nixpkgs/nixos/modules/security/grsecurity.nix

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{ config, pkgs, lib, ... }:
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
with lib;
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
let
cfg = config.security.grsecurity;
grsecLockPath = "/proc/sys/kernel/grsecurity/grsec_lock";
# Ascertain whether ZFS is required for booting the system; grsecurity is
# currently incompatible with ZFS, rendering the system unbootable.
zfsNeededForBoot = filter
(fs: (fs.neededForBoot
|| elem fs.mountPoint [ "/" "/nix" "/nix/store" "/var" "/var/log" "/var/lib" "/etc" ])
&& fs.fsType == "zfs")
(attrValues config.fileSystems) != [];
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
in
{
options.security.grsecurity = {
enable = mkEnableOption "Grsecurity/PaX";
lockTunables = mkOption {
type = types.bool;
example = false;
default = true;
description = ''
Whether to automatically lock grsecurity tunables
(<option>boot.kernel.sysctl."kernel.grsecurity.*"</option>). Disable
this to allow configuration of grsecurity features while the system is
running. The lock can be manually engaged by activating the
<literal>grsec-lock</literal> service unit.
'';
};
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
};
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
config = mkIf cfg.enable {
# Allow the user to select a different package set, subject to the stated
# required kernel config
boot.kernelPackages = mkDefault pkgs.linuxPackages_grsec_nixos;
system.requiredKernelConfig = with config.lib.kernelConfig;
[ (isEnabled "GRKERNSEC")
(isEnabled "PAX")
(isYES "GRKERNSEC_SYSCTL")
(isYES "GRKERNSEC_SYSCTL_DISTRO")
];
# Install PaX related utillities into the system profile. Eventually, we
# also want to include gradm here.
environment.systemPackages = with pkgs; [ paxctl pax-utils ];
# Install rules for the grsec device node
services.udev.packages = [ pkgs.gradm ];
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
# This service unit is responsible for locking the Grsecurity tunables. The
# unit is always defined, but only activated on bootup if lockTunables is
# toggled. When lockTunables is toggled, failure to activate the unit will
# enter emergency mode. The intent is to make it difficult to silently
# enter multi-user mode without having locked the tunables. Some effort is
# made to ensure that starting the unit is an idempotent operation.
systemd.services.grsec-lock = {
description = "Lock grsecurity tunables";
wantedBy = optional cfg.lockTunables "multi-user.target";
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
wants = [ "local-fs.target" "systemd-sysctl.service" ];
after = [ "local-fs.target" "systemd-sysctl.service" ];
conflicts = [ "shutdown.target" ];
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
restartIfChanged = false;
script = ''
if ${pkgs.gnugrep}/bin/grep -Fq 0 ${grsecLockPath} ; then
echo -n 1 > ${grsecLockPath}
fi
'';
unitConfig = {
ConditionPathIsReadWrite = grsecLockPath;
DefaultDependencies = false;
} // optionalAttrs cfg.lockTunables {
OnFailure = "emergency.target";
};
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
};
};
# Configure system tunables
boot.kernel.sysctl = {
# Removed under grsecurity
"kernel.kptr_restrict" = mkForce null;
} // optionalAttrs config.nix.useSandbox {
# chroot(2) restrictions that conflict with sandboxed Nix builds
"kernel.grsecurity.chroot_caps" = mkForce 0;
"kernel.grsecurity.chroot_deny_chroot" = mkForce 0;
"kernel.grsecurity.chroot_deny_mount" = mkForce 0;
"kernel.grsecurity.chroot_deny_pivot" = mkForce 0;
} // optionalAttrs config.boot.enableContainers {
# chroot(2) restrictions that conflict with NixOS lightweight containers
"kernel.grsecurity.chroot_deny_chmod" = mkForce 0;
"kernel.grsecurity.chroot_deny_mount" = mkForce 0;
"kernel.grsecurity.chroot_restrict_nice" = mkForce 0;
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
};
assertions = [
{ assertion = !zfsNeededForBoot;
message = "grsecurity is currently incompatible with ZFS";
}
];
nixos: add grsecurity module (#1875) 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>
2014-04-06 19:18:12 +00:00
};
}