forked from Cyber/archwiki
228 lines
8.1 KiB
PHP
228 lines
8.1 KiB
PHP
<?php
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/**
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* The web entry point for serving non-public images to logged-in users.
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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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*
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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 REQUEST_URI or PATH_INFO; CGI-based
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* configurations sometimes 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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* @ingroup entrypoint
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*/
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define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
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define( 'MW_ENTRY_POINT', 'img_auth' );
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require __DIR__ . '/includes/WebStart.php';
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wfImageAuthMain();
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$mediawiki = new MediaWiki();
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$mediawiki->doPostOutputShutdown();
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function wfImageAuthMain() {
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global $wgImgAuthUrlPathMap, $wgScriptPath, $wgImgAuthPath;
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$services = \MediaWiki\MediaWikiServices::getInstance();
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$permissionManager = $services->getPermissionManager();
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$request = RequestContext::getMain()->getRequest();
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$publicWiki = in_array( 'read', $permissionManager->getGroupPermissions( [ '*' ] ), true );
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// Find the path assuming the request URL is relative to the local public zone URL
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$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 = WebRequest::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 = $wgImgAuthPath ?: "$wgScriptPath/img_auth.php";
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$path = WebRequest::getRequestPathSuffix( $basePath );
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}
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if ( $path === false ) {
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wfForbidden( '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 = RequestContext::getMain()->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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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 = $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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wfForbidden( 'img-auth-accessdenied', 'img-auth-noread', $path );
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return;
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}
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if ( $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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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 = $services->getRepoGroup()->getRepo( 'local' );
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$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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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 = []; // extra HTTP headers to send
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$title = Title::makeTitleSafe( NS_FILE, $name );
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if ( !$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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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 array $result */
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$result = null;
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if ( !Hooks::runner()->onImgAuthBeforeStream( $title, $path, $name, $result ) ) {
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wfForbidden( $result[0], $result[1], array_slice( $result, 2 ) );
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return;
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}
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// Check user authorization for this title
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// Checks Whitelist too
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if ( !$permissionManager->userCan( 'read', $user, $title ) ) {
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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 ( isset( $_SERVER['HTTP_RANGE'] ) ) {
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$headers['Range'] = $_SERVER['HTTP_RANGE'];
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}
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if ( isset( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
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$headers['If-Modified-Since'] = $_SERVER['HTTP_IF_MODIFIED_SINCE'];
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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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Hooks::runner()->onImgAuthModifyHeaders( $title->getTitleValue(), $headers );
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// Stream the requested file
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list( $headers, $options ) = HTTPFileStreamer::preprocessHeaders( $headers );
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wfDebugLog( 'img_auth', "Streaming `" . $filename . "`." );
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$repo->streamFileWithStatus( $filename, $headers, $options );
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}
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/**
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* Issue a standard HTTP 403 Forbidden header ($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 $msg2
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* @param mixed ...$args To pass as params to wfMessage() with $msg2. Either variadic, or a single
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* array argument.
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*/
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function wfForbidden( $msg1, $msg2, ...$args ) {
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global $wgImgAuthDetails;
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$args = ( isset( $args[0] ) && is_array( $args[0] ) ) ? $args[0] : $args;
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$msgHdr = wfMessage( $msg1 )->text();
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$detailMsgKey = $wgImgAuthDetails ? $msg2 : 'badaccess-group0';
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$detailMsg = wfMessage( $detailMsgKey, $args )->text();
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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, $args )->inLanguage( 'en' )->text()
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);
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HttpStatus::header( 403 );
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header( 'Cache-Control: no-cache' );
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header( 'Content-Type: text/html; charset=utf-8' );
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$templateParser = new TemplateParser();
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echo $templateParser->processTemplate( 'ImageAuthForbidden', [
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'msgHdr' => $msgHdr,
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'detailMsg' => $detailMsg,
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] );
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}
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