Activer IAP pour Compute Engine

Cette page explique comment sécuriser une instance Compute Engine avec Identity-Aware Proxy (IAP).

Avant de commencer

Pour activer IAP pour Compute Engine, vous devez disposer des éléments suivants :

Si votre instance Compute Engine n'est pas déjà configurée, consultez la page Configurer IAP pour Compute Engine pour obtenir une présentation complète.

IAP utilise un client OAuth géré par Google pour authentifier les utilisateurs. Seuls les utilisateurs de l'organisation peuvent accéder à l'application compatible avec les achats intégrés. Si vous souhaitez autoriser l'accès à des utilisateurs externes à votre organisation, consultez la section Activer IAP pour les applications externes.

Vous pouvez activer l'IAP sur un service backend Compute Engine ou sur une règle de transfert Compute Engine. Lorsque vous activez l'IAP sur un service de backend Compute Engine, seul ce service de backend est protégé par l'IAP. Lorsque vous activez IAP sur une règle de transfert Compute Engine, toutes les instances Compute Engine derrière la règle de transfert sont protégées par IAP.

Activer l'IAP sur une règle de transfert

Vous pouvez activer l'API Access Policy sur une règle de transfert à l'aide du framework de règles d'autorisation de l'équilibreur de charge.

gcloud

  1. Run the following command to prepare a policy.yaml file. The policy allows clients with an IP address range of 10.0.0.0/24 to enable IAP on a forwarding rule.
$ cat << EOF > policy.yaml
action: CUSTOM
description: authz policy with Cloud IAP
name: AUTHZ_POLICY_NAME
httpRules:
  - from:
      sources:
      - ipBlocks:
        - prefix: "10.0.0.0"
          length: 24
customProvider:
  cloudIap: {}
target:
  loadBalancingScheme: EXTERNAL_MANAGED
  resources:
  - https://www.googleapis.com/compute/v1/projects/PROJECT_ID/regions/LOCATION/forwardingRules/FORWARDING_RULE_ID
EOF
  1. Run the following command to enable IAP on a forwarding rule.
gcloud network-security authz-policies import AUTHZ_POLICY_NAME \
--source=policy.yaml \
--location=LOCATION \
--project=PROJECT_ID

Replace the following:

  • PROJECT_ID: The Google Cloud project ID.
  • LOCATION: The region that the resource is located in.
  • FORWARDING_RULE_ID: The ID of the forwarding rule resource.
  • AUTHZ_POLICY_NAME: The name of the authorization policy.

API

  1. Run the following command to prepare a policy.json file. 
    cat << EOF > policy.json
{
"name": "AUTHZ_POLICY_NAME",
"target": {
  "loadBalancingScheme": "INTERNAL_MANAGED",
  "resources": [
    "https://www.googleapis.com/compute/v1/projects/PROJECT_ID/regions/LOCATION/forwardingRules/FORWARDING_RULE_ID"
  ],
},
"action": "CUSTOM",
"httpRules": [
  {
    "from": {
      "sources": {
        "ipBlocks": [
          {
            "prefix": "10.0.0.0",
            "length": 24
          }
        ]
      }
    }
  }
],
"customProvider": {
  "cloudIap": {}
}
}
EOF

  2. Run the following command to enable IAP on a forwarding rule. 

    curl -X PATCH \
-H "Authorization: Bearer $(gcloud auth print-access-token)" \
-H "Accept: application/json" \
-H "Content-Type: application/json" \
-d @policy.json \
"https://networksecurity.googleapis.com/v1/projects/PROJECT_ID/locations/LOCATION/authzPolicies"

    Replace the following:

    • PROJECT_ID: The Google Cloud project ID.
    • LOCATION: The region that the resource is located in.
    • FORWARDING_RULE_ID: The ID of the forwarding rule resource.
    • AUTHZ_POLICY_NAME: The name of the authorization policy.

Une fois que vous avez activé l'IAP sur une règle de transfert, vous pouvez appliquer des autorisations aux ressources.

Activer IAP sur un service de backend Compute Engine

Vous pouvez activer l'IAP sur un service de backend Compute Engine via ce service de backend.

Console

Le client OAuth géré par Google n'est pas disponible lorsque vous activez l'IAP à l'aide de la console Google Cloud .

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.

If you are running GKE clusters version 1.24 or later, you can configure IAP and GKE by using the Kubernetes Gateway API. To do so, complete the following steps and then follow the instructions in Configure IAP. Do not configure BackendConfig.

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: user@gmail.com
    • Google Group: admins@googlegroups.com
    • Service account: server@example.gserviceaccount.com
    • 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.

Turning on IAP

  1. On the Identity-Aware Proxy page, under APPLICATIONS, find the load balancer that serves the instance group you want to restrict access to. To turn on IAP for a resource,
    To enable IAP:
    • At least one protocol in the load balancer frontend configuration must be HTTPS. Learn about setting up a load balancer.
    • You need the compute.backendServices.update, clientauthconfig.clients.create, clientauthconfig.clients.update, and clientauthconfig.clients.getWithSecret permissions. These permissions are granted by roles, such as the Project Editor role. To learn more, see Managing access to IAP-secured resources.
  2. In the Turn on IAP window that appears, click Turn On to confirm that you want IAP to secure your resource. After you turn on IAP, it requires login credentials for all connections to your load balancer. Only accounts with the IAP-Secured Web App User role on the project will be given access.

gcloud

Before you set up your project and IAP, you need an up-to-date version of the gcloud CLI. For instructions on how to install the gcloud CLI, see Install the gcloud CLI.

  1. To authenticate, use the Google Cloud CLI and run the following command. 
    gcloud auth login
  2. To sign in, follow the URL that appears.
  3. After you sign in, copy the verification code that appears and paste it in the command line.
  4. Run the following command to specify the project that contains the resource that you want to protect with IAP. 
    gcloud config set project PROJECT_ID
  5. To enable IAP, run either the globally or regionally scoped command.

    Global scope 
    gcloud compute backend-services update BACKEND_SERVICE_NAME --global --iap=enabled
     Regional scope 
    gcloud compute backend-services update BACKEND_SERVICE_NAME --region REGION_NAME --iap=enabled

After you enable IAP, you can use the gcloud CLI to modify the IAP access policy using the IAM role roles/iap.httpsResourceAccessor. Learn more about managing roles and permissions.

API

  1. Run the following command to prepare a settings.json file. 

    cat << EOF > settings.json
{
"iap":
  {
    "enabled":true
  }
}
EOF

  2. Run the following command to enable IAP. 

    curl -X PATCH \
-H "Authorization: Bearer $(gcloud auth print-access-token)" \
-H "Accept: application/json" \
-H "Content-Type: application/json" \
-d @settings.json \
"https://compute.googleapis.com/compute/v1/projects/PROJECT_ID/REGION/backendServices/BACKEND_SERVICE_NAME"

After you enable IAP, you can use the Google Cloud CLI to modify the IAP access policy using the IAM role roles/iap.httpsResourceAccessor. Learn more about managing roles and permissions.