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fix(cloud): reset lockout on window expiry + constant-time unknown-user path (anti-enumeration)

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유창욱 2026-07-12 00:39:19 +09:00
parent 450c88978f
commit 902bbe93c8
2 changed files with 28 additions and 1 deletions
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16
cloud/src/Auth/AuthController.php
View file

@ -8,6 +8,9 @@ use App\Repository\{UserRepository, AuditRepository};
final class AuthController
{
// A valid Argon2id hash used only to equalize verification timing for unknown users (anti-enumeration).
private const DUMMY_HASH = '$argon2id$v=19$m=65536,t=4,p=1$S25iZnFxVGpGQWRnVFpYYg$8Lorit52NTt4MN/gXR/9xkr9hzFHZvpGWTzJvjqXnCk';
public function __construct(
private UserRepository $users,
private AuditRepository $audit,
@ -20,12 +23,23 @@ final class AuthController
$username = (string)$req->post('username');
$password = (string)$req->post('password');
$u = $this->users->byUsername($username);
if ($u === null) return Response::json(['error' => 'invalid_credentials'], 401);
if ($u === null) {
Password::verify($password, self::DUMMY_HASH); // constant-time-ish: burn equivalent work
return Response::json(['error' => 'invalid_credentials'], 401);
}
if ((int)($u['locked_until'] ?? 0) > $now) {
$this->audit->append($username, 'login_locked', 'auth', [], []);
return Response::json(['error' => 'locked'], 423);
}
// lock window expired -> reset stale failure counter so the user gets a fresh set of attempts
if ((int)($u['locked_until'] ?? 0) !== 0 && (int)$u['locked_until'] <= $now) {
$this->users->clearFailures((int)$u['id']);
$u['failed_attempts'] = 0;
$u['locked_until'] = 0;
}
if (!Password::verify($password, (string)$u['password_hash'])) {
$attempts = (int)($u['failed_attempts'] ?? 0) + 1;
$lock = $attempts >= $this->maxAttempts ? $now + $this->lockSeconds : 0;

13
cloud/tests/AuthControllerTest.php
View file

@ -37,4 +37,17 @@ final class AuthControllerTest extends TestCase
// now locked, even correct password is 423
$this->assertSame(423, $c->login($this->req('alice', 'pw'), new ArraySessionStore(), now: 1000)->status());
}
public function testExpiredLockResetsAttempts(): void {
$repo = $this->users();
$c = new AuthController($repo, new InMemoryAuditRepository(), maxAttempts: 3, lockSeconds: 900);
// lock the account with 3 bad tries at now=1000
for ($i = 0; $i < 3; $i++) $c->login($this->req('alice', 'bad'), new ArraySessionStore(), now: 1000);
// locked_until is now 1000 + 900 = 1900, verify it's locked
$this->assertSame(423, $c->login($this->req('alice', 'pw'), new ArraySessionStore(), now: 1000)->status());
// now at now=2000 (after lock window expires at 1900), login with correct password should succeed
$sess = new ArraySessionStore();
$res = $c->login($this->req('alice', 'pw'), $sess, now: 2000);
$this->assertSame(200, $res->status());
$this->assertSame(1, $sess->get('user_id'));
}
}