SLAPO-CHAIN(5)

NAME
slapo-chain - chain overlay

SYNOPSIS
/etc/openldap/slapd.conf

DESCRIPTION
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 proxyAuthz control (see draft-weltman-ldapv3-proxy for details).

The config directives that are specific to the chain overlay can be prefixed by chain-, to avoid potential conflicts with directives specific to the underlying database or to other stacked overlays.

There are no chain overlay specific directives; however, directives related to the ldap database that is implicitly instantiated by the overlay may assume a special meaning when used in conjunction with this overlay. They are described in slapd-ldap(5).

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 ldap and meta backends because they already exploit the libldap specific referral chase feature.

chain-uri <ldapuri>
    This directive instructs the underlying ldap database about which URI to contact to chase referrals. If not present, the referral itself is parsed, and the protocol/host/port portions are used to establish a connection.

Directives for configuring the underlying ldap database may also be required, as shown here:

    chain-idassert-method	"simple"
    chain-idassert-authcDN	"cn=Auth,dc=example,dc=com"
    chain-idassert-passwd	"secret"
    chain-idassert-mode	"self"

Any valid directives for the ldap database may be used; see slapd-ldap(5) for details.

FILES

/etc/openldap/slapd.conf
    default slapd configuration file

SEE ALSO
slapd.conf(5), slapd-ldap(5), slapd(8).

AUTHOR
Originally implemented by Howard Chu.