Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / ProviderBase / DbConnectionPoolIdentity.cs / 1 / DbConnectionPoolIdentity.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace System.Data.ProviderBase { using System; using System.Collections; using System.Data.Common; using System.Diagnostics; using System.Globalization; using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using System.Security; using System.Security.Permissions; using System.Security.Principal; using System.Threading; [Serializable] // Serializable so SqlDependencyProcessDispatcher can marshall cross domain to SqlDependency. sealed internal class DbConnectionPoolIdentity { private const int E_NotImpersonationToken = unchecked((int)0x8007051D); private const int Win32_CheckTokenMembership = 1; private const int Win32_GetTokenInformation_1 = 2; private const int Win32_GetTokenInformation_2 = 3; private const int Win32_ConvertSidToStringSidW = 4; private const int Win32_CreateWellKnownSid = 5; static public readonly DbConnectionPoolIdentity NoIdentity = new DbConnectionPoolIdentity(String.Empty, false, true); static private readonly byte[] NetworkSid = (ADP.IsWindowsNT ? CreateWellKnownSid(WellKnownSidType.NetworkSid) : null); private readonly string _sidString; private readonly bool _isRestricted; private readonly bool _isNetwork; private DbConnectionPoolIdentity (string sidString, bool isRestricted, bool isNetwork) { _sidString = sidString; _isRestricted = isRestricted; _isNetwork = isNetwork; } internal bool IsRestricted { get { return _isRestricted; } } #if !ORACLE internal bool IsNetwork { get { return _isNetwork; } } #endif static private byte[] CreateWellKnownSid(WellKnownSidType sidType) { // Passing an array as big as it can ever be is a small price to pay for // not having to P/Invoke twice (once to get the buffer, once to get the data) uint length = ( uint )SecurityIdentifier.MaxBinaryLength; byte[] resultSid = new byte[ length ]; // NOTE - We copied this code from System.Security.Principal.Win32.CreateWellKnownSid... if ( 0 == UnsafeNativeMethods.CreateWellKnownSid(( int )sidType, null, resultSid, ref length )) { IntegratedSecurityError(Win32_CreateWellKnownSid); } return resultSid; } override public bool Equals(object value) { bool result = ((this == NoIdentity) || (this == value)); if (!result && (null != value)) { DbConnectionPoolIdentity that = ((DbConnectionPoolIdentity) value); result = ((this._sidString == that._sidString) && (this._isRestricted == that._isRestricted) && (this._isNetwork == that._isNetwork)); } return result; } [SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.ControlPrincipal)] static internal WindowsIdentity GetCurrentWindowsIdentity() { return WindowsIdentity.GetCurrent(); } [SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.UnmanagedCode)] static private IntPtr GetWindowsIdentityToken(WindowsIdentity identity) { return identity.Token; } static internal DbConnectionPoolIdentity GetCurrent() { // DEVNOTE: GetTokenInfo and EqualSID do not work on 9x. WindowsIdentity does not // work either on 9x. In fact, after checking with native there is no way // to validate the user on 9x, so simply don't. It is a known issue in // native, and we will handle this the same way. if (!ADP.IsWindowsNT) { return NoIdentity; } WindowsIdentity identity = GetCurrentWindowsIdentity(); IntPtr token = GetWindowsIdentityToken(identity); // Free'd by WindowsIdentity. uint bufferLength = 2048; // Suggested default given by Greg Fee. uint lengthNeeded = 0; IntPtr tokenStruct = IntPtr.Zero; IntPtr SID; IntPtr sidStringBuffer = IntPtr.Zero; bool isNetwork; UnsafeNativeMethods.SetLastError(0); // bool isRestricted = UnsafeNativeMethods.IsTokenRestricted(token); int isRestrictedTestError = Marshal.GetLastWin32Error(); if (0 != isRestrictedTestError) { Marshal.ThrowExceptionForHR(Marshal.GetHRForLastWin32Error()); // will only throw if (hresult < 0) } DbConnectionPoolIdentity current = null; RuntimeHelpers.PrepareConstrainedRegions(); try { if (!UnsafeNativeMethods.CheckTokenMembership(token, NetworkSid, out isNetwork)) { // will always fail with 0x8007051D if token is not an impersonation token IntegratedSecurityError(Win32_CheckTokenMembership); } RuntimeHelpers.PrepareConstrainedRegions(); try { } finally { // allocating memory and assigning to tokenStruct must happen tokenStruct = SafeNativeMethods.LocalAlloc(DbBuffer.LMEM_FIXED, (IntPtr)bufferLength); } if (IntPtr.Zero == tokenStruct) { throw new OutOfMemoryException(); } if (!UnsafeNativeMethods.GetTokenInformation(token, 1, tokenStruct, bufferLength, ref lengthNeeded)) { if (lengthNeeded > bufferLength) { bufferLength = lengthNeeded; RuntimeHelpers.PrepareConstrainedRegions(); try { } finally { // freeing token struct and setting tokenstruct to null must happen together // allocating memory and assigning to tokenStruct must happen SafeNativeMethods.LocalFree(tokenStruct); tokenStruct = IntPtr.Zero; // protect against LocalAlloc throwing an exception tokenStruct = SafeNativeMethods.LocalAlloc(DbBuffer.LMEM_FIXED, (IntPtr)bufferLength); } if (IntPtr.Zero == tokenStruct) { throw new OutOfMemoryException(); } if (!UnsafeNativeMethods.GetTokenInformation(token, 1, tokenStruct, bufferLength, ref lengthNeeded)) { IntegratedSecurityError(Win32_GetTokenInformation_1); } } else { IntegratedSecurityError(Win32_GetTokenInformation_2); } } identity.Dispose(); // Keep identity variable alive until after GetTokenInformation calls. SID = Marshal.ReadIntPtr(tokenStruct, 0); if (!UnsafeNativeMethods.ConvertSidToStringSidW(SID, out sidStringBuffer)) { IntegratedSecurityError(Win32_ConvertSidToStringSidW); } if (IntPtr.Zero == sidStringBuffer) { throw ADP.InternalError(ADP.InternalErrorCode.ConvertSidToStringSidWReturnedNull); } string sidString = Marshal.PtrToStringUni(sidStringBuffer); current = new DbConnectionPoolIdentity(sidString, isRestricted, isNetwork); } finally { // Marshal.FreeHGlobal does not have a ReliabilityContract if (IntPtr.Zero != tokenStruct) { SafeNativeMethods.LocalFree(tokenStruct); tokenStruct = IntPtr.Zero; } if (IntPtr.Zero != sidStringBuffer) { SafeNativeMethods.LocalFree(sidStringBuffer); sidStringBuffer = IntPtr.Zero; } } return current; } override public int GetHashCode() { return (null != _sidString) ? _sidString.GetHashCode() : 0; } static private void IntegratedSecurityError(int caller) { // passing 1,2,3,4,5 instead of true/false so that with a debugger // we could determine more easily which Win32 method call failed int lastError = Marshal.GetHRForLastWin32Error(); if ((Win32_CheckTokenMembership != caller) || (E_NotImpersonationToken != lastError)) { Marshal.ThrowExceptionForHR(lastError); // will only throw if (hresult < 0) } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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