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 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
176 else if (sm->group_cipher == WPA_CIPHER_TKIP)
177 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
178 else {
179 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
180 sm->group_cipher);
181 os_free(buf);
182 return NULL;
183 }
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 (sm->pairwise_cipher == WPA_CIPHER_CCMP)
192 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
193 else if (sm->pairwise_cipher == WPA_CIPHER_TKIP)
194 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
195 else {
196 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
197 sm->pairwise_cipher);
198 os_free(buf);
199 return NULL;
200 }
201 pos += RSN_SELECTOR_LEN;
202
203 /* Authenticated Key Management Suite Count */
204 WPA_PUT_LE16(pos, 1);
205 pos += 2;
206
207 /* Authenticated Key Management Suite List */
208 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
209 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
210 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
211 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
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 switch (sm->pairwise_cipher) {
327 case WPA_CIPHER_CCMP:
328 alg = WPA_ALG_CCMP;
329 keylen = 16;
330 break;
331 case WPA_CIPHER_TKIP:
332 alg = WPA_ALG_TKIP;
333 keylen = 32;
334 break;
335 default:
336 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
337 sm->pairwise_cipher);
338 return -1;
339 }
340
341 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
342 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
343 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
344 return -1;
345 }
346
347 return 0;
348 }
349
350
351 /**
352 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
353 * @sm: Pointer to WPA state machine data from wpa_sm_init()
354 * @mdie: Target AP MDIE
355 * Returns: 0 on success, -1 on failure
356 */
wpa_ft_prepare_auth_request(struct wpa_sm * sm,const u8 * mdie)357 int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
358 {
359 u8 *ft_ies;
360 size_t ft_ies_len;
361
362 /* Generate a new SNonce */
363 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
364 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
365 return -1;
366 }
367
368 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
369 NULL, sm->bssid, NULL, 0, mdie);
370 if (ft_ies) {
371 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
372 ft_ies, ft_ies_len);
373 os_free(ft_ies);
374 }
375
376 return 0;
377 }
378
379
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)380 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
381 int ft_action, const u8 *target_ap,
382 const u8 *ric_ies, size_t ric_ies_len)
383 {
384 u8 *ft_ies;
385 size_t ft_ies_len, ptk_len;
386 struct wpa_ft_ies parse;
387 struct rsn_mdie *mdie;
388 struct rsn_ftie *ftie;
389 u8 ptk_name[WPA_PMK_NAME_LEN];
390 int ret;
391 const u8 *bssid;
392
393 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
394 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
395
396 if (ft_action) {
397 if (!sm->over_the_ds_in_progress) {
398 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
399 "- drop FT Action Response");
400 return -1;
401 }
402
403 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
404 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
405 "with this Target AP - drop FT Action "
406 "Response");
407 return -1;
408 }
409 }
410
411 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
412 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
413 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
414 "enabled for this connection");
415 return -1;
416 }
417
418 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
419 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
420 return -1;
421 }
422
423 mdie = (struct rsn_mdie *) parse.mdie;
424 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
425 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
426 MOBILITY_DOMAIN_ID_LEN) != 0) {
427 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
428 return -1;
429 }
430
431 ftie = (struct rsn_ftie *) parse.ftie;
432 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
433 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
434 return -1;
435 }
436
437 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
438 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
439 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
440 ftie->snonce, WPA_NONCE_LEN);
441 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
442 sm->snonce, WPA_NONCE_LEN);
443 return -1;
444 }
445
446 if (parse.r0kh_id == NULL) {
447 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
448 return -1;
449 }
450
451 if (parse.r0kh_id_len != sm->r0kh_id_len ||
452 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
453 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
454 "the current R0KH-ID");
455 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
456 parse.r0kh_id, parse.r0kh_id_len);
457 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
458 sm->r0kh_id, sm->r0kh_id_len);
459 return -1;
460 }
461
462 if (parse.r1kh_id == NULL) {
463 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
464 return -1;
465 }
466
467 if (parse.rsn_pmkid == NULL ||
468 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
469 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
470 "RSNIE");
471 return -1;
472 }
473
474 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
475 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
476 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
477 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
478 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
479 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
480 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
481 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
482 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
483 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
484
485 bssid = target_ap;
486 ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64;
487 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
488 bssid, sm->pmk_r1_name,
489 (u8 *) &sm->ptk, ptk_len, ptk_name);
490 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
491 (u8 *) &sm->ptk, ptk_len);
492 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
493
494 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
495 sm->pmk_r1_name, sm->ptk.kck, bssid,
496 ric_ies, ric_ies_len,
497 parse.mdie ? parse.mdie - 2 : NULL);
498 if (ft_ies) {
499 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
500 ft_ies, ft_ies_len);
501 os_free(ft_ies);
502 }
503
504 wpa_sm_mark_authenticated(sm, bssid);
505 ret = wpa_ft_install_ptk(sm, bssid);
506 if (ret) {
507 /*
508 * Some drivers do not support key configuration when we are
509 * not associated with the target AP. Work around this by
510 * trying again after the following reassociation gets
511 * completed.
512 */
513 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
514 "association - try again after reassociation");
515 sm->set_ptk_after_assoc = 1;
516 } else
517 sm->set_ptk_after_assoc = 0;
518
519 sm->ft_completed = 1;
520 if (ft_action) {
521 /*
522 * The caller is expected trigger re-association with the
523 * Target AP.
524 */
525 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
526 }
527
528 return 0;
529 }
530
531
wpa_ft_is_completed(struct wpa_sm * sm)532 int wpa_ft_is_completed(struct wpa_sm *sm)
533 {
534 if (sm == NULL)
535 return 0;
536
537 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
538 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
539 return 0;
540
541 return sm->ft_completed;
542 }
543
544
wpa_ft_process_gtk_subelem(struct wpa_sm * sm,const u8 * gtk_elem,size_t gtk_elem_len)545 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
546 size_t gtk_elem_len)
547 {
548 u8 gtk[32];
549 int keyidx;
550 enum wpa_alg alg;
551 size_t gtk_len, keylen, rsc_len;
552
553 if (gtk_elem == NULL) {
554 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
555 return 0;
556 }
557
558 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
559 gtk_elem, gtk_elem_len);
560
561 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
562 gtk_elem_len - 19 > sizeof(gtk)) {
563 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
564 "length %lu", (unsigned long) gtk_elem_len);
565 return -1;
566 }
567 gtk_len = gtk_elem_len - 19;
568 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
569 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
570 "decrypt GTK");
571 return -1;
572 }
573
574 switch (sm->group_cipher) {
575 case WPA_CIPHER_CCMP:
576 keylen = 16;
577 rsc_len = 6;
578 alg = WPA_ALG_CCMP;
579 break;
580 case WPA_CIPHER_TKIP:
581 keylen = 32;
582 rsc_len = 6;
583 alg = WPA_ALG_TKIP;
584 break;
585 case WPA_CIPHER_WEP104:
586 keylen = 13;
587 rsc_len = 0;
588 alg = WPA_ALG_WEP;
589 break;
590 case WPA_CIPHER_WEP40:
591 keylen = 5;
592 rsc_len = 0;
593 alg = WPA_ALG_WEP;
594 break;
595 default:
596 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
597 sm->group_cipher);
598 return -1;
599 }
600
601 if (gtk_len < keylen) {
602 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
603 return -1;
604 }
605
606 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
607
608 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
609
610 if (gtk_elem[2] != keylen) {
611 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
612 "negotiated %lu",
613 gtk_elem[2], (unsigned long) keylen);
614 return -1;
615 }
616
617 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
618 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
619 gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
620 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
621 "driver.");
622 return -1;
623 }
624
625 return 0;
626 }
627
628
629 #ifdef CONFIG_IEEE80211W
wpa_ft_process_igtk_subelem(struct wpa_sm * sm,const u8 * igtk_elem,size_t igtk_elem_len)630 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
631 size_t igtk_elem_len)
632 {
633 u8 igtk[WPA_IGTK_LEN];
634 u16 keyidx;
635
636 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
637 return 0;
638
639 if (igtk_elem == NULL) {
640 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
641 return 0;
642 }
643
644 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
645 igtk_elem, igtk_elem_len);
646
647 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
648 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
649 "length %lu", (unsigned long) igtk_elem_len);
650 return -1;
651 }
652 if (igtk_elem[8] != WPA_IGTK_LEN) {
653 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
654 "%d", igtk_elem[8]);
655 return -1;
656 }
657
658 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
659 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
660 "decrypt IGTK");
661 return -1;
662 }
663
664 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
665
666 keyidx = WPA_GET_LE16(igtk_elem);
667
668 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
669 WPA_IGTK_LEN);
670 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
671 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
672 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
673 "driver.");
674 return -1;
675 }
676
677 return 0;
678 }
679 #endif /* CONFIG_IEEE80211W */
680
681
wpa_ft_validate_reassoc_resp(struct wpa_sm * sm,const u8 * ies,size_t ies_len,const u8 * src_addr)682 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
683 size_t ies_len, const u8 *src_addr)
684 {
685 struct wpa_ft_ies parse;
686 struct rsn_mdie *mdie;
687 struct rsn_ftie *ftie;
688 unsigned int count;
689 u8 mic[16];
690
691 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
692
693 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
694 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
695 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
696 "enabled for this connection");
697 return -1;
698 }
699
700 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
701 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
702 return -1;
703 }
704
705 mdie = (struct rsn_mdie *) parse.mdie;
706 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
707 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
708 MOBILITY_DOMAIN_ID_LEN) != 0) {
709 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
710 return -1;
711 }
712
713 ftie = (struct rsn_ftie *) parse.ftie;
714 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
715 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
716 return -1;
717 }
718
719 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
720 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
721 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
722 ftie->snonce, WPA_NONCE_LEN);
723 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
724 sm->snonce, WPA_NONCE_LEN);
725 return -1;
726 }
727
728 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
729 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
730 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
731 ftie->anonce, WPA_NONCE_LEN);
732 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
733 sm->anonce, WPA_NONCE_LEN);
734 return -1;
735 }
736
737 if (parse.r0kh_id == NULL) {
738 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
739 return -1;
740 }
741
742 if (parse.r0kh_id_len != sm->r0kh_id_len ||
743 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
744 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
745 "the current R0KH-ID");
746 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
747 parse.r0kh_id, parse.r0kh_id_len);
748 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
749 sm->r0kh_id, sm->r0kh_id_len);
750 return -1;
751 }
752
753 if (parse.r1kh_id == NULL) {
754 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
755 return -1;
756 }
757
758 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
759 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
760 "ReassocResp");
761 return -1;
762 }
763
764 if (parse.rsn_pmkid == NULL ||
765 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
766 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
767 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
768 return -1;
769 }
770
771 count = 3;
772 if (parse.ric)
773 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
774 if (ftie->mic_control[1] != count) {
775 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
776 "Control: received %u expected %u",
777 ftie->mic_control[1], count);
778 return -1;
779 }
780
781 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
782 parse.mdie - 2, parse.mdie_len + 2,
783 parse.ftie - 2, parse.ftie_len + 2,
784 parse.rsn - 2, parse.rsn_len + 2,
785 parse.ric, parse.ric_len,
786 mic) < 0) {
787 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
788 return -1;
789 }
790
791 if (os_memcmp(mic, ftie->mic, 16) != 0) {
792 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
793 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
794 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
795 return -1;
796 }
797
798 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
799 return -1;
800
801 #ifdef CONFIG_IEEE80211W
802 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
803 return -1;
804 #endif /* CONFIG_IEEE80211W */
805
806 if (sm->set_ptk_after_assoc) {
807 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
808 "are associated");
809 if (wpa_ft_install_ptk(sm, src_addr) < 0)
810 return -1;
811 sm->set_ptk_after_assoc = 0;
812 }
813
814 if (parse.ric) {
815 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
816 parse.ric, parse.ric_len);
817 /* TODO: parse response and inform driver about results */
818 }
819
820 return 0;
821 }
822
823
824 /**
825 * wpa_ft_start_over_ds - Generate over-the-DS auth request
826 * @sm: Pointer to WPA state machine data from wpa_sm_init()
827 * @target_ap: Target AP Address
828 * @mdie: Mobility Domain IE from the target AP
829 * Returns: 0 on success, -1 on failure
830 */
wpa_ft_start_over_ds(struct wpa_sm * sm,const u8 * target_ap,const u8 * mdie)831 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
832 const u8 *mdie)
833 {
834 u8 *ft_ies;
835 size_t ft_ies_len;
836
837 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
838 MAC2STR(target_ap));
839
840 /* Generate a new SNonce */
841 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
842 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
843 return -1;
844 }
845
846 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
847 NULL, target_ap, NULL, 0, mdie);
848 if (ft_ies) {
849 sm->over_the_ds_in_progress = 1;
850 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
851 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
852 os_free(ft_ies);
853 }
854
855 return 0;
856 }
857
858 #endif /* CONFIG_IEEE80211R */
859