How to get the windows (logged in) username in Firefox using Javascript

Question

I am working on a very old web application(only for intranet usage). In the code, the developer is obtaining the logged in account via this

var wshNetwork = new ActiveXObject("WScript.Network"); document.getElementById('userId').value = wshNetwork.UserName;

This works only in IE. How can I get the logged in account in Firefox/chrome?

I have looked in to other thread (ex: Finding the currently logged in user from a Firefox extension ) but that's only for extension.

Are there any other ways to get the domain logged in username in Firefox/Chrome?

Answer 1

No, this is severely security-sensitive information - the main attack vector for compromising your computer. In IE it also only works for trusted websites such as localhost, or with special configuration for the local network - never on internet without additional configuration. Sandboxed JS will never be able to access this information - extensions are considered elevated.

Answer 2

This is something that I would do on server side. Providing you're using IIS, I would set the page to be using only Windows Authentication, read the current user on server side, and send it back to client via hidden field or javascript variable.