Code:
/ FXUpdate3074 / FXUpdate3074 / 1.1 / DEVDIV / depot / DevDiv / releases / whidbey / QFE / ndp / fx / src / xsp / System / Web / ImpersonationContext.cs / 4 / 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 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. //------------------------------------------------------------------------------ //// 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 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- XamlGridLengthSerializer.cs
- MetadataReference.cs
- Paragraph.cs
- AssemblySettingAttributes.cs
- ManagedWndProcTracker.cs
- DetailsViewRowCollection.cs
- PrivilegeNotHeldException.cs
- glyphs.cs
- CFStream.cs
- FixedSOMTableRow.cs
- RuntimeComponentFilter.cs
- loginstatus.cs
- SourceElementsCollection.cs
- DelimitedListTraceListener.cs
- AnnotationResourceChangedEventArgs.cs
- MailSettingsSection.cs
- TextBox.cs
- FilteredReadOnlyMetadataCollection.cs
- SchemaUtility.cs
- ObsoleteAttribute.cs
- DataReceivedEventArgs.cs
- ListChunk.cs
- PasswordDeriveBytes.cs
- SystemMulticastIPAddressInformation.cs
- XPathParser.cs
- _LazyAsyncResult.cs
- TypeForwardedToAttribute.cs
- OleDbErrorCollection.cs
- Viewport3DAutomationPeer.cs
- TcpSocketManager.cs
- BooleanFacetDescriptionElement.cs
- HttpProfileBase.cs
- MultipartContentParser.cs
- SocketInformation.cs
- WebPageTraceListener.cs
- XmlAnyElementAttribute.cs
- Mappings.cs
- CommentEmitter.cs
- BackEase.cs
- MLangCodePageEncoding.cs
- CursorConverter.cs
- SqlCaseSimplifier.cs
- CompressionTransform.cs
- SubMenuStyle.cs
- VirtualDirectoryMapping.cs
- TypedDatasetGenerator.cs
- cache.cs
- ThreadStaticAttribute.cs
- DbDataReader.cs
- DbRetry.cs
- ImpersonationContext.cs
- XamlDesignerSerializationManager.cs
- CopyOnWriteList.cs
- FontFamilyConverter.cs
- XamlPointCollectionSerializer.cs
- UriParserTemplates.cs
- StreamMarshaler.cs
- PartitionedStream.cs
- MLangCodePageEncoding.cs
- OdbcStatementHandle.cs
- NodeFunctions.cs
- StylusDevice.cs
- GridViewCellAutomationPeer.cs
- ComplexType.cs
- CompiledQuery.cs
- ProtectedProviderSettings.cs
- MeshGeometry3D.cs
- SystemWebSectionGroup.cs
- SwitchAttribute.cs
- HtmlTernaryTree.cs
- diagnosticsswitches.cs
- VersionedStreamOwner.cs
- RoleManagerModule.cs
- WebServiceMethodData.cs
- GeneratedView.cs
- IIS7UserPrincipal.cs
- ProgressBar.cs
- ColorTranslator.cs
- GatewayDefinition.cs
- ScaleTransform.cs
- TableCellAutomationPeer.cs
- PersistenceIOParticipant.cs
- ToolStripDropDownItem.cs
- XPathSelectionIterator.cs
- ComboBoxAutomationPeer.cs
- LocalFileSettingsProvider.cs
- MetadataPropertyvalue.cs
- MenuRenderer.cs
- HMACSHA384.cs
- MimeTypeAttribute.cs
- DirectoryNotFoundException.cs
- Registry.cs
- Resources.Designer.cs
- FunctionNode.cs
- CriticalHandle.cs
- CompilerScope.cs
- DataRowComparer.cs
- CalculatedColumn.cs
- StatusBarItemAutomationPeer.cs
- SHA1.cs