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Re: [jetty-users] Trusting all client certificates still causes certificates not in trust store to fail (9.0.0.M3)

Does this commit (post RC0) help you?

Joakim Erdfelt <joakim@xxxxxxxxxxx>
Developer advice, services and support
from the Jetty & CometD experts

On Tue, Feb 19, 2013 at 3:08 PM, Ago Allikmaa <maxorator@xxxxxxxxx> wrote:
A little update. Enabling the OCSP with SslContextFactory didn't seem to break anything. Any way to verify that it is actually doing a successful OCSP check?

I couldn't get client certificates to work with M5, RC0, but it worked in M3. The commit that breaks my code is at:

Why would hostname verification cause my client certificate verification to fail? And what is the point of it anyway - I'm writing a server, the client
certificate isn't supposed to contain a hostname that resolves to his IP address.

Currently I simply wrote a wrapper that "rolls back" this commit. Any suggestions about whether it is a bug or after that commit I just have to use it differently?

Also I googled a bit about not dropping the connection when the client certificate is invalid - found that using a custom TrustManager should do the trick,
but I have no idea how I could make Jetty use it. Any ideas?


On 19.02.2013 17:58, Ago Allikmaa wrote:
Thanks for the info.

Basically I have the CA certificates. I was under the impression that if I do OCSP, it also checks if the certificate is signed, but if that's not the case,
I guess I could let the SSL layer handle that at least. The perfect way for me would be that the client certificate is checked against the CA certificates,
but even if it's detected to be invalid, my servlet will run, but I could simply find out whether the check was a success or not. I find these automatic
errors that actually just confuse the end-user really annoying, I'd like to respond to failure in a way I choose, especially because the errors that
Jetty servers throw are quite ambiguous, resulting in Opera and Firefox to say "Unable to connect" and "Connection was interrupted" respectively,
only Chrome manages to deduce it has something to do with SSL at all. Most sites I've encountered throw an error that the browser interprets as
an "SSL handshake failure".

Now, I added the CA certificates to the trust store. With M3, it works nicely, but with RC0 I get the usual errors after selecting the certificate
and entering the PIN (it's a certificate from a smart card). Is this a possible regression?

Even with M3 and CA certificates, I'm not sure how to do OCSP properly. SslContextFactory has methods setEnableOCSP and setOcspResponderURL,
but the reference implementation provided by the OCSP/smart card operator also uses a OCSP responder certificate (there's a corresponding one for
each of the CA certificates) that is passed to openssl via the "-VAfile" file argument. How would I use these in Jetty?


On 19.02.2013 17:17, Marvin Addison wrote:
how does the
browser even know which ones server "trusts", does it send all of its
certificates to the server and asks if they're trusted?)
The server sends all CA names listed in the _server_ truststore in the
"CertificateRequest" message sent to the client. The user agent
(browser) will only allow you to choose from certificates it knows
about that are issued by the list of CAs mentioned by the server. The
diagram in the "SSL Protocol" section of the JSSE documentation may be
a helpful reference:

Also, while I'm already asking, are there any examples out there for
accessing certificate information (will specify later) using
HttpServletRequest and HttpServletResponse objects passed to a servlet?
Assuming Jetty implements the relevant part of the servlet specification:

If there is an SSL certificate associated with the request, it must be
exposed by
the servlet container to the servlet programmer as an array of objects of type and accessible via a ServletRequest
attribute of javax.servlet.request.X509Certificate.

like to do the actual verification in a servlet, so I could invent my own
output in both failed and succeeded certificate check. The actual
verification is basically an OCSP query
I would recommend caution here. OCSP deals exclusively with
revocation. While the certificate may not be revoked, it may not meet
PKIX validation requirements. User agent behavior with regard to CA
matching in the CertificateRequest part of the SSL handshake is made
in some cases by string comparison. Without a proper PKIX check, you
could be trusting by naming alone, which would totally subvert the
signature-based checks at the heart of PKI.

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