]> 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
tests: WPA2-Enterprise with PMF required
[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 */
c3550295
JM		 174 if (sm->group_cipher != WPA_CIPHER_CCMP &&
175 sm->group_cipher != WPA_CIPHER_GCMP &&
176 sm->group_cipher != WPA_CIPHER_TKIP) {
6fc6879b
JM		 177 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
178 sm->group_cipher);
179 os_free(buf);
180 return NULL;
181 }
c3550295
JM		 182 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
183 sm->group_cipher));
6fc6879b
JM		 184 pos += RSN_SELECTOR_LEN;
185
186 /* Pairwise Suite Count */
187 WPA_PUT_LE16(pos, 1);
188 pos += 2;
189
190 /* Pairwise Suite List */
c3550295 191 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
6fc6879b
JM		 192 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
193 sm->pairwise_cipher);
194 os_free(buf);
195 return NULL;
196 }
c3550295
JM		 197 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
198 sm->pairwise_cipher));
6fc6879b
JM		 199 pos += RSN_SELECTOR_LEN;
200
201 /* Authenticated Key Management Suite Count */
202 WPA_PUT_LE16(pos, 1);
203 pos += 2;
204
205 /* Authenticated Key Management Suite List */
206 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
207 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
208 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
209 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
210 else {
211 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
212 sm->key_mgmt);
213 os_free(buf);
214 return NULL;
215 }
216 pos += RSN_SELECTOR_LEN;
217
218 /* RSN Capabilities */
219 capab = 0;
220#ifdef CONFIG_IEEE80211W
221 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
0b60b0aa 222 capab |= WPA_CAPABILITY_MFPC;
6fc6879b
JM		 223#endif /* CONFIG_IEEE80211W */
224 WPA_PUT_LE16(pos, capab);
225 pos += 2;
226
227 /* PMKID Count */
228 WPA_PUT_LE16(pos, 1);
229 pos += 2;
230
231 /* PMKID List [PMKR0Name/PMKR1Name] */
232 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
233 pos += WPA_PMK_NAME_LEN;
234
235#ifdef CONFIG_IEEE80211W
236 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
237 /* Management Group Cipher Suite */
238 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
239 pos += RSN_SELECTOR_LEN;
240 }
241#endif /* CONFIG_IEEE80211W */
242
243 rsnie->len = (pos - (u8 *) rsnie) - 2;
244
245 /* MDIE */
246 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
247 *pos++ = sizeof(*mdie);
248 mdie = (struct rsn_mdie *) pos;
249 pos += sizeof(*mdie);
250 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
251 MOBILITY_DOMAIN_ID_LEN);
f4ec630d
JM		 252 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
253 sm->mdie_ft_capab;
6fc6879b 254
3db65314 255 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
ccfab35a 256 ftie_pos = pos;
6fc6879b
JM		 257 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
258 ftie_len = pos++;
259 ftie = (struct rsn_ftie *) pos;
260 pos += sizeof(*ftie);
261 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
262 if (anonce)
263 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
3db65314
JM		 264 if (kck) {
265 /* R1KH-ID sub-element in third FT message */
266 *pos++ = FTIE_SUBELEM_R1KH_ID;
267 *pos++ = FT_R1KH_ID_LEN;
268 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
269 pos += FT_R1KH_ID_LEN;
270 }
6fc6879b
JM		 271 /* R0KH-ID sub-element */
272 *pos++ = FTIE_SUBELEM_R0KH_ID;
273 *pos++ = sm->r0kh_id_len;
274 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
275 pos += sm->r0kh_id_len;
276 *ftie_len = pos - ftie_len - 1;
277
babfbf15
JM		 278 if (ric_ies) {
279 /* RIC Request */
280 os_memcpy(pos, ric_ies, ric_ies_len);
281 pos += ric_ies_len;
282 }
283
6fc6879b
JM		 284 if (kck) {
285 /*
c1e033b0 286 * IEEE Std 802.11r-2008, 11A.8.4
6fc6879b
JM		 287 * MIC shall be calculated over:
288 * non-AP STA MAC address
289 * Target AP MAC address
290 * Transaction seq number (5 for ReassocReq, 3 otherwise)
291 * RSN IE
292 * MDIE
293 * FTIE (with MIC field set to 0)
294 * RIC-Request (if present)
295 */
babfbf15
JM		 296 /* Information element count */
297 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
298 ric_ies_len);
6fc6879b
JM		 299 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
300 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
ccfab35a 301 ftie_pos, 2 + *ftie_len,
babfbf15
JM		 302 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
303 ric_ies_len, ftie->mic) < 0) {
6fc6879b
JM		 304 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
305 os_free(buf);
306 return NULL;
307 }
308 }
309
310 *len = pos - buf;
311
312 return buf;
313}
314
315
6fc6879b
JM		 316static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
317{
318 int keylen;
71934751 319 enum wpa_alg alg;
6fc6879b
JM		 320 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
321
322 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
323
c3550295 324 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
6fc6879b
JM		 325 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
326 sm->pairwise_cipher);
327 return -1;
328 }
329
c3550295
JM		 330 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
331 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
332
6fc6879b
JM		 333 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
334 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
335 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
336 return -1;
337 }
338
339 return 0;
340}
341
342
343/**
344 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
345 * @sm: Pointer to WPA state machine data from wpa_sm_init()
76b7981d 346 * @mdie: Target AP MDIE
6fc6879b
JM		 347 * Returns: 0 on success, -1 on failure
348 */
76b7981d 349int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
6fc6879b
JM		 350{
351 u8 *ft_ies;
352 size_t ft_ies_len;
353
354 /* Generate a new SNonce */
3642c431 355 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
6fc6879b
JM		 356 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
357 return -1;
358 }
359
360 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
76b7981d 361 NULL, sm->bssid, NULL, 0, mdie);
6fc6879b
JM		 362 if (ft_ies) {
363 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
364 ft_ies, ft_ies_len);
365 os_free(ft_ies);
366 }
367
368 return 0;
369}
370
371
372int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
babfbf15
JM		 373 int ft_action, const u8 *target_ap,
374 const u8 *ric_ies, size_t ric_ies_len)
6fc6879b
JM		 375{
376 u8 *ft_ies;
c0a61908 377 size_t ft_ies_len, ptk_len;
6fc6879b
JM		 378 struct wpa_ft_ies parse;
379 struct rsn_mdie *mdie;
380 struct rsn_ftie *ftie;
381 u8 ptk_name[WPA_PMK_NAME_LEN];
382 int ret;
383 const u8 *bssid;
384
385 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
babfbf15 386 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
6fc6879b
JM		 387
388 if (ft_action) {
389 if (!sm->over_the_ds_in_progress) {
390 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
391 "- drop FT Action Response");
392 return -1;
393 }
394
395 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
396 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
397 "with this Target AP - drop FT Action "
398 "Response");
399 return -1;
400 }
401 }
402
403 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
404 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
405 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
406 "enabled for this connection");
407 return -1;
408 }
409
410 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
411 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
412 return -1;
413 }
414
415 mdie = (struct rsn_mdie *) parse.mdie;
416 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
417 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
418 MOBILITY_DOMAIN_ID_LEN) != 0) {
419 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
420 return -1;
421 }
422
423 ftie = (struct rsn_ftie *) parse.ftie;
424 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
425 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
426 return -1;
427 }
428
148fb67d
JM		 429 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
430 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
431 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
432 ftie->snonce, WPA_NONCE_LEN);
433 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
434 sm->snonce, WPA_NONCE_LEN);
435 return -1;
436 }
437
6fc6879b
JM		 438 if (parse.r0kh_id == NULL) {
439 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
440 return -1;
441 }
442
443 if (parse.r0kh_id_len != sm->r0kh_id_len ||
444 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
445 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
446 "the current R0KH-ID");
447 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
448 parse.r0kh_id, parse.r0kh_id_len);
449 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
450 sm->r0kh_id, sm->r0kh_id_len);
451 return -1;
452 }
453
454 if (parse.r1kh_id == NULL) {
455 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
456 return -1;
457 }
458
459 if (parse.rsn_pmkid == NULL ||
460 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
461 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
462 "RSNIE");
463 return -1;
464 }
465
466 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
467 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
468 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
469 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
148fb67d 470 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
6fc6879b
JM		 471 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
472 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
473 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
474 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
475 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
476
658d1662 477 bssid = target_ap;
eb7719ff 478 ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
6fc6879b
JM		 479 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
480 bssid, sm->pmk_r1_name,
c0a61908 481 (u8 *) &sm->ptk, ptk_len, ptk_name);
6fc6879b 482 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
c0a61908 483 (u8 *) &sm->ptk, ptk_len);
6fc6879b
JM		 484 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
485
486 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
babfbf15 487 sm->pmk_r1_name, sm->ptk.kck, bssid,
76b7981d
JM		 488 ric_ies, ric_ies_len,
489 parse.mdie ? parse.mdie - 2 : NULL);
6fc6879b
JM		 490 if (ft_ies) {
491 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
492 ft_ies, ft_ies_len);
493 os_free(ft_ies);
494 }
495
2a7e7f4e 496 wpa_sm_mark_authenticated(sm, bssid);
6fc6879b 497 ret = wpa_ft_install_ptk(sm, bssid);
86f7b62a
JM		 498 if (ret) {
499 /*
500 * Some drivers do not support key configuration when we are
501 * not associated with the target AP. Work around this by
502 * trying again after the following reassociation gets
503 * completed.
504 */
505 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
506 "association - try again after reassociation");
507 sm->set_ptk_after_assoc = 1;
508 } else
509 sm->set_ptk_after_assoc = 0;
6fc6879b 510
86f7b62a
JM		 511 sm->ft_completed = 1;
512 if (ft_action) {
513 /*
514 * The caller is expected trigger re-association with the
515 * Target AP.
516 */
517 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
6fc6879b
JM		 518 }
519
86f7b62a 520 return 0;
6fc6879b
JM		 521}
522
523
524int wpa_ft_is_completed(struct wpa_sm *sm)
525{
526 if (sm == NULL)
527 return 0;
528
529 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
530 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
531 return 0;
532
533 return sm->ft_completed;
534}
535
536
02db75b6
DG		 537void wpa_reset_ft_completed(struct wpa_sm *sm)
538{
539 if (sm != NULL)
540 sm->ft_completed = 0;
541}
542
543
b27f13ed
JM		 544static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
545 size_t gtk_elem_len)
546{
547 u8 gtk[32];
548 int keyidx;
71934751 549 enum wpa_alg alg;
b27f13ed
JM		 550 size_t gtk_len, keylen, rsc_len;
551
552 if (gtk_elem == NULL) {
553 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
554 return 0;
555 }
556
557 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
558 gtk_elem, gtk_elem_len);
559
39eb4d08
JM		 560 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
561 gtk_elem_len - 19 > sizeof(gtk)) {
b27f13ed
JM		 562 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
563 "length %lu", (unsigned long) gtk_elem_len);
564 return -1;
565 }
39eb4d08
JM		 566 gtk_len = gtk_elem_len - 19;
567 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
b27f13ed
JM		 568 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
569 "decrypt GTK");
570 return -1;
571 }
572
c3550295
JM		 573 keylen = wpa_cipher_key_len(sm->group_cipher);
574 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
575 alg = wpa_cipher_to_alg(sm->group_cipher);
576 if (alg == WPA_ALG_NONE) {
b27f13ed
JM		 577 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
578 sm->group_cipher);
579 return -1;
580 }
581
582 if (gtk_len < keylen) {
583 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
584 return -1;
585 }
586
39eb4d08 587 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
b27f13ed 588
39eb4d08 589 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
b27f13ed 590
39eb4d08 591 if (gtk_elem[2] != keylen) {
b27f13ed
JM		 592 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
593 "negotiated %lu",
39eb4d08 594 gtk_elem[2], (unsigned long) keylen);
b27f13ed
JM		 595 return -1;
596 }
597
598 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
b54c9ff9
JM		 599 if (sm->group_cipher == WPA_CIPHER_TKIP) {
600 /* Swap Tx/Rx keys for Michael MIC */
601 u8 tmp[8];
602 os_memcpy(tmp, gtk + 16, 8);
603 os_memcpy(gtk + 16, gtk + 24, 8);
604 os_memcpy(gtk + 24, tmp, 8);
605 }
0382097e
JM		 606 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
607 gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
b27f13ed
JM		 608 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
609 "driver.");
610 return -1;
611 }
612
613 return 0;
614}
615
616
617#ifdef CONFIG_IEEE80211W
618static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
619 size_t igtk_elem_len)
620{
621 u8 igtk[WPA_IGTK_LEN];
622 u16 keyidx;
623
624 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
625 return 0;
626
627 if (igtk_elem == NULL) {
628 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
629 return 0;
630 }
631
632 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
633 igtk_elem, igtk_elem_len);
634
ff89afb7 635 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
b27f13ed
JM		 636 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
637 "length %lu", (unsigned long) igtk_elem_len);
638 return -1;
639 }
ff89afb7
JM		 640 if (igtk_elem[8] != WPA_IGTK_LEN) {
641 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
642 "%d", igtk_elem[8]);
643 return -1;
644 }
645
646 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
b27f13ed
JM		 647 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
648 "decrypt IGTK");
649 return -1;
650 }
651
ff89afb7 652 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
b27f13ed
JM		 653
654 keyidx = WPA_GET_LE16(igtk_elem);
655
656 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
657 WPA_IGTK_LEN);
0382097e
JM		 658 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
659 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
b27f13ed
JM		 660 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
661 "driver.");
662 return -1;
663 }
664
665 return 0;
666}
667#endif /* CONFIG_IEEE80211W */
668
669
6fc6879b 670int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
658d1662 671 size_t ies_len, const u8 *src_addr)
6fc6879b
JM		 672{
673 struct wpa_ft_ies parse;
674 struct rsn_mdie *mdie;
675 struct rsn_ftie *ftie;
8aaf894d 676 unsigned int count;
6fc6879b 677 u8 mic[16];
6fc6879b
JM		 678
679 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
680
681 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
682 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
683 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
684 "enabled for this connection");
685 return -1;
686 }
687
688 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
689 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
690 return -1;
691 }
692
693 mdie = (struct rsn_mdie *) parse.mdie;
694 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
695 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
696 MOBILITY_DOMAIN_ID_LEN) != 0) {
697 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
698 return -1;
699 }
700
701 ftie = (struct rsn_ftie *) parse.ftie;
702 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
703 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
704 return -1;
705 }
706
148fb67d
JM		 707 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
708 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
709 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
710 ftie->snonce, WPA_NONCE_LEN);
711 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
712 sm->snonce, WPA_NONCE_LEN);
713 return -1;
714 }
715
716 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
717 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
718 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
719 ftie->anonce, WPA_NONCE_LEN);
720 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
721 sm->anonce, WPA_NONCE_LEN);
722 return -1;
723 }
724
6fc6879b
JM		 725 if (parse.r0kh_id == NULL) {
726 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
727 return -1;
728 }
729
730 if (parse.r0kh_id_len != sm->r0kh_id_len ||
731 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
732 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
733 "the current R0KH-ID");
734 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
735 parse.r0kh_id, parse.r0kh_id_len);
736 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
737 sm->r0kh_id, sm->r0kh_id_len);
738 return -1;
739 }
740
741 if (parse.r1kh_id == NULL) {
742 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
743 return -1;
744 }
745
746 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
747 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
748 "ReassocResp");
749 return -1;
750 }
751
752 if (parse.rsn_pmkid == NULL ||
753 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
754 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
755 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
756 return -1;
757 }
758
759 count = 3;
c284b461
HW		 760 if (parse.ric)
761 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
8aaf894d
JM		 762 if (ftie->mic_control[1] != count) {
763 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
764 "Control: received %u expected %u",
765 ftie->mic_control[1], count);
766 return -1;
767 }
6fc6879b 768
658d1662 769 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
6fc6879b
JM		 770 parse.mdie - 2, parse.mdie_len + 2,
771 parse.ftie - 2, parse.ftie_len + 2,
f238cf9f
JM		 772 parse.rsn - 2, parse.rsn_len + 2,
773 parse.ric, parse.ric_len,
6fc6879b
JM		 774 mic) < 0) {
775 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
776 return -1;
777 }
778
779 if (os_memcmp(mic, ftie->mic, 16) != 0) {
780 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
781 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
782 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
783 return -1;
784 }
785
b27f13ed 786 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
6fc6879b 787 return -1;
6fc6879b 788
b27f13ed
JM		 789#ifdef CONFIG_IEEE80211W
790 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
6fc6879b 791 return -1;
b27f13ed 792#endif /* CONFIG_IEEE80211W */
6fc6879b 793
86f7b62a
JM		 794 if (sm->set_ptk_after_assoc) {
795 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
796 "are associated");
797 if (wpa_ft_install_ptk(sm, src_addr) < 0)
798 return -1;
799 sm->set_ptk_after_assoc = 0;
800 }
801
f238cf9f
JM		 802 if (parse.ric) {
803 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
804 parse.ric, parse.ric_len);
6a1ce395
DG		 805 /* TODO: parse response and inform driver about results when
806 * using wpa_supplicant SME */
f238cf9f
JM		 807 }
808
6a1ce395
DG		 809 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
810
6fc6879b
JM		 811 return 0;
812}
813
814
815/**
816 * wpa_ft_start_over_ds - Generate over-the-DS auth request
817 * @sm: Pointer to WPA state machine data from wpa_sm_init()
76b7981d
JM		 818 * @target_ap: Target AP Address
819 * @mdie: Mobility Domain IE from the target AP
6fc6879b
JM		 820 * Returns: 0 on success, -1 on failure
821 */
76b7981d
JM		 822int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
823 const u8 *mdie)
6fc6879b
JM		 824{
825 u8 *ft_ies;
826 size_t ft_ies_len;
827
828 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
829 MAC2STR(target_ap));
830
831 /* Generate a new SNonce */
3642c431 832 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
6fc6879b
JM		 833 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
834 return -1;
835 }
836
837 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
76b7981d 838 NULL, target_ap, NULL, 0, mdie);
6fc6879b
JM		 839 if (ft_ies) {
840 sm->over_the_ds_in_progress = 1;
841 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
842 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
843 os_free(ft_ies);
844 }
845
846 return 0;
847}
848
849#endif /* CONFIG_IEEE80211R */
Unnamed repository; edit this file 'description' to name the repository.