#!/bin/sh # Copyright (C) 2021-2024 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 output(){ printf '\e[1;34m%-6s\e[m\n' "${@}" } unpriv(){ sudo -u nobody "$@" } virtualization=$(systemd-detect-virt) # Compliance sudo systemctl mask debug-shell.service sudo 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/* # Setup NTS sudo dnf install -y chrony unpriv curl -s https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/chrony.conf | sudo tee /etc/chrony.conf > /dev/null sudo chmod 644 /etc/chrony.conf unpriv curl -s https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysconfig/chronyd | sudo tee /etc/sysconfig/chronyd > /dev/null sudo chmod 644 /etc/sysconfig/chronyd sudo systemctl restart chronyd # Remove nullok sudo /usr/bin/sed -i 's/\s+nullok//g' /etc/pam.d/system-auth # Harden SSH 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 sudo chmod 644 /etc/ssh/sshd_config.d/10-custom.conf 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 sudo chmod 644 /etc/ssh/ssh_config.d/10-custom.conf sudo mkdir -p /etc/systemd/system/sshd.service.d/ sudo chmod 755 /etc/systemd/system/sshd.service.d/ unpriv curl -s https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/systemd/system/sshd.service.d/local.conf | sudo tee /etc/systemd/system/sshd.service.d/override.conf > /dev/null sudo systemctl daemon-reload sudo systemctl restart sshd # Security kernel settings 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 sudo chmod 644 /etc/modprobe.d/server-blacklist.conf 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 sudo chmod 644 /etc/sysctl.d/99-server.conf sudo dracut -f sudo sysctl -p sudo grubby --update-kernel=ALL --args='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 lockdown=confidentiality module.sig_enforce=1 console=tty0 console=ttyS0,115200' # Disable coredump 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 sudo chmod 644 /etc/security/limits.d/30-disable-coredump.conf sudo mkdir -p /etc/systemd/coredump.conf.d 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 sudo chmod 644 /etc/systemd/coredump.conf.d/disable.conf # Setup DNF unpriv curl -s https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/dnf/dnf.conf | sudo tee /etc/dnf/dnf.conf > /dev/null sudo chmod 644 /etc/dnf/dnf.conf sudo sed -i 's/^metalink=.*/&\&protocol=https/g' /etc/yum.repos.d/* # Setup automatic updates sudo dnf install -y dnf-automatic sudo sed -i 's/apply_updates = no/apply_updates = yes\nreboot = when-needed/g' /etc/dnf/automatic.conf sudo systemctl enable --now dnf-automatic.timer # Remove unnecessary packages sudo dnf remove -y cockpit* # Install 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 # Install appropriate virtualization drivers if [ "$virtualization" = 'kvm' ]; then sudo dnf install -y qemu-guest-agent fi # Setup unbound sudo dnf install unbound -y echo 'server: chroot: "" auto-trust-anchor-file: "/var/lib/unbound/root.key" trust-anchor-signaling: yes root-key-sentinel: yes tls-cert-bundle: "/etc/ssl/cert.pem" tls-ciphers: "PROFILE=SYSTEM" hide-http-user-agent: yes hide-identity: yes hide-trustanchor: yes hide-version: yes deny-any: yes harden-algo-downgrade: yes harden-large-queries: yes harden-referral-path: yes ignore-cd-flag: yes max-udp-size: 3072 module-config: "validator iterator" qname-minimisation-strict: yes unwanted-reply-threshold: 10000000 use-caps-for-id: yes outgoing-port-permit: 1024-65535 prefetch: yes prefetch-key: yes # ip-transparent: yes # interface: 127.0.0.1 # interface: ::1 # interface: 242.242.0.1 # access-control: 242.242.0.0/16 allow forward-zone: name: "." forward-tls-upstream: yes forward-addr: 1.1.1.2@853#security.cloudflare-dns.com forward-addr: 1.0.0.2@853#security.cloudflare-dns.com forward-addr: 2606:4700:4700::1112@853#security.cloudflare-dns.com forward-addr: 2606:4700:4700::1002@853#security.cloudflare-dns.com' | sudo tee /etc/unbound/unbound.conf sudo chmod 644 /etc/unbound/unbound.conf sudo mkdir -p /etc/systemd/system/unbound.service.d unpriv curl -s https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/systemd/system/unbound.service.d/override.conf | sudo tee /etc/systemd/system/unbound.service.d/override.conf > /dev/null sudo chmod 644 /etc/systemd/system/unbound.service.d/override.conf sudo systemctl enable --now unbound # Setup yara #sudo dnf install -y yara #sudo insights-client --collector malware-detection #sudo sed -i 's/test_scan: true/test_scan: false/' /etc/insights-client/malware-detection-config.yml # Enable auto TRIM sudo systemctl enable fstrim.timer ### Differentiating bare metal and virtual installs # Setup fwupd if [ "$virtualization" = 'none' ]; then sudo dnf install -y fwupd echo 'UriSchemes=file;https' | sudo tee -a /etc/fwupd/fwupd.conf sudo systemctl restart fwupd mkdir -p /etc/systemd/system/fwupd-refresh.service.d unpriv curl -s https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/systemd/system/fwupd-refresh.service.d/override.conf | sudo tee /etc/systemd/system/fwupd-refresh.service.d/override.conf > /dev/null sudo chmod 644 /etc/systemd/system/fwupd-refresh.service.d/override.conf sudo systemctl daemon-reload sudo systemctl enable --now fwupd-refresh.timer fi # Setup tuned sudo dnf install -y tuned sudo systemctl enable --now tuned if [ "$virtualization" = 'none' ]; then sudo tuned-adm profile latency-performance else sudo tuned-adm profile virtual-guest fi # Setup networking sudo systemctl enable --now firewalld sudo firewall-cmd --permanent --remove-service=cockpit sudo firewall-cmd --reload sudo firewall-cmd --lockdown-on sudo mkdir -p /etc/systemd/system/NetworkManager.service.d unpriv curl -s https://gitlab.com/divested/brace/-/raw/master/brace/usr/lib/systemd/system/NetworkManager.service.d/99-brace.conf | sudo tee /etc/systemd/system/NetworkManager.service.d/99-brace.conf > /dev/null sudo chmod 644 /etc/systemd/system/NetworkManager.service.d/99-brace.conf sudo systemctl daemon-reload sudo systemctl restart NetworkManager # irqbalance hardening sudo mkdir -p /etc/systemd/system/irqbalance.service.d unpriv curl -s https://gitlab.com/divested/brace/-/raw/master/brace/usr/lib/systemd/system/irqbalance.service.d/99-brace.conf | sudo tee /etc/systemd/system/irqbalance.service.d/99-brace.conf > /dev/null sudo chmod 644 /etc/systemd/system/irqbalance.service.d/99-brace.conf sudo systemctl daemon-reload sudo systemctl restart irqbalance # Setup notices unpriv curl -s https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/issue | sudo tee /etc/issue > /dev/null sudo chmod 644 /etc/issue unpriv curl -s https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/issue | sudo tee /etc/issue.net > /dev/null sudo chmod 644 /etc/issue.net # Final notes to the user output 'Server setup complete. To use unbound for DNS, you need to run the following commands:' output 'nmcli con mod ipv4.dns 127.0.0.1' output 'nmcli con mod ipv6.dns ::1'