Classification:

compliance

Framework:

cis-docker

Control:

3.12

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Set up the docker integration.

Description

You should verify that the Docker server certificate file, the file that is passed along with the --tlscert parameter, has permissions of 444 or more restrictive permissions.

Rationale

The Docker server certificate file should be protected from any tampering. It is used to authenticate the Docker server based on the given server certificate. It should therefore have permissions of 444 to prevent its modification.

Audit

Verify that the Docker server certificate file has permissions of 444 or more restrictive, by running:

stat -c %a <path to Docker server certificate file>

Remediation

Run the command below: chmod 444 <path to Docker server certificate file>

This sets the file permissions of the Docker server certificate file to 444.

Impact

None

Default value

By default, the permissions for the Docker server certificate file might not be 444. The default file permissions are governed by the operating system or user specific umask values.

References

1. https://docs.docker.com/registry/insecure/
2. https://docs.docker.com/engine/security/https/

CIS controls

Version 6

14.4 Protect Information With Access Control Lists - All information stored on systems shall be protected with file system, network share, claims, application, or database specific access control lists. These controls will enforce the principle that only authorized individuals should have access to the information based on their need to access the information as a part of their responsibilities.

Version 7

14.6 Protect Information through Access Control Lists - Protect all information stored on systems with file system, network share, claims, application, or database specific access control lists. These controls will enforce the principle that only authorized individuals should have access to the information based on their need to access the information as a part of their responsibilities.