phputil-csrf

🔌 CSRF middleware for phputil/router

Installation

Requires phputil/router v0.2.14+

composer require phputil/csrf

Usage

With default options

require_once 'vendor/autoload.php';
use phputil\router\Router;
use function phputil\crsf\crsf; // Step 1: Declare the namespace usage for the function.
$app = new Router();

$app->use( crsf() ); // Step 2: Invoke the function to use it as a middleware.

$app->get( '/', function( $req, $res ) {
    $res->send( 'Hello' );
} );
$app->listen();

Documentation

/**
 * Returns a CSRF middleware.
 *
 * @param array|CsrfOptions $options CSRF options.
 * @param CsrfStrategy $strategy Strategy. By default it uses a cookie-based strategy with default options.
 * @param CsrfStorage $storage Storage. By default it uses a session-based storage with default options.
 *
 * @return callable
 */
function csrf( $options = [], CsrfStrategy $strategy = null, CsrfStorage $storage = null ): callable;

Argument $options (array, default []) can have the following keys:

• disableTokenMasking (bool, default false) indicates if token masking should be disabled.
  • Note: By default, the randomly-generated token is masked through a XOR operation with a random key and then converted to base64.
• disableTokenRenewal (bool, default false) indicates if token renewal should be disabled.
• tokenLength (int, default 20) indicates the desired token length. Note that this is the unmasked token length.

Available Strategies

The following classes are available:

• CookieBasedCsrfStrategy: uses cookies to send and receive the CSRF token. That's the default strategy.
  • Its constructor receives two arguments, both optional:
    • $strategyOptions (array, default []) that can have:
      • "cookieName": the name of the CSRF cookie. By default, it is csrf_token.
    • $cookieOptions (array, default []) that can have the same options as PHP's setcookie().
• HeaderBasedCsrfStrategy: uses HTTP headers to send and receive the CSRF token.
  • Its constructor receives one argument, $strategyOptions (array, default []), that is optional and can have:
    • "requestHeaderName": expected request header. By default it is "X-CSRF-Token".
    • "responseHeaderName": produced response header. By default it is "CSRF-Token".

Note: You can create your own CSRF strategy by implementing the interface CsrfStrategy.

Available Storages

The following classes are available:

• InSessionCsrfStorage: uses PHP's $_SESSION to store the CSRF token in order to compare it later.
  • Its constructor receives one optional argument, $sessionKey (string), which is the key stored in the $_SESSION variable. By default it is csrf.

Note: You can create your own CSRF storage by implementing the interface CsrfStorage.

License

MIT © Thiago Delgado Pinto