NTLM Authentication Library?

One possible solution is to use the "php-ntlm" package, which provides a simple way to authenticate with NTLM in PHP. Here's how you can use it in Laravel:

1. Install the package using Composer:

composer require php-ntlm/php-ntlm

1. Create a new middleware class in your Laravel application. This middleware will handle the NTLM authentication process. You can generate the middleware using the following command:

php artisan make:middleware NtlmAuthMiddleware

1. Open the generated NtlmAuthMiddleware class and update the handle method with the following code:

use Ntlm\Ntlm;

public function handle($request, Closure $next)
{
    $ntlm = new Ntlm();
    
    if (!$ntlm->isAuthenticated()) {
        return $ntlm->challenge();
    }
    
    return $next($request);
}

1. Register the middleware in the app/Http/Kernel.php file. Add the following line to the $routeMiddleware array:

'ntlm' => \App\Http\Middleware\NtlmAuthMiddleware::class,

1. Now you can apply the ntlm middleware to any routes or controllers that require NTLM authentication. For example, in your routes file:

Route::group(['middleware' => 'ntlm'], function () {
    // Routes that require NTLM authentication
});

This solution uses the "php-ntlm" package to handle the NTLM authentication process. The middleware checks if the user is authenticated using NTLM, and if not, it sends a challenge response to the client. If the user is authenticated, the middleware allows the request to proceed.

Note: This solution assumes that you have already configured your server to support NTLM authentication.