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From "Serge Dubrouski" <serge...@gmail.com>
Subject Re: [users@httpd] Proxy SSL and Client Certificates
Date Wed, 27 Sep 2006 05:52:19 GMT
Actually the certs are public information. They contain client's
public key that is used for encrypting data that can be decrypted with
private key only, which is never get sent to the server.
But you are right that passing that certificate down to the back end
HTTPs server impossible because proxy server don't have client's
private key to decrypt backend server answers. It works with mod_jk
only because it uses AJP protocol and just sets certs data to env
without encrypting data and establishing real HTTPs connection.

Thanks for you answers. They helped me to understand why that can't be done.

On 9/26/06, Andrew E. White <aewhite@uark.edu> wrote:
> The certs have to be pulled from somewhere, and by default, at the start of a SSL connection.
Part of the SSL connection setup is the challenge phase in which the presenter must have the
private key. Remember that a cert is a public piece of information. That is why it can be
seen by others in the first place.
>
> If your backend server needs access to the client's cert, then the front end server must
be a transparent proxy in which the front end web server never acts on the data in any way.
Any other uses would be a man-in-the-middle attack because anyone could trick the browser
into transmitting the cert to them.
>
> In short, I don't know if mod_proxy can act as a full transparent proxy. It is fairly
easy to write a module to be one. Squid might also be something to look into...
>
> Andrew
>
> ----- Original Message -----
> From: Serge Dubrouski <sergeyfd@gmail.com>
> Date: Tuesday, September 26, 2006 9:04 pm
> Subject: Re: [users@httpd] Proxy SSL and Client Certificates
> To: users@httpd.apache.org
>
> > You aren't quite right. Your statement is right for crypting part but
> > not for authenticating part. IE client's key is needed fo decrypting
> > information but client crtificate is also needed for authenticating
> > client.
> >
> > For example mod_jk that is used for connecting Apache to Tomcat has
> > following options for passing SSL data from Apache to Tomcat:
> >
> > JkExtractSSL On
> > # What is the indicator for SSL (default is HTTPS)
> > JkHTTPSIndicator HTTPS
> > # What is the indicator for SSL session (default is SSL_SESSION_ID)
> > JkSESSIONIndicator SSL_SESSION_ID
> > # What is the indicator for client SSL cipher suit (default is
> > SSL_CIPHER)JkCIPHERIndicator SSL_CIPHER
> > # What is the indicator for the client SSL certificated (default is
> > SSL_CLIENT_CERT)
> > JkCERTSIndicator SSL_CLIENT_CERT
> >
> > And Tomcat sees client certificates all right after that. I'm looking
> > for that kind of options for mod_proxy.
> >
> >
> > On 9/26/06, Andrew E. White <aewhite@uark.edu> wrote:
> > > By nature, certs require a private key to verify them, so if a
> > user is passing through your web server, the client's certificate
> > will do you no good beyond the webserver since the webserver does
> > not have the client's private key.
> > >
> > > Andrew
> > >
> > > ----- Original Message -----
> > > From: Serge Dubrouski <sergeyfd@gmail.com>
> > > Date: Tuesday, September 26, 2006 5:12 pm
> > > Subject: [users@httpd] Proxy SSL and Client Certificates
> > > To: users@httpd.apache.org
> > >
> > > > Hello Everyone -
> > > >
> > > > I have an Apache 2.2.3 server installed with mod_proxy and mod_ssl
> > > > configured that I use as a frontend server in Internet. I also
> > have> > iPlanet backend  legasy server that runs on of our custom
> > > > applications. That application has embedded authentication
> > based on
> > > > clients SSL Certificates. Now I want to make Apache to act as a
> > proxy> > server between Internet users and that backend iPlanet
> > server. The
> > > > problem here is that I can't make Apache to pass submitted client
> > > > certificate down to iPlanet. Does anybody have any idea how to do
> > > > that? Simple SSLProxyEngine does not work.
> > > >
> > > > Thanks.
> > > >
> > > > Serge.
> > > >
> > > > ----------------------------------------------------------------
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