Enable Authorization

Authorization is the process by where users are granted permissions which entitle them to access or change data on specific keyspaces, tables or an entire datacenter. Authorization for Scylla is done internally within Scylla and is not done with a third party such as LDAP or OAuth. Granting permissions to users requires the use of a role such as Database Administrator and requires a user who has been authenticated.

Authorization is enabled using the authorizer setting in scylla.yaml. Scylla has two authorizers available:

  • AllowAllAuthorizer (default setting) - which performs no checking and so effectively grants all permissions to all roles. This must be used if AllowAllAuthenticator is the configured authenticator.
  • CassandraAuthorizer - which implements permission management functionality and stores its data in Scylla system tables.

Enabling Authorization

Permissions are modeled as a whitelist, and as such, a given role has no access to any database resource, unless specified. The implication of this is that once authorization is enabled on a node, all requests will be rejected until the required permissions have been granted. For this reason, it is strongly recommended to perform the initial setup on a node which is not processing client requests.

The following assumes that authentication has already been enabled via the process outlined in Enable Authentication. Perform these steps to enable internal authorization across the cluster:

  1. Configure the authorizer as CassandraAuthorizer
  2. Set your credentials as the superuser
  3. Login to cqlsh as the superuser and set roles and priviledges for your users
  4. Confirm users can access the client with their new credentials.
  5. Remove Cassandra default user / passwords

Configure the Authorizer

It is highly recommended to perform this action on a node which is not processing client requests.

Procedure

  1. On the selected node, edit scylla.yaml to change the authorizer option to CassandraAuthorizer:
authorizer: CassandraAuthorizer
  1. Restart the node. This will set the authorization.

CentOS, RHEL or Ubuntu 16.04

sudo systemctl restart scylla-server

Ubuntu 14.04 or Debian

sudo service scylla-server restart

Docker (without restarting some-scylla container)

docker exec -it some-scylla supervisorctl restart scylla

Set a Superuser

By default the superuser credentials are username cassandra, password cassandra. This is not secure. It is highly advised to change this to a unique username and password combination.

Procedure

  1. Start cqlsh with the default superuser settings.
cqlsh -u cassandra -p cassandra
  1. Create a role for the superuser which has all priviledges
CREATE ROLE <role-name> WITH SUPERUSER = true;
CREATE ROLE DBA WITH SUPERUSER = true;

Note

This role already has complete read and write permissions on all tables and keyspaces and does not need to be granted anything else. The superuser permission setting is by default disabled. Only for the administrator does it need to be enabled.

  1. Assign that role to yourself and grant login priviledges
CREATE ROLE <user> WITH PASSWORD = 'password' AND SUPERUSER = true AND LOGIN = true;

For example (John is the DBA)

CREATE ROLE john WITH PASSWORD = '39fksah!' AND LOGIN = true;
GRANT DBA TO john;
  1. Exit cqlsh and login again with the new credentials
cqlsh> exit
cqlsh -u new-username -p new-password

For example:

cqlsh> exit
cqlsh -u john -p 39fksah!

Create Additional Roles

In order for the users on your system to be able to login and perform actions, you as the DBA will have to create roles and priviledges.

Before you Begin Validate you have set the Authenticator as described in Authentication. Validate you have the credentials for the superuser for your system for yourself.

  1. Open a new cqlsh session using the credentials of a role with superuser credentials. For example:
cqlsh -u dba -p 39fksah!
  1. Configure the appropriate access privileges for clients using GRANT PERMISSION statements. For additional examples consult the RBAC example.

In this example you are creating a user (db_user) with password (password) and granting this role to the role named client who has select permissions on the ks.t1 table.

CREATE ROLE db_user WITH PASSWORD = 'password' AND LOGIN = true;
CREATE ROLE client;
GRANT SELECT ON ks.t1 TO client;
GRANT client TO db_user;
  1. Continue in this manner to grant permissions for all users.

Clients Resume Access with New Permissions

  1. Restart Scylla. As each node restarts and clients reconnect, the enforcement of the granted permissions will begin.

CentOS, RHEL or Ubuntu 16.04

sudo systemctl restart scylla-server

Ubuntu 14.04 or Debian

sudo service scylla-server restart

Docker (without restarting some-scylla container)

docker exec -it some-scylla supervisorctl restart scylla

The following should be noted:

  • Clients are not be able to connect until you setup roles as users with passwords using GRANT PERMISSION statements (using the superuser). Refer to the example in Role Based Access Control (RBAC) for details.
  • When initiating a connection, clients will need to use the user name and password that you assign
  • Confirm all clients can connect before removing the Cassandra default password and user.
  1. To remove permission from any role or user, see REVOKE PERMISSION.

Remove Cassandra Default Password and User

To prevent others from entering with the old superuser password you can and should delete it.

DROP ROLE [ IF EXISTS ] 'old-username';

For example

DROP ROLE [ IF EXISTS ] 'cassandra';

Additional References