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/*
* Copyright (C) 2023 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.permissioncontroller.safetylabel
import android.Manifest
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.Intent.ACTION_PACKAGE_ADDED
import android.content.pm.PackageManager
import android.os.Build
import android.os.Process
import android.os.UserHandle
import android.os.UserManager
import android.util.Log
import androidx.annotation.MainThread
import androidx.annotation.RequiresApi
import com.android.permission.safetylabel.SafetyLabel as AppMetadataSafetyLabel
import com.android.permissioncontroller.permission.data.v34.LightInstallSourceInfoLiveData
import com.android.permissioncontroller.permission.data.LightPackageInfoLiveData
import com.android.permissioncontroller.permission.model.livedatatypes.LightPackageInfo
import com.android.permissioncontroller.permission.utils.KotlinUtils
import com.android.permissioncontroller.permission.utils.PermissionMapping
import com.android.permissioncontroller.permission.utils.Utils
import com.android.permissioncontroller.safetylabel.AppsSafetyLabelHistory.SafetyLabel as SafetyLabelForPersistence
import java.time.Instant
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
/**
* Listens for package installs and updates, and updates the [AppsSafetyLabelHistoryPersistence] if
* the app safety label has changed.
*/
// TODO(b/264884476): Remove excess logging from this class once feature is stable.
@RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
class SafetyLabelChangedBroadcastReceiver : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
if (!KotlinUtils.isSafetyLabelChangeNotificationsEnabled(context)) {
return
}
val packageChangeEvent = getPackageChangeEvent(intent)
if (!(packageChangeEvent == PackageChangeEvent.NEW_INSTALL ||
packageChangeEvent == PackageChangeEvent.UPDATE)) {
return
}
val packageName = intent.data?.schemeSpecificPart
if (packageName == null) {
Log.w(TAG, "Received broadcast without package name")
return
}
val currentUser = Process.myUserHandle()
if (DEBUG) {
Log.i(
TAG,
"received broadcast packageName: $packageName, current user: $currentUser," +
" packageChangeEvent: $packageChangeEvent, intent user:" +
" ${intent.getParcelableExtra(Intent.EXTRA_USER, UserHandle::class.java)
?: currentUser}")
}
val userManager = Utils.getSystemServiceSafe(context, UserManager::class.java)
if (userManager.isProfile) {
forwardBroadcastToParentUser(context, userManager, intent)
return
}
val user: UserHandle =
intent.getParcelableExtra(Intent.EXTRA_USER, UserHandle::class.java) ?: currentUser
val pendingResult: PendingResult = goAsync()
GlobalScope.launch(Dispatchers.Main) {
processPackageChange(context, packageName, user)
pendingResult.finish()
}
}
/** Processes the package change for the given package and user. */
private suspend fun processPackageChange(
context: Context,
packageName: String,
user: UserHandle,
) {
val lightPackageInfo =
LightPackageInfoLiveData[Pair(packageName, user)].getInitializedValue() ?: return
if (!isAppRequestingLocationPermission(lightPackageInfo)) {
return
}
// TODO(b/261607291): Enable safety label change notifications feature for
// preinstalled apps.
if (!isStoreInstalledPackage(Pair(packageName, user))) {
return
}
writeSafetyLabel(context, lightPackageInfo, user)
}
/**
* Retrieves and writes the safety label for a package to the safety labels store.
*
* As I/O operations are invoked, we run this method on the main thread.
*/
@MainThread
private fun writeSafetyLabel(
context: Context,
lightPackageInfo: LightPackageInfo,
user: UserHandle,
) {
val packageName = lightPackageInfo.packageName
if (DEBUG) {
Log.i(
TAG,
"writeSafetyLabel called for packageName: $packageName, currentUser:" +
" ${Process.myUserHandle()}")
}
// Get the context for the user in which the app is installed.
val userContext =
if (user == Process.myUserHandle()) {
context
} else {
context.createContextAsUser(user, 0)
}
val appMetadataBundle =
try {
userContext.packageManager.getAppMetadata(packageName)
} catch (e: PackageManager.NameNotFoundException) {
Log.w(TAG, "Package $packageName not found while retrieving app metadata")
return
}
if (DEBUG) {
Log.i(TAG, "appMetadataBundle $appMetadataBundle")
}
val safetyLabel: AppMetadataSafetyLabel =
AppMetadataSafetyLabel.getSafetyLabelFromMetadata(appMetadataBundle) ?: return
val receivedAtMs: Long = lightPackageInfo.lastUpdateTime
val safetyLabelForPersistence: SafetyLabelForPersistence =
AppsSafetyLabelHistory.SafetyLabel.extractLocationSharingSafetyLabel(
packageName, Instant.ofEpochMilli(receivedAtMs), safetyLabel)
val historyFile = AppsSafetyLabelHistoryPersistence.getSafetyLabelHistoryFile(context)
AppsSafetyLabelHistoryPersistence.recordSafetyLabel(safetyLabelForPersistence, historyFile)
}
private fun getPackageChangeEvent(intent: Intent): PackageChangeEvent {
val action = intent.action
val replacing = intent.getBooleanExtra(Intent.EXTRA_REPLACING, false)
return if (isPackageAddedBroadcast(action) && replacing) {
PackageChangeEvent.UPDATE
} else if (isPackageAddedBroadcast(action)) {
PackageChangeEvent.NEW_INSTALL
} else {
PackageChangeEvent.INSIGNIFICANT
}
}
/** Companion object for [SafetyLabelChangedBroadcastReceiver]. */
companion object {
private val TAG = SafetyLabelChangedBroadcastReceiver::class.simpleName
private const val ACTION_PACKAGE_ADDED_PERMISSIONCONTROLLER_FORWARDED =
"com.android.permissioncontroller.action.PACKAGE_ADDED_PERMISSIONCONTROLLER_FORWARDED"
private const val DEBUG = true
private val LOCATION_PERMISSIONS =
PermissionMapping.getPlatformPermissionNamesOfGroup(Manifest.permission_group.LOCATION)
private fun isAppRequestingLocationPermission(lightPackageInfo: LightPackageInfo): Boolean {
return lightPackageInfo.requestedPermissions.any { LOCATION_PERMISSIONS.contains(it) }
}
private suspend fun isStoreInstalledPackage(
packageUser: Pair<String, UserHandle>
): Boolean {
val lightInstallSourceInfo =
LightInstallSourceInfoLiveData[packageUser].getInitializedValue()
return lightInstallSourceInfo.isStoreInstalled()
}
private fun isPackageAddedBroadcast(intentAction: String?) =
intentAction == ACTION_PACKAGE_ADDED ||
intentAction == ACTION_PACKAGE_ADDED_PERMISSIONCONTROLLER_FORWARDED
private fun forwardBroadcastToParentUser(
context: Context,
userManager: UserManager,
intent: Intent
) {
val currentUser = Process.myUserHandle()
val profileParent = userManager.getProfileParent(currentUser)
if (profileParent == null) {
Log.w(TAG, "Could not find profile parent for $currentUser")
return
}
Log.i(
TAG,
"Forwarding intent from current user: $currentUser to profile parent" +
" $profileParent")
context.sendBroadcastAsUser(
Intent(intent)
.setAction(ACTION_PACKAGE_ADDED_PERMISSIONCONTROLLER_FORWARDED)
.putExtra(Intent.EXTRA_USER, currentUser),
profileParent)
}
/** Types of package change events. */
enum class PackageChangeEvent {
INSIGNIFICANT,
NEW_INSTALL,
UPDATE,
}
}
}
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