solutions/core-landing-zone/namespaces/hierarchy.yaml

# Copyright 2021 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#########
# GCP SA
# AC-1 - Implementation of access control
# AC-3(7), AC-3, AC-16(2) - This service account possesses limited privileges(permissions) and is restricted to performing only the necessary operations for resources within the designated namespace. The service account is associated with the namespace and is assigned roles as required.
apiVersion: iam.cnrm.cloud.google.com/v1beta1
kind: IAMServiceAccount
metadata:
  name: hierarchy-sa
  namespace: config-control # kpt-set: ${management-namespace}
  annotations:
    cnrm.cloud.google.com/project-id: management-project-id # kpt-set: ${management-project-id}
    cnrm.cloud.google.com/ignore-clusterless: "true"
spec:
  # AC-3(7), AC-3, AC-16(2)
  displayName: hierarchy-sa
---
# Grant GCP role Folder Admin to GCP SA
apiVersion: iam.cnrm.cloud.google.com/v1beta1
kind: IAMPolicyMember
metadata:
  name: hierarchy-sa-folderadmin-permissions
  namespace: config-control # kpt-set: ${management-namespace}
  annotations:
    cnrm.cloud.google.com/project-id: management-project-id # kpt-set: ${management-project-id}
    cnrm.cloud.google.com/ignore-clusterless: "true"
spec:
  resourceRef:
    apiVersion: resourcemanager.cnrm.cloud.google.com/v1beta1
    kind: Folder
    external: "123456789012" # kpt-set: ${lz-folder-id}
  # AC-1, AC-3(7), AC-3, AC-16(2)
  role: roles/resourcemanager.folderAdmin
  member: "serviceAccount:hierarchy-sa@management-project-id.iam.gserviceaccount.com" # kpt-set: serviceAccount:hierarchy-sa@${management-project-id}.iam.gserviceaccount.com
---
apiVersion: iam.cnrm.cloud.google.com/v1beta1
kind: IAMPartialPolicy
metadata:
  name: hierarchy-sa-workload-identity-binding
  namespace: config-control # kpt-set: ${management-namespace}
  annotations:
    cnrm.cloud.google.com/project-id: management-project-id # kpt-set: ${management-project-id}
    cnrm.cloud.google.com/ignore-clusterless: "true"
spec:
  resourceRef:
    name: hierarchy-sa
    apiVersion: iam.cnrm.cloud.google.com/v1beta1
    kind: IAMServiceAccount
  # AC-1, AC-3(7), AC-3, AC-16(2)
  bindings:
    - role: roles/iam.workloadIdentityUser
      members:
        - member: serviceAccount:management-project-id.svc.id.goog[cnrm-system/cnrm-controller-manager-hierarchy] # kpt-set: serviceAccount:${management-project-id}.svc.id.goog[cnrm-system/cnrm-controller-manager-hierarchy]
---
# Namespace created to segregate resources. Each Namespace will be given a specific Kubernetes Service account and GCP Service Account
apiVersion: v1
kind: Namespace
metadata:
  name: hierarchy
  annotations:
    cnrm.cloud.google.com/ignore-clusterless: "true"
---
# Link GCP SA to K8S namespace
apiVersion: core.cnrm.cloud.google.com/v1beta1
kind: ConfigConnectorContext
metadata:
  name: configconnectorcontext.core.cnrm.cloud.google.com
  namespace: hierarchy
  annotations:
    cnrm.cloud.google.com/ignore-clusterless: "true"
# AC-3(7), AC-3, AC-16(2)
spec:
  googleServiceAccount: hierarchy-sa@management-project-id.iam.gserviceaccount.com # kpt-set: hierarchy-sa@${management-project-id}.iam.gserviceaccount.com
---
# Grant viewer role on the hierarchy namespace to projects K8S SA
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: allow-hierarchy-resource-reference-from-projects
  namespace: hierarchy
  annotations:
    cnrm.cloud.google.com/ignore-clusterless: "true"
# AC-1, AC-3(7), AC-3, AC-16(2)
roleRef:
  name: cnrm-viewer
  kind: ClusterRole
  apiGroup: rbac.authorization.k8s.io
subjects:
  - name: cnrm-controller-manager-projects
    namespace: cnrm-system
    kind: ServiceAccount
---
# Grant viewer role on the hierarchy namespace to policies K8S SA
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: allow-hierarchy-resource-reference-from-policies
  namespace: hierarchy
  annotations:
    cnrm.cloud.google.com/ignore-clusterless: "true"
# AC-1, AC-3(7), AC-3, AC-16(2)
roleRef:
  name: cnrm-viewer
  kind: ClusterRole
  apiGroup: rbac.authorization.k8s.io
subjects:
  - name: cnrm-controller-manager-policies
    namespace: cnrm-system
    kind: ServiceAccount
---
# IAM Permissions to create folder sinks
# Grant viewer role on the hierarchy namespace to config-control K8S SA
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: allow-hierarchy-resource-reference-from-config-control
  namespace: hierarchy
  annotations:
    cnrm.cloud.google.com/ignore-clusterless: "true"
# AC-1, AC-3(7), AC-3, AC-16(2)
roleRef:
  name: cnrm-viewer
  kind: ClusterRole
  apiGroup: rbac.authorization.k8s.io
subjects:
  - name: cnrm-controller-manager-config-control
    namespace: cnrm-system
    kind: ServiceAccount
---
# Grant viewer role on the hierarchy namespace to logging K8S SA
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: allow-folders-resource-reference-to-logging
  namespace: hierarchy
  annotations:
    cnrm.cloud.google.com/ignore-clusterless: "true"
# AC-1, AC-3(7), AC-3, AC-16(2)
roleRef:
  name: cnrm-viewer
  kind: ClusterRole
  apiGroup: rbac.authorization.k8s.io
subjects:
  - name: cnrm-controller-manager-logging
    namespace: cnrm-system
    kind: ServiceAccount