Manage GCP Cloud Storage Managed Folder IAM Policies

The gcp:storage/managedFolderIamPolicy:ManagedFolderIamPolicy resource, part of the Pulumi GCP provider, controls IAM permissions for Cloud Storage managed folders, determining who can access folder contents and metadata. This guide focuses on three capabilities: authoritative policy replacement, time-bound conditional access, and role binding patterns.

IAM resources for managed folders come in three types: ManagedFolderIamPolicy (replaces entire policy), ManagedFolderIamBinding (authoritative for one role), and ManagedFolderIamMember (adds one member non-authoritatively). The examples are intentionally small. Combine them with your own bucket and folder infrastructure.

Replace the entire IAM policy for a managed folder

When you need complete control over 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/storage.admin",
        members: ["user:jane@example.com"],
    }],
});
const policy = new gcp.storage.ManagedFolderIamPolicy("policy", {
    bucket: folder.bucket,
    managedFolder: folder.name,
    policyData: admin.then(admin => admin.policyData),
});

import pulumi
import pulumi_gcp as gcp

admin = gcp.organizations.get_iam_policy(bindings=[{
    "role": "roles/storage.admin",
    "members": ["user:jane@example.com"],
}])
policy = gcp.storage.ManagedFolderIamPolicy("policy",
    bucket=folder["bucket"],
    managed_folder=folder["name"],
    policy_data=admin.policy_data)

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/organizations"
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/storage"
	"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/storage.admin",
					Members: []string{
						"user:jane@example.com",
					},
				},
			},
		}, nil)
		if err != nil {
			return err
		}
		_, err = storage.NewManagedFolderIamPolicy(ctx, "policy", &storage.ManagedFolderIamPolicyArgs{
			Bucket:        pulumi.Any(folder.Bucket),
			ManagedFolder: pulumi.Any(folder.Name),
			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/storage.admin",
                Members = new[]
                {
                    "user:jane@example.com",
                },
            },
        },
    });

    var policy = new Gcp.Storage.ManagedFolderIamPolicy("policy", new()
    {
        Bucket = folder.Bucket,
        ManagedFolder = folder.Name,
        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.storage.ManagedFolderIamPolicy;
import com.pulumi.gcp.storage.ManagedFolderIamPolicyArgs;
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/storage.admin")
                .members("user:jane@example.com")
                .build())
            .build());

        var policy = new ManagedFolderIamPolicy("policy", ManagedFolderIamPolicyArgs.builder()
            .bucket(folder.bucket())
            .managedFolder(folder.name())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:storage:ManagedFolderIamPolicy
    properties:
      bucket: ${folder.bucket}
      managedFolder: ${folder.name}
      policyData: ${admin.policyData}
variables:
  admin:
    fn::invoke:
      function: gcp:organizations:getIAMPolicy
      arguments:
        bindings:
          - role: roles/storage.admin
            members:
              - user:jane@example.com

The policyData property accepts output from getIAMPolicy, which defines bindings between roles and members. ManagedFolderIamPolicy is authoritative: it replaces the entire policy, removing any permissions not explicitly listed. The bucket and managedFolder properties identify which folder to configure.

Set time-bound permissions with IAM Conditions

Access requirements often change over time. IAM Conditions let you grant permissions that automatically expire at a specific date.

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

const admin = gcp.organizations.getIAMPolicy({
    bindings: [{
        role: "roles/storage.admin",
        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.storage.ManagedFolderIamPolicy("policy", {
    bucket: folder.bucket,
    managedFolder: folder.name,
    policyData: admin.then(admin => admin.policyData),
});

import pulumi
import pulumi_gcp as gcp

admin = gcp.organizations.get_iam_policy(bindings=[{
    "role": "roles/storage.admin",
    "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.storage.ManagedFolderIamPolicy("policy",
    bucket=folder["bucket"],
    managed_folder=folder["name"],
    policy_data=admin.policy_data)

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/organizations"
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/storage"
	"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/storage.admin",
					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 = storage.NewManagedFolderIamPolicy(ctx, "policy", &storage.ManagedFolderIamPolicyArgs{
			Bucket:        pulumi.Any(folder.Bucket),
			ManagedFolder: pulumi.Any(folder.Name),
			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/storage.admin",
                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.Storage.ManagedFolderIamPolicy("policy", new()
    {
        Bucket = folder.Bucket,
        ManagedFolder = folder.Name,
        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.storage.ManagedFolderIamPolicy;
import com.pulumi.gcp.storage.ManagedFolderIamPolicyArgs;
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/storage.admin")
                .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 ManagedFolderIamPolicy("policy", ManagedFolderIamPolicyArgs.builder()
            .bucket(folder.bucket())
            .managedFolder(folder.name())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:storage:ManagedFolderIamPolicy
    properties:
      bucket: ${folder.bucket}
      managedFolder: ${folder.name}
      policyData: ${admin.policyData}
variables:
  admin:
    fn::invoke:
      function: gcp:organizations:getIAMPolicy
      arguments:
        bindings:
          - role: roles/storage.admin
            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 bindings. The expression property uses CEL (Common Expression Language) to define when access is valid. Here, the timestamp comparison grants access until midnight on December 31, 2019. The title and description document the condition’s purpose.

Grant a role to multiple members at once

When multiple users or service accounts need the same level of access, you can bind them all to a single role without affecting other role assignments.

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

const binding = new gcp.storage.ManagedFolderIamBinding("binding", {
    bucket: folder.bucket,
    managedFolder: folder.name,
    role: "roles/storage.admin",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.storage.ManagedFolderIamBinding("binding",
    bucket=folder["bucket"],
    managed_folder=folder["name"],
    role="roles/storage.admin",
    members=["user:jane@example.com"])

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := storage.NewManagedFolderIamBinding(ctx, "binding", &storage.ManagedFolderIamBindingArgs{
			Bucket:        pulumi.Any(folder.Bucket),
			ManagedFolder: pulumi.Any(folder.Name),
			Role:          pulumi.String("roles/storage.admin"),
			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.Storage.ManagedFolderIamBinding("binding", new()
    {
        Bucket = folder.Bucket,
        ManagedFolder = folder.Name,
        Role = "roles/storage.admin",
        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.storage.ManagedFolderIamBinding;
import com.pulumi.gcp.storage.ManagedFolderIamBindingArgs;
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 ManagedFolderIamBinding("binding", ManagedFolderIamBindingArgs.builder()
            .bucket(folder.bucket())
            .managedFolder(folder.name())
            .role("roles/storage.admin")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:storage:ManagedFolderIamBinding
    properties:
      bucket: ${folder.bucket}
      managedFolder: ${folder.name}
      role: roles/storage.admin
      members:
        - user:jane@example.com

ManagedFolderIamBinding is authoritative for the specified role: it replaces all members for that role but preserves other roles in the policy. The members property accepts a list of identities (users, service accounts, groups). This approach works well when you manage all members for a role together.

Add a single member to a role non-authoritatively

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

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

const member = new gcp.storage.ManagedFolderIamMember("member", {
    bucket: folder.bucket,
    managedFolder: folder.name,
    role: "roles/storage.admin",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.storage.ManagedFolderIamMember("member",
    bucket=folder["bucket"],
    managed_folder=folder["name"],
    role="roles/storage.admin",
    member="user:jane@example.com")

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := storage.NewManagedFolderIamMember(ctx, "member", &storage.ManagedFolderIamMemberArgs{
			Bucket:        pulumi.Any(folder.Bucket),
			ManagedFolder: pulumi.Any(folder.Name),
			Role:          pulumi.String("roles/storage.admin"),
			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.Storage.ManagedFolderIamMember("member", new()
    {
        Bucket = folder.Bucket,
        ManagedFolder = folder.Name,
        Role = "roles/storage.admin",
        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.storage.ManagedFolderIamMember;
import com.pulumi.gcp.storage.ManagedFolderIamMemberArgs;
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 ManagedFolderIamMember("member", ManagedFolderIamMemberArgs.builder()
            .bucket(folder.bucket())
            .managedFolder(folder.name())
            .role("roles/storage.admin")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:storage:ManagedFolderIamMember
    properties:
      bucket: ${folder.bucket}
      managedFolder: ${folder.name}
      role: roles/storage.admin
      member: user:jane@example.com

ManagedFolderIamMember adds one member to a role without replacing existing members. The member property (singular) accepts a single identity. This resource is non-authoritative: multiple ManagedFolderIamMember resources can grant the same role to different members without conflict.

Beyond these examples

These snippets focus on specific IAM management features: authoritative vs non-authoritative updates, IAM Conditions for time-bound access, and role and member binding patterns. They’re intentionally minimal rather than complete access control solutions.

The examples reference pre-existing infrastructure such as Cloud Storage buckets with managed folders. They focus on configuring IAM permissions rather than provisioning the storage infrastructure itself.

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

Custom role definitions and organization-level roles
Service account creation and management
Multiple condition expressions (AND/OR logic)
Policy conflict resolution strategies

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 ManagedFolderIamPolicy resource reference for all available configuration options.

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Frequently Asked Questions

Resource Selection & Conflicts

What's the difference between ManagedFolderIamPolicy, ManagedFolderIamBinding, and ManagedFolderIamMember?

ManagedFolderIamPolicy is authoritative and replaces the entire IAM policy. ManagedFolderIamBinding is authoritative for a specific role, preserving other roles in the policy. ManagedFolderIamMember is non-authoritative, adding individual members while preserving existing members for that role.

Can I use ManagedFolderIamPolicy with ManagedFolderIamBinding or ManagedFolderIamMember?

No, ManagedFolderIamPolicy cannot be used with ManagedFolderIamBinding or ManagedFolderIamMember as they will conflict over policy control. Choose either Policy (authoritative) or Binding/Member (granular), never mix them.

Can I use ManagedFolderIamBinding and ManagedFolderIamMember together?

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

IAM Configuration

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

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

How do I import an IAM resource with a custom role?

Use the full custom role path in your import command: projects/my-project/roles/my-custom-role or organizations/my-org/roles/my-custom-role. Partial role names will fail.

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