IAuthorizationPolicy Interface

Définition

Espace de noms:

System.IdentityModel.Policy

Assembly:

System.ServiceModel.Security.dll

Assembly:

System.IdentityModel.dll

Définit un ensemble de règles pour autoriser un utilisateur en fonction d'un ensemble de revendications donné.

public interface class IAuthorizationPolicy

public interface class IAuthorizationPolicy : System::IdentityModel::Policy::IAuthorizationComponent

public interface IAuthorizationPolicy

public interface IAuthorizationPolicy : System.IdentityModel.Policy.IAuthorizationComponent

type IAuthorizationPolicy = interface

type IAuthorizationPolicy = interface
    interface IAuthorizationComponent

Public Interface IAuthorizationPolicy

Public Interface IAuthorizationPolicy
Implements IAuthorizationComponent

Implémente

IAuthorizationComponent

Exemples

public class MyAuthorizationPolicy : IAuthorizationPolicy
{
    string id;

    public MyAuthorizationPolicy()
    {
        id =  Guid.NewGuid().ToString();
    }

    public bool Evaluate(EvaluationContext evaluationContext, ref object state)
    {
        bool bRet = false;
        CustomAuthState customstate = null;

        // If state is null, then this method has not been called before, so
        // set up a custom state.
        if (state == null)
        {
            customstate = new CustomAuthState();
            state = customstate;
        }
        else
        {
            customstate = (CustomAuthState)state;
        }

        Console.WriteLine("Inside MyAuthorizationPolicy::Evaluate");

        // If claims have not been added yet...
        if (!customstate.ClaimsAdded)
        {
            // Create an empty list of Claims.
            IList<Claim> claims = new List<Claim>();

            // Iterate through each of the claim sets in the evaluation context.
            foreach (ClaimSet cs in evaluationContext.ClaimSets)
                // Look for Name claims in the current claim set.
                foreach (Claim c in cs.FindClaims(ClaimTypes.Name, Rights.PossessProperty))
                    // Get the list of operations the given username is allowed to call.
                    foreach (string s in GetAllowedOpList(c.Resource.ToString()))
                    {
                        // Add claims to the list.
                        claims.Add(new Claim("http://example.org/claims/allowedoperation", s, Rights.PossessProperty));
                        Console.WriteLine("Claim added {0}", s);
                    }

            // Add claims to the evaluation context.
            evaluationContext.AddClaimSet(this, new DefaultClaimSet(this.Issuer,claims));

            // Record that claims have been added.
            customstate.ClaimsAdded = true;

            // Return true, which indicates this need not be called again.
            bRet = true;
        }
        else
        {
            // This point should not be reached, but just in case...
            bRet = true;
        }

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

    public string Id
    {
        get { return id; }
    }

    // This method returns a collection of action strings that indicate the
    // operations that the specified username is allowed to call.
    private IEnumerable<string> GetAllowedOpList(string username)
    {
        IList<string> ret = new List<string>();

        if (username == "test1")
        {
            ret.Add ( "http://Microsoft.ServiceModel.Samples/ICalculator/Add");
            ret.Add ("http://Microsoft.ServiceModel.Samples/ICalculator/Multiply");
            ret.Add("http://Microsoft.ServiceModel.Samples/ICalculator/Subtract");
        }
        else if (username == "test2")
        {
            ret.Add ( "http://Microsoft.ServiceModel.Samples/ICalculator/Add");
            ret.Add ("http://Microsoft.ServiceModel.Samples/ICalculator/Subtract");
        }
        return ret;
    }

    // internal class for state
    class CustomAuthState
    {
        bool bClaimsAdded;

        public CustomAuthState()
        {
            bClaimsAdded = false;
        }

        public bool ClaimsAdded { get { return bClaimsAdded; }
                                  set {  bClaimsAdded = value; } }
    }
}

Public Class MyAuthorizationPolicy
    Implements IAuthorizationPolicy
    Private value_id As String


    Public Sub New()
        value_id = Guid.NewGuid().ToString()

    End Sub 

    Public Function Evaluate(ByVal evaluationContext As EvaluationContext, _
         ByRef state As Object) As Boolean Implements IAuthorizationPolicy.Evaluate

        Dim bRet As Boolean = False
        Dim customstate As CustomAuthState = Nothing

        ' If state is null, then this method has not been called before, so 
        ' set up a custom state.
        If state Is Nothing Then
            customstate = New CustomAuthState()
            state = customstate
        Else
            customstate = CType(state, CustomAuthState)
        End If
        Console.WriteLine("Inside MyAuthorizationPolicy::Evaluate")

        ' If the claims have not been added yet...
        If Not customstate.ClaimsAdded Then
            ' Create an empty list of Claims
            Dim claims As New List(Of Claim)

            ' Iterate through each of the claimsets in the evaluation context.
            Dim cs As ClaimSet
            For Each cs In evaluationContext.ClaimSets
                ' Look for Name claims in the current claim set.
                Dim c As Claim
                For Each c In cs.FindClaims(ClaimTypes.Name, Rights.PossessProperty)
                    ' Get the list of operations the given username is allowed to call.
                    Dim s As String
                    For Each s In GetAllowedOpList(c.Resource.ToString())

                        ' Add claims to the list
                        claims.Add(New Claim("http://example.org/claims/allowedoperation", _
                                    s, Rights.PossessProperty))
                        Console.WriteLine("Claim added {0}", s)
                    Next s
                Next c
            Next cs 
            
            ' Add claims to the evaluation context.
            evaluationContext.AddClaimSet(Me, New DefaultClaimSet(Me.Issuer, claims))

            ' Record that claims have been added.
            customstate.ClaimsAdded = True

            ' Return true, which indicates the method need not to be called again.
            bRet = True
        Else
            ' Should never get here, but just in case...
            bRet = True
        End If


        Return bRet

    End Function 'Evaluate

    Public ReadOnly Property Issuer() As ClaimSet Implements IAuthorizationPolicy.Issuer

        Get
            Return ClaimSet.System
        End Get
    End Property

    Public ReadOnly Property Id() As String Implements IAuthorizationPolicy.Id

        Get
            Return value_id
        End Get
    End Property
    ' This method returns a collection of action strings that indicate the 
    ' operations that the specified username is allowed to call.
    Private Shared Function GetAllowedOpList(ByVal username As String) As IEnumerable(Of String)


        Dim ret As New List(Of String)

        If username = "test1" Then
            ret.Add("http://Microsoft.ServiceModel.Samples/ICalculator/Add")
            ret.Add("http://Microsoft.ServiceModel.Samples/ICalculator/Multiply")
            ret.Add("http://Microsoft.ServiceModel.Samples/ICalculator/Subtract")
        ElseIf username = "test2" Then
            ret.Add("http://Microsoft.ServiceModel.Samples/ICalculator/Add")
            ret.Add("http://Microsoft.ServiceModel.Samples/ICalculator/Subtract")
        End If
        Return ret

    End Function 

    ' This is an internal class for state.
    Class CustomAuthState
        Private bClaimsAdded As Boolean


        Public Sub New()

        End Sub 


        Public Property ClaimsAdded() As Boolean
            Get
                Return bClaimsAdded
            End Get
            Set(ByVal value As Boolean)
                bClaimsAdded = value
            End Set
        End Property
    End Class 
End Class

Remarques

Implémentez l'interface IAuthorizationPolicy pour ajouter ou mapper un ensemble de revendications à un autre. Une stratégie d'autorisation examine un ensemble de revendications et ajoute des revendications supplémentaires en fonction de l'ensemble actuel. Par exemple, une stratégie d'autorisation peut évaluer une revendication qui contient la date de naissance, ajouter une revendication qui déclare que l'utilisateur a plus de 21 ans et ajouter une revendication Over21 (PlusDe21Ans) au EvaluationContext.

Les classes qui implémentent l'interface IAuthorizationPolicy n'accordent pas d'autorisation aux utilisateurs, mais elles permettent à la classe ServiceAuthorizationManager de le faire. Le ServiceAuthorizationManager appelle la méthode Evaluate pour chaque stratégie d'autorisation activée. La méthode Evaluate détermine si les revendications supplémentaires doivent être ajoutées pour l'utilisateur en fonction du contexte actuel. La méthode Evaluate d'une stratégie d'autorisation peut être appelée plusieurs fois, étant donné que les revendications sont ajoutées au EvaluationContext par d'autres stratégies d'autorisation. Lorsque toutes les stratégies d'autorisation activées sont effectuées, la classe ServiceAuthorizationManager accorde des autorisations en fonction de l'ensemble final de revendications. La classe ServiceAuthorizationManager crée ensuite un AuthorizationContext qui contient un ensemble immuable de revendications qui reflète ces autorisations.

Propriétés

Id	Obtient une chaîne qui identifie ce composant d'autorisation. (Hérité de IAuthorizationComponent)
Issuer	Obtient un ensemble de revendications qui représente l'émetteur de la stratégie d'autorisation.

Méthodes

Evaluate(EvaluationContext, Object)

Évalue si un utilisateur répond aux spécifications pour cette stratégie d'autorisation.

Voir aussi

• Exemple de stratégie d’autorisation