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IDMAP_RID

IDMAP_RID

Section: System Administration tools (8) Updated: 03/06/2011
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NAME

idmap_rid - Samba's idmap_rid Backend for Winbind  

DESCRIPTION

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.  

IDMAP OPTIONS

range = low - high

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.

base_rid = INTEGER

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).

Use of this parameter is deprecated.

 

THE MAPPING FORMULAS

The Unix ID for a RID is calculated this way:

                        ID = RID - BASE_RID + LOW_RANGE_ID.
                

Correspondingly, the formula for calculating the RID for a given Unix ID is this:

                        RID = ID + BASE_RID - LOW_RANGE_ID.
                

 

EXAMPLES

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.

        [global]
        security = domain
        workgroup = MAIN

        idmap backend = tdb
        idmap uid = 1000000-1999999
        idmap gid = 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
        
 

AUTHOR

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.


 

Index

NAME
DESCRIPTION
IDMAP OPTIONS
THE MAPPING FORMULAS
EXAMPLES
AUTHOR

This document was created by man2html, using the manual pages.
Time: 22:01:46 GMT, April 16, 2011