[Help-gnutls] Re: Authentication during Handshake

Rainer Gerhards rgerhards at gmail.com
Fri May 30 14:32:42 CEST 2008

I am hearing the hint ;) I already pulled the git archive, let me see
if I can do anything. Looks like this becomes more important than I
originally thought...


On Fri, May 30, 2008 at 11:34 AM, Simon Josefsson <simon at josefsson.org> wrote:
> No, that is not implemented.  By reading the documentation for this, I
> think GnuTLS should provide a similar callback.  Patches welcome. :)
> /Simon
> "Rainer Gerhards" <rgerhards at gmail.com> writes:
>> Just double-checking:
>> As far as I have seen openSSL's SSL_CTX_set_cert_verify_callback() is
>> not implemented inside the compatibility layer? I am asking because of
>> http://www.ietf.org/mail-archive/web/syslog/current/msg01963.html
>> Thanks,
>> Rainer
>> On Wed, May 21, 2008 at 1:53 PM, Nikos Mavrogiannopoulos
>> <nmav at gnutls.org> wrote:
>>> Rainer Gerhards wrote:
>>>> Hi Nikos,
>>>> On Wed, May 21, 2008 at 1:08 PM, Nikos Mavrogiannopoulos
>>>> <n.mavrogiannopoulos at gmail.com> wrote:
>>>>> Simon Josefsson wrote:
>>>>>>> I still would see a lot of benefit in being able to check the remote
>>>>>>> peers identity BEFORE the Finished message is sent. That way, I could
>>>>>>> block access to not permitted peers at the risk of the DoS outlined
>>>>>>> above. Am I still overlooking something?
>>>>>> No, I think that is correct.  Nikos, any thoughts?  You added some
>>>>>> callbacks during the handshake earlier, are any of those useful here?
>>>>> No unfortunately not. The callbacks I added are called after client
>>>>> hello is received. The callbacks you discuss need to be called after the
>>>>> certificate message is received.
>>>> Could you point me to the file where processing the certificate
>>>> message is done? I would be interested to see if I could add a
>>>> callback, and may it even just be to know how it is done ;)
>>> The file is gnutls_handshake.c. The functions you're interested in are
>>> _gnutls_handshake_client, _gnutls_handshake_server (if you're doing it
>>> for both of them).
>>> A similar callback is _gnutls_user_hello_func which is the post_hello
>>> callback.
>>> I'd glad to review and commit and patches for this issue.
>>> regards,
>>> Nikos

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