BSI IT-Grundschutz (Basic Protection) Building Block SYS.1.6 and APP.4.4

$ oc create sa service_account_name
       

$ oc describe clusterrolebindings

$ oc get --as="system:anonymous" --raw='/readyz?verbose'

$ oc get --as="system:anonymous" projects

"apiServerArguments": {
  ...
    "client-ca-file": [
      "/etc/kubernetes/static-pod-certs/configmaps/client-ca/ca-bundle.crt"
    ],
  ...

When you enable etcd encryption, the following OpenShift API server and Kubernetes API server resources are encrypted:

• Secrets
• ConfigMaps
• Routes
• OAuth access tokens
• OAuth authorize tokens

When you enable etcd encryption, encryption keys are created. These keys are rotated on a weekly basis. You must have these keys in order to restore from an etcd backup.

To ensure the correct cipher, set the encryption type to aescbc or aesgcm in the apiserver object which configures the API server itself.

spec:
  encryption:
    type: aescbc

For more information, follow the relevant documentation.

"apiServerArguments":{
...
  "kubelet-client-certificate":"/etc/kubernetes/static-pod-resources/secrets/kubelet-client/tls.crt",
...
}

"apiServerArguments":{
...
  "kubelet-client-key":"/etc/kubernetes/static-pod-resources/secrets/kubelet-client/tls.key",
...
}

"apiServerArguments":{
...
"tls-cert-file": [
  "/etc/kubernetes/static-pod-certs/secrets/service-network-serving-certkey/tls.crt"
],
...
}

"servingInfo":{
  ...
  "cipherSuites": [
    "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
    "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
    "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
    "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
    "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256",
    "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256",
  ],
  ...

"apiServerArguments":{
...
"tls-private-key-file": [
  "/etc/kubernetes/static-pod-certs/secrets/service-network-serving-certkey/tls.key"
],
...
}

oc patch apiservers.config.openshift.io cluster --type 'json' --patch '[{"op": "add", "path": "/spec/tlsSecurityProfile/intermediate", "value": {}}, {"op": "replace", "path": "/spec/tlsSecurityProfile/type", "value": "Intermediate"}, {"op": "remove", "path": "/spec/tlsSecurityProfile/old"}]'

Back up your clusters etcd data regularly and store in a secure location ideally outside the OpenShift Container Platform environment. Do not take an etcd backup before the first certificate rotation completes, which occurs 24 hours after installation, otherwise the backup will contain expired certificates. It is also recommended to take etcd backups during non-peak usage hours because the etcd snapshot has a high I/O cost.

For more information, follow the relevant documentation.

$ oc get pod -o=custom-columns=NAME:.metadata.name,NAMESPACE:.metadata.namespace,APP:.metadata.labels.app\.kubernetes\.io/name,NODE:.spec.nodeName --all-namespaces | grep -v "openshift-" 

tlsCertFile: /path/to/TLS/cert.key

tlsPrivateKeyFile: /path/to/TLS/private.key

RBAC is a critical feature in terms of security for Kubernetes and OpenShift. It enables administrators to segment the privileges granted to a service account, and thus allows us to limit the access to resources that they get. By defining cluster roles appropriately one is able to codify organizational policy. [1]

[1] https://docs.openshift.com/container-platform/latest/authentication/using-rbac.html

RBAC is a critical feature in terms of security for Kubernetes and OpenShift. It enables administrators to segment the privileges granted to a service account, and thus allows us to limit the access to resources that they get. By defining roles appropriately one is able to codify organizational policy. [1]

[1] https://docs.openshift.com/container-platform/latest/authentication/using-rbac.html

oc patch

/tmp/allowed-registries-patch.yaml

spec:
  registrySources:
    allowedRegistries:
    - my-trusted-registry.internal.example.com

oc patch image.config.openshift.io cluster --patch="$(cat /tmp/allowed-registries-patch.yaml)" --type=merge

oc patch

/tmp/allowed-import-registries-patch.yaml

spec:
  allowedRegistriesForImport:
  - domainName: my-trusted-registry.internal.example.com
    insecure: false

oc patch image.config.openshift.io cluster --patch="$(cat /tmp/allowed-import-registries-patch.yaml)" --type=merge

oc get image.config.openshift.io/cluster -o json | jq '.spec | (.allowedRegistriesForImport[])? | select(.insecure==true)'

oc edit image.config.openshift.io/cluster

oc patch image.config.openshift.io cluster --type=json -p "[{'op': 'remove', 'path': '/spec/registrySources/insecureRegistries'}]"

Containers should not enable more capabilites than needed as this opens the door for malicious use. To enable only the required capabilities, the appropriate Security Context Constraints (SCCs) should set capabilities as a list in allowedCapabilities.

In case an SCC outside the default allow list in the variable var-sccs-with-allowed-capabilities-regex is being flagged, create a TailoredProfile and add the additional SCC to the regular expression in the variable var-sccs-with-allowed-capabilities-regex. An example allowing an SCC named additional follows:

apiVersion: compliance.openshift.io/v1alpha1
kind: TailoredProfile
metadata:
  name: cis-additional-scc
spec:
  description: Allows an additional scc
  setValues:
  - name: ocp4-var-sccs-with-allowed-capabilities-regex
    rationale: Allow our own custom SCC
    value: ^privileged$|^hostnetwork-v2$|^restricted-v2$|^nonroot-v2$|^additional$
  extends: ocp4-cis
  title: Modified CIS allowing one more SCC

Finally, reference this TailoredProfile in a ScanSettingBinding For more information on Tailoring the Compliance Operator, please consult the OpenShift documentation: https://docs.openshift.com/container-platform/latest/security/compliance_operator/co-scans/compliance-operator-tailor.html