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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2017 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
*/
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;
#if (!KeePassLibSD && !KeePassUAP)
using System.Security.AccessControl;
#endif
using KeePassLib.Native;
using KeePassLib.Resources;
using KeePassLib.Utility;
namespace KeePassLib.Serialization
{
public sealed class FileTransactionEx
{
private bool m_bTransacted;
private IOConnectionInfo m_iocBase;
private IOConnectionInfo m_iocTemp;
private bool m_bMadeUnhidden = false;
private const string StrTempSuffix = ".tmp";
private static Dictionary<string, bool> g_dEnabled =
new Dictionary<string, bool>(StrUtil.CaseIgnoreComparer);
private static bool g_bExtraSafe = false;
internal static bool ExtraSafe
{
get { return g_bExtraSafe; }
set { g_bExtraSafe = value; }
}
public FileTransactionEx(IOConnectionInfo iocBaseFile)
{
Initialize(iocBaseFile, true);
}
public FileTransactionEx(IOConnectionInfo iocBaseFile, bool bTransacted)
{
Initialize(iocBaseFile, bTransacted);
}
private void Initialize(IOConnectionInfo iocBaseFile, bool bTransacted)
{
if(iocBaseFile == null) throw new ArgumentNullException("iocBaseFile");
m_bTransacted = bTransacted;
m_iocBase = iocBaseFile.CloneDeep();
string strPath = m_iocBase.Path;
if(m_iocBase.IsLocalFile())
{
try
{
if(File.Exists(strPath))
{
// Symbolic links are realized via reparse points;
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa365503.aspx
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa365680.aspx
// https://msdn.microsoft.com/en-us/library/windows/desktop/aa365006.aspx
// Performing a file transaction on a symbolic link
// would delete/replace the symbolic link instead of
// writing to its target
FileAttributes fa = File.GetAttributes(strPath);
if((long)(fa & FileAttributes.ReparsePoint) != 0)
m_bTransacted = false;
}
}
catch(Exception) { Debug.Assert(false); }
}
#if !KeePassUAP
// Prevent transactions for FTP URLs under .NET 4.0 in order to
// avoid/workaround .NET bug 621450:
// https://connect.microsoft.com/VisualStudio/feedback/details/621450/problem-renaming-file-on-ftp-server-using-ftpwebrequest-in-net-framework-4-0-vs2010-only
if(strPath.StartsWith("ftp:", StrUtil.CaseIgnoreCmp) &&
(Environment.Version.Major >= 4) && !NativeLib.IsUnix())
m_bTransacted = false;
#endif
foreach(KeyValuePair<string, bool> kvp in g_dEnabled)
{
if(strPath.StartsWith(kvp.Key, StrUtil.CaseIgnoreCmp))
{
m_bTransacted = kvp.Value;
break;
}
}
if(m_bTransacted)
{
m_iocTemp = m_iocBase.CloneDeep();
m_iocTemp.Path += StrTempSuffix;
}
else m_iocTemp = m_iocBase;
}
public Stream OpenWrite()
{
if(!m_bTransacted) m_bMadeUnhidden = UrlUtil.UnhideFile(m_iocTemp.Path);
else // m_bTransacted
{
try { IOConnection.DeleteFile(m_iocTemp); }
catch(Exception) { }
}
return IOConnection.OpenWrite(m_iocTemp);
}
public void CommitWrite()
{
if(m_bTransacted) CommitWriteTransaction();
else // !m_bTransacted
{
if(m_bMadeUnhidden) UrlUtil.HideFile(m_iocTemp.Path, true); // Hide again
}
}
private void CommitWriteTransaction()
{
bool bMadeUnhidden = UrlUtil.UnhideFile(m_iocBase.Path);
#if (!KeePassLibSD && !KeePassUAP)
FileSecurity bkSecurity = null;
bool bEfsEncrypted = false;
#endif
if(g_bExtraSafe)
{
if(!IOConnection.FileExists(m_iocTemp))
throw new FileNotFoundException(m_iocTemp.Path +
MessageService.NewLine + KLRes.FileSaveFailed);
}
if(IOConnection.FileExists(m_iocBase))
{
#if !KeePassLibSD
if(m_iocBase.IsLocalFile())
{
try
{
#if !KeePassUAP
FileAttributes faBase = File.GetAttributes(m_iocBase.Path);
bEfsEncrypted = ((long)(faBase & FileAttributes.Encrypted) != 0);
#endif
DateTime tCreation = File.GetCreationTimeUtc(m_iocBase.Path);
File.SetCreationTimeUtc(m_iocTemp.Path, tCreation);
#if !KeePassUAP
// May throw with Mono
bkSecurity = File.GetAccessControl(m_iocBase.Path);
#endif
}
catch(Exception) { Debug.Assert(NativeLib.IsUnix()); }
}
#endif
IOConnection.DeleteFile(m_iocBase);
}
IOConnection.RenameFile(m_iocTemp, m_iocBase);
#if (!KeePassLibSD && !KeePassUAP)
if(m_iocBase.IsLocalFile())
{
try
{
if(bEfsEncrypted)
{
try { File.Encrypt(m_iocBase.Path); }
catch(Exception) { Debug.Assert(false); }
}
if(bkSecurity != null)
File.SetAccessControl(m_iocBase.Path, bkSecurity);
}
catch(Exception) { Debug.Assert(false); }
}
#endif
if(bMadeUnhidden) UrlUtil.HideFile(m_iocBase.Path, true); // Hide again
}
// For plugins
public static void Configure(string strPrefix, bool? obTransacted)
{
if(string.IsNullOrEmpty(strPrefix)) { Debug.Assert(false); return; }
if(obTransacted.HasValue)
g_dEnabled[strPrefix] = obTransacted.Value;
else g_dEnabled.Remove(strPrefix);
}
}
}
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