Manage GCP Binary Authorization Attestor IAM Access

The gcp:binaryauthorization/attestorIamMember:AttestorIamMember resource, part of the Pulumi GCP provider, manages IAM permissions for Binary Authorization attestors. This guide focuses on three approaches: non-authoritative member addition, authoritative role binding, and complete policy replacement.

Binary Authorization uses attestors to verify container images before deployment. The three IAM resources (AttestorIamPolicy, AttestorIamBinding, AttestorIamMember) offer different levels of control over who can access these attestors. AttestorIamPolicy replaces the entire policy, AttestorIamBinding manages all members for a specific role, and AttestorIamMember adds individual members without affecting others. The examples are intentionally small. Combine them with your own attestor resources and access control requirements.

Replace the entire IAM policy for an attestor

When you need complete control over attestor access, replacing the entire IAM policy ensures no unexpected permissions remain.

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 AttestorIamPolicy resource sets the complete IAM policy for the attestor, removing any bindings not specified in policyData. The getIAMPolicy data source constructs the policy structure with bindings that map roles to members. This approach is authoritative: it replaces all existing permissions.

Grant a role to multiple members at once

Teams often grant the same role to several users or service accounts simultaneously.

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 AttestorIamBinding resource manages all members for a specific role. The members array lists everyone who should have that role. This resource is authoritative for its role but preserves other roles on the attestor. Multiple AttestorIamBinding resources can coexist if they manage different roles.

Add a single member to an attestor role

When onboarding individual users, adding them one at a time avoids conflicts with other IAM configurations.

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 AttestorIamMember resource grants a role to one member without affecting other members of that role. This non-authoritative approach lets you add members incrementally. Multiple AttestorIamMember resources can grant the same role to different members, and they can coexist with AttestorIamBinding resources as long as they don’t manage the same role.

Beyond these examples

These snippets focus on specific IAM management approaches: authoritative vs non-authoritative IAM management, and single-member and multi-member role grants. 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 appropriate permissions. They focus on configuring IAM bindings rather than provisioning attestors or service accounts.

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

Conditional IAM bindings (condition property)
Custom role definitions
Service account creation and management
Attestor resource provisioning

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 AttestorIamMember resource reference for all available configuration options.

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Frequently Asked Questions

Resource Selection & Conflicts

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

AttestorIamPolicy is authoritative and replaces the entire IAM policy. AttestorIamBinding is authoritative for a specific role, preserving other roles. AttestorIamMember is non-authoritative, adding a single member to a role while preserving other members.

Can I use AttestorIamPolicy with AttestorIamBinding or AttestorIamMember?

No, AttestorIamPolicy cannot be used with AttestorIamBinding or AttestorIamMember because they will conflict over the policy.

Can I use AttestorIamBinding with AttestorIamMember?

Yes, but only if they don’t grant privileges to the same role. Using both for the same role will cause conflicts.

IAM Configuration

What member identity formats are supported?

The member property supports multiple formats:

allUsers (anyone on the internet)
allAuthenticatedUsers (anyone with a Google account)
user:{emailid} (specific Google account)
serviceAccount:{emailid} (service account)
group:{emailid} (Google group)
domain:{domain} (G Suite domain)
projectOwner/Editor/Viewer:{projectid} (project-level roles)
Federated identities (workload/workforce identity pools)

How do I specify custom 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.

What role can I assign with AttestorIamBinding?

You can assign any role, but only one AttestorIamBinding can be used per role. If you need multiple bindings for the same role, use AttestorIamMember instead.

Resource Properties & Immutability

What properties are immutable after creation?

All input properties are immutable: attestor, member, project, role, and condition. You must recreate the resource to change any of these values.

What is the etag output property?

The etag is a computed output property representing the IAM policy’s version identifier, used for optimistic concurrency control.

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