Generate Flux Multi-Tenant Resources

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: generate-flux-multi-tenant-resources
 5  annotations:
 6    policies.kyverno.io/title: Generate Flux Multi-Tenant Resources
 7    policies.kyverno.io/category: Flux
 8    kyverno.io/kyverno-version: 1.6.2
 9    policies.kyverno.io/minversion: 1.6.0
10    kyverno.io/kubernetes-version: "1.23"
11    policies.kyverno.io/subject: ServiceAccount, RoleBinding
12    policies.kyverno.io/description: >-
13      As part of the tenant provisioning process, Flux needs to generate RBAC resources. This policy
14      will create a ServiceAccount and RoleBinding when a new or existing Namespace is labeled
15      with `toolkit.fluxcd.io/tenant`. Use of this rule may require an additional binding for the
16      Kyverno ServiceAccount so it has permissions to properly create the RoleBinding.      
17spec:
18  rules:
19  - name: generate-flux-sa
20    match:
21      any:
22      - resources:
23          kinds:
24          - Namespace
25          selector:
26            matchLabels:
27              toolkit.fluxcd.io/tenant: "?*"
28    generate:
29      apiVersion: v1
30      kind: ServiceAccount
31      name: "{{request.object.metadata.labels.\"toolkit.fluxcd.io/tenant\"}}"
32      namespace: "{{request.object.metadata.name}}"
33      synchronize: false
34      data:
35        metadata:
36          labels:
37            toolkit.fluxcd.io/tenant: "{{request.object.metadata.labels.\"toolkit.fluxcd.io/tenant\"}}"
38          name: "{{request.object.metadata.labels.\"toolkit.fluxcd.io/tenant\"}}"
39          namespace: "{{request.object.metadata.name}}"
40  - name: generate-flux-rolebinding
41    match:
42      any:
43      - resources:
44          kinds:
45          - Namespace
46          selector:
47            matchLabels:
48              toolkit.fluxcd.io/tenant: "?*"
49    generate:
50      apiVersion: rbac.authorization.k8s.io/v1
51      kind: RoleBinding
52      name: "{{request.object.metadata.labels.\"toolkit.fluxcd.io/tenant\"}}"
53      namespace: "{{request.object.metadata.name}}"
54      synchronize: false
55      data:
56        metadata:
57          labels:
58            toolkit.fluxcd.io/tenant: "{{request.object.metadata.labels.\"toolkit.fluxcd.io/tenant\"}}"
59          name: "flux-{{request.object.metadata.labels.\"toolkit.fluxcd.io/tenant\"}}"
60          namespace: "{{request.object.metadata.name}}"
61        roleRef:
62          apiGroup: rbac.authorization.k8s.io
63          kind: ClusterRole
64          name: cluster-admin
65        subjects:
66        - kind: User
67          name: "flux:{{request.object.metadata.name}}:{{request.object.metadata.labels.\"toolkit.fluxcd.io/tenant\"}}"
68        - kind: ServiceAccount
69          name: "{{request.object.metadata.labels.\"toolkit.fluxcd.io/tenant\"}}"
70          namespace: "{{request.object.metadata.name}}"