CodeAccessPermission Clase
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Precaución
Code Access Security is not supported or honored by the runtime.
Define la estructura subyacente de todos los permisos de acceso del código.
public ref class CodeAccessPermission abstract : System::Security::IPermission, System::Security::IStackWalkpublic abstract class CodeAccessPermission : System.Security.IPermission, System.Security.IStackWalk[System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public abstract class CodeAccessPermission : System.Security.IPermission, System.Security.IStackWalk[System.Serializable]
public abstract class CodeAccessPermission : System.Security.IPermission, System.Security.IStackWalk[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class CodeAccessPermission : System.Security.IPermission, System.Security.IStackWalktype CodeAccessPermission = class
interface IPermission
interface ISecurityEncodable
interface IStackWalk[<System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type CodeAccessPermission = class
interface IPermission
interface ISecurityEncodable
interface IStackWalk[<System.Serializable>]
type CodeAccessPermission = class
interface IPermission
interface ISecurityEncodable
interface IStackWalk[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type CodeAccessPermission = class
interface IPermission
interface ISecurityEncodable
interface IStackWalkPublic MustInherit Class CodeAccessPermission
Implements IPermission, IStackWalk- Herencia
-
CodeAccessPermission
- Derivado
- Atributos
- Implementaciones
Ejemplos
En el ejemplo de código siguiente se muestra un permiso derivado de la CodeAccessPermission clase .
//#define debug
// This custom permission is intended only for the purposes of illustration.
// The following code shows how to create a custom permission that inherits
// from CodeAccessPermission. The code implements all required overrides.
// A wildcard character ('*') is implemented for the Name property.
using namespace System;
using namespace System::Security;
using namespace System::Security::Permissions;
using namespace System::IO;
using namespace System::Security::Policy;
using namespace System::Collections;
using namespace System::Text;
[assembly:System::Reflection::AssemblyKeyFile("Key.snk")];
[assembly:System::Security::AllowPartiallyTrustedCallersAttribute];
[Serializable]
public ref class NameIdPermission: public CodeAccessPermission, public IUnrestrictedPermission
{
private:
String^ m_Name;
bool m_Unrestricted;
public:
NameIdPermission( String^ name )
{
m_Name = name;
}
NameIdPermission( PermissionState state )
{
if ( state == PermissionState::None )
{
m_Name = "";
}
else if ( state == PermissionState::Unrestricted )
{
throw gcnew ArgumentException( "Unrestricted state is not allowed for identity permissions." );
}
else
{
throw gcnew ArgumentException( "Invalid permission state." );
}
}
property String^ Name
{
String^ get()
{
return m_Name;
}
void set( String^ value )
{
m_Name = value;
}
}
public:
virtual IPermission^ Copy() override
{
String^ name = m_Name;
return gcnew NameIdPermission( name );
}
public:
virtual bool IsUnrestricted()
{
// Always false, unrestricted state is not allowed.
return m_Unrestricted;
}
private:
bool VerifyType( IPermission^ target )
{
return dynamic_cast<NameIdPermission^>(target) != nullptr;
}
public:
virtual bool IsSubsetOf( IPermission^ target ) override
{
#if ( debug )
Console::WriteLine( "************* Entering IsSubsetOf *********************" );
#endif
if ( target == nullptr )
{
Console::WriteLine( "IsSubsetOf: target == null" );
return false;
}
#if ( debug )
Console::WriteLine( "This is = {0}", ((NameIdPermission)this).Name );
Console::WriteLine( "Target is {0}", ((NameIdPermission)target).m_Name );
#endif
try
{
NameIdPermission^ operand = dynamic_cast<NameIdPermission^>(target);
// The following check for unrestricted permission is only included as an example for
// permissions that allow the unrestricted state. It is of no value for this permission.
if ( true == operand->m_Unrestricted )
{
return true;
}
else if ( true == this->m_Unrestricted )
{
return false;
}
if ( this->m_Name != nullptr )
{
if ( operand->m_Name == nullptr )
{
return false;
}
if ( this->m_Name->Equals( "" ) )
{
return true;
}
}
if ( this->m_Name->Equals( operand->m_Name ) )
{
return true;
}
else
{
// Check for wild card character '*'.
int i = operand->m_Name->LastIndexOf( "*" );
if ( i > 0 )
{
String^ prefix = operand->m_Name->Substring( 0, i );
if ( this->m_Name->StartsWith( prefix ) )
{
return true;
}
}
}
return false;
}
catch ( InvalidCastException^ )
{
throw gcnew ArgumentException( String::Format( "Argument_WrongType", this->GetType()->FullName ) );
}
}
public:
virtual IPermission^ Intersect( IPermission^ target ) override
{
Console::WriteLine( "************* Entering Intersect *********************" );
if ( target == nullptr )
{
return nullptr;
}
#if ( debug )
Console::WriteLine( "This is = {0}", ((NameIdPermission)this).Name );
Console::WriteLine( "Target is {0}", ((NameIdPermission)target).m_Name );
#endif
if ( !VerifyType( target ) )
{
throw gcnew ArgumentException( String::Format( "Argument is wrong type.", this->GetType()->FullName ) );
}
NameIdPermission^ operand = dynamic_cast<NameIdPermission^>(target);
if ( operand->IsSubsetOf( this ) )
{
return operand->Copy();
}
else if ( this->IsSubsetOf( operand ) )
{
return this->Copy();
}
else
{
return nullptr;
}
}
public:
virtual IPermission^ Union( IPermission^ target ) override
{
#if ( debug )
Console::WriteLine( "************* Entering Union *********************" );
#endif
if ( target == nullptr )
{
return this;
}
#if ( debug )
Console::WriteLine( "This is = {0}", ((NameIdPermission)this).Name );
Console::WriteLine( "Target is {0}", ((NameIdPermission)target).m_Name );
#endif
if ( !VerifyType( target ) )
{
throw gcnew ArgumentException( String::Format( "Argument_WrongType", this->GetType()->FullName ) );
}
NameIdPermission^ operand = dynamic_cast<NameIdPermission^>(target);
if ( operand->IsSubsetOf( this ) )
{
return this->Copy();
}
else if ( this->IsSubsetOf( operand ) )
{
return operand->Copy();
}
else
{
return nullptr;
}
}
public:
virtual void FromXml( SecurityElement^ e ) override
{
// The following code for unrestricted permission is only included as an example for
// permissions that allow the unrestricted state. It is of no value for this permission.
String^ elUnrestricted = e->Attribute("Unrestricted");
if ( nullptr != elUnrestricted )
{
m_Unrestricted = Boolean::Parse( elUnrestricted );
return;
}
String^ elName = e->Attribute("Name");
m_Name = elName == nullptr ? nullptr : elName;
}
public:
virtual SecurityElement^ ToXml() override
{
// Use the SecurityElement class to encode the permission to XML.
SecurityElement^ esd = gcnew SecurityElement( "IPermission" );
String^ name = NameIdPermission::typeid->AssemblyQualifiedName;
esd->AddAttribute( "class", name );
esd->AddAttribute( "version", "1.0" );
// The following code for unrestricted permission is only included as an example for
// permissions that allow the unrestricted state. It is of no value for this permission.
if ( m_Unrestricted )
{
esd->AddAttribute( "Unrestricted", true.ToString() );
}
if ( m_Name != nullptr )
{
esd->AddAttribute( "Name", m_Name );
}
return esd;
}
};
//#define debug
// This custom permission is intended only for the purposes of illustration.
// The following code shows how to create a custom permission that inherits
// from CodeAccessPermission. The code implements all required overrides.
// A wildcard character ('*') is implemented for the Name property.
using System;
using System.Security;
using System.Security.Permissions;
using System.IO;
using System.Security.Policy;
using System.Collections;
using System.Text;
[assembly:System.Reflection.AssemblyKeyFile("Key.snk")]
[assembly:System.Security.AllowPartiallyTrustedCallersAttribute()]
namespace MyPermission
{
[Serializable()] sealed public class NameIdPermission : CodeAccessPermission, IUnrestrictedPermission
{
private String m_Name;
private bool m_Unrestricted;
public NameIdPermission(String name)
{
m_Name = name;
}
public NameIdPermission(PermissionState state)
{
if (state == PermissionState.None)
{
m_Name = "";
}
else
if (state == PermissionState.Unrestricted)
{
throw new ArgumentException("Unrestricted state is not allowed for identity permissions.");
}
else
{
throw new ArgumentException("Invalid permission state.");
}
}
public String Name
{
set{m_Name = value;}
get{ return m_Name;}
}
public override IPermission Copy()
{
string name = m_Name;
return new NameIdPermission( name );
}
public bool IsUnrestricted()
{
// Always false, unrestricted state is not allowed.
return m_Unrestricted;
}
private bool VerifyType(IPermission target)
{
return (target is NameIdPermission);
}
public override bool IsSubsetOf(IPermission target)
{
#if(debug)
Console.WriteLine ("************* Entering IsSubsetOf *********************");
#endif
if (target == null)
{
Console.WriteLine ("IsSubsetOf: target == null");
return false;
}
#if(debug)
Console.WriteLine ("This is = " + (( NameIdPermission)this).Name);
Console.WriteLine ("Target is " + (( NameIdPermission)target).m_Name);
#endif
try
{
NameIdPermission operand = ( NameIdPermission)target;
// The following check for unrestricted permission is only included as an example for
// permissions that allow the unrestricted state. It is of no value for this permission.
if (true == operand.m_Unrestricted)
{
return true;
}
else if (true == this.m_Unrestricted)
{
return false;
}
if (this.m_Name != null)
{
if (operand.m_Name == null) return false;
if (this.m_Name == "") return true;
}
if (this.m_Name.Equals (operand.m_Name))
{
return true;
}
else
{
// Check for wild card character '*'.
int i = operand.m_Name.LastIndexOf ("*");
if (i > 0)
{
string prefix = operand.m_Name.Substring (0, i);
if (this.m_Name.StartsWith (prefix))
{
return true;
}
}
}
return false;
}
catch (InvalidCastException)
{
throw new ArgumentException (String.Format ("Argument_WrongType", this.GetType ().FullName));
}
}
public override IPermission Intersect(IPermission target)
{
Console.WriteLine ("************* Entering Intersect *********************");
if (target == null)
{
return null;
}
#if(debug)
Console.WriteLine ("This is = " + (( NameIdPermission)this).Name);
Console.WriteLine ("Target is " + (( NameIdPermission)target).m_Name);
#endif
if (!VerifyType(target))
{
throw new ArgumentException (String.Format ("Argument is wrong type.", this.GetType ().FullName));
}
NameIdPermission operand = ( NameIdPermission)target;
if (operand.IsSubsetOf (this)) return operand.Copy ();
else if (this.IsSubsetOf (operand)) return this.Copy ();
else
return null;
}
public override IPermission Union(IPermission target)
{
#if(debug)
Console.WriteLine ("************* Entering Union *********************");
#endif
if (target == null)
{
return this;
}
#if(debug)
Console.WriteLine ("This is = " + (( NameIdPermission)this).Name);
Console.WriteLine ("Target is " + (( NameIdPermission)target).m_Name);
#endif
if (!VerifyType(target))
{
throw new ArgumentException (String.Format ("Argument_WrongType", this.GetType ().FullName));
}
NameIdPermission operand = ( NameIdPermission)target;
if (operand.IsSubsetOf (this)) return this.Copy ();
else if (this.IsSubsetOf (operand)) return operand.Copy ();
else
return null;
}
public override void FromXml(SecurityElement e)
{
// The following code for unrestricted permission is only included as an example for
// permissions that allow the unrestricted state. It is of no value for this permission.
String elUnrestricted = e.Attribute("Unrestricted");
if (null != elUnrestricted)
{
m_Unrestricted = bool.Parse(elUnrestricted);
return;
}
String elName = e.Attribute( "Name" );
m_Name = elName == null ? null : elName;
}
public override SecurityElement ToXml()
{
// Use the SecurityElement class to encode the permission to XML.
SecurityElement esd = new SecurityElement("IPermission");
String name = typeof( NameIdPermission).AssemblyQualifiedName;
esd.AddAttribute("class", name);
esd.AddAttribute("version", "1.0");
// The following code for unrestricted permission is only included as an example for
// permissions that allow the unrestricted state. It is of no value for this permission.
if (m_Unrestricted)
{
esd.AddAttribute("Unrestricted", true.ToString());
}
if (m_Name != null) esd.AddAttribute( "Name", m_Name );
return esd;
}
}
}
' This custom permission is intended only for the purposes of illustration.
' The following code shows how to create a custom permission that inherits
' from CodeAccessPermission. The code implements all required overrides.
' A wildcard character ('*') is implemented for the Name property.
Imports System.Security
Imports System.Security.Permissions
Imports System.IO
Imports System.Security.Policy
Imports System.Collections
<assembly: System.Reflection.AssemblyKeyFile("Key.snk")>
<assembly: System.Security.AllowPartiallyTrustedCallersAttribute()>
Namespace MyPermission
<Serializable()> _
Public NotInheritable Class NameIdPermission
Inherits CodeAccessPermission
Implements IUnrestrictedPermission
Private m_Name As String
Private m_Unrestricted As Boolean
Public Sub New(ByVal name As String)
m_name = name
End Sub
Public Sub New(ByVal state As PermissionState)
If state = PermissionState.None Then
m_name = ""
ElseIf state = PermissionState.Unrestricted Then
Throw New ArgumentException("Unrestricted state is not allowed for identity permissions.")
Else
Throw New ArgumentException("Invalid permission state.")
End If
End Sub
Public Property Name() As String
Get
Return m_name
End Get
Set(ByVal Value As String)
m_name = Value
End Set
End Property
Public Overrides Function Copy() As IPermission
Dim name As String
name = m_name
Return New NameIdPermission(name)
End Function 'Copy
Public Function IsUnrestricted() As Boolean Implements IUnrestrictedPermission.IsUnrestricted
' Always false, unrestricted state is not allowed.
Return m_Unrestricted
End Function
Private Function VerifyType(ByVal target As IPermission) As Boolean
Return TypeOf target Is NameIdPermission
End Function 'VerifyType
Public Overrides Function IsSubsetOf(ByVal target As IPermission) As Boolean
#If (Debug) Then
Console.WriteLine("************* Entering IsSubsetOf *********************")
#End If
If target Is Nothing Then
Console.WriteLine("IsSubsetOf: target == null")
Return False
End If
#If (Debug) Then
Console.WriteLine(("This is = " + CType(Me, NameIdPermission).Name))
Console.WriteLine(("Target is " + CType(target, NameIdPermission).m_name))
#End If
Try
Dim operand As NameIdPermission = CType(target, NameIdPermission)
' The following check for unrestricted permission is only included as an example for
' permissions that allow the unrestricted state. It is of no value for this permission.
If True = operand.m_Unrestricted Then
Return True
ElseIf True = Me.m_Unrestricted Then
Return False
End If
If Not (Me.m_name Is Nothing) Then
If operand.m_name Is Nothing Then
Return False
End If
If Me.m_name = "" Then
Return True
End If
End If
If Me.m_name.Equals(operand.m_name) Then
Return True
Else
' Check for wild card character '*'.
Dim i As Integer = operand.m_name.LastIndexOf("*")
If i > 0 Then
Dim prefix As String = operand.m_name.Substring(0, i)
If Me.m_name.StartsWith(prefix) Then
Return True
End If
End If
End If
Return False
Catch
Throw New ArgumentException(String.Format("Argument_WrongType", Me.GetType().FullName))
End Try
End Function
Public Overrides Function Intersect(ByVal target As IPermission) As IPermission
Console.WriteLine("************* Entering Intersect *********************")
If target Is Nothing Then
Return Nothing
End If
#If (Debug) Then
Console.WriteLine(("This is = " + CType(Me, NameIdPermission).Name))
Console.WriteLine(("Target is " + CType(target, NameIdPermission).m_name))
#End If
If Not VerifyType(target) Then
Throw New ArgumentException(String.Format("Argument is wrong type.", Me.GetType().FullName))
End If
Dim operand As NameIdPermission = CType(target, NameIdPermission)
If operand.IsSubsetOf(Me) Then
Return operand.Copy()
ElseIf Me.IsSubsetOf(operand) Then
Return Me.Copy()
Else
Return Nothing
End If
End Function 'Intersect
Public Overrides Function Union(ByVal target As IPermission) As IPermission
#If (Debug) Then
Console.WriteLine("************* Entering Union *********************")
#End If
If target Is Nothing Then
Return Me
End If
#If (Debug) Then
Console.WriteLine(("This is = " + CType(Me, NameIdPermission).Name))
Console.WriteLine(("Target is " + CType(target, NameIdPermission).m_name))
#End If
If Not VerifyType(target) Then
Throw New ArgumentException(String.Format("Argument_WrongType", Me.GetType().FullName))
End If
Dim operand As NameIdPermission = CType(target, NameIdPermission)
If operand.IsSubsetOf(Me) Then
Return Me.Copy()
ElseIf Me.IsSubsetOf(operand) Then
Return operand.Copy()
Else
Return Nothing
End If
End Function 'Union
Public Overrides Sub FromXml(ByVal e As SecurityElement)
' The following code for unrestricted permission is only included as an example for
' permissions that allow the unrestricted state. It is of no value for this permission.
Dim elUnrestricted As String = e.Attribute("Unrestricted")
If Nothing <> elUnrestricted Then
m_Unrestricted = Boolean.Parse(elUnrestricted)
Return
End If
Dim elName As String = e.Attribute("Name")
m_name = IIf(elName Is Nothing, Nothing, elName)
End Sub
Public Overrides Function ToXml() As SecurityElement
' Use the SecurityElement class to encode the permission to XML.
Dim esd As New SecurityElement("IPermission")
Dim name As String = GetType(NameIdPermission).AssemblyQualifiedName
esd.AddAttribute("class", name)
esd.AddAttribute("version", "1.0")
' The following code for unrestricted permission is only included as an example for
' permissions that allow the unrestricted state. It is of no value for this permission.
If m_Unrestricted Then
esd.AddAttribute("Unrestricted", True.ToString())
End If
If Not (m_Name Is Nothing) Then
esd.AddAttribute("Name", m_Name)
End If
Return esd
End Function 'ToXml
End Class
End Namespace
Comentarios
Precaución
La seguridad de acceso del código (CAS) ha quedado en desuso en todas las versiones de .NET Framework y .NET. Las versiones recientes de .NET no respetan las anotaciones de CAS y generan errores si se usan API relacionadas con CAS. Los desarrolladores deben buscar medios alternativos para realizar tareas de seguridad.
Los permisos de acceso al código usan un tutorial de pila para asegurarse de que a todos los autores de llamadas del código se les ha concedido un permiso. Si un objeto de permiso es null, se controla igual que un objeto de permiso con el estado PermissionState.None.
Normalmente, la pila de llamadas se representa como creciente, por lo que los métodos más altos en los métodos de llamada de la pila de llamadas se reducen en la pila de llamadas.
Los heredadores de la CodeAccessPermission clase deben tener plena confianza para funcionar correctamente como permisos que amplían la infraestructura de seguridad. Para determinar que los heredadores son de plena confianza, CodeAccessPermission emite un InheritanceDemand paratrue = ControlEvidence y .ControlPolicy = true
Notas a los implementadores
Cuando hereda de CodeAccessPermission, también debe implementar la IUnrestrictedPermission interfaz .
Los miembros siguientes CodeAccessPermission deben invalidarse: Copy(), Intersect(IPermission), IsSubsetOf(IPermission), ToXml(), FromXml(SecurityElement)y Union(IPermission).
También debe definir un constructor que tome como PermissionState único parámetro.
Debe aplicar el SerializableAttribute atributo a una clase que herede de CodeAccessPermission.
Constructores
| CodeAccessPermission() |
Obsoletos.
Inicializa una nueva instancia de la clase CodeAccessPermission. |
Métodos
| Assert() |
Obsoletos.
Declara que el código de llamada puede tener acceso al recurso protegido por una demanda de permiso a través del código que llama a este método, incluso si los autores de la llamada situados en una posición más alta de la pila no tienen permiso para tener acceso al recurso. El uso de Assert() puede crear problemas de seguridad. |
| Copy() |
Obsoletos.
Cuando se implementa mediante una clase derivada, crea y devuelve una copia idéntica del objeto de permiso actual. |
| Demand() |
Obsoletos.
Fuerza a un SecurityException en tiempo de ejecución si todos los autores de llamada situados en la parte superior de la pila de llamadas no disponen del permiso especificado por la instancia actual. |
| Deny() |
Obsoletos.
Obsoletos.
Impide que los autores de la llamada situados en la posición más alta de la pila de llamadas usen el código que llama a este método para tener acceso al recurso especificado por la instancia actual. |
| Equals(Object) |
Obsoletos.
Determina si el objeto CodeAccessPermission especificado es igual al objeto CodeAccessPermission actual. |
| Equals(Object) |
Obsoletos.
Determina si el objeto especificado es igual que el objeto actual. (Heredado de Object) |
| FromXml(SecurityElement) |
Obsoletos.
Cuando se invalida en una clase derivada, reconstruye un objeto de seguridad con un estado especificado a partir de codificación XML. |
| GetHashCode() |
Obsoletos.
Obtiene un código hash para el objeto CodeAccessPermission que es adecuado para su uso en algoritmos hash y estructuras de datos como una tabla hash. |
| GetHashCode() |
Obsoletos.
Sirve como la función hash predeterminada. (Heredado de Object) |
| GetType() |
Obsoletos.
Obtiene el Type de la instancia actual. (Heredado de Object) |
| Intersect(IPermission) |
Obsoletos.
Cuando se implementa mediante una clase derivada, se crea y se devuelve un permiso que es la intersección del permiso actual y el permiso especificado. |
| IsSubsetOf(IPermission) |
Obsoletos.
Cuando se implementa mediante una clase derivada, determina si el permiso actual es un subconjunto del permiso especificado. |
| MemberwiseClone() |
Obsoletos.
Crea una copia superficial del Object actual. (Heredado de Object) |
| PermitOnly() |
Obsoletos.
Impide que los llamadores situados más arriba en la pila de llamadas usen el código que llama a este método para tener acceso a todos los recursos excepto al recurso especificado por la instancia actual. |
| RevertAll() |
Obsoletos.
Provoca que se eliminen todos los reemplazos anteriores del marco actual y que ya no estén en vigor. |
| RevertAssert() |
Obsoletos.
Provoca que se elimine y deje de tener efecto cualquier Assert() anterior para el fotograma actual. |
| RevertDeny() |
Obsoletos.
Obsoletos.
Provoca que se elimine y deje de tener efecto cualquier Deny() anterior para el fotograma actual. |
| RevertPermitOnly() |
Obsoletos.
Provoca que se elimine y deje de tener efecto cualquier PermitOnly() anterior para el fotograma actual. |
| ToString() |
Obsoletos.
Crea y devuelve una representación de cadena del objeto de permiso actual. |
| ToXml() |
Obsoletos.
Cuando se invalida en una clase derivada, crea una codificación XML del objeto de seguridad y su estado actual. |
| Union(IPermission) |
Obsoletos.
Cuando se invalida en una clase derivada, crea un permiso que es la unión del permiso actual y el permiso especificado. |
Se aplica a
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