Manage GCP Identity-Aware Proxy IAM for App Engine

The gcp:iap/appEngineVersionIamMember:AppEngineVersionIamMember resource, part of the Pulumi GCP provider, grants IAM roles to identities for specific App Engine versions protected by Identity-Aware Proxy. This guide focuses on three capabilities: adding individual members to roles, managing multiple members with bindings, and time-limited access with IAM Conditions.

IAM resources for App Engine versions come in three flavors with different authoritativeness levels. AppEngineVersionIamMember is non-authoritative (preserves other members), AppEngineVersionIamBinding is authoritative for a given role (replaces all members for that role), and AppEngineVersionIamPolicy is fully authoritative (replaces the entire policy). The examples reference existing App Engine versions that must be deployed first. Combine them with your own application and service identifiers.

Grant access to a single user

Most IAP configurations add individual users to specific App Engine versions without affecting other members who already have the role.

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

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

import pulumi
import pulumi_gcp as gcp

member = gcp.iap.AppEngineVersionIamMember("member",
    project=version["project"],
    app_id=version["project"],
    service=version["service"],
    version_id=version["versionId"],
    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.NewAppEngineVersionIamMember(ctx, "member", &iap.AppEngineVersionIamMemberArgs{
			Project:   pulumi.Any(version.Project),
			AppId:     pulumi.Any(version.Project),
			Service:   pulumi.Any(version.Service),
			VersionId: pulumi.Any(version.VersionId),
			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.AppEngineVersionIamMember("member", new()
    {
        Project = version.Project,
        AppId = version.Project,
        Service = version.Service,
        VersionId = version.VersionId,
        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.AppEngineVersionIamMember;
import com.pulumi.gcp.iap.AppEngineVersionIamMemberArgs;
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 AppEngineVersionIamMember("member", AppEngineVersionIamMemberArgs.builder()
            .project(version.project())
            .appId(version.project())
            .service(version.service())
            .versionId(version.versionId())
            .role("roles/iap.httpsResourceAccessor")
            .member("user:jane@example.com")
            .build());

    }
}

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

The member property identifies who receives access using formats like “user:jane@example.com” for Google accounts or “serviceAccount:…” for service accounts. The role property specifies the IAM role to grant (here, roles/iap.httpsResourceAccessor allows HTTPS access). The appId, service, and versionId properties identify which App Engine version to protect. This resource is non-authoritative, meaning it adds the member without removing others who already have the role.

Grant access to multiple users at once

When onboarding teams, you can assign a role to multiple identities simultaneously using a binding resource.

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

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

import pulumi
import pulumi_gcp as gcp

binding = gcp.iap.AppEngineVersionIamBinding("binding",
    project=version["project"],
    app_id=version["project"],
    service=version["service"],
    version_id=version["versionId"],
    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.NewAppEngineVersionIamBinding(ctx, "binding", &iap.AppEngineVersionIamBindingArgs{
			Project:   pulumi.Any(version.Project),
			AppId:     pulumi.Any(version.Project),
			Service:   pulumi.Any(version.Service),
			VersionId: pulumi.Any(version.VersionId),
			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.AppEngineVersionIamBinding("binding", new()
    {
        Project = version.Project,
        AppId = version.Project,
        Service = version.Service,
        VersionId = version.VersionId,
        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.AppEngineVersionIamBinding;
import com.pulumi.gcp.iap.AppEngineVersionIamBindingArgs;
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 AppEngineVersionIamBinding("binding", AppEngineVersionIamBindingArgs.builder()
            .project(version.project())
            .appId(version.project())
            .service(version.service())
            .versionId(version.versionId())
            .role("roles/iap.httpsResourceAccessor")
            .members("user:jane@example.com")
            .build());

    }
}

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

The AppEngineVersionIamBinding resource manages all members for a specific role together. The members property takes a list of identities. Unlike AppEngineVersionIamMember, this resource is authoritative for the specified role, replacing any previous members. Use this when you want to define the complete set of users for a role in one place.

Add time-limited access with IAM Conditions

Temporary access grants expire automatically when conditions evaluate to false, eliminating manual cleanup.

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

const member = new gcp.iap.AppEngineVersionIamMember("member", {
    project: version.project,
    appId: version.project,
    service: version.service,
    versionId: version.versionId,
    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.AppEngineVersionIamMember("member",
    project=version["project"],
    app_id=version["project"],
    service=version["service"],
    version_id=version["versionId"],
    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.NewAppEngineVersionIamMember(ctx, "member", &iap.AppEngineVersionIamMemberArgs{
			Project:   pulumi.Any(version.Project),
			AppId:     pulumi.Any(version.Project),
			Service:   pulumi.Any(version.Service),
			VersionId: pulumi.Any(version.VersionId),
			Role:      pulumi.String("roles/iap.httpsResourceAccessor"),
			Member:    pulumi.String("user:jane@example.com"),
			Condition: &iap.AppEngineVersionIamMemberConditionArgs{
				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.AppEngineVersionIamMember("member", new()
    {
        Project = version.Project,
        AppId = version.Project,
        Service = version.Service,
        VersionId = version.VersionId,
        Role = "roles/iap.httpsResourceAccessor",
        Member = "user:jane@example.com",
        Condition = new Gcp.Iap.Inputs.AppEngineVersionIamMemberConditionArgs
        {
            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.AppEngineVersionIamMember;
import com.pulumi.gcp.iap.AppEngineVersionIamMemberArgs;
import com.pulumi.gcp.iap.inputs.AppEngineVersionIamMemberConditionArgs;
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 AppEngineVersionIamMember("member", AppEngineVersionIamMemberArgs.builder()
            .project(version.project())
            .appId(version.project())
            .service(version.service())
            .versionId(version.versionId())
            .role("roles/iap.httpsResourceAccessor")
            .member("user:jane@example.com")
            .condition(AppEngineVersionIamMemberConditionArgs.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:AppEngineVersionIamMember
    properties:
      project: ${version.project}
      appId: ${version.project}
      service: ${version.service}
      versionId: ${version.versionId}
      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 property adds time-based or attribute-based restrictions to the role grant. The expression uses Common Expression Language (CEL) to define when access is valid. Here, “request.time < timestamp(…)” expires access at midnight on 2020-01-01. The title and description help identify the condition in audit logs. IAM Conditions have known limitations documented by Google Cloud, particularly around resource-specific conditions.

Beyond these examples

These snippets focus on specific IAM grant 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 reference pre-existing infrastructure such as App Engine applications with deployed versions, and a GCP project with IAP enabled. They focus on granting access rather than provisioning the underlying application infrastructure.

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

Policy-level management (AppEngineVersionIamPolicy)
Custom role definitions and formats
Federated identity and workload identity pool configuration
Conflict resolution between Policy, Binding, and Member resources

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

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Frequently Asked Questions

Resource Selection & Conflicts

Which IAM resource should I use for managing App Engine version access?

Choose based on your management style:

AppEngineVersionIamPolicy sets the entire IAM policy (authoritative, replaces existing policy)
AppEngineVersionIamBinding manages all members for a specific role (authoritative per role, preserves other roles)
AppEngineVersionIamMember adds individual members to a role (non-authoritative, preserves other members)

Can I use AppEngineVersionIamPolicy with Binding or Member resources?

No, AppEngineVersionIamPolicy cannot be used with AppEngineVersionIamBinding or AppEngineVersionIamMember because they will conflict over policy management.

Can I use Binding and Member resources together?

Yes, but only if they don’t grant privileges to the same role. Each role must be managed exclusively by either AppEngineVersionIamBinding or AppEngineVersionIamMember.

Configuration & Identity Management

Can I modify the role, member, or other properties after creation?

No, all properties (appId, member, project, role, service, versionId, condition) are immutable. You must destroy and recreate the resource to change them.

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/customRole.

What member identity formats are supported?

Supported formats include:

allUsers or allAuthenticatedUsers for public/authenticated access
user:{email}, serviceAccount:{email}, group:{email} for specific identities
domain:{domain} for G Suite domains
projectOwner:{projectid}, projectEditor:{projectid}, projectViewer:{projectid} for project roles
Federated identities using principal identifiers (see GCP documentation)

IAM Conditions

Can I use IAM Conditions with this resource?

Yes, IAM Conditions are supported via the condition property, but they have known limitations. Review the GCP IAM Conditions documentation if you encounter issues.

Using a different cloud?

Explore security guides for other cloud providers:

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