private void HandleRequest(HttpContext context)
{
Trace.TraceMethodCalled(GetType(), "HandleRequest()");
//Fetch the endpoint configuration
IDPEndPoint idpEndpoint = RetrieveIDPConfiguration(context.Session[IDPLoginSessionKey].ToString());
IDPEndPointElement destination =
DetermineEndpointConfiguration(SAMLBinding.REDIRECT, idpEndpoint.SLOEndpoint, idpEndpoint.metadata.SLOEndpoints());
//Fetch config object
SAML20FederationConfig config = ConfigurationReader.GetConfig<SAML20FederationConfig>();
//Build the response object
Saml20LogoutResponse response = new Saml20LogoutResponse();
response.Issuer = config.ServiceProvider.ID;
response.Destination = destination.Url;
response.StatusCode = Saml20Constants.StatusCodes.Success;
string message = string.Empty;
if(context.Request.RequestType == "GET") // HTTP Redirect binding
{
HttpRedirectBindingParser parser = new HttpRedirectBindingParser(context.Request.Url);
IDPEndPoint endpoint = config.FindEndPoint(idpEndpoint.Id);
if (endpoint.metadata == null)
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTREQUEST, "Cannot find metadata for IdP");
HandleError(context, "Cannot find metadata for IdP " + idpEndpoint.Id);
return;
}
Saml20MetadataDocument metadata = endpoint.metadata;
if (!parser.VerifySignature(metadata.GetKeys(KeyTypes.signing)))
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTREQUEST, "Invalid signature redirect-binding, msg: " + parser.Message);
HandleError(context, Resources.SignatureInvalid);
return;
}
message = parser.Message;
}
else if (context.Request.RequestType == "POST") // HTTP Post binding
{
HttpPostBindingParser parser = new HttpPostBindingParser(context);
if (!parser.IsSigned())
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTREQUEST, "Signature not present, msg: " + parser.Message);
HandleError(context, Resources.SignatureNotPresent);
}
IDPEndPoint endpoint = config.FindEndPoint(idpEndpoint.Id);
if (endpoint.metadata == null)
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTREQUEST, "Cannot find metadata for IdP");
HandleError(context, "Cannot find metadata for IdP " + idpEndpoint.Id);
return;
}
Saml20MetadataDocument metadata = endpoint.metadata;
// handle a logout-request
if (!parser.CheckSignature(metadata.GetKeys(KeyTypes.signing)))
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTREQUEST, "Invalid signature post-binding, msg: " + parser.Message);
HandleError(context, Resources.SignatureInvalid);
}
message = parser.Message;
}else
{
//Error: We don't support HEAD, PUT, CONNECT, TRACE, DELETE and OPTIONS
HandleError(context, Resources.UnsupportedRequestTypeFormat(context.Request.RequestType));
}
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTREQUEST, message);
//Log the user out locally
DoLogout(context, true);
LogoutRequest req = Serialization.DeserializeFromXmlString<LogoutRequest>(message);
response.InResponseTo = req.ID;
//Respond using redirect binding
if(destination.Binding == SAMLBinding.REDIRECT)
{
HttpRedirectBindingBuilder builder = new HttpRedirectBindingBuilder();
builder.RelayState = context.Request.Params["RelayState"];
builder.Response = response.GetXml().OuterXml;
builder.signingKey = FederationConfig.GetConfig().SigningCertificate.GetCertificate().PrivateKey;
string s = destination.Url + "?" + builder.ToQuery();
context.Response.Redirect(s, true);
return;
}
//Respond using post binding
if (destination.Binding == SAMLBinding.POST)
{
HttpPostBindingBuilder builder = new HttpPostBindingBuilder(destination);
builder.Action = SAMLAction.SAMLResponse;
XmlDocument responseDocument = response.GetXml();
XmlSignatureUtils.SignDocument(responseDocument, response.ID);
builder.Response = responseDocument.OuterXml;
builder.RelayState = context.Request.Params["RelayState"];
builder.GetPage().ProcessRequest(context);
return;
}
}
private void HandleResponse(HttpContext context)
{
Trace.TraceMethodCalled(GetType(), "HandleResponse()");
string message = string.Empty;
if(context.Request.RequestType == "GET")
{
HttpRedirectBindingParser parser = new HttpRedirectBindingParser(context.Request.Url);
LogoutResponse response = Serialization.DeserializeFromXmlString<LogoutResponse>(parser.Message);
IDPEndPoint idp = RetrieveIDPConfiguration(response.Issuer.Value);
AuditLogging.IdpId = idp.Id;
AuditLogging.AssertionId = response.ID;
if (idp.metadata == null)
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTRESPONSE,
string.Format("No IDP metadata, unknown IDP, response: {0}", parser.Message));
HandleError(context, Resources.UnknownIDP);
return;
}
if (!parser.VerifySignature(idp.metadata.Keys))
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTRESPONSE,
string.Format("Invalid signature in redirect-binding, response: {0}", parser.Message));
HandleError(context, Resources.SignatureInvalid);
return;
}
message = parser.Message;
}else if(context.Request.RequestType == "POST")
{
HttpPostBindingParser parser = new HttpPostBindingParser(context);
LogoutResponse response = Serialization.DeserializeFromXmlString<LogoutResponse>(parser.Message);
IDPEndPoint idp = RetrieveIDPConfiguration(response.Issuer.Value);
if (idp.metadata == null)
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTRESPONSE,
string.Format("No IDP metadata, unknown IDP, response: {0}", parser.Message));
HandleError(context, Resources.UnknownIDP);
return;
}
if (!parser.IsSigned())
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTRESPONSE,
string.Format("Signature not present, response: {0}", parser.Message));
HandleError(context, Resources.SignatureNotPresent);
}
// signature on final message in logout
if (!parser.CheckSignature(idp.metadata.Keys))
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTRESPONSE,
string.Format("Invalid signature in post-binding, response: {0}", parser.Message));
HandleError(context, Resources.SignatureInvalid);
}
message = parser.Message;
}else
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTRESPONSE,
string.Format("Unsupported request type format, type: {0}", context.Request.RequestType));
HandleError(context, Resources.UnsupportedRequestTypeFormat(context.Request.RequestType));
}
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTRESPONSE, message);
XmlDocument doc = new XmlDocument();
doc.PreserveWhitespace = true;
doc.LoadXml(message);
XmlElement statElem =
(XmlElement)doc.GetElementsByTagName(Status.ELEMENT_NAME, Saml20Constants.PROTOCOL)[0];
Status status = Serialization.DeserializeFromXmlString<Status>(statElem.OuterXml);
if (status.StatusCode.Value != Saml20Constants.StatusCodes.Success)
{
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTRESPONSE,
string.Format("Unexpected status code: {0}, msg: {1}", status.StatusCode.Value, message));
HandleError(context, status);
return;
}
AuditLogging.logEntry(Direction.IN, Operation.LOGOUTRESPONSE,
"Assertion validated succesfully");
//Log the user out locally
DoLogout(context);
}
