Individual skill
saml-pro
Deploy SAML SSO securely — assertion hardening, metadata management, and defense against signature and XML attacks.
skills/saml-pro/SKILL.md
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## Overview
SAML 2.0 remains the backbone of enterprise SSO, federating authentication between identity providers (IdPs) and service providers (SPs) via signed XML assertions. Its XML complexity is also its risk: signature-wrapping, XXE, and assertion-manipulation vulnerabilities have a long history. Defensive SAML practice is strict validation and minimal trust.
This skill covers secure SAML deployment: hardening assertions, managing metadata and certificates, and defending against the known vulnerability classes — from the defender's side.
SAML's XML complexity is a historical source of subtle vulnerabilities — which is why the defensive posture is radical simplicity: use a maintained library, validate strictly, trust minimally, and test the negative cases deliberately. Every SAML integration that 'just works' without negative testing is carrying unverified assumptions about what it rejects.
## When to use
- Implementing SAML SSO for enterprise applications (as SP or IdP).
- Reviewing an existing SAML integration flagged in a pentest or audit.
- Rotating SAML signing certificates without breaking SSO.
- Troubleshooting SSO failures securely (without weakening validation to "make it work").