1 /*
2 * hostapd - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2004-2014, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "common/ieee802_11_defs.h"
14 #include "common/ieee802_11_common.h"
15 #include "crypto/aes_wrap.h"
16 #include "crypto/random.h"
17 #include "ap_config.h"
18 #include "ieee802_11.h"
19 #include "wmm.h"
20 #include "wpa_auth.h"
21 #include "wpa_auth_i.h"
22
23
24 #ifdef CONFIG_IEEE80211R
25
26 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
27 const u8 *current_ap, const u8 *sta_addr,
28 u16 status, const u8 *resp_ies,
29 size_t resp_ies_len);
30
31
wpa_ft_rrb_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)32 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
33 const u8 *data, size_t data_len)
34 {
35 if (wpa_auth->cb.send_ether == NULL)
36 return -1;
37 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
38 return wpa_auth->cb.send_ether(wpa_auth->cb.ctx, dst, ETH_P_RRB,
39 data, data_len);
40 }
41
42
wpa_ft_action_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)43 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
44 const u8 *dst, const u8 *data, size_t data_len)
45 {
46 if (wpa_auth->cb.send_ft_action == NULL)
47 return -1;
48 return wpa_auth->cb.send_ft_action(wpa_auth->cb.ctx, dst,
49 data, data_len);
50 }
51
52
53 static struct wpa_state_machine *
wpa_ft_add_sta(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)54 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
55 {
56 if (wpa_auth->cb.add_sta == NULL)
57 return NULL;
58 return wpa_auth->cb.add_sta(wpa_auth->cb.ctx, sta_addr);
59 }
60
61
wpa_ft_add_tspec(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,u8 * tspec_ie,size_t tspec_ielen)62 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
63 const u8 *sta_addr,
64 u8 *tspec_ie, size_t tspec_ielen)
65 {
66 if (wpa_auth->cb.add_tspec == NULL) {
67 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
68 return -1;
69 }
70 return wpa_auth->cb.add_tspec(wpa_auth->cb.ctx, sta_addr, tspec_ie,
71 tspec_ielen);
72 }
73
74
wpa_write_mdie(struct wpa_auth_config * conf,u8 * buf,size_t len)75 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
76 {
77 u8 *pos = buf;
78 u8 capab;
79 if (len < 2 + sizeof(struct rsn_mdie))
80 return -1;
81
82 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
83 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
84 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
85 pos += MOBILITY_DOMAIN_ID_LEN;
86 capab = 0;
87 if (conf->ft_over_ds)
88 capab |= RSN_FT_CAPAB_FT_OVER_DS;
89 *pos++ = capab;
90
91 return pos - buf;
92 }
93
94
wpa_write_ftie(struct wpa_auth_config * conf,const u8 * r0kh_id,size_t r0kh_id_len,const u8 * anonce,const u8 * snonce,u8 * buf,size_t len,const u8 * subelem,size_t subelem_len)95 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
96 size_t r0kh_id_len,
97 const u8 *anonce, const u8 *snonce,
98 u8 *buf, size_t len, const u8 *subelem,
99 size_t subelem_len)
100 {
101 u8 *pos = buf, *ielen;
102 struct rsn_ftie *hdr;
103
104 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
105 subelem_len)
106 return -1;
107
108 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
109 ielen = pos++;
110
111 hdr = (struct rsn_ftie *) pos;
112 os_memset(hdr, 0, sizeof(*hdr));
113 pos += sizeof(*hdr);
114 WPA_PUT_LE16(hdr->mic_control, 0);
115 if (anonce)
116 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
117 if (snonce)
118 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
119
120 /* Optional Parameters */
121 *pos++ = FTIE_SUBELEM_R1KH_ID;
122 *pos++ = FT_R1KH_ID_LEN;
123 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
124 pos += FT_R1KH_ID_LEN;
125
126 if (r0kh_id) {
127 *pos++ = FTIE_SUBELEM_R0KH_ID;
128 *pos++ = r0kh_id_len;
129 os_memcpy(pos, r0kh_id, r0kh_id_len);
130 pos += r0kh_id_len;
131 }
132
133 if (subelem) {
134 os_memcpy(pos, subelem, subelem_len);
135 pos += subelem_len;
136 }
137
138 *ielen = pos - buf - 2;
139
140 return pos - buf;
141 }
142
143
144 struct wpa_ft_pmk_r0_sa {
145 struct wpa_ft_pmk_r0_sa *next;
146 u8 pmk_r0[PMK_LEN];
147 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
148 u8 spa[ETH_ALEN];
149 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
150 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
151 int pmk_r1_pushed;
152 };
153
154 struct wpa_ft_pmk_r1_sa {
155 struct wpa_ft_pmk_r1_sa *next;
156 u8 pmk_r1[PMK_LEN];
157 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
158 u8 spa[ETH_ALEN];
159 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
160 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
161 };
162
163 struct wpa_ft_pmk_cache {
164 struct wpa_ft_pmk_r0_sa *pmk_r0;
165 struct wpa_ft_pmk_r1_sa *pmk_r1;
166 };
167
wpa_ft_pmk_cache_init(void)168 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
169 {
170 struct wpa_ft_pmk_cache *cache;
171
172 cache = os_zalloc(sizeof(*cache));
173
174 return cache;
175 }
176
177
wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache * cache)178 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
179 {
180 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
181 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
182
183 r0 = cache->pmk_r0;
184 while (r0) {
185 r0prev = r0;
186 r0 = r0->next;
187 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
188 os_free(r0prev);
189 }
190
191 r1 = cache->pmk_r1;
192 while (r1) {
193 r1prev = r1;
194 r1 = r1->next;
195 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
196 os_free(r1prev);
197 }
198
199 os_free(cache);
200 }
201
202
wpa_ft_store_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0,const u8 * pmk_r0_name,int pairwise)203 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
204 const u8 *spa, const u8 *pmk_r0,
205 const u8 *pmk_r0_name, int pairwise)
206 {
207 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
208 struct wpa_ft_pmk_r0_sa *r0;
209
210 /* TODO: add expiration and limit on number of entries in cache */
211
212 r0 = os_zalloc(sizeof(*r0));
213 if (r0 == NULL)
214 return -1;
215
216 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
217 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
218 os_memcpy(r0->spa, spa, ETH_ALEN);
219 r0->pairwise = pairwise;
220
221 r0->next = cache->pmk_r0;
222 cache->pmk_r0 = r0;
223
224 return 0;
225 }
226
227
wpa_ft_fetch_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0_name,u8 * pmk_r0,int * pairwise)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, int *pairwise)
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_const(r0->pmk_r0_name, pmk_r0_name,
239 WPA_PMK_NAME_LEN) == 0) {
240 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
241 if (pairwise)
242 *pairwise = r0->pairwise;
243 return 0;
244 }
245
246 r0 = r0->next;
247 }
248
249 return -1;
250 }
251
252
wpa_ft_store_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1,const u8 * pmk_r1_name,int pairwise)253 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
254 const u8 *spa, const u8 *pmk_r1,
255 const u8 *pmk_r1_name, int pairwise)
256 {
257 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
258 struct wpa_ft_pmk_r1_sa *r1;
259
260 /* TODO: add expiration and limit on number of entries in cache */
261
262 r1 = os_zalloc(sizeof(*r1));
263 if (r1 == NULL)
264 return -1;
265
266 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
267 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
268 os_memcpy(r1->spa, spa, ETH_ALEN);
269 r1->pairwise = pairwise;
270
271 r1->next = cache->pmk_r1;
272 cache->pmk_r1 = r1;
273
274 return 0;
275 }
276
277
wpa_ft_fetch_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1_name,u8 * pmk_r1,int * pairwise)278 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
279 const u8 *spa, const u8 *pmk_r1_name,
280 u8 *pmk_r1, int *pairwise)
281 {
282 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
283 struct wpa_ft_pmk_r1_sa *r1;
284
285 r1 = cache->pmk_r1;
286 while (r1) {
287 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
288 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
289 WPA_PMK_NAME_LEN) == 0) {
290 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
291 if (pairwise)
292 *pairwise = r1->pairwise;
293 return 0;
294 }
295
296 r1 = r1->next;
297 }
298
299 return -1;
300 }
301
302
wpa_ft_pull_pmk_r1(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len,const u8 * pmk_r0_name)303 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
304 const u8 *ies, size_t ies_len,
305 const u8 *pmk_r0_name)
306 {
307 struct ft_remote_r0kh *r0kh;
308 struct ft_r0kh_r1kh_pull_frame frame, f;
309
310 r0kh = sm->wpa_auth->conf.r0kh_list;
311 while (r0kh) {
312 if (r0kh->id_len == sm->r0kh_id_len &&
313 os_memcmp_const(r0kh->id, sm->r0kh_id, sm->r0kh_id_len) ==
314 0)
315 break;
316 r0kh = r0kh->next;
317 }
318 if (r0kh == NULL) {
319 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
320 sm->r0kh_id, sm->r0kh_id_len);
321 return -1;
322 }
323
324 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
325 "address " MACSTR, MAC2STR(r0kh->addr));
326
327 os_memset(&frame, 0, sizeof(frame));
328 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
329 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
330 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
331 os_memcpy(frame.ap_address, sm->wpa_auth->addr, ETH_ALEN);
332
333 /* aes_wrap() does not support inplace encryption, so use a temporary
334 * buffer for the data. */
335 if (random_get_bytes(f.nonce, FT_R0KH_R1KH_PULL_NONCE_LEN)) {
336 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
337 "nonce");
338 return -1;
339 }
340 os_memcpy(sm->ft_pending_pull_nonce, f.nonce,
341 FT_R0KH_R1KH_PULL_NONCE_LEN);
342 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
343 os_memcpy(f.r1kh_id, sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
344 os_memcpy(f.s1kh_id, sm->addr, ETH_ALEN);
345 os_memset(f.pad, 0, sizeof(f.pad));
346
347 if (aes_wrap(r0kh->key, sizeof(r0kh->key),
348 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
349 f.nonce, frame.nonce) < 0)
350 return -1;
351
352 wpabuf_free(sm->ft_pending_req_ies);
353 sm->ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
354 if (sm->ft_pending_req_ies == NULL)
355 return -1;
356
357 wpa_ft_rrb_send(sm->wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
358
359 return 0;
360 }
361
362
wpa_auth_derive_ptk_ft(struct wpa_state_machine * sm,const u8 * pmk,struct wpa_ptk * ptk,size_t ptk_len)363 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
364 struct wpa_ptk *ptk, size_t ptk_len)
365 {
366 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
367 u8 pmk_r1[PMK_LEN];
368 u8 ptk_name[WPA_PMK_NAME_LEN];
369 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
370 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
371 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
372 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
373 const u8 *ssid = sm->wpa_auth->conf.ssid;
374 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
375
376
377 if (sm->xxkey_len == 0) {
378 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
379 "derivation");
380 return -1;
381 }
382
383 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
384 r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
385 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
386 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
387 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
388 sm->pairwise);
389
390 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
391 pmk_r1, sm->pmk_r1_name);
392 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
393 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
394 WPA_PMK_NAME_LEN);
395 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, sm->pmk_r1_name,
396 sm->pairwise);
397
398 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
399 sm->wpa_auth->addr, sm->pmk_r1_name,
400 (u8 *) ptk, ptk_len, ptk_name);
401 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
402 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
403
404 return 0;
405 }
406
407
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)408 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
409 const u8 *addr, int idx, u8 *seq)
410 {
411 if (wpa_auth->cb.get_seqnum == NULL)
412 return -1;
413 return wpa_auth->cb.get_seqnum(wpa_auth->cb.ctx, addr, idx, seq);
414 }
415
416
wpa_ft_gtk_subelem(struct wpa_state_machine * sm,size_t * len)417 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
418 {
419 u8 *subelem;
420 struct wpa_group *gsm = sm->group;
421 size_t subelem_len, pad_len;
422 const u8 *key;
423 size_t key_len;
424 u8 keybuf[32];
425
426 key_len = gsm->GTK_len;
427 if (key_len > sizeof(keybuf))
428 return NULL;
429
430 /*
431 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
432 * than 16 bytes.
433 */
434 pad_len = key_len % 8;
435 if (pad_len)
436 pad_len = 8 - pad_len;
437 if (key_len + pad_len < 16)
438 pad_len += 8;
439 if (pad_len && key_len < sizeof(keybuf)) {
440 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
441 os_memset(keybuf + key_len, 0, pad_len);
442 keybuf[key_len] = 0xdd;
443 key_len += pad_len;
444 key = keybuf;
445 } else
446 key = gsm->GTK[gsm->GN - 1];
447
448 /*
449 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
450 * Key[5..32].
451 */
452 subelem_len = 13 + key_len + 8;
453 subelem = os_zalloc(subelem_len);
454 if (subelem == NULL)
455 return NULL;
456
457 subelem[0] = FTIE_SUBELEM_GTK;
458 subelem[1] = 11 + key_len + 8;
459 /* Key ID in B0-B1 of Key Info */
460 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
461 subelem[4] = gsm->GTK_len;
462 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
463 if (aes_wrap(sm->PTK.kek, 16, key_len / 8, key, subelem + 13)) {
464 os_free(subelem);
465 return NULL;
466 }
467
468 *len = subelem_len;
469 return subelem;
470 }
471
472
473 #ifdef CONFIG_IEEE80211W
wpa_ft_igtk_subelem(struct wpa_state_machine * sm,size_t * len)474 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
475 {
476 u8 *subelem, *pos;
477 struct wpa_group *gsm = sm->group;
478 size_t subelem_len;
479
480 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
481 * Key[16+8] */
482 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
483 subelem = os_zalloc(subelem_len);
484 if (subelem == NULL)
485 return NULL;
486
487 pos = subelem;
488 *pos++ = FTIE_SUBELEM_IGTK;
489 *pos++ = subelem_len - 2;
490 WPA_PUT_LE16(pos, gsm->GN_igtk);
491 pos += 2;
492 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
493 pos += 6;
494 *pos++ = WPA_IGTK_LEN;
495 if (aes_wrap(sm->PTK.kek, 16, WPA_IGTK_LEN / 8,
496 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
497 os_free(subelem);
498 return NULL;
499 }
500
501 *len = subelem_len;
502 return subelem;
503 }
504 #endif /* CONFIG_IEEE80211W */
505
506
wpa_ft_process_rdie(struct wpa_state_machine * sm,u8 * pos,u8 * end,u8 id,u8 descr_count,const u8 * ies,size_t ies_len)507 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
508 u8 *pos, u8 *end, u8 id, u8 descr_count,
509 const u8 *ies, size_t ies_len)
510 {
511 struct ieee802_11_elems parse;
512 struct rsn_rdie *rdie;
513
514 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
515 id, descr_count);
516 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
517 ies, ies_len);
518
519 if (end - pos < (int) sizeof(*rdie)) {
520 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
521 return pos;
522 }
523
524 *pos++ = WLAN_EID_RIC_DATA;
525 *pos++ = sizeof(*rdie);
526 rdie = (struct rsn_rdie *) pos;
527 rdie->id = id;
528 rdie->descr_count = 0;
529 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
530 pos += sizeof(*rdie);
531
532 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
533 ParseFailed) {
534 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
535 rdie->status_code =
536 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
537 return pos;
538 }
539
540 #ifdef NEED_AP_MLME
541 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
542 struct wmm_tspec_element *tspec;
543 int res;
544
545 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
546 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
547 "(%d)", (int) parse.wmm_tspec_len);
548 rdie->status_code =
549 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
550 return pos;
551 }
552 if (end - pos < (int) sizeof(*tspec)) {
553 wpa_printf(MSG_ERROR, "FT: Not enough room for "
554 "response TSPEC");
555 rdie->status_code =
556 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
557 return pos;
558 }
559 tspec = (struct wmm_tspec_element *) pos;
560 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
561 res = wmm_process_tspec(tspec);
562 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
563 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
564 rdie->status_code =
565 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
566 else if (res == WMM_ADDTS_STATUS_REFUSED)
567 rdie->status_code =
568 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
569 else {
570 /* TSPEC accepted; include updated TSPEC in response */
571 rdie->descr_count = 1;
572 pos += sizeof(*tspec);
573 }
574 return pos;
575 }
576 #endif /* NEED_AP_MLME */
577
578 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
579 struct wmm_tspec_element *tspec;
580 int res;
581
582 tspec = (struct wmm_tspec_element *) pos;
583 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
584 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
585 sizeof(*tspec));
586 if (res >= 0) {
587 if (res)
588 rdie->status_code = host_to_le16(res);
589 else {
590 /* TSPEC accepted; include updated TSPEC in
591 * response */
592 rdie->descr_count = 1;
593 pos += sizeof(*tspec);
594 }
595 return pos;
596 }
597 }
598
599 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
600 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
601 return pos;
602 }
603
604
wpa_ft_process_ric(struct wpa_state_machine * sm,u8 * pos,u8 * end,const u8 * ric,size_t ric_len)605 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
606 const u8 *ric, size_t ric_len)
607 {
608 const u8 *rpos, *start;
609 const struct rsn_rdie *rdie;
610
611 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
612
613 rpos = ric;
614 while (rpos + sizeof(*rdie) < ric + ric_len) {
615 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
616 rpos + 2 + rpos[1] > ric + ric_len)
617 break;
618 rdie = (const struct rsn_rdie *) (rpos + 2);
619 rpos += 2 + rpos[1];
620 start = rpos;
621
622 while (rpos + 2 <= ric + ric_len &&
623 rpos + 2 + rpos[1] <= ric + ric_len) {
624 if (rpos[0] == WLAN_EID_RIC_DATA)
625 break;
626 rpos += 2 + rpos[1];
627 }
628 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
629 rdie->descr_count,
630 start, rpos - start);
631 }
632
633 return pos;
634 }
635
636
wpa_sm_write_assoc_resp_ies(struct wpa_state_machine * sm,u8 * pos,size_t max_len,int auth_alg,const u8 * req_ies,size_t req_ies_len)637 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
638 size_t max_len, int auth_alg,
639 const u8 *req_ies, size_t req_ies_len)
640 {
641 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
642 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
643 int res;
644 struct wpa_auth_config *conf;
645 struct rsn_ftie *_ftie;
646 struct wpa_ft_ies parse;
647 u8 *ric_start;
648 u8 *anonce, *snonce;
649
650 if (sm == NULL)
651 return pos;
652
653 conf = &sm->wpa_auth->conf;
654
655 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
656 return pos;
657
658 end = pos + max_len;
659
660 if (auth_alg == WLAN_AUTH_FT) {
661 /*
662 * RSN (only present if this is a Reassociation Response and
663 * part of a fast BSS transition)
664 */
665 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
666 if (res < 0)
667 return pos;
668 rsnie = pos;
669 rsnie_len = res;
670 pos += res;
671 }
672
673 /* Mobility Domain Information */
674 res = wpa_write_mdie(conf, pos, end - pos);
675 if (res < 0)
676 return pos;
677 mdie = pos;
678 mdie_len = res;
679 pos += res;
680
681 /* Fast BSS Transition Information */
682 if (auth_alg == WLAN_AUTH_FT) {
683 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
684 r0kh_id = sm->r0kh_id;
685 r0kh_id_len = sm->r0kh_id_len;
686 anonce = sm->ANonce;
687 snonce = sm->SNonce;
688 #ifdef CONFIG_IEEE80211W
689 if (sm->mgmt_frame_prot) {
690 u8 *igtk;
691 size_t igtk_len;
692 u8 *nbuf;
693 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
694 if (igtk == NULL) {
695 os_free(subelem);
696 return pos;
697 }
698 nbuf = os_realloc(subelem, subelem_len + igtk_len);
699 if (nbuf == NULL) {
700 os_free(subelem);
701 os_free(igtk);
702 return pos;
703 }
704 subelem = nbuf;
705 os_memcpy(subelem + subelem_len, igtk, igtk_len);
706 subelem_len += igtk_len;
707 os_free(igtk);
708 }
709 #endif /* CONFIG_IEEE80211W */
710 } else {
711 r0kh_id = conf->r0_key_holder;
712 r0kh_id_len = conf->r0_key_holder_len;
713 anonce = NULL;
714 snonce = NULL;
715 }
716 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
717 end - pos, subelem, subelem_len);
718 os_free(subelem);
719 if (res < 0)
720 return pos;
721 ftie = pos;
722 ftie_len = res;
723 pos += res;
724
725 os_free(sm->assoc_resp_ftie);
726 sm->assoc_resp_ftie = os_malloc(ftie_len);
727 if (sm->assoc_resp_ftie)
728 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
729
730 _ftie = (struct rsn_ftie *) (ftie + 2);
731 if (auth_alg == WLAN_AUTH_FT)
732 _ftie->mic_control[1] = 3; /* Information element count */
733
734 ric_start = pos;
735 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
736 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
737 parse.ric_len);
738 if (auth_alg == WLAN_AUTH_FT)
739 _ftie->mic_control[1] +=
740 ieee802_11_ie_count(ric_start,
741 pos - ric_start);
742 }
743 if (ric_start == pos)
744 ric_start = NULL;
745
746 if (auth_alg == WLAN_AUTH_FT &&
747 wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 6,
748 mdie, mdie_len, ftie, ftie_len,
749 rsnie, rsnie_len,
750 ric_start, ric_start ? pos - ric_start : 0,
751 _ftie->mic) < 0)
752 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
753
754 return pos;
755 }
756
757
wpa_auth_set_key(struct wpa_authenticator * wpa_auth,int vlan_id,enum wpa_alg alg,const u8 * addr,int idx,u8 * key,size_t key_len)758 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
759 int vlan_id,
760 enum wpa_alg alg, const u8 *addr, int idx,
761 u8 *key, size_t key_len)
762 {
763 if (wpa_auth->cb.set_key == NULL)
764 return -1;
765 return wpa_auth->cb.set_key(wpa_auth->cb.ctx, vlan_id, alg, addr, idx,
766 key, key_len);
767 }
768
769
wpa_ft_install_ptk(struct wpa_state_machine * sm)770 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
771 {
772 enum wpa_alg alg;
773 int klen;
774
775 /* MLME-SETKEYS.request(PTK) */
776 alg = wpa_cipher_to_alg(sm->pairwise);
777 klen = wpa_cipher_key_len(sm->pairwise);
778 if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
779 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
780 "PTK configuration", sm->pairwise);
781 return;
782 }
783
784 /* FIX: add STA entry to kernel/driver here? The set_key will fail
785 * most likely without this.. At the moment, STA entry is added only
786 * after association has been completed. This function will be called
787 * again after association to get the PTK configured, but that could be
788 * optimized by adding the STA entry earlier.
789 */
790 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
791 sm->PTK.tk1, klen))
792 return;
793
794 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
795 sm->pairwise_set = TRUE;
796 }
797
798
wpa_ft_process_auth_req(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len,u8 ** resp_ies,size_t * resp_ies_len)799 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
800 const u8 *ies, size_t ies_len,
801 u8 **resp_ies, size_t *resp_ies_len)
802 {
803 struct rsn_mdie *mdie;
804 struct rsn_ftie *ftie;
805 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
806 u8 ptk_name[WPA_PMK_NAME_LEN];
807 struct wpa_auth_config *conf;
808 struct wpa_ft_ies parse;
809 size_t buflen, ptk_len;
810 int ret;
811 u8 *pos, *end;
812 int pairwise;
813
814 *resp_ies = NULL;
815 *resp_ies_len = 0;
816
817 sm->pmk_r1_name_valid = 0;
818 conf = &sm->wpa_auth->conf;
819
820 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
821 ies, ies_len);
822
823 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
824 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
825 return WLAN_STATUS_UNSPECIFIED_FAILURE;
826 }
827
828 mdie = (struct rsn_mdie *) parse.mdie;
829 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
830 os_memcmp(mdie->mobility_domain,
831 sm->wpa_auth->conf.mobility_domain,
832 MOBILITY_DOMAIN_ID_LEN) != 0) {
833 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
834 return WLAN_STATUS_INVALID_MDIE;
835 }
836
837 ftie = (struct rsn_ftie *) parse.ftie;
838 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
839 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
840 return WLAN_STATUS_INVALID_FTIE;
841 }
842
843 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
844
845 if (parse.r0kh_id == NULL) {
846 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
847 return WLAN_STATUS_INVALID_FTIE;
848 }
849
850 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
851 parse.r0kh_id, parse.r0kh_id_len);
852 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
853 sm->r0kh_id_len = parse.r0kh_id_len;
854
855 if (parse.rsn_pmkid == NULL) {
856 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
857 return WLAN_STATUS_INVALID_PMKID;
858 }
859
860 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
861 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
862 wpa_derive_pmk_r1_name(parse.rsn_pmkid,
863 sm->wpa_auth->conf.r1_key_holder, sm->addr,
864 pmk_r1_name);
865 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
866 pmk_r1_name, WPA_PMK_NAME_LEN);
867
868 if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1,
869 &pairwise) < 0) {
870 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
871 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
872 "PMK-R1 and unknown R0KH-ID");
873 return WLAN_STATUS_INVALID_PMKID;
874 }
875
876 return -1; /* Status pending */
877 }
878
879 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
880 sm->pmk_r1_name_valid = 1;
881 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
882
883 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
884 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
885 "ANonce");
886 return WLAN_STATUS_UNSPECIFIED_FAILURE;
887 }
888
889 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
890 sm->SNonce, WPA_NONCE_LEN);
891 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
892 sm->ANonce, WPA_NONCE_LEN);
893
894 ptk_len = pairwise == WPA_CIPHER_TKIP ? 64 : 48;
895 wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
896 sm->wpa_auth->addr, pmk_r1_name,
897 (u8 *) &sm->PTK, ptk_len, ptk_name);
898 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
899 (u8 *) &sm->PTK, ptk_len);
900 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
901
902 sm->pairwise = pairwise;
903 sm->PTK_valid = TRUE;
904 wpa_ft_install_ptk(sm);
905
906 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
907 2 + FT_R1KH_ID_LEN + 200;
908 *resp_ies = os_zalloc(buflen);
909 if (*resp_ies == NULL) {
910 return WLAN_STATUS_UNSPECIFIED_FAILURE;
911 }
912
913 pos = *resp_ies;
914 end = *resp_ies + buflen;
915
916 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
917 if (ret < 0) {
918 os_free(*resp_ies);
919 *resp_ies = NULL;
920 return WLAN_STATUS_UNSPECIFIED_FAILURE;
921 }
922 pos += ret;
923
924 ret = wpa_write_mdie(conf, pos, end - pos);
925 if (ret < 0) {
926 os_free(*resp_ies);
927 *resp_ies = NULL;
928 return WLAN_STATUS_UNSPECIFIED_FAILURE;
929 }
930 pos += ret;
931
932 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
933 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
934 if (ret < 0) {
935 os_free(*resp_ies);
936 *resp_ies = NULL;
937 return WLAN_STATUS_UNSPECIFIED_FAILURE;
938 }
939 pos += ret;
940
941 *resp_ies_len = pos - *resp_ies;
942
943 return WLAN_STATUS_SUCCESS;
944 }
945
946
wpa_ft_process_auth(struct wpa_state_machine * sm,const u8 * bssid,u16 auth_transaction,const u8 * ies,size_t ies_len,void (* cb)(void * ctx,const u8 * dst,const u8 * bssid,u16 auth_transaction,u16 status,const u8 * ies,size_t ies_len),void * ctx)947 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
948 u16 auth_transaction, const u8 *ies, size_t ies_len,
949 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
950 u16 auth_transaction, u16 status,
951 const u8 *ies, size_t ies_len),
952 void *ctx)
953 {
954 u16 status;
955 u8 *resp_ies;
956 size_t resp_ies_len;
957 int res;
958
959 if (sm == NULL) {
960 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
961 "WPA SM not available");
962 return;
963 }
964
965 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
966 " BSSID=" MACSTR " transaction=%d",
967 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
968 sm->ft_pending_cb = cb;
969 sm->ft_pending_cb_ctx = ctx;
970 sm->ft_pending_auth_transaction = auth_transaction;
971 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
972 &resp_ies_len);
973 if (res < 0) {
974 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
975 return;
976 }
977 status = res;
978
979 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
980 " auth_transaction=%d status=%d",
981 MAC2STR(sm->addr), auth_transaction + 1, status);
982 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
983 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
984 resp_ies, resp_ies_len);
985 os_free(resp_ies);
986 }
987
988
wpa_ft_validate_reassoc(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)989 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
990 size_t ies_len)
991 {
992 struct wpa_ft_ies parse;
993 struct rsn_mdie *mdie;
994 struct rsn_ftie *ftie;
995 u8 mic[16];
996 unsigned int count;
997
998 if (sm == NULL)
999 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1000
1001 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
1002
1003 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
1004 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
1005 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1006 }
1007
1008 if (parse.rsn == NULL) {
1009 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
1010 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1011 }
1012
1013 if (parse.rsn_pmkid == NULL) {
1014 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
1015 return WLAN_STATUS_INVALID_PMKID;
1016 }
1017
1018 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
1019 != 0) {
1020 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
1021 "with the PMKR1Name derived from auth request");
1022 return WLAN_STATUS_INVALID_PMKID;
1023 }
1024
1025 mdie = (struct rsn_mdie *) parse.mdie;
1026 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1027 os_memcmp(mdie->mobility_domain,
1028 sm->wpa_auth->conf.mobility_domain,
1029 MOBILITY_DOMAIN_ID_LEN) != 0) {
1030 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1031 return WLAN_STATUS_INVALID_MDIE;
1032 }
1033
1034 ftie = (struct rsn_ftie *) parse.ftie;
1035 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1036 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1037 return WLAN_STATUS_INVALID_FTIE;
1038 }
1039
1040 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
1041 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1042 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1043 ftie->snonce, WPA_NONCE_LEN);
1044 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1045 sm->SNonce, WPA_NONCE_LEN);
1046 return -1;
1047 }
1048
1049 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
1050 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1051 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1052 ftie->anonce, WPA_NONCE_LEN);
1053 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1054 sm->ANonce, WPA_NONCE_LEN);
1055 return -1;
1056 }
1057
1058
1059 if (parse.r0kh_id == NULL) {
1060 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1061 return -1;
1062 }
1063
1064 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1065 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1066 {
1067 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1068 "the current R0KH-ID");
1069 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1070 parse.r0kh_id, parse.r0kh_id_len);
1071 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1072 sm->r0kh_id, sm->r0kh_id_len);
1073 return -1;
1074 }
1075
1076 if (parse.r1kh_id == NULL) {
1077 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1078 return -1;
1079 }
1080
1081 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
1082 FT_R1KH_ID_LEN) != 0) {
1083 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1084 "ReassocReq");
1085 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
1086 parse.r1kh_id, FT_R1KH_ID_LEN);
1087 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
1088 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
1089 return -1;
1090 }
1091
1092 if (parse.rsn_pmkid == NULL ||
1093 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1094 {
1095 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1096 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1097 return -1;
1098 }
1099
1100 count = 3;
1101 if (parse.ric)
1102 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1103 if (ftie->mic_control[1] != count) {
1104 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1105 "Control: received %u expected %u",
1106 ftie->mic_control[1], count);
1107 return -1;
1108 }
1109
1110 if (wpa_ft_mic(sm->PTK.kck, sm->addr, sm->wpa_auth->addr, 5,
1111 parse.mdie - 2, parse.mdie_len + 2,
1112 parse.ftie - 2, parse.ftie_len + 2,
1113 parse.rsn - 2, parse.rsn_len + 2,
1114 parse.ric, parse.ric_len,
1115 mic) < 0) {
1116 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1117 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1118 }
1119
1120 if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
1121 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1122 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
1123 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
1124 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
1125 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
1126 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
1127 parse.mdie - 2, parse.mdie_len + 2);
1128 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
1129 parse.ftie - 2, parse.ftie_len + 2);
1130 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
1131 parse.rsn - 2, parse.rsn_len + 2);
1132 return WLAN_STATUS_INVALID_FTIE;
1133 }
1134
1135 return WLAN_STATUS_SUCCESS;
1136 }
1137
1138
wpa_ft_action_rx(struct wpa_state_machine * sm,const u8 * data,size_t len)1139 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1140 {
1141 const u8 *sta_addr, *target_ap;
1142 const u8 *ies;
1143 size_t ies_len;
1144 u8 action;
1145 struct ft_rrb_frame *frame;
1146
1147 if (sm == NULL)
1148 return -1;
1149
1150 /*
1151 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1152 * FT Request action frame body[variable]
1153 */
1154
1155 if (len < 14) {
1156 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1157 "(len=%lu)", (unsigned long) len);
1158 return -1;
1159 }
1160
1161 action = data[1];
1162 sta_addr = data + 2;
1163 target_ap = data + 8;
1164 ies = data + 14;
1165 ies_len = len - 14;
1166
1167 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1168 " Target AP=" MACSTR " Action=%d)",
1169 MAC2STR(sta_addr), MAC2STR(target_ap), action);
1170
1171 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1172 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1173 "STA=" MACSTR " STA-Address=" MACSTR,
1174 MAC2STR(sm->addr), MAC2STR(sta_addr));
1175 return -1;
1176 }
1177
1178 /*
1179 * Do some sanity checking on the target AP address (not own and not
1180 * broadcast. This could be extended to filter based on a list of known
1181 * APs in the MD (if such a list were configured).
1182 */
1183 if ((target_ap[0] & 0x01) ||
1184 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1185 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1186 "frame");
1187 return -1;
1188 }
1189
1190 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1191
1192 /* RRB - Forward action frame to the target AP */
1193 frame = os_malloc(sizeof(*frame) + len);
1194 if (frame == NULL)
1195 return -1;
1196 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1197 frame->packet_type = FT_PACKET_REQUEST;
1198 frame->action_length = host_to_le16(len);
1199 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1200 os_memcpy(frame + 1, data, len);
1201
1202 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1203 sizeof(*frame) + len);
1204 os_free(frame);
1205
1206 return 0;
1207 }
1208
1209
wpa_ft_rrb_rx_request_cb(void * ctx,const u8 * dst,const u8 * bssid,u16 auth_transaction,u16 resp,const u8 * ies,size_t ies_len)1210 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
1211 u16 auth_transaction, u16 resp,
1212 const u8 *ies, size_t ies_len)
1213 {
1214 struct wpa_state_machine *sm = ctx;
1215 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
1216 MAC2STR(sm->addr));
1217 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
1218 WLAN_STATUS_SUCCESS, ies, ies_len);
1219 }
1220
1221
wpa_ft_rrb_rx_request(struct wpa_authenticator * wpa_auth,const u8 * current_ap,const u8 * sta_addr,const u8 * body,size_t len)1222 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1223 const u8 *current_ap, const u8 *sta_addr,
1224 const u8 *body, size_t len)
1225 {
1226 struct wpa_state_machine *sm;
1227 u16 status;
1228 u8 *resp_ies;
1229 size_t resp_ies_len;
1230 int res;
1231
1232 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1233 if (sm == NULL) {
1234 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1235 "RRB Request");
1236 return -1;
1237 }
1238
1239 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1240
1241 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
1242 sm->ft_pending_cb_ctx = sm;
1243 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
1244 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1245 &resp_ies_len);
1246 if (res < 0) {
1247 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
1248 return 0;
1249 }
1250 status = res;
1251
1252 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
1253 resp_ies, resp_ies_len);
1254 os_free(resp_ies);
1255 return res;
1256 }
1257
1258
wpa_ft_send_rrb_auth_resp(struct wpa_state_machine * sm,const u8 * current_ap,const u8 * sta_addr,u16 status,const u8 * resp_ies,size_t resp_ies_len)1259 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
1260 const u8 *current_ap, const u8 *sta_addr,
1261 u16 status, const u8 *resp_ies,
1262 size_t resp_ies_len)
1263 {
1264 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
1265 size_t rlen;
1266 struct ft_rrb_frame *frame;
1267 u8 *pos;
1268
1269 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1270 " CurrentAP=" MACSTR " status=%d",
1271 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1272 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1273
1274 /* RRB - Forward action frame response to the Current AP */
1275
1276 /*
1277 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1278 * Status_Code[2] FT Request action frame body[variable]
1279 */
1280 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1281
1282 frame = os_malloc(sizeof(*frame) + rlen);
1283 if (frame == NULL)
1284 return -1;
1285 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1286 frame->packet_type = FT_PACKET_RESPONSE;
1287 frame->action_length = host_to_le16(rlen);
1288 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1289 pos = (u8 *) (frame + 1);
1290 *pos++ = WLAN_ACTION_FT;
1291 *pos++ = 2; /* Action: Response */
1292 os_memcpy(pos, sta_addr, ETH_ALEN);
1293 pos += ETH_ALEN;
1294 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1295 pos += ETH_ALEN;
1296 WPA_PUT_LE16(pos, status);
1297 pos += 2;
1298 if (resp_ies)
1299 os_memcpy(pos, resp_ies, resp_ies_len);
1300
1301 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1302 sizeof(*frame) + rlen);
1303 os_free(frame);
1304
1305 return 0;
1306 }
1307
1308
wpa_ft_rrb_rx_pull(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1309 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1310 const u8 *src_addr,
1311 const u8 *data, size_t data_len)
1312 {
1313 struct ft_r0kh_r1kh_pull_frame *frame, f;
1314 struct ft_remote_r1kh *r1kh;
1315 struct ft_r0kh_r1kh_resp_frame resp, r;
1316 u8 pmk_r0[PMK_LEN];
1317 int pairwise;
1318
1319 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1320
1321 if (data_len < sizeof(*frame))
1322 return -1;
1323
1324 r1kh = wpa_auth->conf.r1kh_list;
1325 while (r1kh) {
1326 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1327 break;
1328 r1kh = r1kh->next;
1329 }
1330 if (r1kh == NULL) {
1331 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1332 "PMK-R1 pull source address " MACSTR,
1333 MAC2STR(src_addr));
1334 return -1;
1335 }
1336
1337 frame = (struct ft_r0kh_r1kh_pull_frame *) data;
1338 /* aes_unwrap() does not support inplace decryption, so use a temporary
1339 * buffer for the data. */
1340 if (aes_unwrap(r1kh->key, sizeof(r1kh->key),
1341 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1342 frame->nonce, f.nonce) < 0) {
1343 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1344 "request from " MACSTR, MAC2STR(src_addr));
1345 return -1;
1346 }
1347
1348 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1349 f.nonce, sizeof(f.nonce));
1350 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1351 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1352 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1353 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1354
1355 os_memset(&resp, 0, sizeof(resp));
1356 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1357 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1358 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1359 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1360
1361 /* aes_wrap() does not support inplace encryption, so use a temporary
1362 * buffer for the data. */
1363 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1364 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1365 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1366 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1367 &pairwise) < 0) {
1368 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1369 "PMK-R1 pull");
1370 return -1;
1371 }
1372
1373 wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1374 r.pmk_r1, r.pmk_r1_name);
1375 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1376 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1377 WPA_PMK_NAME_LEN);
1378 r.pairwise = host_to_le16(pairwise);
1379 os_memset(r.pad, 0, sizeof(r.pad));
1380
1381 if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1382 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1383 r.nonce, resp.nonce) < 0) {
1384 os_memset(pmk_r0, 0, PMK_LEN);
1385 return -1;
1386 }
1387
1388 os_memset(pmk_r0, 0, PMK_LEN);
1389
1390 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1391
1392 return 0;
1393 }
1394
1395
ft_pull_resp_cb_finish(void * eloop_ctx,void * timeout_ctx)1396 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx)
1397 {
1398 struct wpa_state_machine *sm = eloop_ctx;
1399 int res;
1400 u8 *resp_ies;
1401 size_t resp_ies_len;
1402 u16 status;
1403
1404 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
1405 wpabuf_len(sm->ft_pending_req_ies),
1406 &resp_ies, &resp_ies_len);
1407 wpabuf_free(sm->ft_pending_req_ies);
1408 sm->ft_pending_req_ies = NULL;
1409 if (res < 0)
1410 res = WLAN_STATUS_UNSPECIFIED_FAILURE;
1411 status = res;
1412 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
1413 " - status %u", MAC2STR(sm->addr), status);
1414
1415 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
1416 sm->ft_pending_auth_transaction + 1, status,
1417 resp_ies, resp_ies_len);
1418 os_free(resp_ies);
1419 }
1420
1421
ft_pull_resp_cb(struct wpa_state_machine * sm,void * ctx)1422 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx)
1423 {
1424 struct ft_r0kh_r1kh_resp_frame *frame = ctx;
1425
1426 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0)
1427 return 0;
1428 if (os_memcmp(frame->nonce, sm->ft_pending_pull_nonce,
1429 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0)
1430 return 0;
1431 if (sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
1432 return 0;
1433
1434 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for "
1435 MACSTR " - process from timeout", MAC2STR(sm->addr));
1436 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL);
1437 return 1;
1438 }
1439
1440
wpa_ft_rrb_rx_resp(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1441 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1442 const u8 *src_addr,
1443 const u8 *data, size_t data_len)
1444 {
1445 struct ft_r0kh_r1kh_resp_frame *frame, f;
1446 struct ft_remote_r0kh *r0kh;
1447 int pairwise, res;
1448
1449 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1450
1451 if (data_len < sizeof(*frame))
1452 return -1;
1453
1454 r0kh = wpa_auth->conf.r0kh_list;
1455 while (r0kh) {
1456 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1457 break;
1458 r0kh = r0kh->next;
1459 }
1460 if (r0kh == NULL) {
1461 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1462 "PMK-R0 pull response source address " MACSTR,
1463 MAC2STR(src_addr));
1464 return -1;
1465 }
1466
1467 frame = (struct ft_r0kh_r1kh_resp_frame *) data;
1468 /* aes_unwrap() does not support inplace decryption, so use a temporary
1469 * buffer for the data. */
1470 if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1471 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1472 frame->nonce, f.nonce) < 0) {
1473 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1474 "response from " MACSTR, MAC2STR(src_addr));
1475 return -1;
1476 }
1477
1478 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1479 FT_R1KH_ID_LEN) != 0) {
1480 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1481 "matching R1KH-ID");
1482 return -1;
1483 }
1484
1485 pairwise = le_to_host16(f.pairwise);
1486 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1487 f.nonce, sizeof(f.nonce));
1488 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1489 MACSTR " pairwise=0x%x",
1490 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1491 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1492 f.pmk_r1, PMK_LEN);
1493 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1494 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1495
1496 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1497 pairwise);
1498 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request");
1499 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f);
1500 os_memset(f.pmk_r1, 0, PMK_LEN);
1501
1502 return res ? 0 : -1;
1503 }
1504
1505
wpa_ft_rrb_rx_push(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1506 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1507 const u8 *src_addr,
1508 const u8 *data, size_t data_len)
1509 {
1510 struct ft_r0kh_r1kh_push_frame *frame, f;
1511 struct ft_remote_r0kh *r0kh;
1512 struct os_time now;
1513 os_time_t tsend;
1514 int pairwise;
1515
1516 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1517
1518 if (data_len < sizeof(*frame))
1519 return -1;
1520
1521 r0kh = wpa_auth->conf.r0kh_list;
1522 while (r0kh) {
1523 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1524 break;
1525 r0kh = r0kh->next;
1526 }
1527 if (r0kh == NULL) {
1528 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1529 "PMK-R0 push source address " MACSTR,
1530 MAC2STR(src_addr));
1531 return -1;
1532 }
1533
1534 frame = (struct ft_r0kh_r1kh_push_frame *) data;
1535 /* aes_unwrap() does not support inplace decryption, so use a temporary
1536 * buffer for the data. */
1537 if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1538 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1539 frame->timestamp, f.timestamp) < 0) {
1540 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1541 MACSTR, MAC2STR(src_addr));
1542 return -1;
1543 }
1544
1545 os_get_time(&now);
1546 tsend = WPA_GET_LE32(f.timestamp);
1547 if ((now.sec > tsend && now.sec - tsend > 60) ||
1548 (now.sec < tsend && tsend - now.sec > 60)) {
1549 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1550 "timestamp: sender time %d own time %d\n",
1551 (int) tsend, (int) now.sec);
1552 return -1;
1553 }
1554
1555 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1556 FT_R1KH_ID_LEN) != 0) {
1557 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1558 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1559 MAC2STR(f.r1kh_id),
1560 MAC2STR(wpa_auth->conf.r1_key_holder));
1561 return -1;
1562 }
1563
1564 pairwise = le_to_host16(f.pairwise);
1565 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1566 MACSTR " pairwise=0x%x",
1567 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1568 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1569 f.pmk_r1, PMK_LEN);
1570 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1571 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1572
1573 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1574 pairwise);
1575 os_memset(f.pmk_r1, 0, PMK_LEN);
1576
1577 return 0;
1578 }
1579
1580
wpa_ft_rrb_rx(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1581 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1582 const u8 *data, size_t data_len)
1583 {
1584 struct ft_rrb_frame *frame;
1585 u16 alen;
1586 const u8 *pos, *end, *start;
1587 u8 action;
1588 const u8 *sta_addr, *target_ap_addr;
1589
1590 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1591 MAC2STR(src_addr));
1592
1593 if (data_len < sizeof(*frame)) {
1594 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1595 (unsigned long) data_len);
1596 return -1;
1597 }
1598
1599 pos = data;
1600 frame = (struct ft_rrb_frame *) pos;
1601 pos += sizeof(*frame);
1602
1603 alen = le_to_host16(frame->action_length);
1604 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1605 "action_length=%d ap_address=" MACSTR,
1606 frame->frame_type, frame->packet_type, alen,
1607 MAC2STR(frame->ap_address));
1608
1609 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1610 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1611 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1612 "unrecognized type %d", frame->frame_type);
1613 return -1;
1614 }
1615
1616 if (alen > data_len - sizeof(*frame)) {
1617 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1618 "frame");
1619 return -1;
1620 }
1621
1622 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1623 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1624 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1625 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1626 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1627 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1628
1629 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1630
1631 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1632 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1633 "room for Action Frame body); alen=%lu",
1634 (unsigned long) alen);
1635 return -1;
1636 }
1637 start = pos;
1638 end = pos + alen;
1639
1640 if (*pos != WLAN_ACTION_FT) {
1641 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1642 "%d", *pos);
1643 return -1;
1644 }
1645
1646 pos++;
1647 action = *pos++;
1648 sta_addr = pos;
1649 pos += ETH_ALEN;
1650 target_ap_addr = pos;
1651 pos += ETH_ALEN;
1652 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1653 MACSTR " target_ap_addr=" MACSTR,
1654 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1655
1656 if (frame->packet_type == FT_PACKET_REQUEST) {
1657 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1658
1659 if (action != 1) {
1660 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1661 "RRB Request", action);
1662 return -1;
1663 }
1664
1665 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1666 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1667 "RRB Request does not match with own "
1668 "address");
1669 return -1;
1670 }
1671
1672 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1673 sta_addr, pos, end - pos) < 0)
1674 return -1;
1675 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1676 u16 status_code;
1677
1678 if (end - pos < 2) {
1679 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1680 "code in RRB Response");
1681 return -1;
1682 }
1683 status_code = WPA_GET_LE16(pos);
1684 pos += 2;
1685
1686 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1687 "(status_code=%d)", status_code);
1688
1689 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1690 return -1;
1691 } else {
1692 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1693 "packet_type %d", frame->packet_type);
1694 return -1;
1695 }
1696
1697 if (end > pos) {
1698 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
1699 pos, end - pos);
1700 }
1701
1702 return 0;
1703 }
1704
1705
wpa_ft_generate_pmk_r1(struct wpa_authenticator * wpa_auth,struct wpa_ft_pmk_r0_sa * pmk_r0,struct ft_remote_r1kh * r1kh,const u8 * s1kh_id,int pairwise)1706 static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1707 struct wpa_ft_pmk_r0_sa *pmk_r0,
1708 struct ft_remote_r1kh *r1kh,
1709 const u8 *s1kh_id, int pairwise)
1710 {
1711 struct ft_r0kh_r1kh_push_frame frame, f;
1712 struct os_time now;
1713
1714 os_memset(&frame, 0, sizeof(frame));
1715 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1716 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1717 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1718 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1719
1720 /* aes_wrap() does not support inplace encryption, so use a temporary
1721 * buffer for the data. */
1722 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1723 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1724 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1725 wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1726 s1kh_id, f.pmk_r1, f.pmk_r1_name);
1727 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1728 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1729 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1730 WPA_PMK_NAME_LEN);
1731 os_get_time(&now);
1732 WPA_PUT_LE32(f.timestamp, now.sec);
1733 f.pairwise = host_to_le16(pairwise);
1734 os_memset(f.pad, 0, sizeof(f.pad));
1735 if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1736 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1737 f.timestamp, frame.timestamp) < 0)
1738 return;
1739
1740 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1741 }
1742
1743
wpa_ft_push_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * addr)1744 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1745 {
1746 struct wpa_ft_pmk_r0_sa *r0;
1747 struct ft_remote_r1kh *r1kh;
1748
1749 if (!wpa_auth->conf.pmk_r1_push)
1750 return;
1751
1752 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1753 while (r0) {
1754 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1755 break;
1756 r0 = r0->next;
1757 }
1758
1759 if (r0 == NULL || r0->pmk_r1_pushed)
1760 return;
1761 r0->pmk_r1_pushed = 1;
1762
1763 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1764 "for STA " MACSTR, MAC2STR(addr));
1765
1766 r1kh = wpa_auth->conf.r1kh_list;
1767 while (r1kh) {
1768 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1769 r1kh = r1kh->next;
1770 }
1771 }
1772
1773 #endif /* CONFIG_IEEE80211R */
1774