106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/*
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* hostapd / TKIP countermeasures
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* Copyright (c) 2002-2012, Jouni Malinen <j@w1.fi>
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*
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* This software may be distributed under the terms of the BSD license.
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* See README 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 "utils/eloop.h"
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#include "common/ieee802_11_defs.h"
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#include "radius/radius.h"
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#include "hostapd.h"
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#include "sta_info.h"
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#include "ap_mlme.h"
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#include "wpa_auth.h"
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#include "ap_drv_ops.h"
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#include "tkip_countermeasures.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_drv_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_drv_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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while ((sta = hapd->sta_list)) {
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sta->acct_terminate_cause =
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RADIUS_ACCT_TERMINATE_CAUSE_ADMIN_RESET;
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if (sta->flags & WLAN_STA_AUTH) {
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mlme_deauthenticate_indication(
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hapd, sta,
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WLAN_REASON_MICHAEL_MIC_FAILURE);
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}
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hostapd_drv_sta_deauth(hapd, sta->addr,
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WLAN_REASON_MICHAEL_MIC_FAILURE);
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ap_free_sta(hapd, sta);
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}
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}
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void ieee80211_tkip_countermeasures_deinit(struct hostapd_data *hapd)
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{
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eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
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}
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int michael_mic_failure(struct hostapd_data *hapd, const u8 *addr, int local)
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{
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struct os_reltime now;
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int ret = 0;
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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 ret;
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}
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}
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os_get_reltime(&now);
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if (os_reltime_expired(&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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ret = 1;
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}
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}
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hapd->michael_mic_failure = now;
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return ret;
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}
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