92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
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/*
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* hostapd / TKIP countermeasures
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* Copyright (c) 2002-2009, 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 "includes.h"
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#include "hostapd.h"
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#include "eloop.h"
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#include "driver_i.h"
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#include "sta_info.h"
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#include "mlme.h"
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#include "wpa.h"
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static void ieee80211_tkip_countermeasures_stop(void *eloop_ctx,
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void *timeout_ctx)
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{
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struct hostapd_data *hapd = eloop_ctx;
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hapd->tkip_countermeasures = 0;
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hostapd_set_countermeasures(hapd, 0);
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hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
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HOSTAPD_LEVEL_INFO, "TKIP countermeasures ended");
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}
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static void ieee80211_tkip_countermeasures_start(struct hostapd_data *hapd)
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{
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struct sta_info *sta;
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hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
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HOSTAPD_LEVEL_INFO, "TKIP countermeasures initiated");
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wpa_auth_countermeasures_start(hapd->wpa_auth);
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hapd->tkip_countermeasures = 1;
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hostapd_set_countermeasures(hapd, 1);
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wpa_gtk_rekey(hapd->wpa_auth);
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eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
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eloop_register_timeout(60, 0, ieee80211_tkip_countermeasures_stop,
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hapd, NULL);
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for (sta = hapd->sta_list; sta != NULL; sta = sta->next) {
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hostapd_sta_deauth(hapd, sta->addr,
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WLAN_REASON_MICHAEL_MIC_FAILURE);
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sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC |
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WLAN_STA_AUTHORIZED);
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hostapd_sta_remove(hapd, sta->addr);
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}
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}
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void michael_mic_failure(struct hostapd_data *hapd, const u8 *addr, int local)
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{
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time_t now;
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if (addr && local) {
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struct sta_info *sta = ap_get_sta(hapd, addr);
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if (sta != NULL) {
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wpa_auth_sta_local_mic_failure_report(sta->wpa_sm);
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hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
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HOSTAPD_LEVEL_INFO,
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"Michael MIC failure detected in "
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"received frame");
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mlme_michaelmicfailure_indication(hapd, addr);
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} else {
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wpa_printf(MSG_DEBUG,
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"MLME-MICHAELMICFAILURE.indication "
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"for not associated STA (" MACSTR
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") ignored", MAC2STR(addr));
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return;
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}
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}
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time(&now);
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if (now > hapd->michael_mic_failure + 60) {
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hapd->michael_mic_failures = 1;
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} else {
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hapd->michael_mic_failures++;
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if (hapd->michael_mic_failures > 1)
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ieee80211_tkip_countermeasures_start(hapd);
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}
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hapd->michael_mic_failure = now;
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}
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