Compute Engine の IAP の有効化

このページでは、Identity-Aware Proxy（IAP） で Compute Engine インスタンスを保護する方法について説明します。

始める前に

Compute Engine で IAP を有効にするには、次のものが必要です。

  • 課金が有効になっている Google Cloud コンソール プロジェクト。
  • ロードバランサで処理される 1 つ以上の Compute Engine インスタンスのグループ。
  • ロードバランサのアドレスに登録されたドメイン名。
  • すべてのリクエストに ID があることを確認するアプリケーション コード。

Compute Engine インスタンスをまだ設定していない場合は、Compute Engine の IAP の設定をご覧ください。

IAP は、Google が管理する OAuth クライアントを使用してユーザーを認証します。組織内のユーザーのみが IAP 対応アプリケーションにアクセスできます。組織外のユーザーにアクセスを許可するには、外部アプリケーション用に IAP を有効にするをご覧ください。

IAP の有効化

Console

Google Cloud コンソールを使用して IAP を有効にする場合、Google が管理する OAuth クライアントは使用できません。

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: 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, 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.