Disconnect hostapd from building in base
[dragonfly.git] / contrib / hostapd / src / rsn_supp / wpa_ft.c
CommitLineData
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1/*
2 * WPA Supplicant - IEEE 802.11r - Fast BSS Transition
3 * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
4 *
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5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
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7 */
8
9#include "includes.h"
10
11#include "common.h"
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12#include "crypto/aes_wrap.h"
13#include "crypto/random.h"
14#include "common/ieee802_11_defs.h"
15#include "common/ieee802_11_common.h"
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16#include "wpa.h"
17#include "wpa_i.h"
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18
19#ifdef CONFIG_IEEE80211R
20
21int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
22 const struct wpa_eapol_key *key,
23 struct wpa_ptk *ptk, size_t ptk_len)
24{
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25 u8 ptk_name[WPA_PMK_NAME_LEN];
26 const u8 *anonce = key->key_nonce;
27
28 if (sm->xxkey_len == 0) {
29 wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
30 "derivation");
31 return -1;
32 }
33
34 wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
35 sm->ssid_len, sm->mobility_domain,
36 sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
37 sm->pmk_r0, sm->pmk_r0_name);
38 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN);
39 wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",
40 sm->pmk_r0_name, WPA_PMK_NAME_LEN);
41 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
4781064b 42 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
a875087d 43 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
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44 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
45 WPA_PMK_NAME_LEN);
a875087d 46 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
4781064b 47 sm->bssid, sm->pmk_r1_name,
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48 (u8 *) ptk, ptk_len, ptk_name);
49 wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len);
50 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
51
52 return 0;
53}
54
55
56/**
57 * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters
58 * @sm: Pointer to WPA state machine data from wpa_sm_init()
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59 * @ies: Association Response IEs or %NULL to clear FT parameters
60 * @ies_len: Length of ies buffer in octets
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61 * Returns: 0 on success, -1 on failure
62 */
4781064b 63int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len)
a875087d 64{
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65 struct wpa_ft_ies ft;
66
67 if (sm == NULL)
68 return 0;
69
70 if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0)
71 return -1;
72
73 if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1)
74 return -1;
75
76 if (ft.mdie) {
a875087d 77 wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
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78 ft.mdie, MOBILITY_DOMAIN_ID_LEN);
79 os_memcpy(sm->mobility_domain, ft.mdie,
a875087d 80 MOBILITY_DOMAIN_ID_LEN);
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81 sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN];
82 wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x",
83 sm->mdie_ft_capab);
84 } else
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85 os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);
86
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87 if (ft.r0kh_id) {
88 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID",
89 ft.r0kh_id, ft.r0kh_id_len);
90 os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len);
91 sm->r0kh_id_len = ft.r0kh_id_len;
92 } else {
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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
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101 if (ft.r1kh_id) {
102 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID",
103 ft.r1kh_id, FT_R1KH_ID_LEN);
104 os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN);
105 } else
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106 os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);
107
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108 os_free(sm->assoc_resp_ies);
109 sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2);
110 if (sm->assoc_resp_ies) {
111 u8 *pos = sm->assoc_resp_ies;
112 if (ft.mdie) {
113 os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2);
114 pos += ft.mdie_len + 2;
115 }
116 if (ft.ftie) {
117 os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2);
118 pos += ft.ftie_len + 2;
119 }
120 sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies;
121 wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from "
122 "(Re)Association Response",
123 sm->assoc_resp_ies, sm->assoc_resp_ies_len);
124 }
125
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126 return 0;
127}
128
129
130/**
4781064b 131 * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request
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132 * @sm: Pointer to WPA state machine data from wpa_sm_init()
133 * @len: Buffer for returning the length of the IEs
134 * @anonce: ANonce or %NULL if not yet available
135 * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List
136 * @kck: 128-bit KCK for MIC or %NULL if no MIC is used
137 * @target_ap: Target AP address
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138 * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL
139 * @ric_ies_len: Length of ric_ies buffer in octets
140 * @ap_mdie: Mobility Domain IE from the target AP
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141 * Returns: Pointer to buffer with IEs or %NULL on failure
142 *
143 * Caller is responsible for freeing the returned buffer with os_free();
144 */
145static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
146 const u8 *anonce, const u8 *pmk_name,
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147 const u8 *kck, const u8 *target_ap,
148 const u8 *ric_ies, size_t ric_ies_len,
149 const u8 *ap_mdie)
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150{
151 size_t buf_len;
152 u8 *buf, *pos, *ftie_len, *ftie_pos;
153 struct rsn_mdie *mdie;
154 struct rsn_ftie *ftie;
155 struct rsn_ie_hdr *rsnie;
156 u16 capab;
157
158 sm->ft_completed = 0;
159
160 buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
4781064b 161 2 + sm->r0kh_id_len + ric_ies_len + 100;
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162 buf = os_zalloc(buf_len);
163 if (buf == NULL)
164 return NULL;
165 pos = buf;
166
4781064b 167 /* RSNIE[PMKR0Name/PMKR1Name] */
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168 rsnie = (struct rsn_ie_hdr *) pos;
169 rsnie->elem_id = WLAN_EID_RSN;
170 WPA_PUT_LE16(rsnie->version, RSN_VERSION);
171 pos = (u8 *) (rsnie + 1);
172
173 /* Group Suite Selector */
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174 if (sm->group_cipher != WPA_CIPHER_CCMP &&
175 sm->group_cipher != WPA_CIPHER_GCMP &&
176 sm->group_cipher != WPA_CIPHER_TKIP) {
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177 wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
178 sm->group_cipher);
179 os_free(buf);
180 return NULL;
181 }
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182 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
183 sm->group_cipher));
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184 pos += RSN_SELECTOR_LEN;
185
186 /* Pairwise Suite Count */
187 WPA_PUT_LE16(pos, 1);
188 pos += 2;
189
190 /* Pairwise Suite List */
4781064b 191 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
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192 wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
193 sm->pairwise_cipher);
194 os_free(buf);
195 return NULL;
196 }
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197 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
198 sm->pairwise_cipher));
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199 pos += RSN_SELECTOR_LEN;
200
201 /* Authenticated Key Management Suite Count */
202 WPA_PUT_LE16(pos, 1);
203 pos += 2;
204
205 /* Authenticated Key Management Suite List */
206 if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X)
207 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
208 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK)
209 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
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210 else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE)
211 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
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212 else {
213 wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)",
214 sm->key_mgmt);
215 os_free(buf);
216 return NULL;
217 }
218 pos += RSN_SELECTOR_LEN;
219
220 /* RSN Capabilities */
221 capab = 0;
222#ifdef CONFIG_IEEE80211W
223 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
224 capab |= WPA_CAPABILITY_MFPC;
225#endif /* CONFIG_IEEE80211W */
226 WPA_PUT_LE16(pos, capab);
227 pos += 2;
228
229 /* PMKID Count */
230 WPA_PUT_LE16(pos, 1);
231 pos += 2;
232
233 /* PMKID List [PMKR0Name/PMKR1Name] */
234 os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN);
235 pos += WPA_PMK_NAME_LEN;
236
237#ifdef CONFIG_IEEE80211W
238 if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
239 /* Management Group Cipher Suite */
240 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
241 pos += RSN_SELECTOR_LEN;
242 }
243#endif /* CONFIG_IEEE80211W */
244
245 rsnie->len = (pos - (u8 *) rsnie) - 2;
246
247 /* MDIE */
248 *pos++ = WLAN_EID_MOBILITY_DOMAIN;
249 *pos++ = sizeof(*mdie);
250 mdie = (struct rsn_mdie *) pos;
251 pos += sizeof(*mdie);
252 os_memcpy(mdie->mobility_domain, sm->mobility_domain,
253 MOBILITY_DOMAIN_ID_LEN);
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254 mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] :
255 sm->mdie_ft_capab;
a875087d 256
4781064b 257 /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */
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258 ftie_pos = pos;
259 *pos++ = WLAN_EID_FAST_BSS_TRANSITION;
260 ftie_len = pos++;
261 ftie = (struct rsn_ftie *) pos;
262 pos += sizeof(*ftie);
263 os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN);
264 if (anonce)
265 os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN);
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266 if (kck) {
267 /* R1KH-ID sub-element in third FT message */
268 *pos++ = FTIE_SUBELEM_R1KH_ID;
269 *pos++ = FT_R1KH_ID_LEN;
270 os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN);
271 pos += FT_R1KH_ID_LEN;
272 }
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273 /* R0KH-ID sub-element */
274 *pos++ = FTIE_SUBELEM_R0KH_ID;
275 *pos++ = sm->r0kh_id_len;
276 os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len);
277 pos += sm->r0kh_id_len;
278 *ftie_len = pos - ftie_len - 1;
279
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280 if (ric_ies) {
281 /* RIC Request */
282 os_memcpy(pos, ric_ies, ric_ies_len);
283 pos += ric_ies_len;
284 }
285
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286 if (kck) {
287 /*
288 * IEEE Std 802.11r-2008, 11A.8.4
289 * MIC shall be calculated over:
290 * non-AP STA MAC address
291 * Target AP MAC address
292 * Transaction seq number (5 for ReassocReq, 3 otherwise)
293 * RSN IE
294 * MDIE
295 * FTIE (with MIC field set to 0)
296 * RIC-Request (if present)
297 */
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298 /* Information element count */
299 ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies,
300 ric_ies_len);
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301 if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5,
302 ((u8 *) mdie) - 2, 2 + sizeof(*mdie),
303 ftie_pos, 2 + *ftie_len,
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304 (u8 *) rsnie, 2 + rsnie->len, ric_ies,
305 ric_ies_len, ftie->mic) < 0) {
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306 wpa_printf(MSG_INFO, "FT: Failed to calculate MIC");
307 os_free(buf);
308 return NULL;
309 }
310 }
311
312 *len = pos - buf;
313
314 return buf;
315}
316
317
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318static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
319{
320 int keylen;
4781064b 321 enum wpa_alg alg;
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322 u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };
323
324 wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");
325
4781064b 326 if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) {
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327 wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
328 sm->pairwise_cipher);
329 return -1;
330 }
331
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332 alg = wpa_cipher_to_alg(sm->pairwise_cipher);
333 keylen = wpa_cipher_key_len(sm->pairwise_cipher);
334
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335 if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc,
336 sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) {
337 wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver");
338 return -1;
339 }
340
341 return 0;
342}
343
344
345/**
346 * wpa_ft_prepare_auth_request - Generate over-the-air auth request
347 * @sm: Pointer to WPA state machine data from wpa_sm_init()
4781064b 348 * @mdie: Target AP MDIE
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349 * Returns: 0 on success, -1 on failure
350 */
4781064b 351int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie)
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352{
353 u8 *ft_ies;
354 size_t ft_ies_len;
355
356 /* Generate a new SNonce */
4781064b 357 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
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358 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
359 return -1;
360 }
361
362 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
4781064b 363 NULL, sm->bssid, NULL, 0, mdie);
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364 if (ft_ies) {
365 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
366 ft_ies, ft_ies_len);
367 os_free(ft_ies);
368 }
369
370 return 0;
371}
372
373
374int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
4781064b
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375 int ft_action, const u8 *target_ap,
376 const u8 *ric_ies, size_t ric_ies_len)
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377{
378 u8 *ft_ies;
379 size_t ft_ies_len, ptk_len;
380 struct wpa_ft_ies parse;
381 struct rsn_mdie *mdie;
382 struct rsn_ftie *ftie;
383 u8 ptk_name[WPA_PMK_NAME_LEN];
384 int ret;
385 const u8 *bssid;
386
387 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
4781064b 388 wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len);
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389
390 if (ft_action) {
391 if (!sm->over_the_ds_in_progress) {
392 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
393 "- drop FT Action Response");
394 return -1;
395 }
396
397 if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) {
398 wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress "
399 "with this Target AP - drop FT Action "
400 "Response");
401 return -1;
402 }
403 }
404
4781064b 405 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
a875087d
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406 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
407 "enabled for this connection");
408 return -1;
409 }
410
411 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
412 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
413 return -1;
414 }
415
416 mdie = (struct rsn_mdie *) parse.mdie;
417 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
418 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
419 MOBILITY_DOMAIN_ID_LEN) != 0) {
420 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
421 return -1;
422 }
423
424 ftie = (struct rsn_ftie *) parse.ftie;
425 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
426 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
427 return -1;
428 }
429
4781064b
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430 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
431 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
432 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
433 ftie->snonce, WPA_NONCE_LEN);
434 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
435 sm->snonce, WPA_NONCE_LEN);
436 return -1;
437 }
438
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439 if (parse.r0kh_id == NULL) {
440 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
441 return -1;
442 }
443
444 if (parse.r0kh_id_len != sm->r0kh_id_len ||
445 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
446 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
447 "the current R0KH-ID");
448 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
449 parse.r0kh_id, parse.r0kh_id_len);
450 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
451 sm->r0kh_id, sm->r0kh_id_len);
452 return -1;
453 }
454
455 if (parse.r1kh_id == NULL) {
456 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
457 return -1;
458 }
459
460 if (parse.rsn_pmkid == NULL ||
461 os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) {
462 wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in "
463 "RSNIE");
464 return -1;
465 }
466
467 os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN);
468 wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN);
469 wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN);
470 wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN);
4781064b 471 os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN);
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472 wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id,
473 sm->own_addr, sm->pmk_r1, sm->pmk_r1_name);
474 wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
475 wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name",
476 sm->pmk_r1_name, WPA_PMK_NAME_LEN);
477
478 bssid = target_ap;
4781064b 479 ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64;
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480 wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr,
481 bssid, sm->pmk_r1_name,
482 (u8 *) &sm->ptk, ptk_len, ptk_name);
483 wpa_hexdump_key(MSG_DEBUG, "FT: PTK",
484 (u8 *) &sm->ptk, ptk_len);
485 wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN);
486
487 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce,
4781064b
JM
488 sm->pmk_r1_name, sm->ptk.kck, bssid,
489 ric_ies, ric_ies_len,
490 parse.mdie ? parse.mdie - 2 : NULL);
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491 if (ft_ies) {
492 wpa_sm_update_ft_ies(sm, sm->mobility_domain,
493 ft_ies, ft_ies_len);
494 os_free(ft_ies);
495 }
496
4781064b 497 wpa_sm_mark_authenticated(sm, bssid);
a875087d 498 ret = wpa_ft_install_ptk(sm, bssid);
4781064b
JM
499 if (ret) {
500 /*
501 * Some drivers do not support key configuration when we are
502 * not associated with the target AP. Work around this by
503 * trying again after the following reassociation gets
504 * completed.
505 */
506 wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to "
507 "association - try again after reassociation");
508 sm->set_ptk_after_assoc = 1;
509 } else
510 sm->set_ptk_after_assoc = 0;
a875087d 511
4781064b
JM
512 sm->ft_completed = 1;
513 if (ft_action) {
514 /*
515 * The caller is expected trigger re-association with the
516 * Target AP.
517 */
518 os_memcpy(sm->bssid, target_ap, ETH_ALEN);
a875087d
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519 }
520
4781064b 521 return 0;
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522}
523
524
525int wpa_ft_is_completed(struct wpa_sm *sm)
526{
527 if (sm == NULL)
528 return 0;
529
4781064b 530 if (!wpa_key_mgmt_ft(sm->key_mgmt))
a875087d
JL
531 return 0;
532
533 return sm->ft_completed;
534}
535
536
4781064b
JM
537void wpa_reset_ft_completed(struct wpa_sm *sm)
538{
539 if (sm != NULL)
540 sm->ft_completed = 0;
541}
542
543
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JL
544static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem,
545 size_t gtk_elem_len)
546{
547 u8 gtk[32];
548 int keyidx;
4781064b 549 enum wpa_alg alg;
a875087d
JL
550 size_t gtk_len, keylen, rsc_len;
551
552 if (gtk_elem == NULL) {
553 wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE");
554 return 0;
555 }
556
557 wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp",
558 gtk_elem, gtk_elem_len);
559
4781064b
JM
560 if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 ||
561 gtk_elem_len - 19 > sizeof(gtk)) {
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562 wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem "
563 "length %lu", (unsigned long) gtk_elem_len);
564 return -1;
565 }
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JM
566 gtk_len = gtk_elem_len - 19;
567 if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) {
a875087d
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568 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
569 "decrypt GTK");
570 return -1;
571 }
572
4781064b
JM
573 keylen = wpa_cipher_key_len(sm->group_cipher);
574 rsc_len = wpa_cipher_rsc_len(sm->group_cipher);
575 alg = wpa_cipher_to_alg(sm->group_cipher);
576 if (alg == WPA_ALG_NONE) {
a875087d
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577 wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d",
578 sm->group_cipher);
579 return -1;
580 }
581
582 if (gtk_len < keylen) {
583 wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE");
584 return -1;
585 }
586
4781064b 587 /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */
a875087d 588
4781064b 589 keyidx = WPA_GET_LE16(gtk_elem) & 0x03;
a875087d 590
4781064b 591 if (gtk_elem[2] != keylen) {
a875087d
JL
592 wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
593 "negotiated %lu",
4781064b 594 gtk_elem[2], (unsigned long) keylen);
a875087d
JL
595 return -1;
596 }
597
598 wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
4781064b
JM
599 if (sm->group_cipher == WPA_CIPHER_TKIP) {
600 /* Swap Tx/Rx keys for Michael MIC */
601 u8 tmp[8];
602 os_memcpy(tmp, gtk + 16, 8);
603 os_memcpy(gtk + 16, gtk + 24, 8);
604 os_memcpy(gtk + 24, tmp, 8);
605 }
606 if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0,
607 gtk_elem + 3, rsc_len, gtk, keylen) < 0) {
a875087d
JL
608 wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the "
609 "driver.");
610 return -1;
611 }
612
613 return 0;
614}
615
616
617#ifdef CONFIG_IEEE80211W
618static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem,
619 size_t igtk_elem_len)
620{
621 u8 igtk[WPA_IGTK_LEN];
622 u16 keyidx;
623
624 if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC)
625 return 0;
626
627 if (igtk_elem == NULL) {
628 wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE");
629 return 0;
630 }
631
632 wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp",
633 igtk_elem, igtk_elem_len);
634
635 if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) {
636 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem "
637 "length %lu", (unsigned long) igtk_elem_len);
638 return -1;
639 }
640 if (igtk_elem[8] != WPA_IGTK_LEN) {
641 wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length "
642 "%d", igtk_elem[8]);
643 return -1;
644 }
645
646 if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) {
647 wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
648 "decrypt IGTK");
649 return -1;
650 }
651
652 /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */
653
654 keyidx = WPA_GET_LE16(igtk_elem);
655
656 wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk,
657 WPA_IGTK_LEN);
4781064b
JM
658 if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0,
659 igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) {
a875087d
JL
660 wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the "
661 "driver.");
662 return -1;
663 }
664
665 return 0;
666}
667#endif /* CONFIG_IEEE80211W */
668
669
670int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
671 size_t ies_len, const u8 *src_addr)
672{
673 struct wpa_ft_ies parse;
674 struct rsn_mdie *mdie;
675 struct rsn_ftie *ftie;
4781064b 676 unsigned int count;
a875087d
JL
677 u8 mic[16];
678
679 wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len);
680
4781064b 681 if (!wpa_key_mgmt_ft(sm->key_mgmt)) {
a875087d
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682 wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not "
683 "enabled for this connection");
684 return -1;
685 }
686
687 if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
688 wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
689 return -1;
690 }
691
692 mdie = (struct rsn_mdie *) parse.mdie;
693 if (mdie == NULL || parse.mdie_len < sizeof(*mdie) ||
694 os_memcmp(mdie->mobility_domain, sm->mobility_domain,
695 MOBILITY_DOMAIN_ID_LEN) != 0) {
696 wpa_printf(MSG_DEBUG, "FT: Invalid MDIE");
697 return -1;
698 }
699
700 ftie = (struct rsn_ftie *) parse.ftie;
701 if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
702 wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
703 return -1;
704 }
705
4781064b
JM
706 if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) {
707 wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
708 wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
709 ftie->snonce, WPA_NONCE_LEN);
710 wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
711 sm->snonce, WPA_NONCE_LEN);
712 return -1;
713 }
714
715 if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) {
716 wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
717 wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
718 ftie->anonce, WPA_NONCE_LEN);
719 wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
720 sm->anonce, WPA_NONCE_LEN);
721 return -1;
722 }
723
a875087d
JL
724 if (parse.r0kh_id == NULL) {
725 wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
726 return -1;
727 }
728
729 if (parse.r0kh_id_len != sm->r0kh_id_len ||
730 os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) {
731 wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with "
732 "the current R0KH-ID");
733 wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE",
734 parse.r0kh_id, parse.r0kh_id_len);
735 wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID",
736 sm->r0kh_id, sm->r0kh_id_len);
737 return -1;
738 }
739
740 if (parse.r1kh_id == NULL) {
741 wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE");
742 return -1;
743 }
744
745 if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) {
746 wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in "
747 "ReassocResp");
748 return -1;
749 }
750
751 if (parse.rsn_pmkid == NULL ||
752 os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) {
753 wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in "
754 "RSNIE (pmkid=%d)", !!parse.rsn_pmkid);
755 return -1;
756 }
757
758 count = 3;
4781064b
JM
759 if (parse.ric)
760 count += ieee802_11_ie_count(parse.ric, parse.ric_len);
a875087d 761 if (ftie->mic_control[1] != count) {
4781064b
JM
762 wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
763 "Control: received %u expected %u",
764 ftie->mic_control[1], count);
a875087d
JL
765 return -1;
766 }
767
768 if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6,
769 parse.mdie - 2, parse.mdie_len + 2,
770 parse.ftie - 2, parse.ftie_len + 2,
4781064b
JM
771 parse.rsn - 2, parse.rsn_len + 2,
772 parse.ric, parse.ric_len,
a875087d
JL
773 mic) < 0) {
774 wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC");
775 return -1;
776 }
777
778 if (os_memcmp(mic, ftie->mic, 16) != 0) {
779 wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
780 wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16);
781 wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16);
782 return -1;
783 }
784
785 if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
786 return -1;
787
788#ifdef CONFIG_IEEE80211W
789 if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0)
790 return -1;
791#endif /* CONFIG_IEEE80211W */
792
4781064b
JM
793 if (sm->set_ptk_after_assoc) {
794 wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we "
795 "are associated");
796 if (wpa_ft_install_ptk(sm, src_addr) < 0)
797 return -1;
798 sm->set_ptk_after_assoc = 0;
799 }
800
801 if (parse.ric) {
802 wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
803 parse.ric, parse.ric_len);
804 /* TODO: parse response and inform driver about results when
805 * using wpa_supplicant SME */
806 }
807
808 wpa_printf(MSG_DEBUG, "FT: Completed successfully");
809
a875087d
JL
810 return 0;
811}
812
813
814/**
815 * wpa_ft_start_over_ds - Generate over-the-DS auth request
816 * @sm: Pointer to WPA state machine data from wpa_sm_init()
4781064b
JM
817 * @target_ap: Target AP Address
818 * @mdie: Mobility Domain IE from the target AP
a875087d
JL
819 * Returns: 0 on success, -1 on failure
820 */
4781064b
JM
821int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap,
822 const u8 *mdie)
a875087d
JL
823{
824 u8 *ft_ies;
825 size_t ft_ies_len;
826
827 wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR,
828 MAC2STR(target_ap));
829
830 /* Generate a new SNonce */
4781064b 831 if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) {
a875087d
JL
832 wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce");
833 return -1;
834 }
835
836 ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name,
4781064b 837 NULL, target_ap, NULL, 0, mdie);
a875087d
JL
838 if (ft_ies) {
839 sm->over_the_ds_in_progress = 1;
840 os_memcpy(sm->target_ap, target_ap, ETH_ALEN);
841 wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len);
842 os_free(ft_ies);
843 }
844
845 return 0;
846}
847
848#endif /* CONFIG_IEEE80211R */