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<?php
/**
* Image authorisation script
*
* To use this, see http://www.mediawiki.org/wiki/Manual:Image_Authorization
*
* - Set $wgUploadDirectory to a non-public directory (not web accessible)
* - Set $wgUploadPath to point to this file
*
* Optional Parameters
*
* - Set $wgImgAuthDetails = true if you want the reason the access was denied messages to be displayed
* instead of just the 403 error (doesn't work on IE anyway), otherwise will only appear in error logs
* - Set $wgImgAuthPublicTest false if you don't want to just check and see if all are public
* must be set to false if using specific restrictions such as LockDown or NSFileRepo
*
* For security reasons, you usually don't want your user to know *why* access was denied, just that it was.
* If you want to change this, you can set $wgImgAuthDetails to 'true' in localsettings.php and it will give the user the reason
* why access was denied.
*
* Your server needs to support PATH_INFO; CGI-based configurations usually don't.
*
* @file
*
**/
define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
require_once( dirname( __FILE__ ) . '/includes/WebStart.php' );
wfProfileIn( 'img_auth.php' );
require_once( dirname( __FILE__ ) . '/includes/StreamFile.php' );
// See if this is a public Wiki (no protections)
if ( $wgImgAuthPublicTest
&& in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) )
{
wfForbidden('img-auth-accessdenied','img-auth-public');
}
// Extract path and image information
if( !isset( $_SERVER['PATH_INFO'] ) )
wfForbidden('img-auth-accessdenied','img-auth-nopathinfo');
$path = $_SERVER['PATH_INFO'];
$filename = realpath( $wgUploadDirectory . $_SERVER['PATH_INFO'] );
$realUpload = realpath( $wgUploadDirectory );
// Basic directory traversal check
if( substr( $filename, 0, strlen( $realUpload ) ) != $realUpload )
wfForbidden('img-auth-accessdenied','img-auth-notindir');
// Extract the file name and chop off the size specifier
// (e.g. 120px-Foo.png => Foo.png)
$name = wfBaseName( $path );
if( preg_match( '!\d+px-(.*)!i', $name, $m ) )
$name = $m[1];
// Check to see if the file exists
if( !file_exists( $filename ) )
wfForbidden('img-auth-accessdenied','img-auth-nofile',$filename);
// Check to see if tried to access a directory
if( is_dir( $filename ) )
wfForbidden('img-auth-accessdenied','img-auth-isdir',$filename);
$title = Title::makeTitleSafe( NS_FILE, $name );
// See if could create the title object
if( !$title instanceof Title )
wfForbidden('img-auth-accessdenied','img-auth-badtitle',$name);
// Run hook
if (!wfRunHooks( 'ImgAuthBeforeStream', array( &$title, &$path, &$name, &$result ) ) )
wfForbidden($result[0],$result[1],array_slice($result,2));
// Check user authorization for this title
// UserCanRead Checks Whitelist too
if( !$title->userCanRead() )
wfForbidden('img-auth-accessdenied','img-auth-noread',$name);
// Stream the requested file
wfDebugLog( 'img_auth', "Streaming `".$filename."`." );
wfStreamFile( $filename, array( 'Cache-Control: private', 'Vary: Cookie' ) );
wfLogProfilingData();
/**
* Issue a standard HTTP 403 Forbidden header ($msg1-a message index, not a message) and an
* error message ($msg2, also a message index), (both required) then end the script
* subsequent arguments to $msg2 will be passed as parameters only for replacing in $msg2
*/
function wfForbidden($msg1,$msg2) {
global $wgImgAuthDetails;
$args = func_get_args();
array_shift( $args );
array_shift( $args );
$MsgHdr = htmlspecialchars(wfMsg($msg1));
$detailMsg = (htmlspecialchars(wfMsg(($wgImgAuthDetails ? $msg2 : 'badaccess-group0'),$args)));
wfDebugLog('img_auth', "wfForbidden Hdr:".wfMsgExt( $msg1, array('language' => 'en'))." Msg: ".
wfMsgExt($msg2,array('language' => 'en'),$args));
header( 'HTTP/1.0 403 Forbidden' );
header( 'Cache-Control: no-cache' );
header( 'Content-Type: text/html; charset=utf-8' );
echo <<<ENDS
<html>
<body>
<h1>$MsgHdr</h1>
<p>$detailMsg</p>
</body>
</html>
ENDS;
wfLogProfilingData();
exit();
}
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