| 1 | '\" t
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| 2 | .\" Title: idmap_rid
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| 3 | .\" Author: [see the "AUTHOR" section]
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| 4 | .\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
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| 5 | .\" Date: 10/25/2016
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| 6 | .\" Manual: System Administration tools
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| 7 | .\" Source: Samba 4.4
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| 8 | .\" Language: English
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| 9 | .\"
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| 10 | .TH "IDMAP_RID" "8" "10/25/2016" "Samba 4\&.4" "System Administration tools"
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| 11 | .\" -----------------------------------------------------------------
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| 12 | .\" * Define some portability stuff
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| 13 | .\" -----------------------------------------------------------------
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| 14 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 15 | .\" http://bugs.debian.org/507673
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| 16 | .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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| 17 | .\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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| 18 | .ie \n(.g .ds Aq \(aq
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| 19 | .el .ds Aq '
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| 20 | .\" -----------------------------------------------------------------
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| 21 | .\" * set default formatting
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| 22 | .\" -----------------------------------------------------------------
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| 23 | .\" disable hyphenation
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| 24 | .nh
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| 25 | .\" disable justification (adjust text to left margin only)
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| 26 | .ad l
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| 27 | .\" -----------------------------------------------------------------
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| 28 | .\" * MAIN CONTENT STARTS HERE *
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| 29 | .\" -----------------------------------------------------------------
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| 30 | .SH "NAME"
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| 31 | idmap_rid \- Samba\*(Aqs idmap_rid Backend for Winbind
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| 32 | .SH "DESCRIPTION"
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| 33 | .PP
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| 34 | 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\&.
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| 35 | .PP
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| 36 | 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 backend like
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| 37 | \fItdb\fR
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| 38 | or
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| 39 | \fIldap\fR
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| 40 | 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\&.
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| 41 | .PP
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| 42 | Note that the old syntax
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| 43 | \fIidmap backend = rid:"DOM1=range DOM2=range2 \&.\&.\&."\fR
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| 44 | is not supported any more since Samba version 3\&.0\&.25\&.
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| 45 | .SH "IDMAP OPTIONS"
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| 46 | .PP
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| 47 | range = low \- high
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| 48 | .RS 4
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| 49 | 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\&.
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| 50 | .RE
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| 51 | .PP
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| 52 | base_rid = INTEGER
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| 53 | .RS 4
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| 54 | 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\&.
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| 55 | .sp
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| 56 | Use of this parameter is deprecated\&.
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| 57 | .RE
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| 58 | .SH "THE MAPPING FORMULAS"
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| 59 | .PP
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| 60 | The Unix ID for a RID is calculated this way:
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| 61 | .sp
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| 62 | .if n \{\
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| 63 | .RS 4
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| 64 | .\}
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| 65 | .nf
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| 66 | ID = RID \- BASE_RID + LOW_RANGE_ID\&.
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| 67 |
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| 68 | .fi
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| 69 | .if n \{\
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| 70 | .RE
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| 71 | .\}
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| 72 | .PP
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| 73 | Correspondingly, the formula for calculating the RID for a given Unix ID is this:
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| 74 | .sp
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| 75 | .if n \{\
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| 76 | .RS 4
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| 77 | .\}
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| 78 | .nf
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| 79 | RID = ID + BASE_RID \- LOW_RANGE_ID\&.
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| 80 |
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| 81 | .fi
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| 82 | .if n \{\
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| 83 | .RE
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| 84 | .\}
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| 85 | .sp
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| 86 | .SH "EXAMPLES"
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| 87 | .PP
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| 88 | 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\&.
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| 89 | .sp
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| 90 | .if n \{\
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| 91 | .RS 4
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| 92 | .\}
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| 93 | .nf
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| 94 | [global]
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| 95 | security = domain
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| 96 | workgroup = MAIN
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| 97 |
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| 98 | idmap config * : backend = tdb
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| 99 | idmap config * : range = 1000000\-1999999
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| 100 |
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| 101 | idmap config MAIN : backend = rid
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| 102 | idmap config MAIN : range = 10000 \- 49999
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| 103 |
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| 104 | idmap config TRUSTED : backend = rid
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| 105 | idmap config TRUSTED : range = 50000 \- 99999
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| 106 |
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| 107 | .fi
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| 108 | .if n \{\
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| 109 | .RE
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| 110 | .\}
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| 111 | .SH "AUTHOR"
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| 112 | .PP
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| 113 | 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\&.
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