[Bug 1037055] Re: winbind does not refresh kerberos tickets

[Robie Basak]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. I appreciate the quality of this bug report and I'm sure
it'll be helpful to others experiencing the same issue.

This sounds like an upstream bug to me. Please can you verify this by
building directly from the latest upstream source? If this can be
confirmed as an upstream bug, the best route to getting it fixed in
Ubuntu in this case would be to file an upstream bug if you're able to
do that. Otherwise, I'm not sure what we can do directly in Ubuntu to
fix the problem.

If you do end up filing an upstream bug, please link to it from here.
Thanks!

** Changed in: samba (Ubuntu)
   Importance: Undecided => Critical

** Changed in: samba (Ubuntu)
   Importance: Critical => Medium

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Title:
  winbind does not refresh kerberos tickets

Status in “samba” package in Ubuntu:
  New

Bug description:
  winbindd will renew kerberos tickets until they expire, but it seems
  unable to refresh them before expiry.

  I have the following in smb.conf:

  winbind refresh ticket = true

  and have cached_login set for pam_winbind

  After 7 days ( the renewal limit on AD kerberos tickets) the ticket
  expires and I lose access to my NFS home directory which uses sec=krb5

  I have tried to debug why this is happening and have come to the
  conclusion that there are two important variables for ticket
  refreshing to work (both in winbind/winbindd_cred_cache.c):

  ccache_list
  memory_creds_list

  and that the function that stores the password for later refreshing
  use is called

  winbindd_add_memory_creds

  This function though requires that the user is in ccache_list before
  it stores the password in a way it can be used by the rekinit part of
  the function krb5_ticket_refresh_handler.

  The problem as I see it is that winbind forks and the parent populates ccache_list and the child populates memory_creds_list.
  This leads to the password not being stored in a way that can be used by the rekinit code in krb5_ticket_refresh_handler.

  As a dirty hack (attached) I tried populating memory_creds_list from
  the same location as ccache_list get populated
  (winbindd_raw_kerberos_login in winbind/winbindd_pam.c).

  This hack "fixes" the problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: winbind 2:3.6.3-2ubuntu2.3
  ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
  Uname: Linux 3.2.0-27-generic x86_64
  ApportVersion: 2.0.1-0ubuntu12
  Architecture: amd64
  Date: Wed Aug 15 11:30:27 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SambaClientRegression: No
  SourcePackage: samba
  UpgradeStatus: No upgrade log present (probably fresh install)
  mtime.conffile..etc.default.winbind: 2012-07-06T14:00:57
  mtime.conffile..etc.init.d.winbind: 2012-07-06T14:00:57

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