Disallow SELinux

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: disallow-selinux
  annotations:
    policies.kyverno.io/title: Disallow SELinux
    policies.kyverno.io/category: Pod Security Standards (Baseline)
    policies.kyverno.io/severity: medium
    policies.kyverno.io/subject: Pod
    kyverno.io/kyverno-version: 1.6.0
    kyverno.io/kubernetes-version: 1.22-1.23
    policies.kyverno.io/description: SELinux options can be used to escalate privileges and should not be allowed. This policy ensures that the `seLinuxOptions` field is undefined.
spec:
  validationFailureAction: Audit
  background: true
  rules:
    - name: selinux-type
      match:
        any:
          - resources:
              kinds:
                - Pod
      validate:
        message: Setting the SELinux type is restricted. The fields spec.securityContext.seLinuxOptions.type, spec.containers[*].securityContext.seLinuxOptions.type, , spec.initContainers[*].securityContext.seLinuxOptions, and spec.ephemeralContainers[*].securityContext.seLinuxOptions.type must either be unset or set to one of the allowed values (container_t, container_init_t, or container_kvm_t).
        pattern:
          spec:
            "=(securityContext)":
              "=(seLinuxOptions)":
                "=(type)": container_t | container_init_t | container_kvm_t
            "=(ephemeralContainers)":
              - "=(securityContext)":
                  "=(seLinuxOptions)":
                    "=(type)": container_t | container_init_t | container_kvm_t
            "=(initContainers)":
              - "=(securityContext)":
                  "=(seLinuxOptions)":
                    "=(type)": container_t | container_init_t | container_kvm_t
            containers:
              - "=(securityContext)":
                  "=(seLinuxOptions)":
                    "=(type)": container_t | container_init_t | container_kvm_t
    - name: selinux-user-role
      match:
        any:
          - resources:
              kinds:
                - Pod
      validate:
        message: Setting the SELinux user or role is forbidden. The fields spec.securityContext.seLinuxOptions.user, spec.securityContext.seLinuxOptions.role, spec.containers[*].securityContext.seLinuxOptions.user, spec.containers[*].securityContext.seLinuxOptions.role, spec.initContainers[*].securityContext.seLinuxOptions.user, spec.initContainers[*].securityContext.seLinuxOptions.role, spec.ephemeralContainers[*].securityContext.seLinuxOptions.user, and spec.ephemeralContainers[*].securityContext.seLinuxOptions.role must be unset.
        pattern:
          spec:
            "=(securityContext)":
              "=(seLinuxOptions)":
                X(user): "null"
                X(role): "null"
            "=(ephemeralContainers)":
              - "=(securityContext)":
                  "=(seLinuxOptions)":
                    X(user): "null"
                    X(role): "null"
            "=(initContainers)":
              - "=(securityContext)":
                  "=(seLinuxOptions)":
                    X(user): "null"
                    X(role): "null"
            containers:
              - "=(securityContext)":
                  "=(seLinuxOptions)":
                    X(user): "null"
                    X(role): "null"