172dc1336f
This module implements a significant refactoring in grsecurity
configuration for NixOS, making it far more usable by default and much
easier to configure.
- New security.grsecurity NixOS attributes.
- All grsec kernels supported
- Allows default 'auto' grsec configuration, or custom config
- Supports custom kernel options through kernelExtraConfig
- Defaults to high-security - user must choose kernel, server/desktop
mode, and any virtualisation software. That's all.
- kptr_restrict is fixed under grsecurity (it's unwriteable)
- grsecurity patch creation is now significantly abstracted
- only need revision, version, and SHA1
- kernel version requirements are asserted for sanity
- built kernels can have the uname specify the exact grsec version
for development or bug reports. Off by default (requires
`security.grsecurity.config.verboseVersion = true;`)
- grsecurity sysctl support
- By default, disabled.
- For people who enable it, NixOS deploys a 'grsec-lock' systemd
service which runs at startup. You are expected to configure sysctl
through NixOS like you regularly would, which will occur before the
service is started. As a result, changing sysctl settings requires
a reboot.
- New default group: 'grsecurity'
- Root is a member by default
- GRKERNSEC_PROC_GID is implicitly set to the 'grsecurity' GID,
making it possible to easily add users to this group for /proc
access
- AppArmor is now automatically enabled where it wasn't before, despite
implying features.apparmor = true
The most trivial example of enabling grsecurity in your kernel is by
specifying:
security.grsecurity.enable = true;
security.grsecurity.testing = true; # testing 3.13 kernel
security.grsecurity.config.system = "desktop"; # or "server"
This specifies absolutely no virtualisation support. In general, you
probably at least want KVM host support, which is a little more work.
So:
security.grsecurity.enable = true;
security.grsecurity.stable = true; # enable stable 3.2 kernel
security.grsecurity.config = {
system = "server";
priority = "security";
virtualisationConfig = "host";
virtualisationSoftware = "kvm";
hardwareVirtualisation = true;
}
This module has primarily been tested on Hetzner EX40 & VQ7 servers
using NixOps.
Signed-off-by: Austin Seipp <aseipp@pobox.com>
113 lines
2.9 KiB
Nix
113 lines
2.9 KiB
Nix
{ stdenv, fetchurl, fetchgit, apparmor }:
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let
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makeTuxonicePatch = { version, kernelVersion, sha256,
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url ? "http://tuxonice.nigelcunningham.com.au/downloads/all/tuxonice-for-linux-${kernelVersion}-${version}.patch.bz2" }:
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{ name = "tuxonice-${kernelVersion}";
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patch = stdenv.mkDerivation {
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name = "tuxonice-${version}-for-${kernelVersion}.patch";
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src = fetchurl {
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inherit url sha256;
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};
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phases = [ "installPhase" ];
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installPhase = ''
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source $stdenv/setup
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bunzip2 -c $src > $out
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'';
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};
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};
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grsecPatch = { grversion ? "3.0", kversion, revision, branch, sha256 }:
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{ name = "grsecurity-${grversion}-${kversion}";
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inherit grversion kversion revision;
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patch = fetchurl {
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url = "http://grsecurity.net/${branch}/grsecurity-${grversion}-${kversion}-${revision}.patch";
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inherit sha256;
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};
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features.grsecurity = true;
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# The grsec kernel patchset includes AppArmor patches
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features.apparmor = true;
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};
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makeAppArmorPatch = {apparmor, version}:
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stdenv.mkDerivation {
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name = "apparmor-${version}.patch";
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phases = ["installPhase"];
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installPhase = ''
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cat ${apparmor}/kernel-patches/${version}/* > $out
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'';
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};
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in
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rec {
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apparmor_3_2 = rec {
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version = "3.2";
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name = "apparmor-${version}";
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patch = makeAppArmorPatch { inherit apparmor version; };
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features.apparmor = true;
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};
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apparmor_3_4 = rec {
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version = "3.4";
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name = "apparmor-${version}";
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patch = makeAppArmorPatch { inherit apparmor version; };
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features.apparmor = true;
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};
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no_xsave =
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{ name = "no-xsave";
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patch = ./no-xsave.patch;
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features.noXsave = true;
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};
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mips_fpureg_emu =
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{ name = "mips-fpureg-emulation";
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patch = ./mips-fpureg-emulation.patch;
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};
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mips_fpu_sigill =
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{ name = "mips-fpu-sigill";
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patch = ./mips-fpu-sigill.patch;
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};
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mips_ext3_n32 =
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{ name = "mips-ext3-n32";
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patch = ./mips-ext3-n32.patch;
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};
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tuxonice_3_10 = makeTuxonicePatch {
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version = "2013-11-07";
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kernelVersion = "3.10.18";
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sha256 = "00b1rqgd4yr206dxp4mcymr56ymbjcjfa4m82pxw73khj032qw3j";
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};
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grsecurity_stable = grsecPatch
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{ kversion = "3.2.57";
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revision = "201404111812";
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branch = "stable";
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sha256 = "1kp2f5g5jdl6r833fm5l2sgf7qsjddl2br7mislc37iqgwzjmhlx";
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};
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grsecurity_vserver = grsecPatch
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{ kversion = "3.2.57";
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revision = "vs2.3.2.16-201404111814";
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branch = "vserver";
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sha256 = "025kxk4j8kx7v5gmpafls67747l39ssfmzh0drg0hyg2yc0hjk2c";
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};
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grsecurity_unstable = grsecPatch
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{ kversion = "3.13.9";
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revision = "201404111815";
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branch = "test";
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sha256 = "1ikqvi0hv32m5rgxa8dpqr5v84hx7bnjfr6c1bvsfqikc818isvy";
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};
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grsec_fix_path =
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{ name = "grsec-fix-path";
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patch = ./grsec-path.patch;
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};
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}
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