/// <summary>
/// Metoda odpowiedzialna za obsluge przychodzacych wiadomosci
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void MsgService(object sender, MsgEvent e)
{
sb.Clear();
Decoder decoder = Encoding.UTF8.GetDecoder();
char[] chars = new char[decoder.GetCharCount(e.msg, 0, e.msg.Length)];
decoder.GetChars(e.msg, 0, e.msg.Length, chars, 0);
sb.Append(chars);
string message = sb.ToString();
sb.Clear();
if (String.Compare("ONLR", 0, message, 0, 4) == 0)
{
string onlinelist = message.Substring(4);
onlinelist = onlinelist.Replace(' ', '\n');
WriteInLog("Online:\n" + onlinelist);
return;
}
else if (String.Compare("ISOR", 0, message, 0, 4) == 0)
{
bool isOnline = false;
string msg = null;
if (String.Compare("True", 0, message, 4, 4) == 0)
{
isOnline = true;
}
if (!isOnline)
{
sb.Append("Connection attempt with: ").Append(loginToConnect).
Append(" failed, User is offline");
msg = sb.ToString();
WriteInLog(msg);
loginToConnect = null;
sb.Clear();
return;
}
else
{
sb.Append("Connection attempt with: ").Append(loginToConnect).
Append(" succeed");
msg = sb.ToString();
WriteInLog(msg);
sb.Append("Waiting for certificate from ").Append(loginToConnect);
msg = sb.ToString();
WriteInLog(msg);
sb.Clear();
byte[] msgOut = BindingModule.enc.GetBytes("GCR");
cm.Send(msgOut);
return;
}
}
else if (String.Compare("GCRA", 0, message, 0, 4) == 0)
{
byte[] data = e.msg;
byte[] certRawData = new byte[data.Length - 4];
Array.Copy(data, 4, certRawData, 0, certRawData.Length);
X509Certificate2 cert = CryptoModule.CreatePublicCertFromRawData(certRawData);
loginToConnect = CryptoModule.ImportKey(cert, false, false);
string msg;
sb.Clear();
sb.Append("Alice received certicate from ").Append(loginToConnect).
Append(". Starting chat now");
msg = sb.ToString();
WriteInLog(msg);
//Rozpoczecie dzialania chatu
isChatOpen = true;
EnableDisableControls(false);
this.MsgTextBox.Enabled = true;
this.SendBtn.Enabled = true;
this.DisconnectBtn.Enabled = true;
return;
}
else if (String.Compare("GCRB", 0, message, 0, 4) == 0)
{
byte[] data = e.msg;
byte[] certRawData = new byte[data.Length - 4];
Array.Copy(data, 4, certRawData, 0, certRawData.Length);
X509Certificate2 cert = CryptoModule.CreatePublicCertFromRawData(certRawData);
loginToConnect = CryptoModule.ImportKey(cert, false, false);
string msg;
sb.Clear();
sb.Append("Bob received certicate from ").Append(loginToConnect).
Append(".Connecting. Starting chat now");
msg = sb.ToString();
WriteInLog(msg);
//Rozpoczecie dzialania chatu
isChatOpen = true;
EnableDisableControls(false);
this.MsgTextBox.Enabled = true;
this.SendBtn.Enabled = true;
this.DisconnectBtn.Enabled = true;
return;
}
else if (String.Compare("DIC", 0, message, 0, 3) == 0)
{
//Disconnect
if (isChatOpen)
{
SendBtn.Enabled = false;
MsgTextBox.Enabled = false;
isChatOpen = false;
EnableDisableControls(true);
this.MsgTextBox.Enabled = false;
this.SendBtn.Enabled = false;
this.DisconnectBtn.Enabled = false;
CryptoModule.RemoveUserKey(loginToConnect);
loginToConnect = null;
WriteInLog("Disconnected. Chat terminated");
}
}
else if (String.Compare("MSG", 0, message, 0, 3) == 0)
{
WriteInLog("MSG recived");
byte[] encrypted = new byte[128];
byte[] signed = new byte[128];
Array.Copy(e.msg, 3, encrypted, 0, 128);
Array.Copy(e.msg, 131, signed, 0, 128);
byte[] decrypted = CryptoModule.DecryptMsg(encrypted);
if (CryptoModule.Verify(decrypted, signed, loginToConnect))
{
string msg = Encoding.UTF8.GetString(decrypted);
WriteInLogAsOtherUser(msg);
}
else
{
//Disconnect
SendBtn.Enabled = false;
MsgTextBox.Enabled = false;
isChatOpen = false;
EnableDisableControls(true);
this.MsgTextBox.Enabled = false;
this.SendBtn.Enabled = false;
this.DisconnectBtn.Enabled = false;
CryptoModule.RemoveUserKey(loginToConnect);
cm.Send(Encoding.UTF8.GetBytes("DIC"));
loginToConnect = null;
WriteInLog("Disconnected. Chat terminated");
}
}
}
/// <summary>
/// Metoda służąca do przeprowadzenia procedury logowania
/// </summary>
private void LoginMethod()
{
if (PwdTextBox.Text != "" && LoginTextBox.Text != "")
{
//Zebranie danych z pol okna logowania
string login = LoginTextBox.Text;
string pwd = PwdTextBox.Text;
//Zaszyfrowanie hasla i usuniecie z pamieci
byte[] pwdArray = BindingModule.enc.GetBytes(pwd);
StatusLabel.Text = "Login in progress";
pwd = "";
PwdTextBox.ResetText();
//Uruchomienie modulu komunkacji
if (!mw.cm.Run("localhost", "pkryserver.jumpingcrab.com"))
{
StatusLabel.Text = "Not able to tart comunnication module";
return;
}
//Wyslanie loginu i oczekiwanie na odp
int n = mw.cm.SendLogin(login);
//Reakcja na bledny login
if (n == 0)
{
StatusLabel.Text = "Signing in failed, wrong login";
mw.cm.Stop();
}
//Poprawny login hashowanie i wyslanie hasla
else
{
pwdArray = CryptoModule.HashNTimes(pwdArray, --n);
//send pwdArray
//Poczekaj na odpowiedz
// bool response = mw.cm.SendPwd(pwdArray);
if (mw.cm.SendPwd(pwdArray))
{
BindingModule.setLogin(login);
//Udane logowanie, czekam na certyfikat
StatusLabel.Text = "Waiting for certificate";
//Otrzymany certyfikat
byte[] certificateRawData = mw.cm.GetCertificate();
X509Certificate2 certificate = CryptoModule.CreatePrivateCertFromRawData(certificateRawData);
CryptoModule.ImportKey(certificate, true, false);
CryptoModule.ImportKey(certificate, true, true);
mw.EnableDisableControls(true);
mw.DisableLogBtn();
mw.WriteInLog("Logged in!");
mw.cm.Run();
this.Close();
}
else
{
StatusLabel.Text = "Signing in failed, wrong password";
}
}
}
else
{
StatusLabel.Text = "Need more data to proceed";
}
}