openldap/doc/guide/admin/slapdconfig.sdf

# $OpenLDAP$
# Copyright 1999-2000, The OpenLDAP Foundation, All Rights Reserved.
# COPYING RESTRICTIONS APPLY, see COPYRIGHT.

H1: The slapd Configuration File

Once the software has been built and installed, you are ready
to configure {{slapd}}(8) for use at your site. The slapd
runtime configuration is primarily accomplished through the
{{slapd.conf}}(5) file, normally installed in the
{{EX:/usr/local/etc/openldap}} directory.

An alternate configuration file can be specified via a
command-line option to {{slapd}}(8) or {{slurpd}}(8). This chapter
describes the general format of the config file, followed by a
detailed description of commonly used config file directives.


H2: Configuration File Format

The {{slapd.conf}}(5) file consists of three types of configuration
information: global, backend specific, and database specific.  Global
information is specified first, followed by information associated
with a particular backend type, which is then followed by information
associated with a particular database instance.  Global directives can
be overridden in a backend and/or database directives, backend directives
can be overridden by database directives.

Blank lines and comment lines beginning with a '{{EX:#}}' character
are ignored.  If a line begins with white space, it is considered a
continuation of the previous line. The general format of slapd.conf is
as follows:

>	# global configuration directives
>	<global config directives>
>
>	# backend definition
>	backend <typeA>
>	<backend-specific directives>
>
>	# first database definition & config directives
>	database <typeA>
>	<database-specific directives>
>
>	# second database definition & config directives
>	database <typeB>
>	<database-specific directives>
>
>	# second database definition & config directives
>	database <typeA>
>	<database-specific directives>
>
>	# subsequent backend & database definitions & config directives
>	...

A configuration directive may take arguments.  If so, they are
separated by white space.  If an argument contains white space,
the argument should be enclosed in double quotes {{EX:"like this"}}. If
an argument contains a double quote or a backslash character `{{EX:\}}',
the character should be preceded by a backslash character `{{EX:\}}'.

The distribution contains an example configuration file that will
be installed in the {{F: /usr/local/etc/openldap}} directory.
A number of files containing schema definitions (attribute types
and object classes) are also provided in the
{{F: /usr/local/etc/openldap/schema}} directory.


H2: Configuration File Directives

This section details commonly used configuration directives.  For
a complete list, see {{slapd.conf}}(5) manual page.  This section
separates the configuration file directives into global,
backend-specific and data-specific categories, describing each
directive and its default value (if any), and giving an example of
its use.



H3: Global Directives

Directives described in this section apply to all backends
and databases unless specifically overridden in a backend or
database definition.  Arguments that should be replaced
by actual text are shown in brackets {{EX:<>}}.


H4: access to <what> [ by <who> <accesslevel> <control> ]+

This directive grants access (specified by <accesslevel>) to a
set of entries and/or attributes (specified by <what>) by one or
more requesters (specified by <who>).
See the {{SECT:Access Control}} section of this chapter for a
summary of basic usage.
!if 0
More details discussion of this directive can be found in the
{{SECT:Advanced Access Control}} chapter.
!endif


H4: attributetype <{{REF:RFC2252}} Attribute Type Description>

This directive defines an attribute type.
Please see the {{SECT:Schema Specification}} chapter
for information regarding how to use this directive.

H4: defaultaccess { none | compare | search | read | write }

This directive specifies the default access to grant requesters
when no {{EX:access}} directives have been specified.  Any given
access level implies all lesser access levels (e.g., read access
implies search and compare but not write).

Note: It is recommend that the {{EX:access}} directive be used
to specify access control.  See the {{SECT:Access Control}}
section of this chapter for information regarding the {{EX:access}}
directive.

\Default:

E: defaultaccess read


H4: idletimeout <integer>

Specify the number of seconds to wait before forcibly closing
an idle client connection.  An idletimeout of 0, the default,
disables this feature.


H4: include <filename>

This directive specifies that slapd should read additional
configuration information from the given file before continuing
with the next line of the current file. The included file should
follow the normal slapd config file format.  The file is commonly
used to include files containing schema specifications.

Note: You should be careful when using this directive - there is
no small limit on the number of nested include directives, and no
loop detection is done.

H4: loglevel <integer>

This directive specifies the level at which debugging statements
and operation statistics should be syslogged (currently logged to
the {{syslogd}}(8) {EX:LOG_LOCAL4}} facility). You must have
configured OpenLDAP {{EX:--enable-debug}} (the default) for this
to work (except for the two statistics levels, which are always
enabled).  Log levels are additive. To display what numbers
correspond to what kind of debugging, invoke slapd with {{EX:-?}}
or consult the table below. The possible values for <integer> are:

!block table; colaligns="RL"; align=Center; \
	title="Table 5.1: Debugging Levels"
Level	Description
-1	enable all debugging
0	no debugging
1	trace function calls
2	debug packet handling
4	heavy trace debugging
8	connection management
16	print out packets sent and received
32	search filter processing
64	configuration file processing
128	access control list processing
256	stats log connections/operations/results
512	stats log entries sent
1024	print communication with shell backends
2048	print entry parsing debugging
!endblock

\Example:

E: loglevel -1

This will cause lots and lots of debugging information to be
logged.

\Default:

E: loglevel 256


H4: objectclass <{{REF:RFC2252}} Object Class Description>

This directive defines an object class.
Please see the {{SECT:Schema Specification}} chapter for
information regarding how to use this directive.


H4: referral <URI>

This directive specifies the referral to pass back when slapd
cannot find a local database to handle a request.

\Example:

>	referral ldap://root.openldap.org

This will refer non-local queries to the global root LDAP server
at the OpenLDAP Project. Smart LDAP clients can re-ask their
query at that server, but note that most of these clients are
only going to know how to handle simple LDAP URLs that
contain a host part and optionally a distinguished name part.


H4: sizelimit <integer>

This directive specifies the maximum number of entries to return
from a search operation.

\Default:

>	sizelimit 500


H4: timelimit <integer>

This directive specifies the maximum number of seconds (in real
time) slapd will spend answering a search request. If a
request is not finished in this time, a result indicating an
exceeded timelimit will be returned.

\Default:

>	timelimit 3600


H3: General Backend Directives

Directives in this section apply only to the backend in which
they are defined. They are supported by every type of backend.
Backend directives apply to all databases instances of the
same type and, depending on the directive, may be overridden
by database directives.

H4: backend <type>

This directive marks the beginning of a backend definition.
{{EX:<type>}} should be one of {{EX:ldbm}}, {{EX:shell}},
{{EX:passwd}}, or other supported backend type.


H3: General Database Directives

Directives in this section apply only to the database in which
they are defined. They are supported by every type of database.

H4: database <type>

This directive marks the beginning of a new database instance
definition.
{{EX:<type>}} should be one of {{EX:ldbm}}, {{EX:shell}},
{{EX:passwd}}, or other supported database type.

\Example:

>	database ldbm

This marks the beginning of a new LDBM backend database
instance definition.


H4: readonly { on | off }

This directive puts the database into "read-only" mode. Any
attempts to modify the database will return an "unwilling to
perform" error.

\Default:

>	readonly off

H4: replica

>	replica host=<hostname>[:<port>]
>		[bindmethod={ simple | kerberos | sasl }]
>		["binddn=<DN>"]
>		[mech=<mech>]
>		[authcid=<identity>]
>		[authzid=<identity>]
>		[credentials=<password>]
>		[srvtab=<filename>]

This directive specifies a replication site for this database. The
{{EX:host=}} parameter specifies a host and optionally a port where
the slave slapd instance can be found. Either a domain name
or IP address may be used for <hostname>. If <port> is not
given, the standard LDAP port number (389) is used.

The {{EX:binddn=}} parameter gives the DN to bind as for updates to
the slave slapd. It should be a DN which has read/write
access to the slave slapd's database, typically given as a
{{EX:rootdn}} in the slave's config file. It must also match the
{{EX:updatedn}} directive in the slave slapd's config file. Since DNs are
likely to contain embedded spaces, the entire {{EX:"binddn=<DN>"}}
string should be enclosed in double quotes.

The {{EX:bindmethod}} is {{EX:simple}} or {{EX:kerberos}} or {{EX:sasl}},
depending on whether simple password-based authentication or Kerberos
authentication or {{TERM:SASL}} authentication is to be used when connecting
to the slave slapd.

Simple authentication should not be used unless adequate integrity
and privacy protections are in place (e.g. TLS or IPSEC).  Simple
authentication requires specification of {{EX:binddn}} and
{{EX:credentials}} parameters.

Kerberos authentication is deprecated in favor of SASL authentication
mechanisms, in particular the {{EX:KERBEROS_V4}} and {{EX:GSSAPI}}
mechanisms.  Kerberos authentication requires {{EX:binddn}} and
{{EX:srvtab}} parameters.

SASL authentication is generally recommended.  SASL authentication
requires specification of a mechanism using the {{EX:mech}} parameter.
Depending on the mechanism, an authentication identity and/or
credentials can be specified using {{EX:authcid}} and {{EX:credentials}}
respectively.  The {{EX:authzid}} parameter may be used to specify
an authorization identity.

See the chapter entitled {{SECT:Replication with slurpd}} for more
information on how to use this directive.


H4: replogfile <filename>

This directive specifies the name of the replication log file to
which slapd will log changes. The replication log is typically
written by slapd and read by slurpd. Normally, this directive is
only used if slurpd is being used to replicate the database.
However, you can also use it to generate a transaction log, if
slurpd is not running. In this case, you will need to periodically
truncate the file, since it will grow indefinitely otherwise.

See the chapter entitled {{SECT:Replication with slurpd}} for more
information on how to use this directive.


H4: rootdn <dn>

This directive specifies the DN that is not subject to
access control or administrative limit restrictions for
operations on this database.  The DN need not refer to
an entry in the directory. The DN may refer to a SASL
identity.

Entry-based Example:

>	rootdn "cn=Manager, dc=example, dc=com"

SASL-based Example:

>	rootdn "uid=root@EXAMPLE.COM"


H4: rootpw <password>

This directive specifies a password for the DN given above that
will always work, regardless of whether an entry with the given
DN exists or has a password.
This directive is deprecated in favor of SASL based authentication.

\Example:

>	rootpw secret


H4: suffix <dn suffix>

This directive specifies the DN suffix of queries that will be
passed to this backend database. Multiple suffix lines can be
given, and at least one is required for each database
definition.

\Example:

>	suffix "dc=example, dc=com"

Queries with a DN ending in "dc=example, dc=com"
will be passed to this backend.

Note: When the backend to pass a query to is selected, slapd
looks at the suffix line(s) in each database definition in the
order they appear in the file. Thus, if one database suffix is a
prefix of another, it must appear after it in the config file.

H4: updatedn <dn>

This directive is only applicable in a slave slapd. It specifies the
DN allowed to make changes to the replica.  This may be the
the DN slurpd binds as when making changes to the replica or
the DN associated with a SASL identity.

Entry-based Example:

>	updatedn "cn=Update Daemon, dc=example, dc=com"

SASL-based Example:

>	updatedn "uid=slurpd@EXAMPLE.COM"

See the {{SECT:Replication}} chapter for more information on how to
use this directive.

H4: updateref <URL>

This directive is only applicable in a slave slapd. It
specifies the URL to return to clients which submit update
requests upon the replica.
If specified multiple times, each {{TERM:URL}} is provided.

\Example:

>	update	ldap://master.example.net


H3: LDBM Backend-Specific Directives

Directives in this category only apply to the LDBM backend
database. That is, they must follow a "database ldbm" line and
come before any other "database" line.

H4: cachesize <integer>

This directive specifies the size in entries of the in-memory
cache maintained by the LDBM backend database instance.

\Default:

>	cachesize 1000


H4: dbcachesize <integer>

This directive specifies the size in bytes of the in-memory cache
associated with each open index file. If not supported by the
underlying database method, this directive is ignored without
comment. Increasing this number uses more memory but can
cause a dramatic performance increase, especially during
modifies or when building indexes.

\Default:

>	dbcachesize 100000


H4: dbnolocking

This option, if present, disables database locking.
Enabling this option may improve performance at the expense
of data security.


H4: dbnosync

This option causes on-disk database contents not be immediately
synchronized with in memory changes upon change.  Enabling this option
may improve performance at the expense of data security.


H4: directory <directory>

This directive specifies the directory where the LDBM files
containing the database and associated indexes live.

\Default:

>	directory /usr/local/var/openldap-ldbm


H4: index {<attrlist> | default} [pres,eq,approx,sub,none]

This directive specifies the indexes to maintain for the given
attribute. If only an {{EX:<attrlist>}} is given, the default
indexes are maintained.


\Example:

>	index default pres,eq
>	index objectClass,uid
>	index cn,sn eq,sub,approx

The first line sets the default set of indices to maintain to present
and equality.  The second line causes the default (pres,eq) set
of indices to be maintained for {{EX:objectClass}} and {{EX:uid}} attribute
types.  The third line causes equality, substring, and approximate
indices to be maintained for {{EX:cn}} and {{EX:sn}} attribute types.

H4: mode <integer>

This directive specifies the file protection mode that newly
created database index files should have.

\Default:

>	mode 0600



H3: Other Backend Databases

{{slapd}}(8) supports a number of backend database types besides the default LDBM.

!block table; align=Center; coltags="EX,N"; \
	title="Table 5.2: Backend Database Types"
Types	Description
ldbm	Berkeley or GNU DBM compatible backend
passwd	Provides read-only access to {{F:/etc/passwd}}
shell	Shell (extern program) backend
sql	SQL Programmable backend
!endblock

See {{slapd.conf}}(5) for details.



H2: Access Control

Access to slapd entries and attributes is controlled by the
access configuration file directive. The general form of an
access line is:

>	<access directive> ::= access to <what>
>		[by <who> <access> <control>]+
>	<what> ::= * | [ dn[.<target style>]=<regex>]
>		[filter=<ldapfilter>] [attrs=<attrlist>]
>	<target style> ::= regex | base | one | subtree | children
>	<attrlist> ::= <attr> | <attr> , <attrlist>
>	<attr> ::= <attrname> | entry | children
>	<who> ::= [* | anonymous | users | self |
>		dn[.<subject style>]=<regex>]
>		[dnattr=<attrname> ]
>		[group[/<objectclass>[/<attrname>][.<basic style>]]=<regex> ]
>		[peername[.<basic style>]=<regex>]
>		[sockname[.<basic style>]=<regex>]
>		[domain[.<basic style>]=<regex>]
>		[sockurl[.<basic style>]=<regex>]
>		[set=<setspec>]
>		[aci=<attrname>]
>	<subject style> ::= regex | exact | base | one | subtree | children
>	<basic style> ::= regex | exact
>	<access> ::= [self]{<level>|<priv>}
>	<level> ::= none | auth | compare | search | read | write
>	<priv> ::= {=|+|-}{w|r|s|c|x}+
>	<control> ::= [stop | continue | break]

where the <what> part selects the entries and/or attributes to
which the access applies, the {{EX:<who>}} part specifies which
entities are granted access, and the {{EX:<access>}} part specifies
the access granted. Multiple {{EX:<who> <access> <control>}} triplets
are supported, allowing many entities to be granted different
access to the same set of entries and attributes.


H3: What to control access to

The <what> part of an access specification determines the
entries and attributes to which the access control applies.
Entries can be selected in two ways: by a regular expression
matching the entry's distinguished name:

>	dn=<regular expression>

Note: The DN pattern specified should be "normalized",
meaning that there should be no extra spaces, and commas
should be used to separate components. An example
normalized DN is "cn=Babs Jensen,dc=example,dc=com".
An example of a non-normalized DN is
"cn=Babs Jensen; dc=example, dc=com".

Or, entries may be selected by a filter matching some
attribute(s) in the entry:

>	filter=<ldap filter>

where <ldap filter> is a string representation of an LDAP
search filter, as described in {{REF:RFC2254}}.

Attributes within an entry are selected by including a
comma-separated list of attribute names in the <what>
selector:

>	attrs=<attribute list>

Access to the entry itself must be granted or denied using the
special attribute name "{{EX:entry}}". Note that giving access to an
attribute is not enough; access to the entry itself through the
{{EX:entry}} attribute is also required. The complete examples at
the end of this section should help clear things up.

Lastly, there is a special entry selector {{EX:"*"}} that is used to
select any entry.  It is used when no other {{EX:<what>}}
selector has been provided.  It's equivalent to "{{EX:dn=.*}}"


H3: Who to grant access to

The <who> part identifies the entity or entities being granted
access. Note that access is granted to "entities" not "entries."
The following table summarizes entity specifiers:

!block table; align=Center; coltags="EX,N"; \
	title="Table 5.3: Access Entity Specifiers"
Specifier	Entities
*		All, including anonymous and authenticated users
anonymous	Anonymous (non-authenticated) users
users		Authenticated users
self		User associated with target entry
dn=<regex>	Users matching regular expression
!endblock

The DN specifier takes a regular expression which is used
to match against the "normalized" DN of the current entity.

>	dn=<regular expression>

By "normalized", we mean that all extra spaces have been
removed from the entity's DN and commas are used to
separate RDN components.

Other control factors are also supported.
For example, a {{EX:<what>}} can be restricted by a
regular expression matching the client's IP address or domain name:

>	addr=<regular expression>
>	domain=<regular expression>

or by an entry listed in a DN-valued attribute in the entry to
which the access applies:

>	dnattr=<dn-valued attribute name>

The dnattr specification is used to give access to an entry
whose DN is listed in an attribute of the entry (e.g., give
access to a group entry to whoever is listed as the owner of
the group entry).


H3: The access to grant


The kind of <access> granted can be one of the following:


!block table; colaligns="LRL"; coltags="EX,EX,N"; align=Center; \
	title="Table 5.4: Access Levels"
Level	Privileges	Description
none			no access
auth	=x		needed to bind
compare	=cx		needed to compare
search	=scx		needed to apply search filters
read	=rscx		needed to read search results
write	=wrscx		needed to modify/rename
!endblock

Each level implies all lower levels of access. So, for
example, granting someone {{EX:write}} access to an entry also
grants them {{EX:read}}, {{EX:search}}, {{EX:compare}}, and 
{{EX:auth}} access.  However, one may use the privileges specifier
to grant specific permissions.


H3: Access Control Evaluation

When evaluating whether some requester should be given
access to an entry and/or attribute, slapd compares the entry
and/or attribute to the {{EX:<what>}} selectors given in the
configuration file. Access directives local to the current
database are examined first, followed by global access
directives. Within this priority, access directives are
examined in the order in which they appear in the config file.
Slapd stops with the first {{EX:<what>}} selector that matches the
entry and/or attribute. The corresponding access directive is
the one slapd will use to evaluate access.

Next, slapd compares the entity requesting access to the
{{EX:<who>}} selectors within the access directive selected above
in the order in which they appear. It stops with the first {{EX:<who>}}
selector that matches the requester. This determines the
access the entity requesting access has to the entry and/or
attribute.

Finally, slapd compares the access granted in the selected
{{EX:<access>}} clause to the access requested by the client. If it
allows greater or equal access, access is granted. Otherwise,
access is denied.

The order of evaluation of access directives makes their
placement in the configuration file important. If one access
directive is more specific than another in terms of the entries
it selects, it should appear first in the config file. Similarly, if
one {{EX:<who>}} selector is more specific than another it should
come first in the access directive. The access control
examples given below should help make this clear.



H3: Access Control Examples

The access control facility described above is quite powerful.
This section shows some examples of its use. First, some
simple examples:

>	access to * by * read

This access directive grants read access to everyone.

>	access to *
>		by self write
>		by anonymous auth
>		by * read

This directive allows users to modify their own entries,
allows authenticate, and allows authenticated users to read.
Note that only the first {{EX:by <who>}} clause which matches applies.
Hence, the anonymous users are granted {{EX:auth}}, not {{EX:read}}.
The last clause could just as well have been "{{EX:by users read}}".

The following example shows the use of a regular expression
to select the entries by DN in two access directives where
ordering is significant.

>	access to dn=".*,dc=example,dc=com"
> 		by * search
>	access to dn=".*,dc=com"
> 		by * read

Read access is granted to entries under the {{EX:dc=com}}
subtree, except for those entries under the {{EX:dc=example,dc=com}}
subtree, to which search access is granted.  No access is granted to
{{EX:dc=com}} as neither access directive matches this DN.
If the order of these access directives was reversed, the
trailing directive would never be reached, since all
{{EX:dc=example,dc=com}} entries are also {{EX:dc=com}} entries.

Also note that if no {{EX:access to}} directive matches or
no {{EX:by <who>}} clause, {{B:access is denied}}.  That is, every
{{EX:access to}} directive ends with an implicit {{EX:by * none}}
clause and every access list ends with an implicit
{{EX:access to * by * none}} directive.  Only if no access controls
are specified is the {{EX:defaultaccess}} granted.

The next example again shows the importance of ordering,
both of the access directives and the {{EX:by <who>}} clauses.
It also shows the use of an attribute selector to grant access
to a specific attribute and various {{EX:<who>}} selectors.

>	access to dn="(.*,)?dc=example,dc=com" attr=homePhone
>		by self write
>		by dn="(.*,)?dc=example,dc=com" search
>		by domain=.*\.example\.com read
>	access to dn="(.*,)?dc=example,dc=com"
>		by self write
>		by dn=".*,dc=example,dc=com" search
>		by anonymous auth

This example applies to entries in the "{{EX:dc=example, dc=com}}"
subtree. To all attributes except {{EX:homePhone}}, the entry itself
can write them, other {{EX:example.com}} entries can search by them,
anybody else has no access ((implicit {{EX:by * none}}) excepting for
authentication/authorization (which is always done anonymously).
The {{EX:homePhone}} attribute is writable by the entry, searchable
by other {{EX:example.com}} entries, readable by clients connecting
from somewhere in the {{EX:example.com}} domain, and otherwise not
readable (implicit {{EX:by * none}}).  All other access
is denied by the implicit {{EX:access to * by * none}}.

Sometimes it is useful to permit a particular DN to add or
remove itself from an attribute. For example, if you would like to
create a group and allow people to add and remove only
their own DN from the member attribute, you could accomplish
it with an access directive like this:

>	access to attr=member,entry
> 		by dnattr=member selfwrite

The dnattr {{EX:<who>}} selector says that the access applies to
entries listed in the {{EX:member}} attribute. The {{EX:selfwrite}} access
selector says that such members can only add or delete their
own DN from the attribute, not other values. The addition of
the entry attribute is required because access to the entry is
required to access any of the entry's attributes.

!if 0
For more details on how to use the {{EX:access}} directive,
consult the {{Advanced Access Control}} chapter.
!endif


H2: Configuration File Example

The following is an example configuration file, interspersed
with explanatory text. It defines two databases to handle
different parts of the {{TERM:X.500}} tree; both are {{TERM:LDBM}}
database instances. The line numbers shown are provided for
reference only and are not included in the actual file. First, the
global configuration section:

E:  1.	# example config file - global configuration section
E:  2.	include /usr/local/etc/schema/core.schema
E:  3.	referral ldap://root.openldap.org
E:  4.	access to * by * read
 
Line 1 is a comment. Line 2 includes another config file
which containing {{core}} schema definitions.
The {{EX:referral}} directive on line 3
means that queries not local to one of the databases defined
below will be referred to the LDAP server running on the
standard port (389) at the host {{EX:root.openldap.org}}.

Line 4 is a global access control.  It is used only if
no database access controls match or when the target
objects are not under the control of any database (such as
the Root DSE).

The next section of the configuration file defines an LDBM
backend that will handle queries for things in the
"dc=example,dc=com" portion of the tree. The
database is to be replicated to two slave slapds, one on
truelies, the other on judgmentday. Indexes are to be
maintained for several attributes, and the {{EX:userPassword}}
attribute is to be protected from unauthorized access.

E:  5.	# ldbm definition for the example.com
E:  6.	database ldbm
E:  7.	suffix "dc=example, dc=com"
E:  8.	directory /usr/local/var/openldap
E:  9.	rootdn "cn=Manager, dc=example, dc=com"
E: 10.	rootpw secret
E: 11.	# replication directives
E: 12.	replogfile /usr/local/var/openldap/slapd.replog
E: 13.	replica host=slave1.example.com:389
E: 14.		binddn="cn=Replicator, dc=example, dc=com"
E: 15.		bindmethod=simple credentials=secret
E: 16.	replica host=slave2.example.com
E: 17.		binddn="cn=Replicator, dc=example, dc=com"
E: 18.		bindmethod=simple credentials=secret
E: 19.	# indexed attribute definitions
E: 20.	index uid pres,eq
E: 21.	index cn,sn,uid pres,eq,approx,sub
E: 22.	index objectClass eq
E: 23.	# ldbm access control definitions
E: 24.	access to attr=userPassword
E: 25.		by self write
E: 26.		by anonymous auth
E: 27.		by dn="cn=Admin,dc=example,dc=com" write
E: 28.		by * none
E: 29.	access to *
E: 30.		by self write
E: 31.		by dn="cn=Admin,dc=example,dc=com" write
E: 32.		by * read

Line 5 is a comment. The start of the database definition is
marked by the database keyword on line 6. Line 7 specifies
the DN suffix for queries to pass to this database. Line 8
specifies the directory in which the database files will live.

Lines 9 and 10 identify the database "super user" entry and
associated password. This entry is not subject to access
control or size or time limit restrictions.

Lines 11 through 18 are for replication. Line 11 specifies the
replication log file (where changes to the database are logged
\- this file is written by slapd and read by slurpd). Lines 12 
through 14 specify the hostname and port for a replicated
host, the DN to bind as when performing updates, the bind
method (simple) and the credentials (password) for the
binddn. Lines 15 through 18 specify a second replication site.
See the {{SECT:Replication with slurpd}} chapter for more
information on these directives.

Lines 20 through 22 indicate the indexes to maintain for
various attributes.

Lines 24 through 32 specify access control for entries in the
database. For all entries, the {{EX:userPassword}} attribute is
writable by the entry itself and by the "admin" entry.  It may be
used for authentication/authorization purposes, but is otherwise
not readable.  All other attributes are writable by the entry and
the "admin" entry, but may be read by authenticated users.

The next section of the example configuration file defines
another LDBM database. This one handles queries involving
the {{EX:dc=example,dc=net}} subtree.  Note that without
line 38, the read access would be allowed due to the
global access rule at line 4.

E: 33.	# ldbm definition for example.net
E: 34.	database ldbm
E: 35.	suffix "dc=example, dc=net"
E: 36.	directory /usr/local/var/ldbm-example-net
E: 37.	rootdn "cn=Manager, dc=example, dc=com"
E: 38.	access to * by users read