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ssh: Weird error message

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https://www.novabbs.com/devel/article-flat.php?id=5744&group=comp.unix.shell#5744

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From: gaze...@shell.xmission.com (Kenny McCormack)
Newsgroups: comp.unix.shell
Subject: ssh: Weird error message
Date: Tue, 18 Oct 2022 17:31:31 -0000 (UTC)
Organization: The official candy of the new Millennium
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Originator: gazelle@shell.xmission.com (Kenny McCormack)

by: Kenny McCormack - Tue, 18 Oct 2022 17:31 UTC

First note: Everything works fine, but the below message is displayed.
Alternative title for this thread: Spurious error messages for $200, Alex.

$ # I have an agent setup to do passwordless connection and have SSH_AUTH_SOCK set appropriately...
$ ssh someHost
agent key RSA SHA256:jp......................................... returned incorrect signature type

After which it connects to the remote host and everything is fine.

What (if anything) does this message mean?

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Re: ssh: Weird error message

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From: nad...@mips.inka.de (Christian Weisgerber)
Newsgroups: comp.unix.shell
Subject: Re: ssh: Weird error message
Date: Tue, 18 Oct 2022 22:27:09 -0000 (UTC)
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by: Christian Weisgerber - Tue, 18 Oct 2022 22:27 UTC

On 2022-10-18, Kenny McCormack <gazelle@shell.xmission.com> wrote:

> $ # I have an agent setup to do passwordless connection and have SSH_AUTH_SOCK set appropriately...
> $ ssh someHost
> agent key RSA SHA256:jp......................................... returned incorrect signature type
>
> After which it connects to the remote host and everything is fine.

I would use "ssh -vvv" to see exactly which signature algorithms
are offered and used.

> What (if anything) does this message mean?

My best guess--shakily supported by my reading but only partial
understanding of the relevant OpenSSH code--is that server and
client want to use an rsa-sha2-512 or rsa-sha2-256 signature, but
the agent can't handle those algorithms, and all parties fall back
to using ssh-rsa.

That in turn would imply that the agent is out of sync with the
client: A forwarding chain starting from a host with a truly ancient
ssh-agent? A poor replacement for ssh-agent, maybe gpg-agent? Some
PKCS#11 token?

--
Christian "naddy" Weisgerber naddy@mips.inka.de

The earth is like a tiny grain of sand, only much, much heavier.

devel / comp.unix.shell / ssh: Weird error message

Subject	Author
ssh: Weird error message	Kenny McCormack
Re: ssh: Weird error message	Christian Weisgerber