Using SOAP based approach with WSDL instead of adding service reference

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C#

WCF

security

SOAP

SAML

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I am trying to create a SOAP request instead of adding service reference that generates proxy classes. The main challenge am facing is with Authentication part. The service provider has 2 URLs 1) Security Token Service [STS] 2) Main service to be called for certain functionality.

The service provider has issued us the public certificate(X.509). This needs to be passed when a call is made to the STS. This service then issues us the SAML token which needs to be part of request to the main service.

With adding service reference approach it was easy to achieve as we just need to create a custom binding object where all the necessary properties are set related to authentication. This binding object was then passed as a parameter along with endpoint address to the proxy class object. Then the proxy class object is set with the certificate. A desired API is called once the certificate and binding object is set.

eg:

ServiceClient client = new ServiceClient(binding, endpointAddress); Client.ClientCredentials.ClientCertificate.SetCertificate(StoreLocation.CurrentUser, StoreName.My, X509FindType.FindByIssuerName, IssuerName); client.CallServiceAPI();

On execution if we look at the fiddler tool, we have 2 requests sent one for STS and main service.

Am finding challenge in achieving this via SOAP based approach. Any pointers or suggestions on this is much appreciated.

What I have tried:

I have tried to create request based on the fiddler request structure. But i end up getting internal server error 500.