handshake failed: [ssh: no auth passed yet]

[realyukii]

I tried the following on the ssh client:

$ ssh localhost hemlo
Unable to negotiate with 127.0.0.1 port 22: no matching host key type found. Their offer: ssh-rsa

and on the sshfront:

sudo ./sshfront -a "" -d -h 127.0.0.1 `which echo`
2025/02/25 04:16:58 host key file error: open ~/.ssh/id_rsa: no such file or directory
2025/02/25 04:16:58 no host key provided, generating host key
2025/02/25 04:16:58 sshfront v0.2.1 listening on 127.0.0.1:22 ...
2025/02/25 04:17:10 handshake failed: ssh: no common algorithm for host key; client offered: [ssh-ed25519-cert-v01@openssh.com ecdsa-sha2-nistp256-cert-v01@openssh.com ecdsa-sha2-nistp384-cert-v01@openssh.com ecdsa-sha2-nistp521-cert-v01@openssh.com sk-ssh-ed25519-cert-v01@openssh.com sk-ecdsa-sha2-nistp256-cert-v01@openssh.com rsa-sha2-512-cert-v01@openssh.com rsa-sha2-256-cert-v01@openssh.com ssh-ed25519 ecdsa-sha2-nistp256 ecdsa-sha2-nistp384 ecdsa-sha2-nistp521 sk-ssh-ed25519@openssh.com sk-ecdsa-sha2-nistp256@openssh.com rsa-sha2-512 rsa-sha2-256], server offered: [ssh-rsa]

whether the ssh username is set or not, it still shows the same error

[realyukii]

now the error message changed:

$ ssh -o PubkeyAcceptedAlgorithms=+ssh-rsa -o HostkeyAlgorithms=+ssh-rsa localhost hemlo
ssh_dispatch_run_fatal: Connection to 127.0.0.1 port 22: Invalid key length
$ ssh -V
OpenSSH_9.9p2, OpenSSL 3.4.1 11 Feb 2025

found the option on stackoverflow

[realyukii]

Oh, I'm sorry, I didn't notice the sshfront I use is from 2016 (v0.2.1), I guess I need to build it from source

[realyukii]

the error message changed:

$ sudo ./sshfront -a "" -d -h 127.0.0.1 `which echo`
<...>
2025/02/25 05:02:51 handshake failed: [ssh: no auth passed yet]

it still require authentication despite I set -a ""? :"

$ ssh -o PubkeyAcceptedAlgorithms=+ssh-rsa -o HostkeyAlgorithms=+ssh-rsa localhost hemlo
ryuzaki@localhost: Permission denied (publickey).