Cis Ocp V160 1.2.18

CIS Red Hat OpenShift Container Platform Benchmark v1.6.0 - Control 1.2.18

Profile Applicability

• Level: 1

Description

Do not disable the secure port.

Rationale

The secure port is used to serve https with authentication and authorization. If you disable it, no https traffic is served and all traffic is served unencrypted.

Impact

You need to set the API Server up with the right TLS certificates.

Audit Procedure

The openshift-kube-apiserver is served over HTTPS with authentication and authorization; the secure API endpoint is bound to 0.0.0.0:6443 by default. In OpenShift, the only supported way to access the API server pod is through the load balancer and then through the internal service. The value is set by the bindAddress argument under the servingInfo parameter.

Run the following command:

oc get kubeapiservers.operator.openshift.io cluster -o json | jq '.spec.observedConfig.servingInfo.bindAddress'

Verify the bind address is 0.0.0.0:6443.

oc get pods -n openshift-kube-apiserver -l app=openshift-kube-apiserver -o jsonpath='{.items[*].spec.containers[?(@.name=="kube-apiserver")].ports[*].containerPort}'

Verify the ports returned are 6443.

Remediation

None.

Default Value

By default, the openshift-kube-apiserver is served over HTTPS with authentication and authorization; the secure API endpoint is bound to 0.0.0.0:6443. Note that the openshift-apiserver is not running in the host network namespace. The port is not exposed on the node, but only through the pod network.

The OpenShift platform manages the TLS certificates for the API servers. External access is only available through the load balancer and then through the internal service.

References

1. https://github.com/openshift/cluster-kube-apiserver-operator/blob/release-4.6/bindata/v4.1.0/config/defaultconfig.yaml#L102-L103
2. https://github.com/openshift/cluster-kube-apiserver-operator/blob/release-4.5/bindata/v4.1.0/config/defaultconfig.yaml#L103-L105
3. https://docs.openshift.com/container-platform/latest/operators/operator-reference.html#kube-apiserver-operator_red-hat-operators
4. https://docs.openshift.com/container-platform/latest/operators/operator-reference.html#openshift-apiserver-operator_red-hat-operators
5. https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/

CIS Controls

MITRE ATT&CK Mappings

Profile

Level 1 (Manual)