public void TrustContact(int contactId)
{
Pull();
Log("Sending TRUST_CONTACT command.");
TextEncoder.SendCommand(stream, ConnectionCommand.TRUST_CONTACT);
TextEncoder.SendInt(stream, contactId);
using (Context context = new Context(config))
{
var contact = context.Contacts
.Where(u => u.PublicId == contactId)
.SingleOrDefault();
contact.Trusted = 1;
context.SaveChanges();
if (contact.SendAesKey == null)
{
AESPassword password = AESPassword.GenerateAESPassword();
JAESKey key = new JAESKey(contactId, password);
PushOperations.SendIJType(context, key, UserId, UserId);
X509Certificate2 cert = X509Certificate2Utils.ImportFromPem(
context.Contacts
.Where(u => u.PublicId == contactId)
.Select(u => u.PublicCertificate)
.SingleOrDefault());
BinaryEncoder.SendBytes(stream, RSAEncoder.Encrypt(password.Password, cert));
context.SaveChanges();
}
}
Push();
}
public static ConnectionInfo Run(Stream stream, Action <string> log, ServerConfig config)
{
ClientHandshake clientHandshake = TextEncoder.ReadJson <ClientHandshake>(stream);
X509Certificate2 clientCertificate = X509Certificate2Utils.ImportFromPem(clientHandshake.PemCertificate);
log($"Logging user sent username {clientHandshake.UserName}\n Certificate:\n {clientHandshake.PemCertificate}");
ServerHandshake errorHandshake = new ServerHandshake()
{
Errors = "",
NewUser = false,
Succeeded = false,
UserId = -1,
UserName = ""
};
if (config.Password != null && !config.Password.Equals(clientHandshake.ServerPassword))
{
errorHandshake.Errors = "Server password is wrong.";
TextEncoder.SendJson(stream, errorHandshake);
throw new Exception(errorHandshake.Errors);
}
log("Generating random bytes");
byte[] randomBytes = LUtils.GenerateRandomBytes(TcpConstants.HANDSHAKE_LENGHT);
log("Sending encrypted bytes");
BinaryEncoder.SendBytes(stream, RSAEncoder.Encrypt(randomBytes, clientCertificate));
byte[] received = BinaryEncoder.ReceiveBytes(stream);
if (!randomBytes.SequenceEqual(received))
{
log("Client's certificate verification failed.");
errorHandshake.Errors = "Client's certificate verification failed.";
TextEncoder.SendJson(stream, errorHandshake);
throw new Exception(errorHandshake.Errors);
}
log("Certificate verification succeeded.");
Users user;
String message;
Clients client;
byte[] aesKey = null;
bool newUser = false;
using (Context context = new Context(config))
{
byte[] hash = SHA256Utils.ComputeByteSha256Hash(clientCertificate);
user = context.Users.SingleOrDefault(u => u.PublicCertificateSha256.SequenceEqual(hash));
if (user == null)
{
log("User doesn't exist yet. I'll try to create him.");
newUser = true;
log("Checking the uniquity of username.");
String userName = clientHandshake.UserName;
if (context.Users.SingleOrDefault(u => u.UserName.Equals(userName)) != null)
{
errorHandshake.Errors = "Username isn't unique.";
TextEncoder.SendJson(stream, errorHandshake);
throw new Exception(errorHandshake.Errors);
}
else if (userName.Length > 45)
{
errorHandshake.Errors = "Username is too long (max. 45 chars)";
TextEncoder.SendJson(stream, errorHandshake);
throw new Exception(errorHandshake.Errors);
}
else if (userName.Length < 4)
{
errorHandshake.Errors = "Username is too short (min. 4 chars)";
TextEncoder.SendJson(stream, errorHandshake);
throw new Exception(errorHandshake.Errors);
}
else if (!Validators.ValidateRegexUserName(userName))
{
errorHandshake.Errors = "Username must match this regex ^[a-zA-Z][-a-zA-Z0-9_]+$ (Vaguely can't contain special chars and spaces)";
TextEncoder.SendJson(stream, errorHandshake);
throw new Exception(errorHandshake.Errors);
}
log("Creating user.");
user = new Users()
{
PublicCertificate = clientHandshake.PemCertificate,
PublicCertificateSha256 = hash,
UserName = clientHandshake.UserName
};
context.Users.Add(user);
context.SaveChanges();
message = "User successfully created.";
log("User successfully created.");
}
else
{
message = "User exists.";
log("User exists.");
}
client = new Clients()
{
UserId = user.Id
};
if (clientHandshake.ClientId == null)
{
log($"Loading self-aes key.");
aesKey = context.UsersKeys
.Where(u => u.RecepientId == user.Id)
.Where(u => u.SenderId == user.Id)
.Select(u => u.AesKey)
.SingleOrDefault();
context.Add(client);
context.SaveChanges();
log($"Added client with Id {client.Id}.");
}
else
{
client.Id = (int)clientHandshake.ClientId;
if (context.Clients.Where(u => u.Id == client.Id).Single().UserId != user.Id)
{
errorHandshake.Errors = "This client id isn't owned by this user.";
TextEncoder.SendJson(stream, errorHandshake);
throw new Exception(errorHandshake.Errors);
}
log($"Client with Id {client.Id} has logged in.");
}
}
ServerHandshake toSend = new ServerHandshake()
{
Errors = message,
NewUser = newUser,
Succeeded = true,
UserId = user.Id,
UserName = user.UserName,
ClientId = client.Id,
SelfAesKey = aesKey
};
TextEncoder.SendJson(stream, toSend);
ConnectionInfo ret = new ConnectionInfo(user, clientCertificate, client.Id);
log($"Handshake successeded. User {ret.UserName} with id {ret.UserId} has logged in. Client has id {client.Id}.");
return(ret);
}
public void TrustContact(int contactId)
{
ThrowExceptionIfNotConnected();
Pull();
lock (mutex)
{
Log("Sending TRUST_CONTACT command.");
BinaryEncoder.SendCommand(stream, ConnectionCommand.TRUST_CONTACT);
BinaryEncoder.SendInt(stream, contactId);
using (Context context = new Context(config))
{
var contact = new UContact(context.Contacts
.Where(u => u.PublicId == contactId)
.SingleOrDefault())
{
Trusted = true
};
if (contact.SendAesKey == null)
{
Log("Sending new key.");
BinaryEncoder.SendInt(stream, 1);
AESPassword password = AESPassword.GenerateAESPassword();
contact.SendAesKey = password.Password;
X509Certificate2 recepientCert = X509Certificate2Utils.ImportFromPem(
context.Contacts
.Where(u => u.PublicId == contactId)
.Select(u => u.PublicCertificate)
.SingleOrDefault());
byte[] toSend = RSAEncoder.EncryptAndSign(password.Password, recepientCert, MyCertificate);
BinaryEncoder.SendBytes(stream, toSend);
}
else
{
Log("No new key will be sended.");
BinaryEncoder.SendInt(stream, 0);
}
if (contactId != this.UserId)
{
PushOperations.SendJsonCapsula(context, contact.GetSelfUpdate(), UserId, UserId);
}
else
{
var me = context.Contacts
.Where(u => u.PublicId == UserId)
.Single();
me.SendAesKey = contact.SendAesKey;
me.ReceiveAesKey = contact.ReceiveAesKey;
}
context.SaveChanges();
}
Log("Trustification has been done.");
}
Push();
}
public int Pull()
{
int changes = 0;
ThrowExceptionIfNotConnected();
lock (mutex)
{
Log("Sending PULL command.");
BinaryEncoder.SendCommand(stream, ConnectionCommand.PULL);
#if (DEBUG)
Log("Sending ClientPullCapsula.");
#endif
ClientPullCapsula clientCapsula;
using (Context context = new Context(config))
{
clientCapsula = new ClientPullCapsula()
{
AesKeysUserIds = context.Contacts
.Where(u => u.ReceiveAesKey == null)
.Select(u => u.PublicId)
.ToArray()
};
}
TextEncoder.SendJson(stream, clientCapsula);
ServerPullCapsula capsula = TextEncoder.ReadJson <ServerPullCapsula>(stream);
#if (DEBUG)
Log("Received ServerPullCapsula.");
#endif
changes += capsula.AesKeysUserIds.Count;
changes += capsula.Messages.Count;
using (Context context = new Context(config))
{
#if (DEBUG)
Log("Receiving and saving AES keys.");
#endif
foreach (var id in capsula.AesKeysUserIds)
{
var user = new UContact(context.Contacts.Where(con => con.PublicId == id).SingleOrDefault());
try
{
user.ReceiveAesKey = RSAEncoder.DecryptAndVerify(BinaryEncoder.ReceiveBytes(stream), MyCertificate, X509Certificate2Utils.ImportFromPem(user.PublicCertificate));
}
catch (Exception ex)
{
Log($"Loading of Receive AESKey from {user.PublicId} has failed.");
logger.LogException(this, ex);
}
PushOperations.Update(context, user, UserId, UserId);
}
context.SaveChanges();
#if (DEBUG)
Log("Receiving and saving messages.");
#endif
foreach (PullMessage metaMessage in capsula.Messages)
{
BlobMessages metaBlob = new BlobMessages()
{
PublicId = metaMessage.PublicId,
SenderId = metaMessage.SenderId,
Failed = 0,
DoDelete = 0
};
context.BlobMessages.Add(metaBlob);
context.SaveChanges();
try
{
PullMessageParser.ParseEncryptedMessage(context, BinaryEncoder.ReceiveBytes(stream), metaBlob.SenderId, metaBlob.Id, UserId);
}
catch (Exception ex)
{
Log($"Loading of message {metaMessage.PublicId} has failed.");
metaBlob.Failed = 1;
logger.LogException(this, ex);
}
context.SaveChanges();
}
}
Log("Pull have been done.");
}
return(changes);
}
public static UserCapsula Run(Stream stream, Action <string> log, ServerConfig config)
{
ClientHandshake clientHandshake = TextEncoder.ReadClientHandshake(stream);
X509Certificate2 clientCertificate = X509Certificate2Utils.ImportFromPem(clientHandshake.PemCertificate);
log($"Logging user sent username {clientHandshake.UserName}\n Certificate:\n {clientHandshake.PemCertificate}");
log("Generating random bytes");
byte[] randomBytes = LUtils.GenerateRandomBytes(TcpConstants.HANDSHAKE_LENGHT);
log("Sending encrypted bytes");
BinaryEncoder.SendBytes(stream, RSAEncoder.Encrypt(randomBytes, clientCertificate));
ServerHandshake errorHandshake = new ServerHandshake()
{
Errors = "",
NewUser = false,
Succeeded = false,
UserId = -1,
UserName = ""
};
byte[] received = BinaryEncoder.ReceiveBytes(stream);
if (!randomBytes.SequenceEqual(received))
{
log("Sending error to client.");
errorHandshake.Errors = "Client's certificate verification failed.";
TextEncoder.SendJson(stream, errorHandshake);
throw new Exception(errorHandshake.Errors);
}
log("Certificate verification succeeded.");
Users user;
String message;
Clients client;
bool newUser = false;
using (Context context = new Context(config))
{
SHA1 sha = new SHA1CryptoServiceProvider();
byte[] hash = sha.ComputeHash(clientCertificate.RawData);
user = context.Users.SingleOrDefault(u => u.PublicCertificateSha1.SequenceEqual(hash));
if (user == null)
{
log("User doesn't exist yet. I'll try to create him.");
newUser = true;
log("Checking the uniquity of username.");
String userName = clientHandshake.UserName;
if (context.Users.SingleOrDefault(u => u.UserName.Equals(userName)) != null)
{
log("Username isn't unique.");
errorHandshake.Errors = "Username isn't unique.";
TextEncoder.SendJson(stream, errorHandshake);
throw new Exception(errorHandshake.Errors);
}
log("Creating user.");
user = new Users()
{
PublicCertificate = clientHandshake.PemCertificate,
PublicCertificateSha1 = hash,
UserName = clientHandshake.UserName
};
context.Users.Add(user);
context.SaveChanges();
message = "User successfully created.";
log("User successfully created.");
}
else
{
message = "User exists.";
log("User exists.");
}
client = new Clients()
{
UserId = user.Id
};
if (clientHandshake.ClientId == null)
{
context.Add(client);
context.SaveChanges();
log($"Added client with Id {client.Id}.");
}
else
{
log($"Client with Id {client.Id} has logged in.");
}
}
ServerHandshake toSend = new ServerHandshake()
{
Errors = message,
NewUser = newUser,
Succeeded = true,
UserId = user.Id,
UserName = user.UserName,
ClientId = client.Id
};
TextEncoder.SendJson(stream, toSend);
UserCapsula ret = new UserCapsula(user, clientCertificate);
log($"Handshake successeded. User {ret.UserName} with id {ret.UserId} has logged in");
return(ret);
}
