Manage GCP IAP Web Region Backend Service IAM Permissions

The gcp:iap/webRegionBackendServiceIamBinding:WebRegionBackendServiceIamBinding resource, part of the Pulumi GCP provider, manages IAM role bindings for Identity-Aware Proxy regional backend services. This guide focuses on three capabilities: granting roles to multiple members, adding individual members to roles, and time-based access with IAM Conditions.

IAM bindings reference existing IAP-protected regional backend services and require a configured GCP project and region. The examples are intentionally small. Combine them with your own backend service infrastructure and identity management.

Grant a role to multiple members at once

Teams managing IAP access often assign the same role to multiple users or service accounts simultaneously, ensuring consistent permissions across a group.

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

const binding = new gcp.iap.WebRegionBackendServiceIamBinding("binding", {
    project: _default.project,
    region: _default.region,
    webRegionBackendService: _default.name,
    role: "roles/iap.httpsResourceAccessor",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.iap.WebRegionBackendServiceIamBinding("binding",
    project=default["project"],
    region=default["region"],
    web_region_backend_service=default["name"],
    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.NewWebRegionBackendServiceIamBinding(ctx, "binding", &iap.WebRegionBackendServiceIamBindingArgs{
			Project:                 pulumi.Any(_default.Project),
			Region:                  pulumi.Any(_default.Region),
			WebRegionBackendService: pulumi.Any(_default.Name),
			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.WebRegionBackendServiceIamBinding("binding", new()
    {
        Project = @default.Project,
        Region = @default.Region,
        WebRegionBackendService = @default.Name,
        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.WebRegionBackendServiceIamBinding;
import com.pulumi.gcp.iap.WebRegionBackendServiceIamBindingArgs;
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 WebRegionBackendServiceIamBinding("binding", WebRegionBackendServiceIamBindingArgs.builder()
            .project(default_.project())
            .region(default_.region())
            .webRegionBackendService(default_.name())
            .role("roles/iap.httpsResourceAccessor")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:iap:WebRegionBackendServiceIamBinding
    properties:
      project: ${default.project}
      region: ${default.region}
      webRegionBackendService: ${default.name}
      role: roles/iap.httpsResourceAccessor
      members:
        - user:jane@example.com

The role property specifies which IAP role to grant (here, roles/iap.httpsResourceAccessor). The members array lists all identities that receive this role. This binding is authoritative for the specified role: it replaces any existing member list for that role on the backend service. The webRegionBackendService, project, and region properties identify which IAP-protected resource to configure.

Add time-based access with IAM Conditions

Organizations with temporary contractors or time-limited projects use IAM Conditions to automatically expire access without manual revocation.

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

const binding = new gcp.iap.WebRegionBackendServiceIamBinding("binding", {
    project: _default.project,
    region: _default.region,
    webRegionBackendService: _default.name,
    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\")",
    },
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.iap.WebRegionBackendServiceIamBinding("binding",
    project=default["project"],
    region=default["region"],
    web_region_backend_service=default["name"],
    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\")",
    })

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.NewWebRegionBackendServiceIamBinding(ctx, "binding", &iap.WebRegionBackendServiceIamBindingArgs{
			Project:                 pulumi.Any(_default.Project),
			Region:                  pulumi.Any(_default.Region),
			WebRegionBackendService: pulumi.Any(_default.Name),
			Role:                    pulumi.String("roles/iap.httpsResourceAccessor"),
			Members: pulumi.StringArray{
				pulumi.String("user:jane@example.com"),
			},
			Condition: &iap.WebRegionBackendServiceIamBindingConditionArgs{
				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 binding = new Gcp.Iap.WebRegionBackendServiceIamBinding("binding", new()
    {
        Project = @default.Project,
        Region = @default.Region,
        WebRegionBackendService = @default.Name,
        Role = "roles/iap.httpsResourceAccessor",
        Members = new[]
        {
            "user:jane@example.com",
        },
        Condition = new Gcp.Iap.Inputs.WebRegionBackendServiceIamBindingConditionArgs
        {
            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.WebRegionBackendServiceIamBinding;
import com.pulumi.gcp.iap.WebRegionBackendServiceIamBindingArgs;
import com.pulumi.gcp.iap.inputs.WebRegionBackendServiceIamBindingConditionArgs;
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 WebRegionBackendServiceIamBinding("binding", WebRegionBackendServiceIamBindingArgs.builder()
            .project(default_.project())
            .region(default_.region())
            .webRegionBackendService(default_.name())
            .role("roles/iap.httpsResourceAccessor")
            .members("user:jane@example.com")
            .condition(WebRegionBackendServiceIamBindingConditionArgs.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:
  binding:
    type: gcp:iap:WebRegionBackendServiceIamBinding
    properties:
      project: ${default.project}
      region: ${default.region}
      webRegionBackendService: ${default.name}
      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")

The condition block adds temporal constraints to the role binding. The expression property uses CEL (Common Expression Language) to define when access is valid; here, access expires at midnight on 2020-01-01. The title and description provide human-readable context. IAM evaluates the condition on every request, automatically denying access once the timestamp passes.

Add a single member to an existing role

When onboarding individual users or service accounts, teams add them one at a time without affecting other members.

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

const member = new gcp.iap.WebRegionBackendServiceIamMember("member", {
    project: _default.project,
    region: _default.region,
    webRegionBackendService: _default.name,
    role: "roles/iap.httpsResourceAccessor",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.iap.WebRegionBackendServiceIamMember("member",
    project=default["project"],
    region=default["region"],
    web_region_backend_service=default["name"],
    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.NewWebRegionBackendServiceIamMember(ctx, "member", &iap.WebRegionBackendServiceIamMemberArgs{
			Project:                 pulumi.Any(_default.Project),
			Region:                  pulumi.Any(_default.Region),
			WebRegionBackendService: pulumi.Any(_default.Name),
			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.WebRegionBackendServiceIamMember("member", new()
    {
        Project = @default.Project,
        Region = @default.Region,
        WebRegionBackendService = @default.Name,
        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.WebRegionBackendServiceIamMember;
import com.pulumi.gcp.iap.WebRegionBackendServiceIamMemberArgs;
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 WebRegionBackendServiceIamMember("member", WebRegionBackendServiceIamMemberArgs.builder()
            .project(default_.project())
            .region(default_.region())
            .webRegionBackendService(default_.name())
            .role("roles/iap.httpsResourceAccessor")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:iap:WebRegionBackendServiceIamMember
    properties:
      project: ${default.project}
      region: ${default.region}
      webRegionBackendService: ${default.name}
      role: roles/iap.httpsResourceAccessor
      member: user:jane@example.com

The member property specifies a single identity to grant access. Unlike the binding resource, this member resource is non-authoritative: it adds one identity to the role without removing others. Use this when you need to grant access incrementally without managing the full member list.

Beyond these examples

These snippets focus on specific IAM binding features: role bindings for multiple members, single-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 IAP-protected regional backend services, and GCP projects and regions. They focus on configuring IAM bindings rather than provisioning the underlying backend services.

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

Full policy replacement (IamPolicy resource)
Condition expressions for attribute-based access
Service account and group management
Backend service creation and configuration

These omissions are intentional: the goal is to illustrate how each IAM binding feature is wired, not provide drop-in access control modules. See the WebRegionBackendServiceIamBinding 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 Identity-Aware Proxy permissions?

Choose based on your control needs: gcp.iap.WebRegionBackendServiceIamPolicy for full authoritative control (replaces entire policy), gcp.iap.WebRegionBackendServiceIamBinding for authoritative control per role (preserves other roles), or gcp.iap.WebRegionBackendServiceIamMember for non-authoritative member additions (preserves other members for the role).

Can I use IamPolicy together with IamBinding or IamMember?

No, gcp.iap.WebRegionBackendServiceIamPolicy cannot be used with gcp.iap.WebRegionBackendServiceIamBinding or gcp.iap.WebRegionBackendServiceIamMember as they will conflict over policy control.

Can I use IamBinding and IamMember together?

Yes, but only if they don’t grant privileges to the same role. Each role must be managed by either gcp.iap.WebRegionBackendServiceIamBinding or gcp.iap.WebRegionBackendServiceIamMember, not both.

Configuration & Identity Management

What member identity formats are supported?

The members property supports multiple formats: allUsers, allAuthenticatedUsers, user:{email}, serviceAccount:{email}, group:{email}, domain:{domain}, projectOwner:{projectid}, projectEditor:{projectid}, projectViewer:{projectid}, and federated identities like principal://iam.googleapis.com/....

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.

Advanced Features & Constraints

Can I use IAM Conditions with this resource?

Yes, set the condition property with title, description, and expression fields. Note that IAM Conditions have some known limitations documented in the GCP IAM Conditions overview.

What properties can't be changed after creation?

The role, project, region, webRegionBackendService, and condition properties are immutable and cannot be changed after the resource is created.

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