[Bug 1977745] [NEW] nfs-utils/nfs-kernel-server (rpc.svcgssd) ignored /etc/nfs.conf settings

[Marcel]

Public bug reported:

Tested on:
 Ubuntu 22.04 (x86_64)
 Package: nfs-kernel-server 1:2.6.1-1ubuntu1

Set config options in /etc/nfs.conf are ignored by rpc.svcgssd (required
for krb5 NFSv4).

I was trying to set the principal name like:

[svcgssd]
principal=nfs/myhost.mydomain.de at MYDOMAIN.DE

but rpc.svcgssd refused to start. When specified on command line (using
the -p option) things started working.

After having a look at the code (nfs-utils-2.6.1/utils/gssd/svcgssd.c),
the problem seems to be

        /* We don't need the config anymore */
        conf_cleanup();

which is called too early. So at the point where gssd_acquire_cred() is
called the variable "principal" does no longer contain the data read
from the config file.

Moving conf_cleanup() to the end of the code helps.

I also tried to get into contact with the nfs-utils developer themselves
- but I hope someone at Ubuntu has a better way to contact them.

** Affects: nfs-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: nfs-kernel-server nfs-utils nfs.conf

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https://bugs.launchpad.net/bugs/1977745

Title:
  nfs-utils/nfs-kernel-server (rpc.svcgssd) ignored /etc/nfs.conf
  settings

Status in nfs-utils package in Ubuntu:
  New

Bug description:
  Tested on:
   Ubuntu 22.04 (x86_64)
   Package: nfs-kernel-server 1:2.6.1-1ubuntu1

  Set config options in /etc/nfs.conf are ignored by rpc.svcgssd
  (required for krb5 NFSv4).

  I was trying to set the principal name like:

  [svcgssd]
  principal=nfs/myhost.mydomain.de at MYDOMAIN.DE

  but rpc.svcgssd refused to start. When specified on command line
  (using the -p option) things started working.

  After having a look at the code (nfs-
  utils-2.6.1/utils/gssd/svcgssd.c), the problem seems to be

          /* We don't need the config anymore */
          conf_cleanup();

  which is called too early. So at the point where gssd_acquire_cred()
  is called the variable "principal" does no longer contain the data
  read from the config file.

  Moving conf_cleanup() to the end of the code helps.

  I also tried to get into contact with the nfs-utils developer
  themselves - but I hope someone at Ubuntu has a better way to contact
  them.

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