| 1 |
/*
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| 2 |
Copyright (c) 1998-2001, Robert O'Callahan
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| 3 |
All rights reserved.
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| 5 |
Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list of
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conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this list
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of conditions and the following disclaimer in the documentation and/or other materials
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provided with the distribution.
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The name of Robert O'Callahan may not be used to endorse or promote products derived from
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this software without specific prior written permission.
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| 18 |
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
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| 19 |
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 23 |
SUBSTITUTE GOODS 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 LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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| 29 |
#define WINDOWS
|
| 30 |
|
| 31 |
#include "ttxssh.h"
|
| 32 |
#include "util.h"
|
| 33 |
|
| 34 |
#include <openssl/rand.h>
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| 35 |
#include <openssl/bn.h>
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| 36 |
#include <openssl/md5.h>
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| 37 |
#include <openssl/err.h>
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| 38 |
#include <openssl/des.h>
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| 39 |
#include <openssl/hmac.h> // for SSH2(yutaka)
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| 40 |
#include <openssl/dsa.h>
|
| 41 |
#include "cipher.h"
|
| 42 |
#include "ssh.h"
|
| 43 |
|
| 44 |
#define do_crc(buf, len) (~(uint32)crc32(0xFFFFFFFF, (buf), (len)))
|
| 45 |
#define get_uint32(buf) get_uint32_MSBfirst((buf))
|
| 46 |
|
| 47 |
#define DEATTACK_OK 0
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| 48 |
#define DEATTACK_DETECTED 1
|
| 49 |
|
| 50 |
/*
|
| 51 |
* $Id: crypt.c,v 1.17 2007-10-18 07:56:33 maya Exp $ Cryptographic attack
|
| 52 |
* detector for ssh - source code (C)1998 CORE-SDI, Buenos Aires Argentina
|
| 53 |
* Ariel Futoransky(futo@core-sdi.com) <http://www.core-sdi.com>
|
| 54 |
*/
|
| 55 |
|
| 56 |
/* SSH Constants */
|
| 57 |
#define SSH_BLOCKSIZE 8
|
| 58 |
|
| 59 |
/* Hashing constants */
|
| 60 |
#define HASH_MINSIZE 8*2048
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| 61 |
#define HASH_ENTRYSIZE 4
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| 62 |
#define HASH_FACTOR(x) ((x)*3/2)
|
| 63 |
#define HASH_UNUSEDCHAR 0xff
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| 64 |
#define HASH_UNUSED 0xffffffff
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| 65 |
#define HASH_IV 0xfffffffe
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| 66 |
|
| 67 |
#define HASH_MINBLOCKS (7*SSH_BLOCKSIZE)
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| 68 |
|
| 69 |
/* Hash function (Input keys are cipher results) */
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| 70 |
#define HASH(x) get_uint32(x)
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| 71 |
|
| 72 |
#define CMP(a,b) memcmp(a, b, SSH_BLOCKSIZE)
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| 73 |
|
| 74 |
|
| 75 |
|
| 76 |
static void crc_update(uint32 FAR * a, uint32 b)
|
| 77 |
{
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| 78 |
b ^= *a;
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*a = do_crc((unsigned char FAR *) &b, sizeof(b));
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| 80 |
}
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| 81 |
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| 82 |
/* check_crc
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| 83 |
detects if a block is used in a particular pattern
|
| 84 |
*/
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| 86 |
static int check_crc(unsigned char FAR * S, unsigned char FAR * buf,
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| 87 |
uint32 len, unsigned char FAR * IV)
|
| 88 |
{
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| 89 |
uint32 crc;
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| 90 |
unsigned char FAR *c;
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| 91 |
|
| 92 |
crc = 0;
|
| 93 |
if (IV && !CMP(S, IV)) {
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| 94 |
crc_update(&crc, 1);
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| 95 |
crc_update(&crc, 0);
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| 96 |
}
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| 97 |
for (c = buf; c < buf + len; c += SSH_BLOCKSIZE) {
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| 98 |
if (!CMP(S, c)) {
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crc_update(&crc, 1);
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| 100 |
crc_update(&crc, 0);
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| 101 |
} else {
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| 102 |
crc_update(&crc, 0);
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| 103 |
crc_update(&crc, 0);
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| 104 |
}
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| 105 |
}
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|
| 107 |
return crc == 0;
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| 108 |
}
|
| 109 |
|
| 110 |
|
| 111 |
/*
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| 112 |
detect_attack
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| 113 |
Detects a crc32 compensation attack on a packet
|
| 114 |
*/
|
| 115 |
static int detect_attack(CRYPTDetectAttack FAR * statics,
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| 116 |
unsigned char FAR * buf, uint32 len,
|
| 117 |
unsigned char *FAR IV)
|
| 118 |
{
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| 119 |
uint32 FAR *h = statics->h;
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| 120 |
uint32 n = statics->n;
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| 121 |
uint32 i, j;
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| 122 |
uint32 l;
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unsigned char FAR *c;
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| 124 |
unsigned char FAR *d;
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| 125 |
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| 126 |
for (l = n; l < HASH_FACTOR(len / SSH_BLOCKSIZE); l = l << 2) {
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| 127 |
}
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| 128 |
|
| 129 |
if (h == NULL) {
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| 130 |
n = l;
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| 131 |
h = (uint32 FAR *) malloc(n * HASH_ENTRYSIZE);
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| 132 |
} else {
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| 133 |
if (l > n) {
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| 134 |
n = l;
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| 135 |
h = (uint32 FAR *) realloc(h, n * HASH_ENTRYSIZE);
|
| 136 |
}
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| 137 |
}
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| 138 |
|
| 139 |
statics->h = h;
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| 140 |
statics->n = n;
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| 141 |
|
| 142 |
if (len <= HASH_MINBLOCKS) {
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| 143 |
for (c = buf; c < buf + len; c += SSH_BLOCKSIZE) {
|
| 144 |
if (IV && (!CMP(c, IV))) {
|
| 145 |
if ((check_crc(c, buf, len, IV)))
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| 146 |
return DEATTACK_DETECTED;
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| 147 |
else
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break;
|
| 149 |
}
|
| 150 |
for (d = buf; d < c; d += SSH_BLOCKSIZE) {
|
| 151 |
if (!CMP(c, d)) {
|
| 152 |
if ((check_crc(c, buf, len, IV)))
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| 153 |
return DEATTACK_DETECTED;
|
| 154 |
else
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| 155 |
break;
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| 156 |
}
|
| 157 |
}
|
| 158 |
}
|
| 159 |
return (DEATTACK_OK);
|
| 160 |
}
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memset(h, HASH_UNUSEDCHAR, n * HASH_ENTRYSIZE);
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| 162 |
|
| 163 |
if (IV) {
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h[HASH(IV) & (n - 1)] = HASH_IV;
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}
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| 166 |
|
| 167 |
for (c = buf, j = 0; c < (buf + len); c += SSH_BLOCKSIZE, j++) {
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| 168 |
for (i = HASH(c) & (n - 1); h[i] != HASH_UNUSED;
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i = (i + 1) & (n - 1)) {
|
| 170 |
if (h[i] == HASH_IV) {
|
| 171 |
if (!CMP(c, IV)) {
|
| 172 |
if (check_crc(c, buf, len, IV))
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| 173 |
return DEATTACK_DETECTED;
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| 174 |
else
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break;
|
| 176 |
}
|
| 177 |
} else if (!CMP(c, buf + h[i] * SSH_BLOCKSIZE)) {
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| 178 |
if (check_crc(c, buf, len, IV))
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| 179 |
return DEATTACK_DETECTED;
|
| 180 |
else
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| 181 |
break;
|
| 182 |
}
|
| 183 |
}
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| 184 |
h[i] = j;
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| 185 |
}
|
| 186 |
|
| 187 |
return DEATTACK_OK;
|
| 188 |
}
|
| 189 |
|
| 190 |
BOOL CRYPT_detect_attack(PTInstVar pvar, unsigned char FAR * buf,
|
| 191 |
int bytes)
|
| 192 |
{
|
| 193 |
if (SSHv1(pvar)) {
|
| 194 |
switch (pvar->crypt_state.sender_cipher) {
|
| 195 |
case SSH_CIPHER_NONE:
|
| 196 |
return FALSE;
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| 197 |
case SSH_CIPHER_IDEA:
|
| 198 |
return detect_attack(&pvar->crypt_state.detect_attack_statics,
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| 199 |
buf, bytes,
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| 200 |
pvar->crypt_state.dec.cIDEA.ivec) ==
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| 201 |
DEATTACK_DETECTED;
|
| 202 |
default:
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| 203 |
return detect_attack(&pvar->crypt_state.detect_attack_statics,
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buf, bytes, NULL) == DEATTACK_DETECTED;
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| 205 |
}
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| 206 |
} else {
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| 207 |
return FALSE;
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| 208 |
}
|
| 209 |
}
|
| 210 |
|
| 211 |
static void no_encrypt(PTInstVar pvar, unsigned char FAR * buf, int bytes)
|
| 212 |
{
|
| 213 |
}
|
| 214 |
|
| 215 |
|
| 216 |
// for SSH2(yutaka)
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| 217 |
// 事前に設定する鍵長が違うだけなので、AES192, AES256 でも
|
| 218 |
// cAES128_encrypt/cAES128_decrypt を使用できる (2007.10.16 maya)
|
| 219 |
static void cAES128_encrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 220 |
int bytes)
|
| 221 |
{
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| 222 |
unsigned char *newbuf = malloc(bytes);
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| 223 |
int block_size = pvar->ssh2_keys[MODE_OUT].enc.block_size;
|
| 224 |
|
| 225 |
// 事前復号化により、全ペイロードが復号化されている場合は、0バイトになる。(2004.11.7 yutaka)
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| 226 |
if (bytes == 0)
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| 227 |
return;
|
| 228 |
|
| 229 |
if (newbuf == NULL)
|
| 230 |
return;
|
| 231 |
|
| 232 |
if (bytes % block_size) {
|
| 233 |
char tmp[80];
|
| 234 |
UTIL_get_lang_msg("MSG_AES128_ENCRYPT_ERROR1", pvar,
|
| 235 |
"AES128 encrypt error(1): bytes %d (%d)");
|
| 236 |
_snprintf_s(tmp, sizeof(tmp), _TRUNCATE,
|
| 237 |
pvar->ts->UIMsg, bytes, block_size);
|
| 238 |
notify_fatal_error(pvar, tmp);
|
| 239 |
goto error;
|
| 240 |
}
|
| 241 |
|
| 242 |
if (EVP_Cipher(&pvar->evpcip[MODE_OUT], newbuf, buf, bytes) == 0) {
|
| 243 |
UTIL_get_lang_msg("MSG_AES128_ENCRYPT_ERROR2", pvar,
|
| 244 |
"AES128 encrypt error(2)");
|
| 245 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 246 |
goto error;
|
| 247 |
|
| 248 |
} else {
|
| 249 |
//unsigned char key[AES128_KEYLEN], iv[AES128_IVLEN];
|
| 250 |
//memcpy(key, pvar->ssh2_keys[MODE_OUT].enc.key, AES128_KEYLEN);
|
| 251 |
// IVはDES関数内で更新されるため、ローカルにコピーしてから使う。
|
| 252 |
//memcpy(iv, pvar->ssh2_keys[MODE_OUT].enc.iv, AES128_IVLEN);
|
| 253 |
|
| 254 |
//debug_print(50, key, 24);
|
| 255 |
//debug_print(51, iv, 8);
|
| 256 |
//debug_print(52, buf, bytes);
|
| 257 |
//debug_print(53, newbuf, bytes);
|
| 258 |
|
| 259 |
memcpy(buf, newbuf, bytes);
|
| 260 |
}
|
| 261 |
|
| 262 |
error:
|
| 263 |
free(newbuf);
|
| 264 |
}
|
| 265 |
|
| 266 |
static void cAES128_decrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 267 |
int bytes)
|
| 268 |
{
|
| 269 |
unsigned char *newbuf = malloc(bytes);
|
| 270 |
int block_size = pvar->ssh2_keys[MODE_IN].enc.block_size;
|
| 271 |
|
| 272 |
// 事前復号化により、全ペイロードが復号化されている場合は、0バイトになる。(2004.11.7 yutaka)
|
| 273 |
if (bytes == 0)
|
| 274 |
return;
|
| 275 |
|
| 276 |
if (newbuf == NULL)
|
| 277 |
return;
|
| 278 |
|
| 279 |
if (bytes % block_size) {
|
| 280 |
char tmp[80];
|
| 281 |
UTIL_get_lang_msg("MSG_AES128_DECRYPT_ERROR1", pvar,
|
| 282 |
"AES128 decrypt error(1): bytes %d (%d)");
|
| 283 |
_snprintf_s(tmp, sizeof(tmp), _TRUNCATE, pvar->ts->UIMsg, bytes, block_size);
|
| 284 |
notify_fatal_error(pvar, tmp);
|
| 285 |
goto error;
|
| 286 |
}
|
| 287 |
|
| 288 |
if (EVP_Cipher(&pvar->evpcip[MODE_IN], newbuf, buf, bytes) == 0) {
|
| 289 |
UTIL_get_lang_msg("MSG_AES128_DECRYPT_ERROR2", pvar,
|
| 290 |
"AES128 decrypt error(2)");
|
| 291 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 292 |
goto error;
|
| 293 |
|
| 294 |
} else {
|
| 295 |
//unsigned char key[AES128_KEYLEN], iv[AES128_IVLEN];
|
| 296 |
//memcpy(key, pvar->ssh2_keys[MODE_IN].enc.key, AES128_KEYLEN);
|
| 297 |
// IVはDES関数内で更新されるため、ローカルにコピーしてから使う。
|
| 298 |
//memcpy(iv, pvar->ssh2_keys[MODE_IN].enc.iv, AES128_IVLEN);
|
| 299 |
|
| 300 |
//debug_print(70, key, AES128_KEYLEN);
|
| 301 |
//debug_print(71, iv, AES128_IVLEN);
|
| 302 |
//debug_print(72, buf, bytes);
|
| 303 |
//debug_print(73, newbuf, bytes);
|
| 304 |
|
| 305 |
memcpy(buf, newbuf, bytes);
|
| 306 |
}
|
| 307 |
|
| 308 |
error:
|
| 309 |
free(newbuf);
|
| 310 |
}
|
| 311 |
|
| 312 |
|
| 313 |
|
| 314 |
// for SSH2(yutaka)
|
| 315 |
static void c3DES_CBC_encrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 316 |
int bytes)
|
| 317 |
{
|
| 318 |
unsigned char *newbuf = malloc(bytes);
|
| 319 |
int block_size = pvar->ssh2_keys[MODE_OUT].enc.block_size;
|
| 320 |
|
| 321 |
// 事前復号化により、全ペイロードが復号化されている場合は、0バイトになる。(2004.11.7 yutaka)
|
| 322 |
if (bytes == 0)
|
| 323 |
return;
|
| 324 |
|
| 325 |
if (newbuf == NULL)
|
| 326 |
return;
|
| 327 |
|
| 328 |
if (bytes % block_size) {
|
| 329 |
char tmp[80];
|
| 330 |
UTIL_get_lang_msg("MSG_3DESCBC_ENCRYPT_ERROR1", pvar,
|
| 331 |
"3DES-CBC encrypt error(1): bytes %d (%d)");
|
| 332 |
_snprintf_s(tmp, sizeof(tmp), _TRUNCATE,
|
| 333 |
pvar->ts->UIMsg, bytes, block_size);
|
| 334 |
notify_fatal_error(pvar, tmp);
|
| 335 |
goto error;
|
| 336 |
}
|
| 337 |
|
| 338 |
if (EVP_Cipher(&pvar->evpcip[MODE_OUT], newbuf, buf, bytes) == 0) {
|
| 339 |
UTIL_get_lang_msg("MSG_3DESCBC_ENCRYPT_ERROR2", pvar,
|
| 340 |
"3DES-CBC encrypt error(2)");
|
| 341 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 342 |
goto error;
|
| 343 |
|
| 344 |
} else {
|
| 345 |
//unsigned char key[24], iv[8];
|
| 346 |
//memcpy(key, pvar->ssh2_keys[MODE_OUT].enc.key, 24);
|
| 347 |
// IVはDES関数内で更新されるため、ローカルにコピーしてから使う。
|
| 348 |
//memcpy(iv, pvar->ssh2_keys[MODE_OUT].enc.iv, 8);
|
| 349 |
|
| 350 |
//debug_print(50, key, 24);
|
| 351 |
//debug_print(51, iv, 8);
|
| 352 |
//debug_print(52, buf, bytes);
|
| 353 |
//debug_print(53, newbuf, bytes);
|
| 354 |
|
| 355 |
memcpy(buf, newbuf, bytes);
|
| 356 |
}
|
| 357 |
|
| 358 |
error:
|
| 359 |
free(newbuf);
|
| 360 |
}
|
| 361 |
|
| 362 |
static void c3DES_CBC_decrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 363 |
int bytes)
|
| 364 |
{
|
| 365 |
unsigned char *newbuf = malloc(bytes);
|
| 366 |
int block_size = pvar->ssh2_keys[MODE_IN].enc.block_size;
|
| 367 |
|
| 368 |
// 事前復号化により、全ペイロードが復号化されている場合は、0バイトになる。(2004.11.7 yutaka)
|
| 369 |
if (bytes == 0)
|
| 370 |
return;
|
| 371 |
|
| 372 |
if (newbuf == NULL)
|
| 373 |
return;
|
| 374 |
|
| 375 |
if (bytes % block_size) {
|
| 376 |
char tmp[80];
|
| 377 |
UTIL_get_lang_msg("MSG_3DESCBC_DECRYPT_ERROR1", pvar,
|
| 378 |
"3DES-CBC decrypt error(1): bytes %d (%d)");
|
| 379 |
_snprintf_s(tmp, sizeof(tmp), _TRUNCATE, pvar->ts->UIMsg, bytes, block_size);
|
| 380 |
notify_fatal_error(pvar, tmp);
|
| 381 |
goto error;
|
| 382 |
}
|
| 383 |
|
| 384 |
if (EVP_Cipher(&pvar->evpcip[MODE_IN], newbuf, buf, bytes) == 0) {
|
| 385 |
UTIL_get_lang_msg("MSG_3DESCBC_DECRYPT_ERROR2", pvar,
|
| 386 |
"3DES-CBC decrypt error(2)");
|
| 387 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 388 |
goto error;
|
| 389 |
|
| 390 |
} else {
|
| 391 |
//unsigned char key[24], iv[8];
|
| 392 |
//memcpy(key, pvar->ssh2_keys[MODE_IN].enc.key, 24);
|
| 393 |
// IVはDES関数内で更新されるため、ローカルにコピーしてから使う。
|
| 394 |
//memcpy(iv, pvar->ssh2_keys[MODE_IN].enc.iv, 8);
|
| 395 |
|
| 396 |
//debug_print(70, key, 24);
|
| 397 |
//debug_print(71, iv, 8);
|
| 398 |
//debug_print(72, buf, bytes);
|
| 399 |
//debug_print(73, newbuf, bytes);
|
| 400 |
|
| 401 |
memcpy(buf, newbuf, bytes);
|
| 402 |
}
|
| 403 |
|
| 404 |
error:
|
| 405 |
free(newbuf);
|
| 406 |
}
|
| 407 |
|
| 408 |
|
| 409 |
static void cBlowfish_encrypt2(PTInstVar pvar, unsigned char FAR * buf,
|
| 410 |
int bytes)
|
| 411 |
{
|
| 412 |
unsigned char *newbuf = malloc(bytes);
|
| 413 |
int block_size = pvar->ssh2_keys[MODE_OUT].enc.block_size;
|
| 414 |
|
| 415 |
// 事前復号化により、全ペイロードが復号化されている場合は、0バイトになる。(2004.11.7 yutaka)
|
| 416 |
if (bytes == 0)
|
| 417 |
return;
|
| 418 |
|
| 419 |
if (newbuf == NULL)
|
| 420 |
return;
|
| 421 |
|
| 422 |
if (bytes % block_size) {
|
| 423 |
char tmp[80];
|
| 424 |
UTIL_get_lang_msg("MSG_BLOWFISH_ENCRYPT_ERROR1", pvar,
|
| 425 |
"Blowfish encrypt error(1): bytes %d (%d)");
|
| 426 |
_snprintf_s(tmp, sizeof(tmp), _TRUNCATE,
|
| 427 |
pvar->ts->UIMsg, bytes, block_size);
|
| 428 |
notify_fatal_error(pvar, tmp);
|
| 429 |
goto error;
|
| 430 |
}
|
| 431 |
|
| 432 |
if (EVP_Cipher(&pvar->evpcip[MODE_OUT], newbuf, buf, bytes) == 0) {
|
| 433 |
UTIL_get_lang_msg("MSG_BLOWFISH_ENCRYPT_ERROR2", pvar,
|
| 434 |
"Blowfish encrypt error(2)");
|
| 435 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 436 |
goto error;
|
| 437 |
|
| 438 |
} else {
|
| 439 |
memcpy(buf, newbuf, bytes);
|
| 440 |
|
| 441 |
}
|
| 442 |
|
| 443 |
error:
|
| 444 |
free(newbuf);
|
| 445 |
}
|
| 446 |
|
| 447 |
static void cBlowfish_decrypt2(PTInstVar pvar, unsigned char FAR * buf,
|
| 448 |
int bytes)
|
| 449 |
{
|
| 450 |
unsigned char *newbuf = malloc(bytes);
|
| 451 |
int block_size = pvar->ssh2_keys[MODE_IN].enc.block_size;
|
| 452 |
|
| 453 |
// 事前復号化により、全ペイロードが復号化されている場合は、0バイトになる。(2004.11.7 yutaka)
|
| 454 |
if (bytes == 0)
|
| 455 |
return;
|
| 456 |
|
| 457 |
if (newbuf == NULL)
|
| 458 |
return;
|
| 459 |
|
| 460 |
if (bytes % block_size) {
|
| 461 |
char tmp[80];
|
| 462 |
UTIL_get_lang_msg("MSG_BLOWFISH_DECRYPT_ERROR1", pvar,
|
| 463 |
"Blowfish decrypt error(1): bytes %d (%d)");
|
| 464 |
_snprintf_s(tmp, sizeof(tmp), _TRUNCATE, pvar->ts->UIMsg, bytes, block_size);
|
| 465 |
notify_fatal_error(pvar, tmp);
|
| 466 |
goto error;
|
| 467 |
}
|
| 468 |
|
| 469 |
if (EVP_Cipher(&pvar->evpcip[MODE_IN], newbuf, buf, bytes) == 0) {
|
| 470 |
UTIL_get_lang_msg("MSG_BLOWFISH_DECRYPT_ERROR2", pvar,
|
| 471 |
"Blowfish decrypt error(2)");
|
| 472 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 473 |
goto error;
|
| 474 |
|
| 475 |
} else {
|
| 476 |
memcpy(buf, newbuf, bytes);
|
| 477 |
|
| 478 |
}
|
| 479 |
|
| 480 |
error:
|
| 481 |
free(newbuf);
|
| 482 |
}
|
| 483 |
|
| 484 |
|
| 485 |
|
| 486 |
static void c3DES_encrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 487 |
int bytes)
|
| 488 |
{
|
| 489 |
Cipher3DESState FAR *encryptstate = &pvar->crypt_state.enc.c3DES;
|
| 490 |
|
| 491 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 492 |
&encryptstate->k1, &encryptstate->ivec1, DES_ENCRYPT);
|
| 493 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 494 |
&encryptstate->k2, &encryptstate->ivec2, DES_DECRYPT);
|
| 495 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 496 |
&encryptstate->k3, &encryptstate->ivec3, DES_ENCRYPT);
|
| 497 |
}
|
| 498 |
|
| 499 |
static void c3DES_decrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 500 |
int bytes)
|
| 501 |
{
|
| 502 |
Cipher3DESState FAR *decryptstate = &pvar->crypt_state.dec.c3DES;
|
| 503 |
|
| 504 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 505 |
&decryptstate->k3, &decryptstate->ivec3, DES_DECRYPT);
|
| 506 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 507 |
&decryptstate->k2, &decryptstate->ivec2, DES_ENCRYPT);
|
| 508 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 509 |
&decryptstate->k1, &decryptstate->ivec1, DES_DECRYPT);
|
| 510 |
}
|
| 511 |
|
| 512 |
static void cDES_encrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 513 |
int bytes)
|
| 514 |
{
|
| 515 |
CipherDESState FAR *encryptstate = &pvar->crypt_state.enc.cDES;
|
| 516 |
|
| 517 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 518 |
&encryptstate->k, &encryptstate->ivec, DES_ENCRYPT);
|
| 519 |
}
|
| 520 |
|
| 521 |
static void cDES_decrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 522 |
int bytes)
|
| 523 |
{
|
| 524 |
CipherDESState FAR *decryptstate = &pvar->crypt_state.dec.cDES;
|
| 525 |
|
| 526 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 527 |
&decryptstate->k, &decryptstate->ivec, DES_DECRYPT);
|
| 528 |
}
|
| 529 |
|
| 530 |
static void cIDEA_encrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 531 |
int bytes)
|
| 532 |
{
|
| 533 |
CipherIDEAState FAR *encryptstate = &pvar->crypt_state.enc.cIDEA;
|
| 534 |
int num = 0;
|
| 535 |
|
| 536 |
idea_cfb64_encrypt(buf, buf, bytes, &encryptstate->k,
|
| 537 |
encryptstate->ivec, &num, IDEA_ENCRYPT);
|
| 538 |
}
|
| 539 |
|
| 540 |
static void cIDEA_decrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 541 |
int bytes)
|
| 542 |
{
|
| 543 |
CipherIDEAState FAR *decryptstate = &pvar->crypt_state.dec.cIDEA;
|
| 544 |
int num = 0;
|
| 545 |
|
| 546 |
idea_cfb64_encrypt(buf, buf, bytes, &decryptstate->k,
|
| 547 |
decryptstate->ivec, &num, IDEA_DECRYPT);
|
| 548 |
}
|
| 549 |
|
| 550 |
static void flip_endianness(unsigned char FAR * cbuf, int bytes)
|
| 551 |
{
|
| 552 |
uint32 FAR *buf = (uint32 FAR *) cbuf;
|
| 553 |
int count = bytes / 4;
|
| 554 |
|
| 555 |
while (count > 0) {
|
| 556 |
uint32 w = *buf;
|
| 557 |
|
| 558 |
*buf = ((w << 24) & 0xFF000000) | ((w << 8) & 0x00FF0000)
|
| 559 |
| ((w >> 8) & 0x0000FF00) | ((w >> 24) & 0x000000FF);
|
| 560 |
count--;
|
| 561 |
buf++;
|
| 562 |
}
|
| 563 |
}
|
| 564 |
|
| 565 |
static void cBlowfish_encrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 566 |
int bytes)
|
| 567 |
{
|
| 568 |
CipherBlowfishState FAR *encryptstate =
|
| 569 |
&pvar->crypt_state.enc.cBlowfish;
|
| 570 |
|
| 571 |
flip_endianness(buf, bytes);
|
| 572 |
BF_cbc_encrypt(buf, buf, bytes, &encryptstate->k, encryptstate->ivec,
|
| 573 |
BF_ENCRYPT);
|
| 574 |
flip_endianness(buf, bytes);
|
| 575 |
}
|
| 576 |
|
| 577 |
static void cBlowfish_decrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 578 |
int bytes)
|
| 579 |
{
|
| 580 |
CipherBlowfishState FAR *decryptstate =
|
| 581 |
&pvar->crypt_state.dec.cBlowfish;
|
| 582 |
|
| 583 |
flip_endianness(buf, bytes);
|
| 584 |
BF_cbc_encrypt(buf, buf, bytes, &decryptstate->k, decryptstate->ivec,
|
| 585 |
BF_DECRYPT);
|
| 586 |
flip_endianness(buf, bytes);
|
| 587 |
}
|
| 588 |
|
| 589 |
static void cRC4_encrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 590 |
int bytes)
|
| 591 |
{
|
| 592 |
CipherRC4State FAR *encryptstate = &pvar->crypt_state.enc.cRC4;
|
| 593 |
int num = 0;
|
| 594 |
|
| 595 |
RC4(&encryptstate->k, bytes, buf, buf);
|
| 596 |
}
|
| 597 |
|
| 598 |
static void cRC4_decrypt(PTInstVar pvar, unsigned char FAR * buf,
|
| 599 |
int bytes)
|
| 600 |
{
|
| 601 |
CipherRC4State FAR *decryptstate = &pvar->crypt_state.dec.cRC4;
|
| 602 |
int num = 0;
|
| 603 |
|
| 604 |
RC4(&decryptstate->k, bytes, buf, buf);
|
| 605 |
}
|
| 606 |
|
| 607 |
void CRYPT_set_random_data(PTInstVar pvar, unsigned char FAR * buf,
|
| 608 |
int bytes)
|
| 609 |
{
|
| 610 |
RAND_bytes(buf, bytes);
|
| 611 |
}
|
| 612 |
|
| 613 |
void CRYPT_initialize_random_numbers(PTInstVar pvar)
|
| 614 |
{
|
| 615 |
RAND_screen();
|
| 616 |
}
|
| 617 |
|
| 618 |
static BIGNUM FAR *get_bignum(unsigned char FAR * bytes)
|
| 619 |
{
|
| 620 |
int bits = get_ushort16_MSBfirst(bytes);
|
| 621 |
|
| 622 |
return BN_bin2bn(bytes + 2, (bits + 7) / 8, NULL);
|
| 623 |
}
|
| 624 |
|
| 625 |
// make_key()を fingerprint 生成でも利用するので、staticを削除。(2006.3.27 yutaka)
|
| 626 |
RSA FAR *make_key(PTInstVar pvar,
|
| 627 |
int bits, unsigned char FAR * exp,
|
| 628 |
unsigned char FAR * mod)
|
| 629 |
{
|
| 630 |
RSA FAR *key = RSA_new();
|
| 631 |
|
| 632 |
if (key != NULL) {
|
| 633 |
key->e = get_bignum(exp);
|
| 634 |
key->n = get_bignum(mod);
|
| 635 |
}
|
| 636 |
|
| 637 |
if (key == NULL || key->e == NULL || key->n == NULL) {
|
| 638 |
UTIL_get_lang_msg("MSG_RSAKEY_SETUP_ERROR", pvar,
|
| 639 |
"Error setting up RSA keys");
|
| 640 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 641 |
|
| 642 |
if (key != NULL) {
|
| 643 |
if (key->e != NULL) {
|
| 644 |
BN_free(key->e);
|
| 645 |
}
|
| 646 |
if (key->n != NULL) {
|
| 647 |
BN_free(key->n);
|
| 648 |
}
|
| 649 |
RSA_free(key);
|
| 650 |
}
|
| 651 |
|
| 652 |
return NULL;
|
| 653 |
} else {
|
| 654 |
return key;
|
| 655 |
}
|
| 656 |
}
|
| 657 |
|
| 658 |
void CRYPT_set_server_cookie(PTInstVar pvar, unsigned char FAR * cookie)
|
| 659 |
{
|
| 660 |
if (SSHv1(pvar)) {
|
| 661 |
memcpy(pvar->crypt_state.server_cookie, cookie, SSH_COOKIE_LENGTH);
|
| 662 |
} else {
|
| 663 |
memcpy(pvar->crypt_state.server_cookie, cookie,
|
| 664 |
SSH2_COOKIE_LENGTH);
|
| 665 |
}
|
| 666 |
}
|
| 667 |
|
| 668 |
void CRYPT_set_client_cookie(PTInstVar pvar, unsigned char FAR * cookie)
|
| 669 |
{
|
| 670 |
if (SSHv2(pvar)) {
|
| 671 |
memcpy(pvar->crypt_state.client_cookie, cookie,
|
| 672 |
SSH2_COOKIE_LENGTH);
|
| 673 |
}
|
| 674 |
}
|
| 675 |
|
| 676 |
BOOL CRYPT_set_server_RSA_key(PTInstVar pvar,
|
| 677 |
int bits, unsigned char FAR * exp,
|
| 678 |
unsigned char FAR * mod)
|
| 679 |
{
|
| 680 |
pvar->crypt_state.server_key.RSA_key = make_key(pvar, bits, exp, mod);
|
| 681 |
|
| 682 |
return pvar->crypt_state.server_key.RSA_key != NULL;
|
| 683 |
}
|
| 684 |
|
| 685 |
BOOL CRYPT_set_host_RSA_key(PTInstVar pvar,
|
| 686 |
int bits, unsigned char FAR * exp,
|
| 687 |
unsigned char FAR * mod)
|
| 688 |
{
|
| 689 |
pvar->crypt_state.host_key.RSA_key = make_key(pvar, bits, exp, mod);
|
| 690 |
|
| 691 |
return pvar->crypt_state.host_key.RSA_key != NULL;
|
| 692 |
}
|
| 693 |
|
| 694 |
BOOL CRYPT_set_supported_ciphers(PTInstVar pvar, int sender_ciphers,
|
| 695 |
int receiver_ciphers)
|
| 696 |
{
|
| 697 |
int cipher_mask;
|
| 698 |
|
| 699 |
if (SSHv1(pvar)) {
|
| 700 |
cipher_mask = (1 << SSH_CIPHER_DES)
|
| 701 |
| (1 << SSH_CIPHER_3DES)
|
| 702 |
| (1 << SSH_CIPHER_BLOWFISH);
|
| 703 |
|
| 704 |
} else { // for SSH2(yutaka)
|
| 705 |
// SSH2がサポートするデータ通信用アルゴリズム（公開鍵交換用とは別）
|
| 706 |
cipher_mask = (1 << SSH2_CIPHER_3DES_CBC)
|
| 707 |
| (1 << SSH2_CIPHER_AES128)
|
| 708 |
| (1 << SSH2_CIPHER_BLOWFISH)
|
| 709 |
| (1 << SSH2_CIPHER_AES192)
|
| 710 |
| (1 << SSH2_CIPHER_AES256);
|
| 711 |
}
|
| 712 |
|
| 713 |
sender_ciphers &= cipher_mask;
|
| 714 |
receiver_ciphers &= cipher_mask;
|
| 715 |
pvar->crypt_state.supported_sender_ciphers = sender_ciphers;
|
| 716 |
pvar->crypt_state.supported_receiver_ciphers = receiver_ciphers;
|
| 717 |
|
| 718 |
if (sender_ciphers == 0) {
|
| 719 |
UTIL_get_lang_msg("MSG_UNAVAILABLE_CIPHERS_ERROR", pvar,
|
| 720 |
"The server does not support any of the TTSSH encryption algorithms.\n"
|
| 721 |
"A secure connection cannot be made in the TTSSH-to-server direction.\n"
|
| 722 |
"The connection will be closed.");
|
| 723 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 724 |
return FALSE;
|
| 725 |
} else if (receiver_ciphers == 0) {
|
| 726 |
UTIL_get_lang_msg("MSG_UNAVAILABLE_CIPHERS_ERROR", pvar,
|
| 727 |
"The server does not support any of the TTSSH encryption algorithms.\n"
|
| 728 |
"A secure connection cannot be made in the TTSSH-to-server direction.\n"
|
| 729 |
"The connection will be closed.");
|
| 730 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 731 |
return FALSE;
|
| 732 |
} else {
|
| 733 |
return TRUE;
|
| 734 |
}
|
| 735 |
}
|
| 736 |
|
| 737 |
int CRYPT_get_decryption_block_size(PTInstVar pvar)
|
| 738 |
{
|
| 739 |
if (SSHv1(pvar)) {
|
| 740 |
return 8;
|
| 741 |
} else {
|
| 742 |
// パケット受信時における復号アルゴリズムのブロックサイズ (2004.11.7 yutaka)
|
| 743 |
// cf. 3DES=8, AES128=16
|
| 744 |
return (pvar->ssh2_keys[MODE_IN].enc.block_size);
|
| 745 |
}
|
| 746 |
}
|
| 747 |
|
| 748 |
int CRYPT_get_encryption_block_size(PTInstVar pvar)
|
| 749 |
{
|
| 750 |
if (SSHv1(pvar)) {
|
| 751 |
return 8;
|
| 752 |
} else {
|
| 753 |
// パケット送信時における暗号アルゴリズムのブロックサイズ (2004.11.7 yutaka)
|
| 754 |
// cf. 3DES=8, AES128=16
|
| 755 |
return (pvar->ssh2_keys[MODE_OUT].enc.block_size);
|
| 756 |
}
|
| 757 |
}
|
| 758 |
|
| 759 |
int CRYPT_get_receiver_MAC_size(PTInstVar pvar)
|
| 760 |
{
|
| 761 |
struct Mac *mac;
|
| 762 |
|
| 763 |
if (SSHv1(pvar)) {
|
| 764 |
return 0;
|
| 765 |
|
| 766 |
} else { // for SSH2(yutaka)
|
| 767 |
mac = &pvar->ssh2_keys[MODE_IN].mac;
|
| 768 |
if (mac == NULL || mac->enabled == 0)
|
| 769 |
return 0;
|
| 770 |
|
| 771 |
return (pvar->ssh2_keys[MODE_IN].mac.mac_len);
|
| 772 |
}
|
| 773 |
|
| 774 |
}
|
| 775 |
|
| 776 |
// HMACの検証
|
| 777 |
// ※本関数は SSH2 でのみ使用される。
|
| 778 |
// (2004.12.17 yutaka)
|
| 779 |
BOOL CRYPT_verify_receiver_MAC(PTInstVar pvar, uint32 sequence_number,
|
| 780 |
char FAR * data, int len, char FAR * MAC)
|
| 781 |
{
|
| 782 |
HMAC_CTX c;
|
| 783 |
unsigned char m[EVP_MAX_MD_SIZE];
|
| 784 |
unsigned char b[4];
|
| 785 |
struct Mac *mac;
|
| 786 |
|
| 787 |
mac = &pvar->ssh2_keys[MODE_IN].mac;
|
| 788 |
|
| 789 |
// HMACがまだ有効でない場合は、検証OKとして返す。
|
| 790 |
if (mac == NULL || mac->enabled == 0)
|
| 791 |
return TRUE;
|
| 792 |
|
| 793 |
if (mac->key == NULL)
|
| 794 |
goto error;
|
| 795 |
|
| 796 |
if ((u_int)mac->mac_len > sizeof(m))
|
| 797 |
goto error;
|
| 798 |
|
| 799 |
HMAC_Init(&c, mac->key, mac->key_len, mac->md);
|
| 800 |
set_uint32_MSBfirst(b, sequence_number);
|
| 801 |
HMAC_Update(&c, b, sizeof(b));
|
| 802 |
HMAC_Update(&c, data, len);
|
| 803 |
HMAC_Final(&c, m, NULL);
|
| 804 |
HMAC_cleanup(&c);
|
| 805 |
|
| 806 |
if (memcmp(m, MAC, mac->mac_len)) {
|
| 807 |
goto error;
|
| 808 |
}
|
| 809 |
|
| 810 |
return TRUE;
|
| 811 |
|
| 812 |
error:
|
| 813 |
return FALSE;
|
| 814 |
}
|
| 815 |
|
| 816 |
int CRYPT_get_sender_MAC_size(PTInstVar pvar)
|
| 817 |
{
|
| 818 |
struct Mac *mac;
|
| 819 |
|
| 820 |
if (SSHv2(pvar)) { // for SSH2(yutaka)
|
| 821 |
mac = &pvar->ssh2_keys[MODE_OUT].mac;
|
| 822 |
if (mac == NULL || mac->enabled == 0)
|
| 823 |
return 0;
|
| 824 |
|
| 825 |
return (mac->mac_len);
|
| 826 |
}
|
| 827 |
|
| 828 |
return 0;
|
| 829 |
}
|
| 830 |
|
| 831 |
// for SSH2
|
| 832 |
BOOL CRYPT_build_sender_MAC(PTInstVar pvar, uint32 sequence_number,
|
| 833 |
char FAR * data, int len, char FAR * MAC)
|
| 834 |
{
|
| 835 |
HMAC_CTX c;
|
| 836 |
static u_char m[EVP_MAX_MD_SIZE];
|
| 837 |
u_char b[4];
|
| 838 |
struct Mac *mac;
|
| 839 |
|
| 840 |
if (SSHv2(pvar)) { // for SSH2(yutaka)
|
| 841 |
mac = &pvar->ssh2_keys[MODE_OUT].mac;
|
| 842 |
if (mac == NULL || mac->enabled == 0)
|
| 843 |
return FALSE;
|
| 844 |
|
| 845 |
HMAC_Init(&c, mac->key, mac->key_len, mac->md);
|
| 846 |
set_uint32_MSBfirst(b, sequence_number);
|
| 847 |
HMAC_Update(&c, b, sizeof(b));
|
| 848 |
HMAC_Update(&c, data, len);
|
| 849 |
HMAC_Final(&c, m, NULL);
|
| 850 |
HMAC_cleanup(&c);
|
| 851 |
|
| 852 |
// 20バイト分だけコピー
|
| 853 |
memcpy(MAC, m, pvar->ssh2_keys[MODE_OUT].mac.mac_len);
|
| 854 |
// memcpy(MAC, m, sizeof(m));
|
| 855 |
|
| 856 |
return TRUE;
|
| 857 |
}
|
| 858 |
|
| 859 |
return TRUE;
|
| 860 |
|
| 861 |
}
|
| 862 |
|
| 863 |
static int choose_cipher(PTInstVar pvar, int supported)
|
| 864 |
{
|
| 865 |
int i;
|
| 866 |
|
| 867 |
for (i = 0; pvar->session_settings.CipherOrder[i] != 0; i++) {
|
| 868 |
int cipher = pvar->session_settings.CipherOrder[i] - '0';
|
| 869 |
|
| 870 |
if (cipher == SSH_CIPHER_NONE) {
|
| 871 |
break;
|
| 872 |
} else if ((supported & (1 << cipher)) != 0) {
|
| 873 |
return cipher;
|
| 874 |
}
|
| 875 |
}
|
| 876 |
|
| 877 |
return SSH_CIPHER_NONE;
|
| 878 |
}
|
| 879 |
|
| 880 |
BOOL CRYPT_choose_ciphers(PTInstVar pvar)
|
| 881 |
{
|
| 882 |
if (SSHv1(pvar)) {
|
| 883 |
pvar->crypt_state.sender_cipher = choose_cipher(pvar,
|
| 884 |
pvar->crypt_state.
|
| 885 |
supported_sender_ciphers);
|
| 886 |
pvar->crypt_state.receiver_cipher =
|
| 887 |
choose_cipher(pvar, pvar->crypt_state.supported_receiver_ciphers);
|
| 888 |
|
| 889 |
} else { // SSH2(yutaka)
|
| 890 |
pvar->crypt_state.sender_cipher = pvar->ctos_cipher;
|
| 891 |
pvar->crypt_state.receiver_cipher =pvar->stoc_cipher;
|
| 892 |
|
| 893 |
}
|
| 894 |
|
| 895 |
if (pvar->crypt_state.sender_cipher == SSH_CIPHER_NONE
|
| 896 |
|| pvar->crypt_state.receiver_cipher == SSH_CIPHER_NONE) {
|
| 897 |
UTIL_get_lang_msg("MSG_CHIPHER_NONE_ERROR", pvar,
|
| 898 |
"All the encryption algorithms that this program and the server both understand have been disabled.\n"
|
| 899 |
"To communicate with this server, you will have to enable some more ciphers\n"
|
| 900 |
"in the TTSSH Setup dialog box when you run Teraterm again.\n"
|
| 901 |
"This connection will now close.");
|
| 902 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 903 |
return FALSE;
|
| 904 |
} else {
|
| 905 |
return TRUE;
|
| 906 |
}
|
| 907 |
}
|
| 908 |
|
| 909 |
int CRYPT_get_encrypted_session_key_len(PTInstVar pvar)
|
| 910 |
{
|
| 911 |
int server_key_bits =
|
| 912 |
BN_num_bits(pvar->crypt_state.server_key.RSA_key->n);
|
| 913 |
int host_key_bits = BN_num_bits(pvar->crypt_state.host_key.RSA_key->n);
|
| 914 |
int server_key_bytes = (server_key_bits + 7) / 8;
|
| 915 |
int host_key_bytes = (host_key_bits + 7) / 8;
|
| 916 |
|
| 917 |
if (server_key_bits < host_key_bits) {
|
| 918 |
return host_key_bytes;
|
| 919 |
} else {
|
| 920 |
return server_key_bytes;
|
| 921 |
}
|
| 922 |
}
|
| 923 |
|
| 924 |
int CRYPT_choose_session_key(PTInstVar pvar,
|
| 925 |
unsigned char FAR * encrypted_key_buf)
|
| 926 |
{
|
| 927 |
int server_key_bits =
|
| 928 |
BN_num_bits(pvar->crypt_state.server_key.RSA_key->n);
|
| 929 |
int host_key_bits = BN_num_bits(pvar->crypt_state.host_key.RSA_key->n);
|
| 930 |
int server_key_bytes = (server_key_bits + 7) / 8;
|
| 931 |
int host_key_bytes = (host_key_bits + 7) / 8;
|
| 932 |
int encrypted_key_bytes;
|
| 933 |
int bit_delta;
|
| 934 |
|
| 935 |
if (server_key_bits < host_key_bits) {
|
| 936 |
encrypted_key_bytes = host_key_bytes;
|
| 937 |
bit_delta = host_key_bits - server_key_bits;
|
| 938 |
} else {
|
| 939 |
encrypted_key_bytes = server_key_bytes;
|
| 940 |
bit_delta = server_key_bits - host_key_bits;
|
| 941 |
}
|
| 942 |
|
| 943 |
if (bit_delta < 128 || server_key_bits < 512 || host_key_bits < 512) {
|
| 944 |
UTIL_get_lang_msg("MSG_RASKEY_TOOWEAK_ERROR", pvar,
|
| 945 |
"Server RSA keys are too weak. A secure connection cannot be established.");
|
| 946 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 947 |
return 0;
|
| 948 |
} else {
|
| 949 |
/* following Goldberg's code, I'm using MD5(servkey->n || hostkey->n || cookie)
|
| 950 |
for the session ID, rather than the one specified in the RFC */
|
| 951 |
int session_buf_len = server_key_bytes + host_key_bytes + 8;
|
| 952 |
char FAR *session_buf = (char FAR *) malloc(session_buf_len);
|
| 953 |
char session_id[16];
|
| 954 |
int i;
|
| 955 |
|
| 956 |
BN_bn2bin(pvar->crypt_state.host_key.RSA_key->n, session_buf);
|
| 957 |
BN_bn2bin(pvar->crypt_state.server_key.RSA_key->n,
|
| 958 |
session_buf + host_key_bytes);
|
| 959 |
memcpy(session_buf + server_key_bytes + host_key_bytes,
|
| 960 |
pvar->crypt_state.server_cookie, 8);
|
| 961 |
MD5(session_buf, session_buf_len, session_id);
|
| 962 |
|
| 963 |
free(session_buf);
|
| 964 |
|
| 965 |
RAND_bytes(pvar->crypt_state.sender_cipher_key,
|
| 966 |
SSH_SESSION_KEY_LENGTH);
|
| 967 |
memcpy(pvar->crypt_state.receiver_cipher_key,
|
| 968 |
pvar->crypt_state.sender_cipher_key,
|
| 969 |
SSH_SESSION_KEY_LENGTH);
|
| 970 |
|
| 971 |
memcpy(encrypted_key_buf + encrypted_key_bytes -
|
| 972 |
SSH_SESSION_KEY_LENGTH, pvar->crypt_state.sender_cipher_key,
|
| 973 |
SSH_SESSION_KEY_LENGTH);
|
| 974 |
for (i = 0; i < sizeof(session_id); i++) {
|
| 975 |
encrypted_key_buf[encrypted_key_bytes -
|
| 976 |
SSH_SESSION_KEY_LENGTH + i]
|
| 977 |
^= session_id[i];
|
| 978 |
}
|
| 979 |
|
| 980 |
if (host_key_bits > server_key_bits) {
|
| 981 |
if (RSA_public_encrypt(SSH_SESSION_KEY_LENGTH,
|
| 982 |
encrypted_key_buf +
|
| 983 |
encrypted_key_bytes -
|
| 984 |
SSH_SESSION_KEY_LENGTH,
|
| 985 |
encrypted_key_buf +
|
| 986 |
encrypted_key_bytes - server_key_bytes,
|
| 987 |
pvar->crypt_state.server_key.RSA_key,
|
| 988 |
RSA_PKCS1_PADDING) < 0)
|
| 989 |
return 0;
|
| 990 |
|
| 991 |
if (RSA_public_encrypt(server_key_bytes,
|
| 992 |
encrypted_key_buf +
|
| 993 |
encrypted_key_bytes - server_key_bytes,
|
| 994 |
encrypted_key_buf,
|
| 995 |
pvar->crypt_state.host_key.RSA_key,
|
| 996 |
RSA_PKCS1_PADDING) < 0)
|
| 997 |
return 0;
|
| 998 |
} else {
|
| 999 |
if (RSA_public_encrypt(SSH_SESSION_KEY_LENGTH,
|
| 1000 |
encrypted_key_buf +
|
| 1001 |
encrypted_key_bytes -
|
| 1002 |
SSH_SESSION_KEY_LENGTH,
|
| 1003 |
encrypted_key_buf +
|
| 1004 |
encrypted_key_bytes - host_key_bytes,
|
| 1005 |
pvar->crypt_state.host_key.RSA_key,
|
| 1006 |
RSA_PKCS1_PADDING) < 0)
|
| 1007 |
return 0;
|
| 1008 |
|
| 1009 |
if (RSA_public_encrypt(host_key_bytes,
|
| 1010 |
encrypted_key_buf +
|
| 1011 |
encrypted_key_bytes - host_key_bytes,
|
| 1012 |
encrypted_key_buf,
|
| 1013 |
pvar->crypt_state.server_key.RSA_key,
|
| 1014 |
RSA_PKCS1_PADDING) < 0)
|
| 1015 |
return 0;
|
| 1016 |
}
|
| 1017 |
}
|
| 1018 |
|
| 1019 |
return 1;
|
| 1020 |
}
|
| 1021 |
|
| 1022 |
int CRYPT_generate_RSA_challenge_response(PTInstVar pvar,
|
| 1023 |
unsigned char FAR * challenge,
|
| 1024 |
int challenge_len,
|
| 1025 |
unsigned char FAR * response)
|
| 1026 |
{
|
| 1027 |
int server_key_bits =
|
| 1028 |
BN_num_bits(pvar->crypt_state.server_key.RSA_key->n);
|
| 1029 |
int host_key_bits = BN_num_bits(pvar->crypt_state.host_key.RSA_key->n);
|
| 1030 |
int server_key_bytes = (server_key_bits + 7) / 8;
|
| 1031 |
int host_key_bytes = (host_key_bits + 7) / 8;
|
| 1032 |
int session_buf_len = server_key_bytes + host_key_bytes + 8;
|
| 1033 |
char FAR *session_buf = (char FAR *) malloc(session_buf_len);
|
| 1034 |
char decrypted_challenge[48];
|
| 1035 |
int decrypted_challenge_len;
|
| 1036 |
|
| 1037 |
decrypted_challenge_len =
|
| 1038 |
RSA_private_decrypt(challenge_len, challenge, challenge,
|
| 1039 |
AUTH_get_cur_cred(pvar)->key_pair->RSA_key,
|
| 1040 |
RSA_PKCS1_PADDING);
|
| 1041 |
if (decrypted_challenge_len < 0) {
|
| 1042 |
free(session_buf);
|
| 1043 |
return 0;
|
| 1044 |
}
|
| 1045 |
if (decrypted_challenge_len >= SSH_RSA_CHALLENGE_LENGTH) {
|
| 1046 |
memcpy(decrypted_challenge,
|
| 1047 |
challenge + decrypted_challenge_len -
|
| 1048 |
SSH_RSA_CHALLENGE_LENGTH, SSH_RSA_CHALLENGE_LENGTH);
|
| 1049 |
} else {
|
| 1050 |
memset(decrypted_challenge, 0,
|
| 1051 |
SSH_RSA_CHALLENGE_LENGTH - decrypted_challenge_len);
|
| 1052 |
memcpy(decrypted_challenge + SSH_RSA_CHALLENGE_LENGTH -
|
| 1053 |
decrypted_challenge_len, challenge,
|
| 1054 |
decrypted_challenge_len);
|
| 1055 |
}
|
| 1056 |
|
| 1057 |
BN_bn2bin(pvar->crypt_state.host_key.RSA_key->n, session_buf);
|
| 1058 |
BN_bn2bin(pvar->crypt_state.server_key.RSA_key->n,
|
| 1059 |
session_buf + host_key_bytes);
|
| 1060 |
memcpy(session_buf + server_key_bytes + host_key_bytes,
|
| 1061 |
pvar->crypt_state.server_cookie, 8);
|
| 1062 |
MD5(session_buf, session_buf_len, decrypted_challenge + 32);
|
| 1063 |
|
| 1064 |
free(session_buf);
|
| 1065 |
|
| 1066 |
MD5(decrypted_challenge, 48, response);
|
| 1067 |
|
| 1068 |
return 1;
|
| 1069 |
}
|
| 1070 |
|
| 1071 |
static void c3DES_init(char FAR * session_key, Cipher3DESState FAR * state)
|
| 1072 |
{
|
| 1073 |
DES_set_key((const_DES_cblock FAR *) session_key, &state->k1);
|
| 1074 |
DES_set_key((const_DES_cblock FAR *) (session_key + 8), &state->k2);
|
| 1075 |
DES_set_key((const_DES_cblock FAR *) (session_key + 16), &state->k3);
|
| 1076 |
memset(state->ivec1, 0, 8);
|
| 1077 |
memset(state->ivec2, 0, 8);
|
| 1078 |
memset(state->ivec3, 0, 8);
|
| 1079 |
}
|
| 1080 |
|
| 1081 |
static void cDES_init(char FAR * session_key, CipherDESState FAR * state)
|
| 1082 |
{
|
| 1083 |
DES_set_key((const_des_cblock FAR *) session_key, &state->k);
|
| 1084 |
memset(state->ivec, 0, 8);
|
| 1085 |
}
|
| 1086 |
|
| 1087 |
static void cIDEA_init(char FAR * session_key, CipherIDEAState FAR * state)
|
| 1088 |
{
|
| 1089 |
idea_set_encrypt_key(session_key, &state->k);
|
| 1090 |
memset(state->ivec, 0, 8);
|
| 1091 |
}
|
| 1092 |
|
| 1093 |
static void cBlowfish_init(char FAR * session_key,
|
| 1094 |
CipherBlowfishState FAR * state)
|
| 1095 |
{
|
| 1096 |
BF_set_key(&state->k, 32, session_key);
|
| 1097 |
memset(state->ivec, 0, 8);
|
| 1098 |
}
|
| 1099 |
|
| 1100 |
|
| 1101 |
//
|
| 1102 |
// SSH2用アルゴリズムの初期化
|
| 1103 |
//
|
| 1104 |
// for SSH2(yutaka)
|
| 1105 |
//
|
| 1106 |
void cipher_init_SSH2(EVP_CIPHER_CTX *evp,
|
| 1107 |
const u_char *key, u_int keylen,
|
| 1108 |
const u_char *iv, u_int ivlen,
|
| 1109 |
int encrypt,
|
| 1110 |
const EVP_CIPHER *(*func)(void),
|
| 1111 |
PTInstVar pvar)
|
| 1112 |
{
|
| 1113 |
EVP_CIPHER *type;
|
| 1114 |
int klen;
|
| 1115 |
char tmp[80];
|
| 1116 |
|
| 1117 |
type = (EVP_CIPHER *)func();
|
| 1118 |
|
| 1119 |
EVP_CIPHER_CTX_init(evp);
|
| 1120 |
if (EVP_CipherInit(evp, type, NULL, (u_char *)iv, (encrypt == CIPHER_ENCRYPT)) == 0) {
|
| 1121 |
UTIL_get_lang_msg("MSG_CIPHER_INIT_ERROR", pvar,
|
| 1122 |
"Cipher initialize error(%d)");
|
| 1123 |
_snprintf_s(tmp, sizeof(tmp), _TRUNCATE, pvar->ts->UIMsg, 1);
|
| 1124 |
notify_fatal_error(pvar, tmp);
|
| 1125 |
return;
|
| 1126 |
}
|
| 1127 |
|
| 1128 |
klen = EVP_CIPHER_CTX_key_length(evp);
|
| 1129 |
if (klen > 0 && keylen != klen) {
|
| 1130 |
if (EVP_CIPHER_CTX_set_key_length(evp, keylen) == 0) {
|
| 1131 |
UTIL_get_lang_msg("MSG_CIPHER_INIT_ERROR", pvar,
|
| 1132 |
"Cipher initialize error(%d)");
|
| 1133 |
_snprintf_s(tmp, sizeof(tmp), _TRUNCATE, pvar->ts->UIMsg, 2);
|
| 1134 |
notify_fatal_error(pvar, tmp);
|
| 1135 |
return;
|
| 1136 |
}
|
| 1137 |
}
|
| 1138 |
if (EVP_CipherInit(evp, NULL, (u_char *)key, NULL, -1) == 0) {
|
| 1139 |
UTIL_get_lang_msg("MSG_CIPHER_INIT_ERROR", pvar,
|
| 1140 |
"Cipher initialize error(%d)");
|
| 1141 |
_snprintf_s(tmp, sizeof(tmp), _TRUNCATE, pvar->ts->UIMsg, 3);
|
| 1142 |
notify_fatal_error(pvar, tmp);
|
| 1143 |
return;
|
| 1144 |
}
|
| 1145 |
}
|
| 1146 |
|
| 1147 |
|
| 1148 |
BOOL CRYPT_start_encryption(PTInstVar pvar, int sender_flag, int receiver_flag)
|
| 1149 |
{
|
| 1150 |
char FAR *encryption_key = pvar->crypt_state.sender_cipher_key;
|
| 1151 |
char FAR *decryption_key = pvar->crypt_state.receiver_cipher_key;
|
| 1152 |
BOOL isOK = TRUE;
|
| 1153 |
|
| 1154 |
if (sender_flag) {
|
| 1155 |
switch (pvar->crypt_state.sender_cipher) {
|
| 1156 |
// for SSH2(yutaka)
|
| 1157 |
case SSH2_CIPHER_3DES_CBC:
|
| 1158 |
{
|
| 1159 |
struct Enc *enc;
|
| 1160 |
|
| 1161 |
enc = &pvar->ssh2_keys[MODE_OUT].enc;
|
| 1162 |
cipher_init_SSH2(&pvar->evpcip[MODE_OUT],
|
| 1163 |
enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher),
|
| 1164 |
enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher),
|
| 1165 |
CIPHER_ENCRYPT,
|
| 1166 |
get_cipher_EVP_CIPHER(pvar->crypt_state.sender_cipher),
|
| 1167 |
pvar);
|
| 1168 |
|
| 1169 |
//debug_print(10, enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher));
|
| 1170 |
//debug_print(11, enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher));
|
| 1171 |
|
| 1172 |
pvar->crypt_state.encrypt = c3DES_CBC_encrypt;
|
| 1173 |
break;
|
| 1174 |
}
|
| 1175 |
|
| 1176 |
// for SSH2(yutaka)
|
| 1177 |
case SSH2_CIPHER_AES128:
|
| 1178 |
case SSH2_CIPHER_AES192:
|
| 1179 |
case SSH2_CIPHER_AES256:
|
| 1180 |
{
|
| 1181 |
struct Enc *enc;
|
| 1182 |
|
| 1183 |
enc = &pvar->ssh2_keys[MODE_OUT].enc;
|
| 1184 |
cipher_init_SSH2(&pvar->evpcip[MODE_OUT],
|
| 1185 |
enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher),
|
| 1186 |
enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher),
|
| 1187 |
CIPHER_ENCRYPT,
|
| 1188 |
get_cipher_EVP_CIPHER(pvar->crypt_state.sender_cipher),
|
| 1189 |
pvar);
|
| 1190 |
|
| 1191 |
//debug_print(10, enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher));
|
| 1192 |
//debug_print(11, enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher));
|
| 1193 |
|
| 1194 |
pvar->crypt_state.encrypt = cAES128_encrypt;
|
| 1195 |
break;
|
| 1196 |
}
|
| 1197 |
|
| 1198 |
case SSH2_CIPHER_BLOWFISH:
|
| 1199 |
{
|
| 1200 |
struct Enc *enc;
|
| 1201 |
|
| 1202 |
enc = &pvar->ssh2_keys[MODE_OUT].enc;
|
| 1203 |
cipher_init_SSH2(&pvar->evpcip[MODE_OUT],
|
| 1204 |
enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher),
|
| 1205 |
enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher),
|
| 1206 |
CIPHER_ENCRYPT,
|
| 1207 |
get_cipher_EVP_CIPHER(pvar->crypt_state.sender_cipher),
|
| 1208 |
pvar);
|
| 1209 |
|
| 1210 |
//debug_print(10, enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher));
|
| 1211 |
//debug_print(11, enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher));
|
| 1212 |
|
| 1213 |
pvar->crypt_state.encrypt = cBlowfish_encrypt2;
|
| 1214 |
break;
|
| 1215 |
}
|
| 1216 |
|
| 1217 |
case SSH_CIPHER_3DES:{
|
| 1218 |
c3DES_init(encryption_key, &pvar->crypt_state.enc.c3DES);
|
| 1219 |
pvar->crypt_state.encrypt = c3DES_encrypt;
|
| 1220 |
break;
|
| 1221 |
}
|
| 1222 |
case SSH_CIPHER_IDEA:{
|
| 1223 |
cIDEA_init(encryption_key, &pvar->crypt_state.enc.cIDEA);
|
| 1224 |
pvar->crypt_state.encrypt = cIDEA_encrypt;
|
| 1225 |
break;
|
| 1226 |
}
|
| 1227 |
case SSH_CIPHER_DES:{
|
| 1228 |
cDES_init(encryption_key, &pvar->crypt_state.enc.cDES);
|
| 1229 |
pvar->crypt_state.encrypt = cDES_encrypt;
|
| 1230 |
break;
|
| 1231 |
}
|
| 1232 |
case SSH_CIPHER_RC4:{
|
| 1233 |
RC4_set_key(&pvar->crypt_state.enc.cRC4.k, 16,
|
| 1234 |
encryption_key + 16);
|
| 1235 |
pvar->crypt_state.encrypt = cRC4_encrypt;
|
| 1236 |
break;
|
| 1237 |
}
|
| 1238 |
case SSH_CIPHER_BLOWFISH:{
|
| 1239 |
cBlowfish_init(encryption_key,
|
| 1240 |
&pvar->crypt_state.enc.cBlowfish);
|
| 1241 |
pvar->crypt_state.encrypt = cBlowfish_encrypt;
|
| 1242 |
break;
|
| 1243 |
}
|
| 1244 |
default:
|
| 1245 |
isOK = FALSE;
|
| 1246 |
}
|
| 1247 |
}
|
| 1248 |
|
| 1249 |
|
| 1250 |
if (receiver_flag) {
|
| 1251 |
switch (pvar->crypt_state.receiver_cipher) {
|
| 1252 |
// for SSH2(yutaka)
|
| 1253 |
case SSH2_CIPHER_3DES_CBC:
|
| 1254 |
{
|
| 1255 |
struct Enc *enc;
|
| 1256 |
|
| 1257 |
enc = &pvar->ssh2_keys[MODE_IN].enc;
|
| 1258 |
cipher_init_SSH2(&pvar->evpcip[MODE_IN],
|
| 1259 |
enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher),
|
| 1260 |
enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher),
|
| 1261 |
CIPHER_DECRYPT,
|
| 1262 |
get_cipher_EVP_CIPHER(pvar->crypt_state.sender_cipher),
|
| 1263 |
pvar);
|
| 1264 |
|
| 1265 |
//debug_print(12, enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher));
|
| 1266 |
//debug_print(13, enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher));
|
| 1267 |
|
| 1268 |
pvar->crypt_state.decrypt = c3DES_CBC_decrypt;
|
| 1269 |
break;
|
| 1270 |
}
|
| 1271 |
|
| 1272 |
// for SSH2(yutaka)
|
| 1273 |
case SSH2_CIPHER_AES128:
|
| 1274 |
case SSH2_CIPHER_AES192:
|
| 1275 |
case SSH2_CIPHER_AES256:
|
| 1276 |
{
|
| 1277 |
struct Enc *enc;
|
| 1278 |
|
| 1279 |
enc = &pvar->ssh2_keys[MODE_IN].enc;
|
| 1280 |
cipher_init_SSH2(&pvar->evpcip[MODE_IN],
|
| 1281 |
enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher),
|
| 1282 |
enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher),
|
| 1283 |
CIPHER_DECRYPT,
|
| 1284 |
get_cipher_EVP_CIPHER(pvar->crypt_state.sender_cipher),
|
| 1285 |
pvar);
|
| 1286 |
|
| 1287 |
//debug_print(12, enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher));
|
| 1288 |
//debug_print(13, enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher));
|
| 1289 |
|
| 1290 |
pvar->crypt_state.decrypt = cAES128_decrypt;
|
| 1291 |
break;
|
| 1292 |
}
|
| 1293 |
|
| 1294 |
case SSH2_CIPHER_BLOWFISH:
|
| 1295 |
{
|
| 1296 |
struct Enc *enc;
|
| 1297 |
|
| 1298 |
enc = &pvar->ssh2_keys[MODE_IN].enc;
|
| 1299 |
cipher_init_SSH2(&pvar->evpcip[MODE_IN],
|
| 1300 |
enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher),
|
| 1301 |
enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher),
|
| 1302 |
CIPHER_DECRYPT,
|
| 1303 |
get_cipher_EVP_CIPHER(pvar->crypt_state.sender_cipher),
|
| 1304 |
pvar);
|
| 1305 |
|
| 1306 |
//debug_print(12, enc->key, get_cipher_key_len(pvar->crypt_state.sender_cipher));
|
| 1307 |
//debug_print(13, enc->iv, get_cipher_block_size(pvar->crypt_state.sender_cipher));
|
| 1308 |
|
| 1309 |
pvar->crypt_state.decrypt = cBlowfish_decrypt2;
|
| 1310 |
break;
|
| 1311 |
}
|
| 1312 |
|
| 1313 |
case SSH_CIPHER_3DES:{
|
| 1314 |
c3DES_init(decryption_key, &pvar->crypt_state.dec.c3DES);
|
| 1315 |
pvar->crypt_state.decrypt = c3DES_decrypt;
|
| 1316 |
break;
|
| 1317 |
}
|
| 1318 |
case SSH_CIPHER_IDEA:{
|
| 1319 |
cIDEA_init(decryption_key, &pvar->crypt_state.dec.cIDEA);
|
| 1320 |
pvar->crypt_state.decrypt = cIDEA_decrypt;
|
| 1321 |
break;
|
| 1322 |
}
|
| 1323 |
case SSH_CIPHER_DES:{
|
| 1324 |
cDES_init(decryption_key, &pvar->crypt_state.dec.cDES);
|
| 1325 |
pvar->crypt_state.decrypt = cDES_decrypt;
|
| 1326 |
break;
|
| 1327 |
}
|
| 1328 |
case SSH_CIPHER_RC4:{
|
| 1329 |
RC4_set_key(&pvar->crypt_state.dec.cRC4.k, 16, decryption_key);
|
| 1330 |
pvar->crypt_state.decrypt = cRC4_decrypt;
|
| 1331 |
break;
|
| 1332 |
}
|
| 1333 |
case SSH_CIPHER_BLOWFISH:{
|
| 1334 |
cBlowfish_init(decryption_key,
|
| 1335 |
&pvar->crypt_state.dec.cBlowfish);
|
| 1336 |
pvar->crypt_state.decrypt = cBlowfish_decrypt;
|
| 1337 |
break;
|
| 1338 |
}
|
| 1339 |
default:
|
| 1340 |
isOK = FALSE;
|
| 1341 |
}
|
| 1342 |
}
|
| 1343 |
|
| 1344 |
|
| 1345 |
if (!isOK) {
|
| 1346 |
UTIL_get_lang_msg("MSG_CHPHER_NOTSELECTED_ERROR", pvar,
|
| 1347 |
"No cipher selected!");
|
| 1348 |
notify_fatal_error(pvar, pvar->ts->UIMsg);
|
| 1349 |
return FALSE;
|
| 1350 |
} else {
|
| 1351 |
memset(encryption_key, 0, CRYPT_KEY_LENGTH);
|
| 1352 |
memset(decryption_key, 0, CRYPT_KEY_LENGTH);
|
| 1353 |
return TRUE;
|
| 1354 |
}
|
| 1355 |
}
|
| 1356 |
|
| 1357 |
void CRYPT_init(PTInstVar pvar)
|
| 1358 |
{
|
| 1359 |
pvar->crypt_state.encrypt = no_encrypt;
|
| 1360 |
pvar->crypt_state.decrypt = no_encrypt;
|
| 1361 |
pvar->crypt_state.sender_cipher = SSH_CIPHER_NONE;
|
| 1362 |
pvar->crypt_state.receiver_cipher = SSH_CIPHER_NONE;
|
| 1363 |
pvar->crypt_state.server_key.RSA_key = NULL;
|
| 1364 |
pvar->crypt_state.host_key.RSA_key = NULL;
|
| 1365 |
|
| 1366 |
pvar->crypt_state.detect_attack_statics.h = NULL;
|
| 1367 |
pvar->crypt_state.detect_attack_statics.n =
|
| 1368 |
HASH_MINSIZE / HASH_ENTRYSIZE;
|
| 1369 |
}
|
| 1370 |
|
| 1371 |
static char FAR *get_cipher_name(int cipher)
|
| 1372 |
{
|
| 1373 |
switch (cipher) {
|
| 1374 |
case SSH_CIPHER_NONE:
|
| 1375 |
return "None";
|
| 1376 |
case SSH_CIPHER_3DES:
|
| 1377 |
return "3DES (168 key bits)";
|
| 1378 |
case SSH_CIPHER_DES:
|
| 1379 |
return "DES (56 key bits)";
|
| 1380 |
case SSH_CIPHER_IDEA:
|
| 1381 |
return "IDEA (128 key bits)";
|
| 1382 |
case SSH_CIPHER_RC4:
|
| 1383 |
return "RC4 (128 key bits)";
|
| 1384 |
case SSH_CIPHER_BLOWFISH:
|
| 1385 |
return "Blowfish (256 key bits)";
|
| 1386 |
|
| 1387 |
// SSH2
|
| 1388 |
case SSH2_CIPHER_3DES_CBC:
|
| 1389 |
return "3DES-CBC";
|
| 1390 |
case SSH2_CIPHER_AES128:
|
| 1391 |
return "AES128";
|
| 1392 |
case SSH2_CIPHER_AES192:
|
| 1393 |
return "AES192";
|
| 1394 |
case SSH2_CIPHER_AES256:
|
| 1395 |
return "AES256";
|
| 1396 |
case SSH2_CIPHER_BLOWFISH:
|
| 1397 |
return "Blowfish";
|
| 1398 |
|
| 1399 |
default:
|
| 1400 |
return "Unknown";
|
| 1401 |
}
|
| 1402 |
}
|
| 1403 |
|
| 1404 |
void CRYPT_get_cipher_info(PTInstVar pvar, char FAR * dest, int len)
|
| 1405 |
{
|
| 1406 |
UTIL_get_lang_msg("DLG_ABOUT_CIPHER_INFO", pvar,
|
| 1407 |
"%s to server, %s from server");
|
| 1408 |
_snprintf_s(dest, len, _TRUNCATE, pvar->ts->UIMsg,
|
| 1409 |
get_cipher_name(pvar->crypt_state.sender_cipher),
|
| 1410 |
get_cipher_name(pvar->crypt_state.receiver_cipher));
|
| 1411 |
}
|
| 1412 |
|
| 1413 |
void CRYPT_get_server_key_info(PTInstVar pvar, char FAR * dest, int len)
|
| 1414 |
{
|
| 1415 |
if (SSHv1(pvar)) {
|
| 1416 |
if (pvar->crypt_state.server_key.RSA_key == NULL
|
| 1417 |
|| pvar->crypt_state.host_key.RSA_key == NULL) {
|
| 1418 |
UTIL_get_lang_msg("DLG_ABOUT_KEY_NONE", pvar, "None");
|
| 1419 |
strncpy_s(dest, len, pvar->ts->UIMsg, _TRUNCATE);
|
| 1420 |
} else {
|
| 1421 |
UTIL_get_lang_msg("DLG_ABOUT_KEY_INFO", pvar,
|
| 1422 |
"%d-bit server key, %d-bit host key");
|
| 1423 |
_snprintf_s(dest, len, _TRUNCATE, pvar->ts->UIMsg,
|
| 1424 |
BN_num_bits(pvar->crypt_state.server_key.RSA_key->n),
|
| 1425 |
BN_num_bits(pvar->crypt_state.host_key.RSA_key->n));
|
| 1426 |
}
|
| 1427 |
} else { // SSH2
|
| 1428 |
UTIL_get_lang_msg("DLG_ABOUT_KEY_INFO", pvar,
|
| 1429 |
"%d-bit server key, %d-bit host key");
|
| 1430 |
_snprintf_s(dest, len, _TRUNCATE, pvar->ts->UIMsg,
|
| 1431 |
pvar->server_key_bits,
|
| 1432 |
pvar->client_key_bits);
|
| 1433 |
}
|
| 1434 |
}
|
| 1435 |
|
| 1436 |
static void destroy_public_key(CRYPTPublicKey FAR * key)
|
| 1437 |
{
|
| 1438 |
if (key->RSA_key != NULL) {
|
| 1439 |
RSA_free(key->RSA_key);
|
| 1440 |
key->RSA_key = NULL;
|
| 1441 |
}
|
| 1442 |
}
|
| 1443 |
|
| 1444 |
void CRYPT_free_public_key(CRYPTPublicKey FAR * key)
|
| 1445 |
{
|
| 1446 |
destroy_public_key(key);
|
| 1447 |
free(key);
|
| 1448 |
}
|
| 1449 |
|
| 1450 |
void CRYPT_end(PTInstVar pvar)
|
| 1451 |
{
|
| 1452 |
destroy_public_key(&pvar->crypt_state.host_key);
|
| 1453 |
destroy_public_key(&pvar->crypt_state.server_key);
|
| 1454 |
|
| 1455 |
if (pvar->crypt_state.detect_attack_statics.h != NULL) {
|
| 1456 |
memset(pvar->crypt_state.detect_attack_statics.h, 0,
|
| 1457 |
pvar->crypt_state.detect_attack_statics.n * HASH_ENTRYSIZE);
|
| 1458 |
free(pvar->crypt_state.detect_attack_statics.h);
|
| 1459 |
}
|
| 1460 |
|
| 1461 |
memset(pvar->crypt_state.sender_cipher_key, 0,
|
| 1462 |
sizeof(pvar->crypt_state.sender_cipher_key));
|
| 1463 |
memset(pvar->crypt_state.receiver_cipher_key, 0,
|
| 1464 |
sizeof(pvar->crypt_state.receiver_cipher_key));
|
| 1465 |
memset(pvar->crypt_state.server_cookie, 0,
|
| 1466 |
sizeof(pvar->crypt_state.server_cookie));
|
| 1467 |
memset(pvar->crypt_state.client_cookie, 0,
|
| 1468 |
sizeof(pvar->crypt_state.client_cookie));
|
| 1469 |
memset(&pvar->crypt_state.enc, 0, sizeof(pvar->crypt_state.enc));
|
| 1470 |
memset(&pvar->crypt_state.dec, 0, sizeof(pvar->crypt_state.dec));
|
| 1471 |
}
|
| 1472 |
|
| 1473 |
int CRYPT_passphrase_decrypt(int cipher, char FAR * passphrase,
|
| 1474 |
char FAR * buf, int bytes)
|
| 1475 |
{
|
| 1476 |
unsigned char passphrase_key[16];
|
| 1477 |
|
| 1478 |
MD5(passphrase, strlen(passphrase), passphrase_key);
|
| 1479 |
|
| 1480 |
switch (cipher) {
|
| 1481 |
case SSH_CIPHER_3DES:{
|
| 1482 |
Cipher3DESState state;
|
| 1483 |
|
| 1484 |
DES_set_key((const_DES_cblock FAR *) passphrase_key,
|
| 1485 |
&state.k1);
|
| 1486 |
DES_set_key((const_DES_cblock FAR *) (passphrase_key + 8),
|
| 1487 |
&state.k2);
|
| 1488 |
DES_set_key((const_DES_cblock FAR *) passphrase_key,
|
| 1489 |
&state.k3);
|
| 1490 |
memset(state.ivec1, 0, 8);
|
| 1491 |
memset(state.ivec2, 0, 8);
|
| 1492 |
memset(state.ivec3, 0, 8);
|
| 1493 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 1494 |
&state.k3, &state.ivec3, DES_DECRYPT);
|
| 1495 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 1496 |
&state.k2, &state.ivec2, DES_ENCRYPT);
|
| 1497 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 1498 |
&state.k1, &state.ivec1, DES_DECRYPT);
|
| 1499 |
break;
|
| 1500 |
}
|
| 1501 |
|
| 1502 |
case SSH_CIPHER_IDEA:{
|
| 1503 |
CipherIDEAState state;
|
| 1504 |
int num = 0;
|
| 1505 |
|
| 1506 |
cIDEA_init(passphrase_key, &state);
|
| 1507 |
idea_cfb64_encrypt(buf, buf, bytes, &state.k, state.ivec,
|
| 1508 |
&num, IDEA_DECRYPT);
|
| 1509 |
break;
|
| 1510 |
}
|
| 1511 |
|
| 1512 |
case SSH_CIPHER_DES:{
|
| 1513 |
CipherDESState state;
|
| 1514 |
|
| 1515 |
cDES_init(passphrase_key, &state);
|
| 1516 |
DES_ncbc_encrypt(buf, buf, bytes,
|
| 1517 |
&state.k, &state.ivec, DES_DECRYPT);
|
| 1518 |
break;
|
| 1519 |
}
|
| 1520 |
|
| 1521 |
case SSH_CIPHER_RC4:{
|
| 1522 |
CipherRC4State state;
|
| 1523 |
int num = 0;
|
| 1524 |
|
| 1525 |
RC4_set_key(&state.k, 16, passphrase_key);
|
| 1526 |
RC4(&state.k, bytes, buf, buf);
|
| 1527 |
break;
|
| 1528 |
}
|
| 1529 |
|
| 1530 |
case SSH_CIPHER_BLOWFISH:{
|
| 1531 |
CipherBlowfishState state;
|
| 1532 |
|
| 1533 |
BF_set_key(&state.k, 16, passphrase_key);
|
| 1534 |
memset(state.ivec, 0, 8);
|
| 1535 |
flip_endianness(buf, bytes);
|
| 1536 |
BF_cbc_encrypt(buf, buf, bytes, &state.k, state.ivec,
|
| 1537 |
BF_DECRYPT);
|
| 1538 |
flip_endianness(buf, bytes);
|
| 1539 |
break;
|
| 1540 |
}
|
| 1541 |
|
| 1542 |
case SSH_CIPHER_NONE:
|
| 1543 |
break;
|
| 1544 |
|
| 1545 |
default:
|
| 1546 |
memset(passphrase_key, 0, sizeof(passphrase_key));
|
| 1547 |
return 0;
|
| 1548 |
}
|
| 1549 |
|
| 1550 |
memset(passphrase_key, 0, sizeof(passphrase_key));
|
| 1551 |
return 1;
|
| 1552 |
}
|
| 1553 |
|
| 1554 |
void CRYPT_free_key_pair(CRYPTKeyPair FAR * key_pair)
|
| 1555 |
{
|
| 1556 |
if (key_pair->RSA_key != NULL)
|
| 1557 |
RSA_free(key_pair->RSA_key);
|
| 1558 |
|
| 1559 |
if (key_pair->DSA_key != NULL)
|
| 1560 |
DSA_free(key_pair->DSA_key);
|
| 1561 |
|
| 1562 |
free(key_pair);
|
| 1563 |
}
|
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