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Seccomp filtering and the no-new-privileges functionality improve the security
of the sandbox, and have been enabled by default for a long time. In
https://git.lix.systems/lix-project/lix/issues/265 it was decided that they
should be enabled unconditionally. Accordingly, remove the allow-new-privileges
(which had weird behavior anyway) and filter-syscall settings, and force the
security features on. Syscall filtering can still be enabled at build time to
support building on architectures libseccomp doesn't support.
Change-Id: Iedbfa18d720ae557dee07a24f69b2520f30119cb
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Fixes #321.
Change-Id: I60812aec9f9b68ab742413835c581d3b53432b9b
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Fixes #183, #110, #116.
The default flake-registry option becomes 'vendored', and refers
to a vendored flake-registry.json file in the install path.
Vendored copy of the flake-registry is from github:NixOS/flake-registry
at commit 9c69f7bd2363e71fe5cd7f608113290c7614dcdd.
Change-Id: I752b81c85ebeaab4e582ac01c239d69d65580f37
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Fixes https://git.lix.systems/lix-project/lix/issues/268
Change-Id: I3f1b0ddf064f891cca8b53229c5c31c74cea3d9f
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This was found when `logrotate.conf` failed to build in a NixOS system
with:
/nix/store/26zdl4pyw5qazppj8if5lm8bjzxlc07l-coreutils-9.3/bin/id: cannot find name for group ID 30000
This was surprising because it seemed to mean that /etc/group was busted
in the sandbox. Indeed it was:
root:x:0:
nixbld:!:100:
nogroup:x:65534:
We diagnosed this to sandboxUid() being called before
usingUserNamespace() was called, in setting up /etc/group inside the
sandbox. This code desperately needs refactoring.
We also moved the /etc/group code to be with the /etc/passwd code, but
honestly this code is all spaghetti'd all over the place and needs some
more serious tidying than we did here.
We also moved some checks to be earlier to improve locality with where
the things they are checking come from.
Change-Id: Ie29798771f3593c46ec313a32960fa955054aceb
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binaries" into main
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With Linux kernel >=6.6 & glibc 2.39 a `fchmodat2(2)` is available that
isn't filtered away by the libseccomp sandbox.
Being able to use this to bypass that restriction has surprising results
for some builds such as lxc[1]:
> With kernel ≥6.6 and glibc 2.39, lxc's install phase uses fchmodat2,
> which slips through https://github.com/NixOS/nix/blob/9b88e5284608116b7db0dbd3d5dd7a33b90d52d7/src/libstore/build/local-derivation-goal.cc#L1650-L1663.
> The fixupPhase then uses fchmodat, which fails.
> With older kernel or glibc, setting the suid bit fails in the
> install phase, which is not treated as fatal, and then the
> fixup phase does not try to set it again.
Please note that there are still ways to bypass this sandbox[2] and this is
mostly a fix for the breaking builds.
This change works by creating a syscall filter for the `fchmodat2`
syscall (number 452 on most systems). The problem is that glibc 2.39
is needed to have the correct syscall number available via
`__NR_fchmodat2` / `__SNR_fchmodat2`, but this flake is still on
nixpkgs 23.11. To have this change everywhere and not dependent on the
glibc this package is built against, I added a header
"fchmodat2-compat.hh" that sets the syscall number based on the
architecture. On most platforms its 452 according to glibc with a few
exceptions:
$ rg --pcre2 'define __NR_fchmodat2 (?!452)'
sysdeps/unix/sysv/linux/x86_64/x32/arch-syscall.h
58:#define __NR_fchmodat2 1073742276
sysdeps/unix/sysv/linux/mips/mips64/n32/arch-syscall.h
67:#define __NR_fchmodat2 6452
sysdeps/unix/sysv/linux/mips/mips64/n64/arch-syscall.h
62:#define __NR_fchmodat2 5452
sysdeps/unix/sysv/linux/mips/mips32/arch-syscall.h
70:#define __NR_fchmodat2 4452
sysdeps/unix/sysv/linux/alpha/arch-syscall.h
59:#define __NR_fchmodat2 562
I added a small regression-test to the setuid integration-test that
attempts to set the suid bit on a file using the fchmodat2 syscall.
I confirmed that the test fails without the change in
local-derivation-goal.
Additionally, we require libseccomp 2.5.5 or greater now: as it turns
out, libseccomp maintains an internal syscall table and
validates each rule against it. This means that when using libseccomp
2.5.4 or older, one may pass `452` as syscall number against it, but
since it doesn't exist in the internal structure, `libseccomp` will refuse
to create a filter for that. This happens with nixpkgs-23.11, i.e. on
stable NixOS and when building Lix against the project's flake.
To work around that
* a backport of libseccomp 2.5.5 on upstream nixpkgs has been
scheduled[3].
* the package now uses libseccomp 2.5.5 on its own already. This is to
provide a quick fix since the correct fix for 23.11 is still a staging cycle
away.
We still need the compat header though since `SCMP_SYS(fchmodat2)`
internally transforms this into `__SNR_fchmodat2` which points to
`__NR_fchmodat2` from glibc 2.39, so it wouldn't build on glibc 2.38.
The updated syscall table from libseccomp 2.5.5 is NOT used for that
step, but used later, so we need both, our compat header and their
syscall table 🤷
Relevant PRs in CppNix:
* https://github.com/NixOS/nix/pull/10591
* https://github.com/NixOS/nix/pull/10501
[1] https://github.com/NixOS/nixpkgs/issues/300635#issuecomment-2031073804
[2] https://github.com/NixOS/nixpkgs/issues/300635#issuecomment-2030844251
[3] https://github.com/NixOS/nixpkgs/pull/306070
(cherry picked from commit ba6804518772e6afb403dd55478365d4b863c854)
Change-Id: I6921ab5a363188c6bff617750d00bb517276b7fe
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This commit adds a new NixOS VM test, which tests that `nix upgrade-nix`
works on both kinds of profiles (manifest.nix and manifest.json).
Done as a separate commit from 831d18a13, since it relies on the
--store-path argument from 026c90e5f as well.
Change-Id: I5fc94b751d252862cb6cffb541a4c072faad9f3b
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That's expected by `build-remote` and makes sure that errors are
correctly forwarded to the user. For instance, let's say that the
host-key of `example.org` is unknown and
nix-build ../nixpkgs -A hello -j0 --builders 'ssh-ng://example.org'
is issued, then you get the following output:
cannot build on 'ssh-ng://example.org?&': error: failed to start SSH connection to 'example.org'
Failed to find a machine for remote build!
derivation: yh46gakxq3kchrbihwxvpn5bmadcw90b-hello-2.12.1.drv
required (system, features): (x86_64-linux, [])
2 available machines:
[...]
The relevant information (`Host key verification failed`) ends up in the
daemon's log, but that's not very obvious considering that the daemon
isn't very chatty normally.
This can be fixed - the same way as its done for legacy-ssh - by passing
fd 4 to the SSH wrapper. Now you'd get the following error:
cannot build on 'ssh-ng://example.org': error: failed to start SSH connection to 'example.org': Host key verification failed.
Failed to find a machine for remote build!
[...]
...and now it's clear what's wrong.
Please note that this is won't end up in the derivation's log.
For previous discussion about this change see
https://github.com/NixOS/nix/pull/7659.
Change-Id: I5790856dbf58e53ea3e63238b015ea06c347cf92
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In hopes of avoiding opaque error messages like the one in
https://buildbot.lix.systems/#/builders/49/builds/1054/steps/1/logs/stdio
Traceback (most recent call last):
File "/nix/store/wj6wh89jhd2492r781qsr09r9wydfs6m-nixos-test-driver-1.1/bin/.nixos-test-driver-wrapped", line 9, in <module>
sys.exit(main())
^^^^^^
File "/nix/store/wj6wh89jhd2492r781qsr09r9wydfs6m-nixos-test-driver-1.1/lib/python3.11/site-packages/test_driver/__init__.py", line 126, in main
driver.run_tests()
File "/nix/store/wj6wh89jhd2492r781qsr09r9wydfs6m-nixos-test-driver-1.1/lib/python3.11/site-packages/test_driver/driver.py", line 159, in run_tests
self.test_script()
File "/nix/store/wj6wh89jhd2492r781qsr09r9wydfs6m-nixos-test-driver-1.1/lib/python3.11/site-packages/test_driver/driver.py", line 151, in test_script
exec(self.tests, symbols, None)
File "<string>", line 13, in <module>
AssertionError
Change-Id: Idd2212a1c3714ce58c7c3a9f34c2ca4313eb6d55
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This isn't necessary, as it's already covered by the tarball fetcher's
cache.
Change-Id: I85e35f5a61594f27b8f30d82145f92c5d6559e1f
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these should really wait for networks to come up, otherwise they can fail.
fixes #235
Change-Id: I08989e8bdb0de280df74660ac43983de5c34fa9d
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Change-Id: I711f64e2b68495ed9c85c1a4bd5025405805e43a
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Saves us a bunch of thinking about how to handle symlinks, and prevents
the DNS config from changing on the fly under the build, which may or may
not be a good thing?
Change-Id: I071e6ae7e220884690b788d94f480866f428db71
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The big ones here are `trim-trailing-whitespace` and `end-of-file-fixer`
(which makes sure that every file ends with exactly one newline
character).
Change-Id: Idca73b640883188f068f9903e013cf0d82aa1123
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without these changes the tests will very repeatably (although not very
reliably) wedge in our runs. the ssh command starts, opens a sessions,
does something, the session closes again, but the test does not move on.
adding *just* the redirect and not the unit waits is not sufficient
either, it needs both. this feels like a bug in the nixos testing
framework somewhere, but digging that far is not in the cards right now.
Change-Id: Idab577b83a36cc4899bb5ffbb3d9adc04e83e51c
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This also bypasses the Objective-C fork safety during tests.
Change-Id: I92bf9f911e8a1fbd32eae13255f9a9dabde40b21
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initialize test suite for git fetchers
(cherry picked from commit 0bd9e10aea747df51c8a5af124864c722cbeafde)
Change-Id: Idf94a47794190c3e1de07fc4e7848741c4e9ffed
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Fix warnings when running checks
(cherry picked from commit 75e10e42f3c63fd9b9c8cf222b992ab77e497854)
Change-Id: Id955008fe045f23f72fae2a2cdf8f7ccddd1e6b9
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(cherry picked from commit 5167351efbee5c5a7390510eb720c31c6976f4d9)
Change-Id: I0caba23b589ed428d08895d7b8f0c22532bd259e
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(cherry picked from commit e502d1cf945fb3cdd0ca1e1c16ec330ccab51c7b)
Change-Id: If6a1758b6457c5dae9305829c4d71d1905cfca22
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Include phase reporting in log file for ssh-ng builds
(cherry picked from commit b1e7d7cad625095656fff05ac4aedeb12135110a)
Change-Id: I4076669b0ba160412f7c628ca9113f9abbc8c303
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It is possible to exfiltrate a file descriptor out of the build sandbox
of FODs, and use it to modify the store path after it has been
registered. To avoid that issue, don't register the output of the build,
but a copy of it (that will be free of any leaked file descriptor).
Test that we can't leverage abstract unix domain sockets to leak file
descriptors out of the sandbox and modify the path after it has been
registered.
(cherry picked from commit 2dadfeb690e7f4b8f97298e29791d202fdba5ca6)
(tests cherry picked from commit c854ae5b3078ac5d99fa75fe148005044809e18c)
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
Co-authored-by: Theophane Hufschmitt <theophane.hufschmitt@tweag.io>
Co-authored-by: Tom Bereknyei <tomberek@gmail.com>
Change-Id: I87cd58f1c0a4f7b7a610d354206b33301e47b1a4
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Define NixOS tests in `tests/nixos/default.nix` rather than `flake.nix`
(cherry picked from commit c29b8ba142a0650d1182ca838ddc1b2d273dcd2a)
Change-Id: Ieae1b6476d95024485df7067e008013bc5542039
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It was disabled in c6953d1ff62fb6dc4fbd89c03e7949c552c19382 because
a recent Nixpkgs bump brought in a new systemd which changed how
systemd-nspawn worked.
As far as I can tell, the issue was caused by this upstream systemd
commit:
https://github.com/systemd/systemd/commit/b71a0192c040f585397cfc6fc2ca025bf839733d
Bind-mounting the host's `/sys` and `/proc` into the container's
`/run/host/{sys,proc}` fixes the issue and allows the test to succeed.
(cherry picked from commit 883092e3f78d4efb1066a2e24e343b307035a04c)
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https://hydra.nixos.org/build/235888160
This is needed because Nixpkgs now contains dangling symlinks
(pkgs/test/nixpkgs-check-by-name/tests/symlink-invalid/pkgs/by-name/fo/foo/foo.nix).
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This is broken because of a change in systemd in NixOS 23.05. It fails
with
Failed to mount proc (type proc) on /proc (MS_NOSUID|MS_NODEV|MS_NOEXEC ""): Operation not permitted
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Pass NIX_SSHOPTS when checking for an ssh master connection.
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User can now sign path as unprivileged/allowed user
refs #1708
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Previously, for tarball flakes, we recorded the original URL of the
tarball flake, rather than the URL to which it ultimately
redirects. Thus, a flake URL like
http://example.org/patchelf-latest.tar that redirects to
http://example.org/patchelf-<revision>.tar was not really usable. We
couldn't record the redirected URL, because sites like GitHub redirect
to CDN URLs that we can't rely on to be stable.
So now we use the redirected URL only if the server returns the
`x-nix-is-immutable` or `x-amz-meta-nix-is-immutable` headers in its
response.
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This highlights a problem caused by SSHMaster::isMasterRunning returning
false when NIX_SSHOPTS contains -oControlPath.
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Check that nix copy can copy stuff, refuses to copy unsigned paths by
default, and doesn't hide the ssh password prompt.
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Fix PID namespace support check
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Co-authored-by: Théophane Hufschmitt <7226587+thufschmitt@users.noreply.github.com>
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This will allow contributors to find them more easily.
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