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FT: Request reassociation after successful FT Action frame exchange
[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"
03da66bd
JM		 18#include "crypto/aes_wrap.h"
19#include "common/ieee802_11_defs.h"
20#include "common/ieee802_11_common.h"
6fc6879b
JM		 21#include "wpa.h"
22#include "wpa_i.h"
23#include "wpa_ie.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,
c0a61908 29 struct wpa_ptk *ptk, size_t ptk_len)
6fc6879b
JM		 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,
c0a61908
JM		 54 (u8 *) ptk, ptk_len, ptk_name);
55 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
6fc6879b
JM		 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;
f238cf9f
JM		 303 const u8 *ric;
304 size_t ric_len;
6fc6879b
JM		 305};
306
307
308static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
309 struct wpa_ft_ies *parse)
310{
311 const u8 *end, *pos;
312
313 parse->ftie = ie;
314 parse->ftie_len = ie_len;
315
316 pos = ie + sizeof(struct rsn_ftie);
317 end = ie + ie_len;
318
319 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
320 switch (pos[0]) {
321 case FTIE_SUBELEM_R1KH_ID:
322 if (pos[1] != FT_R1KH_ID_LEN) {
323 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
324 "length in FTIE: %d", pos[1]);
325 return -1;
326 }
327 parse->r1kh_id = pos + 2;
328 break;
329 case FTIE_SUBELEM_GTK:
330 parse->gtk = pos + 2;
331 parse->gtk_len = pos[1];
332 break;
333 case FTIE_SUBELEM_R0KH_ID:
334 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
335 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
336 "length in FTIE: %d", pos[1]);
337 return -1;
338 }
339 parse->r0kh_id = pos + 2;
340 parse->r0kh_id_len = pos[1];
341 break;
b27f13ed
JM		 342#ifdef CONFIG_IEEE80211W
343 case FTIE_SUBELEM_IGTK:
344 parse->igtk = pos + 2;
345 parse->igtk_len = pos[1];
346 break;
347#endif /* CONFIG_IEEE80211W */
6fc6879b
JM		 348 }
349
350 pos += 2 + pos[1];
351 }
352
353 return 0;
354}
355
356
357static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
358 struct wpa_ft_ies *parse)
359{
360 const u8 *end, *pos;
361 struct wpa_ie_data data;
362 int ret;
f238cf9f
JM		 363 const struct rsn_ftie *ftie;
364 int prot_ie_count = 0;
6fc6879b
JM		 365
366 os_memset(parse, 0, sizeof(*parse));
367 if (ies == NULL)
368 return 0;
369
370 pos = ies;
371 end = ies + ies_len;
372 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
373 switch (pos[0]) {
374 case WLAN_EID_RSN:
375 parse->rsn = pos + 2;
376 parse->rsn_len = pos[1];
377 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
378 parse->rsn_len + 2,
379 &data);
380 if (ret < 0) {
381 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
382 "RSN IE: %d", ret);
383 return -1;
384 }
385 if (data.num_pmkid == 1 && data.pmkid)
386 parse->rsn_pmkid = data.pmkid;
387 break;
388 case WLAN_EID_MOBILITY_DOMAIN:
389 parse->mdie = pos + 2;
390 parse->mdie_len = pos[1];
391 break;
392 case WLAN_EID_FAST_BSS_TRANSITION:
f238cf9f
JM		 393 if (pos[1] < sizeof(*ftie))
394 return -1;
395 ftie = (const struct rsn_ftie *) (pos + 2);
396 prot_ie_count = ftie->mic_control[1];
6fc6879b
JM		 397 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
398 return -1;
399 break;
400 case WLAN_EID_TIMEOUT_INTERVAL:
401 parse->tie = pos + 2;
402 parse->tie_len = pos[1];
403 break;
f238cf9f
JM		 404 case WLAN_EID_RIC_DATA:
405 if (parse->ric == NULL)
406 parse->ric = pos;
6fc6879b
JM		 407 }
408
409 pos += 2 + pos[1];
410 }
411
f238cf9f
JM		 412 if (prot_ie_count == 0)
413 return 0; /* no MIC */
414
415 /*
416 * Check that the protected IE count matches with IEs included in the
417 * frame.
418 */
419 if (parse->rsn)
420 prot_ie_count--;
421 if (parse->mdie)
422 prot_ie_count--;
423 if (parse->ftie)
424 prot_ie_count--;
425 if (parse->tie)
426 prot_ie_count--;
427 if (prot_ie_count < 0) {
428 wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in "
429 "the protected IE count");
430 return -1;
431 }
432
433 if (prot_ie_count == 0 && parse->ric) {
434 wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not "
435 "included in protected IE count");
436 return -1;
437 }
438
439 /* Determine the end of the RIC IE(s) */
440 pos = parse->ric;
441 while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end &&
442 prot_ie_count) {
443 prot_ie_count--;
444 pos += 2 + pos[1];
445 }
446 parse->ric_len = pos - parse->ric;
447 if (prot_ie_count) {
448 wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from "
449 "frame", (int) prot_ie_count);
450 return -1;
451 }
452
6fc6879b
JM		 453 return 0;
454}
455
456
457static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
458{
459 int keylen;
71934751 460 enum wpa_alg alg;
6fc6879b
JM		 461 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
462
463 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
464
465 switch (sm->pairwise_cipher) {
466 case WPA_CIPHER_CCMP:
467 alg = WPA_ALG_CCMP;
468 keylen = 16;
469 break;
470 case WPA_CIPHER_TKIP:
471 alg = WPA_ALG_TKIP;
472 keylen = 32;
473 break;
474 default:
475 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
476 sm->pairwise_cipher);
477 return -1;
478 }
479
480 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
481 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
482 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
483 return -1;
484 }
485
486 return 0;
487}
488
489
490/**
491 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
492 * @sm: Pointer to WPA state machine data from wpa_sm_init()
493 * Returns: 0 on success, -1 on failure
494 */
495int wpa_ft_prepare_auth_request(struct wpa_sm *sm)
496{
497 u8 *ft_ies;
498 size_t ft_ies_len;
499
500 /* Generate a new SNonce */
501 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
502 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
503 return -1;
504 }
505
506 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
babfbf15 507 NULL, sm->bssid, NULL, 0);
6fc6879b
JM		 508 if (ft_ies) {
509 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
510 ft_ies, ft_ies_len);
511 os_free(ft_ies);
512 }
513
514 return 0;
515}
516
517
518int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
babfbf15
JM		 519 int ft_action, const u8 *target_ap,
520 const u8 *ric_ies, size_t ric_ies_len)
6fc6879b
JM		 521{
522 u8 *ft_ies;
c0a61908 523 size_t ft_ies_len, ptk_len;
6fc6879b
JM		 524 struct wpa_ft_ies parse;
525 struct rsn_mdie *mdie;
526 struct rsn_ftie *ftie;
527 u8 ptk_name[WPA_PMK_NAME_LEN];
528 int ret;
529 const u8 *bssid;
530
531 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
babfbf15 532 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
6fc6879b
JM		 533
534 if (ft_action) {
535 if (!sm->over_the_ds_in_progress) {
536 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
537 "- drop FT Action Response");
538 return -1;
539 }
540
541 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
542 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
543 "with this Target AP - drop FT Action "
544 "Response");
545 return -1;
546 }
547 }
548
549 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
550 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
551 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
552 "enabled for this connection");
553 return -1;
554 }
555
556 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
557 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
558 return -1;
559 }
560
561 mdie = (struct rsn_mdie *) parse.mdie;
562 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
563 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
564 MOBILITY_DOMAIN_ID_LEN) != 0) {
565 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
566 return -1;
567 }
568
569 ftie = (struct rsn_ftie *) parse.ftie;
570 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
571 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
572 return -1;
573 }
574
575 if (parse.r0kh_id == NULL) {
576 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
577 return -1;
578 }
579
580 if (parse.r0kh_id_len != sm->r0kh_id_len ||
581 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
582 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
583 "the current R0KH-ID");
584 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
585 parse.r0kh_id, parse.r0kh_id_len);
586 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
587 sm->r0kh_id, sm->r0kh_id_len);
588 return -1;
589 }
590
591 if (parse.r1kh_id == NULL) {
592 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
593 return -1;
594 }
595
596 if (parse.rsn_pmkid == NULL ||
597 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
598 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
599 "RSNIE");
600 return -1;
601 }
602
603 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
604 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
605 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
606 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
607 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
608 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
609 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
610 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
611 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
612
658d1662 613 bssid = target_ap;
c0a61908 614 ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64;
6fc6879b
JM		 615 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
616 bssid, sm->pmk_r1_name,
c0a61908 617 (u8 *) &sm->ptk, ptk_len, ptk_name);
6fc6879b 618 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
c0a61908 619 (u8 *) &sm->ptk, ptk_len);
6fc6879b
JM		 620 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
621
622 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
babfbf15
JM		 623 sm->pmk_r1_name, sm->ptk.kck, bssid,
624 ric_ies, ric_ies_len);
6fc6879b
JM		 625 if (ft_ies) {
626 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
627 ft_ies, ft_ies_len);
628 os_free(ft_ies);
629 }
630
631 ret = wpa_ft_install_ptk(sm, bssid);
632
633 if (ret == 0) {
634 sm->ft_completed = 1;
635 if (ft_action) {
636 /* TODO: trigger re-association to the Target AP;
637 * MLME is now doing this automatically, but it should
638 * really be done only if we get here successfully. */
639 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
640 }
641 }
642
643 return ret;
644}
645
646
647int wpa_ft_is_completed(struct wpa_sm *sm)
648{
649 if (sm == NULL)
650 return 0;
651
652 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
653 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
654 return 0;
655
656 return sm->ft_completed;
657}
658
659
b27f13ed
JM		 660static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
661 size_t gtk_elem_len)
662{
663 u8 gtk[32];
664 int keyidx;
71934751 665 enum wpa_alg alg;
b27f13ed
JM		 666 size_t gtk_len, keylen, rsc_len;
667
668 if (gtk_elem == NULL) {
669 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
670 return 0;
671 }
672
673 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
674 gtk_elem, gtk_elem_len);
675
676 if (gtk_elem_len < 10 + 24 || (gtk_elem_len - 10) % 8 ||
677 gtk_elem_len - 18 > sizeof(gtk)) {
678 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
679 "length %lu", (unsigned long) gtk_elem_len);
680 return -1;
681 }
682 gtk_len = gtk_elem_len - 18;
683 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 10, gtk)) {
684 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
685 "decrypt GTK");
686 return -1;
687 }
688
689 switch (sm->group_cipher) {
690 case WPA_CIPHER_CCMP:
691 keylen = 16;
692 rsc_len = 6;
693 alg = WPA_ALG_CCMP;
694 break;
695 case WPA_CIPHER_TKIP:
696 keylen = 32;
697 rsc_len = 6;
698 alg = WPA_ALG_TKIP;
699 break;
700 case WPA_CIPHER_WEP104:
701 keylen = 13;
702 rsc_len = 0;
703 alg = WPA_ALG_WEP;
704 break;
705 case WPA_CIPHER_WEP40:
706 keylen = 5;
707 rsc_len = 0;
708 alg = WPA_ALG_WEP;
709 break;
710 default:
711 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
712 sm->group_cipher);
713 return -1;
714 }
715
716 if (gtk_len < keylen) {
717 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
718 return -1;
719 }
720
721 /* Key Info[1] | Key Length[1] | RSC[8] | Key[5..32]. */
722
723 keyidx = gtk_elem[0] & 0x03;
724
725 if (gtk_elem[1] != keylen) {
726 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
727 "negotiated %lu",
728 gtk_elem[1], (unsigned long) keylen);
729 return -1;
730 }
731
732 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
733 if (wpa_sm_set_key(sm, alg, (u8 *) "\xff\xff\xff\xff\xff\xff",
734 keyidx, 0, gtk_elem + 2, rsc_len, gtk, keylen) <
735 0) {
736 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
737 "driver.");
738 return -1;
739 }
740
741 return 0;
742}
743
744
745#ifdef CONFIG_IEEE80211W
746static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
747 size_t igtk_elem_len)
748{
749 u8 igtk[WPA_IGTK_LEN];
750 u16 keyidx;
751
752 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
753 return 0;
754
755 if (igtk_elem == NULL) {
756 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
757 return 0;
758 }
759
760 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
761 igtk_elem, igtk_elem_len);
762
ff89afb7 763 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
b27f13ed
JM		 764 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
765 "length %lu", (unsigned long) igtk_elem_len);
766 return -1;
767 }
ff89afb7
JM		 768 if (igtk_elem[8] != WPA_IGTK_LEN) {
769 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
770 "%d", igtk_elem[8]);
771 return -1;
772 }
773
774 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
b27f13ed
JM		 775 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
776 "decrypt IGTK");
777 return -1;
778 }
779
ff89afb7 780 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
b27f13ed
JM		 781
782 keyidx = WPA_GET_LE16(igtk_elem);
783
784 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
785 WPA_IGTK_LEN);
786 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, (u8 *) "\xff\xff\xff\xff\xff\xff",
787 keyidx, 0, igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) <
788 0) {
789 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
790 "driver.");
791 return -1;
792 }
793
794 return 0;
795}
796#endif /* CONFIG_IEEE80211W */
797
798
6fc6879b 799int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
658d1662 800 size_t ies_len, const u8 *src_addr)
6fc6879b
JM		 801{
802 struct wpa_ft_ies parse;
803 struct rsn_mdie *mdie;
804 struct rsn_ftie *ftie;
b27f13ed 805 size_t count;
6fc6879b 806 u8 mic[16];
6fc6879b
JM		 807
808 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
809
810 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
811 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
812 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
813 "enabled for this connection");
814 return -1;
815 }
816
817 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
818 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
819 return -1;
820 }
821
822 mdie = (struct rsn_mdie *) parse.mdie;
823 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
824 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
825 MOBILITY_DOMAIN_ID_LEN) != 0) {
826 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
827 return -1;
828 }
829
830 ftie = (struct rsn_ftie *) parse.ftie;
831 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
832 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
833 return -1;
834 }
835
836 if (parse.r0kh_id == NULL) {
837 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
838 return -1;
839 }
840
841 if (parse.r0kh_id_len != sm->r0kh_id_len ||
842 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
843 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
844 "the current R0KH-ID");
845 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
846 parse.r0kh_id, parse.r0kh_id_len);
847 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
848 sm->r0kh_id, sm->r0kh_id_len);
849 return -1;
850 }
851
852 if (parse.r1kh_id == NULL) {
853 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
854 return -1;
855 }
856
857 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
858 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
859 "ReassocResp");
860 return -1;
861 }
862
863 if (parse.rsn_pmkid == NULL ||
864 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
865 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
866 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
867 return -1;
868 }
869
870 count = 3;
871 if (parse.tie)
872 count++;
873
658d1662 874 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
6fc6879b
JM		 875 parse.mdie - 2, parse.mdie_len + 2,
876 parse.ftie - 2, parse.ftie_len + 2,
f238cf9f
JM		 877 parse.rsn - 2, parse.rsn_len + 2,
878 parse.ric, parse.ric_len,
6fc6879b
JM		 879 mic) < 0) {
880 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
881 return -1;
882 }
883
884 if (os_memcmp(mic, ftie->mic, 16) != 0) {
885 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
886 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
887 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
888 return -1;
889 }
890
b27f13ed 891 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
6fc6879b 892 return -1;
6fc6879b 893
b27f13ed
JM		 894#ifdef CONFIG_IEEE80211W
895 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
6fc6879b 896 return -1;
b27f13ed 897#endif /* CONFIG_IEEE80211W */
6fc6879b 898
f238cf9f
JM		 899 if (parse.ric) {
900 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
901 parse.ric, parse.ric_len);
902 /* TODO: parse response and inform driver about results */
903 }
904
6fc6879b
JM		 905 return 0;
906}
907
908
909/**
910 * wpa_ft_start_over_ds - Generate over-the-DS auth request
911 * @sm: Pointer to WPA state machine data from wpa_sm_init()
912 * Returns: 0 on success, -1 on failure
913 */
914int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap)
915{
916 u8 *ft_ies;
917 size_t ft_ies_len;
918
919 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
920 MAC2STR(target_ap));
921
922 /* Generate a new SNonce */
923 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
924 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
925 return -1;
926 }
927
928 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
babfbf15 929 NULL, target_ap, NULL, 0);
6fc6879b
JM		 930 if (ft_ies) {
931 sm->over_the_ds_in_progress = 1;
932 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
933 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
934 os_free(ft_ies);
935 }
936
937 return 0;
938}
939
940#endif /* CONFIG_IEEE80211R */
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