Require securityContext for Tekton TaskRun

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: require-tekton-securitycontext
 5  annotations:
 6    policies.kyverno.io/title: Require securityContext for Tekton TaskRun
 7    policies.kyverno.io/category: Tekton
 8    policies.kyverno.io/severity: medium
 9    policies.kyverno.io/subject: TaskRun
10    kyverno.io/kyverno-version: 1.7.2
11    policies.kyverno.io/minversion: 1.7.0
12    kyverno.io/kubernetes-version: "1.23"
13    policies.kyverno.io/description: >- 
14      A securityContext is required for each TaskRun step.
15spec:
16  validationFailureAction: Audit
17  background: true
18  rules:
19  - name: check-step-securitycontext
20    match:
21      any:
22      - resources:
23          kinds:
24          - tekton.dev/v1beta1/TaskRun.status
25    validate:
26      message: "A securityContext is required with `privileged` and `allowPrivilegeEscalation` set to `false`."
27      pattern:
28        =(status):
29          =(taskSpec):
30            steps:
31              # TODO: missing securityContext for digest-to-results
32              - (name): "!digest-to-results"
33                securityContext:
34                  # TODO: ideally all tasks run as non-root
35                  #runAsNonRoot: true
36                  privileged: false
37                  allowPrivilegeEscalation: false