Configure GCP Identity-Aware Proxy IAM Policies

The gcp:iap/webTypeComputeIamPolicy:WebTypeComputeIamPolicy resource, part of the Pulumi GCP provider, manages IAM policies for Identity-Aware Proxy compute resources, controlling who can access IAP-protected applications. This guide focuses on four capabilities: authoritative policy replacement, role-level binding, individual member grants, and time-based access with IAM Conditions.

These resources manage access to IAP-protected compute resources in an existing GCP project. The examples are intentionally small. Combine them with your own project configuration and IAP setup.

Replace the entire IAM policy with a new definition

When you need complete control over who can access IAP-protected compute resources, WebTypeComputeIamPolicy replaces the entire IAM policy in one operation.

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.WebTypeComputeIamPolicy("policy", {
    project: projectService.project,
    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.WebTypeComputeIamPolicy("policy",
    project=project_service["project"],
    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.NewWebTypeComputeIamPolicy(ctx, "policy", &iap.WebTypeComputeIamPolicyArgs{
			Project:    pulumi.Any(projectService.Project),
			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.WebTypeComputeIamPolicy("policy", new()
    {
        Project = projectService.Project,
        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.WebTypeComputeIamPolicy;
import com.pulumi.gcp.iap.WebTypeComputeIamPolicyArgs;
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 WebTypeComputeIamPolicy("policy", WebTypeComputeIamPolicyArgs.builder()
            .project(projectService.project())
            .policyData(admin.policyData())
            .build());

    }
}

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

The policyData property accepts output from getIAMPolicy, which defines bindings between roles and members. WebTypeComputeIamPolicy is authoritative: it replaces the entire policy, removing any bindings not specified. This approach ensures the policy matches your definition exactly but cannot be used alongside WebTypeComputeIamBinding or WebTypeComputeIamMember.

Grant a role to multiple members at once

Teams managing access for groups or multiple users often need to grant the same role to several members simultaneously while preserving other role assignments.

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

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

import pulumi
import pulumi_gcp as gcp

binding = gcp.iap.WebTypeComputeIamBinding("binding",
    project=project_service["project"],
    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.NewWebTypeComputeIamBinding(ctx, "binding", &iap.WebTypeComputeIamBindingArgs{
			Project: pulumi.Any(projectService.Project),
			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.WebTypeComputeIamBinding("binding", new()
    {
        Project = projectService.Project,
        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.WebTypeComputeIamBinding;
import com.pulumi.gcp.iap.WebTypeComputeIamBindingArgs;
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 WebTypeComputeIamBinding("binding", WebTypeComputeIamBindingArgs.builder()
            .project(projectService.project())
            .role("roles/iap.httpsResourceAccessor")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:iap:WebTypeComputeIamBinding
    properties:
      project: ${projectService.project}
      role: roles/iap.httpsResourceAccessor
      members:
        - user:jane@example.com

The members property lists all identities that receive the specified role. WebTypeComputeIamBinding is authoritative for the role: it replaces all members for that role but preserves other roles in the policy. You can combine multiple Binding resources for different roles, but never use Binding and Member for the same role.

Add a single member to a role incrementally

When onboarding individual users or service accounts, you often want to grant access without modifying existing members or other role bindings.

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

const member = new gcp.iap.WebTypeComputeIamMember("member", {
    project: projectService.project,
    role: "roles/iap.httpsResourceAccessor",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.iap.WebTypeComputeIamMember("member",
    project=project_service["project"],
    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.NewWebTypeComputeIamMember(ctx, "member", &iap.WebTypeComputeIamMemberArgs{
			Project: pulumi.Any(projectService.Project),
			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.WebTypeComputeIamMember("member", new()
    {
        Project = projectService.Project,
        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.WebTypeComputeIamMember;
import com.pulumi.gcp.iap.WebTypeComputeIamMemberArgs;
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 WebTypeComputeIamMember("member", WebTypeComputeIamMemberArgs.builder()
            .project(projectService.project())
            .role("roles/iap.httpsResourceAccessor")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:iap:WebTypeComputeIamMember
    properties:
      project: ${projectService.project}
      role: roles/iap.httpsResourceAccessor
      member: user:jane@example.com

The member property specifies a single identity to receive the role. WebTypeComputeIamMember is non-authoritative: it adds the member without affecting other members for the same role or other roles in the policy. This approach works well for incremental access grants and can be combined with Binding resources for different roles.

Apply time-based access with IAM Conditions

Temporary access grants, such as contractor access or time-limited testing, require IAM Conditions to automatically expire 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.WebTypeComputeIamPolicy("policy", {
    project: projectService.project,
    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.WebTypeComputeIamPolicy("policy",
    project=project_service["project"],
    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.NewWebTypeComputeIamPolicy(ctx, "policy", &iap.WebTypeComputeIamPolicyArgs{
			Project:    pulumi.Any(projectService.Project),
			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.WebTypeComputeIamPolicy("policy", new()
    {
        Project = projectService.Project,
        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.WebTypeComputeIamPolicy;
import com.pulumi.gcp.iap.WebTypeComputeIamPolicyArgs;
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 WebTypeComputeIamPolicy("policy", WebTypeComputeIamPolicyArgs.builder()
            .project(projectService.project())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:iap:WebTypeComputeIamPolicy
    properties:
      project: ${projectService.project}
      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")

The condition block adds a CEL expression that evaluates at request time. The expression property uses timestamp() to define when access expires. 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 binding and member assignment, and time-based access with IAM Conditions. They’re intentionally minimal rather than full access control configurations.

The examples may reference pre-existing infrastructure such as GCP projects with IAP enabled and IAP-protected compute resources. They focus on configuring IAM policies rather than provisioning IAP itself.

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

Combining Policy with Binding/Member resources (causes conflicts)
Mixing Binding and Member for the same role (causes conflicts)
Custom IAM roles (requires full role path)
IAM Conditions limitations and edge cases

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 WebTypeComputeIamPolicy resource reference for all available configuration options.

Let's configure GCP Identity-Aware Proxy IAM Policies

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Frequently Asked Questions

Resource Selection & Conflicts

Why are my IAM resources conflicting with each other?

gcp.iap.WebTypeComputeIamPolicy cannot be used with gcp.iap.WebTypeComputeIamBinding or gcp.iap.WebTypeComputeIamMember, as they will conflict over policy management. Additionally, WebTypeComputeIamBinding and WebTypeComputeIamMember can only be used together if they target different roles.

What's the difference between WebTypeComputeIamPolicy, Binding, and Member?

WebTypeComputeIamPolicy is authoritative and replaces the entire IAM policy. WebTypeComputeIamBinding is authoritative for a specific role, preserving other roles. WebTypeComputeIamMember is non-authoritative, adding individual members while preserving existing members for that role.

IAM Conditions & Advanced Features

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

Use the condition property with title, description, and expression fields. For example, set expression to request.time < timestamp("2020-01-01T00:00:00Z") to expire access at a specific time.

Are there any limitations when using IAM Conditions?

Yes, IAM Conditions are supported but have known limitations. Review GCP’s IAM Conditions documentation if you encounter issues with conditional access policies.

Configuration & Properties

Can I change the project after creating the IAM policy?

No, the project property is immutable and cannot be changed after resource creation.

Using a different cloud?

Explore security guides for other cloud providers:

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