public async Task <StartTlsResult> TryStartTls(Stream networkStream)
{
try
{
using (IStreamReader streamReader =
new StreamReaderWrapper(networkStream, Encoding.ASCII, true, 1024, true))
{
using (IStreamWriter streamWriter =
new StreamWriterWrapper(networkStream, Encoding.ASCII, 1024, true)
{
AutoFlush = true,
NewLine = LineEnding
})
{
SmtpResponse response1 = await _smtpDeserializer.Deserialize(streamReader);
_log.Debug($"<: {response1}");
if (response1.Responses.FirstOrDefault()?.ResponseCode != ResponseCode.ServiceReady)
{
return(new StartTlsResult(false, response1.Responses.Select(_ => _.ToString()).ToList(),
"The server did not present a service ready response code (220)."));
}
EhloCommand ehloCommand = new EhloCommand(_mxSecurityTesterConfig.SmtpHostName);
_log.Debug($">: {ehloCommand.CommandString}");
await _smtpSerializer.Serialize(ehloCommand, streamWriter);
SmtpResponse response2 = await _smtpDeserializer.Deserialize(streamReader);
_log.Debug($"<: {response2}");
if (!response2.Responses.Any(_ =>
_.Value.ToLower() == Starttls && _.ResponseCode == ResponseCode.Ok))
{
return(new StartTlsResult(false, response2.Responses.Select(_ => _.ToString()).ToList(),
"The server did not present a STARTTLS command with a response code (250)."));
}
StartTlsCommand startTlsCommand = new StartTlsCommand();
_log.Debug($">: {startTlsCommand.CommandString}");
await _smtpSerializer.Serialize(startTlsCommand, streamWriter);
SmtpResponse response3 = await _smtpDeserializer.Deserialize(streamReader);
_log.Debug($"<: {response3}");
return(new StartTlsResult(
response3.Responses.FirstOrDefault()?.ResponseCode == ResponseCode.ServiceReady,
response3.Responses.Select(_ => _.Value).ToList(), string.Empty));
}
}
}
catch (Exception e)
{
_log.Error(
$"SMTP session initalization failed with error: {e.Message} {Environment.NewLine} {e.StackTrace}");
return(new StartTlsResult(false, null, e.Message));
}
}
public async Task InitalResponseIsntServiceReadyReturnsFalse()
{
A.CallTo(() => _smtpDeserializer.Deserialize(A <IStreamReader> ._)).Returns(
Task.FromResult(new SmtpResponse(new List <Response> {
_unknownReponse
})));
StartTlsResult result = await _smtpClient.TryStartTls(Stream.Null);
Assert.That(result.Success, Is.False);
}