2 * wpa_supplicant - WPA/RSN IE and KDE processing
3 * Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
19 #include "pmksa_cache.h"
20 #include "common/ieee802_11_defs.h"
25 static int wpa_selector_to_bitfield(const u8 *s)
27 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_NONE)
28 return WPA_CIPHER_NONE;
29 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP40)
30 return WPA_CIPHER_WEP40;
31 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_TKIP)
32 return WPA_CIPHER_TKIP;
33 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_CCMP)
34 return WPA_CIPHER_CCMP;
35 if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP104)
36 return WPA_CIPHER_WEP104;
41 static int wpa_key_mgmt_to_bitfield(const u8 *s)
43 if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_UNSPEC_802_1X)
44 return WPA_KEY_MGMT_IEEE8021X;
45 if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X)
46 return WPA_KEY_MGMT_PSK;
47 if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_NONE)
48 return WPA_KEY_MGMT_WPA_NONE;
53 static int wpa_parse_wpa_ie_wpa(const u8 *wpa_ie, size_t wpa_ie_len,
54 struct wpa_ie_data *data)
56 const struct wpa_ie_hdr *hdr;
61 os_memset(data, 0, sizeof(*data));
62 data->proto = WPA_PROTO_WPA;
63 data->pairwise_cipher = WPA_CIPHER_TKIP;
64 data->group_cipher = WPA_CIPHER_TKIP;
65 data->key_mgmt = WPA_KEY_MGMT_IEEE8021X;
66 data->capabilities = 0;
69 data->mgmt_group_cipher = 0;
71 if (wpa_ie_len == 0) {
72 /* No WPA IE - fail silently */
76 if (wpa_ie_len < sizeof(struct wpa_ie_hdr)) {
77 wpa_printf(MSG_DEBUG, "%s: ie len too short %lu",
78 __func__, (unsigned long) wpa_ie_len);
82 hdr = (const struct wpa_ie_hdr *) wpa_ie;
84 if (hdr->elem_id != WLAN_EID_VENDOR_SPECIFIC ||
85 hdr->len != wpa_ie_len - 2 ||
86 RSN_SELECTOR_GET(hdr->oui) != WPA_OUI_TYPE ||
87 WPA_GET_LE16(hdr->version) != WPA_VERSION) {
88 wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version",
93 pos = (const u8 *) (hdr + 1);
94 left = wpa_ie_len - sizeof(*hdr);
96 if (left >= WPA_SELECTOR_LEN) {
97 data->group_cipher = wpa_selector_to_bitfield(pos);
98 pos += WPA_SELECTOR_LEN;
99 left -= WPA_SELECTOR_LEN;
100 } else if (left > 0) {
101 wpa_printf(MSG_DEBUG, "%s: ie length mismatch, %u too much",
107 data->pairwise_cipher = 0;
108 count = WPA_GET_LE16(pos);
111 if (count == 0 || left < count * WPA_SELECTOR_LEN) {
112 wpa_printf(MSG_DEBUG, "%s: ie count botch (pairwise), "
113 "count %u left %u", __func__, count, left);
116 for (i = 0; i < count; i++) {
117 data->pairwise_cipher |= wpa_selector_to_bitfield(pos);
118 pos += WPA_SELECTOR_LEN;
119 left -= WPA_SELECTOR_LEN;
121 } else if (left == 1) {
122 wpa_printf(MSG_DEBUG, "%s: ie too short (for key mgmt)",
129 count = WPA_GET_LE16(pos);
132 if (count == 0 || left < count * WPA_SELECTOR_LEN) {
133 wpa_printf(MSG_DEBUG, "%s: ie count botch (key mgmt), "
134 "count %u left %u", __func__, count, left);
137 for (i = 0; i < count; i++) {
138 data->key_mgmt |= wpa_key_mgmt_to_bitfield(pos);
139 pos += WPA_SELECTOR_LEN;
140 left -= WPA_SELECTOR_LEN;
142 } else if (left == 1) {
143 wpa_printf(MSG_DEBUG, "%s: ie too short (for capabilities)",
149 data->capabilities = WPA_GET_LE16(pos);
155 wpa_printf(MSG_DEBUG, "%s: ie has %u trailing bytes - ignored",
164 * wpa_parse_wpa_ie - Parse WPA/RSN IE
165 * @wpa_ie: Pointer to WPA or RSN IE
166 * @wpa_ie_len: Length of the WPA/RSN IE
167 * @data: Pointer to data area for parsing results
168 * Returns: 0 on success, -1 on failure
170 * Parse the contents of WPA or RSN IE and write the parsed data into data.
172 int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len,
173 struct wpa_ie_data *data)
175 if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN)
176 return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
178 return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
182 static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
183 int pairwise_cipher, int group_cipher,
187 struct wpa_ie_hdr *hdr;
189 if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
190 2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
193 hdr = (struct wpa_ie_hdr *) wpa_ie;
194 hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
195 RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
196 WPA_PUT_LE16(hdr->version, WPA_VERSION);
197 pos = (u8 *) (hdr + 1);
199 if (group_cipher == WPA_CIPHER_CCMP) {
200 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP);
201 } else if (group_cipher == WPA_CIPHER_TKIP) {
202 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP);
203 } else if (group_cipher == WPA_CIPHER_WEP104) {
204 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP104);
205 } else if (group_cipher == WPA_CIPHER_WEP40) {
206 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP40);
208 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
212 pos += WPA_SELECTOR_LEN;
216 if (pairwise_cipher == WPA_CIPHER_CCMP) {
217 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP);
218 } else if (pairwise_cipher == WPA_CIPHER_TKIP) {
219 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP);
220 } else if (pairwise_cipher == WPA_CIPHER_NONE) {
221 RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_NONE);
223 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
227 pos += WPA_SELECTOR_LEN;
231 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
232 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
233 } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
234 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
235 } else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
236 RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
238 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
242 pos += WPA_SELECTOR_LEN;
244 /* WPA Capabilities; use defaults, so no need to include it */
246 hdr->len = (pos - wpa_ie) - 2;
248 WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
254 static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
255 int pairwise_cipher, int group_cipher,
256 int key_mgmt, int mgmt_group_cipher,
259 #ifndef CONFIG_NO_WPA2
261 struct rsn_ie_hdr *hdr;
264 if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
265 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
266 (sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
267 wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
268 (unsigned long) rsn_ie_len);
272 hdr = (struct rsn_ie_hdr *) rsn_ie;
273 hdr->elem_id = WLAN_EID_RSN;
274 WPA_PUT_LE16(hdr->version, RSN_VERSION);
275 pos = (u8 *) (hdr + 1);
277 if (group_cipher == WPA_CIPHER_CCMP) {
278 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
279 } else if (group_cipher == WPA_CIPHER_TKIP) {
280 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
281 } else if (group_cipher == WPA_CIPHER_WEP104) {
282 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP104);
283 } else if (group_cipher == WPA_CIPHER_WEP40) {
284 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP40);
286 wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
290 pos += RSN_SELECTOR_LEN;
294 if (pairwise_cipher == WPA_CIPHER_CCMP) {
295 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
296 } else if (pairwise_cipher == WPA_CIPHER_TKIP) {
297 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
298 } else if (pairwise_cipher == WPA_CIPHER_NONE) {
299 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NONE);
301 wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
305 pos += RSN_SELECTOR_LEN;
309 if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
310 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
311 } else if (key_mgmt == WPA_KEY_MGMT_PSK) {
312 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
313 #ifdef CONFIG_IEEE80211R
314 } else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
315 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
316 } else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
317 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
318 #endif /* CONFIG_IEEE80211R */
319 #ifdef CONFIG_IEEE80211W
320 } else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
321 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
322 } else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
323 RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
324 #endif /* CONFIG_IEEE80211W */
326 wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
330 pos += RSN_SELECTOR_LEN;
332 /* RSN Capabilities */
334 #ifdef CONFIG_IEEE80211W
336 capab |= WPA_CAPABILITY_MFPC;
338 capab |= WPA_CAPABILITY_MFPR;
339 #endif /* CONFIG_IEEE80211W */
340 WPA_PUT_LE16(pos, capab);
344 /* PMKID Count (2 octets, little endian) */
348 os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
352 #ifdef CONFIG_IEEE80211W
353 if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
354 if (!sm->cur_pmksa) {
356 WPA_PUT_LE16(pos, 0);
360 /* Management Group Cipher Suite */
361 RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
362 pos += RSN_SELECTOR_LEN;
364 #endif /* CONFIG_IEEE80211W */
366 hdr->len = (pos - rsn_ie) - 2;
368 WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
371 #else /* CONFIG_NO_WPA2 */
373 #endif /* CONFIG_NO_WPA2 */
378 * wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
379 * @sm: Pointer to WPA state machine data from wpa_sm_init()
380 * @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
381 * @wpa_ie_len: Maximum length of the generated WPA/RSN IE
382 * Returns: Length of the generated WPA/RSN IE or -1 on failure
384 int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
386 if (sm->proto == WPA_PROTO_RSN)
387 return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
390 sm->key_mgmt, sm->mgmt_group_cipher,
393 return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
401 * wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
402 * @pos: Pointer to the IE header
403 * @end: Pointer to the end of the Key Data buffer
404 * @ie: Pointer to parsed IE data
405 * Returns: 0 on success, 1 if end mark is found, -1 on failure
407 static int wpa_parse_generic(const u8 *pos, const u8 *end,
408 struct wpa_eapol_ie_parse *ie)
414 RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
415 pos[2 + WPA_SELECTOR_LEN] == 1 &&
416 pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
418 ie->wpa_ie_len = pos[1] + 2;
419 wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key",
420 ie->wpa_ie, ie->wpa_ie_len);
424 if (pos + 1 + RSN_SELECTOR_LEN < end &&
425 pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
426 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
427 ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
428 wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key",
433 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
434 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
435 ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
436 ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
437 wpa_hexdump_key(MSG_DEBUG, "WPA: GTK in EAPOL-Key",
442 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
443 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
444 ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
445 ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
446 wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key",
451 #ifdef CONFIG_PEERKEY
452 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
453 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) {
454 ie->smk = pos + 2 + RSN_SELECTOR_LEN;
455 ie->smk_len = pos[1] - RSN_SELECTOR_LEN;
456 wpa_hexdump_key(MSG_DEBUG, "WPA: SMK in EAPOL-Key",
461 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
462 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) {
463 ie->nonce = pos + 2 + RSN_SELECTOR_LEN;
464 ie->nonce_len = pos[1] - RSN_SELECTOR_LEN;
465 wpa_hexdump(MSG_DEBUG, "WPA: Nonce in EAPOL-Key",
470 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
471 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) {
472 ie->lifetime = pos + 2 + RSN_SELECTOR_LEN;
473 ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN;
474 wpa_hexdump(MSG_DEBUG, "WPA: Lifetime in EAPOL-Key",
479 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
480 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) {
481 ie->error = pos + 2 + RSN_SELECTOR_LEN;
482 ie->error_len = pos[1] - RSN_SELECTOR_LEN;
483 wpa_hexdump(MSG_DEBUG, "WPA: Error in EAPOL-Key",
487 #endif /* CONFIG_PEERKEY */
489 #ifdef CONFIG_IEEE80211W
490 if (pos[1] > RSN_SELECTOR_LEN + 2 &&
491 RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
492 ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
493 ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
494 wpa_hexdump_key(MSG_DEBUG, "WPA: IGTK in EAPOL-Key",
498 #endif /* CONFIG_IEEE80211W */
505 * wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
506 * @buf: Pointer to the Key Data buffer
507 * @len: Key Data Length
508 * @ie: Pointer to parsed IE data
509 * Returns: 0 on success, -1 on failure
511 int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
512 struct wpa_eapol_ie_parse *ie)
517 os_memset(ie, 0, sizeof(*ie));
518 for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) {
519 if (pos[0] == 0xdd &&
520 ((pos == buf + len - 1) || pos[1] == 0)) {
524 if (pos + 2 + pos[1] > end) {
525 wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
526 "underflow (ie=%d len=%d pos=%d)",
527 pos[0], pos[1], (int) (pos - buf));
528 wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data",
533 if (*pos == WLAN_EID_RSN) {
535 ie->rsn_ie_len = pos[1] + 2;
536 wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key",
537 ie->rsn_ie, ie->rsn_ie_len);
538 #ifdef CONFIG_IEEE80211R
539 } else if (*pos == WLAN_EID_MOBILITY_DOMAIN) {
541 ie->mdie_len = pos[1] + 2;
542 wpa_hexdump(MSG_DEBUG, "WPA: MDIE in EAPOL-Key",
543 ie->mdie, ie->mdie_len);
544 } else if (*pos == WLAN_EID_FAST_BSS_TRANSITION) {
546 ie->ftie_len = pos[1] + 2;
547 wpa_hexdump(MSG_DEBUG, "WPA: FTIE in EAPOL-Key",
548 ie->ftie, ie->ftie_len);
549 } else if (*pos == WLAN_EID_TIMEOUT_INTERVAL && pos[1] >= 5) {
550 if (pos[2] == WLAN_TIMEOUT_REASSOC_DEADLINE) {
551 ie->reassoc_deadline = pos;
552 wpa_hexdump(MSG_DEBUG, "WPA: Reassoc Deadline "
554 ie->reassoc_deadline, pos[1] + 2);
555 } else if (pos[2] == WLAN_TIMEOUT_KEY_LIFETIME) {
556 ie->key_lifetime = pos;
557 wpa_hexdump(MSG_DEBUG, "WPA: KeyLifetime "
559 ie->key_lifetime, pos[1] + 2);
561 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized "
562 "EAPOL-Key Key Data IE",
565 #endif /* CONFIG_IEEE80211R */
566 } else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
567 ret = wpa_parse_generic(pos, end, ie);
575 wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
576 "Key Data IE", pos, 2 + pos[1]);