includes/ProxyTools.php

   1 <?php
   2 /**
   3  * Functions for dealing with proxies.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Extracts the XFF string from the request header
  25  * Note: headers are spoofable
  26  *
  27  * @deprecated in 1.19; use $wgRequest->getHeader( 'X-Forwarded-For' ) instead.
  28  * @return string
  29  */
  30 function wfGetForwardedFor() {
  31         wfDeprecated( __METHOD__, '1.19' );
  32         global $wgRequest;
  33         return $wgRequest->getHeader( 'X-Forwarded-For' );
  34 }
  35
  36 /**
  37  * Returns the browser/OS data from the request header
  38  * Note: headers are spoofable
  39  *
  40  * @deprecated in 1.18; use $wgRequest->getHeader( 'User-Agent' ) instead.
  41  * @return string
  42  */
  43 function wfGetAgent() {
  44         wfDeprecated( __METHOD__, '1.18' );
  45         global $wgRequest;
  46         return $wgRequest->getHeader( 'User-Agent' );
  47 }
  48
  49 /**
  50  * Work out the IP address based on various globals
  51  * For trusted proxies, use the XFF client IP (first of the chain)
  52  *
  53  * @deprecated in 1.19; call $wgRequest->getIP() directly.
  54  * @return string
  55  */
  56 function wfGetIP() {
  57         wfDeprecated( __METHOD__, '1.19' );
  58         global $wgRequest;
  59         return $wgRequest->getIP();
  60 }
  61
  62 /**
  63  * Checks if an IP is a trusted proxy providor.
  64  * Useful to tell if X-Fowarded-For data is possibly bogus.
  65  * Squid cache servers for the site are whitelisted.
  66  *
  67  * @param $ip String
  68  * @return bool
  69  */
  70 function wfIsTrustedProxy( $ip ) {
  71         $trusted = wfIsConfiguredProxy( $ip );
  72         wfRunHooks( 'IsTrustedProxy', array( &$ip, &$trusted ) );
  73         return $trusted;
  74 }
  75
  76 /**
  77  * Checks if an IP matches a proxy we've configured.
  78  * @param $ip String
  79  * @return bool
  80  */
  81 function wfIsConfiguredProxy( $ip ) {
  82         global $wgSquidServers, $wgSquidServersNoPurge;
  83         $trusted = in_array( $ip, $wgSquidServers ) ||
  84                 in_array( $ip, $wgSquidServersNoPurge );
  85         return $trusted;
  86 }
  87
  88 /**
  89  * Forks processes to scan the originating IP for an open proxy server
  90  * MemCached can be used to skip IPs that have already been scanned
  91  */
  92 function wfProxyCheck() {
  93         global $wgBlockOpenProxies, $wgProxyPorts, $wgProxyScriptPath;
  94         global $wgMemc, $wgProxyMemcExpiry, $wgRequest;
  95         global $wgProxyKey;
  96
  97         if ( !$wgBlockOpenProxies ) {
  98                 return;
  99         }
 100
 101         $ip = $wgRequest->getIP();
 102
 103         # Get MemCached key
 104         $mcKey = wfMemcKey( 'proxy', 'ip', $ip );
 105         $mcValue = $wgMemc->get( $mcKey );
 106         $skip = (bool)$mcValue;
 107
 108         # Fork the processes
 109         if ( !$skip ) {
 110                 $title = SpecialPage::getTitleFor( 'Blockme' );
 111                 $iphash = md5( $ip . $wgProxyKey );
 112                 $url = wfExpandUrl( $title->getFullURL( 'ip='.$iphash ), PROTO_HTTP );
 113
 114                 foreach ( $wgProxyPorts as $port ) {
 115                         $params = implode( ' ', array(
 116                                                 escapeshellarg( $wgProxyScriptPath ),
 117                                                 escapeshellarg( $ip ),
 118                                                 escapeshellarg( $port ),
 119                                                 escapeshellarg( $url )
 120                                                 ));
 121                         exec( "php $params >" . wfGetNull() . " 2>&1 &" );
 122                 }
 123                 # Set MemCached key
 124                 $wgMemc->set( $mcKey, 1, $wgProxyMemcExpiry );
 125         }
 126 }