Can we disable diffie-hellman-group-exchange-sha1 by default?

[Darren Tucker]

On Fri, 15 Feb 2019 at 14:22, Yegor Ievlev <koops1997 at gmail.com> wrote:
> I'm not nearly knowledgeable enough in crypto to fully understand your
> answer, but I will try. I wonder why moduli are not automatically
> generated the first time sshd is started though. That would make much
> more sense than shipping a default moduli file but also asking
> everyone to replace it with their own.

That was the original intent (and it's mentioned in RFC4419) however
each moduli file we ship (70-80 instances of 6 sizes)  takes about 1
cpu-month to generate on a lowish-power x86-64 machine.  Most of it is
parallelizable, but even then it'd likely take a few hours to generate
one of each size.  I imagine that'd cause some complaints about
startup time.

With those caveats, you are also welcome to add the appropriate
ssh-keygen commands to your startup scripts.

-- 
Darren Tucker (dtucker at dtucker.net)
GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860  37F4 9357 ECEF 11EA A6FA (new)
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.