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<?php
/**
* Functions for dealing with proxies
* @package MediaWiki
*/
function wfGetForwardedFor() {
if( function_exists( 'apache_request_headers' ) ) {
// More reliable than $_SERVER due to case and -/_ folding
$set = apache_request_headers();
$index = 'X-Forwarded-For';
} else {
// Subject to spoofing with headers like X_Forwarded_For
$set = $_SERVER;
$index = 'HTTP_X_FORWARDED_FOR';
}
if( isset( $set[$index] ) ) {
return $set[$index];
} else {
return null;
}
}
/** Work out the IP address based on various globals */
function wfGetIP() {
global $wgSquidServers, $wgSquidServersNoPurge, $wgIP;
# Return cached result
if ( !empty( $wgIP ) ) {
return $wgIP;
}
/* collect the originating ips */
# Client connecting to this webserver
if ( isset( $_SERVER['REMOTE_ADDR'] ) ) {
$ipchain = array( $_SERVER['REMOTE_ADDR'] );
} else {
# Running on CLI?
$ipchain = array( '127.0.0.1' );
}
$ip = $ipchain[0];
# Get list of trusted proxies
# Flipped for quicker access
$trustedProxies = array_flip( array_merge( $wgSquidServers, $wgSquidServersNoPurge ) );
if ( count( $trustedProxies ) ) {
# 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 ) {
if ( array_key_exists( $curIP, $trustedProxies ) ) {
if ( isset( $ipchain[$i + 1] ) && wfIsIPPublic( $ipchain[$i + 1] ) ) {
$ip = $ipchain[$i + 1];
}
} else {
break;
}
}
}
wfDebug( "IP: $ip\n" );
$wgIP = $ip;
return $ip;
}
/**
* Given an IP address in dotted-quad notation, returns an unsigned integer.
* Like ip2long() except that it actually works and has a consistent error return value.
*/
function wfIP2Unsigned( $ip ) {
$n = ip2long( $ip );
if ( $n == -1 || $n === false ) { # Return value on error depends on PHP version
$n = false;
} elseif ( $n < 0 ) {
$n += pow( 2, 32 );
}
return $n;
}
/**
* Return a zero-padded hexadecimal representation of an IP address
*/
function wfIP2Hex( $ip ) {
$n = wfIP2Unsigned( $ip );
if ( $n !== false ) {
$n = sprintf( '%08X', $n );
}
return $n;
}
/**
* Determine if an IP address really is an IP address, and if it is public,
* i.e. not RFC 1918 or similar
*/
function wfIsIPPublic( $ip ) {
$n = wfIP2Unsigned( $ip );
if ( !$n ) {
return false;
}
// ip2long accepts incomplete addresses, as well as some addresses
// followed by garbage characters. Check that it's really valid.
if( $ip != long2ip( $n ) ) {
return false;
}
static $privateRanges = false;
if ( !$privateRanges ) {
$privateRanges = array(
array( '10.0.0.0', '10.255.255.255' ), # RFC 1918 (private)
array( '172.16.0.0', '172.31.255.255' ), # "
array( '192.168.0.0', '192.168.255.255' ), # "
array( '0.0.0.0', '0.255.255.255' ), # this network
array( '127.0.0.0', '127.255.255.255' ), # loopback
);
}
foreach ( $privateRanges as $r ) {
$start = wfIP2Unsigned( $r[0] );
$end = wfIP2Unsigned( $r[1] );
if ( $n >= $start && $n <= $end ) {
return false;
}
}
return true;
}
/**
* 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 $wgUseMemCached, $wgMemc, $wgDBname, $wgProxyMemcExpiry;
global $wgProxyKey;
if ( !$wgBlockOpenProxies ) {
return;
}
$ip = wfGetIP();
# Get MemCached key
$skip = false;
if ( $wgUseMemCached ) {
$mcKey = "$wgDBname:proxy:ip:$ip";
$mcValue = $wgMemc->get( $mcKey );
if ( $mcValue ) {
$skip = true;
}
}
# Fork the processes
if ( !$skip ) {
$title = Title::makeTitle( NS_SPECIAL, '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 &>/dev/null &" );
}
# Set MemCached key
if ( $wgUseMemCached ) {
$wgMemc->set( $mcKey, 1, $wgProxyMemcExpiry );
}
}
}
/**
* Convert a network specification in CIDR notation to an integer network and a number of bits
*/
function wfParseCIDR( $range ) {
$parts = explode( '/', $range, 2 );
if ( count( $parts ) != 2 ) {
return array( false, false );
}
$network = wfIP2Unsigned( $parts[0] );
if ( $network !== false && is_numeric( $parts[1] ) && $parts[1] >= 0 && $parts[1] <= 32 ) {
$bits = $parts[1];
} else {
$network = false;
$bits = false;
}
return array( $network, $bits );
}
/**
* Check if an IP address is in the local proxy list
*/
function wfIsLocallyBlockedProxy( $ip ) {
global $wgProxyList;
$fname = 'wfIsLocallyBlockedProxy';
if ( !$wgProxyList ) {
return false;
}
wfProfileIn( $fname );
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( $fname );
return $ret;
}
?>
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