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POSimulating input in Windows logon screen, using a driver
 

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    <p>I'm writing an open-source remote desktop tool, similar to VNC and TeamViewer. I've noticed that TeamViewer continues capturing the screen at the Switch Users or Workstation Locked screen - and allows the remote user to type in the password and unlock the workstation. I want to do the same.</p> <p>I've read:</p> <p><a href="https://stackoverflow.com/questions/2317880/updated-interacting-with-the-user-on-the-windows-logon-screen">Updated: Interacting with the user on the windows logon screen</a></p> <p><a href="https://stackoverflow.com/questions/9485530/capturing-image-during-windows-logon-invalid-password">https://stackoverflow.com/questions/9485530/capturing-image-during-windows-logon-invalid-password</a></p> <p><a href="https://stackoverflow.com/questions/1186900/adding-command-button-to-windows-logon-screen">Adding command button to Windows Logon screen</a></p> <p><a href="https://stackoverflow.com/questions/1583326/hook-a-hotkey-from-windows-logon-screen">hook a hotkey from windows logon screen</a></p> <p><a href="https://stackoverflow.com/questions/7183241/launch-windows-on-screen-keyboard-at-logon-screen-on-win7">https://stackoverflow.com/questions/7183241/launch-windows-on-screen-keyboard-at-logon-screen-on-win7</a></p> <p><a href="https://stackoverflow.com/questions/5979544/driver-to-simulate-keypress">Driver to Simulate Keypress</a></p> <p><a href="https://stackoverflow.com/questions/1011047/removing-windows-logon-screen-through-a-service">Removing Windows Logon screen through a service</a></p> <p><a href="https://stackoverflow.com/questions/9098156/how-to-catch-a-key-in-windows-7-logon-screen">How to catch a key in Windows 7 logon screen?</a></p> <p><a href="https://stackoverflow.com/questions/103427/displaying-window-on-logon-screen-using-c-sharp-in-windows-xp">Displaying Window on Logon Screen Using C# in Windows XP</a></p> <p>From these posts, I've gathered that simulating input in an isolated session definitely isn't a simple call to SendInput(). But is it possible using a driver (I believe it's specifically a keyboard filter driver, but I'm not sure)? If so, I'm thinking of writing, in C#, a service (so that it runs outside the user's session) that interacts with the Interception driver to simulate key presses. </p> <p>In response to: "why don't you just try it?", there isn't a .NET wrapper for Interception yet for me to test such a service, and so if the general consensus concludes that this isn't possible, I don't want to spend the time writing that .NET wrapper.</p> <p>I found <a href="http://oblita.com/Interception.html" rel="nofollow noreferrer">an keyboard driver called Interception (that will be released open-source in the future)</a>. You can directly <a href="https://github.com/oblitum/Interception/blob/master/windows/interception.c" rel="nofollow noreferrer">find the source here (the source is only the C communication API wrapper surrounding the actual kernel driver)</a>.</p> <p>Another question I have...I'm confused about what files make up a driver. His Interception DLL library programmed in C compiles to a .DLL. But aren't drivers of some .sys extension - how would you compile that Interception DLL into an actual driver - and then how would you install it?</p> <p><strong>EDIT:</strong> <a href="https://github.com/candera/kchordr" rel="nofollow noreferrer">A .NET wrapper does exist</a>. I modded the sample console app to type my entire password when I pressed the 'x' key, and it worked successfully - not only at the workstation locked screen, but also at the Windows logon screen. So it works.</p> <p><strong>Edit:</strong> <a href="https://github.com/jasonpang/Interceptor" rel="nofollow noreferrer">C# wrapper library for this keyboard driver is here</a>.</p>
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