protected virtual byte[] GenerateClientHello(ClientHandshakeState state, TlsClient client)
        {
            //IL_0000: Unknown result type (might be due to invalid IL or missing references)
            //IL_0006: Expected O, but got Unknown
            MemoryStream    val           = new MemoryStream();
            ProtocolVersion clientVersion = client.ClientVersion;

            if (!clientVersion.IsDtls)
            {
                throw new TlsFatalAlert(80);
            }
            TlsClientContextImpl clientContext = state.clientContext;

            clientContext.SetClientVersion(clientVersion);
            TlsUtilities.WriteVersion(clientVersion, (Stream)(object)val);
            SecurityParameters securityParameters = clientContext.SecurityParameters;

            ((Stream)val).Write(securityParameters.ClientRandom, 0, securityParameters.ClientRandom.Length);
            byte[] array = TlsUtilities.EmptyBytes;
            if (state.tlsSession != null)
            {
                array = state.tlsSession.SessionID;
                if (array == null || array.Length > 32)
                {
                    array = TlsUtilities.EmptyBytes;
                }
            }
            TlsUtilities.WriteOpaque8(array, (Stream)(object)val);
            TlsUtilities.WriteOpaque8(TlsUtilities.EmptyBytes, (Stream)(object)val);
            bool isFallback = client.IsFallback;

            state.offeredCipherSuites = client.GetCipherSuites();
            state.clientExtensions    = client.GetClientExtensions();
            byte[] extensionData = TlsUtilities.GetExtensionData(state.clientExtensions, 65281);
            bool   flag          = null == extensionData;
            bool   flag2         = !Arrays.Contains(state.offeredCipherSuites, 255);

            if (flag && flag2)
            {
                state.offeredCipherSuites = Arrays.Append(state.offeredCipherSuites, 255);
            }
            if (isFallback && !Arrays.Contains(state.offeredCipherSuites, 22016))
            {
                state.offeredCipherSuites = Arrays.Append(state.offeredCipherSuites, 22016);
            }
            TlsUtilities.WriteUint16ArrayWithUint16Length(state.offeredCipherSuites, (Stream)(object)val);
            byte[] array2 = (state.offeredCompressionMethods = new byte[1]);
            TlsUtilities.WriteUint8ArrayWithUint8Length(state.offeredCompressionMethods, (Stream)(object)val);
            if (state.clientExtensions != null)
            {
                TlsProtocol.WriteExtensions((Stream)(object)val, state.clientExtensions);
            }
            return(val.ToArray());
        }
Esempio n. 2
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        protected virtual byte[] GenerateClientHello(DtlsClientProtocol.ClientHandshakeState state, TlsClient client)
        {
            MemoryStream    memoryStream  = new MemoryStream();
            ProtocolVersion clientVersion = client.ClientVersion;

            if (!clientVersion.IsDtls)
            {
                throw new TlsFatalAlert(80);
            }
            TlsClientContextImpl clientContext = state.clientContext;

            clientContext.SetClientVersion(clientVersion);
            TlsUtilities.WriteVersion(clientVersion, memoryStream);
            SecurityParameters securityParameters = clientContext.SecurityParameters;

            memoryStream.Write(securityParameters.ClientRandom, 0, securityParameters.ClientRandom.Length);
            byte[] array = TlsUtilities.EmptyBytes;
            if (state.tlsSession != null)
            {
                array = state.tlsSession.SessionID;
                if (array == null || array.Length > 32)
                {
                    array = TlsUtilities.EmptyBytes;
                }
            }
            TlsUtilities.WriteOpaque8(array, memoryStream);
            TlsUtilities.WriteOpaque8(TlsUtilities.EmptyBytes, memoryStream);
            bool isFallback = client.IsFallback;

            state.offeredCipherSuites = client.GetCipherSuites();
            state.clientExtensions    = client.GetClientExtensions();
            byte[] extensionData = TlsUtilities.GetExtensionData(state.clientExtensions, 65281);
            bool   flag          = null == extensionData;
            bool   flag2         = !Arrays.Contains(state.offeredCipherSuites, 255);

            if (flag && flag2)
            {
                state.offeredCipherSuites = Arrays.Append(state.offeredCipherSuites, 255);
            }
            if (isFallback && !Arrays.Contains(state.offeredCipherSuites, 22016))
            {
                state.offeredCipherSuites = Arrays.Append(state.offeredCipherSuites, 22016);
            }
            TlsUtilities.WriteUint16ArrayWithUint16Length(state.offeredCipherSuites, memoryStream);
            byte[] offeredCompressionMethods = new byte[1];
            state.offeredCompressionMethods = offeredCompressionMethods;
            TlsUtilities.WriteUint8ArrayWithUint8Length(state.offeredCompressionMethods, memoryStream);
            if (state.clientExtensions != null)
            {
                TlsProtocol.WriteExtensions(memoryStream, state.clientExtensions);
            }
            return(memoryStream.ToArray());
        }
Esempio n. 3
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        protected virtual byte[] GenerateClientHello(ClientHandshakeState state, TlsClient client)
        {
            MemoryStream buf = new MemoryStream();

            ProtocolVersion client_version = client.ClientVersion;

            if (!client_version.IsDtls)
            {
                throw new TlsFatalAlert(AlertDescription.internal_error);
            }

            TlsClientContextImpl context = state.clientContext;

            context.SetClientVersion(client_version);
            TlsUtilities.WriteVersion(client_version, buf);

            SecurityParameters securityParameters = context.SecurityParameters;

            buf.Write(securityParameters.ClientRandom, 0, securityParameters.ClientRandom.Length);

            // Session ID
            byte[] session_id = TlsUtilities.EmptyBytes;
            if (state.tlsSession != null)
            {
                session_id = state.tlsSession.SessionID;
                if (session_id == null || session_id.Length > 32)
                {
                    session_id = TlsUtilities.EmptyBytes;
                }
            }
            TlsUtilities.WriteOpaque8(session_id, buf);

            // Cookie
            TlsUtilities.WriteOpaque8(TlsUtilities.EmptyBytes, buf);

            bool fallback = client.IsFallback;

            /*
             * Cipher suites
             */
            state.offeredCipherSuites = client.GetCipherSuites();

            // Integer -> byte[]
            state.clientExtensions = client.GetClientExtensions();

            securityParameters.extendedMasterSecret = TlsExtensionsUtilities.HasExtendedMasterSecretExtension(state.clientExtensions);

            // Cipher Suites (and SCSV)
            {
                /*
                 * RFC 5746 3.4. The client MUST include either an empty "renegotiation_info" extension,
                 * or the TLS_EMPTY_RENEGOTIATION_INFO_SCSV signaling cipher suite value in the
                 * ClientHello. Including both is NOT RECOMMENDED.
                 */
                byte[] renegExtData = TlsUtilities.GetExtensionData(state.clientExtensions, ExtensionType.renegotiation_info);
                bool   noRenegExt   = (null == renegExtData);

                bool noRenegSCSV = !Arrays.Contains(state.offeredCipherSuites, CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV);

                if (noRenegExt && noRenegSCSV)
                {
                    // TODO Consider whether to default to a client extension instead
                    state.offeredCipherSuites = Arrays.Append(state.offeredCipherSuites, CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV);
                }

                /*
                 * draft-ietf-tls-downgrade-scsv-00 4. If a client sends a ClientHello.client_version
                 * containing a lower value than the latest (highest-valued) version supported by the
                 * client, it SHOULD include the TLS_FALLBACK_SCSV cipher suite value in
                 * ClientHello.cipher_suites.
                 */
                if (fallback && !Arrays.Contains(state.offeredCipherSuites, CipherSuite.TLS_FALLBACK_SCSV))
                {
                    state.offeredCipherSuites = Arrays.Append(state.offeredCipherSuites, CipherSuite.TLS_FALLBACK_SCSV);
                }

                TlsUtilities.WriteUint16ArrayWithUint16Length(state.offeredCipherSuites, buf);
            }

            // TODO Add support for compression
            // Compression methods
            // state.offeredCompressionMethods = client.getCompressionMethods();
            state.offeredCompressionMethods = new byte[] { CompressionMethod.cls_null };

            TlsUtilities.WriteUint8ArrayWithUint8Length(state.offeredCompressionMethods, buf);

            // Extensions
            if (state.clientExtensions != null)
            {
                TlsProtocol.WriteExtensions(buf, state.clientExtensions);
            }

            return(buf.ToArray());
        }
Esempio n. 4
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        protected virtual byte[] GenerateClientHello(ClientHandshakeState state, TlsClient client)
        {
            ProtocolVersion client_version = client.ClientVersion;

            if (!client_version.IsDtls)
            {
                throw new TlsFatalAlert(AlertDescription.internal_error);
            }

            TlsClientContextImpl context = state.clientContext;

            context.SetClientVersion(client_version);

            SecurityParameters securityParameters = context.SecurityParameters;

            // Session ID
            byte[] session_id = TlsUtilities.EmptyBytes;
            if (state.tlsSession != null)
            {
                session_id = state.tlsSession.SessionID;
                if (session_id == null || session_id.Length > 32)
                {
                    session_id = TlsUtilities.EmptyBytes;
                }
            }

            bool fallback = client.IsFallback;

            state.offeredCipherSuites = client.GetCipherSuites();

            if (session_id.Length > 0 && state.sessionParameters != null)
            {
                if (!state.sessionParameters.IsExtendedMasterSecret ||
                    !Arrays.Contains(state.offeredCipherSuites, state.sessionParameters.CipherSuite) ||
                    CompressionMethod.cls_null != state.sessionParameters.CompressionAlgorithm)
                {
                    session_id = TlsUtilities.EmptyBytes;
                }
            }

            state.clientExtensions = TlsExtensionsUtilities.EnsureExtensionsInitialised(client.GetClientExtensions());

            TlsExtensionsUtilities.AddExtendedMasterSecretExtension(state.clientExtensions);

            MemoryStream buf = new MemoryStream();

            TlsUtilities.WriteVersion(client_version, buf);

            buf.Write(securityParameters.ClientRandom, 0, securityParameters.ClientRandom.Length);

            TlsUtilities.WriteOpaque8(session_id, buf);

            // Cookie
            TlsUtilities.WriteOpaque8(TlsUtilities.EmptyBytes, buf);

            // Cipher Suites (and SCSV)
            {
                /*
                 * RFC 5746 3.4. The client MUST include either an empty "renegotiation_info" extension,
                 * or the TLS_EMPTY_RENEGOTIATION_INFO_SCSV signaling cipher suite value in the
                 * ClientHello. Including both is NOT RECOMMENDED.
                 */
                byte[] renegExtData = TlsUtilities.GetExtensionData(state.clientExtensions, ExtensionType.renegotiation_info);
                bool   noRenegExt   = (null == renegExtData);

                bool noRenegSCSV = !Arrays.Contains(state.offeredCipherSuites, CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV);

                if (noRenegExt && noRenegSCSV)
                {
                    // TODO Consider whether to default to a client extension instead
                    state.offeredCipherSuites = Arrays.Append(state.offeredCipherSuites, CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV);
                }

                /*
                 * RFC 7507 4. If a client sends a ClientHello.client_version containing a lower value
                 * than the latest (highest-valued) version supported by the client, it SHOULD include
                 * the TLS_FALLBACK_SCSV cipher suite value in ClientHello.cipher_suites [..]. (The
                 * client SHOULD put TLS_FALLBACK_SCSV after all cipher suites that it actually intends
                 * to negotiate.)
                 */
                if (fallback && !Arrays.Contains(state.offeredCipherSuites, CipherSuite.TLS_FALLBACK_SCSV))
                {
                    state.offeredCipherSuites = Arrays.Append(state.offeredCipherSuites, CipherSuite.TLS_FALLBACK_SCSV);
                }

                TlsUtilities.WriteUint16ArrayWithUint16Length(state.offeredCipherSuites, buf);
            }

            TlsUtilities.WriteUint8ArrayWithUint8Length(new byte[] { CompressionMethod.cls_null }, buf);

            TlsProtocol.WriteExtensions(buf, state.clientExtensions);

            return(buf.ToArray());
        }