terraform.gcp.security.gcp-gke-ensure-integrity-monitoring.gcp-gke-ensure-integrity-monitoring

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Ensure Integrity Monitoring for Shielded GKE Nodes is Enabled

Run Locally

Run in CI

Defintion

rules:
  - id: gcp-gke-ensure-integrity-monitoring
    patterns:
      - pattern-inside: |
          resource "google_container_cluster" $ANYTHING {
            ...
            node_config {
              ...
              shielded_instance_config {
                enable_integrity_monitoring = false
              }
              ...
            }     
            ...
          }
    message: Ensure Integrity Monitoring for Shielded GKE Nodes is Enabled
    languages:
      - hcl
    severity: WARNING
    metadata:
      owasp:
        - A05:2017 - Broken Access Control
        - A01:2021 - Broken Access Control
      cwe:
        - "CWE-284: Improper Access Control"
      technology:
        - terraform
        - gcp
      category: security
      references:
        - https://owasp.org/Top10/A01_2021-Broken_Access_Control
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Improper Authorization

Examples

gcp-gke-ensure-integrity-monitoring.tf

# fail
# ruleid: gcp-gke-ensure-integrity-monitoring
resource "google_container_cluster" "fail1" {
  name               = var.name
  location           = var.location
  initial_node_count = 1
  project            = data.google_project.project.name

  network    = var.network
  subnetwork = var.subnetwork

  ip_allocation_policy {
    cluster_ipv4_cidr_block       = var.ip_allocation_policy["cluster_ipv4_cidr_block"]
    cluster_secondary_range_name  = var.ip_allocation_policy["cluster_secondary_range_name"]
    services_ipv4_cidr_block      = var.ip_allocation_policy["services_ipv4_cidr_block"]
    services_secondary_range_name = var.ip_allocation_policy["services_secondary_range_name"]
  }

  remove_default_node_pool = var.remove_default_node_pool

  node_config {
    workload_metadata_config {
      node_metadata = "GKE_METADATA_SERVER"
    }

    shielded_instance_config {
      enable_integrity_monitoring = false
    }
  }


  release_channel {
    channel = var.release_channel
  }

  master_auth {

    client_certificate_config {
      issue_client_certificate = false
    }
  }

  addons_config {
    http_load_balancing {
      disabled = var.http_load_balancing_disabled
    }

    network_policy_config {
      disabled = var.network_policy_config_disabled
    }
  }

  maintenance_policy {
    daily_maintenance_window {
      start_time = var.maintenance_window
    }
  }

  private_cluster_config {
    enable_private_nodes    = var.private_cluster_config["enable_private_nodes"]
    enable_private_endpoint = var.private_cluster_config["enable_private_endpoint"]
    master_ipv4_cidr_block  = var.private_cluster_config["master_ipv4_cidr_block"]
  }

  master_authorized_networks_config {
    cidr_blocks {
      cidr_block = var.master_authorized_network_cidr
    }
  }

  network_policy {
    enabled = true
  }

  pod_security_policy_config {
    enabled = var.pod_security_policy_config_enabled
  }

  resource_labels = var.resource_labels
}

# ok: gcp-gke-ensure-integrity-monitoring
resource "google_container_cluster" "success1" {
  name               = var.name
  location           = var.location
  initial_node_count = 1
  project            = data.google_project.project.name

  network    = var.network
  subnetwork = var.subnetwork

  ip_allocation_policy {
    cluster_ipv4_cidr_block       = var.ip_allocation_policy["cluster_ipv4_cidr_block"]
    cluster_secondary_range_name  = var.ip_allocation_policy["cluster_secondary_range_name"]
    services_ipv4_cidr_block      = var.ip_allocation_policy["services_ipv4_cidr_block"]
    services_secondary_range_name = var.ip_allocation_policy["services_secondary_range_name"]
  }

  remove_default_node_pool = var.remove_default_node_pool

  node_config {
    workload_metadata_config {
      node_metadata = "GKE_METADATA_SERVER"
    }
  }

  release_channel {
    channel = var.release_channel
  }

  master_auth {

    client_certificate_config {
      issue_client_certificate = false
    }
  }

  addons_config {
    http_load_balancing {
      disabled = var.http_load_balancing_disabled
    }

    network_policy_config {
      disabled = var.network_policy_config_disabled
    }
  }

  maintenance_policy {
    daily_maintenance_window {
      start_time = var.maintenance_window
    }
  }

  private_cluster_config {
    enable_private_nodes    = var.private_cluster_config["enable_private_nodes"]
    enable_private_endpoint = var.private_cluster_config["enable_private_endpoint"]
    master_ipv4_cidr_block  = var.private_cluster_config["master_ipv4_cidr_block"]
  }

  master_authorized_networks_config {
    cidr_blocks {
      cidr_block = var.master_authorized_network_cidr
    }
  }

  network_policy {
    enabled = true
  }

  pod_security_policy_config {
    enabled = var.pod_security_policy_config_enabled
  }

  resource_labels = var.resource_labels
}

# ok: gcp-gke-ensure-integrity-monitoring
resource "google_container_cluster" "success2" {
  name               = var.name
  location           = var.location
  initial_node_count = 1
  project            = data.google_project.project.name

  network    = var.network
  subnetwork = var.subnetwork

  ip_allocation_policy {
    cluster_ipv4_cidr_block       = var.ip_allocation_policy["cluster_ipv4_cidr_block"]
    cluster_secondary_range_name  = var.ip_allocation_policy["cluster_secondary_range_name"]
    services_ipv4_cidr_block      = var.ip_allocation_policy["services_ipv4_cidr_block"]
    services_secondary_range_name = var.ip_allocation_policy["services_secondary_range_name"]
  }

  remove_default_node_pool = var.remove_default_node_pool

  node_config {
    workload_metadata_config {
      node_metadata = "GKE_METADATA_SERVER"
    }
    shielded_instance_config {
      enable_integrity_monitoring = true
    }
  }

  release_channel {
    channel = var.release_channel
  }

  master_auth {

    client_certificate_config {
      issue_client_certificate = false
    }
  }

  addons_config {
    http_load_balancing {
      disabled = var.http_load_balancing_disabled
    }

    network_policy_config {
      disabled = var.network_policy_config_disabled
    }
  }

  maintenance_policy {
    daily_maintenance_window {
      start_time = var.maintenance_window
    }
  }

  private_cluster_config {
    enable_private_nodes    = var.private_cluster_config["enable_private_nodes"]
    enable_private_endpoint = var.private_cluster_config["enable_private_endpoint"]
    master_ipv4_cidr_block  = var.private_cluster_config["master_ipv4_cidr_block"]
  }

  master_authorized_networks_config {
    cidr_blocks {
      cidr_block = var.master_authorized_network_cidr
    }
  }

  network_policy {
    enabled = true
  }

  pod_security_policy_config {
    enabled = var.pod_security_policy_config_enabled
  }

  resource_labels = var.resource_labels
}