From 2f5a5ab10a13035ab467bfcb6d95984d3050b27a Mon Sep 17 00:00:00 2001 From: Tommy Date: Fri, 3 May 2024 16:48:16 -0700 Subject: [PATCH] Add RHEL 9 Signed-off-by: Tommy --- RHEL-9.sh | 224 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 224 insertions(+) create mode 100644 RHEL-9.sh diff --git a/RHEL-9.sh b/RHEL-9.sh new file mode 100644 index 0000000..492b663 --- /dev/null +++ b/RHEL-9.sh @@ -0,0 +1,224 @@ +#!/bin/bash + +# 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. + +output(){ + echo -e '\e[36m'"$1"'\e[0m'; +} + +unpriv(){ + sudo -u nobody "$@" +} + +# Compliance +sudo systemctl mask debug-shell.service +sudo systemctl mask kdump.service + +# Setup NTS +unpriv curl https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/chrony.conf | sudo tee /etc/chrony.conf +unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysconfig/chronyd | sudo tee /etc/sysconfig/chronyd + +sudo systemctl restart chronyd + +# Make home directory private +sudo chmod 700 /home/* + +# Setup Firewalld + +sudo firewall-cmd --permanent --remove-service=cockpit +sudo firewall-cmd --reload +sudo firewall-cmd --lockdown-on + +# Remove nullok +sudo /usr/bin/sed -i 's/\s+nullok//g' /etc/pam.d/system-auth + +# Harden SSH +unpriv curl 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 +sudo chmod 644 /etc/ssh/sshd_config.d/10-custom.conf +unpriv curl 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 +sudo chmod 644 /etc/ssh/ssh_config.d/10-custom.conf +unpriv curl https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/systemd/system/sshd.service.d/local.conf | sudo tee /etc/systemd/system/sshd.service.d/override.conf +sudo systemctl daemon-reload +sudo systemctl restart sshd + +# Kernel hardening + +unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/modprobe.d/30_security-misc.conf | sudo tee /etc/modprobe.d/30_security-misc.conf +sudo sed -i 's/#install msr/install msr/g' /etc/modprobe.d/30_security-misc.conf +sudo sed -i 's/# install bluetooth/install bluetooth/g' /etc/modprobe.d/30_security-misc.conf +sudo sed -i 's/# install btusb/install btusb/g' /etc/modprobe.d/30_security-misc.conf +unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/990-security-misc.conf | sudo tee /etc/sysctl.d/10-security-misc.conf +sudo sed -i 's/kernel.yama.ptrace_scope=2/kernel.yama.ptrace_scope=3/g' /etc/sysctl.d/10-security-misc.conf +sudo sed -i 's/net.ipv4.icmp_echo_ignore_all=1/net.ipv4.icmp_echo_ignore_all=0/g' /etc/sysctl.d/10-security-misc.conf +sudo sed -i 's/net.ipv6.icmp.echo_ignore_all=1/net.ipv6.icmp.echo_ignore_all=0/g' /etc/sysctl.d/10-security-misc.conf +unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/30_silent-kernel-printk.conf | sudo tee /etc/sysctl.d/30_silent-kernel-printk.conf +unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/30_security-misc_kexec-disable.conf | sudo tee /etc/sysctl.d/30_security-misc_kexec-disable.conf +sudo dracut -f +sudo sysctl -p +sudo grubby --update-kernel=ALL --args='mitigations=auto,nosmt spectre_v2=on spec_store_bypass_disable=on tsx=off kvm.nx_huge_pages=force nosmt=force l1d_flush=on spec_rstack_overflow=safe-ret 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' + +# Disable coredump +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 + +# Systemd Hardening + +sudo mkdir -p /etc/systemd/system/NetworkManager.service.d +unpriv curl 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 +sudo systemctl daemon-reload +sudo systemctl restart NetworkManager + +sudo mkdir -p /etc/systemd/system/irqbalance.service.d +unpriv curl 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 +sudo systemctl daemon-reload +sudo systemctl restart irqbalance + +# Remove packages + +sudo dnf remove baobab chrome-gnome-shell evince firefox gedit gnome-calculator gnome-characters gnome-font-viewer gnome-screenshot gnome-tour qemu-guest-agent 'sssd*' 'yelp*' + +# Setup dnf +unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/dnf/dnf.conf | sudo tee /etc/dnf/dnf.conf +sudo sed -i 's/^metalink=.*/&\&protocol=https/g' /etc/yum.repos.d/* + +# 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-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 +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 + +mkdir -p /etc/systemd/system/unbound.service.d +echo $'[Service] +MemoryDenyWriteExecute=true +PrivateDevices=true +PrivateTmp=true +ProtectHome=true +ProtectClock=true +ProtectControlGroups=true +ProtectKernelLogs=true +ProtectKernelModules=true +# This breaks using socket options like \'so-rcvbuf\'. Explicitly disable for visibility. +ProtectKernelTunables=true +ProtectProc=invisible +RestrictAddressFamilies=AF_INET AF_INET6 AF_NETLINK AF_UNIX +RestrictRealtime=true +SystemCallArchitectures=native +SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module mount @obsolete @resources +RestrictNamespaces=yes +LockPersonality=yes' | sudo tee /etc/systemd/system/unbound.service.d/override.conf + +sudo systemctl enable --now unbound + +# Setup yara +sudo dnf install -y yara +sudo insights-client --collector malware-detection +sudo sed -i 's/test_scan: true/test_scan: false/' /etc/insights-client/malware-detection-config.yml + +# Setup automatic updates + +sudo sed -i 's/apply_updates = no/apply_updates = yes\nreboot = when-needed/g' /etc/dnf/automatic.conf +sudo systemctl enable --now dnf-automatic.timer + +# Enable fstrim.timer +sudo systemctl enable --now fstrim.timer + +### Differentiating bare metal and virtual installs + +# Installing tuned first here because virt-what is 1 of its dependencies anyways +sudo dnf install tuned -y + +virt_type=$(virt-what) +if [ "$virt_type" = '' ]; then + output 'Virtualization: Bare Metal.' +elif [ "$virt_type" = 'openvz lxc' ]; then + output 'Virtualization: OpenVZ 7.' +elif [ "$virt_type" = 'xen xen-hvm' ]; then + output 'Virtualization: Xen-HVM.' +elif [ "$virt_type" = 'xen xen-hvm aws' ]; then + output 'Virtualization: Xen-HVM on AWS.' +else + output "Virtualization: $virt_type." +fi + +# Setup tuned +if [ "$virt_type" = '' ]; then + sudo tuned-adm profile latency-performance + if [ "$virt_type" = 'kvm' ]; then + sudo dnf install qemu-guest-agent -y + fi +else + sudo tuned-adm profile virtual-guest +fi + +# Setup real-ucode and hardened_malloc +if [ "$virt_type" = '' ] || [ "${MACHINE_TYPE}" == 'x86_64' ]; then + sudo dnf install 'https://divested.dev/rpm/fedora/divested-release-20231210-2.noarch.rpm' -y + sudo sed -i 's/^metalink=.*/&?protocol=https/g' /etc/yum.repos.d/divested-release.repo + if [ "${MACHINE_TYPE}" != 'x86_64' ]; then + sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,real-ucode,microcode_ctl,amd-ucode-firmware + sudo dnf install real-ucode -y + sudo dracut -f + elif [ "$virt_type" != '' ]; then + sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,hardened_malloc + sudo dnf install hardened_malloc -y + else + sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,real-ucode,microcode_ctl,amd-ucode-firmware,hardened_malloc + sudo dnf install real-ucode hardened_malloc -y + echo 'libhardened_malloc.so' | sudo tee /etc/ld.so.preload + sudo dracut -f + fi +elif [ "${MACHINE_TYPE}" == 'aarch64' ]; then + sudo dnf copr enable secureblue/hardened_malloc -y + sudo dnf install hardened_malloc -y +fi + +# Setup fwupd +if [ "$virt_type" = '' ]; then + sudo dnf install fwupd -y + 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 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 + sudo systemctl daemon-reload + sudo systemctl enable --now fwupd-refresh.timer +fi \ No newline at end of file