How to Retrieve Active Directory Usernames in PHP?

Retrieving Active Directory Usernames in PHP

When working with PHP web applications on intranets, retrieving the IP and hostname of a current user is relatively straightforward. However, obtaining their Active Directory or Windows username can be a challenge.

Solution

To retrieve the Active Directory/Windows username in PHP, inspect the AUTH_USER request variable. When present, it indicates the username of the authenticated user. However, it's worth noting that:

• If anonymous access is enabled, AUTH_USER will be empty.
• If basic or Windows integrated authentication is used, AUTH_USER will contain the username.

In Active Directory domains, when clients use Internet Explorer, provided the server and file system permissions are configured correctly, IE can silently submit the user's domain credentials to the server. As a result, AUTH_USER will contain the format MYDOMAINuser.name without manual user login to the web application.

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