print barcode labels vb.net Lesson 2: Authorization and Impersonation in Visual C#.NET

Encoder Data Matrix in Visual C#.NET Lesson 2: Authorization and Impersonation

Lesson 2: Authorization and Impersonation
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Table 8-4
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Properties on the ClaimTypes Class Representing Claim URIs
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Description Gets the URI for a claim that specifies an RSA key. Gets the URI for a claim that specifies an SID. Gets the URI for a claim that specifies a service principal name (SPN) claim. Gets the URI for a claim that specifies the state or province in which an entity resides. Gets the URI for a claim that specifies the street address of an entity. Gets the URI for a claim that specifies the surname of an entity. This would typically be the last name of a person represented by the entity. Gets the URI for a claim that identifies the system entity. Gets the URI for a claim that specifies a thumbprint. Gets the URI for a claim that specifies a user principal name (UPN). Gets the URI for a claim that specifies a URI. Gets the URI for a claim that specifies the Web page of an entity.
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Name Rsa Sid Spn StateOrProvince StreetAddress Surname System Thumbprint Upn Uri Webpage
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X509DistinguishedName Gets the string that contains the URI for a distinguished name claim of an X.509 certificate.
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Properties on the Rights Class Representing Right URIs
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Description Gets a string that specifies that the right represents an identity Gets a string that specifies that the right represents a property that the entity associated with a claim possesses
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Name Identity PossessProperty
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The code from the previous example (which determined whether any claim represented an email address) is intended to be included in the logic for a service operation. However, that is not necessarily the best place to be performing this type of logic. In many cases, the desire to reuse authorization logic or to decouple the logic from the operations would lead to a more independent solution. In this case, the logic would be a custom authorization policy. To implement a custom authorization policy, start by creating a class that implements the IAuthorizationPolicy interface. The interface itself is fairly straightforward. There are two properties: Id and Issuer. The Id property is a unique identifier for the authorization component (which, in this case, is the instance of the custom policy class). The Issuer property is a ClaimSet that represents the entity that issued this policy. In both cases, these are read-only properties. From an implementation perspective, this means that the backing values for these properties should be set in the constructor and returned in the property Get function. This is
8
User-Level Security
demonstrated in the following code. Please be aware that this example is not, by itself, a full implementation of the CustomPolicy class. Specifically, the Evaluate method that is part of the IAuthorizationPolicy interface is covered later in this section.
' VB Public Class CustomPolicy Implements IAuthorizationPolicy Private _id As String Private _issuer As ClaimSet Public Sub New() _id = Guid.NewGuid().ToString() _issuer = ClaimSet.System End Sub 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 End Get End Property End Class // C# public class CustomPolicy : IAuthorizationPolicy { private string id; private ClaimSet issuer; public CustomPolicy() { id = Guid.NewGuid().ToString(); issuer = ClaimSet.System; } public string Id { get { return id; } } public ClaimSet Issuer { get { return issuer; }
Lesson 2: Authorization and Impersonation
In the constructor, the value of the Issuer property is set to the ClaimSet.System value. This value is used if the current application is the issuer of the claim. Technically, it indicates an application-trusted issuer without needing to provide additional details about the issuer. However, conventionally, it is used when the current application (or something that has been configured within the current application s configuration file) is issuing the claim. The only method that appears in the IAuthorizationPolicy interface is called Evaluate. This is where the majority of the work associated with the custom authorization policy takes place. The signature of the method includes an EvaluationContext and a state object.
' VB Public Function Evaluate(ByVal context As EvaluationContext, _ ByRef state As Object) As Boolean _ Implements IAuthorizationPolicy.Evaluate // C# public bool Evaluate(EvaluationContext context, ref object state)
The EvaluationContext object represents the results of an authorization policy doing its work. If claims are generated as part of an authorization policy, these claims are added to the evaluation context. The state object is simply an object that is passed into every invocation of the Evaluate method for a particular authorization policy. The actual method signature marks the state object as being passed by reference. This means that that method can create a new object and assign it to the state parameter. In practice, this parameter is frequently used as a cache for previously created claims or to ensure that claims are added only once. After the authorization policy has been created, it must be associated with the WCF authorization process. You can do this either imperatively or declaratively. When you do so imperatively, there is a little more work than normal. Start by creating a List of IAuthorizationPolicy objects. After all the policies have been added to the list, a read-only version of the list is assigned to the ExternalAuthorizationPolicies property on the Authorization property for the service host. The following code demonstrates this technique:
' VB Dim policies As List(Of IAuthorizationPolicy) = _ New List(Of IAuthorizationPolicy)() policies.Add(New CustomPolicy()) Dim host As New ServiceHost(GetType(TestService)) host.Authorization.ExternalAuthorizationPolicies = _ policies.AsReadOnly() // C# List<IAuthorizationPolicy> policies = new List<IAuthorizationPolicy>(); policies.Add(new CustomPolicy()); ServiceHost host = new ServiceHost(typeof(TestService));
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