img_auth.php

   1 <?php
   2 /**
   3  * Image download authorisation script
   4  *
   5  * To use, in LocalSettings.php set $wgUploadDirectory to point to a non-public
   6  * directory, and $wgUploadPath to point to this file. Also set $wgWhitelistRead
   7  * to an array of pages you want everyone to be able to access. Your server must
   8  * support PATH_INFO, CGI-based configurations generally don't.
   9  */
  10 # Valid web server entry point, enable includes
  11 define( 'MEDIAWIKI', true );
  12
  13 require_once( 'includes/Defines.php' );
  14 require_once( './LocalSettings.php' );
  15 require_once( 'includes/Setup.php' );
  16 require_once( 'includes/StreamFile.php' );
  17
  18 if( !isset( $_SERVER['PATH_INFO'] ) ) {
  19         wfForbidden();
  20 }
  21
  22 # Get filenames/directories
  23 $filename = realpath( $wgUploadDirectory . $_SERVER['PATH_INFO'] );
  24 $realUploadDirectory = realpath( $wgUploadDirectory );
  25 $imageName = $wgLang->getNsText( NS_IMAGE ) . ":" . basename( $_SERVER['PATH_INFO'] );
  26
  27 # Check if the filename is in the correct directory
  28 if ( substr( $filename, 0, strlen( $realUploadDirectory ) ) != $realUploadDirectory ) {
  29         wfForbidden();
  30 }
  31
  32 if ( is_array( $wgWhitelistRead ) && !in_array( $imageName, $wgWhitelistRead ) && !$wgUser->getID() ) {
  33         wfForbidden();
  34 }
  35
  36 if( !file_exists( $filename ) ) {
  37         wfForbidden();
  38 }
  39 if( is_dir( $filename ) ) {
  40         wfForbidden();
  41 }
  42
  43 # Write file
  44 wfStreamFile( $filename );
  45
  46 function wfForbidden() {
  47         header( 'HTTP/1.0 403 Forbidden' );
  48         print
  49 "<html><body>
  50 <h1>Access denied</h1>
  51 <p>You need to log in to access files on this server</p>
  52 </body></html>";
  53         exit;
  54 }
  55
  56 ?>