Android™

SSH Authenticate with a Private Key

Demonstrates the Chilkat Ssh.AuthenticatePk method, which authenticates a connected SSH session using public-key authentication. The first argument is the username and the second is an SshKey private key. The matching public key must already be authorized for the account on the server.

Note: The private-key path is relative to the application's current working directory. Supply the path to your own key file.

Background: Public-key authentication is the standard for unattended and automated SSH: the private key stays on the client, the server trusts the corresponding public key, and no reusable password crosses the wire. The SshKey object imports keys in several formats — this example loads an OpenSSH private key. An empty or public-only key is rejected locally.

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// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    boolean success = false;

    //  Demonstrates the Ssh.AuthenticatePk method, which authenticates a connected SSH session using
    //  public-key authentication.  The 1st argument is the username and the 2nd is an SshKey private
    //  key.  The matching public key must already be authorized for the account on the server.

    CkSsh ssh = new CkSsh();

    //  Connect to the SSH server.  Port 22 is the usual SSH port.
    int sshPort = 22;
    success = ssh.Connect("ssh.example.com",sshPort);
    if (success == false) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    //  Load the SSH private key.  LoadText reads the file's text, which is then imported.
    CkSshKey privKey = new CkSshKey();
    String keyStr = privKey.loadText("qa_data/id_rsa");
    if (privKey.get_LastMethodSuccess() == false) {
        Log.i(TAG, privKey.lastErrorText());
        return;
        }

    success = privKey.FromOpenSshPrivateKey(keyStr);
    if (success == false) {
        Log.i(TAG, privKey.lastErrorText());
        return;
        }

    success = ssh.AuthenticatePk("mySshLogin",privKey);
    if (success == false) {
        Log.i(TAG, ssh.lastErrorText());
        return;
        }

    Log.i(TAG, "Authenticated with private key.");

    ssh.Disconnect();

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}