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// Copyright (C) 2015, The Duplicati Team
// http://www.duplicati.com, info@duplicati.com
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
using System;
using System.Collections.Generic;
using System.IO;
using Newtonsoft.Json;
using System.Text;
using Duplicati.Library.Main.Database;
namespace Duplicati.Library.Main
{
public class Utility
{
/// <summary>
/// Implementation of the IMetahash interface
/// </summary>
private class Metahash : IMetahash
{
/// <summary>
/// The base64 encoded hash
/// </summary>
private readonly string m_filehash;
/// <summary>
/// The UTF-8 encoded json element with the metadata
/// </summary>
private readonly byte[] m_blob;
/// <summary>
/// The lookup table with elements
/// </summary>
private readonly Dictionary<string, string> m_values;
public Metahash(Dictionary<string, string> values, Options options)
{
m_values = values;
using (var ms = new System.IO.MemoryStream())
using (var w = new StreamWriter(ms, Encoding.UTF8))
using(var filehasher = Library.Utility.HashAlgorithmHelper.Create(options.FileHashAlgorithm))
{
if (filehasher == null)
throw new Duplicati.Library.Interface.UserInformationException(Strings.Common.InvalidHashAlgorithm(options.FileHashAlgorithm));
w.Write(JsonConvert.SerializeObject(values));
w.Flush();
m_blob = ms.ToArray();
ms.Position = 0;
m_filehash = Convert.ToBase64String(filehasher.ComputeHash(ms));
}
}
public string FileHash
{
get { return m_filehash; }
}
public long Size
{
get { return m_blob.Length; }
}
public byte[] Blob
{
get { return m_blob; }
}
public Dictionary<string, string> Values
{
get { return m_values; }
}
}
/// <summary>
/// Constructs a container for a given metadata dictionary
/// </summary>
/// <param name="values">The metadata values to wrap</param>
/// <returns>A IMetahash instance</returns>
public static IMetahash WrapMetadata(Dictionary<string, string> values, Options options)
{
return new Metahash(values, options);
}
internal static void UpdateOptionsFromDb(LocalDatabase db, Options options, System.Data.IDbTransaction transaction = null)
{
string n = null;
var opts = db.GetDbOptions(transaction);
if(opts.ContainsKey("blocksize") && (!options.RawOptions.TryGetValue("blocksize", out n) || string.IsNullOrEmpty(n)))
options.RawOptions["blocksize"] = opts["blocksize"] + "b";
if (opts.ContainsKey("blockhash") && (!options.RawOptions.TryGetValue("block-hash-algorithm", out n) || string.IsNullOrEmpty(n)))
options.RawOptions["block-hash-algorithm"] = opts["blockhash"];
if (opts.ContainsKey("filehash") && (!options.RawOptions.TryGetValue("file-hash-algorithm", out n) || string.IsNullOrEmpty(n)))
options.RawOptions["file-hash-algorithm"] = opts["filehash"];
}
internal static void VerifyParameters(LocalDatabase db, Options options, System.Data.IDbTransaction transaction = null)
{
var newDict = new Dictionary<string, string>();
newDict.Add("blocksize", options.Blocksize.ToString());
newDict.Add("blockhash", options.BlockHashAlgorithm);
newDict.Add("filehash", options.FileHashAlgorithm);
var opts = db.GetDbOptions(transaction);
if (options.NoEncryption)
{
newDict.Add("passphrase", "no-encryption");
}
else
{
string salt;
opts.TryGetValue("passphrase-salt", out salt);
if (string.IsNullOrEmpty(salt))
{
// Not Crypto-class PRNG salts
var buf = new byte[32];
new Random().NextBytes(buf);
//Add version so we can detect and change the algorithm
salt = "v1:" + Library.Utility.Utility.ByteArrayAsHexString(buf);
}
newDict["passphrase-salt"] = salt;
// We avoid storing the passphrase directly,
// instead we salt and rehash repeatedly
newDict.Add("passphrase", Library.Utility.Utility.ByteArrayAsHexString(Library.Utility.Utility.RepeatedHashWithSalt(options.Passphrase, salt, 1200)));
}
var needsUpdate = false;
foreach(var k in newDict)
if (!opts.ContainsKey(k.Key))
needsUpdate = true;
else if (opts[k.Key] != k.Value)
{
if (k.Key == "passphrase")
{
if (!options.AllowPassphraseChange)
{
if (newDict[k.Key] == "no-encryption")
throw new Duplicati.Library.Interface.UserInformationException("You have attempted to remove the passphrase on an existing backup, which is not supported. Please configure a new clean backup if you want to remove the passphrase.");
else if (opts[k.Key] == "no-encryption")
throw new Duplicati.Library.Interface.UserInformationException("You have attempted to add a passphrase to an existing backup, which is not supported. Please configure a new clean backup if you want to add a passphrase.");
else
throw new Duplicati.Library.Interface.UserInformationException("You have attempted to change a passphrase to an existing backup, which is not supported. Please configure a new clean backup if you want to change the passphrase.");
}
}
else
throw new Duplicati.Library.Interface.UserInformationException(string.Format("You have attempted to change the parameter \"{0}\" from \"{1}\" to \"{2}\", which is not supported. Please configure a new clean backup if you want to change the parameter.", k.Key, opts[k.Key], k.Value));
}
//Extra sanity check
if (db.GetBlocksLargerThan(options.Blocksize) > 0)
throw new Duplicati.Library.Interface.UserInformationException("You have attempted to change the block-size on an existing backup, which is not supported. Please configure a new clean backup if you want to change the block-size.");
if (needsUpdate)
{
// Make sure we do not loose values
foreach(var k in opts)
if (!newDict.ContainsKey(k.Key))
newDict[k.Key] = k.Value;
db.SetDbOptions(newDict, transaction);
}
}
/// <summary>
/// The filename for the marker file that the user can add to suppress donation messages
/// </summary>
private const string SUPPRESS_DONATIONS_FILENAME = "suppress_donation_messages.txt";
/// <summary>
/// Gets or sets donation message suppression
/// </summary>
public static bool SuppressDonationMessages
{
get
{
try
{
var folder = Path.Combine(System.Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), AutoUpdater.AutoUpdateSettings.AppName);
return File.Exists(Path.Combine(folder, SUPPRESS_DONATIONS_FILENAME));
}
catch
{
}
return true;
}
set
{
try
{
var folder = Path.Combine(System.Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), AutoUpdater.AutoUpdateSettings.AppName);
if (!Directory.Exists(folder))
Directory.CreateDirectory(folder);
var path = Path.Combine(folder, SUPPRESS_DONATIONS_FILENAME);
if (value)
using(File.OpenWrite(path))
{
}
else
File.Delete(path);
}
catch
{
}
}
}
}
}
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