Control: VPC security groups should restrict ingress SSH access from 0.0.0.0/0

powerpipe control run terraform_aws_compliance.control.vpc_security_group_restrict_ingress_ssh_all

powerpipe login
powerpipe control run terraform_aws_compliance.control.vpc_security_group_restrict_ingress_ssh_all --share

with rules as (
  select distinct
    name,
    count(*) as num_ssh_rules
  from
    terraform_resource,
    jsonb_array_elements(
      case jsonb_typeof(arguments -> 'ingress')
        when 'array' then (arguments -> 'ingress')
        else jsonb_build_array(arguments -> 'ingress')
      end
      ) ingress
  where
    type = 'aws_security_group' and
    ingress is not null
    and (
      (ingress -> 'cidr_blocks') @> '["0.0.0.0/0"]'
      or (ingress -> 'ipv6_cidr_blocks') @> '["::/0"]'
      or (ingress -> 'ipv6_cidr_blocks') @> '["0000:0000:0000:0000:0000:0000:0000:0000/0"]'
     )
    and (
      ingress ->> 'protocol' = '-1'
      or (
        (ingress ->> 'from_port') :: integer >= 22 and
        (ingress ->> 'to_port') :: integer <= 22
      )
    )
  group by
    name
)
select
  type || ' ' || r.name as resource,
  case
    when g.name is null then 'ok'
    else 'alarm'
  end as status,
  r.name || case
    when g.name is null then ' ingress restricted for SSH from 0.0.0.0/0'
    else ' contains ' || g.num_ssh_rules || ' ingress rule(s) allowing SSH from 0.0.0.0/0'
  end || '.' reason
  
  , path || ':' || start_line
from
  terraform_resource as r
  left join rules as g on g.name = r.name
where
  type = 'aws_security_group';