1002 lines
22 KiB
C
1002 lines
22 KiB
C
/* $NetBSD: encrypt.c,v 1.14 2007/01/17 23:24:22 hubertf Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if 0
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static char sccsid[] = "@(#)encrypt.c 8.2 (Berkeley) 5/30/95";
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#else
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__RCSID("$NetBSD: encrypt.c,v 1.14 2007/01/17 23:24:22 hubertf Exp $");
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#endif /* not lint */
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/*
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* Copyright (C) 1990 by the Massachusetts Institute of Technology
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*
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* Export of this software from the United States of America is assumed
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* to require a specific license from the United States Government.
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* It is the responsibility of any person or organization contemplating
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* export to obtain such a license before exporting.
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*
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* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
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* distribute this software and its documentation for any purpose and
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* without fee is hereby granted, provided that the above copyright
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* notice appear in all copies and that both that copyright notice and
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* this permission notice appear in supporting documentation, and that
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* the name of M.I.T. not be used in advertising or publicity pertaining
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* to distribution of the software without specific, written prior
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* permission. M.I.T. makes no representations about the suitability of
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* this software for any purpose. It is provided "as is" without express
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* or implied warranty.
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*/
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#ifdef ENCRYPTION
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#include <stdio.h>
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#define ENCRYPT_NAMES
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#include <arpa/telnet.h>
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#include "encrypt.h"
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#include "misc.h"
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#include <stdlib.h>
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#ifdef NO_STRING_H
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#include <strings.h>
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#else
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#include <string.h>
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#endif
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/*
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* These functions pointers point to the current routines
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* for encrypting and decrypting data.
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*/
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void (*encrypt_output)(unsigned char *, int);
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int (*decrypt_input)(int);
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int encrypt_debug_mode = 0;
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static int decrypt_mode = 0;
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static int encrypt_mode = 0;
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static int encrypt_verbose = 0;
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static int autoencrypt = 0;
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static int autodecrypt = 0;
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static int havesessionkey = 0;
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static int Server = 0;
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static const char *Name = "Noname";
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#define typemask(x) ((x) > 0 ? 1 << ((x)-1) : 0)
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static long i_support_encrypt = typemask(ENCTYPE_DES_CFB64)
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| typemask(ENCTYPE_DES_OFB64);
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static long i_support_decrypt = typemask(ENCTYPE_DES_CFB64)
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| typemask(ENCTYPE_DES_OFB64);
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static long i_wont_support_encrypt = 0;
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static long i_wont_support_decrypt = 0;
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#define I_SUPPORT_ENCRYPT (i_support_encrypt & ~i_wont_support_encrypt)
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#define I_SUPPORT_DECRYPT (i_support_decrypt & ~i_wont_support_decrypt)
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static long remote_supports_encrypt = 0;
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static long remote_supports_decrypt = 0;
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static Encryptions encryptions[] = {
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#ifdef DES_ENCRYPTION
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{ "DES_CFB64", ENCTYPE_DES_CFB64,
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cfb64_encrypt,
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cfb64_decrypt,
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cfb64_init,
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cfb64_start,
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cfb64_is,
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cfb64_reply,
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cfb64_session,
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cfb64_keyid,
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cfb64_printsub },
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{ "DES_OFB64", ENCTYPE_DES_OFB64,
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ofb64_encrypt,
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ofb64_decrypt,
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ofb64_init,
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ofb64_start,
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ofb64_is,
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ofb64_reply,
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ofb64_session,
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ofb64_keyid,
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ofb64_printsub },
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#endif /* DES_ENCRYPTION */
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{ 0, },
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};
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static unsigned char str_send[64] = { IAC, SB, TELOPT_ENCRYPT,
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ENCRYPT_SUPPORT };
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static unsigned char str_suplen = 0;
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static unsigned char str_start[72] = { IAC, SB, TELOPT_ENCRYPT };
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static unsigned char str_end[] = { IAC, SB, TELOPT_ENCRYPT, 0, IAC, SE };
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Encryptions *
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findencryption(type)
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int type;
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{
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Encryptions *ep = encryptions;
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if (!(I_SUPPORT_ENCRYPT & remote_supports_decrypt & typemask(type)))
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return(0);
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while (ep->type && ep->type != type)
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++ep;
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return(ep->type ? ep : 0);
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}
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Encryptions *
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finddecryption(type)
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int type;
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{
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Encryptions *ep = encryptions;
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if (!(I_SUPPORT_DECRYPT & remote_supports_encrypt & typemask(type)))
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return(0);
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while (ep->type && ep->type != type)
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++ep;
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return(ep->type ? ep : 0);
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}
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#define MAXKEYLEN 64
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static struct key_info {
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unsigned char keyid[MAXKEYLEN];
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int keylen;
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int dir;
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int *modep;
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Encryptions *(*getcrypt)(int);
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} ki[2] = {
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{ { 0 }, 0, DIR_ENCRYPT, &encrypt_mode, findencryption },
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{ { 0 }, 0, DIR_DECRYPT, &decrypt_mode, finddecryption },
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};
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void
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encrypt_init(name, server)
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const char *name;
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int server;
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{
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Encryptions *ep = encryptions;
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Name = name;
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Server = server;
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i_support_encrypt = i_support_decrypt = 0;
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remote_supports_encrypt = remote_supports_decrypt = 0;
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encrypt_mode = 0;
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decrypt_mode = 0;
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encrypt_output = 0;
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decrypt_input = 0;
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#ifdef notdef
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encrypt_verbose = !server;
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#endif
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str_suplen = 4;
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while (ep->type) {
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if (encrypt_debug_mode)
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printf(">>>%s: I will support %s\r\n",
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Name, ENCTYPE_NAME(ep->type));
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i_support_encrypt |= typemask(ep->type);
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i_support_decrypt |= typemask(ep->type);
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if ((i_wont_support_decrypt & typemask(ep->type)) == 0)
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if ((str_send[str_suplen++] = ep->type) == IAC)
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str_send[str_suplen++] = IAC;
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if (ep->init)
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(*ep->init)(Server);
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++ep;
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}
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str_send[str_suplen++] = IAC;
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str_send[str_suplen++] = SE;
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}
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void
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encrypt_list_types()
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{
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Encryptions *ep = encryptions;
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printf("Valid encryption types:\n");
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while (ep->type) {
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printf("\t%s (%d)\r\n", ENCTYPE_NAME(ep->type), ep->type);
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++ep;
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}
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}
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int
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EncryptEnable(type, mode)
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char *type, *mode;
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{
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if (isprefix(type, "help") || isprefix(type, "?")) {
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printf("Usage: encrypt enable <type> [input|output]\n");
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encrypt_list_types();
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return(0);
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}
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if (EncryptType(type, mode))
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return(EncryptStart(mode));
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return(0);
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}
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int
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EncryptDisable(type, mode)
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char *type, *mode;
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{
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register Encryptions *ep;
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int ret = 0;
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if (isprefix(type, "help") || isprefix(type, "?")) {
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printf("Usage: encrypt disable <type> [input|output]\n");
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encrypt_list_types();
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} else if ((ep = (Encryptions *)genget(type, (char **)encryptions,
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sizeof(Encryptions))) == 0) {
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printf("%s: invalid encryption type\n", type);
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} else if (Ambiguous(ep)) {
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printf("Ambiguous type '%s'\n", type);
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} else {
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if ((mode == 0) || (isprefix(mode, "input") ? 1 : 0)) {
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if (decrypt_mode == ep->type)
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EncryptStopInput();
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i_wont_support_decrypt |= typemask(ep->type);
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ret = 1;
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}
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if ((mode == 0) || (isprefix(mode, "output"))) {
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if (encrypt_mode == ep->type)
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EncryptStopOutput();
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i_wont_support_encrypt |= typemask(ep->type);
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ret = 1;
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}
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if (ret == 0)
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printf("%s: invalid encryption mode\n", mode);
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}
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return(ret);
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}
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int
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EncryptType(type, mode)
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char *type;
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char *mode;
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{
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register Encryptions *ep;
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int ret = 0;
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if (isprefix(type, "help") || isprefix(type, "?")) {
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printf("Usage: encrypt type <type> [input|output]\n");
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encrypt_list_types();
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} else if ((ep = (Encryptions *)genget(type, (char **)encryptions,
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sizeof(Encryptions))) == 0) {
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printf("%s: invalid encryption type\n", type);
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} else if (Ambiguous(ep)) {
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printf("Ambiguous type '%s'\n", type);
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} else {
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if ((mode == 0) || isprefix(mode, "input")) {
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decrypt_mode = ep->type;
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i_wont_support_decrypt &= ~typemask(ep->type);
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ret = 1;
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}
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if ((mode == 0) || isprefix(mode, "output")) {
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encrypt_mode = ep->type;
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i_wont_support_encrypt &= ~typemask(ep->type);
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ret = 1;
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}
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if (ret == 0)
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printf("%s: invalid encryption mode\n", mode);
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}
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return(ret);
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}
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int
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EncryptStart(mode)
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char *mode;
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{
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register int ret = 0;
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if (mode) {
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if (isprefix(mode, "input"))
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return(EncryptStartInput());
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if (isprefix(mode, "output"))
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return(EncryptStartOutput());
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if (isprefix(mode, "help") || isprefix(mode, "?")) {
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printf("Usage: encrypt start [input|output]\n");
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return(0);
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}
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printf("%s: invalid encryption mode 'encrypt start ?' for help\n", mode);
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return(0);
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}
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ret += EncryptStartInput();
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ret += EncryptStartOutput();
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return(ret);
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}
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int
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EncryptStartInput()
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{
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if (decrypt_mode) {
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encrypt_send_request_start();
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return(1);
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}
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printf("No previous decryption mode, decryption not enabled\r\n");
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return(0);
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}
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int
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EncryptStartOutput()
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{
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if (encrypt_mode) {
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encrypt_start_output(encrypt_mode);
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return(1);
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}
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printf("No previous encryption mode, encryption not enabled\r\n");
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return(0);
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}
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int
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EncryptStop(mode)
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char *mode;
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{
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int ret = 0;
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if (mode) {
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if (isprefix(mode, "input"))
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return(EncryptStopInput());
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if (isprefix(mode, "output"))
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return(EncryptStopOutput());
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if (isprefix(mode, "help") || isprefix(mode, "?")) {
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printf("Usage: encrypt stop [input|output]\n");
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return(0);
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}
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printf("%s: invalid encryption mode 'encrypt stop ?' for help\n", mode);
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return(0);
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}
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ret += EncryptStopInput();
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ret += EncryptStopOutput();
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return(ret);
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}
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int
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EncryptStopInput()
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{
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encrypt_send_request_end();
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return(1);
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}
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int
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EncryptStopOutput()
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{
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encrypt_send_end();
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return(1);
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}
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void
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encrypt_display()
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{
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if (encrypt_output)
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printf("Currently encrypting output with %s\r\n",
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ENCTYPE_NAME(encrypt_mode));
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if (decrypt_input)
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printf("Currently decrypting input with %s\r\n",
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ENCTYPE_NAME(decrypt_mode));
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}
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int
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EncryptStatus()
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{
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if (encrypt_output)
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printf("Currently encrypting output with %s\r\n",
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ENCTYPE_NAME(encrypt_mode));
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else if (encrypt_mode) {
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printf("Currently output is clear text.\r\n");
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printf("Last encryption mode was %s\r\n",
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ENCTYPE_NAME(encrypt_mode));
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}
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if (decrypt_input) {
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printf("Currently decrypting input with %s\r\n",
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ENCTYPE_NAME(decrypt_mode));
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} else if (decrypt_mode) {
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printf("Currently input is clear text.\r\n");
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printf("Last decryption mode was %s\r\n",
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ENCTYPE_NAME(decrypt_mode));
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}
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return 1;
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}
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void
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encrypt_send_support()
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{
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if (str_suplen) {
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/*
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* If the user has requested that decryption start
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* immediatly, then send a "REQUEST START" before
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* we negotiate the type.
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*/
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if (!Server && autodecrypt)
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encrypt_send_request_start();
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telnet_net_write(str_send, str_suplen);
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printsub('>', &str_send[2], str_suplen - 2);
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str_suplen = 0;
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}
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}
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int
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EncryptDebug(on)
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int on;
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{
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if (on < 0)
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encrypt_debug_mode ^= 1;
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else
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encrypt_debug_mode = on;
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printf("Encryption debugging %s\r\n",
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encrypt_debug_mode ? "enabled" : "disabled");
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return(1);
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}
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int
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EncryptVerbose(on)
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int on;
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{
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if (on < 0)
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encrypt_verbose ^= 1;
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else
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encrypt_verbose = on;
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printf("Encryption %s verbose\r\n",
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encrypt_verbose ? "is" : "is not");
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return(1);
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}
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int
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EncryptAutoEnc(on)
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int on;
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{
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encrypt_auto(on);
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printf("Automatic encryption of output is %s\r\n",
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autoencrypt ? "enabled" : "disabled");
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return(1);
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}
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int
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EncryptAutoDec(on)
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int on;
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{
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decrypt_auto(on);
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printf("Automatic decryption of input is %s\r\n",
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autodecrypt ? "enabled" : "disabled");
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return(1);
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}
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/*
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* Called when ENCRYPT SUPPORT is received.
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*/
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void
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encrypt_support(typelist, cnt)
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unsigned char *typelist;
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int cnt;
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{
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register int type, use_type = 0;
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Encryptions *ep;
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/*
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* Forget anything the other side has previously told us.
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*/
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remote_supports_decrypt = 0;
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while (cnt-- > 0) {
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type = *typelist++;
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if (encrypt_debug_mode)
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printf(">>>%s: He is supporting %s (%d)\r\n",
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Name,
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ENCTYPE_NAME(type), type);
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if ((type < ENCTYPE_CNT) &&
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(I_SUPPORT_ENCRYPT & typemask(type))) {
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remote_supports_decrypt |= typemask(type);
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if (use_type == 0)
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use_type = type;
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}
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}
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if (use_type) {
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ep = findencryption(use_type);
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if (!ep)
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return;
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type = ep->start ? (*ep->start)(DIR_ENCRYPT, Server) : 0;
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if (encrypt_debug_mode)
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printf(">>>%s: (*ep->start)() returned %d\r\n",
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Name, type);
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if (type < 0)
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return;
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encrypt_mode = use_type;
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if (type == 0)
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encrypt_start_output(use_type);
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}
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}
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void
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encrypt_is(data, cnt)
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unsigned char *data;
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int cnt;
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{
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Encryptions *ep;
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register int type, ret;
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if (--cnt < 0)
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return;
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type = *data++;
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if (type < ENCTYPE_CNT)
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remote_supports_encrypt |= typemask(type);
|
|
if (!(ep = finddecryption(type))) {
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: Can't find type %s (%d) for initial negotiation\r\n",
|
|
Name,
|
|
ENCTYPE_NAME_OK(type)
|
|
? ENCTYPE_NAME(type) : "(unknown)",
|
|
type);
|
|
return;
|
|
}
|
|
if (!ep->is) {
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: No initial negotiation needed for type %s (%d)\r\n",
|
|
Name,
|
|
ENCTYPE_NAME_OK(type)
|
|
? ENCTYPE_NAME(type) : "(unknown)",
|
|
type);
|
|
ret = 0;
|
|
} else {
|
|
ret = (*ep->is)(data, cnt);
|
|
if (encrypt_debug_mode)
|
|
printf("(*ep->is)(%p, %d) returned %s(%d)\n", data, cnt,
|
|
(ret < 0) ? "FAIL " :
|
|
(ret == 0) ? "SUCCESS " : "MORE_TO_DO ", ret);
|
|
}
|
|
if (ret < 0) {
|
|
autodecrypt = 0;
|
|
} else {
|
|
decrypt_mode = type;
|
|
if (ret == 0 && autodecrypt)
|
|
encrypt_send_request_start();
|
|
}
|
|
}
|
|
|
|
void
|
|
encrypt_reply(data, cnt)
|
|
unsigned char *data;
|
|
int cnt;
|
|
{
|
|
Encryptions *ep;
|
|
register int ret, type;
|
|
|
|
if (--cnt < 0)
|
|
return;
|
|
type = *data++;
|
|
if (!(ep = findencryption(type))) {
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: Can't find type %s (%d) for initial negotiation\r\n",
|
|
Name,
|
|
ENCTYPE_NAME_OK(type)
|
|
? ENCTYPE_NAME(type) : "(unknown)",
|
|
type);
|
|
return;
|
|
}
|
|
if (!ep->reply) {
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: No initial negotiation needed for type %s (%d)\r\n",
|
|
Name,
|
|
ENCTYPE_NAME_OK(type)
|
|
? ENCTYPE_NAME(type) : "(unknown)",
|
|
type);
|
|
ret = 0;
|
|
} else {
|
|
ret = (*ep->reply)(data, cnt);
|
|
if (encrypt_debug_mode)
|
|
printf("(*ep->reply)(%p, %d) returned %s(%d)\n",
|
|
data, cnt,
|
|
(ret < 0) ? "FAIL " :
|
|
(ret == 0) ? "SUCCESS " : "MORE_TO_DO ", ret);
|
|
}
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: encrypt_reply returned %d\n", Name, ret);
|
|
if (ret < 0) {
|
|
autoencrypt = 0;
|
|
} else {
|
|
encrypt_mode = type;
|
|
if (ret == 0 && autoencrypt)
|
|
encrypt_start_output(type);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called when a ENCRYPT START command is received.
|
|
*/
|
|
void
|
|
encrypt_start(data, cnt)
|
|
unsigned char *data;
|
|
int cnt;
|
|
{
|
|
Encryptions *ep;
|
|
|
|
if (!decrypt_mode) {
|
|
/*
|
|
* Something is wrong. We should not get a START
|
|
* command without having already picked our
|
|
* decryption scheme. Send a REQUEST-END to
|
|
* attempt to clear the channel...
|
|
*/
|
|
printf("%s: Warning, Cannot decrypt input stream!!!\r\n", Name);
|
|
encrypt_send_request_end();
|
|
return;
|
|
}
|
|
|
|
if ((ep = finddecryption(decrypt_mode)) != NULL) {
|
|
decrypt_input = ep->input;
|
|
if (encrypt_verbose)
|
|
printf("[ Input is now decrypted with type %s ]\r\n",
|
|
ENCTYPE_NAME(decrypt_mode));
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: Start to decrypt input with type %s\r\n",
|
|
Name, ENCTYPE_NAME(decrypt_mode));
|
|
} else {
|
|
printf("%s: Warning, Cannot decrypt type %s (%d)!!!\r\n",
|
|
Name,
|
|
ENCTYPE_NAME_OK(decrypt_mode)
|
|
? ENCTYPE_NAME(decrypt_mode)
|
|
: "(unknown)",
|
|
decrypt_mode);
|
|
encrypt_send_request_end();
|
|
}
|
|
}
|
|
|
|
void
|
|
encrypt_session_key(key, server)
|
|
Session_Key *key;
|
|
int server;
|
|
{
|
|
Encryptions *ep = encryptions;
|
|
|
|
havesessionkey = 1;
|
|
|
|
while (ep->type) {
|
|
if (ep->session)
|
|
(*ep->session)(key, server);
|
|
#ifdef notdef
|
|
if (!encrypt_output && autoencrypt && !server)
|
|
encrypt_start_output(ep->type);
|
|
if (!decrypt_input && autodecrypt && !server)
|
|
encrypt_send_request_start();
|
|
#endif
|
|
++ep;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called when ENCRYPT END is received.
|
|
*/
|
|
void
|
|
encrypt_end()
|
|
{
|
|
decrypt_input = 0;
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: Input is back to clear text\r\n", Name);
|
|
if (encrypt_verbose)
|
|
printf("[ Input is now clear text ]\r\n");
|
|
}
|
|
|
|
/*
|
|
* Called when ENCRYPT REQUEST-END is received.
|
|
*/
|
|
void
|
|
encrypt_request_end()
|
|
{
|
|
encrypt_send_end();
|
|
}
|
|
|
|
/*
|
|
* Called when ENCRYPT REQUEST-START is received. If we receive
|
|
* this before a type is picked, then that indicates that the
|
|
* other side wants us to start encrypting data as soon as we
|
|
* can.
|
|
*/
|
|
void
|
|
encrypt_request_start(data, cnt)
|
|
unsigned char *data;
|
|
int cnt;
|
|
{
|
|
if (encrypt_mode == 0) {
|
|
if (Server)
|
|
autoencrypt = 1;
|
|
return;
|
|
}
|
|
encrypt_start_output(encrypt_mode);
|
|
}
|
|
|
|
static unsigned char str_keyid[(MAXKEYLEN*2)+5] = { IAC, SB, TELOPT_ENCRYPT };
|
|
|
|
void
|
|
encrypt_enc_keyid(keyid, len)
|
|
unsigned char *keyid;
|
|
int len;
|
|
{
|
|
encrypt_keyid(&ki[1], keyid, len);
|
|
}
|
|
|
|
void
|
|
encrypt_dec_keyid(keyid, len)
|
|
unsigned char *keyid;
|
|
int len;
|
|
{
|
|
encrypt_keyid(&ki[0], keyid, len);
|
|
}
|
|
|
|
void
|
|
encrypt_keyid(kp, keyid, len)
|
|
struct key_info *kp;
|
|
unsigned char *keyid;
|
|
int len;
|
|
{
|
|
Encryptions *ep;
|
|
int dir = kp->dir;
|
|
register int ret = 0;
|
|
|
|
if (!(ep = (*kp->getcrypt)(*kp->modep))) {
|
|
if (len == 0)
|
|
return;
|
|
kp->keylen = 0;
|
|
} else if (len == 0) {
|
|
/*
|
|
* Empty option, indicates a failure.
|
|
*/
|
|
if (kp->keylen == 0)
|
|
return;
|
|
kp->keylen = 0;
|
|
if (ep->keyid)
|
|
(void)(*ep->keyid)(dir, kp->keyid, &kp->keylen);
|
|
|
|
} else if ((len != kp->keylen) ||
|
|
(memcmp(keyid, kp->keyid, len) != 0)) {
|
|
/*
|
|
* Length or contents are different
|
|
*/
|
|
kp->keylen = len;
|
|
memmove(kp->keyid, keyid, len);
|
|
if (ep->keyid)
|
|
(void)(*ep->keyid)(dir, kp->keyid, &kp->keylen);
|
|
} else {
|
|
if (ep->keyid)
|
|
ret = (*ep->keyid)(dir, kp->keyid, &kp->keylen);
|
|
if ((ret == 0) && (dir == DIR_ENCRYPT) && autoencrypt)
|
|
encrypt_start_output(*kp->modep);
|
|
return;
|
|
}
|
|
|
|
encrypt_send_keyid(dir, kp->keyid, kp->keylen, 0);
|
|
}
|
|
|
|
void
|
|
encrypt_send_keyid(dir, keyid, keylen, saveit)
|
|
int dir;
|
|
unsigned char *keyid;
|
|
int keylen;
|
|
int saveit;
|
|
{
|
|
unsigned char *strp;
|
|
|
|
str_keyid[3] = (dir == DIR_ENCRYPT)
|
|
? ENCRYPT_ENC_KEYID : ENCRYPT_DEC_KEYID;
|
|
if (saveit) {
|
|
struct key_info *kp = &ki[(dir == DIR_ENCRYPT) ? 0 : 1];
|
|
memmove(kp->keyid, keyid, keylen);
|
|
kp->keylen = keylen;
|
|
}
|
|
|
|
for (strp = &str_keyid[4]; keylen > 0; --keylen) {
|
|
if ((*strp++ = *keyid++) == IAC)
|
|
*strp++ = IAC;
|
|
}
|
|
*strp++ = IAC;
|
|
*strp++ = SE;
|
|
telnet_net_write(str_keyid, strp - str_keyid);
|
|
printsub('>', &str_keyid[2], strp - str_keyid - 2);
|
|
}
|
|
|
|
void
|
|
encrypt_auto(on)
|
|
int on;
|
|
{
|
|
if (on < 0)
|
|
autoencrypt ^= 1;
|
|
else
|
|
autoencrypt = on ? 1 : 0;
|
|
}
|
|
|
|
void
|
|
decrypt_auto(on)
|
|
int on;
|
|
{
|
|
if (on < 0)
|
|
autodecrypt ^= 1;
|
|
else
|
|
autodecrypt = on ? 1 : 0;
|
|
}
|
|
|
|
void
|
|
encrypt_start_output(type)
|
|
int type;
|
|
{
|
|
Encryptions *ep;
|
|
register unsigned char *p;
|
|
register int i;
|
|
|
|
if (!(ep = findencryption(type))) {
|
|
if (encrypt_debug_mode) {
|
|
printf(">>>%s: Can't encrypt with type %s (%d)\r\n",
|
|
Name,
|
|
ENCTYPE_NAME_OK(type)
|
|
? ENCTYPE_NAME(type) : "(unknown)",
|
|
type);
|
|
}
|
|
return;
|
|
}
|
|
if (ep->start) {
|
|
i = (*ep->start)(DIR_ENCRYPT, Server);
|
|
if (encrypt_debug_mode) {
|
|
printf(">>>%s: Encrypt start: %s (%d) %s\r\n",
|
|
Name,
|
|
(i < 0) ? "failed" :
|
|
"initial negotiation in progress",
|
|
i, ENCTYPE_NAME(type));
|
|
}
|
|
if (i)
|
|
return;
|
|
}
|
|
p = str_start + 3;
|
|
*p++ = ENCRYPT_START;
|
|
for (i = 0; i < ki[0].keylen; ++i) {
|
|
if ((*p++ = ki[0].keyid[i]) == IAC)
|
|
*p++ = IAC;
|
|
}
|
|
*p++ = IAC;
|
|
*p++ = SE;
|
|
telnet_net_write(str_start, p - str_start);
|
|
net_encrypt();
|
|
printsub('>', &str_start[2], p - &str_start[2]);
|
|
/*
|
|
* If we are already encrypting in some mode, then
|
|
* encrypt the ring (which includes our request) in
|
|
* the old mode, mark it all as "clear text" and then
|
|
* switch to the new mode.
|
|
*/
|
|
encrypt_output = ep->output;
|
|
encrypt_mode = type;
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: Started to encrypt output with type %s\r\n",
|
|
Name, ENCTYPE_NAME(type));
|
|
if (encrypt_verbose)
|
|
printf("[ Output is now encrypted with type %s ]\r\n",
|
|
ENCTYPE_NAME(type));
|
|
}
|
|
|
|
void
|
|
encrypt_send_end()
|
|
{
|
|
if (!encrypt_output)
|
|
return;
|
|
|
|
str_end[3] = ENCRYPT_END;
|
|
telnet_net_write(str_end, sizeof(str_end));
|
|
net_encrypt();
|
|
printsub('>', &str_end[2], sizeof(str_end) - 2);
|
|
/*
|
|
* Encrypt the output buffer now because it will not be done by
|
|
* netflush...
|
|
*/
|
|
encrypt_output = 0;
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: Output is back to clear text\r\n", Name);
|
|
if (encrypt_verbose)
|
|
printf("[ Output is now clear text ]\r\n");
|
|
}
|
|
|
|
void
|
|
encrypt_send_request_start()
|
|
{
|
|
register unsigned char *p;
|
|
register int i;
|
|
|
|
p = &str_start[3];
|
|
*p++ = ENCRYPT_REQSTART;
|
|
for (i = 0; i < ki[1].keylen; ++i) {
|
|
if ((*p++ = ki[1].keyid[i]) == IAC)
|
|
*p++ = IAC;
|
|
}
|
|
*p++ = IAC;
|
|
*p++ = SE;
|
|
telnet_net_write(str_start, p - str_start);
|
|
printsub('>', &str_start[2], p - &str_start[2]);
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: Request input to be encrypted\r\n", Name);
|
|
}
|
|
|
|
void
|
|
encrypt_send_request_end()
|
|
{
|
|
str_end[3] = ENCRYPT_REQEND;
|
|
telnet_net_write(str_end, sizeof(str_end));
|
|
printsub('>', &str_end[2], sizeof(str_end) - 2);
|
|
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: Request input to be clear text\r\n", Name);
|
|
}
|
|
|
|
void
|
|
encrypt_wait()
|
|
{
|
|
if (encrypt_debug_mode)
|
|
printf(">>>%s: in encrypt_wait\r\n", Name);
|
|
if (!havesessionkey || !(I_SUPPORT_ENCRYPT & remote_supports_decrypt))
|
|
return;
|
|
while (autoencrypt && !encrypt_output)
|
|
if (telnet_spin())
|
|
return;
|
|
}
|
|
|
|
void
|
|
encrypt_debug(mode)
|
|
int mode;
|
|
{
|
|
encrypt_debug_mode = mode;
|
|
}
|
|
|
|
void
|
|
encrypt_gen_printsub(data, cnt, buf, buflen)
|
|
unsigned char *data, *buf;
|
|
int cnt, buflen;
|
|
{
|
|
char tbuf[16], *cp;
|
|
|
|
cnt -= 2;
|
|
data += 2;
|
|
buf[buflen-1] = '\0';
|
|
buf[buflen-2] = '*';
|
|
buflen -= 2;
|
|
for (; cnt > 0; cnt--, data++) {
|
|
snprintf(tbuf, sizeof(tbuf), " %d", *data);
|
|
for (cp = tbuf; *cp && buflen > 0; --buflen)
|
|
*buf++ = *cp++;
|
|
if (buflen <= 0)
|
|
return;
|
|
}
|
|
*buf = '\0';
|
|
}
|
|
|
|
void
|
|
encrypt_printsub(data, cnt, buf, buflen)
|
|
unsigned char *data, *buf;
|
|
int cnt, buflen;
|
|
{
|
|
Encryptions *ep;
|
|
register int type = data[1];
|
|
|
|
for (ep = encryptions; ep->type && ep->type != type; ep++)
|
|
;
|
|
|
|
if (ep->printsub)
|
|
(*ep->printsub)(data, cnt, buf, buflen);
|
|
else
|
|
encrypt_gen_printsub(data, cnt, buf, buflen);
|
|
}
|
|
#endif /* ENCRYPTION */
|