Control: GKE clusters control plane should restrict public access

powerpipe control run terraform_gcp_compliance.control.kubernetes_cluster_control_plane_restrict_public_access

powerpipe login
powerpipe control run terraform_gcp_compliance.control.kubernetes_cluster_control_plane_restrict_public_access --share

with public_control_plane as (
  select
    distinct address
  from
    terraform_resource,
    jsonb_array_elements(
      case
        jsonb_typeof(attributes_std -> 'master_authorized_networks_config' -> 'cidr_blocks')
        when 'array' then (attributes_std -> 'master_authorized_networks_config' -> 'cidr_blocks')
        when 'object' then jsonb_build_array(attributes_std -> 'master_authorized_networks_config' -> 'cidr_blocks')
        else null
      end
    ) as s
  where
    type = 'google_container_cluster'
    and s ->> 'cidr_block' = '0.0.0.0/0'
)
select
  r.address as resource,
  case
    when p.address is null then 'ok'
    else 'alarm'
  end as status,
  split_part(r.address, '.', 2) || case
    when p.address is null then ' control plane not publicly accessible'
    else ' control plane publicly accessible'
  end || '.' reason
  
  , path || ':' || start_line
from
  terraform_resource as r
  left join public_control_plane as p on p.address = r.address
where
  type = 'google_container_cluster';