Release Announcements
=====================
-This is the first pre release of Samba 4.20. 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 4.20 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
====================
-New Minimum MIT Krb5 version for Samba AD Domain Controller
------------------------------------------------------------
+LDB no longer a standalone tarball
+----------------------------------
+
+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.
+
+If you need ldb as a public library, say to build sssd, then use
+ ./configure --private-libraries='!ldb'
+
+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 now requires MIT 1.21 when built against a system MIT Krb5 and
-acting as an Active Directory DC. This addresses the issues that were
-fixed in CVE-2022-37967 (KrbtgtFullPacSignature) and ensures that
-Samba builds against the MIT version that allows us to avoid that
-attack.
+This approach has been demonstrated already in Debian, which is already
+building Samba and LDB is this way.
-Removed dependency on Perl JSON module
+As part of this work, the pyldb-util public library, not known to be
+used by any other software, is made private to Samba.
+
+LDB Module API Python bindings removed
--------------------------------------
-Distributions are advised that the Perl JSON package is no longer
-required by Samba builds that use the imported Heimdal. The build
-instead uses Perl's JSON::PP built into recent perl5 versions.
+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.
-Current lists of packages required by Samba for major distributions
-are found in the bootstrap/generated-dists/ directory of a Samba
-source tree. While there will be some differences - due to features
-chosen by packagers - comparing these lists with the build dependencies
-in a package may locate other dependencies we no longer require.
+Using ldaps from 'winbindd' and 'net ads'
+-----------------------------------------
+Beginning with Samba 3.0.22 the 'ldap ssl = start tls' option also
+impacted LDAP connections to active directory domain controllers.
+Using the STARTTLS operation on LDAP port 389 connections. Starting
+with Samba 3.5.0 'ldap ssl ads = yes' was required in addition in
+order let to 'ldap ssl = start tls' have any effect on those
+connections.
-REMOVED FEATURES
-================
+'ldap ssl ads' was deprecated with Samba 4.8.0 and removed together
+with the whole functionality in Samba 4.14.0, because it didn't support
+tls channel bindings required for the sasl authentication.
-Get locally logged on users from utmp
--------------------------------------
+The functionality is now re-added using the correct channel bindings
+based on the gnutls based tls implementation we already have, instead
+of using the tls layer provided by openldap. This makes it available
+and consistent with all LDAP client libraries we use and implement on
+our own.
+
+The 'client ldap sasl wrapping' option gained the two new possible values:
+'starttls' (using STARTTLS on tcp port 389)
+and
+'ldaps' (using TLS directly on tcp port 636).
-The Workstation Service Remote Protocol [MS-WKST] calls NetWkstaGetInfo
-level 102 and NetWkstaEnumUsers level 0 and 1 return the list of locally
-logged on users. Samba was getting the list from utmp, which is not
-Y2038 safe. This feature has been completely removed and Samba will
-always return an empty list.
+If you had 'ldap ssl = start tls' and 'ldap ssl ads = yes'
+before, you can now use 'client ldap sasl wrapping = starttls'
+in order to get STARTTLS on tcp port 389.
+
+As we no longer use the openldap tls layer it is required to configure the
+correct certificate trusts with at least one of the following options:
+'tls trust system cas', 'tls ca directories' or 'tls cafile'.
+While 'tls verify peer' and 'tls crlfile' are also relevant,
+see 'man smb.conf' for further details.
+
+
+REMOVED FEATURES
+================
smb.conf changes
Parameter Name Description Default
-------------- ----------- -------
- smb3 unix extensions removed always offered
+ client ldap sasl wrapping new values
+ client use spnego principal removed
+ ldap server require strong auth new values
+ tls trust system cas new
+ tls ca directories new
KNOWN ISSUES
============
-https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.20#Release_blocking_bugs
+https://wiki.samba.org/index.php/Release_Planning_for_Samba_4.21#Release_blocking_bugs
#######################################