#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 StartInteractiveClientProcess (
LPTSTR lpszUsername,
// client to log on LPTSTR lpszDomain,
// domain of client's account LPTSTR lpszPassword,
// client's password LPTSTR lpCommandLine
// command line to execute )
{
HANDLE hToken;
HDESK hdesk = NULL;
HWINSTA hwinsta = NULL, hwinstaSave = NULL;
PROCESS_INFORMATION pi;
PSID pSid = NULL;
STARTUPINFO si;
BOOL bResult = FALSE;
// Log the client on to the local computer. if ( ! LogonUser(
lpszUsername,
lpszDomain,
lpszPassword,
LOGON32_LOGON_INTERACTIVE,
LOGON32_PROVIDER_DEFAULT,
& hToken) )
{
goto Cleanup;
}
// Save a handle to the caller's current window station. if ( (hwinstaSave = GetProcessWindowStation() ) == NULL)
goto Cleanup;
// Get a handle to the interactive window station. hwinsta = OpenWindowStation(
" winsta0 " ,
// the interactive window station FALSE,
// handle is not inheritable READ_CONTROL | WRITE_DAC);
// rights to read/write the DACL if (hwinsta == NULL)
goto Cleanup;
// To get the correct default desktop, set the caller's // window station to the interactive window station. if ( ! SetProcessWindowStation(hwinsta))
goto Cleanup;
// Get a handle to the interactive desktop. hdesk = OpenDesktop(
" 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);
// Restore the caller's window station. if ( ! SetProcessWindowStation(hwinstaSave))
goto Cleanup;
if (hdesk == NULL)
goto Cleanup;
// Get the SID for the client's logon session. if ( ! GetLogonSID(hToken, & pSid))
goto Cleanup;
// Allow logon SID full access to interactive window station. if ( ! AddAceToWindowStation(hwinsta, pSid) )
goto Cleanup;
// Allow logon SID full access to interactive desktop. if ( ! AddAceToDesktop(hdesk, pSid) )
goto Cleanup;
// Impersonate client to ensure access to executable file. if ( ! ImpersonateLoggedOnUser(hToken) )
goto Cleanup;
// Initialize the STARTUPINFO structure. // Specify that the process runs in the interactive desktop. ZeroMemory( & si,
sizeof (STARTUPINFO));
si.cb =
sizeof (STARTUPINFO);
si.lpDesktop = TEXT( " winsta0\\default " );
// Launch the process in the client's logon session. bResult = CreateProcessAsUser(
hToken,
// client's access token NULL,
// file to execute lpCommandLine,
// command line NULL,
// pointer to process SECURITY_ATTRIBUTES NULL,
// pointer to thread SECURITY_ATTRIBUTES FALSE,
// handles are not inheritable NORMAL_PRIORITY_CLASS | CREATE_NEW_CONSOLE,
// creation flags NULL,
// pointer to new environment block NULL,
// name of current directory & si,
// pointer to STARTUPINFO structure & pi
// receives information about new process );
// End impersonation of client. RevertToSelf();
if (bResult && pi.hProcess != INVALID_HANDLE_VALUE)
{
WaitForSingleObject(pi.hProcess, INFINITE);
CloseHandle(pi.hProcess);
}
if (pi.hThread != INVALID_HANDLE_VALUE)
CloseHandle(pi.hThread);
Cleanup:
if (hwinstaSave != NULL)
SetProcessWindowStation (hwinstaSave);
// Free the buffer for the logon SID. if (pSid)
FreeLogonSID( & pSid);
// Close the handles to the interactive window station and desktop. if (hwinsta)
CloseWindowStation(hwinsta);
if (hdesk)
CloseDesktop(hdesk);
// Close the handle to the client's access token. if (hToken != INVALID_HANDLE_VALUE)
CloseHandle(hToken);
return bResult;
}
BOOL AddAceToWindowStation(HWINSTA hwinsta, PSID psid)
{
ACCESS_ALLOWED_ACE * pace;
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;
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 =
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;
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;
}