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Viewing changes to contrib/NSch/NSch/KeyExchange.cs

  • Committer: Bazaar Package Importer
  • Author(s): Jo Shields
  • Date: 2011-06-27 17:03:13 UTC
  • mto: (1.8.1 upstream)
  • mto: This revision was merged to the branch mainline in revision 54.
  • Revision ID: james.westby@ubuntu.com-20110627170313-6cvz3s19x6e9hqe9
Import upstream version 2.5.92+dfsg

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contrib/NSch/NSch/KeyExchange.cs
 
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/*
 
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Copyright (c) 2006-2010 ymnk, JCraft,Inc. All rights reserved.
 
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Redistribution and use in source and binary forms, with or without
 
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modification, are permitted provided that the following conditions are met:
 
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  1. Redistributions of source code must retain the above copyright notice,
 
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     this list of conditions and the following disclaimer.
 
9
 
 
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  2. Redistributions in binary form must reproduce the above copyright 
 
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     notice, this list of conditions and the following disclaimer in 
 
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     the documentation and/or other materials provided with the distribution.
 
13
 
 
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  3. The names of the authors may not be used to endorse or promote products
 
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     derived from this software without specific prior written permission.
 
16
 
 
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
 
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INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
 
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 
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OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
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This code is based on jsch (http://www.jcraft.com/jsch).
 
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All credit should go to the authors of jsch.
 
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*/
 
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using System;
 
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using NSch;
 
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using Sharpen;
 
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namespace NSch
 
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{
 
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        public abstract class KeyExchange
 
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        {
 
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                internal const int PROPOSAL_KEX_ALGS = 0;
 
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                internal const int PROPOSAL_SERVER_HOST_KEY_ALGS = 1;
 
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                internal const int PROPOSAL_ENC_ALGS_CTOS = 2;
 
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                internal const int PROPOSAL_ENC_ALGS_STOC = 3;
 
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                internal const int PROPOSAL_MAC_ALGS_CTOS = 4;
 
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                internal const int PROPOSAL_MAC_ALGS_STOC = 5;
 
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                internal const int PROPOSAL_COMP_ALGS_CTOS = 6;
 
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                internal const int PROPOSAL_COMP_ALGS_STOC = 7;
 
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                internal const int PROPOSAL_LANG_CTOS = 8;
 
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                internal const int PROPOSAL_LANG_STOC = 9;
 
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                internal const int PROPOSAL_MAX = 10;
 
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                internal static string kex = "diffie-hellman-group1-sha1";
 
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                internal static string server_host_key = "ssh-rsa,ssh-dss";
 
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                internal static string enc_c2s = "blowfish-cbc";
 
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                internal static string enc_s2c = "blowfish-cbc";
 
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                internal static string mac_c2s = "hmac-md5";
 
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                internal static string mac_s2c = "hmac-md5";
 
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                internal static string lang_c2s = string.Empty;
 
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                internal static string lang_s2c = string.Empty;
 
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                public const int STATE_END = 0;
 
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                protected internal Session session = null;
 
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                protected internal HASH sha = null;
 
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                protected internal byte[] K = null;
 
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                protected internal byte[] H = null;
 
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                protected internal byte[] K_S = null;
 
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                //static String kex_algs="diffie-hellman-group-exchange-sha1"+
 
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                //                       ",diffie-hellman-group1-sha1";
 
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                //static String kex="diffie-hellman-group-exchange-sha1";
 
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                // hmac-md5,hmac-sha1,hmac-ripemd160,
 
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                // hmac-sha1-96,hmac-md5-96
 
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                //static String comp_c2s="none";        // zlib
 
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                //static String comp_s2c="none";
 
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                /// <exception cref="System.Exception"></exception>
 
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                public abstract void Init(Session session, byte[] V_S, byte[] V_C, byte[] I_S, byte
 
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                        [] I_C);
 
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                /// <exception cref="System.Exception"></exception>
 
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                public abstract bool Next(Buffer buf);
 
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                public abstract string GetKeyType();
 
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                public abstract int GetState();
 
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                protected internal static string[] Guess(byte[] I_S, byte[] I_C)
 
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                {
 
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                        string[] guess = new string[PROPOSAL_MAX];
 
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                        Buffer sb = new Buffer(I_S);
 
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                        sb.SetOffSet(17);
 
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                        Buffer cb = new Buffer(I_C);
 
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                        cb.SetOffSet(17);
 
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                        for (int i = 0; i < PROPOSAL_MAX; i++)
 
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                        {
 
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                                byte[] sp = sb.GetString();
 
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                                // server proposal
 
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                                byte[] cp = cb.GetString();
 
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                                // client proposal
 
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                                int j = 0;
 
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                                int k = 0;
 
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                                while (j < cp.Length)
 
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                                {
 
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                                        while (j < cp.Length && cp[j] != ',')
 
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                                        {
 
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                                                j++;
 
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                                        }
 
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                                        if (k == j)
 
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                                        {
 
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                                                return null;
 
132
                                        }
 
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                                        string algorithm = Util.Byte2str(cp, k, j - k);
 
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                                        int l = 0;
 
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                                        int m = 0;
 
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                                        while (l < sp.Length)
 
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                                        {
 
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                                                while (l < sp.Length && sp[l] != ',')
 
139
                                                {
 
140
                                                        l++;
 
141
                                                }
 
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                                                if (m == l)
 
143
                                                {
 
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                                                        return null;
 
145
                                                }
 
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                                                if (algorithm.Equals(Util.Byte2str(sp, m, l - m)))
 
147
                                                {
 
148
                                                        guess[i] = algorithm;
 
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                                                        goto loop_break;
 
150
                                                }
 
151
                                                l++;
 
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                                                m = l;
 
153
                                        }
 
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                                        j++;
 
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                                        k = j;
 
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loop_continue: ;
 
157
                                }
 
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loop_break: ;
 
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                                if (j == 0)
 
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                                {
 
161
                                        guess[i] = string.Empty;
 
162
                                }
 
163
                                else
 
164
                                {
 
165
                                        if (guess[i] == null)
 
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                                        {
 
167
                                                return null;
 
168
                                        }
 
169
                                }
 
170
                        }
 
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                        if (JSch.GetLogger().IsEnabled(Logger.INFO))
 
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                        {
 
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                                JSch.GetLogger().Log(Logger.INFO, "kex: server->client" + " " + guess[PROPOSAL_ENC_ALGS_STOC
 
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                                        ] + " " + guess[PROPOSAL_MAC_ALGS_STOC] + " " + guess[PROPOSAL_COMP_ALGS_STOC]);
 
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                                JSch.GetLogger().Log(Logger.INFO, "kex: client->server" + " " + guess[PROPOSAL_ENC_ALGS_CTOS
 
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                                        ] + " " + guess[PROPOSAL_MAC_ALGS_CTOS] + " " + guess[PROPOSAL_COMP_ALGS_CTOS]);
 
177
                        }
 
178
                        //    for(int i=0; i<PROPOSAL_MAX; i++){
 
179
                        //      System.err.println("guess: ["+guess[i]+"]");
 
180
                        //    }
 
181
                        return guess;
 
182
                }
 
183
 
 
184
                public virtual string GetFingerPrint()
 
185
                {
 
186
                        HASH hash = null;
 
187
                        try
 
188
                        {
 
189
                                Type c = Sharpen.Runtime.GetType(session.GetConfig("md5"));
 
190
                                hash = (HASH)(System.Activator.CreateInstance(c));
 
191
                        }
 
192
                        catch (Exception e)
 
193
                        {
 
194
                                System.Console.Error.WriteLine("getFingerPrint: " + e);
 
195
                        }
 
196
                        return Util.GetFingerPrint(hash, GetHostKey());
 
197
                }
 
198
 
 
199
                internal virtual byte[] GetK()
 
200
                {
 
201
                        return K;
 
202
                }
 
203
 
 
204
                internal virtual byte[] GetH()
 
205
                {
 
206
                        return H;
 
207
                }
 
208
 
 
209
                internal virtual HASH GetHash()
 
210
                {
 
211
                        return sha;
 
212
                }
 
213
 
 
214
                internal virtual byte[] GetHostKey()
 
215
                {
 
216
                        return K_S;
 
217
                }
 
218
        }
 
219
}