PrincipalPermissionAttribute PrincipalPermissionAttribute PrincipalPermissionAttribute PrincipalPermissionAttribute Class

Definition

Allows security actions for PrincipalPermission to be applied to code using declarative security. This class cannot be inherited.

public ref class PrincipalPermissionAttribute sealed : System::Security::Permissions::CodeAccessSecurityAttribute
[System.AttributeUsage(System.AttributeTargets.Class | System.AttributeTargets.Method, AllowMultiple=true, Inherited=false)]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class PrincipalPermissionAttribute : System.Security.Permissions.CodeAccessSecurityAttribute
type PrincipalPermissionAttribute = class
    inherit CodeAccessSecurityAttribute
Public NotInheritable Class PrincipalPermissionAttribute
Inherits CodeAccessSecurityAttribute
Inheritance
Attributes

Examples

The following example demonstrates how the PrincipalPermissionAttribute class is used declaratively to demand that the current user be an administrator.

Note

In Windows Vista, User Account Control (UAC) determines the privileges of a user. If you are a member of the Built-in Administrators group, you are assigned two run-time access tokens: a standard user access token and an administrator access token. By default, you are in the standard user role. To execute the code that requires you to be an administrator, you must first elevate your privileges from standard user to administrator. You can do this when you start an application by right-clicking the application icon and indicating that you want to run as an administrator.

using namespace System;
using namespace System::Security;
using namespace System::Security::Permissions;
using namespace System::Security::Policy;
using namespace System::Security::Principal;

[PrincipalPermission(SecurityAction::Demand, Role = "Administrators")]
void CheckAdministrator()
{
	Console::WriteLine("User is an administrator.");
}
int main(array<System::String ^> ^args)
{
	try
	{
		// Must set PrincipalPolicy to WindowsPrincipal
		AppDomain::CurrentDomain->SetPrincipalPolicy(PrincipalPolicy::WindowsPrincipal);
		// Check using declarative security.
		CheckAdministrator();
		// Check using Imperative security.
		System::String^ null;
		PrincipalPermission^ principalPerm = gcnew PrincipalPermission(null, "Administrators" );
		principalPerm->Demand();
		Console::WriteLine("Demand succeeded");
	}
	catch (Exception ^e)
	{
		Console::WriteLine(e->Message);
	}
	return 0;
}


using System;
using System.Threading;
using System.Security.Permissions;
using System.Security.Principal;

class SecurityPrincipalDemo
{
    public static void Main()
    {
        try
        {
            // PrincipalPolicy must be set to WindowsPrincipal to check roles.
            AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
            // Check using the PrincipalPermissionAttribute
            CheckAdministrator();
            // Check using PrincipalPermission class.
            PrincipalPermission principalPerm = new PrincipalPermission(null, "Administrators");
            principalPerm.Demand();
            Console.WriteLine("Demand succeeded.");
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }
    [PrincipalPermission(SecurityAction.Demand, Role = "Administrators")]
    static void CheckAdministrator()
    {
        Console.WriteLine("User is an administrator");
    }
}
Imports System
Imports System.Threading
Imports System.Security.Permissions
Imports System.Security.Principal



Class SecurityPrincipalDemo

    Public Shared Sub Main()
        Try
            ' PrincipalPolicy must be set to WindowsPrincipal to check roles.
            AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal)
            ' Check using the PrincipalPermissionAttribute
            CheckAdministrator()
            ' Check using PrincipalPermission class.
            Dim principalPerm As New PrincipalPermission(Nothing, "Administrators")
            principalPerm.Demand()
            Console.WriteLine("Demand succeeded.")
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try

    End Sub 'Main

    <PrincipalPermission(SecurityAction.Demand, Role:="Administrators")> _
    Shared Sub CheckAdministrator()
        Console.WriteLine("User is an administrator")

    End Sub 'CheckAdministrator
End Class 'SecurityPrincipalDemo

Remarks

PrincipalPermissionAttribute can be used to declaratively demand that users running your code belong to a specified role or have been authenticated. Use of Unrestricted creates a PrincipalPermission with Authenticated set to true and Name and Role set to null.

The scope of the declaration that is allowed depends on the SecurityAction that is used. PrincipalPermissionAttribute cannot be applied at the assembly level.

The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. Security attributes are used only for declarative security. For imperative security, use the corresponding permission class.

Important

Before you use this class to demand principal permission, you must set the current application domain's principal policy to the enumeration value WindowsPrincipal. By default, the principal policy is set to UnauthenticatedPrincipal. If you do not set the principal policy to WindowsPrincipal, a demand for principal permission will fail. The following code should be executed before the principal permission is demanded: AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal).

Constructors

PrincipalPermissionAttribute(SecurityAction) PrincipalPermissionAttribute(SecurityAction) PrincipalPermissionAttribute(SecurityAction) PrincipalPermissionAttribute(SecurityAction)

Initializes a new instance of the PrincipalPermissionAttribute class with the specified SecurityAction.

Properties

Action Action Action Action

Gets or sets a security action.

(Inherited from SecurityAttribute)
Authenticated Authenticated Authenticated Authenticated

Gets or sets a value indicating whether the current principal has been authenticated by the underlying role-based security provider.

Name Name Name Name

Gets or sets the name of the identity associated with the current principal.

Role Role Role Role

Gets or sets membership in a specified security role.

TypeId TypeId TypeId TypeId

When implemented in a derived class, gets a unique identifier for this Attribute.

(Inherited from Attribute)
Unrestricted Unrestricted Unrestricted Unrestricted

Gets or sets a value indicating whether full (unrestricted) permission to the resource protected by the attribute is declared.

(Inherited from SecurityAttribute)

Methods

CreatePermission() CreatePermission() CreatePermission() CreatePermission()

Creates and returns a new PrincipalPermission.

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Returns a value that indicates whether this instance is equal to a specified object.

(Inherited from Attribute)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Returns the hash code for this instance.

(Inherited from Attribute)
GetType() GetType() GetType() GetType()

Gets the Type of the current instance.

(Inherited from Object)
IsDefaultAttribute() IsDefaultAttribute() IsDefaultAttribute() IsDefaultAttribute()

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.

(Inherited from Attribute)
Match(Object) Match(Object) Match(Object) Match(Object)

When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.

(Inherited from Attribute)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

Returns a string that represents the current object.

(Inherited from Object)

Explicit Interface Implementations

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) _Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) _Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) _Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.

(Inherited from Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr) _Attribute.GetTypeInfo(UInt32, UInt32, IntPtr) _Attribute.GetTypeInfo(UInt32, UInt32, IntPtr) _Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.

(Inherited from Attribute)
_Attribute.GetTypeInfoCount(UInt32) _Attribute.GetTypeInfoCount(UInt32) _Attribute.GetTypeInfoCount(UInt32) _Attribute.GetTypeInfoCount(UInt32)

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

(Inherited from Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) _Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) _Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) _Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.

(Inherited from Attribute)

Applies to

See Also