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133 lines
4.1 KiB
XML
133 lines
4.1 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
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<refentry id="idmap_autorid.8">
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<refmeta>
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<refentrytitle>idmap_autorid</refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="source">Samba</refmiscinfo>
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<refmiscinfo class="manual">System Administration tools</refmiscinfo>
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<refmiscinfo class="version">3.6</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>idmap_autorid</refname>
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<refpurpose>Samba's idmap_autorid Backend for Winbind</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<title>DESCRIPTION</title>
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<para>The idmap_autorid backend provides a way to use an algorithmic
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mapping scheme to map UIDs/GIDs and SIDs that is more deterministic
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than idmap_tdb and easier to configure than idmap_rid.</para>
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<para>The module works similar to idmap_rid, but it automatically
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configures the range to be used for each domain, so there is no need
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to specify a specific range for each domain in the forest, the only
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configuration that is needed is the range of uid/gids that shall
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be used for user/group mappings and an optional size of the ranges
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to be used.</para>
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<para>The mappings of which domain is mapped to which range is stored
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in autorid.tdb, thus you should backup this database regularly.</para>
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<para>Due to the algorithm being used, it is the module that is
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most easy to use as it only requires a minimal configuration.</para>
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</refsynopsisdiv>
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<refsect1>
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<title>IDMAP OPTIONS</title>
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<variablelist>
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<varlistentry>
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<term>rangesize = numberofidsperdomain</term>
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<listitem><para>
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Defines the available number of uids/gids per domain. The
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minimum needed value is 2000. SIDs with RIDs larger than this
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value cannot be mapped, are ignored and the corresponding map
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is discarded. Choose this value carefully, as this should
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not be changed after the first ranges for domains have been
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defined, otherwise mappings between domains will get intermixed
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leading to unpredictable results. Please note that RIDs in Windows
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Domains usually start with 500 for builtin users and 1000
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for regular users. As the parameter cannot be changed later, please
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plan accordingly for your expected number of users in a domain
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with safety margins.
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</para>
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<para>The default value is 100000.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>THE MAPPING FORMULAS</title>
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<para>
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The Unix ID for a RID is calculated this way:
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<programlisting>
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ID = IDMAP UID LOW VALUE + DOMAINRANGENUMBER * RANGESIZE + RID
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</programlisting>
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</para>
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<para>
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Correspondingly, the formula for calculating the RID for a
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given Unix ID is this:
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<programlisting>
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RID = ID - IDMAP UID LOW VALUE - DOMAINRANGENUMBER * RANGESIZE
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</programlisting>
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</para>
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</refsect1>
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<refsect1>
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<title>EXAMPLES</title>
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<para>
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This example shows you the minimal configuration that will
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work for the principial domain and 19 trusted domains.
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</para>
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<programlisting>
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[global]
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security = ads
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workgroup = CUSTOMER
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realm = CUSTOMER.COM
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idmap config * : backend = autorid
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idmap config * : range = 1000000-1999999
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</programlisting>
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<para>
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This example shows how to configure idmap_autorid as default
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for all domains with a potentially large amount of users
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plus a specific configuration for a trusted domain
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that uses the SFU mapping scheme. Please note that idmap
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ranges and sfu ranges are not allowed to overlap.
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</para>
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<programlisting>
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[global]
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security = ads
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workgroup = CUSTOMER
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realm = CUSTOMER.COM
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idmap config * : backend = autorid
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idmap config * : range = 1000000-19999999
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idmap config * : rangesize = 1000000
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idmap config TRUSTED : backend = ad
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idmap config TRUSTED : range = 50000 - 99999
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idmap config TRUSTED : schema_mode = sfu
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</programlisting>
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</refsect1>
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<refsect1>
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<title>AUTHOR</title>
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<para>
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The original Samba software and related utilities
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were created by Andrew Tridgell. Samba is now developed
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by the Samba Team as an Open Source project similar
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to the way the Linux kernel is developed.
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</para>
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</refsect1>
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</refentry>
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