20.7. Deauthorizing a Client

To revoke the authorization of a client to access the Red Hat Gluster Storage trusted storage pool, you can do any of the following:
  • Remove an authorized client from the allowed list
  • Revoke SSL/TLS certificate authorization through a certificate revocation list (CRL)

20.7.1. To Remove an Authorized Client From the Allowed List

Procedure 20.12. Removing an authorized client from the allowed list

  1. List currently authorized clients and servers

    $ gluster volume get VOLNAME auth.ssl-allow
    For example, the following command shows that there are three authorized servers and five authorized clients. 
    $ gluster volume get sample_volname auth.ssl-allow
server1,server2,server3,client1,client2,client3,client4,client5

  2. Remove clients to deauthorize from the output

    For example, if you want to deauthorize client2 and client4, copy the string and remove those clients from the list. 
    server1,server2,server3,client1,client3,client5

  3. Set the new list of authorized clients and servers

    Set the value of auth.ssl-allow to your updated string. 
    $ gluster volume set VOLNAME auth.ssl-allow <list_of_systems>
    For example, the updated list shows three servers and three clients. 
    $ gluster volume set sample_volname auth.ssl-allow server1,server2,server3,client1,client3,client5

20.7.2. To Revoke SSL/TLS Certificate Authorization Using a SSL Certificate Revocation List

To protect the cluster from malicious or unauthorized network entities, you can specify a path to a directory containing SSL certificate revocation list (CRL) using the ssl.crl-path option. The path containing the list of revoked certificates enables server nodes to stop the nodes with revoked certificates from accessing the cluster.
For example, you can provide the path to a directory containing CRL with the volume set command as follows: 
$ gluster volume set vm-images ssl.crl-path /etc/ssl/

Note

Only the CA signed certificates can be revoked and not the self-signed certificates
To set up the CRL files, perform the following:
  1. Copy the CRL files to a directory.
  2. Change directory to the directory containing CRL files.
  3. Compute hashes to the CRL files using the c_rehash utility. 
    $ c_rehash .
    The hash and symbolic linking can be done using the c_rehash utility, which is available through the openssl-perl RPM. The name of the symbolic link must be the hash of the Common Name. For more information, see the crl man page.
  4. Set the ssl.crl-path volume option. 
    $ gluster volume set VOLNAME ssl.crl-path path-to-directory
    where, path-to-directory has to be an absolute name of the directory that hosts the CRL files.