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Disable network block temporarily on authentication failures

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If 4-way handshake fails due to likely PSK failure or if EAP
authentication fails, disable the network block temporarily. Use longer
duration if multiple consecutive failures are seen.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-08-26 23:01:26 +03:00
parent 2af4d404a8
commit 00e5e3d509
9 changed files with 145 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/common/wpa_ctrl.h
View File

@ -48,6 +48,10 @@ extern "C" {
#define WPA_EVENT_EAP_SUCCESS "CTRL-EVENT-EAP-SUCCESS "
/** EAP authentication failed (EAP-Failure received) */
#define WPA_EVENT_EAP_FAILURE "CTRL-EVENT-EAP-FAILURE "
/** Network block temporarily disabled (e.g., due to authentication failure) */
#define WPA_EVENT_TEMP_DISABLED "CTRL-EVENT-SSID-TEMP-DISABLED "
/** Temporarily disabled network block re-enabled */
#define WPA_EVENT_REENABLED "CTRL-EVENT-SSID-REENABLED "
/** New scan results available */
#define WPA_EVENT_SCAN_RESULTS "CTRL-EVENT-SCAN-RESULTS "
/** wpa_supplicant state change */

8
src/eapol_supp/eapol_supp_sm.c
View File

@ -1920,3 +1920,11 @@ void eapol_sm_set_ext_pw_ctx(struct eapol_sm *sm,
if (sm && sm->eap)
eap_sm_set_ext_pw_ctx(sm->eap, ext);
}
int eapol_sm_failed(struct eapol_sm *sm)
{
if (sm == NULL)
return 0;
return !sm->eapSuccess && sm->eapFail;
}

5
src/eapol_supp/eapol_supp_sm.h
View File

@ -278,6 +278,7 @@ void eapol_sm_invalidate_cached_session(struct eapol_sm *sm);
const char * eapol_sm_get_method_name(struct eapol_sm *sm);
void eapol_sm_set_ext_pw_ctx(struct eapol_sm *sm,
struct ext_password_data *ext);
int eapol_sm_failed(struct eapol_sm *sm);
#else /* IEEE8021X_EAPOL */
static inline struct eapol_sm *eapol_sm_init(struct eapol_ctx *ctx)
{
@ -373,6 +374,10 @@ static inline void eapol_sm_set_ext_pw_ctx(struct eapol_sm *sm,
struct ext_password_data *ext)
{
}
static inline int eapol_sm_failed(struct eapol_sm *sm)
{
return 0;
}
#endif /* IEEE8021X_EAPOL */
#endif /* EAPOL_SUPP_SM_H */

10
wpa_supplicant/config_ssid.h
View File

@ -519,6 +519,16 @@ struct wpa_ssid {
* By default: 2
*/
int dtim_period;
/**
* auth_failures - Number of consecutive authentication failures
*/
unsigned int auth_failures;
/**
* disabled_until - Network block disabled until this time if non-zero
*/
struct os_time disabled_until;
};
#endif /* CONFIG_SSID_H */

4
wpa_supplicant/ctrl_iface.c
View File

@ -1362,10 +1362,12 @@ static int wpa_supplicant_ctrl_iface_list_networks(
if (ret < 0 || ret >= end - pos)
return pos - buf;
pos += ret;
ret = os_snprintf(pos, end - pos, "\t%s%s%s",
ret = os_snprintf(pos, end - pos, "\t%s%s%s%s",
ssid == wpa_s->current_ssid ?
"[CURRENT]" : "",
ssid->disabled ? "[DISABLED]" : "",
ssid->disabled_until.sec ?
"[TEMP-DISABLED]" : "",
ssid->disabled == 2 ? "[P2P-PERSISTENT]" :
"");
if (ret < 0 || ret >= end - pos)

40
wpa_supplicant/events.c
View File

@ -43,9 +43,28 @@
#include "offchannel.h"
static int wpas_temp_disabled(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid)
{
struct os_time now;
if (ssid == NULL || ssid->disabled_until.sec == 0)
return 0;
os_get_time(&now);
if (ssid->disabled_until.sec > now.sec)
return ssid->disabled_until.sec - now.sec;
wpas_clear_temp_disabled(wpa_s, ssid, 0);
return 0;
}
static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s)
{
struct wpa_ssid *ssid, *old_ssid;
int res;
if (wpa_s->conf->ap_scan == 1 && wpa_s->current_ssid)
return 0;
@ -64,6 +83,13 @@ static int wpa_supplicant_select_config(struct wpa_supplicant *wpa_s)
return -1;
}
res = wpas_temp_disabled(wpa_s, ssid);
if (res > 0) {
wpa_dbg(wpa_s, MSG_DEBUG, "Selected network is temporarily "
"disabled for %d second(s)", res);
return -1;
}
wpa_dbg(wpa_s, MSG_DEBUG, "Network configuration found for the "
"current AP");
if (wpa_key_mgmt_wpa_any(ssid->key_mgmt)) {
@ -652,12 +678,20 @@ static struct wpa_ssid * wpa_scan_res_match(struct wpa_supplicant *wpa_s,
for (ssid = group; ssid; ssid = ssid->pnext) {
int check_ssid = wpa ? 1 : (ssid->ssid_len != 0);
int res;
if (wpas_network_disabled(wpa_s, ssid)) {
wpa_dbg(wpa_s, MSG_DEBUG, " skip - disabled");
continue;
}
res = wpas_temp_disabled(wpa_s, ssid);
if (res > 0) {
wpa_dbg(wpa_s, MSG_DEBUG, " skip - disabled "
"temporarily for %d second(s)", res);
continue;
}
#ifdef CONFIG_WPS
if ((ssid->key_mgmt & WPA_KEY_MGMT_WPS) && e && e->count > 0) {
wpa_dbg(wpa_s, MSG_DEBUG, " skip - blacklisted "
@ -1735,6 +1769,7 @@ static void wpa_supplicant_event_disassoc(struct wpa_supplicant *wpa_s,
wpa_key_mgmt_wpa_psk(wpa_s->key_mgmt)) {
wpa_msg(wpa_s, MSG_INFO, "WPA: 4-Way Handshake failed - "
"pre-shared key may be incorrect");
wpas_auth_failed(wpa_s);
}
if (!wpa_s->auto_reconnect_disabled ||
wpa_s->key_mgmt == WPA_KEY_MGMT_WPS) {
@ -2306,6 +2341,11 @@ void wpa_supplicant_event(void *ctx, enum wpa_event_type event,
#endif /* CONFIG_AP */
wpa_supplicant_event_disassoc(wpa_s, reason_code,
locally_generated);
if (reason_code == WLAN_REASON_IEEE_802_1X_AUTH_FAILED ||
((wpa_key_mgmt_wpa_ieee8021x(wpa_s->key_mgmt) ||
(wpa_s->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA)) &&
eapol_sm_failed(wpa_s->eapol)))
wpas_auth_failed(wpa_s);
#ifdef CONFIG_P2P
if (event == EVENT_DEAUTH && data) {
wpas_p2p_deauth_notif(wpa_s, data->deauth_info.addr,

69
wpa_supplicant/wpa_supplicant.c
View File

@ -648,6 +648,7 @@ void wpa_supplicant_set_state(struct wpa_supplicant *wpa_s,
ssid ? ssid->id : -1,
ssid && ssid->id_str ? ssid->id_str : "");
#endif /* CONFIG_CTRL_IFACE || !CONFIG_NO_STDOUT_DEBUG */
wpas_clear_temp_disabled(wpa_s, ssid, 1);
wpa_s->new_connection = 0;
wpa_s->reassociated_connection = 1;
wpa_drv_set_operstate(wpa_s, 1);
@ -1723,6 +1724,8 @@ void wpa_supplicant_enable_network(struct wpa_supplicant *wpa_s,
was_disabled = other_ssid->disabled;
other_ssid->disabled = 0;
if (was_disabled)
wpas_clear_temp_disabled(wpa_s, other_ssid, 0);
if (was_disabled != other_ssid->disabled)
wpas_notify_network_enabled_changed(
@ -1743,6 +1746,7 @@ void wpa_supplicant_enable_network(struct wpa_supplicant *wpa_s,
was_disabled = ssid->disabled;
ssid->disabled = 0;
wpas_clear_temp_disabled(wpa_s, ssid, 1);
if (was_disabled != ssid->disabled)
wpas_notify_network_enabled_changed(wpa_s, ssid);
@ -1813,6 +1817,9 @@ void wpa_supplicant_select_network(struct wpa_supplicant *wpa_s,
disconnected = 1;
}
if (ssid)
wpas_clear_temp_disabled(wpa_s, ssid, 1);
/*
* Mark all other networks disabled or mark all networks enabled if no
* network specified.
@ -1824,6 +1831,8 @@ void wpa_supplicant_select_network(struct wpa_supplicant *wpa_s,
continue; /* do not change persistent P2P group data */
other_ssid->disabled = ssid ? (ssid->id != other_ssid->id) : 0;
if (was_disabled && !other_ssid->disabled)
wpas_clear_temp_disabled(wpa_s, other_ssid, 0);
if (was_disabled != other_ssid->disabled)
wpas_notify_network_enabled_changed(wpa_s, other_ssid);
@ -3543,3 +3552,63 @@ int wpas_is_p2p_prioritized(struct wpa_supplicant *wpa_s)
return 0;
return -1;
}
void wpas_auth_failed(struct wpa_supplicant *wpa_s)
{
struct wpa_ssid *ssid = wpa_s->current_ssid;
int dur;
struct os_time now;
if (ssid == NULL) {
wpa_printf(MSG_DEBUG, "Authentication failure but no known "
"SSID block");
return;
}
if (ssid->key_mgmt == WPA_KEY_MGMT_WPS)
return;
ssid->auth_failures++;
if (ssid->auth_failures > 50)
dur = 300;
else if (ssid->auth_failures > 20)
dur = 120;
else if (ssid->auth_failures > 10)
dur = 60;
else if (ssid->auth_failures > 5)
dur = 30;
else if (ssid->auth_failures > 1)
dur = 20;
else
dur = 10;
os_get_time(&now);
if (now.sec + dur <= ssid->disabled_until.sec)
return;
ssid->disabled_until.sec = now.sec + dur;
wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_TEMP_DISABLED
"id=%d ssid=\"%s\" auth_failures=%u duration=%d",
ssid->id, wpa_ssid_txt(ssid->ssid, ssid->ssid_len),
ssid->auth_failures, dur);
}
void wpas_clear_temp_disabled(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid, int clear_failures)
{
if (ssid == NULL)
return;
if (ssid->disabled_until.sec) {
wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_REENABLED
"id=%d ssid=\"%s\"",
ssid->id, wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
}
ssid->disabled_until.sec = 0;
ssid->disabled_until.usec = 0;
if (clear_failures)
ssid->auth_failures = 0;
}

3
wpa_supplicant/wpa_supplicant_i.h
View File

@ -652,6 +652,9 @@ void wpa_supplicant_clear_status(struct wpa_supplicant *wpa_s);
void wpas_connection_failed(struct wpa_supplicant *wpa_s, const u8 *bssid);
int wpas_driver_bss_selection(struct wpa_supplicant *wpa_s);
int wpas_is_p2p_prioritized(struct wpa_supplicant *wpa_s);
void wpas_auth_failed(struct wpa_supplicant *wpa_s);
void wpas_clear_temp_disabled(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid, int clear_failures);
void wpa_supplicant_proc_40mhz_intolerant(struct wpa_supplicant *wpa_s);
/**

3
wpa_supplicant/wps_supplicant.c
View File

@ -267,6 +267,9 @@ static int wpa_supplicant_wps_cred(void *ctx,
ssid->temporary = 0;
ssid->bssid_set = 0;
}
ssid->disabled_until.sec = 0;
ssid->disabled_until.usec = 0;
ssid->auth_failures = 0;
} else {
wpa_printf(MSG_DEBUG, "WPS: Create a new network based on the "
"received credential");