Re: [dane] DANE Testing
Viktor Dukhovni <viktor1dane@dukhovni.org> Fri, 21 February 2014 21:38 UTC
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Date: Fri, 21 Feb 2014 21:38:19 +0000
From: Viktor Dukhovni <viktor1dane@dukhovni.org>
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Subject: Re: [dane] DANE Testing
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On Fri, Feb 21, 2014 at 03:19:10PM -0500, Stephen Nightingale wrote: > It is now possible to test from both TLSlite based and GnuTLS based > clients. The GnuTLS DANE implementation does not implement DANE-TA(2) or correctly. It may also IIRC not do PKIX-TA(0) right either. The issue is that the TA is incorrectly constrained to be the immediate issuer of the leaf certificate. There may be other problems, I did not perform a comprehensive code review. So results from GnuTLS DANE verification can be misleading. > A golden, canonical CA list would be nice to find. But I guess that its > non-universal availability is one of the problems of the CA system > that DANE is aiming squarely at. There is no such beast. A form of Goedel's incompleteness theorem applies: any list of CAs is either incomplete or untrustworthy (or both). > The differences between TLSlite and GnuTLS clients highlight the > fact that there are unresolved interoperability issues among TLS > implementations. Default configurations of GnuTLS typically enforce unreasonable minimum sizes on EDH primes. Applications have to work around these with policy overrides. > I look forward to seeing the newly upgraded OpenSSL > client with added DANE. It is quite possible that as an interim step > before its appearance I will add this DANE-in-the-App implementation > to pyOpenSSL and/or Twisted. Such a project should not be undertaken lightly, it is too easy to get it wrong. > If you find any glaring errors, I will be embarrassed but thankful. > If you find any subtle errors I will be impressed and thankful. A code review is required to rule out subtle errors, glaring errors may show up in tests if the test bed is sufficiently comprehensive. -- Viktor.
- [dane] DANE Testing Stephen Nightingale
- Re: [dane] DANE Testing Viktor Dukhovni
- Re: [dane] DANE Testing Stephen Nightingale
- Re: [dane] DANE Testing Viktor Dukhovni
- Re: [dane] [Uta] DANE Testing Kurt Roeckx
- Re: [dane] [Uta] DANE Testing Viktor Dukhovni