1<?xml version="1.0" encoding="iso-8859-1"?> 2<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc"> 3<refentry id="idmap_rid.8"> 4 5<refmeta> 6 <refentrytitle>idmap_rid</refentrytitle> 7 <manvolnum>8</manvolnum> 8 <refmiscinfo class="source">Samba</refmiscinfo> 9 <refmiscinfo class="manual">System Administration tools</refmiscinfo> 10 <refmiscinfo class="version">3.5</refmiscinfo> 11</refmeta> 12 13 14<refnamediv> 15 <refname>idmap_rid</refname> 16 <refpurpose>Samba's idmap_rid Backend for Winbind</refpurpose> 17</refnamediv> 18 19<refsynopsisdiv> 20 <title>DESCRIPTION</title> 21 <para>The idmap_rid backend provides a way to use an algorithmic 22 mapping scheme to map UIDs/GIDs and SIDs. No database is required 23 in this case as the mapping is deterministic.</para> 24</refsynopsisdiv> 25 26<refsect1> 27 <title>IDMAP OPTIONS</title> 28 29 <variablelist> 30 <varlistentry> 31 <term>range = low - high</term> 32 <listitem><para> 33 Defines the available matching uid and gid range for which the 34 backend is authoritative. Note that the range acts as a filter. 35 If algorithmically determined UID or GID fall outside the 36 range, they are ignored and the corresponding map is discarded. 37 It is intended as a way to avoid accidental UID/GID overlaps 38 between local and remotely defined IDs. 39 </para></listitem> 40 </varlistentry> 41 42 <varlistentry> 43 <term>base_rid = INTEGER</term> 44 <listitem><para> 45 Defines the base integer used to build SIDs out of a UID or a GID, 46 and to rebase the UID or GID to be obtained from a SID. 47 This means SIDs with a RID less than the base rid are filtered. 48 The default is not to restrict the allowed rids at all, 49 i.e. a base_rid value of 0. 50 A good value for the base_rid can be 1000, since user 51 RIDs by default start at 1000 (512 hexadecimal). 52 </para> 53 <para> 54 Use of this parameter is deprecated. 55 </para></listitem> 56 </varlistentry> 57 </variablelist> 58</refsect1> 59 60<refsect1> 61 <title>THE MAPPING FORMULAS</title> 62 <para> 63 The Unix ID for a RID is calculated this way: 64 <programlisting> 65 ID = RID - BASE_RID + LOW_RANGE_ID. 66 </programlisting> 67 </para> 68 <para> 69 Correspondingly, the formula for calculating the RID for a 70 given Unix ID is this: 71 <programlisting> 72 RID = ID + BASE_RID - LOW_RANGE_ID. 73 </programlisting> 74 </para> 75</refsect1> 76 77<refsect1> 78 <title>EXAMPLES</title> 79 <para> 80 This example shows how to configure two domains with idmap_rid, 81 the principal domain and a trusted domain, leaving the default 82 id mapping scheme at tdb. The example also demonstrates the use 83 of the base_rid parameter for the trusted domain. 84 </para> 85 86 <programlisting> 87 [global] 88 security = domain 89 workgroup = MAIN 90 91 idmap backend = tdb 92 idmap uid = 1000000-1999999 93 idmap gid = 1000000-1999999 94 95 idmap config MAIN : backend = rid 96 idmap config MAIN : range = 10000 - 49999 97 98 idmap config TRUSTED : backend = rid 99 idmap config TRUSTED : range = 50000 - 99999 100 idmap config TRUSTED : base_rid = 1000 101 </programlisting> 102</refsect1> 103 104<refsect1> 105 <title>AUTHOR</title> 106 107 <para> 108 The original Samba software and related utilities 109 were created by Andrew Tridgell. Samba is now developed 110 by the Samba Team as an Open Source project similar 111 to the way the Linux kernel is developed. 112 </para> 113</refsect1> 114 115</refentry> 116