Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / fx / src / xsp / System / Web / ImpersonationContext.cs / 1 / ImpersonationContext.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web { using System; using System.Runtime.InteropServices; using System.Security.Permissions; using System.Web.Configuration; using System.Web.Hosting; using System.Web.Util; internal class ImpersonationContext : IDisposable { private HandleRef _savedToken; private bool _reverted; private bool _impersonating; // arg-less ctor creates dummy context internal ImpersonationContext() { } // ctor that takes a token impersonates that token internal ImpersonationContext(IntPtr token) { ImpersonateToken(new HandleRef(this, token)); } // IDisposable pattern ~ImpersonationContext() { Dispose(false); } void IDisposable.Dispose() { Undo(); } private void Dispose(bool disposing) { if (_savedToken.Handle != IntPtr.Zero) { try {} finally { UnsafeNativeMethods.CloseHandle(_savedToken.Handle); _savedToken = new HandleRef(this, IntPtr.Zero); } } } // impersonate a given token protected void ImpersonateToken(HandleRef token) { try { // first revert _savedToken = new HandleRef(this, GetCurrentToken()); if (_savedToken.Handle != IntPtr.Zero) { if (UnsafeNativeMethods.RevertToSelf() != 0) { _reverted = true; } } // impersonate token if not zero if (token.Handle != IntPtr.Zero) { if (UnsafeNativeMethods.SetThreadToken(IntPtr.Zero, token.Handle) == 0) { throw new HttpException(SR.GetString(SR.Cannot_impersonate)); } _impersonating = true; } } catch { RestoreImpersonation(); throw; } } // restore impersonation to the original state private void RestoreImpersonation() { // first revert before reimpersonating if (_impersonating) { UnsafeNativeMethods.RevertToSelf(); _impersonating = false; } // second reimpersonate the orignal saved identity (if exists) if (_savedToken.Handle != IntPtr.Zero) { if (_reverted) { if (UnsafeNativeMethods.SetThreadToken(IntPtr.Zero, _savedToken.Handle) == 0) { throw new HttpException(SR.GetString(SR.Cannot_impersonate)); } } _reverted = false; } } // 'public' version of Dispose internal void Undo() { RestoreImpersonation(); // free unmanaged resources Dispose(true); System.GC.SuppressFinalize(this); } // helper to get the currently impersonated token private static IntPtr GetCurrentToken() { IntPtr token = IntPtr.Zero; if (UnsafeNativeMethods.OpenThreadToken( UnsafeNativeMethods.GetCurrentThread(), UnsafeNativeMethods.TOKEN_READ | UnsafeNativeMethods.TOKEN_IMPERSONATE, true, ref token) == 0) { // if the last error is ERROR_NO_TOKEN it is ok, otherwise throw if (Marshal.GetLastWin32Error() != UnsafeNativeMethods.ERROR_NO_TOKEN) { throw new HttpException(SR.GetString(SR.Cannot_impersonate)); } } return token; } // helper to check if there is a current token internal static bool CurrentThreadTokenExists { get { bool impersonating = false; try {} finally { IntPtr token = GetCurrentToken(); if (token != IntPtr.Zero) { impersonating = true; UnsafeNativeMethods.CloseHandle(token); } } return impersonating; } } } internal sealed class ProcessImpersonationContext : ImpersonationContext { internal ProcessImpersonationContext() { ImpersonateToken(new HandleRef(this, IntPtr.Zero)); } } internal sealed class ApplicationImpersonationContext : ImpersonationContext { internal ApplicationImpersonationContext() { ImpersonateToken(new HandleRef(this, HostingEnvironment.ApplicationIdentityToken)); } } internal sealed class ClientImpersonationContext : ImpersonationContext { internal ClientImpersonationContext(HttpContext context) { Start(context, true); } internal ClientImpersonationContext(HttpContext context, bool throwOnError) { Start(context, throwOnError); } private void Start(HttpContext context, bool throwOnError) { IntPtr token = IntPtr.Zero; try { if (context != null) { token = context.ImpersonationToken; } else { // by default use app identity token = HostingEnvironment.ApplicationIdentityToken; } } catch { if (throwOnError) { throw; } } // only impersonate if there is a token // this is to optimize for the default case of impersonation="false" // and no UNC identity, when requests run under process identity if (token != IntPtr.Zero) { ImpersonateToken(new HandleRef(this, token)); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web { using System; using System.Runtime.InteropServices; using System.Security.Permissions; using System.Web.Configuration; using System.Web.Hosting; using System.Web.Util; internal class ImpersonationContext : IDisposable { private HandleRef _savedToken; private bool _reverted; private bool _impersonating; // arg-less ctor creates dummy context internal ImpersonationContext() { } // ctor that takes a token impersonates that token internal ImpersonationContext(IntPtr token) { ImpersonateToken(new HandleRef(this, token)); } // IDisposable pattern ~ImpersonationContext() { Dispose(false); } void IDisposable.Dispose() { Undo(); } private void Dispose(bool disposing) { if (_savedToken.Handle != IntPtr.Zero) { try {} finally { UnsafeNativeMethods.CloseHandle(_savedToken.Handle); _savedToken = new HandleRef(this, IntPtr.Zero); } } } // impersonate a given token protected void ImpersonateToken(HandleRef token) { try { // first revert _savedToken = new HandleRef(this, GetCurrentToken()); if (_savedToken.Handle != IntPtr.Zero) { if (UnsafeNativeMethods.RevertToSelf() != 0) { _reverted = true; } } // impersonate token if not zero if (token.Handle != IntPtr.Zero) { if (UnsafeNativeMethods.SetThreadToken(IntPtr.Zero, token.Handle) == 0) { throw new HttpException(SR.GetString(SR.Cannot_impersonate)); } _impersonating = true; } } catch { RestoreImpersonation(); throw; } } // restore impersonation to the original state private void RestoreImpersonation() { // first revert before reimpersonating if (_impersonating) { UnsafeNativeMethods.RevertToSelf(); _impersonating = false; } // second reimpersonate the orignal saved identity (if exists) if (_savedToken.Handle != IntPtr.Zero) { if (_reverted) { if (UnsafeNativeMethods.SetThreadToken(IntPtr.Zero, _savedToken.Handle) == 0) { throw new HttpException(SR.GetString(SR.Cannot_impersonate)); } } _reverted = false; } } // 'public' version of Dispose internal void Undo() { RestoreImpersonation(); // free unmanaged resources Dispose(true); System.GC.SuppressFinalize(this); } // helper to get the currently impersonated token private static IntPtr GetCurrentToken() { IntPtr token = IntPtr.Zero; if (UnsafeNativeMethods.OpenThreadToken( UnsafeNativeMethods.GetCurrentThread(), UnsafeNativeMethods.TOKEN_READ | UnsafeNativeMethods.TOKEN_IMPERSONATE, true, ref token) == 0) { // if the last error is ERROR_NO_TOKEN it is ok, otherwise throw if (Marshal.GetLastWin32Error() != UnsafeNativeMethods.ERROR_NO_TOKEN) { throw new HttpException(SR.GetString(SR.Cannot_impersonate)); } } return token; } // helper to check if there is a current token internal static bool CurrentThreadTokenExists { get { bool impersonating = false; try {} finally { IntPtr token = GetCurrentToken(); if (token != IntPtr.Zero) { impersonating = true; UnsafeNativeMethods.CloseHandle(token); } } return impersonating; } } } internal sealed class ProcessImpersonationContext : ImpersonationContext { internal ProcessImpersonationContext() { ImpersonateToken(new HandleRef(this, IntPtr.Zero)); } } internal sealed class ApplicationImpersonationContext : ImpersonationContext { internal ApplicationImpersonationContext() { ImpersonateToken(new HandleRef(this, HostingEnvironment.ApplicationIdentityToken)); } } internal sealed class ClientImpersonationContext : ImpersonationContext { internal ClientImpersonationContext(HttpContext context) { Start(context, true); } internal ClientImpersonationContext(HttpContext context, bool throwOnError) { Start(context, throwOnError); } private void Start(HttpContext context, bool throwOnError) { IntPtr token = IntPtr.Zero; try { if (context != null) { token = context.ImpersonationToken; } else { // by default use app identity token = HostingEnvironment.ApplicationIdentityToken; } } catch { if (throwOnError) { throw; } } // only impersonate if there is a token // this is to optimize for the default case of impersonation="false" // and no UNC identity, when requests run under process identity if (token != IntPtr.Zero) { ImpersonateToken(new HandleRef(this, token)); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- HtmlShim.cs
- nulltextnavigator.cs
- SpellerInterop.cs
- BindableTemplateBuilder.cs
- Typography.cs
- UnknownBitmapDecoder.cs
- ResumeStoryboard.cs
- DataSet.cs
- _SSPISessionCache.cs
- DocumentXmlWriter.cs
- DataGridViewImageColumn.cs
- DictionaryKeyPropertyAttribute.cs
- Point3DCollection.cs
- PrimitiveDataContract.cs
- RuleSetCollection.cs
- OleDbStruct.cs
- XmlQueryContext.cs
- CollectionViewGroupInternal.cs
- Wizard.cs
- ProgressBarBrushConverter.cs
- TimerTable.cs
- DataGridViewCellParsingEventArgs.cs
- WSDualHttpBindingElement.cs
- InvokeBase.cs
- AnimationLayer.cs
- DataChangedEventManager.cs
- HtmlInputSubmit.cs
- NavigationWindow.cs
- CodeExpressionStatement.cs
- ParameterCollectionEditorForm.cs
- PowerStatus.cs
- SafeFindHandle.cs
- AnnouncementService.cs
- ProfessionalColorTable.cs
- OracleParameterCollection.cs
- ParallelQuery.cs
- CrossContextChannel.cs
- PersistenceMetadataNamespace.cs
- RecipientInfo.cs
- SoapSchemaImporter.cs
- WebPartConnectionsConnectVerb.cs
- DesignerAdapterAttribute.cs
- HwndSourceKeyboardInputSite.cs
- DataGridTablesFactory.cs
- EmptyReadOnlyDictionaryInternal.cs
- RuntimeHandles.cs
- VarRefManager.cs
- XmlSchemaSimpleTypeUnion.cs
- XPathDocumentBuilder.cs
- XomlSerializationHelpers.cs
- WebMessageEncodingBindingElement.cs
- DSACryptoServiceProvider.cs
- ProfilePropertySettingsCollection.cs
- TextSegment.cs
- basecomparevalidator.cs
- ObjRef.cs
- StringKeyFrameCollection.cs
- RestHandlerFactory.cs
- WebControlAdapter.cs
- X509SecurityTokenProvider.cs
- followingsibling.cs
- ParseChildrenAsPropertiesAttribute.cs
- TypedElement.cs
- DictionaryGlobals.cs
- AnnotationHelper.cs
- XmlDataLoader.cs
- TreeView.cs
- WorkflowInstanceProxy.cs
- TypeProvider.cs
- AxParameterData.cs
- ZipIOCentralDirectoryBlock.cs
- BridgeDataRecord.cs
- FixedTextSelectionProcessor.cs
- XPathSingletonIterator.cs
- StreamReader.cs
- DataServiceQueryOfT.cs
- CustomUserNameSecurityTokenAuthenticator.cs
- IPCCacheManager.cs
- WebPartZoneBase.cs
- SslStream.cs
- WorkflowApplicationUnhandledExceptionEventArgs.cs
- EventWaitHandle.cs
- RectangleConverter.cs
- thaishape.cs
- LabelDesigner.cs
- PrintControllerWithStatusDialog.cs
- DataSourceSerializationException.cs
- DesignerTextViewAdapter.cs
- CopyCodeAction.cs
- ping.cs
- DbExpressionVisitor_TResultType.cs
- MD5.cs
- ExpandSegmentCollection.cs
- SecurityElement.cs
- ProviderConnectionPointCollection.cs
- Console.cs
- ConfigurationProviderException.cs
- ZipIOZip64EndOfCentralDirectoryBlock.cs
- ResourceReader.cs
- DomNameTable.cs