/// <summary>
/// Begins processing an incoming request.
/// </summary>
/// <param name="context">The security context for the request</param>
/// <param name="requestData">The request data.</param>
/// <returns>
/// The result object that is used to call the EndProcessRequest method.
/// </returns>
public IAsyncResult BeginProcessRequest(
SecureChannelContext context,
byte[] requestData)
{
m_context = context;
try
{
// decoding incoming message.
m_request = BinaryDecoder.DecodeMessage(requestData, null, m_endpoint.MessageContext) as IServiceRequest;
// find service.
m_service = m_endpoint.FindService(m_request.TypeId);
if (m_service == null)
{
throw ServiceResultException.Create(StatusCodes.BadServiceUnsupported, "'{0}' is an unrecognized service type.", m_request.TypeId);
}
// queue request.
m_endpoint.ServerForContext.ScheduleIncomingRequest(this);
}
catch (Exception e)
{
m_error = e;
m_response = SaveExceptionAsResponse(e);
// operation completed.
OperationCompleted();
}
return(this);
}
public IServiceResponse EndSendRequest(IAsyncResult result)
{
AsyncResult result2 = result as AsyncResult;
if (result2 == null)
{
throw new ArgumentException("Invalid result object passed.", nameof(result));
}
try
{
result2.WaitForComplete();
if (result2.Response != null)
{
Stream responseContent = result2.Response.Content.ReadAsStreamAsync().Result;
return(BinaryDecoder.DecodeMessage(responseContent, null, m_quotas.MessageContext) as IServiceResponse);
}
}
catch (Exception ex)
{
Utils.Trace("Exception reading HTTPS response: " + ex.Message);
result2.Exception = ex;
}
return(result2 as IServiceResponse);
}
/// <summary>
/// Sends a request over the secure channel.
/// </summary>
public IServiceResponse SendRequest(IServiceRequest request)
{
if (m_wcfBypassChannel != null)
{
return(m_wcfBypassChannel.SendRequest(request));
}
byte[] requestMessage = BinaryEncoder.EncodeMessage(request, m_messageContext);
InvokeServiceResponseMessage responseMessage = InvokeService(new InvokeServiceMessage(requestMessage));
return((IServiceResponse)BinaryDecoder.DecodeMessage(responseMessage.InvokeServiceResponse, null, m_messageContext));
}
/// <summary>
/// Completes an asynchronous operation to send a request over the secure channel.
/// </summary>
public IServiceResponse EndSendRequest(IAsyncResult result)
{
AsyncResult result2 = result as AsyncResult;
if (result2 == null)
{
throw new ArgumentException("Invalid result object passed.", "result");
}
result2.WaitForComplete();
HttpWebResponse response = (HttpWebResponse)result2.WebRequest.EndGetResponse(result2.InnerResult);
Stream istrm = response.GetResponseStream();
MemoryStream mstrm = new MemoryStream();
int bytesRead = 0;
byte[] buffer = new byte[4096];
do
{
bytesRead = istrm.Read(buffer, 0, buffer.Length);
mstrm.Write(buffer, 0, bytesRead);
} while (bytesRead != 0);
mstrm.Position = 0;
istrm.Close();
IEncodeable message = null;
if (m_settings.Configuration.UseBinaryEncoding)
{
message = BinaryDecoder.DecodeMessage(mstrm, null, this.MessageContext);
}
else
{
string responseType = result2.Request.GetType().FullName.Replace("Request", "Response");
message = ReadSoapMessage(
mstrm,
responseType.Substring("Opc.Ua.".Length),
Type.GetType(responseType),
this.MessageContext);
}
istrm.Close();
return(message as IServiceResponse);
}
/// <summary>
/// Completes an asynchronous operation to send a request over the secure channel.
/// </summary>
public IServiceResponse EndSendRequest(IAsyncResult result)
{
if (m_wcfBypassChannel != null)
{
return(m_wcfBypassChannel.EndSendRequest(result));
}
#if MANAGE_CHANNEL_THREADS
return(SendRequestAsyncResult.WaitForComplete(result));
#else
InvokeServiceResponseMessage responseMessage = EndInvokeService(result);
return((IServiceResponse)BinaryDecoder.DecodeMessage(responseMessage.InvokeServiceResponse, null, m_messageContext));
#endif
}
/// <summary>
/// Completes the _NAME_ service.
/// </summary>
public _NAME_Response End_NAME_(IAsyncResult result)
{
InvokeServiceResponseMessage response = null;
try
{
response = Channel.EndInvokeService(result);
}
catch (FaultException <ServiceFault> e)
{
throw HandleSoapFault(e);
}
CheckForFault(response);
return((_NAME_Response)BinaryDecoder.DecodeMessage(response.InvokeServiceResponse, typeof(_NAME_Response), CreateContext()));
}
/// <summary>
/// Dispatches an incoming binary encoded request.
/// </summary>
/// <param name="request">Request.</param>
/// <returns>Invoke service response message.</returns>
public virtual InvokeServiceResponseMessage InvokeService(InvokeServiceMessage request)
{
IServiceRequest decodedRequest = null;
IServiceResponse response = null;
// create context for request and reply.
ServiceMessageContext context = MessageContext;
try
{
// check for null.
if (request == null || request.InvokeServiceRequest == null)
{
throw new ServiceResultException(StatusCodes.BadDecodingError, Utils.Format("Null message cannot be processed."));
}
// decoding incoming message.
decodedRequest =
BinaryDecoder.DecodeMessage(request.InvokeServiceRequest, null, context) as IServiceRequest;
// invoke service.
response = ProcessRequest(decodedRequest);
// encode response.
InvokeServiceResponseMessage outgoing = new InvokeServiceResponseMessage();
outgoing.InvokeServiceResponse = BinaryEncoder.EncodeMessage(response, context);
return(outgoing);
}
catch (Exception e)
{
// create fault.
ServiceFault fault = CreateFault(decodedRequest, e);
// encode fault response.
if (context == null)
{
context = new ServiceMessageContext();
}
InvokeServiceResponseMessage outgoing = new InvokeServiceResponseMessage();
outgoing.InvokeServiceResponse = BinaryEncoder.EncodeMessage(fault, context);
return(outgoing);
}
}
/// <inheritdoc/>
public async Task <IServiceResponse> SendRequestAsync(IServiceRequest request, CancellationToken ct)
{
try
{
ByteArrayContent content = new ByteArrayContent(BinaryEncoder.EncodeMessage(request, m_quotas.MessageContext));
content.Headers.ContentType = m_mediaTypeHeaderValue;
var result = await m_client.PostAsync(m_url, content, ct);
result.EnsureSuccessStatusCode();
Stream responseContent = await result.Content.ReadAsStreamAsync();
return(BinaryDecoder.DecodeMessage(responseContent, null, m_quotas.MessageContext) as IServiceResponse);
}
catch (Exception ex)
{
Utils.Trace("Exception sending HTTPS request: " + ex.Message);
throw;
}
}
static TestStackRequest Decode(byte[] message, ServiceMessageContext context1, bool binary)
{
if (binary)
{
return((TestStackRequest)BinaryDecoder.DecodeMessage(message, null, context1));
}
else
{
ServiceMessageContext.ThreadContext = context1;
MemoryStream istrm = new MemoryStream(message);
XmlReaderSettings settings = new XmlReaderSettings();
using (XmlReader reader = XmlReader.Create(istrm, settings))
{
DataContractSerializer serializer = new DataContractSerializer(typeof(TestStackRequest));
return((TestStackRequest)serializer.ReadObject(reader));
}
}
}
// ***START***
#if (!OPCUA_EXCLUDE__NAME_)
/// <summary>
/// Invokes the _NAME_ service.
/// </summary>
public _NAME_Response _NAME_(_NAME_Request request)
{
BinaryMessageContext context = CreateContext();
byte[] buffer = BinaryEncoder.EncodeMessage(request, context);
InvokeServiceResponseMessage response = null;
try
{
response = Channel.InvokeService(new InvokeServiceMessage(buffer));
}
catch (FaultException <ServiceFault> e)
{
throw HandleSoapFault(e);
}
CheckForFault(response);
return((_NAME_Response)BinaryDecoder.DecodeMessage(response.InvokeServiceResponse, typeof(_NAME_Response), context));
}
/// <summary>
/// Handles requests arriving from a channel.
/// </summary>
public async void SendAsync(HttpContext context)
{
IAsyncResult result = null;
try
{
if (m_callback == null)
{
context.Response.ContentLength = 0;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.NotImplemented;
await context.Response.WriteAsync(string.Empty);
return;
}
byte[] buffer = new byte[(int)context.Request.ContentLength];
lock (m_lock)
{
Task <int> task = context.Request.Body.ReadAsync(buffer, 0, (int)context.Request.ContentLength);
task.Wait();
}
IServiceRequest input = (IServiceRequest)BinaryDecoder.DecodeMessage(buffer, null, m_quotas.MessageContext);
// extract the JWT token from the HTTP headers.
if (input.RequestHeader == null)
{
input.RequestHeader = new RequestHeader();
}
if (NodeId.IsNull(input.RequestHeader.AuthenticationToken) && input.TypeId != DataTypeIds.CreateSessionRequest)
{
if (context.Request.Headers.Keys.Contains("Authorization"))
{
foreach (string value in context.Request.Headers["Authorization"])
{
if (value.StartsWith("Bearer"))
{
input.RequestHeader.AuthenticationToken = new NodeId(value.Substring("Bearer ".Length).Trim());
}
}
}
}
EndpointDescription endpoint = null;
foreach (var ep in m_descriptions)
{
if (ep.EndpointUrl.StartsWith(Utils.UriSchemeHttps))
{
endpoint = ep;
break;
}
}
result = m_callback.BeginProcessRequest(
m_listenerId,
endpoint,
input as IServiceRequest,
null,
null);
IServiceResponse output = m_callback.EndProcessRequest(result);
byte[] response = BinaryEncoder.EncodeMessage(output, m_quotas.MessageContext);
context.Response.ContentLength = response.Length;
context.Response.ContentType = context.Request.ContentType;
context.Response.StatusCode = (int)HttpStatusCode.OK;
await context.Response.Body.WriteAsync(response, 0, response.Length);
}
catch (Exception e)
{
Utils.Trace(e, "HTTPSLISTENER - Unexpected error processing request.");
context.Response.ContentLength = e.Message.Length;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
await context.Response.WriteAsync(e.Message);
}
}
/// <summary>
/// Handles requests arriving from a channel.
/// </summary>
private IAsyncResult BeginProcessRequest(Stream istrm, string action, string securityPolicyUri, object callbackData)
{
IAsyncResult result = null;
try
{
if (m_callback != null)
{
string contentType = WebOperationContext.Current.IncomingRequest.ContentType;
Uri uri = WebOperationContext.Current.IncomingRequest.UriTemplateMatch.RequestUri;
string scheme = uri.Scheme + ":";
EndpointDescription endpoint = null;
for (int ii = 0; ii < m_descriptions.Count; ii++)
{
if (m_descriptions[ii].EndpointUrl.StartsWith(scheme))
{
if (endpoint == null)
{
endpoint = m_descriptions[ii];
}
if (m_descriptions[ii].SecurityPolicyUri == securityPolicyUri)
{
endpoint = m_descriptions[ii];
break;
}
}
}
IEncodeable request = null;
if (String.IsNullOrEmpty(action))
{
request = BinaryDecoder.DecodeMessage(istrm, null, this.m_quotas.MessageContext);
}
else
{
string requestType = "Opc.Ua." + action + "Request";
request = HttpsTransportChannel.ReadSoapMessage(
istrm,
action + "Request",
Type.GetType(requestType),
this.m_quotas.MessageContext);
}
result = m_callback.BeginProcessRequest(
m_listenerId,
endpoint,
request as IServiceRequest,
null,
callbackData);
}
}
catch (Exception e)
{
Utils.Trace(e, "HTTPSLISTENER - Unexpected error processing request.");
}
return(result);
}
/// <summary>
/// Handles requests arriving from a channel.
/// </summary>
public async Task SendAsync(HttpContext context)
{
IAsyncResult result = null;
try
{
if (m_callback == null)
{
context.Response.ContentLength = 0;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.NotImplemented;
await context.Response.WriteAsync(string.Empty);
return;
}
if (context.Request.ContentType != "application/octet-stream")
{
context.Response.ContentLength = 0;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
await context.Response.WriteAsync("HTTPSLISTENER - Unsupported content type.");
return;
}
int length = (int)context.Request.ContentLength;
byte[] buffer = await ReadBodyAsync(context.Request);
if (buffer.Length != length)
{
context.Response.ContentLength = 0;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
await context.Response.WriteAsync("HTTPSLISTENER - Couldn't decode buffer.");
return;
}
IServiceRequest input = (IServiceRequest)BinaryDecoder.DecodeMessage(buffer, null, m_quotas.MessageContext);
// extract the JWT token from the HTTP headers.
if (input.RequestHeader == null)
{
input.RequestHeader = new RequestHeader();
}
if (NodeId.IsNull(input.RequestHeader.AuthenticationToken) && input.TypeId != DataTypeIds.CreateSessionRequest)
{
if (context.Request.Headers.Keys.Contains("Authorization"))
{
foreach (string value in context.Request.Headers["Authorization"])
{
if (value.StartsWith("Bearer"))
{
input.RequestHeader.AuthenticationToken = new NodeId(value.Substring("Bearer ".Length).Trim());
}
}
}
}
EndpointDescription endpoint = null;
foreach (var ep in m_descriptions)
{
if (ep.EndpointUrl.StartsWith(Utils.UriSchemeHttps))
{
endpoint = ep;
break;
}
}
IPAddress remoteIP = (context.Connection == null ? null : context.Connection.RemoteIpAddress);
int remotePort = (context.Connection == null ? 0 : context.Connection.RemotePort);
result = m_callback.BeginProcessRequest(
m_listenerId,
endpoint,
input as IServiceRequest,
null,
null,
remoteIP, // HONEYPOT - pass the remote IP address as an additional parameter.
remotePort); // HONEYPOT - pass the remote port as an additional parameter.
IServiceResponse output = m_callback.EndProcessRequest(result);
byte[] response = BinaryEncoder.EncodeMessage(output, m_quotas.MessageContext);
context.Response.ContentLength = response.Length;
context.Response.ContentType = context.Request.ContentType;
context.Response.StatusCode = (int)HttpStatusCode.OK;
await context.Response.Body.WriteAsync(response, 0, response.Length);
}
catch (Exception e)
{
Utils.Trace(e, "HTTPSLISTENER - Unexpected error processing request.");
context.Response.ContentLength = e.Message.Length;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
await context.Response.WriteAsync(e.Message);
}
}
/// <summary>
/// Handles requests arriving from a channel.
/// </summary>
public async Task SendAsync(HttpContext context)
{
string message = string.Empty;
CancellationToken ct = context.RequestAborted;
try
{
if (m_callback == null)
{
await WriteResponseAsync(context.Response, message, HttpStatusCode.NotImplemented).ConfigureAwait(false);
return;
}
if (context.Request.ContentType != kApplicationContentType)
{
message = "HTTPSLISTENER - Unsupported content type.";
await WriteResponseAsync(context.Response, message, HttpStatusCode.BadRequest).ConfigureAwait(false);
return;
}
int length = (int)context.Request.ContentLength;
byte[] buffer = await ReadBodyAsync(context.Request).ConfigureAwait(false);
if (buffer.Length != length)
{
message = "HTTPSLISTENER - Invalid buffer.";
await WriteResponseAsync(context.Response, message, HttpStatusCode.BadRequest).ConfigureAwait(false);
return;
}
IServiceRequest input = (IServiceRequest)BinaryDecoder.DecodeMessage(buffer, null, m_quotas.MessageContext);
// extract the JWT token from the HTTP headers.
if (input.RequestHeader == null)
{
input.RequestHeader = new RequestHeader();
}
if (NodeId.IsNull(input.RequestHeader.AuthenticationToken) &&
input.TypeId != DataTypeIds.CreateSessionRequest)
{
if (context.Request.Headers.ContainsKey(kAuthorizationKey))
{
foreach (string value in context.Request.Headers[kAuthorizationKey])
{
if (value.StartsWith(kBearerKey, StringComparison.OrdinalIgnoreCase))
{
// note: use NodeId(string, uint) to avoid the NodeId.Parse call.
input.RequestHeader.AuthenticationToken = new NodeId(value.Substring(kBearerKey.Length + 1).Trim(), 0);
}
}
}
}
if (!context.Request.Headers.TryGetValue(Profiles.HttpsSecurityPolicyHeader, out var header))
{
header = SecurityPolicies.None;
}
EndpointDescription endpoint = null;
foreach (var ep in m_descriptions)
{
if (ep.EndpointUrl.StartsWith(Utils.UriSchemeHttps, StringComparison.Ordinal))
{
if (!string.IsNullOrEmpty(header))
{
if (!string.Equals(ep.SecurityPolicyUri, header, StringComparison.Ordinal))
{
continue;
}
}
endpoint = ep;
break;
}
}
if (endpoint == null &&
input.TypeId != DataTypeIds.GetEndpointsRequest &&
input.TypeId != DataTypeIds.FindServersRequest)
{
message = "Connection refused, invalid security policy.";
Utils.LogError(message);
await WriteResponseAsync(context.Response, message, HttpStatusCode.Unauthorized).ConfigureAwait(false);
return;
}
// note: do not use Task.Factory.FromAsync here
var result = m_callback.BeginProcessRequest(
m_listenerId,
endpoint,
input as IServiceRequest,
null,
null);
IServiceResponse output = m_callback.EndProcessRequest(result);
byte[] response = BinaryEncoder.EncodeMessage(output, m_quotas.MessageContext);
context.Response.ContentLength = response.Length;
context.Response.ContentType = context.Request.ContentType;
context.Response.StatusCode = (int)HttpStatusCode.OK;
#if NETSTANDARD2_1 || NET5_0_OR_GREATER || NETCOREAPP3_1_OR_GREATER
await context.Response.Body.WriteAsync(response.AsMemory(0, response.Length), ct).ConfigureAwait(false);
#else
await context.Response.Body.WriteAsync(response, 0, response.Length, ct).ConfigureAwait(false);
#endif
return;
}
catch (Exception e)
{
message = "HTTPSLISTENER - Unexpected error processing request.";
Utils.LogError(e, message);
}
await WriteResponseAsync(context.Response, message, HttpStatusCode.InternalServerError).ConfigureAwait(false);
}
/// <summary>
/// Processes a request message.
/// </summary>
private bool ProcessRequestMessage(uint messageType, ArraySegment <byte> messageChunk)
{
// validate the channel state.
if (State != TcpChannelState.Open)
{
ForceChannelFault(StatusCodes.BadTcpMessageTypeInvalid, "Client sent an unexpected request message.");
return(false);
}
// validate security on the message.
ChannelToken token = null;
uint requestId = 0;
uint sequenceNumber = 0;
ArraySegment <byte> messageBody;
try
{
messageBody = ReadSymmetricMessage(messageChunk, true, out token, out requestId, out sequenceNumber);
// check for replay attacks.
if (!VerifySequenceNumber(sequenceNumber, "ProcessRequestMessage"))
{
throw new ServiceResultException(StatusCodes.BadSequenceNumberInvalid);
}
if (token == CurrentToken && PreviousToken != null && !PreviousToken.Expired)
{
Utils.Trace("Server Revoked Token. ChannelId={1}, TokenId={0}", PreviousToken.TokenId, PreviousToken.ChannelId, DateTime.UtcNow);
PreviousToken.Lifetime = 0;
}
}
catch (Exception e)
{
Utils.Trace("Could not verify security on incoming request.");
ForceChannelFault(e, StatusCodes.BadSecurityChecksFailed, "Could not verify security on incoming request.");
return(false);
}
BufferCollection chunksToProcess = null;
try
{
// check for an abort.
if (TcpMessageType.IsAbort(messageType))
{
Utils.Trace("Request was aborted.");
chunksToProcess = GetSavedChunks(requestId, messageBody);
return(true);
}
// check if it is necessary to wait for more chunks.
if (!TcpMessageType.IsFinal(messageType))
{
SaveIntermediateChunk(requestId, messageBody);
return(true);
}
Utils.Trace("Channel {0}: ProcessRequestMessage {1}", ChannelId, requestId);
// get the chunks to process.
chunksToProcess = GetSavedChunks(requestId, messageBody);
// decode the request.
IServiceRequest request = BinaryDecoder.DecodeMessage(new ArraySegmentStream(chunksToProcess), null, Quotas.MessageContext) as IServiceRequest;
if (request == null)
{
SendServiceFault(token, requestId, ServiceResult.Create(StatusCodes.BadStructureMissing, "Could not parse request body."));
return(true);
}
// ensure that only discovery requests come through unsecured.
if (DiscoveryOnly)
{
if (!(request is GetEndpointsRequest || request is FindServersRequest))
{
SendServiceFault(token, requestId, ServiceResult.Create(StatusCodes.BadSecurityPolicyRejected, "Channel can only be used for discovery."));
return(true);
}
}
// hand the request to the server.
RequestReceived?.Invoke(this, requestId, request);
return(true);
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error processing request.");
SendServiceFault(token, requestId, ServiceResult.Create(e, StatusCodes.BadTcpInternalError, "Unexpected error processing request."));
return(true);
}
finally
{
if (chunksToProcess != null)
{
chunksToProcess.Release(BufferManager, "ProcessRequestMessage");
}
}
}
/// <summary>
/// Processes an CloseSecureChannel request message.
/// </summary>
private bool ProcessCloseSecureChannelRequest(uint messageType, ArraySegment <byte> messageChunk)
{
// validate security on the message.
ChannelToken token = null;
uint requestId = 0;
uint sequenceNumber = 0;
ArraySegment <byte> messageBody;
try
{
messageBody = ReadSymmetricMessage(messageChunk, true, out token, out requestId, out sequenceNumber);
// check for replay attacks.
if (!VerifySequenceNumber(sequenceNumber, "ProcessCloseSecureChannelRequest"))
{
throw new ServiceResultException(StatusCodes.BadSequenceNumberInvalid);
}
}
catch (Exception e)
{
throw ServiceResultException.Create(StatusCodes.BadSecurityChecksFailed, e, "Could not verify security on CloseSecureChannel request.");
}
BufferCollection chunksToProcess = null;
try
{
// check if it is necessary to wait for more chunks.
if (!TcpMessageType.IsFinal(messageType))
{
SaveIntermediateChunk(requestId, messageBody);
return(false);
}
// get the chunks to process.
chunksToProcess = GetSavedChunks(requestId, messageBody);
CloseSecureChannelRequest request = BinaryDecoder.DecodeMessage(
new ArraySegmentStream(chunksToProcess),
typeof(CloseSecureChannelRequest),
Quotas.MessageContext) as CloseSecureChannelRequest;
if (request == null)
{
throw ServiceResultException.Create(StatusCodes.BadStructureMissing, "Could not parse CloseSecureChannel request body.");
}
// send the response.
// SendCloseSecureChannelResponse(requestId, token, request);
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error processing OpenSecureChannel request.");
}
finally
{
if (chunksToProcess != null)
{
chunksToProcess.Release(BufferManager, "ProcessCloseSecureChannelRequest");
}
Utils.Trace(
"{0} ProcessCloseSecureChannelRequest Socket={0:X8}, ChannelId={1}, TokenId={2}",
ChannelName,
(Socket != null) ? Socket.Handle : 0,
(CurrentToken != null) ? CurrentToken.ChannelId : 0,
(CurrentToken != null) ? CurrentToken.TokenId : 0);
// close the channel.
ChannelClosed();
}
// return false would double free the buffer
return(true);
}
/// <summary>
/// Processes an OpenSecureChannel request message.
/// </summary>
private bool ProcessOpenSecureChannelRequest(uint messageType, ArraySegment <byte> messageChunk)
{
// validate the channel state.
if (State != TcpChannelState.Opening && State != TcpChannelState.Open)
{
ForceChannelFault(StatusCodes.BadTcpMessageTypeInvalid, "Client sent an unexpected OpenSecureChannel message.");
return(false);
}
// parse the security header.
uint channelId = 0;
X509Certificate2 clientCertificate = null;
uint requestId = 0;
uint sequenceNumber = 0;
ArraySegment <byte> messageBody;
try
{
messageBody = ReadAsymmetricMessage(
messageChunk,
ServerCertificate,
out channelId,
out clientCertificate,
out requestId,
out sequenceNumber);
// check for replay attacks.
if (!VerifySequenceNumber(sequenceNumber, "ProcessOpenSecureChannelRequest"))
{
throw new ServiceResultException(StatusCodes.BadSequenceNumberInvalid);
}
}
catch (Exception e)
{
ServiceResultException innerException = e.InnerException as ServiceResultException;
// If the certificate structre, signature and trust list checks pass, we return the other specific validation errors instead of BadSecurityChecksFailed
if (innerException != null)
{
if (innerException.StatusCode == StatusCodes.BadCertificateUntrusted ||
innerException.StatusCode == StatusCodes.BadCertificateChainIncomplete ||
innerException.StatusCode == StatusCodes.BadCertificateRevoked ||
innerException.StatusCode == StatusCodes.BadCertificateInvalid ||
(innerException.InnerResult != null && innerException.InnerResult.StatusCode == StatusCodes.BadCertificateUntrusted))
{
ForceChannelFault(StatusCodes.BadSecurityChecksFailed, e.Message);
return(false);
}
else if (innerException.StatusCode == StatusCodes.BadCertificateTimeInvalid ||
innerException.StatusCode == StatusCodes.BadCertificateIssuerTimeInvalid ||
innerException.StatusCode == StatusCodes.BadCertificateHostNameInvalid ||
innerException.StatusCode == StatusCodes.BadCertificateUriInvalid ||
innerException.StatusCode == StatusCodes.BadCertificateUseNotAllowed ||
innerException.StatusCode == StatusCodes.BadCertificateIssuerUseNotAllowed ||
innerException.StatusCode == StatusCodes.BadCertificateRevocationUnknown ||
innerException.StatusCode == StatusCodes.BadCertificateIssuerRevocationUnknown ||
innerException.StatusCode == StatusCodes.BadCertificateIssuerRevoked)
{
ForceChannelFault(innerException, innerException.StatusCode, e.Message);
return(false);
}
}
ForceChannelFault(e, StatusCodes.BadSecurityChecksFailed, "Could not verify security on OpenSecureChannel request.");
return(false);
}
BufferCollection chunksToProcess = null;
try
{
bool firstCall = ClientCertificate == null;
// must ensure the same certificate was used.
if (ClientCertificate != null)
{
CompareCertificates(ClientCertificate, clientCertificate, false);
}
else
{
ClientCertificate = clientCertificate;
}
// check if it is necessary to wait for more chunks.
if (!TcpMessageType.IsFinal(messageType))
{
SaveIntermediateChunk(requestId, messageBody);
return(false);
}
// create a new token.
ChannelToken token = CreateToken();
token.TokenId = GetNewTokenId();
token.ServerNonce = CreateNonce();
// get the chunks to process.
chunksToProcess = GetSavedChunks(requestId, messageBody);
OpenSecureChannelRequest request = (OpenSecureChannelRequest)BinaryDecoder.DecodeMessage(
new ArraySegmentStream(chunksToProcess),
typeof(OpenSecureChannelRequest),
Quotas.MessageContext);
if (request == null)
{
throw ServiceResultException.Create(StatusCodes.BadStructureMissing, "Could not parse OpenSecureChannel request body.");
}
// check the security mode.
if (request.SecurityMode != SecurityMode)
{
ReviseSecurityMode(firstCall, request.SecurityMode);
}
// check the client nonce.
token.ClientNonce = request.ClientNonce;
if (!ValidateNonce(token.ClientNonce))
{
throw ServiceResultException.Create(StatusCodes.BadNonceInvalid, "Client nonce is not the correct length or not random enough.");
}
// choose the lifetime.
int lifetime = (int)request.RequestedLifetime;
if (lifetime < TcpMessageLimits.MinSecurityTokenLifeTime)
{
lifetime = TcpMessageLimits.MinSecurityTokenLifeTime;
}
if (lifetime > 0 && lifetime < token.Lifetime)
{
token.Lifetime = lifetime;
}
// check the request type.
SecurityTokenRequestType requestType = request.RequestType;
if (requestType == SecurityTokenRequestType.Issue && State != TcpChannelState.Opening)
{
throw ServiceResultException.Create(StatusCodes.BadRequestTypeInvalid, "Cannot request a new token for an open channel.");
}
if (requestType == SecurityTokenRequestType.Renew && State != TcpChannelState.Open)
{
// may be reconnecting to a dropped channel.
if (State == TcpChannelState.Opening)
{
// tell the listener to find the channel that can process the request.
Listener.ReconnectToExistingChannel(
Socket,
requestId,
sequenceNumber,
channelId,
ClientCertificate,
token,
request);
Utils.Trace(
"{0} ReconnectToExistingChannel Socket={0:X8}, ChannelId={1}, TokenId={2}",
ChannelName,
(Socket != null) ? Socket.Handle : 0,
(CurrentToken != null) ? CurrentToken.ChannelId : 0,
(CurrentToken != null) ? CurrentToken.TokenId : 0);
// close the channel.
ChannelClosed();
// nothing more to do.
return(false);
}
throw ServiceResultException.Create(StatusCodes.BadRequestTypeInvalid, "Cannot request to renew a token for a channel that has not been opened.");
}
// check the channel id.
if (requestType == SecurityTokenRequestType.Renew && channelId != ChannelId)
{
throw ServiceResultException.Create(StatusCodes.BadTcpSecureChannelUnknown, "Do not recognize the secure channel id provided.");
}
// log security information.
if (requestType == SecurityTokenRequestType.Issue)
{
Opc.Ua.Security.Audit.SecureChannelCreated(
m_ImplementationString,
Listener.EndpointUrl.ToString(),
Utils.Format("{0}", ChannelId),
EndpointDescription,
ClientCertificate,
ServerCertificate,
BinaryEncodingSupport.Required);
}
else
{
Opc.Ua.Security.Audit.SecureChannelRenewed(
m_ImplementationString,
Utils.Format("{0}", ChannelId));
}
if (requestType == SecurityTokenRequestType.Renew)
{
SetRenewedToken(token);
}
else
{
ActivateToken(token);
}
State = TcpChannelState.Open;
// send the response.
SendOpenSecureChannelResponse(requestId, token, request);
// notify reverse
CompleteReverseHello(null);
// notify any monitors.
NotifyMonitors(ServiceResult.Good, false);
return(false);
}
catch (Exception e)
{
SendServiceFault(requestId, ServiceResult.Create(e, StatusCodes.BadTcpInternalError, "Unexpected error processing OpenSecureChannel request."));
CompleteReverseHello(e);
return(false);
}
finally
{
if (chunksToProcess != null)
{
chunksToProcess.Release(BufferManager, "ProcessOpenSecureChannelRequest");
}
}
}
/// <summary>
/// Handles requests arriving from a channel.
/// </summary>
public async Task SendAsync(HttpContext context)
{
IAsyncResult result = null;
try
{
if (m_callback == null)
{
context.Response.ContentLength = 0;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.NotImplemented;
await context.Response.WriteAsync(string.Empty).ConfigureAwait(false);
return;
}
if (context.Request.ContentType != "application/octet-stream")
{
context.Response.ContentLength = 0;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
await context.Response.WriteAsync("HTTPSLISTENER - Unsupported content type.").ConfigureAwait(false);
return;
}
int length = (int)context.Request.ContentLength;
byte[] buffer = await ReadBodyAsync(context.Request).ConfigureAwait(false);
if (buffer.Length != length)
{
context.Response.ContentLength = 0;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
await context.Response.WriteAsync("HTTPSLISTENER - Couldn't decode buffer.").ConfigureAwait(false);
return;
}
IServiceRequest input = (IServiceRequest)BinaryDecoder.DecodeMessage(buffer, null, m_quotas.MessageContext);
// extract the JWT token from the HTTP headers.
if (input.RequestHeader == null)
{
input.RequestHeader = new RequestHeader();
}
if (NodeId.IsNull(input.RequestHeader.AuthenticationToken) && input.TypeId != DataTypeIds.CreateSessionRequest)
{
if (context.Request.Headers.ContainsKey("Authorization"))
{
foreach (string value in context.Request.Headers["Authorization"])
{
if (value.StartsWith("Bearer", StringComparison.OrdinalIgnoreCase))
{
// note: use NodeId(string, uint) to avoid the NodeId.Parse call.
input.RequestHeader.AuthenticationToken = new NodeId(value.Substring("Bearer ".Length).Trim(), 0);
}
}
}
}
if (!context.Request.Headers.TryGetValue("OPCUA-SecurityPolicy", out var header))
{
header = SecurityPolicies.None;
}
EndpointDescription endpoint = null;
foreach (var ep in m_descriptions)
{
if (ep.EndpointUrl.StartsWith(Utils.UriSchemeHttps, StringComparison.Ordinal))
{
if (!string.IsNullOrEmpty(header))
{
if (!string.Equals(ep.SecurityPolicyUri, header, StringComparison.Ordinal))
{
continue;
}
}
endpoint = ep;
break;
}
}
if (endpoint == null &&
input.TypeId != DataTypeIds.GetEndpointsRequest &&
input.TypeId != DataTypeIds.FindServersRequest)
{
var message = "Connection refused, invalid security policy.";
Utils.LogError(message);
context.Response.ContentLength = message.Length;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
await context.Response.WriteAsync(message).ConfigureAwait(false);
}
result = m_callback.BeginProcessRequest(
m_listenerId,
endpoint,
input as IServiceRequest,
null,
null);
IServiceResponse output = m_callback.EndProcessRequest(result);
byte[] response = BinaryEncoder.EncodeMessage(output, m_quotas.MessageContext);
context.Response.ContentLength = response.Length;
context.Response.ContentType = context.Request.ContentType;
context.Response.StatusCode = (int)HttpStatusCode.OK;
#if NETSTANDARD2_1 || NET5_0_OR_GREATER || NETCOREAPP3_1_OR_GREATER
await context.Response.Body.WriteAsync(response.AsMemory(0, response.Length)).ConfigureAwait(false);
#else
await context.Response.Body.WriteAsync(response, 0, response.Length).ConfigureAwait(false);
#endif
}
catch (Exception e)
{
Utils.LogError(e, "HTTPSLISTENER - Unexpected error processing request.");
context.Response.ContentLength = e.Message.Length;
context.Response.ContentType = "text/plain";
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
await context.Response.WriteAsync(e.Message).ConfigureAwait(false);
}
}
/// <summary cref="IClientMessageInspector.AfterReceiveReply" />
public void AfterReceiveReply(ref System.ServiceModel.Channels.Message reply, object correlationState)
{
// check for fault.
if (reply.IsFault)
{
return;
}
// parse request parameters.
object[] parameters = correlationState as object[];
if (parameters == null || parameters.Length != 3)
{
throw new InvalidOperationException("Cannot decode request because the IClientMessageInspector not configured properly.");
}
// extract request parameters.
MessageVersion messageVersion = parameters[0] as MessageVersion;
string action = parameters[1] as string;
IServiceMessage request = parameters[2] as IServiceMessage;
object encodeable = null;
if (!reply.Properties.TryGetValue(MessageProperties.UnencodedBody, out encodeable))
{
// extract binary encoded response from body.
XmlDictionaryReader reader = reply.GetReaderAtBodyContents();
reader.MoveToStartElement("InvokeServiceResponse", Namespaces.OpcUaXsd);
byte[] response = reader.ReadElementContentAsBase64();
// decode body.
try
{
encodeable = BinaryDecoder.DecodeMessage(response, null, m_messageContext);
}
catch (Exception e)
{
ServiceResult error = ServiceResult.Create(
e,
StatusCodes.BadDecodingError,
"Could not decoding incoming response message.");
ServiceFault fault = new ServiceFault();
fault.ResponseHeader.RequestHandle = request.GetRequest().RequestHeader.RequestHandle;
fault.ResponseHeader.Timestamp = DateTime.UtcNow;
fault.ResponseHeader.ServiceResult = error.Code;
StringTable stringTable = new StringTable();
fault.ResponseHeader.ServiceDiagnostics = new DiagnosticInfo(
error,
DiagnosticsMasks.NoInnerStatus,
true,
stringTable);
fault.ResponseHeader.StringTable = stringTable.ToArray();
encodeable = fault;
}
}
object unencodedBody = request.CreateResponse((IServiceResponse)encodeable);
// create the unencoded reply message.
Message unencodedReply = Message.CreateMessage(
messageVersion,
action + "Response",
unencodedBody);
unencodedReply.Headers.MessageId = reply.Headers.MessageId;
unencodedReply.Headers.RelatesTo = reply.Headers.RelatesTo;
unencodedReply.Properties.Add(MessageProperties.UnencodedBody, unencodedBody);
// replace the incoming message.
reply = unencodedReply;
}