Habilita IAP para GKE

En esta página, se explica cómo proteger una instancia de Google Kubernetes Engine (GKE) con Identity-Aware Proxy (IAP).

Descripción general

IAP está integrado a través de Ingress para GKE. Esta integración te permite controlar el nivel de acceso de los empleados en lugar de usar una VPN.

En el clúster de GKE, el tráfico entrante es controlado por el balanceo de cargas de HTTP(S), un componente de Cloud Load Balancing. Por lo general, el balanceador de cargas de HTTP(S) está configurado por el controlador de Ingress de Kubernetes. El controlador de Ingress recibe información sobre la configuración de un objeto Ingress de Kubernetes, que está vinculado con uno o más objetos de Servicio. Cada objeto de servicio contiene información de enrutamiento que se usa para direccionar una solicitud entrante a un pod o puerto específico.

A partir de la versión Kubernetes 1.10.5-gke.3, tienes la posibilidad de agregar configuraciones al balanceador de cargas mediante la asociación de un servicio con un objeto de BackendConfig. BackendConfig es una definición personalizada de recurso (CRD) que está definida en el repositorio kubernetes/ingress-gce.

El controlador de ingreso de Kubernetes lee los datos de configuración provenientes de BackendConfig y configura el balanceador de cargas según corresponda. BackendConfig contiene datos de configuración específicos de Cloud Load Balancing y permite definir una configuración aparte para cada servicio de backend de balanceo de cargas de HTTP(S).

Antes de comenzar

Con el fin de habilitar IAP para GKE, necesitas lo siguiente:

• Un proyecto de la consola de Google Cloud con facturación habilitada
• Un grupo de una o más instancias de GKE entregadas mediante un balanceador de cargas de HTTPS. El balanceador de cargas debería crearse de forma automática cuando generas un objeto Ingress en un clúster de GKE
  • Aprende cómo crear un Ingress para HTTPS
• Un nombre de dominio registrado con la dirección de tu balanceador de cargas
• Un código de la app para verificar que todas las solicitudes tengan una identidad
  • Aprender cómo obtener la identidad del usuario

Habilita IAP

If you haven't configured your project's OAuth consent screen, you'll be prompted to do so. To configure your OAuth consent screen, see Setting up your OAuth consent screen.

Setting up IAP access

1. Go to the Identity-Aware Proxy page.
   Go to the Identity-Aware Proxy page
2. Select the project you want to secure with IAP.

3. Select the checkbox next to the resource you want to grant access to.

   If you don't see a resource, ensure that the resource is created and that the BackendConfig Compute Engine ingress controller is synced.

   To verify that the backend service is available, run the following gcloud command:

   gcloud compute backend-services list
4. On the right side panel, click Add principal.
5. In the Add principals dialog that appears, enter the email addresses of groups or individuals who should have the IAP-secured Web App User role for the project.

   The following kinds of principals can have this role:

   • Google Account: [e-mail]
   • Google Group: [e-mail]
   • Service account: [e-mail]
   • Google Workspace domain: example.com

   Make sure to add a Google Account that you have access to.

6. Select Cloud IAP > IAP-secured Web App User from the Roles drop-down list.
7. Click Save.

Configuring BackendConfig

To configure BackendConfig for IAP, create a Kubernetes Secret and then add an iap block to the BackendConfig.

Creating a Kubernetes Secret

The BackendConfig uses a Kubernetes Secret to wrap the OAuth client you created earlier. Kubernetes Secrets are managed like other Kubernetes objects by using the kubectl command-line interface (CLI). To create a Secret, run the following command where client_id_key and client_secret_key are the keys from the JSON file you downloaded when you created OAuth credentials:

kubectl create secret generic my-secret --from-literal=client_id=client_id_key \
    --from-literal=client_secret=client_secret_key

The preceding command displays output to confirm when the Secret is successfully created:

secret "my-secret" created

Adding an iap block to the BackendConfig

To configure the BackendConfig for IAP, you need to specify the enabled and secretName values. To specify these values, ensure that you have the compute.backendServices.update permission and add the iap block to BackendConfig. In this block, my-secret is the Kubernetes Secret name you created previously:

Note: You can't enable both IAP and Cloud CDN (Cloud CDN) in a BackendConfig. If the BackendConfig doesn't have a IAP block, then any existing IAP settings on the backend service are inherited.

For GKE versions 1.16.8-gke.3 and higher, use the `cloud.google.com/v1` API version. If you are using an earlier GKE version, use `cloud.google.com/v1beta1`.

apiVersion: cloud.google.com/v1
kind: BackendConfig
metadata:
  name: config-default
  namespace: my-namespace
spec:
  iap:
    enabled: true
    oauthclientCredentials:
      secretName: my-secret

You also need to associate Service ports with your BackendConfig to trigger turning on IAP. One way to make this association is to make all ports for the service default to your BackendConfig, which you can do by adding the following annotation to your Service resource:

metadata:
  annotations:
    beta.cloud.google.com/backend-config: '{"default": "config-default"}'

To test the configuration, run kubectl get event. If you see the message "no BackendConfig for service port exists", then you successfully associated a service port with your BackendConfig, but the BackendConfig resource wasn't found. This error can occur if you haven't created the BackendConfig resource, created it in the wrong namespace, or misspelled the reference in the Service annotation.

Note: IAP adds the gcp-iap-mode=AUTHENTICATING query parameter to the redirected request that occurs after OAuth authentication, so be sure to check your ingress load balancer's routing configuration to ensure that redirected requests are going to the correct backend service after a user authenticates through OAuth.

If the secretName you referenced doesn't exist or isn't structured properly, one of the following error messages will display:

• BackendConfig default/config-default is not valid: error retrieving secret "foo": secrets "foo" not found. To resolve this error, make sure that you've created the Kubernetes Secret correctly as described in the previous section.
• BackendConfig default/config-default is not valid: secret "foo" missing client_secret data. To resolve this error, make sure that you've created the OAuth credentials correctly. Also, make sure that you referenced the correct client_id and client_secret keys in the JSON you downloaded previously.

When the enabled flag is set to true and the secretName is correctly set, IAP is configured for your selected resource.

Note: You might get an `Add firewall rule` warning message on the IAP configuration page for network endpoint group (NEG) based backends even though the correct firewall rule exists. The firewall rule warning is informational and can be safely ignored.

Turning IAP off

To turn IAP off, you must set enabled to false in the BackendConfig. If you delete the IAP block from BackendConfig, the settings will persist. For example, if IAP is enabled with secretName: my_secret and you delete the block, then IAP will still be turned on with the OAuth credentials stored in my_secret.

¿Qué sigue?

• Más información sobre cómo configurar Cloud CDN en GKE
• Más información sobre cómo configurar Cloud Armor para GKE
• Más información acerca del recurso de BackendConfig