| name | cis-ocp-v170-1.2.18 |
| description | Ensure that the --secure-port argument is not set to 0 (Manual) |
| category | cis-openshift |
| version | 1.7.0 |
| author | cyberstrike-official |
| tags | ["cis","openshift","kubernetes","redhat","control-plane","api-server"] |
| cis_id | 1.2.18 |
| cis_benchmark | CIS Red Hat OpenShift Container Platform Benchmark v1.7.0 |
| tech_stack | ["kubernetes","openshift","redhat"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
CIS Red Hat OpenShift Container Platform Benchmark v1.7.0 - Control 1.2.18
Profile Applicability
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
- https://github.com/openshift/cluster-kube-apiserver-operator/blob/release-4.6/bindata/v4.1.0/config/defaultconfig.yaml#L102-L103
- https://github.com/openshift/cluster-kube-apiserver-operator/blob/release-4.5/bindata/v4.1.0/config/defaultconfig.yaml#L103-L105
