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authorPierre Schmitz <pierre@archlinux.de>2006-10-11 18:12:39 +0000
committerPierre Schmitz <pierre@archlinux.de>2006-10-11 18:12:39 +0000
commit183851b06bd6c52f3cae5375f433da720d410447 (patch)
treea477257decbf3360127f6739c2f9d0ec57a03d39 /includes/ProxyTools.php
MediaWiki 1.7.1 wiederhergestellt
Diffstat (limited to 'includes/ProxyTools.php')
-rw-r--r--includes/ProxyTools.php233
1 files changed, 233 insertions, 0 deletions
diff --git a/includes/ProxyTools.php b/includes/ProxyTools.php
new file mode 100644
index 00000000..bed79c10
--- /dev/null
+++ b/includes/ProxyTools.php
@@ -0,0 +1,233 @@
+<?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;
+}
+
+
+
+
+?>