Disallow Capabilities

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: disallow-capabilities
 5  annotations:
 6    policies.kyverno.io/title: Disallow Capabilities
 7    policies.kyverno.io/category: Pod Security Standards (Baseline)
 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: "1.22-1.23"
12    policies.kyverno.io/subject: Pod
13    policies.kyverno.io/description: >-
14            Adding capabilities beyond those listed in the policy must be disallowed.
15spec:
16  validationFailureAction: audit
17  background: true
18  rules:
19    - name: adding-capabilities
20      match:
21        any:
22        - resources:
23            kinds:
24              - Pod
25      validate:
26        message: >-
27          Any capabilities added beyond the allowed list (AUDIT_WRITE, CHOWN, DAC_OVERRIDE, FOWNER,
28          FSETID, KILL, MKNOD, NET_BIND_SERVICE, SETFCAP, SETGID, SETPCAP, SETUID, SYS_CHROOT)
29          are disallowed.          
30        deny:
31          conditions:
32            all:
33            - key: "{{ request.object.spec.[ephemeralContainers, initContainers, containers][].securityContext.capabilities.add[] }}"
34              operator: AnyNotIn
35              value:
36              - AUDIT_WRITE
37              - CHOWN
38              - DAC_OVERRIDE
39              - FOWNER
40              - FSETID
41              - KILL
42              - MKNOD
43              - NET_BIND_SERVICE
44              - SETFCAP
45              - SETGID
46              - SETPCAP
47              - SETUID
48              - SYS_CHROOT