Configure GCP Identity-Aware Proxy IAM Policies

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

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

Set complete IAM policy with WebIamPolicy

When you need full control over who can access your IAP-protected web resources, WebIamPolicy replaces the entire IAM policy with your specified 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.WebIamPolicy("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.WebIamPolicy("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.NewWebIamPolicy(ctx, "policy", &iap.WebIamPolicyArgs{
			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.WebIamPolicy("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.WebIamPolicy;
import com.pulumi.gcp.iap.WebIamPolicyArgs;
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 WebIamPolicy("policy", WebIamPolicyArgs.builder()
            .project(projectService.project())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:iap:WebIamPolicy
    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 the getIAMPolicy data source, which constructs the policy from bindings. Each binding maps a role to a list of members. WebIamPolicy is authoritative: it replaces any existing policy, removing grants not specified in your configuration. This resource cannot be used alongside WebIamBinding or WebIamMember, as they would conflict over policy ownership.

Grant a role to multiple members with WebIamBinding

Teams managing access for groups or multiple users often need to grant a specific role while preserving other role assignments in the policy.

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

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

import pulumi
import pulumi_gcp as gcp

binding = gcp.iap.WebIamBinding("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.NewWebIamBinding(ctx, "binding", &iap.WebIamBindingArgs{
			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.WebIamBinding("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.WebIamBinding;
import com.pulumi.gcp.iap.WebIamBindingArgs;
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 WebIamBinding("binding", WebIamBindingArgs.builder()
            .project(projectService.project())
            .role("roles/iap.httpsResourceAccessor")
            .members("user:jane@example.com")
            .build());

    }
}

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

WebIamBinding is authoritative for a single role. The members property lists all identities that should have the specified role. Other roles in the IAM policy remain unchanged. You can use multiple WebIamBinding resources for different roles, or combine WebIamBinding with WebIamMember as long as they don’t grant the same role.

Add individual members with WebIamMember

When onboarding new users or service accounts, you often need to grant access without modifying existing member lists for the same role.

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

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

import pulumi
import pulumi_gcp as gcp

member = gcp.iap.WebIamMember("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.NewWebIamMember(ctx, "member", &iap.WebIamMemberArgs{
			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.WebIamMember("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.WebIamMember;
import com.pulumi.gcp.iap.WebIamMemberArgs;
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 WebIamMember("member", WebIamMemberArgs.builder()
            .project(projectService.project())
            .role("roles/iap.httpsResourceAccessor")
            .member("user:jane@example.com")
            .build());

    }
}

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

WebIamMember is non-authoritative: it adds a single member to a role without affecting other members who already have that role. The member property specifies one identity (user, service account, or group). This approach works well when multiple teams manage access independently, as each can add members without coordinating changes to a shared member list.

Apply time-based access with IAM Conditions

Temporary access grants, such as contractor access or time-limited testing, require policies that automatically expire without manual cleanup.

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.WebIamPolicy("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.WebIamPolicy("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.NewWebIamPolicy(ctx, "policy", &iap.WebIamPolicyArgs{
			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.WebIamPolicy("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.WebIamPolicy;
import com.pulumi.gcp.iap.WebIamPolicyArgs;
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 WebIamPolicy("policy", WebIamPolicyArgs.builder()
            .project(projectService.project())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:iap:WebIamPolicy
    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")

IAM Conditions add temporal or attribute-based constraints to policy bindings. The condition block requires a title, optional description, and an expression in Common Expression Language (CEL). Here, the expression compares request.time against a timestamp, automatically denying access after the specified date. Conditions work with all three resource types (WebIamPolicy, WebIamBinding, WebIamMember) but have known limitations documented in the GCP IAM Conditions overview.

Beyond these examples

These snippets focus on specific IAM policy features: authoritative vs non-authoritative policy management and IAM Conditions for time-based access. 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 web resources. They focus on configuring access policies rather than provisioning IAP itself.

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

Service account and group member types (serviceAccount:, group:)
Domain-wide access grants (domain:)
Complex condition expressions (attribute-based access)
Policy conflict resolution between resource types

These omissions are intentional: the goal is to illustrate how each policy management approach is wired, not provide drop-in access control modules. See the IAP WebIamPolicy 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

What's the difference between WebIamPolicy, WebIamBinding, and WebIamMember?

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

Can I use WebIamPolicy with WebIamBinding or WebIamMember?

No, WebIamPolicy cannot be used with WebIamBinding or WebIamMember because they will conflict over the policy configuration.

Can I use WebIamBinding and WebIamMember together?

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

IAM Conditions

How do I add time-based or conditional access to my IAM policy?

Add a condition block with title, description, and expression fields to your resource. For example, use expression: "request.time < timestamp(\"2020-01-01T00:00:00Z\")" for time-based expiration.

Are there any limitations with IAM Conditions?

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

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 iam guides for other cloud providers:

AWS Guides Azure Guides