| Dmitry Shmidt | 8d520ff | 2011-05-09 14:06:53 -0700 | [diff] [blame^] | 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 "utils/includes.h" |
| 16 | |
| 17 | #include "utils/common.h" |
| 18 | #include "utils/eloop.h" |
| 19 | #include "common/ieee802_11_defs.h" |
| 20 | #include "hostapd.h" |
| 21 | #include "sta_info.h" |
| 22 | #include "ap_mlme.h" |
| 23 | #include "wpa_auth.h" |
| 24 | #include "ap_drv_ops.h" |
| 25 | #include "tkip_countermeasures.h" |
| 26 | |
| 27 | |
| 28 | static void ieee80211_tkip_countermeasures_stop(void *eloop_ctx, |
| 29 | void *timeout_ctx) |
| 30 | { |
| 31 | struct hostapd_data *hapd = eloop_ctx; |
| 32 | hapd->tkip_countermeasures = 0; |
| 33 | hostapd_drv_set_countermeasures(hapd, 0); |
| 34 | hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211, |
| 35 | HOSTAPD_LEVEL_INFO, "TKIP countermeasures ended"); |
| 36 | } |
| 37 | |
| 38 | |
| 39 | static void ieee80211_tkip_countermeasures_start(struct hostapd_data *hapd) |
| 40 | { |
| 41 | struct sta_info *sta; |
| 42 | |
| 43 | hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211, |
| 44 | HOSTAPD_LEVEL_INFO, "TKIP countermeasures initiated"); |
| 45 | |
| 46 | wpa_auth_countermeasures_start(hapd->wpa_auth); |
| 47 | hapd->tkip_countermeasures = 1; |
| 48 | hostapd_drv_set_countermeasures(hapd, 1); |
| 49 | wpa_gtk_rekey(hapd->wpa_auth); |
| 50 | eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL); |
| 51 | eloop_register_timeout(60, 0, ieee80211_tkip_countermeasures_stop, |
| 52 | hapd, NULL); |
| 53 | for (sta = hapd->sta_list; sta != NULL; sta = sta->next) { |
| 54 | hostapd_drv_sta_deauth(hapd, sta->addr, |
| 55 | WLAN_REASON_MICHAEL_MIC_FAILURE); |
| 56 | ap_sta_set_authorized(hapd, sta, 0); |
| 57 | sta->flags &= ~(WLAN_STA_AUTH | WLAN_STA_ASSOC); |
| 58 | hostapd_drv_sta_remove(hapd, sta->addr); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | |
| 63 | void michael_mic_failure(struct hostapd_data *hapd, const u8 *addr, int local) |
| 64 | { |
| 65 | time_t now; |
| 66 | |
| 67 | if (addr && local) { |
| 68 | struct sta_info *sta = ap_get_sta(hapd, addr); |
| 69 | if (sta != NULL) { |
| 70 | wpa_auth_sta_local_mic_failure_report(sta->wpa_sm); |
| 71 | hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211, |
| 72 | HOSTAPD_LEVEL_INFO, |
| 73 | "Michael MIC failure detected in " |
| 74 | "received frame"); |
| 75 | mlme_michaelmicfailure_indication(hapd, addr); |
| 76 | } else { |
| 77 | wpa_printf(MSG_DEBUG, |
| 78 | "MLME-MICHAELMICFAILURE.indication " |
| 79 | "for not associated STA (" MACSTR |
| 80 | ") ignored", MAC2STR(addr)); |
| 81 | return; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | time(&now); |
| 86 | if (now > hapd->michael_mic_failure + 60) { |
| 87 | hapd->michael_mic_failures = 1; |
| 88 | } else { |
| 89 | hapd->michael_mic_failures++; |
| 90 | if (hapd->michael_mic_failures > 1) |
| 91 | ieee80211_tkip_countermeasures_start(hapd); |
| 92 | } |
| 93 | hapd->michael_mic_failure = now; |
| 94 | } |