Ubuntu 22.04
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OpenLDAP : LDAP over SSL/TLS2022/05/09
 
Configure LDAP over SSL/TLS to use secure encrypted connection.
[1]
On this example, create and use self-signed certificates like here.
[2] Configure LDAP Server.
root@dlp:~#
cp /etc/ssl/private/server.key \
/etc/ssl/private/server.crt \
/etc/ssl/certs/ca-certificates.crt \
/etc/ldap/sasl2/

root@dlp:~#
chown openldap. /etc/ldap/sasl2/server.key \
/etc/ldap/sasl2/server.crt \
/etc/ldap/sasl2/ca-certificates.crt
root@dlp:~#
vi mod_ssl.ldif
# create new

dn: cn=config
changetype: modify
add: olcTLSCACertificateFile
olcTLSCACertificateFile: /etc/ldap/sasl2/ca-certificates.crt
-
replace: olcTLSCertificateFile
olcTLSCertificateFile: /etc/ldap/sasl2/server.crt
-
replace: olcTLSCertificateKeyFile
olcTLSCertificateKeyFile: /etc/ldap/sasl2/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
[3] Configure LDAP Client.
If you'd like to make sure the connection between LDAP server and client is encrypted, use tcpdump or other network capture softwares on LDAP server.
root@node01:~#
vi /etc/nslcd.conf
# line 29 : add

ssl start_tls
tls_reqcert allow
root@node01:~#
systemctl restart nslcd

root@node01:~#
exit 
node01 login: jammy     # LDAP user
Password:
Welcome to Ubuntu 22.04 LTS (GNU/Linux 5.15.0-25-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

.....
.....

jammy@node01:~$      # logined
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