cybernetix-lab/moss-harness/security-review

Claude Code and agent skill by cybernetix-lab/moss-harness

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Checking that the SKILL.md file is still in the repository.

Use this skill when adding authentication, handling user input, working with secrets, creating API endpoints, or implementing payment/sensitive features. Provides comprehensive security checklist and patterns.

Install

npx vskill@latest install cybernetix-lab/moss-harness/security-review

SKILL.md

The same SKILL.md was published earlier as khanhhuyenngo985-sys/character-scene-design-skills/security-review.

Security Review Skill

This skill ensures all code follows security best practices and identifies potential vulnerabilities.

When to Activate

  • Implementing authentication or authorization
  • Handling user input or file uploads
  • Creating new API endpoints
  • Working with secrets or credentials
  • Implementing payment features
  • Storing or transmitting sensitive data
  • Integrating third-party APIs

Security Checklist

1. Secrets Management
FAIL: NEVER Do This
typescript
const apiKey = "sk-proj-xxxxx"  // Hardcoded secret
const dbPassword = "password123" // In source code
PASS: ALWAYS Do This
typescript
const apiKey = process.env.OPENAI_API_KEY
const dbUrl = process.env.DATABASE_URL
// Verify secrets exist
if (!apiKey) {
  throw new Error('OPENAI_API_KEY not configured')
}
Verification Steps
  • [ ] No hardcoded API keys, tokens, or passwords
  • [ ] All secrets in environment variables
  • [ ] .env.local in .gitignore
  • [ ] No secrets in git history
  • [ ] Production secrets in hosting platform (Vercel, Railway)
2. Input Validation
Always Validate User Input
typescript
import { z } from 'zod'
// Define validation schema
const CreateUserSchema = z.object({
  email: z.string().email(),
  name: z.string().min(1).max(100),
  age: z.number().int().min(0).max(150)
})
// Validate before processing
export async function createUser(input: unknown) {
  try {
    const validated = CreateUserSchema.parse(input)
    return await db.users.create(validated)
  } catch (error) {
    if (error instanceof z.ZodError) {
      return { success: false, errors: error.errors }
    }
    throw error
  }
}
File Upload Validation
typescript
function validateFileUpload(file: File) {
  // Size check (5MB max)
  const maxSize = 5 * 1024 * 1024
  if (file.size > maxSize) {
    throw new Error('File too large (max 5MB)')
  }
  // Type check
  const allowedTypes = ['image/jpeg', 'image/png', 'image/gif']
  if (!allowedTypes.includes(file.type)) {
    throw new Error('Invalid file type')
  }
  // Extension check
  const allowedExtensions = ['.jpg', '.jpeg', '.png', '.gif']
  const extension = file.name.toLowerCase().match(/\.[^.]+$/)?.[0]
  if (!extension || !allowedExtensions.includes(extension)) {
    throw new Error('Invalid file extension')
  }
  return true
}
Verification Steps
  • [ ] All user inputs validated with schemas
  • [ ] File uploads restricted (size, type, extension)
  • [ ] No direct use of user input in queries
  • [ ] Whitelist validation (not blacklist)
  • [ ] Error messages don't leak sensitive info
3. SQL Injection Prevention
FAIL: NEVER Concatenate SQL
typescript
// DANGEROUS - SQL Injection vulnerability
const query = `SELECT * FROM users WHERE email = '${userEmail}'`
await db.query(query)
PASS: ALWAYS Use Parameterized Queries
typescript
// Safe - parameterized query
const { data } = await supabase
  .from('users')
  .select('*')
  .eq('email', userEmail)
// Or with raw SQL
await db.query(
  'SELECT * FROM users WHERE email = $1',
  [userEmail]
)
Verification Steps
  • [ ] All database queries use parameterized queries
  • [ ] No string concatenation in SQL
  • [ ] ORM/query builder used correctly
  • [ ] Supabase queries properly sanitized
4. Authentication & Authorization
JWT Token Handling
typescript
// FAIL: WRONG: localStorage (vulnerable to XSS)
localStorage.setItem('token', token)
// PASS: CORRECT: httpOnly cookies
res.setHeader('Set-Cookie',
  `token=${token}; HttpOnly; Secure; SameSite=Strict; Max-Age=3600`)
Authorization Checks
typescript
export async function deleteUser(userId: string, requesterId: string) {
  // ALWAYS verify authorization first
  const requester = await db.users.findUnique({
    where: { id: requesterId }
  })
  if (requester.role !== 'admin') {
    return NextResponse.json(
      { error: 'Unauthorized' },
      { status: 403 }
    )
  }
  // Proceed with deletion
  await db.users.delete({ where: { id: userId } })
}
Row Level Security (Supabase)
sql
-- Enable RLS on all tables
ALTER TABLE users ENABLE ROW LEVEL SECURITY;
 
-- Users can only view their own data
CREATE POLICY "Users view own data"
  ON users FOR SELECT
  USING (auth.uid() = id);
 
-- Users can only update their own data
CREATE POLICY "Users update own data"
  ON users FOR UPDATE
  USING (auth.uid() = id);
Verification Steps
  • [ ] Tokens stored in httpOnly cookies (not localStorage)
  • [ ] Authorization checks before sensitive operations
  • [ ] Row Level Security enabled in Supabase
  • [ ] Role-based access control implemented
  • [ ] Session management secure
5. XSS Prevention
Sanitize HTML
typescript
import DOMPurify from 'isomorphic-dompurify'
// ALWAYS sanitize user-provided HTML
function renderUserContent(html: string) {
  const clean = DOMPurify.sanitize(html, {
    ALLOWED_TAGS: ['b', 'i', 'em', 'strong', 'p'],
    ALLOWED_ATTR: []
  })
  return <div dangerouslySetInnerHTML={{ __html: clean }} />
}
Content Security Policy
typescript
// next.config.js
const securityHeaders = [
  {
    key: 'Content-Security-Policy',
    value: `
      default-src 'self';
      script-src 'self' 'unsafe-eval' 'unsafe-inline';
      style-src 'self' 'unsafe-inline';
      img-src 'self' data: https:;
      font-src 'self';
      connect-src 'self' https://api.example.com;
    `.replace(/\s{2,}/g, ' ').trim()
  }
]
Verification Steps
  • [ ] User-provided HTML sanitized
  • [ ] CSP headers configured
  • [ ] No unvalidated dynamic content rendering
  • [ ] React's built-in XSS protection used
6. CSRF Protection
CSRF Tokens
typescript
import { csrf } from '@/lib/csrf'
export async function POST(request: Request) {
  const token = request.headers.get('X-CSRF-Token')
  if (!csrf.verify(token)) {
    return NextResponse.json(
      { error: 'Invalid CSRF token' },
      { status: 403 }
    )
  }
  // Process request
}
SameSite Cookies
typescript
res.setHeader('Set-Cookie',
  `session=${sessionId}; HttpOnly; Secure; SameSite=Strict`)
Verification Steps
  • [ ] CSRF tokens on state-changing operations
  • [ ] SameSite=Strict on all cookies
  • [ ] Double-submit cookie pattern implemented
7. Rate Limiting
API Rate Limiting
typescript
import rateLimit from 'express-rate-limit'
const limiter = rateLimit({
  windowMs: 15 * 60 * 1000, // 15 minutes
  max: 100, // 100 requests per window
  message: 'Too many requests'
})
// Apply to routes
app.use('/api/', limiter)
Expensive Operations
typescript
// Aggressive rate limiting for searches
const searchLimiter = rateLimit({
  windowMs: 60 * 1000, // 1 minute
  max: 10, // 10 requests per minute
  message: 'Too many search requests'
})
app.use('/api/search', searchLimiter)
Verification Steps
  • [ ] Rate limiting on all API endpoints
  • [ ] Stricter limits on expensive operations
  • [ ] IP-based rate limiting
  • [ ] User-based rate limiting (authenticated)
8. Sensitive Data Exposure
Logging
typescript
// FAIL: WRONG: Logging sensitive data
console.log('User login:', { email, password })
console.log('Payment:', { cardNumber, cvv })
// PASS: CORRECT: Redact sensitive data
console.log('User login:', { email, userId })
console.log('Payment:', { last4: card.last4, userId })
Error Messages
typescript
// FAIL: WRONG: Exposing internal details
catch (error) {
  return NextResponse.json(
    { error: error.message, stack: error.stack },
    { status: 500 }
  )
}
// PASS: CORRECT: Generic error messages
catch (error) {
  console.error('Internal error:', error)
  return NextResponse.json(
    { error: 'An error occurred. Please try again.' },
    { status: 500 }
  )
}
Verification Steps
  • [ ] No passwords, tokens, or secrets in logs
  • [ ] Error messages generic for users
  • [ ] Detailed errors only in server logs
  • [ ] No stack traces exposed to users
9. Blockchain Security (Solana)
Wallet Verification
typescript
import { verify } from '@solana/web3.js'
async function verifyWalletOwnership(
  publicKey: string,
  signature: string,
  message: string
) {
  try {
    const isValid = verify(
      Buffer.from(message),
      Buffer.from(signature, 'base64'),
      Buffer.from(publicKey, 'base64')
    )
    return isValid
  } catch (error) {
    return false
  }
}
Transaction Verification
typescript
async function verifyTransaction(transaction: Transaction) {
  // Verify recipient
  if (transaction.to !== expectedRecipient) {
    throw new Error('Invalid recipient')
  }
  // Verify amount
  if (transaction.amount > maxAmount) {
    throw new Error('Amount exceeds limit')
  }
  // Verify user has sufficient balance
  const balance = await getBalance(transaction.from)
  if (balance < transaction.amount) {
    throw new Error('Insufficient balance')
  }
  return true
}
Verification Steps
  • [ ] Wallet signatures verified
  • [ ] Transaction details validated
  • [ ] Balance checks before transactions
  • [ ] No blind transaction signing
10. Dependency Security
Regular Updates
bash
# Check for vulnerabilities
npm audit
 
# Fix automatically fixable issues
npm audit fix
 
# Update dependencies
npm update
 
# Check for outdated packages
npm outdated
Lock Files
bash
# ALWAYS commit lock files
git add package-lock.json
 
# Use in CI/CD for reproducible builds
npm ci  # Instead of npm install
Verification Steps
  • [ ] Dependencies up to date
  • [ ] No known vulnerabilities (npm audit clean)
  • [ ] Lock files committed
  • [ ] Dependabot enabled on GitHub
  • [ ] Regular security updates

Security Testing

Automated Security Tests
typescript
// Test authentication
test('requires authentication', async () => {
  const response = await fetch('/api/protected')
  expect(response.status).toBe(401)
})
// Test authorization
test('requires admin role', async () => {
  const response = await fetch('/api/admin', {
    headers: { Authorization: `Bearer ${userToken}` }
  })
  expect(response.status).toBe(403)
})
// Test input validation
test('rejects invalid input', async () => {
  const response = await fetch('/api/users', {
    method: 'POST',
    body: JSON.stringify({ email: 'not-an-email' })
  })
  expect(response.status).toBe(400)
})
// Test rate limiting
test('enforces rate limits', async () => {
  const requests = Array(101).fill(null).map(() =>
    fetch('/api/endpoint')
  )
  const responses = await Promise.all(requests)
  const tooManyRequests = responses.filter(r => r.status === 429)
  expect(tooManyRequests.length).toBeGreaterThan(0)
})

Pre-Deployment Security Checklist

Before ANY production deployment:

  • [ ] Secrets: No hardcoded secrets, all in env vars
  • [ ] Input Validation: All user inputs validated
  • [ ] SQL Injection: All queries parameterized
  • [ ] XSS: User content sanitized
  • [ ] CSRF: Protection enabled
  • [ ] Authentication: Proper token handling
  • [ ] Authorization: Role checks in place
  • [ ] Rate Limiting: Enabled on all endpoints
  • [ ] HTTPS: Enforced in production
  • [ ] Security Headers: CSP, X-Frame-Options configured
  • [ ] Error Handling: No sensitive data in errors
  • [ ] Logging: No sensitive data logged
  • [ ] Dependencies: Up to date, no vulnerabilities
  • [ ] Row Level Security: Enabled in Supabase
  • [ ] CORS: Properly configured
  • [ ] File Uploads: Validated (size, type)
  • [ ] Wallet Signatures: Verified (if blockchain)

Resources

Remember: Security is not optional. One vulnerability can compromise the entire platform. When in doubt, err on the side of caution.

Security

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  • Model reviewNot runA model review is scheduled for the next rescan.

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