OSLogin is disabled for VM instance

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Metadata

Id: terraform-gcp-os-login-is-disabled-for-vm-instance

Cloud Provider: GCP

Platform: Terraform

Severity: Medium

Category: Insecure Configurations

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Description

This check ensures that the enable-oslogin metadata attribute is set to true on Google Compute Engine VM instances. Disabling OS Login (enable-oslogin = "FALSE") allows users to manage SSH keys directly in instance metadata, which can lead to inconsistent access controls and make it harder to track or revoke user access. By setting enable-oslogin to true, as shown below, you centralize SSH access management through IAM, improving auditability and reducing the risk of unauthorized access.

metadata = {
  enable-oslogin = true
}

Compliant Code Examples

resource "google_compute_instance" "negative1" {
  name         = "test"
  machine_type = "e2-medium"
  zone         = "us-central1-a"

  tags = ["foo", "bar"]

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-9"
    }
  }

  // Local SSD disk
  scratch_disk {
    interface = "SCSI"
  }

  network_interface {
    network = "default"

    access_config {
      // Ephemeral IP
    }
  }

  metadata = {
    #... some other metadata

    # or if not undefined
    enable-oslogin = true
  }

  metadata_startup_script = "echo hi > /test.txt"

  service_account {
    scopes = ["userinfo-email", "compute-ro", "storage-ro"]
  }
}

Non-Compliant Code Examples

resource "google_compute_instance" "positive1" {
  name         = "test"
  machine_type = "e2-medium"
  zone         = "us-central1-a"

  tags = ["foo", "bar"]

  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-9"
    }
  }

  // Local SSD disk
  scratch_disk {
    interface = "SCSI"
  }

  network_interface {
    network = "default"

    access_config {
      // Ephemeral IP
    }
  }

  metadata = {
    #... some other metadata

    enable-oslogin = "FALSE"
  }

  metadata_startup_script = "echo hi > /test.txt"

  service_account {
    scopes = ["userinfo-email", "compute-ro", "storage-ro"]
  }
}