4 * Image authorisation script
6 * To use this, see http://www.mediawiki.org/wiki/Manual:Image_Authorization
8 * - Set $wgUploadDirectory to a non-public directory (not web accessible)
9 * - Set $wgUploadPath to point to this file
13 * - Set $wgImgAuthDetails = true if you want the reason the access was denied messages to be displayed
14 * instead of just the 403 error (doesn't work on IE anyway), otherwise will only appear in error logs
15 * - Set $wgImgAuthPublicTest false if you don't want to just check and see if all are public
16 * must be set to false if using specific restrictions such as LockDown or NSFileRepo
18 * For security reasons, you usually don't want your user to know *why* access was denied, just that it was.
19 * If you want to change this, you can set $wgImgAuthDetails to 'true' in localsettings.php and it will give the user the reason
20 * why access was denied.
22 * Your server needs to support PATH_INFO; CGI-based configurations usually don't.
28 define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
29 require_once( dirname( __FILE__
) . '/includes/WebStart.php' );
30 wfProfileIn( 'img_auth.php' );
31 require_once( dirname( __FILE__
) . '/includes/StreamFile.php' );
33 // See if this is a public Wiki (no protections)
34 if ( $wgImgAuthPublicTest
35 && in_array( 'read', User
::getGroupPermissions( array( '*' ) ), true ) )
37 wfForbidden('img-auth-accessdenied','img-auth-public');
40 // Extract path and image information
41 if( !isset( $_SERVER['PATH_INFO'] ) )
42 wfForbidden('img-auth-accessdenied','img-auth-nopathinfo');
44 $path = $_SERVER['PATH_INFO'];
45 $filename = realpath( $wgUploadDirectory . $_SERVER['PATH_INFO'] );
46 $realUpload = realpath( $wgUploadDirectory );
48 // Basic directory traversal check
49 if( substr( $filename, 0, strlen( $realUpload ) ) != $realUpload )
50 wfForbidden('img-auth-accessdenied','img-auth-notindir');
52 // Extract the file name and chop off the size specifier
53 // (e.g. 120px-Foo.png => Foo.png)
54 $name = wfBaseName( $path );
55 if( preg_match( '!\d+px-(.*)!i', $name, $m ) )
58 // Check to see if the file exists
59 if( !file_exists( $filename ) )
60 wfForbidden('img-auth-accessdenied','img-auth-nofile',$filename);
62 // Check to see if tried to access a directory
63 if( is_dir( $filename ) )
64 wfForbidden('img-auth-accessdenied','img-auth-isdir',$filename);
67 $title = Title
::makeTitleSafe( NS_FILE
, $name );
69 // See if could create the title object
70 if( !$title instanceof Title
)
71 wfForbidden('img-auth-accessdenied','img-auth-badtitle',$name);
74 if (!wfRunHooks( 'ImgAuthBeforeStream', array( &$title, &$path, &$name, &$result ) ) )
75 wfForbidden($result[0],$result[1],array_slice($result,2));
77 // Check user authorization for this title
78 // UserCanRead Checks Whitelist too
79 if( !$title->userCanRead() )
80 wfForbidden('img-auth-accessdenied','img-auth-noread',$name);
82 // Stream the requested file
83 wfDebugLog( 'img_auth', "Streaming `".$filename."`." );
84 wfStreamFile( $filename, array( 'Cache-Control: private', 'Vary: Cookie' ) );
88 * Issue a standard HTTP 403 Forbidden header ($msg1-a message index, not a message) and an
89 * error message ($msg2, also a message index), (both required) then end the script
90 * subsequent arguments to $msg2 will be passed as parameters only for replacing in $msg2
92 function wfForbidden($msg1,$msg2) {
93 global $wgImgAuthDetails;
94 $args = func_get_args();
97 $MsgHdr = htmlspecialchars(wfMsg($msg1));
98 $detailMsg = (htmlspecialchars(wfMsg(($wgImgAuthDetails ?
$msg2 : 'badaccess-group0'),$args)));
99 wfDebugLog('img_auth', "wfForbidden Hdr:".wfMsgExt( $msg1, array('language' => 'en'))." Msg: ".
100 wfMsgExt($msg2,array('language' => 'en'),$args));
101 header( 'HTTP/1.0 403 Forbidden' );
102 header( 'Cache-Control: no-cache' );
103 header( 'Content-Type: text/html; charset=utf-8' );
112 wfLogProfilingData();