I want to give permissions to a user on all the tables existing in a database. Is there any way to grant a user on multiple tables?
It is not possible to grant permissions to multiple objects in a single statement, you need to grant per object.
Related
I have a sample database containing two schemas and I have two roles in the database.
I need to grant rights in a way that
role can grant all permission within schema #1 (nowhere else)
role can grant all permission within schema #2 (nowhere else)
(essentially "schema-specific admins")
Would someone know a possible approach to this?
I can think of two ways:
the “administrator role” for each schema owns the objects in that schema – then the requirement is automatically fulfilled
all objects are owned by the same role, and that role uses GRANT ... WITH GRANT OPTION on all tables in each schema to the respective administrative role
I'd prefer the first option, because it is simpler.
I am new to Postgres and want to know if there is a way to CREATE a DB USER in such a way that it will have access to ALL the SCHEMA's including those which are not created yet, I mean access to all the current and future schema's.I have multiple Schema's in my Postgres DB which have the same Tables.If the above is possible I want this user to have SELECT,INSERT,UPDATE on only 2 Tables in the existing and future created Schemas.
You can use ALTER DEFAULT PRIVILEGES to give a user permissions on future schemas and tables, but you cannot restrict that to certain table names.
You may be able to do that with an event trigger.
Personally, I would put GRANT statements into the code that creates the tables.
This is probably a silly question and I'm sure it's a problem with my mental model.
Ultimately I want to set privileges on a role such that any other roles in that role have CRUD access to all the current tables and automatically all of the future tables in perpetuity for said database. but ONLY those roles that have been explicitly added to said 'group role'.
It's not clear how to do this.
There is no way to get exactly what you want, but you can get close enough.
Dealing with existing tables is simple enough: just revoke all privileges that have been granted on the tables and grant access to your group role. The command that makes this easy is
GRANT/REVOKE ALL
ON ALL TABLES IN SCHEMA ... TO/FROM ...;
To deal with future tables, you'll have to restrict the circle of users that may create tables to a few, and for each of them run
ALTER DEFAULT PRIVILEGES FOR ROLE creating_user
GRANT ALL ON TABLES TO ...;
If you cannot enumerate the users that can create tables, an event trigger running at the end of each CREATE statement may be an alternative.
I'm new on PostgreSQL. I created a user for to use a specific schema. I have done a table but I can't prevent on schema. I don't want to show all schema to the user. How can I prevent to access the schema?
Grant and Revoke to grant access and privileges on your database, including schema.
I want to create a postgres user that can access only one database on the postgres server at all.
Currently my flow is:
create database database1;
create user user1 with password 'pass';
grant all privileges on database database1 to user1;
but user1 can still see a list of dbs, users, tables etc. Is there a way to prevent that user from seeing that info? The user needs to be able to write to and read from that db.
Thanks a lot.
Each user can see other databases and roles listed, but should not be able to see tables in other databases, ever.
If you revoke CONNECT privilege on all databases except the allotted one, the user will not be able to access the contents of other databases.
Roles and database names are global, and not readily blockable. You can try Frank Heikens suggestion of selective revocations on the system tables, but you take risks to do that. PostgreSQL developers on the usenet mailing lists have discouraged tampering with access to the system catalogs.
Psql, among other tools, assumes they will be available and functions poorly without them.
Why is knowing the names of other databases and roles so bad?
REVOKE the SELECT permissions on the information_schema and some sections in the system catalog.
By default any objects you create are created in the public schema. Also, any users that you create have CREATE and USAGE privileges on the public schema. You should revoke CREATE and USAGE to the public schema for this user, or you should change the default access level. You'll also need to move the database to which this user has access into the user's schema, or a schema accessible to the user. See DDL Schemas in the Postgres manual.