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GNU GENERAL PUBLIC LICENSE
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# Base Stack
Base Stack installs some basic applications and configs that are common to any server build. Specifically firewald & fail2ban to lock a server down.
## Install
```
cd /usr/local/src/
git clone https://git.stack-source.com/msb/base-stack.git
cd base-stack
bash install.sh
```
## License
Copyright (c) 2022 Matthew Saunders Brown <matthewsaundersbrown@gmail.com>\
GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

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# Fail2Ban configuration file
#
# Author: Matthew Saunders Brown
# Modified from dummy.conf by Cyril Jaquier
#
#
[Definition]
# Option: actionstart
# Notes.: command executed on demand at the first ban (or at the start of Fail2Ban if actionstart_on_demand is set to false).
# Values: CMD
#
actionstart =
# Option: actionflush
# Notes.: command executed once to flush (clear) all IPS, by shutdown (resp. by stop of the jail or this action)
# Values: CMD
#
actionflush = nft flush set inet firewalld fail2ban
# Option: actionstop
# Notes.: command executed at the stop of jail (or at the end of Fail2Ban)
# Values: CMD
#
actionstop =
# Option: actioncheck
# Notes.: command executed once before each actionban command
# Values: CMD
#
actioncheck =
# Option: actionban
# Notes.: command executed when banning an IP. Take care that the
# command is executed with Fail2Ban user rights.
# Tags: See jail.conf(5) man page
# Values: CMD
#
actionban = nft add element inet firewalld fail2ban { <ip> }
# Option: actionunban
# Notes.: command executed when unbanning an IP. Take care that the
# command is executed with Fail2Ban user rights.
# Tags: See jail.conf(5) man page
# Values: CMD
#
actionunban = nft delete element inet firewalld fail2ban { <ip> }

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[Definition]
dbfile = :memory:

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# Fail2Ban configuration file.
[DEFAULT]
ignoreip = 127.0.0.1/8
banaction = firewallcmd-nftset

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#!/bin/bash
#
# base-stack
# https://git.stack-source.com/msb/base-stack
# Copyright (c) 2022 Matthew Saunders Brown <matthewsaundersbrown@gmail.com>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
#
# this installer expects a clean Ubuntu 20.04 install
# require root
if [ "${EUID}" -ne 0 ]; then
echo "This script must be run as root"
exit 1
fi
# do some basic pre-install checks - these are *not* exhaustive
os_id=`lsb_release -is`
os_release=`lsb_release -rs`
if [ $os_id != Ubuntu ] || [ $os_release != 22.04 ]; then
echo "this installer only runs on Ubuntu 22.04, bailing out"
exit 1
fi
# set webmaster email address, used below
WEBMASTER=webmaster@`hostname -d`
# have packages automatically start/restart/stop after install/upgrade/uninstall
if [[ -f /etc/needrestart/needrestart.conf ]]; then
sed -i "s|^#\$nrconf{restart} = 'i';|\$nrconf{restart} = 'a';|g" /etc/needrestart/needrestart.conf
fi
if [[ -f /usr/sbin/policy-rc.d ]]; then
sed -i "s|exit 101|exit 0|g" /usr/sbin/policy-rc.d
fi
# update system
DEBIAN_FRONTEND=noninteractive apt-get -y update
# update grub first, by itself, as it requires special overrides to run unattended
DEBIAN_FRONTEND=noninteractive apt-get -y -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" install grub-common grub2-common grub-pc grub-pc-bin
DEBIAN_FRONTEND=noninteractive apt-get -y dist-upgrade
DEBIAN_FRONTEND=noninteractive apt-get -y autoremove
# remove unwanted packages
DEBIAN_FRONTEND=noninteractive apt-get -y purge snapd cryptsetup ufw iptables landscape-common popularity-contest
## used to disable apparmor, going to try leaving it in now
# aa-teardown
# systemctl stop apparmor
# systemctl disable apparmor
# disable motd
sed -i 's|ENABLED=1|ENABLED=0|g' /etc/default/motd-news
chmod 644 /etc/update-motd.d/10-help-text
# configure unattended upgrades with automatic reboots
DEBIAN_FRONTEND=noninteractive apt-get -y install unattended-upgrades
sed -i 's|^APT::Periodic::Update-Package-Lists.*|APT::Periodic::Update-Package-Lists "1";|g' /etc/apt/apt.conf.d/10periodic
sed -i 's|^APT::Periodic::Download-Upgradeable-Packages.*|APT::Periodic::Download-Upgradeable-Packages "1";|g' /etc/apt/apt.conf.d/10periodic
sed -i 's|^APT::Periodic::AutocleanInterval.*|APT::Periodic::AutocleanInterval "7";|g' /etc/apt/apt.conf.d/10periodic
sed -i 's|^APT::Periodic::Update-Package-Lists.*|APT::Periodic::Update-Package-Lists "1";|g' /etc/apt/apt.conf.d/20auto-upgrades
sed -i 's|^APT::Periodic::Unattended-Upgrade.*|APT::Periodic::Unattended-Upgrade "1";|g' /etc/apt/apt.conf.d/20auto-upgrades
sed -i 's|// "${distro_id}:${distro_codename}-updates";| "${distro_id}:${distro_codename}-updates";|g' /etc/apt/apt.conf.d/50unattended-upgrades
sed -i 's|//Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";|Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";|g' /etc/apt/apt.conf.d/50unattended-upgrades
sed -i 's|//Unattended-Upgrade::Remove-Unused-Dependencies "false";|Unattended-Upgrade::Remove-Unused-Dependencies "true";|g' /etc/apt/apt.conf.d/50unattended-upgrades
sed -i 's|//Unattended-Upgrade::Automatic-Reboot "false";|Unattended-Upgrade::Automatic-Reboot "true";|g' /etc/apt/apt.conf.d/50unattended-upgrades
# between 1:00 and 1:55am
REBOOT_TIME=01:$(printf "%02d" $((0 + RANDOM % 55)))
sed -i "s|//Unattended-Upgrade::Automatic-Reboot-Time \"02:00\";|Unattended-Upgrade::Automatic-Reboot-Time \"$REBOOT_TIME\";|g" /etc/apt/apt.conf.d/50unattended-upgrades
sed -i "s|//Unattended-Upgrade::Mail \"\";|Unattended-Upgrade::Mail \"$WEBMASTER\";|g" /etc/apt/apt.conf.d/50unattended-upgrades
# firewalld
# without "--no-install-recommends" ipset and ipables are pulled in, and we don't need or want those
DEBIAN_FRONTEND=noninteractive apt-get -y install firewalld --no-install-recommends
firewall-cmd --set-default-zone=public
# get public interface (e.g. eth0, enp0s10, etc.) then add it to the default (public) zone
INTERFACE=$(/usr/bin/ip route get 1.1.1.1 | sed -n 's/.*dev \([^\ ]*\).*/\1/p')
firewall-cmd --permanent --zone=public --add-interface=$INTERFACE
# ssh should already be enabled by default, just making sure
firewall-cmd --permanent --zone=public --add-service=ssh
# default firewalld public zone enables dhcpv6-client, we don't want that
firewall-cmd --permanent --zone=public --remove-service=dhcpv6-client
# blacklist - for local blacklisting
firewall-cmd --permanent --new-ipset=blacklist --type=hash:net
firewall-cmd --permanent --ipset=blacklist --set-short=Blacklist
firewall-cmd --permanent --ipset=blacklist --set-description="Blacklist IP set for creating blacklists local to this server. Use fbl.sh & fwl.sh to add/remove IPs to the blacklist."
firewall-cmd --permanent --zone=drop --add-source=ipset:blacklist
# fail2ban - fail2ban blocking
firewall-cmd --permanent --new-ipset=fail2ban --type=hash:ip --option=timeout=90000
# 90000 timeout is 25 hours. Assumption is that 24 hours is the longest ban that fail2ban will implement, timeout is in place as a backup to remove out of date IPs
firewall-cmd --permanent --ipset=fail2ban --set-short=Fail2Ban
firewall-cmd --permanent --ipset=fail2ban --set-description="IP set for use by fail2ban. IPs in this set get added to the Drop zone."
firewall-cmd --permanent --zone=drop --add-source=ipset:fail2ban
systemctl restart firewalld
# fail2ban
DEBIAN_FRONTEND=noninteractive apt-get -y install fail2ban
chmod 644 fail2ban/*/*
cp -a fail2ban/* /etc/fail2ban/
systemctl enable fail2ban
systemctl start fail2ban
# adjust journald config to prevent /var/log/journal/... from using excessive disk space
sed -i 's|.*SystemMaxUse=.*|SystemMaxUse=1G|g' /etc/systemd/journald.conf
sed -i 's|.*RuntimeMaxUse=.*|RuntimeMaxUse=1G|g' /etc/systemd/journald.conf
sed -i 's|.*SystemMaxFiles=.*|SystemMaxFiles=10|g' /etc/systemd/journald.conf
sed -i 's|.*RuntimeMaxFiles=.*|RuntimeMaxFiles=10|g' /etc/systemd/journald.conf
sed -i 's|.*MaxRetentionSec=.*|MaxRetentionSec=1week|g' /etc/systemd/journald.conf
systemctl restart systemd-journald.service
# install some handy extra packages
DEBIAN_FRONTEND=noninteractive apt-get -y install gdu exa pwgen
# install
chmod 750 sbin/*
cp sbin/* /usr/local/sbin/
echo ""
echo "Unattended upgrades are configured to send notifications to $WEBMASTER."
echo "Update Unattended-Upgrade::Mail in /etc/apt/apt.conf.d/50unattended-upgrades to suit your needs."

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#!/bin/bash
aa-status
aa-teardown
systemctl stop apparmor
systemctl disable apparmor
aa-status

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#!/bin/bash
# IP should be first arg
if [ -n "$1" ]; then
IP=$1
else
echo "IP not set"
exit 1
fi
LAST_LINE=`grep -i "ban $IP" /var/log/fail2ban.log|tail -1`
if [ -z "$LAST_LINE" ]; then
# no bans found, doing search for Found
LAST_LINE=`grep "Found $IP" /var/log/fail2ban.log|tail -1`
if [ -z "$LAST_LINE" ]; then
echo "No matches for $IP"
exit
fi
fi
ACTION=`echo $LAST_LINE|awk '{ print $7 }'`
FILTER=`echo $LAST_LINE|awk -F'[][]' '{ print $4 }'`
if [ $ACTION = 'Ban' ] || [ $ACTION = 'Restore' ]; then
echo "unbanning & whitelisting $FILTER:$IP"
fail2ban-client set $FILTER unbanip $IP
fail2ban-client set $FILTER addignoreip $IP
elif [ $ACTION = 'Unban' ]; then
echo "$FILTER:$IP already autounbanned, whitelisting now"
fail2ban-client set $FILTER addignoreip $IP
elif [ $ACTION = 'Found' ]; then
echo "$IP not banned, but Found $FILTER:$IP, whitelisting now"
fail2ban-client set $FILTER addignoreip $IP
fi

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#!/bin/bash
# IP should be first arg
if [ -n "$1" ]; then
IP=$1
else
echo "IP not set"
exit 1
fi
if [[ firewall-cmd --ipset=blacklist --query-entry $IP >/dev/null ]]; then
echo "IP $IP already in blacklist. Doing nothing."
else
firewall-cmd --ipset=blacklist --add-entry=$IP
firewall-cmd --permanent --ipset=blacklist --add-entry=$IP
fi

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#!/bin/bash
# IP should be first arg
if [ -n "$1" ]; then
IP=$1
else
echo "IP not set"
exit 1
fi
if [[ firewall-cmd --ipset=blacklist --query-entry $IP >/dev/null ]]; then
firewall-cmd --ipset=blacklist --remove-entry=$IP
firewall-cmd --permanent --ipset=blacklist --remove-entry=$IP
else
echo "IP $IP not in blacklist. Doing nothing."
fi

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#!/bin/bash
err="not enough RAM to write swap back, nothing done"
mem=`free|grep Mem:|awk '{print $4}'`
swap=`free|grep Swap:|awk '{print $3}'`
test $mem -lt $swap && echo -e $err && exit 1
/sbin/swapoff -a && /sbin/swapon -a &&
exit 0