kyverno/charts/kyverno-policies/templates/restricted/disallow-privilege-escalation.yaml

{{- $name := "disallow-privilege-escalation" }}
{{- if eq (include "kyverno-policies.podSecurityRestricted" (merge (dict "name" $name) .)) "true" }}
apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: {{ $name }}
  annotations:
    policies.kyverno.io/title: Disallow Privilege Escalation
    policies.kyverno.io/category: Pod Security Standards (Restricted)
    {{- if .Values.podSecuritySeverity }}
    policies.kyverno.io/severity: {{ .Values.podSecuritySeverity | quote }}
    {{- end }}
    policies.kyverno.io/subject: Pod
    kyverno.io/kyverno-version: 1.6.0
    kyverno.io/kubernetes-version: "1.22-1.23"
    policies.kyverno.io/description: >-
      Privilege escalation, such as via set-user-ID or set-group-ID file mode, should not be allowed.
      This policy ensures the `allowPrivilegeEscalation` field is set to `false`.
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: privilege-escalation
      match:
        any:
        - resources:
            kinds:
              - Pod
      {{- with index .Values "policyExclude" $name }}
      exclude:
        {{- toYaml . | nindent 8 }}
      {{- end }}
      validate:
        message: >-
          Privilege escalation is disallowed. The fields
          spec.containers[*].securityContext.allowPrivilegeEscalation,
          spec.initContainers[*].securityContext.allowPrivilegeEscalation,
          and spec.ephemeralContainers[*].securityContext.allowPrivilegeEscalation
          must be set to `false`.
        pattern:
          spec:
            =(ephemeralContainers):
            - securityContext:
                allowPrivilegeEscalation: "false"
            =(initContainers):
            - securityContext:
                allowPrivilegeEscalation: "false"
            containers:
            - securityContext:
                allowPrivilegeEscalation: "false"
{{- end }}