kyverno/charts/kyverno-policies/templates/baseline/disallow-host-path.yaml

{{- $name := "disallow-host-path" }}
{{- if eq (include "kyverno-policies.podSecurityBaseline" (merge (dict "name" $name) .)) "true" }}
apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: {{ $name }}
  annotations:
    policies.kyverno.io/title: Disallow hostPath
    policies.kyverno.io/category: Pod Security Standards (Baseline)
    {{- if .Values.podSecuritySeverity }}
    policies.kyverno.io/severity: {{ .Values.podSecuritySeverity }}
    {{- end }}
    policies.kyverno.io/subject: Pod,Volume
    kyverno.io/kyverno-version: 1.6.0
    kyverno.io/kubernetes-version: "1.22-1.23"
    policies.kyverno.io/description: >-
      HostPath volumes let Pods use host directories and volumes in containers.
      Using host resources can be used to access shared data or escalate privileges
      and should not be allowed. This policy ensures no hostPath volumes are in use.
spec:
  validationFailureAction: {{ .Values.validationFailureAction }}
  {{- with concat (index .Values "validationFailureActionOverrides" "all") (default list (index .Values "validationFailureActionOverrides" $name)) }}
  validationFailureActionOverrides: {{ toYaml . | nindent 4 }}
  {{- end }}
  background: true
  rules:
    - name: host-path
      match:
        any:
        - resources:
            kinds:
              - Pod
      {{- with index .Values "policyExclude" $name }}
      exclude:
        {{- toYaml . | nindent 8 }}
      {{- end }}
      validate:
        message: >-
          HostPath volumes are forbidden. The field spec.volumes[*].hostPath must be unset.
        pattern:
          spec:
            =(volumes):
              - X(hostPath): "null"
{{- end }}