|IDMAP_RID(8)||System Administration tools||IDMAP_RID(8)|
idmap_rid - Samba's idmap_rid Backend for Winbind
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.
Currently, there should to be an explicit idmap configuration for each domain that should use the idmap_rid backend, using disjoint ranges.
NOTE: The idmap_rid backend can NOT bet used as the default backend. One usually needs to define a writeable default idmap range, using a backend like tdb or ldap 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.
range = low - high
base_rid = INTEGER
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.
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 config * : backend = tdb idmap config * : range = 1000000-1999999 idmap config MAIN : backend = rid idmap config MAIN : range = 10000 - 49999 idmap config TRUSTED : backend = rid idmap config TRUSTED : range = 50000 - 99999
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.