[Announce] Samba 4.9.0rc3 Available for Download

Karolin Seeger kseeger at samba.org
Wed Aug 15 10:02:35 UTC 2018

Release Announcements

This is the third release candidate of Samba 4.9.  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 4.9 will be the next version of the Samba suite.



net ads setspn

There is a new 'net ads setspn' sub command for managing Windows SPN(s)
on the AD. This command aims to give the basic functionality that is
provided on windows by 'setspn.exe' e.g. ability to add, delete and list
Windows SPN(s) stored in a Windows AD Computer object.

The format of the command is:

net ads setspn list [machine]
net ads setspn [add | delete ] SPN [machine]

'machine' is the name of the computer account on the AD that is to be managed.
If 'machine' is not specified the name of the 'client' running the command
is used instead.

The format of a Windows SPN is
  'serviceclass/host:port/servicename' (servicename and port are optional)

serviceclass/host is generally sufficient to specify a host based service.

net ads keytab changes
net ads keytab add no longer attempts to convert the passed serviceclass
(e.g. nfs, html etc.) into a Windows SPN which is added to the Windows AD
computer object. By default just the keytab file is modified.

A new keytab subcommand 'add_update_ads' has been added to preserve the
legacy behaviour. However the new 'net ads setspn add' subcommand should
really be used instead.

net ads keytab create no longer tries to generate SPN(s) from existing
entries in a keytab file. If it is required to add Windows SPN(s) then
'net ads setspn add' should be used instead.

Local authorization plugin for MIT Kerberos

This plugin controls the relationship between Kerberos principals and AD
accounts through winbind. The module receives the Kerberos principal and the
local account name as inputs and can then check if they match. This can resolve
issues with canonicalized names returned by Kerberos within AD. If the user
tries to log in as 'alice', but the samAccountName is set to ALICE (uppercase),
Kerberos would return ALICE as the username. Kerberos would not be able to map
'alice' to 'ALICE' in this case and auth would fail.  With this plugin account
names can be correctly mapped. This only applies to GSSAPI authentication,
not for the getting the initial ticket granting ticket.

VFS audit modules

The vfs_full_audit module has changed it's default set of monitored successful
and failed operations from "all" to "none". That helps to prevent potential
denial of service caused by simple addition of the module to the VFS objects.

Also, modules vfs_audit, vfs_ext_audit and vfs_full_audit now accept any valid
syslog(3) facility, in accordance with the manual page.

Database audit support

Changes to the Samba AD's sam.ldb database are now logged to Samba's debug log
under the "dsdb_audit" debug class and "dsdb_json_audit" for JSON formatted log

Transaction commits and roll backs are now logged to Samba's debug logs under
the "dsdb_transaction_audit" debug class and "dsdb_transaction_json_audit" for
JSON formatted log entries.

Password change audit support

Password changes in the AD DC are now logged to Samba's debug logs under the
"dsdb_password_audit" debug class and "dsdb_password_json_audit" for JSON
formatted log entries.

Group membership change audit support

Group membership changes on the AD DC are now logged to
Samba's debug log under the "dsdb_group_audit" debug class and
"dsdb_group_json_audit" for JSON formatted log entries.

Log Authentication duration

For NTLM and Kerberos KDC authentication, the authentication duration is now
logged. Note that the duration is only included in the JSON formatted log

JSON library Jansson required for the AD DC

By default the Jansson JSON library is required for Samba to build.
It is strictly required for the Samba AD DC, and is optional for
builds --without-ad-dc by specifying --without-json-audit at configure

New Experimental LMDB LDB backend

A new experimental LDB backend using LMDB is now available. This allows
databases larger than 4Gb (Currently the limit is set to 6Gb, but this will be
increased in a future release). To enable lmdb, provision or join a domain using
the --backend-store=mdb option.

This requires that a version of lmdb greater than 0.9.16 is installed and that
samba has not been built with the --without-ldb-lmdb option.

Please note this is an experimental feature and is not recommended for
production deployments.

Password Settings Objects
Support has been added for Password Settings Objects (PSOs). This AD feature is
also known as Fine-Grained Password Policies (FGPP).

PSOs allow AD administrators to override the domain password policy settings
for specific users, or groups of users. For example, PSOs can force certain
users to have longer password lengths, or relax the complexity constraints for
other users, and so on. PSOs can be applied to groups or to individual users.
When multiple PSOs apply to the same user, essentially the PSO with the best
precedence takes effect.

PSOs can be configured and applied to users/groups using the 'samba-tool domain
passwordsettings pso' set of commands.

Domain backup and restore
A new samba-tool command has been added that allows administrators to create a
backup-file of their domain DB. In the event of a catastrophic failure of the
domain, this backup-file can be used to restore Samba services.

The new 'samba-tool domain backup online' command takes a snapshot of the
domain DB from a given DC. In the event of a catastrophic DB failure, all DCs
in the domain should be taken offline, and the backup-file can then be used to
recreate a fresh new DC, using the 'samba-tool domain backup restore' command.
Once the backed-up domain DB has been restored on the new DC, other DCs can
then subsequently be joined to the new DC, in order to repopulate the Samba

Domain rename tool
Basic support has been added for renaming a Samba domain. The rename feature is
designed for the following cases:
1). Running a temporary alternate domain, in the event of a catastrophic
failure of the regular domain. Using a completely different domain name and
realm means that the original domain and the renamed domain can both run at the
same time, without interfering with each other. This is an advantage over
creating a regular 'online' backup - it means the renamed/alternate domain can
provide core Samba network services, while trouble-shooting the fault on the
original domain can be done in parallel.
2). Creating a realistic lab domain or pre-production domain for testing.

Note that the renamed tool is currently not intended to support a long-term
rename of the production domain. Currently renaming the GPOs is not supported
and would need to be done manually.

The domain rename is done in two steps: first, the 'samba-tool domain backup
rename' command will clone the domain DB, renaming it in the process, and
producing a backup-file. Then, the 'samba-tool domain backup restore' command
takes the backup-file and restores the renamed DB to disk on a fresh DC.

New samba-tool options for diagnosing DRS replication issues

The 'samba-tool drs showrepl' command has two new options controlling
the output. With --summary, the command says very little when DRS
replication is working well. With --json, JSON is produced. These
options are intended for human and machine audiences, respectively.

The 'samba-tool visualize uptodateness' visualizes replication lag as
a heat-map matrix based on the DRS uptodateness vectors. This will
show you if (but not why) changes are failing to replicate to some DCs.

Automatic site coverage and GetDCName improvements

Samba's AD DC now automatically claims otherwise empty sites based on
which DC is the nearest in the replication topology.

This, combined with efforts to correctly identify the client side in
the GetDCName Netlogon call will improve service to sites without a
local DC.

Improved samba-tool computer command

The 'samba-tool computer' command allow manipulation of computer
accounts including creating a new computer and resetting the password.
This allows an 'offline join' of a member server or workstation to the
Samba AD domain.

Samba performance tool now operates against Microsoft Windows AD

The Samba AD performance testing tool traffic_reply can now operate
against a Windows based AD domain.  Previously it only operated
correctly against Samba.

DNS entries are now cleaned up during DC demote

DNS records are now cleaned up as part of the 'samba-tool domain
demote' including both the default and --remove-other-dead-server

Additionally DNS records can be automatically cleaned up for a given
name with the 'samba-tool dns cleanup' command, which aids in cleaning
up partially removed DCs.

samba-tool ntacl sysvolreset is now much faster

The 'samba-tool ntacl sysvolreset' command, used on the Samba AD DC,
is now much faster than in previous versions, after an internal

Samba now tested with CI GitLab

Samba developers now have pre-commit testing available in GitLab,
giving reviewers confidence that the submitted patches pass a full CI
before being submitted to the Samba Team's own autobuild system.

Dynamic DNS record scavenging support

It is now possible to enable scavenging of DNS Zones to remove DNS
records that were dynamically created and have not been touched in
some time.

This support should however only be enabled on new zones or new
installations.  Sadly old Samba versions suffer from BUG 12451 and
mark dynamic DNS records as static and static records as dynamic.
While a dbcheck rule may be able to find these in the future,
currently a reliable test has not been devised.

Finally, there is not currently a command-line tool to enable this
feature, currently it should be enabled from the DNS Manager tool from
Windows. Also the feature needs to have been enabled by setting the smb.conf
parameter "dns zone scavenging = yes".

CTDB changes

There are many changes to CTDB in this release.

* Configuration has been completely overhauled

  - Daemon and tool options are now specified in a new ctdb.conf
    Samba-style configuration file.  See ctdb.conf(5) for details.

  - Event script configuration is no longer specified in the top-level
    configuration file.  It can now be specified per event script.
    For example, configuration options for the 50.samba event script
    can be placed alongside the event script in a file called
    50.samba.options.  Script options can also be specified in a new
    script.options file.  See ctdb-script.options(5) for details.

  - Options that affect CTDB startup should be configured in the
    distribution-specific configuration file.  See ctdb.sysconfig(5)
    for details.

  - Tunable settings are now loaded from ctdb.tunables.  Using
    CTDB_SET_TunableVariable=<value> in the main configuration file is
    no longer supported.  See ctdb-tunables(7) for details.

  A example script to migrate an old-style configuration to the new
  style is available in ctdb/doc/examples/config_migrate.sh.

* The following configuration variables and corresponding ctdbd
  command-line options have been removed and not replaced with
  counterparts in the new configuration scheme:

    CTDB_PIDFILE                     --pidfile
    CTDB_SOCKET			     --socket
    CTDB_NODES			     --nlist
    CTDB_PUBLIC_ADDRESSES	     --public-addresses
    CTDB_EVENT_SCRIPT_DIR	     --event-script-dir
    CTDB_NOTIFY_SCRIPT		     --notification-script
    CTDB_PUBLIC_INTERFACE	     --public-interface
    CTDB_MAX_PERSISTENT_CHECK_ERRORS --max-persistent-check-errors

  - The compile-time defaults should be used for the first 6 of these.
  - Use a symbolic link from the configuration directory to specify a
    different location for nodes or public_addresses (e.g. in the
    cluster filesystem).
  - Executable notification scripts in the notify.d/ subdirectory of
    the configuration directory are now run by unconditionally.
  - Interfaces for public IP addresses must always be specified in the
    public_addresses file using the currently supported format.

  Some related items that have been removed are:

  - The ctdb command's --socket command-line option
  - The ctdb command's CTDB_NODES environment variable

  When writing tests there are still mechanisms available to change
  the locations of certain directories and files.

* Event scripts have moved to the scripts/legacy subdirectory of the
  configuration directory

  Event scripts must now end with a ".script" suffix.

* The "ctdb event" command has changed in 2 ways:

  - A component is now required for all commands

    In this release the only valid component is "legacy".

  - There is no longer a default event when running "ctdb event status"

    Listing the status of the "monitor" event is now done via:

      ctdb event status legacy monitor

   See ctdb(1) for details.

* The following service-related event script options have been




  Event scripts for services are now disabled by default.  To enable
  an event script and, therefore, manage a service use a command like
  the following:

    ctdb event script enable legacy 50.samba

* Notification scripts have moved to the scripts/notification
  subdirectory of the configuration directory

  Notification scripts must now end with a ".script" suffix.

* Support for setting CTDB_DBDIR=tmpfs has been removed

  This feature has not been implemented in the new configuration
  system.  If this is desired then a tmpfs filesystem should be
  manually mounted on the directory pointed to by the "volatile
  database directory" option.  See ctdb.conf(5) for more details.

* Support for the NoIPHostOnAllDisabled tunable has been removed

  If all nodes are unhealthy or disabled then CTDB will not host
  public IP addresses.  That is, CTDB now behaves as if
  NoIPHostOnAllDisabled were set to 1.

* The onnode command's CTDB_NODES_FILE environment variable has been

  The -f option can still be used to specify an alternate node file.

* The 10.external event script has been removed

* The CTDB_SHUTDOWN_TIMEOUT configuration variable has been removed

  As with other daemons, if ctdbd does not shut down when requested
  then manual intervention is required.  There is no safe way of
  automatically killing ctdbd after a failed shutdown.

  variable have been removed

  These should be setup in the systemd unit/system file or, for SYSV
  init, in the distribution-specific configuration file for the ctdb

* CTDB_PARTIALLY_ONLINE_INTERFACES incompatibility no longer enforced

  11.natgw and 91.lvs will no longer fail if
  CTDB_PARTIALLY_ONLINE_INTERFACES=yes.  The incompatibility is,
  however, well documented.  This option will be removed in future and
  replaced by sensible behaviour where public IP addresses simply
  switch interfaces or become unavailable when interfaces are down.

* Configuration file /etc/ctdb/sysconfig/ctdb is no longer supported

GPO Improvements

The samba_gpoupdate command (used in applying Group Policies to the
samba machine itself) has been renamed to samba_gpupdate and had the
syntax changed to better match the same tool on Windows.


smb.conf changes

As the most popular Samba install platforms (Linux and FreeBSD) both
support extended attributes by default, the parameters "map readonly",
"store dos attributes" and "ea support" have had their defaults changed
to allow better Windows fileserver compatibility in a default install.

  Parameter Name                     Description             Default
  --------------                     -----------             -------
  map readonly                       Default changed              no
  store dos attributes               Default changed             yes
  ea support                         Default changed             yes
  full_audit:success                 Default changed            none
  full_audit:failure                 Default changed            none

VFS interface changes

The VFS ABI interface version has changed to 39. Function changes

SMB_VFS_FSYNC: Removed: Only async versions are used.
SMB_VFS_READ: Removed: Only PREAD or async versions are used.
SMB_VFS_WRITE: Removed: Only PWRITE or async versions are used.
SMB_VFS_CHMOD_ACL: Removed: Only CHMOD is used.
SMB_VFS_FCHMOD_ACL: Removed: Only FCHMOD is used.

Any external VFS modules will need to be updated to match these
changes in order to work with 4.9.x.


o  Jeremy Allison <jra at samba.org>
   * BUG 13453: CVE-2018-10858: libsmb: Harden smbc_readdir_internal() against
     returns from malicious servers.

o  Andrew Bartlett <abartlet at samba.org>
   * BUG 13374: CVE-2018-1140: ldbsearch '(distinguishedName=abc)' and DNS query
     with escapes crashes, ldb: Release LDB 1.3.5 for CVE-2018-1140
   * BUG 13552: CVE-2018-10918: cracknames: Fix DoS (NULL pointer de-ref) when
     not servicePrincipalName is set on a user.

o  Tim Beale <timbeale at catalyst.net.nz>
   * BUG 13434: CVE-2018-10919: acl_read: Fix unauthorized attribute access via

o  Samuel Cabrero <scabrero at suse.de>
   * BUG 13540: ctdb_mutex_ceph_rados_helper: Set SIGINT signal handler.

o  G√ľnther Deschner <gd at samba.org>
   * BUG 13360: CVE-2018-1139 libcli/auth: Do not allow ntlmv1 over SMB1 when it
     is disabled via "ntlm auth".
   * BUG 13529: s3-tldap: do not install test_tldap.

o  David Disseldorp <ddiss at samba.org>
   * BUG 13540: ctdb_mutex_ceph_rados_helper: Fix deadlock via lock renewals.

o  Andrej Gessel <Andrej.Gessel at janztec.com>
   * BUG 13374: CVE-2018-1140 Add NULL check for ldb_dn_get_casefold() in

o  Amitay Isaacs <amitay at gmail.com>
   * BUG 13554: ctdb-eventd: Fix CID 1438155.

o  Volker Lendecke <vl at samba.org>
   * BUG 13553: Fix CIDs 1438243, (Unchecked return value) 1438244
     (Unsigned compared against 0), 1438245 (Dereference before null check) and
     1438246 (Unchecked return value).
   * BUG 13554: ctdb: Fix a cut&paste error.

o  Oleksandr Natalenko <oleksandr at redhat.com>
   * BUG 13559: systemd: Only start smb when network interfaces are up.

o  Noel Power <noel.power at suse.com>
   * BUG 13553: Fix quotas don't work with SMB2.
   * BUG 13563: s3/smbd: Ensure quota code is only called when quota support

o  Anoop C S <anoopcs at redhat.com>
   * BUG 13204: s3/libsmb: Explicitly set delete_on_close token for rmdir.

o  Andreas Schneider <asn at samba.org>
   * BUG 13561: s3:waf: Install eventlogadm to /usr/sbin.

o  Justin Stephenson <jstephen at redhat.com>
   * BUG 13562: Shorten description in vfs_linux_xfs_sgid manual.


o  Jeremy Allison <jra at samba.org>
   * BUG 13537: s3: smbd:  Using "sendfile = yes" with SMB2 can cause CPU spin.

o  Ralph Boehme <slow at samba.org>
   * BUG 13535: s3: smbd: Fix path check in

o  Alexander Bokovoy <ab at samba.org>
   * BUG 13538: samba-tool trust: Support discovery via netr_GetDcName.
   * BUG 13542: s4-dsdb: Only build dsdb Python modules for AD DC.

o  Amitay Isaacs <amitay at gmail.com>
   * BUG 13520: Fix portability issues on freebsd.

o  Gary Lockyer <gary at catalyst.net.nz>
   * BUG 13536: DNS wildcard search does not handle multiple labels correctly.

o  Stefan Metzmacher <metze at samba.org>
   * BUG 13308: samba-tool domain trust: Fix trust compatibility to Windows
     Server 1709 and FreeIPA.

o  Martin Schwenke <martin at meltin.net>
   * BUG 13520: Fix portability issues on freebsd.
   * BUG 13545: ctdb-protocol: Fix CTDB compilation issues.
   * BUG 13546: ctdb-docs: Replace obsolete reference to CTDB_DEBUG_HUNG_SCRIPT
   * BUG 13550: ctdb-doc: Provide an example script for migrating old
   * BUG 13551: ctdb-event: Implement event tool "script list" command.



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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