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 access with IAM Conditions, and role-based and member-based permission grants.

IAM resources reference existing managed folders within Cloud Storage buckets and grant permissions to IAM principals. The examples are intentionally small. Combine them with your own bucket infrastructure and identity management.

Replace the entire IAM policy for a managed folder

When you need complete control over who can access a managed folder, 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 ManagedFolderIamPolicy resource is authoritative: it replaces the entire IAM policy for the managed folder. The policyData comes from the getIAMPolicy data source, which defines bindings between roles and members. The bucket and managedFolder properties identify which folder to configure.

Set time-bound access with IAM Conditions

Access requirements often include expiration dates, such as granting temporary permissions to contractors or time-limited project access.

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")

IAM Conditions add temporal or contextual constraints to role bindings. The condition block requires a title, optional description, and an expression using Common Expression Language (CEL). Here, the expression checks that the request time is before midnight on January 1, 2020, automatically revoking access after that timestamp.

Grant a role to multiple members at once

Teams often need to grant the same role to several users or service accounts without replacing other role assignments on the folder.

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

The ManagedFolderIamBinding resource is authoritative for a specific role: it sets the complete list of members for that role while preserving other roles on the folder. The members property accepts a list of IAM principals in the format “user:email”, “serviceAccount:email”, or “group:email”.

Add a single member to a role incrementally

When onboarding individual users or service accounts, you often want to add them to a role without affecting existing members.

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

The ManagedFolderIamMember resource is non-authoritative: it adds a single member to a role without modifying other members. This approach works well for incremental access grants where you don’t want to manage the complete member list. The member property specifies one IAM principal.

Beyond these examples

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

The examples reference pre-existing infrastructure such as Cloud Storage buckets with managed folders, and IAM principals (users, service accounts, groups). They focus on configuring IAM permissions rather than provisioning the underlying storage or identity infrastructure.

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

Custom role definitions and full role paths
Multiple condition expressions (AND/OR logic)
IAM policy conflict resolution strategies
Audit logging and policy change tracking

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?

Choose based on your needs:

ManagedFolderIamPolicy: Authoritative. Replaces the entire IAM policy.
ManagedFolderIamBinding: Authoritative for a specific role. Preserves other roles.
ManagedFolderIamMember: Non-authoritative. Adds a single member to a role, preserving other members.

Can I use ManagedFolderIamPolicy with ManagedFolderIamBinding or ManagedFolderIamMember?

No. ManagedFolderIamPolicy cannot be used with ManagedFolderIamBinding or ManagedFolderIamMember because they will conflict over policy control.

Can I use ManagedFolderIamBinding and ManagedFolderIamMember together?

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

IAM Conditions & Custom Roles

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

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

How do I import a managed folder IAM resource with a custom role?

Use the full custom role name including the project or organization prefix: projects/my-project/roles/my-custom-role or organizations/my-org/roles/my-custom-role.

Configuration & Immutability

What properties can't be changed after creation?

Both bucket and managedFolder are immutable. Changing either requires recreating the resource.

Using a different cloud?

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