On 2010-11-23 at 15:43 -0500, Phil Pennock wrote:
> Okay, your question as phrased was entirely about using client
> certificates.
> 
> Yes, you can have Exim act as the server-side, verifying client certs
> based on a CA.  The documentation is not entirely clear on this, I've
> made a note to clarify things.

http://git.exim.org/exim.git/commit/6b8e6cb23ce5cc39a83c7fd0a373c79953351fec

Added to the spec definition of tls_verify_certificates in the main
section:

+These certificates should be for the certificate authorities trusted, rather
+than the public cert of individual clients.  With both OpenSSL and GnuTLS, if
+the value is a file then the certificates are sent by Exim as a server to
+connecting clients, defining the list of accepted certificate authorities.
+Thus the values defined should be considered public data.  To avoid this,
+use OpenSSL with a directory.

-Phil

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