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