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permissions on tables

From: "Hyatt, Gordon" <Gordon(dot)Hyatt(at)joslin(dot)harvard(dot)edu>
To: <pgsql-admin(at)postgresql(dot)org>
Subject: permissions on tables
Date: 2008-03-17 20:26:27
Message-ID: (view raw or whole thread)
Lists: pgsql-admin
Forgive me if this is not the correct list for this type of question.


I thought I understood PostgreSQL's privileges well enough, but I'm
running into problems, so I must misunderstand something.  


I have a website that I'm adding functionality to, and therefore need to
expand the database.  The database already contains around 30 populated
tables with 1 group role (group_reader) and 1 user role (user_reader).
To all existing tables, I'd assigned PUBLIC and group_reader SELECT


Everything is working fine.


Now, I created one more group role (called group_writer) and another
user role (user_writer) and make sure that user_writer is a member of


I then explicitly grant group_writer SELECT privilege on all tables.  (I
know this is technically not necessary as PUBLIC has already been
assigned SELECT privilege.)


I created (tbl_batch) and deliberately decided to not grant PUBLIC
access to this table.  Instead, I granted group_writer SELECT, INSERT,
UPDATE, and DELETE privileges to this table.  Looking at the ACL list
for this table confirms this.


When I attempt to access this table as user_writer, I'm denied access.
I'm access this through Tomcat and verifying the connected user as


I shouldn't have to grant the PUBLIC  group full access to this table as
well, should I?


From what I understand of the manual, a user's privileges are the SUM of
the privileges of all groups of which that user is a member.  Therefore,
user_writer's privileges should be {SELECT, INSERT, UPDATE, DELETE} from
group_writer plus {} from PUBLIC, which should yield {SELECT, INSERT,



BTW, I'm running 8.2.6 on WinXP x64 SP2.








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