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 && key_len < sizeof(keybuf)) {
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 /* FIX: add STA entry to kernel/driver here? The set_key will fail
766 * most likely without this.. At the moment, STA entry is added only
767 * after association has been completed. This function will be called
768 * again after association to get the PTK configured, but that could be
769 * optimized by adding the STA entry earlier.
770 */
771 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
772 sm->PTK.tk1, klen))
773 return;
774
775 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
776 sm->pairwise_set = TRUE;
777 }
778
779
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)780 static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
781 const u8 *ies, size_t ies_len,
782 u8 **resp_ies, size_t *resp_ies_len)
783 {
784 struct rsn_mdie *mdie;
785 struct rsn_ftie *ftie;
786 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
787 u8 ptk_name[WPA_PMK_NAME_LEN];
788 struct wpa_auth_config *conf;
789 struct wpa_ft_ies parse;
790 size_t buflen, ptk_len;
791 int ret;
792 u8 *pos, *end;
793 int pairwise;
794
795 *resp_ies = NULL;
796 *resp_ies_len = 0;
797
798 sm->pmk_r1_name_valid = 0;
799 conf = &sm->wpa_auth->conf;
800
801 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
802 ies, ies_len);
803
804 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
805 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
806 return WLAN_STATUS_UNSPECIFIED_FAILURE;
807 }
808
809 mdie = (struct rsn_mdie *) parse.mdie;
810 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
811 os_memcmp(mdie->mobility_domain,
812 sm->wpa_auth->conf.mobility_domain,
813 MOBILITY_DOMAIN_ID_LEN) != 0) {
814 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
815 return WLAN_STATUS_INVALID_MDIE;
816 }
817
818 ftie = (struct rsn_ftie *) parse.ftie;
819 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
820 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
821 return WLAN_STATUS_INVALID_FTIE;
822 }
823
824 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
825
826 if (parse.r0kh_id == NULL) {
827 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
828 return WLAN_STATUS_INVALID_FTIE;
829 }
830
831 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
832 parse.r0kh_id, parse.r0kh_id_len);
833 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
834 sm->r0kh_id_len = parse.r0kh_id_len;
835
836 if (parse.rsn_pmkid == NULL) {
837 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
838 return WLAN_STATUS_INVALID_PMKID;
839 }
840
841 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
842 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
843 wpa_derive_pmk_r1_name(parse.rsn_pmkid,
844 sm->wpa_auth->conf.r1_key_holder, sm->addr,
845 pmk_r1_name);
846 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
847 pmk_r1_name, WPA_PMK_NAME_LEN);
848
849 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1,
850 &pairwise) < 0) {
851 if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id,
852 sm->r0kh_id_len, parse.rsn_pmkid) < 0) {
853 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
854 "PMK-R1 and unknown R0KH-ID");
855 return WLAN_STATUS_INVALID_PMKID;
856 }
857
858 /*
859 * TODO: Should return "status pending" (and the caller should
860 * not send out response now). The real response will be sent
861 * once the response from R0KH is received.
862 */
863 return WLAN_STATUS_INVALID_PMKID;
864 }
865
866 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
867 sm->pmk_r1_name_valid = 1;
868 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
869
870 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
871 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
872 "ANonce");
873 return WLAN_STATUS_UNSPECIFIED_FAILURE;
874 }
875
876 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
877 sm->SNonce, WPA_NONCE_LEN);
878 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
879 sm->ANonce, WPA_NONCE_LEN);
880
881 ptk_len = pairwise == WPA_CIPHER_TKIP ? 64 : 48;
882 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
883 sm->wpa_auth->addr, pmk_r1_name,
884 (u8 *) &sm->PTK, ptk_len, ptk_name);
885 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
886 (u8 *) &sm->PTK, ptk_len);
887 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
888
889 sm->pairwise = pairwise;
890 wpa_ft_install_ptk(sm);
891
892 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
893 2 + FT_R1KH_ID_LEN + 200;
894 *resp_ies = os_zalloc(buflen);
895 if (*resp_ies == NULL) {
896 return WLAN_STATUS_UNSPECIFIED_FAILURE;
897 }
898
899 pos = *resp_ies;
900 end = *resp_ies + buflen;
901
902 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
903 if (ret < 0) {
904 os_free(*resp_ies);
905 *resp_ies = NULL;
906 return WLAN_STATUS_UNSPECIFIED_FAILURE;
907 }
908 pos += ret;
909
910 ret = wpa_write_mdie(conf, pos, end - pos);
911 if (ret < 0) {
912 os_free(*resp_ies);
913 *resp_ies = NULL;
914 return WLAN_STATUS_UNSPECIFIED_FAILURE;
915 }
916 pos += ret;
917
918 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
919 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
920 if (ret < 0) {
921 os_free(*resp_ies);
922 *resp_ies = NULL;
923 return WLAN_STATUS_UNSPECIFIED_FAILURE;
924 }
925 pos += ret;
926
927 *resp_ies_len = pos - *resp_ies;
928
929 return WLAN_STATUS_SUCCESS;
930 }
931
932
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)933 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
934 u16 auth_transaction, const u8 *ies, size_t ies_len,
935 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
936 u16 auth_transaction, u16 status,
937 const u8 *ies, size_t ies_len),
938 void *ctx)
939 {
940 u16 status;
941 u8 *resp_ies;
942 size_t resp_ies_len;
943
944 if (sm == NULL) {
945 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
946 "WPA SM not available");
947 return;
948 }
949
950 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
951 " BSSID=" MACSTR " transaction=%d",
952 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
953 status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
954 &resp_ies_len);
955
956 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
957 " auth_transaction=%d status=%d",
958 MAC2STR(sm->addr), auth_transaction + 1, status);
959 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
960 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
961 resp_ies, resp_ies_len);
962 os_free(resp_ies);
963 }
964
965
wpa_ft_validate_reassoc(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)966 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
967 size_t ies_len)
968 {
969 struct wpa_ft_ies parse;
970 struct rsn_mdie *mdie;
971 struct rsn_ftie *ftie;
972 u8 mic[16];
973 unsigned int count;
974
975 if (sm == NULL)
976 return WLAN_STATUS_UNSPECIFIED_FAILURE;
977
978 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
979
980 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
981 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
982 return WLAN_STATUS_UNSPECIFIED_FAILURE;
983 }
984
985 if (parse.rsn == NULL) {
986 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
987 return WLAN_STATUS_UNSPECIFIED_FAILURE;
988 }
989
990 if (parse.rsn_pmkid == NULL) {
991 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
992 return WLAN_STATUS_INVALID_PMKID;
993 }
994
995 if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
996 {
997 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
998 "with the PMKR1Name derived from auth request");
999 return WLAN_STATUS_INVALID_PMKID;
1000 }
1001
1002 mdie = (struct rsn_mdie *) parse.mdie;
1003 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1004 os_memcmp(mdie->mobility_domain,
1005 sm->wpa_auth->conf.mobility_domain,
1006 MOBILITY_DOMAIN_ID_LEN) != 0) {
1007 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1008 return WLAN_STATUS_INVALID_MDIE;
1009 }
1010
1011 ftie = (struct rsn_ftie *) parse.ftie;
1012 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1013 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1014 return WLAN_STATUS_INVALID_FTIE;
1015 }
1016
1017 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
1018 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1019 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1020 ftie->snonce, WPA_NONCE_LEN);
1021 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1022 sm->SNonce, WPA_NONCE_LEN);
1023 return -1;
1024 }
1025
1026 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
1027 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1028 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1029 ftie->anonce, WPA_NONCE_LEN);
1030 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1031 sm->ANonce, WPA_NONCE_LEN);
1032 return -1;
1033 }
1034
1035
1036 if (parse.r0kh_id == NULL) {
1037 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1038 return -1;
1039 }
1040
1041 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1042 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
1043 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1044 "the current R0KH-ID");
1045 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1046 parse.r0kh_id, parse.r0kh_id_len);
1047 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1048 sm->r0kh_id, sm->r0kh_id_len);
1049 return -1;
1050 }
1051
1052 if (parse.r1kh_id == NULL) {
1053 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1054 return -1;
1055 }
1056
1057 if (os_memcmp(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
1058 FT_R1KH_ID_LEN) != 0) {
1059 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1060 "ReassocReq");
1061 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
1062 parse.r1kh_id, FT_R1KH_ID_LEN);
1063 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
1064 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
1065 return -1;
1066 }
1067
1068 if (parse.rsn_pmkid == NULL ||
1069 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
1070 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1071 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1072 return -1;
1073 }
1074
1075 count = 3;
1076 if (parse.ric)
1077 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1078 if (ftie->mic_control[1] != count) {
1079 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1080 "Control: received %u expected %u",
1081 ftie->mic_control[1], count);
1082 return -1;
1083 }
1084
1085 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5,
1086 parse.mdie - 2, parse.mdie_len + 2,
1087 parse.ftie - 2, parse.ftie_len + 2,
1088 parse.rsn - 2, parse.rsn_len + 2,
1089 parse.ric, parse.ric_len,
1090 mic) < 0) {
1091 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1092 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1093 }
1094
1095 if (os_memcmp(mic, ftie->mic, 16) != 0) {
1096 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1097 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
1098 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
1099 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
1100 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
1101 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
1102 parse.mdie - 2, parse.mdie_len + 2);
1103 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
1104 parse.ftie - 2, parse.ftie_len + 2);
1105 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
1106 parse.rsn - 2, parse.rsn_len + 2);
1107 return WLAN_STATUS_INVALID_FTIE;
1108 }
1109
1110 return WLAN_STATUS_SUCCESS;
1111 }
1112
1113
wpa_ft_action_rx(struct wpa_state_machine * sm,const u8 * data,size_t len)1114 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1115 {
1116 const u8 *sta_addr, *target_ap;
1117 const u8 *ies;
1118 size_t ies_len;
1119 u8 action;
1120 struct ft_rrb_frame *frame;
1121
1122 if (sm == NULL)
1123 return -1;
1124
1125 /*
1126 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1127 * FT Request action frame body[variable]
1128 */
1129
1130 if (len < 14) {
1131 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1132 "(len=%lu)", (unsigned long) len);
1133 return -1;
1134 }
1135
1136 action = data[1];
1137 sta_addr = data + 2;
1138 target_ap = data + 8;
1139 ies = data + 14;
1140 ies_len = len - 14;
1141
1142 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1143 " Target AP=" MACSTR " Action=%d)",
1144 MAC2STR(sta_addr), MAC2STR(target_ap), action);
1145
1146 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1147 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1148 "STA=" MACSTR " STA-Address=" MACSTR,
1149 MAC2STR(sm->addr), MAC2STR(sta_addr));
1150 return -1;
1151 }
1152
1153 /*
1154 * Do some sanity checking on the target AP address (not own and not
1155 * broadcast. This could be extended to filter based on a list of known
1156 * APs in the MD (if such a list were configured).
1157 */
1158 if ((target_ap[0] & 0x01) ||
1159 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1160 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1161 "frame");
1162 return -1;
1163 }
1164
1165 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1166
1167 /* RRB - Forward action frame to the target AP */
1168 frame = os_malloc(sizeof(*frame) + len);
1169 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1170 frame->packet_type = FT_PACKET_REQUEST;
1171 frame->action_length = host_to_le16(len);
1172 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1173 os_memcpy(frame + 1, data, len);
1174
1175 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1176 sizeof(*frame) + len);
1177 os_free(frame);
1178
1179 return 0;
1180 }
1181
1182
wpa_ft_rrb_rx_request(struct wpa_authenticator * wpa_auth,const u8 * current_ap,const u8 * sta_addr,const u8 * body,size_t len)1183 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1184 const u8 *current_ap, const u8 *sta_addr,
1185 const u8 *body, size_t len)
1186 {
1187 struct wpa_state_machine *sm;
1188 u16 status;
1189 u8 *resp_ies, *pos;
1190 size_t resp_ies_len, rlen;
1191 struct ft_rrb_frame *frame;
1192
1193 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1194 if (sm == NULL) {
1195 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1196 "RRB Request");
1197 return -1;
1198 }
1199
1200 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1201
1202 status = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1203 &resp_ies_len);
1204
1205 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1206 " CurrentAP=" MACSTR " status=%d",
1207 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1208 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1209
1210 /* RRB - Forward action frame response to the Current AP */
1211
1212 /*
1213 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1214 * Status_Code[2] FT Request action frame body[variable]
1215 */
1216 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1217
1218 frame = os_malloc(sizeof(*frame) + rlen);
1219 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1220 frame->packet_type = FT_PACKET_RESPONSE;
1221 frame->action_length = host_to_le16(rlen);
1222 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1223 pos = (u8 *) (frame + 1);
1224 *pos++ = WLAN_ACTION_FT;
1225 *pos++ = 2; /* Action: Response */
1226 os_memcpy(pos, sta_addr, ETH_ALEN);
1227 pos += ETH_ALEN;
1228 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1229 pos += ETH_ALEN;
1230 WPA_PUT_LE16(pos, status);
1231 pos += 2;
1232 if (resp_ies) {
1233 os_memcpy(pos, resp_ies, resp_ies_len);
1234 os_free(resp_ies);
1235 }
1236
1237 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1238 sizeof(*frame) + rlen);
1239 os_free(frame);
1240
1241 return 0;
1242 }
1243
1244
wpa_ft_rrb_rx_pull(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1245 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1246 const u8 *src_addr,
1247 const u8 *data, size_t data_len)
1248 {
1249 struct ft_r0kh_r1kh_pull_frame *frame, f;
1250 struct ft_remote_r1kh *r1kh;
1251 struct ft_r0kh_r1kh_resp_frame resp, r;
1252 u8 pmk_r0[PMK_LEN];
1253 int pairwise;
1254
1255 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1256
1257 if (data_len < sizeof(*frame))
1258 return -1;
1259
1260 r1kh = wpa_auth->conf.r1kh_list;
1261 while (r1kh) {
1262 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1263 break;
1264 r1kh = r1kh->next;
1265 }
1266 if (r1kh == NULL) {
1267 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1268 "PMK-R1 pull source address " MACSTR,
1269 MAC2STR(src_addr));
1270 return -1;
1271 }
1272
1273 frame = (struct ft_r0kh_r1kh_pull_frame *) data;
1274 /* aes_unwrap() does not support inplace decryption, so use a temporary
1275 * buffer for the data. */
1276 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1277 frame->nonce, f.nonce) < 0) {
1278 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1279 "request from " MACSTR, MAC2STR(src_addr));
1280 return -1;
1281 }
1282
1283 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1284 f.nonce, sizeof(f.nonce));
1285 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1286 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1287 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1288 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1289
1290 os_memset(&resp, 0, sizeof(resp));
1291 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1292 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1293 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1294 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1295
1296 /* aes_wrap() does not support inplace encryption, so use a temporary
1297 * buffer for the data. */
1298 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1299 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1300 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1301 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1302 &pairwise) < 0) {
1303 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1304 "PMK-R1 pull");
1305 return -1;
1306 }
1307
1308 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1309 r.pmk_r1, r.pmk_r1_name);
1310 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1311 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1312 WPA_PMK_NAME_LEN);
1313 r.pairwise = host_to_le16(pairwise);
1314
1315 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1316 r.nonce, resp.nonce) < 0) {
1317 os_memset(pmk_r0, 0, PMK_LEN);
1318 return -1;
1319 }
1320
1321 os_memset(pmk_r0, 0, PMK_LEN);
1322
1323 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1324
1325 return 0;
1326 }
1327
1328
wpa_ft_rrb_rx_resp(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1329 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1330 const u8 *src_addr,
1331 const u8 *data, size_t data_len)
1332 {
1333 struct ft_r0kh_r1kh_resp_frame *frame, f;
1334 struct ft_remote_r0kh *r0kh;
1335 int pairwise;
1336
1337 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1338
1339 if (data_len < sizeof(*frame))
1340 return -1;
1341
1342 r0kh = wpa_auth->conf.r0kh_list;
1343 while (r0kh) {
1344 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1345 break;
1346 r0kh = r0kh->next;
1347 }
1348 if (r0kh == NULL) {
1349 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1350 "PMK-R0 pull response source address " MACSTR,
1351 MAC2STR(src_addr));
1352 return -1;
1353 }
1354
1355 frame = (struct ft_r0kh_r1kh_resp_frame *) data;
1356 /* aes_unwrap() does not support inplace decryption, so use a temporary
1357 * buffer for the data. */
1358 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1359 frame->nonce, f.nonce) < 0) {
1360 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1361 "response from " MACSTR, MAC2STR(src_addr));
1362 return -1;
1363 }
1364
1365 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1366 != 0) {
1367 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1368 "matching R1KH-ID");
1369 return -1;
1370 }
1371
1372 /* TODO: verify that <nonce,s1kh_id> matches with a pending request
1373 * and call this requests callback function to finish request
1374 * processing */
1375
1376 pairwise = le_to_host16(f.pairwise);
1377 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1378 f.nonce, sizeof(f.nonce));
1379 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1380 MACSTR " pairwise=0x%x",
1381 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1382 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1383 f.pmk_r1, PMK_LEN);
1384 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1385 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1386
1387 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1388 pairwise);
1389 os_memset(f.pmk_r1, 0, PMK_LEN);
1390
1391 return 0;
1392 }
1393
1394
wpa_ft_rrb_rx_push(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1395 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1396 const u8 *src_addr,
1397 const u8 *data, size_t data_len)
1398 {
1399 struct ft_r0kh_r1kh_push_frame *frame, f;
1400 struct ft_remote_r0kh *r0kh;
1401 struct os_time now;
1402 os_time_t tsend;
1403 int pairwise;
1404
1405 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1406
1407 if (data_len < sizeof(*frame))
1408 return -1;
1409
1410 r0kh = wpa_auth->conf.r0kh_list;
1411 while (r0kh) {
1412 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1413 break;
1414 r0kh = r0kh->next;
1415 }
1416 if (r0kh == NULL) {
1417 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1418 "PMK-R0 push source address " MACSTR,
1419 MAC2STR(src_addr));
1420 return -1;
1421 }
1422
1423 frame = (struct ft_r0kh_r1kh_push_frame *) data;
1424 /* aes_unwrap() does not support inplace decryption, so use a temporary
1425 * buffer for the data. */
1426 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1427 frame->timestamp, f.timestamp) < 0) {
1428 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1429 MACSTR, MAC2STR(src_addr));
1430 return -1;
1431 }
1432
1433 os_get_time(&now);
1434 tsend = WPA_GET_LE32(f.timestamp);
1435 if ((now.sec > tsend && now.sec - tsend > 60) ||
1436 (now.sec < tsend && tsend - now.sec > 60)) {
1437 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1438 "timestamp: sender time %d own time %d\n",
1439 (int) tsend, (int) now.sec);
1440 return -1;
1441 }
1442
1443 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1444 != 0) {
1445 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1446 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1447 MAC2STR(f.r1kh_id),
1448 MAC2STR(wpa_auth->conf.r1_key_holder));
1449 return -1;
1450 }
1451
1452 pairwise = le_to_host16(f.pairwise);
1453 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1454 MACSTR " pairwise=0x%x",
1455 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1456 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1457 f.pmk_r1, PMK_LEN);
1458 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1459 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1460
1461 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1462 pairwise);
1463 os_memset(f.pmk_r1, 0, PMK_LEN);
1464
1465 return 0;
1466 }
1467
1468
wpa_ft_rrb_rx(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1469 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1470 const u8 *data, size_t data_len)
1471 {
1472 struct ft_rrb_frame *frame;
1473 u16 alen;
1474 const u8 *pos, *end, *start;
1475 u8 action;
1476 const u8 *sta_addr, *target_ap_addr;
1477
1478 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1479 MAC2STR(src_addr));
1480
1481 if (data_len < sizeof(*frame)) {
1482 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1483 (unsigned long) data_len);
1484 return -1;
1485 }
1486
1487 pos = data;
1488 frame = (struct ft_rrb_frame *) pos;
1489 pos += sizeof(*frame);
1490
1491 alen = le_to_host16(frame->action_length);
1492 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1493 "action_length=%d ap_address=" MACSTR,
1494 frame->frame_type, frame->packet_type, alen,
1495 MAC2STR(frame->ap_address));
1496
1497 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1498 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1499 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1500 "unrecognized type %d", frame->frame_type);
1501 return -1;
1502 }
1503
1504 if (alen > data_len - sizeof(*frame)) {
1505 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1506 "frame");
1507 return -1;
1508 }
1509
1510 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1511 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1512 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1513 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1514 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1515 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1516
1517 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1518
1519 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1520 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1521 "room for Action Frame body); alen=%lu",
1522 (unsigned long) alen);
1523 return -1;
1524 }
1525 start = pos;
1526 end = pos + alen;
1527
1528 if (*pos != WLAN_ACTION_FT) {
1529 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1530 "%d", *pos);
1531 return -1;
1532 }
1533
1534 pos++;
1535 action = *pos++;
1536 sta_addr = pos;
1537 pos += ETH_ALEN;
1538 target_ap_addr = pos;
1539 pos += ETH_ALEN;
1540 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1541 MACSTR " target_ap_addr=" MACSTR,
1542 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1543
1544 if (frame->packet_type == FT_PACKET_REQUEST) {
1545 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1546
1547 if (action != 1) {
1548 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1549 "RRB Request", action);
1550 return -1;
1551 }
1552
1553 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1554 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1555 "RRB Request does not match with own "
1556 "address");
1557 return -1;
1558 }
1559
1560 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1561 sta_addr, pos, end - pos) < 0)
1562 return -1;
1563 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1564 u16 status_code;
1565
1566 if (end - pos < 2) {
1567 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1568 "code in RRB Response");
1569 return -1;
1570 }
1571 status_code = WPA_GET_LE16(pos);
1572 pos += 2;
1573
1574 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1575 "(status_code=%d)", status_code);
1576
1577 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1578 return -1;
1579 } else {
1580 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1581 "packet_type %d", frame->packet_type);
1582 return -1;
1583 }
1584
1585 return 0;
1586 }
1587
1588
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)1589 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1590 struct wpa_ft_pmk_r0_sa *pmk_r0,
1591 struct ft_remote_r1kh *r1kh,
1592 const u8 *s1kh_id, int pairwise)
1593 {
1594 struct ft_r0kh_r1kh_push_frame frame, f;
1595 struct os_time now;
1596
1597 os_memset(&frame, 0, sizeof(frame));
1598 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1599 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1600 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1601 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1602
1603 /* aes_wrap() does not support inplace encryption, so use a temporary
1604 * buffer for the data. */
1605 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1606 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1607 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1608 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1609 s1kh_id, f.pmk_r1, f.pmk_r1_name);
1610 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1611 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1612 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1613 WPA_PMK_NAME_LEN);
1614 os_get_time(&now);
1615 WPA_PUT_LE32(f.timestamp, now.sec);
1616 f.pairwise = host_to_le16(pairwise);
1617 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1618 f.timestamp, frame.timestamp) < 0)
1619 return;
1620
1621 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1622 }
1623
1624
wpa_ft_push_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * addr)1625 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1626 {
1627 struct wpa_ft_pmk_r0_sa *r0;
1628 struct ft_remote_r1kh *r1kh;
1629
1630 if (!wpa_auth->conf.pmk_r1_push)
1631 return;
1632
1633 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1634 while (r0) {
1635 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1636 break;
1637 r0 = r0->next;
1638 }
1639
1640 if (r0 == NULL || r0->pmk_r1_pushed)
1641 return;
1642 r0->pmk_r1_pushed = 1;
1643
1644 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1645 "for STA " MACSTR, MAC2STR(addr));
1646
1647 r1kh = wpa_auth->conf.r1kh_list;
1648 while (r1kh) {
1649 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1650 r1kh = r1kh->next;
1651 }
1652 }
1653
1654 #endif /* CONFIG_IEEE80211R */
1655