220 lines
7.7 KiB
PHP
220 lines
7.7 KiB
PHP
<?php
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/**
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* Image authorisation script
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*
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* To use this, see https://www.mediawiki.org/wiki/Manual:Image_Authorization
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*
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* - Set $wgUploadDirectory to a non-public directory (not web accessible)
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* - Set $wgUploadPath to point to this file
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*
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* Optional Parameters
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*
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* - Set $wgImgAuthDetails = true if you want the reason the access was denied messages to
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* be displayed instead of just the 403 error (doesn't work on IE anyway),
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* otherwise it will only appear in error logs
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* - Set $wgImgAuthPublicTest false if you don't want to just check and see if all are public
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* must be set to false if using specific restrictions such as LockDown or NSFileRepo
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*
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* For security reasons, you usually don't want your user to know *why* access was denied,
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* just that it was. If you want to change this, you can set $wgImgAuthDetails to 'true'
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* in localsettings.php and it will give the user the reason why access was denied.
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*
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* Your server needs to support PATH_INFO; CGI-based configurations usually don't.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
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require __DIR__ . '/includes/WebStart.php';
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wfProfileIn( 'img_auth.php' );
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# Set action base paths so that WebRequest::getPathInfo()
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# recognizes the "X" as the 'title' in ../img_auth.php/X urls.
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$wgArticlePath = false; # Don't let a "/*" article path clober our action path
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$wgActionPaths = array( "$wgUploadPath/" );
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wfImageAuthMain();
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wfLogProfilingData();
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// Commit and close up!
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$factory = wfGetLBFactory();
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$factory->commitMasterChanges();
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$factory->shutdown();
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function wfImageAuthMain() {
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global $wgImgAuthPublicTest, $wgImgAuthUrlPathMap;
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$request = RequestContext::getMain()->getRequest();
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$publicWiki = in_array( 'read', User::getGroupPermissions( array( '*' ) ), true );
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// See if this is a public Wiki (no protections).
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if ( $wgImgAuthPublicTest && $publicWiki ) {
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// This is a public wiki, so disable this script (for private wikis only)
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wfForbidden( 'img-auth-accessdenied', 'img-auth-public' );
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return;
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}
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// Get the requested file path (source file or thumbnail)
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$matches = WebRequest::getPathInfo();
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if ( !isset( $matches['title'] ) ) {
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wfForbidden( 'img-auth-accessdenied', 'img-auth-nopathinfo' );
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return;
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}
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$path = $matches['title'];
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if ( $path && $path[0] !== '/' ) {
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// Make sure $path has a leading /
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$path = "/" . $path;
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}
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// Check for bug 28235: QUERY_STRING overriding the correct extension
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$whitelist = array();
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$extension = FileBackend::extensionFromPath( $path );
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if ( $extension != '' ) {
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$whitelist[] = $extension;
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}
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if ( !$request->checkUrlExtension( $whitelist ) ) {
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return;
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}
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// Various extensions may have their own backends that need access.
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// Check if there is a special backend and storage base path for this file.
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foreach ( $wgImgAuthUrlPathMap as $prefix => $storageDir ) {
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$prefix = rtrim( $prefix, '/' ) . '/'; // implicit trailing slash
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if ( strpos( $path, $prefix ) === 0 ) {
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$be = FileBackendGroup::singleton()->backendFromPath( $storageDir );
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$filename = $storageDir . substr( $path, strlen( $prefix ) ); // strip prefix
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// Check basic user authorization
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if ( !RequestContext::getMain()->getUser()->isAllowed( 'read' ) ) {
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wfForbidden( 'img-auth-accessdenied', 'img-auth-noread', $path );
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return;
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}
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if ( $be->fileExists( array( 'src' => $filename ) ) ) {
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wfDebugLog( 'img_auth', "Streaming `" . $filename . "`." );
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$be->streamFile( array( 'src' => $filename ),
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array( 'Cache-Control: private', 'Vary: Cookie' ) );
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} else {
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wfForbidden( 'img-auth-accessdenied', 'img-auth-nofile', $path );
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}
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return;
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}
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}
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// Get the local file repository
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$repo = RepoGroup::singleton()->getRepo( 'local' );
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// Get the full file storage path and extract the source file name.
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// (e.g. 120px-Foo.png => Foo.png or page2-120px-Foo.png => Foo.png).
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// This only applies to thumbnails, and all thumbnails should
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// be under a folder that has the source file name.
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if ( strpos( $path, '/thumb/' ) === 0 ) {
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$name = wfBaseName( dirname( $path ) ); // file is a thumbnail
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$filename = $repo->getZonePath( 'thumb' ) . substr( $path, 6 ); // strip "/thumb"
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// Check to see if the file exists
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if ( !$repo->fileExists( $filename ) ) {
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wfForbidden( 'img-auth-accessdenied', 'img-auth-nofile', $filename );
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return;
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}
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} else {
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$name = wfBaseName( $path ); // file is a source file
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$filename = $repo->getZonePath( 'public' ) . $path;
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// Check to see if the file exists and is not deleted
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$bits = explode( '!', $name, 2 );
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if ( substr( $path, 0, 9 ) === '/archive/' && count( $bits ) == 2 ) {
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$file = $repo->newFromArchiveName( $bits[1], $name );
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} else {
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$file = $repo->newFile( $name );
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}
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if ( !$file->exists() || $file->isDeleted( File::DELETED_FILE ) ) {
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wfForbidden( 'img-auth-accessdenied', 'img-auth-nofile', $filename );
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return;
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}
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}
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$headers = array(); // extra HTTP headers to send
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if ( !$publicWiki ) {
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// For private wikis, run extra auth checks and set cache control headers
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$headers[] = 'Cache-Control: private';
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$headers[] = 'Vary: Cookie';
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$title = Title::makeTitleSafe( NS_FILE, $name );
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if ( !$title instanceof Title ) { // files have valid titles
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wfForbidden( 'img-auth-accessdenied', 'img-auth-badtitle', $name );
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return;
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}
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// Run hook for extension authorization plugins
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/** @var $result array */
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$result = null;
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if ( !wfRunHooks( 'ImgAuthBeforeStream', array( &$title, &$path, &$name, &$result ) ) ) {
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wfForbidden( $result[0], $result[1], array_slice( $result, 2 ) );
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return;
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}
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// Check user authorization for this title
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// Checks Whitelist too
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if ( !$title->userCan( 'read' ) ) {
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wfForbidden( 'img-auth-accessdenied', 'img-auth-noread', $name );
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return;
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}
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}
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if ( $request->getCheck( 'download' ) ) {
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$headers[] = 'Content-Disposition: attachment';
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}
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// Stream the requested file
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wfDebugLog( 'img_auth', "Streaming `" . $filename . "`." );
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$repo->streamFile( $filename, $headers );
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}
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/**
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* Issue a standard HTTP 403 Forbidden header ($msg1-a message index, not a message) and an
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* error message ($msg2, also a message index), (both required) then end the script
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* subsequent arguments to $msg2 will be passed as parameters only for replacing in $msg2
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* @param string $msg1
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* @param string $msg2
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*/
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function wfForbidden( $msg1, $msg2 ) {
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global $wgImgAuthDetails;
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$args = func_get_args();
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array_shift( $args );
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array_shift( $args );
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$args = ( isset( $args[0] ) && is_array( $args[0] ) ) ? $args[0] : $args;
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$msgHdr = wfMessage( $msg1 )->escaped();
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$detailMsgKey = $wgImgAuthDetails ? $msg2 : 'badaccess-group0';
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$detailMsg = wfMessage( $detailMsgKey, $args )->escaped();
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wfDebugLog( 'img_auth',
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"wfForbidden Hdr: " . wfMessage( $msg1 )->inLanguage( 'en' )->text() . " Msg: " .
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wfMessage( $msg2, $args )->inLanguage( 'en' )->text()
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);
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header( 'HTTP/1.0 403 Forbidden' );
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header( 'Cache-Control: no-cache' );
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header( 'Content-Type: text/html; charset=utf-8' );
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echo <<<ENDS
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<html>
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<body>
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<h1>$msgHdr</h1>
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<p>$detailMsg</p>
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</body>
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</html>
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ENDS;
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}
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