1 /*
2 * wpa_supplicant - WPA/RSN IE and KDE processing
3 * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "wpa.h"
13 #include "pmksa_cache.h"
14 #include "common/ieee802_11_defs.h"
15 #include "wpa_i.h"
16 #include "wpa_ie.h"
17
18
19 /**
20 * wpa_parse_wpa_ie - Parse WPA/RSN IE
21 * @wpa_ie: Pointer to WPA or RSN IE
22 * @wpa_ie_len: Length of the WPA/RSN IE
23 * @data: Pointer to data area for parsing results
24 * Returns: 0 on success, -1 on failure
25 *
26 * Parse the contents of WPA or RSN IE and write the parsed data into data.
27 */
wpa_parse_wpa_ie(const u8 * wpa_ie,size_t wpa_ie_len,struct wpa_ie_data * data)28 int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len,
29 struct wpa_ie_data *data)
30 {
31 if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN)
32 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
33 else
34 return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
35 }
36
37
wpa_gen_wpa_ie_wpa(u8 * wpa_ie,size_t wpa_ie_len,int pairwise_cipher,int group_cipher,int key_mgmt)38 static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
39 int pairwise_cipher, int group_cipher,
40 int key_mgmt)
41 {
42 u8 *pos;
43 struct wpa_ie_hdr *hdr;
44 u32 suite;
45
46 if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
47 2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
48 return -1;
49
50 hdr = (struct wpa_ie_hdr *) wpa_ie;
51 hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
52 RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
53 WPA_PUT_LE16(hdr->version, WPA_VERSION);
54 pos = (u8 *) (hdr + 1);
55
56 suite = wpa_cipher_to_suite(WPA_PROTO_WPA, group_cipher);
57 if (suite == 0) {
58 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
59 group_cipher);
60 return -1;
61 }
62 RSN_SELECTOR_PUT(pos, suite);
63 pos += WPA_SELECTOR_LEN;
64
65 *pos++ = 1;
66 *pos++ = 0;
67 suite = wpa_cipher_to_suite(WPA_PROTO_WPA, pairwise_cipher);
68 if (suite == 0 ||
69 (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
70 pairwise_cipher != WPA_CIPHER_NONE)) {
71 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
72 pairwise_cipher);
73 return -1;
74 }
75 RSN_SELECTOR_PUT(pos, suite);
76 pos += WPA_SELECTOR_LEN;
77
78 *pos++ = 1;
79 *pos++ = 0;
80 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
81 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
82 } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
83 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
84 } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
85 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
86 } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
87 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_CCKM);
88 } else {
89 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
90 key_mgmt);
91 return -1;
92 }
93 pos += WPA_SELECTOR_LEN;
94
95 /* WPA Capabilities; use defaults, so no need to include it */
96
97 hdr->len = (pos - wpa_ie) - 2;
98
99 WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
100
101 return pos - wpa_ie;
102 }
103
104
wpa_gen_wpa_ie_rsn(u8 * rsn_ie,size_t rsn_ie_len,int pairwise_cipher,int group_cipher,int key_mgmt,int mgmt_group_cipher,struct wpa_sm * sm)105 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
106 int pairwise_cipher, int group_cipher,
107 int key_mgmt, int mgmt_group_cipher,
108 struct wpa_sm *sm)
109 {
110 #ifndef CONFIG_NO_WPA2
111 u8 *pos;
112 struct rsn_ie_hdr *hdr;
113 u16 capab;
114 u32 suite;
115
116 if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
117 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
118 (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
119 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
120 (unsigned long) rsn_ie_len);
121 return -1;
122 }
123
124 hdr = (struct rsn_ie_hdr *) rsn_ie;
125 hdr->elem_id = WLAN_EID_RSN;
126 WPA_PUT_LE16(hdr->version, RSN_VERSION);
127 pos = (u8 *) (hdr + 1);
128
129 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
130 if (suite == 0) {
131 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
132 group_cipher);
133 return -1;
134 }
135 RSN_SELECTOR_PUT(pos, suite);
136 pos += RSN_SELECTOR_LEN;
137
138 *pos++ = 1;
139 *pos++ = 0;
140 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
141 if (suite == 0 ||
142 (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
143 pairwise_cipher != WPA_CIPHER_NONE)) {
144 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
145 pairwise_cipher);
146 return -1;
147 }
148 RSN_SELECTOR_PUT(pos, suite);
149 pos += RSN_SELECTOR_LEN;
150
151 *pos++ = 1;
152 *pos++ = 0;
153 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
154 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
155 } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
156 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
157 } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
158 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_CCKM);
159 #ifdef CONFIG_IEEE80211R
160 } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
161 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
162 } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
163 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
164 #endif /* CONFIG_IEEE80211R */
165 #ifdef CONFIG_IEEE80211W
166 } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
167 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
168 } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
169 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
170 #endif /* CONFIG_IEEE80211W */
171 #ifdef CONFIG_SAE
172 } else if (key_mgmt == WPA_KEY_MGMT_SAE) {
173 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE);
174 } else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) {
175 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
176 #endif /* CONFIG_SAE */
177 } else {
178 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
179 key_mgmt);
180 return -1;
181 }
182 pos += RSN_SELECTOR_LEN;
183
184 /* RSN Capabilities */
185 capab = 0;
186 #ifdef CONFIG_IEEE80211W
187 if (sm->mfp)
188 capab |= WPA_CAPABILITY_MFPC;
189 if (sm->mfp == 2)
190 capab |= WPA_CAPABILITY_MFPR;
191 #endif /* CONFIG_IEEE80211W */
192 WPA_PUT_LE16(pos, capab);
193 pos += 2;
194
195 if (sm->cur_pmksa) {
196 /* PMKID Count (2 octets, little endian) */
197 *pos++ = 1;
198 *pos++ = 0;
199 /* PMKID */
200 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
201 pos += PMKID_LEN;
202 }
203
204 #ifdef CONFIG_IEEE80211W
205 if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
206 if (!sm->cur_pmksa) {
207 /* PMKID Count */
208 WPA_PUT_LE16(pos, 0);
209 pos += 2;
210 }
211
212 /* Management Group Cipher Suite */
213 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
214 pos += RSN_SELECTOR_LEN;
215 }
216 #endif /* CONFIG_IEEE80211W */
217
218 hdr->len = (pos - rsn_ie) - 2;
219
220 WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
221
222 return pos - rsn_ie;
223 #else /* CONFIG_NO_WPA2 */
224 return -1;
225 #endif /* CONFIG_NO_WPA2 */
226 }
227
228
229 /**
230 * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
231 * @sm: Pointer to WPA state machine data from wpa_sm_init()
232 * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
233 * @wpa_ie_len: Maximum length of the generated WPA/RSN IE
234 * Returns: Length of the generated WPA/RSN IE or -1 on failure
235 */
wpa_gen_wpa_ie(struct wpa_sm * sm,u8 * wpa_ie,size_t wpa_ie_len)236 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
237 {
238 if (sm->proto == WPA_PROTO_RSN)
239 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
240 sm->pairwise_cipher,
241 sm->group_cipher,
242 sm->key_mgmt, sm->mgmt_group_cipher,
243 sm);
244 else
245 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
246 sm->pairwise_cipher,
247 sm->group_cipher,
248 sm->key_mgmt);
249 }
250
251
252 /**
253 * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
254 * @pos: Pointer to the IE header
255 * @end: Pointer to the end of the Key Data buffer
256 * @ie: Pointer to parsed IE data
257 * Returns: 0 on success, 1 if end mark is found, -1 on failure
258 */
wpa_parse_generic(const u8 * pos,const u8 * end,struct wpa_eapol_ie_parse * ie)259 static int wpa_parse_generic(const u8 *pos, const u8 *end,
260 struct wpa_eapol_ie_parse *ie)
261 {
262 if (pos[1] == 0)
263 return 1;
264
265 if (pos[1] >= 6 &&
266 RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
267 pos[2 + WPA_SELECTOR_LEN] == 1 &&
268 pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
269 ie->wpa_ie = pos;
270 ie->wpa_ie_len = pos[1] + 2;
271 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key",
272 ie->wpa_ie, ie->wpa_ie_len);
273 return 0;
274 }
275
276 if (pos + 1 + RSN_SELECTOR_LEN < end &&
277 pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
278 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
279 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
280 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key",
281 pos, pos[1] + 2);
282 return 0;
283 }
284
285 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
286 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
287 ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
288 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
289 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key",
290 pos, pos[1] + 2);
291 return 0;
292 }
293
294 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
295 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
296 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
297 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
298 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key",
299 pos, pos[1] + 2);
300 return 0;
301 }
302
303 #ifdef CONFIG_PEERKEY
304 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
305 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) {
306 ie->smk = pos + 2 + RSN_SELECTOR_LEN;
307 ie->smk_len = pos[1] - RSN_SELECTOR_LEN;
308 wpa_hexdump_key(MSG_DEBUG, "WPA: SMK in EAPOL-Key",
309 pos, pos[1] + 2);
310 return 0;
311 }
312
313 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
314 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) {
315 ie->nonce = pos + 2 + RSN_SELECTOR_LEN;
316 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN;
317 wpa_hexdump(MSG_DEBUG, "WPA: Nonce in EAPOL-Key",
318 pos, pos[1] + 2);
319 return 0;
320 }
321
322 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
323 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) {
324 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN;
325 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN;
326 wpa_hexdump(MSG_DEBUG, "WPA: Lifetime in EAPOL-Key",
327 pos, pos[1] + 2);
328 return 0;
329 }
330
331 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
332 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) {
333 ie->error = pos + 2 + RSN_SELECTOR_LEN;
334 ie->error_len = pos[1] - RSN_SELECTOR_LEN;
335 wpa_hexdump(MSG_DEBUG, "WPA: Error in EAPOL-Key",
336 pos, pos[1] + 2);
337 return 0;
338 }
339 #endif /* CONFIG_PEERKEY */
340
341 #ifdef CONFIG_IEEE80211W
342 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
343 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
344 ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
345 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
346 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key",
347 pos, pos[1] + 2);
348 return 0;
349 }
350 #endif /* CONFIG_IEEE80211W */
351
352 return 0;
353 }
354
355
356 /**
357 * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
358 * @buf: Pointer to the Key Data buffer
359 * @len: Key Data Length
360 * @ie: Pointer to parsed IE data
361 * Returns: 0 on success, -1 on failure
362 */
wpa_supplicant_parse_ies(const u8 * buf,size_t len,struct wpa_eapol_ie_parse * ie)363 int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
364 struct wpa_eapol_ie_parse *ie)
365 {
366 const u8 *pos, *end;
367 int ret = 0;
368
369 os_memset(ie, 0, sizeof(*ie));
370 for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) {
371 if (pos[0] == 0xdd &&
372 ((pos == buf + len - 1) || pos[1] == 0)) {
373 /* Ignore padding */
374 break;
375 }
376 if (pos + 2 + pos[1] > end) {
377 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
378 "underflow (ie=%d len=%d pos=%d)",
379 pos[0], pos[1], (int) (pos - buf));
380 wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data",
381 buf, len);
382 ret = -1;
383 break;
384 }
385 if (*pos == WLAN_EID_RSN) {
386 ie->rsn_ie = pos;
387 ie->rsn_ie_len = pos[1] + 2;
388 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key",
389 ie->rsn_ie, ie->rsn_ie_len);
390 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN) {
391 ie->mdie = pos;
392 ie->mdie_len = pos[1] + 2;
393 wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key",
394 ie->mdie, ie->mdie_len);
395 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION) {
396 ie->ftie = pos;
397 ie->ftie_len = pos[1] + 2;
398 wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key",
399 ie->ftie, ie->ftie_len);
400 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) {
401 if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) {
402 ie->reassoc_deadline = pos;
403 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline "
404 "in EAPOL-Key",
405 ie->reassoc_deadline, pos[1] + 2);
406 } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) {
407 ie->key_lifetime = pos;
408 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime "
409 "in EAPOL-Key",
410 ie->key_lifetime, pos[1] + 2);
411 } else {
412 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized "
413 "EAPOL-Key Key Data IE",
414 pos, 2 + pos[1]);
415 }
416 } else if (*pos == WLAN_EID_LINK_ID) {
417 if (pos[1] >= 18) {
418 ie->lnkid = pos;
419 ie->lnkid_len = pos[1] + 2;
420 }
421 } else if (*pos == WLAN_EID_EXT_CAPAB) {
422 ie->ext_capab = pos;
423 ie->ext_capab_len = pos[1] + 2;
424 } else if (*pos == WLAN_EID_SUPP_RATES) {
425 ie->supp_rates = pos;
426 ie->supp_rates_len = pos[1] + 2;
427 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) {
428 ie->ext_supp_rates = pos;
429 ie->ext_supp_rates_len = pos[1] + 2;
430 } else if (*pos == WLAN_EID_HT_CAP) {
431 ie->ht_capabilities = pos + 2;
432 ie->ht_capabilities_len = pos[1];
433 } else if (*pos == WLAN_EID_VHT_CAP) {
434 ie->vht_capabilities = pos + 2;
435 ie->vht_capabilities_len = pos[1];
436 } else if (*pos == WLAN_EID_QOS && pos[1] >= 1) {
437 ie->qosinfo = pos[2];
438 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
439 ret = wpa_parse_generic(pos, end, ie);
440 if (ret < 0)
441 break;
442 if (ret > 0) {
443 ret = 0;
444 break;
445 }
446 } else {
447 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
448 "Key Data IE", pos, 2 + pos[1]);
449 }
450 }
451
452 return ret;
453 }
454