[ANNOUNCE] Samba 4.0 beta7
abartlet at samba.org
Mon Aug 27 18:25:39 MDT 2012
We are proud to announce another beta release of Samba 4.0, beta7
What's new in Samba 4.0 beta7
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
Samba 4.0 beta7 is not a final Samba release, however we are now making
good progress towards a Samba 4.0 release. However, this is expected to be the
last beta release before we start on our release candidate series.
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'.
Samba 4.0 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 behaviour.
However, as with all our pre-releases we still recommend against
upgrading production servers from Samba 3.x release to Samba 4.0 beta
at this stage.
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' before re-starting
Samba. Users upgrading from earlier alpha releases should contact the
team for advice.
Users upgrading an AD DC from any previous release should run
'samba-tool ntacl sysvolreset' to re-sync ACLs on the sysvol share
with those matching the GPOs in LDAP and the defaults from an initial
provision. This will set an underlying POSIX ACL if required (eg not
using the NTVFS file server).
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
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.
For pure file server work, the binaries users would expect from that
series (nmbd, winbindd, smbpasswd) continue to be available. When
running an AD DC, you only need to run 'samba' (not
nmbd/smbd/winbind), as the required services are co-ordinated by this
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. To use you need to
start ntpd and configure it with the 'restrict ... ms-sntp' and
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.
CHANGES SINCE beta6
For a list of changes since beta6, please see the git log.
$ git clone git://git.samba.org/samba.git
$ cd samba.git
$ git log samba-4.0.0beta6..samba-4.0.0beta7
Some major user-visible changes include:
- ACLs are now set during provision at the POSIX layer for the sysvol
share. This allows group policies to be modified by Domain
Administrators (Policy Administrators) that are not the actual
- A number of verified fixes for expanding memory use across the AD
domain controller, including in the Bind9 DLZ module.
- A fix for bug #9097 (the winbind in the AD DC would lock up under
- wbinfo --ping-dc now returns helpful information on what failed and
against which DC it failed
- SMB3 encryption support
- New 'samba-tool ntacl' commands:
- samba-tool ntacl sysvolreset
- samba-tool ntacl sysvolcheck
Less visible, but important changes under the hood include:
- Continued work to support SMB2 and SMB3
- Continued work to use async IO to improve file server performance.
- Patches to ensure that talloc_tos() and talloc_stackframe() are
always used correctly.
- We can now test the implementation of NT -> POSIX ACL mapping in a
unit test with VFS bindings exposing both to python. We also store
the posix ACL in a tdb during make test, allowing testing of this
feature on all platforms, regardless of local FS settings.
- Python bindings for the source3 async libsmb library (for use in testing)
- 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.
- For similar reasons, sites with ACLs stored by the ntvfs file server
may wish to continue to use that file server implementation, as a
posix ACL will similarly not be set in this case.
- 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 replication of
this partition is not yet reliable.
- Replication may fail on FreeBSD due to getaddrinfo() rejecting names
containing _. A workaround will be in a future 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
- 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)
available for the AD domain controller. (Support in nmbd and smbd
for classic domains and member/standalone servers is unchanged).
- 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
== Our Code, Our Bugs, Our Responsibility.
== The Samba Team
The release tarball is available from the following location:
This release has been signed using GPG with Andrew's GPG key 28B436BB).
To verify that the signature is correct, make sure that the tarball has
been unzipped and run:
$ gpg --verify samba-4.0.0beta7.tar.asc
The Samba team
Andrew Bartlett http://samba.org/~abartlet/
Authentication Developer, Samba Team http://samba.org
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