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|
{ grsecOptions, lib, pkgs }:
with lib;
let
cfg = {
kernelPatch = grsecOptions.kernelPatch;
config = {
mode = "auto";
sysctl = false;
denyChrootChmod = false;
denyUSB = false;
restrictProc = false;
restrictProcWithGroup = true;
unrestrictProcGid = 121; # Ugh, an awful hack. See grsecurity NixOS gid
disableRBAC = false;
verboseVersion = false;
kernelExtraConfig = "";
} // grsecOptions.config;
};
vals = rec {
mkKernel = patch:
{
inherit patch;
inherit (patch) kernel patches grversion revision;
};
grKernel = mkKernel cfg.kernelPatch;
## -- grsecurity configuration ---------------------------------------------
grsecPrioCfg =
if cfg.config.priority == "security" then
"GRKERNSEC_CONFIG_PRIORITY_SECURITY y"
else
"GRKERNSEC_CONFIG_PRIORITY_PERF y";
grsecSystemCfg =
if cfg.config.system == "desktop" then
"GRKERNSEC_CONFIG_DESKTOP y"
else
"GRKERNSEC_CONFIG_SERVER y";
grsecVirtCfg =
if cfg.config.virtualisationConfig == null then
"GRKERNSEC_CONFIG_VIRT_NONE y"
else if cfg.config.virtualisationConfig == "host" then
"GRKERNSEC_CONFIG_VIRT_HOST y"
else
"GRKERNSEC_CONFIG_VIRT_GUEST y";
grsecHwvirtCfg = if cfg.config.virtualisationConfig == null then "" else
if cfg.config.hardwareVirtualisation == true then
"GRKERNSEC_CONFIG_VIRT_EPT y"
else
"GRKERNSEC_CONFIG_VIRT_SOFT y";
grsecVirtswCfg =
let virtCfg = opt: "GRKERNSEC_CONFIG_VIRT_"+opt+" y";
in
if cfg.config.virtualisationConfig == null then ""
else if cfg.config.virtualisationSoftware == "xen" then virtCfg "XEN"
else if cfg.config.virtualisationSoftware == "kvm" then virtCfg "KVM"
else if cfg.config.virtualisationSoftware == "vmware" then virtCfg "VMWARE"
else virtCfg "VIRTUALBOX";
grsecMainConfig = if cfg.config.mode == "custom" then "" else ''
GRKERNSEC_CONFIG_AUTO y
${grsecPrioCfg}
${grsecSystemCfg}
${grsecVirtCfg}
${grsecHwvirtCfg}
${grsecVirtswCfg}
'';
grsecConfig =
let boolToKernOpt = b: if b then "y" else "n";
# Disable RANDSTRUCT under virtualbox, as it has some kind of
# breakage with the vbox guest drivers
#randstruct = optionalString config.virtualisation.virtualbox.guest.enable
# "GRKERNSEC_RANDSTRUCT n";
# Disable restricting links under the testing kernel, as something
# has changed causing it to fail miserably during boot.
#restrictLinks = optionalString cfg.testing
# "GRKERNSEC_LINK n";
in ''
GRKERNSEC y
${grsecMainConfig}
# The paxmarks mechanism relies on ELF header markings, but the default
# grsecurity configuration only enables xattr markings
PAX_PT_PAX_FLAGS y
${if cfg.config.restrictProc then
"GRKERNSEC_PROC_USER y"
else
optionalString cfg.config.restrictProcWithGroup ''
GRKERNSEC_PROC_USERGROUP y
GRKERNSEC_PROC_GID ${toString cfg.config.unrestrictProcGid}
''
}
GRKERNSEC_SYSCTL ${boolToKernOpt cfg.config.sysctl}
GRKERNSEC_CHROOT_CHMOD ${boolToKernOpt cfg.config.denyChrootChmod}
GRKERNSEC_DENYUSB ${boolToKernOpt cfg.config.denyUSB}
GRKERNSEC_NO_RBAC ${boolToKernOpt cfg.config.disableRBAC}
${cfg.config.kernelExtraConfig}
'';
## -- grsecurity kernel packages -------------------------------------------
localver = grkern:
"-grsec" + optionalString cfg.config.verboseVersion
"-${grkern.grversion}-${grkern.revision}";
grsecurityOverrider = args: grkern: {
# additional build inputs for gcc plugins, required by some PaX/grsec features
nativeBuildInputs = args.nativeBuildInputs ++ (with pkgs; [ gmp libmpc mpfr ]);
preConfigure = (args.preConfigure or "") + ''
echo ${localver grkern} > localversion-grsec
'';
};
mkGrsecKern = grkern:
lowPrio (overrideDerivation (grkern.kernel.override (args: {
kernelPatches = args.kernelPatches ++ [ grkern.patch ] ++ grkern.patches;
argsOverride = {
modDirVersion = "${grkern.kernel.modDirVersion}${localver grkern}";
};
extraConfig = grsecConfig;
features.grsecurity = true;
ignoreConfigErrors = true; # Too lazy to model the config options that work with grsecurity and don't for now
})) (args: grsecurityOverrider args grkern));
mkGrsecPkg = grkern: pkgs.linuxPackagesFor grkern (mkGrsecPkg grkern);
## -- Kernel packages ------------------------------------------------------
grsecKernel = mkGrsecKern grKernel;
grsecPackage = mkGrsecPkg grsecKernel;
};
in vals
|