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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.settings.vpn2;
     17 
     18 import android.content.Context;
     19 import android.net.ConnectivityManager;
     20 import android.net.IConnectivityManager;
     21 import android.os.RemoteException;
     22 import android.os.ServiceManager;
     23 import android.provider.Settings;
     24 import android.security.Credentials;
     25 import android.security.KeyStore;
     26 import android.util.Log;
     27 
     28 import com.android.internal.net.LegacyVpnInfo;
     29 import com.android.internal.net.VpnConfig;
     30 
     31 /**
     32  * Utility functions for vpn.
     33  *
     34  * Keystore methods should only be called in system user
     35  */
     36 public class VpnUtils {
     37 
     38     private static final String TAG = "VpnUtils";
     39 
     40     public static String getLockdownVpn() {
     41         final byte[] value = KeyStore.getInstance().get(Credentials.LOCKDOWN_VPN);
     42         return value == null ? null : new String(value);
     43     }
     44 
     45     public static void clearLockdownVpn(Context context) {
     46         KeyStore.getInstance().delete(Credentials.LOCKDOWN_VPN);
     47         // Always notify ConnectivityManager after keystore update
     48         getConnectivityManager(context).updateLockdownVpn();
     49     }
     50 
     51     public static void setLockdownVpn(Context context, String lockdownKey) {
     52         KeyStore.getInstance().put(Credentials.LOCKDOWN_VPN, lockdownKey.getBytes(),
     53                 KeyStore.UID_SELF, /* flags */ 0);
     54         // Always notify ConnectivityManager after keystore update
     55         getConnectivityManager(context).updateLockdownVpn();
     56     }
     57 
     58     public static boolean isVpnLockdown(String key) {
     59         return key.equals(getLockdownVpn());
     60     }
     61 
     62     public static boolean isAnyLockdownActive(Context context) {
     63         final int userId = context.getUserId();
     64         if (getLockdownVpn() != null) {
     65             return true;
     66         }
     67         return getConnectivityManager(context).getAlwaysOnVpnPackageForUser(userId) != null
     68                 && Settings.Secure.getIntForUser(context.getContentResolver(),
     69                         Settings.Secure.ALWAYS_ON_VPN_LOCKDOWN, /* default */ 0, userId) != 0;
     70     }
     71 
     72     public static boolean isVpnActive(Context context) throws RemoteException {
     73         return getIConnectivityManager().getVpnConfig(context.getUserId()) != null;
     74     }
     75 
     76     public static String getConnectedPackage(IConnectivityManager service, final int userId)
     77             throws RemoteException {
     78         final VpnConfig config = service.getVpnConfig(userId);
     79         return config != null ? config.user : null;
     80     }
     81 
     82     private static ConnectivityManager getConnectivityManager(Context context) {
     83         return context.getSystemService(ConnectivityManager.class);
     84     }
     85 
     86     private static IConnectivityManager getIConnectivityManager() {
     87         return IConnectivityManager.Stub.asInterface(
     88                 ServiceManager.getService(Context.CONNECTIVITY_SERVICE));
     89     }
     90 
     91     public static boolean isAlwaysOnVpnSet(ConnectivityManager cm, final int userId) {
     92         return cm.getAlwaysOnVpnPackageForUser(userId) != null;
     93     }
     94 
     95     public static boolean disconnectLegacyVpn(Context context) {
     96         try {
     97             int userId = context.getUserId();
     98             IConnectivityManager connectivityService = getIConnectivityManager();
     99             LegacyVpnInfo currentLegacyVpn = connectivityService.getLegacyVpnInfo(userId);
    100             if (currentLegacyVpn != null) {
    101                 clearLockdownVpn(context);
    102                 connectivityService.prepareVpn(null, VpnConfig.LEGACY_VPN, userId);
    103                 return true;
    104             }
    105         } catch (RemoteException e) {
    106             Log.e(TAG, "Legacy VPN could not be disconnected", e);
    107         }
    108         return false;
    109     }
    110 }
    111