152 lines
5.2 KiB
Nix
152 lines
5.2 KiB
Nix
{ grsecOptions, lib, pkgs }:
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with lib;
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let
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cfg = {
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stable = grsecOptions.stable or false;
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testing = grsecOptions.testing or false;
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config = {
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mode = "auto";
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sysctl = false;
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denyChrootChmod = false;
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restrictProc = false;
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restrictProcWithGroup = true;
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unrestrictProcGid = 121; # Ugh, an awful hack. See grsecurity NixOS gid
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disableRBAC = false;
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verboseVersion = false;
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kernelExtraConfig = "";
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} // grsecOptions.config;
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};
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vals = rec {
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mkKernel = kernel: patch:
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assert patch.kversion == kernel.version;
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{ inherit kernel patch;
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inherit (patch) grversion revision;
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};
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test-patch = with pkgs.kernelPatches; grsecurity_unstable;
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stable-patch = with pkgs.kernelPatches; grsecurity_stable;
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grKernel = if cfg.stable
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then mkKernel pkgs.linux_3_14 stable-patch
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else mkKernel pkgs.linux_3_17 test-patch;
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## -- grsecurity configuration ---------------------------------------------
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grsecPrioCfg =
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if cfg.config.priority == "security" then
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"GRKERNSEC_CONFIG_PRIORITY_SECURITY y"
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else
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"GRKERNSEC_CONFIG_PRIORITY_PERF y";
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grsecSystemCfg =
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if cfg.config.system == "desktop" then
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"GRKERNSEC_CONFIG_DESKTOP y"
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else
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"GRKERNSEC_CONFIG_SERVER y";
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grsecVirtCfg =
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if cfg.config.virtualisationConfig == "none" then
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"GRKERNSEC_CONFIG_VIRT_NONE y"
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else if cfg.config.virtualisationConfig == "host" then
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"GRKERNSEC_CONFIG_VIRT_HOST y"
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else
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"GRKERNSEC_CONFIG_VIRT_GUEST y";
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grsecHwvirtCfg = if cfg.config.virtualisationConfig == "none" then "" else
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if cfg.config.hardwareVirtualisation == true then
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"GRKERNSEC_CONFIG_VIRT_EPT y"
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else
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"GRKERNSEC_CONFIG_VIRT_SOFT y";
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grsecVirtswCfg =
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let virtCfg = opt: "GRKERNSEC_CONFIG_VIRT_"+opt+" y";
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in
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if cfg.config.virtualisationConfig == "none" then ""
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else if cfg.config.virtualisationSoftware == "xen" then virtCfg "XEN"
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else if cfg.config.virtualisationSoftware == "kvm" then virtCfg "KVM"
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else if cfg.config.virtualisationSoftware == "vmware" then virtCfg "VMWARE"
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else virtCfg "VIRTUALBOX";
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grsecMainConfig = if cfg.config.mode == "custom" then "" else ''
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GRKERNSEC_CONFIG_AUTO y
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${grsecPrioCfg}
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${grsecSystemCfg}
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${grsecVirtCfg}
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${grsecHwvirtCfg}
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${grsecVirtswCfg}
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'';
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grsecConfig =
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let boolToKernOpt = b: if b then "y" else "n";
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# Disable RANDSTRUCT under virtualbox, as it has some kind of
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# breakage with the vbox guest drivers
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#randstruct = optionalString config.services.virtualbox.enable
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# "GRKERNSEC_RANDSTRUCT n";
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# Disable restricting links under the testing kernel, as something
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# has changed causing it to fail miserably during boot.
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restrictLinks = optionalString cfg.testing
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"GRKERNSEC_LINK n";
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in ''
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GRKERNSEC y
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${grsecMainConfig}
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${if cfg.config.restrictProc then
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"GRKERNSEC_PROC_USER y"
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else
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optionalString cfg.config.restrictProcWithGroup ''
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GRKERNSEC_PROC_USERGROUP y
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GRKERNSEC_PROC_GID ${toString cfg.config.unrestrictProcGid}
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''
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}
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GRKERNSEC_SYSCTL ${boolToKernOpt cfg.config.sysctl}
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GRKERNSEC_CHROOT_CHMOD ${boolToKernOpt cfg.config.denyChrootChmod}
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GRKERNSEC_NO_RBAC ${boolToKernOpt cfg.config.disableRBAC}
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${restrictLinks}
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${cfg.config.kernelExtraConfig}
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'';
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## -- grsecurity kernel packages -------------------------------------------
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localver = grkern:
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"-grsec" + optionalString cfg.config.verboseVersion
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"-${grkern.grversion}-${grkern.revision}";
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grsecurityOverrider = args: grkern: {
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# Apparently as of gcc 4.6, gcc-plugin headers (which are needed by PaX plugins)
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# include libgmp headers, so we need these extra tweaks
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buildInputs = args.buildInputs ++ [ pkgs.gmp ];
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preConfigure = ''
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${args.preConfigure or ""}
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sed -i 's|-I|-I${pkgs.gmp}/include -I|' scripts/gcc-plugin.sh
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sed -i 's|HOST_EXTRACFLAGS +=|HOST_EXTRACFLAGS += -I${pkgs.gmp}/include|' tools/gcc/Makefile
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sed -i 's|HOST_EXTRACXXFLAGS +=|HOST_EXTRACXXFLAGS += -I${pkgs.gmp}/include|' tools/gcc/Makefile
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rm localversion-grsec
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echo ${localver grkern} > localversion-grsec
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'';
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};
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mkGrsecKern = grkern:
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lowPrio (overrideDerivation (grkern.kernel.override (args: {
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kernelPatches = args.kernelPatches ++ [ grkern.patch pkgs.kernelPatches.grsec_fix_path ];
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argsOverride = {
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modDirVersion = "${grkern.kernel.modDirVersion}${localver grkern}";
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};
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extraConfig = grsecConfig;
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features.grsecurity = true;
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})) (args: grsecurityOverrider args grkern));
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mkGrsecPkg = grkern: pkgs.linuxPackagesFor grkern (mkGrsecPkg grkern);
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## -- Kernel packages ------------------------------------------------------
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grsecKernel = mkGrsecKern grKernel;
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grsecPackage = mkGrsecPkg grsecKernel;
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};
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in vals
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