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

[Dariusz Gadomski]

I have verified the following version of samba this morning:
- Trusty: 4.3.11+dfsg-0ubuntu0.14.04.11
- Xenial: 4.3.11+dfsg-0ubuntu0.16.04.10
- Zesty: 4.5.8+dfsg-0ubuntu0.17.04.6

I run it in a testing environment that was originally used to reproduce
this issue. On all 3 the issue is gone.

** Tags removed: verification-needed verification-needed-trusty verification-needed-xenial verification-needed-zesty
** Tags added: verification-done verification-done-trusty verification-done-xenial verification-done-zesty

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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.

   * One autopkgtest failure has been found, nothing related to samba so
  another bug has been reported (LP: #1713098) against gvfs DEP8 test.

  For more details: 
     - https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1702529/comments/18

  [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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