require-run-as-nonroot.yaml

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: require-run-as-nonroot
  annotations:
    policies.kyverno.io/title: Require runAsNonRoot
    policies.kyverno.io/category: Pod Security Standards (Restricted)
    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: >-
      Containers must be required to run as non-root users. This policy ensures
      `runAsNonRoot` is set to `true`. A known issue prevents a policy such as this
      using `anyPattern` from being persisted properly in Kubernetes 1.23.0-1.23.2.
spec:
  validationFailureAction: audit
  background: true
  rules:
    - name: run-as-non-root
      match:
        any:
        - resources:
            kinds:
              - Pod
      validate:
        message: >-
          Running as root is not allowed. Either the field spec.securityContext.runAsNonRoot
          must be set to `true`, or the fields spec.containers[*].securityContext.runAsNonRoot,
          spec.initContainers[*].securityContext.runAsNonRoot, and spec.ephemeralContainers[*].securityContext.runAsNonRoot
          must be set to `true`.
        anyPattern:
        - spec:
            securityContext:
              runAsNonRoot: "true"
            =(ephemeralContainers):
            - =(securityContext):
                =(runAsNonRoot): "true"
            =(initContainers):
            - =(securityContext):
                =(runAsNonRoot): "true"
            containers:
            - =(securityContext):
                =(runAsNonRoot): "true"
        - spec:
            =(ephemeralContainers):
            - securityContext:
                runAsNonRoot: "true"
            =(initContainers):
            - securityContext:
                runAsNonRoot: "true"
            containers:
            - securityContext:
                runAsNonRoot: "true"