public static void SendMessage(Message msg, KeyStore ks)
{
byte[] convAesKey = null;
int recipientId = -1;
using (DataContext db = new DataContext())
{
var conv = GetConversation(msg.SenderId, msg.RecipientId, db);
msg.ConversationId = conv.ConId;
// Non-blocking execution of setting unread
Task.Run(() => SetUnread(conv.ConId, msg.RecipientId));
if (msg.SenderId == conv.UserAId)
{
convAesKey = Crypt.Instance.DecryptRsa(conv.KeyA, ks.rsaPrivate);
recipientId = conv.UserBId;
}
else if (msg.SenderId == conv.UserBId)
{
convAesKey = Crypt.Instance.DecryptRsa(conv.KeyB, ks.rsaPrivate);
recipientId = conv.UserAId;
}
SecureMessage dbMsg = msg.ToDatabase(recipientId, convAesKey);
if (convAesKey == null || recipientId == -1)
{
throw new ChatException("Recipient invalid or message could not be encrypted");
}
// Add to database
db.SecureMessage.Add(dbMsg);
db.SaveChanges();
}
}
/// <summary>
/// Validate the user's password
/// </summary>
/// <param name="password">The user's password</param>
/// <param name="checkEmailValidity">Whether to check if the email address is verified</param>
/// <returns></returns>
internal AuthResult ValidateLogin(string password, bool checkEmailValidity = true)
{
using (DataContext db = new DataContext())
{
Users user = Users.FindByEmail(this.Email, db);
if (user == null)
{
AuthLogger.Instance.UserNotFound(Email);
return(AuthResult.UserNotFound);
}
// Check IP
string userip = GetIP();
if (UserIPList.CheckUserIPList(userip, user, db))
{
Debug.WriteLine("CHK TRUE");
MailClient m = new MailClient(Email);
m.Subject = "Unrecognised login from IP Address " + userip;
m.AddLine("An unrecognised login has been found");
m.AddLine("If this wasn't you, please contact us.");
m.Send(user.FullName, "Contact Us", "https://haxnet.azurewebsites.net/Contact");
}
else
{
Debug.WriteLine("CHK FALSE");
}
if (checkEmailValidity && !EmailConfirm.IsEmailValidated(user))
{
EmailConfirm.SendEmailForConfirmation(user, db);
return(AuthResult.EmailNotVerified);
}
byte[] bPassword = Encoding.UTF8.GetBytes(password);
byte[] bSalt = user.Salt;
byte[] bHash = Crypt.Instance.Hash(bPassword, bSalt);
if (user.Hash.SequenceEqual(bHash))
{
AuthLogger.Instance.PasswordSuccess(user.Email, user.UserID);
}
else
{
AuthLogger.Instance.PasswordFail(user.Email, user.UserID);
return(AuthResult.PasswordIncorrect);
}
try
{
db.Entry(user).Reference(usr => usr.UserKeyStore).Load();
if (user.UserKeyStore == null)
{
user.UserKeyStore = KeyStore.DefaultDbKeyStore(password, bSalt, user.UserID);
db.SaveChanges();
}
TempKeyStore = new KeyStore(user.UserKeyStore, password, bSalt);
return(AuthResult.Success);
} catch (KeyStoreException) {
return(AuthResult.KeyStoreInvalid);
}
}
throw new AuthException("Login has no result, database failure might have occured.");
}
public static ICollection <Message> RetrieveMessages(int retriever, int other, KeyStore ks, int amount = -1)
{
ICollection <Message> decryptedMessages = new List <Message>();
List <SecureMessage> dbMsgList = null;
byte[] convAesKey = null;
Stopwatch sw = new Stopwatch();
sw.Start();
using (DataContext db = new DataContext())
{
var dbConv = GetConversation(retriever, other, db);
if (dbConv == null)
{
throw new ChatException("Message could not be retrieved");
}
if (retriever == dbConv.UserAId)
{
convAesKey = Crypt.Instance.DecryptRsa(dbConv.KeyA, ks.rsaPrivate);
if (dbConv.UnreadForA == true)
{
dbConv.UnreadForA = false;
db.SaveChanges();
}
}
else if (retriever == dbConv.UserBId)
{
convAesKey = Crypt.Instance.DecryptRsa(dbConv.KeyB, ks.rsaPrivate);
if (dbConv.UnreadForB == true)
{
dbConv.UnreadForB = false;
db.SaveChanges();
}
}
if (convAesKey == null)
{
throw new ChatException("Message could not be decrypted (AES from RSA)");
}
// DB Query for messages that match query
var dbMsgQueryable = db.SecureMessage
.Where(m => (m.ConId == dbConv.ConId))
.OrderByDescending(m => m.MsgId);
int rows = dbMsgQueryable.Count();
// If the number of rows exceeds the number of rows, return all the rows
if (amount > rows)
{
amount = -1;
}
// Get the specified number of rows from the database
if (amount > 0)
{
dbMsgList = dbMsgQueryable.Take(amount).ToList();
}
else
{
dbMsgList = dbMsgQueryable.ToList();
}
// Convert each message into decrypted form
foreach (SecureMessage dbMsg in dbMsgList)
{
decryptedMessages.Add(new Message(dbMsg, convAesKey));
}
sw.Stop();
Debug.WriteLine("Messages retrieval & decryption took: " + sw.ElapsedMilliseconds + "ms");
}
return(decryptedMessages.Reverse().ToList());
}
