mirror of
https://github.com/YunoHost-Apps/mediawiki_ynh.git
synced 2024-09-03 19:46:05 +02:00
1742 lines
54 KiB
PHP
1742 lines
54 KiB
PHP
<?php
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/**
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* Base class for the backend of file upload.
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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 Upload
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*/
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/**
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* @defgroup Upload Upload related
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*/
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/**
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* @ingroup Upload
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*
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* UploadBase and subclasses are the backend of MediaWiki's file uploads.
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* The frontends are formed by ApiUpload and SpecialUpload.
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*
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* See also includes/docs/upload.txt
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*
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* @author Brion Vibber
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* @author Bryan Tong Minh
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* @author Michael Dale
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*/
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abstract class UploadBase {
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protected $mTempPath;
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protected $mDesiredDestName, $mDestName, $mRemoveTempFile, $mSourceType;
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protected $mTitle = false, $mTitleError = 0;
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protected $mFilteredName, $mFinalExtension;
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protected $mLocalFile, $mFileSize, $mFileProps;
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protected $mBlackListedExtensions;
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protected $mJavaDetected, $mSVGNSError;
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protected static $safeXmlEncodings = array( 'UTF-8', 'ISO-8859-1', 'ISO-8859-2', 'UTF-16', 'UTF-32' );
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const SUCCESS = 0;
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const OK = 0;
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const EMPTY_FILE = 3;
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const MIN_LENGTH_PARTNAME = 4;
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const ILLEGAL_FILENAME = 5;
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const OVERWRITE_EXISTING_FILE = 7; # Not used anymore; handled by verifyTitlePermissions()
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const FILETYPE_MISSING = 8;
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const FILETYPE_BADTYPE = 9;
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const VERIFICATION_ERROR = 10;
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# HOOK_ABORTED is the new name of UPLOAD_VERIFICATION_ERROR
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const UPLOAD_VERIFICATION_ERROR = 11;
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const HOOK_ABORTED = 11;
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const FILE_TOO_LARGE = 12;
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const WINDOWS_NONASCII_FILENAME = 13;
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const FILENAME_TOO_LONG = 14;
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const SESSION_STATUS_KEY = 'wsUploadStatusData';
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/**
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* @param $error int
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* @return string
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*/
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public function getVerificationErrorCode( $error ) {
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$code_to_status = array(
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self::EMPTY_FILE => 'empty-file',
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self::FILE_TOO_LARGE => 'file-too-large',
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self::FILETYPE_MISSING => 'filetype-missing',
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self::FILETYPE_BADTYPE => 'filetype-banned',
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self::MIN_LENGTH_PARTNAME => 'filename-tooshort',
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self::ILLEGAL_FILENAME => 'illegal-filename',
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self::OVERWRITE_EXISTING_FILE => 'overwrite',
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self::VERIFICATION_ERROR => 'verification-error',
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self::HOOK_ABORTED => 'hookaborted',
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self::WINDOWS_NONASCII_FILENAME => 'windows-nonascii-filename',
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self::FILENAME_TOO_LONG => 'filename-toolong',
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);
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if ( isset( $code_to_status[$error] ) ) {
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return $code_to_status[$error];
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}
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return 'unknown-error';
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}
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/**
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* Returns true if uploads are enabled.
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* Can be override by subclasses.
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* @return bool
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*/
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public static function isEnabled() {
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global $wgEnableUploads;
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if ( !$wgEnableUploads ) {
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return false;
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}
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# Check php's file_uploads setting
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return wfIsHipHop() || wfIniGetBool( 'file_uploads' );
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}
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/**
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* Returns true if the user can use this upload module or else a string
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* identifying the missing permission.
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* Can be overridden by subclasses.
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*
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* @param $user User
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* @return bool
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*/
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public static function isAllowed( $user ) {
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foreach ( array( 'upload', 'edit' ) as $permission ) {
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if ( !$user->isAllowed( $permission ) ) {
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return $permission;
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}
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}
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return true;
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}
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// Upload handlers. Should probably just be a global.
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static $uploadHandlers = array( 'Stash', 'File', 'Url' );
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/**
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* Create a form of UploadBase depending on wpSourceType and initializes it
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*
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* @param $request WebRequest
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* @param $type
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* @return null
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*/
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public static function createFromRequest( &$request, $type = null ) {
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$type = $type ? $type : $request->getVal( 'wpSourceType', 'File' );
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if ( !$type ) {
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return null;
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}
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// Get the upload class
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$type = ucfirst( $type );
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// Give hooks the chance to handle this request
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$className = null;
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wfRunHooks( 'UploadCreateFromRequest', array( $type, &$className ) );
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if ( is_null( $className ) ) {
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$className = 'UploadFrom' . $type;
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wfDebug( __METHOD__ . ": class name: $className\n" );
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if ( !in_array( $type, self::$uploadHandlers ) ) {
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return null;
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}
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}
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// Check whether this upload class is enabled
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if ( !call_user_func( array( $className, 'isEnabled' ) ) ) {
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return null;
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}
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// Check whether the request is valid
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if ( !call_user_func( array( $className, 'isValidRequest' ), $request ) ) {
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return null;
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}
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$handler = new $className;
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$handler->initializeFromRequest( $request );
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return $handler;
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}
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/**
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* Check whether a request if valid for this handler
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* @param $request
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* @return bool
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*/
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public static function isValidRequest( $request ) {
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return false;
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}
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public function __construct() {}
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/**
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* Returns the upload type. Should be overridden by child classes
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*
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* @since 1.18
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* @return string
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*/
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public function getSourceType() {
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return null;
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}
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/**
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* Initialize the path information
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* @param string $name the desired destination name
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* @param string $tempPath the temporary path
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* @param int $fileSize the file size
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* @param bool $removeTempFile (false) remove the temporary file?
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* @throws MWException
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*/
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public function initializePathInfo( $name, $tempPath, $fileSize, $removeTempFile = false ) {
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$this->mDesiredDestName = $name;
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if ( FileBackend::isStoragePath( $tempPath ) ) {
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throw new MWException( __METHOD__ . " given storage path `$tempPath`." );
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}
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$this->mTempPath = $tempPath;
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$this->mFileSize = $fileSize;
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$this->mRemoveTempFile = $removeTempFile;
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}
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/**
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* Initialize from a WebRequest. Override this in a subclass.
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*/
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abstract public function initializeFromRequest( &$request );
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/**
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* Fetch the file. Usually a no-op
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* @return Status
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*/
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public function fetchFile() {
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return Status::newGood();
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}
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/**
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* Return true if the file is empty
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* @return bool
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*/
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public function isEmptyFile() {
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return empty( $this->mFileSize );
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}
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/**
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* Return the file size
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* @return integer
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*/
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public function getFileSize() {
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return $this->mFileSize;
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}
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/**
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* Get the base 36 SHA1 of the file
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* @return string
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*/
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public function getTempFileSha1Base36() {
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return FSFile::getSha1Base36FromPath( $this->mTempPath );
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}
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/**
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* @param string $srcPath the source path
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* @return string|bool the real path if it was a virtual URL Returns false on failure
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*/
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function getRealPath( $srcPath ) {
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wfProfileIn( __METHOD__ );
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$repo = RepoGroup::singleton()->getLocalRepo();
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if ( $repo->isVirtualUrl( $srcPath ) ) {
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// @todo just make uploads work with storage paths
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// UploadFromStash loads files via virtual URLs
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$tmpFile = $repo->getLocalCopy( $srcPath );
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if ( $tmpFile ) {
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$tmpFile->bind( $this ); // keep alive with $this
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}
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$path = $tmpFile ? $tmpFile->getPath() : false;
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} else {
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$path = $srcPath;
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}
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wfProfileOut( __METHOD__ );
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return $path;
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}
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/**
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* Verify whether the upload is sane.
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* @return mixed self::OK or else an array with error information
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*/
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public function verifyUpload() {
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wfProfileIn( __METHOD__ );
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/**
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* If there was no filename or a zero size given, give up quick.
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*/
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if ( $this->isEmptyFile() ) {
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wfProfileOut( __METHOD__ );
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return array( 'status' => self::EMPTY_FILE );
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}
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/**
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* Honor $wgMaxUploadSize
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*/
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$maxSize = self::getMaxUploadSize( $this->getSourceType() );
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if ( $this->mFileSize > $maxSize ) {
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wfProfileOut( __METHOD__ );
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return array(
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'status' => self::FILE_TOO_LARGE,
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'max' => $maxSize,
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);
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}
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/**
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* Look at the contents of the file; if we can recognize the
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* type but it's corrupt or data of the wrong type, we should
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* probably not accept it.
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*/
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$verification = $this->verifyFile();
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if ( $verification !== true ) {
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wfProfileOut( __METHOD__ );
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return array(
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'status' => self::VERIFICATION_ERROR,
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'details' => $verification
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);
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}
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/**
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* Make sure this file can be created
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*/
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$result = $this->validateName();
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if ( $result !== true ) {
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wfProfileOut( __METHOD__ );
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return $result;
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}
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$error = '';
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if ( !wfRunHooks( 'UploadVerification',
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array( $this->mDestName, $this->mTempPath, &$error ) ) )
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{
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wfProfileOut( __METHOD__ );
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return array( 'status' => self::HOOK_ABORTED, 'error' => $error );
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}
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wfProfileOut( __METHOD__ );
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return array( 'status' => self::OK );
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}
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/**
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* Verify that the name is valid and, if necessary, that we can overwrite
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*
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* @return mixed true if valid, otherwise and array with 'status'
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* and other keys
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**/
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public function validateName() {
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$nt = $this->getTitle();
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if ( is_null( $nt ) ) {
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$result = array( 'status' => $this->mTitleError );
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if ( $this->mTitleError == self::ILLEGAL_FILENAME ) {
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$result['filtered'] = $this->mFilteredName;
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}
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if ( $this->mTitleError == self::FILETYPE_BADTYPE ) {
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$result['finalExt'] = $this->mFinalExtension;
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if ( count( $this->mBlackListedExtensions ) ) {
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$result['blacklistedExt'] = $this->mBlackListedExtensions;
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}
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}
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return $result;
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}
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$this->mDestName = $this->getLocalFile()->getName();
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return true;
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}
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/**
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* Verify the mime type.
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*
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* @note Only checks that it is not an evil mime. The does it have
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* correct extension given its mime type check is in verifyFile.
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* @param string $mime representing the mime
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* @return mixed true if the file is verified, an array otherwise
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*/
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protected function verifyMimeType( $mime ) {
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global $wgVerifyMimeType;
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wfProfileIn( __METHOD__ );
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if ( $wgVerifyMimeType ) {
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wfDebug( "\n\nmime: <$mime> extension: <{$this->mFinalExtension}>\n\n" );
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global $wgMimeTypeBlacklist;
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if ( $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
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wfProfileOut( __METHOD__ );
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return array( 'filetype-badmime', $mime );
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}
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# Check IE type
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$fp = fopen( $this->mTempPath, 'rb' );
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$chunk = fread( $fp, 256 );
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fclose( $fp );
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$magic = MimeMagic::singleton();
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$extMime = $magic->guessTypesForExtension( $this->mFinalExtension );
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$ieTypes = $magic->getIEMimeTypes( $this->mTempPath, $chunk, $extMime );
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foreach ( $ieTypes as $ieType ) {
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if ( $this->checkFileExtension( $ieType, $wgMimeTypeBlacklist ) ) {
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wfProfileOut( __METHOD__ );
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return array( 'filetype-bad-ie-mime', $ieType );
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}
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}
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}
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wfProfileOut( __METHOD__ );
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return true;
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}
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/**
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* Verifies that it's ok to include the uploaded file
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*
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* @return mixed true of the file is verified, array otherwise.
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*/
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protected function verifyFile() {
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global $wgVerifyMimeType;
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wfProfileIn( __METHOD__ );
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$status = $this->verifyPartialFile();
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if ( $status !== true ) {
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wfProfileOut( __METHOD__ );
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return $status;
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}
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$this->mFileProps = FSFile::getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
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$mime = $this->mFileProps['file-mime'];
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if ( $wgVerifyMimeType ) {
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# XXX: Missing extension will be caught by validateName() via getTitle()
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if ( $this->mFinalExtension != '' && !$this->verifyExtension( $mime, $this->mFinalExtension ) ) {
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wfProfileOut( __METHOD__ );
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return array( 'filetype-mime-mismatch', $this->mFinalExtension, $mime );
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}
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}
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$handler = MediaHandler::getHandler( $mime );
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if ( $handler ) {
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$handlerStatus = $handler->verifyUpload( $this->mTempPath );
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if ( !$handlerStatus->isOK() ) {
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$errors = $handlerStatus->getErrorsArray();
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wfProfileOut( __METHOD__ );
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return reset( $errors );
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}
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}
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wfRunHooks( 'UploadVerifyFile', array( $this, $mime, &$status ) );
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if ( $status !== true ) {
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wfProfileOut( __METHOD__ );
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return $status;
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}
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wfDebug( __METHOD__ . ": all clear; passing.\n" );
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wfProfileOut( __METHOD__ );
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return true;
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}
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/**
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* A verification routine suitable for partial files
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*
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* Runs the blacklist checks, but not any checks that may
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* assume the entire file is present.
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*
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* @return Mixed true for valid or array with error message key.
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*/
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protected function verifyPartialFile() {
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global $wgAllowJavaUploads, $wgDisableUploadScriptChecks;
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wfProfileIn( __METHOD__ );
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# getTitle() sets some internal parameters like $this->mFinalExtension
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$this->getTitle();
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$this->mFileProps = FSFile::getPropsFromPath( $this->mTempPath, $this->mFinalExtension );
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# check mime type, if desired
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$mime = $this->mFileProps['file-mime'];
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$status = $this->verifyMimeType( $mime );
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if ( $status !== true ) {
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wfProfileOut( __METHOD__ );
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return $status;
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}
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# check for htmlish code and javascript
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if ( !$wgDisableUploadScriptChecks ) {
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if ( self::detectScript( $this->mTempPath, $mime, $this->mFinalExtension ) ) {
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wfProfileOut( __METHOD__ );
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return array( 'uploadscripted' );
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}
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if ( $this->mFinalExtension == 'svg' || $mime == 'image/svg+xml' ) {
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$svgStatus = $this->detectScriptInSvg( $this->mTempPath );
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if ( $svgStatus !== false ) {
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wfProfileOut( __METHOD__ );
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return $svgStatus;
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}
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}
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}
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# Check for Java applets, which if uploaded can bypass cross-site
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|
# restrictions.
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|
if ( !$wgAllowJavaUploads ) {
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|
$this->mJavaDetected = false;
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|
$zipStatus = ZipDirectoryReader::read( $this->mTempPath,
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array( $this, 'zipEntryCallback' ) );
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|
if ( !$zipStatus->isOK() ) {
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$errors = $zipStatus->getErrorsArray();
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$error = reset( $errors );
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if ( $error[0] !== 'zip-wrong-format' ) {
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wfProfileOut( __METHOD__ );
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return $error;
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}
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}
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if ( $this->mJavaDetected ) {
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wfProfileOut( __METHOD__ );
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return array( 'uploadjava' );
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}
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}
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|
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# Scan the uploaded file for viruses
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$virus = $this->detectVirus( $this->mTempPath );
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if ( $virus ) {
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wfProfileOut( __METHOD__ );
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return array( 'uploadvirus', $virus );
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|
}
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|
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wfProfileOut( __METHOD__ );
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return true;
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}
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|
|
|
/**
|
|
* Callback for ZipDirectoryReader to detect Java class files.
|
|
*/
|
|
function zipEntryCallback( $entry ) {
|
|
$names = array( $entry['name'] );
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|
|
|
// If there is a null character, cut off the name at it, because JDK's
|
|
// ZIP_GetEntry() uses strcmp() if the name hashes match. If a file name
|
|
// were constructed which had ".class\0" followed by a string chosen to
|
|
// make the hash collide with the truncated name, that file could be
|
|
// returned in response to a request for the .class file.
|
|
$nullPos = strpos( $entry['name'], "\000" );
|
|
if ( $nullPos !== false ) {
|
|
$names[] = substr( $entry['name'], 0, $nullPos );
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}
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|
|
// If there is a trailing slash in the file name, we have to strip it,
|
|
// because that's what ZIP_GetEntry() does.
|
|
if ( preg_grep( '!\.class/?$!', $names ) ) {
|
|
$this->mJavaDetected = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Alias for verifyTitlePermissions. The function was originally 'verifyPermissions'
|
|
* but that suggests it's checking the user, when it's really checking the title + user combination.
|
|
* @param $user User object to verify the permissions against
|
|
* @return mixed An array as returned by getUserPermissionsErrors or true
|
|
* in case the user has proper permissions.
|
|
*/
|
|
public function verifyPermissions( $user ) {
|
|
return $this->verifyTitlePermissions( $user );
|
|
}
|
|
|
|
/**
|
|
* Check whether the user can edit, upload and create the image. This
|
|
* checks only against the current title; if it returns errors, it may
|
|
* very well be that another title will not give errors. Therefore
|
|
* isAllowed() should be called as well for generic is-user-blocked or
|
|
* can-user-upload checking.
|
|
*
|
|
* @param $user User object to verify the permissions against
|
|
* @return mixed An array as returned by getUserPermissionsErrors or true
|
|
* in case the user has proper permissions.
|
|
*/
|
|
public function verifyTitlePermissions( $user ) {
|
|
/**
|
|
* If the image is protected, non-sysop users won't be able
|
|
* to modify it by uploading a new revision.
|
|
*/
|
|
$nt = $this->getTitle();
|
|
if ( is_null( $nt ) ) {
|
|
return true;
|
|
}
|
|
$permErrors = $nt->getUserPermissionsErrors( 'edit', $user );
|
|
$permErrorsUpload = $nt->getUserPermissionsErrors( 'upload', $user );
|
|
if ( !$nt->exists() ) {
|
|
$permErrorsCreate = $nt->getUserPermissionsErrors( 'create', $user );
|
|
} else {
|
|
$permErrorsCreate = array();
|
|
}
|
|
if ( $permErrors || $permErrorsUpload || $permErrorsCreate ) {
|
|
$permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsUpload, $permErrors ) );
|
|
$permErrors = array_merge( $permErrors, wfArrayDiff2( $permErrorsCreate, $permErrors ) );
|
|
return $permErrors;
|
|
}
|
|
|
|
$overwriteError = $this->checkOverwrite( $user );
|
|
if ( $overwriteError !== true ) {
|
|
return array( $overwriteError );
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Check for non fatal problems with the file.
|
|
*
|
|
* This should not assume that mTempPath is set.
|
|
*
|
|
* @return Array of warnings
|
|
*/
|
|
public function checkWarnings() {
|
|
global $wgLang;
|
|
wfProfileIn( __METHOD__ );
|
|
|
|
$warnings = array();
|
|
|
|
$localFile = $this->getLocalFile();
|
|
$filename = $localFile->getName();
|
|
|
|
/**
|
|
* Check whether the resulting filename is different from the desired one,
|
|
* but ignore things like ucfirst() and spaces/underscore things
|
|
*/
|
|
$comparableName = str_replace( ' ', '_', $this->mDesiredDestName );
|
|
$comparableName = Title::capitalize( $comparableName, NS_FILE );
|
|
|
|
if ( $this->mDesiredDestName != $filename && $comparableName != $filename ) {
|
|
$warnings['badfilename'] = $filename;
|
|
}
|
|
|
|
// Check whether the file extension is on the unwanted list
|
|
global $wgCheckFileExtensions, $wgFileExtensions;
|
|
if ( $wgCheckFileExtensions ) {
|
|
$extensions = array_unique( $wgFileExtensions );
|
|
if ( !$this->checkFileExtension( $this->mFinalExtension, $extensions ) ) {
|
|
$warnings['filetype-unwanted-type'] = array( $this->mFinalExtension,
|
|
$wgLang->commaList( $extensions ), count( $extensions ) );
|
|
}
|
|
}
|
|
|
|
global $wgUploadSizeWarning;
|
|
if ( $wgUploadSizeWarning && ( $this->mFileSize > $wgUploadSizeWarning ) ) {
|
|
$warnings['large-file'] = array( $wgUploadSizeWarning, $this->mFileSize );
|
|
}
|
|
|
|
if ( $this->mFileSize == 0 ) {
|
|
$warnings['emptyfile'] = true;
|
|
}
|
|
|
|
$exists = self::getExistsWarning( $localFile );
|
|
if ( $exists !== false ) {
|
|
$warnings['exists'] = $exists;
|
|
}
|
|
|
|
// Check dupes against existing files
|
|
$hash = $this->getTempFileSha1Base36();
|
|
$dupes = RepoGroup::singleton()->findBySha1( $hash );
|
|
$title = $this->getTitle();
|
|
// Remove all matches against self
|
|
foreach ( $dupes as $key => $dupe ) {
|
|
if ( $title->equals( $dupe->getTitle() ) ) {
|
|
unset( $dupes[$key] );
|
|
}
|
|
}
|
|
if ( $dupes ) {
|
|
$warnings['duplicate'] = $dupes;
|
|
}
|
|
|
|
// Check dupes against archives
|
|
$archivedImage = new ArchivedFile( null, 0, "{$hash}.{$this->mFinalExtension}" );
|
|
if ( $archivedImage->getID() > 0 ) {
|
|
$warnings['duplicate-archive'] = $archivedImage->getName();
|
|
}
|
|
|
|
wfProfileOut( __METHOD__ );
|
|
return $warnings;
|
|
}
|
|
|
|
/**
|
|
* Really perform the upload. Stores the file in the local repo, watches
|
|
* if necessary and runs the UploadComplete hook.
|
|
*
|
|
* @param $comment
|
|
* @param $pageText
|
|
* @param $watch
|
|
* @param $user User
|
|
*
|
|
* @return Status indicating the whether the upload succeeded.
|
|
*/
|
|
public function performUpload( $comment, $pageText, $watch, $user ) {
|
|
wfProfileIn( __METHOD__ );
|
|
|
|
$status = $this->getLocalFile()->upload(
|
|
$this->mTempPath,
|
|
$comment,
|
|
$pageText,
|
|
File::DELETE_SOURCE,
|
|
$this->mFileProps,
|
|
false,
|
|
$user
|
|
);
|
|
|
|
if ( $status->isGood() ) {
|
|
if ( $watch ) {
|
|
WatchAction::doWatch( $this->getLocalFile()->getTitle(), $user, WatchedItem::IGNORE_USER_RIGHTS );
|
|
}
|
|
wfRunHooks( 'UploadComplete', array( &$this ) );
|
|
}
|
|
|
|
wfProfileOut( __METHOD__ );
|
|
return $status;
|
|
}
|
|
|
|
/**
|
|
* Returns the title of the file to be uploaded. Sets mTitleError in case
|
|
* the name was illegal.
|
|
*
|
|
* @return Title The title of the file or null in case the name was illegal
|
|
*/
|
|
public function getTitle() {
|
|
if ( $this->mTitle !== false ) {
|
|
return $this->mTitle;
|
|
}
|
|
/* Assume that if a user specified File:Something.jpg, this is an error
|
|
* and that the namespace prefix needs to be stripped of.
|
|
*/
|
|
$title = Title::newFromText( $this->mDesiredDestName );
|
|
if ( $title && $title->getNamespace() == NS_FILE ) {
|
|
$this->mFilteredName = $title->getDBkey();
|
|
} else {
|
|
$this->mFilteredName = $this->mDesiredDestName;
|
|
}
|
|
|
|
# oi_archive_name is max 255 bytes, which include a timestamp and an
|
|
# exclamation mark, so restrict file name to 240 bytes.
|
|
if ( strlen( $this->mFilteredName ) > 240 ) {
|
|
$this->mTitleError = self::FILENAME_TOO_LONG;
|
|
return $this->mTitle = null;
|
|
}
|
|
|
|
/**
|
|
* Chop off any directories in the given filename. Then
|
|
* filter out illegal characters, and try to make a legible name
|
|
* out of it. We'll strip some silently that Title would die on.
|
|
*/
|
|
$this->mFilteredName = wfStripIllegalFilenameChars( $this->mFilteredName );
|
|
/* Normalize to title form before we do any further processing */
|
|
$nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
|
|
if ( is_null( $nt ) ) {
|
|
$this->mTitleError = self::ILLEGAL_FILENAME;
|
|
return $this->mTitle = null;
|
|
}
|
|
$this->mFilteredName = $nt->getDBkey();
|
|
|
|
/**
|
|
* We'll want to blacklist against *any* 'extension', and use
|
|
* only the final one for the whitelist.
|
|
*/
|
|
list( $partname, $ext ) = $this->splitExtensions( $this->mFilteredName );
|
|
|
|
if ( count( $ext ) ) {
|
|
$this->mFinalExtension = trim( $ext[count( $ext ) - 1] );
|
|
} else {
|
|
$this->mFinalExtension = '';
|
|
|
|
# No extension, try guessing one
|
|
$magic = MimeMagic::singleton();
|
|
$mime = $magic->guessMimeType( $this->mTempPath );
|
|
if ( $mime !== 'unknown/unknown' ) {
|
|
# Get a space separated list of extensions
|
|
$extList = $magic->getExtensionsForType( $mime );
|
|
if ( $extList ) {
|
|
# Set the extension to the canonical extension
|
|
$this->mFinalExtension = strtok( $extList, ' ' );
|
|
|
|
# Fix up the other variables
|
|
$this->mFilteredName .= ".{$this->mFinalExtension}";
|
|
$nt = Title::makeTitleSafe( NS_FILE, $this->mFilteredName );
|
|
$ext = array( $this->mFinalExtension );
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Don't allow users to override the blacklist (check file extension) */
|
|
global $wgCheckFileExtensions, $wgStrictFileExtensions;
|
|
global $wgFileExtensions, $wgFileBlacklist;
|
|
|
|
$blackListedExtensions = $this->checkFileExtensionList( $ext, $wgFileBlacklist );
|
|
|
|
if ( $this->mFinalExtension == '' ) {
|
|
$this->mTitleError = self::FILETYPE_MISSING;
|
|
return $this->mTitle = null;
|
|
} elseif ( $blackListedExtensions ||
|
|
( $wgCheckFileExtensions && $wgStrictFileExtensions &&
|
|
!$this->checkFileExtensionList( $ext, $wgFileExtensions ) ) ) {
|
|
$this->mBlackListedExtensions = $blackListedExtensions;
|
|
$this->mTitleError = self::FILETYPE_BADTYPE;
|
|
return $this->mTitle = null;
|
|
}
|
|
|
|
// Windows may be broken with special characters, see bug XXX
|
|
if ( wfIsWindows() && !preg_match( '/^[\x0-\x7f]*$/', $nt->getText() ) ) {
|
|
$this->mTitleError = self::WINDOWS_NONASCII_FILENAME;
|
|
return $this->mTitle = null;
|
|
}
|
|
|
|
# If there was more than one "extension", reassemble the base
|
|
# filename to prevent bogus complaints about length
|
|
if ( count( $ext ) > 1 ) {
|
|
for ( $i = 0; $i < count( $ext ) - 1; $i++ ) {
|
|
$partname .= '.' . $ext[$i];
|
|
}
|
|
}
|
|
|
|
if ( strlen( $partname ) < 1 ) {
|
|
$this->mTitleError = self::MIN_LENGTH_PARTNAME;
|
|
return $this->mTitle = null;
|
|
}
|
|
|
|
return $this->mTitle = $nt;
|
|
}
|
|
|
|
/**
|
|
* Return the local file and initializes if necessary.
|
|
*
|
|
* @return LocalFile|null
|
|
*/
|
|
public function getLocalFile() {
|
|
if ( is_null( $this->mLocalFile ) ) {
|
|
$nt = $this->getTitle();
|
|
$this->mLocalFile = is_null( $nt ) ? null : wfLocalFile( $nt );
|
|
}
|
|
return $this->mLocalFile;
|
|
}
|
|
|
|
/**
|
|
* If the user does not supply all necessary information in the first upload form submission (either by accident or
|
|
* by design) then we may want to stash the file temporarily, get more information, and publish the file later.
|
|
*
|
|
* This method will stash a file in a temporary directory for later processing, and save the necessary descriptive info
|
|
* into the database.
|
|
* This method returns the file object, which also has a 'fileKey' property which can be passed through a form or
|
|
* API request to find this stashed file again.
|
|
*
|
|
* @param $user User
|
|
* @return UploadStashFile stashed file
|
|
*/
|
|
public function stashFile( User $user = null ) {
|
|
// was stashSessionFile
|
|
wfProfileIn( __METHOD__ );
|
|
|
|
$stash = RepoGroup::singleton()->getLocalRepo()->getUploadStash( $user );
|
|
$file = $stash->stashFile( $this->mTempPath, $this->getSourceType() );
|
|
$this->mLocalFile = $file;
|
|
|
|
wfProfileOut( __METHOD__ );
|
|
return $file;
|
|
}
|
|
|
|
/**
|
|
* Stash a file in a temporary directory, returning a key which can be used to find the file again. See stashFile().
|
|
*
|
|
* @return String: file key
|
|
*/
|
|
public function stashFileGetKey() {
|
|
return $this->stashFile()->getFileKey();
|
|
}
|
|
|
|
/**
|
|
* alias for stashFileGetKey, for backwards compatibility
|
|
*
|
|
* @return String: file key
|
|
*/
|
|
public function stashSession() {
|
|
return $this->stashFileGetKey();
|
|
}
|
|
|
|
/**
|
|
* If we've modified the upload file we need to manually remove it
|
|
* on exit to clean up.
|
|
*/
|
|
public function cleanupTempFile() {
|
|
if ( $this->mRemoveTempFile && $this->mTempPath && file_exists( $this->mTempPath ) ) {
|
|
wfDebug( __METHOD__ . ": Removing temporary file {$this->mTempPath}\n" );
|
|
unlink( $this->mTempPath );
|
|
}
|
|
}
|
|
|
|
public function getTempPath() {
|
|
return $this->mTempPath;
|
|
}
|
|
|
|
/**
|
|
* Split a file into a base name and all dot-delimited 'extensions'
|
|
* on the end. Some web server configurations will fall back to
|
|
* earlier pseudo-'extensions' to determine type and execute
|
|
* scripts, so the blacklist needs to check them all.
|
|
*
|
|
* @param $filename string
|
|
* @return array
|
|
*/
|
|
public static function splitExtensions( $filename ) {
|
|
$bits = explode( '.', $filename );
|
|
$basename = array_shift( $bits );
|
|
return array( $basename, $bits );
|
|
}
|
|
|
|
/**
|
|
* Perform case-insensitive match against a list of file extensions.
|
|
* Returns true if the extension is in the list.
|
|
*
|
|
* @param $ext String
|
|
* @param $list Array
|
|
* @return Boolean
|
|
*/
|
|
public static function checkFileExtension( $ext, $list ) {
|
|
return in_array( strtolower( $ext ), $list );
|
|
}
|
|
|
|
/**
|
|
* Perform case-insensitive match against a list of file extensions.
|
|
* Returns an array of matching extensions.
|
|
*
|
|
* @param $ext Array
|
|
* @param $list Array
|
|
* @return Boolean
|
|
*/
|
|
public static function checkFileExtensionList( $ext, $list ) {
|
|
return array_intersect( array_map( 'strtolower', $ext ), $list );
|
|
}
|
|
|
|
/**
|
|
* Checks if the mime type of the uploaded file matches the file extension.
|
|
*
|
|
* @param string $mime the mime type of the uploaded file
|
|
* @param string $extension the filename extension that the file is to be served with
|
|
* @return Boolean
|
|
*/
|
|
public static function verifyExtension( $mime, $extension ) {
|
|
$magic = MimeMagic::singleton();
|
|
|
|
if ( !$mime || $mime == 'unknown' || $mime == 'unknown/unknown' ) {
|
|
if ( !$magic->isRecognizableExtension( $extension ) ) {
|
|
wfDebug( __METHOD__ . ": passing file with unknown detected mime type; " .
|
|
"unrecognized extension '$extension', can't verify\n" );
|
|
return true;
|
|
} else {
|
|
wfDebug( __METHOD__ . ": rejecting file with unknown detected mime type; " .
|
|
"recognized extension '$extension', so probably invalid file\n" );
|
|
return false;
|
|
}
|
|
}
|
|
|
|
$match = $magic->isMatchingExtension( $extension, $mime );
|
|
|
|
if ( $match === null ) {
|
|
if ( $magic->getTypesForExtension( $extension ) !== null ) {
|
|
wfDebug( __METHOD__ . ": No extension known for $mime, but we know a mime for $extension\n" );
|
|
return false;
|
|
} else {
|
|
wfDebug( __METHOD__ . ": no file extension known for mime type $mime, passing file\n" );
|
|
return true;
|
|
}
|
|
} elseif ( $match === true ) {
|
|
wfDebug( __METHOD__ . ": mime type $mime matches extension $extension, passing file\n" );
|
|
|
|
#TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
|
|
return true;
|
|
|
|
} else {
|
|
wfDebug( __METHOD__ . ": mime type $mime mismatches file extension $extension, rejecting file\n" );
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Heuristic for detecting files that *could* contain JavaScript instructions or
|
|
* things that may look like HTML to a browser and are thus
|
|
* potentially harmful. The present implementation will produce false
|
|
* positives in some situations.
|
|
*
|
|
* @param string $file pathname to the temporary upload file
|
|
* @param string $mime the mime type of the file
|
|
* @param string $extension the extension of the file
|
|
* @return Boolean: true if the file contains something looking like embedded scripts
|
|
*/
|
|
public static function detectScript( $file, $mime, $extension ) {
|
|
global $wgAllowTitlesInSVG;
|
|
wfProfileIn( __METHOD__ );
|
|
|
|
# ugly hack: for text files, always look at the entire file.
|
|
# For binary field, just check the first K.
|
|
|
|
if ( strpos( $mime, 'text/' ) === 0 ) {
|
|
$chunk = file_get_contents( $file );
|
|
} else {
|
|
$fp = fopen( $file, 'rb' );
|
|
$chunk = fread( $fp, 1024 );
|
|
fclose( $fp );
|
|
}
|
|
|
|
$chunk = strtolower( $chunk );
|
|
|
|
if ( !$chunk ) {
|
|
wfProfileOut( __METHOD__ );
|
|
return false;
|
|
}
|
|
|
|
# decode from UTF-16 if needed (could be used for obfuscation).
|
|
if ( substr( $chunk, 0, 2 ) == "\xfe\xff" ) {
|
|
$enc = 'UTF-16BE';
|
|
} elseif ( substr( $chunk, 0, 2 ) == "\xff\xfe" ) {
|
|
$enc = 'UTF-16LE';
|
|
} else {
|
|
$enc = null;
|
|
}
|
|
|
|
if ( $enc ) {
|
|
$chunk = iconv( $enc, "ASCII//IGNORE", $chunk );
|
|
}
|
|
|
|
$chunk = trim( $chunk );
|
|
|
|
# @todo FIXME: Convert from UTF-16 if necessary!
|
|
wfDebug( __METHOD__ . ": checking for embedded scripts and HTML stuff\n" );
|
|
|
|
# check for HTML doctype
|
|
if ( preg_match( "/<!DOCTYPE *X?HTML/i", $chunk ) ) {
|
|
wfProfileOut( __METHOD__ );
|
|
return true;
|
|
}
|
|
|
|
// Some browsers will interpret obscure xml encodings as UTF-8, while
|
|
// PHP/expat will interpret the given encoding in the xml declaration (bug 47304)
|
|
if ( $extension == 'svg' || strpos( $mime, 'image/svg' ) === 0 ) {
|
|
if ( self::checkXMLEncodingMissmatch( $file ) ) {
|
|
wfProfileOut( __METHOD__ );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Internet Explorer for Windows performs some really stupid file type
|
|
* autodetection which can cause it to interpret valid image files as HTML
|
|
* and potentially execute JavaScript, creating a cross-site scripting
|
|
* attack vectors.
|
|
*
|
|
* Apple's Safari browser also performs some unsafe file type autodetection
|
|
* which can cause legitimate files to be interpreted as HTML if the
|
|
* web server is not correctly configured to send the right content-type
|
|
* (or if you're really uploading plain text and octet streams!)
|
|
*
|
|
* Returns true if IE is likely to mistake the given file for HTML.
|
|
* Also returns true if Safari would mistake the given file for HTML
|
|
* when served with a generic content-type.
|
|
*/
|
|
$tags = array(
|
|
'<a href',
|
|
'<body',
|
|
'<head',
|
|
'<html', #also in safari
|
|
'<img',
|
|
'<pre',
|
|
'<script', #also in safari
|
|
'<table'
|
|
);
|
|
|
|
if ( !$wgAllowTitlesInSVG && $extension !== 'svg' && $mime !== 'image/svg' ) {
|
|
$tags[] = '<title';
|
|
}
|
|
|
|
foreach ( $tags as $tag ) {
|
|
if ( false !== strpos( $chunk, $tag ) ) {
|
|
wfDebug( __METHOD__ . ": found something that may make it be mistaken for html: $tag\n" );
|
|
wfProfileOut( __METHOD__ );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* look for JavaScript
|
|
*/
|
|
|
|
# resolve entity-refs to look at attributes. may be harsh on big files... cache result?
|
|
$chunk = Sanitizer::decodeCharReferences( $chunk );
|
|
|
|
# look for script-types
|
|
if ( preg_match( '!type\s*=\s*[\'"]?\s*(?:\w*/)?(?:ecma|java)!sim', $chunk ) ) {
|
|
wfDebug( __METHOD__ . ": found script types\n" );
|
|
wfProfileOut( __METHOD__ );
|
|
return true;
|
|
}
|
|
|
|
# look for html-style script-urls
|
|
if ( preg_match( '!(?:href|src|data)\s*=\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) ) {
|
|
wfDebug( __METHOD__ . ": found html-style script urls\n" );
|
|
wfProfileOut( __METHOD__ );
|
|
return true;
|
|
}
|
|
|
|
# look for css-style script-urls
|
|
if ( preg_match( '!url\s*\(\s*[\'"]?\s*(?:ecma|java)script:!sim', $chunk ) ) {
|
|
wfDebug( __METHOD__ . ": found css-style script urls\n" );
|
|
wfProfileOut( __METHOD__ );
|
|
return true;
|
|
}
|
|
|
|
wfDebug( __METHOD__ . ": no scripts found\n" );
|
|
wfProfileOut( __METHOD__ );
|
|
return false;
|
|
}
|
|
|
|
|
|
/**
|
|
* Check a whitelist of xml encodings that are known not to be interpreted differently
|
|
* by the server's xml parser (expat) and some common browsers.
|
|
*
|
|
* @param string $file pathname to the temporary upload file
|
|
* @return Boolean: true if the file contains an encoding that could be misinterpreted
|
|
*/
|
|
public static function checkXMLEncodingMissmatch( $file ) {
|
|
global $wgSVGMetadataCutoff;
|
|
$contents = file_get_contents( $file, false, null, -1, $wgSVGMetadataCutoff );
|
|
$encodingRegex = '!encoding[ \t\n\r]*=[ \t\n\r]*[\'"](.*?)[\'"]!si';
|
|
|
|
if ( preg_match( "!<\?xml\b(.*?)\?>!si", $contents, $matches ) ) {
|
|
if ( preg_match( $encodingRegex, $matches[1], $encMatch )
|
|
&& !in_array( strtoupper( $encMatch[1] ), self::$safeXmlEncodings )
|
|
) {
|
|
wfDebug( __METHOD__ . ": Found unsafe XML encoding '{$encMatch[1]}'\n" );
|
|
return true;
|
|
}
|
|
} elseif ( preg_match( "!<\?xml\b!si", $contents ) ) {
|
|
// Start of XML declaration without an end in the first $wgSVGMetadataCutoff
|
|
// bytes. There shouldn't be a legitimate reason for this to happen.
|
|
wfDebug( __METHOD__ . ": Unmatched XML declaration start\n" );
|
|
return true;
|
|
} elseif ( substr( $contents, 0, 4 ) == "\x4C\x6F\xA7\x94" ) {
|
|
// EBCDIC encoded XML
|
|
wfDebug( __METHOD__ . ": EBCDIC Encoded XML\n" );
|
|
return true;
|
|
}
|
|
|
|
// It's possible the file is encoded with multi-byte encoding, so re-encode attempt to
|
|
// detect the encoding in case is specifies an encoding not whitelisted in self::$safeXmlEncodings
|
|
$attemptEncodings = array( 'UTF-16', 'UTF-16BE', 'UTF-32', 'UTF-32BE' );
|
|
foreach ( $attemptEncodings as $encoding ) {
|
|
wfSuppressWarnings();
|
|
$str = iconv( $encoding, 'UTF-8', $contents );
|
|
wfRestoreWarnings();
|
|
if ( $str != '' && preg_match( "!<\?xml\b(.*?)\?>!si", $str, $matches ) ) {
|
|
if ( preg_match( $encodingRegex, $matches[1], $encMatch )
|
|
&& !in_array( strtoupper( $encMatch[1] ), self::$safeXmlEncodings )
|
|
) {
|
|
wfDebug( __METHOD__ . ": Found unsafe XML encoding '{$encMatch[1]}'\n" );
|
|
return true;
|
|
}
|
|
} elseif ( $str != '' && preg_match( "!<\?xml\b!si", $str ) ) {
|
|
// Start of XML declaration without an end in the first $wgSVGMetadataCutoff
|
|
// bytes. There shouldn't be a legitimate reason for this to happen.
|
|
wfDebug( __METHOD__ . ": Unmatched XML declaration start\n" );
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @param $filename string
|
|
* @return bool
|
|
*/
|
|
protected function detectScriptInSvg( $filename ) {
|
|
$this->mSVGNSError = false;
|
|
$check = new XmlTypeCheck(
|
|
$filename,
|
|
array( $this, 'checkSvgScriptCallback' ),
|
|
true,
|
|
array( 'processing_instruction_handler' => 'UploadBase::checkSvgPICallback' )
|
|
);
|
|
if ( $check->wellFormed !== true ) {
|
|
// Invalid xml (bug 58553)
|
|
return array( 'uploadinvalidxml' );
|
|
} elseif ( $check->filterMatch ) {
|
|
if ( $this->mSVGNSError ) {
|
|
return array( 'uploadscriptednamespace', $this->mSVGNSError );
|
|
}
|
|
return array( 'uploadscripted' );
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Callback to filter SVG Processing Instructions.
|
|
* @param $target string processing instruction name
|
|
* @param $data string processing instruction attribute and value
|
|
* @return bool (true if the filter identified something bad)
|
|
*/
|
|
public static function checkSvgPICallback( $target, $data ) {
|
|
// Don't allow external stylesheets (bug 57550)
|
|
if ( preg_match( '/xml-stylesheet/i', $target) ) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* @todo Replace this with a whitelist filter!
|
|
* @param $element string
|
|
* @param $attribs array
|
|
* @return bool
|
|
*/
|
|
public function checkSvgScriptCallback( $element, $attribs ) {
|
|
list( $namespace, $strippedElement ) = $this->splitXmlNamespace( $element );
|
|
|
|
static $validNamespaces = array(
|
|
'',
|
|
'adobe:ns:meta/',
|
|
'http://creativecommons.org/ns#',
|
|
'http://inkscape.sourceforge.net/dtd/sodipodi-0.dtd',
|
|
'http://ns.adobe.com/adobeillustrator/10.0/',
|
|
'http://ns.adobe.com/adobesvgviewerextensions/3.0/',
|
|
'http://ns.adobe.com/extensibility/1.0/',
|
|
'http://ns.adobe.com/flows/1.0/',
|
|
'http://ns.adobe.com/illustrator/1.0/',
|
|
'http://ns.adobe.com/imagereplacement/1.0/',
|
|
'http://ns.adobe.com/pdf/1.3/',
|
|
'http://ns.adobe.com/photoshop/1.0/',
|
|
'http://ns.adobe.com/saveforweb/1.0/',
|
|
'http://ns.adobe.com/variables/1.0/',
|
|
'http://ns.adobe.com/xap/1.0/',
|
|
'http://ns.adobe.com/xap/1.0/g/',
|
|
'http://ns.adobe.com/xap/1.0/g/img/',
|
|
'http://ns.adobe.com/xap/1.0/mm/',
|
|
'http://ns.adobe.com/xap/1.0/rights/',
|
|
'http://ns.adobe.com/xap/1.0/stype/dimensions#',
|
|
'http://ns.adobe.com/xap/1.0/stype/font#',
|
|
'http://ns.adobe.com/xap/1.0/stype/manifestitem#',
|
|
'http://ns.adobe.com/xap/1.0/stype/resourceevent#',
|
|
'http://ns.adobe.com/xap/1.0/stype/resourceref#',
|
|
'http://ns.adobe.com/xap/1.0/t/pg/',
|
|
'http://purl.org/dc/elements/1.1/',
|
|
'http://purl.org/dc/elements/1.1',
|
|
'http://schemas.microsoft.com/visio/2003/svgextensions/',
|
|
'http://sodipodi.sourceforge.net/dtd/sodipodi-0.dtd',
|
|
'http://web.resource.org/cc/',
|
|
'http://www.freesoftware.fsf.org/bkchem/cdml',
|
|
'http://www.inkscape.org/namespaces/inkscape',
|
|
'http://www.w3.org/1999/02/22-rdf-syntax-ns#',
|
|
'http://www.w3.org/2000/svg',
|
|
);
|
|
|
|
if ( !in_array( $namespace, $validNamespaces ) ) {
|
|
wfDebug( __METHOD__ . ": Non-svg namespace '$namespace' in uploaded file.\n" );
|
|
// @TODO return a status object to a closure in XmlTypeCheck, for MW1.21+
|
|
$this->mSVGNSError = $namespace;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* check for elements that can contain javascript
|
|
*/
|
|
if ( $strippedElement == 'script' ) {
|
|
wfDebug( __METHOD__ . ": Found script element '$element' in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# e.g., <svg xmlns="http://www.w3.org/2000/svg"> <handler xmlns:ev="http://www.w3.org/2001/xml-events" ev:event="load">alert(1)</handler> </svg>
|
|
if ( $strippedElement == 'handler' ) {
|
|
wfDebug( __METHOD__ . ": Found scriptable element '$element' in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# SVG reported in Feb '12 that used xml:stylesheet to generate javascript block
|
|
if ( $strippedElement == 'stylesheet' ) {
|
|
wfDebug( __METHOD__ . ": Found scriptable element '$element' in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# Block iframes, in case they pass the namespace check
|
|
if ( $strippedElement == 'iframe' ) {
|
|
wfDebug( __METHOD__ . ": iframe in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
foreach ( $attribs as $attrib => $value ) {
|
|
$stripped = $this->stripXmlNamespace( $attrib );
|
|
$value = strtolower( $value );
|
|
|
|
if ( substr( $stripped, 0, 2 ) == 'on' ) {
|
|
wfDebug( __METHOD__ . ": Found event-handler attribute '$attrib'='$value' in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# href with javascript target
|
|
if ( $stripped == 'href' && strpos( strtolower( $value ), 'javascript:' ) !== false ) {
|
|
wfDebug( __METHOD__ . ": Found script in href attribute '$attrib'='$value' in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# href with embedded svg as target
|
|
if ( $stripped == 'href' && preg_match( '!data:[^,]*image/svg[^,]*,!sim', $value ) ) {
|
|
wfDebug( __METHOD__ . ": Found href to embedded svg \"<$strippedElement '$attrib'='$value'...\" in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# href with embedded (text/xml) svg as target
|
|
if ( $stripped == 'href' && preg_match( '!data:[^,]*text/xml[^,]*,!sim', $value ) ) {
|
|
wfDebug( __METHOD__ . ": Found href to embedded svg \"<$strippedElement '$attrib'='$value'...\" in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# use set/animate to add event-handler attribute to parent
|
|
if ( ( $strippedElement == 'set' || $strippedElement == 'animate' ) && $stripped == 'attributename' && substr( $value, 0, 2 ) == 'on' ) {
|
|
wfDebug( __METHOD__ . ": Found svg setting event-handler attribute with \"<$strippedElement $stripped='$value'...\" in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# use set to add href attribute to parent element
|
|
if ( $strippedElement == 'set' && $stripped == 'attributename' && strpos( $value, 'href' ) !== false ) {
|
|
wfDebug( __METHOD__ . ": Found svg setting href attribute '$value' in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# use set to add a remote / data / script target to an element
|
|
if ( $strippedElement == 'set' && $stripped == 'to' && preg_match( '!(http|https|data|script):!sim', $value ) ) {
|
|
wfDebug( __METHOD__ . ": Found svg setting attribute to '$value' in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# use handler attribute with remote / data / script
|
|
if ( $stripped == 'handler' && preg_match( '!(http|https|data|script):!sim', $value ) ) {
|
|
wfDebug( __METHOD__ . ": Found svg setting handler with remote/data/script '$attrib'='$value' in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
# use CSS styles to bring in remote code
|
|
# catch url("http:..., url('http:..., url(http:..., but not url("#..., url('#..., url(#....
|
|
if ( $stripped == 'style' && preg_match_all( '!((?:font|clip-path|fill|filter|marker|marker-end|marker-mid|marker-start|mask|stroke)\s*:\s*url\s*\(\s*["\']?\s*[^#]+.*?\))!sim', $value, $matches ) ) {
|
|
foreach ( $matches[1] as $match ) {
|
|
if ( !preg_match( '!(?:font|clip-path|fill|filter|marker|marker-end|marker-mid|marker-start|mask|stroke)\s*:\s*url\s*\(\s*(#|\'#|"#)!sim', $match ) ) {
|
|
wfDebug( __METHOD__ . ": Found svg setting a style with remote url '$attrib'='$value' in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
# image filters can pull in url, which could be svg that executes scripts
|
|
if ( $strippedElement == 'image' && $stripped == 'filter' && preg_match( '!url\s*\(!sim', $value ) ) {
|
|
wfDebug( __METHOD__ . ": Found image filter with url: \"<$strippedElement $stripped='$value'...\" in uploaded file.\n" );
|
|
return true;
|
|
}
|
|
|
|
}
|
|
|
|
return false; //No scripts detected
|
|
}
|
|
|
|
/**
|
|
* Divide the element name passed by the xml parser to the callback into URI and prifix.
|
|
* @param $name string
|
|
* @return array containing the namespace URI and prefix
|
|
*/
|
|
private static function splitXmlNamespace( $element ) {
|
|
// 'http://www.w3.org/2000/svg:script' -> array( 'http://www.w3.org/2000/svg', 'script' )
|
|
$parts = explode( ':', strtolower( $element ) );
|
|
$name = array_pop( $parts );
|
|
$ns = implode( ':', $parts );
|
|
return array( $ns, $name );
|
|
}
|
|
|
|
/**
|
|
* @param $name string
|
|
* @return string
|
|
*/
|
|
private function stripXmlNamespace( $name ) {
|
|
// 'http://www.w3.org/2000/svg:script' -> 'script'
|
|
$parts = explode( ':', strtolower( $name ) );
|
|
return array_pop( $parts );
|
|
}
|
|
|
|
/**
|
|
* Generic wrapper function for a virus scanner program.
|
|
* This relies on the $wgAntivirus and $wgAntivirusSetup variables.
|
|
* $wgAntivirusRequired may be used to deny upload if the scan fails.
|
|
*
|
|
* @param string $file pathname to the temporary upload file
|
|
* @return mixed false if not virus is found, NULL if the scan fails or is disabled,
|
|
* or a string containing feedback from the virus scanner if a virus was found.
|
|
* If textual feedback is missing but a virus was found, this function returns true.
|
|
*/
|
|
public static function detectVirus( $file ) {
|
|
global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired, $wgOut;
|
|
wfProfileIn( __METHOD__ );
|
|
|
|
if ( !$wgAntivirus ) {
|
|
wfDebug( __METHOD__ . ": virus scanner disabled\n" );
|
|
wfProfileOut( __METHOD__ );
|
|
return null;
|
|
}
|
|
|
|
if ( !$wgAntivirusSetup[$wgAntivirus] ) {
|
|
wfDebug( __METHOD__ . ": unknown virus scanner: $wgAntivirus\n" );
|
|
$wgOut->wrapWikiMsg( "<div class=\"error\">\n$1\n</div>",
|
|
array( 'virus-badscanner', $wgAntivirus ) );
|
|
wfProfileOut( __METHOD__ );
|
|
return wfMessage( 'virus-unknownscanner' )->text() . " $wgAntivirus";
|
|
}
|
|
|
|
# look up scanner configuration
|
|
$command = $wgAntivirusSetup[$wgAntivirus]['command'];
|
|
$exitCodeMap = $wgAntivirusSetup[$wgAntivirus]['codemap'];
|
|
$msgPattern = isset( $wgAntivirusSetup[$wgAntivirus]['messagepattern'] ) ?
|
|
$wgAntivirusSetup[$wgAntivirus]['messagepattern'] : null;
|
|
|
|
if ( strpos( $command, "%f" ) === false ) {
|
|
# simple pattern: append file to scan
|
|
$command .= " " . wfEscapeShellArg( $file );
|
|
} else {
|
|
# complex pattern: replace "%f" with file to scan
|
|
$command = str_replace( "%f", wfEscapeShellArg( $file ), $command );
|
|
}
|
|
|
|
wfDebug( __METHOD__ . ": running virus scan: $command \n" );
|
|
|
|
# execute virus scanner
|
|
$exitCode = false;
|
|
|
|
# NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
|
|
# that does not seem to be worth the pain.
|
|
# Ask me (Duesentrieb) about it if it's ever needed.
|
|
$output = wfShellExecWithStderr( $command, $exitCode );
|
|
|
|
# map exit code to AV_xxx constants.
|
|
$mappedCode = $exitCode;
|
|
if ( $exitCodeMap ) {
|
|
if ( isset( $exitCodeMap[$exitCode] ) ) {
|
|
$mappedCode = $exitCodeMap[$exitCode];
|
|
} elseif ( isset( $exitCodeMap["*"] ) ) {
|
|
$mappedCode = $exitCodeMap["*"];
|
|
}
|
|
}
|
|
|
|
/* NB: AV_NO_VIRUS is 0 but AV_SCAN_FAILED is false,
|
|
* so we need the strict equalities === and thus can't use a switch here
|
|
*/
|
|
if ( $mappedCode === AV_SCAN_FAILED ) {
|
|
# scan failed (code was mapped to false by $exitCodeMap)
|
|
wfDebug( __METHOD__ . ": failed to scan $file (code $exitCode).\n" );
|
|
|
|
$output = $wgAntivirusRequired ? wfMessage( 'virus-scanfailed', array( $exitCode ) )->text() : null;
|
|
} elseif ( $mappedCode === AV_SCAN_ABORTED ) {
|
|
# scan failed because filetype is unknown (probably imune)
|
|
wfDebug( __METHOD__ . ": unsupported file type $file (code $exitCode).\n" );
|
|
$output = null;
|
|
} elseif ( $mappedCode === AV_NO_VIRUS ) {
|
|
# no virus found
|
|
wfDebug( __METHOD__ . ": file passed virus scan.\n" );
|
|
$output = false;
|
|
} else {
|
|
$output = trim( $output );
|
|
|
|
if ( !$output ) {
|
|
$output = true; #if there's no output, return true
|
|
} elseif ( $msgPattern ) {
|
|
$groups = array();
|
|
if ( preg_match( $msgPattern, $output, $groups ) ) {
|
|
if ( $groups[1] ) {
|
|
$output = $groups[1];
|
|
}
|
|
}
|
|
}
|
|
|
|
wfDebug( __METHOD__ . ": FOUND VIRUS! scanner feedback: $output \n" );
|
|
}
|
|
|
|
wfProfileOut( __METHOD__ );
|
|
return $output;
|
|
}
|
|
|
|
/**
|
|
* Check if there's an overwrite conflict and, if so, if restrictions
|
|
* forbid this user from performing the upload.
|
|
*
|
|
* @param $user User
|
|
*
|
|
* @return mixed true on success, array on failure
|
|
*/
|
|
private function checkOverwrite( $user ) {
|
|
// First check whether the local file can be overwritten
|
|
$file = $this->getLocalFile();
|
|
if ( $file->exists() ) {
|
|
if ( !self::userCanReUpload( $user, $file ) ) {
|
|
return array( 'fileexists-forbidden', $file->getName() );
|
|
} else {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/* Check shared conflicts: if the local file does not exist, but
|
|
* wfFindFile finds a file, it exists in a shared repository.
|
|
*/
|
|
$file = wfFindFile( $this->getTitle() );
|
|
if ( $file && !$user->isAllowed( 'reupload-shared' ) ) {
|
|
return array( 'fileexists-shared-forbidden', $file->getName() );
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Check if a user is the last uploader
|
|
*
|
|
* @param $user User object
|
|
* @param string $img image name
|
|
* @return Boolean
|
|
*/
|
|
public static function userCanReUpload( User $user, $img ) {
|
|
if ( $user->isAllowed( 'reupload' ) ) {
|
|
return true; // non-conditional
|
|
}
|
|
if ( !$user->isAllowed( 'reupload-own' ) ) {
|
|
return false;
|
|
}
|
|
if ( is_string( $img ) ) {
|
|
$img = wfLocalFile( $img );
|
|
}
|
|
if ( !( $img instanceof LocalFile ) ) {
|
|
return false;
|
|
}
|
|
|
|
return $user->getId() == $img->getUser( 'id' );
|
|
}
|
|
|
|
/**
|
|
* Helper function that does various existence checks for a file.
|
|
* The following checks are performed:
|
|
* - The file exists
|
|
* - Article with the same name as the file exists
|
|
* - File exists with normalized extension
|
|
* - The file looks like a thumbnail and the original exists
|
|
*
|
|
* @param $file File The File object to check
|
|
* @return mixed False if the file does not exists, else an array
|
|
*/
|
|
public static function getExistsWarning( $file ) {
|
|
if ( $file->exists() ) {
|
|
return array( 'warning' => 'exists', 'file' => $file );
|
|
}
|
|
|
|
if ( $file->getTitle()->getArticleID() ) {
|
|
return array( 'warning' => 'page-exists', 'file' => $file );
|
|
}
|
|
|
|
if ( $file->wasDeleted() && !$file->exists() ) {
|
|
return array( 'warning' => 'was-deleted', 'file' => $file );
|
|
}
|
|
|
|
if ( strpos( $file->getName(), '.' ) == false ) {
|
|
$partname = $file->getName();
|
|
$extension = '';
|
|
} else {
|
|
$n = strrpos( $file->getName(), '.' );
|
|
$extension = substr( $file->getName(), $n + 1 );
|
|
$partname = substr( $file->getName(), 0, $n );
|
|
}
|
|
$normalizedExtension = File::normalizeExtension( $extension );
|
|
|
|
if ( $normalizedExtension != $extension ) {
|
|
// We're not using the normalized form of the extension.
|
|
// Normal form is lowercase, using most common of alternate
|
|
// extensions (eg 'jpg' rather than 'JPEG').
|
|
//
|
|
// Check for another file using the normalized form...
|
|
$nt_lc = Title::makeTitle( NS_FILE, "{$partname}.{$normalizedExtension}" );
|
|
$file_lc = wfLocalFile( $nt_lc );
|
|
|
|
if ( $file_lc->exists() ) {
|
|
return array(
|
|
'warning' => 'exists-normalized',
|
|
'file' => $file,
|
|
'normalizedFile' => $file_lc
|
|
);
|
|
}
|
|
}
|
|
|
|
// Check for files with the same name but a different extension
|
|
$similarFiles = RepoGroup::singleton()->getLocalRepo()->findFilesByPrefix(
|
|
"{$partname}.", 1 );
|
|
if ( count( $similarFiles ) ) {
|
|
return array(
|
|
'warning' => 'exists-normalized',
|
|
'file' => $file,
|
|
'normalizedFile' => $similarFiles[0],
|
|
);
|
|
}
|
|
|
|
if ( self::isThumbName( $file->getName() ) ) {
|
|
# Check for filenames like 50px- or 180px-, these are mostly thumbnails
|
|
$nt_thb = Title::newFromText( substr( $partname, strpos( $partname, '-' ) + 1 ) . '.' . $extension, NS_FILE );
|
|
$file_thb = wfLocalFile( $nt_thb );
|
|
if ( $file_thb->exists() ) {
|
|
return array(
|
|
'warning' => 'thumb',
|
|
'file' => $file,
|
|
'thumbFile' => $file_thb
|
|
);
|
|
} else {
|
|
// File does not exist, but we just don't like the name
|
|
return array(
|
|
'warning' => 'thumb-name',
|
|
'file' => $file,
|
|
'thumbFile' => $file_thb
|
|
);
|
|
}
|
|
}
|
|
|
|
foreach ( self::getFilenamePrefixBlacklist() as $prefix ) {
|
|
if ( substr( $partname, 0, strlen( $prefix ) ) == $prefix ) {
|
|
return array(
|
|
'warning' => 'bad-prefix',
|
|
'file' => $file,
|
|
'prefix' => $prefix
|
|
);
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Helper function that checks whether the filename looks like a thumbnail
|
|
* @param $filename string
|
|
* @return bool
|
|
*/
|
|
public static function isThumbName( $filename ) {
|
|
$n = strrpos( $filename, '.' );
|
|
$partname = $n ? substr( $filename, 0, $n ) : $filename;
|
|
return (
|
|
substr( $partname, 3, 3 ) == 'px-' ||
|
|
substr( $partname, 2, 3 ) == 'px-'
|
|
) &&
|
|
preg_match( "/[0-9]{2}/", substr( $partname, 0, 2 ) );
|
|
}
|
|
|
|
/**
|
|
* Get a list of blacklisted filename prefixes from [[MediaWiki:Filename-prefix-blacklist]]
|
|
*
|
|
* @return array list of prefixes
|
|
*/
|
|
public static function getFilenamePrefixBlacklist() {
|
|
$blacklist = array();
|
|
$message = wfMessage( 'filename-prefix-blacklist' )->inContentLanguage();
|
|
if ( !$message->isDisabled() ) {
|
|
$lines = explode( "\n", $message->plain() );
|
|
foreach ( $lines as $line ) {
|
|
// Remove comment lines
|
|
$comment = substr( trim( $line ), 0, 1 );
|
|
if ( $comment == '#' || $comment == '' ) {
|
|
continue;
|
|
}
|
|
// Remove additional comments after a prefix
|
|
$comment = strpos( $line, '#' );
|
|
if ( $comment > 0 ) {
|
|
$line = substr( $line, 0, $comment - 1 );
|
|
}
|
|
$blacklist[] = trim( $line );
|
|
}
|
|
}
|
|
return $blacklist;
|
|
}
|
|
|
|
/**
|
|
* Gets image info about the file just uploaded.
|
|
*
|
|
* Also has the effect of setting metadata to be an 'indexed tag name' in returned API result if
|
|
* 'metadata' was requested. Oddly, we have to pass the "result" object down just so it can do that
|
|
* with the appropriate format, presumably.
|
|
*
|
|
* @param $result ApiResult:
|
|
* @return Array: image info
|
|
*/
|
|
public function getImageInfo( $result ) {
|
|
$file = $this->getLocalFile();
|
|
// TODO This cries out for refactoring. We really want to say $file->getAllInfo(); here.
|
|
// Perhaps "info" methods should be moved into files, and the API should just wrap them in queries.
|
|
if ( $file instanceof UploadStashFile ) {
|
|
$imParam = ApiQueryStashImageInfo::getPropertyNames();
|
|
$info = ApiQueryStashImageInfo::getInfo( $file, array_flip( $imParam ), $result );
|
|
} else {
|
|
$imParam = ApiQueryImageInfo::getPropertyNames();
|
|
$info = ApiQueryImageInfo::getInfo( $file, array_flip( $imParam ), $result );
|
|
}
|
|
return $info;
|
|
}
|
|
|
|
/**
|
|
* @param $error array
|
|
* @return Status
|
|
*/
|
|
public function convertVerifyErrorToStatus( $error ) {
|
|
$code = $error['status'];
|
|
unset( $code['status'] );
|
|
return Status::newFatal( $this->getVerificationErrorCode( $code ), $error );
|
|
}
|
|
|
|
/**
|
|
* @param $forType null|string
|
|
* @return int
|
|
*/
|
|
public static function getMaxUploadSize( $forType = null ) {
|
|
global $wgMaxUploadSize;
|
|
|
|
if ( is_array( $wgMaxUploadSize ) ) {
|
|
if ( !is_null( $forType ) && isset( $wgMaxUploadSize[$forType] ) ) {
|
|
return $wgMaxUploadSize[$forType];
|
|
} else {
|
|
return $wgMaxUploadSize['*'];
|
|
}
|
|
} else {
|
|
return intval( $wgMaxUploadSize );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the current status of a chunked upload (used for polling).
|
|
* The status will be read from the *current* user session.
|
|
* @param $statusKey string
|
|
* @return Array|bool
|
|
*/
|
|
public static function getSessionStatus( $statusKey ) {
|
|
return isset( $_SESSION[self::SESSION_STATUS_KEY][$statusKey] )
|
|
? $_SESSION[self::SESSION_STATUS_KEY][$statusKey]
|
|
: false;
|
|
}
|
|
|
|
/**
|
|
* Set the current status of a chunked upload (used for polling).
|
|
* The status will be stored in the *current* user session.
|
|
* @param $statusKey string
|
|
* @param $value array|false
|
|
* @return void
|
|
*/
|
|
public static function setSessionStatus( $statusKey, $value ) {
|
|
if ( $value === false ) {
|
|
unset( $_SESSION[self::SESSION_STATUS_KEY][$statusKey] );
|
|
} else {
|
|
$_SESSION[self::SESSION_STATUS_KEY][$statusKey] = $value;
|
|
}
|
|
}
|
|
}
|