<?php
/**
* Functions for dealing with proxies
- * @package MediaWiki
+ * @file
*/
-if ( !defined( 'MEDIAWIKI' ) ) {
- die();
+/**
+ * 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;
+ }
}
-/** Work out the IP address based on various globals */
+/**
+ * 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 $wgSquidServers, $wgSquidServersNoPurge;
+ global $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'] );
+ $ipchain = array( IP::canonicalize( $_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
- if ( isset( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {
- $xff = array_map( 'trim', explode( ',', $_SERVER['HTTP_X_FORWARDED_FOR'] ) );
- $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;
+ # 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] ) && IP::isPublic( $ipchain[$i + 1] ) ) {
+ $ip = $ipchain[$i + 1];
}
+ } else {
+ break;
}
}
+ wfDebug( "IP: $ip\n" );
+ $wgIP = $ip;
return $ip;
}
-/** */
-function wfIP2Unsigned( $ip ) {
- $n = ip2long( $ip );
- if ( $n == -1 ) {
- $n = false;
- } elseif ( $n < 0 ) {
- $n += pow( 2, 32 );
+/**
+ * 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 string $ip
+ * @return bool
+ */
+function wfIsTrustedProxy( $ip ) {
+ global $wgSquidServers, $wgSquidServersNoPurge;
+
+ if ( in_array( $ip, $wgSquidServers ) ||
+ in_array( $ip, $wgSquidServersNoPurge ) ||
+ wfIsAOLProxy( $ip )
+ ) {
+ $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;
}
- return $n;
+
+ $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 &>/dev/null &" );
+ }
+ # 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 );
}
/**
- * Determine if an IP address really is an IP address, and if it is public,
- * i.e. not RFC 1918 or similar
+ * Check if an IP address is in the local proxy list
+ * @return bool
*/
-function wfIsIPPublic( $ip ) {
- $n = wfIP2Unsigned( $ip );
- if ( !$n ) {
+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;
+}
- 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
- );
+/**
+ * TODO: move this list to the database in a global IP info table incorporating
+ * trusted ISP proxies, blocked IP addresses and open proxies.
+ * @return bool
+ */
+function wfIsAOLProxy( $ip ) {
+ $ranges = array(
+ '64.12.96.0/19',
+ '149.174.160.0/20',
+ '152.163.240.0/21',
+ '152.163.248.0/22',
+ '152.163.252.0/23',
+ '152.163.96.0/22',
+ '152.163.100.0/23',
+ '195.93.32.0/22',
+ '195.93.48.0/22',
+ '195.93.64.0/19',
+ '195.93.96.0/19',
+ '195.93.16.0/20',
+ '198.81.0.0/22',
+ '198.81.16.0/20',
+ '198.81.8.0/23',
+ '202.67.64.128/25',
+ '205.188.192.0/20',
+ '205.188.208.0/23',
+ '205.188.112.0/20',
+ '205.188.146.144/30',
+ '207.200.112.0/21',
+ );
+
+ static $parsedRanges;
+ if ( is_null( $parsedRanges ) ) {
+ $parsedRanges = array();
+ foreach ( $ranges as $range ) {
+ $parsedRanges[] = IP::parseRange( $range );
+ }
}
- foreach ( $privateRanges as $r ) {
- $start = wfIP2Unsigned( $r[0] );
- $end = wfIP2Unsigned( $r[1] );
- if ( $n >= $start && $n <= $end ) {
- return false;
+ $hex = IP::toHex( $ip );
+ foreach ( $parsedRanges as $range ) {
+ if ( $hex >= $range[0] && $hex <= $range[1] ) {
+ return true;
}
}
- return true;
+ return false;
}
-
-?>
dépôts / lhc / web / wiklou.git / blobdiff