Control: SSL/TLS servers should use secure cipher suites

Description

A cipher suite is a set of cryptographic algorithms. The set of algorithms that cipher suites usually contain include: a key exchange algorithm, a bulk encryption algorithm, and a message authentication code (MAC) algorithm. It is recommended to use secure ciphers like Authenticated Encryption with Associated Data (AEAD) cipher suites and Perfect Forward Secrecy (PFS) ciphers. The following cipher suites are considered insecure: TLS_RSA_WITH_RC4_128_SHA, TLS_RSA_WITH_3DES_EDE_CBC_SHA, TLS_RSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256.

Usage

Run the control in your terminal:

powerpipe control run net_insights.control.ssl_use_secure_cipher_suite

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run net_insights.control.ssl_use_secure_cipher_suite --share

Steampipe Tables

net_tls_connection

Params

Args	Name	Default	Description	Variable
$1	domain_names	`["github.com","microsoft.com"]`	DNS domain names.	domain_names

SQL

with domain_list as (
  select
    domain,
    concat(domain, ':443') as address
  from
    jsonb_array_elements_text(to_jsonb($1 :: text [ ])) as domain
),
check_insecure_cipher as (
  select
    address,
    count(*)
  from
    net_tls_connection
  where
    address in (
      select
        address
      from
        domain_list
    )
    and cipher_suite_name in (
      'TLS_RSA_WITH_RC4_128_SHA',
      'TLS_RSA_WITH_3DES_EDE_CBC_SHA',
      'TLS_RSA_WITH_AES_128_CBC_SHA256',
      'TLS_ECDHE_ECDSA_WITH_RC4_128_SHA',
      'TLS_ECDHE_RSA_WITH_RC4_128_SHA',
      'TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA',
      'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256',
      'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256'
    )
    and handshake_completed
  group by
    address
)
select
  d.domain as resource,
  case
    when i.address is null
    or i.count < 1 then 'ok'
    else 'alarm'
  end as status,
  case
    when i.address is null
    or i.count < 1 then d.domain || ' uses secure cipher suites.'
    else d.domain || ' does not use secure cipher suites.'
  end as reason
from
  domain_list as d
  left join check_insecure_cipher as i on d.address = i.address;