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slapd−sock — Socket backend/overlay to slapd
ETCDIR/slapd.conf
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 external 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 overlay allows external actions to be triggered in response to operations on the main database.
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.
Enables the sending of additional meta-attributes with each request.
binddn: <bound DN> peername: IP=<address>:<port> ssf: <SSF value> connid: <connection ID>
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:
Specify which request types to send to the external program. The default is empty (no requests are sent).
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:
ADD msgid: <message id> <repeat { "suffix:" <database suffix DN> }> <entry in LDIF format> <blank line>
BIND msgid: <message id> <repeat { "suffix:" <database suffix DN> }> dn: <DN> method: <method number> credlen: <length of <credentials>> cred: <credentials> <blank line>
COMPARE msgid: <message id> <repeat { "suffix:" <database suffix DN> }> dn: <DN> <attribute>: <value> <blank line>
DELETE msgid: <message id> <repeat { "suffix:" <database suffix DN> }> dn: <DN> <blank line>
MODIFY msgid: <message id> <repeat { "suffix:" <database suffix DN> }> dn: <DN> <repeat { <"add"/"delete"/"replace">: <attribute> <repeat { <attribute>: <value> }> − }> <blank line>
MODRDN 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>
SEARCH 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>
UNBIND msgid: <message id> <repeat { "suffix:" <database suffix DN> }> <blank line>
The commands - except unbind - should output:
RESULT 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 starting 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 extensions:
RESULT 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
ENTRY 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 checked.