Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / System.ServiceModel.Activation / System / ServiceModel / Activation / HostedImpersonationContext.cs / 1305376 / HostedImpersonationContext.cs
//------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------- namespace System.ServiceModel.Activation { using System.ComponentModel; using System.Runtime; using System.Runtime.InteropServices; using System.Security; using System.Security.Principal; using System.ServiceModel.Activation.Interop; using System.Threading; [Fx.Tag.SecurityNote(Miscellaneous = "RequiresReview - All member methods are security critical. The class might be used outside of the restricted SecurityContext." + "Ensure they do not accidentally satisfy any demands.")] class HostedImpersonationContext { [Fx.Tag.SecurityNote(Critical = "Stores the impersonation token handle. Since we're allowing 'safe' Impersonation of the token we got from asp.net we need to protect this value.")] [SecurityCritical] SafeCloseHandleCritical tokenHandle; [Fx.Tag.SecurityNote(Critical = "Controls lifetime of token handle, caller must use care.")] [SecurityCritical] int refCount = 0; [Fx.Tag.SecurityNote(Critical = "Security critical field, caller must use care.")] [SecurityCritical] bool isImpersonated; [Fx.Tag.SecurityNote(Critical = "Calls two safe native methods under OpenCurrentThreadTokenCritical: GetCurrentThread and OpenThreadToken." + "Marshal.GetLastWin32Error captures current thread token in a SecurityCritical field.")] [SecurityCritical] public HostedImpersonationContext() { if (ServiceHostingEnvironment.AspNetCompatibilityEnabled) { int error; bool isSuccess = SafeNativeMethods.OpenCurrentThreadTokenCritical(TokenAccessLevels.Query | TokenAccessLevels.Impersonate, true, out tokenHandle, out error); if (isSuccess) { isImpersonated = true; Interlocked.Increment(ref refCount); } else { CloseInvalidOutSafeHandleCritical(tokenHandle); tokenHandle = null; if (error != SafeNativeMethods.ERROR_NO_TOKEN) { throw FxTrace.Exception.AsError(new Win32Exception(error, SR.Hosting_ImpersonationFailed)); } } } } [Fx.Tag.SecurityNote(Critical = "Calls SetHandleAsInvalid which has a LinkDemand for UnmanagedCode.")] [SecurityCritical] static void CloseInvalidOutSafeHandleCritical(SafeHandle handle) { // Workaround for 64-bit CLR bug VSWhidbey 546830 - sometimes invalid SafeHandles come back null. if (handle != null) { Fx.Assert(handle.IsInvalid, "CloseInvalidOutSafeHandle called with a valid handle!"); // Calls SuppressFinalize. handle.SetHandleAsInvalid(); } } public bool IsImpersonated { [Fx.Tag.SecurityNote(Critical = "Accesses SecurityCritical isImpersonated field.", Safe = "Does not leak control or mutable/harmful data, no potential for harm.")] [SecuritySafeCritical] get { return isImpersonated; } } [Fx.Tag.SecurityNote(Critical = "Accesses SecurityCritical tokenHandle field and uses LinkDemanded DangerousGetHandle method as well as UnsafeCreate." + "Caller should use with care, must take responsibility for reverting impersonation.")] [SecurityCritical] public IDisposable Impersonate() { if (!isImpersonated) return null; Fx.Assert(tokenHandle != null, "The token handle was incorrectly released earlier."); HostedInnerImpersonationContext context = null; lock(tokenHandle) { context = HostedInnerImpersonationContext.UnsafeCreate(tokenHandle.DangerousGetHandle()); GC.KeepAlive(tokenHandle); } return context; } [Fx.Tag.SecurityNote(Critical = "Controls lifetime of token handle, caller must use care.")] [SecurityCritical] public void AddRef() { if (IsImpersonated) { Interlocked.Increment(ref refCount); } } [Fx.Tag.SecurityNote(Critical = "Controls lifetime of token handle, caller must use care.")] [SecurityCritical] public void Release() { if (IsImpersonated) { Fx.Assert(tokenHandle != null, "The token handle is incorrectly released earlier."); int currentCount = Interlocked.Decrement(ref refCount); if (currentCount == 0) { lock(tokenHandle) { tokenHandle.Close(); tokenHandle = null; } } } } [Fx.Tag.SecurityNote(Critical = "Keeps track of impersonated user, caller must use with care and call Dispose at the appropriate time.")] #pragma warning disable 618 // have not moved to the v4 security model yet [SecurityCritical(SecurityCriticalScope.Everything)] #pragma warning restore 618 class HostedInnerImpersonationContext : IDisposable { IDisposable impersonatedContext; HostedInnerImpersonationContext(IDisposable impersonatedContext) { if (impersonatedContext == null) { throw FxTrace.Exception.AsError(new InvalidOperationException(SR.Hosting_ImpersonationFailed)); } this.impersonatedContext = impersonatedContext; } public static HostedInnerImpersonationContext UnsafeCreate(IntPtr token) { return new HostedInnerImpersonationContext(HostingEnvironmentWrapper.UnsafeImpersonate(token)); } public void Dispose() { if (impersonatedContext != null) { impersonatedContext.Dispose(); impersonatedContext = null; } } } } } // 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
- CompositeScriptReference.cs
- FirewallWrapper.cs
- SimpleBitVector32.cs
- ConfigurationException.cs
- CollectionConverter.cs
- RegexReplacement.cs
- SortKey.cs
- FlowDocumentReaderAutomationPeer.cs
- XmlSchemaSubstitutionGroup.cs
- Select.cs
- WebPartConnectionsConnectVerb.cs
- Propagator.cs
- HttpEncoderUtility.cs
- WebResourceAttribute.cs
- EmbeddedMailObject.cs
- ToolStripContentPanel.cs
- SafeSecurityHandles.cs
- DataBindingExpressionBuilder.cs
- HttpPostedFile.cs
- _SslStream.cs
- ArithmeticLiteral.cs
- StreamGeometry.cs
- TemplateBamlRecordReader.cs
- SortAction.cs
- ReadOnlyNameValueCollection.cs
- ErrorHandlingAcceptor.cs
- SignalGate.cs
- CheckBox.cs
- KnownBoxes.cs
- DesignTimeType.cs
- FixedElement.cs
- UnicastIPAddressInformationCollection.cs
- TableLayoutStyle.cs
- UnsafeNativeMethods.cs
- CheckedPointers.cs
- MailWriter.cs
- VisualTreeUtils.cs
- DateTimeUtil.cs
- ReflectionPermission.cs
- DelegatingTypeDescriptionProvider.cs
- QuotedPairReader.cs
- TextInfo.cs
- ConfigurationValue.cs
- WebBrowserNavigatedEventHandler.cs
- BinaryExpressionHelper.cs
- RSAPKCS1KeyExchangeFormatter.cs
- ConnectionModeReader.cs
- ClonableStack.cs
- PolicyChain.cs
- SqlNamer.cs
- BitmapSourceSafeMILHandle.cs
- SubqueryRules.cs
- PolygonHotSpot.cs
- ZipIOModeEnforcingStream.cs
- CompilerResults.cs
- SamlEvidence.cs
- GroupQuery.cs
- TcpTransportManager.cs
- TransformerTypeCollection.cs
- TemplateNameScope.cs
- ConfigXmlReader.cs
- BamlLocalizer.cs
- StatusBarItemAutomationPeer.cs
- CancelRequestedQuery.cs
- InfiniteTimeSpanConverter.cs
- TreeView.cs
- AppManager.cs
- DocumentXmlWriter.cs
- DataObjectEventArgs.cs
- HttpApplicationFactory.cs
- ComplexTypeEmitter.cs
- ListBindingConverter.cs
- DetailsViewDesigner.cs
- EnumerableCollectionView.cs
- WebErrorHandler.cs
- HtmlInputButton.cs
- SwitchElementsCollection.cs
- Random.cs
- LicenseContext.cs
- AppSettingsReader.cs
- MsmqHostedTransportConfiguration.cs
- GridViewHeaderRowPresenter.cs
- ReaderWriterLock.cs
- LassoHelper.cs
- Grammar.cs
- BitmapEffectInputConnector.cs
- Highlights.cs
- SortAction.cs
- DataGridTextBox.cs
- OutputScopeManager.cs
- SchemaObjectWriter.cs
- BaseTemplateParser.cs
- WrappedIUnknown.cs
- TransportReplyChannelAcceptor.cs
- WebPartTransformerCollection.cs
- DatePickerAutomationPeer.cs
- SerializableAttribute.cs
- TreeChangeInfo.cs
- HtmlUtf8RawTextWriter.cs
- DirectionalLight.cs