為 App Engine 啟用 IAP

本頁說明如何使用 Identity-Aware Proxy (IAP) 保護 App Engine 執行個體。

事前準備

如要為 App Engine 啟用 IAP，請先準備好下列項目：

• 啟用計費功能的 Google Cloud 主控台專案。

如果您尚未設定 App Engine 執行個體，請參閱部署 App Engine 一文，取得完整逐步操作說明。

IAP 會使用 Google 代管的 OAuth 用戶端來驗證使用者。只有貴機構的使用者可以存取啟用 IAP 的應用程式。 如要允許機構外部使用者存取，請參閱「為外部應用程式啟用 IAP」。

注意： 您可以在預覽版中，使用 Google 管理的 OAuth 用戶端驗證使用者。

啟用 IAP

控制台

使用 Google Cloud 控制台啟用 IAP 時，無法使用 Google 代管的 OAuth 用戶端。

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.
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.

Turning on IAP

1. On the Identity-Aware Proxy page, under Applications, find the application you want to restrict access to. To turn on IAP for a resource, toggle the on/off switch in the IAP column.
   
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 principals with the IAP-Secured Web App User (roles/iap.httpsResourceAccessor) 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. Click the URL that appears and sign in.
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 applications that you want to protect with IAP.

   gcloud config set project PROJECT_ID

5. To enable IAP, run the following command.

   gcloud iap web enable --resource-type=app-engine --versions=version

6. Add principals who should have the IAP-secured Web App user role to the project.

   gcloud projects add-iam-policy-binding PROJECT_ID \
          --member=PRINCIPAL_IDENTIFIER \
          --role=roles/iap.httpsResourceAccessor

   • Replace PROJECT_ID with your project ID.
   • Replace PRINCIPAL_IDENTIFIER with the necessary principals. This can be a type of domain, group, serviceAccount, or user. For example, user:[e-mail].

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://appengine.googleapis.com/v1/apps/PROJECT_ID?updateMask=iap"
   

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.

注意：如果 App Engine 應用程式包含多項服務，如要公開存取部分服務，並限制其他服務的存取權，請在整個應用程式中啟用 IAP，然後將 IAP 安全網頁應用程式使用者角色授予 allUsers 或 allAuthenticatedUsers，讓這些服務可公開存取。

角色式存取權： 只有在這個專案中擁有「受 IAP 保護的網頁應用程式使用者」roles/iap.httpsResourceAccessor 角色的主體，才能獲得存取權。即使是具有廣泛權限的角色 (例如 Owner 或 Editor)，也無法自動存取受 IAP 保護的應用程式。

測試使用者驗證

1. 獲得角色後，主體就能透過 IAP 驗證存取應用程式。使用已獲授權的 Google 帳戶存取應用程式網址，該帳戶必須具備「受 IAP 保護的網頁應用程式使用者」角色 (roles/iap.httpsResourceAccessor)。

2. 使用 Chrome 的無痕式視窗存取應用程式，並在系統提示時登入。獲派「受 IAP 保護的網路應用程式使用者」角色的使用者，只要通過驗證即可存取應用程式。如果使用者未獲派必要角色或驗證失敗，就無法存取應用程式。