Пример #1
0
        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();
        }
Пример #2
0
        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);
        }
Пример #3
0
        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();
        }
Пример #4
0
        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);
        }
Пример #5
0
        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);
        }