[ANNOUNCE] Samba 4.0 beta2

Andrew Bartlett abartlet at samba.org
Wed Jun 20 06:33:42 MDT 2012

We are proud to a announce another beta release of Samba 4.0, beta 2

What's new in Samba 4 beta2

Samba 4.0 will be the next version of the Samba suite and incorporates
all the technology found in both the Samba4 alpha series and the
stable 3.x series. The primary additional features over Samba 3.6 are
support for the Active Directory logon protocols used by Windows 2000
and above.


Samba4 beta2 is not a final Samba release, however we are now making
good progress towards a Samba 4.0 release, of which this is a preview.
Be aware the this release contains the best of all of Samba's
technology parts, both a file server (that you can reasonably expect
to upgrade existing Samba 3.x releases to) and the AD domain
controller work previously known as 'samba4'.

Samba4 is subjected to an awesome battery of tests on an automated
basis, we have found Samba 4.0 to be very stable in it's behavior.
However, we still recommend against upgrading production servers from
Samba 3.x release to Samba 4.0 beta at this stage.

In particular note that the new default configuration 's3fs' may have
different stability characteristics compared with our previous default
file server.  We are making this release so that we can find and fix
any of these issues that arise in the real world.  New AD DC
installations can provision or join with --use-ntvfs to obtain the
previous default file server.  See below how to continue using ntvfs
in an existing installation.

If you are upgrading, or looking to develop, test or deploy Samba 4.0
beta releases, you should backup all configuration and data.


Users upgrading from Samba 3.x domain controllers and wanting to use
Samba 4.0 as an AD DC should use the 'samba-tool domain
classicupgrade' command.  See the wiki for more details:

Users upgrading from Samba 4.0 alpha and beta releases since alpha15 
should run 'samba-tool dbcheck --cross-ncs --fix'.  Users upgrading
from earlier alpha releases should contact the team for advice. 


Samba 4.0 beta supports the server-side of the Active Directory logon
environment used by Windows 2000 and later, so we can do full domain
join and domain logon operations with these clients.

Our Domain Controller (DC) implementation includes our own built-in
LDAP server and Kerberos Key Distribution Center (KDC) as well as the
Samba3-like logon services provided over CIFS.  We correctly generate
the infamous Kerberos PAC, and include it with the Kerberos tickets we

Samba 4.0 beta ships with two distinct file servers.  We now use the
file server from the Samba 3.x series 'smbd' for all file serving by
default.  For pure file server work, the binaries users would expect
from that series (nmbd, winbindd, smbpasswd) continue to be available.

Samba 4.0 also ships with the 'NTVFS' file server.  This file server
is what was used in all previous alpha releases of Samba 4.0, and is
tuned to match the requirements of an AD domain controller.  We
continue to support this, not only to provide continuity to
installations that have deployed it as part of an AD DC, but also as a
running example of the NT-FSA architecture we expect to move smbd to in
the longer term.  

As mentioned above, this change to the default file server may cause
instability, as we learn about the real-world interactions between
these two key components. 

As DNS is an integral part of Active Directory, we also provide a DNS
solution, using the BIND DLZ mechanism in versions 9.8 and 9.9.
During the provision, a configuration file will be generated for bind
to make it use this plugin.  We also have a project to provide a
minimal internal DNS server from within the Samba process, for easier
'out of the box' configuration.  Note however that this is not yet
complete (pending addition of secure DNS update support).

To provide accurate timestamps to Windows clients, we integrate with
the NTP project to provide secured NTP replies. 

Finally, a new scripting interface has been added to Samba 4, allowing
Python programs to interface to Samba's internals, and many tools and
internal workings of the DC code is now implemented in python.


For a list of changes since beta1, please see the git log.

$ git clone git://git.samba.org/samba.git
$ cd samba.git
$ git log samba-4.0.0beta1..samba-4.0.0beta2

Some major user-visible changes include:

The default file server for EXISTING USERS has changed to s3fs.  To
continue to use ntvfs, you must set in your smb.conf:

    server services = +smb -s3fs
    dcerpc endpoint servers = +winreg +srvsvc

samba-tool dbcheck will now upgrade older databases that are missing
GUIDs in the schema partition.  

The 'samba-tool domain samba3upgrade' command is now called
'samba-tool domain classicupgrade' and now creates users and groups
with the posixAccount objectClass and uidNumber and gidNumber values.

The new 'idmap_ldb:use rfc2307' parameter allows these values to be
used instead of the idmap.ldb, where found in the directory.

Work has continued to make Samba more portable to a wide variety of
Unix-like systems, and to support --without-ad-dc on systems lacking a
modern MIT krb5.

Less visible, but very importantly, the work has continued in restructuring
the smbd file server to implement SMB3.

The TDB2 database library has been changed to ntdb, but will not be
the default db layer for the 4.0 release.  We will continue to use tdb1.


- This release makes the s3fs file server the default, as this is the
  file server combination we will use for the Samba 4.0 release.
  Users should still expect some rough edges: in particular, there are
  warnings about invalid parameters from the two respective parameter
  parsing engines.

- Replication of DNS data from one AD server to another may not work.
  The DNS data used by the internal DNS server and bind9_dlz is stored
  in an application partition in our directory.  The replicaton of
  this partition is not yet reliable.

- Replication may fail on FreeBSD due to getaddrinfo() rejecting names
  containing _.  A workaround will be in the next beta.

- upgradeprovision should not be run when upgrading to this release
  from a recent release.  No important database format changes have
  been made since alpha16.  

- Installation on systems without a system iconv (and developer
  headers at compile time) is known to cause errors when dealing with
  non-ASCII characters.

- Domain member support in the 'samba' binary is in it's infancy, and
  is not comparable to the support found in winbindd.  As such, do not
  use the 'samba' binary (provided for the AD server) on a member

- There is no NetBIOS browsing support (network neighbourhood) in the
  'samba' binary (use nmbd and smbd instead)

- Clock Synchronisation is critical.  Many 'wrong password' errors are
  actually due to Kerberos objecting to a clock skew between client
  and server.  (The NTP work in the previous alphas are partly to assist
  with this problem).

- The DRS replication code may fail.  Please contact the team if you
  experience issues with DRS replication, as we have fixed many issues
  here in response to feedback from our production users. 

RUNNING Samba 4.0 as an AD DC

A short guide to setting up Samba 4 as an AD DC can be found on the wiki:


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 4.0 product in the project's Bugzilla
database (https://bugzilla.samba.org/).

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

Download Details

The release tarball is available from the following location:
 * http://download.samba.org/samba/ftp/samba4/samba-4.0.0beta2.tar.gz

This release has been signed using GPG with Andrew's GPG key 28B436BB).

 * http://download.samba.org/samba/ftp/samba4/samba-4.0.0beta2.tar.asc

To verify that the signature is correct, make sure that the tarball has
been unzipped and run:

$ gpg --verify samba-4.0.0beta2.tar.asc

Happy testing!

The Samba team
Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org

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