security
Security audits and secure coding. Use for vulnerability detection or auth implementation.
What this skill does
# Security Audit
Identify vulnerabilities and implement secure coding practices.
## When to Use
- Security review of code or architecture
- Implementing authentication/authorization
- Before deploying to production
- User asks about security best practices
- Handling sensitive data
## OWASP Top 10 Checklist
1. **Injection** - Parameterized queries, input sanitization
2. **Broken Auth** - Strong sessions, MFA, secure password storage
3. **Sensitive Data** - Encryption at rest and transit, minimal exposure
4. **XXE** - Disable external entities, use JSON over XML
5. **Broken Access Control** - RBAC, deny by default
6. **Misconfiguration** - Secure defaults, remove debug info
7. **XSS** - Output encoding, CSP headers
8. **Insecure Deserialization** - Validate input, avoid native serialization
9. **Vulnerable Components** - Dependency scanning, updates
10. **Logging** - Audit logs, no sensitive data in logs
## Security Headers
```
Content-Security-Policy: default-src 'self'
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
Strict-Transport-Security: max-age=31536000; includeSubDomains
```
## Auth Implementation
```javascript
// Password hashing
const hash = await bcrypt.hash(password, 12);
// JWT with short expiry
const token = jwt.sign({ userId }, secret, { expiresIn: "15m" });
// Refresh token rotation
const refreshToken = crypto.randomBytes(32).toString("hex");
```
## Audit Output Format
```markdown
## Security Audit Report
**Severity Levels:** Critical | High | Medium | Low
### Critical
- [Issue]: [Description] → [Fix]
### High
- [Issue]: [Description] → [Fix]
### Recommendations
- [Improvement suggestion]
```
## Examples
**Input:** "Review auth implementation"
**Action:** Check password storage, session management, token handling, report findings
**Input:** "Make this API secure"
**Action:** Add input validation, auth checks, rate limiting, security headers
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