public void HandshakeCompletionShouldBeLoggedWithCipherDetails()
{
var smtpClientSimulator = new TcpConnection();
smtpClientSimulator.Connect(25002);
var banner = smtpClientSimulator.Receive();
var capabilities1 = smtpClientSimulator.SendAndReceive("EHLO example.com\r\n");
Assert.IsTrue(capabilities1.Contains("STARTTLS"));
smtpClientSimulator.SendAndReceive("STARTTLS\r\n");
smtpClientSimulator.HandshakeAsClient();
var capabilities2 = smtpClientSimulator.SendAndReceive("EHLO example.com\r\n");
var default_log = LogHandler.ReadCurrentDefaultLog();
Assert.IsTrue(default_log.Contains("Version: TLS"));
Assert.IsTrue(default_log.Contains("Cipher: "));
Assert.IsTrue(default_log.Contains("Bits: "));
}
public void Send(bool useStartTls, string username, string password, string sFrom, string sTo, string sSubject, string sBody, out string errorMessage)
{
string sData;
_tcpConnection.Connect(_ipaddress, _port);
// Receive welcome message.
var welcomeMessage = _tcpConnection.Receive();
if (!welcomeMessage.StartsWith("220") || !welcomeMessage.EndsWith("\r\n"))
{
throw new Exception("Received unexpected welcome message: " + welcomeMessage);
}
if (useStartTls)
{
var capabilities1 = SendAndReceive("EHLO example.com\r\n");
if (!capabilities1.Contains("STARTTLS"))
{
throw new DeliveryFailedException("Server does not support STARTTLS.");
}
SendAndReceive("STARTTLS\r\n");
_tcpConnection.HandshakeAsClient();
}
if (!string.IsNullOrEmpty(username))
{
if (!Logon(EncodeBase64(username), EncodeBase64(password), out errorMessage))
{
throw new DeliveryFailedException("Login failed: " + errorMessage);
}
}
_tcpConnection.Send("HELO example.com\r\n");
var helloResponse = _tcpConnection.Receive();
if (helloResponse != "250 Hello.\r\n")
{
throw new DeliveryFailedException("Unexpected response to HELO from server: " + helloResponse);
}
// User
_tcpConnection.Send("MAIL FROM:<" + sFrom + ">\r\n");
var mailFromResponse = _tcpConnection.Receive();
if (mailFromResponse != "250 OK\r\n")
{
throw new DeliveryFailedException("Unexpected response to HELO from server: " + helloResponse);
}
_tcpConnection.Send("RCPT TO:<" + sTo + ">\r\n");
var rcptToResponse = _tcpConnection.Receive();
if (!rcptToResponse.StartsWith("2") || !rcptToResponse.EndsWith("\r\n"))
{
errorMessage = TrimNewlline(rcptToResponse);
throw new DeliveryFailedException("Unexpected response from server: " + errorMessage);
}
// Select inbox
_tcpConnection.Send("DATA\r\n");
var dataResponse = _tcpConnection.Receive();
if (!dataResponse.StartsWith("354") || !dataResponse.EndsWith("\r\n"))
{
errorMessage = TrimNewlline(dataResponse);
throw new DeliveryFailedException("Unexpected response from server: " + errorMessage);
}
_tcpConnection.Send("From: " + sFrom + "\r\n");
_tcpConnection.Send("To: " + sTo + "\r\n");
_tcpConnection.Send("Subject: " + sSubject + "\r\n");
_tcpConnection.Send("\r\n");
// Send body
_tcpConnection.Send(sBody);
_tcpConnection.Send("\r\n");
_tcpConnection.Send(".\r\n");
// Wait for OK.
sData = _tcpConnection.Receive();
if (sData.Substring(0, 3) != "250")
{
errorMessage = TrimNewlline(sData);
throw new DeliveryFailedException("Unexpected response from server: " + errorMessage);
}
// Quit again
_tcpConnection.Send("QUIT\r\n");
_tcpConnection.Receive();
_tcpConnection.Disconnect();
errorMessage = "";
}
public void Handshake()
{
_tcpConnection.HandshakeAsClient();
}
public void IfStlsRequiredLogonShouldSucceedIfStls()
{
var smtpClientSimulator = new TcpConnection();
smtpClientSimulator.Connect(25003);
var banner = smtpClientSimulator.Receive();
var capabilities1 = smtpClientSimulator.SendAndReceive("EHLO example.com\r\n");
Assert.IsTrue(capabilities1.Contains("STARTTLS"));
smtpClientSimulator.SendAndReceive("STARTTLS\r\n");
smtpClientSimulator.HandshakeAsClient();
var loginResult = smtpClientSimulator.SendAndReceive("AUTH LOGIN\r\n");
Assert.IsTrue(loginResult.StartsWith("334"));
}
public void StartTlsCommandShouldSwithToTls()
{
var smtpClientSimulator = new TcpConnection();
smtpClientSimulator.Connect(25002);
var banner = smtpClientSimulator.Receive();
var capabilities1 = smtpClientSimulator.SendAndReceive("EHLO example.com\r\n");
Assert.IsTrue(capabilities1.Contains("STARTTLS"));
smtpClientSimulator.SendAndReceive("STARTTLS\r\n");
smtpClientSimulator.HandshakeAsClient();
// Send a command over TLS.
var capabilities2 = smtpClientSimulator.SendAndReceive("EHLO example.com\r\n");
Assert.IsFalse(capabilities2.Contains("STARTTLS"));
// We're now on SSL.
}
public void TestPlaintextCommandInjection()
{
var smtpClientSimulator = new TcpConnection();
smtpClientSimulator.Connect(25002);
var banner = smtpClientSimulator.Receive();
var capabilities1 = smtpClientSimulator.SendAndReceive("EHLO example.com\r\n");
Assert.IsTrue(capabilities1.Contains("STARTTLS"));
var resp = smtpClientSimulator.SendAndReceive("STARTTLS\r\nRSET\r\n");
Assert.AreEqual("220 Ready to start TLS\r\n", resp);
smtpClientSimulator.HandshakeAsClient();
var quitResponse = smtpClientSimulator.SendAndReceive("QUIT\r\n");
Assert.AreEqual(quitResponse, "221 goodbye\r\n");
var default_log = LogHandler.ReadCurrentDefaultLog();
Assert.IsFalse(default_log.Contains("RSET"));
}
public bool Send(bool useStartTls, string username, string password, string sFrom, string sTo, string sSubject, string sBody, out string result)
{
string sData;
_tcpConnection.Connect(_ipaddress, _port);
// Receive welcome message.
_tcpConnection.Receive();
if (useStartTls)
{
var capabilities1 = SendAndReceive("EHLO example.com\r\n");
CustomAssert.IsTrue(capabilities1.Contains("STARTTLS"));
SendAndReceive("STARTTLS\r\n");
CustomAssert.IsTrue(_tcpConnection.HandshakeAsClient());
}
if (!string.IsNullOrEmpty(username))
{
if (!Logon(EncodeBase64(username), EncodeBase64(password), out result))
{
return(false);
}
}
_tcpConnection.Send("HELO example.com\r\n");
sData = _tcpConnection.Receive();
// User
_tcpConnection.Send("MAIL FROM:<" + sFrom + ">\r\n");
sData = _tcpConnection.Receive();
_tcpConnection.Send("RCPT TO:<" + sTo + ">\r\n");
sData = _tcpConnection.Receive();
if (sData.StartsWith("2") == false)
{
result = TrimNewlline(sData);
return(false);
}
// Select inbox
_tcpConnection.Send("DATA\r\n");
_tcpConnection.Receive();
_tcpConnection.Send("From: " + sFrom + "\r\n");
_tcpConnection.Send("To: " + sTo + "\r\n");
_tcpConnection.Send("Subject: " + sSubject + "\r\n");
_tcpConnection.Send("\r\n");
// Send body
_tcpConnection.Send(sBody);
_tcpConnection.Send("\r\n");
_tcpConnection.Send(".\r\n");
// Wait for OK.
sData = _tcpConnection.Receive();
if (sData.Substring(0, 3) != "250")
{
result = TrimNewlline(sData);
return(false);
}
// Quit again
_tcpConnection.Send("QUIT\r\n");
_tcpConnection.Receive();
_tcpConnection.Disconnect();
result = "";
return(true);
}
