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 if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
211 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
212 else {
213 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
214 sm->key_mgmt);
215 os_free(buf);
216 return NULL;
217 }
218 pos += RSN_SELECTOR_LEN;
219
220 /* RSN Capabilities */
221 capab = 0;
222 #ifdef CONFIG_IEEE80211W
223 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
224 capab |= WPA_CAPABILITY_MFPC;
225 #endif /* CONFIG_IEEE80211W */
226 WPA_PUT_LE16(pos, capab);
227 pos += 2;
228
229 /* PMKID Count */
230 WPA_PUT_LE16(pos, 1);
231 pos += 2;
232
233 /* PMKID List [PMKR0Name/PMKR1Name] */
234 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
235 pos += WPA_PMK_NAME_LEN;
236
237 #ifdef CONFIG_IEEE80211W
238 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
239 /* Management Group Cipher Suite */
240 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
241 pos += RSN_SELECTOR_LEN;
242 }
243 #endif /* CONFIG_IEEE80211W */
244
245 rsnie->len = (pos - (u8 *) rsnie) - 2;
246
247 /* MDIE */
248 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
249 *pos++ = sizeof(*mdie);
250 mdie = (struct rsn_mdie *) pos;
251 pos += sizeof(*mdie);
252 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
253 MOBILITY_DOMAIN_ID_LEN);
254 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
255 sm->mdie_ft_capab;
256
257 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
258 ftie_pos = pos;
259 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
260 ftie_len = pos++;
261 ftie = (struct rsn_ftie *) pos;
262 pos += sizeof(*ftie);
263 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
264 if (anonce)
265 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
266 if (kck) {
267 /* R1KH-ID sub-element in third FT message */
268 *pos++ = FTIE_SUBELEM_R1KH_ID;
269 *pos++ = FT_R1KH_ID_LEN;
270 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
271 pos += FT_R1KH_ID_LEN;
272 }
273 /* R0KH-ID sub-element */
274 *pos++ = FTIE_SUBELEM_R0KH_ID;
275 *pos++ = sm->r0kh_id_len;
276 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
277 pos += sm->r0kh_id_len;
278 *ftie_len = pos - ftie_len - 1;
279
280 if (ric_ies) {
281 /* RIC Request */
282 os_memcpy(pos, ric_ies, ric_ies_len);
283 pos += ric_ies_len;
284 }
285
286 if (kck) {
287 /*
288 * IEEE Std 802.11r-2008, 11A.8.4
289 * MIC shall be calculated over:
290 * non-AP STA MAC address
291 * Target AP MAC address
292 * Transaction seq number (5 for ReassocReq, 3 otherwise)
293 * RSN IE
294 * MDIE
295 * FTIE (with MIC field set to 0)
296 * RIC-Request (if present)
297 */
298 /* Information element count */
299 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
300 ric_ies_len);
301 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
302 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
303 ftie_pos, 2 + *ftie_len,
304 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
305 ric_ies_len, ftie->mic) < 0) {
306 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
307 os_free(buf);
308 return NULL;
309 }
310 }
311
312 *len = pos - buf;
313
314 return buf;
315 }
316
317
wpa_ft_install_ptk(struct wpa_sm * sm,const u8 * bssid)318 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
319 {
320 int keylen;
321 enum wpa_alg alg;
322 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
323
324 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
325
326 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
327 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
328 sm->pairwise_cipher);
329 return -1;
330 }
331
332 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
333 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
334
335 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
336 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
337 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
338 return -1;
339 }
340
341 return 0;
342 }
343
344
345 /**
346 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
347 * @sm: Pointer to WPA state machine data from wpa_sm_init()
348 * @mdie: Target AP MDIE
349 * Returns: 0 on success, -1 on failure
350 */
wpa_ft_prepare_auth_request(struct wpa_sm * sm,const u8 * mdie)351 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
352 {
353 u8 *ft_ies;
354 size_t ft_ies_len;
355
356 /* Generate a new SNonce */
357 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
358 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
359 return -1;
360 }
361
362 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
363 NULL, sm->bssid, NULL, 0, mdie);
364 if (ft_ies) {
365 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
366 ft_ies, ft_ies_len);
367 os_free(ft_ies);
368 }
369
370 return 0;
371 }
372
373
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)374 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
375 int ft_action, const u8 *target_ap,
376 const u8 *ric_ies, size_t ric_ies_len)
377 {
378 u8 *ft_ies;
379 size_t ft_ies_len, ptk_len;
380 struct wpa_ft_ies parse;
381 struct rsn_mdie *mdie;
382 struct rsn_ftie *ftie;
383 u8 ptk_name[WPA_PMK_NAME_LEN];
384 int ret;
385 const u8 *bssid;
386
387 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
388 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
389
390 if (ft_action) {
391 if (!sm->over_the_ds_in_progress) {
392 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
393 "- drop FT Action Response");
394 return -1;
395 }
396
397 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
398 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
399 "with this Target AP - drop FT Action "
400 "Response");
401 return -1;
402 }
403 }
404
405 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
406 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
407 "enabled for this connection");
408 return -1;
409 }
410
411 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
412 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
413 return -1;
414 }
415
416 mdie = (struct rsn_mdie *) parse.mdie;
417 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
418 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
419 MOBILITY_DOMAIN_ID_LEN) != 0) {
420 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
421 return -1;
422 }
423
424 ftie = (struct rsn_ftie *) parse.ftie;
425 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
426 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
427 return -1;
428 }
429
430 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
431 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
432 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
433 ftie->snonce, WPA_NONCE_LEN);
434 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
435 sm->snonce, WPA_NONCE_LEN);
436 return -1;
437 }
438
439 if (parse.r0kh_id == NULL) {
440 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
441 return -1;
442 }
443
444 if (parse.r0kh_id_len != sm->r0kh_id_len ||
445 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
446 {
447 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
448 "the current R0KH-ID");
449 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
450 parse.r0kh_id, parse.r0kh_id_len);
451 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
452 sm->r0kh_id, sm->r0kh_id_len);
453 return -1;
454 }
455
456 if (parse.r1kh_id == NULL) {
457 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
458 return -1;
459 }
460
461 if (parse.rsn_pmkid == NULL ||
462 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
463 {
464 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
465 "RSNIE");
466 return -1;
467 }
468
469 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
470 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
471 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
472 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
473 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
474 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
475 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
476 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
477 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
478 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
479
480 bssid = target_ap;
481 ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
482 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
483 bssid, sm->pmk_r1_name,
484 (u8 *) &sm->ptk, ptk_len, ptk_name);
485 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
486 (u8 *) &sm->ptk, ptk_len);
487 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
488
489 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
490 sm->pmk_r1_name, sm->ptk.kck, bssid,
491 ric_ies, ric_ies_len,
492 parse.mdie ? parse.mdie - 2 : NULL);
493 if (ft_ies) {
494 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
495 ft_ies, ft_ies_len);
496 os_free(ft_ies);
497 }
498
499 wpa_sm_mark_authenticated(sm, bssid);
500 ret = wpa_ft_install_ptk(sm, bssid);
501 if (ret) {
502 /*
503 * Some drivers do not support key configuration when we are
504 * not associated with the target AP. Work around this by
505 * trying again after the following reassociation gets
506 * completed.
507 */
508 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
509 "association - try again after reassociation");
510 sm->set_ptk_after_assoc = 1;
511 } else
512 sm->set_ptk_after_assoc = 0;
513
514 sm->ft_completed = 1;
515 if (ft_action) {
516 /*
517 * The caller is expected trigger re-association with the
518 * Target AP.
519 */
520 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
521 }
522
523 return 0;
524 }
525
526
wpa_ft_is_completed(struct wpa_sm * sm)527 int wpa_ft_is_completed(struct wpa_sm *sm)
528 {
529 if (sm == NULL)
530 return 0;
531
532 if (!wpa_key_mgmt_ft(sm->key_mgmt))
533 return 0;
534
535 return sm->ft_completed;
536 }
537
538
wpa_reset_ft_completed(struct wpa_sm * sm)539 void wpa_reset_ft_completed(struct wpa_sm *sm)
540 {
541 if (sm != NULL)
542 sm->ft_completed = 0;
543 }
544
545
wpa_ft_process_gtk_subelem(struct wpa_sm * sm,const u8 * gtk_elem,size_t gtk_elem_len)546 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
547 size_t gtk_elem_len)
548 {
549 u8 gtk[32];
550 int keyidx;
551 enum wpa_alg alg;
552 size_t gtk_len, keylen, rsc_len;
553
554 if (gtk_elem == NULL) {
555 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
556 return 0;
557 }
558
559 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
560 gtk_elem, gtk_elem_len);
561
562 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
563 gtk_elem_len - 19 > sizeof(gtk)) {
564 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
565 "length %lu", (unsigned long) gtk_elem_len);
566 return -1;
567 }
568 gtk_len = gtk_elem_len - 19;
569 if (aes_unwrap(sm->ptk.kek, 16, gtk_len / 8, gtk_elem + 11, gtk)) {
570 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
571 "decrypt GTK");
572 return -1;
573 }
574
575 keylen = wpa_cipher_key_len(sm->group_cipher);
576 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
577 alg = wpa_cipher_to_alg(sm->group_cipher);
578 if (alg == WPA_ALG_NONE) {
579 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
580 sm->group_cipher);
581 return -1;
582 }
583
584 if (gtk_len < keylen) {
585 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
586 return -1;
587 }
588
589 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
590
591 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
592
593 if (gtk_elem[2] != keylen) {
594 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
595 "negotiated %lu",
596 gtk_elem[2], (unsigned long) keylen);
597 return -1;
598 }
599
600 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
601 if (sm->group_cipher == WPA_CIPHER_TKIP) {
602 /* Swap Tx/Rx keys for Michael MIC */
603 u8 tmp[8];
604 os_memcpy(tmp, gtk + 16, 8);
605 os_memcpy(gtk + 16, gtk + 24, 8);
606 os_memcpy(gtk + 24, tmp, 8);
607 }
608 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
609 gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
610 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
611 "driver.");
612 return -1;
613 }
614
615 return 0;
616 }
617
618
619 #ifdef CONFIG_IEEE80211W
wpa_ft_process_igtk_subelem(struct wpa_sm * sm,const u8 * igtk_elem,size_t igtk_elem_len)620 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
621 size_t igtk_elem_len)
622 {
623 u8 igtk[WPA_IGTK_LEN];
624 u16 keyidx;
625
626 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
627 return 0;
628
629 if (igtk_elem == NULL) {
630 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
631 return 0;
632 }
633
634 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
635 igtk_elem, igtk_elem_len);
636
637 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
638 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
639 "length %lu", (unsigned long) igtk_elem_len);
640 return -1;
641 }
642 if (igtk_elem[8] != WPA_IGTK_LEN) {
643 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
644 "%d", igtk_elem[8]);
645 return -1;
646 }
647
648 if (aes_unwrap(sm->ptk.kek, 16, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk))
649 {
650 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
651 "decrypt IGTK");
652 return -1;
653 }
654
655 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
656
657 keyidx = WPA_GET_LE16(igtk_elem);
658
659 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
660 WPA_IGTK_LEN);
661 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
662 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
663 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
664 "driver.");
665 return -1;
666 }
667
668 return 0;
669 }
670 #endif /* CONFIG_IEEE80211W */
671
672
wpa_ft_validate_reassoc_resp(struct wpa_sm * sm,const u8 * ies,size_t ies_len,const u8 * src_addr)673 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
674 size_t ies_len, const u8 *src_addr)
675 {
676 struct wpa_ft_ies parse;
677 struct rsn_mdie *mdie;
678 struct rsn_ftie *ftie;
679 unsigned int count;
680 u8 mic[16];
681
682 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
683
684 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
685 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
686 "enabled for this connection");
687 return -1;
688 }
689
690 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
691 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
692 return -1;
693 }
694
695 mdie = (struct rsn_mdie *) parse.mdie;
696 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
697 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
698 MOBILITY_DOMAIN_ID_LEN) != 0) {
699 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
700 return -1;
701 }
702
703 ftie = (struct rsn_ftie *) parse.ftie;
704 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
705 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
706 return -1;
707 }
708
709 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
710 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
711 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
712 ftie->snonce, WPA_NONCE_LEN);
713 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
714 sm->snonce, WPA_NONCE_LEN);
715 return -1;
716 }
717
718 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
719 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
720 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
721 ftie->anonce, WPA_NONCE_LEN);
722 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
723 sm->anonce, WPA_NONCE_LEN);
724 return -1;
725 }
726
727 if (parse.r0kh_id == NULL) {
728 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
729 return -1;
730 }
731
732 if (parse.r0kh_id_len != sm->r0kh_id_len ||
733 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
734 {
735 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
736 "the current R0KH-ID");
737 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
738 parse.r0kh_id, parse.r0kh_id_len);
739 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
740 sm->r0kh_id, sm->r0kh_id_len);
741 return -1;
742 }
743
744 if (parse.r1kh_id == NULL) {
745 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
746 return -1;
747 }
748
749 if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
750 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
751 "ReassocResp");
752 return -1;
753 }
754
755 if (parse.rsn_pmkid == NULL ||
756 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
757 {
758 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
759 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
760 return -1;
761 }
762
763 count = 3;
764 if (parse.ric)
765 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
766 if (ftie->mic_control[1] != count) {
767 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
768 "Control: received %u expected %u",
769 ftie->mic_control[1], count);
770 return -1;
771 }
772
773 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
774 parse.mdie - 2, parse.mdie_len + 2,
775 parse.ftie - 2, parse.ftie_len + 2,
776 parse.rsn - 2, parse.rsn_len + 2,
777 parse.ric, parse.ric_len,
778 mic) < 0) {
779 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
780 return -1;
781 }
782
783 if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
784 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
785 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
786 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
787 return -1;
788 }
789
790 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
791 return -1;
792
793 #ifdef CONFIG_IEEE80211W
794 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
795 return -1;
796 #endif /* CONFIG_IEEE80211W */
797
798 if (sm->set_ptk_after_assoc) {
799 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
800 "are associated");
801 if (wpa_ft_install_ptk(sm, src_addr) < 0)
802 return -1;
803 sm->set_ptk_after_assoc = 0;
804 }
805
806 if (parse.ric) {
807 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
808 parse.ric, parse.ric_len);
809 /* TODO: parse response and inform driver about results when
810 * using wpa_supplicant SME */
811 }
812
813 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
814
815 return 0;
816 }
817
818
819 /**
820 * wpa_ft_start_over_ds - Generate over-the-DS auth request
821 * @sm: Pointer to WPA state machine data from wpa_sm_init()
822 * @target_ap: Target AP Address
823 * @mdie: Mobility Domain IE from the target AP
824 * Returns: 0 on success, -1 on failure
825 */
wpa_ft_start_over_ds(struct wpa_sm * sm,const u8 * target_ap,const u8 * mdie)826 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
827 const u8 *mdie)
828 {
829 u8 *ft_ies;
830 size_t ft_ies_len;
831
832 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
833 MAC2STR(target_ap));
834
835 /* Generate a new SNonce */
836 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
837 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
838 return -1;
839 }
840
841 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
842 NULL, target_ap, NULL, 0, mdie);
843 if (ft_ies) {
844 sm->over_the_ds_in_progress = 1;
845 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
846 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
847 os_free(ft_ies);
848 }
849
850 return 0;
851 }
852
853 #endif /* CONFIG_IEEE80211R */
854