# Add additional boot parameters for hardening (requires reboot) set-kargs-hardening: #!/usr/bin/bash read -p "Do you need support for 32-bit processes/syscalls? (This is mostly used by legacy software, with some exceptions, such as Steam) [y/N]: " YES if [[ "$YES" == [Yy]* ]]; then echo "Keeping 32-bit support." else IAEMU_NO="--append-if-missing=ia32_emulation=0" echo "Disabling 32-bit support, for the next boot." fi read -p "Do you want to force disable Simultaneous Multithreading (SMT) / Hyperthreading? (This can cause a reduction in the performance of certain tasks in favor of security) (Note that in most hardware SMT will be disabled anyways to mitigate a known vulnerability, this turns it off on all hardware regardless) [y/N]: " YES if [[ "$YES" == [Yy]* ]]; then NOSMT_YES="--append-if-missing=nosmt=force" echo "Force disabling SMT/Hyperthreading." else echo "Not force disabling SMT/Hyperthreading." fi read -p "Would you like to set additional (unstable) hardening kargs? (Warning: Setting these kargs may lead to boot issues on some hardware.) [y/N]: " YES if [[ "$YES" == [Yy]* ]]; then UNSTABLE_YES="--append-if-missing=efi=disable_early_pci_dma \ --append-if-missing=debugfs=off" echo "Setting unstable hardening kargs." else echo "Not setting unstable hardening kargs." fi echo "Applying boot parameters..." rpm-ostree kargs \ ${UNSTABLE_YES:+$UNSTABLE_YES} ${IAEMU_NO:+$IAEMU_NO} ${NOSMT_YES:+$NOSMT_YES} \ --append-if-missing=init_on_alloc=1 \ --append-if-missing=init_on_free=1 \ --append-if-missing=slab_nomerge \ --append-if-missing=page_alloc.shuffle=1 \ --append-if-missing=randomize_kstack_offset=on \ --append-if-missing=vsyscall=none \ --append-if-missing=lockdown=confidentiality \ --append-if-missing=random.trust_cpu=off \ --append-if-missing=random.trust_bootloader=off \ --append-if-missing=iommu=force \ --append-if-missing=intel_iommu=on \ --append-if-missing=amd_iommu=force_isolation \ --append-if-missing=iommu.passthrough=0 \ --append-if-missing=iommu.strict=1 \ --append-if-missing=pti=on \ --append-if-missing=module.sig_enforce=1 \ --append-if-missing=mitigations=auto,nosmt \ --append-if-missing=spectre_v2=on \ --append-if-missing=spec_store_bypass_disable=on \ --append-if-missing=l1d_flush=on \ --append-if-missing=gather_data_sampling=force echo "Hardening kargs applied." # Remove all hardening boot parameters (requires reboot) remove-kargs-hardening: #!/usr/bin/bash rpm-ostree kargs \ --delete-if-present="init_on_alloc=1" \ --delete-if-present="init_on_free=1" \ --delete-if-present="slab_nomerge" \ --delete-if-present="page_alloc.shuffle=1" \ --delete-if-present="randomize_kstack_offset=on" \ --delete-if-present="vsyscall=none" \ --delete-if-present="lockdown=confidentiality" \ --delete-if-present="random.trust_cpu=off" \ --delete-if-present="random.trust_bootloader=off" \ --delete-if-present="iommu=force" \ --delete-if-present="intel_iommu=on" \ --delete-if-present="amd_iommu=force_isolation" \ --delete-if-present="iommu.passthrough=0" \ --delete-if-present="iommu.strict=1" \ --delete-if-present="pti=on" \ --delete-if-present="module.sig_enforce=1" \ --delete-if-present="mitigations=auto,nosmt" \ --delete-if-present="efi=disable_early_pci_dma" \ --delete-if-present="debugfs=off" \ --delete-if-present="spectre_v2=on" \ --delete-if-present="spec_store_bypass_disable=on" \ --delete-if-present="l1d_flush=on" \ --delete-if-present="gather_data_sampling=force" \ --delete-if-present="ia32_emulation=0" echo "Hardening kargs removed." # Harden flatpaks by preloading hardened_malloc (highest supported hwcap) harden-flatpak: #!/usr/bin/bash flatpak override --user --filesystem=host-os:ro uarches="$(/usr/lib64/ld-linux-x86-64.so.2 --help | grep '(supported, searched)' | cut -d'v' -f2)" bestuarch="${uarches:0:1}" if [ -z "$bestuarch" ] ; then echo "No microarchitecture support detected. Using default x86-64-v1 architecture." flatpak override --user --env=LD_PRELOAD=/var/run/host/usr/lib64/libhardened_malloc.so else echo "x86-64-v$bestuarch support detected. Using x86-64-v$bestuarch microarchitecture." flatpak override --user --env=LD_PRELOAD=/var/run/host/usr/lib64/glibc-hwcaps/x86-64-v"$bestuarch"/libhardened_malloc.so fi # Toggle the cups service on/off toggle-cups: #!/usr/bin/pkexec /usr/bin/bash if systemctl is-enabled --quiet cups; then firewall-cmd --permanent --remove-port=631/tcp firewall-cmd --permanent --remove-port=631/udp firewall-cmd --reload systemctl mask cups systemctl disable cups systemctl stop cups systemctl daemon-reload echo "Cups disabled." else firewall-cmd --permanent --add-port=631/tcp firewall-cmd --permanent --add-port=631/udp firewall-cmd --reload systemctl unmask cups systemctl enable cups systemctl start cups systemctl daemon-reload echo "Cups enabled." fi # Toggle bluetooth kernel modules on/off (requires reboot) toggle-bluetooth-modules: #!/usr/bin/pkexec /usr/bin/bash BLUE_MOD_FILE="/etc/modprobe.d/99-bluetooth.conf" if test -e $BLUE_MOD_FILE; then sudo rm -f $BLUE_MOD_FILE echo "Bluetooth kernel modules disabled. Reboot to take effect." else sudo sh -c 'echo "install bluetooth /sbin/modprobe --ignore-install bluetooth" >> "$1"' _ "$BLUE_MOD_FILE" sudo sh -c 'echo "install btusb /sbin/modprobe --ignore-install btusb" >> "$1"' _ "$BLUE_MOD_FILE" sudo chmod 644 $BLUE_MOD_FILE echo "Bluetooth kernel modules enabled. Reboot to take effect." fi # Toggle GHNS (KDE Get New Stuff) toggle-ghns: #!/usr/bin/pkexec /usr/bin/bash KDE_GLOBALS_FILE="/etc/xdg/kdeglobals" if test -e $KDE_GLOBALS_FILE; then if grep -q "ghns=false" "$KDE_GLOBALS_FILE"; then sed -i "s/ghns=false/ghns=true/" "$KDE_GLOBALS_FILE" echo "GHNS enabled." elif grep -q "ghns=true" "$KDE_GLOBALS_FILE"; then sed -i "s/ghns=true/ghns=false/" "$KDE_GLOBALS_FILE" echo "GHNS disabled." else echo "The kdeglobals file is missing the ghns toggle." fi else echo "No kdeglobals file found. Are you on kinoite?" fi # enable a kernel module that is disabled by modprobe.d (requires restart) override-enable-module mod_name: #!/usr/bin/pkexec /usr/bin/bash MOD_NAME="{{ mod_name }}" MOD_FILE="/etc/modprobe.d/99-$MOD_NAME.conf" if test -e $MOD_FILE; then echo "$MOD_NAME module is already enabled." else sudo sh -c 'echo "install $1 /sbin/modprobe --ignore-install $1" >> "$2"' _ "$MOD_NAME" "$MOD_FILE" sudo chmod 644 $MOD_FILE echo "Override created to enable $MOD_NAME module. Reboot to take effect." fi # reset the override by `just override-enable-module`, i.e. disable the module again (requires restart) override-reset-module mod_name: #!/usr/bin/pkexec /usr/bin/bash MOD_NAME="{{ mod_name }}" MOD_FILE="/etc/modprobe.d/99-$MOD_NAME.conf" if test -e $MOD_FILE; then sudo rm -f $MOD_FILE echo "The override for $MOD_NAME module has been reset. Reboot to take effect." else echo "No override found for $MOD_NAME module." fi # Setup USBGuard setup-usbguard: #!/usr/bin/bash echo "Notice: This will generate a policy based on your existing connected USB devices." ACTIVE_USERNAME=$(whoami) pkexec sh -c ' mkdir -p /var/log/usbguard mkdir -p /etc/usbguard chmod 755 /etc/usbguard usbguard generate-policy > /etc/usbguard/rules.conf systemctl enable --now usbguard.service usbguard add-user $1 ' -- $ACTIVE_USERNAME systemctl enable --user --now usbguard-notifier.service # Rerun Yafti rerun-yafti: yafti -f /usr/share/ublue-os/firstboot/yafti.yml # Toggle anticheat support by changing ptrace scope (requires restart) toggle-anticheat-support: #!/usr/bin/pkexec /usr/bin/bash SYSCTL_HARDENING_FILE="/etc/sysctl.d/hardening.conf" if grep -q "kernel.yama.ptrace_scope = 3" "$SYSCTL_HARDENING_FILE"; then sed -i "s/kernel.yama.ptrace_scope = 3/kernel.yama.ptrace_scope = 1/" "$SYSCTL_HARDENING_FILE" echo "Anticheat support enabled. ptrace_scope set to 1." elif grep -q "kernel.yama.ptrace_scope = 1" "$SYSCTL_HARDENING_FILE"; then sed -i "s/kernel.yama.ptrace_scope = 1/kernel.yama.ptrace_scope = 3/" "$SYSCTL_HARDENING_FILE" echo "Anticheat support disabled. ptrace_scope set back to 3." else echo "The sysctl hardening file is missing the ptrace_scope setting." fi # Toggle Gnome JIT JavaScript for GJS and WebkitGTK (requires session restart) toggle-gnome-jit-js: #!/usr/bin/pkexec /usr/bin/bash ENV_FILE="/etc/profile.d/gnome-disable-jit.sh" if test -e $ENV_FILE; then sudo rm -f $ENV_FILE echo "JIT JavaScript for Gnome and WebkitGTK has been enabled." else sudo cp /usr$ENV_FILE $ENV_FILE sudo chmod 644 $ENV_FILE echo "JIT JavaScript for Gnome and WebkitGTK has been disabled." fi # Toggle support for using GNOME user extensions toggle-gnome-extensions: #!/usr/bin/bash GSETTING="$(gsettings get org.gnome.shell allow-extension-installation)" if [[ "${GSETTING}" == "false" ]]; then gsettings set org.gnome.shell allow-extension-installation true echo "Support for GNOME user extensions have been enabled" else gsettings reset org.gnome.shell allow-extension-installation echo "Support for GNOME user extensions have been disabled" fi # Toggle Xwayland support toggle-xwayland ACTION="prompt": #!/usr/bin/pkexec /usr/bin/bash source /usr/lib/ujust/ujust.sh OPTION={{ ACTION }} if [ "$OPTION" == "prompt" ]; then echo "${bold}Toggling Xwayland (requires logout)${normal}" echo 'For which DE/WM do you want to toggle Xwayland?' OPTION=$(ugum choose "GNOME" "KDE Plasma" "Sway") elif [ "$OPTION" == "help" ]; then echo "Usage: ujust toggle-xwayland