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Commit | Line | Data |
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6fc6879b JM |
1 | /* |
2 | * WPA Supplicant - IEEE 802.11r - Fast BSS Transition | |
3 | * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi> | |
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, | |
22 | const struct wpa_eapol_key *key, | |
c0a61908 | 23 | struct wpa_ptk *ptk, size_t ptk_len) |
6fc6879b | 24 | { |
6fc6879b JM |
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, | |
26e23750 | 42 | sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); |
6fc6879b | 43 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); |
26e23750 JM |
44 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, |
45 | WPA_PMK_NAME_LEN); | |
6fc6879b | 46 | wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr, |
26e23750 | 47 | sm->bssid, sm->pmk_r1_name, |
c0a61908 JM |
48 | (u8 *) ptk, ptk_len, ptk_name); |
49 | wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len); | |
6fc6879b JM |
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() | |
e7846b68 JM |
59 | * @ies: Association Response IEs or %NULL to clear FT parameters |
60 | * @ies_len: Length of ies buffer in octets | |
6fc6879b JM |
61 | * Returns: 0 on success, -1 on failure |
62 | */ | |
e7846b68 | 63 | int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len) |
6fc6879b | 64 | { |
e7846b68 JM |
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) { | |
6fc6879b | 77 | wpa_hexdump(MSG_DEBUG, "FT: Mobility domain", |
e7846b68 JM |
78 | ft.mdie, MOBILITY_DOMAIN_ID_LEN); |
79 | os_memcpy(sm->mobility_domain, ft.mdie, | |
6fc6879b | 80 | MOBILITY_DOMAIN_ID_LEN); |
e7846b68 | 81 | sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN]; |
f4ec630d JM |
82 | wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x", |
83 | sm->mdie_ft_capab); | |
e7846b68 | 84 | } else |
6fc6879b JM |
85 | os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN); |
86 | ||
e7846b68 JM |
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 { | |
6fc6879b JM |
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 | ||
e7846b68 JM |
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 | |
6fc6879b JM |
106 | os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN); |
107 | ||
55046414 JM |
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 | ||
6fc6879b JM |
126 | return 0; |
127 | } | |
128 | ||
129 | ||
130 | /** | |
babfbf15 | 131 | * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request |
6fc6879b JM |
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 | |
babfbf15 JM |
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 | |
76b7981d | 140 | * @ap_mdie: Mobility Domain IE from the target AP |
6fc6879b JM |
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 | */ | |
145 | static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len, | |
146 | const u8 *anonce, const u8 *pmk_name, | |
babfbf15 | 147 | const u8 *kck, const u8 *target_ap, |
76b7981d JM |
148 | const u8 *ric_ies, size_t ric_ies_len, |
149 | const u8 *ap_mdie) | |
6fc6879b JM |
150 | { |
151 | size_t buf_len; | |
ccfab35a | 152 | u8 *buf, *pos, *ftie_len, *ftie_pos; |
6fc6879b JM |
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) + | |
babfbf15 | 161 | 2 + sm->r0kh_id_len + ric_ies_len + 100; |
6fc6879b JM |
162 | buf = os_zalloc(buf_len); |
163 | if (buf == NULL) | |
164 | return NULL; | |
165 | pos = buf; | |
166 | ||
babfbf15 | 167 | /* RSNIE[PMKR0Name/PMKR1Name] */ |
6fc6879b JM |
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 */ | |
c3550295 JM |
174 | if (sm->group_cipher != WPA_CIPHER_CCMP && |
175 | sm->group_cipher != WPA_CIPHER_GCMP && | |
176 | sm->group_cipher != WPA_CIPHER_TKIP) { | |
6fc6879b JM |
177 | wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)", |
178 | sm->group_cipher); | |
179 | os_free(buf); | |
180 | return NULL; | |
181 | } | |
c3550295 JM |
182 | RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, |
183 | sm->group_cipher)); | |
6fc6879b JM |
184 | pos += RSN_SELECTOR_LEN; |
185 | ||
186 | /* Pairwise Suite Count */ | |
187 | WPA_PUT_LE16(pos, 1); | |
188 | pos += 2; | |
189 | ||
190 | /* Pairwise Suite List */ | |
c3550295 | 191 | if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { |
6fc6879b JM |
192 | wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)", |
193 | sm->pairwise_cipher); | |
194 | os_free(buf); | |
195 | return NULL; | |
196 | } | |
c3550295 JM |
197 | RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, |
198 | sm->pairwise_cipher)); | |
6fc6879b JM |
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); | |
210 | else { | |
211 | wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)", | |
212 | sm->key_mgmt); | |
213 | os_free(buf); | |
214 | return NULL; | |
215 | } | |
216 | pos += RSN_SELECTOR_LEN; | |
217 | ||
218 | /* RSN Capabilities */ | |
219 | capab = 0; | |
220 | #ifdef CONFIG_IEEE80211W | |
221 | if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) | |
0b60b0aa | 222 | capab |= WPA_CAPABILITY_MFPC; |
6fc6879b JM |
223 | #endif /* CONFIG_IEEE80211W */ |
224 | WPA_PUT_LE16(pos, capab); | |
225 | pos += 2; | |
226 | ||
227 | /* PMKID Count */ | |
228 | WPA_PUT_LE16(pos, 1); | |
229 | pos += 2; | |
230 | ||
231 | /* PMKID List [PMKR0Name/PMKR1Name] */ | |
232 | os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN); | |
233 | pos += WPA_PMK_NAME_LEN; | |
234 | ||
235 | #ifdef CONFIG_IEEE80211W | |
236 | if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { | |
237 | /* Management Group Cipher Suite */ | |
238 | RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); | |
239 | pos += RSN_SELECTOR_LEN; | |
240 | } | |
241 | #endif /* CONFIG_IEEE80211W */ | |
242 | ||
243 | rsnie->len = (pos - (u8 *) rsnie) - 2; | |
244 | ||
245 | /* MDIE */ | |
246 | *pos++ = WLAN_EID_MOBILITY_DOMAIN; | |
247 | *pos++ = sizeof(*mdie); | |
248 | mdie = (struct rsn_mdie *) pos; | |
249 | pos += sizeof(*mdie); | |
250 | os_memcpy(mdie->mobility_domain, sm->mobility_domain, | |
251 | MOBILITY_DOMAIN_ID_LEN); | |
f4ec630d JM |
252 | mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] : |
253 | sm->mdie_ft_capab; | |
6fc6879b | 254 | |
3db65314 | 255 | /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */ |
ccfab35a | 256 | ftie_pos = pos; |
6fc6879b JM |
257 | *pos++ = WLAN_EID_FAST_BSS_TRANSITION; |
258 | ftie_len = pos++; | |
259 | ftie = (struct rsn_ftie *) pos; | |
260 | pos += sizeof(*ftie); | |
261 | os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN); | |
262 | if (anonce) | |
263 | os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN); | |
3db65314 JM |
264 | if (kck) { |
265 | /* R1KH-ID sub-element in third FT message */ | |
266 | *pos++ = FTIE_SUBELEM_R1KH_ID; | |
267 | *pos++ = FT_R1KH_ID_LEN; | |
268 | os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN); | |
269 | pos += FT_R1KH_ID_LEN; | |
270 | } | |
6fc6879b JM |
271 | /* R0KH-ID sub-element */ |
272 | *pos++ = FTIE_SUBELEM_R0KH_ID; | |
273 | *pos++ = sm->r0kh_id_len; | |
274 | os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len); | |
275 | pos += sm->r0kh_id_len; | |
276 | *ftie_len = pos - ftie_len - 1; | |
277 | ||
babfbf15 JM |
278 | if (ric_ies) { |
279 | /* RIC Request */ | |
280 | os_memcpy(pos, ric_ies, ric_ies_len); | |
281 | pos += ric_ies_len; | |
282 | } | |
283 | ||
6fc6879b JM |
284 | if (kck) { |
285 | /* | |
c1e033b0 | 286 | * IEEE Std 802.11r-2008, 11A.8.4 |
6fc6879b JM |
287 | * MIC shall be calculated over: |
288 | * non-AP STA MAC address | |
289 | * Target AP MAC address | |
290 | * Transaction seq number (5 for ReassocReq, 3 otherwise) | |
291 | * RSN IE | |
292 | * MDIE | |
293 | * FTIE (with MIC field set to 0) | |
294 | * RIC-Request (if present) | |
295 | */ | |
babfbf15 JM |
296 | /* Information element count */ |
297 | ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies, | |
298 | ric_ies_len); | |
6fc6879b JM |
299 | if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5, |
300 | ((u8 *) mdie) - 2, 2 + sizeof(*mdie), | |
ccfab35a | 301 | ftie_pos, 2 + *ftie_len, |
babfbf15 JM |
302 | (u8 *) rsnie, 2 + rsnie->len, ric_ies, |
303 | ric_ies_len, ftie->mic) < 0) { | |
6fc6879b JM |
304 | wpa_printf(MSG_INFO, "FT: Failed to calculate MIC"); |
305 | os_free(buf); | |
306 | return NULL; | |
307 | } | |
308 | } | |
309 | ||
310 | *len = pos - buf; | |
311 | ||
312 | return buf; | |
313 | } | |
314 | ||
315 | ||
6fc6879b JM |
316 | static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid) |
317 | { | |
318 | int keylen; | |
71934751 | 319 | enum wpa_alg alg; |
6fc6879b JM |
320 | u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 }; |
321 | ||
322 | wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver."); | |
323 | ||
c3550295 | 324 | if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { |
6fc6879b JM |
325 | wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d", |
326 | sm->pairwise_cipher); | |
327 | return -1; | |
328 | } | |
329 | ||
c3550295 JM |
330 | alg = wpa_cipher_to_alg(sm->pairwise_cipher); |
331 | keylen = wpa_cipher_key_len(sm->pairwise_cipher); | |
332 | ||
6fc6879b JM |
333 | if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc, |
334 | sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) { | |
335 | wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver"); | |
336 | return -1; | |
337 | } | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | ||
343 | /** | |
344 | * wpa_ft_prepare_auth_request - Generate over-the-air auth request | |
345 | * @sm: Pointer to WPA state machine data from wpa_sm_init() | |
76b7981d | 346 | * @mdie: Target AP MDIE |
6fc6879b JM |
347 | * Returns: 0 on success, -1 on failure |
348 | */ | |
76b7981d | 349 | int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie) |
6fc6879b JM |
350 | { |
351 | u8 *ft_ies; | |
352 | size_t ft_ies_len; | |
353 | ||
354 | /* Generate a new SNonce */ | |
3642c431 | 355 | if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { |
6fc6879b JM |
356 | wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); |
357 | return -1; | |
358 | } | |
359 | ||
360 | ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, | |
76b7981d | 361 | NULL, sm->bssid, NULL, 0, mdie); |
6fc6879b JM |
362 | if (ft_ies) { |
363 | wpa_sm_update_ft_ies(sm, sm->mobility_domain, | |
364 | ft_ies, ft_ies_len); | |
365 | os_free(ft_ies); | |
366 | } | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | ||
372 | int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len, | |
babfbf15 JM |
373 | int ft_action, const u8 *target_ap, |
374 | const u8 *ric_ies, size_t ric_ies_len) | |
6fc6879b JM |
375 | { |
376 | u8 *ft_ies; | |
c0a61908 | 377 | size_t ft_ies_len, ptk_len; |
6fc6879b JM |
378 | struct wpa_ft_ies parse; |
379 | struct rsn_mdie *mdie; | |
380 | struct rsn_ftie *ftie; | |
381 | u8 ptk_name[WPA_PMK_NAME_LEN]; | |
382 | int ret; | |
383 | const u8 *bssid; | |
384 | ||
385 | wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); | |
babfbf15 | 386 | wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len); |
6fc6879b JM |
387 | |
388 | if (ft_action) { | |
389 | if (!sm->over_the_ds_in_progress) { | |
390 | wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " | |
391 | "- drop FT Action Response"); | |
392 | return -1; | |
393 | } | |
394 | ||
395 | if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) { | |
396 | wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " | |
397 | "with this Target AP - drop FT Action " | |
398 | "Response"); | |
399 | return -1; | |
400 | } | |
401 | } | |
402 | ||
403 | if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && | |
404 | sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { | |
405 | wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " | |
406 | "enabled for this connection"); | |
407 | return -1; | |
408 | } | |
409 | ||
410 | if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { | |
411 | wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); | |
412 | return -1; | |
413 | } | |
414 | ||
415 | mdie = (struct rsn_mdie *) parse.mdie; | |
416 | if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || | |
417 | os_memcmp(mdie->mobility_domain, sm->mobility_domain, | |
418 | MOBILITY_DOMAIN_ID_LEN) != 0) { | |
419 | wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); | |
420 | return -1; | |
421 | } | |
422 | ||
423 | ftie = (struct rsn_ftie *) parse.ftie; | |
424 | if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { | |
425 | wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); | |
426 | return -1; | |
427 | } | |
428 | ||
148fb67d JM |
429 | if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { |
430 | wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); | |
431 | wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", | |
432 | ftie->snonce, WPA_NONCE_LEN); | |
433 | wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", | |
434 | sm->snonce, WPA_NONCE_LEN); | |
435 | return -1; | |
436 | } | |
437 | ||
6fc6879b JM |
438 | if (parse.r0kh_id == NULL) { |
439 | wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); | |
440 | return -1; | |
441 | } | |
442 | ||
443 | if (parse.r0kh_id_len != sm->r0kh_id_len || | |
444 | os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { | |
445 | wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " | |
446 | "the current R0KH-ID"); | |
447 | wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", | |
448 | parse.r0kh_id, parse.r0kh_id_len); | |
449 | wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", | |
450 | sm->r0kh_id, sm->r0kh_id_len); | |
451 | return -1; | |
452 | } | |
453 | ||
454 | if (parse.r1kh_id == NULL) { | |
455 | wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); | |
456 | return -1; | |
457 | } | |
458 | ||
459 | if (parse.rsn_pmkid == NULL || | |
460 | os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) { | |
461 | wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in " | |
462 | "RSNIE"); | |
463 | return -1; | |
464 | } | |
465 | ||
466 | os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN); | |
467 | wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN); | |
468 | wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN); | |
469 | wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN); | |
148fb67d | 470 | os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN); |
6fc6879b JM |
471 | wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, |
472 | sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); | |
473 | wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); | |
474 | wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", | |
475 | sm->pmk_r1_name, WPA_PMK_NAME_LEN); | |
476 | ||
658d1662 | 477 | bssid = target_ap; |
eb7719ff | 478 | ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64; |
6fc6879b JM |
479 | wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr, |
480 | bssid, sm->pmk_r1_name, | |
c0a61908 | 481 | (u8 *) &sm->ptk, ptk_len, ptk_name); |
6fc6879b | 482 | wpa_hexdump_key(MSG_DEBUG, "FT: PTK", |
c0a61908 | 483 | (u8 *) &sm->ptk, ptk_len); |
6fc6879b JM |
484 | wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); |
485 | ||
486 | ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce, | |
babfbf15 | 487 | sm->pmk_r1_name, sm->ptk.kck, bssid, |
76b7981d JM |
488 | ric_ies, ric_ies_len, |
489 | parse.mdie ? parse.mdie - 2 : NULL); | |
6fc6879b JM |
490 | if (ft_ies) { |
491 | wpa_sm_update_ft_ies(sm, sm->mobility_domain, | |
492 | ft_ies, ft_ies_len); | |
493 | os_free(ft_ies); | |
494 | } | |
495 | ||
2a7e7f4e | 496 | wpa_sm_mark_authenticated(sm, bssid); |
6fc6879b | 497 | ret = wpa_ft_install_ptk(sm, bssid); |
86f7b62a JM |
498 | if (ret) { |
499 | /* | |
500 | * Some drivers do not support key configuration when we are | |
501 | * not associated with the target AP. Work around this by | |
502 | * trying again after the following reassociation gets | |
503 | * completed. | |
504 | */ | |
505 | wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to " | |
506 | "association - try again after reassociation"); | |
507 | sm->set_ptk_after_assoc = 1; | |
508 | } else | |
509 | sm->set_ptk_after_assoc = 0; | |
6fc6879b | 510 | |
86f7b62a JM |
511 | sm->ft_completed = 1; |
512 | if (ft_action) { | |
513 | /* | |
514 | * The caller is expected trigger re-association with the | |
515 | * Target AP. | |
516 | */ | |
517 | os_memcpy(sm->bssid, target_ap, ETH_ALEN); | |
6fc6879b JM |
518 | } |
519 | ||
86f7b62a | 520 | return 0; |
6fc6879b JM |
521 | } |
522 | ||
523 | ||
524 | int wpa_ft_is_completed(struct wpa_sm *sm) | |
525 | { | |
526 | if (sm == NULL) | |
527 | return 0; | |
528 | ||
529 | if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && | |
530 | sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) | |
531 | return 0; | |
532 | ||
533 | return sm->ft_completed; | |
534 | } | |
535 | ||
536 | ||
02db75b6 DG |
537 | void wpa_reset_ft_completed(struct wpa_sm *sm) |
538 | { | |
539 | if (sm != NULL) | |
540 | sm->ft_completed = 0; | |
541 | } | |
542 | ||
543 | ||
b27f13ed JM |
544 | static 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; | |
71934751 | 549 | enum wpa_alg alg; |
b27f13ed JM |
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 | ||
39eb4d08 JM |
560 | if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 || |
561 | gtk_elem_len - 19 > sizeof(gtk)) { | |
b27f13ed JM |
562 | wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem " |
563 | "length %lu", (unsigned long) gtk_elem_len); | |
564 | return -1; | |
565 | } | |
39eb4d08 JM |
566 | gtk_len = gtk_elem_len - 19; |
567 | if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) { | |
b27f13ed JM |
568 | wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " |
569 | "decrypt GTK"); | |
570 | return -1; | |
571 | } | |
572 | ||
c3550295 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) { | |
b27f13ed JM |
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 | ||
39eb4d08 | 587 | /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */ |
b27f13ed | 588 | |
39eb4d08 | 589 | keyidx = WPA_GET_LE16(gtk_elem) & 0x03; |
b27f13ed | 590 | |
39eb4d08 | 591 | if (gtk_elem[2] != keylen) { |
b27f13ed JM |
592 | wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d " |
593 | "negotiated %lu", | |
39eb4d08 | 594 | gtk_elem[2], (unsigned long) keylen); |
b27f13ed JM |
595 | return -1; |
596 | } | |
597 | ||
598 | wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen); | |
0382097e JM |
599 | if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0, |
600 | gtk_elem + 3, rsc_len, gtk, keylen) < 0) { | |
b27f13ed JM |
601 | wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the " |
602 | "driver."); | |
603 | return -1; | |
604 | } | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
609 | ||
610 | #ifdef CONFIG_IEEE80211W | |
611 | static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem, | |
612 | size_t igtk_elem_len) | |
613 | { | |
614 | u8 igtk[WPA_IGTK_LEN]; | |
615 | u16 keyidx; | |
616 | ||
617 | if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) | |
618 | return 0; | |
619 | ||
620 | if (igtk_elem == NULL) { | |
621 | wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE"); | |
622 | return 0; | |
623 | } | |
624 | ||
625 | wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp", | |
626 | igtk_elem, igtk_elem_len); | |
627 | ||
ff89afb7 | 628 | if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) { |
b27f13ed JM |
629 | wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem " |
630 | "length %lu", (unsigned long) igtk_elem_len); | |
631 | return -1; | |
632 | } | |
ff89afb7 JM |
633 | if (igtk_elem[8] != WPA_IGTK_LEN) { |
634 | wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length " | |
635 | "%d", igtk_elem[8]); | |
636 | return -1; | |
637 | } | |
638 | ||
639 | if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) { | |
b27f13ed JM |
640 | wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " |
641 | "decrypt IGTK"); | |
642 | return -1; | |
643 | } | |
644 | ||
ff89afb7 | 645 | /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */ |
b27f13ed JM |
646 | |
647 | keyidx = WPA_GET_LE16(igtk_elem); | |
648 | ||
649 | wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk, | |
650 | WPA_IGTK_LEN); | |
0382097e JM |
651 | if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0, |
652 | igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) { | |
b27f13ed JM |
653 | wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the " |
654 | "driver."); | |
655 | return -1; | |
656 | } | |
657 | ||
658 | return 0; | |
659 | } | |
660 | #endif /* CONFIG_IEEE80211W */ | |
661 | ||
662 | ||
6fc6879b | 663 | int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies, |
658d1662 | 664 | size_t ies_len, const u8 *src_addr) |
6fc6879b JM |
665 | { |
666 | struct wpa_ft_ies parse; | |
667 | struct rsn_mdie *mdie; | |
668 | struct rsn_ftie *ftie; | |
8aaf894d | 669 | unsigned int count; |
6fc6879b | 670 | u8 mic[16]; |
6fc6879b JM |
671 | |
672 | wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); | |
673 | ||
674 | if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && | |
675 | sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { | |
676 | wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " | |
677 | "enabled for this connection"); | |
678 | return -1; | |
679 | } | |
680 | ||
681 | if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { | |
682 | wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); | |
683 | return -1; | |
684 | } | |
685 | ||
686 | mdie = (struct rsn_mdie *) parse.mdie; | |
687 | if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || | |
688 | os_memcmp(mdie->mobility_domain, sm->mobility_domain, | |
689 | MOBILITY_DOMAIN_ID_LEN) != 0) { | |
690 | wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); | |
691 | return -1; | |
692 | } | |
693 | ||
694 | ftie = (struct rsn_ftie *) parse.ftie; | |
695 | if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { | |
696 | wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); | |
697 | return -1; | |
698 | } | |
699 | ||
148fb67d JM |
700 | if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { |
701 | wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); | |
702 | wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", | |
703 | ftie->snonce, WPA_NONCE_LEN); | |
704 | wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", | |
705 | sm->snonce, WPA_NONCE_LEN); | |
706 | return -1; | |
707 | } | |
708 | ||
709 | if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) { | |
710 | wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); | |
711 | wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", | |
712 | ftie->anonce, WPA_NONCE_LEN); | |
713 | wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", | |
714 | sm->anonce, WPA_NONCE_LEN); | |
715 | return -1; | |
716 | } | |
717 | ||
6fc6879b JM |
718 | if (parse.r0kh_id == NULL) { |
719 | wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); | |
720 | return -1; | |
721 | } | |
722 | ||
723 | if (parse.r0kh_id_len != sm->r0kh_id_len || | |
724 | os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { | |
725 | wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " | |
726 | "the current R0KH-ID"); | |
727 | wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", | |
728 | parse.r0kh_id, parse.r0kh_id_len); | |
729 | wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", | |
730 | sm->r0kh_id, sm->r0kh_id_len); | |
731 | return -1; | |
732 | } | |
733 | ||
734 | if (parse.r1kh_id == NULL) { | |
735 | wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); | |
736 | return -1; | |
737 | } | |
738 | ||
739 | if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) { | |
740 | wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " | |
741 | "ReassocResp"); | |
742 | return -1; | |
743 | } | |
744 | ||
745 | if (parse.rsn_pmkid == NULL || | |
746 | os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { | |
747 | wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " | |
748 | "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); | |
749 | return -1; | |
750 | } | |
751 | ||
752 | count = 3; | |
c284b461 HW |
753 | if (parse.ric) |
754 | count += ieee802_11_ie_count(parse.ric, parse.ric_len); | |
8aaf894d JM |
755 | if (ftie->mic_control[1] != count) { |
756 | wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " | |
757 | "Control: received %u expected %u", | |
758 | ftie->mic_control[1], count); | |
759 | return -1; | |
760 | } | |
6fc6879b | 761 | |
658d1662 | 762 | if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6, |
6fc6879b JM |
763 | parse.mdie - 2, parse.mdie_len + 2, |
764 | parse.ftie - 2, parse.ftie_len + 2, | |
f238cf9f JM |
765 | parse.rsn - 2, parse.rsn_len + 2, |
766 | parse.ric, parse.ric_len, | |
6fc6879b JM |
767 | mic) < 0) { |
768 | wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); | |
769 | return -1; | |
770 | } | |
771 | ||
772 | if (os_memcmp(mic, ftie->mic, 16) != 0) { | |
773 | wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); | |
774 | wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); | |
775 | wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); | |
776 | return -1; | |
777 | } | |
778 | ||
b27f13ed | 779 | if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0) |
6fc6879b | 780 | return -1; |
6fc6879b | 781 | |
b27f13ed JM |
782 | #ifdef CONFIG_IEEE80211W |
783 | if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0) | |
6fc6879b | 784 | return -1; |
b27f13ed | 785 | #endif /* CONFIG_IEEE80211W */ |
6fc6879b | 786 | |
86f7b62a JM |
787 | if (sm->set_ptk_after_assoc) { |
788 | wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we " | |
789 | "are associated"); | |
790 | if (wpa_ft_install_ptk(sm, src_addr) < 0) | |
791 | return -1; | |
792 | sm->set_ptk_after_assoc = 0; | |
793 | } | |
794 | ||
f238cf9f JM |
795 | if (parse.ric) { |
796 | wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response", | |
797 | parse.ric, parse.ric_len); | |
6a1ce395 DG |
798 | /* TODO: parse response and inform driver about results when |
799 | * using wpa_supplicant SME */ | |
f238cf9f JM |
800 | } |
801 | ||
6a1ce395 DG |
802 | wpa_printf(MSG_DEBUG, "FT: Completed successfully"); |
803 | ||
6fc6879b JM |
804 | return 0; |
805 | } | |
806 | ||
807 | ||
808 | /** | |
809 | * wpa_ft_start_over_ds - Generate over-the-DS auth request | |
810 | * @sm: Pointer to WPA state machine data from wpa_sm_init() | |
76b7981d JM |
811 | * @target_ap: Target AP Address |
812 | * @mdie: Mobility Domain IE from the target AP | |
6fc6879b JM |
813 | * Returns: 0 on success, -1 on failure |
814 | */ | |
76b7981d JM |
815 | int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap, |
816 | const u8 *mdie) | |
6fc6879b JM |
817 | { |
818 | u8 *ft_ies; | |
819 | size_t ft_ies_len; | |
820 | ||
821 | wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR, | |
822 | MAC2STR(target_ap)); | |
823 | ||
824 | /* Generate a new SNonce */ | |
3642c431 | 825 | if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { |
6fc6879b JM |
826 | wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); |
827 | return -1; | |
828 | } | |
829 | ||
830 | ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, | |
76b7981d | 831 | NULL, target_ap, NULL, 0, mdie); |
6fc6879b JM |
832 | if (ft_ies) { |
833 | sm->over_the_ds_in_progress = 1; | |
834 | os_memcpy(sm->target_ap, target_ap, ETH_ALEN); | |
835 | wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len); | |
836 | os_free(ft_ies); | |
837 | } | |
838 | ||
839 | return 0; | |
840 | } | |
841 | ||
842 | #endif /* CONFIG_IEEE80211R */ |