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security-best-practices

Skill1 starsChanged 11 months agoMITView on GitHub

Security best practices and vulnerability prevention. Auto-activates when writing code that handles auth, user input, or sensitive data.

We split this skill into the rules it gives an agent

2 rules. 0 are common, 2 are distinctive, and 0 are very specific to this project.

  • 0

    Common

    Most of the 33 edited versions we read keep these.

  • 2

    Distinctive

    This author's own choices. Worth a look.

  • 0

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  • could be automatic: a setting could enforce it
  1. Distinctive:

    Never commit secrets to git

    line 52
  2. Distinctive:

    Use secrets manager in production

    line 55

“Common” is measured: kept by at least 6 in 10 of the 33 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Security Best Practices

OWASP Top 10 Prevention

1. Injection Prevention

// SQL - Use parameterized queries
const user = await db.query('SELECT * FROM users WHERE id = $1', [userId]);

// NoSQL - Sanitize input
const user = await User.findOne({ email: sanitize(email) });

2. Authentication

// Password hashing
import bcrypt from 'bcrypt';
const hash = await bcrypt.hash(password, 12);
const valid = await bcrypt.compare(input, hash);

// JWT with short expiry
const token = jwt.sign({ userId }, secret, { expiresIn: '15m' });

3. XSS Prevention

// React auto-escapes, but avoid dangerouslySetInnerHTML
// If needed, use DOMPurify
import DOMPurify from 'dompurify';
const clean = DOMPurify.sanitize(userHtml);

4. CSRF Protection

// Use CSRF tokens
app.use(csrf());
res.cookie('XSRF-TOKEN', req.csrfToken());

5. Security Headers

import helmet from 'helmet';
app.use(helmet());

Secrets Management

  • Never commit secrets to git
  • Use environment variables
  • Rotate keys regularly
  • Use secrets manager in production

Checklist

  • Input validation on all user data
  • Output encoding for XSS prevention
  • Parameterized queries for SQL
  • HTTPS enforced
  • Security headers set
  • Rate limiting implemented
  • Logging without sensitive data

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