[comboy]

Can anybody explain me why there seem to be much focus on scalability in this context? I mean we have 8 billion people. If the whole planet registers, home PC can handle it, plus it partitions beautifully if necessary in case of authentication. So what am I missing?

[smarx007]

Forget about 8B people in this context. If you have 1000 microservices in the company and each has 100 rps, you are looking at ca. 100k rps to a Zanzibar-style system to authorize every request (not to authenticate a user).

[dietr1ch]

Why does it need to be checked on a per-request level?

I'd expect you to be able to give short-lived capability tokens to clients that each machine can verify down the stack without making new rpcs. This would avoid the fan-out of all the internal services.

Is it just to prevent abuse?

[akajla]

You can encode capabilities/permissions as scopes in distributed tokens (e.g. OAuth) but this can start to break down if you have very granular, fine-grained permissions (e.g. user:1 has 'editor' access to 1000s of documents/objects). This is similar to the problem that Carta ran into while building out their permissions[1].

In addition, yes - validating permissions on each request makes it so that you can revoke privilege(s) with immediate effect without needing a token to be invalidated.

[1] https://medium.com/building-carta/authz-cartas-highly-scalab...

[smarx007]

I think it's best to refer to the Zanzibar paper: https://www.usenix.org/system/files/atc19-pang.pdf

[zcw100]

... or the annotated one from the Authzed folks https://authzed.com/zanzibar

[smarx007]

Wow, I am also impressed by the tech behind! https://github.com/authzed/zanzibar-annotated

[dietr1ch]

That's neat! All papers should allow this discussion on them.

BTW, didn't Google released something like it too early?

[AlphaSite]

Does the token identify every resource you have access to? I think is for multi tenant applications with fine grained access control.

[paulddraper]

"Oh, you just [insert complex solution here]"

You need one capability token per principal and resource and perhaps access right.

[mort96]

This isn't meant to invalidate what you're saying, but this whole thread reads like a parody to me. 1000 services all making requests to Zanzibar, and this oreo keto thing.

Makes me think of this: https://m.youtube.com/watch?v=y8OnoxKotPQ

[sporkland]

You could apply to S3, RDS, BigTable, Spanner, Firestore, etc. I feel like engineer orthodoxy (monoliths vs microservices, every monolith I've seen accesses a remotely DB and every microservice tends to access a DB which are themselves monoliths), no "god" services tend to break down for a lot of these important high scale stateful facilities.

[smarx007]

Pure gold.

[comboy]

Thanks.