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SLAPD-SOCK(5)                          File Formats Manual                          SLAPD-SOCK(5)

       slapd-sock - Socket backend/overlay to slapd


       The  Socket  backend  to slapd(8) uses an external program to handle queries, similarly to
       slapd-shell(5).  However, in this case the external  program  listens  on  a  Unix  domain
       socket.   This  makes  it  possible  to  have  a  pool of processes, which persist between
       requests. This allows multithreaded operation and a higher level of efficiency. The exter‐
       nal program must have been started independently; slapd(8) itself will not start it.

       This module may also be used as an overlay on top of some other database.  Use as an over‐
       lay allows external actions to be triggered in response to operations on  the  main  data‐

       These  slapd.conf options apply to the SOCK backend database.  That is, they must follow a
       "database sock" line and come before any subsequent "backend" or "database" lines.   Other
       database options are described in the slapd.conf(5) manual page.

       Alternatively,  to use this module as an overlay, these directives must follow an "overlay
       sock" line within an existing database definition.

       extensions [ binddn | peername | ssf | connid ]*
              Enables the sending of additional meta-attributes with each request.
              binddn: <bound DN>
              peername: IP=<address>:<port>
              ssf: <SSF value>
              connid: <connection ID>

       socketpath <pathname>
              Gives the path to a Unix domain socket to which the commands will be sent and  from
              which replies are received.

              When used as an overlay, these additional directives are defined:

       sockops   [ bind | unbind | search | compare | modify | modrdn | add | delete ]*
              Specify  which  request types to send to the external program. The default is empty
              (no requests are sent).

       sockresps [ result | search ]*
              Specify which response types to send to the external program. "result"  sends  just
              the  results of an operation. "search" sends all entries that the database returned
              for a search request. The default is empty (no responses are sent).

       The protocol is essentially the same as slapd-shell(5) with the addition of a  newline  to
       terminate the command parameters. The following commands are sent:
              msgid: <message id>
              <repeat { "suffix:" <database suffix DN> }>
              <entry in LDIF format>
              <blank line>

              msgid: <message id>
              <repeat { "suffix:" <database suffix DN> }>
              dn: <DN>
              method: <method number>
              credlen: <length of <credentials>>
              cred: <credentials>
              <blank line>

              msgid: <message id>
              <repeat { "suffix:" <database suffix DN> }>
              dn: <DN>
              <attribute>: <value>
              <blank line>

              msgid: <message id>
              <repeat { "suffix:" <database suffix DN> }>
              dn: <DN>
              <blank line>

              msgid: <message id>
              <repeat { "suffix:" <database suffix DN> }>
              dn: <DN>
              <repeat {
                  <"add"/"delete"/"replace">: <attribute>
                  <repeat { <attribute>: <value> }>
              <blank line>

              msgid: <message id>
              <repeat { "suffix:" <database suffix DN> }>
              dn: <DN>
              newrdn: <new RDN>
              deleteoldrdn: <0 or 1>
              <if new superior is specified: "newSuperior: <DN>">
              <blank line>

              msgid: <message id>
              <repeat { "suffix:" <database suffix DN> }>
              base: <base DN>
              scope: <0-2, see ldap.h>
              deref: <0-3, see ldap.h>
              sizelimit: <size limit>
              timelimit: <time limit>
              filter: <filter>
              attrsonly: <0 or 1>
              attrs: <"all" or space-separated attribute list>
              <blank line>

              msgid: <message id>
              <repeat { "suffix:" <database suffix DN> }>
              <blank line>

       The commands - except unbind - should output:
              code: <integer>
              matched: <matched DN>
              info: <text>
       where  only  RESULT  is mandatory, and then close the socket.  The search RESULT should be
       preceded by the entries in LDIF format, each entry followed by a blank line.  Lines start‐
       ing with `#' or `DEBUG:' are ignored.

       When used as an overlay, the external program should return a CONTINUE response if request
       processing should continue normally, or a regular RESULT response if the external  program
       wishes to bypass the underlying database.

       If  the overlay is configured to send response messages to the external program, they will
       appear as an extended RESULT message or as an ENTRY message,  defined  below.  The  RESULT
       message is similar to the one above, but also includes the msgid and any configured exten‐
              msgid: <message id>
              code: <integer>
              matched: <matched DN>
              info: <text>
              <blank line>

       Typically both the msgid and the connid will be needed to match  a  result  message  to  a
       request. The ENTRY message has the form
              msgid: <message id>
              <entry in LDIF format>
              <blank line>

       The  sock  backend  does  not honor all ACL semantics as described in slapd.access(5).  In
       general, access to objects is checked by using a dummy object that contains only  the  DN,
       so access rules that rely on the contents of the object are not honored.  In detail:

       The  add  operation does not require write (=w) access to the children pseudo-attribute of
       the parent entry.

       The bind operation requires auth (=x) access to the entry pseudo-attribute  of  the  entry
       whose  identity is being assessed; auth (=x) access to the credentials is not checked, but
       rather delegated to the underlying program.

       The compare operation requires compare (=c) access to the entry  pseudo-attribute  of  the
       object  whose value is being asserted; compare (=c) access to the attribute whose value is
       being asserted is not checked.

       The delete operation does not require write (=w) access to the  children  pseudo-attribute
       of the parent entry.

       The  modify operation requires write (=w) access to the entry pseudo-attribute; write (=w)
       access to the specific attributes that are modified is not checked.

       The modrdn operation does not require write (=w) access to the  children  pseudo-attribute
       of the parent entry, nor to that of the new parent, if different; write (=w) access to the
       distinguished values of the naming attributes is not checked.

       The search operation does not require search (=s) access to the entry pseudo_attribute  of
       the  searchBase; search (=s) access to the attributes and values used in the filter is not

       There is an example script in the slapd/back-sock/ directory in the OpenLDAP source tree.

              default slapd configuration file

       slapd.conf(5), slapd-config(5), slapd(8).

       Brian Candler, with enhancements by Howard Chu

OpenLDAP                                    2014/09/20                              SLAPD-SOCK(5)

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