MEDIUM M10: API Server Encryption P2

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Overview

This remediation enables encryption at rest for etcd data in the OpenShift API server, protecting sensitive data stored in the cluster’s key-value store.

Settings

Setting	Value	Description
`encryption.type`	`aescbc`	Enable AES-CBC encryption at rest

Implementation

This requires modifying the APIServer custom resource:

apiVersion: config.openshift.io/v1
kind: APIServer
metadata:
  name: cluster
spec:
  encryption:
    type: aescbc

Apply with:

oc patch apiserver cluster --type merge -p '{"spec":{"encryption":{"type":"aescbc"}}}'

Compliance Checks Remediated

Check	Profile	Docs
`ocp4-cis-api-server-encryption-provider-cipher`	CIS	📖
`ocp4-e8-api-server-encryption-provider-cipher`	E8	📖

Source Remediation Files

medium/ocp4-cis-api-server-encryption-provider-cipher.yaml
medium/ocp4-e8-api-server-encryption-provider-cipher.yaml

Verification

Check encryption status:

oc get apiserver cluster -o jsonpath='{.spec.encryption.type}'
# Expected: aescbc

# Verify encryption is active
oc get openshiftapiserver -o=jsonpath='{range .items[0].status.conditions[?(@.type=="Encrypted")]}{.type}{" "}{.status}{" "}{.reason}{"\n"}{end}'

Security Impact

Encryption at rest ensures:

Secrets stored in etcd are encrypted
Stolen etcd backups are protected
Compliance with data protection requirements
Defense in depth for sensitive configuration

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