Managing access to IAP-secured resources

This page describes how to manage individual or group access to Identity-Aware Proxy (IAP)-secured resources at the resource level.

Overview

IAP enables you to configure IAP policies for individual resources in a Google Cloud project. Multiple apps within a project can each have different access policies. This includes projects that have Compute Engine, Google Kubernetes Engine, and App Engine apps. For App Engine apps, individual versions and services can have different access policies applied.

To manage project level and higher access, use the IAM admin page. Lists of users who have access (the "members") at the project level applies to all IAP-secured resources in the project.

Before you begin

Before you begin, you'll need the following:

  • A IAP-secured resource to which you want to add individual or group access.
  • User or group names for which you want to add access.

Turning IAP on and off

To turn IAP on and off, certain permissions are needed. The following table shows the permission needed for each app type.

App type Permission required
App Engine appengine.applications.update
Compute Engine or Google Kubernetes Engine compute.backendServices.update

These permissions are granted by roles such as Project Editor, App Engine Admin, and Compute Network Admin. While these roles allow turning IAP on and off, they don't have the permissions needed to modify access policies.

In addition, turning IAP on with the Cloud Console might also require the clientauthconfig.clients.create and clientauthconfig.clients.getWithSecret permissions. These permissions are granted by the Project Editor role.

To learn more about granting roles, see Granting, changing, and revoking access.

Managing access in the Cloud Console

To control access to a IAP-secured resource with the Cloud Console, follow the process to add or remove access.

Add access

  1. Go to the Identity-Aware Proxy page.
    Go to the Identity-Aware Proxy page

  2. Select the resource you want to secure with IAP. The following resource selections secure a set group of resources:

    • All Web Services: All resources in the project will be secured. Note that this is not the same as granting project level access with the IAM admin page. A user granted the IAP Policy Admin role at the All Web Services resource level will only have permissions to IAP policies.

    • Backend Services: All backend services will be secured.

  3. On the right side Info panel, add the email addresses of groups or individuals to whom you want to grant an Identity and Access Management (IAM) role for the resource.

  4. Apply access policy roles to the member by selecting from the following roles in the Select a role dropdown:

    • Owner: Grants the same access as IAP Policy Admin. Use the IAP Policy Admin role instead. This role only allows modifying policies, and doesn't grant access to the app.

    • IAP Policy Admin: Grants administrator rights over IAP policies.

    • IAP-Secured Web App User: Grants access to the app and other HTTPS resources that use IAP.

    • Security Reviewer: Grants permission to view and audit IAP policies.

  5. When you're finished adding email addresses and setting roles, click Add

Remove access

  1. Go to the Identity-Aware Proxy page.
    Go to the Identity-Aware Proxy page
  2. Select the resource that is secured with IAP.
  3. On the right side Info panel, select the section that corresponds to the role you want to remove from a member.
  4. In the expanded section, next to each user or group name for which you want to remove the role, click Remove.
  5. In the Remove member dialog that appears, click Remove.

Managing access with the API

IAM provides a standard set of methods for creating and managing access control policies on Google Cloud resources.

Resources and Permissions

The IAP API enables you to apply IAM permissions to individual resources in a IAP-secured project. IAM permissions granted at a certain level apply to all levels underneath it. For example, a permission granted at the project level applies to all Google Cloud resources in the project. Access for project-level and above is managed in the IAM admin page, but will be displayed in the IAP admin page.

Users need certain permissions to access a IAP-secured app and use methods that update IAM policies. The iap.webServiceVersions.accessViaIAP permission grants access to the app. If you're using IAP to control access to administrative services like SSH and RDP, users will need the iap.tunnelInstances.accessViaIAP permission.

Each IAP resource has its own getIamPolicy and setIamPolicy permission that grants the ability to manage access policies for that resource and its children.

To call the IAM API, construct a call with a URL path to a resource. The following is an example call that gets the IAM policy for an App Engine app service version.

https://iap.googleapis.com/v1beta1/projects/PROJECT_NUMBER/iap_web/
appengine-APP_ID/services/SERVICE_ID/versions/VERSION_ID:getIamPolicy
Resource Type Description Path Permissions
iap.web Every IAP-secured web app in the project. This is the same as the All Web Services checkbox on the IAP admin page. 
https://iap.googleapis.com/v1beta1/projects/
PROJECT_NUMBER/iap_web
 iap.web.getIamPolicy

iap.web.setIamPolicy
iap.webTypes Either a backend service or an App Engine app. This is the same as the Backend Service and App Engine app checkboxes on the IAP admin page. Backend service

https://iap.googleapis.com/v1beta1/projects/
PROJECT_NUMBER/iap_web/compute


App Engine app 

https://iap.googleapis.com/v1beta1/projects/
PROJECT_NUMBER/iap_web/appengine-APP_ID
 iap.webTypes.getIamPolicy

iap.webTypes.setIamPolicy
iap.webServices Either a Compute Engine backend service or an App Engine app service. The backend service path can either specify either the backend service ID or the backend service name. Backend services

https://iap.googleapis.com/v1beta1/projects/
PROJECT_NUMBER/iap_web/compute/services/
BACKEND_SERVICE_ID or BACKEND_SERVICE_NAME


App Engine app 

https://iap.googleapis.com/v1beta1/projects/
PROJECT_NUMBER/iap_web/appengine-APP_ID/
services/APP_SERVICE_ID
 iap.webServices.getIamPolicy

iap.webServices.setIamPolicy
iap.webServiceVersions An App Engine service version. Compute Engine doesn't support versioning. 
https://iap.googleapis.com/v1beta1/projects/
PROJECT_NUMBER/iap_web/appengine-APP_ID/
services/APP_SERVICE_ID/versions/VERSION_ID
 iap.webServiceVersions.getIamPolicy

iap.webServiceVersions.setIamPolicy
iap.tunnel Every IAP-secured instance in the project. This is the same as the All Tunnel Resources checkbox on the IAP admin page. 
https://iap.googleapis.com/v1beta1/projects/
PROJECT_NUMBER/iap_tunnel
 iap.tunnel.getIamPolicy

iap.tunnel.setIamPolicy
iap.tunnelZones Every zone which has at least one instance. This is the same as a zone name checkbox on the IAP admin page, for example, us-central1-c. 
https://iap.googleapis.com/v1beta1/projects/
PROJECT_NUMBER/iap_tunnel/zones/ZONE_NAME
 iap.tunnelZones.getIamPolicy

iap.tunnelZones.setIamPolicy
iap.tunnelInstances An individual instance. 
https://iap.googleapis.com/v1beta1/projects/
PROJECT_NUMBER/iap_tunnel/zones/ZONE_NAME
/instances/INSTANCE_ID or INSTANCE_NAME
 iap.tunnelInstances.getIamPolicy

iap.tunnelInstances.setIamPolicy

Roles

The following table lists the IAP IAM roles with a corresponding list of all of the IAP-specific permissions each role includes. For more information about IAM roles see Managing Roles and Permissions.

Role Includes permission(s) Description
IAP-Secured Web App User (roles/iap.httpsResourceAccessor) iap.webServiceVersions.accessViaIAP Grants access to App Engine and Compute Engine resources.
IAP-Secured Tunnel User (roles/iap.tunnelResourceAccessor) iap.tunnelInstances.accessViaIAP Grants access to tunnel resources that use IAP.
IAP Policy Admin (roles/iap.admin) iap.web.getIamPolicy
iap.web.setIamPolicy
iap.webTypes.getIamPolicy
iap.webTypes.setIamPolicy
iap.webServices.getIamPolicy
iap.webServices.setIamPolicy
iap.webServiceVersions.getIamPolicy
iap.webServiceVersions.setIamPolicy		 Grants IAP administrative rights to manage IAP access policies of resources.

Public access

To grant everyone access to a resource, add one of the following members to its access list:

  • allAuthenticatedUsers: Anyone who is authenticated with a Google account or a service account.
  • allUsers: Anyone who is on the internet, including authenticated and unauthenticated users. The signed header for the request won't have a sub or email claim.

If public access is granted, IAP won't generate Cloud Audit Logs logs for the request.

Currently, bindings that grant public access can't have a condition associated with it. For example, a policy that allows anyone access to a resource if the request path starts with /public/ is invalid.