Re: Question about permissions in the Schema

[Laurenz Albe <laurenz.albe@xxxxxxxxxxx>]

On Tue, 2025-06-03 at 11:44 +0000, Sabyasachi Mukherjee wrote:
> I have a database with 5 different schemas. Each schema has the same set of tables, but the data is different.
> I have created one user to access the data in the tables from one schema only.
> The user can access the data from the target schema. For all other schemas it get a permission error except one.
> I have specifically run the Revoke command for the schema but still the user can access the
> data from that schema. I have run the command in PGAdmin. Also DBBeaver does not any permission for the objects
> in the leaking schema for the user.
> What could be wrong and how should I fix it.
> I am running PG 17 on Linux. 

To diagnose the problem, look at the permissions on that schema:

  SELECT a.grantor::regrole AS grantor,
         a.grantee::regrole AS grantee,
         a.privilege_type
  FROM pg_namespace AS s
     CROSS JOIN LATERAL aclexplode(s.nspacl) AS a
  WHERE s.nspname = 'schema_name';

Compare that with the user that is granted access and all its groups:

  WITH RECURSIVE myroles AS (
     SELECT current_user::regrole AS r
     UNION ALL
     SELECT m.roleid::regrole
     FROM pg_auth_members AS m
        JOIN myroles ON m.member = myroles.r
  )
  SELECT * FROM myroles;

Yours,
Laurenz Albe