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Security fix for #73, dont allow downloading of disallowed extensions

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This commit is contained in:
John Campbell
2019-10-24 11:24:41 -06:00
parent ae87964f8c
commit cebe7f5194
1 changed files with 7 additions and 2 deletions
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9
index.php
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@@ -49,6 +49,9 @@ if(substr($tmp, 0,strlen($tmp_dir)) !== $tmp_dir)
err(403,"Forbidden");
if(strpos($_REQUEST['file'], DIRECTORY_SEPARATOR) === 0)
err(403,"Forbidden");
if(preg_match('@^.+://@',$_REQUEST['file'])) {
err(403,"Forbidden");
}
if(!$_COOKIE['_sfm_xsrf'])
@@ -59,8 +62,6 @@ if($_POST) {
}
$file = $_REQUEST['file'] ?: '.';
// strip url syntax, like file://....
$file = preg_replace('@^.+://@','',$file);
if($_GET['do'] == 'list') {
if (is_dir($file)) {
@@ -110,6 +111,10 @@ if($_GET['do'] == 'list') {
$res = move_uploaded_file($_FILES['file_data']['tmp_name'], $file.'/'.$_FILES['file_data']['name']);
exit;
} elseif ($_GET['do'] == 'download') {
foreach($disallowed_extensions as $ext)
if(preg_match(sprintf('/\.%s$/',preg_quote($ext)), $file))
err(403,"Files of this type are not allowed.");
$filename = basename($file);
$finfo = finfo_open(FILEINFO_MIME_TYPE);
header('Content-Type: ' . finfo_file($finfo, $file));