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Require Client SMB Packet Signing, if using smbclient

An XCCDF Rule

Description

To require samba clients running smbclient to use packet signing, add the following to the [global] section of the Samba configuration file, /etc/samba/smb.conf: 

client signing = mandatory
Requiring samba clients such as smbclient to use packet signing ensures they can only communicate with servers that support packet signing.

Rationale

Packet signing can prevent man-in-the-middle attacks which modify SMB packets in transit.

ID
xccdf_org.ssgproject.content_rule_require_smb_client_signing
Severity
Unknown
Updated



Remediation - Ansible

- name: Check if /etc/samba/smb.conf exists
  stat:
    path: /etc/samba/smb.conf
  register: st_smb
  tags:
  - configure_strategy

Remediation - Shell Script

######################################################################
#By Luke "Brisk-OH" Brisk
#luke.brisk@boeing.com or luke.brisk@gmail.com
######################################################################

CLIENTSIGNING=$( grep -ic 'client signing' /etc/samba/smb.conf )