Manage GCP Identity-Aware Proxy IAM Policies

The gcp:iap/appEngineVersionIamPolicy:AppEngineVersionIamPolicy resource, part of the Pulumi GCP provider, manages IAM permissions for Identity-Aware Proxy (IAP) access to specific App Engine versions. This guide focuses on three capabilities: authoritative policy replacement, role-based member management, and time-based access with IAM Conditions.

These resources reference existing App Engine versions and control who can access them through IAP. The examples are intentionally small. Combine them with your own App Engine infrastructure and organizational access patterns.

Replace the entire IAM policy for a version

When you need complete control over IAP access permissions, you can set the entire policy at once, replacing any existing configuration.

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 the entire IAM policy for the specified version. The policyData comes from the getIAMPolicy data source, which defines bindings between roles and members. The project, appId, service, and versionId properties identify which App Engine version to protect. This approach gives you complete control but cannot be used alongside AppEngineVersionIamBinding or AppEngineVersionIamMember resources, as they would conflict over policy ownership.

Grant a role to multiple members

Teams often need to grant the same IAP access role to several users without affecting 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 sets the complete member list for that role while preserving other roles in the policy. The members property accepts a list of identities (users, service accounts, groups). You can use multiple Binding resources for different roles, but only one Binding per role to avoid conflicts.

Add a single member to a role

When onboarding individual users, you can add them to a role without modifying existing members.

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 is non-authoritative: it adds one member to a role without affecting other members. The member property specifies a single identity. This resource is safe to use alongside AppEngineVersionIamBinding resources as long as they target different roles.

Apply time-based access with IAM Conditions

Access requirements sometimes include expiration dates or time windows for temporary permissions.

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 constraints to permissions. The condition block includes a title for identification, an optional description, and an expression using Common Expression Language (CEL). Here, the expression checks that the request time is before midnight on January 1, 2020. IAM Conditions work with all three resource types (Policy, Binding, Member) but have known limitations documented by Google Cloud.

Beyond these examples

These snippets focus on specific IAM management features: authoritative vs non-authoritative IAM management, role-based access control for IAP-protected versions, and time-based access with IAM Conditions. They’re intentionally minimal rather than full access control systems.

The examples reference pre-existing infrastructure such as App Engine applications with deployed versions and IAP-enabled App Engine services. They focus on configuring IAM permissions rather than provisioning the underlying App Engine resources.

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

Combining Policy with Binding/Member resources (causes conflicts)
Multiple Binding resources for the same role (causes conflicts)
Custom IAM roles (requires full role path)
Audit logging and access monitoring

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

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

Choose based on your needs:

AppEngineVersionIamPolicy - Authoritative control of the entire IAM policy (replaces existing policy)
AppEngineVersionIamBinding - Authoritative control of a specific role (preserves other roles)
AppEngineVersionIamMember - Non-authoritative addition of individual members (preserves other members for the role)

Why am I getting IAM policy conflicts between my resources?

AppEngineVersionIamPolicy cannot be used with AppEngineVersionIamBinding or AppEngineVersionIamMember as they compete to control the same policy. Choose either Policy alone, or use Binding/Member together.

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 by either Binding or Member, not both.

Configuration & Setup

How do I set an IAM policy for an App Engine version?

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

What properties are required to configure IAM for an App Engine version?

You must provide appId, project, service, and versionId to identify the App Engine version, plus policyData (for Policy) or role and members (for Binding/Member).

What properties can't be changed after creation?

The appId, project, service, and versionId properties are immutable and cannot be modified after resource creation.

IAM Conditions

Can I use IAM Conditions to add time-based or attribute-based access controls?

Yes, all three resources support IAM Conditions with title, description, and expression fields. However, IAM Conditions have known limitations that you should review before use.

How do I add a time-based condition to an IAM binding?

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.

Using a different cloud?

Explore security guides for other cloud providers:

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