> > I have the following scenario -
> > 
> >      Client Cert -- Tunnel Server - Tunnel Client -- Backend server.
> > 
> > The requirement is to pass the Client Cert to the Backend server.

> If you could do that then anyone who had access to a certificate
> (for example the recipent of signed email) could impersonate the sender or

You may want to look at how Globus deals with a similar problem
for grids;  see:
http://www-fp.globus.org/security/
and
http://www.ietf.org/internet-drafts/draft-ietf-pkix-proxy-03.txt
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