[Samba] [Announce] Samba 3.6.0pre2 Preview Release Available for Download

Karolin Seeger kseeger at samba.org
Tue Apr 12 12:01:44 MDT 2011

Release Announcements

This is the second preview release of Samba 3.6.0.  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/.

Major enhancements in Samba 3.6.0 include:

Changed security defaults

Samba 3.6 has adopted a number of improved security defaults that will
impact on existing users of Samba.

 client ntlmv2 auth = yes
 client use spnego principal = no
 send spnego principal = no

The impact of 'client ntlmv2 auth = yes' is that by default we will not
use NTLM authentication as a client.  This applies to the Samba client
tools such as smbclient and winbind, but does not change the separately
released in-kernel CIFS client.  To re-enable the poorer NTLM encryption
set '--option=clientusentlmv2auth=no' on your smbclient command line, or
set 'client ntlmv2 auth = no' in your smb.conf

The impact of 'client use spnego principal = no' is that we may be able
to use Kerberos to communicate with a server less often in smbclient,
winbind and other Samba client tools.  We may fall back to NTLMSSP in
more situations where we would previously rely on the insecure
indication from the 'NegProt' CIFS packet.  This mostly occursed when
connecting to a name alias not recorded as a servicePrincipalName for
the server.  This indication is not available from Windows 2008 or later
in any case, and is not used by modern Windows clients, so this makes
Samba's behaviour consistent with other clients and against all servers.

The impact of 'send spnego principal = no' is to match Windows 2008 and
not to send this principal, making existing clients give more consistent
behaviour (more likely to fall back to NTLMSSP) between Samba and
Windows 2008, and between Windows versions that did and no longer use
this insecure hint.

SMB2 support

SMB2 support in 3.6.0 is fully functional (with one omission),
and can be enabled by setting:

max protocol = SMB2

in the [global] section of your smb.conf and re-starting
Samba. All features should work over SMB2 except the modification
of user quotas using the Windows quota management tools.

As this is the first release containing what we consider
to be a fully featured SMB2 protocol, we are not enabling
this by default, but encourage users to enable SMB2 and
test it. Once we have enough confirmation from Samba
users and OEMs that SMB2 support is stable in wide user
testing we will enable SMB2 by default in a future Samba

Internal Winbind passdb changes

Winbind has been changed to use the internal samr and lsa rpc pipe to get
local user and group information instead of calling passdb functions. The
reason is to use more of our infrastructure and test this infrastructure by
using it. With this approach more code in Winbind is shared.

New Spoolss code

The spoolss and the old RAP printing code have been completely
overhauled and refactored.

All calls from lanman/printing code has been changed to go through the
spoolss RPC interfaces, this allows us to keep all checks in one place
and avoid special cases in the main printing code.
Printing code has been therefore confined within the spoolss code.

All the printing code, including the spoolss RPC interfaces has been
changed to use the winreg RPC interfaces to store all data.
All data has been migrated from custom, arbitrary TDB files to the
registry interface. This transition allow us to present correct data to
windows client accessing the server registry through the winreg RPC
interfaces to query for printer data. Data is served out from a real
registry implementation and therefore arguably 100% forward compatible.

Migration code from the previous TDB files formats is provided. This
code is automatically invoked the first time the new code is run on the
server. Although manual migration is also available using the 'net
printer migrate' command.

These changes not only make all the spoolss code much more closer to
"the spec", it also greatly improves our internal testing of both
spoolss and winreg interfaces, and reduces overall code duplication.

As part of this work, new tests have been also added to increase

This code will also allow, in future, an easy transition to split out
the spooling functions into a separate daemon for those OEMs that do not
need printing functionality in their appliances, reducing the code

ID Mapping Changes

The id mapping configuration has been a source of much grief in the past.
For this release, id mapping has been rewritten yet again with the goal
of making the configuration more simple and more coherent while keeping
the needed flexibility and even adding to the flexibility in some respects.

The major change that implies the configuration simplifications is at
the heart of the id mapping system: The separation of the "idmap alloc
system" that is responsible for the unix id counters in the tdb, tdb2
and ldap idmap backends from the id mapping code itself has been removed.
The sids_to_unixids operation is now atomic and encapsulates (if needed)
the action of allocating a unix id for a mapping that is to be created.
Consequently all idmap alloc configuration parameters have vanished and
it is hence now also not possible any more to specify an idmap alloc
backend different from the idmap backend. Each idmap backend uses its
own idmap unixid creation mechanism transparently.

As a consequence of the id mapping changes, the methods that are used
for storing and deleting id mappings have been removed from the winbindd
API. The "net idmap dump/restore" commands have been rewritten to
not speak through winbindd any more but directly act on the databases.
This is currently available for the tdb and tdb2 backends, the implementation
for ldap still missing.

The allocate_id functionality is preserved for the unix id creator of the
default idmap configuration is also used as the source of unix ids
for the group mapping database and for the posix attributes in a
ldapsam:editposix setup.

As part of the changes, the default idmap configuration has been
changed to be more coherent with the per-domain configuration.
The parameters "idmap uid", "idmap gid" and "idmap range" are now
deprecated in favour of the systematic "idmap config * : range"
and "idmap config * : backend" parameters. The reason for this change
is that the old options only provided an incomplete and hence deceiving
backwards compatibility, which was a source of many problems with
upgrades. By introducing this change in configuration, it should be
brought to the conciousness of the users that even the simple
id mapping is not working exactly as in Samba 3.0 versions any more.

Endpoint Mapper

As Microsoft is more and more relying on endpoint mapper and we didn't have a
complete implementation we decided to create an instance for Samba. The
endpoint mapper is like a DNS server but for ports. If you want to talk to a
certain RPC service over TCP/IP, you just ask the endpoint mapper on which
port it is running. Then you can connect to the service and make sure that it
is running.
The code is deactivated by default, because it needs more testing and it
doesn't scale yet. We will work on these limitations and hopefully release it
with pre3. If you want to enable and test the endpoint mapper you can set
"rpc_server:epmapper = daemon" in the smb.conf file.

Internal restructuring

Ongoing internal restructuring for better separation of internal subsystem to
achieve a faster build, smaller binaries and cleaner dependencies for the samba3
waf build.

SMB Traffic Analyzer

Added the new SMB Traffic Analyzer (SMBTA) VFS module protocol 2
featuring encryption, multiple arguments, and easier parseability. A new
tool 'smbta-util' has been created to control the encryption behaviour
of SMBTA. For compatibility, SMBTA by default operates on version 1.
There are programs consuming the data that the module sends.

More information can be found on

NFS quota backend on Linux

A new nfs quota backend for Linux has been added that is based
on the existing Solaris/FreeBSD implementation. This allows samba
to communicate correct diskfree information for nfs imports that
are re-exported as samba shares.


smb.conf changes

   Parameter Name                      Description     Default
   --------------                      -----------     -------

   async smb echo handler	       New	       No
   client ntlmv2 auth		       Changed Default Yes
   client use spnego principal	       New	       No
   ctdb locktime warn threshold	       New	       0
   idmap alloc backend		       Removed
   log writeable files on exit	       New	       No
   multicast dns register	       New	       Yes
   ncalrpc dir			       New
   send spnego principal	       New	       No
   smb2 max credits		       New	       128
   smb2 max read		       New	       1048576
   smb2 max trans		       New	       1048576
   smb2 max write		       New	       1048576
   strict allocate		       Changed Default Yes
   username map cache time	       New	       0
   winbind max clients		       New	       200

Commit Highlights

o   Michael Adam <obnox at samba.org>
    * ID Mapping changes.

o   Jeremy Allison <jra at samba.org>
    * Implement SMB2 support.

o   Stefan Metzmacher <metze at samba.org>
    * Implement SMB2 support.

o   Andreas Schneider <asn at samba.org>
    * Add an Endpoint Mapper daemon.

Changes since 3.6.0pre1

o   Michael Adam <obnox at samba.org>
    * ID Mapping changes.
    * Add "--option" to 'testparm'.

o   Jeremy Allison <jra at samba.org>
    * BUG 7080: Quota only shown when logged as root.
    * BUG 7863: Unlink may unlink wrong file when hardlinks are involved.
    * BUG 7996: Sgid bit lost on folder rename.
    * BUG 8040: Fix smbclient segfault with Cyrillic netbios names.
    * Fix crash bug on smbd shutdown when using FOPENDIR().
    * Ensure we don't return an incorrect access mask.
    * Fix bug against the new Mac client.
    * Fix leak in error path.
    * Fix error where Windows client spoolss returns WERR_INVALID_DATA.

o   Christian Ambach <christian.ambach at de.ibm.com>
    * Fix a segfault in the krb5 locator plugin.
    * Enable sharesec for registry shares.

o   Andrew Bartlett <abartlet at samba.org>
    * Fix memory leak in "security=share" and "force user".

o   Björn Baumbach <bb at sernet.de>
    * BUG 7875: Fix 'nmbd --port'.
    * BUG 7880: cmd_spoolss_deletedriver() returned without checking all

o   Gregor Beck <gbeck at sernet.de>
    * Add new 'net idmap check' command.
    * Add new 'net idmap delete' command.
    * Fix segfault on missing input file in 'net idmap restore'.

o   Olly Betts <olly at survex.com>
    * Fix 'net usersidlist' not to skip every other user.

o   Gregor Beck <gbeck at sernet.de>
    * Add "net idmap check", a check and repair tool for the
      id mapping database.

o   Günther Deschner <gd at samba.org>
    * BUG 7690: Retry DNS updates when connection to one nameserver has failed.
    * BUG 7945: Let winbind try to use samlogon validation level 6.
    * Fix Coverity ID 2041.
    * Fix potential crash bug in spoolss_PrinterEnumValues push path.
    * Internal restructuring.
    * Don't wipe out all printer drivers when only one should be deleted.
    * Fix winbindd_dual_pam_auth_samlogon() for NT4 domains.

o   David Disseldorp <ddiss at suse.de>
    * BUG 7915: Fix cups pcap reload with no printers.
    * BUG 8040: Fix smbclient segfault with Cyrillic netbios names.
    * Fix memory leak in print_cups.c.
    * Remove duplicate cups response processing code.
    * Follow force user/group for driver IO.
    * Initiate pcap reload from parent smbd.
    * Reload shares after pcap cache fill.

o   Björn Jacke <bj at sernet.de>
    * BUG 8033: Add explicit configure option whether or not to enable dmapi

o   Volker Lendecke <vl at samba.org>
    * BUG 7917: Fix bug in chain_reply.
    * BUG 7940: Fall back for utimes calls.
    * BUG 8009: Fix getting username in 'net rap session'.
    * BUG 8010: Use jenkins hash for str_checksum.
    * BUG 8042: Fix file creation on OS/X.
    * Fix numerous Coverity IDs.
    * Fix a memory leak in check_sam_security_info3.
    * Fix a segfault in the nss wrapper when libnss_winbind.so is not loadable.
    * Make "net sam list [users|workstations]" list only the right things.
    * Fix a potential memleak in secrets_fetch_trusted_domain_password.
    * Use the right credentials in check_netlogond_security.
    * Add support for AF_NETLINK addr notifications.
    * Fork multiple Winbind children per domain.
    * Fix a deadlock between smbd and ctdbd.
    * Add 'wbinfo --dc-info'.
    * Make "nmbd socket dir" configurable.
    * Fix a valgrind error.
    * Fix a memleak in receive_getdc_response.

o   Nikolay Martynov <mar.kolya at gmail.com>
    * BUG 8010: Fix inode generation so nautilus can count total dir size

o   Stefan Metzmacher <metze at samba.org>
    * BUG 7567: Fix printing from Windows 7.
    * BUG 7899: Don't return "-1" on success in 'net rpc vampire keytab'.
    * BUG 7944: Catch lookup_names/sids schannel errors over ncacn_ip_tcp.
    * Don't grant SEC_STD_DELETE always to the owner of a file.
    * Fix segfaults on addrchange errors in Winbind.
    * Allow machine accounts as members in groupdb.

o   Jonathan Nieder <jrnieder at gmail.com>
    * BUG 6837: Make "rlimit_max below minimum Windows limit" notification less

o   Andreas Schneider <asn at samba.org>
    * Add an Endpoint Mapper daemon.
    * Add IPv6 support for the endpoint mapper.
    * Free unused memory in the rpc server.
    * Fix possible segfaults in svcctl server.
    * Fix possible segfault with client_id in rpc server.
    * Add a 'svcctl shutdown' function to rpc server.
    * Fix a resource leak in net_afs.
    * Fix a resource leak in smbta-util.
    * Fix possible resource leak in net_usershare.
    * Fix possible resource leak in 'smbget'.
    * Fix possible resource leak in 'smbfilter'.
    * Fix a possible null pointer dereference in smbd.

o   Pavel Shilovsky <piastry at etersoft.ru>
    * BUG 7928: Fix problems with "kernel oplocks" option set to "no".
    * Ensure we send the direct levelII oplock break to the correct fid.

o   Simo Sorce <idra at samba.org>
    * Fix private libdir and codepages paths.

o   Andrew Tridgell <tridge at samba.org>
    * Fix a valgrind error.

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 3.6 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 6568B7EA).  The source code can be downloaded


The release notes are available online at:


Binary packages will be made available on a volunteer basis from


Our Code, Our Bugs, Our Responsibility.

                        The Samba Team

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