Updating documentation for 3.0.23. Jerry, please check these changes.

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+<?xml version="1.0" encoding="iso-8859-1"?>
+<!DOCTYPE chapter PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
+<chapter id="ChangeNotes">
+<chapterinfo>
+	&author.jht;
+	&author.jerry;
+</chapterinfo>
+
+<title>Important Samba-3.0.23 Change Notes</title>
+
+<para>
+Samba is a fluid and ever changing project. Sometimes it is difficult to figure out which part,
+or parts, of the HOWTO documentation should be updated tio reflect the impact of new or modified
+features. At other times it becomes clear that the documentation is in need of being restructured.
+</para>
+
+<para>
+In recent times a group of Samba users has joined the thrust to create a new <ulink
+url="http://wiki.samba.org/">Samba Wiki</ulink> that is slated to become the all-singing and all-dancing
+new face of Samba documentation. Hopefully, the Wiki will benefit from greater community input and
+thus may be kept more up to date. Until that golden dream materializes and matures it is necessary to
+continue to maintain the HOWTO. This chapter will document major departures from earlier behavior until
+such time as the body of this HOWTO is restructured or modified.
+</para>
+
+<para>
+This chapter is new to the release of the HOWTO for Samba 3.0.23. It includes much of the notes provided
+in the <filename>WHATSNEW.txt</filename> file that is included with the Samba source code release tarball.
+</para>
+
+<sect1>
+<title>User and Group Changes</title>
+
+<para>
+The change documented here affects unmapped user and group accounts only.
+</para>
+
+<para>
+<indexterm><primary>user</primary></indexterm>
+<indexterm><primary>group</primary></indexterm>
+<indexterm><primary>Relative Identifiers</primary><see>RID</see></indexterm>
+<indexterm><primary>net</primary><secondary>groupmap</secondary></indexterm>
+<indexterm><primary>net</primary><secondary>rpc</secondary><tertiary>vampire</tertiary></indexterm>
+The user and group internal management routines have been rewritten to prevent overlaps of
+assigned Relative Identifiers (RIDs).  In the past the has been a potential problem when
+either manually mapping Unix groups with the <command>net groupmap</command> command or
+when migrating a Windows domain to a Samba domain by executing:
+<command>net rpc vampire</command>.
+</para>
+
+<para>
+<indexterm><primary>SID</primary></indexterm>
+<indexterm><primary>SAM</primary></indexterm>
+<indexterm><primary>RID</primary></indexterm>
+<indexterm><primary>net</primary><secondary>getlocalsid</secondary></indexterm>
+Unmapped users are now assigned a SID in the <literal>S-1-22-1</literal> domain and unmapped
+groups are assigned a SID in the <literal>S-1-22-2</literal> domain.  Previously they were
+assign a RID within the SAM on the Samba server.  For a domain controller this would have been under the
+authority of the domain SID where as on a member server or standalone server, this would have
+been under the authority of the local SAM (see the man page for <command>net getlocalsid</command>).
+</para>
+
+<para>
+<indexterm><primary>unmapped users</primary></indexterm>
+<indexterm><primary>unmapped groups</primary></indexterm>
+<indexterm><primary>SID</primary></indexterm>
+<indexterm><primary>NTFS</primary></indexterm>
+<indexterm><primary>GID</primary></indexterm>
+The result is that any unmapped users or groups on an upgraded Samba domain controller may
+be assigned a new SID.  Because the SID rather than a name is stored in Windows security
+descriptors, this can cause a user to no longer have access to a resource for example if a
+file was copied from a Samba file server to a local Windows client NTFS partition.  Any files
+stored on the Samba server itself will continue to be accessible because UNIX stores the UNIX
+GID and not the SID for authorization checks.
+</para>
+
+<para>
+An example helps to illustrate the change:
+</para>
+
+<para>
+<indexterm><primary>group mapping</primary></indexterm>
+<indexterm><primary>GID</primary></indexterm>
+<indexterm><primary>ACL</primary></indexterm>
+<indexterm><primary>SID</primary></indexterm>
+Assume that a group named <emphasis>developers</emphasis> exists with a UNIX GID of 782. In this
+case this user does not exist in Samba's group mapping table. It would be perfectly normal for
+this group to be appear in an ACL editor.  Prior to Samba-3.0.23, the group SID might appear as
+<literal>S-1-5-21-647511796-4126122067-3123570092-2565</literal>. 
+</para>
+
+<para>
+<indexterm><primary>SID</primary></indexterm>
+<indexterm><primary>NTFS</primary></indexterm>
+<indexterm><primary>access</primary></indexterm>
+<indexterm><primary>group permissions</primary></indexterm>
+With the release of Samba-3.0.23, the group SID would be reported as <literal>S-1-22-2-782</literal>.
+Any security descriptors associated with files stored on a Windows NTFS disk partition will not allow
+access based on the group permissions if the user was not a member of the
+<literal>S-1-5-21-647511796-4126122067-3123570092-2565</literal>  group. 
+Because this group SID is <literal>S-1-22-2-782</literal> and not reported in a user's token,
+Windows would fail the authorization check even though both SIDs in some respect refer to the
+same UNIX group.
+</para>
+
+<para>
+<indexterm><primary>group mapping</primary></indexterm>
+<indexterm><primary>SID</primary></indexterm>
+The workaround for versions of Samba prior to 3.0.23, is to create a manual domain group mapping
+entry for the group <emphasis>developers</emphasis> to point at the
+<literal>S-1-5-21-647511796-4126122067-3123570092-2565</literal> SID. With the release of Samba-3.0.23 this
+workaround is no longer needed.
+</para>
+
+</sect1>
+
+<sect1>
+<title>Passdb Changes</title>
+
+<para>
+<indexterm><primary>backends</primary></indexterm>
+<indexterm><primary>GID</primary></indexterm>
+<indexterm><primary>SQL</primary></indexterm>
+<indexterm><primary>XML</primary></indexterm>
+The <smbconfoption name="passdb backend"/> parameter no long accepts multiple passdb backends in a
+chained configuration.  Also be aware that the SQL and XML based passdb modules have been
+removed in the Samba-3.0.23 release.  More information regarding external support for a SQL
+passdb module can be found on the  <ulink url="http://pdbsql.sourceforge.net/">pdbsql</ulink web site.
+</para>
+
+</sect1>
+
+<sect1>
+<title>Group Mapping Changes in Samba-3.0.23</title>
+
+<para>
+<indexterm><primary>default mapping</primary></indexterm>
+<indexterm><primary>Domain Admins</primary></indexterm>
+<indexterm><primary>smbpasswd</primary></indexterm>
+<indexterm><primary>tdbsam</primary></indexterm>
+<indexterm><primary>passdb backend</primary></indexterm>
+<indexterm><primary>group mappings</primary></indexterm>
+<indexterm><primary>GID</primary></indexterm>
+<indexterm><primary>SID</primary></indexterm>
+<indexterm><primary>IDMAP</primary></indexterm>
+<indexterm><primary>winbindd</primary></indexterm>
+<indexterm><primary>domain groups</primary></indexterm>
+The default mapping entries for groups such as <literal>Domain Admins</literal> are no longer
+created when using an <literal>smbpasswd</literal> file or a <literal>tdbsam</literal> passdb
+backend.  This means that it is necessary to explicitly execute the <command>net groupmap add</command>
+to create group mappings, rather than use the <command>net groupmap modify</command> method to create the
+Windows group SID to UNIX GID mappings.  This change has no effect on winbindd's IDMAP functionality
+for domain groups.
+</para>
+
+</sect1>
+
+<sect1>
+<title>LDAP Changes in Samba-3.0.23</title>
+
+<para>
+<indexterm><primary>LDAP schema</primary></indexterm>
+<indexterm><primary>sambaSID</primary></indexterm>
+<indexterm><primary>OpenLDAP</primary></indexterm>
+<indexterm><primary>slapindex</primary></indexterm>
+<indexterm><primary>slapd.conf</primary></indexterm>
+There has been a minor update the Samba LDAP schema file. A substring matching rule has been
+added to the <literal>sambaSID</literal> attribute definition.  For OpenLDAP servers, this
+will require the addition of <literal>index sambaSID sub</literal> to the
+<filename>slapd.conf</filename> configuration file.  It will be necessary to execute the 
+<command>slapindex</command> command after making this change. There has been no change to the
+actual data storage schema.
+</para>
+
+</sect1>
+
+</chapter>