NAME
idmap_ldap - Samba's idmap_ldap Backend for Winbind
DESCRIPTION
The idmap_ldap plugin provides a means for Winbind to store and
retrieve SID/uid/gid mapping tables in an LDAP directory service.
In contrast to read only backends like idmap_rid, it is an allocating
backend: This means that it needs to allocate new user and group IDs in
order to create new mappings. The allocator can be provided by the
idmap_ldap backend itself or by any other allocating backend like
idmap_tdb or idmap_tdb2. This is configured with the parameter idmap
alloc backend.
Note that in order for this (or any other allocating) backend to
function at all, the default backend needs to be writeable. The ranges
used for uid and gid allocation are the default ranges configured by
"idmap uid" and "idmap gid".
Furthermore, since there is only one global allocating backend
responsible for all domains using writeable idmap backends, any
explicitly configured domain with idmap backend ldap should have the
same range as the default range, since it needs to use the global uid /
gid allocator. See the example below.
IDMAP OPTIONS
ldap_base_dn = DN
Defines the directory base suffix to use when searching for
SID/uid/gid mapping entries. If not defined, idmap_ldap will
default to using the "ldap idmap suffix" option from smb.conf.
ldap_user_dn = DN
Defines the user DN to be used for authentication. If absent an
anonymous bind will be performed.
ldap_url = ldap://server/
Specifies the LDAP server to use when searching for existing
SID/uid/gid map entries. If not defined, idmap_ldap will assume
that ldap://localhost/ should be used.
range = low - high
Defines the available matching uid and gid range for which the
backend is authoritative. If the parameter is absent, Winbind fails
over to use the "idmap uid" and "idmap gid" options from smb.conf.
IDMAP ALLOC OPTIONS
ldap_base_dn = DN
Defines the directory base suffix under which new SID/uid/gid
mapping entries should be stored. If not defined, idmap_ldap will
default to using the "ldap idmap suffix" option from smb.conf.
ldap_user_dn = DN
Defines the user DN to be used for authentication. If absent an
anonymous bind will be performed.
ldap_url = ldap://server/
Specifies the LDAP server to which modify/add/delete requests
should be sent. If not defined, idmap_ldap will assume that
ldap://localhost/ should be used.
EXAMPLES
The follow sets of a LDAP configuration which uses two LDAP
directories, one for storing the ID mappings and one for retrieving new
IDs.
[global]
idmap backend = ldap:ldap://localhost/
idmap uid = 1000000-1999999
idmap gid = 1000000-1999999
idmap alloc backend = ldap
idmap alloc config : ldap_url = ldap://id-master/
idmap alloc config : ldap_base_dn = ou=idmap,dc=example,dc=com
NOTE
In order to use authentication against ldap servers you may need to
provide a DN and a password. To avoid exposing the password in plain
text in the configuration file we store it into a security store. The
"net idmap " command is used to store a secret for the DN specified in
a specific idmap domain.
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.