How to: Disable Secure Sessions on a WSFederationHttpBinding

Makale
03/22/2010

Some services may require federated credentials but not support secure sessions. In that case, you must disable the secure session feature. Unlike the WsHttpBinding, the WSFederationHttpBinding class does not provide a way to disable secure sessions when communicating with a service. Instead, you must create a custom binding that replaces the secure session settings with a bootstrap.

This topic demonstrates how to modify the binding elements contained within a WSFederationHttpBinding to create a custom binding. The result is identical to the WSFederationHttpBinding except that it does not use secure sessions.

To create a custom federated binding without secure session

Create an instance of the WSFederationHttpBinding class either imperatively in code or by loading one from the configuration file.
Clone the WSFederationHttpBinding into a CustomBinding.
Find the SecurityBindingElement in the CustomBinding.
Find the SecureConversationSecurityTokenParameters in the SecurityBindingElement.
Replace the original SecurityBindingElement with the bootstrap security binding element from the SecureConversationSecurityTokenParameters.

Example

This following example creates a custom federated binding without secure session.

Imports System
Imports System.Collections.Generic
Imports System.ServiceModel
Imports System.ServiceModel.Channels
Imports System.ServiceModel.Security.Tokens
Imports System.Security.Permissions


<Assembly: SecurityPermission(SecurityAction.RequestMinimum, Execution:=True)> 



Public NotInheritable Class CustomBindingCreator

    ' This method creates a CustomBinding based on a WSFederationHttpBinding which does not use secure conversation.
    Public Shared Function CreateFederationBindingWithoutSecureSession(ByVal inputBinding As WSFederationHttpBinding) As CustomBinding
        ' This CustomBinding starts out identical to the specified WSFederationHttpBinding.
        Dim outputBinding As New CustomBinding(inputBinding.CreateBindingElements())
        ' Find the SecurityBindingElement for message security.
        Dim security As SecurityBindingElement = outputBinding.Elements.Find(Of SecurityBindingElement)()
        ' If the security mode is message, then the secure session settings are the protection token parameters.
        Dim secureConversation As SecureConversationSecurityTokenParameters
        If WSFederationHttpSecurityMode.Message = inputBinding.Security.Mode Then
            Dim symmetricSecurity As SymmetricSecurityBindingElement = CType(security, SymmetricSecurityBindingElement)
            secureConversation = CType(symmetricSecurity.ProtectionTokenParameters, SecureConversationSecurityTokenParameters)
            ' If the security mode is message, then the secure session settings are the endorsing token parameters.
        ElseIf WSFederationHttpSecurityMode.TransportWithMessageCredential = inputBinding.Security.Mode Then
            Dim transportSecurity As TransportSecurityBindingElement = CType(security, TransportSecurityBindingElement)
            secureConversation = CType(transportSecurity.EndpointSupportingTokenParameters.Endorsing(0), SecureConversationSecurityTokenParameters)
        Else
            Throw New NotSupportedException(String.Format("Unhandled security mode {0}.", inputBinding.Security.Mode))
        End If
        ' Replace the secure session SecurityBindingElement with the bootstrap SecurityBindingElement.
        Dim securityIndex As Integer = outputBinding.Elements.IndexOf(security)
        outputBinding.Elements(securityIndex) = secureConversation.BootstrapSecurityBindingElement
        ' Return modified binding.
        Return outputBinding

    End Function

    ' It is a good practice to create a private constructor for a class that only 
    ' defines static methods.
    Private Sub New()

    End Sub 'New

    Shared Sub Main()

    End Sub 'Main
End Class 'CustomBindingCreator ' Code not shown.

using System;
using System.Collections.Generic;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Security.Tokens;
using System.Security.Permissions;
[assembly: SecurityPermission(
   SecurityAction.RequestMinimum, Execution = true)]
namespace Samples
{
    
    public sealed class CustomBindingCreator
    {
        // This method creates a CustomBinding based on a WSFederationHttpBinding which does not use secure conversation.
        public static CustomBinding CreateFederationBindingWithoutSecureSession(WSFederationHttpBinding inputBinding)
        {
            // This CustomBinding starts out identical to the specified WSFederationHttpBinding.
            CustomBinding outputBinding = new CustomBinding(inputBinding.CreateBindingElements());
            // Find the SecurityBindingElement for message security.
            SecurityBindingElement security = outputBinding.Elements.Find<SecurityBindingElement>();
            // If the security mode is message, then the secure session settings are the protection token parameters.
            SecureConversationSecurityTokenParameters secureConversation;
            if (WSFederationHttpSecurityMode.Message == inputBinding.Security.Mode)
            {
                SymmetricSecurityBindingElement symmetricSecurity = security as SymmetricSecurityBindingElement;
                secureConversation = symmetricSecurity.ProtectionTokenParameters as SecureConversationSecurityTokenParameters;
            }
            // If the security mode is message, then the secure session settings are the endorsing token parameters.
            else if (WSFederationHttpSecurityMode.TransportWithMessageCredential == inputBinding.Security.Mode)
            {
                TransportSecurityBindingElement transportSecurity = security as TransportSecurityBindingElement;
                secureConversation = transportSecurity.EndpointSupportingTokenParameters.Endorsing[0] as SecureConversationSecurityTokenParameters;
            }
            else
            {
                throw new NotSupportedException(String.Format("Unhandled security mode {0}.", inputBinding.Security.Mode));
            }
            // Replace the secure session SecurityBindingElement with the bootstrap SecurityBindingElement.
            int securityIndex = outputBinding.Elements.IndexOf(security);
            outputBinding.Elements[securityIndex] = secureConversation.BootstrapSecurityBindingElement;
            // Return modified binding.
            return outputBinding;
        }
        // It is a good practice to create a private constructor for a class that only 
        // defines static methods.
        private CustomBindingCreator() { }
        static void Main() 
        { 
            // Code not shown.
        }

    }

Compiling the Code

To compile the code example, create a project that references the System.ServiceModel.dll assembly.

Aracılığıyla paylaş

How to: Disable Secure Sessions on a WSFederationHttpBinding

To create a custom federated binding without secure session

Example

Compiling the Code

See Also

Concepts

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