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