slapd.conf.5

ldap服务器源码

.TH SLAPD.CONF 5 "RELEASEDATE" "OpenLDAP LDVERSION"
.\" Copyright 1998-2007 The OpenLDAP Foundation All Rights Reserved.
.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
.\" $OpenLDAP: pkg/ldap/doc/man/man5/slapd.conf.5,v 1.191.2.26 2007/01/02 21:43:45 kurt Exp $
.SH NAME
slapd.conf \- configuration file for slapd, the stand-alone LDAP daemon
.SH SYNOPSIS
ETCDIR/slapd.conf
.SH DESCRIPTION
The file
.B ETCDIR/slapd.conf
contains configuration information for the
.BR slapd (8)
daemon.  This configuration file is also used by the
.BR slurpd (8)
replication daemon and by the SLAPD tools
.BR slapacl (8),
.BR slapadd (8),
.BR slapauth (8),
.BR slapcat (8),
.BR slapdn (8),
.BR slapindex (8),
and
.BR slaptest (8).
.LP
The
.B slapd.conf
file consists of a series of global configuration options that apply to
.B slapd
as a whole (including all backends), followed by zero or more database
backend definitions that contain information specific to a backend
instance.
The configuration options are case-insensitive;
their value, on a case by case basis, may be case-sensitive.
.LP
The general format of
.B slapd.conf
is as follows:
.LP
.nf
    # comment - these options apply to every database
    <global configuration options>
    # first database definition & configuration options
    database <backend 1 type>
    <configuration options specific to backend 1>
    # subsequent database definitions & configuration options
    ...
.fi
.LP
As many backend-specific sections as desired may be included.  Global
options can be overridden in a backend (for options that appear more
than once, the last appearance in the
.B slapd.conf
file is used).
.LP
If a line begins with white space, it is considered a continuation
of the previous line.  Blank lines and comment lines beginning with
a `#' character are ignored.  Note: continuation lines are unwrapped
before comment processing is applied.
.LP
Arguments on configuration lines are separated by white space. If an
argument contains white space, the argument should be enclosed in
double quotes.  If an argument contains a double quote (`"') or a
backslash character (`\\'), the character should be preceded by a
backslash character.
.LP
The specific configuration options available are discussed below in the
Global Configuration Options, General Backend Options, and General Database
Options.  Backend-specific options are discussed in the
.B slapd-<backend>(5)
manual pages.  Refer to the "OpenLDAP Administrator's Guide" for more
details on the slapd configuration file.
.SH GLOBAL CONFIGURATION OPTIONS
Options described in this section apply to all backends, unless specifically 
overridden in a backend definition. Arguments that should be replaced by 
actual text are shown in brackets <>.
.TP
.B access to <what> "[ by <who> <access> <control> ]+"
Grant access (specified by <access>) to a set of entries and/or
attributes (specified by <what>) by one or more requestors (specified
by <who>).
If no access controls are present, the default policy
allows anyone and everyone to read anything but restricts
updates to rootdn.  (e.g., "access to * by * read").
The rootdn can always read and write EVERYTHING!
See
.BR slapd.access (5)
and the "OpenLDAP's Administrator's Guide" for details.
.TP
.B allow <features>
Specify a set of features (separated by white space) to
allow (default none).
.B bind_v2
allows acceptance of LDAPv2 bind requests.  Note that
.BR slapd (8)
does not truly implement LDAPv2 (RFC 1777), now Historic (RFC 3494).
.B bind_anon_cred
allows anonymous bind when credentials are not empty (e.g.
when DN is empty).
.B bind_anon_dn
allows unauthenticated (anonymous) bind when DN is not empty.
.B update_anon
allows unauthenticated (anonymous) update operations to be processed
(subject to access controls and other administrative limits).
.TP
.B argsfile <filename>
The ( absolute ) name of a file that will hold the 
.B slapd
server's command line options
if started without the debugging command line option.
.TP
.B attributeoptions [option-name]...
Define tagging attribute options or option tag/range prefixes.
Options must not end with `-', prefixes must end with `-'.
The `lang-' prefix is predefined.
If you use the
.B attributeoptions
directive, `lang-' will no longer be defined and you must specify it
explicitly if you want it defined.

An attribute description with a tagging option is a subtype of that
attribute description without the option.
Except for that, options defined this way have no special semantics.
Prefixes defined this way work like the `lang-' options:
They define a prefix for tagging options starting with the prefix.
That is, if you define the prefix `x-foo-', you can use the option
`x-foo-bar'.
Furthermore, in a search or compare, a prefix or range name (with
a trailing `-') matches all options starting with that name, as well
as the option with the range name sans the trailing `-'.
That is, `x-foo-bar-' matches `x-foo-bar' and `x-foo-bar-baz'.

RFC 4520 reserves options beginning with `x-' for private experiments.
Other options should be registered with IANA, see RFC 4520 section 3.5.
OpenLDAP also has the `binary' option built in, but this is a transfer
option, not a tagging option.
.HP
.hy 0
.B attributetype "(\ <oid>\
 [NAME\ <name>]\
 [DESC\ <description>]\
 [OBSOLETE]\
 [SUP\ <oid>]\
 [EQUALITY\ <oid>]\
 [ORDERING\ <oid>]\
 [SUBSTR\ <oid>]\
 [SYNTAX\ <oidlen>]\
 [SINGLE\-VALUE]\
 [COLLECTIVE]\
 [NO\-USER\-MODIFICATION]\
 [USAGE\ <attributeUsage>]\ )"
.RS
Specify an attribute type using the LDAPv3 syntax defined in RFC 4512.
The slapd parser extends the RFC 4512 definition by allowing string
forms as well as numeric OIDs to be used for the attribute OID and
attribute syntax OID.
(See the
.B objectidentifier
description.) 
.RE
.TP
.B authz-policy <policy>
Used to specify which rules to use for Proxy Authorization.  Proxy
authorization allows a client to authenticate to the server using one
user's credentials, but specify a different identity to use for authorization
and access control purposes. It essentially allows user A to login as user
B, using user A's password.
The
.B none
flag disables proxy authorization. This is the default setting.
The
.B from
flag will use rules in the
.I authzFrom
attribute of the authorization DN.
The
.B to
flag will use rules in the
.I authzTo
attribute of the authentication DN.
The
.B any
flag, an alias for the deprecated value of
.BR both ,
will allow any of the above, whatever succeeds first (checked in
.BR to ,
.B from
sequence.
The
.B all
flag requires both authorizations to succeed.
.LP
.RS
The rules are mechanisms to specify which identities are allowed 
to perform proxy authorization.
The
.I authzFrom
attribute in an entry specifies which other users
are allowed to proxy login to this entry. The
.I authzTo
attribute in
an entry specifies which other users this user can authorize as.  Use of
.I authzTo
rules can be easily
abused if users are allowed to write arbitrary values to this attribute.
In general the
.I authzTo
attribute must be protected with ACLs such that
only privileged users can modify it.
The value of
.I authzFrom
and
.I authzTo
describes an 
.B identity 
or a set of identities; it can take five forms:
.RS
.TP
.B ldap:///<base>??[<scope>]?<filter>
.RE
.RS
.B dn[.<dnstyle>]:<pattern>
.RE
.RS
.B u[<mech>[<realm>]]:<pattern>
.RE
.RS
.B group[/objectClass[/attributeType]]:<pattern>
.RE
.RS
.B <pattern>
.RE
.RS

.B <dnstyle>:={exact|onelevel|children|subtree|regex}

.RE
The first form is a valid LDAP
.B URI
where the 
.IR <host>:<port> ,
the
.I <attrs>
and the
.I <extensions>
portions must be absent, so that the search occurs locally on either
.I authzFrom
or 
.IR authzTo .
The second form is a 
.BR DN ,
with the optional style modifiers
.IR exact ,
.IR onelevel ,
.IR children ,
and
.I subtree
for exact, onelevel, children and subtree matches, which cause 
.I <pattern>
to be normalized according to the DN normalization rules, or the special
.I regex
style, which causes the
.I <pattern>
to be treated as a POSIX (''extended'') regular expression, as
discussed in
.BR regex (7)
and/or
.BR re_format (7).
A pattern of
.I *
means any non-anonymous DN.
The third form is a SASL
.BR id ,
with the optional fields
.I <mech>
and
.I <realm>
that allow to specify a SASL
.BR mechanism ,
and eventually a SASL
.BR realm ,
for those mechanisms that support one.
The need to allow the specification of a mechanism is still debated, 
and users are strongly discouraged to rely on this possibility.
The fourth form is a group specification, consisting of the keyword
.BR group ,
optionally followed by the specification of the group
.B objectClass
and member
.BR attributeType .
The group with DN
.B <pattern>
is searched with base scope, and in case of match, the values of the
member
.B attributeType
are searched for the asserted DN.
For backwards compatibility, if no identity type is provided, i.e. only
.B <pattern>
is present, an
.I exact DN
is assumed; as a consequence, 
.B <pattern>
is subjected to DN normalization.
Since the interpretation of
.I authzFrom
and
.I authzTo
can impact security, users are strongly encouraged 
to explicitly set the type of identity specification that is being used.
A subset of these rules can be used as third arg in the 
.B authz-regexp
statement (see below); significantly, the 
.I URI
and the
.I dn.exact:<dn> 
forms.
.RE
.TP
.B authz-regexp <match> <replace>
Used by the authentication framework to convert simple user names,
such as provided by SASL subsystem, to an LDAP DN used for
authorization purposes.  Note that the resultant DN need not refer
to an existing entry to be considered valid.  When an authorization
request is received from the SASL subsystem, the SASL 
.BR USERNAME ,
.BR REALM , 
and
.B MECHANISM
are taken, when available, and combined into a name of the form
.RS
.RS
.TP
.B UID=<username>[[,CN=<realm>],CN=<mechanism>],CN=auth

.RE
This name is then compared against the
.B match
POSIX (''extended'') regular expression, and if the match is successful,
the name is replaced with the
.B replace
string.  If there are wildcard strings in the 
.B match
regular expression that are enclosed in parenthesis, e.g. 
.RS
.TP
.B UID=([^,]*),CN=.*

.RE
then the portion of the name that matched the wildcard will be stored
in the numbered placeholder variable $1. If there are other wildcard strings
in parenthesis, the matching strings will be in $2, $3, etc. up to $9. The 
placeholders can then be used in the 
.B replace
string, e.g. 
.RS
.TP
.B UID=$1,OU=Accounts,DC=example,DC=com 

.RE
The replaced name can be either a DN, i.e. a string prefixed by "dn:",
or an LDAP URI.
If the latter, the server will use the URI to search its own database(s)
and, if the search returns exactly one entry, the name is
replaced by the DN of that entry.   The LDAP URI must have no
hostport, attrs, or extensions components, but the filter is mandatory,
e.g.
.RS
.TP
.B ldap:///OU=Accounts,DC=example,DC=com??one?(UID=$1)

.RE
The protocol portion of the URI must be strictly
.BR ldap .
Note that this search is subject to access controls.  Specifically,
the authentication identity must have "auth" access in the subject.

Multiple 
.B authz-regexp 
options can be given in the configuration file to allow for multiple matching 
and replacement patterns. The matching patterns are checked in the order they 
appear in the file, stopping at the first successful match.

.\".B Caution:
.\"Because the plus sign + is a character recognized by the regular expression engine,
.\"and it will appear in names that include a REALM, be careful to escape the
.\"plus sign with a backslash \\+ to remove the character's special meaning.
.RE
.TP
.B concurrency <integer>
Specify a desired level of concurrency.  Provided to the underlying
thread system as a hint.  The default is not to provide any hint.
.TP
.B conn_max_pending <integer>
Specify the maximum number of pending requests for an anonymous session.
If requests are submitted faster than the server can process them, they
will be queued up to this limit. If the limit is exceeded, the session
is closed. The default is 100.
.TP
.B conn_max_pending_auth <integer>
Specify the maximum number of pending requests for an authenticated session.
The default is 1000.
.TP
.B defaultsearchbase <dn>
Specify a default search base to use when client submits a
non-base search request with an empty base DN.
Base scoped search requests with an empty base DN are not affected.
.TP
.B disallow <features>
Specify a set of features (separated by white space) to
disallow (default none).
.B bind_anon
disables acceptance of anonymous bind requests.  Note that this setting
does not prohibit anonymous directory access (See "require authc").
.B bind_simple
disables simple (bind) authentication.
.B tls_2_anon
disables forcing session to anonymous status (see also
.BR tls_authc ) upon StartTLS operation receipt.
.B tls_authc
dissallow the StartTLS operation if authenticated (see also
.BR tls_2_anon ).
.HP
.hy 0
.B ditcontentrule "(\ <oid>\
 [NAME\ <name>]\
 [DESC\ <description>]\
 [OBSOLETE]\
 [AUX\ <oids>]\
 [MUST\ <oids>]\
 [MAY\ <oids>]\
 [NOT\ <oids>]\ )"
.RS
Specify an DIT Content Rule using the LDAPv3 syntax defined in RFC 4512.
The slapd parser extends the RFC 4512 definition by allowing string
forms as well as numeric OIDs to be used for the attribute OID and
attribute syntax OID.
(See the
.B objectidentifier
description.) 
.RE
.TP
.B gentlehup { on | off }
A SIGHUP signal will only cause a 'gentle' shutdown-attempt:
.B Slapd
will stop listening for new connections, but will not close the
connections to the current clients.  Future write operations return
unwilling-to-perform, though.  Slapd terminates when all clients
have closed their connections (if they ever do), or \- as before \-
if it receives a SIGTERM signal.  This can be useful if you wish to
terminate the server and start a new
.B slapd
server
.B with another database,
without disrupting the currently active clients.
The default is off.  You may wish to use
.B idletimeout
along with this option.
.TP
.B idletimeout <integer>
Specify the number of seconds to wait before forcibly closing
an idle client connection.  A idletimeout of 0 disables this
feature.  The default is 0.
.TP
.B include <filename>
Read additional configuration information from the given file before
continuing with the next line of the current file.
.TP
.B index_substr_if_minlen <integer>
Specify the minimum length for subinitial and subfinal indices. An
attribute value must have at least this many characters in order to be
processed by the indexing functions. The default is 2.
.TP
.B index_substr_if_maxlen <integer>
Specify the maximum length for subinitial and subfinal indices. Only
this many characters of an attribute value will be processed by the
indexing functions; any excess characters are ignored. The default is 4.
.TP
.B index_substr_any_len <integer>
Specify the length used for subany indices. An attribute value must have
at least this many characters in order to be processed. Attribute values
longer than this length will be processed in segments of this length. The
default is 4. The subany index will also be used in subinitial and
subfinal index lookups when the filter string is longer than the
.I index_substr_if_maxlen
value.
.TP
.B index_substr_any_step <integer>