enable hardened profile
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3 changed files with 49 additions and 140 deletions
13
flake.nix
13
flake.nix
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@ -126,13 +126,12 @@
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# apparmor-dev.nixosModules.default
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./specific/grimm-nixos-ssd/configuration.nix
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#(
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# { modulesPath, lib, ... }:
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# {
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# imports = lib.singleton "${modulesPath}/profiles/hardened.nix";
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# }
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#)
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./hardened.nix
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(
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{ modulesPath, lib, ... }:
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{
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imports = lib.singleton "${modulesPath}/profiles/hardened.nix";
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}
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)
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home-manager.nixosModules.home-manager
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./hm
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119
hardened.nix
119
hardened.nix
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@ -1,119 +0,0 @@
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# A profile with most (vanilla) hardening options enabled by default,
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# potentially at the cost of stability, features and performance.
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#
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# This profile enables options that are known to affect system
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# stability. If you experience any stability issues when using the
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# profile, try disabling it. If you report an issue and use this
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# profile, always mention that you do.
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{
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config,
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lib,
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pkgs,
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...
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}:
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with lib;
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{
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# boot.kernelPackages = mkDefault pkgs.linuxPackages_hardened;
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#nix.settings.allowed-users = mkDefault [ "@users" ];
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#environment.memoryAllocator.provider = mkDefault "scudo";
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#environment.variables.SCUDO_OPTIONS = mkDefault "ZeroContents=1";
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#security.lockKernelModules = mkDefault true;
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#security.protectKernelImage = mkDefault true;
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#security.allowSimultaneousMultithreading = mkDefault false;
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#security.forcePageTableIsolation = mkDefault true;
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# This is required by podman to run containers in rootless mode.
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#security.unprivilegedUsernsClone = mkDefault config.virtualisation.containers.enable;
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#security.virtualisation.flushL1DataCache = mkDefault "always";
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#security.apparmor.enable = mkDefault true;
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#security.apparmor.killUnconfinedConfinables = mkDefault true;
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boot.kernelParams = [
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# Don't merge slabs
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"slab_nomerge"
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# Overwrite free'd pages
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"page_poison=1"
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# Enable page allocator randomization
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"page_alloc.shuffle=1"
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# Disable debugfs
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"debugfs=off"
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];
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boot.blacklistedKernelModules = [
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# Obscure network protocols
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"ax25"
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"netrom"
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"rose"
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# Old or rare or insufficiently audited filesystems
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"adfs"
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"affs"
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"bfs"
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"befs"
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"cramfs"
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"efs"
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"erofs"
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"exofs"
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"freevxfs"
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"f2fs"
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"hfs"
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"hpfs"
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"jfs"
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"minix"
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"nilfs2"
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"ntfs"
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"omfs"
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"qnx4"
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"qnx6"
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"sysv"
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"ufs"
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];
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# Hide kptrs even for processes with CAP_SYSLOG
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boot.kernel.sysctl."kernel.kptr_restrict" = mkOverride 500 2;
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# Disable bpf() JIT (to eliminate spray attacks)
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boot.kernel.sysctl."net.core.bpf_jit_enable" = mkDefault false;
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# Disable ftrace debugging
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boot.kernel.sysctl."kernel.ftrace_enabled" = mkDefault false;
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# Enable strict reverse path filtering (that is, do not attempt to route
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# packets that "obviously" do not belong to the iface's network; dropped
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# packets are logged as martians).
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boot.kernel.sysctl."net.ipv4.conf.all.log_martians" = mkDefault true;
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boot.kernel.sysctl."net.ipv4.conf.all.rp_filter" = mkDefault "1";
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boot.kernel.sysctl."net.ipv4.conf.default.log_martians" = mkDefault true;
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boot.kernel.sysctl."net.ipv4.conf.default.rp_filter" = mkDefault "1";
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# Ignore broadcast ICMP (mitigate SMURF)
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boot.kernel.sysctl."net.ipv4.icmp_echo_ignore_broadcasts" = mkDefault true;
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# Ignore incoming ICMP redirects (note: default is needed to ensure that the
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# setting is applied to interfaces added after the sysctls are set)
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boot.kernel.sysctl."net.ipv4.conf.all.accept_redirects" = mkDefault false;
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boot.kernel.sysctl."net.ipv4.conf.all.secure_redirects" = mkDefault false;
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boot.kernel.sysctl."net.ipv4.conf.default.accept_redirects" = mkDefault false;
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boot.kernel.sysctl."net.ipv4.conf.default.secure_redirects" = mkDefault false;
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boot.kernel.sysctl."net.ipv6.conf.all.accept_redirects" = mkDefault false;
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boot.kernel.sysctl."net.ipv6.conf.default.accept_redirects" = mkDefault false;
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# Ignore outgoing ICMP redirects (this is ipv4 only)
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boot.kernel.sysctl."net.ipv4.conf.all.send_redirects" = mkDefault false;
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boot.kernel.sysctl."net.ipv4.conf.default.send_redirects" = mkDefault false;
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}
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@ -36,24 +36,43 @@ in
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"usb_storage"
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"nvme"
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];
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boot.kernelModules = [
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"tmpfs"
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"iwlwifi"
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"iwlmvm"
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"mac80211"
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"bluetooth"
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"cfg80211"
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]; # "kvm-intel"
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boot.extraModprobeConfig = "options iwlwifi disable_11ax=Y";
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security.lockKernelModules = false; # PAIN on an intended-portable setup
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# security.protectKernelImage = false;
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boot.specialFileSystems."/dev/shm".options = [ "noexec" ]; # TODO: does this work?
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boot.zfs = {
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forceImportRoot = false;
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requestEncryptionCredentials = false; # none of the zfs datasets that should be mounted are encrypted. User homes happen later.
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};
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boot.kernelModules = [ "kvm-intel" ];
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boot.supportedFilesystems.zfs = true;
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networking.hostId = "40fa5ea8";
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# boot.kernelPackages = config.boot.zfs.package.latestCompatibleLinuxPackages;
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boot.kernelPackages = pkgs.linuxPackages_6_6;
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boot.extraModulePackages = [ ];
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# boot.kernelParams = [ "mds=full,nosmt" ];
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services.homed.enable = true;
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fileSystems."/" = {
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device = "none";
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fsType = "tmpfs";
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options = [ "defaults" "size=2G" "mode=755" "noexec" ];
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options = [
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"defaults"
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"size=2G"
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"mode=755"
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"noexec"
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];
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};
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fileSystems."${persist}" = {
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@ -63,20 +82,28 @@ in
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};
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environment.etc."machine-id".source = "${persist}/etc/machine-id";
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environment.memoryAllocator.provider = "libc";
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fileSystems."/nix/var" = {
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device = "${persist}/nix/var";
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options = [ "bind" ];
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options = [
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"bind"
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"noexec"
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];
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};
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fileSystems."/etc/NetworkManager/system-connections" = {
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device = "${persist}/etc/NetworkManager/system-connections";
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options = [ "bind" ];
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options = [
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"bind"
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"noexec"
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];
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};
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fileSystems."/nix" = {
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device = "zpool/nix";
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fsType = "zfs";
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options = [ "exec" ];
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};
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fileSystems."/var" = {
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@ -85,9 +112,16 @@ in
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options = [ "noexec" ];
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};
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fileSystems."${nix_build}" = { # can execute
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device = "zpool/nix-build";
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fsType = "zfs";
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fileSystems."${nix_build}" = {
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# can execute
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device = "none";
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fsType = "tmpfs";
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options = [
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"defaults"
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"size=30%"
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"mode=755"
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"exec"
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];
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};
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systemd.services.nix-daemon.environment.TMPDIR = nix_build;
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@ -101,11 +135,6 @@ in
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];
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};
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# fileSystems."/home" =
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# { device = "zpool/home";
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# fsType = "zfs";
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# };
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fileSystems."/boot" = {
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device = "/dev/disk/by-uuid/12CE-A600";
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fsType = "vfat";
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