Sbgodin/HtmGem
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Enable security on what gmi file the client asks.

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* checks realPath() against no-existent files,
* checks the file suffix '.gmi'
* checks the directory belongs to that of the site.
This commit is contained in:
Christophe HENRY 2021-03-18 21:18:49 +01:00
parent 365c855c00
commit 232cecc398
1 changed files with 16 additions and 4 deletions
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20
index.php
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@ -21,16 +21,26 @@ if (empty($url)) {
exit();
}
# to false only if textDecoration=0 in the URL
$textDecoration = "0" != @$_REQUEST['textDecoration'];
$documentRoot = $_SERVER['DOCUMENT_ROOT'];
# Removes the headling and trailling slashes, to be sure there's not any.
$filePath = rtrim($_SERVER['DOCUMENT_ROOT'], "/")."/".ltrim($url, "/");
switch(true) {
case false:
case !realPath($filePath):
case !preg_match("/\.gmi$/", $url): # not finishing by .gmi
case strpos($filePath, $documentRoot)!==0: # not in web directory
$go404 = true;
// Says 404 even if the file exists to not give any information.
break;
default:
$go404 = false;
}
/* 404 page
*/
if (!file_exists($filePath)) {
if ($go404) {
error_log("HtmGem: 404 $url $filePath");
http_response_code(404);
$page404 = <<<EOF
@ -45,6 +55,8 @@ EOF;
exit();
}
# to false only if textDecoration=0 in the URL
$textDecoration = "0" != @$_REQUEST['textDecoration'];
$fileContents = @file_get_contents($filePath);
# Removes the Byte Order Mark