NTLM authentication for MediaWiki

Based on a post from David Cameron (19 Feb 2005) I've hacked up the
following modification to loadFromSession (in User.php) which allows
authentication against our NTLM database (based on the variable AUTH_USER
passed from IIS).

I'm trying to avoid hacking the code for 1.4 so if you know a way to achieve
this without modifying User.php (or another core file) then feedback would
be most appreciated.

Cheers,

al.


        /**
         * Read datas from session
         * @static
         */
        function loadFromSession() {
        global $wgMemc, $wgDBname;

        if ( isset( $_SESSION['wsUserID'] ) ) {
                if ( 0 != $_SESSION['wsUserID'] ) {
                        $sId = $_SESSION['wsUserID'];
                } else {
                        return new User();
                }
        } else if ( isset( $_COOKIE["{$wgDBname}UserID"] ) ) {
                $sId = IntVal( $_COOKIE["{$wgDBname}UserID"] );
                $_SESSION['wsUserID'] = $sId;
        } else if ( isset($_SERVER["AUTH_USER"])) {
                //Rembrandt modification to allow logon via authentication
information
              //passed from IIS
              global $wgUser;
              global $wgDeferredUpdateList;
      
              //get the username
              $temp = explode('DOMAINNAME', $_SERVER["AUTH_USER"]); //remove
the domain name from AUTH_USER
              $name = $temp[1];

              //pull in the usernames and passwords we'll need for the
database lookup
              global $wgDBprefix;
              global $wgDBuser;
              global $wgDBpassword;
              global $wgDBserver;
              global $wgDBname;

              //we'll use PHP's MYSQL module to access the mediawiki
database as it's Q&D
              mysql_connect($wgDBserver,$wgDBuser,$wgDBpassword);
              @mysql_select_db($wgDBname) or die( "Unable to select user
database for NTLM authentication");
              $query="SELECT * FROM " . $wgDBprefix . "user WHERE
LOWER(user_name) = '" . strtolower($name) . "'";
              $result = mysql_query($query);
              $row = mysql_fetch_array($result, MYSQL_ASSOC);
              mysql_close();
            
              //set the variables we need to transparently authenticate
              $sId                    = $row['user_id'];
              $_SESSION['wsUserID']   = $row['user_id'];
                $_SESSION['wsUserName'] = $row['user_name'];
                $_SESSION['wsToken']    = $row['user_token'];

    } else {
                return new User();
                }
                if ( isset( $_SESSION['wsUserName'] ) ) {
                        $sName = $_SESSION['wsUserName'];
                } else if ( isset( $_COOKIE["{$wgDBname}UserName"] ) ) {
                        $sName = $_COOKIE["{$wgDBname}UserName"];
                        $_SESSION['wsUserName'] = $sName;
                } else {
                        return new User();
                }

                $passwordCorrect = FALSE;
                $user = $wgMemc->get( $key = "$wgDBname:user:id:$sId" );
                if($makenew = !$user) {
                        wfDebug( "User::loadFromSession() unable to load
from memcached\n" );
                        $user = new User();
                        $user->mId = $sId;
                        $user->loadFromDatabase();
                } else {
                        wfDebug( "User::loadFromSession() got from cache!\n"
);
                }

                if ( isset( $_SESSION['wsToken'] ) ) {
                        $passwordCorrect = $_SESSION['wsToken'] ==
$user->mToken;
                } else if ( isset( $_COOKIE["{$wgDBname}Token"] ) ) {
                        $passwordCorrect = $user->mToken ==
$_COOKIE["{$wgDBname}Token"];
                } else {
                        return new User(); # Can't log in from session
                }

                if ( ( strtolower($sName) == strtolower($user->mName) ) &&
$passwordCorrect ) { //modified to allow for case differences between
mediawiki and NTLM usernames
                        if($makenew) {
                                if($wgMemc->set( $key, $user )) {
                                        wfDebug( "User::loadFromSession()
successfully saved user\n" );
                                } else {
                                        wfDebug( "User::loadFromSession()
unable to save to memcached\n" );
                                }
                        }
                        $user->spreadBlock();
                        return $user;
                }


                return new User(); # Can't log in from session
        }