Marc S. Weidner
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
96 lines
2.6 KiB
Bash
96 lines
2.6 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.git
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# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
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# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-FileType: SOURCE
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# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
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# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
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# SPDX-PackageName: CISS.debian.installer
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# SPDX-Security-Contact: security@coresecret.eu
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guard_sourcing
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#######################################
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# Hardening '/etc/logrotate'.
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# Globals:
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# RECOVERY
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# TARGET
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# VAR_RUN_RECOVERY
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# Arguments:
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# None
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# Returns:
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# 0: on success
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#######################################
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hardening_logrotate() {
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### Declare Arrays, HashMaps, and Variables.
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declare var_target="${TARGET}"
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### Check for TARGET / RECOVERY.
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[[ "${VAR_RUN_RECOVERY}" == "true" ]] && var_target="${RECOVERY}"
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rm -f "${var_target}/etc/logrotate.conf"
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insert_header "${var_target}/etc/logrotate.conf"
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insert_comments "${var_target}/etc/logrotate.conf"
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cat << EOF >> "${var_target}/etc/logrotate.conf"
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# See "man logrotate" for details. Global options do not affect preceding include directives.
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# Rotate log files daily
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daily
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# Keep 384 daily worth of backlogs.
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rotate 384
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# Hard cap: delete rotated logs older than 384 days.
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maxage 384
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# Do not rotate the log if it is empty (this overrides the ifempty option).
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notifempty
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# Create new (empty) log files after rotating old ones.
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create
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# Use date as a suffix of the rotated file.
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dateext
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# Use yesterday's instead of today's date to create the dateext extension, so that the rotated log file has a date in its name
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# that is the same as the timestamps within it.
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dateyesterday
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# Enable compression
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compress
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# Use zstd instead of gzip.
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compresscmd /usr/bin/zstd
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# File extension for compressed logs.
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compressext .zst
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# Set zstd level 3 (default).
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compressoptions -20
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# How to decompress for 'logrotate -d' or similar.
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uncompresscmd /usr/bin/unzstd
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# Keep the most recent rotation uncompressed for one cycle.
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delaycompress
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# Delete log files using shred -u instead of unlink().
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shred
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# packages drop log rotation information into this directory
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include /etc/logrotate.d
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# system-specific logs may also be configured here.
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=conf
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EOF
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guard_dir && return 0
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}
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### Prevents accidental 'unset -f'.
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# shellcheck disable=SC2034
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readonly -f hardening_logrotate
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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