/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2019 Dominik Reichl <dominik.reichl@t-online.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "StdAfx.h"
#include "FileLock.h"
#include "../../KeePassLibCpp/DataExchange/PwImport.h"
#include "../../KeePassLibCpp/Util/MemUtil.h"
#include "../../KeePassLibCpp/Util/StrUtil.h"
#include "../../KeePassLibCpp/Util/PwUtil.h"
#include "WinUtil.h"
BOOL FileLock_Lock(LPCTSTR lpFile, BOOL bLock)
{
if(lpFile == NULL) return FALSE;
if(lpFile[0] == 0) return FALSE;
CString str = lpFile;
str += FL_LOCK_SUFFIX;
if(bLock == TRUE)
{
PW_TIME t, tAdd;
ZeroMemory(&tAdd, sizeof(PW_TIME));
tAdd.btMinute = FL_TIME_LOCKING;
_GetCurrentPwTime(&t);
_pwtimeadd(&t, &tAdd);
CPwUtil::UnhideFile(str);
FILE *fp = NULL;
_tfopen_s(&fp, str, _T("wb"));
if(fp == NULL) return FALSE;
VERIFY(fwrite(&t, sizeof(PW_TIME), 1, fp) == 1);
const std::basic_string<TCHAR> strUser = WU_GetUserName();
BYTE *pbUTF8 = _StringToUTF8(strUser.c_str());
fwrite(pbUTF8, 1, szlen((char *)pbUTF8) + 1, fp);
fclose(fp); fp = NULL;
CPwUtil::HideFile(str, true);
SAFE_DELETE_ARRAY(pbUTF8);
}
else
{
CPwUtil::UnhideFile(str);
DeleteFile(str);
}
return TRUE;
}
BOOL FileLock_IsLocked(LPCTSTR lpFile, std::basic_string<TCHAR>& strLockingUser)
{
strLockingUser.clear();
if(lpFile == NULL) return FALSE;
if(lpFile[0] == 0) return FALSE;
CString str = lpFile;
str += FL_LOCK_SUFFIX;
unsigned long uFileSize = 0;
char *pData = CPwImport::FileToMemory((LPCTSTR)str, &uFileSize);
if(pData == NULL) return FALSE;
PW_TIME tNow, t;
_GetCurrentPwTime(&tNow);
ZeroMemory(&t, sizeof(PW_TIME));
if(uFileSize >= sizeof(PW_TIME))
memcpy(&t, pData, sizeof(PW_TIME));
if((t.shYear == 0) || (_pwtimecmp(&t, &tNow) < 0))
{
FileLock_Lock(lpFile, FALSE); // Unlock the file
SAFE_DELETE_ARRAY(pData);
return FALSE; // It's not locked any more
}
char *pUser = pData + sizeof(PW_TIME); // pData is null-terminated
TCHAR *tszUser = _UTF8ToString((UTF8_BYTE *)pUser);
if(tszUser != NULL)
{
strLockingUser = tszUser;
SAFE_DELETE_ARRAY(tszUser);
}
SAFE_DELETE_ARRAY(pData);
return TRUE; // File is actively locked
}
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