mirror of
https://github.com/clearml/dropbear
synced 2025-01-31 10:57:01 +00:00
92 lines
2.6 KiB
C
92 lines
2.6 KiB
C
/*
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* Dropbear - a SSH2 server
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*
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* Copyright (c) 2002,2003 Matt Johnston
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE. */
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#include "includes.h"
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#include "session.h"
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#include "dbutil.h"
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#include "algo.h"
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#include "buffer.h"
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#include "session.h"
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#include "kex.h"
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#include "ssh.h"
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#include "packet.h"
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#include "bignum.h"
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#include "random.h"
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#include "runopts.h"
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void send_msg_kexdh_init() {
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cli_ses.dh_e = (mp_int*)m_malloc(sizeof(mp_int));
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cli_ses.dh_x = (mp_int*)m_malloc(sizeof(mp_int));
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m_mp_init_multi(cli_ses.dh_e, cli_ses.dh_x);
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gen_kexdh_vals(cli_ses.dh_e, cli_ses.dh_x);
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CHECKCLEARTOWRITE();
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buf_putbyte(ses.writepayload, SSH_MSG_KEXDH_INIT);
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buf_putmpint(ses.writepayload, cli_ses.dh_e);
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encrypt_packet();
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ses.requirenext = SSH_MSG_KEXDH_REPLY;
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}
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/* Handle a diffie-hellman key exchange reply. */
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void recv_msg_kexdh_reply() {
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mp_int dh_f;
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sign_key *hostkey = NULL;
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int type;
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type = ses.newkeys->algo_hostkey;
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hostkey = new_sign_key();
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if (buf_get_pub_key(ses.payload, hostkey, &type) != DROPBEAR_SUCCESS) {
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dropbear_exit("Bad KEX packet");
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}
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m_mp_init(&dh_f);
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if (buf_getmpint(ses.payload, &dh_f) != DROPBEAR_SUCCESS) {
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dropbear_exit("Bad KEX packet");
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}
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kexdh_comb_key(cli_ses.dh_e, cli_ses.dh_x, &dh_f, hostkey);
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mp_clear(&dh_f);
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if (buf_verify(ses.payload, hostkey, ses.hash, SHA1_HASH_SIZE)
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!= DROPBEAR_SUCCESS) {
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dropbear_exit("Bad hostkey signature");
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}
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/* XXX TODO */
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dropbear_log(LOG_WARNING,"Not checking hostkey fingerprint for the moment");
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sign_key_free(hostkey);
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hostkey = NULL;
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send_msg_newkeys();
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ses.requirenext = SSH_MSG_NEWKEYS;
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TRACE(("leave recv_msg_kexdh_init"));
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}
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