Credential Stuffing in Laravel with Cockroachdb

Credential stuffing is an automated brute-force style attack in which attackers use lists of previously breached username and password pairs to gain unauthorized access. When Laravel is the application framework and CockroachDB is the persistence layer, the risk is shaped by how authentication logic is implemented and how the database is queried.

Laravel’s default authentication scaffolding, including the built-in login controllers and password reset flows, relies on Eloquent or query builder interactions with the database. If rate limiting is not enforced at the route or middleware level, an attacker can submit many credentials against the login endpoint without meaningful throttling. CockroachDB, while strongly consistent and horizontally scalable, does not inherently prevent high volumes of failed login attempts; it simply returns query results as requested by the application.

A common insecure pattern is querying by username only and then verifying the password in PHP without constant-time comparison. For example, using a simple find by username and then checking the password hash with a non-constant routine can leak timing information and make brute-force or enumeration feasible. Additionally, if the application does not lock or throttle accounts after repeated failures, attackers can iterate over credentials at scale without triggering defenses.

Because CockroachDB supports distributed SQL, queries may touch multiple nodes; however, this does not change how Laravel constructs queries. Developers must still guard against injection, enumeration, and abuse at the application layer. Without proper input validation and authentication hardening, the combination of Laravel and CockroachDB can expose an API or web interface to credential stuffing, regardless of the underlying database’s resilience characteristics.

middleBrick scans this attack surface by checking authentication mechanisms, input validation, and rate limiting as part of its 12 security checks. It can identify whether login endpoints are vulnerable to excessive attempts, whether responses reveal user existence, and whether protections such as account lockout or CAPTCHA are in place.

Remediation focuses on secure authentication patterns, constant-time password verification, and robust rate limiting. Below are concrete Laravel examples that work safely with CockroachDB.

1. Use Laravel’s built-in authentication guards with throttling

Ensure login routes are protected by Laravel’s built-in rate limiter. In app/Providers/RouteServiceProvider.php, you can customize the throttle middleware for authentication:

// app/Providers/RouteServiceProvider.php
protected function mapWebRoutes()
{
    Route::middleware('web')
         ->group(base_path('routes/web.php'));
}

// In routes/web.php, apply throttle to login routes
Route::post('login', [LoginController::class, 'login'])
    ->middleware('throttle:5,1'); // 5 attempts per minute

2. Constant-time password verification

Always use Laravel’s Hash::check or Hash::needsRehash to verify passwords. These functions use PHP’s password_verify, which is designed to be constant-time against timing attacks:

// app/Http/Controllers/Auth/LoginController.php
use Illuminate\Support\Facades\Hash;

public function login(Request $request)
{
    $request->validate([
        'email' => 'required|email',
        'password' => 'required',
    ]);

    $user = \App\Models\User::where('email', $request->email)->first();

    if (! $user || ! Hash::check($request->password, $user->password)) {
        // Use a generic message and a dummy hash to prevent user enumeration
        Hash::make('dummy');
        return back()->withErrors(['email' => 'Invalid credentials.']);
    }

    // Proceed with login
    return redirect()->intended(route('dashboard'));
}

3. Parameterized queries to prevent injection

When interacting with CockroachDB via Laravel’s query builder or Eloquent, always use parameter binding to avoid injection. Laravel’s query builder automatically parameterizes inputs, but avoid concatenating raw values:

// Safe query using Eloquent
$user = \App\Models\User::where('email', $email)->first();

// Safe query using DB facade with bindings
$user = DB::select('select * from users where email = ?', [$email]);

// Unsafe pattern to avoid: concatenating values into SQL strings
// $user = DB::select("select * from users where email = '$email'");

4. Secure schema and indexes in CockroachDB

Define your users table with strong constraints and indexes that support efficient, safe lookups. This example uses valid CockroachDB SQL executed via Laravel migrations:

// database/migrations/xxxx_xx_xx_create_users_table.php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Support\Facades\Schema;

class CreateUsersTable extends Migration
{
    public function up()
    {
        Schema::create('users', function ($table) {
            $table->uuid('id')->primary();
            $table->string('email')->unique();
            $table->string('password');
            $table->timestamps();
        });

        // Ensure index on email for fast, safe lookups
        $this->command->getConnection()->getPdo();
        DB::statement('CREATE INDEX IF NOT EXISTS idx_users_email ON users (email)');
    }

    public function down()
    {
        Schema::dropIfExists('users');
    }
}

5. Monitor and enforce lockout or delays

Implement a lightweight failed login tracker to enforce progressive delays or temporary lockouts. Store attempts in a dedicated table keyed by IP or user identifier:

// Example schema for failed_logins table
Schema::create('failed_logins', function ($table) {
    $table->id();
    $table->string('identifier'); // email or IP
    $table->integer('attempts')->default(0);
    $table->timestamp('last_attempt_at')->nullable();
    $table->timestamps();
});

// In login logic, increment and check
$record = FailedLogin::updateOrInsert(
    ['identifier' => $identifier],
    [
        'attempts' => DB::raw('attempts + 1'),
        'last_attempt_at' => now(),
    ]
);

if ($record->attempts >= 10) {
    // Enforce a delay or require captcha
    $delay = now()->diffInSeconds($record->last_attempt_at, false);
    if ($delay < 300) {
        return back()->withErrors(['email' => 'Too many attempts. Try again later.']);
    } else {
        $record->attempts = 0;
        $record->save();
    }
}

These patterns reduce the effectiveness of credential stuffing by ensuring that authentication checks are resilient to enumeration, timing attacks, and high-volume abuse while remaining compatible with CockroachDB’s distributed nature.