public FtpTicketResponse RequstSessionKeyForFtpConnection(FtpKeyRequst ftpKeyRequst)
{
if (!users_list.ContainsKey(ftpKeyRequst.UserName))
{
return(null);
}
// get users from the data base
KdcFtpKey retKeyFromDB = m_FtpDBservice.getKdcFtpKey("KDC");
// check validity
if (retKeyFromDB == null)
{
Console.Write("no key exist in DB");
return(null);
}
// genrate new session key for CLIENT - FTP
byte[] sessiomKey = CAes.NewKey();
FtpTicketResponse ftpTicketResponse = new FtpTicketResponse();
ftpTicketResponse.SessionKeyClientFTPEncryptedForFTP = CAes.SimpleEncryptWithPassword(sessiomKey, retKeyFromDB.PassWord);
ftpTicketResponse.UserNameencryptedForFtpWithFtpKey = CAes.SimpleEncryptWithPassword(ftpKeyRequst.UserName, retKeyFromDB.PassWord);
ftpTicketResponse.SessionKeyClientFTPEncryptedForClient = CAes.SimpleEncrypt(sessiomKey, users_list[ftpKeyRequst.UserName].SessionKey, users_list[ftpKeyRequst.UserName].SessionKey);
return(ftpTicketResponse);
}
// requst to connect to Ftp service
private void getSessionKeyForFtpWorker_DoWork(object sender, DoWorkEventArgs e)
{
clientPrivateData clientData = ClientAllData.Instance.getMyClient();
//send requst for Auth
FtpKeyRequst ftpKeyRequst = new FtpKeyRequst(clientData.username);
FtpTicketResponse ftpTicketResponse = kdcProxy.RequstSessionKeyForFtpConnection(ftpKeyRequst); // blocking
if (ftpTicketResponse == null)
{
return;
}
byte[] sessionKey = CAes.SimpleDecrypt(ftpTicketResponse.SessionKeyClientFTPEncryptedForClient, clientData.m_kdcAsSessionKey, clientData.m_kdcAsSessionKey);
ClientAllData.Instance.getMyClient().m_ftpSessionKey = sessionKey;
FtpTicketRequst ftpTicketRequst = new FtpTicketRequst();
ftpTicketRequst.UserNameencryptedForFtpWithFtpKey = ftpTicketResponse.UserNameencryptedForFtpWithFtpKey;
ftpTicketRequst.SessionKeyClientFTPEncryptedForFTP = ftpTicketResponse.SessionKeyClientFTPEncryptedForFTP;
ftpTicketRequst.UserNameencryptedForFtpWithSessionKey = CAes.SimpleEncrypt(clientData.username, sessionKey, sessionKey);
ftpProxy.requstForConnectionWithSessionKey(ftpTicketRequst); // non blocking
//TODO: should set timer for time out
}
public void startSessionChatRemote()
{
byte[] readBuffer = new byte[1024];
bool sessionOk = false;
try
{
readBuffer = udpClient.Receive(ref ipPartnerEndPointRcv);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
byte[] sessionKey = null;
if (readBuffer != null)
{
clientPrivateData userData = ClientAllData.Instance.getMyClient();
sessionKey = CAes.SimpleDecrypt(readBuffer, userData.m_kdcAsSessionKey, userData.m_kdcAsSessionKey);
string challenge = Path.GetRandomFileName();
messageCreateChatRemoteToMaster sendMsgFromMaster = new messageCreateChatRemoteToMaster();;
sendMsgFromMaster.challenge = CAes.SimpleEncrypt(challenge, sessionKey, sessionKey);
sendMsgFromMaster.sessionKey = CAes.SimpleEncrypt(sessionKey, sessionKey, sessionKey);
m_binryFormatter.Serialize(m_memStreamer, sendMsgFromMaster);
byte[] buffer = m_memStreamer.ToArray();
udpClient.Send(buffer, buffer.Length, ipPartnerEndPointSend);
byte[] readBuffer2 = new byte[1024];
try
{
readBuffer2 = udpClient.Receive(ref ipPartnerEndPointRcv);
byte[] clientData = new byte[1024];
MemoryStream readSteam = new MemoryStream(readBuffer2);
messageCreateChatRemoteToMaster retMsgFromRemote = (messageCreateChatRemoteToMaster)m_binryFormatter.Deserialize(readSteam);
byte[] sessionKey2 = CAes.SimpleDecrypt(retMsgFromRemote.sessionKey, sessionKey, sessionKey);
string challenge2 = CAes.SimpleDecrypt(retMsgFromRemote.challenge, sessionKey, sessionKey);
if (StructuralComparisons.StructuralEqualityComparer.Equals(sessionKey2, sessionKey) && challenge2 == challenge)
{
sessionOk = true;
}
}
catch (Exception e)
{
//set session key
Console.WriteLine(e.ToString());
}
}
if (sessionOk)
{
m_sessionKey = sessionKey;
}
}
private void sendMessageBtn(object sender, RoutedEventArgs e)
{
string sendString = m_myUseruser.username + ": " + enterMessageTxtBox.Text + "\n";
byte[] stringBytes = Encoding.ASCII.GetBytes(sendString);
byte[] encryptedMsg = CAes.SimpleEncrypt(stringBytes, m_sessionKey, m_sessionKey);
udpClient.Send(encryptedMsg, encryptedMsg.Length, ipPartnerEndPointSend);
AllChatTxtBox.AppendText(sendString);
}
private void downLoadFileButton_Click(object sender, RoutedEventArgs e)
{
//send requst to the server
if (ftpFilesComboBox.IsEnabled == true)
{
if (ftpFilesComboBox.Text != null)
{
string encrypedFile = CAes.SimpleEncrypt(ftpFilesComboBox.Text, ClientAllData.Instance.getMyClient().m_ftpSessionKey, ClientAllData.Instance.getMyClient().m_ftpSessionKey);
ftpProxy.requstForDownloadFile(encrypedFile, ClientAllData.Instance.getMyUsername());
}
}
}
public CSessionKeyResponse GetSessionKeyForChatConnection(CSessionParams sessionParams)
{
// get users from the data base
User retUser1FromDB = m_DBservice.getUserByName(sessionParams.client1UserName);
User retUser2FromDB = m_DBservice.getUserByName(sessionParams.client2UserName);
UserServiceData localUser = users_list[sessionParams.client1UserName];
UserServiceData partnerUser = users_list[sessionParams.client2UserName];
// check validity
if (retUser1FromDB == null || retUser2FromDB == null || localUser == null || partnerUser == null)
{
if (retUser1FromDB == null)
{
Console.Write(sessionParams.client1UserName + "not exist in DB");
}
if (retUser2FromDB == null)
{
Console.Write(sessionParams.client2UserName + "not exist in DB");
}
if (localUser == null)
{
Console.Write(sessionParams.client1UserName + "not logged in");
}
if (partnerUser == null)
{
Console.Write(sessionParams.client2UserName + "not logged in");
}
return(null);
}
// genrate new session key
byte[] sessionKey = CAes.NewKey();
//encrypt Eka [ Ks || || Kb[Ks] ]
byte[] encryptedDataForClientB = CAes.SimpleEncrypt(sessionKey, partnerUser.SessionKey, partnerUser.SessionKey); //Kb[Ks]
byte[] keyA = CAes.SimpleEncrypt(sessionKey, localUser.SessionKey, localUser.SessionKey); //Ka[Ks]
byte[] keyAB = CAes.SimpleEncrypt(encryptedDataForClientB, localUser.SessionKey, localUser.SessionKey); //Ka[clientB data]
// set return value
CSessionKeyResponse retVal = new CSessionKeyResponse();
retVal.m_sessionKeyA = keyA;
retVal.m_sessionKeyB = keyAB;
users_list[sessionParams.client1UserName].clientKdcCallBack.startChatSession(retUser2FromDB.ID + 1100, retUser2FromDB.Name, true);
users_list[sessionParams.client2UserName].clientKdcCallBack.startChatSession(retUser1FromDB.ID + 1100, retUser1FromDB.Name, false);
return(retVal);
}
public void startChatSessionMaster()
{
bool sessionOk = false;
try
{
udpClient.Send(m_remoteKey, m_remoteKey.Length, ipPartnerEndPointSend);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
byte[] readBuffer = null;
try
{
readBuffer = udpClient.Receive(ref ipPartnerEndPointRcv);
byte[] clientData = new byte[1024];
MemoryStream readSteam = new MemoryStream(readBuffer);
messageCreateChatRemoteToMaster retMsgFromMaster = (messageCreateChatRemoteToMaster)m_binryFormatter.Deserialize(readSteam);
byte[] sessionKey = CAes.SimpleDecrypt(retMsgFromMaster.sessionKey, m_sessionKey, m_sessionKey);
if (StructuralComparisons.StructuralEqualityComparer.Equals(sessionKey, m_sessionKey))
{
string challenge = CAes.SimpleDecrypt(retMsgFromMaster.challenge, m_sessionKey, m_sessionKey);
string retChallengeEncryted = CAes.SimpleEncrypt(challenge, m_sessionKey, m_sessionKey);
byte[] encryptedSession = CAes.SimpleEncrypt(m_sessionKey, m_sessionKey, m_sessionKey);
messageCreateChatRemoteToMaster retMsgToMaster = new messageCreateChatRemoteToMaster();
retMsgToMaster.challenge = retChallengeEncryted;
retMsgToMaster.sessionKey = encryptedSession;
m_binryFormatter.Serialize(m_memStreamer, retMsgToMaster);
byte[] buffer = m_memStreamer.ToArray();
udpClient.Send(buffer, buffer.Length, ipPartnerEndPointSend);
sessionOk = true;
}
else
{
//error
return;
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
if (sessionOk)
{
}
}
public void requstForDownloadFile(string fileName, string clientName)
{
if (!users_list.ContainsKey(clientName))
{
return;
}
string decrryptedFileName = CAes.SimpleDecrypt(fileName, users_list[clientName].SessionKey, users_list[clientName].SessionKey);
string[] filesPaths = Directory.GetFiles("..\\..\\files\\",
decrryptedFileName, SearchOption.AllDirectories);
byte[] fileStream = File.ReadAllBytes(filesPaths[0]);
byte[] fileStreamEncrypted = CAes.SimpleEncrypt(fileStream, users_list[clientName].SessionKey, users_list[clientName].SessionKey);
users_list[clientName].clientFtpCallBack.finishRequstForDownloadFile(fileStreamEncrypted, fileName);
}
public static Dictionary <string, UserFtpServiceData> users_list = new Dictionary <string, UserFtpServiceData>(); // user, key_S
public void requstForConnectionWithSessionKey(FtpTicketRequst ftpTicketRequst)
{
IClientFtpCallBack iClientFtpCallBack = OperationContext.Current.GetCallbackChannel <IClientFtpCallBack>();
KdcFtpKey retKeyFromDB = m_FtpDBservice.getKdcFtpKey("KDC");
if (retKeyFromDB == null)
{
iClientFtpCallBack.finishRequstConnectionProcess(null);
return;
}
byte[] sessionKey = CAes.SimpleDecryptWithPassword(ftpTicketRequst.SessionKeyClientFTPEncryptedForFTP, retKeyFromDB.PassWord);
string usenameDecryptedWithFtpKdcKey = CAes.SimpleDecryptWithPassword(ftpTicketRequst.UserNameencryptedForFtpWithFtpKey, retKeyFromDB.PassWord);
string usenameDecryptedWithSessionKey = CAes.SimpleDecrypt(ftpTicketRequst.UserNameencryptedForFtpWithSessionKey, sessionKey, sessionKey);
if (usenameDecryptedWithFtpKdcKey == usenameDecryptedWithSessionKey) // OK
{
UserFtpServiceData userData = new UserFtpServiceData(sessionKey, iClientFtpCallBack);
users_list.Add(usenameDecryptedWithFtpKdcKey, userData);
string fileNameResult;
string[] filesPaths = Directory.GetFiles("..\\..\\files\\",
"*.*", SearchOption.AllDirectories);
List <string> newFilesNames = new List <string>();
// Display all the files.
foreach (string path in filesPaths)
{
fileNameResult = Path.GetFileName(path);
string fileNameResultString = CAes.SimpleEncrypt(fileNameResult, sessionKey, sessionKey);
newFilesNames.Add(fileNameResultString);
}
iClientFtpCallBack.finishRequstConnectionProcess(newFilesNames);
return;
}
iClientFtpCallBack.finishRequstConnectionProcess(null);
}
private void login_worker_DoWork(object sender, DoWorkEventArgs e)
{
bool looginSuccess = false;
IKdcService proxy = KdcProxy.Instance.GetProxy();
string usernameInvoked = string.Empty;
string passwordInvoked = string.Empty;
Dispatcher.BeginInvoke(new Action(delegate
{
usernameInvoked = txtUserName.Text;
passwordInvoked = txtPassWord.Password.ToString();
}));
Thread.Sleep(100);
// try to log in to the server
ClientAllData.Instance.setMyUsername(usernameInvoked);
CKdcToClientLogInData logginData = proxy.LogInApp(usernameInvoked);
// parse the result
if (logginData != null)
{
string passWordHash = string.Empty;
using (MD5 md5Hash = MD5.Create())
{
passWordHash = CMd5hash.GetMd5Hash(md5Hash, passwordInvoked);
}
string retDecUserName = CAes.SimpleDecryptWithPassword(logginData.m_username, passWordHash);
byte[] retDecPassword = CAes.SimpleDecryptWithPassword(logginData.m_kdcAsSessionKey, passWordHash);
byte[] localPortByte = CAes.SimpleDecryptWithPassword(logginData.m_localPort, passWordHash);
int localPort = BitConverter.ToInt32(localPortByte, 0);
if (retDecUserName == usernameInvoked)
{
string retChallenge = CAes.SimpleDecryptWithPassword(logginData.m_challenge, passWordHash);
CLogInStatus logginStatus = new CLogInStatus();
logginStatus.m_username = retDecUserName;
logginStatus.m_logInFail = false;
logginStatus.m_challenge = CAes.SimpleEncrypt(retChallenge + retChallenge, retDecPassword, retDecPassword);
if (proxy.SetLoginStatus(logginStatus))
{
clientPrivateData myClient = ClientAllData.Instance.getMyClient();
myClient.username = retDecUserName;
myClient.m_kdcAsSessionKey = retDecPassword;
myClient.m_loginSucccess = true;
myClient.m_localPort = localPort;
looginSuccess = true;
}
}
}
if (!looginSuccess)
{
CLogInStatus logginStatus = new CLogInStatus();
logginStatus.m_username = usernameInvoked;
logginStatus.m_logInFail = true;
proxy.SetLoginStatus(logginStatus);
}
}
private void remoteHandshake()
{
byte[] readBuffer = new byte[1024];
bool sessionOk = false;
try
{
readBuffer = udpClient.Receive(ref ipPartnerEndPointRcv);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
byte[] sessionKey = null;
if (readBuffer != null)
{
sessionKey = CAes.SimpleDecrypt(readBuffer, m_myUseruser.m_kdcAsSessionKey, m_myUseruser.m_kdcAsSessionKey);
m_sessionKey = sessionKey;
string challenge = System.IO.Path.GetRandomFileName();
messageCreateChatRemoteToMaster sendMsgFromMaster = new messageCreateChatRemoteToMaster();;
sendMsgFromMaster.challenge = CAes.SimpleEncrypt(challenge, sessionKey, sessionKey);
sendMsgFromMaster.sessionKey = CAes.SimpleEncrypt(sessionKey, sessionKey, sessionKey);
m_binryFormatter.Serialize(m_memStreamer, sendMsgFromMaster);
byte[] buffer = m_memStreamer.ToArray();
udpClient.Send(buffer, buffer.Length, ipPartnerEndPointSend);
byte[] readBuffer2 = new byte[1024];
try
{
readBuffer2 = udpClient.Receive(ref ipPartnerEndPointRcv);
byte[] clientData = new byte[1024];
MemoryStream readSteam = new MemoryStream(readBuffer2);
messageCreateChatRemoteToMaster retMsgFromRemote = (messageCreateChatRemoteToMaster)m_binryFormatter.Deserialize(readSteam);
byte[] sessionKey2 = CAes.SimpleDecrypt(retMsgFromRemote.sessionKey, sessionKey, sessionKey);
string challenge2 = CAes.SimpleDecrypt(retMsgFromRemote.challenge, sessionKey, sessionKey);
if (StructuralComparisons.StructuralEqualityComparer.Equals(sessionKey2, sessionKey) && challenge2 == challenge + challenge)
{
sessionOk = true;
}
}
catch (Exception e)
{
//set session key
Console.WriteLine(e.ToString());
}
}
if (sessionOk)
{
MessageBoxResult messageBoxResult = System.Windows.MessageBox.Show("confirm chat with " + m_userPort.userName, "Confirmation", System.Windows.MessageBoxButton.YesNo);
if (messageBoxResult == MessageBoxResult.Yes)
{
string confirmStr = "confirm";
byte[] confirmStringBytes = Encoding.ASCII.GetBytes(confirmStr);
byte[] encryptedMsg = CAes.SimpleEncrypt(confirmStringBytes, m_sessionKey, m_sessionKey);
udpClient.Send(encryptedMsg, encryptedMsg.Length, ipPartnerEndPointSend);
var evt = setShowChatWindowEvnt;
if (evt != null)
{
evt(this, "");
}
readChatMsg();
}
else
{
return;
}
}
}
private void masterHandshake()
{
while (m_sessionRespons == null)
{
Thread.Sleep(100);
}
m_sessionKey = CAes.SimpleDecrypt(m_sessionRespons.m_sessionKeyA, m_myUseruser.m_kdcAsSessionKey, m_myUseruser.m_kdcAsSessionKey);
m_remoteKey = CAes.SimpleDecrypt(m_sessionRespons.m_sessionKeyB, m_myUseruser.m_kdcAsSessionKey, m_myUseruser.m_kdcAsSessionKey);
bool sessionOk = false;
try
{
udpClient.Send(m_remoteKey, m_remoteKey.Length, ipPartnerEndPointSend);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
byte[] readBuffer = null;
try
{
readBuffer = udpClient.Receive(ref ipPartnerEndPointRcv);
byte[] clientData = new byte[1024];
MemoryStream readSteam = new MemoryStream(readBuffer);
messageCreateChatRemoteToMaster retMsgFromMaster = (messageCreateChatRemoteToMaster)m_binryFormatter.Deserialize(readSteam);
byte[] sessionKey = CAes.SimpleDecrypt(retMsgFromMaster.sessionKey, m_sessionKey, m_sessionKey);
if (StructuralComparisons.StructuralEqualityComparer.Equals(sessionKey, m_sessionKey))
{
string challenge = CAes.SimpleDecrypt(retMsgFromMaster.challenge, m_sessionKey, m_sessionKey);
string retChallengeEncryted = CAes.SimpleEncrypt(challenge + challenge, m_sessionKey, m_sessionKey);
byte[] encryptedSession = CAes.SimpleEncrypt(m_sessionKey, m_sessionKey, m_sessionKey);
messageCreateChatRemoteToMaster retMsgToMaster = new messageCreateChatRemoteToMaster();
retMsgToMaster.challenge = retChallengeEncryted;
retMsgToMaster.sessionKey = encryptedSession;
m_binryFormatter.Serialize(m_memStreamer, retMsgToMaster);
byte[] buffer = m_memStreamer.ToArray();
udpClient.Send(buffer, buffer.Length, ipPartnerEndPointSend);
sessionOk = true;
}
else
{
//error
return;
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
if (sessionOk)
{
byte[] readBufferConfirm = new byte[1024];
readBufferConfirm = udpClient.Receive(ref ipPartnerEndPointRcv);
byte[] readBufferConfirmBytes = CAes.SimpleDecrypt(readBufferConfirm, m_sessionKey, m_sessionKey);
string retStringConfirm = Encoding.ASCII.GetString(readBufferConfirmBytes);
if (retStringConfirm == "confirm")
{
var evt = setShowChatWindowEvnt;
if (evt != null)
{
evt(this, "");
}
readChatMsg();
}
else
{
;
}
{
return;
}
}
}