1IDMAP_AD(8) System Administration tools IDMAP_AD(8)
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6 idmap_ad - Samba's idmap_ad Backend for Winbind
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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.
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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 the
44 behavior of primary group membership is controlled by the
45 unix_primary_group option.
46 unix_primary_group = yes/no
48 Defines whether the user's primary group is fetched from the SFU
49 attributes or the AD primary group. If set to yes the primary group
50 membership is fetched from the LDAP attributes (gidNumber). If set
51 to no the primary group membership is calculated via the
52 "primaryGroupID" LDAP attribute.
53 Default: no
55 unix_nss_info = yes/no
57 If set to yes winbind will retrieve the login shell and home
58 directory from the LDAP attributes. If set to no or the AD LDAP
59 entry lacks the SFU attributes the options template shell and
60 template homedir are used.
61 Default: no
63 deny ous
65 This parameter is a list of OUs from which objects will not be
66 mapped via the ad idmap module. If deny ous is set but allow ous is
67 not set, every object outside the OUs listed in deny ous is
68 allowed.
69 Default: none
71 allow ous
73 This parameter is a list of OUs from which objects will be mapped
74 via the ad idmap module. If allow ous is set but deny ous is not
75 set, every object outside the OUs allow ous is denied.
76 If both allow ous and deny ous are set, deny ous is evaluated
78 first, then allow ous is looked at. If an AD object matches
79 neither, it is denied.
80 Default: none
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84 The following example shows how to retrieve idmappings from our
85 principal and trusted AD domains. If trusted domains are present id
86 conflicts must be resolved beforehand, there is no guarantee on the
87 order conflicting mappings would be resolved at this point. This
88 example also shows how to leave a small non conflicting range for local
89 id allocation that may be used in internal backends like BUILTIN.
90 [global]
92 workgroup = CORP
93 idmap config * : backend = tdb
95 idmap config * : range = 1000000-1999999
96 idmap config CORP : backend = ad
98 idmap config CORP : range = 1000-999999
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102 The original Samba software and related utilities were created by
103 Andrew Tridgell. Samba is now developed by the Samba Team as an Open
104 Source project similar to the way the Linux kernel is developed.
105Samba 4.19.3 11/27/2023 IDMAP_AD(8)