opendesk/.kyverno/policies/disallow-host-process.yaml

# SPDX-FileCopyrightText: 2024 Bundesministerium des Innern und für Heimat, PG ZenDiS "Projektgruppe für Aufbau ZenDiS"
# SPDX-License-Identifier: Apache-2.0
---
apiVersion: "kyverno.io/v1"
kind: "ClusterPolicy"
metadata:
  name: "disallow-host-process"
  annotations:
    policies.kyverno.io/title: "Disallow hostProcess"
    policies.kyverno.io/subject: "Pod"
    policies.kyverno.io/description: >-
      Windows pods offer the ability to run HostProcess containers which enables privileged access to the Windows node.
      Privileged access to the host is disallowed in the baseline policy.
      HostProcess pods are an alpha feature as of Kubernetes v1.22.
      This policy ensures the `hostProcess` field, if present, is set to `false`.
spec:
  background: true
  rules:
    - name: "disallow-host-process"
      match:
        any:
          - resources:
              kinds:
                - "Pod"
      validate:
        message: >-
          HostProcess containers are disallowed. The fields spec.securityContext.windowsOptions.hostProcess,
          spec.containers[*].securityContext.windowsOptions.hostProcess,
          spec.initContainers[*].securityContext.windowsOptions.hostProcess, and
          spec.ephemeralContainers[*].securityContext.windowsOptions.hostProcess must either be undefined or set to
          `false`.
        pattern:
          spec:
            =(ephemeralContainers):
              - =(securityContext):
                  =(windowsOptions):
                    =(hostProcess): "false"
            =(initContainers):
              - =(securityContext):
                  =(windowsOptions):
                    =(hostProcess): "false"
            containers:
              - =(securityContext):
                  =(windowsOptions):
                    =(hostProcess): "false"