1 /*
2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2006-2007, 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,size_t ptk_len)21 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
22 const struct wpa_eapol_key *key,
23 struct wpa_ptk *ptk, size_t ptk_len)
24 {
25 u8 ptk_name[WPA_PMK_NAME_LEN];
26 const u8 *anonce = key->key_nonce;
27
28 if (sm->xxkey_len == 0) {
29 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
30 "derivation");
31 return -1;
32 }
33
34 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
35 sm->ssid_len, sm->mobility_domain,
36 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
37 sm->pmk_r0, sm->pmk_r0_name);
38 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
39 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
40 sm->pmk_r0_name, WPA_PMK_NAME_LEN);
41 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
42 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
43 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
44 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
45 WPA_PMK_NAME_LEN);
46 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
47 sm->bssid, sm->pmk_r1_name,
48 (u8 *) ptk, ptk_len, ptk_name);
49 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
50 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
51
52 return 0;
53 }
54
55
56 /**
57 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
58 * @sm: Pointer to WPA state machine data from wpa_sm_init()
59 * @ies: Association Response IEs or %NULL to clear FT parameters
60 * @ies_len: Length of ies buffer in octets
61 * Returns: 0 on success, -1 on failure
62 */
wpa_sm_set_ft_params(struct wpa_sm * sm,const u8 * ies,size_t ies_len)63 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
64 {
65 struct wpa_ft_ies ft;
66
67 if (sm == NULL)
68 return 0;
69
70 if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0)
71 return -1;
72
73 if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
74 return -1;
75
76 if (ft.mdie) {
77 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
78 ft.mdie, MOBILITY_DOMAIN_ID_LEN);
79 os_memcpy(sm->mobility_domain, ft.mdie,
80 MOBILITY_DOMAIN_ID_LEN);
81 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
82 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
83 sm->mdie_ft_capab);
84 } else
85 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
86
87 if (ft.r0kh_id) {
88 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
89 ft.r0kh_id, ft.r0kh_id_len);
90 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
91 sm->r0kh_id_len = ft.r0kh_id_len;
92 } else {
93 /* FIX: When should R0KH-ID be cleared? We need to keep the
94 * old R0KH-ID in order to be able to use this during FT. */
95 /*
96 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
97 * sm->r0kh_id_len = 0;
98 */
99 }
100
101 if (ft.r1kh_id) {
102 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
103 ft.r1kh_id, FT_R1KH_ID_LEN);
104 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
105 } else
106 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
107
108 os_free(sm->assoc_resp_ies);
109 sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
110 if (sm->assoc_resp_ies) {
111 u8 *pos = sm->assoc_resp_ies;
112 if (ft.mdie) {
113 os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
114 pos += ft.mdie_len + 2;
115 }
116 if (ft.ftie) {
117 os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
118 pos += ft.ftie_len + 2;
119 }
120 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
121 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
122 "(Re)Association Response",
123 sm->assoc_resp_ies, sm->assoc_resp_ies_len);
124 }
125
126 return 0;
127 }
128
129
130 /**
131 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
132 * @sm: Pointer to WPA state machine data from wpa_sm_init()
133 * @len: Buffer for returning the length of the IEs
134 * @anonce: ANonce or %NULL if not yet available
135 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
136 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
137 * @target_ap: Target AP address
138 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
139 * @ric_ies_len: Length of ric_ies buffer in octets
140 * @ap_mdie: Mobility Domain IE from the target AP
141 * Returns: Pointer to buffer with IEs or %NULL on failure
142 *
143 * Caller is responsible for freeing the returned buffer with os_free();
144 */
wpa_ft_gen_req_ies(struct wpa_sm * sm,size_t * len,const u8 * anonce,const u8 * pmk_name,const u8 * kck,const u8 * target_ap,const u8 * ric_ies,size_t ric_ies_len,const u8 * ap_mdie)145 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
146 const u8 *anonce, const u8 *pmk_name,
147 const u8 *kck, const u8 *target_ap,
148 const u8 *ric_ies, size_t ric_ies_len,
149 const u8 *ap_mdie)
150 {
151 size_t buf_len;
152 u8 *buf, *pos, *ftie_len, *ftie_pos;
153 struct rsn_mdie *mdie;
154 struct rsn_ftie *ftie;
155 struct rsn_ie_hdr *rsnie;
156 u16 capab;
157
158 sm->ft_completed = 0;
159
160 buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
161 2 + sm->r0kh_id_len + ric_ies_len + 100;
162 buf = os_zalloc(buf_len);
163 if (buf == NULL)
164 return NULL;
165 pos = buf;
166
167 /* RSNIE[PMKR0Name/PMKR1Name] */
168 rsnie = (struct rsn_ie_hdr *) pos;
169 rsnie->elem_id = WLAN_EID_RSN;
170 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
171 pos = (u8 *) (rsnie + 1);
172
173 /* Group Suite Selector */
174 if (sm->group_cipher != WPA_CIPHER_CCMP &&
175 sm->group_cipher != WPA_CIPHER_GCMP &&
176 sm->group_cipher != WPA_CIPHER_TKIP) {
177 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
178 sm->group_cipher);
179 os_free(buf);
180 return NULL;
181 }
182 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
183 sm->group_cipher));
184 pos += RSN_SELECTOR_LEN;
185
186 /* Pairwise Suite Count */
187 WPA_PUT_LE16(pos, 1);
188 pos += 2;
189
190 /* Pairwise Suite List */
191 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
192 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
193 sm->pairwise_cipher);
194 os_free(buf);
195 return NULL;
196 }
197 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
198 sm->pairwise_cipher));
199 pos += RSN_SELECTOR_LEN;
200
201 /* Authenticated Key Management Suite Count */
202 WPA_PUT_LE16(pos, 1);
203 pos += 2;
204
205 /* Authenticated Key Management Suite List */
206 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
207 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
208 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
209 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
210 else {
211 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
212 sm->key_mgmt);
213 os_free(buf);
214 return NULL;
215 }
216 pos += RSN_SELECTOR_LEN;
217
218 /* RSN Capabilities */
219 capab = 0;
220 #ifdef CONFIG_IEEE80211W
221 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
222 capab |= WPA_CAPABILITY_MFPC;
223 #endif /* CONFIG_IEEE80211W */
224 WPA_PUT_LE16(pos, capab);
225 pos += 2;
226
227 /* PMKID Count */
228 WPA_PUT_LE16(pos, 1);
229 pos += 2;
230
231 /* PMKID List [PMKR0Name/PMKR1Name] */
232 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
233 pos += WPA_PMK_NAME_LEN;
234
235 #ifdef CONFIG_IEEE80211W
236 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
237 /* Management Group Cipher Suite */
238 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
239 pos += RSN_SELECTOR_LEN;
240 }
241 #endif /* CONFIG_IEEE80211W */
242
243 rsnie->len = (pos - (u8 *) rsnie) - 2;
244
245 /* MDIE */
246 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
247 *pos++ = sizeof(*mdie);
248 mdie = (struct rsn_mdie *) pos;
249 pos += sizeof(*mdie);
250 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
251 MOBILITY_DOMAIN_ID_LEN);
252 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
253 sm->mdie_ft_capab;
254
255 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
256 ftie_pos = pos;
257 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
258 ftie_len = pos++;
259 ftie = (struct rsn_ftie *) pos;
260 pos += sizeof(*ftie);
261 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
262 if (anonce)
263 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
264 if (kck) {
265 /* R1KH-ID sub-element in third FT message */
266 *pos++ = FTIE_SUBELEM_R1KH_ID;
267 *pos++ = FT_R1KH_ID_LEN;
268 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
269 pos += FT_R1KH_ID_LEN;
270 }
271 /* R0KH-ID sub-element */
272 *pos++ = FTIE_SUBELEM_R0KH_ID;
273 *pos++ = sm->r0kh_id_len;
274 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
275 pos += sm->r0kh_id_len;
276 *ftie_len = pos - ftie_len - 1;
277
278 if (ric_ies) {
279 /* RIC Request */
280 os_memcpy(pos, ric_ies, ric_ies_len);
281 pos += ric_ies_len;
282 }
283
284 if (kck) {
285 /*
286 * IEEE Std 802.11r-2008, 11A.8.4
287 * MIC shall be calculated over:
288 * non-AP STA MAC address
289 * Target AP MAC address
290 * Transaction seq number (5 for ReassocReq, 3 otherwise)
291 * RSN IE
292 * MDIE
293 * FTIE (with MIC field set to 0)
294 * RIC-Request (if present)
295 */
296 /* Information element count */
297 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
298 ric_ies_len);
299 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
300 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
301 ftie_pos, 2 + *ftie_len,
302 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
303 ric_ies_len, ftie->mic) < 0) {
304 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
305 os_free(buf);
306 return NULL;
307 }
308 }
309
310 *len = pos - buf;
311
312 return buf;
313 }
314
315
wpa_ft_install_ptk(struct wpa_sm * sm,const u8 * bssid)316 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
317 {
318 int keylen;
319 enum wpa_alg alg;
320 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
321
322 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
323
324 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
325 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
326 sm->pairwise_cipher);
327 return -1;
328 }
329
330 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
331 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
332
333 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
334 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
335 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
336 return -1;
337 }
338
339 return 0;
340 }
341
342
343 /**
344 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
345 * @sm: Pointer to WPA state machine data from wpa_sm_init()
346 * @mdie: Target AP MDIE
347 * Returns: 0 on success, -1 on failure
348 */
wpa_ft_prepare_auth_request(struct wpa_sm * sm,const u8 * mdie)349 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
350 {
351 u8 *ft_ies;
352 size_t ft_ies_len;
353
354 /* Generate a new SNonce */
355 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
356 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
357 return -1;
358 }
359
360 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
361 NULL, sm->bssid, NULL, 0, mdie);
362 if (ft_ies) {
363 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
364 ft_ies, ft_ies_len);
365 os_free(ft_ies);
366 }
367
368 return 0;
369 }
370
371
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)372 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
373 int ft_action, const u8 *target_ap,
374 const u8 *ric_ies, size_t ric_ies_len)
375 {
376 u8 *ft_ies;
377 size_t ft_ies_len, ptk_len;
378 struct wpa_ft_ies parse;
379 struct rsn_mdie *mdie;
380 struct rsn_ftie *ftie;
381 u8 ptk_name[WPA_PMK_NAME_LEN];
382 int ret;
383 const u8 *bssid;
384
385 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
386 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
387
388 if (ft_action) {
389 if (!sm->over_the_ds_in_progress) {
390 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
391 "- drop FT Action Response");
392 return -1;
393 }
394
395 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
396 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
397 "with this Target AP - drop FT Action "
398 "Response");
399 return -1;
400 }
401 }
402
403 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
404 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
405 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
406 "enabled for this connection");
407 return -1;
408 }
409
410 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
411 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
412 return -1;
413 }
414
415 mdie = (struct rsn_mdie *) parse.mdie;
416 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
417 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
418 MOBILITY_DOMAIN_ID_LEN) != 0) {
419 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
420 return -1;
421 }
422
423 ftie = (struct rsn_ftie *) parse.ftie;
424 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
425 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
426 return -1;
427 }
428
429 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
430 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
431 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
432 ftie->snonce, WPA_NONCE_LEN);
433 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
434 sm->snonce, WPA_NONCE_LEN);
435 return -1;
436 }
437
438 if (parse.r0kh_id == NULL) {
439 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
440 return -1;
441 }
442
443 if (parse.r0kh_id_len != sm->r0kh_id_len ||
444 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
445 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
446 "the current R0KH-ID");
447 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
448 parse.r0kh_id, parse.r0kh_id_len);
449 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
450 sm->r0kh_id, sm->r0kh_id_len);
451 return -1;
452 }
453
454 if (parse.r1kh_id == NULL) {
455 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
456 return -1;
457 }
458
459 if (parse.rsn_pmkid == NULL ||
460 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
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 ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
479 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
480 bssid, sm->pmk_r1_name,
481 (u8 *) &sm->ptk, ptk_len, ptk_name);
482 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
483 (u8 *) &sm->ptk, ptk_len);
484 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
485
486 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
487 sm->pmk_r1_name, sm->ptk.kck, bssid,
488 ric_ies, ric_ies_len,
489 parse.mdie ? parse.mdie - 2 : NULL);
490 if (ft_ies) {
491 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
492 ft_ies, ft_ies_len);
493 os_free(ft_ies);
494 }
495
496 wpa_sm_mark_authenticated(sm, bssid);
497 ret = wpa_ft_install_ptk(sm, bssid);
498 if (ret) {
499 /*
500 * Some drivers do not support key configuration when we are
501 * not associated with the target AP. Work around this by
502 * trying again after the following reassociation gets
503 * completed.
504 */
505 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
506 "association - try again after reassociation");
507 sm->set_ptk_after_assoc = 1;
508 } else
509 sm->set_ptk_after_assoc = 0;
510
511 sm->ft_completed = 1;
512 if (ft_action) {
513 /*
514 * The caller is expected trigger re-association with the
515 * Target AP.
516 */
517 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
518 }
519
520 return 0;
521 }
522
523
wpa_ft_is_completed(struct wpa_sm * sm)524 int wpa_ft_is_completed(struct wpa_sm *sm)
525 {
526 if (sm == NULL)
527 return 0;
528
529 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
530 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
531 return 0;
532
533 return sm->ft_completed;
534 }
535
536
wpa_ft_process_gtk_subelem(struct wpa_sm * sm,const u8 * gtk_elem,size_t gtk_elem_len)537 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
538 size_t gtk_elem_len)
539 {
540 u8 gtk[32];
541 int keyidx;
542 enum wpa_alg alg;
543 size_t gtk_len, keylen, rsc_len;
544
545 if (gtk_elem == NULL) {
546 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
547 return 0;
548 }
549
550 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
551 gtk_elem, gtk_elem_len);
552
553 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
554 gtk_elem_len - 19 > sizeof(gtk)) {
555 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
556 "length %lu", (unsigned long) gtk_elem_len);
557 return -1;
558 }
559 gtk_len = gtk_elem_len - 19;
560 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
561 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
562 "decrypt GTK");
563 return -1;
564 }
565
566 keylen = wpa_cipher_key_len(sm->group_cipher);
567 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
568 alg = wpa_cipher_to_alg(sm->group_cipher);
569 if (alg == WPA_ALG_NONE) {
570 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
571 sm->group_cipher);
572 return -1;
573 }
574
575 if (gtk_len < keylen) {
576 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
577 return -1;
578 }
579
580 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
581
582 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
583
584 if (gtk_elem[2] != keylen) {
585 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
586 "negotiated %lu",
587 gtk_elem[2], (unsigned long) keylen);
588 return -1;
589 }
590
591 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
592 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
593 gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
594 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
595 "driver.");
596 return -1;
597 }
598
599 return 0;
600 }
601
602
603 #ifdef CONFIG_IEEE80211W
wpa_ft_process_igtk_subelem(struct wpa_sm * sm,const u8 * igtk_elem,size_t igtk_elem_len)604 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
605 size_t igtk_elem_len)
606 {
607 u8 igtk[WPA_IGTK_LEN];
608 u16 keyidx;
609
610 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
611 return 0;
612
613 if (igtk_elem == NULL) {
614 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
615 return 0;
616 }
617
618 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
619 igtk_elem, igtk_elem_len);
620
621 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
622 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
623 "length %lu", (unsigned long) igtk_elem_len);
624 return -1;
625 }
626 if (igtk_elem[8] != WPA_IGTK_LEN) {
627 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
628 "%d", igtk_elem[8]);
629 return -1;
630 }
631
632 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
633 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
634 "decrypt IGTK");
635 return -1;
636 }
637
638 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
639
640 keyidx = WPA_GET_LE16(igtk_elem);
641
642 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
643 WPA_IGTK_LEN);
644 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
645 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
646 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
647 "driver.");
648 return -1;
649 }
650
651 return 0;
652 }
653 #endif /* CONFIG_IEEE80211W */
654
655
wpa_ft_validate_reassoc_resp(struct wpa_sm * sm,const u8 * ies,size_t ies_len,const u8 * src_addr)656 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
657 size_t ies_len, const u8 *src_addr)
658 {
659 struct wpa_ft_ies parse;
660 struct rsn_mdie *mdie;
661 struct rsn_ftie *ftie;
662 unsigned int count;
663 u8 mic[16];
664
665 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
666
667 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
668 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
669 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
670 "enabled for this connection");
671 return -1;
672 }
673
674 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
675 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
676 return -1;
677 }
678
679 mdie = (struct rsn_mdie *) parse.mdie;
680 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
681 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
682 MOBILITY_DOMAIN_ID_LEN) != 0) {
683 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
684 return -1;
685 }
686
687 ftie = (struct rsn_ftie *) parse.ftie;
688 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
689 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
690 return -1;
691 }
692
693 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
694 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
695 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
696 ftie->snonce, WPA_NONCE_LEN);
697 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
698 sm->snonce, WPA_NONCE_LEN);
699 return -1;
700 }
701
702 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
703 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
704 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
705 ftie->anonce, WPA_NONCE_LEN);
706 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
707 sm->anonce, WPA_NONCE_LEN);
708 return -1;
709 }
710
711 if (parse.r0kh_id == NULL) {
712 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
713 return -1;
714 }
715
716 if (parse.r0kh_id_len != sm->r0kh_id_len ||
717 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
718 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
719 "the current R0KH-ID");
720 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
721 parse.r0kh_id, parse.r0kh_id_len);
722 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
723 sm->r0kh_id, sm->r0kh_id_len);
724 return -1;
725 }
726
727 if (parse.r1kh_id == NULL) {
728 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
729 return -1;
730 }
731
732 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
733 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
734 "ReassocResp");
735 return -1;
736 }
737
738 if (parse.rsn_pmkid == NULL ||
739 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
740 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
741 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
742 return -1;
743 }
744
745 count = 3;
746 if (parse.ric)
747 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
748 if (ftie->mic_control[1] != count) {
749 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
750 "Control: received %u expected %u",
751 ftie->mic_control[1], count);
752 return -1;
753 }
754
755 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
756 parse.mdie - 2, parse.mdie_len + 2,
757 parse.ftie - 2, parse.ftie_len + 2,
758 parse.rsn - 2, parse.rsn_len + 2,
759 parse.ric, parse.ric_len,
760 mic) < 0) {
761 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
762 return -1;
763 }
764
765 if (os_memcmp(mic, ftie->mic, 16) != 0) {
766 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
767 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
768 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
769 return -1;
770 }
771
772 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
773 return -1;
774
775 #ifdef CONFIG_IEEE80211W
776 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
777 return -1;
778 #endif /* CONFIG_IEEE80211W */
779
780 if (sm->set_ptk_after_assoc) {
781 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
782 "are associated");
783 if (wpa_ft_install_ptk(sm, src_addr) < 0)
784 return -1;
785 sm->set_ptk_after_assoc = 0;
786 }
787
788 if (parse.ric) {
789 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
790 parse.ric, parse.ric_len);
791 /* TODO: parse response and inform driver about results when
792 * using wpa_supplicant SME */
793 }
794
795 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
796
797 return 0;
798 }
799
800
801 /**
802 * wpa_ft_start_over_ds - Generate over-the-DS auth request
803 * @sm: Pointer to WPA state machine data from wpa_sm_init()
804 * @target_ap: Target AP Address
805 * @mdie: Mobility Domain IE from the target AP
806 * Returns: 0 on success, -1 on failure
807 */
wpa_ft_start_over_ds(struct wpa_sm * sm,const u8 * target_ap,const u8 * mdie)808 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
809 const u8 *mdie)
810 {
811 u8 *ft_ies;
812 size_t ft_ies_len;
813
814 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
815 MAC2STR(target_ap));
816
817 /* Generate a new SNonce */
818 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
819 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
820 return -1;
821 }
822
823 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
824 NULL, target_ap, NULL, 0, mdie);
825 if (ft_ies) {
826 sm->over_the_ds_in_progress = 1;
827 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
828 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
829 os_free(ft_ies);
830 }
831
832 return 0;
833 }
834
835 #endif /* CONFIG_IEEE80211R */
836