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RBAC Permissions Operator

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Summary

The RBAC-Permissions-Operator was created for the Openshift Dedicated platform to manage various permissions (via k8s RBAC policies) to all the projects/namespaces within an OpenShift Dedicated cluster. The permissions must allow for cluster and namespace scope access and the ability to safe list and/or blocklist namespaces.

It contains the following components:

  • Namespace controller: watches for new namespaces and guarantees that the proper RoleBindings are assigned to them.
  • SubjectPermission controller: watches for subject permission changes and creates ClusterRoleBindings and RoleBindings as needed.

To avoid giving admin permissions to specific namespaces (eg. infra/cluster-admin related), two regex are implemented in the form of NamespacesAllowedRegex and NamespacesDeniedRegex. These will help us determine which namespaces should get the RoleBinding assignment.

Metrics

Testing, Locally (CRC)

To test a new version of the operator locally using CRC you need to:

  1. start CRC
  2. run make predeploy
  3. on a separate terminal run make deploy-local
  4. apply any valid CR and watch for log changes

Controllers

Namespace Controller

Watch for the creation of new Namespaces that passes through NamespacesAllowedRegex and NamespacesDeniedRegex. When discovered create RoleBindings in that namespace to the corresponding subject.

SubjectPermission Controller

The subjectpermission-controller is triggered by a new SubjectPermission CR or a change to an existing SubjectPermission CR. It is responsible for the creation of ClusterRoleBinding and Rolebinding. It looks at the subjectName and the clusterRoleName passed in by the SubjectPermission CR. If corresponding ClusterRoleBinding and/or RoleBinding do not exist then create them.

Custom Resources

SubjectPermission CR

The SubjectPermission CR holds the SubjectKind, SubjectName, clusterPermissions, and permissions needed to configure the rbac policies needed for any given subject. All configurations can be found at managed-cluster-config

apiVersion: managed.openshift.io/v1alpha1
kind: SubjectPermission
metadata:
  name: dedicated-admins
  namespace: openshift-rbac-permissions
spec:
  subjectKind: Group
  subjectName: dedicated-admins
  clusterPermissions:
    - dedicated-admins-cluster
  permissions:
    -
      clusterRoleName: dedicated-admins-project
      namespacesAllowedRegex: ".*"
      namespacesDeniedRegex: "(^kube-.*|^openshift.*|^ops-health-monitoring$|^management-infra$|^default$|^logging$|^sre-app-check$)"
    -
      clusterRoleName: admin
      namespacesAllowedRegex: ".*"
      namespacesDeniedRegex: "(^kube-.*|^openshift.*|^ops-health-monitoring$|^management-infra$|^default$|^logging$|^sre-app-check$)"