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🐦Flutter

Example: https://github.com/talsec/Free-RASP-Flutter/tree/master/example

📝 Prerequisites

The freeRASP has the following prerequisites that must be met before starting.

Android

freeRASP requires a minimum SDK level of 23. Some versions of Flutter projects, by default, support even lower levels of minimum SDK. This creates an inconsistency we must solve by updating the minimum SDK level of the application:

  • From the root of your project, go to android > app > build.gradle.

  • In defaultConfig, update minSdkVersion property to at least 23 (Android 6.0) or higher.

android/app/build.gradle
android {
    defaultConfig {
        minSdkVersion 23
    }
}

iOS

Xcode 15 is required to be able to build the application

Useful AppSec articles

📦 Install the plugin

Run the following command inside the project directory to add the freeRASP dependency:

flutter pub add freerasp

⚙️ Setup the Configuration for your App

To ensure freeRASP functions correctly, you need to provide the necessary configuration and initialize it. All required values must be filled in for the plugin to operate properly. Detailed descriptions of the configuration options are provided on the API page.

For Android apps, you must get your expected signing certificate hashes in Base64 form. You can go through this manual to learn how to sign your app in more detail, including manual signing and using Google's Play app signing.

In the entry point to your app, import freeRASP and add the following code:

main.dart
import 'package:freerasp/freerasp.dart';

void main() {

  // This line is important!
  WidgetsFlutterBinding.ensureInitialized();

  // create a configuration for freeRASP
  final config = TalsecConfig(
    /// For Android
    androidConfig: AndroidConfig(
      packageName: 'your.package.name',
      signingCertHashes: [
        'AKoRu...'
      ],
      supportedStores: ['com.sec.android.app.samsungapps'],
    ),

    /// For iOS
    iosConfig: IOSConfig(
      bundleIds: ['YOUR_APP_BUNDLE_ID'],
      teamId: 'M8AK35...',
    ),
    watcherMail: 'your_mail@example.com',
    isProd: true,
  );
}

It is necessary that Flutter Bindings are initialized. This can be satisfied by calling WidgetsFlutterBinding.ensureInitialized(), as shown in the code snippet above.

👷 Handle detected threats

freeRASP executes periodical checks when the application is running. You can handle the detected threats using listeners. For example, you can log the event, show a window to the user or kill the application. See the Threat detection in the wiki to learn more details about the performed checks and their importance for app security.

freeRASP reacts to threats using ThreatCallback. Internally, each threat has its own callback (of VoidCallback type), which is called when a threat is detected.

main.dart
import 'package:freerasp/freerasp.dart';

void main() {

  // Setting up callbacks
  final callback = ThreatCallback(
      onAppIntegrity: () => print("App integrity"),
      onObfuscationIssues: () => print("Obfuscation issues"),
      onDebug: () => print("Debugging"),
      onDeviceBinding: () => print("Device binding"),
      onDeviceID: () => print("Device ID"),
      onHooks: () => print("Hooks"),
      onPasscode: () => print("Passcode not set"),
      onPrivilegedAccess: () => print("Privileged access"),
      onSecureHardwareNotAvailable: () => print("Secure hardware not available"),
      onSimulator: () => print("Simulator"),
      onSystemVPN: () => print("System VPN"),
      onDevMode: () => print("Developer mode"),
      onADBEnabled: () => print("USB debugging enabled"),
      onUnofficialStore: () => print("Unofficial store")
  );

  // Attaching listener
  Talsec.instance.attachListener(callback);
}

🛡️ Start freeRASP

Start freeRASP to detect threats just by adding this line below the created config and the callback handler:

void main() async {

  // start freeRASP
  await Talsec.instance.start(config);
}

For the version you’re integrating, you can find the specific dSYMs for debugging in Releases.

🌁 Enable source code obfuscation

In order to provide as much protection as possible, freeRASP enhances security measures by implementing ProGuard consumer rules, which obfuscate specific sections of the SDK. However, these rules are applied to your Android app code as well due to inheritance.

In certain cases, you may prefer to exclude this rule.

To remove the rule, you need to find freerasp in your cache folder. More about where to find the cache folder here. Then navigate to the freerasp-X.Y.Z/android/build.gradle file and delete the line:

consumerProguardFiles 'consumer-rules.pro'

Read more about why obfuscation is important in the wiki.

☢️ (Optionally) Integrate freeMalwareDetection

freeMalwareDetection is a powerful feature designed to enhance the security of your Android application by quickly and efficiently scanning for malicious or suspicious applications (e.g. Android malware) based on various blacklists and security policies.

It helps to detect apps with suspicious package names, hashes, or potentially dangerous permissions.

Visit the freeMalwareDetection repository to learn more about this feature! For the integration, refer to the integration guide for the Flutter platform.

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