Control: Network security groups should restrict outbound access from internet

powerpipe control run azure_compliance.control.network_security_group_outbound_access_restricted

powerpipe login
powerpipe control run azure_compliance.control.network_security_group_outbound_access_restricted --share

with unrestricted_outbound as (
  select
    distinct name sg_name
  from
    azure_network_security_group nsg,
    jsonb_array_elements(security_rules || default_security_rules ) sg,
    jsonb_array_elements_text(
      case
        when jsonb_array_length(sg -> 'properties' -> 'destinationPortRanges') > 0 then (sg -> 'properties' -> 'destinationPortRanges')
        else jsonb_build_array(sg -> 'properties' -> 'destinationPortRange')
      end ) as dport,
    jsonb_array_elements_text(
      case
        when jsonb_array_length(sg -> 'properties' -> 'sourceAddressPrefixes') > 0 then (sg -> 'properties' -> 'sourceAddressPrefixes')
        else jsonb_build_array(sg -> 'properties' -> 'sourceAddressPrefix')
      end ) as sip
  where
    sg -> 'properties' ->> 'access' = 'Allow'
    and sg -> 'properties' ->> 'direction' = 'Outbound'
    and sip in ('*', '0.0.0.0', '0.0.0.0/0', 'Internet', 'any', '<nw>/0', '/0')
    and dport = '*'
)
select
  sg.id resource,
  case
    when nsg.sg_name is null then 'ok'
    else 'alarm'
  end as status,
  case
    when nsg.sg_name is null then sg.title || ' restricts outbound access from internet.'
    else sg.title || ' allows outbound access from internet.'
  end as reason
  
  , sg.resource_group as resource_group
  , sub.display_name as subscription
from
  azure_network_security_group sg
  left join unrestricted_outbound nsg on nsg.sg_name = sg.name
  join azure_subscription sub on sub.subscription_id = sg.subscription_id;