In den nächsten Tagen folgen noch die Adapter für tine20.org und Roundcube.
Code, damit das aktuelle Mediawiki mit dem SingleSignOn für TYPO3 funktioniert.

<?php
/*
* Signature-Based Single Sign-On Framework
* TPA Adapter for
* Mediawiki ( http://wikipedia.sourceforge.net )
*
*  Version            : 0.4
*  Last update        : 29.12.2009
*  License            : GPL
*
*  (c) Kay Strobach, Bannewitz, Germany
*  http://www.kay-strobach.de
*/

	//tell mediawiki, that it's startet properly
		define( 'MEDIAWIKI', true );
	//disable transactions -> there where problems with them ...
		define('DBO_TRX'   , false);
	//include libs
		$IP = dirname(__FILE__);
		include_once(dirname(__FILE__).'/includes/WebStart.php');
	//load db
		$wgDatabase = Database::newFromParams( $wgDBserver, $wgDBuser , $wgDBpassword, $wgDBname, 1 );

/**
 *  function which is called after including this file in the SSO-Agent.
 *
 *  @param
 *    User_Name    string    Username the Session will be created for
 *    remote_addr  string    Remoteaddress of the users system
 *    agent        string    Browser
 *    sso_url      string    Url where the user will be redirected after establishing a session for him
 *
 *  @return        string    return the session data
 *
 *  Leave stubs if you dont need all four params.
 */
	function sso($User_Name,$remote_addr,$agent,$sso_url,$sso_version="",$sso_action="",$sso_userdata="") {
		//do basic check
			if ($sso_version == "") return array("Error"=>"sso version out of date");
		//unpack userdata
			$sso_userdata   = process_userdata($sso_userdata);
		//init global vars
			global $wgDefaultUserOptionsEn;
			global $wgNamespacesToBeSearchedDefault;
			global $wgDeferredUpdateList;
			global $wgAuth;
			global $wgUser;
			global $wgLang;
			global $wgTitle;
			global $wgMemc;
			global $wgDBserver,$wgDBname,$wgDBuser,$wgDBpassword;
			global $wgCookieExpiration, $wgCookiePath, $wgCookieDomain;
			global $trans;
			global $wgInputEncoding;
			global $wgCapitalLinks;
			global $wgUseLatin1, $IP;
			global $wgDefaultUserOptions;
			global $wgLoadBalancer;
			global $wgContLang;
			global $wgVersion;
			global $wgRequest;
			global $wgDatabase;
			global $wgCommandLineMode;
			global $wgPostCommitUpdateList;

		// load configuration
			#include_once(dirname(__FILE__).'/index.php');
		// Memcached support; for the session setup, use the fake one
			//Language::loadLocalisation('en',true);
		//init auth plugin
			$wgAuth = new AuthPlugin();
		// Initialize MediaWiki base class
			$wgRequest = new WebRequest();
			$action = $wgRequest->getVal( 'action', 'view' );
			$title  = $wgRequest->getVal( 'title' );
		//react on action
			$User_Name = USER::getCanonicalName($User_Name,false);

			switch($sso_action){
				case 'create_modify':
					$wgUser = User::newFromName( $User_Name );
					if( is_null( $wgUser ) ) {
						return;
					}
					if($wgUser->idForName()==0) {
						$wgUser->addToDatabase();
					}
					//setup user credentials
					$wgUser->setName($User_Name);
					$wgUser->setEmail($sso_userdata['email']);
					$wgUser->setRealName($sso_userdata['name']);
					$wgUser->setPassword( md5(microtime(true)) );
					//trust the tpa email
					$wgUser->confirmEmail();
					//check wether user isAdmin -> if yes add to group admin

					//save user data
					$wgUser->saveSettings();
				break;
				// perform logon for given $User_Name
				case 'logon':
					//getUserId
						$wgUser = User::newFromName( $User_Name );
						if( is_null( $wgUser ) ) {
							return array("Error"=>"no account for this user - object not initiated");
						}
						$id = $wgUser->idForName();
					// check if user exists in db
						if ($id=="0") {
							// no user found, return error
							$error=array("Error" => "no account for this user - id==0");
							return $error;
						}
						else {
							$wgUser->setId( $id );
							$wgUser->loadFromDatabase();
							wfSetupSession();
							$wgUser->saveSettings();
							// valid username, start the session
							$wgUser->setOption( "rememberpassword", "0" );
							$wgUser->setCookies();

							// prepare sessiondata return-values
						    	// Sessiondata is stored in this Format :
						    	// Array(
						    	//	[redirecturl] => $redirecturl
						    	//	[0] => Array(
						    	//		"CookieName" => $cookiename
						    	//		"CookieValue" => $cookievalue
						    	//		"CookieExpires" => $expires
						    	//		)
						    	//	[1] => Array(
						    	//		"Cookiename" => $cookiename
						    	//		... and so on
						    	//		)
						    	// [1] if you need to pass more than one cookie
						    	//
								$return_val[0] = array();
						    	$return_val += array( "redirecturl" => $sso_url.'?'.session_name().'='.session_id());
						        #print_r($return_val);
								// pass session data to the SSO-Agent
						        #die('<a href="'.$return_val['redirecturl'].'">link</a>');
					        	return $return_val;
						}
				break;
			}
	}
/*
 * return the protocol version
 */
	function get_version(){
		return "2.0";
	}

/*
 * process the userdata string and return an associative array
 *
 * @param string $sso_userdata: the data from fe_users (pipe-separated)
 * @return array	$data: the userdata
 */
	function process_userdata($sso_userdata){
		$sso_userdata = split("\|",$sso_userdata);
		for ($i=0;$i<count($sso_userdata);$i++) {
			$sso_userdata[$i]=split("=",$sso_userdata[$i]);
			$data[$sso_userdata[$i][0]]=$sso_userdata[$i][1];
		}
		unset ($sso_userdata);
		return $data;
	}
?>