Guenther, Christian wrote:
Hi List, I have an application server in an internal DMZ for which I use an Apache2 as a reverse proxy. The overall communication works flawlessly. Clients connect to the Apache and it passes the communication requests through to my internal application server - by the way it is an SAP XI. Now I added SSL to my setup and this too works perfectly. A client uses SSL to contact the application server. The Apache as reverse proxy terminates the SSL connection and then connects to the internal application server via SSL.But now I want the external client to authenticate itself to the application server via client certificate and this won't work at all. I mean as I see it in normal SSL communication the client certificate is taken by the apache wich will not use it because he is not configured to check for client certificates. The application server again is supposed to authenticate the client via its certificate which fails because the Apache does not pass the certificate through to him. Is there any way of configuring the apache to terminate the SSL connection but pass the client certificate from the outside client to the internal application server???Thanks in advance, Christian Ps.: I have added my httpd.conf part that deals with the XI backend <VirtualHost 172.30.210.210> ServerName web004.externerhost.de ServerAdmin webmaster@xxxxxxxxxxxxxxx # This virtual host does not serve any documents itself but only proxy ProxyRequests Off ProxyPreserveHost On RequestHeader set ClientProtocol HTTPS # Set additional header for letting IE 6 SP2 accept 3rd party cookies # in an iframe. See: http://msdn.microsoft.com/library/default.asp?url= # /workshop/security/privacy/privacy_ovw_entry.asp for details Header add P3P CP="NOI" SSLEngine On SSLCertificateFile /etc/apache2/ssl.crt/web004_cert.pem SSLCertificateKeyFile /etc/apache2/ssl.key/web004_key.pem SSLProxyEngine On # Forward all requests for this host to SAP XI ProxyPass / https://ux210210.internerhost.lan:8007/ # Rewrite HTTP 302 object moved redirects from SAP XI ProxyPassReverse / https://ux210210.internerhost.lan:8007/ </VirtualHost>
if you don't have the frontend apache configured to check for client certificates i don't see how you can pass the certificates to the application server.
it sounds as if you will need a "double" verification - one from the frontend and one from the backend.
we have a setup where we pass the certificate (escaped) to the proxied server as a RequestHeader (we use mod_rewrite). the verification then happens at the frontend and the communication (in our case) between frontend and backend is http, not https.
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