/// <summary>
/// Creates a session with the server that is independent of the network connection.
/// </summary>
public CreateSessionResponseMessage CreateSession(CreateSessionMessage request)
{
try
{
lock (m_lock)
{
InitializeApplicationDescription();
// create a new session object.
Session session = new Session();
NodeId sessionId;
NodeId authenticationToken;
byte[] serverNonce;
double revisedSessionTimeout;
EndpointDescription endpoint = m_endpoints[0];
// the session object validates the incoming parameters and produces faults on error.
session.Create(
endpoint,
request.ClientDescription,
request.ClientCertificate,
request.SessionName,
request.RequestedSessionTimeout,
out sessionId,
out authenticationToken,
out serverNonce,
out revisedSessionTimeout);
// save the session.
m_sessions.Add(authenticationToken.Identifier, session);
// the server application must authenticate itself to the client by providing a signature.
// this process is redundant for applications using WS-SecureConversation with mutual certificate
// exchange, however, the UA specification requires this step to ensure that secure channel
// technologies such as machine-to-machine VPNs can be used instead without sacrificing the
// ability to identify the remote applications.
byte[] dataToSign = SecurityUtils.Append(request.ClientCertificate, request.ClientNonce);
SignatureData serverSignature = SecurityUtils.Sign(
m_serverCertificate,
endpoint.SecurityPolicyUri,
dataToSign);
// contruct the response.
CreateSessionResponseMessage response = new CreateSessionResponseMessage();
response.ResponseHeader = CreateResponseHeader(request.RequestHeader);
response.SessionId = sessionId;
response.AuthenticationToken = authenticationToken;
response.MaxRequestMessageSize = request.MaxResponseMessageSize;
response.RevisedSessionTimeout = revisedSessionTimeout;
response.ServerNonce = serverNonce;
response.ServerCertificate = m_serverCertificate.GetRawCertData();
response.ServerSignature = serverSignature;
response.ServerEndpoints = m_endpoints;
response.ServerSoftwareCertificates = new ListOfSignedSoftwareCertificate();
return(response);
}
}
catch (Exception e)
{
throw CreateSoapFault(request.RequestHeader, e);
}
}
/// <summary>
/// Creates a session with the server.
/// </summary>
public void CreateSession()
{
ApplicationDescription description = new ApplicationDescription();
description.ApplicationName = new LocalizedText("UA Sample Client");
description.ApplicationType = ApplicationType.Client_1;
description.ApplicationUri = "http://localhost/UASampleClient";
byte[] serverCertificateData;
ListOfEndpointDescription serverEndpoints;
ListOfSignedSoftwareCertificate serverSoftwareCertificates;
SignatureData serverSignature;
// create a client nonce.
byte[] clientNonce = new byte[32];
RNGCryptoServiceProvider random = new RNGCryptoServiceProvider();
random.GetBytes(clientNonce);
string endpointUrl = this.Endpoint.Address.Uri.ToString();
// create the session.
CreateSession(
CreateRequestHeader(),
description,
null,
this.Endpoint.Address.Uri.ToString(),
"My Session",
clientNonce,
m_clientCertificate.RawData,
600000,
0,
out m_sessionId,
out m_authenticationToken,
out m_sessionTimeout,
out m_serverNonce,
out serverCertificateData,
out serverEndpoints,
out serverSoftwareCertificates,
out serverSignature,
out m_maxRequestMessageSize);
// find the endpoint description being used.
string securityPolicyUri = "";
Uri url = new Uri(endpointUrl);
foreach (EndpointDescription serverEndpoint in serverEndpoints)
{
Uri url2 = new Uri(serverEndpoint.EndpointUrl);
if (url2.Scheme == url.Scheme && url2.Port == url.Port && url2.PathAndQuery == url.PathAndQuery)
{
securityPolicyUri = serverEndpoint.SecurityPolicyUri;
break;
}
}
// validate the server's signature.
byte[] dataToSign = SecurityUtils.Append(m_clientCertificate.RawData, clientNonce);
bool valid = SecurityUtils.Verify(
new X509Certificate2(serverCertificateData),
securityPolicyUri,
dataToSign,
serverSignature);
if (!valid)
{
throw new StatusCodeException(
StatusCodes.BadSecurityChecksFailed,
"Server did not provide a correct signature for the nonce data provided by the client.");
}
// create the client signature.
dataToSign = SecurityUtils.Append(serverCertificateData, m_serverNonce);
SignatureData clientSignature = SecurityUtils.Sign(
m_clientCertificate,
securityPolicyUri,
dataToSign);
// use an anonymous user identity token.
ExtensionObject userIdentityToken = new ExtensionObject(
new ExpandedNodeId(Objects.AnonymousIdentityToken_Encoding_DefaultXml),
new AnonymousIdentityToken());
ListOfStatusCode results;
ListOfDiagnosticInfo diagnosticInfos;
// activate the session.
ActivateSession(
CreateRequestHeader(),
clientSignature,
new ListOfSignedSoftwareCertificate(),
new ListOfString(),
null,
null,
out m_serverNonce,
out results,
out diagnosticInfos);
}