Configure GCP Identity-Aware Proxy IAM Bindings

The gcp:iap/webCloudRunServiceIamBinding:WebCloudRunServiceIamBinding resource, part of the Pulumi GCP provider, manages IAM role bindings for Identity-Aware Proxy (IAP) protected Cloud Run services. This guide focuses on three capabilities: authoritative role bindings for multiple members, non-authoritative single-member grants, and time-based access with IAM Conditions.

IAM bindings reference existing Cloud Run services and require IAP to be enabled on the project. The examples are intentionally small. Combine them with your own Cloud Run services and identity management workflows.

Grant a role to multiple members at once

Teams managing IAP access often need to authorize multiple users or service accounts simultaneously, ensuring consistent access across a team.

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

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

import pulumi
import pulumi_gcp as gcp

binding = gcp.iap.WebCloudRunServiceIamBinding("binding",
    project=default["project"],
    location=default["location"],
    cloud_run_service_name=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.NewWebCloudRunServiceIamBinding(ctx, "binding", &iap.WebCloudRunServiceIamBindingArgs{
			Project:             pulumi.Any(_default.Project),
			Location:            pulumi.Any(_default.Location),
			CloudRunServiceName: 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.WebCloudRunServiceIamBinding("binding", new()
    {
        Project = @default.Project,
        Location = @default.Location,
        CloudRunServiceName = @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.WebCloudRunServiceIamBinding;
import com.pulumi.gcp.iap.WebCloudRunServiceIamBindingArgs;
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 WebCloudRunServiceIamBinding("binding", WebCloudRunServiceIamBindingArgs.builder()
            .project(default_.project())
            .location(default_.location())
            .cloudRunServiceName(default_.name())
            .role("roles/iap.httpsResourceAccessor")
            .members("user:jane@example.com")
            .build());

    }
}

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

The WebCloudRunServiceIamBinding resource is authoritative for the specified role: it replaces any existing members for that role. The members array accepts various identity formats including users, service accounts, groups, and special identifiers like allAuthenticatedUsers. The cloudRunServiceName identifies which Cloud Run service to protect.

Add a single member to an existing role

When onboarding individual users, teams use non-authoritative member resources to add identities without affecting others already granted the same role.

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

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

import pulumi
import pulumi_gcp as gcp

member = gcp.iap.WebCloudRunServiceIamMember("member",
    project=default["project"],
    location=default["location"],
    cloud_run_service_name=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.NewWebCloudRunServiceIamMember(ctx, "member", &iap.WebCloudRunServiceIamMemberArgs{
			Project:             pulumi.Any(_default.Project),
			Location:            pulumi.Any(_default.Location),
			CloudRunServiceName: 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.WebCloudRunServiceIamMember("member", new()
    {
        Project = @default.Project,
        Location = @default.Location,
        CloudRunServiceName = @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.WebCloudRunServiceIamMember;
import com.pulumi.gcp.iap.WebCloudRunServiceIamMemberArgs;
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 WebCloudRunServiceIamMember("member", WebCloudRunServiceIamMemberArgs.builder()
            .project(default_.project())
            .location(default_.location())
            .cloudRunServiceName(default_.name())
            .role("roles/iap.httpsResourceAccessor")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:iap:WebCloudRunServiceIamMember
    properties:
      project: ${default.project}
      location: ${default.location}
      cloudRunServiceName: ${default.name}
      role: roles/iap.httpsResourceAccessor
      member: user:jane@example.com

The WebCloudRunServiceIamMember resource adds a single identity to a role without replacing existing members. This is useful for incremental access grants where you don’t want to manage the complete member list. Use member (singular) instead of members (plural) to specify one identity.

Apply time-based access with IAM Conditions

Organizations with temporary contractors or time-limited projects use IAM Conditions to automatically expire access.

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

const binding = new gcp.iap.WebCloudRunServiceIamBinding("binding", {
    project: _default.project,
    location: _default.location,
    cloudRunServiceName: _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.WebCloudRunServiceIamBinding("binding",
    project=default["project"],
    location=default["location"],
    cloud_run_service_name=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.NewWebCloudRunServiceIamBinding(ctx, "binding", &iap.WebCloudRunServiceIamBindingArgs{
			Project:             pulumi.Any(_default.Project),
			Location:            pulumi.Any(_default.Location),
			CloudRunServiceName: pulumi.Any(_default.Name),
			Role:                pulumi.String("roles/iap.httpsResourceAccessor"),
			Members: pulumi.StringArray{
				pulumi.String("user:jane@example.com"),
			},
			Condition: &iap.WebCloudRunServiceIamBindingConditionArgs{
				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.WebCloudRunServiceIamBinding("binding", new()
    {
        Project = @default.Project,
        Location = @default.Location,
        CloudRunServiceName = @default.Name,
        Role = "roles/iap.httpsResourceAccessor",
        Members = new[]
        {
            "user:jane@example.com",
        },
        Condition = new Gcp.Iap.Inputs.WebCloudRunServiceIamBindingConditionArgs
        {
            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.WebCloudRunServiceIamBinding;
import com.pulumi.gcp.iap.WebCloudRunServiceIamBindingArgs;
import com.pulumi.gcp.iap.inputs.WebCloudRunServiceIamBindingConditionArgs;
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 WebCloudRunServiceIamBinding("binding", WebCloudRunServiceIamBindingArgs.builder()
            .project(default_.project())
            .location(default_.location())
            .cloudRunServiceName(default_.name())
            .role("roles/iap.httpsResourceAccessor")
            .members("user:jane@example.com")
            .condition(WebCloudRunServiceIamBindingConditionArgs.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:WebCloudRunServiceIamBinding
    properties:
      project: ${default.project}
      location: ${default.location}
      cloudRunServiceName: ${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 role grants. The expression uses CEL (Common Expression Language) to define when access is valid; here, access expires at midnight on 2020-01-01. The title identifies the condition in audit logs and the GCP console. IAM Conditions work with both binding and member resources.

Beyond these examples

These snippets focus on specific IAM binding features: role-based access control (binding vs member resources) and IAM Conditions for time-based access. They’re intentionally minimal rather than complete access control configurations.

The examples reference pre-existing infrastructure such as Cloud Run services and a GCP project with IAP enabled. They focus on configuring IAM bindings rather than provisioning the underlying services.

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

Policy resource (authoritative full policy replacement)
Condition expressions beyond time-based (attribute-based, resource-based)
Custom role definitions
Federated identity and workload identity pool 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 WebCloudRunServiceIamBinding resource reference for all available configuration options.

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Frequently Asked Questions

Resource Selection & Conflicts

What's the difference between Policy, Binding, and Member resources for IAP?

Three resources manage IAM policies with different behaviors: gcp.iap.WebCloudRunServiceIamPolicy is authoritative and replaces the entire policy, gcp.iap.WebCloudRunServiceIamBinding is authoritative for a specific role (preserves other roles), and gcp.iap.WebCloudRunServiceIamMember is non-authoritative (adds individual members without affecting others).

Can I use Policy with Binding or Member resources?

No, gcp.iap.WebCloudRunServiceIamPolicy cannot be used with gcp.iap.WebCloudRunServiceIamBinding or gcp.iap.WebCloudRunServiceIamMember because they will conflict over policy management.

Can I use Binding and Member resources together?

Yes, but only if they manage different roles. gcp.iap.WebCloudRunServiceIamBinding and gcp.iap.WebCloudRunServiceIamMember will conflict if they grant privileges to the same role.

Configuration & Identity Management

What identity formats can I use in the members list?

You can use allUsers, allAuthenticatedUsers, user:{email}, serviceAccount:{email}, group:{email}, domain:{domain}, projectOwner/Editor/Viewer:{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/customRole.

What happens if I don't specify the location parameter?

The location will be parsed from the parent resource identifier. If no location is provided there, it’s taken from the provider configuration.

IAM Conditions & Advanced Features

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

Use the condition property with title, description, and expression fields. For example, to expire access: expression: "request.time < timestamp(\"2020-01-01T00:00:00Z\")". Note that IAM Conditions have known limitations.

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.

Immutability & Lifecycle

Which properties can't be changed after creation?

The cloudRunServiceName, location, role, and condition properties are all immutable and require resource replacement if changed.

What's the computed etag property used for?

The etag is a computed output property representing the IAM policy version, useful for detecting concurrent modifications.

Using a different cloud?

Explore security guides for other cloud providers:

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