Require Run As Non-Root User

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: require-run-as-non-root-user
 5  annotations:
 6    policies.kyverno.io/title: Require Run As Non-Root User
 7    policies.kyverno.io/category: Pod Security Standards (Restricted)
 8    policies.kyverno.io/severity: medium
 9    policies.kyverno.io/subject: Pod
10    kyverno.io/kyverno-version: 1.6.0
11    kyverno.io/kubernetes-version: "1.22-1.23"
12    policies.kyverno.io/description: >-
13      Containers must be required to run as non-root users. This policy ensures
14      `runAsUser` is either unset or set to a number greater than zero.      
15spec:
16  validationFailureAction: audit
17  background: true
18  rules:
19    - name: run-as-non-root-user
20      match:
21        any:
22        - resources:
23            kinds:
24              - Pod
25      validate:
26        message: >-
27          Running as root is not allowed. The fields spec.securityContext.runAsUser,
28          spec.containers[*].securityContext.runAsUser, spec.initContainers[*].securityContext.runAsUser,
29          and spec.ephemeralContainers[*].securityContext.runAsUser must be unset or
30          set to a number greater than zero.          
31        pattern:
32          spec:
33            =(securityContext):
34              =(runAsUser): ">0"
35            =(ephemeralContainers):
36            - =(securityContext):
37                =(runAsUser): ">0"
38            =(initContainers):
39            - =(securityContext):
40                =(runAsUser): ">0"
41            containers:
42            - =(securityContext):
43                =(runAsUser): ">0"