1 /*
2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "wpa.h"
19 #include "wpa_i.h"
20 #include "wpa_ie.h"
21 #include "aes_wrap.h"
22 #include "ieee802_11_defs.h"
23
24 #ifdef CONFIG_IEEE80211R
25
wpa_derive_ptk_ft(struct wpa_sm * sm,const unsigned char * src_addr,const struct wpa_eapol_key * key,struct wpa_ptk * ptk,size_t ptk_len)26 int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
27 const struct wpa_eapol_key *key,
28 struct wpa_ptk *ptk, size_t ptk_len)
29 {
30 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
31 u8 ptk_name[WPA_PMK_NAME_LEN];
32 const u8 *anonce = key->key_nonce;
33
34 if (sm->xxkey_len == 0) {
35 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
36 "derivation");
37 return -1;
38 }
39
40 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
41 sm->ssid_len, sm->mobility_domain,
42 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
43 sm->pmk_r0, sm->pmk_r0_name);
44 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
45 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
46 sm->pmk_r0_name, WPA_PMK_NAME_LEN);
47 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
48 sm->own_addr, sm->pmk_r1, pmk_r1_name);
49 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
50 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
51 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
52 sm->bssid, pmk_r1_name,
53 (u8 *) ptk, ptk_len, ptk_name);
54 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
55 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
56
57 return 0;
58 }
59
60
61 /**
62 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
63 * @sm: Pointer to WPA state machine data from wpa_sm_init()
64 * @mobility_domain: Mobility domain identifier (2 octets)
65 * @r0kh_id: PMK-R0 key holder identity (1-48 octets)
66 * @r0kh_id_len: R0KH-ID length (1-48)
67 * @r1kh_id: PMK-R1 key holder identity (16 octets)
68 * Returns: 0 on success, -1 on failure
69 */
wpa_sm_set_ft_params(struct wpa_sm * sm,const u8 * mobility_domain,const u8 * r0kh_id,size_t r0kh_id_len,const u8 * r1kh_id)70 int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *mobility_domain,
71 const u8 *r0kh_id, size_t r0kh_id_len,
72 const u8 *r1kh_id)
73 {
74 if (sm && mobility_domain) {
75 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
76 mobility_domain, MOBILITY_DOMAIN_ID_LEN);
77 os_memcpy(sm->mobility_domain, mobility_domain,
78 MOBILITY_DOMAIN_ID_LEN);
79 } else if (sm)
80 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
81
82 if (sm && r0kh_id) {
83 if (r0kh_id_len > FT_R0KH_ID_MAX_LEN)
84 return -1;
85 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", r0kh_id, r0kh_id_len);
86 os_memcpy(sm->r0kh_id, r0kh_id, r0kh_id_len);
87 sm->r0kh_id_len = r0kh_id_len;
88 } else if (sm) {
89 /* FIX: When should R0KH-ID be cleared? We need to keep the
90 * old R0KH-ID in order to be able to use this during FT. */
91 /*
92 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
93 * sm->r0kh_id_len = 0;
94 */
95 }
96
97 if (sm && r1kh_id) {
98 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", r1kh_id, FT_R1KH_ID_LEN);
99 os_memcpy(sm->r1kh_id, r1kh_id, FT_R1KH_ID_LEN);
100 } else if (sm)
101 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
102
103 return 0;
104 }
105
106
107 /**
108 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth Request
109 * @sm: Pointer to WPA state machine data from wpa_sm_init()
110 * @len: Buffer for returning the length of the IEs
111 * @anonce: ANonce or %NULL if not yet available
112 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
113 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
114 * @target_ap: Target AP address
115 * Returns: Pointer to buffer with IEs or %NULL on failure
116 *
117 * Caller is responsible for freeing the returned buffer with os_free();
118 */
wpa_ft_gen_req_ies(struct wpa_sm * sm,size_t * len,const u8 * anonce,const u8 * pmk_name,const u8 * kck,const u8 * target_ap)119 static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
120 const u8 *anonce, const u8 *pmk_name,
121 const u8 *kck, const u8 *target_ap)
122 {
123 size_t buf_len;
124 u8 *buf, *pos, *ftie_len, *ftie_pos;
125 struct rsn_mdie *mdie;
126 struct rsn_ftie *ftie;
127 struct rsn_ie_hdr *rsnie;
128 u16 capab;
129
130 sm->ft_completed = 0;
131
132 buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
133 2 + sm->r0kh_id_len + 100;
134 buf = os_zalloc(buf_len);
135 if (buf == NULL)
136 return NULL;
137 pos = buf;
138
139 /* RSNIE[PMKR0Name] */
140 rsnie = (struct rsn_ie_hdr *) pos;
141 rsnie->elem_id = WLAN_EID_RSN;
142 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
143 pos = (u8 *) (rsnie + 1);
144
145 /* Group Suite Selector */
146 if (sm->group_cipher == WPA_CIPHER_CCMP)
147 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
148 else if (sm->group_cipher == WPA_CIPHER_TKIP)
149 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
150 else {
151 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
152 sm->group_cipher);
153 os_free(buf);
154 return NULL;
155 }
156 pos += RSN_SELECTOR_LEN;
157
158 /* Pairwise Suite Count */
159 WPA_PUT_LE16(pos, 1);
160 pos += 2;
161
162 /* Pairwise Suite List */
163 if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
164 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
165 else if (sm->pairwise_cipher == WPA_CIPHER_TKIP)
166 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
167 else {
168 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
169 sm->pairwise_cipher);
170 os_free(buf);
171 return NULL;
172 }
173 pos += RSN_SELECTOR_LEN;
174
175 /* Authenticated Key Management Suite Count */
176 WPA_PUT_LE16(pos, 1);
177 pos += 2;
178
179 /* Authenticated Key Management Suite List */
180 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
181 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
182 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
183 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
184 else {
185 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
186 sm->key_mgmt);
187 os_free(buf);
188 return NULL;
189 }
190 pos += RSN_SELECTOR_LEN;
191
192 /* RSN Capabilities */
193 capab = 0;
194 #ifdef CONFIG_IEEE80211W
195 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
196 capab |= WPA_CAPABILITY_MFPC;
197 #endif /* CONFIG_IEEE80211W */
198 WPA_PUT_LE16(pos, capab);
199 pos += 2;
200
201 /* PMKID Count */
202 WPA_PUT_LE16(pos, 1);
203 pos += 2;
204
205 /* PMKID List [PMKR0Name/PMKR1Name] */
206 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
207 pos += WPA_PMK_NAME_LEN;
208
209 #ifdef CONFIG_IEEE80211W
210 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
211 /* Management Group Cipher Suite */
212 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
213 pos += RSN_SELECTOR_LEN;
214 }
215 #endif /* CONFIG_IEEE80211W */
216
217 rsnie->len = (pos - (u8 *) rsnie) - 2;
218
219 /* MDIE */
220 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
221 *pos++ = sizeof(*mdie);
222 mdie = (struct rsn_mdie *) pos;
223 pos += sizeof(*mdie);
224 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
225 MOBILITY_DOMAIN_ID_LEN);
226 mdie->ft_capab = 0; /* FIX: copy from the target AP's MDIE */
227
228 /* FTIE[SNonce, R0KH-ID] */
229 ftie_pos = pos;
230 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
231 ftie_len = pos++;
232 ftie = (struct rsn_ftie *) pos;
233 pos += sizeof(*ftie);
234 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
235 if (anonce)
236 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
237 /* R0KH-ID sub-element */
238 *pos++ = FTIE_SUBELEM_R0KH_ID;
239 *pos++ = sm->r0kh_id_len;
240 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
241 pos += sm->r0kh_id_len;
242 *ftie_len = pos - ftie_len - 1;
243
244 if (kck) {
245 /*
246 * IEEE Std 802.11r-2008, 11A.8.4
247 * MIC shall be calculated over:
248 * non-AP STA MAC address
249 * Target AP MAC address
250 * Transaction seq number (5 for ReassocReq, 3 otherwise)
251 * RSN IE
252 * MDIE
253 * FTIE (with MIC field set to 0)
254 * RIC-Request (if present)
255 */
256 ftie->mic_control[1] = 3; /* Information element count */
257 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
258 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
259 ftie_pos, 2 + *ftie_len,
260 (u8 *) rsnie, 2 + rsnie->len, NULL, 0,
261 ftie->mic) < 0) {
262 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
263 os_free(buf);
264 return NULL;
265 }
266 }
267
268 *len = pos - buf;
269
270 return buf;
271 }
272
273
274 struct wpa_ft_ies {
275 const u8 *mdie;
276 size_t mdie_len;
277 const u8 *ftie;
278 size_t ftie_len;
279 const u8 *r1kh_id;
280 const u8 *gtk;
281 size_t gtk_len;
282 const u8 *r0kh_id;
283 size_t r0kh_id_len;
284 const u8 *rsn;
285 size_t rsn_len;
286 const u8 *rsn_pmkid;
287 const u8 *tie;
288 size_t tie_len;
289 const u8 *igtk;
290 size_t igtk_len;
291 };
292
293
wpa_ft_parse_ftie(const u8 * ie,size_t ie_len,struct wpa_ft_ies * parse)294 static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
295 struct wpa_ft_ies *parse)
296 {
297 const u8 *end, *pos;
298
299 parse->ftie = ie;
300 parse->ftie_len = ie_len;
301
302 pos = ie + sizeof(struct rsn_ftie);
303 end = ie + ie_len;
304
305 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
306 switch (pos[0]) {
307 case FTIE_SUBELEM_R1KH_ID:
308 if (pos[1] != FT_R1KH_ID_LEN) {
309 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
310 "length in FTIE: %d", pos[1]);
311 return -1;
312 }
313 parse->r1kh_id = pos + 2;
314 break;
315 case FTIE_SUBELEM_GTK:
316 parse->gtk = pos + 2;
317 parse->gtk_len = pos[1];
318 break;
319 case FTIE_SUBELEM_R0KH_ID:
320 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
321 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
322 "length in FTIE: %d", pos[1]);
323 return -1;
324 }
325 parse->r0kh_id = pos + 2;
326 parse->r0kh_id_len = pos[1];
327 break;
328 #ifdef CONFIG_IEEE80211W
329 case FTIE_SUBELEM_IGTK:
330 parse->igtk = pos + 2;
331 parse->igtk_len = pos[1];
332 break;
333 #endif /* CONFIG_IEEE80211W */
334 }
335
336 pos += 2 + pos[1];
337 }
338
339 return 0;
340 }
341
342
wpa_ft_parse_ies(const u8 * ies,size_t ies_len,struct wpa_ft_ies * parse)343 static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
344 struct wpa_ft_ies *parse)
345 {
346 const u8 *end, *pos;
347 struct wpa_ie_data data;
348 int ret;
349
350 os_memset(parse, 0, sizeof(*parse));
351 if (ies == NULL)
352 return 0;
353
354 pos = ies;
355 end = ies + ies_len;
356 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
357 switch (pos[0]) {
358 case WLAN_EID_RSN:
359 parse->rsn = pos + 2;
360 parse->rsn_len = pos[1];
361 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
362 parse->rsn_len + 2,
363 &data);
364 if (ret < 0) {
365 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
366 "RSN IE: %d", ret);
367 return -1;
368 }
369 if (data.num_pmkid == 1 && data.pmkid)
370 parse->rsn_pmkid = data.pmkid;
371 break;
372 case WLAN_EID_MOBILITY_DOMAIN:
373 parse->mdie = pos + 2;
374 parse->mdie_len = pos[1];
375 break;
376 case WLAN_EID_FAST_BSS_TRANSITION:
377 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
378 return -1;
379 break;
380 case WLAN_EID_TIMEOUT_INTERVAL:
381 parse->tie = pos + 2;
382 parse->tie_len = pos[1];
383 break;
384 }
385
386 pos += 2 + pos[1];
387 }
388
389 return 0;
390 }
391
392
wpa_ft_install_ptk(struct wpa_sm * sm,const u8 * bssid)393 static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
394 {
395 int keylen;
396 wpa_alg alg;
397 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
398
399 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
400
401 switch (sm->pairwise_cipher) {
402 case WPA_CIPHER_CCMP:
403 alg = WPA_ALG_CCMP;
404 keylen = 16;
405 break;
406 case WPA_CIPHER_TKIP:
407 alg = WPA_ALG_TKIP;
408 keylen = 32;
409 break;
410 default:
411 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
412 sm->pairwise_cipher);
413 return -1;
414 }
415
416 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
417 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
418 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
419 return -1;
420 }
421
422 return 0;
423 }
424
425
426 /**
427 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
428 * @sm: Pointer to WPA state machine data from wpa_sm_init()
429 * Returns: 0 on success, -1 on failure
430 */
wpa_ft_prepare_auth_request(struct wpa_sm * sm)431 int wpa_ft_prepare_auth_request(struct wpa_sm *sm)
432 {
433 u8 *ft_ies;
434 size_t ft_ies_len;
435
436 /* Generate a new SNonce */
437 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
438 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
439 return -1;
440 }
441
442 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
443 NULL, sm->bssid);
444 if (ft_ies) {
445 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
446 ft_ies, ft_ies_len);
447 os_free(ft_ies);
448 }
449
450 return 0;
451 }
452
453
wpa_ft_process_response(struct wpa_sm * sm,const u8 * ies,size_t ies_len,int ft_action,const u8 * target_ap)454 int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
455 int ft_action, const u8 *target_ap)
456 {
457 u8 *ft_ies;
458 size_t ft_ies_len, ptk_len;
459 struct wpa_ft_ies parse;
460 struct rsn_mdie *mdie;
461 struct rsn_ftie *ftie;
462 u8 ptk_name[WPA_PMK_NAME_LEN];
463 int ret;
464 const u8 *bssid;
465
466 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
467
468 if (ft_action) {
469 if (!sm->over_the_ds_in_progress) {
470 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
471 "- drop FT Action Response");
472 return -1;
473 }
474
475 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
476 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
477 "with this Target AP - drop FT Action "
478 "Response");
479 return -1;
480 }
481 }
482
483 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
484 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
485 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
486 "enabled for this connection");
487 return -1;
488 }
489
490 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
491 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
492 return -1;
493 }
494
495 mdie = (struct rsn_mdie *) parse.mdie;
496 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
497 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
498 MOBILITY_DOMAIN_ID_LEN) != 0) {
499 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
500 return -1;
501 }
502
503 ftie = (struct rsn_ftie *) parse.ftie;
504 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
505 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
506 return -1;
507 }
508
509 if (parse.r0kh_id == NULL) {
510 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
511 return -1;
512 }
513
514 if (parse.r0kh_id_len != sm->r0kh_id_len ||
515 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
516 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
517 "the current R0KH-ID");
518 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
519 parse.r0kh_id, parse.r0kh_id_len);
520 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
521 sm->r0kh_id, sm->r0kh_id_len);
522 return -1;
523 }
524
525 if (parse.r1kh_id == NULL) {
526 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
527 return -1;
528 }
529
530 if (parse.rsn_pmkid == NULL ||
531 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
532 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
533 "RSNIE");
534 return -1;
535 }
536
537 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
538 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
539 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
540 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
541 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
542 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
543 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
544 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
545 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
546
547 bssid = target_ap;
548 ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64;
549 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
550 bssid, sm->pmk_r1_name,
551 (u8 *) &sm->ptk, ptk_len, ptk_name);
552 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
553 (u8 *) &sm->ptk, ptk_len);
554 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
555
556 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
557 sm->pmk_r1_name, sm->ptk.kck, bssid);
558 if (ft_ies) {
559 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
560 ft_ies, ft_ies_len);
561 os_free(ft_ies);
562 }
563
564 ret = wpa_ft_install_ptk(sm, bssid);
565
566 if (ret == 0) {
567 sm->ft_completed = 1;
568 if (ft_action) {
569 /* TODO: trigger re-association to the Target AP;
570 * MLME is now doing this automatically, but it should
571 * really be done only if we get here successfully. */
572 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
573 }
574 }
575
576 return ret;
577 }
578
579
wpa_ft_is_completed(struct wpa_sm * sm)580 int wpa_ft_is_completed(struct wpa_sm *sm)
581 {
582 if (sm == NULL)
583 return 0;
584
585 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
586 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
587 return 0;
588
589 return sm->ft_completed;
590 }
591
592
wpa_ft_process_gtk_subelem(struct wpa_sm * sm,const u8 * gtk_elem,size_t gtk_elem_len)593 static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
594 size_t gtk_elem_len)
595 {
596 u8 gtk[32];
597 int keyidx;
598 wpa_alg alg;
599 size_t gtk_len, keylen, rsc_len;
600
601 if (gtk_elem == NULL) {
602 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
603 return 0;
604 }
605
606 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
607 gtk_elem, gtk_elem_len);
608
609 if (gtk_elem_len < 10 + 24 || (gtk_elem_len - 10) % 8 ||
610 gtk_elem_len - 18 > sizeof(gtk)) {
611 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
612 "length %lu", (unsigned long) gtk_elem_len);
613 return -1;
614 }
615 gtk_len = gtk_elem_len - 18;
616 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 10, gtk)) {
617 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
618 "decrypt GTK");
619 return -1;
620 }
621
622 switch (sm->group_cipher) {
623 case WPA_CIPHER_CCMP:
624 keylen = 16;
625 rsc_len = 6;
626 alg = WPA_ALG_CCMP;
627 break;
628 case WPA_CIPHER_TKIP:
629 keylen = 32;
630 rsc_len = 6;
631 alg = WPA_ALG_TKIP;
632 break;
633 case WPA_CIPHER_WEP104:
634 keylen = 13;
635 rsc_len = 0;
636 alg = WPA_ALG_WEP;
637 break;
638 case WPA_CIPHER_WEP40:
639 keylen = 5;
640 rsc_len = 0;
641 alg = WPA_ALG_WEP;
642 break;
643 default:
644 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
645 sm->group_cipher);
646 return -1;
647 }
648
649 if (gtk_len < keylen) {
650 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
651 return -1;
652 }
653
654 /* Key Info[1] | Key Length[1] | RSC[8] | Key[5..32]. */
655
656 keyidx = gtk_elem[0] & 0x03;
657
658 if (gtk_elem[1] != keylen) {
659 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
660 "negotiated %lu",
661 gtk_elem[1], (unsigned long) keylen);
662 return -1;
663 }
664
665 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
666 if (wpa_sm_set_key(sm, alg, (u8 *) "\xff\xff\xff\xff\xff\xff",
667 keyidx, 0, gtk_elem + 2, rsc_len, gtk, keylen) <
668 0) {
669 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
670 "driver.");
671 return -1;
672 }
673
674 return 0;
675 }
676
677
678 #ifdef CONFIG_IEEE80211W
wpa_ft_process_igtk_subelem(struct wpa_sm * sm,const u8 * igtk_elem,size_t igtk_elem_len)679 static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
680 size_t igtk_elem_len)
681 {
682 u8 igtk[WPA_IGTK_LEN];
683 u16 keyidx;
684
685 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
686 return 0;
687
688 if (igtk_elem == NULL) {
689 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
690 return 0;
691 }
692
693 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
694 igtk_elem, igtk_elem_len);
695
696 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
697 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
698 "length %lu", (unsigned long) igtk_elem_len);
699 return -1;
700 }
701 if (igtk_elem[8] != WPA_IGTK_LEN) {
702 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
703 "%d", igtk_elem[8]);
704 return -1;
705 }
706
707 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
708 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
709 "decrypt IGTK");
710 return -1;
711 }
712
713 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
714
715 keyidx = WPA_GET_LE16(igtk_elem);
716
717 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
718 WPA_IGTK_LEN);
719 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, (u8 *) "\xff\xff\xff\xff\xff\xff",
720 keyidx, 0, igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) <
721 0) {
722 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
723 "driver.");
724 return -1;
725 }
726
727 return 0;
728 }
729 #endif /* CONFIG_IEEE80211W */
730
731
wpa_ft_validate_reassoc_resp(struct wpa_sm * sm,const u8 * ies,size_t ies_len,const u8 * src_addr)732 int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
733 size_t ies_len, const u8 *src_addr)
734 {
735 struct wpa_ft_ies parse;
736 struct rsn_mdie *mdie;
737 struct rsn_ftie *ftie;
738 size_t count;
739 u8 mic[16];
740
741 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
742
743 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
744 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
745 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
746 "enabled for this connection");
747 return -1;
748 }
749
750 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
751 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
752 return -1;
753 }
754
755 mdie = (struct rsn_mdie *) parse.mdie;
756 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
757 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
758 MOBILITY_DOMAIN_ID_LEN) != 0) {
759 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
760 return -1;
761 }
762
763 ftie = (struct rsn_ftie *) parse.ftie;
764 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
765 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
766 return -1;
767 }
768
769 if (parse.r0kh_id == NULL) {
770 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
771 return -1;
772 }
773
774 if (parse.r0kh_id_len != sm->r0kh_id_len ||
775 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
776 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
777 "the current R0KH-ID");
778 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
779 parse.r0kh_id, parse.r0kh_id_len);
780 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
781 sm->r0kh_id, sm->r0kh_id_len);
782 return -1;
783 }
784
785 if (parse.r1kh_id == NULL) {
786 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
787 return -1;
788 }
789
790 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
791 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
792 "ReassocResp");
793 return -1;
794 }
795
796 if (parse.rsn_pmkid == NULL ||
797 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
798 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
799 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
800 return -1;
801 }
802
803 count = 3;
804 if (parse.tie)
805 count++;
806
807 if (ftie->mic_control[1] != count) {
808 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in FTIE (%d)",
809 ftie->mic_control[1]);
810 return -1;
811 }
812
813 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
814 parse.mdie - 2, parse.mdie_len + 2,
815 parse.ftie - 2, parse.ftie_len + 2,
816 parse.rsn - 2, parse.rsn_len + 2, NULL, 0,
817 mic) < 0) {
818 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
819 return -1;
820 }
821
822 if (os_memcmp(mic, ftie->mic, 16) != 0) {
823 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
824 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
825 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
826 return -1;
827 }
828
829 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
830 return -1;
831
832 #ifdef CONFIG_IEEE80211W
833 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
834 return -1;
835 #endif /* CONFIG_IEEE80211W */
836
837 return 0;
838 }
839
840
841 /**
842 * wpa_ft_start_over_ds - Generate over-the-DS auth request
843 * @sm: Pointer to WPA state machine data from wpa_sm_init()
844 * Returns: 0 on success, -1 on failure
845 */
wpa_ft_start_over_ds(struct wpa_sm * sm,const u8 * target_ap)846 int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap)
847 {
848 u8 *ft_ies;
849 size_t ft_ies_len;
850
851 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
852 MAC2STR(target_ap));
853
854 /* Generate a new SNonce */
855 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
856 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
857 return -1;
858 }
859
860 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
861 NULL, target_ap);
862 if (ft_ies) {
863 sm->over_the_ds_in_progress = 1;
864 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
865 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
866 os_free(ft_ies);
867 }
868
869 return 0;
870 }
871
872 #endif /* CONFIG_IEEE80211R */
873