includes/ProxyTools.php

   1 <?php
   2 /**
   3  * Functions for dealing with proxies
   4  *
   5  * @file
   6  */
   7
   8 /**
   9  * Extracts the XFF string from the request header
  10  * Note: headers are spoofable
  11  *
  12  * @deprecated in 1.19; use $wgRequest->getHeader( 'X-Forwarded-For' ) instead.
  13  * @return string
  14  */
  15 function wfGetForwardedFor() {
  16         global $wgRequest;
  17         return $wgRequest->getHeader( 'X-Forwarded-For' );
  18 }
  19
  20 /**
  21  * Returns the browser/OS data from the request header
  22  * Note: headers are spoofable
  23  *
  24  * @deprecated in 1.18; use $wgRequest->getHeader( 'User-Agent' ) instead.
  25  * @return string
  26  */
  27 function wfGetAgent() {
  28         wfDeprecated( __FUNCTION__ );
  29         global $wgRequest;
  30         return $wgRequest->getHeader( 'User-Agent' );
  31 }
  32
  33 /**
  34  * Work out the IP address based on various globals
  35  * For trusted proxies, use the XFF client IP (first of the chain)
  36  *
  37  * @deprecated in 1.19; call $wgRequest->getIP() directly.
  38  * @return string
  39  */
  40 function wfGetIP() {
  41         global $wgRequest;
  42         return $wgRequest->getIP();
  43 }
  44
  45 /**
  46  * Checks if an IP is a trusted proxy providor
  47  * Useful to tell if X-Fowarded-For data is possibly bogus
  48  * Squid cache servers for the site and AOL are whitelisted
  49  * @param $ip String
  50  * @return bool
  51  */
  52 function wfIsTrustedProxy( $ip ) {
  53         global $wgSquidServers, $wgSquidServersNoPurge;
  54
  55         $trusted = in_array( $ip, $wgSquidServers ) ||
  56                 in_array( $ip, $wgSquidServersNoPurge );
  57         wfRunHooks( 'IsTrustedProxy', array( &$ip, &$trusted ) );
  58         return $trusted;
  59 }
  60
  61 /**
  62  * Forks processes to scan the originating IP for an open proxy server
  63  * MemCached can be used to skip IPs that have already been scanned
  64  */
  65 function wfProxyCheck() {
  66         global $wgBlockOpenProxies, $wgProxyPorts, $wgProxyScriptPath;
  67         global $wgMemc, $wgProxyMemcExpiry, $wgRequest;
  68         global $wgProxyKey;
  69
  70         if ( !$wgBlockOpenProxies ) {
  71                 return;
  72         }
  73
  74         $ip = $wgRequest->getIP();
  75
  76         # Get MemCached key
  77         $mcKey = wfMemcKey( 'proxy', 'ip', $ip );
  78         $mcValue = $wgMemc->get( $mcKey );
  79         $skip = (bool)$mcValue;
  80
  81         # Fork the processes
  82         if ( !$skip ) {
  83                 $title = SpecialPage::getTitleFor( 'Blockme' );
  84                 $iphash = md5( $ip . $wgProxyKey );
  85                 $url = $title->getFullURL( 'ip='.$iphash );
  86
  87                 foreach ( $wgProxyPorts as $port ) {
  88                         $params = implode( ' ', array(
  89                                                 escapeshellarg( $wgProxyScriptPath ),
  90                                                 escapeshellarg( $ip ),
  91                                                 escapeshellarg( $port ),
  92                                                 escapeshellarg( $url )
  93                                                 ));
  94                         exec( "php $params >" . wfGetNull() . " 2>&1 &" );
  95                 }
  96                 # Set MemCached key
  97                 $wgMemc->set( $mcKey, 1, $wgProxyMemcExpiry );
  98         }
  99 }