An LDAP Client Library for Dart

This library is used to implement LDAP v3 clients.

The Lightweight Directory Access Protocol (LDAP) is a protocol for accessing directories. These directories are organised as a hierarchy of entries, where one or more root entries are allowed. Each entry contains a set of attribute and values. Each entry can be identified by a distinguished name, which is a sequence of attribute/value pairs. The LDAP protocol can be used to query, as well as modify, these directories.

This library supports the LDAP v3 protocol, which is defined in IETF RFC 4511.

The LDAP operations supported by this implementation include: bind, add, modify, delete, modify, search and compare.


Create an LDAP connection and perform a simple search using it.

This example first creates an LDAPConfiguration object with the settings for connecting to the LDAP server. It then gets the LDAPConnection object using those settings (i.e. performs an LDAP bind operation). With the connection, it performs an LDAP search operation. The search operation produces a stream of SearchResult objects: in this example, the entries are each printed out along with a total count at the end.

To perform an anonymous bind, leave out the bindDN and password.

import 'package:dartdap/dartdap.dart';

void main() {
  var ldapConfig = new LDAPConfiguration("",
                                         ssl: false, 
                                         bindDN: "cn=admin,dc=example,dc=com",
                                         password: "[email protected]");

  ldapConfig.getConnection().then((LDAPConnection ldap) {
    var base = "dc=example,dc=com";
    var filter = Filter.present("objectClass");
    var attrs = ["dn", "cn", "objectClass"];

    print("LDAP Search: baseDN=\"${base}\", attributes=${attrs}");

    var count = 0;, filter, attrs).stream.listen(
        (SearchEntry entry) => print("${++count}: $entry"),
        onDone: () => print("Found ${count} entries"));

See the integration test for more examples.


This package uses the Dart logging package for logging.

Loggers used

Logger: ldap.control

  • finest = parsing of controls

Logger: ldap.session

  • warnings = certificate issues
  • fine = connections successfully established, and closing them
  • finer = details about attempts to establish a connection

Logger: ldap.send.ldap

Logging the LDAP messages sent.

  • fine = LDAP messages sent.
  • finest = details of LDAP message construction

Logger: ldap.recv.ldap

Logging the LDAP messages received (i.e. received ASN.1 objects processed as LDAP messages).

  • fine = LDAP messages received.
  • finer = LDAP messages processing.

Logger: ldap.recv.asn1

Logging the ASN.1 objects received (i.e. parsed from the raw bytes received). Probably only useful when debugging the dartdap package.

  • fine = ASN.1 messages successfully parsed from the raw bytes
  • finest = shows the actual bytes making up the value of the ASN.1 message

Logger: ldap.recv.bytes

Logging the raw bytes received from the socket. Probably only useful when debugging the dartdap package.

  • fine = number of bytes raw read
  • finer = parsing activity of converting the bytes into ASN.1 objects
  • finest = shows the actual bytes received and the number in the buffer to parse


To take advantage of the hierarchy of loggers, enable hierarchicalLoggingEnabled and set the logging level on individual loggers. If the logging level is not explicitly set on a logger, it is inherited from its parent. The root logger is the ultimate parent; and its logging level is initally Level.INFO.

For example, to view high level connection and LDAP messages send/received:

import 'package:logging/logging.dart';


Logger.root.onRecord.listen((LogRecord rec) {
  print('${rec.time}: ${rec.loggerName}: ${}: ${rec.message}');

hierarchicalLoggingEnabled = true;

new Logger("ldap.session").level = Level.FINE;
new Logger("ldap.send.ldap").level = Level.FINE;
new Logger("ldap.recv.ldap").level = Level.FINE;

To debug messages received:

new Logger("ldap.recv.ldap").level = Level.ALL;
new Logger("ldap.recv.asn1").level = Level.FINER;
new Logger("ldap.recv.bytes").level = Level.FINE;

Note: in the above examples: SHOUT, SEVERE, WARNING and INFO will still be logged (except for those loggers and their children where the level has been set to Level.OFF). To disable those log messages change the root logger from its default of Level.INFO to Level.OFF.

For example, to suppress all log messages (including suppressing SHOUT, SEVERE, WARNING and INFO):

Logger.root.level = Level.OFF;

Or leave the root level at the default and only disable logging from the package:

new Logger("ldap").level = Level.OFF;


  • Documentation. For now please see integration_test.dart for sample usage
  • Improve conciseness / usability of API
  • Paged search
  • VLV Search. See
  • An LDIF parser would be nice for creating integration test data
  • Do we need to implement flow control so the client does not overwhelm the server?



Classes for implementing LDAP v3 clients.