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Configure LDAP Server2015/01/13
 
Configure LDAP Server in order to share users' accounts in your local networks.
[1] Install OpenLDAP.
[root@dlp ~]#
yum -y install openldap-servers openldap-clients
# generate a password for ldap admin

[root@dlp ~]#
slappasswd

New password:
Re-enter new password:
{SSHA}*********************
[root@dlp ~]#
vi /etc/openldap/slapd.conf
# line 86: specify suffix

suffix   "dc=
srv
,dc=
world
"
# line 87: specify admin suffix

rootdn   "cn=Manager,dc=
srv
,dc=
world
"
# line 93: specify the password just generated above

rootpw   {SSHA}************************
# add follows to the end

access to attrs=userPassword
    by self write
    by dn="cn=Manager,dc=srv,dc=world" write
    by anonymous auth
    by * none

access to *
    by dn="cn=Manager,dc=srv,dc=world" write
    by self write
    by * read
[root@dlp ~]#
cp /etc/openldap/DB_CONFIG.example /var/lib/ldap/DB_CONFIG

[root@dlp ~]#
/etc/rc.d/init.d/ldap start

Checking configuration files for slapd: /etc/openldap/slapd.conf: line 115: rootdn is always granted unlimited privileges.
/etc/openldap/slapd.conf: line 120: rootdn is always granted unlimited privileges.
config file testing succeeded
[ OK ]
Starting slapd: [ OK ]
[root@dlp ~]#
chkconfig ldap on
[2] Add initial information.
[root@dlp ~]#
vi base.ldif
# create new

# replace "dc=xxx,dc=xxx" to your suffix

dn: dc=srv,dc=world
dc: srv
objectClass: top
objectClass: domain

dn: ou=People,dc=srv,dc=world
ou: People
objectClass: top
objectClass: organizationalUnit

dn: ou=Group,dc=srv,dc=world
ou: Group
objectClass: top
objectClass: organizationalUnit
[root@dlp ~]#
ldapadd -x -W -D "cn=Manager,dc=srv,dc=world" -f base.ldif

Enter LDAP Password:
# LDAP admin password

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

adding new entry "ou=People,dc=srv,dc=world"

adding new entry "ou=Group,dc=srv,dc=world"
[3] Add Existing local Users to LDAP Directory.
[root@dlp ~]#
vi ldapuser.sh
# extract local users who have 500-999 digit UID
# replace "SUFFIX=***" to your own suffix
# this is an example

#!/bin/bash

SUFFIX='dc=srv,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=`echo $line | cut -d: -f1`
   NAME=`echo $line | cut -d: -f5 | cut -d, -f1`
   if [ ! "$NAME" ]
   then
      NAME=$UID1
   else
      NAME=`echo $NAME | sed -e "s/%/ /g"`
   fi
   SN=`echo $NAME | awk '{print $2}'`
   if [ ! "$SN" ]
   then
      SN=$NAME
   fi
   GIVEN=`echo $NAME | awk '{print $1}'`
   UID2=`echo $line | cut -d: -f3`
   GID=`echo $line | cut -d: -f4`
   PASS=`grep $UID1: /etc/shadow | cut -d: -f2`
   SHELL=`echo $line | cut -d: -f7`
   HOME=`echo $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@dlp ~]#
sh ldapuser.sh

[root@dlp ~]#
ldapadd -x -W -D "cn=Manager,dc=srv,dc=world" -f ldapuser.ldif

Enter LDAP Password:
# LDAP admin password

adding new entry "uid=cent,ou=People,dc=srv,dc=world"

adding new entry "uid=redhat,ou=People,dc=srv,dc=world"

adding new entry "uid=ubuntu,ou=People,dc=srv,dc=world"

adding new entry "uid=fedora,ou=People,dc=srv,dc=world"
[4] Add existing local groups to LDAP directory.
[root@dlp ~]#
vi ldapgroup.sh
# extract local groups who have 500-999 digit UID
# replace "SUFFIX=***" to your own suffix

#!/bin/bash

SUFFIX='dc=srv,dc=world'
LDIF='ldapgroup.ldif'

echo -n > $LDIF
for line in `grep "x:[5-9][0-9][0-9]:" /etc/group`
do
   CN=`echo $line | cut -d: -f1`
   GID=`echo $line | cut -d: -f3`
   echo "dn: cn=$CN,ou=Group,$SUFFIX" >> $LDIF
   echo "objectClass: posixGroup" >> $LDIF
   echo "cn: $CN" >> $LDIF
   echo "gidNumber: $GID" >> $LDIF
   users=`echo $line | cut -d: -f4 | sed "s/,/ /g"`
   for user in ${users} ; do
      echo "memberUid: ${user}" >> $LDIF
   done
   echo >> $LDIF
done
[root@dlp ~]#
sh ldapgroup.sh

[root@dlp ~]#
ldapadd -x -W -D "cn=Manager,dc=srv,dc=world" -f ldapgroup.ldif

Enter LDAP Password:
# LDAP admin password

adding new entry "cn=cent,ou=Group,dc=srv,dc=world"

adding new entry "cn=redhat,ou=Group,dc=srv,dc=world"

adding new entry "cn=ubuntu,ou=Group,dc=srv,dc=world"

adding new entry "cn=fedora,ou=Group,dc=srv,dc=world"
[5] If you'd like to delete User or Group in LDAP, Do as below.
[root@dlp ~]#
ldapdelete -x -W -D 'cn=Manager,dc=srv,dc=world' "uid=cent,ou=People,dc=srv,dc=world"

Enter LDAP Password:
[root@dlp ~]#
ldapdelete -x -W -D 'cn=Manager,dc=srv,dc=world' "cn=cent,ou=Group,dc=srv,dc=world"

Enter LDAP Password:
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