Line data Source code
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 :
21 16 : 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 16 : const u8 *anonce = key->key_nonce;
27 :
28 16 : if (sm->xxkey_len == 0) {
29 0 : wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
30 : "derivation");
31 0 : return -1;
32 : }
33 :
34 32 : wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
35 16 : sm->ssid_len, sm->mobility_domain,
36 32 : sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
37 16 : sm->pmk_r0, sm->pmk_r0_name);
38 16 : wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
39 16 : wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
40 16 : sm->pmk_r0_name, WPA_PMK_NAME_LEN);
41 16 : wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
42 16 : sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
43 16 : wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
44 16 : wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
45 : WPA_PMK_NAME_LEN);
46 16 : wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
47 16 : sm->bssid, sm->pmk_r1_name,
48 : (u8 *) ptk, ptk_len, ptk_name);
49 16 : wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
50 16 : wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
51 :
52 16 : 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 : */
63 2102 : 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 2102 : if (sm == NULL)
68 0 : return 0;
69 :
70 2102 : if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0)
71 0 : return -1;
72 :
73 2102 : if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
74 0 : return -1;
75 :
76 2102 : if (ft.mdie) {
77 66 : wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
78 66 : ft.mdie, MOBILITY_DOMAIN_ID_LEN);
79 66 : os_memcpy(sm->mobility_domain, ft.mdie,
80 : MOBILITY_DOMAIN_ID_LEN);
81 66 : sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
82 66 : wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
83 66 : sm->mdie_ft_capab);
84 : } else
85 2036 : os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
86 :
87 2102 : if (ft.r0kh_id) {
88 72 : wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
89 36 : ft.r0kh_id, ft.r0kh_id_len);
90 36 : os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
91 36 : 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 2102 : if (ft.r1kh_id) {
102 36 : wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
103 36 : ft.r1kh_id, FT_R1KH_ID_LEN);
104 36 : os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
105 : } else
106 2066 : os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
107 :
108 2102 : os_free(sm->assoc_resp_ies);
109 2102 : sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
110 2102 : if (sm->assoc_resp_ies) {
111 2102 : u8 *pos = sm->assoc_resp_ies;
112 2102 : if (ft.mdie) {
113 66 : os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
114 66 : pos += ft.mdie_len + 2;
115 : }
116 2102 : if (ft.ftie) {
117 36 : os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
118 36 : pos += ft.ftie_len + 2;
119 : }
120 2102 : sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
121 4204 : wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
122 : "(Re)Association Response",
123 2102 : sm->assoc_resp_ies, sm->assoc_resp_ies_len);
124 : }
125 :
126 2102 : 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 : */
145 119 : 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 :
158 119 : sm->ft_completed = 0;
159 :
160 119 : buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
161 119 : 2 + sm->r0kh_id_len + ric_ies_len + 100;
162 119 : buf = os_zalloc(buf_len);
163 119 : if (buf == NULL)
164 0 : return NULL;
165 119 : pos = buf;
166 :
167 : /* RSNIE[PMKR0Name/PMKR1Name] */
168 119 : rsnie = (struct rsn_ie_hdr *) pos;
169 119 : rsnie->elem_id = WLAN_EID_RSN;
170 119 : WPA_PUT_LE16(rsnie->version, RSN_VERSION);
171 119 : pos = (u8 *) (rsnie + 1);
172 :
173 : /* Group Suite Selector */
174 129 : if (sm->group_cipher != WPA_CIPHER_CCMP &&
175 20 : sm->group_cipher != WPA_CIPHER_GCMP &&
176 10 : sm->group_cipher != WPA_CIPHER_TKIP) {
177 0 : wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
178 : sm->group_cipher);
179 0 : os_free(buf);
180 0 : return NULL;
181 : }
182 119 : RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
183 : sm->group_cipher));
184 119 : pos += RSN_SELECTOR_LEN;
185 :
186 : /* Pairwise Suite Count */
187 119 : WPA_PUT_LE16(pos, 1);
188 119 : pos += 2;
189 :
190 : /* Pairwise Suite List */
191 119 : if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
192 0 : wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
193 : sm->pairwise_cipher);
194 0 : os_free(buf);
195 0 : return NULL;
196 : }
197 119 : RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
198 : sm->pairwise_cipher));
199 119 : pos += RSN_SELECTOR_LEN;
200 :
201 : /* Authenticated Key Management Suite Count */
202 119 : WPA_PUT_LE16(pos, 1);
203 119 : pos += 2;
204 :
205 : /* Authenticated Key Management Suite List */
206 119 : if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
207 22 : RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
208 97 : else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
209 75 : RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
210 22 : else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
211 22 : RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
212 : else {
213 0 : wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
214 : sm->key_mgmt);
215 0 : os_free(buf);
216 0 : return NULL;
217 : }
218 119 : pos += RSN_SELECTOR_LEN;
219 :
220 : /* RSN Capabilities */
221 119 : capab = 0;
222 : #ifdef CONFIG_IEEE80211W
223 119 : if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
224 26 : capab |= WPA_CAPABILITY_MFPC;
225 : #endif /* CONFIG_IEEE80211W */
226 119 : WPA_PUT_LE16(pos, capab);
227 119 : pos += 2;
228 :
229 : /* PMKID Count */
230 119 : WPA_PUT_LE16(pos, 1);
231 119 : pos += 2;
232 :
233 : /* PMKID List [PMKR0Name/PMKR1Name] */
234 119 : os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
235 119 : pos += WPA_PMK_NAME_LEN;
236 :
237 : #ifdef CONFIG_IEEE80211W
238 119 : if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
239 : /* Management Group Cipher Suite */
240 26 : RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
241 26 : pos += RSN_SELECTOR_LEN;
242 : }
243 : #endif /* CONFIG_IEEE80211W */
244 :
245 119 : rsnie->len = (pos - (u8 *) rsnie) - 2;
246 :
247 : /* MDIE */
248 119 : *pos++ = WLAN_EID_MOBILITY_DOMAIN;
249 119 : *pos++ = sizeof(*mdie);
250 119 : mdie = (struct rsn_mdie *) pos;
251 119 : pos += sizeof(*mdie);
252 119 : os_memcpy(mdie->mobility_domain, sm->mobility_domain,
253 : MOBILITY_DOMAIN_ID_LEN);
254 119 : 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 ] */
258 119 : ftie_pos = pos;
259 119 : *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
260 119 : ftie_len = pos++;
261 119 : ftie = (struct rsn_ftie *) pos;
262 119 : pos += sizeof(*ftie);
263 119 : os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
264 119 : if (anonce)
265 20 : os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
266 119 : if (kck) {
267 : /* R1KH-ID sub-element in third FT message */
268 20 : *pos++ = FTIE_SUBELEM_R1KH_ID;
269 20 : *pos++ = FT_R1KH_ID_LEN;
270 20 : os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
271 20 : pos += FT_R1KH_ID_LEN;
272 : }
273 : /* R0KH-ID sub-element */
274 119 : *pos++ = FTIE_SUBELEM_R0KH_ID;
275 119 : *pos++ = sm->r0kh_id_len;
276 119 : os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
277 119 : pos += sm->r0kh_id_len;
278 119 : *ftie_len = pos - ftie_len - 1;
279 :
280 119 : if (ric_ies) {
281 : /* RIC Request */
282 0 : os_memcpy(pos, ric_ies, ric_ies_len);
283 0 : pos += ric_ies_len;
284 : }
285 :
286 119 : 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 20 : ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
300 : ric_ies_len);
301 40 : if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
302 : ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
303 20 : ftie_pos, 2 + *ftie_len,
304 20 : (u8 *) rsnie, 2 + rsnie->len, ric_ies,
305 20 : ric_ies_len, ftie->mic) < 0) {
306 0 : wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
307 0 : os_free(buf);
308 0 : return NULL;
309 : }
310 : }
311 :
312 119 : *len = pos - buf;
313 :
314 119 : return buf;
315 : }
316 :
317 :
318 40 : static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
319 : {
320 : int keylen;
321 : enum wpa_alg alg;
322 40 : u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
323 :
324 40 : wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
325 :
326 40 : if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
327 0 : wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
328 : sm->pairwise_cipher);
329 0 : return -1;
330 : }
331 :
332 40 : alg = wpa_cipher_to_alg(sm->pairwise_cipher);
333 40 : keylen = wpa_cipher_key_len(sm->pairwise_cipher);
334 :
335 80 : if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
336 40 : sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
337 20 : wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
338 20 : return -1;
339 : }
340 :
341 20 : return 0;
342 : }
343 :
344 :
345 : /**
346 : * wpa_ft_prepare_auth_request - Generate over-the-air auth request
347 : * @sm: Pointer to WPA state machine data from wpa_sm_init()
348 : * @mdie: Target AP MDIE
349 : * Returns: 0 on success, -1 on failure
350 : */
351 86 : int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
352 : {
353 : u8 *ft_ies;
354 : size_t ft_ies_len;
355 :
356 : /* Generate a new SNonce */
357 86 : if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
358 0 : wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
359 0 : return -1;
360 : }
361 :
362 86 : ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
363 86 : NULL, sm->bssid, NULL, 0, mdie);
364 86 : if (ft_ies) {
365 86 : wpa_sm_update_ft_ies(sm, sm->mobility_domain,
366 : ft_ies, ft_ies_len);
367 86 : os_free(ft_ies);
368 : }
369 :
370 86 : return 0;
371 : }
372 :
373 :
374 20 : int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
375 : int ft_action, const u8 *target_ap,
376 : const u8 *ric_ies, size_t ric_ies_len)
377 : {
378 : u8 *ft_ies;
379 : size_t ft_ies_len, ptk_len;
380 : struct wpa_ft_ies parse;
381 : struct rsn_mdie *mdie;
382 : struct rsn_ftie *ftie;
383 : u8 ptk_name[WPA_PMK_NAME_LEN];
384 : int ret;
385 : const u8 *bssid;
386 :
387 20 : wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
388 20 : wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
389 :
390 20 : if (ft_action) {
391 8 : if (!sm->over_the_ds_in_progress) {
392 0 : wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
393 : "- drop FT Action Response");
394 0 : return -1;
395 : }
396 :
397 8 : if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
398 0 : wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
399 : "with this Target AP - drop FT Action "
400 : "Response");
401 0 : return -1;
402 : }
403 : }
404 :
405 20 : if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
406 0 : wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
407 : "enabled for this connection");
408 0 : return -1;
409 : }
410 :
411 20 : if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
412 0 : wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
413 0 : return -1;
414 : }
415 :
416 20 : mdie = (struct rsn_mdie *) parse.mdie;
417 40 : if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
418 20 : os_memcmp(mdie->mobility_domain, sm->mobility_domain,
419 : MOBILITY_DOMAIN_ID_LEN) != 0) {
420 0 : wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
421 0 : return -1;
422 : }
423 :
424 20 : ftie = (struct rsn_ftie *) parse.ftie;
425 20 : if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
426 0 : wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
427 0 : return -1;
428 : }
429 :
430 20 : if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
431 0 : wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
432 0 : wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
433 0 : ftie->snonce, WPA_NONCE_LEN);
434 0 : wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
435 0 : sm->snonce, WPA_NONCE_LEN);
436 0 : return -1;
437 : }
438 :
439 20 : if (parse.r0kh_id == NULL) {
440 0 : wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
441 0 : return -1;
442 : }
443 :
444 40 : if (parse.r0kh_id_len != sm->r0kh_id_len ||
445 20 : os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
446 0 : wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
447 : "the current R0KH-ID");
448 0 : wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
449 0 : parse.r0kh_id, parse.r0kh_id_len);
450 0 : wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
451 0 : sm->r0kh_id, sm->r0kh_id_len);
452 0 : return -1;
453 : }
454 :
455 20 : if (parse.r1kh_id == NULL) {
456 0 : wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
457 0 : return -1;
458 : }
459 :
460 40 : if (parse.rsn_pmkid == NULL ||
461 20 : os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
462 0 : wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
463 : "RSNIE");
464 0 : return -1;
465 : }
466 :
467 20 : os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
468 20 : wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
469 20 : wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
470 20 : wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
471 20 : os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
472 20 : wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
473 20 : sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
474 20 : wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
475 20 : wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
476 20 : sm->pmk_r1_name, WPA_PMK_NAME_LEN);
477 :
478 20 : bssid = target_ap;
479 20 : ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
480 20 : wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
481 20 : bssid, sm->pmk_r1_name,
482 20 : (u8 *) &sm->ptk, ptk_len, ptk_name);
483 20 : wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
484 20 : (u8 *) &sm->ptk, ptk_len);
485 20 : wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
486 :
487 60 : ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
488 20 : sm->pmk_r1_name, sm->ptk.kck, bssid,
489 : ric_ies, ric_ies_len,
490 40 : parse.mdie ? parse.mdie - 2 : NULL);
491 20 : if (ft_ies) {
492 20 : wpa_sm_update_ft_ies(sm, sm->mobility_domain,
493 : ft_ies, ft_ies_len);
494 20 : os_free(ft_ies);
495 : }
496 :
497 20 : wpa_sm_mark_authenticated(sm, bssid);
498 20 : ret = wpa_ft_install_ptk(sm, bssid);
499 20 : if (ret) {
500 : /*
501 : * Some drivers do not support key configuration when we are
502 : * not associated with the target AP. Work around this by
503 : * trying again after the following reassociation gets
504 : * completed.
505 : */
506 20 : wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
507 : "association - try again after reassociation");
508 20 : sm->set_ptk_after_assoc = 1;
509 : } else
510 0 : sm->set_ptk_after_assoc = 0;
511 :
512 20 : sm->ft_completed = 1;
513 20 : if (ft_action) {
514 : /*
515 : * The caller is expected trigger re-association with the
516 : * Target AP.
517 : */
518 8 : os_memcpy(sm->bssid, target_ap, ETH_ALEN);
519 : }
520 :
521 20 : return 0;
522 : }
523 :
524 :
525 2127 : int wpa_ft_is_completed(struct wpa_sm *sm)
526 : {
527 2127 : if (sm == NULL)
528 0 : return 0;
529 :
530 2127 : if (!wpa_key_mgmt_ft(sm->key_mgmt))
531 2055 : return 0;
532 :
533 72 : return sm->ft_completed;
534 : }
535 :
536 :
537 1114 : void wpa_reset_ft_completed(struct wpa_sm *sm)
538 : {
539 1114 : if (sm != NULL)
540 1114 : sm->ft_completed = 0;
541 1114 : }
542 :
543 :
544 20 : static 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;
549 : enum wpa_alg alg;
550 : size_t gtk_len, keylen, rsc_len;
551 :
552 20 : if (gtk_elem == NULL) {
553 0 : wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
554 0 : return 0;
555 : }
556 :
557 20 : wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
558 : gtk_elem, gtk_elem_len);
559 :
560 40 : if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
561 20 : gtk_elem_len - 19 > sizeof(gtk)) {
562 0 : wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
563 : "length %lu", (unsigned long) gtk_elem_len);
564 0 : return -1;
565 : }
566 20 : gtk_len = gtk_elem_len - 19;
567 20 : if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
568 0 : wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
569 : "decrypt GTK");
570 0 : return -1;
571 : }
572 :
573 20 : keylen = wpa_cipher_key_len(sm->group_cipher);
574 20 : rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
575 20 : alg = wpa_cipher_to_alg(sm->group_cipher);
576 20 : if (alg == WPA_ALG_NONE) {
577 0 : wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
578 : sm->group_cipher);
579 0 : return -1;
580 : }
581 :
582 20 : if (gtk_len < keylen) {
583 0 : wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
584 0 : return -1;
585 : }
586 :
587 : /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
588 :
589 20 : keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
590 :
591 20 : if (gtk_elem[2] != keylen) {
592 0 : wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
593 : "negotiated %lu",
594 0 : gtk_elem[2], (unsigned long) keylen);
595 0 : return -1;
596 : }
597 :
598 20 : wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
599 20 : if (sm->group_cipher == WPA_CIPHER_TKIP) {
600 : /* Swap Tx/Rx keys for Michael MIC */
601 : u8 tmp[8];
602 2 : os_memcpy(tmp, gtk + 16, 8);
603 2 : os_memcpy(gtk + 16, gtk + 24, 8);
604 2 : os_memcpy(gtk + 24, tmp, 8);
605 : }
606 20 : if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
607 : gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
608 0 : wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
609 : "driver.");
610 0 : return -1;
611 : }
612 :
613 20 : return 0;
614 : }
615 :
616 :
617 : #ifdef CONFIG_IEEE80211W
618 20 : static 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 20 : if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
625 16 : return 0;
626 :
627 4 : if (igtk_elem == NULL) {
628 0 : wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
629 0 : return 0;
630 : }
631 :
632 4 : wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
633 : igtk_elem, igtk_elem_len);
634 :
635 4 : if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
636 0 : wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
637 : "length %lu", (unsigned long) igtk_elem_len);
638 0 : return -1;
639 : }
640 4 : if (igtk_elem[8] != WPA_IGTK_LEN) {
641 0 : wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
642 0 : "%d", igtk_elem[8]);
643 0 : return -1;
644 : }
645 :
646 4 : if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
647 0 : wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
648 : "decrypt IGTK");
649 0 : return -1;
650 : }
651 :
652 : /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
653 :
654 4 : keyidx = WPA_GET_LE16(igtk_elem);
655 :
656 4 : wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
657 : WPA_IGTK_LEN);
658 4 : if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
659 : igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
660 0 : wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
661 : "driver.");
662 0 : return -1;
663 : }
664 :
665 4 : return 0;
666 : }
667 : #endif /* CONFIG_IEEE80211W */
668 :
669 :
670 20 : int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
671 : size_t ies_len, const u8 *src_addr)
672 : {
673 : struct wpa_ft_ies parse;
674 : struct rsn_mdie *mdie;
675 : struct rsn_ftie *ftie;
676 : unsigned int count;
677 : u8 mic[16];
678 :
679 20 : wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
680 :
681 20 : if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
682 0 : wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
683 : "enabled for this connection");
684 0 : return -1;
685 : }
686 :
687 20 : if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
688 0 : wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
689 0 : return -1;
690 : }
691 :
692 20 : mdie = (struct rsn_mdie *) parse.mdie;
693 40 : if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
694 20 : os_memcmp(mdie->mobility_domain, sm->mobility_domain,
695 : MOBILITY_DOMAIN_ID_LEN) != 0) {
696 0 : wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
697 0 : return -1;
698 : }
699 :
700 20 : ftie = (struct rsn_ftie *) parse.ftie;
701 20 : if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
702 0 : wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
703 0 : return -1;
704 : }
705 :
706 20 : if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
707 0 : wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
708 0 : wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
709 0 : ftie->snonce, WPA_NONCE_LEN);
710 0 : wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
711 0 : sm->snonce, WPA_NONCE_LEN);
712 0 : return -1;
713 : }
714 :
715 20 : if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
716 0 : wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
717 0 : wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
718 0 : ftie->anonce, WPA_NONCE_LEN);
719 0 : wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
720 0 : sm->anonce, WPA_NONCE_LEN);
721 0 : return -1;
722 : }
723 :
724 20 : if (parse.r0kh_id == NULL) {
725 0 : wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
726 0 : return -1;
727 : }
728 :
729 40 : if (parse.r0kh_id_len != sm->r0kh_id_len ||
730 20 : os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
731 0 : wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
732 : "the current R0KH-ID");
733 0 : wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
734 0 : parse.r0kh_id, parse.r0kh_id_len);
735 0 : wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
736 0 : sm->r0kh_id, sm->r0kh_id_len);
737 0 : return -1;
738 : }
739 :
740 20 : if (parse.r1kh_id == NULL) {
741 0 : wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
742 0 : return -1;
743 : }
744 :
745 20 : if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
746 0 : wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
747 : "ReassocResp");
748 0 : return -1;
749 : }
750 :
751 40 : if (parse.rsn_pmkid == NULL ||
752 20 : os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
753 0 : wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
754 0 : "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
755 0 : return -1;
756 : }
757 :
758 20 : count = 3;
759 20 : if (parse.ric)
760 0 : count += ieee802_11_ie_count(parse.ric, parse.ric_len);
761 20 : if (ftie->mic_control[1] != count) {
762 0 : wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
763 : "Control: received %u expected %u",
764 0 : ftie->mic_control[1], count);
765 0 : return -1;
766 : }
767 :
768 140 : if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
769 40 : parse.mdie - 2, parse.mdie_len + 2,
770 40 : parse.ftie - 2, parse.ftie_len + 2,
771 40 : parse.rsn - 2, parse.rsn_len + 2,
772 : parse.ric, parse.ric_len,
773 : mic) < 0) {
774 0 : wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
775 0 : return -1;
776 : }
777 :
778 20 : if (os_memcmp(mic, ftie->mic, 16) != 0) {
779 0 : wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
780 0 : wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
781 0 : wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
782 0 : return -1;
783 : }
784 :
785 20 : if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
786 0 : return -1;
787 :
788 : #ifdef CONFIG_IEEE80211W
789 20 : if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
790 0 : return -1;
791 : #endif /* CONFIG_IEEE80211W */
792 :
793 20 : if (sm->set_ptk_after_assoc) {
794 20 : wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
795 : "are associated");
796 20 : if (wpa_ft_install_ptk(sm, src_addr) < 0)
797 0 : return -1;
798 20 : sm->set_ptk_after_assoc = 0;
799 : }
800 :
801 20 : if (parse.ric) {
802 0 : wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
803 0 : parse.ric, parse.ric_len);
804 : /* TODO: parse response and inform driver about results when
805 : * using wpa_supplicant SME */
806 : }
807 :
808 20 : wpa_printf(MSG_DEBUG, "FT: Completed successfully");
809 :
810 20 : return 0;
811 : }
812 :
813 :
814 : /**
815 : * wpa_ft_start_over_ds - Generate over-the-DS auth request
816 : * @sm: Pointer to WPA state machine data from wpa_sm_init()
817 : * @target_ap: Target AP Address
818 : * @mdie: Mobility Domain IE from the target AP
819 : * Returns: 0 on success, -1 on failure
820 : */
821 13 : int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
822 : const u8 *mdie)
823 : {
824 : u8 *ft_ies;
825 : size_t ft_ies_len;
826 :
827 78 : wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
828 78 : MAC2STR(target_ap));
829 :
830 : /* Generate a new SNonce */
831 13 : if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
832 0 : wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
833 0 : return -1;
834 : }
835 :
836 13 : ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
837 : NULL, target_ap, NULL, 0, mdie);
838 13 : if (ft_ies) {
839 13 : sm->over_the_ds_in_progress = 1;
840 13 : os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
841 13 : wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
842 13 : os_free(ft_ies);
843 : }
844 :
845 13 : return 0;
846 : }
847 :
848 : #endif /* CONFIG_IEEE80211R */
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