1 /*
2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2006-2015, 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 "includes.h"
10
11 #include "common.h"
12 #include "crypto/aes_wrap.h"
13 #include "crypto/random.h"
14 #include "common/ieee802_11_defs.h"
15 #include "common/ieee802_11_common.h"
16 #include "wpa.h"
17 #include "wpa_i.h"
18
19 #ifdef CONFIG_IEEE80211R
20
wpa_derive_ptk_ft(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,struct wpa_ptk * ptk)21 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
22 const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
23 {
24 u8 ptk_name[WPA_PMK_NAME_LEN];
25 const u8 *anonce = key->key_nonce;
26
27 if (sm->xxkey_len == 0) {
28 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
29 "derivation");
30 return -1;
31 }
32
33 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
34 sm->ssid_len, sm->mobility_domain,
35 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
36 sm->pmk_r0, sm->pmk_r0_name);
37 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
38 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
39 sm->pmk_r0_name, WPA_PMK_NAME_LEN);
40 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
41 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
42 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
43 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
44 WPA_PMK_NAME_LEN);
45 return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
46 sm->bssid, sm->pmk_r1_name, ptk, ptk_name,
47 sm->key_mgmt, sm->pairwise_cipher);
48 }
49
50
51 /**
52 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
53 * @sm: Pointer to WPA state machine data from wpa_sm_init()
54 * @ies: Association Response IEs or %NULL to clear FT parameters
55 * @ies_len: Length of ies buffer in octets
56 * Returns: 0 on success, -1 on failure
57 */
wpa_sm_set_ft_params(struct wpa_sm * sm,const u8 * ies,size_t ies_len)58 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
59 {
60 struct wpa_ft_ies ft;
61
62 if (sm == NULL)
63 return 0;
64
65 if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0)
66 return -1;
67
68 if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
69 return -1;
70
71 if (ft.mdie) {
72 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
73 ft.mdie, MOBILITY_DOMAIN_ID_LEN);
74 os_memcpy(sm->mobility_domain, ft.mdie,
75 MOBILITY_DOMAIN_ID_LEN);
76 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
77 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
78 sm->mdie_ft_capab);
79 } else
80 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
81
82 if (ft.r0kh_id) {
83 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
84 ft.r0kh_id, ft.r0kh_id_len);
85 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
86 sm->r0kh_id_len = ft.r0kh_id_len;
87 } else {
88 /* FIX: When should R0KH-ID be cleared? We need to keep the
89 * old R0KH-ID in order to be able to use this during FT. */
90 /*
91 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
92 * sm->r0kh_id_len = 0;
93 */
94 }
95
96 if (ft.r1kh_id) {
97 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
98 ft.r1kh_id, FT_R1KH_ID_LEN);
99 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
100 } else
101 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
102
103 os_free(sm->assoc_resp_ies);
104 sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
105 if (sm->assoc_resp_ies) {
106 u8 *pos = sm->assoc_resp_ies;
107 if (ft.mdie) {
108 os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
109 pos += ft.mdie_len + 2;
110 }
111 if (ft.ftie) {
112 os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
113 pos += ft.ftie_len + 2;
114 }
115 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
116 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
117 "(Re)Association Response",
118 sm->assoc_resp_ies, sm->assoc_resp_ies_len);
119 }
120
121 return 0;
122 }
123
124
125 /**
126 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
127 * @sm: Pointer to WPA state machine data from wpa_sm_init()
128 * @len: Buffer for returning the length of the IEs
129 * @anonce: ANonce or %NULL if not yet available
130 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
131 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
132 * @kck_len: KCK length in octets
133 * @target_ap: Target AP address
134 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
135 * @ric_ies_len: Length of ric_ies buffer in octets
136 * @ap_mdie: Mobility Domain IE from the target AP
137 * Returns: Pointer to buffer with IEs or %NULL on failure
138 *
139 * Caller is responsible for freeing the returned buffer with os_free();
140 */
wpa_ft_gen_req_ies(struct wpa_sm * sm,size_t * len,const u8 * anonce,const u8 * pmk_name,const u8 * kck,size_t kck_len,const u8 * target_ap,const u8 * ric_ies,size_t ric_ies_len,const u8 * ap_mdie)141 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
142 const u8 *anonce, const u8 *pmk_name,
143 const u8 *kck, size_t kck_len,
144 const u8 *target_ap,
145 const u8 *ric_ies, size_t ric_ies_len,
146 const u8 *ap_mdie)
147 {
148 size_t buf_len;
149 u8 *buf, *pos, *ftie_len, *ftie_pos;
150 struct rsn_mdie *mdie;
151 struct rsn_ftie *ftie;
152 struct rsn_ie_hdr *rsnie;
153 u16 capab;
154
155 sm->ft_completed = 0;
156
157 buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
158 2 + sm->r0kh_id_len + ric_ies_len + 100;
159 buf = os_zalloc(buf_len);
160 if (buf == NULL)
161 return NULL;
162 pos = buf;
163
164 /* RSNIE[PMKR0Name/PMKR1Name] */
165 rsnie = (struct rsn_ie_hdr *) pos;
166 rsnie->elem_id = WLAN_EID_RSN;
167 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
168 pos = (u8 *) (rsnie + 1);
169
170 /* Group Suite Selector */
171 if (sm->group_cipher != WPA_CIPHER_CCMP &&
172 sm->group_cipher != WPA_CIPHER_GCMP &&
173 sm->group_cipher != WPA_CIPHER_TKIP) {
174 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
175 sm->group_cipher);
176 os_free(buf);
177 return NULL;
178 }
179 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
180 sm->group_cipher));
181 pos += RSN_SELECTOR_LEN;
182
183 /* Pairwise Suite Count */
184 WPA_PUT_LE16(pos, 1);
185 pos += 2;
186
187 /* Pairwise Suite List */
188 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
189 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
190 sm->pairwise_cipher);
191 os_free(buf);
192 return NULL;
193 }
194 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
195 sm->pairwise_cipher));
196 pos += RSN_SELECTOR_LEN;
197
198 /* Authenticated Key Management Suite Count */
199 WPA_PUT_LE16(pos, 1);
200 pos += 2;
201
202 /* Authenticated Key Management Suite List */
203 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
204 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
205 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
206 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
207 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
208 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
209 else {
210 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
211 sm->key_mgmt);
212 os_free(buf);
213 return NULL;
214 }
215 pos += RSN_SELECTOR_LEN;
216
217 /* RSN Capabilities */
218 capab = 0;
219 #ifdef CONFIG_IEEE80211W
220 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
221 capab |= WPA_CAPABILITY_MFPC;
222 #endif /* CONFIG_IEEE80211W */
223 WPA_PUT_LE16(pos, capab);
224 pos += 2;
225
226 /* PMKID Count */
227 WPA_PUT_LE16(pos, 1);
228 pos += 2;
229
230 /* PMKID List [PMKR0Name/PMKR1Name] */
231 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
232 pos += WPA_PMK_NAME_LEN;
233
234 #ifdef CONFIG_IEEE80211W
235 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
236 /* Management Group Cipher Suite */
237 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
238 pos += RSN_SELECTOR_LEN;
239 }
240 #endif /* CONFIG_IEEE80211W */
241
242 rsnie->len = (pos - (u8 *) rsnie) - 2;
243
244 /* MDIE */
245 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
246 *pos++ = sizeof(*mdie);
247 mdie = (struct rsn_mdie *) pos;
248 pos += sizeof(*mdie);
249 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
250 MOBILITY_DOMAIN_ID_LEN);
251 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
252 sm->mdie_ft_capab;
253
254 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
255 ftie_pos = pos;
256 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
257 ftie_len = pos++;
258 ftie = (struct rsn_ftie *) pos;
259 pos += sizeof(*ftie);
260 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
261 if (anonce)
262 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
263 if (kck) {
264 /* R1KH-ID sub-element in third FT message */
265 *pos++ = FTIE_SUBELEM_R1KH_ID;
266 *pos++ = FT_R1KH_ID_LEN;
267 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
268 pos += FT_R1KH_ID_LEN;
269 }
270 /* R0KH-ID sub-element */
271 *pos++ = FTIE_SUBELEM_R0KH_ID;
272 *pos++ = sm->r0kh_id_len;
273 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
274 pos += sm->r0kh_id_len;
275 *ftie_len = pos - ftie_len - 1;
276
277 if (ric_ies) {
278 /* RIC Request */
279 os_memcpy(pos, ric_ies, ric_ies_len);
280 pos += ric_ies_len;
281 }
282
283 if (kck) {
284 /*
285 * IEEE Std 802.11r-2008, 11A.8.4
286 * MIC shall be calculated over:
287 * non-AP STA MAC address
288 * Target AP MAC address
289 * Transaction seq number (5 for ReassocReq, 3 otherwise)
290 * RSN IE
291 * MDIE
292 * FTIE (with MIC field set to 0)
293 * RIC-Request (if present)
294 */
295 /* Information element count */
296 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
297 ric_ies_len);
298 if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5,
299 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
300 ftie_pos, 2 + *ftie_len,
301 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
302 ric_ies_len, ftie->mic) < 0) {
303 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
304 os_free(buf);
305 return NULL;
306 }
307 }
308
309 *len = pos - buf;
310
311 return buf;
312 }
313
314
wpa_ft_install_ptk(struct wpa_sm * sm,const u8 * bssid)315 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
316 {
317 int keylen;
318 enum wpa_alg alg;
319 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
320
321 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
322
323 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
324 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
325 sm->pairwise_cipher);
326 return -1;
327 }
328
329 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
330 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
331
332 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
333 sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen) < 0) {
334 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
335 return -1;
336 }
337
338 return 0;
339 }
340
341
342 /**
343 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
344 * @sm: Pointer to WPA state machine data from wpa_sm_init()
345 * @mdie: Target AP MDIE
346 * Returns: 0 on success, -1 on failure
347 */
wpa_ft_prepare_auth_request(struct wpa_sm * sm,const u8 * mdie)348 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
349 {
350 u8 *ft_ies;
351 size_t ft_ies_len;
352
353 /* Generate a new SNonce */
354 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
355 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
356 return -1;
357 }
358
359 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
360 NULL, 0, sm->bssid, NULL, 0, mdie);
361 if (ft_ies) {
362 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
363 ft_ies, ft_ies_len);
364 os_free(ft_ies);
365 }
366
367 return 0;
368 }
369
370
wpa_ft_process_response(struct wpa_sm * sm,const u8 * ies,size_t ies_len,int ft_action,const u8 * target_ap,const u8 * ric_ies,size_t ric_ies_len)371 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
372 int ft_action, const u8 *target_ap,
373 const u8 *ric_ies, size_t ric_ies_len)
374 {
375 u8 *ft_ies;
376 size_t ft_ies_len;
377 struct wpa_ft_ies parse;
378 struct rsn_mdie *mdie;
379 struct rsn_ftie *ftie;
380 u8 ptk_name[WPA_PMK_NAME_LEN];
381 int ret;
382 const u8 *bssid;
383
384 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
385 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
386
387 if (ft_action) {
388 if (!sm->over_the_ds_in_progress) {
389 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
390 "- drop FT Action Response");
391 return -1;
392 }
393
394 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
395 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
396 "with this Target AP - drop FT Action "
397 "Response");
398 return -1;
399 }
400 }
401
402 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
403 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
404 "enabled for this connection");
405 return -1;
406 }
407
408 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
409 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
410 return -1;
411 }
412
413 mdie = (struct rsn_mdie *) parse.mdie;
414 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
415 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
416 MOBILITY_DOMAIN_ID_LEN) != 0) {
417 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
418 return -1;
419 }
420
421 ftie = (struct rsn_ftie *) parse.ftie;
422 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
423 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
424 return -1;
425 }
426
427 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
428 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
429 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
430 ftie->snonce, WPA_NONCE_LEN);
431 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
432 sm->snonce, WPA_NONCE_LEN);
433 return -1;
434 }
435
436 if (parse.r0kh_id == NULL) {
437 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
438 return -1;
439 }
440
441 if (parse.r0kh_id_len != sm->r0kh_id_len ||
442 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
443 {
444 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
445 "the current R0KH-ID");
446 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
447 parse.r0kh_id, parse.r0kh_id_len);
448 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
449 sm->r0kh_id, sm->r0kh_id_len);
450 return -1;
451 }
452
453 if (parse.r1kh_id == NULL) {
454 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
455 return -1;
456 }
457
458 if (parse.rsn_pmkid == NULL ||
459 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
460 {
461 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
462 "RSNIE");
463 return -1;
464 }
465
466 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
467 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
468 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
469 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
470 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
471 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
472 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
473 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
474 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
475 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
476
477 bssid = target_ap;
478 if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce,
479 sm->own_addr, bssid, sm->pmk_r1_name, &sm->ptk,
480 ptk_name, sm->key_mgmt, sm->pairwise_cipher) < 0)
481 return -1;
482
483 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
484 sm->pmk_r1_name,
485 sm->ptk.kck, sm->ptk.kck_len, bssid,
486 ric_ies, ric_ies_len,
487 parse.mdie ? parse.mdie - 2 : NULL);
488 if (ft_ies) {
489 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
490 ft_ies, ft_ies_len);
491 os_free(ft_ies);
492 }
493
494 wpa_sm_mark_authenticated(sm, bssid);
495 ret = wpa_ft_install_ptk(sm, bssid);
496 if (ret) {
497 /*
498 * Some drivers do not support key configuration when we are
499 * not associated with the target AP. Work around this by
500 * trying again after the following reassociation gets
501 * completed.
502 */
503 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
504 "association - try again after reassociation");
505 sm->set_ptk_after_assoc = 1;
506 } else
507 sm->set_ptk_after_assoc = 0;
508
509 sm->ft_completed = 1;
510 if (ft_action) {
511 /*
512 * The caller is expected trigger re-association with the
513 * Target AP.
514 */
515 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
516 }
517
518 return 0;
519 }
520
521
wpa_ft_is_completed(struct wpa_sm * sm)522 int wpa_ft_is_completed(struct wpa_sm *sm)
523 {
524 if (sm == NULL)
525 return 0;
526
527 if (!wpa_key_mgmt_ft(sm->key_mgmt))
528 return 0;
529
530 return sm->ft_completed;
531 }
532
533
wpa_reset_ft_completed(struct wpa_sm * sm)534 void wpa_reset_ft_completed(struct wpa_sm *sm)
535 {
536 if (sm != NULL)
537 sm->ft_completed = 0;
538 }
539
540
wpa_ft_process_gtk_subelem(struct wpa_sm * sm,const u8 * gtk_elem,size_t gtk_elem_len)541 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
542 size_t gtk_elem_len)
543 {
544 u8 gtk[32];
545 int keyidx;
546 enum wpa_alg alg;
547 size_t gtk_len, keylen, rsc_len;
548
549 if (gtk_elem == NULL) {
550 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
551 return 0;
552 }
553
554 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
555 gtk_elem, gtk_elem_len);
556
557 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
558 gtk_elem_len - 19 > sizeof(gtk)) {
559 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
560 "length %lu", (unsigned long) gtk_elem_len);
561 return -1;
562 }
563 gtk_len = gtk_elem_len - 19;
564 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, gtk_len / 8, gtk_elem + 11,
565 gtk)) {
566 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
567 "decrypt GTK");
568 return -1;
569 }
570
571 keylen = wpa_cipher_key_len(sm->group_cipher);
572 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
573 alg = wpa_cipher_to_alg(sm->group_cipher);
574 if (alg == WPA_ALG_NONE) {
575 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
576 sm->group_cipher);
577 return -1;
578 }
579
580 if (gtk_len < keylen) {
581 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
582 return -1;
583 }
584
585 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
586
587 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
588
589 if (gtk_elem[2] != keylen) {
590 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
591 "negotiated %lu",
592 gtk_elem[2], (unsigned long) keylen);
593 return -1;
594 }
595
596 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
597 if (sm->group_cipher == WPA_CIPHER_TKIP) {
598 /* Swap Tx/Rx keys for Michael MIC */
599 u8 tmp[8];
600 os_memcpy(tmp, gtk + 16, 8);
601 os_memcpy(gtk + 16, gtk + 24, 8);
602 os_memcpy(gtk + 24, tmp, 8);
603 }
604 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
605 gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
606 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
607 "driver.");
608 return -1;
609 }
610
611 return 0;
612 }
613
614
615 #ifdef CONFIG_IEEE80211W
wpa_ft_process_igtk_subelem(struct wpa_sm * sm,const u8 * igtk_elem,size_t igtk_elem_len)616 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
617 size_t igtk_elem_len)
618 {
619 u8 igtk[WPA_IGTK_LEN];
620 u16 keyidx;
621
622 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
623 return 0;
624
625 if (igtk_elem == NULL) {
626 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
627 return 0;
628 }
629
630 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
631 igtk_elem, igtk_elem_len);
632
633 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
634 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
635 "length %lu", (unsigned long) igtk_elem_len);
636 return -1;
637 }
638 if (igtk_elem[8] != WPA_IGTK_LEN) {
639 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
640 "%d", igtk_elem[8]);
641 return -1;
642 }
643
644 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, WPA_IGTK_LEN / 8,
645 igtk_elem + 9, igtk)) {
646 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
647 "decrypt IGTK");
648 return -1;
649 }
650
651 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
652
653 keyidx = WPA_GET_LE16(igtk_elem);
654
655 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
656 WPA_IGTK_LEN);
657 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
658 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
659 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
660 "driver.");
661 return -1;
662 }
663
664 return 0;
665 }
666 #endif /* CONFIG_IEEE80211W */
667
668
wpa_ft_validate_reassoc_resp(struct wpa_sm * sm,const u8 * ies,size_t ies_len,const u8 * src_addr)669 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
670 size_t ies_len, const u8 *src_addr)
671 {
672 struct wpa_ft_ies parse;
673 struct rsn_mdie *mdie;
674 struct rsn_ftie *ftie;
675 unsigned int count;
676 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
677
678 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
679
680 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
681 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
682 "enabled for this connection");
683 return -1;
684 }
685
686 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
687 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
688 return -1;
689 }
690
691 mdie = (struct rsn_mdie *) parse.mdie;
692 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
693 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
694 MOBILITY_DOMAIN_ID_LEN) != 0) {
695 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
696 return -1;
697 }
698
699 ftie = (struct rsn_ftie *) parse.ftie;
700 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
701 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
702 return -1;
703 }
704
705 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
706 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
707 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
708 ftie->snonce, WPA_NONCE_LEN);
709 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
710 sm->snonce, WPA_NONCE_LEN);
711 return -1;
712 }
713
714 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
715 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
716 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
717 ftie->anonce, WPA_NONCE_LEN);
718 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
719 sm->anonce, WPA_NONCE_LEN);
720 return -1;
721 }
722
723 if (parse.r0kh_id == NULL) {
724 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
725 return -1;
726 }
727
728 if (parse.r0kh_id_len != sm->r0kh_id_len ||
729 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
730 {
731 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
732 "the current R0KH-ID");
733 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
734 parse.r0kh_id, parse.r0kh_id_len);
735 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
736 sm->r0kh_id, sm->r0kh_id_len);
737 return -1;
738 }
739
740 if (parse.r1kh_id == NULL) {
741 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
742 return -1;
743 }
744
745 if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
746 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
747 "ReassocResp");
748 return -1;
749 }
750
751 if (parse.rsn_pmkid == NULL ||
752 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
753 {
754 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
755 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
756 return -1;
757 }
758
759 count = 3;
760 if (parse.ric)
761 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
762 if (ftie->mic_control[1] != count) {
763 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
764 "Control: received %u expected %u",
765 ftie->mic_control[1], count);
766 return -1;
767 }
768
769 if (wpa_ft_mic(sm->ptk.kck, sm->ptk.kck_len, sm->own_addr, src_addr, 6,
770 parse.mdie - 2, parse.mdie_len + 2,
771 parse.ftie - 2, parse.ftie_len + 2,
772 parse.rsn - 2, parse.rsn_len + 2,
773 parse.ric, parse.ric_len,
774 mic) < 0) {
775 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
776 return -1;
777 }
778
779 if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
780 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
781 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
782 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
783 return -1;
784 }
785
786 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
787 return -1;
788
789 #ifdef CONFIG_IEEE80211W
790 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
791 return -1;
792 #endif /* CONFIG_IEEE80211W */
793
794 if (sm->set_ptk_after_assoc) {
795 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
796 "are associated");
797 if (wpa_ft_install_ptk(sm, src_addr) < 0)
798 return -1;
799 sm->set_ptk_after_assoc = 0;
800 }
801
802 if (parse.ric) {
803 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
804 parse.ric, parse.ric_len);
805 /* TODO: parse response and inform driver about results when
806 * using wpa_supplicant SME */
807 }
808
809 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
810
811 return 0;
812 }
813
814
815 /**
816 * wpa_ft_start_over_ds - Generate over-the-DS auth request
817 * @sm: Pointer to WPA state machine data from wpa_sm_init()
818 * @target_ap: Target AP Address
819 * @mdie: Mobility Domain IE from the target AP
820 * Returns: 0 on success, -1 on failure
821 */
wpa_ft_start_over_ds(struct wpa_sm * sm,const u8 * target_ap,const u8 * mdie)822 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
823 const u8 *mdie)
824 {
825 u8 *ft_ies;
826 size_t ft_ies_len;
827
828 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
829 MAC2STR(target_ap));
830
831 /* Generate a new SNonce */
832 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
833 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
834 return -1;
835 }
836
837 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
838 NULL, 0, target_ap, NULL, 0, mdie);
839 if (ft_ies) {
840 sm->over_the_ds_in_progress = 1;
841 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
842 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
843 os_free(ft_ies);
844 }
845
846 return 0;
847 }
848
849 #endif /* CONFIG_IEEE80211R */
850