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 require_once( './includes/WebStart.php' );
  11 wfProfileIn( 'img_auth.php' );
  12 require_once( './includes/StreamFile.php' );
  13
  14 if( !isset( $_SERVER['PATH_INFO'] ) ) {
  15         wfForbidden();
  16 }
  17
  18 # Get filenames/directories
  19 $filename = realpath( $wgUploadDirectory . $_SERVER['PATH_INFO'] );
  20 $realUploadDirectory = realpath( $wgUploadDirectory );
  21 $imageName = $wgContLang->getNsText( NS_IMAGE ) . ":" . wfBaseName( $_SERVER['PATH_INFO'] );
  22
  23 # Check if the filename is in the correct directory
  24 if ( substr( $filename, 0, strlen( $realUploadDirectory ) ) != $realUploadDirectory ) {
  25         wfForbidden();
  26 }
  27
  28 if ( is_array( $wgWhitelistRead ) && !in_array( $imageName, $wgWhitelistRead ) && !$wgUser->getID() ) {
  29         wfForbidden();
  30 }
  31
  32 if( !file_exists( $filename ) ) {
  33         wfForbidden();
  34 }
  35 if( is_dir( $filename ) ) {
  36         wfForbidden();
  37 }
  38
  39 # Write file
  40 wfStreamFile( $filename );
  41 wfLogProfilingData();
  42
  43 function wfForbidden() {
  44         header( 'HTTP/1.0 403 Forbidden' );
  45         print
  46 "<html><body>
  47 <h1>Access denied</h1>
  48 <p>You need to log in to access files on this server</p>
  49 </body></html>";
  50         wfLogProfilingData();
  51         exit;
  52 }
  53
  54 ?>