Manage GCP Identity-Aware Proxy IAM Policies

The gcp:iap/appEngineVersionIamPolicy:AppEngineVersionIamPolicy resource, part of the Pulumi GCP provider, manages IAM policies that control Identity-Aware Proxy access to specific App Engine versions. This guide focuses on four capabilities: authoritative policy replacement, role-based binding management, incremental member addition, and time-based conditional access.

These resources reference existing App Engine versions by project, appId, service, and versionId. The examples are intentionally small. Combine them with your own App Engine deployments and IAM role definitions.

Replace the entire IAM policy for a version

When you need complete control over who can access an App Engine version through IAP, you can set the entire policy at once.

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

const admin = gcp.organizations.getIAMPolicy({
    bindings: [{
        role: "roles/iap.httpsResourceAccessor",
        members: ["user:jane@example.com"],
    }],
});
const policy = new gcp.iap.AppEngineVersionIamPolicy("policy", {
    project: version.project,
    appId: version.project,
    service: version.service,
    versionId: version.versionId,
    policyData: admin.then(admin => admin.policyData),
});

import pulumi
import pulumi_gcp as gcp

admin = gcp.organizations.get_iam_policy(bindings=[{
    "role": "roles/iap.httpsResourceAccessor",
    "members": ["user:jane@example.com"],
}])
policy = gcp.iap.AppEngineVersionIamPolicy("policy",
    project=version["project"],
    app_id=version["project"],
    service=version["service"],
    version_id=version["versionId"],
    policy_data=admin.policy_data)

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		admin, err := organizations.LookupIAMPolicy(ctx, &organizations.LookupIAMPolicyArgs{
			Bindings: []organizations.GetIAMPolicyBinding{
				{
					Role: "roles/iap.httpsResourceAccessor",
					Members: []string{
						"user:jane@example.com",
					},
				},
			},
		}, nil)
		if err != nil {
			return err
		}
		_, err = iap.NewAppEngineVersionIamPolicy(ctx, "policy", &iap.AppEngineVersionIamPolicyArgs{
			Project:    pulumi.Any(version.Project),
			AppId:      pulumi.Any(version.Project),
			Service:    pulumi.Any(version.Service),
			VersionId:  pulumi.Any(version.VersionId),
			PolicyData: pulumi.String(admin.PolicyData),
		})
		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 admin = Gcp.Organizations.GetIAMPolicy.Invoke(new()
    {
        Bindings = new[]
        {
            new Gcp.Organizations.Inputs.GetIAMPolicyBindingInputArgs
            {
                Role = "roles/iap.httpsResourceAccessor",
                Members = new[]
                {
                    "user:jane@example.com",
                },
            },
        },
    });

    var policy = new Gcp.Iap.AppEngineVersionIamPolicy("policy", new()
    {
        Project = version.Project,
        AppId = version.Project,
        Service = version.Service,
        VersionId = version.VersionId,
        PolicyData = admin.Apply(getIAMPolicyResult => getIAMPolicyResult.PolicyData),
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.organizations.OrganizationsFunctions;
import com.pulumi.gcp.organizations.inputs.GetIAMPolicyArgs;
import com.pulumi.gcp.iap.AppEngineVersionIamPolicy;
import com.pulumi.gcp.iap.AppEngineVersionIamPolicyArgs;
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) {
        final var admin = OrganizationsFunctions.getIAMPolicy(GetIAMPolicyArgs.builder()
            .bindings(GetIAMPolicyBindingArgs.builder()
                .role("roles/iap.httpsResourceAccessor")
                .members("user:jane@example.com")
                .build())
            .build());

        var policy = new AppEngineVersionIamPolicy("policy", AppEngineVersionIamPolicyArgs.builder()
            .project(version.project())
            .appId(version.project())
            .service(version.service())
            .versionId(version.versionId())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:iap:AppEngineVersionIamPolicy
    properties:
      project: ${version.project}
      appId: ${version.project}
      service: ${version.service}
      versionId: ${version.versionId}
      policyData: ${admin.policyData}
variables:
  admin:
    fn::invoke:
      function: gcp:organizations:getIAMPolicy
      arguments:
        bindings:
          - role: roles/iap.httpsResourceAccessor
            members:
              - user:jane@example.com

The AppEngineVersionIamPolicy resource is authoritative: it replaces any existing IAM policy on the version. The policyData property comes from the getIAMPolicy data source, which defines role bindings. The project, appId, service, and versionId properties identify the specific App Engine version. This resource cannot be used alongside AppEngineVersionIamBinding or AppEngineVersionIamMember resources, as they would conflict over policy ownership.

Grant a role to multiple members at once

Teams often need to assign the same role to several users simultaneously while preserving other roles.

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 is authoritative for a single role: it grants that role to all members in the list and removes any members not included. Other roles on the version remain unchanged. The members property accepts user accounts, service accounts, groups, and domains in standard IAM format.

Add a single member to a role incrementally

When you need to grant access to one user without affecting existing members, use the non-authoritative member resource.

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 AppEngineVersionIamMember resource adds one member to a role without removing other members. This is non-authoritative: multiple Member resources can target the same role, and existing members are preserved. The member property specifies a single identity in IAM format.

Apply time-based access with IAM Conditions

Access requirements sometimes include expiration dates or other conditional logic.

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

const admin = gcp.organizations.getIAMPolicy({
    bindings: [{
        role: "roles/iap.httpsResourceAccessor",
        members: ["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\")",
        },
    }],
});
const policy = new gcp.iap.AppEngineVersionIamPolicy("policy", {
    project: version.project,
    appId: version.project,
    service: version.service,
    versionId: version.versionId,
    policyData: admin.then(admin => admin.policyData),
});

import pulumi
import pulumi_gcp as gcp

admin = gcp.organizations.get_iam_policy(bindings=[{
    "role": "roles/iap.httpsResourceAccessor",
    "members": ["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\")",
    },
}])
policy = gcp.iap.AppEngineVersionIamPolicy("policy",
    project=version["project"],
    app_id=version["project"],
    service=version["service"],
    version_id=version["versionId"],
    policy_data=admin.policy_data)

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		admin, err := organizations.LookupIAMPolicy(ctx, &organizations.LookupIAMPolicyArgs{
			Bindings: []organizations.GetIAMPolicyBinding{
				{
					Role: "roles/iap.httpsResourceAccessor",
					Members: []string{
						"user:jane@example.com",
					},
					Condition: {
						Title:       "expires_after_2019_12_31",
						Description: pulumi.StringRef("Expiring at midnight of 2019-12-31"),
						Expression:  "request.time < timestamp(\"2020-01-01T00:00:00Z\")",
					},
				},
			},
		}, nil)
		if err != nil {
			return err
		}
		_, err = iap.NewAppEngineVersionIamPolicy(ctx, "policy", &iap.AppEngineVersionIamPolicyArgs{
			Project:    pulumi.Any(version.Project),
			AppId:      pulumi.Any(version.Project),
			Service:    pulumi.Any(version.Service),
			VersionId:  pulumi.Any(version.VersionId),
			PolicyData: pulumi.String(admin.PolicyData),
		})
		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 admin = Gcp.Organizations.GetIAMPolicy.Invoke(new()
    {
        Bindings = new[]
        {
            new Gcp.Organizations.Inputs.GetIAMPolicyBindingInputArgs
            {
                Role = "roles/iap.httpsResourceAccessor",
                Members = new[]
                {
                    "user:jane@example.com",
                },
                Condition = new Gcp.Organizations.Inputs.GetIAMPolicyBindingConditionInputArgs
                {
                    Title = "expires_after_2019_12_31",
                    Description = "Expiring at midnight of 2019-12-31",
                    Expression = "request.time < timestamp(\"2020-01-01T00:00:00Z\")",
                },
            },
        },
    });

    var policy = new Gcp.Iap.AppEngineVersionIamPolicy("policy", new()
    {
        Project = version.Project,
        AppId = version.Project,
        Service = version.Service,
        VersionId = version.VersionId,
        PolicyData = admin.Apply(getIAMPolicyResult => getIAMPolicyResult.PolicyData),
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.organizations.OrganizationsFunctions;
import com.pulumi.gcp.organizations.inputs.GetIAMPolicyArgs;
import com.pulumi.gcp.iap.AppEngineVersionIamPolicy;
import com.pulumi.gcp.iap.AppEngineVersionIamPolicyArgs;
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) {
        final var admin = OrganizationsFunctions.getIAMPolicy(GetIAMPolicyArgs.builder()
            .bindings(GetIAMPolicyBindingArgs.builder()
                .role("roles/iap.httpsResourceAccessor")
                .members("user:jane@example.com")
                .condition(GetIAMPolicyBindingConditionArgs.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())
            .build());

        var policy = new AppEngineVersionIamPolicy("policy", AppEngineVersionIamPolicyArgs.builder()
            .project(version.project())
            .appId(version.project())
            .service(version.service())
            .versionId(version.versionId())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:iap:AppEngineVersionIamPolicy
    properties:
      project: ${version.project}
      appId: ${version.project}
      service: ${version.service}
      versionId: ${version.versionId}
      policyData: ${admin.policyData}
variables:
  admin:
    fn::invoke:
      function: gcp:organizations:getIAMPolicy
      arguments:
        bindings:
          - role: roles/iap.httpsResourceAccessor
            members:
              - 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")

IAM Conditions attach temporal or attribute-based constraints to role bindings. The condition block requires a title, expression, and optional description. The expression uses Common Expression Language (CEL) to define when the binding applies. Here, access expires at midnight on 2020-01-01. IAM Conditions have known limitations documented by Google Cloud; review those before relying on complex conditional logic.

Beyond these examples

These snippets focus on specific IAM management features: authoritative vs non-authoritative IAM management, policy/binding/member resource types, and IAM Conditions for temporal access control. 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 GCP projects with IAP enabled. They focus on configuring IAM policies rather than provisioning the underlying App Engine resources.

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

Multiple conditions per binding
Combining Policy with Binding/Member resources (causes conflicts)
Custom IAM roles (examples use predefined roles only)
Service account impersonation and delegation

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

Let's manage GCP Identity-Aware Proxy IAM Policies

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Frequently Asked Questions

Resource Selection & Conflicts

What's the difference between AppEngineVersionIamPolicy, AppEngineVersionIamBinding, and AppEngineVersionIamMember?

AppEngineVersionIamPolicy is authoritative and replaces the entire IAM policy. AppEngineVersionIamBinding is authoritative for a specific role, preserving other roles. AppEngineVersionIamMember is non-authoritative and adds individual members without affecting other members of the role.

Can I use AppEngineVersionIamPolicy with AppEngineVersionIamBinding or AppEngineVersionIamMember?

No, AppEngineVersionIamPolicy cannot be used with AppEngineVersionIamBinding or AppEngineVersionIamMember as they will conflict over policy management. Choose one approach: use Policy alone or use Binding/Member together.

Can I use AppEngineVersionIamBinding and AppEngineVersionIamMember together?

Yes, but only if they manage different roles. Using both resources for the same role will cause conflicts.

Configuration & Properties

What properties are required to create an AppEngineVersionIamPolicy?

You must provide appId, project, service, versionId, and policyData. All identifier properties are immutable after creation.

How do I generate the policyData for AppEngineVersionIamPolicy?

Use the gcp.organizations.getIAMPolicy data source to generate policy data, then pass it to the policyData property.

What properties can't be changed after creation?

The appId, project, service, and versionId properties are all immutable and cannot be modified after the resource is created.

IAM Conditions

Does this resource support IAM Conditions?

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

How do I add time-based access restrictions using IAM Conditions?

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

Can I use IAM Conditions with all three resource types?

Yes, AppEngineVersionIamPolicy, AppEngineVersionIamBinding, and AppEngineVersionIamMember all support IAM Conditions as shown in the examples.

Using a different cloud?

Explore security guides for other cloud providers:

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