Private cluster disabled

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Metadata

Id: 6ccb85d7-0420-4907-9380-50313f80946b

Cloud Provider: gcp

Framework: Terraform

Severity: Medium

Category: Insecure Configurations

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Description

Kubernetes clusters should be created with private clusters enabled by configuring the private_cluster_config block and setting both enable_private_nodes and enable_private_endpoint to true. Failing to do so allows access to the cluster’s control plane and nodes from public networks, increasing exposure to potential attacks and unauthorized access. A secure configuration in Terraform looks like:

resource "google_container_cluster" "secure" {
  name = "example"
  location = "us-central1-a"
  initial_node_count = 3
  private_cluster_config {
    enable_private_endpoint = true
    enable_private_nodes    = true
  }
}

Compliant Code Examples

resource "google_container_cluster" "negative1" {
  name = "marcellus-wallace"
  location = "us-central1-a"
  initial_node_count = 3
  private_cluster_config {
        enable_private_endpoint = true
        enable_private_nodes = true
  }

  timeouts {
    create = "30m"
    update = "40m"
  }
}

Non-Compliant Code Examples

resource "google_container_cluster" "positive1" {
  name = "marcellus-wallace"
  location = "us-central1-a"
  initial_node_count = 3

  timeouts {
    create = "30m"
    update = "40m"
  }
}

resource "google_container_cluster" "positive2" {
  name = "marcellus-wallace"
  location = "us-central1-a"
  initial_node_count = 3
  private_cluster_config {
        enable_private_endpoint = true
  }

  timeouts {
    create = "30m"
    update = "40m"
  }
}

resource "google_container_cluster" "positive3" {
  name = "marcellus-wallace"
  location = "us-central1-a"
  initial_node_count = 3
  private_cluster_config {
        enable_private_nodes = true
  }

  timeouts {
    create = "30m"
    update = "40m"
  }
}

resource "google_container_cluster" "positive4" {
  name = "marcellus-wallace"
  location = "us-central1-a"
  initial_node_count = 3
  private_cluster_config {

  }

  timeouts {
    create = "30m"
    update = "40m"
  }
}

resource "google_container_cluster" "positive5" {
  name = "marcellus-wallace"
  location = "us-central1-a"
  initial_node_count = 3
  private_cluster_config {
        enable_private_endpoint = false
        enable_private_nodes = true
  }

  timeouts {
    create = "30m"
    update = "40m"
  }
}

resource "google_container_cluster" "positive6" {
  name = "marcellus-wallace"
  location = "us-central1-a"
  initial_node_count = 3
  private_cluster_config {
        enable_private_endpoint = true
        enable_private_nodes = false
  }

  timeouts {
    create = "30m"
    update = "40m"
  }
}

resource "google_container_cluster" "positive7" {
  name = "marcellus-wallace"
  location = "us-central1-a"
  initial_node_count = 3
  private_cluster_config {
        enable_private_endpoint = false
        enable_private_nodes = false
  }

  timeouts {
    create = "30m"
    update = "40m"
  }
}