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; 18 19 import android.app.admin.DevicePolicyManager; 20 import android.content.Context; 21 import android.content.pm.PackageManager; 22 import android.os.Binder; 23 import android.os.CpuUsageInfo; 24 import android.os.IHardwarePropertiesManager; 25 import android.os.Process; 26 import android.os.UserHandle; 27 import com.android.server.vr.VrManagerInternal; 28 29 import java.util.Arrays; 30 31 /** 32 * Service for {@link HardwarePropertiesManager} 33 */ 34 public class HardwarePropertiesManagerService extends IHardwarePropertiesManager.Stub { 35 nativeInit()36 private static native void nativeInit(); 37 nativeGetFanSpeeds()38 private static native float[] nativeGetFanSpeeds(); nativeGetDeviceTemperatures(int type, int source)39 private static native float[] nativeGetDeviceTemperatures(int type, int source); nativeGetCpuUsages()40 private static native CpuUsageInfo[] nativeGetCpuUsages(); 41 42 private final Context mContext; 43 private final Object mLock = new Object(); 44 HardwarePropertiesManagerService(Context context)45 public HardwarePropertiesManagerService(Context context) { 46 mContext = context; 47 synchronized (mLock) { 48 nativeInit(); 49 } 50 } 51 52 @Override getDeviceTemperatures(String callingPackage, int type, int source)53 public float[] getDeviceTemperatures(String callingPackage, int type, int source) 54 throws SecurityException { 55 enforceHardwarePropertiesRetrievalAllowed(callingPackage); 56 synchronized (mLock) { 57 return nativeGetDeviceTemperatures(type, source); 58 } 59 } 60 61 @Override getCpuUsages(String callingPackage)62 public CpuUsageInfo[] getCpuUsages(String callingPackage) throws SecurityException { 63 enforceHardwarePropertiesRetrievalAllowed(callingPackage); 64 synchronized (mLock) { 65 return nativeGetCpuUsages(); 66 } 67 } 68 69 @Override getFanSpeeds(String callingPackage)70 public float[] getFanSpeeds(String callingPackage) throws SecurityException { 71 enforceHardwarePropertiesRetrievalAllowed(callingPackage); 72 synchronized (mLock) { 73 return nativeGetFanSpeeds(); 74 } 75 } 76 77 /** 78 * Throws SecurityException if the calling package is not allowed to retrieve information 79 * provided by the service. 80 * 81 * @param callingPackage The calling package name. 82 * 83 * @throws SecurityException if something other than the profile or device owner, or the 84 * current VR service tries to retrieve information provided by this service. 85 */ enforceHardwarePropertiesRetrievalAllowed(String callingPackage)86 private void enforceHardwarePropertiesRetrievalAllowed(String callingPackage) 87 throws SecurityException { 88 final PackageManager pm = mContext.getPackageManager(); 89 int uid = 0; 90 try { 91 uid = pm.getPackageUid(callingPackage, 0); 92 if (Binder.getCallingUid() != uid) { 93 throw new SecurityException("The caller has faked the package name."); 94 } 95 } catch (PackageManager.NameNotFoundException e) { 96 throw new SecurityException("The caller has faked the package name."); 97 } 98 99 final int userId = UserHandle.getUserId(uid); 100 final VrManagerInternal vrService = LocalServices.getService(VrManagerInternal.class); 101 final DevicePolicyManager dpm = mContext.getSystemService(DevicePolicyManager.class); 102 if (!dpm.isDeviceOwnerApp(callingPackage) && !dpm.isProfileOwnerApp(callingPackage) 103 && !vrService.isCurrentVrListener(callingPackage, userId)) { 104 throw new SecurityException("The caller is not a device or profile owner or bound " 105 + "VrListenerService."); 106 } 107 } 108 } 109