1IDMAP_AD(8) System Administration tools IDMAP_AD(8)
2
6 idmap_ad - Samba´s idmap_ad Backend for Winbind
7
9 The idmap_ad plugin provides a way for Winbind to read id mappings from
10 an AD server that uses RFC2307/SFU schema extensions. This module
11 implements only the "idmap" API, and is READONLY. Mappings must be
12 provided in advance by the administrator by adding the uidNumber
13 attributes for users and gidNumber attributes for groups in the AD.
14 Winbind will only map users that have a uidNumber and whose primary
15 group have a gidNumber attribute set. It is however recommended that
16 all groups in use have gidNumber attributes assigned, otherwise they
17 are not working.
18 Currently, the ad backend does not work as the default idmap backend,
20 but one has to configure it separately for each domain for which one
21 wants to use it, using disjoint ranges. One usually needs to configure
22 a writeable default idmap range, using for example the tdb or ldap
23 backend, in order to be able to map the BUILTIN sids and possibly other
24 trusted domains. The writeable default config is also needed in order
25 to be able to create group mappings. This catch-all default idmap
26 configuration should have a range that is disjoint from any explicitly
27 configured domain with idmap backend ad. See the example below.
28
30 range = low - high
31 Defines the available matching UID and GID range for which the
32 backend is authoritative. Note that the range acts as a filter. If
33 specified any UID or GID stored in AD that fall outside the range
34 is ignored and the corresponding map is discarded. It is intended
35 as a way to avoid accidental UID/GID overlaps between local and
36 remotely defined IDs.
37 schema_mode = <rfc2307 | sfu | sfu20>
39 Defines the schema that idmap_ad should use when querying Active
40 Directory regarding user and group information. This can be either
41 the RFC2307 schema support included in Windows 2003 R2 or the
42 Service for Unix (SFU) schema. For SFU 3.0 or 3.5 please choose
43 "sfu", for SFU 2.0 please choose "sfu20". Please note that primary
44 group membership is currently always calculated via the
45 "primaryGroupID" LDAP attribute.
46
48 The following example shows how to retrieve idmappings from our
49 principal and trusted AD domains. If trusted domains are present id
50 conflicts must be resolved beforehand, there is no guarantee on the
51 order conflicting mappings would be resolved at this point. This
52 example also shows how to leave a small non conflicting range for local
53 id allocation that may be used in internal backends like BUILTIN.
54 [global]
56 workgroup = CORP
57 idmap config * : backend = tdb
59 idmap config * : range = 1000000-1999999
60 idmap config CORP : backend = ad
62 idmap config CORP : range = 1000-999999
63
66 The original Samba software and related utilities were created by
67 Andrew Tridgell. Samba is now developed by the Samba Team as an Open
68 Source project similar to the way the Linux kernel is developed.
69Samba 4.2 06/19/2018 IDMAP_AD(8)