<?php
/**
* Security
*
* @package GetSimple
* @subpackage init
*/
/*
* File and File MIME-TYPE Blacklist arrays
*/
$mime_type_blacklist = array(
# HTML may contain cookie-stealing JavaScript and web bugs
'text/html', 'text/javascript', 'text/x-javascript', 'application/x-shellscript',
# PHP scripts may execute arbitrary code on the server
'application/x-php', 'text/x-php',
# Other types that may be interpreted by some servers
'text/x-python', 'text/x-perl', 'text/x-bash', 'text/x-sh', 'text/x-csh',
# Client-side hazards on Internet Explorer
'text/scriptlet', 'application/x-msdownload',
# Windows metafile, client-side vulnerability on some systems
'application/x-msmetafile',
# MS Office OpenXML and other Open Package Conventions files are zip files
# and thus blacklisted just as other zip files
'application/x-opc+zip'
);
$file_ext_blacklist = array(
# HTML may contain cookie-stealing JavaScript and web bugs
'html', 'htm', 'js', 'jsb', 'mhtml', 'mht',
# PHP scripts may execute arbitrary code on the server
'php', 'phtml', 'php3', 'php4', 'php5', 'phps',
# Other types that may be interpreted by some servers
'shtml', 'jhtml', 'pl', 'py', 'cgi', 'sh', 'ksh', 'bsh', 'c', 'htaccess', 'htpasswd',
# May contain harmful executables for Windows victims
'exe', 'scr', 'dll', 'msi', 'vbs', 'bat', 'com', 'pif', 'cmd', 'vxd', 'cpl'
);
/**
* Anti-XSS
*
* Attempts to clean variables from XSS attacks
* @since 2.03
*
* @author Martijn van der Ven
*
* @param string $str The string to be stripped of XSS attempts
* @return string
*/
function antixss($str){
// attributes blacklist:
$attr = array('style','on[a-z]+');
// elements blacklist:
$elem = array('script','iframe','embed','object');
// extermination:
$str = preg_replace('#<!--.*?-->?#', '', $str);
$str = preg_replace('#<!--#', '', $str);
$str = preg_replace('#(<[a-z]+(\s+[a-z][a-z\-]+\s*=\s*(\'[^\']*\'|"[^"]*"|[^\'">][^\s>]*))*)\s+href\s*=\s*(\'javascript:[^\']*\'|"javascript:[^"]*"|javascript:[^\s>]*)((\s+[a-z][a-z\-]*\s*=\s*(\'[^\']*\'|"[^"]*"|[^\'">][^\s>]*))*\s*>)#is', '$1$5', $str);
foreach($attr as $a) {
$regex = '(<[a-z]+(\s+[a-z][a-z\-]+\s*=\s*(\'[^\']*\'|"[^"]*"|[^\'">][^\s>]*))*)\s+'.$a.'\s*=\s*(\'[^\']*\'|"[^"]*"|[^\'">][^\s>]*)((\s+[a-z][a-z\-]*\s*=\s*(\'[^\']*\'|"[^"]*"|[^\'">][^\s>]*))*\s*>)';
$str = preg_replace('#'.$regex.'#is', '$1$5', $str);
}
foreach($elem as $e) {
$regex = '<'.$e.'(\s+[a-z][a-z\-]*\s*=\s*(\'[^\']*\'|"[^"]*"|[^\'">][^\s>]*))*\s*>.*?<\/'.$e.'\s*>';
$str = preg_replace('#'.$regex.'#is', '', $str);
}
return $str;
}
/**
* Get Nonce
*
* @since 2.03
* @author tankmiche
* @uses $USR
* @uses $SALT
*
* @param string $action Id of current page
* @param string $file Optional, default is empty string
* @param bool $last
* @return string
*/
function get_nonce($action, $file = "", $last = false) {
global $USR;
global $SALT;
if($file == "")
$file = $_SERVER['PHP_SELF'];
// using user agent since ip can change on proxys
$uid = $_SERVER['HTTP_USER_AGENT'];
// Limits Nonce to one hour
$time = $last ? time() - 3600: time();
// Mix with a little salt
$hash=sha1($action.$file.$uid.$USR.$SALT.@date('YmdH',$time));
return $hash;
}
/**
* Check Nonce
*
* @since 2.03
* @author tankmiche
* @uses get_nonce
*
* @param string $nonce
* @param string $action
* @param string $file Optional, default is empty string
* @return bool
*/
function check_nonce($nonce, $action, $file = ""){
return ( $nonce === get_nonce($action, $file) || $nonce === get_nonce($action, $file, true) );
}
/*
* Validate Safe File
*
* @since 3.1
* @uses file_mime_type
* @uses $mime_type_blacklist
* @uses $file_ext_blacklist
*
* @param string $file, absolute path
* @param string $name, default null
* @param string $type, default 'upload'
* @return bool
*/
function validate_safe_file($file, $name, $mime){
global $mime_type_blacklist, $file_ext_blacklist, $mime_type_whitelist, $file_ext_whitelist;
include(GSADMININCPATH.'configuration.php');
$file_extention = pathinfo($name,PATHINFO_EXTENSION);
$file_mime_type = $mime;
if ($mime_type_whitelist && in_arrayi($file_mime_type, $mime_type_whitelist)) {
return true;
} elseif ($file_ext_whitelist && $in_arrayi($file_extention, $file_ext_whitelist)) {
return true;
}
// skip blackist checks if whitelists exist
if($mime_type_whitelist || $file_ext_whitelist) return false;
if (in_arrayi($file_mime_type, $mime_type_blacklist)) {
return false;
} elseif (in_arrayi($file_extention, $file_ext_blacklist)) {
return false;
} else {
return true;
}
}
/**
* Checks that an existing filepath is safe to use by checking canonicalized absolute pathname.
*
* @since 3.1.3
*
* @param string $path Unknown Path to file to check for safety
* @param string $pathmatch Known Path to parent folder to check against
* @param bool $subdir allow path to be a deeper subfolder
* @return bool Returns true if files path resolves to your known path
*/
function filepath_is_safe($path,$pathmatch,$subdir = true){
$realpath = realpath($path);
$realpathmatch = realpath($pathmatch);
if($subdir) return strpos(dirname($realpath),$realpathmatch) === 0;
return dirname($realpath) == $realpathmatch;
}
/**
* Checks that an existing path is safe to use by checking canonicalized absolute path
*
* @since 3.1.3
*
* @param string $path Unknown Path to check for safety
* @param string $pathmatch Known Path to check against
* @param bool $subdir allow path to be a deeper subfolder
* @return bool Returns true if $path is direct subfolder of $pathmatch
*
*/
function path_is_safe($path,$pathmatch,$subdir = true){
$realpath = realpath($path);
$realpathmatch = realpath($pathmatch);
if($subdir) return strpos($realpath,$realpathmatch) === 0;
return $realpath == $realpathmatch;
}
/**
* Check if server is Apache
*
* @returns bool
*/
function server_is_apache() {
return( strpos(strtolower($_SERVER['SERVER_SOFTWARE']),'apache') !== false );
}
/**
* Performs filtering on variable, falls back to htmlentities
*
* @since 3.3.0
* @param string $var var to filter
* @param string $filter filter type
* @return string return filtered string
*/
function var_out($var,$filter = "special"){
if(function_exists( "filter_var") ){
$aryFilter = array(
"string" => FILTER_SANITIZE_STRING,
"int" => FILTER_SANITIZE_NUMBER_INT,
"float" => FILTER_SANITIZE_NUMBER_FLOAT,
"url" => FILTER_SANITIZE_URL,
"email" => FILTER_SANITIZE_EMAIL,
"special" => FILTER_SANITIZE_SPECIAL_CHARS,
);
if(isset($aryFilter[$filter])) return filter_var( $var, $aryFilter[$filter]);
return filter_var( $var, FILTER_SANITIZE_SPECIAL_CHARS);
}
else {
return htmlentities($var);
}
}