[Bug 1416906] Re: force user no longer works

[Brian Murray]

I've uploaded this to the Trusty proposed queue for review by the SRU
team.

** Changed in: samba (Ubuntu)
       Status: In Progress => Fix Released

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Title:
  force user no longer works

Status in samba package in Ubuntu:
  Fix Released
Status in samba source package in Trusty:
  In Progress

Bug description:
  [Impact]
  * Users are no longer able to use the force user or force group options in the smb.conf.  This can prevent users from accessing shares without first having to login with a valid login.

  [Test Case]
  1. Create a directory /tmp/ubuntu
  2. chown ubuntu:ubuntu /tmp/ubuntu
  3. Add a section to the smb.conf like so.
  [Ubuntutest]
  comment = Ubuntutest
  path = /tmp/ubuntu
  browseable = yes
  read only = no
  guest ok = yes
  force user = ubuntu
  4. Make sure the ubuntu user has access to the directory from the server.
  5. Attempt to access the share
  6. Create a file
  7. Verify the file is owned by ubuntu.

  *Note: this does not seem to be testable from the samba-client command
  line tool as it succeeds both before and after the patch.

  [Regression Potential]
  * Minimal.  The fix is to use vuser->session_info instead of conn->session_info, when checking permissions.  This seems like it should be fairly isolated to the initial permissions checks.

  [Other Info]
  * Pretty straightforward cherry-pick of upstream solution.

  ______________________________________________________
  There is nasty regression bug in samba 4.1.6
  That prevents the use of the "force user" option.

  https://bugzilla.samba.org/show_bug.cgi?id=9878

  It has been fixed in 4.1.7.

  For now I installed samba from:  ppa:linux-schools/backports
  In order to get things working again.

  Gérald

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