[Samba] wide links and privileges

[L.P.H. van Belle]

Hai, 

I use the following on one of my member servers. 

Put set these three in your global smb.conf. 

enable privileges = Yes
unix extensions = No
allow insecure wide links = Yes


And on the share i have set. 
   wide links = yes
   follow symlinks = yes

and this is working for years for me. 

Try these and report back. 
If its not working tell us you OS and samba version


Greetz, 

Louis



> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Emmanuel Garette
> Verzonden: woensdag 6 januari 2016 11:09
> Aan: samba at lists.samba.org
> Onderwerp: Re: [Samba] wide links and privileges
> 
> Le 04/01/2016 09:11, L.P.H. van Belle a écrit :
> > From :  man smb.conf
> >
> > Which explains it self.
> >
> >        enable privileges (G)
> > [..]
> 
> Hi,
> 
> Thank you for your answer, would you mind if I ask for some more help ?
> I'm sorry I don't understand exactly why you told me to look at the
> `enable privileges` parameter in the man pages as an answer.
> I have already  closely read the documentation and even had a glance at
> the samba's source code, and there is absolutely no mention of a
> possible conflict between the `enable privileges` parameter and the
> `wide links` parameter. Let me show you something in the samba's source
> code:
> 
> The function which interests us here deals with the file names, there is
> an `if` statement:
> 
> source3/smbd/filename.c:
> ```
>  * @param smbreq    SMB request if we're using privileges.
> [...]
>     if (!smbreq) {
>         status = check_name(conn, (*pp_smb_fname)->base_name);
>     } else {
>         status = check_name_with_privilege(conn, smbreq,
> (*pp_smb_fname)->base_name);
>     }
> ```
> 
> which redirects us to the `check_name` or the
> `check_name_with_privilege` function.
> which themselves respectively redirects to the `check_reduced_name` and
> `check_reduced_name_with_privilege` functions:
> 
> source3/smbd/vfs.c:
> ```
> NTSTATUS check_reduced_name(connection_struct *conn, const char *fname)
> [...]
>     /* Common widelinks and symlinks checks. */
>     if (!allow_widelinks || !allow_symlinks) {
> [...]
>         if (strncmp(conn_rootdir, resolved_name,
>                 rootdir_len) != 0) {
>             DEBUG(2, ("check_reduced_name: Bad access "
>                 "attempt: %s is a symlink outside the "
>                 "share path\n", fname));
> 
> ```
> and
> 
> ```
> NTSTATUS check_reduced_name_with_privilege(connection_struct *conn,
>             const char *fname,
>             struct smb_request *smbreq)
> [...]
>         if (strncmp(conn_rootdir, resolved_name, rootdir_len) != 0) {
>             DEBUG(2, ("check_reduced_name_with_privilege: Bad access "
>                 "attempt: %s is a symlink outside the "
>                 "share path\n",
>                 dir_name));
> ```
> 
> We can see that in the first function there is a test on the
> `allow_widelinks` local variable, whereas this test doesn't exist in the
> second function.
> Which seems to mean that in the first case it works, whereas in the
> second case **it doesn't work**...
> 
> Anyway, my question is: are you guys really positive on the fact that it
> is supposed to work fine if the `enable privileges` parameter is set to
> `yes`?
> Thank you in advance.
> Cheers,
> 
> --
> Emmanuel Garette
> Ingénieur logiciels libres
> 
> Cadoles (http://www.cadoles.com)
> Experts EOLE, Gaspacho, logiciels libres
> 
> 
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