inc/security.php (c208bd9) - webinterface.git

security.php

<?php
/*
This file belongs to the Webinterface of schokokeks.org Hosting

Written 2008-2012 by schokokeks.org Hosting, namely
  Bernd Wurst <bernd@schokokeks.org>
  Hanno Böck <hanno@schokokeks.org>

To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public domain worldwide. This software is distributed without any warranty.

You should have received a copy of the CC0 Public Domain Dedication along with this software. If not, see 
http://creativecommons.org/publicdomain/zero/1.0/

Nevertheless, in case you use a significant part of this code, we ask (but not require, see the license) that you keep the authors' names in place and return your changes to the public. We would be especially happy if you tell us what you're going to do with this code.
*/

require_once('inc/error.php');

function strong_password($password)
{
  if ($password == '' || strlen($password) < 4) {
    DEBUG("Passwort zu kurz!");
    return "Passwort ist zu kurz!";
  }

if (! function_exists("crack_opendict"))
  {
    DEBUG("cracklib not available!");
    return true;
  }
  if (config('use_cracklib') === NULL or config('use_cracklib') === false) {
    DEBUG('Cracklib deaktiviert');
    return true;
  }
  DEBUG("Öffne Wörterbuch: ".config('cracklib_dict'));
  if (! ($dict = crack_opendict(config('cracklib_dict'))))
  {
    logger(LOG_ERR, "inc/security", "cracklib", "could not open cracklib-dictionary »".config('cracklib_dict')."«");
    system_failure("Kann Crack-Lib-Wörterbuch nicht öffnen: ".config('cracklib_dict'));
  }
  // Führe eine Überprüfung des Passworts durch
  $check = crack_check($dict, $password);

$message = crack_getlastmessage();
  crack_closedict($dict);

if ($check === True)
  {
    DEBUG("Passwort ok");
    return true;
  }
  else
  {
    DEBUG("Passwort nicht ok: {$message}");
    return $message;
  }
}

function filter_input_general( $input )
{
  return htmlspecialchars(iconv('UTF-8', 'UTF-8', $input), ENT_QUOTES, 'UTF-8');
}

function verify_input_general( $input )
{
  if (filter_input_general($input) != $input) {
    system_failure("Ihre Daten enthielten ungültige Zeichen!");
    logger(LOG_WARNING, 'inc/security', 'verify_input_general', 'Ungültige Daten: '.$input);
  }
}

function filter_input_username( $input )
{
  return preg_replace("/[^[:alnum:]\_\.\+\-]/", "", $input );
}

function verify_input_username( $input )
{
  if (filter_input_username( $input ) != $input) {
    logger(LOG_WARNING, 'inc/security', 'verify_input_username', 'Ungültige Daten: '.$input);
    system_failure("Ihre Daten enthielten ungültige Zeichen!");
  }
}

function filter_input_hostname( $input, $wildcard=false )
{
  // FIXME: Eine "filter"-Funktion sollte keinen system_failure verursachen sondern einfach einen bereinigten String liefern.
  
  $input = str_replace(array('Ä', 'Ö', 'Ü'), array('ä', 'ö', 'ü'), strtolower($input));
  $input = rtrim($input, "\t\n\r\x00 .");
  $input = ltrim($input, "\t\n\r\x00 .");
  if (preg_replace("/[^[:alnum:]äöü*\.\-]/", "", $input ) != $input)
    system_failure("Ihre Daten enthielten ungültige Zeichen!");
  if (preg_match("/^.+\*/", $input ))
    system_failure("Ihre Daten enthielten ungültige Zeichen (Wildcard-Stern muss ganz vorne stehen)!");
  if (! $wildcard && preg_replace("/^\*/", "", $input ) != $input)
    system_failure("Ihre Daten enthielten ungültige Zeichen (Keine Wildcards erlaubt)!");
  if (strstr($input, '..'))
    system_failure("Ungültiger Hostname");
  return $input;
}

function verify_input_hostname( $input, $wildcard=false )
{
  if (filter_input_hostname( $input, $wildcard ) != $input) {
    logger(LOG_WARNING, 'inc/security', 'verify_input_hostname', 'Ungültige Daten: '.$input);
    system_failure("Ihre Daten enthielten ungültige Zeichen!");
  }
}

function verify_input_ipv4( $input )
{
  if (! preg_match("/^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$/", $input))
    system_failure('Keine IP-Adresse');
}

function verify_input_ipv6( $input )
{
  // ripped from Perl module Net-IPv6Addr v0.2
  if (! preg_match("/^(([0-9a-f]{1,4}:){7}[0-9a-f]{1,4}|[0-9a-f]{0,4}::|:(?::[a-f0-9]{1,4}){1,6}|(?:[a-f0-9]{1,4}:){1,6}:|(?:[a-f0-9]{1,4}:)(?::[a-f0-9]{1,4}){1,6}|(?:[a-f0-9]{1,4}:){2}(?::[a-f0-9]{1,4}){1,5}|(?:[a-f0-9]{1,4}:){3}(?::[a-f0-9]{1,4}){1,4}|(?:[a-f0-9]{1,4}:){4}(?::[a-f0-9]{1,4}){1,3}|(?:[a-f0-9]{1,4}:){5}(?::[a-f0-9]{1,4}){1,2}|(?:[a-f0-9]{1,4}:){6}(?::[a-f0-9]{1,4}))$/i", $input))
    system_failure("Ungültige IPv6-Adresse");
}

function filter_quotes( $input )
{
  return preg_replace('/["\'`]/', '', $input );
}

function filter_shell( $input )
{
  return preg_replace('/[^-[:alnum:]\_\.\+ßäöüÄÖÜ/%§=]/', '', $input );
}

function verify_shell( $input )
{
  if (filter_shell($input) != $input)
    system_failure("Ihre Daten enthielten ungültige Zeichen!");
}

function check_emailaddr( $input )
{
  return (bool) filter_var($input, FILTER_VALIDATE_EMAIL) == $input;
}

function check_domain( $input )
{
  return (bool) preg_match("/[a-z0-9\.\-]+\.[a-z]{2,4}$/i", $input );
}

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