Hi everyone,
First time trying to configure a PG cluster by the book, I want to create a
role with read permissions on all current and future tables in the current
db. It looks smth like this
CREATE ROLE test_role;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO test_role;
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO test_role;
I've been trying out different scenarios for the future, and currently having
a problem when trying to remove "test_role" after adding an extension.
CREATE EXTENSION pg_stat_statements;
DROP ROLE test_role;
The error is as follows:
role "test_role" cannot be dropped because some objects depend on it
DETAIL: privileges for default privileges on new relations belonging
to role postgres in schema public
privileges for view pg_stat_statements_info
initial privileges for view pg_stat_statements_info
privileges for view pg_stat_statements
initial privileges for view pg_stat_statements
Time: 0.001s
I revoke all permissions I know how, but it still won't let me drop "test_role":
ALTER DEFAULT PRIVILEGES IN SCHEMA public REVOKE SELECT ON TABLES FROM
test_role;
REVOKE SELECT ON TABLE public.pg_stat_statements_info FROM test_role;
REVOKE SELECT ON TABLE public.pg_stat_statements FROM test_role;
Expectedly, the error still mentions initial privileges:
role "test_role" cannot be dropped because some objects depend on it
DETAIL: initial privileges for view pg_stat_statements_info
initial privileges for view pg_stat_statements
I haven't been able to find much information on initial privileges and how to
manage them. I know that "REASSIGN OWNED BY" doesn't touch them, but "DROP
OWNED BY" does, but I'm a bit worried that DROP can remove other non-ACL
stuff that was actually created by the role.
I have come up with a solution that lets me clean up the initial privileges,
by repacking pg_init_privs.initprivs and and manually removing stuff from
pg_shdepends, but it feels super hacky:
UPDATE pg_init_privs
-- repacks ['postgres=arwdDxtm/postgres', 'test_role=r/postgres', '=r/postgres']
-- into ['postgres=arwdDxtm/postgres', '=r/postgres']
SET initprivs = (
SELECT array_agg(aclitem) FROM (
SELECT makeaclitem(
ip.grantee,
ip.grantor,
string_agg(ip.privilege_type, ','),
ip.is_grantable
) as aclitem
FROM aclexplode(initprivs) AS ip
WHERE ip.grantee != (SELECT oid FROM pg_roles WHERE rolname = 'test_role')
GROUP BY ip.grantor, ip.grantee, ip.is_grantable
) AS aclitems
)
WHERE privtype = 'e'
AND EXISTS (
SELECT 1
FROM aclexplode(initprivs) AS ip
WHERE ip.grantee = (SELECT oid FROM pg_roles WHERE rolname = 'test_role')
);
DELETE FROM pg_shdepend
WHERE deptype = 'i'
AND refclassid = 'pg_authid'::regclass
AND refobjid = (SELECT oid FROM pg_roles WHERE rolname = 'test_role')
So my questions are:
- Am I doing something with the initial role configuration?
- Is there a SQL command to drop the initial privileges safely?
- If not, should there be one?
Thanks!
