| public ChangeSecurityProtocol ( Org.Mentalis.Security.Ssl.SecurityOptions options ) : void | ||
| options | Org.Mentalis.Security.Ssl.SecurityOptions | The new |
| Résultat | void | |
/// <summary>
/// Changes the security protocol. This method can only be used to 'upgrade' a connection from no-security to either SSL or TLS.
/// </summary>
/// <param name="options">The new <see cref="SecurityOptions"/> parameters.</param>
/// <exception cref="SecurityException">An error occurs while changing the security protocol.</exception>
/// <remarks>
/// Programs should only call this method if there is no active <see cref="Read"/> or <see cref="Write"/>!
/// </remarks>
public void ChangeSecurityProtocol(SecurityOptions options)
{
Socket.ChangeSecurityProtocol(options);
}
public void Start()
{
try {
// ask the user for SMTP server, port and the type of connection
Console.Write("Host to connect to: ");
string server = Console.ReadLine().Trim();
Console.Write("Port: ");
string port = Console.ReadLine().Trim();
Console.Write("Connection type [0 = normal connection, 1 = direct TLS connection, 2 = indirect TLS connection (using STARTTLS command)]: ");
string type = Console.ReadLine().Trim();
if (Array.IndexOf(new string[]{"0", "1", "2"}, type) == -1) {
Console.WriteLine("Invalid connection type.");
return;
}
Console.WriteLine("Please enter the email address you wish to send an email to:");
string address = Console.ReadLine().Trim();
// create a new SecurityOptions instance
SecurityOptions options = new SecurityOptions(SecureProtocol.None);
// allow only secure ciphers to be used. Currently, the seure ciphers are:
// the AES algorithm [128 or 256 bit keys], the RC4 algorithm [128 bit keys]
// or TipleDES [168 bit keys]
options.AllowedAlgorithms = SslAlgorithms.SECURE_CIPHERS;
// the SecureSocket should be a client socket
options.Entity = ConnectionEnd.Client;
// we will use manual verification of the server certificate
options.VerificationType = CredentialVerification.Manual;
// when the server certificate is receives, the SecureSocket should call
// the OnVerify method
options.Verifier = new CertVerifyEventHandler(OnVerify);
// use the default flags
options.Flags = SecurityFlags.Default;
// the common name is the domain name or IP address of the server
options.CommonName = server;
// if the user chose a direct TLS connection, set the protocol to TLS1
if (type == "1") {
options.Protocol = SecureProtocol.Tls1;
}
// create the new secure socket
Connection = new SecureSocket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp, options);
// connect to the SMTP server
Connection.Connect(new IPEndPoint(Dns.GetHostEntry(server).AddressList[0], int.Parse(port)));
// wait for the server hello message
if (!IsReplyOK(Receive())) {
Console.WriteLine("Server disallowed connection.");
return;
}
// if the user selected an indirect TLS connection, issue
// a EHLO command. Otherwise, stick to the standard HELO command.
if (type == "2") // STARTTLS connection
Send("EHLO SmtpClient.Mentalis.org\r\n");
else
Send("HELO SmtpClient.Mentalis.org\r\n");
if (!IsReplyOK(Receive())) {
Console.WriteLine("HELLO failed.");
return;
}
// if the user selected an indirect TLS connection, issue
// the STARTTLS command
if (type == "2") {
// send the STARTTLS command to the server
Send("STARTTLS\r\n");
// make sure the server supports the STARTTLS command
if (!IsReplyOK(Receive())) {
Console.WriteLine("STARTTLS failed.");
return;
}
// change the protocol from SecureProtocol.None
// to SecureProtocol.Tls1
options.Protocol = SecureProtocol.Tls1;
// start the TLS handshake
Connection.ChangeSecurityProtocol(options);
// after this line, we're using an encrypted TLS connection
}
// from here on, act as if the SecureSocket is a normal Socket
Send("MAIL FROM: [email protected]\r\n"); // [email protected] is not a real email address
if (!IsReplyOK(Receive())) {
Console.WriteLine("MAIL FROM failed.");
return;
}
Send("RCPT TO:" + address + "\r\n");
if (!IsReplyOK(Receive())) {
Console.WriteLine("RCPT TO failed.");
return;
}
Send("DATA\r\n");
if (!IsReplyOK(Receive())) {
Console.WriteLine("DATA failed.");
return;
}
Send(TestMail.Replace("#ADDRESS#", address) + "\r\n.\r\n");
if (!IsReplyOK(Receive())) {
Console.WriteLine("Sending of e-mail failed.");
return;
}
Send("QUIT\r\n");
if (!IsReplyOK(Receive())) {
Console.WriteLine("QUIT failed.");
}
Connection.Shutdown(SocketShutdown.Both);
} catch (Exception e) {
Console.WriteLine("An error occurred [" + e.Message + "]");
Console.WriteLine(e);
} finally {
if (Connection != null) {
Connection.Close();
}
}
}
