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devel / comp.security.ssh / Re: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)

SubjectAuthor
* Couldn't agree a client-to-server MAC (available: hmac-sha2-512)Magicman8508
`* Re: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)Simon Tatham
 `* Re: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)Magicman8508
  `- Re: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)Austin Harsh

1
Couldn't agree a client-to-server MAC (available: hmac-sha2-512)
  comp.security.ssh
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Newsgroups: comp.security.ssh
Date: Fri, 21 Apr 2023 00:51:23 -0700 (PDT)
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Subject: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)
From: magicman...@gmail.com (Magicman8508)
Injection-Date: Fri, 21 Apr 2023 07:51:23 +0000
Content-Type: text/plain; charset="UTF-8"
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Xref: rslight2 comp.security.ssh:295
 by: Magicman8508 - Fri, 21 Apr 2023 07:51 UTC

I get this error when i try to connect to some devices. Any way i can fix this? I have tried the latest release and also the current nightly build.

Thanks

Re: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)
  comp.security.ssh
Path: i2pn2.org!i2pn.org!usenet.goja.nl.eu.org!2.eu.feeder.erje.net!feeder.erje.net!feeds.news.ox.ac.uk!news.ox.ac.uk!nntp-feed.chiark.greenend.org.uk!ewrotcd!.POSTED.chiark.greenend.org.uk!not-for-mail
From: ana...@pobox.com (Simon Tatham)
Newsgroups: comp.security.ssh
Subject: Re: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)
Date: Sat, 22 Apr 2023 07:06:53 +0100
Message-ID: <81354slabm.fsf@thyestes.tartarus.org>
References: <af3bea9d-a050-4810-b5c2-d88cb698dca2n@googlegroups.com>
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Originator: simon@tunnel.thyestes.tartarus.org ([172.31.80.4])
Xref: rslight2 comp.security.ssh:296
 by: Simon Tatham - Sat, 22 Apr 2023 06:06 UTC

Magicman8508 <magicman8508@gmail.com> writes:

> I get this error when i try to connect to some devices. Any way i can
> fix this? I have tried the latest release and also the current nightly
> build.

This is the first I've heard of any server _only_ speaking HMAC-SHA-512.
It's not really a recommended configuration, because HMAC-SHA-512 is
specified as OPTIONAL, which does mean there's a risk of clients not
supporting it. What is this server, anyway?

I've added HMAC-SHA-512 to PuTTY. Try today's nightly build.

--
import hashlib; print((lambda p,q,g,y,r,s,m: (lambda w:(pow(g,int(hashlib.sha1(
m.encode('ascii')).hexdigest(),16)*w%q,p)*pow(y,r*w%q,p)%p)%q)(pow(s,q-2,q))==r
and s%q!=0 and m)(12342649995480866419, 2278082317364501, 1670428356600652640,
5398151833726432125, 645223105888478, 1916678356240619, "<anakin@pobox.com>"))

Re: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)
  comp.security.ssh
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Newsgroups: comp.security.ssh
Date: Mon, 24 Apr 2023 02:44:52 -0700 (PDT)
In-Reply-To: <81354slabm.fsf@thyestes.tartarus.org>
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Subject: Re: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)
From: magicman...@gmail.com (Magicman8508)
Injection-Date: Mon, 24 Apr 2023 09:44:53 +0000
Content-Type: text/plain; charset="UTF-8"
Xref: rslight2 comp.security.ssh:298
 by: Magicman8508 - Mon, 24 Apr 2023 09:44 UTC

I just tried the recent nightly version and it works! Perfect. Many thanks. Didn't thought it could be resolved so fast.

In my case it affects a cisco 9800 series. Not sure why it is configured this way. Maybe a company policy only allows hmac-sha2-512.

Thanks again.
Have a great day.

Re: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)
  comp.security.ssh
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Newsgroups: comp.security.ssh
Date: Fri, 2 Jun 2023 17:57:10 -0700 (PDT)
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<81354slabm.fsf@thyestes.tartarus.org> <aeb354e6-f542-418d-9c06-ee94c9a0fd1dn@googlegroups.com>
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Subject: Re: Couldn't agree a client-to-server MAC (available: hmac-sha2-512)
From: harsh.au...@gmail.com (Austin Harsh)
Injection-Date: Sat, 03 Jun 2023 00:57:10 +0000
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Content-Transfer-Encoding: quoted-printable
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Xref: rslight2 comp.security.ssh:302
 by: Austin Harsh - Sat, 3 Jun 2023 00:57 UTC

On Monday, April 24, 2023 at 9:44:54 PM UTC+12, Magicman8508 wrote:
> I just tried the recent nightly version and it works! Perfect. Many thanks. Didn't thought it could be resolved so fast.
>
> In my case it affects a cisco 9800 series. Not sure why it is configured this way. Maybe a company policy only allows hmac-sha2-512.
>
> Thanks again.
> Have a great day.

In my case this is based on the new US Government CNSA V2.0 policy (this is what is replacing FIPS stuff, kind of). CNSA V2.0 states you must use HMAC-SHA2-384 or HMAC-SHA2-512. Cisco switches do not support the 384 variant, so you have to use 512. In the future (~5 years) PuTTY will eventually need to support a new hashing algorithm called CRYSTALS-Kyber. https://media.defense.gov/2022/Sep/07/2003071834/-1/-1/0/CSA_CNSA_2.0_ALGORITHMS_.PDF

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server_pubkey.txt

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