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OpenLDAP : LDAP over SSL/TLS2024/04/18


Configure LDAP over SSL/TLS to use secure encrypted connection.


On this example, create and use self-signed certificates like here.

[2] Configure LDAP Server.
root@dlp:~ #
mkdir /usr/local/etc/openldap/certs.d

root@dlp:~ #
cp /usr/local/etc/ssl/server.key \
/usr/local/etc/ssl/server.crt \

root@dlp:~ #
chown -R ldap:ldap /usr/local/etc/openldap/certs.d
root@dlp:~ #
vi mod_ssl.ldif
# create new

dn: cn=config
changetype: modify
replace: olcTLSCertificateFile
olcTLSCertificateFile: /usr/local/etc/openldap/certs.d/server.crt
replace: olcTLSCertificateKeyFile
olcTLSCertificateKeyFile: /usr/local/etc/openldap/certs.d/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
modifying entry "cn=config"

root@dlp:~ #
service slapd restart

[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 /usr/local/etc/nslcd.conf
# line 64 : add

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

root@node01:~ #
node01 login: freebsd    # LDAP user
Last login: Thu Apr 18 12:49:40 from
FreeBSD 14.0-RELEASE (GENERIC) #0 releng/14.0-n265380-f9716eee8ab4: Fri Nov 10 05:57:23 UTC 2023

Welcome to FreeBSD!


freebsd@node01:~ $
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