EventSnap/e2e/specs/07-adversarial/auth-tampering.spec.ts

/**
 * Phase 2 adversarial — JWT forgery, brute-force, and password attacks.
 *
 * The JWT secret is in docker-compose.test.yml as a fixed value — these
 * tests do NOT try to forge tokens using that secret (that would only
 * prove HS256 works). Instead they assert the *failure* paths: alg:none,
 * tampered signature, expired sessions, wrong role.
 */
import { test, expect } from '../../fixtures/test';

const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';

/** RFC-4648 base64url with no padding. */
function b64u(s: string) {
  return Buffer.from(s).toString('base64').replace(/=+$/, '').replace(/\+/g, '-').replace(/\//g, '_');
}

test.describe('Adversarial — JWT', () => {
  test('alg:none token claiming admin role is rejected', async () => {
    const header = b64u(JSON.stringify({ alg: 'none', typ: 'JWT' }));
    const payload = b64u(JSON.stringify({
      sub: '00000000-0000-0000-0000-000000000000',
      role: 'admin',
      event_id: '00000000-0000-0000-0000-000000000000',
      exp: Math.floor(Date.now() / 1000) + 3600,
    }));
    const token = `${header}.${payload}.`;
    const res = await fetch(`${BASE}/api/v1/admin/config`, {
      headers: { Authorization: `Bearer ${token}` },
    });
    expect(res.status).toBe(401);
  });

  test('JWT with valid structure but bogus signature is rejected', async ({ guest }) => {
    const g = await guest('SigForge');
    const parts = g.jwt.split('.');
    // Replace the signature with random bytes of the same length.
    const fakeSig = parts[2].split('').reverse().join('');
    const tampered = `${parts[0]}.${parts[1]}.${fakeSig}`;
    const res = await fetch(`${BASE}/api/v1/me/context`, {
      headers: { Authorization: `Bearer ${tampered}` },
    });
    expect(res.status).toBe(401);
  });

  test('JWT with payload-tampered role=admin (re-encoded payload, original signature) is rejected', async ({ guest }) => {
    const g = await guest('RolePromote');
    const parts = g.jwt.split('.');
    const original = JSON.parse(Buffer.from(parts[1], 'base64url').toString());
    const escalated = { ...original, role: 'admin' };
    const newPayload = b64u(JSON.stringify(escalated));
    const tampered = `${parts[0]}.${newPayload}.${parts[2]}`;
    const res = await fetch(`${BASE}/api/v1/admin/config`, {
      headers: { Authorization: `Bearer ${tampered}` },
    });
    // Signature won't match the new payload → middleware must return 401, not 403.
    expect(res.status).toBe(401);
  });

  test('JWT for a session that was deleted (logout) is rejected', async ({ guest, api }) => {
    const g = await guest('LoggedOut');
    await api.logout(g.jwt);
    const res = await fetch(`${BASE}/api/v1/me/context`, {
      headers: { Authorization: `Bearer ${g.jwt}` },
    });
    expect(res.status).toBe(401);
  });

  test('Authorization header without "Bearer " prefix is rejected', async ({ guest }) => {
    const g = await guest('NoBearer');
    const res = await fetch(`${BASE}/api/v1/me/context`, {
      headers: { Authorization: g.jwt },
    });
    expect([401, 403]).toContain(res.status);
  });

  test('missing Authorization header on protected route returns 401', async () => {
    const res = await fetch(`${BASE}/api/v1/me/context`);
    expect(res.status).toBe(401);
  });
});

test.describe('Adversarial — PIN brute-force', () => {
  test('sequential wrong-PIN attempts lock the account after 3 attempts', async ({ guest }) => {
    const g = await guest('Brute');
    const wrong = g.pin === '0000' ? '1111' : '0000';

    // Do them serially so the failed_pin_attempts counter increments
    // monotonically. Parallel attempts race and may never accumulate to 3 in
    // the current handler implementation — that's a separate finding.
    const statuses: number[] = [];
    for (let i = 0; i < 4; i++) {
      const r = await fetch(`${BASE}/api/v1/recover`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ display_name: g.displayName, pin: wrong }),
      });
      statuses.push(r.status);
    }
    // First three are 401, fourth (or later) is 429.
    expect(statuses.filter((s) => s === 200)).toHaveLength(0);
    expect(statuses.some((s) => s === 429)).toBe(true);

    // Now even the correct PIN fails until lockout expires.
    const correct = await fetch(`${BASE}/api/v1/recover`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ display_name: g.displayName, pin: g.pin }),
    });
    expect(correct.status).toBe(429);
  });

  test('parallel wrong-PIN attempts may NOT all hit lockout (race-condition finding)', async ({ guest }) => {
    const g = await guest('BruteParallel');
    const wrong = g.pin === '0000' ? '1111' : '0000';

    const attempts = await Promise.all(
      Array.from({ length: 10 }, () =>
        fetch(`${BASE}/api/v1/recover`, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ display_name: g.displayName, pin: wrong }),
        })
      )
    );
    const statuses = attempts.map((r) => r.status);
    expect(statuses.filter((s) => s === 200)).toHaveLength(0);
    // Documented behavior: lockout counter may race so not every status is 429.
    // Critical invariant: no attempt succeeded.
    if (!statuses.some((s) => s === 429)) {
      console.warn('[finding] PIN-attempt counter races under parallel requests — none hit lockout.');
    }
  });
});

test.describe('Adversarial — admin password brute-force', () => {
  test('repeated wrong passwords do NOT lock the admin (documented finding)', async () => {
    // The admin login handler does not currently implement lockout. This test
    // documents the behavior so any future change is intentional.
    const attempts = await Promise.all(
      Array.from({ length: 10 }, () =>
        fetch(`${BASE}/api/v1/admin/login`, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({ password: 'wrong-' + Math.random() }),
        })
      )
    );
    const statuses = attempts.map((r) => r.status);
    expect(statuses.every((s) => s === 401)).toBe(true);
    console.warn('[finding] /admin/login has no rate-limit or lockout — bcrypt cost is the only defense.');
  });
});