Security Audit Skill

Purpose

Guide security validation with RLS enforcement, OWASP compliance, and vulnerability detection following security-first architecture.

When This Skill Applies

Invoke this skill when:

• Validating RLS policies
• Auditing API routes for auth
• Vulnerability scanning
• Pre-deployment security review
• Checking for exposed credentials
• Reviewing database access patterns

Stop-the-Line Conditions

FORBIDDEN Patterns

// FORBIDDEN: Direct Prisma calls (bypass RLS)
const users = await prisma.user.findMany();
// Must use: withUserContext, withAdminContext, or withSystemContext

// FORBIDDEN: Missing authentication on protected routes
export async function GET(req: Request) {
  // No auth check before accessing user data
  return getUserData();
}

// FORBIDDEN: Exposed credentials
const API_KEY = "sk_live_abc123"; // Hardcoded secret

// FORBIDDEN: SQL injection vulnerability
const query = `SELECT * FROM users WHERE id = ${userId}`; // Interpolated

CORRECT Patterns

// CORRECT: RLS context wrapper
const users = await withUserContext(prisma, userId, async (client) => {
  return client.user.findMany();
});

// CORRECT: Auth check before data access
export async function GET(req: Request) {
  const { userId } = await auth();
  if (!userId) {
    return new Response("Unauthorized", { status: 401 });
  }
  return getUserData(userId);
}

// CORRECT: Environment variables for secrets
const API_KEY = process.env.STRIPE_SECRET_KEY;

// CORRECT: Parameterized queries
const user = await prisma.$queryRaw`SELECT * FROM users WHERE id = ${userId}`;

Security Audit Checklist

1. RLS Validation

• All database operations use context wrappers
• No direct Prisma calls in route handlers
• User isolation verified (user A cannot see user B's data)
• Admin operations properly scoped

# Find potential RLS bypasses
grep -r "prisma\." --include="*.ts" app/ lib/ | grep -v "withUserContext\|withAdminContext\|withSystemContext"

2. Authentication Checks

• All protected routes verify authentication
• Clerk auth() called before data access
• Proper 401/403 responses for unauthorized

# Find routes missing auth checks
grep -r "export async function" --include="route.ts" app/ | head -20
# Manually verify each has auth check

3. Credential Scanning

• No hardcoded secrets in code
• No API keys in client-side code
• Environment variables used correctly

# Scan for potential secrets
grep -rE "(sk_live|pk_live|password|secret|key)" --include="*.ts" --include="*.tsx" | grep -v "process.env\|.env"

4. Dependency Vulnerabilities

# Run security audit
npm audit
yarn audit

# Check for high/critical vulnerabilities
npm audit --audit-level=high

5. Input Validation

• User input validated with Zod schemas
• No raw query interpolation
• File upload restrictions in place

OWASP Top 10 Checklist

Security Validation Commands

# Complete security check
npm audit && yarn lint && echo "Security checks passed"

# RLS bypass detection
grep -r "prisma\." --include="*.ts" app/ lib/ | wc -l
# Compare with context wrapper count

# Secret detection
git secrets --scan  # If git-secrets installed
grep -rE "sk_|pk_|password=" . --include="*.ts"

Pre-Deployment Security Review

Before ANY production deployment:

• npm audit shows no high/critical issues
• RLS policies validated
• No new direct Prisma calls
• Environment variables documented
• Backup taken before migration
• Rollback plan documented

Security Audit Report Template

## Security Audit Report - {TICKET_PREFIX}-XXX

### Summary

- **Date**: [date]
- **Auditor**: Security Engineer
- **Scope**: [what was audited]

### Findings

| Severity | Issue | Location | Status |
| -------- | ----- | -------- | ------ |
| HIGH     | ...   | ...      | FIXED  |
| MEDIUM   | ...   | ...      | OPEN   |

### RLS Validation

- [x] All tables have RLS enabled
- [x] User isolation verified
- [x] Admin policies scoped correctly

### Recommendations

1. [recommendation]
2. [recommendation]

### Approval

- [ ] Security Engineer approves
- [ ] Ready for deployment

Authoritative References

• Security Architecture: docs/guides/SECURITY_FIRST_ARCHITECTURE.md
• RLS Implementation: docs/database/RLS_IMPLEMENTATION_GUIDE.md
• RLS Policies: docs/database/RLS_POLICY_CATALOG.md
• OWASP Top 10: https://owasp.org/Top10/