Control: 3.23 Ensure that the Containerd socket file ownership is set to root:root

Description

You should verify that the Containerd socket file is owned by root and group owned by root.

Containerd is an underlying component used by Docker to create and manage containers. It provides a socket file similar to the Docker socket, which must be protected from unauthorized access. If any other user or process owns this socket, it might be possible for that non-privileged user or process to interact with the Containerd daemon. Additionally, in this case a non-privileged user or process might be able to interact with containers which is neither a secure nor desired behavior.

Unlike the Docker socket, there is usually no requirement for non-privileged users to connect to the socket, so the ownership should be root:root.

Remediation

You should execute the following command

chown root:root /run/containerd/containerd.sock

This sets the ownership to root and group ownership to root for the default Containerd socket file.

Default Value

By default, the ownership and group ownership for the Containerd socket file is correctly set to root:root

Usage

Run the control in your terminal:

powerpipe control run docker_compliance.control.cis_v160_3_23

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run docker_compliance.control.cis_v160_3_23 --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 %U:%G /run/containerd/containerd.sock | grep -v root:root'
)
select
  host as resource,
  case
    when os.os ilike '%Darwin%' then 'skip'
    when o.stdout_output = '' then 'ok'
    else 'alarm'
  end as status,
  case
    when os.os ilike '%Darwin%' then host || ' /run/containerd/containerd.sock does not exist on ' || os.os || ' OS.'
    when o.stdout_output = '' then host || ' containerd socket file is owned by root and group owned by root.'
    else host || ' containerd socket file is not owned by root.'
  end as reason
  , h._ctx ->> 'connection_name' as connection_name
from
  hostname as h,
  os_output as os,
  linux_output as o
where
  os.os_conn = h.host_conn
  and h.host_conn = o.conn;

Control: 3.23 Ensure that the Containerd socket file ownership is set to root:root

Description

Remediation

Default Value

Usage

SQL

Tags