This sample illustrates how to implement an authentication filter with ISAPI. The filter uses the HTTP_FILTER_AUTHENT structure to determine the unmapped username of the user accessing IIS. The filter then tries to map that username to a Windows NT user account.
If a match is not found, the filter returns an error, with SF_STATUS_REQ_ERROR, and the last error is set to ERROR_ACCESS_DENIED. If an Windows NT account match is found, the user is logged in to the server.
This sample is provided for educational purposes only. It has not been tested in a production environment, and Microsoft® will not provide technical support for it.
This project is available in the ...\iissamples\sdk\isapi\extensions\authentication subdirectory of the Internet services directory.