# yum install openvpn-auth-ldap
The plugin will install to /usr/lib64/openvpn/plugin/lib/openvpn-auth-ldap.so and you can use that in your OpenVPN configuration file.
I built the RPM from the openvpn-auth-ldap-2.0.3-14.
I’ve reached out to see about getting both this and my re2c package included in EPEL7, which will probably require me to become the maintainer. We shall see how that plays out.