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FT: Add RIC Request generation and validation (but not processing)
[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 *
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"
babfbf15 23#include "ieee802_11_common.h"
6fc6879b
JM		 24
25#ifdef CONFIG_IEEE80211R
26
27int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
28 const struct wpa_eapol_key *key,
29 struct wpa_ptk *ptk)
30{
31 u8 pmk_r1_name[WPA_PMK_NAME_LEN];
32 u8 ptk_name[WPA_PMK_NAME_LEN];
33 const u8 *anonce = key->key_nonce;
34
35 if (sm->xxkey_len == 0) {
36 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
37 "derivation");
38 return -1;
39 }
40
41 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
42 sm->ssid_len, sm->mobility_domain,
43 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
44 sm->pmk_r0, sm->pmk_r0_name);
45 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
46 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
47 sm->pmk_r0_name, WPA_PMK_NAME_LEN);
48 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
49 sm->own_addr, sm->pmk_r1, pmk_r1_name);
50 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
51 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
52 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
53 sm->bssid, pmk_r1_name,
54 (u8 *) ptk, sizeof(*ptk), ptk_name);
55 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, sizeof(*ptk));
56 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
57
58 return 0;
59}
60
61
62/**
63 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
64 * @sm: Pointer to WPA state machine data from wpa_sm_init()
65 * @mobility_domain: Mobility domain identifier (2 octets)
66 * @r0kh_id: PMK-R0 key holder identity (1-48 octets)
67 * @r0kh_id_len: R0KH-ID length (1-48)
68 * @r1kh_id: PMK-R1 key holder identity (16 octets)
69 * Returns: 0 on success, -1 on failure
70 */
71int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *mobility_domain,
72 const u8 *r0kh_id, size_t r0kh_id_len,
73 const u8 *r1kh_id)
74{
75 if (sm && mobility_domain) {
76 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
77 mobility_domain, MOBILITY_DOMAIN_ID_LEN);
78 os_memcpy(sm->mobility_domain, mobility_domain,
79 MOBILITY_DOMAIN_ID_LEN);
80 } else if (sm)
81 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
82
83 if (sm && r0kh_id) {
84 if (r0kh_id_len > FT_R0KH_ID_MAX_LEN)
85 return -1;
86 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", r0kh_id, r0kh_id_len);
87 os_memcpy(sm->r0kh_id, r0kh_id, r0kh_id_len);
88 sm->r0kh_id_len = r0kh_id_len;
89 } else if (sm) {
90 /* FIX: When should R0KH-ID be cleared? We need to keep the
91 * old R0KH-ID in order to be able to use this during FT. */
92 /*
93 * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN);
94 * sm->r0kh_id_len = 0;
95 */
96 }
97
98 if (sm && r1kh_id) {
99 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", r1kh_id, FT_R1KH_ID_LEN);
100 os_memcpy(sm->r1kh_id, r1kh_id, FT_R1KH_ID_LEN);
101 } else if (sm)
102 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
103
104 return 0;
105}
106
107
108/**
babfbf15 109 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
6fc6879b
JM		 110 * @sm: Pointer to WPA state machine data from wpa_sm_init()
111 * @len: Buffer for returning the length of the IEs
112 * @anonce: ANonce or %NULL if not yet available
113 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
114 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
115 * @target_ap: Target AP address
babfbf15
JM		 116 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
117 * @ric_ies_len: Length of ric_ies buffer in octets
6fc6879b
JM		 118 * Returns: Pointer to buffer with IEs or %NULL on failure
119 *
120 * Caller is responsible for freeing the returned buffer with os_free();
121 */
122static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
123 const u8 *anonce, const u8 *pmk_name,
babfbf15
JM		 124 const u8 *kck, const u8 *target_ap,
125 const u8 *ric_ies, size_t ric_ies_len)
6fc6879b
JM		 126{
127 size_t buf_len;
ccfab35a 128 u8 *buf, *pos, *ftie_len, *ftie_pos;
6fc6879b
JM		 129 struct rsn_mdie *mdie;
130 struct rsn_ftie *ftie;
131 struct rsn_ie_hdr *rsnie;
132 u16 capab;
133
134 sm->ft_completed = 0;
135
136 buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
babfbf15 137 2 + sm->r0kh_id_len + ric_ies_len + 100;
6fc6879b
JM		 138 buf = os_zalloc(buf_len);
139 if (buf == NULL)
140 return NULL;
141 pos = buf;
142
babfbf15 143 /* RSNIE[PMKR0Name/PMKR1Name] */
6fc6879b
JM		 144 rsnie = (struct rsn_ie_hdr *) pos;
145 rsnie->elem_id = WLAN_EID_RSN;
146 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
147 pos = (u8 *) (rsnie + 1);
148
149 /* Group Suite Selector */
150 if (sm->group_cipher == WPA_CIPHER_CCMP)
151 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
152 else if (sm->group_cipher == WPA_CIPHER_TKIP)
153 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
154 else {
155 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
156 sm->group_cipher);
157 os_free(buf);
158 return NULL;
159 }
160 pos += RSN_SELECTOR_LEN;
161
162 /* Pairwise Suite Count */
163 WPA_PUT_LE16(pos, 1);
164 pos += 2;
165
166 /* Pairwise Suite List */
167 if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
168 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
169 else if (sm->pairwise_cipher == WPA_CIPHER_TKIP)
170 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
171 else {
172 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
173 sm->pairwise_cipher);
174 os_free(buf);
175 return NULL;
176 }
177 pos += RSN_SELECTOR_LEN;
178
179 /* Authenticated Key Management Suite Count */
180 WPA_PUT_LE16(pos, 1);
181 pos += 2;
182
183 /* Authenticated Key Management Suite List */
184 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
185 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
186 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
187 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
188 else {
189 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
190 sm->key_mgmt);
191 os_free(buf);
192 return NULL;
193 }
194 pos += RSN_SELECTOR_LEN;
195
196 /* RSN Capabilities */
197 capab = 0;
198#ifdef CONFIG_IEEE80211W
199 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
0b60b0aa 200 capab |= WPA_CAPABILITY_MFPC;
6fc6879b
JM		 201#endif /* CONFIG_IEEE80211W */
202 WPA_PUT_LE16(pos, capab);
203 pos += 2;
204
205 /* PMKID Count */
206 WPA_PUT_LE16(pos, 1);
207 pos += 2;
208
209 /* PMKID List [PMKR0Name/PMKR1Name] */
210 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
211 pos += WPA_PMK_NAME_LEN;
212
213#ifdef CONFIG_IEEE80211W
214 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
215 /* Management Group Cipher Suite */
216 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
217 pos += RSN_SELECTOR_LEN;
218 }
219#endif /* CONFIG_IEEE80211W */
220
221 rsnie->len = (pos - (u8 *) rsnie) - 2;
222
223 /* MDIE */
224 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
225 *pos++ = sizeof(*mdie);
226 mdie = (struct rsn_mdie *) pos;
227 pos += sizeof(*mdie);
228 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
229 MOBILITY_DOMAIN_ID_LEN);
230 mdie->ft_capab = 0; /* FIX: copy from the target AP's MDIE */
231
232 /* FTIE[SNonce, R0KH-ID] */
ccfab35a 233 ftie_pos = pos;
6fc6879b
JM		 234 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
235 ftie_len = pos++;
236 ftie = (struct rsn_ftie *) pos;
237 pos += sizeof(*ftie);
238 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
239 if (anonce)
240 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
241 /* R0KH-ID sub-element */
242 *pos++ = FTIE_SUBELEM_R0KH_ID;
243 *pos++ = sm->r0kh_id_len;
244 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
245 pos += sm->r0kh_id_len;
246 *ftie_len = pos - ftie_len - 1;
247
babfbf15
JM		 248 if (ric_ies) {
249 /* RIC Request */
250 os_memcpy(pos, ric_ies, ric_ies_len);
251 pos += ric_ies_len;
252 }
253
6fc6879b
JM		 254 if (kck) {
255 /*
c1e033b0 256 * IEEE Std 802.11r-2008, 11A.8.4
6fc6879b
JM		 257 * MIC shall be calculated over:
258 * non-AP STA MAC address
259 * Target AP MAC address
260 * Transaction seq number (5 for ReassocReq, 3 otherwise)
261 * RSN IE
262 * MDIE
263 * FTIE (with MIC field set to 0)
264 * RIC-Request (if present)
265 */
babfbf15
JM		 266 /* Information element count */
267 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
268 ric_ies_len);
6fc6879b
JM		 269 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
270 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
ccfab35a 271 ftie_pos, 2 + *ftie_len,
babfbf15
JM		 272 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
273 ric_ies_len, ftie->mic) < 0) {
6fc6879b
JM		 274 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
275 os_free(buf);
276 return NULL;
277 }
278 }
279
280 *len = pos - buf;
281
282 return buf;
283}
284
285
286struct wpa_ft_ies {
287 const u8 *mdie;
288 size_t mdie_len;
289 const u8 *ftie;
290 size_t ftie_len;
291 const u8 *r1kh_id;
292 const u8 *gtk;
293 size_t gtk_len;
294 const u8 *r0kh_id;
295 size_t r0kh_id_len;
296 const u8 *rsn;
297 size_t rsn_len;
298 const u8 *rsn_pmkid;
299 const u8 *tie;
300 size_t tie_len;
b27f13ed
JM		 301 const u8 *igtk;
302 size_t igtk_len;
6fc6879b
JM		 303};
304
305
306static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
307 struct wpa_ft_ies *parse)
308{
309 const u8 *end, *pos;
310
311 parse->ftie = ie;
312 parse->ftie_len = ie_len;
313
314 pos = ie + sizeof(struct rsn_ftie);
315 end = ie + ie_len;
316
317 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
318 switch (pos[0]) {
319 case FTIE_SUBELEM_R1KH_ID:
320 if (pos[1] != FT_R1KH_ID_LEN) {
321 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
322 "length in FTIE: %d", pos[1]);
323 return -1;
324 }
325 parse->r1kh_id = pos + 2;
326 break;
327 case FTIE_SUBELEM_GTK:
328 parse->gtk = pos + 2;
329 parse->gtk_len = pos[1];
330 break;
331 case FTIE_SUBELEM_R0KH_ID:
332 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
333 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
334 "length in FTIE: %d", pos[1]);
335 return -1;
336 }
337 parse->r0kh_id = pos + 2;
338 parse->r0kh_id_len = pos[1];
339 break;
b27f13ed
JM		 340#ifdef CONFIG_IEEE80211W
341 case FTIE_SUBELEM_IGTK:
342 parse->igtk = pos + 2;
343 parse->igtk_len = pos[1];
344 break;
345#endif /* CONFIG_IEEE80211W */
6fc6879b
JM		 346 }
347
348 pos += 2 + pos[1];
349 }
350
351 return 0;
352}
353
354
355static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
356 struct wpa_ft_ies *parse)
357{
358 const u8 *end, *pos;
359 struct wpa_ie_data data;
360 int ret;
361
362 os_memset(parse, 0, sizeof(*parse));
363 if (ies == NULL)
364 return 0;
365
366 pos = ies;
367 end = ies + ies_len;
368 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
369 switch (pos[0]) {
370 case WLAN_EID_RSN:
371 parse->rsn = pos + 2;
372 parse->rsn_len = pos[1];
373 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
374 parse->rsn_len + 2,
375 &data);
376 if (ret < 0) {
377 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
378 "RSN IE: %d", ret);
379 return -1;
380 }
381 if (data.num_pmkid == 1 && data.pmkid)
382 parse->rsn_pmkid = data.pmkid;
383 break;
384 case WLAN_EID_MOBILITY_DOMAIN:
385 parse->mdie = pos + 2;
386 parse->mdie_len = pos[1];
387 break;
388 case WLAN_EID_FAST_BSS_TRANSITION:
389 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
390 return -1;
391 break;
392 case WLAN_EID_TIMEOUT_INTERVAL:
393 parse->tie = pos + 2;
394 parse->tie_len = pos[1];
395 break;
396 }
397
398 pos += 2 + pos[1];
399 }
400
401 return 0;
402}
403
404
405static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
406{
407 int keylen;
408 wpa_alg alg;
409 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
410
411 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
412
413 switch (sm->pairwise_cipher) {
414 case WPA_CIPHER_CCMP:
415 alg = WPA_ALG_CCMP;
416 keylen = 16;
417 break;
418 case WPA_CIPHER_TKIP:
419 alg = WPA_ALG_TKIP;
420 keylen = 32;
421 break;
422 default:
423 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
424 sm->pairwise_cipher);
425 return -1;
426 }
427
428 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
429 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
430 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
431 return -1;
432 }
433
434 return 0;
435}
436
437
438/**
439 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
440 * @sm: Pointer to WPA state machine data from wpa_sm_init()
441 * Returns: 0 on success, -1 on failure
442 */
443int wpa_ft_prepare_auth_request(struct wpa_sm *sm)
444{
445 u8 *ft_ies;
446 size_t ft_ies_len;
447
448 /* Generate a new SNonce */
449 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
450 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
451 return -1;
452 }
453
454 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
babfbf15 455 NULL, sm->bssid, NULL, 0);
6fc6879b
JM		 456 if (ft_ies) {
457 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
458 ft_ies, ft_ies_len);
459 os_free(ft_ies);
460 }
461
462 return 0;
463}
464
465
466int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
babfbf15
JM		 467 int ft_action, const u8 *target_ap,
468 const u8 *ric_ies, size_t ric_ies_len)
6fc6879b
JM		 469{
470 u8 *ft_ies;
471 size_t ft_ies_len;
472 struct wpa_ft_ies parse;
473 struct rsn_mdie *mdie;
474 struct rsn_ftie *ftie;
475 u8 ptk_name[WPA_PMK_NAME_LEN];
476 int ret;
477 const u8 *bssid;
478
479 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
babfbf15 480 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
6fc6879b
JM		 481
482 if (ft_action) {
483 if (!sm->over_the_ds_in_progress) {
484 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
485 "- drop FT Action Response");
486 return -1;
487 }
488
489 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
490 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
491 "with this Target AP - drop FT Action "
492 "Response");
493 return -1;
494 }
495 }
496
497 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
498 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
499 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
500 "enabled for this connection");
501 return -1;
502 }
503
504 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
505 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
506 return -1;
507 }
508
509 mdie = (struct rsn_mdie *) parse.mdie;
510 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
511 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
512 MOBILITY_DOMAIN_ID_LEN) != 0) {
513 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
514 return -1;
515 }
516
517 ftie = (struct rsn_ftie *) parse.ftie;
518 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
519 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
520 return -1;
521 }
522
523 if (parse.r0kh_id == NULL) {
524 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
525 return -1;
526 }
527
528 if (parse.r0kh_id_len != sm->r0kh_id_len ||
529 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
530 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
531 "the current R0KH-ID");
532 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
533 parse.r0kh_id, parse.r0kh_id_len);
534 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
535 sm->r0kh_id, sm->r0kh_id_len);
536 return -1;
537 }
538
539 if (parse.r1kh_id == NULL) {
540 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
541 return -1;
542 }
543
544 if (parse.rsn_pmkid == NULL ||
545 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
546 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
547 "RSNIE");
548 return -1;
549 }
550
551 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
552 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
553 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
554 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
555 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
556 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
557 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
558 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
559 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
560
658d1662 561 bssid = target_ap;
6fc6879b
JM		 562 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
563 bssid, sm->pmk_r1_name,
564 (u8 *) &sm->ptk, sizeof(sm->ptk), ptk_name);
565 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
566 (u8 *) &sm->ptk, sizeof(sm->ptk));
567 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
568
569 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
babfbf15
JM		 570 sm->pmk_r1_name, sm->ptk.kck, bssid,
571 ric_ies, ric_ies_len);
6fc6879b
JM		 572 if (ft_ies) {
573 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
574 ft_ies, ft_ies_len);
575 os_free(ft_ies);
576 }
577
578 ret = wpa_ft_install_ptk(sm, bssid);
579
580 if (ret == 0) {
581 sm->ft_completed = 1;
582 if (ft_action) {
583 /* TODO: trigger re-association to the Target AP;
584 * MLME is now doing this automatically, but it should
585 * really be done only if we get here successfully. */
586 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
587 }
588 }
589
590 return ret;
591}
592
593
594int wpa_ft_is_completed(struct wpa_sm *sm)
595{
596 if (sm == NULL)
597 return 0;
598
599 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
600 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
601 return 0;
602
603 return sm->ft_completed;
604}
605
606
b27f13ed
JM		 607static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
608 size_t gtk_elem_len)
609{
610 u8 gtk[32];
611 int keyidx;
612 wpa_alg alg;
613 size_t gtk_len, keylen, rsc_len;
614
615 if (gtk_elem == NULL) {
616 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
617 return 0;
618 }
619
620 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
621 gtk_elem, gtk_elem_len);
622
623 if (gtk_elem_len < 10 + 24 || (gtk_elem_len - 10) % 8 ||
624 gtk_elem_len - 18 > sizeof(gtk)) {
625 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
626 "length %lu", (unsigned long) gtk_elem_len);
627 return -1;
628 }
629 gtk_len = gtk_elem_len - 18;
630 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 10, gtk)) {
631 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
632 "decrypt GTK");
633 return -1;
634 }
635
636 switch (sm->group_cipher) {
637 case WPA_CIPHER_CCMP:
638 keylen = 16;
639 rsc_len = 6;
640 alg = WPA_ALG_CCMP;
641 break;
642 case WPA_CIPHER_TKIP:
643 keylen = 32;
644 rsc_len = 6;
645 alg = WPA_ALG_TKIP;
646 break;
647 case WPA_CIPHER_WEP104:
648 keylen = 13;
649 rsc_len = 0;
650 alg = WPA_ALG_WEP;
651 break;
652 case WPA_CIPHER_WEP40:
653 keylen = 5;
654 rsc_len = 0;
655 alg = WPA_ALG_WEP;
656 break;
657 default:
658 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
659 sm->group_cipher);
660 return -1;
661 }
662
663 if (gtk_len < keylen) {
664 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
665 return -1;
666 }
667
668 /* Key Info[1] | Key Length[1] | RSC[8] | Key[5..32]. */
669
670 keyidx = gtk_elem[0] & 0x03;
671
672 if (gtk_elem[1] != keylen) {
673 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
674 "negotiated %lu",
675 gtk_elem[1], (unsigned long) keylen);
676 return -1;
677 }
678
679 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
680 if (wpa_sm_set_key(sm, alg, (u8 *) "\xff\xff\xff\xff\xff\xff",
681 keyidx, 0, gtk_elem + 2, rsc_len, gtk, keylen) <
682 0) {
683 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
684 "driver.");
685 return -1;
686 }
687
688 return 0;
689}
690
691
692#ifdef CONFIG_IEEE80211W
693static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
694 size_t igtk_elem_len)
695{
696 u8 igtk[WPA_IGTK_LEN];
697 u16 keyidx;
698
699 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
700 return 0;
701
702 if (igtk_elem == NULL) {
703 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
704 return 0;
705 }
706
707 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
708 igtk_elem, igtk_elem_len);
709
ff89afb7 710 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
b27f13ed
JM		 711 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
712 "length %lu", (unsigned long) igtk_elem_len);
713 return -1;
714 }
ff89afb7
JM		 715 if (igtk_elem[8] != WPA_IGTK_LEN) {
716 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
717 "%d", igtk_elem[8]);
718 return -1;
719 }
720
721 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
b27f13ed
JM		 722 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
723 "decrypt IGTK");
724 return -1;
725 }
726
ff89afb7 727 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
b27f13ed
JM		 728
729 keyidx = WPA_GET_LE16(igtk_elem);
730
731 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
732 WPA_IGTK_LEN);
733 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, (u8 *) "\xff\xff\xff\xff\xff\xff",
734 keyidx, 0, igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) <
735 0) {
736 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
737 "driver.");
738 return -1;
739 }
740
741 return 0;
742}
743#endif /* CONFIG_IEEE80211W */
744
745
6fc6879b 746int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
658d1662 747 size_t ies_len, const u8 *src_addr)
6fc6879b
JM		 748{
749 struct wpa_ft_ies parse;
750 struct rsn_mdie *mdie;
751 struct rsn_ftie *ftie;
b27f13ed 752 size_t count;
6fc6879b 753 u8 mic[16];
6fc6879b
JM		 754
755 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
756
757 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
758 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
759 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
760 "enabled for this connection");
761 return -1;
762 }
763
764 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
765 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
766 return -1;
767 }
768
769 mdie = (struct rsn_mdie *) parse.mdie;
770 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
771 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
772 MOBILITY_DOMAIN_ID_LEN) != 0) {
773 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
774 return -1;
775 }
776
777 ftie = (struct rsn_ftie *) parse.ftie;
778 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
779 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
780 return -1;
781 }
782
783 if (parse.r0kh_id == NULL) {
784 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
785 return -1;
786 }
787
788 if (parse.r0kh_id_len != sm->r0kh_id_len ||
789 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
790 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
791 "the current R0KH-ID");
792 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
793 parse.r0kh_id, parse.r0kh_id_len);
794 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
795 sm->r0kh_id, sm->r0kh_id_len);
796 return -1;
797 }
798
799 if (parse.r1kh_id == NULL) {
800 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
801 return -1;
802 }
803
804 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
805 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
806 "ReassocResp");
807 return -1;
808 }
809
810 if (parse.rsn_pmkid == NULL ||
811 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
812 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
813 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
814 return -1;
815 }
816
817 count = 3;
818 if (parse.tie)
819 count++;
820
821 if (ftie->mic_control[1] != count) {
822 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in FTIE (%d)",
823 ftie->mic_control[1]);
824 return -1;
825 }
826
658d1662 827 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
6fc6879b
JM		 828 parse.mdie - 2, parse.mdie_len + 2,
829 parse.ftie - 2, parse.ftie_len + 2,
830 parse.rsn - 2, parse.rsn_len + 2, NULL, 0,
831 mic) < 0) {
832 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
833 return -1;
834 }
835
836 if (os_memcmp(mic, ftie->mic, 16) != 0) {
837 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
838 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
839 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
840 return -1;
841 }
842
b27f13ed 843 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
6fc6879b 844 return -1;
6fc6879b 845
b27f13ed
JM		 846#ifdef CONFIG_IEEE80211W
847 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
6fc6879b 848 return -1;
b27f13ed 849#endif /* CONFIG_IEEE80211W */
6fc6879b
JM		 850
851 return 0;
852}
853
854
855/**
856 * wpa_ft_start_over_ds - Generate over-the-DS auth request
857 * @sm: Pointer to WPA state machine data from wpa_sm_init()
858 * Returns: 0 on success, -1 on failure
859 */
860int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap)
861{
862 u8 *ft_ies;
863 size_t ft_ies_len;
864
865 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
866 MAC2STR(target_ap));
867
868 /* Generate a new SNonce */
869 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
870 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
871 return -1;
872 }
873
874 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
babfbf15 875 NULL, target_ap, NULL, 0);
6fc6879b
JM		 876 if (ft_ies) {
877 sm->over_the_ds_in_progress = 1;
878 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
879 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
880 os_free(ft_ies);
881 }
882
883 return 0;
884}
885
886#endif /* CONFIG_IEEE80211R */
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