1 /*
2 * hostapd - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2004-2009, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "common/ieee802_11_defs.h"
13 #include "common/ieee802_11_common.h"
14 #include "crypto/aes_wrap.h"
15 #include "crypto/random.h"
16 #include "ap_config.h"
17 #include "ieee802_11.h"
18 #include "wmm.h"
19 #include "wpa_auth.h"
20 #include "wpa_auth_i.h"
21
22
23 #ifdef CONFIG_IEEE80211R
24
wpa_ft_rrb_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)25 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
26 const u8 *data, size_t data_len)
27 {
28 if (wpa_auth->cb.send_ether == NULL)
29 return -1;
30 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
31 return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
32 data, data_len);
33 }
34
35
wpa_ft_action_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)36 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
37 const u8 *dst, const u8 *data, size_t data_len)
38 {
39 if (wpa_auth->cb.send_ft_action == NULL)
40 return -1;
41 return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
42 data, data_len);
43 }
44
45
46 static struct wpa_state_machine *
wpa_ft_add_sta(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)47 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
48 {
49 if (wpa_auth->cb.add_sta == NULL)
50 return NULL;
51 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
52 }
53
54
wpa_ft_add_tspec(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,u8 * tspec_ie,size_t tspec_ielen)55 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
56 const u8 *sta_addr,
57 u8 *tspec_ie, size_t tspec_ielen)
58 {
59 if (wpa_auth->cb.add_tspec == NULL) {
60 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
61 return -1;
62 }
63 return wpa_auth->cb.add_tspec(wpa_auth->cb.ctx, sta_addr, tspec_ie,
64 tspec_ielen);
65 }
66
67
wpa_write_mdie(struct wpa_auth_config * conf,u8 * buf,size_t len)68 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
69 {
70 u8 *pos = buf;
71 u8 capab;
72 if (len < 2 + sizeof(struct rsn_mdie))
73 return -1;
74
75 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
76 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
77 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
78 pos += MOBILITY_DOMAIN_ID_LEN;
79 capab = 0;
80 if (conf->ft_over_ds)
81 capab |= RSN_FT_CAPAB_FT_OVER_DS;
82 *pos++ = capab;
83
84 return pos - buf;
85 }
86
87
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)88 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
89 size_t r0kh_id_len,
90 const u8 *anonce, const u8 *snonce,
91 u8 *buf, size_t len, const u8 *subelem,
92 size_t subelem_len)
93 {
94 u8 *pos = buf, *ielen;
95 struct rsn_ftie *hdr;
96
97 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
98 subelem_len)
99 return -1;
100
101 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
102 ielen = pos++;
103
104 hdr = (struct rsn_ftie *) pos;
105 os_memset(hdr, 0, sizeof(*hdr));
106 pos += sizeof(*hdr);
107 WPA_PUT_LE16(hdr->mic_control, 0);
108 if (anonce)
109 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
110 if (snonce)
111 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
112
113 /* Optional Parameters */
114 *pos++ = FTIE_SUBELEM_R1KH_ID;
115 *pos++ = FT_R1KH_ID_LEN;
116 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
117 pos += FT_R1KH_ID_LEN;
118
119 if (r0kh_id) {
120 *pos++ = FTIE_SUBELEM_R0KH_ID;
121 *pos++ = r0kh_id_len;
122 os_memcpy(pos, r0kh_id, r0kh_id_len);
123 pos += r0kh_id_len;
124 }
125
126 if (subelem) {
127 os_memcpy(pos, subelem, subelem_len);
128 pos += subelem_len;
129 }
130
131 *ielen = pos - buf - 2;
132
133 return pos - buf;
134 }
135
136
137 struct wpa_ft_pmk_r0_sa {
138 struct wpa_ft_pmk_r0_sa *next;
139 u8 pmk_r0[PMK_LEN];
140 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
141 u8 spa[ETH_ALEN];
142 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
143 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
144 int pmk_r1_pushed;
145 };
146
147 struct wpa_ft_pmk_r1_sa {
148 struct wpa_ft_pmk_r1_sa *next;
149 u8 pmk_r1[PMK_LEN];
150 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
151 u8 spa[ETH_ALEN];
152 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
153 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
154 };
155
156 struct wpa_ft_pmk_cache {
157 struct wpa_ft_pmk_r0_sa *pmk_r0;
158 struct wpa_ft_pmk_r1_sa *pmk_r1;
159 };
160
wpa_ft_pmk_cache_init(void)161 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
162 {
163 struct wpa_ft_pmk_cache *cache;
164
165 cache = os_zalloc(sizeof(*cache));
166
167 return cache;
168 }
169
170
wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache * cache)171 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
172 {
173 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
174 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
175
176 r0 = cache->pmk_r0;
177 while (r0) {
178 r0prev = r0;
179 r0 = r0->next;
180 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
181 os_free(r0prev);
182 }
183
184 r1 = cache->pmk_r1;
185 while (r1) {
186 r1prev = r1;
187 r1 = r1->next;
188 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
189 os_free(r1prev);
190 }
191
192 os_free(cache);
193 }
194
195
wpa_ft_store_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0,const u8 * pmk_r0_name,int pairwise)196 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
197 const u8 *spa, const u8 *pmk_r0,
198 const u8 *pmk_r0_name, int pairwise)
199 {
200 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
201 struct wpa_ft_pmk_r0_sa *r0;
202
203 /* TODO: add expiration and limit on number of entries in cache */
204
205 r0 = os_zalloc(sizeof(*r0));
206 if (r0 == NULL)
207 return -1;
208
209 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
210 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
211 os_memcpy(r0->spa, spa, ETH_ALEN);
212 r0->pairwise = pairwise;
213
214 r0->next = cache->pmk_r0;
215 cache->pmk_r0 = r0;
216
217 return 0;
218 }
219
220
wpa_ft_fetch_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0_name,u8 * pmk_r0,int * pairwise)221 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
222 const u8 *spa, const u8 *pmk_r0_name,
223 u8 *pmk_r0, int *pairwise)
224 {
225 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
226 struct wpa_ft_pmk_r0_sa *r0;
227
228 r0 = cache->pmk_r0;
229 while (r0) {
230 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
231 os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN)
232 == 0) {
233 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
234 if (pairwise)
235 *pairwise = r0->pairwise;
236 return 0;
237 }
238
239 r0 = r0->next;
240 }
241
242 return -1;
243 }
244
245
wpa_ft_store_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1,const u8 * pmk_r1_name,int pairwise)246 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
247 const u8 *spa, const u8 *pmk_r1,
248 const u8 *pmk_r1_name, int pairwise)
249 {
250 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
251 struct wpa_ft_pmk_r1_sa *r1;
252
253 /* TODO: add expiration and limit on number of entries in cache */
254
255 r1 = os_zalloc(sizeof(*r1));
256 if (r1 == NULL)
257 return -1;
258
259 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
260 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
261 os_memcpy(r1->spa, spa, ETH_ALEN);
262 r1->pairwise = pairwise;
263
264 r1->next = cache->pmk_r1;
265 cache->pmk_r1 = r1;
266
267 return 0;
268 }
269
270
wpa_ft_fetch_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1_name,u8 * pmk_r1,int * pairwise)271 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
272 const u8 *spa, const u8 *pmk_r1_name,
273 u8 *pmk_r1, int *pairwise)
274 {
275 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
276 struct wpa_ft_pmk_r1_sa *r1;
277
278 r1 = cache->pmk_r1;
279 while (r1) {
280 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
281 os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN)
282 == 0) {
283 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
284 if (pairwise)
285 *pairwise = r1->pairwise;
286 return 0;
287 }
288
289 r1 = r1->next;
290 }
291
292 return -1;
293 }
294
295
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)296 static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth,
297 const u8 *s1kh_id, const u8 *r0kh_id,
298 size_t r0kh_id_len, const u8 *pmk_r0_name)
299 {
300 struct ft_remote_r0kh *r0kh;
301 struct ft_r0kh_r1kh_pull_frame frame, f;
302
303 r0kh = wpa_auth->conf.r0kh_list;
304 while (r0kh) {
305 if (r0kh->id_len == r0kh_id_len &&
306 os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0)
307 break;
308 r0kh = r0kh->next;
309 }
310 if (r0kh == NULL)
311 return -1;
312
313 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
314 "address " MACSTR, MAC2STR(r0kh->addr));
315
316 os_memset(&frame, 0, sizeof(frame));
317 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
318 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
319 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
320 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
321
322 /* aes_wrap() does not support inplace encryption, so use a temporary
323 * buffer for the data. */
324 if (random_get_bytes(f.nonce, sizeof(f.nonce))) {
325 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
326 "nonce");
327 return -1;
328 }
329 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
330 os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
331 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
332
333 if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
334 f.nonce, frame.nonce) < 0)
335 return -1;
336
337 wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
338
339 return 0;
340 }
341
342
wpa_auth_derive_ptk_ft(struct wpa_state_machine * sm,const u8 * pmk,struct wpa_ptk * ptk,size_t ptk_len)343 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
344 struct wpa_ptk *ptk, size_t ptk_len)
345 {
346 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
347 u8 pmk_r1[PMK_LEN];
348 u8 ptk_name[WPA_PMK_NAME_LEN];
349 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
350 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
351 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
352 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
353 const u8 *ssid = sm->wpa_auth->conf.ssid;
354 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
355
356
357 if (sm->xxkey_len == 0) {
358 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
359 "derivation");
360 return -1;
361 }
362
363 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
364 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
365 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
366 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
367 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
368 sm->pairwise);
369
370 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
371 pmk_r1, sm->pmk_r1_name);
372 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
373 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
374 WPA_PMK_NAME_LEN);
375 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name,
376 sm->pairwise);
377
378 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
379 sm->wpa_auth->addr, sm->pmk_r1_name,
380 (u8 *) ptk, ptk_len, ptk_name);
381 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
382 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
383
384 return 0;
385 }
386
387
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)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
wpa_ft_gtk_subelem(struct wpa_state_machine * sm,size_t * len)397 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
398 {
399 u8 *subelem;
400 struct wpa_group *gsm = sm->group;
401 size_t subelem_len, pad_len;
402 const u8 *key;
403 size_t key_len;
404 u8 keybuf[32];
405
406 key_len = gsm->GTK_len;
407 if (key_len > sizeof(keybuf))
408 return NULL;
409
410 /*
411 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
412 * than 16 bytes.
413 */
414 pad_len = key_len % 8;
415 if (pad_len)
416 pad_len = 8 - pad_len;
417 if (key_len + pad_len < 16)
418 pad_len += 8;
419 if (pad_len) {
420 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
421 os_memset(keybuf + key_len, 0, pad_len);
422 keybuf[key_len] = 0xdd;
423 key_len += pad_len;
424 key = keybuf;
425 } else
426 key = gsm->GTK[gsm->GN - 1];
427
428 /*
429 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
430 * Key[5..32].
431 */
432 subelem_len = 13 + key_len + 8;
433 subelem = os_zalloc(subelem_len);
434 if (subelem == NULL)
435 return NULL;
436
437 subelem[0] = FTIE_SUBELEM_GTK;
438 subelem[1] = 11 + key_len + 8;
439 /* Key ID in B0-B1 of Key Info */
440 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
441 subelem[4] = gsm->GTK_len;
442 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
443 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) {
444 os_free(subelem);
445 return NULL;
446 }
447
448 *len = subelem_len;
449 return subelem;
450 }
451
452
453 #ifdef CONFIG_IEEE80211W
wpa_ft_igtk_subelem(struct wpa_state_machine * sm,size_t * len)454 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
455 {
456 u8 *subelem, *pos;
457 struct wpa_group *gsm = sm->group;
458 size_t subelem_len;
459
460 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
461 * Key[16+8] */
462 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
463 subelem = os_zalloc(subelem_len);
464 if (subelem == NULL)
465 return NULL;
466
467 pos = subelem;
468 *pos++ = FTIE_SUBELEM_IGTK;
469 *pos++ = subelem_len - 2;
470 WPA_PUT_LE16(pos, gsm->GN_igtk);
471 pos += 2;
472 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
473 pos += 6;
474 *pos++ = WPA_IGTK_LEN;
475 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8,
476 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
477 os_free(subelem);
478 return NULL;
479 }
480
481 *len = subelem_len;
482 return subelem;
483 }
484 #endif /* CONFIG_IEEE80211W */
485
486
wpa_ft_process_rdie(struct wpa_state_machine * sm,u8 * pos,u8 * end,u8 id,u8 descr_count,const u8 * ies,size_t ies_len)487 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
488 u8 *pos, u8 *end, u8 id, u8 descr_count,
489 const u8 *ies, size_t ies_len)
490 {
491 struct ieee802_11_elems parse;
492 struct rsn_rdie *rdie;
493
494 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
495 id, descr_count);
496 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
497 ies, ies_len);
498
499 if (end - pos < (int) sizeof(*rdie)) {
500 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
501 return pos;
502 }
503
504 *pos++ = WLAN_EID_RIC_DATA;
505 *pos++ = sizeof(*rdie);
506 rdie = (struct rsn_rdie *) pos;
507 rdie->id = id;
508 rdie->descr_count = 0;
509 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
510 pos += sizeof(*rdie);
511
512 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
513 ParseFailed) {
514 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
515 rdie->status_code =
516 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
517 return pos;
518 }
519
520 #ifdef NEED_AP_MLME
521 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
522 struct wmm_tspec_element *tspec;
523 int res;
524
525 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
526 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
527 "(%d)", (int) parse.wmm_tspec_len);
528 rdie->status_code =
529 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
530 return pos;
531 }
532 if (end - pos < (int) sizeof(*tspec)) {
533 wpa_printf(MSG_ERROR, "FT: Not enough room for "
534 "response TSPEC");
535 rdie->status_code =
536 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
537 return pos;
538 }
539 tspec = (struct wmm_tspec_element *) pos;
540 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
541 res = wmm_process_tspec(tspec);
542 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
543 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
544 rdie->status_code =
545 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
546 else if (res == WMM_ADDTS_STATUS_REFUSED)
547 rdie->status_code =
548 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
549 else {
550 /* TSPEC accepted; include updated TSPEC in response */
551 rdie->descr_count = 1;
552 pos += sizeof(*tspec);
553 }
554 return pos;
555 }
556 #endif /* NEED_AP_MLME */
557
558 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
559 struct wmm_tspec_element *tspec;
560 int res;
561
562 tspec = (struct wmm_tspec_element *) pos;
563 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
564 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
565 sizeof(*tspec));
566 if (res >= 0) {
567 if (res)
568 rdie->status_code = host_to_le16(res);
569 else {
570 /* TSPEC accepted; include updated TSPEC in
571 * response */
572 rdie->descr_count = 1;
573 pos += sizeof(*tspec);
574 }
575 return pos;
576 }
577 }
578
579 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
580 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
581 return pos;
582 }
583
584
wpa_ft_process_ric(struct wpa_state_machine * sm,u8 * pos,u8 * end,const u8 * ric,size_t ric_len)585 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
586 const u8 *ric, size_t ric_len)
587 {
588 const u8 *rpos, *start;
589 const struct rsn_rdie *rdie;
590
591 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
592
593 rpos = ric;
594 while (rpos + sizeof(*rdie) < ric + ric_len) {
595 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
596 rpos + 2 + rpos[1] > ric + ric_len)
597 break;
598 rdie = (const struct rsn_rdie *) (rpos + 2);
599 rpos += 2 + rpos[1];
600 start = rpos;
601
602 while (rpos + 2 <= ric + ric_len &&
603 rpos + 2 + rpos[1] <= ric + ric_len) {
604 if (rpos[0] == WLAN_EID_RIC_DATA)
605 break;
606 rpos += 2 + rpos[1];
607 }
608 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
609 rdie->descr_count,
610 start, rpos - start);
611 }
612
613 return pos;
614 }
615
616
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)617 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
618 size_t max_len, int auth_alg,
619 const u8 *req_ies, size_t req_ies_len)
620 {
621 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
622 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
623 int res;
624 struct wpa_auth_config *conf;
625 struct rsn_ftie *_ftie;
626 struct wpa_ft_ies parse;
627 u8 *ric_start;
628 u8 *anonce, *snonce;
629
630 if (sm == NULL)
631 return pos;
632
633 conf = &sm->wpa_auth->conf;
634
635 if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
636 sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK)
637 return pos;
638
639 end = pos + max_len;
640
641 if (auth_alg == WLAN_AUTH_FT) {
642 /*
643 * RSN (only present if this is a Reassociation Response and
644 * part of a fast BSS transition)
645 */
646 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
647 if (res < 0)
648 return pos;
649 rsnie = pos;
650 rsnie_len = res;
651 pos += res;
652 }
653
654 /* Mobility Domain Information */
655 res = wpa_write_mdie(conf, pos, end - pos);
656 if (res < 0)
657 return pos;
658 mdie = pos;
659 mdie_len = res;
660 pos += res;
661
662 /* Fast BSS Transition Information */
663 if (auth_alg == WLAN_AUTH_FT) {
664 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
665 r0kh_id = sm->r0kh_id;
666 r0kh_id_len = sm->r0kh_id_len;
667 anonce = sm->ANonce;
668 snonce = sm->SNonce;
669 #ifdef CONFIG_IEEE80211W
670 if (sm->mgmt_frame_prot) {
671 u8 *igtk;
672 size_t igtk_len;
673 u8 *nbuf;
674 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
675 if (igtk == NULL) {
676 os_free(subelem);
677 return pos;
678 }
679 nbuf = os_realloc(subelem, subelem_len + igtk_len);
680 if (nbuf == NULL) {
681 os_free(subelem);
682 os_free(igtk);
683 return pos;
684 }
685 subelem = nbuf;
686 os_memcpy(subelem + subelem_len, igtk, igtk_len);
687 subelem_len += igtk_len;
688 os_free(igtk);
689 }
690 #endif /* CONFIG_IEEE80211W */
691 } else {
692 r0kh_id = conf->r0_key_holder;
693 r0kh_id_len = conf->r0_key_holder_len;
694 anonce = NULL;
695 snonce = NULL;
696 }
697 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
698 end - pos, subelem, subelem_len);
699 os_free(subelem);
700 if (res < 0)
701 return pos;
702 ftie = pos;
703 ftie_len = res;
704 pos += res;
705
706 os_free(sm->assoc_resp_ftie);
707 sm->assoc_resp_ftie = os_malloc(ftie_len);
708 if (sm->assoc_resp_ftie)
709 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
710
711 _ftie = (struct rsn_ftie *) (ftie + 2);
712 if (auth_alg == WLAN_AUTH_FT)
713 _ftie->mic_control[1] = 3; /* Information element count */
714
715 ric_start = pos;
716 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
717 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
718 parse.ric_len);
719 if (auth_alg == WLAN_AUTH_FT)
720 _ftie->mic_control[1] +=
721 ieee802_11_ie_count(ric_start,
722 pos - ric_start);
723 }
724 if (ric_start == pos)
725 ric_start = NULL;
726
727 if (auth_alg == WLAN_AUTH_FT &&
728 wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6,
729 mdie, mdie_len, ftie, ftie_len,
730 rsnie, rsnie_len,
731 ric_start, ric_start ? pos - ric_start : 0,
732 _ftie->mic) < 0)
733 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
734
735 return pos;
736 }
737
738
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)739 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
740 int vlan_id,
741 enum wpa_alg alg, const u8 *addr, int idx,
742 u8 *key, size_t key_len)
743 {
744 if (wpa_auth->cb.set_key == NULL)
745 return -1;
746 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
747 key, key_len);
748 }
749
750
wpa_ft_install_ptk(struct wpa_state_machine * sm)751 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
752 {
753 enum wpa_alg alg;
754 int klen;
755
756 /* MLME-SETKEYS.request(PTK) */
757 alg = wpa_cipher_to_alg(sm->pairwise);
758 klen = wpa_cipher_key_len(sm->pairwise);
759 if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
760 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
761 "PTK configuration", sm->pairwise);
762 return;
763 }
764
765 if (sm->tk_already_set) {
766 /* Must avoid TK reconfiguration to prevent clearing of TX/RX
767 * PN in the driver */
768 wpa_printf(MSG_DEBUG,
769 "FT: Do not re-install same PTK to the driver");
770 return;
771 }
772
773 /* FIX: add STA entry to kernel/driver here? The set_key will fail
774 * most likely without this.. At the moment, STA entry is added only
775 * after association has been completed. This function will be called
776 * again after association to get the PTK configured, but that could be
777 * optimized by adding the STA entry earlier.
778 */
779 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
780 sm->PTK.tk1, klen))
781 return;
782
783 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
784 sm->pairwise_set = TRUE;
785 sm->tk_already_set = TRUE;
786 }
787
788
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)789 static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
790 const u8 *ies, size_t ies_len,
791 u8 **resp_ies, size_t *resp_ies_len)
792 {
793 struct rsn_mdie *mdie;
794 struct rsn_ftie *ftie;
795 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
796 u8 ptk_name[WPA_PMK_NAME_LEN];
797 struct wpa_auth_config *conf;
798 struct wpa_ft_ies parse;
799 size_t buflen, ptk_len;
800 int ret;
801 u8 *pos, *end;
802 int pairwise;
803
804 *resp_ies = NULL;
805 *resp_ies_len = 0;
806
807 sm->pmk_r1_name_valid = 0;
808 conf = &sm->wpa_auth->conf;
809
810 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
811 ies, ies_len);
812
813 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
814 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
815 return WLAN_STATUS_UNSPECIFIED_FAILURE;
816 }
817
818 mdie = (struct rsn_mdie *) parse.mdie;
819 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
820 os_memcmp(mdie->mobility_domain,
821 sm->wpa_auth->conf.mobility_domain,
822 MOBILITY_DOMAIN_ID_LEN) != 0) {
823 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
824 return WLAN_STATUS_INVALID_MDIE;
825 }
826
827 ftie = (struct rsn_ftie *) parse.ftie;
828 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
829 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
830 return WLAN_STATUS_INVALID_FTIE;
831 }
832
833 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
834
835 if (parse.r0kh_id == NULL) {
836 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
837 return WLAN_STATUS_INVALID_FTIE;
838 }
839
840 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
841 parse.r0kh_id, parse.r0kh_id_len);
842 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
843 sm->r0kh_id_len = parse.r0kh_id_len;
844
845 if (parse.rsn_pmkid == NULL) {
846 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
847 return WLAN_STATUS_INVALID_PMKID;
848 }
849
850 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
851 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
852 wpa_derive_pmk_r1_name(parse.rsn_pmkid,
853 sm->wpa_auth->conf.r1_key_holder, sm->addr,
854 pmk_r1_name);
855 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
856 pmk_r1_name, WPA_PMK_NAME_LEN);
857
858 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1,
859 &pairwise) < 0) {
860 if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id,
861 sm->r0kh_id_len, parse.rsn_pmkid) < 0) {
862 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
863 "PMK-R1 and unknown R0KH-ID");
864 return WLAN_STATUS_INVALID_PMKID;
865 }
866
867 /*
868 * TODO: Should return "status pending" (and the caller should
869 * not send out response now). The real response will be sent
870 * once the response from R0KH is received.
871 */
872 return WLAN_STATUS_INVALID_PMKID;
873 }
874
875 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
876 sm->pmk_r1_name_valid = 1;
877 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
878
879 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
880 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
881 "ANonce");
882 return WLAN_STATUS_UNSPECIFIED_FAILURE;
883 }
884
885 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
886 sm->SNonce, WPA_NONCE_LEN);
887 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
888 sm->ANonce, WPA_NONCE_LEN);
889
890 ptk_len = pairwise == WPA_CIPHER_TKIP ? 64 : 48;
891 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
892 sm->wpa_auth->addr, pmk_r1_name,
893 (u8 *) &sm->PTK, ptk_len, ptk_name);
894 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
895 (u8 *) &sm->PTK, ptk_len);
896 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
897
898 sm->pairwise = pairwise;
899 sm->tk_already_set = FALSE;
900 wpa_ft_install_ptk(sm);
901
902 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
903 2 + FT_R1KH_ID_LEN + 200;
904 *resp_ies = os_zalloc(buflen);
905 if (*resp_ies == NULL) {
906 return WLAN_STATUS_UNSPECIFIED_FAILURE;
907 }
908
909 pos = *resp_ies;
910 end = *resp_ies + buflen;
911
912 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
913 if (ret < 0) {
914 os_free(*resp_ies);
915 *resp_ies = NULL;
916 return WLAN_STATUS_UNSPECIFIED_FAILURE;
917 }
918 pos += ret;
919
920 ret = wpa_write_mdie(conf, pos, end - pos);
921 if (ret < 0) {
922 os_free(*resp_ies);
923 *resp_ies = NULL;
924 return WLAN_STATUS_UNSPECIFIED_FAILURE;
925 }
926 pos += ret;
927
928 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
929 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
930 if (ret < 0) {
931 os_free(*resp_ies);
932 *resp_ies = NULL;
933 return WLAN_STATUS_UNSPECIFIED_FAILURE;
934 }
935 pos += ret;
936
937 *resp_ies_len = pos - *resp_ies;
938
939 return WLAN_STATUS_SUCCESS;
940 }
941
942
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)943 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
944 u16 auth_transaction, const u8 *ies, size_t ies_len,
945 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
946 u16 auth_transaction, u16 status,
947 const u8 *ies, size_t ies_len),
948 void *ctx)
949 {
950 u16 status;
951 u8 *resp_ies;
952 size_t resp_ies_len;
953
954 if (sm == NULL) {
955 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
956 "WPA SM not available");
957 return;
958 }
959
960 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
961 " BSSID=" MACSTR " transaction=%d",
962 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
963 status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
964 &resp_ies_len);
965
966 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
967 " auth_transaction=%d status=%d",
968 MAC2STR(sm->addr), auth_transaction + 1, status);
969 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
970 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
971 resp_ies, resp_ies_len);
972 os_free(resp_ies);
973 }
974
975
wpa_ft_validate_reassoc(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)976 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
977 size_t ies_len)
978 {
979 struct wpa_ft_ies parse;
980 struct rsn_mdie *mdie;
981 struct rsn_ftie *ftie;
982 u8 mic[16];
983 unsigned int count;
984
985 if (sm == NULL)
986 return WLAN_STATUS_UNSPECIFIED_FAILURE;
987
988 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
989
990 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
991 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
992 return WLAN_STATUS_UNSPECIFIED_FAILURE;
993 }
994
995 if (parse.rsn == NULL) {
996 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
997 return WLAN_STATUS_UNSPECIFIED_FAILURE;
998 }
999
1000 if (parse.rsn_pmkid == NULL) {
1001 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
1002 return WLAN_STATUS_INVALID_PMKID;
1003 }
1004
1005 if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
1006 {
1007 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
1008 "with the PMKR1Name derived from auth request");
1009 return WLAN_STATUS_INVALID_PMKID;
1010 }
1011
1012 mdie = (struct rsn_mdie *) parse.mdie;
1013 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1014 os_memcmp(mdie->mobility_domain,
1015 sm->wpa_auth->conf.mobility_domain,
1016 MOBILITY_DOMAIN_ID_LEN) != 0) {
1017 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1018 return WLAN_STATUS_INVALID_MDIE;
1019 }
1020
1021 ftie = (struct rsn_ftie *) parse.ftie;
1022 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1023 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1024 return WLAN_STATUS_INVALID_FTIE;
1025 }
1026
1027 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
1028 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1029 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1030 ftie->snonce, WPA_NONCE_LEN);
1031 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1032 sm->SNonce, WPA_NONCE_LEN);
1033 return -1;
1034 }
1035
1036 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
1037 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1038 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1039 ftie->anonce, WPA_NONCE_LEN);
1040 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1041 sm->ANonce, WPA_NONCE_LEN);
1042 return -1;
1043 }
1044
1045
1046 if (parse.r0kh_id == NULL) {
1047 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1048 return -1;
1049 }
1050
1051 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1052 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
1053 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1054 "the current R0KH-ID");
1055 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1056 parse.r0kh_id, parse.r0kh_id_len);
1057 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1058 sm->r0kh_id, sm->r0kh_id_len);
1059 return -1;
1060 }
1061
1062 if (parse.r1kh_id == NULL) {
1063 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1064 return -1;
1065 }
1066
1067 if (os_memcmp(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
1068 FT_R1KH_ID_LEN) != 0) {
1069 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1070 "ReassocReq");
1071 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
1072 parse.r1kh_id, FT_R1KH_ID_LEN);
1073 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
1074 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
1075 return -1;
1076 }
1077
1078 if (parse.rsn_pmkid == NULL ||
1079 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
1080 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1081 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1082 return -1;
1083 }
1084
1085 count = 3;
1086 if (parse.ric)
1087 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1088 if (ftie->mic_control[1] != count) {
1089 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1090 "Control: received %u expected %u",
1091 ftie->mic_control[1], count);
1092 return -1;
1093 }
1094
1095 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5,
1096 parse.mdie - 2, parse.mdie_len + 2,
1097 parse.ftie - 2, parse.ftie_len + 2,
1098 parse.rsn - 2, parse.rsn_len + 2,
1099 parse.ric, parse.ric_len,
1100 mic) < 0) {
1101 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1102 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1103 }
1104
1105 if (os_memcmp(mic, ftie->mic, 16) != 0) {
1106 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1107 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
1108 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
1109 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
1110 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
1111 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
1112 parse.mdie - 2, parse.mdie_len + 2);
1113 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
1114 parse.ftie - 2, parse.ftie_len + 2);
1115 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
1116 parse.rsn - 2, parse.rsn_len + 2);
1117 return WLAN_STATUS_INVALID_FTIE;
1118 }
1119
1120 return WLAN_STATUS_SUCCESS;
1121 }
1122
1123
wpa_ft_action_rx(struct wpa_state_machine * sm,const u8 * data,size_t len)1124 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1125 {
1126 const u8 *sta_addr, *target_ap;
1127 const u8 *ies;
1128 size_t ies_len;
1129 u8 action;
1130 struct ft_rrb_frame *frame;
1131
1132 if (sm == NULL)
1133 return -1;
1134
1135 /*
1136 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1137 * FT Request action frame body[variable]
1138 */
1139
1140 if (len < 14) {
1141 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1142 "(len=%lu)", (unsigned long) len);
1143 return -1;
1144 }
1145
1146 action = data[1];
1147 sta_addr = data + 2;
1148 target_ap = data + 8;
1149 ies = data + 14;
1150 ies_len = len - 14;
1151
1152 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1153 " Target AP=" MACSTR " Action=%d)",
1154 MAC2STR(sta_addr), MAC2STR(target_ap), action);
1155
1156 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1157 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1158 "STA=" MACSTR " STA-Address=" MACSTR,
1159 MAC2STR(sm->addr), MAC2STR(sta_addr));
1160 return -1;
1161 }
1162
1163 /*
1164 * Do some sanity checking on the target AP address (not own and not
1165 * broadcast. This could be extended to filter based on a list of known
1166 * APs in the MD (if such a list were configured).
1167 */
1168 if ((target_ap[0] & 0x01) ||
1169 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1170 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1171 "frame");
1172 return -1;
1173 }
1174
1175 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1176
1177 /* RRB - Forward action frame to the target AP */
1178 frame = os_malloc(sizeof(*frame) + len);
1179 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1180 frame->packet_type = FT_PACKET_REQUEST;
1181 frame->action_length = host_to_le16(len);
1182 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1183 os_memcpy(frame + 1, data, len);
1184
1185 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1186 sizeof(*frame) + len);
1187 os_free(frame);
1188
1189 return 0;
1190 }
1191
1192
wpa_ft_rrb_rx_request(struct wpa_authenticator * wpa_auth,const u8 * current_ap,const u8 * sta_addr,const u8 * body,size_t len)1193 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1194 const u8 *current_ap, const u8 *sta_addr,
1195 const u8 *body, size_t len)
1196 {
1197 struct wpa_state_machine *sm;
1198 u16 status;
1199 u8 *resp_ies, *pos;
1200 size_t resp_ies_len, rlen;
1201 struct ft_rrb_frame *frame;
1202
1203 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1204 if (sm == NULL) {
1205 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1206 "RRB Request");
1207 return -1;
1208 }
1209
1210 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1211
1212 status = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1213 &resp_ies_len);
1214
1215 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1216 " CurrentAP=" MACSTR " status=%d",
1217 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1218 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1219
1220 /* RRB - Forward action frame response to the Current AP */
1221
1222 /*
1223 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1224 * Status_Code[2] FT Request action frame body[variable]
1225 */
1226 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1227
1228 frame = os_malloc(sizeof(*frame) + rlen);
1229 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1230 frame->packet_type = FT_PACKET_RESPONSE;
1231 frame->action_length = host_to_le16(rlen);
1232 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1233 pos = (u8 *) (frame + 1);
1234 *pos++ = WLAN_ACTION_FT;
1235 *pos++ = 2; /* Action: Response */
1236 os_memcpy(pos, sta_addr, ETH_ALEN);
1237 pos += ETH_ALEN;
1238 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1239 pos += ETH_ALEN;
1240 WPA_PUT_LE16(pos, status);
1241 pos += 2;
1242 if (resp_ies) {
1243 os_memcpy(pos, resp_ies, resp_ies_len);
1244 os_free(resp_ies);
1245 }
1246
1247 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1248 sizeof(*frame) + rlen);
1249 os_free(frame);
1250
1251 return 0;
1252 }
1253
1254
wpa_ft_rrb_rx_pull(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1255 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1256 const u8 *src_addr,
1257 const u8 *data, size_t data_len)
1258 {
1259 struct ft_r0kh_r1kh_pull_frame *frame, f;
1260 struct ft_remote_r1kh *r1kh;
1261 struct ft_r0kh_r1kh_resp_frame resp, r;
1262 u8 pmk_r0[PMK_LEN];
1263 int pairwise;
1264
1265 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1266
1267 if (data_len < sizeof(*frame))
1268 return -1;
1269
1270 r1kh = wpa_auth->conf.r1kh_list;
1271 while (r1kh) {
1272 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1273 break;
1274 r1kh = r1kh->next;
1275 }
1276 if (r1kh == NULL) {
1277 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1278 "PMK-R1 pull source address " MACSTR,
1279 MAC2STR(src_addr));
1280 return -1;
1281 }
1282
1283 frame = (struct ft_r0kh_r1kh_pull_frame *) data;
1284 /* aes_unwrap() does not support inplace decryption, so use a temporary
1285 * buffer for the data. */
1286 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1287 frame->nonce, f.nonce) < 0) {
1288 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1289 "request from " MACSTR, MAC2STR(src_addr));
1290 return -1;
1291 }
1292
1293 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1294 f.nonce, sizeof(f.nonce));
1295 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1296 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1297 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1298 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1299
1300 os_memset(&resp, 0, sizeof(resp));
1301 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1302 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1303 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1304 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1305
1306 /* aes_wrap() does not support inplace encryption, so use a temporary
1307 * buffer for the data. */
1308 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1309 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1310 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1311 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1312 &pairwise) < 0) {
1313 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1314 "PMK-R1 pull");
1315 return -1;
1316 }
1317
1318 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1319 r.pmk_r1, r.pmk_r1_name);
1320 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1321 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1322 WPA_PMK_NAME_LEN);
1323 r.pairwise = host_to_le16(pairwise);
1324
1325 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1326 r.nonce, resp.nonce) < 0) {
1327 os_memset(pmk_r0, 0, PMK_LEN);
1328 return -1;
1329 }
1330
1331 os_memset(pmk_r0, 0, PMK_LEN);
1332
1333 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1334
1335 return 0;
1336 }
1337
1338
wpa_ft_rrb_rx_resp(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1339 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1340 const u8 *src_addr,
1341 const u8 *data, size_t data_len)
1342 {
1343 struct ft_r0kh_r1kh_resp_frame *frame, f;
1344 struct ft_remote_r0kh *r0kh;
1345 int pairwise;
1346
1347 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1348
1349 if (data_len < sizeof(*frame))
1350 return -1;
1351
1352 r0kh = wpa_auth->conf.r0kh_list;
1353 while (r0kh) {
1354 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1355 break;
1356 r0kh = r0kh->next;
1357 }
1358 if (r0kh == NULL) {
1359 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1360 "PMK-R0 pull response source address " MACSTR,
1361 MAC2STR(src_addr));
1362 return -1;
1363 }
1364
1365 frame = (struct ft_r0kh_r1kh_resp_frame *) data;
1366 /* aes_unwrap() does not support inplace decryption, so use a temporary
1367 * buffer for the data. */
1368 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1369 frame->nonce, f.nonce) < 0) {
1370 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1371 "response from " MACSTR, MAC2STR(src_addr));
1372 return -1;
1373 }
1374
1375 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1376 != 0) {
1377 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1378 "matching R1KH-ID");
1379 return -1;
1380 }
1381
1382 /* TODO: verify that <nonce,s1kh_id> matches with a pending request
1383 * and call this requests callback function to finish request
1384 * processing */
1385
1386 pairwise = le_to_host16(f.pairwise);
1387 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1388 f.nonce, sizeof(f.nonce));
1389 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1390 MACSTR " pairwise=0x%x",
1391 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1392 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1393 f.pmk_r1, PMK_LEN);
1394 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1395 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1396
1397 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1398 pairwise);
1399 os_memset(f.pmk_r1, 0, PMK_LEN);
1400
1401 return 0;
1402 }
1403
1404
wpa_ft_rrb_rx_push(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1405 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1406 const u8 *src_addr,
1407 const u8 *data, size_t data_len)
1408 {
1409 struct ft_r0kh_r1kh_push_frame *frame, f;
1410 struct ft_remote_r0kh *r0kh;
1411 struct os_time now;
1412 os_time_t tsend;
1413 int pairwise;
1414
1415 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1416
1417 if (data_len < sizeof(*frame))
1418 return -1;
1419
1420 r0kh = wpa_auth->conf.r0kh_list;
1421 while (r0kh) {
1422 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1423 break;
1424 r0kh = r0kh->next;
1425 }
1426 if (r0kh == NULL) {
1427 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1428 "PMK-R0 push source address " MACSTR,
1429 MAC2STR(src_addr));
1430 return -1;
1431 }
1432
1433 frame = (struct ft_r0kh_r1kh_push_frame *) data;
1434 /* aes_unwrap() does not support inplace decryption, so use a temporary
1435 * buffer for the data. */
1436 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1437 frame->timestamp, f.timestamp) < 0) {
1438 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1439 MACSTR, MAC2STR(src_addr));
1440 return -1;
1441 }
1442
1443 os_get_time(&now);
1444 tsend = WPA_GET_LE32(f.timestamp);
1445 if ((now.sec > tsend && now.sec - tsend > 60) ||
1446 (now.sec < tsend && tsend - now.sec > 60)) {
1447 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1448 "timestamp: sender time %d own time %d\n",
1449 (int) tsend, (int) now.sec);
1450 return -1;
1451 }
1452
1453 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1454 != 0) {
1455 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1456 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1457 MAC2STR(f.r1kh_id),
1458 MAC2STR(wpa_auth->conf.r1_key_holder));
1459 return -1;
1460 }
1461
1462 pairwise = le_to_host16(f.pairwise);
1463 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1464 MACSTR " pairwise=0x%x",
1465 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1466 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1467 f.pmk_r1, PMK_LEN);
1468 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1469 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1470
1471 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1472 pairwise);
1473 os_memset(f.pmk_r1, 0, PMK_LEN);
1474
1475 return 0;
1476 }
1477
1478
wpa_ft_rrb_rx(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1479 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1480 const u8 *data, size_t data_len)
1481 {
1482 struct ft_rrb_frame *frame;
1483 u16 alen;
1484 const u8 *pos, *end, *start;
1485 u8 action;
1486 const u8 *sta_addr, *target_ap_addr;
1487
1488 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1489 MAC2STR(src_addr));
1490
1491 if (data_len < sizeof(*frame)) {
1492 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1493 (unsigned long) data_len);
1494 return -1;
1495 }
1496
1497 pos = data;
1498 frame = (struct ft_rrb_frame *) pos;
1499 pos += sizeof(*frame);
1500
1501 alen = le_to_host16(frame->action_length);
1502 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1503 "action_length=%d ap_address=" MACSTR,
1504 frame->frame_type, frame->packet_type, alen,
1505 MAC2STR(frame->ap_address));
1506
1507 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1508 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1509 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1510 "unrecognized type %d", frame->frame_type);
1511 return -1;
1512 }
1513
1514 if (alen > data_len - sizeof(*frame)) {
1515 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1516 "frame");
1517 return -1;
1518 }
1519
1520 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1521 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1522 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1523 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1524 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1525 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1526
1527 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1528
1529 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1530 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1531 "room for Action Frame body); alen=%lu",
1532 (unsigned long) alen);
1533 return -1;
1534 }
1535 start = pos;
1536 end = pos + alen;
1537
1538 if (*pos != WLAN_ACTION_FT) {
1539 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1540 "%d", *pos);
1541 return -1;
1542 }
1543
1544 pos++;
1545 action = *pos++;
1546 sta_addr = pos;
1547 pos += ETH_ALEN;
1548 target_ap_addr = pos;
1549 pos += ETH_ALEN;
1550 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1551 MACSTR " target_ap_addr=" MACSTR,
1552 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1553
1554 if (frame->packet_type == FT_PACKET_REQUEST) {
1555 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1556
1557 if (action != 1) {
1558 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1559 "RRB Request", action);
1560 return -1;
1561 }
1562
1563 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1564 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1565 "RRB Request does not match with own "
1566 "address");
1567 return -1;
1568 }
1569
1570 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1571 sta_addr, pos, end - pos) < 0)
1572 return -1;
1573 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1574 u16 status_code;
1575
1576 if (end - pos < 2) {
1577 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1578 "code in RRB Response");
1579 return -1;
1580 }
1581 status_code = WPA_GET_LE16(pos);
1582 pos += 2;
1583
1584 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1585 "(status_code=%d)", status_code);
1586
1587 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1588 return -1;
1589 } else {
1590 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1591 "packet_type %d", frame->packet_type);
1592 return -1;
1593 }
1594
1595 return 0;
1596 }
1597
1598
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)1599 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1600 struct wpa_ft_pmk_r0_sa *pmk_r0,
1601 struct ft_remote_r1kh *r1kh,
1602 const u8 *s1kh_id, int pairwise)
1603 {
1604 struct ft_r0kh_r1kh_push_frame frame, f;
1605 struct os_time now;
1606
1607 os_memset(&frame, 0, sizeof(frame));
1608 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1609 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1610 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1611 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1612
1613 /* aes_wrap() does not support inplace encryption, so use a temporary
1614 * buffer for the data. */
1615 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1616 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1617 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1618 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1619 s1kh_id, f.pmk_r1, f.pmk_r1_name);
1620 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1621 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1622 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1623 WPA_PMK_NAME_LEN);
1624 os_get_time(&now);
1625 WPA_PUT_LE32(f.timestamp, now.sec);
1626 f.pairwise = host_to_le16(pairwise);
1627 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1628 f.timestamp, frame.timestamp) < 0)
1629 return;
1630
1631 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1632 }
1633
1634
wpa_ft_push_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * addr)1635 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1636 {
1637 struct wpa_ft_pmk_r0_sa *r0;
1638 struct ft_remote_r1kh *r1kh;
1639
1640 if (!wpa_auth->conf.pmk_r1_push)
1641 return;
1642
1643 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1644 while (r0) {
1645 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1646 break;
1647 r0 = r0->next;
1648 }
1649
1650 if (r0 == NULL || r0->pmk_r1_pushed)
1651 return;
1652 r0->pmk_r1_pushed = 1;
1653
1654 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1655 "for STA " MACSTR, MAC2STR(addr));
1656
1657 r1kh = wpa_auth->conf.r1kh_list;
1658 while (r1kh) {
1659 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1660 r1kh = r1kh->next;
1661 }
1662 }
1663
1664 #endif /* CONFIG_IEEE80211R */
1665