Added logging for successful authentication attempts

app/Listeners/LogAuthenticationSuccess.php

@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Listeners;
+
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Support\Facades\Log;
+
+class LogAuthenticationSuccess
+{
+    /**
+     * Create the event listener.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        //
+    }
+
+    /**
+     * Handle the event.
+     *
+     * @param  object  $event
+     * @return void
+     */
+    public function handle($event)
+    {
+        Log::info('SECURITY (postauth-pre2fa): Detected successful login attempt', [
+            'accountID' => $event->user->id,
+            'sourceIP' => request()->ip(),
+            'matchesAccountLastIP' => request()->ip() == $event->user->originalIP,
+            'sourceUserAgent' => request()->userAgent(),
+        ]);
+    }
+}