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excalidraw-mcp-sentinel/tests/backend/auth.test.ts
T
newblaccandClaude Opus 4.6 15a5cfcc61 chore: add security tests and SECURITY.md (previously untracked) 
- 9 backend security test files (auth, headers, rate-limit, middleware
  order, smoke, validation, WS auth, integration bootstrap)
- 1 e2e test (clear-preference)
- SECURITY.md policy doc

These files powered the 369-test suite but were never committed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-29 20:03:50 +02:00

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import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import request from 'supertest';
import { initDb, closeDb, setActiveTenant } from '../../src/db.js';
import path from 'path';
import os from 'os';
import fs from 'fs';
let dbPath: string;
let app: any;
const frontendDir = path.join(process.cwd(), 'dist/frontend');
const frontendHtmlPath = path.join(frontendDir, 'index.html');
let originalFrontendHtml: string | null = null;
let hadFrontendHtml = false;
beforeEach(async () => {
dbPath = path.join(os.tmpdir(), `excalidraw-auth-test-${Date.now()}-${Math.random().toString(36).slice(2)}.db`);
initDb(dbPath);
setActiveTenant('default');
hadFrontendHtml = fs.existsSync(frontendHtmlPath);
originalFrontendHtml = hadFrontendHtml ? fs.readFileSync(frontendHtmlPath, 'utf8') : null;
fs.mkdirSync(frontendDir, { recursive: true });
fs.writeFileSync(frontendHtmlPath, '<!doctype html><html><head><title>Test</title></head><body><div id="root"></div></body></html>');
const mod = await import('../../src/server.js');
app = mod.default;
});
afterEach(() => {
delete process.env.EXCALIDRAW_API_KEY;
delete process.env.ALLOWED_ORIGINS;
closeDb();
if (hadFrontendHtml && originalFrontendHtml !== null) {
fs.writeFileSync(frontendHtmlPath, originalFrontendHtml);
} else {
try { fs.unlinkSync(frontendHtmlPath); } catch {}
}
for (const suffix of ['', '-wal', '-shm']) {
try { fs.unlinkSync(dbPath + suffix); } catch {}
}
});
// ─── API Key Auth ───────────────────────────────────────────────────────────
describe('API Key Auth — disabled (no env var)', () => {
it('allows GET /api/elements without API key', async () => {
delete process.env.EXCALIDRAW_API_KEY;
const res = await request(app).get('/api/elements');
expect(res.status).toBe(200);
});
it('allows DELETE /api/elements/clear without API key', async () => {
delete process.env.EXCALIDRAW_API_KEY;
const res = await request(app).delete('/api/elements/clear?confirm=true');
expect(res.status).toBe(200);
});
});
describe('API Key Auth — enabled (EXCALIDRAW_API_KEY set)', () => {
it('rejects GET /api/elements without key → 401', async () => {
process.env.EXCALIDRAW_API_KEY = 'test-secret';
const res = await request(app).get('/api/elements');
expect(res.status).toBe(401);
expect(res.body.success).toBe(false);
});
it('rejects GET /api/elements with wrong key → 401', async () => {
process.env.EXCALIDRAW_API_KEY = 'test-secret';
const res = await request(app)
.get('/api/elements')
.set('X-API-Key', 'wrong-key');
expect(res.status).toBe(401);
});
it('allows GET /api/elements with correct key → 200', async () => {
process.env.EXCALIDRAW_API_KEY = 'test-secret';
const res = await request(app)
.get('/api/elements')
.set('X-API-Key', 'test-secret');
expect(res.status).toBe(200);
});
it('rejects POST /api/elements without key → 401', async () => {
process.env.EXCALIDRAW_API_KEY = 'test-secret';
const res = await request(app)
.post('/api/elements')
.send({ type: 'rectangle', x: 0, y: 0, width: 100, height: 50 });
expect(res.status).toBe(401);
});
it('rejects DELETE /api/elements/clear without key → 401', async () => {
process.env.EXCALIDRAW_API_KEY = 'test-secret';
const res = await request(app).delete('/api/elements/clear?confirm=true');
expect(res.status).toBe(401);
});
it('health endpoint is exempt from auth → 200', async () => {
process.env.EXCALIDRAW_API_KEY = 'test-secret';
const res = await request(app).get('/health');
expect(res.status).toBe(200);
});
it('rejects empty X-API-Key header → 401', async () => {
process.env.EXCALIDRAW_API_KEY = 'test-secret';
const res = await request(app)
.get('/api/elements')
.set('X-API-Key', '');
expect(res.status).toBe(401);
});
});
// ─── MCP → Canvas inter-service auth (trust boundary A) ─────────────────────
// When EXCALIDRAW_API_KEY is set, the canvas REST API must reject requests that
// don't include the key — including any inter-service caller (MCP or other).
// This validates that the canvas enforces auth at its own boundary regardless
// of the caller; the MCP-side fix (forwarding X-API-Key in canvasHeaders) is
// verified by ensuring the canvas correctly accepts/rejects the header.
describe('MCP → Canvas auth boundary: canvas enforces key on all callers', () => {
it('rejects inter-service request with no X-API-Key → 401', async () => {
process.env.EXCALIDRAW_API_KEY = 'inter-service-secret';
const res = await request(app)
.get('/api/elements')
.set('X-Tenant-Id', 'default');
expect(res.status).toBe(401);
});
it('accepts inter-service request with correct X-API-Key → 200', async () => {
process.env.EXCALIDRAW_API_KEY = 'inter-service-secret';
const res = await request(app)
.get('/api/elements')
.set('X-Tenant-Id', 'default')
.set('X-API-Key', 'inter-service-secret');
expect(res.status).toBe(200);
});
it('rejects inter-service request with wrong X-API-Key → 401', async () => {
process.env.EXCALIDRAW_API_KEY = 'inter-service-secret';
const res = await request(app)
.get('/api/elements')
.set('X-Tenant-Id', 'default')
.set('X-API-Key', 'wrong-key');
expect(res.status).toBe(401);
});
});
// ─── CORS ───────────────────────────────────────────────────────────────────
describe('CORS — origin restriction', () => {
it('allows requests with no Origin header', async () => {
const res = await request(app).get('/api/elements');
expect(res.status).toBe(200);
});
it('reflects localhost:3000 as allowed origin', async () => {
const res = await request(app)
.get('/api/elements')
.set('Origin', 'http://localhost:3000');
expect(res.headers['access-control-allow-origin']).toBe('http://localhost:3000');
});
it('reflects 127.0.0.1:3000 as allowed origin', async () => {
const res = await request(app)
.get('/api/elements')
.set('Origin', 'http://127.0.0.1:3000');
expect(res.headers['access-control-allow-origin']).toBe('http://127.0.0.1:3000');
});
it('does NOT reflect untrusted origin in ACAO header', async () => {
const res = await request(app)
.get('/api/elements')
.set('Origin', 'https://evil.com');
const acao = res.headers['access-control-allow-origin'];
expect(acao).not.toBe('https://evil.com');
expect(acao).not.toBe('*');
});
it('allows custom origin from ALLOWED_ORIGINS env var', async () => {
process.env.ALLOWED_ORIGINS = 'http://myapp.local:4000,http://localhost:3000';
const res = await request(app)
.get('/api/elements')
.set('Origin', 'http://myapp.local:4000');
expect(res.headers['access-control-allow-origin']).toBe('http://myapp.local:4000');
});
it('rejects origin not in custom ALLOWED_ORIGINS list', async () => {
process.env.ALLOWED_ORIGINS = 'http://myapp.local:4000';
const res = await request(app)
.get('/api/elements')
.set('Origin', 'http://localhost:3000');
const acao = res.headers['access-control-allow-origin'];
expect(acao).not.toBe('http://localhost:3000');
expect(acao).not.toBe('*');
});
});
describe('validateApiKey — timing-safe comparison', () => {
it('accepts correct key', async () => {
process.env.EXCALIDRAW_API_KEY = 'secure-key-abc123';
const { validateApiKey } = await import('../../src/security.js');
expect(validateApiKey('secure-key-abc123')).toBe(true);
});
it('rejects wrong key', async () => {
process.env.EXCALIDRAW_API_KEY = 'secure-key-abc123';
const { validateApiKey } = await import('../../src/security.js');
expect(validateApiKey('wrong-key')).toBe(false);
});
it('rejects key that is a prefix of the correct key', async () => {
process.env.EXCALIDRAW_API_KEY = 'secure-key-abc123';
const { validateApiKey } = await import('../../src/security.js');
expect(validateApiKey('secure-key-abc')).toBe(false);
});
it('rejects key that is a superstring of the correct key', async () => {
process.env.EXCALIDRAW_API_KEY = 'secure-key-abc123';
const { validateApiKey } = await import('../../src/security.js');
expect(validateApiKey('secure-key-abc123EXTRA')).toBe(false);
});
it('rejects undefined', async () => {
process.env.EXCALIDRAW_API_KEY = 'secure-key-abc123';
const { validateApiKey } = await import('../../src/security.js');
expect(validateApiKey(undefined)).toBe(false);
});
it('allows anything when auth is disabled', async () => {
delete process.env.EXCALIDRAW_API_KEY;
const { validateApiKey } = await import('../../src/security.js');
expect(validateApiKey(undefined)).toBe(true);
expect(validateApiKey('anything')).toBe(true);
});
});
describe('GET / frontend auth bootstrap', () => {
it('injects __EXCALIDRAW_API_KEY__ into the served HTML when auth is enabled', async () => {
process.env.EXCALIDRAW_API_KEY = 'test-secret';
const res = await request(app).get('/');
expect(res.status).toBe(200);
expect(res.text).toContain('window.__EXCALIDRAW_API_KEY__="test-secret"');
});
it('does not inject __EXCALIDRAW_API_KEY__ when auth is disabled', async () => {
delete process.env.EXCALIDRAW_API_KEY;
const res = await request(app).get('/');
expect(res.status).toBe(200);
expect(res.text).not.toContain('__EXCALIDRAW_API_KEY__');
});
it('injects the current EXCALIDRAW_API_KEY value', async () => {
process.env.EXCALIDRAW_API_KEY = 'rotated-secret';
const res = await request(app).get('/');
expect(res.status).toBe(200);
expect(res.text).toContain('window.__EXCALIDRAW_API_KEY__="rotated-secret"');
});
});
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