Verify Group Who Owns /var/log/syslog File

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Description

To properly set the group owner of /var/log/syslog, run the command:

$ sudo chgrp adm /var/log/syslog

Rationale

The /var/log/syslog file contains logs of error messages in the system and should only be accessed by authorized personnel.

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

# Remediation is applicable only in certain platforms
if dpkg-query --show --showformat='${db:Status-Status}' 'rsyslog' 2>/dev/null | grep -q '^installed$'; then

if getent group "4" >/dev/null 2>&1; then
  newgroup="4"
fi
if [[ -z ${newgroup} ]]; then
  echo "4 is not a defined group on the system"
  exit 1
fi
chgrp $newgroup /var/log/syslog

else
    >&2 echo 'Remediation is not applicable, nothing was done'
fi

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - DISA-STIG-UBTU-20-010420
  - configure_strategy
  - file_groupowner_var_log_syslog
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Set the file_groupowner_var_log_syslog_newgroup variable if represented by
    gid
  set_fact:
    file_groupowner_var_log_syslog_newgroup: '4'
  when: '"rsyslog" in ansible_facts.packages'
  tags:
  - DISA-STIG-UBTU-20-010420
  - configure_strategy
  - file_groupowner_var_log_syslog
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Test for existence /var/log/syslog
  stat:
    path: /var/log/syslog
  register: file_exists
  when: '"rsyslog" in ansible_facts.packages'
  tags:
  - DISA-STIG-UBTU-20-010420
  - configure_strategy
  - file_groupowner_var_log_syslog
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure group owner on /var/log/syslog
  file:
    path: /var/log/syslog
    group: '{{ file_groupowner_var_log_syslog_newgroup }}'
  when:
  - '"rsyslog" in ansible_facts.packages'
  - file_exists.stat is defined and file_exists.stat.exists
  tags:
  - DISA-STIG-UBTU-20-010420
  - configure_strategy
  - file_groupowner_var_log_syslog
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed