IPermission Interface
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 les méthodes implémentées par les types d'autorisation.
public interface class IPermission : System::Security::ISecurityEncodable
[System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public interface IPermission : System.Security.ISecurityEncodable
public interface IPermission : System.Security.ISecurityEncodable
[System.Runtime.InteropServices.ComVisible(true)]
public interface IPermission : System.Security.ISecurityEncodable
[<System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type IPermission = interface
interface ISecurityEncodable
type IPermission = interface
interface ISecurityEncodable
[<System.Runtime.InteropServices.ComVisible(true)>]
type IPermission = interface
interface ISecurityEncodable
Public Interface IPermission
Implements ISecurityEncodable
- Dérivé
- Attributs
- Implémente
Exemples
Cet exemple montre comment définir une classe d’autorisation à utiliser avec la sécurité d’accès au code. Toutes les interfaces d’autorisation nécessaires sont implémentées.
using namespace System;
using namespace System::Security;
using namespace System::Security::Permissions;
using namespace System::Reflection;
// Enumerated type for permission states.
[Serializable]
public enum class SoundPermissionState
{
NoSound = 0,
PlaySystemSounds = 1,
PlayAnySound = 2
};
// Derive from CodeAccessPermission to gain implementations of the following
// sealed IStackWalk methods: Assert, Demand, Deny, and PermitOnly.
// Implement the following abstract IPermission methods:
// Copy, Intersect, and IsSubSetOf.
// Implementing the Union method of the IPermission class is optional.
// Implement the following abstract ISecurityEncodable methods:
// FromXml and ToXml.
// Making the class 'sealed' is optional.
public ref class SoundPermission sealed : public CodeAccessPermission,
public IPermission, public IUnrestrictedPermission,
public ISecurityEncodable, public ICloneable
{
private:
bool specifiedAsUnrestricted;
private:
SoundPermissionState stateFlags;
// This constructor creates and initializes
// a permission with generic access.
public:
SoundPermission(PermissionState^ state)
{
specifiedAsUnrestricted = (state == PermissionState::Unrestricted);
}
// This constructor creates and initializes
// a permission with specific access.
public:
SoundPermission(SoundPermissionState flags)
{
if (flags < SoundPermissionState::NoSound ||
flags > SoundPermissionState::PlayAnySound)
{
throw gcnew ArgumentException("The value of \"flags\" is not" +
" valid for the SoundPermissionState enumerated type");
}
stateFlags = flags;
}
// For debugging, return the state of this object as XML.
public:
virtual String^ ToString() override
{
return ToXml()->ToString();
}
// Private method to cast (if possible) an IPermission to the type.
private:
SoundPermission^ VerifyTypeMatch(IPermission^ target)
{
if (GetType() != target->GetType())
{
throw gcnew ArgumentException(String::Format(
"The variable \"target\" must be of the {0} type",
GetType()->FullName));
}
return (SoundPermission^) target;
}
// This is the Private Clone helper method.
private:
SoundPermission^ Clone(bool specifiedAsUnrestricted,
SoundPermissionState flags)
{
SoundPermission^ soundPerm = (SoundPermission^) Clone();
soundPerm->specifiedAsUnrestricted = specifiedAsUnrestricted;
soundPerm->stateFlags = specifiedAsUnrestricted ?
SoundPermissionState::PlayAnySound : flags;
return soundPerm;
}
#pragma region IPermission^ Members
// Return a new object that contains the intersection
// of 'this' and 'target'.
public:
virtual IPermission^ Intersect(IPermission^ target) override
{
// If 'target' is null, return null.
if (target == nullptr)
{
return nullptr;
}
// Both objects must be the same type.
SoundPermission^ soundPerm = VerifyTypeMatch(target);
// If 'this' and 'target' are unrestricted,
// return a new unrestricted permission.
if (specifiedAsUnrestricted && soundPerm->specifiedAsUnrestricted)
{
return Clone(true, SoundPermissionState::PlayAnySound);
}
// Calculate the intersected permissions.
// If there are none, return null.
SoundPermissionState minimumPermission = (SoundPermissionState)
Math::Min((int) stateFlags, (int) soundPerm->stateFlags);
if ((int)minimumPermission == 0)
{
return nullptr;
}
// Return a new object with the intersected permission value.
return Clone(false, minimumPermission);
}
// Called by the Demand method: returns true
// if 'this' is a subset of 'target'.
public:
virtual bool IsSubsetOf(IPermission^ target) override
{
// If 'target' is null and this permission allows nothing,
// return true.
if (target == nullptr)
{
return (int)stateFlags == 0;
}
// Both objects must be the same type.
SoundPermission^ soundPerm = VerifyTypeMatch(target);
// Return true if the permissions of 'this'
// is a subset of 'target'.
return stateFlags <= soundPerm->stateFlags;
}
// Return a new object that matches 'this' object's permissions.
public:
virtual IPermission^ Copy () override sealed
{
return (IPermission^) Clone();
}
// Return a new object that contains the union of 'this' and 'target'.
// Note: You do not have to implement this method.
// If you do not, the version
// in CodeAccessPermission does this:
// 1. If target is not null, a NotSupportedException is thrown.
// 2. If target is null, then Copy is called and
// the new object is returned.
public:
virtual IPermission^ Union(IPermission^ target) override
{
// If 'target' is null, then return a copy of 'this'.
if (target == nullptr)
{
return Copy();
}
// Both objects must be the same type.
SoundPermission^ soundPerm = VerifyTypeMatch(target);
// If 'this' or 'target' are unrestricted,
// return a new unrestricted permission.
if (specifiedAsUnrestricted || soundPerm->specifiedAsUnrestricted)
{
return Clone(true, SoundPermissionState::PlayAnySound);
}
// Return a new object with the calculated, unioned permission value.
return Clone(false, (SoundPermissionState)
Math::Max((int) stateFlags, (int) soundPerm->stateFlags));
}
#pragma endregion
#pragma region ISecurityEncodable^ Members
// Populate the permission's fields from XML.
public:
virtual void FromXml(SecurityElement^ element) override
{
specifiedAsUnrestricted = false;
stateFlags = (SoundPermissionState)0;
// If XML indicates an unrestricted permission,
// make this permission unrestricted.
String^ attributeString =
(String^) element->Attributes["Unrestricted"];
if (attributeString != nullptr)
{
specifiedAsUnrestricted = Convert::ToBoolean(attributeString);
if (specifiedAsUnrestricted)
{
stateFlags = SoundPermissionState::PlayAnySound;
}
}
// If XML indicates a restricted permission, parse the flags.
if (!specifiedAsUnrestricted)
{
attributeString = (String^) element->Attributes["Flags"];
if (attributeString != nullptr)
{
stateFlags = (SoundPermissionState) Convert::ToInt32(
Enum::Parse(SoundPermissionState::typeid,
attributeString, true));
}
}
}
// Produce XML from the permission's fields.
public:
virtual SecurityElement^ ToXml() override
{
// These first three lines create an element with the required format.
SecurityElement^ element = gcnew SecurityElement("IPermission");
// Replace the double quotation marks ()
// with single quotation marks ()
// to remain XML compliant when the culture is not neutral.
element->AddAttribute("class",
GetType()->AssemblyQualifiedName->Replace('\"', '\''));
element->AddAttribute("version", "1");
if (!specifiedAsUnrestricted)
{
element->AddAttribute("Flags",
Enum::Format(SoundPermissionState::typeid, stateFlags, "G"));
}
else
{
element->AddAttribute("Unrestricted", "true");
}
return element;
}
#pragma endregion
#pragma region IUnrestrictedPermission^ Members
// Returns true if permission is effectively unrestricted.
public:
virtual bool IsUnrestricted()
{
// This means that the object is unrestricted at runtime.
return stateFlags == SoundPermissionState::PlayAnySound;
}
#pragma endregion
#pragma region ICloneable^ Members
// Return a copy of the permission.
public:
virtual Object^ Clone()
{
return MemberwiseClone();
}
#pragma endregion
};
using System;
using System.Security;
using System.Security.Permissions;
using System.Reflection;
// Enumerated type for permission states.
[Serializable]
public enum SoundPermissionState
{
NoSound = 0,
PlaySystemSounds = 1,
PlayAnySound = 2
}
// Derive from CodeAccessPermission to gain implementations of the following
// sealed IStackWalk methods: Assert, Demand, Deny, and PermitOnly.
// Implement the following abstract IPermission methods: Copy, Intersect, and IsSubSetOf.
// Implementing the Union method of the IPermission class is optional.
// Implement the following abstract ISecurityEncodable methods: FromXml and ToXml.
// Making the class 'sealed' is optional.
public sealed class SoundPermission : CodeAccessPermission, IPermission,
IUnrestrictedPermission, ISecurityEncodable, ICloneable
{
private Boolean m_specifiedAsUnrestricted = false;
private SoundPermissionState m_flags = SoundPermissionState.NoSound;
// This constructor creates and initializes a permission with generic access.
public SoundPermission(PermissionState state)
{
m_specifiedAsUnrestricted = (state == PermissionState.Unrestricted);
}
// This constructor creates and initializes a permission with specific access.
public SoundPermission(SoundPermissionState flags)
{
if (!Enum.IsDefined(typeof(SoundPermissionState), flags))
throw new ArgumentException
("flags value is not valid for the SoundPermissionState enuemrated type");
m_specifiedAsUnrestricted = false;
m_flags = flags;
}
// For debugging, return the state of this object as XML.
public override String ToString() { return ToXml().ToString(); }
// Private method to cast (if possible) an IPermission to the type.
private SoundPermission VerifyTypeMatch(IPermission target)
{
if (GetType() != target.GetType())
throw new ArgumentException(String.Format("target must be of the {0} type",
GetType().FullName));
return (SoundPermission)target;
}
// This is the Private Clone helper method.
private SoundPermission Clone(Boolean specifiedAsUnrestricted, SoundPermissionState flags)
{
SoundPermission soundPerm = (SoundPermission)Clone();
soundPerm.m_specifiedAsUnrestricted = specifiedAsUnrestricted;
soundPerm.m_flags = specifiedAsUnrestricted ? SoundPermissionState.PlayAnySound : m_flags;
return soundPerm;
}
#region IPermission Members
// Return a new object that contains the intersection of 'this' and 'target'.
public override IPermission Intersect(IPermission target)
{
// If 'target' is null, return null.
if (target == null) return null;
// Both objects must be the same type.
SoundPermission soundPerm = VerifyTypeMatch(target);
// If 'this' and 'target' are unrestricted, return a new unrestricted permission.
if (m_specifiedAsUnrestricted && soundPerm.m_specifiedAsUnrestricted)
return Clone(true, SoundPermissionState.PlayAnySound);
// Calculate the intersected permissions. If there are none, return null.
SoundPermissionState val = (SoundPermissionState)
Math.Min((Int32)m_flags, (Int32)soundPerm.m_flags);
if (val == 0) return null;
// Return a new object with the intersected permission value.
return Clone(false, val);
}
// Called by the Demand method: returns true if 'this' is a subset of 'target'.
public override Boolean IsSubsetOf(IPermission target)
{
// If 'target' is null and this permission allows nothing, return true.
if (target == null) return m_flags == 0;
// Both objects must be the same type.
SoundPermission soundPerm = VerifyTypeMatch(target);
// Return true if the permissions of 'this' is a subset of 'target'.
return m_flags <= soundPerm.m_flags;
}
// Return a new object that matches 'this' object's permissions.
public sealed override IPermission Copy()
{
return (IPermission)Clone();
}
// Return a new object that contains the union of 'this' and 'target'.
// Note: You do not have to implement this method. If you do not, the version
// in CodeAccessPermission does this:
// 1. If target is not null, a NotSupportedException is thrown.
// 2. If target is null, then Copy is called and the new object is returned.
public override IPermission Union(IPermission target)
{
// If 'target' is null, then return a copy of 'this'.
if (target == null) return Copy();
// Both objects must be the same type.
SoundPermission soundPerm = VerifyTypeMatch(target);
// If 'this' or 'target' are unrestricted, return a new unrestricted permission.
if (m_specifiedAsUnrestricted || soundPerm.m_specifiedAsUnrestricted)
return Clone(true, SoundPermissionState.PlayAnySound);
// Return a new object with the calculated, unioned permission value.
return Clone(false, (SoundPermissionState)
Math.Max((Int32)m_flags, (Int32)soundPerm.m_flags));
}
#endregion
#region ISecurityEncodable Members
// Populate the permission's fields from XML.
public override void FromXml(SecurityElement e)
{
m_specifiedAsUnrestricted = false;
m_flags = 0;
// If XML indicates an unrestricted permission, make this permission unrestricted.
String s = (String)e.Attributes["Unrestricted"];
if (s != null)
{
m_specifiedAsUnrestricted = Convert.ToBoolean(s);
if (m_specifiedAsUnrestricted)
m_flags = SoundPermissionState.PlayAnySound;
}
// If XML indicates a restricted permission, parse the flags.
if (!m_specifiedAsUnrestricted)
{
s = (String)e.Attributes["Flags"];
if (s != null)
{
m_flags = (SoundPermissionState)
Convert.ToInt32(Enum.Parse(typeof(SoundPermission), s, true));
}
}
}
// Produce XML from the permission's fields.
public override SecurityElement ToXml()
{
// These first three lines create an element with the required format.
SecurityElement e = new SecurityElement("IPermission");
// Replace the double quotation marks ("") with single quotation marks ('')
// to remain XML compliant when the culture is not neutral.
e.AddAttribute("class", GetType().AssemblyQualifiedName.Replace('\"', '\''));
e.AddAttribute("version", "1");
if (!m_specifiedAsUnrestricted)
e.AddAttribute("Flags", Enum.Format(typeof(SoundPermissionState), m_flags, "G"));
else
e.AddAttribute("Unrestricted", "true");
return e;
}
#endregion
#region IUnrestrictedPermission Members
// Returns true if permission is effectively unrestricted.
public Boolean IsUnrestricted()
{
// This means that the object is unrestricted at runtime.
return m_flags == SoundPermissionState.PlayAnySound;
}
#endregion
#region ICloneable Members
// Return a copy of the permission.
public Object Clone() { return MemberwiseClone(); }
#endregion
}
Imports System.Security
Imports System.Security.Permissions
Imports System.Reflection
' Enumerated type for permission states.
<Serializable()> _
Public Enum SoundPermissionState
NoSound = 0
PlaySystemSounds = 1
PlayAnySound = 2
End Enum 'SoundPermissionState
' Derive from CodeAccessPermission to gain implementations of the following
' sealed IStackWalk methods: Assert, Demand, Deny, and PermitOnly.
' Implement the following abstract IPermission methods: Copy, Intersect, and IsSubSetOf.
' Implementing the Union method of the IPermission class is optional.
' Implement the following abstract ISecurityEncodable methods: FromXml and ToXml.
' Making the class 'sealed' is optional.
NotInheritable Public Class SoundPermission
Inherits CodeAccessPermission
Implements IPermission, IUnrestrictedPermission, ISecurityEncodable, ICloneable
Private m_specifiedAsUnrestricted As [Boolean] = False
Private m_flags As SoundPermissionState = SoundPermissionState.NoSound
' This constructor creates and initializes a permission with generic access.
Public Sub New(ByVal state As PermissionState)
m_specifiedAsUnrestricted = state = PermissionState.Unrestricted
End Sub
' This constructor creates and initializes a permission with specific access.
Public Sub New(ByVal flags As SoundPermissionState)
If Not [Enum].IsDefined(GetType(SoundPermissionState), flags) Then
Throw New ArgumentException("flags value is not valid for the SoundPermissionState enuemrated type")
End If
m_specifiedAsUnrestricted = False
m_flags = flags
End Sub
' For debugging, return the state of this object as XML.
Public Overrides Function ToString() As String
Return ToXml().ToString()
End Function 'ToString
' Private method to cast (if possible) an IPermission to the type.
Private Function VerifyTypeMatch(ByVal target As IPermission) As SoundPermission
If [GetType]() <> target.GetType() Then
Throw New ArgumentException(String.Format("target must be of the {0} type", [GetType]().FullName))
End If
Return CType(target, SoundPermission)
End Function 'VerifyTypeMatch
' This is the Private Clone helper method.
Private Function Clone(ByVal specifiedAsUnrestricted As [Boolean], ByVal flags As SoundPermissionState) As SoundPermission
Dim soundPerm As SoundPermission = CType(Clone(), SoundPermission)
soundPerm.m_specifiedAsUnrestricted = specifiedAsUnrestricted
soundPerm.m_flags = IIf(specifiedAsUnrestricted, SoundPermissionState.PlayAnySound, m_flags)
Return soundPerm
End Function 'Clone
#Region "IPermission Members"
' Return a new object that contains the intersection of 'this' and 'target'.
Public Overrides Function Intersect(ByVal target As IPermission) As IPermission
' If 'target' is null, return null.
If target Is Nothing Then
Return Nothing
End If
' Both objects must be the same type.
Dim soundPerm As SoundPermission = VerifyTypeMatch(target)
' If 'this' and 'target' are unrestricted, return a new unrestricted permission.
If m_specifiedAsUnrestricted AndAlso soundPerm.m_specifiedAsUnrestricted Then
Return Clone(True, SoundPermissionState.PlayAnySound)
End If
' Calculate the intersected permissions. If there are none, return null.
Dim val As SoundPermissionState = CType(Math.Min(CType(m_flags, Int32), CType(soundPerm.m_flags, Int32)), SoundPermissionState)
If val = 0 Then
Return Nothing
End If
' Return a new object with the intersected permission value.
Return Clone(False, val)
End Function 'Intersect
' Called by the Demand method: returns true if 'this' is a subset of 'target'.
Public Overrides Function IsSubsetOf(ByVal target As IPermission) As [Boolean]
' If 'target' is null and this permission allows nothing, return true.
If target Is Nothing Then
Return m_flags = 0
End If
' Both objects must be the same type.
Dim soundPerm As SoundPermission = VerifyTypeMatch(target)
' Return true if the permissions of 'this' is a subset of 'target'.
Return m_flags <= soundPerm.m_flags
End Function 'IsSubsetOf
' Return a new object that matches 'this' object's permissions.
Public Overrides Function Copy() As IPermission
Return CType(Clone(), IPermission)
End Function 'Copy
' Return a new object that contains the union of 'this' and 'target'.
' Note: You do not have to implement this method. If you do not, the version
' in CodeAccessPermission does this:
' 1. If target is not null, a NotSupportedException is thrown.
' 2. If target is null, then Copy is called and the new object is returned.
Public Overrides Function Union(ByVal target As IPermission) As IPermission
' If 'target' is null, then return a copy of 'this'.
If target Is Nothing Then
Return Copy()
End If
' Both objects must be the same type.
Dim soundPerm As SoundPermission = VerifyTypeMatch(target)
' If 'this' or 'target' are unrestricted, return a new unrestricted permission.
If m_specifiedAsUnrestricted OrElse soundPerm.m_specifiedAsUnrestricted Then
Return Clone(True, SoundPermissionState.PlayAnySound)
End If
' Return a new object with the calculated, unioned permission value.
Return Clone(False, CType(Math.Max(CType(m_flags, Int32), CType(soundPerm.m_flags, Int32)), SoundPermissionState))
End Function 'Union
#End Region
#Region "ISecurityEncodable Members"
' Populate the permission's fields from XML.
Public Overrides Sub FromXml(ByVal e As SecurityElement)
m_specifiedAsUnrestricted = False
m_flags = 0
' If XML indicates an unrestricted permission, make this permission unrestricted.
Dim s As String = CStr(e.Attributes("Unrestricted"))
If Not (s Is Nothing) Then
m_specifiedAsUnrestricted = Convert.ToBoolean(s)
If m_specifiedAsUnrestricted Then
m_flags = SoundPermissionState.PlayAnySound
End If
End If
' If XML indicates a restricted permission, parse the flags.
If Not m_specifiedAsUnrestricted Then
s = CStr(e.Attributes("Flags"))
If Not (s Is Nothing) Then
m_flags = CType(Convert.ToInt32([Enum].Parse(GetType(SoundPermission), s, True)), SoundPermissionState)
End If
End If
End Sub
' Produce XML from the permission's fields.
Public Overrides Function ToXml() As SecurityElement
' These first three lines create an element with the required format.
Dim e As New SecurityElement("IPermission")
' Replace the double quotation marks ("") with single quotation marks ('')
' to remain XML compliant when the culture is not neutral.
e.AddAttribute("class", [GetType]().AssemblyQualifiedName.Replace(ControlChars.Quote, "'"c))
e.AddAttribute("version", "1")
If Not m_specifiedAsUnrestricted Then
e.AddAttribute("Flags", [Enum].Format(GetType(SoundPermissionState), m_flags, "G"))
Else
e.AddAttribute("Unrestricted", "true")
End If
Return e
End Function 'ToXml
#End Region
#Region "IUnrestrictedPermission Members"
' Returns true if permission is effectively unrestricted.
Public Function IsUnrestricted() As [Boolean] Implements IUnrestrictedPermission.IsUnrestricted
' This means that the object is unrestricted at runtime.
Return m_flags = SoundPermissionState.PlayAnySound
End Function 'IsUnrestricted
#End Region
#Region "ICloneable Members"
' Return a copy of the permission.
Public Function Clone() As [Object] Implements System.ICloneable.Clone
Return MemberwiseClone()
End Function 'Clone
#End Region
End Class
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 dans le Common Language Runtime sont des objets qui décrivent des ensembles d’opérations qui peuvent être sécurisées pour des ressources spécifiées. Un objet d’autorisation décrit les opérations ou l’accès soumis à un contrôle de sécurité ; il ne représente pas l’accès ou le droit d’effectuer des opérations. Les autorisations sont utilisées par le code d’application et le système de sécurité .NET Framework des manières suivantes :
Le code demande les autorisations dont il a besoin pour s’exécuter.
La stratégie de système de sécurité accorde des autorisations pour l’exécution du code.
Le code exige que l’appel du code dispose d’une autorisation.
Le code remplace la pile de sécurité à l’aide de l’option assert/deny/permit-only.
Notes
Si vous écrivez une nouvelle autorisation, vous devez implémenter cette interface dans votre classe.
Important
Une autorisation est accessible par plusieurs threads. Lorsque vous implémentez cette interface, vous devez garantir que les implémentations de la IsSubsetOfméthode , Intersect, Unionet Copy sont thread safe.
Méthodes
Copy() |
Obsolète.
Crée et retourne une copie identique de l’autorisation actuelle. |
Demand() |
Obsolète.
Lève une SecurityException au moment de l'exécution si les conditions de sécurité ne sont pas réunies. |
FromXml(SecurityElement) |
Obsolète.
Reconstruit un objet de sécurité avec un état spécifié à partir d’un encodage XML. (Hérité de ISecurityEncodable) |
Intersect(IPermission) |
Obsolète.
Crée et retourne une autorisation qui constitue l’intersection entre l’autorisation actuelle et l’autorisation spécifiée. |
IsSubsetOf(IPermission) |
Obsolète.
Détermine si l’autorisation actuelle est un sous-ensemble de l’autorisation spécifiée. |
ToXml() |
Obsolète.
Crée un codage XML de l’objet de sécurité et de son état actuel. (Hérité de ISecurityEncodable) |
Union(IPermission) |
Obsolète.
Crée une autorisation qui est l’union de l’autorisation actuelle et de l’autorisation spécifiée. |