Consistency fixes

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

Fedora-Workstation-39.sh

@@ -54,6 +54,9 @@ sudo firewall-cmd --permanent --add-service=dhcpv6-client
 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/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
@@ -72,6 +75,9 @@ 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=isolation_force 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 extra_latent_entropy debugfs=off'
 
+# 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

GCP-Debian-11.sh

@@ -74,20 +74,22 @@ unpriv curl https://raw.githubusercontent.com/Kicksecure/security-misc/master/us
 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 mkdir -p /etc/systemd/system/NetworkManager.service.d
-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 sysctl -p
 
 # Rebuild initramfs
 sudo update-initramfs -u
 
+# 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
+
+# System Hardening
+sudo mkdir -p /etc/systemd/system/NetworkManager.service.d
+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
+
 # Update GRUB config
 echo 'GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX 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=isolation_force 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 extra_latent_entropy debugfs=off"' | sudo tee -a /etc/grub.d/40_custom
 sudo update-grub
 
-# Security limit
-echo '* hard core 0' | tee -a /etc/security/limits.conf
-
 # Setup tuned
 sudo dnf install tuned -y
 sudo tuned-adm profile virtual-guest

Kali-Linux.sh

@@ -48,6 +48,13 @@ sudo sysctl -p
 # Rebuild initramfs
 sudo update-initramfs -u
 
+# 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
+
+# System Hardening
+sudo mkdir -p /etc/systemd/system/NetworkManager.service.d
+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
+
 # Update GRUB config
 echo 'GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX 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=isolation_force 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 extra_latent_entropy debugfs=off"' | sudo tee -a /etc/grub.d/40_custom
 sudo update-grub

Proxmox-8.sh

@@ -82,10 +82,15 @@ sed -i 's/net.ipv4.icmp_echo_ignore_all=1/net.ipv4.icmp_echo_ignore_all=0/g' /et
 sed -i 's/net.ipv6.icmp.echo_ignore_all=1/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
-mkdir -p /etc/systemd/system/NetworkManager.service.d
-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
-echo "* hard core 0" | tee -a /etc/security/limits.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
+
+# Harden SSH
 sed -i 's/#GSSAPIAuthentication no/GSSAPIAuthentication no/g' /etc/ssh/sshd_config
 
 # Setup automatic updates

RHEL-Server-9.sh

@@ -41,6 +41,9 @@ 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
@@ -65,7 +68,10 @@ 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=isolation_force 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 extra_latent_entropy debugfs=off'
 
-# Systemd hardening
+# 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

Ubuntu-22.04-Server.sh

@@ -83,6 +83,9 @@ sudo sysctl -p
 # Rebuild initramfs
 sudo update-initramfs -u
 
+# 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
+
 # Update GRUB config
 if [ ! -d /boot/efi/EFI/ZBM ]; then
   echo 'GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX 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=isolation_force 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 extra_latent_entropy debugfs=off"' | sudo tee -a /etc/grub.d/40_custom

Ubuntu-23.10-Desktop.sh

@@ -84,6 +84,9 @@ sudo sysctl -p
 # Rebuild initramfs
 sudo update-initramfs -u
 
+# 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
+
 # Update GRUB config
 echo 'GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX 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=isolation_force 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 extra_latent_entropy debugfs=off"' | sudo tee -a /etc/grub.d/40_custom
 sudo update-grub

etc/security/limits.d/30-disable-coredump.conf

@@ -0,0 +1 @@
+* hard core 0

etc/ssh/sshd_config.d/10-custom.conf

@@ -8,3 +8,4 @@ PasswordAuthentication no
 PermitRootLogin no
 KerberosAuthentication no
 GSSAPIAuthentication no
+Banner /etc/issue.net