Deferred TLS/SSL handshakes on windows mobile

re: Deferred TLS/SSL handshakes on windows mobile

Fabin Labega — Fri, 09 Mar 2012 15:15:24 GMT

Thanks, Carlos! It works! I've done FTP Client with SslHelper. Like SMTP, FTP, at the beginning, ask for plain text, after set AUTH SSL, socket must be changed.

Resuming code:

private string remoteHost = "";

privete int remotePort = 21;

private string remoteUser = "";

private string remotePass = "";

private SslHelper sslHelper;

private Socket clientSocket;

int retValue=0;

private string reply = "";

(...)

private void button1_Click(object sender, EventArgs e)

{

remoteHost = "192.168.2.106";

//Start with Plain Text:

loginWithoutUser();

string cmd = "AUTH SSL";

sendCommand(cmd);

//change to ssl Socket

getSslStream();

//Login FTP Secure

remoteUser = "root";

remotePass = "1234";

ftp.close();

}

public void login()

{

try

{

if (clientSocket == null || clientSocket.Connected == false)

{

this.loginWithoutUser();

}

catch (Exception)

{

throw new IOException("Couldn't connect to remote server");

}

sendCommand("USER " + remoteUser);

if (!(retValue == 331 || retValue == 230))

{

throw new IOException(reply.Substring(4));

}

if (retValue != 230)

{

sendCommand("PASS " + remotePass);

if (!(retValue == 230 || retValue == 202))

{

throw new IOException(reply.Substring(4));

}

///

/// Login to the remote server.

///

public void loginWithoutUser()

{

clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

IPHostEntry IpToDomainName = Dns.GetHostEntry(remoteHost);

IPEndPoint ep = new IPEndPoint(IpToDomainName.AddressList[0], remotePort);

using (sslHelper = new SslHelper(clientSocket, IpToDomainName.HostName))

{

try

{

clientSocket.Connect(ep);

}

catch (Exception)

{

throw new IOException("Couldn't connect to remote server");

}

readReply();

if (retValue != 220)

{

close();

throw new IOException(reply.Substring(4));

}

public void getSslStream()

{

this.getSslStream(clientSocket);

}

public void getSslStream(Socket Csocket)

{

sslHelper.DoHandshake();

stream = new NetworkStream(Csocket);

}

public void sendCommand(String command)

{

clientSocket.Send(cmdBytes, cmdBytes.Length, 0);

readReply();

}

private void readReply()

{

reply = readLine();

retValue = Int32.Parse(reply.Substring(0, 3));

}

private string readLine()

{

string mes = "";

while (true)

{

bytes = clientSocket.Receive(buffer, buffer.Length, 0);

mes += ASCII.GetString(buffer, 0, bytes);

if (bytes < buffer.Length)

{

break;

}

char[] seperator = { '\n' };

string[] mess = mes.Split(seperator);

if (mes.Length > 2)

{

mes = mess[mess.Length - 2];

}

else

{

mes = mess[0];

}

if (!mes.Substring(3, 1).Equals(" "))

{

return readLine();

}

return mes;

}

re: Deferred TLS/SSL handshakes on windows mobile

Matthias Vance — Wed, 21 Apr 2010 12:29:38 GMT

Bindu,

Your code:

Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);

You should be using ProtocolType.TCP instead of ProtocolType.IP.

Kind regards,

Matthias Vance

re: Deferred TLS/SSL handshakes on windows mobile

Carlos [MSR] — Tue, 06 Oct 2009 19:57:19 GMT

Hello Bindu,

It is hard to say what could be going wrong. What does readReply do? Does the code hang in a particular line?

I have never tried an FTPS connection but reading a little bit about this protocol seems like there are two modes, implicit and explicit (search for FTPS on wikipedia). Which one are you trying to use?

Carlos

re: Deferred TLS/SSL handshakes on windows mobile

Bindu — Tue, 06 Oct 2009 12:34:01 GMT

Hi ,

Thanks for posting this code.

I am trying to establish FTP - SSL connection.

I am able to create a socket ,but when I am trying to create a data socket I am having problems.

Like after I create a datasocket , the ftp server just not respond or throw any exception.

I hope the problem lies some where in creating datasocket -

Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP);

IPEndPoint ep = new IPEndPoint(Dns.GetHostEntry(remoteHost).AddressList[0], port);

if (useSSL)

{

var sslHelp = new CommunicationsEngine.SSLHelper(s, remoteHost,false);

try

{

s.Connect(ep);

}

catch (Exception exp)

{

cleanup();

throw new IOException("Couldn't Connect SSL Data Socket " + exp.Message);

}

if (s.Connected)

{

readReply();

}

if (retValue != 220)

{

cleanup();

throw new IOException(reply.Substring(4));

}

can you please give me your comments?