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<?php
namespace Kanboard\Core\Security;
use Kanboard\Core\Base;
/**
* Token Handler
*
* @package security
* @author Frederic Guillot
*/
class Token extends Base
{
/**
* 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 getToken()
{
if (function_exists('random_bytes')) {
return bin2hex(random_bytes(30));
} elseif (function_exists('openssl_random_pseudo_bytes')) {
return bin2hex(openssl_random_pseudo_bytes(30));
} elseif (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
*
* @access public
* @return string Random token
*/
public function getCSRFToken()
{
if (! isset($this->sessionStorage->csrf)) {
$this->sessionStorage->csrf = array();
}
$nonce = self::getToken();
$this->sessionStorage->csrf[$nonce] = true;
return $nonce;
}
/**
* Check if the token exists for the current session (a token can be used only one time)
*
* @access public
* @param string $token CSRF token
* @return bool
*/
public function validateCSRFToken($token)
{
if (isset($this->sessionStorage->csrf[$token])) {
unset($this->sessionStorage->csrf[$token]);
return true;
}
return false;
}
}
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