private CommandStream.PipelineInstruction QueueOrCreateFtpDataStream(ref Stream stream)
{
if (this.m_DataSocket == null)
{
throw new InternalException();
}
if (this.m_TlsStream != null)
{
stream = new FtpDataStream(this.m_TlsStream, (FtpWebRequest)base.m_Request, this.IsFtpDataStreamWriteable());
this.m_TlsStream = null;
return(CommandStream.PipelineInstruction.GiveStream);
}
NetworkStream networkStream = new NetworkStream(this.m_DataSocket, true);
if (base.UsingSecureStream)
{
FtpWebRequest initiatingRequest = (FtpWebRequest)base.m_Request;
TlsStream stream3 = new TlsStream(initiatingRequest.RequestUri.Host, networkStream, initiatingRequest.ClientCertificates, base.Pool.ServicePoint, initiatingRequest, base.m_Async ? initiatingRequest.GetWritingContext().ContextCopy : null);
networkStream = stream3;
if (base.m_Async)
{
this.m_TlsStream = stream3;
LazyAsyncResult result = new LazyAsyncResult(null, this, m_SSLHandshakeCallback);
stream3.ProcessAuthentication(result);
return(CommandStream.PipelineInstruction.Pause);
}
stream3.ProcessAuthentication(null);
}
stream = new FtpDataStream(networkStream, (FtpWebRequest)base.m_Request, this.IsFtpDataStreamWriteable());
return(CommandStream.PipelineInstruction.GiveStream);
}
protected override void ClearState()
{
this.m_ContentLength = -1L;
this.m_LastModified = DateTime.MinValue;
this.m_ResponseUri = null;
this.m_DataHandshakeStarted = false;
this.StatusCode = FtpStatusCode.Undefined;
this.StatusLine = null;
this.m_DataSocket = null;
this.m_PassiveEndPoint = null;
this.m_TlsStream = null;
base.ClearState();
}
protected override void ClearState()
{
_contentLength = -1;
_lastModified = DateTime.MinValue;
_responseUri = null;
_dataHandshakeStarted = false;
StatusCode = FtpStatusCode.Undefined;
StatusLine = null;
_dataSocket = null;
_passiveEndPoint = null;
_tlsStream = null;
base.ClearState();
}
protected override void ProcessAsSsl3()
{
// Client Version
this.Write(this.Context.Protocol);
// Random bytes - Unix time + Radom bytes [28]
TlsStream clientRandom = new TlsStream();
clientRandom.Write(this.Context.GetUnixTime());
clientRandom.Write(this.Context.GetSecureRandomBytes(28));
this.random = clientRandom.ToArray();
clientRandom.Reset();
this.Write(this.random);
// Session id
// Check if we have a cache session we could reuse
this.Context.SessionId = ClientSessionCache.FromHost (this.Context.ClientSettings.TargetHost);
if (this.Context.SessionId != null)
{
this.Write((byte)this.Context.SessionId.Length);
if (this.Context.SessionId.Length > 0)
{
this.Write(this.Context.SessionId);
}
}
else
{
this.Write((byte)0);
}
// Write length of Cipher suites
this.Write((short)(this.Context.SupportedCiphers.Count*2));
// Write Supported Cipher suites
for (int i = 0; i < this.Context.SupportedCiphers.Count; i++)
{
this.Write((short)this.Context.SupportedCiphers[i].Code);
}
// Compression methods length
this.Write((byte)1);
// Compression methods ( 0 = none )
this.Write((byte)this.Context.CompressionMethod);
}
internal bool AcceptCertificate(TlsStream secureStream, WebRequest request)
{
X509Certificate newCertificate = secureStream.Certificate;
if (ServicePointManager.CertificatePolicy != null)
{
PolicyWrapper cpw = new PolicyWrapper(ServicePointManager.CertificatePolicy, this, request);
bool acceptable = secureStream.VerifyServerCertificate(cpw);
if (!acceptable)
{
return(false);
}
}
m_ServerCertificate = newCertificate;
m_ClientCertificate = secureStream.ClientCertificate;
return(true);
}
// Creates a FtpDataStream object, constructs a TLS stream if needed.
// In case SSL and ASYNC we delay sigaling the user stream until the handshake is done.
private PipelineInstruction QueueOrCreateFtpDataStream(ref Stream stream)
{
if (_dataSocket == null)
{
throw new InternalException();
}
//
// Re-entered pipeline with completed read on the TlsStream
//
if (_tlsStream != null)
{
stream = new FtpDataStream(_tlsStream, (FtpWebRequest)_request, IsFtpDataStreamWriteable());
_tlsStream = null;
return(PipelineInstruction.GiveStream);
}
NetworkStream networkStream = new NetworkStream(_dataSocket, true);
if (UsingSecureStream)
{
FtpWebRequest request = (FtpWebRequest)_request;
TlsStream tlsStream = new TlsStream(networkStream, _dataSocket, request.RequestUri.Host, request.ClientCertificates);
networkStream = tlsStream;
if (_isAsync)
{
_tlsStream = tlsStream;
tlsStream.BeginAuthenticateAsClient(s_SSLHandshakeCallback, this);
return(PipelineInstruction.Pause);
}
else
{
tlsStream.AuthenticateAsClient();
}
}
stream = new FtpDataStream(networkStream, (FtpWebRequest)_request, IsFtpDataStreamWriteable());
return(PipelineInstruction.GiveStream);
}
private CommandStream.PipelineInstruction QueueOrCreateFtpDataStream(ref Stream stream)
{
if (this.m_DataSocket == null)
{
throw new InternalException();
}
if (this.m_TlsStream != null)
{
stream = new FtpDataStream(this.m_TlsStream, (FtpWebRequest) base.m_Request, this.IsFtpDataStreamWriteable());
this.m_TlsStream = null;
return CommandStream.PipelineInstruction.GiveStream;
}
NetworkStream networkStream = new NetworkStream(this.m_DataSocket, true);
if (base.UsingSecureStream)
{
FtpWebRequest initiatingRequest = (FtpWebRequest) base.m_Request;
TlsStream stream3 = new TlsStream(initiatingRequest.RequestUri.Host, networkStream, initiatingRequest.ClientCertificates, base.Pool.ServicePoint, initiatingRequest, base.m_Async ? initiatingRequest.GetWritingContext().ContextCopy : null);
networkStream = stream3;
if (base.m_Async)
{
this.m_TlsStream = stream3;
LazyAsyncResult result = new LazyAsyncResult(null, this, m_SSLHandshakeCallback);
stream3.ProcessAuthentication(result);
return CommandStream.PipelineInstruction.Pause;
}
stream3.ProcessAuthentication(null);
}
stream = new FtpDataStream(networkStream, (FtpWebRequest) base.m_Request, this.IsFtpDataStreamWriteable());
return CommandStream.PipelineInstruction.GiveStream;
}
protected override CommandStream.PipelineInstruction PipelineCallback(CommandStream.PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
if (response == null)
{
return(CommandStream.PipelineInstruction.Abort);
}
FtpStatusCode status = (FtpStatusCode)response.Status;
if (status != FtpStatusCode.ClosingControl)
{
this.StatusCode = status;
this.StatusLine = response.StatusDescription;
}
if (response.InvalidStatusCode)
{
throw new WebException(SR.GetString("net_InvalidStatusCode"), WebExceptionStatus.ProtocolError);
}
if (base.m_Index == -1)
{
switch (status)
{
case FtpStatusCode.SendUserCommand:
this.m_BannerMessage = new StringBuilder();
this.m_BannerMessage.Append(this.StatusLine);
return(CommandStream.PipelineInstruction.Advance);
case FtpStatusCode.ServiceTemporarilyNotAvailable:
return(CommandStream.PipelineInstruction.Reread);
}
throw base.GenerateException(status, response.StatusDescription, null);
}
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion)
{
base.Encoding = Encoding.UTF8;
}
else
{
base.Encoding = Encoding.Default;
}
return(CommandStream.PipelineInstruction.Advance);
}
if (entry.Command.IndexOf("USER") != -1)
{
if (status == FtpStatusCode.LoggedInProceed)
{
this.m_LoginState = FtpLoginState.LoggedIn;
base.m_Index++;
}
else if ((status == FtpStatusCode.NotLoggedIn) && (this.m_LoginState != FtpLoginState.NotLoggedIn))
{
this.m_LoginState = FtpLoginState.ReloginFailed;
throw ExceptionHelper.IsolatedException;
}
}
if (response.TransientFailure || response.PermanentFailure)
{
if (status == FtpStatusCode.ServiceNotAvailable)
{
base.MarkAsRecoverableFailure();
}
throw base.GenerateException(status, response.StatusDescription, null);
}
if ((this.m_LoginState != FtpLoginState.LoggedIn) && (entry.Command.IndexOf("PASS") != -1))
{
switch (status)
{
case FtpStatusCode.NeedLoginAccount:
case FtpStatusCode.LoggedInProceed:
this.m_LoginState = FtpLoginState.LoggedIn;
goto Label_017A;
}
throw base.GenerateException(status, response.StatusDescription, null);
}
Label_017A:
if (entry.HasFlag(CommandStream.PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool flag;
CommandStream.PipelineInstruction instruction = this.QueueOrCreateDataConection(entry, response, timeout, ref stream, out flag);
if (!flag)
{
return(instruction);
}
}
switch (status)
{
case FtpStatusCode.OpeningData:
case FtpStatusCode.DataAlreadyOpen:
{
if (this.m_DataSocket == null)
{
return(CommandStream.PipelineInstruction.Abort);
}
if (!entry.HasFlag(CommandStream.PipelineEntryFlags.GiveDataStream))
{
base.m_AbortReason = SR.GetString("net_ftp_invalid_status_response", new object[] { status, entry.Command });
return(CommandStream.PipelineInstruction.Abort);
}
this.TryUpdateContentLength(response.StatusDescription);
FtpWebRequest request = (FtpWebRequest)base.m_Request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
this.TryUpdateResponseUri(response.StatusDescription, request);
}
return(this.QueueOrCreateFtpDataStream(ref stream));
}
case FtpStatusCode.LoggedInProceed:
this.m_WelcomeMessage.Append(this.StatusLine);
break;
case FtpStatusCode.ClosingControl:
this.m_ExitMessage.Append(response.StatusDescription);
base.CloseSocket();
break;
case FtpStatusCode.ServerWantsSecureSession:
{
FtpWebRequest initiatingRequest = (FtpWebRequest)base.m_Request;
TlsStream stream2 = new TlsStream(initiatingRequest.RequestUri.Host, base.NetworkStream, initiatingRequest.ClientCertificates, base.Pool.ServicePoint, initiatingRequest, base.m_Async ? initiatingRequest.GetWritingContext().ContextCopy : null);
base.NetworkStream = stream2;
break;
}
case FtpStatusCode.FileStatus:
{
FtpWebRequest request1 = (FtpWebRequest)base.m_Request;
if (entry.Command.StartsWith("SIZE "))
{
this.m_ContentLength = this.GetContentLengthFrom213Response(response.StatusDescription);
}
else if (entry.Command.StartsWith("MDTM "))
{
this.m_LastModified = this.GetLastModifiedFrom213Response(response.StatusDescription);
}
break;
}
default:
if (status == FtpStatusCode.PathnameCreated)
{
if ((entry.Command == "PWD\r\n") && !entry.HasFlag(CommandStream.PipelineEntryFlags.UserCommand))
{
this.m_LoginDirectory = this.GetLoginDirectory(response.StatusDescription);
}
}
else if (entry.Command.IndexOf("CWD") != -1)
{
this.m_EstablishedServerDirectory = this.m_RequestedServerDirectory;
}
break;
}
if (!response.PositiveIntermediate && (base.UsingSecureStream || !(entry.Command == "AUTH TLS\r\n")))
{
return(CommandStream.PipelineInstruction.Advance);
}
return(CommandStream.PipelineInstruction.Reread);
}
internal void GetConnection(string host, int port)
{
if (_isConnected)
{
throw new InvalidOperationException(SR.SmtpAlreadyConnected);
}
InitializeConnection(host, port);
_responseReader = new SmtpReplyReaderFactory(_networkStream);
LineInfo info = _responseReader.GetNextReplyReader().ReadLine();
switch (info.StatusCode)
{
case SmtpStatusCode.ServiceReady:
break;
default:
throw new SmtpException(info.StatusCode, info.Line, true);
}
try
{
_extensions = EHelloCommand.Send(this, _client.clientDomain);
ParseExtensions(_extensions);
}
catch (SmtpException e)
{
if ((e.StatusCode != SmtpStatusCode.CommandUnrecognized)
&& (e.StatusCode != SmtpStatusCode.CommandNotImplemented))
{
throw e;
}
HelloCommand.Send(this, _client.clientDomain);
//if ehello isn't supported, assume basic login
_supportedAuth = SupportedAuth.Login;
}
if (_enableSsl)
{
if (!_serverSupportsStartTls)
{
// Either TLS is already established or server does not support TLS
if (!(_networkStream is TlsStream))
{
throw new SmtpException(SR.MailServerDoesNotSupportStartTls);
}
}
StartTlsCommand.Send(this);
TlsStream tlsStream = new TlsStream(_networkStream, _tcpClient.Client, host, _clientCertificates);
tlsStream.AuthenticateAsClient();
_networkStream = tlsStream;
_responseReader = new SmtpReplyReaderFactory(_networkStream);
// According to RFC 3207: The client SHOULD send an EHLO command
// as the first command after a successful TLS negotiation.
_extensions = EHelloCommand.Send(this, _client.clientDomain);
ParseExtensions(_extensions);
}
// if no credentials were supplied, try anonymous
// servers don't appear to anounce that they support anonymous login.
if (_credentials != null)
{
for (int i = 0; i < _authenticationModules.Length; i++)
{
//only authenticate if the auth protocol is supported - chadmu
if (!AuthSupported(_authenticationModules[i]))
{
continue;
}
NetworkCredential credential = _credentials.GetCredential(host, port, _authenticationModules[i].AuthenticationType);
if (credential == null)
continue;
Authorization auth = SetContextAndTryAuthenticate(_authenticationModules[i], credential, null);
if (auth != null && auth.Message != null)
{
info = AuthCommand.Send(this, _authenticationModules[i].AuthenticationType, auth.Message);
if (info.StatusCode == SmtpStatusCode.CommandParameterNotImplemented)
{
continue;
}
while ((int)info.StatusCode == 334)
{
auth = _authenticationModules[i].Authenticate(info.Line, null, this, _client.TargetName, _channelBindingToken);
if (auth == null)
{
throw new SmtpException(SR.SmtpAuthenticationFailed);
}
info = AuthCommand.Send(this, auth.Message);
if ((int)info.StatusCode == 235)
{
_authenticationModules[i].CloseContext(this);
_isConnected = true;
return;
}
}
}
}
}
_isConnected = true;
}
/// <summary>
/// <para>Cleans up state variables for reuse of the connection</para>
/// </summary>
protected override void ClearState() {
m_ContentLength = -1;
m_LastModified = DateTime.MinValue;
m_ResponseUri = null;
m_DataHandshakeStarted = false;
StatusCode = FtpStatusCode.Undefined;
StatusLine = null;
m_DataSocket = null;
m_PassiveEndPoint = null;
m_TlsStream = null;
base.ClearState();
}
// This is called by underlying base class code, each time a new response is received from the wire or a protocol stage is resumed.
// This function controls the setting up of a data socket/connection, and of saving off the server responses.
protected override PipelineInstruction PipelineCallback(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
if (NetEventSource.IsEnabled) NetEventSource.Info(this, $"Command:{entry?.Command} Description:{response?.StatusDescription}");
// null response is not expected
if (response == null)
return PipelineInstruction.Abort;
FtpStatusCode status = (FtpStatusCode)response.Status;
//
// Update global "current status" for FtpWebRequest
//
if (status != FtpStatusCode.ClosingControl)
{
// A 221 status won't be reflected on the user FTP response
// Anything else will (by design?)
StatusCode = status;
StatusLine = response.StatusDescription;
}
// If the status code is outside the range defined in RFC (1xx to 5xx) throw
if (response.InvalidStatusCode)
throw new WebException(SR.net_InvalidStatusCode, WebExceptionStatus.ProtocolError);
// Update the banner message if any, this is a little hack because the "entry" param is null
if (_index == -1)
{
if (status == FtpStatusCode.SendUserCommand)
{
_bannerMessage = new StringBuilder();
_bannerMessage.Append(StatusLine);
return PipelineInstruction.Advance;
}
else if (status == FtpStatusCode.ServiceTemporarilyNotAvailable)
{
return PipelineInstruction.Reread;
}
else
throw GenerateException(status, response.StatusDescription, null);
}
//
// Check for the result of our attempt to use UTF8
//
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion)
{
Encoding = Encoding.UTF8;
}
else
{
Encoding = Encoding.Default;
}
return PipelineInstruction.Advance;
}
// If we are already logged in and the server returns 530 then
// the server does not support re-issuing a USER command,
// tear down the connection and start all over again
if (entry.Command.IndexOf("USER") != -1)
{
// The server may not require a password for this user, so bypass the password command
if (status == FtpStatusCode.LoggedInProceed)
{
_loginState = FtpLoginState.LoggedIn;
_index++;
}
}
//
// Throw on an error with possible recovery option
//
if (response.TransientFailure || response.PermanentFailure)
{
if (status == FtpStatusCode.ServiceNotAvailable)
{
MarkAsRecoverableFailure();
}
throw GenerateException(status, response.StatusDescription, null);
}
if (_loginState != FtpLoginState.LoggedIn
&& entry.Command.IndexOf("PASS") != -1)
{
// Note the fact that we logged in
if (status == FtpStatusCode.NeedLoginAccount || status == FtpStatusCode.LoggedInProceed)
_loginState = FtpLoginState.LoggedIn;
else
throw GenerateException(status, response.StatusDescription, null);
}
//
// Parse special cases
//
if (entry.HasFlag(PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool isSocketReady;
PipelineInstruction result = QueueOrCreateDataConection(entry, response, timeout, ref stream, out isSocketReady);
if (!isSocketReady)
return result;
// otheriwse we have a stream to create
}
//
// This is part of the above case and it's all about giving data stream back
//
if (status == FtpStatusCode.OpeningData || status == FtpStatusCode.DataAlreadyOpen)
{
if (_dataSocket == null)
{
return PipelineInstruction.Abort;
}
if (!entry.HasFlag(PipelineEntryFlags.GiveDataStream))
{
_abortReason = SR.Format(SR.net_ftp_invalid_status_response, status, entry.Command);
return PipelineInstruction.Abort;
}
// Parse out the Content length, if we can
TryUpdateContentLength(response.StatusDescription);
// Parse out the file name, when it is returned and use it for our ResponseUri
FtpWebRequest request = (FtpWebRequest)_request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
TryUpdateResponseUri(response.StatusDescription, request);
}
return QueueOrCreateFtpDataStream(ref stream);
}
//
// Parse responses by status code exclusivelly
//
// Update welcome message
if (status == FtpStatusCode.LoggedInProceed)
{
_welcomeMessage.Append(StatusLine);
}
// OR set the user response ExitMessage
else if (status == FtpStatusCode.ClosingControl)
{
_exitMessage.Append(response.StatusDescription);
// And close the control stream socket on "QUIT"
CloseSocket();
}
// OR set us up for SSL/TLS, after this we'll be writing securely
else if (status == FtpStatusCode.ServerWantsSecureSession)
{
// If NetworkStream is a TlsStream, then this must be in the async callback
// from completing the SSL handshake.
// So just let the pipeline continue.
if (!(NetworkStream is TlsStream))
{
FtpWebRequest request = (FtpWebRequest)_request;
TlsStream tlsStream = new TlsStream(NetworkStream, Socket, request.RequestUri.Host, request.ClientCertificates);
if (_isAsync)
{
tlsStream.BeginAuthenticateAsClient(ar =>
{
try
{
tlsStream.EndAuthenticateAsClient(ar);
NetworkStream = tlsStream;
this.ContinueCommandPipeline();
}
catch (Exception e)
{
this.CloseSocket();
this.InvokeRequestCallback(e);
}
}, null);
return PipelineInstruction.Pause;
}
else
{
tlsStream.AuthenticateAsClient();
NetworkStream = tlsStream;
}
}
}
// OR parse out the file size or file time, usually a result of sending SIZE/MDTM commands
else if (status == FtpStatusCode.FileStatus)
{
FtpWebRequest request = (FtpWebRequest)_request;
if (entry.Command.StartsWith("SIZE "))
{
_contentLength = GetContentLengthFrom213Response(response.StatusDescription);
}
else if (entry.Command.StartsWith("MDTM "))
{
_lastModified = GetLastModifiedFrom213Response(response.StatusDescription);
}
}
// OR parse out our login directory
else if (status == FtpStatusCode.PathnameCreated)
{
if (entry.Command == "PWD\r\n" && !entry.HasFlag(PipelineEntryFlags.UserCommand))
{
_loginDirectory = GetLoginDirectory(response.StatusDescription);
}
}
// Asserting we have some positive response
else
{
// We only use CWD to reset ourselves back to the login directory.
if (entry.Command.IndexOf("CWD") != -1)
{
_establishedServerDirectory = _requestedServerDirectory;
}
}
// Intermediate responses require rereading
if (response.PositiveIntermediate || (!UsingSecureStream && entry.Command == "AUTH TLS\r\n"))
{
return PipelineInstruction.Reread;
}
return PipelineInstruction.Advance;
}
internal static RemoteCertValidationCallback CreateAdapter(ServicePoint serviePoint, TlsStream secureStream, object request)
{
ServicePoint.HandshakeDoneProcedure procedure = new ServicePoint.HandshakeDoneProcedure(serviePoint, secureStream, request);
return new RemoteCertValidationCallback(procedure.CertValidationCallback);
}
internal static RemoteCertValidationCallback CreateAdapter(ServicePoint serviePoint, TlsStream secureStream, object request)
{
ServicePoint.HandshakeDoneProcedure procedure = new ServicePoint.HandshakeDoneProcedure(serviePoint, secureStream, request);
return(new RemoteCertValidationCallback(procedure.CertValidationCallback));
}
// Creates a FtpDataStream object, constructs a TLS stream if needed.
// In case SSL and ASYNC we delay sigaling the user stream until the handshake is done.
private PipelineInstruction QueueOrCreateFtpDataStream(ref Stream stream)
{
if (_dataSocket == null)
throw new InternalException();
//
// Re-entered pipeline with completed read on the TlsStream
//
if (_tlsStream != null)
{
stream = new FtpDataStream(_tlsStream, (FtpWebRequest)_request, IsFtpDataStreamWriteable());
_tlsStream = null;
return PipelineInstruction.GiveStream;
}
NetworkStream networkStream = new NetworkStream(_dataSocket, true);
if (UsingSecureStream)
{
FtpWebRequest request = (FtpWebRequest)_request;
TlsStream tlsStream = new TlsStream(networkStream, _dataSocket, request.RequestUri.Host, request.ClientCertificates);
networkStream = tlsStream;
if (_isAsync)
{
_tlsStream = tlsStream;
tlsStream.BeginAuthenticateAsClient(s_SSLHandshakeCallback, this);
return PipelineInstruction.Pause;
}
else
{
tlsStream.AuthenticateAsClient();
}
}
stream = new FtpDataStream(networkStream, (FtpWebRequest)_request, IsFtpDataStreamWriteable());
return PipelineInstruction.GiveStream;
}
static void SendStartTlsCallback(IAsyncResult result) //7
{
if (!result.CompletedSynchronously)
{
ConnectAndHandshakeAsyncResult thisPtr = (ConnectAndHandshakeAsyncResult)result.AsyncState;
try
{
StartTlsCommand.EndSend(result);
TlsStream TlsStream = new TlsStream(thisPtr.connection.pooledStream.ServicePoint.Host, thisPtr.connection.pooledStream.NetworkStream, thisPtr.connection.ClientCertificates, thisPtr.connection.pooledStream.ServicePoint, thisPtr.connection.client, thisPtr.m_OuterResult.ContextCopy);
thisPtr.connection.pooledStream.NetworkStream = TlsStream;
thisPtr.connection.responseReader = new SmtpReplyReaderFactory(thisPtr.connection.pooledStream.NetworkStream);
thisPtr.SendEHello();
}
catch (Exception e)
{
thisPtr.InvokeCallback(e);
}
}
}
private HandshakeDoneProcedure(ServicePoint serviePoint, TlsStream secureStream, object request)
{
this.m_ServicePoint = serviePoint;
this.m_SecureStream = secureStream;
this.m_Request = request;
}
bool SendStartTls()//6
{
IAsyncResult result = StartTlsCommand.BeginSend(connection, SendStartTlsCallback, this);
if (result.CompletedSynchronously)
{
StartTlsCommand.EndSend(result);
TlsStream TlsStream = new TlsStream(connection.pooledStream.ServicePoint.Host, connection.pooledStream.NetworkStream, connection.ClientCertificates, connection.pooledStream.ServicePoint, connection.client, m_OuterResult.ContextCopy);
connection.pooledStream.NetworkStream = TlsStream;
connection.responseReader = new SmtpReplyReaderFactory(connection.pooledStream.NetworkStream);
SendEHello();
return true;
}
return false;
}
internal void GetConnection(ServicePoint servicePoint)
{
if (isConnected)
{
throw new InvalidOperationException(SR.GetString(SR.SmtpAlreadyConnected));
}
if (Logging.On) Logging.Associate(Logging.Web, this, servicePoint);
Debug.Assert(servicePoint != null, "servicePoint was null from SmtpTransport");
connectionPool = ConnectionPoolManager.GetConnectionPool(servicePoint, "", m_CreateConnectionCallback);
PooledStream pooledStream = connectionPool.GetConnection((object)this, null, Timeout);
while (((SmtpPooledStream)pooledStream).creds != null && ((SmtpPooledStream)pooledStream).creds != credentials) {
// destroy this connection so that a new connection can be created
// in order to use the proper credentials. Do not just close the
// connection since it's in a state where a QUIT could be sent
connectionPool.PutConnection(pooledStream, pooledStream.Owner, Timeout, false);
pooledStream = connectionPool.GetConnection((object)this, null, Timeout);
}
if (Logging.On) Logging.Associate(Logging.Web, this, pooledStream);
lock (this) {
this.pooledStream = pooledStream;
}
((SmtpPooledStream)pooledStream).creds = credentials;
responseReader = new SmtpReplyReaderFactory(pooledStream.NetworkStream);
//set connectionlease
pooledStream.UpdateLifetime();
//if the stream was already used, then we've already done the handshake
if (((SmtpPooledStream)pooledStream).previouslyUsed == true) {
isConnected = true;
return;
}
LineInfo info = responseReader.GetNextReplyReader().ReadLine();
switch (info.StatusCode)
{
case SmtpStatusCode.ServiceReady:
{
break;
}
default:
{
throw new SmtpException(info.StatusCode, info.Line, true);
}
}
try
{
extensions = EHelloCommand.Send(this, client.clientDomain);
ParseExtensions(extensions);
}
catch (SmtpException e)
{
if ((e.StatusCode != SmtpStatusCode.CommandUnrecognized)
&& (e.StatusCode != SmtpStatusCode.CommandNotImplemented)) {
throw e;
}
HelloCommand.Send(this, client.clientDomain);
//if ehello isn't supported, assume basic login
supportedAuth = SupportedAuth.Login;
}
#if !FEATURE_PAL
// Establish TLS
if (enableSsl)
{
if (!serverSupportsStartTls)
{
// Either TLS is already established or server does not support TLS
if (!(pooledStream.NetworkStream is TlsStream))
{
throw new SmtpException(SR.GetString(SR.MailServerDoesNotSupportStartTls));
}
}
StartTlsCommand.Send(this);
TlsStream TlsStream = new TlsStream(servicePoint.Host, pooledStream.NetworkStream, clientCertificates, servicePoint, client, null);
pooledStream.NetworkStream = TlsStream;
//for SMTP, the CBT should be unique
this.channelBindingToken = TlsStream.GetChannelBinding(ChannelBindingKind.Unique);
responseReader = new SmtpReplyReaderFactory(pooledStream.NetworkStream);
// According to RFC 3207: The client SHOULD send an EHLO command
// as the first command after a successful TLS negotiation.
extensions = EHelloCommand.Send(this, client.clientDomain);
ParseExtensions(extensions);
}
#endif // !FEATURE_PAL
//if no credentials were supplied, try anonymous
//servers don't appear to anounce that they support anonymous login.
if (credentials != null) {
for (int i = 0; i < authenticationModules.Length; i++)
{
//only authenticate if the auth protocol is supported - [....]
if (!AuthSupported(authenticationModules[i])) {
continue;
}
NetworkCredential credential = credentials.GetCredential(servicePoint.Host,
servicePoint.Port, authenticationModules[i].AuthenticationType);
if (credential == null)
continue;
Authorization auth = SetContextAndTryAuthenticate(authenticationModules[i], credential, null);
if (auth != null && auth.Message != null)
{
info = AuthCommand.Send(this, authenticationModules[i].AuthenticationType, auth.Message);
if (info.StatusCode == SmtpStatusCode.CommandParameterNotImplemented)
{
continue;
}
while ((int)info.StatusCode == 334)
{
auth = authenticationModules[i].Authenticate(info.Line, null, this, this.client.TargetName, this.channelBindingToken);
if (auth == null)
{
throw new SmtpException(SR.GetString(SR.SmtpAuthenticationFailed));
}
info = AuthCommand.Send(this, auth.Message);
if ((int)info.StatusCode == 235)
{
authenticationModules[i].CloseContext(this);
isConnected = true;
return;
}
}
}
}
}
isConnected = true;
}
//
// This is called by underlying base class code, each time a new response is received from the wire or a protocol stage is resumed.
// This function controls the seting up of a data socket/connection, and of saving off the server responses
//
protected override PipelineInstruction PipelineCallback(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
GlobalLog.Print("FtpControlStream#" + ValidationHelper.HashString(this) + ">" + (entry == null? "null" : entry.Command));
GlobalLog.Print("FtpControlStream#" + ValidationHelper.HashString(this) + ">" + ((response == null) ? "null" : response.StatusDescription));
// null response is not expected
if (response == null)
return PipelineInstruction.Abort;
FtpStatusCode status = (FtpStatusCode) response.Status;
//
// Update global "current status" for FtpWebRequest
//
if (status != FtpStatusCode.ClosingControl)
{
// A 221 status won't be reflected on the user FTP response
// Anything else will (by design?)
StatusCode = status;
StatusLine = response.StatusDescription;
}
// If the status code is outside the range defined in RFC (1xx to 5xx) throw
if (response.InvalidStatusCode)
throw new WebException(SR.GetString(SR.net_InvalidStatusCode), WebExceptionStatus.ProtocolError);
// Update the banner message if any, this is a little hack because the "entry" param is null
if (m_Index == -1) {
if (status == FtpStatusCode.SendUserCommand)
{
m_BannerMessage = new StringBuilder();
m_BannerMessage.Append(StatusLine);
return PipelineInstruction.Advance;
}
else if (status == FtpStatusCode.ServiceTemporarilyNotAvailable)
{
return PipelineInstruction.Reread;
}
else
throw GenerateException(status,response.StatusDescription, null);
}
//
// Check for the result of our attempt to use UTF8
// Condsider: optimize this for speed (avoid string compare) as that is the only command that may fail
//
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion) {
Encoding = Encoding.UTF8;
} else {
Encoding = Encoding.Default;
}
return PipelineInstruction.Advance;
}
// If we are already logged in and the server returns 530 then
// the server does not support re-issuing a USER command,
// tear down the connection and start all over again
if (entry.Command.IndexOf("USER") != -1)
{
// The server may not require a password for this user, so bypass the password command
if (status == FtpStatusCode.LoggedInProceed)
{
m_LoginState = FtpLoginState.LoggedIn;
m_Index++;
}
// The server does not like re-login
// (We are logged in already but want to re-login under a different user)
else if (status == FtpStatusCode.NotLoggedIn &&
m_LoginState != FtpLoginState.NotLoggedIn)
{
m_LoginState = FtpLoginState.ReloginFailed;
throw ExceptionHelper.IsolatedException;
}
}
//
// Throw on an error with possible recovery option
//
if (response.TransientFailure || response.PermanentFailure) {
if (status == FtpStatusCode.ServiceNotAvailable) {
MarkAsRecoverableFailure();
}
throw GenerateException(status,response.StatusDescription, null);
}
if (m_LoginState != FtpLoginState.LoggedIn
&& entry.Command.IndexOf("PASS") != -1)
{
// Note the fact that we logged in
if (status == FtpStatusCode.NeedLoginAccount || status == FtpStatusCode.LoggedInProceed)
m_LoginState = FtpLoginState.LoggedIn;
else
throw GenerateException(status,response.StatusDescription, null);
}
//
// Parse special cases
//
if (entry.HasFlag(PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool isSocketReady;
PipelineInstruction result = QueueOrCreateDataConection(entry, response, timeout, ref stream, out isSocketReady);
if (!isSocketReady)
return result;
// otheriwse we have a stream to create
}
//
// This is part of the above case and it's all about giving data stream back
//
if (status == FtpStatusCode.OpeningData || status == FtpStatusCode.DataAlreadyOpen)
{
if (m_DataSocket == null)
{
// a better diagnostic?
return PipelineInstruction.Abort;
}
if (!entry.HasFlag(PipelineEntryFlags.GiveDataStream))
{
m_AbortReason = SR.GetString(SR.net_ftp_invalid_status_response, status, entry.Command);
return PipelineInstruction.Abort;
}
// Parse out the Content length, if we can
TryUpdateContentLength(response.StatusDescription);
// Parse out the file name, when it is returned and use it for our ResponseUri
FtpWebRequest request = (FtpWebRequest) m_Request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
TryUpdateResponseUri(response.StatusDescription, request);
}
return QueueOrCreateFtpDataStream(ref stream);
}
//
// Parse responses by status code exclusivelly
//
//Update welcome message
if (status == FtpStatusCode.LoggedInProceed)
{
m_WelcomeMessage.Append(StatusLine);
}
// OR set the user response ExitMessage
else if (status == FtpStatusCode.ClosingControl)
{
m_ExitMessage.Append(response.StatusDescription);
// And close the control stream socket on "QUIT"
CloseSocket();
}
#if !FEATURE_PAL
// OR set us up for SSL/TLS, after this we'll be writing securely
else if (status == FtpStatusCode.ServerWantsSecureSession)
{
FtpWebRequest request = (FtpWebRequest) m_Request;
TlsStream tlsStream = new TlsStream(request.RequestUri.Host, NetworkStream, request.ClientCertificates, Pool.ServicePoint, request, m_Async ? request.GetWritingContext().ContextCopy : null);
NetworkStream = tlsStream;
}
#endif // !FEATURE_PAL
// OR parse out the file size or file time, usually a result of sending SIZE/MDTM commands
else if (status == FtpStatusCode.FileStatus)
{
FtpWebRequest request = (FtpWebRequest) m_Request;
if (entry.Command.StartsWith("SIZE ")) {
m_ContentLength = GetContentLengthFrom213Response(response.StatusDescription);
} else if (entry.Command.StartsWith("MDTM ")) {
m_LastModified = GetLastModifiedFrom213Response(response.StatusDescription);
}
}
// OR parse out our login directory
else if (status == FtpStatusCode.PathnameCreated)
{
if (entry.Command == "PWD\r\n" && !entry.HasFlag(PipelineEntryFlags.UserCommand))
{
m_LoginDirectory = GetLoginDirectory(response.StatusDescription);
}
}
// Asserting we have some positive response
else
{
// We only use CWD to reset ourselves back to the login directory.
if (entry.Command.IndexOf("CWD") != -1)
{
m_EstablishedServerDirectory = m_RequestedServerDirectory;
}
}
// Intermediate responses require rereading
if (response.PositiveIntermediate || (!UsingSecureStream && entry.Command == "AUTH TLS\r\n"))
{
return PipelineInstruction.Reread;
}
return PipelineInstruction.Advance;
}
protected override CommandStream.PipelineInstruction PipelineCallback(CommandStream.PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
if (response == null)
{
return CommandStream.PipelineInstruction.Abort;
}
FtpStatusCode status = (FtpStatusCode) response.Status;
if (status != FtpStatusCode.ClosingControl)
{
this.StatusCode = status;
this.StatusLine = response.StatusDescription;
}
if (response.InvalidStatusCode)
{
throw new WebException(SR.GetString("net_InvalidStatusCode"), WebExceptionStatus.ProtocolError);
}
if (base.m_Index == -1)
{
switch (status)
{
case FtpStatusCode.SendUserCommand:
this.m_BannerMessage = new StringBuilder();
this.m_BannerMessage.Append(this.StatusLine);
return CommandStream.PipelineInstruction.Advance;
case FtpStatusCode.ServiceTemporarilyNotAvailable:
return CommandStream.PipelineInstruction.Reread;
}
throw base.GenerateException(status, response.StatusDescription, null);
}
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion)
{
base.Encoding = Encoding.UTF8;
}
else
{
base.Encoding = Encoding.Default;
}
return CommandStream.PipelineInstruction.Advance;
}
if (entry.Command.IndexOf("USER") != -1)
{
if (status == FtpStatusCode.LoggedInProceed)
{
this.m_LoginState = FtpLoginState.LoggedIn;
base.m_Index++;
}
else if ((status == FtpStatusCode.NotLoggedIn) && (this.m_LoginState != FtpLoginState.NotLoggedIn))
{
this.m_LoginState = FtpLoginState.ReloginFailed;
throw ExceptionHelper.IsolatedException;
}
}
if (response.TransientFailure || response.PermanentFailure)
{
if (status == FtpStatusCode.ServiceNotAvailable)
{
base.MarkAsRecoverableFailure();
}
throw base.GenerateException(status, response.StatusDescription, null);
}
if ((this.m_LoginState != FtpLoginState.LoggedIn) && (entry.Command.IndexOf("PASS") != -1))
{
switch (status)
{
case FtpStatusCode.NeedLoginAccount:
case FtpStatusCode.LoggedInProceed:
this.m_LoginState = FtpLoginState.LoggedIn;
goto Label_017A;
}
throw base.GenerateException(status, response.StatusDescription, null);
}
Label_017A:
if (entry.HasFlag(CommandStream.PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool flag;
CommandStream.PipelineInstruction instruction = this.QueueOrCreateDataConection(entry, response, timeout, ref stream, out flag);
if (!flag)
{
return instruction;
}
}
switch (status)
{
case FtpStatusCode.OpeningData:
case FtpStatusCode.DataAlreadyOpen:
{
if (this.m_DataSocket == null)
{
return CommandStream.PipelineInstruction.Abort;
}
if (!entry.HasFlag(CommandStream.PipelineEntryFlags.GiveDataStream))
{
base.m_AbortReason = SR.GetString("net_ftp_invalid_status_response", new object[] { status, entry.Command });
return CommandStream.PipelineInstruction.Abort;
}
this.TryUpdateContentLength(response.StatusDescription);
FtpWebRequest request = (FtpWebRequest) base.m_Request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
this.TryUpdateResponseUri(response.StatusDescription, request);
}
return this.QueueOrCreateFtpDataStream(ref stream);
}
case FtpStatusCode.LoggedInProceed:
this.m_WelcomeMessage.Append(this.StatusLine);
break;
case FtpStatusCode.ClosingControl:
this.m_ExitMessage.Append(response.StatusDescription);
base.CloseSocket();
break;
case FtpStatusCode.ServerWantsSecureSession:
{
FtpWebRequest initiatingRequest = (FtpWebRequest) base.m_Request;
TlsStream stream2 = new TlsStream(initiatingRequest.RequestUri.Host, base.NetworkStream, initiatingRequest.ClientCertificates, base.Pool.ServicePoint, initiatingRequest, base.m_Async ? initiatingRequest.GetWritingContext().ContextCopy : null);
base.NetworkStream = stream2;
break;
}
case FtpStatusCode.FileStatus:
{
FtpWebRequest request1 = (FtpWebRequest) base.m_Request;
if (entry.Command.StartsWith("SIZE "))
{
this.m_ContentLength = this.GetContentLengthFrom213Response(response.StatusDescription);
}
else if (entry.Command.StartsWith("MDTM "))
{
this.m_LastModified = this.GetLastModifiedFrom213Response(response.StatusDescription);
}
break;
}
default:
if (status == FtpStatusCode.PathnameCreated)
{
if ((entry.Command == "PWD\r\n") && !entry.HasFlag(CommandStream.PipelineEntryFlags.UserCommand))
{
this.m_LoginDirectory = this.GetLoginDirectory(response.StatusDescription);
}
}
else if (entry.Command.IndexOf("CWD") != -1)
{
this.m_EstablishedServerDirectory = this.m_RequestedServerDirectory;
}
break;
}
if (!response.PositiveIntermediate && (base.UsingSecureStream || !(entry.Command == "AUTH TLS\r\n")))
{
return CommandStream.PipelineInstruction.Advance;
}
return CommandStream.PipelineInstruction.Reread;
}
internal RemoteCertValidationCallback SetupHandshakeDoneProcedure(TlsStream secureStream, object request)
{
return(HandshakeDoneProcedure.CreateAdapter(this, secureStream, request));
}
private void CompleteConnection(bool async, HttpWebRequest request)
{
GlobalLog.Enter("Connection#" + ValidationHelper.HashString(this) + "::CompleteConnection", "async:" + async.ToString() + " request:" + ValidationHelper.HashString(request));
GlobalLog.ThreadContract(ThreadKinds.Unknown, "Connection#" + ValidationHelper.HashString(this) + "::CompleteConnection");
WebExceptionStatus ws = WebExceptionStatus.ConnectFailure;
//
// From now on the request.SetRequestSubmitDone must be called or it may hang
// For a [....] request the write side reponse windowwas opened in HttpWebRequest.SubmitRequest
if (request.Async)
request.OpenWriteSideResponseWindow();
try
{
try {
#if !FEATURE_PAL
if (request.Address.Scheme == Uri.UriSchemeHttps) {
TlsStream tlsStream = new TlsStream(request.GetRemoteResourceUri().IdnHost,
NetworkStream, request.ClientCertificates, ServicePoint, request,
request.Async ? request.GetConnectingContext().ContextCopy : null);
NetworkStream = tlsStream;
}
#endif
ws = WebExceptionStatus.Success;
}
catch {
// The TLS stream could not be created. Close the current non-TLS stream immediately
// to prevent any future use of it. Due to race conditions, the error handling will sometimes
// try to write (flush) out some of the HTTP headers to the stream as it is closing down the failed
// HttpWebRequest. This would cause plain text to go on the wire even though the stream should
// have been TLS encrypted.
NetworkStream.Close();
throw;
}
finally {
//
// There is a ---- with Abort so TlsStream ctor may throw.
// SetRequestSubmitDone will deal with this kind of errors.
//
m_ReadState = ReadState.Start;
ClearReaderState();
request.SetRequestSubmitDone(new ConnectStream(this, request));
}
}
catch (Exception exception)
{
if (m_InnerException == null)
m_InnerException = exception;
WebException webException = exception as WebException;
if (webException != null)
{
ws = webException.Status;
}
}
if (ws != WebExceptionStatus.Success)
{
ConnectionReturnResult returnResult = null;
HandleError(false, false, ws, ref returnResult);
ConnectionReturnResult.SetResponses(returnResult);
if (Logging.On) Logging.PrintError(Logging.Web, this, "CompleteConnection", "on error");
GlobalLog.Leave("Connection#" + ValidationHelper.HashString(this) + "::CompleteConnection", "on error");
}
else
{
GlobalLog.Leave("Connection#" + ValidationHelper.HashString(this) + "::CompleteConnection");
}
}
private void CompleteConnection(bool async, HttpWebRequest request)
{
WebExceptionStatus connectFailure = WebExceptionStatus.ConnectFailure;
if (request.Async)
{
request.OpenWriteSideResponseWindow();
}
try
{
try
{
if (request.Address.Scheme == Uri.UriSchemeHttps)
{
TlsStream stream = new TlsStream(request.GetRemoteResourceUri().Host, base.NetworkStream, request.ClientCertificates, this.ServicePoint, request, request.Async ? request.GetConnectingContext().ContextCopy : null);
base.NetworkStream = stream;
}
}
finally
{
this.m_ReadState = ReadState.Start;
this.ClearReaderState();
request.SetRequestSubmitDone(new ConnectStream(this, request));
connectFailure = WebExceptionStatus.Success;
}
}
catch (Exception exception)
{
if (this.m_InnerException == null)
{
this.m_InnerException = exception;
}
WebException exception2 = exception as WebException;
if (exception2 != null)
{
connectFailure = exception2.Status;
}
}
if (connectFailure != WebExceptionStatus.Success)
{
ConnectionReturnResult returnResult = null;
this.HandleError(false, false, connectFailure, ref returnResult);
ConnectionReturnResult.SetResponses(returnResult);
}
}
protected override void ClearState()
{
_contentLength = -1;
_lastModified = DateTime.MinValue;
_responseUri = null;
_dataHandshakeStarted = false;
StatusCode = FtpStatusCode.Undefined;
StatusLine = null;
_dataSocket = null;
_passiveEndPoint = null;
_tlsStream = null;
base.ClearState();
}
protected override void ProcessAsTls1()
{
ProcessAsSsl3 ();
// If applicable add the "server_name" extension to the hello message
// http://www.ietf.org/rfc/rfc3546.txt
string host = Context.ClientSettings.TargetHost;
// Our TargetHost might be an address (not a host *name*) - see bug #8553
// RFC3546 -> Literal IPv4 and IPv6 addresses are not permitted in "HostName".
IPAddress addr;
if (IPAddress.TryParse (host, out addr))
return;
TlsStream extensions = new TlsStream ();
byte[] server_name = System.Text.Encoding.UTF8.GetBytes (host);
extensions.Write ((short) 0x0000); // ExtensionType: server_name (0)
extensions.Write ((short) (server_name.Length + 5)); // ServerNameList (length)
extensions.Write ((short) (server_name.Length + 3)); // ServerName (length)
extensions.Write ((byte) 0x00); // NameType: host_name (0)
extensions.Write ((short) server_name.Length); // HostName (length)
extensions.Write (server_name); // HostName (UTF8)
this.Write ((short) extensions.Length);
this.Write (extensions.ToArray ());
}
private HandshakeDoneProcedure(ServicePoint serviePoint, TlsStream secureStream, object request)
{
this.m_ServicePoint = serviePoint;
this.m_SecureStream = secureStream;
this.m_Request = request;
}
private static void SendStartTlsCallback(IAsyncResult result)
{
if (!result.CompletedSynchronously)
{
SmtpConnection.ConnectAndHandshakeAsyncResult asyncState = (SmtpConnection.ConnectAndHandshakeAsyncResult) result.AsyncState;
try
{
StartTlsCommand.EndSend(result);
TlsStream stream = new TlsStream(asyncState.connection.pooledStream.ServicePoint.Host, asyncState.connection.pooledStream.NetworkStream, asyncState.connection.ClientCertificates, asyncState.connection.pooledStream.ServicePoint, asyncState.connection.client, asyncState.m_OuterResult.ContextCopy);
asyncState.connection.pooledStream.NetworkStream = stream;
asyncState.connection.responseReader = new SmtpReplyReaderFactory(asyncState.connection.pooledStream.NetworkStream);
asyncState.SendEHello();
}
catch (Exception exception)
{
asyncState.InvokeCallback(exception);
}
}
}
internal RemoteCertValidationCallback SetupHandshakeDoneProcedure(TlsStream secureStream, object request)
{
return HandshakeDoneProcedure.CreateAdapter(this, secureStream, request);
}
internal RemoteCertValidationCallback SetupHandshakeDoneProcedure(TlsStream secureStream, Object request) {
// Use a private adapter to connect tlsstream and this service point
return HandshakeDoneProcedure.CreateAdapter(this, secureStream, request);
}
internal void GetConnection(ServicePoint servicePoint)
{
if (this.isConnected)
{
throw new InvalidOperationException(SR.GetString("SmtpAlreadyConnected"));
}
if (Logging.On)
{
Logging.Associate(Logging.Web, this, servicePoint);
}
this.connectionPool = ConnectionPoolManager.GetConnectionPool(servicePoint, "", m_CreateConnectionCallback);
PooledStream pooledStream = this.connectionPool.GetConnection(this, null, this.Timeout);
while ((((SmtpPooledStream) pooledStream).creds != null) && (((SmtpPooledStream) pooledStream).creds != this.credentials))
{
this.connectionPool.PutConnection(pooledStream, pooledStream.Owner, this.Timeout, false);
pooledStream = this.connectionPool.GetConnection(this, null, this.Timeout);
}
if (Logging.On)
{
Logging.Associate(Logging.Web, this, pooledStream);
}
lock (this)
{
this.pooledStream = pooledStream;
}
((SmtpPooledStream) pooledStream).creds = this.credentials;
this.responseReader = new SmtpReplyReaderFactory(pooledStream.NetworkStream);
pooledStream.UpdateLifetime();
if (((SmtpPooledStream) pooledStream).previouslyUsed)
{
this.isConnected = true;
}
else
{
LineInfo info = this.responseReader.GetNextReplyReader().ReadLine();
if (info.StatusCode != SmtpStatusCode.ServiceReady)
{
throw new SmtpException(info.StatusCode, info.Line, true);
}
try
{
this.extensions = EHelloCommand.Send(this, this.client.clientDomain);
this.ParseExtensions(this.extensions);
}
catch (SmtpException exception)
{
if ((exception.StatusCode != SmtpStatusCode.CommandUnrecognized) && (exception.StatusCode != SmtpStatusCode.CommandNotImplemented))
{
throw exception;
}
HelloCommand.Send(this, this.client.clientDomain);
this.supportedAuth = SupportedAuth.Login;
}
if (this.enableSsl)
{
if (!this.serverSupportsStartTls && !(pooledStream.NetworkStream is TlsStream))
{
throw new SmtpException(SR.GetString("MailServerDoesNotSupportStartTls"));
}
StartTlsCommand.Send(this);
TlsStream stream2 = new TlsStream(servicePoint.Host, pooledStream.NetworkStream, this.clientCertificates, servicePoint, this.client, null);
pooledStream.NetworkStream = stream2;
this.channelBindingToken = stream2.GetChannelBinding(ChannelBindingKind.Unique);
this.responseReader = new SmtpReplyReaderFactory(pooledStream.NetworkStream);
this.extensions = EHelloCommand.Send(this, this.client.clientDomain);
this.ParseExtensions(this.extensions);
}
if (this.credentials != null)
{
for (int i = 0; i < this.authenticationModules.Length; i++)
{
Authorization authorization;
if (this.AuthSupported(this.authenticationModules[i]))
{
NetworkCredential credential = this.credentials.GetCredential(servicePoint.Host, servicePoint.Port, this.authenticationModules[i].AuthenticationType);
if (credential != null)
{
authorization = this.SetContextAndTryAuthenticate(this.authenticationModules[i], credential, null);
if ((authorization != null) && (authorization.Message != null))
{
info = AuthCommand.Send(this, this.authenticationModules[i].AuthenticationType, authorization.Message);
if (info.StatusCode != SmtpStatusCode.CommandParameterNotImplemented)
{
goto Label_0363;
}
}
}
}
continue;
Label_02F2:
authorization = this.authenticationModules[i].Authenticate(info.Line, null, this, this.client.TargetName, this.channelBindingToken);
if (authorization == null)
{
throw new SmtpException(SR.GetString("SmtpAuthenticationFailed"));
}
info = AuthCommand.Send(this, authorization.Message);
if (info.StatusCode == ((SmtpStatusCode) 0xeb))
{
this.authenticationModules[i].CloseContext(this);
this.isConnected = true;
return;
}
Label_0363:
if (info.StatusCode == ((SmtpStatusCode) 0x14e))
{
goto Label_02F2;
}
}
}
this.isConnected = true;
}
}
// Creates a FtpDataStream object, constructs a TLS stream if needed.
// In case SSL we issue a 0 bytes read on that stream to force handshake.
// In case SSL and ASYNC we delay sigaling the user stream until the handshake is done.
//
private PipelineInstruction QueueOrCreateFtpDataStream(ref Stream stream)
{
if (m_DataSocket == null)
throw new InternalException();
//
// Re-entered pipeline with completed read on the TlsStream
//
if (this.m_TlsStream != null )
{
stream = new FtpDataStream(this.m_TlsStream, (FtpWebRequest) m_Request, IsFtpDataStreamWriteable());
this.m_TlsStream = null;
return PipelineInstruction.GiveStream;
}
NetworkStream networkStream = new NetworkStream(m_DataSocket, true);
#if !FEATURE_PAL
if (UsingSecureStream)
{
FtpWebRequest request = (FtpWebRequest) m_Request;
TlsStream tlsStream = new TlsStream(request.RequestUri.Host, networkStream, request.ClientCertificates, Pool.ServicePoint, request, m_Async ? request.GetWritingContext().ContextCopy : null);
networkStream = tlsStream;
if (m_Async)
{
this.m_TlsStream = tlsStream;
LazyAsyncResult handshakeResult = new LazyAsyncResult(null, this, m_SSLHandshakeCallback);
tlsStream.ProcessAuthentication(handshakeResult);
return PipelineInstruction.Pause;
}
else
{
tlsStream.ProcessAuthentication(null);
}
}
#endif // !FEATURE_PAL
stream = new FtpDataStream(networkStream, (FtpWebRequest) m_Request, IsFtpDataStreamWriteable());
return PipelineInstruction.GiveStream;
}
// This is called by underlying base class code, each time a new response is received from the wire or a protocol stage is resumed.
// This function controls the setting up of a data socket/connection, and of saving off the server responses.
protected override PipelineInstruction PipelineCallback(PipelineEntry entry, ResponseDescription response, bool timeout, ref Stream stream)
{
if (NetEventSource.IsEnabled)
{
NetEventSource.Info(this, $"Command:{entry?.Command} Description:{response?.StatusDescription}");
}
// null response is not expected
if (response == null)
{
return(PipelineInstruction.Abort);
}
FtpStatusCode status = (FtpStatusCode)response.Status;
//
// Update global "current status" for FtpWebRequest
//
if (status != FtpStatusCode.ClosingControl)
{
// A 221 status won't be reflected on the user FTP response
// Anything else will (by design?)
StatusCode = status;
StatusLine = response.StatusDescription;
}
// If the status code is outside the range defined in RFC (1xx to 5xx) throw
if (response.InvalidStatusCode)
{
throw new WebException(SR.net_InvalidStatusCode, WebExceptionStatus.ProtocolError);
}
// Update the banner message if any, this is a little hack because the "entry" param is null
if (_index == -1)
{
if (status == FtpStatusCode.SendUserCommand)
{
_bannerMessage = new StringBuilder();
_bannerMessage.Append(StatusLine);
return(PipelineInstruction.Advance);
}
else if (status == FtpStatusCode.ServiceTemporarilyNotAvailable)
{
return(PipelineInstruction.Reread);
}
else
{
throw GenerateException(status, response.StatusDescription, null);
}
}
//
// Check for the result of our attempt to use UTF8
//
if (entry.Command == "OPTS utf8 on\r\n")
{
if (response.PositiveCompletion)
{
Encoding = Encoding.UTF8;
}
else
{
Encoding = Encoding.Default;
}
return(PipelineInstruction.Advance);
}
// If we are already logged in and the server returns 530 then
// the server does not support re-issuing a USER command,
// tear down the connection and start all over again
if (entry.Command.IndexOf("USER") != -1)
{
// The server may not require a password for this user, so bypass the password command
if (status == FtpStatusCode.LoggedInProceed)
{
_loginState = FtpLoginState.LoggedIn;
_index++;
}
}
//
// Throw on an error with possible recovery option
//
if (response.TransientFailure || response.PermanentFailure)
{
if (status == FtpStatusCode.ServiceNotAvailable)
{
MarkAsRecoverableFailure();
}
throw GenerateException(status, response.StatusDescription, null);
}
if (_loginState != FtpLoginState.LoggedIn &&
entry.Command.IndexOf("PASS") != -1)
{
// Note the fact that we logged in
if (status == FtpStatusCode.NeedLoginAccount || status == FtpStatusCode.LoggedInProceed)
{
_loginState = FtpLoginState.LoggedIn;
}
else
{
throw GenerateException(status, response.StatusDescription, null);
}
}
//
// Parse special cases
//
if (entry.HasFlag(PipelineEntryFlags.CreateDataConnection) && (response.PositiveCompletion || response.PositiveIntermediate))
{
bool isSocketReady;
PipelineInstruction result = QueueOrCreateDataConection(entry, response, timeout, ref stream, out isSocketReady);
if (!isSocketReady)
{
return(result);
}
// otherwise we have a stream to create
}
//
// This is part of the above case and it's all about giving data stream back
//
if (status == FtpStatusCode.OpeningData || status == FtpStatusCode.DataAlreadyOpen)
{
if (_dataSocket == null)
{
return(PipelineInstruction.Abort);
}
if (!entry.HasFlag(PipelineEntryFlags.GiveDataStream))
{
_abortReason = SR.Format(SR.net_ftp_invalid_status_response, status, entry.Command);
return(PipelineInstruction.Abort);
}
// Parse out the Content length, if we can
TryUpdateContentLength(response.StatusDescription);
// Parse out the file name, when it is returned and use it for our ResponseUri
FtpWebRequest request = (FtpWebRequest)_request;
if (request.MethodInfo.ShouldParseForResponseUri)
{
TryUpdateResponseUri(response.StatusDescription, request);
}
return(QueueOrCreateFtpDataStream(ref stream));
}
//
// Parse responses by status code exclusivelly
//
// Update welcome message
if (status == FtpStatusCode.LoggedInProceed)
{
_welcomeMessage.Append(StatusLine);
}
// OR set the user response ExitMessage
else if (status == FtpStatusCode.ClosingControl)
{
_exitMessage.Append(response.StatusDescription);
// And close the control stream socket on "QUIT"
CloseSocket();
}
// OR set us up for SSL/TLS, after this we'll be writing securely
else if (status == FtpStatusCode.ServerWantsSecureSession)
{
// If NetworkStream is a TlsStream, then this must be in the async callback
// from completing the SSL handshake.
// So just let the pipeline continue.
if (!(NetworkStream is TlsStream))
{
FtpWebRequest request = (FtpWebRequest)_request;
TlsStream tlsStream = new TlsStream(NetworkStream, Socket, request.RequestUri.Host, request.ClientCertificates);
if (_isAsync)
{
tlsStream.BeginAuthenticateAsClient(ar =>
{
try
{
tlsStream.EndAuthenticateAsClient(ar);
NetworkStream = tlsStream;
this.ContinueCommandPipeline();
}
catch (Exception e)
{
this.CloseSocket();
this.InvokeRequestCallback(e);
}
}, null);
return(PipelineInstruction.Pause);
}
else
{
tlsStream.AuthenticateAsClient();
NetworkStream = tlsStream;
}
}
}
// OR parse out the file size or file time, usually a result of sending SIZE/MDTM commands
else if (status == FtpStatusCode.FileStatus)
{
FtpWebRequest request = (FtpWebRequest)_request;
if (entry.Command.StartsWith("SIZE "))
{
_contentLength = GetContentLengthFrom213Response(response.StatusDescription);
}
else if (entry.Command.StartsWith("MDTM "))
{
_lastModified = GetLastModifiedFrom213Response(response.StatusDescription);
}
}
// OR parse out our login directory
else if (status == FtpStatusCode.PathnameCreated)
{
if (entry.Command == "PWD\r\n" && !entry.HasFlag(PipelineEntryFlags.UserCommand))
{
_loginDirectory = GetLoginDirectory(response.StatusDescription);
}
}
// Asserting we have some positive response
else
{
// We only use CWD to reset ourselves back to the login directory.
if (entry.Command.IndexOf("CWD") != -1)
{
_establishedServerDirectory = _requestedServerDirectory;
}
}
// Intermediate responses require rereading
if (response.PositiveIntermediate || (!UsingSecureStream && entry.Command == "AUTH TLS\r\n"))
{
return(PipelineInstruction.Reread);
}
return(PipelineInstruction.Advance);
}
private bool SendStartTls()
{
IAsyncResult result = StartTlsCommand.BeginSend(this.connection, new AsyncCallback(SmtpConnection.ConnectAndHandshakeAsyncResult.SendStartTlsCallback), this);
if (result.CompletedSynchronously)
{
StartTlsCommand.EndSend(result);
TlsStream stream = new TlsStream(this.connection.pooledStream.ServicePoint.Host, this.connection.pooledStream.NetworkStream, this.connection.ClientCertificates, this.connection.pooledStream.ServicePoint, this.connection.client, this.m_OuterResult.ContextCopy);
this.connection.pooledStream.NetworkStream = stream;
this.connection.responseReader = new SmtpReplyReaderFactory(this.connection.pooledStream.NetworkStream);
this.SendEHello();
return true;
}
return false;
}
