Release Announcements
=====================
-This is the first preview release of Samba 4.11. This is *not*
+This is the first preview release of Samba 4.12. 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 4.11 will be the next version of the Samba suite.
+Samba 4.12 will be the next version of the Samba suite.
UPGRADING
NEW FEATURES/CHANGES
====================
-Default samba process model
----------------------------
+Python 3.5 Required
+-------------------
-The default for the --model argument passed to the samba executable has changed
-from 'standard' to 'prefork'. This means a difference in the number of samba
-child processes that are created to handle client connections. The previous
-default would create a separate process for every LDAP or NETLOGON client
-connection. For a network with a lot of persistent client connections, this
-could result in significant memory overhead. Now, with the new default of
-'prefork', the LDAP, NETLOGON, and KDC services will create a fixed number of
-worker processes at startup and share the client connections amongst these
-workers. The number of worker processes can be configured by the 'prefork
-children' setting in the smb.conf (the default is 4).
+Samba's minimum runtime requirement for python was raised to Python
+3.4 with samba 4.11. Samba 4.12 raises this minimum version to Python
+3.5 both to access new features and because this is the oldest version
+we test with in our CI infrastructure.
+
+(Build time support for the file server with Python 2.6 has not
+changed)
+
+Removing in-tree cryptography: GnuTLS 3.4.7 required
+----------------------------------------------------
+
+Samba is making efforts to remove in-tree cryptographic functionality,
+and to instead rely on externally maintained libraries. To this end,
+Samba has chosen GnuTLS as our standard cryptographic provider.
+
+Samba now requires GnuTLS 3.4.7 to be installed (including development
+headers at build time) for all configurations, not just the Samba AD
+DC.
+
+Thanks to this work Samba no longer ships an in-tree DES
+implementation and on GnuTLS 3.6.5 or later Samba will include no
+in-tree cryptography other than the MD4 hash and that
+implemented in our copy of Heimdal.
+
+Using GnuTLS for SMB3 encryption you will notice huge performance and copy
+speed improvements. Tests with the CIFS Kernel client from Linux Kernel 5.3
+show a 3x speed improvement for writing and a 2.5x speed improvement for reads!
+
+NOTE WELL: The use of GnuTLS means that Samba will honour the
+system-wide 'FIPS mode' (a reference to the US FIPS-140 cryptographic
+standard) and so will not operate in many still common situations if
+this system-wide parameter is in effect, as many of our protocols rely
+on outdated cryptography.
+
+A future Samba version will mitigate this to some extent where good
+cryptography effectively wraps bad cryptography, but for now that above
+applies.
+
+
+"net ads kerberos pac save" and "net eventlog export"
+-----------------------------------------------------
+
+The "net ads kerberos pac save" and "net eventlog export" tools will
+no longer silently overwrite an existing file during data export. If
+the filename given exits, an error will be shown.
+
+VFS
+===
+
+SMB_VFS_NTIMES
+--------------
+
+Samba now uses a sentinel value based on utimensat(2) UTIME_OMIT to denote
+to-be-ignored timestamp variables passed to the SMB_VFS_NTIMES() VFS function.
+
+VFS modules can check whether any of the time values inside a struct
+smb_file_time is to be ignored by calling is_omit_timespec() on the value.
REMOVED FEATURES
================
+The smb.conf parameter "write cache size" has been removed.
+
+Since the in-memory write caching code was written, our write path has
+changed significantly. In particular we have gained very flexible
+support for async I/O, with the new linux io_uring interface in
+development. The old write cache concept which cached data in main
+memory followed by a blocking pwrite no longer gives any improvement
+on modern systems, and may make performance worse on memory-contrained
+systems, so this functionality should not be enabled in core smbd
+code.
+
+In addition, it complicated the write code, which is a performance
+critical code path.
+
+If required for specialist purposes, it can be recreated as a VFS
+module.
+
+BIND9_FLATFILE deprecated
+-------------------------
+
+The BIND9_FLATFILE DNS backend is deprecated in this release and will
+be removed in the future. This was only practically useful on a single
+domain controller or under expert care and supervision.
+
+This release removes the "rndc command" smb.conf parameter, which
+supported this configuration by writing out a list of DCs permitted to
+make changes to the DNS Zone and nudging the 'named' server if a new
+DC was added to the domain. Administrators using BIND9_FLATFILE will
+need to maintain this manually from now on.
+
+
+Retiring DES encryption types in Kerberos.
+------------------------------------------
+With this release, support for DES encryption types has been removed from
+Samba, and setting DES_ONLY flag for an account will cause Kerberos
+authentication to fail for that account (see RFC-6649).
+
+Samba-DC: DES keys no longer saved in DB.
+-----------------------------------------
+When a new password is set for an account, Samba DC will store random keys
+in DB instead of DES keys derived from the password. If the account is being
+migrated to Windbows or to an older version of Samba in order to use DES keys,
+the password must be reset to make it work.
+
+Heimdal-DC: removal of weak-crypto.
+-----------------------------------
+Following removal of DES encryption types from Samba, the embedded Heimdal
+build has been updated to not compile weak crypto code (HEIM_WEAK_CRYPTO).
+
smb.conf changes
================
Parameter Name Description Default
-------------- ----------- -------
+ nfs4:acedup Changed default merge
+ rndc command Removed
+ write cache size Removed
KNOWN ISSUES
============
-https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.11#Release_blocking_bugs
+https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.12#Release_blocking_bugs
#######################################
git.samba.org / bbaumbach / samba-autobuild / .git / blobdiff