On 15.02.2024 20:07, Dominique Devienne
wrote:
And now with V16.1 ===========================
ddevienne=> create role zowner nologin createrole; -- owner of app's schemas and manager of related roles
CREATE ROLE
ddevienne=> set role zowner;
ERROR: permission denied to set role "zowner"
ddevienne=> select roleid::regrole::text, member::regrole::text, grantor::regrole::text, admin_option, set_option, inherit_option from pg_auth_members where roleid::regrole::text like 'z%' or member::regrole::text like 'z%';
roleid | member | grantor | admin_option | set_option | inherit_option
--------+-----------+----------+--------------+------------+----------------
zowner | ddevienne | postgres | t | f | f
(1 row)
You can use new psql command \drg for this query.
(2 rows)
ddevienne=> set role zowner;
SET
ddevienne=> create role zadmin nologin noinherit in role zowner; -- means to become zowner explicitly
ERROR: permission denied to grant role "zowner"
DETAIL: Only roles with the ADMIN option on role "zowner" may grant this role.
ddevienne=>
So first surprise in V16. Despite having admin_option, from being the creator of the zowner role, I can't SET ROLE to it. I have to explicitly add the SET privilege.
Yes, but you can automate it with setting new parameter createrole_self_grant.
postgres@demo=# create role ddevienne login createrole;
CREATE ROLE
postgres@demo=# alter role ddevienne set createrole_self_grant = 'INHERIT, SET';
ALTER ROLE
postgres@demo=# \c - ddevienne
You are now connected to database "demo" as user "ddevienne".
ddevienne@demo=> create role zowner nologin createrole;
CREATE ROLE
ddevienne@demo=> \drg ddevienne
List of role grants
Role name | Member of | Options | Grantor
-----------+-----------+--------------+-----------
ddevienne | zowner | INHERIT, SET | ddevienne
ddevienne | zowner | ADMIN | postgres
(2 rows)
ddevienne@demo=> set role zowner;
SET
And then, when ddevienne SET ROLE's to zowner, and tries to create zadmin *and* add it at the same time as a member of zowner (the current_role), it fails.
So it looks like, despite ddevienne having admin_option on zowner, because it is on a "different line" than the set_option, it still cannot add members in zowner???
Behavior changed for security reasons in v15. From Release Notes: > Remove the default ADMIN OPTION privilege a login role has on its own role membership (Robert Haas) > Previously, a login role could add/remove members of its own role, even without ADMIN OPTION privilege. Zowner can create zadmin, but no way to grant membership in itself. What you can do is create a role zadmin by ddevienne: ddevienne@demo=> reset role; RESET ddevienne@demo=> create role zadmin nologin noinherit; CREATE ROLE ddevienne@demo=> grant zowner to zadmin with inherit true, set true; GRANT ROLE ddevienne@demo=> \drg zadmin List of role grants Role name | Member of | Options | Grantor -----------+-----------+--------------+----------- zadmin | zowner | INHERIT, SET | ddevienne (1 row)
-- Pavel Luzanov Postgres Professional: https://postgrespro.com
