Actually I am looking at doing this by using a mod for apache called mod_auth_smb. I believe it is written in perl. It requires that you have the samba client libraries installed on the *nix system. Then you can install the module using:

perl -MCPAN -e'shell'
install Apache::AuthenSmb
[download]

This will install the stuff you need for authentication. Then I put in my httpd.conf file this line where I wanted the authentication point to be:

<Location >
    AuthName "Warning this is a restricted area"
    AuthType Basic
    PerlSetVar myPDC PDC.domain
    PerlSetVar myDOMAIN  domain
    PerlAuthenHandler  Apache::AuthenSmb
    require valid-user
</Location>
[download]

you need to change PDC.domain to your PDC server and your domain along with changing the domian on the next line. Because it passes these variables through to the authentication script. Also in your open Location tag you need to specify the location (acording to the webserver like /). Location can also be replaced by file directive to allow authentication to a file.

Hope this helps. </code>

--BigJoe

Learn patience, you must.
Young PerlMonk, craves Not these things.
Use the source Luke.