1083 lines
29 KiB
C
1083 lines
29 KiB
C
/*
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* Received Data frame processing
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* Copyright (c) 2010, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "crypto/aes_wrap.h"
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#include "crypto/crypto.h"
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#include "common/ieee802_11_defs.h"
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#include "common/eapol_common.h"
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#include "common/wpa_common.h"
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#include "rsn_supp/wpa_ie.h"
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#include "wlantest.h"
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static const char * data_stype(u16 stype)
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{
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switch (stype) {
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case WLAN_FC_STYPE_DATA:
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return "DATA";
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case WLAN_FC_STYPE_DATA_CFACK:
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return "DATA-CFACK";
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case WLAN_FC_STYPE_DATA_CFPOLL:
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return "DATA-CFPOLL";
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case WLAN_FC_STYPE_DATA_CFACKPOLL:
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return "DATA-CFACKPOLL";
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case WLAN_FC_STYPE_NULLFUNC:
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return "NULLFUNC";
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case WLAN_FC_STYPE_CFACK:
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return "CFACK";
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case WLAN_FC_STYPE_CFPOLL:
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return "CFPOLL";
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case WLAN_FC_STYPE_CFACKPOLL:
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return "CFACKPOLL";
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case WLAN_FC_STYPE_QOS_DATA:
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return "QOSDATA";
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case WLAN_FC_STYPE_QOS_DATA_CFACK:
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return "QOSDATA-CFACK";
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case WLAN_FC_STYPE_QOS_DATA_CFPOLL:
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return "QOSDATA-CFPOLL";
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case WLAN_FC_STYPE_QOS_DATA_CFACKPOLL:
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return "QOSDATA-CFACKPOLL";
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case WLAN_FC_STYPE_QOS_NULL:
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return "QOS-NULL";
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case WLAN_FC_STYPE_QOS_CFPOLL:
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return "QOS-CFPOLL";
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case WLAN_FC_STYPE_QOS_CFACKPOLL:
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return "QOS-CFACKPOLL";
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}
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return "??";
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}
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static int check_mic(const u8 *kck, int ver, const u8 *data, size_t len)
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{
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u8 *buf;
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int ret = -1;
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struct ieee802_1x_hdr *hdr;
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struct wpa_eapol_key *key;
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u8 rx_mic[16];
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buf = os_malloc(len);
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if (buf == NULL)
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return -1;
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os_memcpy(buf, data, len);
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hdr = (struct ieee802_1x_hdr *) buf;
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key = (struct wpa_eapol_key *) (hdr + 1);
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os_memcpy(rx_mic, key->key_mic, 16);
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os_memset(key->key_mic, 0, 16);
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if (wpa_eapol_key_mic(kck, ver, buf, len, key->key_mic) == 0 &&
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os_memcmp(rx_mic, key->key_mic, 16) == 0)
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ret = 0;
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os_free(buf);
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return ret;
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}
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static void rx_data_eapol_key_1_of_4(struct wlantest *wt, const u8 *dst,
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const u8 *src, const u8 *data, size_t len)
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{
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struct wlantest_bss *bss;
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struct wlantest_sta *sta;
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const struct ieee802_1x_hdr *eapol;
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const struct wpa_eapol_key *hdr;
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wpa_printf(MSG_DEBUG, "EAPOL-Key 1/4 " MACSTR " -> " MACSTR,
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MAC2STR(src), MAC2STR(dst));
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bss = bss_get(wt, src);
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if (bss == NULL)
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return;
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sta = sta_get(bss, dst);
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if (sta == NULL)
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return;
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eapol = (const struct ieee802_1x_hdr *) data;
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hdr = (const struct wpa_eapol_key *) (eapol + 1);
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os_memcpy(sta->anonce, hdr->key_nonce, WPA_NONCE_LEN);
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}
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static int try_pmk(struct wlantest_bss *bss, struct wlantest_sta *sta,
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u16 ver, const u8 *data, size_t len,
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struct wlantest_pmk *pmk)
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{
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struct wpa_ptk ptk;
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size_t ptk_len = 48; /* FIX: 64 for TKIP */
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wpa_pmk_to_ptk(pmk->pmk, sizeof(pmk->pmk),
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"Pairwise key expansion",
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bss->bssid, sta->addr, sta->anonce, sta->snonce,
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(u8 *) &ptk, ptk_len,
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0 /* FIX: SHA256 based on AKM */);
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if (check_mic(ptk.kck, ver, data, len) < 0)
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return -1;
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wpa_printf(MSG_INFO, "Derived PTK for STA " MACSTR " BSSID " MACSTR,
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MAC2STR(sta->addr), MAC2STR(bss->bssid));
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os_memcpy(&sta->ptk, &ptk, sizeof(ptk));
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wpa_hexdump(MSG_DEBUG, "PTK:KCK", sta->ptk.kck, 16);
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wpa_hexdump(MSG_DEBUG, "PTK:KEK", sta->ptk.kek, 16);
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wpa_hexdump(MSG_DEBUG, "PTK:TK1", sta->ptk.tk1, 16);
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if (ptk_len > 48)
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wpa_hexdump(MSG_DEBUG, "PTK:TK2", sta->ptk.u.tk2, 16);
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sta->ptk_set = 1;
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os_memset(sta->rsc_tods, 0, sizeof(sta->rsc_tods));
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os_memset(sta->rsc_fromds, 0, sizeof(sta->rsc_fromds));
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return 0;
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}
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static void derive_ptk(struct wlantest *wt, struct wlantest_bss *bss,
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struct wlantest_sta *sta, u16 ver,
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const u8 *data, size_t len)
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{
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struct wlantest_pmk *pmk;
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dl_list_for_each(pmk, &bss->pmk, struct wlantest_pmk, list) {
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if (try_pmk(bss, sta, ver, data, len, pmk) == 0)
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return;
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}
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dl_list_for_each(pmk, &wt->pmk, struct wlantest_pmk, list) {
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if (try_pmk(bss, sta, ver, data, len, pmk) == 0)
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return;
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}
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}
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static void rx_data_eapol_key_2_of_4(struct wlantest *wt, const u8 *dst,
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const u8 *src, const u8 *data, size_t len)
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{
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struct wlantest_bss *bss;
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struct wlantest_sta *sta;
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const struct ieee802_1x_hdr *eapol;
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const struct wpa_eapol_key *hdr;
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const u8 *key_data;
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u16 key_info, key_data_len;
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struct wpa_eapol_ie_parse ie;
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wpa_printf(MSG_DEBUG, "EAPOL-Key 2/4 " MACSTR " -> " MACSTR,
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MAC2STR(src), MAC2STR(dst));
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bss = bss_get(wt, dst);
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if (bss == NULL)
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return;
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sta = sta_get(bss, src);
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if (sta == NULL)
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return;
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eapol = (const struct ieee802_1x_hdr *) data;
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hdr = (const struct wpa_eapol_key *) (eapol + 1);
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os_memcpy(sta->snonce, hdr->key_nonce, WPA_NONCE_LEN);
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key_info = WPA_GET_BE16(hdr->key_info);
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key_data_len = WPA_GET_BE16(hdr->key_data_length);
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derive_ptk(wt, bss, sta, key_info & WPA_KEY_INFO_TYPE_MASK, data, len);
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if (!sta->ptk_set) {
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wpa_printf(MSG_DEBUG, "No PTK known to process EAPOL-Key 2/4");
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return;
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}
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if (check_mic(sta->ptk.kck, key_info & WPA_KEY_INFO_TYPE_MASK,
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data, len) < 0) {
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wpa_printf(MSG_INFO, "Mismatch in EAPOL-Key 2/4 MIC");
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return;
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}
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wpa_printf(MSG_DEBUG, "Valid MIC found in EAPOL-Key 2/4");
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key_data = (const u8 *) (hdr + 1);
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if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0) {
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wpa_printf(MSG_INFO, "Failed to parse EAPOL-Key Key Data");
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return;
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}
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if (ie.wpa_ie) {
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - WPA IE",
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ie.wpa_ie, ie.wpa_ie_len);
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}
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if (ie.rsn_ie) {
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - RSN IE",
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ie.rsn_ie, ie.rsn_ie_len);
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}
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}
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static u8 * decrypt_eapol_key_data_rc4(const u8 *kek,
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const struct wpa_eapol_key *hdr,
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size_t *len)
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{
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u8 ek[32], *buf;
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u16 keydatalen = WPA_GET_BE16(hdr->key_data_length);
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buf = os_malloc(keydatalen);
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if (buf == NULL)
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return NULL;
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os_memcpy(ek, hdr->key_iv, 16);
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os_memcpy(ek + 16, kek, 16);
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os_memcpy(buf, hdr + 1, keydatalen);
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if (rc4_skip(ek, 32, 256, buf, keydatalen)) {
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wpa_printf(MSG_INFO, "RC4 failed");
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os_free(buf);
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return NULL;
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}
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*len = keydatalen;
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return buf;
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}
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static u8 * decrypt_eapol_key_data_aes(const u8 *kek,
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const struct wpa_eapol_key *hdr,
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size_t *len)
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{
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u8 *buf;
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u16 keydatalen = WPA_GET_BE16(hdr->key_data_length);
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if (keydatalen % 8) {
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wpa_printf(MSG_INFO, "Unsupported AES-WRAP len %d",
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keydatalen);
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return NULL;
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}
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keydatalen -= 8; /* AES-WRAP adds 8 bytes */
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buf = os_malloc(keydatalen);
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if (buf == NULL)
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return NULL;
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if (aes_unwrap(kek, keydatalen / 8, (u8 *) (hdr + 1), buf)) {
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os_free(buf);
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wpa_printf(MSG_INFO, "AES unwrap failed - "
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"could not decrypt EAPOL-Key key data");
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return NULL;
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}
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*len = keydatalen;
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return buf;
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}
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static u8 * decrypt_eapol_key_data(const u8 *kek, u16 ver,
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const struct wpa_eapol_key *hdr,
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size_t *len)
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{
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switch (ver) {
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case WPA_KEY_INFO_TYPE_HMAC_MD5_RC4:
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return decrypt_eapol_key_data_rc4(kek, hdr, len);
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case WPA_KEY_INFO_TYPE_HMAC_SHA1_AES:
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case WPA_KEY_INFO_TYPE_AES_128_CMAC:
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return decrypt_eapol_key_data_aes(kek, hdr, len);
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default:
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wpa_printf(MSG_INFO, "Unsupported EAPOL-Key Key Descriptor "
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"Version %u", ver);
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return NULL;
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}
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}
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static void learn_kde_keys(struct wlantest_bss *bss, u8 *buf, size_t len,
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const u8 *rsc)
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{
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struct wpa_eapol_ie_parse ie;
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if (wpa_supplicant_parse_ies(buf, len, &ie) < 0) {
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wpa_printf(MSG_INFO, "Failed to parse EAPOL-Key Key Data");
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return;
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}
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if (ie.wpa_ie) {
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - WPA IE",
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ie.wpa_ie, ie.wpa_ie_len);
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}
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if (ie.rsn_ie) {
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - RSN IE",
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ie.rsn_ie, ie.rsn_ie_len);
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}
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if (ie.gtk) {
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - GTK KDE",
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ie.gtk, ie.gtk_len);
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if (ie.gtk_len >= 2 && ie.gtk_len <= 2 + 32) {
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int id;
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id = ie.gtk[0] & 0x03;
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wpa_printf(MSG_DEBUG, "GTK KeyID=%u tx=%u",
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id, !!(ie.gtk[0] & 0x04));
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if ((ie.gtk[0] & 0xf8) || ie.gtk[1])
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wpa_printf(MSG_INFO, "GTK KDE: Reserved field "
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"set: %02x %02x",
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ie.gtk[0], ie.gtk[1]);
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wpa_hexdump(MSG_DEBUG, "GTK", ie.gtk + 2,
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ie.gtk_len - 2);
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bss->gtk_len[id] = ie.gtk_len - 2;
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os_memcpy(bss->gtk[id], ie.gtk + 2, ie.gtk_len - 2);
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bss->rsc[id][0] = rsc[5];
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bss->rsc[id][1] = rsc[4];
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bss->rsc[id][2] = rsc[3];
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bss->rsc[id][3] = rsc[2];
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bss->rsc[id][4] = rsc[1];
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bss->rsc[id][5] = rsc[0];
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wpa_hexdump(MSG_DEBUG, "RSC", bss->rsc[id], 6);
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} else {
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wpa_printf(MSG_INFO, "Invalid GTK KDE length %u",
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(unsigned) ie.gtk_len);
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}
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}
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if (ie.igtk) {
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wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data - IGTK KDE",
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ie.igtk, ie.igtk_len);
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if (ie.igtk_len == 24) {
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u16 id;
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id = WPA_GET_LE16(ie.igtk);
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if (id > 5) {
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wpa_printf(MSG_INFO, "Unexpected IGTK KeyID "
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"%u", id);
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} else {
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wpa_printf(MSG_DEBUG, "IGTK KeyID %u", id);
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wpa_hexdump(MSG_DEBUG, "IPN", ie.igtk + 2, 6);
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wpa_hexdump(MSG_DEBUG, "IGTK", ie.igtk + 8,
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16);
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os_memcpy(bss->igtk[id], ie.igtk + 8, 16);
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bss->igtk_set[id] = 1;
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}
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} else {
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wpa_printf(MSG_INFO, "Invalid IGTK KDE length %u",
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(unsigned) ie.igtk_len);
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}
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}
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}
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static void rx_data_eapol_key_3_of_4(struct wlantest *wt, const u8 *dst,
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const u8 *src, const u8 *data, size_t len)
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{
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struct wlantest_bss *bss;
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struct wlantest_sta *sta;
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const struct ieee802_1x_hdr *eapol;
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const struct wpa_eapol_key *hdr;
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const u8 *key_data;
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int recalc = 0;
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u16 key_info, ver;
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u8 *decrypted;
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size_t decrypted_len = 0;
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wpa_printf(MSG_DEBUG, "EAPOL-Key 3/4 " MACSTR " -> " MACSTR,
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MAC2STR(src), MAC2STR(dst));
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bss = bss_get(wt, src);
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if (bss == NULL)
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return;
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sta = sta_get(bss, dst);
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if (sta == NULL)
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return;
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eapol = (const struct ieee802_1x_hdr *) data;
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hdr = (const struct wpa_eapol_key *) (eapol + 1);
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key_info = WPA_GET_BE16(hdr->key_info);
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if (os_memcmp(sta->anonce, hdr->key_nonce, WPA_NONCE_LEN) != 0) {
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wpa_printf(MSG_INFO, "EAPOL-Key ANonce mismatch between 1/4 "
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"and 3/4");
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recalc = 1;
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}
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os_memcpy(sta->anonce, hdr->key_nonce, WPA_NONCE_LEN);
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if (recalc) {
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derive_ptk(wt, bss, sta, key_info & WPA_KEY_INFO_TYPE_MASK,
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data, len);
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}
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if (!sta->ptk_set) {
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wpa_printf(MSG_DEBUG, "No PTK known to process EAPOL-Key 3/4");
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return;
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}
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if (check_mic(sta->ptk.kck, key_info & WPA_KEY_INFO_TYPE_MASK,
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data, len) < 0) {
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wpa_printf(MSG_INFO, "Mismatch in EAPOL-Key 3/4 MIC");
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return;
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}
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wpa_printf(MSG_DEBUG, "Valid MIC found in EAPOL-Key 3/4");
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key_data = (const u8 *) (hdr + 1);
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/* TODO: handle WPA without EncrKeyData bit */
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if (!(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
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wpa_printf(MSG_INFO, "EAPOL-Key 3/4 without EncrKeyData bit");
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return;
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}
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ver = key_info & WPA_KEY_INFO_TYPE_MASK;
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decrypted = decrypt_eapol_key_data(sta->ptk.kek, ver, hdr,
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&decrypted_len);
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if (decrypted == NULL) {
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wpa_printf(MSG_INFO, "Failed to decrypt EAPOL-Key Key Data");
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return;
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}
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wpa_hexdump(MSG_DEBUG, "Decrypted EAPOL-Key Key Data",
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decrypted, decrypted_len);
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if (wt->write_pcap_dumper) {
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/* Fill in a dummy Data frame header */
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u8 buf[24 + 8 + sizeof(*eapol) + sizeof(*hdr)];
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struct ieee80211_hdr *h;
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struct wpa_eapol_key *k;
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u8 *pos;
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size_t plain_len;
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plain_len = decrypted_len;
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pos = decrypted;
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while (pos + 1 < decrypted + decrypted_len) {
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if (pos[0] == 0xdd && pos[1] == 0x00) {
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/* Remove padding */
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plain_len = pos - decrypted;
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break;
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}
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pos += 2 + pos[1];
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}
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os_memset(buf, 0, sizeof(buf));
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h = (struct ieee80211_hdr *) buf;
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h->frame_control = host_to_le16(0x0208);
|
|
os_memcpy(h->addr1, dst, ETH_ALEN);
|
|
os_memcpy(h->addr2, src, ETH_ALEN);
|
|
os_memcpy(h->addr3, src, ETH_ALEN);
|
|
pos = (u8 *) (h + 1);
|
|
os_memcpy(pos, "\xaa\xaa\x03\x00\x00\x00\x88\x8e", 8);
|
|
pos += 8;
|
|
os_memcpy(pos, eapol, sizeof(*eapol));
|
|
pos += sizeof(*eapol);
|
|
os_memcpy(pos, hdr, sizeof(*hdr));
|
|
k = (struct wpa_eapol_key *) pos;
|
|
WPA_PUT_BE16(k->key_info,
|
|
key_info & ~WPA_KEY_INFO_ENCR_KEY_DATA);
|
|
WPA_PUT_BE16(k->key_data_length, plain_len);
|
|
write_pcap_decrypted(wt, buf, sizeof(buf),
|
|
decrypted, plain_len);
|
|
}
|
|
learn_kde_keys(bss, decrypted, decrypted_len, hdr->key_rsc);
|
|
os_free(decrypted);
|
|
}
|
|
|
|
|
|
static void rx_data_eapol_key_4_of_4(struct wlantest *wt, const u8 *dst,
|
|
const u8 *src, const u8 *data, size_t len)
|
|
{
|
|
struct wlantest_bss *bss;
|
|
struct wlantest_sta *sta;
|
|
const struct ieee802_1x_hdr *eapol;
|
|
const struct wpa_eapol_key *hdr;
|
|
u16 key_info;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAPOL-Key 4/4 " MACSTR " -> " MACSTR,
|
|
MAC2STR(src), MAC2STR(dst));
|
|
bss = bss_get(wt, dst);
|
|
if (bss == NULL)
|
|
return;
|
|
sta = sta_get(bss, src);
|
|
if (sta == NULL)
|
|
return;
|
|
|
|
eapol = (const struct ieee802_1x_hdr *) data;
|
|
hdr = (const struct wpa_eapol_key *) (eapol + 1);
|
|
key_info = WPA_GET_BE16(hdr->key_info);
|
|
|
|
if (!sta->ptk_set) {
|
|
wpa_printf(MSG_DEBUG, "No PTK known to process EAPOL-Key 4/4");
|
|
return;
|
|
}
|
|
|
|
if (sta->ptk_set &&
|
|
check_mic(sta->ptk.kck, key_info & WPA_KEY_INFO_TYPE_MASK,
|
|
data, len) < 0) {
|
|
wpa_printf(MSG_INFO, "Mismatch in EAPOL-Key 4/4 MIC");
|
|
return;
|
|
}
|
|
wpa_printf(MSG_DEBUG, "Valid MIC found in EAPOL-Key 4/4");
|
|
}
|
|
|
|
|
|
static void rx_data_eapol_key_1_of_2(struct wlantest *wt, const u8 *dst,
|
|
const u8 *src, const u8 *data, size_t len)
|
|
{
|
|
struct wlantest_bss *bss;
|
|
struct wlantest_sta *sta;
|
|
const struct ieee802_1x_hdr *eapol;
|
|
const struct wpa_eapol_key *hdr;
|
|
const u8 *key_data;
|
|
u16 key_info, ver;
|
|
u8 *decrypted;
|
|
size_t decrypted_len = 0;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAPOL-Key 1/2 " MACSTR " -> " MACSTR,
|
|
MAC2STR(src), MAC2STR(dst));
|
|
bss = bss_get(wt, src);
|
|
if (bss == NULL)
|
|
return;
|
|
sta = sta_get(bss, dst);
|
|
if (sta == NULL)
|
|
return;
|
|
|
|
eapol = (const struct ieee802_1x_hdr *) data;
|
|
hdr = (const struct wpa_eapol_key *) (eapol + 1);
|
|
key_info = WPA_GET_BE16(hdr->key_info);
|
|
|
|
if (!sta->ptk_set) {
|
|
wpa_printf(MSG_DEBUG, "No PTK known to process EAPOL-Key 1/2");
|
|
return;
|
|
}
|
|
|
|
if (sta->ptk_set &&
|
|
check_mic(sta->ptk.kck, key_info & WPA_KEY_INFO_TYPE_MASK,
|
|
data, len) < 0) {
|
|
wpa_printf(MSG_INFO, "Mismatch in EAPOL-Key 1/2 MIC");
|
|
return;
|
|
}
|
|
wpa_printf(MSG_DEBUG, "Valid MIC found in EAPOL-Key 1/2");
|
|
|
|
key_data = (const u8 *) (hdr + 1);
|
|
/* TODO: handle WPA without EncrKeyData bit */
|
|
if (!(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
|
|
wpa_printf(MSG_INFO, "EAPOL-Key 1/2 without EncrKeyData bit");
|
|
return;
|
|
}
|
|
ver = key_info & WPA_KEY_INFO_TYPE_MASK;
|
|
decrypted = decrypt_eapol_key_data(sta->ptk.kek, ver, hdr,
|
|
&decrypted_len);
|
|
if (decrypted == NULL) {
|
|
wpa_printf(MSG_INFO, "Failed to decrypt EAPOL-Key Key Data");
|
|
return;
|
|
}
|
|
wpa_hexdump(MSG_DEBUG, "Decrypted EAPOL-Key Key Data",
|
|
decrypted, decrypted_len);
|
|
if (wt->write_pcap_dumper) {
|
|
/* Fill in a dummy Data frame header */
|
|
u8 buf[24 + 8 + sizeof(*eapol) + sizeof(*hdr)];
|
|
struct ieee80211_hdr *h;
|
|
struct wpa_eapol_key *k;
|
|
u8 *pos;
|
|
size_t plain_len;
|
|
|
|
plain_len = decrypted_len;
|
|
pos = decrypted;
|
|
while (pos + 1 < decrypted + decrypted_len) {
|
|
if (pos[0] == 0xdd && pos[1] == 0x00) {
|
|
/* Remove padding */
|
|
plain_len = pos - decrypted;
|
|
break;
|
|
}
|
|
pos += 2 + pos[1];
|
|
}
|
|
|
|
os_memset(buf, 0, sizeof(buf));
|
|
h = (struct ieee80211_hdr *) buf;
|
|
h->frame_control = host_to_le16(0x0208);
|
|
os_memcpy(h->addr1, dst, ETH_ALEN);
|
|
os_memcpy(h->addr2, src, ETH_ALEN);
|
|
os_memcpy(h->addr3, src, ETH_ALEN);
|
|
pos = (u8 *) (h + 1);
|
|
os_memcpy(pos, "\xaa\xaa\x03\x00\x00\x00\x88\x8e", 8);
|
|
pos += 8;
|
|
os_memcpy(pos, eapol, sizeof(*eapol));
|
|
pos += sizeof(*eapol);
|
|
os_memcpy(pos, hdr, sizeof(*hdr));
|
|
k = (struct wpa_eapol_key *) pos;
|
|
WPA_PUT_BE16(k->key_info,
|
|
key_info & ~WPA_KEY_INFO_ENCR_KEY_DATA);
|
|
WPA_PUT_BE16(k->key_data_length, plain_len);
|
|
write_pcap_decrypted(wt, buf, sizeof(buf),
|
|
decrypted, plain_len);
|
|
}
|
|
learn_kde_keys(bss, decrypted, decrypted_len, hdr->key_rsc);
|
|
os_free(decrypted);
|
|
}
|
|
|
|
|
|
static void rx_data_eapol_key_2_of_2(struct wlantest *wt, const u8 *dst,
|
|
const u8 *src, const u8 *data, size_t len)
|
|
{
|
|
struct wlantest_bss *bss;
|
|
struct wlantest_sta *sta;
|
|
const struct ieee802_1x_hdr *eapol;
|
|
const struct wpa_eapol_key *hdr;
|
|
u16 key_info;
|
|
|
|
wpa_printf(MSG_DEBUG, "EAPOL-Key 2/2 " MACSTR " -> " MACSTR,
|
|
MAC2STR(src), MAC2STR(dst));
|
|
bss = bss_get(wt, dst);
|
|
if (bss == NULL)
|
|
return;
|
|
sta = sta_get(bss, src);
|
|
if (sta == NULL)
|
|
return;
|
|
|
|
eapol = (const struct ieee802_1x_hdr *) data;
|
|
hdr = (const struct wpa_eapol_key *) (eapol + 1);
|
|
key_info = WPA_GET_BE16(hdr->key_info);
|
|
|
|
if (!sta->ptk_set) {
|
|
wpa_printf(MSG_DEBUG, "No PTK known to process EAPOL-Key 2/2");
|
|
return;
|
|
}
|
|
|
|
if (sta->ptk_set &&
|
|
check_mic(sta->ptk.kck, key_info & WPA_KEY_INFO_TYPE_MASK,
|
|
data, len) < 0) {
|
|
wpa_printf(MSG_INFO, "Mismatch in EAPOL-Key 2/2 MIC");
|
|
return;
|
|
}
|
|
wpa_printf(MSG_DEBUG, "Valid MIC found in EAPOL-Key 2/2");
|
|
}
|
|
|
|
|
|
static void rx_data_eapol_key(struct wlantest *wt, const u8 *dst,
|
|
const u8 *src, const u8 *data, size_t len,
|
|
int prot)
|
|
{
|
|
const struct ieee802_1x_hdr *eapol;
|
|
const struct wpa_eapol_key *hdr;
|
|
const u8 *key_data;
|
|
u16 key_info, key_length, ver, key_data_length;
|
|
|
|
eapol = (const struct ieee802_1x_hdr *) data;
|
|
hdr = (const struct wpa_eapol_key *) (eapol + 1);
|
|
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key",
|
|
(const u8 *) hdr, len - sizeof(*eapol));
|
|
if (len < sizeof(*hdr)) {
|
|
wpa_printf(MSG_INFO, "Too short EAPOL-Key frame from " MACSTR,
|
|
MAC2STR(src));
|
|
return;
|
|
}
|
|
|
|
if (hdr->type == EAPOL_KEY_TYPE_RC4) {
|
|
/* TODO: EAPOL-Key RC4 for WEP */
|
|
return;
|
|
}
|
|
|
|
if (hdr->type != EAPOL_KEY_TYPE_RSN &&
|
|
hdr->type != EAPOL_KEY_TYPE_WPA) {
|
|
wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key type %u",
|
|
hdr->type);
|
|
return;
|
|
}
|
|
|
|
key_info = WPA_GET_BE16(hdr->key_info);
|
|
key_length = WPA_GET_BE16(hdr->key_length);
|
|
key_data_length = WPA_GET_BE16(hdr->key_data_length);
|
|
key_data = (const u8 *) (hdr + 1);
|
|
if (key_data + key_data_length > data + len) {
|
|
wpa_printf(MSG_INFO, "Truncated EAPOL-Key from " MACSTR,
|
|
MAC2STR(src));
|
|
return;
|
|
}
|
|
if (key_data + key_data_length < data + len) {
|
|
wpa_hexdump(MSG_DEBUG, "Extra data after EAPOL-Key Key Data "
|
|
"field", key_data + key_data_length,
|
|
data + len - key_data - key_data_length);
|
|
}
|
|
|
|
|
|
ver = key_info & WPA_KEY_INFO_TYPE_MASK;
|
|
wpa_printf(MSG_DEBUG, "EAPOL-Key ver=%u %c idx=%u%s%s%s%s%s%s%s%s "
|
|
"datalen=%u",
|
|
ver, key_info & WPA_KEY_INFO_KEY_TYPE ? 'P' : 'G',
|
|
(key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
|
|
WPA_KEY_INFO_KEY_INDEX_SHIFT,
|
|
(key_info & WPA_KEY_INFO_INSTALL) ? " Install" : "",
|
|
(key_info & WPA_KEY_INFO_ACK) ? " ACK" : "",
|
|
(key_info & WPA_KEY_INFO_MIC) ? " MIC" : "",
|
|
(key_info & WPA_KEY_INFO_SECURE) ? " Secure" : "",
|
|
(key_info & WPA_KEY_INFO_ERROR) ? " Error" : "",
|
|
(key_info & WPA_KEY_INFO_REQUEST) ? " Request" : "",
|
|
(key_info & WPA_KEY_INFO_ENCR_KEY_DATA) ? " Encr" : "",
|
|
(key_info & WPA_KEY_INFO_SMK_MESSAGE) ? " SMK" : "",
|
|
key_data_length);
|
|
|
|
if (ver != WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 &&
|
|
ver != WPA_KEY_INFO_TYPE_HMAC_SHA1_AES &&
|
|
ver != WPA_KEY_INFO_TYPE_AES_128_CMAC) {
|
|
wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key Key Descriptor "
|
|
"Version %u", ver);
|
|
return;
|
|
}
|
|
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Replay Counter",
|
|
hdr->replay_counter, WPA_REPLAY_COUNTER_LEN);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Nonce",
|
|
hdr->key_nonce, WPA_NONCE_LEN);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key IV",
|
|
hdr->key_iv, 16);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key RSC",
|
|
hdr->key_rsc, WPA_KEY_RSC_LEN);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key MIC",
|
|
hdr->key_mic, 16);
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Key Key Data",
|
|
key_data, key_data_length);
|
|
|
|
if (key_info & (WPA_KEY_INFO_ERROR | WPA_KEY_INFO_REQUEST))
|
|
return;
|
|
|
|
if (key_info & WPA_KEY_INFO_SMK_MESSAGE)
|
|
return;
|
|
|
|
if (key_info & WPA_KEY_INFO_KEY_TYPE) {
|
|
/* 4-Way Handshake */
|
|
switch (key_info & (WPA_KEY_INFO_SECURE |
|
|
WPA_KEY_INFO_MIC |
|
|
WPA_KEY_INFO_ACK |
|
|
WPA_KEY_INFO_INSTALL)) {
|
|
case WPA_KEY_INFO_ACK:
|
|
rx_data_eapol_key_1_of_4(wt, dst, src, data, len);
|
|
break;
|
|
case WPA_KEY_INFO_MIC:
|
|
rx_data_eapol_key_2_of_4(wt, dst, src, data, len);
|
|
break;
|
|
case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
|
|
WPA_KEY_INFO_ACK | WPA_KEY_INFO_INSTALL:
|
|
rx_data_eapol_key_3_of_4(wt, dst, src, data, len);
|
|
break;
|
|
case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC:
|
|
rx_data_eapol_key_4_of_4(wt, dst, src, data, len);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key frame");
|
|
break;
|
|
}
|
|
} else {
|
|
/* Group Key Handshake */
|
|
switch (key_info & (WPA_KEY_INFO_SECURE |
|
|
WPA_KEY_INFO_MIC |
|
|
WPA_KEY_INFO_ACK)) {
|
|
case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
|
|
WPA_KEY_INFO_ACK:
|
|
rx_data_eapol_key_1_of_2(wt, dst, src, data, len);
|
|
break;
|
|
case WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC:
|
|
rx_data_eapol_key_2_of_2(wt, dst, src, data, len);
|
|
break;
|
|
default:
|
|
wpa_printf(MSG_DEBUG, "Unsupported EAPOL-Key frame");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void rx_data_eapol(struct wlantest *wt, const u8 *dst, const u8 *src,
|
|
const u8 *data, size_t len, int prot)
|
|
{
|
|
const struct ieee802_1x_hdr *hdr;
|
|
u16 length;
|
|
const u8 *p;
|
|
|
|
wpa_hexdump(MSG_EXCESSIVE, "EAPOL", data, len);
|
|
if (len < sizeof(*hdr)) {
|
|
wpa_printf(MSG_INFO, "Too short EAPOL frame from " MACSTR,
|
|
MAC2STR(src));
|
|
return;
|
|
}
|
|
|
|
hdr = (const struct ieee802_1x_hdr *) data;
|
|
length = be_to_host16(hdr->length);
|
|
wpa_printf(MSG_DEBUG, "RX EAPOL: " MACSTR " -> " MACSTR "%s ver=%u "
|
|
"type=%u len=%u",
|
|
MAC2STR(src), MAC2STR(dst), prot ? " Prot" : "",
|
|
hdr->version, hdr->type, length);
|
|
if (sizeof(*hdr) + length > len) {
|
|
wpa_printf(MSG_INFO, "Truncated EAPOL frame from " MACSTR,
|
|
MAC2STR(src));
|
|
return;
|
|
}
|
|
|
|
if (sizeof(*hdr) + length < len) {
|
|
wpa_printf(MSG_INFO, "EAPOL frame with %d extra bytes",
|
|
(int) (len - sizeof(*hdr) - length));
|
|
}
|
|
p = (const u8 *) (hdr + 1);
|
|
|
|
switch (hdr->type) {
|
|
case IEEE802_1X_TYPE_EAP_PACKET:
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL - EAP packet", p, length);
|
|
break;
|
|
case IEEE802_1X_TYPE_EAPOL_START:
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Start", p, length);
|
|
break;
|
|
case IEEE802_1X_TYPE_EAPOL_LOGOFF:
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL-Logoff", p, length);
|
|
break;
|
|
case IEEE802_1X_TYPE_EAPOL_KEY:
|
|
rx_data_eapol_key(wt, dst, src, data, sizeof(*hdr) + length,
|
|
prot);
|
|
break;
|
|
case IEEE802_1X_TYPE_EAPOL_ENCAPSULATED_ASF_ALERT:
|
|
wpa_hexdump(MSG_MSGDUMP, "EAPOL - Encapsulated ASF alert",
|
|
p, length);
|
|
break;
|
|
default:
|
|
wpa_hexdump(MSG_MSGDUMP, "Unknown EAPOL payload", p, length);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static void rx_data_eth(struct wlantest *wt, const u8 *dst, const u8 *src,
|
|
u16 ethertype, const u8 *data, size_t len, int prot)
|
|
{
|
|
if (ethertype == ETH_P_PAE)
|
|
rx_data_eapol(wt, dst, src, data, len, prot);
|
|
}
|
|
|
|
|
|
static void rx_data_process(struct wlantest *wt, const u8 *dst, const u8 *src,
|
|
const u8 *data, size_t len, int prot)
|
|
{
|
|
if (len == 0)
|
|
return;
|
|
|
|
if (len >= 8 && os_memcmp(data, "\xaa\xaa\x03\x00\x00\x00", 6) == 0) {
|
|
rx_data_eth(wt, dst, src, WPA_GET_BE16(data + 6),
|
|
data + 8, len - 8, prot);
|
|
return;
|
|
}
|
|
|
|
wpa_hexdump(MSG_DEBUG, "Unrecognized LLC", data, len > 8 ? 8 : len);
|
|
}
|
|
|
|
|
|
static void rx_data_bss_prot_group(struct wlantest *wt,
|
|
const struct ieee80211_hdr *hdr,
|
|
const u8 *qos, const u8 *dst, const u8 *src,
|
|
const u8 *data, size_t len)
|
|
{
|
|
struct wlantest_bss *bss;
|
|
int keyid;
|
|
u8 *decrypted;
|
|
size_t dlen;
|
|
u8 pn[6];
|
|
|
|
bss = bss_get(wt, hdr->addr2);
|
|
if (bss == NULL)
|
|
return;
|
|
if (len < 4) {
|
|
wpa_printf(MSG_INFO, "Too short group addressed data frame");
|
|
return;
|
|
}
|
|
|
|
keyid = data[3] >> 6;
|
|
if (bss->gtk_len[keyid] == 0) {
|
|
wpa_printf(MSG_MSGDUMP, "No GTK known to decrypt the frame "
|
|
"(A2=" MACSTR " KeyID=%d)",
|
|
MAC2STR(hdr->addr2), keyid);
|
|
return;
|
|
}
|
|
|
|
ccmp_get_pn(pn, data);
|
|
if (os_memcmp(pn, bss->rsc[keyid], 6) <= 0) {
|
|
wpa_printf(MSG_INFO, "CCMP/TKIP replay detected: SA=" MACSTR,
|
|
MAC2STR(hdr->addr2));
|
|
wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
|
|
wpa_hexdump(MSG_INFO, "RSC", bss->rsc[keyid], 6);
|
|
}
|
|
|
|
/* TODO: TKIP */
|
|
|
|
decrypted = ccmp_decrypt(bss->gtk[keyid], hdr, data, len, &dlen);
|
|
if (decrypted) {
|
|
rx_data_process(wt, dst, src, decrypted, dlen, 1);
|
|
os_memcpy(bss->rsc[keyid], pn, 6);
|
|
write_pcap_decrypted(wt, (const u8 *) hdr, 24 + (qos ? 2 : 0),
|
|
decrypted, dlen);
|
|
}
|
|
os_free(decrypted);
|
|
}
|
|
|
|
|
|
static void rx_data_bss_prot(struct wlantest *wt,
|
|
const struct ieee80211_hdr *hdr, const u8 *qos,
|
|
const u8 *dst, const u8 *src, const u8 *data,
|
|
size_t len)
|
|
{
|
|
struct wlantest_bss *bss;
|
|
struct wlantest_sta *sta;
|
|
int keyid;
|
|
u16 fc = le_to_host16(hdr->frame_control);
|
|
u8 *decrypted;
|
|
size_t dlen;
|
|
int tid;
|
|
u8 pn[6], *rsc;
|
|
|
|
if (hdr->addr1[0] & 0x01) {
|
|
rx_data_bss_prot_group(wt, hdr, qos, dst, src, data, len);
|
|
return;
|
|
}
|
|
|
|
if (fc & WLAN_FC_TODS) {
|
|
bss = bss_get(wt, hdr->addr1);
|
|
if (bss == NULL)
|
|
return;
|
|
sta = sta_get(bss, hdr->addr2);
|
|
} else {
|
|
bss = bss_get(wt, hdr->addr2);
|
|
if (bss == NULL)
|
|
return;
|
|
sta = sta_get(bss, hdr->addr1);
|
|
}
|
|
if (sta == NULL || !sta->ptk_set) {
|
|
wpa_printf(MSG_MSGDUMP, "No PTK known to decrypt the frame");
|
|
return;
|
|
}
|
|
|
|
if (len < 4) {
|
|
wpa_printf(MSG_INFO, "Too short encrypted data frame");
|
|
return;
|
|
}
|
|
|
|
keyid = data[3] >> 6;
|
|
if (keyid != 0) {
|
|
wpa_printf(MSG_INFO, "Unexpected non-zero KeyID %d in "
|
|
"individually addressed Data frame from " MACSTR,
|
|
keyid, MAC2STR(hdr->addr2));
|
|
}
|
|
|
|
if (qos)
|
|
tid = qos[0] & 0x0f;
|
|
else
|
|
tid = 0;
|
|
if (fc & WLAN_FC_TODS)
|
|
rsc = sta->rsc_tods[tid];
|
|
else
|
|
rsc = sta->rsc_fromds[tid];
|
|
|
|
|
|
ccmp_get_pn(pn, data);
|
|
if (os_memcmp(pn, rsc, 6) <= 0) {
|
|
wpa_printf(MSG_INFO, "CCMP/TKIP replay detected: SA=" MACSTR,
|
|
MAC2STR(hdr->addr2));
|
|
wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
|
|
wpa_hexdump(MSG_INFO, "RSC", rsc, 6);
|
|
}
|
|
|
|
/* TODO: TKIP */
|
|
|
|
decrypted = ccmp_decrypt(sta->ptk.tk1, hdr, data, len, &dlen);
|
|
if (decrypted) {
|
|
rx_data_process(wt, dst, src, decrypted, dlen, 1);
|
|
os_memcpy(rsc, pn, 6);
|
|
write_pcap_decrypted(wt, (const u8 *) hdr, 24 + (qos ? 2 : 0),
|
|
decrypted, dlen);
|
|
}
|
|
os_free(decrypted);
|
|
}
|
|
|
|
|
|
static void rx_data_bss(struct wlantest *wt, const struct ieee80211_hdr *hdr,
|
|
const u8 *qos, const u8 *dst, const u8 *src,
|
|
const u8 *data, size_t len)
|
|
{
|
|
u16 fc = le_to_host16(hdr->frame_control);
|
|
int prot = !!(fc & WLAN_FC_ISWEP);
|
|
|
|
if (qos) {
|
|
u8 ack = (qos[0] & 0x60) >> 5;
|
|
wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR
|
|
" len=%u%s tid=%u%s%s",
|
|
MAC2STR(src), MAC2STR(dst), (unsigned int) len,
|
|
prot ? " Prot" : "", qos[0] & 0x0f,
|
|
(qos[0] & 0x10) ? " EOSP" : "",
|
|
ack == 0 ? "" :
|
|
(ack == 1 ? " NoAck" :
|
|
(ack == 2 ? " NoExpAck" : " BA")));
|
|
} else {
|
|
wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR
|
|
" len=%u%s",
|
|
MAC2STR(src), MAC2STR(dst), (unsigned int) len,
|
|
prot ? " Prot" : "");
|
|
}
|
|
|
|
if (prot)
|
|
rx_data_bss_prot(wt, hdr, qos, dst, src, data, len);
|
|
else
|
|
rx_data_process(wt, dst, src, data, len, 0);
|
|
}
|
|
|
|
|
|
void rx_data(struct wlantest *wt, const u8 *data, size_t len)
|
|
{
|
|
const struct ieee80211_hdr *hdr;
|
|
u16 fc, stype;
|
|
size_t hdrlen;
|
|
const u8 *qos = NULL;
|
|
|
|
if (len < 24)
|
|
return;
|
|
|
|
hdr = (const struct ieee80211_hdr *) data;
|
|
fc = le_to_host16(hdr->frame_control);
|
|
stype = WLAN_FC_GET_STYPE(fc);
|
|
hdrlen = 24;
|
|
if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
|
|
(WLAN_FC_TODS | WLAN_FC_FROMDS))
|
|
hdrlen += ETH_ALEN;
|
|
if (stype & 0x08) {
|
|
qos = data + hdrlen;
|
|
hdrlen += 2;
|
|
}
|
|
if (len < hdrlen)
|
|
return;
|
|
wt->rx_data++;
|
|
|
|
switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
|
|
case 0:
|
|
wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s IBSS DA=" MACSTR " SA="
|
|
MACSTR " BSSID=" MACSTR,
|
|
data_stype(WLAN_FC_GET_STYPE(fc)),
|
|
fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
|
|
fc & WLAN_FC_ISWEP ? " Prot" : "",
|
|
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
|
|
MAC2STR(hdr->addr3));
|
|
break;
|
|
case WLAN_FC_FROMDS:
|
|
wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s FromDS DA=" MACSTR
|
|
" BSSID=" MACSTR " SA=" MACSTR,
|
|
data_stype(WLAN_FC_GET_STYPE(fc)),
|
|
fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
|
|
fc & WLAN_FC_ISWEP ? " Prot" : "",
|
|
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
|
|
MAC2STR(hdr->addr3));
|
|
rx_data_bss(wt, hdr, qos, hdr->addr1, hdr->addr2,
|
|
data + hdrlen, len - hdrlen);
|
|
break;
|
|
case WLAN_FC_TODS:
|
|
wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s ToDS BSSID=" MACSTR
|
|
" SA=" MACSTR " DA=" MACSTR,
|
|
data_stype(WLAN_FC_GET_STYPE(fc)),
|
|
fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
|
|
fc & WLAN_FC_ISWEP ? " Prot" : "",
|
|
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
|
|
MAC2STR(hdr->addr3));
|
|
rx_data_bss(wt, hdr, qos, hdr->addr3, hdr->addr2,
|
|
data + hdrlen, len - hdrlen);
|
|
break;
|
|
case WLAN_FC_TODS | WLAN_FC_FROMDS:
|
|
wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s WDS RA=" MACSTR " TA="
|
|
MACSTR " DA=" MACSTR " SA=" MACSTR,
|
|
data_stype(WLAN_FC_GET_STYPE(fc)),
|
|
fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
|
|
fc & WLAN_FC_ISWEP ? " Prot" : "",
|
|
MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
|
|
MAC2STR(hdr->addr3),
|
|
MAC2STR((const u8 *) (hdr + 1)));
|
|
break;
|
|
}
|
|
}
|