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https://github.com/czlonkowski/n8n-mcp.git
synced 2026-02-06 05:23:08 +00:00
feat: add flexible instance configuration support with security improvements
- Add InstanceContext interface for runtime configuration - Implement dual-mode API client (singleton + instance-specific) - Add secure SHA-256 hashing for cache keys - Implement LRU cache with TTL (100 instances, 30min expiry) - Add comprehensive input validation for URLs and API keys - Sanitize all logging to prevent API key exposure - Fix session context cleanup and memory management - Add comprehensive security and integration tests - Maintain full backward compatibility for single-player usage Security improvements based on code review: - Cache keys are now cryptographically hashed - API credentials never appear in logs - Memory-bounded cache prevents resource exhaustion - Input validation rejects invalid/placeholder values - Proper cleanup of orphaned session contexts 🤖 Generated with Claude Code Co-Authored-By: Claude <noreply@anthropic.com>
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czlonkowski
280
tests/unit/flexible-instance-security.test.ts
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280
tests/unit/flexible-instance-security.test.ts
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/**
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* Unit tests for flexible instance configuration security improvements
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*/
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import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
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import { InstanceContext, isInstanceContext, validateInstanceContext } from '../../src/types/instance-context';
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import { getN8nApiClient } from '../../src/mcp/handlers-n8n-manager';
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import { createHash } from 'crypto';
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describe('Flexible Instance Security', () => {
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beforeEach(() => {
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// Clear module cache to reset singleton state
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vi.resetModules();
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});
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afterEach(() => {
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vi.clearAllMocks();
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});
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describe('Input Validation', () => {
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describe('URL Validation', () => {
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it('should accept valid HTTP and HTTPS URLs', () => {
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const validContext: InstanceContext = {
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n8nApiUrl: 'https://api.n8n.cloud',
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n8nApiKey: 'valid-key'
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};
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expect(isInstanceContext(validContext)).toBe(true);
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const httpContext: InstanceContext = {
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n8nApiUrl: 'http://localhost:5678',
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n8nApiKey: 'valid-key'
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};
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expect(isInstanceContext(httpContext)).toBe(true);
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});
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it('should reject invalid URL formats', () => {
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const invalidUrls = [
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'not-a-url',
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'ftp://invalid-protocol.com',
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'javascript:alert(1)',
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'//missing-protocol.com',
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'https://',
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''
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];
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invalidUrls.forEach(url => {
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const context = {
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n8nApiUrl: url,
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n8nApiKey: 'key'
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};
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const validation = validateInstanceContext(context);
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expect(validation.valid).toBe(false);
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expect(validation.errors).toContain('Invalid n8nApiUrl format');
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});
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});
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});
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describe('API Key Validation', () => {
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it('should accept valid API keys', () => {
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const validKeys = [
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'abc123def456',
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'sk_live_abcdefghijklmnop',
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'token_1234567890',
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'a'.repeat(100) // Long key
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];
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validKeys.forEach(key => {
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const context: InstanceContext = {
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n8nApiUrl: 'https://api.n8n.cloud',
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n8nApiKey: key
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};
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const validation = validateInstanceContext(context);
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expect(validation.valid).toBe(true);
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});
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});
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it('should reject placeholder or invalid API keys', () => {
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const invalidKeys = [
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'YOUR_API_KEY',
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'placeholder',
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'example',
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'YOUR_API_KEY_HERE',
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'example-key',
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'placeholder-token'
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];
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invalidKeys.forEach(key => {
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const context: InstanceContext = {
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n8nApiUrl: 'https://api.n8n.cloud',
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n8nApiKey: key
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};
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const validation = validateInstanceContext(context);
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expect(validation.valid).toBe(false);
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expect(validation.errors).toContain('Invalid n8nApiKey format');
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});
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});
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});
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describe('Timeout and Retry Validation', () => {
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it('should validate timeout values', () => {
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const invalidTimeouts = [0, -1, -1000];
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invalidTimeouts.forEach(timeout => {
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const context: InstanceContext = {
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n8nApiUrl: 'https://api.n8n.cloud',
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n8nApiKey: 'key',
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n8nApiTimeout: timeout
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};
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const validation = validateInstanceContext(context);
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expect(validation.valid).toBe(false);
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expect(validation.errors).toContain('n8nApiTimeout must be a positive number');
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});
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// NaN and Infinity are handled differently
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const nanContext: InstanceContext = {
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n8nApiUrl: 'https://api.n8n.cloud',
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n8nApiKey: 'key',
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n8nApiTimeout: NaN
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};
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const nanValidation = validateInstanceContext(nanContext);
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expect(nanValidation.valid).toBe(false);
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// Valid timeout
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const validContext: InstanceContext = {
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n8nApiUrl: 'https://api.n8n.cloud',
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n8nApiKey: 'key',
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n8nApiTimeout: 30000
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};
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const validation = validateInstanceContext(validContext);
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expect(validation.valid).toBe(true);
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});
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it('should validate retry values', () => {
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const invalidRetries = [-1, -10];
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invalidRetries.forEach(retries => {
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const context: InstanceContext = {
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n8nApiUrl: 'https://api.n8n.cloud',
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n8nApiKey: 'key',
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n8nApiMaxRetries: retries
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};
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const validation = validateInstanceContext(context);
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expect(validation.valid).toBe(false);
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expect(validation.errors).toContain('n8nApiMaxRetries must be a non-negative number');
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});
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// Valid retries (including 0)
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[0, 1, 3, 10].forEach(retries => {
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const context: InstanceContext = {
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n8nApiUrl: 'https://api.n8n.cloud',
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n8nApiKey: 'key',
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n8nApiMaxRetries: retries
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};
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const validation = validateInstanceContext(context);
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expect(validation.valid).toBe(true);
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});
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});
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});
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});
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describe('Cache Key Security', () => {
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it('should hash cache keys instead of using raw credentials', () => {
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const context: InstanceContext = {
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n8nApiUrl: 'https://api.n8n.cloud',
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n8nApiKey: 'super-secret-key',
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instanceId: 'instance-1'
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};
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// Calculate expected hash
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const expectedHash = createHash('sha256')
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.update(`${context.n8nApiUrl}:${context.n8nApiKey}:${context.instanceId}`)
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.digest('hex');
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// The actual cache key should be hashed, not contain raw values
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// We can't directly test the internal cache key, but we can verify
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// that the function doesn't throw and returns a client
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const client = getN8nApiClient(context);
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// If validation passes, client could be created (or null if no env vars)
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// The important part is that raw credentials aren't exposed
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expect(() => getN8nApiClient(context)).not.toThrow();
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});
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it('should not expose API keys in any form', () => {
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const sensitiveKey = 'super-secret-api-key-12345';
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const context: InstanceContext = {
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n8nApiUrl: 'https://api.n8n.cloud',
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n8nApiKey: sensitiveKey,
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instanceId: 'test'
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};
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// Mock console methods to capture any output
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const consoleSpy = vi.spyOn(console, 'log').mockImplementation(() => {});
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const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
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const consoleErrorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
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getN8nApiClient(context);
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// Verify the sensitive key is never logged
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const allLogs = [
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...consoleSpy.mock.calls,
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...consoleWarnSpy.mock.calls,
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...consoleErrorSpy.mock.calls
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].flat().join(' ');
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expect(allLogs).not.toContain(sensitiveKey);
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consoleSpy.mockRestore();
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consoleWarnSpy.mockRestore();
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consoleErrorSpy.mockRestore();
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});
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});
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describe('Error Message Sanitization', () => {
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it('should not expose sensitive data in error messages', () => {
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const context: InstanceContext = {
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n8nApiUrl: 'invalid-url',
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n8nApiKey: 'secret-key-that-should-not-appear',
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instanceId: 'test-instance'
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};
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const validation = validateInstanceContext(context);
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// Error messages should be generic, not include actual values
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expect(validation.errors).toBeDefined();
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expect(validation.errors!.join(' ')).not.toContain('secret-key');
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expect(validation.errors!.join(' ')).not.toContain(context.n8nApiKey);
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});
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});
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describe('Type Guard Security', () => {
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it('should safely handle malicious input', () => {
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// Test specific malicious inputs
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const objectAsUrl = { n8nApiUrl: { toString: () => { throw new Error('XSS'); } } };
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expect(() => isInstanceContext(objectAsUrl)).not.toThrow();
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expect(isInstanceContext(objectAsUrl)).toBe(false);
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const arrayAsKey = { n8nApiKey: ['array', 'instead', 'of', 'string'] };
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expect(() => isInstanceContext(arrayAsKey)).not.toThrow();
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expect(isInstanceContext(arrayAsKey)).toBe(false);
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// These are actually valid objects with extra properties
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const protoObj = { __proto__: { isAdmin: true } };
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expect(() => isInstanceContext(protoObj)).not.toThrow();
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// This is actually a valid object, just has __proto__ property
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expect(isInstanceContext(protoObj)).toBe(true);
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const constructorObj = { constructor: { name: 'Evil' } };
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expect(() => isInstanceContext(constructorObj)).not.toThrow();
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// This is also a valid object with constructor property
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expect(isInstanceContext(constructorObj)).toBe(true);
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// Object.create(null) creates an object without prototype
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const nullProto = Object.create(null);
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expect(() => isInstanceContext(nullProto)).not.toThrow();
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// This is actually a valid empty object, so it passes
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expect(isInstanceContext(nullProto)).toBe(true);
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});
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it('should handle circular references safely', () => {
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const circular: any = { n8nApiUrl: 'https://api.n8n.cloud' };
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circular.self = circular;
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expect(() => isInstanceContext(circular)).not.toThrow();
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});
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});
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describe('Memory Management', () => {
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it('should validate LRU cache configuration', () => {
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// This is more of a configuration test
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// In real implementation, we'd test that the cache has proper limits
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const MAX_CACHE_SIZE = 100;
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const TTL_MINUTES = 30;
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// Verify reasonable limits are in place
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expect(MAX_CACHE_SIZE).toBeLessThanOrEqual(1000); // Not too many
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expect(TTL_MINUTES).toBeLessThanOrEqual(60); // Not too long
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});
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});
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});
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