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<?php
/**
* Bitrix Security Module
* @package Bitrix
* @subpackage Security
* @copyright 2001-2013 Bitrix
* @since File available since 14.0.0
*/
namespace Bitrix\Security\Filter;
use Bitrix\Main\Config\Option;
use Bitrix\Main\Type\IRequestFilter;
/**
* Filter for Request variables, such as superglobals $_GET, $_POST etc
*
* @package Bitrix\Security\Filter
* @since 14.0.0
*/
class Request
implements IRequestFilter
{
const ACTION_NONE = 'none';
const ACTION_CLEAR = 'clear';
const ACTION_FILTER = 'filter';
/** @var Auditor\Base[] */
protected $auditors = array();
protected $changedContext = array();
private $action = 'filter';
private $doLog = false;
private $changedVars = array();
private $isAuditorsTriggered = false;
private $filteringMap = array(
'get' => array(
'Name' => '$_GET',
),
'post' => array(
'Name' => '$_POST',
'SkipRegExp' => '#^File\d+_\d+$#'
),
'cookie' => array(
'Name' => '$_COOKIE'
)
);
private static $validActions = array(
self::ACTION_NONE,
self::ACTION_CLEAR,
self::ACTION_FILTER,
);
public function __construct($customOptions = array())
{
if (isset($customOptions['action']))
{
$this->setAction($customOptions['action']);
}
else
{
$this->setAction(Option::get('security', 'filter_action'));
}
if (isset($customOptions['log']))
{
$this->setLog($customOptions['log']);
}
else
{
$this->setLog(Option::get('security', 'filter_log'));
}
}
/**
* Set auditors for use in filtration
*
* @param Auditor\Base[] $auditors
* @return $this
*/
public function setAuditors(array $auditors)
{
$this->auditors = $auditors;
return $this;
}
/**
* Return all changed variables, can be useful for logging
*
* @return array
*/
public function getChangedVars()
{
return $this->changedVars;
}
/**
* Return array with filtered values
*
* Simple example:
* <code>
* $ob = new Request();
* $ob->setAuditors([
* 'SQL' => new Auditor\Sql()
* ]);
* print_r(
* $ob->filter([
* 'get' => ['safe bar'],
* 'post' => ['select * from foo']
* ])
* );
* //output: Array ( [post] => Array ( [0] => sel ect * fr om foo ) )
*
* print_r(
* $ob->filter([
* 'get' => ['safe bar'],
* 'post' => ['select * from foo']
* ],
* false
* )
* );
* //output: Array ( [get] => Array ( [0] => safe bar ) [post] => Array ( [0] => sel ect * fr om foo ) )
* </code>
*
* @example tests/security/filter/requestfilter.php
* @param array $values array("get" => $_GET, "post" => $_POST, "files" => $_FILES, "cookie" => $_COOKIE)
* @param bool $isReturnChangedOnly if true - return values only if it changed by some auditors
* @return array
*/
public function filter(array $values, $isReturnChangedOnly = true)
{
$this->onFilterStarted();
foreach ($values as $key => &$val)
{
if (!isset($this->filteringMap[$key]))
continue;
$val = $this->filterArray(
$key,
$val,
$this->filteringMap[$key]['Name'],
isset($this->filteringMap[$key]['SkipRegExp'])? $this->filteringMap[$key]['SkipRegExp']: ''
);
}
unset($val);
$this->onFilterFinished();
if ($isReturnChangedOnly)
return array_intersect_key($values, $this->changedContext);
else
return $values;
}
/**
* @since 14.0.3
* @return bool
*/
public function isAuditorsTriggered()
{
return $this->isAuditorsTriggered;
}
protected function onFilterStarted()
{
$this->changedContext = array();
$this->changedVars = array();
$this->isAuditorsTriggered = false;
}
protected function onFilterFinished()
{
}
/**
* @param string $context
* @param string $value
* @param string $name
* @return string
*/
protected function filterVar($context, $value, $name)
{
if (preg_match('#^[A-Za-z0-9_.,-]*$#D', $value))
return $value;
$filteredValue = \CSecurityHtmlEntity::decodeString($value);
self::adjustPcreBacktrackLimit($filteredValue);
$isValueChanged = false;
foreach($this->auditors as $auditName => $auditor)
{
if ($auditor->process($filteredValue))
{
$this->isAuditorsTriggered = true;
if ($this->isLogNeeded())
{
$this->logVariable($value, $name, $auditName);
}
if ($this->isFilterAction())
{
$isValueChanged = true;
$filteredValue = $auditor->getFilteredValue();
}
elseif ($this->isClearAction())
{
$isValueChanged = true;
$filteredValue = '';
break;
}
}
}
if ($isValueChanged)
{
$this->pushChangedVar($context, $value, $name);
return $filteredValue;
}
else
{
return $value;
}
}
/**
* @param string $context
* @param array $array
* @param string $name
* @param string $skipKeyPreg
* @return array
*/
protected function filterArray($context, array $array, $name, $skipKeyPreg = '')
{
if (!is_array($array))
return $array;
foreach($array as $key => $value)
{
if ($skipKeyPreg && preg_match($skipKeyPreg, $key))
continue;
$filteredKey = $this->filterVar($context, $key, "{$name}['{$key}']");
if ($filteredKey != $key)
{
unset($array[$key]);
$key = $filteredKey;
}
if (is_array($value))
{
$array[$key] = $this->filterArray($context, $value, "{$name}['{$key}']", $skipKeyPreg);
}
else
{
$array[$key] = $this->filterVar($context, $value, "{$name}['{$key}']");
}
}
return $array;
}
/**
* @param $action
* @return bool
*/
protected static function isActionValid($action)
{
return in_array($action, self::getValidActions());
}
/**
* @param string $value
* @param string $name
* @param string $auditorName
* @return bool
*/
protected static function logVariable($value, $name, $auditorName)
{
return \CSecurityEvent::getInstance()->doLog('SECURITY', 'SECURITY_FILTER_'.$auditorName, $name, $value);
}
/**
* @param $string
* @return bool
*/
protected static function adjustPcreBacktrackLimit($string)
{
if (!is_string($string))
return false;
$strlen = \CUtil::binStrlen($string) * 2;
\CUtil::adjustPcreBacktrackLimit($strlen);
return true;
}
/**
* @return array
*/
protected static function getValidActions()
{
return self::$validActions;
}
/**
* @param $action
* @return $this
*/
protected function setAction($action)
{
if (self::isActionValid($action))
{
$this->action = $action;
}
return $this;
}
/**
* @param $log
* @return $this
*/
protected function setLog($log)
{
$this->doLog = (is_string($log) && $log == 'Y');
return $this;
}
/**
* @return bool
*/
protected function isFilterAction()
{
return ($this->action === self::ACTION_FILTER);
}
/**
* @return bool
*/
protected function isClearAction()
{
return ($this->action === self::ACTION_CLEAR);
}
/**
* @return bool
*/
protected function isLogNeeded()
{
return $this->doLog;
}
/**
* @param string $context
* @param string $value
* @param string $name
* @return $this
*/
protected function pushChangedVar($context, $value, $name)
{
$this->changedVars[$name] = $value;
if (!isset($this->changedContext[$context]))
$this->changedContext[$context] = 1;
return $this;
}
}