| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.packageinstaller.permission.utils; |
| |
| import android.Manifest; |
| import android.content.pm.PackageInfo; |
| import android.content.pm.PackageManager; |
| import android.content.pm.PermissionInfo; |
| import android.text.TextUtils; |
| import android.util.ArrayMap; |
| import android.util.ArraySet; |
| import android.util.EventLog; |
| import android.util.Log; |
| |
| import com.android.packageinstaller.permission.model.AppPermissionGroup; |
| import com.android.packageinstaller.permission.model.Permission; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| public final class SafetyNetLogger { |
| |
| // The log tag used by SafetyNet to pick entries from the event log. |
| private static final int SNET_NET_EVENT_LOG_TAG = 0x534e4554; |
| |
| // Log tag for the result of permissions request. |
| private static final String PERMISSIONS_REQUESTED = "individual_permissions_requested"; |
| |
| // Log tag for the result of permissions toggling. |
| private static final String PERMISSIONS_TOGGLED = "individual_permissions_toggled"; |
| public static final String LOG_TAG = SafetyNetLogger.class.getSimpleName(); |
| |
| private SafetyNetLogger() { |
| /* do nothing */ |
| } |
| |
| public static void logPermissionsRequested(PackageInfo packageInfo, |
| List<AppPermissionGroup> groups) { |
| EventLog.writeEvent(SNET_NET_EVENT_LOG_TAG, PERMISSIONS_REQUESTED, |
| packageInfo.applicationInfo.uid, buildChangedPermissionForPackageMessage( |
| packageInfo.packageName, groups)); |
| } |
| |
| /** |
| * Log that permission groups have been toggled for the purpose of safety net. |
| * |
| * <p>The groups might refer to different permission groups and different apps. |
| * |
| * @param groups The groups toggled |
| */ |
| public static void logPermissionsToggled(ArraySet<AppPermissionGroup> groups) { |
| ArrayMap<String, ArrayList<AppPermissionGroup>> groupsByPackage = new ArrayMap<>(); |
| |
| int numGroups = groups.size(); |
| for (int i = 0; i < numGroups; i++) { |
| AppPermissionGroup group = groups.valueAt(i); |
| |
| ArrayList<AppPermissionGroup> groupsForThisPackage = groupsByPackage.get( |
| group.getApp().packageName); |
| if (groupsForThisPackage == null) { |
| groupsForThisPackage = new ArrayList<>(); |
| groupsByPackage.put(group.getApp().packageName, groupsForThisPackage); |
| } |
| |
| groupsForThisPackage.add(group); |
| if (group.getBackgroundPermissions() != null) { |
| groupsForThisPackage.add(group.getBackgroundPermissions()); |
| } |
| } |
| |
| int numPackages = groupsByPackage.size(); |
| for (int i = 0; i < numPackages; i++) { |
| EventLog.writeEvent(SNET_NET_EVENT_LOG_TAG, PERMISSIONS_TOGGLED, |
| android.os.Process.myUid(), buildChangedPermissionForPackageMessage( |
| groupsByPackage.keyAt(i), groupsByPackage.valueAt(i))); |
| } |
| } |
| |
| /** |
| * Log that a permission group has been toggled for the purpose of safety net. |
| * |
| * @param group The group toggled. |
| */ |
| public static void logPermissionToggled(AppPermissionGroup group) { |
| ArraySet groups = new ArraySet<AppPermissionGroup>(1); |
| groups.add(group); |
| logPermissionsToggled(groups); |
| } |
| |
| private static void buildChangedPermissionForGroup(AppPermissionGroup group, |
| StringBuilder builder) { |
| int permissionCount = group.getPermissions().size(); |
| for (int permissionNum = 0; permissionNum < permissionCount; permissionNum++) { |
| Permission permission = group.getPermissions().get(permissionNum); |
| |
| if (builder.length() > 0) { |
| builder.append(';'); |
| } |
| |
| builder.append(permission.getName()).append('|'); |
| builder.append(permission.isGrantedIncludingAppOp()).append('|'); |
| builder.append(permission.getFlags()); |
| } |
| } |
| |
| private static String buildChangedPermissionForPackageMessage(String packageName, |
| List<AppPermissionGroup> groups) { |
| StringBuilder builder = new StringBuilder(); |
| |
| builder.append(packageName).append(':'); |
| |
| int groupCount = groups.size(); |
| for (int groupNum = 0; groupNum < groupCount; groupNum++) { |
| AppPermissionGroup group = groups.get(groupNum); |
| |
| buildChangedPermissionForGroup(group, builder); |
| if (group.getBackgroundPermissions() != null) { |
| buildChangedPermissionForGroup(group.getBackgroundPermissions(), builder); |
| } |
| } |
| |
| return builder.toString(); |
| } |
| |
| /** |
| * Log if the given package has defined a permission in the undefined group. |
| * |
| * @param pm A PackageManager to look up the package. |
| * @param packageName The name of the package to check. |
| */ |
| public static void logIfHasUndefinedPermissionGroup(PackageManager pm, String packageName) { |
| try { //Avoid crashing for any reason |
| PermissionInfo[] permissions = |
| pm.getPackageInfo(packageName, PackageManager.GET_PERMISSIONS).permissions; |
| if (permissions == null) { |
| return; |
| } |
| for (PermissionInfo permission : permissions) { |
| if (TextUtils.equals(permission.group, Manifest.permission_group.UNDEFINED)) { |
| EventLog.writeEvent(SNET_NET_EVENT_LOG_TAG, "153879813"); |
| } |
| } |
| } catch (Throwable e) { |
| Log.e(LOG_TAG, "Unable to log undefined permission event for " + packageName + ".", e); |
| } |
| } |
| } |