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
ieee80211_tkip_countermeasures_stop(void * eloop_ctx,void * timeout_ctx)23 static 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
ieee80211_tkip_countermeasures_start(struct hostapd_data * hapd)34 static 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
ieee80211_tkip_countermeasures_deinit(struct hostapd_data * hapd)63 void ieee80211_tkip_countermeasures_deinit(struct hostapd_data *hapd)
64 {
65 eloop_cancel_timeout(ieee80211_tkip_countermeasures_stop, hapd, NULL);
66 }
67
68
michael_mic_failure(struct hostapd_data * hapd,const u8 * addr,int local)69 int michael_mic_failure(struct hostapd_data *hapd, const u8 *addr, int local)
70 {
71 struct os_reltime now;
72 int ret = 0;
73
74 hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
75 HOSTAPD_LEVEL_INFO,
76 "Michael MIC failure detected in received frame%s",
77 local ? " (local)" : "");
78
79 if (addr && local) {
80 struct sta_info *sta = ap_get_sta(hapd, addr);
81 if (sta != NULL) {
82 wpa_auth_sta_local_mic_failure_report(sta->wpa_sm);
83 hostapd_logger(hapd, addr, HOSTAPD_MODULE_IEEE80211,
84 HOSTAPD_LEVEL_INFO,
85 "Michael MIC failure detected in "
86 "received frame");
87 mlme_michaelmicfailure_indication(hapd, addr);
88 } else {
89 wpa_printf(MSG_DEBUG,
90 "MLME-MICHAELMICFAILURE.indication "
91 "for not associated STA (" MACSTR
92 ") ignored", MAC2STR(addr));
93 return ret;
94 }
95 }
96
97 os_get_reltime(&now);
98 if (os_reltime_expired(&now, &hapd->michael_mic_failure, 60)) {
99 hapd->michael_mic_failures = 1;
100 } else {
101 hapd->michael_mic_failures++;
102 if (hapd->michael_mic_failures > 1) {
103 ieee80211_tkip_countermeasures_start(hapd);
104 ret = 1;
105 }
106 }
107 hapd->michael_mic_failure = now;
108
109 return ret;
110 }
111
