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    <p>Absolutely. This is especially useful for intranet applications.</p> <p>Since you did not specify your environment, I'll assume it is .NET, but that isn't the only way possible of course.</p> <p>Active Directory can be queried easily using <a href="http://en.wikipedia.org/wiki/LDAP" rel="nofollow noreferrer">LDAP</a>. If you're using .NET, you can do something like in <a href="http://www.codeproject.com/KB/system/QueryADwithDotNet.aspx" rel="nofollow noreferrer">this code example</a> or my example below. You can also do it within <a href="https://web.archive.org/web/1/http://articles.techrepublic%2ecom%2ecom/5100-22_11-5259887.html" rel="nofollow noreferrer">SQL environments</a> as well.</p> <p>If you just need Windows to handle authentication, you can set, for example, a .NET Web app up for <a href="http://weblogs.asp.net/scottgu/archive/2006/07/12/Recipe_3A00_-Enabling-Windows-Authentication-within-an-Intranet-ASP.NET-Web-application.aspx" rel="nofollow noreferrer">Windows Authentication</a>. Be sure to <a href="http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/524404dc-8586-46b0-89ac-0f5db6d33c9c.mspx?mfr=true" rel="nofollow noreferrer"><strong>turn off Anonymous Logins</strong></a> within IIS for your application. Once done, you'll be able to access the user's Windows logon name and use it to make further security checks (for example, their <a href="http://msdn.microsoft.com/en-us/library/4z6b5d42.aspx" rel="nofollow noreferrer">group/role membership</a> in AD).</p> <p>You can also simplify the whole mess using something like Enterprise Library's <a href="http://msdn.microsoft.com/en-us/library/cc309291.aspx" rel="nofollow noreferrer">Security Application Block</a>.</p> <hr> <p>Here is a short C# example: (convert to VB.NET <a href="http://www.developerfusion.com/tools/convert/csharp-to-vb/" rel="nofollow noreferrer">here</a>)</p> <pre><code>using System.DirectoryServices; /// &lt;summary&gt; /// Gets the email address, if defined, of a user from Active Directory. /// &lt;/summary&gt; /// &lt;param name="userid"&gt;The userid of the user in question. Make /// sure the domain has been stripped first!&lt;/param&gt; /// &lt;returns&gt;A string containing the user's email address, or null /// if one was not defined or found.&lt;/returns&gt; public static string GetEmail(string userid) { DirectorySearcher searcher; SearchResult result; string email; // Check first if there is a slash in the userid // If there is, domain has not been stripped if (!userid.Contains("\\")) { searcher = new DirectorySearcher(); searcher.Filter = String.Format("(SAMAccountName={0})", userid); searcher.PropertiesToLoad.Add("mail"); result = searcher.FindOne(); if (result != null) { email = result.Properties["mail"][0].ToString(); } } return email; } </code></pre> <p>You do not have to specify a domain controller. Performing the empty/default constructor for DirectorySearcher will cause it to attempt to look one up automatically &mdash; in fact, this is <a href="http://weblogs.asp.net/steveschofield/archive/2004/04/28/121857.aspx" rel="nofollow noreferrer"><strong>the preferred method</strong></a>.</p>
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    1. POHow to grab AD credentials from client machine in a web application?
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    1. USSean Hanley
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    1. COI tried to do something similar to what you describe, but don't you have to specify somewhere the path to Active Directory?
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      1. USGeoff
    2. CONope. If you don't, it will ask your local DNS for one. This is actually the preferred "scalable" approach. See my expanded/edited answer.
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    3. COI understood that no authentication was allowed -- the user can't even be prompted for integrated authentication. This can work, but certain conditions apply and it requires some set up in the web browser (IE).
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