Use SecureBlue and custom configs whenever possible

Signed-off-by: Tommy <contact@tommytran.io>

Fedora-Server-40.sh

@@ -63,20 +63,10 @@ sudo systemctl daemon-reload
 sudo systemctl restart sshd
 
 # Security kernel settings
-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
+unpriv curl https://raw.githubusercontent.com/secureblue/secureblue/live/config/files/usr/etc/modprobe.d/blacklist.conf | sudo tee /etc/modprobe.d/server-blacklist.conf
-sudo chmod 644 /etc/modprobe.d/30_security-misc.conf
+sudo chmod 644 /etc/modprobe.d/server-blacklist.conf
-sudo sed -i 's/#[[:space:]]*install msr/install msr/g' /etc/modprobe.d/30_security-misc.conf
+unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysctl.d/99-server.conf | sudo tee /etc/sysctl.d/99-server.conf
-sudo sed -i 's/#[[:space:]]*install bluetooth/install bluetooth/g' /etc/modprobe.d/30_security-misc.conf
+sudo chmod 644 /etc/sysctl.d/99-server.conf
-sudo sed -i 's/#[[:space:]]*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/990-security-misc.conf
-sudo chmod 644 /etc/sysctl.d/990-security-misc.conf
-sudo sed -i 's/kernel\.yama\.ptrace_scope[[:space:]]*=.*/kernel.yama.ptrace_scope=3/g' /etc/sysctl.d/990-security-misc.conf
-sudo sed -i 's/net\.ipv4\.icmp_echo_ignore_all[[:space:]]*=.*/net.ipv4.icmp_echo_ignore_all=0/g' /etc/sysctl.d/990-security-misc.conf
-sudo sed -i 's/net\.ipv6\.icmp.echo_ignore_all[[:space:]]*=.*/net.ipv6.icmp.echo_ignore_all=0/g' /etc/sysctl.d/990-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
-sudo chmod 644 /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 chmod 644 /etc/sysctl.d/30_security-misc_kexec-disable.conf
 sudo dracut -f
 sudo sysctl -p
 
@@ -88,7 +78,11 @@ else
 fi
 
 # Disable coredump
+umask 022
 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
+mkdir -p /etc/systemd/coredump.conf.d
+unpriv curl 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
+umask 077
 
 # Setup ZRAM
 unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/systemd/zram-generator.conf | sudo tee /etc/systemd/zram-generator.conf
@@ -105,6 +99,10 @@ 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
+
 # Install appropriate virtualization drivers
 if [ "$virtualization" = 'kvm' ]; then
     sudo dnf install -y qemu-guest-agent
@@ -150,22 +148,9 @@ MACHINE_TYPE=$(uname -m)
 if [ "$virtualization" = 'none' ] || [ "${MACHINE_TYPE}" == 'x86_64' ]; then
     sudo dnf install -y 'https://divested.dev/rpm/fedora/divested-release-20231210-2.noarch.rpm'
     sudo sed -i 's/^metalink=.*/&?protocol=https/g' /etc/yum.repos.d/divested-release.repo
-    if [ "${MACHINE_TYPE}" != 'x86_64' ]; then
+    sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,real-ucode,microcode_ctl,amd-ucode-firmware
-        sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,real-ucode,microcode_ctl,amd-ucode-firmware
+    sudo dnf install -y real-ucode
-        sudo dnf install -y real-ucode
+    sudo dracut -f
-        sudo dracut -f
-    elif [ "$virtualization" != 'none' ]; then
-        sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,hardened_malloc
-        sudo dnf install -y hardened_malloc
-    else
-        sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,real-ucode,microcode_ctl,amd-ucode-firmware,hardened_malloc
-        sudo dnf install -y real-ucode hardened_malloc
-        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 -y hardened_malloc
 fi
 
 # Setup networking

Fedora-Workstation-40.sh

@@ -62,16 +62,14 @@ unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/m
 sudo chmod 644 /etc/ssh/ssh_config.d/10-custom.conf
 
 # Security kernel settings
-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
+if [ "${virtualization}" = 'parallels' ]; then
-sudo chmod 644 /etc/modprobe.d/30_security-misc.conf
+    unpriv curl https://raw.githubusercontent.com/TommyTran732/Kernel-Module-Blacklist/main/etc/modprobe.d/workstation-blacklist.conf | sudo tee /etc/modprobe.d/workstation-blacklist.conf
-sudo sed -i 's/#[[:space:]]*install msr/install msr/g' /etc/modprobe.d/30_security-misc.conf
+else
-unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/990-security-misc.conf | sudo tee /etc/sysctl.d/990-security-misc.conf
+    unpriv curl https://raw.githubusercontent.com/secureblue/secureblue/live/config/files/usr/etc/modprobe.d/blacklist.conf | sudo tee /etc/modprobe.d/workstation-blacklist.conf
-sudo chmod 644 /etc/sysctl.d/990-security-misc.conf
+fi
-sudo sed -i 's/kernel\.yama\.ptrace_scope[[:space:]]*=.*/kernel.yama.ptrace_scope=3/g' /etc/sysctl.d/990-security-misc.conf
+sudo chmod 644 /etc/modprobe.d/workstation-blacklist.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/TommyTran732/Linux-Setup-Scripts/main/etc/sysctl.d/99-workstation.conf | sudo tee /etc/sysctl.d/99-workstation.conf
-sudo chmod 644 /etc/sysctl.d/30_silent-kernel-printk.conf
+sudo chmod 644 /etc/sysctl.d/99-workstation.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 chmod 644 /etc/sysctl.d/30_security-misc_kexec-disable.conf
 sudo dracut -f
 sudo sysctl -p
 
@@ -91,7 +89,11 @@ else
 fi
 
 # Disable coredump
+umask 022
 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
+mkdir -p /etc/systemd/coredump.conf.d
+unpriv curl 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
+umask 077
 
 # Disable XWayland
 umask 022
@@ -162,6 +164,10 @@ sudo dnf config-manager --set-disabled fedora-cisco-openh264
 # Update packages
 sudo dnf -y upgrade
 
+# Install hardened_malloc
+sudo dnf copr enable secureblue/hardened_malloc -y
+sudo dnf install -y hardened_malloc
+
 # Install packages that I use
 sudo dnf -y install adw-gtk3-theme gnome-console gnome-shell-extension-appindicator gnome-shell-extension-blur-my-shell gnome-shell-extension-background-logo
 
@@ -218,26 +224,13 @@ else
     sudo tuned-adm profile virtual-guest
 fi
 
-# Setup real-ucode and hardened_malloc
+# Setup real-ucode
 if [ "$virtualization" = 'none' ] || [ "${MACHINE_TYPE}" == 'x86_64' ]; then
     sudo dnf install -y 'https://divested.dev/rpm/fedora/divested-release-20231210-2.noarch.rpm'
     sudo sed -i 's/^metalink=.*/&?protocol=https/g' /etc/yum.repos.d/divested-release.repo
-    if [ "${MACHINE_TYPE}" != 'x86_64' ]; then
+    sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,real-ucode,microcode_ctl,amd-ucode-firmware
-        sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,real-ucode,microcode_ctl,amd-ucode-firmware
+    sudo dnf install -y real-ucode
-        sudo dnf install -y real-ucode
+    sudo dracut -f
-        sudo dracut -f
-    elif [ "$virtualization" != 'none' ]; then
-        sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,hardened_malloc
-        sudo dnf install -y hardened_malloc
-    else
-        sudo dnf config-manager --save --setopt=divested.includepkgs=divested-release,real-ucode,microcode_ctl,amd-ucode-firmware,hardened_malloc
-        sudo dnf install -y real-ucode hardened_malloc
-        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 -y hardened_malloc
 fi
 
 # Setup networking

Proxmox-8.sh

@@ -73,23 +73,23 @@ proxmox-boot-tool refresh
 ###
 
 # Kernel hardening
-curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/etc/modprobe.d/30_security-misc.conf -o /etc/modprobe.d/30_security-misc.conf
+curl https://raw.githubusercontent.com/secureblue/secureblue/live/config/files/usr/etc/modprobe.d/blacklist.conf | tee /etc/modprobe.d/server-blacklist.conf
-sudo sed -i 's/#[[:space:]]*install msr/install msr/g' /etc/modprobe.d/30_security-misc.conf
+chmod 644 /etc/modprobe.d/server-blacklist.conf
-sed -i 's/#[[:space:]]*install bluetooth/install bluetooth/g' /etc/modprobe.d/30_security-misc.conf
+sed -i 's/kernel_io_uring_disable = 2/#ernel_io_uring_disable = 2/g'
-sed -i 's/#[[:space:]]*install btusb/install btusb/g' /etc/modprobe.d/30_security-misc.conf
+curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysctl.d/99-server.conf | tee /etc/sysctl.d/99-server.conf
-curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/990-security-misc.conf -o /etc/sysctl.d/990-security-misc.conf
+chmod 644 /etc/sysctl.d/99-server.conf
-sed -i 's/kernel\.yama\.ptrace_scope[[:space:]]*=.*/kernel.yama.ptrace_scope=3/g' /etc/sysctl.d/990-security-misc.conf
+dracut -f
-sed -i 's/net\.ipv4\.icmp_echo_ignore_all[[:space:]]*=.*/net.ipv4.icmp_echo_ignore_all=0/g' /etc/sysctl.d/990-security-misc.conf
-sed -i 's/net\.ipv6\.icmp.echo_ignore_all[[:space:]]*=.*/net.ipv6.icmp.echo_ignore_all=0/g' /etc/sysctl.d/990-security-misc.conf
-curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/30_silent-kernel-printk.conf -o /etc/sysctl.d/30_silent-kernel-printk.conf
-curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/30_security-misc_kexec-disable.conf -o /etc/sysctl.d/30_security-misc_kexec-disable.conf
 sysctl -p
 
 # Rebuild initramfs
 update-initramfs -u
 
 # Disable coredump
-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
+umask 022
+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
+mkdir -p /etc/systemd/coredump.conf.d
+unpriv curl 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
+umask 077
 
 # Harden SSH
 sed -i 's/#GSSAPIAuthentication no/GSSAPIAuthentication no/g' /etc/ssh/sshd_config

RHEL-9.sh

@@ -57,27 +57,21 @@ sudo systemctl daemon-reload
 sudo systemctl restart sshd
 
 # Security kernel settings
-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
+unpriv curl https://raw.githubusercontent.com/secureblue/secureblue/live/config/files/usr/etc/modprobe.d/blacklist.conf | sudo tee /etc/modprobe.d/server-blacklist.conf
-sudo chmod 644 /etc/modprobe.d/30_security-misc.conf
+sudo chmod 644 /etc/modprobe.d/server-blacklist.conf
-sudo sed -i 's/#[[:space:]]*install msr/install msr/g' /etc/modprobe.d/30_security-misc.conf
+unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysctl.d/99-server.conf | sudo tee /etc/sysctl.d/99-server.conf
-sudo sed -i 's/#[[:space:]]*install bluetooth/install bluetooth/g' /etc/modprobe.d/30_security-misc.conf
+sudo chmod 644 /etc/sysctl.d/99-server.conf
-sudo sed -i 's/#[[:space:]]*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/990-security-misc.conf
-sudo chmod 644 /etc/sysctl.d/990-security-misc.conf
-sudo sed -i 's/kernel\.yama\.ptrace_scope[[:space:]]*=.*/kernel.yama.ptrace_scope=3/g' /etc/sysctl.d/990-security-misc.conf
-sudo sed -i 's/net\.ipv4\.icmp_echo_ignore_all[[:space:]]*=.*/net.ipv4.icmp_echo_ignore_all=0/g' /etc/sysctl.d/990-security-misc.conf
-sudo sed -i 's/net\.ipv6\.icmp.echo_ignore_all[[:space:]]*=.*/net.ipv6.icmp.echo_ignore_all=0/g' /etc/sysctl.d/990-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
-sudo chmod 644 /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 chmod 644 /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 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
+umask 022
 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
+mkdir -p /etc/systemd/coredump.conf.d
+unpriv curl 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
+umask 077
 
 # Setup DNF
 unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/dnf/dnf.conf | sudo tee /etc/dnf/dnf.conf

Ubuntu-23.10-Desktop.sh

@@ -52,24 +52,27 @@ fi
 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
 
-# Kernel hardening
+# Security kernel settings
-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
+if [ "${virtualization}" = 'parallels' ]; then
-sudo chmod 644 /etc/modprobe.d/30_security-misc.conf
+    unpriv curl https://raw.githubusercontent.com/TommyTran732/Kernel-Module-Blacklist/main/etc/modprobe.d/workstation-blacklist.conf | sudo tee /etc/modprobe.d/workstation-blacklist.conf
-sudo sed -i 's/#[[:space:]]*install msr/install msr/g' /etc/modprobe.d/30_security-misc.conf
+else
-unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/990-security-misc.conf | sudo tee /etc/sysctl.d/990-security-misc.conf
+    unpriv curl https://raw.githubusercontent.com/secureblue/secureblue/live/config/files/usr/etc/modprobe.d/blacklist.conf | sudo tee /etc/modprobe.d/workstation-blacklist.conf
-sudo chmod 644 /etc/sysctl.d/990-security-misc.conf
+fi
-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
+sudo chmod 644 /etc/modprobe.d/workstation-blacklist.conf
-sudo chmod 644 /etc/sysctl.d/30_silent-kernel-printk.conf
+unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysctl.d/99-workstation.conf | sudo tee /etc/sysctl.d/99-workstation.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 chmod 644 /etc/sysctl.d/99-workstation.conf
-sudo chmod 644 /etc/sysctl.d/30_security-misc_kexec-disable.conf
+sudo dracut -f
-sudo sed -i 's/kernel\.yama\.ptrace_scope[[:space:]]*=.*/kernel.yama.ptrace_scope=3/g' /etc/sysctl.d/990-security-misc.conf
 sudo sysctl -p
 
 # Rebuild initramfs
 sudo update-initramfs -u
 
 # Disable coredump
+umask 022
 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
+mkdir -p /etc/systemd/coredump.conf.d
+unpriv curl 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
+umask 077
 
 # Update GRUB config
 sed -i 's/splash/splash 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/g' /etc/default/grub

Ubuntu-24.04-Server.sh

@@ -57,24 +57,23 @@ unpriv curl https://raw.githubusercontent.com/GrapheneOS/infrastructure/main/sys
 sudo systemctl daemon-reload
 sudo systemctl restart ssh
 
-# Kernel hardening
+# Security kernel settings
-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
+unpriv curl https://raw.githubusercontent.com/secureblue/secureblue/live/config/files/usr/etc/modprobe.d/blacklist.conf | sudo tee /etc/modprobe.d/server-blacklist.conf
-sudo sed -i 's/#[[:space:]]*install msr/install msr/g' /etc/modprobe.d/30_security-misc.conf
+sudo chmod 644 /etc/modprobe.d/server-blacklist.conf
-sudo sed -i 's/#[[:space:]]*install bluetooth/install bluetooth/g' /etc/modprobe.d/30_security-misc.conf
+unpriv curl https://raw.githubusercontent.com/TommyTran732/Linux-Setup-Scripts/main/etc/sysctl.d/99-server.conf | sudo tee /etc/sysctl.d/99-server.conf
-sudo sed -i 's/#[[:space:]]*install btusb/install btusb/g' /etc/modprobe.d/30_security-misc.conf
+sudo chmod 644 /etc/sysctl.d/99-server.conf
-unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/usr/lib/sysctl.d/990-security-misc.conf | sudo tee /etc/sysctl.d/990-security-misc.conf
+sudo dracut -f
-sudo sed -i 's/kernel.yama.ptrace_scope[[:space:]]*=.*/kernel.yama.ptrace_scope=3/g' /etc/sysctl.d/990-security-misc.conf
-sudo sed -i 's/net\.ipv4\.icmp_echo_ignore_all[[:space:]]*=.*/net.ipv4.icmp_echo_ignore_all=0/g' /etc/sysctl.d/990-security-misc.conf
-sudo sed -i 's/net\.ipv6\.icmp.echo_ignore_all[[:space:]]*=.*/net.ipv6.icmp.echo_ignore_all=0/g' /etc/sysctl.d/990-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 sysctl -p
 
 # Rebuild initramfs
 sudo update-initramfs -u
 
 # Disable coredump
+umask 022
 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
+mkdir -p /etc/systemd/coredump.conf.d
+unpriv curl 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
+umask 077
 
 # Update GRUB config
 if [ ! -d /boot/efi/EFI/ZBM ]; then

etc/sysctl.d/99-server.conf

@@ -0,0 +1,114 @@
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl
+dev.tty.ldisc_autoload = 0
+
+# https://access.redhat.com/solutions/1985633
+# Seems dangerous
+fs.binfmt_misc.status = 0
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl-userspace
+# Enable fs.protected sysctls
+fs.protected_regular = 2
+fs.protected_fifos = 2
+fs.protected_symlinks = 1
+fs.protected_hardlinks = 1
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#core-dumps
+# Disable coredumps
+# For additional safety, disable coredumps using ulimit and systemd too.
+kernel.core_pattern=|/bin/false
+fs.suid_dumpable = 0
+
+# Restrict dmesg to CAP_SYS_LOG
+# https://www.kernel.org/doc/Documentation/sysctl/kernel.txt
+kernel.dmesg_restrict = 1
+
+# https://www.kernel.org/doc/Documentation/sysctl/kernel.txt
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl-kernel
+# https://kernsec.org/wiki/index.php/Bug_Classes/Kernel_pointer_leak
+# Restrict access to /proc
+kernel.kptr_restrict = 2
+
+# Not needed, I don't do livepatching and reboot regularly.
+# On Ubuntu LTS just sed this to be 0 if you use livepatch.
+kernel.kexec_load_disabled = 1
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl
+# Basically, restrict eBPF to CAP_BPF.
+kernel.unprivileged_bpf_disabled = 1
+net.core.bpf_jit_harden = 2
+
+# Docker running as root do not require unpriv user ns, which is dangerous, so we disabe it
+kernel.unprivileged_userns_clone = 0
+
+# Needed for gVisor, which is used on almost all of my servers
+kernel.yama.ptrace_scope = 1
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl
+# Restrict performance events from unprivileged users as much as possible.
+# We are using 4 here, since Ubuntu supports such a level.
+# Official Linux kernel documentation only says >= so it probably will work.
+kernel.perf_event_paranoid = 4
+
+# https://github.com/containerd/containerd/issues/9048
+# Disable io_uring, a very sus feature.
+# Note that this will make using Proxmox extremely annoying though, so you might wanna comment this out
+# on a Proxmox node.
+kernel_io_uring_disable = 2
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl-kernel
+# Disable sysrq
+kernel.sysrq = 0
+
+# https://www.stigviewer.com/stig/red_hat_enterprise_linux_6/2020-09-03/finding/V-217911
+# Not running a router here, so no redirects
+net.ipv4.conf.*.send_redirects = 0
+net.ipv4.conf.*.accept_redirects = 0
+net.ipv6.conf.*.accept_redirects = 0
+
+# Check if the source of the IP address is reachable through the same interface it came in
+# Basic IP spoofing mitigation
+net.ipv4.conf.*.rp_filter = 1
+
+# Respond to ICMP
+net.ipv4.icmp_echo_ignore_all = 1
+net.ipv6.icmp.echo_ignore_all = 1
+
+# Enable IP Forwarding
+# Almost all of my servers run Docker anyways, and Docker absolutely requires this.
+net.ipv4.ip_forward = 1
+net.ipv6.conf.all.forwarding = 1
+
+# https://www.stigviewer.com/stig/red_hat_enterprise_linux_6/2016-06-05/finding/V-38537
+# Ignore bogus icmp response
+net.ipv4.icmp_ignore_bogus_error_responses = 1
+
+# Protection against time-wait assasination attacks
+net.ipv4.tcp_rfc1337 = 1
+
+# Enable SYN cookies
+# Basic SYN flood mitigation
+net.ipv4.tcp_syncookies = 1 
+
+# https://access.redhat.com/sites/default/files/attachments/20150325_network_performance_tuning.pdf
+# Make sure TCP timestamp is enabled
+net.ipv4.tcp_timestamps = 1
+
+# https://access.redhat.com/sites/default/files/attachments/20150325_network_performance_tuning.pdf
+# Disable TCP SACK
+# We have good networking :)
+net.ipv4.tcp_sack = 0
+
+# No SACK, therefore no Duplicated SACK
+net.ipv4.tcp_dsack = 0
+
+# Improve ALSR effectiveness for mmap
+vm.mmap_rnd_bits = 32
+vm.mmap_rnd_compat_bits = 16
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl-kernel
+# Restrict userfaultfd to CAP_SYS_PTRACE
+# https://bugs.archlinux.org/task/62780
+# Interestingly enough, Arch does not even have userfaultfd in their kernel, so it is
+# probably not used in the real world at all.
+vm.unprivileged_userfaultfd = 0

etc/sysctl.d/99-workstation.conf

@@ -0,0 +1,114 @@
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl
+dev.tty.ldisc_autoload = 0
+
+# https://access.redhat.com/solutions/1985633
+# Seems dangerous
+fs.binfmt_misc.status = 0
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl-userspace
+# Enable fs.protected sysctls
+fs.protected_regular = 2
+fs.protected_fifos = 2
+fs.protected_symlinks = 1
+fs.protected_hardlinks = 1
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#core-dumps
+# Disable coredumps
+# For additional safety, disable coredumps using ulimit and systemd too.
+kernel.core_pattern=|/bin/false
+fs.suid_dumpable = 0
+
+# Restrict dmesg to CAP_SYS_LOG
+# https://www.kernel.org/doc/Documentation/sysctl/kernel.txt
+kernel.dmesg_restrict = 1
+
+# https://www.kernel.org/doc/Documentation/sysctl/kernel.txt
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl-kernel
+# https://kernsec.org/wiki/index.php/Bug_Classes/Kernel_pointer_leak
+# Restrict access to /proc
+kernel.kptr_restrict = 2
+
+# Not needed, I don't do livepatching and reboot regularly.
+# On a workstation, this shouldn't be used at all. Don't live patch, just reboot.
+kernel.kexec_load_disabled = 1
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl
+# Basically, restrict eBPF to CAP_BPF.
+kernel.unprivileged_bpf_disabled = 1
+net.core.bpf_jit_harden = 2
+
+# Needed for Flatpak and Bubblewrap
+kernel.unprivileged_userns_clone = 1
+
+# Disable ptrace. Not needed on workstations.
+kernel.yama.ptrace_scope = 3
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl
+# Restrict performance events from unprivileged users as much as possible.
+# We are using 4 here, since Ubuntu supports such a level.
+# Official Linux kernel documentation only says >= so it probably will work.
+kernel.perf_event_paranoid = 4
+
+# https://github.com/containerd/containerd/issues/9048
+# Disable io_uring, a very sus feature.
+# Note that this will make using Proxmox extremely annoying though, so you might wanna comment this out
+# on a Proxmox node.
+kernel_io_uring_disable = 2
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl-kernel
+# Disable sysrq
+kernel.sysrq = 0
+
+# https://www.stigviewer.com/stig/red_hat_enterprise_linux_6/2020-09-03/finding/V-217911
+# Not running a router here, so no redirects
+net.ipv4.conf.*.send_redirects = 0
+net.ipv4.conf.*.accept_redirects = 0
+net.ipv6.conf.*.accept_redirects = 0
+
+# Check if the source of the IP address is reachable through the same interface it came in
+# Basic IP spoofing mitigation
+net.ipv4.conf.*.rp_filter = 1
+
+# Do not respond to ICMP
+net.ipv4.icmp_echo_ignore_all = 1
+net.ipv6.icmp.echo_ignore_all = 1
+
+# Enable IP Forwarding
+# Needed for VM networking and whatnot.
+net.ipv4.ip_forward = 1
+net.ipv6.conf.all.forwarding = 1
+
+# https://www.stigviewer.com/stig/red_hat_enterprise_linux_6/2016-06-05/finding/V-38537
+# Ignore bogus icmp response
+net.ipv4.icmp_ignore_bogus_error_responses = 1
+
+# Protection against time-wait assasination attacks
+net.ipv4.tcp_rfc1337 = 1
+
+# Enable SYN cookies
+# Basic SYN flood mitigation
+net.ipv4.tcp_syncookies = 1 
+
+# https://access.redhat.com/sites/default/files/attachments/20150325_network_performance_tuning.pdf
+# Make sure TCP timestamp is enabled
+net.ipv4.tcp_timestamps = 1
+
+# https://access.redhat.com/sites/default/files/attachments/20150325_network_performance_tuning.pdf
+# Disable TCP SACK
+# We have good networking :)
+net.ipv4.tcp_sack = 0
+
+# No SACK, therefore no Duplicated SACK
+net.ipv4.tcp_dsack = 0
+
+# Improve ALSR effectiveness for mmap
+vm.mmap_rnd_bits = 32
+vm.mmap_rnd_compat_bits = 16
+
+# https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl-kernel
+# Restrict userfaultfd to CAP_SYS_PTRACE
+# https://bugs.archlinux.org/task/62780
+# Interestingly enough, Arch does not even have userfaultfd in their kernel, so it is
+# probably not used in the real world at all.
+vm.unprivileged_userfaultfd = 0

etc/systemd/coredump.conf.d/disable.conf

@@ -0,0 +1,2 @@
+[Coredump]
+Storage=none