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NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | AUTHOR | COLOPHON |
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SLAPO-CHAIN(5) File Formats Manual SLAPO-CHAIN(5)
slapo-chain - chain overlay to slapd
ETCDIR/slapd.conf
The chain overlay to slapd(8) allows automatic referral chasing.
Any time a referral is returned (except for bind operations), it
is chased by using an instance of the ldap backend. If operations
are performed with an identity (i.e. after a bind), that identity
can be asserted while chasing the referrals by means of the
identity assertion feature of back-ldap (see slapd-ldap(5) for
details), which is essentially based on the proxied authorization
control [RFC 4370]. Referral chasing can be controlled by the
client by issuing the chaining control (see draft-sermersheim-
ldap-chaining for details.)
The config directives that are specific to the chain overlay are
prefixed by chain-, to avoid potential conflicts with directives
specific to the underlying database or to other stacked overlays.
There are very few chain overlay specific directives; however,
directives related to the instances of the ldap backend that may
be implicitly instantiated by the overlay may assume a special
meaning when used in conjunction with this overlay. They are
described in slapd-ldap(5), and they also need to be prefixed by
chain-.
Note: this overlay is built into the ldap backend; it is not a
separate module.
overlay chain
This directive adds the chain overlay to the current
backend. The chain overlay may be used with any backend,
but it is mainly intended for use with local storage
backends that may return referrals. It is useless in
conjunction with the slapd-ldap and slapd-meta backends
because they already exploit the libldap specific referral
chase feature. [Note: this may change in the future, as
the ldap(5) and meta(5) backends might no longer chase
referrals on their own.]
chain-cache-uri {FALSE|true}
This directive instructs the chain overlay to cache
connections to URIs parsed out of referrals that are not
predefined, to be reused for later chaining. These URIs
inherit the properties configured for the underlying
slapd-ldap(5) before any occurrence of the chain-uri
directive; basically, they are chained anonymously.
chain-chaining [resolve=<r>] [continuation=<c>] [critical]
This directive enables the chaining control (see draft-
sermersheim-ldap-chaining for details) with the desired
resolve and continuation behaviors and criticality. The
resolve parameter refers to the behavior while discovering
a resource, namely when accessing the object indicated by
the request DN; the continuation parameter refers to the
behavior while handling intermediate responses, which is
mostly significant for the search operation, but may affect
extended operations that return intermediate responses.
The values r and c can be any of chainingPreferred,
chainingRequired, referralsPreferred, referralsRequired.
If the critical flag affects the control criticality if
provided. [This control is experimental and its support
may change in the future.]
chain-max-depth <n>
In case a referral is returned during referral chasing,
further chasing occurs at most <n> levels deep. Set to 1
(the default) to disable further referral chasing.
chain-return-error {FALSE|true}
In case referral chasing fails, the real error is returned
instead of the original referral. In case multiple
referral URIs are present, only the first error is
returned. This behavior may not be always appropriate nor
desirable, since failures in referral chasing might be
better resolved by the client (e.g. when caused by
distributed authentication issues).
chain-uri <ldapuri>
This directive instantiates a new underlying ldap database
and instructs it about which URI to contact to chase
referrals. As opposed to what stated in slapd-ldap(5),
only one URI can appear after this directive; all
subsequent slapd-ldap(5) directives prefixed by chain-
refer to this specific instance of a remote server.
Directives for configuring the underlying ldap database may also
be required, as shown in this example:
overlay chain
chain-rebind-as-user FALSE
chain-uri "ldap://ldap1.example.com"
chain-rebind-as-user TRUE
chain-idassert-bind bindmethod="simple"
binddn="cn=Auth,dc=example,dc=com"
credentials="secret"
mode="self"
chain-uri "ldap://ldap2.example.com"
chain-idassert-bind bindmethod="simple"
binddn="cn=Auth,dc=example,dc=com"
credentials="secret"
mode="none"
Any valid directives for the ldap database may be used; see
slapd-ldap(5) for details. Multiple occurrences of the chain-uri
directive may appear, to define multiple "trusted" URIs where
operations with identity assertion are chained. All URIs not
listed in the configuration are chained anonymously. All
slapd-ldap(5) directives appearing before the first occurrence of
chain-uri are inherited by all URIs, unless specifically
overridden inside each URI configuration.
ETCDIR/slapd.conf
default slapd configuration file
slapd.conf(5), slapd-config(5), slapd-ldap(5), slapd(8).
Originally implemented by Howard Chu; extended by Pierangelo
Masarati.
This page is part of the OpenLDAP (an open source implementation
of the Lightweight Directory Access Protocol) project.
Information about the project can be found at
⟨http://www.openldap.org/⟩. If you have a bug report for this
manual page, see ⟨http://www.openldap.org/its/⟩. This page was
obtained from the project's upstream Git repository
⟨https://git.openldap.org/openldap/openldap.git⟩ on 2025-08-11.
(At that time, the date of the most recent commit that was found
in the repository was 2025-08-05.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
OpenLDAP LDVERSION RELEASEDATE SLAPO-CHAIN(5)
Pages that refer to this page: slapd-ldap(5), slapd.overlays(5), slapo-ppolicy(5)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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