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https://issues.apache.org/jira/browse/CASSANDRA-13985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16279342#comment-16279342
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Blake Eggleston commented on CASSANDRA-13985:
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Coming back to this, I think that the implicit granting by omission seems like
the least bad option. Basically wildcard by default. I expect the most common
use case will be to confine a user to a single data center. So I’m looking at
this this from the perspective of making that easy to achieve.
I don’t think implementing this as a straight up whitelist would work because
it creates a chicken and egg problem of turning on the authz feature and being
able to connect to it and configure it. Also, if you’re only interested in
confining a subset of all your users, it becomes difficult to administer. On
the other hand, a black list would add the overhead of having to go and update
each restricted role any time a dc is added. Obviously it’s not something that
happens often, but I don’t think we need to add another detail that needs to be
worried about (and easily overlooked) if we can avoid it.
> Support restricting reads and writes to specific datacenters on a per user
> basis
> --------------------------------------------------------------------------------
>
> Key: CASSANDRA-13985
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13985
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Blake Eggleston
> Assignee: Blake Eggleston
> Priority: Minor
> Fix For: 4.0
>
>
> There are a few use cases where it makes sense to restrict the operations a
> given user can perform in specific data centers. The obvious use case is the
> production/analytics datacenter configuration. You don’t want the production
> user to be reading/or writing to the analytics datacenter, and you don’t want
> the analytics user to be reading from the production datacenter.
> Although we expect users to get this right on that application level, we
> should also be able to enforce this at the database level. The first approach
> that comes to mind would be to support an optional DC parameter when granting
> select and modify permissions to roles. Something like {{GRANT SELECT ON
> some_keyspace TO that_user IN DC dc1}}, statements that omit the dc would
> implicitly be granting permission to all dcs. However, I’m not married to
> this approach.
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