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ck_crp.c
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char *ckcrpv = "Encryption Engine, 10.0.121, 23 Mar 2023";
/*
C K _ C R P . C - Cryptography for C-Kermit"
Copyright (C) 1998, 2023,
Trustees of Columbia University in the City of New York.
All rights reserved. See the C-Kermit COPYING.TXT file or the
copyright text in the ckcmai.c module for disclaimer and permissions.
Author:
Jeffrey E Altman ([email protected])
Secure Endpoints Inc., New York City
*/
#define CK_CRP_C
#ifdef CK_DES
#ifdef CK_SSL
#ifndef LIBDES
#define LIBDES
#endif /* LIBDES */
#endif /* CK_SSL */
#endif /* CK_DES */
#ifdef CRYPT_DLL
#define CK_AUTHENTICATION
#define CK_ENCRYPTION
#define CK_DES
#define CK_CAST
#ifndef LIBDES
#define LIBDES
#endif /* LIBDES */
#define TELCMDS /* to define name array */
#define TELOPTS /* to define name array */
#define ENCRYPT_NAMES
#endif /* CRYPT_DLL */
#include "ckcsym.h"
#include "ckcdeb.h"
#include "ckcnet.h"
#ifdef DEBUG
#undef DEBUG
#endif /* DEBUG */
#ifdef CK_AUTHENTICATION
#ifdef CK_ENCRYPTION
#define ENCRYPTION
#ifdef CK_DES
#define DES_ENCRYPTION
#endif /* CK_DES */
#ifdef CK_CAST
#define CAST_ENCRYPTION
#endif /* CK_CAST */
#ifdef COMMENT
#define CAST_EXPORT_ENCRYPTION
#endif /* COMMENT */
#endif /* CK_ENCRYPTION */
#endif /* CK_AUTHENTICATION */
#ifdef CK_ENCRYPTION
#include "ckucmd.h" /* For struct keytab definition */
#include "ckuath.h"
#include "ckuat2.h"
#ifdef MIT_CURRENT
#include <krb5.h>
#endif /* MIT_CURRENT */
#include <stdlib.h>
#include <string.h>
#ifdef OS2
#include <stdarg.h>
#ifdef OS2ONLY
#include <os2.h>
#undef COMMENT
#endif /* OS2ONLY */
#include "ckosyn.h"
#else /* OS2 */
static char * tmpstring = NULL;
#endif /* OS2 */
#ifndef CAST_OR_EXPORT
#ifdef CAST_ENCRYPTION
#define CAST_OR_EXPORT
#endif /* CAST_ENCRYPTION */
#ifdef CAST_EXPORT_ENCRYPTION
#define CAST_OR_EXPORT
#endif /* CAST_EXPORT_ENCRYPTION */
#endif /* CAST_OR_EXPORT */
#ifdef MACOSX
#undef LIBDES
#endif /* MACOSX */
#ifdef CRYPT_DLL
int cmd_quoting = 0;
#ifdef OS2
/* Copied from ckctel.c */
char *
#ifdef CK_ANSIC
tel_unk(int opt) /* "UNKNOWN-%u" string. */
#else
tel_unk(opt) int opt;
#endif /* CK_ANSIC */
{
/* 2024-03-27 SMS. Added (decimal) value to "UNKNOWN" messages. */
static char val_str[ 20];
sprintf(val_str, "UNKNOWN-%u", opt);
return(val_str);
}
#endif /* OS2 */
#ifndef TELOPT_MACRO
int
telopt_index(opt) int opt; {
if ( opt >= 0 && opt <= TELOPT_SEND_URL )
return(opt);
else if ( opt >= TELOPT_PRAGMA_LOGON && opt <= TELOPT_PRAGMA_HEARTBEAT )
return(opt-89);
else
return(NTELOPTS);
}
int
telopt_ok(opt) int opt; {
return((opt >= TELOPT_BINARY && opt <= TELOPT_SEND_URL) ||
(opt >= TELOPT_PRAGMA_LOGON && opt <= TELOPT_PRAGMA_HEARTBEAT));
}
CHAR *
telopt(opt) int opt; {
if ( telopt_ok(opt) )
return(telopts[telopt_index(opt)]);
else
return("UNKNOWN");
}
#endif /* TELOPT_MACRO */
static int (*p_ttol)(char *,int)=NULL;
static int (*p_dodebug)(int,char *,char *,CK_OFF_T)=NULL;
static int (*p_dohexdump)(char *,char *,int)=NULL;
static void (*p_tn_debug)(char *)=NULL;
static int (*p_scrnprint)(const char *)=NULL;
static void * p_k5_context=NULL;
static unsigned long (*p_reqtelmutex)(unsigned long)=NULL;
static unsigned long (*p_reltelmutex)(void)=NULL;
unsigned long
RequestTelnetMutex(unsigned long x)
{
if ( p_reqtelmutex )
return p_reqtelmutex(x);
return 0;
}
unsigned long
ReleaseTelnetMutex(void)
{
if ( p_reltelmutex )
return p_reltelmutex();
return 0;
}
int
ttol(char * s, int n)
{
if ( p_ttol )
return(p_ttol(s,n));
else
return(-1);
}
int
dodebug(int flag, char * s1, char * s2, CK_OFF_T n)
{
if ( p_dodebug )
return(p_dodebug(flag,s1,s2,n));
else
return(-1);
}
int
dohexdump( char * s1, char * s2, int n )
{
if ( p_dohexdump )
p_dohexdump(s1,s2,n);
return(0);
}
void
tn_debug( char * s )
{
if ( p_tn_debug )
p_tn_debug(s);
}
static char myprtfstr[4096];
int
Vscrnprintf(const char * format, ...) {
int i, len, rc=0;
char *cp;
va_list ap;
va_start(ap, format);
#ifdef NT
rc = _vsnprintf(myprtfstr, sizeof(myprtfstr)-1, format, ap);
#else /* NT */
rc = vsprintf(myprtfstr, format, ap);
#endif /* NT */
va_end(ap);
if ( p_scrnprint )
return(p_scrnprint(myprtfstr));
else
return(-1);
}
int
#ifdef CK_ANSIC
tn_hex(CHAR * buf, int buflen, CHAR * data, int datalen)
#else /* CK_ANSIC */
tn_hex(buf, buflen, data, datalen)
CHAR * buf;
int buflen;
CHAR * data;
int datalen;
#endif /* CK_ANSIC */
{
int i = 0, j = 0, k = 0;
CHAR tmp[8];
#ifdef COMMENT
int was_hex = 1;
for (k=0; k < datalen; k++) {
if (data[k] < 32 || data[k] >= 127) {
sprintf(tmp,"%s%02X ",was_hex?"":"\" ",data[k]);
was_hex = 1;
} else {
sprintf(tmp,"%s%c",was_hex?"\"":"",data[k]);
was_hex = 0;
}
ckstrncat(buf,tmp,buflen);
}
if (!was_hex)
ckstrncat(buf,"\" ",buflen);
#else /* COMMENT */
if (datalen <= 0 || data == NULL)
return(0);
for (i = 0; i < datalen; i++) {
ckstrncat(buf,"\r\n ",buflen);
for (j = 0 ; (j < 16); j++) {
if ((i + j) < datalen)
sprintf(tmp,
"%s%02x ",
(j == 8 ? "| " : ""),
(CHAR) data[i + j]
);
else
sprintf(tmp,
"%s ",
(j == 8 ? "| " : "")
);
ckstrncat(buf,tmp,buflen);
}
ckstrncat(buf," ",buflen);
for (k = 0; (k < 16) && ((i + k) < datalen); k++) {
sprintf(tmp,
"%s%c",
(k == 8 ? " " : ""),
isprint(data[i + k]) ? data[i + k] : '.'
);
ckstrncat(buf,tmp,buflen);
}
i += j - 1;
} /* end for */
ckstrncat(buf,"\r\n ",buflen);
#endif /* COMMENT */
return(strlen(buf));
}
#ifdef COMMENT
#define ttol dll_ttol
#define dodebug dll_dodebug
#define dohexdump dll_dohexdump
#define tn_debug dll_tn_debug
#define Vscrnprintf dll_vscrnprintf
#endif /* COMMENT */
char tn_msg[TN_MSG_LEN], hexbuf[TN_MSG_LEN]; /* from ckcnet.c */
int deblog=1, debses=1, tn_deb=1;
#else /* CRYPT_DLL */
extern char tn_msg[], hexbuf[]; /* from ckcnet.c */
extern int deblog, debses, tn_deb;
#ifdef MIT_CURRENT
extern krb5_context k5_context;
#endif /* MIT_CURRENT */
#endif /* CRYPT_DLL */
#ifdef LIBDES
#ifdef MACOSX
#define des_new_random_key ck_des_new_random_key
#define des_set_random_generator_seed ck_des_set_random_generator_seed
#define des_key_sched ck_des_key_sched
#define des_ecb_encrypt ck_des_ecb_encrypt
#define des_string_to_key ck_des_string_to_key
#define des_fixup_key_parity ck_des_fixup_key_parity
#endif /* MACOSX */
#ifndef UNIX
#define des_new_random_key des_random_key
#define des_set_random_generator_seed des_random_seed
#endif /* UNIX */
#define des_fixup_key_parity des_set_odd_parity
#ifdef OPENSSL_097
#define OPENSSL_ENABLE_OLD_DES_SUPPORT
#include <openssl/des.h>
#endif /* OPENSSL_097 */
#else /* LIBDES */
#ifdef UNIX
#define des_set_random_generator_seed(x) des_init_random_number_generator(x)
#endif /* UNIX */
#ifdef OS2
#define des_new_random_key ck_des_new_random_key
#define des_set_random_generator_seed ck_des_set_random_generator_seed
#define des_key_sched ck_des_key_sched
#define des_ecb_encrypt ck_des_ecb_encrypt
#define des_string_to_key ck_des_string_to_key
#define des_fixup_key_parity ck_des_fixup_key_parity
#endif /* OS2 */
#endif /* LIBDES */
#ifdef CK_DES
/* This code comes from Eric Young's libdes package and is not part */
/* of the standard MIT DES library that is part of Kerberos. However, */
/* it is extremely useful. So we add it here. */
/* Weak and semi week keys as take from
* %A D.W. Davies
* %A W.L. Price
* %T Security for Computer Networks
* %I John Wiley & Sons
* %D 1984
* Many thanks to [email protected] (Steven Bellovin) for the reference
* (and actual cblock values).
*/
#define NUM_WEAK_KEY 16
static Block weak_keys[NUM_WEAK_KEY]={
/* weak keys */
{0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
{0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},
{0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F},
{0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0,0xE0},
/* semi-weak keys */
{0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE},
{0xFE,0x01,0xFE,0x01,0xFE,0x01,0xFE,0x01},
{0x1F,0xE0,0x1F,0xE0,0x0E,0xF1,0x0E,0xF1},
{0xE0,0x1F,0xE0,0x1F,0xF1,0x0E,0xF1,0x0E},
{0x01,0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1},
{0xE0,0x01,0xE0,0x01,0xF1,0x01,0xF1,0x01},
{0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E,0xFE},
{0xFE,0x1F,0xFE,0x1F,0xFE,0x0E,0xFE,0x0E},
{0x01,0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E},
{0x1F,0x01,0x1F,0x01,0x0E,0x01,0x0E,0x01},
{0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1,0xFE},
{0xFE,0xE0,0xFE,0xE0,0xFE,0xF1,0xFE,0xF1}};
int
ck_des_is_weak_key(key)
Block key;
{
int i;
for (i=0; i<NUM_WEAK_KEY; i++) {
/* Added == 0 to comparision, I obviously don't run
* this section very often :-(, thanks to
* [email protected] for the fix
* eay 93/06/29
* Another problem, I was comparing only the first 4
* bytes, 97/03/18 */
if (memcmp(weak_keys[i],key,sizeof(Block)) == 0)
return(1);
}
return(0);
}
#ifdef UNIX
#ifdef LIBDES
#ifndef MACOSX
/* These functions are not part of Eric Young's DES library */
/* _unix_time_gmt_unixsec */
/* _des_set_random_generator_seed */
/* _des_fixup_key_parity (added in 0.9.5) */
/* _des_new_random_key */
#include <sys/time.h>
unsigned long
unix_time_gmt_unixsec (usecptr)
unsigned long *usecptr;
{
struct timeval now;
(void) gettimeofday (&now, (struct timezone *)0);
if (usecptr)
*usecptr = now.tv_usec;
return now.tv_sec;
}
void
des_set_random_generator_seed(Block B)
{
des_random_seed(B);
return;
}
#ifdef COMMENT
/* added to openssl in 0.9.5 */
void
des_fixup_key_parity(Block B)
{
des_set_odd_parity(B);
return;
}
#endif /* COMMENT */
int
des_new_random_key(Block B)
{
int rc=0;
/* WARNING:
This might need to have the "rc = " removed because this
is VOID in later, and maybe even all, versions.
*/
rc = des_random_key(B);
return(rc);
}
#endif /* MACOSX */
#endif /* LIBDES */
#endif /* UNIX */
#endif /* CK_DES */
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* based on @(#)encrypt.c 8.1 (Berkeley) 6/4/93 */
/*
* Copyright (C) 1990 by the Massachusetts Institute of Technology
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include <stdio.h>
/*
* These function pointers point to the current routines
* for encrypting and decrypting data.
*/
/* NOTE: These next two might need to have the "static " removed */
static VOID (*encrypt_output) P((unsigned char *, int));
static int (*decrypt_input) P((int));
#ifdef DEBUG
static int encrypt_debug_mode = 1;
static int encrypt_verbose = 1;
#else
static int encrypt_verbose = 1;
static int encrypt_debug_mode = 0;
#endif /* DEBUG */
static char dbgbuf [16384];
static int decrypt_mode = 0;
static int encrypt_mode = 0;
static int autoencrypt = 1;
static int autodecrypt = 1;
static int havesessionkey = 0;
static kstream EncryptKSGlobalHack = NULL;
static int EncryptType = ENCTYPE_ANY;
#define typemask(x) ((x) > 0 ? 1 << ((x)-1) : 0)
static long i_support_encrypt =
typemask(ENCTYPE_DES_CFB64) | typemask(ENCTYPE_DES_OFB64);
static long i_support_decrypt =
typemask(ENCTYPE_DES_CFB64) | typemask(ENCTYPE_DES_OFB64);
static long i_wont_support_encrypt = 0;
static long i_wont_support_decrypt = 0;
#define I_SUPPORT_ENCRYPT (i_support_encrypt & ~i_wont_support_encrypt)
#define I_SUPPORT_DECRYPT (i_support_decrypt & ~i_wont_support_decrypt)
static long remote_supports_encrypt = 0;
static long remote_supports_decrypt = 0;
/* Make sure that this list is in order of algorithm strength */
/* as it determines the search order for selecting specific */
/* encryption choices. All CFB modes must come before OFB modes. */
static Encryptions encryptions[] = {
#ifdef DES_ENCRYPTION
{ "DES3_CFB64",
ENCTYPE_DES3_CFB64,
des3_cfb64_encrypt,
des3_cfb64_decrypt,
des3_cfb64_init,
des3_cfb64_start,
des3_cfb64_is,
des3_cfb64_reply,
des3_cfb64_session,
des3_cfb64_keyid,
NULL },
#endif /* DES_ENCRYPTION */
#ifdef CAST_ENCRYPTION
#ifndef CAST_EXPORT_ENCRYPTION
{ "CAST128_CFB64", ENCTYPE_CAST128_CFB64,
cast_cfb64_encrypt,
cast_cfb64_decrypt,
cast_cfb64_init,
cast_cfb64_start,
cast_cfb64_is,
cast_cfb64_reply,
cast_cfb64_session,
cast_cfb64_keyid,
NULL },
#endif
#endif
#ifdef DES_ENCRYPTION
{ "DES_CFB64",
ENCTYPE_DES_CFB64,
cfb64_encrypt,
cfb64_decrypt,
cfb64_init,
cfb64_start,
cfb64_is,
cfb64_reply,
cfb64_session,
cfb64_keyid,
NULL },
#endif /* DES_ENCRYPTION */
#if defined (CAST_EXPORT_ENCRYPTION) || defined(CAST_ENCRYPTION)
{ "CAST5_40_CFB64", ENCTYPE_CAST5_40_CFB64,
castexp_cfb64_encrypt,
castexp_cfb64_decrypt,
castexp_cfb64_init,
castexp_cfb64_start,
castexp_cfb64_is,
castexp_cfb64_reply,
castexp_cfb64_session,
castexp_cfb64_keyid,
NULL },
#endif /* CAST_ENCRYPTION */
#ifdef DES_ENCRYPTION
{ "DES3_OFB64",
ENCTYPE_DES3_OFB64,
des3_ofb64_encrypt,
des3_ofb64_decrypt,
des3_ofb64_init,
des3_ofb64_start,
des3_ofb64_is,
des3_ofb64_reply,
des3_ofb64_session,
des3_ofb64_keyid,
NULL },
#endif /* DES_ENCRYPTION */
#ifdef CAST_ENCRYPTION
#ifndef CAST_EXPORT_ENCRYPTION
{ "CAST128_OFB64", ENCTYPE_CAST128_OFB64,
cast_ofb64_encrypt,
cast_ofb64_decrypt,
cast_ofb64_init,
cast_ofb64_start,
cast_ofb64_is,
cast_ofb64_reply,
cast_ofb64_session,
cast_ofb64_keyid,
NULL },
#endif
#endif
#ifdef DES_ENCRYPTION
{ "DES_OFB64",
ENCTYPE_DES_OFB64,
ofb64_encrypt,
ofb64_decrypt,
ofb64_init,
ofb64_start,
ofb64_is,
ofb64_reply,
ofb64_session,
ofb64_keyid,
NULL },
#endif /* DES_ENCRYPTION */
#if defined (CAST_EXPORT_ENCRYPTION) || defined(CAST_ENCRYPTION)
{ "CAST5_40_OFB64", ENCTYPE_CAST5_40_OFB64,
castexp_ofb64_encrypt,
castexp_ofb64_decrypt,
castexp_ofb64_init,
castexp_ofb64_start,
castexp_ofb64_is,
castexp_ofb64_reply,
castexp_ofb64_session,
castexp_ofb64_keyid,
NULL },
#endif /* CAST_ENCRYPTION */
{ 0,0,0,0,0,0,0,0,0,0,0 }
};
int
get_crypt_table( struct keytab ** pTable, int * pN )
{
int i=0,n=0;
if ( *pTable )
{
for ( i=0 ; i < *pN ; i++ )
free( (*pTable)[i].kwd ) ;
free ( *pTable ) ;
}
*pTable = NULL;
*pN = 0;
/* How many encryption types do we have? */
while ( encryptions[n].name )
n++;
if ( n )
{
*pTable = malloc( sizeof(struct keytab) * (n+2) ) ;
if ( !(*pTable) )
return(0);
#ifdef OS2
(*pTable)[0].kwd =strdup("automatic");
#else /* OS2 */
makestr(&tmpstring,"automatic");
(*pTable)[0].kwd = tmpstring;
tmpstring = NULL;
#endif /* OS2 */
(*pTable)[0].kwval = ENCTYPE_ANY;
(*pTable)[0].flgs = 0;
#ifdef OS2
(*pTable)[1].kwd =strdup("none");
#else /* OS2 */
makestr(&tmpstring,"none");
(*pTable)[1].kwd = tmpstring;
tmpstring = NULL;
#endif /* OS2 */
(*pTable)[1].kwval = 999;
(*pTable)[1].flgs = 0;
(*pN) = 2;
for ( i=0 ; i < n ; i++ ) {
char * newstr = NULL, * p;
int newval = encryptions[i].type;
int j = 0, len = 0;
#ifdef OS2
newstr = strdup(encryptions[i].name);
strlwr(newstr);
#else /* OS2 */
makestr(&tmpstring,encryptions[i].name);
newstr = tmpstring;
tmpstring = NULL;
for (p = newstr; *p; p++) if (isupper(*p)) *p = tolower(*p);
#endif /* OS2 */
for (j = 0; j < (*pN); j++) {
int tempval = 0;
char * tempstr = NULL;
if ( strcmp( (*pTable)[j].kwd, newstr ) > 0 )
{
tempval = (*pTable)[j].kwval;
tempstr = (*pTable)[j].kwd;
(*pTable)[j].kwd = newstr ;
(*pTable)[j].kwval = newval;
newval = tempval;
newstr = tempstr;
(*pTable)[j].flgs = 0;
}
}
(*pTable)[*pN].kwd = newstr ;
(*pTable)[*pN].kwval = newval;
(*pTable)[*pN].flgs = 0 ;
(*pN)++ ;
}
} else {
*pTable = malloc( sizeof(struct keytab) * 2 ) ;
if ( !(*pTable) )
return(0);
#ifdef OS2
(*pTable)[0].kwd =strdup("automatic");
#else /* OS2 */
makestr(&tmpstring,"automatic");
(*pTable)[0].kwd = tmpstring;
tmpstring = NULL;
#endif /* OS2 */
(*pTable)[0].kwval = ENCTYPE_ANY;
(*pTable)[0].flgs = 0;
#ifdef OS2
(*pTable)[1].kwd =strdup("none");
#else /* OS2 */
makestr(&tmpstring,"none");
(*pTable)[1].kwd = tmpstring;
tmpstring = NULL;
#endif /* OS2 */
(*pTable)[1].kwval = 999;
(*pTable)[1].flgs = 0;
(*pN) = 2;
}
return(*pN);
}
static unsigned char str_send[64] = { IAC, SB, TELOPT_ENCRYPTION,
ENCRYPT_SUPPORT };
static unsigned char str_suplen = 0;
static unsigned char str_start[72] = { IAC, SB, TELOPT_ENCRYPTION };
static unsigned char str_end[] = { IAC, SB, TELOPT_ENCRYPTION, 0, IAC, SE };
_PROTOTYP(int encrypt_request_end, (VOID));
_PROTOTYP(int encrypt_request_start, (VOID));
_PROTOTYP(int encrypt_enc_keyid, (unsigned char *, int));
_PROTOTYP(int encrypt_dec_keyid, (unsigned char *, int));
_PROTOTYP(int encrypt_support, (unsigned char *, int));
_PROTOTYP(int encrypt_start, (unsigned char *, int));
_PROTOTYP(int encrypt_end, (VOID));
_PROTOTYP(int encrypt_ks_stream,(struct kstream_data_block *, /* output */
struct kstream_data_block *)); /* input */
_PROTOTYP(int decrypt_ks_stream,(struct kstream_data_block *, /* output */
struct kstream_data_block *)); /* input */
int
#ifdef CK_ANSIC
encrypt_ks_stream(struct kstream_data_block *i,
struct kstream_data_block *o)
#else
encrypt_ks_stream(i,o)
struct kstream_data_block *i; struct kstream_data_block *o;
#endif
{
/*
* this is really quite bogus, since it does an in-place encryption...
*/
if (encrypt_output) {
encrypt_output(i->ptr, i->length);
return 1;
}
return 0;
}
int
#ifdef CK_ANSIC
decrypt_ks_stream(struct kstream_data_block *i,
struct kstream_data_block *o)
#else
decrypt_ks_stream(i,o)
struct kstream_data_block *i; struct kstream_data_block *o;
#endif
{
unsigned int len;
/*
* this is really quite bogus, since it does an in-place decryption...
*/
if (decrypt_input) {
for (len = 0 ; len < i->length ; len++)
((unsigned char *)i->ptr)[len]
= decrypt_input(((unsigned char *)i->ptr)[len]);
return 1;
}
return 0;
}
int
#ifdef CK_ANSIC
decrypt_ks_hack(unsigned char *buf, int cnt)
#else
decrypt_ks_hack(buf,cnt) unsigned char *buf; int cnt;
#endif
{
int len;
/*
* this is really quite bogus, since it does an in-place decryption...
*/
for (len = 0 ; len < cnt ; len++)
buf[len] = decrypt_input(buf[len]);
#ifdef DEBUG
ckhexdump("decrypt ks hack", buf, cnt);
#endif
return 1;
}
/*
* parsedat[0] == the suboption we might be negotiating,
*/
int
#ifdef CK_ANSIC
encrypt_parse(unsigned char *parsedat, int end_sub)
#else
encrypt_parse(parsedat,end_sub) unsigned char *parsedat; int end_sub;
#endif
{
int rc = 0;
switch(parsedat[1]) {
case ENCRYPT_START:
rc = encrypt_start(parsedat + 2, end_sub - 2);
break;
case ENCRYPT_END:
rc = encrypt_end();
break;
case ENCRYPT_SUPPORT:
rc = encrypt_support(parsedat + 2, end_sub - 2);
break;
case ENCRYPT_REQSTART:
rc = encrypt_request_start();
break;
case ENCRYPT_REQEND:
/*
* We can always send an REQEND so that we cannot
* get stuck encrypting. We should only get this
* if we have been able to get in the correct mode
* anyhow.
*/
rc = encrypt_request_end();
break;
case ENCRYPT_IS:
rc = encrypt_is(parsedat + 2, end_sub - 2);
break;
case ENCRYPT_REPLY:
rc = encrypt_reply(parsedat + 2, end_sub - 2);
break;
case ENCRYPT_ENC_KEYID:
rc = encrypt_enc_keyid(parsedat + 2, end_sub - 2);
break;
case ENCRYPT_DEC_KEYID:
rc = encrypt_dec_keyid(parsedat + 2, end_sub - 2);
break;
default:
rc = -1;
break;
}
return(rc);
}
/* XXX */
Encryptions *
#ifdef CK_ANSIC
findencryption(int type)
#else
findencryption(type) int type;
#endif
{
Encryptions *ep = encryptions;
if (!(I_SUPPORT_ENCRYPT & remote_supports_decrypt & typemask(type)))
return(0);
while (ep->type && ep->type != type)
++ep;
return(ep->type ? ep : 0);
}
Encryptions *
#ifdef CK_ANSIC
finddecryption(int type)
#else
finddecryption(type) int type;
#endif
{
Encryptions *ep = encryptions;
if (!(I_SUPPORT_DECRYPT & remote_supports_encrypt & typemask(type)))
return(0);
while (ep->type && ep->type != type)
++ep;
return(ep->type ? ep : 0);
}
#define MAXKEYLEN 64
static struct key_info {
unsigned char keyid[MAXKEYLEN];
int keylen;
int dir;
int *modep;
Encryptions *(*getcrypt)();
} ki[2] = {
{ { 0 }, 0, DIR_ENCRYPT, &encrypt_mode, findencryption },
{ { 0 }, 0, DIR_DECRYPT, &decrypt_mode, finddecryption },
};
VOID
#ifdef CK_ANSIC
encrypt_init(kstream iks, int type)
#else
encrypt_init(iks, type) kstream iks; int type;
#endif
{
Encryptions *ep = encryptions;
i_support_encrypt = i_support_decrypt = 0;
remote_supports_encrypt = remote_supports_decrypt = 0;
i_wont_support_encrypt = i_wont_support_decrypt = 0;
encrypt_mode = 0;
decrypt_mode = 0;
encrypt_output = NULL;
decrypt_input = NULL;
ki[0].keylen = 0;
memset(ki[0].keyid,0,MAXKEYLEN);
ki[1].keylen = 0;
memset(ki[1].keyid,0,MAXKEYLEN);
havesessionkey = 0;
autoencrypt = 1;
autodecrypt = 1;
EncryptKSGlobalHack = iks;
EncryptType = type;
str_send[0] = IAC;
str_send[1] = SB;
str_send[2] = TELOPT_ENCRYPTION;
str_send[3] = ENCRYPT_SUPPORT;
str_suplen = 4;
while (ep->type) {
if ( EncryptType == ENCTYPE_ANY ||
EncryptType == ep->type ) {
#ifdef DEBUG
if (encrypt_debug_mode) {
sprintf(dbgbuf, ">>>I will support %s\n",
ENCTYPE_NAME(ep->type)); /* safe */
debug(F110,"encrypt_init",dbgbuf,0);
}
#endif
i_support_encrypt |= typemask(ep->type);
i_support_decrypt |= typemask(ep->type);
if ((i_wont_support_decrypt & typemask(ep->type)) == 0)
if ((str_send[str_suplen++] = ep->type) == IAC)
str_send[str_suplen++] = IAC;
}
if (ep->init)
(*ep->init)(0);
++ep;
}
str_send[str_suplen++] = IAC;
str_send[str_suplen++] = SE;
}
VOID