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.
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