gilbitron / easycsrf
A simple, standalone CSRF protection library
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Requires
- php: >=7.3
Requires (Dev)
- phpunit/phpunit: ^9
README
EasyCSRF
EasyCSRF is a simple, standalone CSRF protection library written in PHP. It can be used to protect your forms from Cross Site Request Forgery attacks.
Requirements
- PHP 7.3+
Install
Install via composer:
composer require gilbitron/easycsrf
Run composer install
then use as normal:
require 'vendor/autoload.php'; $sessionProvider = new EasyCSRF\NativeSessionProvider(); $easyCSRF = new EasyCSRF\EasyCSRF($sessionProvider);
Usage
To use EasyCSRF first you need to generate a token:
$sessionProvider = new EasyCSRF\NativeSessionProvider(); $easyCSRF = new EasyCSRF\EasyCSRF($sessionProvider); $token = $easyCSRF->generate('my_token');
You then include this token with any forms you create:
<form> ... <input type="hidden" name="token" value="<?php echo $token; ?>"> ... </form>
Then before you do any data processing, you check the token is valid:
use EasyCSRF\Exceptions\InvalidCsrfTokenException; try { $easyCSRF->check('my_token', $_POST['token']); } catch(InvalidCsrfTokenException $e) { echo $e->getMessage(); }
Token Expiration
You can set a time limit on tokens by passing a timespan (in seconds) to the check method. Tokens older than the timespan will not be valid.
// Example 1 hour expiration $easyCSRF->check('my_token', $_POST['token'], 60 * 60);
Reusable Tokens
Tokens can be made reusable and not one-time only (useful for ajax-heavy requests).
// Make token reusable $easyCSRF->check('my_token', $_POST['token'], null, true);
Custom SessionProvider
Your app might use a third party library for managing sessions, or you may want to store tokens somewhere other
than $_SESSION (as the NativeSessionProvider
does). In this case you can create a custom SessionProvider
and use that when instantiating EasyCSRF.
<?php use EasyCSRF\Interfaces\SessionProvider; class CustomSessionProvider implements SessionProvider { /** * Get a session value. * * @param string $key * @return mixed */ public function get($key) { // Return your stored data } /** * Set a session value. * * @param string $key * @param mixed $value * @return void */ public function set($key, $value) { // Store your data } }
$sessionProvider = new CustomSessionProvider(); $easyCSRF = new EasyCSRF\EasyCSRF($sessionProvider);
Credits
EasyCSRF was created by Gilbert Pellegrom from Dev7studios. Released under the MIT license.