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5. Review Secure Implementations (overview)

Chapter 5 - Review Secure Implementations

Overview

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 a change touches login, API authorization, service-to-service trust, or certificate handling—not only when hunting injection or XSS. The points below are the ideas Part IV uses again and again.

  1. Protocol and credential bugs share a trust decision: who may redirect, assert, mint, or speak as whom.
  2. Related implementations share one review model; variants adjust ceremony, claims, or handshake details.
  3. Code-level parse flaws (for example algorithm confusion) stay in Chapter 4.5; issuance, JWKS, and rotation live here.
  4. Evidence names the protocol step or credential, the missing control, the impact, and a proving test.
  5. Dense library catalogs stay in the secure-implementations appendix.

After reading this overview and the three family chapters, we should be able to review identity and transport changes against standards-shaped checks and know when to open the appendix.

Three Family Chapters (Consolidated)

Former seven topic chapters are grouped into three families. Each family shares one review model, lists variants with where-to-look tables, walks one primary example, and points to the appendix for library catalogs and multi-language samples.

# Family Former topics
5.1 Identity & federation OAuth 2.0, OpenID Connect, SAML
5.2 Tokens & API trust JWT issuance/validation, API keys & request signing
5.3 Transport & service identity TLS/SSL protocol, mTLS

Related vulnerability-focused material: 4.5 Review Authentication, Session, and Access § JWT security (code-level), 4.5 § CSRF, 4.8 Review Cryptography in Application Code.

How to Use a Family Chapter

The sequence below matches Part III family chapters.

  1. Shared model — the review question for the whole family.
  2. Variants — short definitions and where-to-look tables (former topics).
  3. Worked example — one Python sample and step-by-step walkthrough.
  4. Risk, fix principles, verify — family-level evidence habits.
  5. Appendix pointer — libraries, sinks, and multi-language fixes.

Open the Appendix — Secure Implementations Reference when density is needed.

Suggested Topics for Future Chapters

These topics are candidates when Part IV expands later.

  • 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