SLAPD.OVERLAYS(5) File Formats Manual SLAPD.OVERLAYS(5)
NAME
slapd.overlays - overlays for slapd, the stand-alone LDAP daemon
DESCRIPTION
The slapd(8) daemon can use a variety of different overlays to alter or
extend the normal behavior of a database backend. Overlays may be com-
piled statically into slapd, or when module support is enabled, they
may be dynamically loaded. Most of the overlays are only allowed to be
configured on individual databases, but some may also be configured
globally.
Configuration options for each overlay are documented separately in the
corresponding slapo-<overlay>(5) manual pages.
accesslog
Access Logging. This overlay can record accesses to a given
backend database on another database.
auditlog
Audit Logging. This overlay records changes on a given backend
database to an LDIF log file. By default it is not built.
autoca Automatic Certificate Authority overlay. This overlay can gen-
erate X.509 certificate/key pairs for entries in the directory
if slapd is linked to OpenSSL. By default it is not built.
chain Chaining. This overlay allows automatic referral chasing when a
referral would have been returned, either when configured by the
server or when requested by the client.
collect
Collective Attributes. This overlay implements RFC 3671 collec-
tive attributes; these attributes share common values over all
the members of the collection as inherited from an ancestor en-
try.
constraint
Constraint. This overlay enforces a regular expression con-
straint on all values of specified attributes. It is used to en-
force a more rigorous syntax when the underlying attribute syn-
tax is too general.
dds Dynamic Directory Services. This overlay supports dynamic ob-
jects, which have a limited life after which they expire and are
automatically deleted.
deref Dereference Control. This overlay implements the draft Derefer-
ence control. The overlay can be used with any backend or glob-
ally for all backends.
dyngroup
Dynamic Group. This is a demo overlay which extends the Compare
operation to detect members of a dynamic group. It has no ef-
fect on any other operations.
dynlist
Dynamic List. This overlay allows expansion of dynamic groups
and more.
homedir
Home Directory Provisioning. This overlay manages cre-
ation/deletion of home directories for LDAP-based Unix accounts.
memberof
MemberOf. This overlay maintains automatic reverse group mem-
bership values, typically stored in an attribute called mem-
berOf. This overlay is deprecated and should be replaced with
dynlist.
otp OATH One-Time Password module. This module allows time-based
one-time password, AKA "authenticator-style", and HMAC-based
one-time password authentication to be used in conjunction with
a standard LDAP password for two factor authentication.
pbind Proxybind. This overlay forwards simple bind requests on a lo-
cal database to a remote LDAP server.
pcache Proxycache. This overlay allows caching of LDAP search requests
in a local database. It is most often used with the
slapd-ldap(5) or slapd-meta(5) backends.
ppolicy
Password Policy. This overlay provides a variety of password
control mechanisms, e.g. password aging, password reuse and du-
plication control, mandatory password resets, etc.
refint Referential Integrity. This overlay can be used with a backend
database such as slapd-mdb(5) to maintain the cohesiveness of a
schema which utilizes reference attributes.
remoteauth
Remote Authentication. This overlay delegates authentication
requests to remote directories.
retcode
Return Code. This overlay is useful to test the behavior of
clients when server-generated erroneous and/or unusual responses
occur.
rwm Rewrite/remap. This overlay is experimental. It performs basic
DN/data rewrite and objectClass/attributeType mapping.
sssvlv Server Side Sorting and Virtual List Views. This overlay imple-
ments the RFC2891 server-side sorting control and virtual list
view controls, and replaces the RFC2696 paged-results implemen-
tation to ensure it works with the sorting technique.
syncprov
Syncrepl Provider. This overlay implements the provider-side
support for syncrepl replication, including persistent search
functionality.
translucent
Translucent Proxy. This overlay can be used with a backend
database such as slapd-mdb(5) to create a "translucent proxy".
Content of entries retrieved from a remote LDAP server can be
partially overridden by the database.
unique Attribute Uniqueness. This overlay can be used with a backend
database such as slapd-mdb(5) to enforce the uniqueness of some
or all attributes within a subtree.
valsort
Value Sorting. This overlay can be used to enforce a specific
order for the values of an attribute when it is returned in a
search.
FILES
/etc/ldap/slapd.conf
default slapd configuration file
/etc/ldap/slapd.d
default slapd configuration directory
SEE ALSO
ldap(3), slapo-accesslog(5), slapo-auditlog(5), slapo-autoca(5),
slapo-chain(5), slapo-collect(5), slapo-constraint(5), slapo-dds(5),
slapo-deref(5), slapo-dyngroup(5), slapo-dynlist(5), slapo-memberof(5),
slapo-pbind(5), slapo-pcache(5), slapo-ppolicy(5), slapo-refint(5),
slapo-remoteauth(5), slapo-retcode(5), slapo-rwm(5), slapo-sssvlv(5),
slapo-syncprov(5), slapo-translucent(5), slapo-unique(5). slapo-val-
sort(5). slapd-config(5), slapd.conf(5), slapd.backends(5), slapd(8).
"OpenLDAP Administrator's Guide" (http://www.OpenLDAP.org/doc/admin/)
ACKNOWLEDGEMENTS
OpenLDAP Software is developed and maintained by The OpenLDAP Project
<http://www.openldap.org/>. OpenLDAP Software is derived from the Uni-
versity of Michigan LDAP 3.3 Release.
OpenLDAP 2.5.13+dfsg-5 2022/07/14 SLAPD.OVERLAYS(5)
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