# 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: projects-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: projects-sa
---
# Grant GCP role Project IAM Admin to GCP SA
apiVersion: iam.cnrm.cloud.google.com/v1beta1
kind: IAMPolicyMember
metadata:
  name: projects-sa-projectiamadmin-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:
  # AC-1, AC-3(7), AC-3, AC-16(2)
  resourceRef:
    apiVersion: resourcemanager.cnrm.cloud.google.com/v1beta1
    kind: Folder
    external: "123456789012" # kpt-set: ${lz-folder-id}
  role: roles/resourcemanager.projectIamAdmin
  member: "serviceAccount:projects-sa@management-project-id.iam.gserviceaccount.com" # kpt-set: serviceAccount:projects-sa@${management-project-id}.iam.gserviceaccount.com
---
# Grant GCP role Project Creator to GCP SA
apiVersion: iam.cnrm.cloud.google.com/v1beta1
kind: IAMPolicyMember
metadata:
  name: projects-sa-projectcreator-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:
  # AC-1, AC-3(7), AC-3, AC-16(2)
  resourceRef:
    apiVersion: resourcemanager.cnrm.cloud.google.com/v1beta1
    kind: Folder
    external: "123456789012" # kpt-set: ${lz-folder-id}
  role: roles/resourcemanager.projectCreator
  member: "serviceAccount:projects-sa@management-project-id.iam.gserviceaccount.com" # kpt-set: serviceAccount:projects-sa@${management-project-id}.iam.gserviceaccount.com
---
# Grant GCP role Project Mover to GCP SA
apiVersion: iam.cnrm.cloud.google.com/v1beta1
kind: IAMPolicyMember
metadata:
  name: projects-sa-projectmover-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:
  # AC-1, AC-3(7), AC-3, AC-16(2)
  resourceRef:
    apiVersion: resourcemanager.cnrm.cloud.google.com/v1beta1
    kind: Folder
    external: "123456789012" # kpt-set: ${lz-folder-id}
  role: roles/resourcemanager.projectMover
  member: "serviceAccount:projects-sa@management-project-id.iam.gserviceaccount.com" # kpt-set: serviceAccount:projects-sa@${management-project-id}.iam.gserviceaccount.com
---
# Grant GCP role Project Deleter to GCP SA
apiVersion: iam.cnrm.cloud.google.com/v1beta1
kind: IAMPolicyMember
metadata:
  name: projects-sa-projectdeleter-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:
  # AC-1, AC-3(7), AC-3, AC-16(2)
  resourceRef:
    apiVersion: resourcemanager.cnrm.cloud.google.com/v1beta1
    kind: Folder
    external: "123456789012" # kpt-set: ${lz-folder-id}
  role: roles/resourcemanager.projectDeleter
  member: "serviceAccount:projects-sa@management-project-id.iam.gserviceaccount.com" # kpt-set: serviceAccount:projects-sa@${management-project-id}.iam.gserviceaccount.com
---
# Grant GCP role Service Usage Admin to GCP SA
apiVersion: iam.cnrm.cloud.google.com/v1beta1
kind: IAMPolicyMember
metadata:
  name: projects-sa-serviceusageadmin-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:
  # AC-1, AC-3(7), AC-3, AC-16(2)
  resourceRef:
    apiVersion: resourcemanager.cnrm.cloud.google.com/v1beta1
    kind: Folder
    external: "123456789012" # kpt-set: ${lz-folder-id}
  role: roles/serviceusage.serviceUsageAdmin
  member: "serviceAccount:projects-sa@management-project-id.iam.gserviceaccount.com" # kpt-set: serviceAccount:projects-sa@${management-project-id}.iam.gserviceaccount.com
---
# Grant GCP role Billing User to GCP SA
# This role cannot be defined at a folder level. It can only be set at the org level.
apiVersion: iam.cnrm.cloud.google.com/v1beta1
kind: IAMPolicyMember
metadata:
  name: projects-sa-billinguser-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:
  # AC-1, AC-3(7), AC-3, AC-16(2)
  resourceRef:
    apiVersion: resourcemanager.cnrm.cloud.google.com/v1beta1
    kind: Organization
    external: "123456789012" # kpt-set: ${org-id}
  role: roles/billing.user
  member: "serviceAccount:projects-sa@management-project-id.iam.gserviceaccount.com" # kpt-set: serviceAccount:projects-sa@${management-project-id}.iam.gserviceaccount.com
---
# K8S SA
apiVersion: iam.cnrm.cloud.google.com/v1beta1
kind: IAMPartialPolicy
metadata:
  name: projects-sa-workload-identity-binding
  namespace: config-control # kpt-set: ${management-namespace}
  annotations:
    cnrm.cloud.google.com/project-id: management-project-id # kpt-set: ${management-project-id}
    cnrm.cloud.google.com/ignore-clusterless: "true"
spec:
  # AC-1, AC-3(7), AC-3, AC-16(2)
  resourceRef:
    name: projects-sa
    apiVersion: iam.cnrm.cloud.google.com/v1beta1
    kind: IAMServiceAccount
  bindings:
    - role: roles/iam.workloadIdentityUser
      members:
        - member: serviceAccount:management-project-id.svc.id.goog[cnrm-system/cnrm-controller-manager-projects] # kpt-set: serviceAccount:${management-project-id}.svc.id.goog[cnrm-system/cnrm-controller-manager-projects]
---
# 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: projects
  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: projects
  annotations:
    cnrm.cloud.google.com/ignore-clusterless: "true"
spec:
  # AC-3(7), AC-3, AC-16(2)
  googleServiceAccount: projects-sa@management-project-id.iam.gserviceaccount.com # kpt-set: projects-sa@${management-project-id}.iam.gserviceaccount.com
---
# Grant viewer role on the projects namespace to logging K8S SA
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: allow-projects-resource-reference-from-logging
  namespace: projects
  annotations:
    cnrm.cloud.google.com/ignore-clusterless: "true"
roleRef:
  # AC-1, AC-3(7), AC-3, AC-16(2)
  name: cnrm-viewer
  kind: ClusterRole
  apiGroup: rbac.authorization.k8s.io
subjects:
  - name: cnrm-controller-manager-logging
    namespace: cnrm-system
    kind: ServiceAccount
---
# Grant viewer role on the projects namespace to networking K8S SA
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: allow-projects-resource-reference-from-networking
  namespace: projects
  annotations:
    cnrm.cloud.google.com/ignore-clusterless: "true"
roleRef:
  # AC-1, AC-3(7), AC-3, AC-16(2)
  name: cnrm-viewer
  kind: ClusterRole
  apiGroup: rbac.authorization.k8s.io
subjects:
  - name: cnrm-controller-manager-networking
    namespace: cnrm-system
    kind: ServiceAccount
---
# Grant viewer role on the projects namespace to policies K8S SA
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: allow-projects-resource-reference-from-policies
  namespace: projects
  annotations:
    cnrm.cloud.google.com/ignore-clusterless: "true"
roleRef:
  # AC-1, AC-3(7), AC-3, AC-16(2)
  name: cnrm-viewer
  kind: ClusterRole
  apiGroup: rbac.authorization.k8s.io
subjects:
  - name: cnrm-controller-manager-policies
    namespace: cnrm-system
    kind: ServiceAccount
