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4. Change the class declaration to the following:
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' VB Public Class SpecificRoleAuthorizationPolicy Implements IAuthorizationPolicy // C# public class SpecificRoleAuthorizationPolicy : IAuthorizationPolicy
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Before implementing the IAuthorizationPolicy interface, create a couple of local variables. The id class-level variable provides a globally unique identifier (GUID) that uniquely identifies the instance of the policy. Although not used in this exercise, it could be used to help cache values associated with this instance in the state parameter passed into the Validate method. The issuer class-level variable stores the ClaimSet that represents the issuer of the policy. Set these values in the constructor. 5. Add the following code to the SpecificRoleAuthorizationPolicy class:
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' VB Dim _id As String Dim _issuer As ClaimSet Public Sub New() _id = Guid.NewGuid().ToString() _issuer = ClaimSet.System End Sub // C# private string id; private ClaimSet issuer; public SpecificRoleAuthorizationPolicy() { id = Guid.NewGuid().ToString(); issuer = ClaimSet.System; }
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The private variables need to have a public property. Both of these are read-only, and they happen to be two of the methods that are part of the IAuthorizationPolicy interface. 6. Add the following code to the class:
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' VB Public ReadOnly Property Id() As String _ Implements IAuthorizationPolicy.Id Get Return _id End Get End Property Public ReadOnly Property Issuer() As ClaimSet _ Implements IAuthorizationPolicy.Issuer Get Return _issuer
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Lesson 2: Authorization and Impersonation
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End Get End Property // C# public string Id { get { return id; } } public ClaimSet Issuer { get { return issuer; } }
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The second method the IAuthorizationPolicy interface requires is named Evaluate. This method is invoked in the authorization part of WCF. 7. Start by adding the following method definition to the class.
' VB Public Function Evaluate(context As EvaluationContext, _ ByRef state As Object) As Boolean _ Implements IAuthorizationPolicy.Evaluate End Function // C# public bool Evaluate(EvaluationContext context, ref object state) { }
Within this method, you add a principal that contains the HeaderPeople role to the evaluation context. To do this, you must get an object that implements IIdentity. Such an object is available if WCF has authenticated the request. This information is available in the Properties collection of the EvaluationContext object. 8. Add the following code to the Evaluate method:
' VB Dim prop As Object = Nothing If Not context.Properties.TryGetValue("Identities", prop) Then Return False End If // C# object prop; if (!context.Properties.TryGetValue("Identities", out prop)) return false;
When the Identities property has been retrieved, the result (found in the prop variable) should be a list of IIdentity objects. If so, an instance of a GenericPrincipal object is created and assigned to the Principal property within the EvaluationContext.
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9. Add the following code below the just-added lines in the Evaluate method.
' VB Dim identities As List(Of IIdentity) = TryCast(prop, List(Of IIdentity)) If identities Is Nothing OrElse identities.Count = 0 Then Return False End If context.Properties("Principal") = new GenericPrincipal(identities(0), _ New String() { "HeaderPeople" }) Return True // C# List<IIdentity> identities = prop as List<IIdentity>; if (identities == null || identities.Count == 0) return false; context.Properties["Principal"] = new GenericPrincipal(identities[0], new string[] { "HeaderPeople" }); return true;
Now that the policy has been created, you must add it into the WCF pipeline. 10. In Solution Explorer, double-click the app.config file in the DemoService project. 11. Locate the behaviors section. You will see that a behavior is already defined with a name of DemoService.HeaderServiceBehavior. Because you are dealing with the authorization process, using the serviceAuthorization element makes sense. Within that element, authorizationPolicies includes a list of the classes that implement IAuthorizationPolicy. Inclusion in this list indicates to WCF that the policy should be processed. 12. Add the following XML within the behavior element.
<serviceAuthorization> <authorizationPolicies> <add policyType= "DemoService.SpecificRoleAuthorizationPolicy,DemoService" /> </authorizationPolicies> </serviceAuthorization>
Although it might appear that this should be sufficient, it isn t. Specifically, the Principal property that was added to the EvaluationContext is not processed by the WCF pipeline unless the service is explicitly directed to process it. To tell WCF to process the Principal property, the principalPermissionMode attribute must be set to Custom. 13. Change the serviceAuthorization element to look like the following:
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