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<?php
class CSecurityXSSDetect
{
const SCRIPT_MARK = '<!-- deleted by bitrix WAF -->';
private $quotes = array();
private $action = "filter";
private $doLog = false;
/** @var CSecurityXSSDetectVariables */
private $variables = null;
/** @var string[] */
private $searches = null;
/** @var string[] */
private $quotedSearches = null;
function __construct($options = array())
{
if(isset($options["action"]))
{
$this->setAction($options["action"]);
}
else
{
$this->setAction(COption::GetOptionString("security", "filter_action"));
}
if(isset($options["log"]))
{
$this->setLog($options["log"]);
}
else
{
$this->setLog(COption::GetOptionString("security", "filter_log"));
}
}
/**
* @param $content
*/
public static function OnEndBufferContent(&$content)
{
if (CSecuritySystemInformation::isCliMode())
return;
if (CSecurityFilterMask::Check(SITE_ID, $_SERVER["REQUEST_URI"]))
return;
if (!preg_match('#</script#', $content)) // Probably does not include the scripts
return;
$filter = new CSecurityXSSDetect();
$filter->process($content);
}
/**
* @param string $content
* @return void
*/
public function process(&$content)
{
$this->variables = new CSecurityXSSDetectVariables();
$this->extractVariablesFromArray("\$_GET", $_GET);
$this->extractVariablesFromArray("\$_POST", $_POST);
$this->extractVariablesFromArray("\$_SERVER[REQUEST_URI]", explode("/",$_SERVER['REQUEST_URI']));
if(!$this->variables->isEmpty())
{
$this->searches = $this->variables->getSearchValues();
$this->quotedSearches = $this->variables->getQuoteSearchValues();
$content = $this->filter($content);
}
}
/**
* @return array
*/
public function getQuotes()
{
return $this->quotes;
}
/**
* @param string $string
* @param bool $isSaveQuotes
* @return mixed
*/
public function removeQuotedStrings($string, $isSaveQuotes = true)
{
// http://stackoverflow.com/questions/5695240/php-regex-to-ignore-escaped-quotes-within-quotes
// ToDo: R&D, what about JS comments?
static $regexp = '/(
"[^"\\\\]*(?:\\\\.[^"\\\\]*)*" # match double quoted string
|
\'[^\'\\\\]*(?:\\\\.[^\'\\\\]*)*\' # match single quoted string
)/xs';
if ($isSaveQuotes)
{
$this->quotes = array();
return preg_replace_callback($regexp, array($this, "pushQuote"), $string);
}
return preg_replace($regexp, '', $string);
}
/**
* @param string $action
*/
protected function setAction($action)
{
$this->action = $action;
}
/**
* @param string $log - only Y/N
*/
protected function setLog($log)
{
if(is_string($log) && $log == "Y")
{
$this->doLog = true;
}
else
{
$this->doLog = false;
}
}
/**
* @param $name
* @param $value
* @param $sourceScript
* @return mixed
*/
protected function logVariable($name, $value, $sourceScript)
{
if(defined("ANTIVIRUS_CREATE_TRACE"))
$this->CreateTrace($name, $value, $sourceScript);
return CSecurityEvent::getInstance()->doLog("SECURITY", "SECURITY_FILTER_XSS2", $name, $value);
}
/**
* @param $var_name
* @param $str
* @param $script
*/
protected function CreateTrace($var_name, $str, $script)
{
$cache_id = md5($var_name.'|'.$str);
$fn = $_SERVER["DOCUMENT_ROOT"]."/bitrix/cache/virus.db/".$cache_id.".flt";
if(!file_exists($fn))
{
CheckDirPath($fn);
$f = fopen($fn, "wb");
fwrite($f, $var_name.": ".$str);
fwrite($f, "\n------------\n".$script);
fwrite($f, "\n------------------------------\n\$_SERVER:\n");
foreach($_SERVER as $k=>$v)
fwrite($f, $k." = ".$v."\n");
fclose($f);
@chmod($fn, BX_FILE_PERMISSIONS);
}
}
/**
* @param string $quote
* @return string
*/
protected function pushQuote($quote)
{
$this->quotes[] = $quote[0];
return "";
}
/**
* @param string $string
* @param array $searches
* @return null|string
*/
protected function findInArray($string, $searches)
{
foreach($searches as $i => $search)
{
$pos = static::fastStrpos($string, $search["value"]);
if ($pos !== false)
{
$prevChar = static::fastSubstr($string, $pos - 1, 1);
$isFound = ($prevChar !== '\\');
if ($isFound && preg_match("/^[a-zA-Z_]/", $search["value"]))
{
$isFound = preg_match("/^[a-zA-Z_]/", $prevChar) <= 0;
}
}
if ($isFound)
return $i;
}
return null;
}
/**
* @param string $body
* @return array|false
*/
protected function isDangerBody($body)
{
$search = $this->findInArray($body, $this->quotedSearches);
if ($search !== null)
{
return $this->quotedSearches[$search];
}
else if (!empty($this->searches))
{
$bodyWithoutQuotes = $this->removeQuotedStrings($body, false);
$search = $this->findInArray($bodyWithoutQuotes, $this->searches);
if ($search !== null)
{
return $this->searches[$search];
}
}
return false;
}
/**
* @param string $body
* @return string
*/
protected function getFilteredScriptBody($body)
{
if($var = $this->isDangerBody($body))
{
if($this->doLog)
{
$this->logVariable($var["name"], $var["value"], $str);
}
if($this->action !== "none")
{
$body = self::SCRIPT_MARK;
}
}
return $body;
}
/**
* @param array $strs
* @return string
*/
protected function getFilteredScript($strs)
{
if(trim($strs[2]) === "")
return $strs[0];
else
return $strs[1].$this->getFilteredScriptBody($strs[2]).$strs[3];
}
/**
* @param string $string
* @return string
*/
protected function filter($string)
{
$stringLen = CUtil::BinStrlen($string) * 2;
CUtil::AdjustPcreBacktrackLimit($stringLen);
return preg_replace_callback("/(<script[^>]*>)(.*?)(<\\/script[^>]*>)/is", array($this, "getFilteredScript"), $string);
}
/**
* @param string $name
* @param string $value
*/
protected function addVariable($name, $value)
{
if(!is_string($value))
return;
if(mb_strlen($value) <= 2)
return; //too short
if(preg_match("/^(?P<quot>[\"']?)[^`,;+\-*\/\{\}\[\]\(\)&\\|=\\\\]*(?P=quot)\$/D", $value))
return; //there is no potantially dangerous code
if(preg_match("/^[,0-9_-]*\$/D", $value))
return; //there is no potantially dangerous code
if(preg_match("/^[0-9 \n\r\t\\[\\]]*\$/D", $value))
return; //there is no potantially dangerous code
$this->variables->addVariable($name, $value);
}
/**
* @param string $name
* @param array $array
*/
protected function extractVariablesFromArray($name, $array)
{
if(!is_array($array))
return;
foreach($array as $key => $value)
{
$variableName = sprintf('%s[%s]', $name, $key);
if (is_array($value))
$this->extractVariablesFromArray($variableName, $value);
else
$this->addVariable($variableName, $value);
}
}
protected static function fastStrpos($haystack, $needle)
{
if (function_exists("mb_orig_strpos"))
{
return mb_orig_strpos($haystack, $needle);
}
return mb_strpos($haystack, $needle);
}
protected static function fastSubstr($string, $start, $length = null)
{
if (function_exists("mb_orig_substr"))
{
return mb_orig_substr($string, $start, $length);
}
return mb_substr($string, $start, $length);
}
}