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InteractiveSession.cpp
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InteractiveSession.cpp
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// InteractiveSession.cpp: Handling running in different sessions
//
// Copyright (c) Power Admin LLC, 2012 - 2013
//
// This code is provided "as is", with absolutely no warranty expressed
// or implied. Any use is at your own risk.
//
//////////////////////////////////////////////////////////////////////
//this is mostly from:
//http://msdn.microsoft.com/en-us/library/windows/desktop/aa379608(v=vs.85).aspx
#include "stdafx.h"
#include <windows.h>
#include <Tchar.h>
#include <WtsApi32.h>
#include "PAExec.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#define DESKTOP_ALL (DESKTOP_READOBJECTS | DESKTOP_CREATEWINDOW | \
DESKTOP_CREATEMENU | DESKTOP_HOOKCONTROL | DESKTOP_JOURNALRECORD | \
DESKTOP_JOURNALPLAYBACK | DESKTOP_ENUMERATE | DESKTOP_WRITEOBJECTS | \
DESKTOP_SWITCHDESKTOP | STANDARD_RIGHTS_REQUIRED)
#define WINSTA_ALL (WINSTA_ENUMDESKTOPS | WINSTA_READATTRIBUTES | \
WINSTA_ACCESSCLIPBOARD | WINSTA_CREATEDESKTOP | \
WINSTA_WRITEATTRIBUTES | WINSTA_ACCESSGLOBALATOMS | \
WINSTA_EXITWINDOWS | WINSTA_ENUMERATE | WINSTA_READSCREEN | \
STANDARD_RIGHTS_REQUIRED)
#define GENERIC_ACCESS (GENERIC_READ | GENERIC_WRITE | \
GENERIC_EXECUTE | GENERIC_ALL)
BOOL AddAceToWindowStation(HWINSTA hwinsta, PSID psid);
BOOL AddAceToDesktop(HDESK hdesk, PSID psid);
BOOL GetLogonSID (HANDLE hToken, PSID *ppsid);
VOID FreeLogonSID (PSID *ppsid);
BOOL RemoveAceFromWindowStation(HWINSTA hwinsta, PSID psid);
BOOL RemoveAceFromDesktop(HDESK hdesk, PSID psid);
DWORD GetInteractiveSessionID();
BOOL RunningAsLocalSystem();
void CleanUpInteractiveProcess(CleanupInteractive* pCI)
{
SetTokenInformation(pCI->hUser, TokenSessionId, &pCI->origSessionID, sizeof(pCI->origSessionID));
//// Allow logon SID full access to interactive window station.
//RemoveAceFromWindowStation(hwinsta, pSid);
//// Allow logon SID full access to interactive desktop.
//RemoveAceFromDesktop(hdesk, pSid);
//// Free the buffer for the logon SID.
//if (pSid)
// FreeLogonSID(&pSid);
//pSid = NULL;
//// Close the handles to the interactive window station and desktop.
//if (hwinsta)
// CloseWindowStation(hwinsta);
//hwinsta = NULL;
//if (hdesk)
// CloseDesktop(hdesk);
//hdesk = NULL;
}
BOOL PrepForInteractiveProcess(Settings& settings, CleanupInteractive* pCI, DWORD sessionID)
{
pCI->bPreped = true;
//settings.hUser is set as the -u user, Local System (from -s) or as the account the user originally launched PAExec with
//figure out which session we need to go into
Duplicate(settings.hUser, __FILE__, __LINE__);
pCI->hUser = settings.hUser;
DWORD targetSessionID = sessionID;
if((DWORD)-1 == settings.sessionToInteractWith)
{
targetSessionID = GetInteractiveSessionID();
Log(StrFormat(L"Using SessionID %u (interactive session)", targetSessionID), false);
}
else
Log(StrFormat(L"Using SessionID %u from params", targetSessionID), false);
//if(FALSE == WTSQueryUserToken(targetSessionID, &settings.hUser))
// Log(L"Failed to get user from session ", GetLastError());
//Duplicate(settings.hUser, __FILE__, __LINE__);
DWORD returnedLen = 0;
GetTokenInformation(settings.hUser, TokenSessionId, &pCI->origSessionID, sizeof(pCI->origSessionID), &returnedLen);
EnablePrivilege(SE_TCB_NAME, settings.hUser);
if(FALSE == SetTokenInformation(settings.hUser, TokenSessionId, &targetSessionID, sizeof(targetSessionID)))
Log(L"Failed to set interactive token", GetLastError());
return TRUE;
////START FUNKY STUFF
// BOOL bResult = FALSE;
//
// HDESK hdesk = NULL;
// HWINSTA hwinsta = NULL;
// PSID pSid = NULL;
// HWINSTA hwinstaSave = NULL;
//
//
// // Save a handle to the caller's current window station.
// if ((hwinstaSave = GetProcessWindowStation()) == NULL)
// {
// Log(L"Failed to get GetProcessWindowStation.", GetLastError());
// goto Cleanup;
// }
//
// // Get a handle to the interactive window station.
// hwinsta = OpenWindowStation(
// _T("winsta0"), // the interactive window station
// FALSE, // handle is not inheritable
// READ_CONTROL | WRITE_DAC); // rights to read/write the DACL
//
// if (BAD_HANDLE(hwinsta))
// {
// Log(L"Failed to open winsta0.", GetLastError());
// goto Cleanup;
// }
//
// // To get the correct default desktop, set the caller's
// // window station to the interactive window station.
// if (!SetProcessWindowStation(hwinsta))
// {
// Log(L"Failed to SetProcessWindowStation.", GetLastError());
// goto Cleanup;
// }
//
// // Get a handle to the interactive desktop.
// hdesk = OpenDesktop(
// _T("default"), // the interactive window station
// 0, // no interaction with other desktop processes
// FALSE, // handle is not inheritable
// READ_CONTROL | // request the rights to read and write the DACL
// WRITE_DAC |
// DESKTOP_WRITEOBJECTS |
// DESKTOP_READOBJECTS);
//
// DWORD gle = GetLastError();
//
// // Restore the caller's window station.
// //if (!SetProcessWindowStation(hwinstaSave))
// // goto Cleanup;
//
// if (BAD_HANDLE(hdesk))
// {
// Log(L"Failed to get Default desktop.", gle);
// goto Cleanup;
// }
//
// // Get the SID for the client's logon session.
// if (!GetLogonSID(pCI->hUser, &pSid))
// {
// Log(L"Failed to get login SID.", true);
// goto Cleanup;
// }
//
// // Allow logon SID full access to interactive window station.
// if (! AddAceToWindowStation(hwinsta, pSid) )
// {
// Log(L"Failed to add ACE to WinStation.", GetLastError());
// CloseWindowStation(hwinsta);
// hwinsta = NULL; //so it's not removed and cleaned up later
// goto Cleanup;
// }
//
// // Allow logon SID full access to interactive desktop.
// if (! AddAceToDesktop(hdesk, pSid) )
// {
// Log(L"Failed to add ACE to Desktop.", GetLastError());
// CloseDesktop(hdesk);
// hdesk = NULL;
// goto Cleanup;
// }
//
////END FUNKY STUFF
//
// bResult = TRUE;
//
//Cleanup:
// if (!BAD_HANDLE(hwinstaSave))
// SetProcessWindowStation (hwinstaSave);
//
// return bResult;
}
BOOL AddAceToWindowStation(HWINSTA hwinsta, PSID psid)
{
ACCESS_ALLOWED_ACE *pace = NULL;
ACL_SIZE_INFORMATION aclSizeInfo;
BOOL bDaclExist;
BOOL bDaclPresent;
BOOL bSuccess = FALSE;
DWORD dwNewAclSize;
DWORD dwSidSize = 0;
DWORD dwSdSizeNeeded;
PACL pacl;
PACL pNewAcl = NULL;
PSECURITY_DESCRIPTOR psd = NULL;
PSECURITY_DESCRIPTOR psdNew = NULL;
PVOID pTempAce;
SECURITY_INFORMATION si = DACL_SECURITY_INFORMATION;
unsigned int i;
__try
{
// Obtain the DACL for the window station.
if (!GetUserObjectSecurity(
hwinsta,
&si,
psd,
dwSidSize,
&dwSdSizeNeeded)
)
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
psd = (PSECURITY_DESCRIPTOR)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwSdSizeNeeded);
if (psd == NULL)
__leave;
psdNew = (PSECURITY_DESCRIPTOR)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwSdSizeNeeded);
if (psdNew == NULL)
__leave;
dwSidSize = dwSdSizeNeeded;
if (!GetUserObjectSecurity(
hwinsta,
&si,
psd,
dwSidSize,
&dwSdSizeNeeded)
)
__leave;
}
else
__leave;
// Create a new DACL.
if (!InitializeSecurityDescriptor(
psdNew,
SECURITY_DESCRIPTOR_REVISION)
)
__leave;
// Get the DACL from the security descriptor.
if (!GetSecurityDescriptorDacl(
psd,
&bDaclPresent,
&pacl,
&bDaclExist)
)
__leave;
// Initialize the ACL.
ZeroMemory(&aclSizeInfo, sizeof(ACL_SIZE_INFORMATION));
aclSizeInfo.AclBytesInUse = sizeof(ACL);
// Call only if the DACL is not NULL.
if (pacl != NULL)
{
// get the file ACL size info
if (!GetAclInformation(
pacl,
(LPVOID)&aclSizeInfo,
sizeof(ACL_SIZE_INFORMATION),
AclSizeInformation)
)
__leave;
}
// Compute the size of the new ACL.
dwNewAclSize = aclSizeInfo.AclBytesInUse +
(2*sizeof(ACCESS_ALLOWED_ACE)) + (2*GetLengthSid(psid)) -
(2*sizeof(DWORD));
// Allocate memory for the new ACL.
pNewAcl = (PACL)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwNewAclSize);
if (pNewAcl == NULL)
__leave;
// Initialize the new DACL.
if (!InitializeAcl(pNewAcl, dwNewAclSize, ACL_REVISION))
__leave;
// If DACL is present, copy it to a new DACL.
if (bDaclPresent)
{
// Copy the ACEs to the new ACL.
if (aclSizeInfo.AceCount)
{
for (i=0; i < aclSizeInfo.AceCount; i++)
{
// Get an ACE.
if (!GetAce(pacl, i, &pTempAce))
__leave;
// Add the ACE to the new ACL.
if (!AddAce(
pNewAcl,
ACL_REVISION,
MAXDWORD,
pTempAce,
((PACE_HEADER)pTempAce)->AceSize)
)
__leave;
}
}
}
// Add the first ACE to the window station.
pace = (ACCESS_ALLOWED_ACE *)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
sizeof(ACCESS_ALLOWED_ACE) + GetLengthSid(psid) -
sizeof(DWORD));
if (pace == NULL)
__leave;
pace->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
pace->Header.AceFlags = CONTAINER_INHERIT_ACE |
INHERIT_ONLY_ACE | OBJECT_INHERIT_ACE;
pace->Header.AceSize = LOWORD(sizeof(ACCESS_ALLOWED_ACE) +
GetLengthSid(psid) - sizeof(DWORD));
pace->Mask = GENERIC_ACCESS;
if (!CopySid(GetLengthSid(psid), &pace->SidStart, psid))
__leave;
if (!AddAce(
pNewAcl,
ACL_REVISION,
MAXDWORD,
(LPVOID)pace,
pace->Header.AceSize)
)
__leave;
// Add the second ACE to the window station.
pace->Header.AceFlags = NO_PROPAGATE_INHERIT_ACE;
pace->Mask = WINSTA_ALL;
if (!AddAce(
pNewAcl,
ACL_REVISION,
MAXDWORD,
(LPVOID)pace,
pace->Header.AceSize)
)
__leave;
// Set a new DACL for the security descriptor.
if (!SetSecurityDescriptorDacl(
psdNew,
TRUE,
pNewAcl,
FALSE)
)
__leave;
// Set the new security descriptor for the window station.
if (!SetUserObjectSecurity(hwinsta, &si, psdNew))
__leave;
// Indicate success.
bSuccess = TRUE;
}
__finally
{
// Free the allocated buffers.
if (pace != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)pace);
if (pNewAcl != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)pNewAcl);
if (psd != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)psd);
if (psdNew != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)psdNew);
}
return bSuccess;
}
BOOL AddAceToDesktop(HDESK hdesk, PSID psid)
{
ACL_SIZE_INFORMATION aclSizeInfo;
BOOL bDaclExist;
BOOL bDaclPresent;
BOOL bSuccess = FALSE;
DWORD dwNewAclSize;
DWORD dwSidSize = 0;
DWORD dwSdSizeNeeded;
PACL pacl;
PACL pNewAcl = NULL;
PSECURITY_DESCRIPTOR psd = NULL;
PSECURITY_DESCRIPTOR psdNew = NULL;
PVOID pTempAce;
SECURITY_INFORMATION si = DACL_SECURITY_INFORMATION;
unsigned int i;
__try
{
// Obtain the security descriptor for the desktop object.
if (!GetUserObjectSecurity(
hdesk,
&si,
psd,
dwSidSize,
&dwSdSizeNeeded))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
psd = (PSECURITY_DESCRIPTOR)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwSdSizeNeeded );
if (psd == NULL)
__leave;
psdNew = (PSECURITY_DESCRIPTOR)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwSdSizeNeeded);
if (psdNew == NULL)
__leave;
dwSidSize = dwSdSizeNeeded;
if (!GetUserObjectSecurity(
hdesk,
&si,
psd,
dwSidSize,
&dwSdSizeNeeded)
)
__leave;
}
else
__leave;
}
// Create a new security descriptor.
if (!InitializeSecurityDescriptor(
psdNew,
SECURITY_DESCRIPTOR_REVISION)
)
__leave;
// Obtain the DACL from the security descriptor.
if (!GetSecurityDescriptorDacl(
psd,
&bDaclPresent,
&pacl,
&bDaclExist)
)
__leave;
// Initialize.
ZeroMemory(&aclSizeInfo, sizeof(ACL_SIZE_INFORMATION));
aclSizeInfo.AclBytesInUse = sizeof(ACL);
// Call only if NULL DACL.
if (pacl != NULL)
{
// Determine the size of the ACL information.
if (!GetAclInformation(
pacl,
(LPVOID)&aclSizeInfo,
sizeof(ACL_SIZE_INFORMATION),
AclSizeInformation)
)
__leave;
}
// Compute the size of the new ACL.
dwNewAclSize = aclSizeInfo.AclBytesInUse +
sizeof(ACCESS_ALLOWED_ACE) +
GetLengthSid(psid) - sizeof(DWORD);
// Allocate buffer for the new ACL.
pNewAcl = (PACL)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwNewAclSize);
if (pNewAcl == NULL)
__leave;
// Initialize the new ACL.
if (!InitializeAcl(pNewAcl, dwNewAclSize, ACL_REVISION))
__leave;
// If DACL is present, copy it to a new DACL.
if (bDaclPresent)
{
// Copy the ACEs to the new ACL.
if (aclSizeInfo.AceCount)
{
for (i=0; i < aclSizeInfo.AceCount; i++)
{
// Get an ACE.
if (!GetAce(pacl, i, &pTempAce))
__leave;
// Add the ACE to the new ACL.
if (!AddAce(
pNewAcl,
ACL_REVISION,
MAXDWORD,
pTempAce,
((PACE_HEADER)pTempAce)->AceSize)
)
__leave;
}
}
}
// Add ACE to the DACL.
if (!AddAccessAllowedAce(
pNewAcl,
ACL_REVISION,
DESKTOP_ALL,
psid)
)
__leave;
// Set new DACL to the new security descriptor.
if (!SetSecurityDescriptorDacl(
psdNew,
TRUE,
pNewAcl,
FALSE)
)
__leave;
// Set the new security descriptor for the desktop object.
if (!SetUserObjectSecurity(hdesk, &si, psdNew))
__leave;
// Indicate success.
bSuccess = TRUE;
}
__finally
{
// Free buffers.
if (pNewAcl != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)pNewAcl);
if (psd != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)psd);
if (psdNew != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)psdNew);
}
return bSuccess;
}
BOOL RemoveAceFromWindowStation(HWINSTA hwinsta, PSID psid)
{
ACL_SIZE_INFORMATION aclSizeInfo;
BOOL bDaclExist;
BOOL bDaclPresent;
BOOL bSuccess = FALSE;
DWORD dwNewAclSize;
DWORD dwSidSize = 0;
DWORD dwSdSizeNeeded;
PACL pacl;
PACL pNewAcl;
PSECURITY_DESCRIPTOR psd = NULL;
PSECURITY_DESCRIPTOR psdNew = NULL;
ACCESS_ALLOWED_ACE* pTempAce;
SECURITY_INFORMATION si = DACL_SECURITY_INFORMATION;
unsigned int i;
__try
{
// Obtain the DACL for the window station.
if (!GetUserObjectSecurity(
hwinsta,
&si,
psd,
dwSidSize,
&dwSdSizeNeeded)
)
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
psd = (PSECURITY_DESCRIPTOR)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwSdSizeNeeded);
if (psd == NULL)
__leave;
psdNew = (PSECURITY_DESCRIPTOR)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwSdSizeNeeded);
if (psdNew == NULL)
__leave;
dwSidSize = dwSdSizeNeeded;
if (!GetUserObjectSecurity(
hwinsta,
&si,
psd,
dwSidSize,
&dwSdSizeNeeded)
)
__leave;
}
else
__leave;
// Create a new DACL.
if (!InitializeSecurityDescriptor(
psdNew,
SECURITY_DESCRIPTOR_REVISION)
)
__leave;
// Get the DACL from the security descriptor.
if (!GetSecurityDescriptorDacl(
psd,
&bDaclPresent,
&pacl,
&bDaclExist)
)
__leave;
// Initialize the ACL.
ZeroMemory(&aclSizeInfo, sizeof(ACL_SIZE_INFORMATION));
aclSizeInfo.AclBytesInUse = sizeof(ACL);
// Call only if the DACL is not NULL.
if (pacl != NULL)
{
// get the file ACL size info
if (!GetAclInformation(
pacl,
(LPVOID)&aclSizeInfo,
sizeof(ACL_SIZE_INFORMATION),
AclSizeInformation)
)
__leave;
}
// Compute the size of the new ACL.
dwNewAclSize = aclSizeInfo.AclBytesInUse +
(2*sizeof(ACCESS_ALLOWED_ACE)) + (2*GetLengthSid(psid)) -
(2*sizeof(DWORD));
// Allocate memory for the new ACL.
pNewAcl = (PACL)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwNewAclSize);
if (pNewAcl == NULL)
__leave;
// Initialize the new DACL.
if (!InitializeAcl(pNewAcl, dwNewAclSize, ACL_REVISION))
__leave;
// If DACL is present, copy it to a new DACL.
if (bDaclPresent)
{
// Copy the ACEs to the new ACL.
if (aclSizeInfo.AceCount)
{
for (i=0; i < aclSizeInfo.AceCount; i++)
{
// Get an ACE.
if (!GetAce(pacl, i, reinterpret_cast<void**>(&pTempAce)))
__leave;
if ( !EqualSid( psid, &pTempAce->SidStart ) )
{
// Add the ACE to the new ACL.
if (!AddAce(
pNewAcl,
ACL_REVISION,
MAXDWORD,
pTempAce,
((PACE_HEADER)pTempAce)->AceSize)
)
__leave;
}
}
}
}
if( pacl != NULL )
HeapFree(GetProcessHeap(), 0, (LPVOID)pacl);
// Set a new DACL for the security descriptor.
if (!SetSecurityDescriptorDacl(
psdNew,
TRUE,
pNewAcl,
FALSE)
)
__leave;
// Set the new security descriptor for the window station.
if (!SetUserObjectSecurity(hwinsta, &si, psdNew))
__leave;
// Indicate success.
bSuccess = TRUE;
}
__finally
{
// Free the allocated buffers.
if( pacl != NULL )
HeapFree(GetProcessHeap(), 0, (LPVOID)pacl);
if (pNewAcl != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)pNewAcl);
if (psd != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)psd);
if (psdNew != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)psdNew);
}
return bSuccess;
}
BOOL RemoveAceFromDesktop(HDESK hdesk, PSID psid)
{
ACL_SIZE_INFORMATION aclSizeInfo;
BOOL bDaclExist;
BOOL bDaclPresent;
BOOL bSuccess = FALSE;
DWORD dwNewAclSize;
DWORD dwSidSize = 0;
DWORD dwSdSizeNeeded;
PACL pacl;
PACL pNewAcl;
PSECURITY_DESCRIPTOR psd = NULL;
PSECURITY_DESCRIPTOR psdNew = NULL;
ACCESS_ALLOWED_ACE* pTempAce;
SECURITY_INFORMATION si = DACL_SECURITY_INFORMATION;
unsigned int i;
__try
{
// Obtain the security descriptor for the desktop object.
if (!GetUserObjectSecurity(
hdesk,
&si,
psd,
dwSidSize,
&dwSdSizeNeeded))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
psd = (PSECURITY_DESCRIPTOR)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwSdSizeNeeded );
if (psd == NULL)
__leave;
psdNew = (PSECURITY_DESCRIPTOR)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwSdSizeNeeded);
if (psdNew == NULL)
__leave;
dwSidSize = dwSdSizeNeeded;
if (!GetUserObjectSecurity(
hdesk,
&si,
psd,
dwSidSize,
&dwSdSizeNeeded)
)
__leave;
}
else
__leave;
}
// Create a new security descriptor.
if (!InitializeSecurityDescriptor(
psdNew,
SECURITY_DESCRIPTOR_REVISION)
)
__leave;
// Obtain the DACL from the security descriptor.
if (!GetSecurityDescriptorDacl(
psd,
&bDaclPresent,
&pacl,
&bDaclExist)
)
__leave;
// Initialize.
ZeroMemory(&aclSizeInfo, sizeof(ACL_SIZE_INFORMATION));
aclSizeInfo.AclBytesInUse = sizeof(ACL);
// Call only if NULL DACL.
if (pacl != NULL)
{
// Determine the size of the ACL information.
if (!GetAclInformation(
pacl,
(LPVOID)&aclSizeInfo,
sizeof(ACL_SIZE_INFORMATION),
AclSizeInformation)
)
__leave;
}
// Compute the size of the new ACL.
dwNewAclSize = aclSizeInfo.AclBytesInUse +
sizeof(ACCESS_ALLOWED_ACE) +
GetLengthSid(psid) - sizeof(DWORD);
// Allocate buffer for the new ACL.
pNewAcl = (PACL)HeapAlloc(
GetProcessHeap(),
HEAP_ZERO_MEMORY,
dwNewAclSize);
if (pNewAcl == NULL)
__leave;
// Initialize the new ACL.
if (!InitializeAcl(pNewAcl, dwNewAclSize, ACL_REVISION))
__leave;
// If DACL is present, copy it to a new DACL.
if (bDaclPresent)
{
// Copy the ACEs to the new ACL.
if (aclSizeInfo.AceCount)
{
for (i=0; i < aclSizeInfo.AceCount; i++)
{
// Get an ACE.
if (!GetAce(pacl, i, reinterpret_cast<void**>(&pTempAce)))
__leave;
if ( !EqualSid( psid, &pTempAce->SidStart ) )
{
// Add the ACE to the new ACL.
if (!AddAce(
pNewAcl,
ACL_REVISION,
MAXDWORD,
pTempAce,
((PACE_HEADER)pTempAce)->AceSize)
)
__leave;
}
}
}
}
// Set new DACL to the new security descriptor.
if (!SetSecurityDescriptorDacl(
psdNew,
TRUE,
pNewAcl,
FALSE)
)
__leave;
// Set the new security descriptor for the desktop object.
if (!SetUserObjectSecurity(hdesk, &si, psdNew))
__leave;
// Indicate success.
bSuccess = TRUE;
}
__finally
{
// Free buffers.
if( pacl != NULL )
HeapFree(GetProcessHeap(), 0, (LPVOID)pacl);
if (pNewAcl != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)pNewAcl);
if (psd != NULL)
HeapFree(GetProcessHeap(), 0, (LPVOID)psd);