esp-idf/components/wpa_supplicant/src/rsn_supp/wpa_ie.c

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/*
* wpa_supplicant - WPA/RSN IE and KDE processing
* Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#ifdef ESP_SUPPLICANT
#include "utils/includes.h"
#include "utils/common.h"
#include "rsn_supp/wpa.h"
#include "common/ieee802_11_defs.h"
#include "rsn_supp/wpa_ie.h"
/**
* wpa_parse_wpa_ie - Parse WPA/RSN IE
* @wpa_ie: Pointer to WPA or RSN IE
* @wpa_ie_len: Length of the WPA/RSN IE
* @data: Pointer to data area for parsing results
* Returns: 0 on success, -1 on failure
*
* Parse the contents of WPA or RSN IE and write the parsed data into data.
*/
int wpa_parse_wpa_ie(const u8 *wpa_ie, size_t wpa_ie_len,
struct wpa_ie_data *data)
{
if (wpa_ie_len >= 1 && wpa_ie[0] == WLAN_EID_RSN)
return wpa_parse_wpa_ie_rsn(wpa_ie, wpa_ie_len, data);
else
return wpa_parse_wpa_ie_wpa(wpa_ie, wpa_ie_len, data);
}
/**
* wpa_parse_generic - Parse EAPOL-Key Key Data Generic IEs
* @pos: Pointer to the IE header
* @end: Pointer to the end of the Key Data buffer
* @ie: Pointer to parsed IE data
* Returns: 0 on success, 1 if end mark is found, -1 on failure
*/
static int wpa_parse_generic(const u8 *pos, const u8 *end,
struct wpa_eapol_ie_parse *ie)
{
if (pos[1] == 0)
return 1;
if (pos[1] >= 6 &&
RSN_SELECTOR_GET(pos + 2) == WPA_OUI_TYPE &&
pos[2 + WPA_SELECTOR_LEN] == 1 &&
pos[2 + WPA_SELECTOR_LEN + 1] == 0) {
ie->wpa_ie = pos;
ie->wpa_ie_len = pos[1] + 2;
wpa_hexdump(MSG_DEBUG, "WPA: WPA IE in EAPOL-Key",
ie->wpa_ie, ie->wpa_ie_len);
return 0;
}
if (pos + 1 + RSN_SELECTOR_LEN < end &&
pos[1] >= RSN_SELECTOR_LEN + PMKID_LEN &&
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_PMKID) {
ie->pmkid = pos + 2 + RSN_SELECTOR_LEN;
wpa_hexdump(MSG_DEBUG, "WPA: PMKID in EAPOL-Key",
pos, pos[1] + 2);
return 0;
}
if (pos[1] > RSN_SELECTOR_LEN + 2 &&
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_GROUPKEY) {
ie->gtk = pos + 2 + RSN_SELECTOR_LEN;
ie->gtk_len = pos[1] - RSN_SELECTOR_LEN;
wpa_hexdump(MSG_DEBUG, "WPA: GTK in EAPOL-Key",
pos, pos[1] + 2);
return 0;
}
if (pos[1] > RSN_SELECTOR_LEN + 2 &&
RSN_SELECTOR_GET(pos + 2) == RSN_KEY_DATA_MAC_ADDR) {
ie->mac_addr = pos + 2 + RSN_SELECTOR_LEN;
ie->mac_addr_len = pos[1] - RSN_SELECTOR_LEN;
wpa_hexdump(MSG_DEBUG, "WPA: MAC Address in EAPOL-Key",
pos, pos[1] + 2);
return 0;
}
return 0;
}
/**
* wpa_supplicant_parse_ies - Parse EAPOL-Key Key Data IEs
* @buf: Pointer to the Key Data buffer
* @len: Key Data Length
* @ie: Pointer to parsed IE data
* Returns: 0 on success, -1 on failure
*/
int wpa_supplicant_parse_ies(const u8 *buf, size_t len,
struct wpa_eapol_ie_parse *ie)
{
const u8 *pos, *end;
int ret = 0;
memset(ie, 0, sizeof(*ie));
for (pos = buf, end = pos + len; pos + 1 < end; pos += 2 + pos[1]) {
if (pos[0] == 0xdd &&
((pos == buf + len - 1) || pos[1] == 0)) {
/* Ignore padding */
break;
}
if (pos + 2 + pos[1] > end) {
#ifdef DEBUG_PRINT
wpa_printf(MSG_DEBUG, "WPA: EAPOL-Key Key Data "
"underflow (ie=%d len=%d pos=%d)",
pos[0], pos[1], (int) (pos - buf));
#endif
wpa_hexdump(MSG_DEBUG, "WPA: Key Data",
buf, len);
ret = -1;
break;
}
if (*pos == WLAN_EID_RSN) {
ie->rsn_ie = pos;
ie->rsn_ie_len = pos[1] + 2;
wpa_hexdump(MSG_DEBUG, "WPA: RSN IE in EAPOL-Key",
ie->rsn_ie, ie->rsn_ie_len);
} else if (*pos == WLAN_EID_VENDOR_SPECIFIC) {
ret = wpa_parse_generic(pos, end, ie);
if (ret < 0)
break;
if (ret > 0) {
ret = 0;
break;
}
} else {
wpa_hexdump(MSG_DEBUG, "WPA: Unrecognized EAPOL-Key "
"Key Data IE", pos, 2 + pos[1]);
}
}
return ret;
}
static int wpa_gen_wpa_ie_wpa(u8 *wpa_ie, size_t wpa_ie_len,
int pairwise_cipher, int group_cipher,
int key_mgmt)
{
u8 *pos;
struct wpa_ie_hdr *hdr;
if (wpa_ie_len < sizeof(*hdr) + WPA_SELECTOR_LEN +
2 + WPA_SELECTOR_LEN + 2 + WPA_SELECTOR_LEN)
return -1;
hdr = (struct wpa_ie_hdr *) wpa_ie;
hdr->elem_id = WLAN_EID_VENDOR_SPECIFIC;
RSN_SELECTOR_PUT(hdr->oui, WPA_OUI_TYPE);
WPA_PUT_LE16(hdr->version, WPA_VERSION);
pos = (u8 *) (hdr + 1);
if (group_cipher == WPA_CIPHER_CCMP) {
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP);
} else if (group_cipher == WPA_CIPHER_TKIP) {
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP);
} else if (group_cipher == WPA_CIPHER_WEP104) {
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP104);
} else if (group_cipher == WPA_CIPHER_WEP40) {
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_WEP40);
} else {
wpa_printf(MSG_DEBUG, "Invalid group cipher (%d).",
group_cipher);
return -1;
}
pos += WPA_SELECTOR_LEN;
*pos++ = 1;
*pos++ = 0;
if (pairwise_cipher == WPA_CIPHER_CCMP) {
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_CCMP);
} else if (pairwise_cipher == WPA_CIPHER_TKIP) {
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_TKIP);
} else if (pairwise_cipher == WPA_CIPHER_NONE) {
RSN_SELECTOR_PUT(pos, WPA_CIPHER_SUITE_NONE);
} else {
wpa_printf(MSG_DEBUG, "Invalid pairwise cipher (%d).",
pairwise_cipher);
return -1;
}
pos += WPA_SELECTOR_LEN;
*pos++ = 1;
*pos++ = 0;
if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_UNSPEC_802_1X);
} else if (key_mgmt == WPA_KEY_MGMT_PSK) {
RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_PSK_OVER_802_1X);
} else if (key_mgmt == WPA_KEY_MGMT_WPA_NONE) {
RSN_SELECTOR_PUT(pos, WPA_AUTH_KEY_MGMT_NONE);
} else {
wpa_printf(MSG_DEBUG, "Invalid key management type (%d).",
key_mgmt);
return -1;
}
pos += WPA_SELECTOR_LEN;
/* WPA Capabilities; use defaults, so no need to include it */
hdr->len = (pos - wpa_ie) - 2;
WPA_ASSERT((size_t) (pos - wpa_ie) <= wpa_ie_len);
return pos - wpa_ie;
}
static int 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)
{
#ifndef CONFIG_NO_WPA2
u8 *pos;
struct rsn_ie_hdr *hdr;
u16 capab;
u8 min_len = 0;
/* For WPA2-PSK, if the RSNE in AP beacon/probe response doesn't specify the
* pairwise cipher or AKM suite, the RSNE IE in association request
* should only contain group cihpher suite, otherwise the WPA2 improvements
* certification will fail.
*/
if ( (sm->ap_notify_completed_rsne == true) || (key_mgmt == WPA_KEY_MGMT_IEEE8021X) ) {
min_len = sizeof(*hdr) + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2 + RSN_SELECTOR_LEN + 2;
} else {
min_len = sizeof(*hdr) + RSN_SELECTOR_LEN;
}
if (rsn_ie_len < min_len) {
wpa_printf(MSG_DEBUG, "RSN: Too short IE buffer (%lu bytes)", (unsigned long) rsn_ie_len);
}
hdr = (struct rsn_ie_hdr *) rsn_ie;
hdr->elem_id = WLAN_EID_RSN;
WPA_PUT_LE16(hdr->version, RSN_VERSION);
pos = (u8 *) (hdr + 1);
if (group_cipher == WPA_CIPHER_CCMP) {
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
} else if (group_cipher == WPA_CIPHER_TKIP) {
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
} else if (group_cipher == WPA_CIPHER_WEP104) {
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP104);
} else if (group_cipher == WPA_CIPHER_WEP40) {
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_WEP40);
} else {
wpa_printf(MSG_DEBUG, "Invalid group cipher (%d).",
group_cipher);
return -1;
}
pos += RSN_SELECTOR_LEN;
if ( (sm->ap_notify_completed_rsne == false) && (key_mgmt != WPA_KEY_MGMT_IEEE8021X) ) {
hdr->len = (pos - rsn_ie) - 2;
return (pos - rsn_ie);
}
*pos++ = 1;
*pos++ = 0;
if (pairwise_cipher == WPA_CIPHER_CCMP) {
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
} else if (pairwise_cipher == WPA_CIPHER_TKIP) {
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
} else if (pairwise_cipher == WPA_CIPHER_NONE) {
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_NONE);
} else {
wpa_printf(MSG_DEBUG, "Invalid pairwise cipher (%d).",
pairwise_cipher);
return -1;
}
pos += RSN_SELECTOR_LEN;
*pos++ = 1;
*pos++ = 0;
if (key_mgmt == WPA_KEY_MGMT_IEEE8021X) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_UNSPEC_802_1X);
} else if (key_mgmt == WPA_KEY_MGMT_PSK) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_OVER_802_1X);
#ifdef CONFIG_IEEE80211R
} else if (key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X);
} else if (key_mgmt == WPA_KEY_MGMT_FT_PSK) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK);
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_IEEE80211W
} else if (key_mgmt == WPA_KEY_MGMT_IEEE8021X_SHA256) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_802_1X_SHA256);
} else if (key_mgmt == WPA_KEY_MGMT_PSK_SHA256) {
RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_PSK_SHA256);
#endif /* CONFIG_IEEE80211W */
} else {
wpa_printf(MSG_DEBUG, "Invalid key management type (%d).",
key_mgmt);
return -1;
}
pos += RSN_SELECTOR_LEN;
/* RSN Capabilities */
capab = 0;
#ifdef CONFIG_IEEE80211W
if (sm->mfp)
capab |= WPA_CAPABILITY_MFPC;
if (sm->mfp == 2)
capab |= WPA_CAPABILITY_MFPR;
#endif /* CONFIG_IEEE80211W */
WPA_PUT_LE16(pos, capab);
pos += 2;
#ifdef CONFIG_IEEE80211W
if (mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) {
if (!sm->cur_pmksa) {
/* PMKID Count */
WPA_PUT_LE16(pos, 0);
pos += 2;
}
/* Management Group Cipher Suite */
RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC);
pos += RSN_SELECTOR_LEN;
}
#endif /* CONFIG_IEEE80211W */
hdr->len = (pos - rsn_ie) - 2;
WPA_ASSERT((size_t) (pos - rsn_ie) <= rsn_ie_len);
return pos - rsn_ie;
#else /* CONFIG_NO_WPA2 */
return -1;
#endif /* CONFIG_NO_WPA2 */
}
/**
* wpa_gen_wpa_ie - Generate WPA/RSN IE based on current security policy
* @sm: Pointer to WPA state machine data from wpa_sm_init()
* @wpa_ie: Pointer to memory area for the generated WPA/RSN IE
* @wpa_ie_len: Maximum length of the generated WPA/RSN IE
* Returns: Length of the generated WPA/RSN IE or -1 on failure
*/
int wpa_gen_wpa_ie(struct wpa_sm *sm, u8 *wpa_ie, size_t wpa_ie_len)
{
if (sm->proto == WPA_PROTO_RSN)
return wpa_gen_wpa_ie_rsn(wpa_ie, wpa_ie_len,
sm->pairwise_cipher,
sm->group_cipher,
sm->key_mgmt, sm->mgmt_group_cipher,
sm);
else
return wpa_gen_wpa_ie_wpa(wpa_ie, wpa_ie_len,
sm->pairwise_cipher,
sm->group_cipher,
sm->key_mgmt);
}
#endif // ESP_SUPPLICANT