Java

Get the SSH Server's Authentication Methods

Demonstrates the Chilkat Ssh.GetAuthMethods method, which queries a connected but unauthenticated SSH server for the authentication methods it advertises. It takes no arguments and returns a lowercase, comma-separated list such as publickey,password,keyboard-interactive. Call it after Connect and before authenticating.

Background: Knowing what the server accepts lets a client choose the right authentication path — for example, falling back to keyboard-interactive when password auth is not offered. Note the documented connection side effect: querying methods advances the SSH authentication state, so call it at the correct point in the sequence.

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Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Ssh;

public class ChilkatExample {

    public static void main(String[] args) {
        // Demonstrates the Ssh.GetAuthMethods method, which queries a connected but unauthenticated SSH
        // server for the authentication methods it advertises.  It takes no arguments and returns a
        // lowercase, comma-separated list such as "publickey,password,keyboard-interactive".

        Ssh ssh = new Ssh();

        // Connect to the SSH server.  Port 22 is the usual SSH port.
        int sshPort = 22;
        String methods;
        try {
            ssh.connect("ssh.example.com", sshPort);

            // Query the advertised authentication methods.  Call after Connect, before authenticating.
            methods = ssh.getAuthMethods();
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("Server auth methods: " + methods);

        ssh.disconnect();
    }
}