#!/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 systemctl mask debug-shell.service systemctl mask kdump.service # Setting umask to 077 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/* # Disable timesyncd systemctl disable --now systemd-timesyncd systemctl mask systemd-timesyncd # 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 | tee /etc/ssh/ssh_config.d/10-custom.conf > /dev/null chmod 644 /etc/ssh/ssh_config.d/10-custom.conf # Security kernel settings unpriv curl -s --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/secureblue/secureblue/live/config/files/usr/etc/modprobe.d/blacklist.conf | sudo tee /etc/modprobe.d/workstation-blacklist.conf > /dev/null sudo chmod 644 /etc/modprobe.d/workstation-blacklist.conf unpriv curl -s --proxy https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysctl.d/99-workstation.conf | sudo tee /etc/sysctl.d/99-workstation.conf > /dev/null sudo chmod 644 /etc/sysctl.d/30_security-misc_kexec-disable.conf # Dracut doesn't seem to work - need to investigate # dracut -f sudo sysctl -p # Setup ZRAM unpriv curl --proxy http://127.0.0.1:8082 https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/systemd/zram-generator.conf | sudo tee /etc/systemd/zram-generator.conf > /dev/null # Setup hardened_malloc sudo dnf copr enable secureblue/hardened_malloc -y sudo dnf install -y hardened_malloc echo 'libhardened_malloc.so' | sudo tee /etc/ld.so.preload sudo chmod 644 /etc/ld.so.preload