/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.settings.vpn2;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.IConnectivityManager;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.security.Credentials;
import android.security.KeyStore;
import android.util.Log;
import com.android.internal.net.LegacyVpnInfo;
import com.android.internal.net.VpnConfig;
/**
* Utility functions for vpn.
*
* Keystore methods should only be called in system user
*/
public class VpnUtils {
private static final String TAG = "VpnUtils";
public static String getLockdownVpn() {
final byte[] value = KeyStore.getInstance().get(Credentials.LOCKDOWN_VPN);
return value == null ? null : new String(value);
}
public static void clearLockdownVpn(Context context) {
KeyStore.getInstance().delete(Credentials.LOCKDOWN_VPN);
// Always notify ConnectivityManager after keystore update
context.getSystemService(ConnectivityManager.class).updateLockdownVpn();
}
public static void setLockdownVpn(Context context, String lockdownKey) {
KeyStore.getInstance().put(Credentials.LOCKDOWN_VPN, lockdownKey.getBytes(),
KeyStore.UID_SELF, /* flags */ 0);
// Always notify ConnectivityManager after keystore update
context.getSystemService(ConnectivityManager.class).updateLockdownVpn();
}
public static boolean isVpnLockdown(String key) {
return key.equals(getLockdownVpn());
}
public static boolean disconnectLegacyVpn(Context context) {
try {
int userId = context.getUserId();
IConnectivityManager connectivityService = IConnectivityManager.Stub
.asInterface(ServiceManager.getService(Context.CONNECTIVITY_SERVICE));
LegacyVpnInfo currentLegacyVpn = connectivityService.getLegacyVpnInfo(userId);
if (currentLegacyVpn != null) {
clearLockdownVpn(context);
connectivityService.prepareVpn(null, VpnConfig.LEGACY_VPN, userId);
return true;
}
} catch (RemoteException e) {
Log.e(TAG, "Legacy VPN could not be disconnected", e);
}
return false;
}
}