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Fedora Security Team

Secure Ruby Development Guide

Guide to secure software development in Ruby

Edition 1

Ján Rusnačko

Red Hat, Inc. Product Security Team

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Copyright © 2014 Ján Rusnačko.
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Abstract
This guide covers security aspects of software development in Ruby.

1. Environment
1.1. Code quality metrics
1.2. Dependency management
1.2.1. Outdated Dependencies
1.2.2. Vendoring dependencies
1.2.3. Gem signing
1.3. Static code analysis with Brakeman
1.3.1. Continuous integration
1.3.2. Reducing number of false warnings
2. Language features
2.1. Tainting and restricted code execution
2.1.1. Object.tainted?
2.1.2. Object.untrusted?
2.1.3. $SAFE
2.2. Dangerous methods
2.3. Symbols
2.4. Serialization in Ruby
2.4.1. Marshal.load
2.4.2. YAML.load
2.4.3. JSON.parse and JSON.load
2.4.4. Exploiting deserialization vulnerabilities
2.5. Regular expressions
2.6. Object.send
2.7. SSL in Ruby
2.7.1. Certificate store
2.7.2. Ruby libraries using OpenSSL
3. Web Application Security
3.1. Common attacks and mitigations
3.1.1. Command injection
3.1.2. Cross site scripting (XSS)
3.1.3. Cross site request forgery (CSRF)
3.1.4. Guidelines and principles
3.2. Client-side security
3.2.1. Same origin policy
3.2.2. Bypassing same origin policy
3.2.3. Content Security Policy (CSP)
3.2.4. HTTP Strict Transport Security
3.2.5. X-XSS-Protection
3.2.6. X-Frame-Options
3.2.7. X-Content-Type-Options
3.2.8. Configuring Rails
3.2.9. Guidelines and recommendations
3.3. Application server configuration and hardening
3.3.1. Logging
A. Revision History
Index