Manage GCP Tag Key IAM Bindings

The gcp:tags/tagKeyIamBinding:TagKeyIamBinding resource, part of the Pulumi GCP provider, manages IAM role bindings for tag keys, controlling which identities can view, edit, or administer tags. This guide focuses on three capabilities: granting roles to multiple members, time-based access with IAM Conditions, and adding individual members non-authoritatively.

Tag key IAM bindings reference existing TagKey resources. The examples are intentionally small. Combine them with your own tag key infrastructure and identity management.

Grant a role to multiple members at once

When managing tag key permissions, you often need to grant the same role to multiple users or service accounts simultaneously.

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

const binding = new gcp.tags.TagKeyIamBinding("binding", {
    tagKey: key.name,
    role: "roles/viewer",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.tags.TagKeyIamBinding("binding",
    tag_key=key["name"],
    role="roles/viewer",
    members=["user:jane@example.com"])

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := tags.NewTagKeyIamBinding(ctx, "binding", &tags.TagKeyIamBindingArgs{
			TagKey: pulumi.Any(key.Name),
			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.Tags.TagKeyIamBinding("binding", new()
    {
        TagKey = key.Name,
        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.tags.TagKeyIamBinding;
import com.pulumi.gcp.tags.TagKeyIamBindingArgs;
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 TagKeyIamBinding("binding", TagKeyIamBindingArgs.builder()
            .tagKey(key.name())
            .role("roles/viewer")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:tags:TagKeyIamBinding
    properties:
      tagKey: ${key.name}
      role: roles/viewer
      members:
        - user:jane@example.com

The members array lists all identities that receive the specified role. TagKeyIamBinding is authoritative for the role, meaning it replaces any existing members for that role. The tagKey property references the tag key resource, and role specifies the permission level (e.g., roles/viewer for read-only access).

Add time-based access with IAM Conditions

Organizations implementing temporary access can use IAM Conditions to automatically expire permissions at a specific date.

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

const binding = new gcp.tags.TagKeyIamBinding("binding", {
    tagKey: key.name,
    role: "roles/viewer",
    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\")",
    },
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.tags.TagKeyIamBinding("binding",
    tag_key=key["name"],
    role="roles/viewer",
    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\")",
    })

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := tags.NewTagKeyIamBinding(ctx, "binding", &tags.TagKeyIamBindingArgs{
			TagKey: pulumi.Any(key.Name),
			Role:   pulumi.String("roles/viewer"),
			Members: pulumi.StringArray{
				pulumi.String("user:jane@example.com"),
			},
			Condition: &tags.TagKeyIamBindingConditionArgs{
				Title:       pulumi.String("expires_after_2019_12_31"),
				Description: pulumi.String("Expiring at midnight of 2019-12-31"),
				Expression:  pulumi.String("request.time < timestamp(\"2020-01-01T00:00:00Z\")"),
			},
		})
		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.Tags.TagKeyIamBinding("binding", new()
    {
        TagKey = key.Name,
        Role = "roles/viewer",
        Members = new[]
        {
            "user:jane@example.com",
        },
        Condition = new Gcp.Tags.Inputs.TagKeyIamBindingConditionArgs
        {
            Title = "expires_after_2019_12_31",
            Description = "Expiring at midnight of 2019-12-31",
            Expression = "request.time < timestamp(\"2020-01-01T00:00:00Z\")",
        },
    });

});

package generated_program;

import com.pulumi.Context;
import com.pulumi.Pulumi;
import com.pulumi.core.Output;
import com.pulumi.gcp.tags.TagKeyIamBinding;
import com.pulumi.gcp.tags.TagKeyIamBindingArgs;
import com.pulumi.gcp.tags.inputs.TagKeyIamBindingConditionArgs;
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 TagKeyIamBinding("binding", TagKeyIamBindingArgs.builder()
            .tagKey(key.name())
            .role("roles/viewer")
            .members("user:jane@example.com")
            .condition(TagKeyIamBindingConditionArgs.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());

    }
}

resources:
  binding:
    type: gcp:tags:TagKeyIamBinding
    properties:
      tagKey: ${key.name}
      role: roles/viewer
      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 the binding. The expression property uses CEL (Common Expression Language) to define when access is valid. In this configuration, the timestamp function sets an expiration date, automatically revoking access after 2019-12-31. The title and description provide human-readable context for the condition.

Add a single member to an existing role

When you need to grant access to one additional user without affecting other members already assigned to the role, use TagKeyIamMember for non-authoritative updates.

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

const member = new gcp.tags.TagKeyIamMember("member", {
    tagKey: key.name,
    role: "roles/viewer",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.tags.TagKeyIamMember("member",
    tag_key=key["name"],
    role="roles/viewer",
    member="user:jane@example.com")

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := tags.NewTagKeyIamMember(ctx, "member", &tags.TagKeyIamMemberArgs{
			TagKey: pulumi.Any(key.Name),
			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.Tags.TagKeyIamMember("member", new()
    {
        TagKey = key.Name,
        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.tags.TagKeyIamMember;
import com.pulumi.gcp.tags.TagKeyIamMemberArgs;
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 TagKeyIamMember("member", TagKeyIamMemberArgs.builder()
            .tagKey(key.name())
            .role("roles/viewer")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:tags:TagKeyIamMember
    properties:
      tagKey: ${key.name}
      role: roles/viewer
      member: user:jane@example.com

Unlike TagKeyIamBinding, TagKeyIamMember adds a single member without replacing existing members for the role. The member property specifies one identity (user, service account, group, or domain). This resource preserves other members already granted the same role, making it safe to use alongside other IAM configurations.

Beyond these examples

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

The examples reference pre-existing infrastructure such as TagKey resources (via key.name). They focus on configuring IAM bindings rather than creating the underlying tag keys.

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

  • Full IAM policy replacement (TagKeyIamPolicy)
  • Custom role format requirements
  • Federated identity principals
  • Resource conflict rules between Policy, Binding, and Member

These omissions are intentional: the goal is to illustrate how each IAM binding feature is wired, not provide drop-in access control modules. See the TagKeyIamBinding resource reference for all available configuration options.

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Frequently Asked Questions

Resource Conflicts & Compatibility
Can I use TagKeyIamPolicy together with TagKeyIamBinding or TagKeyIamMember?
No, gcp.tags.TagKeyIamPolicy cannot be used with gcp.tags.TagKeyIamBinding or gcp.tags.TagKeyIamMember because they will conflict over the policy. Use either the authoritative TagKeyIamPolicy or the non-authoritative TagKeyIamBinding/TagKeyIamMember approach, but not both.
Can I use TagKeyIamBinding and TagKeyIamMember together?
Yes, but only if they grant privileges to different roles. Using both resources for the same role will cause conflicts.
What's the difference between TagKeyIamPolicy, TagKeyIamBinding, and TagKeyIamMember?
TagKeyIamPolicy is authoritative and replaces the entire policy. TagKeyIamBinding is authoritative for a specific role but preserves other roles. TagKeyIamMember is non-authoritative and adds individual members without affecting other members for the same role.
IAM Roles & Members
What format should I use for custom roles?
Custom roles must use the full path format: [projects|organizations]/{parent-name}/roles/{role-name}. For example, projects/my-project/roles/my-custom-role or organizations/my-org/roles/my-custom-role.
What member identity formats are supported?
Supported formats include allUsers, allAuthenticatedUsers, user:{email}, serviceAccount:{email}, group:{email}, domain:{domain}, projectOwner:projectid, projectEditor:projectid, projectViewer:projectid, and federated identities using principal:// URIs.
IAM Conditions
Are there limitations when using IAM Conditions?
Yes, IAM Conditions have known limitations. Review the GCP IAM Conditions limitations documentation before using them.
How do I add time-based access conditions to a binding?
Use the condition property with title, description, and expression fields. For example, to expire access on a specific date: expression: "request.time < timestamp(\"2020-01-01T00:00:00Z\")".
Configuration & Immutability
What properties can't I change after creating a TagKeyIamBinding?
The role, tagKey, and condition properties are immutable and cannot be changed after creation. You must recreate the resource to modify these values.

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