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Make CENTER_FRQ1 available independently in SIGNAL_POLL
[thirdparty/hostap.git] / src / rsn_supp / wpa_ft.c
CommitLineData
6fc6879b
JM		 1/*
2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
98cd3d1c 3 * Copyright (c) 2006-2015, Jouni Malinen <j@w1.fi>
6fc6879b 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,
98cd3d1c 22 const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
6fc6879b 23{
6fc6879b
JM		 24 u8 ptk_name[WPA_PMK_NAME_LEN];
25 const u8 *anonce = key->key_nonce;
26
27 if (sm->xxkey_len == 0) {
28 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
29 "derivation");
30 return -1;
31 }
32
33 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
34 sm->ssid_len, sm->mobility_domain,
35 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
36 sm->pmk_r0, sm->pmk_r0_name);
37 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
38 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
39 sm->pmk_r0_name, WPA_PMK_NAME_LEN);
40 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
26e23750 41 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
6fc6879b 42 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
26e23750
JM		 43 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
44 WPA_PMK_NAME_LEN);
98cd3d1c
JM		 45 return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
46 sm->bssid, sm->pmk_r1_name, ptk, ptk_name,
47 sm->key_mgmt, sm->pairwise_cipher);
6fc6879b
JM		 48}
49
50
51/**
52 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
53 * @sm: Pointer to WPA state machine data from wpa_sm_init()
e7846b68
JM		 54 * @ies: Association Response IEs or %NULL to clear FT parameters
55 * @ies_len: Length of ies buffer in octets
6fc6879b
JM		 56 * Returns: 0 on success, -1 on failure
57 */
e7846b68 58int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
6fc6879b 59{
e7846b68
JM		 60 struct wpa_ft_ies ft;
61
62 if (sm == NULL)
63 return 0;
64
65 if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0)
66 return -1;
67
68 if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
69 return -1;
70
71 if (ft.mdie) {
6fc6879b 72 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
e7846b68
JM		 73 ft.mdie, MOBILITY_DOMAIN_ID_LEN);
74 os_memcpy(sm->mobility_domain, ft.mdie,
6fc6879b 75 MOBILITY_DOMAIN_ID_LEN);
e7846b68 76 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
f4ec630d
JM		 77 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
78 sm->mdie_ft_capab);
e7846b68 79 } else
6fc6879b
JM		 80 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
81
e7846b68
JM		 82 if (ft.r0kh_id) {
83 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
84 ft.r0kh_id, ft.r0kh_id_len);
85 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
86 sm->r0kh_id_len = ft.r0kh_id_len;
87 } else {
6fc6879b
JM		 88 /* FIX: When should R0KH-ID be cleared? We need to keep the
89 * old R0KH-ID in order to be able to use this during FT. */
90 /*
91 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
92 * sm->r0kh_id_len = 0;
93 */
94 }
95
e7846b68
JM		 96 if (ft.r1kh_id) {
97 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
98 ft.r1kh_id, FT_R1KH_ID_LEN);
99 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
100 } else
6fc6879b
JM		 101 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
102
55046414
JM		 103 os_free(sm->assoc_resp_ies);
104 sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
105 if (sm->assoc_resp_ies) {
106 u8 *pos = sm->assoc_resp_ies;
107 if (ft.mdie) {
108 os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
109 pos += ft.mdie_len + 2;
110 }
111 if (ft.ftie) {
112 os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
113 pos += ft.ftie_len + 2;
114 }
115 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
116 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
117 "(Re)Association Response",
118 sm->assoc_resp_ies, sm->assoc_resp_ies_len);
119 }
120
6fc6879b
JM		 121 return 0;
122}
123
124
125/**
babfbf15 126 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
6fc6879b
JM		 127 * @sm: Pointer to WPA state machine data from wpa_sm_init()
128 * @len: Buffer for returning the length of the IEs
129 * @anonce: ANonce or %NULL if not yet available
130 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
131 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
98cd3d1c 132 * @kck_len: KCK length in octets
6fc6879b 133 * @target_ap: Target AP address
babfbf15
JM		 134 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
135 * @ric_ies_len: Length of ric_ies buffer in octets
76b7981d 136 * @ap_mdie: Mobility Domain IE from the target AP
6fc6879b
JM		 137 * Returns: Pointer to buffer with IEs or %NULL on failure
138 *
139 * Caller is responsible for freeing the returned buffer with os_free();
140 */
141static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
142 const u8 *anonce, const u8 *pmk_name,
98cd3d1c
JM		 143 const u8 *kck, size_t kck_len,
144 const u8 *target_ap,
76b7981d
JM		 145 const u8 *ric_ies, size_t ric_ies_len,
146 const u8 *ap_mdie)
6fc6879b
JM		 147{
148 size_t buf_len;
ccfab35a 149 u8 *buf, *pos, *ftie_len, *ftie_pos;
6fc6879b
JM		 150 struct rsn_mdie *mdie;
151 struct rsn_ftie *ftie;
152 struct rsn_ie_hdr *rsnie;
153 u16 capab;
154
155 sm->ft_completed = 0;
2a9c5217 156 sm->ft_reassoc_completed = 0;
6fc6879b
JM		 157
158 buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
babfbf15 159 2 + sm->r0kh_id_len + ric_ies_len + 100;
6fc6879b
JM		 160 buf = os_zalloc(buf_len);
161 if (buf == NULL)
162 return NULL;
163 pos = buf;
164
babfbf15 165 /* RSNIE[PMKR0Name/PMKR1Name] */
6fc6879b
JM		 166 rsnie = (struct rsn_ie_hdr *) pos;
167 rsnie->elem_id = WLAN_EID_RSN;
168 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
169 pos = (u8 *) (rsnie + 1);
170
171 /* Group Suite Selector */
05a90d78 172 if (!wpa_cipher_valid_group(sm->group_cipher)) {
6fc6879b
JM		 173 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
174 sm->group_cipher);
175 os_free(buf);
176 return NULL;
177 }
c3550295
JM		 178 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
179 sm->group_cipher));
6fc6879b
JM		 180 pos += RSN_SELECTOR_LEN;
181
182 /* Pairwise Suite Count */
183 WPA_PUT_LE16(pos, 1);
184 pos += 2;
185
186 /* Pairwise Suite List */
c3550295 187 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
6fc6879b
JM		 188 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
189 sm->pairwise_cipher);
190 os_free(buf);
191 return NULL;
192 }
c3550295
JM		 193 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
194 sm->pairwise_cipher));
6fc6879b
JM		 195 pos += RSN_SELECTOR_LEN;
196
197 /* Authenticated Key Management Suite Count */
198 WPA_PUT_LE16(pos, 1);
199 pos += 2;
200
201 /* Authenticated Key Management Suite List */
202 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
203 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
204 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
205 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
aa189ac9
JM		 206 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
207 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
5aa08153
JM		 208#ifdef CONFIG_FILS
209 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA256)
210 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA256);
211 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_FILS_SHA384)
212 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_FILS_SHA384);
213#endif /* CONFIG_FILS */
6fc6879b
JM		 214 else {
215 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
216 sm->key_mgmt);
217 os_free(buf);
218 return NULL;
219 }
220 pos += RSN_SELECTOR_LEN;
221
222 /* RSN Capabilities */
223 capab = 0;
224#ifdef CONFIG_IEEE80211W
225 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
0b60b0aa 226 capab |= WPA_CAPABILITY_MFPC;
6fc6879b
JM		 227#endif /* CONFIG_IEEE80211W */
228 WPA_PUT_LE16(pos, capab);
229 pos += 2;
230
231 /* PMKID Count */
232 WPA_PUT_LE16(pos, 1);
233 pos += 2;
234
235 /* PMKID List [PMKR0Name/PMKR1Name] */
236 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
237 pos += WPA_PMK_NAME_LEN;
238
239#ifdef CONFIG_IEEE80211W
240 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
241 /* Management Group Cipher Suite */
242 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
243 pos += RSN_SELECTOR_LEN;
244 }
245#endif /* CONFIG_IEEE80211W */
246
247 rsnie->len = (pos - (u8 *) rsnie) - 2;
248
249 /* MDIE */
250 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
251 *pos++ = sizeof(*mdie);
252 mdie = (struct rsn_mdie *) pos;
253 pos += sizeof(*mdie);
254 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
255 MOBILITY_DOMAIN_ID_LEN);
f4ec630d
JM		 256 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
257 sm->mdie_ft_capab;
6fc6879b 258
3db65314 259 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
ccfab35a 260 ftie_pos = pos;
6fc6879b
JM		 261 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
262 ftie_len = pos++;
263 ftie = (struct rsn_ftie *) pos;
264 pos += sizeof(*ftie);
265 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
266 if (anonce)
267 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
3db65314
JM		 268 if (kck) {
269 /* R1KH-ID sub-element in third FT message */
270 *pos++ = FTIE_SUBELEM_R1KH_ID;
271 *pos++ = FT_R1KH_ID_LEN;
272 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
273 pos += FT_R1KH_ID_LEN;
274 }
6fc6879b
JM		 275 /* R0KH-ID sub-element */
276 *pos++ = FTIE_SUBELEM_R0KH_ID;
277 *pos++ = sm->r0kh_id_len;
278 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
279 pos += sm->r0kh_id_len;
280 *ftie_len = pos - ftie_len - 1;
281
babfbf15
JM		 282 if (ric_ies) {
283 /* RIC Request */
284 os_memcpy(pos, ric_ies, ric_ies_len);
285 pos += ric_ies_len;
286 }
287
6fc6879b
JM		 288 if (kck) {
289 /*
c1e033b0 290 * IEEE Std 802.11r-2008, 11A.8.4
6fc6879b
JM		 291 * MIC shall be calculated over:
292 * non-AP STA MAC address
293 * Target AP MAC address
294 * Transaction seq number (5 for ReassocReq, 3 otherwise)
295 * RSN IE
296 * MDIE
297 * FTIE (with MIC field set to 0)
298 * RIC-Request (if present)
299 */
babfbf15
JM		 300 /* Information element count */
301 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
302 ric_ies_len);
98cd3d1c 303 if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5,
6fc6879b 304 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
ccfab35a 305 ftie_pos, 2 + *ftie_len,
babfbf15
JM		 306 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
307 ric_ies_len, ftie->mic) < 0) {
6fc6879b
JM		 308 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
309 os_free(buf);
310 return NULL;
311 }
312 }
313
314 *len = pos - buf;
315
316 return buf;
317}
318
319
6fc6879b
JM		 320static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
321{
322 int keylen;
71934751 323 enum wpa_alg alg;
6fc6879b
JM		 324 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
325
326 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
327
c3550295 328 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
6fc6879b
JM		 329 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
330 sm->pairwise_cipher);
331 return -1;
332 }
333
c3550295
JM		 334 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
335 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
336
6fc6879b 337 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
98cd3d1c 338 sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen) < 0) {
6fc6879b
JM		 339 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
340 return -1;
341 }
342
343 return 0;
344}
345
346
347/**
348 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
349 * @sm: Pointer to WPA state machine data from wpa_sm_init()
76b7981d 350 * @mdie: Target AP MDIE
6fc6879b
JM		 351 * Returns: 0 on success, -1 on failure
352 */
76b7981d 353int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
6fc6879b
JM		 354{
355 u8 *ft_ies;
356 size_t ft_ies_len;
357
358 /* Generate a new SNonce */
3642c431 359 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
6fc6879b
JM		 360 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
361 return -1;
362 }
363
364 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
98cd3d1c 365 NULL, 0, sm->bssid, NULL, 0, mdie);
6fc6879b
JM		 366 if (ft_ies) {
367 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
368 ft_ies, ft_ies_len);
369 os_free(ft_ies);
370 }
371
372 return 0;
373}
374
375
376int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
babfbf15
JM		 377 int ft_action, const u8 *target_ap,
378 const u8 *ric_ies, size_t ric_ies_len)
6fc6879b
JM		 379{
380 u8 *ft_ies;
98cd3d1c 381 size_t ft_ies_len;
6fc6879b
JM		 382 struct wpa_ft_ies parse;
383 struct rsn_mdie *mdie;
384 struct rsn_ftie *ftie;
385 u8 ptk_name[WPA_PMK_NAME_LEN];
386 int ret;
387 const u8 *bssid;
2f373878
JM		 388 const u8 *kck;
389 size_t kck_len;
6fc6879b
JM		 390
391 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
babfbf15 392 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
6fc6879b
JM		 393
394 if (ft_action) {
395 if (!sm->over_the_ds_in_progress) {
396 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
397 "- drop FT Action Response");
398 return -1;
399 }
400
401 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
402 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
403 "with this Target AP - drop FT Action "
404 "Response");
405 return -1;
406 }
407 }
408
aa189ac9 409 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
6fc6879b
JM		 410 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
411 "enabled for this connection");
412 return -1;
413 }
414
415 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
416 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
417 return -1;
418 }
419
420 mdie = (struct rsn_mdie *) parse.mdie;
421 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
422 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
423 MOBILITY_DOMAIN_ID_LEN) != 0) {
424 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
425 return -1;
426 }
427
428 ftie = (struct rsn_ftie *) parse.ftie;
429 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
430 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
431 return -1;
432 }
433
148fb67d
JM		 434 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
435 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
436 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
437 ftie->snonce, WPA_NONCE_LEN);
438 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
439 sm->snonce, WPA_NONCE_LEN);
440 return -1;
441 }
442
6fc6879b
JM		 443 if (parse.r0kh_id == NULL) {
444 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
445 return -1;
446 }
447
448 if (parse.r0kh_id_len != sm->r0kh_id_len ||
0d15b69f
JM		 449 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
450 {
6fc6879b
JM		 451 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
452 "the current R0KH-ID");
453 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
454 parse.r0kh_id, parse.r0kh_id_len);
455 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
456 sm->r0kh_id, sm->r0kh_id_len);
457 return -1;
458 }
459
460 if (parse.r1kh_id == NULL) {
461 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
462 return -1;
463 }
464
465 if (parse.rsn_pmkid == NULL ||
0d15b69f
JM		 466 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN))
467 {
6fc6879b
JM		 468 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
469 "RSNIE");
470 return -1;
471 }
472
473 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
474 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
475 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
476 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
148fb67d 477 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
6fc6879b
JM		 478 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
479 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
480 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
481 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
482 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
483
658d1662 484 bssid = target_ap;
98cd3d1c
JM		 485 if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce,
486 sm->own_addr, bssid, sm->pmk_r1_name, &sm->ptk,
487 ptk_name, sm->key_mgmt, sm->pairwise_cipher) < 0)
488 return -1;
6fc6879b 489
2f373878
JM		 490 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
491 kck = sm->ptk.kck2;
492 kck_len = sm->ptk.kck2_len;
493 } else {
494 kck = sm->ptk.kck;
495 kck_len = sm->ptk.kck_len;
496 }
6fc6879b 497 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
98cd3d1c 498 sm->pmk_r1_name,
2f373878 499 kck, kck_len, bssid,
76b7981d
JM		 500 ric_ies, ric_ies_len,
501 parse.mdie ? parse.mdie - 2 : NULL);
6fc6879b
JM		 502 if (ft_ies) {
503 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
504 ft_ies, ft_ies_len);
505 os_free(ft_ies);
506 }
507
2a7e7f4e 508 wpa_sm_mark_authenticated(sm, bssid);
6fc6879b 509 ret = wpa_ft_install_ptk(sm, bssid);
86f7b62a
JM		 510 if (ret) {
511 /*
512 * Some drivers do not support key configuration when we are
513 * not associated with the target AP. Work around this by
514 * trying again after the following reassociation gets
515 * completed.
516 */
517 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
518 "association - try again after reassociation");
519 sm->set_ptk_after_assoc = 1;
520 } else
521 sm->set_ptk_after_assoc = 0;
6fc6879b 522
86f7b62a
JM		 523 sm->ft_completed = 1;
524 if (ft_action) {
525 /*
526 * The caller is expected trigger re-association with the
527 * Target AP.
528 */
529 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
6fc6879b
JM		 530 }
531
86f7b62a 532 return 0;
6fc6879b
JM		 533}
534
535
536int wpa_ft_is_completed(struct wpa_sm *sm)
537{
538 if (sm == NULL)
539 return 0;
540
aa189ac9 541 if (!wpa_key_mgmt_ft(sm->key_mgmt))
6fc6879b
JM		 542 return 0;
543
544 return sm->ft_completed;
545}
546
547
02db75b6
DG		 548void wpa_reset_ft_completed(struct wpa_sm *sm)
549{
550 if (sm != NULL)
551 sm->ft_completed = 0;
552}
553
554
b27f13ed
JM		 555static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
556 size_t gtk_elem_len)
557{
558 u8 gtk[32];
559 int keyidx;
71934751 560 enum wpa_alg alg;
b27f13ed
JM		 561 size_t gtk_len, keylen, rsc_len;
562
563 if (gtk_elem == NULL) {
564 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
565 return 0;
566 }
567
568 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
569 gtk_elem, gtk_elem_len);
570
39eb4d08
JM		 571 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
572 gtk_elem_len - 19 > sizeof(gtk)) {
b27f13ed
JM		 573 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
574 "length %lu", (unsigned long) gtk_elem_len);
575 return -1;
576 }
39eb4d08 577 gtk_len = gtk_elem_len - 19;
98cd3d1c
JM		 578 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, gtk_len / 8, gtk_elem + 11,
579 gtk)) {
b27f13ed
JM		 580 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
581 "decrypt GTK");
582 return -1;
583 }
584
c3550295
JM		 585 keylen = wpa_cipher_key_len(sm->group_cipher);
586 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
587 alg = wpa_cipher_to_alg(sm->group_cipher);
588 if (alg == WPA_ALG_NONE) {
b27f13ed
JM		 589 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
590 sm->group_cipher);
591 return -1;
592 }
593
594 if (gtk_len < keylen) {
595 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
596 return -1;
597 }
598
39eb4d08 599 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
b27f13ed 600
39eb4d08 601 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
b27f13ed 602
39eb4d08 603 if (gtk_elem[2] != keylen) {
b27f13ed
JM		 604 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
605 "negotiated %lu",
39eb4d08 606 gtk_elem[2], (unsigned long) keylen);
b27f13ed
JM		 607 return -1;
608 }
609
610 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
b54c9ff9
JM		 611 if (sm->group_cipher == WPA_CIPHER_TKIP) {
612 /* Swap Tx/Rx keys for Michael MIC */
613 u8 tmp[8];
614 os_memcpy(tmp, gtk + 16, 8);
615 os_memcpy(gtk + 16, gtk + 24, 8);
616 os_memcpy(gtk + 24, tmp, 8);
617 }
0382097e
JM		 618 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
619 gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
b27f13ed
JM		 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
630static 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
ff89afb7 647 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
b27f13ed
JM		 648 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
649 "length %lu", (unsigned long) igtk_elem_len);
650 return -1;
651 }
ff89afb7
JM		 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
98cd3d1c
JM		 658 if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, WPA_IGTK_LEN / 8,
659 igtk_elem + 9, igtk)) {
b27f13ed
JM		 660 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
661 "decrypt IGTK");
662 return -1;
663 }
664
ff89afb7 665 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
b27f13ed
JM		 666
667 keyidx = WPA_GET_LE16(igtk_elem);
668
669 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
670 WPA_IGTK_LEN);
0382097e
JM		 671 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
672 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
b27f13ed
JM		 673 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
674 "driver.");
675 return -1;
676 }
677
678 return 0;
679}
680#endif /* CONFIG_IEEE80211W */
681
682
6fc6879b 683int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
658d1662 684 size_t ies_len, const u8 *src_addr)
6fc6879b
JM		 685{
686 struct wpa_ft_ies parse;
687 struct rsn_mdie *mdie;
688 struct rsn_ftie *ftie;
8aaf894d 689 unsigned int count;
98cd3d1c 690 u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
2f373878
JM		 691 const u8 *kck;
692 size_t kck_len;
6fc6879b
JM		 693
694 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
695
aa189ac9 696 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
6fc6879b
JM		 697 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
698 "enabled for this connection");
699 return -1;
700 }
701
2a9c5217
JM		 702 if (sm->ft_reassoc_completed) {
703 wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
704 return 0;
705 }
706
6fc6879b
JM		 707 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
708 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
709 return -1;
710 }
711
712 mdie = (struct rsn_mdie *) parse.mdie;
713 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
714 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
715 MOBILITY_DOMAIN_ID_LEN) != 0) {
716 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
717 return -1;
718 }
719
720 ftie = (struct rsn_ftie *) parse.ftie;
721 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
722 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
723 return -1;
724 }
725
148fb67d
JM		 726 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
727 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
728 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
729 ftie->snonce, WPA_NONCE_LEN);
730 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
731 sm->snonce, WPA_NONCE_LEN);
732 return -1;
733 }
734
735 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
736 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
737 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
738 ftie->anonce, WPA_NONCE_LEN);
739 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
740 sm->anonce, WPA_NONCE_LEN);
741 return -1;
742 }
743
6fc6879b
JM		 744 if (parse.r0kh_id == NULL) {
745 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
746 return -1;
747 }
748
749 if (parse.r0kh_id_len != sm->r0kh_id_len ||
0d15b69f
JM		 750 os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0)
751 {
6fc6879b
JM		 752 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
753 "the current R0KH-ID");
754 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
755 parse.r0kh_id, parse.r0kh_id_len);
756 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
757 sm->r0kh_id, sm->r0kh_id_len);
758 return -1;
759 }
760
761 if (parse.r1kh_id == NULL) {
762 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
763 return -1;
764 }
765
0d15b69f 766 if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
6fc6879b
JM		 767 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
768 "ReassocResp");
769 return -1;
770 }
771
772 if (parse.rsn_pmkid == NULL ||
0d15b69f
JM		 773 os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN))
774 {
6fc6879b
JM		 775 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
776 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
777 return -1;
778 }
779
780 count = 3;
c284b461
HW		 781 if (parse.ric)
782 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
8aaf894d
JM		 783 if (ftie->mic_control[1] != count) {
784 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
785 "Control: received %u expected %u",
786 ftie->mic_control[1], count);
787 return -1;
788 }
6fc6879b 789
2f373878
JM		 790 if (wpa_key_mgmt_fils(sm->key_mgmt)) {
791 kck = sm->ptk.kck2;
792 kck_len = sm->ptk.kck2_len;
793 } else {
794 kck = sm->ptk.kck;
795 kck_len = sm->ptk.kck_len;
796 }
797
798 if (wpa_ft_mic(kck, kck_len, sm->own_addr, src_addr, 6,
6fc6879b
JM		 799 parse.mdie - 2, parse.mdie_len + 2,
800 parse.ftie - 2, parse.ftie_len + 2,
f238cf9f
JM		 801 parse.rsn - 2, parse.rsn_len + 2,
802 parse.ric, parse.ric_len,
6fc6879b
JM		 803 mic) < 0) {
804 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
805 return -1;
806 }
807
0d15b69f 808 if (os_memcmp_const(mic, ftie->mic, 16) != 0) {
6fc6879b
JM		 809 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
810 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
811 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
812 return -1;
813 }
814
2a9c5217
JM		 815 sm->ft_reassoc_completed = 1;
816
b27f13ed 817 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
6fc6879b 818 return -1;
6fc6879b 819
b27f13ed
JM		 820#ifdef CONFIG_IEEE80211W
821 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
6fc6879b 822 return -1;
b27f13ed 823#endif /* CONFIG_IEEE80211W */
6fc6879b 824
86f7b62a
JM		 825 if (sm->set_ptk_after_assoc) {
826 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
827 "are associated");
828 if (wpa_ft_install_ptk(sm, src_addr) < 0)
829 return -1;
830 sm->set_ptk_after_assoc = 0;
831 }
832
f238cf9f
JM		 833 if (parse.ric) {
834 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
835 parse.ric, parse.ric_len);
6a1ce395
DG		 836 /* TODO: parse response and inform driver about results when
837 * using wpa_supplicant SME */
f238cf9f
JM		 838 }
839
6a1ce395
DG		 840 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
841
6fc6879b
JM		 842 return 0;
843}
844
845
846/**
847 * wpa_ft_start_over_ds - Generate over-the-DS auth request
848 * @sm: Pointer to WPA state machine data from wpa_sm_init()
76b7981d
JM		 849 * @target_ap: Target AP Address
850 * @mdie: Mobility Domain IE from the target AP
6fc6879b
JM		 851 * Returns: 0 on success, -1 on failure
852 */
76b7981d
JM		 853int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
854 const u8 *mdie)
6fc6879b
JM		 855{
856 u8 *ft_ies;
857 size_t ft_ies_len;
858
859 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
860 MAC2STR(target_ap));
861
862 /* Generate a new SNonce */
3642c431 863 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
6fc6879b
JM		 864 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
865 return -1;
866 }
867
868 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
98cd3d1c 869 NULL, 0, target_ap, NULL, 0, mdie);
6fc6879b
JM		 870 if (ft_ies) {
871 sm->over_the_ds_in_progress = 1;
872 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
873 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
874 os_free(ft_ies);
875 }
876
877 return 0;
878}
879
880#endif /* CONFIG_IEEE80211R */
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