786e87c75c
Do not pass arbitrary parameters to the generic message whose purpose is to hide details; parameters can be revealed with uselang=qqx. Change-Id: I6e239bc91db9089aea36e91908fe50b5a5a429d8 (cherry picked from commit c5a62853cc2ebc85cbcfcc932f78bc87657a5dc1)
235 lines
8.1 KiB
PHP
235 lines
8.1 KiB
PHP
<?php
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/**
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* Entry point implementation for serving non-public images to logged-in users.
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*
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* @see /img_auth.php The web entry point.
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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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* @ingroup entrypoint
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*/
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namespace MediaWiki\FileRepo;
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use File;
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use MediaWiki\HookContainer\HookRunner;
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use MediaWiki\Html\TemplateParser;
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use MediaWiki\MainConfigNames;
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use MediaWiki\MediaWikiEntryPoint;
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use MediaWiki\Title\Title;
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use Wikimedia\FileBackend\HTTPFileStreamer;
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class AuthenticatedFileEntryPoint extends MediaWikiEntryPoint {
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/**
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* Main entry point
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*/
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public function execute() {
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$services = $this->getServiceContainer();
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$permissionManager = $services->getPermissionManager();
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$request = $this->getRequest();
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$publicWiki = $services->getGroupPermissionsLookup()->groupHasPermission( '*', 'read' );
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// Find the path assuming the request URL is relative to the local public zone URL
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$baseUrl = $services->getRepoGroup()->getLocalRepo()->getZoneUrl( 'public' );
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if ( $baseUrl[0] === '/' ) {
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$basePath = $baseUrl;
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} else {
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$basePath = parse_url( $baseUrl, PHP_URL_PATH );
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}
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$path = $this->getRequestPathSuffix( "$basePath" );
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if ( $path === false ) {
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// Try instead assuming img_auth.php is the base path
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$basePath = $this->getConfig( MainConfigNames::ImgAuthPath )
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?: $this->getConfig( MainConfigNames::ScriptPath ) . '/img_auth.php';
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$path = $this->getRequestPathSuffix( $basePath );
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}
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if ( $path === false ) {
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$this->forbidden( 'img-auth-accessdenied', 'img-auth-notindir' );
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return;
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}
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if ( $path === '' || $path[0] !== '/' ) {
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// Make sure $path has a leading /
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$path = "/" . $path;
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}
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$user = $this->getContext()->getUser();
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// Various extensions may have their own backends that need access.
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// Check if there is a special backend and storage base path for this file.
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$pathMap = $this->getConfig( MainConfigNames::ImgAuthUrlPathMap );
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foreach ( $pathMap 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 = $services->getFileBackendGroup()->backendFromPath( $storageDir );
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$filename = $storageDir . substr( $path, strlen( $prefix ) ); // strip prefix
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// Check basic user authorization
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$isAllowedUser = $permissionManager->userHasRight( $user, 'read' );
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if ( !$isAllowedUser ) {
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$this->forbidden( 'img-auth-accessdenied', 'img-auth-noread', $path );
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return;
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}
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if ( $be && $be->fileExists( [ 'src' => $filename ] ) ) {
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wfDebugLog( 'img_auth', "Streaming `" . $filename . "`." );
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$be->streamFile( [
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'src' => $filename,
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'headers' => [ 'Cache-Control: private', 'Vary: Cookie' ]
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] );
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} else {
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$this->forbidden( '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 = $services->getRepoGroup()->getLocalRepo();
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$zone = strstr( ltrim( $path, '/' ), '/', true );
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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/transcoded, and each of them should
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// be under a folder that has the source file name.
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if ( $zone === 'thumb' || $zone === 'transcoded' ) {
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$name = wfBaseName( dirname( $path ) );
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$filename = $repo->getZonePath( $zone ) . substr( $path, strlen( "/" . $zone ) );
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// Check to see if the file exists
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if ( !$repo->fileExists( $filename ) ) {
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$this->forbidden( '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 ( str_starts_with( $path, '/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 || !$file->exists() || $file->isDeleted( File::DELETED_FILE ) ) {
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$this->forbidden( '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 = []; // extra HTTP headers to send
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$title = Title::makeTitleSafe( NS_FILE, $name );
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$hookRunner = new HookRunner( $services->getHookContainer() );
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if ( !$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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if ( !$title instanceof Title ) { // files have valid titles
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$this->forbidden( 'img-auth-accessdenied', 'img-auth-badtitle', $name );
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return;
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}
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// Run hook for extension authorization plugins
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$authResult = [];
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if ( !$hookRunner->onImgAuthBeforeStream( $title, $path, $name, $authResult ) ) {
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$this->forbidden( $authResult[0], $authResult[1], array_slice( $authResult, 2 ) );
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return;
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}
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// Check user authorization for this title
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// Checks Whitelist too
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if ( !$permissionManager->userCan( 'read', $user, $title ) ) {
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$this->forbidden( 'img-auth-accessdenied', 'img-auth-noread', $name );
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return;
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}
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}
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$range = $this->environment->getServerInfo( 'HTTP_RANGE' );
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$ims = $this->environment->getServerInfo( 'HTTP_IF_MODIFIED_SINCE' );
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if ( $range !== null ) {
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$headers['Range'] = $range;
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}
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if ( $ims !== null ) {
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$headers['If-Modified-Since'] = $ims;
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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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// Allow modification of headers before streaming a file
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$hookRunner->onImgAuthModifyHeaders( $title->getTitleValue(), $headers );
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// Stream the requested file
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$this->prepareForOutput();
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[ $headers, $options ] = HTTPFileStreamer::preprocessHeaders( $headers );
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wfDebugLog( 'img_auth', "Streaming `" . $filename . "`." );
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$repo->streamFileWithStatus( $filename, $headers, $options );
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$this->enterPostSendMode();
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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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*
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* @param string $msg1
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* @param string $msg2
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* @param mixed ...$args To pass as params to $context->msg() with $msg2. Either variadic, or a single
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* array argument.
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*/
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private function forbidden( $msg1, $msg2, ...$args ) {
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$args = ( isset( $args[0] ) && is_array( $args[0] ) ) ? $args[0] : $args;
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$context = $this->getContext();
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$msgHdr = $context->msg( $msg1 )->text();
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$detailMsg = $this->getConfig( MainConfigNames::ImgAuthDetails )
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? $context->msg( $msg2, $args )->text()
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: $context->msg( 'badaccess-group0' )->text();
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wfDebugLog(
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'img_auth',
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"wfForbidden Hdr: " . $context->msg( $msg1 )->inLanguage( 'en' )->text()
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. " Msg: " . $context->msg( $msg2, $args )->inLanguage( 'en' )->text()
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);
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$this->status( 403 );
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$this->header( 'Cache-Control: no-cache' );
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$this->header( 'Content-Type: text/html; charset=utf-8' );
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$language = $context->getLanguage();
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$lang = $language->getHtmlCode();
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$this->header( "Content-Language: $lang" );
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$templateParser = new TemplateParser();
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$this->print(
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$templateParser->processTemplate( 'ImageAuthForbidden', [
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'dir' => $language->getDir(),
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'lang' => $lang,
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'msgHdr' => $msgHdr,
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'detailMsg' => $detailMsg,
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] )
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);
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}
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}
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