[Django]-Django / vBulletin single sign on

I doesn’t know Django, but when you are up to something like this, search for “bridges”.
There is a high chance someone have already done that for you.

These three source of information can also help you get through doing your own bridge:

Drupal Bridge
http://drupalcode.org/project/drupalvb.git/blob/9b5ab7b93043edfc2fe09c083cc9108344e26577:/drupalvb.inc.php

CakePHP Bridge
https://github.com/ceeram/static_bakery/blob/master/src/articles/2010/01/Vbulletin-Bridge-For-CakePHP.rst

Generic Bridge
http://www.saurdo.com/11/11/utilizing-the-vbulletin-database-in-your-main-site

Basically you need to look into cookies and match the session hash from vBulletin DB to assure user is logged in, and then you can gather all the user information.

Quoting the third link doing a Generig Bridge:

/* Check if session exist then return user id*/
function get_session($hash){

    dbconnect();

    $hash = mysql_real_escape_string($hash);


    $ip = implode('.', array_slice(explode('.', $_SERVER['REMOTE_ADDR']), 0, 4 - 1));
    $newidhash = md5($_SERVER['HTTP_USER_AGENT'] . $ip);

    $query = "SELECT * FROM session WHERE sessionhash = '".$hash."' LIMIT 1";
    $result = mysql_query($query);   

    if(mysql_num_rows($result) > 0){
        $row = mysql_fetch_array($result);

        $sessionhash = $row['sessionhash'];
        $idhash = $row['idhash'];
        $userid = $row['userid'];
        $lastactive = $row['lastactivity'];

        return ($idhash == $newidhash && (time() - $lastactive) < 900) ? $userid : false;
    }
    return false;   
}

Check cookie values in database:

function get_cookie($id, $pass){

    dbconnect();

    $id = mysql_real_escape_string($id);

    $query = "SELECT * FROM user WHERE userid = ".$id." LIMIT 1";
    $result = mysql_query($query);  

    if(mysql_num_rows($result) > 0){
        $row = mysql_fetch_array($result);
        $dbpass = $row['password'];

        // vb might change the salt from time to time. can be found in the /includes/functions.php file
        if(md5($dbpass . '0d582e0835ec6697262764ae6cb467fb') == $pass){
            return $id;
        }
    }
    return false;   
}

Wrap it all up to determine if user is logged:

function check_login(){
    if(isset($_COOKIE['bb_userid']) && isset($_COOKIE['bb_password'])){
        if(get_cookie($_COOKIE['bb_userid'], $_COOKIE['bb_password'])){
            return $_COOKIE['bb_userid'];
        }
    }
    if(isset($_COOKIE['bb_sessionhash'])){
        if(get_session($_COOKIE['bb_sessionhash'])){
            return get_session($_COOKIE['bb_sessionhash']);
        }
    }
    return false;
}

Retrieve user info to be displayed:

function user_info($id){
    dbconnect();
    $result = mysql_query("SELECT * FROM user WHERE userid = ".mysql_real_escape_string($id)." LIMIT 1";);
    return mysql_fetch_array($result);
}

And to conclude, use the above functions somewhere. Like this:

if($li = check_login()){
    dbconnect();
    $uinfo = user_info($li);

    $q_lastactivity = "UPDATE user SET lastactivity = '".time()."' WHERE userid = ".$li." LIMIT 1";
    mysql_query($q_lastactivity);

    if((time() - $uinfo['lastactivity']) > 900){
        $q_lastvisit = "UPDATE user SET lastvisit = '".$uinfo['lastactivity']."' WHERE userid = ".$li." LIMIT 1";
        mysql_query($q_lastvisit);  }
}

I hope it might help you doing some progress.