ladon VS openfga

4. OPA evaluates the policies written in Rego against the input and returns a decision (allow or deny) back to your service.

What's good solid alternatives in Kubernets? Saw CASBIN, paid services, but nothing close to OPA/Rego. Please correct me if I'm wrong.

I found it's hard to convince everyone around to use OPA/Rego and wrap into a managed service. The main objection - wrapping another DSL (domain-specific language) is hard.

However it was relatively simple to convince my team to use featured complete Go library Ladon https://github.com/ory/ladon

Ladon is inspired by AWS IAM Policies.

{

It’s 2025 y’all, time to retire that ancient, one-size-fits-all approach. OpenFGA gives you the flexibility to handle complex user relationships with elegance. Whether you’re cooking up the next Slack, managing external contractors, or just tired of editing roles for your friends named Bob, ReBAC can save you from permissions purgatory.

External Authorization System Using Policy engines like SpiceDB, OpenFGA, ORY Keto, OpenPolicy Agent (OPA), let you put your ReBAC rules in an external system and reference them from your queries. The main benefit you get from the centralized relationships model is it makes it possible to manage authorization centrally. This means that development teams can create new applications and add new relationships without needing to update any application code.

How does this compare to auth0's OpenFGA (based on Zanzibar)?

https://openfga.dev

This feels very much like OpenFGA[0]. I've been evaluating authorization tool for one of my side projects and honestly most tools feels like creating relationships in a graph-like database and querying to see if there is/isn't relationship between two entities. Is there more to this (besides the implementation details) or am I missing something from these tools?

[0] https://openfga.dev/

OpenFGA

OpenFGA is CNCF Sandbox authorization service inspired by Google Zanzibar

- https://authzed.com/spicedb/ - https://cerbos.dev/ - https://openfga.dev/ - https://www.permify.co/

Thanks for the answer. I played around with Keycloak for a bit and I saw that roles could be mapped as token claims, however for systems where you need fine grained access control (where roles are not enough) you need some other solution. One option could be to use an external authorization system. One such system could be OpenFGA https://openfga.dev/ that is based on Google Zanzibar https://research.google/pubs/pub48190/ research paper. This answer on SO is also helpful https://stackoverflow.com/a/75047064/10781180