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/***************************************************************************
* fqterm, a terminal emulator for both BBS and *nix. *
* Copyright (C) 2008 fqterm development group. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
#ifndef FQTERM_SSH2_KEX_H
#define FQTERM_SSH2_KEX_H
#include <openssl/sha.h>
#include "fqterm_ssh_kex.h"
#include "ssh_diffie-hellman.h"
namespace FQTerm {
class FQTermSSHPacketReceiver;
class FQTermSSHPacketSender;
class FQTermSSH2Kex: public FQTermSSHKex {
Q_OBJECT;
private:
enum FQTermSSH2KexState {
BEFORE_KEXINIT, WAIT_REPLY, SESSIONKEY_SENT, KEYEX_OK
} kex_state_;
/*
string V_C, the client's identification string (CR and LF
excluded)
string V_S, the server's identification string (CR and LF
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
*/
int I_C_len_;
char *I_C_;
int I_S_len_;
char *I_S_;
int K_S_len_;
char *K_S_;
SSH_DH *dh;
BIGNUM *bn_x_;
BIGNUM *bn_e_;
BN_CTX *ctx_;
BIGNUM *bn_K_;
BIGNUM *bn_f_;
unsigned char H_[SHA512_DIGEST_LENGTH];
unsigned char *session_id_;
bool is_first_kex_;
u_char cookie_[16];
int server_flag_, ciphers_, auth_;
// u_char session_id_[16];
u_char session_key_[32];
bool negotiateAlgorithms();
void exchangeKey();
bool verifyKey();
void sendNewKeys();
bool changeKeyAlg();
unsigned char *computeKey(int len, char flag);
public:
FQTermSSH2Kex(const char *V_C, const char *V_S);
~FQTermSSH2Kex();
virtual void initKex(FQTermSSHPacketReceiver *packetReceiver,
FQTermSSHPacketSender *outputSender);
void hostKeyHash(unsigned char *md)
{
SHA256((const unsigned char*)K_S_, K_S_len_, md);
}
public slots:
void handlePacket(int type);
};
} // namespace FQTerm
#endif //FQTERM_SSH2_KEX_H
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