Manage GCP App Engine IAP Service Permissions

The gcp:iap/appEngineServiceIamMember:AppEngineServiceIamMember resource, part of the Pulumi GCP provider, grants IAM roles to individual members for Identity-Aware Proxy protected App Engine services. This guide focuses on three capabilities: adding individual users non-authoritatively, managing complete member lists for a role, and time-limited access with IAM Conditions.

This resource manages access to existing App Engine services that already have IAP enabled. The examples are intentionally small. Combine them with your own App Engine deployments and IAP configuration.

Grant access to a single user

Most IAP configurations start by granting individual users access to protected services without disrupting existing permissions.

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

const member = new gcp.iap.AppEngineServiceIamMember("member", {
    project: version.project,
    appId: version.project,
    service: version.service,
    role: "roles/iap.httpsResourceAccessor",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.iap.AppEngineServiceIamMember("member",
    project=version["project"],
    app_id=version["project"],
    service=version["service"],
    role="roles/iap.httpsResourceAccessor",
    member="user:jane@example.com")

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/iap"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := iap.NewAppEngineServiceIamMember(ctx, "member", &iap.AppEngineServiceIamMemberArgs{
			Project: pulumi.Any(version.Project),
			AppId:   pulumi.Any(version.Project),
			Service: pulumi.Any(version.Service),
			Role:    pulumi.String("roles/iap.httpsResourceAccessor"),
			Member:  pulumi.String("user:jane@example.com"),
		})
		if err != nil {
			return err
		}
		return nil
	})
}

using System.Collections.Generic;
using System.Linq;
using Pulumi;
using Gcp = Pulumi.Gcp;

return await Deployment.RunAsync(() => 
{
    var member = new Gcp.Iap.AppEngineServiceIamMember("member", new()
    {
        Project = version.Project,
        AppId = version.Project,
        Service = version.Service,
        Role = "roles/iap.httpsResourceAccessor",
        Member = "user:jane@example.com",
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.iap.AppEngineServiceIamMember;
import com.pulumi.gcp.iap.AppEngineServiceIamMemberArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;

public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }

    public static void stack(Context ctx) {
        var member = new AppEngineServiceIamMember("member", AppEngineServiceIamMemberArgs.builder()
            .project(version.project())
            .appId(version.project())
            .service(version.service())
            .role("roles/iap.httpsResourceAccessor")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:iap:AppEngineServiceIamMember
    properties:
      project: ${version.project}
      appId: ${version.project}
      service: ${version.service}
      role: roles/iap.httpsResourceAccessor
      member: user:jane@example.com

The member property specifies the identity receiving access, using the format “user:email@example.com”. The role property sets the IAP permission level; “roles/iap.httpsResourceAccessor” allows HTTPS access to the service. This resource is non-authoritative: it adds the member without removing others who already have the role.

Grant access to multiple users at once

When onboarding teams, you can manage the complete member list for a role using a binding resource.

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

const binding = new gcp.iap.AppEngineServiceIamBinding("binding", {
    project: version.project,
    appId: version.project,
    service: version.service,
    role: "roles/iap.httpsResourceAccessor",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.iap.AppEngineServiceIamBinding("binding",
    project=version["project"],
    app_id=version["project"],
    service=version["service"],
    role="roles/iap.httpsResourceAccessor",
    members=["user:jane@example.com"])

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/iap"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := iap.NewAppEngineServiceIamBinding(ctx, "binding", &iap.AppEngineServiceIamBindingArgs{
			Project: pulumi.Any(version.Project),
			AppId:   pulumi.Any(version.Project),
			Service: pulumi.Any(version.Service),
			Role:    pulumi.String("roles/iap.httpsResourceAccessor"),
			Members: pulumi.StringArray{
				pulumi.String("user:jane@example.com"),
			},
		})
		if err != nil {
			return err
		}
		return nil
	})
}

using System.Collections.Generic;
using System.Linq;
using Pulumi;
using Gcp = Pulumi.Gcp;

return await Deployment.RunAsync(() => 
{
    var binding = new Gcp.Iap.AppEngineServiceIamBinding("binding", new()
    {
        Project = version.Project,
        AppId = version.Project,
        Service = version.Service,
        Role = "roles/iap.httpsResourceAccessor",
        Members = new[]
        {
            "user:jane@example.com",
        },
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.iap.AppEngineServiceIamBinding;
import com.pulumi.gcp.iap.AppEngineServiceIamBindingArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;

public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }

    public static void stack(Context ctx) {
        var binding = new AppEngineServiceIamBinding("binding", AppEngineServiceIamBindingArgs.builder()
            .project(version.project())
            .appId(version.project())
            .service(version.service())
            .role("roles/iap.httpsResourceAccessor")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:iap:AppEngineServiceIamBinding
    properties:
      project: ${version.project}
      appId: ${version.project}
      service: ${version.service}
      role: roles/iap.httpsResourceAccessor
      members:
        - user:jane@example.com

The members property takes an array of identities who should have the role. This resource is authoritative for the specified role: it replaces the member list, removing anyone not in the array. Other roles on the service remain unchanged.

Add time-limited access with IAM Conditions

Temporary access grants expire automatically when you attach IAM Conditions to assignments.

import * as pulumi from "@pulumi/pulumi";
import * as gcp from "@pulumi/gcp";

const member = new gcp.iap.AppEngineServiceIamMember("member", {
    project: version.project,
    appId: version.project,
    service: version.service,
    role: "roles/iap.httpsResourceAccessor",
    member: "user:jane@example.com",
    condition: {
        title: "expires_after_2019_12_31",
        description: "Expiring at midnight of 2019-12-31",
        expression: "request.time < timestamp(\"2020-01-01T00:00:00Z\")",
    },
});

import pulumi
import pulumi_gcp as gcp

member = gcp.iap.AppEngineServiceIamMember("member",
    project=version["project"],
    app_id=version["project"],
    service=version["service"],
    role="roles/iap.httpsResourceAccessor",
    member="user:jane@example.com",
    condition={
        "title": "expires_after_2019_12_31",
        "description": "Expiring at midnight of 2019-12-31",
        "expression": "request.time < timestamp(\"2020-01-01T00:00:00Z\")",
    })

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/iap"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := iap.NewAppEngineServiceIamMember(ctx, "member", &iap.AppEngineServiceIamMemberArgs{
			Project: pulumi.Any(version.Project),
			AppId:   pulumi.Any(version.Project),
			Service: pulumi.Any(version.Service),
			Role:    pulumi.String("roles/iap.httpsResourceAccessor"),
			Member:  pulumi.String("user:jane@example.com"),
			Condition: &iap.AppEngineServiceIamMemberConditionArgs{
				Title:       pulumi.String("expires_after_2019_12_31"),
				Description: pulumi.String("Expiring at midnight of 2019-12-31"),
				Expression:  pulumi.String("request.time < timestamp(\"2020-01-01T00:00:00Z\")"),
			},
		})
		if err != nil {
			return err
		}
		return nil
	})
}

using System.Collections.Generic;
using System.Linq;
using Pulumi;
using Gcp = Pulumi.Gcp;

return await Deployment.RunAsync(() => 
{
    var member = new Gcp.Iap.AppEngineServiceIamMember("member", new()
    {
        Project = version.Project,
        AppId = version.Project,
        Service = version.Service,
        Role = "roles/iap.httpsResourceAccessor",
        Member = "user:jane@example.com",
        Condition = new Gcp.Iap.Inputs.AppEngineServiceIamMemberConditionArgs
        {
            Title = "expires_after_2019_12_31",
            Description = "Expiring at midnight of 2019-12-31",
            Expression = "request.time < timestamp(\"2020-01-01T00:00:00Z\")",
        },
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.iap.AppEngineServiceIamMember;
import com.pulumi.gcp.iap.AppEngineServiceIamMemberArgs;
import com.pulumi.gcp.iap.inputs.AppEngineServiceIamMemberConditionArgs;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Paths;

public class App {
    public static void main(String[] args) {
        Pulumi.run(App::stack);
    }

    public static void stack(Context ctx) {
        var member = new AppEngineServiceIamMember("member", AppEngineServiceIamMemberArgs.builder()
            .project(version.project())
            .appId(version.project())
            .service(version.service())
            .role("roles/iap.httpsResourceAccessor")
            .member("user:jane@example.com")
            .condition(AppEngineServiceIamMemberConditionArgs.builder()
                .title("expires_after_2019_12_31")
                .description("Expiring at midnight of 2019-12-31")
                .expression("request.time < timestamp(\"2020-01-01T00:00:00Z\")")
                .build())
            .build());

    }
}

resources:
  member:
    type: gcp:iap:AppEngineServiceIamMember
    properties:
      project: ${version.project}
      appId: ${version.project}
      service: ${version.service}
      role: roles/iap.httpsResourceAccessor
      member: user:jane@example.com
      condition:
        title: expires_after_2019_12_31
        description: Expiring at midnight of 2019-12-31
        expression: request.time < timestamp("2020-01-01T00:00:00Z")

The condition block defines when access expires. The expression property uses Common Expression Language (CEL) to compare request time against a timestamp. The title property identifies the condition in audit logs. When the condition evaluates to false, the member loses access automatically. Note that IAM Conditions have known limitations; review Google Cloud’s documentation before relying on complex expressions.

Beyond these examples

These snippets focus on specific IAM member features: single-member and multi-member grants, and time-based access with IAM Conditions. They’re intentionally minimal rather than full access control configurations.

The examples assume pre-existing infrastructure such as App Engine services with IAP enabled, and a GCP project with appropriate IAM permissions. They focus on granting access rather than provisioning the underlying services.

To keep things focused, common IAM patterns are omitted, including:

Full policy replacement (AppEngineServiceIamPolicy resource)
Condition descriptions and complex expressions
Special identity types (allUsers, serviceAccount, group, domain)
Custom role definitions and federated identities

These omissions are intentional: the goal is to illustrate how IAM member grants are wired, not provide drop-in access control modules. See the AppEngineServiceIamMember resource reference for all available configuration options.

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Frequently Asked Questions

Resource Conflicts & Compatibility

Can I use AppEngineServiceIamPolicy with AppEngineServiceIamBinding or AppEngineServiceIamMember?

No, AppEngineServiceIamPolicy cannot be used together with AppEngineServiceIamBinding or AppEngineServiceIamMember because they will conflict over policy control. Choose either Policy alone (authoritative) or Binding/Member together (non-authoritative).

Can I use AppEngineServiceIamBinding and AppEngineServiceIamMember together?

Yes, but only if they don’t grant privileges to the same role. If both resources target the same role, they will conflict.

What's the difference between AppEngineServiceIamPolicy, Binding, and Member?

AppEngineServiceIamPolicy is authoritative and replaces the entire IAM policy. AppEngineServiceIamBinding is authoritative for a specific role, managing all members for that role while preserving other roles. AppEngineServiceIamMember is non-authoritative, adding individual members without affecting other members or roles.

IAM Configuration & Roles

How do I specify a custom IAM role?

Custom roles must use the format [projects|organizations]/{parent-name}/roles/{role-name}. For example: projects/my-project/roles/my-custom-role or organizations/my-org/roles/my-custom-role.

How do I add time-based or conditional access restrictions?

Use the condition property with title, description, and expression fields. For example, to expire access at a specific time: expression: "request.time < timestamp(\"2020-01-01T00:00:00Z\")".

What are the limitations of IAM Conditions?

IAM Conditions are supported but have known limitations. Review the GCP IAM Conditions limitations documentation if you encounter issues.

Member Identities & Resource Behavior

What member identity formats are supported?

You can use: allUsers, allAuthenticatedUsers, user:{email}, serviceAccount:{email}, group:{email}, domain:{domain}, projectOwner:{projectid}, projectEditor:{projectid}, projectViewer:{projectid}, and federated identities like principal://iam.googleapis.com/locations/global/workforcePools/{pool}/subject/{subject}.

What properties can't be changed after creation?

All core properties are immutable: appId, member, project, role, service, and condition. To change any of these, you must recreate the resource.

Using a different cloud?

Explore iam guides for other cloud providers:

AWS Guides Azure Guides