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