Today I upgraded OpenLDAP in order to fix the insufficient input validation security problem (DSA-1943-1).
Unfortunately OpenLDAP refused to start after the upgrade.
After adding
loglevel config stats
to the configuration file it gave me at least the meaningful error message:
First of all create a self-signed certificate by following the instructions at http://www.eclectica.ca/howto/ssl-cert-howto.php. I copied the private key and the certificates to /etc/ldap. Please make sure that the
private key is only readable by root.
Next add the following lines to /etc/ldap/slapd.conf:
TLSCaCertificateFile /etc/ldap/cacert.pem
TLSCertificateFile /etc/ldap/cert.pem
TLSCertificateKeyFile /etc/ldap/cert.key
Finally make sure that the LDAP server is listening at the ldaps port (636) by editing /etc/default/slapd
and restarting the LDAP server.