Rate limit and audit-log 2FA checkpoint verification

app/Http/Controllers/AccountController.php

@@ -6,6 +6,7 @@ use App\Jobs\FollowPipeline\FollowAcceptPipeline;
 use App\Jobs\FollowPipeline\FollowPipeline;
 use App\Jobs\FollowPipeline\FollowRejectPipeline;
 use App\Mail\ConfirmEmail;
+use App\Models\AccountLog;
 use App\Models\EmailVerification;
 use App\Models\Follower;
 use App\Models\FollowRequest;
@@ -521,6 +522,19 @@ class AccountController extends Controller
                 return redirect('/');
             }
 
+            // Audit failed 2FA verification so brute-force attempts at the MFA
+            // layer are visible (the route throttle bounds the rate per user).
+            $log = new AccountLog;
+            $log->user_id = $user->id;
+            $log->item_id = $user->id;
+            $log->item_type = User::class;
+            $log->action = 'auth.2fa.failed';
+            $log->message = '2FA verification failed';
+            $log->link = null;
+            $log->ip_address = $request->ip();
+            $log->user_agent = $request->userAgent();
+            $log->save();
+
             if ($request->session()->has('2fa.attempts')) {
                 $count = (int) $request->session()->get('2fa.attempts');
                 if ($count == 3) {

routes/web.php

@@ -196,7 +196,8 @@ Route::domain(config('pixelfed.domain.app'))->middleware(['validemail', 'twofact
         Route::get('auth/sudo', [AccountController::class, 'confirmPassword'])->name('password.confirm');
         Route::post('auth/sudo', [AccountController::class, 'confirmPasswordStore']);
         Route::get('auth/checkpoint', [AccountController::class, 'twoFactorCheckpoint']);
-        Route::post('auth/checkpoint', [AccountController::class, 'twoFactorVerify']);
+        Route::post('auth/checkpoint', [AccountController::class, 'twoFactorVerify'])
+            ->middleware('throttle:5,15');
 
         Route::get('results', [SearchController::class, 'results']);
         Route::post('visibility', [StatusController::class, 'toggleVisibility']);

tests/Feature/Auth/TwoFactorCheckpointTest.php

@@ -0,0 +1,49 @@
+<?php
+
+use App\Models\AccountLog;
+use App\Models\User;
+use Illuminate\Foundation\Testing\LazilyRefreshDatabase;
+use Illuminate\Support\Facades\Route;
+use PragmaRX\Google2FA\Google2FA;
+
+uses(LazilyRefreshDatabase::class);
+
+/*
+|--------------------------------------------------------------------------
+| 2FA checkpoint rate limiting + audit
+|--------------------------------------------------------------------------
+|
+| The 2FA verify endpoint must be server-side rate limited (so re-login cannot
+| reset an unlimited guess budget) and failed attempts must be audit-logged.
+|
+*/
+
+it('applies throttle middleware to the 2FA verify route', function () {
+    $route = collect(Route::getRoutes())->first(function ($r) {
+        return $r->uri() === 'i/auth/checkpoint' && in_array('POST', $r->methods());
+    });
+
+    expect($route)->not->toBeNull();
+
+    $hasThrottle = collect($route->gatherMiddleware())
+        ->contains(fn ($m) => is_string($m) && str_starts_with($m, 'throttle'));
+
+    expect($hasThrottle)->toBeTrue();
+});
+
+it('audit-logs a failed 2FA verification', function () {
+    $google2fa = new Google2FA;
+    $secret = $google2fa->generateSecretKey();
+
+    $user = User::factory()->create(['2fa_secret' => $secret, '2fa_enabled' => true]);
+    $user->refresh();
+
+    $this->actingAs($user)
+        ->post('/i/auth/checkpoint', ['code' => '000000']);
+
+    expect(
+        AccountLog::where('user_id', $user->id)
+            ->where('action', 'auth.2fa.failed')
+            ->exists()
+    )->toBeTrue();
+});