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         wfDebugLog( 'img_auth', "missing PATH_INFO" );
  16         wfForbidden();
  17 }
  18
  19 # Get filenames/directories
  20 wfDebugLog( 'img_auth', "PATH_INFO is: " . $_SERVER['PATH_INFO'] );
  21 $filename = realpath( $wgUploadDirectory . $_SERVER['PATH_INFO'] );
  22 $realUploadDirectory = realpath( $wgUploadDirectory );
  23 $imageName = $wgContLang->getNsText( NS_IMAGE ) . ":" . wfBaseName( $_SERVER['PATH_INFO'] );
  24
  25 # Check if the filename is in the correct directory
  26 if ( substr( $filename, 0, strlen( $realUploadDirectory ) ) != $realUploadDirectory ) {
  27         wfDebugLog( 'img_auth', "requested path not in upload dir: $filename" );
  28         wfForbidden();
  29 }
  30
  31 if ( is_array( $wgWhitelistRead ) && !in_array( $imageName, $wgWhitelistRead ) && !$wgUser->getID() ) {
  32         wfDebugLog( 'img_auth', "not logged in and requested file not in whitelist: $imageName" );
  33         wfForbidden();
  34 }
  35
  36 if( !file_exists( $filename ) ) {
  37         wfDebugLog( 'img_auth', "requested file does not exist: $filename" );
  38         wfForbidden();
  39 }
  40 if( is_dir( $filename ) ) {
  41         wfDebugLog( 'img_auth', "requested file is a directory: $filename" );
  42         wfForbidden();
  43 }
  44
  45 # Write file
  46 wfDebugLog( 'img_auth', "streaming file: $filename" );
  47 wfStreamFile( $filename );
  48 wfLogProfilingData();
  49
  50 function wfForbidden() {
  51         header( 'HTTP/1.0 403 Forbidden' );
  52         print
  53 "<html><body>
  54 <h1>Access denied</h1>
  55 <p>You need to log in to access files on this server</p>
  56 </body></html>";
  57         wfLogProfilingData();
  58         exit;
  59 }
  60
  61 ?>