Golang sFTP SSH：身份验证失败

Question

For 3 days, I have been trying to set up a sFTP connection to upload a file to a client server.

I'm using this : https://gist.github.com/svett/b7f56afc966a6b6ac2fc

Only difference being that I added :

sshConfig := &ssh.ClientConfig{
    User: "0000003579",
    Auth: []ssh.AuthMethod{
        //SSHAgent(),
        PublicKeyFile("C:\\GoDev\\src\\Texel.ca\\Bnc_Ftp\\.ssh\\id_rsa"),
    },
    HostKeyCallback:   ssh.InsecureIgnoreHostKey(),
    HostKeyAlgorithms: []string{"ssh-dss"},
}
sshConfig.Ciphers = append(sshConfig.Ciphers, "aes128-cbc")

because my client server still use cbc and still use ssh-dss.

My issue :

When trying to connect, I get the following response:

Failed to dial: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain

I tried to connect with the same credential via openSSH in a command line

ssh -oHostKeyAlgorithms=+ssh-dss ***@2XXX.XXX.XXX.XX -vvv

and it works.

Can I get more infos on my error like the -vvv command with openSSH? Or do any of you have an idea?

Thank you!

EDIT

Just for more information, there is a working tool right now that does the sftp transfert and it works.

But it's a .bat file that's why we are changing it to go.

It use WinSCP to connect to the sFTP with a rsa putty private key.

That might be one of the issue, as if I understand correctly, I can't use a puTTy private key with golang ssh package.

So I tried both the putty key and a conversion to openSSH, but both won't work.

Answer 1

With openssh you're adding dss to the algorithms, and are using an unknown key. This key will be your default for the user and probably not the one you're using on the go side?

On the Go side you're using only the dss Algorithm and an rsa key, which might be the problem?

Make sure you're using the same key and same algorithms in both cases and that the algorithm matches the key.

If still stuck perhaps post the full output of -vvv and all the errors on the go side.