public override bool next(Buffer _buf)
{
int i,j;
bool result = false;
switch(state)
{
case SSH_MSG_KEXDH_REPLY:
// The server responds with:
// byte SSH_MSG_KEXDH_REPLY(31)
// string server public host key and certificates (K_S)
// mpint f
// string signature of H
j=_buf.getInt();
j=_buf.getByte();
j=_buf.getByte();
if(j!=31)
{
Console.WriteLine("type: must be 31 "+j);
result = false;
break;
}
K_S=_buf.getString();
// K_S is server_key_blob, which includes ....
// string ssh-dss
// impint p of dsa
// impint q of dsa
// impint g of dsa
// impint pub_key of dsa
//System.out.print("K_S: "); //dump(K_S, 0, K_S.length);
byte[] f=_buf.getMPInt();
byte[] sig_of_H=_buf.getString();
/*
for(int ii=0; ii<sig_of_H.length;ii++){
System.out.print(Integer.toHexString(sig_of_H[ii]&0xff));
System.out.print(": ");
}
Console.WriteLine("");
*/
dh.setF(f);
K=dh.getK();
//The hash H is computed as the HASH hash of the concatenation of the
//following:
// string V_C, the client's version string (CR and NL excluded)
// string V_S, the server's version string (CR and NL excluded)
// string I_C, the payload of the client's SSH_MSG_KEXINIT
// string I_S, the payload of the server's SSH_MSG_KEXINIT
// string K_S, the host key
// mpint e, exchange value sent by the client
// mpint f, exchange value sent by the server
// mpint K, the shared secret
// This value is called the exchange hash, and it is used to authenti-
// cate the key exchange.
buf.reset();
buf.putString(V_C); buf.putString(V_S);
buf.putString(I_C); buf.putString(I_S);
buf.putString(K_S);
buf.putMPInt(e); buf.putMPInt(f);
buf.putMPInt(K);
byte[] foo=new byte[buf.getLength()];
buf.getByte(foo);
sha.update(foo, 0, foo.Length);
H=sha.digest();
//System.out.print("H -> "); //dump(H, 0, H.length);
i=0;
j=0;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
String alg=Util.getString(K_S, i, j);
i+=j;
result=false;
if(alg.Equals("ssh-rsa"))
{
byte[] tmp;
byte[] ee;
byte[] n;
type=RSA;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
ee=tmp;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
n=tmp;
// SignatureRSA sig=new SignatureRSA();
// sig.init();
SignatureRSA sig=null;
try
{
Type t=Type.GetType(session.getConfig("signature.rsa"));
sig=(SignatureRSA)(Activator.CreateInstance(t));
sig.init();
}
catch(Exception eee)
{
Console.WriteLine(eee);
}
sig.setPubKey(ee, n);
sig.update(H);
result=sig.verify(sig_of_H);
//MainClass.dump(ee, n, sig_of_H, H);
}
else if(alg.Equals("ssh-dss"))
{
byte[] q=null;
byte[] tmp;
byte[] p;
byte[] g;
type=DSS;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
p=tmp;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
q=tmp;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
g=tmp;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
f=tmp;
// SignatureDSA sig=new SignatureDSA();
// sig.init();
SignatureDSA sig=null;
try
{
Type t=Type.GetType(session.getConfig("signature.dss"));
sig=(SignatureDSA)(Activator.CreateInstance(t));
sig.init();
}
catch(Exception ee)
{
Console.WriteLine(ee);
}
sig.setPubKey(f, p, q, g);
sig.update(H);
result=sig.verify(sig_of_H);
}
else
{
Console.WriteLine("unknow alg");
}
state=STATE_END;
break;
}
return result;
}
public override bool next(Buffer _buf)
{
int i,j;
bool result=false;
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!=31)
{
Console.WriteLine("type: must be 31 "+j);
result = false;
}
p=_buf.getMPInt();
g=_buf.getMPInt();
/*
for(int iii=0; iii<p.length; iii++){
System.out.println("0x"+Integer.toHexString(p[iii]&0xff)+",");
}
System.out.println("");
for(int iii=0; iii<g.length; iii++){
System.out.println("0x"+Integer.toHexString(g[iii]&0xff)+",");
}
*/
dh.setP(p);
dh.setG(g);
// The client responds with:
// byte SSH_MSG_KEX_DH_GEX_INIT(32)
// mpint e <- g^x mod p
// x is a random number (1 < x < (p-1)/2)
e=dh.getE();
packet.reset();
buf.putByte((byte)0x20);
buf.putMPInt(e);
session.write(packet);
state=SSH_MSG_KEX_DH_GEX_REPLY;
result = true;
break;
case SSH_MSG_KEX_DH_GEX_REPLY:
// The server responds with:
// byte SSH_MSG_KEX_DH_GEX_REPLY(33)
// string server public host key and certificates (K_S)
// mpint f
// string signature of H
j=_buf.getInt();
j=_buf.getByte();
j=_buf.getByte();
if(j!=33)
{
Console.WriteLine("type: must be 33 "+j);
result = false;
}
K_S=_buf.getString();
// K_S is server_key_blob, which includes ....
// string ssh-dss
// impint p of dsa
// impint q of dsa
// impint g of dsa
// impint pub_key of dsa
//System.out.print("K_S: "); dump(K_S, 0, K_S.length);
byte[] f=_buf.getMPInt();
byte[] sig_of_H=_buf.getString();
dh.setF(f);
K=dh.getK();
//The hash H is computed as the HASH hash of the concatenation of the
//following:
// string V_C, the client's version string (CR and NL excluded)
// string V_S, the server's version string (CR and NL excluded)
// string I_C, the payload of the client's SSH_MSG_KEXINIT
// string I_S, the payload of the server's SSH_MSG_KEXINIT
// string K_S, the host key
// uint32 min, minimal size in bits of an acceptable group
// uint32 n, preferred size in bits of the group the server should send
// uint32 max, maximal size in bits of an acceptable group
// mpint p, safe prime
// mpint g, generator for subgroup
// mpint e, exchange value sent by the client
// mpint f, exchange value sent by the server
// mpint K, the shared secret
// This value is called the exchange hash, and it is used to authenti-
// cate the key exchange.
buf.reset();
buf.putString(V_C); buf.putString(V_S);
buf.putString(I_C); buf.putString(I_S);
buf.putString(K_S);
buf.putInt(min); buf.putInt(preferred); buf.putInt(max);
buf.putMPInt(p); buf.putMPInt(g); buf.putMPInt(e); buf.putMPInt(f);
buf.putMPInt(K);
byte[] foo=new byte[buf.getLength()];
buf.getByte(foo);
sha.update(foo, 0, foo.Length);
H=sha.digest();
// System.out.print("H -> "); dump(H, 0, H.length);
i=0;
j=0;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
String alg=Util.getString(K_S, i, j);
i+=j;
if(alg.Equals("ssh-rsa"))
{
byte[] tmp;
byte[] ee;
byte[] n;
type=RSA;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
ee=tmp;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
n=tmp;
// SignatureRSA sig=new SignatureRSA();
// sig.init();
SignatureRSA sig=null;
try
{
Type t=Type.GetType(session.getConfig("signature.rsa"));
sig=(SignatureRSA)(Activator.CreateInstance(t));
sig.init();
}
catch(Exception eee)
{
Console.WriteLine(eee);
}
sig.setPubKey(ee, n);
sig.update(H);
result=sig.verify(sig_of_H);
}
else if(alg.Equals("ssh-dss"))
{
byte[] q=null;
byte[] tmp;
type=DSS;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
p=tmp;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
q=tmp;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
g=tmp;
j=(int)((K_S[i++]<<24)&0xff000000)|((K_S[i++]<<16)&0x00ff0000)|
((K_S[i++]<<8)&0x0000ff00)|((K_S[i++])&0x000000ff);
tmp=new byte[j]; Array.Copy(K_S, i, tmp, 0, j); i+=j;
f=tmp;
// SignatureDSA sig=new SignatureDSA();
// sig.init();
SignatureDSA sig=null;
try
{
Type t=Type.GetType(session.getConfig("signature.dss"));
sig=(SignatureDSA)(Activator.CreateInstance(t));
sig.init();
}
catch(Exception ee)
{
Console.WriteLine(ee);
}
sig.setPubKey(f, p, q, g);
sig.update(H);
result=sig.verify(sig_of_H);
}
else
{
Console.WriteLine("unknow alg");
}
state=STATE_END;
break;
}
return result;
}