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, controlling who can view, modify, or use attestors for container image verification. This guide focuses on three capabilities: adding individual members to roles (non-authoritative), managing complete member lists per role (authoritative for one role), and replacing entire IAM policies (fully authoritative).

These resources reference existing attestors and assume your GCP project has Binary Authorization enabled. The examples are intentionally small. Combine them with your own attestor configuration and organizational access policies.

Grant a single user access to an attestor

Teams often need to grant individual users or service accounts access without affecting other permissions. This non-authoritative approach adds one member at a time.

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 who receives access using formats like user:jane@example.com for Google accounts or serviceAccount:app@project.iam.gserviceaccount.com for service accounts. The role property defines what they can do (e.g., roles/viewer for read-only access). This resource preserves other members who already have the same role.

Grant a role to multiple members at once

When multiple users need the same access level, binding manages the complete member list for a role.

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 property takes an array of identities. This resource is authoritative for the specified role: it replaces any previous member list for roles/viewer but leaves other roles untouched. Use this when you want to control exactly who has a specific role without managing each member individually.

Replace the entire IAM policy for an attestor

Organizations with strict access control sometimes need to define the complete IAM policy from scratch.

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 gcp.organizations.getIAMPolicy. This resource is fully authoritative: it replaces the entire policy, removing any permissions not explicitly specified. The documentation warns that AttestorIamPolicy cannot be used alongside AttestorIamBinding or AttestorIamMember, as they will conflict over policy ownership.

Beyond these examples

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

The examples reference pre-existing infrastructure such as Binary Authorization attestors and a GCP project with Binary Authorization enabled. They focus on configuring IAM permissions 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 creation and configuration

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

Can I use AttestorIamPolicy with AttestorIamBinding or AttestorIamMember?

No, AttestorIamPolicy cannot be used with AttestorIamBinding or AttestorIamMember because they will conflict over the policy. Choose one approach: use AttestorIamPolicy alone for full control, or use AttestorIamBinding and AttestorIamMember together (ensuring they don’t manage the same role).

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 AttestorIamBinding and AttestorIamMember together?

Yes, but only if they don’t grant privileges to the same role. Each role should be managed by only one resource type to avoid conflicts.

Configuration & Identity Formats

What member identity formats are supported?

The member property supports multiple formats:

allUsers and allAuthenticatedUsers for public/authenticated access
user:{emailid}, serviceAccount:{emailid}, group:{emailid} for specific identities
domain:{domain} for G Suite domains
projectOwner:projectid, projectEditor:projectid, projectViewer:projectid for project roles
Federated identities (e.g., principal://iam.googleapis.com/...)

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.

Immutability & Lifecycle

What properties are immutable after creation?

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

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