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Laravel XSS Protection Middleware

Laravel Middleware to protect your app against Cross-site scripting (XSS). It sanitizes request input by utilising the Security Core package, and it can sanatize Blade echo statements as well.

PHP 8.2 and higher
Laravel 10 and higher

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Installation

You can install the package via composer:

composer require protonemedia/laravel-xss-protection

You may publish the config file with:

php artisan vendor:publish --tag="xss-protection-config"

Middleware Usage

You may use the ProtoneMedia\LaravelXssProtection\Middleware\XssCleanInput middleware in the route that handles the form submission.

use App\Http\Controllers\CreateAccountController;
use ProtoneMedia\LaravelXssProtection\Middleware\XssCleanInput;

Route::post('account', CreateAccountController::class)->middleware(XssCleanInput::class);

If your app has a lot of forms handled by many different controllers, you could opt to register it as global middleware.

// inside app\Http\Kernel.php

protected $middleware = [
   // ...
   \ProtoneMedia\LaravelXssProtection\Middleware\XssCleanInput::class,
];

If you register the middleware globally, you may exclude requests by using the static skipWhen method. You can add a callback to interact with the request:

XssCleanInput::skipWhen(function (Request $request) {
    return $request->is('admin.*');
});

You can also exclude keys by using the static skipKeyWhen method. This also allows you to interact with the value and request.

XssCleanInput::skipKeyWhen(function (string $key, $value, Request $request) {
    return in_array($key, [
        'current_password',
        'password',
        'password_confirmation',
    ]);
});

Configuration

File uploads

By default, the middleware allows file uploads. However, you may disallow file uploads by changing the middleware.allow_file_uploads configuration key to false.

Blade echo statements

By default, the middleware sanitizes Blade echo statements like {{ $name }}, {{{ $name }}}, and {!! $name !!}. You may allow echo statements by changing the middleware.allow_blade_echoes configuration key to true.

Completely replace malicious input

By default, the middleware transforms malicious input to null. You may configure the middleware to only transform the malicious part by setting the middleware.completely_replace_malicious_input configuration key to false. That way, an input string like hey <script>alert('laravel')</script> will be transformed to hey instead of null.

Terminate request

Instead of transforming malicious input, you may configure the middleware to terminate the request whenever anything malicious has been found. You may do this by setting the middleware.terminate_request_on_malicious_input to true, which will throw an HttpException with status code 403.

Dispatch event

You may configure the middleware to dispatch an event whenever malicious input has been found. Setting the middleware.dispatch_event_on_malicious_input to true will dispatch an ProtoneMedia\LaravelXssProtection\Events\MaliciousInputFound event with the sanitized keys, the original request and the sanitized request.

use Illuminate\Support\Facades\Event;
use ProtoneMedia\LaravelXssProtection\Events\MaliciousInputFound;

Event::listen(function (MaliciousInputFound $event) {
    $event->sanitizedKeys;
    $event->originalRequest;
    $event->sanitizedRequest;
});

Additional configuration for `voku/anti-xss`

As of version 1.6.0, you may provide additional configuration for the voku/anti-xss package. You may do this by filling the middleware.anti_xss key. This is similar to the Laravel Security package, which this package used to rely on.

'anti_xss' => [
    'evil' => [
        'attributes' => ['href'],
        'tags' => ['video'],
    ],

    'replacement' => '*redacted*',
]

Changelog

Please see CHANGELOG for more information about what has changed recently.

Testing

$ composer test

Contributing

Please see CONTRIBUTING for details.

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Security

If you discover any security-related issues, please email code@protone.media instead of using the issue tracker. Please do not email any questions, open an issue if you have a question.

Credits

License

The MIT License (MIT). Please see License File for more information.

Treeware

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