Classification:

compliance

Framework:

cis-docker

Control:

1.2.10

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Set up the docker integration.

Description

Audit /etc/docker/daemon.json, if applicable.

Rationale

As well as auditing the Linux file system and system calls, you should also audit all Docker-related files and directories. The Docker daemon runs with root privileges and its behavior depends on some key files and directories, including /etc/docker/daemon.json. This holds various parameters for the Docker daemon, and so it should be audited.

Audit

Verify that there is an audit rule associated with the /etc/docker/daemon.json file. To display the rule for the /etc/docker/daemon.json file, run:

auditctl -l | grep /etc/docker/daemon.json

Remediation

You should add a rule for the /etc/docker/daemon.json file. For example, add the following line to a new file in /etc/audit/rules.d/. For instance, create a file named docker.rules:

echo "-w /etc/docker/daemon.json -k docker" > /etc/audit/rules.d/docker.rules

Then, reload the audit rules:

augenrules --load

Next, restart the audit daemon using the following command:

service auditd restart

Impact

Auditing can generate large log files. You should ensure that these are rotated and archived periodically. A separate partition should also be created for audit logs to avoid filling up any other critical partition.

Default value

By default, Docker-related files and directories are not audited. The file /etc/docker/daemon.json may not exist on the system and in that case, this recommendation is not applicable.

References

1. https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Security_Guide/chap-system_auditing.html
2. https://docs.docker.com/engine/reference/commandline/dockerd/#daemon-configuration-file

CIS controls

Version 6.14.6 Enforce Detailed Audit Logging For Sensitive Information - Enforce detailed audit logging for access to nonpublic data and special authentication for sensitive data.

Version 7.14.9 Enforce Detail Logging for Access or Changes to Sensitive Data - Enforce detailed audit logging for access to sensitive data or changes to sensitive data (utilizing tools such as File Integrity Monitoring or Security Information and Event Monitoring).