Manage GCP Endpoints Service IAM Permissions

The gcp:endpoints/serviceIamMember:ServiceIamMember resource, part of the Pulumi GCP provider, grants IAM roles to individual members on Cloud Endpoints services without affecting other members of the same role. This guide focuses on three capabilities: single-member grants, multi-member bindings, and full policy replacement.

Three related resources manage Cloud Endpoints IAM: ServiceIamMember (non-authoritative, adds one member), ServiceIamBinding (authoritative for a role, manages all members), and ServiceIamPolicy (authoritative for all roles, replaces entire policy). ServiceIamPolicy cannot be used with the other two, or they will conflict. The examples are intentionally small. Choose the resource that matches your management approach.

Grant a role to a single member

Most IAM configurations add one user or service account to a role, preserving existing assignments.

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

const member = new gcp.endpoints.ServiceIamMember("member", {
    serviceName: endpointsService.serviceName,
    role: "roles/viewer",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.endpoints.ServiceIamMember("member",
    service_name=endpoints_service["serviceName"],
    role="roles/viewer",
    member="user:jane@example.com")

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/endpoints"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := endpoints.NewServiceIamMember(ctx, "member", &endpoints.ServiceIamMemberArgs{
			ServiceName: pulumi.Any(endpointsService.ServiceName),
			Role:        pulumi.String("roles/viewer"),
			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.Endpoints.ServiceIamMember("member", new()
    {
        ServiceName = endpointsService.ServiceName,
        Role = "roles/viewer",
        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.endpoints.ServiceIamMember;
import com.pulumi.gcp.endpoints.ServiceIamMemberArgs;
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 ServiceIamMember("member", ServiceIamMemberArgs.builder()
            .serviceName(endpointsService.serviceName())
            .role("roles/viewer")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:endpoints:ServiceIamMember
    properties:
      serviceName: ${endpointsService.serviceName}
      role: roles/viewer
      member: user:jane@example.com

The member property identifies who receives access using formats like “user:jane@example.com” or “serviceAccount:app@project.iam.gserviceaccount.com”. The role property specifies the permission set to grant. This resource is non-authoritative: it adds the member without removing others already assigned to the role.

Grant a role to multiple members at once

When several users or service accounts need identical permissions, binding them together ensures consistent access.

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

const binding = new gcp.endpoints.ServiceIamBinding("binding", {
    serviceName: endpointsService.serviceName,
    role: "roles/viewer",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.endpoints.ServiceIamBinding("binding",
    service_name=endpoints_service["serviceName"],
    role="roles/viewer",
    members=["user:jane@example.com"])

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/endpoints"
	"github.com/pulumi/pulumi/sdk/v3/go/pulumi"
)

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := endpoints.NewServiceIamBinding(ctx, "binding", &endpoints.ServiceIamBindingArgs{
			ServiceName: pulumi.Any(endpointsService.ServiceName),
			Role:        pulumi.String("roles/viewer"),
			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.Endpoints.ServiceIamBinding("binding", new()
    {
        ServiceName = endpointsService.ServiceName,
        Role = "roles/viewer",
        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.endpoints.ServiceIamBinding;
import com.pulumi.gcp.endpoints.ServiceIamBindingArgs;
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 ServiceIamBinding("binding", ServiceIamBindingArgs.builder()
            .serviceName(endpointsService.serviceName())
            .role("roles/viewer")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:endpoints:ServiceIamBinding
    properties:
      serviceName: ${endpointsService.serviceName}
      role: roles/viewer
      members:
        - user:jane@example.com

The members property accepts a list of identifiers, granting the role to all of them in one operation. This resource is authoritative for the specified role: it replaces all members for that role while preserving other roles in the policy. Use this when you want to manage all members of a role together.

Replace the entire IAM policy

Some deployments require complete control over all IAM bindings, replacing any existing policy.

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

const admin = gcp.organizations.getIAMPolicy({
    bindings: [{
        role: "roles/viewer",
        members: ["user:jane@example.com"],
    }],
});
const policy = new gcp.endpoints.ServiceIamPolicy("policy", {
    serviceName: endpointsService.serviceName,
    policyData: admin.then(admin => admin.policyData),
});

import pulumi
import pulumi_gcp as gcp

admin = gcp.organizations.get_iam_policy(bindings=[{
    "role": "roles/viewer",
    "members": ["user:jane@example.com"],
}])
policy = gcp.endpoints.ServiceIamPolicy("policy",
    service_name=endpoints_service["serviceName"],
    policy_data=admin.policy_data)

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/endpoints"
	"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/viewer",
					Members: []string{
						"user:jane@example.com",
					},
				},
			},
		}, nil)
		if err != nil {
			return err
		}
		_, err = endpoints.NewServiceIamPolicy(ctx, "policy", &endpoints.ServiceIamPolicyArgs{
			ServiceName: pulumi.Any(endpointsService.ServiceName),
			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/viewer",
                Members = new[]
                {
                    "user:jane@example.com",
                },
            },
        },
    });

    var policy = new Gcp.Endpoints.ServiceIamPolicy("policy", new()
    {
        ServiceName = endpointsService.ServiceName,
        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.endpoints.ServiceIamPolicy;
import com.pulumi.gcp.endpoints.ServiceIamPolicyArgs;
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/viewer")
                .members("user:jane@example.com")
                .build())
            .build());

        var policy = new ServiceIamPolicy("policy", ServiceIamPolicyArgs.builder()
            .serviceName(endpointsService.serviceName())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:endpoints:ServiceIamPolicy
    properties:
      serviceName: ${endpointsService.serviceName}
      policyData: ${admin.policyData}
variables:
  admin:
    fn::invoke:
      function: gcp:organizations:getIAMPolicy
      arguments:
        bindings:
          - role: roles/viewer
            members:
              - user:jane@example.com

The policyData property accepts a complete IAM policy document, typically retrieved from getIAMPolicy. This resource is fully authoritative: it replaces the entire IAM policy for the service. You cannot use ServiceIamPolicy alongside ServiceIamBinding or ServiceIamMember, as they will conflict over policy ownership.

Beyond these examples

These snippets focus on specific IAM management approaches: single-member grants, multi-member role bindings, and full policy replacement. They’re intentionally minimal rather than complete access control configurations.

The examples reference pre-existing infrastructure such as Cloud Endpoints services (serviceName references). They focus on IAM role assignment rather than service provisioning.

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

Conditional IAM bindings (condition property)
Custom role definitions and formatting
Federated identity and workload identity pool configuration
Resource conflict management between Policy, Binding, and Member resources

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 Cloud Endpoints ServiceIamMember resource reference for all available configuration options.

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Frequently Asked Questions

Resource Compatibility & Conflicts

Can I use ServiceIamPolicy with other IAM resources?

No, gcp.endpoints.ServiceIamPolicy cannot be used with gcp.endpoints.ServiceIamBinding or gcp.endpoints.ServiceIamMember as they will conflict over policy management.

Can I use ServiceIamBinding and ServiceIamMember together?

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

Resource Selection

What's the difference between ServiceIamPolicy, ServiceIamBinding, and ServiceIamMember?

ServiceIamPolicy is authoritative and replaces the entire IAM policy. ServiceIamBinding is authoritative for a specific role, managing all members for that role while preserving other roles. ServiceIamMember is non-authoritative, adding a single member to a role without affecting other members.

Which IAM resource should I use?

Use ServiceIamPolicy for complete policy control, ServiceIamBinding to manage all members for a specific role, or ServiceIamMember to add individual members without affecting existing grants.

Configuration & Identity Types

What identity formats can I use for the member field?

The member field supports multiple formats:

allUsers or allAuthenticatedUsers for public/authenticated access
user:{email}, serviceAccount:{email}, group:{email} for specific identities
domain:{domain} for G Suite domains
projectOwner:{projectid}, projectEditor:{projectid}, projectViewer:{projectid} for project roles
Federated identities using principal:// format

What format do custom roles require?

Custom roles must use the full name format: [projects|organizations]/{parent-name}/roles/{role-name}. For example, projects/my-project/roles/my-custom-role.

Immutability & Limitations

Can I change the member, role, or serviceName after creation?

No, the member, role, serviceName, and condition fields are all immutable and require resource replacement if changed.

Using a different cloud?

Explore iam guides for other cloud providers:

AWS Guides Azure Guides