CodeAccessPermission Classe
Définition
Important
Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.
Attention
Code Access Security is not supported or honored by the runtime.
Définit la structure sous-jacente de toutes les autorisations d’accès au code.
public ref class CodeAccessPermission abstract : System::Security::IPermission, System::Security::IStackWalk
public 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.IStackWalk
type 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 IStackWalk
Public MustInherit Class CodeAccessPermission
Implements IPermission, IStackWalk
- Héritage
-
CodeAccessPermission
- Dérivé
- Attributs
- Implémente
Exemples
L’exemple de code suivant montre une autorisation dérivée de la CodeAccessPermission classe .
//#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
Remarques
Attention
La sécurité d’accès du code (CAS) a été déconseillée dans toutes les versions du .NET Framework et de .NET. Les versions récentes de .NET ne respectent pas les annotations CAS et produisent des erreurs si les API liées à CAS sont utilisées. Les développeurs doivent chercher d’autres moyens pour accomplir les tâches liées à la sécurité.
Les autorisations d’accès au code utilisent une procédure de pile pour s’assurer que tous les appelants du code ont reçu une autorisation. Si un objet d’autorisation est null
, il est géré de la même façon qu’un objet d’autorisation avec l’état PermissionState.None.
La pile des appels est généralement représentée comme augmentant vers le bas, de sorte que les méthodes plus élevées dans la pile d’appels d’appels sont inférieures dans la pile des appels.
Les héritiers de la CodeAccessPermission classe doivent bénéficier d’une confiance totale pour fonctionner correctement en tant qu’autorisations étendant l’infrastructure de sécurité. Pour déterminer que les héritiers sont entièrement approuvés, CodeAccessPermission émet un InheritanceDemand pour ControlEvidence = true
et ControlPolicy = true
.
Notes pour les responsables de l’implémentation
Lorsque vous héritez de CodeAccessPermission, vous devez également implémenter l’interface IUnrestrictedPermission .
Les membres suivants CodeAccessPermission doivent être remplacés : Copy(), Intersect(IPermission), IsSubsetOf(IPermission), ToXml(), FromXml(SecurityElement)et Union(IPermission).
Vous devez également définir un constructeur qui prend un PermissionState comme seul paramètre.
Vous devez appliquer l’attribut SerializableAttribute à une classe qui hérite de CodeAccessPermission.
Constructeurs
CodeAccessPermission() |
Obsolète.
Initialise une nouvelle instance de la classe CodeAccessPermission. |
Méthodes
Assert() |
Obsolète.
Déclare que le code appelant peut accéder à la ressource protégée par une demande d’autorisation via le code qui appelle cette méthode, même si les appelants situés plus haut dans la pile n’ont pas reçu l’autorisation d’accéder à la ressource. L’utilisation de Assert() peut créer des problèmes de sécurité. |
Copy() |
Obsolète.
En cas d’implémentation par une classe dérivée, crée et retourne une copie identique de l’objet d’autorisation actuel. |
Demand() |
Obsolète.
Force un SecurityException au moment de l’exécution si tous les appelants figurant plus haut dans la pile des appels ne disposent pas des autorisations spécifiées par l’instance actuelle. |
Deny() |
Obsolète.
Obsolète.
Empêche les appelants plus hauts dans la pile des appels d’utiliser le code qui appelle cette méthode pour accéder à la ressource spécifiée par l’instance actuelle. |
Equals(Object) |
Obsolète.
Détermine si l'objet CodeAccessPermission spécifié est égal à CodeAccessPermission en cours. |
Equals(Object) |
Obsolète.
Détermine si l'objet spécifié est égal à l'objet actuel. (Hérité de Object) |
FromXml(SecurityElement) |
Obsolète.
En cas de remplacement dans une classe dérivée, reconstruit un objet de sécurité avec un état spécifié à partir d’un encodage XML. |
GetHashCode() |
Obsolète.
Obtient un code de hachage pour l’objet CodeAccessPermission qui peut être utilisé dans des structures de données et des algorithmes de hachage, comme une table de hachage. |
GetHashCode() |
Obsolète.
Fait office de fonction de hachage par défaut. (Hérité de Object) |
GetType() |
Obsolète.
Obtient le Type de l'instance actuelle. (Hérité de Object) |
Intersect(IPermission) |
Obsolète.
Lors de l'implémentation par une classe dérivée, crée et retourne une autorisation qui est l'intersection de l'autorisation en cours et de l'autorisation spécifiée. |
IsSubsetOf(IPermission) |
Obsolète.
Lors de l'implémentation par une classe dérivée, détermine si l'autorisation en cours est un sous-ensemble de l'autorisation spécifiée. |
MemberwiseClone() |
Obsolète.
Crée une copie superficielle du Object actuel. (Hérité de Object) |
PermitOnly() |
Obsolète.
Empêche les appelants plus hauts dans la pile des appels d’utiliser le code qui appelle cette méthode pour accéder à toutes les ressources à l’exception de la ressource spécifiée par l’instance actuelle. |
RevertAll() |
Obsolète.
Entraîne la suppression définitive de toutes les substitutions antérieures pour le frame actuel. |
RevertAssert() |
Obsolète.
Entraîne la suppression définitive de tout Assert() antérieur pour le frame actuel. |
RevertDeny() |
Obsolète.
Obsolète.
Entraîne la suppression définitive de tout Deny() antérieur pour le frame actuel. |
RevertPermitOnly() |
Obsolète.
Entraîne la suppression définitive de tout PermitOnly() antérieur pour le frame actuel. |
ToString() |
Obsolète.
Crée et retourne une chaîne représentant l’objet d’autorisation actuel. |
ToXml() |
Obsolète.
En cas de substitution dans une classe dérivée, crée un encodage XML de l’objet de sécurité et de son état actuel. |
Union(IPermission) |
Obsolète.
Lors de son remplacement dans une classe dérivée, crée une autorisation qui est l’union de l’autorisation actuelle et de l’autorisation spécifiée. |