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<?php
/**
* Functions for dealing with proxies
* @file
*/
/**
* Extracts the XFF string from the request header
* Checks first for "X-Forwarded-For", then "Client-ip"
* Note: headers are spoofable
* @return string
*/
function wfGetForwardedFor() {
if( function_exists( 'apache_request_headers' ) ) {
// More reliable than $_SERVER due to case and -/_ folding
$set = array ();
foreach ( apache_request_headers() as $tempName => $tempValue ) {
$set[ strtoupper( $tempName ) ] = $tempValue;
}
$index = strtoupper ( 'X-Forwarded-For' );
$index2 = strtoupper ( 'Client-ip' );
} else {
// Subject to spoofing with headers like X_Forwarded_For
$set = $_SERVER;
$index = 'HTTP_X_FORWARDED_FOR';
$index2 = 'CLIENT-IP';
}
#Try a couple of headers
if( isset( $set[$index] ) ) {
return $set[$index];
} else if( isset( $set[$index2] ) ) {
return $set[$index2];
} else {
return null;
}
}
/**
* Returns the browser/OS data from the request header
* Note: headers are spoofable
* @return string
*/
function wfGetAgent() {
if( function_exists( 'apache_request_headers' ) ) {
// More reliable than $_SERVER due to case and -/_ folding
$set = array ();
foreach ( apache_request_headers() as $tempName => $tempValue ) {
$set[ strtoupper( $tempName ) ] = $tempValue;
}
$index = strtoupper ( 'User-Agent' );
} else {
// Subject to spoofing with headers like X_Forwarded_For
$set = $_SERVER;
$index = 'HTTP_USER_AGENT';
}
if( isset( $set[$index] ) ) {
return $set[$index];
} else {
return '';
}
}
/**
* Work out the IP address based on various globals
* For trusted proxies, use the XFF client IP (first of the chain)
* @return string
*/
function wfGetIP() {
global $wgIP, $wgUsePrivateIPs, $wgCommandLineMode;
# Return cached result
if ( !empty( $wgIP ) ) {
return $wgIP;
}
$ipchain = array();
$ip = false;
/* collect the originating ips */
# Client connecting to this webserver
if ( isset( $_SERVER['REMOTE_ADDR'] ) ) {
$ip = IP::canonicalize( $_SERVER['REMOTE_ADDR'] );
} elseif( $wgCommandLineMode ) {
$ip = '127.0.0.1';
}
if( $ip ) {
$ipchain[] = $ip;
}
# Append XFF on to $ipchain
$forwardedFor = wfGetForwardedFor();
if ( isset( $forwardedFor ) ) {
$xff = array_map( 'trim', explode( ',', $forwardedFor ) );
$xff = array_reverse( $xff );
$ipchain = array_merge( $ipchain, $xff );
}
# Step through XFF list and find the last address in the list which is a trusted server
# Set $ip to the IP address given by that trusted server, unless the address is not sensible (e.g. private)
foreach ( $ipchain as $i => $curIP ) {
$curIP = IP::canonicalize( $curIP );
if ( wfIsTrustedProxy( $curIP ) ) {
if ( isset( $ipchain[$i + 1] ) ) {
if( $wgUsePrivateIPs || IP::isPublic( $ipchain[$i + 1 ] ) ) {
$ip = $ipchain[$i + 1];
}
}
} else {
break;
}
}
if( !$ip ) {
throw new MWException( "Unable to determine IP" );
}
wfDebug( "IP: $ip\n" );
$wgIP = $ip;
return $ip;
}
/**
* Checks if an IP is a trusted proxy providor
* Useful to tell if X-Fowarded-For data is possibly bogus
* Squid cache servers for the site and AOL are whitelisted
* @param $ip String
* @return bool
*/
function wfIsTrustedProxy( $ip ) {
global $wgSquidServers, $wgSquidServersNoPurge;
if ( in_array( $ip, $wgSquidServers ) ||
in_array( $ip, $wgSquidServersNoPurge )
) {
$trusted = true;
} else {
$trusted = false;
}
wfRunHooks( 'IsTrustedProxy', array( &$ip, &$trusted ) );
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;
global $wgProxyKey;
if ( !$wgBlockOpenProxies ) {
return;
}
$ip = wfGetIP();
# 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 = $title->getFullURL( 'ip='.$iphash );
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 );
}
}
/**
* Convert a network specification in CIDR notation to an integer network and a number of bits
* @return array(string, int)
*/
function wfParseCIDR( $range ) {
return IP::parseCIDR( $range );
}
/**
* Check if an IP address is in the local proxy list
* @return bool
*/
function wfIsLocallyBlockedProxy( $ip ) {
global $wgProxyList;
if ( !$wgProxyList ) {
return false;
}
wfProfileIn( __METHOD__ );
if ( !is_array( $wgProxyList ) ) {
# Load from the specified file
$wgProxyList = array_map( 'trim', file( $wgProxyList ) );
}
if ( !is_array( $wgProxyList ) ) {
$ret = false;
} elseif ( array_search( $ip, $wgProxyList ) !== false ) {
$ret = true;
} elseif ( array_key_exists( $ip, $wgProxyList ) ) {
# Old-style flipped proxy list
$ret = true;
} else {
$ret = false;
}
wfProfileOut( __METHOD__ );
return $ret;
}
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