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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()
{
return bin2hex(random_bytes(30));
}
/**
* Generate and store a one-time CSRF token
*
* @access public
* @return string Random token
*/
public function getCSRFToken()
{
return $this->createSessionToken('csrf');
}
/**
* Generate and store a reusable CSRF token
*
* @access public
* @return string
*/
public function getReusableCSRFToken()
{
return $this->createSessionToken('pcsrf');
}
/**
* 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)
{
$tokens = session_get('csrf');
if (isset($tokens[$token])) {
unset($tokens[$token]);
session_set('csrf', $tokens);
return true;
}
return false;
}
public function validateReusableCSRFToken($token)
{
$tokens = session_get('pcsrf');
if (isset($tokens[$token])) {
return true;
}
return false;
}
protected function createSessionToken($key)
{
if (! session_exists($key)) {
session_set($key, []);
}
$nonce = self::getToken();
session_merge($key, [$nonce => true]);
return $nonce;
}
}
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