Samba 4.9.0 Available for Download

Samba 4.9.0 (gzipped)

                   Release Notes for Samba 4.9.0
                        September 13, 2018

This is the first stable release of the Samba 4.9 release series.
Please read the release notes carefully before upgrading.


'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 getting the initial ticket granting ticket.

VFS audit modules

The vfs_full_audit module has changed its 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' subcommand 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.

New 'samba-tool ou' command

The new 'samba-tool ou' command allows to manage organizational units.

Available subcommands are:
  create       - Create an organizational unit.
  delete       - Delete an organizational unit.
  list         - List all organizational units
  listobjects  - List all objects in an organizational unit.
  move         - Move an organizational unit.
  rename       - Rename an organizational unit.

In addition to the ou commands, there are new subcommands for the user
and group management, which can make use of the organizational units:
  group move   - Move a group to an organizational unit/container.
  user move    - Move a user to an organizational unit/container.
  user show    - Display a user AD object.

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".

Improved support for trusted domains (as AD DC)

The support for trusted domains/forests has been further improved.

External domain trusts, as well a transitive forest trusts,
are supported in both directions (inbound and outbound)
for Kerberos and NTLM authentication.

The following features are new in 4.9 (compared to 4.8):

- It's now possible to add users/groups of a trusted domain
  into domain groups. The group memberships are expanded
  on trust boundaries.
- foreignSecurityPrincipal objects (FPO) are now automatically
  created when members (as SID) of a trusted domain/forest
  are added to a group.
- The 'samba-tool group *members' commands allow
  members to be specified as foreign SIDs.

However there are currently still a few limitations:

- Both sides of the trust need to fully trust each other!
- No SID filtering rules are applied at all!
- This means DCs of domain A can grant domain admin rights
  in domain B.
- Selective (CROSS_ORGANIZATION) authentication is
  not supported. It's possible to create such a trust,
  but the KDC and winbindd ignore them.
- Samba can still only operate in a forest with just
  one single domain.

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/

* 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.

* The following ctdbd.conf and ctdbd options have been replaced by new
  ctdb.conf options:

    CTDB_LOGGING/--logging                     logging  -> location
    CTDB_DEBUGLEVEL/-d                         logging  -> log level
    CTDB_TRANSPORT/--transport                 cluster  -> transport
    CTDB_NODE_ADDRESS/--listen                 cluster  -> node address
    CTDB_RECOVERY_LOCK/--reclock               cluster  -> recovery lock
    CTDB_DBDIR/--dbdir                         database -> volatile database directory
    CTDB_DBDIR_PERSISTENT/--dbdir-persistent   database -> peristent database directory
    CTDB_DBDIR_STATE/--dbdir-state             database -> state database directory
    CTDB_DEBUG_LOCKS                           database -> lock debug script
    CTDB_DEBUG_HUNG_SCRIPT                     event    -> debug script
    CTDB_NOSETSCHED/--nosetsched               legacy   -> realtime scheduling
    CTDB_CAPABILITY_RECMASTER/--no-recmaster   legacy   -> recmaster capability
    CTDB_CAPABILITY_LMASTER/--no-lmaster       legacy   -> lmaster capability
    CTDB_START_AS_STOPPED/--start-as-stopped   legacy   -> start as stopped
    CTDB_START_AS_DISABLED/--start-as-disabled legacy   -> start as disabled
    CTDB_SCRIPT_LOG_LEVEL/--script-log-level   legacy   -> script log level

* 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.

* The following tunable options are now ctdb.conf options:

    DisabledIPFailover    failover -> disabled
    TDBMutexEnabled       database -> tdb mutexes

* 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  Björn Baumbach <>
   * BUG 13605: samba_dnsupdate: Honor 'dns zone scavenging' option, only
     update if needed.

o  Andreas Schneider <>
   * BUG 13606: wafsamba: Fix 'make -j<jobs>'.

o  Jeremy Allison <>
   * BUG 13565: s3: VFS: vfs_full_audit: Ensure smb_fname_str_do_log() only
     returns absolute pathnames.

o  Paulo Alcantara <>
   * BUG 13578: s3: util: Do not take over stderr when there is no log file.

o  Ralph Boehme <>
   * BUG 13549: Durable Reconnect fails because cookie.allow_reconnect is not

o  Alexander Bokovoy <>
   * BUG 13539: krb5-samba: Interdomain trust uses different salt principal.

o  Volker Lendecke <>
   * BUG 13441: vfs_fruit: Don't unlink the main file.
   * BUG 13602: smbd: Fix a memleak in async search ask sharemode.

o  Stefan Metzmacher <>
   * BUG 11517: Fix Samba GPO issue when Trust is enabled.
   * BUG 13539: samba-tool: Add "virtualKerberosSalt" attribute to
     'user getpassword/syncpasswords'.

o  Martin Schwenke <>
   * BUG 13589: Fix CTDB configuration issues.
   * BUG 13592: ctdbd logs an error until it can successfully connect to


o  Jeremy Allison <>
   * BUG 13585: s3: smbd: Ensure get_real_filename() copes with empty

o  Tim Beale <>
   * BUG 13566: samba domain backup online/rename commands force user to specify
     password on CLI.

o  Alexander Bokovoy <>
   * BUG 13579: wafsamba/samba_abi: Always hide ABI symbols which must be

o  Volker Lendecke <>
   * BUG 13584: Fix a panic if fruit_access_check detects a locking conflict.

o  Andreas Schneider <>
   * BUG 13567: Fix memory and resource leaks.
   * BUG 13580: python: Fix print in

o  Martin Schwenke <>
   * BUG 13588: Aliasing issue causes incorrect IPv6 checksum.
   * BUG 13589: Fix CTDB configuration issues.

o  Ralph Wuerthner <>
   * BUG 13568: s3: vfs: time_audit: fix handling of token_blob in


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

o  Andrew Bartlett <>
   * 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 <>
   * BUG 13434: CVE-2018-10919: acl_read: Fix unauthorized attribute access via

o  Samuel Cabrero <>
   * BUG 13540: ctdb_mutex_ceph_rados_helper: Set SIGINT signal handler.

o  Günther Deschner <>
   * 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 <>
   * BUG 13540: ctdb_mutex_ceph_rados_helper: Fix deadlock via lock renewals.

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

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

o  Volker Lendecke <>
   * 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 <>
   * BUG 13559: systemd: Only start smb when network interfaces are up.

o  Noel Power <>
   * 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 <>
   * BUG 13204: s3/libsmb: Explicitly set delete_on_close token for rmdir.

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

o  Justin Stephenson <>
   * BUG 13562: Shorten description in vfs_linux_xfs_sgid manual.


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

o  Ralph Boehme <>
   * BUG 13535: s3: smbd: Fix path check in

o  Alexander Bokovoy <>
   * 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 <>
   * BUG 13520: Fix portability issues on freebsd.

o  Gary Lockyer <>
   * BUG 13536: DNS wildcard search does not handle multiple labels correctly.

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

o  Martin Schwenke <>
   * 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.