Manage GCP Data Catalog Taxonomy IAM Permissions

The gcp:datacatalog/taxonomyIamMember:TaxonomyIamMember resource, part of the Pulumi GCP provider, manages IAM access to Data Catalog taxonomies by adding individual members to roles without affecting existing access. This guide focuses on three capabilities: incremental member grants, authoritative role management, and complete policy replacement.

IAM resources for taxonomies reference existing taxonomies and IAM principals. The three resource types (TaxonomyIamMember, TaxonomyIamBinding, TaxonomyIamPolicy) differ in how authoritatively they manage access. TaxonomyIamPolicy cannot be used with the other two resources because they conflict over policy ownership. The examples are intentionally small. Combine them with your own taxonomy and principal references.

Grant a single user access to a taxonomy

Most IAM configurations add individual users or service accounts to specific resources without disrupting existing access.

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

const member = new gcp.datacatalog.TaxonomyIamMember("member", {
    taxonomy: basicTaxonomy.name,
    role: "roles/viewer",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.datacatalog.TaxonomyIamMember("member",
    taxonomy=basic_taxonomy["name"],
    role="roles/viewer",
    member="user:jane@example.com")

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := datacatalog.NewTaxonomyIamMember(ctx, "member", &datacatalog.TaxonomyIamMemberArgs{
			Taxonomy: pulumi.Any(basicTaxonomy.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.DataCatalog.TaxonomyIamMember("member", new()
    {
        Taxonomy = basicTaxonomy.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.datacatalog.TaxonomyIamMember;
import com.pulumi.gcp.datacatalog.TaxonomyIamMemberArgs;
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 TaxonomyIamMember("member", TaxonomyIamMemberArgs.builder()
            .taxonomy(basicTaxonomy.name())
            .role("roles/viewer")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:datacatalog:TaxonomyIamMember
    properties:
      taxonomy: ${basicTaxonomy.name}
      role: roles/viewer
      member: user:jane@example.com

The member property specifies one identity in the format “user:email”, “serviceAccount:email”, “group:email”, or other supported formats. The role property sets the permission level. TaxonomyIamMember is non-authoritative: it adds this member to the role without removing other members or affecting other roles on the taxonomy.

Define all members for a role authoritatively

When you need to control the complete list of members for a specific role, TaxonomyIamBinding replaces all members for that role.

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

const binding = new gcp.datacatalog.TaxonomyIamBinding("binding", {
    taxonomy: basicTaxonomy.name,
    role: "roles/viewer",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.datacatalog.TaxonomyIamBinding("binding",
    taxonomy=basic_taxonomy["name"],
    role="roles/viewer",
    members=["user:jane@example.com"])

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := datacatalog.NewTaxonomyIamBinding(ctx, "binding", &datacatalog.TaxonomyIamBindingArgs{
			Taxonomy: pulumi.Any(basicTaxonomy.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.DataCatalog.TaxonomyIamBinding("binding", new()
    {
        Taxonomy = basicTaxonomy.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.datacatalog.TaxonomyIamBinding;
import com.pulumi.gcp.datacatalog.TaxonomyIamBindingArgs;
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 TaxonomyIamBinding("binding", TaxonomyIamBindingArgs.builder()
            .taxonomy(basicTaxonomy.name())
            .role("roles/viewer")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:datacatalog:TaxonomyIamBinding
    properties:
      taxonomy: ${basicTaxonomy.name}
      role: roles/viewer
      members:
        - user:jane@example.com

The members property takes an array of identities. TaxonomyIamBinding is authoritative for the specified role: it sets exactly these members and removes any others from this role. Other roles on the taxonomy remain unchanged. You can use TaxonomyIamBinding with TaxonomyIamMember only if they manage different roles.

Replace the entire IAM policy for a taxonomy

Organizations managing IAM centrally often set the complete policy document, replacing any existing configuration.

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.datacatalog.TaxonomyIamPolicy("policy", {
    taxonomy: basicTaxonomy.name,
    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.datacatalog.TaxonomyIamPolicy("policy",
    taxonomy=basic_taxonomy["name"],
    policy_data=admin.policy_data)

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/datacatalog"
	"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 = datacatalog.NewTaxonomyIamPolicy(ctx, "policy", &datacatalog.TaxonomyIamPolicyArgs{
			Taxonomy:   pulumi.Any(basicTaxonomy.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/viewer",
                Members = new[]
                {
                    "user:jane@example.com",
                },
            },
        },
    });

    var policy = new Gcp.DataCatalog.TaxonomyIamPolicy("policy", new()
    {
        Taxonomy = basicTaxonomy.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.datacatalog.TaxonomyIamPolicy;
import com.pulumi.gcp.datacatalog.TaxonomyIamPolicyArgs;
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 TaxonomyIamPolicy("policy", TaxonomyIamPolicyArgs.builder()
            .taxonomy(basicTaxonomy.name())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:datacatalog:TaxonomyIamPolicy
    properties:
      taxonomy: ${basicTaxonomy.name}
      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 from the getIAMPolicy data source. TaxonomyIamPolicy is fully authoritative: it replaces the entire IAM policy for the taxonomy. This resource conflicts with TaxonomyIamBinding and TaxonomyIamMember; using them together causes Pulumi to fight over the policy state.

Beyond these examples

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

The examples reference pre-existing infrastructure such as Data Catalog taxonomies and IAM principals (users, service accounts, groups). They focus on configuring access rather than provisioning taxonomies or managing identity.

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

Conditional IAM bindings (condition property)
Cross-project taxonomy access (project property)
Regional taxonomy references (region property)
Custom role definitions

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 TaxonomyIamMember resource reference for all available configuration options.

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Frequently Asked Questions

Resource Selection & Conflicts

Why am I getting conflicts between TaxonomyIamPolicy and other IAM resources?

TaxonomyIamPolicy is authoritative and cannot be used with TaxonomyIamBinding or TaxonomyIamMember, as they will conflict over the policy state. Use TaxonomyIamPolicy alone, or use TaxonomyIamBinding/TaxonomyIamMember together.

Can I use TaxonomyIamBinding and TaxonomyIamMember together?

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

What's the difference between TaxonomyIamPolicy, TaxonomyIamBinding, and TaxonomyIamMember?

TaxonomyIamPolicy replaces the entire IAM policy (authoritative). TaxonomyIamBinding manages all members for a specific role, preserving other roles. TaxonomyIamMember adds a single member to a role, preserving other members and roles.

IAM Configuration

What identity formats are supported for the member property?

The member property supports multiple formats: allUsers, allAuthenticatedUsers, user:{email}, serviceAccount:{email}, group:{email}, domain:{domain}, projectOwner:{projectid}, projectEditor:{projectid}, projectViewer:{projectid}, and federated identities like principal://iam.googleapis.com/....

What format do custom roles require?

Custom roles must use the format [projects|organizations]/{parent-name}/roles/{role-name} (e.g., projects/my-project/roles/my-custom-role).

What properties are immutable after creation?

All input properties are immutable: member, role, taxonomy, project, region, and condition. Changes to any of these require resource replacement.

Using a different cloud?

Explore iam guides for other cloud providers:

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