Question about bucket / object policy

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Hello ceph-users,
I need to prevent the use of public objects in some Ceph S3 clusters where clients access directly via haproxy as balancer and backend on radosgw. I would like to know if anyone has found a solution to prevent entire Buckets or even single objects from being made accessible without authentication and that they can be exposed with a specific URL.

I tried to set the policies in 'deny' for
"s3:PutBucketPolicy",
"s3:PutObjectAcl"
and the objects uploaded to the bucket after the policy is applied cannot be made public.

However, I would need to have a way to set the Deny on all buckets when they are created by clients because otherwise I have to iterate on all existing buckets and apply the policy, but in this way if the client creates a bucket, uploads some objects and makes them public before the Deny is applied I no longer have control. I should then also execute a policy on all objects but it becomes a very long operation.
If anyone has any ideas on this it would be greatly appreciated.

Thank you very much.

Andrea
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