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 17 package com.android.server.os; 18 19 import android.Manifest; 20 import android.annotation.NonNull; 21 import android.annotation.Nullable; 22 import android.content.Context; 23 import android.content.pm.PackageManager; 24 import android.os.Binder; 25 import android.os.Build; 26 import android.os.IDeviceIdentifiersPolicyService; 27 import android.os.Process; 28 import android.os.RemoteException; 29 import android.os.SystemProperties; 30 import android.os.UserHandle; 31 import com.android.server.SystemService; 32 33 /** 34 * This service defines the policy for accessing device identifiers. 35 */ 36 public final class DeviceIdentifiersPolicyService extends SystemService { 37 public DeviceIdentifiersPolicyService(Context context) { 38 super(context); 39 } 40 41 @Override 42 public void onStart() { 43 publishBinderService(Context.DEVICE_IDENTIFIERS_SERVICE, 44 new DeviceIdentifiersPolicy(getContext())); 45 } 46 47 private static final class DeviceIdentifiersPolicy 48 extends IDeviceIdentifiersPolicyService.Stub { 49 private final @NonNull Context mContext; 50 51 public DeviceIdentifiersPolicy(Context context) { 52 mContext = context; 53 } 54 55 @Override 56 public @Nullable String getSerial() throws RemoteException { 57 if (UserHandle.getAppId(Binder.getCallingUid()) != Process.SYSTEM_UID 58 && mContext.checkCallingOrSelfPermission( 59 Manifest.permission.READ_PHONE_STATE) 60 != PackageManager.PERMISSION_GRANTED 61 && mContext.checkCallingOrSelfPermission( 62 Manifest.permission.READ_PRIVILEGED_PHONE_STATE) 63 != PackageManager.PERMISSION_GRANTED) { 64 throw new SecurityException("getSerial requires READ_PHONE_STATE" 65 + " or READ_PRIVILEGED_PHONE_STATE permission"); 66 } 67 return SystemProperties.get("ro.serialno", Build.UNKNOWN); 68 } 69 } 70 } 71
