Getting Windows Username With Javascript

I have a site which is built in ASP.net and C#. Let's call it webapp. it uses a Form system to log on into it, and cannot be changed easliy. I got a request to change the log in to

Solution 1:

<scriptlanguage="javascript">var username = '<%HttpContext.Current.User.Identity.Name %>';

</script>

Solution 2:

The only way you could get at the user's domain credentials via javascript would be by deploying some type of ActiveX component to expose that data to the browser. I wouldn't recommend that.

I would look at implementing a Login page for forms authentication that authenticates the user on the page load using HttpContext.Current.User.

The way forms works is that if an unauthenticated user attempts to access an access-controlled page and have not logged in (no cookie), they will be redirected to a login page that gives the facility to log in (this sets a cookie on the client-side). The user is then directed to the page they initially requested. You would simply be automating the login part.

If you have a mixture of pass-through and user who need to manually login you could check their client IP address to see if it matches one on your domain or not.

Solution 3:

The solution I found for getting the username sent to the server was:

string winlogon = Request.ServerVariables["LOGON_USER"];

After enabled Windows Authentication Mode in IIS.