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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2021 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.Diagnostics;
using System.IO;
using System.Security;
#if !KeePassUAP
using System.Security.Cryptography;
#endif
using KeePassLib.Cryptography;
using KeePassLib.Resources;
using KeePassLib.Security;
using KeePassLib.Utility;
namespace KeePassLib.Keys
{
/// <summary>
/// A user key depending on the currently logged on Windows user account.
/// </summary>
public sealed class KcpUserAccount : IUserKey
{
private ProtectedBinary m_pbKeyData = null;
// Constant initialization vector (unique for KeePass)
private static readonly byte[] m_pbEntropy = new byte[] {
0xDE, 0x13, 0x5B, 0x5F, 0x18, 0xA3, 0x46, 0x70,
0xB2, 0x57, 0x24, 0x29, 0x69, 0x88, 0x98, 0xE6
};
private const string UserKeyFileName = "ProtectedUserKey.bin";
/// <summary>
/// Get key data. Querying this property is fast (it returns a
/// reference to a cached <c>ProtectedBinary</c> object).
/// If no key data is available, <c>null</c> is returned.
/// </summary>
public ProtectedBinary KeyData
{
get { return m_pbKeyData; }
}
/// <summary>
/// Construct a user account key.
/// </summary>
public KcpUserAccount()
{
if(!CryptoUtil.IsProtectedDataSupported)
throw new PlatformNotSupportedException(); // Windows 98/ME
byte[] pbKey = LoadUserKey(false);
if(pbKey == null) pbKey = CreateUserKey();
if(pbKey == null) // Should never happen
{
Debug.Assert(false);
throw new SecurityException(KLRes.UserAccountKeyError);
}
m_pbKeyData = new ProtectedBinary(true, pbKey);
MemUtil.ZeroByteArray(pbKey);
}
// public void Clear()
// {
// m_pbKeyData = null;
// }
private static string GetUserKeyFilePath(bool bCreate)
{
#if KeePassUAP
string strUserDir = EnvironmentExt.AppDataRoamingFolderPath;
#else
string strUserDir = Environment.GetFolderPath(
Environment.SpecialFolder.ApplicationData);
#endif
strUserDir = UrlUtil.EnsureTerminatingSeparator(strUserDir, false);
strUserDir += PwDefs.ShortProductName;
if(bCreate && !Directory.Exists(strUserDir))
Directory.CreateDirectory(strUserDir);
strUserDir = UrlUtil.EnsureTerminatingSeparator(strUserDir, false);
return (strUserDir + UserKeyFileName);
}
private static byte[] LoadUserKey(bool bThrow)
{
byte[] pbKey = null;
#if !KeePassLibSD
try
{
string strFilePath = GetUserKeyFilePath(false);
byte[] pbProtectedKey = File.ReadAllBytes(strFilePath);
pbKey = CryptoUtil.UnprotectData(pbProtectedKey, m_pbEntropy,
DataProtectionScope.CurrentUser);
}
catch(Exception)
{
if(bThrow) throw;
pbKey = null;
}
#endif
return pbKey;
}
private static byte[] CreateUserKey()
{
#if KeePassLibSD
return null;
#else
string strFilePath = GetUserKeyFilePath(true);
byte[] pbRandomKey = CryptoRandom.Instance.GetRandomBytes(64);
byte[] pbProtectedKey = CryptoUtil.ProtectData(pbRandomKey,
m_pbEntropy, DataProtectionScope.CurrentUser);
File.WriteAllBytes(strFilePath, pbProtectedKey);
byte[] pbKey = LoadUserKey(true);
Debug.Assert(MemUtil.ArraysEqual(pbKey, pbRandomKey));
MemUtil.ZeroByteArray(pbRandomKey);
return pbKey;
#endif
}
}
}
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