Пример #1
0
        protected virtual void ReceiveNewSessionTicketMessage(MemoryStream buf)
        {
            NewSessionTicket newSessionTicket = NewSessionTicket.Parse(buf);

            AssertEmpty(buf);

            mTlsClient.NotifyNewSessionTicket(newSessionTicket);
        }
Пример #2
0
        protected virtual void ProcessNewSessionTicket(ClientHandshakeState state, byte[] body)
        {
            MemoryStream buf = new MemoryStream(body, false);

            NewSessionTicket newSessionTicket = NewSessionTicket.Parse(buf);

            TlsProtocol.AssertEmpty(buf);

            state.client.NotifyNewSessionTicket(newSessionTicket);
        }
Пример #3
0
        protected virtual void SendNewSessionTicketMessage(NewSessionTicket newSessionTicket)
        {
            if (newSessionTicket == null)
            {
                throw new TlsFatalAlert(AlertDescription.internal_error);
            }

            HandshakeMessage message = new HandshakeMessage(HandshakeType.session_ticket);

            newSessionTicket.Encode(message);

            message.WriteToRecordStream(this);
        }
Пример #4
0
        internal virtual DtlsTransport ServerHandshake(ServerHandshakeState state, DtlsRecordLayer recordLayer)
        {
            SecurityParameters    securityParameters = state.serverContext.SecurityParameters;
            DtlsReliableHandshake handshake          = new DtlsReliableHandshake(state.serverContext, recordLayer);

            DtlsReliableHandshake.Message clientMessage = handshake.ReceiveMessage();

            // NOTE: DTLSRecordLayer requires any DTLS version, we don't otherwise constrain this
            //ProtocolVersion recordLayerVersion = recordLayer.ReadVersion;

            if (clientMessage.Type == HandshakeType.client_hello)
            {
                ProcessClientHello(state, clientMessage.Body);
            }
            else
            {
                throw new TlsFatalAlert(AlertDescription.unexpected_message);
            }

            {
                byte[] serverHelloBody = GenerateServerHello(state);

                ApplyMaxFragmentLengthExtension(recordLayer, securityParameters.maxFragmentLength);

                ProtocolVersion recordLayerVersion = state.serverContext.ServerVersion;
                recordLayer.ReadVersion = recordLayerVersion;
                recordLayer.SetWriteVersion(recordLayerVersion);

                handshake.SendMessage(HandshakeType.server_hello, serverHelloBody);
            }

            handshake.NotifyHelloComplete();

            IList serverSupplementalData = state.server.GetServerSupplementalData();

            if (serverSupplementalData != null)
            {
                byte[] supplementalDataBody = GenerateSupplementalData(serverSupplementalData);
                handshake.SendMessage(HandshakeType.supplemental_data, supplementalDataBody);
            }

            state.keyExchange = state.server.GetKeyExchange();
            state.keyExchange.Init(state.serverContext);

            state.serverCredentials = state.server.GetCredentials();

            Certificate serverCertificate = null;

            if (state.serverCredentials == null)
            {
                state.keyExchange.SkipServerCredentials();
            }
            else
            {
                state.keyExchange.ProcessServerCredentials(state.serverCredentials);

                serverCertificate = state.serverCredentials.Certificate;
                byte[] certificateBody = GenerateCertificate(serverCertificate);
                handshake.SendMessage(HandshakeType.certificate, certificateBody);
            }

            // TODO[RFC 3546] Check whether empty certificates is possible, allowed, or excludes CertificateStatus
            if (serverCertificate == null || serverCertificate.IsEmpty)
            {
                state.allowCertificateStatus = false;
            }

            if (state.allowCertificateStatus)
            {
                CertificateStatus certificateStatus = state.server.GetCertificateStatus();
                if (certificateStatus != null)
                {
                    byte[] certificateStatusBody = GenerateCertificateStatus(state, certificateStatus);
                    handshake.SendMessage(HandshakeType.certificate_status, certificateStatusBody);
                }
            }

            byte[] serverKeyExchange = state.keyExchange.GenerateServerKeyExchange();
            if (serverKeyExchange != null)
            {
                handshake.SendMessage(HandshakeType.server_key_exchange, serverKeyExchange);
            }

            if (state.serverCredentials != null)
            {
                state.certificateRequest = state.server.GetCertificateRequest();
                if (state.certificateRequest != null)
                {
                    if (TlsUtilities.IsTlsV12(state.serverContext) != (state.certificateRequest.SupportedSignatureAlgorithms != null))
                    {
                        throw new TlsFatalAlert(AlertDescription.internal_error);
                    }

                    state.keyExchange.ValidateCertificateRequest(state.certificateRequest);

                    byte[] certificateRequestBody = GenerateCertificateRequest(state, state.certificateRequest);
                    handshake.SendMessage(HandshakeType.certificate_request, certificateRequestBody);

                    TlsUtilities.TrackHashAlgorithms(handshake.HandshakeHash,
                                                     state.certificateRequest.SupportedSignatureAlgorithms);
                }
            }

            handshake.SendMessage(HandshakeType.server_hello_done, TlsUtilities.EmptyBytes);

            handshake.HandshakeHash.SealHashAlgorithms();

            clientMessage = handshake.ReceiveMessage();

            if (clientMessage.Type == HandshakeType.supplemental_data)
            {
                ProcessClientSupplementalData(state, clientMessage.Body);
                clientMessage = handshake.ReceiveMessage();
            }
            else
            {
                state.server.ProcessClientSupplementalData(null);
            }

            if (state.certificateRequest == null)
            {
                state.keyExchange.SkipClientCredentials();
            }
            else
            {
                if (clientMessage.Type == HandshakeType.certificate)
                {
                    ProcessClientCertificate(state, clientMessage.Body);
                    clientMessage = handshake.ReceiveMessage();
                }
                else
                {
                    if (TlsUtilities.IsTlsV12(state.serverContext))
                    {
                        /*
                         * RFC 5246 If no suitable certificate is available, the client MUST send a
                         * certificate message containing no certificates.
                         *
                         * NOTE: In previous RFCs, this was SHOULD instead of MUST.
                         */
                        throw new TlsFatalAlert(AlertDescription.unexpected_message);
                    }

                    NotifyClientCertificate(state, Certificate.EmptyChain);
                }
            }

            if (clientMessage.Type == HandshakeType.client_key_exchange)
            {
                ProcessClientKeyExchange(state, clientMessage.Body);
            }
            else
            {
                throw new TlsFatalAlert(AlertDescription.unexpected_message);
            }

            TlsHandshakeHash prepareFinishHash = handshake.PrepareToFinish();

            securityParameters.sessionHash = TlsProtocol.GetCurrentPrfHash(state.serverContext, prepareFinishHash, null);

            TlsProtocol.EstablishMasterSecret(state.serverContext, state.keyExchange);
            recordLayer.InitPendingEpoch(state.server.GetCipher());

            /*
             * RFC 5246 7.4.8 This message is only sent following a client certificate that has signing
             * capability (i.e., all certificates except those containing fixed Diffie-Hellman
             * parameters).
             */
            if (ExpectCertificateVerifyMessage(state))
            {
                byte[] certificateVerifyBody = handshake.ReceiveMessageBody(HandshakeType.certificate_verify);
                ProcessCertificateVerify(state, certificateVerifyBody, prepareFinishHash);
            }

            // NOTE: Calculated exclusive of the actual Finished message from the client
            byte[] expectedClientVerifyData = TlsUtilities.CalculateVerifyData(state.serverContext, ExporterLabel.client_finished,
                                                                               TlsProtocol.GetCurrentPrfHash(state.serverContext, handshake.HandshakeHash, null));
            ProcessFinished(handshake.ReceiveMessageBody(HandshakeType.finished), expectedClientVerifyData);

            if (state.expectSessionTicket)
            {
                NewSessionTicket newSessionTicket     = state.server.GetNewSessionTicket();
                byte[]           newSessionTicketBody = GenerateNewSessionTicket(state, newSessionTicket);
                handshake.SendMessage(HandshakeType.session_ticket, newSessionTicketBody);
            }

            // NOTE: Calculated exclusive of the Finished message itself
            byte[] serverVerifyData = TlsUtilities.CalculateVerifyData(state.serverContext, ExporterLabel.server_finished,
                                                                       TlsProtocol.GetCurrentPrfHash(state.serverContext, handshake.HandshakeHash, null));
            handshake.SendMessage(HandshakeType.finished, serverVerifyData);

            handshake.Finish();

            state.server.NotifyHandshakeComplete();

            return(new DtlsTransport(recordLayer));
        }
Пример #5
0
        protected virtual byte[] GenerateNewSessionTicket(ServerHandshakeState state, NewSessionTicket newSessionTicket)
        {
            MemoryStream buf = new MemoryStream();

            newSessionTicket.Encode(buf);
            return(buf.ToArray());
        }
Пример #6
0
 public virtual void NotifyNewSessionTicket(NewSessionTicket newSessionTicket)
 {
 }