Samba 4.10 Features added/changed

Revision as of 17:34, 24 February 2019 by Fraz (talk | contribs) (Samba 4.10.0rc3)

Samba 4.10.0rc3

Release Notes for Samba 4.10.0rc3
February 22, 2019

Release Announcements

This is the third release candidate of Samba 4.10. 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

Samba 4.10 will be the next version of the Samba suite.



GPO Improvements

A new 'samba-tool gpo export' command has been added that can export a set of Group Policy Objects from a domain in a generalised XML format.

A corresponding 'samba-tool gpo restore' command has been added to rebuild the Group Policy Objects from the XML after generalization. (The administrator needs to correct the values of XML entities between the backup and restore to account for the change in domain).

KDC prefork

The KDC now supports the pre-fork process model and worker processes will be forked for the KDC when the pre-fork process model is selected for samba.

Prefork 'prefork children'

The default value for this smdb.conf parameter has been increased from 1 to 4.

Netlogon prefork

DCERPC now supports pre-forked NETLOGON processes. The netlogon processes are pre-forked when the prefork process model is selected for samba.

Offline domain backups

The 'samba-tool domain backup' command has been extended with a new 'offline' option. This safely creates a backup of the local DC's database directly from disk. The main benefits of an offline backup are it's quicker, it stores more database details (for forensic purposes), and the samba process does not have to be running when the backup is made. Refer to the samba-tool help for more details on using this command.

Group membership statistics

A new 'samba-tool group stats' command has been added. This provides summary information about how the users are spread across groups in your domain. The 'samba-tool group list --verbose' command has also been updated to include the number of users in each group.

Prefork process restart

The pre-fork process model now restarts failed processes. The delay between restart attempts is controlled by the "prefork backoff increment" (default = 10) and "prefork maximum backoff" (default = 120) smbd.conf parameters. A linear back off strategy is used with "prefork backoff increment" added to the delay between restart attempts up until it reaches "prefork maximum backoff".

Using the default sequence the restart delays (in seconds) are:

0, 10, 20, ..., 120, 120, ...

Standard process model

When using the standard process model samba forks a new process to handle ldap and netlogon connections. Samba now honours the 'max smbd processes' smb.conf parameter. The default value of 0, indicates there is no limit. The limit is applied individually to netlogon and ldap. When the process limit is exceeded Samba drops new connections immediately.

python3 support

This is the first release of Samba which has full support for Python 3. Samba 4.10 still has support for Python 2, however, Python 3 will be used by default, i.e. 'configure' & 'make' will execute using python3.

To build Samba with python2 you *must* set the 'PYTHON' environment variable for both the 'configure' and 'make' steps, i.e.

  'PYTHON=python2 ./configure'
  'PYTHON=python2 make'

This will override the python3 default.

Alternatively, it is possible to produce Samba Python bindings for both Python 2 and Python 3. To do so, specify '--extra-python=/usr/bin/python2' as part of the 'configure' command. Note that python3 will still be used as the default in this case.

Note:Samba 4.10 supports Python 3.4 onwards.

Future Python support

Samba 4.10 will be the last release that comes with full support for Python 2. Unfortunately, the Samba Team doesn't have the resources to support both Python 2 and Python 3 long-term.

Samba 4.11 will not have any runtime support for Python 2. This means if you use Python 2 bindings it is time to migrate to Python 3 now.

If you are building Samba using the '--disable-python' option (i.e. you're excluding all the run-time Python support), then this will continue to work on a system that supports either python2 or python3.

Note:Samba 4.11 will most likely only support Python 3.6 onwards.

JSON logging

Authentication messages now contain the Windows Event Id "eventId" and logon type "logonType". The supported event codes and logon types are:

Event codes:
4624 Successful logon
4625 Unsuccessful logon
Logon Types:
2 Interactive
3 Network
8 NetworkCleartext

The version number for Authentication messages is now 1.1, changed from 1.0

Password change messages now contain the Windows Event Id "eventId", the supported event Id's are:

4723 Password changed
4724 Password reset

The version number for PasswordChange messages is now 1.1, changed from 1.0

Group membership change messages now contain the Windows Event Id "eventId", the supported event Id's are:

4728 A member was added to a security enabled global group
4729 A member was removed from a security enabled global group
4732 A member was added to a security enabled local group
4733 A member was removed from a security enabled local group
4746 A member was added to a security disabled local group
4747 A member was removed from a security disabled local group
4751 A member was added to a security disabled global group
4752 A member was removed from a security disabled global group
4756 A member was added to a security enabled universal group
4757 A member was removed from a security enabled universal group
4761 A member was added to a security disabled universal group
4762 A member was removed from a security disabled universal group

The version number for GroupChange messages is now 1.1, changed from 1.0. Also A GroupChange message is generated when a new user is created to log that the user has been added to their primary group.

The leading "JSON <message type>:" and source file prefix of the JSON formatted log entries has been removed to make the parsing of the JSON log messages easier. JSON log entries now start with 2 spaces followed by an opening brace i.e. " {"

SMBv2 samba-tool support

On previous releases, some samba-tool commands would not work against a remote DC that had SMBv1 disabled. SMBv2 support has now been added for samba-tool. The affected commands are 'samba-tool domain backup|rename' and the 'samba-tool gpo' set of commands. Refer also BUG #13676.


MIT Kerberos build of the AD DC

While not removed, the MIT Kerberos build of the Samba AD DC is still considered experimental. Because Samba will not issue security patches for this configuration, such builds now require the explicit configure option: --with-experimental-mit-ad-dc

For further details see Running_a_Samba_AD_DC_with_MIT_Kerberos_KDC


The samba_backup script has been removed. This has now been replaced by the 'samba-tool domain backup offline' command.

SMB client Python bindings

The SMB client python bindings are now deprecated and will be removed in future Samba releases. This will only affects users that may have used the Samba Python bindings to write their own utilities, i.e. users with a custom Python script that includes the line 'from samba import smb'.

smb.conf changes

 Parameter Name                     Description                Default
 --------------                     -----------                -------
 prefork backoff increment   Delay added to process restart    10 (seconds)
                             between attempts.
 prefork maximum backoff     Maximum delay for process between 120 (seconds)
                             process restart attempts
 smbd search ask sharemode   Name changed, old name was
                             "smbd:search ask sharemode"
 smbd async dosmode          Name changed, old name was
                             "smbd:async dosmode"
 smbd max async dosmode      Name changed, old name was
                             "smbd:max async dosmode"
 smbd getinfo ask sharemode  New: similar to "smbd search ask  yes
                             sharemode" but for SMB getinfo


  • Jeremy Allison <>
  • BUG #13690: smbd: uid: Don't crash if 'force group' is added to an existing share connection.
  • BUG #1377013770: s3: VFS: vfs_fruit. Fix the NetAtalk deny mode compatibility code.
  • Andrew Bartlett <>
  • ldb: Release ldb 1.5.3
  • BUG #13762: Avoid inefficient one-level searches.
  • BUG #13772: The test should not rely on order of entries in dict.
  • Tim Beale <>
  • BUG #13762: ldb: Avoid inefficient one-level searches.
  • Ralph Boehme <>
  • Günther Deschner <>
  • BUG #13746: s3-smbd: Use fruit:model string for mDNS registration.
  • David Disseldorp <>
  • BUG #13766: printing: Check lp_load_printers() prior to pcap cache update.
  • Christof Schmitt <>
  • Andreas Schneider <>
  • BUG #13770: s3:vfs: Correctly check if OFD locks should be enabled or not.
  • BUG #13778: Public ZERO_STRUCT() uses undefined C11 function memset_s().


  • Jeremy Allison <>
  • BUG #13750: libcli: dns: Change internal DNS_REQUEST_TIMEOUT from 2 to 10 seconds.
  • Tim Beale <>
  • BUG #13676: samba-tool SMB/sysvol connections do not work if SMBv1 is disabled.
  • BUG #13747: join: Throw CommandError instead of Exception for simple errors.
  • Günther Deschner <>
  • BUG #13774: s3-vfs: Add glusterfs_fuse vfs module.
  • Volker Lendecke <>
  • BUG #13742: ctdb: Print locks latency in machinereadable stats.
  • Stefan Metzmacher <>
  • BUG #13752: s4:server: Add support for 'smbcontrol samba shutdown'.
  • Anoop C S <>
  • BUG #13330: vfs_glusterfs: Adapt to changes in libgfapi signatures.
  • BUG #13774: s3-vfs: Use ENOATTR in errno comparison for getxattr.
  • Justin Stephenson <>
  • BUG #13727: s3:libsmb: Honor disable_netbios option in smbsock_connect_send.