[Bug 1702529] Re: ACCESS_DENIED with symlinks within a root ("/") share

[Brian Murray]

Hello Dave, or anyone else affected,

Accepted samba into xenial-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-
0ubuntu0.16.04.10 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, details of your
testing will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

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

** Tags added: verification-needed-xenial

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https://bugs.launchpad.net/bugs/1702529

Title:
   ACCESS_DENIED with symlinks within a root ("/") share

Status in samba:
  Unknown
Status in samba package in Ubuntu:
  Fix Released
Status in samba source package in Trusty:
  Fix Committed
Status in samba source package in Xenial:
  Fix Committed
Status in samba source package in Zesty:
  Fix Committed

Bug description:
  [Impact]

   * In case of accessing directories chdir to it directly instead of
  its parent directory. This changes how dir symlinks are handled in
  root shares and leads to avoiding the ACCESS_DENIED ISSUE.

  [Test Case]

   1. Prepare smb server with a share:
  [rootshare]
     guest ok = yes
     path = /
     wide links = no
     follow symlinks = yes
   2. On the server:
  mkdir -p /srv/dir
  ln -s /srv/dir /srv/symdir.
   3. Connect from a client:
  smbclient -m smb3 //server/rootshare -c "cd srv\symdir; dir"

  [Regression Potential]

   * When accessing broken symlinks share's base directory is accessed.
  This however seems to be consistent with a pre-fix behavior.

  [Other Info]

  This fix is included in Samba 4.6.7 release so Artful and Debian both
  have it already.

  Original bug description:

  See Samba bug: https://bugzilla.samba.org/show_bug.cgi?id=12873 for
  more information and test case. Also view LP bug:
  https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1701073 for more
  information.

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