694 lines
20 KiB
PHP
694 lines
20 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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/**
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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 $mUploadAffirm, $mUploadFile, $mUploadDescription, $mIgnoreWarning;
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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;
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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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if( !$request->wasPosted() ) {
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# GET requests just give the main form; no data.
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return;
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}
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$this->mUploadAffirm = $request->getCheck( 'wpUploadAffirm' );
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$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->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 = $data['mOname'];
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} else {
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/**
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*Check for a newly uploaded file.
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*/
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$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->mSessionKey = false;
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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 $wgDisableUploads;
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/** Show an error message if file upload is disabled */
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if( $wgDisableUploads ) {
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$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->getID() == 0 )
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OR $wgUser->isBlocked() ) {
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$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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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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}
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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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/**
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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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return $this->mainUploadForm('<li>'.wfMsg( 'emptyfile' ).'</li>');
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}
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/**
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* When using detailed copyright, if user filled field, assume he
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* confirmed the upload
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*/
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if ( $wgUseCopyrightUpload ) {
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$this->mUploadAffirm = true;
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if( $wgCheckCopyrightUpload &&
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( trim( $this->mUploadCopyStatus ) == '' ||
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trim( $this->mUploadSource ) == '' ) ) {
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$this->mUploadAffirm = false;
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}
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}
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/** User need to confirm his upload */
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if( !$this->mUploadAffirm ) {
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$this->mainUploadForm( wfMsg( 'noaffirmation' ) );
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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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$basename = basename( $this->mOname );
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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( wfMsg( '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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return $this->uploadError( wfMsg( 'illegalfilename', htmlspecialchars( $filtered ) ) );
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}
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$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( wfMsg( 'protectedpage' ) );
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}
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/* Don't allow users to override the blacklist */
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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( wfMsg( '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->verify( $this->mUploadTempName, $finalExt ) ) {
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return $this->uploadError( wfMsg( 'uploadcorrupt' ) );
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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>'.wfMsg( '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>'.wfMsg( '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 > $wgUploadSizeWarning ) ) {
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$warning .= '<li>'.wfMsg( 'largefile' ).'</li>';
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}
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if ( $this->mUploadSize == 0 ) {
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$warning .= '<li>'.wfMsg( '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>'.wfMsg( '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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if( $this->saveUploadedFile( $this->mUploadSaveName,
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$this->mUploadTempName,
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!empty( $this->mSessionKey ) ) ) {
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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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wfRecordUpload( $this->mUploadSaveName,
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$this->mUploadOldVersion,
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$this->mUploadSize,
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$this->mUploadDescription,
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$this->mUploadCopyStatus,
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$this->mUploadSource );
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$this->showSuccess();
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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, $wgOut;
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$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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if( !rename( $this->mSavedFile, "${archive}/{$this->mUploadOldVersion}" ) ) {
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$wgOut->fileRenameError( $this->mSavedFile,
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"${archive}/{$this->mUploadOldVersion}" );
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return false;
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}
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} else {
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$this->mUploadOldVersion = '';
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}
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if( $useRename ) {
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if( !rename( $tempName, $this->mSavedFile ) ) {
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$wgOut->fileCopyError( $tempName, $this->mSavedFile );
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return false;
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}
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} else {
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if( !move_uploaded_file( $tempName, $this->mSavedFile ) ) {
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$wgOut->fileCopyError( $tempName, $this->mSavedFile );
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return false;
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}
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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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if ( !move_uploaded_file( $tempName, $stash ) ) {
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$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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if ( ! @unlink( $this->mUploadTempName ) ) {
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$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::wfImageUrl( $this->mUploadSaveName ) );
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$dname = $wgContLang->getNsText( Namespace::getImage() ) . ':'.$this->mUploadSaveName;
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$dlink = $sk->makeKnownLink( $dname, $dname );
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$wgOut->addHTML( '<h2>' . wfMsg( 'successfulupload' ) . "</h2>\n" );
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$text = wfMsg( 'fileuploaded', $ilink, $dlink );
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$wgOut->addHTML( '<p>'.$text."\n" );
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$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 $wgOut;
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$sub = wfMsg( 'uploadwarning' );
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$wgOut->addHTML( "<h2>{$sub}</h2>\n" );
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$wgOut->addHTML( "<h4 class='error'>{$error}</h4>\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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$sub = wfMsg( 'uploadwarning' );
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$wgOut->addHTML( "<h2>{$sub}</h2>\n" );
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$wgOut->addHTML( "<ul class='warning'>{$warning}</ul><br/>\n" );
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$save = wfMsg( 'savefile' );
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$reupload = wfMsg( 'reupload' );
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$iw = wfMsg( 'ignorewarning' );
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$reup = wfMsg( 'reuploaddesc' );
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$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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$wgOut->addHTML( "
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<form id=\"uploadwarning\" method=\"post\" enctype=\"multipart/form-data\"
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action=\"{$action}\">
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<input type=hidden name=\"wpUploadAffirm\" value=\"1\" />
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<input type=hidden name=\"wpIgnoreWarning\" value=\"1\" />
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<input type=hidden name=\"wpSessionKey\" value=\"" . htmlspecialchars( $this->mSessionKey ) . "\" />
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<input type=hidden name=\"wpUploadDescription\" value=\"" . htmlspecialchars( $this->mUploadDescription ) . "\" />
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{$copyright}
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<table border='0'><tr>
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<tr><td align='right'>
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<input tabindex='2' type='submit' name=\"wpUpload\" value=\"{$save}\" />
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</td><td align='left'>{$iw}</td></tr>
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<tr><td align='right'>
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<input tabindex='2' type='submit' name=\"wpReUpload\" value=\"{$reupload}\" />
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</td><td align='left'>{$reup}</td></tr></table></form>\n" );
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}
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/**
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* Displays the main upload form, optionally with a highlighted
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* error message up at the top.
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*
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* @param string $msg as HTML
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* @access private
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*/
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function mainUploadForm( $msg='' ) {
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global $wgOut, $wgUser, $wgLang, $wgUploadDirectory, $wgRequest;
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global $wgUseCopyrightUpload;
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if ( '' != $msg ) {
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$sub = wfMsg( 'uploaderror' );
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$wgOut->addHTML( "<h2>{$sub}</h2>\n" .
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"<h4 class='error'>{$msg}</h4>\n" );
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} else {
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$sub = wfMsg( 'uploadfile' );
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$wgOut->addHTML( "<h2>{$sub}</h2>\n" );
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}
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$wgOut->addWikiText( wfMsg( 'uploadtext' ) );
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$sk = $wgUser->getSkin();
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$fn = wfMsg( 'filename' );
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$fd = wfMsg( 'filedesc' );
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$ulb = wfMsg( 'uploadbtn' );
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$clink = $sk->makeKnownLink( wfMsgForContent( 'copyrightpage' ),
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wfMsg( 'copyrightpagename' ) );
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$ca = wfMsg( 'affirmation', $clink );
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$iw = wfMsg( 'ignorewarning' );
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$titleObj = Title::makeTitle( NS_SPECIAL, 'Upload' );
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$action = $titleObj->escapeLocalURL();
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$source = "
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<td align='right'>
|
|
<input tabindex='3' type='checkbox' name=\"wpUploadAffirm\" value=\"1\" id=\"wpUploadAffirm\" />
|
|
</td><td align='left'><label for=\"wpUploadAffirm\">{$ca}</label></td>
|
|
" ;
|
|
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'>{$fn}:</td><td align='left'>
|
|
<input tabindex='1' type='file' name=\"wpUploadFile\" size='40' />
|
|
</td></tr><tr>
|
|
<td align='right'>{$fd}:</td><td align='left'>
|
|
<input tabindex='2' type='text' name=\"wpUploadDescription\" value=\""
|
|
. htmlspecialchars( $this->mUploadDescription ) . "\" size='40' />
|
|
</td></tr><tr>
|
|
{$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;
|
|
}
|
|
|
|
/**
|
|
* Returns false if the file is of a known type but can't be recognized,
|
|
* indicating a corrupt file.
|
|
* Returns true otherwise; unknown file types are not checked if given
|
|
* with an unrecognized extension.
|
|
*
|
|
* @param string $tmpfile Pathname to the temporary upload file
|
|
* @param string $extension The filename extension that the file is to be served with
|
|
* @return bool
|
|
*/
|
|
function verify( $tmpfile, $extension ) {
|
|
if( $this->triggersIEbug( $tmpfile ) ) {
|
|
return false;
|
|
}
|
|
|
|
$fname = 'SpecialUpload::verify';
|
|
$mergeExtensions = array(
|
|
'jpg' => 'jpeg',
|
|
'tif' => 'tiff' );
|
|
$extensionTypes = array(
|
|
# See http://www.php.net/getimagesize
|
|
1 => 'gif',
|
|
2 => 'jpeg',
|
|
3 => 'png',
|
|
4 => 'swf',
|
|
5 => 'psd',
|
|
6 => 'bmp',
|
|
7 => 'tiff',
|
|
8 => 'tiff',
|
|
9 => 'jpc',
|
|
10 => 'jp2',
|
|
11 => 'jpx',
|
|
12 => 'jb2',
|
|
13 => 'swc',
|
|
14 => 'iff',
|
|
15 => 'wbmp',
|
|
16 => 'xbm' );
|
|
|
|
$extension = strtolower( $extension );
|
|
if( isset( $mergeExtensions[$extension] ) ) {
|
|
$extension = $mergeExtensions[$extension];
|
|
}
|
|
wfDebug( "$fname: Testing file '$tmpfile' with given extension '$extension'\n" );
|
|
|
|
if( !in_array( $extension, $extensionTypes ) ) {
|
|
# Not a recognized image type. We don't know how to verify these.
|
|
# They're allowed by policy or they wouldn't get this far, so we'll
|
|
# let them slide for now.
|
|
wfDebug( "$fname: Unknown extension; passing.\n" );
|
|
return true;
|
|
}
|
|
|
|
$data = @getimagesize( $tmpfile );
|
|
if( false === $data ) {
|
|
# Didn't recognize the image type.
|
|
# Either the image is corrupt or someone's slipping us some
|
|
# bogus data such as HTML+JavaScript trying to take advantage
|
|
# of an Internet Explorer security flaw.
|
|
wfDebug( "$fname: getimagesize() doesn't recognize the file; rejecting.\n" );
|
|
return false;
|
|
}
|
|
|
|
$imageType = $data[2];
|
|
if( !isset( $extensionTypes[$imageType] ) ) {
|
|
# Now we're kind of confused. Perhaps new image types added
|
|
# to PHP's support that we don't know about.
|
|
# We'll let these slide for now.
|
|
wfDebug( "$fname: getimagesize() knows the file, but we don't recognize the type; passing.\n" );
|
|
return true;
|
|
}
|
|
|
|
$ext = strtolower( $extension );
|
|
if( $extension != $extensionTypes[$imageType] ) {
|
|
# The given filename extension doesn't match the
|
|
# file type. Probably just a mistake, but it's a stupid
|
|
# one and we shouldn't let it pass. KILL THEM!
|
|
wfDebug( "$fname: file extension does not match recognized type; rejecting.\n" );
|
|
return false;
|
|
}
|
|
|
|
wfDebug( "$fname: all clear; passing.\n" );
|
|
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.
|
|
*
|
|
* Returns true if IE is likely to mistake the given file for HTML.
|
|
*
|
|
* @param string $filename
|
|
* @return bool
|
|
*/
|
|
function triggersIEbug( $filename ) {
|
|
$file = fopen( $filename, 'rb' );
|
|
$chunk = strtolower( fread( $file, 200 ) );
|
|
fclose( $file );
|
|
|
|
$tags = array( '<html', '<head', '<body', '<script' );
|
|
foreach( $tags as $tag ) {
|
|
if( false !== strpos( $chunk, $tag ) ) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
}
|
|
?>
|