PermissionSet 클래스
다양한 형식의 사용 권한을 포함할 수 있는 컬렉션을 나타냅니다.
네임스페이스: System.Security
어셈블리: mscorlib(mscorlib.dll)
구문
‘선언
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Class PermissionSet
Implements ISecurityEncodable, ICollection, IEnumerable, IStackWalk, _
IDeserializationCallback
‘사용 방법
Dim instance As PermissionSet
[SerializableAttribute]
[ComVisibleAttribute(true)]
public class PermissionSet : ISecurityEncodable, ICollection, IEnumerable,
IStackWalk, IDeserializationCallback
[SerializableAttribute]
[ComVisibleAttribute(true)]
public ref class PermissionSet : ISecurityEncodable, ICollection, IEnumerable,
IStackWalk, IDeserializationCallback
/** @attribute SerializableAttribute() */
/** @attribute ComVisibleAttribute(true) */
public class PermissionSet implements ISecurityEncodable, ICollection,
IEnumerable, IStackWalk, IDeserializationCallback
SerializableAttribute
ComVisibleAttribute(true)
public class PermissionSet implements ISecurityEncodable, ICollection,
IEnumerable, IStackWalk, IDeserializationCallback
설명
PermissionSet를 사용하여 여러 사용 권한 작업을 그룹화하여 수행할 수 있습니다.
예제
다음 코드 예제에서는 PermissionSet 클래스 및 멤버를 사용하는 방법을 보여 줍니다.
' This sample demonstrates the use of the PermissionSet class.
Imports System
Imports System.Reflection
Imports System.Security.Permissions
Imports System.Security
Imports System.IO
Imports System.Collections
Imports Microsoft.VisualBasic
Class [MyClass]
Public Shared Sub PermissionSetDemo()
Console.WriteLine("Executing PermissionSetDemo")
Try
' Open a new PermissionSet.
Dim ps1 As New PermissionSet(PermissionState.None)
Console.WriteLine("Adding permission to open a file from a file dialog box.")
' Add a permission to the permission set.
ps1.AddPermission(New FileDialogPermission(FileDialogPermissionAccess.Open))
Console.WriteLine("Demanding permission to open a file.")
ps1.Demand()
Console.WriteLine("Demand succeeded.")
Console.WriteLine("Adding permission to save a file from a file dialog box.")
ps1.AddPermission(New FileDialogPermission(FileDialogPermissionAccess.Save))
Console.WriteLine("Demanding permission to open and save a file.")
ps1.Demand()
Console.WriteLine("Demand succeeded.")
Console.WriteLine("Adding permission to read environment variable USERNAME.")
ps1.AddPermission(New EnvironmentPermission(EnvironmentPermissionAccess.Read, "USERNAME"))
ps1.Demand()
Console.WriteLine("Demand succeeded.")
Console.WriteLine("Adding permission to read environment variable COMPUTERNAME.")
ps1.AddPermission(New EnvironmentPermission(EnvironmentPermissionAccess.Write, "COMPUTERNAME"))
' Demand all the permissions in the set.
Console.WriteLine("Demand all permissions.")
ps1.Demand()
Console.WriteLine("Demand succeeded.")
' Display the number of permissions in the set.
Console.WriteLine("Number of permissions = " & ps1.Count)
' Display the value of the IsSynchronized property.
Console.WriteLine("IsSynchronized property = " & ps1.IsSynchronized)
' Display the value of the IsReadOnly property.
Console.WriteLine("IsReadOnly property = " & ps1.IsReadOnly)
' Display the value of the SyncRoot property.
Console.WriteLine("SyncRoot property = " & CType(ps1.SyncRoot, PermissionSet).ToString())
' Display the result of a call to the ContainsNonCodeAccessPermissions method.
' Gets a value indicating whether the PermissionSet contains permissions
' that are not derived from CodeAccessPermission.
' Returns true if the PermissionSet contains permissions that are not
' derived from CodeAccessPermission; otherwise, false.
Console.WriteLine("ContainsNonCodeAccessPermissions method returned " & ps1.ContainsNonCodeAccessPermissions())
Console.WriteLine("Value of the permission set ToString = " & ControlChars.Lf & ps1.ToString())
Dim ps2 As New PermissionSet(PermissionState.None)
' Create a second permission set and compare it to the first permission set.
ps2.AddPermission(New EnvironmentPermission(EnvironmentPermissionAccess.Read, "USERNAME"))
ps2.AddPermission(New EnvironmentPermission(EnvironmentPermissionAccess.Write, "COMPUTERNAME"))
Console.WriteLine("Permissions in first permission set:")
Dim list As IEnumerator = ps1.GetEnumerator()
While list.MoveNext()
Console.WriteLine(list.Current.ToString())
End While
Console.WriteLine("Second permission IsSubsetOf first permission = " & ps2.IsSubsetOf(ps1))
' Display the intersection of two permission sets.
Dim ps3 As PermissionSet = ps2.Intersect(ps1)
Console.WriteLine("The intersection of the first permission set and " & "the second permission set = " & ps3.ToString())
' Create a new permission set.
Dim ps4 As New PermissionSet(PermissionState.None)
ps4.AddPermission(New FileIOPermission(FileIOPermissionAccess.Read, "C:\Temp\Testfile.txt"))
ps4.AddPermission(New FileIOPermission(FileIOPermissionAccess.Read Or FileIOPermissionAccess.Write Or FileIOPermissionAccess.Append, "C:\Temp\Testfile.txt"))
' Display the union of two permission sets.
Dim ps5 As PermissionSet = ps3.Union(ps4)
Console.WriteLine("The union of permission set 3 and permission set 4 = " & ps5.ToString())
' Remove FileIOPermission from the permission set.
ps5.RemovePermission(GetType(FileIOPermission))
Console.WriteLine("The last permission set after removing FileIOPermission = " & ps5.ToString())
' Change the permission set using SetPermission.
ps5.SetPermission(New EnvironmentPermission(EnvironmentPermissionAccess.AllAccess, "USERNAME"))
Console.WriteLine("Permission set after SetPermission = " & ps5.ToString())
' Display result of ToXml and FromXml operations.
Dim ps6 As New PermissionSet(PermissionState.None)
ps6.FromXml(ps5.ToXml())
Console.WriteLine("Result of ToFromXml = " & ps6.ToString() & ControlChars.Lf)
' Display results of PermissionSet.GetEnumerator.
Dim psEnumerator As IEnumerator = ps1.GetEnumerator()
While psEnumerator.MoveNext()
Console.WriteLine(psEnumerator.Current)
End While
' Check for an unrestricted permission set.
Dim ps7 As New PermissionSet(PermissionState.Unrestricted)
Console.WriteLine("Permission set is unrestricted = " & ps7.IsUnrestricted())
' Create and display a copy of a permission set.
ps7 = ps5.Copy()
Console.WriteLine("Result of copy = " & ps7.ToString())
Catch e As Exception
Console.WriteLine(e.Message.ToString())
End Try
End Sub 'PermissionSetDemo
Overloads Shared Sub Main(ByVal args() As String)
PermissionSetDemo()
End Sub 'Main
End Class '[MyClass]
// This sample demonstrates the use of the PermissionSet class.
using System;
using System.Reflection;
using System.Security.Permissions;
using System.Security;
using System.IO;
using System.Collections;
class MyClass
{
public static void PermissionSetDemo()
{
Console.WriteLine("Executing PermissionSetDemo");
try
{
// Open a new PermissionSet.
PermissionSet ps1 = new PermissionSet(PermissionState.None);
Console.WriteLine("Adding permission to open a file from a file dialog box.");
// Add a permission to the permission set.
ps1.AddPermission(
new FileDialogPermission(FileDialogPermissionAccess.Open));
Console.WriteLine("Demanding permission to open a file.");
ps1.Demand();
Console.WriteLine("Demand succeeded.");
Console.WriteLine("Adding permission to save a file from a file dialog box.");
ps1.AddPermission(
new FileDialogPermission(FileDialogPermissionAccess.Save));
Console.WriteLine("Demanding permission to open and save a file.");
ps1.Demand();
Console.WriteLine("Demand succeeded.");
Console.WriteLine("Adding permission to read environment variable USERNAME.");
ps1.AddPermission(
new EnvironmentPermission(EnvironmentPermissionAccess.Read, "USERNAME"));
ps1.Demand();
Console.WriteLine("Demand succeeded.");
Console.WriteLine("Adding permission to read environment variable COMPUTERNAME.");
ps1.AddPermission(
new EnvironmentPermission(EnvironmentPermissionAccess.Write,
"COMPUTERNAME"));
// Demand all the permissions in the set.
Console.WriteLine("Demand all permissions.");
ps1.Demand();
Console.WriteLine("Demand succeeded.");
// Display the number of permissions in the set.
Console.WriteLine("Number of permissions = " + ps1.Count);
// Display the value of the IsSynchronized property.
Console.WriteLine("IsSynchronized property = " + ps1.IsSynchronized);
// Display the value of the IsReadOnly property.
Console.WriteLine("IsReadOnly property = " + ps1.IsReadOnly);
// Display the value of the SyncRoot property.
Console.WriteLine("SyncRoot property = " + ps1.SyncRoot);
// Display the result of a call to the ContainsNonCodeAccessPermissions method.
// Gets a value indicating whether the PermissionSet contains permissions
// that are not derived from CodeAccessPermission.
// Returns true if the PermissionSet contains permissions that are not
// derived from CodeAccessPermission; otherwise, false.
Console.WriteLine("ContainsNonCodeAccessPermissions method returned " +
ps1.ContainsNonCodeAccessPermissions());
Console.WriteLine("Value of the permission set ToString = \n" + ps1.ToString());
PermissionSet ps2 = new PermissionSet(PermissionState.None);
// Create a second permission set and compare it to the first permission set.
ps2.AddPermission(
new EnvironmentPermission(EnvironmentPermissionAccess.Read, "USERNAME"));
ps2.AddPermission(
new EnvironmentPermission(EnvironmentPermissionAccess.Write, "COMPUTERNAME"));
IEnumerator list = ps1.GetEnumerator();
Console.WriteLine("Permissions in first permission set:");
while (list.MoveNext())
Console.WriteLine(list.Current.ToString());
Console.WriteLine("Second permission IsSubsetOf first permission = " + ps2.IsSubsetOf(ps1));
// Display the intersection of two permission sets.
PermissionSet ps3 = ps2.Intersect(ps1);
Console.WriteLine("The intersection of the first permission set and "
+ "the second permission set = " + ps3.ToString());
// Create a new permission set.
PermissionSet ps4 = new PermissionSet(PermissionState.None);
ps4.AddPermission(
new FileIOPermission(FileIOPermissionAccess.Read,
"C:\\Temp\\Testfile.txt"));
ps4.AddPermission(
new FileIOPermission(FileIOPermissionAccess.Read |
FileIOPermissionAccess.Write | FileIOPermissionAccess.Append,
"C:\\Temp\\Testfile.txt"));
// Display the union of two permission sets.
PermissionSet ps5 = ps3.Union(ps4);
Console.WriteLine("The union of permission set 3 and permission set 4 = "
+ ps5.ToString());
// Remove FileIOPermission from the permission set.
ps5.RemovePermission(typeof(FileIOPermission));
Console.WriteLine("The last permission set after removing FileIOPermission = "
+ ps5.ToString());
// Change the permission set using SetPermission.
ps5.SetPermission(new EnvironmentPermission(EnvironmentPermissionAccess.AllAccess, "USERNAME"));
Console.WriteLine("Permission set after SetPermission = " + ps5.ToString());
// Display result of ToXml and FromXml operations.
PermissionSet ps6 = new PermissionSet(PermissionState.None);
ps6.FromXml(ps5.ToXml());
Console.WriteLine("Result of ToFromXml = " + ps6.ToString() + "\n");
// Display results of PermissionSet.GetEnumerator.
IEnumerator psEnumerator = ps1.GetEnumerator();
while (psEnumerator.MoveNext())
{
Console.WriteLine(psEnumerator.Current);
}
// Check for an unrestricted permission set.
PermissionSet ps7 = new PermissionSet(PermissionState.Unrestricted);
Console.WriteLine("Permission set is unrestricted = " + ps7.IsUnrestricted());
// Create and display a copy of a permission set.
ps7 = ps5.Copy();
Console.WriteLine("Result of copy = " + ps7.ToString());
}
catch (Exception e)
{
Console.WriteLine(e.Message.ToString());
}
}
static void Main(string[] args)
{
PermissionSetDemo();
}
}
// This sample demonstrates the use of the PermissionSet class.
using namespace System;
using namespace System::Reflection;
using namespace System::Security::Permissions;
using namespace System::Security;
using namespace System::IO;
using namespace System::Collections;
void PermissionSetDemo()
{
Console::WriteLine( "Executing PermissionSetDemo" );
try
{
// Open a new PermissionSet.
PermissionSet^ ps1 = gcnew PermissionSet( PermissionState::None );
Console::WriteLine( "Adding permission to open a file from a file dialog box." );
// Add a permission to the permission set.
ps1->AddPermission( gcnew FileDialogPermission( FileDialogPermissionAccess::Open ) );
Console::WriteLine( "Demanding permission to open a file." );
ps1->Demand();
Console::WriteLine( "Demand succeeded." );
Console::WriteLine( "Adding permission to save a file from a file dialog box." );
ps1->AddPermission( gcnew FileDialogPermission( FileDialogPermissionAccess::Save ) );
Console::WriteLine( "Demanding permission to open and save a file." );
ps1->Demand();
Console::WriteLine( "Demand succeeded." );
Console::WriteLine( "Adding permission to read environment variable USERNAME." );
ps1->AddPermission( gcnew EnvironmentPermission( EnvironmentPermissionAccess::Read,"USERNAME" ) );
ps1->Demand();
Console::WriteLine( "Demand succeeded." );
Console::WriteLine( "Adding permission to read environment variable COMPUTERNAME." );
ps1->AddPermission( gcnew EnvironmentPermission( EnvironmentPermissionAccess::Write,"COMPUTERNAME" ) );
// Demand all the permissions in the set.
Console::WriteLine( "Demand all permissions." );
ps1->Demand();
Console::WriteLine( "Demand succeeded." );
// Display the number of permissions in the set.
Console::WriteLine( "Number of permissions = {0}", ps1->Count );
// Display the value of the IsSynchronized property.
Console::WriteLine( "IsSynchronized property = {0}", ps1->IsSynchronized );
// Display the value of the IsReadOnly property.
Console::WriteLine( "IsReadOnly property = {0}", ps1->IsReadOnly );
// Display the value of the SyncRoot property.
Console::WriteLine( "SyncRoot property = {0}", ps1->SyncRoot );
// Display the result of a call to the ContainsNonCodeAccessPermissions method.
// Gets a value indicating whether the PermissionSet contains permissions
// that are not derived from CodeAccessPermission.
// Returns true if the PermissionSet contains permissions that are not
// derived from CodeAccessPermission; otherwise, false.
Console::WriteLine( "ContainsNonCodeAccessPermissions method returned {0}", ps1->ContainsNonCodeAccessPermissions() );
Console::WriteLine( "Value of the permission set ToString = \n{0}", ps1->ToString() );
PermissionSet^ ps2 = gcnew PermissionSet( PermissionState::None );
// Create a second permission set and compare it to the first permission set.
ps2->AddPermission( gcnew EnvironmentPermission( EnvironmentPermissionAccess::Read,"USERNAME" ) );
ps2->AddPermission( gcnew EnvironmentPermission( EnvironmentPermissionAccess::Write,"COMPUTERNAME" ) );
IEnumerator^ list = ps1->GetEnumerator();
Console::WriteLine("Permissions in first permission set:");
while (list->MoveNext())
Console::WriteLine(list->Current->ToString());
Console::WriteLine( "Second permission IsSubsetOf first permission = {0}", ps2->IsSubsetOf( ps1 ) );
// Display the intersection of two permission sets.
PermissionSet^ ps3 = ps2->Intersect( ps1 );
Console::WriteLine( "The intersection of the first permission set and the second permission set = {0}", ps3 );
// Create a new permission set.
PermissionSet^ ps4 = gcnew PermissionSet( PermissionState::None );
ps4->AddPermission( gcnew FileIOPermission( FileIOPermissionAccess::Read,"C:\\Temp\\Testfile.txt" ) );
ps4->AddPermission( gcnew FileIOPermission( static_cast<FileIOPermissionAccess>(FileIOPermissionAccess::Read | FileIOPermissionAccess::Write | FileIOPermissionAccess::Append),"C:\\Temp\\Testfile.txt" ) );
// Display the union of two permission sets.
PermissionSet^ ps5 = ps3->Union( ps4 );
Console::WriteLine( "The union of permission set 3 and permission set 4 = {0}", ps5 );
// Remove FileIOPermission from the permission set.
ps5->RemovePermission( FileIOPermission::typeid );
Console::WriteLine( "The last permission set after removing FileIOPermission = {0}", ps5 );
// Change the permission set using SetPermission.
ps5->SetPermission( gcnew EnvironmentPermission( EnvironmentPermissionAccess::AllAccess,"USERNAME" ) );
Console::WriteLine( "Permission set after SetPermission = {0}", ps5 );
// Display result of ToXml and FromXml operations.
PermissionSet^ ps6 = gcnew PermissionSet( PermissionState::None );
ps6->FromXml( ps5->ToXml() );
Console::WriteLine( "Result of ToFromXml = {0}\n", ps6 );
// Display results of PermissionSet::GetEnumerator.
IEnumerator^ psEnumerator = ps1->GetEnumerator();
while ( psEnumerator->MoveNext() )
{
Console::WriteLine( psEnumerator->Current );
}
// Check for an unrestricted permission set.
PermissionSet^ ps7 = gcnew PermissionSet( PermissionState::Unrestricted );
Console::WriteLine( "Permission set is unrestricted = {0}", ps7->IsUnrestricted() );
// Create and display a copy of a permission set.
ps7 = ps5->Copy();
Console::WriteLine( "Result of copy = {0}", ps7 );
}
catch ( Exception^ e )
{
Console::WriteLine( e->Message );
}
}
int main()
{
PermissionSetDemo();
}
// This sample demonstrates the use of the PermissionSet class.
import System.*;
import System.Reflection.*;
import System.Security.Permissions.*;
import System.Security.*;
import System.IO.*;
import System.Collections.*;
class MyClass
{
public static void PermissionSetDemo()
{
Console.WriteLine("Executing PermissionSetDemo");
try
{
// Open a new PermissionSet.
PermissionSet ps1 = new PermissionSet(PermissionState.None);
Console.WriteLine("Adding permission to open a file"
+ " from a file dialog box.");
// Add a permission to the permission set.
ps1.AddPermission(new FileDialogPermission(
FileDialogPermissionAccess.Open));
Console.WriteLine("Demanding permission to open a file.");
ps1.Demand();
Console.WriteLine("Demand succeeded.");
Console.WriteLine("Adding permission to save"
+ " a file from a file dialog box.");
ps1.AddPermission(new FileDialogPermission(
FileDialogPermissionAccess.Save));
Console.WriteLine("Demanding permission to open and save a file.");
ps1.Demand();
Console.WriteLine("Demand succeeded.");
Console.WriteLine("Adding permission to read "
+ "environment variable USERNAME.");
ps1.AddPermission(new EnvironmentPermission(
EnvironmentPermissionAccess.Read, "USERNAME"));
ps1.Demand();
Console.WriteLine("Demand succeeded.");
Console.WriteLine("Adding permission to read "
+ "environment variable COMPUTERNAME.");
ps1.AddPermission(new EnvironmentPermission(
EnvironmentPermissionAccess.Write, "COMPUTERNAME"));
// Demand all the permissions in the set.
Console.WriteLine("Demand all permissions.");
ps1.Demand();
Console.WriteLine("Demand succeeded.");
// Display the number of permissions in the set.
Console.WriteLine(("Number of permissions = " + ps1.get_Count()));
// Display the value of the IsSynchronized property.
Console.WriteLine(("IsSynchronized property = "
+ System.Convert.ToString(ps1.get_IsSynchronized())));
// Display the value of the IsReadOnly property.
Console.WriteLine(("IsReadOnly property = "
+ System.Convert.ToString(ps1.get_IsReadOnly())));
// Display the value of the SyncRoot property.
Console.WriteLine(("SyncRoot property = " + ps1.get_SyncRoot()));
// Display the result of a call to the
// ContainsNonCodeAccessPermissions method.
// Gets a value indicating whether the PermissionSet
// contains permissions
// that are not derived from CodeAccessPermission.
// Returns true if the PermissionSet contains permissions that are
// not derived from CodeAccessPermission; otherwise, false.
Console.WriteLine(
("ContainsNonCodeAccessPermissions method returned "
+ System.Convert.ToString(
ps1.ContainsNonCodeAccessPermissions())));
Console.WriteLine(("Value of the permission set ToString = \n"
+ ps1.ToString()));
PermissionSet ps2 = new PermissionSet(PermissionState.None);
// Create a second permission set and compare it to the
// first permission set.
ps2.AddPermission(new EnvironmentPermission(
EnvironmentPermissionAccess.Read, "USERNAME"));
ps2.AddPermission(new EnvironmentPermission(
EnvironmentPermissionAccess.Write, "COMPUTERNAME"));
IEnumerator list = ps1.GetEnumerator();
Console.WriteLine("Permissions in first permission set:");
while (list.MoveNext())
Console.WriteLine(list.get_Current().ToString());
Console.WriteLine(
("Second permission IsSubsetOf first permission = "
+ System.Convert.ToString(ps2.IsSubsetOf(ps1))));
// Display the intersection of two permission sets.
PermissionSet ps3 = ps2.Intersect(ps1);
Console.WriteLine(
("The intersection of the first permission set and "
+ "the second permission set = " + ps3.ToString()));
// Create a new permission set.
PermissionSet ps4 = new PermissionSet(PermissionState.None);
ps4.AddPermission(new FileIOPermission(
FileIOPermissionAccess.Read, "C:\\Temp\\Testfile.txt"));
ps4.AddPermission(new FileIOPermission(
FileIOPermissionAccess.Read | FileIOPermissionAccess.Write
| FileIOPermissionAccess.Append, "C:\\Temp\\Testfile.txt"));
// Display the union of two permission sets.
PermissionSet ps5 = ps3.Union(ps4);
Console.WriteLine(
("The union of permission set 3 and permission set 4 = "
+ ps5.ToString()));
// Remove FileIOPermission from the permission set.
ps5.RemovePermission(FileIOPermission.class.ToType());
Console.WriteLine(
("The last permission set after removing FileIOPermission = "
+ ps5.ToString()));
// Change the permission set using SetPermission.
ps5.SetPermission(new EnvironmentPermission(
EnvironmentPermissionAccess.AllAccess, "USERNAME"));
Console.WriteLine(
("Permission set after SetPermission = "
+ ps5.ToString()));
// Display result of ToXml and FromXml operations.
PermissionSet ps6 = new PermissionSet(PermissionState.None);
ps6.FromXml(ps5.ToXml());
Console.WriteLine(("Result of ToFromXml = "
+ ps6.ToString() + "\n"));
// Display results of PermissionSet.GetEnumerator.
IEnumerator psEnumerator = ps1.GetEnumerator();
while (psEnumerator.MoveNext())
{
Console.WriteLine(psEnumerator.get_Current());
}
// Check for an unrestricted permission set.
PermissionSet ps7 = new PermissionSet(PermissionState.Unrestricted);
Console.WriteLine(
("Permission set is unrestricted = "
+ System.Convert.ToString(ps7.IsUnrestricted())));
// Create and display a copy of a permission set.
ps7 = ps5.Copy();
Console.WriteLine(("Result of copy = " + ps7.ToString()));
}
catch (System.Exception e)
{
Console.WriteLine(e.get_Message().ToString());
}
} //PermissionSetDemo
public static void main(String[] args)
{
PermissionSetDemo();
} //main
} //MyClass
.NET Framework 보안
- StrongNameIdentityPermission PermissionSet에서 상속하는 데 필요한 권한입니다. Microsoft StrongName으로 서명된 어셈블리만 PermissionSet에서 상속될 수 있습니다.
상속 계층 구조
System.Object
System.Security.PermissionSet
System.Security.NamedPermissionSet
스레드로부터의 안전성
이 형식의 모든 public static(Visual Basic의 경우 Shared) 멤버는 스레드로부터 안전합니다. 인터페이스 멤버는 스레드로부터 안전하지 않습니다.
플랫폼
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework에서 모든 플래폼의 모든 버전을 지원하지는 않습니다. 지원되는 버전의 목록은 시스템 요구 사항을 참조하십시오.
버전 정보
.NET Framework
2.0, 1.1, 1.0에서 지원