Manage GCP Binary Authorization Attestor IAM Bindings

The gcp:binaryauthorization/attestorIamBinding:AttestorIamBinding resource, part of the Pulumi GCP provider, manages IAM role bindings for Binary Authorization attestors, controlling which identities can access attestor resources. This guide focuses on three capabilities: granting roles to multiple members, adding individual members non-authoritatively, and replacing entire IAM policies.

IAM resources for attestors come in three variants with different update behaviors. AttestorIamBinding is authoritative for a specific role, meaning it replaces all members for that role. AttestorIamMember adds individual members without affecting others. AttestorIamPolicy replaces the entire policy and cannot be used alongside the other two resources. The examples are intentionally small. Combine them with your own attestor infrastructure and identity management workflows.

Grant a role to multiple members at once

Teams managing attestors often need to grant the same role to multiple users or service accounts simultaneously, such as giving viewer access to a development team.

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

const binding = new gcp.binaryauthorization.AttestorIamBinding("binding", {
    project: attestor.project,
    attestor: attestor.name,
    role: "roles/viewer",
    members: ["user:jane@example.com"],
});

import pulumi
import pulumi_gcp as gcp

binding = gcp.binaryauthorization.AttestorIamBinding("binding",
    project=attestor["project"],
    attestor=attestor["name"],
    role="roles/viewer",
    members=["user:jane@example.com"])

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := binaryauthorization.NewAttestorIamBinding(ctx, "binding", &binaryauthorization.AttestorIamBindingArgs{
			Project:  pulumi.Any(attestor.Project),
			Attestor: pulumi.Any(attestor.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.BinaryAuthorization.AttestorIamBinding("binding", new()
    {
        Project = attestor.Project,
        Attestor = attestor.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.binaryauthorization.AttestorIamBinding;
import com.pulumi.gcp.binaryauthorization.AttestorIamBindingArgs;
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 AttestorIamBinding("binding", AttestorIamBindingArgs.builder()
            .project(attestor.project())
            .attestor(attestor.name())
            .role("roles/viewer")
            .members("user:jane@example.com")
            .build());

    }
}

resources:
  binding:
    type: gcp:binaryauthorization:AttestorIamBinding
    properties:
      project: ${attestor.project}
      attestor: ${attestor.name}
      role: roles/viewer
      members:
        - user:jane@example.com

The members array lists all identities that receive the specified role. This resource is authoritative for the role, meaning it replaces any existing members for that role on the attestor. The attestor and project properties identify which attestor resource to modify.

Add a single member to a role incrementally

When onboarding individual users or service accounts, you can grant access without affecting existing members of the same role.

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

const member = new gcp.binaryauthorization.AttestorIamMember("member", {
    project: attestor.project,
    attestor: attestor.name,
    role: "roles/viewer",
    member: "user:jane@example.com",
});

import pulumi
import pulumi_gcp as gcp

member = gcp.binaryauthorization.AttestorIamMember("member",
    project=attestor["project"],
    attestor=attestor["name"],
    role="roles/viewer",
    member="user:jane@example.com")

package main

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

func main() {
	pulumi.Run(func(ctx *pulumi.Context) error {
		_, err := binaryauthorization.NewAttestorIamMember(ctx, "member", &binaryauthorization.AttestorIamMemberArgs{
			Project:  pulumi.Any(attestor.Project),
			Attestor: pulumi.Any(attestor.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.BinaryAuthorization.AttestorIamMember("member", new()
    {
        Project = attestor.Project,
        Attestor = attestor.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.binaryauthorization.AttestorIamMember;
import com.pulumi.gcp.binaryauthorization.AttestorIamMemberArgs;
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 AttestorIamMember("member", AttestorIamMemberArgs.builder()
            .project(attestor.project())
            .attestor(attestor.name())
            .role("roles/viewer")
            .member("user:jane@example.com")
            .build());

    }
}

resources:
  member:
    type: gcp:binaryauthorization:AttestorIamMember
    properties:
      project: ${attestor.project}
      attestor: ${attestor.name}
      role: roles/viewer
      member: user:jane@example.com

The member property specifies a single identity to add. Unlike AttestorIamBinding, this resource is non-authoritative: it adds the member without removing others who already have the role. You can use multiple AttestorIamMember resources for the same role, but they cannot conflict with an AttestorIamBinding for that same role.

Replace the entire IAM policy with a new definition

Some workflows require complete control over an attestor’s IAM policy, replacing all existing bindings with a new authoritative definition.

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.binaryauthorization.AttestorIamPolicy("policy", {
    project: attestor.project,
    attestor: attestor.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.binaryauthorization.AttestorIamPolicy("policy",
    project=attestor["project"],
    attestor=attestor["name"],
    policy_data=admin.policy_data)

package main

import (
	"github.com/pulumi/pulumi-gcp/sdk/v9/go/gcp/binaryauthorization"
	"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 = binaryauthorization.NewAttestorIamPolicy(ctx, "policy", &binaryauthorization.AttestorIamPolicyArgs{
			Project:    pulumi.Any(attestor.Project),
			Attestor:   pulumi.Any(attestor.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.BinaryAuthorization.AttestorIamPolicy("policy", new()
    {
        Project = attestor.Project,
        Attestor = attestor.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.binaryauthorization.AttestorIamPolicy;
import com.pulumi.gcp.binaryauthorization.AttestorIamPolicyArgs;
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 AttestorIamPolicy("policy", AttestorIamPolicyArgs.builder()
            .project(attestor.project())
            .attestor(attestor.name())
            .policyData(admin.policyData())
            .build());

    }
}

resources:
  policy:
    type: gcp:binaryauthorization:AttestorIamPolicy
    properties:
      project: ${attestor.project}
      attestor: ${attestor.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 retrieved from getIAMPolicy. This resource replaces the entire policy, removing any bindings not included in the new policy. It cannot be used alongside AttestorIamBinding or AttestorIamMember resources, as they would conflict over policy ownership.

Beyond these examples

These snippets focus on specific IAM binding features: role-based access control (binding and member resources) and authoritative policy replacement. They’re intentionally minimal rather than full access control configurations.

The examples reference pre-existing infrastructure such as Binary Authorization attestors and a GCP project with Binary Authorization enabled. They focus on configuring IAM bindings rather than provisioning attestors or projects.

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

Conditional IAM bindings (condition property)
Custom role definitions
Federated identity configuration details
Policy conflict resolution between resource types

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 AttestorIamBinding resource reference for all available configuration options.

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Frequently Asked Questions

Resource Conflicts & Compatibility

Can I use AttestorIamPolicy with AttestorIamBinding or AttestorIamMember?

No, AttestorIamPolicy cannot be used with AttestorIamBinding or AttestorIamMember because they will conflict over the policy configuration. Choose one approach: use AttestorIamPolicy for full policy control, or use AttestorIamBinding/AttestorIamMember for role-level or member-level management.

Can I use AttestorIamBinding and AttestorIamMember together?

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

IAM Configuration

What's the difference between AttestorIamPolicy, AttestorIamBinding, and AttestorIamMember?

Each serves a different use case:

AttestorIamPolicy: Authoritative, replaces the entire IAM policy
AttestorIamBinding: Authoritative for a specific role, preserves other roles
AttestorIamMember: Non-authoritative, adds a single member to a role while preserving other members

What member identity formats are supported?

The members property supports multiple formats:

allUsers and allAuthenticatedUsers for public access
user:{email}, serviceAccount:{email}, group:{email} for specific identities
domain:{domain} for G Suite domains
projectOwner:projectid, projectEditor:projectid, projectViewer:projectid for project roles
Federated identities using principal:// format (see Principal identifiers documentation)

What's the format for custom IAM roles?

Custom roles must use the 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.

Immutability & Updates

What properties can't be changed after creation?

The following properties are immutable: attestor, project, role, and condition. Changing any of these requires recreating the resource.

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