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Re: Users + Groups = Roles, duplicate name issue

From: "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>
To: ljb <ljb220(at)mindspring(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Users + Groups = Roles, duplicate name issue
Date: 2005-12-21 20:31:23
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
Which version of pg_dump did you use to dump the old database? The
recommended procedure is to use the newer version of pg_dump (ie:
pg_dump from 8.1.1) to dump the old database. It's possible that the
newer version of pg_dump has facilities in place to deal with this.
Those facilities would obviously be missing from older versions.

On Wed, Dec 21, 2005 at 01:42:14AM +0000, ljb wrote:
> I loaded a 7.4.x dump into a new 8.1.1 database and found out what happens
> if you had the same name as both a user and a group. You can get users with
> more rights than they had before.  I guess it is too late, but perhaps a
> mention in the release text would have been a good idea. Advise people to
> rename any group which has the same name as a user.
> For example, if at 7.4.x I have:
>   Group:    Is granted all rights to table:
>     test      test_data
>     acct      money_data
>   Username:   Member of group:   And therefore gets all rights to table:
>     ljb         test               test_data
>     test        acct               money_data
> After loading the dump into 8.1.1, the test user and test group get merged
> into a single role, so the test user gets granted all rights to the test_data
> table. In addition, 'ljb' now effectively is a member of the 'acct' group
> (via the test role), so is granted all rights to the money_data table.
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Jim C. Nasby, Sr. Engineering Consultant      jnasby(at)pervasive(dot)com
Pervasive Software    work: 512-231-6117
vcard:       cell: 512-569-9461

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