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NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION | EXAMPLES | FILES | SEE ALSO | ACKNOWLEDGEMENTS | COLOPHON |
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SLAPO-CONSTRAINT(5) File Formats Manual SLAPO-CONSTRAINT(5)
slapo-constraint - Attribute Constraint Overlay to slapd
ETCDIR/slapd.conf
The constraint overlay is used to ensure that attribute values
match some constraints beyond basic LDAP syntax. Attributes can
have multiple constraints placed upon them, and all must be
satisfied when modifying an attribute value under constraint.
This overlay is intended to be used to force syntactic regularity
upon certain string represented data which have well known
canonical forms, like telephone numbers, post codes, FQDNs, etc.
It constrains only LDAP add, modify and rename commands and only
seeks to control the add and replace values of modify and rename
requests.
No constraints are applied for operations performed with the relax
control set.
These slapd.conf options apply to the constraint overlay. They
should appear after the overlay directive.
constraint_attribute <attribute_name>[,...] <type> <value>
[<extra> [...]]
Specifies the constraint which should apply to the comma-
separated attribute list named as the first parameter.
Eight types of constraint are currently supported - regex,
negregex, size, count, uri, neguri, set, and negset.
The parameter following the regex or negregex type is a
Unix style regular expression (See regex(7) ). The
parameter following the uri or neguri type is an LDAP URI.
The URI will be evaluated using an internal search. It
must not include a hostname, and it must include a list of
attributes to evaluate.
The parameter following the set or negset type is a string
that is interpreted according to the syntax in use for ACL
sets. This allows one to construct constraints based on
the contents of the entry.
The size type can be used to enforce a limit on an
attribute length, and the count type limits the number of
values of an attribute.
Extra parameters can occur in any order after those
described above.
<extra> : restrict=<uri>
This extra parameter allows one to restrict the application
of the corresponding constraint only to entries that match
the base, scope and filter portions of the LDAP URI. The
base, if present, must be within the naming context of the
database. The scope is only used when the base is present;
it defaults to base. The other parameters of the URI are
not allowed.
constraint_allowempty FALSE | TRUE
Historically, slapo-constraint rejected Modify/Add requests
with an empty sequence of modifications. This was not
intentional and if this option is TRUE, such modifications
will be allowed so long as they are otherwise valid. The
default is FALSE to maintain backwards compatibility.
Any attempt to add or modify an attribute named as part of the
constraint overlay specification which does not fit the constraint
listed will fail with a LDAP_CONSTRAINT_VIOLATION error.
overlay constraint
constraint_attribute jpegPhoto size 131072
constraint_attribute userPassword count 3
constraint_attribute mail regex ^[[:alnum:]]+@mydomain.com$
constraint_attribute mail negregex ^[[:alnum:]]+@notallowed.com$
constraint_attribute title uri
ldap:///dc=catalog,dc=example,dc=com?title?sub?(objectClass=titleCatalog)
constraint_attribute cn neguri
ldap:///ou=People,dc=example,dc=com?cn,sn?sub?(objectClass=inetOrgPerson)
constraint_attribute cn,sn,givenName set
"(this/givenName + [ ] + this/sn) & this/cn"
restrict="ldap:///ou=People,dc=example,dc=com??sub?(objectClass=inetOrgPerson)"
A specification like the above would reject any mail attribute
which did not look like <alphanumeric string>@mydomain.com or that
looks like <alphanumeric string>@notallowed.com. It would also
reject any title attribute whose values were not listed in the
title attribute of any titleCatalog entries in the given scope.
(Note that the "dc=catalog,dc=example,dc=com" subtree ought to
reside in a separate database, otherwise the initial set of
titleCatalog entries could not be populated while the constraint
is in effect.) With the type "neguri" (negated "uri"), it would
ensure uniqueness of one (or more) attributes against one (or
more) other attributes. A specification like the above would
reject any cn attributes whose any values was already listed in
another cn or sn attributes of any inetOrgPerson entries in the
given scope. Finally, it requires the values of the attribute cn
to be constructed by pairing values of the attributes sn and
givenName, separated by a space, but only for entries derived from
the objectClass inetOrgPerson. Should the type "negset" have been
used instead of "set", the condition would have been reversed.
ETCDIR/slapd.conf
default slapd configuration file
slapd.conf(5), slapd-config(5),
This module was written in 2005 by Neil Dunbar of Hewlett-Packard
and subsequently extended by Howard Chu and Emmanuel Dreyfus.
OpenLDAP Software is developed and maintained by The OpenLDAP
Project <http://www.openldap.org/>. OpenLDAP Software is derived
from the University of Michigan LDAP 3.3 Release.
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-CONSTRAINT(5)
Pages that refer to this page: slapd.overlays(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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