_pmkid == NULL) {
1124 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
1125 return WLAN_STATUS_INVALID_PMKID;
1126 }
1127
1128 if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
1129 {
1130 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
1131 "with the PMKR1Name derived from auth request");
1132 return WLAN_STATUS_INVALID_PMKID;
1133 }
1134
1135 mdie = (struct rsn_mdie *) parse.mdie;
1136 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1137 os_memcmp(mdie->mobility_domain,
1138 sm->wpa_auth->conf.mobility_domain,
1139 MOBILITY_DOMAIN_ID_LEN) != 0) {
1140 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1141 return WLAN_STATUS_INVALID_MDIE;
1142 }
1143
1144 ftie = (struct rsn_ftie *) parse.ftie;
1145 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1146 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1147 return WLAN_STATUS_INVALID_FTIE;
1148 }
1149
1150 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
1151 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1152 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1153 ftie->snonce, WPA_NONCE_LEN);
1154 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1155 sm->SNonce, WPA_NONCE_LEN);
1156 return -1;
1157 }
1158
1159 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
1160 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1161 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1162 ftie->anonce, WPA_NONCE_LEN);
1163 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1164 sm->ANonce, WPA_NONCE_LEN);
1165 return -1;
1166 }
1167
1168
1169 if (parse.r0kh_id == NULL) {
1170 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1171 return -1;
1172 }
1173
1174 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1175 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
1176 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1177 "the current R0KH-ID");
1178 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1179 parse.r0kh_id, parse.r0kh_id_len);
1180 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1181 sm->r0kh_id, sm->r0kh_id_len);
1182 return -1;
1183 }
1184
1185 if (parse.r1kh_id == NULL) {
1186 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1187 return -1;
1188 }
1189
1190 if (os_memcmp(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
1191 FT_R1KH_ID_LEN) != 0) {
1192 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1193 "ReassocReq");
1194 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
1195 parse.r1kh_id, FT_R1KH_ID_LEN);
1196 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
1197 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
1198 return -1;
1199 }
1200
1201 if (parse.rsn_pmkid == NULL ||
1202 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
1203 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1204 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1205 return -1;
1206 }
1207
1208 count = 3;
1209 if (parse.ric)
1210 count++;
1211 if (ftie->mic_control[1] != count) {
1212 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1213 "Control: received %u expected %u",
1214 ftie->mic_control[1], count);
1215 return -1;
1216 }
1217
1218 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5,
1219 parse.mdie - 2, parse.mdie_len + 2,
1220 parse.ftie - 2, parse.ftie_len + 2,
1221 parse.rsn - 2, parse.rsn_len + 2,
1222 parse.ric, parse.ric_len,
1223 mic) < 0) {
1224 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1225 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1226 }
1227
1228 if (os_memcmp(mic, ftie->mic, 16) != 0) {
1229 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1230 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
1231 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
1232 return WLAN_STATUS_INVALID_FTIE;
1233 }
1234
1235 return WLAN_STATUS_SUCCESS;
1236 }
1237
1238
wpa_ft_action_rx(struct wpa_state_machine * sm,const u8 * data,size_t len)1239 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1240 {
1241 const u8 *sta_addr, *target_ap;
1242 const u8 *ies;
1243 size_t ies_len;
1244 u8 action;
1245 struct ft_rrb_frame *frame;
1246
1247 if (sm == NULL)
1248 return -1;
1249
1250 /*
1251 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1252 * FT Request action frame body[variable]
1253 */
1254
1255 if (len < 14) {
1256 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1257 "(len=%lu)", (unsigned long) len);
1258 return -1;
1259 }
1260
1261 action = data[1];
1262 sta_addr = data + 2;
1263 target_ap = data + 8;
1264 ies = data + 14;
1265 ies_len = len - 14;
1266
1267 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1268 " Target AP=" MACSTR " Action=%d)",
1269 MAC2STR(sta_addr), MAC2STR(target_ap), action);
1270
1271 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1272 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1273 "STA=" MACSTR " STA-Address=" MACSTR,
1274 MAC2STR(sm->addr), MAC2STR(sta_addr));
1275 return -1;
1276 }
1277
1278 /*
1279 * Do some sanity checking on the target AP address (not own and not
1280 * broadcast. This could be extended to filter based on a list of known
1281 * APs in the MD (if such a list were configured).
1282 */
1283 if ((target_ap[0] & 0x01) ||
1284 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1285 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1286 "frame");
1287 return -1;
1288 }
1289
1290 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1291
1292 /* RRB - Forward action frame to the target AP */
1293 frame = os_malloc(sizeof(*frame) + len);
1294 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1295 frame->packet_type = FT_PACKET_REQUEST;
1296 frame->action_length = host_to_le16(len);
1297 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1298 os_memcpy(frame + 1, data, len);
1299
1300 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1301 sizeof(*frame) + len);
1302 os_free(frame);
1303
1304 return 0;
1305 }
1306
1307
wpa_ft_rrb_rx_request(struct wpa_authenticator * wpa_auth,const u8 * current_ap,const u8 * sta_addr,const u8 * body,size_t len)1308 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1309 const u8 *current_ap, const u8 *sta_addr,
1310 const u8 *body, size_t len)
1311 {
1312 struct wpa_state_machine *sm;
1313 u16 status;
1314 u8 *resp_ies, *pos;
1315 size_t resp_ies_len, rlen;
1316 struct ft_rrb_frame *frame;
1317
1318 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1319 if (sm == NULL) {
1320 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1321 "RRB Request");
1322 return -1;
1323 }
1324
1325 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1326
1327 status = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1328 &resp_ies_len);
1329
1330 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1331 " CurrentAP=" MACSTR " status=%d",
1332 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1333 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1334
1335 /* RRB - Forward action frame response to the Current AP */
1336
1337 /*
1338 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1339 * Status_Code[2] FT Request action frame body[variable]
1340 */
1341 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1342
1343 frame = os_malloc(sizeof(*frame) + rlen);
1344 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1345 frame->packet_type = FT_PACKET_RESPONSE;
1346 frame->action_length = host_to_le16(rlen);
1347 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1348 pos = (u8 *) (frame + 1);
1349 *pos++ = WLAN_ACTION_FT;
1350 *pos++ = 2; /* Action: Response */
1351 os_memcpy(pos, sta_addr, ETH_ALEN);
1352 pos += ETH_ALEN;
1353 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1354 pos += ETH_ALEN;
1355 WPA_PUT_LE16(pos, status);
1356 pos += 2;
1357 if (resp_ies) {
1358 os_memcpy(pos, resp_ies, resp_ies_len);
1359 os_free(resp_ies);
1360 }
1361
1362 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1363 sizeof(*frame) + rlen);
1364 os_free(frame);
1365
1366 return 0;
1367 }
1368
1369
wpa_ft_rrb_rx_pull(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1370 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1371 const u8 *src_addr,
1372 const u8 *data, size_t data_len)
1373 {
1374 struct ft_r0kh_r1kh_pull_frame *frame, f;
1375 struct ft_remote_r1kh *r1kh;
1376 struct ft_r0kh_r1kh_resp_frame resp, r;
1377 u8 pmk_r0[PMK_LEN];
1378 int pairwise;
1379
1380 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1381
1382 if (data_len < sizeof(*frame))
1383 return -1;
1384
1385 r1kh = wpa_auth->conf.r1kh_list;
1386 while (r1kh) {
1387 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1388 break;
1389 r1kh = r1kh->next;
1390 }
1391 if (r1kh == NULL) {
1392 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1393 "PMK-R1 pull source address " MACSTR,
1394 MAC2STR(src_addr));
1395 return -1;
1396 }
1397
1398 frame = (struct ft_r0kh_r1kh_pull_frame *) data;
1399 /* aes_unwrap() does not support inplace decryption, so use a temporary
1400 * buffer for the data. */
1401 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1402 frame->nonce, f.nonce) < 0) {
1403 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1404 "request from " MACSTR, MAC2STR(src_addr));
1405 return -1;
1406 }
1407
1408 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1409 f.nonce, sizeof(f.nonce));
1410 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1411 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1412 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1413 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1414
1415 os_memset(&resp, 0, sizeof(resp));
1416 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1417 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1418 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1419 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1420
1421 /* aes_wrap() does not support inplace encryption, so use a temporary
1422 * buffer for the data. */
1423 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1424 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1425 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1426 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1427 &pairwise) < 0) {
1428 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1429 "PMK-R1 pull");
1430 return -1;
1431 }
1432
1433 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1434 r.pmk_r1, r.pmk_r1_name);
1435 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1436 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1437 WPA_PMK_NAME_LEN);
1438 r.pairwise = host_to_le16(pairwise);
1439
1440 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1441 r.nonce, resp.nonce) < 0) {
1442 os_memset(pmk_r0, 0, PMK_LEN);
1443 return -1;
1444 }
1445
1446 os_memset(pmk_r0, 0, PMK_LEN);
1447
1448 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1449
1450 return 0;
1451 }
1452
1453
wpa_ft_rrb_rx_resp(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1454 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1455 const u8 *src_addr,
1456 const u8 *data, size_t data_len)
1457 {
1458 struct ft_r0kh_r1kh_resp_frame *frame, f;
1459 struct ft_remote_r0kh *r0kh;
1460 int pairwise;
1461
1462 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1463
1464 if (data_len < sizeof(*frame))
1465 return -1;
1466
1467 r0kh = wpa_auth->conf.r0kh_list;
1468 while (r0kh) {
1469 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1470 break;
1471 r0kh = r0kh->next;
1472 }
1473 if (r0kh == NULL) {
1474 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1475 "PMK-R0 pull response source address " MACSTR,
1476 MAC2STR(src_addr));
1477 return -1;
1478 }
1479
1480 frame = (struct ft_r0kh_r1kh_resp_frame *) data;
1481 /* aes_unwrap() does not support inplace decryption, so use a temporary
1482 * buffer for the data. */
1483 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1484 frame->nonce, f.nonce) < 0) {
1485 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1486 "response from " MACSTR, MAC2STR(src_addr));
1487 return -1;
1488 }
1489
1490 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1491 != 0) {
1492 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1493 "matching R1KH-ID");
1494 return -1;
1495 }
1496
1497 /* TODO: verify that <nonce,s1kh_id> matches with a pending request
1498 * and call this requests callback function to finish request
1499 * processing */
1500
1501 pairwise = le_to_host16(f.pairwise);
1502 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1503 f.nonce, sizeof(f.nonce));
1504 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1505 MACSTR " pairwise=0x%x",
1506 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1507 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1508 f.pmk_r1, PMK_LEN);
1509 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1510 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1511
1512 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1513 pairwise);
1514 os_memset(f.pmk_r1, 0, PMK_LEN);
1515
1516 return 0;
1517 }
1518
1519
wpa_ft_rrb_rx_push(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1520 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1521 const u8 *src_addr,
1522 const u8 *data, size_t data_len)
1523 {
1524 struct ft_r0kh_r1kh_push_frame *frame, f;
1525 struct ft_remote_r0kh *r0kh;
1526 struct os_time now;
1527 os_time_t tsend;
1528 int pairwise;
1529
1530 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1531
1532 if (data_len < sizeof(*frame))
1533 return -1;
1534
1535 r0kh = wpa_auth->conf.r0kh_list;
1536 while (r0kh) {
1537 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1538 break;
1539 r0kh = r0kh->next;
1540 }
1541 if (r0kh == NULL) {
1542 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1543 "PMK-R0 push source address " MACSTR,
1544 MAC2STR(src_addr));
1545 return -1;
1546 }
1547
1548 frame = (struct ft_r0kh_r1kh_push_frame *) data;
1549 /* aes_unwrap() does not support inplace decryption, so use a temporary
1550 * buffer for the data. */
1551 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1552 frame->timestamp, f.timestamp) < 0) {
1553 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1554 MACSTR, MAC2STR(src_addr));
1555 return -1;
1556 }
1557
1558 os_get_time(&now);
1559 tsend = WPA_GET_LE32(f.timestamp);
1560 if ((now.sec > tsend && now.sec - tsend > 60) ||
1561 (now.sec < tsend && tsend - now.sec > 60)) {
1562 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1563 "timestamp: sender time %d own time %d\n",
1564 (int) tsend, (int) now.sec);
1565 return -1;
1566 }
1567
1568 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1569 != 0) {
1570 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1571 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1572 MAC2STR(f.r1kh_id),
1573 MAC2STR(wpa_auth->conf.r1_key_holder));
1574 return -1;
1575 }
1576
1577 pairwise = le_to_host16(f.pairwise);
1578 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1579 MACSTR " pairwise=0x%x",
1580 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1581 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1582 f.pmk_r1, PMK_LEN);
1583 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1584 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1585
1586 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1587 pairwise);
1588 os_memset(f.pmk_r1, 0, PMK_LEN);
1589
1590 return 0;
1591 }
1592
1593
wpa_ft_rrb_rx(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1594 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1595 const u8 *data, size_t data_len)
1596 {
1597 struct ft_rrb_frame *frame;
1598 u16 alen;
1599 const u8 *pos, *end, *start;
1600 u8 action;
1601 const u8 *sta_addr, *target_ap_addr;
1602
1603 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1604 MAC2STR(src_addr));
1605
1606 if (data_len < sizeof(*frame)) {
1607 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1608 (unsigned long) data_len);
1609 return -1;
1610 }
1611
1612 pos = data;
1613 frame = (struct ft_rrb_frame *) pos;
1614 pos += sizeof(*frame);
1615
1616 alen = le_to_host16(frame->action_length);
1617 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1618 "action_length=%d ap_address=" MACSTR,
1619 frame->frame_type, frame->packet_type, alen,
1620 MAC2STR(frame->ap_address));
1621
1622 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1623 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1624 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1625 "unrecognized type %d", frame->frame_type);
1626 return -1;
1627 }
1628
1629 if (alen > data_len - sizeof(*frame)) {
1630 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1631 "frame");
1632 return -1;
1633 }
1634
1635 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1636 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1637 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1638 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1639 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1640 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1641
1642 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1643
1644 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1645 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1646 "room for Action Frame body); alen=%lu",
1647 (unsigned long) alen);
1648 return -1;
1649 }
1650 start = pos;
1651 end = pos + alen;
1652
1653 if (*pos != WLAN_ACTION_FT) {
1654 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1655 "%d", *pos);
1656 return -1;
1657 }
1658
1659 pos++;
1660 action = *pos++;
1661 sta_addr = pos;
1662 pos += ETH_ALEN;
1663 target_ap_addr = pos;
1664 pos += ETH_ALEN;
1665 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1666 MACSTR " target_ap_addr=" MACSTR,
1667 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1668
1669 if (frame->packet_type == FT_PACKET_REQUEST) {
1670 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1671
1672 if (action != 1) {
1673 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1674 "RRB Request", action);
1675 return -1;
1676 }
1677
1678 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1679 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1680 "RRB Request does not match with own "
1681 "address");
1682 return -1;
1683 }
1684
1685 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1686 sta_addr, pos, end - pos) < 0)
1687 return -1;
1688 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1689 u16 status_code;
1690
1691 if (end - pos < 2) {
1692 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1693 "code in RRB Response");
1694 return -1;
1695 }
1696 status_code = WPA_GET_LE16(pos);
1697 pos += 2;
1698
1699 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1700 "(status_code=%d)", status_code);
1701
1702 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1703 return -1;
1704 } else {
1705 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1706 "packet_type %d", frame->packet_type);
1707 return -1;
1708 }
1709
1710 return 0;
1711 }
1712
1713
wpa_ft_generate_pmk_r1(struct wpa_authenticator * wpa_auth,struct wpa_ft_pmk_r0_sa * pmk_r0,struct ft_remote_r1kh * r1kh,const u8 * s1kh_id,int pairwise)1714 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1715 struct wpa_ft_pmk_r0_sa *pmk_r0,
1716 struct ft_remote_r1kh *r1kh,
1717 const u8 *s1kh_id, int pairwise)
1718 {
1719 struct ft_r0kh_r1kh_push_frame frame, f;
1720 struct os_time now;
1721
1722 os_memset(&frame, 0, sizeof(frame));
1723 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1724 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1725 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1726 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1727
1728 /* aes_wrap() does not support inplace encryption, so use a temporary
1729 * buffer for the data. */
1730 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1731 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1732 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1733 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1734 s1kh_id, f.pmk_r1, f.pmk_r1_name);
1735 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1736 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1737 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1738 WPA_PMK_NAME_LEN);
1739 os_get_time(&now);
1740 WPA_PUT_LE32(f.timestamp, now.sec);
1741 f.pairwise = host_to_le16(pairwise);
1742 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1743 f.timestamp, frame.timestamp) < 0)
1744 return;
1745
1746 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1747 }
1748
1749
wpa_ft_push_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * addr)1750 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1751 {
1752 struct wpa_ft_pmk_r0_sa *r0;
1753 struct ft_remote_r1kh *r1kh;
1754
1755 if (!wpa_auth->conf.pmk_r1_push)
1756 return;
1757
1758 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1759 while (r0) {
1760 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1761 break;
1762 r0 = r0->next;
1763 }
1764
1765 if (r0 == NULL || r0->pmk_r1_pushed)
1766 return;
1767 r0->pmk_r1_pushed = 1;
1768
1769 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1770 "for STA " MACSTR, MAC2STR(addr));
1771
1772 r1kh = wpa_auth->conf.r1kh_list;
1773 while (r1kh) {
1774 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1775 r1kh = r1kh->next;
1776 }
1777 }
1778
1779 #endif /* CONFIG_IEEE80211R */
1780