Joshua Wise's Git repositories - dumload.git/blame - src/com/jcraft/jsch/KeyExchange.java

Commit	Line	Data
0763e16d JW	1	/* --mode:java; c-basic-offset:2; indent-tabs-mode:nil -- */
	2	/*
	3	Copyright (c) 2002-2010 ymnk, JCraft,Inc. All rights reserved.
	4
	5	Redistribution and use in source and binary forms, with or without
	6	modification, are permitted provided that the following conditions are met:
	7
	8	1. Redistributions of source code must retain the above copyright notice,
	9	this list of conditions and the following disclaimer.
	10
	11	2. Redistributions in binary form must reproduce the above copyright
	12	notice, this list of conditions and the following disclaimer in
	13	the documentation and/or other materials provided with the distribution.
	14
	15	3. The names of the authors may not be used to endorse or promote products
	16	derived from this software without specific prior written permission.
	17
	18	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
	19	INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
	20	FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
	21	INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
	22	INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	23	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
	24	OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	25	LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	26	NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
	27	EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	28	*/
	29
	30	package com.jcraft.jsch;
	31
	32	public abstract class KeyExchange{
	33
	34	static final int PROPOSAL_KEX_ALGS=0;
	35	static final int PROPOSAL_SERVER_HOST_KEY_ALGS=1;
	36	static final int PROPOSAL_ENC_ALGS_CTOS=2;
	37	static final int PROPOSAL_ENC_ALGS_STOC=3;
	38	static final int PROPOSAL_MAC_ALGS_CTOS=4;
	39	static final int PROPOSAL_MAC_ALGS_STOC=5;
	40	static final int PROPOSAL_COMP_ALGS_CTOS=6;
	41	static final int PROPOSAL_COMP_ALGS_STOC=7;
	42	static final int PROPOSAL_LANG_CTOS=8;
	43	static final int PROPOSAL_LANG_STOC=9;
	44	static final int PROPOSAL_MAX=10;
	45
	46	//static String kex_algs="diffie-hellman-group-exchange-sha1"+
	47	// ",diffie-hellman-group1-sha1";
	48
	49	//static String kex="diffie-hellman-group-exchange-sha1";
	50	static String kex="diffie-hellman-group1-sha1";
	51	static String server_host_key="ssh-rsa,ssh-dss";
	52	static String enc_c2s="blowfish-cbc";
	53	static String enc_s2c="blowfish-cbc";
	54	static String mac_c2s="hmac-md5"; // hmac-md5,hmac-sha1,hmac-ripemd160,
	55	// hmac-sha1-96,hmac-md5-96
	56	static String mac_s2c="hmac-md5";
	57	//static String comp_c2s="none"; // zlib
	58	//static String comp_s2c="none";
	59	static String lang_c2s="";
	60	static String lang_s2c="";
	61
	62	public static final int STATE_END=0;
	63
	64	protected Session session=null;
65	protected HASH sha=null;
66	protected byte[] K=null;
67	protected byte[] H=null;
68	protected byte[] K_S=null;
69
70	public abstract void init(Session session,
71	byte[] V_S, byte[] V_C, byte[] I_S, byte[] I_C) throws Exception;
72	public abstract boolean next(Buffer buf) throws Exception;
73	public abstract String getKeyType();
74	public abstract int getState();
75
76	/*
77	void dump(byte[] foo){
78	for(int i=0; i<foo.length; i++){
79	if((foo[i]&0xf0)==0)System.err.print("0");
80	System.err.print(Integer.toHexString(foo[i]&0xff));
81	if(i%16==15){System.err.println(""); continue;}
82	if(i%2==1)System.err.print(" ");
83	}
84	}
85	*/
86
87	protected static String[] guess(byte[]I_S, byte[]I_C){
88	String[] guess=new String[PROPOSAL_MAX];
89	Buffer sb=new Buffer(I_S); sb.setOffSet(17);
90	Buffer cb=new Buffer(I_C); cb.setOffSet(17);
91
92	for(int i=0; i<PROPOSAL_MAX; i++){
93	byte[] sp=sb.getString(); // server proposal
94	byte[] cp=cb.getString(); // client proposal
95	int j=0;
96	int k=0;
97
98	loop:
99	while(j<cp.length){
100	while(j<cp.length && cp[j]!=',')j++;
101	if(k==j) return null;
102	String algorithm=Util.byte2str(cp, k, j-k);
103	int l=0;
104	int m=0;
105	while(l<sp.length){
106	while(l<sp.length && sp[l]!=',')l++;
107	if(m==l) return null;
108	if(algorithm.equals(Util.byte2str(sp, m, l-m))){
109	guess[i]=algorithm;
110	break loop;
111	}
112	l++;
113	m=l;
114	}
115	j++;
116	k=j;
117	}
118	if(j==0){
119	guess[i]="";
120	}
121	else if(guess[i]==null){
122	return null;
123	}
124	}
125
126	if(JSch.getLogger().isEnabled(Logger.INFO)){
127	JSch.getLogger().log(Logger.INFO,
128	"kex: server->client"+
129	" "+guess[PROPOSAL_ENC_ALGS_STOC]+
130	" "+guess[PROPOSAL_MAC_ALGS_STOC]+
131	" "+guess[PROPOSAL_COMP_ALGS_STOC]);
132	JSch.getLogger().log(Logger.INFO,
133	"kex: client->server"+
134	" "+guess[PROPOSAL_ENC_ALGS_CTOS]+
135	" "+guess[PROPOSAL_MAC_ALGS_CTOS]+
136	" "+guess[PROPOSAL_COMP_ALGS_CTOS]);
137	}
138
139	// for(int i=0; i<PROPOSAL_MAX; i++){
140	// System.err.println("guess: ["+guess[i]+"]");
141	// }
142
143	return guess;
144	}
145
146	public String getFingerPrint(){
147	HASH hash=null;
148	try{
149	Class c=Class.forName(session.getConfig("md5"));
150	hash=(HASH)(c.newInstance());
151	}
152	catch(Exception e){ System.err.println("getFingerPrint: "+e); }
153	return Util.getFingerPrint(hash, getHostKey());
154	}
155	byte[] getK(){ return K; }
156	byte[] getH(){ return H; }
157	HASH getHash(){ return sha; }
158	byte[] getHostKey(){ return K_S; }
159	}