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13Aug/111

Multiple domain selfsigned ssl/tls certificates for Apache (namebased ssl/tls vhosts)

This is an old problem: how to have ssl/tls name based virtual hosts with Apache .
The issue is that the ssl/tls connection is established before Apache even receives a HTTP request.When Apache receives the request already the SSL connection is established with a particular hostname - ip & ssl certificate combination so this means that it is capable of serving NameBased virtual hosts only for that particular ssl/tls certificate.

There are two possible solutions here:

  • Multi domain or wildcard SSL/TLS certificates. Those are certificates which are configured with more than one name so you can create virtual hosts (in case of apache) for those domains. This is fairly easy to set up and at least for me it has worked ok in the past.
  • Server Name Indication (SNI) which is an extension to the SSL/TLS protocol and allows the client to specify the desired domain earlier and the server to be notified so it supplies the correct SSL/TLS certificate depending on the requested hostname. The problem is SNI is fairly new and few server side software supports it, also client side software needs to be fairly new. On the long run this is going to be the best solution as it has been designed to overcome this specific problem
Filed under: Apache, Linux, ssl, Web Continue reading