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Thread: process username OpenProcess -> OpenProcessToken access denied

  1. #1
    Join Date
    Oct 2005
    Posts
    61

    process username OpenProcess -> OpenProcessToken access denied

    I am getting error while running a .net code. I need some experts help on the same. I am not able to find where I am going wrong. There is as .net code that I found through System.Management.ManagementObject. It runs but it is extremely slow and I am not able to figure out why. Also I am getting access denied error while modifying the process used by it. I had posted the entire code below.
    Code:
    void sysLog( LPTSTR lpFrom )
    {
    WCHAR s[512];
    DWORD dwErr = ::GetLastError();
    ::ZeroMemory( s, 512 );
    
    if( (FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM,
    NULL,
    dwErr,
    0,
    s,
    512,
    NULL ) ) == 0 )
    {
    ::std::wcout << lpFrom <<  L" FormatMessage error ::GetLastError()
    was " << dwErr << std::endl;
    }
    else
    {
    ::std::wcout << lpFrom << L" Error: " << dwErr << L" " << s <<
    std::endl;
    }
    }
    
    
    BOOL SetPrivilege(
    HANDLE hToken,          // access token handle
    LPCTSTR lpszPrivilege,  // name of privilege to enable/disable
    BOOL bEnablePrivilege   // to enable or disable privilege
    )
    {
    TOKEN_PRIVILEGES tp;
    LUID luid;
    
    if ( !LookupPrivilegeValue(
    NULL,            // lookup privilege on local system
    lpszPrivilege,   // privilege to lookup
    &luid ) )        // receives LUID of privilege
    {
    printf("LookupPrivilegeValue error: %u\n", GetLastError() );
    return FALSE;
    }
    
    tp.PrivilegeCount = 1;
    tp.Privileges[0].Luid = luid;
    if (bEnablePrivilege)
    tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
    else
    tp.Privileges[0].Attributes = 0;
    
    // Enable the privilege or disable all privileges.
    
    if ( !AdjustTokenPrivileges(
    hToken,
    FALSE,
    &tp,
    sizeof(TOKEN_PRIVILEGES),
    (PTOKEN_PRIVILEGES) NULL,
    (PDWORD) NULL) )
    {
    printf("AdjustTokenPrivileges error: %u\n", GetLastError() );
    return FALSE;
    }
    
    if (GetLastError() == ERROR_NOT_ALL_ASSIGNED)
    
    {
    printf("The token does not have the specified privilege. \n");
    return FALSE;
    }
    
    return TRUE;
    }
    
    BOOL GetCurrentUserAndDomain(	DWORD dwPID,
    PTSTR szUser, PDWORD pcchUser,
    PTSTR szDomain, PDWORD pcchDomain)
    {
    
    BOOL         fSuccess = FALSE;
    HANDLE       hToken   = NULL;
    PTOKEN_USER  ptiUser  = NULL;
    DWORD        cbti     = 0;
    SID_NAME_USE snu;
    HANDLE hProc = NULL;
    
    HANDLE hProcSelf = NULL;
    HANDLE hTokenSelf   = NULL;
    
    __try
    {
    
    
    
    // not needed if dwPID is the id of this process
    hProcSelf = ::OpenProcess( PROCESS_ALL_ACCESS,
    FALSE,
    ::GetCurrentProcessId() );
    
    ::OpenProcessToken(	hProcSelf,
    TOKEN_ADJUST_PRIVILEGES,
    &hTokenSelf);
    
    SetPrivilege( hTokenSelf, SE_DEBUG_NAME, TRUE );
    
    // always fails
    //SetPrivilege( hTokenSelf, SE_TCB_NAME, TRUE );
    //SetPrivilege( hTokenSelf, SE_IMPERSONATE_NAME, TRUE );
    
    
    hProc = ::OpenProcess(	PROCESS_QUERY_INFORMATION,
    FALSE,
    dwPID );
    
    if( NULL == hProc )
    {
    sysLog( L"OpenProcess" );
    __leave;
    }
    
    // fails here always
    if( 0 == ::OpenProcessToken(	hProc,
    TOKEN_QUERY,
    &hToken))
    {
    sysLog( L"OpenProcessToken" );
    __leave;
    }
    
    // always fails
    //SetPrivilege( hToken, SE_DEBUG_NAME, TRUE );
    //SetPrivilege( hTokenSelf, SE_TCB_NAME, TRUE );
    //SetPrivilege( hToken, SE_IMPERSONATE_NAME, TRUE );
    
    // Obtain the size of the user information in the token.
    if (GetTokenInformation(hToken, TokenUser, NULL, 0, &cbti))
    {
    sysLog( L"GetTokenInformation" );
    // Call should have failed due to zero-length buffer.
    __leave;
    
    }
    else
    {
    // Call should have failed due to zero-length buffer.
    if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
    {
    sysLog( L"GetTokenInformation" );
    __leave;
    }
    }
    
    // Allocate buffer for user information in the token.
    ptiUser = (PTOKEN_USER) HeapAlloc(GetProcessHeap(), 0, cbti);
    if (!ptiUser)
    {
    sysLog( L"GetTokenInformation" );
    __leave;
    }
    
    // Retrieve the user information from the token.
    if (!GetTokenInformation(hToken, TokenUser, ptiUser, cbti, &cbti))
    {
    sysLog( L"GetTokenInformation" );
    __leave;
    }
    
    // Retrieve user name and domain name based on user's SID.
    if (!LookupAccountSid(	NULL, ptiUser->User.Sid, szUser, pcchUser,
    szDomain, pcchDomain, &snu))
    {
    sysLog( L"GetTokenInformation" );
    __leave;
    }
    
    fSuccess = TRUE;
    }
    __finally
    {
    if( hTokenSelf )
    ::CloseHandle( hTokenSelf );
    
    // Free resources.
    if( hProcSelf )
    ::CloseHandle( hProcSelf );
    
    if (hToken)
    ::CloseHandle(hToken);
    
    if (ptiUser)
    ::HeapFree(::GetProcessHeap(), 0, ptiUser);
    
    if( hProc )
    ::CloseHandle( hProc );
    }
    
    return fSuccess;
    }
    // http://win32.mvps.org/
    int _tmain(int argc, _TCHAR* argv[])
    {
    TCHAR szUN[64];
    TCHAR szD[64];
    
    DWORD dwUNSize = 64;
    DWORD dwDSize = 64;
    
    DWORD dwPID = 0;
    
    BOOL bStatus = FALSE;
    
    if( argc == 2 )
    {
    dwPID = (DWORD)_ttoi( argv[1] );
    std::wcout << "Looking up user account for pid: " << dwPID <<
    std::endl;
    bStatus = GetCurrentUserAndDomain( dwPID, szUN, &dwUNSize, szD,
    &dwDSize );
    }
    else
    {
    dwPID = ::GetCurrentProcessId();
    std::wcout << "Looking up user account for current process pid: " <<
    dwPID << std::endl;
    bStatus = GetCurrentUserAndDomain( dwPID, szUN, &dwUNSize, szD,
    &dwDSize );
    }
    
    if( bStatus )
    std::wcout << L"User: " << szUN << " Domain: " << szD << std::endl;
    }

  2. #2
    Join Date
    Oct 2005
    Posts
    32

    Re: process username OpenProcess -> OpenProcessToken access denied

    Here is a small link that has ample of resources on what you are looking for. I will advice you to have a look on the same. I think there is something missing and reading the below article will help you to get more highlight on the same.
    OpenProcessToken function

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