Commit graph

51 commits

Author SHA1 Message Date
Joachim Fasting 071fbcda24
grsecurity: enable optional sysfs restrictions
Fairly severe, but can be disabled at bootup via
grsec_sysfs_restrict=0. For the NixOS module we ensure that it is
disabled, for systemd compatibility.
2016-12-06 01:23:36 +01:00
Joachim Fasting 8c1f5afdf3
grsecurity: delay toggling of sysctls until system is up
We generally trust init, so there's little point in having these enabled
during early bootup; it accomplishes little except fill our logs with
spam.
2016-12-06 01:22:53 +01:00
Joachim Fasting e99228db30
grsecurity module: force a known good kernel package set
Previously, we would only set a default value, on the theory that
`boot.kernelPackages` could be used to sanely configure a custom grsec
kernel.  Regrettably, this is not the case and users who expect e.g.,
`boot.kernelPackages = pkgs.linuxPackages_latest` to work will end up
with a non-grsec kernel (this problem has come up twice on the bug
tracker recently).

With this patch, `security.grsecurity.enable = true` implies
`boot.kernelPackages = linuxPackages_grsec_nixos` and any customization
must be done via package override or by eschewing the module.
2016-11-28 12:11:04 +01:00
Joachim Fasting 2eb6ec1bc4
grsecurity module: remove code pertaining to zfs
I don't know if it still the case that zfs fails to boot; either way,
that's the user's responsibility to contend with.
2016-11-20 23:01:22 +01:00
Joachim Fasting 98935c7103
grsecurity module: remove requiredKernelConfig
Using a custom package set with the NixOS module is no longer
something I wish to support.  It's still *possible* but not
advertised.  Secondly, the requiredKernelConfig didn't really
do anything (setting kernelPackages to a non-grsec kernel would
just silently let the user boot into a non-grsec setup ...).
2016-11-20 23:00:41 +01:00
Joachim Fasting 5ad8a56d16
grsecurity module: remove use of mkEnableOption 2016-11-20 23:00:24 +01:00
Timofei Kushnir faa6f9b6b3 grsecurity: fix 'isYes' and 'isNo' 2016-10-29 14:26:06 +03:00
Joachim Fasting 269f739ded
grsecurity module: set nixpkgs.config.grsecurity = true 2016-09-05 00:56:17 +02:00
Joachim Fasting dab32a1fa6
nixos manual: move chapter on grsecurity to auto-generated module docs 2016-08-29 23:48:12 +02:00
Jan Malakhovski 65d26c4dc1 nixos: apply toposort to fileSystems to support bind and move mounts
And use new `config.system.build.fileSystems` property everywhere.
2016-08-23 18:14:05 +00:00
Joachim Fasting 050b7eec16
grsecurity module: systemd-nspawn requires cap_sys_admin
As with 9ca3504a798291fbd7c49fcfeec8b64daa2022ad

Closes https://github.com/NixOS/nixpkgs/issues/17714
2016-08-15 20:36:47 +02:00
Joachim Fasting 7fd99066c4
grsecurity module: permit chmod +s in sandboxed builds
While useless, some builds may dabble with setuid bits (e.g.,
util-linux), which breaks under grsec.  In the interest of user
friendliness, we once again compromise by disabling an otherwise useful
feature ...

Closes https://github.com/NixOS/nixpkgs/issues/17501
2016-08-15 20:36:47 +02:00
Joachim Fasting 43fc394a5c
grsecurity module: disable EFI runtime services by default
Enabling EFI runtime services provides a venue for injecting code into
the kernel.

When grsecurity is enabled, we close this by default by disabling access
to EFI runtime services.  The upshot of this is that
/sys/firmware/efi/efivars will be unavailable by default (and attempts
to mount it will fail).

This is not strictly a grsecurity related option, it could be made into
a general option, but it seems to be of particular interest to
grsecurity users (for non-grsecurity users, there are other, more
immediate kernel injection attack dangers to contend with anyway).
2016-08-02 10:24:49 +02:00
Joachim Fasting d1572d06fe
grsecurity module: correct internal note 2016-08-01 16:27:14 +02:00
Joachim Fasting 96542a1b00
grsecurity module: assert RBAC support in kernel 2016-07-24 12:54:07 +02:00
Joachim Fasting 5ece58ed66
grsecurity module: add gradm to system path 2016-07-24 12:54:07 +02:00
Joachim Fasting 59c9a88a6b
grsecurity module: tweak lockTunables option description 2016-07-16 11:11:35 +02:00
Joachim Fasting cef7150bc7
grsecurity module: grsecurity is not capitalized mid-sentence 2016-07-16 11:11:35 +02:00
Joachim Fasting 94824303be
grsecurity module: smarter container support
Only set tunables required for container support if there are any containers.
2016-07-16 11:11:35 +02:00
Joachim Fasting c606b9876f
grsecurity module: enforce size overflows by default
It is better to make this conditional on whether the configuration contains a
known size overflow that could prevent the system from booting.
2016-07-16 11:11:35 +02:00
Joachim Fasting 0677cc61c8
nixos: rewrite the grsecurity module
The new module is specifically adapted to the NixOS Grsecurity/PaX
kernel.  The module declares the required kernel configurations and
so *should* be somewhat compatible with custom Grsecurity kernels.

The module exposes only a limited number of options, minimising the need
for user intervention beyond enabling the module. For experts,
Grsecurity/PaX behavior may be configured via `boot.kernelParams` and
`boot.kernel.sysctl`.

The module assumes the user knows what she's doing (esp. if she decides
to modify configuration values not directly exposed by the module).

Administration of Grsecurity's role based access control system is yet
to be implemented.
2016-06-14 03:38:12 +02:00
Joachim Fasting d4d7bfe07b
grsecurity: add option to disable chroot caps restriction
The chroot caps restriction disallows chroot'ed processes from running
any command that requires `CAP_SYS_ADMIN`, breaking `nixos-rebuild`. See
e.g., https://github.com/NixOS/nixpkgs/issues/15293

This significantly weakens chroot protections, but to break
nixos-rebuild out of the box is too severe.
2016-05-10 16:17:08 +02:00
Joachim Fasting da767356f2
grsecurity: support disabling TCP simultaneous connect
Defaults to OFF because disabling TCP simultaneous connect breaks some
legitimate use cases, notably WebRTC [1], but it's nice to provide the
option for deployments where those features are unneeded anyway.

This is an alternative to https://github.com/NixOS/nixpkgs/pull/4937

[1]: http://article.gmane.org/gmane.linux.documentation/9425
2016-05-04 03:53:24 +02:00
Joachim Fasting 60a27781d6
grsecurity module: fix grsec-lock unit ordering
Requirement without ordering implies parallel execution; it is crucial
that sysctl tunables are finalized before the lock is engaged, however.
2016-05-02 11:28:24 +02:00
Domen Kožar 77ae55308c fix installer tests #13559 2016-03-12 20:19:40 +00:00
tg(x) be3bd972d5 grsecurity: add 4.1 kernel 2016-02-28 15:00:16 +01:00
tg(x) 38614d3f6a grsecurity: use kernel version instead of testing / stable 2016-02-28 04:10:59 +01:00
Ricardo M. Correia aa75bb25d8 grsecurity: Update stable and test patches
stable: 3.1-3.14.41-201505072056 -> 3.1-3.14.41-201505101121
test:   3.1-4.0.2-201505072057   -> 3.1-4.0.2-201505101122
2015-05-11 02:45:38 +02:00
Austin Seipp 8d3b8d0dc8 Merge pull request #7149 from joachifm/grsec-gradm-optional
grsecurity module: configure gradm iff RBAC is enabled
2015-04-13 17:11:29 -05:00
Austin Seipp b86f6a3ed6 Merge pull request #7148 from joachifm/grsec-trivial
grsecurity module: trivial improvements
2015-04-13 17:10:47 -05:00
Joachim Fasting 3e847d512d grsecurity module: configure gradm iff RBAC is enabled 2015-04-03 13:45:57 +02:00
Joachim Fasting ba93a75724 grsecurity module: use types.enum
Also
- set desktop as default system
- make virtualisationSoftware nullOr
- make virtualisationConfig nullOr
2015-04-03 13:45:45 +02:00
Joachim Fasting 66c4f51046 grsecurity module: simplify assertion 2015-04-03 13:38:32 +02:00
Joachim Fasting 2e88605a91 grsecurity module: remove reference to systemd-sysctl
First, that's not what the service is called, and secondly it's
most likely irrelevant to the user.
2015-04-03 13:38:32 +02:00
Ricardo M. Correia 7c8247a8c5 grsecurity: Update stable and test patches
stable: 3.1-3.14.35-201503071140 -> 3.1-3.14.35-201503092203
test:   3.1-3.18.9-201503071142  -> 3.1-3.19.1-201503122205
2015-03-15 03:49:58 +01:00
Joachim Fasting 18320d3b21 nixos: fix grsec-lock requires 2015-03-02 18:39:04 +01:00
Joachim Fasting ccd6f5a313 nixos: make the grsec-lock unit depend on the path it writes to
The grsec-lock unit fails unless /proc/sys/kernel/grsecurity/grsec_lock
exists and so prevents switching into a new configuration after enabling
grsecurity.sysctl.
2015-03-02 18:39:01 +01:00
Ricardo M. Correia a11dc2f0a3 grsecurity: Add denyUSB option to grsec NixOS module
The option had been added to the grsec build-support code,
but it hadn't been added to the grsec module.

After this commit, grsec module users will be able to change
the default value. It also serves to document that this option
exists and that NixOS will disable it by default.
2015-01-20 19:18:06 +01:00
Ricardo M. Correia 1d44322d53 grsecurity: Update stable and test patches
stable: 3.0-3.14.27-201412211908 -> 3.0-3.14.27-201412280859
test:   3.0-3.17.7-201412211910  -> 3.0-3.18.1-201412281149
2014-12-29 03:00:47 +01:00
Ricardo M. Correia 389143d808 grsecurity: Update assertion msg to correct major kernel versions 2014-11-16 18:52:39 +01:00
Ricardo M. Correia 10348a0f2c grsecurity: Update documentation to mention correct kernels 2014-10-22 16:50:36 +02:00
Rastus Vernon d5daa8ae6f Fix repeated typo
"Can either by" should be "Can either be". There are three occurrences of this mistake, all in descriptions of configuration options.
2014-07-11 23:14:53 -04:00
Austin Seipp 0399c5ee24 grsecurity: update stable/testing kernels, refactoring
This updates the new stable kernel to 3.14, and the new testing kernel
to 3.15.

This also removes the vserver kernel, since it's probably not nearly as
used.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
2014-06-22 22:29:10 -05:00
Ricardo M. Correia f0cf8f4140 grsecurity: Fix module evaluation 2014-05-22 20:17:34 +02:00
Austin Seipp 67c309fe75 Fix fallout from 4f27ad14
Signed-off-by: Austin Seipp <aseipp@pobox.com>
2014-05-18 07:38:13 -05:00
Austin Seipp 4f27ad14a1 grsec: refactor grsecurity packages
This now provides a handful of different grsecurity kernels for slightly
different 'flavors' of packages. This doesn't change the grsecurity
module to use them just yet, however.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
2014-05-17 14:09:43 -05:00
Austin Seipp 92abc4c610 kernel: enable AppArmor by default
AppArmor only requires a few patches to the 3.2 and 3.4 kernels in order
to work properly (with the minor catch grsecurity -stable includes the
3.2 patches.) This adds them to the kernel builds by default, removes
features.apparmor (since it's always true) and makes it the default MAC
system.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
2014-05-17 14:09:09 -05:00
Ricardo M. Correia 5d5ca7b260 grsecurity: Update all patches
stable:  3.0-3.2.57-201404131252            -> 3.0-3.2.57-201404182109
test:    3.0-3.13.10-201404141717           -> 3.0-3.14.1-201404201132
vserver: 3.0-3.2.57-vs2.3.2.16-201404131253 -> 3.0-3.2.57-vs2.3.2.16-201404182110
2014-04-21 18:46:41 +02:00
Eelco Dolstra 29027fd1e1 Rewrite ‘with pkgs.lib’ -> ‘with lib’
Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
2014-04-14 16:26:48 +02:00
Austin Seipp 64efd184ed grsecurity: Fix GRKERNSEC_PROC restrictions
Previously we were setting GRKERNSEC_PROC_USER y, which was a little bit
too strict. It doesn't allow a special group (e.g. the grsecurity group
users) to access /proc information - this requires
GRKERNSEC_PROC_USERGROUP y, and the two are mutually exclusive.

This was also not in line with the default automatic grsecurity
configuration - it actually defaults to USERGROUP (although it has a
default GID of 1001 instead of ours), not USER.

This introduces a new option restrictProcWithGroup - enabled by default
- which turns on GRKERNSEC_PROC_USERGROUP instead. It also turns off
restrictProc by default and makes sure both cannot be enabled.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
2014-04-12 11:16:05 -05:00