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Security Best Practices

Harden Ruby applications with input validation, safe serialization, and principle-of-least-privilege design.

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Ruby Security Best Practices

Ship features with a secure-by-default mindset. Combine input validation, safe serialization, least-privilege permissions, and continuous monitoring to protect users and data.

Input validation & output encoding

  • Whitelist parameters with strong parameters or dry-validation schemas. Reject unexpected fields.
  • Escape user-generated content by default (`ERB` autoescape, `sanitize` for rich text).
  • Normalise data before storing (downcase emails, strip whitespace) to avoid ambiguous comparisons.

OWASP Top 10 mapping

Risk Mitigation in RubyDev
Injection Parameterised queries, whitelisting, `public_send` with allow-lists
Broken auth Devise, bcrypt, ratelimits, session timeouts
Sensitive data exposure HTTPS everywhere, filtered logs, encrypted credentials
Security misconfiguration Security headers, CSP, locked-down container images

Operational checklist

  1. Enable `config.force_ssl`, HSTS headers, and modern TLS versions in production.
  2. Rotate credentials regularly and keep secrets in the managed vault (Rails encrypted credentials + cloud secret store).
  3. Automate dependency vulnerability scans (Dependabot, bundler-audit) and patch within agreed SLA.
  4. Instrument security-focused alerts (unexpected admin login, mass export) and perform quarterly tabletop drills.

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Watch and learn security best practices

Pro Tip: After reading through the content above, watch this video to reinforce your understanding and see the concepts in action!