2
* wpa_supplicant - WPA/RSN IE and KDE processing
3
* Copyright (c) 2003-2007, 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 "config_ssid.h"
20
#include "pmksa_cache.h"
21
#include "ieee802_11_defs.h"
26
static int wpa_selector_to_bitfield(const u8 *s)
28
if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_NONE)
29
return WPA_CIPHER_NONE;
30
if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP40)
31
return WPA_CIPHER_WEP40;
32
if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_TKIP)
33
return WPA_CIPHER_TKIP;
34
if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_CCMP)
35
return WPA_CIPHER_CCMP;
36
if (RSN_SELECTOR_GET(s) == WPA_CIPHER_SUITE_WEP104)
37
return WPA_CIPHER_WEP104;
42
static int wpa_key_mgmt_to_bitfield(const u8 *s)
44
if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_UNSPEC_802_1X)
45
return WPA_KEY_MGMT_IEEE8021X;
46
if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X)
47
return WPA_KEY_MGMT_PSK;
48
if (RSN_SELECTOR_GET(s) == WPA_AUTH_KEY_MGMT_NONE)
49
return WPA_KEY_MGMT_WPA_NONE;
54
static int wpa_parse_wpa_ie_wpa(const u8 *wpa_ie, size_t wpa_ie_len,
55
struct wpa_ie_data *data)
57
const struct wpa_ie_hdr *hdr;
62
os_memset(data, 0, sizeof(*data));
63
data->proto = WPA_PROTO_WPA;
64
data->pairwise_cipher = WPA_CIPHER_TKIP;
65
data->group_cipher = WPA_CIPHER_TKIP;
66
data->key_mgmt = WPA_KEY_MGMT_IEEE8021X;
67
data->capabilities = 0;
70
data->mgmt_group_cipher = 0;
72
if (wpa_ie_len == 0) {
73
/* No WPA IE - fail silently */
77
if (wpa_ie_len < sizeof(struct wpa_ie_hdr)) {
78
wpa_printf(MSG_DEBUG, "%s: ie len too short %lu",
79
__func__, (unsigned long) wpa_ie_len);
83
hdr = (const struct wpa_ie_hdr *) wpa_ie;
85
if (hdr->elem_id != WLAN_EID_VENDOR_SPECIFIC ||
86
hdr->len != wpa_ie_len - 2 ||
87
RSN_SELECTOR_GET(hdr->oui) != WPA_OUI_TYPE ||
88
WPA_GET_LE16(hdr->version) != WPA_VERSION) {
89
wpa_printf(MSG_DEBUG, "%s: malformed ie or unknown version",
94
pos = (const u8 *) (hdr + 1);
95
left = wpa_ie_len - sizeof(*hdr);
97
if (left >= WPA_SELECTOR_LEN) {
98
data->group_cipher = wpa_selector_to_bitfield(pos);
99
pos += WPA_SELECTOR_LEN;
100
left -= WPA_SELECTOR_LEN;
101
} else if (left > 0) {
102
wpa_printf(MSG_DEBUG, "%s: ie length mismatch, %u too much",
108
data->pairwise_cipher = 0;
109
count = WPA_GET_LE16(pos);
112
if (count == 0 || left < count * WPA_SELECTOR_LEN) {
113
wpa_printf(MSG_DEBUG, "%s: ie count botch (pairwise), "
114
"count %u left %u", __func__, count, left);
117
for (i = 0; i < count; i++) {
118
data->pairwise_cipher |= wpa_selector_to_bitfield(pos);
119
pos += WPA_SELECTOR_LEN;
120
left -= WPA_SELECTOR_LEN;
122
} else if (left == 1) {
123
wpa_printf(MSG_DEBUG, "%s: ie too short (for key mgmt)",
130
count = WPA_GET_LE16(pos);
133
if (count == 0 || left < count * WPA_SELECTOR_LEN) {
134
wpa_printf(MSG_DEBUG, "%s: ie count botch (key mgmt), "
135
"count %u left %u", __func__, count, left);
138
for (i = 0; i < count; i++) {
139
data->key_mgmt |= wpa_key_mgmt_to_bitfield(pos);
140
pos += WPA_SELECTOR_LEN;
141
left -= WPA_SELECTOR_LEN;
143
} else if (left == 1) {
144
wpa_printf(MSG_DEBUG, "%s: ie too short (for capabilities)",
150
data->capabilities = WPA_GET_LE16(pos);
156
wpa_printf(MSG_DEBUG, "%s: ie has %u trailing bytes - ignored",
165
* wpa_parse_wpa_ie - Parse WPA/RSN IE
166
* @wpa_ie: Pointer to WPA or RSN IE
167
* @wpa_ie_len: Length of the WPA/RSN IE
168
* @data: Pointer to data area for parsing results
169
* Returns: 0 on success, -1 on failure
171
* Parse the contents of WPA or RSN IE and write the parsed data into data.
173
int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len,
174
struct wpa_ie_data *data)
176
if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN)
177
return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
179
return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
183
static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
184
int pairwise_cipher, int group_cipher,
188
struct wpa_ie_hdr *hdr;
190
if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
191
2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
194
hdr = (struct wpa_ie_hdr *) wpa_ie;
195
hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
196
RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
197
WPA_PUT_LE16(hdr->version, WPA_VERSION);
198
pos = (u8 *) (hdr + 1);
200
if (group_cipher == WPA_CIPHER_CCMP) {
201
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP);
202
} else if (group_cipher == WPA_CIPHER_TKIP) {
203
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP);
204
} else if (group_cipher == WPA_CIPHER_WEP104) {
205
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP104);
206
} else if (group_cipher == WPA_CIPHER_WEP40) {
207
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP40);
209
wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
213
pos += WPA_SELECTOR_LEN;
217
if (pairwise_cipher == WPA_CIPHER_CCMP) {
218
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP);
219
} else if (pairwise_cipher == WPA_CIPHER_TKIP) {
220
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP);
221
} else if (pairwise_cipher == WPA_CIPHER_NONE) {
222
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_NONE);
224
wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
228
pos += WPA_SELECTOR_LEN;
232
if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
233
RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
234
} else if (key_mgmt == WPA_KEY_MGMT_PSK) {
235
RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
236
} else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
237
RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
239
wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
243
pos += WPA_SELECTOR_LEN;
245
/* WPA Capabilities; use defaults, so no need to include it */
247
hdr->len = (pos - wpa_ie) - 2;
249
WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
255
static int wpa_gen_wpa_ie_rsn(u8 *rsn_ie, size_t rsn_ie_len,
256
int pairwise_cipher, int group_cipher,
257
int key_mgmt, int mgmt_group_cipher,
260
#ifndef CONFIG_NO_WPA2
262
struct rsn_ie_hdr *hdr;
265
if (rsn_ie_len < sizeof(*hdr) + RSN_SELECTOR_LEN +
266
2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 +
267
(sm->cur_pmksa ? 2 + PMKID_LEN : 0)) {
268
wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)",
269
(unsigned long) rsn_ie_len);
273
hdr = (struct rsn_ie_hdr *) rsn_ie;
274
hdr->elem_id = WLAN_EID_RSN;
275
WPA_PUT_LE16(hdr->version, RSN_VERSION);
276
pos = (u8 *) (hdr + 1);
278
if (group_cipher == WPA_CIPHER_CCMP) {
279
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
280
} else if (group_cipher == WPA_CIPHER_TKIP) {
281
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
282
} else if (group_cipher == WPA_CIPHER_WEP104) {
283
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP104);
284
} else if (group_cipher == WPA_CIPHER_WEP40) {
285
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP40);
287
wpa_printf(MSG_WARNING, "Invalid group cipher (%d).",
291
pos += RSN_SELECTOR_LEN;
295
if (pairwise_cipher == WPA_CIPHER_CCMP) {
296
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
297
} else if (pairwise_cipher == WPA_CIPHER_TKIP) {
298
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
299
} else if (pairwise_cipher == WPA_CIPHER_NONE) {
300
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NONE);
302
wpa_printf(MSG_WARNING, "Invalid pairwise cipher (%d).",
306
pos += RSN_SELECTOR_LEN;
310
if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
311
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
312
} else if (key_mgmt == WPA_KEY_MGMT_PSK) {
313
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
314
#ifdef CONFIG_IEEE80211R
315
} else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
316
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
317
} else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
318
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
319
#endif /* CONFIG_IEEE80211R */
321
wpa_printf(MSG_WARNING, "Invalid key management type (%d).",
325
pos += RSN_SELECTOR_LEN;
327
/* RSN Capabilities */
329
#ifdef CONFIG_IEEE80211W
330
if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC)
331
capab |= WPA_CAPABILITY_MGMT_FRAME_PROTECTION;
332
#endif /* CONFIG_IEEE80211W */
333
WPA_PUT_LE16(pos, capab);
337
/* PMKID Count (2 octets, little endian) */
341
os_memcpy(pos, sm->cur_pmksa->pmkid, PMKID_LEN);
345
#ifdef CONFIG_IEEE80211W
346
if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
347
if (!sm->cur_pmksa) {
349
WPA_PUT_LE16(pos, 0);
353
/* Management Group Cipher Suite */
354
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
355
pos += RSN_SELECTOR_LEN;
357
#endif /* CONFIG_IEEE80211W */
359
hdr->len = (pos - rsn_ie) - 2;
361
WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
364
#else /* CONFIG_NO_WPA2 */
366
#endif /* CONFIG_NO_WPA2 */
371
* wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
372
* @sm: Pointer to WPA state machine data from wpa_sm_init()
373
* @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
374
* @wpa_ie_len: Maximum length of the generated WPA/RSN IE
375
* Returns: Length of the generated WPA/RSN IE or -1 on failure
377
int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
379
if (sm->proto == WPA_PROTO_RSN)
380
return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
383
sm->key_mgmt, sm->mgmt_group_cipher,
386
return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
394
* wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
395
* @pos: Pointer to the IE header
396
* @end: Pointer to the end of the Key Data buffer
397
* @ie: Pointer to parsed IE data
398
* Returns: 0 on success, 1 if end mark is found, -1 on failure
400
static int wpa_parse_generic(const u8 *pos, const u8 *end,
401
struct wpa_eapol_ie_parse *ie)
407
RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
408
pos[2 + WPA_SELECTOR_LEN] == 1 &&
409
pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
411
ie->wpa_ie_len = pos[1] + 2;
415
if (pos + 1 + RSN_SELECTOR_LEN < end &&
416
pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
417
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
418
ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
422
if (pos[1] > RSN_SELECTOR_LEN + 2 &&
423
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
424
ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
425
ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
429
if (pos[1] > RSN_SELECTOR_LEN + 2 &&
430
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
431
ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
432
ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
436
#ifdef CONFIG_PEERKEY
437
if (pos[1] > RSN_SELECTOR_LEN + 2 &&
438
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_SMK) {
439
ie->smk = pos + 2 + RSN_SELECTOR_LEN;
440
ie->smk_len = pos[1] - RSN_SELECTOR_LEN;
444
if (pos[1] > RSN_SELECTOR_LEN + 2 &&
445
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_NONCE) {
446
ie->nonce = pos + 2 + RSN_SELECTOR_LEN;
447
ie->nonce_len = pos[1] - RSN_SELECTOR_LEN;
451
if (pos[1] > RSN_SELECTOR_LEN + 2 &&
452
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_LIFETIME) {
453
ie->lifetime = pos + 2 + RSN_SELECTOR_LEN;
454
ie->lifetime_len = pos[1] - RSN_SELECTOR_LEN;
458
if (pos[1] > RSN_SELECTOR_LEN + 2 &&
459
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_ERROR) {
460
ie->error = pos + 2 + RSN_SELECTOR_LEN;
461
ie->error_len = pos[1] - RSN_SELECTOR_LEN;
464
#endif /* CONFIG_PEERKEY */
466
#ifdef CONFIG_IEEE80211W
467
if (pos[1] > RSN_SELECTOR_LEN + 2 &&
468
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_IGTK) {
469
ie->igtk = pos + 2 + RSN_SELECTOR_LEN;
470
ie->igtk_len = pos[1] - RSN_SELECTOR_LEN;
473
#endif /* CONFIG_IEEE80211W */
480
* wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
481
* @buf: Pointer to the Key Data buffer
482
* @len: Key Data Length
483
* @ie: Pointer to parsed IE data
484
* Returns: 0 on success, -1 on failure
486
int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
487
struct wpa_eapol_ie_parse *ie)
492
os_memset(ie, 0, sizeof(*ie));
493
for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) {
494
if (pos[0] == 0xdd &&
495
((pos == buf + len - 1) || pos[1] == 0)) {
499
if (pos + 2 + pos[1] > end) {
500
wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
501
"underflow (ie=%d len=%d pos=%d)",
502
pos[0], pos[1], (int) (pos - buf));
503
wpa_hexdump_key(MSG_DEBUG, "WPA: Key Data",
508
if (*pos == WLAN_EID_RSN) {
510
ie->rsn_ie_len = pos[1] + 2;
511
#ifdef CONFIG_IEEE80211R
512
} else if (*pos == WLAN_EID_MOBILITY_DOMAIN) {
514
ie->mdie_len = pos[1] + 2;
515
#endif /* CONFIG_IEEE80211R */
516
} else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
517
ret = wpa_parse_generic(pos, end, ie);
525
wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
526
"Key Data IE", pos, 2 + pos[1]);
added
removed
src/rsn_supp/wpa_ie.c
