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Bug#777549: openssh-client: Setting KexAlgorithms disables GSSAPIKeyExchange



On Mon, 2015-02-09 at 19:18 -0800, Russ Allbery wrote: 
> It does make sense to me that it should be possible to both enable GSS-API
> key exchange and otherwise restrict the key exchange methods that the
> server will use in the absence of GSS-API.  (Ideally, you could restrict
> which specific GSS-API key exchange algorithms would be used, but I think
> there aren't many to choose from anyway.)
Well at least it should be absolutely obvious and controllable for an
admin, which methods are used and which are forbidden.
I think automatic/hidden fallbacks are generally a security problem
(unless of course one they are simply part of default options, which one
can override.


> This whole thing is unnecessarily irritating due to the OpenSSH project's
> unwillingness to take the key exchange patches, forcing every distribution
> to apply them separately and meaning that they aren't considered when
> upstream works on things like the configuration parameter for key exchange
> methods.
Well... unfortunately upstream blocks (or at least shows no interest in)
many things that might be nice or security relevant :(


Cheers,
Chris.

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