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Procedura: disattivare sessioni protette in un'associazione WSFederationHttpBinding

  • Articolo

Alcuni servizi possono richiedere credenziali federate senza tuttavia supportare le sessioni protette. In questo caso occorre disattivare la funzionalità di sessione protetta. A differenza della classe WSHttpBinding, la classe WSFederationHttpBinding non fornisce alcuna modalità di disattivazione delle sessioni protette quando si comunica con un servizio. È invece necessario creare un'associazione personalizzata che sostituisce le impostazioni della sessione protetta con un bootstrap.

Questo argomento illustra come modificare gli elementi di un'associazione WSFederationHttpBinding per creare un'associazione personalizzata. Il risultato è un'associazione WSFederationHttpBinding uguale all'originale in cui tuttavia non vengono utilizzate sessioni protette.

Per creare un'associazione federata personalizzata senza sessioni protette

  1. Creare un'istanza della classe WSFederationHttpBinding o in modo imperativo nel codice oppure caricando un'associazione di questo tipo dal file di configurazione.

  2. Duplicare l'associazione WSFederationHttpBinding in un'associazione CustomBinding.

  3. Individuare l'elemento SecurityBindingElement all'interno dell'associazione CustomBinding.

  4. Individuare l'elemento SecureConversationSecurityTokenParameters all'interno dell'associazione SecurityBindingElement.

  5. Sostituire l'elemento SecurityBindingElement originale con l'elemento di associazione di sicurezza bootstrap ottenuto dai parametri SecureConversationSecurityTokenParameters.

Esempio

Nell'esempio seguente viene creata un'associazione federata personalizzata senza sessioni protette.

using System;
using System.Collections.Generic;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Security.Tokens;

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.
        }
    }

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





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

    Shared Sub Main()

    End Sub
End Class

Compilazione del codice

  • Per compilare l'esempio di codice, creare un progetto che fa riferimento all'assembly System.ServiceModel.dll.

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