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Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / ap / wpa_auth_ft.c
... / ...
CommitLineData
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
25static 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
36static 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
46static struct wpa_state_machine *
47wpa_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
55static 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
68int 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
88int 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
137struct 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
147struct 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
156struct wpa_ft_pmk_cache {
157 struct wpa_ft_pmk_r0_sa *pmk_r0;
158 struct wpa_ft_pmk_r1_sa *pmk_r1;
159};
160
161struct 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
171void 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
196static 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
221static 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
246static 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
271static 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
296static 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 os_memset(f.pad, 0, sizeof(f.pad));
333
334 if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
335 f.nonce, frame.nonce) < 0)
336 return -1;
337
338 wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
339
340 return 0;
341}
342
343
344int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
345 struct wpa_ptk *ptk, size_t ptk_len)
346{
347 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
348 u8 pmk_r1[PMK_LEN];
349 u8 ptk_name[WPA_PMK_NAME_LEN];
350 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
351 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
352 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
353 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
354 const u8 *ssid = sm->wpa_auth->conf.ssid;
355 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
356
357
358 if (sm->xxkey_len == 0) {
359 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
360 "derivation");
361 return -1;
362 }
363
364 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
365 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
366 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
367 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
368 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
369 sm->pairwise);
370
371 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
372 pmk_r1, sm->pmk_r1_name);
373 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
374 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
375 WPA_PMK_NAME_LEN);
376 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name,
377 sm->pairwise);
378
379 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
380 sm->wpa_auth->addr, sm->pmk_r1_name,
381 (u8 *) ptk, ptk_len, ptk_name);
382 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
383 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
384
385 return 0;
386}
387
388
389static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
390 const u8 *addr, int idx, u8 *seq)
391{
392 if (wpa_auth->cb.get_seqnum == NULL)
393 return -1;
394 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
395}
396
397
398static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
399{
400 u8 *subelem;
401 struct wpa_group *gsm = sm->group;
402 size_t subelem_len, pad_len;
403 const u8 *key;
404 size_t key_len;
405 u8 keybuf[32];
406
407 key_len = gsm->GTK_len;
408 if (key_len > sizeof(keybuf))
409 return NULL;
410
411 /*
412 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
413 * than 16 bytes.
414 */
415 pad_len = key_len % 8;
416 if (pad_len)
417 pad_len = 8 - pad_len;
418 if (key_len + pad_len < 16)
419 pad_len += 8;
420 if (pad_len && key_len < sizeof(keybuf)) {
421 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
422 os_memset(keybuf + key_len, 0, pad_len);
423 keybuf[key_len] = 0xdd;
424 key_len += pad_len;
425 key = keybuf;
426 } else
427 key = gsm->GTK[gsm->GN - 1];
428
429 /*
430 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
431 * Key[5..32].
432 */
433 subelem_len = 13 + key_len + 8;
434 subelem = os_zalloc(subelem_len);
435 if (subelem == NULL)
436 return NULL;
437
438 subelem[0] = FTIE_SUBELEM_GTK;
439 subelem[1] = 11 + key_len + 8;
440 /* Key ID in B0-B1 of Key Info */
441 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
442 subelem[4] = gsm->GTK_len;
443 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
444 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) {
445 os_free(subelem);
446 return NULL;
447 }
448
449 *len = subelem_len;
450 return subelem;
451}
452
453
454#ifdef CONFIG_IEEE80211W
455static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
456{
457 u8 *subelem, *pos;
458 struct wpa_group *gsm = sm->group;
459 size_t subelem_len;
460
461 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
462 * Key[16+8] */
463 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
464 subelem = os_zalloc(subelem_len);
465 if (subelem == NULL)
466 return NULL;
467
468 pos = subelem;
469 *pos++ = FTIE_SUBELEM_IGTK;
470 *pos++ = subelem_len - 2;
471 WPA_PUT_LE16(pos, gsm->GN_igtk);
472 pos += 2;
473 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
474 pos += 6;
475 *pos++ = WPA_IGTK_LEN;
476 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8,
477 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
478 os_free(subelem);
479 return NULL;
480 }
481
482 *len = subelem_len;
483 return subelem;
484}
485#endif /* CONFIG_IEEE80211W */
486
487
488static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
489 u8 *pos, u8 *end, u8 id, u8 descr_count,
490 const u8 *ies, size_t ies_len)
491{
492 struct ieee802_11_elems parse;
493 struct rsn_rdie *rdie;
494
495 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
496 id, descr_count);
497 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
498 ies, ies_len);
499
500 if (end - pos < (int) sizeof(*rdie)) {
501 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
502 return pos;
503 }
504
505 *pos++ = WLAN_EID_RIC_DATA;
506 *pos++ = sizeof(*rdie);
507 rdie = (struct rsn_rdie *) pos;
508 rdie->id = id;
509 rdie->descr_count = 0;
510 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
511 pos += sizeof(*rdie);
512
513 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
514 ParseFailed) {
515 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
516 rdie->status_code =
517 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
518 return pos;
519 }
520
521#ifdef NEED_AP_MLME
522 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
523 struct wmm_tspec_element *tspec;
524 int res;
525
526 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
527 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
528 "(%d)", (int) parse.wmm_tspec_len);
529 rdie->status_code =
530 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
531 return pos;
532 }
533 if (end - pos < (int) sizeof(*tspec)) {
534 wpa_printf(MSG_ERROR, "FT: Not enough room for "
535 "response TSPEC");
536 rdie->status_code =
537 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
538 return pos;
539 }
540 tspec = (struct wmm_tspec_element *) pos;
541 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
542 res = wmm_process_tspec(tspec);
543 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
544 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
545 rdie->status_code =
546 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
547 else if (res == WMM_ADDTS_STATUS_REFUSED)
548 rdie->status_code =
549 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
550 else {
551 /* TSPEC accepted; include updated TSPEC in response */
552 rdie->descr_count = 1;
553 pos += sizeof(*tspec);
554 }
555 return pos;
556 }
557#endif /* NEED_AP_MLME */
558
559 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
560 struct wmm_tspec_element *tspec;
561 int res;
562
563 tspec = (struct wmm_tspec_element *) pos;
564 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
565 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
566 sizeof(*tspec));
567 if (res >= 0) {
568 if (res)
569 rdie->status_code = host_to_le16(res);
570 else {
571 /* TSPEC accepted; include updated TSPEC in
572 * response */
573 rdie->descr_count = 1;
574 pos += sizeof(*tspec);
575 }
576 return pos;
577 }
578 }
579
580 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
581 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
582 return pos;
583}
584
585
586static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
587 const u8 *ric, size_t ric_len)
588{
589 const u8 *rpos, *start;
590 const struct rsn_rdie *rdie;
591
592 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
593
594 rpos = ric;
595 while (rpos + sizeof(*rdie) < ric + ric_len) {
596 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
597 rpos + 2 + rpos[1] > ric + ric_len)
598 break;
599 rdie = (const struct rsn_rdie *) (rpos + 2);
600 rpos += 2 + rpos[1];
601 start = rpos;
602
603 while (rpos + 2 <= ric + ric_len &&
604 rpos + 2 + rpos[1] <= ric + ric_len) {
605 if (rpos[0] == WLAN_EID_RIC_DATA)
606 break;
607 rpos += 2 + rpos[1];
608 }
609 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
610 rdie->descr_count,
611 start, rpos - start);
612 }
613
614 return pos;
615}
616
617
618u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
619 size_t max_len, int auth_alg,
620 const u8 *req_ies, size_t req_ies_len)
621{
622 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
623 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
624 int res;
625 struct wpa_auth_config *conf;
626 struct rsn_ftie *_ftie;
627 struct wpa_ft_ies parse;
628 u8 *ric_start;
629 u8 *anonce, *snonce;
630
631 if (sm == NULL)
632 return pos;
633
634 conf = &sm->wpa_auth->conf;
635
636 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
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
739static 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
751void 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
780static 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
933void 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
966u16 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
1114int 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 if (frame == NULL)
1170 return -1;
1171 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1172 frame->packet_type = FT_PACKET_REQUEST;
1173 frame->action_length = host_to_le16(len);
1174 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1175 os_memcpy(frame + 1, data, len);
1176
1177 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1178 sizeof(*frame) + len);
1179 os_free(frame);
1180
1181 return 0;
1182}
1183
1184
1185static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1186 const u8 *current_ap, const u8 *sta_addr,
1187 const u8 *body, size_t len)
1188{
1189 struct wpa_state_machine *sm;
1190 u16 status;
1191 u8 *resp_ies, *pos;
1192 size_t resp_ies_len, rlen;
1193 struct ft_rrb_frame *frame;
1194
1195 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1196 if (sm == NULL) {
1197 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1198 "RRB Request");
1199 return -1;
1200 }
1201
1202 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1203
1204 status = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1205 &resp_ies_len);
1206
1207 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1208 " CurrentAP=" MACSTR " status=%d",
1209 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1210 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1211
1212 /* RRB - Forward action frame response to the Current AP */
1213
1214 /*
1215 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1216 * Status_Code[2] FT Request action frame body[variable]
1217 */
1218 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1219
1220 frame = os_malloc(sizeof(*frame) + rlen);
1221 if (frame == NULL) {
1222 os_free(resp_ies);
1223 return -1;
1224 }
1225 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1226 frame->packet_type = FT_PACKET_RESPONSE;
1227 frame->action_length = host_to_le16(rlen);
1228 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1229 pos = (u8 *) (frame + 1);
1230 *pos++ = WLAN_ACTION_FT;
1231 *pos++ = 2; /* Action: Response */
1232 os_memcpy(pos, sta_addr, ETH_ALEN);
1233 pos += ETH_ALEN;
1234 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1235 pos += ETH_ALEN;
1236 WPA_PUT_LE16(pos, status);
1237 pos += 2;
1238 if (resp_ies) {
1239 os_memcpy(pos, resp_ies, resp_ies_len);
1240 os_free(resp_ies);
1241 }
1242
1243 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1244 sizeof(*frame) + rlen);
1245 os_free(frame);
1246
1247 return 0;
1248}
1249
1250
1251static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1252 const u8 *src_addr,
1253 const u8 *data, size_t data_len)
1254{
1255 struct ft_r0kh_r1kh_pull_frame *frame, f;
1256 struct ft_remote_r1kh *r1kh;
1257 struct ft_r0kh_r1kh_resp_frame resp, r;
1258 u8 pmk_r0[PMK_LEN];
1259 int pairwise;
1260
1261 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1262
1263 if (data_len < sizeof(*frame))
1264 return -1;
1265
1266 r1kh = wpa_auth->conf.r1kh_list;
1267 while (r1kh) {
1268 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1269 break;
1270 r1kh = r1kh->next;
1271 }
1272 if (r1kh == NULL) {
1273 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1274 "PMK-R1 pull source address " MACSTR,
1275 MAC2STR(src_addr));
1276 return -1;
1277 }
1278
1279 frame = (struct ft_r0kh_r1kh_pull_frame *) data;
1280 /* aes_unwrap() does not support inplace decryption, so use a temporary
1281 * buffer for the data. */
1282 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1283 frame->nonce, f.nonce) < 0) {
1284 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1285 "request from " MACSTR, MAC2STR(src_addr));
1286 return -1;
1287 }
1288
1289 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1290 f.nonce, sizeof(f.nonce));
1291 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1292 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1293 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1294 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1295
1296 os_memset(&resp, 0, sizeof(resp));
1297 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1298 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1299 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1300 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1301
1302 /* aes_wrap() does not support inplace encryption, so use a temporary
1303 * buffer for the data. */
1304 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1305 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1306 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1307 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1308 &pairwise) < 0) {
1309 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1310 "PMK-R1 pull");
1311 return -1;
1312 }
1313
1314 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1315 r.pmk_r1, r.pmk_r1_name);
1316 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1317 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1318 WPA_PMK_NAME_LEN);
1319 r.pairwise = host_to_le16(pairwise);
1320 os_memset(r.pad, 0, sizeof(r.pad));
1321
1322 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1323 r.nonce, resp.nonce) < 0) {
1324 os_memset(pmk_r0, 0, PMK_LEN);
1325 return -1;
1326 }
1327
1328 os_memset(pmk_r0, 0, PMK_LEN);
1329
1330 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1331
1332 return 0;
1333}
1334
1335
1336static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1337 const u8 *src_addr,
1338 const u8 *data, size_t data_len)
1339{
1340 struct ft_r0kh_r1kh_resp_frame *frame, f;
1341 struct ft_remote_r0kh *r0kh;
1342 int pairwise;
1343
1344 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1345
1346 if (data_len < sizeof(*frame))
1347 return -1;
1348
1349 r0kh = wpa_auth->conf.r0kh_list;
1350 while (r0kh) {
1351 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1352 break;
1353 r0kh = r0kh->next;
1354 }
1355 if (r0kh == NULL) {
1356 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1357 "PMK-R0 pull response source address " MACSTR,
1358 MAC2STR(src_addr));
1359 return -1;
1360 }
1361
1362 frame = (struct ft_r0kh_r1kh_resp_frame *) data;
1363 /* aes_unwrap() does not support inplace decryption, so use a temporary
1364 * buffer for the data. */
1365 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1366 frame->nonce, f.nonce) < 0) {
1367 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1368 "response from " MACSTR, MAC2STR(src_addr));
1369 return -1;
1370 }
1371
1372 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1373 != 0) {
1374 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1375 "matching R1KH-ID");
1376 return -1;
1377 }
1378
1379 /* TODO: verify that <nonce,s1kh_id> matches with a pending request
1380 * and call this requests callback function to finish request
1381 * processing */
1382
1383 pairwise = le_to_host16(f.pairwise);
1384 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1385 f.nonce, sizeof(f.nonce));
1386 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1387 MACSTR " pairwise=0x%x",
1388 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1389 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1390 f.pmk_r1, PMK_LEN);
1391 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1392 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1393
1394 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1395 pairwise);
1396 os_memset(f.pmk_r1, 0, PMK_LEN);
1397
1398 return 0;
1399}
1400
1401
1402static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1403 const u8 *src_addr,
1404 const u8 *data, size_t data_len)
1405{
1406 struct ft_r0kh_r1kh_push_frame *frame, f;
1407 struct ft_remote_r0kh *r0kh;
1408 struct os_time now;
1409 os_time_t tsend;
1410 int pairwise;
1411
1412 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1413
1414 if (data_len < sizeof(*frame))
1415 return -1;
1416
1417 r0kh = wpa_auth->conf.r0kh_list;
1418 while (r0kh) {
1419 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1420 break;
1421 r0kh = r0kh->next;
1422 }
1423 if (r0kh == NULL) {
1424 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1425 "PMK-R0 push source address " MACSTR,
1426 MAC2STR(src_addr));
1427 return -1;
1428 }
1429
1430 frame = (struct ft_r0kh_r1kh_push_frame *) data;
1431 /* aes_unwrap() does not support inplace decryption, so use a temporary
1432 * buffer for the data. */
1433 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1434 frame->timestamp, f.timestamp) < 0) {
1435 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1436 MACSTR, MAC2STR(src_addr));
1437 return -1;
1438 }
1439
1440 os_get_time(&now);
1441 tsend = WPA_GET_LE32(f.timestamp);
1442 if ((now.sec > tsend && now.sec - tsend > 60) ||
1443 (now.sec < tsend && tsend - now.sec > 60)) {
1444 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1445 "timestamp: sender time %d own time %d\n",
1446 (int) tsend, (int) now.sec);
1447 return -1;
1448 }
1449
1450 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1451 != 0) {
1452 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1453 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1454 MAC2STR(f.r1kh_id),
1455 MAC2STR(wpa_auth->conf.r1_key_holder));
1456 return -1;
1457 }
1458
1459 pairwise = le_to_host16(f.pairwise);
1460 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1461 MACSTR " pairwise=0x%x",
1462 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1463 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1464 f.pmk_r1, PMK_LEN);
1465 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1466 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1467
1468 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1469 pairwise);
1470 os_memset(f.pmk_r1, 0, PMK_LEN);
1471
1472 return 0;
1473}
1474
1475
1476int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1477 const u8 *data, size_t data_len)
1478{
1479 struct ft_rrb_frame *frame;
1480 u16 alen;
1481 const u8 *pos, *end, *start;
1482 u8 action;
1483 const u8 *sta_addr, *target_ap_addr;
1484
1485 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1486 MAC2STR(src_addr));
1487
1488 if (data_len < sizeof(*frame)) {
1489 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1490 (unsigned long) data_len);
1491 return -1;
1492 }
1493
1494 pos = data;
1495 frame = (struct ft_rrb_frame *) pos;
1496 pos += sizeof(*frame);
1497
1498 alen = le_to_host16(frame->action_length);
1499 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1500 "action_length=%d ap_address=" MACSTR,
1501 frame->frame_type, frame->packet_type, alen,
1502 MAC2STR(frame->ap_address));
1503
1504 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1505 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1506 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1507 "unrecognized type %d", frame->frame_type);
1508 return -1;
1509 }
1510
1511 if (alen > data_len - sizeof(*frame)) {
1512 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1513 "frame");
1514 return -1;
1515 }
1516
1517 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1518 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1519 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1520 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1521 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1522 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1523
1524 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1525
1526 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1527 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1528 "room for Action Frame body); alen=%lu",
1529 (unsigned long) alen);
1530 return -1;
1531 }
1532 start = pos;
1533 end = pos + alen;
1534
1535 if (*pos != WLAN_ACTION_FT) {
1536 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1537 "%d", *pos);
1538 return -1;
1539 }
1540
1541 pos++;
1542 action = *pos++;
1543 sta_addr = pos;
1544 pos += ETH_ALEN;
1545 target_ap_addr = pos;
1546 pos += ETH_ALEN;
1547 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1548 MACSTR " target_ap_addr=" MACSTR,
1549 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1550
1551 if (frame->packet_type == FT_PACKET_REQUEST) {
1552 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1553
1554 if (action != 1) {
1555 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1556 "RRB Request", action);
1557 return -1;
1558 }
1559
1560 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1561 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1562 "RRB Request does not match with own "
1563 "address");
1564 return -1;
1565 }
1566
1567 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1568 sta_addr, pos, end - pos) < 0)
1569 return -1;
1570 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1571 u16 status_code;
1572
1573 if (end - pos < 2) {
1574 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1575 "code in RRB Response");
1576 return -1;
1577 }
1578 status_code = WPA_GET_LE16(pos);
1579 pos += 2;
1580
1581 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1582 "(status_code=%d)", status_code);
1583
1584 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1585 return -1;
1586 } else {
1587 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1588 "packet_type %d", frame->packet_type);
1589 return -1;
1590 }
1591
1592 return 0;
1593}
1594
1595
1596static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1597 struct wpa_ft_pmk_r0_sa *pmk_r0,
1598 struct ft_remote_r1kh *r1kh,
1599 const u8 *s1kh_id, int pairwise)
1600{
1601 struct ft_r0kh_r1kh_push_frame frame, f;
1602 struct os_time now;
1603
1604 os_memset(&frame, 0, sizeof(frame));
1605 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1606 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1607 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1608 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1609
1610 /* aes_wrap() does not support inplace encryption, so use a temporary
1611 * buffer for the data. */
1612 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1613 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1614 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1615 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1616 s1kh_id, f.pmk_r1, f.pmk_r1_name);
1617 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1618 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1619 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1620 WPA_PMK_NAME_LEN);
1621 os_get_time(&now);
1622 WPA_PUT_LE32(f.timestamp, now.sec);
1623 f.pairwise = host_to_le16(pairwise);
1624 os_memset(f.pad, 0, sizeof(f.pad));
1625 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1626 f.timestamp, frame.timestamp) < 0)
1627 return;
1628
1629 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1630}
1631
1632
1633void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1634{
1635 struct wpa_ft_pmk_r0_sa *r0;
1636 struct ft_remote_r1kh *r1kh;
1637
1638 if (!wpa_auth->conf.pmk_r1_push)
1639 return;
1640
1641 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1642 while (r0) {
1643 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1644 break;
1645 r0 = r0->next;
1646 }
1647
1648 if (r0 == NULL || r0->pmk_r1_pushed)
1649 return;
1650 r0->pmk_r1_pushed = 1;
1651
1652 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1653 "for STA " MACSTR, MAC2STR(addr));
1654
1655 r1kh = wpa_auth->conf.r1kh_list;
1656 while (r1kh) {
1657 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1658 r1kh = r1kh->next;
1659 }
1660}
1661
1662#endif /* CONFIG_IEEE80211R */
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