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Oder die einfachste Möglichkeit: Alle Funktionen, die Cookies betreffen, aus der user.php löschen.

include/includes/func/user.php
<?php

# hier werden alle user spezifischen funktionen
# definert...

function user_identification () {
  user_auth();
  user_login_check();
  user_update_database();
  user_check_url_rewrite();
}

function user_auth () {
  debug ('user - auth gestartet'. session_id());
  $cn = session_und_cookie_name();
  if (!user_key_in_db()
   OR !isset($_SESSION['authid'])
   OR (isset($_SESSION['authsess']) AND $_SESSION['authsess'] != $cn)) {

    debug ('user - nicht in db oder nicht authid');

    user_set_guest_vars();
    user_set_user_online ();

    # gruppen, und modulzugehoerigkeit setzten
    user_set_grps_and_modules();
  }
}

function user_check_url_rewrite() {
  global $allgAr;
  if ( !loggedin() AND $allgAr['show_session_id'] == 0 ) {
    # loescht die sessionid von allen urls
    # auch urls wie formulare usw. damit
    # suchmaschienen bots nicht iritiert sind ;)
    # output_reset_rewrite_vars ist eine php funktion
    # nicht unnoetig dannach suchen ;) ...
    output_reset_rewrite_vars ();
  }
}

function user_update_database () {
  $dif = date('Y-m-d H:i:s', time() - 7200);
  db_query("UPDATE prefix_online SET uptime = now() WHERE sid = '".session_id()."'");
  db_query("DELETE FROM prefix_online WHERE uptime < '". $dif."'");
  if ( loggedin() ) {
    db_query("UPDATE prefix_user SET llogin = '".time()."' WHERE id = '".$_SESSION['authid']."'");
  }
}

function user_set_user_online () {
  global $allgAr;
  if (0 == db_result(db_query("SELECT COUNT(*) FROM prefix_online WHERE sid = '".session_id()."'"),0) ) {
    db_query("INSERT INTO prefix_online (sid,uptime,ipa) VALUES ('".session_id()."',now(),'".getip()."')");
  }
  $_SESSION['authgfx'] = $allgAr['gfx'];
}

function user_key_in_db() {
  if ( 1 == db_result(db_query("SELECT COUNT(*) FROM prefix_online WHERE sid = '".session_id()."'"),0) ) {
    return ( true );
  } else {
    return ( false );
  }
}

function session_und_cookie_name () {
  return (md5(dirname($_SERVER["HTTP_HOST"].$_SERVER["SCRIPT_NAME"]).DBPREF));
}

function user_login_check () {
  if ( isset ($_POST['user_login_sub']) AND isset ($_POST['name']) AND isset ($_POST['pass']) ) {
    debug ('posts vorhanden');
    $name = escape_nickname($_POST['name']);
    if ($name != $_POST['name'] OR strlen($_POST['name']) > 15) {
        return false;
    }
    $erg = db_query("SELECT name,id,recht,pass,llogin FROM prefix_user WHERE name = BINARY '".$name."'");
    if ( db_num_rows($erg) == 1 ) {
      debug ('user gefunden');
      $row = db_fetch_assoc($erg);
      if ( $row['pass'] == md5($_POST['pass']) ) {
        debug ('passwort stimmt ... '.$row['name']);
        $_SESSION['authname']  = $row['name'];
        $_SESSION['authid']    = $row['id'];
        $_SESSION['authright'] = $row['recht'];
        $_SESSION['lastlogin'] = $row['llogin'];
        $_SESSION['authsess']  = session_und_cookie_name();
        db_query("UPDATE prefix_online SET uid = ".$_SESSION['authid']." WHERE sid = '".session_id()."'");
        user_set_grps_and_modules();
        return (true);
      }
    }
    global $menu;
    $menu->set_url (0, 'user');
    $menu->set_url (1, 'login');
  }
  return ( false );
}

function user_set_guest_vars() {
  $_SESSION['authname']  = 'Gast';
  $_SESSION['authid']    = 0;
  $_SESSION['authright'] = 0;
  $_SESSION['lastlogin'] = time();
  $_SESSION['authgrp'] = array();
  $_SESSION['authmod'] = array();
  $_SESSION['authsess']  = session_und_cookie_name();
}

function user_markallasread () {
  $_SESSION['lastlogin'] = time();
}

function user_logout () {
  user_set_guest_vars();
  db_query("UPDATE prefix_online SET uid = ".$_SESSION['authid']." WHERE sid = '".session_id()."'");
}

function user_set_grps_and_modules () {
  $_SESSION['authgrp'] = array();
  $_SESSION['authmod'] = array();
  if ( loggedin() ) {
    $erg = db_query("SELECT gid FROM prefix_groupusers WHERE uid = ".$_SESSION['authid']);
    while ( $row = db_fetch_assoc ( $erg ) ) {
      $_SESSION['authgrp'][$row['gid']] = TRUE;
    }
    $erg = db_query("SELECT DISTINCT url
    FROM prefix_modulerights
    left join prefix_modules on prefix_modules.id = prefix_modulerights.mid
    WHERE uid = ".$_SESSION['authid']);
    while ( $row = db_fetch_assoc ( $erg ) ) {
      $_SESSION['authmod'][$row['url']] = TRUE;
    }
  }
}

function loggedin () {
  if ( has_right(-1) ) { return ( true ); } else { return ( false ); }
}
function is_admin () {
  if ( has_right(-9) ) { return ( true ); } else { return ( false ); }
}
function is_coadmin () {
  if ( has_right(-8) ) { return ( true ); } else { return ( false ); }
}
function is_siteadmin ($m = NULL) {
  if ( has_right(-7) ) { return ( true ); }
  if ( !is_null($m) AND has_right(NULL, $m)) { return (true); }
  return ( false );
}

# diese funktion liefert immer true wenn es ein admin ist.
# wenn kein kein admin wird geprueft ob der user
# entweder ein angegebenes recht oder in einer angegebene
# gruppe ist. oder ob er fals angegben das modulrecht hat.
# wenn eines von diesen 3 kriterien stimmt wird true ansonsten
# wenn keins uebereinstimmt false zurueck gegeben.
function has_right ($recht,$modul = '') {
  if ( !is_array($recht) AND !is_null($recht) ) {
    $recht = array ( $recht );
  }

  if ( $_SESSION['authright'] == -9 ) {
    return ( true );
  }

  if ( !is_null($recht) ) {
    foreach ( $recht as $v ) {
      if ( ($v <= 0 AND $v >= $_SESSION['authright'] ) OR (isset($_SESSION['authgrp'][$v]) AND $_SESSION['authgrp'][$v] === true) ) {
        return (true);
      }
    }
  }

  if ( !empty($modul) AND isset($_SESSION['authmod'][$modul]) AND $_SESSION['authmod'][$modul] === true ) {
    return ( true );
  }

  return (false);
}

### admin
# wenn der 2. parameter weggelassen wird oder auf true gesetzt wird
# dann wird ein login formular angezeigt, wenn der user kein admin ist.
# wird der parameter auf false gesetzt wird das login formular nicht angezeigt.
# erste parameter ist das menu objekt...
function user_has_admin_right (&$menu,$sl=true) {
  if ( $_SESSION['authright'] <= -8 ) {  # co leader...
    return ( true );
  } else {
    $uri_to_check1 = $menu->get(0);
    $uri_to_check2 = $menu->get(1);
	  if ( count($_SESSION['authmod']) < 1 OR !loggedin() ) {
		  if ( $sl === true ) {
        if ( !loggedin() ) {
          $tpl = new tpl ( 'user/login.htm' );
    	    $tpl->set_out('WDLINK','admin.php',0);
        } else {
          echo '<strong>Keine Berechtigung!</strong> <a href="index.php">Startseite</a>';
        }
      }
		  return ( false );
    } elseif ( (isset($_SESSION['authmod'][$uri_to_check1]) AND $_SESSION['authmod'][$uri_to_check1] == true)
              OR (isset($_SESSION['authmod'][$uri_to_check1.'-'.$uri_to_check2]) AND $_SESSION['authmod'][$uri_to_check1.'-'.$uri_to_check2] == true) ) {
      return ( true );
   	} elseif ( count($_SESSION['authmod']) > 0 AND loggedin() ) {
      if ( $sl === true ) {
        foreach($_SESSION['authmod'] as $k => $v ) { $x = $k; break; }
        $x = explode('-',$x);
        $menu->set_url (0, $x[0]);
        if ( isset($x[1]) ) {
          $menu->set_url (1, $x[1]);
        }
      }
      return ( true );
    }
  }
  return ( false );
}

function user_regist ($name, $mail, $pass) {
  global $allgAr, $lang;

  $erg = db_query("SELECT id FROM prefix_user WHERE name = BINARY '".$name."'");
  if (db_num_rows($erg) > 0) {
    return (false);
  }

  if ( $allgAr['forum_regist_user_pass'] == 0 ) {
		$new_pass = genkey(8);
  } else {
	  $new_pass = $pass;
	}

  $md5_pass = md5($new_pass);
	$confirmlinktext = '';

	# confirm insert in confirm tb not confirm insert in user tb
	if ( $allgAr['forum_regist_confirm_link'] == 1 ) {
		# confirm link + text ... bit of shit put it in languages file
	  $page = $_SERVER["HTTP_HOST"].$_SERVER["SCRIPT_NAME"];
		$id = md5 (uniqid (rand()));
		$confirmlinktext = "\n".$lang['registconfirm']."\n\n".sprintf($lang['registconfirmlink'], $page, $id );
		db_query("INSERT INTO prefix_usercheck (`check`,name,email,pass,datime,ak)
		VALUES ('".$id."','".$name."','".$mail."','".$md5_pass."',NOW(),1)");
  } else {
	  db_query("INSERT INTO prefix_user (name,pass,recht,regist,llogin,email,status,opt_mail,opt_pm)
		VALUES('".$name."','".$md5_pass."',-1,'".time()."','".time()."','".$mail."',1,1,1)");
		$userid = db_last_id();
	}
  $regmail = sprintf($lang['registemail'],$name, $confirmlinktext, $name, $new_pass);

	icmail($mail,'Anmeldung',$regmail); # email an user

  return (true);
}

function user_remove($uid){
    $row = @db_fetch_object(db_query("SELECT recht,avatar FROM prefix_user WHERE id = ".$uid));
    if ( $uid <> 1 AND ($_SESSION['authid'] == $uid OR $_SESSION['authid'] == 1 OR (is_coadmin() AND $_SESSION['authright'] < $row->recht))) {
        db_query("DELETE FROM prefix_user WHERE id = ".$uid);
        db_query("DELETE FROM prefix_userfields WHERE uid = ".$uid);
        db_query("DELETE FROM prefix_groupusers WHERE uid = ".$uid);
        db_query("DELETE FROM prefix_modulerights WHERE uid = ".$uid);
        db_query("DELETE FROM prefix_pm WHERE eid = ".$uid);
        db_query("DELETE FROM prefix_online WHERE uid = ".$uid);
        //Usergallery entfernen
        $sql = db_query("SELECT id,endung FROM prefix_usergallery WHERE uid = ".$uid);
        while( $r = db_fetch_object($sql) ){
            @unlink("include/images/usergallery/img_$r->id.$r->endung");
            @unlink("include/images/usergallery/img_thumb_$r->id.$r->endung");
        }
        db_query("DELETE FROM prefix_usergallery WHERE uid = ".$uid);
        //Avatar
        @unlink($row->avatar);
    }
}

function sendpm ($sid,$eid,$ti,$te,$status = 0) {
  if (is_array($eid)) {
  	db_query("INSERT INTO `prefix_pm` (`sid`,`eid`,`time`,`titel`,`txt`,`status`) ".
  	"SELECT  ".$sid.",`prefix_user`.`id`,'".time()."','".$ti."','".$te."',".$status." FROM `prefix_user` WHERE `prefix_user`.`id` IN (" . implode(',', $eid) . ")");
  } else {
  	db_query("INSERT INTO `prefix_pm` (`sid`,`eid`,`time`,`titel`,`txt`,`status`) VALUES (".$sid.",".$eid.",'".time()."','".$ti."','".$te."',".$status.")");
  }
}
?>
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