1 /* 2 * Copyright (C) 2019 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.car.notification; 18 19 import android.car.userlib.CarUserManagerHelper; 20 import android.content.Context; 21 import android.content.pm.PackageInfo; 22 import android.content.pm.PackageManager; 23 import android.service.notification.StatusBarNotification; 24 import android.util.Log; 25 26 public class NotificationUtils { 27 private static final String TAG = "NotificationUtils"; 28 NotificationUtils()29 private NotificationUtils() { 30 } 31 32 /** 33 * Validates if the notification posted by the application meets at least one of the below 34 * conditions. 35 * 36 * <ul> 37 * <li>application is signed with platform key. 38 * <li>application is a system and privileged app. 39 * </ul> 40 */ isSystemPrivilegedOrPlatformKey(Context context, StatusBarNotification statusBarNotification)41 public static boolean isSystemPrivilegedOrPlatformKey(Context context, 42 StatusBarNotification statusBarNotification) { 43 return isSystemPrivilegedOrPlatformKeyInner(context, statusBarNotification, 44 /* checkForPrivilegedApp= */ true); 45 } 46 47 /** 48 * Validates if the notification posted by the application meets at least one of the below 49 * conditions. 50 * 51 * <ul> 52 * <li>application is signed with platform key. 53 * <li>application is a system app. 54 * </ul> 55 */ isSystemOrPlatformKey(Context context, StatusBarNotification statusBarNotification)56 public static boolean isSystemOrPlatformKey(Context context, 57 StatusBarNotification statusBarNotification) { 58 return isSystemPrivilegedOrPlatformKeyInner(context, statusBarNotification, 59 /* checkForPrivilegedApp= */ false); 60 } 61 62 /** 63 * Validates if the notification posted by the application is a system application. 64 */ isSystemApp(Context context, StatusBarNotification statusBarNotification)65 public static boolean isSystemApp(Context context, 66 StatusBarNotification statusBarNotification) { 67 PackageManager packageManager = context.getPackageManager(); 68 CarUserManagerHelper carUserManagerHelper = new CarUserManagerHelper(context); 69 PackageInfo packageInfo = null; 70 try { 71 packageInfo = packageManager.getPackageInfoAsUser( 72 statusBarNotification.getPackageName(), /* flags= */ 0, 73 carUserManagerHelper.getCurrentForegroundUserId()); 74 } catch (PackageManager.NameNotFoundException ex) { 75 Log.e(TAG, "package not found: " + statusBarNotification.getPackageName()); 76 } 77 if (packageInfo == null) return false; 78 79 return packageInfo.applicationInfo.isSystemApp(); 80 } 81 82 /** 83 * Validates if the notification posted by the application is signed with platform key. 84 */ isSignedWithPlatformKey(Context context, StatusBarNotification statusBarNotification)85 public static boolean isSignedWithPlatformKey(Context context, 86 StatusBarNotification statusBarNotification) { 87 PackageManager packageManager = context.getPackageManager(); 88 CarUserManagerHelper carUserManagerHelper = new CarUserManagerHelper(context); 89 PackageInfo packageInfo = null; 90 try { 91 packageInfo = packageManager.getPackageInfoAsUser( 92 statusBarNotification.getPackageName(), /* flags= */ 0, 93 carUserManagerHelper.getCurrentForegroundUserId()); 94 } catch (PackageManager.NameNotFoundException ex) { 95 Log.e(TAG, "package not found: " + statusBarNotification.getPackageName()); 96 } 97 if (packageInfo == null) return false; 98 99 return packageInfo.applicationInfo.isSignedWithPlatformKey(); 100 } 101 isSystemPrivilegedOrPlatformKeyInner(Context context, StatusBarNotification statusBarNotification, boolean checkForPrivilegedApp)102 private static boolean isSystemPrivilegedOrPlatformKeyInner(Context context, 103 StatusBarNotification statusBarNotification, boolean checkForPrivilegedApp) { 104 PackageManager packageManager = context.getPackageManager(); 105 CarUserManagerHelper carUserManagerHelper = new CarUserManagerHelper(context); 106 PackageInfo packageInfo = null; 107 try { 108 packageInfo = packageManager.getPackageInfoAsUser( 109 statusBarNotification.getPackageName(), /* flags= */ 0, 110 carUserManagerHelper.getCurrentForegroundUserId()); 111 } catch (PackageManager.NameNotFoundException ex) { 112 Log.e(TAG, "package not found: " + statusBarNotification.getPackageName()); 113 } 114 if (packageInfo == null) return false; 115 116 // Only include the privilegedApp check if the caller wants this check. 117 boolean isPrivilegedApp = 118 (!checkForPrivilegedApp) || packageInfo.applicationInfo.isPrivilegedApp(); 119 120 return (packageInfo.applicationInfo.isSignedWithPlatformKey() || 121 (packageInfo.applicationInfo.isSystemApp() 122 && isPrivilegedApp)); 123 } 124 } 125