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Commit | Line | Data |
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6fc6879b JM |
1 | /* |
2 | * WPA Supplicant - IEEE 802.11r - Fast BSS Transition | |
98cd3d1c | 3 | * Copyright (c) 2006-2015, Jouni Malinen <j@w1.fi> |
6fc6879b | 4 | * |
0f3d578e JM |
5 | * This software may be distributed under the terms of the BSD license. |
6 | * See README for more details. | |
6fc6879b JM |
7 | */ |
8 | ||
9 | #include "includes.h" | |
10 | ||
11 | #include "common.h" | |
03da66bd | 12 | #include "crypto/aes_wrap.h" |
3642c431 | 13 | #include "crypto/random.h" |
03da66bd JM |
14 | #include "common/ieee802_11_defs.h" |
15 | #include "common/ieee802_11_common.h" | |
6fc6879b JM |
16 | #include "wpa.h" |
17 | #include "wpa_i.h" | |
6fc6879b JM |
18 | |
19 | #ifdef CONFIG_IEEE80211R | |
20 | ||
21 | int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr, | |
98cd3d1c | 22 | const struct wpa_eapol_key *key, struct wpa_ptk *ptk) |
6fc6879b | 23 | { |
6fc6879b JM |
24 | u8 ptk_name[WPA_PMK_NAME_LEN]; |
25 | const u8 *anonce = key->key_nonce; | |
26 | ||
27 | if (sm->xxkey_len == 0) { | |
28 | wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " | |
29 | "derivation"); | |
30 | return -1; | |
31 | } | |
32 | ||
33 | wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid, | |
34 | sm->ssid_len, sm->mobility_domain, | |
35 | sm->r0kh_id, sm->r0kh_id_len, sm->own_addr, | |
36 | sm->pmk_r0, sm->pmk_r0_name); | |
37 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN); | |
38 | wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", | |
39 | sm->pmk_r0_name, WPA_PMK_NAME_LEN); | |
40 | wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, | |
26e23750 | 41 | sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); |
6fc6879b | 42 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); |
26e23750 JM |
43 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, |
44 | WPA_PMK_NAME_LEN); | |
98cd3d1c JM |
45 | return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr, |
46 | sm->bssid, sm->pmk_r1_name, ptk, ptk_name, | |
47 | sm->key_mgmt, sm->pairwise_cipher); | |
6fc6879b JM |
48 | } |
49 | ||
50 | ||
51 | /** | |
52 | * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters | |
53 | * @sm: Pointer to WPA state machine data from wpa_sm_init() | |
e7846b68 JM |
54 | * @ies: Association Response IEs or %NULL to clear FT parameters |
55 | * @ies_len: Length of ies buffer in octets | |
6fc6879b JM |
56 | * Returns: 0 on success, -1 on failure |
57 | */ | |
e7846b68 | 58 | int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len) |
6fc6879b | 59 | { |
e7846b68 JM |
60 | struct wpa_ft_ies ft; |
61 | ||
62 | if (sm == NULL) | |
63 | return 0; | |
64 | ||
65 | if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0) | |
66 | return -1; | |
67 | ||
68 | if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1) | |
69 | return -1; | |
70 | ||
71 | if (ft.mdie) { | |
6fc6879b | 72 | wpa_hexdump(MSG_DEBUG, "FT: Mobility domain", |
e7846b68 JM |
73 | ft.mdie, MOBILITY_DOMAIN_ID_LEN); |
74 | os_memcpy(sm->mobility_domain, ft.mdie, | |
6fc6879b | 75 | MOBILITY_DOMAIN_ID_LEN); |
e7846b68 | 76 | sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN]; |
f4ec630d JM |
77 | wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x", |
78 | sm->mdie_ft_capab); | |
e7846b68 | 79 | } else |
6fc6879b JM |
80 | os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN); |
81 | ||
e7846b68 JM |
82 | if (ft.r0kh_id) { |
83 | wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", | |
84 | ft.r0kh_id, ft.r0kh_id_len); | |
85 | os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len); | |
86 | sm->r0kh_id_len = ft.r0kh_id_len; | |
87 | } else { | |
6fc6879b JM |
88 | /* FIX: When should R0KH-ID be cleared? We need to keep the |
89 | * old R0KH-ID in order to be able to use this during FT. */ | |
90 | /* | |
91 | * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN); | |
92 | * sm->r0kh_id_len = 0; | |
93 | */ | |
94 | } | |
95 | ||
e7846b68 JM |
96 | if (ft.r1kh_id) { |
97 | wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", | |
98 | ft.r1kh_id, FT_R1KH_ID_LEN); | |
99 | os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN); | |
100 | } else | |
6fc6879b JM |
101 | os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN); |
102 | ||
55046414 JM |
103 | os_free(sm->assoc_resp_ies); |
104 | sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2); | |
105 | if (sm->assoc_resp_ies) { | |
106 | u8 *pos = sm->assoc_resp_ies; | |
107 | if (ft.mdie) { | |
108 | os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2); | |
109 | pos += ft.mdie_len + 2; | |
110 | } | |
111 | if (ft.ftie) { | |
112 | os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2); | |
113 | pos += ft.ftie_len + 2; | |
114 | } | |
115 | sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies; | |
116 | wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from " | |
117 | "(Re)Association Response", | |
118 | sm->assoc_resp_ies, sm->assoc_resp_ies_len); | |
119 | } | |
120 | ||
6fc6879b JM |
121 | return 0; |
122 | } | |
123 | ||
124 | ||
125 | /** | |
babfbf15 | 126 | * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request |
6fc6879b JM |
127 | * @sm: Pointer to WPA state machine data from wpa_sm_init() |
128 | * @len: Buffer for returning the length of the IEs | |
129 | * @anonce: ANonce or %NULL if not yet available | |
130 | * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List | |
131 | * @kck: 128-bit KCK for MIC or %NULL if no MIC is used | |
98cd3d1c | 132 | * @kck_len: KCK length in octets |
6fc6879b | 133 | * @target_ap: Target AP address |
babfbf15 JM |
134 | * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL |
135 | * @ric_ies_len: Length of ric_ies buffer in octets | |
76b7981d | 136 | * @ap_mdie: Mobility Domain IE from the target AP |
6fc6879b JM |
137 | * Returns: Pointer to buffer with IEs or %NULL on failure |
138 | * | |
139 | * Caller is responsible for freeing the returned buffer with os_free(); | |
140 | */ | |
141 | static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len, | |
142 | const u8 *anonce, const u8 *pmk_name, | |
98cd3d1c JM |
143 | const u8 *kck, size_t kck_len, |
144 | const u8 *target_ap, | |
76b7981d JM |
145 | const u8 *ric_ies, size_t ric_ies_len, |
146 | const u8 *ap_mdie) | |
6fc6879b JM |
147 | { |
148 | size_t buf_len; | |
ccfab35a | 149 | u8 *buf, *pos, *ftie_len, *ftie_pos; |
6fc6879b JM |
150 | struct rsn_mdie *mdie; |
151 | struct rsn_ftie *ftie; | |
152 | struct rsn_ie_hdr *rsnie; | |
153 | u16 capab; | |
154 | ||
155 | sm->ft_completed = 0; | |
156 | ||
157 | buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + | |
babfbf15 | 158 | 2 + sm->r0kh_id_len + ric_ies_len + 100; |
6fc6879b JM |
159 | buf = os_zalloc(buf_len); |
160 | if (buf == NULL) | |
161 | return NULL; | |
162 | pos = buf; | |
163 | ||
babfbf15 | 164 | /* RSNIE[PMKR0Name/PMKR1Name] */ |
6fc6879b JM |
165 | rsnie = (struct rsn_ie_hdr *) pos; |
166 | rsnie->elem_id = WLAN_EID_RSN; | |
167 | WPA_PUT_LE16(rsnie->version, RSN_VERSION); | |
168 | pos = (u8 *) (rsnie + 1); | |
169 | ||
170 | /* Group Suite Selector */ | |
05a90d78 | 171 | if (!wpa_cipher_valid_group(sm->group_cipher)) { |
6fc6879b JM |
172 | wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)", |
173 | sm->group_cipher); | |
174 | os_free(buf); | |
175 | return NULL; | |
176 | } | |
c3550295 JM |
177 | RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, |
178 | sm->group_cipher)); | |
6fc6879b JM |
179 | pos += RSN_SELECTOR_LEN; |
180 | ||
181 | /* Pairwise Suite Count */ | |
182 | WPA_PUT_LE16(pos, 1); | |
183 | pos += 2; | |
184 | ||
185 | /* Pairwise Suite List */ | |
c3550295 | 186 | if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { |
6fc6879b JM |
187 | wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)", |
188 | sm->pairwise_cipher); | |
189 | os_free(buf); | |
190 | return NULL; | |
191 | } | |
c3550295 JM |
192 | RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, |
193 | sm->pairwise_cipher)); | |
6fc6879b JM |
194 | pos += RSN_SELECTOR_LEN; |
195 | ||
196 | /* Authenticated Key Management Suite Count */ | |
197 | WPA_PUT_LE16(pos, 1); | |
198 | pos += 2; | |
199 | ||
200 | /* Authenticated Key Management Suite List */ | |
201 | if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) | |
202 | RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); | |
203 | else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK) | |
204 | RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); | |
aa189ac9 JM |
205 | else if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE) |
206 | RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE); | |
6fc6879b JM |
207 | else { |
208 | wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)", | |
209 | sm->key_mgmt); | |
210 | os_free(buf); | |
211 | return NULL; | |
212 | } | |
213 | pos += RSN_SELECTOR_LEN; | |
214 | ||
215 | /* RSN Capabilities */ | |
216 | capab = 0; | |
217 | #ifdef CONFIG_IEEE80211W | |
218 | if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) | |
0b60b0aa | 219 | capab |= WPA_CAPABILITY_MFPC; |
6fc6879b JM |
220 | #endif /* CONFIG_IEEE80211W */ |
221 | WPA_PUT_LE16(pos, capab); | |
222 | pos += 2; | |
223 | ||
224 | /* PMKID Count */ | |
225 | WPA_PUT_LE16(pos, 1); | |
226 | pos += 2; | |
227 | ||
228 | /* PMKID List [PMKR0Name/PMKR1Name] */ | |
229 | os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN); | |
230 | pos += WPA_PMK_NAME_LEN; | |
231 | ||
232 | #ifdef CONFIG_IEEE80211W | |
233 | if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { | |
234 | /* Management Group Cipher Suite */ | |
235 | RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); | |
236 | pos += RSN_SELECTOR_LEN; | |
237 | } | |
238 | #endif /* CONFIG_IEEE80211W */ | |
239 | ||
240 | rsnie->len = (pos - (u8 *) rsnie) - 2; | |
241 | ||
242 | /* MDIE */ | |
243 | *pos++ = WLAN_EID_MOBILITY_DOMAIN; | |
244 | *pos++ = sizeof(*mdie); | |
245 | mdie = (struct rsn_mdie *) pos; | |
246 | pos += sizeof(*mdie); | |
247 | os_memcpy(mdie->mobility_domain, sm->mobility_domain, | |
248 | MOBILITY_DOMAIN_ID_LEN); | |
f4ec630d JM |
249 | mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] : |
250 | sm->mdie_ft_capab; | |
6fc6879b | 251 | |
3db65314 | 252 | /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */ |
ccfab35a | 253 | ftie_pos = pos; |
6fc6879b JM |
254 | *pos++ = WLAN_EID_FAST_BSS_TRANSITION; |
255 | ftie_len = pos++; | |
256 | ftie = (struct rsn_ftie *) pos; | |
257 | pos += sizeof(*ftie); | |
258 | os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN); | |
259 | if (anonce) | |
260 | os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN); | |
3db65314 JM |
261 | if (kck) { |
262 | /* R1KH-ID sub-element in third FT message */ | |
263 | *pos++ = FTIE_SUBELEM_R1KH_ID; | |
264 | *pos++ = FT_R1KH_ID_LEN; | |
265 | os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN); | |
266 | pos += FT_R1KH_ID_LEN; | |
267 | } | |
6fc6879b JM |
268 | /* R0KH-ID sub-element */ |
269 | *pos++ = FTIE_SUBELEM_R0KH_ID; | |
270 | *pos++ = sm->r0kh_id_len; | |
271 | os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len); | |
272 | pos += sm->r0kh_id_len; | |
273 | *ftie_len = pos - ftie_len - 1; | |
274 | ||
babfbf15 JM |
275 | if (ric_ies) { |
276 | /* RIC Request */ | |
277 | os_memcpy(pos, ric_ies, ric_ies_len); | |
278 | pos += ric_ies_len; | |
279 | } | |
280 | ||
6fc6879b JM |
281 | if (kck) { |
282 | /* | |
c1e033b0 | 283 | * IEEE Std 802.11r-2008, 11A.8.4 |
6fc6879b JM |
284 | * MIC shall be calculated over: |
285 | * non-AP STA MAC address | |
286 | * Target AP MAC address | |
287 | * Transaction seq number (5 for ReassocReq, 3 otherwise) | |
288 | * RSN IE | |
289 | * MDIE | |
290 | * FTIE (with MIC field set to 0) | |
291 | * RIC-Request (if present) | |
292 | */ | |
babfbf15 JM |
293 | /* Information element count */ |
294 | ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies, | |
295 | ric_ies_len); | |
98cd3d1c | 296 | if (wpa_ft_mic(kck, kck_len, sm->own_addr, target_ap, 5, |
6fc6879b | 297 | ((u8 *) mdie) - 2, 2 + sizeof(*mdie), |
ccfab35a | 298 | ftie_pos, 2 + *ftie_len, |
babfbf15 JM |
299 | (u8 *) rsnie, 2 + rsnie->len, ric_ies, |
300 | ric_ies_len, ftie->mic) < 0) { | |
6fc6879b JM |
301 | wpa_printf(MSG_INFO, "FT: Failed to calculate MIC"); |
302 | os_free(buf); | |
303 | return NULL; | |
304 | } | |
305 | } | |
306 | ||
307 | *len = pos - buf; | |
308 | ||
309 | return buf; | |
310 | } | |
311 | ||
312 | ||
6fc6879b JM |
313 | static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid) |
314 | { | |
315 | int keylen; | |
71934751 | 316 | enum wpa_alg alg; |
6fc6879b JM |
317 | u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 }; |
318 | ||
319 | wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver."); | |
320 | ||
c3550295 | 321 | if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { |
6fc6879b JM |
322 | wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d", |
323 | sm->pairwise_cipher); | |
324 | return -1; | |
325 | } | |
326 | ||
c3550295 JM |
327 | alg = wpa_cipher_to_alg(sm->pairwise_cipher); |
328 | keylen = wpa_cipher_key_len(sm->pairwise_cipher); | |
329 | ||
6fc6879b | 330 | if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc, |
98cd3d1c | 331 | sizeof(null_rsc), (u8 *) sm->ptk.tk, keylen) < 0) { |
6fc6879b JM |
332 | wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver"); |
333 | return -1; | |
334 | } | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | ||
340 | /** | |
341 | * wpa_ft_prepare_auth_request - Generate over-the-air auth request | |
342 | * @sm: Pointer to WPA state machine data from wpa_sm_init() | |
76b7981d | 343 | * @mdie: Target AP MDIE |
6fc6879b JM |
344 | * Returns: 0 on success, -1 on failure |
345 | */ | |
76b7981d | 346 | int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie) |
6fc6879b JM |
347 | { |
348 | u8 *ft_ies; | |
349 | size_t ft_ies_len; | |
350 | ||
351 | /* Generate a new SNonce */ | |
3642c431 | 352 | if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { |
6fc6879b JM |
353 | wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); |
354 | return -1; | |
355 | } | |
356 | ||
357 | ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, | |
98cd3d1c | 358 | NULL, 0, sm->bssid, NULL, 0, mdie); |
6fc6879b JM |
359 | if (ft_ies) { |
360 | wpa_sm_update_ft_ies(sm, sm->mobility_domain, | |
361 | ft_ies, ft_ies_len); | |
362 | os_free(ft_ies); | |
363 | } | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | ||
369 | int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len, | |
babfbf15 JM |
370 | int ft_action, const u8 *target_ap, |
371 | const u8 *ric_ies, size_t ric_ies_len) | |
6fc6879b JM |
372 | { |
373 | u8 *ft_ies; | |
98cd3d1c | 374 | size_t ft_ies_len; |
6fc6879b JM |
375 | struct wpa_ft_ies parse; |
376 | struct rsn_mdie *mdie; | |
377 | struct rsn_ftie *ftie; | |
378 | u8 ptk_name[WPA_PMK_NAME_LEN]; | |
379 | int ret; | |
380 | const u8 *bssid; | |
381 | ||
382 | wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); | |
babfbf15 | 383 | wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len); |
6fc6879b JM |
384 | |
385 | if (ft_action) { | |
386 | if (!sm->over_the_ds_in_progress) { | |
387 | wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " | |
388 | "- drop FT Action Response"); | |
389 | return -1; | |
390 | } | |
391 | ||
392 | if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) { | |
393 | wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " | |
394 | "with this Target AP - drop FT Action " | |
395 | "Response"); | |
396 | return -1; | |
397 | } | |
398 | } | |
399 | ||
aa189ac9 | 400 | if (!wpa_key_mgmt_ft(sm->key_mgmt)) { |
6fc6879b JM |
401 | wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " |
402 | "enabled for this connection"); | |
403 | return -1; | |
404 | } | |
405 | ||
406 | if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { | |
407 | wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); | |
408 | return -1; | |
409 | } | |
410 | ||
411 | mdie = (struct rsn_mdie *) parse.mdie; | |
412 | if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || | |
413 | os_memcmp(mdie->mobility_domain, sm->mobility_domain, | |
414 | MOBILITY_DOMAIN_ID_LEN) != 0) { | |
415 | wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); | |
416 | return -1; | |
417 | } | |
418 | ||
419 | ftie = (struct rsn_ftie *) parse.ftie; | |
420 | if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { | |
421 | wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); | |
422 | return -1; | |
423 | } | |
424 | ||
148fb67d JM |
425 | if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { |
426 | wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); | |
427 | wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", | |
428 | ftie->snonce, WPA_NONCE_LEN); | |
429 | wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", | |
430 | sm->snonce, WPA_NONCE_LEN); | |
431 | return -1; | |
432 | } | |
433 | ||
6fc6879b JM |
434 | if (parse.r0kh_id == NULL) { |
435 | wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); | |
436 | return -1; | |
437 | } | |
438 | ||
439 | if (parse.r0kh_id_len != sm->r0kh_id_len || | |
0d15b69f JM |
440 | os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) |
441 | { | |
6fc6879b JM |
442 | wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " |
443 | "the current R0KH-ID"); | |
444 | wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", | |
445 | parse.r0kh_id, parse.r0kh_id_len); | |
446 | wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", | |
447 | sm->r0kh_id, sm->r0kh_id_len); | |
448 | return -1; | |
449 | } | |
450 | ||
451 | if (parse.r1kh_id == NULL) { | |
452 | wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); | |
453 | return -1; | |
454 | } | |
455 | ||
456 | if (parse.rsn_pmkid == NULL || | |
0d15b69f JM |
457 | os_memcmp_const(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) |
458 | { | |
6fc6879b JM |
459 | wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in " |
460 | "RSNIE"); | |
461 | return -1; | |
462 | } | |
463 | ||
464 | os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN); | |
465 | wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN); | |
466 | wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN); | |
467 | wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN); | |
148fb67d | 468 | os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN); |
6fc6879b JM |
469 | wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, |
470 | sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); | |
471 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); | |
472 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", | |
473 | sm->pmk_r1_name, WPA_PMK_NAME_LEN); | |
474 | ||
658d1662 | 475 | bssid = target_ap; |
98cd3d1c JM |
476 | if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, |
477 | sm->own_addr, bssid, sm->pmk_r1_name, &sm->ptk, | |
478 | ptk_name, sm->key_mgmt, sm->pairwise_cipher) < 0) | |
479 | return -1; | |
6fc6879b JM |
480 | |
481 | ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce, | |
98cd3d1c JM |
482 | sm->pmk_r1_name, |
483 | sm->ptk.kck, sm->ptk.kck_len, bssid, | |
76b7981d JM |
484 | ric_ies, ric_ies_len, |
485 | parse.mdie ? parse.mdie - 2 : NULL); | |
6fc6879b JM |
486 | if (ft_ies) { |
487 | wpa_sm_update_ft_ies(sm, sm->mobility_domain, | |
488 | ft_ies, ft_ies_len); | |
489 | os_free(ft_ies); | |
490 | } | |
491 | ||
2a7e7f4e | 492 | wpa_sm_mark_authenticated(sm, bssid); |
6fc6879b | 493 | ret = wpa_ft_install_ptk(sm, bssid); |
86f7b62a JM |
494 | if (ret) { |
495 | /* | |
496 | * Some drivers do not support key configuration when we are | |
497 | * not associated with the target AP. Work around this by | |
498 | * trying again after the following reassociation gets | |
499 | * completed. | |
500 | */ | |
501 | wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to " | |
502 | "association - try again after reassociation"); | |
503 | sm->set_ptk_after_assoc = 1; | |
504 | } else | |
505 | sm->set_ptk_after_assoc = 0; | |
6fc6879b | 506 | |
86f7b62a JM |
507 | sm->ft_completed = 1; |
508 | if (ft_action) { | |
509 | /* | |
510 | * The caller is expected trigger re-association with the | |
511 | * Target AP. | |
512 | */ | |
513 | os_memcpy(sm->bssid, target_ap, ETH_ALEN); | |
6fc6879b JM |
514 | } |
515 | ||
86f7b62a | 516 | return 0; |
6fc6879b JM |
517 | } |
518 | ||
519 | ||
520 | int wpa_ft_is_completed(struct wpa_sm *sm) | |
521 | { | |
522 | if (sm == NULL) | |
523 | return 0; | |
524 | ||
aa189ac9 | 525 | if (!wpa_key_mgmt_ft(sm->key_mgmt)) |
6fc6879b JM |
526 | return 0; |
527 | ||
528 | return sm->ft_completed; | |
529 | } | |
530 | ||
531 | ||
02db75b6 DG |
532 | void wpa_reset_ft_completed(struct wpa_sm *sm) |
533 | { | |
534 | if (sm != NULL) | |
535 | sm->ft_completed = 0; | |
536 | } | |
537 | ||
538 | ||
b27f13ed JM |
539 | static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem, |
540 | size_t gtk_elem_len) | |
541 | { | |
542 | u8 gtk[32]; | |
543 | int keyidx; | |
71934751 | 544 | enum wpa_alg alg; |
b27f13ed JM |
545 | size_t gtk_len, keylen, rsc_len; |
546 | ||
547 | if (gtk_elem == NULL) { | |
548 | wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE"); | |
549 | return 0; | |
550 | } | |
551 | ||
552 | wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp", | |
553 | gtk_elem, gtk_elem_len); | |
554 | ||
39eb4d08 JM |
555 | if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 || |
556 | gtk_elem_len - 19 > sizeof(gtk)) { | |
b27f13ed JM |
557 | wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem " |
558 | "length %lu", (unsigned long) gtk_elem_len); | |
559 | return -1; | |
560 | } | |
39eb4d08 | 561 | gtk_len = gtk_elem_len - 19; |
98cd3d1c JM |
562 | if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, gtk_len / 8, gtk_elem + 11, |
563 | gtk)) { | |
b27f13ed JM |
564 | wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " |
565 | "decrypt GTK"); | |
566 | return -1; | |
567 | } | |
568 | ||
c3550295 JM |
569 | keylen = wpa_cipher_key_len(sm->group_cipher); |
570 | rsc_len = wpa_cipher_rsc_len(sm->group_cipher); | |
571 | alg = wpa_cipher_to_alg(sm->group_cipher); | |
572 | if (alg == WPA_ALG_NONE) { | |
b27f13ed JM |
573 | wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d", |
574 | sm->group_cipher); | |
575 | return -1; | |
576 | } | |
577 | ||
578 | if (gtk_len < keylen) { | |
579 | wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE"); | |
580 | return -1; | |
581 | } | |
582 | ||
39eb4d08 | 583 | /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */ |
b27f13ed | 584 | |
39eb4d08 | 585 | keyidx = WPA_GET_LE16(gtk_elem) & 0x03; |
b27f13ed | 586 | |
39eb4d08 | 587 | if (gtk_elem[2] != keylen) { |
b27f13ed JM |
588 | wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d " |
589 | "negotiated %lu", | |
39eb4d08 | 590 | gtk_elem[2], (unsigned long) keylen); |
b27f13ed JM |
591 | return -1; |
592 | } | |
593 | ||
594 | wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen); | |
b54c9ff9 JM |
595 | if (sm->group_cipher == WPA_CIPHER_TKIP) { |
596 | /* Swap Tx/Rx keys for Michael MIC */ | |
597 | u8 tmp[8]; | |
598 | os_memcpy(tmp, gtk + 16, 8); | |
599 | os_memcpy(gtk + 16, gtk + 24, 8); | |
600 | os_memcpy(gtk + 24, tmp, 8); | |
601 | } | |
0382097e JM |
602 | if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0, |
603 | gtk_elem + 3, rsc_len, gtk, keylen) < 0) { | |
b27f13ed JM |
604 | wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the " |
605 | "driver."); | |
606 | return -1; | |
607 | } | |
608 | ||
609 | return 0; | |
610 | } | |
611 | ||
612 | ||
613 | #ifdef CONFIG_IEEE80211W | |
614 | static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem, | |
615 | size_t igtk_elem_len) | |
616 | { | |
617 | u8 igtk[WPA_IGTK_LEN]; | |
618 | u16 keyidx; | |
619 | ||
620 | if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) | |
621 | return 0; | |
622 | ||
623 | if (igtk_elem == NULL) { | |
624 | wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE"); | |
625 | return 0; | |
626 | } | |
627 | ||
628 | wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp", | |
629 | igtk_elem, igtk_elem_len); | |
630 | ||
ff89afb7 | 631 | if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) { |
b27f13ed JM |
632 | wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem " |
633 | "length %lu", (unsigned long) igtk_elem_len); | |
634 | return -1; | |
635 | } | |
ff89afb7 JM |
636 | if (igtk_elem[8] != WPA_IGTK_LEN) { |
637 | wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length " | |
638 | "%d", igtk_elem[8]); | |
639 | return -1; | |
640 | } | |
641 | ||
98cd3d1c JM |
642 | if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, WPA_IGTK_LEN / 8, |
643 | igtk_elem + 9, igtk)) { | |
b27f13ed JM |
644 | wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " |
645 | "decrypt IGTK"); | |
646 | return -1; | |
647 | } | |
648 | ||
ff89afb7 | 649 | /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */ |
b27f13ed JM |
650 | |
651 | keyidx = WPA_GET_LE16(igtk_elem); | |
652 | ||
653 | wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk, | |
654 | WPA_IGTK_LEN); | |
0382097e JM |
655 | if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0, |
656 | igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) { | |
b27f13ed JM |
657 | wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the " |
658 | "driver."); | |
659 | return -1; | |
660 | } | |
661 | ||
662 | return 0; | |
663 | } | |
664 | #endif /* CONFIG_IEEE80211W */ | |
665 | ||
666 | ||
6fc6879b | 667 | int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies, |
658d1662 | 668 | size_t ies_len, const u8 *src_addr) |
6fc6879b JM |
669 | { |
670 | struct wpa_ft_ies parse; | |
671 | struct rsn_mdie *mdie; | |
672 | struct rsn_ftie *ftie; | |
8aaf894d | 673 | unsigned int count; |
98cd3d1c | 674 | u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; |
6fc6879b JM |
675 | |
676 | wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); | |
677 | ||
aa189ac9 | 678 | if (!wpa_key_mgmt_ft(sm->key_mgmt)) { |
6fc6879b JM |
679 | wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " |
680 | "enabled for this connection"); | |
681 | return -1; | |
682 | } | |
683 | ||
684 | if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { | |
685 | wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); | |
686 | return -1; | |
687 | } | |
688 | ||
689 | mdie = (struct rsn_mdie *) parse.mdie; | |
690 | if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || | |
691 | os_memcmp(mdie->mobility_domain, sm->mobility_domain, | |
692 | MOBILITY_DOMAIN_ID_LEN) != 0) { | |
693 | wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); | |
694 | return -1; | |
695 | } | |
696 | ||
697 | ftie = (struct rsn_ftie *) parse.ftie; | |
698 | if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { | |
699 | wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); | |
700 | return -1; | |
701 | } | |
702 | ||
148fb67d JM |
703 | if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { |
704 | wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); | |
705 | wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", | |
706 | ftie->snonce, WPA_NONCE_LEN); | |
707 | wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", | |
708 | sm->snonce, WPA_NONCE_LEN); | |
709 | return -1; | |
710 | } | |
711 | ||
712 | if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) { | |
713 | wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); | |
714 | wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", | |
715 | ftie->anonce, WPA_NONCE_LEN); | |
716 | wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", | |
717 | sm->anonce, WPA_NONCE_LEN); | |
718 | return -1; | |
719 | } | |
720 | ||
6fc6879b JM |
721 | if (parse.r0kh_id == NULL) { |
722 | wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); | |
723 | return -1; | |
724 | } | |
725 | ||
726 | if (parse.r0kh_id_len != sm->r0kh_id_len || | |
0d15b69f JM |
727 | os_memcmp_const(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) |
728 | { | |
6fc6879b JM |
729 | wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " |
730 | "the current R0KH-ID"); | |
731 | wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", | |
732 | parse.r0kh_id, parse.r0kh_id_len); | |
733 | wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", | |
734 | sm->r0kh_id, sm->r0kh_id_len); | |
735 | return -1; | |
736 | } | |
737 | ||
738 | if (parse.r1kh_id == NULL) { | |
739 | wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); | |
740 | return -1; | |
741 | } | |
742 | ||
0d15b69f | 743 | if (os_memcmp_const(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) { |
6fc6879b JM |
744 | wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " |
745 | "ReassocResp"); | |
746 | return -1; | |
747 | } | |
748 | ||
749 | if (parse.rsn_pmkid == NULL || | |
0d15b69f JM |
750 | os_memcmp_const(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) |
751 | { | |
6fc6879b JM |
752 | wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " |
753 | "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); | |
754 | return -1; | |
755 | } | |
756 | ||
757 | count = 3; | |
c284b461 HW |
758 | if (parse.ric) |
759 | count += ieee802_11_ie_count(parse.ric, parse.ric_len); | |
8aaf894d JM |
760 | if (ftie->mic_control[1] != count) { |
761 | wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " | |
762 | "Control: received %u expected %u", | |
763 | ftie->mic_control[1], count); | |
764 | return -1; | |
765 | } | |
6fc6879b | 766 | |
98cd3d1c | 767 | if (wpa_ft_mic(sm->ptk.kck, sm->ptk.kck_len, sm->own_addr, src_addr, 6, |
6fc6879b JM |
768 | parse.mdie - 2, parse.mdie_len + 2, |
769 | parse.ftie - 2, parse.ftie_len + 2, | |
f238cf9f JM |
770 | parse.rsn - 2, parse.rsn_len + 2, |
771 | parse.ric, parse.ric_len, | |
6fc6879b JM |
772 | mic) < 0) { |
773 | wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); | |
774 | return -1; | |
775 | } | |
776 | ||
0d15b69f | 777 | if (os_memcmp_const(mic, ftie->mic, 16) != 0) { |
6fc6879b JM |
778 | wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); |
779 | wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); | |
780 | wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); | |
781 | return -1; | |
782 | } | |
783 | ||
b27f13ed | 784 | if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0) |
6fc6879b | 785 | return -1; |
6fc6879b | 786 | |
b27f13ed JM |
787 | #ifdef CONFIG_IEEE80211W |
788 | if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0) | |
6fc6879b | 789 | return -1; |
b27f13ed | 790 | #endif /* CONFIG_IEEE80211W */ |
6fc6879b | 791 | |
86f7b62a JM |
792 | if (sm->set_ptk_after_assoc) { |
793 | wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we " | |
794 | "are associated"); | |
795 | if (wpa_ft_install_ptk(sm, src_addr) < 0) | |
796 | return -1; | |
797 | sm->set_ptk_after_assoc = 0; | |
798 | } | |
799 | ||
f238cf9f JM |
800 | if (parse.ric) { |
801 | wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response", | |
802 | parse.ric, parse.ric_len); | |
6a1ce395 DG |
803 | /* TODO: parse response and inform driver about results when |
804 | * using wpa_supplicant SME */ | |
f238cf9f JM |
805 | } |
806 | ||
6a1ce395 DG |
807 | wpa_printf(MSG_DEBUG, "FT: Completed successfully"); |
808 | ||
6fc6879b JM |
809 | return 0; |
810 | } | |
811 | ||
812 | ||
813 | /** | |
814 | * wpa_ft_start_over_ds - Generate over-the-DS auth request | |
815 | * @sm: Pointer to WPA state machine data from wpa_sm_init() | |
76b7981d JM |
816 | * @target_ap: Target AP Address |
817 | * @mdie: Mobility Domain IE from the target AP | |
6fc6879b JM |
818 | * Returns: 0 on success, -1 on failure |
819 | */ | |
76b7981d JM |
820 | int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap, |
821 | const u8 *mdie) | |
6fc6879b JM |
822 | { |
823 | u8 *ft_ies; | |
824 | size_t ft_ies_len; | |
825 | ||
826 | wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR, | |
827 | MAC2STR(target_ap)); | |
828 | ||
829 | /* Generate a new SNonce */ | |
3642c431 | 830 | if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { |
6fc6879b JM |
831 | wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); |
832 | return -1; | |
833 | } | |
834 | ||
835 | ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, | |
98cd3d1c | 836 | NULL, 0, target_ap, NULL, 0, mdie); |
6fc6879b JM |
837 | if (ft_ies) { |
838 | sm->over_the_ds_in_progress = 1; | |
839 | os_memcpy(sm->target_ap, target_ap, ETH_ALEN); | |
840 | wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len); | |
841 | os_free(ft_ies); | |
842 | } | |
843 | ||
844 | return 0; | |
845 | } | |
846 | ||
847 | #endif /* CONFIG_IEEE80211R */ |