Cis Ocp V180 1.1.7

CIS Red Hat OpenShift Container Platform Benchmark v1.8.0 - Control 1.1.7

Profile Applicability

• Level: 1

Description

Ensure that the /etc/kubernetes/manifests/etcd.yaml file has permissions of 600 or more restrictive.

Rationale

The etcd pod specification file /etc/kubernetes/manifests/etcd.yaml controls various parameters that set the behavior of the etcd service in the master node. etcd is a highly-available key-value store which Kubernetes uses for persistent storage of all of its REST API object. You should restrict its file permissions to maintain the integrity of the file. The file should be writable by only the administrators on the system.

Impact

None.

Audit Procedure

In OpenShift 4, starting with OpenShift 4.4, the etcd pod specification file is generated by the cluster etcd operator. The default etcd pod specification file is available here: openshift/cluster-etcd-operator

Run the following command.

for i in $(oc get pods -n openshift-etcd -l app=etcd -o name | grep etcd )
do
  echo "check pod $i"
  oc rsh  -n openshift-etcd  $i \
        stat -c %a /etc/kubernetes/manifests/etcd-pod.yaml
done

Verify that the permissions are 600 or more restrictive.

Remediation

There is no remediation for updating the permissions of etcd-pod.yaml. The file is owned by an OpenShift operator and any changes to the file will result in a degraded cluster state. Please do not attempt to remediate the permissions of this file.

Default Value

By default, in OpenShift 4, /etc/kubernetes/manifests/etcd-pod.yaml file has permissions of 644.

By default, in OpenShift 4.14, the etcd-pod.yaml has permissions of 600.

In older versions of OpenShift, the etcd-pod.yaml has permissions of 644, and is not remediable. Please upgrade to OpenShift 4.14 when possible.

References

1. https://docs.openshift.com/container-platform/latest/architecture/control-plane.html#defining-masters_control-plane
2. https://github.com/openshift/cluster-etcd-operator/blob/master/bindata/etcd/pod.yaml
3. https://etcd.io/
4. https://kubernetes.io/docs/tasks/administer-cluster/configure-upgrade-etcd/
5. https://github.com/openshift/library-go/commit/19a42d2bae8ba68761cfad72bf764e10d275ad6e

CIS Controls

MITRE ATT&CK Mappings

Profile

Level 1 (Manual)