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