https://github.com/forderud/reversepassword

A Windows Credential Provider written in C#
https://github.com/forderud/reversepassword

Last synced: 12 months ago
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A Windows Credential Provider written in C#

• Host: GitHub
• URL: https://github.com/forderud/reversepassword
• Owner: forderud
• License: mit
• Created: 2022-03-24T09:26:55.000Z (about 4 years ago)
• Default Branch: master
• Last Pushed: 2024-08-27T10:45:04.000Z (almost 2 years ago)
• Last Synced: 2024-08-27T11:57:32.330Z (almost 2 years ago)
• Language: C#
• Size: 243 KB
• Stars: 2
• Watchers: 0
• Forks: 0
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE

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README

          
Example Windows Credential Provider that require your password to by typed backwards. Written in C#.

## How to test

It's recommended to **test in a disposable Virtual Machine (VM)**, since credential provider problems might break the windows logon screen. You don't want to risk that on your main computer.

Build steps:

* Open solution in Visual Studio and build in release or debug mode.

* Copy `install.reg`, `uninstall.reg`, `REGISTER.bat` and `UNREGISTER.bat` into the same folder as the generated `ReversePassword.comhost.dll`.

Installation steps:

* Install [.NET 8 Desktop Runtime](https://dotnet.microsoft.com/en-us/download/dotnet)

* Right click on `REGISTER.bat` and select "Run as administrator".

* Log screen, log out or restart the computer.

* Observe that there's now a new "RP" sign-in option.

![screenshot](Screenshot.png)  

NOTE: You might need to run `CredUITester.exe` with admin privileges if not installed to a folder where all users have read access.

Uninstallation steps:

* Right click on `UNREGISTER.bat` and select "Run as administrator".

## Authentication and logon APIs

![CredUIPrompt](CredUIPrompt.png)  

* Show authentication dialog: [CredUIPromptForWindowsCredentials](https://learn.microsoft.com/en-us/windows/win32/api/wincred/nf-wincred-creduipromptforwindowscredentialsw)

* Logoff, shutdown or restart:  [ExitWindowsEx](https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-exitwindowsex)

## Background

The project is heavily based on the no longer maintained [CredProvider.NET](https://github.com/SteveSyfuhs/CredProvider.NET).