Quanah,
I ran netstat -a | egrep ":ldap" and found that the replication between my two test servers was not ldaps thus me reaching out to this forum.
If “ldap://” is secure already then I do not need to proceed further. These are the SLAPD_URLS in the /etc/sysconfig/slapd file:
SLAPD_URLS="ldapi:/// ldap:/// ldaps:///"
I have TLS enabled everywhere and have encrypted connections between clients and servers.
These are the ciphers running on both masters:
SSLv3
TLSv1.2
I am using simple binds so I’ll look at SASL/EXTERNAL with authz-regexp mapping.
Why is version 2.4.40 unsafe for multi-master replication? I can upgrade at a later time I just wanted to find out how to enable ldaps between the two servers.
From:
Quanah Gibson-Mount <quanah@symas.com>
Reply-To: Quanah Gibson-Mount <quanah@symas.com>
Date: Saturday, May 6, 2017 at 1:02 PM
To: "Real, Elizabeth (392K)" <Elizabeth.Real@jpl.nasa.gov>, "openldap-technical@openldap.org" <openldap-technical@openldap.org>
Subject: Re: Secure replication
--On Saturday, May 06, 2017 1:56 AM +0000 "Real, Elizabeth (392K)"
The olcSyncRepl directive on both systems needs to go from:
olcSyncRepl: rid=001 provider=ldap
olcSyncRepl: rid=001 provider=ldaps
The use of "ldap://" does not mean that you have insecure replication. The
"ldaps" designation was developed to allow for SSL encrypted connections as
a part of LDAPv2, which did not have a formal design spec for allowing SSL
encryption. The LDAPv3 spec, which is what OpenLDAP 2.4 (and much earlier
version) implement, specifically has startTLS as a part of that
specification, which uses "ldap:///". I.e., ldaps is a bastardized hack
for LDAPv2. The proper way to do TLS encryption with LDAPv3 capable
servers such as OpenLDAP 2.[1-4+] is to use the startTLS extended operation
In addition, there are other ways to have an encrypted connection between
an LDAP client and server without involving TLS at all, such as SASL/GSSAPI.
As Michael noted, you can, in addition to enabling TLS encryption between
the client and servers, use client cert authentication (SASL/EXTERNAL) so
as to remove the requirement for clear text credentials to be stored in the
olcSyncRepl attribute (if using simple binds). And again, the usage of
SASL/GSSAPI also precludes the neccessity of storing cleartext credentials
in the olcSyncRepl attribute.
As an aside, I would note that 2.4.40 is completely unsafe to use with
I would generally suggest forming a clear set of requirements for your
replication environment, and then asking how to implement them. Your
current question is too vague/general to really be answered well.
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