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

[Dariusz Gadomski]

** Description changed:

+ [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 -d 5 -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]
+  
+ 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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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:
  In Progress

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 -d 5 -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]
   
  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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