OpenLDAP Installation and Configuration in Ubuntu 12.10/13.04/13.10 And Debian 6/7

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OpenLDAP is a free open source Light Weight Directory Access protocol developed by the OpenLDAP project. It is a platform independent protocol, so that it runs on all Linux/Unix like systems, Windows, AIX, Solaris and Android.

In this tutorial i am going to describe how to install and configure OpenLDAP in Ubuntu / Debian server. Due to lack of resources and time, i tested this how-to only on Ubuntu 12.10/13.10 and Debian 7. I hope these steps will work on other version of Ubuntu and Debian. If you have any issues, do let me know, i will check and update this how-to.

Well, let us begin to setup LDAP server.

Operating System : Debian 7 Server
Hostname         : server.unixmen.com
IP Address       : 192.168.1.200

Replace the above values with your own.

Install OpenLDAP in Ubuntu/Debian

Enter the following command in Terminal to install openldap.

All steps must be done using ‘root’ user or you should use ‘sudo’ in-front of every command.

# apt-get install slapd ldap-utils

During the installation it will ask the password for LDAP admin account. Enter your admin password here.

sk@sk: ~_001Re-enter the password.

sk@sk: ~_002Configure OpenLDAP

Open the “/etc/ldap/ldap.conf” file,

# vi /etc/ldap/ldap.conf

Find, uncomment and edit the lines as shown below with your domain name and IP Address.

#
# LDAP Defaults
#
# See ldap.conf(5) for details
# This file should be world readable but not world writable.
BASE    dc=unixmen,dc=com
URI     ldap://server.unixmen.com ldap://server.unixmen.com:666
#SIZELIMIT      12
#TIMELIMIT      15
#DEREF          never
# TLS certificates (needed for GnuTLS)
TLS_CACERT      /etc/ssl/certs/ca-certificates.crt

Run the Configuration assistant.

# dpkg-reconfigure slapd

The following screen should appear. Select “No” and press Enter.

sk@sk: ~_003Enter the DNS domain name.

sk@sk: ~_004Enter the Organization name(i.e your company name).

sk@sk: ~_005Enter the LDAP admin password which you created in the earlier step.

sk@sk: ~_006Re-enter the password.

sk@sk: ~_007Select the backend database.

sk@sk: ~_008Select Yes or No to delete the database automatically when we are planning to remove LDAP server later. Here i want to keep my old database, hence i clicked No.

sk@sk: ~_009Select Yes to move old database.

sk@sk: ~_010Select No and Press Enter.

sk@sk: ~_011LDAP server is up and running now.

Test LDAP Server

Enter the following command “ldapsearch -x”, then you will have the following result.

# ldapsearch -x

Sample output:

# extended LDIF
#
# LDAPv3
# base <dc=unixmen,dc=com> (default) with scope subtree
# filter: (objectclass=*)
# requesting: ALL
#

# unixmen.com
dn: dc=unixmen,dc=com
objectClass: top
objectClass: dcObject
objectClass: organization
o: unixmen
dc: unixmen

# admin, unixmen.com
dn: cn=admin,dc=unixmen,dc=com
objectClass: simpleSecurityObject
objectClass: organizationalRole
cn: admin
description: LDAP administrator

# search result
search: 2
result: 0 Success

# numResponses: 3
# numEntries: 2

LDAP Server Administration

Administration of LDAP server in command mode is quite difficult, so that here i have used a easier GUI administration tool called “phpldapadmin”.

Install phpLDAPadmin

phpLDAPadmin is a web-based LDAP administration tool for managing your LDAP server. Using phpLDAPadmin, you can browse your LDAP tree, view LDAP schema, perform searches, create, delete, copy and edit LDAP entries. You can even copy entries between servers.

Enter the following command to install phpLDAPAdmin

# apt-get install phpldapadmin

Create a symbolic link for phpldapadmin directory.

# ln -s /usr/share/phpldapadmin/ /var/www/phpldapadmin

Now open the “/etc/phpldapadmin/config.php” file,

# vi /etc/phpldapadmin/config.php

and replace the domain names with your own values. Goto “Define LDAP Servers” section in the config file and edit the following lines as shown below.

[...]
// Uncomment and set your timezone //
$config->custom->appearance['timezone'] = 'Asia/Kolkata';
[...]
// Set your LDAP server name //
$servers->setValue('server','name','Unixmen LDAP Server');
[...]
// Set your LDAP server IP address // 
$servers->setValue('server','host','192.168.1.200');
[...]
// Set Server domain name //
$servers->setValue('server','base',array('dc=unixmen,dc=com'));
[...]
// Set Server domain name //
$servers->setValue('login','bind_id','cn=admin,dc=unixmen,dc=com');
[...]

Restart the apache service.

# /etc/init.d/apache2 restart

Make sure that you have opened apache server port “80″ and LDAP default port “389″ in your firewall/router configuration.

$ sudo ufw allow 80
Rules updated
Rules updated (v6)
$ sudo ufw allow 389
Rules updated
Rules updated (v6)

The above steps are not necessary for Debian systems.

Test phpLDAPadmin

Now point your web browser with “http://192.168.1.200/phpldapadmin”. The following screen should appear.

phpLDAPadmin (1.2.2) - - Mozilla Firefox_012Click “login” on the left pane and make sure the domain details are correct and enter ldap admin password which you have created in the previous steps and press “Authenticate”.

phpLDAPadmin (1.2.2) - - Mozilla Firefox_014Now the main console screen of phpldapadmin will open. You can see the LDAP domain “unixmen.com” will be found there. From here you can add objects such as Organizational Unit, Users and groups etc.

phpLDAPadmin (1.2.2) - - Mozilla Firefox_015Sample Configuration

Create Organizational Unit:

Lets create some sample objects using phpldapadmin interface and check them whether they are present in the LDAP server configuration.

Click on the “+” sign near the line “dc=unixmen” and click “Create new entry here” link.

Selection_016Select “Generic-Organizational Unit” and enter the name of the Organizational unit(Ex.sales) and Click “Create Object”.

phpLDAPadmin (1.2.2) - - Mozilla Firefox_017And then click “Commit”.

phpLDAPadmin (1.2.2) - - Mozilla Firefox_018Now the newly created OU will be found under the main ldap domain.

Selection_019

Create Group:

Click on the sales ou tree on the left pane and click on “Create a child entry” link.

Selection_020In the next window, Select “Generic: Posix Group”. Enter the name of the group and click Create Object button. For example here i enter the group name as “sales-group”.

phpLDAPadmin (1.2.2) - - Mozilla Firefox_002Click Commit to save changes.

phpLDAPadmin (1.2.2) - - Mozilla Firefox_003Now you can see that the newly created group called “sales-group” will be found under sales ou.

Selection_004Create User:

Click on the sales-group on the left and select Create a child entry link button.

Selection_005Select “Generic: User Account”. Enter the user details such as common name, GID number, last name, Login shell, user password and user id etc., as shown in the below screen shot and click Create object. For example here i create a user called “kumar”.

phpLDAPadmin (1.2.2) - - Mozilla Firefox_007And then Click “Commit” to save the changes.

phpLDAPadmin (1.2.2) - - Mozilla Firefox_008Now the newly created user “kumar” will be found under “sales-group” object.

Selection_009Also you can verify using the command “ldapsearch -x”.

# ldapsearch -x

Sample output:

# extended LDIF
#
# LDAPv3
# base <dc=unixmen,dc=com> (default) with scope subtree
# filter: (objectclass=*)
# requesting: ALL
#

# unixmen.com
dn: dc=unixmen,dc=com
objectClass: top
objectClass: dcObject
objectClass: organization
o: unixmen
dc: unixmen

# admin, unixmen.com
dn: cn=admin,dc=unixmen,dc=com
objectClass: simpleSecurityObject
objectClass: organizationalRole
cn: admin
description: LDAP administrator

# sales, unixmen.com
dn: ou=sales,dc=unixmen,dc=com
objectClass: organizationalUnit
objectClass: top
ou: sales

# sales-group, sales, unixmen.com
dn: cn=sales-group,ou=sales,dc=unixmen,dc=com
gidNumber: 500
cn: sales-group
objectClass: posixGroup
objectClass: top

# kumar, sales-group, sales, unixmen.com
dn: cn=kumar,cn=sales-group,ou=sales,dc=unixmen,dc=com
cn:: IGt1bWFy
gidNumber: 500
homeDirectory: /home/users/kumar
sn: kumar
loginShell: /bin/sh
objectClass: inetOrgPerson
objectClass: posixAccount
objectClass: top
uidNumber: 1000
uid: kumar

# search result
search: 2
result: 0 Success

# numResponses: 6
# numEntries: 5

Now OpenLDAP Server is ready to use. Good Luck!

So you have installed LDAP server, what now? Please refer next article How To Configure Linux Clients To Authenticate Using OpenLDAP.

For questions please refer to our Q/A forum at : http://ask.unixmen.com/

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