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 com.android.packageinstaller.permission.utils; 18 19 import android.content.pm.PackageInfo; 20 import android.util.EventLog; 21 22 import com.android.packageinstaller.permission.model.AppPermissionGroup; 23 import com.android.packageinstaller.permission.model.Permission; 24 25 import java.util.List; 26 27 public final class SafetyNetLogger { 28 29 // The log tag used by SafetyNet to pick entries from the event log. 30 private static final int SNET_NET_EVENT_LOG_TAG = 0x534e4554; 31 32 // Log tag for the result of permissions request. 33 private static final String PERMISSIONS_REQUESTED = "individual_permissions_requested"; 34 35 // Log tag for the result of permissions toggling. 36 private static final String PERMISSIONS_TOGGLED = "individual_permissions_toggled"; 37 SafetyNetLogger()38 private SafetyNetLogger() { 39 /* do nothing */ 40 } 41 logPermissionsRequested(PackageInfo packageInfo, List<AppPermissionGroup> groups)42 public static void logPermissionsRequested(PackageInfo packageInfo, 43 List<AppPermissionGroup> groups) { 44 EventLog.writeEvent(SNET_NET_EVENT_LOG_TAG, PERMISSIONS_REQUESTED, 45 packageInfo.applicationInfo.uid, buildChangedPermissionForPackageMessage( 46 packageInfo.packageName, groups)); 47 } 48 logPermissionsToggled(String packageName, List<AppPermissionGroup> groups)49 public static void logPermissionsToggled(String packageName, List<AppPermissionGroup> groups) { 50 EventLog.writeEvent(SNET_NET_EVENT_LOG_TAG, PERMISSIONS_TOGGLED, 51 android.os.Process.myUid(), buildChangedPermissionForPackageMessage( 52 packageName, groups)); 53 } 54 buildChangedPermissionForPackageMessage(String packageName, List<AppPermissionGroup> groups)55 private static String buildChangedPermissionForPackageMessage(String packageName, 56 List<AppPermissionGroup> groups) { 57 StringBuilder builder = new StringBuilder(); 58 59 builder.append(packageName).append(':'); 60 61 int groupCount = groups.size(); 62 for (int groupNum = 0; groupNum < groupCount; groupNum++) { 63 AppPermissionGroup group = groups.get(groupNum); 64 65 int permissionCount = group.getPermissions().size(); 66 for (int permissionNum = 0; permissionNum < permissionCount; permissionNum++) { 67 Permission permission = group.getPermissions().get(permissionNum); 68 69 if (groupNum > 0 || permissionNum > 0) { 70 builder.append(';'); 71 } 72 73 builder.append(permission.getName()).append('|'); 74 75 if (group.doesSupportRuntimePermissions()) { 76 builder.append(permission.isGranted()).append('|'); 77 } else { 78 builder.append(permission.isGranted() && (permission.getAppOp() == null 79 || permission.isAppOpAllowed())).append('|'); 80 } 81 82 builder.append(permission.getFlags()); 83 } 84 } 85 86 return builder.toString(); 87 } 88 } 89