Hello!

I run Apache 1.3.19 with mod_ssl 2.8.2 as reverse proxy. This reverse proxy does the 
SSL part of the web application. On a specific URL the reverse proxy requests a client 
certificate from the browser using this configuration:

<Location /blablabla/>
     SSLVerifyClient require
     SSLVerifyDepth 1
</Location>
SSLCACertificateFile /blabla/my.CA.crt

This works fine, but the problem is that the application runs on another web server 
behind the reverse proxy and that the application needs to know/verify the client 
certificate serial number. Therefore somebody (before I started the job here ;-) ) 
wrote a patch that imports the client certification information into the HTTP header 
of the incoming request so that mod_proxy forwards this information to the web server.

Stupid enough this patch is mod_ssl version dependend so I am looking for a nicer 
solution. I can imagine that the combination of apache and mod_ssl as a reverse proxy 
is very popular and many people have demand on forwarding certificate informations to 
the application (web server).

So, is there a nicer solution?
Is this enough reason for adding some configuration parameters into mod_ssl to forward 
those informations like

SSLForwardVariable  SSL_CLIENT_M_SERIAL

?

Darko Krizic



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