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-<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>idmap_rid</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" title="idmap_rid"><a name="idmap_rid.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>idmap_rid &#8212; Samba's idmap_rid Backend for Winbind</p></div><div class="refsynopsisdiv" title="DESCRIPTION"><h2>DESCRIPTION</h2><p>The idmap_rid backend provides a way to use an algorithmic
- mapping scheme to map UIDs/GIDs and SIDs. No database is required
- in this case as the mapping is deterministic.</p><p>
- Note that the idmap_rid module has changed considerably since Samba
- versions 3.0. and 3.2.
- Currently, there should to be an explicit idmap configuration for each
- domain that should use the idmap_rid backend, using disjoint ranges.
- One usually needs to define a writeable default idmap range, using
- a backent like <em class="parameter"><code>tdb</code></em> or <em class="parameter"><code>ldap</code></em>
- that can create unix ids, in order to be able to map the BUILTIN sids
- and other domains, and also in order to be able to create group mappings.
- See the example below.
- </p><p>
- Note that the old syntax
- <em class="parameter"><code>idmap backend = rid:"DOM1=range DOM2=range2 ..."</code></em>
- is not supported any more since Samba version 3.0.25.
- </p></div><div class="refsect1" title="IDMAP OPTIONS"><a name="id266822"></a><h2>IDMAP OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">range = low - high</span></dt><dd><p>
- Defines the available matching uid and gid range for which the
- backend is authoritative. Note that the range acts as a filter.
- If algorithmically determined UID or GID fall outside the
- range, they are ignored and the corresponding map is discarded.
- It is intended as a way to avoid accidental UID/GID overlaps
- between local and remotely defined IDs.
- </p></dd><dt><span class="term">base_rid = INTEGER</span></dt><dd><p>
- Defines the base integer used to build SIDs out of a UID or a GID,
- and to rebase the UID or GID to be obtained from a SID.
- This means SIDs with a RID less than the base rid are filtered.
- The default is not to restrict the allowed rids at all,
- i.e. a base_rid value of 0.
- A good value for the base_rid can be 1000, since user
- RIDs by default start at 1000 (512 hexadecimal).
- </p><p>
- Use of this parameter is deprecated.
- </p></dd></dl></div></div><div class="refsect1" title="THE MAPPING FORMULAS"><a name="id266864"></a><h2>THE MAPPING FORMULAS</h2><p>
- The Unix ID for a RID is calculated this way:
- </p><pre class="programlisting">
- ID = RID - BASE_RID + LOW_RANGE_ID.
- </pre><p>
- </p><p>
- Correspondingly, the formula for calculating the RID for a
- given Unix ID is this:
- </p><pre class="programlisting">
- RID = ID + BASE_RID - LOW_RANGE_ID.
- </pre><p>
- </p></div><div class="refsect1" title="EXAMPLES"><a name="id266889"></a><h2>EXAMPLES</h2><p>
- This example shows how to configure two domains with idmap_rid,
- the principal domain and a trusted domain, leaving the default
- id mapping scheme at tdb. The example also demonstrates the use
- of the base_rid parameter for the trusted domain.
- </p><pre class="programlisting">
- [global]
- security = domain
- workgroup = MAIN
-
- idmap config * : backend = tdb
- idmap config * : range = 1000000-1999999
-
- idmap config MAIN : backend = rid
- idmap config MAIN : range = 10000 - 49999
-
- idmap config TRUSTED : backend = rid
- idmap config TRUSTED : range = 50000 - 99999
- idmap config TRUSTED : base_rid = 1000
- </pre></div><div class="refsect1" title="AUTHOR"><a name="id265706"></a><h2>AUTHOR</h2><p>
- The original Samba software and related utilities
- were created by Andrew Tridgell. Samba is now developed
- by the Samba Team as an Open Source project similar
- to the way the Linux kernel is developed.
- </p></div></div></body></html>