]> git.ipfire.org Git - thirdparty/hostap.git/blame - src/rsn_supp/wpa_ft.c
projects / thirdparty / hostap.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Move variable declaration into the beginning of function
[thirdparty/hostap.git] / src / rsn_supp / wpa_ft.c
CommitLineData
6fc6879b
JM		 1/*
2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
4 *
0f3d578e
JM		 5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
6fc6879b
JM		 7 */
8
9#include "includes.h"
10
11#include "common.h"
03da66bd 12#include "crypto/aes_wrap.h"
3642c431 13#include "crypto/random.h"
03da66bd
JM		 14#include "common/ieee802_11_defs.h"
15#include "common/ieee802_11_common.h"
6fc6879b
JM		 16#include "wpa.h"
17#include "wpa_i.h"
6fc6879b
JM		 18
19#ifdef CONFIG_IEEE80211R
20
21int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
22 const struct wpa_eapol_key *key,
c0a61908 23 struct wpa_ptk *ptk, size_t ptk_len)
6fc6879b 24{
6fc6879b
JM		 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,
26e23750 42 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
6fc6879b 43 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
26e23750
JM		 44 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
45 WPA_PMK_NAME_LEN);
6fc6879b 46 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
26e23750 47 sm->bssid, sm->pmk_r1_name,
c0a61908
JM		 48 (u8 *) ptk, ptk_len, ptk_name);
49 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
6fc6879b
JM		 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()
e7846b68
JM		 59 * @ies: Association Response IEs or %NULL to clear FT parameters
60 * @ies_len: Length of ies buffer in octets
6fc6879b
JM		 61 * Returns: 0 on success, -1 on failure
62 */
e7846b68 63int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
6fc6879b 64{
e7846b68
JM		 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) {
6fc6879b 77 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
e7846b68
JM		 78 ft.mdie, MOBILITY_DOMAIN_ID_LEN);
79 os_memcpy(sm->mobility_domain, ft.mdie,
6fc6879b 80 MOBILITY_DOMAIN_ID_LEN);
e7846b68 81 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
f4ec630d
JM		 82 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
83 sm->mdie_ft_capab);
e7846b68 84 } else
6fc6879b
JM		 85 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
86
e7846b68
JM		 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 {
6fc6879b
JM		 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
e7846b68
JM		 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
6fc6879b
JM		 106 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
107
55046414
JM		 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
6fc6879b
JM		 126 return 0;
127}
128
129
130/**
babfbf15 131 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
6fc6879b
JM		 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
babfbf15
JM		 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
76b7981d 140 * @ap_mdie: Mobility Domain IE from the target AP
6fc6879b
JM		 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 */
145static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
146 const u8 *anonce, const u8 *pmk_name,
babfbf15 147 const u8 *kck, const u8 *target_ap,
76b7981d
JM		 148 const u8 *ric_ies, size_t ric_ies_len,
149 const u8 *ap_mdie)
6fc6879b
JM		 150{
151 size_t buf_len;
ccfab35a 152 u8 *buf, *pos, *ftie_len, *ftie_pos;
6fc6879b
JM		 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) +
babfbf15 161 2 + sm->r0kh_id_len + ric_ies_len + 100;
6fc6879b
JM		 162 buf = os_zalloc(buf_len);
163 if (buf == NULL)
164 return NULL;
165 pos = buf;
166
babfbf15 167 /* RSNIE[PMKR0Name/PMKR1Name] */
6fc6879b
JM		 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);
eb7719ff
JM		 176 else if (sm->group_cipher == WPA_CIPHER_GCMP)
177 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_GCMP);
6fc6879b
JM		 178 else if (sm->group_cipher == WPA_CIPHER_TKIP)
179 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
180 else {
181 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
182 sm->group_cipher);
183 os_free(buf);
184 return NULL;
185 }
186 pos += RSN_SELECTOR_LEN;
187
188 /* Pairwise Suite Count */
189 WPA_PUT_LE16(pos, 1);
190 pos += 2;
191
192 /* Pairwise Suite List */
193 if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
194 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
eb7719ff
JM		 195 else if (sm->pairwise_cipher == WPA_CIPHER_GCMP)
196 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_GCMP);
6fc6879b
JM		 197 else if (sm->pairwise_cipher == WPA_CIPHER_TKIP)
198 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
199 else {
200 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
201 sm->pairwise_cipher);
202 os_free(buf);
203 return NULL;
204 }
205 pos += RSN_SELECTOR_LEN;
206
207 /* Authenticated Key Management Suite Count */
208 WPA_PUT_LE16(pos, 1);
209 pos += 2;
210
211 /* Authenticated Key Management Suite List */
212 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
213 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
214 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
215 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
216 else {
217 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
218 sm->key_mgmt);
219 os_free(buf);
220 return NULL;
221 }
222 pos += RSN_SELECTOR_LEN;
223
224 /* RSN Capabilities */
225 capab = 0;
226#ifdef CONFIG_IEEE80211W
227 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
0b60b0aa 228 capab |= WPA_CAPABILITY_MFPC;
6fc6879b
JM		 229#endif /* CONFIG_IEEE80211W */
230 WPA_PUT_LE16(pos, capab);
231 pos += 2;
232
233 /* PMKID Count */
234 WPA_PUT_LE16(pos, 1);
235 pos += 2;
236
237 /* PMKID List [PMKR0Name/PMKR1Name] */
238 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
239 pos += WPA_PMK_NAME_LEN;
240
241#ifdef CONFIG_IEEE80211W
242 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
243 /* Management Group Cipher Suite */
244 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
245 pos += RSN_SELECTOR_LEN;
246 }
247#endif /* CONFIG_IEEE80211W */
248
249 rsnie->len = (pos - (u8 *) rsnie) - 2;
250
251 /* MDIE */
252 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
253 *pos++ = sizeof(*mdie);
254 mdie = (struct rsn_mdie *) pos;
255 pos += sizeof(*mdie);
256 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
257 MOBILITY_DOMAIN_ID_LEN);
f4ec630d
JM		 258 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
259 sm->mdie_ft_capab;
6fc6879b 260
3db65314 261 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
ccfab35a 262 ftie_pos = pos;
6fc6879b
JM		 263 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
264 ftie_len = pos++;
265 ftie = (struct rsn_ftie *) pos;
266 pos += sizeof(*ftie);
267 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
268 if (anonce)
269 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
3db65314
JM		 270 if (kck) {
271 /* R1KH-ID sub-element in third FT message */
272 *pos++ = FTIE_SUBELEM_R1KH_ID;
273 *pos++ = FT_R1KH_ID_LEN;
274 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
275 pos += FT_R1KH_ID_LEN;
276 }
6fc6879b
JM		 277 /* R0KH-ID sub-element */
278 *pos++ = FTIE_SUBELEM_R0KH_ID;
279 *pos++ = sm->r0kh_id_len;
280 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
281 pos += sm->r0kh_id_len;
282 *ftie_len = pos - ftie_len - 1;
283
babfbf15
JM		 284 if (ric_ies) {
285 /* RIC Request */
286 os_memcpy(pos, ric_ies, ric_ies_len);
287 pos += ric_ies_len;
288 }
289
6fc6879b
JM		 290 if (kck) {
291 /*
c1e033b0 292 * IEEE Std 802.11r-2008, 11A.8.4
6fc6879b
JM		 293 * MIC shall be calculated over:
294 * non-AP STA MAC address
295 * Target AP MAC address
296 * Transaction seq number (5 for ReassocReq, 3 otherwise)
297 * RSN IE
298 * MDIE
299 * FTIE (with MIC field set to 0)
300 * RIC-Request (if present)
301 */
babfbf15
JM		 302 /* Information element count */
303 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
304 ric_ies_len);
6fc6879b
JM		 305 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
306 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
ccfab35a 307 ftie_pos, 2 + *ftie_len,
babfbf15
JM		 308 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
309 ric_ies_len, ftie->mic) < 0) {
6fc6879b
JM		 310 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
311 os_free(buf);
312 return NULL;
313 }
314 }
315
316 *len = pos - buf;
317
318 return buf;
319}
320
321
6fc6879b
JM		 322static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
323{
324 int keylen;
71934751 325 enum wpa_alg alg;
6fc6879b
JM		 326 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
327
328 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
329
330 switch (sm->pairwise_cipher) {
331 case WPA_CIPHER_CCMP:
332 alg = WPA_ALG_CCMP;
333 keylen = 16;
334 break;
eb7719ff
JM		 335 case WPA_CIPHER_GCMP:
336 alg = WPA_ALG_GCMP;
337 keylen = 16;
338 break;
6fc6879b
JM		 339 case WPA_CIPHER_TKIP:
340 alg = WPA_ALG_TKIP;
341 keylen = 32;
342 break;
343 default:
344 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
345 sm->pairwise_cipher);
346 return -1;
347 }
348
349 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
350 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
351 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
352 return -1;
353 }
354
355 return 0;
356}
357
358
359/**
360 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
361 * @sm: Pointer to WPA state machine data from wpa_sm_init()
76b7981d 362 * @mdie: Target AP MDIE
6fc6879b
JM		 363 * Returns: 0 on success, -1 on failure
364 */
76b7981d 365int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
6fc6879b
JM		 366{
367 u8 *ft_ies;
368 size_t ft_ies_len;
369
370 /* Generate a new SNonce */
3642c431 371 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
6fc6879b
JM		 372 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
373 return -1;
374 }
375
376 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
76b7981d 377 NULL, sm->bssid, NULL, 0, mdie);
6fc6879b
JM		 378 if (ft_ies) {
379 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
380 ft_ies, ft_ies_len);
381 os_free(ft_ies);
382 }
383
384 return 0;
385}
386
387
388int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
babfbf15
JM		 389 int ft_action, const u8 *target_ap,
390 const u8 *ric_ies, size_t ric_ies_len)
6fc6879b
JM		 391{
392 u8 *ft_ies;
c0a61908 393 size_t ft_ies_len, ptk_len;
6fc6879b
JM		 394 struct wpa_ft_ies parse;
395 struct rsn_mdie *mdie;
396 struct rsn_ftie *ftie;
397 u8 ptk_name[WPA_PMK_NAME_LEN];
398 int ret;
399 const u8 *bssid;
400
401 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
babfbf15 402 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
6fc6879b
JM		 403
404 if (ft_action) {
405 if (!sm->over_the_ds_in_progress) {
406 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
407 "- drop FT Action Response");
408 return -1;
409 }
410
411 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
412 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
413 "with this Target AP - drop FT Action "
414 "Response");
415 return -1;
416 }
417 }
418
419 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
420 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
421 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
422 "enabled for this connection");
423 return -1;
424 }
425
426 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
427 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
428 return -1;
429 }
430
431 mdie = (struct rsn_mdie *) parse.mdie;
432 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
433 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
434 MOBILITY_DOMAIN_ID_LEN) != 0) {
435 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
436 return -1;
437 }
438
439 ftie = (struct rsn_ftie *) parse.ftie;
440 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
441 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
442 return -1;
443 }
444
148fb67d
JM		 445 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
446 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
447 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
448 ftie->snonce, WPA_NONCE_LEN);
449 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
450 sm->snonce, WPA_NONCE_LEN);
451 return -1;
452 }
453
6fc6879b
JM		 454 if (parse.r0kh_id == NULL) {
455 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
456 return -1;
457 }
458
459 if (parse.r0kh_id_len != sm->r0kh_id_len ||
460 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
461 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
462 "the current R0KH-ID");
463 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
464 parse.r0kh_id, parse.r0kh_id_len);
465 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
466 sm->r0kh_id, sm->r0kh_id_len);
467 return -1;
468 }
469
470 if (parse.r1kh_id == NULL) {
471 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
472 return -1;
473 }
474
475 if (parse.rsn_pmkid == NULL ||
476 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
477 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
478 "RSNIE");
479 return -1;
480 }
481
482 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
483 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
484 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
485 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
148fb67d 486 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
6fc6879b
JM		 487 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
488 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
489 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
490 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
491 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
492
658d1662 493 bssid = target_ap;
eb7719ff 494 ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
6fc6879b
JM		 495 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
496 bssid, sm->pmk_r1_name,
c0a61908 497 (u8 *) &sm->ptk, ptk_len, ptk_name);
6fc6879b 498 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
c0a61908 499 (u8 *) &sm->ptk, ptk_len);
6fc6879b
JM		 500 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
501
502 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
babfbf15 503 sm->pmk_r1_name, sm->ptk.kck, bssid,
76b7981d
JM		 504 ric_ies, ric_ies_len,
505 parse.mdie ? parse.mdie - 2 : NULL);
6fc6879b
JM		 506 if (ft_ies) {
507 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
508 ft_ies, ft_ies_len);
509 os_free(ft_ies);
510 }
511
2a7e7f4e 512 wpa_sm_mark_authenticated(sm, bssid);
6fc6879b 513 ret = wpa_ft_install_ptk(sm, bssid);
86f7b62a
JM		 514 if (ret) {
515 /*
516 * Some drivers do not support key configuration when we are
517 * not associated with the target AP. Work around this by
518 * trying again after the following reassociation gets
519 * completed.
520 */
521 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
522 "association - try again after reassociation");
523 sm->set_ptk_after_assoc = 1;
524 } else
525 sm->set_ptk_after_assoc = 0;
6fc6879b 526
86f7b62a
JM		 527 sm->ft_completed = 1;
528 if (ft_action) {
529 /*
530 * The caller is expected trigger re-association with the
531 * Target AP.
532 */
533 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
6fc6879b
JM		 534 }
535
86f7b62a 536 return 0;
6fc6879b
JM		 537}
538
539
540int wpa_ft_is_completed(struct wpa_sm *sm)
541{
542 if (sm == NULL)
543 return 0;
544
545 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
546 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
547 return 0;
548
549 return sm->ft_completed;
550}
551
552
b27f13ed
JM		 553static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
554 size_t gtk_elem_len)
555{
556 u8 gtk[32];
557 int keyidx;
71934751 558 enum wpa_alg alg;
b27f13ed
JM		 559 size_t gtk_len, keylen, rsc_len;
560
561 if (gtk_elem == NULL) {
562 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
563 return 0;
564 }
565
566 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
567 gtk_elem, gtk_elem_len);
568
39eb4d08
JM		 569 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
570 gtk_elem_len - 19 > sizeof(gtk)) {
b27f13ed
JM		 571 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
572 "length %lu", (unsigned long) gtk_elem_len);
573 return -1;
574 }
39eb4d08
JM		 575 gtk_len = gtk_elem_len - 19;
576 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
b27f13ed
JM		 577 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
578 "decrypt GTK");
579 return -1;
580 }
581
582 switch (sm->group_cipher) {
583 case WPA_CIPHER_CCMP:
584 keylen = 16;
585 rsc_len = 6;
586 alg = WPA_ALG_CCMP;
587 break;
eb7719ff
JM		 588 case WPA_CIPHER_GCMP:
589 keylen = 16;
590 rsc_len = 6;
591 alg = WPA_ALG_GCMP;
592 break;
b27f13ed
JM		 593 case WPA_CIPHER_TKIP:
594 keylen = 32;
595 rsc_len = 6;
596 alg = WPA_ALG_TKIP;
597 break;
598 case WPA_CIPHER_WEP104:
599 keylen = 13;
600 rsc_len = 0;
601 alg = WPA_ALG_WEP;
602 break;
603 case WPA_CIPHER_WEP40:
604 keylen = 5;
605 rsc_len = 0;
606 alg = WPA_ALG_WEP;
607 break;
608 default:
609 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
610 sm->group_cipher);
611 return -1;
612 }
613
614 if (gtk_len < keylen) {
615 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
616 return -1;
617 }
618
39eb4d08 619 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
b27f13ed 620
39eb4d08 621 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
b27f13ed 622
39eb4d08 623 if (gtk_elem[2] != keylen) {
b27f13ed
JM		 624 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
625 "negotiated %lu",
39eb4d08 626 gtk_elem[2], (unsigned long) keylen);
b27f13ed
JM		 627 return -1;
628 }
629
630 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
0382097e
JM		 631 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
632 gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
b27f13ed
JM		 633 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
634 "driver.");
635 return -1;
636 }
637
638 return 0;
639}
640
641
642#ifdef CONFIG_IEEE80211W
643static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
644 size_t igtk_elem_len)
645{
646 u8 igtk[WPA_IGTK_LEN];
647 u16 keyidx;
648
649 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
650 return 0;
651
652 if (igtk_elem == NULL) {
653 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
654 return 0;
655 }
656
657 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
658 igtk_elem, igtk_elem_len);
659
ff89afb7 660 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
b27f13ed
JM		 661 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
662 "length %lu", (unsigned long) igtk_elem_len);
663 return -1;
664 }
ff89afb7
JM		 665 if (igtk_elem[8] != WPA_IGTK_LEN) {
666 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
667 "%d", igtk_elem[8]);
668 return -1;
669 }
670
671 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
b27f13ed
JM		 672 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
673 "decrypt IGTK");
674 return -1;
675 }
676
ff89afb7 677 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
b27f13ed
JM		 678
679 keyidx = WPA_GET_LE16(igtk_elem);
680
681 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
682 WPA_IGTK_LEN);
0382097e
JM		 683 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
684 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
b27f13ed
JM		 685 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
686 "driver.");
687 return -1;
688 }
689
690 return 0;
691}
692#endif /* CONFIG_IEEE80211W */
693
694
6fc6879b 695int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
658d1662 696 size_t ies_len, const u8 *src_addr)
6fc6879b
JM		 697{
698 struct wpa_ft_ies parse;
699 struct rsn_mdie *mdie;
700 struct rsn_ftie *ftie;
8aaf894d 701 unsigned int count;
6fc6879b 702 u8 mic[16];
6fc6879b
JM		 703
704 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
705
706 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
707 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
708 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
709 "enabled for this connection");
710 return -1;
711 }
712
713 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
714 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
715 return -1;
716 }
717
718 mdie = (struct rsn_mdie *) parse.mdie;
719 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
720 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
721 MOBILITY_DOMAIN_ID_LEN) != 0) {
722 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
723 return -1;
724 }
725
726 ftie = (struct rsn_ftie *) parse.ftie;
727 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
728 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
729 return -1;
730 }
731
148fb67d
JM		 732 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
733 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
734 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
735 ftie->snonce, WPA_NONCE_LEN);
736 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
737 sm->snonce, WPA_NONCE_LEN);
738 return -1;
739 }
740
741 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
742 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
743 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
744 ftie->anonce, WPA_NONCE_LEN);
745 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
746 sm->anonce, WPA_NONCE_LEN);
747 return -1;
748 }
749
6fc6879b
JM		 750 if (parse.r0kh_id == NULL) {
751 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
752 return -1;
753 }
754
755 if (parse.r0kh_id_len != sm->r0kh_id_len ||
756 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
757 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
758 "the current R0KH-ID");
759 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
760 parse.r0kh_id, parse.r0kh_id_len);
761 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
762 sm->r0kh_id, sm->r0kh_id_len);
763 return -1;
764 }
765
766 if (parse.r1kh_id == NULL) {
767 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
768 return -1;
769 }
770
771 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
772 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
773 "ReassocResp");
774 return -1;
775 }
776
777 if (parse.rsn_pmkid == NULL ||
778 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
779 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
780 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
781 return -1;
782 }
783
784 count = 3;
c284b461
HW		 785 if (parse.ric)
786 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
8aaf894d
JM		 787 if (ftie->mic_control[1] != count) {
788 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
789 "Control: received %u expected %u",
790 ftie->mic_control[1], count);
791 return -1;
792 }
6fc6879b 793
658d1662 794 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
6fc6879b
JM		 795 parse.mdie - 2, parse.mdie_len + 2,
796 parse.ftie - 2, parse.ftie_len + 2,
f238cf9f
JM		 797 parse.rsn - 2, parse.rsn_len + 2,
798 parse.ric, parse.ric_len,
6fc6879b
JM		 799 mic) < 0) {
800 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
801 return -1;
802 }
803
804 if (os_memcmp(mic, ftie->mic, 16) != 0) {
805 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
806 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
807 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
808 return -1;
809 }
810
b27f13ed 811 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
6fc6879b 812 return -1;
6fc6879b 813
b27f13ed
JM		 814#ifdef CONFIG_IEEE80211W
815 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
6fc6879b 816 return -1;
b27f13ed 817#endif /* CONFIG_IEEE80211W */
6fc6879b 818
86f7b62a
JM		 819 if (sm->set_ptk_after_assoc) {
820 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
821 "are associated");
822 if (wpa_ft_install_ptk(sm, src_addr) < 0)
823 return -1;
824 sm->set_ptk_after_assoc = 0;
825 }
826
f238cf9f
JM		 827 if (parse.ric) {
828 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
829 parse.ric, parse.ric_len);
830 /* TODO: parse response and inform driver about results */
831 }
832
6fc6879b
JM		 833 return 0;
834}
835
836
837/**
838 * wpa_ft_start_over_ds - Generate over-the-DS auth request
839 * @sm: Pointer to WPA state machine data from wpa_sm_init()
76b7981d
JM		 840 * @target_ap: Target AP Address
841 * @mdie: Mobility Domain IE from the target AP
6fc6879b
JM		 842 * Returns: 0 on success, -1 on failure
843 */
76b7981d
JM		 844int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
845 const u8 *mdie)
6fc6879b
JM		 846{
847 u8 *ft_ies;
848 size_t ft_ies_len;
849
850 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
851 MAC2STR(target_ap));
852
853 /* Generate a new SNonce */
3642c431 854 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
6fc6879b
JM		 855 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
856 return -1;
857 }
858
859 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
76b7981d 860 NULL, target_ap, NULL, 0, mdie);
6fc6879b
JM		 861 if (ft_ies) {
862 sm->over_the_ds_in_progress = 1;
863 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
864 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
865 os_free(ft_ies);
866 }
867
868 return 0;
869}
870
871#endif /* CONFIG_IEEE80211R */
Unnamed repository; edit this file 'description' to name the repository.