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FT: Fix WMM TSPEC validation in driver-based AP MLME case
[thirdparty/hostap.git] / src / ap / wpa_auth_ft.c
1 /*
2 * hostapd - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2004-2015, 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 "utils/eloop.h"
13 #include "utils/list.h"
14 #include "common/ieee802_11_defs.h"
15 #include "common/ieee802_11_common.h"
16 #include "crypto/aes_wrap.h"
17 #include "crypto/random.h"
18 #include "ap_config.h"
19 #include "ieee802_11.h"
20 #include "wmm.h"
21 #include "wpa_auth.h"
22 #include "wpa_auth_i.h"
23
24
25 #ifdef CONFIG_IEEE80211R
26
27 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
28 const u8 *current_ap, const u8 *sta_addr,
29 u16 status, const u8 *resp_ies,
30 size_t resp_ies_len);
31
32
33 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
34 const u8 *data, size_t data_len)
35 {
36 if (wpa_auth->cb.send_ether == NULL)
37 return -1;
38 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
39 return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
40 data, data_len);
41 }
42
43
44 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
45 const u8 *dst, const u8 *data, size_t data_len)
46 {
47 if (wpa_auth->cb.send_ft_action == NULL)
48 return -1;
49 return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
50 data, data_len);
51 }
52
53
54 static struct wpa_state_machine *
55 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
56 {
57 if (wpa_auth->cb.add_sta == NULL)
58 return NULL;
59 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
60 }
61
62
63 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
64 const u8 *sta_addr,
65 u8 *tspec_ie, size_t tspec_ielen)
66 {
67 if (wpa_auth->cb.add_tspec == NULL) {
68 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
69 return -1;
70 }
71 return wpa_auth->cb.add_tspec(wpa_auth->cb.ctx, sta_addr, tspec_ie,
72 tspec_ielen);
73 }
74
75
76 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
77 {
78 u8 *pos = buf;
79 u8 capab;
80 if (len < 2 + sizeof(struct rsn_mdie))
81 return -1;
82
83 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
84 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
85 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
86 pos += MOBILITY_DOMAIN_ID_LEN;
87 capab = 0;
88 if (conf->ft_over_ds)
89 capab |= RSN_FT_CAPAB_FT_OVER_DS;
90 *pos++ = capab;
91
92 return pos - buf;
93 }
94
95
96 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
97 size_t r0kh_id_len,
98 const u8 *anonce, const u8 *snonce,
99 u8 *buf, size_t len, const u8 *subelem,
100 size_t subelem_len)
101 {
102 u8 *pos = buf, *ielen;
103 struct rsn_ftie *hdr;
104
105 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
106 subelem_len)
107 return -1;
108
109 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
110 ielen = pos++;
111
112 hdr = (struct rsn_ftie *) pos;
113 os_memset(hdr, 0, sizeof(*hdr));
114 pos += sizeof(*hdr);
115 WPA_PUT_LE16(hdr->mic_control, 0);
116 if (anonce)
117 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
118 if (snonce)
119 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
120
121 /* Optional Parameters */
122 *pos++ = FTIE_SUBELEM_R1KH_ID;
123 *pos++ = FT_R1KH_ID_LEN;
124 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
125 pos += FT_R1KH_ID_LEN;
126
127 if (r0kh_id) {
128 *pos++ = FTIE_SUBELEM_R0KH_ID;
129 *pos++ = r0kh_id_len;
130 os_memcpy(pos, r0kh_id, r0kh_id_len);
131 pos += r0kh_id_len;
132 }
133
134 if (subelem) {
135 os_memcpy(pos, subelem, subelem_len);
136 pos += subelem_len;
137 }
138
139 *ielen = pos - buf - 2;
140
141 return pos - buf;
142 }
143
144
145 struct wpa_ft_pmk_r0_sa {
146 struct wpa_ft_pmk_r0_sa *next;
147 u8 pmk_r0[PMK_LEN];
148 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
149 u8 spa[ETH_ALEN];
150 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
151 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
152 int pmk_r1_pushed;
153 };
154
155 struct wpa_ft_pmk_r1_sa {
156 struct wpa_ft_pmk_r1_sa *next;
157 u8 pmk_r1[PMK_LEN];
158 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
159 u8 spa[ETH_ALEN];
160 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
161 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
162 };
163
164 struct wpa_ft_pmk_cache {
165 struct wpa_ft_pmk_r0_sa *pmk_r0;
166 struct wpa_ft_pmk_r1_sa *pmk_r1;
167 };
168
169 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
170 {
171 struct wpa_ft_pmk_cache *cache;
172
173 cache = os_zalloc(sizeof(*cache));
174
175 return cache;
176 }
177
178
179 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
180 {
181 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
182 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
183
184 r0 = cache->pmk_r0;
185 while (r0) {
186 r0prev = r0;
187 r0 = r0->next;
188 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
189 os_free(r0prev);
190 }
191
192 r1 = cache->pmk_r1;
193 while (r1) {
194 r1prev = r1;
195 r1 = r1->next;
196 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
197 os_free(r1prev);
198 }
199
200 os_free(cache);
201 }
202
203
204 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
205 const u8 *spa, const u8 *pmk_r0,
206 const u8 *pmk_r0_name, int pairwise)
207 {
208 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
209 struct wpa_ft_pmk_r0_sa *r0;
210
211 /* TODO: add expiration and limit on number of entries in cache */
212
213 r0 = os_zalloc(sizeof(*r0));
214 if (r0 == NULL)
215 return -1;
216
217 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
218 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
219 os_memcpy(r0->spa, spa, ETH_ALEN);
220 r0->pairwise = pairwise;
221
222 r0->next = cache->pmk_r0;
223 cache->pmk_r0 = r0;
224
225 return 0;
226 }
227
228
229 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
230 const u8 *spa, const u8 *pmk_r0_name,
231 u8 *pmk_r0, int *pairwise)
232 {
233 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
234 struct wpa_ft_pmk_r0_sa *r0;
235
236 r0 = cache->pmk_r0;
237 while (r0) {
238 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
239 os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
240 WPA_PMK_NAME_LEN) == 0) {
241 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
242 if (pairwise)
243 *pairwise = r0->pairwise;
244 return 0;
245 }
246
247 r0 = r0->next;
248 }
249
250 return -1;
251 }
252
253
254 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
255 const u8 *spa, const u8 *pmk_r1,
256 const u8 *pmk_r1_name, int pairwise)
257 {
258 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
259 struct wpa_ft_pmk_r1_sa *r1;
260
261 /* TODO: add expiration and limit on number of entries in cache */
262
263 r1 = os_zalloc(sizeof(*r1));
264 if (r1 == NULL)
265 return -1;
266
267 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
268 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
269 os_memcpy(r1->spa, spa, ETH_ALEN);
270 r1->pairwise = pairwise;
271
272 r1->next = cache->pmk_r1;
273 cache->pmk_r1 = r1;
274
275 return 0;
276 }
277
278
279 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
280 const u8 *spa, const u8 *pmk_r1_name,
281 u8 *pmk_r1, int *pairwise)
282 {
283 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
284 struct wpa_ft_pmk_r1_sa *r1;
285
286 r1 = cache->pmk_r1;
287 while (r1) {
288 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
289 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
290 WPA_PMK_NAME_LEN) == 0) {
291 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
292 if (pairwise)
293 *pairwise = r1->pairwise;
294 return 0;
295 }
296
297 r1 = r1->next;
298 }
299
300 return -1;
301 }
302
303
304 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
305 const u8 *ies, size_t ies_len,
306 const u8 *pmk_r0_name)
307 {
308 struct ft_remote_r0kh *r0kh;
309 struct ft_r0kh_r1kh_pull_frame frame, f;
310
311 r0kh = sm->wpa_auth->conf.r0kh_list;
312 while (r0kh) {
313 if (r0kh->id_len == sm->r0kh_id_len &&
314 os_memcmp_const(r0kh->id, sm->r0kh_id, sm->r0kh_id_len) ==
315 0)
316 break;
317 r0kh = r0kh->next;
318 }
319 if (r0kh == NULL) {
320 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
321 sm->r0kh_id, sm->r0kh_id_len);
322 return -1;
323 }
324
325 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
326 "address " MACSTR, MAC2STR(r0kh->addr));
327
328 os_memset(&frame, 0, sizeof(frame));
329 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
330 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
331 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
332 os_memcpy(frame.ap_address, sm->wpa_auth->addr, ETH_ALEN);
333
334 /* aes_wrap() does not support inplace encryption, so use a temporary
335 * buffer for the data. */
336 if (random_get_bytes(f.nonce, FT_R0KH_R1KH_PULL_NONCE_LEN)) {
337 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
338 "nonce");
339 return -1;
340 }
341 os_memcpy(sm->ft_pending_pull_nonce, f.nonce,
342 FT_R0KH_R1KH_PULL_NONCE_LEN);
343 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
344 os_memcpy(f.r1kh_id, sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
345 os_memcpy(f.s1kh_id, sm->addr, ETH_ALEN);
346 os_memset(f.pad, 0, sizeof(f.pad));
347
348 if (aes_wrap(r0kh->key, sizeof(r0kh->key),
349 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
350 f.nonce, frame.nonce) < 0)
351 return -1;
352
353 wpabuf_free(sm->ft_pending_req_ies);
354 sm->ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
355 if (sm->ft_pending_req_ies == NULL)
356 return -1;
357
358 wpa_ft_rrb_send(sm->wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
359
360 return 0;
361 }
362
363
364 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
365 struct wpa_ptk *ptk)
366 {
367 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
368 u8 pmk_r1[PMK_LEN];
369 u8 ptk_name[WPA_PMK_NAME_LEN];
370 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
371 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
372 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
373 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
374 const u8 *ssid = sm->wpa_auth->conf.ssid;
375 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
376
377 if (sm->xxkey_len == 0) {
378 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
379 "derivation");
380 return -1;
381 }
382
383 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
384 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
385 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
386 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
387 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
388 sm->pairwise);
389
390 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
391 pmk_r1, sm->pmk_r1_name);
392 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
393 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
394 WPA_PMK_NAME_LEN);
395 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name,
396 sm->pairwise);
397
398 return wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
399 sm->wpa_auth->addr, sm->pmk_r1_name,
400 ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise);
401 }
402
403
404 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
405 const u8 *addr, int idx, u8 *seq)
406 {
407 if (wpa_auth->cb.get_seqnum == NULL)
408 return -1;
409 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
410 }
411
412
413 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
414 {
415 u8 *subelem;
416 struct wpa_group *gsm = sm->group;
417 size_t subelem_len, pad_len;
418 const u8 *key;
419 size_t key_len;
420 u8 keybuf[32];
421
422 key_len = gsm->GTK_len;
423 if (key_len > sizeof(keybuf))
424 return NULL;
425
426 /*
427 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
428 * than 16 bytes.
429 */
430 pad_len = key_len % 8;
431 if (pad_len)
432 pad_len = 8 - pad_len;
433 if (key_len + pad_len < 16)
434 pad_len += 8;
435 if (pad_len && key_len < sizeof(keybuf)) {
436 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
437 os_memset(keybuf + key_len, 0, pad_len);
438 keybuf[key_len] = 0xdd;
439 key_len += pad_len;
440 key = keybuf;
441 } else
442 key = gsm->GTK[gsm->GN - 1];
443
444 /*
445 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
446 * Key[5..32].
447 */
448 subelem_len = 13 + key_len + 8;
449 subelem = os_zalloc(subelem_len);
450 if (subelem == NULL)
451 return NULL;
452
453 subelem[0] = FTIE_SUBELEM_GTK;
454 subelem[1] = 11 + key_len + 8;
455 /* Key ID in B0-B1 of Key Info */
456 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
457 subelem[4] = gsm->GTK_len;
458 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
459 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, key_len / 8, key,
460 subelem + 13)) {
461 os_free(subelem);
462 return NULL;
463 }
464
465 *len = subelem_len;
466 return subelem;
467 }
468
469
470 #ifdef CONFIG_IEEE80211W
471 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
472 {
473 u8 *subelem, *pos;
474 struct wpa_group *gsm = sm->group;
475 size_t subelem_len;
476
477 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
478 * Key[16+8] */
479 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
480 subelem = os_zalloc(subelem_len);
481 if (subelem == NULL)
482 return NULL;
483
484 pos = subelem;
485 *pos++ = FTIE_SUBELEM_IGTK;
486 *pos++ = subelem_len - 2;
487 WPA_PUT_LE16(pos, gsm->GN_igtk);
488 pos += 2;
489 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
490 pos += 6;
491 *pos++ = WPA_IGTK_LEN;
492 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, WPA_IGTK_LEN / 8,
493 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
494 os_free(subelem);
495 return NULL;
496 }
497
498 *len = subelem_len;
499 return subelem;
500 }
501 #endif /* CONFIG_IEEE80211W */
502
503
504 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
505 u8 *pos, u8 *end, u8 id, u8 descr_count,
506 const u8 *ies, size_t ies_len)
507 {
508 struct ieee802_11_elems parse;
509 struct rsn_rdie *rdie;
510
511 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
512 id, descr_count);
513 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
514 ies, ies_len);
515
516 if (end - pos < (int) sizeof(*rdie)) {
517 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
518 return pos;
519 }
520
521 *pos++ = WLAN_EID_RIC_DATA;
522 *pos++ = sizeof(*rdie);
523 rdie = (struct rsn_rdie *) pos;
524 rdie->id = id;
525 rdie->descr_count = 0;
526 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
527 pos += sizeof(*rdie);
528
529 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
530 ParseFailed) {
531 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
532 rdie->status_code =
533 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
534 return pos;
535 }
536
537 if (parse.wmm_tspec) {
538 struct wmm_tspec_element *tspec;
539
540 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
541 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
542 "(%d)", (int) parse.wmm_tspec_len);
543 rdie->status_code =
544 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
545 return pos;
546 }
547 if (end - pos < (int) sizeof(*tspec)) {
548 wpa_printf(MSG_ERROR, "FT: Not enough room for "
549 "response TSPEC");
550 rdie->status_code =
551 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
552 return pos;
553 }
554 tspec = (struct wmm_tspec_element *) pos;
555 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
556 }
557
558 #ifdef NEED_AP_MLME
559 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
560 int res;
561
562 res = wmm_process_tspec((struct wmm_tspec_element *) pos);
563 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
564 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
565 rdie->status_code =
566 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
567 else if (res == WMM_ADDTS_STATUS_REFUSED)
568 rdie->status_code =
569 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
570 else {
571 /* TSPEC accepted; include updated TSPEC in response */
572 rdie->descr_count = 1;
573 pos += sizeof(struct wmm_tspec_element);
574 }
575 return pos;
576 }
577 #endif /* NEED_AP_MLME */
578
579 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
580 int res;
581
582 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
583 sizeof(struct wmm_tspec_element));
584 if (res >= 0) {
585 if (res)
586 rdie->status_code = host_to_le16(res);
587 else {
588 /* TSPEC accepted; include updated TSPEC in
589 * response */
590 rdie->descr_count = 1;
591 pos += sizeof(struct wmm_tspec_element);
592 }
593 return pos;
594 }
595 }
596
597 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
598 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
599 return pos;
600 }
601
602
603 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
604 const u8 *ric, size_t ric_len)
605 {
606 const u8 *rpos, *start;
607 const struct rsn_rdie *rdie;
608
609 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
610
611 rpos = ric;
612 while (rpos + sizeof(*rdie) < ric + ric_len) {
613 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
614 rpos + 2 + rpos[1] > ric + ric_len)
615 break;
616 rdie = (const struct rsn_rdie *) (rpos + 2);
617 rpos += 2 + rpos[1];
618 start = rpos;
619
620 while (rpos + 2 <= ric + ric_len &&
621 rpos + 2 + rpos[1] <= ric + ric_len) {
622 if (rpos[0] == WLAN_EID_RIC_DATA)
623 break;
624 rpos += 2 + rpos[1];
625 }
626 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
627 rdie->descr_count,
628 start, rpos - start);
629 }
630
631 return pos;
632 }
633
634
635 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
636 size_t max_len, int auth_alg,
637 const u8 *req_ies, size_t req_ies_len)
638 {
639 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
640 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
641 int res;
642 struct wpa_auth_config *conf;
643 struct rsn_ftie *_ftie;
644 struct wpa_ft_ies parse;
645 u8 *ric_start;
646 u8 *anonce, *snonce;
647
648 if (sm == NULL)
649 return pos;
650
651 conf = &sm->wpa_auth->conf;
652
653 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
654 return pos;
655
656 end = pos + max_len;
657
658 if (auth_alg == WLAN_AUTH_FT) {
659 /*
660 * RSN (only present if this is a Reassociation Response and
661 * part of a fast BSS transition)
662 */
663 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
664 if (res < 0)
665 return pos;
666 rsnie = pos;
667 rsnie_len = res;
668 pos += res;
669 }
670
671 /* Mobility Domain Information */
672 res = wpa_write_mdie(conf, pos, end - pos);
673 if (res < 0)
674 return pos;
675 mdie = pos;
676 mdie_len = res;
677 pos += res;
678
679 /* Fast BSS Transition Information */
680 if (auth_alg == WLAN_AUTH_FT) {
681 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
682 r0kh_id = sm->r0kh_id;
683 r0kh_id_len = sm->r0kh_id_len;
684 anonce = sm->ANonce;
685 snonce = sm->SNonce;
686 #ifdef CONFIG_IEEE80211W
687 if (sm->mgmt_frame_prot) {
688 u8 *igtk;
689 size_t igtk_len;
690 u8 *nbuf;
691 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
692 if (igtk == NULL) {
693 os_free(subelem);
694 return pos;
695 }
696 nbuf = os_realloc(subelem, subelem_len + igtk_len);
697 if (nbuf == NULL) {
698 os_free(subelem);
699 os_free(igtk);
700 return pos;
701 }
702 subelem = nbuf;
703 os_memcpy(subelem + subelem_len, igtk, igtk_len);
704 subelem_len += igtk_len;
705 os_free(igtk);
706 }
707 #endif /* CONFIG_IEEE80211W */
708 } else {
709 r0kh_id = conf->r0_key_holder;
710 r0kh_id_len = conf->r0_key_holder_len;
711 anonce = NULL;
712 snonce = NULL;
713 }
714 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
715 end - pos, subelem, subelem_len);
716 os_free(subelem);
717 if (res < 0)
718 return pos;
719 ftie = pos;
720 ftie_len = res;
721 pos += res;
722
723 os_free(sm->assoc_resp_ftie);
724 sm->assoc_resp_ftie = os_malloc(ftie_len);
725 if (sm->assoc_resp_ftie)
726 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
727
728 _ftie = (struct rsn_ftie *) (ftie + 2);
729 if (auth_alg == WLAN_AUTH_FT)
730 _ftie->mic_control[1] = 3; /* Information element count */
731
732 ric_start = pos;
733 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
734 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
735 parse.ric_len);
736 if (auth_alg == WLAN_AUTH_FT)
737 _ftie->mic_control[1] +=
738 ieee802_11_ie_count(ric_start,
739 pos - ric_start);
740 }
741 if (ric_start == pos)
742 ric_start = NULL;
743
744 if (auth_alg == WLAN_AUTH_FT &&
745 wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
746 sm->wpa_auth->addr, 6,
747 mdie, mdie_len, ftie, ftie_len,
748 rsnie, rsnie_len,
749 ric_start, ric_start ? pos - ric_start : 0,
750 _ftie->mic) < 0)
751 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
752
753 return pos;
754 }
755
756
757 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
758 int vlan_id,
759 enum wpa_alg alg, const u8 *addr, int idx,
760 u8 *key, size_t key_len)
761 {
762 if (wpa_auth->cb.set_key == NULL)
763 return -1;
764 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
765 key, key_len);
766 }
767
768
769 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
770 {
771 enum wpa_alg alg;
772 int klen;
773
774 /* MLME-SETKEYS.request(PTK) */
775 alg = wpa_cipher_to_alg(sm->pairwise);
776 klen = wpa_cipher_key_len(sm->pairwise);
777 if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
778 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
779 "PTK configuration", sm->pairwise);
780 return;
781 }
782
783 /* FIX: add STA entry to kernel/driver here? The set_key will fail
784 * most likely without this.. At the moment, STA entry is added only
785 * after association has been completed. This function will be called
786 * again after association to get the PTK configured, but that could be
787 * optimized by adding the STA entry earlier.
788 */
789 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
790 sm->PTK.tk, klen))
791 return;
792
793 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
794 sm->pairwise_set = TRUE;
795 }
796
797
798 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
799 const u8 *ies, size_t ies_len,
800 u8 **resp_ies, size_t *resp_ies_len)
801 {
802 struct rsn_mdie *mdie;
803 struct rsn_ftie *ftie;
804 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
805 u8 ptk_name[WPA_PMK_NAME_LEN];
806 struct wpa_auth_config *conf;
807 struct wpa_ft_ies parse;
808 size_t buflen;
809 int ret;
810 u8 *pos, *end;
811 int pairwise;
812
813 *resp_ies = NULL;
814 *resp_ies_len = 0;
815
816 sm->pmk_r1_name_valid = 0;
817 conf = &sm->wpa_auth->conf;
818
819 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
820 ies, ies_len);
821
822 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
823 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
824 return WLAN_STATUS_UNSPECIFIED_FAILURE;
825 }
826
827 mdie = (struct rsn_mdie *) parse.mdie;
828 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
829 os_memcmp(mdie->mobility_domain,
830 sm->wpa_auth->conf.mobility_domain,
831 MOBILITY_DOMAIN_ID_LEN) != 0) {
832 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
833 return WLAN_STATUS_INVALID_MDIE;
834 }
835
836 ftie = (struct rsn_ftie *) parse.ftie;
837 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
838 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
839 return WLAN_STATUS_INVALID_FTIE;
840 }
841
842 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
843
844 if (parse.r0kh_id == NULL) {
845 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
846 return WLAN_STATUS_INVALID_FTIE;
847 }
848
849 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
850 parse.r0kh_id, parse.r0kh_id_len);
851 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
852 sm->r0kh_id_len = parse.r0kh_id_len;
853
854 if (parse.rsn_pmkid == NULL) {
855 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
856 return WLAN_STATUS_INVALID_PMKID;
857 }
858
859 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
860 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
861 wpa_derive_pmk_r1_name(parse.rsn_pmkid,
862 sm->wpa_auth->conf.r1_key_holder, sm->addr,
863 pmk_r1_name);
864 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
865 pmk_r1_name, WPA_PMK_NAME_LEN);
866
867 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1,
868 &pairwise) < 0) {
869 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
870 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
871 "PMK-R1 and unknown R0KH-ID");
872 return WLAN_STATUS_INVALID_PMKID;
873 }
874
875 return -1; /* Status pending */
876 }
877
878 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
879 sm->pmk_r1_name_valid = 1;
880 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
881
882 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
883 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
884 "ANonce");
885 return WLAN_STATUS_UNSPECIFIED_FAILURE;
886 }
887
888 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
889 sm->SNonce, WPA_NONCE_LEN);
890 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
891 sm->ANonce, WPA_NONCE_LEN);
892
893 if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
894 sm->wpa_auth->addr, pmk_r1_name,
895 &sm->PTK, ptk_name, sm->wpa_key_mgmt,
896 pairwise) < 0)
897 return WLAN_STATUS_UNSPECIFIED_FAILURE;
898
899 sm->pairwise = pairwise;
900 sm->PTK_valid = TRUE;
901 wpa_ft_install_ptk(sm);
902
903 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
904 2 + FT_R1KH_ID_LEN + 200;
905 *resp_ies = os_zalloc(buflen);
906 if (*resp_ies == NULL) {
907 return WLAN_STATUS_UNSPECIFIED_FAILURE;
908 }
909
910 pos = *resp_ies;
911 end = *resp_ies + buflen;
912
913 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
914 if (ret < 0) {
915 os_free(*resp_ies);
916 *resp_ies = NULL;
917 return WLAN_STATUS_UNSPECIFIED_FAILURE;
918 }
919 pos += ret;
920
921 ret = wpa_write_mdie(conf, pos, end - pos);
922 if (ret < 0) {
923 os_free(*resp_ies);
924 *resp_ies = NULL;
925 return WLAN_STATUS_UNSPECIFIED_FAILURE;
926 }
927 pos += ret;
928
929 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
930 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
931 if (ret < 0) {
932 os_free(*resp_ies);
933 *resp_ies = NULL;
934 return WLAN_STATUS_UNSPECIFIED_FAILURE;
935 }
936 pos += ret;
937
938 *resp_ies_len = pos - *resp_ies;
939
940 return WLAN_STATUS_SUCCESS;
941 }
942
943
944 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
945 u16 auth_transaction, const u8 *ies, size_t ies_len,
946 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
947 u16 auth_transaction, u16 status,
948 const u8 *ies, size_t ies_len),
949 void *ctx)
950 {
951 u16 status;
952 u8 *resp_ies;
953 size_t resp_ies_len;
954 int res;
955
956 if (sm == NULL) {
957 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
958 "WPA SM not available");
959 return;
960 }
961
962 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
963 " BSSID=" MACSTR " transaction=%d",
964 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
965 sm->ft_pending_cb = cb;
966 sm->ft_pending_cb_ctx = ctx;
967 sm->ft_pending_auth_transaction = auth_transaction;
968 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
969 &resp_ies_len);
970 if (res < 0) {
971 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
972 return;
973 }
974 status = res;
975
976 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
977 " auth_transaction=%d status=%d",
978 MAC2STR(sm->addr), auth_transaction + 1, status);
979 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
980 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
981 resp_ies, resp_ies_len);
982 os_free(resp_ies);
983 }
984
985
986 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
987 size_t ies_len)
988 {
989 struct wpa_ft_ies parse;
990 struct rsn_mdie *mdie;
991 struct rsn_ftie *ftie;
992 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
993 size_t mic_len = 16;
994 unsigned int count;
995
996 if (sm == NULL)
997 return WLAN_STATUS_UNSPECIFIED_FAILURE;
998
999 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
1000
1001 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
1002 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
1003 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1004 }
1005
1006 if (parse.rsn == NULL) {
1007 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
1008 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1009 }
1010
1011 if (parse.rsn_pmkid == NULL) {
1012 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
1013 return WLAN_STATUS_INVALID_PMKID;
1014 }
1015
1016 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
1017 != 0) {
1018 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
1019 "with the PMKR1Name derived from auth request");
1020 return WLAN_STATUS_INVALID_PMKID;
1021 }
1022
1023 mdie = (struct rsn_mdie *) parse.mdie;
1024 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1025 os_memcmp(mdie->mobility_domain,
1026 sm->wpa_auth->conf.mobility_domain,
1027 MOBILITY_DOMAIN_ID_LEN) != 0) {
1028 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1029 return WLAN_STATUS_INVALID_MDIE;
1030 }
1031
1032 ftie = (struct rsn_ftie *) parse.ftie;
1033 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1034 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1035 return WLAN_STATUS_INVALID_FTIE;
1036 }
1037
1038 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
1039 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1040 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1041 ftie->snonce, WPA_NONCE_LEN);
1042 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1043 sm->SNonce, WPA_NONCE_LEN);
1044 return -1;
1045 }
1046
1047 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
1048 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1049 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1050 ftie->anonce, WPA_NONCE_LEN);
1051 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1052 sm->ANonce, WPA_NONCE_LEN);
1053 return -1;
1054 }
1055
1056
1057 if (parse.r0kh_id == NULL) {
1058 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1059 return -1;
1060 }
1061
1062 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1063 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1064 {
1065 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1066 "the current R0KH-ID");
1067 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1068 parse.r0kh_id, parse.r0kh_id_len);
1069 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1070 sm->r0kh_id, sm->r0kh_id_len);
1071 return -1;
1072 }
1073
1074 if (parse.r1kh_id == NULL) {
1075 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1076 return -1;
1077 }
1078
1079 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
1080 FT_R1KH_ID_LEN) != 0) {
1081 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1082 "ReassocReq");
1083 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
1084 parse.r1kh_id, FT_R1KH_ID_LEN);
1085 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
1086 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
1087 return -1;
1088 }
1089
1090 if (parse.rsn_pmkid == NULL ||
1091 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1092 {
1093 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1094 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1095 return -1;
1096 }
1097
1098 count = 3;
1099 if (parse.ric)
1100 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1101 if (ftie->mic_control[1] != count) {
1102 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1103 "Control: received %u expected %u",
1104 ftie->mic_control[1], count);
1105 return -1;
1106 }
1107
1108 if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
1109 sm->wpa_auth->addr, 5,
1110 parse.mdie - 2, parse.mdie_len + 2,
1111 parse.ftie - 2, parse.ftie_len + 2,
1112 parse.rsn - 2, parse.rsn_len + 2,
1113 parse.ric, parse.ric_len,
1114 mic) < 0) {
1115 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1116 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1117 }
1118
1119 if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) {
1120 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1121 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
1122 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
1123 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
1124 ftie->mic, mic_len);
1125 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
1126 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
1127 parse.mdie - 2, parse.mdie_len + 2);
1128 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
1129 parse.ftie - 2, parse.ftie_len + 2);
1130 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
1131 parse.rsn - 2, parse.rsn_len + 2);
1132 return WLAN_STATUS_INVALID_FTIE;
1133 }
1134
1135 return WLAN_STATUS_SUCCESS;
1136 }
1137
1138
1139 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1140 {
1141 const u8 *sta_addr, *target_ap;
1142 const u8 *ies;
1143 size_t ies_len;
1144 u8 action;
1145 struct ft_rrb_frame *frame;
1146
1147 if (sm == NULL)
1148 return -1;
1149
1150 /*
1151 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1152 * FT Request action frame body[variable]
1153 */
1154
1155 if (len < 14) {
1156 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1157 "(len=%lu)", (unsigned long) len);
1158 return -1;
1159 }
1160
1161 action = data[1];
1162 sta_addr = data + 2;
1163 target_ap = data + 8;
1164 ies = data + 14;
1165 ies_len = len - 14;
1166
1167 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1168 " Target AP=" MACSTR " Action=%d)",
1169 MAC2STR(sta_addr), MAC2STR(target_ap), action);
1170
1171 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1172 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1173 "STA=" MACSTR " STA-Address=" MACSTR,
1174 MAC2STR(sm->addr), MAC2STR(sta_addr));
1175 return -1;
1176 }
1177
1178 /*
1179 * Do some sanity checking on the target AP address (not own and not
1180 * broadcast. This could be extended to filter based on a list of known
1181 * APs in the MD (if such a list were configured).
1182 */
1183 if ((target_ap[0] & 0x01) ||
1184 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1185 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1186 "frame");
1187 return -1;
1188 }
1189
1190 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1191
1192 /* RRB - Forward action frame to the target AP */
1193 frame = os_malloc(sizeof(*frame) + len);
1194 if (frame == NULL)
1195 return -1;
1196 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1197 frame->packet_type = FT_PACKET_REQUEST;
1198 frame->action_length = host_to_le16(len);
1199 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1200 os_memcpy(frame + 1, data, len);
1201
1202 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1203 sizeof(*frame) + len);
1204 os_free(frame);
1205
1206 return 0;
1207 }
1208
1209
1210 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
1211 u16 auth_transaction, u16 resp,
1212 const u8 *ies, size_t ies_len)
1213 {
1214 struct wpa_state_machine *sm = ctx;
1215 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
1216 MAC2STR(sm->addr));
1217 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
1218 WLAN_STATUS_SUCCESS, ies, ies_len);
1219 }
1220
1221
1222 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1223 const u8 *current_ap, const u8 *sta_addr,
1224 const u8 *body, size_t len)
1225 {
1226 struct wpa_state_machine *sm;
1227 u16 status;
1228 u8 *resp_ies;
1229 size_t resp_ies_len;
1230 int res;
1231
1232 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1233 if (sm == NULL) {
1234 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1235 "RRB Request");
1236 return -1;
1237 }
1238
1239 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1240
1241 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
1242 sm->ft_pending_cb_ctx = sm;
1243 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
1244 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1245 &resp_ies_len);
1246 if (res < 0) {
1247 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
1248 return 0;
1249 }
1250 status = res;
1251
1252 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
1253 resp_ies, resp_ies_len);
1254 os_free(resp_ies);
1255 return res;
1256 }
1257
1258
1259 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
1260 const u8 *current_ap, const u8 *sta_addr,
1261 u16 status, const u8 *resp_ies,
1262 size_t resp_ies_len)
1263 {
1264 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
1265 size_t rlen;
1266 struct ft_rrb_frame *frame;
1267 u8 *pos;
1268
1269 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1270 " CurrentAP=" MACSTR " status=%d",
1271 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1272 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1273
1274 /* RRB - Forward action frame response to the Current AP */
1275
1276 /*
1277 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1278 * Status_Code[2] FT Request action frame body[variable]
1279 */
1280 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1281
1282 frame = os_malloc(sizeof(*frame) + rlen);
1283 if (frame == NULL)
1284 return -1;
1285 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1286 frame->packet_type = FT_PACKET_RESPONSE;
1287 frame->action_length = host_to_le16(rlen);
1288 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1289 pos = (u8 *) (frame + 1);
1290 *pos++ = WLAN_ACTION_FT;
1291 *pos++ = 2; /* Action: Response */
1292 os_memcpy(pos, sta_addr, ETH_ALEN);
1293 pos += ETH_ALEN;
1294 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1295 pos += ETH_ALEN;
1296 WPA_PUT_LE16(pos, status);
1297 pos += 2;
1298 if (resp_ies)
1299 os_memcpy(pos, resp_ies, resp_ies_len);
1300
1301 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1302 sizeof(*frame) + rlen);
1303 os_free(frame);
1304
1305 return 0;
1306 }
1307
1308
1309 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1310 const u8 *src_addr,
1311 const u8 *data, size_t data_len)
1312 {
1313 struct ft_r0kh_r1kh_pull_frame f;
1314 const u8 *crypt;
1315 u8 *plain;
1316 struct ft_remote_r1kh *r1kh;
1317 struct ft_r0kh_r1kh_resp_frame resp, r;
1318 u8 pmk_r0[PMK_LEN];
1319 int pairwise;
1320
1321 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1322
1323 if (data_len < sizeof(f))
1324 return -1;
1325
1326 r1kh = wpa_auth->conf.r1kh_list;
1327 while (r1kh) {
1328 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1329 break;
1330 r1kh = r1kh->next;
1331 }
1332 if (r1kh == NULL) {
1333 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1334 "PMK-R1 pull source address " MACSTR,
1335 MAC2STR(src_addr));
1336 return -1;
1337 }
1338
1339 crypt = data + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1340 os_memset(&f, 0, sizeof(f));
1341 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1342 /* aes_unwrap() does not support inplace decryption, so use a temporary
1343 * buffer for the data. */
1344 if (aes_unwrap(r1kh->key, sizeof(r1kh->key),
1345 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1346 crypt, plain) < 0) {
1347 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1348 "request from " MACSTR, MAC2STR(src_addr));
1349 return -1;
1350 }
1351
1352 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1353 f.nonce, sizeof(f.nonce));
1354 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1355 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1356 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1357 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1358
1359 os_memset(&resp, 0, sizeof(resp));
1360 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1361 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1362 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1363 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1364
1365 /* aes_wrap() does not support inplace encryption, so use a temporary
1366 * buffer for the data. */
1367 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1368 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1369 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1370 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1371 &pairwise) < 0) {
1372 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1373 "PMK-R1 pull");
1374 return -1;
1375 }
1376
1377 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1378 r.pmk_r1, r.pmk_r1_name);
1379 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1380 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1381 WPA_PMK_NAME_LEN);
1382 r.pairwise = host_to_le16(pairwise);
1383 os_memset(r.pad, 0, sizeof(r.pad));
1384
1385 if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1386 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1387 r.nonce, resp.nonce) < 0) {
1388 os_memset(pmk_r0, 0, PMK_LEN);
1389 return -1;
1390 }
1391
1392 os_memset(pmk_r0, 0, PMK_LEN);
1393
1394 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1395
1396 return 0;
1397 }
1398
1399
1400 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx)
1401 {
1402 struct wpa_state_machine *sm = eloop_ctx;
1403 int res;
1404 u8 *resp_ies;
1405 size_t resp_ies_len;
1406 u16 status;
1407
1408 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
1409 wpabuf_len(sm->ft_pending_req_ies),
1410 &resp_ies, &resp_ies_len);
1411 wpabuf_free(sm->ft_pending_req_ies);
1412 sm->ft_pending_req_ies = NULL;
1413 if (res < 0)
1414 res = WLAN_STATUS_UNSPECIFIED_FAILURE;
1415 status = res;
1416 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
1417 " - status %u", MAC2STR(sm->addr), status);
1418
1419 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
1420 sm->ft_pending_auth_transaction + 1, status,
1421 resp_ies, resp_ies_len);
1422 os_free(resp_ies);
1423 }
1424
1425
1426 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx)
1427 {
1428 struct ft_r0kh_r1kh_resp_frame *frame = ctx;
1429
1430 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0)
1431 return 0;
1432 if (os_memcmp(frame->nonce, sm->ft_pending_pull_nonce,
1433 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0)
1434 return 0;
1435 if (sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
1436 return 0;
1437
1438 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for "
1439 MACSTR " - process from timeout", MAC2STR(sm->addr));
1440 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL);
1441 return 1;
1442 }
1443
1444
1445 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1446 const u8 *src_addr,
1447 const u8 *data, size_t data_len)
1448 {
1449 struct ft_r0kh_r1kh_resp_frame f;
1450 const u8 *crypt;
1451 u8 *plain;
1452 struct ft_remote_r0kh *r0kh;
1453 int pairwise, res;
1454
1455 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1456
1457 if (data_len < sizeof(f))
1458 return -1;
1459
1460 r0kh = wpa_auth->conf.r0kh_list;
1461 while (r0kh) {
1462 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1463 break;
1464 r0kh = r0kh->next;
1465 }
1466 if (r0kh == NULL) {
1467 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1468 "PMK-R0 pull response source address " MACSTR,
1469 MAC2STR(src_addr));
1470 return -1;
1471 }
1472
1473 crypt = data + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1474 os_memset(&f, 0, sizeof(f));
1475 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1476 /* aes_unwrap() does not support inplace decryption, so use a temporary
1477 * buffer for the data. */
1478 if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1479 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1480 crypt, plain) < 0) {
1481 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1482 "response from " MACSTR, MAC2STR(src_addr));
1483 return -1;
1484 }
1485
1486 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1487 FT_R1KH_ID_LEN) != 0) {
1488 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1489 "matching R1KH-ID");
1490 return -1;
1491 }
1492
1493 pairwise = le_to_host16(f.pairwise);
1494 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1495 f.nonce, sizeof(f.nonce));
1496 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1497 MACSTR " pairwise=0x%x",
1498 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1499 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1500 f.pmk_r1, PMK_LEN);
1501 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1502 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1503
1504 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1505 pairwise);
1506 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request");
1507 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f);
1508 os_memset(f.pmk_r1, 0, PMK_LEN);
1509
1510 return res ? 0 : -1;
1511 }
1512
1513
1514 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1515 const u8 *src_addr,
1516 const u8 *data, size_t data_len)
1517 {
1518 struct ft_r0kh_r1kh_push_frame f;
1519 const u8 *crypt;
1520 u8 *plain;
1521 struct ft_remote_r0kh *r0kh;
1522 struct os_time now;
1523 os_time_t tsend;
1524 int pairwise;
1525
1526 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1527
1528 if (data_len < sizeof(f))
1529 return -1;
1530
1531 r0kh = wpa_auth->conf.r0kh_list;
1532 while (r0kh) {
1533 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1534 break;
1535 r0kh = r0kh->next;
1536 }
1537 if (r0kh == NULL) {
1538 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1539 "PMK-R0 push source address " MACSTR,
1540 MAC2STR(src_addr));
1541 return -1;
1542 }
1543
1544 crypt = data + offsetof(struct ft_r0kh_r1kh_push_frame, timestamp);
1545 os_memset(&f, 0, sizeof(f));
1546 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1547 timestamp);
1548 /* aes_unwrap() does not support inplace decryption, so use a temporary
1549 * buffer for the data. */
1550 if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1551 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1552 crypt, plain) < 0) {
1553 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1554 MACSTR, MAC2STR(src_addr));
1555 return -1;
1556 }
1557
1558 os_get_time(&now);
1559 tsend = WPA_GET_LE32(f.timestamp);
1560 if ((now.sec > tsend && now.sec - tsend > 60) ||
1561 (now.sec < tsend && tsend - now.sec > 60)) {
1562 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1563 "timestamp: sender time %d own time %d\n",
1564 (int) tsend, (int) now.sec);
1565 return -1;
1566 }
1567
1568 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1569 FT_R1KH_ID_LEN) != 0) {
1570 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1571 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1572 MAC2STR(f.r1kh_id),
1573 MAC2STR(wpa_auth->conf.r1_key_holder));
1574 return -1;
1575 }
1576
1577 pairwise = le_to_host16(f.pairwise);
1578 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1579 MACSTR " pairwise=0x%x",
1580 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1581 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1582 f.pmk_r1, PMK_LEN);
1583 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1584 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1585
1586 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1587 pairwise);
1588 os_memset(f.pmk_r1, 0, PMK_LEN);
1589
1590 return 0;
1591 }
1592
1593
1594 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1595 const u8 *data, size_t data_len)
1596 {
1597 struct ft_rrb_frame *frame;
1598 u16 alen;
1599 const u8 *pos, *end, *start;
1600 u8 action;
1601 const u8 *sta_addr, *target_ap_addr;
1602
1603 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1604 MAC2STR(src_addr));
1605
1606 if (data_len < sizeof(*frame)) {
1607 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1608 (unsigned long) data_len);
1609 return -1;
1610 }
1611
1612 pos = data;
1613 frame = (struct ft_rrb_frame *) pos;
1614 pos += sizeof(*frame);
1615
1616 alen = le_to_host16(frame->action_length);
1617 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1618 "action_length=%d ap_address=" MACSTR,
1619 frame->frame_type, frame->packet_type, alen,
1620 MAC2STR(frame->ap_address));
1621
1622 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1623 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1624 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1625 "unrecognized type %d", frame->frame_type);
1626 return -1;
1627 }
1628
1629 if (alen > data_len - sizeof(*frame)) {
1630 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1631 "frame");
1632 return -1;
1633 }
1634
1635 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1636 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1637 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1638 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1639 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1640 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1641
1642 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1643
1644 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1645 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1646 "room for Action Frame body); alen=%lu",
1647 (unsigned long) alen);
1648 return -1;
1649 }
1650 start = pos;
1651 end = pos + alen;
1652
1653 if (*pos != WLAN_ACTION_FT) {
1654 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1655 "%d", *pos);
1656 return -1;
1657 }
1658
1659 pos++;
1660 action = *pos++;
1661 sta_addr = pos;
1662 pos += ETH_ALEN;
1663 target_ap_addr = pos;
1664 pos += ETH_ALEN;
1665 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1666 MACSTR " target_ap_addr=" MACSTR,
1667 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1668
1669 if (frame->packet_type == FT_PACKET_REQUEST) {
1670 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1671
1672 if (action != 1) {
1673 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1674 "RRB Request", action);
1675 return -1;
1676 }
1677
1678 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1679 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1680 "RRB Request does not match with own "
1681 "address");
1682 return -1;
1683 }
1684
1685 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1686 sta_addr, pos, end - pos) < 0)
1687 return -1;
1688 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1689 u16 status_code;
1690
1691 if (end - pos < 2) {
1692 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1693 "code in RRB Response");
1694 return -1;
1695 }
1696 status_code = WPA_GET_LE16(pos);
1697 pos += 2;
1698
1699 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1700 "(status_code=%d)", status_code);
1701
1702 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1703 return -1;
1704 } else {
1705 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1706 "packet_type %d", frame->packet_type);
1707 return -1;
1708 }
1709
1710 if (end > pos) {
1711 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
1712 pos, end - pos);
1713 }
1714
1715 return 0;
1716 }
1717
1718
1719 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1720 struct wpa_ft_pmk_r0_sa *pmk_r0,
1721 struct ft_remote_r1kh *r1kh,
1722 const u8 *s1kh_id, int pairwise)
1723 {
1724 struct ft_r0kh_r1kh_push_frame frame, f;
1725 struct os_time now;
1726 const u8 *plain;
1727 u8 *crypt;
1728
1729 os_memset(&frame, 0, sizeof(frame));
1730 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1731 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1732 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1733 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1734
1735 /* aes_wrap() does not support inplace encryption, so use a temporary
1736 * buffer for the data. */
1737 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1738 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1739 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1740 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1741 s1kh_id, f.pmk_r1, f.pmk_r1_name);
1742 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1743 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1744 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1745 WPA_PMK_NAME_LEN);
1746 os_get_time(&now);
1747 WPA_PUT_LE32(f.timestamp, now.sec);
1748 f.pairwise = host_to_le16(pairwise);
1749 os_memset(f.pad, 0, sizeof(f.pad));
1750 plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1751 timestamp);
1752 crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame,
1753 timestamp);
1754 if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1755 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1756 plain, crypt) < 0)
1757 return;
1758
1759 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1760 }
1761
1762
1763 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1764 {
1765 struct wpa_ft_pmk_r0_sa *r0;
1766 struct ft_remote_r1kh *r1kh;
1767
1768 if (!wpa_auth->conf.pmk_r1_push)
1769 return;
1770
1771 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1772 while (r0) {
1773 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1774 break;
1775 r0 = r0->next;
1776 }
1777
1778 if (r0 == NULL || r0->pmk_r1_pushed)
1779 return;
1780 r0->pmk_r1_pushed = 1;
1781
1782 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1783 "for STA " MACSTR, MAC2STR(addr));
1784
1785 r1kh = wpa_auth->conf.r1kh_list;
1786 while (r1kh) {
1787 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1788 r1kh = r1kh->next;
1789 }
1790 }
1791
1792 #endif /* CONFIG_IEEE80211R */
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