Control: PodTemplate containers kube-apiserver should only make use of strong cryptographic ciphers

powerpipe control run kubernetes_compliance.control.pod_template_container_strong_kube_apiserver_cryptographic_ciphers

powerpipe login
powerpipe control run kubernetes_compliance.control.pod_template_container_strong_kube_apiserver_cryptographic_ciphers --share

with container_list as (
  select
    c ->> 'name' as container_name,
    trim('"' from split_part(co::text, '=', 2)) as value,
    j.name as pod_template
  from
    kubernetes_pod_template as j,
    jsonb_array_elements(template -> 'spec' -> 'containers') as c,
    jsonb_array_elements_text(c -> 'command') as co
  where
    co like '%--tls-cipher-suites=%'
), container_name_with_pod_template_name as (
  select
    j.name as pod_template_name,
    j.uid as pod_template_uid,
    j.path as path,
    j.start_line as start_line,
    j.end_line as end_line,
    j.context_name as context_name,
    j.namespace as namespace,
    j.source_type as source_type,
    j.tags as tags,
    j._ctx as _ctx,
    c.*
  from
    kubernetes_pod_template as j,
    jsonb_array_elements(template -> 'spec' -> 'containers') as c
)
select
  coalesce(j.pod_template_uid, concat(j.path, ':', j.start_line)) as resource,
  case
    when (j.value -> 'command') is null or not ((j.value -> 'command') @> '["kube-apiserver"]') then 'ok'
    when l.container_name is not null and (j.value -> 'command') @> '["kube-apiserver"]'
      and string_to_array(l.value, ',') <@ array['TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256','TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256','TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305','TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384','TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305','TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384','TLS_RSA_WITH_AES_256_GCM_SHA384','TLS_RSA_WITH_AES_128_GCM_SHA256']
    then 'ok'
    else 'alarm'
  end as status,
  case
    when (j.value -> 'command') is null then j.value ->> 'name' || ' command not defined.'
    when not ((j.value -> 'command') @> '["kube-apiserver"]') then j.value ->> 'name' || ' kube-apiserver not defined.'
    when l.container_name is not null and (j.value -> 'command') @> '["kube-apiserver"]'
      and string_to_array(l.value, ',') <@ array['TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256','TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256','TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305','TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384','TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305','TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384','TLS_RSA_WITH_AES_256_GCM_SHA384','TLS_RSA_WITH_AES_128_GCM_SHA256']
    then j.value ->> 'name' || ' kube-apiserver uses strong cryptographic ciphers.'
    else j.value ->> 'name' || ' kube-apiserver not using strong cryptographic ciphers.'
  end as reason,
  j.pod_template_name as pod_template_name
  
  , coalesce(context_name, '') as context_name, namespace, source_type, coalesce(path || ':' || start_line || '-' || end_line, '') as path
from
  container_name_with_pod_template_name as j
  left join container_list as l on j.value ->> 'name' = l.container_name and j.pod_template_name = l.pod_template;