want windows log in user name in web services C# asp.net

Question

I have a web site from where I fire a mail to members in my offices

This mail have a yes no button.

on click of yes/no button I call a web service, my yes no link looks somewhat like this

<a href="http://xxxxx/xxxxx/votCatWSer.asmx/takevotingOpt?yesNo=yes&sNo=1">yes</a>

Now users i.e. my office staff will login their system open their outlook find this mail and then click it.

After they click, takevotingOpt method in my web service will be called. In this method I want to know, from which user this call has came. so that I can maintain record in database like xyz user has voted yes/no

say for e.g. their are two members in my organisation A and B

A's windows loginId is "AaLoginId" and

B's windows loginId is "BbLoginId"

both A and B receives the mail with the above mentioned link in it. when A click the yes/no link my web method should give me A's login Id i.e "AaLoginId". After I get this I make an entry in my database as A has voted yes.

I have tried below thing in my web service to get the user name but of no use please help.

tried this things to get windows login username.

        //string userName = System.Security.Principal.WindowsIdentity.GetCurrent().Name;
        //Uri uri = new Uri("http://tempuri.org/");
        //ICredentials credentials = CredentialCache.DefaultCredentials;
        //NetworkCredential credential = credentials.GetCredential(uri, "Ntlm");
        ////userName = credential.UserName;
        //userName = User.Identity.Name;
        //userName= System.Threading.Thread.CurrentPrincipal.Identity.Name;
        //userName = Context.Request.ServerVariables["LOGON_USER"].ToString();
        //userName = HttpContext.Current.User.Identity.Name.ToString();

I went to authentication in my inetmgr and enabled windows authentication for my hosted web service now it does what I want (userName = User.Identity.Name;) but it opens a browser window and ask for windows userid and password I dont want that It should pick up without login window.

Please help or suggest any other approach to achieve this.

Answer 1

You need to turn on windows authentication for the webservice and in IIS, then you should be able to look at Request object to get the user

Answer 2

Use Environment.UserName

Here's the MSDN docs. http://msdn.microsoft.com/en-us/library/system.environment.username.aspx

Edit - To retrieve all users logged into the current system, check out this Question/Answer - Logoff interactive users in Windows from a service

It shows a way to use WMI and through system DLLs to retrieve a list of logged in users on the current system (which may or may not include service accounts, I haven't tried it myself).

Edit - Using Integrated Security would work for what you're trying to achieve, but can be a bit tricky to setup in large corporations. To get rid of the login prompt, Internet Explorer auto-authenticates to sites in the "Intranet Zone", but does not auto-authenticate to sites in the "Internet Zone". Make sure your web service URL is Intranet based, i.e. http://myserver/ and not Internet based i.e http://myserver.mycorp.com/, unless the user's are within the same domain. If they are not, have the users add "*.mycorp.com" to the Intranet Zone. FireFox has a similar configuration, where specific sites must be "trusted" in order to auto-authenticate.