Logs for jabber@conference.jabber.org

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[10:47:29] <mittwinter> hey, is it known, that one cannot connect s2s with jabber.org if the connecting server uses a certificate/key pair with > 4096 bits, e.g. 8192 or even 15424 bits (as it is for example generated by certtool --sec-param ultra)? I configured my prosody instance to use such a certificate and I then get "ssl handshake failed" for every connection to jabber.org while other connections work just fine, if I switch to a 4096 bit key pair, connections to
[10:47:29] <mittwinter> jabber.org also succeed
[10:58:37] <intosi> mittwinter: I did not know that. Will try to reproduce. Thanks for letting us know.
[10:58:54] <mittwinter> of course
[10:59:11] <mittwinter> if I can do anything to help, I will
[10:59:20] <intosi> Thanks.
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[11:02:57] <intosi> It might be due to this issue in openssl, that's still marked as open: http://rt.openssl.org/Ticket/Display.html?user=guest&pass=guest&id=319
[11:03:42] <intosi> Or at least related to it.
[11:07:51] <mittwinter> maybe, but in general, openssl seems to work with such key lengths, as for example I am using ligttpd 1.4.34 which in turn uses my local openss-1.0.1f for SSL/TLS, and there are no problems in using keys with more than 4096 bits
[11:08:40] <intosi> https://forums.openvpn.net/topic13776.html
[11:09:28] <intosi> So it appears to depend on the version of openssl (and upstream maintainers might have chosen to increase the maximum message size in one of their patches)
[11:14:05] <mittwinter> ah, I see... so maybe I'll poke the openssl devs to find out which version would support what lengths
[11:14:59] <mittwinter> but I guess sticking to 4096 bit would be the best choice anyway for now, to be able to talk to as many servers as possible
[11:16:00] <intosi> I think that's indeed the right conclusion.
[11:16:33] <intosi> I agree with you that this is not ideal, but they way things look like at the moment, 4096 bits should be sufficiently strong for a while.
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[11:19:08] <intosi> http://www.keylength.com/en/compare/
[11:20:49] <mittwinter> thanks, also for immediately looking into this issue :)
[11:21:32] <mittwinter> until now, I just went with the most secure setting I could set for this parameter as there were no problems
[11:24:04] <intosi> You're welcome.
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[11:24:48] <luisgf> 15424 bits for a key, wow
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[11:25:00] <luisgf> the handshake may be very slow :)
[11:25:07] <luisgf> and whats about EC ?
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