454 lines
14 KiB
C++
454 lines
14 KiB
C++
// --------------------------------------------------------------------------
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// Module Name: LogonMutex.cpp
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//
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// Copyright (c) 2001, Microsoft Corporation
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//
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// File that implements a class that manages a single global logon mutex.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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#include "StandardHeader.h"
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#include "LogonMutex.h"
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#include <msginaexports.h>
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#include "Access.h"
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#include "SystemSettings.h"
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DWORD CLogonMutex::s_dwThreadID = 0;
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LONG CLogonMutex::s_lAcquireCount = 0;
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HANDLE CLogonMutex::s_hMutex = NULL;
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HANDLE CLogonMutex::s_hMutexRequest = NULL;
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HANDLE CLogonMutex::s_hEvent = NULL;
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const TCHAR CLogonMutex::s_szLogonMutexName[] = SZ_INTERACTIVE_LOGON_MUTEX_NAME;
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const TCHAR CLogonMutex::s_szLogonRequestMutexName[] = SZ_INTERACTIVE_LOGON_REQUEST_MUTEX_NAME;
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const TCHAR CLogonMutex::s_szLogonReplyEventName[] = SZ_INTERACTIVE_LOGON_REPLY_EVENT_NAME;
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const TCHAR CLogonMutex::s_szShutdownEventName[] = SZ_SHUT_DOWN_EVENT_NAME;
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SID_IDENTIFIER_AUTHORITY CLogonMutex::s_SecurityNTAuthority = SECURITY_NT_AUTHORITY;
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SID_IDENTIFIER_AUTHORITY CLogonMutex::s_SecurityWorldSID = SECURITY_WORLD_SID_AUTHORITY;
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// --------------------------------------------------------------------------
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// CLogonMutex::Acquire
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Acquires the mutex. Ensures that the mutex is only acquired
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// on the main thread of winlogon by an assert. The mutex should
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// never be abandoned within normal execution. However, a
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// process termination can cause this to happen.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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void CLogonMutex::Acquire (void)
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{
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DWORD dwWaitResult;
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ASSERTMSG((s_dwThreadID == 0) || (s_dwThreadID == GetCurrentThreadId()), "Must acquire mutex on initializing thread in CLogonMutex::Acquire");
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if ((s_hMutex != NULL) && (WAIT_TIMEOUT == WaitForSingleObject(s_hEvent, 0)))
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{
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ASSERTMSG(s_lAcquireCount == 0, "Mutex already owned in CLogonMutex::Acquire");
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dwWaitResult = WaitForSingleObject(s_hMutex, INFINITE);
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++s_lAcquireCount;
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}
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}
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// --------------------------------------------------------------------------
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// CLogonMutex::Release
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Releases the mutex. Again makes sure the caller is the main
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// thread of winlogon. The acquisitions and releases are
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// reference counted to allow unbalanced release calls to be
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// made.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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void CLogonMutex::Release (void)
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{
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ASSERTMSG((s_dwThreadID == 0) || (s_dwThreadID == GetCurrentThreadId()), "Must acquire mutex on initializing thread in CLogonMutex::Release");
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if ((s_hMutex != NULL) && (s_lAcquireCount > 0))
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{
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TBOOL(ReleaseMutex(s_hMutex));
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--s_lAcquireCount;
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}
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}
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// --------------------------------------------------------------------------
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// CLogonMutex::SignalReply
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Open the global logon reply event and signal it.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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void CLogonMutex::SignalReply (void)
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{
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HANDLE hEvent;
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hEvent = OpenEvent(EVENT_MODIFY_STATE, FALSE, s_szLogonReplyEventName);
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if (hEvent != NULL)
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{
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TBOOL(SetEvent(hEvent));
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TBOOL(CloseHandle(hEvent));
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}
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}
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// --------------------------------------------------------------------------
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// CLogonMutex::SignalShutdown
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Signal the global shut down event. This will prevent further
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// interactive requests from being processed.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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void CLogonMutex::SignalShutdown (void)
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{
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if (s_hEvent != NULL)
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{
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TBOOL(SetEvent(s_hEvent));
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}
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}
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// --------------------------------------------------------------------------
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// CLogonMutex::StaticInitialize
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Initializes the logon mutex objects based on whether this is
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// session 0 or higher and or what the product type is. Because
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// the initialization for session is done only the once this
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// requires a machine restart for the objects to be created.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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void CLogonMutex::StaticInitialize (void)
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{
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// Check the machine settings. Must be friendly UI and PER/PRO (FUS).
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if (CSystemSettings::IsFriendlyUIActive() && CSystemSettings::IsMultipleUsersEnabled() && CSystemSettings::IsWorkStationProduct())
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{
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DWORD dwErrorCode;
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s_dwThreadID = GetCurrentThreadId();
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s_lAcquireCount = 0;
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// On session 0 create the objects and ACL them.
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if (NtCurrentPeb()->SessionId == 0)
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{
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s_hEvent = CreateShutdownEvent();
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if (s_hEvent != NULL)
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{
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s_hMutex = CreateLogonMutex();
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if (s_hMutex != NULL)
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{
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s_hMutexRequest = CreateLogonRequestMutex();
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if (s_hMutexRequest != NULL)
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{
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Acquire();
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dwErrorCode = ERROR_SUCCESS;
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}
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else
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{
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dwErrorCode = GetLastError();
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}
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}
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else
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{
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dwErrorCode = GetLastError();
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}
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}
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else
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{
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dwErrorCode = GetLastError();
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}
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}
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else
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{
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// For sessions other than 0 open the objects.
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s_hEvent = OpenShutdownEvent();
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if (s_hEvent != NULL)
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{
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if (WAIT_TIMEOUT == WaitForSingleObject(s_hEvent, 0))
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{
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s_hMutex = OpenLogonMutex();
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if (s_hMutex != NULL)
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{
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Acquire();
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dwErrorCode = ERROR_SUCCESS;
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}
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else
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{
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dwErrorCode = GetLastError();
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}
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}
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else
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{
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dwErrorCode = ERROR_SHUTDOWN_IN_PROGRESS;
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}
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}
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else
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{
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dwErrorCode = GetLastError();
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}
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}
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if (ERROR_SUCCESS == dwErrorCode)
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{
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ASSERTMSG(s_hMutex != NULL, "NULL s_hMutex in CLogonMutex::StaticInitialize");
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ASSERTMSG(s_hEvent != NULL, "NULL s_hEvent in CLogonMutex::StaticInitialize");
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}
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else
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{
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ReleaseHandle(s_hEvent);
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ReleaseHandle(s_hMutex);
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s_dwThreadID = 0;
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}
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}
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else
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{
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s_dwThreadID = 0;
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s_lAcquireCount = 0;
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s_hMutex = NULL;
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s_hEvent = NULL;
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}
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}
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// --------------------------------------------------------------------------
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// CLogonMutex::StaticTerminate
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Releases the mutex if held and closes the object handle.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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void CLogonMutex::StaticTerminate (void)
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{
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Release();
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ASSERTMSG(s_lAcquireCount == 0, "Mutex not released in CLogonMutex::StaticTerminate");
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ReleaseHandle(s_hMutex);
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}
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// --------------------------------------------------------------------------
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// CLogonMutex::CreateShutdownEvent
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//
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// Arguments: <none>
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//
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// Returns: HANDLE
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//
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// Purpose: Creates the global shut down event. ACL'd so that anybody can
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// synchronize against it and therefore listen but only SYSTEM
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// can set it to indicate machine shut down has begun.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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HANDLE CLogonMutex::CreateShutdownEvent (void)
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{
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HANDLE hEvent;
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SECURITY_ATTRIBUTES securityAttributes;
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// Build a security descriptor for the event that allows:
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// S-1-5-18 NT AUTHORITY\SYSTEM EVENT_ALL_ACCESS
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// S-1-5-32-544 <local administrators> READ_CONTROL | SYNCHRONIZE
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// S-1-1-0 <everybody> SYNCHRONIZE
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static const CSecurityDescriptor::ACCESS_CONTROL s_AccessControl[] =
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{
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{
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&s_SecurityNTAuthority,
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1,
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SECURITY_LOCAL_SYSTEM_RID,
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0, 0, 0, 0, 0, 0, 0,
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EVENT_ALL_ACCESS
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},
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{
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&s_SecurityNTAuthority,
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2,
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SECURITY_BUILTIN_DOMAIN_RID,
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DOMAIN_ALIAS_RID_ADMINS,
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0, 0, 0, 0, 0, 0,
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READ_CONTROL | SYNCHRONIZE
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},
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{
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&s_SecurityWorldSID,
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1,
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SECURITY_WORLD_RID,
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0, 0, 0, 0, 0, 0, 0,
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SYNCHRONIZE
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}
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};
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securityAttributes.nLength = sizeof(securityAttributes);
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securityAttributes.lpSecurityDescriptor = CSecurityDescriptor::Create(ARRAYSIZE(s_AccessControl), s_AccessControl);
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securityAttributes.bInheritHandle = FALSE;
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hEvent = CreateEvent(&securityAttributes, TRUE, FALSE, s_szShutdownEventName);
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if (securityAttributes.lpSecurityDescriptor != NULL)
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{
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(HLOCAL)LocalFree(securityAttributes.lpSecurityDescriptor);
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}
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return(hEvent);
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}
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// --------------------------------------------------------------------------
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// CLogonMutex::CreateLogonMutex
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//
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// Arguments: <none>
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//
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// Returns: HANDLE
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//
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// Purpose: Creates the global logon mutex. ACL'd so that only SYSTEM can
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// acquire and release the mutex. This is not for user
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// consumption.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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HANDLE CLogonMutex::CreateLogonMutex (void)
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{
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HANDLE hMutex;
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SECURITY_ATTRIBUTES securityAttributes;
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// Build a security descriptor for the mutex that allows:
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// S-1-5-18 NT AUTHORITY\SYSTEM MUTEX_ALL_ACCESS
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static const CSecurityDescriptor::ACCESS_CONTROL s_AccessControl[] =
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{
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{
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&s_SecurityNTAuthority,
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1,
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SECURITY_LOCAL_SYSTEM_RID,
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0, 0, 0, 0, 0, 0, 0,
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MUTEX_ALL_ACCESS
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}
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};
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securityAttributes.nLength = sizeof(securityAttributes);
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securityAttributes.lpSecurityDescriptor = CSecurityDescriptor::Create(ARRAYSIZE(s_AccessControl), s_AccessControl);
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securityAttributes.bInheritHandle = FALSE;
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hMutex = CreateMutex(&securityAttributes, FALSE, s_szLogonMutexName);
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if (securityAttributes.lpSecurityDescriptor != NULL)
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{
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(HLOCAL)LocalFree(securityAttributes.lpSecurityDescriptor);
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}
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return(hMutex);
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}
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// --------------------------------------------------------------------------
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// CLogonMutex::CreateLogonRequestMutex
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//
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// Arguments: <none>
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//
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// Returns: HANDLE
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//
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// Purpose: Creates the logon request mutex for interactive logon
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// requests. For a service to make this request it must acquire
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// the mutex and therefore only a single request can be made at
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// any one time. This is ACL'd so that only SYSTEM can gain
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// access to this object.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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HANDLE CLogonMutex::CreateLogonRequestMutex (void)
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{
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HANDLE hMutex;
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SECURITY_ATTRIBUTES securityAttributes;
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// Build a security descriptor for the mutex that allows:
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// S-1-5-18 NT AUTHORITY\SYSTEM MUTEX_ALL_ACCESS
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static const CSecurityDescriptor::ACCESS_CONTROL s_AccessControl[] =
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{
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{
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&s_SecurityNTAuthority,
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1,
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SECURITY_LOCAL_SYSTEM_RID,
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0, 0, 0, 0, 0, 0, 0,
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MUTEX_ALL_ACCESS
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}
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};
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securityAttributes.nLength = sizeof(securityAttributes);
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securityAttributes.lpSecurityDescriptor = CSecurityDescriptor::Create(ARRAYSIZE(s_AccessControl), s_AccessControl);
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securityAttributes.bInheritHandle = FALSE;
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hMutex = CreateMutex(&securityAttributes, FALSE, s_szLogonRequestMutexName);
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if (securityAttributes.lpSecurityDescriptor != NULL)
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{
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(HLOCAL)LocalFree(securityAttributes.lpSecurityDescriptor);
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}
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return(hMutex);
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}
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// --------------------------------------------------------------------------
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// CLogonMutex::OpenShutdownEvent
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//
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// Arguments: <none>
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//
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// Returns: HANDLE
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//
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// Purpose: Opens a handle to the global shut down event.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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HANDLE CLogonMutex::OpenShutdownEvent (void)
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{
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return(OpenEvent(SYNCHRONIZE | EVENT_MODIFY_STATE, FALSE, s_szShutdownEventName));
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}
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// --------------------------------------------------------------------------
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// CLogonMutex::OpenLogonMutex
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//
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// Arguments: <none>
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//
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// Returns: HANDLE
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//
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// Purpose: Opens a handle to the global logon mutex.
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//
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// History: 2001-04-06 vtan created
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// --------------------------------------------------------------------------
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HANDLE CLogonMutex::OpenLogonMutex (void)
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{
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return(OpenMutex(SYNCHRONIZE | MUTEX_MODIFY_STATE, FALSE, s_szLogonMutexName));
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}
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