Tyler Gill
83a1dcfb64
InvariantCulture is useful when comparing / sorting human language strings in a culturely correct way. It handles things like accented letters in a way that makes sense to humans (e.g., 'a' should be sorted next to 'á', rather than after 'z'). Ordinal looks just at the raw code points of the characters. As such, it is recommended for use in cases when comparing system strings (file paths, command line parameters, config settings, etc.). Since it doesn't need to use the culture specific sorting rules, this method can often be faster. For more information, see https://stackoverflow.com/questions/492799/difference-between-invariantculture-and-ordinal-string-comparison (and other related questions)
229 lines
9.5 KiB
C#
229 lines
9.5 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.Security.Cryptography;
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using Duplicati.Library.Interface;
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using Duplicati.Library.Utility;
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using System.Text;
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using System.Linq;
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namespace Duplicati.Library.Backend
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{
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public class KeyGenerator : IWebModule
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{
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private const string KEY_TYPE_NAME = "key-type";
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private const string KEY_USERNAME = "key-username";
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private const string KEY_KEYLEN = "key-bits";
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private const string KEY_TEMPLATE_DSA = "-----BEGIN DSA PRIVATE KEY-----\n{0}\n-----END DSA PRIVATE KEY----- \n";
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private const string KEY_TEMPLATE_RSA = "-----BEGIN RSA PRIVATE KEY-----\n{0}\n-----END RSA PRIVATE KEY----- \n";
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private const string PUB_KEY_FORMAT_DSA = "ssh-dss";
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private const string PUB_KEY_FORMAT_RSA = "ssh-rsa";
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private const string KEYTYPE_DSA = "dsa";
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private const string KEYTYPE_RSA = "rsa";
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private readonly string DEFAULT_USERNAME = "backup-user@" + System.Environment.MachineName;
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private const string DEFAULT_KEYTYPE = KEYTYPE_DSA;
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private const int DEFAULT_KEYLEN = 1024;
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private static void EncodePEMLength(System.IO.Stream s, uint length)
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{
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s.WriteByte((byte)((length >> 24) & 0xff));
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s.WriteByte((byte)((length >> 16) & 0xff));
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s.WriteByte((byte)((length >> 8) & 0xff));
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s.WriteByte((byte)(length & 0xff));
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}
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private static void EncodeDERLength(System.IO.Stream s, uint length)
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{
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if (length < 0x7f)
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{
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s.WriteByte((byte)length);
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}
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else if (length <= 0x7fff)
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{
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s.WriteByte(0x82);
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s.WriteByte((byte)((length >> 8) & 0xff));
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s.WriteByte((byte)(length & 0xff));
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}
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else
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{
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s.WriteByte(0x84);
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s.WriteByte((byte)((length >> 24) & 0xff));
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s.WriteByte((byte)((length >> 16) & 0xff));
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s.WriteByte((byte)((length >> 8) & 0xff));
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s.WriteByte((byte)(length & 0xff));
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}
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}
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private static byte[] EncodeDER(byte[][] data)
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{
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byte[] payload;
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using(var ms = new System.IO.MemoryStream())
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{
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foreach(var b in data)
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{
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ms.WriteByte(0x02);
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var isNegative = (b[0] & 0x80) != 0;
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EncodeDERLength(ms, (uint)(b.Length + (isNegative ? 1 : 0)));
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if (isNegative)
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ms.WriteByte(0);
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ms.Write(b, 0, b.Length);
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}
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payload = ms.ToArray();
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}
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using(var ms = new System.IO.MemoryStream())
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{
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ms.WriteByte(0x30);
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EncodeDERLength(ms, (uint)payload.Length);
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ms.Write(payload, 0, payload.Length);
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return ms.ToArray();
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}
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}
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private static byte[] EncodePEM(byte[][] data)
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{
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using(var ms = new System.IO.MemoryStream())
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{
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foreach(var n in data)
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{
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var isNegative = (n[0] & 0x80) != 0;
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EncodePEMLength(ms, (uint)(n.Length + (isNegative ? 1 : 0)));
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if (isNegative)
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ms.WriteByte(0);
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ms.Write(n, 0, n.Length);
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}
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return ms.ToArray();
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}
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}
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private static IDictionary<string, string> OutputKey(byte[] private_key, byte[] public_key, string pem_template, string key_name, string username)
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{
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var res = new Dictionary<string, string>();
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var b64_raw = Convert.ToBase64String(private_key);
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var sb = new StringBuilder();
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var lw = 64;
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for(var i = 0; i < b64_raw.Length; i += lw)
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{
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sb.Append(b64_raw.Substring(i, Math.Min(lw, b64_raw.Length - i)));
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sb.Append("\n");
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}
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var b64 = sb.ToString().Trim();
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var pem = string.Format(pem_template, b64);
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var uri = SSHv2.KEYFILE_URI + Duplicati.Library.Utility.Uri.UrlEncode(pem);
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var pub = key_name + " " + Convert.ToBase64String(public_key) + " " + username;
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res["privkey"] = b64_raw;
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res["privkeyfile"] = pem;
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res["privkeyuri"] = uri;
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res["pubkey"] = pub;
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return res;
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}
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#region IWebModule implementation
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public IDictionary<string, string> Execute(IDictionary<string, string> options)
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{
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string keytype;
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if (!options.TryGetValue(KEY_TYPE_NAME, out keytype))
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keytype = DEFAULT_KEYTYPE;
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string username;
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if (!options.TryGetValue(KEY_USERNAME, out username))
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username = DEFAULT_USERNAME;
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string keylen_s;
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if (!options.TryGetValue(KEY_KEYLEN, out keylen_s))
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keylen_s = "0";
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int keylen;
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if (!int.TryParse(keylen_s, out keylen))
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keylen = DEFAULT_KEYLEN;
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if (KEYTYPE_RSA.Equals(keytype, StringComparison.OrdinalIgnoreCase))
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{
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var rsa = RSACryptoServiceProvider.Create();
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if (keylen > 0)
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rsa.KeySize = keylen;
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else
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rsa.KeySize = DEFAULT_KEYLEN;
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var key = rsa.ExportParameters(true);
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var privateEntries = new byte[][] { new byte[]{ 0x0 }, key.Modulus, key.Exponent, key.D, key.P, key.Q, key.DP, key.DQ, key.InverseQ };
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var publicEntries = new byte[][] {
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System.Text.Encoding.ASCII.GetBytes(PUB_KEY_FORMAT_RSA),
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key.Exponent,
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key.Modulus
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};
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return OutputKey(EncodeDER(privateEntries), EncodePEM(publicEntries), KEY_TEMPLATE_RSA, PUB_KEY_FORMAT_RSA, username);
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}
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else if (KEYTYPE_DSA.Equals(keytype, StringComparison.OrdinalIgnoreCase))
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{
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var dsa = DSACryptoServiceProvider.Create();
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if (keylen > 0)
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dsa.KeySize = keylen;
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else
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dsa.KeySize = DEFAULT_KEYLEN;
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var key = dsa.ExportParameters(true);
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var privateEntries = new byte[][] { new byte[] { 0x0 }, key.P, key.Q, key.G, key.Y, key.X };
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var publicEntries = new byte[][] {
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System.Text.Encoding.ASCII.GetBytes(PUB_KEY_FORMAT_DSA),
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key.P,
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key.Q,
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key.G,
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key.Y
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};
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return OutputKey(EncodeDER(privateEntries), EncodePEM(publicEntries), KEY_TEMPLATE_DSA, PUB_KEY_FORMAT_DSA, username);
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}
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else
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{
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throw new UserInformationException(string.Format("Unsupported key type: {0}", keytype));
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}
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}
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public string Key { get { return "ssh-keygen"; } }
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public string DisplayName { get { return Strings.KeyGenerator.DisplayName; } }
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public string Description { get { return Strings.KeyGenerator.Description; } }
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public IList<ICommandLineArgument> SupportedCommands
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{
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get
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{
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return new List<ICommandLineArgument>(new ICommandLineArgument[] {
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new CommandLineArgument(KEY_KEYLEN, CommandLineArgument.ArgumentType.Integer, Strings.KeyGenerator.KeyLenShort, Strings.KeyGenerator.KeyLenLong, DEFAULT_KEYLEN.ToString(), null, new string[] {"1024", "2048"}),
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new CommandLineArgument(KEY_TYPE_NAME, CommandLineArgument.ArgumentType.Enumeration, Strings.KeyGenerator.KeyTypeShort, Strings.KeyGenerator.KeyTypeLong, DEFAULT_KEYTYPE, null, new string[] {KEYTYPE_DSA, KEYTYPE_RSA}),
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new CommandLineArgument(KEY_USERNAME, CommandLineArgument.ArgumentType.Integer, Strings.KeyGenerator.KeyUsernameShort, Strings.KeyGenerator.KeyUsernameLong, DEFAULT_USERNAME),
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});
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}
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}
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#endregion
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}
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}
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