How to use DNS over TCP to Prevent MiTM Attacks in Android & iOS Apps

Last updated January 17, 2024 by Appdome

This Knowledge Base article describes how to use Appdome’s AI/ML in your CI/CD pipeline to continuously deliver plugins that Prevent blocking the transfer of DNS over TCP in Mobile apps.

Why Permit DNS over TCP?

Usually, DNS resolution is performed over UDP. This protocol enables a fast, stateless query-response model and is used by DNS to achieve rapid resolution and lookups between hostnames and IP addresses.

Nevertheless, in some cases it is preferable to resolve DNS queries over TCP, for the following reasons:

Operationally, the UDP payload is limited in size (up to 512b), while TCP has no such restriction. This means that on a single DNS TCP query you can return more hosts to IP resolutions than over UDP. This capability is a clear advantage for sites that have global resolution based on location.
From a security standpoint, DNSSEC can only reliably be applied over TCP.

How does Appdome implement DNS Transfer over TCP?

Applying DNS transfer over TCP can be complicated. Moreover, if your infrastructure fails to support TCP, or blocks DNS over TCP at the network layer, this may lead to resolution failure, application-level timeouts, or both.

Appdome’s Permit DNS over TCP feature enables this operation for Android and iOS apps without coding.

Prerequisites for Using Appdome's Permit DNS over TCP Plugins:

To use Appdome’s mobile app security build system to Prevent blocking the transfer of DNS over TCP , you’ll need:

Appdome account (create a free Appdome account here)
A license for Permit DNS over TCP
Mobile App (.ipa for iOS, or .apk or .aab for Android)
Signing Credentials (see Signing Secure Android apps and Signing Secure iOS apps)

How to Implement Prevent blocking the transfer of DNS over TCP in Mobile Apps Using Appdome

On Appdome, follow these 3 simple steps to create self-defending Mobile Apps that Prevent blocking the transfer of DNS over TCP without an SDK or gateway:

Designate the Mobile App to be protected.
1. Upload an app via the Appdome Mobile Defense platform GUI or via Appdome’s DEV-API or CI/CD Plugins.
2. Mobile App Formats: .ipa for iOS, or .apk or .aab for Android
3. Permit DNS over TCP is compatible with: Obj-C, Java, JS, C#, C++, Swift, Kotlin, Flutter, React Native, Unity, Xamarin, and more.
Select the defense: Permit DNS over TCP.

Create and name the Fusion Set (security template) that will contain the Permit DNS over TCP feature as shown below:

Figure 1: Fusion Set that will contain the Permit DNS over TCP feature

Follow the steps in Sections 2.2-2.2.2 of this article to add the Permit DNS over TCP feature to your Fusion Set via the Appdome Console.

When you select the Permit DNS over TCP you'll notice that the Fusion Set you created in step 2.1 now bears the icon of the protection category that contains Permit DNS over TCP.

Figure 2: Fusion Set that displays the newly added Permit DNS over TCP protection
Note: Annotating the Fusion Set to identify the protection(s) selected is optional only (not mandatory).

Open the Fusion Set Detail Summary by clicking the “...” symbol on the far-right corner of the Fusion Set. Copy the Fusion Set ID from the Fusion Set Detail Summary (as shown below):

Figure 3: Fusion Set Detail Summary

Follow the instructions below to use the Fusion Set ID inside any standard mobile DevOps or CI/CD toolkit like Bitrise, Jenkins, Travis, Team City, Circle CI or other system:

Refer to the Appdome API Reference Guide for API building instructions.

Look for sample APIs in Appdome’s GitHub Repository.

Add the Permit DNS over TCP feature to your security template.

Navigate to Build > Security tab > Secure Communication section in the Appdome Console.
Like all other options in ONEShield™, Permit DNS over TCP is turned on by default, as shown below:
Figure 4: Selecting Permit DNS over TCP
Note: The App Compromise Notification contains an easy to follow default remediation path for the mobile app end user. You can customize this message as required to achieve brand specific support, workflow or other messaging.

Toggle On > Permit DNS over TCP.

Figure 4: Selecting Prevent blocking the transfer of DNS over TCP
Note: The Appdome Platform displays the Mobile Operation Systems supported by each defense in real-time. For more details, see our OS Support Policy KB.

Configure the User Experience Options for Permit DNS over TCP:
With Threat-Events™ OFF, Appdome provides several user experience options for mobile brands and developers.

App Compromise Notification: Customize the pop-up or toast Appdome uses to notify the user when a threat is present while using the protected mobile app.

Short message Option. This is available for mobile devices that allow a banner notification for security events.

Localized Message Option. Allows Appdome users to support global languages in security notifications.

Figure 5: Default User Experience Options for Appdome’s blocking the transfer of DNS over TCP

Permit DNS over TCP Threat Code™. Appdome uses AI/ML to generate a unique code each time Permit DNS over TCP is triggered by an active threat on the mobile device. Use the code in Appdome Threat Resolution Center™ to help end users identify, find and resolve active threats on the personal mobile devices.

Initiate the build command either by clicking Build My App at the bottom of the Build Workflow (shown in Figure 4) or via your CI/CD as described in Section 2.1.4.

Congratulations! The Permit DNS over TCP protection is now added to the mobile app

Certify the Permit DNS over TCP feature in Mobile Apps

After building Permit DNS over TCP, Appdome generates a Certified Secure™ certificate to guarantee that the Permit DNS over TCP protection has been added and is protecting the app. To verify that the Permit DNS over TCP protection has been added to the mobile app, locate the protection in the Certified Secure™ certificate as shown below:

Figure 6: Certified Secure™ certificate

Each Certified Secure™ certificate provides DevOps and DevSecOps organizations the entire workflow summary, audit trail of each build, and proof of protection that Permit DNS over TCP has been added to each Mobile app. Certified Secure provides instant and in-line DevSecOps compliance certification that Permit DNS over TCP and other mobile app security features are in each build of the mobile app.

Using Threat-Events™ for blocking the transfer of DNS over TCP Intelligence and Control in Mobile Apps

Appdome Threat-Events™ provides consumable in-app mobile app attack intelligence and defense control when blocking the transfer of DNS over TCP is detected. To consume and use Threat-Events™ for blocking the transfer of DNS over TCP in Mobile Apps, use AddObserverForName in Notification Center, and the code samples for Threat-Events™ for blocking the transfer of DNS over TCP shown below.

The specifications and options for Threat-Events™ for blocking the transfer of DNS over TCP are:

Threat-Event™ Elements Prevent blocking the transfer of DNS over TCP Method Detail

Appdome Feature Name Permit DNS over TCP

Threat-Event Mode

OFF, IN-APP DEFENSE Appdome detects, defends and notifies user (standard OS dialog) using customizable messaging.

ON, IN-APP DETECTION Appdome detects the attack or threat and passes the event in a standard format to the app for processing (app chooses how and when to enforce).

ON, IN-APP DEFENSE Uses Appdome Enforce mode for any attack or threat and passes the event in a standard format to the app for processing (gather intel on attacks and threats without losing any protection).

Certified Secure™ Threat Event Check x

Visible in ThreatScope™ x

Developer Parameters for Preventing blocking the transfer of DNS over TCP Threat-Event™

Threat-Event NAME

Threat-Event DATA reasonData

Threat-Event CODE reasonCode

Threat-Event REF

Threat-Event SCORE
currentThreatEventScore Current Threat-Event score

threatEventsScore Total Threat-events score

Threat-Event Context Keys

message Message displayed for the user on event

failSafeEnforce Timed enforcement against the identified threat

externalID The external ID of the event which can be listened 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. Only available for Android devices.

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. Only available for Android.

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 conditioned by location permission

locationLat Location latitude conditioned by location permission

locationState Location state conditioned by location permission

wifiSsid Wifi SSID

wifiSsidPermissionStatus Wifi SSID permission status

threatCode The last six characters of the threat code specify the OS, allowing the Threat Resolution Center to address the attack on the affected device.

With Threat-Events™ enabled (turned ON), Mobile developers can get detailed attack intelligence and granular defense control in Mobile applications and create amazing user experiences for all mobile end users when blocking the transfer of DNS over TCP is detected.

The following is a code sample for native Mobile apps, which uses all values in the specification above for Permit DNS over TCP:

Important! Replace all placeholder instances of <Context Key> with the specific name of your threat event context key across all language examples. This is crucial to ensure your code functions correctly with the intended event data. For example, The <Context Key> could be the message, externalID, OS Version, reason code, etc.

IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(""); BroadcastReceiver threatEventReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { String message = intent.getStringExtra("message"); // Message shown to the user String reasonData = intent.getStringExtra("reasonData"); // Threat detection cause String reasonCode = intent.getStringExtra("reasonCode"); // Event reason code // Current threat event score String currentThreatEventScore = intent.getStringExtra("currentThreatEventScore"); // Total threat events score String threatEventsScore = intent.getStringExtra("threatEventsScore"); // Replace '' with your specific event context key // String variable = intent.getStringExtra(""); // Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...) } }; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) { registerReceiver(threatEventReceiver, intentFilter, Context.RECEIVER_NOT_EXPORTED); } else { registerReceiver(threatEventReceiver, intentFilter); }

xxxxxxxxxx
1
20
1
15
1
15
1
15

1
IntentFilter intentFilter = new IntentFilter();
2
intentFilter.addAction("");
3
BroadcastReceiver threatEventReceiver = new BroadcastReceiver() {
4
@Override
5
public void onReceive(Context context, Intent intent) {
6
String message = intent.getStringExtra("message"); // Message shown to the user
7
String reasonData = intent.getStringExtra("reasonData"); // Threat detection cause
8
String reasonCode = intent.getStringExtra("reasonCode"); // Event reason code
9

10
// Current threat event score
11
String currentThreatEventScore = intent.getStringExtra("currentThreatEventScore");
12

13
// Total threat events score
14
String threatEventsScore = intent.getStringExtra("threatEventsScore");
15

16
// Replace '<Context Key>' with your specific event context key
17
// String variable = intent.getStringExtra("<Context Key>");
18

19
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
20
}
21
};
22

23
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
24
registerReceiver(threatEventReceiver, intentFilter, Context.RECEIVER_NOT_EXPORTED);
25
} else {
26
registerReceiver(threatEventReceiver, intentFilter);
27
}

val intentFilter = IntentFilter() intentFilter.addAction("") val threatEventReceiver = object : BroadcastReceiver() { override fun onReceive(context: Context?, intent: Intent?) { var message = intent?.getStringExtra("message") // Message shown to the user var reasonData = intent?.getStringExtra("reasonData") // Threat detection cause var reasonCode = intent?.getStringExtra("reasonCode") // Event reason code // Current threat event score var currentThreatEventScore = intent?.getStringExtra("currentThreatEventScore") // Total threat events score var threatEventsScore = intent?.getStringExtra("threatEventsScore") // Replace '' with your specific event context key // var variable = intent?.getStringExtra("") // Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...) } } if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) { registerReceiver(threatEventReceiver, intentFilter, Context.RECEIVER_NOT_EXPORTED) } else { registerReceiver(threatEventReceiver, intentFilter) }

xxxxxxxxxx
1
20
1
15
1
15
1
15

1
val intentFilter = IntentFilter()
2
intentFilter.addAction("")
3
val threatEventReceiver = object : BroadcastReceiver() {
4
override fun onReceive(context: Context?, intent: Intent?) {
5
var message = intent?.getStringExtra("message") // Message shown to the user
6
var reasonData = intent?.getStringExtra("reasonData") // Threat detection cause
7
var reasonCode = intent?.getStringExtra("reasonCode") // Event reason code
8

9
// Current threat event score
10
var currentThreatEventScore = intent?.getStringExtra("currentThreatEventScore")
11

12
// Total threat events score
13
var threatEventsScore = intent?.getStringExtra("threatEventsScore")
14

15
// Replace '<Context Key>' with your specific event context key
16
// var variable = intent?.getStringExtra("<Context Key>")
17

18
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
19
}
20
}
21

22
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
23
registerReceiver(threatEventReceiver, intentFilter, Context.RECEIVER_NOT_EXPORTED)
24
} else {
25
registerReceiver(threatEventReceiver, intentFilter)
26
}

let center = NotificationCenter.default center.addObserver(forName: Notification.Name(""), object: nil, queue: nil) { (note) in guard let usrInf = note.userInfo else { return } let message = usrInf["message"]; // Message shown to the user let reasonData = usrInf["reasonData"]; // Threat detection cause let reasonCode = usrInf["reasonCode"]; // Event reason code // Current threat event score let currentThreatEventScore = usrInf["currentThreatEventScore"]; // Total threat events score let threatEventsScore = usrInf["threatEventsScore"]; // Replace '' with your specific event context key // let variable = usrInf[""]; // Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...) }

x
1
21
1
21
1
21
1
21

1
let center = NotificationCenter.default
2
center.addObserver(forName: Notification.Name(""), object: nil, queue: nil) { (note) in
3
guard let usrInf = note.userInfo else {
4
return
5
}
6

7
let message = usrInf["message"]; // Message shown to the user
8
let reasonData = usrInf["reasonData"]; // Threat detection cause
9
let reasonCode = usrInf["reasonCode"]; // Event reason code
10

11
// Current threat event score
12
let currentThreatEventScore = usrInf["currentThreatEventScore"];
13

14
// Total threat events score
15
let threatEventsScore = usrInf["threatEventsScore"];
16

17
// Replace '<Context Key>' with your specific event context key
18
// let variable = usrInf["<Context Key>"];
19

20
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
21
}

[[NSNotificationCenter defaultCenter] addObserverForName: @"" object:nil queue:nil usingBlock:^(NSNotification *org_note) { __block NSNotification *note = org_note; dispatch_async(dispatch_get_main_queue(), ^(void) { // Message shown to the user NSString *message = [[note userInfo] objectForKey:@"message"]; // Threat detection cause NSString *reasonData = [[note userInfo] objectForKey:@"reasonData"]; // Event reason code NSString *reasonCode = [[note userInfo] objectForKey:@"reasonCode"]; // Current threat event score NSString *currentThreatEventScore = [[note userInfo] objectForKey:@"currentThreatEventScore"]; // Total threat events score NSString *threatEventsScore = [[note userInfo] objectForKey:@"threatEventsScore"]; // Replace '' with your specific event context key // NSString *variable = [[note userInfo] objectForKey:@""]; // Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...) }); }];

xxxxxxxxxx
1
20
1
15
1
15
1
15

1
[[NSNotificationCenter defaultCenter] addObserverForName: @"" object:nil queue:nil usingBlock:^(NSNotification *org_note) {
2
__block NSNotification *note = org_note;
3
dispatch_async(dispatch_get_main_queue(), ^(void) {
4

5
// Message shown to the user
6
NSString *message = [[note userInfo] objectForKey:@"message"];
7

8
// Threat detection cause
9
NSString *reasonData = [[note userInfo] objectForKey:@"reasonData"];
10

11
// Event reason code
12
NSString *reasonCode = [[note userInfo] objectForKey:@"reasonCode"];
13

14
// Current threat event score
15
NSString *currentThreatEventScore = [[note userInfo] objectForKey:@"currentThreatEventScore"];
16

17
// Total threat events score
18
NSString *threatEventsScore = [[note userInfo] objectForKey:@"threatEventsScore"];
19

20
// Replace '<Context Key>' with your specific event context key
21
// NSString *variable = [[note userInfo] objectForKey:@"<Context Key>"];
22

23
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
24
});
25
}];

const { ADDevEvents } = NativeModules; const aDDevEvents = new NativeEventEmitter(ADDevEvents); function registerToDevEvent(action, callback) { NativeModules.ADDevEvents.registerForDevEvent(action); aDDevEvents.addListener(action, callback); } export function registerToAllEvents() { registerToDevEvent( "", (userinfo) => Alert.alert(JSON.stringify(userinfo)) var message = userinfo["message"] // Message shown to the user var reasonData = userinfo["reasonData"] // Threat detection cause var reasonCode = userinfo["reasonCode"] // Event reason code // Current threat event score var currentThreatEventScore = userinfo["currentThreatEventScore"] // Total threat events score var threatEventsScore = userinfo["threatEventsScore"] // Replace '' with your specific event context key // var variable = userinfo[""] // Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...) ); }

xxxxxxxxxx
1
20
1
15
1
15
1
15
2
29

1
const { ADDevEvents } = NativeModules;
2
const aDDevEvents = new NativeEventEmitter(ADDevEvents);
3

4
function registerToDevEvent(action, callback) {
5
NativeModules.ADDevEvents.registerForDevEvent(action);
6
aDDevEvents.addListener(action, callback);
7
}
8

9
export function registerToAllEvents() {
10
registerToDevEvent(
11
"",
12
(userinfo) => Alert.alert(JSON.stringify(userinfo))
13

14
var message = userinfo["message"] // Message shown to the user
15
var reasonData = userinfo["reasonData"] // Threat detection cause
16
var reasonCode = userinfo["reasonCode"] // Event reason code
17

18
// Current threat event score
19
var currentThreatEventScore = userinfo["currentThreatEventScore"]
20

21
// Total threat events score
22
var threatEventsScore = userinfo["threatEventsScore"]
23

24
// Replace '<Context Key>' with your specific event context key
25
// var variable = userinfo["<Context Key>"]
26

27
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
28
);
29
}

RegisterReceiver(new ThreatEventReceiver(), new IntentFilter("")); class ThreatEventReceiver : BroadcastReceiver { public override void OnReceive(Context context, Intent intent) { String message = intent.GetStringExtra("message"); // Message shown to the user String reasonData = intent.GetStringExtra("reasonData"); // Threat detection cause String reasonCode = intent.GetStringExtra("reasonCode"); // Event reason code // Current threat event score String currentThreatEventScore = intent.GetStringExtra("currentThreatEventScore"); // Total threat events score String threatEventsScore = intent.GetStringExtra("threatEventsScore"); // Replace '' with your specific event context key // String variable = intent.GetStringExtra(""); // Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...) } }

x
27

1
RegisterReceiver(new ThreatEventReceiver(), new IntentFilter(""));
2

3
class ThreatEventReceiver : BroadcastReceiver
4
{
5
public override void OnReceive(Context context, Intent intent)
6
{
7
// Message shown to the user
8
String message = intent.GetStringExtra("message");
9

10
// Threat detection cause
11
String reasonData = intent.GetStringExtra("reasonData");
12

13
// Event reason code
14
String reasonCode = intent.GetStringExtra("reasonCode");
15

16
// Current threat event score
17
String currentThreatEventScore = intent.GetStringExtra("currentThreatEventScore");
18

19
// Total threat events score
20
String threatEventsScore = intent.GetStringExtra("threatEventsScore");
21

22
// Replace '<Context Key>' with your specific event context key
23
// String variable = intent.GetStringExtra("<Context Key>");
24

25
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
26
}
27
}

NSNotificationCenter.DefaultCenter.AddObserver( (NSString)"", // Threat-Event Identifier delegate (NSNotification notification) { // Message shown to the user var message = notification.UserInfo.ObjectForKey("message"); // Threat detection cause var reasonData = notification.UserInfo.ObjectForKey("reasonData"); // Event reason code var reasonCode = notification.UserInfo.ObjectForKey("reasonCode"); // Current threat event score var currentThreatEventScore = notification.UserInfo.ObjectForKey("currentThreatEventScore"); // Total threat events score var threatEventsScore = notification.UserInfo.ObjectForKey("threatEventsScore"); // Replace '' with your specific event context key // var variable = notification.UserInfo.ObjectForKey(""); // Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...) } );

x

1
NSNotificationCenter.DefaultCenter.AddObserver(
2
(NSString)"", // Threat-Event Identifier
3
delegate (NSNotification notification)
4
{
5
// Message shown to the user
6
var message = notification.UserInfo.ObjectForKey("message");
7

8
// Threat detection cause
9
var reasonData = notification.UserInfo.ObjectForKey("reasonData");
10

11
// Event reason code
12
var reasonCode = notification.UserInfo.ObjectForKey("reasonCode");
13

14
// Current threat event score
15
var currentThreatEventScore = notification.UserInfo.ObjectForKey("currentThreatEventScore");
16

17
// Total threat events score
18
var threatEventsScore = notification.UserInfo.ObjectForKey("threatEventsScore");
19

20
// Replace '<Context Key>' with your specific event context key
21
// var variable = notification.UserInfo.ObjectForKey("<Context Keys>");
22

23
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
24
}
25
);

window.broadcaster.addEventListener("", function(userInfo) { var message = userInfo.message // Message shown to the user var reasonData = userInfo.reasonData // Threat detection cause var reasonCode = userInfo.reasonCode // Event reason code // Current threat event score var currentThreatEventScore = userInfo.currentThreatEventScore // Total threat events score var threatEventsScore = userInfo.threatEventsScore // Replace '' with your specific event context key // var variable = userInfo. // Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...) });

xxxxxxxxxx
1
20
1
15
1
15
1
15
2
29

1
window.broadcaster.addEventListener("", function(userInfo) {
2
var message = userInfo.message // Message shown to the user
3
var reasonData = userInfo.reasonData // Threat detection cause
4
var reasonCode = userInfo.reasonCode // Event reason code
5

6
// Current threat event score
7
var currentThreatEventScore = userInfo.currentThreatEventScore
8

9
// Total threat events score
10
var threatEventsScore = userInfo.threatEventsScore
11

12
// Replace '<Context Key>' with your specific event context key
13
// var variable = userInfo.<Context Keys>
14

15
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
16
});

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 { // Replace with your EventChannel name static const String _eventChannelName = ""; static const EventChannel _eventChannel = EventChannel(_eventChannelName); @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 String message = eventData['message']; // Message shown to the user String reasonData = eventData['reasonData']; // Threat detection cause String reasonCode = eventData['reasonCode']; // Event reason code // Current threat event score String currentThreatEventScore = eventData['currentThreatEventScore']; // Total threat events score String threatEventsScore = eventData['threatEventsScore']; // Replace '' with your specific event context key // String variable = eventData['']; }); } // Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...) }

x

1
import 'dart:async';
2
import 'package:flutter/material.dart';
3
import 'package:flutter/services.dart';
4

5
class PlatformChannel extends StatefulWidget {
6
const PlatformChannel({super.key});
7

8
@override
9
State<PlatformChannel> createState() => _PlatformChannelState();
10
}
11

12
class _PlatformChannelState extends State<PlatformChannel> {
13
// Replace with your EventChannel name
14
static const String _eventChannelName = "";
15
static const EventChannel _eventChannel = EventChannel(_eventChannelName);
16

17
@override
18
void initState() {
19
super.initState();
20
_eventChannel.receiveBroadcastStream().listen(_onEvent, onError: _onError);
21
}
22

23
void _onEvent(Object? event) {
24
setState(() {
25
// Adapt this section based on your specific event data structure
26
var eventData = event as Map;
27

28
// Example: Accessing 'externalID' field from the event
29
var externalID = eventData['externalID'];
30

31
// Customize the rest of the fields based on your event structure
32
String message = eventData['message']; // Message shown to the user
33
String reasonData = eventData['reasonData']; // Threat detection cause
34
String reasonCode = eventData['reasonCode']; // Event reason code
35

36
// Current threat event score
37
String currentThreatEventScore = eventData['currentThreatEventScore'];
38

39
// Total threat events score
40
String threatEventsScore = eventData['threatEventsScore'];
41

42
// Replace '<Context Key>' with your specific event context key
43
// String variable = eventData['<Context Keys>'];
44
});
45
}
46

47
// Your logic goes here (Send data to Splunk/Dynatrace/Show Popup...)
48
}

Using Appdome, there are no development or coding prerequisites to build secured Apps by using Permit DNS over TCP. There is no SDK and no library to code or implement in the app and no gateway to deploy in your network. All protections are built into each app and the resulting app is self-defending and self-protecting.

Releasing and Publishing Mobile Apps with Permit DNS over TCP

After successfully securing your app by using Appdome, there are several available options to complete your project, depending on your app lifecycle or workflow. These include:

Customizing, Configuring & Branding Secure Mobile Apps.

Deploying/Publishing Secure mobile apps to Public or Private app stores.

Releasing Secured Android & iOS Apps built on Appdome.

Related Articles:

Mobile MitM Attacks Explained

How to Enforce Minimum TLS Version, Prevent TLS/SSL Attacks in Android & iOS Apps

How to Use Trusted Root Certificates, Prevent MiTM Attacks in Android & iOS Apps

How Do I Learn More?

If you have any questions, please send them our way at support.appdome.com or via the chat window on the Appdome platform.

Thank you!

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.

How to use DNS over TCP to Prevent MiTM Attacks in Android & iOS Apps

Why Permit DNS over TCP?

How does Appdome implement DNS Transfer over TCP?

Prerequisites for Using Appdome's Permit DNS over TCP Plugins:

How to Implement Prevent blocking the transfer of DNS over TCP in Mobile Apps Using Appdome

Designate the Mobile App to be protected.

Upload an app via the Appdome Mobile Defense platform GUI or via Appdome’s DEV-API or CI/CD Plugins.

Select the defense: Permit DNS over TCP.

Add the Permit DNS over TCP feature to your security template.

Certify the Permit DNS over TCP feature in Mobile Apps

Using Threat-Events™ for blocking the transfer of DNS over TCP Intelligence and Control in Mobile Apps

Related Articles:

How Do I Learn More?

Thank you!

Stop AI-Based Attacks While Automating PCI DSS 4.0 Compliance

Supercharge the Experience in Mobile App Defense

Better User Experience in Mobile Defense

Shifting Dynamics in Mobile Fraud Prevention: A Call for Developer Responsibility

Threat-Event™ Elements	Prevent blocking the transfer of DNS over TCP Method Detail
Appdome Feature Name	Permit DNS over TCP
Threat-Event Mode
OFF, IN-APP DEFENSE	Appdome detects, defends and notifies user (standard OS dialog) using customizable messaging.
ON, IN-APP DETECTION	Appdome detects the attack or threat and passes the event in a standard format to the app for processing (app chooses how and when to enforce).
ON, IN-APP DEFENSE	Uses Appdome Enforce mode for any attack or threat and passes the event in a standard format to the app for processing (gather intel on attacks and threats without losing any protection).
Certified Secure™ Threat Event Check	x
Visible in ThreatScope™	x
Developer Parameters for Preventing blocking the transfer of DNS over TCP Threat-Event™
Threat-Event NAME
Threat-Event DATA	reasonData
Threat-Event CODE	reasonCode
Threat-Event REF
Threat-Event SCORE
currentThreatEventScore	Current Threat-Event score
threatEventsScore	Total Threat-events score

Threat-Event Context Keys
message	Message displayed for the user on event
failSafeEnforce	Timed enforcement against the identified threat
externalID	The external ID of the event which can be listened 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. Only available for Android devices.
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. Only available for Android.
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 conditioned by location permission
locationLat	Location latitude conditioned by location permission
locationState	Location state conditioned by location permission
wifiSsid	Wifi SSID
wifiSsidPermissionStatus	Wifi SSID permission status
threatCode	The last six characters of the threat code specify the OS, allowing the Threat Resolution Center to address the attack on the affected device.