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auth-security

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dist/agent-skills/.agents/skills/auth-security/SKILL.md

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<!-- Native skill bundle for agent-skills (cross-tool convention). Generated by `secure-vibe dev regenerate`. -->
<!-- Do not edit by hand; the source of truth is skills/auth-security/SKILL.md. -->

# Authentication & Authorization Security

[Credential-related source omitted]

## ALWAYS

- Authorize at the **object level** — confirm the authenticated subject actually has access to the requested resource ID, not just that they are logged in. Being signed in is not permission to read record 4,182 (OWASP API1 — BOLA / IDOR).
- Bind object-level authorization to the **authenticated principal**, never to an actor id echoed in the request: checking that a request-supplied `senderId`/`ownerId`/`actedBy` is a valid member validates the *claimed* actor, not the caller (looks like authorization, isn't).
- On `/{scopeId}/.../{subjectId}` routes, authorize the **relationship** — confirm the subject belongs to that scope. A caller-vs-scope check alone does not authorize the subject (multi-key BOLA).
- Authorize **each subject on streaming responses** (SSE/chunked/WebSocket): the `200` is committed before the handler runs, so an empty/filtered stream — not a `4xx` — is the deny signal; an unauthorized subject gets zero events.
- Enforce a **function-level role / privilege check** on any write that publishes into a shared or global namespace (a global gallery, shared catalog, public template list). Authentication is not authorization (OWASP API5 — Broken Function Level Authorization); a low-privilege user posting into a globally-visible store is a delivery vector for stored-XSS and malicious-link chains.
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