Man Linux: Main Page and Category List


       slapo-constraint - Attribute Constraint Overlay to slapd




       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.


       This slapd.conf option applies to the constraint  overlay.   It  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.   Five
              types  of  constraint  are  currently  supported  - regex, size,
              count, uri, and set.

              The parameter following the regex type is a Unix  style  regular
              expression (See regex(7) ). The parameter following the uri 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  type  is  a  string  that  is
              interpreted  according  to the syntax in use for ACL sets.  This
              allows to construct constraints based on  the  contents  of  the

              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

              Extra  parameters  can  occur in any order after those described

              <extra> : restrict=<uri>

              This extra parameter allows 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.

       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:]]$
              constraint_attribute title uri
              constraint_attribute cn,sn,givenName set
                "(this/givenName + [ ] + this/sn) & this/cn"

       A  specification  like  the above would reject any mail attribute which
       did not look like <alpha-numeric string>  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.)  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.


              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
       <>.    OpenLDAP   Software   is   derived  from
       University of Michigan LDAP 3.3 Release.