#!/bin/bash

# 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.

#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
#Customize it to your liking
#Run this script as your admin user, NOT root

#Variables
USER=$(whoami)
PARTITIONID=$(sudo cat /etc/crypttab | awk '{print $1}')
PARTITIONUUID=$(sudo blkid -s UUID -o value /dev/mapper/"${PARTITIONID}")

output(){
    echo -e '\e[36m'$1'\e[0m';
}

# Moving to the home directory
#Note that I always use /home/${USER} because gnome-terminal is wacky and sometimes doesn't load the environment variables in correctly (Right click somewhere in nautilus, click on open in terminal, then hit create new tab and you will see.)
cd /home/"${USER}" || exit

# Setting umask to 077
umask 077
sudo sed -i 's/umask 022/umask 077/g' /etc/bashrc
echo "umask 077" | sudo tee -a /etc/bashrc

# Make home directory private
chmod 700 /home/*

# Setup NTS
sudo rm -rf /etc/chrony/chrony.conf
sudo curl https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/chrony.conf -o /etc/chrony/chrony.conf
echo '# Command-line options for chronyd
OPTIONS="-F 1"' | sudo tee /etc/sysconfig/chronyd

sudo systemctl restart chronyd

# Setup Networking
echo -e '[device]\nwifi.scan-rand-mac-address=yes\n\n[connection]\nwifi.cloned-mac-address=random\nethernet.cloned-mac-address=random' | sudo tee /etc/NetworkManager/conf.d/99-random-mac.conf
echo -e '[main]\nhostname-mode=none' | sudo tee /etc/NetworkManager/conf.d/01-transient-hostname.conf
sudo nmcli general reload conf
sudo hostnamectl hostname 'localhost'
sudo hostnamectl --transient hostname ''
sudo firewall-cmd --set-default-zone=block
sudo firewall-cmd --permanent --add-service=dhcpv6-client
sudo firewall-cmd --reload
sudo firewall-cmd --lockdown-on

# Harden SSH
echo "GSSAPIAuthentication no" | sudo tee /etc/ssh/ssh_config.d/10-custom.conf
echo "VerifyHostKeyDNS yes" | sudo tee -a /etc/ssh/ssh_config.d/10-custom.conf
sudo chmod 644 /etc/ssh/ssh_config.d/10-custom.conf

# Security kernel settings
sudo curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/modprobe.d/30_security-misc.conf -o /etc/modprobe.d/30_security-misc.conf
sudo curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/sysctl.d/30_security-misc.conf -o /etc/sysctl.d/30_security-misc.conf
sudo curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/sysctl.d/30_silent-kernel-printk.conf -o /etc/sysctl.d/30_silent-kernel-printk.conf
sudo curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/sysctl.d/30_security-misc_kexec-disable.conf -o /etc/sysctl.d/30_security-misc_kexec-disable.conf
sudo sed -i 's/kernel.yama.ptrace_scope=2/kernel.yama.ptrace_scope=1/g' /etc/sysctl.d/30_security-misc.conf
sudo grubby --update-kernel=ALL --args='spectre_v2=on spec_store_bypass_disable=on l1tf=full,force mds=full,nosmt tsx=off tsx_async_abort=full,nosmt kvm.nx_huge_pages=force nosmt=force l1d_flush=on mmio_stale_data=full,nosmt random.trust_bootloader=off random.trust_cpu=off intel_iommu=on amd_iommu=on efi=disable_early_pci_dma iommu.passthrough=0 iommu.strict=1 slab_nomerge init_on_alloc=1 init_on_free=1 pti=on vsyscall=none page_alloc.shuffle=1 randomize_kstack_offset=on extra_latent_entropy debugfs=off'
sudo dracut -f
sudo sysctl -p

# Systemd Hardening
sudo mkdir -p /etc/systemd/system/NetworkManager.service.d
sudo curl https://gitlab.com/divested/brace/-/raw/master/brace/usr/lib/systemd/system/NetworkManager.service.d/99-brace.conf -o /etc/systemd/system/NetworkManager.service.d/99-brace.conf
sudo mkdir -p /etc/systemd/system/irqbalance.service.d
sudo curl https://gitlab.com/divested/brace/-/raw/master/brace/usr/lib/systemd/system/irqbalance.service.d/99-brace.conf -o /etc/systemd/system/irqbalance.service.d/99-brace.conf

sudo systemctl restart NetworkManager
sudo systemctl restart irqbalance

# Disable automount
echo '[org/gnome/desktop/media-handling]
automount=false
automount-open=false' | sudo tee /etc/dconf/db/local.d/automount-disable

echo 'org/gnome/desktop/media-handling/automount
org/gnome/desktop/media-handling/automount-open' | sudo tee /etc/dconf/db/local.d/locks/automount-disable

sudo dconf update

# Setup ZRAM
echo -e '[zram0]\nzram-fraction = 1\nmax-zram-size = 8192\ncompression-algorithm = zstd' | sudo tee /etc/systemd/zram-generator.conf

# Speed up DNF
echo -e 'fastestmirror=1\nmax_parallel_downloads=10\ndeltarpm=False\ndefaultyes=True\ninstall_weak_deps=False\ncountme=False' | sudo tee -a /etc/dnf/dnf.conf
sudo sed -i 's/^metalink=.*/&\&protocol=https/g' /etc/yum.repos.d/*

# Update packages and firmware
sudo dnf upgrade -y
sudo fwupdmgr get-devices
sudo fwupdmgr refresh --force
sudo fwupdmgr get-updates -y
sudo fwupdmgr update -y

# Remove unneeded packages
sudo dnf -y remove fedora-bookmarks fedora-chromium-config firefox mozilla-filesystem \
    #Network + hardware tools
    *cups nmap-ncat nfs-utils nmap-ncat openssh-server net-snmp-libs net-tools opensc traceroute rsync tcpdump teamd geolite2* mtr dmidecode sgpio \
    #Remove support for some languages and spelling
    ibus-typing-booster *speech* *zhuyin* *pinyin* *kkc* *m17n* *hangul* *anthy* words \
    #Remove codec + image + printers
    openh264 ImageMagick* sane* simple-scan \
    #Remove Active Directory + Sysadmin + reporting tools
    sssd* realmd adcli cyrus-sasl-plain cyrus-sasl-gssapi mlocate quota* dos2unix kpartx sos abrt \
    #Remove vm and virtual stuff
    podman* *libvirt* open-vm* qemu-guest-agent hyperv* spice-vdagent virtualbox-guest-additions vino xorg-x11-drv-vmware xorg-x11-drv-amdgpu \
    #NetworkManager
    NetworkManager-pptp-gnome NetworkManager-ssh-gnome NetworkManager-openconnect-gnome NetworkManager-openvpn-gnome NetworkManager-vpnc-gnome ppp* ModemManager\
    #Remove Gnome apps
    gnome-photos gnome-connections gnome-tour gnome-themes-extra gnome-screenshot gnome-remote-desktop gnome-font-viewer gnome-calculator gnome-calendar gnome-contacts \
    gnome-maps gnome-weather gnome-logs gnome-boxes gnome-disk-utility gnome-clocks gnome-color-manager gnome-characters baobab totem \
    gnome-shell-extension-background-logo gnome-shell-extension-apps-menu gnome-shell-extension-horizontal-workspaces gnome-shell-extension-launch-new-instance gnome-shell-extension-places-menu gnome-shell-extension-window-list \
    gnome-classic* gnome-user* gnome-text-editor chrome-gnome-shell eog \
    #Remove apps
    rhythmbox yelp evince libreoffice* cheese file-roller* mediawriter \
    #other
    lvm2 rng-tools thermald *perl* yajl

# Disable openh264 repo
sudo dnf config-manager --set-disabled fedora-cisco-openh264

# Install packages that I use
sudo dnf -y install gnome-console git-core gnome-shell-extension-appindicator gnome-shell-extension-blur-my-shell gnome-shell-extension-background-logo gnome-shell-extension-dash-to-dock gnome-shell-extension-no-overview

# Enable auto TRIM
sudo systemctl enable fstrim.timer

# Setup BTRFS layout and Timeshift
sudo mkdir /btrfs_pool
sudo mount -o subvolid=5 /dev/mapper/${PARTITIONID} /btrfs_pool
sudo mv /btrfs_pool/root /btrfs_pool/@
sudo mv /btrfs_pool/home /btrfs_pool/@home
sudo btrfs subvolume list /btrfs_pool
sudo sed -i 's/subvol=root/subvol=@,ssd,noatime,space_cache,commit=120,compress=zstd:1,discard=async/' /etc/fstab
sudo sed -i 's/subvol=home/subvol=@home,ssd,noatime,space_cache,commit=120,compress=zstd:1,discard=async/' /etc/fstab
sudo echo "UUID=${PARTITIONUUID} /btrfs_pool             btrfs   subvolid=5,ssd,noatime,space_cache,commit=120,compress=zstd:1,discard=async,x-systemd.device-timeout=0   0 0" | sudo tee -a /etc/fstab
sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
sudo dnf -y install timeshift

## The script is done. You can also remove gnome-terminal since gnome-console will replace it.