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#!/bin/bash
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# Copyright (C) 2021-2024 Thien Tran
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#
# 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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# You need to add either the non-subscription repo or the testing repo from the Proxmox WebUI after running this script.
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output( ) {
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echo -e '\e[36m' " $1 " '\e[0m' ;
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}
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# Compliance and updates
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systemctl mask debug-shell.service
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## Avoid phased updates
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curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/apt/apt.conf.d/99sane-upgrades | tee /etc/apt/apt.conf.d/99sane-upgrades
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chmod 644 /etc/apt/apt.conf.d/99sane-upgrades
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# Setup NTS
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rm -rf /etc/chrony/chrony.conf
curl https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/chrony.conf | tee /etc/chrony/chrony.conf
systemctl restart chronyd
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# Harden SSH
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curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/ssh/sshd_config.d/10-custom.conf | tee /etc/ssh/sshd_config.d/10-custom.conf
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chmod 644 /etc/ssh/sshd_config.d/10-custom.conf
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curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/ssh/ssh_config.d/10-custom.conf | tee /etc/ssh/ssh_config.d/10-custom.conf
chmod 644 /etc/ssh/ssh_config.d/10-custom.conf
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mkdir -p /etc/systemd/system/ssh.service.d
curl https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/systemd/system/sshd.service.d/local.conf | tee /etc/systemd/system/ssh.service.d/override.conf
systemctl daemon-reload
systemctl restart sshd
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# Setup repositories
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sed -i '1 {s/^/# /}' /etc/apt/sources.list.d/pve-enterprise.list
sed -i '1 {s/^/# /}' /etc/apt/sources.list.d/ceph.list
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echo ' deb https://deb.debian.org/debian/ bookworm main contrib non-free non-free-firmware
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deb https://deb.debian.org/debian-security/ bookworm-security main contrib non-free non-free-firmware
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deb https://deb.debian.org/debian/ bookworm-updates main contrib non-free non-free-firmware
deb https://deb.debian.org/debian/ bookworm-backports main contrib non-free non-free-firmware
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deb http://download.proxmox.com/debian/pve bookworm pve-no-subscription' | tee /etc/apt/sources.list
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echo 'deb http://download.proxmox.com/debian/ceph-quincy bookworm no-subscription' | tee -a /etc/apt/sources.list.d/ceph.list
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# Update packages
apt update
apt full-upgrade -y
apt autoremove -y
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# Install packages
apt install -y intel-microcode tuned fwupd dropbear-initramfs
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### This part assumes that you are using systemd-boot
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echo -e " mitigations=auto,nosmt spectre_v2=on spectre_bhi=on spec_store_bypass_disable=on tsx=off kvm.nx_huge_pages=force nosmt=force l1d_flush=on spec_rstack_overflow=safe-ret gather_data_sampling=force reg_file_data_sampling=on random.trust_bootloader=off random.trust_cpu=off intel_iommu=on amd_iommu=force_isolation efi=disable_early_pci_dma iommu=force iommu.passthrough=0 iommu.strict=1 slab_nomerge init_on_alloc=1 init_on_free=1 pti=on vsyscall=none ia32_emulation=0 page_alloc.shuffle=1 randomize_kstack_offset=on debugfs=off $( cat /etc/kernel/cmdline) " > /etc/kernel/cmdline
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proxmox-boot-tool refresh
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###
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# Kernel hardening
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curl https://raw.githubusercontent.com/secureblue/secureblue/live/config/files/usr/etc/modprobe.d/blacklist.conf | tee /etc/modprobe.d/server-blacklist.conf
chmod 644 /etc/modprobe.d/server-blacklist.conf
sed -i 's/kernel_io_uring_disable = 2/#ernel_io_uring_disable = 2/g'
curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysctl.d/99-server.conf | tee /etc/sysctl.d/99-server.conf
chmod 644 /etc/sysctl.d/99-server.conf
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sysctl -p
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# Rebuild initramfs
update-initramfs -u
# Disable coredump
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umask 022
unpriv curl 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
mkdir -p /etc/systemd/coredump.conf.d
unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/systemd/coredump.conf.d/disable.conf | sudo tee /etc/systemd/coredump.conf.d/disable.conf
umask 077
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# Harden SSH
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sed -i 's/#GSSAPIAuthentication no/GSSAPIAuthentication no/g' /etc/ssh/sshd_config
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# Setup automatic updates
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mkdir -p /etc/systemd/system/pve-daily-update.service.d
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echo ' [ Service]
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ExecStart = /usr/bin/pveupgrade' | tee /etc/systemd/system/pve-daily-update.service.d/override.conf
systemctl daemon-reload
systemctl enable --now pve-daily-update.timer
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mkdir -p /etc/systemd/system/fwupd-refresh.service.d
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echo ' [ Service]
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ExecStart = /usr/bin/fwupdmgr update' | tee /etc/systemd/system/fwupd-refresh.service.d/override.conf
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systemctl daemon-reload
systemctl enable --now fwupd-refresh.timer
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# Disable Nagging
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sed -Ezi.bak "s/(Ext.Msg.show\(\{\s+title: gettext\('No valid sub)/void\(\{ \/\/\1/g" /usr/share/javascript/proxmox-widget-toolkit/proxmoxlib.js
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systemctl restart pveproxy.service
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# Setup tuned
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tuned-adm profile virtual-host
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# Enable fstrim.timer
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systemctl enable --now fstrim.timer