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Overview

The multicluster-keycloak-operator is focused on providing a managed Single Sign-On (SSO) solution for a fleet of OpenShift clusters managed by Open Cluster Management.

The operator makes use of Keycloak to create a Github-backed identity provider.

  1. For each AuthorizationDomain, a KeycloakRealm will be created to provide an identity provider for the hub and managed clusters.
  2. For every ManagedCluster under management, a KeycloakClient will be created with a generated clientId and clientSecret.
  3. From there, a ManifestWork will be created that injects the clientSecret into a Secret on the ManagedCluster and updates the OAuth cluster configuration to respect the KeycloakRealm identity provider hosted on the Hub cluster.

Currently, a work-in-progress.

Getting Started

Deploy Red Hat Advanced Cluster Management for Kubernetes (RHACM)

  1. Deploy RHACM from the Operator Catalog on OpenShift Container Platform 4.7+.
  2. Create an empty MulticlusterHub to deploy the product API and web console.

Deploy the Red Hat Single Sign-On Operator (RHSSO)

If you already have RHACM deployed, you can configure the RH Single Sign-On Operator with the following Policy:

apiVersion: v1
kind: Namespace
metadata:
  name: open-cluster-management-policies
---
apiVersion: apps.open-cluster-management.io/v1
kind: Channel
metadata:
  name: example-policies-latest
  namespace: open-cluster-management-policies
spec:
  type: GitHub
  pathname: https://github.com/mdelder/open-cluster-management-examples.git
---
apiVersion: apps.open-cluster-management.io/v1
kind: Subscription
metadata:
  annotations:
    apps.open-cluster-management.io/github-path: policies
  name: example-policies
  namespace: open-cluster-management-policies
  labels:
    app: example-policies
spec:
  channel: open-cluster-management-policies/example-policies-latest
  placement:
    local: true
  packageOverrides:
  - packageName: kustomization
    packageOverrides:
    - value:
        generatorOptions:
          disableNameSuffixHash: true
        resources:
          - dev-clusters-placementrule.yaml
          - production-clusters-placementrule.yaml
          - policy-group-demo-admins.yaml
          - policy-rhsso-operator.yaml

Otherwise you can manually deploy the RHSSO operator. If you are running on OpenShift 4.7, you must patch additional Roles/Bindings in place to work around a current bug on RHSSO 7.4.6.

  1. Install the Red Hat Single Sign-On Operator from the OpenShift Operator Catalog.
apiVersion: operators.coreos.com/v1alpha1
kind: Subscription
metadata:
  labels:
    operators.coreos.com/rhsso-operator.keycloak: ""
  name: rhsso-operator
  namespace: keycloak
spec:
  channel: alpha
  installPlanApproval: Automatic
  name: rhsso-operator
  source: redhat-operators
  sourceNamespace: openshift-marketplace
  startingCSV: rhsso-operator.7.4.4
  1. Configure a running instance of Keycloak, the service that is managed by the Red Hat SSO Operator.
apiVersion: keycloak.org/v1alpha1
kind: Keycloak
metadata:
  name: keycloak-sso
  labels:
    app: sso
  namespace: keycloak
spec:
  externalAccess:
    enabled: true
  instances: 1
  1. Patch the permissions to allow the RHSSO operator the ability to update the Route on OpenShift Container Platform 4.7:
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: rhsso-operator-route-editor
  namespace: keycloak
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: route-editor
subjects:
- kind: ServiceAccount
  name: rhsso-operator
  namespace: keycloak
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: route-editor
rules:
- apiGroups:
  - route.openshift.io
  resources:
  - routes/custom-host
  verbs:
  - create
  - update
  - list
  - get
  - patch

Deploy the Multicluster Keycloak Operator into your cluster.

export KUBECONFIG=./path/to/your/kubeconfig
make install
make deploy

Configure an AuthorizationDomain with your GitHub OAuth App

At this point, you can configure the AuthorizationDomain object that will reference your GitHub OAuthApp and inject configuration to each ManagedCluster to use the Red Hat Single Sign-On (SSO) operator that you configured above.

  1. Register an OAuth App on GitHub (see the GitHub docs).
    • Use any value for the homepageURL.
    • Use https://keycloak-keycloak.apps.<clusterName>.<baseDomain>/auth/realms/sso-ad/broker/github/endpoint for the OAuthCallbackURL. The Route will be served by the instance of Keycloak deployed in step 3. The segment "sso-ad" is MUST be used as the name of the AuthorizationDomain created below. So if you create an AuthorizationDomain of a different name, then replace "sso-ad" in this URL with the name that you used for the AuthorizationDomain.
    • Retrieve the clientID and clientSecret.
  1. Create a Secret in the Namespace keycloak to store the GitHub OAuth clientID and clientSecret.
apiVersion: v1
kind: Secret
stringData:
  clientId: ...
  clientSecret: ...
metadata:
  name: github-oauth-credentials
  namespace: keycloak
type: Opaque
  1. Create an AuthorizationDomain. The Multicluster Keycloak Operator (in this project) will reconcile the AuthorizationDomain CR and create the necessary Keycloak resources to allow any ManagedCluster to use the running Keycloak service on the Hub as an OAuth2 Identity Provider. In addition, every ManagedCluster will pick up a new ManifestWork that configures its local OAuth cluster CR.
apiVersion: keycloak.open-cluster-management.io/v1alpha1
kind: AuthorizationDomain
metadata:
  name: sso-ad
  namespace: keycloak
spec:
  identityProviders:
  - type: github
    secretRef: github-oauth-credentials
# These fields are optional and are now discovered if not provided
#  issuerURL: "https://keycloak-keycloak.apps.<clusterName>.<baseDomain>/auth/realms/sso-ad"
#  issuerCertificate:
#    configMapRef: ca-config-map

NOTE: This project remains a work in progress and the various objects that are created may need to be removed manually if you delete the AuthorizationDomain. Be sure to have access to the TLS certificates or an alternative way to login to your cluster in case a problem occurs.

Using Open Cluster Management policies to preconfigure RBAC on ManagedClusters.

The following two policies will allow you to precreate a Group backed by email addresses that will be retrieve from GitHub to create the relevant Identity and User object after a user accesses a ManagedCluster console.

apiVersion: policy.open-cluster-management.io/v1
kind: Policy
metadata:
  name: policy-group-demo-admins
  namespace: open-cluster-management-policies
  annotations:
    policy.open-cluster-management.io/standards: NIST-CSF
    policy.open-cluster-management.io/categories: PR.AC Identity Management Authentication and Access Control
    policy.open-cluster-management.io/controls: PR.AC-4 Access Control
spec:
  remediationAction: enforce
  disabled: false
  policy-templates:
    - objectDefinition:
        apiVersion: policy.open-cluster-management.io/v1
        kind: ConfigurationPolicy
        metadata:
          name: demo-admins-group-config-policy
        spec:
          severity: high
          object-templates:
            - complianceType: mustonlyhave
              objectDefinition:
                apiVersion: user.openshift.io/v1
                kind: Group
                metadata:
                  name: demo-admins
                users:
                - UPDATE THIS LIST WITH EMAIL ADDRESSES OF YOUR GITHUB USERS
    - objectDefinition:
        apiVersion: policy.open-cluster-management.io/v1
        kind: ConfigurationPolicy
        metadata:
          name: demo-admins-clusterrolebinding-config-policy
        spec:
          severity: high
          object-templates:
            - complianceType: mustonlyhave # role definition should exact match
              objectDefinition:
                apiVersion: rbac.authorization.k8s.io/v1
                kind: ClusterRoleBinding
                metadata:
                  name: demo-admins
                roleRef:
                  apiGroup: rbac.authorization.k8s.io
                  kind: ClusterRole
                  name: cluster-admin
                subjects:
                - apiGroup: rbac.authorization.k8s.io
                  kind: Group
                  name: demo-admins
---
apiVersion: policy.open-cluster-management.io/v1
kind: PlacementBinding
metadata:
  name: binding-policy-group-demo-admins
  namespace: open-cluster-management-policies
placementRef:
  name: placement-policy-group-demo-admins
  kind: PlacementRule
  apiGroup: apps.open-cluster-management.io
subjects:
- name: policy-group-demo-admins
  kind: Policy
  apiGroup: policy.open-cluster-management.io
---
apiVersion: apps.open-cluster-management.io/v1
kind: PlacementRule
metadata:
  name: placement-policy-group-demo-admins
  namespace: open-cluster-management-policies
spec:
  clusterConditions:
  - status: "True"
    type: ManagedClusterConditionAvailable
  clusterSelector:
    matchExpressions: []

The following policy will remove the default kubeadmin credential from all ManagedClusters.

apiVersion: policy.open-cluster-management.io/v1
kind: Policy
metadata:
  name: no-kubeadmin-config-policy
  namespace: open-cluster-management-policies
  annotations:
    policy.open-cluster-management.io/standards: NIST-CSF
    policy.open-cluster-management.io/categories: PR.AC Identity Management Authentication and Access Control
    policy.open-cluster-management.io/controls: PR.AC-4 Access Control
spec:
  remediationAction: enforce
  disabled: false
  policy-templates:
    - objectDefinition:
        apiVersion: policy.open-cluster-management.io/v1
        kind: ConfigurationPolicy
        metadata:
          name: no-kubeadmin-config-policy
        spec:
          severity: high
          object-templates:
            - complianceType: mustnothave
              objectDefinition:
                apiVersion: v1
                kind: Secret
                metadata:
                  name: kubeadmin
                  namespace: kube-system
                type: Opaque
---
apiVersion: policy.open-cluster-management.io/v1
kind: PlacementBinding
metadata:
  name: binding-no-kubeadmin-config-policy
  namespace: open-cluster-management-policies
placementRef:
  name: placement-no-kubeadmin-config-policy
  kind: PlacementRule
  apiGroup: apps.open-cluster-management.io
subjects:
- name: no-kubeadmin-config-policy
  kind: Policy
  apiGroup: policy.open-cluster-management.io
---
apiVersion: apps.open-cluster-management.io/v1
kind: PlacementRule
metadata:
  name: placement-no-kubeadmin-config-policy
  namespace: open-cluster-management-policies
spec:
  clusterConditions:
  - status: "True"
    type: ManagedClusterConditionAvailable
  clusterSelector:
    matchExpressions: []

Project assembly

The initial project was created following the Operator SDK Tutorial for Golang.

operator-sdk init operator-sdk init --domain=open-cluster-management.io
operator-sdk create api --group=keycloak --version=v1alpha1 --kind=AuthorizationDomain
go mod vendor

make generate
make manifests

Developing/Contributing

Contributions are welcome and encouraged via Pull Requests.

make generate
make manifests
make install
make run

References

Operator SDK Advanced Topics