[PATCH] Services: Check and modify gdm-password in pam-limits

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2 participants
  • Danny Milosavljevic
  • Jesse Gibbons
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Jesse Gibbons
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Jesse Gibbons wrote on 15 Sep 2019 01:10
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(name . guix-patches mailing list)(address . guix-patches@gnu.org)
73e46631970b385218a1b067e545bd8e7ef21ddf.camel@gmail.com
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Fixes bug #37380
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From 6a0ced2a9ce956071290ea8bba2a74f8c9c8e5f5 Mon Sep 17 00:00:00 2001
From: Jesse Gibbons <jgibbons2357+guix@gmail.com>
Date: Sat, 14 Sep 2019 16:35:39 -0600
Subject: [PATCH] Services: Check and modify gdm-password in pam-limits-service

---
gnu/services/base.scm | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Toggle diff (15 lines)
diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 25716ef152..6ab7b110ec 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -1478,7 +1478,7 @@ information on the configuration file syntax."
(module "pam_limits.so")
(arguments '("conf=/etc/security/limits.conf")))))
(if (member (pam-service-name pam)
- '("login" "su" "slim"))
+ '("login" "su" "slim" "gdm-password"))
(pam-service
(inherit pam)
(session (cons pam-limits
--
2.23.0
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Jesse Gibbons wrote on 25 Sep 2019 17:47
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(address . 37405@debbugs.gnu.org)
461364c376c0c54f0bfff80ed7727d182400671f.camel@gmail.com
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On Wed, 2019-09-18 at 20:46 -0600, Jesse Gibbons wrote:
Toggle quote (2 lines)
> ping
> https://lists.gnu.org/archive/html/guix-patches/2019-09/msg00357.html
ping
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Danny Milosavljevic wrote on 2 Oct 2019 01:00
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(name . Jesse Gibbons)(address . jgibbons2357@gmail.com)(address . 37405@debbugs.gnu.org)
20191002010032.1f01e2b0@scratchpost.org
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Hi,

thanks for the patch.

I'm not thrilled about that approach (arguably Guix already does it wrong
anyway).

But since the manual of pam_limits does describe that one should use it
like that, I have applied it as a stop-gap fix to guix master as
commit 0bf7d34d77ffca40be9e04586195054e9f2c7a13.

Long term, we should really make pam entries first class and show up in the
operating-system record--that's what they are FOR: to let the administrator
(and thus the organization) choose how they want to do user
authorization/session handling etc. Why do we decide for them?

Bug report kept open for obvious reasons.
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Jesse Gibbons wrote on 2 Oct 2019 16:53
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(name . Danny Milosavljevic)(address . dannym@scratchpost.org)(address . 37405@debbugs.gnu.org)
b8ac867abc140429d1e41e1174084edb893c30d1.camel@gmail.com
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On Wed, 2019-10-02 at 01:00 +0200, Danny Milosavljevic wrote:
Toggle quote (6 lines)
> Hi,
>
> thanks for the patch.
>
> I'm not thrilled about that approach (arguably Guix already does it wrong
> anyway).
I think you should start a thread on the guix-devel list expressing your
concerns, and we can discuss how to improve guix from there.
Toggle quote (4 lines)
>
> But since the manual of pam_limits does describe that one should use it
> like that, I have applied it as a stop-gap fix to guix master as
> commit 0bf7d34d77ffca40be9e04586195054e9f2c7a13.
Thanks!
Toggle quote (7 lines)
>
> Long term, we should really make pam entries first class and show up in
> the
> operating-system record--that's what they are FOR: to let the
> administrator
> (and thus the organization) choose how they want to do user
> authorization/session handling etc.
If PAM configurations should be up to the administrator, there should be
documentation to teach the administrator how to use them. The manual doesn't
say anything about how to use pam-services in operating-system, so I
submitted a bug report (bug #37583) requesting documentation.

Toggle quote (1 lines)
> Why do we decide for them?
I think I agree with your point that if a non-default configuration is
desired, administrators should be able to modify it, just like any other
part of the configuration. Ideally they can always opt-out of details they
don't want.

I do not agree that we are deciding for the admins. This is just like the
discussion about whether GuixSD should include the /usr/bin/env and /bin/sh
special files by default, except there isn't any documentation on how to
opt out of or extend the default PAM services.

There must be a default for every detail. If a detail is found practical
most of the time, I think it is good to either have it as a default (like
/usr/bin/sh) or have a ready example of how to implement it viewable from
the install environment (like what we do with desktop environments) so most
users don't have to look up how to add it. That does not negate the ability
of power users and administrators to opt out in the operating-system
configuration.

In the context of this patch, pam-limits is still opt-in. Perhaps a more
flexible fix would be to make the pam-limits-service-type accept an optional
list of strings identifying the configurations to create or modify to use
pam-limits, with the default being %default-pam-limits-service-names
defined as '("login" "su") which could then be appended to %slim-pam-
service-names '("slim") or %gdm-pam-service-names '("gdm-password" ...). If
you or anyone else wants to implement that proposal and update the
documentation so admins will know how to configure it, feel free.

I hope I did not misunderstand your comments. We can discuss this and your
other concerns in a guix-devel thread.
--
-Jesse
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