Control: Check for open firewall rules allowing SSH from the internet

powerpipe control run gcp_compliance.control.restrict_firewall_rule_ssh_world_open

powerpipe login
powerpipe control run gcp_compliance.control.restrict_firewall_rule_ssh_world_open --share

with ip_protocol_all as (
  select
    name
  from
    gcp_compute_firewall
  where
    direction = 'INGRESS'
    and action = 'Allow'
    and source_ranges ? & array [ '0.0.0.0/0' ]
    and (
      allowed @> '[{"IPProtocol":"all"}]'
      or allowed :: text like '%!{"IPProtocol": "tcp"}%'
    )
),
ip_protocol_tcp as (
  select
    name
  from
    gcp_compute_firewall,
    jsonb_array_elements(allowed) as p,
    jsonb_array_elements_text(p -> 'ports') as port
  where
    direction = 'INGRESS'
    and action = 'Allow'
    and source_ranges ? & array [ '0.0.0.0/0' ]
    and p ->> 'IPProtocol' = 'tcp'
    and (
      port = '22'
      or (
        port like '%-%'
        and split_part(port, '-', 1) :: integer <= 22
        and split_part(port, '-', 2) :: integer >= 22
      )
    )
)
select
  self_link resource,
  case
    when name in (
      select
        name
      from
        ip_protocol_tcp
    ) then 'alarm'
    when name in (
      select
        name
      from
        ip_protocol_all
    ) then 'alarm'
    else 'ok'
  end as status,
  case
    when name in (
      select
        name
      from
        ip_protocol_tcp
    )
    or name in (
      select
        name
      from
        ip_protocol_all
    ) then title || ' allows SSH access from internet.'
    else title || ' restricts SSH access from internet.'
  end as reason,
  location as location,
  project as project
from
  gcp_compute_firewall;