3.13 Ensure that the Docker server certificate key file ownership is set to root:root

Information

You should verify that the Docker server certificate key file (the file that is passed along with the --tlskey parameter) is individually owned and group owned by root.

Rationale:

The Docker server certificate key file should be protected from any tampering or unneeded reads/writes. As it holds the private key for the Docker server certificate, it must be individually owned and group owned by root to ensure that it cannot be accessed by less privileged users.

Impact:

None.

Solution

You should execute the following command:

chown root:root <path to Docker server certificate key file>

This sets the individual ownership and group ownership for the Docker server certificate key file to root.

Default Value:

By default, the individual ownership and group ownership for the Docker server certificate key file is correctly set to root.

See Also

https://workbench.cisecurity.org/files/4532