« Utilisateur:Lea/mw-insertnewimage » : différence entre les versions
mAucun résumé des modifications |
m (→Usage) |
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| Ligne 1 : | Ligne 1 : | ||
= Usage = | = Usage = | ||
Copier le script dans <code>$MEDIAWIKI_ROOT/maintenance/</code>, modifier un | [[Catégorie:Script PHP]] | ||
Copier le script dans <code>$MEDIAWIKI_ROOT/maintenance/</code>, modifier un peu le script, par exemple pour lui donner un nom d'utilisateur adapté, etc ... Puis, | |||
<code multi> | <code multi> | ||
cd $MEDIAWIKI_ROOT/maintenance/ | cd $MEDIAWIKI_ROOT/maintenance/ | ||
| Ligne 6 : | Ligne 7 : | ||
</code> | </code> | ||
pour insérer une image portant le nom du fichier et la copier au bon endroit dans l'arborescence du wiki. | pour insérer une image portant le nom du fichier et la copier au bon endroit dans l'arborescence du wiki. | ||
= Code = | = Code = | ||
<code multi> | <code multi> | ||
Dernière version du 16 octobre 2005 à 17:52
Usage
Copier le script dans $MEDIAWIKI_ROOT/maintenance/, modifier un peu le script, par exemple pour lui donner un nom d'utilisateur adapté, etc ... Puis,
cd $MEDIAWIKI_ROOT/maintenance/
php <nom du script> <chemin relatif vers le fichier>.wiki
pour insérer une image portant le nom du fichier et la copier au bon endroit dans l'arborescence du wiki.
Code
- !/usr/bin/php
<?
define("MW_PATH", "../") ;
$working_dir = getcwd() ;
chdir(MW_PATH) ;
define("MEDIAWIKI", true) ;
require_once( 'includes/Defines.php' );
require_once ("./LocalSettings.php") ;
require_once ("includes/Setup.php") ;
$wgUser = User::newFromName( "Lea" ) ;
if (!$wgUser->isAllowed("edit")) {
echo "Lea can't edit\n" ;
exit ;
}
require_once ("maintenance/SpecialUpload-FAKE.php") ;
// trompons mw
$_SERVER['REQUEST_METHOD'] = 'POST';
for($i = 1 ; $i < $argc ; $i++) {
$filename = $argv[$i] ;
echo "Fichier [$filename] : " ;
$_REQUEST["wpDestFile"] = "$filename" ;
$_REQUEST["wpUpload"] = "upload" ;
$_REQUEST["wpUploadDescription"] = "importé depuis Léa pré-wiki" ;
$_REQUEST["wpUploadSource"] = "$filename" ;
$_FILES["wpUploadFile"]['tmp_name'] = $filename ;
$_FILES["wpUploadFile"]['size'] = "12" ;
$_FILES["wpUploadFile"]['name'] = $filename ;
$request = new WebRequest();
$uploadform = new UploadForm($request) ;
$uploadform->processUpload() ;
echo " [done]\n" ;
}
//echo $wgOut->output() ;
foreach ( $wgDeferredUpdateList as $key => $up ) {
$up->doUpdate();
}
$wgLoadBalancer->commitAll();
$wgLoadBalancer->closeAll();
?>
et SpecialUpload-FAKE.php (dérivé directement du code de mediawiki pour fonctionner dans le cadre du script précédant) :
<?php
/**
*
* @package MediaWiki
* @subpackage SpecialPage
*/
/**
*
*/
require_once( 'Image.php' );
/**
* Entry point
*/
function wfSpecialUpload() {
global $wgRequest;
$form = new UploadForm( $wgRequest );
$form->execute();
}
/**
*
* @package MediaWiki
* @subpackage SpecialPage
*/
class UploadForm {
/**#@+
* @access private
*/
var $mUploadFile, $mUploadDescription, $mIgnoreWarning;
var $mUploadSaveName, $mUploadTempName, $mUploadSize, $mUploadOldVersion;
var $mUploadCopyStatus, $mUploadSource, $mReUpload, $mAction, $mUpload;
var $mOname, $mSessionKey, $mStashed, $mDestFile;
/**#@-*/
/**
* Constructor : initialise object
* Get data POSTed through the form and assign them to the object
* @param $request Data posted.
*/
function UploadForm( &$request ) {
$this->mDestFile = $request->getText( 'wpDestFile' );
if( !$request->wasPosted() ) {
# GET requests just give the main form; no data except wpDestfile.
return;
}
$this->mIgnoreWarning = $request->getCheck( 'wpIgnoreWarning');
$this->mReUpload = $request->getCheck( 'wpReUpload' );
$this->mUpload = $request->getCheck( 'wpUpload' );
$this->mUploadDescription = $request->getText( 'wpUploadDescription' );
$this->mUploadCopyStatus = $request->getText( 'wpUploadCopyStatus' );
$this->mUploadSource = $request->getText( 'wpUploadSource');
$this->mAction = $request->getVal( 'action' );
$this->mSessionKey = $request->getInt( 'wpSessionKey' );
if( !empty( $this->mSessionKey ) &&
isset( $_SESSION['wsUploadData'][$this->mSessionKey] ) ) {
/**
* Confirming a temporarily stashed upload.
* We don't want path names to be forged, so we keep
* them in the session on the server and just give
* an opaque key to the user agent.
*/
$data = $_SESSION['wsUploadData'][$this->mSessionKey];
$this->mUploadTempName = $data['mUploadTempName'];
$this->mUploadSize = $data['mUploadSize'];
$this->mOname = $data['mOname'];
$this->mStashed = true;
} else {
/**
*Check for a newly uploaded file.
*/
$this->mUploadTempName = $request->getFileTempName( 'wpUploadFile' );
$this->mUploadSize = $request->getFileSize( 'wpUploadFile' );
$this->mOname = $request->getFileName( 'wpUploadFile' );
$this->mSessionKey = false;
$this->mStashed = false;
}
}
/**
* Start doing stuff
* @access public
*/
function execute() {
global $wgUser, $wgOut;
global $wgEnableUploads, $wgUploadDirectory;
/** Show an error message if file upload is disabled */
if( ! $wgEnableUploads ) {
$wgOut->addWikiText( wfMsg( 'uploaddisabled' ) );
return;
}
/** Various rights checks */
if( !$wgUser->isAllowed( 'upload' ) || $wgUser->isBlocked() ) {
$wgOut->errorpage( 'uploadnologin', 'uploadnologintext' );
return;
}
if( wfReadOnly() ) {
$wgOut->readOnlyPage();
return;
}
/** Check if the image directory is writeable, this is a common mistake */
if ( !is_writeable( $wgUploadDirectory ) ) {
$wgOut->addWikiText( wfMsg( 'upload_directory_read_only', $wgUploadDirectory ) );
return;
}
if( $this->mReUpload ) {
$this->unsaveUploadedFile();
$this->mainUploadForm();
} else if ( 'submit' == $this->mAction || $this->mUpload ) {
$this->processUpload();
} else {
$this->mainUploadForm();
}
}
/* -------------------------------------------------------------- */
/**
* Really do the upload
* Checks are made in SpecialUpload::execute()
* @access private
*/
function processUpload() {
global $wgUser, $wgOut, $wgLang, $wgContLang;
global $wgUploadDirectory;
global $wgUseCopyrightUpload, $wgCheckCopyrightUpload;
/**
* If there was no filename or a zero size given, give up quick.
*/
if( trim( $this->mOname ) == || empty( $this->mUploadSize ) ) {
return $this->mainUploadForm('
'.wfMsg( 'emptyfile' ).' ');
}
# Chop off any directories in the given filename
if ( $this->mDestFile ) {
$basename = basename( $this->mDestFile );
} else {
$basename = basename( $this->mOname );
}
/**
* We'll want to blacklist against *any* 'extension', and use
* only the final one for the whitelist.
*/
list( $partname, $ext ) = $this->splitExtensions( $basename );
if( count( $ext ) ) {
$finalExt = $ext[count( $ext ) - 1];
} else {
$finalExt = ;
}
$fullExt = implode( '.', $ext );
if ( strlen( $partname ) < 3 ) {
$this->mainUploadForm( wfMsg( 'minlength' ) );
return;
}
/**
* Filter out illegal characters, and try to make a legible name
* out of it. We'll strip some silently that Title would die on.
*/
$filtered = preg_replace ( "/[^".Title::legalChars()."]|:/", '-', $basename );
$nt = Title::newFromText( $filtered );
if( is_null( $nt ) ) {
return $this->uploadError( wfMsg( 'illegalfilename', htmlspecialchars( $filtered ) ) );
}
$nt =& Title::makeTitle( NS_IMAGE, $nt->getDBkey() );
$this->mUploadSaveName = $nt->getDBkey();
/**
* If the image is protected, non-sysop users won't be able
* to modify it by uploading a new revision.
*/
if( !$nt->userCanEdit() ) {
return $this->uploadError( wfMsg( 'protectedpage' ) );
}
/* Don't allow users to override the blacklist (check file extension) */
global $wgStrictFileExtensions;
global $wgFileExtensions, $wgFileBlacklist;
if( $this->checkFileExtensionList( $ext, $wgFileBlacklist ) ||
($wgStrictFileExtensions &&
!$this->checkFileExtension( $finalExt, $wgFileExtensions ) ) ) {
return $this->uploadError( wfMsg( 'badfiletype', htmlspecialchars( $fullExt ) ) );
}
/**
* Look at the contents of the file; if we can recognize the
* type but it's corrupt or data of the wrong type, we should
* probably not accept it.
*/
if( !$this->mStashed ) {
$veri= $this->verify($this->mUploadTempName, $finalExt);
if( $veri !== true ) { //it's a wiki error...
return $this->uploadError( $veri->toString() );
}
}
/**
* Check for non-fatal conditions
*/
if ( ! $this->mIgnoreWarning ) {
$warning = ;
if( $this->mUploadSaveName != ucfirst( $filtered ) ) {
$warning .= '
'.wfMsg( 'badfilename', htmlspecialchars( $this->mUploadSaveName ) ).' ';
}
global $wgCheckFileExtensions;
if ( $wgCheckFileExtensions ) {
if ( ! $this->checkFileExtension( $finalExt, $wgFileExtensions ) ) {
$warning .= '
'.wfMsg( 'badfiletype', htmlspecialchars( $fullExt ) ).' ';
}
}
global $wgUploadSizeWarning;
if ( $wgUploadSizeWarning && ( $this->mUploadSize > $wgUploadSizeWarning ) ) {
# TODO: Format $wgUploadSizeWarning to something that looks better than the raw byte
# value, perhaps add GB,MB and KB suffixes?
$warning .= '
'.wfMsg( 'largefile', $wgUploadSizeWarning, $this->mUploadSize ).' ';
}
if ( $this->mUploadSize == 0 ) {
$warning .= '
'.wfMsg( 'emptyfile' ).' ';
}
if( $nt->getArticleID() ) {
global $wgUser;
$sk = $wgUser->getSkin();
$dlink = $sk->makeKnownLinkObj( $nt );
$warning .= '
'.wfMsg( 'fileexists', $dlink ).' ';
}
if( $warning != ) {
/**
* Stash the file in a temporary location; the user can choose
* to let it through and we'll complete the upload then.
*/
return $this->uploadWarning($warning);
}
}
/**
* Try actually saving the thing...
* It will show an error form on failure.
*/
if( $this->saveUploadedFile( $this->mUploadSaveName,
$this->mUploadTempName,
!empty( $this->mSessionKey ) ) ) {
/**
* Update the upload log and create the description page
* if it's a new file.
*/
$img = Image::newFromName( $this->mUploadSaveName );
$success = $img->recordUpload( $this->mUploadOldVersion,
$this->mUploadDescription,
$this->mUploadCopyStatus,
$this->mUploadSource );
if ( $success ) {
$this->showSuccess();
} else {
// Image::recordUpload() fails if the image went missing, which is
// unlikely, hence the lack of a specialised message
$wgOut->fileNotFoundError( $this->mUploadSaveName );
}
}
}
/**
* Move the uploaded file from its temporary location to the final
* destination. If a previous version of the file exists, move
* it into the archive subdirectory.
*
* @todo If the later save fails, we may have disappeared the original file.
*
* @param string $saveName
* @param string $tempName full path to the temporary file
* @param bool $useRename if true, doesn't check that the source file
* is a PHP-managed upload temporary
*/
function saveUploadedFile( $saveName, $tempName, $useRename = false ) {
global $wgUploadDirectory, $wgOut;
$fname= "SpecialUpload::saveUploadedFile";
$dest = wfImageDir( $saveName );
$archive = wfImageArchiveDir( $saveName );
$this->mSavedFile = "{$dest}/{$saveName}";
if( is_file( $this->mSavedFile ) ) {
$this->mUploadOldVersion = gmdate( 'YmdHis' ) . "!{$saveName}";
wfSuppressWarnings();
$success = rename( $this->mSavedFile, "${archive}/{$this->mUploadOldVersion}" );
wfRestoreWarnings();
if( ! $success ) {
$wgOut->fileRenameError( $this->mSavedFile,
"${archive}/{$this->mUploadOldVersion}" );
return false;
}
else wfDebug("$fname: moved file ".$this->mSavedFile." to ${archive}/{$this->mUploadOldVersion}\n");
}
else {
$this->mUploadOldVersion = ;
}
if( $useRename ) {
wfSuppressWarnings();
$success = rename( $tempName, $this->mSavedFile );
wfRestoreWarnings();
if( ! $success ) {
$wgOut->fileCopyError( $tempName, $this->mSavedFile );
return false;
} else {
wfDebug("$fname: wrote tempfile $tempName to ".$this->mSavedFile."\n");
}
} else {
wfSuppressWarnings();
$success = copy ($tempName, $this->mSavedFile) ;
//$success = move_uploaded_file( $tempName, $this->mSavedFile );
wfRestoreWarnings();
if( ! $success ) {
$wgOut->fileCopyError( $tempName, $this->mSavedFile );
return false;
}
else wfDebug("$fname: wrote tempfile $tempName to ".$this->mSavedFile."\n");
}
chmod( $this->mSavedFile, 0644 );
return true;
}
/**
* Stash a file in a temporary directory for later processing
* after the user has confirmed it.
*
* If the user doesn't explicitly cancel or accept, these files
* can accumulate in the temp directory.
*
* @param string $saveName - the destination filename
* @param string $tempName - the source temporary file to save
* @return string - full path the stashed file, or false on failure
* @access private
*/
function saveTempUploadedFile( $saveName, $tempName ) {
global $wgOut;
$archive = wfImageArchiveDir( $saveName, 'temp' );
$stash = $archive . '/' . gmdate( "YmdHis" ) . '!' . $saveName;
if ( !move_uploaded_file( $tempName, $stash ) ) {
$wgOut->fileCopyError( $tempName, $stash );
return false;
}
return $stash;
}
/**
* Stash a file in a temporary directory for later processing,
* and save the necessary descriptive info into the session.
* Returns a key value which will be passed through a form
* to pick up the path info on a later invocation.
*
* @return int
* @access private
*/
function stashSession() {
$stash = $this->saveTempUploadedFile(
$this->mUploadSaveName, $this->mUploadTempName );
if( !$stash ) {
# Couldn't save the file.
return false;
}
$key = mt_rand( 0, 0x7fffffff );
$_SESSION['wsUploadData'][$key] = array(
'mUploadTempName' => $stash,
'mUploadSize' => $this->mUploadSize,
'mOname' => $this->mOname );
return $key;
}
/**
* Remove a temporarily kept file stashed by saveTempUploadedFile().
* @access private
*/
function unsaveUploadedFile() {
wfSuppressWarnings();
$success = unlink( $this->mUploadTempName );
wfRestoreWarnings();
if ( ! $success ) {
$wgOut->fileDeleteError( $this->mUploadTempName );
}
}
/* -------------------------------------------------------------- */
/**
* Show some text and linkage on successful upload.
* @access private
*/
function showSuccess() {
global $wgUser, $wgOut, $wgContLang;
$sk = $wgUser->getSkin();
$ilink = $sk->makeMediaLink( $this->mUploadSaveName, Image::imageUrl( $this->mUploadSaveName ) );
$dname = $wgContLang->getNsText( NS_IMAGE ) . ':'.$this->mUploadSaveName;
$dlink = $sk->makeKnownLink( $dname, $dname );
$wgOut->addHTML( '
' . wfMsg( 'successfulupload' ) . "
\n" );
$text = wfMsg( 'fileuploaded', $ilink, $dlink );
$wgOut->addHTML( $text );
$wgOut->returnToMain( false );
}
/**
* @param string $error as HTML
* @access private
*/
function uploadError( $error ) {
global $wgOut;
$sub = wfMsg( 'uploadwarning' );
$wgOut->addHTML( "
{$sub}
\n" );
$wgOut->addHTML( "
{$error}
\n" );
}
/**
* There's something wrong with this file, not enough to reject it
* totally but we require manual intervention to save it for real.
* Stash it away, then present a form asking to confirm or cancel.
*
* @param string $warning as HTML
* @access private
*/
function uploadWarning( $warning ) {
global $wgOut, $wgUser, $wgLang, $wgUploadDirectory, $wgRequest;
global $wgUseCopyrightUpload;
$this->mSessionKey = $this->stashSession();
if( !$this->mSessionKey ) {
# Couldn't save file; an error has been displayed so let's go.
return;
}
$sub = wfMsg( 'uploadwarning' );
$wgOut->addHTML( "
{$sub}
\n" );
$wgOut->addHTML( "
{$warning}
\n" );
$save = wfMsg( 'savefile' );
$reupload = wfMsg( 'reupload' );
$iw = wfMsg( 'ignorewarning' );
$reup = wfMsg( 'reuploaddesc' );
$titleObj = Title::makeTitle( NS_SPECIAL, 'Upload' );
$action = $titleObj->escapeLocalURL( 'action=submit' );
if ( $wgUseCopyrightUpload )
{
$copyright = "
<input type='hidden' name='wpUploadCopyStatus' value=\"" . htmlspecialchars( $this->mUploadCopyStatus ) . "\" />
<input type='hidden' name='wpUploadSource' value=\"" . htmlspecialchars( $this->mUploadSource ) . "\" />
";
} else {
$copyright = "";
}
$wgOut->addHTML( "
<form id='uploadwarning' method='post' enctype='multipart/form-data' action='$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='wpDestFile' value=\"" . htmlspecialchars( $this->mDestFile ) . "\" />
{$copyright}
<input tabindex='2' type='submit' name='wpUpload' value='$save' />
$iw
<input tabindex='2' type='submit' name='wpReUpload' value='{$reupload}' />
$reup
</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 = wfMsg( 'uploaderror' );
$wgOut->addHTML( "
{$sub}
\n" .
"
{$msg}
\n" );
}
$wgOut->addWikiText( wfMsg( 'uploadtext' ) );
$sk = $wgUser->getSkin();
$sourcefilename = wfMsg( 'sourcefilename' );
$destfilename = wfMsg( 'destfilename' );
$fd = wfMsg( 'filedesc' );
$ulb = wfMsg( 'uploadbtn' );
$iw = wfMsg( 'ignorewarning' );
$titleObj = Title::makeTitle( NS_SPECIAL, 'Upload' );
$action = $titleObj->escapeLocalURL();
$encDestFile = htmlspecialchars( $this->mDestFile );
$source = null;
if ( $wgUseCopyrightUpload )
{
$source = "
" . wfMsg ( 'filestatus' ) . ":
<input tabindex='3' type='text' name=\"wpUploadCopyStatus\" value=\"" .
htmlspecialchars($this->mUploadCopyStatus). "\" size='40' />
". wfMsg ( 'filesource' ) . ":
<input tabindex='4' type='text' name='wpUploadSource' value=\"" .
htmlspecialchars($this->mUploadSource). "\" size='40' />
" ;
}
$wgOut->addHTML( "
<form id='upload' method='post' enctype='multipart/form-data' action=\"$action\">
{$source}
{$sourcefilename}:
<input tabindex='1' type='file' name='wpUploadFile' id='wpUploadFile' onchange='fillDestFilename()' size='40' />
{$destfilename}:
<input tabindex='1' type='text' name='wpDestFile' id='wpDestFile' size='40' value=\"$encDestFile\" />
{$fd}:
<textarea tabindex='2' name='wpUploadDescription' rows='6' cols='{$cols}'{$ew}>"
. htmlspecialchars( $this->mUploadDescription ) .
"</textarea>
<input tabindex='5' type='submit' name='wpUpload' value=\"{$ulb}\" />
</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 opf 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( "
Bad configuration: unknown virus scanner: $wgAntivirus\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;
}
}
}
?>
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