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Configuring SSO for Argo CD using Keycloak

After the Red Hat OpenShift GitOps Operator is installed, Argo CD automatically creates a user with admin permissions. To manage multiple users, cluster administrators can use Argo CD to configure Single Sign-On (SSO).

Prerequisites

  • Red Hat SSO is installed on the cluster.

  • The Red Hat OpenShift GitOps Operator is installed on your OpenShift Container Platform cluster.

  • Argo CD is installed on the cluster.

  • The DeploymentConfig API is available in the cluster. For more information, see "DeploymentConfig [apps.openshift.io/v1]".

Configuring a new client in Keycloak

Dex is installed by default for all the Argo CD instances created by the Operator. However, you can delete the Dex configuration and add Keycloak instead to log in to Argo CD using your OpenShift credentials. Keycloak acts as an identity broker between Argo CD and OpenShift.

Procedure

To configure Keycloak, follow these steps:

  1. Delete the Dex configuration by removing the .spec.sso.dex parameter from the Argo CD custom resource (CR), and save the CR:

    dex:
    openShiftOAuth: true
    resources:
      limits:
        cpu:
        memory:
      requests:
        cpu:
        memory:

  2. Set the value of the provider parameter to keycloak in the Argo CD CR.

  3. Configure Keycloak by performing one of the following steps:

    • For a secure connection, set the value of the rootCA parameter as shown in the following example:

      apiVersion: argoproj.io/v1beta1
kind: ArgoCD
metadata:
  name: example-argocd
  labels:
    example: basic
spec:
  sso:
    provider: keycloak
    keycloak:
      rootCA: "<PEM-encoded-root-certificate>" (1)
  server:
    route:
      enabled: true
      1 A custom certificate used to verify the Keycloak’s TLS certificate.

      The Operator reconciles changes in the .spec.sso.keycloak.rootCA parameter and updates the oidc.config parameter with the PEM encoded root certificate in the argocd-cm configuration map.

    • For an insecure connection, leave the value of the rootCA parameter empty and use the oidc.tls.insecure.skip.verify parameter as shown below:

      apiVersion: argoproj.io/v1beta1
kind: ArgoCD
metadata:
  name: example-argocd
  labels:
    example: basic
spec:
  extraConfig:
    oidc.tls.insecure.skip.verify: "true"
  sso:
    provider: keycloak
    keycloak:
      rootCA: ""

    • Optional: Customize the spec.sso.keycloak field to add the route name for the keycloak provider in the ArgoCD CR. Use this feature to support advanced routing use cases, such as balancing incoming traffic load among multiple Ingress Controller sharding.

      • Add a host parameter in the ArgoCD CR by using the following example YAML:

        Example ArgoCD CR
        apiVersion: argoproj.io/v1alpha1
kind: ArgoCD
metadata:
  name: <resource_name> (1)
  labels:
    example: route
spec:
  sso:
    provider: keycloak
    keycloak:
     host: <hostname> (2)
  server:
    ingress:
      enabled: true
    insecure: true
        1 Replace <resource_name> with the name of the ArgoCD CR.
        2 Replace <hostname> with the name of the host key, for example, sso.test.example.com.

      • To create the ArgoCD CR, run the following command:

        $ oc create -f <argocd_filename>.yaml -n <your-namespace>

      • To edit the ArgoCD CR, run the following command:

        $ oc edit -f <argocd_filename>.yaml -n <your_namespace>

      • Save the file to apply the changes.

      • To apply the ArgoCD CR, run the following command:

        $ oc apply -f <argocd_filename>.yaml -n <your_namespace>

      • Verify that the host attribute is added by running the following command:

        $ oc get route keycloak -n <your_namespace> -o yaml
        Example output
        kind: Route
metadata:
  name: keycloak (1)
  labels:
    application: keycloak
spec:
  host: sso.test.example.com
status:
  ingress:
    - host: sso.test.example.com (2)
        1 Specifies the name of the route.
        2 Specifies the name of the host key.

        The Keycloak instance takes 2-3 minutes to install and run.

Logging in to Keycloak

Log in to the Keycloak console to manage identities or roles and define the permissions assigned to the various roles.

Prerequisites

  • The default configuration of Dex is removed.

  • Your Argo CD CR must be configured to use the Keycloak SSO provider.

Procedure

  1. Get the Keycloak route URL for login:

    $ oc -n argocd get route keycloak

NAME        HOST/PORT                                                        PATH   SERVICES   PORT    TERMINATION   WILDCARD
keycloak    keycloak-default.apps.ci-ln-******.origin-ci-int-aws.dev.**.com         keycloak   <all>    reencrypt     None

  2. Get the Keycloak pod name that stores the user name and password as environment variables:

    $ oc -n argocd get pods

NAME                      READY   STATUS           RESTARTS   AGE
keycloak-1-2sjcl           1/1    Running            0        45m

    1. Get the Keycloak user name:

      $ oc -n argocd exec keycloak-1-2sjcl -- "env" | grep SSO_ADMIN_USERNAME

SSO_ADMIN_USERNAME=Cqid54Ih

    2. Get the Keycloak password:

      $ oc -n argocd exec keycloak-1-2sjcl -- "env" | grep SSO_ADMIN_PASSWORD

SSO_ADMIN_PASSWORD=GVXxHifH

  3. On the login page, click LOG IN VIA KEYCLOAK.

    You only see the option LOGIN VIA KEYCLOAK after the Keycloak instance is ready.

  4. Click Login with OpenShift.

    Login using kubeadmin is not supported.

  5. Enter the OpenShift credentials to log in.

  6. Optional: By default, any user logged in to Argo CD has read-only access. You can manage the user level access by updating the argocd-rbac-cm config map:

    policy.csv:
<name>, <email>, role:admin

Uninstalling Keycloak

You can delete the Keycloak resources and their relevant configurations by removing the SSO field from the Argo CD Custom Resource (CR) file. After you remove the SSO field, the values in the file look similar to the following:

  apiVersion: argoproj.io/v1beta1
  kind: ArgoCD
  metadata:
    name: example-argocd
    labels:
      example: basic
  spec:
    server:
      route:
       enabled: true

A Keycloak application created by using this method is currently not persistent. Additional configurations created in the Argo CD Keycloak realm are deleted when the server restarts.

Modifying Keycloak resource requests/limits

By default, the Keycloak container is created with resource requests and limitations. You can change and manage the resource requests.

Resource Requests Limits

CPU

500

1000m

Memory

512 Mi

1024 Mi
Procedure

  • Modify the default resource requirements patching the Argo CD custom resource (CR):

$ oc -n openshift-gitops patch argocd openshift-gitops --type='json' -p='[{"op": "add", "path": "/spec/sso", "value": {"provider": "keycloak", "resources": {"requests": {"cpu": "512m", "memory": "512Mi"}, "limits": {"cpu": "1024m", "memory": "1024Mi"}} }}]'

Keycloak created by the Red Hat OpenShift GitOps only persists the changes that are made by the operator. If the Keycloak restarts, any additional configuration created by the Admin in Keycloak is deleted.