kube-bench/cfg/gke-1.4.0/policies.yaml

---
controls:
version: "gke-1.4.0"
id: 4
text: "Kubernetes Policies"
type: "policies"
groups:
  - id: 4.1
    text: "RBAC and Service Accounts"
    checks:
      - id: 4.1.1
        text: "Ensure that the cluster-admin role is only used where required (Manual)"
        type: "manual"
        remediation: |
          Identify all clusterrolebindings to the cluster-admin role. Check if they are used and
          if they need this role or if they could use a role with fewer privileges.
          Where possible, first bind users to a lower privileged role and then remove the
          clusterrolebinding to the cluster-admin role :
          kubectl delete clusterrolebinding [name]
        scored: false

      - id: 4.1.2
        text: "Minimize access to secrets (Manual)"
        type: "manual"
        remediation: |
          Where possible, remove get, list and watch access to secret objects in the cluster.
        scored: false

      - id: 4.1.3
        text: "Minimize wildcard use in Roles and ClusterRoles (Manual)"
        type: "manual"
        remediation: |
          Where possible replace any use of wildcards in clusterroles and roles with specific
          objects or actions.
        scored: false

      - id: 4.1.4
        text: "Minimize access to create pods (Manual)"
        type: "manual"
        remediation: |
          Where possible, remove create access to pod objects in the cluster.
        scored: false

      - id: 4.1.5
        text: "Ensure that default service accounts are not actively used. (Manual)"
        type: "manual"
        remediation: |
          Create explicit service accounts wherever a Kubernetes workload requires specific access
          to the Kubernetes API server.
          Modify the configuration of each default service account to include this value
          automountServiceAccountToken: false
        scored: true

      - id: 4.1.6
        text: "Ensure that Service Account Tokens are only mounted where necessary (Manual)"
        type: "manual"
        remediation: |
          Modify the definition of pods and service accounts which do not need to mount service
          account tokens to disable it.
        scored: false

  - id: 4.2
    text: "Pod Security Standards"
    checks:
      - id: 4.2.1
        text: "Minimize the admission of privileged containers (Manual)"
        type: "manual"
        remediation: |
          Add policies to each namespace in the cluster which has user workloads
          to restrict the admission of privileged containers.
        scored: false

      - id: 4.2.2
        text: "Minimize the admission of containers wishing to share the host process ID namespace (Manual)"
        type: "manual"
        remediation: |
          Add policies to each namespace in the cluster which has user workloads
          to restrict the admission of hostPID containers.
        scored: false

      - id: 4.2.3
        text: "Minimize the admission of containers wishing to share the host IPC namespace (Manual)"
        type: "manual"
        remediation: |
          Add policies to each namespace in the cluster which has user workloads
          to restrict the admission of hostIPC containers.
        scored: false

      - id: 4.2.4
        text: "Minimize the admission of containers wishing to share the host network namespace (Manual)"
        type: "manual"
        remediation: |
          Add policies to each namespace in the cluster which has user workloads
          to restrict the admission of hostNetwork containers.
        scored: false

      - id: 4.2.5
        text: "Minimize the admission of containers with allowPrivilegeEscalation (Manual)"
        type: "manual"
        remediation: |
          Add policies to each namespace in the cluster which has user workloads
          to restrict the admission of containers with .spec.allowPrivilegeEscalation set to true.
        scored: false

      - id: 4.2.6
        text: "Minimize the admission of root containers (Manual)"
        type: "manual"
        remediation: |
          Create a policy for each namespace in the cluster,
          ensuring that either MustRunAsNonRoot or MustRunAs with the range of UIDs not including 0, is set.
        scored: false

      - id: 4.2.7
        text: "Minimize the admission of containers with added capabilities (Manual)"
        type: "manual"
        remediation: |
          Ensure that allowedCapabilities is not present in policies for the cluster unless
          it is set to an empty array.
        scored: false

      - id: 4.2.8
        text: "Minimize the admission of containers with capabilities assigned (Manual) "
        type: "manual"
        remediation: |
          Review the use of capabilities in applications running on your cluster. Where a namespace
          contains applications which do not require any Linux capabilities to operate consider adding
          a policy which forbids the admission of containers which do not drop all capabilities.
        scored: false

  - id: 4.3
    text: "Network Policies and CNI"
    checks:
      - id: 4.3.1
        text: "Ensure that the CNI in use supports Network Policies (Manual)"
        type: "manual"
        remediation: |
          To use a CNI plugin with Network Policy, enable Network Policy in GKE, and the CNI plugin
          will be updated. See Recommendation 6.6.7.
        scored: false

      - id: 4.3.2
        text: "Ensure that all Namespaces have Network Policies defined (Manual)"
        type: "manual"
        remediation: |
          Follow the documentation and create NetworkPolicy objects as you need them.
        scored: false

  - id: 4.4
    text: "Secrets Management"
    checks:
      - id: 4.4.1
        text: "Prefer using secrets as files over secrets as environment variables (Manual)"
        type: "manual"
        remediation: |
          if possible, rewrite application code to read secrets from mounted secret files, rather than
          from environment variables.
        scored: false

      - id: 4.4.2
        text: "Consider external secret storage (Manual)"
        type: "manual"
        remediation: |
          Refer to the secrets management options offered by your cloud provider or a third-party
          secrets management solution.
        scored: false

  - id: 4.5
    text: "Extensible Admission Control"
    checks:
      - id: 4.5.1
        text: "Configure Image Provenance using ImagePolicyWebhook admission controller (Manual)"
        type: "manual"
        remediation: |
          Follow the Kubernetes documentation and setup image provenance.
          See also Recommendation 6.10.5 for GKE specifically.
        scored: false

  - id: 4.6
    text: "General Policies"
    checks:
      - id: 4.6.1
        text: "Create administrative boundaries between resources using namespaces (Manual)"
        type: "manual"
        remediation: |
          Follow the documentation and create namespaces for objects in your deployment as you need
          them.
        scored: false

      - id: 4.6.2
        text: "Ensure that the seccomp profile is set to docker/default in your pod definitions (Manual)"
        type: "manual"
        remediation: |
          Seccomp is an alpha feature currently. By default, all alpha features are disabled. So, you
          would need to enable alpha features in the apiserver by passing "--feature-
          gates=AllAlpha=true" argument.
          Edit the /etc/kubernetes/apiserver file on the master node and set the KUBE_API_ARGS
          parameter to "--feature-gates=AllAlpha=true"
          KUBE_API_ARGS="--feature-gates=AllAlpha=true"
          Based on your system, restart the kube-apiserver service. For example:
          systemctl restart kube-apiserver.service
          Use annotations to enable the docker/default seccomp profile in your pod definitions. An
          example is as below:
          apiVersion: v1
          kind: Pod
          metadata:
            name: trustworthy-pod
            annotations:
              seccomp.security.alpha.kubernetes.io/pod: docker/default
          spec:
            containers:
              - name: trustworthy-container
                image: sotrustworthy:latest
        scored: false

      - id: 4.6.3
        text: "Apply Security Context to Your Pods and Containers (Manual)"
        type: "manual"
        remediation: |
          Follow the Kubernetes documentation and apply security contexts to your pods. For a
          suggested list of security contexts, you may refer to the CIS Security Benchmark for Docker
          Containers.
        scored: false

      - id: 4.6.4
        text: "The default namespace should not be used (Manual)"
        type: "manual"
        remediation: |
          Ensure that namespaces are created to allow for appropriate segregation of Kubernetes
          resources and that all new resources are created in a specific namespace.
        scored: false