Dart

Set a TLS Client Certificate for IMAP

Demonstrates the Chilkat Imap.SetSslClientCert method, which supplies a client certificate for TLS client-certificate authentication. The only argument is a Cert object that must provide access to its private key. Call it before connecting. This example loads the certificate from a PFX file.

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

Background: Most IMAP servers authenticate with a username and password only. A few high-security deployments additionally require mutual TLS, where the client presents its own certificate during the handshake. Because that happens as part of connecting, the certificate must be set before Connect — setting it afterward has no effect on the already-established connection.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the Imap.SetSslClientCert method, which supplies a client certificate for TLS
  // client-certificate authentication.  The only argument is a Cert object.  It must be called
  // before connecting.

  final imap = CkImap();

  imap.ssl = true;
  imap.port = 993;

  // The PFX password is not hard-coded in source.  Insert code here to obtain it from an
  // interactive prompt, environment variable, or a secrets vault.
  final pfxPassword = '';

  // Load the client certificate (and its private key) from a PFX file.
  final cert = CkCert();
  try {
    cert.loadPfxFile('qa_data/client.pfx', pfxPassword);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Provide the client certificate BEFORE connecting.
  try {
    imap.setSslClientCert(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.connect('imap.example.com');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.login('user@example.com', 'myPassword');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    imap.disconnect();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }
}