static laravel basic.auth with username and password in config file

filters.php

<?php
/**
 * change this definition in filters.php.
 * 
 * the code checks if the auth parameters matches the credentials in your config file, if not
 * a WWW-Authenticate Header will be send to the client.
 */
Route::filter('auth.basic', function () {
    $login = false;

    if (isset($_SERVER['PHP_AUTH_USER']) && isset($_SERVER['PHP_AUTH_PW'])) {
        // check credentials from config.
        if (
            $_SERVER['PHP_AUTH_USER'] === Config::get('app.username') && 
            $_SERVER['PHP_AUTH_PW'] === Config::get('app.password')
        ) {
            $login = true;
        }
    }

    if ($login === false) {
        return Response::make('Invalid credentials.', 401, ['WWW-Authenticate' => 'Basic']]);
    }
});

I was looking for this, thanks !

that code was also working for Laravel v5.1.

Here the same code , just mini-syntax update:
Middleware:

/**
 * Handle an incoming request.
 *
 * @param  \Illuminate\Http\Request $request
 * @param  \Closure                 $next
 *
 * @return mixed
 */
public function handle($request, Closure $next)
{
    $logged = false;

    //check if request has authorization header
    if ($request->header('PHP_AUTH_USER', null) && $request->header('PHP_AUTH_PW', null)) {

        $username = $request->header('PHP_AUTH_USER');
        $password = $request->header('PHP_AUTH_PW');

        if ($username === Config::get('app.username') && $password === Config::get('app.password')) 
            $logged = true;

    }

    //user not logged, request authentication
    if ($logged === false) {

        $headers = ['WWW-Authenticate' => 'Basic'];
        return response()->make('Invalid credentials.', 401, $headers);

    } else //if succesfull logged, proceed with request
        return $next($request);

}

great, thank you @Gzerox :)

public function handle($request, Closure $next)
    {
        if ($request->getUser() === Config::get('sso.username') && $request->getPassword() === Config::get('sso.password'))
            return $next($request);

        return new Response('Invalid credentials.', 401, ['WWW-Authenticate' => 'Basic']);

    }

http://github.com/merkeleon/laravel-httpauth

Thanks