Configure GCP Workload Identity Pool IAM Policies

The gcp:iam/workloadIdentityPoolIamPolicy:WorkloadIdentityPoolIamPolicy resource, part of the Pulumi GCP provider, manages IAM policies for Workload Identity Pools, controlling which identities can access the pool. This guide focuses on four capabilities: authoritative policy replacement, role-based bindings, non-authoritative member grants, and time-based IAM Conditions.

All examples reference an existing Workload Identity Pool and require appropriate IAM permissions in the GCP project. The examples are intentionally small. Combine them with your own pool configuration and organizational access patterns.

Replace the entire IAM policy for a pool

When you need complete control over pool access, you can set the entire IAM policy at once, replacing any existing permissions.

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

const admin = gcp.organizations.getIAMPolicy({
    bindings: [{
        role: "roles/iam.workloadIdentityPoolViewer",
        members: ["user:jane@example.com"],
    }],
});
const policy = new gcp.iam.WorkloadIdentityPoolIamPolicy("policy", {
    project: example.project,
    workloadIdentityPoolId: example.workloadIdentityPoolId,
    policyData: admin.then(admin => admin.policyData),
});

import pulumi
import pulumi_gcp as gcp

admin = gcp.organizations.get_iam_policy(bindings=[{
    "role": "roles/iam.workloadIdentityPoolViewer",
    "members": ["user:jane@example.com"],
}])
policy = gcp.iam.WorkloadIdentityPoolIamPolicy("policy",
    project=example["project"],
    workload_identity_pool_id=example["workloadIdentityPoolId"],
    policy_data=admin.policy_data)

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/iam"
	"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/iam.workloadIdentityPoolViewer",
					Members: []string{
						"user:jane@example.com",
					},
				},
			},
		}, nil)
		if err != nil {
			return err
		}
		_, err = iam.NewWorkloadIdentityPoolIamPolicy(ctx, "policy", &iam.WorkloadIdentityPoolIamPolicyArgs{
			Project:                pulumi.Any(example.Project),
			WorkloadIdentityPoolId: pulumi.Any(example.WorkloadIdentityPoolId),
			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/iam.workloadIdentityPoolViewer",
                Members = new[]
                {
                    "user:jane@example.com",
                },
            },
        },
    });

    var policy = new Gcp.Iam.WorkloadIdentityPoolIamPolicy("policy", new()
    {
        Project = example.Project,
        WorkloadIdentityPoolId = example.WorkloadIdentityPoolId,
        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.iam.WorkloadIdentityPoolIamPolicy;
import com.pulumi.gcp.iam.WorkloadIdentityPoolIamPolicyArgs;
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/iam.workloadIdentityPoolViewer")
                .members("user:jane@example.com")
                .build())
            .build());

        var policy = new WorkloadIdentityPoolIamPolicy("policy", WorkloadIdentityPoolIamPolicyArgs.builder()
            .project(example.project())
            .workloadIdentityPoolId(example.workloadIdentityPoolId())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:iam:WorkloadIdentityPoolIamPolicy
    properties:
      project: ${example.project}
      workloadIdentityPoolId: ${example.workloadIdentityPoolId}
      policyData: ${admin.policyData}
variables:
  admin:
    fn::invoke:
      function: gcp:organizations:getIAMPolicy
      arguments:
        bindings:
          - role: roles/iam.workloadIdentityPoolViewer
            members:
              - user:jane@example.com

The WorkloadIdentityPoolIamPolicy resource is authoritative: it replaces the pool’s entire IAM policy with the policyData you provide. The getIAMPolicy data source generates the policy document from bindings you define. This approach gives you full control but cannot be used alongside Binding or Member resources for the same pool.

Grant a role to multiple members at once

Teams often need to grant the same role to several users or service accounts without managing each permission individually.

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

const binding = new gcp.iam.WorkloadIdentityPoolIamBinding("binding", {
    project: example.project,
    workloadIdentityPoolId: example.workloadIdentityPoolId,
    role: "roles/iam.workloadIdentityPoolViewer",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.iam.WorkloadIdentityPoolIamBinding("binding",
    project=example["project"],
    workload_identity_pool_id=example["workloadIdentityPoolId"],
    role="roles/iam.workloadIdentityPoolViewer",
    members=["user:jane@example.com"])

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := iam.NewWorkloadIdentityPoolIamBinding(ctx, "binding", &iam.WorkloadIdentityPoolIamBindingArgs{
			Project:                pulumi.Any(example.Project),
			WorkloadIdentityPoolId: pulumi.Any(example.WorkloadIdentityPoolId),
			Role:                   pulumi.String("roles/iam.workloadIdentityPoolViewer"),
			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.Iam.WorkloadIdentityPoolIamBinding("binding", new()
    {
        Project = example.Project,
        WorkloadIdentityPoolId = example.WorkloadIdentityPoolId,
        Role = "roles/iam.workloadIdentityPoolViewer",
        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.iam.WorkloadIdentityPoolIamBinding;
import com.pulumi.gcp.iam.WorkloadIdentityPoolIamBindingArgs;
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 WorkloadIdentityPoolIamBinding("binding", WorkloadIdentityPoolIamBindingArgs.builder()
            .project(example.project())
            .workloadIdentityPoolId(example.workloadIdentityPoolId())
            .role("roles/iam.workloadIdentityPoolViewer")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:iam:WorkloadIdentityPoolIamBinding
    properties:
      project: ${example.project}
      workloadIdentityPoolId: ${example.workloadIdentityPoolId}
      role: roles/iam.workloadIdentityPoolViewer
      members:
        - user:jane@example.com

The WorkloadIdentityPoolIamBinding resource is authoritative for a single role: it sets the complete member list for that role while preserving other roles in the pool’s policy. The members array accepts user accounts, service accounts, groups, and domains. You can combine multiple Binding resources for different roles on the same pool.

Add a single member to a role

When you need to grant access to one additional user without affecting existing permissions, non-authoritative member resources let you add permissions incrementally.

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

const member = new gcp.iam.WorkloadIdentityPoolIamMember("member", {
    project: example.project,
    workloadIdentityPoolId: example.workloadIdentityPoolId,
    role: "roles/iam.workloadIdentityPoolViewer",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.iam.WorkloadIdentityPoolIamMember("member",
    project=example["project"],
    workload_identity_pool_id=example["workloadIdentityPoolId"],
    role="roles/iam.workloadIdentityPoolViewer",
    member="user:jane@example.com")

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := iam.NewWorkloadIdentityPoolIamMember(ctx, "member", &iam.WorkloadIdentityPoolIamMemberArgs{
			Project:                pulumi.Any(example.Project),
			WorkloadIdentityPoolId: pulumi.Any(example.WorkloadIdentityPoolId),
			Role:                   pulumi.String("roles/iam.workloadIdentityPoolViewer"),
			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.Iam.WorkloadIdentityPoolIamMember("member", new()
    {
        Project = example.Project,
        WorkloadIdentityPoolId = example.WorkloadIdentityPoolId,
        Role = "roles/iam.workloadIdentityPoolViewer",
        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.iam.WorkloadIdentityPoolIamMember;
import com.pulumi.gcp.iam.WorkloadIdentityPoolIamMemberArgs;
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 WorkloadIdentityPoolIamMember("member", WorkloadIdentityPoolIamMemberArgs.builder()
            .project(example.project())
            .workloadIdentityPoolId(example.workloadIdentityPoolId())
            .role("roles/iam.workloadIdentityPoolViewer")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:iam:WorkloadIdentityPoolIamMember
    properties:
      project: ${example.project}
      workloadIdentityPoolId: ${example.workloadIdentityPoolId}
      role: roles/iam.workloadIdentityPoolViewer
      member: user:jane@example.com

The WorkloadIdentityPoolIamMember resource is non-authoritative: it adds one member 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. Multiple Member resources can target the same role on the same pool.

Apply time-based access with IAM Conditions

Access requirements sometimes include temporal constraints, such as granting permissions that expire after a specific date.

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

const admin = gcp.organizations.getIAMPolicy({
    bindings: [{
        role: "roles/iam.workloadIdentityPoolViewer",
        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.iam.WorkloadIdentityPoolIamPolicy("policy", {
    project: example.project,
    workloadIdentityPoolId: example.workloadIdentityPoolId,
    policyData: admin.then(admin => admin.policyData),
});

import pulumi
import pulumi_gcp as gcp

admin = gcp.organizations.get_iam_policy(bindings=[{
    "role": "roles/iam.workloadIdentityPoolViewer",
    "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.iam.WorkloadIdentityPoolIamPolicy("policy",
    project=example["project"],
    workload_identity_pool_id=example["workloadIdentityPoolId"],
    policy_data=admin.policy_data)

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/iam"
	"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/iam.workloadIdentityPoolViewer",
					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 = iam.NewWorkloadIdentityPoolIamPolicy(ctx, "policy", &iam.WorkloadIdentityPoolIamPolicyArgs{
			Project:                pulumi.Any(example.Project),
			WorkloadIdentityPoolId: pulumi.Any(example.WorkloadIdentityPoolId),
			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/iam.workloadIdentityPoolViewer",
                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.Iam.WorkloadIdentityPoolIamPolicy("policy", new()
    {
        Project = example.Project,
        WorkloadIdentityPoolId = example.WorkloadIdentityPoolId,
        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.iam.WorkloadIdentityPoolIamPolicy;
import com.pulumi.gcp.iam.WorkloadIdentityPoolIamPolicyArgs;
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/iam.workloadIdentityPoolViewer")
                .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 WorkloadIdentityPoolIamPolicy("policy", WorkloadIdentityPoolIamPolicyArgs.builder()
            .project(example.project())
            .workloadIdentityPoolId(example.workloadIdentityPoolId())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:iam:WorkloadIdentityPoolIamPolicy
    properties:
      project: ${example.project}
      workloadIdentityPoolId: ${example.workloadIdentityPoolId}
      policyData: ${admin.policyData}
variables:
  admin:
    fn::invoke:
      function: gcp:organizations:getIAMPolicy
      arguments:
        bindings:
          - role: roles/iam.workloadIdentityPoolViewer
            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 and expression; the expression uses CEL (Common Expression Language) to evaluate request context. Here, the expression checks that the request time is before midnight on January 1, 2020. Note that IAM Conditions 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-based access control, and time-based IAM Conditions. They’re intentionally minimal rather than full access control systems.

The examples reference pre-existing infrastructure such as Workload Identity Pools and GCP projects with IAM permissions. They focus on configuring IAM policies rather than provisioning the pools themselves.

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

  • Combining Policy with Binding/Member resources (causes conflicts)
  • Custom role definitions and management
  • Audit logging configuration
  • IAM Conditions limitations and workarounds

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 Workload Identity Pool IAM Policy resource reference for all available configuration options.

Let's configure GCP Workload Identity Pool IAM Policies

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Frequently Asked Questions

Resource Selection & Conflicts
What's the difference between WorkloadIdentityPoolIamPolicy, IamBinding, and IamMember?
WorkloadIdentityPoolIamPolicy is authoritative and replaces the entire IAM policy. WorkloadIdentityPoolIamBinding is authoritative for a specific role, preserving other roles. WorkloadIdentityPoolIamMember is non-authoritative, adding a single member while preserving existing members for that role.
Can I use WorkloadIdentityPoolIamPolicy with IamBinding or IamMember?
No. WorkloadIdentityPoolIamPolicy cannot be used with WorkloadIdentityPoolIamBinding or WorkloadIdentityPoolIamMember because they’ll conflict over the policy state.
Can I use WorkloadIdentityPoolIamBinding with IamMember?
Yes, but only if they don’t grant privileges to the same role. Using both for the same role causes conflicts.
IAM Conditions & Features
Can I use IAM Conditions with this resource?
Yes. Add a condition block with title, description, and expression fields. Note that IAM Conditions have known limitations documented by Google Cloud.
Is this resource production-ready?
This resource is in beta and requires the terraform-provider-google-beta provider.
Configuration & Properties
What properties can't be changed after creation?
Both project and workloadIdentityPoolId are immutable and cannot be modified after resource creation.

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