PermissionSetAttribute Classe

Definição

Namespace:

System.Security.Permissions

Assembly:

System.Security.Permissions.dll

Pacote:

System.Security.Permissions v9.0.0-rc.2.24473.5

Origem:

PermissionSetAttribute.cs

Cuidado

Code Access Security is not supported or honored by the runtime.

Permite que as ações de segurança para um PermissionSet sejam aplicadas ao código usando a segurança declarativa. Essa classe não pode ser herdada.

public ref class PermissionSetAttribute sealed : System::Security::Permissions::CodeAccessSecurityAttribute

[System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)]
[System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public sealed class PermissionSetAttribute : System.Security.Permissions.CodeAccessSecurityAttribute

[<System.AttributeUsage(System.AttributeTargets.Assembly | System.AttributeTargets.Class | System.AttributeTargets.Constructor | System.AttributeTargets.Method | System.AttributeTargets.Struct, AllowMultiple=true, Inherited=false)>]
[<System.Obsolete("Code Access Security is not supported or honored by the runtime.", DiagnosticId="SYSLIB0003", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type PermissionSetAttribute = class
    inherit CodeAccessSecurityAttribute

Public NotInheritable Class PermissionSetAttribute
Inherits CodeAccessSecurityAttribute

Herança

Object

Attribute

SecurityAttribute

CodeAccessSecurityAttribute

PermissionSetAttribute

Atributos

AttributeUsageAttribute ObsoleteAttribute

Exemplos

O exemplo a seguir mostra o uso da PermissionSetAttribute Classe .

// The #define statement for BuildFile must be included the first time this sample is run.  
// This causes the sample to create a file named 'LocalIntranet.xml' in the c:\temp folder.  
// After creating the LocalInternet.xml file, comment out the #define statement and rerun 
// the sample to demonstrate the use of the permission set attribute.
#define BuildFile
using System;
using System.Security;
using System.Security.Permissions;
using System.Security.Policy;
using System.Collections;
using System.IO;

namespace PermissionSetAttributeDemo
{
    class Class1
    {		
        [STAThread]
        static void Main(string[] args)
        {
            // Run this sample with the BuildFile symbol defined to create the required file, then
            // comment out the #define statement to demonstrate the use of the attribute.
#if(BuildFile)
            using (StreamWriter sw = new StreamWriter("c:\\temp\\LocalIntranet.xml")) 
            {
                sw.WriteLine(GetNamedPermissionSet("LocalIntranet"));
                sw.Close();
            }
#endif
#if(!BuildFile)
            ReadFile1();
            ReadFile2();
            ReadFile3();
            Console.WriteLine("Press the Enter key to exit.");
            Console.Read();
#endif
        }
#if(!BuildFile)
        // Read the LocalIntranet.xml file.
        static void ReadFile1()
        {
            try
            {
                Console.WriteLine("Attempting to read a file using the FullTrust permission set.");
                using (StreamReader sr = new StreamReader("c:\\temp\\LocalIntranet.xml")) 
                {
                    string permissionSet = sr.ReadToEnd();
                    sr.Close();
                }
                Console.WriteLine("The file was successfully read.");
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
        [PermissionSetAttribute(SecurityAction.PermitOnly, File = "c:\\temp\\LocalIntranet.xml")]
            // Read the file with the specified security action on the file path.
        static void ReadFile2()
        {
            try
            {
                Console.WriteLine("Attempting to read a file using the LocalIntranet permission set.");
                using (StreamReader sr = new StreamReader("c:\\temp\\LocalIntranet.xml")) 
                {
                    string permissionSet = sr.ReadToEnd();
                    sr.Close();
                }
                Console.WriteLine("The file was successfully read.");
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
        [PermissionSetAttribute(SecurityAction.PermitOnly, Name = "LocalIntranet")]
            // Read the file with the specified security action on the permission set.
        static void ReadFile3()
        {
            try
            {
                Console.WriteLine("\nSecond attempt to read a file using " + 
                    "the LocalIntranet permission set.");
                using (StreamReader sr = new StreamReader("c:\\temp\\LocalIntranet.xml")) 
                {
                    string permissionSet = sr.ReadToEnd();
                    sr.Close();
                }
                Console.WriteLine("The file was successfully read.");
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
            }
        }
#endif
        // Locate the named permission set at the Machine level and return it as a string value.
        private static string GetNamedPermissionSet(string name)
        {
            IEnumerator policyEnumerator = SecurityManager.PolicyHierarchy();
            // Move through the policy levels to the Machine Level.
            while(policyEnumerator.MoveNext())
            {
                PolicyLevel currentLevel = (PolicyLevel)policyEnumerator.Current;
                if(currentLevel.Label == "Machine")
                {
                    // Iterate through the permission sets at the Machine level.
                    IList namedPermissions = currentLevel.NamedPermissionSets;
                    IEnumerator namedPermission = namedPermissions.GetEnumerator();
                    // Locate the named permission set.
                    while(namedPermission.MoveNext())
                    {
                        if(((NamedPermissionSet)namedPermission.Current).Name == name)
                        {
                            return ((NamedPermissionSet)namedPermission.Current).ToString();
                        }
                    }
                }
            }
            return null;
        }
    }
}
//
// This sample produces the following output:
//
// File created at c:\temp\LocalIntranet.xml
// Uncomment the BuildFile=false line and run the sample again.
//
// This sample completed successfully; press Exit to continue.
//
//
// The second time the sample is ran (without DEBUG flag):
//
// Attempting to read a file using the FullTrust permission set.
// The file was successfully read.
// Attempting to read a file using the LocalIntranet permission set.
// Request for the permission of type
// System.Security.Permissions.FileIOPermission, mscorlib, Version=1.0.5000.0,
// Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.
//
// Second attempt to read a file using the LocalIntranet permission set.
// Request for the permission of type System.Security.Permissions.FileIOPermission,
// mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
// failed.
// Press the Enter key to exit.

' The #Const BuildFile = True statement must be active the first time this
' sample is run. This causes the sample to create a file named
' 'LocalIntranet.xml' in the c:\temp folder. After creating the
' LocalInternet.xml file, comment out the #Const BUILDFILE = True statement,
' uncomment the #Const BUILDFILE = False statement, and rerun the sample to
' demonstrate the use of the permission set attribute.
Imports System.Security
Imports System.Security.Permissions
Imports System.Security.Policy
Imports System.Collections
Imports System.IO

#Const BUILDFILE = True
'#Const BUILDFILE = False

Public Class Form1
    Inherits System.Windows.Forms.Form

    ' Event handler for Run button.
    <STAThread()> _
        Private Sub Button1_Click( _
            ByVal sender As System.Object, _
            ByVal e As System.EventArgs) Handles Button1.Click

        tbxOutput.Cursor = Cursors.WaitCursor
        tbxOutput.Text = ""

        Dim xmlFilePath As String
        xmlFilePath = "c:\temp\LocalIntranet.xml"

        ' Run this sample with the BuildFile symbol defined to create the
        ' required file, then comment out the /define statement to demonstrate
        ' the use of the attribute.
#If (BUILDFILE) Then
        Dim sw As New StreamWriter(xmlFilePath)
        Try
            sw.WriteLine(GetNamedPermissionSet("LocalIntranet"))
            WriteLine("File created at " + xmlFilePath)
            WriteLine("Uncomment the BuildFile=false line and " + _
                "run the sample again.")
        Finally
            sw.Close()
        End Try
#End If

#If (Not BUILDFILE) Then
        ReadFile1()
        ReadFile2()
        ReadFile3()
#End If
        ' Align interface and conclude application.
        WriteLine(vbCrLf + "This sample completed successfully;" + _
            " press Exit to continue.")

        ' Reset the cursor.
        tbxOutput.Cursor = Cursors.Default
    End Sub

#If (Not BUILDFILE) Then
    ' Read the LocalIntranet.xml file.
    Private Sub ReadFile1()
        Try
            WriteLine("Attempting to read a file using the FullTrust " + _
                "permission set.")
            Dim sr As New StreamReader("c:\temp\LocalIntranet.xml")
            Try
                Dim permissionSet As String = sr.ReadToEnd()
            Finally
                sr.Close()
            End Try
            WriteLine("The file was successfully read.")
        Catch e As Exception
            WriteLine(e.Message)
        End Try
    End Sub

    <System.Security.Permissions.PermissionSetAttribute( _
        SecurityAction.PermitOnly, _
        File:="c:\temp\LocalIntranet.xml")> _
    Private Sub ReadFile2()
        ' Read the file with the specified security action on the file path.
        Try
            WriteLine("Attempting to read a file using the LocalIntranet " + _
                "permission set.")
            Dim sr As New StreamReader("c:\temp\LocalIntranet.xml")
            Try
                Dim permissionSet As String = sr.ReadToEnd()
            Finally
                sr.Close()
            End Try
            WriteLine("The file was successfully read.")
        Catch e As Exception
            WriteLine(e.Message)
        End Try
    End Sub

    <System.Security.Permissions.PermissionSetAttribute( _
        SecurityAction.PermitOnly, _
        Name:="LocalIntranet")> _
    Private Sub ReadFile3()
        ' Read the file with the specified security action on the
        ' permission set.
        Try
            WriteLine("Second attempt to read a file using the " + _
                "LocalIntranet permission set.")
            Dim sr As New StreamReader("c:\temp\LocalIntranet.xml")
            Try
                Dim permissionSet As String = sr.ReadToEnd()
            Finally
                sr.Close()
            End Try
            WriteLine("The file was successfully read.")
        Catch e As Exception
            WriteLine(e.Message)
        End Try
    End Sub
#End If

    ' Locate the named permission set at the Machine level and return it as
    ' a string value.
    Private Shared Function GetNamedPermissionSet( _
        ByVal name As String) As String

        Dim policyEnumerator As IEnumerator
        policyEnumerator = SecurityManager.PolicyHierarchy()

        ' Move through the policy levels to the Machine Level.
        While policyEnumerator.MoveNext()
            Dim currentLevel As PolicyLevel
            currentLevel = CType(policyEnumerator.Current, PolicyLevel)
            If currentLevel.Label = "Machine" Then
                ' Iterate through the permission sets at the Machine level.
                Dim namedPermissions As IList
                namedPermissions = currentLevel.NamedPermissionSets

                Dim namedPermission As IEnumerator
                namedPermission = namedPermissions.GetEnumerator()

                Dim currentPermission As NamedPermissionSet
                ' Locate the named permission set.
                While namedPermission.MoveNext()
                    currentPermission = CType( _
                        namedPermission.Current, _
                        NamedPermissionSet)

                    If currentPermission.Name.Equals(name) Then
                        Return currentPermission.ToString()
                    End If
                End While
            End If
        End While
        Return Nothing
    End Function

    ' Write specified message and carriage return to the output textbox.
    Private Sub WriteLine(ByVal message As String)
        tbxOutput.AppendText(message + vbCrLf)

    End Sub

    ' Event handler for Exit button.
    Private Sub Button2_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button2.Click

        Application.Exit()
    End Sub
#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents Panel2 As System.Windows.Forms.Panel
    Friend WithEvents Panel1 As System.Windows.Forms.Panel
    Friend WithEvents Button1 As System.Windows.Forms.Button
    Friend WithEvents Button2 As System.Windows.Forms.Button
    Friend WithEvents tbxOutput As System.Windows.Forms.RichTextBox
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.Panel2 = New System.Windows.Forms.Panel
        Me.Button1 = New System.Windows.Forms.Button
        Me.Button2 = New System.Windows.Forms.Button
        Me.Panel1 = New System.Windows.Forms.Panel
        Me.tbxOutput = New System.Windows.Forms.RichTextBox
        Me.Panel2.SuspendLayout()
        Me.Panel1.SuspendLayout()
        Me.SuspendLayout()
        '
        'Panel2
        '
        Me.Panel2.Controls.Add(Me.Button1)
        Me.Panel2.Controls.Add(Me.Button2)
        Me.Panel2.Dock = System.Windows.Forms.DockStyle.Bottom
        Me.Panel2.DockPadding.All = 20
        Me.Panel2.Location = New System.Drawing.Point(0, 320)
        Me.Panel2.Name = "Panel2"
        Me.Panel2.Size = New System.Drawing.Size(616, 64)
        Me.Panel2.TabIndex = 1
        '
        'Button1
        '
        Me.Button1.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button1.Font = New System.Drawing.Font( _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button1.Location = New System.Drawing.Point(446, 20)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(75, 24)
        Me.Button1.TabIndex = 2
        Me.Button1.Text = "&Run"
        '
        'Button2
        '
        Me.Button2.Dock = System.Windows.Forms.DockStyle.Right
        Me.Button2.Font = New System.Drawing.Font( _
            "Microsoft Sans Serif", _
            9.0!, _
            System.Drawing.FontStyle.Regular, _
            System.Drawing.GraphicsUnit.Point, _
            CType(0, Byte))
        Me.Button2.Location = New System.Drawing.Point(521, 20)
        Me.Button2.Name = "Button2"
        Me.Button2.Size = New System.Drawing.Size(75, 24)
        Me.Button2.TabIndex = 3
        Me.Button2.Text = "E&xit"
        '
        'Panel1
        '
        Me.Panel1.Controls.Add(Me.tbxOutput)
        Me.Panel1.Dock = System.Windows.Forms.DockStyle.Fill
        Me.Panel1.DockPadding.All = 20
        Me.Panel1.Location = New System.Drawing.Point(0, 0)
        Me.Panel1.Name = "Panel1"
        Me.Panel1.Size = New System.Drawing.Size(616, 320)
        Me.Panel1.TabIndex = 2
        '
        'tbxOutput
        '
        Me.tbxOutput.AccessibleDescription = _
            "Displays output from application."
        Me.tbxOutput.AccessibleName = "Output textbox."
        Me.tbxOutput.Dock = System.Windows.Forms.DockStyle.Fill
        Me.tbxOutput.Location = New System.Drawing.Point(20, 20)
        Me.tbxOutput.Name = "tbxOutput"
        Me.tbxOutput.Size = New System.Drawing.Size(576, 280)
        Me.tbxOutput.TabIndex = 1
        Me.tbxOutput.Text = "Click the Run button to run the application."
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
        Me.ClientSize = New System.Drawing.Size(616, 384)
        Me.Controls.Add(Me.Panel1)
        Me.Controls.Add(Me.Panel2)
        Me.Name = "Form1"
        Me.Text = "PermisstionSetAttribute"
        Me.Panel2.ResumeLayout(False)
        Me.Panel1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region
End Class
'
' This sample produces the following output:
'
' File created at c:\temp\LocalIntranet.xml
' Uncomment the BuildFile=false line and run the sample again.
'
' This sample completed successfully; press Exit to continue.
'
'
' The second time the sample is ran (without DEBUG flag):
'
' Attempting to read a file using the FullTrust permission set.
' The file was successfully read.
' Attempting to read a file using the LocalIntranet permission set.
' Request for the permission of type
' System.Security.Permissions.FileIOPermission, mscorlib, Version=1.0.5000.0,
' Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.
'
' Second attempt to read a file using the LocalIntranet permission set.
' Request for the permission of type System.Security.Permissions.FileIOPermission,
' mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
' failed.
' This sample completed successfully; press Exit to continue.

Comentários

Cuidado

O CAS (Segurança de Acesso do Código) foi preterido em todas as versões do .NET Framework e do .NET. As versões recentes do .NET não aceitam anotações de CAS e produzem erros caso as APIs relacionadas ao CAS sejam usadas. Os desenvolvedores devem buscar meios alternativos de realizar tarefas de segurança.

As PermissionSetAttribute propriedades Name, Filee XML são mutuamente exclusivas, o que significa que um conjunto de permissões pode ter como origem apenas um dos seguintes: um conjunto de permissões nomeado, um arquivo que contém uma representação XML de um conjunto de permissões ou uma cadeia de caracteres que contém uma representação XML de um conjunto de permissões.

O escopo da declaração permitida depende do SecurityAction usado. Um SecurityAction executado em um PermissionSet é o equivalente a executar essa ação em cada uma das permissões dentro do conjunto.

As informações de segurança declaradas por um atributo de segurança são armazenadas nos metadados do destino do atributo e são acessadas pelo sistema em tempo de execução. Os atributos de segurança são usados apenas para segurança declarativa. Para segurança imperativa, use a classe de permissão correspondente.

Construtores

PermissionSetAttribute(SecurityAction)

Obsoleto. Inicializa uma nova instância da classe PermissionSetAttribute com a ação de segurança especificada.

Propriedades

Action	Obsoleto. Obtém ou define uma ação de segurança. (Herdado de SecurityAttribute)
File	Obsoleto. Obtém ou define um arquivo que contém a representação XML de um conjunto de permissões personalizado a ser declarado.
Hex	Obsoleto. Obtém ou define a representação hexadecimal do conjunto de permissões codificado por XML.
Name	Obsoleto. Obtém ou define o nome do conjunto de permissões.
TypeId	Obsoleto. Quando implementado em uma classe derivada, obtém um identificador exclusivo para este Attribute. (Herdado de Attribute)
UnicodeEncoded	Obsoleto. Obtém ou define um valor que indica se o arquivo especificado por File é Unicode ou codificado por ASCII.
Unrestricted	Obsoleto. Obtém ou define um valor que indica se a permissão total (irrestrita) para o recurso protegido pelo atributo é declarada. (Herdado de SecurityAttribute)
XML	Obsoleto. Obtém ou define a representação XML de um conjunto de permissões.

Métodos

CreatePermission()	Obsoleto. Este método não é usado.
CreatePermissionSet()	Obsoleto. Cria e retorna um novo conjunto de permissões com base neste objeto de atributo do conjunto de permissões.
Equals(Object)	Obsoleto. Retorna um valor que indica se essa instância é igual a um objeto especificado. (Herdado de Attribute)
GetHashCode()	Obsoleto. Retorna o código hash para a instância. (Herdado de Attribute)
GetType()	Obsoleto. Obtém o Type da instância atual. (Herdado de Object)
IsDefaultAttribute()	Obsoleto. Quando substituído em uma classe derivada, indica se o valor dessa instância é o valor padrão para a classe derivada. (Herdado de Attribute)
Match(Object)	Obsoleto. Quando substituído em uma classe derivada, retorna um valor que indica se essa instância é igual a um objeto especificado. (Herdado de Attribute)
MemberwiseClone()	Obsoleto. Cria uma cópia superficial do Object atual. (Herdado de Object)
ToString()	Obsoleto. Retorna uma cadeia de caracteres que representa o objeto atual. (Herdado de Object)

Confira também

• PermissionSet
• NamedPermissionSet
• Estendendo metadados por meio de atributos