OpenLDAP : Configure LDAP Server2022/11/23

	Configure LDAP Server in order to share users' accounts in your local networks.
[1]	Install OpenLDAP.

[root@dlp ~]#

dnf -y install openldap-servers openldap-clients

[root@dlp ~]#

systemctl enable --now slapd

[2]	Set OpenLDAP admin password.

# generate encrypted password

[root@dlp ~]#

slappasswd

New password:
Re-enter new password:
{SSHA}xxxxxxxxxxxxxxxxxxxxxxxx

[root@dlp ~]#

vi chrootpw.ldif

# specify the password generated above for [olcRootPW] section

dn: olcDatabase={0}config,cn=config
changetype: modify
add: olcRootPW
olcRootPW: {SSHA}xxxxxxxxxxxxxxxxxxxxxxxx

[root@dlp ~]#

ldapadd -Y EXTERNAL -H ldapi:/// -f chrootpw.ldif

SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
modifying entry "olcDatabase={0}config,cn=config"

[3]	Import basic Schemas.

[root@dlp ~]#

ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/cosine.ldif

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

[root@dlp ~]#

ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/nis.ldif

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

[root@dlp ~]#

ldapadd -Y EXTERNAL -H ldapi:/// -f /etc/openldap/schema/inetorgperson.ldif

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

[4]	Set your domain name on LDAP DB.

# generate directory manager's password

[root@dlp ~]#

slappasswd

New password:
Re-enter new password:
{SSHA}xxxxxxxxxxxxxxxxxxxxxxxx

[root@dlp ~]#

vi chdomain.ldif

# replace to your own domain name for [dc=***,dc=***] section
# specify the password generated above for [olcRootPW] section

dn: olcDatabase={1}monitor,cn=config
changetype: modify
replace: olcAccess
olcAccess: {0}to * by dn.base="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth"
  read by dn.base="cn=Manager,dc=srv,dc=world" read by * none

dn: olcDatabase={2}mdb,cn=config
changetype: modify
replace: olcSuffix
olcSuffix: dc=srv,dc=world

dn: olcDatabase={2}mdb,cn=config
changetype: modify
replace: olcRootDN
olcRootDN: cn=Manager,dc=srv,dc=world

dn: olcDatabase={2}mdb,cn=config
changetype: modify
add: olcRootPW
olcRootPW: {SSHA}xxxxxxxxxxxxxxxxxxxxxxxx

dn: olcDatabase={2}mdb,cn=config
changetype: modify
add: olcAccess
olcAccess: {0}to attrs=userPassword,shadowLastChange by
  dn="cn=Manager,dc=srv,dc=world" write by anonymous auth by self write by * none
olcAccess: {1}to dn.base="" by * read
olcAccess: {2}to * by dn="cn=Manager,dc=srv,dc=world" write by * read

[root@dlp ~]#

ldapmodify -Y EXTERNAL -H ldapi:/// -f chdomain.ldif

SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
modifying entry "olcDatabase={1}monitor,cn=config"

modifying entry "olcDatabase={2}mdb,cn=config"

modifying entry "olcDatabase={2}mdb,cn=config"

modifying entry "olcDatabase={2}mdb,cn=config"

modifying entry "olcDatabase={2}mdb,cn=config"

[root@dlp ~]#

vi basedomain.ldif

# replace to your own domain name for [dc=***,dc=***] section

dn: dc=srv,dc=world
objectClass: top
objectClass: dcObject
objectclass: organization
o: Server World
dc: srv

dn: cn=Manager,dc=srv,dc=world
objectClass: organizationalRole
cn: Manager
description: Directory Manager

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

dn: ou=Group,dc=srv,dc=world
objectClass: organizationalUnit
ou: Group

[root@dlp ~]#

ldapadd -x -D cn=Manager,dc=srv,dc=world -W -f basedomain.ldif

Enter LDAP Password:

# directory manager's password

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

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

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

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

[5]	Configure SSL/TLS Setting. On this example, it uses self-signed certificates like here.
[6]	Configure Slapd for SSL/TLS.

[root@dlp ~]#

cp /etc/pki/tls/certs/{server.key,server.crt} /etc/openldap/certs/

[root@dlp ~]#

chown ldap:ldap /etc/openldap/certs/{server.key,server.crt}

[root@dlp ~]#

vi mod_ssl.ldif

# create new

dn: cn=config
changetype: modify
replace: olcTLSCertificateFile
olcTLSCertificateFile: /etc/openldap/certs/server.crt
-
replace: olcTLSCertificateKeyFile
olcTLSCertificateKeyFile: /etc/openldap/certs/server.key

[root@dlp ~]#

ldapmodify -Y EXTERNAL -H ldapi:/// -f mod_ssl.ldif

SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
modifying entry "cn=config"

[root@dlp ~]#

systemctl restart slapd

[7]	If Firewalld is running, allow LDAP service.

[root@dlp ~]#

firewall-cmd --add-service={ldap,ldaps}

success
[root@dlp ~]#

firewall-cmd --runtime-to-permanent

success

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