[Bug 1719889] Re: internal-use-only SIDs being mapped to GIDs on users

[ Christian Ehrhardt ]

Hi,
it seems there were similar issues discussed in bug 1307778
They got resolved groupds with no GID in AD, but still ended up having the issue around S-1-18-1 that you reported.

Looking back how the other issue was fixed I really think you should try
to recreate the issue on the latest version in Ubunutu (e.g. 4.7.6+dfsg
~ubuntu-0ubuntu2 in Ubuntu Cosmic or even newer but not yet released
4.8.2 from https://launchpad.net/~ahasenack/+archive/ubuntu/samba-
merge-4.8-1778125).

This most unlikely is a bug in Ubuntu, but in the upstream code.
Therefore if reproducible there report it upstream in https://bugzilla.samba.org/enter_bug.cgi and report back here the bug id so we can track and include the fix.

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https://bugs.launchpad.net/bugs/1719889

Title:
  internal-use-only SIDs being mapped to GIDs on users

Status in samba package in Ubuntu:
  New

Bug description:
  Ubuntu server 16.04, samba/winbind package version 4.3.11+dfsg-
  0ubuntu0.16.04.11

  When logging in via SSH as a domain user the error "groups: cannot
  find name for group ID 2005" is displayed.  running "id $username"
  also shows this 2005 group with no name.

  "wbinfo -G 2005" returns "S-1-18-1", no other lookups for 2005 or
  S-1-18-1 return anything.

  MS documentation lists S-1-18-1 as
  AUTHENTICATION_AUTHORITY_ASSERTED_IDENTITY, which should not be
  exposed in the manner that it is here.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: winbind 2:4.3.11+dfsg-0ubuntu0.16.04.11
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  Date: Wed Sep 27 08:25:47 2017
  NmbdLog:
   
  OtherFailedConnect: Yes
  ProcEnviron:
   TERM=xterm-256color
   SHELL=/bin/bash
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   XDG_RUNTIME_DIR=<set>
  SambaServerRegression: No
  SmbConfIncluded: Yes
  SmbLog:
   
  SourcePackage: samba
  UpgradeStatus: Upgraded to xenial on 2016-05-09 (505 days ago)

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