Control: 3.4 Ensure that docker.socket file permissions are set to 644 or more restrictive

Description

You should verify that the file permissions on the docker.socket file are correctly set to 644 or more restrictively.

The docker.socket file contains sensitive parameters that may alter the behavior of the Docker remote API. It should therefore be writeable only by root in order to ensure that it is not modified by less privileged users.

Remediation

Step 1: Find out the file location:

systemctl show -p FragmentPath docker.socket

Step 2: : If the file does not exist, this recommendation is not applicable. If the file does exist, you should execute the command below, including the correct file path to set the file permissions to 644. For example,

chmod 644 /usr/lib/systemd/system/docker.socket

Default Value

This file may not be present on the system and in that case, this recommendation is not applicable. By default, if the file is present, the permissions should be set to 644 or more restrictively.

Usage

Run the control in your terminal:

powerpipe control run docker_compliance.control.cis_v160_3_4

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run docker_compliance.control.cis_v160_3_4 --share

SQL

This control uses a named query:

with os_output as (
  select
    btrim(stdout_output, E' \n\r\t') as os,
    _ctx ->> 'connection_name' as os_conn
  from
    exec_command
  where
    command = 'uname -s'
), hostname as (
  select
    btrim(stdout_output, E' \n\r\t') as host,
    _ctx ->> 'connection_name' as host_conn,
    _ctx
  from
    exec_command
  where
    command = 'hostname'
),

linux_output as (
  select
    stdout_output,
    _ctx ->> 'connection_name' as conn
  from
    exec_command,
    os_output
  where
    os_conn = _ctx ->> 'connection_name'
    and command = 'stat -c %a "$(systemctl show -p FragmentPath docker.socket | awk -F''='' ''{print $2}'')"'
),
linux_file_location as (
  select
    stdout_output,
    _ctx ->> 'connection_name' as conn
  from
    exec_command,
    os_output
  where
    os_conn = _ctx ->> 'connection_name'
    and command = 'echo $(systemctl show -p FragmentPath docker.socket)'
)
select
  host as resource,
  case
    when os.os ilike '%Darwin%' then 'skip'
    when l.stdout_output = '' then 'skip'
    when o.stdout_output like '%644%' then 'ok'
    else 'alarm'
  end as status,
  case
    when os.os ilike '%Darwin%' then host || ' docker.socket does not exist on ' || os.os || ' OS.'
    when l.stdout_output = '' then host || ' recommendation is not applicable as the file is unavailable.'
    else  host || ' docker.socket file permission set to ' || (btrim(o.stdout_output, E' \n\r\t')) || '.'
  end as reason
  , h._ctx ->> 'connection_name' as connection_name
from
  hostname as h,
  os_output as os,
  linux_output as o,
  linux_file_location as l
where
  os.os_conn = h.host_conn
  and h.host_conn = o.conn
  and h.host_conn = l.conn;

Control: 3.4 Ensure that docker.socket file permissions are set to 644 or more restrictive

Description

Remediation

Default Value

Usage

SQL

Tags