PrincipalPermissionMode Enum

Definition

public enum class PrincipalPermissionMode

public enum PrincipalPermissionMode

type PrincipalPermissionMode = 

Public Enum PrincipalPermissionMode

Arv

Object

ValueType

Enum

PrincipalPermissionMode

Fält

Exempel

I följande exempel visas hur du anger UseAspNetRoles.

namespace TestPrincipalPermission
{
    class PrincipalPermissionModeWindows
    {

        [ServiceContract]
        interface ISecureService
        {
            [OperationContract]
            string Method1();
        }

        class SecureService : ISecureService
        {
            [PrincipalPermission(SecurityAction.Demand, Role = "everyone")]
            public string Method1()
            {
                return String.Format("Hello, \"{0}\"", Thread.CurrentPrincipal.Identity.Name);
            }
        }

        public void Run()
        {
            Uri serviceUri = new Uri(@"http://localhost:8006/Service");
            ServiceHost service = new ServiceHost(typeof(SecureService));
            service.AddServiceEndpoint(typeof(ISecureService), GetBinding(), serviceUri);
            service.Authorization.PrincipalPermissionMode = PrincipalPermissionMode.UseAspNetRoles;
            service.Open();

            EndpointAddress sr = new EndpointAddress(
                serviceUri, EndpointIdentity.CreateUpnIdentity(WindowsIdentity.GetCurrent().Name));
            ChannelFactory<ISecureService> cf = new ChannelFactory<ISecureService>(GetBinding(), sr);
            ISecureService client = cf.CreateChannel();
            Console.WriteLine("Client received response from Method1: {0}", client.Method1());
            ((IChannel)client).Close();
            Console.ReadLine();
            service.Close();
        }

        public static Binding GetBinding()
        {
            WSHttpBinding binding = new WSHttpBinding(SecurityMode.Message);
            binding.Security.Message.ClientCredentialType = MessageCredentialType.Windows;
            return binding;
        }
    }
}

Namespace TestPrincipalPermission
    Friend Class PrincipalPermissionModeWindows

        <ServiceContract> _
        Private Interface ISecureService
            <OperationContract> _
            Function Method1() As String
        End Interface

        Private Class SecureService
            Implements ISecureService
            <PrincipalPermission(SecurityAction.Demand, Role:="everyone")> _
            Public Function Method1() As String Implements ISecureService.Method1
                Return String.Format("Hello, ""{0}""", Thread.CurrentPrincipal.Identity.Name)
            End Function

        End Class

        Public Sub Run()
            Dim serviceUri As New Uri("http://localhost:8006/Service")
            Dim service As New ServiceHost(GetType(SecureService))
            service.AddServiceEndpoint(GetType(ISecureService), GetBinding(), serviceUri)
            service.Authorization.PrincipalPermissionMode = PrincipalPermissionMode.UseAspNetRoles
            service.Open()

            Dim sr As New EndpointAddress(serviceUri, EndpointIdentity.CreateUpnIdentity(WindowsIdentity.GetCurrent().Name))
            Dim cf As New ChannelFactory(Of ISecureService)(GetBinding(), sr)
            Dim client As ISecureService = cf.CreateChannel()
            Console.WriteLine("Client received response from Method1: {0}", client.Method1())
            CType(client, IChannel).Close()
            Console.ReadLine()
            service.Close()

        End Sub

        Public Shared Function GetBinding() As Binding
            Dim binding As New WSHttpBinding(SecurityMode.Message)
            binding.Security.Message.ClientCredentialType = MessageCredentialType.Windows
            Return binding
        End Function
    End Class
End Namespace

I följande exempel visas hur du anger Anpassad.

namespace CustomMode
{
    public class Test
    {
        public static void Main()
        {
            try
            {
                ShowPrincipalPermissionModeCustom ppwm = new ShowPrincipalPermissionModeCustom();
                ppwm.Run();
            }
            catch (Exception exc)
            {
                Console.WriteLine("Error: {0}", exc.Message);
                Console.ReadLine();
            }
        }
    }

    class ShowPrincipalPermissionModeCustom
    {
        [ServiceContract]
        interface ISecureService
        {
            [OperationContract]
            string Method1(string request);
        }

        [ServiceBehavior]
        class SecureService : ISecureService
        {
            [PrincipalPermission(SecurityAction.Demand, Role = "everyone")]
            public string Method1(string request)
            {
                return String.Format("Hello, \"{0}\"", Thread.CurrentPrincipal.Identity.Name);
            }
        }

        public void Run()
        {
            Uri serviceUri = new Uri(@"http://localhost:8006/Service");
            ServiceHost service = new ServiceHost(typeof(SecureService));
            service.AddServiceEndpoint(typeof(ISecureService), GetBinding(), serviceUri);
            List<IAuthorizationPolicy> policies = new List<IAuthorizationPolicy>();
            policies.Add(new CustomAuthorizationPolicy());
            service.Authorization.ExternalAuthorizationPolicies = policies.AsReadOnly();
            service.Authorization.PrincipalPermissionMode = PrincipalPermissionMode.Custom;
            service.Open();

            EndpointAddress sr = new EndpointAddress(
                serviceUri, EndpointIdentity.CreateUpnIdentity(WindowsIdentity.GetCurrent().Name));
            ChannelFactory<ISecureService> cf = new ChannelFactory<ISecureService>(GetBinding(), sr);
            ISecureService client = cf.CreateChannel();
            Console.WriteLine("Client received response from Method1: {0}", client.Method1("hello"));
            ((IChannel)client).Close();
            Console.ReadLine();
            service.Close();
        }

        public static Binding GetBinding()
        {
            WSHttpBinding binding = new WSHttpBinding(SecurityMode.Message);
            binding.Security.Message.ClientCredentialType = MessageCredentialType.Windows;
            return binding;
        }

        class CustomAuthorizationPolicy : IAuthorizationPolicy
        {
            string id = Guid.NewGuid().ToString();

            public string Id
            {
                get { return this.id; }
            }

            public ClaimSet Issuer
            {
                get { return ClaimSet.System; }
            }

            public bool Evaluate(EvaluationContext context, ref object state)
            {
                object obj;
                if (!context.Properties.TryGetValue("Identities", out obj))
                    return false;

                IList<IIdentity> identities = obj as IList<IIdentity>;
                if (obj == null || identities.Count <= 0)
                    return false;

                context.Properties["Principal"] = new CustomPrincipal(identities[0]);
                return true;
            }
        }

        class CustomPrincipal : IPrincipal
        {
            IIdentity identity;
            public CustomPrincipal(IIdentity identity)
            {
                this.identity = identity;
            }

            public IIdentity Identity
            {
                get { return this.identity; }
            }

            public bool IsInRole(string role)
            {
                return true;
            }
        }
    }
}

Namespace CustomMode
    Public Class Test
        Public Shared Sub Main()
            Try
                Dim ppwm As New ShowPrincipalPermissionModeCustom()
                ppwm.Run()

            Catch exc As Exception
                Console.WriteLine("Error: {0}", exc.Message)
                Console.ReadLine()
            End Try
        End Sub
    End Class

    Friend Class ShowPrincipalPermissionModeCustom
        <ServiceContract> _
        Private Interface ISecureService
            <OperationContract> _
            Function Method1(ByVal request As String) As String
        End Interface

        <ServiceBehavior> _
        Private Class SecureService
            Implements ISecureService
            <PrincipalPermission(SecurityAction.Demand, Role:="everyone")> _
            Public Function Method1(ByVal request As String) As String Implements ISecureService.Method1
                Return String.Format("Hello, ""{0}""", Thread.CurrentPrincipal.Identity.Name)
            End Function
        End Class

        Public Sub Run()
            Dim serviceUri As New Uri("http://localhost:8006/Service")
            Dim service As New ServiceHost(GetType(SecureService))
            service.AddServiceEndpoint(GetType(ISecureService), GetBinding(), serviceUri)
            Dim policies As New List(Of IAuthorizationPolicy)()
            policies.Add(New CustomAuthorizationPolicy())
            service.Authorization.ExternalAuthorizationPolicies = policies.AsReadOnly()
            service.Authorization.PrincipalPermissionMode = PrincipalPermissionMode.Custom
            service.Open()

            Dim sr As New EndpointAddress(serviceUri, EndpointIdentity.CreateUpnIdentity(WindowsIdentity.GetCurrent().Name))
            Dim cf As New ChannelFactory(Of ISecureService)(GetBinding(), sr)
            Dim client As ISecureService = cf.CreateChannel()
            Console.WriteLine("Client received response from Method1: {0}", client.Method1("hello"))
            CType(client, IChannel).Close()
            Console.ReadLine()
            service.Close()
        End Sub

        Public Shared Function GetBinding() As Binding
            Dim binding As New WSHttpBinding(SecurityMode.Message)
            binding.Security.Message.ClientCredentialType = MessageCredentialType.Windows
            Return binding
        End Function

        Private Class CustomAuthorizationPolicy
            Implements IAuthorizationPolicy
            Private id_Renamed As String = Guid.NewGuid().ToString()

            Public ReadOnly Property Id() As String Implements System.IdentityModel.Policy.IAuthorizationComponent.Id
                Get
                    Return Me.id_Renamed
                End Get
            End Property

            Public ReadOnly Property Issuer() As ClaimSet Implements IAuthorizationPolicy.Issuer
                Get
                    Return ClaimSet.System
                End Get
            End Property

            Public Function Evaluate(ByVal context As EvaluationContext, ByRef state As Object) As Boolean Implements IAuthorizationPolicy.Evaluate
                Dim obj As Object = Nothing
                If (Not context.Properties.TryGetValue("Identities", obj)) Then
                    Return False
                End If

                Dim identities As IList(Of IIdentity) = TryCast(obj, IList(Of IIdentity))
                If obj Is Nothing OrElse identities.Count <= 0 Then
                    Return False
                End If

                context.Properties("Principal") = New CustomPrincipal(identities(0))
                Return True
            End Function
        End Class

        Private Class CustomPrincipal
            Implements IPrincipal
            Private identity_Renamed As IIdentity
            Public Sub New(ByVal identity As IIdentity)
                Me.identity_Renamed = identity
            End Sub

            Public ReadOnly Property Identity() As IIdentity Implements IPrincipal.Identity
                Get
                    Return Me.identity_Renamed
                End Get
            End Property

            Public Function IsInRole(ByVal role As String) As Boolean Implements IPrincipal.IsInRole
                Return True
            End Function
        End Class
    End Class
End Namespace

Kommentarer

När du tillämpar på PrincipalPermissionAttribute en metod anger det här läget vilken uppsättning roller som ska användas vid auktorisering av åtkomst. Som standard använder attributet Windows grupper (till exempel Administrator eller Users) för att ange den roll som användaren måste tillhöra.

Om du vill ange läget programmatiskt skapar du en instans av ServiceHost klassen, letar ServiceAuthorizationBehavior upp i sin samling av beteenden och ställer in PrincipalPermissionMode till lämplig uppräkning. I följande exempel anges egenskapen till UseAspNetRoles.

ServiceHost myServiceHost = new ServiceHost(typeof(Calculator), baseUri);
ServiceAuthorizationBehavior myServiceBehavior =
    myServiceHost.Description.Behaviors.Find<ServiceAuthorizationBehavior>();
myServiceBehavior.PrincipalPermissionMode =
    PrincipalPermissionMode.UseAspNetRoles;

Dim myServiceHost As New ServiceHost(GetType(Calculator), baseUri)
Dim myServiceBehavior As ServiceAuthorizationBehavior = myServiceHost.Description.Behaviors.Find(Of ServiceAuthorizationBehavior)()
myServiceBehavior.PrincipalPermissionMode = PrincipalPermissionMode.UseAspNetRoles

Du kan också ange beteendet i konfigurationen genom att lägga till en <serviceAuthorization> i <serviceBehaviors för en konfigurationsfil> , enligt följande kod.

// Only a client authenticated with a valid certificate that has the
// specified subject name and thumbprint can call this method.
[PrincipalPermission(SecurityAction.Demand,
     Name = "CN=ReplaceWithSubjectName; 123456712345677E8E230FDE624F841B1CE9D41E")]
public double Multiply(double a, double b)
{
    return a * b;
}

' Only a client authenticated with a valid certificate that has the 
' specified subject name and thumbprint can call this method.
<PrincipalPermission(SecurityAction.Demand, Name := "CN=ReplaceWithSubjectName; 123456712345677E8E230FDE624F841B1CE9D41E")> _
Public Function Multiply(ByVal a As Double, ByVal b As Double) As Double
    Return a * b
End Function

Uppräkningen påverkar hur PrincipalPermissionAttribute attributet auktoriserar en användare när det tillämpas på en metod. I följande exempel tillämpas attributet på en metod och kräver att användaren tillhör gruppen Användare på datorn. Den här koden fungerar bara när PrincipalPermissionMode är inställd UseWindowsGroup på (standardinställningen).

// Only members of the CalculatorClients group can call this method.
[PrincipalPermission(SecurityAction.Demand, Role = "Users")]
public double Add(double a, double b)
{
    return a + b;
}

' Only members of the CalculatorClients group can call this method.
<PrincipalPermission(SecurityAction.Demand, Role := "Users")> _
Public Function Add(ByVal a As Double, ByVal b As Double) As Double
    Return a + b
End Function

UseAspNetRoles

Värdet UseAspNetRoles används för alla typer av autentiseringsuppgifter. Med det här läget kan Windows Communication Foundation (WCF) använda ASP.NET rollprovider för att fatta auktoriseringsbeslut.

När autentiseringsuppgifterna för en tjänst är ett X.509-certifikat kan du ange Name egenskapen för till PrincipalPermissionAttribute en sträng som består av de sammanfogade värdena i fältet Ämne och fältet Tumavtryck, som du ser i följande exempel.

ServiceHost myServiceHost = new ServiceHost(typeof(Calculator), baseUri);
ServiceAuthorizationBehavior myServiceBehavior =
    myServiceHost.Description.Behaviors.Find<ServiceAuthorizationBehavior>();
myServiceBehavior.PrincipalPermissionMode =
    PrincipalPermissionMode.UseAspNetRoles;
MyServiceAuthorizationManager sm = new MyServiceAuthorizationManager();
myServiceBehavior.ServiceAuthorizationManager = sm;

Dim myServiceHost As New ServiceHost(GetType(Calculator), baseUri)
Dim myServiceBehavior As ServiceAuthorizationBehavior = myServiceHost.Description.Behaviors.Find(Of ServiceAuthorizationBehavior)()
myServiceBehavior.PrincipalPermissionMode = PrincipalPermissionMode.UseAspNetRoles
Dim sm As New MyServiceAuthorizationManager()
myServiceBehavior.ServiceAuthorizationManager = sm

Den sammanfogade strängen består av ämnes- och tumavtrycksvärdena avgränsade med ett semikolon och ett blanksteg.

Det är också möjligt att ett certifikat har ett ämnesfält inställt på en null-sträng. I så fall kan du ange Name egenskapen till ett semikolon följt av ett blanksteg och sedan tumavtrycket, som du ser i följande exempel.

// Only a client authenticated with a valid certificate that has the
// specified thumbprint can call this method.
[PrincipalPermission(SecurityAction.Demand,
     Name = "; 123456712345677E8E230FDE624F841B1CE9D41E")]
public double Divide(double a, double b)
{
    return a * b;
}

' Only a client authenticated with a valid certificate that has the 
' specified thumbprint can call this method.
<PrincipalPermission(SecurityAction.Demand, Name := "; 123456712345677E8E230FDE624F841B1CE9D41E")> _
Public Function Divide(ByVal a As Double, ByVal b As Double) As Double
    Return a * b
End Function

Om det finns en ASP.NET rollprovider kan du också ange egenskapen Role till en roll i databasen. Som standard representeras databasen av SqlRoleProvider. Du kan också ange en anpassad rollprovider med RoleProvider egenskapen för ServiceAuthorizationBehavior klassen. Följande kod anger rollen till Administrators. Observera att rollprovidern måste mappa användarkontot till den rollen.

[PrincipalPermission(SecurityAction.Demand, Role = "Administrators")]
public string ReadFile(string fileName)
{
    // Code not shown.
    return "Not implemented";
}

<PrincipalPermission(SecurityAction.Demand, Role := "Administrators")> _
Public Function ReadFile(ByVal fileName As String) As String
    ' Code not shown.
    Return "Not implemented"
End Function

Mer information om hur du använder WCF och rollprovidern finns i How to: Use the ASP.NET Role Provider with a Service.

Skräddarsydd

När egenskapen är inställd på Anpassad måste du också ange en anpassad klass som implementerar IAuthorizationPolicy klassen. Den här klassen ansvarar för att tillhandahålla uppringarens IPrincipal representation i Properties samlingen. Den måste lagra instansen IPrincipal i egenskapssamlingen med strängnyckeln "Principal", som du ser i följande exempel.

evaluationContext.Properties["Principal"]=new CustomPrincipal(identity);

Bakgrund

Den rollbaserade säkerheten i .NET Framework gör det möjligt för program att ange auktoriseringar via kod. Genom att PrincipalPermission ange efterfrågan CurrentPrincipal måste uppfylla PrincipalPermission kravet. Till exempel att användaren måste vara i en viss roll eller grupp. Annars har tråden inte behörighet att köra koden, vilket resulterar i ett undantag. WCF innehåller en uppsättning PrincipalPermissionMode val för att ange CurrentPrincipal baserat på SecurityContext detta.