Ensure journald is configured to write log files to persistent disk

An XCCDF Rule

Description

The journald system may store log files in volatile memory or locally on disk. If the logs are only stored in volatile memory they will we lost upon reboot.

Rationale

Log files contain valuable data and need to be persistent to aid in possible investigations.

ID: xccdf_org.ssgproject.content_rule_journald_storage
Severity: Medium
References: 4.2.2.3

CCE-91378-0
Updated: over 1 year ago

- name: Gather the package facts
  package_facts:
    manager: auto
  tags:
  - CCE-91378-0
  - journald_storage  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

- name: Ensure journald is configured to write log files to persistent disk - Search
    for a section in files
  ansible.builtin.find:
    paths: '{{item.path}}'
    patterns: '{{item.pattern}}'
    contains: ^\s*\[Journal\]
    read_whole_file: true
    use_regex: true
  register: systemd_dropin_files_with_section
  loop:
  - path: '{{ ''/etc/systemd/journald.conf'' | dirname }}'
    pattern: '{{ ''/etc/systemd/journald.conf'' | basename | regex_escape }}'
  - path: /etc/systemd/journal.d
    pattern: .*\.conf
  when: '"kernel-default" in ansible_facts.packages'
  tags:
  - CCE-91378-0
  - journald_storage
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

- name: Ensure journald is configured to write log files to persistent disk - Count
    number of files which contain the correct section
  ansible.builtin.set_fact:
    count_of_systemd_dropin_files_with_section: '{{systemd_dropin_files_with_section.results
      | map(attribute=''matched'') | list | map(''int'') | sum}}'
  when: '"kernel-default" in ansible_facts.packages'
  tags:
  - CCE-91378-0
  - journald_storage
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

- name: Ensure journald is configured to write log files to persistent disk - Add
    missing configuration to correct section
  ini_file:
    path: '{{item}}'
    section: Journal
    option: Storage
    value: persistent
    state: present
    no_extra_spaces: true
  when:
  - '"kernel-default" in ansible_facts.packages'
  - count_of_systemd_dropin_files_with_section | int > 0
  loop: '{{systemd_dropin_files_with_section.results | sum(attribute=''files'', start=[])
    | map(attribute=''path'') | list }}'
  tags:
  - CCE-91378-0
  - journald_storage
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

- name: Ensure journald is configured to write log files to persistent disk - Add
    configuration to new remediation file
  ini_file:
    path: /etc/systemd/journal.d/complianceascode_hardening.conf
    section: Journal
    option: Storage
    value: persistent
    state: present
    no_extra_spaces: true
    create: true
  when:
  - '"kernel-default" in ansible_facts.packages'
  - count_of_systemd_dropin_files_with_section | int == 0
  tags:
  - CCE-91378-0
  - journald_storage
  - low_complexity
  - low_disruption
  - medium_severity
  - no_reboot_needed
  - restrict_strategy

# Remediation is applicable only in certain platforms
if rpm --quiet -q kernel-default; then

found=false

# set value in all files if they contain section or keyfor f in $(echo -n "/etc/systemd/journal.d/complianceascode_hardening.conf /etc/systemd/journal.d/*.conf /etc/systemd/journald.conf"); do
    if [ ! -e "$f" ]; then
        continue
    fi

    # find key in section and change value
    if grep -qzosP "[[:space:]]*\[Journal\]([^\n\[]*\n+)+?[[:space:]]*Storage" "$f"; then

            sed -i "s/Storage[^(\n)]*/Storage=persistent/" "$f"

            found=true

    # find section and add key = value to it
    elif grep -qs "[[:space:]]*\[Journal\]" "$f"; then

            sed -i "/[[:space:]]*\[Journal\]/a Storage=persistent" "$f"

            found=true
    fi
done

# if section not in any file, append section with key = value to FIRST file in files parameter
if ! $found ; then
    file=$(echo "/etc/systemd/journal.d/complianceascode_hardening.conf /etc/systemd/journal.d/*.conf /etc/systemd/journald.conf" | cut -f1 -d ' ')
    mkdir -p "$(dirname "$file")"

    echo -e "[Journal]\nStorage=persistent" >> "$file"

fi

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

Ensure journald is configured to write log files to persistent disk

Description

Rationale

Remediation - Ansible

Remediation - Shell Script