Added logging for failed authentication attempts

app/Listeners/LogAuthenticationFailure.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Listeners;
+
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Support\Facades\Log;
+
+class LogAuthenticationFailure
+{
+    /**
+     * Create the event listener.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Handle the event.
+     *
+     * @param  object  $event
+     * @return void
+     */
+    public function handle($event)
+    {
+        Log::alert('SECURITY (login): Detected failed authentication attempt!', [
+            'targetAccountID' => $event->user->id,
+            'sourceIP' => request()->ip(),
+            'matchesAccountLastIP' => request()->ip() == $event->user->originalIP,
+            'sourceUserAgent' => request()->userAgent(),
+        ]);
+    }
+}

app/Providers/EventServiceProvider.php

@@ -2,7 +2,9 @@
 
 namespace App\Providers;
 
+use App\Listeners\LogAuthenticationFailure;
 use App\Listeners\OnUserRegistration;
+use Illuminate\Auth\Events\Failed;
 use Illuminate\Auth\Events\Registered;
 use Illuminate\Auth\Listeners\SendEmailVerificationNotification;
 use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;
@@ -20,6 +22,9 @@ class EventServiceProvider extends ServiceProvider
             SendEmailVerificationNotification::class,
             OnUserRegistration::class
         ],
+        Failed::class => [
+            LogAuthenticationFailure::class
+        ],
         'App\Events\ApplicationApprovedEvent' => [
             'App\Listeners\PromoteUser'
         ],