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