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FT: Validate protect IE count in FTIE MIC Control
[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 program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "utils/includes.h"
16
17 #include "utils/common.h"
18 #include "common/ieee802_11_defs.h"
19 #include "common/ieee802_11_common.h"
20 #include "crypto/aes_wrap.h"
21 #include "ap_config.h"
22 #include "ieee802_11.h"
23 #include "wmm.h"
24 #include "wpa_auth.h"
25 #include "wpa_auth_i.h"
26 #include "wpa_auth_ie.h"
27
28
29 #ifdef CONFIG_IEEE80211R
30
31 struct wpa_ft_ies {
32 const u8 *mdie;
33 size_t mdie_len;
34 const u8 *ftie;
35 size_t ftie_len;
36 const u8 *r1kh_id;
37 const u8 *gtk;
38 size_t gtk_len;
39 const u8 *r0kh_id;
40 size_t r0kh_id_len;
41 const u8 *rsn;
42 size_t rsn_len;
43 const u8 *rsn_pmkid;
44 const u8 *ric;
45 size_t ric_len;
46 };
47
48
49 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
50 struct wpa_ft_ies *parse);
51
52
53 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
54 const u8 *data, size_t data_len)
55 {
56 if (wpa_auth->cb.send_ether == NULL)
57 return -1;
58 return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
59 data, data_len);
60 }
61
62
63 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
64 const u8 *dst, const u8 *data, size_t data_len)
65 {
66 if (wpa_auth->cb.send_ft_action == NULL)
67 return -1;
68 return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
69 data, data_len);
70 }
71
72
73 static struct wpa_state_machine *
74 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
75 {
76 if (wpa_auth->cb.add_sta == NULL)
77 return NULL;
78 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
79 }
80
81
82 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
83 {
84 u8 *pos = buf;
85 u8 capab;
86 if (len < 2 + sizeof(struct rsn_mdie))
87 return -1;
88
89 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
90 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
91 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
92 pos += MOBILITY_DOMAIN_ID_LEN;
93 capab = RSN_FT_CAPAB_FT_OVER_DS;
94 *pos++ = capab;
95
96 return pos - buf;
97 }
98
99
100 static int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
101 size_t r0kh_id_len,
102 const u8 *anonce, const u8 *snonce,
103 u8 *buf, size_t len, const u8 *subelem,
104 size_t subelem_len)
105 {
106 u8 *pos = buf, *ielen;
107 struct rsn_ftie *hdr;
108
109 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
110 subelem_len)
111 return -1;
112
113 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
114 ielen = pos++;
115
116 hdr = (struct rsn_ftie *) pos;
117 os_memset(hdr, 0, sizeof(*hdr));
118 pos += sizeof(*hdr);
119 WPA_PUT_LE16(hdr->mic_control, 0);
120 if (anonce)
121 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
122 if (snonce)
123 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
124
125 /* Optional Parameters */
126 *pos++ = FTIE_SUBELEM_R1KH_ID;
127 *pos++ = FT_R1KH_ID_LEN;
128 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
129 pos += FT_R1KH_ID_LEN;
130
131 if (r0kh_id) {
132 *pos++ = FTIE_SUBELEM_R0KH_ID;
133 *pos++ = r0kh_id_len;
134 os_memcpy(pos, r0kh_id, r0kh_id_len);
135 pos += r0kh_id_len;
136 }
137
138 if (subelem) {
139 os_memcpy(pos, subelem, subelem_len);
140 pos += subelem_len;
141 }
142
143 *ielen = pos - buf - 2;
144
145 return pos - buf;
146 }
147
148
149 struct wpa_ft_pmk_r0_sa {
150 struct wpa_ft_pmk_r0_sa *next;
151 u8 pmk_r0[PMK_LEN];
152 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
153 u8 spa[ETH_ALEN];
154 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
155 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
156 int pmk_r1_pushed;
157 };
158
159 struct wpa_ft_pmk_r1_sa {
160 struct wpa_ft_pmk_r1_sa *next;
161 u8 pmk_r1[PMK_LEN];
162 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
163 u8 spa[ETH_ALEN];
164 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
165 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
166 };
167
168 struct wpa_ft_pmk_cache {
169 struct wpa_ft_pmk_r0_sa *pmk_r0;
170 struct wpa_ft_pmk_r1_sa *pmk_r1;
171 };
172
173 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
174 {
175 struct wpa_ft_pmk_cache *cache;
176
177 cache = os_zalloc(sizeof(*cache));
178
179 return cache;
180 }
181
182
183 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
184 {
185 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
186 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
187
188 r0 = cache->pmk_r0;
189 while (r0) {
190 r0prev = r0;
191 r0 = r0->next;
192 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
193 os_free(r0prev);
194 }
195
196 r1 = cache->pmk_r1;
197 while (r1) {
198 r1prev = r1;
199 r1 = r1->next;
200 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
201 os_free(r1prev);
202 }
203
204 os_free(cache);
205 }
206
207
208 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
209 const u8 *spa, const u8 *pmk_r0,
210 const u8 *pmk_r0_name, int pairwise)
211 {
212 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
213 struct wpa_ft_pmk_r0_sa *r0;
214
215 /* TODO: add expiration and limit on number of entries in cache */
216
217 r0 = os_zalloc(sizeof(*r0));
218 if (r0 == NULL)
219 return -1;
220
221 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
222 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
223 os_memcpy(r0->spa, spa, ETH_ALEN);
224 r0->pairwise = pairwise;
225
226 r0->next = cache->pmk_r0;
227 cache->pmk_r0 = r0;
228
229 return 0;
230 }
231
232
233 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
234 const u8 *spa, const u8 *pmk_r0_name,
235 u8 *pmk_r0, int *pairwise)
236 {
237 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
238 struct wpa_ft_pmk_r0_sa *r0;
239
240 r0 = cache->pmk_r0;
241 while (r0) {
242 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
243 os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN)
244 == 0) {
245 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
246 if (pairwise)
247 *pairwise = r0->pairwise;
248 return 0;
249 }
250
251 r0 = r0->next;
252 }
253
254 return -1;
255 }
256
257
258 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
259 const u8 *spa, const u8 *pmk_r1,
260 const u8 *pmk_r1_name, int pairwise)
261 {
262 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
263 struct wpa_ft_pmk_r1_sa *r1;
264
265 /* TODO: add expiration and limit on number of entries in cache */
266
267 r1 = os_zalloc(sizeof(*r1));
268 if (r1 == NULL)
269 return -1;
270
271 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
272 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
273 os_memcpy(r1->spa, spa, ETH_ALEN);
274 r1->pairwise = pairwise;
275
276 r1->next = cache->pmk_r1;
277 cache->pmk_r1 = r1;
278
279 return 0;
280 }
281
282
283 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
284 const u8 *spa, const u8 *pmk_r1_name,
285 u8 *pmk_r1, int *pairwise)
286 {
287 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
288 struct wpa_ft_pmk_r1_sa *r1;
289
290 r1 = cache->pmk_r1;
291 while (r1) {
292 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
293 os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN)
294 == 0) {
295 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
296 if (pairwise)
297 *pairwise = r1->pairwise;
298 return 0;
299 }
300
301 r1 = r1->next;
302 }
303
304 return -1;
305 }
306
307
308 static int wpa_ft_pull_pmk_r1(struct wpa_authenticator *wpa_auth,
309 const u8 *s1kh_id, const u8 *r0kh_id,
310 size_t r0kh_id_len, const u8 *pmk_r0_name)
311 {
312 struct ft_remote_r0kh *r0kh;
313 struct ft_r0kh_r1kh_pull_frame frame, f;
314
315 r0kh = wpa_auth->conf.r0kh_list;
316 while (r0kh) {
317 if (r0kh->id_len == r0kh_id_len &&
318 os_memcmp(r0kh->id, r0kh_id, r0kh_id_len) == 0)
319 break;
320 r0kh = r0kh->next;
321 }
322 if (r0kh == NULL)
323 return -1;
324
325 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
326 "address " MACSTR, MAC2STR(r0kh->addr));
327
328 os_memset(&frame, 0, sizeof(frame));
329 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
330 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
331 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
332 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
333
334 /* aes_wrap() does not support inplace encryption, so use a temporary
335 * buffer for the data. */
336 if (os_get_random(f.nonce, sizeof(f.nonce))) {
337 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
338 "nonce");
339 return -1;
340 }
341 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
342 os_memcpy(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
343 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
344
345 if (aes_wrap(r0kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
346 f.nonce, frame.nonce) < 0)
347 return -1;
348
349 wpa_ft_rrb_send(wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
350
351 return 0;
352 }
353
354
355 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
356 struct wpa_ptk *ptk, size_t ptk_len)
357 {
358 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
359 u8 pmk_r1[PMK_LEN];
360 u8 ptk_name[WPA_PMK_NAME_LEN];
361 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
362 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
363 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
364 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
365 const u8 *ssid = sm->wpa_auth->conf.ssid;
366 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
367
368
369 if (sm->xxkey_len == 0) {
370 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
371 "derivation");
372 return -1;
373 }
374
375 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
376 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
377 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
378 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
379 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
380 sm->pairwise);
381
382 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
383 pmk_r1, sm->pmk_r1_name);
384 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
385 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
386 WPA_PMK_NAME_LEN);
387 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name,
388 sm->pairwise);
389
390 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
391 sm->wpa_auth->addr, sm->pmk_r1_name,
392 (u8 *) ptk, ptk_len, ptk_name);
393 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
394 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
395
396 return 0;
397 }
398
399
400 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
401 const u8 *addr, int idx, u8 *seq)
402 {
403 if (wpa_auth->cb.get_seqnum == NULL)
404 return -1;
405 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
406 }
407
408
409 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
410 {
411 u8 *subelem;
412 struct wpa_group *gsm = sm->group;
413 size_t subelem_len, pad_len;
414 const u8 *key;
415 size_t key_len;
416 u8 keybuf[32];
417
418 key_len = gsm->GTK_len;
419 if (key_len > sizeof(keybuf))
420 return NULL;
421
422 /*
423 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
424 * than 16 bytes.
425 */
426 pad_len = key_len % 8;
427 if (pad_len)
428 pad_len = 8 - pad_len;
429 if (key_len + pad_len < 16)
430 pad_len += 8;
431 if (pad_len) {
432 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
433 os_memset(keybuf + key_len, 0, pad_len);
434 keybuf[key_len] = 0xdd;
435 key_len += pad_len;
436 key = keybuf;
437 } else
438 key = gsm->GTK[gsm->GN - 1];
439
440 /*
441 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
442 * Key[5..32].
443 */
444 subelem_len = 13 + key_len + 8;
445 subelem = os_zalloc(subelem_len);
446 if (subelem == NULL)
447 return NULL;
448
449 subelem[0] = FTIE_SUBELEM_GTK;
450 subelem[1] = 11 + key_len + 8;
451 /* Key ID in B0-B1 of Key Info */
452 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
453 subelem[4] = gsm->GTK_len;
454 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
455 if (aes_wrap(sm->PTK.kek, key_len / 8, key, subelem + 13)) {
456 os_free(subelem);
457 return NULL;
458 }
459
460 *len = subelem_len;
461 return subelem;
462 }
463
464
465 #ifdef CONFIG_IEEE80211W
466 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
467 {
468 u8 *subelem, *pos;
469 struct wpa_group *gsm = sm->group;
470 size_t subelem_len;
471
472 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
473 * Key[16+8] */
474 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
475 subelem = os_zalloc(subelem_len);
476 if (subelem == NULL)
477 return NULL;
478
479 pos = subelem;
480 *pos++ = FTIE_SUBELEM_IGTK;
481 *pos++ = subelem_len - 2;
482 WPA_PUT_LE16(pos, gsm->GN_igtk);
483 pos += 2;
484 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
485 pos += 6;
486 *pos++ = WPA_IGTK_LEN;
487 if (aes_wrap(sm->PTK.kek, WPA_IGTK_LEN / 8,
488 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
489 os_free(subelem);
490 return NULL;
491 }
492
493 *len = subelem_len;
494 return subelem;
495 }
496 #endif /* CONFIG_IEEE80211W */
497
498
499 static u8 * wpa_ft_process_rdie(u8 *pos, u8 *end, u8 id, u8 descr_count,
500 const u8 *ies, size_t ies_len)
501 {
502 struct ieee802_11_elems parse;
503 struct rsn_rdie *rdie;
504
505 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
506 id, descr_count);
507 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
508 ies, ies_len);
509
510 if (end - pos < (int) sizeof(*rdie)) {
511 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
512 return pos;
513 }
514
515 *pos++ = WLAN_EID_RIC_DATA;
516 *pos++ = sizeof(*rdie);
517 rdie = (struct rsn_rdie *) pos;
518 rdie->id = id;
519 rdie->descr_count = 0;
520 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
521 pos += sizeof(*rdie);
522
523 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
524 ParseFailed) {
525 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
526 rdie->status_code =
527 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
528 return pos;
529 }
530
531 #ifdef NEED_AP_MLME
532 if (parse.wmm_tspec) {
533 struct wmm_tspec_element *tspec;
534 int res;
535
536 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
537 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
538 "(%d)", (int) parse.wmm_tspec_len);
539 rdie->status_code =
540 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
541 return pos;
542 }
543 if (end - pos < (int) sizeof(*tspec)) {
544 wpa_printf(MSG_ERROR, "FT: Not enough room for "
545 "response TSPEC");
546 rdie->status_code =
547 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
548 return pos;
549 }
550 tspec = (struct wmm_tspec_element *) pos;
551 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
552 res = wmm_process_tspec(tspec);
553 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
554 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
555 rdie->status_code =
556 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
557 else if (res == WMM_ADDTS_STATUS_REFUSED)
558 rdie->status_code =
559 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
560 else {
561 /* TSPEC accepted; include updated TSPEC in response */
562 rdie->descr_count = 1;
563 pos += sizeof(*tspec);
564 }
565 return pos;
566 }
567 #endif /* NEED_AP_MLME */
568
569 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
570 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
571 return pos;
572 }
573
574
575 static u8 * wpa_ft_process_ric(u8 *pos, u8 *end, const u8 *ric, size_t ric_len)
576 {
577 const u8 *rpos, *start;
578 const struct rsn_rdie *rdie;
579
580 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
581
582 rpos = ric;
583 while (rpos + sizeof(*rdie) < ric + ric_len) {
584 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
585 rpos + 2 + rpos[1] > ric + ric_len)
586 break;
587 rdie = (const struct rsn_rdie *) (rpos + 2);
588 rpos += 2 + rpos[1];
589 start = rpos;
590
591 while (rpos + 2 <= ric + ric_len &&
592 rpos + 2 + rpos[1] <= ric + ric_len) {
593 if (rpos[0] == WLAN_EID_RIC_DATA)
594 break;
595 rpos += 2 + rpos[1];
596 }
597 pos = wpa_ft_process_rdie(pos, end, rdie->id,
598 rdie->descr_count,
599 start, rpos - start);
600 }
601
602 return pos;
603 }
604
605
606 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
607 size_t max_len, int auth_alg,
608 const u8 *req_ies, size_t req_ies_len)
609 {
610 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
611 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
612 int res;
613 struct wpa_auth_config *conf;
614 struct rsn_ftie *_ftie;
615 struct wpa_ft_ies parse;
616 u8 *ric_start;
617 u8 *anonce, *snonce;
618
619 if (sm == NULL)
620 return pos;
621
622 conf = &sm->wpa_auth->conf;
623
624 if (sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
625 sm->wpa_key_mgmt != WPA_KEY_MGMT_FT_PSK)
626 return pos;
627
628 end = pos + max_len;
629
630 if (auth_alg == WLAN_AUTH_FT) {
631 /*
632 * RSN (only present if this is a Reassociation Response and
633 * part of a fast BSS transition)
634 */
635 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
636 if (res < 0)
637 return pos;
638 rsnie = pos;
639 rsnie_len = res;
640 pos += res;
641 }
642
643 /* Mobility Domain Information */
644 res = wpa_write_mdie(conf, pos, end - pos);
645 if (res < 0)
646 return pos;
647 mdie = pos;
648 mdie_len = res;
649 pos += res;
650
651 /* Fast BSS Transition Information */
652 if (auth_alg == WLAN_AUTH_FT) {
653 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
654 r0kh_id = sm->r0kh_id;
655 r0kh_id_len = sm->r0kh_id_len;
656 anonce = sm->ANonce;
657 snonce = sm->SNonce;
658 #ifdef CONFIG_IEEE80211W
659 if (sm->mgmt_frame_prot) {
660 u8 *igtk;
661 size_t igtk_len;
662 u8 *nbuf;
663 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
664 if (igtk == NULL) {
665 os_free(subelem);
666 return pos;
667 }
668 nbuf = os_realloc(subelem, subelem_len + igtk_len);
669 if (nbuf == NULL) {
670 os_free(subelem);
671 os_free(igtk);
672 return pos;
673 }
674 subelem = nbuf;
675 os_memcpy(subelem + subelem_len, igtk, igtk_len);
676 subelem_len += igtk_len;
677 os_free(igtk);
678 }
679 #endif /* CONFIG_IEEE80211W */
680 } else {
681 r0kh_id = conf->r0_key_holder;
682 r0kh_id_len = conf->r0_key_holder_len;
683 anonce = NULL;
684 snonce = NULL;
685 }
686 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
687 end - pos, subelem, subelem_len);
688 os_free(subelem);
689 if (res < 0)
690 return pos;
691 ftie = pos;
692 ftie_len = res;
693 pos += res;
694
695 _ftie = (struct rsn_ftie *) (ftie + 2);
696 if (auth_alg == WLAN_AUTH_FT)
697 _ftie->mic_control[1] = 3; /* Information element count */
698
699 ric_start = pos;
700 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
701 pos = wpa_ft_process_ric(pos, end, parse.ric, parse.ric_len);
702 if (auth_alg == WLAN_AUTH_FT)
703 _ftie->mic_control[1] +=
704 ieee802_11_ie_count(ric_start,
705 pos - ric_start);
706 }
707 if (ric_start == pos)
708 ric_start = NULL;
709
710 if (auth_alg == WLAN_AUTH_FT &&
711 wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6,
712 mdie, mdie_len, ftie, ftie_len,
713 rsnie, rsnie_len,
714 ric_start, ric_start ? pos - ric_start : 0,
715 _ftie->mic) < 0)
716 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
717
718 return pos;
719 }
720
721
722 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
723 struct wpa_ft_ies *parse)
724 {
725 const u8 *end, *pos;
726
727 parse->ftie = ie;
728 parse->ftie_len = ie_len;
729
730 pos = ie + sizeof(struct rsn_ftie);
731 end = ie + ie_len;
732
733 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
734 switch (pos[0]) {
735 case FTIE_SUBELEM_R1KH_ID:
736 if (pos[1] != FT_R1KH_ID_LEN) {
737 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
738 "length in FTIE: %d", pos[1]);
739 return -1;
740 }
741 parse->r1kh_id = pos + 2;
742 break;
743 case FTIE_SUBELEM_GTK:
744 parse->gtk = pos + 2;
745 parse->gtk_len = pos[1];
746 break;
747 case FTIE_SUBELEM_R0KH_ID:
748 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
749 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
750 "length in FTIE: %d", pos[1]);
751 return -1;
752 }
753 parse->r0kh_id = pos + 2;
754 parse->r0kh_id_len = pos[1];
755 break;
756 }
757
758 pos += 2 + pos[1];
759 }
760
761 return 0;
762 }
763
764
765 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
766 struct wpa_ft_ies *parse)
767 {
768 const u8 *end, *pos;
769 struct wpa_ie_data data;
770 int ret;
771 const struct rsn_ftie *ftie;
772 int prot_ie_count = 0;
773
774 os_memset(parse, 0, sizeof(*parse));
775 if (ies == NULL)
776 return 0;
777
778 pos = ies;
779 end = ies + ies_len;
780 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
781 switch (pos[0]) {
782 case WLAN_EID_RSN:
783 parse->rsn = pos + 2;
784 parse->rsn_len = pos[1];
785 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
786 parse->rsn_len + 2,
787 &data);
788 if (ret < 0) {
789 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
790 "RSN IE: %d", ret);
791 return -1;
792 }
793 if (data.num_pmkid == 1 && data.pmkid)
794 parse->rsn_pmkid = data.pmkid;
795 break;
796 case WLAN_EID_MOBILITY_DOMAIN:
797 parse->mdie = pos + 2;
798 parse->mdie_len = pos[1];
799 break;
800 case WLAN_EID_FAST_BSS_TRANSITION:
801 if (pos[1] < sizeof(*ftie))
802 return -1;
803 ftie = (const struct rsn_ftie *) (pos + 2);
804 prot_ie_count = ftie->mic_control[1];
805 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
806 return -1;
807 break;
808 case WLAN_EID_RIC_DATA:
809 if (parse->ric == NULL)
810 parse->ric = pos;
811 }
812
813 pos += 2 + pos[1];
814 }
815
816 if (prot_ie_count == 0)
817 return 0; /* no MIC */
818
819 /*
820 * Check that the protected IE count matches with IEs included in the
821 * frame.
822 */
823 if (parse->rsn)
824 prot_ie_count--;
825 if (parse->mdie)
826 prot_ie_count--;
827 if (parse->ftie)
828 prot_ie_count--;
829 if (prot_ie_count < 0) {
830 wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in "
831 "the protected IE count");
832 return -1;
833 }
834
835 if (prot_ie_count == 0 && parse->ric) {
836 wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not "
837 "included in protected IE count");
838 return -1;
839 }
840
841 /* Determine the end of the RIC IE(s) */
842 pos = parse->ric;
843 while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end &&
844 prot_ie_count) {
845 prot_ie_count--;
846 pos += 2 + pos[1];
847 }
848 parse->ric_len = pos - parse->ric;
849 if (prot_ie_count) {
850 wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from "
851 "frame", (int) prot_ie_count);
852 return -1;
853 }
854
855 return 0;
856 }
857
858
859 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
860 int vlan_id,
861 enum wpa_alg alg, const u8 *addr, int idx,
862 u8 *key, size_t key_len)
863 {
864 if (wpa_auth->cb.set_key == NULL)
865 return -1;
866 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
867 key, key_len);
868 }
869
870
871 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
872 {
873 enum wpa_alg alg;
874 int klen;
875
876 /* MLME-SETKEYS.request(PTK) */
877 if (sm->pairwise == WPA_CIPHER_TKIP) {
878 alg = WPA_ALG_TKIP;
879 klen = 32;
880 } else if (sm->pairwise == WPA_CIPHER_CCMP) {
881 alg = WPA_ALG_CCMP;
882 klen = 16;
883 } else {
884 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
885 "PTK configuration", sm->pairwise);
886 return;
887 }
888
889 /* FIX: add STA entry to kernel/driver here? The set_key will fail
890 * most likely without this.. At the moment, STA entry is added only
891 * after association has been completed. This function will be called
892 * again after association to get the PTK configured, but that could be
893 * optimized by adding the STA entry earlier.
894 */
895 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
896 sm->PTK.tk1, klen))
897 return;
898
899 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
900 sm->pairwise_set = TRUE;
901 }
902
903
904 static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
905 const u8 *ies, size_t ies_len,
906 u8 **resp_ies, size_t *resp_ies_len)
907 {
908 struct rsn_mdie *mdie;
909 struct rsn_ftie *ftie;
910 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
911 u8 ptk_name[WPA_PMK_NAME_LEN];
912 struct wpa_auth_config *conf;
913 struct wpa_ft_ies parse;
914 size_t buflen, ptk_len;
915 int ret;
916 u8 *pos, *end;
917 int pairwise;
918
919 *resp_ies = NULL;
920 *resp_ies_len = 0;
921
922 sm->pmk_r1_name_valid = 0;
923 conf = &sm->wpa_auth->conf;
924
925 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
926 ies, ies_len);
927
928 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
929 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
930 return WLAN_STATUS_UNSPECIFIED_FAILURE;
931 }
932
933 mdie = (struct rsn_mdie *) parse.mdie;
934 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
935 os_memcmp(mdie->mobility_domain,
936 sm->wpa_auth->conf.mobility_domain,
937 MOBILITY_DOMAIN_ID_LEN) != 0) {
938 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
939 return WLAN_STATUS_INVALID_MDIE;
940 }
941
942 ftie = (struct rsn_ftie *) parse.ftie;
943 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
944 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
945 return WLAN_STATUS_INVALID_FTIE;
946 }
947
948 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
949
950 if (parse.r0kh_id == NULL) {
951 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
952 return WLAN_STATUS_INVALID_FTIE;
953 }
954
955 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
956 parse.r0kh_id, parse.r0kh_id_len);
957 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
958 sm->r0kh_id_len = parse.r0kh_id_len;
959
960 if (parse.rsn_pmkid == NULL) {
961 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
962 return WLAN_STATUS_INVALID_PMKID;
963 }
964
965 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
966 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
967 wpa_derive_pmk_r1_name(parse.rsn_pmkid,
968 sm->wpa_auth->conf.r1_key_holder, sm->addr,
969 pmk_r1_name);
970 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
971 pmk_r1_name, WPA_PMK_NAME_LEN);
972
973 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1,
974 &pairwise) < 0) {
975 if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id,
976 sm->r0kh_id_len, parse.rsn_pmkid) < 0) {
977 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
978 "PMK-R1 and unknown R0KH-ID");
979 return WLAN_STATUS_INVALID_PMKID;
980 }
981
982 /*
983 * TODO: Should return "status pending" (and the caller should
984 * not send out response now). The real response will be sent
985 * once the response from R0KH is received.
986 */
987 return WLAN_STATUS_INVALID_PMKID;
988 }
989
990 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
991 sm->pmk_r1_name_valid = 1;
992 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
993
994 if (os_get_random(sm->ANonce, WPA_NONCE_LEN)) {
995 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
996 "ANonce");
997 return WLAN_STATUS_UNSPECIFIED_FAILURE;
998 }
999
1000 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1001 sm->SNonce, WPA_NONCE_LEN);
1002 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
1003 sm->ANonce, WPA_NONCE_LEN);
1004
1005 ptk_len = pairwise != WPA_CIPHER_CCMP ? 64 : 48;
1006 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
1007 sm->wpa_auth->addr, pmk_r1_name,
1008 (u8 *) &sm->PTK, ptk_len, ptk_name);
1009 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
1010 (u8 *) &sm->PTK, ptk_len);
1011 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
1012
1013 sm->pairwise = pairwise;
1014 wpa_ft_install_ptk(sm);
1015
1016 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
1017 2 + FT_R1KH_ID_LEN + 200;
1018 *resp_ies = os_zalloc(buflen);
1019 if (*resp_ies == NULL) {
1020 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1021 }
1022
1023 pos = *resp_ies;
1024 end = *resp_ies + buflen;
1025
1026 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
1027 if (ret < 0) {
1028 os_free(*resp_ies);
1029 *resp_ies = NULL;
1030 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1031 }
1032 pos += ret;
1033
1034 ret = wpa_write_mdie(conf, pos, end - pos);
1035 if (ret < 0) {
1036 os_free(*resp_ies);
1037 *resp_ies = NULL;
1038 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1039 }
1040 pos += ret;
1041
1042 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
1043 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
1044 if (ret < 0) {
1045 os_free(*resp_ies);
1046 *resp_ies = NULL;
1047 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1048 }
1049 pos += ret;
1050
1051 *resp_ies_len = pos - *resp_ies;
1052
1053 return WLAN_STATUS_SUCCESS;
1054 }
1055
1056
1057 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
1058 u16 auth_transaction, const u8 *ies, size_t ies_len,
1059 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
1060 u16 auth_transaction, u16 status,
1061 const u8 *ies, size_t ies_len),
1062 void *ctx)
1063 {
1064 u16 status;
1065 u8 *resp_ies;
1066 size_t resp_ies_len;
1067
1068 if (sm == NULL) {
1069 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
1070 "WPA SM not available");
1071 return;
1072 }
1073
1074 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
1075 " BSSID=" MACSTR " transaction=%d",
1076 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
1077 status = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
1078 &resp_ies_len);
1079
1080 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
1081 " auth_transaction=%d status=%d",
1082 MAC2STR(sm->addr), auth_transaction + 1, status);
1083 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1084 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
1085 resp_ies, resp_ies_len);
1086 os_free(resp_ies);
1087 }
1088
1089
1090 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
1091 size_t ies_len)
1092 {
1093 struct wpa_ft_ies parse;
1094 struct rsn_mdie *mdie;
1095 struct rsn_ftie *ftie;
1096 u8 mic[16];
1097 unsigned int count;
1098
1099 if (sm == NULL)
1100 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1101
1102 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
1103
1104 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
1105 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
1106 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1107 }
1108
1109 if (parse.rsn == NULL) {
1110 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
1111 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1112 }
1113
1114 if (parse.rsn_pmkid == NULL) {
1115 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
1116 return WLAN_STATUS_INVALID_PMKID;
1117 }
1118
1119 if (os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN) != 0)
1120 {
1121 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
1122 "with the PMKR1Name derived from auth request");
1123 return WLAN_STATUS_INVALID_PMKID;
1124 }
1125
1126 mdie = (struct rsn_mdie *) parse.mdie;
1127 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1128 os_memcmp(mdie->mobility_domain,
1129 sm->wpa_auth->conf.mobility_domain,
1130 MOBILITY_DOMAIN_ID_LEN) != 0) {
1131 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1132 return WLAN_STATUS_INVALID_MDIE;
1133 }
1134
1135 ftie = (struct rsn_ftie *) parse.ftie;
1136 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1137 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1138 return WLAN_STATUS_INVALID_FTIE;
1139 }
1140
1141 count = 3;
1142 if (parse.ric)
1143 count++;
1144 if (ftie->mic_control[1] != count) {
1145 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1146 "Control: received %u expected %u",
1147 ftie->mic_control[1], count);
1148 return -1;
1149 }
1150
1151 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5,
1152 parse.mdie - 2, parse.mdie_len + 2,
1153 parse.ftie - 2, parse.ftie_len + 2,
1154 parse.rsn - 2, parse.rsn_len + 2,
1155 parse.ric, parse.ric_len,
1156 mic) < 0) {
1157 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1158 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1159 }
1160
1161 if (os_memcmp(mic, ftie->mic, 16) != 0) {
1162 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1163 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
1164 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
1165 return WLAN_STATUS_INVALID_FTIE;
1166 }
1167
1168 return WLAN_STATUS_SUCCESS;
1169 }
1170
1171
1172 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1173 {
1174 const u8 *sta_addr, *target_ap;
1175 const u8 *ies;
1176 size_t ies_len;
1177 u8 action;
1178 struct ft_rrb_frame *frame;
1179
1180 if (sm == NULL)
1181 return -1;
1182
1183 /*
1184 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1185 * FT Request action frame body[variable]
1186 */
1187
1188 if (len < 14) {
1189 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1190 "(len=%lu)", (unsigned long) len);
1191 return -1;
1192 }
1193
1194 action = data[1];
1195 sta_addr = data + 2;
1196 target_ap = data + 8;
1197 ies = data + 14;
1198 ies_len = len - 14;
1199
1200 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1201 " Target AP=" MACSTR " Action=%d)",
1202 MAC2STR(sta_addr), MAC2STR(target_ap), action);
1203
1204 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1205 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1206 "STA=" MACSTR " STA-Address=" MACSTR,
1207 MAC2STR(sm->addr), MAC2STR(sta_addr));
1208 return -1;
1209 }
1210
1211 /*
1212 * Do some sanity checking on the target AP address (not own and not
1213 * broadcast. This could be extended to filter based on a list of known
1214 * APs in the MD (if such a list were configured).
1215 */
1216 if ((target_ap[0] & 0x01) ||
1217 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1218 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1219 "frame");
1220 return -1;
1221 }
1222
1223 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1224
1225 /* RRB - Forward action frame to the target AP */
1226 frame = os_malloc(sizeof(*frame) + len);
1227 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1228 frame->packet_type = FT_PACKET_REQUEST;
1229 frame->action_length = host_to_le16(len);
1230 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1231 os_memcpy(frame + 1, data, len);
1232
1233 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1234 sizeof(*frame) + len);
1235 os_free(frame);
1236
1237 return 0;
1238 }
1239
1240
1241 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1242 const u8 *current_ap, const u8 *sta_addr,
1243 const u8 *body, size_t len)
1244 {
1245 struct wpa_state_machine *sm;
1246 u16 status;
1247 u8 *resp_ies, *pos;
1248 size_t resp_ies_len, rlen;
1249 struct ft_rrb_frame *frame;
1250
1251 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1252 if (sm == NULL) {
1253 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1254 "RRB Request");
1255 return -1;
1256 }
1257
1258 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1259
1260 status = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1261 &resp_ies_len);
1262
1263 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1264 " CurrentAP=" MACSTR " status=%d",
1265 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1266 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1267
1268 /* RRB - Forward action frame response to the Current AP */
1269
1270 /*
1271 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1272 * Status_Code[2] FT Request action frame body[variable]
1273 */
1274 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1275
1276 frame = os_malloc(sizeof(*frame) + rlen);
1277 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1278 frame->packet_type = FT_PACKET_RESPONSE;
1279 frame->action_length = host_to_le16(rlen);
1280 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1281 pos = (u8 *) (frame + 1);
1282 *pos++ = WLAN_ACTION_FT;
1283 *pos++ = 2; /* Action: Response */
1284 os_memcpy(pos, sta_addr, ETH_ALEN);
1285 pos += ETH_ALEN;
1286 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1287 pos += ETH_ALEN;
1288 WPA_PUT_LE16(pos, status);
1289 pos += 2;
1290 if (resp_ies) {
1291 os_memcpy(pos, resp_ies, resp_ies_len);
1292 os_free(resp_ies);
1293 }
1294
1295 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1296 sizeof(*frame) + rlen);
1297 os_free(frame);
1298
1299 return 0;
1300 }
1301
1302
1303 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1304 const u8 *src_addr,
1305 const u8 *data, size_t data_len)
1306 {
1307 struct ft_r0kh_r1kh_pull_frame *frame, f;
1308 struct ft_remote_r1kh *r1kh;
1309 struct ft_r0kh_r1kh_resp_frame resp, r;
1310 u8 pmk_r0[PMK_LEN];
1311 int pairwise;
1312
1313 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1314
1315 if (data_len < sizeof(*frame))
1316 return -1;
1317
1318 r1kh = wpa_auth->conf.r1kh_list;
1319 while (r1kh) {
1320 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1321 break;
1322 r1kh = r1kh->next;
1323 }
1324 if (r1kh == NULL) {
1325 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1326 "PMK-R1 pull source address " MACSTR,
1327 MAC2STR(src_addr));
1328 return -1;
1329 }
1330
1331 frame = (struct ft_r0kh_r1kh_pull_frame *) data;
1332 /* aes_unwrap() does not support inplace decryption, so use a temporary
1333 * buffer for the data. */
1334 if (aes_unwrap(r1kh->key, (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1335 frame->nonce, f.nonce) < 0) {
1336 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1337 "request from " MACSTR, MAC2STR(src_addr));
1338 return -1;
1339 }
1340
1341 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1342 f.nonce, sizeof(f.nonce));
1343 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1344 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1345 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1346 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1347
1348 os_memset(&resp, 0, sizeof(resp));
1349 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1350 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1351 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1352 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1353
1354 /* aes_wrap() does not support inplace encryption, so use a temporary
1355 * buffer for the data. */
1356 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1357 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1358 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1359 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1360 &pairwise) < 0) {
1361 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1362 "PMK-R1 pull");
1363 return -1;
1364 }
1365
1366 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1367 r.pmk_r1, r.pmk_r1_name);
1368 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1369 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1370 WPA_PMK_NAME_LEN);
1371 r.pairwise = pairwise;
1372
1373 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1374 r.nonce, resp.nonce) < 0) {
1375 os_memset(pmk_r0, 0, PMK_LEN);
1376 return -1;
1377 }
1378
1379 os_memset(pmk_r0, 0, PMK_LEN);
1380
1381 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1382
1383 return 0;
1384 }
1385
1386
1387 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1388 const u8 *src_addr,
1389 const u8 *data, size_t data_len)
1390 {
1391 struct ft_r0kh_r1kh_resp_frame *frame, f;
1392 struct ft_remote_r0kh *r0kh;
1393 int pairwise;
1394
1395 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1396
1397 if (data_len < sizeof(*frame))
1398 return -1;
1399
1400 r0kh = wpa_auth->conf.r0kh_list;
1401 while (r0kh) {
1402 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1403 break;
1404 r0kh = r0kh->next;
1405 }
1406 if (r0kh == NULL) {
1407 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1408 "PMK-R0 pull response source address " MACSTR,
1409 MAC2STR(src_addr));
1410 return -1;
1411 }
1412
1413 frame = (struct ft_r0kh_r1kh_resp_frame *) data;
1414 /* aes_unwrap() does not support inplace decryption, so use a temporary
1415 * buffer for the data. */
1416 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1417 frame->nonce, f.nonce) < 0) {
1418 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1419 "response from " MACSTR, MAC2STR(src_addr));
1420 return -1;
1421 }
1422
1423 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1424 != 0) {
1425 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1426 "matching R1KH-ID");
1427 return -1;
1428 }
1429
1430 /* TODO: verify that <nonce,s1kh_id> matches with a pending request
1431 * and call this requests callback function to finish request
1432 * processing */
1433
1434 pairwise = le_to_host16(f.pairwise);
1435 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1436 f.nonce, sizeof(f.nonce));
1437 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
1438 MACSTR " pairwise=0x%x",
1439 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1440 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1441 f.pmk_r1, PMK_LEN);
1442 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1443 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1444
1445 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1446 pairwise);
1447 os_memset(f.pmk_r1, 0, PMK_LEN);
1448
1449 return 0;
1450 }
1451
1452
1453 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1454 const u8 *src_addr,
1455 const u8 *data, size_t data_len)
1456 {
1457 struct ft_r0kh_r1kh_push_frame *frame, f;
1458 struct ft_remote_r0kh *r0kh;
1459 struct os_time now;
1460 os_time_t tsend;
1461 int pairwise;
1462
1463 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1464
1465 if (data_len < sizeof(*frame))
1466 return -1;
1467
1468 r0kh = wpa_auth->conf.r0kh_list;
1469 while (r0kh) {
1470 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1471 break;
1472 r0kh = r0kh->next;
1473 }
1474 if (r0kh == NULL) {
1475 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1476 "PMK-R0 push source address " MACSTR,
1477 MAC2STR(src_addr));
1478 return -1;
1479 }
1480
1481 frame = (struct ft_r0kh_r1kh_push_frame *) data;
1482 /* aes_unwrap() does not support inplace decryption, so use a temporary
1483 * buffer for the data. */
1484 if (aes_unwrap(r0kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1485 frame->timestamp, f.timestamp) < 0) {
1486 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1487 MACSTR, MAC2STR(src_addr));
1488 return -1;
1489 }
1490
1491 os_get_time(&now);
1492 tsend = WPA_GET_LE32(f.timestamp);
1493 if ((now.sec > tsend && now.sec - tsend > 60) ||
1494 (now.sec < tsend && tsend - now.sec > 60)) {
1495 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1496 "timestamp: sender time %d own time %d\n",
1497 (int) tsend, (int) now.sec);
1498 return -1;
1499 }
1500
1501 if (os_memcmp(f.r1kh_id, wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN)
1502 != 0) {
1503 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1504 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1505 MAC2STR(f.r1kh_id),
1506 MAC2STR(wpa_auth->conf.r1_key_holder));
1507 return -1;
1508 }
1509
1510 pairwise = le_to_host16(f.pairwise);
1511 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1512 MACSTR " pairwise=0x%x",
1513 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1514 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1515 f.pmk_r1, PMK_LEN);
1516 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1517 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1518
1519 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1520 pairwise);
1521 os_memset(f.pmk_r1, 0, PMK_LEN);
1522
1523 return 0;
1524 }
1525
1526
1527 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1528 const u8 *data, size_t data_len)
1529 {
1530 struct ft_rrb_frame *frame;
1531 u16 alen;
1532 const u8 *pos, *end, *start;
1533 u8 action;
1534 const u8 *sta_addr, *target_ap_addr;
1535
1536 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1537 MAC2STR(src_addr));
1538
1539 if (data_len < sizeof(*frame)) {
1540 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1541 (unsigned long) data_len);
1542 return -1;
1543 }
1544
1545 pos = data;
1546 frame = (struct ft_rrb_frame *) pos;
1547 pos += sizeof(*frame);
1548
1549 alen = le_to_host16(frame->action_length);
1550 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1551 "action_length=%d ap_address=" MACSTR,
1552 frame->frame_type, frame->packet_type, alen,
1553 MAC2STR(frame->ap_address));
1554
1555 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1556 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1557 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1558 "unrecognized type %d", frame->frame_type);
1559 return -1;
1560 }
1561
1562 if (alen > data_len - sizeof(*frame)) {
1563 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1564 "frame");
1565 return -1;
1566 }
1567
1568 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1569 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1570 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1571 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1572 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1573 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1574
1575 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1576
1577 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1578 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1579 "room for Action Frame body); alen=%lu",
1580 (unsigned long) alen);
1581 return -1;
1582 }
1583 start = pos;
1584 end = pos + alen;
1585
1586 if (*pos != WLAN_ACTION_FT) {
1587 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1588 "%d", *pos);
1589 return -1;
1590 }
1591
1592 pos++;
1593 action = *pos++;
1594 sta_addr = pos;
1595 pos += ETH_ALEN;
1596 target_ap_addr = pos;
1597 pos += ETH_ALEN;
1598 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1599 MACSTR " target_ap_addr=" MACSTR,
1600 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1601
1602 if (frame->packet_type == FT_PACKET_REQUEST) {
1603 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1604
1605 if (action != 1) {
1606 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1607 "RRB Request", action);
1608 return -1;
1609 }
1610
1611 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1612 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1613 "RRB Request does not match with own "
1614 "address");
1615 return -1;
1616 }
1617
1618 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1619 sta_addr, pos, end - pos) < 0)
1620 return -1;
1621 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1622 u16 status_code;
1623
1624 if (end - pos < 2) {
1625 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1626 "code in RRB Response");
1627 return -1;
1628 }
1629 status_code = WPA_GET_LE16(pos);
1630 pos += 2;
1631
1632 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1633 "(status_code=%d)", status_code);
1634
1635 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1636 return -1;
1637 } else {
1638 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1639 "packet_type %d", frame->packet_type);
1640 return -1;
1641 }
1642
1643 return 0;
1644 }
1645
1646
1647 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1648 struct wpa_ft_pmk_r0_sa *pmk_r0,
1649 struct ft_remote_r1kh *r1kh,
1650 const u8 *s1kh_id, int pairwise)
1651 {
1652 struct ft_r0kh_r1kh_push_frame frame, f;
1653 struct os_time now;
1654
1655 os_memset(&frame, 0, sizeof(frame));
1656 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1657 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1658 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1659 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1660
1661 /* aes_wrap() does not support inplace encryption, so use a temporary
1662 * buffer for the data. */
1663 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1664 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1665 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1666 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1667 s1kh_id, f.pmk_r1, f.pmk_r1_name);
1668 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1669 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1670 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1671 WPA_PMK_NAME_LEN);
1672 os_get_time(&now);
1673 WPA_PUT_LE32(f.timestamp, now.sec);
1674 f.pairwise = pairwise;
1675 if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1676 f.timestamp, frame.timestamp) < 0)
1677 return;
1678
1679 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1680 }
1681
1682
1683 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1684 {
1685 struct wpa_ft_pmk_r0_sa *r0;
1686 struct ft_remote_r1kh *r1kh;
1687
1688 if (!wpa_auth->conf.pmk_r1_push)
1689 return;
1690
1691 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1692 while (r0) {
1693 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1694 break;
1695 r0 = r0->next;
1696 }
1697
1698 if (r0 == NULL || r0->pmk_r1_pushed)
1699 return;
1700 r0->pmk_r1_pushed = 1;
1701
1702 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1703 "for STA " MACSTR, MAC2STR(addr));
1704
1705 r1kh = wpa_auth->conf.r1kh_list;
1706 while (r1kh) {
1707 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1708 r1kh = r1kh->next;
1709 }
1710 }
1711
1712 #endif /* CONFIG_IEEE80211R */
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