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/*
* Copyright (C) 2019 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.service;
import android.Manifest;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.permission.PermissionManager;
import android.text.TextUtils;
import android.util.Log;
import androidx.annotation.NonNull;
import com.android.packageinstaller.permission.model.AppPermissionGroup;
import com.android.packageinstaller.permission.utils.Utils;
import java.util.List;
/**
* This class handles upgrading the runtime permissions database
*/
class RuntimePermissionsUpgradeController {
private static final String LOG_TAG = RuntimePermissionsUpgradeController.class.getSimpleName();
// The latest version of the runtime permissions database
private static final int LATEST_VERSION = 7;
private RuntimePermissionsUpgradeController() {
/* do nothing - hide constructor */
}
static void upgradeIfNeeded(@NonNull Context context) {
final PermissionManager permissionManager = context.getSystemService(
PermissionManager.class);
final int currentVersion = permissionManager.getRuntimePermissionsVersion();
final int upgradedVersion = onUpgradeLocked(context, currentVersion);
if (upgradedVersion != LATEST_VERSION) {
Log.wtf("PermissionControllerService", "warning: upgrading permission database"
+ " to version " + LATEST_VERSION + " left it at " + currentVersion
+ " instead; this is probably a bug. Did you update LATEST_VERSION?",
new Throwable());
throw new RuntimeException("db upgrade error");
}
if (currentVersion != upgradedVersion) {
permissionManager.setRuntimePermissionsVersion(LATEST_VERSION);
}
}
/**
* You must perform all necessary mutations to bring the runtime permissions
* database from the old to the new version. When you add a new upgrade step
* you *must* update LATEST_VERSION.
*
* @param context Context to access APIs.
* @param currentVersion The current db version.
*/
private static int onUpgradeLocked(@NonNull Context context, int currentVersion) {
final List<PackageInfo> apps = context.getPackageManager()
.getInstalledPackages(PackageManager.MATCH_ALL
| PackageManager.GET_PERMISSIONS);
final int appCount = apps.size();
final boolean sdkUpgradedFromP;
if (currentVersion <= -1) {
Log.i(LOG_TAG, "Upgrading from Android P");
sdkUpgradedFromP = true;
currentVersion = 0;
} else {
sdkUpgradedFromP = false;
}
if (currentVersion == 0) {
Log.i(LOG_TAG, "Grandfathering SMS and CallLog permissions");
final List<String> smsPermissions = Utils.getPlatformPermissionNamesOfGroup(
android.Manifest.permission_group.SMS);
final List<String> callLogPermissions = Utils.getPlatformPermissionNamesOfGroup(
Manifest.permission_group.CALL_LOG);
for (int i = 0; i < appCount; i++) {
final PackageInfo app = apps.get(i);
if (app.requestedPermissions == null) {
continue;
}
for (String requestedPermission : app.requestedPermissions) {
if (smsPermissions.contains(requestedPermission)
|| callLogPermissions.contains(requestedPermission)) {
context.getPackageManager().addWhitelistedRestrictedPermission(
app.packageName, requestedPermission,
PackageManager.FLAG_PERMISSION_WHITELIST_UPGRADE);
}
}
}
currentVersion = 1;
}
if (currentVersion == 1) {
// moved to step 4->5 as it has to be after the grandfathering of loc bg perms
currentVersion = 2;
}
if (currentVersion == 2) {
// moved to step 5->6 to clean up broken permission state during dogfooding
currentVersion = 3;
}
if (currentVersion == 3) {
Log.i(LOG_TAG, "Grandfathering location background permissions");
for (int i = 0; i < appCount; i++) {
final PackageInfo app = apps.get(i);
if (app.requestedPermissions == null) {
continue;
}
for (String requestedPermission : app.requestedPermissions) {
if (requestedPermission.equals(
Manifest.permission.ACCESS_BACKGROUND_LOCATION)) {
context.getPackageManager().addWhitelistedRestrictedPermission(
app.packageName, Manifest.permission.ACCESS_BACKGROUND_LOCATION,
PackageManager.FLAG_PERMISSION_WHITELIST_UPGRADE);
break;
}
}
}
currentVersion = 4;
}
if (currentVersion == 4) {
// moved to step 5->6 to clean up broken permission state during beta 4->5 upgrade
currentVersion = 5;
}
if (currentVersion == 5) {
Log.i(LOG_TAG, "Grandfathering Storage permissions");
final List<String> storagePermissions = Utils.getPlatformPermissionNamesOfGroup(
Manifest.permission_group.STORAGE);
for (int i = 0; i < appCount; i++) {
final PackageInfo app = apps.get(i);
if (app.requestedPermissions == null) {
continue;
}
// We don't want to allow modification of storage post install, so put it
// on the internal system whitelist to prevent the installer changing it.
for (String requestedPermission : app.requestedPermissions) {
if (storagePermissions.contains(requestedPermission)) {
context.getPackageManager().addWhitelistedRestrictedPermission(
app.packageName, requestedPermission,
PackageManager.FLAG_PERMISSION_WHITELIST_UPGRADE);
}
}
}
currentVersion = 6;
}
if (currentVersion == 6) {
if (sdkUpgradedFromP) {
Log.i(LOG_TAG, "Expanding location permissions");
for (int i = 0; i < appCount; i++) {
final PackageInfo app = apps.get(i);
if (app.requestedPermissions == null) {
continue;
}
for (String perm : app.requestedPermissions) {
String groupName = Utils.getGroupOfPlatformPermission(perm);
if (!TextUtils.equals(groupName, Manifest.permission_group.LOCATION)) {
continue;
}
final AppPermissionGroup group = AppPermissionGroup.create(context, app,
perm, false);
final AppPermissionGroup bgGroup = group.getBackgroundPermissions();
if (group.areRuntimePermissionsGranted()
&& bgGroup != null
&& !bgGroup.isUserSet() && !bgGroup.isSystemFixed()
&& !bgGroup.isPolicyFixed()) {
bgGroup.grantRuntimePermissions(group.isUserFixed());
}
break;
}
}
} else {
Log.i(LOG_TAG, "Not expanding location permissions as this is not an upgrade "
+ "from Android P");
}
currentVersion = 7;
}
// XXX: Add new upgrade steps above this point.
return currentVersion;
}
}
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