Network policy disabled

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Metadata

Id: 11e7550e-c4b6-472e-adff-c698f157cdd7

Cloud Provider: gcp

Framework: Terraform

Severity: Medium

Category: Insecure Configurations

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Description

Kubernetes Engine clusters must have network policies enabled to restrict traffic between pods and control communication within the cluster. In Terraform, this requires setting network_policy.enabled = true and addons_config.network_policy_config.disabled = false, as shown below:

network_policy {
  enabled = true
}
addons_config {
  network_policy_config {
    disabled = false
  }
}

If these settings are not properly configured, unauthorized traffic between pods may be allowed, increasing the risk of lateral movement and potential compromise of sensitive applications or data within the cluster.

Compliant Code Examples

#this code is a correct code for which the query should not find any result
resource "google_container_cluster" "negative1" {
  name               = "marcellus-wallace"
  location           = "us-central1-a"
  initial_node_count = 3
  network_policy {
      enabled = true
  }
  addons_config {
    network_policy_config {
        disabled = false
    }
  }
  networking_mode = "VPC_NATIVE"

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

Non-Compliant Code Examples

#this is a problematic code where the query should report a result(s)
resource "google_container_cluster" "positive1" {
  name               = "marcellus-wallace"
  location           = "us-central1-a"
  initial_node_count = 3
  network_policy {
      enabled = true
  }

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

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

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

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

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

resource "google_container_cluster" "positive4" {
  name               = "marcellus-wallace"
  location           = "us-central1-a"
  initial_node_count = 3
  network_policy {
      enabled = true
  }
  addons_config {

  }

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

resource "google_container_cluster" "positive5" {
  name               = "marcellus-wallace"
  location           = "us-central1-a"
  initial_node_count = 3
  network_policy {
      enabled = false
  }
  addons_config {
    network_policy_config {
        disabled = false
    }
  }

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

resource "google_container_cluster" "positive6" {
  name               = "marcellus-wallace"
  location           = "us-central1-a"
  initial_node_count = 3
  network_policy {
      enabled = true
  }
  addons_config {
    network_policy_config {
        disabled = true
    }
  }

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