Hi,
I do think letting users configure the permissible curves (and their
priority) using a public tx API, and exposing all of the curves that the
underlying openssl provides is important.
FWIW, the german BSI (a state IT security institute that provides
recommendations, and certifications) now recommends:
brainpoolP256r1, brainpoolP384r1, brainpoolP512r1
and only if none of these is avail, falls back to
secp256r1, secp384r1
Page 15 (3.6.1) here:
https://www.bsi.bund.de/SharedDocs/Downloads/DE/BSI/Publikationen/TechnischeRichtlinien/TR02102/BSI-TR-02102-2.pdf?__blob=publicationFile
--
Currently, eg Crossbar.io is using secp256r1 (not configurable)
https://github.com/crossbario/crossbar/blob/master/crossbar/twisted/tlsctx.py#L331
https://github.com/crossbario/crossbar/blob/master/crossbar/twisted/tlsctx.py#L206
and we would like to move to a configurable, maintainable solution.
Cheers,
/Tobias
Am 17.04.2017 um 18:46 schrieb Thedore Oidelson:
I'm taking Glyph's suggestion and bringing this to the mailing list. :)
I still believe it was unwise to remove the support for the extra EC curves
in PR #749 for a few reasons that I've said in a few different places so
I'll summarize them here.
* Support for more curves is better. It gives more options to users and
developers such as myself who want to use Twisted for custom environments.
All of this widens the support base.
* These are all curves suggested in RFC 5656, and I believe the more
Twisted supports the RFC the better.
* There are cases for using alternative curves. NIST-T-571 is stronger
than any of the currently supported curves. NIST-K-163 is weaker, but
there are still uses for it. I may be working in an embedded environment
where every CPU cycle counts and I just need simple encryption to protect
against simple plain text scanning.
* Having extra curves does not make Twisted less secure. SSH negotiates
encryption based on a list of preferred ciphers. We put the strongest
ciphers first and the weaker curves only get used if nothing better is
available where weak encryption is still better than no encryption.
There are other reasons why I think it makes sense to have the curves in
Twisted but these are the main ones.
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