Release Announcements
=====================
-This is the first pre release of Samba 4.17. This is *not*
+This is the first pre release of Samba 4.21. 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 4.17 will be the next version of the Samba suite.
+Samba 4.21 will be the next version of the Samba suite.
UPGRADING
=========
+LDAP TLS/SASL channel binding support
+-------------------------------------
+
+The ldap server supports SASL binds with
+kerberos or NTLMSSP over TLS connections
+now (either ldaps or starttls).
+
+Setups where 'ldap server require strong auth = allow_sasl_over_tls'
+was required before, can now most likely move to the
+default of 'ldap server require strong auth = yes'.
+
+If SASL binds without correct tls channel bindings are required
+'ldap server require strong auth = allow_sasl_without_tls_channel_bindings'
+should be used now, as 'allow_sasl_over_tls' will generate a
+warning in every start of 'samba', as well as '[samba-tool ]testparm'.
+
+This is similar to LdapEnforceChannelBinding under
+HKLM\SYSTEM\CurrentControlSet\Services\NTDS\Parameters
+on Windows.
+
+All client tools using ldaps also include the correct
+channel bindings now.
+
NEW FEATURES/CHANGES
====================
-Bronze bit and S4U support with MIT Kerberos 1.20
--------------------------------------------------
-
-In 2020 Microsoft Security Response Team received another Kerberos-related
-report. Eventually, that led to a security update of the CVE-2020-17049,
-Kerberos KDC Security Feature Bypass Vulnerability, also known as a ‘Bronze
-Bit’. With this vulnerability, a compromised service that is configured to use
-Kerberos constrained delegation feature could tamper with a service ticket that
-is not valid for delegation to force the KDC to accept it.
+LDB no longer a standalone tarball
+----------------------------------
-With the release of MIT Kerberos 1.20, Samba AD DC is able able to mitigate the
-‘Bronze Bit’ attack. MIT Kerberos KDC's KDB (Kerberos Database Driver) API was
-changed to allow passing more details between KDC and KDB components. When built
-against MIT Kerberos, Samba AD DC supports MIT Kerberos 1.19 and 1.20 versions
-but 'Bronze Bit' mitigation is provided only with MIT Kerberos 1.20.
+LDB, Samba's LDAP-like local database and the power behind the Samba
+AD DC, is no longer available to build as a distinct tarball, but is
+instead provided as an optional public library.
-In addition to fixing the ‘Bronze Bit’ issue, Samba AD DC now fully supports
-S4U2Self and S4U2Proxy Kerberos extensions.
+If you need ldb as a public library, say to build sssd, then use
+ ./configure --private-libraries='!ldb'
-Resource Based Constrained Delegation (RBCD) support
-----------------------------------------------------
+This re-integration allows LDB tests to use the Samba's full selftest
+system, including our knownfail infrastructure, and decreases the work
+required during security releases as a coordinated release of the ldb
+tarball is not also required.
-Samba AD DC built with MIT Kerberos 1.20 offers RBCD support now. With MIT
-Kerberos 1.20 we have complete RBCD support passing Sambas S4U testsuite.
-Note that samba-tool lacks support for setting this up yet!
+This approach has been demonstrated already in Debian, which is already
+building Samba and LDB is this way.
-To complete RBCD support and make it useful to Administrators we added the
-Asserted Identity [1] SID into the PAC for constrained delegation. This is
-available for Samba AD compiled with MIT Kerberos 1.20.
+As part of this work, the pyldb-util public library, not known to be
+used by any other software, is made private to Samba.
-[1] https://docs.microsoft.com/en-us/windows-server/security/kerberos/kerberos-constrained-delegation-overview
+LDB Module API Python bindings removed
+--------------------------------------
+The LDB Modules API, which we do not promise a stable ABI or API for,
+was wrapped in python in early LDB development. However that wrapping
+never took into account later changes, and so has not worked for a
+number of years. Samba 4.21 and LDB 2.10 removes this unused and
+broken feature.
REMOVED FEATURES
================
Parameter Name Description Default
-------------- ----------- -------
+ ldap server require strong auth new values
KNOWN ISSUES
============
-https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.17#Release_blocking_bugs
+https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.21#Release_blocking_bugs
#######################################
#######################################
Please discuss this release on the samba-technical mailing list or by
-joining the #samba-technical IRC channel on irc.libera.chat.
+joining the #samba-technical:matrix.org matrix room, or
+#samba-technical IRC channel on irc.libera.chat
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
git.samba.org / samba.git / blobdiff