1 /*
2  * Copyright (C) 2015 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 
17 package android.security;
18 
19 import android.content.Context;
20 import android.os.RemoteException;
21 import android.os.ServiceManager;
22 import android.os.UserHandle;
23 import android.service.gatekeeper.IGateKeeperService;
24 
25 /**
26  * Convenience class for accessing the gatekeeper service.
27  *
28  * @hide
29  */
30 public abstract class GateKeeper {
31 
32     public static final long INVALID_SECURE_USER_ID = 0;
33 
GateKeeper()34     private GateKeeper() {}
35 
getService()36     public static IGateKeeperService getService() {
37         IGateKeeperService service = IGateKeeperService.Stub.asInterface(
38                 ServiceManager.getService(Context.GATEKEEPER_SERVICE));
39         if (service == null) {
40             throw new IllegalStateException("Gatekeeper service not available");
41         }
42         return service;
43     }
44 
getSecureUserId()45     public static long getSecureUserId() throws IllegalStateException {
46         try {
47             return getService().getSecureUserId(UserHandle.myUserId());
48         } catch (RemoteException e) {
49             throw new IllegalStateException(
50                     "Failed to obtain secure user ID from gatekeeper", e);
51         }
52     }
53 }
54