zai-org/synapse/security-auditor

// ❌ BAD: No authorization check
app.delete('/api/posts/:id', async (req, res) => {
  await db.post.delete({ where: { id: req.params.id } })
  res.json({ success: true })
})
// ✅ GOOD: Verify ownership
app.delete('/api/posts/:id', authenticate, async (req, res) => {
  const post = await db.post.findUnique({ where: { id: req.params.id } })
  if (!post) return res.status(404).json({ error: 'Not found' })
  if (post.authorId !== req.user.id && req.user.role !== 'admin') {
    return res.status(403).json({ error: 'Forbidden' })
  }
  await db.post.delete({ where: { id: req.params.id } })
  res.json({ success: true })
})

// ❌ BAD: Storing plaintext passwords
await db.user.create({ data: { password: req.body.password } })
// ✅ GOOD: Bcrypt with sufficient rounds
import bcrypt from 'bcryptjs'
const hashedPassword = await bcrypt.hash(req.body.password, 12)
await db.user.create({ data: { password: hashedPassword } })

// ❌ BAD: SQL injection vulnerable
const query = `SELECT * FROM users WHERE email = '${email}'`
// ✅ GOOD: Parameterized queries
const user = await db.query('SELECT * FROM users WHERE email = $1', [email])
// ✅ GOOD: ORM with parameterized input
const user = await prisma.user.findUnique({ where: { email } })

// ❌ BAD: Command injection
const result = exec(`ls ${userInput}`)
// ✅ GOOD: Use execFile with argument array
import { execFile } from 'child_process'
execFile('ls', [sanitizedPath], callback)

// ❌ BAD: dangerouslySetInnerHTML with user input
<div dangerouslySetInnerHTML={{ __html: userComment }} />
// ✅ GOOD: Sanitize HTML
import DOMPurify from 'isomorphic-dompurify'
<div dangerouslySetInnerHTML={{ __html: DOMPurify.sanitize(userComment) }} />
// ✅ BEST: Render as text (React auto-escapes)
<div>{userComment}</div>

// next.config.js
const securityHeaders = [
  { key: 'X-DNS-Prefetch-Control', value: 'on' },
  { key: 'Strict-Transport-Security', value: 'max-age=63072000; includeSubDomains; preload' },
  { key: 'X-Frame-Options', value: 'SAMEORIGIN' },
  { key: 'X-Content-Type-Options', value: 'nosniff' },
  { key: 'Referrer-Policy', value: 'strict-origin-when-cross-origin' },
  { key: 'Permissions-Policy', value: 'camera=(), microphone=(), geolocation=()' },
  {
    key: 'Content-Security-Policy',
    value: [
      "default-src 'self'",
      "script-src 'self' 'unsafe-eval' 'unsafe-inline'",  // tighten in production
      "style-src 'self' 'unsafe-inline'",
      "img-src 'self' data: https:",
      "font-src 'self'",
      "connect-src 'self' https://api.example.com",
      "frame-ancestors 'none'",
      "base-uri 'self'",
      "form-action 'self'",
    ].join('; '),
  },
]
module.exports = {
  async headers() {
    return [{ source: '/(.*)', headers: securityHeaders }]
  },
}

import { z } from 'zod'
const userSchema = z.object({
  email: z.string().email().max(255),
  password: z.string().min(8).max(128),
  name: z.string().min(1).max(100).regex(/^[a-zA-Z\s'-]+$/),
  age: z.number().int().min(13).max(150).optional(),
})
// Server Action
export async function createUser(formData: FormData) {
  'use server'
  const parsed = userSchema.safeParse({
    email: formData.get('email'),
    password: formData.get('password'),
    name: formData.get('name'),
  })
  if (!parsed.success) {
    return { error: parsed.error.flatten() }
  }
  // Safe to use parsed.data
}

const ALLOWED_TYPES = ['image/jpeg', 'image/png', 'image/webp']
const MAX_SIZE = 5 * 1024 * 1024 // 5MB
export async function uploadFile(formData: FormData) {
  'use server'
  const file = formData.get('file') as File
  if (!file || file.size === 0) return { error: 'No file' }
  if (!ALLOWED_TYPES.includes(file.type)) return { error: 'Invalid file type' }
  if (file.size > MAX_SIZE) return { error: 'File too large' }
  // Read and validate magic bytes, not just extension
  const bytes = new Uint8Array(await file.arrayBuffer())
  if (!validateMagicBytes(bytes, file.type)) return { error: 'File content mismatch' }
}

import { SignJWT, jwtVerify } from 'jose'
const secret = new TextEncoder().encode(process.env.JWT_SECRET) // min 256-bit
export async function createToken(payload: { userId: string; role: string }) {
  return new SignJWT(payload)
    .setProtectedHeader({ alg: 'HS256' })
    .setIssuedAt()
    .setExpirationTime('15m')  // Short-lived access tokens
    .setAudience('your-app')
    .setIssuer('your-app')
    .sign(secret)
}
export async function verifyToken(token: string) {
  try {
    const { payload } = await jwtVerify(token, secret, {
      algorithms: ['HS256'],
      audience: 'your-app',
      issuer: 'your-app',
    })
    return payload
  } catch {
    return null
  }
}

cookies().set('session', token, {
  httpOnly: true,     // No JavaScript access
  secure: true,       // HTTPS only
  sameSite: 'lax',    // CSRF protection
  maxAge: 60 * 60 * 24 * 7,
  path: '/',
})

import { Ratelimit } from '@upstash/ratelimit'
import { Redis } from '@upstash/redis'
const ratelimit = new Ratelimit({
  redis: Redis.fromEnv(),
  limiter: Ratelimit.slidingWindow(10, '10 s'),
})
// In middleware or route handler
const ip = request.headers.get('x-forwarded-for') ?? '127.0.0.1'
const { success, remaining } = await ratelimit.limit(ip)
if (!success) {
  return NextResponse.json({ error: 'Too many requests' }, { status: 429 })
}

// ❌ BAD
const API_KEY = 'sk-1234567890abcdef'
// ✅ GOOD
const API_KEY = process.env.API_KEY
if (!API_KEY) throw new Error('API_KEY not configured')

# Regular audit
npm audit
npm audit fix
 
# Check for known vulnerabilities
npx better-npm-audit audit
 
# Keep dependencies updated
npx npm-check-updates -u

## Security Audit Report
 
### Critical (Must Fix)
1. **[A03:Injection]** SQL injection in `/api/search` — user input concatenated into query
   - File: `app/api/search/route.ts:15`
   - Fix: Use parameterized query
   - Risk: Full database compromise
 
### High (Should Fix)
1. **[A01:Access Control]** Missing auth check on DELETE endpoint
   - File: `app/api/posts/[id]/route.ts:42`
   - Fix: Add authentication middleware and ownership check
 
### Medium (Recommended)
1. **[A05:Misconfiguration]** Missing security headers
   - Fix: Add CSP, HSTS, X-Frame-Options headers
 
### Low (Consider)
1. **[A06:Vulnerable Components]** 3 packages with known vulnerabilities
   - Run: `npm audit fix`