React Native

SFTP Authenticate with a SecureString Password

Demonstrates the Chilkat SFtp.AuthenticateSecPw method, which authenticates using SecureString login and password objects. The first argument is the login and the second is the password.

Background: A SecureString keeps the credential encrypted in memory, reducing the chance of a plaintext password lingering in the process. The behavior otherwise matches AuthenticatePw; only the credential handling is more protective. Populate the SecureString from a value obtained at runtime, not a hard-coded literal.

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import { SFtp, SecureString } from '@chilkat/react-native'

async function chilkatExample() {
  // Demonstrates the SFtp.AuthenticateSecPw method, which authenticates using SecureString login
  // and password objects.  The 1st argument is the login and the 2nd is the password.

  const sftp = new SFtp();

  // Step 1: Connect the SSH transport.  Port 22 is the usual port.
  const port = 22;
  try {
    await sftp.connectAsync('sftp.example.com', port);
  } catch {
    console.log(sftp.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.
  const password = 'mySshPassword';

  // Place the login and password into SecureString objects.
  const secureLogin = new SecureString();
  secureLogin.append('mySshLogin');
  const securePassword = new SecureString();
  securePassword.append(password);

  try {
    await sftp.authenticateSecPwAsync(secureLogin, securePassword);
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  // Step 3: Open the SFTP subsystem.  This must be done after authentication and before any
  // file or directory operations.
  try {
    await sftp.initializeSftpAsync();
  } catch {
    console.log(sftp.lastErrorText);
    return;
  }

  console.log('Authenticated with secure strings.');

  sftp.disconnect();
}