Verify User Who Owns /var/log/syslog File

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Description

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

$ sudo chown syslog /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

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-20-010421
  - configure_strategy
  - file_owner_var_log_syslog
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Check that the syslog user is defined
  getent:
    database: passwd
    key: syslog
  ignore_errors: true
  when: '"rsyslog" in ansible_facts.packages'
  tags:
  - DISA-STIG-UBTU-20-010421
  - configure_strategy
  - file_owner_var_log_syslog
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Set the file_owner_var_log_syslog_newown variable if syslog found
  set_fact:
    file_owner_var_log_syslog_newown: syslog
  when:
  - '"rsyslog" in ansible_facts.packages'
  - ansible_facts.getent_passwd["syslog"] is defined
  tags:
  - DISA-STIG-UBTU-20-010421
  - configure_strategy
  - file_owner_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-20-010421
  - configure_strategy
  - file_owner_var_log_syslog
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed

- name: Ensure owner on /var/log/syslog
  file:
    path: /var/log/syslog
    owner: '{{ file_owner_var_log_syslog_newown }}'
  when:
  - '"rsyslog" in ansible_facts.packages'
  - file_exists.stat is defined and file_exists.stat.exists
  tags:
  - DISA-STIG-UBTU-20-010421
  - configure_strategy
  - file_owner_var_log_syslog
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed