public override bool next(LibSterileSSH.SecureShell.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 = StringAux.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();
ISignatureRSA sig = null;
try {
Type t = Type.GetType(session.getConfig("signature.rsa"));
sig = (ISignatureRSA)(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();
ISignatureDSA sig = null;
try {
Type t = Type.GetType(session.getConfig("signature.dss"));
sig = (ISignatureDSA)(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(LibSterileSSH.SecureShell.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 = StringAux.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();
ISignatureRSA sig = null;
try {
Type t = Type.GetType(session.getConfig("signature.rsa"));
sig = (ISignatureRSA)(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();
ISignatureDSA sig = null;
try {
Type t = Type.GetType(session.getConfig("signature.dss"));
sig = (ISignatureDSA)(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);
}