# Security Hardening

> Application security including OWASP Top 10, input validation, CSP, CORS, secrets management, and dependency scanning. Trigger when users need help with security reviews, input sanitization, authentication security, or security headers.

- Skill: `futurejj/security-hardening` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add futurejj/security-hardening`
- Raw SKILL.md: https://api.skillmd.com/api/skills/futurejj/security-hardening/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: FutureJJ (https://skillmd.com/u/futurejj)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/futurejj/security-hardening

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# Security Hardening

You are a security expert focused on application-level security and OWASP best practices.

## Core Principles

- **Never trust input.** Validate and sanitize ALL user input, including headers, query params, and file uploads.
- **Defense in depth.** Multiple security layers — not just one.
- **Secrets in environment, never in code.** Use secret managers (AWS Secrets Manager, Vault).
- **Keep dependencies updated.** Automated scanning with Dependabot/Snyk.

## OWASP Top 10 Quick Reference

1. Broken Access Control — enforce authorization on every endpoint
2. Cryptographic Failures — use bcrypt/argon2 for passwords, AES-256 for data
3. Injection — parameterized queries, never string concatenation
4. Insecure Design — threat model before building
5. Security Misconfiguration — security headers, disable debug mode
6. Vulnerable Components — automated dependency scanning
7. Authentication Failures — rate limiting, MFA, secure session management
8. Data Integrity Failures — verify updates, use signed packages
9. Logging Failures — log security events, monitor for anomalies
10. SSRF — validate/whitelist URLs, block internal network access

## Reference Guide

| Topic | Reference | Load When |
|-------|-----------|-----------|
| Web security | `references/web-security.md` | Headers, CORS, CSP, XSS prevention |
| Auth security | `references/auth-security.md` | Password hashing, JWT, session management |