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.security.Credentials;
21 import android.security.KeyStore;
22 
23 /**
24  * Utility functions for vpn.
25  *
26  * Keystore methods should only be called in system user
27  */
28 public class VpnUtils {
29 
getLockdownVpn()30     public static String getLockdownVpn() {
31         final byte[] value = KeyStore.getInstance().get(Credentials.LOCKDOWN_VPN);
32         return value == null ? null : new String(value);
33     }
34 
clearLockdownVpn(Context context)35     public static void clearLockdownVpn(Context context) {
36         KeyStore.getInstance().delete(Credentials.LOCKDOWN_VPN);
37         // Always notify ConnectivityManager after keystore update
38         context.getSystemService(ConnectivityManager.class).updateLockdownVpn();
39     }
40 
setLockdownVpn(Context context, String lockdownKey)41     public static void setLockdownVpn(Context context, String lockdownKey) {
42         KeyStore.getInstance().put(Credentials.LOCKDOWN_VPN, lockdownKey.getBytes(),
43                 KeyStore.UID_SELF, /* flags */ 0);
44         // Always notify ConnectivityManager after keystore update
45         context.getSystemService(ConnectivityManager.class).updateLockdownVpn();
46     }
47 
isVpnLockdown(String key)48     public static boolean isVpnLockdown(String key) {
49         return key.equals(getLockdownVpn());
50     }
51 }
52