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/*
* Dropbear - a SSH2 server
*
* Copyright (c) 2002,2003 Matt Johnston
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE. */
#include "includes.h"
#include "session.h"
#include "dbutil.h"
#include "algo.h"
#include "buffer.h"
#include "session.h"
#include "kex.h"
#include "ssh.h"
#include "packet.h"
#include "bignum.h"
#include "random.h"
#include "runopts.h"
#include "signkey.h"
void send_msg_kexdh_init() {
cli_ses.dh_e = (mp_int*)m_malloc(sizeof(mp_int));
cli_ses.dh_x = (mp_int*)m_malloc(sizeof(mp_int));
m_mp_init_multi(cli_ses.dh_e, cli_ses.dh_x, NULL);
gen_kexdh_vals(cli_ses.dh_e, cli_ses.dh_x);
CHECKCLEARTOWRITE();
buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_INIT);
buf_putmpint(ses.writepayload, cli_ses.dh_e);
encrypt_packet();
ses.requirenext = SSH_MSG_KEXDH_REPLY;
}
/* Handle a diffie-hellman key exchange reply. */
void recv_msg_kexdh_reply() {
mp_int dh_f;
sign_key *hostkey = NULL;
int type, keylen;
TRACE(("enter recv_msg_kexdh_reply"));
type = ses.newkeys->algo_hostkey;
TRACE(("type is %d", type));
hostkey = new_sign_key();
keylen = buf_getint(ses.payload);
if (buf_get_pub_key(ses.payload, hostkey, &type) != DROPBEAR_SUCCESS) {
TRACE(("failed getting pubkey"));
dropbear_exit("Bad KEX packet");
}
m_mp_init(&dh_f);
if (buf_getmpint(ses.payload, &dh_f) != DROPBEAR_SUCCESS) {
TRACE(("failed getting mpint"));
dropbear_exit("Bad KEX packet");
}
kexdh_comb_key(cli_ses.dh_e, cli_ses.dh_x, &dh_f, hostkey);
mp_clear(&dh_f);
if (buf_verify(ses.payload, hostkey, ses.hash, SHA1_HASH_SIZE)
!= DROPBEAR_SUCCESS) {
dropbear_exit("Bad hostkey signature");
}
/* XXX TODO */
dropbear_log(LOG_WARNING,"Not checking hostkey fingerprint for the moment");
sign_key_free(hostkey);
hostkey = NULL;
send_msg_newkeys();
ses.requirenext = SSH_MSG_NEWKEYS;
TRACE(("leave recv_msg_kexdh_init"));
}
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