#!/bin/bash # Copyright (C) 2023 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. #Assuming that you are using ANSSI-BP-028 # Setup NTS sudo curl https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/chrony.conf -o /etc/chrony.conf echo '# Command-line options for chronyd OPTIONS="-F 1"' | sudo tee /etc/sysconfig/chronyd sudo systemctl restart chronyd # Setup Firewalld sudo firewall-cmd --permanent --remove-service=cockpit sudo firewall-cmd --reload # Harden SSH mkdir -p /etc/ssh/ssh_config.d /etc/ssh/sshd_config.d echo 'GSSAPIAuthentication no VerifyHostKeyDNS yes' | sudo tee /etc/ssh/ssh_config.d/10-custom.conf sudo chmod 644 /etc/ssh/ssh_config.d/10-custom.conf echo 'HostKey /etc/ssh/ssh_host_ed25519_key HostKeyAlgorithms ssh-ed25519 #KexAlgorithms sntrup761x25519-sha512@openssh.com PubkeyAcceptedKeyTypes ssh-ed25519 Ciphers aes256-gcm@openssh.com MACs -* PasswordAuthentication no PermitRootLogin no KerberosAuthentication no GSSAPIAuthentication no' | sudo tee /etc/ssh/sshd_config.d/10-custom.conf sudo chmod 644 /etc/ssh/sshd_config.d/10-custom.conf sudo curl https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/systemd/system/sshd.service.d/local.conf -o /etc/systemd/system/sshd.service.d/override.conf sudo systemctl daemon-reload sudo systemctl restart sshd # Kernel hardening sudo curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/modprobe.d/30_security-misc.conf -o /etc/modprobe.d/30_security-misc.conf sudo curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/sysctl.d/30_security-misc.conf -o /etc/sysctl.d/30_security-misc.conf sudo sed -i 's/kernel.yama.ptrace_scope=2/kernel.yama.ptrace_scope=3/g' /etc/sysctl.d/30_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/30_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/30_security-misc.conf sudo curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/sysctl.d/30_silent-kernel-printk.conf -o /etc/sysctl.d/30_silent-kernel-printk.conf sudo curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/sysctl.d/30_security-misc_kexec-disable.conf -o /etc/sysctl.d/30_security-misc_kexec-disable.conf sudo grubby --update-kernel=ALL --args='spectre_v2=on spec_store_bypass_disable=on l1tf=full,force mds=full,nosmt tsx=off tsx_async_abort=full,nosmt kvm.nx_huge_pages=force nosmt=force l1d_flush=on mmio_stale_data=full,nosmt random.trust_bootloader=off random.trust_cpu=off intel_iommu=on amd_iommu=on efi=disable_early_pci_dma iommu.passthrough=0 iommu.strict=1 slab_nomerge init_on_alloc=1 init_on_free=1 pti=on vsyscall=none page_alloc.shuffle=1 randomize_kstack_offset=on extra_latent_entropy debugfs=off' sudo dracut -f sudo sysctl -p # Systemd hardening sudo mkdir -p /etc/systemd/system/NetworkManager.service.d sudo curl https://gitlab.com/divested/brace/-/raw/master/brace/usr/lib/systemd/system/NetworkManager.service.d/99-brace.conf -o /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 sudo curl https://gitlab.com/divested/brace/-/raw/master/brace/usr/lib/systemd/system/irqbalance.service.d/99-brace.conf -o /etc/systemd/system/irqbalance.service.d/99-brace.conf sudo systemctl daemon-reload sudo systemctl restart irqbalance # Setup dnf echo -e 'fastestmirror=1\nmax_parallel_downloads=10\ndeltarpm=False\ndefaultyes=True\ninstall_weak_deps=False\ncountme=False' | sudo tee -a /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 #Setup fwupd sudo dnf install fwupd -y mkdir -p /etc/systemd/system/fwupd-refresh.service.d echo '[Service] ExecStart=/usr/bin/fwupdmgr update' | tee /etc/systemd/system/fwupd-refresh.service.d/override.conf sudo systemctl daemon-reload sudo systemctl enable --now fwupd-refresh.timer # Setup tuned sudo dnf install tuned -y sudo tuned-adm profile virtual-guest # Enable fstrim.timer sudo systemctl enable --now fstrim.timer