IDMAP_RID(8)                                       System Administration tools                                      IDMAP_RID(8)



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.



Samba 3.5                                                  08/02/2011                                               IDMAP_RID(8)