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cis-docker-1.1.5

DevOps & Security
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Ensure auditing is configured for Docker files and directories - /var/lib/docker

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Ensure auditing is configured for Docker files and directories - /var/lib/docker (Manual)

Description

Audit /var/lib/docker or data-root.

Rationale

As well as auditing the normal 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 behaviour depends on some key files and directories. /var/lib/docker is one such directory. As it holds all the information about containers it should be audited.

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.

Audit

You should verify that there is an audit rule applied to the /var/lib/docker directory or whatever your data-root directory is set to.

You can configure the Docker daemon to use a different directory, using the data-root configuration option. For example:

{
  "data-root": "/mnt/docker-data"
}

To perform an audit execute the command below:

auditctl -l | grep /var/lib/docker

or

auditctl -l | grep data-root

This should list a rule for the /var/lib/docker directory.

Remediation

You should add a rule for the /var/lib/docker directory.

Adding exclusions for /var/lib/docker/overlay2 & /var/lib/docker/volumes reduces the audit messages to a more manageable level.

For example, Add the line as below to the /etc/audit/rules.d/audit.rules file:

-a exit,always -F path=/var/lib/docker -F perm=war -k docker
-a exit,never -F dir=/var/lib/docker/volumes
-a exit,never -F dir=/var/lib/docker/overlay2

or for systems with namespace-remapping enabled

-a exit,always -F path=/var/lib/docker -F perm=war -k docker
-a exit,never -F dir=/var/lib/165536.165536/volumes
-a exit,never -F dir=/var/lib/docker/165536.165536/overlay2

Then, restart the audit daemon using the following command

systemctl restart auditd

Default Value

By default, Docker related files and directories are not audited.

References

  1. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/system_design_guide/auditing-the-system_system-design-guide
  2. https://docs.docker.com/engine/daemon/#daemon-data-directory

CIS Controls

Controls Version | Control | IG 1 | IG 2 | IG 3

v8 | 8.5 Collect Detailed Audit Logs Configure detailed audit logging for enterprise assets containing sensitive data. Include event source, date, username, timestamp, source addresses, destination addresses, and other useful elements that could assist in a forensic investigation. | | ● | ●

v7 | 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). | | | ●

Profile

• Level 1 - Docker - Linux