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 if (sm->tk_already_set) {
801 /* Must avoid TK reconfiguration to prevent clearing of TX/RX
802 * PN in the driver */
803 wpa_printf(MSG_DEBUG,
804 "FT: Do not re-install same PTK to the driver");
805 return;
806 }
807
808 /* FIX: add STA entry to kernel/driver here? The set_key will fail
809 * most likely without this.. At the moment, STA entry is added only
810 * after association has been completed. This function will be called
811 * again after association to get the PTK configured, but that could be
812 * optimized by adding the STA entry earlier.
813 */
814 if (wpa_auth_set_key(sm->wpa_auth, 0, alg, sm->addr, 0,
815 sm->PTK.tk, klen))
816 return;
817
818 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
819 sm->pairwise_set = TRUE;
820 sm->tk_already_set = TRUE;
821 }
822
823
824 /* 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)825 static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
826 const u8 *req_pmk_r1_name,
827 u8 *out_pmk_r1, int *out_pairwise)
828 {
829 const u8 *pmk = NULL;
830 u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
831 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
832 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
833 const u8 *mdid = wpa_auth->conf.mobility_domain;
834 const u8 *r0kh = sm->r0kh_id;
835 size_t r0kh_len = sm->r0kh_id_len;
836 const u8 *r1kh = wpa_auth->conf.r1_key_holder;
837 const u8 *ssid = wpa_auth->conf.ssid;
838 size_t ssid_len = wpa_auth->conf.ssid_len;
839 int pairwise;
840
841 pairwise = sm->pairwise;
842
843 for (;;) {
844 pmk = wpa_ft_get_psk(wpa_auth, sm->addr, sm->p2p_dev_addr,
845 pmk);
846 if (pmk == NULL)
847 break;
848
849 if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
850 r0kh_len, sm->addr,
851 pmk_r0, pmk_r0_name) < 0 ||
852 wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
853 pmk_r1, pmk_r1_name) < 0 ||
854 os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
855 WPA_PMK_NAME_LEN) != 0)
856 continue;
857
858 /* We found a PSK that matches the requested pmk_r1_name */
859 wpa_printf(MSG_DEBUG,
860 "FT: Found PSK to generate PMK-R1 locally");
861 os_memcpy(out_pmk_r1, pmk_r1, PMK_LEN);
862 if (out_pairwise)
863 *out_pairwise = pairwise;
864 return 0;
865 }
866
867 wpa_printf(MSG_DEBUG,
868 "FT: Did not find PSK to generate PMK-R1 locally");
869 return -1;
870 }
871
872
873 /* Detect the configuration the station asked for.
874 * Required to detect FT-PSK and pairwise cipher.
875 */
wpa_ft_set_key_mgmt(struct wpa_state_machine * sm,struct wpa_ft_ies * parse)876 static int wpa_ft_set_key_mgmt(struct wpa_state_machine *sm,
877 struct wpa_ft_ies *parse)
878 {
879 int key_mgmt, ciphers;
880
881 if (sm->wpa_key_mgmt)
882 return 0;
883
884 key_mgmt = parse->key_mgmt & sm->wpa_auth->conf.wpa_key_mgmt;
885 if (!key_mgmt) {
886 wpa_printf(MSG_DEBUG, "FT: Invalid key mgmt (0x%x) from "
887 MACSTR, parse->key_mgmt, MAC2STR(sm->addr));
888 return -1;
889 }
890 if (key_mgmt & WPA_KEY_MGMT_FT_IEEE8021X)
891 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_IEEE8021X;
892 else if (key_mgmt & WPA_KEY_MGMT_FT_PSK)
893 sm->wpa_key_mgmt = WPA_KEY_MGMT_FT_PSK;
894 ciphers = parse->pairwise_cipher & sm->wpa_auth->conf.rsn_pairwise;
895 if (!ciphers) {
896 wpa_printf(MSG_DEBUG, "FT: Invalid pairwise cipher (0x%x) from "
897 MACSTR,
898 parse->pairwise_cipher, MAC2STR(sm->addr));
899 return -1;
900 }
901 sm->pairwise = wpa_pick_pairwise_cipher(ciphers, 0);
902
903 return 0;
904 }
905
906
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)907 static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
908 const u8 *ies, size_t ies_len,
909 u8 **resp_ies, size_t *resp_ies_len)
910 {
911 struct rsn_mdie *mdie;
912 struct rsn_ftie *ftie;
913 u8 pmk_r1[PMK_LEN], pmk_r1_name[WPA_PMK_NAME_LEN];
914 u8 ptk_name[WPA_PMK_NAME_LEN];
915 struct wpa_auth_config *conf;
916 struct wpa_ft_ies parse;
917 size_t buflen;
918 int ret;
919 u8 *pos, *end;
920 int pairwise;
921
922 *resp_ies = NULL;
923 *resp_ies_len = 0;
924
925 sm->pmk_r1_name_valid = 0;
926 conf = &sm->wpa_auth->conf;
927
928 wpa_hexdump(MSG_DEBUG, "FT: Received authentication frame IEs",
929 ies, ies_len);
930
931 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
932 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
933 return WLAN_STATUS_UNSPECIFIED_FAILURE;
934 }
935
936 mdie = (struct rsn_mdie *) parse.mdie;
937 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
938 os_memcmp(mdie->mobility_domain,
939 sm->wpa_auth->conf.mobility_domain,
940 MOBILITY_DOMAIN_ID_LEN) != 0) {
941 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
942 return WLAN_STATUS_INVALID_MDIE;
943 }
944
945 ftie = (struct rsn_ftie *) parse.ftie;
946 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
947 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
948 return WLAN_STATUS_INVALID_FTIE;
949 }
950
951 os_memcpy(sm->SNonce, ftie->snonce, WPA_NONCE_LEN);
952
953 if (parse.r0kh_id == NULL) {
954 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE - no R0KH-ID");
955 return WLAN_STATUS_INVALID_FTIE;
956 }
957
958 wpa_hexdump(MSG_DEBUG, "FT: STA R0KH-ID",
959 parse.r0kh_id, parse.r0kh_id_len);
960 os_memcpy(sm->r0kh_id, parse.r0kh_id, parse.r0kh_id_len);
961 sm->r0kh_id_len = parse.r0kh_id_len;
962
963 if (parse.rsn_pmkid == NULL) {
964 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
965 return WLAN_STATUS_INVALID_PMKID;
966 }
967
968 if (wpa_ft_set_key_mgmt(sm, &parse) < 0)
969 return WLAN_STATUS_UNSPECIFIED_FAILURE;
970
971 wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
972 parse.rsn_pmkid, WPA_PMK_NAME_LEN);
973 if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
974 sm->wpa_auth->conf.r1_key_holder, sm->addr,
975 pmk_r1_name) < 0)
976 return WLAN_STATUS_UNSPECIFIED_FAILURE;
977 wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
978 pmk_r1_name, WPA_PMK_NAME_LEN);
979
980 if (conf->ft_psk_generate_local &&
981 wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt)) {
982 if (wpa_ft_psk_pmk_r1(sm, pmk_r1_name, pmk_r1, &pairwise) < 0)
983 return WLAN_STATUS_INVALID_PMKID;
984 } else if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name,
985 pmk_r1, &pairwise) < 0) {
986 if (wpa_ft_pull_pmk_r1(sm, ies, ies_len, parse.rsn_pmkid) < 0) {
987 wpa_printf(MSG_DEBUG, "FT: Did not have matching "
988 "PMK-R1 and unknown R0KH-ID");
989 return WLAN_STATUS_INVALID_PMKID;
990 }
991
992 return -1; /* Status pending */
993 }
994
995 wpa_hexdump_key(MSG_DEBUG, "FT: Selected PMK-R1", pmk_r1, PMK_LEN);
996 sm->pmk_r1_name_valid = 1;
997 os_memcpy(sm->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
998
999 if (random_get_bytes(sm->ANonce, WPA_NONCE_LEN)) {
1000 wpa_printf(MSG_DEBUG, "FT: Failed to get random data for "
1001 "ANonce");
1002 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1003 }
1004
1005 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1006 sm->SNonce, WPA_NONCE_LEN);
1007 wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
1008 sm->ANonce, WPA_NONCE_LEN);
1009
1010 if (wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
1011 sm->wpa_auth->addr, pmk_r1_name,
1012 &sm->PTK, ptk_name, sm->wpa_key_mgmt,
1013 pairwise) < 0)
1014 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1015
1016 sm->pairwise = pairwise;
1017 sm->PTK_valid = TRUE;
1018 sm->tk_already_set = FALSE;
1019 wpa_ft_install_ptk(sm);
1020
1021 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
1022 2 + FT_R1KH_ID_LEN + 200;
1023 *resp_ies = os_zalloc(buflen);
1024 if (*resp_ies == NULL)
1025 goto fail;
1026
1027 pos = *resp_ies;
1028 end = *resp_ies + buflen;
1029
1030 ret = wpa_write_rsn_ie(conf, pos, end - pos, parse.rsn_pmkid);
1031 if (ret < 0)
1032 goto fail;
1033 pos += ret;
1034
1035 ret = wpa_write_mdie(conf, pos, end - pos);
1036 if (ret < 0)
1037 goto fail;
1038 pos += ret;
1039
1040 ret = wpa_write_ftie(conf, parse.r0kh_id, parse.r0kh_id_len,
1041 sm->ANonce, sm->SNonce, pos, end - pos, NULL, 0);
1042 if (ret < 0)
1043 goto fail;
1044 pos += ret;
1045
1046 *resp_ies_len = pos - *resp_ies;
1047
1048 return WLAN_STATUS_SUCCESS;
1049 fail:
1050 os_free(*resp_ies);
1051 *resp_ies = NULL;
1052 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1053 }
1054
1055
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)1056 void wpa_ft_process_auth(struct wpa_state_machine *sm, const u8 *bssid,
1057 u16 auth_transaction, const u8 *ies, size_t ies_len,
1058 void (*cb)(void *ctx, const u8 *dst, const u8 *bssid,
1059 u16 auth_transaction, u16 status,
1060 const u8 *ies, size_t ies_len),
1061 void *ctx)
1062 {
1063 u16 status;
1064 u8 *resp_ies;
1065 size_t resp_ies_len;
1066 int res;
1067
1068 if (sm == NULL) {
1069 wpa_printf(MSG_DEBUG, "FT: Received authentication frame, but "
1070 "WPA SM not available");
1071 return;
1072 }
1073
1074 wpa_printf(MSG_DEBUG, "FT: Received authentication frame: STA=" MACSTR
1075 " BSSID=" MACSTR " transaction=%d",
1076 MAC2STR(sm->addr), MAC2STR(bssid), auth_transaction);
1077 sm->ft_pending_cb = cb;
1078 sm->ft_pending_cb_ctx = ctx;
1079 sm->ft_pending_auth_transaction = auth_transaction;
1080 res = wpa_ft_process_auth_req(sm, ies, ies_len, &resp_ies,
1081 &resp_ies_len);
1082 if (res < 0) {
1083 wpa_printf(MSG_DEBUG, "FT: Callback postponed until response is available");
1084 return;
1085 }
1086 status = res;
1087
1088 wpa_printf(MSG_DEBUG, "FT: FT authentication response: dst=" MACSTR
1089 " auth_transaction=%d status=%d",
1090 MAC2STR(sm->addr), auth_transaction + 1, status);
1091 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1092 cb(ctx, sm->addr, bssid, auth_transaction + 1, status,
1093 resp_ies, resp_ies_len);
1094 os_free(resp_ies);
1095 }
1096
1097
wpa_ft_validate_reassoc(struct wpa_state_machine * sm,const u8 * ies,size_t ies_len)1098 u16 wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
1099 size_t ies_len)
1100 {
1101 struct wpa_ft_ies parse;
1102 struct rsn_mdie *mdie;
1103 struct rsn_ftie *ftie;
1104 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
1105 size_t mic_len = 16;
1106 unsigned int count;
1107
1108 if (sm == NULL)
1109 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1110
1111 wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
1112
1113 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
1114 wpa_printf(MSG_DEBUG, "FT: Failed to parse FT IEs");
1115 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1116 }
1117
1118 if (parse.rsn == NULL) {
1119 wpa_printf(MSG_DEBUG, "FT: No RSNIE in Reassoc Req");
1120 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1121 }
1122
1123 if (parse.rsn_pmkid == NULL) {
1124 wpa_printf(MSG_DEBUG, "FT: No PMKID in RSNIE");
1125 return WLAN_STATUS_INVALID_PMKID;
1126 }
1127
1128 if (os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)
1129 != 0) {
1130 wpa_printf(MSG_DEBUG, "FT: PMKID in Reassoc Req did not match "
1131 "with the PMKR1Name derived from auth request");
1132 return WLAN_STATUS_INVALID_PMKID;
1133 }
1134
1135 mdie = (struct rsn_mdie *) parse.mdie;
1136 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
1137 os_memcmp(mdie->mobility_domain,
1138 sm->wpa_auth->conf.mobility_domain,
1139 MOBILITY_DOMAIN_ID_LEN) != 0) {
1140 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
1141 return WLAN_STATUS_INVALID_MDIE;
1142 }
1143
1144 ftie = (struct rsn_ftie *) parse.ftie;
1145 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
1146 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
1147 return WLAN_STATUS_INVALID_FTIE;
1148 }
1149
1150 if (os_memcmp(ftie->snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
1151 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
1152 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
1153 ftie->snonce, WPA_NONCE_LEN);
1154 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
1155 sm->SNonce, WPA_NONCE_LEN);
1156 return WLAN_STATUS_INVALID_FTIE;
1157 }
1158
1159 if (os_memcmp(ftie->anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
1160 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
1161 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
1162 ftie->anonce, WPA_NONCE_LEN);
1163 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
1164 sm->ANonce, WPA_NONCE_LEN);
1165 return WLAN_STATUS_INVALID_FTIE;
1166 }
1167
1168
1169 if (parse.r0kh_id == NULL) {
1170 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
1171 return WLAN_STATUS_INVALID_FTIE;
1172 }
1173
1174 if (parse.r0kh_id_len != sm->r0kh_id_len ||
1175 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
1176 {
1177 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
1178 "the current R0KH-ID");
1179 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
1180 parse.r0kh_id, parse.r0kh_id_len);
1181 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
1182 sm->r0kh_id, sm->r0kh_id_len);
1183 return WLAN_STATUS_INVALID_FTIE;
1184 }
1185
1186 if (parse.r1kh_id == NULL) {
1187 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
1188 return WLAN_STATUS_INVALID_FTIE;
1189 }
1190
1191 if (os_memcmp_const(parse.r1kh_id, sm->wpa_auth->conf.r1_key_holder,
1192 FT_R1KH_ID_LEN) != 0) {
1193 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
1194 "ReassocReq");
1195 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID in FTIE",
1196 parse.r1kh_id, FT_R1KH_ID_LEN);
1197 wpa_hexdump(MSG_DEBUG, "FT: Expected R1KH-ID",
1198 sm->wpa_auth->conf.r1_key_holder, FT_R1KH_ID_LEN);
1199 return WLAN_STATUS_INVALID_FTIE;
1200 }
1201
1202 if (parse.rsn_pmkid == NULL ||
1203 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
1204 {
1205 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
1206 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
1207 return WLAN_STATUS_INVALID_PMKID;
1208 }
1209
1210 count = 3;
1211 if (parse.ric)
1212 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
1213 if (ftie->mic_control[1] != count) {
1214 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
1215 "Control: received %u expected %u",
1216 ftie->mic_control[1], count);
1217 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1218 }
1219
1220 if (wpa_ft_mic(sm->PTK.kck, sm->PTK.kck_len, sm->addr,
1221 sm->wpa_auth->addr, 5,
1222 parse.mdie - 2, parse.mdie_len + 2,
1223 parse.ftie - 2, parse.ftie_len + 2,
1224 parse.rsn - 2, parse.rsn_len + 2,
1225 parse.ric, parse.ric_len,
1226 mic) < 0) {
1227 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
1228 return WLAN_STATUS_UNSPECIFIED_FAILURE;
1229 }
1230
1231 if (os_memcmp_const(mic, ftie->mic, mic_len) != 0) {
1232 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
1233 wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
1234 MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
1235 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
1236 ftie->mic, mic_len);
1237 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
1238 wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
1239 parse.mdie - 2, parse.mdie_len + 2);
1240 wpa_hexdump(MSG_MSGDUMP, "FT: FTIE",
1241 parse.ftie - 2, parse.ftie_len + 2);
1242 wpa_hexdump(MSG_MSGDUMP, "FT: RSN",
1243 parse.rsn - 2, parse.rsn_len + 2);
1244 return WLAN_STATUS_INVALID_FTIE;
1245 }
1246
1247 return WLAN_STATUS_SUCCESS;
1248 }
1249
1250
wpa_ft_action_rx(struct wpa_state_machine * sm,const u8 * data,size_t len)1251 int wpa_ft_action_rx(struct wpa_state_machine *sm, const u8 *data, size_t len)
1252 {
1253 const u8 *sta_addr, *target_ap;
1254 const u8 *ies;
1255 size_t ies_len;
1256 u8 action;
1257 struct ft_rrb_frame *frame;
1258
1259 if (sm == NULL)
1260 return -1;
1261
1262 /*
1263 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1264 * FT Request action frame body[variable]
1265 */
1266
1267 if (len < 14) {
1268 wpa_printf(MSG_DEBUG, "FT: Too short FT Action frame "
1269 "(len=%lu)", (unsigned long) len);
1270 return -1;
1271 }
1272
1273 action = data[1];
1274 sta_addr = data + 2;
1275 target_ap = data + 8;
1276 ies = data + 14;
1277 ies_len = len - 14;
1278
1279 wpa_printf(MSG_DEBUG, "FT: Received FT Action frame (STA=" MACSTR
1280 " Target AP=" MACSTR " Action=%d)",
1281 MAC2STR(sta_addr), MAC2STR(target_ap), action);
1282
1283 if (os_memcmp(sta_addr, sm->addr, ETH_ALEN) != 0) {
1284 wpa_printf(MSG_DEBUG, "FT: Mismatch in FT Action STA address: "
1285 "STA=" MACSTR " STA-Address=" MACSTR,
1286 MAC2STR(sm->addr), MAC2STR(sta_addr));
1287 return -1;
1288 }
1289
1290 /*
1291 * Do some sanity checking on the target AP address (not own and not
1292 * broadcast. This could be extended to filter based on a list of known
1293 * APs in the MD (if such a list were configured).
1294 */
1295 if ((target_ap[0] & 0x01) ||
1296 os_memcmp(target_ap, sm->wpa_auth->addr, ETH_ALEN) == 0) {
1297 wpa_printf(MSG_DEBUG, "FT: Invalid Target AP in FT Action "
1298 "frame");
1299 return -1;
1300 }
1301
1302 wpa_hexdump(MSG_MSGDUMP, "FT: Action frame body", ies, ies_len);
1303
1304 if (!sm->wpa_auth->conf.ft_over_ds) {
1305 wpa_printf(MSG_DEBUG, "FT: Over-DS option disabled - reject");
1306 return -1;
1307 }
1308
1309 /* RRB - Forward action frame to the target AP */
1310 frame = os_malloc(sizeof(*frame) + len);
1311 if (frame == NULL)
1312 return -1;
1313 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1314 frame->packet_type = FT_PACKET_REQUEST;
1315 frame->action_length = host_to_le16(len);
1316 os_memcpy(frame->ap_address, sm->wpa_auth->addr, ETH_ALEN);
1317 os_memcpy(frame + 1, data, len);
1318
1319 wpa_ft_rrb_send(sm->wpa_auth, target_ap, (u8 *) frame,
1320 sizeof(*frame) + len);
1321 os_free(frame);
1322
1323 return 0;
1324 }
1325
1326
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)1327 static void wpa_ft_rrb_rx_request_cb(void *ctx, const u8 *dst, const u8 *bssid,
1328 u16 auth_transaction, u16 resp,
1329 const u8 *ies, size_t ies_len)
1330 {
1331 struct wpa_state_machine *sm = ctx;
1332 wpa_printf(MSG_DEBUG, "FT: Over-the-DS RX request cb for " MACSTR,
1333 MAC2STR(sm->addr));
1334 wpa_ft_send_rrb_auth_resp(sm, sm->ft_pending_current_ap, sm->addr,
1335 WLAN_STATUS_SUCCESS, ies, ies_len);
1336 }
1337
1338
wpa_ft_rrb_rx_request(struct wpa_authenticator * wpa_auth,const u8 * current_ap,const u8 * sta_addr,const u8 * body,size_t len)1339 static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
1340 const u8 *current_ap, const u8 *sta_addr,
1341 const u8 *body, size_t len)
1342 {
1343 struct wpa_state_machine *sm;
1344 u16 status;
1345 u8 *resp_ies;
1346 size_t resp_ies_len;
1347 int res;
1348
1349 sm = wpa_ft_add_sta(wpa_auth, sta_addr);
1350 if (sm == NULL) {
1351 wpa_printf(MSG_DEBUG, "FT: Failed to add new STA based on "
1352 "RRB Request");
1353 return -1;
1354 }
1355
1356 wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);
1357
1358 sm->ft_pending_cb = wpa_ft_rrb_rx_request_cb;
1359 sm->ft_pending_cb_ctx = sm;
1360 os_memcpy(sm->ft_pending_current_ap, current_ap, ETH_ALEN);
1361 res = wpa_ft_process_auth_req(sm, body, len, &resp_ies,
1362 &resp_ies_len);
1363 if (res < 0) {
1364 wpa_printf(MSG_DEBUG, "FT: No immediate response available - wait for pull response");
1365 return 0;
1366 }
1367 status = res;
1368
1369 res = wpa_ft_send_rrb_auth_resp(sm, current_ap, sta_addr, status,
1370 resp_ies, resp_ies_len);
1371 os_free(resp_ies);
1372 return res;
1373 }
1374
1375
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)1376 static int wpa_ft_send_rrb_auth_resp(struct wpa_state_machine *sm,
1377 const u8 *current_ap, const u8 *sta_addr,
1378 u16 status, const u8 *resp_ies,
1379 size_t resp_ies_len)
1380 {
1381 struct wpa_authenticator *wpa_auth = sm->wpa_auth;
1382 size_t rlen;
1383 struct ft_rrb_frame *frame;
1384 u8 *pos;
1385
1386 wpa_printf(MSG_DEBUG, "FT: RRB authentication response: STA=" MACSTR
1387 " CurrentAP=" MACSTR " status=%d",
1388 MAC2STR(sm->addr), MAC2STR(current_ap), status);
1389 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", resp_ies, resp_ies_len);
1390
1391 /* RRB - Forward action frame response to the Current AP */
1392
1393 /*
1394 * data: Category[1] Action[1] STA_Address[6] Target_AP_Address[6]
1395 * Status_Code[2] FT Request action frame body[variable]
1396 */
1397 rlen = 2 + 2 * ETH_ALEN + 2 + resp_ies_len;
1398
1399 frame = os_malloc(sizeof(*frame) + rlen);
1400 if (frame == NULL)
1401 return -1;
1402 frame->frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1403 frame->packet_type = FT_PACKET_RESPONSE;
1404 frame->action_length = host_to_le16(rlen);
1405 os_memcpy(frame->ap_address, wpa_auth->addr, ETH_ALEN);
1406 pos = (u8 *) (frame + 1);
1407 *pos++ = WLAN_ACTION_FT;
1408 *pos++ = 2; /* Action: Response */
1409 os_memcpy(pos, sta_addr, ETH_ALEN);
1410 pos += ETH_ALEN;
1411 os_memcpy(pos, wpa_auth->addr, ETH_ALEN);
1412 pos += ETH_ALEN;
1413 WPA_PUT_LE16(pos, status);
1414 pos += 2;
1415 if (resp_ies)
1416 os_memcpy(pos, resp_ies, resp_ies_len);
1417
1418 wpa_ft_rrb_send(wpa_auth, current_ap, (u8 *) frame,
1419 sizeof(*frame) + rlen);
1420 os_free(frame);
1421
1422 return 0;
1423 }
1424
1425
wpa_ft_rrb_rx_pull(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1426 static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
1427 const u8 *src_addr,
1428 const u8 *data, size_t data_len)
1429 {
1430 struct ft_r0kh_r1kh_pull_frame f;
1431 const u8 *crypt;
1432 u8 *plain;
1433 struct ft_remote_r1kh *r1kh;
1434 struct ft_r0kh_r1kh_resp_frame resp, r;
1435 u8 pmk_r0[PMK_LEN];
1436 int pairwise;
1437
1438 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
1439
1440 if (data_len < sizeof(f))
1441 return -1;
1442
1443 r1kh = wpa_auth->conf.r1kh_list;
1444 while (r1kh) {
1445 if (os_memcmp(r1kh->addr, src_addr, ETH_ALEN) == 0)
1446 break;
1447 r1kh = r1kh->next;
1448 }
1449 if (r1kh == NULL) {
1450 wpa_printf(MSG_DEBUG, "FT: No matching R1KH address found for "
1451 "PMK-R1 pull source address " MACSTR,
1452 MAC2STR(src_addr));
1453 return -1;
1454 }
1455
1456 crypt = data + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1457 os_memset(&f, 0, sizeof(f));
1458 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_pull_frame, nonce);
1459 /* aes_unwrap() does not support inplace decryption, so use a temporary
1460 * buffer for the data. */
1461 if (aes_unwrap(r1kh->key, sizeof(r1kh->key),
1462 (FT_R0KH_R1KH_PULL_DATA_LEN + 7) / 8,
1463 crypt, plain) < 0) {
1464 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1465 "request from " MACSTR, MAC2STR(src_addr));
1466 return -1;
1467 }
1468
1469 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1470 f.nonce, sizeof(f.nonce));
1471 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR0Name",
1472 f.pmk_r0_name, WPA_PMK_NAME_LEN);
1473 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1474 MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
1475
1476 os_memset(&resp, 0, sizeof(resp));
1477 resp.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1478 resp.packet_type = FT_PACKET_R0KH_R1KH_RESP;
1479 resp.data_length = host_to_le16(FT_R0KH_R1KH_RESP_DATA_LEN);
1480 os_memcpy(resp.ap_address, wpa_auth->addr, ETH_ALEN);
1481
1482 /* aes_wrap() does not support inplace encryption, so use a temporary
1483 * buffer for the data. */
1484 os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
1485 os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
1486 os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
1487 if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
1488 &pairwise) < 0) {
1489 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
1490 "PMK-R1 pull");
1491 return -1;
1492 }
1493
1494 if (wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
1495 r.pmk_r1, r.pmk_r1_name) < 0) {
1496 os_memset(pmk_r0, 0, PMK_LEN);
1497 return -1;
1498 }
1499 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
1500 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
1501 WPA_PMK_NAME_LEN);
1502 r.pairwise = host_to_le16(pairwise);
1503 os_memset(r.pad, 0, sizeof(r.pad));
1504
1505 if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1506 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1507 r.nonce, resp.nonce) < 0) {
1508 os_memset(pmk_r0, 0, PMK_LEN);
1509 return -1;
1510 }
1511
1512 os_memset(pmk_r0, 0, PMK_LEN);
1513
1514 wpa_ft_rrb_send(wpa_auth, src_addr, (u8 *) &resp, sizeof(resp));
1515
1516 return 0;
1517 }
1518
1519
ft_pull_resp_cb_finish(void * eloop_ctx,void * timeout_ctx)1520 static void ft_pull_resp_cb_finish(void *eloop_ctx, void *timeout_ctx)
1521 {
1522 struct wpa_state_machine *sm = eloop_ctx;
1523 int res;
1524 u8 *resp_ies;
1525 size_t resp_ies_len;
1526 u16 status;
1527
1528 res = wpa_ft_process_auth_req(sm, wpabuf_head(sm->ft_pending_req_ies),
1529 wpabuf_len(sm->ft_pending_req_ies),
1530 &resp_ies, &resp_ies_len);
1531 wpabuf_free(sm->ft_pending_req_ies);
1532 sm->ft_pending_req_ies = NULL;
1533 if (res < 0)
1534 res = WLAN_STATUS_UNSPECIFIED_FAILURE;
1535 status = res;
1536 wpa_printf(MSG_DEBUG, "FT: Postponed auth callback result for " MACSTR
1537 " - status %u", MAC2STR(sm->addr), status);
1538
1539 sm->ft_pending_cb(sm->ft_pending_cb_ctx, sm->addr, sm->wpa_auth->addr,
1540 sm->ft_pending_auth_transaction + 1, status,
1541 resp_ies, resp_ies_len);
1542 os_free(resp_ies);
1543 }
1544
1545
ft_pull_resp_cb(struct wpa_state_machine * sm,void * ctx)1546 static int ft_pull_resp_cb(struct wpa_state_machine *sm, void *ctx)
1547 {
1548 struct ft_r0kh_r1kh_resp_frame *frame = ctx;
1549
1550 if (os_memcmp(frame->s1kh_id, sm->addr, ETH_ALEN) != 0 ||
1551 os_memcmp(frame->nonce, sm->ft_pending_pull_nonce,
1552 FT_R0KH_R1KH_PULL_NONCE_LEN) != 0 ||
1553 sm->ft_pending_cb == NULL || sm->ft_pending_req_ies == NULL)
1554 return 0;
1555
1556 wpa_printf(MSG_DEBUG, "FT: Response to a pending pull request for "
1557 MACSTR " - process from timeout", MAC2STR(sm->addr));
1558 eloop_register_timeout(0, 0, ft_pull_resp_cb_finish, sm, NULL);
1559 return 1;
1560 }
1561
1562
wpa_ft_rrb_rx_resp(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1563 static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
1564 const u8 *src_addr,
1565 const u8 *data, size_t data_len)
1566 {
1567 struct ft_r0kh_r1kh_resp_frame f;
1568 const u8 *crypt;
1569 u8 *plain;
1570 struct ft_remote_r0kh *r0kh;
1571 int pairwise, res;
1572
1573 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
1574
1575 if (data_len < sizeof(f))
1576 return -1;
1577
1578 r0kh = wpa_auth->conf.r0kh_list;
1579 while (r0kh) {
1580 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1581 break;
1582 r0kh = r0kh->next;
1583 }
1584 if (r0kh == NULL) {
1585 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1586 "PMK-R0 pull response source address " MACSTR,
1587 MAC2STR(src_addr));
1588 return -1;
1589 }
1590
1591 crypt = data + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1592 os_memset(&f, 0, sizeof(f));
1593 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_resp_frame, nonce);
1594 /* aes_unwrap() does not support inplace decryption, so use a temporary
1595 * buffer for the data. */
1596 if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1597 (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
1598 crypt, plain) < 0) {
1599 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 pull "
1600 "response from " MACSTR, MAC2STR(src_addr));
1601 return -1;
1602 }
1603
1604 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1605 FT_R1KH_ID_LEN) != 0) {
1606 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull response did not use a "
1607 "matching R1KH-ID");
1608 return -1;
1609 }
1610
1611 pairwise = le_to_host16(f.pairwise);
1612 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
1613 f.nonce, sizeof(f.nonce));
1614 wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR " S1KH-ID="
1615 MACSTR " pairwise=0x%x",
1616 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1617 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
1618 f.pmk_r1, PMK_LEN);
1619 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
1620 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1621
1622 res = wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1623 pairwise);
1624 wpa_printf(MSG_DEBUG, "FT: Look for pending pull request");
1625 wpa_auth_for_each_sta(wpa_auth, ft_pull_resp_cb, &f);
1626 os_memset(f.pmk_r1, 0, PMK_LEN);
1627
1628 return res ? 0 : -1;
1629 }
1630
1631
wpa_ft_rrb_rx_push(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1632 static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
1633 const u8 *src_addr,
1634 const u8 *data, size_t data_len)
1635 {
1636 struct ft_r0kh_r1kh_push_frame f;
1637 const u8 *crypt;
1638 u8 *plain;
1639 struct ft_remote_r0kh *r0kh;
1640 struct os_time now;
1641 os_time_t tsend;
1642 int pairwise;
1643
1644 wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
1645
1646 if (data_len < sizeof(f))
1647 return -1;
1648
1649 r0kh = wpa_auth->conf.r0kh_list;
1650 while (r0kh) {
1651 if (os_memcmp(r0kh->addr, src_addr, ETH_ALEN) == 0)
1652 break;
1653 r0kh = r0kh->next;
1654 }
1655 if (r0kh == NULL) {
1656 wpa_printf(MSG_DEBUG, "FT: No matching R0KH address found for "
1657 "PMK-R0 push source address " MACSTR,
1658 MAC2STR(src_addr));
1659 return -1;
1660 }
1661
1662 crypt = data + offsetof(struct ft_r0kh_r1kh_push_frame, timestamp);
1663 os_memset(&f, 0, sizeof(f));
1664 plain = ((u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1665 timestamp);
1666 /* aes_unwrap() does not support inplace decryption, so use a temporary
1667 * buffer for the data. */
1668 if (aes_unwrap(r0kh->key, sizeof(r0kh->key),
1669 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1670 crypt, plain) < 0) {
1671 wpa_printf(MSG_DEBUG, "FT: Failed to decrypt PMK-R1 push from "
1672 MACSTR, MAC2STR(src_addr));
1673 return -1;
1674 }
1675
1676 os_get_time(&now);
1677 tsend = WPA_GET_LE32(f.timestamp);
1678 if ((now.sec > tsend && now.sec - tsend > 60) ||
1679 (now.sec < tsend && tsend - now.sec > 60)) {
1680 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not have a valid "
1681 "timestamp: sender time %d own time %d\n",
1682 (int) tsend, (int) now.sec);
1683 return -1;
1684 }
1685
1686 if (os_memcmp_const(f.r1kh_id, wpa_auth->conf.r1_key_holder,
1687 FT_R1KH_ID_LEN) != 0) {
1688 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push did not use a matching "
1689 "R1KH-ID (received " MACSTR " own " MACSTR ")",
1690 MAC2STR(f.r1kh_id),
1691 MAC2STR(wpa_auth->conf.r1_key_holder));
1692 return -1;
1693 }
1694
1695 pairwise = le_to_host16(f.pairwise);
1696 wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
1697 MACSTR " pairwise=0x%x",
1698 MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
1699 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
1700 f.pmk_r1, PMK_LEN);
1701 wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
1702 f.pmk_r1_name, WPA_PMK_NAME_LEN);
1703
1704 wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
1705 pairwise);
1706 os_memset(f.pmk_r1, 0, PMK_LEN);
1707
1708 return 0;
1709 }
1710
1711
wpa_ft_rrb_rx(struct wpa_authenticator * wpa_auth,const u8 * src_addr,const u8 * data,size_t data_len)1712 int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
1713 const u8 *data, size_t data_len)
1714 {
1715 struct ft_rrb_frame *frame;
1716 u16 alen;
1717 const u8 *pos, *end, *start;
1718 u8 action;
1719 const u8 *sta_addr, *target_ap_addr;
1720
1721 wpa_printf(MSG_DEBUG, "FT: RRB received frame from remote AP " MACSTR,
1722 MAC2STR(src_addr));
1723
1724 if (data_len < sizeof(*frame)) {
1725 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (data_len=%lu)",
1726 (unsigned long) data_len);
1727 return -1;
1728 }
1729
1730 pos = data;
1731 frame = (struct ft_rrb_frame *) pos;
1732 pos += sizeof(*frame);
1733
1734 alen = le_to_host16(frame->action_length);
1735 wpa_printf(MSG_DEBUG, "FT: RRB frame - frame_type=%d packet_type=%d "
1736 "action_length=%d ap_address=" MACSTR,
1737 frame->frame_type, frame->packet_type, alen,
1738 MAC2STR(frame->ap_address));
1739
1740 if (frame->frame_type != RSN_REMOTE_FRAME_TYPE_FT_RRB) {
1741 /* Discard frame per IEEE Std 802.11r-2008, 11A.10.3 */
1742 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with "
1743 "unrecognized type %d", frame->frame_type);
1744 return -1;
1745 }
1746
1747 if (alen > data_len - sizeof(*frame)) {
1748 wpa_printf(MSG_DEBUG, "FT: RRB frame too short for action "
1749 "frame");
1750 return -1;
1751 }
1752
1753 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PULL)
1754 return wpa_ft_rrb_rx_pull(wpa_auth, src_addr, data, data_len);
1755 if (frame->packet_type == FT_PACKET_R0KH_R1KH_RESP)
1756 return wpa_ft_rrb_rx_resp(wpa_auth, src_addr, data, data_len);
1757 if (frame->packet_type == FT_PACKET_R0KH_R1KH_PUSH)
1758 return wpa_ft_rrb_rx_push(wpa_auth, src_addr, data, data_len);
1759
1760 wpa_hexdump(MSG_MSGDUMP, "FT: RRB - FT Action frame", pos, alen);
1761
1762 if (alen < 1 + 1 + 2 * ETH_ALEN) {
1763 wpa_printf(MSG_DEBUG, "FT: Too short RRB frame (not enough "
1764 "room for Action Frame body); alen=%lu",
1765 (unsigned long) alen);
1766 return -1;
1767 }
1768 start = pos;
1769 end = pos + alen;
1770
1771 if (*pos != WLAN_ACTION_FT) {
1772 wpa_printf(MSG_DEBUG, "FT: Unexpected Action frame category "
1773 "%d", *pos);
1774 return -1;
1775 }
1776
1777 pos++;
1778 action = *pos++;
1779 sta_addr = pos;
1780 pos += ETH_ALEN;
1781 target_ap_addr = pos;
1782 pos += ETH_ALEN;
1783 wpa_printf(MSG_DEBUG, "FT: RRB Action Frame: action=%d sta_addr="
1784 MACSTR " target_ap_addr=" MACSTR,
1785 action, MAC2STR(sta_addr), MAC2STR(target_ap_addr));
1786
1787 if (frame->packet_type == FT_PACKET_REQUEST) {
1788 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Request");
1789
1790 if (action != 1) {
1791 wpa_printf(MSG_DEBUG, "FT: Unexpected Action %d in "
1792 "RRB Request", action);
1793 return -1;
1794 }
1795
1796 if (os_memcmp(target_ap_addr, wpa_auth->addr, ETH_ALEN) != 0) {
1797 wpa_printf(MSG_DEBUG, "FT: Target AP address in the "
1798 "RRB Request does not match with own "
1799 "address");
1800 return -1;
1801 }
1802
1803 if (wpa_ft_rrb_rx_request(wpa_auth, frame->ap_address,
1804 sta_addr, pos, end - pos) < 0)
1805 return -1;
1806 } else if (frame->packet_type == FT_PACKET_RESPONSE) {
1807 u16 status_code;
1808
1809 if (end - pos < 2) {
1810 wpa_printf(MSG_DEBUG, "FT: Not enough room for status "
1811 "code in RRB Response");
1812 return -1;
1813 }
1814 status_code = WPA_GET_LE16(pos);
1815 pos += 2;
1816
1817 wpa_printf(MSG_DEBUG, "FT: FT Packet Type - Response "
1818 "(status_code=%d)", status_code);
1819
1820 if (wpa_ft_action_send(wpa_auth, sta_addr, start, alen) < 0)
1821 return -1;
1822 } else {
1823 wpa_printf(MSG_DEBUG, "FT: RRB discarded frame with unknown "
1824 "packet_type %d", frame->packet_type);
1825 return -1;
1826 }
1827
1828 if (end > pos) {
1829 wpa_hexdump(MSG_DEBUG, "FT: Ignore extra data in end",
1830 pos, end - pos);
1831 }
1832
1833 return 0;
1834 }
1835
1836
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)1837 static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
1838 struct wpa_ft_pmk_r0_sa *pmk_r0,
1839 struct ft_remote_r1kh *r1kh,
1840 const u8 *s1kh_id, int pairwise)
1841 {
1842 struct ft_r0kh_r1kh_push_frame frame, f;
1843 struct os_time now;
1844 const u8 *plain;
1845 u8 *crypt;
1846
1847 os_memset(&frame, 0, sizeof(frame));
1848 frame.frame_type = RSN_REMOTE_FRAME_TYPE_FT_RRB;
1849 frame.packet_type = FT_PACKET_R0KH_R1KH_PUSH;
1850 frame.data_length = host_to_le16(FT_R0KH_R1KH_PUSH_DATA_LEN);
1851 os_memcpy(frame.ap_address, wpa_auth->addr, ETH_ALEN);
1852
1853 /* aes_wrap() does not support inplace encryption, so use a temporary
1854 * buffer for the data. */
1855 os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
1856 os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
1857 os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
1858 if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
1859 s1kh_id, f.pmk_r1, f.pmk_r1_name) < 0)
1860 return -1;
1861 wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
1862 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
1863 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
1864 WPA_PMK_NAME_LEN);
1865 os_get_time(&now);
1866 WPA_PUT_LE32(f.timestamp, now.sec);
1867 f.pairwise = host_to_le16(pairwise);
1868 os_memset(f.pad, 0, sizeof(f.pad));
1869 plain = ((const u8 *) &f) + offsetof(struct ft_r0kh_r1kh_push_frame,
1870 timestamp);
1871 crypt = ((u8 *) &frame) + offsetof(struct ft_r0kh_r1kh_push_frame,
1872 timestamp);
1873 if (aes_wrap(r1kh->key, sizeof(r1kh->key),
1874 (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
1875 plain, crypt) < 0)
1876 return -1;
1877
1878 wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
1879 return 0;
1880 }
1881
1882
wpa_ft_push_pmk_r1(struct wpa_authenticator * wpa_auth,const u8 * addr)1883 void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
1884 {
1885 struct wpa_ft_pmk_r0_sa *r0;
1886 struct ft_remote_r1kh *r1kh;
1887
1888 if (!wpa_auth->conf.pmk_r1_push)
1889 return;
1890
1891 r0 = wpa_auth->ft_pmk_cache->pmk_r0;
1892 while (r0) {
1893 if (os_memcmp(r0->spa, addr, ETH_ALEN) == 0)
1894 break;
1895 r0 = r0->next;
1896 }
1897
1898 if (r0 == NULL || r0->pmk_r1_pushed)
1899 return;
1900 r0->pmk_r1_pushed = 1;
1901
1902 wpa_printf(MSG_DEBUG, "FT: Deriving and pushing PMK-R1 keys to R1KHs "
1903 "for STA " MACSTR, MAC2STR(addr));
1904
1905 r1kh = wpa_auth->conf.r1kh_list;
1906 while (r1kh) {
1907 wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
1908 r1kh = r1kh->next;
1909 }
1910 }
1911
1912 #endif /* CONFIG_IEEE80211R_AP */
1913