1 /*
2 * wpa_supplicant - WPA/RSN IE and KDE processing
3 * Copyright (c) 2003-2015, 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 if (wpa_ie_len >= 6 && wpa_ie[0] == WLAN_EID_VENDOR_SPECIFIC &&
34 wpa_ie[1] >= 4 && WPA_GET_BE32(&wpa_ie[2]) == OSEN_IE_VENDOR_TYPE)
35 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
36 else
37 return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
38 }
39
40
wpa_gen_wpa_ie_wpa(u8 * wpa_ie,size_t wpa_ie_len,int pairwise_cipher,int group_cipher,int key_mgmt)41 static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
42 int pairwise_cipher, int group_cipher,
43 int key_mgmt)
44 {
45 u8 *pos;
46 struct wpa_ie_hdr *hdr;
47 u32 suite;
48
49 if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
50 2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
51 return -1;
52
53 hdr = (struct wpa_ie_hdr *) wpa_ie;
54 hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
55 RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
56 WPA_PUT_LE16(hdr->version, WPA_VERSION);
57 pos = (u8 *) (hdr + 1);
58
59 suite = wpa_cipher_to_suite(WPA_PROTO_WPA, group_cipher);
60 if (suite == 0) {
61 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
62 group_cipher);
63 return -1;
64 }
65 RSN_SELECTOR_PUT(pos, suite);
66 pos += WPA_SELECTOR_LEN;
67
68 *pos++ = 1;
69 *pos++ = 0;
70 suite = wpa_cipher_to_suite(WPA_PROTO_WPA, pairwise_cipher);
71 if (suite == 0 ||
72 (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
73 pairwise_cipher != WPA_CIPHER_NONE)) {
74 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
75 pairwise_cipher);
76 return -1;
77 }
78 RSN_SELECTOR_PUT(pos, suite);
79 pos += WPA_SELECTOR_LEN;
80
81 *pos++ = 1;
82 *pos++ = 0;
83 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
84 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
85 } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
86 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
87 } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
88 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
89 } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
90 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_CCKM);
91 } else {
92 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
93 key_mgmt);
94 return -1;
95 }
96 pos += WPA_SELECTOR_LEN;
97
98 /* WPA Capabilities; use defaults, so no need to include it */
99
100 hdr->len = (pos - wpa_ie) - 2;
101
102 WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
103
104 return pos - wpa_ie;
105 }
106
107
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)108 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
109 int pairwise_cipher, int group_cipher,
110 int key_mgmt, int mgmt_group_cipher,
111 struct wpa_sm *sm)
112 {
113 u8 *pos;
114 struct rsn_ie_hdr *hdr;
115 u16 capab;
116 u32 suite;
117
118 if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
119 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
120 (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
121 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
122 (unsigned long) rsn_ie_len);
123 return -1;
124 }
125
126 hdr = (struct rsn_ie_hdr *) rsn_ie;
127 hdr->elem_id = WLAN_EID_RSN;
128 WPA_PUT_LE16(hdr->version, RSN_VERSION);
129 pos = (u8 *) (hdr + 1);
130
131 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
132 if (suite == 0) {
133 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
134 group_cipher);
135 return -1;
136 }
137 RSN_SELECTOR_PUT(pos, suite);
138 pos += RSN_SELECTOR_LEN;
139
140 *pos++ = 1;
141 *pos++ = 0;
142 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
143 if (suite == 0 ||
144 (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
145 pairwise_cipher != WPA_CIPHER_NONE)) {
146 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
147 pairwise_cipher);
148 return -1;
149 }
150 RSN_SELECTOR_PUT(pos, suite);
151 pos += RSN_SELECTOR_LEN;
152
153 *pos++ = 1;
154 *pos++ = 0;
155 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
156 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
157 } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
158 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
159 } else if (key_mgmt == WPA_KEY_MGMT_CCKM) {
160 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_CCKM);
161 #ifdef CONFIG_IEEE80211R
162 } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
163 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
164 } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
165 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
166 #endif /* CONFIG_IEEE80211R */
167 #ifdef CONFIG_IEEE80211W
168 } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
169 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
170 } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
171 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
172 #endif /* CONFIG_IEEE80211W */
173 #ifdef CONFIG_SAE
174 } else if (key_mgmt == WPA_KEY_MGMT_SAE) {
175 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_SAE);
176 } else if (key_mgmt == WPA_KEY_MGMT_FT_SAE) {
177 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE);
178 #endif /* CONFIG_SAE */
179 } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192) {
180 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B_192);
181 } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SUITE_B) {
182 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SUITE_B);
183 } else {
184 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
185 key_mgmt);
186 return -1;
187 }
188 pos += RSN_SELECTOR_LEN;
189
190 /* RSN Capabilities */
191 capab = 0;
192 #ifdef CONFIG_IEEE80211W
193 if (sm->mfp)
194 capab |= WPA_CAPABILITY_MFPC;
195 if (sm->mfp == 2)
196 capab |= WPA_CAPABILITY_MFPR;
197 #endif /* CONFIG_IEEE80211W */
198 WPA_PUT_LE16(pos, capab);
199 pos += 2;
200
201 if (sm->cur_pmksa) {
202 /* PMKID Count (2 octets, little endian) */
203 *pos++ = 1;
204 *pos++ = 0;
205 /* PMKID */
206 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
207 pos += PMKID_LEN;
208 }
209
210 #ifdef CONFIG_IEEE80211W
211 if (wpa_cipher_valid_mgmt_group(mgmt_group_cipher)) {
212 if (!sm->cur_pmksa) {
213 /* PMKID Count */
214 WPA_PUT_LE16(pos, 0);
215 pos += 2;
216 }
217
218 /* Management Group Cipher Suite */
219 RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN,
220 mgmt_group_cipher));
221 pos += RSN_SELECTOR_LEN;
222 }
223 #endif /* CONFIG_IEEE80211W */
224
225 hdr->len = (pos - rsn_ie) - 2;
226
227 WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
228
229 return pos - rsn_ie;
230 }
231
232
233 #ifdef CONFIG_HS20
wpa_gen_wpa_ie_osen(u8 * wpa_ie,size_t wpa_ie_len,int pairwise_cipher,int group_cipher,int key_mgmt)234 static int wpa_gen_wpa_ie_osen(u8 *wpa_ie, size_t wpa_ie_len,
235 int pairwise_cipher, int group_cipher,
236 int key_mgmt)
237 {
238 u8 *pos, *len;
239 u32 suite;
240
241 if (wpa_ie_len < 2 + 4 + RSN_SELECTOR_LEN +
242 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN)
243 return -1;
244
245 pos = wpa_ie;
246 *pos++ = WLAN_EID_VENDOR_SPECIFIC;
247 len = pos++; /* to be filled */
248 WPA_PUT_BE24(pos, OUI_WFA);
249 pos += 3;
250 *pos++ = HS20_OSEN_OUI_TYPE;
251
252 /* Group Data Cipher Suite */
253 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, group_cipher);
254 if (suite == 0) {
255 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
256 group_cipher);
257 return -1;
258 }
259 RSN_SELECTOR_PUT(pos, suite);
260 pos += RSN_SELECTOR_LEN;
261
262 /* Pairwise Cipher Suite Count and List */
263 WPA_PUT_LE16(pos, 1);
264 pos += 2;
265 suite = wpa_cipher_to_suite(WPA_PROTO_RSN, pairwise_cipher);
266 if (suite == 0 ||
267 (!wpa_cipher_valid_pairwise(pairwise_cipher) &&
268 pairwise_cipher != WPA_CIPHER_NONE)) {
269 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
270 pairwise_cipher);
271 return -1;
272 }
273 RSN_SELECTOR_PUT(pos, suite);
274 pos += RSN_SELECTOR_LEN;
275
276 /* AKM Suite Count and List */
277 WPA_PUT_LE16(pos, 1);
278 pos += 2;
279 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_OSEN);
280 pos += RSN_SELECTOR_LEN;
281
282 *len = pos - len - 1;
283
284 WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
285
286 return pos - wpa_ie;
287 }
288 #endif /* CONFIG_HS20 */
289
290
291 /**
292 * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
293 * @sm: Pointer to WPA state machine data from wpa_sm_init()
294 * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
295 * @wpa_ie_len: Maximum length of the generated WPA/RSN IE
296 * Returns: Length of the generated WPA/RSN IE or -1 on failure
297 */
wpa_gen_wpa_ie(struct wpa_sm * sm,u8 * wpa_ie,size_t wpa_ie_len)298 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
299 {
300 if (sm->proto == WPA_PROTO_RSN)
301 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
302 sm->pairwise_cipher,
303 sm->group_cipher,
304 sm->key_mgmt, sm->mgmt_group_cipher,
305 sm);
306 #ifdef CONFIG_HS20
307 else if (sm->proto == WPA_PROTO_OSEN)
308 return wpa_gen_wpa_ie_osen(wpa_ie, wpa_ie_len,
309 sm->pairwise_cipher,
310 sm->group_cipher,
311 sm->key_mgmt);
312 #endif /* CONFIG_HS20 */
313 else
314 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
315 sm->pairwise_cipher,
316 sm->group_cipher,
317 sm->key_mgmt);
318 }
319
320
321 /**
322 * wpa_parse_vendor_specific - Parse Vendor Specific IEs
323 * @pos: Pointer to the IE header
324 * @end: Pointer to the end of the Key Data buffer
325 * @ie: Pointer to parsed IE data
326 * Returns: 0 on success, 1 if end mark is found, -1 on failure
327 */
wpa_parse_vendor_specific(const u8 * pos,const u8 * end,struct wpa_eapol_ie_parse * ie)328 static int wpa_parse_vendor_specific(const u8 *pos, const u8 *end,
329 struct wpa_eapol_ie_parse *ie)
330 {
331 unsigned int oui;
332
333 if (pos[1] < 4) {
334 wpa_printf(MSG_MSGDUMP, "Too short vendor specific IE ignored (len=%u)",
335 pos[1]);
336 return 1;
337 }
338
339 oui = WPA_GET_BE24(&pos[2]);
340 if (oui == OUI_MICROSOFT && pos[5] == WMM_OUI_TYPE && pos[1] > 4) {
341 if (pos[6] == WMM_OUI_SUBTYPE_INFORMATION_ELEMENT) {
342 ie->wmm = &pos[2];
343 ie->wmm_len = pos[1];
344 wpa_hexdump(MSG_DEBUG, "WPA: WMM IE",
345 ie->wmm, ie->wmm_len);
346 } else if (pos[6] == WMM_OUI_SUBTYPE_PARAMETER_ELEMENT) {
347 ie->wmm = &pos[2];
348 ie->wmm_len = pos[1];
349 wpa_hexdump(MSG_DEBUG, "WPA: WMM Parameter Element",
350 ie->wmm, ie->wmm_len);
351 }
352 }
353 return 0;
354 }
355
356
357 /**
358 * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
359 * @pos: Pointer to the IE header
360 * @end: Pointer to the end of the Key Data buffer
361 * @ie: Pointer to parsed IE data
362 * Returns: 0 on success, 1 if end mark is found, -1 on failure
363 */
wpa_parse_generic(const u8 * pos,const u8 * end,struct wpa_eapol_ie_parse * ie)364 static int wpa_parse_generic(const u8 *pos, const u8 *end,
365 struct wpa_eapol_ie_parse *ie)
366 {
367 if (pos[1] == 0)
368 return 1;
369
370 if (pos[1] >= 6 &&
371 RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
372 pos[2 + WPA_SELECTOR_LEN] == 1 &&
373 pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
374 ie->wpa_ie = pos;
375 ie->wpa_ie_len = pos[1] + 2;
376 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key",
377 ie->wpa_ie, ie->wpa_ie_len);
378 return 0;
379 }
380
381 if (pos + 1 + RSN_SELECTOR_LEN < end &&
382 pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
383 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
384 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
385 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key",
386 pos, pos[1] + 2);
387 return 0;
388 }
389
390 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
391 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
392 ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
393 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
394 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key",
395 pos, pos[1] + 2);
396 return 0;
397 }
398
399 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
400 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
401 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
402 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
403 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key",
404 pos, pos[1] + 2);
405 return 0;
406 }
407
408 #ifdef CONFIG_PEERKEY
409 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
410 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) {
411 ie->smk = pos + 2 + RSN_SELECTOR_LEN;
412 ie->smk_len = pos[1] - RSN_SELECTOR_LEN;
413 wpa_hexdump_key(MSG_DEBUG, "WPA: SMK in EAPOL-Key",
414 pos, pos[1] + 2);
415 return 0;
416 }
417
418 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
419 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) {
420 ie->nonce = pos + 2 + RSN_SELECTOR_LEN;
421 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN;
422 wpa_hexdump(MSG_DEBUG, "WPA: Nonce in EAPOL-Key",
423 pos, pos[1] + 2);
424 return 0;
425 }
426
427 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
428 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) {
429 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN;
430 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN;
431 wpa_hexdump(MSG_DEBUG, "WPA: Lifetime in EAPOL-Key",
432 pos, pos[1] + 2);
433 return 0;
434 }
435
436 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
437 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) {
438 ie->error = pos + 2 + RSN_SELECTOR_LEN;
439 ie->error_len = pos[1] - RSN_SELECTOR_LEN;
440 wpa_hexdump(MSG_DEBUG, "WPA: Error in EAPOL-Key",
441 pos, pos[1] + 2);
442 return 0;
443 }
444 #endif /* CONFIG_PEERKEY */
445
446 #ifdef CONFIG_IEEE80211W
447 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
448 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
449 ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
450 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
451 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key",
452 pos, pos[1] + 2);
453 return 0;
454 }
455 #endif /* CONFIG_IEEE80211W */
456
457 #ifdef CONFIG_P2P
458 if (pos[1] >= RSN_SELECTOR_LEN + 1 &&
459 RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_REQ) {
460 ie->ip_addr_req = pos + 2 + RSN_SELECTOR_LEN;
461 wpa_hexdump(MSG_DEBUG, "WPA: IP Address Request in EAPOL-Key",
462 ie->ip_addr_req, pos[1] - RSN_SELECTOR_LEN);
463 return 0;
464 }
465
466 if (pos[1] >= RSN_SELECTOR_LEN + 3 * 4 &&
467 RSN_SELECTOR_GET(pos + 2) == WFA_KEY_DATA_IP_ADDR_ALLOC) {
468 ie->ip_addr_alloc = pos + 2 + RSN_SELECTOR_LEN;
469 wpa_hexdump(MSG_DEBUG,
470 "WPA: IP Address Allocation in EAPOL-Key",
471 ie->ip_addr_alloc, pos[1] - RSN_SELECTOR_LEN);
472 return 0;
473 }
474 #endif /* CONFIG_P2P */
475
476 return 0;
477 }
478
479
480 /**
481 * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
482 * @buf: Pointer to the Key Data buffer
483 * @len: Key Data Length
484 * @ie: Pointer to parsed IE data
485 * Returns: 0 on success, -1 on failure
486 */
wpa_supplicant_parse_ies(const u8 * buf,size_t len,struct wpa_eapol_ie_parse * ie)487 int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
488 struct wpa_eapol_ie_parse *ie)
489 {
490 const u8 *pos, *end;
491 int ret = 0;
492
493 os_memset(ie, 0, sizeof(*ie));
494 for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) {
495 if (pos[0] == 0xdd &&
496 ((pos == buf + len - 1) || pos[1] == 0)) {
497 /* Ignore padding */
498 break;
499 }
500 if (pos + 2 + pos[1] > end) {
501 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
502 "underflow (ie=%d len=%d pos=%d)",
503 pos[0], pos[1], (int) (pos - buf));
504 wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data",
505 buf, len);
506 ret = -1;
507 break;
508 }
509 if (*pos == WLAN_EID_RSN) {
510 ie->rsn_ie = pos;
511 ie->rsn_ie_len = pos[1] + 2;
512 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key",
513 ie->rsn_ie, ie->rsn_ie_len);
514 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN &&
515 pos[1] >= sizeof(struct rsn_mdie)) {
516 ie->mdie = pos;
517 ie->mdie_len = pos[1] + 2;
518 wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key",
519 ie->mdie, ie->mdie_len);
520 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION &&
521 pos[1] >= sizeof(struct rsn_ftie)) {
522 ie->ftie = pos;
523 ie->ftie_len = pos[1] + 2;
524 wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key",
525 ie->ftie, ie->ftie_len);
526 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) {
527 if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) {
528 ie->reassoc_deadline = pos;
529 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline "
530 "in EAPOL-Key",
531 ie->reassoc_deadline, pos[1] + 2);
532 } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) {
533 ie->key_lifetime = pos;
534 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime "
535 "in EAPOL-Key",
536 ie->key_lifetime, pos[1] + 2);
537 } else {
538 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized "
539 "EAPOL-Key Key Data IE",
540 pos, 2 + pos[1]);
541 }
542 } else if (*pos == WLAN_EID_LINK_ID) {
543 if (pos[1] >= 18) {
544 ie->lnkid = pos;
545 ie->lnkid_len = pos[1] + 2;
546 }
547 } else if (*pos == WLAN_EID_EXT_CAPAB) {
548 ie->ext_capab = pos;
549 ie->ext_capab_len = pos[1] + 2;
550 } else if (*pos == WLAN_EID_SUPP_RATES) {
551 ie->supp_rates = pos;
552 ie->supp_rates_len = pos[1] + 2;
553 } else if (*pos == WLAN_EID_EXT_SUPP_RATES) {
554 ie->ext_supp_rates = pos;
555 ie->ext_supp_rates_len = pos[1] + 2;
556 } else if (*pos == WLAN_EID_HT_CAP &&
557 pos[1] >= sizeof(struct ieee80211_ht_capabilities)) {
558 ie->ht_capabilities = pos + 2;
559 } else if (*pos == WLAN_EID_VHT_AID) {
560 if (pos[1] >= 2)
561 ie->aid = WPA_GET_LE16(pos + 2) & 0x3fff;
562 } else if (*pos == WLAN_EID_VHT_CAP &&
563 pos[1] >= sizeof(struct ieee80211_vht_capabilities))
564 {
565 ie->vht_capabilities = pos + 2;
566 } else if (*pos == WLAN_EID_QOS && pos[1] >= 1) {
567 ie->qosinfo = pos[2];
568 } else if (*pos == WLAN_EID_SUPPORTED_CHANNELS) {
569 ie->supp_channels = pos + 2;
570 ie->supp_channels_len = pos[1];
571 } else if (*pos == WLAN_EID_SUPPORTED_OPERATING_CLASSES) {
572 /*
573 * The value of the Length field of the Supported
574 * Operating Classes element is between 2 and 253.
575 * Silently skip invalid elements to avoid interop
576 * issues when trying to use the value.
577 */
578 if (pos[1] >= 2 && pos[1] <= 253) {
579 ie->supp_oper_classes = pos + 2;
580 ie->supp_oper_classes_len = pos[1];
581 }
582 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
583 ret = wpa_parse_generic(pos, end, ie);
584 if (ret < 0)
585 break;
586 if (ret > 0) {
587 ret = 0;
588 break;
589 }
590
591 ret = wpa_parse_vendor_specific(pos, end, ie);
592 if (ret < 0)
593 break;
594 if (ret > 0) {
595 ret = 0;
596 break;
597 }
598 } else {
599 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
600 "Key Data IE", pos, 2 + pos[1]);
601 }
602 }
603
604 return ret;
605 }
606