#!/bin/bash
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.git
# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-FileType: SOURCE
# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
# SPDX-PackageName: CISS.debian.installer
# SPDX-Security-Contact: security@coresecret.eu

guard_sourcing

#######################################
# Hardening logrotate.
# Globals:
#   TARGET
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
hardening_logrotate() {
  ### Declare Arrays, HashMaps, and Variables.
  declare -ar ary_logrotate=( "alternatives" "apt" "btmp" "chrony" "dpkg" "fail2ban" "rkhunter" "ufw" "unattended-upgrades" "usbguard")
  declare     var_file="" var_log=""
  declare     var_target="${TARGET}"

  ### Check for TARGET / RECOVERY.
  [[ "${VAR_RUN_RECOVERY}" == "true" ]] && var_target="${RECOVERY}"

  rm -f           "${var_target}/etc/logrotate.conf"
  insert_header   "${var_target}/etc/logrotate.conf"
  insert_comments "${var_target}/etc/logrotate.conf"
  cat << EOF >>   "${var_target}/etc/logrotate.conf"
# See "man logrotate" for details. Global options do not affect preceding include directives.

# rotate log files daily
daily

# keep 128 daily worth of backlogs
rotate 128

# hard cap: delete rotated logs older than 384 days
maxage 384

# create new (empty) log files after rotating old ones
create

# use date as a suffix of the rotated file
dateext

# gzip older rotations
compress

# keep the most recent rotation uncompressed for one cycle
delaycompress

# packages drop log rotation information into this directory
include /etc/logrotate.d

# system-specific logs may also be configured here.

# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=conf
EOF

  for var_log in "${ary_logrotate[@]}"; do
    var_file="${var_target}/etc/logrotate.d/${var_log}"
    [[ -e "${var_file}" ]] || continue
    ### Replace leading 'monthly'/'weekly' directives with 'daily', preserving indentation and trailing comments.
    sed -E -i \
      -e 's/^([[:space:]]*)(monthly|weekly)([[:space:]]*)(#.*)?$/\1daily\3\4/' \
      -e 's/^([[:space:]]*)rotate([[:space:]]+[0-9]+)?([[:space:]]*)(#.*)?$/\1rotate 128\3\4/' \
      "${var_file}"
  done

  guard_dir && return 0
}
### Prevents accidental 'unset -f'.
# shellcheck disable=SC2034
readonly -f hardening_logrotate
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh