How to Check Users Assigned to Roles and Vice Versa

Learn how to query ClickHouse’s system.role_grants to find users assigned to roles and roles assigned to specific users.

Question

How to check users assigned to roles and vice versa?

Answer

Log in as the default user, which has administrator privileges, and check the current user:

Query

SELECT user()

Response

Query id: 9bc02d8b-ab05-4a63-b2dd-3e0093f36d31

┌─currentUser()─┐
│ default       │
└───────────────┘

1 row in set. Elapsed: 0.001 sec.

Create the user foo:

Query

CREATE USER foo IDENTIFIED WITH sha256_password BY 'secretPassword123!';

Response

Query id: 9711f5fc-2b5c-43f0-a760-0c67764919a2

Ok.

0 rows in set. Elapsed: 0.102 sec.

Create the user bar:

Query

CREATE USER bar IDENTIFIED WITH sha256_password BY 'secretPassword123!';

Response

Query id: 11a78bf5-f5e1-4f1d-bfe8-cf2aa0a1b15d

Ok.

0 rows in set. Elapsed: 0.103 sec.

Create the role role_a:

Query

CREATE ROLE role_a;

Response

Query id: 13ccc007-fa5a-4110-9a05-48e284cea45f

Ok.

0 rows in set. Elapsed: 0.104 sec.

Create the role role_b:

Query

CREATE ROLE role_b;

Response

Query id: 43f84376-76fa-4cd2-b8e2-2dcfbe41ec1b

Ok.

0 rows in set. Elapsed: 0.103 sec.

Grant role_a to the users foo and bar:

Query

GRANT role_a TO foo, bar;

Response

Query id: 4fe91624-efb3-4091-b680-b6905ab445b4

Ok.

0 rows in set. Elapsed: 0.107 sec.

Grant role_b to the user bar:

Query

GRANT role_b TO bar;

Response

Query id: 7ea38b28-2719-4dd6-8abd-0241f7b34d5c

Ok.

0 rows in set. Elapsed: 0.102 sec.

Check which users have been assigned role_a:

Query

SELECT * FROM system.role_grants WHERE granted_role_name = 'role_a';

Response

Query id: bf088776-f450-4150-b2e8-197b400573c1

┌─user_name─┬─role_name─┬─granted_role_name─┬─granted_role_is_default─┬─with_admin_option─┐
│ bar       │ ᴺᵁᴸᴸ      │ role_a            │                       1 │                 0 │
│ foo       │ ᴺᵁᴸᴸ      │ role_a            │                       1 │                 0 │
└───────────┴───────────┴───────────────────┴─────────────────────────┴───────────────────┘

2 rows in set. Elapsed: 0.001 sec.

Check which roles have been assigned to the users foo and bar:

Query

SELECT * FROM system.role_grants WHERE user_name IN ('foo', 'bar');

Response

Query id: b81dbe1c-42f0-43bd-b237-1a6b1d81ae3d

┌─user_name─┬─role_name─┬─granted_role_name─┬─granted_role_is_default─┬─with_admin_option─┐
│ bar       │ ᴺᵁᴸᴸ      │ role_b            │                       1 │                 0 │
│ bar       │ ᴺᵁᴸᴸ      │ role_a            │                       1 │                 0 │
│ foo       │ ᴺᵁᴸᴸ      │ role_a            │                       1 │                 0 │
└───────────┴───────────┴───────────────────┴─────────────────────────┴───────────────────┘

3 rows in set. Elapsed: 0.001 sec.

Log in as the user foo, then check the current user and roles:

Query

SELECT user();

Response

Query id: eee6eaaa-11bc-42c1-9258-fa3079ee6f80

┌─currentUser()─┐
│ foo           │
└───────────────┘

1 row in set. Elapsed: 0.001 sec.

Query

SHOW CURRENT ROLES;

Response

Query id: aa6a1ac1-3502-4960-bb34-f7d9f0d7986e

┌─role_name─┬─with_admin_option─┬─is_default─┐
│ role_a    │                 0 │          1 │
└───────────┴───────────────────┴────────────┘

1 row in set. Elapsed: 0.002 sec.

Log in as the user bar, then check the current user and roles:

Query

SELECT user();

Response

Query id: fa9ba47f-efcf-4491-9b4e-2f1130dfa84b

┌─currentUser()─┐
│ bar           │
└───────────────┘

1 row in set. Elapsed: 0.001 sec.

Query

SHOW CURRENT ROLES;

Response

Query id: fb3f2941-a8ce-481d-8fad-b775bfc5b532

┌─role_name─┬─with_admin_option─┬─is_default─┐
│ role_a    │                 0 │          1 │
│ role_b    │                 0 │          1 │
└───────────┴───────────────────┴────────────┘

2 rows in set. Elapsed: 0.001 sec.