This guide walks you through the integration of Appdome’s Threat-Events™ into your Flutter applications using Swift and Kotlin
Appdome Threat-Events is a robust threat-intelligence framework designed for Android and iOS apps. It consists of three key elements:
Threat-Events streamlines the process for mobile developers by enabling them to register for, listen to, and consume real-time attack and threat data, courtesy of Appdome’s suite of mobile app security, anti-fraud, and mobile anti-bot protection measures. This functionality offers mobile app developers the ability to customize business logic and user experience based on the user’s risk profile and the specific attack or threat presented but also ensures that their mobile application workflows are aware of attacks and threats. Furthermore, it facilitates the passing of threat data to other systems of record, such as app servers, mobile fraud analysis systems, SIEMs, and other data collection points.
The purpose of Threat Events is to enable Android and iOS applications to adapt and respond to mobile app attacks and threats in real-time. This will ensure the safety of users, data, and transactions.
For more details on Threat Events, see Threat-Events in Android & iOS Apps Explained
Before implementing Threat-Events or Threat-Scores in your Flutter App, ensure that the following conditions are met:
Note: The specific identifiers for each Threat Event and Threat Score are in the knowledge base article associated with each protection.
The figure below shows where you can find Threat Events and Threat Scores for each of the runtime mobile app security, anti-fraud, anti-malware, mobile antibot, and other protections available on Appdome.
To enable Threat-Events with any runtime protection, select the check box next to Threat-Events for that feature. Doing so will enable (turn ON) Threat-Events for that feature. To enable Threat Scores for any runtime protection, click the up/down arrow associated with Threat Scores to assign a specific score to each protection.
Threat scores must have a value greater than zero (0) and less than a thousand (1,000).
Threat-Events and Threat-Scores can be used with or in place of server-based mobile anti-fraud solutions.
Flutter provides various approaches to bridge the gap between its Dart code and platform-specific functionality on Android and iOS. Some common options include:
Choose the approach that best suits your needs when bridging the gap between Flutter and native platforms Threat-Events.
Event channels are the optimal approach for integrating threat events into your Flutter app due to their inherent security-centric advantages:
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
class PlatformChannel extends StatefulWidget {
const PlatformChannel({super.key});
@override
State createState() => _PlatformChannelState();
}
class _PlatformChannelState extends State {
static const String _eventChannelName = 'yourEventChannel'; // Replace with your EventChannel name
static const EventChannel _eventChannel = EventChannel(_eventChannelName);
String _currentThreatEvent = 'No ThreatEvent detected';
String? keyboardID;
String? keyboardBlocked;
String? defaultMessage;
String? timeStamp;
String? deviceID;
String? deviceModel;
String? osVersion;
String? kernelInfo;
String? deviceManufacturer;
String? fusedAppToken;
String? carrierPlmn;
String? deviceBrand;
String? deviceBoard;
String? buildHost;
String? buildUser;
String? sdkVersion;
@override
void initState() {
super.initState();
_eventChannel.receiveBroadcastStream().listen(_onEvent, onError: _onError);
}
void _onEvent(Object? event) {
setState(() {
// Adapt this section based on your specific event data structure
var eventData = event as Map;
// Example: Accessing 'externalID' field from the event
var externalID = eventData['externalID'];
// Customize the rest of the fields based on your event structure
keyboardID = eventData['keyboard'];
keyboardBlocked = eventData['blocked'];
defaultMessage = eventData['defaultMessage'];
timeStamp = eventData['timestamp'];
deviceID = eventData['deviceID'];
deviceModel = eventData['deviceModel'];
osVersion = eventData['osVersion'];
kernelInfo = eventData['kernelInfo'];
deviceManufacturer = eventData['deviceManufacturer'];
fusedAppToken = eventData['fusedAppToken'];
carrierPlmn = eventData['carrierPlmn'];
deviceBrand = eventData['deviceBrand'];
deviceBoard = eventData['deviceBoard'];
buildHost = eventData['buildHost'];
buildUser = eventData['buildUser'];
sdkVersion = eventData['sdkVersion'];
_currentThreatEvent = "Detected ThreatEvent: $externalID.\n"
"Keyboard ID: $keyboardID\n"
"Keyboard Blocked: $keyboardBlocked\n"
"Default Message: $defaultMessage\n"
"Timestamp: $timeStamp\n"
"Device ID: $deviceID\n"
"Device Model: $deviceModel\n"
"OS Version: $osVersion\n"
"Kernel Info: $kernelInfo\n"
"Device Manufacturer: $deviceManufacturer\n"
"Fused App Token: $fusedAppToken\n"
"Carrier PLMN: $carrierPlmn\n"
"Device Brand: $deviceBrand\n"
"Device Board: $deviceBoard\n"
"Build Host: $buildHost\n"
"Build User: $buildUser\n"
"SDK Version: $sdkVersion\n";
});
}
void _onError(Object error) {
setState(() {
_currentThreatEvent = 'Failed To Get ThreatEvent: ${error}.';
});
}
@override
Widget build(BuildContext context) {
return Material(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Text(_currentThreatEvent),
],
),
);
}
}
void main() {
runApp(const MaterialApp(home: PlatformChannel()));
}
import Flutter
import UIKit
@main
@objc class AppDelegate: FlutterAppDelegate, FlutterStreamHandler {
var eventSink: FlutterEventSink?
var threatEventReceiver: ThreatEventReceiver?
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
GeneratedPluginRegistrant.register(with: self)
let controller: FlutterViewController = window?.rootViewController as! FlutterViewController
let threatEventBridge = FlutterEventChannel(name: "yourEventChannel", binaryMessenger: controller.binaryMessenger)
threatEventBridge.setStreamHandler(self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
func onListen(
withArguments arguments: Any?,
eventSink: @escaping FlutterEventSink
) -> FlutterError? {
threatEventReceiver = ThreatEventReceiver()
threatEventReceiver?.eventSink = eventSink
return nil
}
func onCancel(withArguments arguments: Any?) -> FlutterError? {
return nil
}
}
import Foundation
import Flutter
class ThreatEventReceiver: NSObject {
var eventSink: FlutterEventSink?
override init() {
super.init()
// List of constant names
let notificationNames: [Notification.Name] = [
Notification.Name("BlockedKeyboardEvent"),
Notification.Name("BlockedClipboardEvent"),
Notification.Name("JailbrokenDevice"),
Notification.Name("SslCertificateValidationFailed"),
Notification.Name("SslNonSslConnection"),
Notification.Name("SslServerCertificatePinningFailed"),
Notification.Name("UrlWhitelistFailed"),
Notification.Name("BlockedScreenCaptureEvent"),
Notification.Name("SslIncompatibleCipher"),
Notification.Name("SslIncompatibleVersion"),
Notification.Name("SslInvalidCertificateChain"),
Notification.Name("SslInvalidMinRSASignature"),
Notification.Name("SslInvalidMinECCSignature"),
Notification.Name("SslInvalidMinDigest"),
Notification.Name("AppIntegrityError")
]
// Add observers for each constant name
for notificationName in notificationNames {
NotificationCenter.default.addObserver(
self,
selector: #selector(handleNotification(_:)),
name: notificationName,
object: nil
)
}
}
deinit {
// Remove all observers when the object is deallocated
NotificationCenter.default.removeObserver(self)
eventSink = nil
}
@objc func handleNotification(_ notification: Notification) {
// Handle the notification here
print("Received notification: \(notification.name)")
guard let eventSink = eventSink else {
return
}
if let userInfo = notification.userInfo {
eventSink(userInfo)
} else {
eventSink(FlutterError(code: "UNAVAILABLE", message: "ThreatEvent action is null", details: nil))
}
}
}
package com.example.threat_intelligence_swift_kotlin
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.EventChannel
import io.flutter.plugin.common.EventChannel.EventSink
class MainActivity : FlutterActivity() {
private val YOUR_EVENT_CHANNEL = "yourEventChannel" // Replace with your EventChannel name
override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
super.configureFlutterEngine(flutterEngine)
EventChannel(flutterEngine.dartExecutor.binaryMessenger, YOUR_EVENT_CHANNEL).setStreamHandler(
object : EventChannel.StreamHandler {
private var threatEventReceiver: ThreatEventReceiver? = null
override fun onListen(arguments: Any?, events: EventSink?) {
threatEventReceiver = ThreatEventReceiver()
threatEventReceiver!!.init(this@MainActivity, events)
}
override fun onCancel(arguments: Any?) {
threatEventReceiver!!.stop()
threatEventReceiver = null
}
}
)
}
}
package com.example.threat_intelligence_swift_kotlin
import android.content.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import android.os.Build
import io.flutter.plugin.common.EventChannel.EventSink
class ThreatEventReceiver {
private var receiver: BroadcastReceiver? = null
private var context: Context? = null
private val TAG = "ThreatEventReceiver"
private val BLOCKED_KEYBOARD = "BlockedKeyboardEvent" // Replace with your event names
private val BLOCKED_CLIPBOARD = "BlockedClipboardEvent"
private val ROOTED_DEVICE = "RootedDevice"
private val UNKNOWN_SOURCES = "UnknownSourcesEnabled"
private val DEVELOPER_OPTIONS = "DeveloperOptionsEnabled"
private val SSL_VALIDATION_FAILED = "SslCertificateValidationFailed"
private val SSL_NON_SSL_CONNECTION = "SslNonSslConnection"
private val SSL_CERT_PINNING_FAILED = "SslCertificatePinningFailed"
private val ACCESS_OUTSIDE_WHITELIST = "UrlWhitelistFailed"
private val SSL_INCOMPATIBLE_CIPHER = "SslIncompatibleCipher"
private val SSL_INCOMPATIBLE_TLS = "SslIncompatibleVersion"
private val SSL_INVALID_CA_CHAIN = "SslInvalidCertificateChain"
private val SSL_INVALID_RSA_SIGNATURE = "SslInvalidMinRSASignature"
private val SSL_INVALID_ECC_SIGNATURE = "SslInvalidMinECCSignature"
private val SSL_INVALID_DIGEST = "SslInvalidMinDigest"
private val BLOCKED_MANUFACTURER = "BannedManufacturer"
// Only available when ONEShield Threat Events are enabled
private val TAMPERED_APP = "AppIntegrityError"
private val EMULATOR_FOUND = "EmulatorFound"
// Explicitly state that the ThreatEvents BroadcastReceiver should not be exported
private fun registerReceiverWithFlags(intentFilter: IntentFilter) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
context!!.registerReceiver(receiver, intentFilter, Context.RECEIVER_NOT_EXPORTED)
} else {
context!!.registerReceiver(receiver, intentFilter)
}
}
fun init(context: Context?, events: EventSink?) {
this.context = context
receiver = object : BroadcastReceiver() {
override fun onReceive(context: Context, intent: Intent) {
if (intent.action != null) {
val map: MutableMap<String, Any?> = HashMap()
val extras = intent.extras
if (extras != null) {
for (key in extras.keySet()) {
val value = extras[key]
map[key] = value
}
events?.success(map)
}
} else {
events?.error("UNAVAILABLE", "ThreatEvent action is null", null)
}
}
}
registerReceiverWithFlags(IntentFilter(BLOCKED_KEYBOARD))
registerReceiverWithFlags(IntentFilter(BLOCKED_CLIPBOARD))
registerReceiverWithFlags(IntentFilter(ROOTED_DEVICE))
registerReceiverWithFlags(IntentFilter(UNKNOWN_SOURCES))
registerReceiverWithFlags(IntentFilter(DEVELOPER_OPTIONS))
registerReceiverWithFlags(IntentFilter(SSL_VALIDATION_FAILED))
registerReceiverWithFlags(IntentFilter(SSL_NON_SSL_CONNECTION))
registerReceiverWithFlags(IntentFilter(SSL_CERT_PINNING_FAILED))
registerReceiverWithFlags(IntentFilter(ACCESS_OUTSIDE_WHITELIST))
registerReceiverWithFlags(IntentFilter(SSL_INCOMPATIBLE_CIPHER))
registerReceiverWithFlags(IntentFilter(SSL_INCOMPATIBLE_TLS))
registerReceiverWithFlags(IntentFilter(SSL_INVALID_CA_CHAIN))
registerReceiverWithFlags(IntentFilter(SSL_INVALID_RSA_SIGNATURE))
registerReceiverWithFlags(IntentFilter(SSL_INVALID_ECC_SIGNATURE))
registerReceiverWithFlags(IntentFilter(SSL_INVALID_DIGEST))
registerReceiverWithFlags(IntentFilter(BLOCKED_MANUFACTURER))
// Only available when ONEShield Threat Events are enabled
registerReceiverWithFlags(IntentFilter(TAMPERED_APP))
registerReceiverWithFlags(IntentFilter(EMULATOR_FOUND))
}
fun stop() {
context!!.unregisterReceiver(receiver)
}
}
Compatibility with Android 14 is seamless through Flutter EventChannel. Utilizing native platform implementations, the code sample provided above ensures that no modifications are needed to make your app fully compatible with Android 14.
Below is the list of metadata that can be associated with each mobile application, Threat-Event and Threat-Score in Flutter Apps.
| Threat-Event Context Keys | |
|---|---|
| message | Message displayed for the user on the event |
| externalID | The external ID of the event, which can be listened to via Threat Events |
| osVersion | OS version of the current device |
| deviceModel | Current device model |
| deviceManufacturer | The manufacturer of the current device |
| fusedAppToken | The task ID of the Appdome fusion of the currently running app |
| kernelInfo | Info about the kernel: system name, node name, release, version, and machine. |
| carrierPlmn | PLMN of the device |
| deviceID | Current device ID |
| reasonCode | Reason code of the occurred event |
| buildDate | Appdome fusion date of the current application |
| devicePlatform | OS name of the current device |
| carrierName | Carrier name of the current device |
| updatedOSVersion | Is the OS version up to date |
| deviceBrand | Brand of the device |
| deviceBoard | Board of the device |
| buildUser | Build user |
| buildHost | Build host |
| sdkVersion | Sdk version |
| timeZone | Time zone |
| deviceFaceDown | Is the device face-down |
| locationLong | Location longitude |
| locationLat | Location latitude |
| locationState | Location state |
| wifiSsid | Wifi SSID |
| wifiSsidPermissionStatus | Wifi SSID permission status |
Some or all of the meta-data for each mobile application Threat-Event and Threat-Score can be consumed in Flutter Apps at the discretion of the mobile developer and used, in combination with other mobile application data, to adapt the business logic or user experience when one or more attacks or threats are present.
Conditional Enforcement is an extension to Appdome’s mobile application Threat-Event framework. By using conditional enforcement, developers can control when Appdome enforcement of each mobile application protection takes place or invoke backup, failsafe, and enforcement to any in-app enforcement used by the mobile developer.
After you have implemented the required Threat-Event code in your Flutter Apps, you can confirm that the Appdome protections in the Flutter Apps properly recognize your Threat-Event implementation by reviewing the Certified Secure™ DevSecOps certificate for your build on Appdome.
In the Certified Secure DevSecOps certificate, an incorrect implementation of Threat-Events in your mobile application is displayed as shown below.
For information on how to retrieve the Certified Secure DevSecOps certification for your mobile application on Appdome, please visit the knowledge base article: Using Certified Secure™ Android & iOS Apps Build Certification in DevOps CI/CD
If you have any questions, please send them our way at support.appdome.com or via the chat window on the Appdome platform.
Thanks for visiting Appdome! Our mission is to secure every app on the planet by making mobile app security easy. We hope we’re living up to the mission with your project.
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