I am currently working within Postgres, and am in the process of creating some users. Whilst creating these user and testing them I've noticed that they're able to view more Schemas than they have access to. In addition to this they can view restricted Schemas tables, views, and functions. This isn't ideal.
When creating users and their permissions is there a way to have a user setup in such a way that they're only able to view certain Schemas and not all Schemas at large within our database?
I should also mention that these users would be viewing our postgres database utilizing either PgAdmin, or Tableau.
Yes. Use the command GRANT USAGE ON SCHEMA [schemaname] TO [username] or REVOKE USAGE ON SCHEMA [schemaname] FROM [username] to control access to the Schema itself.
You might need to do REVOKE USAGE ON SCHEMA [schemaname] FROM public to remove the default access permissions as well.
I suggest reviewing https://www.postgresql.org/docs/current/static/sql-grant.html for the full set of GRANT commands available as you may need to grant/revoke read/write access on some tables as well.