RHEL6 Openldap Server

RHEL6 openldap server configuration step by step

Step 1: first we need to install the required packages:

#yum install openldap-servers migrationtools

Step2:As the configuration for LDAP is stored inside the LDAP server itself the configuration has to be done by editing LDIF files under the/etc/openldap/slapd.d/directory.

Now create the ldap password:

#slappasswd

youll get something like this {SSHA}r2or9f2vYlvieCu0LP6wTnSdYfrddsuV as a result. This is the string we will have to add to the bdb.ldif config file.

# vim/etc/openldap/slapd.d/cn\=config/olcDatabase\=\{1\}bdb.ldif

substitute my-domain.com with yourdomain.com

:%s/dc=my-domain,dc=com/dc=yourdmain,dc=com/g

Step 3:We now set the admin password and specify the location of our encryption certificate and key.

add these 3 lines at the end of the file bdb.ldif file:

olcRootPW: {SSHA}r2or9f2vYlvieCu0LP6wTnSdYfrddsuVolcTLSCertificateFile: /etc/pki/tls/certs/slapdcert.pemolcTLSCertificateKeyFile: /etc/pki/tls/certs/slapdkey.pem

Step 4:Now we have to specify the monitoring privileges

#vim/etc/openldap/slapd.d/cn\=config/olcDatabase\=\{2\}monitor.ldif

again, we have to replace the default domain name with our domain name

:%s/cn=manager,dc=my-domain,dc=com/cn=Manager,dc=yourdomain,dc=com/g

Step 5:Now its time for the Database Cache

#updatedb#cp/usr/share/doc/openldap-servers-2.4.19/DB_CONFIG.example/var/lib/ldap/DB_CONFIG#chown -Rf ldap:ldap/var/lib/ldap/

Step 6:Now we will need to set up a certificate for TLS. First we need to edit /etc/sysconfig/ldap and change SLAPD_LDAPS from no to yes.

#vi /etc/sysconfig/ldapSLAPD_LDAPS=yes

Now we can create the certificate

#openssl req -new -x509 -nodes -out /etc/pki/tls/certs/slapdcert.pem -keyout /etc/pki/tls/certs/slapdkey.pem -days 365

This will create the two required keys in the /etc/pki/tls/certs/ directory. We need to make them readable for the ldap user.

# chown -Rf root:ldap /etc/pki/tls/certs/$cert.pem# chmod -Rf 750 /etc/pki/tls/certs/$key.pem

Step 7:Time to test our configuration

# slaptest -u

config file testing succeeded

Step 8:Start the ldap server

#service sladp start

lets check if our ldap server really works:

#ldapsearch -x -b dc=yourdomain,dc=com

if you get a search: 2 then your on track!

Step 9:Configure the base domain

#vi base.ldifdn: dc=yourdomain,dc=netdc: yourdomainobjectClass: topobjectClass: domaindn: ou=People,dc=yourdomain,dc=netou: PeopleobjectClass: topobjectClass: organizationalUnitdn: ou=Group,dc=yourdomain,dc=netou: GroupobjectClass: topobjectClass: organizationalUnit

now we import our base information to the ldap directory:

#ldapadd -x -W -D cn=Manager,dc=yourdomain,dc=com -f base.ldif

Step 10:lets migrate the users

Go to the directory /usr/share/migrationtools. Edit the file# vim /usr/share/migrationtools/migrate_common.phSet:

# Default DNS domain$DEFAULT_MAIL_DOMAIN = yourdomain.com;# Default base$DEFAULT_BASE = dc=yourdomain,dc=com;#grep :5[0-9][0-9] /etc/passwd > passwd#grep :5[0-9][0-9] /etc/group > group#./migrate_passwd.pl passwd > users.ldif#./migrate_group.pl group > group.ldif#sed -e s/ou=Group/ou=Groups/g group.ldif > groups.ldifldapadd -x -W -D cn=Manager,dc=yourdomain,dc=com -f users.ldifldapadd -x -W -D cn=Manager,dc=yourdomain,dc=com -f groups.ldif

Step 11:Testing the ldap server. We check if user mani exists#ldapsearch -x cn=mani -b dc=mycompany,dc=com

If the test is successful your done :)

************************All The Best*******************regards cnuvasan

OpenLDAP is an opensource implementation of Lightweight Directory Access Protocal.Read moreabout OpenLDAP Project. I am using CentOS 5 for configuring OpenLDAP server. Below are the steps which I have performed during configuration. This article will help you step by step to Install and Configure OpenLDAP Server.

Network Details: Below is the network details used while writing this article.

System name: openldap.example.com

System IP: 192.168.10.50

Domain Name: example.com

Step 1: Create Test AccountsFirsty create two test user accounts in your linux system using following commnands.

# useradd ldapuser1

# useradd ldapuser2

# passwd ldapuser1

# passwd ldapuser2

Step 2: Install Requird PackagesBelow is list of software required for setup openldap

compat-openldap

openldap-clients

openldap-devel

openldap-servers

openldap-servers-sql

Install all packages using following command.

# yum install *openldap* -y

Step 3: Setup OpenLDAP root PasswordAfter installing openldap packages, First create OpenLDAP root user password

# slappasswd

New password:

Re-enter new password:

{SSHA}BONOBgJZNZc3A+UFq3fcjRn2YHsZVkXw

Step 4:Edit Configuration FileEdit openldap configuration file with new values , use rootpw value get from slappasswd command in above step

# vi /etc/openldap/slapd.conf

database bdb

suffix "dc=example,dc=com"

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

rootpw {SSHA}BONOBgJZNZc3A+UFq3fcjRn2YHsZVkXw

Step 5:Setup LDAP Database FileCopye example LDAP database file at below location. Use given example file from openldap

# cp /etc/openldap/DB_CONFIG.example /var/lib/ldap/DB_CONFIG

Step 6 Start ServicesStart openldap service and setup service to auto start on system boot

# service ldap start

# chkconfig ldap on

Step 7: Create Domain LDIF FileNow Create ldif (LDAP Data Interchange Format) file for your domainexample.com, You can use any filename with extension ldif

# vim /etc/openldap/base.ldif

dn: dc=example,dc=com

dc: example

objectClass: top

objectClass: domain

dn: ou=users,dc=example,dc=com

ou: users

objectClass: top

objectClass: organizationalUnit

dn: ou=Group,dc=example,dc=com

ou: Group

objectClass: top


Step 8: Create Users LDIF FileAfter creating ldif file for your domain, Let create ldif file for all test users.

# cd /usr/share/openldap/migration/

# grep root /etc/passwd > /etc/openldap/passwd.root

# grep ldapuser1 /etc/passwd > /etc/openldap/passwd.ldapuser1

# grep ldapuser2 /etc/passwd > /etc/openldap/passwd.ldapuser2

# ./migrate_passwd.pl /etc/openldap/passwd.root /etc/openldap/root.ldif

# ./migrate_passwd.pl /etc/openldap/passwd.ldapuser1 /etc/openldap/ldapuser1.ldif

# ./migrate_passwd.pl /etc/openldap/passwd.ldapuser1 /etc/openldap/ldapuser2.ldif

Step 9: Edit Users LDIF FilesModify all LDIF files created for users as per below given example for ldapuser1.

# vim /etc/openldap/ldapuser1.ldif

dn: uid=ldapuser1,dc=example,dc=com

uid: ldapuser1

cn: ldapuser1

objectClass: account

objectClass: posixAccount

objectClass: top

objectClass: shadowAccount

objectClass: radiusprofile

description: 802.1x user

radiusFilterId: "Enterasys:version=1:policy=Enterprise User"

userPassword: {crypt}$1$rN6WLraT$9skdu7BpRUM6v7DiEhQXt1

shadowLastChange: 15419

shadowMin: 0

shadowMax: 99999

shadowWarning: 7

loginShell: /bin/bash

uidNumber: 612

gidNumber: 612

homeDirectory: /home/ldapuser1

Note:Make sure you have added below 3 file in ldif for integrating radius-ldap authentication

objectClass: radiusprofile

description: 802.1x user

radiusFilterId: Enterasys:version=1:policy=Enterprise User

Step 10: Import All DataImport all Data from configuration files to LDAP databaseImporting base.ldif:# ldapadd -x -D "cn=Manager,dc=example,dc=com" -W -f /etc/openldap/base.ldif

Enter LDAP Password:

adding new entry "dc=example,dc=com"

adding new entry "ou=users,dc=example,dc=com"

adding new entry "ou=Group,dc=example,dc=com"

Importing root.ldif:# ldapadd -x -D "cn=Manager,dc=example,dc=com" -W -f /etc/openldap/root.ldif


adding new entry "uid=root,ou=users,dc=example,dc=com"

adding new entry "uid=operator,ou=users,dc=example,dc=com"

Importing ldapuser1.ldif:# ldapadd -x -D "cn=Manager,dc=example,dc=com" -W -f /etc/openldap/ldapuser1.ldif


adding new entry "uid=ldapuser1,ou=users,dc=example,dc=com"

Importing ldapuser2.ldif:# ldapadd -x -D "cn=Manager,dc=example,dc=com" -W -f /etc/openldap/ldapuser2.ldif


adding new entry "uid=ldapuser2,ou=users,dc=example,dc=com"

Step 11: Restart LDAP ServiceStop and Start LDAP service using following command.

# /etc/init.d/ldap stop

# /etc/init.d/ldap start

Step 12: Test Your SetupYou setup has been completed, Lets test your ldap server using ldapsearch

# ldapsearch -x -b 'dc=example,dc=com' '(objectclass=*)'

CongratulationsYour ldap setup has been completed. Read our next articleSetup FreeRadius Authentication with OpenLDAPInstall OpenLDAP

[root@master ~]#yum-y install openldap-servers openldap-clients

[root@master ~]#vi/etc/sysconfig/ldap# line 16: uncomment and change

SLAPD_LDAPI=

yes

[root@master ~]#vi/etc/openldap/slapd.conf# create new

pidfile /var/run/openldap/slapd.pid

argsfile /var/run/openldap/slapd.args

[root@master ~]#rm-rf /etc/openldap/slapd.d/*

[root@master ~]#slaptest -f /etc/openldap/slapd.conf -F /etc/openldap/slapd.d

config file testing succeeded[root@master ~]#vi/etc/openldap/slapd.d/cn=config/olcDatabase\={0}config.ldif# line 4: change

olcAccess:{0}to * by dn.exact=gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth manage by * break

[root@master ~]#vi/etc/openldap/slapd.d/cn=config/olcDatabase\={2}monitor.ldif# create new

dn: olcDatabase={2}monitorobjectClass: olcDatabaseConfigolcDatabase: {2}monitorolcAccess: {0}to * by dn.exact=gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth manage by * breakolcAddContentAcl: FALSEolcLastMod: TRUEolcMaxDerefDepth: 15olcReadOnly: FALSEolcMonitoring: FALSEstructuralObjectClass: olcDatabaseConfigcreatorsName: cn=configmodifiersName: cn=config

[root@master ~]#chown-R ldap. /etc/openldap/slapd.d

[root@master ~]#chmod-R 700 /etc/openldap/slapd.d

[root@master ~]#/etc/rc.d/init.d/slapd start

Starting slapd: [ OK ][root@master ~]#chkconfigslapd on

[2]Initial Configuration

[root@master ~]#ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/core.ldif

SASL/EXTERNAL authentication startedSASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=authSASL SSF: 0adding new entry "cn=core,cn=schema,cn=config"[root@master ~]#ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/cosine.ldif

SASL/EXTERNAL authentication startedSASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=authSASL SSF: 0adding new entry "cn=cosine,cn=schema,cn=config"

[root@master ~]#ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/nis.ldif

SASL/EXTERNAL authentication startedSASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=authSASL SSF: 0adding new entry "cn=nis,cn=schema,cn=config"

[root@master ~]#ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/inetorgperson.ldif

SASL/EXTERNAL authentication startedSASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=authSASL SSF: 0adding new entry "cn=inetorgperson,cn=schema,cn=config"

[root@master ~]#slappasswd# generate password

New password:

# input any one

Re-enter new password:{SSHA}xxxxxxxxxxxxxxxxxxxxxxxx

[root@master ~]#vibackend.ldif# create new

# replace the section "dc=***,dc=***" to your own suffix

# replace the section "olcRootPW: ***" to your own password generated by slappasswd above

dn: cn=module,cn=config

objectClass: olcModuleList

cn: module

olcModulepath: /usr/lib64/openldap

olcModuleload: back_hdb

dn: olcDatabase=hdb,cn=config

objectClass: olcDatabaseConfig

objectClass: olcHdbConfig

olcDatabase: {1}hdb

olcSuffix: dc=server,dc=world

olcDbDirectory: /var/lib/ldap

olcRootDN: cn=admin,dc=server,dc=world

olcRootPW: {SSHA}xxxxxxxxxxxxxxxxxxxxxxxx

olcDbConfig: set_cachesize 0 2097152 0

olcDbConfig: set_lk_max_objects 1500

olcDbConfig: set_lk_max_locks 1500

olcDbConfig: set_lk_max_lockers 1500

olcDbIndex: objectClass eq

olcLastMod: TRUE

olcMonitoring: TRUE

olcDbCheckpoint: 512 30

olcAccess: to attrs=userPassword by dn="cn=admin,dc=server,dc=world" write by anonymous auth by self write by * none

olcAccess: to attrs=shadowLastChange by self write by * read

olcAccess: to dn.base="" by * read

olcAccess: to * by dn="cn=admin,dc=server,dc=world" write by * read

[root@master ~]#ldapadd -Y EXTERNAL -H ldapi:/// -f backend.ldif

SASL/EXTERNAL authentication startedSASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=authSASL SSF: 0adding new entry "cn=module,cn=config"

adding new entry "olcDatabase=hdb,cn=config"

[root@master ~]#vifrontend.ldif# create new

# replace the section "dc=***,dc=***" to your own suffix

# replace the section "userPassword: ***" to your own password generated by slappasswd above

dn: dc=server,dc=world

objectClass: top

objectClass: dcObject

objectclass: organization

o: Server World

dc: Server

dn: cn=admin,dc=server,dc=world

objectClass: simpleSecurityObject

objectClass: organizationalRole

cn: admin

userPassword: {SSHA}xxxxxxxxxxxxxxxxxxxxxxxx

dn: ou=people,dc=server,dc=world


ou: people

dn: ou=groups,dc=server,dc=world


ou: groups

[root@master ~]#ldapadd -x -D cn=admin,dc=server,dc=world -W -f frontend.ldif


# password you set

adding new entry "dc=server,dc=world"

adding new entry "cn=admin,dc=server,dc=world"

adding new entry "ou=people,dc=server,dc=world"

adding new entry "ou=groups,dc=server,dc=world"

[3]Add Existing local Users to LDAP Directory

[root@master ~]#vildapuser.sh# extract local users who have 500-999 digit UID

# replace "SUFFIX=***" to your own suffix

# this is an example

#!/bin/bash

SUFFIX='dc=server,dc=world'

LDIF='ldapuser.ldif'

echo -n > $LDIF

for line in `grep "x:[5-9][0-9][0-9]:" /etc/passwd | sed -e "s/ /%/g"`

do

UID1=ècho $line | cut -d: -f1`

NAME=ècho $line | cut -d: -f5 | cut -d, -f1`

if [ ! "$NAME" ]

then

NAME=$UID1

else

NAME=ècho $NAME | sed -e "s/%/ /g"`

fi

SN=ècho $NAME | awk '{print $2}'`

if [ ! "$SN" ]

then

SN=$NAME

fi

GIVEN=ècho $NAME | awk '{print $1}'`

UID2=ècho $line | cut -d: -f3`

GID=ècho $line | cut -d: -f4`

PASS=`grep $UID1: /etc/shadow | cut -d: -f2`

SHELL=ècho $line | cut -d: -f7`

HOME=ècho $line | cut -d: -f6`

EXPIRE=`passwd -S $UID1 | awk '{print $7}'`

FLAG=`grep $UID1: /etc/shadow | cut -d: -f9`

if [ ! "$FLAG" ]

then

FLAG="0"

fi

WARN=`passwd -S $UID1 | awk '{print $6}'`

MIN=`passwd -S $UID1 | awk '{print $4}'`

MAX=`passwd -S $UID1 | awk '{print $5}'`

LAST=`grep $UID1: /etc/shadow | cut -d: -f3`

echo "dn: uid=$UID1,ou=people,$SUFFIX" >> $LDIF

echo "objectClass: inetOrgPerson" >> $LDIF

echo "objectClass: posixAccount" >> $LDIF

echo "objectClass: shadowAccount" >> $LDIF

echo "uid: $UID1" >> $LDIF

echo "sn: $SN" >> $LDIF

echo "givenName: $GIVEN" >> $LDIF

echo "cn: $NAME" >> $LDIF

echo "displayName: $NAME" >> $LDIF

echo "uidNumber: $UID2" >> $LDIF

echo "gidNumber: $GID" >> $LDIF

echo "userPassword: {crypt}$PASS" >> $LDIF

echo "gecos: $NAME" >> $LDIF

echo "loginShell: $SHELL" >> $LDIF

echo "homeDirectory: $HOME" >> $LDIF

echo "shadowExpire: $EXPIRE" >> $LDIF

echo "shadowFlag: $FLAG" >> $LDIF

echo "shadowWarning: $WARN" >> $LDIF

echo "shadowMin: $MIN" >> $LDIF

echo "shadowMax: $MAX" >> $LDIF

echo "shadowLastChange: $LAST" >> $LDIF

echo >> $LDIF

done

[root@master ~]#sh ldapuser.sh

[root@master ~]#ldapadd -x -D cn=admin,dc=server,dc=world -W -f ldapuser.ldif


# LDAP admin password

adding new entry "uid=fermi,ou=people,dc=server,dc=world"

adding new entry "uid=cent,ou=people,dc=server,dc=world"

adding new entry "uid=ubuntu,ou=people,dc=server,dc=world"

adding new entry "uid=debian,ou=people,dc=server,dc=world"

adding new entry "uid=fedora,ou=people,dc=server,dc=world"

[4]Add existing local groups to LDAP directory.

[root@master ~]#vildapgroup.sh# extract local groups who have 500-999 digit UID

# replace "SUFFIX=***" to your own suffix

# this is an example

#!/bin/bash

SUFFIX='dc=server,dc=world'

LDIF='ldapgroup.ldif'

echo -n > $LDIF

for line in `grep "x:[5-9][0-9][0-9]:" /etc/group`

do

CN=ècho $line | cut -d: -f1`

GID=ècho $line | cut -d: -f3`

echo "dn: cn=$CN,ou=groups,$SUFFIX" >> $LDIF

echo "objectClass: posixGroup" >> $LDIF

echo "cn: $CN" >> $LDIF

echo "gidNumber: $GID" >> $LDIF

users=ècho $line | cut -d: -f4 | sed "s/,/ /g"`

for user in ${users} ; do

echo "memberUid: ${user}" >> $LDIF

done

echo >> $LDIF

done

[root@master ~]#sh ldapgroup.sh

[root@master ~]#ldapadd -x -D cn=admin,dc=server,dc=world -W -f ldapgroup.ldif


# LDAP admin password

adding new entry "cn=fermi,ou=groups,dc=server,dc=world"

adding new entry "cn=cent,ou=groups,dc=server,dc=world"

adding new entry "cn=ubuntu,ou=groups,dc=server,dc=world"

adding new entry "cn=debian,ou=groups,dc=server,dc=world"

adding new entry "cn=fedora,ou=groups,dc=server,dc=world"

[5]If you'd like to delete User or Group in LDAP, Do as below.

[root@master ~]#ldapdelete -x -W -D 'cn=admin,dc=server,dc=world' "uid=cent,ou=people,dc=server,dc=world"

Enter LDAP Password:[root@master ~]#ldapdelete -x -W -D 'cn=admin,dc=server,dc=world' "cn=cent,ou=groups,dc=server,dc=world"


LDAP Server

Documents

RHEL6 Openldap Server