147 lines
5.4 KiB
Bash
147 lines
5.4 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-05-05; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.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.live.builder
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# SPDX-Security-Contact: security@coresecret.eu
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set -Ceuo pipefail
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"
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cd /root
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cp -u /etc/fail2ban/fail2ban.conf /root/.ciss/dlb/backup/fail2ban.conf.bak
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chmod 0644 /root/.ciss/dlb/backup/fail2ban.conf.bak
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### https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1024305
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sed -i 's/#allowipv6 = auto/allowipv6 = auto/1' /etc/fail2ban/fail2ban.conf
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mv /etc/fail2ban/jail.d/defaults-debian.conf /root/.ciss/dlb/backup/defaults-debian.conf.bak
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chmod 0644 /root/.ciss/dlb/backup/defaults-debian.conf.bak
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cat << 'EOF' >| /etc/fail2ban/jail.d/centurion-default.conf
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-05-05; WEIDNER, Marc S.; <cendev@coresecret.eu>
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# SPDX-ExternalRef: GIT https://cendev.eu/marc.weidner/CISS.2025.debian.live.builder.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.; <cendev@coresecret.eu>
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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.live.builder
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# SPDX-Security-Contact: security@coresecret.eu
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[DEFAULT]
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usedns = yes
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# local | vpn
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ignoreip = 127.0.0.0/8 ::1 MUST_BE_SET
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maxretry = 8
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findtime = 24h
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bantime = 24h
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### SSH Handling: Foreign IP (not in /etc/hosts.allow): refused to connect: immediate ban [sshd-refused]
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### Jump host mistyped 1-3 times: no ban, only after four attempts [sshd]
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[sshd]
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enabled = true
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backend = systemd
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filter = sshd
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mode = normal
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port = MUST_BE_SET
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protocol = tcp
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logpath = /var/log/auth.log
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maxretry = 4
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findtime = 24h
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bantime = 24h
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[sshd-refused]
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enabled = true
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filter = sshd-refused
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port = MUST_BE_SET
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protocol = tcp
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logpath = /var/log/auth.log
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maxretry = 1
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findtime = 24h
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bantime = 24h
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# ufw aggressive approach:
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# Any valid client communicating with our server should be going directly to the service ports opened in ufw (ssh, 80, 443, ...).
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# Any client touching other ports is treated as malicious and therefore should be blocked access to ALL ports after one attempt.
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[ufw]
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enabled = true
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filter = ufw.aggressive
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action = iptables-allports
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logpath = /var/log/ufw.log
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maxretry = 1
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findtime = 24h
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bantime = 24h
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protocol = tcp,udp
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EOF
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cat << EOF >| /etc/fail2ban/filter.d/ufw.aggressive.conf
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[Definition]
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failregex = ^.*UFW BLOCK.* SRC=<HOST> .*DPT=\d+ .*
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EOF
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cat << EOF >| /etc/fail2ban/filter.d/sshd-refused.conf
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[Definition]
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failregex = ^refused connect from \S+ \(<HOST>\)
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EOF
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###########################################################################################
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# Remarks: hardening of fail2ban systemd #
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###########################################################################################
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# https://wiki.archlinux.org/title/fail2ban#Service_hardening #
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# The CapabilityBoundingSet parameters CAP_DAC_READ_SEARCH will allow Fail2ban full read #
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# access to every directory and file. CAP_NET_ADMIN and CAP_NET_RAW allow Fail2ban to #
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# operate # on any firewall that has a command-line shell interface. By using #
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# ProtectSystem=strict the filesystem hierarchy will only be read-only; ReadWritePaths #
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# allows Fail2ban to have write access on required paths. #
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###########################################################################################
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mkdir -p /etc/systemd/system/fail2ban.service.d
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mkdir /var/log/fail2ban
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cat << 'EOF' >| /etc/systemd/system/fail2ban.service.d/override.conf
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[Service]
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PrivateDevices=yes
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PrivateTmp=yes
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ProtectHome=read-only
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ProtectSystem=strict
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ReadWritePaths=-/var/run/fail2ban
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ReadWritePaths=-/var/lib/fail2ban
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ReadWritePaths=-/var/log/fail2ban
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ReadWritePaths=-/var/spool/postfix/maildrop
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ReadWritePaths=-/run/xtables.lock
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CapabilityBoundingSet=CAP_AUDIT_READ CAP_DAC_READ_SEARCH CAP_NET_ADMIN CAP_NET_RAW
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### Added by CISS.debian.live.builder
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ProtectClock=true
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ProtectHostname=true
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EOF
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cat << 'EOF' >> /etc/fail2ban/fail2ban.local
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[Definition]
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logtarget = /var/log/fail2ban/fail2ban.log
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EOF
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###########################################################################################
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# Remarks: Logrotate must be updated either #
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###########################################################################################
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cp -a /etc/logrotate.d/fail2ban /root/.ciss/dlb/backup/fail2ban_logrotate.bak
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sed -i 's/\/var\/log\/fail2ban.log/\/var\/log\/fail2ban\/fail2ban.log/1' /etc/logrotate.d/fail2ban
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touch /var/log/fail2ban/fail2ban.log
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chmod 640 /var/log/fail2ban/fail2ban.log
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"
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exit 0
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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