How to Secure Android & iOS Apps with Pin to Host

Last updated July 31, 2024 by Appdome

Learn to Use Pin to Host in Mobile apps, in mobile CI/CD with a Data-Driven DevSecOps™ build system.

What is Pin to Host?

Pin to Host is an advanced Appdome MobileBOT™ Defense feature designed to fortify mobile applications against a range of cyber attacks by establishing a more secure and controlled communication channel between the app and its designated server. Building on the principles of Secure Certificate Pinning, which focuses on validating the server’s SSL certificate against a known set of certificates embedded in the app, Pin to Host goes a step further by incorporating advanced security measures. These include enforcing specific cipher suites, TLS (Transport Layer Security) versions, and the integration of session headers. This combination of security measures ensures that mobile applications can securely connect to their designated servers, not just by verifying the server’s certificate but also by ensuring that the communication employs the most secure and up-to-date encryption standards. Through this comprehensive approach, Pin to Host offers a tighter security loop, significantly enhancing the application’s ability to protect data during transmission.

Why Pin to Host is Essential for Mobile App Security?

The adoption of Pin to Host is particularly beneficial in protecting mobile apps against various cyber threats, such as man-in-the-middle (MITM) attacks, where attackers intercept and potentially alter the communication between the app and its server. By enforcing the use of pre-defined cipher suites and TLS versions, Pin to Host minimizes the risks associated with weak encryption algorithms and outdated security protocols, which are common entry points for hackers. Furthermore, Pin to Host’s compatibility with Session Headers adds an additional layer of security, ensuring that each session is uniquely authenticated and encrypted. This is especially important in scenarios where sensitive information, such as personal data and financial transactions, is transmitted between the app and the server. By leveraging the advanced capabilities of Pin to Host, app developers can provide a safer environment for their users, instilling confidence and ensuring a secure user experience across both iOS and Android mobile applications.

 

Note: Please be aware that the Security Certificate Pinning and the Anti Bot Pin to Host are mutually exclusive. Implementing them together will result in a conflict within the engine. Ensure to use only one method at a time to avoid potential issues.

Note: If you’d like to use Deep Proxy Detection in conjunction with Pin to Host, you’ll need to activate the feature toggle.

Note: When Pin to Host User Notifications are set, they apply to all protected hosts that are using Pin to Host.

 

Prerequisites for Using Pin to Host:

To use Appdome’s mobile app security build system to Use Pin to Host , you’ll need:

Use Pin to Host on Mobile apps using Appdome

On Appdome, follow these 3 simple steps to create self-defending Mobile Apps that Use Pin to Host without an SDK or gateway:

  1. Upload the Mobile App to Appdome.

    1. Upload an app to Appdome’s Mobile App Security Build System

    2. Upload Method: Appdome Console or DEV-API
    3. Mobile App Formats: .ipa for iOS, or .apk or .aab for Android
    4. Pin to Host Compatible With: Obj-C, Java, JS, C#, C++, Swift, Kotlin, Flutter, React Native, Unity, Xamarin, and more
  2. Build the feature: Pin to Host.

    1. Building Pin to Host by using Appdome’s DEV-API:

      1. Create and name the Fusion Set (security template) that will contain the Pin to Host feature as shown below:
      2. fusion set that contains Pin to Host

        Figure 1: Fusion Set that will contain the Pin to Host feature
        Note: Naming the Fusion Set to correspond to the protection(s) selected is for illustration purposes only (not required).

      3. Follow the steps in Sections 2.2.1-2.2.2 of this article, Building the Pin to Host feature via Appdome Console, to add the Pin to Host feature to this Fusion Set.

      4. 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): fusion Set Detail Summary image

        Figure 2: Fusion Set Detail Summary
        Note: Annotating the Fusion Set to identify the protection(s) selected is optional only (not mandatory).

      5. Follow the instructions below to use the Fusion Set ID inside any standard mobile DevOps or CI/CD toolkit like Bitrise, App Center, Jenkins, Travis, Team City, Circle CI or other system:
        1. Build an API for the app – for instructions, see the tasks under Appdome API Reference Guide
        2. Look for sample APIs in Appdome’s GitHub Repository
    2. Building the Pin to Host feature via Appdome Console

      To build the Pin to Host protection by using Appdome Console, follow the instructions below.

      1. Where: Inside the Appdome Console, go to Build > Anti Bot Tab > Secure Communication section.
      2. How: Check whether is toggled On (enabled), otherwise enable it . The feature Pin to Host is enabled by default, as shown below. Toggle (turn ON) Pin to Host, as shown below. Pin to Host option

        Figure 3: Use Pin to Host option

      3. When you select the Pin to Host you'll notice that your Fusion Set you created in step 2.1.1 now bears the icon of the protection category that contains Pin to Host

        Fusion Set applied Pin to Host

        Figure 4: Fusion Set that displays the newly added Pin to Host protection

      4. Select the Threat-Event™ in-app mobile Threat Defense and Intelligence policy for Pin to Host:
        1. Threat-Events™ OFF > In-App Defense

          If the Threat-Events™ setting is cleared (not selected). Appdome will detect and defend the user and app by enforcing Use Pin to Host.

        2. Threat-Events™ ON > In-App Detection

          When this setting is used, Appdome detects the Certificate Pinning has failed and passes Appdome’s Threat-Event™ attack intelligence to the app’s business logic for processing, enforcement, and user notification. For more information on consuming and using Appdome Threat-Events™ in the app, see section Using Threat-Events™ for Pin to Host Intelligence and Control in Mobile Apps.

        3. Threat-Events™ ON > In-App Defense

          When this setting is used, Appdome detects and defends against Pin to Host (same as Appdome Enforce) and passes Appdome’s Threat-Event™ attack intelligence the app’s business logic for processing. For more information on consuming and using Appdome Threat-Events™ in the app, see section Using Threat-Events™ for Pin to Host Intelligence and Control in Mobile Apps.

      5. Click Build My App at the bottom of the Build Workflow (shown in Figure 3).
    Congratulations!  The Pin to Host protection is now added to the mobile app
  3. Certify the Pin to Host feature in Mobile Apps

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

    Figure 5: 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 Pin to Host has been added to each Mobile app. Certified Secure provides instant and in-line DevSecOps compliance certification that Pin to Host and other mobile app security features are in each build of the mobile app

Using Threat-Events™ for Pin to Host Intelligence and Control in Mobile Apps

Appdome Threat-Events™ provides consumable in-app mobile app attack intelligence and defense control when Pin to Host is detected. To consume and use Threat-Events™ for Pin to Host in Mobile Apps, use AddObserverForName in Notification Center, and the code samples for Threat-Events™ for Pin to Host shown below.

The specifications and options for Threat-Events™ for Pin to Host are:

Threat-Event™ Elements Use Pin to Host Method Detail
Appdome Feature Name Pin to Host
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
Visible in ThreatScope™
Developer Parameters for Using Pin to Host Threat-Event™
Threat-Event NAME MobileBotDefensePinToHostCertificatePinningFailed
Threat-Event DATA reasonData
Threat-Event CODE reasonCode
Threat-Event REF 6801
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

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 Pin to Host is detected.


The following is a code sample for native Mobile apps, which uses all values in the specification above for Pin to Host:


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.



Using Appdome, there are no development or coding prerequisites to build secured Mobile Apps by using Pin to Host. 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 Pin to Host

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:

Related Articles:

How to Use Appdome MobileBOT™ Defense

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

How to Enforce SSL TLS Cipher Suites 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.

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