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<?php
namespace Kanboard\Core;
/**
* Security class
*
* @package core
* @author Frederic Guillot
*/
class Security
{
/**
* Generate a random token with different methods: openssl or /dev/urandom or fallback to uniqid()
*
* @static
* @access public
* @return string Random token
*/
public static function generateToken()
{
if (function_exists('openssl_random_pseudo_bytes')) {
return bin2hex(\openssl_random_pseudo_bytes(30));
}
else if (ini_get('open_basedir') === '' && strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') {
return hash('sha256', file_get_contents('/dev/urandom', false, null, 0, 30));
}
return hash('sha256', uniqid(mt_rand(), true));
}
/**
* Generate and store a CSRF token in the current session
*
* @static
* @access public
* @return string Random token
*/
public static function getCSRFToken()
{
$nonce = self::generateToken();
if (empty($_SESSION['csrf_tokens'])) {
$_SESSION['csrf_tokens'] = array();
}
$_SESSION['csrf_tokens'][$nonce] = true;
return $nonce;
}
/**
* Check if the token exists for the current session (a token can be used only one time)
*
* @static
* @access public
* @param string $token CSRF token
* @return bool
*/
public static function validateCSRFToken($token)
{
if (isset($_SESSION['csrf_tokens'][$token])) {
unset($_SESSION['csrf_tokens'][$token]);
return true;
}
return false;
}
/**
* Check if the token used in a form is correct and then remove the value
*
* @static
* @access public
* @param array $values Form values
* @return bool
*/
public static function validateCSRFFormToken(array &$values)
{
if (! empty($values['csrf_token']) && self::validateCSRFToken($values['csrf_token'])) {
unset($values['csrf_token']);
return true;
}
return false;
}
}
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