Harden tenant admin auth and photo moderation

app/Http/Controllers/Auth/AuthenticatedSessionController.php

@@ -157,6 +157,10 @@ class AuthenticatedSessionController extends Controller
             return null;
         }
 
+        if (str_starts_with($candidate, '//')) {
+            return null;
+        }
+
         if (str_starts_with($candidate, '/')) {
             return $candidate;
         }
@@ -170,7 +174,7 @@ class AuthenticatedSessionController extends Controller
 
         $appHost = parse_url($request->getSchemeAndHttpHost(), PHP_URL_HOST);
 
-        if ($appHost && ! Str::endsWith($targetHost, $appHost)) {
+        if (! $appHost || ! $this->isAllowedReturnHost($targetHost, $appHost)) {
             return null;
         }
 
@@ -222,7 +226,7 @@ class AuthenticatedSessionController extends Controller
             $scheme = $parsed['scheme'] ?? null;
             $requestHost = parse_url($request->getSchemeAndHttpHost(), PHP_URL_HOST);
 
-            if ($scheme && $host && $requestHost && ! Str::endsWith($host, $requestHost)) {
+            if ($scheme && $host && $requestHost && ! $this->isAllowedReturnHost($host, $requestHost)) {
                 return '/event-admin/dashboard';
             }
 
@@ -265,6 +269,15 @@ class AuthenticatedSessionController extends Controller
         return $decoded;
     }
 
+    private function isAllowedReturnHost(string $targetHost, string $appHost): bool
+    {
+        if ($targetHost === $appHost) {
+            return true;
+        }
+
+        return Str::endsWith($targetHost, '.'.$appHost);
+    }
+
     private function rememberTenantAdminTarget(Request $request, ?string $target): void
     {
         $user = Auth::user();