[Announce] Samba 4.8.0rc3 Available for Download

Karolin Seeger kseeger at samba.org
Mon Feb 12 10:48:55 UTC 2018

Release Announcements

This is the third release candidate of Samba 4.8.  This is *not*
intended for production environments and is designed for testing
purposes only.  Please report any defects via the Samba bug reporting
system at https://bugzilla.samba.org/.

Samba 4.8 will be the next version of the Samba suite.



KDC GPO application

Adds Group Policy support for the Samba kdc. Applies password policies
(minimum/maximum password age, minimum password length, and password
complexity) and kerberos policies (user/service ticket lifetime and
renew lifetime).

Adds the samba_gpoupdate script for applying and unapplying
policy. Can be applied automatically by setting

 'apply group policies = yes'.

Time Machine Support with vfs_fruit

Samba can be configured as a Time Machine target for Apple Mac devices
through the vfs_fruit module. When enabling a share for Time Machine
support the relevant Avahi records to support discovery will be published
for installations that have been built against the Avahi client library.

Shares can be designated as a Time Machine share with the following setting:

  'fruit:time machine = yes'

Support for lower casing the MDNS Name

Allows the server name that is advertised through MDNS to be set to the
hostname rather than the Samba NETBIOS name. This allows an administrator
to make Samba registered MDNS records match the case of the hostname
rather than being in all capitals.

This can be set with the following settings:

  'mdns name = mdns'

Encrypted secrets

Attributes deemed to be sensitive are now encrypted on disk. The sensitive
values are currently:

This encryption is enabled by default on a new provision or join, it
can be disabled at provision or join time with the new option

However, an in-place upgrade will not encrypt the database.

Once encrypted, it is not possible to do an in-place downgrade (eg to
4.7) of the database. To obtain an unencrypted copy of the database a
new DC join should be performed, specifying the '--plaintext-secrets'

The key file "encrypted_secrets.key" is created in the same directory
as the database and should NEVER be disclosed.  It is included by the
samba_backup script.

Active Directory replication visualisation

To work out what is happening in a replication graph, it is sometimes
helpful to use visualisations. We introduce a samba-tool subcommand to
write Graphviz dot output and generate text-based heatmaps of the
distance in hops between DCs.

There are two subcommands, two graphical modes, and (roughly) two modes of
operation with respect to the location of authority.

`samba-tool visualize ntdsconn` looks at NTDS Connections.
`samba-tool visualize reps` looks at repsTo and repsFrom objects.

In '--distance' mode (default), the distances between DCs are shown in
a matrix in the terminal. With '--color=yes', this is depicted as a
heatmap. With '--utf8' it is a lttle prettier.

In '--dot' mode, Graphviz dot output is generated. When viewed using
dot or xdot, this shows the network as a graph with DCs as vertices
and connections edges. Certain types of degenerate edges are shown in
different colours or line-styles.

NT4-style replication based net commands removed

The following commands and sub-commands have been removed from the
"net" utility:

net rpc samdump
net rpc vampire ldif

Also, replicating from a real NT4 domain with "net rpc vampire" and
"net rpc vampire keytab" has been removed.

The NT4-based commands were accidentially broken in 2013, and nobody
noticed the breakage. So instead of fixing them including tests (which
would have meant writing a server for the protocols, which we don't
have) we decided to remove them.

For the same reason, the "samsync", "samdeltas" and "database_redo"
commands have been removed from rpcclient.

"net rpc vampire keytab" from Active Directory domains continues to be

vfs_aio_linux module removed

The current Linux kernel aio does not match what Samba would
do. Shipping code that uses it leads people to false
assumptions. Samba implements async I/O based on threads by default,
there is no special module required to see benefits of read and write
request being sent do the disk in parallel.

smbclient reparse point symlink parameters reversed

A bug in smbclient caused the 'symlink' command to reverse the
meaning of the new name and link target parameters when creating a
reparse point symlink against a Windows server. As this is a
little used feature the ordering of these parameters has been
reversed to match the parameter ordering of the UNIX extensions
'symlink' command. The usage message for this command has also
been improved to remove confusion.

Winbind changes

The dependency to global list of trusted domains within
the winbindd processes has been reduced a lot.

The construction of that global list is not reliable and often
incomplete in complex trust setups. In most situations the list is not needed
any more for winbindd to operate correctly. E.g. for plain file serving via SMB
using a simple idmap setup with autorid, tdb or ad. However some more complex
setups require the list, e.g. if you specify idmap backends for specific
domains. Some pam_winbind setups may also require the global list.

If you have a setup that doesn't require the global list, you should set
"winbind scan trusted domains = no".

VirusFilter VFS module

This new module integrates with Sophos, F-Secure and ClamAV anti-virus
software to provide scanning and filtering of files on a Samba share.


The two commands 'net serverid list' and 'net serverid wipe' have been
removed, because the file serverid.tdb is not used anymore.

'net serverid list' can be replaced by listing all files in the
subdirectory "msg.lock" of Samba's "lock directory". The unique id
listed by 'net serverid list' is stored in every process' lockfile in

'net serverid wipe' is not necessary anymore. It was meant primarily
for clustered environments, where the serverid.tdb file was not
properly cleaned up after single node crashes. Nowadays smbd and
winbind take care of cleaning up the msg.lock and msg.sock directories

smb.conf changes

  Parameter Name                     Description             Default
  --------------                     -----------             -------
  apply group policies               New                     no
  auth methods                       Removed
  binddns dir                        New
  client schannel                    Default changed/        yes
  gpo update command                 New
  ldap ssl ads                       Deprecated
  map untrusted to domain            Removed
  oplock contention limit            Removed
  prefork children                   New                     1
  mdns name                          New                   netbios
  fruit:time machine                 New                   false
  profile acls                       Removed
  use spnego                         Removed
  server schannel                    Default changed/        yes
  unicode                            Deprecated
  winbind scan trusted domains       New                     yes
  winbind trusted domains only       Removed


o  Trever L. Adams <trever.adams at gmail.com>
   * BUG 13246: Backport Samba VirusFilter.

o  Ralph Boehme <slow at samba.org>
   * BUG 13228: dbcheck: Add support for restoring missing forward links.

o  Günther Deschner <gd at samba.org>
   * BUG 13221: python: fix the build with python3.

o  Stefan Metzmacher <metze at samba.org>
   * BUG 13228: dbcheck: Add support for restoring missing forward links.


o  Günther Deschner <gd at samba.org>
   * BUG 13227: packaging: Fix default systemd-dir path.
   * BUG 13238: build: Deal with recent glibc sunrpc header removal.

o  Stefan Metzmacher <metze at samba.org>
   * BUG 13228: repl_meta_data: fix linked attribute corruption on databases
     with unsorted links on expunge.

o  Christof Schmitt <cs at samba.org>
   * BUG 13217: s3/smbd: Remove file system sharemode before calling unlink.

o  Andreas Schneider <asn at samba.org>
   * BUG 13209: Small improvements in winbindd for the resource cleanup in error
   * BUG 13238: Make Samba work with tirpc and libnsl2.



Reporting bugs & Development Discussion

Please discuss this release on the samba-technical mailing list or by
joining the #samba-technical IRC channel on irc.freenode.net.

If you do report problems then please try to send high quality
feedback. If you don't provide vital information to help us track down
the problem then you will probably be ignored.  All bug reports should
be filed under the Samba 4.1 and newer product in the project's Bugzilla
database (https://bugzilla.samba.org/).

== Our Code, Our Bugs, Our Responsibility.
== The Samba Team

Download Details

The uncompressed tarballs and patch files have been signed
using GnuPG (ID 6F33915B6568B7EA).  The source code can be downloaded


The release notes are available online at:


Our Code, Our Bugs, Our Responsibility.

                        The Samba Team
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