1 /*
2 * hostapd - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2004-2015, 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 "utils/list.h"
14 #include "common/ieee802_11_defs.h"
15 #include "common/ieee802_11_common.h"
16 #include "crypto/aes_wrap.h"
17 #include "crypto/random.h"
18 #include "ap_config.h"
19 #include "ieee802_11.h"
20 #include "wmm.h"
21 #include "wpa_auth.h"
22 #include "wpa_auth_i.h"
23
24
25 #ifdef CONFIG_IEEE80211R_AP
26
27 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
28 const u8 *current_ap, const u8 *sta_addr,
29 u16 status, const u8 *resp_ies,
30 size_t resp_ies_len);
31
32
wpa_ft_rrb_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)33 static int wpa_ft_rrb_send(struct wpa_authenticator *wpa_auth, const u8 *dst,
34 const u8 *data, size_t data_len)
35 {
36 if (wpa_auth->cb->send_ether == NULL)
37 return -1;
38 wpa_printf(MSG_DEBUG, "FT: RRB send to " MACSTR, MAC2STR(dst));
39 return wpa_auth->cb->send_ether(wpa_auth->cb_ctx, dst, ETH_P_RRB,
40 data, data_len);
41 }
42
43
wpa_ft_action_send(struct wpa_authenticator * wpa_auth,const u8 * dst,const u8 * data,size_t data_len)44 static int wpa_ft_action_send(struct wpa_authenticator *wpa_auth,
45 const u8 *dst, const u8 *data, size_t data_len)
46 {
47 if (wpa_auth->cb->send_ft_action == NULL)
48 return -1;
49 return wpa_auth->cb->send_ft_action(wpa_auth->cb_ctx, dst,
50 data, data_len);
51 }
52
53
wpa_ft_get_psk(struct wpa_authenticator * wpa_auth,const u8 * addr,const u8 * p2p_dev_addr,const u8 * prev_psk)54 static const u8 * wpa_ft_get_psk(struct wpa_authenticator *wpa_auth,
55 const u8 *addr, const u8 *p2p_dev_addr,
56 const u8 *prev_psk)
57 {
58 if (wpa_auth->cb->get_psk == NULL)
59 return NULL;
60 return wpa_auth->cb->get_psk(wpa_auth->cb_ctx, addr, p2p_dev_addr,
61 prev_psk);
62 }
63
64
65 static struct wpa_state_machine *
wpa_ft_add_sta(struct wpa_authenticator * wpa_auth,const u8 * sta_addr)66 wpa_ft_add_sta(struct wpa_authenticator *wpa_auth, const u8 *sta_addr)
67 {
68 if (wpa_auth->cb->add_sta == NULL)
69 return NULL;
70 return wpa_auth->cb->add_sta(wpa_auth->cb_ctx, sta_addr);
71 }
72
73
wpa_ft_add_tspec(struct wpa_authenticator * wpa_auth,const u8 * sta_addr,u8 * tspec_ie,size_t tspec_ielen)74 static int wpa_ft_add_tspec(struct wpa_authenticator *wpa_auth,
75 const u8 *sta_addr,
76 u8 *tspec_ie, size_t tspec_ielen)
77 {
78 if (wpa_auth->cb->add_tspec == NULL) {
79 wpa_printf(MSG_DEBUG, "FT: add_tspec is not initialized");
80 return -1;
81 }
82 return wpa_auth->cb->add_tspec(wpa_auth->cb_ctx, sta_addr, tspec_ie,
83 tspec_ielen);
84 }
85
86
wpa_write_mdie(struct wpa_auth_config * conf,u8 * buf,size_t len)87 int wpa_write_mdie(struct wpa_auth_config *conf, u8 *buf, size_t len)
88 {
89 u8 *pos = buf;
90 u8 capab;
91 if (len < 2 + sizeof(struct rsn_mdie))
92 return -1;
93
94 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
95 *pos++ = MOBILITY_DOMAIN_ID_LEN + 1;
96 os_memcpy(pos, conf->mobility_domain, MOBILITY_DOMAIN_ID_LEN);
97 pos += MOBILITY_DOMAIN_ID_LEN;
98 capab = 0;
99 if (conf->ft_over_ds)
100 capab |= RSN_FT_CAPAB_FT_OVER_DS;
101 *pos++ = capab;
102
103 return pos - buf;
104 }
105
106
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)107 int wpa_write_ftie(struct wpa_auth_config *conf, const u8 *r0kh_id,
108 size_t r0kh_id_len,
109 const u8 *anonce, const u8 *snonce,
110 u8 *buf, size_t len, const u8 *subelem,
111 size_t subelem_len)
112 {
113 u8 *pos = buf, *ielen;
114 struct rsn_ftie *hdr;
115
116 if (len < 2 + sizeof(*hdr) + 2 + FT_R1KH_ID_LEN + 2 + r0kh_id_len +
117 subelem_len)
118 return -1;
119
120 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
121 ielen = pos++;
122
123 hdr = (struct rsn_ftie *) pos;
124 os_memset(hdr, 0, sizeof(*hdr));
125 pos += sizeof(*hdr);
126 WPA_PUT_LE16(hdr->mic_control, 0);
127 if (anonce)
128 os_memcpy(hdr->anonce, anonce, WPA_NONCE_LEN);
129 if (snonce)
130 os_memcpy(hdr->snonce, snonce, WPA_NONCE_LEN);
131
132 /* Optional Parameters */
133 *pos++ = FTIE_SUBELEM_R1KH_ID;
134 *pos++ = FT_R1KH_ID_LEN;
135 os_memcpy(pos, conf->r1_key_holder, FT_R1KH_ID_LEN);
136 pos += FT_R1KH_ID_LEN;
137
138 if (r0kh_id) {
139 *pos++ = FTIE_SUBELEM_R0KH_ID;
140 *pos++ = r0kh_id_len;
141 os_memcpy(pos, r0kh_id, r0kh_id_len);
142 pos += r0kh_id_len;
143 }
144
145 if (subelem) {
146 os_memcpy(pos, subelem, subelem_len);
147 pos += subelem_len;
148 }
149
150 *ielen = pos - buf - 2;
151
152 return pos - buf;
153 }
154
155
156 struct wpa_ft_pmk_r0_sa {
157 struct wpa_ft_pmk_r0_sa *next;
158 u8 pmk_r0[PMK_LEN];
159 u8 pmk_r0_name[WPA_PMK_NAME_LEN];
160 u8 spa[ETH_ALEN];
161 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
162 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
163 int pmk_r1_pushed;
164 };
165
166 struct wpa_ft_pmk_r1_sa {
167 struct wpa_ft_pmk_r1_sa *next;
168 u8 pmk_r1[PMK_LEN];
169 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
170 u8 spa[ETH_ALEN];
171 int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
172 /* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
173 };
174
175 struct wpa_ft_pmk_cache {
176 struct wpa_ft_pmk_r0_sa *pmk_r0;
177 struct wpa_ft_pmk_r1_sa *pmk_r1;
178 };
179
wpa_ft_pmk_cache_init(void)180 struct wpa_ft_pmk_cache * wpa_ft_pmk_cache_init(void)
181 {
182 struct wpa_ft_pmk_cache *cache;
183
184 cache = os_zalloc(sizeof(*cache));
185
186 return cache;
187 }
188
189
wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache * cache)190 void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
191 {
192 struct wpa_ft_pmk_r0_sa *r0, *r0prev;
193 struct wpa_ft_pmk_r1_sa *r1, *r1prev;
194
195 r0 = cache->pmk_r0;
196 while (r0) {
197 r0prev = r0;
198 r0 = r0->next;
199 os_memset(r0prev->pmk_r0, 0, PMK_LEN);
200 os_free(r0prev);
201 }
202
203 r1 = cache->pmk_r1;
204 while (r1) {
205 r1prev = r1;
206 r1 = r1->next;
207 os_memset(r1prev->pmk_r1, 0, PMK_LEN);
208 os_free(r1prev);
209 }
210
211 os_free(cache);
212 }
213
214
wpa_ft_store_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0,const u8 * pmk_r0_name,int pairwise)215 static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
216 const u8 *spa, const u8 *pmk_r0,
217 const u8 *pmk_r0_name, int pairwise)
218 {
219 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
220 struct wpa_ft_pmk_r0_sa *r0;
221
222 /* TODO: add expiration and limit on number of entries in cache */
223
224 r0 = os_zalloc(sizeof(*r0));
225 if (r0 == NULL)
226 return -1;
227
228 os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
229 os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
230 os_memcpy(r0->spa, spa, ETH_ALEN);
231 r0->pairwise = pairwise;
232
233 r0->next = cache->pmk_r0;
234 cache->pmk_r0 = r0;
235
236 return 0;
237 }
238
239
wpa_ft_fetch_pmk_r0(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r0_name,u8 * pmk_r0,int * pairwise)240 static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
241 const u8 *spa, const u8 *pmk_r0_name,
242 u8 *pmk_r0, int *pairwise)
243 {
244 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
245 struct wpa_ft_pmk_r0_sa *r0;
246
247 r0 = cache->pmk_r0;
248 while (r0) {
249 if (os_memcmp(r0->spa, spa, ETH_ALEN) == 0 &&
250 os_memcmp_const(r0->pmk_r0_name, pmk_r0_name,
251 WPA_PMK_NAME_LEN) == 0) {
252 os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
253 if (pairwise)
254 *pairwise = r0->pairwise;
255 return 0;
256 }
257
258 r0 = r0->next;
259 }
260
261 return -1;
262 }
263
264
wpa_ft_store_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1,const u8 * pmk_r1_name,int pairwise)265 static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
266 const u8 *spa, const u8 *pmk_r1,
267 const u8 *pmk_r1_name, int pairwise)
268 {
269 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
270 struct wpa_ft_pmk_r1_sa *r1;
271
272 /* TODO: add expiration and limit on number of entries in cache */
273
274 r1 = os_zalloc(sizeof(*r1));
275 if (r1 == NULL)
276 return -1;
277
278 os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
279 os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
280 os_memcpy(r1->spa, spa, ETH_ALEN);
281 r1->pairwise = pairwise;
282
283 r1->next = cache->pmk_r1;
284 cache->pmk_r1 = r1;
285
286 return 0;
287 }
288
289
wpa_ft_fetch_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * spa,const u8 * pmk_r1_name,u8 * pmk_r1,int * pairwise)290 static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
291 const u8 *spa, const u8 *pmk_r1_name,
292 u8 *pmk_r1, int *pairwise)
293 {
294 struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
295 struct wpa_ft_pmk_r1_sa *r1;
296
297 r1 = cache->pmk_r1;
298 while (r1) {
299 if (os_memcmp(r1->spa, spa, ETH_ALEN) == 0 &&
300 os_memcmp_const(r1->pmk_r1_name, pmk_r1_name,
301 WPA_PMK_NAME_LEN) == 0) {
302 os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
303 if (pairwise)
304 *pairwise = r1->pairwise;
305 return 0;
306 }
307
308 r1 = r1->next;
309 }
310
311 return -1;
312 }
313
314
wpa_ft_pull_pmk_r1(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len,const u8 * pmk_r0_name)315 static int wpa_ft_pull_pmk_r1(struct wpa_state_machine *sm,
316 const u8 *ies, size_t ies_len,
317 const u8 *pmk_r0_name)
318 {
319 struct ft_remote_r0kh *r0kh;
320 struct ft_r0kh_r1kh_pull_frame frame, f;
321
322 r0kh = sm->wpa_auth->conf.r0kh_list;
323 while (r0kh) {
324 if (r0kh->id_len == sm->r0kh_id_len &&
325 os_memcmp_const(r0kh->id, sm->r0kh_id, sm->r0kh_id_len) ==
326 0)
327 break;
328 r0kh = r0kh->next;
329 }
330 if (r0kh == NULL) {
331 wpa_hexdump(MSG_DEBUG, "FT: Did not find R0KH-ID",
332 sm->r0kh_id, sm->r0kh_id_len);
333 return -1;
334 }
335
336 wpa_printf(MSG_DEBUG, "FT: Send PMK-R1 pull request to remote R0KH "
337 "address " MACSTR, MAC2STR(r0kh->addr));
338
339 os_memset(&frame, 0, sizeof(frame));
340 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
341 frame.packet_type = FT_PACKET_R0KH_R1KH_PULL;
342 frame.data_length = host_to_le16(FT_R0KH_R1KH_PULL_DATA_LEN);
343 os_memcpy(frame.ap_address, sm->wpa_auth->addr, ETH_ALEN);
344
345 /* aes_wrap() does not support inplace encryption, so use a temporary
346 * buffer for the data. */
347 if (random_get_bytes(f.nonce, FT_R0KH_R1KH_PULL_NONCE_LEN)) {
348 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
349 "nonce");
350 return -1;
351 }
352 os_memcpy(sm->ft_pending_pull_nonce, f.nonce,
353 FT_R0KH_R1KH_PULL_NONCE_LEN);
354 os_memcpy(f.pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
355 os_memcpy(f.r1kh_id, sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
356 os_memcpy(f.s1kh_id, sm->addr, ETH_ALEN);
357 os_memset(f.pad, 0, sizeof(f.pad));
358
359 if (aes_wrap(r0kh->key, sizeof(r0kh->key),
360 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
361 f.nonce, frame.nonce) < 0)
362 return -1;
363
364 wpabuf_free(sm->ft_pending_req_ies);
365 sm->ft_pending_req_ies = wpabuf_alloc_copy(ies, ies_len);
366 if (sm->ft_pending_req_ies == NULL)
367 return -1;
368
369 wpa_ft_rrb_send(sm->wpa_auth, r0kh->addr, (u8 *) &frame, sizeof(frame));
370
371 return 0;
372 }
373
374
wpa_auth_derive_ptk_ft(struct wpa_state_machine * sm,const u8 * pmk,struct wpa_ptk * ptk)375 int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
376 struct wpa_ptk *ptk)
377 {
378 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
379 u8 pmk_r1[PMK_LEN];
380 u8 ptk_name[WPA_PMK_NAME_LEN];
381 const u8 *mdid = sm->wpa_auth->conf.mobility_domain;
382 const u8 *r0kh = sm->wpa_auth->conf.r0_key_holder;
383 size_t r0kh_len = sm->wpa_auth->conf.r0_key_holder_len;
384 const u8 *r1kh = sm->wpa_auth->conf.r1_key_holder;
385 const u8 *ssid = sm->wpa_auth->conf.ssid;
386 size_t ssid_len = sm->wpa_auth->conf.ssid_len;
387 int psk_local = sm->wpa_auth->conf.ft_psk_generate_local;
388
389 if (sm->xxkey_len == 0) {
390 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
391 "derivation");
392 return -1;
393 }
394
395 if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
396 r0kh, r0kh_len, sm->addr,
397 pmk_r0, pmk_r0_name) < 0)
398 return -1;
399 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
400 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
401 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
402 wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
403 sm->pairwise);
404
405 if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
406 pmk_r1, sm->pmk_r1_name) < 0)
407 return -1;
408 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
409 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
410 WPA_PMK_NAME_LEN);
411 if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
412 wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1,
413 sm->pmk_r1_name, sm->pairwise);
414
415 return wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
416 sm->wpa_auth->addr, sm->pmk_r1_name,
417 ptk, ptk_name, sm->wpa_key_mgmt, sm->pairwise);
418 }
419
420
wpa_auth_get_seqnum(struct wpa_authenticator * wpa_auth,const u8 * addr,int idx,u8 * seq)421 static inline int wpa_auth_get_seqnum(struct wpa_authenticator *wpa_auth,
422 const u8 *addr, int idx, u8 *seq)
423 {
424 if (wpa_auth->cb->get_seqnum == NULL)
425 return -1;
426 return wpa_auth->cb->get_seqnum(wpa_auth->cb_ctx, addr, idx, seq);
427 }
428
429
wpa_ft_gtk_subelem(struct wpa_state_machine * sm,size_t * len)430 static u8 * wpa_ft_gtk_subelem(struct wpa_state_machine *sm, size_t *len)
431 {
432 u8 *subelem;
433 struct wpa_group *gsm = sm->group;
434 size_t subelem_len, pad_len;
435 const u8 *key;
436 size_t key_len;
437 u8 keybuf[32];
438
439 key_len = gsm->GTK_len;
440 if (key_len > sizeof(keybuf))
441 return NULL;
442
443 /*
444 * Pad key for AES Key Wrap if it is not multiple of 8 bytes or is less
445 * than 16 bytes.
446 */
447 pad_len = key_len % 8;
448 if (pad_len)
449 pad_len = 8 - pad_len;
450 if (key_len + pad_len < 16)
451 pad_len += 8;
452 if (pad_len && key_len < sizeof(keybuf)) {
453 os_memcpy(keybuf, gsm->GTK[gsm->GN - 1], key_len);
454 os_memset(keybuf + key_len, 0, pad_len);
455 keybuf[key_len] = 0xdd;
456 key_len += pad_len;
457 key = keybuf;
458 } else
459 key = gsm->GTK[gsm->GN - 1];
460
461 /*
462 * Sub-elem ID[1] | Length[1] | Key Info[2] | Key Length[1] | RSC[8] |
463 * Key[5..32].
464 */
465 subelem_len = 13 + key_len + 8;
466 subelem = os_zalloc(subelem_len);
467 if (subelem == NULL)
468 return NULL;
469
470 subelem[0] = FTIE_SUBELEM_GTK;
471 subelem[1] = 11 + key_len + 8;
472 /* Key ID in B0-B1 of Key Info */
473 WPA_PUT_LE16(&subelem[2], gsm->GN & 0x03);
474 subelem[4] = gsm->GTK_len;
475 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN, subelem + 5);
476 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, key_len / 8, key,
477 subelem + 13)) {
478 os_free(subelem);
479 return NULL;
480 }
481
482 *len = subelem_len;
483 return subelem;
484 }
485
486
487 #ifdef CONFIG_IEEE80211W
wpa_ft_igtk_subelem(struct wpa_state_machine * sm,size_t * len)488 static u8 * wpa_ft_igtk_subelem(struct wpa_state_machine *sm, size_t *len)
489 {
490 u8 *subelem, *pos;
491 struct wpa_group *gsm = sm->group;
492 size_t subelem_len;
493
494 /* Sub-elem ID[1] | Length[1] | KeyID[2] | IPN[6] | Key Length[1] |
495 * Key[16+8] */
496 subelem_len = 1 + 1 + 2 + 6 + 1 + WPA_IGTK_LEN + 8;
497 subelem = os_zalloc(subelem_len);
498 if (subelem == NULL)
499 return NULL;
500
501 pos = subelem;
502 *pos++ = FTIE_SUBELEM_IGTK;
503 *pos++ = subelem_len - 2;
504 WPA_PUT_LE16(pos, gsm->GN_igtk);
505 pos += 2;
506 wpa_auth_get_seqnum(sm->wpa_auth, NULL, gsm->GN_igtk, pos);
507 pos += 6;
508 *pos++ = WPA_IGTK_LEN;
509 if (aes_wrap(sm->PTK.kek, sm->PTK.kek_len, WPA_IGTK_LEN / 8,
510 gsm->IGTK[gsm->GN_igtk - 4], pos)) {
511 os_free(subelem);
512 return NULL;
513 }
514
515 *len = subelem_len;
516 return subelem;
517 }
518 #endif /* CONFIG_IEEE80211W */
519
520
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)521 static u8 * wpa_ft_process_rdie(struct wpa_state_machine *sm,
522 u8 *pos, u8 *end, u8 id, u8 descr_count,
523 const u8 *ies, size_t ies_len)
524 {
525 struct ieee802_11_elems parse;
526 struct rsn_rdie *rdie;
527
528 wpa_printf(MSG_DEBUG, "FT: Resource Request: id=%d descr_count=%d",
529 id, descr_count);
530 wpa_hexdump(MSG_MSGDUMP, "FT: Resource descriptor IE(s)",
531 ies, ies_len);
532
533 if (end - pos < (int) sizeof(*rdie)) {
534 wpa_printf(MSG_ERROR, "FT: Not enough room for response RDIE");
535 return pos;
536 }
537
538 *pos++ = WLAN_EID_RIC_DATA;
539 *pos++ = sizeof(*rdie);
540 rdie = (struct rsn_rdie *) pos;
541 rdie->id = id;
542 rdie->descr_count = 0;
543 rdie->status_code = host_to_le16(WLAN_STATUS_SUCCESS);
544 pos += sizeof(*rdie);
545
546 if (ieee802_11_parse_elems((u8 *) ies, ies_len, &parse, 1) ==
547 ParseFailed) {
548 wpa_printf(MSG_DEBUG, "FT: Failed to parse request IEs");
549 rdie->status_code =
550 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
551 return pos;
552 }
553
554 if (parse.wmm_tspec) {
555 struct wmm_tspec_element *tspec;
556
557 if (parse.wmm_tspec_len + 2 < (int) sizeof(*tspec)) {
558 wpa_printf(MSG_DEBUG, "FT: Too short WMM TSPEC IE "
559 "(%d)", (int) parse.wmm_tspec_len);
560 rdie->status_code =
561 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
562 return pos;
563 }
564 if (end - pos < (int) sizeof(*tspec)) {
565 wpa_printf(MSG_ERROR, "FT: Not enough room for "
566 "response TSPEC");
567 rdie->status_code =
568 host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
569 return pos;
570 }
571 tspec = (struct wmm_tspec_element *) pos;
572 os_memcpy(tspec, parse.wmm_tspec - 2, sizeof(*tspec));
573 }
574
575 #ifdef NEED_AP_MLME
576 if (parse.wmm_tspec && sm->wpa_auth->conf.ap_mlme) {
577 int res;
578
579 res = wmm_process_tspec((struct wmm_tspec_element *) pos);
580 wpa_printf(MSG_DEBUG, "FT: ADDTS processing result: %d", res);
581 if (res == WMM_ADDTS_STATUS_INVALID_PARAMETERS)
582 rdie->status_code =
583 host_to_le16(WLAN_STATUS_INVALID_PARAMETERS);
584 else if (res == WMM_ADDTS_STATUS_REFUSED)
585 rdie->status_code =
586 host_to_le16(WLAN_STATUS_REQUEST_DECLINED);
587 else {
588 /* TSPEC accepted; include updated TSPEC in response */
589 rdie->descr_count = 1;
590 pos += sizeof(struct wmm_tspec_element);
591 }
592 return pos;
593 }
594 #endif /* NEED_AP_MLME */
595
596 if (parse.wmm_tspec && !sm->wpa_auth->conf.ap_mlme) {
597 int res;
598
599 res = wpa_ft_add_tspec(sm->wpa_auth, sm->addr, pos,
600 sizeof(struct wmm_tspec_element));
601 if (res >= 0) {
602 if (res)
603 rdie->status_code = host_to_le16(res);
604 else {
605 /* TSPEC accepted; include updated TSPEC in
606 * response */
607 rdie->descr_count = 1;
608 pos += sizeof(struct wmm_tspec_element);
609 }
610 return pos;
611 }
612 }
613
614 wpa_printf(MSG_DEBUG, "FT: No supported resource requested");
615 rdie->status_code = host_to_le16(WLAN_STATUS_UNSPECIFIED_FAILURE);
616 return pos;
617 }
618
619
wpa_ft_process_ric(struct wpa_state_machine * sm,u8 * pos,u8 * end,const u8 * ric,size_t ric_len)620 static u8 * wpa_ft_process_ric(struct wpa_state_machine *sm, u8 *pos, u8 *end,
621 const u8 *ric, size_t ric_len)
622 {
623 const u8 *rpos, *start;
624 const struct rsn_rdie *rdie;
625
626 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Request", ric, ric_len);
627
628 rpos = ric;
629 while (rpos + sizeof(*rdie) < ric + ric_len) {
630 if (rpos[0] != WLAN_EID_RIC_DATA || rpos[1] < sizeof(*rdie) ||
631 rpos + 2 + rpos[1] > ric + ric_len)
632 break;
633 rdie = (const struct rsn_rdie *) (rpos + 2);
634 rpos += 2 + rpos[1];
635 start = rpos;
636
637 while (rpos + 2 <= ric + ric_len &&
638 rpos + 2 + rpos[1] <= ric + ric_len) {
639 if (rpos[0] == WLAN_EID_RIC_DATA)
640 break;
641 rpos += 2 + rpos[1];
642 }
643 pos = wpa_ft_process_rdie(sm, pos, end, rdie->id,
644 rdie->descr_count,
645 start, rpos - start);
646 }
647
648 return pos;
649 }
650
651
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)652 u8 * wpa_sm_write_assoc_resp_ies(struct wpa_state_machine *sm, u8 *pos,
653 size_t max_len, int auth_alg,
654 const u8 *req_ies, size_t req_ies_len)
655 {
656 u8 *end, *mdie, *ftie, *rsnie = NULL, *r0kh_id, *subelem = NULL;
657 size_t mdie_len, ftie_len, rsnie_len = 0, r0kh_id_len, subelem_len = 0;
658 int res;
659 struct wpa_auth_config *conf;
660 struct rsn_ftie *_ftie;
661 struct wpa_ft_ies parse;
662 u8 *ric_start;
663 u8 *anonce, *snonce;
664
665 if (sm == NULL)
666 return pos;
667
668 conf = &sm->wpa_auth->conf;
669
670 if (!wpa_key_mgmt_ft(sm->wpa_key_mgmt))
671 return pos;
672
673 end = pos + max_len;
674
675 if (auth_alg == WLAN_AUTH_FT) {
676 /*
677 * RSN (only present if this is a Reassociation Response and
678 * part of a fast BSS transition)
679 */
680 res = wpa_write_rsn_ie(conf, pos, end - pos, sm->pmk_r1_name);
681 if (res < 0)
682 return pos;
683 rsnie = pos;
684 rsnie_len = res;
685 pos += res;
686 }
687
688 /* Mobility Domain Information */
689 res = wpa_write_mdie(conf, pos, end - pos);
690 if (res < 0)
691 return pos;
692 mdie = pos;
693 mdie_len = res;
694 pos += res;
695
696 /* Fast BSS Transition Information */
697 if (auth_alg == WLAN_AUTH_FT) {
698 subelem = wpa_ft_gtk_subelem(sm, &subelem_len);
699 r0kh_id = sm->r0kh_id;
700 r0kh_id_len = sm->r0kh_id_len;
701 anonce = sm->ANonce;
702 snonce = sm->SNonce;
703 #ifdef CONFIG_IEEE80211W
704 if (sm->mgmt_frame_prot) {
705 u8 *igtk;
706 size_t igtk_len;
707 u8 *nbuf;
708 igtk = wpa_ft_igtk_subelem(sm, &igtk_len);
709 if (igtk == NULL) {
710 os_free(subelem);
711 return pos;
712 }
713 nbuf = os_realloc(subelem, subelem_len + igtk_len);
714 if (nbuf == NULL) {
715 os_free(subelem);
716 os_free(igtk);
717 return pos;
718 }
719 subelem = nbuf;
720 os_memcpy(subelem + subelem_len, igtk, igtk_len);
721 subelem_len += igtk_len;
722 os_free(igtk);
723 }
724 #endif /* CONFIG_IEEE80211W */
725 } else {
726 r0kh_id = conf->r0_key_holder;
727 r0kh_id_len = conf->r0_key_holder_len;
728 anonce = NULL;
729 snonce = NULL;
730 }
731 res = wpa_write_ftie(conf, r0kh_id, r0kh_id_len, anonce, snonce, pos,
732 end - pos, subelem, subelem_len);
733 os_free(subelem);
734 if (res < 0)
735 return pos;
736 ftie = pos;
737 ftie_len = res;
738 pos += res;
739
740 _ftie = (struct rsn_ftie *) (ftie + 2);
741 if (auth_alg == WLAN_AUTH_FT)
742 _ftie->mic_control[1] = 3; /* Information element count */
743
744 ric_start = pos;
745 if (wpa_ft_parse_ies(req_ies, req_ies_len, &parse) == 0 && parse.ric) {
746 pos = wpa_ft_process_ric(sm, pos, end, parse.ric,
747 parse.ric_len);
748 if (auth_alg == WLAN_AUTH_FT)
749 _ftie->mic_control[1] +=
750 ieee802_11_ie_count(ric_start,
751 pos - ric_start);
752 }
753 if (ric_start == pos)
754 ric_start = NULL;
755
756 if (auth_alg == WLAN_AUTH_FT &&
757 wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
758 sm->wpa_auth->addr, 6,
759 mdie, mdie_len, ftie, ftie_len,
760 rsnie, rsnie_len,
761 ric_start, ric_start ? pos - ric_start : 0,
762 _ftie->mic) < 0)
763 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
764
765 os_free(sm->assoc_resp_ftie);
766 sm->assoc_resp_ftie = os_malloc(ftie_len);
767 if (sm->assoc_resp_ftie)
768 os_memcpy(sm->assoc_resp_ftie, ftie, ftie_len);
769
770 return pos;
771 }
772
773
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)774 static inline int wpa_auth_set_key(struct wpa_authenticator *wpa_auth,
775 int vlan_id,
776 enum wpa_alg alg, const u8 *addr, int idx,
777 u8 *key, size_t key_len)
778 {
779 if (wpa_auth->cb->set_key == NULL)
780 return -1;
781 return wpa_auth->cb->set_key(wpa_auth->cb_ctx, vlan_id, alg, addr, idx,
782 key, key_len);
783 }
784
785
wpa_ft_install_ptk(struct wpa_state_machine * sm)786 void wpa_ft_install_ptk(struct wpa_state_machine *sm)
787 {
788 enum wpa_alg alg;
789 int klen;
790
791 /* MLME-SETKEYS.request(PTK) */
792 alg = wpa_cipher_to_alg(sm->pairwise);
793 klen = wpa_cipher_key_len(sm->pairwise);
794 if (!wpa_cipher_valid_pairwise(sm->pairwise)) {
795 wpa_printf(MSG_DEBUG, "FT: Unknown pairwise alg 0x%x - skip "
796 "PTK configuration", sm->pairwise);
797 return;
798 }
799
800 /* FIX: add STA entry to kernel/driver here? The set_key will fail
801 * most likely without this.. At the moment, STA entry is added only
802 * after association has been completed. This function will be called
803 * again after association to get the PTK configured, but that could be
804 * optimized by adding the STA entry earlier.
805 */
806 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
807 sm->PTK.tk, klen))
808 return;
809
810 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
811 sm->pairwise_set = TRUE;
812 }
813
814
815 /* Derive PMK-R1 from PSK, check all available PSK */
wpa_ft_psk_pmk_r1(struct wpa_state_machine * sm,const u8 * req_pmk_r1_name,u8 * out_pmk_r1,int * out_pairwise)816 static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
817 const u8 *req_pmk_r1_name,
818 u8 *out_pmk_r1, int *out_pairwise)
819 {
820 const u8 *pmk = NULL;
821 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
822 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
823 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
824 const u8 *mdid = wpa_auth->conf.mobility_domain;
825 const u8 *r0kh = sm->r0kh_id;
826 size_t r0kh_len = sm->r0kh_id_len;
827 const u8 *r1kh = wpa_auth->conf.r1_key_holder;
828 const u8 *ssid = wpa_auth->conf.ssid;
829 size_t ssid_len = wpa_auth->conf.ssid_len;
830 int pairwise;
831
832 pairwise = sm->pairwise;
833
834 for (;;) {
835 pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr,
836 pmk);
837 if (pmk == NULL)
838 break;
839
840 if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
841 r0kh_len, sm->addr,
842 pmk_r0, pmk_r0_name) < 0 ||
843 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
844 pmk_r1, pmk_r1_name) < 0 ||
845 os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
846 WPA_PMK_NAME_LEN) != 0)
847 continue;
848
849 /* We found a PSK that matches the requested pmk_r1_name */
850 wpa_printf(MSG_DEBUG,
851 "FT: Found PSK to generate PMK-R1 locally");
852 os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN);
853 if (out_pairwise)
854 *out_pairwise = pairwise;
855 return 0;
856 }
857
858 wpa_printf(MSG_DEBUG,
859 "FT: Did not find PSK to generate PMK-R1 locally");
860 return -1;
861 }
862
863
864 /* Detect the configuration the station asked for.
865 * Required to detect FT-PSK and pairwise cipher.
866 */
wpa_ft_set_key_mgmt(struct wpa_state_machine * sm,struct wpa_ft_ies * parse)867 static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm,
868 struct wpa_ft_ies *parse)
869 {
870 int key_mgmt, ciphers;
871
872 if (sm->wpa_key_mgmt)
873 return 0;
874
875 key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt;
876 if (!key_mgmt) {
877 wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from "
878 MACSTR, parse->key_mgmt, MAC2STR(sm->addr));
879 return -1;
880 }
881 if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X)
882 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
883 else if (key_mgmt & WPA_KEY_MGMT_FT_PSK)
884 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK;
885 ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise;
886 if (!ciphers) {
887 wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from "
888 MACSTR,
889 parse->pairwise_cipher, MAC2STR(sm->addr));
890 return -1;
891 }
892 sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0);
893
894 return 0;
895 }
896
897
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)898 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
899 const u8 *ies, size_t ies_len,
900 u8 **resp_ies, size_t *resp_ies_len)
901 {
902 struct rsn_mdie *mdie;
903 struct rsn_ftie *ftie;
904 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
905 u8 ptk_name[WPA_PMK_NAME_LEN];
906 struct wpa_auth_config *conf;
907 struct wpa_ft_ies parse;
908 size_t buflen;
909 int ret;
910 u8 *pos, *end;
911 int pairwise;
912
913 *resp_ies = NULL;
914 *resp_ies_len = 0;
915
916 sm->pmk_r1_name_valid = 0;
917 conf = &sm->wpa_auth->conf;
918
919 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
920 ies, ies_len);
921
922 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
923 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
924 return WLAN_STATUS_UNSPECIFIED_FAILURE;
925 }
926
927 mdie = (struct rsn_mdie *) parse.mdie;
928 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
929 os_memcmp(mdie->mobility_domain,
930 sm->wpa_auth->conf.mobility_domain,
931 MOBILITY_DOMAIN_ID_LEN) != 0) {
932 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
933 return WLAN_STATUS_INVALID_MDIE;
934 }
935
936 ftie = (struct rsn_ftie *) parse.ftie;
937 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
938 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
939 return WLAN_STATUS_INVALID_FTIE;
940 }
941
942 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
943
944 if (parse.r0kh_id == NULL) {
945 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
946 return WLAN_STATUS_INVALID_FTIE;
947 }
948
949 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
950 parse.r0kh_id, parse.r0kh_id_len);
951 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
952 sm->r0kh_id_len = parse.r0kh_id_len;
953
954 if (parse.rsn_pmkid == NULL) {
955 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
956 return WLAN_STATUS_INVALID_PMKID;
957 }
958
959 if (wpa_ft_set_key_mgmt(sm, &parse) < 0)
960 return WLAN_STATUS_UNSPECIFIED_FAILURE;
961
962 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
963 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
964 if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
965 sm->wpa_auth->conf.r1_key_holder, sm->addr,
966 pmk_r1_name) < 0)
967 return WLAN_STATUS_UNSPECIFIED_FAILURE;
968 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
969 pmk_r1_name, WPA_PMK_NAME_LEN);
970
971 if (conf->ft_psk_generate_local &&
972 wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
973 if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise) < 0)
974 return WLAN_STATUS_INVALID_PMKID;
975 } else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name,
976 pmk_r1, &pairwise) < 0) {
977 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
978 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
979 "PMK-R1 and unknown R0KH-ID");
980 return WLAN_STATUS_INVALID_PMKID;
981 }
982
983 return -1; /* Status pending */
984 }
985
986 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
987 sm->pmk_r1_name_valid = 1;
988 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
989
990 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
991 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
992 "ANonce");
993 return WLAN_STATUS_UNSPECIFIED_FAILURE;
994 }
995
996 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
997 sm->SNonce, WPA_NONCE_LEN);
998 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
999 sm->ANonce, WPA_NONCE_LEN);
1000
1001 if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
1002 sm->wpa_auth->addr, pmk_r1_name,
1003 &sm->PTK, ptk_name, sm->wpa_key_mgmt,
1004 pairwise) < 0)
1005 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1006
1007 sm->pairwise = pairwise;
1008 sm->PTK_valid = TRUE;
1009 wpa_ft_install_ptk(sm);
1010
1011 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
1012 2 + FT_R1KH_ID_LEN + 200;
1013 *resp_ies = os_zalloc(buflen);
1014 if (*resp_ies == NULL)
1015 goto fail;
1016
1017 pos = *resp_ies;
1018 end = *resp_ies + buflen;
1019
1020 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
1021 if (ret < 0)
1022 goto fail;
1023 pos += ret;
1024
1025 ret = wpa_write_mdie(conf, pos, end - pos);
1026 if (ret < 0)
1027 goto fail;
1028 pos += ret;
1029
1030 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
1031 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
1032 if (ret < 0)
1033 goto fail;
1034 pos += ret;
1035
1036 *resp_ies_len = pos - *resp_ies;
1037
1038 return WLAN_STATUS_SUCCESS;
1039 fail:
1040 os_free(*resp_ies);
1041 *resp_ies = NULL;
1042 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1043 }
1044
1045
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)1046 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
1047 u16 auth_transaction, const u8 *ies, size_t ies_len,
1048 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
1049 u16 auth_transaction, u16 status,
1050 const u8 *ies, size_t ies_len),
1051 void *ctx)
1052 {
1053 u16 status;
1054 u8 *resp_ies;
1055 size_t resp_ies_len;
1056 int res;
1057
1058 if (sm == NULL) {
1059 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
1060 "WPA SM not available");
1061 return;
1062 }
1063
1064 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
1065 " BSSID=" MACSTR " transaction=%d",
1066 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
1067 sm->ft_pending_cb = cb;
1068 sm->ft_pending_cb_ctx = ctx;
1069 sm->ft_pending_auth_transaction = auth_transaction;
1070 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
1071 &resp_ies_len);
1072 if (res < 0) {
1073 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
1074 return;
1075 }
1076 status = res;
1077
1078 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
1079 " auth_transaction=%d status=%d",
1080 MAC2STR(sm->addr), auth_transaction + 1, status);
1081 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1082 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
1083 resp_ies, resp_ies_len);
1084 os_free(resp_ies);
1085 }
1086
1087
wpa_ft_validate_reassoc(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)1088 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
1089 size_t ies_len)
1090 {
1091 struct wpa_ft_ies parse;
1092 struct rsn_mdie *mdie;
1093 struct rsn_ftie *ftie;
1094 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
1095 size_t mic_len = 16;
1096 unsigned int count;
1097
1098 if (sm == NULL)
1099 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1100
1101 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
1102
1103 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
1104 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
1105 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1106 }
1107
1108 if (parse.rsn == NULL) {
1109 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
1110 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1111 }
1112
1113 if (parse.rsn_pmkid == NULL) {
1114 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
1115 return WLAN_STATUS_INVALID_PMKID;
1116 }
1117
1118 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
1119 != 0) {
1120 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
1121 "with the PMKR1Name derived from auth request");
1122 return WLAN_STATUS_INVALID_PMKID;
1123 }
1124
1125 mdie = (struct rsn_mdie *) parse.mdie;
1126 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1127 os_memcmp(mdie->mobility_domain,
1128 sm->wpa_auth->conf.mobility_domain,
1129 MOBILITY_DOMAIN_ID_LEN) != 0) {
1130 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1131 return WLAN_STATUS_INVALID_MDIE;
1132 }
1133
1134 ftie = (struct rsn_ftie *) parse.ftie;
1135 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1136 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1137 return WLAN_STATUS_INVALID_FTIE;
1138 }
1139
1140 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
1141 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1142 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1143 ftie->snonce, WPA_NONCE_LEN);
1144 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1145 sm->SNonce, WPA_NONCE_LEN);
1146 return WLAN_STATUS_INVALID_FTIE;
1147 }
1148
1149 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
1150 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1151 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1152 ftie->anonce, WPA_NONCE_LEN);
1153 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1154 sm->ANonce, WPA_NONCE_LEN);
1155 return WLAN_STATUS_INVALID_FTIE;
1156 }
1157
1158
1159 if (parse.r0kh_id == NULL) {
1160 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1161 return WLAN_STATUS_INVALID_FTIE;
1162 }
1163
1164 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1165 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1166 {
1167 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1168 "the current R0KH-ID");
1169 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1170 parse.r0kh_id, parse.r0kh_id_len);
1171 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1172 sm->r0kh_id, sm->r0kh_id_len);
1173 return WLAN_STATUS_INVALID_FTIE;
1174 }
1175
1176 if (parse.r1kh_id == NULL) {
1177 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1178 return WLAN_STATUS_INVALID_FTIE;
1179 }
1180
1181 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
1182 FT_R1KH_ID_LEN) != 0) {
1183 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1184 "ReassocReq");
1185 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
1186 parse.r1kh_id, FT_R1KH_ID_LEN);
1187 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
1188 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
1189 return WLAN_STATUS_INVALID_FTIE;
1190 }
1191
1192 if (parse.rsn_pmkid == NULL ||
1193 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1194 {
1195 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1196 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1197 return WLAN_STATUS_INVALID_PMKID;
1198 }
1199
1200 count = 3;
1201 if (parse.ric)
1202 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1203 if (ftie->mic_control[1] != count) {
1204 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1205 "Control: received %u expected %u",
1206 ftie->mic_control[1], count);
1207 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1208 }
1209
1210 if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
1211 sm->wpa_auth->addr, 5,
1212 parse.mdie - 2, parse.mdie_len + 2,
1213 parse.ftie - 2, parse.ftie_len + 2,
1214 parse.rsn - 2, parse.rsn_len + 2,
1215 parse.ric, parse.ric_len,
1216 mic) < 0) {
1217 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1218 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1219 }
1220
1221 if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) {
1222 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1223 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
1224 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
1225 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
1226 ftie->mic, mic_len);
1227 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
1228 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
1229 parse.mdie - 2, parse.mdie_len + 2);
1230 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
1231 parse.ftie - 2, parse.ftie_len + 2);
1232 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
1233 parse.rsn - 2, parse.rsn_len + 2);
1234 return WLAN_STATUS_INVALID_FTIE;
1235 }
1236
1237 return WLAN_STATUS_SUCCESS;
1238 }
1239
1240
wpa_ft_action_rx(struct wpa_state_machine * sm,const u8 * data,size_t len)1241 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1242 {
1243 const u8 *sta_addr, *target_ap;
1244 const u8 *ies;
1245 size_t ies_len;
1246 u8 action;
1247 struct ft_rrb_frame *frame;
1248
1249 if (sm == NULL)
1250 return -1;
1251
1252 /*
1253 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1254 * FT Request action frame body[variable]
1255 */
1256
1257 if (len < 14) {
1258 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1259 "(len=%lu)", (unsigned long) len);
1260 return -1;
1261 }
1262
1263 action = data[1];
1264 sta_addr = data + 2;
1265 target_ap = data + 8;
1266 ies = data + 14;
1267 ies_len = len - 14;
1268
1269 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1270 " Target AP=" MACSTR " Action=%d)",
1271 MAC2STR(sta_addr), MAC2STR(target_ap), action);
1272
1273 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1274 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1275 "STA=" MACSTR " STA-Address=" MACSTR,
1276 MAC2STR(sm->addr), MAC2STR(sta_addr));
1277 return -1;
1278 }
1279
1280 /*
1281 * Do some sanity checking on the target AP address (not own and not
1282 * broadcast. This could be extended to filter based on a list of known
1283 * APs in the MD (if such a list were configured).
1284 */
1285 if ((target_ap[0] & 0x01) ||
1286 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1287 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1288 "frame");
1289 return -1;
1290 }
1291
1292 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1293
1294 if (!sm->wpa_auth->conf.ft_over_ds) {
1295 wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject");
1296 return -1;
1297 }
1298
1299 /* RRB - Forward action frame to the target AP */
1300 frame = os_malloc(sizeof(*frame) + len);
1301 if (frame == NULL)
1302 return -1;
1303 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1304 frame->packet_type = FT_PACKET_REQUEST;
1305 frame->action_length = host_to_le16(len);
1306 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1307 os_memcpy(frame + 1, data, len);
1308
1309 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1310 sizeof(*frame) + len);
1311 os_free(frame);
1312
1313 return 0;
1314 }
1315
1316
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)1317 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
1318 u16 auth_transaction, u16 resp,
1319 const u8 *ies, size_t ies_len)
1320 {
1321 struct wpa_state_machine *sm = ctx;
1322 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
1323 MAC2STR(sm->addr));
1324 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
1325 WLAN_STATUS_SUCCESS, ies, ies_len);
1326 }
1327
1328
wpa_ft_rrb_rx_request(struct wpa_authenticator * wpa_auth,const u8 * current_ap,const u8 * sta_addr,const u8 * body,size_t len)1329 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1330 const u8 *current_ap, const u8 *sta_addr,
1331 const u8 *body, size_t len)
1332 {
1333 struct wpa_state_machine *sm;
1334 u16 status;
1335 u8 *resp_ies;
1336 size_t resp_ies_len;
1337 int res;
1338
1339 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1340 if (sm == NULL) {
1341 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1342 "RRB Request");
1343 return -1;
1344 }
1345
1346 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1347
1348 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
1349 sm->ft_pending_cb_ctx = sm;
1350 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
1351 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1352 &resp_ies_len);
1353 if (res < 0) {
1354 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
1355 return 0;
1356 }
1357 status = res;
1358
1359 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
1360 resp_ies, resp_ies_len);
1361 os_free(resp_ies);
1362 return res;
1363 }
1364
1365
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)1366 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
1367 const u8 *current_ap, const u8 *sta_addr,
1368 u16 status, const u8 *resp_ies,
1369 size_t resp_ies_len)
1370 {
1371 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
1372 size_t rlen;
1373 struct ft_rrb_frame *frame;
1374 u8 *pos;
1375
1376 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1377 " CurrentAP=" MACSTR " status=%d",
1378 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1379 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1380
1381 /* RRB - Forward action frame response to the Current AP */
1382
1383 /*
1384 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1385 * Status_Code[2] FT Request action frame body[variable]
1386 */
1387 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1388
1389 frame = os_malloc(sizeof(*frame) + rlen);
1390 if (frame == NULL)
1391 return -1;
1392 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1393 frame->packet_type = FT_PACKET_RESPONSE;
1394 frame->action_length = host_to_le16(rlen);
1395 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1396 pos = (u8 *) (frame + 1);
1397 *pos++ = WLAN_ACTION_FT;
1398 *pos++ = 2; /* Action: Response */
1399 os_memcpy(pos, sta_addr, ETH_ALEN);
1400 pos += ETH_ALEN;
1401 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1402 pos += ETH_ALEN;
1403 WPA_PUT_LE16(pos, status);
1404 pos += 2;
1405 if (resp_ies)
1406 os_memcpy(pos, resp_ies, resp_ies_len);
1407
1408 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1409 sizeof(*frame) + rlen);
1410 os_free(frame);
1411
1412 return 0;
1413 }
1414
1415
wpa_ft_rrb_rx_pull(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1416 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1417 const u8 *src_addr,
1418 const u8 *data, size_t data_len)
1419 {
1420 struct ft_r0kh_r1kh_pull_frame f;
1421 const u8 *crypt;
1422 u8 *plain;
1423 struct ft_remote_r1kh *r1kh;
1424 struct ft_r0kh_r1kh_resp_frame resp, r;
1425 u8 pmk_r0[PMK_LEN];
1426 int pairwise;
1427
1428 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1429
1430 if (data_len < sizeof(f))
1431 return -1;
1432
1433 r1kh = wpa_auth->conf.r1kh_list;
1434 while (r1kh) {
1435 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1436 break;
1437 r1kh = r1kh->next;
1438 }
1439 if (r1kh == NULL) {
1440 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1441 "PMK-R1 pull source address " MACSTR,
1442 MAC2STR(src_addr));
1443 return -1;
1444 }
1445
1446 crypt = data + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1447 os_memset(&f, 0, sizeof(f));
1448 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1449 /* aes_unwrap() does not support inplace decryption, so use a temporary
1450 * buffer for the data. */
1451 if (aes_unwrap(r1kh->key, sizeof(r1kh->key),
1452 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1453 crypt, plain) < 0) {
1454 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1455 "request from " MACSTR, MAC2STR(src_addr));
1456 return -1;
1457 }
1458
1459 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1460 f.nonce, sizeof(f.nonce));
1461 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1462 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1463 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1464 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1465
1466 os_memset(&resp, 0, sizeof(resp));
1467 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1468 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1469 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1470 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1471
1472 /* aes_wrap() does not support inplace encryption, so use a temporary
1473 * buffer for the data. */
1474 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1475 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1476 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1477 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1478 &pairwise) < 0) {
1479 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1480 "PMK-R1 pull");
1481 return -1;
1482 }
1483
1484 if (wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1485 r.pmk_r1, r.pmk_r1_name) < 0) {
1486 os_memset(pmk_r0, 0, PMK_LEN);
1487 return -1;
1488 }
1489 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1490 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1491 WPA_PMK_NAME_LEN);
1492 r.pairwise = host_to_le16(pairwise);
1493 os_memset(r.pad, 0, sizeof(r.pad));
1494
1495 if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1496 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1497 r.nonce, resp.nonce) < 0) {
1498 os_memset(pmk_r0, 0, PMK_LEN);
1499 return -1;
1500 }
1501
1502 os_memset(pmk_r0, 0, PMK_LEN);
1503
1504 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1505
1506 return 0;
1507 }
1508
1509
ft_pull_resp_cb_finish(void * eloop_ctx,void * timeout_ctx)1510 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx)
1511 {
1512 struct wpa_state_machine *sm = eloop_ctx;
1513 int res;
1514 u8 *resp_ies;
1515 size_t resp_ies_len;
1516 u16 status;
1517
1518 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
1519 wpabuf_len(sm->ft_pending_req_ies),
1520 &resp_ies, &resp_ies_len);
1521 wpabuf_free(sm->ft_pending_req_ies);
1522 sm->ft_pending_req_ies = NULL;
1523 if (res < 0)
1524 res = WLAN_STATUS_UNSPECIFIED_FAILURE;
1525 status = res;
1526 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
1527 " - status %u", MAC2STR(sm->addr), status);
1528
1529 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
1530 sm->ft_pending_auth_transaction + 1, status,
1531 resp_ies, resp_ies_len);
1532 os_free(resp_ies);
1533 }
1534
1535
ft_pull_resp_cb(struct wpa_state_machine * sm,void * ctx)1536 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx)
1537 {
1538 struct ft_r0kh_r1kh_resp_frame *frame = ctx;
1539
1540 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0 ||
1541 os_memcmp(frame->nonce, sm->ft_pending_pull_nonce,
1542 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0 ||
1543 sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
1544 return 0;
1545
1546 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for "
1547 MACSTR " - process from timeout", MAC2STR(sm->addr));
1548 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL);
1549 return 1;
1550 }
1551
1552
wpa_ft_rrb_rx_resp(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1553 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1554 const u8 *src_addr,
1555 const u8 *data, size_t data_len)
1556 {
1557 struct ft_r0kh_r1kh_resp_frame f;
1558 const u8 *crypt;
1559 u8 *plain;
1560 struct ft_remote_r0kh *r0kh;
1561 int pairwise, res;
1562
1563 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1564
1565 if (data_len < sizeof(f))
1566 return -1;
1567
1568 r0kh = wpa_auth->conf.r0kh_list;
1569 while (r0kh) {
1570 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1571 break;
1572 r0kh = r0kh->next;
1573 }
1574 if (r0kh == NULL) {
1575 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1576 "PMK-R0 pull response source address " MACSTR,
1577 MAC2STR(src_addr));
1578 return -1;
1579 }
1580
1581 crypt = data + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1582 os_memset(&f, 0, sizeof(f));
1583 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1584 /* aes_unwrap() does not support inplace decryption, so use a temporary
1585 * buffer for the data. */
1586 if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1587 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1588 crypt, plain) < 0) {
1589 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1590 "response from " MACSTR, MAC2STR(src_addr));
1591 return -1;
1592 }
1593
1594 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1595 FT_R1KH_ID_LEN) != 0) {
1596 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1597 "matching R1KH-ID");
1598 return -1;
1599 }
1600
1601 pairwise = le_to_host16(f.pairwise);
1602 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1603 f.nonce, sizeof(f.nonce));
1604 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1605 MACSTR " pairwise=0x%x",
1606 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1607 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1608 f.pmk_r1, PMK_LEN);
1609 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1610 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1611
1612 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1613 pairwise);
1614 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request");
1615 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f);
1616 os_memset(f.pmk_r1, 0, PMK_LEN);
1617
1618 return res ? 0 : -1;
1619 }
1620
1621
wpa_ft_rrb_rx_push(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1622 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1623 const u8 *src_addr,
1624 const u8 *data, size_t data_len)
1625 {
1626 struct ft_r0kh_r1kh_push_frame f;
1627 const u8 *crypt;
1628 u8 *plain;
1629 struct ft_remote_r0kh *r0kh;
1630 struct os_time now;
1631 os_time_t tsend;
1632 int pairwise;
1633
1634 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1635
1636 if (data_len < sizeof(f))
1637 return -1;
1638
1639 r0kh = wpa_auth->conf.r0kh_list;
1640 while (r0kh) {
1641 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1642 break;
1643 r0kh = r0kh->next;
1644 }
1645 if (r0kh == NULL) {
1646 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1647 "PMK-R0 push source address " MACSTR,
1648 MAC2STR(src_addr));
1649 return -1;
1650 }
1651
1652 crypt = data + offsetof(struct ft_r0kh_r1kh_push_frame, timestamp);
1653 os_memset(&f, 0, sizeof(f));
1654 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1655 timestamp);
1656 /* aes_unwrap() does not support inplace decryption, so use a temporary
1657 * buffer for the data. */
1658 if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1659 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1660 crypt, plain) < 0) {
1661 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1662 MACSTR, MAC2STR(src_addr));
1663 return -1;
1664 }
1665
1666 os_get_time(&now);
1667 tsend = WPA_GET_LE32(f.timestamp);
1668 if ((now.sec > tsend && now.sec - tsend > 60) ||
1669 (now.sec < tsend && tsend - now.sec > 60)) {
1670 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1671 "timestamp: sender time %d own time %d\n",
1672 (int) tsend, (int) now.sec);
1673 return -1;
1674 }
1675
1676 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1677 FT_R1KH_ID_LEN) != 0) {
1678 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1679 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1680 MAC2STR(f.r1kh_id),
1681 MAC2STR(wpa_auth->conf.r1_key_holder));
1682 return -1;
1683 }
1684
1685 pairwise = le_to_host16(f.pairwise);
1686 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1687 MACSTR " pairwise=0x%x",
1688 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1689 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1690 f.pmk_r1, PMK_LEN);
1691 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1692 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1693
1694 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1695 pairwise);
1696 os_memset(f.pmk_r1, 0, PMK_LEN);
1697
1698 return 0;
1699 }
1700
1701
wpa_ft_rrb_rx(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1702 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1703 const u8 *data, size_t data_len)
1704 {
1705 struct ft_rrb_frame *frame;
1706 u16 alen;
1707 const u8 *pos, *end, *start;
1708 u8 action;
1709 const u8 *sta_addr, *target_ap_addr;
1710
1711 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1712 MAC2STR(src_addr));
1713
1714 if (data_len < sizeof(*frame)) {
1715 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1716 (unsigned long) data_len);
1717 return -1;
1718 }
1719
1720 pos = data;
1721 frame = (struct ft_rrb_frame *) pos;
1722 pos += sizeof(*frame);
1723
1724 alen = le_to_host16(frame->action_length);
1725 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1726 "action_length=%d ap_address=" MACSTR,
1727 frame->frame_type, frame->packet_type, alen,
1728 MAC2STR(frame->ap_address));
1729
1730 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1731 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1732 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1733 "unrecognized type %d", frame->frame_type);
1734 return -1;
1735 }
1736
1737 if (alen > data_len - sizeof(*frame)) {
1738 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1739 "frame");
1740 return -1;
1741 }
1742
1743 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1744 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1745 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1746 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1747 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1748 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1749
1750 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1751
1752 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1753 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1754 "room for Action Frame body); alen=%lu",
1755 (unsigned long) alen);
1756 return -1;
1757 }
1758 start = pos;
1759 end = pos + alen;
1760
1761 if (*pos != WLAN_ACTION_FT) {
1762 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1763 "%d", *pos);
1764 return -1;
1765 }
1766
1767 pos++;
1768 action = *pos++;
1769 sta_addr = pos;
1770 pos += ETH_ALEN;
1771 target_ap_addr = pos;
1772 pos += ETH_ALEN;
1773 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1774 MACSTR " target_ap_addr=" MACSTR,
1775 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1776
1777 if (frame->packet_type == FT_PACKET_REQUEST) {
1778 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1779
1780 if (action != 1) {
1781 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1782 "RRB Request", action);
1783 return -1;
1784 }
1785
1786 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1787 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1788 "RRB Request does not match with own "
1789 "address");
1790 return -1;
1791 }
1792
1793 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1794 sta_addr, pos, end - pos) < 0)
1795 return -1;
1796 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1797 u16 status_code;
1798
1799 if (end - pos < 2) {
1800 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1801 "code in RRB Response");
1802 return -1;
1803 }
1804 status_code = WPA_GET_LE16(pos);
1805 pos += 2;
1806
1807 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1808 "(status_code=%d)", status_code);
1809
1810 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1811 return -1;
1812 } else {
1813 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1814 "packet_type %d", frame->packet_type);
1815 return -1;
1816 }
1817
1818 if (end > pos) {
1819 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
1820 pos, end - pos);
1821 }
1822
1823 return 0;
1824 }
1825
1826
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)1827 static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1828 struct wpa_ft_pmk_r0_sa *pmk_r0,
1829 struct ft_remote_r1kh *r1kh,
1830 const u8 *s1kh_id, int pairwise)
1831 {
1832 struct ft_r0kh_r1kh_push_frame frame, f;
1833 struct os_time now;
1834 const u8 *plain;
1835 u8 *crypt;
1836
1837 os_memset(&frame, 0, sizeof(frame));
1838 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1839 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1840 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1841 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1842
1843 /* aes_wrap() does not support inplace encryption, so use a temporary
1844 * buffer for the data. */
1845 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1846 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1847 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1848 if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1849 s1kh_id, f.pmk_r1, f.pmk_r1_name) < 0)
1850 return -1;
1851 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1852 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1853 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1854 WPA_PMK_NAME_LEN);
1855 os_get_time(&now);
1856 WPA_PUT_LE32(f.timestamp, now.sec);
1857 f.pairwise = host_to_le16(pairwise);
1858 os_memset(f.pad, 0, sizeof(f.pad));
1859 plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1860 timestamp);
1861 crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame,
1862 timestamp);
1863 if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1864 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1865 plain, crypt) < 0)
1866 return -1;
1867
1868 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1869 return 0;
1870 }
1871
1872
wpa_ft_push_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * addr)1873 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1874 {
1875 struct wpa_ft_pmk_r0_sa *r0;
1876 struct ft_remote_r1kh *r1kh;
1877
1878 if (!wpa_auth->conf.pmk_r1_push)
1879 return;
1880
1881 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1882 while (r0) {
1883 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1884 break;
1885 r0 = r0->next;
1886 }
1887
1888 if (r0 == NULL || r0->pmk_r1_pushed)
1889 return;
1890 r0->pmk_r1_pushed = 1;
1891
1892 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1893 "for STA " MACSTR, MAC2STR(addr));
1894
1895 r1kh = wpa_auth->conf.r1kh_list;
1896 while (r1kh) {
1897 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1898 r1kh = r1kh->next;
1899 }
1900 }
1901
1902 #endif /* CONFIG_IEEE80211R_AP */
1903