#!/bin/sh

# Copyright (C) 2022-2024 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.

set -eu

unpriv(){
  sudo -u nobody "$@"
}

# Compliance
sudo systemctl mask debug-shell.service

# Setting umask to 077
# Does not actually work for some reason - need to check
umask 077
sudo sed -i 's/^UMASK.*/UMASK 077/g' /etc/login.defs
sudo sed -i 's/^HOME_MODE/#HOME_MODE/g' /etc/login.defs
sudo sed -i 's/umask 022/umask 077/g' /etc/bashrc

# Make home directory private
sudo chmod 700 /home/*

# Harden SSH
unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/ssh/ssh_config.d/10-custom.conf | sudo tee /etc/ssh/ssh_config.d/10-custom.conf > /dev/null
sudo chmod 644 /etc/ssh/ssh_config.d/10-custom.conf

# Disable coredump
unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/security/limits.d/30-disable-coredump.conf | sudo tee /etc/security/limits.d/30-disable-coredump.conf > /dev/null

# Setup dconf
umask 022
mkdir -p /etc/dconf/db/local.d/locks

unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/dconf/db/local.d/locks/automount-disable | sudo tee /etc/dconf/db/local.d/locks/automount-disable > /dev/null
unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/dconf/db/local.d/locks/privacy | sudo tee /etc/dconf/db/local.d/locks/privacy > /dev/null

unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/dconf/db/local.d/adw-gtk3-dark | sudo tee /etc/dconf/db/local.d/adw-gtk3-dark > /dev/null
unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/dconf/db/local.d/automount-disable | sudo tee /etc/dconf/db/local.d/automount-disable > /dev/null
unpriv curl -s --proxy http://127.0.0.1:8082 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 > /dev/null
unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/dconf/db/local.d/privacy | sudo tee /etc/dconf/db/local.d/privacy > /dev/null

sudo dconf update
umask 077

# Avoid phased updates
unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/apt/apt.conf.d/99sane-upgrades | sudo tee /etc/apt/apt.conf.d/99sane-upgrades > /dev/null
sudo chmod 644 /etc/apt/apt.conf.d/99sane-upgrades


sudo apt update -y
sudo apt full-upgrade -y
sudo apt autoremove -y

# Debloat

# Remove unnecessary stuff from the Qubes template
sudo apt purge -y gnome-software thunderbird keepassxc

# Remove Network + hardware tools packages
sudo apt purge -y avahi* cups* '*nfs*' rygel '*smtp*' system-config-printer* '*telnet*'

# Remove support for some languages and spelling
sudo apt purge -y '*speech*'

# Remove codec + image + printers
sudo apt purge -y ImageMagick* sane* simple-scan

# Remove Active Directory + Sysadmin + reporting tools
sudo apt purge -y realmd

# Remove unnecessary network tools
sudo apt purge -y ifupdown mobile-broadband-provider-info modemmanager

# Remove Gnome apps
sudo apt purge -y baobab chrome-gnome-shell eog gnome-calculator gnome-calendar gnome-characters gnome-clocks gnome-color-manager \
    gnome-contacts gnome-disk-utility gnome-font-viewer gnome-logs gnome-maps gnome-music gnome-remote-desktop gnome-shell-extensions \
    gnome-sound-recorder gnome-tweaks gnome-user-share gnome-weather totem

# Remove apps
sudo apt purge -y cheese evince evolution file-roller* firefox* libreoffice* seahorse shotwell synaptic* rhythmbox yelp

# Remove other packages
sudo apt purge -y cron lvm2 lynx '*vmware*' xserver-xephyr xsettingsd

sudo apt autoremove -y
sudo apt autoclean

# Add console group
sudo groupadd --system console
sudo usermod -aG console user

# Add extrepo
sudo apt install -y extrepo

# Adding KickSecure's repo
sudo http_proxy=http://127.0.0.1:8082 https_proxy=http://127.0.0.1:8082 extrepo enable kicksecure

# Distribution morphing
sudo apt update
sudo apt full-upgrade -y
sudo apt install --no-install-recommends kicksecure-qubes-cli -y
sudo apt autoremove -y
sudo repository-dist --enable --repository stable-proposed-updates
sudo extrepo disable kicksecure
sudo mv /etc/apt/sources.list ~/
sudo touch /etc/apt/sources.list

#Enabling SUID Disabler and Permission Hardener
sudo systemctl enable --now permission-hardening

# Restrict /proc and access
sudo systemctl enable --now proc-hidepid.service

# Reduce kernel information leaks
# Will break a lot of applications. The apps I use on KickSecure work fine with it so I am enabling it.
sudo systemctl enable --now hide-hardware-info.service

# Install packages
sudo apt install --no-install-recommends adw-gtk3-theme gnome-console loupe qubes-ctap qubes-gpg-split -y

# Flatpak update service
unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/QubesOS-Scripts/main/etc/systemd/user/update-user-flatpaks.service | sudo tee /etc/systemd/user/update-user-flatpaks.service > /dev/null
unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/QubesOS-Scripts/main/etc/systemd/user/update-user-flatpaks.timer | sudo tee /etc/systemd/user/update-user-flatpaks.timer > /dev/null