nixos/nfs: Allow Kerberized NFS #73989

kwohlfahrt · 2019-11-23T22:08:48Z

Motivation for this change

Currently, NFS mounts secured with Kerberos do not work (see #72722).

Things done

Notify maintainers

cc @tfc - regarding the Perl -> Python test port
cc @edolstra as maintainer of the previous nfs test

rnhmjoj

You have to update nixos/tests/all-tests.nix to build the nfs/ directory, instead of nfs.nix.

nixos/tests/nfs/kerberos.nix

rnhmjoj · 2019-11-23T23:01:41Z

nixos/tests/nfs/kerberos.nix

+      client.fail("echo bla >> /data/foo")
+
+      client.succeed("echo root_pw | kinit root", "echo bla >> /data/foo")
+      server.succeed("test -e /data/foo")


Maybe use wait_for_file here

test -e is what the plain NFS test uses, I assume because NFS should be synchronous here (i.e. by the time the file is visible on the client, it has been created on the server).

nixos/tests/all-tests.nix

kwohlfahrt · 2019-11-25T15:27:28Z

As noted in the issue, there are two remaining problems:

file uid/gids are all messed up. This can be fixed by running nfs-idmapd on the client, but docs suggest that this is no longer necessary as it is replaced by the nfsidmap binary. Indeed, the service is masked if services.nfs.server.enable = false. EDIT: This is nfs4 idmapd fails to operate without additional configuration (clone of #34638 for nfs4) #68106
It is not possible to write to files as root, even if the corresponding kerberos principal exists. This may be intended behavior.

nixos/tests/nfs/simple.nix

kwohlfahrt · 2019-11-25T16:28:53Z

I appear to have CI errors, but the message in details is not very clear to me: attribute 'x86_64-linux' missing, at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/eval-0-gleber.ewr1.nix.ci/nixos/release-combined.nix:50:43. How do I fix this?

kwohlfahrt · 2019-11-26T21:51:38Z

This PR has expanded in scope a bit - there is now a kernel patch to fix the hard-coded ID request-key path. This touches a few other issues, namely #68106 and #34638, though those still need a bit of module work to ensure keyutils is present for example.

tfc · 2019-11-27T07:41:36Z

nixos/tests/nfs/kerberos.nix

+      server.succeed("mkdir -p /data/alice")
+      server.succeed("chown alice:users /data/alice")
+
+      # set up kerberos database


the comments here that tell what happens on a higher level could all be subtests, so this information even appears in the log.

Oh sorry i already stated this in another comment in the same PR and didn't remember.

I've changed most of the other ones. Here, this is really set-up code that is not related to the functionality under test. Is subtest intended for this use as well?

rnhmjoj · 2019-11-27T08:39:30Z

This PR has expanded in scope a bit - there is now a kernel patch to fix the hard-coded ID request-key path. This touches a few other issues, namely #68106 and #34638, though those still need a bit of module work to ensure keyutils is present for example.

I had no idea this could get this complicated. Thanks for all the work you've done, keep it up!

rnhmjoj · 2019-11-27T09:06:26Z

I appear to have CI errors, but the message in details is not very clear to me: attribute 'x86_64-linux' missing, at /var/lib/ofborg/checkout/repo/38dca4e3aa6bca43ea96d2fcc04e8229/mr-est/eval-0-gleber.ewr1.nix.ci/nixos/release-combined.nix:50:43. How do I fix this?

I can't try right now because I don't have nearly ram to run an evaluation but you could try to rebase your branch with current master. Maybe at the point you did a checkout master itself was broken.

ofBorg runs something like this

$ nix-instantiate nixos/release-combined.nix -A tested

kwohlfahrt · 2019-11-27T11:13:47Z

I figured out the build failure - I copied the test structure from the kerberos tests, which I wrote last year. It turns out they were never enabled in release-combined.nix, because I didn't know this was a necessary step, and the way I'd been calling them doesn't work.

kwohlfahrt · 2019-11-27T15:09:16Z

All of the tests here are OK now. Remaining question are:

How should /etc/request-key.conf be generated? The issues linked above require different lines in this file.
should keyutils be part of the default systemPackages?

rnhmjoj · 2019-11-27T15:30:18Z

should keyutils be part of the default systemPackages?

If it's only needed for kerberos I would say to install it behind a guard like krb5.enable.

kwohlfahrt · 2019-11-27T15:47:14Z

@rnhmjoj - no, its needed for id-mapping in general. This is not turned on by default for sec=sys (i.e. not kerberos), but such a configuration is possible, see here. I assume this is the reason for #68106 as it doesn't mention kerberos anywhere.

It is also needed for CIFS, at least with kerberos, see #34638. I'm not familiar enough with it to know if this can also be necessary without kerberos - the man page doesn't mention it so it seems likely.

We can test for the presence of a NFS/CIFS filesystem before installing it, which seems sensible.

Mic92 · 2019-11-28T09:40:38Z

nixos/tests/nfs/kerberos.nix

+          "systemctl restart kadmind.service kdc.service",
+      )
+      for unit in ["kadmind", "kdc"]:
+          server.wait_for_unit(f"{unit}.service")


nitpick: same lines of code / easier to read:

Suggested change

server.wait_for_unit(f"{unit}.service")

server.wait_for_unit("kadmind.service")

server.wait_for_unit("kdc.service")

Nits picked. Anything left blocking merging?

Necessary for nfs server with kerberos auth

This is necessary for id mapping to work with NFS + Kerberos, and also touches NixOS#68106 and 634638.

A patch is necessary upstream to support multiple configs via symlinks in /etc/request-key.d Once that is done, we can add support for CIFS as well

Mic92 · 2019-12-13T10:21:59Z

@GrahamcOfBorg test nfs

Mic92 · 2019-12-13T10:23:08Z

@GrahamcOfBorg test nfs.simple nfs.kerberos

Mic92 · 2019-12-13T10:25:41Z

@GrahamcOfBorg test nfs3.simple nfs4.simple nfs4.kerberos

kwohlfahrt mentioned this pull request Nov 23, 2019

NFS4 server with Kerberos does not work #72722

Closed

ofborg bot added the 6.topic: nixos Issues or PRs affecting NixOS modules, or package usability issues specific to NixOS label Nov 23, 2019

rnhmjoj requested changes Nov 24, 2019

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kwohlfahrt force-pushed the nfs-tests-python branch 2 times, most recently from db4977f to 52f6a9e Compare November 24, 2019 14:44

rnhmjoj reviewed Nov 24, 2019

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nixos/tests/all-tests.nix Outdated Show resolved Hide resolved

kwohlfahrt force-pushed the nfs-tests-python branch 3 times, most recently from dd33065 to 913a10b Compare November 25, 2019 15:20

kwohlfahrt changed the title ~~[WIP] Allow Kerberized NFS~~ nixos/nfs: Allow Kerberized NFS Nov 25, 2019

kwohlfahrt marked this pull request as ready for review November 25, 2019 15:57

tfc reviewed Nov 25, 2019

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kwohlfahrt force-pushed the nfs-tests-python branch from 913a10b to 62856e8 Compare November 26, 2019 20:13

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ofborg bot requested a review from abbradar November 27, 2019 15:16

ofborg bot added 10.rebuild-darwin: 1-10 10.rebuild-linux: 501+ 10.rebuild-linux: 1001-2500 labels Nov 27, 2019

kwohlfahrt force-pushed the nfs-tests-python branch from 8f8e04d to 6ea57ed Compare November 27, 2019 21:38

kwohlfahrt requested a review from alyssais as a code owner November 27, 2019 21:38

ofborg bot removed 6.topic: python 6.topic: qt/kde 6.topic: ruby 8.has: documentation This PR adds or changes documentation 2.status: merge conflict This PR has merge conflicts with the target branch labels Nov 27, 2019

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alyssais removed their request for review November 28, 2019 09:05

Mic92 reviewed Nov 28, 2019

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kwohlfahrt added 3 commits December 12, 2019 12:23

nixos/nfs: convert test to python

59a0e58

nfs-utils: build svcgssd

7b83883

Necessary for nfs server with kerberos auth

linux: patch request-key binary path

ea55a2d

This is necessary for id mapping to work with NFS + Kerberos, and also touches NixOS#68106 and 634638.

kwohlfahrt force-pushed the nfs-tests-python branch from 6ea57ed to d17c834 Compare December 12, 2019 15:34

kwohlfahrt added 3 commits December 12, 2019 15:42

nixos/nfs: test nfs with kerberos authentication

0dce66a

nfs: set up request-key for id mapping

b1c10bc

A patch is necessary upstream to support multiple configs via symlinks in /etc/request-key.d Once that is done, we can add support for CIFS as well

keyutils: patch to allow symlinks in config dir

e0b9b5f

kwohlfahrt force-pushed the nfs-tests-python branch from d17c834 to e0b9b5f Compare December 12, 2019 15:42

nfs-utils: link nfs tests

e71bd33

Mic92 merged commit 1c329c9 into NixOS:staging Dec 13, 2019

tfc mentioned this pull request Dec 13, 2019

nixos/tests: Leftover tasks towards unified Python integration tests #72828

Closed

kwohlfahrt mentioned this pull request Dec 14, 2019

nfs4 idmapd fails to operate without additional configuration (clone of #34638 for nfs4) #68106

Closed

tbenst mentioned this pull request Dec 17, 2019

cifs-utils mount.cifs fails if using kerberos auth #34638

Open

kwohlfahrt deleted the nfs-tests-python branch December 18, 2019 10:42

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nixos/nfs: Allow Kerberized NFS #73989

nixos/nfs: Allow Kerberized NFS #73989

kwohlfahrt commented Nov 23, 2019 •

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Mic92 commented Dec 13, 2019

Mic92 commented Dec 13, 2019

Mic92 commented Dec 13, 2019

	server.wait_for_unit(f"{unit}.service")
	server.wait_for_unit("kadmind.service")
	server.wait_for_unit("kdc.service")

nixos/nfs: Allow Kerberized NFS #73989

nixos/nfs: Allow Kerberized NFS #73989

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kwohlfahrt commented Nov 23, 2019 • edited Loading

Motivation for this change

Things done

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