$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; }