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#!/bin/bash
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# Copyright (C) 2023 Thien Tran
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
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#Please note that this is how I PERSONALLY setup my computer - I do some stuff such as not using anything to download GNOME extensions from extensions.gnome.org and installing the extensions as a package instead
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output( ) {
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echo -e '\e[36m' " $1 " '\e[0m' ;
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}
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unpriv( ) {
sudo -u nobody " $@ "
}
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#Compliance and updates
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sudo systemctl mask debug-shell.service
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#sudo ua enable usg
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sudo apt update -y
sudo apt full-upgrade -y
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#sudo apt install -y usg
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sudo apt autoremove -y
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#sudo usg fix cis_level2_workstation
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# Make home directory private
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sudo chmod 700 /home/*
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# Remove AIDE
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#sudo apt purge -y aide*
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# Allow su which is disabled by CIS
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sudo sed -i 's/auth required pam_wheel.so use_uid group=sugroup//g' /etc/pam.d/su
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# Setting umask to 077
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umask 077
sudo sed -ie '/^DIR_MODE=/ s/=[0-9]*\+/=0700/' /etc/adduser.conf
sudo sed -ie '/^UMASK\s\+/ s/022/077/' /etc/login.defs
sudo sed -i 's/USERGROUPS_ENAB yes/USERGROUPS_ENAB no/g' /etc/login.defs
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echo 'umask 077' | sudo tee --append /etc/profile
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# Setup NTS
sudo systemctl disable systemd-timesyncd
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sudo apt install -y curl chrony
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unpriv curl https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/chrony.conf | sudo tee /etc/chrony/chrony.conf
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sudo systemctl restart chronyd
# Setup UFW
#UFW Snap is strictly confined, unlike its .deb counterpart
sudo apt purge -y ufw
sudo snap install ufw
sudo ufw enable
# Harden SSH
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echo ' GSSAPIAuthentication no
VerifyHostKeyDNS yes' | sudo tee -a /etc/ssh/ssh_config.d/10-custom.conf
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sudo chmod 644 /etc/ssh/ssh_config.d/10-custom.conf
# Kernel hardening
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unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/modprobe.d/30_security-misc.conf | sudo tee /etc/modprobe.d/30_security-misc.conf
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sudo chmod 644 /etc/modprobe.d/30_security-misc.conf
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unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/990-security-misc.conf | sudo tee /etc/sysctl.d/990-security-misc.conf
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sudo chmod 644 /etc/sysctl.d/990-security-misc.conf
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unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/30_silent-kernel-printk.conf | sudo tee /etc/sysctl.d/30_silent-kernel-printk.conf
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sudo chmod 644 /etc/sysctl.d/30_silent-kernel-printk.conf
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unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/30_security-misc_kexec-disable.conf | sudo tee /etc/sysctl.d/30_security-misc_kexec-disable.conf
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sudo chmod 644 /etc/sysctl.d/30_security-misc_kexec-disable.conf
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sudo sed -i 's/kernel.yama.ptrace_scope=2/kernel.yama.ptrace_scope=3/g' /etc/sysctl.d/990-security-misc.conf
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sudo sysctl -p
# Rebuild initramfs
sudo update-initramfs -u
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# Systemd Hardening
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sudo mkdir -p /etc/systemd/system/NetworkManager.service.d
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unpriv curl https://gitlab.com/divested/brace/-/raw/master/brace/usr/lib/systemd/system/NetworkManager.service.d/99-brace.conf | sudo tee /etc/systemd/system/NetworkManager.service.d/99-brace.conf
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sudo mkdir -p /etc/systemd/system/irqbalance.service.d
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unpriv curl https://gitlab.com/divested/brace/-/raw/master/brace/usr/lib/systemd/system/irqbalance.service.d/99-brace.conf | sudo tee /etc/systemd/system/irqbalance.service.d/99-brace.conf
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# Disable automount
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unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Script/main/etc/dconf/db/local.d/automount-disable | sudo tee /etc/dconf/db/local.d/automount-disable
unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Script/main/etc/dconf/db/local.d/locks/automount-disable | sudo tee /etc/dconf/db/local.d/locks/automount-disable
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unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/dconf/db/local.d/prefer-dark | sudo tee /etc/dconf/db/local.d/prefer-dark
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sudo dconf update
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# Disable crash reports
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echo ' [ com/ubuntu/update-notifier]
show-apport-crashes= false' | sudo tee /etc/dconf/db/local.d/disable-apport-crashes
echo 'com/ubuntu/update-notifier/show-apport-crashes' | sudo tee /etc/dconf/db/local.d/locks/disable-apport-crashes
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sudo dconf update
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ubuntu-report -f send no
sudo systemctl stop apport.service
sudo systemctl disable apport.service
sudo systemctl mask apport.service
sudo systemctl stop whoopsie.service
sudo systemctl disable whoopsie.service
sudo systemctl mask whoopsie.service
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# Update packages and firmware
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sudo apt update -y
sudo apt full-upgrade -y
sudo fwupdmgr get-devices
sudo fwupdmgr refresh --force
sudo fwupdmgr get-updates -y
sudo fwupdmgr update -y
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# Remove unneeded packages
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sudo apt purge -y cups* eog gedit firefox* gnome-calculator gnome-characters* gnome-font-viewer gnome-logs gnome-power-manager gnome-shell-extension-prefs seahorse tcpdump whoopsie
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sudo apt autoremove -y
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sudo snap remove firefox
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# Install packages that I use
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sudo apt install -y git-core gnome-text-editor
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sudo snap install eog
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# Setup Networking
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unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Script/main/etc/NetworkManager/conf.d/00-macrandomize.conf | sudo tee /etc/NetworkManager/conf.d/00-macrandomize.conf
unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Script/main/etc/NetworkManager/conf.d/01-transient-hostname.conf | sudo tee /etc/NetworkManager/conf.d/01-transient-hostname.conf
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sudo nmcli general reload conf
sudo hostnamectl hostname 'localhost'
sudo hostnamectl --transient hostname ''
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# Enable fstrim.timer
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sudo apt install tuned -y
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sudo systemctl enable --now fstrim.timer
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#Enable Titlebar buttons
gsettings set org.gnome.desktop.wm.preferences button-layout 'appmenu:minimize,maximize,close'