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V8.00.000.2025.06.17
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
This commit is contained in:
Marc S. Weidner
2025-09-05 17:15:05 +02:00
parent 2e83b6a7cc
commit 4c89e79afc
23 changed files with 942 additions and 332 deletions
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85
func/cdi_4400_hardening/4470_hardening_ufw.sh Normal file
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#!/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
#######################################
# OpenSSL library defaults (system-wide), TLSv1.2-, TLSv1.3-, AES-256-only;
# Globals:
# TARGET
# VAR_SETUP_PATH
# Arguments:
# None
# Returns:
# 0: on success
#######################################
hardening_ufw() {
### Declare Arrays, HashMaps, and Variables.
declare -r var_logfile="/root/.ciss/cdi/log/4470_hardening_ufw.log"
chroot_logger "${TARGET}${var_logfile}"
if [[ ! -f "${TARGET}/var/log/ufw.log" ]]; then
touch "${TARGET}/var/log/ufw.log"
chmod 640 "${TARGET}/var/log/ufw.log"
fi
chroot_script "${TARGET}" "
ufw --force reset
ufw logging medium
ufw default deny incoming
ufw default ${VAR_UFW_OUT} outgoing
ufw default deny forward
ufw allow in ${VAR_SSH_PORT}/tcp comment 'Incoming SSH'
ufw limit ${VAR_SSH_PORT}/tcp comment 'Incoming SSH'
"
### Ensure that a standard set of the most commonly used ports are open if a default-'deny'-outbound policy is selected.
if [[ "${VAR_UFW_OUT}" = "deny" ]]; then
chroot_script "${TARGET}" "
ufw allow out 21/tcp comment 'Outgoing FTP'
ufw allow out 22/tcp comment 'Outgoing SSH'
ufw allow out 25/tcp comment 'Outgoing SMTP'
ufw allow out 53/tcp comment 'Outgoing DNS'
ufw allow out 80/tcp comment 'Outgoing HTTP'
ufw allow out 123/tcp comment 'Outgoing NTP'
ufw allow out 143/tcp comment 'Outgoing IMAP'
ufw allow out 443/tcp comment 'Outgoing HTTPS'
ufw allow out 465/tcp comment 'Outgoing SMTPS'
ufw allow out 587/tcp comment 'Outgoing SMTPS'
ufw allow out 993/tcp comment 'Outgoing IMAPS'
ufw allow out 4460/tcp comment 'Outgoing NTS'
ufw allow out ${VAR_SSH_PORT}/tcp comment 'Outgoing SSH'
ufw allow out 53/udp comment 'Outgoing DNS'
ufw allow out 123/udp comment 'Outgoing NTP'
ufw allow out 443/udp comment 'Outgoing QUIC'
ufw allow out 853/udp comment 'Outgoing DoQ'
"
fi
### Allowing ICMP IPv4 outgoing per default.
sed -i "/# ok icmp code for FORWARD/i \# ok icmp codes for OUTPUT" "${TARGET}/etc/ufw/before.rules"
sed -i "/# ok icmp code for FORWARD/i \-A ufw-before-output -p icmp --icmp-type destination-unreachable -j ACCEPT" "${TARGET}/etc/ufw/before.rules"
sed -i "/# ok icmp code for FORWARD/i \-A ufw-before-output -p icmp --icmp-type time-exceeded -j ACCEPT" "${TARGET}/etc/ufw/before.rules"
sed -i "/# ok icmp code for FORWARD/i \-A ufw-before-output -p icmp --icmp-type parameter-problem -j ACCEPT" "${TARGET}/etc/ufw/before.rules"
sed -i "/# ok icmp code for FORWARD/i \-A ufw-before-output -p icmp --icmp-type echo-request -j ACCEPT" "${TARGET}/etc/ufw/before.rules"
chroot_script "${TARGET}" "echo 'y' | ufw enable 2>&1"
chroot_script "${TARGET}" "
ufw status verbose >> ${var_logfile}
"
guard_dir && return 0
}
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh