Check supplementalGroups

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: psp-check-supplemental-groups
 5  annotations:
 6    policies.kyverno.io/title: Check supplementalGroups
 7    policies.kyverno.io/category: PSP Migration
 8    policies.kyverno.io/severity: medium
 9    kyverno.io/kyverno-version: 1.6.0
10    policies.kyverno.io/minversion: 1.6.0
11    kyverno.io/kubernetes-version: "1.23"
12    policies.kyverno.io/subject: Pod
13    policies.kyverno.io/description: >-
14      Supplemental groups control which group IDs containers add and can coincide with
15      restricted groups on the host. Pod Security Policies (PSP) allowed a range of
16      these group IDs to be specified which were allowed. This policy ensures any Pod
17      may only specify supplementalGroup IDs between 100-200 or 500-600.      
18spec:
19  background: false
20  validationFailureAction: audit
21  rules:
22  - name: supplementalgroup-ranges
23    match:
24      any:
25      - resources:
26          kinds:
27            - Pod
28    preconditions:
29      all:
30      - key: "{{ request.operation || 'BACKGROUND' }}"
31        operator: AnyIn
32        value:
33        - CREATE
34        - UPDATE
35    validate:
36      message: Any supplementalGroup ID must be within the range 100-200 or 500-600.
37      pattern:
38        spec:
39          =(securityContext):
40            =(supplementalGroups): 100-200 | 500-600