10. Review Secure Implementations (overview)

Chapter 10 - Review Secure Implementations

Part III focused on finding vulnerable code patterns. This part shifts to correct implementation review: whether OAuth flows, token handling, and TLS are built the way standards and threat models require.

Use these chapters when the change touches login, API authorization, service-to-service trust, or certificate configuration—not only when you are hunting injection or XSS.

How to Use These Chapters

Each topic chapter follows the same shape as Part III mini-chapters:

• Python carries the primary walkthrough sample.
• Java and C# appear first in other-language examples, then JavaScript, HTML, Go, SQL, Shell, or C when they apply.
• Fix sections show real library and configuration patterns with official references.

Related vulnerability-focused chapters: 4.16 JWT Security, 4.13 CSRF, 4.12 Cryptographic Implementation, 4.41 Insecure Coding Practice.

Identity and Federation

• 10.1 Review OAuth 2.0 Implementation
• 10.2 Review OpenID Connect (OIDC) Implementation
• 10.3 Review JWT Implementation
• 10.4 Review SAML Federation

Transport and API Trust

• 10.5 Review TLS and SSL Protocol Configuration
• 10.6 Review mTLS and Service Identity
• 10.7 Review API Keys and Request Signing

Suggested Topics for Future Chapters

• Passkeys / WebAuthn — ceremony verification, challenge binding, origin checks
• SCIM provisioning — token scope, rate limits, destructive operation guards
• SPIFFE / SPIRE workload identity — SVID validation in mesh environments