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JSch is a pure Java implementation of SSH2
/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/*
Copyright (c) 2002-2011 ymnk, JCraft,Inc. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
3. The names of the authors may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jcraft.jsch;
public class DHGEX extends KeyExchange{
private static final int SSH_MSG_KEX_DH_GEX_GROUP= 31;
private static final int SSH_MSG_KEX_DH_GEX_INIT= 32;
private static final int SSH_MSG_KEX_DH_GEX_REPLY= 33;
private static final int SSH_MSG_KEX_DH_GEX_REQUEST= 34;
static int min=1024;
// static int min=512;
static int preferred=1024;
static int max=1024;
// static int preferred=1024;
// static int max=2000;
static final int RSA=0;
static final int DSS=1;
private int type=0;
private int state;
// com.jcraft.jsch.DH dh;
DH dh;
byte[] V_S;
byte[] V_C;
byte[] I_S;
byte[] I_C;
private Buffer buf;
private Packet packet;
private byte[] p;
private byte[] g;
private byte[] e;
//private byte[] f;
public void init(Session session,
byte[] V_S, byte[] V_C, byte[] I_S, byte[] I_C) throws Exception{
this.session=session;
this.V_S=V_S;
this.V_C=V_C;
this.I_S=I_S;
this.I_C=I_C;
try{
Class c=Class.forName(session.getConfig("sha-1"));
sha=(HASH)(c.newInstance());
sha.init();
}
catch(Exception e){
System.err.println(e);
}
buf=new Buffer();
packet=new Packet(buf);
try{
Class c=Class.forName(session.getConfig("dh"));
dh=(com.jcraft.jsch.DH)(c.newInstance());
dh.init();
}
catch(Exception e){
// System.err.println(e);
throw e;
}
packet.reset();
buf.putByte((byte)SSH_MSG_KEX_DH_GEX_REQUEST);
buf.putInt(min);
buf.putInt(preferred);
buf.putInt(max);
session.write(packet);
if(JSch.getLogger().isEnabled(Logger.INFO)){
JSch.getLogger().log(Logger.INFO,
"SSH_MSG_KEX_DH_GEX_REQUEST("+min+"<"+preferred+"<"+max+") sent");
JSch.getLogger().log(Logger.INFO,
"expecting SSH_MSG_KEX_DH_GEX_GROUP");
}
state=SSH_MSG_KEX_DH_GEX_GROUP;
}
public boolean next(Buffer _buf) throws Exception{
int i,j;
switch(state){
case SSH_MSG_KEX_DH_GEX_GROUP:
// byte SSH_MSG_KEX_DH_GEX_GROUP(31)
// mpint p, safe prime
// mpint g, generator for subgroup in GF (p)
_buf.getInt();
_buf.getByte();
j=_buf.getByte();
if(j!=SSH_MSG_KEX_DH_GEX_GROUP){
System.err.println("type: must be SSH_MSG_KEX_DH_GEX_GROUP "+j);
return false;
}
p=_buf.getMPInt();
g=_buf.getMPInt();
/*
for(int iii=0; iii "); dump(H, 0, H.length);
i=0;
j=0;
j=((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
String alg=Util.byte2str(K_S, i, j);
i+=j;
boolean result=false;
if(alg.equals("ssh-rsa")){
byte[] tmp;
byte[] ee;
byte[] n;
type=RSA;
j=((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; System.arraycopy(K_S, i, tmp, 0, j); i+=j;
ee=tmp;
j=((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; System.arraycopy(K_S, i, tmp, 0, j); i+=j;
n=tmp;
// SignatureRSA sig=new SignatureRSA();
// sig.init();
SignatureRSA sig=null;
try{
Class c=Class.forName(session.getConfig("signature.rsa"));
sig=(SignatureRSA)(c.newInstance());
sig.init();
}
catch(Exception e){
System.err.println(e);
}
sig.setPubKey(ee, n);
sig.update(H);
result=sig.verify(sig_of_H);
if(JSch.getLogger().isEnabled(Logger.INFO)){
JSch.getLogger().log(Logger.INFO,
"ssh_rsa_verify: signature "+result);
}
}
else if(alg.equals("ssh-dss")){
byte[] q=null;
byte[] tmp;
type=DSS;
j=((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; System.arraycopy(K_S, i, tmp, 0, j); i+=j;
p=tmp;
j=((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; System.arraycopy(K_S, i, tmp, 0, j); i+=j;
q=tmp;
j=((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; System.arraycopy(K_S, i, tmp, 0, j); i+=j;
g=tmp;
j=((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; System.arraycopy(K_S, i, tmp, 0, j); i+=j;
f=tmp;
// SignatureDSA sig=new SignatureDSA();
// sig.init();
SignatureDSA sig=null;
try{
Class c=Class.forName(session.getConfig("signature.dss"));
sig=(SignatureDSA)(c.newInstance());
sig.init();
}
catch(Exception e){
System.err.println(e);
}
sig.setPubKey(f, p, q, g);
sig.update(H);
result=sig.verify(sig_of_H);
if(JSch.getLogger().isEnabled(Logger.INFO)){
JSch.getLogger().log(Logger.INFO,
"ssh_dss_verify: signature "+result);
}
}
else{
System.err.println("unknown alg");
}
state=STATE_END;
return result;
}
return false;
}
public String getKeyType(){
if(type==DSS) return "DSA";
return "RSA";
}
public int getState(){return state; }
}