Dart

SFTP Authentication using X.509 Certificates

See more SFTP Examples

Demonstrates how to authenticate with an SSH/SFTP server using an certificate's private key.

Note: See X.509v3 Certificates for SSH Authentication for more information.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  final sftp = CkSFtp();

  final hostname = 'sftp.example.com';
  final port = 22;
  try {
    sftp.connect(hostname, port);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Load the cert + private key from a .pfx.
  // Note: Chilkat provides methods for loading certs and private keys from many sources, including smart cards and USB tokens (HSM's)
  final cert = CkCert();
  try {
    cert.loadPfxFile('qa_data/pfx/example.pfx', 'pfx_password');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Get the cert's private key (as PEM) to be used for SSH authentication.
  // (The public key is installed on the server.)
  final String privKeyPem;
  try {
    privKeyPem = cert.getPrivateKeyPem();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final key = CkSshKey();

  // Load a private key from a PEM string:
  try {
    key.fromOpenSshPrivateKey(privKeyPem);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Authenticate with the SSH server.
  try {
    sftp.authenticatePk('myLogin', key);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Public-Key Authentication Successful!');
}