libsmbclient and SMB3

[Jeremy Allison]

On Tue, Aug 28, 2018 at 11:27:11AM +0200, Andreas Schneider wrote:
> 
> Ok, I see smbclient reconnects using SMB1 for listing the shares. However it 
> produces an error:
> 
> bin/smbclient -L //earth.milkyway.site -UAdministrator%Secret007!                                  
> 
>         Sharename       Type      Comment
>         ---------       ----      -------
>         ADMIN$          Disk      Remote Admin
>         C$              Disk      Default share
>         IPC$            IPC       Remote IPC
>         NETLOGON        Disk      Logon server share
>         SYSVOL          Disk      Logon server share
> Reconnecting with SMB1 for workgroup listing.
> Connection to earth.milkyway.site failed (Error 
> NT_STATUS_RESOURCE_NAME_NOT_FOUND)
> Failed to connect with SMB1 -- no workgroup available
> 
> libsmbclient doesn't do the reconnect and fails.
> 
> 
> How do you do share listing if SMB1 has been completely disabled, use  
> dcerpc_srvsvc_NetShareEnumAll()?
> 
> 
> The reason is that I get a lot of bugs which complain about listing shares is 
> broken with Nautilus (which uses a gvfs libsmbclient backend).

Inside libsmbclient it uses:

                                if (net_share_enum_rpc(
                                            srv->cli,
                                            list_fn,
                                            (void *) dir) < 0 &&
                                    cli_RNetShareEnum(
                                            srv->cli,
                                            list_fn,
                                            (void *)dir) < 0) {

where net_share_enum_rpc() calls dcerpc_srvsvc_NetShareEnumAll(),
so we try the DCE call first, then fall back to the old SMB1 RAP
call if that fails.