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nixos/profiles/hardened: replace 'with' using inherit and add disable option
This commit is contained in:
Nico Felbinger
parent
81f97de458
commit
958d1fb821
1 changed files with 97 additions and 85 deletions
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@ -12,114 +12,126 @@
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pkgs,
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...
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}:
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with lib;
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let
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inherit (lib)
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mkDefault
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mkOverride
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mkEnableOption
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mkIf
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maintainers
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;
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in
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{
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meta = {
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maintainers = [
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maintainers.joachifm
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maintainers.emily
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];
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options.profiles.hardened = mkEnableOption "hardened" // {
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default = true;
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example = false;
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};
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config = mkIf config.profiles.hardened {
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meta = {
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maintainers = [
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maintainers.joachifm
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maintainers.emily
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];
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};
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boot.kernelPackages = mkDefault pkgs.linuxPackages_hardened;
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boot.kernelPackages = mkDefault pkgs.linuxPackages_hardened;
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nix.settings.allowed-users = mkDefault [ "@users" ];
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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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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.lockKernelModules = mkDefault true;
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security.protectKernelImage = mkDefault true;
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security.protectKernelImage = mkDefault true;
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security.allowSimultaneousMultithreading = mkDefault false;
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security.allowSimultaneousMultithreading = mkDefault false;
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security.forcePageTableIsolation = mkDefault true;
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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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# 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.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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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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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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# 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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# 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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# 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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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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# 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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# 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 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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# 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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# 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 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 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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# 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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}
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