Docker Enterprise registry certificate file permissions must be set to 444 or more restrictive.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-235858	DKER-EE-005240	SV-235858r627701_rule		Medium

Description
Verify that all the registry certificate files (usually found under /etc/docker/certs.d/<registry-name> directory) have permissions of 444 or more restrictive. /etc/docker/certs.d/<registry-name> directory contains Docker registry certificates. These certificate files must have permissions of 444 to maintain the integrity of the certificates. By default, the permissions for registry certificate files might not be 444. The default file permissions are governed by the system or user specific umaskvalues.

Description

Verify that all the registry certificate files (usually found under /etc/docker/certs.d/<registry-name> directory) have permissions of 444 or more restrictive. /etc/docker/certs.d/<registry-name> directory contains Docker registry certificates. These certificate files must have permissions of 444 to maintain the integrity of the certificates. By default, the permissions for registry certificate files might not be 444. The default file permissions are governed by the system or user specific umaskvalues.

STIG	Date
Docker Enterprise 2.x Linux/UNIX Security Technical Implementation Guide	2021-03-26

Details

Check Text ( C-39077r627699_chk )
Ensure that registry certificate file permissions are set to 444 or more restrictive. Execute the below command to verify that the registry certificate files have permissions of 444 or more restrictive: stat -c %a /etc/docker/certs.d//* If the permissions are not set to 444, this is a finding.

Fix Text (F-39040r627700_fix)
Set the permissions for registry certificate files to 444. Run the following command: chmod 444 /etc/docker/certs.d//*