tkip_countermeasures.c revision d5e4923d04122f81300fa68fb07d64ede28fd44d 
1/*
2 * hostapd / TKIP countermeasures
3 * Copyright (c) 2002-2012, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9#include "utils/includes.h"
10
11#include "utils/common.h"
12#include "utils/eloop.h"
13#include "common/ieee802_11_defs.h"
14#include "radius/radius.h"
15#include "hostapd.h"
16#include "sta_info.h"
17#include "ap_mlme.h"
18#include "wpa_auth.h"
19#include "ap_drv_ops.h"
20#include "tkip_countermeasures.h"
21
22
23static void ieee80211_tkip_countermeasures_stop(void *eloop_ctx,
24						void *timeout_ctx)
25{
26	struct hostapd_data *hapd = eloop_ctx;
27	hapd->tkip_countermeasures = 0;
28	hostapd_drv_set_countermeasures(hapd, 0);
29	hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
30		       HOSTAPD_LEVEL_INFO, "TKIP countermeasures ended");
31}
32
33
34static void ieee80211_tkip_countermeasures_start(struct hostapd_data *hapd)
35{
36	struct sta_info *sta;
37
38	hostapd_logger(hapd, NULL, HOSTAPD_MODULE_IEEE80211,
39		       HOSTAPD_LEVEL_INFO, "TKIP countermeasures initiated");
40
41	wpa_auth_countermeasures_start(hapd->wpa_auth);
42	hapd->tkip_countermeasures = 1;
43	hostapd_drv_set_countermeasures(hapd, 1);
44	wpa_gtk_rekey(hapd->wpa_auth);
45	eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
46	eloop_register_timeout(60, 0, ieee80211_tkip_countermeasures_stop,
47			       hapd, NULL);
48	while ((sta = hapd->sta_list)) {
49		sta->acct_terminate_cause =
50			RADIUS_ACCT_TERMINATE_CAUSE_ADMIN_RESET;
51		if (sta->flags & WLAN_STA_AUTH) {
52			mlme_deauthenticate_indication(
53				hapd, sta,
54				WLAN_REASON_MICHAEL_MIC_FAILURE);
55		}
56		hostapd_drv_sta_deauth(hapd, sta->addr,
57				       WLAN_REASON_MICHAEL_MIC_FAILURE);
58		ap_free_sta(hapd, sta);
59	}
60}
61
62
63void ieee80211_tkip_countermeasures_deinit(struct hostapd_data *hapd)
64{
65	eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
66}
67
68
69int michael_mic_failure(struct hostapd_data *hapd, const u8 *addr, int local)
70{
71	struct os_time now;
72	int ret = 0;
73
74	if (addr && local) {
75		struct sta_info *sta = ap_get_sta(hapd, addr);
76		if (sta != NULL) {
77			wpa_auth_sta_local_mic_failure_report(sta->wpa_sm);
78			hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
79				       HOSTAPD_LEVEL_INFO,
80				       "Michael MIC failure detected in "
81				       "received frame");
82			mlme_michaelmicfailure_indication(hapd, addr);
83		} else {
84			wpa_printf(MSG_DEBUG,
85				   "MLME-MICHAELMICFAILURE.indication "
86				   "for not associated STA (" MACSTR
87				   ") ignored", MAC2STR(addr));
88			return ret;
89		}
90	}
91
92	os_get_time(&now);
93	if (now.sec > hapd->michael_mic_failure + 60) {
94		hapd->michael_mic_failures = 1;
95	} else {
96		hapd->michael_mic_failures++;
97		if (hapd->michael_mic_failures > 1) {
98			ieee80211_tkip_countermeasures_start(hapd);
99			ret = 1;
100		}
101	}
102	hapd->michael_mic_failure = now.sec;
103
104	return ret;
105}
106