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slapo-translucent(5)


NAME

   slapo-translucent - Translucent Proxy overlay to slapd

SYNOPSIS

   /etc/ldap/slapd.conf

DESCRIPTION

   The  Translucent Proxy overlay can be used with a backend database such
   as slapd-bdb(5) to create a  "translucent  proxy".   Entries  retrieved
   from  a  remote LDAP server may have some or all attributes overridden,
   or new attributes added, by entries in the local database before  being
   presented to the client.

   A search operation is first populated with entries from the remote LDAP
   server, the attributes of which are then overridden with any attributes
   defined  in  the  local database. Local overrides may be populated with
   the add, modify , and modrdn operations, the use of which is restricted
   to the root user.

   A  compare  operation will perform a comparison with attributes defined
   in the local database record (if any) before  any  comparison  is  made
   with data in the remote database.

CONFIGURATION

   The Translucent Proxy overlay uses a proxied database, typically a (set
   of) remote LDAP server(s), which is configured with the  options  shown
   in  slapd-ldap(5),  slapd-meta(5) or similar.  These slapd.conf options
   are specific to the Translucent Proxy overlay; they must  appear  after
   the overlay directive that instantiates the translucent overlay.

   translucent_strict
          By default, attempts to delete attributes in either the local or
          remote    databases    will    be    silently    ignored.    The
          translucent_strict  directive causes these modifications to fail
          with a Constraint Violation.

   translucent_no_glue
          This configuration option disables  the  automatic  creation  of
          "glue"  records  for  an  add or modrdn operation, such that all
          parents of an entry added to the local database must be  created
          by hand. Glue records are always created for a modify operation.

   translucent_local <attr[,attr...]>
          Specify  a list of attributes that should be searched for in the
          local database when used in a search filter. By default,  search
          filters  are  only  handled  by  the  remote database. With this
          directive, search filters will be split into a local and  remote
          portion, and local attributes will be searched locally.

   translucent_remote <attr[,attr...]>
          Specify  a list of attributes that should be searched for in the
          remote database when used in a  search  filter.  This  directive
          complements  the  translucent_local directive. Attributes may be
          specified as both local and remote if desired.

   If neither translucent_local nor translucent_remote are specified,  the
   default  behavior  is  to  search the remote database with the complete
   search filter. If only translucent_local is  specified,  searches  will
   only be run on the local database. Likewise, if only translucent_remote
   is specified, searches will only be run on the remote database. In  any
   case,  both  the  local  and  remote  entries corresponding to a search
   result will be merged before being returned to the client.

   translucent_bind_local
          Enable looking for locally stored credentials  for  simple  bind
          when binding to the remote database fails.  Disabled by default.

   translucent_pwmod_local
          Enable  RFC  3062  Password  Modification  extended operation on
          locally stored  credentials.   The  operation  only  applies  to
          entries that exist in the remote database.  Disabled by default.

ACCESS CONTROL

   Access control is delegated to either the remote DSA(s) or to the local
   database backend for auth and write operations.  It is delegated to the
   remote  DSA(s)  and  to the frontend for read operations.  Local access
   rules involving data returned by the remote DSA(s) should  be  designed
   with  care.   In  fact,  entries are returned by the remote DSA(s) only
   based on the remote fraction of the data, based  on  the  identity  the
   operation is performed as.  As a consequence, local rules might only be
   allowed to see a portion of the remote data.

CAVEATS

   The Translucent Proxy overlay will disable schema checking in the local
   database,  so  that  an entry consisting of overlay attributes need not
   adhere to the complete schema.

   Because the translucent overlay does not perform any DN rewrites,   the
   local  and  remote database instances must have the same suffix.  Other
   configurations will probably fail with No Such Object and other errors.

FILES

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

SEE ALSO

   slapd.conf(5), slapd-config(5), slapd-ldap(5).



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