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FT: Deauthenticate in case of Reassoc Response validation error
[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 30{
6fc6879b
JM		 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,
26e23750 48 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
6fc6879b 49 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
26e23750
JM		 50 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
51 WPA_PMK_NAME_LEN);
6fc6879b 52 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
26e23750 53 sm->bssid, sm->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()
f4ec630d 65 * @mobility_domain: Mobility domain identifier (2 octets + 1 octet)
6fc6879b
JM		 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);
f4ec630d
JM		 80 sm->mdie_ft_capab = mobility_domain[MOBILITY_DOMAIN_ID_LEN];
81 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
82 sm->mdie_ft_capab);
6fc6879b
JM		 83 } else if (sm)
84 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
85
86 if (sm && r0kh_id) {
87 if (r0kh_id_len > FT_R0KH_ID_MAX_LEN)
88 return -1;
89 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", r0kh_id, r0kh_id_len);
90 os_memcpy(sm->r0kh_id, r0kh_id, r0kh_id_len);
91 sm->r0kh_id_len = r0kh_id_len;
92 } else if (sm) {
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 if (sm && r1kh_id) {
102 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", r1kh_id, FT_R1KH_ID_LEN);
103 os_memcpy(sm->r1kh_id, r1kh_id, FT_R1KH_ID_LEN);
104 } else if (sm)
105 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
106
107 return 0;
108}
109
110
111/**
babfbf15 112 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
6fc6879b
JM		 113 * @sm: Pointer to WPA state machine data from wpa_sm_init()
114 * @len: Buffer for returning the length of the IEs
115 * @anonce: ANonce or %NULL if not yet available
116 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
117 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
118 * @target_ap: Target AP address
babfbf15
JM		 119 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
120 * @ric_ies_len: Length of ric_ies buffer in octets
76b7981d 121 * @ap_mdie: Mobility Domain IE from the target AP
6fc6879b
JM		 122 * Returns: Pointer to buffer with IEs or %NULL on failure
123 *
124 * Caller is responsible for freeing the returned buffer with os_free();
125 */
126static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
127 const u8 *anonce, const u8 *pmk_name,
babfbf15 128 const u8 *kck, const u8 *target_ap,
76b7981d
JM		 129 const u8 *ric_ies, size_t ric_ies_len,
130 const u8 *ap_mdie)
6fc6879b
JM		 131{
132 size_t buf_len;
ccfab35a 133 u8 *buf, *pos, *ftie_len, *ftie_pos;
6fc6879b
JM		 134 struct rsn_mdie *mdie;
135 struct rsn_ftie *ftie;
136 struct rsn_ie_hdr *rsnie;
137 u16 capab;
138
139 sm->ft_completed = 0;
140
141 buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
babfbf15 142 2 + sm->r0kh_id_len + ric_ies_len + 100;
6fc6879b
JM		 143 buf = os_zalloc(buf_len);
144 if (buf == NULL)
145 return NULL;
146 pos = buf;
147
babfbf15 148 /* RSNIE[PMKR0Name/PMKR1Name] */
6fc6879b
JM		 149 rsnie = (struct rsn_ie_hdr *) pos;
150 rsnie->elem_id = WLAN_EID_RSN;
151 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
152 pos = (u8 *) (rsnie + 1);
153
154 /* Group Suite Selector */
155 if (sm->group_cipher == WPA_CIPHER_CCMP)
156 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
157 else if (sm->group_cipher == WPA_CIPHER_TKIP)
158 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
159 else {
160 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
161 sm->group_cipher);
162 os_free(buf);
163 return NULL;
164 }
165 pos += RSN_SELECTOR_LEN;
166
167 /* Pairwise Suite Count */
168 WPA_PUT_LE16(pos, 1);
169 pos += 2;
170
171 /* Pairwise Suite List */
172 if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
173 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
174 else if (sm->pairwise_cipher == WPA_CIPHER_TKIP)
175 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
176 else {
177 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
178 sm->pairwise_cipher);
179 os_free(buf);
180 return NULL;
181 }
182 pos += RSN_SELECTOR_LEN;
183
184 /* Authenticated Key Management Suite Count */
185 WPA_PUT_LE16(pos, 1);
186 pos += 2;
187
188 /* Authenticated Key Management Suite List */
189 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
190 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
191 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
192 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
193 else {
194 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
195 sm->key_mgmt);
196 os_free(buf);
197 return NULL;
198 }
199 pos += RSN_SELECTOR_LEN;
200
201 /* RSN Capabilities */
202 capab = 0;
203#ifdef CONFIG_IEEE80211W
204 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
0b60b0aa 205 capab |= WPA_CAPABILITY_MFPC;
6fc6879b
JM		 206#endif /* CONFIG_IEEE80211W */
207 WPA_PUT_LE16(pos, capab);
208 pos += 2;
209
210 /* PMKID Count */
211 WPA_PUT_LE16(pos, 1);
212 pos += 2;
213
214 /* PMKID List [PMKR0Name/PMKR1Name] */
215 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
216 pos += WPA_PMK_NAME_LEN;
217
218#ifdef CONFIG_IEEE80211W
219 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
220 /* Management Group Cipher Suite */
221 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
222 pos += RSN_SELECTOR_LEN;
223 }
224#endif /* CONFIG_IEEE80211W */
225
226 rsnie->len = (pos - (u8 *) rsnie) - 2;
227
228 /* MDIE */
229 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
230 *pos++ = sizeof(*mdie);
231 mdie = (struct rsn_mdie *) pos;
232 pos += sizeof(*mdie);
233 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
234 MOBILITY_DOMAIN_ID_LEN);
f4ec630d
JM		 235 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
236 sm->mdie_ft_capab;
6fc6879b 237
3db65314 238 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
ccfab35a 239 ftie_pos = pos;
6fc6879b
JM		 240 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
241 ftie_len = pos++;
242 ftie = (struct rsn_ftie *) pos;
243 pos += sizeof(*ftie);
244 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
245 if (anonce)
246 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
3db65314
JM		 247 if (kck) {
248 /* R1KH-ID sub-element in third FT message */
249 *pos++ = FTIE_SUBELEM_R1KH_ID;
250 *pos++ = FT_R1KH_ID_LEN;
251 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
252 pos += FT_R1KH_ID_LEN;
253 }
6fc6879b
JM		 254 /* R0KH-ID sub-element */
255 *pos++ = FTIE_SUBELEM_R0KH_ID;
256 *pos++ = sm->r0kh_id_len;
257 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
258 pos += sm->r0kh_id_len;
259 *ftie_len = pos - ftie_len - 1;
260
babfbf15
JM		 261 if (ric_ies) {
262 /* RIC Request */
263 os_memcpy(pos, ric_ies, ric_ies_len);
264 pos += ric_ies_len;
265 }
266
6fc6879b
JM		 267 if (kck) {
268 /*
c1e033b0 269 * IEEE Std 802.11r-2008, 11A.8.4
6fc6879b
JM		 270 * MIC shall be calculated over:
271 * non-AP STA MAC address
272 * Target AP MAC address
273 * Transaction seq number (5 for ReassocReq, 3 otherwise)
274 * RSN IE
275 * MDIE
276 * FTIE (with MIC field set to 0)
277 * RIC-Request (if present)
278 */
babfbf15
JM		 279 /* Information element count */
280 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
281 ric_ies_len);
6fc6879b
JM		 282 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
283 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
ccfab35a 284 ftie_pos, 2 + *ftie_len,
babfbf15
JM		 285 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
286 ric_ies_len, ftie->mic) < 0) {
6fc6879b
JM		 287 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
288 os_free(buf);
289 return NULL;
290 }
291 }
292
293 *len = pos - buf;
294
295 return buf;
296}
297
298
299struct wpa_ft_ies {
300 const u8 *mdie;
301 size_t mdie_len;
302 const u8 *ftie;
303 size_t ftie_len;
304 const u8 *r1kh_id;
305 const u8 *gtk;
306 size_t gtk_len;
307 const u8 *r0kh_id;
308 size_t r0kh_id_len;
309 const u8 *rsn;
310 size_t rsn_len;
311 const u8 *rsn_pmkid;
312 const u8 *tie;
313 size_t tie_len;
b27f13ed
JM		 314 const u8 *igtk;
315 size_t igtk_len;
f238cf9f
JM		 316 const u8 *ric;
317 size_t ric_len;
6fc6879b
JM		 318};
319
320
321static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
322 struct wpa_ft_ies *parse)
323{
324 const u8 *end, *pos;
325
326 parse->ftie = ie;
327 parse->ftie_len = ie_len;
328
329 pos = ie + sizeof(struct rsn_ftie);
330 end = ie + ie_len;
331
332 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
333 switch (pos[0]) {
334 case FTIE_SUBELEM_R1KH_ID:
335 if (pos[1] != FT_R1KH_ID_LEN) {
336 wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
337 "length in FTIE: %d", pos[1]);
338 return -1;
339 }
340 parse->r1kh_id = pos + 2;
341 break;
342 case FTIE_SUBELEM_GTK:
343 parse->gtk = pos + 2;
344 parse->gtk_len = pos[1];
345 break;
346 case FTIE_SUBELEM_R0KH_ID:
347 if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
348 wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
349 "length in FTIE: %d", pos[1]);
350 return -1;
351 }
352 parse->r0kh_id = pos + 2;
353 parse->r0kh_id_len = pos[1];
354 break;
b27f13ed
JM		 355#ifdef CONFIG_IEEE80211W
356 case FTIE_SUBELEM_IGTK:
357 parse->igtk = pos + 2;
358 parse->igtk_len = pos[1];
359 break;
360#endif /* CONFIG_IEEE80211W */
6fc6879b
JM		 361 }
362
363 pos += 2 + pos[1];
364 }
365
366 return 0;
367}
368
369
370static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
371 struct wpa_ft_ies *parse)
372{
373 const u8 *end, *pos;
374 struct wpa_ie_data data;
375 int ret;
f238cf9f
JM		 376 const struct rsn_ftie *ftie;
377 int prot_ie_count = 0;
6fc6879b
JM		 378
379 os_memset(parse, 0, sizeof(*parse));
380 if (ies == NULL)
381 return 0;
382
383 pos = ies;
384 end = ies + ies_len;
385 while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
386 switch (pos[0]) {
387 case WLAN_EID_RSN:
388 parse->rsn = pos + 2;
389 parse->rsn_len = pos[1];
390 ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
391 parse->rsn_len + 2,
392 &data);
393 if (ret < 0) {
394 wpa_printf(MSG_DEBUG, "FT: Failed to parse "
395 "RSN IE: %d", ret);
396 return -1;
397 }
398 if (data.num_pmkid == 1 && data.pmkid)
399 parse->rsn_pmkid = data.pmkid;
400 break;
401 case WLAN_EID_MOBILITY_DOMAIN:
402 parse->mdie = pos + 2;
403 parse->mdie_len = pos[1];
404 break;
405 case WLAN_EID_FAST_BSS_TRANSITION:
f238cf9f
JM		 406 if (pos[1] < sizeof(*ftie))
407 return -1;
408 ftie = (const struct rsn_ftie *) (pos + 2);
409 prot_ie_count = ftie->mic_control[1];
6fc6879b
JM		 410 if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
411 return -1;
412 break;
413 case WLAN_EID_TIMEOUT_INTERVAL:
414 parse->tie = pos + 2;
415 parse->tie_len = pos[1];
416 break;
f238cf9f
JM		 417 case WLAN_EID_RIC_DATA:
418 if (parse->ric == NULL)
419 parse->ric = pos;
6fc6879b
JM		 420 }
421
422 pos += 2 + pos[1];
423 }
424
f238cf9f
JM		 425 if (prot_ie_count == 0)
426 return 0; /* no MIC */
427
428 /*
429 * Check that the protected IE count matches with IEs included in the
430 * frame.
431 */
432 if (parse->rsn)
433 prot_ie_count--;
434 if (parse->mdie)
435 prot_ie_count--;
436 if (parse->ftie)
437 prot_ie_count--;
438 if (parse->tie)
439 prot_ie_count--;
440 if (prot_ie_count < 0) {
441 wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in "
442 "the protected IE count");
443 return -1;
444 }
445
446 if (prot_ie_count == 0 && parse->ric) {
447 wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not "
448 "included in protected IE count");
449 return -1;
450 }
451
452 /* Determine the end of the RIC IE(s) */
453 pos = parse->ric;
454 while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end &&
455 prot_ie_count) {
456 prot_ie_count--;
457 pos += 2 + pos[1];
458 }
459 parse->ric_len = pos - parse->ric;
460 if (prot_ie_count) {
461 wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from "
462 "frame", (int) prot_ie_count);
463 return -1;
464 }
465
6fc6879b
JM		 466 return 0;
467}
468
469
470static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
471{
472 int keylen;
71934751 473 enum wpa_alg alg;
6fc6879b
JM		 474 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
475
476 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
477
478 switch (sm->pairwise_cipher) {
479 case WPA_CIPHER_CCMP:
480 alg = WPA_ALG_CCMP;
481 keylen = 16;
482 break;
483 case WPA_CIPHER_TKIP:
484 alg = WPA_ALG_TKIP;
485 keylen = 32;
486 break;
487 default:
488 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
489 sm->pairwise_cipher);
490 return -1;
491 }
492
493 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
494 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
495 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
496 return -1;
497 }
498
499 return 0;
500}
501
502
503/**
504 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
505 * @sm: Pointer to WPA state machine data from wpa_sm_init()
76b7981d 506 * @mdie: Target AP MDIE
6fc6879b
JM		 507 * Returns: 0 on success, -1 on failure
508 */
76b7981d 509int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
6fc6879b
JM		 510{
511 u8 *ft_ies;
512 size_t ft_ies_len;
513
514 /* Generate a new SNonce */
515 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
516 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
517 return -1;
518 }
519
520 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
76b7981d 521 NULL, sm->bssid, NULL, 0, mdie);
6fc6879b
JM		 522 if (ft_ies) {
523 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
524 ft_ies, ft_ies_len);
525 os_free(ft_ies);
526 }
527
528 return 0;
529}
530
531
532int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
babfbf15
JM		 533 int ft_action, const u8 *target_ap,
534 const u8 *ric_ies, size_t ric_ies_len)
6fc6879b
JM		 535{
536 u8 *ft_ies;
c0a61908 537 size_t ft_ies_len, ptk_len;
6fc6879b
JM		 538 struct wpa_ft_ies parse;
539 struct rsn_mdie *mdie;
540 struct rsn_ftie *ftie;
541 u8 ptk_name[WPA_PMK_NAME_LEN];
542 int ret;
543 const u8 *bssid;
544
545 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
babfbf15 546 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
6fc6879b
JM		 547
548 if (ft_action) {
549 if (!sm->over_the_ds_in_progress) {
550 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
551 "- drop FT Action Response");
552 return -1;
553 }
554
555 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
556 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
557 "with this Target AP - drop FT Action "
558 "Response");
559 return -1;
560 }
561 }
562
563 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
564 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
565 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
566 "enabled for this connection");
567 return -1;
568 }
569
570 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
571 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
572 return -1;
573 }
574
575 mdie = (struct rsn_mdie *) parse.mdie;
576 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
577 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
578 MOBILITY_DOMAIN_ID_LEN) != 0) {
579 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
580 return -1;
581 }
582
583 ftie = (struct rsn_ftie *) parse.ftie;
584 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
585 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
586 return -1;
587 }
588
589 if (parse.r0kh_id == NULL) {
590 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
591 return -1;
592 }
593
594 if (parse.r0kh_id_len != sm->r0kh_id_len ||
595 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
596 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
597 "the current R0KH-ID");
598 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
599 parse.r0kh_id, parse.r0kh_id_len);
600 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
601 sm->r0kh_id, sm->r0kh_id_len);
602 return -1;
603 }
604
605 if (parse.r1kh_id == NULL) {
606 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
607 return -1;
608 }
609
610 if (parse.rsn_pmkid == NULL ||
611 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
612 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
613 "RSNIE");
614 return -1;
615 }
616
617 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
618 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
619 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
620 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
621 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
622 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
623 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
624 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
625 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
626
658d1662 627 bssid = target_ap;
c0a61908 628 ptk_len = sm->pairwise_cipher == WPA_CIPHER_CCMP ? 48 : 64;
6fc6879b
JM		 629 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
630 bssid, sm->pmk_r1_name,
c0a61908 631 (u8 *) &sm->ptk, ptk_len, ptk_name);
6fc6879b 632 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
c0a61908 633 (u8 *) &sm->ptk, ptk_len);
6fc6879b
JM		 634 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
635
636 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
babfbf15 637 sm->pmk_r1_name, sm->ptk.kck, bssid,
76b7981d
JM		 638 ric_ies, ric_ies_len,
639 parse.mdie ? parse.mdie - 2 : NULL);
6fc6879b
JM		 640 if (ft_ies) {
641 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
642 ft_ies, ft_ies_len);
643 os_free(ft_ies);
644 }
645
2a7e7f4e 646 wpa_sm_mark_authenticated(sm, bssid);
6fc6879b 647 ret = wpa_ft_install_ptk(sm, bssid);
86f7b62a
JM		 648 if (ret) {
649 /*
650 * Some drivers do not support key configuration when we are
651 * not associated with the target AP. Work around this by
652 * trying again after the following reassociation gets
653 * completed.
654 */
655 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
656 "association - try again after reassociation");
657 sm->set_ptk_after_assoc = 1;
658 } else
659 sm->set_ptk_after_assoc = 0;
6fc6879b 660
86f7b62a
JM		 661 sm->ft_completed = 1;
662 if (ft_action) {
663 /*
664 * The caller is expected trigger re-association with the
665 * Target AP.
666 */
667 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
6fc6879b
JM		 668 }
669
86f7b62a 670 return 0;
6fc6879b
JM		 671}
672
673
674int wpa_ft_is_completed(struct wpa_sm *sm)
675{
676 if (sm == NULL)
677 return 0;
678
679 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
680 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK)
681 return 0;
682
683 return sm->ft_completed;
684}
685
686
b27f13ed
JM		 687static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
688 size_t gtk_elem_len)
689{
690 u8 gtk[32];
691 int keyidx;
71934751 692 enum wpa_alg alg;
b27f13ed
JM		 693 size_t gtk_len, keylen, rsc_len;
694
695 if (gtk_elem == NULL) {
696 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
697 return 0;
698 }
699
700 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
701 gtk_elem, gtk_elem_len);
702
39eb4d08
JM		 703 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
704 gtk_elem_len - 19 > sizeof(gtk)) {
b27f13ed
JM		 705 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
706 "length %lu", (unsigned long) gtk_elem_len);
707 return -1;
708 }
39eb4d08
JM		 709 gtk_len = gtk_elem_len - 19;
710 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
b27f13ed
JM		 711 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
712 "decrypt GTK");
713 return -1;
714 }
715
716 switch (sm->group_cipher) {
717 case WPA_CIPHER_CCMP:
718 keylen = 16;
719 rsc_len = 6;
720 alg = WPA_ALG_CCMP;
721 break;
722 case WPA_CIPHER_TKIP:
723 keylen = 32;
724 rsc_len = 6;
725 alg = WPA_ALG_TKIP;
726 break;
727 case WPA_CIPHER_WEP104:
728 keylen = 13;
729 rsc_len = 0;
730 alg = WPA_ALG_WEP;
731 break;
732 case WPA_CIPHER_WEP40:
733 keylen = 5;
734 rsc_len = 0;
735 alg = WPA_ALG_WEP;
736 break;
737 default:
738 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
739 sm->group_cipher);
740 return -1;
741 }
742
743 if (gtk_len < keylen) {
744 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
745 return -1;
746 }
747
39eb4d08 748 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
b27f13ed 749
39eb4d08 750 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
b27f13ed 751
39eb4d08 752 if (gtk_elem[2] != keylen) {
b27f13ed
JM		 753 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
754 "negotiated %lu",
39eb4d08 755 gtk_elem[2], (unsigned long) keylen);
b27f13ed
JM		 756 return -1;
757 }
758
759 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
760 if (wpa_sm_set_key(sm, alg, (u8 *) "\xff\xff\xff\xff\xff\xff",
39eb4d08 761 keyidx, 0, gtk_elem + 3, rsc_len, gtk, keylen) <
b27f13ed
JM		 762 0) {
763 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
764 "driver.");
765 return -1;
766 }
767
768 return 0;
769}
770
771
772#ifdef CONFIG_IEEE80211W
773static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
774 size_t igtk_elem_len)
775{
776 u8 igtk[WPA_IGTK_LEN];
777 u16 keyidx;
778
779 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
780 return 0;
781
782 if (igtk_elem == NULL) {
783 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
784 return 0;
785 }
786
787 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
788 igtk_elem, igtk_elem_len);
789
ff89afb7 790 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
b27f13ed
JM		 791 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
792 "length %lu", (unsigned long) igtk_elem_len);
793 return -1;
794 }
ff89afb7
JM		 795 if (igtk_elem[8] != WPA_IGTK_LEN) {
796 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
797 "%d", igtk_elem[8]);
798 return -1;
799 }
800
801 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
b27f13ed
JM		 802 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
803 "decrypt IGTK");
804 return -1;
805 }
806
ff89afb7 807 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
b27f13ed
JM		 808
809 keyidx = WPA_GET_LE16(igtk_elem);
810
811 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
812 WPA_IGTK_LEN);
813 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, (u8 *) "\xff\xff\xff\xff\xff\xff",
814 keyidx, 0, igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) <
815 0) {
816 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
817 "driver.");
818 return -1;
819 }
820
821 return 0;
822}
823#endif /* CONFIG_IEEE80211W */
824
825
6fc6879b 826int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
658d1662 827 size_t ies_len, const u8 *src_addr)
6fc6879b
JM		 828{
829 struct wpa_ft_ies parse;
830 struct rsn_mdie *mdie;
831 struct rsn_ftie *ftie;
b27f13ed 832 size_t count;
6fc6879b 833 u8 mic[16];
6fc6879b
JM		 834
835 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
836
837 if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X &&
838 sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) {
839 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
840 "enabled for this connection");
841 return -1;
842 }
843
844 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
845 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
846 return -1;
847 }
848
849 mdie = (struct rsn_mdie *) parse.mdie;
850 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
851 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
852 MOBILITY_DOMAIN_ID_LEN) != 0) {
853 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
854 return -1;
855 }
856
857 ftie = (struct rsn_ftie *) parse.ftie;
858 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
859 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
860 return -1;
861 }
862
863 if (parse.r0kh_id == NULL) {
864 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
865 return -1;
866 }
867
868 if (parse.r0kh_id_len != sm->r0kh_id_len ||
869 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
870 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
871 "the current R0KH-ID");
872 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
873 parse.r0kh_id, parse.r0kh_id_len);
874 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
875 sm->r0kh_id, sm->r0kh_id_len);
876 return -1;
877 }
878
879 if (parse.r1kh_id == NULL) {
880 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
881 return -1;
882 }
883
884 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
885 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
886 "ReassocResp");
887 return -1;
888 }
889
890 if (parse.rsn_pmkid == NULL ||
891 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
892 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
893 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
894 return -1;
895 }
896
897 count = 3;
898 if (parse.tie)
899 count++;
900
658d1662 901 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
6fc6879b
JM		 902 parse.mdie - 2, parse.mdie_len + 2,
903 parse.ftie - 2, parse.ftie_len + 2,
f238cf9f
JM		 904 parse.rsn - 2, parse.rsn_len + 2,
905 parse.ric, parse.ric_len,
6fc6879b
JM		 906 mic) < 0) {
907 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
908 return -1;
909 }
910
911 if (os_memcmp(mic, ftie->mic, 16) != 0) {
912 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
913 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
914 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
915 return -1;
916 }
917
b27f13ed 918 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
6fc6879b 919 return -1;
6fc6879b 920
b27f13ed
JM		 921#ifdef CONFIG_IEEE80211W
922 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
6fc6879b 923 return -1;
b27f13ed 924#endif /* CONFIG_IEEE80211W */
6fc6879b 925
86f7b62a
JM		 926 if (sm->set_ptk_after_assoc) {
927 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
928 "are associated");
929 if (wpa_ft_install_ptk(sm, src_addr) < 0)
930 return -1;
931 sm->set_ptk_after_assoc = 0;
932 }
933
f238cf9f
JM		 934 if (parse.ric) {
935 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
936 parse.ric, parse.ric_len);
937 /* TODO: parse response and inform driver about results */
938 }
939
6fc6879b
JM		 940 return 0;
941}
942
943
944/**
945 * wpa_ft_start_over_ds - Generate over-the-DS auth request
946 * @sm: Pointer to WPA state machine data from wpa_sm_init()
76b7981d
JM		 947 * @target_ap: Target AP Address
948 * @mdie: Mobility Domain IE from the target AP
6fc6879b
JM		 949 * Returns: 0 on success, -1 on failure
950 */
76b7981d
JM		 951int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
952 const u8 *mdie)
6fc6879b
JM		 953{
954 u8 *ft_ies;
955 size_t ft_ies_len;
956
957 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
958 MAC2STR(target_ap));
959
960 /* Generate a new SNonce */
961 if (os_get_random(sm->snonce, WPA_NONCE_LEN)) {
962 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
963 return -1;
964 }
965
966 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
76b7981d 967 NULL, target_ap, NULL, 0, mdie);
6fc6879b
JM		 968 if (ft_ies) {
969 sm->over_the_ds_in_progress = 1;
970 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
971 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
972 os_free(ft_ies);
973 }
974
975 return 0;
976}
977
978#endif /* CONFIG_IEEE80211R */
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