# JAAS

> JAAS is an enterprise layer on top of Juju that provides centralized controller management, OIDC authentication, and ReBAC authorization.


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## Pages in this subsection

- [ReBAC admin backend](https://documentation.ubuntu.com/jaas/latest/explanation/jaas-rebac-admin-backend.md): Learn about the ReBAC Admin REST API for querying and manipulating relationships in JAAS authorization model with OpenAPI specification.

## Optional

- [Top-level llms.txt](https://documentation.ubuntu.com/jaas/latest/llms.txt): Complete documentation index.