Adds an option `security.lockKernelModules` that, when enabled, disables
kernel module loading once the system reaches its normal operating state.
The rationale for this over simply setting the sysctl knob is to allow
some legitmate kernel module loading to occur; the naive solution breaks
too much to be useful.
The benefit to the user is to help ensure the integrity of the kernel
runtime: only code loaded as part of normal system initialization will be
available in the kernel for the duration of the boot session. This helps
prevent injection of malicious code or unexpected loading of legitimate
but normally unused modules that have exploitable bugs (e.g., DCCP use
after free CVE-2017-6074, n_hldc CVE-2017-2636, XFRM framework
CVE-2017-7184, L2TPv3 CVE-2016-10200).
From an aestethic point of view, enabling this option helps make the
configuration more "declarative".
Closes https://github.com/NixOS/nixpkgs/pull/24681
Use a solid black background when no background image (via
~/.background-image) is provided. In my case this fixes the really
strange behaviour when i3 without a desktop manager starts with the SDDM
login screen as background image.
This eliminates a theoretical risk of ASLR bypass due to the fixed address
mapping used by the legacy vsyscall mechanism. Modern glibc use vdso(7)
instead so there is no loss of functionality, but some programs may fail
to run in this configuration. Programs that fail to run because vsyscall
has been disabled will be logged to dmesg.
For background on virtual syscalls see https://lwn.net/Articles/446528/
Closes https://github.com/NixOS/nixpkgs/pull/25289
The xsession script was called with inconsistent (depending on the
display managers) and wrong parameters. The main reason for this where
the spaces the parameter syntax. In order to fix this the old syntax:
$1 = '<desktop-manager> + <window-manager>'
Will be replaced with a new syntax:
$1 = "<desktop-manager>+<window-manager>"
This assumes that neither "<desktop-manager>" nor "<window-manager>"
contain the "+" character but this shouldn't be a problem.
This patch also fixes the quoting by using double quotes (") instead of
single quotes (') [0].
Last but not least this'll add some comments for the better
understanding of the script.
[0]: https://specifications.freedesktop.org/desktop-entry-spec/latest/ar01s06.html
Upstream has decided to make -testing patches private, effectively ceasing
free support for grsecurity/PaX [1]. Consequently, we can no longer
responsibly support grsecurity on NixOS.
This patch turns the kernel and patch expressions into build errors and
adds a warning to the manual, but retains most of the infrastructure, in
an effort to make the transition smoother. For 17.09 all of it should
probably be pruned.
[1]: https://grsecurity.net/passing_the_baton.php
The xen-bridge service accepts the option prefixLength, but does not
use it to set the actual netmask on the bridge. This commit makes
it set the correct netmask.
Right now the `programs.zsh.syntax-highlighting.highlighters` option
lacks appropriate validation which can cause confusing things when
mistyping a higlighter for zsh-syntax-highlighting.
Someone on IRC wanted to boot Fedora from another disk. While I'm not
too familiar with UEFI booting in conjunction with GRUB2 it took some
time to get it to work.
So in order to safe others from frustration I'm adding this as another
example to the extraEntries option.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
QEMU can allow guests to access more than one host core at a time.
Previously, this had to be done via ad-hoc arguments:
virtualisation.qemu.options = ["-smp 12"];
Now you can simply specify:
virtualisation.cores = 12;
It was asked by @CMCDragonkai to elaborate on that, so let's just do
this by actually providing a code comment.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Using invalid module options in the submodule isn't very nice, because
it doesn't give very useful errors in case of type mismatch, also we
don't get descriptions of these options as they're effecively
nonexistent to the module system. Another downside of this is that
merging of these options isn't done correctly as well (eg. for
types.lines).
So we now have proper submodules for each xrandrHead and we also use
corcedTo in the type of xrandrHeads so that we can populate the
submodule's "output" option in case a plain string is defined for a list
item.
Instead of silently skipping multiple primary heads, we now have an
assertion, which displays a message and aborts configuration evaluation
appropriately.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
This changes much of the make-disk-image.nix logic (and thus most NixOS
image building) to use LKL to set up the target directory structure rather
than a Linux VM. The only work we still do in a VM is less IO-heavy stuff
that while still time-consuming, is less of the overall load. The goal is
to kill more of that stuff, but that will require deeper changes to NixOS
activation scripts and switch-to-configuration.pl, and I don't want to
bite off too much at once.
* programs.zsh: factor zsh-syntax-highlighting out into its own module
* programs.zsh.syntax-highlighting: add `highlighters` option
* programs.zsh: document BC break introduced by moving zsh-syntax-completion into its own module
The main change here is a patch of SLiM to tread a log file of
/dev/stderr specially in that it now uses std::cerr instead of a file
for logging.
This allows us to set the logfile to stderr in NixOS for the generated
SLiM configuration file and we now get logging to the systemd journal.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
* programs.zsh: add enableOhMyZsh option to automate setup of oh-my-zsh in global zshrc
* programs.zsh: make oh-my-zsh plugins configurable
* programs.zsh: add ohMyZshCustom option
* programs.zsh: add ohMyZshTheme option
* programs.zsh: applying minor fixes to evaluate expressions properly
* programs.zsh: fix ordering of oh-my-zsh config and execution
* programs.zsh: move all oh-my-zsh params into its own scope named programs.zsh.oh-my-zsh
The idea is to provide a convenient way to enable most vanilla hardening
features in one go. The hardened profile, then, will serve as a place for
features that enhance security but cannot be enabled for all deployments
because they interfere with legitimate use cases (e.g., using ptrace to
debug problems in an already running process).
Closes https://github.com/NixOS/nixpkgs/pull/24680
This reverts commit 6b7c5ba535.
Unfortunately it seems like this broke slim, lightdm and gdm (see #25068
and #23264). This is already reverted in the 17.03 branch (99dfb6d).
TODO: We need tests for slim and lightdm and fix the test for gdm
(failing since 2016-10-26) to prevent such breakage in the future.
- adds distro dependency
- buildbot nodaemon in service module
- fakerepo for module tests
- service module parameter fixup
- tested on nixos
- tested on darwin
This has surfaced since d990aa7163.
The "simpleUefiGummiboot" installer test fails since this commit,
because that commit introduced a small check to verify whether the store
was altered.
While installing NixOS for the first time, the store is usually in
/mnt/nix/store and without the read-only bind mount that's preventing
programs from altering the store.
So after nixos-install is done creating the system closure and setting
it as the active system profile, the bootloader is written from the
closure inside the chroot. The systemd-boot-builder is invoked during
this step, which adds .pyc files for various Python modules of the
Python 3 store path, which in turn invalidates the hash of the Python 3
store path itself.
At the time the system is booted up again, the nix-store is verified and
fails with something like this:
path /nix/store/zvm545rqc4d97caqq9h7344bnd06jhzb-python3-3.5.3 was
modified! expected hash
b2c975f4b8d197443fbb09690fb3f6545e165dd44c9309d7d6df2fce0579ebeb, got
bccca19f39c9d26d857ccf1fb72818b2b817967e6d497a25a1283e36ed0acf01
Running the interpreter with the -B argument prevents Python from
writing those byte code files:
https://docs.python.org/3/using/cmdline.html#cmdoption-B
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
This reverts commit c2b56626f1.
It broke creating the manual. I suspect the descriptions are
auto-wrapped by <para> and </para>.
We've been through this already in 3af715af90.
/cc #24978, @zraexy, @Mic92.
