[SUPPORT REQUEST] Configuration of libssh host key algos on client

[Sebastian Kraust <sebastian.kraust@xxxxxxxxxx>]

Hello libssh-team,

I am currently working on a project using libssh under the hood, but have problems to get it to work. I hope you can provide some help.

Task
Write a client for an existing server which cannot be changed/configured by me.

Approach
Connect to the server using the function `ssh_connect`.

Error
kex error : no match for method server host key algo: server [ssh-rsa], client [ssh-ed25519,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,rsa-sha2-512,rsa-sha2-256]

Problem
Due to the restriction that I can only change the client side, I have to change the client so that it accepts the ssh-rsa algo.
According to the docs, it should be capable of doing so.

Troubleshooting so far
Added
PubkeyAcceptedKeyTypes ssh-ed25519*,ssh-rsa*,ssh-dss*,ecdsa-sha2
to /etc/ssh/sshd_config to allow every algo on the client side.

I still get the same error. I do believe that the config might not be the correct file to configure libssh.

Can you give me some direction where I have to configure libssh so that the client also accepts the ssh-rsa algorithm? If you need more information, please let me know.


Thanks for your help in advance.


Mit freundlichen Grüßen / Best regards

i.A. Sebastian Kraust
Forschungsingenieur / Research Engineer

b-plus GmbH
Osterhofener Str. 13 | 93055 Regensburg
Tel +49 941 46624 208 | Fax +49 991 270302 99
sebastian.kraust@xxxxxxxxxx

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