NAME

       idmap_ad - Samba's idmap_ad Backend for Winbind

DESCRIPTION

       The idmap_ad plugin provides a way for Winbind to read id mappings from an AD server that
       uses RFC2307/SFU schema extensions. This module implements only the "idmap" API, and is
       READONLY. Mappings must be provided in advance by the administrator by adding the
       uidNumber attributes for users and gidNumber attributes for groups in the AD. Winbind will
       only map users that have a uidNumber and whose primary group have a gidNumber attribute
       set. It is however recommended that all groups in use have gidNumber attributes assigned,
       otherwise they are not working.

       Currently, the ad backend does not work as the default idmap backend, but one has to
       configure it separately for each domain for which one wants to use it, using disjoint
       ranges. One usually needs to configure a writeable default idmap range, using for example
       the tdb or ldap backend, in order to be able to map the BUILTIN sids and possibly other
       trusted domains. The writeable default config is also needed in order to be able to create
       group mappings. This catch-all default idmap configuration should have a range that is
       disjoint from any explicitly configured domain with idmap backend ad. See the example
       below.

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 specified any UID or GID
           stored in AD that fall outside the range is 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.

       schema_mode = <rfc2307 | sfu | sfu20>
           Defines the schema that idmap_ad should use when querying Active Directory regarding
           user and group information. This can be either the RFC2307 schema support included in
           Windows 2003 R2 or the Service for Unix (SFU) schema. For SFU 3.0 or 3.5 please choose
           "sfu", for SFU 2.0 please choose "sfu20". Please note that primary group membership is
           currently always calculated via the "primaryGroupID" LDAP attribute.

EXAMPLES

       The following example shows how to retrieve idmappings from our principal and trusted AD
       domains. If trusted domains are present id conflicts must be resolved beforehand, there is
       no guarantee on the order conflicting mappings would be resolved at this point. This
       example also shows how to leave a small non conflicting range for local id allocation that
       may be used in internal backends like BUILTIN.

                [global]
                workgroup = CORP

                idmap config * : backend = tdb
                idmap config * : range = 1000000-1999999

                idmap config CORP : backend  = ad
                idmap config CORP : range = 1000-999999

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.