IDMAP_RFC2307(8) System Administration tools IDMAP_RFC2307(8)
idmap_rfc2307 - Samba's idmap_rfc2307 Backend for Winbind
The idmap_rfc2307 plugin provides a way for winbind to read id mappings
from records in an LDAP server as defined in RFC 2307. The LDAP server
can be stand-alone or the LDAP server provided by the AD server. An AD
server is always required to provide the mapping between name and SID,
and the LDAP server is queried for the mapping between name and
uid/gid. This module implements only the "idmap" API, and is READONLY.
Mappings must be provided in advance by the administrator by creating
the user accounts in the Active Directory server and the posixAccount
and posixGroup objects in the LDAP server. The names in the Active
Directory server and in the LDAP server have to be the same.
This id mapping approach allows the reuse of existing LDAP
authentication servers that store records in the RFC 2307 format.
When connecting to the LDAP server provided by an AD server, the
parameter ldap ssl ads determines whether SSL should be used. When
using a stand-alone LDAP server, ldap ssl applies.
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.
ldap_server = <ad | stand-alone >
Defines the type of LDAP server to use. This can either be the LDAP
server provided by the Active Directory server (ad) or a
stand-alone LDAP server.
Specifies the search base where user objects can be found in the
Specifies the search base where group objects can be found in the
user_cn = <yes | no>
Query cn attribute instead of uid attribute for the user name in
LDAP. This option is not required, the default is no.
Append @realm to cn for groups (and users if user_cn is set) in
LDAP queries. This option is not required, the default is not to
append the realm.
When using the LDAP server in the Active Directory server, this
allows one to specify the domain where to access the Active
Directory server. This allows using trust relationships while
keeping all RFC 2307 records in one place. This parameter is
optional, the default is to access the AD server in the current
domain to query LDAP records.
When using a stand-alone LDAP server, this parameter specifies the
ldap URL for accessing the LDAP server.
Defines the user DN to be used for authentication. The secret for
authenticating this user should be stored with net idmap secret
(see net(8)). If absent, an anonymous bind will be performed.
The following example shows how to retrieve id mappings from a
stand-alone LDAP server. 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.
idmap config * : backend = tdb
idmap config * : range = 1000000-1999999
idmap config DOMAIN : backend = rfc2307
idmap config DOMAIN : range = 2000000-2999999
idmap config DOMAIN : ldap_server = stand-alone
idmap config DOMAIN : ldap_url = ldap://ldap1.example.com
idmap config DOMAIN : ldap_user_dn = cn=ldapmanager,dc=example,dc=com
idmap config DOMAIN : bind_path_user = ou=People,dc=example,dc=com
idmap config DOMAIN : bind_path_group = ou=Group,dc=example,dc=com
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.
Samba 4.7 12/13/2021 IDMAP_RFC2307(8)
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