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Re: Status of SSH_KNOWNHOSTS in pycurl

From: Daniel Stenberg via curl-and-python <curl-and-python_at_cool.haxx.se>
Date: Tue, 18 Feb 2020 13:26:36 +0100 (CET)

On Tue, 18 Feb 2020, Mathieu Dubois via curl-and-python wrote:

> I have read in some pycurl files (tests/ssh_key_cb_test.py) that
> SSH_KNOWNHOSTS is not supported with the libssh backend. However, no
> exception is raised. Is this the cause of the problem ?

That "not supported" part is news to me. The code certainly looks like it
tries to support it...

> I have noticed that if connect to the server with sftp and add the key in
> ~/.ssh/known_hosts, curl (not pycurl) can connect without problem. pycurl
> can too if I don't set SSH_KNOWNHOSTS (otherwise it doesn't work).
>
> Note that pycurl uses ssh-rsa keys while ssh uses ecdsa-sha2-nistp256 keys.
>
> Can somebody explain that ?

It looks like a bug to me. Exactly in which component the bug lies is harder
to say, but libssh or libcurl seem like the most plausible ones to blame... 

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Received on 2020-02-18