- =================================
- Release Notes for Samba 3.4.0pre1
+Release Announcements
+=====================
- =================================
-
-This is the first preview release of Samba 3.4. This is *not*
+This is the first release candidate of Samba 4.2. 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 3.4.0 include:
+Samba 4.2 will be the next version of the Samba suite.
-Authentication Changes:
-o Changed the way smbd handles untrusted domain names given during user
- authentication
-net Command Changes:
-o parameter syntax made more consistent
+UPGRADING
+=========
-Authentication Changes
-======================
+Read the "Winbindd/Netlogon improvements" section (below) carefully!
+
+
+NEW FEATURES
+============
+
+Transparent File Compression
+============================
+
+Samba 4.2.0 adds support for the manipulation of file and folder
+compression flags on the Btrfs filesystem.
+With the Btrfs Samba VFS module enabled, SMB2+ compression flags can
+be set remotely from the Windows Explorer File->Properties->Advanced
+dialog. Files flagged for compression are transparently compressed
+and uncompressed when accessed or modified.
+
+Previous File Versions with Snapper
+===================================
+
+The newly added Snapper VFS module exposes snapshots managed by
+Snapper for use by Samba. This provides the ability for remote
+clients to access shadow-copies via Windows Explorer using the
+"previous versions" dialog.
+
+Winbindd/Netlogon improvements
+==============================
+
+The whole concept of maintaining the netlogon secure channel
+to (other) domain controllers was rewritten in order to maintain
+global state in a netlogon_creds_cli.tdb. This is the proper fix
+for a large number of bugs:
+
+ https://bugzilla.samba.org/show_bug.cgi?id=6563
+ https://bugzilla.samba.org/show_bug.cgi?id=7944
+ https://bugzilla.samba.org/show_bug.cgi?id=7945
+ https://bugzilla.samba.org/show_bug.cgi?id=7568
+ https://bugzilla.samba.org/show_bug.cgi?id=8599
+
+In addition a strong session key is now required by default,
+which means that communication to older servers or clients
+might be rejected by default.
+
+For the client side we have the following new options:
+"require strong key" (yes by default), "reject md5 servers" (no by default).
+E.g. for Samba 3.0.37 you need "require strong key = no" and
+for NT4 DCs you need "require strong key = no" and "client NTLMv2 auth = no",
+
+On the server side (as domain controller) we have the following new options:
+"allow nt4 crypto" (no by default), "reject md5 client" (no by default).
+E.g. in order to allow Samba < 3.0.27 or NT4 members to work
+you need "allow nt4 crypto = yes"
+
+winbindd does not list group memberships for display purposes
+(e.g. getent group <domain\<group>) anymore by default.
+The new default is "winbind expand groups = 0" now,
+the reason for this is the same as for "winbind enum users = no"
+and "winbind enum groups = no". Providing this information is not always
+reliably possible, e.g. if there are trusted domains.
+
+Please consult the smb.conf manpage for more details on these new options.
+
+Winbindd use on the Samba AD DC
+===============================
+
+Winbindd is now used on the Samba AD DC by default, replacing the
+partial rewrite used for winbind operations in Samba 4.0 and 4.1.
+
+This allows more code to be shared, more options to be honoured, and
+paves the way for support for trusted domains in the AD DC.
+
+If required the old internal winbind can be activated by setting
+'server services = +winbind -winbindd'. Upgrading users with a server
+services parameter specified should ensure they change 'winbind' to
+'winbindd' to obtain the new functionality.
+
+The 'samba' binary still manages the starting of this service, there
+is no need to start the winbindd binary manually.
-Previously, when Samba was a domain member and a client was connecting using an
-untrusted domain name, such as BOGUS\user smbd would remap the untrusted
-domain to the primary domain smbd was a member of and attempt authentication
-using that DOMAIN\user name. This differed from how a Windows member server
-would behave. Now, smbd will replace the BOGUS name with it's SAM name. In
-the case where smbd is acting as a PDC this will be DOMAIN\user. In the case
-where smbd is acting as a domain member server this will be WORKSTATION\user.
-Thus, smbd will never assume that an incoming user name which is not qualified
-with the same primary domain, is part of smbd's primary domain.
+Winbind now requires secured connections
+========================================
-While this behavior matches Windows, it may break some workflows which depended
-on smbd to always pass through bogus names to the DC for verification. A new
-parameter "map untrusted to domain" can be enabled to revert to the legacy
-behavior.
+To improve protection against rouge domain controllers we now require
+that when we connect to an AD DC in our forest, that the connection be
+signed using SMB Signing. Set 'client signing = off' in the smb.conf
+to disable.
-net Command Changes
-===================
+Also and DCE/RPC pipes must be sealed, set 'require strong key =
+false' and 'winbind sealed pipes = false' to disable.
-The net command now accepts the common command line parameters most other Samba
-command line utilities use, with a couple of remaining differences:
+Finally, the default for 'client ldap sasl wrapping' has been set to
+'sign', to ensure the integrity of LDAP connections. Set 'client ldap
+sasl wrapping = plain' to disable.
--l still gives long output for net commands supporting the --long flag. This was
-more useful than the common --log-base parameter.
+Larger IO sizes for SMB2/3 by default
+=====================================
--i still tells net to read data from stdin (like --stdin) instead of toggling
-the common --scope flag.
+The default values for "smb2 max read", "smb2 max write" and "smb2 max trans"
+have been changed to 8388608 (8MiB) in order to match the default of
+Windows 2012R2.
--S still tells net the server to connect to (like --server) instead of
-negotiating the common --signing flag. As -S is probably used by most scripts
-doing net rpc commands, this would have been a high-impact change for little
-gain.
+Improved DCERPC man in the middle detection
+===========================================
-This change was mainly done to unify the authentification options. Here, one
-flag changed it's meaning and one useful flag was added.
+The DCERPC header signing has been implemented
+in addition to the dcerpc_sec_verification_trailer
+protection.
--N used to be the short version of --ntname. It now matches the Samba default of
---no-pass. Use this to stop net from prompting for a password if you want
-anonymous authentication.
+Overhauled "net idmap" command
+==============================
--A --authentication-file now takes an authentication file with the username and
-password you want net to use, avoiding a password prompt as with plain -U user
-or having to give a password on the command line as in -U user%pass.
+The command line interface of the "net idmap" command has been
+made systematic, and subcommands for reading and writing the autorid idmap
+database have been added. Note that the writing commands should be
+used with great care. See the net(8) manual page for details.
+
+tdb improvements
+================
+
+The tdb library, our core mechanism to store Samba-specific data on disk and
+share it between processes, has been improved to support process shared robust
+mutexes on Linux. These mutexes are available on Linux and Solaris and
+significantly reduce the overhead involved with tdb. To enable mutexes for
+tdb, set
+
+dbwrap_tdb_mutexes:* = yes
+
+in the [global] section of your smb.conf.
+
+Tdb file space management has also been made more efficient. This
+will lead to smaller and less fragmented databases.
+
+Messaging improvements
+======================
+
+Our internal messaging subsystem, used for example for things like oplock
+break messages between smbds or setting a process debug level dynamically, has
+been rewritten to use unix domain datagram messages.
+
+Clustering support
+==================
+
+Samba's file server clustering component CTDB is now integrated in the
+Samba tree. This avoids the confusion of compatibility of Samba and CTDB
+versions as existed previously.
+
+To build the Samba file server with cluster support, use the configure
+command line option --with-cluster-support. This will build clustered
+file server against the in-tree ctdb. Building clustered samba with
+previous versions of CTDB is no longer supported.
+
+CTDB is built separately from the ctdb/ sub-directory. To build CTDB,
+use the following steps:
+
+ $ cd ctdb
+ $ ./configure
+ $ make
+ # make install
-Last but not least net now always falls back to your local unix username if no
--U is specified and a username is needed. net rpc commands will now prompt for a
-password unless one is specified using either -U user%pass or -A auth_file.
######################################################################
+Changes
+#######
+
+smb.conf changes
+----------------
+
+ Parameter Name Description Default
+ -------------- ----------- -------
+
+ allow nt4 crypto New no
+ neutralize nt4 emulation New no
+ reject md5 client New no
+ reject md5 servers New no
+ require strong key New yes
+ smb2 max read Changed default 8388608
+ smb2 max write Changed default 8388608
+ smb2 max trans Changed default 8388608
+ winbind expand groups Changed default 0
+
+KNOWN ISSUES
+============
+
+
+#######################################
Reporting bugs & Development Discussion
#######################################
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 3.4 product in the project's Bugzilla
+be filed under the Samba 4.2 product in the project's Bugzilla
database (https://bugzilla.samba.org/).
git.samba.org / samba.git / blobdiff