gcloud-org-load-balancer-types: Load Balancer Creation Not Restricted by Type

id: gcloud-org-load-balancer-types

info:
  name: Load Balancer Creation Not Restricted by Type
  author: princechaddha
  severity: medium
  description: |
    Ensure that only compliant load balancer types can be used to create Google Cloud load balancers for the GCP projects and folders within your organization. The list of allowed load balancer types can only include values from the following list: INTERNAL_TCP_UDP, INTERNAL_HTTP_HTTPS, EXTERNAL_NETWORK_TCP_UDP, EXTERNAL_TCP_PROXY, EXTERNAL_SSL_PROXY, EXTERNAL_HTTP_HTTPS.
  impact: |
    By default, creation of all types of Google Cloud load balancers is allowed. Without restrictions, users can create any type of load balancer, potentially violating internal compliance requirements.
  remediation: |
    Configure the "Restrict Load Balancer Creation Based on Load Balancer Types" policy at the organization level to explicitly specify which load balancer types are allowed. Use the 'in:' prefix followed by INTERNAL or EXTERNAL to include all internal or external types.
  reference:
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/gcp/ResourceManager/restrict-load-balancer-creation-based-on-type.html
    - https://cloud.google.com/load-balancing/docs/load-balancer-types
  tags: cloud,devops,gcp,gcloud,resourcemanager,security,load-balancer,networking,gcp-cloud-config

flow: |
  code(1)
  for(let orgId of iterate(template.orgIds)){
    set("orgId", orgId)
    code(2)
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      gcloud organizations list --format="json(name)"

    extractors:
      - type: json
        name: orgIds
        internal: true
        json:
          - '.[].name'

  - engine:
      - sh
      - bash
    source: |
      gcloud alpha resource-manager org-policies describe compute.restrictLoadBalancerCreationForTypes --organization=$orgId --effective --format="json(listPolicy.allValues)"

    matchers:
      - type: word
        words:
          - "ALLOW"

    extractors:
      - type: dsl
        dsl:
          - '"Organization " + orgId + " has not restricted load balancer creation by type, allowing all load balancer types to be created"'
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