librenms-librenms/app/Http/Middleware/LegacyExternalAuth.php

<?php

namespace App\Http\Middleware;

use App\Models\User;
use Auth;
use Closure;
use LibreNMS\Authentication\LegacyAuth;
use LibreNMS\Config;
use LibreNMS\Exceptions\AuthenticationException;
use Log;

class LegacyExternalAuth
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next, $guard = null)
    {
        if (!Auth::guard($guard)->check() && LegacyAuth::get()->authIsExternal()) {
            $credentials = [
                'username' => LegacyAuth::get()->getExternalUsername(),
                'password' => isset($_SERVER['PHP_AUTH_PW']) ? $_SERVER['PHP_AUTH_PW'] : ''
            ];

            if (!Auth::guard($guard)->attempt($credentials)) {
                $message = ''; // no debug info for now...

                // force user to failure page
                return response(view('auth.external-auth-failed')->with('message', $message));
            }
        }

        return $next($request);
    }
}