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yubikey-removal-tool

This is code examples on how a YubiKey Removal behaviour can be implemented in Windows 10/11. This is C# code using the Yubico Desktop SDK. This tool is built for YubiKeys and then it can be run as a standard user in Windows, but to be able to get info from a SecurityKey or a YubiKey Bio Administrative rights is needed due to how Microsoft has designed FIDO access and how the Yubico Enterprise SDK is leverage that.

Basic Usage

Yubico Lock Tool used as example to lock the computer if YubiKey is removed Yubico Logout Tool used as example to log out the user if YubiKey is removed

Pre-requisites:

This should be developed and run on Windows 10 or Windows 11.

  • Download and Install Visual Studio
  • Download or fetch this code from Github

Build

  1. After all pre-requisites are installed and downloaded, open Visual Studio.
  2. Build the code and publish the exe-file
  3. Find the exe fil in Explorer
  4. Double click on the exe and test how it works.

Example - How to start automatic on logon

To make this code little bit better and to make it start on startup you can add these things:

  1. Make a shortcut and add that into the startup folder, which makes it run directly on startup. Here is how you do that:
  • Create a shortcut of the YubicoLockTool.exe or YubicoLogoutTool.exe
  • Move the shortcut to the desktop and rename as you like
  • Open the Run command (Windows Logo + R or search for Run)
  • Write shell:startup and press Enter
  • Drag the shortcut into the Startup folder

  1. Change the YubicoLockTool.cs or YubicoLogoutTool.cs to have those lines (Replace [ExampleClass] below with correct class name):

     using System.Runtime.InteropServices;
 namespace Yubico;

 class [ExampleClass] {
   [DllImport("kernel32.dll")]
   static extern IntPtr GetConsoleWindow();

   [DllImport("user32.dll")]
   static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

 public static void Main() {
   var handle = GetConsoleWindow();

   // Hide
   ShowWindow(handle, 0);

   ...

News

  • Latest version has a better YubiKey Information class for accurancy of YubiKey models.
  • Latest version also has a log tool

License

Yubico Removal Tool is provided under the Apache License 2.0.