2024-06-26 01:24:45 -04:00
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#!/bin/sh
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2023-07-04 04:24:28 -04:00
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2024-01-20 03:09:48 -05:00
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# Copyright (C) 2021-2024 Thien Tran
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2023-09-27 03:56:28 -04:00
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations under
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# the License.
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2023-12-01 21:54:20 -05:00
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#Meant to be run on Ubuntu Pro Minimal
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2023-07-04 04:24:28 -04:00
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2024-07-20 21:23:38 -04:00
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set -eu
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2024-07-02 19:48:15 -04:00
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2023-12-01 21:54:20 -05:00
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output(){
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2024-06-26 01:24:45 -04:00
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printf '\e[1;34m%-6s\e[m\n' "${@}"
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2023-12-01 21:54:20 -05:00
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}
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2023-12-02 06:56:58 -05:00
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unpriv(){
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2024-06-26 01:24:45 -04:00
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sudo -u nobody "$@"
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2023-12-02 06:56:58 -05:00
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}
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2024-05-29 17:52:09 -04:00
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virtualization=$(systemd-detect-virt)
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2024-01-20 01:48:59 -05:00
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# Compliance and updates
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2023-12-12 03:20:52 -05:00
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sudo systemctl mask debug-shell.service
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2023-12-13 13:24:46 -05:00
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echo 'Authorized uses only. All activity may be monitored and reported.' | sudo tee /etc/issue
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echo 'Authorized uses only. All activity may be monitored and reported.' | sudo tee /etc/issue.net
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2023-12-12 03:20:52 -05:00
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2024-05-29 15:27:45 -04:00
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# Setting umask to 077
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umask 077
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sudo sed -i 's/^UMASK.*/UMASK 077/g' /etc/login.defs
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sudo sed -i 's/^HOME_MODE/#HOME_MODE/g' /etc/login.defs
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sudo sed -i 's/^USERGROUPS_ENAB.*/USERGROUPS_ENAB no/g' /etc/login.defs
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2024-05-29 15:43:53 -04:00
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# Make home directory private
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sudo chmod 700 /home/*
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2023-08-16 06:22:28 -04:00
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# Setup NTS
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2023-08-22 20:46:56 -04:00
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sudo systemctl disable --now systemd-timesyncd
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2024-04-28 16:44:01 -04:00
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sudo systemctl mask systemd-timesyncd
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2023-08-16 06:22:28 -04:00
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sudo apt install -y chrony
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2024-07-03 05:23:28 -04:00
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unpriv curl -s https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/chrony.conf | sudo tee /etc/chrony/chrony.conf > /dev/null
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2024-06-06 01:18:53 -04:00
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sudo chmod 644 /etc/chrony/chrony.conf
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2023-08-16 06:22:28 -04:00
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sudo systemctl restart chronyd
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# Harden SSH
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2024-07-03 05:23:28 -04:00
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unpriv curl -s https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/ssh/sshd_config.d/10-custom.conf | sudo tee /etc/ssh/sshd_config.d/10-custom.conf > /dev/null
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2023-09-22 18:09:36 -04:00
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sudo chmod 644 /etc/ssh/sshd_config.d/10-custom.conf
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2024-07-03 05:23:28 -04:00
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unpriv curl -s 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
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2024-02-07 11:52:52 -05:00
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sudo chmod 644 /etc/ssh/ssh_config.d/10-custom.conf
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2024-07-26 07:59:01 -04:00
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sudo mkdir -p /etc/systemd/system/sshd.service.d/
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sudo chmod 755 /etc/systemd/system/sshd.service.d/
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2024-07-03 05:23:28 -04:00
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unpriv curl -s https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/systemd/system/sshd.service.d/local.conf | sudo tee /etc/systemd/system/ssh.service.d/override.conf > /dev/null
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2024-06-06 01:18:53 -04:00
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sudo chmod 644 /etc/systemd/system/ssh.service.d/override.conf
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2023-08-16 06:22:28 -04:00
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sudo systemctl daemon-reload
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2024-05-04 20:09:07 -04:00
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sudo systemctl restart ssh
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2023-07-31 04:34:49 -04:00
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2024-06-04 08:33:52 -04:00
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# Security kernel settings
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2024-07-26 07:59:01 -04:00
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unpriv curl -s https://raw.githubusercontent.com/secureblue/secureblue/live/files/system/usr/etc/modprobe.d/blacklist.conf | sudo tee /etc/modprobe.d/server-blacklist.conf > /dev/null
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2024-06-04 08:33:52 -04:00
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sudo chmod 644 /etc/modprobe.d/server-blacklist.conf
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2024-07-03 05:23:28 -04:00
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unpriv curl -s https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysctl.d/99-server.conf | sudo tee /etc/sysctl.d/99-server.conf > /dev/null
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2024-06-04 08:33:52 -04:00
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sudo chmod 644 /etc/sysctl.d/99-server.conf
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2023-12-13 13:24:46 -05:00
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sudo sysctl -p
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# Rebuild initramfs
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sudo update-initramfs -u
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2024-02-13 19:16:33 -05:00
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# Disable coredump
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2024-07-03 05:23:28 -04:00
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unpriv curl -s 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
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2024-06-06 01:18:53 -04:00
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sudo chmod 644 /etc/security/limits.d/30-disable-coredump.conf
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2024-06-04 17:29:50 -04:00
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sudo mkdir -p /etc/systemd/coredump.conf.d
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2024-06-06 01:18:53 -04:00
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sudo chmod 755 /etc/systemd/coredump.conf.d
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2024-07-03 05:23:28 -04:00
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unpriv curl -s 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 > /dev/null
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2024-06-06 01:18:53 -04:00
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sudo chmod 644 /etc/systemd/coredump.conf.d/disable.conf
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2024-02-13 19:16:33 -05:00
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2024-01-21 03:23:50 -05:00
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# Update GRUB config
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if [ ! -d /boot/efi/EFI/ZBM ]; then
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2024-03-25 15:41:40 -04:00
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# shellcheck disable=SC2016
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2024-07-03 11:18:57 -04:00
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sudo sed -i 's/splash/splash 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 console=tty0 console=ttyS0,115200/g' /etc/default/grub
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2024-01-21 03:23:50 -05:00
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sudo update-grub
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fi
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2023-12-13 13:24:46 -05:00
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# Disable telemetry
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2024-05-07 02:31:30 -04:00
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sudo systemctl disable --now apport.service
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2023-12-13 13:24:46 -05:00
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sudo systemctl mask apport.service
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2024-05-17 05:49:31 -04:00
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## Avoid phased updates
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sudo apt install -y curl
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2024-07-03 05:23:28 -04:00
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unpriv curl -s 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
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2024-05-17 05:49:31 -04:00
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sudo chmod 644 /etc/apt/apt.conf.d/99sane-upgrades
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sudo apt update -y
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sudo apt full-upgrade -y
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sudo apt autoremove -y
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## Install basic sysadmin tools
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2024-05-29 17:52:09 -04:00
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sudo apt install -y nano iputils-ping
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2024-05-17 05:49:31 -04:00
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2024-05-29 17:52:09 -04:00
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# Install appropriate virtualization drivers
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if [ "$virtualization" = 'kvm' ]; then
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sudo apt install -y qemu-guest-agent
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fi
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2023-12-13 13:24:46 -05:00
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# Enable fstrim.timer
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sudo systemctl enable --now fstrim.timer
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### Differentiating bare metal and virtual installs
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# Setup tuned
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2024-05-29 17:59:14 -04:00
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sudo apt install -y tuned
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sudo systemctl enable --now tuned
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2024-05-29 17:52:09 -04:00
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if [ "$virtualization" = 'none' ]; then
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2024-05-29 17:59:14 -04:00
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sudo tuned-adm profile latency-performance
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2023-12-13 13:24:46 -05:00
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else
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sudo tuned-adm profile virtual-guest
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2023-12-13 13:24:46 -05:00
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fi
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# Setup fwupd
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2024-05-29 17:52:09 -04:00
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if [ "$virtualization" = 'none' ]; then
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2024-05-29 17:59:14 -04:00
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sudo apt install -y fwupd
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echo 'UriSchemes=file;https' | sudo tee -a /etc/fwupd/fwupd.conf
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sudo systemctl restart fwupd
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mkdir -p /etc/systemd/system/fwupd-refresh.service.d
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2024-07-03 05:23:28 -04:00
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unpriv curl -s https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/systemd/system/fwupd-refresh.service.d/override.conf | sudo tee /etc/systemd/system/fwupd-refresh.service.d/override.conf > /dev/null
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2024-06-06 01:18:53 -04:00
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sudo chmod 644 /etc/systemd/system/fwupd-refresh.service.d/override.conf
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2024-05-29 17:59:14 -04:00
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sudo systemctl daemon-reload
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sudo systemctl enable --now fwupd-refresh.timer
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2023-12-13 13:24:46 -05:00
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fi
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2024-06-25 01:07:02 -04:00
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# Setup unbound
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sudo apt install -y unbound dns-root-data
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echo 'server:
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trust-anchor-signaling: yes
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root-key-sentinel: yes
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tls-cert-bundle: /etc/ssl/certs/ca-certificates.crt
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hide-identity: yes
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hide-trustanchor: yes
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hide-version: yes
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deny-any: yes
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harden-algo-downgrade: yes
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harden-large-queries: yes
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harden-referral-path: yes
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ignore-cd-flag: yes
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max-udp-size: 3072
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module-config: "validator iterator"
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qname-minimisation-strict: yes
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unwanted-reply-threshold: 10000000
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use-caps-for-id: yes
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outgoing-port-permit: 1024-65535
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prefetch: yes
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prefetch-key: yes
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# ip-transparent: yes
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# interface: 127.0.0.1
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# interface: ::1
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# interface: 242.242.0.1
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# access-control: 242.242.0.0/16 allow
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forward-zone:
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name: "."
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forward-tls-upstream: yes
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forward-addr: 1.1.1.2@853#security.cloudflare-dns.com
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forward-addr: 1.0.0.2@853#security.cloudflare-dns.com
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forward-addr: 2606:4700:4700::1112@853#security.cloudflare-dns.com
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forward-addr: 2606:4700:4700::1002@853#security.cloudflare-dns.com' | sudo tee /etc/unbound/unbound.conf.d/custom.conf
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sudo chmod 644 /etc/unbound/unbound.conf.d/custom.conf
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2024-06-26 01:24:45 -04:00
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sudo mkdir -p /etc/systemd/system/unbound.service.d
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2024-07-03 05:23:28 -04:00
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unpriv curl -s https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/systemd/system/unbound.service.d/override-chroot.conf | sudo tee /etc/systemd/system/unbound.service.d/override.conf > /dev/null
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2024-06-25 01:07:02 -04:00
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sudo chmod 644 /etc/systemd/system/unbound.service.d/override.conf
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sudo systemctl daemon-reload
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sudo systemctl restart unbound
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sudo systemctl disable systemd-resolved
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2023-07-04 04:24:28 -04:00
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2024-05-29 20:48:45 -04:00
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# Setup networking
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2024-04-28 14:47:36 -04:00
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# UFW Snap is strictly confined, unlike its .deb counterpart
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sudo apt purge -y ufw
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2024-06-26 13:28:27 -04:00
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sudo apt install -y snapd
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2024-04-28 14:47:36 -04:00
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sudo snap install ufw
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2024-06-18 02:39:25 -04:00
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sudo ufw enable -y
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2024-04-28 14:47:36 -04:00
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sudo ufw allow SSH
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2023-12-26 05:12:16 -05:00
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sudo reboot
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