1<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 V1.74.0"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry" lang="en"><a name="idmap_rid.8"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>idmap_rid — Samba's idmap_rid Backend for Winbind</p></div><div class="refsynopsisdiv"><h2>DESCRIPTION</h2><p>The idmap_rid backend provides a way to use an algorithmic 2 mapping scheme to map UIDs/GIDs and SIDs. No database is required 3 in this case as the mapping is deterministic.</p></div><div class="refsect1" lang="en"><a name="id2522909"></a><h2>IDMAP OPTIONS</h2><div class="variablelist"><dl><dt><span class="term">range = low - high</span></dt><dd><p> 4 Defines the available matching uid and gid range for which the 5 backend is authoritative. Note that the range acts as a filter. 6 If algorithmically determined UID or GID fall outside the 7 range, they are ignored and the corresponding map is discarded. 8 It is intended as a way to avoid accidental UID/GID overlaps 9 between local and remotely defined IDs. 10 </p></dd><dt><span class="term">base_rid = INTEGER</span></dt><dd><p> 11 Defines the base integer used to build SIDs out of a UID or a GID, 12 and to rebase the UID or GID to be obtained from a SID. 13 This means SIDs with a RID less than the base rid are filtered. 14 The default is not to restrict the allowed rids at all, 15 i.e. a base_rid value of 0. 16 A good value for the base_rid can be 1000, since user 17 RIDs by default start at 1000 (512 hexadecimal). 18 </p><p> 19 Use of this parameter is deprecated. 20 </p></dd></dl></div></div><div class="refsect1" lang="en"><a name="id2483331"></a><h2>THE MAPPING FORMULAS</h2><p> 21 The Unix ID for a RID is calculated this way: 22 </p><pre class="programlisting"> 23 ID = RID - BASE_RID + LOW_RANGE_ID. 24 </pre><p> 25 </p><p> 26 Correspondingly, the formula for calculating the RID for a 27 given Unix ID is this: 28 </p><pre class="programlisting"> 29 RID = ID + BASE_RID - LOW_RANGE_ID. 30 </pre><p> 31 </p></div><div class="refsect1" lang="en"><a name="id2483358"></a><h2>EXAMPLES</h2><p> 32 This example shows how to configure two domains with idmap_rid, 33 the principal domain and a trusted domain, leaving the default 34 id mapping scheme at tdb. The example also demonstrates the use 35 of the base_rid parameter for the trusted domain. 36 </p><pre class="programlisting"> 37 [global] 38 security = domain 39 workgroup = MAIN 40 41 idmap backend = tdb 42 idmap uid = 1000000-1999999 43 idmap gid = 1000000-1999999 44 45 idmap config MAIN : backend = rid 46 idmap config MAIN : range = 10000 - 49999 47 48 idmap config TRUSTED : backend = rid 49 idmap config TRUSTED : range = 50000 - 99999 50 idmap config TRUSTED : base_rid = 1000 51 </pre></div><div class="refsect1" lang="en"><a name="id2483384"></a><h2>AUTHOR</h2><p> 52 The original Samba software and related utilities 53 were created by Andrew Tridgell. Samba is now developed 54 by the Samba Team as an Open Source project similar 55 to the way the Linux kernel is developed. 56 </p></div></div></body></html> 57