HostPorts Enabled on Containers

apiVersion: rules.spotter.dev/v1alpha1
kind: SpotterRule
metadata:
  name: spotter-workload-010
  labels:
    severity: "critical"
    category: "workload"
  annotations:
    rules.spotter.dev/title: "HostPorts Enabled on Containers"
    rules.spotter.dev/version: "1.0.0"
    rules.spotter.dev/cwe: "CWE-732"
    rules.spotter.dev/description: "HostPorts should not be enabled on containers."
spec:
  match:
    resources:
      kubernetes:
        apiGroups:
          - ""
          - "apps"
        versions:
          - "v1"
        kinds:
          - Pod
          - Deployment
          - StatefulSet
          - DaemonSet
        namespaces:
          include: ["*"]
          exclude: ["kube-system", "kube-public"]
        labels:
          exclude:
            rules.spotter.dev/ignore: ["true"]
  cel: |
    (object.kind == 'Pod' && (
      (has(object.spec.containers) && object.spec.containers.exists(c, has(c.ports) && c.ports.exists(p, has(p.hostPort)))) ||
      (has(object.spec.initContainers) && object.spec.initContainers.exists(c, has(c.ports) && c.ports.exists(p, has(p.hostPort)))) ||
      (has(object.spec.ephemeralContainers) && object.spec.ephemeralContainers.exists(c, has(c.ports) && c.ports.exists(p, has(p.hostPort))))
    )) || (object.kind != 'Pod' && (
      (has(object.spec.template.spec.containers) && object.spec.template.spec.containers.exists(c, has(c.ports) && c.ports.exists(p, has(p.hostPort)))) ||
      (has(object.spec.template.spec.initContainers) && object.spec.template.spec.initContainers.exists(c, has(c.ports) && c.ports.exists(p, has(p.hostPort)))) ||
      (has(object.spec.template.spec.ephemeralContainers) && object.spec.template.spec.ephemeralContainers.exists(c, has(c.ports) && c.ports.exists(p, has(p.hostPort))))
    ))
  remediation:
    manual: "Never use hostPath volume mounts. Instead, use a read-only persistent volume claim (PVC) or a config map or secret."
  references:
    - title: "Volumes - hostPath"
      url: "https://kubernetes.io/docs/concepts/storage/volumes/#hostpath"