How do you add Identity Aware Proxy (IAP) in front of your App Engine app?
To add Identity Aware Proxy (IAP) in front of your App Engine app on Google Cloud Platform (GCP), you need to follow a series of steps. IAP allows you to control access to your applications and resources based on user identity and context. By integrating IAP, you can enhance the security of your App Engine app by adding an additional layer of authentication and authorization.
Here is a comprehensive guide on how to add IAP in front of your App Engine app:
Step 1: Enable IAP API
First, you need to enable the Identity-Aware Proxy API in your GCP project. To do this, go to the GCP Console, select your project, and navigate to the "APIs & Services" -> "Library" page. Search for "Identity-Aware Proxy API" and enable it.
Step 2: Configure OAuth consent screen
Next, you need to configure the OAuth consent screen. This step is required to define the information that will be presented to users when they authenticate with your App Engine app. To configure the consent screen, go to the GCP Console, select your project, and navigate to the "APIs & Services" -> "OAuth consent screen" page. Provide the necessary information such as the application name, authorized domains, and privacy policy URL.
Step 3: Set up OAuth 2.0 client ID
To authenticate users with IAP, you need to create an OAuth 2.0 client ID. This client ID will be used to identify your App Engine app. Go to the GCP Console, select your project, and navigate to the "APIs & Services" -> "Credentials" page. Click on "Create credentials" and select "OAuth client ID". Choose "Web application" as the application type, provide a name for the client ID, and specify the authorized JavaScript origins and redirect URIs. Make sure to include the appropriate URLs for your App Engine app.
Step 4: Configure IAP settings
Now it's time to configure the IAP settings for your App Engine app. Go to the GCP Console, select your project, and navigate to the "Security" -> "Identity-Aware Proxy" page. Click on "App Engine app" and select your App Engine app from the dropdown menu. In the "Access settings" section, you can define who has access to your app by specifying individual email addresses or Google groups. You can also choose to allow all users with a Google account to access your app. Additionally, you can enable or disable the "Cloud IAP protected web service" option, which restricts access to your app only through IAP.
Step 5: Test and validate
After configuring IAP, it's important to test and validate the setup. Open a web browser and try accessing your App Engine app. You should be redirected to the Google sign-in page, where you need to authenticate with a Google account that has access to your app. Once authenticated, you should be able to access your App Engine app.
To add Identity Aware Proxy (IAP) in front of your App Engine app, you need to enable the IAP API, configure the OAuth consent screen, set up an OAuth 2.0 client ID, configure IAP settings for your App Engine app, and test the setup. By following these steps, you can enhance the security of your App Engine app by controlling access based on user identity and context.
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