idmap_ad - Samba's idmap_ad Backend for Winbind
Please see following description for synopsis
System Administration tools IDMAP_AD(8)
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 the
behavior of primary group membership is controlled by the
unix_primary_group option.
unix_primary_group = yes/no
Defines whether the user's primary group is fetched from the SFU
attributes or the AD primary group. If set to yes the primary group
membership is fetched from the LDAP attributes (gidNumber). If set
to no the primary group membership is calculated via the
"primaryGroupID" LDAP attribute.
Default: no
unix_nss_info = yes/no
If set to yes winbind will retrieve the login shell and home
directory from the LDAP attributes. If set to no or the AD LDAP
entry lacks the SFU attributes the options template shell and
template homedir are used.
Default: no
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.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+-----------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+-----------------------+
|Availability | service/network/samba |
+---------------+-----------------------+
|Stability | Volatile |
+---------------+-----------------------+
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from
https://download.samba.org/pub/samba/stable/samba-4.13.17.tar.gz.
Further information about this software can be found on the open source
community website at http://www.samba.org/.
Samba 4.13.17 06/28/2022 IDMAP_AD(8)