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https://github.com/tommytran732/Linux-Setup-Scripts
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Add RHEL 9
Signed-off-by: Tommy <contact@tommytran.io>
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224
RHEL-9.sh
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224
RHEL-9.sh
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#!/bin/bash
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# Copyright (C) 2021-2024 Thien Tran
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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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output(){
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echo -e '\e[36m'"$1"'\e[0m';
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}
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unpriv(){
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sudo -u nobody "$@"
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}
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# Compliance
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sudo systemctl mask debug-shell.service
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sudo systemctl mask kdump.service
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# Setup NTS
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unpriv curl https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/chrony.conf | sudo tee /etc/chrony.conf
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unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysconfig/chronyd | sudo tee /etc/sysconfig/chronyd
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sudo systemctl restart chronyd
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# Make home directory private
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sudo chmod 700 /home/*
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# Setup Firewalld
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sudo firewall-cmd --permanent --remove-service=cockpit
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sudo firewall-cmd --reload
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sudo firewall-cmd --lockdown-on
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# Remove nullok
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sudo /usr/bin/sed -i 's/\s+nullok//g' /etc/pam.d/system-auth
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# Harden SSH
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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
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sudo chmod 644 /etc/ssh/sshd_config.d/10-custom.conf
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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
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sudo chmod 644 /etc/ssh/ssh_config.d/10-custom.conf
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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
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sudo systemctl daemon-reload
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sudo systemctl restart sshd
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# Kernel hardening
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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
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sudo sed -i 's/#install msr/install msr/g' /etc/modprobe.d/30_security-misc.conf
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sudo sed -i 's/# install bluetooth/install bluetooth/g' /etc/modprobe.d/30_security-misc.conf
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sudo sed -i 's/# install btusb/install btusb/g' /etc/modprobe.d/30_security-misc.conf
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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
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sudo sed -i 's/kernel.yama.ptrace_scope=2/kernel.yama.ptrace_scope=3/g' /etc/sysctl.d/10-security-misc.conf
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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
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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
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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
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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
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sudo dracut -f
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sudo sysctl -p
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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'
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# Disable coredump
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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
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# Systemd Hardening
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sudo mkdir -p /etc/systemd/system/NetworkManager.service.d
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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
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sudo systemctl daemon-reload
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sudo systemctl restart NetworkManager
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sudo mkdir -p /etc/systemd/system/irqbalance.service.d
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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
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sudo systemctl daemon-reload
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sudo systemctl restart irqbalance
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# Remove packages
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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*'
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# Setup dnf
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unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/dnf/dnf.conf | sudo tee /etc/dnf/dnf.conf
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sudo sed -i 's/^metalink=.*/&\&protocol=https/g' /etc/yum.repos.d/*
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# Setup unbound
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sudo dnf install unbound -y
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echo 'server:
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chroot: ""
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auto-trust-anchor-file: "/var/lib/unbound/root.key"
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trust-anchor-signaling: yes
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root-key-sentinel: yes
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tls-ciphers: "PROFILE=SYSTEM"
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hide-http-user-agent: yes
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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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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
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mkdir -p /etc/systemd/system/unbound.service.d
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echo $'[Service]
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MemoryDenyWriteExecute=true
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PrivateDevices=true
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PrivateTmp=true
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ProtectHome=true
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ProtectClock=true
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ProtectControlGroups=true
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ProtectKernelLogs=true
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ProtectKernelModules=true
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# This breaks using socket options like \'so-rcvbuf\'. Explicitly disable for visibility.
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ProtectKernelTunables=true
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ProtectProc=invisible
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RestrictAddressFamilies=AF_INET AF_INET6 AF_NETLINK AF_UNIX
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RestrictRealtime=true
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SystemCallArchitectures=native
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SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module mount @obsolete @resources
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RestrictNamespaces=yes
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LockPersonality=yes' | sudo tee /etc/systemd/system/unbound.service.d/override.conf
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sudo systemctl enable --now unbound
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# Setup yara
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sudo dnf install -y yara
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sudo insights-client --collector malware-detection
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sudo sed -i 's/test_scan: true/test_scan: false/' /etc/insights-client/malware-detection-config.yml
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# Setup automatic updates
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sudo sed -i 's/apply_updates = no/apply_updates = yes\nreboot = when-needed/g' /etc/dnf/automatic.conf
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sudo systemctl enable --now dnf-automatic.timer
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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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# Installing tuned first here because virt-what is 1 of its dependencies anyways
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sudo dnf install tuned -y
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virt_type=$(virt-what)
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if [ "$virt_type" = '' ]; then
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output 'Virtualization: Bare Metal.'
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elif [ "$virt_type" = 'openvz lxc' ]; then
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output 'Virtualization: OpenVZ 7.'
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elif [ "$virt_type" = 'xen xen-hvm' ]; then
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output 'Virtualization: Xen-HVM.'
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elif [ "$virt_type" = 'xen xen-hvm aws' ]; then
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output 'Virtualization: Xen-HVM on AWS.'
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else
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output "Virtualization: $virt_type."
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fi
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# Setup tuned
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if [ "$virt_type" = '' ]; then
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sudo tuned-adm profile latency-performance
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if [ "$virt_type" = 'kvm' ]; then
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sudo dnf install qemu-guest-agent -y
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fi
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else
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sudo tuned-adm profile virtual-guest
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fi
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# Setup real-ucode and hardened_malloc
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if [ "$virt_type" = '' ] || [ "${MACHINE_TYPE}" == 'x86_64' ]; then
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sudo dnf install 'https://divested.dev/rpm/fedora/divested-release-20231210-2.noarch.rpm' -y
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sudo sed -i 's/^metalink=.*/&?protocol=https/g' /etc/yum.repos.d/divested-release.repo
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if [ "${MACHINE_TYPE}" != 'x86_64' ]; then
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sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,real-ucode,microcode_ctl,amd-ucode-firmware
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sudo dnf install real-ucode -y
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sudo dracut -f
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elif [ "$virt_type" != '' ]; then
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sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,hardened_malloc
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sudo dnf install hardened_malloc -y
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else
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sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,real-ucode,microcode_ctl,amd-ucode-firmware,hardened_malloc
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sudo dnf install real-ucode hardened_malloc -y
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echo 'libhardened_malloc.so' | sudo tee /etc/ld.so.preload
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sudo dracut -f
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fi
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elif [ "${MACHINE_TYPE}" == 'aarch64' ]; then
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sudo dnf copr enable secureblue/hardened_malloc -y
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sudo dnf install hardened_malloc -y
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fi
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# Setup fwupd
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if [ "$virt_type" = '' ]; then
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sudo dnf install fwupd -y
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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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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
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sudo systemctl daemon-reload
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sudo systemctl enable --now fwupd-refresh.timer
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fi
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