hostapd/tkip_countermeasures.c

   1 /*
   2  * hostapd / TKIP countermeasures
   3  * Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
   4  *
   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.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "hostapd.h"
  18 #include "eloop.h"
  19 #include "driver_i.h"
  20 #include "sta_info.h"
  21 #include "mlme.h"
  22 #include "wpa.h"
  23
  24
  25 static void ieee80211_tkip_countermeasures_stop(void *eloop_ctx,
  26                                                 void *timeout_ctx)
  27 {
  28         struct hostapd_data *hapd = eloop_ctx;
  29         hapd->tkip_countermeasures = 0;
  30         hostapd_set_countermeasures(hapd, 0);
  31         hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
  32                        HOSTAPD_LEVEL_INFO, "TKIP countermeasures ended");
  33 }
  34
  35
  36 static void ieee80211_tkip_countermeasures_start(struct hostapd_data *hapd)
  37 {
  38         struct sta_info *sta;
  39
  40         hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
  41                        HOSTAPD_LEVEL_INFO, "TKIP countermeasures initiated");
  42
  43         wpa_auth_countermeasures_start(hapd->wpa_auth);
  44         hapd->tkip_countermeasures = 1;
  45         hostapd_set_countermeasures(hapd, 1);
  46         wpa_gtk_rekey(hapd->wpa_auth);
  47         eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
  48         eloop_register_timeout(60, 0, ieee80211_tkip_countermeasures_stop,
  49                                hapd, NULL);
  50         for (sta = hapd->sta_list; sta != NULL; sta = sta->next) {
  51                 hostapd_sta_deauth(hapd, sta->addr,
  52                                    WLAN_REASON_MICHAEL_MIC_FAILURE);
  53                 sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC |
  54                                 WLAN_STA_AUTHORIZED);
  55                 hostapd_sta_remove(hapd, sta->addr);
  56         }
  57 }
  58
  59
  60 void michael_mic_failure(struct hostapd_data *hapd, const u8 *addr, int local)
  61 {
  62         time_t now;
  63
  64         if (addr && local) {
  65                 struct sta_info *sta = ap_get_sta(hapd, addr);
  66                 if (sta != NULL) {
  67                         wpa_auth_sta_local_mic_failure_report(sta->wpa_sm);
  68                         hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
  69                                        HOSTAPD_LEVEL_INFO,
  70                                        "Michael MIC failure detected in "
  71                                        "received frame");
  72                         mlme_michaelmicfailure_indication(hapd, addr);
  73                 } else {
  74                         wpa_printf(MSG_DEBUG,
  75                                    "MLME-MICHAELMICFAILURE.indication "
  76                                    "for not associated STA (" MACSTR
  77                                    ") ignored", MAC2STR(addr));
  78                         return;
  79                 }
  80         }
  81
  82         time(&now);
  83         if (now > hapd->michael_mic_failure + 60) {
  84                 hapd->michael_mic_failures = 1;
  85         } else {
  86                 hapd->michael_mic_failures++;
  87                 if (hapd->michael_mic_failures > 1)
  88                         ieee80211_tkip_countermeasures_start(hapd);
  89         }
  90         hapd->michael_mic_failure = now;
  91 }