Defaults for xenial (samba 4.3.11):
client min protocol = CORE
client max protocol = default (which is NT1 in this version of samba)
Defaults for artful (samba 4.6.7):
client min protocol = CORE
client max protocol = default (which is NT1 in this version of samba)
Defaults for bionic (samba 4.7.6):
client min protocol = CORE
client max protocol = default (which is SMB3_11 in this version of samba)
So before bionic, if you wanted a more secure protocol, you had to
specify it (like smbclient's -m SMB3 option).
Now in bionic, if you want a *less* secure protocol. you have to specify
it.
Ideally, computer browsing and actually connecting to shares should
happen with different protocol versions.
smbclient in bionic does a quick downgrade to NT1 when needed. Notice the
"Reconnecting" message intertwined in the output below:
ubuntu@bionic-desktop:~$ smbclient -L xenial -N -m SMB3
Anonymous login successful
Sharename Type Comment
--------- ---- -------
print$ Disk Printer Drivers
public Disk Public share
IPC$ IPC IPC Service (xenial-desktop server (Samba,
Ubuntu))
Reconnecting with SMB1 for workgroup listing.
Anonymous login successful
Server Comment
--------- -------
Workgroup Master
--------- -------
UBUNTU XENIAL
In artful, that downgrade does not happen, and we don't get the workgroup
listing:
ubuntu@artful-desktop:~$ smbclient -L xenial -N -m SMB3
Anonymous login successful
Sharename Type Comment
--------- ---- -------
print$ Disk Printer Drivers
public Disk Public share
IPC$ IPC IPC Service (xenial-desktop server (Samba,
Ubuntu))
Anonymous login successful
Server Comment
--------- -------
Workgroup Master
--------- -------
ubuntu@artful-desktop:~$
I suspect smbtree does the same. In bionic, where max protocol is SMB3_11 by
default, it works out of the box. But in artful, if I set client max protocol
to SMB3_11, it stops working:
ubuntu@artful-desktop:~$ testparm -s -v 2>/dev/null|grep "client max protocol"
client max protocol = default
ubuntu@artful-desktop:~$ smbtree
UBUNTU
\\XENIAL xenial-desktop server (Samba, Ubuntu)
\\XENIAL\IPC$ IPC Service (xenial-desktop
server (Samba, Ubuntu))
\\XENIAL\public Public share
\\XENIAL\print$ Printer Drivers
\\BIONIC bionic-desktop server (Samba, Ubuntu)
\\BIONIC\IPC$ IPC Service (bionic-desktop
server (Samba, Ubuntu))
\\BIONIC\public Public share
\\BIONIC\print$ Printer Drivers
\\ARTFUL artful-desktop server (Samba, Ubuntu)
\\ARTFUL\IPC$ IPC Service (artful-desktop
server (Samba, Ubuntu))
\\ARTFUL\public Public share
\\ARTFUL\print$ Printer Drivers
ubuntu@artful-desktop:~$ sudo vi /etc/samba/smb.conf
ubuntu@artful-desktop:~$ testparm -s -v 2>/dev/null|grep "client max protocol"
client max protocol = SMB3
ubuntu@artful-desktop:~$ smbtree
ubuntu@artful-desktop:~$
So in summay, bionic samba's own tools seem to know when NT1 is needed and
downgrade appropriately. Ideally the rest of the smb ecosystem should do the
same, assuming there is no way to get the computer listing with non-NT1
protocols.
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https://bugs.launchpad.net/bugs/1767454
Title:
"Other Locations" does not automatically find Samba servers in Ubuntu
18.04
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https://bugs.launchpad.net/gvfs/+bug/1767454/+subscriptions
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