Dart

SSH Authenticate with Password and Private Key

Demonstrates the Chilkat Ssh.AuthenticatePwPk method, which authenticates with a server that requires both a password and a private key. The first argument is the username, the second is the password, and the third is an SshKey private key.

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

Background: Most servers require either a password or a public key, not both — but some high-security configurations mandate multi-factor SSH, combining something you know (the password) with something you have (the key). This method satisfies that policy in one call. As always, the password should come from a secure source rather than a literal in code.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Ssh.AuthenticatePwPk method, which authenticates with a server that requires
  // BOTH a password and a private key.  The 1st argument is the username, the 2nd is the
  // password, and the 3rd is an SshKey private key.

  final ssh = CkSsh();

  // Connect to the SSH server.  Port 22 is the usual SSH port.
  final sshPort = 22;
  try {
    ssh.connect('ssh.example.com', sshPort);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Normally you would not hard-code the password in source.  You should instead obtain it
  // from an interactive prompt, environment variable, or a secrets vault.
  final password = 'mySshPassword';

  // Load the SSH private key.  LoadText reads the file's text, which is then imported.
  final privKey = CkSshKey();
  final String keyStr;
  try {
    keyStr = privKey.loadText('qa_data/id_rsa');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    privKey.fromOpenSshPrivateKey(keyStr);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    ssh.authenticatePwPk('mySshLogin', password, privKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Authenticated with password and private key.');

  ssh.disconnect();
}