cis-ocp-v160-1.2.4

DevOps & Security

Use https for kubelet connections (Manual)

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CIS Red Hat OpenShift Container Platform Benchmark v1.6.0 - Control 1.2.4

Profile Applicability

Level: 1

Description

Use https for kubelet connections.

Rationale

Connections from apiserver to kubelets could potentially carry sensitive data such as secrets and keys. It is thus important to use in-transit encryption for any communication between the apiserver and kubelets.

Impact

You require TLS to be configured on apiserver as well as kubelets.

Audit Procedure

OpenShift does not use the --kubelet-https argument. OpenShift utilizes X.509 certificates for authentication of the control-plane components. OpenShift configures the API server to use an internal certificate authority (CA) to validate the user certificate sent during TLS negotiation. If the validation of the certificate is successful, the request is authenticated and user information is derived from the certificate subject fields.

To verify the kubelet client certificates are present, run the following command:

oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | jq '.apiServerArguments["kubelet-client-certificate"]'

oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | jq '.apiServerArguments["kubelet-client-key"]'

oc -n openshift-apiserver describe secret serving-cert

# Run the following command and the output should return true or no output at all
oc get configmap config -n openshift-kube-apiserver -ojson | jq -r '.data["config.yaml"]' | jq '.apiServerArguments["kubelet-https"]'

Verify that the kubelet client-certificate and kubelet client-key files are present. client-certificate: /etc/kubernetes/static-pod-resources/kube-apiserver-certs/secrets/kubelet-client/tls.crt client-key: /etc/kubernetes/static-pod-resources/kube-apiserver-certs/secrets/kubelet-client/tls.key Verify that the serving-cert for the openshift-apiserver is type kubernetes.io/tls and that returned Data includes tls.crt and tls.key.

Remediation

No remediation is required. OpenShift platform components use X.509 certificates for authentication. OpenShift manages the CAs and certificates for platform components. This is not configurable.

Default Value

By default, kubelet connections are encrypted.

References

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.10 Encrypt Sensitive Data in Transit		x	x
v7	14.4 Encrypt All Sensitive Information in Transit		x	x

MITRE ATT&CK Mappings

Techniques / Sub-techniques	Tactics	Mitigations
T1048, T1189	TA0001, TA0010	M1041

Profile

Level 1 (Manual)