terraform.gcp.security.gcp-gke-master-authz-networks-enabled.gcp-gke-master-authz-networks-enabled

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Ensure master authorized networks is set to enabled in GKE clusters

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Defintion

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rules:
  - id: gcp-gke-master-authz-networks-enabled
    patterns:
      - pattern: resource
      - pattern-inside: |
          resource "google_container_cluster" "..." {
          ...
          }
      - pattern-not-inside: |
          resource "google_container_cluster" "..." {
          ...
          master_authorized_networks_config {
            ...
          }
          ...
          }
    message: Ensure master authorized networks is set to enabled in GKE clusters
    metadata:
      owasp:
        - A05:2017 - Broken Access Control
        - A01:2021 - Broken Access Control
      cwe:
        - "CWE-284: Improper Access Control"
      category: security
      technology:
        - terraform
        - gcp
      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
    languages:
      - hcl
    severity: WARNING

Examples

gcp-gke-master-authz-networks-enabled.tf

# fail
# ruleid: gcp-gke-master-authz-networks-enabled
resource "google_container_cluster" "fail" {
  name               = "marcellus-wallace"
  location           = "us-central1-a"
  initial_node_count = 3
}

# ok: gcp-gke-master-authz-networks-enabled
resource "google_container_cluster" "success" {
  name               = "marcellus-wallace"
  location           = "us-central1-a"
  initial_node_count = 3
  master_authorized_networks_config {
    cidr_blocks {
      cidr_block   = "73.35.171.194/32"
      display_name = "net1"
    }
  }
}