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img_auth.php
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img_auth.php
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<?php
/**
* Image authorisation script
*
* To use this:
*
* Set $wgUploadDirectory to a non-public directory (not web accessible)
* Set $wgUploadPath to point to this file
*
* Your server needs to support PATH_INFO; CGI-based configurations
* usually don't.
*/
define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
require_once( dirname( __FILE__ ) . '/includes/WebStart.php' );
wfProfileIn( 'img_auth.php' );
require_once( dirname( __FILE__ ) . '/includes/StreamFile.php' );
// Extract path and image information
if( !isset( $_SERVER['PATH_INFO'] ) ) {
wfDebugLog( 'img_auth', 'Missing PATH_INFO' );
wfForbidden();
}
$path = $_SERVER['PATH_INFO'];
$filename = realpath( $wgUploadDirectory . $_SERVER['PATH_INFO'] );
$realUpload = realpath( $wgUploadDirectory );
wfDebugLog( 'img_auth', "\$path is {$path}" );
wfDebugLog( 'img_auth', "\$filename is {$filename}" );
// Basic directory traversal check
if( substr( $filename, 0, strlen( $realUpload ) ) != $realUpload ) {
wfDebugLog( 'img_auth', 'Requested path not in upload directory' );
wfForbidden();
}
// 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 = $m[1];
wfDebugLog( 'img_auth', "\$name is {$name}" );
$title = Title::makeTitleSafe( NS_IMAGE, $name );
if( !$title instanceof Title ) {
wfDebugLog( 'img_auth', "Unable to construct a valid Title from `{$name}`" );
wfForbidden();
}
$title = $title->getPrefixedText();
// Check the whitelist if needed
if( !$wgUser->getId() && ( !is_array( $wgWhitelistRead ) || !in_array( $title, $wgWhitelistRead ) ) ) {
wfDebugLog( 'img_auth', "Not logged in and `{$title}` not in whitelist." );
wfForbidden();
}
if( !file_exists( $filename ) ) {
wfDebugLog( 'img_auth', "`{$filename}` does not exist" );
wfForbidden();
}
if( is_dir( $filename ) ) {
wfDebugLog( 'img_auth', "`{$filename}` is a directory" );
wfForbidden();
}
// 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 and a basic
* error message, then end the script
*/
function wfForbidden() {
header( 'HTTP/1.0 403 Forbidden' );
header( 'Vary: Cookie' );
header( 'Content-Type: text/html; charset=utf-8' );
echo <<<ENDS
<html>
<body>
<h1>Access Denied</h1>
<p>You need to log in to access files on this server.</p>
</body>
</html>
ENDS;
wfLogProfilingData();
exit();
}