pgadmin shows the default privilege for a schema was granted to an individual user and I need to revoke privilege granted from individual users.
ALTER DEFAULT PRIVILEGES IN SCHEMA a_schema
GRANT ALL ON TABLES TO a_user;
I try the following command but can't revoke the privilege.
ALTER DEFAULT PRIVILEGES IN SCHEMA a_schema
REVOKE ALL ON TABLES FROM a_user;
Can someone show me how to revoke the default privilege schema from user?
Related
I would like to create "read-only privileges" in a PostgreSQL database (including the restriction of creating or dropping tables).
My strategy is to create a group with these privileges and then add roles that have had all their privileges revoked. In that way, the only inherit privileges when part of the read-only group.
I used the following commands to create privileges but it seems roles can add, delete tables when they join the group:
role_test_db=# REVOKE ALL ON DATABASE role_test_db FROM select_access_group;
REVOKE
role_test_db=# GRANT CONNECT ON DATABASE role_test_db TO select_access_group;
GRANT
role_test_db=# GRANT SELECT ON ALL TABLES IN SCHEMA public TO select_access_group;
GRANT
I was reading the documentation and it seems like creating tables would be under CREATE privilege but I have not granted this. Can some explain why users part of this group can still make tables?
There are several mistakes:
Revoking privileges on the database does not restrict user's rights to create objects. For that, you have to revoke privileges on the schemas.
You can only REVOKE privileges that were GRANTed (by default or explicitly). I doubt that select_access_group has ever been granted any privileges on the database.
You likely forgot to revoke the dangerous default CREATE privilege on schema public. Connect as superuser and run
REVOKE CREATE ON SCHEMA public FROM PUBLIC;
A user can only revoke privileges that were granted directly by that user
https://www.postgresql.org/docs/13/sql-revoke.html
See privileges
\du
select * from pg_roles;
Change (base) prilileges under admin role (postgres)
I am struggling with dropping a ready only user I created on one of the database in the cluster. I created a read only user using following script:
CREATE USER is_user_readonly WITH ENCRYPTED PASSWORD 'test1';
GRANT CONNECT ON DATABASE db1 to is_user_readonly;
GRANT USAGE ON SCHEMA public to is_user_readonly;
GRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO is_user_readonly;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO is_user_readonly;
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO is_user_readonly;
I logged in database db1 and created this user is_user_readonly. I logged in as admin. This user is created on all databases in the cluster.
Now, for dropping this user, I logged in db1 as admin and ran below scripts:
REVOKE ALL PRIVILEGES ON DATABASE db1 FROM is_user_readonly;
REVOKE ALL PRIVILEGES ON SCHEMA public FROM is_user_readonly;
REVOKE ALL PRIVILEGES ON ALL TABLES IN SCHEMA public FROM is_user_readonly;
REVOKE ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public FROM is_user_readonly;
REVOKE USAGE ON SCHEMA public FROM is_user_readonly;
REVOKE CONNECT ON DATABASE db1 FROM is_user_readonly;
At this point I am really pulling out my hair that there is still some dependency.
SQL Error [2BP01]: ERROR: role "is_user_readonly" cannot be dropped because some objects depend on it
Detail: privileges for default privileges on new relations belonging to role isadmin in schema public
ERROR: role "is_user_readonly" cannot be dropped because some objects depend on it
Detail: privileges for default privileges on new relations belonging to role isadmin in schema public
ERROR: role "is_user_readonly" cannot be dropped because some objects depend on it
Detail: privileges for default privileges on new relations belonging to role isadmin in schema public.
Do I need to run the revoke script on all database in this cluster?
Any help is highly appreciated.
Revoke the default privileges:
ALTER DEFAULT PRIVILEGES FOR ROLE whatever IN SCHEMA public
REVOKE SELECT ON TABLES FROM is_user_readonly;
The role whatever here is the user you were logged in as when you ran the ALTER DEFAULT PRIVILEGES statement.
I created new role named "support" in my PostgreSQL. Now I need grant "READ ONLY" permissions for this role an ALL exists databases/tables.
Also I need automatically granted same permissions on each DB that will created in future.
I unsuccessfully tried next queries for grant permissions in new databases (Can not select from new database tables ):
ALTER DEFAULT PRIVILEGES FOR ROLE support GRANT SELECT ON TABLES TO PUBLIC;
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES to support;
ALTER DEFAULT PRIVILEGES allows you to set the privileges that will be
applied to objects created in the future. (It does not affect
privileges assigned to already-existing objects.)
We have an existing postgres database in production with a superuser adm that is being used to do everything. Our web application connects to the database using the same user and also the administrators(for patching/updating etc.) use the same credentials.
We have to fix this to have roles so that we can have read-write, readonly and admin roles.
We don't want our web application and admin to connect to the database as superuser.
With that being said, I have created the following sql script to make the appropriate roles.
I am not a database expert(not yet) so wanted to know the issues or better ways to solve this.
ALTER ROLE adm NOLOGIN;
CREATE role user_role NOINHERIT;
CREATE role readonlyuser_role NOINHERIT;
CREATE role admin_role CREATEDB CREATEROLE NOINHERIT;
CREATE ROLE u_service LOGIN PASSWORD '<some password>' INHERIT;
CREATE ROLE u_admin LOGIN PASSWORD '<some password>' INHERIT;
CREATE ROLE u_reader LOGIN PASSWORD '<some password>' INHERIT;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO readonlyuser_role;
GRANT ALL PRIVILEGES ON SCHEMA public TO admin_role;
GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA public TO user_role, admin_role;
GRANT ALL PRIVILEGES ON ALL FUNCTIONS IN SCHEMA public TO user_role, admin_role;
GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public TO user_role, admin_role;
GRANT ALL PRIVILEGES ON ALL PROCEDURES IN SCHEMA public TO user_role, admin_role;
GRANT ALL PRIVILEGES ON ALL ROUTINES IN SCHEMA public TO user_role, admin_role;
GRANT ALL PRIVILEGES ON SCHEMA audit TO admin_role;
GRANT ALL PRIVILEGES ON ALL TABLES IN SCHEMA audit TO admin_role;
GRANT ALL PRIVILEGES ON ALL FUNCTIONS IN SCHEMA audit TO admin_role;
GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA audit TO admin_role;
GRANT ALL PRIVILEGES ON ALL PROCEDURES IN SCHEMA audit TO admin_role;
GRANT ALL PRIVILEGES ON ALL ROUTINES IN SCHEMA audit TO admin_role;
GRANT admin_role TO u_admin;
GRANT user_role TO u_service;
GRANT readonlyuser_role TO u_reader;
A few things to consider.
Spell out what user_role and readonlyuser_role can do
Start by revoking all privileges from both these roles, then add them back only as needed. This makes it both clearer in your intentions about what the roles should do, and safer in practice because higher privileges than intended won't accidentally sneak in.
REVOKE ALL ON SCHEMA public FROM public; --only authorized roles can do anything here.
REVOKE ALL ON SCHEMA public FROM user_role;
REVOKE ALL ON SCHEMA public FROM readonlyuser_role;
GRANT ...
The Database Owner is a local Superuser
We usually make the db owner an additional role; one who only logs in to create or alter the schema, then gracefully exits. If your admin_role does more than this, consider adding an owner_role.
Does a public role need to connect?
Consider adding
REVOKE CONNECT ON DATABASE yourdb FROM public;
This blocks the loophole where any role created on the same DB server could log into this database.
Do all this in a transaction block
Stopping privilege assignment half-way through the job can lead to all sorts of trouble, much akin to locking your keys in your car. Make the privilege assignments a single transaction where possible, so a missed semicolon doesn't lock you out.
I know it should be easy question but still facing an issue with permissions.
I need to have 3 users in postgres:
Fully Admin like default "postgres" user
Should have access to insert, select and update with delete but no admin access
Should have access to all tables only with read only permissions
I did this in this way:
CREATE role program_schema_role_ro ;
CREATE role program_schema_role_normal ;
CREATE role program_schema_role_admin ;
CREATE USER user_ro WITH PASSWORD 'user_ro';
CREATE USER user_app WITH PASSWORD 'user_app';
CREATE USER user_admin WITH PASSWORD 'user_admin';
GRANT program_schema_role_ro to user_ro;
GRANT program_schema_role_normal TO user_app;
GRANT program_schema_role_admin TO user_admin;
GRANT program_schema_role_admin TO postgres;
ALTER DEFAULT PRIVILEGES FOR ROLE program_schema_role_admin IN SCHEMA public GRANT ALL ON TABLES TO program_schema_role_admin;
GRANT ALL ON ALL TABLES IN SCHEMA public TO program_schema_role_admin;
GRANT posgtres TO program_schema_role_admin;
ALTER DEFAULT PRIVILEGES FOR ROLE program_schema_role_admin GRANT ALL ON SEQUENCES TO program_schema_role_admin;
GRANT ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public TO program_schema_role_admin;
REVOKE program_schema_role_admin FROM postgres;
GRANT program_schema_role_normal TO postgres;
ALTER DEFAULT PRIVILEGES FOR ROLE program_schema_role_normal IN SCHEMA public GRANT SELECT, INSERT, UPDATE, DELETE, TRUNCATE ON TABLES TO program_schema_role_normal;
GRANT SELECT, INSERT, UPDATE, DELETE, TRUNCATE ON ALL TABLES IN SCHEMA public TO program_schema_role_normal;
ALTER DEFAULT PRIVILEGES FOR ROLE program_schema_role_normal GRANT USAGE, SELECT ON SEQUENCES TO program_schema_role_normal;
GRANT USAGE, SELECT ON ALL SEQUENCES IN SCHEMA public TO program_schema_role_normal;
REVOKE program_schema_role_normal FROM postgres;
GRANT program_schema_role_ro TO postgres;
ALTER DEFAULT PRIVILEGES FOR ROLE program_schema_role_ro IN SCHEMA public GRANT SELECT ON TABLES TO program_schema_role_ro;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO program_schema_role_ro;
ALTER DEFAULT PRIVILEGES FOR ROLE program_schema_role_ro GRANT SELECT ON SEQUENCES TO program_schema_role_ro;
GRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO program_schema_role_ro;
REVOKE program_schema_role_ro FROM postgres;
But still after all of this I facing a lot of issues.
Like after new table which created by admin, no read access to other
Or app user or ro user have permissions to alter.
Where is my mistake?
The ALTER DEFAULT PRIVILEGES statements you run will only affect objects created by program_schema_role_ro itself, not objects created by members of that role.
You'd have to run
ALTER DEFAULT PRIVILEGES FOR ROLE user_admin ...