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<?php
/**
* Functions for dealing with proxies.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* Extracts the XFF string from the request header
* Note: headers are spoofable
*
* @deprecated in 1.19; use $wgRequest->getHeader( 'X-Forwarded-For' ) instead.
* @return string
*/
function wfGetForwardedFor() {
wfDeprecated( __METHOD__, '1.19' );
global $wgRequest;
return $wgRequest->getHeader( 'X-Forwarded-For' );
}
/**
* Returns the browser/OS data from the request header
* Note: headers are spoofable
*
* @deprecated in 1.18; use $wgRequest->getHeader( 'User-Agent' ) instead.
* @return string
*/
function wfGetAgent() {
wfDeprecated( __METHOD__, '1.18' );
global $wgRequest;
return $wgRequest->getHeader( 'User-Agent' );
}
/**
* Work out the IP address based on various globals
* For trusted proxies, use the XFF client IP (first of the chain)
*
* @deprecated in 1.19; call $wgRequest->getIP() directly.
* @return string
*/
function wfGetIP() {
wfDeprecated( __METHOD__, '1.19' );
global $wgRequest;
return $wgRequest->getIP();
}
/**
* Checks if an IP is a trusted proxy provider.
* Useful to tell if X-Forwarded-For data is possibly bogus.
* Squid cache servers for the site are whitelisted.
*
* @param $ip String
* @return bool
*/
function wfIsTrustedProxy( $ip ) {
$trusted = wfIsConfiguredProxy( $ip );
wfRunHooks( 'IsTrustedProxy', array( &$ip, &$trusted ) );
return $trusted;
}
/**
* Checks if an IP matches a proxy we've configured.
* @param $ip String
* @return bool
*/
function wfIsConfiguredProxy( $ip ) {
global $wgSquidServers, $wgSquidServersNoPurge;
$trusted = in_array( $ip, $wgSquidServers ) ||
in_array( $ip, $wgSquidServersNoPurge );
return $trusted;
}
/**
* Forks processes to scan the originating IP for an open proxy server
* MemCached can be used to skip IPs that have already been scanned
*/
function wfProxyCheck() {
global $wgBlockOpenProxies, $wgProxyPorts, $wgProxyScriptPath;
global $wgMemc, $wgProxyMemcExpiry, $wgRequest;
global $wgProxyKey;
if ( !$wgBlockOpenProxies ) {
return;
}
$ip = $wgRequest->getIP();
# Get MemCached key
$mcKey = wfMemcKey( 'proxy', 'ip', $ip );
$mcValue = $wgMemc->get( $mcKey );
$skip = (bool)$mcValue;
# Fork the processes
if ( !$skip ) {
$title = SpecialPage::getTitleFor( 'Blockme' );
$iphash = md5( $ip . $wgProxyKey );
$url = wfExpandUrl( $title->getFullURL( 'ip=' . $iphash ), PROTO_HTTP );
foreach ( $wgProxyPorts as $port ) {
$params = implode( ' ', array(
escapeshellarg( $wgProxyScriptPath ),
escapeshellarg( $ip ),
escapeshellarg( $port ),
escapeshellarg( $url )
));
exec( "php $params >" . wfGetNull() . " 2>&1 &" );
}
# Set MemCached key
$wgMemc->set( $mcKey, 1, $wgProxyMemcExpiry );
}
}
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