1010 lines
31 KiB
PHP
1010 lines
31 KiB
PHP
<?php
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/**
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*
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* @package MediaWiki
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* @subpackage SpecialPage
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*/
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/**
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*
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*/
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require_once 'Image.php';
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require_once 'MacBinary.php';
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require_once 'Licenses.php';
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/**
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* Entry point
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*/
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function wfSpecialUpload() {
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global $wgRequest;
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$form = new UploadForm( $wgRequest );
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$form->execute();
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}
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/**
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*
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* @package MediaWiki
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* @subpackage SpecialPage
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*/
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class UploadForm {
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/**#@+
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* @access private
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*/
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var $mUploadFile, $mUploadDescription, $mLicense ,$mIgnoreWarning, $mUploadError;
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var $mUploadSaveName, $mUploadTempName, $mUploadSize, $mUploadOldVersion;
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var $mUploadCopyStatus, $mUploadSource, $mReUpload, $mAction, $mUpload;
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var $mOname, $mSessionKey, $mStashed, $mDestFile, $mRemoveTempFile;
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/**#@-*/
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/**
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* Constructor : initialise object
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* Get data POSTed through the form and assign them to the object
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* @param $request Data posted.
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*/
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function UploadForm( &$request ) {
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$this->mDestFile = $request->getText( 'wpDestFile' );
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if( !$request->wasPosted() ) {
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# GET requests just give the main form; no data except wpDestfile.
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return;
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}
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$this->mIgnoreWarning = $request->getCheck( 'wpIgnoreWarning');
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$this->mReUpload = $request->getCheck( 'wpReUpload' );
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$this->mUpload = $request->getCheck( 'wpUpload' );
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$this->mUploadDescription = $request->getText( 'wpUploadDescription' );
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$this->mLicense = $request->getText( 'wpLicense' );
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$this->mUploadCopyStatus = $request->getText( 'wpUploadCopyStatus' );
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$this->mUploadSource = $request->getText( 'wpUploadSource');
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$this->mAction = $request->getVal( 'action' );
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$this->mSessionKey = $request->getInt( 'wpSessionKey' );
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if( !empty( $this->mSessionKey ) &&
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isset( $_SESSION['wsUploadData'][$this->mSessionKey] ) ) {
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/**
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* Confirming a temporarily stashed upload.
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* We don't want path names to be forged, so we keep
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* them in the session on the server and just give
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* an opaque key to the user agent.
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*/
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$data = $_SESSION['wsUploadData'][$this->mSessionKey];
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$this->mUploadTempName = $data['mUploadTempName'];
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$this->mUploadSize = $data['mUploadSize'];
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$this->mOname = $data['mOname'];
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$this->mUploadError = 0/*UPLOAD_ERR_OK*/;
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$this->mStashed = true;
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$this->mRemoveTempFile = false;
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} else {
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/**
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*Check for a newly uploaded file.
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*/
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$this->mUploadTempName = $request->getFileTempName( 'wpUploadFile' );
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$this->mUploadSize = $request->getFileSize( 'wpUploadFile' );
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$this->mOname = $request->getFileName( 'wpUploadFile' );
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$this->mUploadError = $request->getUploadError( 'wpUploadFile' );
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$this->mSessionKey = false;
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$this->mStashed = false;
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$this->mRemoveTempFile = false; // PHP will handle this
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}
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}
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/**
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* Start doing stuff
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* @access public
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*/
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function execute() {
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global $wgUser, $wgOut;
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global $wgEnableUploads, $wgUploadDirectory;
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/** Show an error message if file upload is disabled */
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if( ! $wgEnableUploads ) {
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$wgOut->addWikiText( wfMsg( 'uploaddisabled' ) );
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return;
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}
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/** Various rights checks */
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if( !$wgUser->isAllowed( 'upload' ) || $wgUser->isBlocked() ) {
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$wgOut->errorpage( 'uploadnologin', 'uploadnologintext' );
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return;
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}
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if( wfReadOnly() ) {
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$wgOut->readOnlyPage();
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return;
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}
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/** Check if the image directory is writeable, this is a common mistake */
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if ( !is_writeable( $wgUploadDirectory ) ) {
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$wgOut->addWikiText( wfMsg( 'upload_directory_read_only', $wgUploadDirectory ) );
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return;
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}
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if( $this->mReUpload ) {
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$this->unsaveUploadedFile();
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$this->mainUploadForm();
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} else if ( 'submit' == $this->mAction || $this->mUpload ) {
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$this->processUpload();
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} else {
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$this->mainUploadForm();
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}
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$this->cleanupTempFile();
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}
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/* -------------------------------------------------------------- */
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/**
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* Really do the upload
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* Checks are made in SpecialUpload::execute()
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* @access private
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*/
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function processUpload() {
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global $wgUser, $wgOut, $wgLang, $wgContLang;
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global $wgUploadDirectory;
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global $wgUseCopyrightUpload, $wgCheckCopyrightUpload;
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/* Check for PHP error if any, requires php 4.2 or newer */
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if ( $this->mUploadError == 1/*UPLOAD_ERR_INI_SIZE*/ ) {
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$this->mainUploadForm( wfMsgHtml( 'largefileserver' ) );
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return;
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}
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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( trim( $this->mOname ) == '' || empty( $this->mUploadSize ) ) {
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$this->mainUploadForm( wfMsgHtml( 'emptyfile' ) );
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return;
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}
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# Chop off any directories in the given filename
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if ( $this->mDestFile ) {
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$basename = basename( $this->mDestFile );
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} else {
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$basename = basename( $this->mOname );
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}
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/**
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* We'll want to blacklist against *any* 'extension', and use
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* only the final one for the whitelist.
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*/
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list( $partname, $ext ) = $this->splitExtensions( $basename );
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if( count( $ext ) ) {
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$finalExt = $ext[count( $ext ) - 1];
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} else {
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$finalExt = '';
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}
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$fullExt = implode( '.', $ext );
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if ( strlen( $partname ) < 3 ) {
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$this->mainUploadForm( wfMsgHtml( 'minlength' ) );
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return;
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}
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/**
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* Filter out illegal characters, and try to make a legible name
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* out of it. We'll strip some silently that Title would die on.
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*/
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$filtered = preg_replace ( "/[^".Title::legalChars()."]|:/", '-', $basename );
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$nt = Title::newFromText( $filtered );
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if( is_null( $nt ) ) {
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$this->uploadError( wfMsgWikiHtml( 'illegalfilename', htmlspecialchars( $filtered ) ) );
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return;
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}
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$nt =& Title::makeTitle( NS_IMAGE, $nt->getDBkey() );
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$this->mUploadSaveName = $nt->getDBkey();
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/**
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* If the image is protected, non-sysop users won't be able
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* to modify it by uploading a new revision.
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*/
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if( !$nt->userCanEdit() ) {
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return $this->uploadError( wfMsgWikiHtml( 'protectedpage' ) );
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}
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/**
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* In some cases we may forbid overwriting of existing files.
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*/
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$overwrite = $this->checkOverwrite( $this->mUploadSaveName );
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if( WikiError::isError( $overwrite ) ) {
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return $this->uploadError( $overwrite->toString() );
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}
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/* Don't allow users to override the blacklist (check file extension) */
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global $wgStrictFileExtensions;
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global $wgFileExtensions, $wgFileBlacklist;
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if( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
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($wgStrictFileExtensions &&
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!$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) ) {
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return $this->uploadError( wfMsgHtml( 'badfiletype', htmlspecialchars( $fullExt ) ) );
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}
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/**
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* Look at the contents of the file; if we can recognize the
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* type but it's corrupt or data of the wrong type, we should
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* probably not accept it.
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*/
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if( !$this->mStashed ) {
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$this->checkMacBinary();
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$veri = $this->verify( $this->mUploadTempName, $finalExt );
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if( $veri !== true ) { //it's a wiki error...
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return $this->uploadError( $veri->toString() );
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}
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}
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/**
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* Provide an opportunity for extensions to add futher checks
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*/
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$error = '';
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if( !wfRunHooks( 'UploadVerification',
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array( $this->mUploadSaveName, $this->mUploadTempName, &$error ) ) ) {
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return $this->uploadError( $error );
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}
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/**
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* Check for non-fatal conditions
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*/
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if ( ! $this->mIgnoreWarning ) {
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$warning = '';
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if( $this->mUploadSaveName != ucfirst( $filtered ) ) {
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$warning .= '<li>'.wfMsgHtml( 'badfilename', htmlspecialchars( $this->mUploadSaveName ) ).'</li>';
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}
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global $wgCheckFileExtensions;
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if ( $wgCheckFileExtensions ) {
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if ( ! $this->checkFileExtension( $finalExt, $wgFileExtensions ) ) {
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$warning .= '<li>'.wfMsgHtml( 'badfiletype', htmlspecialchars( $fullExt ) ).'</li>';
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}
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}
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global $wgUploadSizeWarning;
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if ( $wgUploadSizeWarning && ( $this->mUploadSize > $wgUploadSizeWarning ) ) {
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# TODO: Format $wgUploadSizeWarning to something that looks better than the raw byte
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# value, perhaps add GB,MB and KB suffixes?
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$warning .= '<li>'.wfMsgHtml( 'largefile', $wgUploadSizeWarning, $this->mUploadSize ).'</li>';
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}
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if ( $this->mUploadSize == 0 ) {
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$warning .= '<li>'.wfMsgHtml( 'emptyfile' ).'</li>';
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}
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if( $nt->getArticleID() ) {
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global $wgUser;
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$sk = $wgUser->getSkin();
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$dlink = $sk->makeKnownLinkObj( $nt );
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$warning .= '<li>'.wfMsgHtml( 'fileexists', $dlink ).'</li>';
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}
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if( $warning != '' ) {
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/**
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* Stash the file in a temporary location; the user can choose
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* to let it through and we'll complete the upload then.
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*/
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return $this->uploadWarning( $warning );
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}
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}
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/**
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* Try actually saving the thing...
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* It will show an error form on failure.
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*/
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$hasBeenMunged = !empty( $this->mSessionKey ) || $this->mRemoveTempFile;
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if( $this->saveUploadedFile( $this->mUploadSaveName,
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$this->mUploadTempName,
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$hasBeenMunged ) ) {
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/**
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* Update the upload log and create the description page
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* if it's a new file.
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*/
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$img = Image::newFromName( $this->mUploadSaveName );
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$success = $img->recordUpload( $this->mUploadOldVersion,
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$this->mUploadDescription,
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$this->mLicense,
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$this->mUploadCopyStatus,
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$this->mUploadSource );
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if ( $success ) {
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$this->showSuccess();
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} else {
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// Image::recordUpload() fails if the image went missing, which is
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// unlikely, hence the lack of a specialised message
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$wgOut->fileNotFoundError( $this->mUploadSaveName );
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}
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}
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}
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/**
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* Move the uploaded file from its temporary location to the final
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* destination. If a previous version of the file exists, move
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* it into the archive subdirectory.
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*
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* @todo If the later save fails, we may have disappeared the original file.
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*
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* @param string $saveName
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* @param string $tempName full path to the temporary file
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* @param bool $useRename if true, doesn't check that the source file
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* is a PHP-managed upload temporary
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*/
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function saveUploadedFile( $saveName, $tempName, $useRename = false ) {
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global $wgUploadDirectory, $wgOut;
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$fname= "SpecialUpload::saveUploadedFile";
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$dest = wfImageDir( $saveName );
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$archive = wfImageArchiveDir( $saveName );
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$this->mSavedFile = "{$dest}/{$saveName}";
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if( is_file( $this->mSavedFile ) ) {
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$this->mUploadOldVersion = gmdate( 'YmdHis' ) . "!{$saveName}";
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wfSuppressWarnings();
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$success = rename( $this->mSavedFile, "${archive}/{$this->mUploadOldVersion}" );
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wfRestoreWarnings();
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if( ! $success ) {
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$wgOut->fileRenameError( $this->mSavedFile,
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"${archive}/{$this->mUploadOldVersion}" );
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return false;
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}
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else wfDebug("$fname: moved file ".$this->mSavedFile." to ${archive}/{$this->mUploadOldVersion}\n");
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}
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else {
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$this->mUploadOldVersion = '';
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}
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wfSuppressWarnings();
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$success = $useRename
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? rename( $tempName, $this->mSavedFile )
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: move_uploaded_file( $tempName, $this->mSavedFile );
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wfRestoreWarnings();
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if( ! $success ) {
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$wgOut->fileCopyError( $tempName, $this->mSavedFile );
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return false;
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} else {
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wfDebug("$fname: wrote tempfile $tempName to ".$this->mSavedFile."\n");
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}
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chmod( $this->mSavedFile, 0644 );
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return true;
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}
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/**
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* Stash a file in a temporary directory for later processing
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* after the user has confirmed it.
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*
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* If the user doesn't explicitly cancel or accept, these files
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* can accumulate in the temp directory.
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*
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* @param string $saveName - the destination filename
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* @param string $tempName - the source temporary file to save
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* @return string - full path the stashed file, or false on failure
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* @access private
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*/
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function saveTempUploadedFile( $saveName, $tempName ) {
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global $wgOut;
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$archive = wfImageArchiveDir( $saveName, 'temp' );
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$stash = $archive . '/' . gmdate( "YmdHis" ) . '!' . $saveName;
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$success = $this->mRemoveTempFile
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? rename( $tempName, $stash )
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: move_uploaded_file( $tempName, $stash );
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if ( !$success ) {
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$wgOut->fileCopyError( $tempName, $stash );
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return false;
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}
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return $stash;
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}
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/**
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* Stash a file in a temporary directory for later processing,
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* and save the necessary descriptive info into the session.
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* Returns a key value which will be passed through a form
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* to pick up the path info on a later invocation.
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*
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* @return int
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* @access private
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*/
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function stashSession() {
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$stash = $this->saveTempUploadedFile(
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$this->mUploadSaveName, $this->mUploadTempName );
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if( !$stash ) {
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# Couldn't save the file.
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return false;
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}
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$key = mt_rand( 0, 0x7fffffff );
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$_SESSION['wsUploadData'][$key] = array(
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'mUploadTempName' => $stash,
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'mUploadSize' => $this->mUploadSize,
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'mOname' => $this->mOname );
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return $key;
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}
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/**
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* Remove a temporarily kept file stashed by saveTempUploadedFile().
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* @access private
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*/
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function unsaveUploadedFile() {
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global $wgOut;
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wfSuppressWarnings();
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$success = unlink( $this->mUploadTempName );
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wfRestoreWarnings();
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if ( ! $success ) {
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$wgOut->fileDeleteError( $this->mUploadTempName );
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}
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}
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/* -------------------------------------------------------------- */
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/**
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* Show some text and linkage on successful upload.
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* @access private
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*/
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function showSuccess() {
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global $wgUser, $wgOut, $wgContLang;
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$sk = $wgUser->getSkin();
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$ilink = $sk->makeMediaLink( $this->mUploadSaveName, Image::imageUrl( $this->mUploadSaveName ) );
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$dname = $wgContLang->getNsText( NS_IMAGE ) . ':'.$this->mUploadSaveName;
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$dlink = $sk->makeKnownLink( $dname, $dname );
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$wgOut->addHTML( '<h2>' . wfMsgHtml( 'successfulupload' ) . "</h2>\n" );
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$text = wfMsgWikiHtml( 'fileuploaded', $ilink, $dlink );
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$wgOut->addHTML( $text );
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$wgOut->returnToMain( false );
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}
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/**
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* @param string $error as HTML
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* @access private
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*/
|
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function uploadError( $error ) {
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global $wgOut;
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$wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
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$wgOut->addHTML( "<span class='error'>{$error}</span>\n" );
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}
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/**
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* There's something wrong with this file, not enough to reject it
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* totally but we require manual intervention to save it for real.
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* Stash it away, then present a form asking to confirm or cancel.
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*
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* @param string $warning as HTML
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* @access private
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*/
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function uploadWarning( $warning ) {
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global $wgOut, $wgUser, $wgLang, $wgUploadDirectory, $wgRequest;
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global $wgUseCopyrightUpload;
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$this->mSessionKey = $this->stashSession();
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if( !$this->mSessionKey ) {
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# Couldn't save file; an error has been displayed so let's go.
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return;
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}
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$wgOut->addHTML( "<h2>" . wfMsgHtml( 'uploadwarning' ) . "</h2>\n" );
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$wgOut->addHTML( "<ul class='warning'>{$warning}</ul><br />\n" );
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$save = wfMsgHtml( 'savefile' );
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$reupload = wfMsgHtml( 'reupload' );
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$iw = wfMsgWikiHtml( 'ignorewarning' );
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$reup = wfMsgWikiHtml( 'reuploaddesc' );
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$titleObj = Title::makeTitle( NS_SPECIAL, 'Upload' );
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$action = $titleObj->escapeLocalURL( 'action=submit' );
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if ( $wgUseCopyrightUpload )
|
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{
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$copyright = "
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<input type='hidden' name='wpUploadCopyStatus' value=\"" . htmlspecialchars( $this->mUploadCopyStatus ) . "\" />
|
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<input type='hidden' name='wpUploadSource' value=\"" . htmlspecialchars( $this->mUploadSource ) . "\" />
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";
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} else {
|
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$copyright = "";
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}
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|
|
$wgOut->addHTML( "
|
|
<form id='uploadwarning' method='post' enctype='multipart/form-data' action='$action'>
|
|
<input type='hidden' name='wpIgnoreWarning' value='1' />
|
|
<input type='hidden' name='wpSessionKey' value=\"" . htmlspecialchars( $this->mSessionKey ) . "\" />
|
|
<input type='hidden' name='wpUploadDescription' value=\"" . htmlspecialchars( $this->mUploadDescription ) . "\" />
|
|
<input type='hidden' name='wpLicense' value=\"" . htmlspecialchars( $this->mLicense ) . "\" />
|
|
<input type='hidden' name='wpDestFile' value=\"" . htmlspecialchars( $this->mDestFile ) . "\" />
|
|
{$copyright}
|
|
<table border='0'>
|
|
<tr>
|
|
<tr>
|
|
<td align='right'>
|
|
<input tabindex='2' type='submit' name='wpUpload' value='$save' />
|
|
</td>
|
|
<td align='left'>$iw</td>
|
|
</tr>
|
|
<tr>
|
|
<td align='right'>
|
|
<input tabindex='2' type='submit' name='wpReUpload' value='{$reupload}' />
|
|
</td>
|
|
<td align='left'>$reup</td>
|
|
</tr>
|
|
</tr>
|
|
</table></form>\n" );
|
|
}
|
|
|
|
/**
|
|
* Displays the main upload form, optionally with a highlighted
|
|
* error message up at the top.
|
|
*
|
|
* @param string $msg as HTML
|
|
* @access private
|
|
*/
|
|
function mainUploadForm( $msg='' ) {
|
|
global $wgOut, $wgUser, $wgLang, $wgUploadDirectory, $wgRequest;
|
|
global $wgUseCopyrightUpload;
|
|
|
|
$cols = intval($wgUser->getOption( 'cols' ));
|
|
$ew = $wgUser->getOption( 'editwidth' );
|
|
if ( $ew ) $ew = " style=\"width:100%\"";
|
|
else $ew = '';
|
|
|
|
if ( '' != $msg ) {
|
|
$sub = wfMsgHtml( 'uploaderror' );
|
|
$wgOut->addHTML( "<h2>{$sub}</h2>\n" .
|
|
"<span class='error'>{$msg}</span>\n" );
|
|
}
|
|
$wgOut->addWikiText( wfMsg( 'uploadtext' ) );
|
|
$sk = $wgUser->getSkin();
|
|
|
|
|
|
$sourcefilename = wfMsgHtml( 'sourcefilename' );
|
|
$destfilename = wfMsgHtml( 'destfilename' );
|
|
$summary = wfMsgWikiHtml( 'fileuploadsummary' );
|
|
|
|
$licenses = new Licenses();
|
|
$license = wfMsgHtml( 'license' );
|
|
$nolicense = wfMsgHtml( 'nolicense' );
|
|
$licenseshtml = $licenses->getHtml();
|
|
|
|
$ulb = wfMsgHtml( 'uploadbtn' );
|
|
|
|
|
|
$titleObj = Title::makeTitle( NS_SPECIAL, 'Upload' );
|
|
$action = $titleObj->escapeLocalURL();
|
|
|
|
$encDestFile = htmlspecialchars( $this->mDestFile );
|
|
$source = null;
|
|
|
|
if ( $wgUseCopyrightUpload )
|
|
{
|
|
$source = "
|
|
<td align='right' nowrap='nowrap'>" . wfMsg ( 'filestatus' ) . ":</td>
|
|
<td><input tabindex='3' type='text' name=\"wpUploadCopyStatus\" value=\"" .
|
|
htmlspecialchars($this->mUploadCopyStatus). "\" size='40' /></td>
|
|
</tr><tr>
|
|
<td align='right'>". wfMsg ( 'filesource' ) . ":</td>
|
|
<td><input tabindex='4' type='text' name='wpUploadSource' value=\"" .
|
|
htmlspecialchars($this->mUploadSource). "\" size='40' /></td>
|
|
" ;
|
|
}
|
|
|
|
$wgOut->addHTML( "
|
|
<form id='upload' method='post' enctype='multipart/form-data' action=\"$action\">
|
|
<table border='0'><tr>
|
|
|
|
<td align='right'>{$sourcefilename}:</td><td align='left'>
|
|
<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' " . ($this->mDestFile?"":"onchange='fillDestFilename()' ") . "size='40' />
|
|
</td></tr><tr>
|
|
|
|
<td align='right'>{$destfilename}:</td><td align='left'>
|
|
<input tabindex='1' type='text' name='wpDestFile' id='wpDestFile' size='40' value=\"$encDestFile\" />
|
|
</td></tr><tr>
|
|
|
|
<td align='right'>{$summary}</td><td align='left'>
|
|
<textarea tabindex='2' name='wpUploadDescription' rows='6' cols='{$cols}'{$ew}>"
|
|
. htmlspecialchars( $this->mUploadDescription ) .
|
|
"</textarea>
|
|
</td></tr><tr>" );
|
|
|
|
if ( $licenseshtml != '' ) {
|
|
$wgOut->addHTML( "
|
|
<td align='right'>$license:</td>
|
|
<td align='left'>
|
|
<select name='wpLicense'>
|
|
<option value=''>$nolicense</option>
|
|
$licenseshtml
|
|
</select>
|
|
</td></tr><tr>
|
|
");
|
|
}
|
|
$wgOut->addHtml( "{$source}
|
|
</tr>
|
|
<tr><td></td><td align='left'>
|
|
<input tabindex='5' type='submit' name='wpUpload' value=\"{$ulb}\" />
|
|
</td></tr></table></form>\n" );
|
|
}
|
|
|
|
/* -------------------------------------------------------------- */
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* @return array
|
|
*/
|
|
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 string $ext
|
|
* @param array $list
|
|
* @return bool
|
|
*/
|
|
function checkFileExtension( $ext, $list ) {
|
|
return in_array( strtolower( $ext ), $list );
|
|
}
|
|
|
|
/**
|
|
* Perform case-insensitive match against a list of file extensions.
|
|
* Returns true if any of the extensions are in the list.
|
|
*
|
|
* @param array $ext
|
|
* @param array $list
|
|
* @return bool
|
|
*/
|
|
function checkFileExtensionList( $ext, $list ) {
|
|
foreach( $ext as $e ) {
|
|
if( in_array( strtolower( $e ), $list ) ) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Verifies that it's ok to include the uploaded file
|
|
*
|
|
* @param string $tmpfile the full path of the temporary file to verify
|
|
* @param string $extension The filename extension that the file is to be served with
|
|
* @return mixed true of the file is verified, a WikiError object otherwise.
|
|
*/
|
|
function verify( $tmpfile, $extension ) {
|
|
#magically determine mime type
|
|
$magic=& wfGetMimeMagic();
|
|
$mime= $magic->guessMimeType($tmpfile,false);
|
|
|
|
$fname= "SpecialUpload::verify";
|
|
|
|
#check mime type, if desired
|
|
global $wgVerifyMimeType;
|
|
if ($wgVerifyMimeType) {
|
|
|
|
#check mime type against file extension
|
|
if( !$this->verifyExtension( $mime, $extension ) ) {
|
|
return new WikiErrorMsg( 'uploadcorrupt' );
|
|
}
|
|
|
|
#check mime type blacklist
|
|
global $wgMimeTypeBlacklist;
|
|
if( isset($wgMimeTypeBlacklist) && !is_null($wgMimeTypeBlacklist)
|
|
&& $this->checkFileExtension( $mime, $wgMimeTypeBlacklist ) ) {
|
|
return new WikiErrorMsg( 'badfiletype', htmlspecialchars( $mime ) );
|
|
}
|
|
}
|
|
|
|
#check for htmlish code and javascript
|
|
if( $this->detectScript ( $tmpfile, $mime ) ) {
|
|
return new WikiErrorMsg( 'uploadscripted' );
|
|
}
|
|
|
|
/**
|
|
* Scan the uploaded file for viruses
|
|
*/
|
|
$virus= $this->detectVirus($tmpfile);
|
|
if ( $virus ) {
|
|
return new WikiErrorMsg( 'uploadvirus', htmlspecialchars($virus) );
|
|
}
|
|
|
|
wfDebug( "$fname: all clear; passing.\n" );
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* 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 bool
|
|
*/
|
|
function verifyExtension( $mime, $extension ) {
|
|
$fname = 'SpecialUpload::verifyExtension';
|
|
|
|
if (!$mime || $mime=="unknown" || $mime=="unknown/unknown") {
|
|
wfDebug( "$fname: passing file with unknown mime type\n" );
|
|
return true;
|
|
}
|
|
|
|
$magic=& wfGetMimeMagic();
|
|
|
|
$match= $magic->isMatchingExtension($extension,$mime);
|
|
|
|
if ($match===NULL) {
|
|
wfDebug( "$fname: no file extension known for mime type $mime, passing file\n" );
|
|
return true;
|
|
} elseif ($match===true) {
|
|
wfDebug( "$fname: mime type $mime matches extension $extension, passing file\n" );
|
|
|
|
#TODO: if it's a bitmap, make sure PHP or ImageMagic resp. can handle it!
|
|
return true;
|
|
|
|
} else {
|
|
wfDebug( "$fname: mime type $mime mismatches file extension $extension, rejecting file\n" );
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/** Heuristig 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 $mime The mime type of the file
|
|
* @return bool true if the file contains something looking like embedded scripts
|
|
*/
|
|
function detectScript($file,$mime) {
|
|
|
|
#ugly hack: for text files, always look at the entire file.
|
|
#For binarie field, just check the first K.
|
|
|
|
if (strpos($mime,'text/')===0) $chunk = file_get_contents( $file );
|
|
else {
|
|
$fp = fopen( $file, 'rb' );
|
|
$chunk = fread( $fp, 1024 );
|
|
fclose( $fp );
|
|
}
|
|
|
|
$chunk= strtolower( $chunk );
|
|
|
|
if (!$chunk) 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);
|
|
|
|
#FIXME: convert from UTF-16 if necessarry!
|
|
|
|
wfDebug("SpecialUpload::detectScript: checking for embedded scripts and HTML stuff\n");
|
|
|
|
#check for HTML doctype
|
|
if (eregi("<!DOCTYPE *X?HTML",$chunk)) 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(
|
|
'<body',
|
|
'<head',
|
|
'<html', #also in safari
|
|
'<img',
|
|
'<pre',
|
|
'<script', #also in safari
|
|
'<table',
|
|
'<title' #also in safari
|
|
);
|
|
|
|
foreach( $tags as $tag ) {
|
|
if( false !== strpos( $chunk, $tag ) ) {
|
|
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)) return true;
|
|
|
|
#look for html-style script-urls
|
|
if (preg_match("!(href|src|data)\s*=\s*['\"]?\s*(ecma|java)script:!sim",$chunk)) return true;
|
|
|
|
#look for css-style script-urls
|
|
if (preg_match("!url\s*\(\s*['\"]?\s*(ecma|java)script:!sim",$chunk)) return true;
|
|
|
|
wfDebug("SpecialUpload::detectScript: no scripts found\n");
|
|
return false;
|
|
}
|
|
|
|
/** 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 $file Pathname to the temporary upload file
|
|
* @return mixed false if not virus is found, NULL if the scan fails or is disabled,
|
|
* or a string containing feedback from the virus scanner if a virus was found.
|
|
* If textual feedback is missing but a virus was found, this function returns true.
|
|
*/
|
|
function detectVirus($file) {
|
|
global $wgAntivirus, $wgAntivirusSetup, $wgAntivirusRequired;
|
|
|
|
$fname= "SpecialUpload::detectVirus";
|
|
|
|
if (!$wgAntivirus) { #disabled?
|
|
wfDebug("$fname: virus scanner disabled\n");
|
|
|
|
return NULL;
|
|
}
|
|
|
|
if (!$wgAntivirusSetup[$wgAntivirus]) {
|
|
wfDebug("$fname: unknown virus scanner: $wgAntivirus\n");
|
|
|
|
$wgOut->addHTML( "<div class='error'>Bad configuration: unknown virus scanner: <i>$wgAntivirus</i></div>\n" ); #LOCALIZE
|
|
|
|
return "unknown antivirus: $wgAntivirus";
|
|
}
|
|
|
|
#look up scanner configuration
|
|
$virus_scanner= $wgAntivirusSetup[$wgAntivirus]["command"]; #command pattern
|
|
$virus_scanner_codes= $wgAntivirusSetup[$wgAntivirus]["codemap"]; #exit-code map
|
|
$msg_pattern= $wgAntivirusSetup[$wgAntivirus]["messagepattern"]; #message pattern
|
|
|
|
$scanner= $virus_scanner; #copy, so we can resolve the pattern
|
|
|
|
if (strpos($scanner,"%f")===false) $scanner.= " ".wfEscapeShellArg($file); #simple pattern: append file to scan
|
|
else $scanner= str_replace("%f",wfEscapeShellArg($file),$scanner); #complex pattern: replace "%f" with file to scan
|
|
|
|
wfDebug("$fname: running virus scan: $scanner \n");
|
|
|
|
#execute virus scanner
|
|
$code= false;
|
|
|
|
#NOTE: there's a 50 line workaround to make stderr redirection work on windows, too.
|
|
# that does not seem to be worth the pain.
|
|
# Ask me (Duesentrieb) about it if it's ever needed.
|
|
if (wfIsWindows()) exec("$scanner",$output,$code);
|
|
else exec("$scanner 2>&1",$output,$code);
|
|
|
|
$exit_code= $code; #remeber for user feedback
|
|
|
|
if ($virus_scanner_codes) { #map exit code to AV_xxx constants.
|
|
if (isset($virus_scanner_codes[$code])) $code= $virus_scanner_codes[$code]; #explicite mapping
|
|
else if (isset($virus_scanner_codes["*"])) $code= $virus_scanner_codes["*"]; #fallback mapping
|
|
}
|
|
|
|
if ($code===AV_SCAN_FAILED) { #scan failed (code was mapped to false by $virus_scanner_codes)
|
|
wfDebug("$fname: failed to scan $file (code $exit_code).\n");
|
|
|
|
if ($wgAntivirusRequired) return "scan failed (code $exit_code)";
|
|
else return NULL;
|
|
}
|
|
else if ($code===AV_SCAN_ABORTED) { #scan failed because filetype is unknown (probably imune)
|
|
wfDebug("$fname: unsupported file type $file (code $exit_code).\n");
|
|
return NULL;
|
|
}
|
|
else if ($code===AV_NO_VIRUS) {
|
|
wfDebug("$fname: file passed virus scan.\n");
|
|
return false; #no virus found
|
|
}
|
|
else {
|
|
$output= join("\n",$output);
|
|
$output= trim($output);
|
|
|
|
if (!$output) $output= true; #if ther's no output, return true
|
|
else if ($msg_pattern) {
|
|
$groups= array();
|
|
if (preg_match($msg_pattern,$output,$groups)) {
|
|
if ($groups[1]) $output= $groups[1];
|
|
}
|
|
}
|
|
|
|
wfDebug("$fname: FOUND VIRUS! scanner feedback: $output");
|
|
return $output;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if the temporary file is MacBinary-encoded, as some uploads
|
|
* from Internet Explorer on Mac OS Classic and Mac OS X will be.
|
|
* If so, the data fork will be extracted to a second temporary file,
|
|
* which will then be checked for validity and either kept or discarded.
|
|
*
|
|
* @access private
|
|
*/
|
|
function checkMacBinary() {
|
|
$macbin = new MacBinary( $this->mUploadTempName );
|
|
if( $macbin->isValid() ) {
|
|
$dataFile = tempnam( wfTempDir(), "WikiMacBinary" );
|
|
$dataHandle = fopen( $dataFile, 'wb' );
|
|
|
|
wfDebug( "SpecialUpload::checkMacBinary: Extracting MacBinary data fork to $dataFile\n" );
|
|
$macbin->extractData( $dataHandle );
|
|
|
|
$this->mUploadTempName = $dataFile;
|
|
$this->mUploadSize = $macbin->dataForkLength();
|
|
|
|
// We'll have to manually remove the new file if it's not kept.
|
|
$this->mRemoveTempFile = true;
|
|
}
|
|
$macbin->close();
|
|
}
|
|
|
|
/**
|
|
* If we've modified the upload file we need to manually remove it
|
|
* on exit to clean up.
|
|
* @access private
|
|
*/
|
|
function cleanupTempFile() {
|
|
if( $this->mRemoveTempFile && file_exists( $this->mUploadTempName ) ) {
|
|
wfDebug( "SpecialUpload::cleanupTempFile: Removing temporary file $this->mUploadTempName\n" );
|
|
unlink( $this->mUploadTempName );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if there's an overwrite conflict and, if so, if restrictions
|
|
* forbid this user from performing the upload.
|
|
*
|
|
* @return mixed true on success, WikiError on failure
|
|
* @access private
|
|
*/
|
|
function checkOverwrite( $name ) {
|
|
$img = Image::newFromName( $name );
|
|
if( is_null( $img ) ) {
|
|
// Uh... this shouldn't happen ;)
|
|
// But if it does, fall through to previous behavior
|
|
return false;
|
|
}
|
|
|
|
$error = '';
|
|
if( $img->exists() ) {
|
|
global $wgUser, $wgOut;
|
|
if( $img->isLocal() ) {
|
|
if( !$wgUser->isAllowed( 'reupload' ) ) {
|
|
$error = 'fileexists-forbidden';
|
|
}
|
|
} else {
|
|
if( !$wgUser->isAllowed( 'reupload' ) ||
|
|
!$wgUser->isAllowed( 'reupload-shared' ) ) {
|
|
$error = "fileexists-shared-forbidden";
|
|
}
|
|
}
|
|
}
|
|
|
|
if( $error ) {
|
|
$errorText = wfMsg( $error, wfEscapeWikiText( $img->getName() ) );
|
|
return new WikiError( $wgOut->parse( $errorText ) );
|
|
}
|
|
|
|
// Rockin', go ahead and upload
|
|
return true;
|
|
}
|
|
|
|
}
|
|
?>
|