| 1 |
/* |
| 2 |
Copyright (c) 1998-2001, Robert O'Callahan |
| 3 |
All rights reserved. |
| 4 |
|
| 5 |
Redistribution and use in source and binary forms, with or without modification, |
| 6 |
are permitted provided that the following conditions are met: |
| 7 |
|
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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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|
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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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|
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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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|
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND |
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 |
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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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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|
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#define WINDOWS |
| 30 |
|
| 31 |
#include "ttxssh.h" |
| 32 |
#include "util.h" |
| 33 |
|
| 34 |
#include <openssl/rand.h> |
| 35 |
#include <openssl/bn.h> |
| 36 |
#include <openssl/md5.h> |
| 37 |
#include <openssl/err.h> |
| 38 |
#include <openssl/des.h> |
| 39 |
#include <openssl/hmac.h> // for SSH2(yutaka) |
| 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 |
| 48 |
#define DEATTACK_DETECTED 1 |
| 49 |
|
| 50 |
/* |
| 51 |
* $Id: crypt.c,v 1.4 2005-07-09 05:16:06 yutakakn 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 |
| 61 |
#define HASH_ENTRYSIZE 4 |
| 62 |
#define HASH_FACTOR(x) ((x)*3/2) |
| 63 |
#define HASH_UNUSEDCHAR 0xff |
| 64 |
#define HASH_UNUSED 0xffffffff |
| 65 |
#define HASH_IV 0xfffffffe |
| 66 |
|
| 67 |
#define HASH_MINBLOCKS (7*SSH_BLOCKSIZE) |
| 68 |
|
| 69 |
/* Hash function (Input keys are cipher results) */ |
| 70 |
#define HASH(x) get_uint32(x) |
| 71 |
|
| 72 |
#define CMP(a,b) memcmp(a, b, SSH_BLOCKSIZE) |
| 73 |
|
| 74 |
|
| 75 |
|
| 76 |
static void crc_update(uint32 FAR * a, uint32 b) |
| 77 |
{ |
| 78 |
b ^= *a; |
| 79 |
*a = do_crc((unsigned char FAR *) &b, sizeof(b)); |
| 80 |
} |
| 81 |
|
| 82 |
/* check_crc |
| 83 |
detects if a block is used in a particular pattern |
| 84 |
*/ |
| 85 |
|
| 86 |
static int check_crc(unsigned char FAR * S, unsigned char FAR * buf, |
| 87 |
uint32 len, unsigned char FAR * IV) |
| 88 |
{ |
| 89 |
uint32 crc; |
| 90 |
unsigned char FAR *c; |
| 91 |
|
| 92 |
crc = 0; |
| 93 |
if (IV && !CMP(S, IV)) { |
| 94 |
crc_update(&crc, 1); |
| 95 |
crc_update(&crc, 0); |
| 96 |
} |
| 97 |
for (c = buf; c < buf + len; c += SSH_BLOCKSIZE) { |
| 98 |
if (!CMP(S, c)) { |
| 99 |
crc_update(&crc, 1); |
| 100 |
crc_update(&crc, 0); |
| 101 |
} else { |
| 102 |
crc_update(&crc, 0); |
| 103 |
crc_update(&crc, 0); |
| 104 |
} |
| 105 |
} |
| 106 |
|
| 107 |
return crc == 0; |
| 108 |
} |
| 109 |
|
| 110 |
|
| 111 |
/* |
| 112 |
detect_attack |
| 113 |
Detects a crc32 compensation attack on a packet |
| 114 |
*/ |
| 115 |
static int detect_attack(CRYPTDetectAttack FAR * statics, |
| 116 |
unsigned char FAR * buf, uint32 len, |
| 117 |
unsigned char *FAR IV) |
| 118 |
{ |
| 119 |
uint32 FAR *h = statics->h; |
| 120 |
uint32 n = statics->n; |
| 121 |
uint32 i, j; |
| 122 |
uint32 l; |
| 123 |
unsigned char FAR *c; |
| 124 |
unsigned char FAR *d; |
| 125 |
|
| 126 |
for (l = n; l < HASH_FACTOR(len / SSH_BLOCKSIZE); l = l << 2) { |
| 127 |
} |
| 128 |
|
| 129 |
if (h == NULL) { |
| 130 |
n = l; |
| 131 |
h = (uint32 FAR *) malloc(n * HASH_ENTRYSIZE); |
| 132 |
} else { |
| 133 |
if (l > n) { |
| 134 |
n = l; |
| 135 |
h = (uint32 FAR *) realloc(h, n * HASH_ENTRYSIZE); |
| 136 |
} |
| 137 |
} |
| 138 |
|
| 139 |
statics->h = h; |
| 140 |
statics->n = n; |
| 141 |
|
| 142 |
if (len <= HASH_MINBLOCKS) { |
| 143 |
for (c = buf; c < buf + len; c += SSH_BLOCKSIZE) { |
| 144 |
if (IV && (!CMP(c, IV))) { |
| 145 |
if ((check_crc(c, buf, len, IV))) |
| 146 |
return DEATTACK_DETECTED; |
| 147 |
else |
| 148 |
break; |
| 149 |
} |
| 150 |
for (d = buf; d < c; d += SSH_BLOCKSIZE) { |
| 151 |
if (!CMP(c, d)) { |
| 152 |
if ((check_crc(c, buf, len, IV))) |
| 153 |
return DEATTACK_DETECTED; |
| 154 |
else |
| 155 |
break; |
| 156 |
} |
| 157 |
} |
| 158 |
} |
| 159 |
return (DEATTACK_OK); |
| 160 |
} |
| 161 |
memset(h, HASH_UNUSEDCHAR, n * HASH_ENTRYSIZE); |
| 162 |
|
| 163 |
if (IV) { |
| 164 |
h[HASH(IV) & (n - 1)] = HASH_IV; |
| 165 |
} |
| 166 |
|
| 167 |
for (c = buf, j = 0; c < (buf + len); c += SSH_BLOCKSIZE, j++) { |
| 168 |
for (i = HASH(c) & (n - 1); h[i] != HASH_UNUSED; |
| 169 |
i = (i + 1) & (n - 1)) { |
| 170 |
if (h[i] == HASH_IV) { |
| 171 |
if (!CMP(c, IV)) { |
| 172 |
if (check_crc(c, buf, len, IV)) |
| 173 |
return DEATTACK_DETECTED; |
| 174 |
else |
| 175 |
break; |
| 176 |
} |
| 177 |
} else if (!CMP(c, buf + h[i] * SSH_BLOCKSIZE)) { |
| 178 |
if (check_crc(c, buf, len, IV)) |
| 179 |
return DEATTACK_DETECTED; |
| 180 |
else |
| 181 |
break; |
| 182 |
} |
| 183 |
} |
| 184 |
h[i] = j; |
| 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; |
| 197 |
case SSH_CIPHER_IDEA: |
| 198 |
return detect_attack(&pvar->crypt_state.detect_attack_statics, |
| 199 |
buf, bytes, |
| 200 |
pvar->crypt_state.dec.cIDEA.ivec) == |
| 201 |
DEATTACK_DETECTED; |
| 202 |
default: |
| 203 |
return detect_attack(&pvar->crypt_state.detect_attack_statics, |
| 204 |
buf, bytes, NULL) == DEATTACK_DETECTED; |
| 205 |
} |
| 206 |
} else { |
| 207 |
return FALSE; |
| 208 |
} |
| 209 |
} |
| 210 |
|
| 211 |
static void no_encrypt(PTInstVar pvar, unsigned char FAR * buf, int bytes) |
| 212 |
{ |
| 213 |
} |
| 214 |
|
| 215 |
|
| 216 |
// for SSH2(yutaka) |
| 217 |
static void cAES128_encrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 218 |
int bytes) |
| 219 |
{ |
| 220 |
// unsigned char key[AES128_KEYLEN], iv[AES128_IVLEN]; |
| 221 |
unsigned char *newbuf = malloc(bytes); |
| 222 |
int block_size = pvar->ssh2_keys[MODE_OUT].enc.block_size; |
| 223 |
|
| 224 |
// ���O�������������A�S�y�C���[�h�������������������������A0�o�C�g�������B(2004.11.7 yutaka) |
| 225 |
if (bytes == 0) |
| 226 |
return; |
| 227 |
|
| 228 |
if (newbuf == NULL) |
| 229 |
return; |
| 230 |
|
| 231 |
if (bytes % block_size) { |
| 232 |
char tmp[80]; |
| 233 |
_snprintf(tmp, sizeof(tmp), "AES128 encrypt error(1): bytes %d (%d)", bytes, block_size); |
| 234 |
notify_fatal_error(pvar, tmp); |
| 235 |
goto error; |
| 236 |
} |
| 237 |
|
| 238 |
if (EVP_Cipher(&pvar->evpcip[MODE_OUT], newbuf, buf, bytes) == 0) { |
| 239 |
// TODO: failure |
| 240 |
notify_fatal_error(pvar, "AES128 encrypt error(2)"); |
| 241 |
|
| 242 |
} else { |
| 243 |
//memcpy(key, pvar->ssh2_keys[MODE_OUT].enc.key, AES128_KEYLEN); |
| 244 |
// IV��DES���������X�V�����������A���[�J�����R�s�[���������g���B |
| 245 |
//memcpy(iv, pvar->ssh2_keys[MODE_OUT].enc.iv, AES128_IVLEN); |
| 246 |
|
| 247 |
//debug_print(50, key, 24); |
| 248 |
//debug_print(51, iv, 8); |
| 249 |
//debug_print(52, buf, bytes); |
| 250 |
//debug_print(53, newbuf, bytes); |
| 251 |
|
| 252 |
memcpy(buf, newbuf, bytes); |
| 253 |
} |
| 254 |
|
| 255 |
error: |
| 256 |
free(newbuf); |
| 257 |
} |
| 258 |
|
| 259 |
static void cAES128_decrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 260 |
int bytes) |
| 261 |
{ |
| 262 |
// unsigned char key[AES128_KEYLEN], iv[AES128_IVLEN]; |
| 263 |
unsigned char *newbuf = malloc(bytes); |
| 264 |
int block_size = pvar->ssh2_keys[MODE_IN].enc.block_size; |
| 265 |
|
| 266 |
// ���O�������������A�S�y�C���[�h�������������������������A0�o�C�g�������B(2004.11.7 yutaka) |
| 267 |
if (bytes == 0) |
| 268 |
return; |
| 269 |
|
| 270 |
if (newbuf == NULL) |
| 271 |
return; |
| 272 |
|
| 273 |
if (bytes % block_size) { |
| 274 |
char tmp[80]; |
| 275 |
_snprintf(tmp, sizeof(tmp), "AES128 decrypt error(1): bytes %d (%d)", bytes, block_size); |
| 276 |
notify_fatal_error(pvar, tmp); |
| 277 |
goto error; |
| 278 |
} |
| 279 |
|
| 280 |
if (EVP_Cipher(&pvar->evpcip[MODE_IN], newbuf, buf, bytes) == 0) { |
| 281 |
// TODO: |
| 282 |
notify_fatal_error(pvar, "AES128 decrypt error(2)"); |
| 283 |
|
| 284 |
} else { |
| 285 |
#if 0 |
| 286 |
memcpy(key, pvar->ssh2_keys[MODE_IN].enc.key, AES128_KEYLEN); |
| 287 |
// IV��DES���������X�V�����������A���[�J�����R�s�[���������g���B |
| 288 |
memcpy(iv, pvar->ssh2_keys[MODE_IN].enc.iv, AES128_IVLEN); |
| 289 |
|
| 290 |
{ |
| 291 |
static int no = 70; |
| 292 |
debug_print(no, buf, bytes); |
| 293 |
//debug_print(no, key, AES128_KEYLEN); |
| 294 |
//debug_print(10*no, iv, AES128_IVLEN); |
| 295 |
debug_print(30*no, newbuf, bytes); |
| 296 |
no++; |
| 297 |
} |
| 298 |
#endif |
| 299 |
|
| 300 |
memcpy(buf, newbuf, bytes); |
| 301 |
} |
| 302 |
|
| 303 |
error:; |
| 304 |
free(newbuf); |
| 305 |
} |
| 306 |
|
| 307 |
|
| 308 |
|
| 309 |
// for SSH2(yutaka) |
| 310 |
static void c3DES_CBC_encrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 311 |
int bytes) |
| 312 |
{ |
| 313 |
unsigned char key[24], iv[8]; |
| 314 |
unsigned char *newbuf = malloc(bytes); |
| 315 |
|
| 316 |
if (newbuf == NULL) |
| 317 |
return; |
| 318 |
|
| 319 |
#if 1 |
| 320 |
|
| 321 |
if (EVP_Cipher(&pvar->evpcip[MODE_OUT], newbuf, buf, bytes) == 0) { |
| 322 |
// TODO: failure |
| 323 |
} else { |
| 324 |
memcpy(key, pvar->ssh2_keys[MODE_OUT].enc.key, 24); |
| 325 |
// IV��DES���������X�V�����������A���[�J�����R�s�[���������g���B |
| 326 |
memcpy(iv, pvar->ssh2_keys[MODE_OUT].enc.iv, 8); |
| 327 |
|
| 328 |
//debug_print(50, key, 24); |
| 329 |
//debug_print(51, iv, 8); |
| 330 |
//debug_print(52, buf, bytes); |
| 331 |
//debug_print(53, newbuf, bytes); |
| 332 |
|
| 333 |
memcpy(buf, newbuf, bytes); |
| 334 |
} |
| 335 |
free(newbuf); |
| 336 |
#else |
| 337 |
|
| 338 |
memcpy(key, pvar->ssh2_keys[MODE_OUT].enc.key, 24); |
| 339 |
// IV��DES���������X�V�����������A���[�J�����R�s�[���������g���B |
| 340 |
memcpy(iv, pvar->ssh2_keys[MODE_OUT].enc.iv, 8); |
| 341 |
|
| 342 |
//debug_print(50, key, 24); |
| 343 |
//debug_print(51, iv, 8); |
| 344 |
//debug_print(52, buf, bytes); |
| 345 |
|
| 346 |
#if 0 |
| 347 |
DES_ede3_cbc_encrypt( |
| 348 |
buf, newbuf, bytes, |
| 349 |
(DES_key_schedule *)&key[0], |
| 350 |
(DES_key_schedule *)&key[8], |
| 351 |
(DES_key_schedule *)&key[16], |
| 352 |
(DES_cblock *)iv, |
| 353 |
DES_ENCRYPT); |
| 354 |
#else |
| 355 |
DES_ncbc_encrypt(buf, newbuf, bytes, (DES_key_schedule *)&key[0], (DES_cblock *)iv, DES_ENCRYPT); |
| 356 |
DES_ncbc_encrypt(buf, newbuf, bytes, (DES_key_schedule *)&key[8], (DES_cblock *)iv, DES_DECRYPT); |
| 357 |
DES_ncbc_encrypt(buf, newbuf, bytes, (DES_key_schedule *)&key[16], (DES_cblock *)iv, DES_ENCRYPT); |
| 358 |
|
| 359 |
#endif |
| 360 |
|
| 361 |
//debug_print(53, newbuf, bytes); |
| 362 |
|
| 363 |
memcpy(buf, newbuf, bytes); |
| 364 |
free(newbuf); |
| 365 |
|
| 366 |
#endif |
| 367 |
} |
| 368 |
|
| 369 |
static void c3DES_CBC_decrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 370 |
int bytes) |
| 371 |
{ |
| 372 |
unsigned char key[24], iv[8]; |
| 373 |
unsigned char *newbuf = malloc(bytes); |
| 374 |
|
| 375 |
if (newbuf == NULL) |
| 376 |
return; |
| 377 |
|
| 378 |
#if 1 |
| 379 |
if (EVP_Cipher(&pvar->evpcip[MODE_IN], newbuf, buf, bytes) == 0) { |
| 380 |
// TODO: |
| 381 |
|
| 382 |
} else { |
| 383 |
memcpy(key, pvar->ssh2_keys[MODE_IN].enc.key, 24); |
| 384 |
// IV��DES���������X�V�����������A���[�J�����R�s�[���������g���B |
| 385 |
memcpy(iv, pvar->ssh2_keys[MODE_IN].enc.iv, 8); |
| 386 |
|
| 387 |
//debug_print(70, key, 24); |
| 388 |
//debug_print(71, iv, 8); |
| 389 |
//debug_print(72, buf, bytes); |
| 390 |
//debug_print(73, newbuf, bytes); |
| 391 |
|
| 392 |
memcpy(buf, newbuf, bytes); |
| 393 |
} |
| 394 |
free(newbuf); |
| 395 |
|
| 396 |
#else |
| 397 |
unsigned char *key, iv[8]; |
| 398 |
unsigned char *newbuf = malloc(bytes); |
| 399 |
if (newbuf == NULL) |
| 400 |
return; |
| 401 |
|
| 402 |
key = pvar->ssh2_keys[MODE_IN].enc.key; |
| 403 |
// IV��DES���������X�V�����������A���[�J�����R�s�[���������g���B |
| 404 |
memcpy(iv, pvar->ssh2_keys[MODE_IN].enc.iv, 8); |
| 405 |
|
| 406 |
//debug_print(60, key, 24); |
| 407 |
//debug_print(61, iv, 8); |
| 408 |
//debug_print(62, buf, bytes); |
| 409 |
|
| 410 |
DES_ede3_cbc_encrypt( |
| 411 |
buf, newbuf, bytes, |
| 412 |
(DES_key_schedule *)&key[0], |
| 413 |
(DES_key_schedule *)&key[8], |
| 414 |
(DES_key_schedule *)&key[16], |
| 415 |
(DES_cblock *)iv, |
| 416 |
DES_DECRYPT); |
| 417 |
|
| 418 |
//debug_print(63, newbuf, bytes); |
| 419 |
|
| 420 |
memcpy(buf, newbuf, bytes); |
| 421 |
|
| 422 |
free(newbuf); |
| 423 |
#endif |
| 424 |
} |
| 425 |
|
| 426 |
|
| 427 |
static void c3DES_encrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 428 |
int bytes) |
| 429 |
{ |
| 430 |
Cipher3DESState FAR *encryptstate = &pvar->crypt_state.enc.c3DES; |
| 431 |
|
| 432 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 433 |
&encryptstate->k1, &encryptstate->ivec1, DES_ENCRYPT); |
| 434 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 435 |
&encryptstate->k2, &encryptstate->ivec2, DES_DECRYPT); |
| 436 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 437 |
&encryptstate->k3, &encryptstate->ivec3, DES_ENCRYPT); |
| 438 |
} |
| 439 |
|
| 440 |
static void c3DES_decrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 441 |
int bytes) |
| 442 |
{ |
| 443 |
Cipher3DESState FAR *decryptstate = &pvar->crypt_state.dec.c3DES; |
| 444 |
|
| 445 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 446 |
&decryptstate->k3, &decryptstate->ivec3, DES_DECRYPT); |
| 447 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 448 |
&decryptstate->k2, &decryptstate->ivec2, DES_ENCRYPT); |
| 449 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 450 |
&decryptstate->k1, &decryptstate->ivec1, DES_DECRYPT); |
| 451 |
} |
| 452 |
|
| 453 |
static void cDES_encrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 454 |
int bytes) |
| 455 |
{ |
| 456 |
CipherDESState FAR *encryptstate = &pvar->crypt_state.enc.cDES; |
| 457 |
|
| 458 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 459 |
&encryptstate->k, &encryptstate->ivec, DES_ENCRYPT); |
| 460 |
} |
| 461 |
|
| 462 |
static void cDES_decrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 463 |
int bytes) |
| 464 |
{ |
| 465 |
CipherDESState FAR *decryptstate = &pvar->crypt_state.dec.cDES; |
| 466 |
|
| 467 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 468 |
&decryptstate->k, &decryptstate->ivec, DES_DECRYPT); |
| 469 |
} |
| 470 |
|
| 471 |
static void cIDEA_encrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 472 |
int bytes) |
| 473 |
{ |
| 474 |
CipherIDEAState FAR *encryptstate = &pvar->crypt_state.enc.cIDEA; |
| 475 |
int num = 0; |
| 476 |
|
| 477 |
idea_cfb64_encrypt(buf, buf, bytes, &encryptstate->k, |
| 478 |
encryptstate->ivec, &num, IDEA_ENCRYPT); |
| 479 |
} |
| 480 |
|
| 481 |
static void cIDEA_decrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 482 |
int bytes) |
| 483 |
{ |
| 484 |
CipherIDEAState FAR *decryptstate = &pvar->crypt_state.dec.cIDEA; |
| 485 |
int num = 0; |
| 486 |
|
| 487 |
idea_cfb64_encrypt(buf, buf, bytes, &decryptstate->k, |
| 488 |
decryptstate->ivec, &num, IDEA_DECRYPT); |
| 489 |
} |
| 490 |
|
| 491 |
static void flip_endianness(unsigned char FAR * cbuf, int bytes) |
| 492 |
{ |
| 493 |
uint32 FAR *buf = (uint32 FAR *) cbuf; |
| 494 |
int count = bytes / 4; |
| 495 |
|
| 496 |
while (count > 0) { |
| 497 |
uint32 w = *buf; |
| 498 |
|
| 499 |
*buf = ((w << 24) & 0xFF000000) | ((w << 8) & 0x00FF0000) |
| 500 |
| ((w >> 8) & 0x0000FF00) | ((w >> 24) & 0x000000FF); |
| 501 |
count--; |
| 502 |
buf++; |
| 503 |
} |
| 504 |
} |
| 505 |
|
| 506 |
static void cBlowfish_encrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 507 |
int bytes) |
| 508 |
{ |
| 509 |
CipherBlowfishState FAR *encryptstate = |
| 510 |
&pvar->crypt_state.enc.cBlowfish; |
| 511 |
|
| 512 |
flip_endianness(buf, bytes); |
| 513 |
BF_cbc_encrypt(buf, buf, bytes, &encryptstate->k, encryptstate->ivec, |
| 514 |
BF_ENCRYPT); |
| 515 |
flip_endianness(buf, bytes); |
| 516 |
} |
| 517 |
|
| 518 |
static void cBlowfish_decrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 519 |
int bytes) |
| 520 |
{ |
| 521 |
CipherBlowfishState FAR *decryptstate = |
| 522 |
&pvar->crypt_state.dec.cBlowfish; |
| 523 |
|
| 524 |
flip_endianness(buf, bytes); |
| 525 |
BF_cbc_encrypt(buf, buf, bytes, &decryptstate->k, decryptstate->ivec, |
| 526 |
BF_DECRYPT); |
| 527 |
flip_endianness(buf, bytes); |
| 528 |
} |
| 529 |
|
| 530 |
static void cRC4_encrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 531 |
int bytes) |
| 532 |
{ |
| 533 |
CipherRC4State FAR *encryptstate = &pvar->crypt_state.enc.cRC4; |
| 534 |
int num = 0; |
| 535 |
|
| 536 |
RC4(&encryptstate->k, bytes, buf, buf); |
| 537 |
} |
| 538 |
|
| 539 |
static void cRC4_decrypt(PTInstVar pvar, unsigned char FAR * buf, |
| 540 |
int bytes) |
| 541 |
{ |
| 542 |
CipherRC4State FAR *decryptstate = &pvar->crypt_state.dec.cRC4; |
| 543 |
int num = 0; |
| 544 |
|
| 545 |
RC4(&decryptstate->k, bytes, buf, buf); |
| 546 |
} |
| 547 |
|
| 548 |
void CRYPT_set_random_data(PTInstVar pvar, unsigned char FAR * buf, |
| 549 |
int bytes) |
| 550 |
{ |
| 551 |
RAND_bytes(buf, bytes); |
| 552 |
} |
| 553 |
|
| 554 |
void CRYPT_initialize_random_numbers(PTInstVar pvar) |
| 555 |
{ |
| 556 |
RAND_screen(); |
| 557 |
} |
| 558 |
|
| 559 |
static BIGNUM FAR *get_bignum(unsigned char FAR * bytes) |
| 560 |
{ |
| 561 |
int bits = get_ushort16_MSBfirst(bytes); |
| 562 |
|
| 563 |
return BN_bin2bn(bytes + 2, (bits + 7) / 8, NULL); |
| 564 |
} |
| 565 |
|
| 566 |
static RSA FAR *make_key(PTInstVar pvar, |
| 567 |
int bits, unsigned char FAR * exp, |
| 568 |
unsigned char FAR * mod) |
| 569 |
{ |
| 570 |
RSA FAR *key = RSA_new(); |
| 571 |
|
| 572 |
if (key != NULL) { |
| 573 |
key->e = get_bignum(exp); |
| 574 |
key->n = get_bignum(mod); |
| 575 |
} |
| 576 |
|
| 577 |
if (key == NULL || key->e == NULL || key->n == NULL) { |
| 578 |
notify_fatal_error(pvar, "Error setting up RSA keys"); |
| 579 |
|
| 580 |
if (key != NULL) { |
| 581 |
if (key->e != NULL) { |
| 582 |
BN_free(key->e); |
| 583 |
} |
| 584 |
if (key->n != NULL) { |
| 585 |
BN_free(key->n); |
| 586 |
} |
| 587 |
RSA_free(key); |
| 588 |
} |
| 589 |
|
| 590 |
return NULL; |
| 591 |
} else { |
| 592 |
return key; |
| 593 |
} |
| 594 |
} |
| 595 |
|
| 596 |
void CRYPT_set_server_cookie(PTInstVar pvar, unsigned char FAR * cookie) |
| 597 |
{ |
| 598 |
if (SSHv1(pvar)) { |
| 599 |
memcpy(pvar->crypt_state.server_cookie, cookie, SSH_COOKIE_LENGTH); |
| 600 |
} else { |
| 601 |
memcpy(pvar->crypt_state.server_cookie, cookie, |
| 602 |
SSH2_COOKIE_LENGTH); |
| 603 |
} |
| 604 |
} |
| 605 |
|
| 606 |
void CRYPT_set_client_cookie(PTInstVar pvar, unsigned char FAR * cookie) |
| 607 |
{ |
| 608 |
if (SSHv2(pvar)) { |
| 609 |
memcpy(pvar->crypt_state.client_cookie, cookie, |
| 610 |
SSH2_COOKIE_LENGTH); |
| 611 |
} |
| 612 |
} |
| 613 |
|
| 614 |
BOOL CRYPT_set_server_RSA_key(PTInstVar pvar, |
| 615 |
int bits, unsigned char FAR * exp, |
| 616 |
unsigned char FAR * mod) |
| 617 |
{ |
| 618 |
pvar->crypt_state.server_key.RSA_key = make_key(pvar, bits, exp, mod); |
| 619 |
|
| 620 |
return pvar->crypt_state.server_key.RSA_key != NULL; |
| 621 |
} |
| 622 |
|
| 623 |
BOOL CRYPT_set_host_RSA_key(PTInstVar pvar, |
| 624 |
int bits, unsigned char FAR * exp, |
| 625 |
unsigned char FAR * mod) |
| 626 |
{ |
| 627 |
pvar->crypt_state.host_key.RSA_key = make_key(pvar, bits, exp, mod); |
| 628 |
|
| 629 |
return pvar->crypt_state.host_key.RSA_key != NULL; |
| 630 |
} |
| 631 |
|
| 632 |
BOOL CRYPT_set_supported_ciphers(PTInstVar pvar, int sender_ciphers, |
| 633 |
int receiver_ciphers) |
| 634 |
{ |
| 635 |
int cipher_mask; |
| 636 |
|
| 637 |
if (SSHv1(pvar)) { |
| 638 |
cipher_mask = (1 << SSH_CIPHER_DES) |
| 639 |
| (1 << SSH_CIPHER_3DES) |
| 640 |
| (1 << SSH_CIPHER_BLOWFISH); |
| 641 |
|
| 642 |
} else { // for SSH2(yutaka) |
| 643 |
// SSH2���T�|�[�g�����f�[�^���M�p�A���S���Y���i���J�������p�������j |
| 644 |
cipher_mask = (1 << SSH_CIPHER_3DES_CBC) | (1 << SSH_CIPHER_AES128); |
| 645 |
|
| 646 |
} |
| 647 |
|
| 648 |
sender_ciphers &= cipher_mask; |
| 649 |
receiver_ciphers &= cipher_mask; |
| 650 |
pvar->crypt_state.supported_sender_ciphers = sender_ciphers; |
| 651 |
pvar->crypt_state.supported_receiver_ciphers = receiver_ciphers; |
| 652 |
|
| 653 |
if (sender_ciphers == 0) { |
| 654 |
notify_fatal_error(pvar, |
| 655 |
"The server does not support any of the TTSSH encryption algorithms.\n" |
| 656 |
"A secure connection cannot be made in the TTSSH-to-server direction.\n" |
| 657 |
"The connection will be closed."); |
| 658 |
return FALSE; |
| 659 |
} else if (receiver_ciphers == 0) { |
| 660 |
notify_fatal_error(pvar, |
| 661 |
"The server does not support any of the TTSSH encryption algorithms.\n" |
| 662 |
"A secure connection cannot be made in the server-to-TTSSH direction.\n" |
| 663 |
"The connection will be closed."); |
| 664 |
return FALSE; |
| 665 |
} else { |
| 666 |
return TRUE; |
| 667 |
} |
| 668 |
} |
| 669 |
|
| 670 |
int CRYPT_get_decryption_block_size(PTInstVar pvar) |
| 671 |
{ |
| 672 |
if (SSHv1(pvar)) { |
| 673 |
return 8; |
| 674 |
} else { |
| 675 |
// �p�P�b�g���M���������������A���S���Y�����u���b�N�T�C�Y (2004.11.7 yutaka) |
| 676 |
// cf. 3DES=8, AES128=16 |
| 677 |
return (pvar->ssh2_keys[MODE_IN].enc.block_size); |
| 678 |
} |
| 679 |
} |
| 680 |
|
| 681 |
int CRYPT_get_encryption_block_size(PTInstVar pvar) |
| 682 |
{ |
| 683 |
if (SSHv1(pvar)) { |
| 684 |
return 8; |
| 685 |
} else { |
| 686 |
// �p�P�b�g���M���������������A���S���Y�����u���b�N�T�C�Y (2004.11.7 yutaka) |
| 687 |
// cf. 3DES=8, AES128=16 |
| 688 |
return (pvar->ssh2_keys[MODE_OUT].enc.block_size); |
| 689 |
} |
| 690 |
} |
| 691 |
|
| 692 |
int CRYPT_get_receiver_MAC_size(PTInstVar pvar) |
| 693 |
{ |
| 694 |
struct Mac *mac; |
| 695 |
|
| 696 |
if (SSHv1(pvar)) { |
| 697 |
return 0; |
| 698 |
|
| 699 |
} else { // for SSH2(yutaka) |
| 700 |
mac = &pvar->ssh2_keys[MODE_IN].mac; |
| 701 |
if (mac == NULL || mac->enabled == 0) |
| 702 |
return 0; |
| 703 |
|
| 704 |
return (pvar->ssh2_keys[MODE_IN].mac.mac_len); |
| 705 |
} |
| 706 |
|
| 707 |
} |
| 708 |
|
| 709 |
// HMAC������ |
| 710 |
// ���{������ SSH2 �������g�p�������B |
| 711 |
// (2004.12.17 yutaka) |
| 712 |
BOOL CRYPT_verify_receiver_MAC(PTInstVar pvar, uint32 sequence_number, |
| 713 |
char FAR * data, int len, char FAR * MAC) |
| 714 |
{ |
| 715 |
HMAC_CTX c; |
| 716 |
unsigned char m[EVP_MAX_MD_SIZE]; |
| 717 |
unsigned char b[4]; |
| 718 |
struct Mac *mac; |
| 719 |
|
| 720 |
mac = &pvar->ssh2_keys[MODE_IN].mac; |
| 721 |
|
| 722 |
// HMAC�������L���������������A����OK�����������B |
| 723 |
if (mac == NULL || mac->enabled == 0) |
| 724 |
return TRUE; |
| 725 |
|
| 726 |
if (mac->key == NULL) |
| 727 |
goto error; |
| 728 |
|
| 729 |
if ((u_int)mac->mac_len > sizeof(m)) |
| 730 |
goto error; |
| 731 |
|
| 732 |
HMAC_Init(&c, mac->key, mac->key_len, mac->md); |
| 733 |
set_uint32_MSBfirst(b, sequence_number); |
| 734 |
HMAC_Update(&c, b, sizeof(b)); |
| 735 |
HMAC_Update(&c, data, len); |
| 736 |
HMAC_Final(&c, m, NULL); |
| 737 |
HMAC_cleanup(&c); |
| 738 |
|
| 739 |
if (memcmp(m, MAC, mac->mac_len)) { |
| 740 |
goto error; |
| 741 |
} |
| 742 |
|
| 743 |
return TRUE; |
| 744 |
|
| 745 |
error: |
| 746 |
return FALSE; |
| 747 |
} |
| 748 |
|
| 749 |
int CRYPT_get_sender_MAC_size(PTInstVar pvar) |
| 750 |
{ |
| 751 |
struct Mac *mac; |
| 752 |
|
| 753 |
if (SSHv2(pvar)) { // for SSH2(yutaka) |
| 754 |
mac = &pvar->ssh2_keys[MODE_OUT].mac; |
| 755 |
if (mac == NULL || mac->enabled == 0) |
| 756 |
return 0; |
| 757 |
|
| 758 |
return (mac->mac_len); |
| 759 |
} |
| 760 |
|
| 761 |
return 0; |
| 762 |
} |
| 763 |
|
| 764 |
// for SSH2 |
| 765 |
BOOL CRYPT_build_sender_MAC(PTInstVar pvar, uint32 sequence_number, |
| 766 |
char FAR * data, int len, char FAR * MAC) |
| 767 |
{ |
| 768 |
HMAC_CTX c; |
| 769 |
static u_char m[EVP_MAX_MD_SIZE]; |
| 770 |
u_char b[4]; |
| 771 |
struct Mac *mac; |
| 772 |
|
| 773 |
if (SSHv2(pvar)) { // for SSH2(yutaka) |
| 774 |
mac = &pvar->ssh2_keys[MODE_OUT].mac; |
| 775 |
if (mac == NULL || mac->enabled == 0) |
| 776 |
return FALSE; |
| 777 |
|
| 778 |
HMAC_Init(&c, mac->key, mac->key_len, mac->md); |
| 779 |
set_uint32_MSBfirst(b, sequence_number); |
| 780 |
HMAC_Update(&c, b, sizeof(b)); |
| 781 |
HMAC_Update(&c, data, len); |
| 782 |
HMAC_Final(&c, m, NULL); |
| 783 |
HMAC_cleanup(&c); |
| 784 |
|
| 785 |
// 20�o�C�g�������R�s�[ |
| 786 |
memcpy(MAC, m, pvar->ssh2_keys[MODE_OUT].mac.mac_len); |
| 787 |
// memcpy(MAC, m, sizeof(m)); |
| 788 |
|
| 789 |
return TRUE; |
| 790 |
} |
| 791 |
|
| 792 |
return TRUE; |
| 793 |
|
| 794 |
} |
| 795 |
|
| 796 |
static int choose_cipher(PTInstVar pvar, int supported) |
| 797 |
{ |
| 798 |
int i; |
| 799 |
|
| 800 |
for (i = 0; pvar->session_settings.CipherOrder[i] != 0; i++) { |
| 801 |
int cipher = pvar->session_settings.CipherOrder[i] - '0'; |
| 802 |
|
| 803 |
if (cipher == SSH_CIPHER_NONE) { |
| 804 |
break; |
| 805 |
} else if ((supported & (1 << cipher)) != 0) { |
| 806 |
return cipher; |
| 807 |
} |
| 808 |
} |
| 809 |
|
| 810 |
return SSH_CIPHER_NONE; |
| 811 |
} |
| 812 |
|
| 813 |
BOOL CRYPT_choose_ciphers(PTInstVar pvar) |
| 814 |
{ |
| 815 |
if (SSHv1(pvar)) { |
| 816 |
pvar->crypt_state.sender_cipher = choose_cipher(pvar, |
| 817 |
pvar->crypt_state. |
| 818 |
supported_sender_ciphers); |
| 819 |
pvar->crypt_state.receiver_cipher = |
| 820 |
choose_cipher(pvar, pvar->crypt_state.supported_receiver_ciphers); |
| 821 |
|
| 822 |
} else { // SSH2(yutaka) |
| 823 |
pvar->crypt_state.sender_cipher = pvar->ctos_cipher; |
| 824 |
pvar->crypt_state.receiver_cipher =pvar->stoc_cipher; |
| 825 |
|
| 826 |
} |
| 827 |
|
| 828 |
if (pvar->crypt_state.sender_cipher == SSH_CIPHER_NONE |
| 829 |
|| pvar->crypt_state.receiver_cipher == SSH_CIPHER_NONE) { |
| 830 |
notify_fatal_error(pvar, |
| 831 |
"All the encryption algorithms that this program and the server both understand have been disabled.\n" |
| 832 |
"To communicate with this server, you will have to enable some more ciphers\n" |
| 833 |
"in the TTSSH Setup dialog box when you run Teraterm again.\n" |
| 834 |
"This connection will now close."); |
| 835 |
return FALSE; |
| 836 |
} else { |
| 837 |
return TRUE; |
| 838 |
} |
| 839 |
} |
| 840 |
|
| 841 |
int CRYPT_get_encrypted_session_key_len(PTInstVar pvar) |
| 842 |
{ |
| 843 |
int server_key_bits = |
| 844 |
BN_num_bits(pvar->crypt_state.server_key.RSA_key->n); |
| 845 |
int host_key_bits = BN_num_bits(pvar->crypt_state.host_key.RSA_key->n); |
| 846 |
int server_key_bytes = (server_key_bits + 7) / 8; |
| 847 |
int host_key_bytes = (host_key_bits + 7) / 8; |
| 848 |
|
| 849 |
if (server_key_bits < host_key_bits) { |
| 850 |
return host_key_bytes; |
| 851 |
} else { |
| 852 |
return server_key_bytes; |
| 853 |
} |
| 854 |
} |
| 855 |
|
| 856 |
int CRYPT_choose_session_key(PTInstVar pvar, |
| 857 |
unsigned char FAR * encrypted_key_buf) |
| 858 |
{ |
| 859 |
int server_key_bits = |
| 860 |
BN_num_bits(pvar->crypt_state.server_key.RSA_key->n); |
| 861 |
int host_key_bits = BN_num_bits(pvar->crypt_state.host_key.RSA_key->n); |
| 862 |
int server_key_bytes = (server_key_bits + 7) / 8; |
| 863 |
int host_key_bytes = (host_key_bits + 7) / 8; |
| 864 |
int encrypted_key_bytes; |
| 865 |
int bit_delta; |
| 866 |
|
| 867 |
if (server_key_bits < host_key_bits) { |
| 868 |
encrypted_key_bytes = host_key_bytes; |
| 869 |
bit_delta = host_key_bits - server_key_bits; |
| 870 |
} else { |
| 871 |
encrypted_key_bytes = server_key_bytes; |
| 872 |
bit_delta = server_key_bits - host_key_bits; |
| 873 |
} |
| 874 |
|
| 875 |
if (bit_delta < 128 || server_key_bits < 512 || host_key_bits < 512) { |
| 876 |
notify_fatal_error(pvar, |
| 877 |
"Server RSA keys are too weak. A secure connection cannot be established."); |
| 878 |
return 0; |
| 879 |
} else { |
| 880 |
/* following Goldberg's code, I'm using MD5(servkey->n || hostkey->n || cookie) |
| 881 |
for the session ID, rather than the one specified in the RFC */ |
| 882 |
int session_buf_len = server_key_bytes + host_key_bytes + 8; |
| 883 |
char FAR *session_buf = (char FAR *) malloc(session_buf_len); |
| 884 |
char session_id[16]; |
| 885 |
int i; |
| 886 |
|
| 887 |
BN_bn2bin(pvar->crypt_state.host_key.RSA_key->n, session_buf); |
| 888 |
BN_bn2bin(pvar->crypt_state.server_key.RSA_key->n, |
| 889 |
session_buf + host_key_bytes); |
| 890 |
memcpy(session_buf + server_key_bytes + host_key_bytes, |
| 891 |
pvar->crypt_state.server_cookie, 8); |
| 892 |
MD5(session_buf, session_buf_len, session_id); |
| 893 |
|
| 894 |
free(session_buf); |
| 895 |
|
| 896 |
RAND_bytes(pvar->crypt_state.sender_cipher_key, |
| 897 |
SSH_SESSION_KEY_LENGTH); |
| 898 |
memcpy(pvar->crypt_state.receiver_cipher_key, |
| 899 |
pvar->crypt_state.sender_cipher_key, |
| 900 |
SSH_SESSION_KEY_LENGTH); |
| 901 |
|
| 902 |
memcpy(encrypted_key_buf + encrypted_key_bytes - |
| 903 |
SSH_SESSION_KEY_LENGTH, pvar->crypt_state.sender_cipher_key, |
| 904 |
SSH_SESSION_KEY_LENGTH); |
| 905 |
for (i = 0; i < sizeof(session_id); i++) { |
| 906 |
encrypted_key_buf[encrypted_key_bytes - |
| 907 |
SSH_SESSION_KEY_LENGTH + i] |
| 908 |
^= session_id[i]; |
| 909 |
} |
| 910 |
|
| 911 |
if (host_key_bits > server_key_bits) { |
| 912 |
if (RSA_public_encrypt(SSH_SESSION_KEY_LENGTH, |
| 913 |
encrypted_key_buf + |
| 914 |
encrypted_key_bytes - |
| 915 |
SSH_SESSION_KEY_LENGTH, |
| 916 |
encrypted_key_buf + |
| 917 |
encrypted_key_bytes - server_key_bytes, |
| 918 |
pvar->crypt_state.server_key.RSA_key, |
| 919 |
RSA_PKCS1_PADDING) < 0) |
| 920 |
return 0; |
| 921 |
|
| 922 |
if (RSA_public_encrypt(server_key_bytes, |
| 923 |
encrypted_key_buf + |
| 924 |
encrypted_key_bytes - server_key_bytes, |
| 925 |
encrypted_key_buf, |
| 926 |
pvar->crypt_state.host_key.RSA_key, |
| 927 |
RSA_PKCS1_PADDING) < 0) |
| 928 |
return 0; |
| 929 |
} else { |
| 930 |
if (RSA_public_encrypt(SSH_SESSION_KEY_LENGTH, |
| 931 |
encrypted_key_buf + |
| 932 |
encrypted_key_bytes - |
| 933 |
SSH_SESSION_KEY_LENGTH, |
| 934 |
encrypted_key_buf + |
| 935 |
encrypted_key_bytes - host_key_bytes, |
| 936 |
pvar->crypt_state.host_key.RSA_key, |
| 937 |
RSA_PKCS1_PADDING) < 0) |
| 938 |
return 0; |
| 939 |
|
| 940 |
if (RSA_public_encrypt(host_key_bytes, |
| 941 |
encrypted_key_buf + |
| 942 |
encrypted_key_bytes - host_key_bytes, |
| 943 |
encrypted_key_buf, |
| 944 |
pvar->crypt_state.server_key.RSA_key, |
| 945 |
RSA_PKCS1_PADDING) < 0) |
| 946 |
return 0; |
| 947 |
} |
| 948 |
} |
| 949 |
|
| 950 |
return 1; |
| 951 |
} |
| 952 |
|
| 953 |
int CRYPT_generate_RSA_challenge_response(PTInstVar pvar, |
| 954 |
unsigned char FAR * challenge, |
| 955 |
int challenge_len, |
| 956 |
unsigned char FAR * response) |
| 957 |
{ |
| 958 |
int server_key_bits = |
| 959 |
BN_num_bits(pvar->crypt_state.server_key.RSA_key->n); |
| 960 |
int host_key_bits = BN_num_bits(pvar->crypt_state.host_key.RSA_key->n); |
| 961 |
int server_key_bytes = (server_key_bits + 7) / 8; |
| 962 |
int host_key_bytes = (host_key_bits + 7) / 8; |
| 963 |
int session_buf_len = server_key_bytes + host_key_bytes + 8; |
| 964 |
char FAR *session_buf = (char FAR *) malloc(session_buf_len); |
| 965 |
char decrypted_challenge[48]; |
| 966 |
int decrypted_challenge_len; |
| 967 |
|
| 968 |
decrypted_challenge_len = |
| 969 |
RSA_private_decrypt(challenge_len, challenge, challenge, |
| 970 |
AUTH_get_cur_cred(pvar)->key_pair->RSA_key, |
| 971 |
RSA_PKCS1_PADDING); |
| 972 |
if (decrypted_challenge_len < 0) { |
| 973 |
free(session_buf); |
| 974 |
return 0; |
| 975 |
} |
| 976 |
if (decrypted_challenge_len >= SSH_RSA_CHALLENGE_LENGTH) { |
| 977 |
memcpy(decrypted_challenge, |
| 978 |
challenge + decrypted_challenge_len - |
| 979 |
SSH_RSA_CHALLENGE_LENGTH, SSH_RSA_CHALLENGE_LENGTH); |
| 980 |
} else { |
| 981 |
memset(decrypted_challenge, 0, |
| 982 |
SSH_RSA_CHALLENGE_LENGTH - decrypted_challenge_len); |
| 983 |
memcpy(decrypted_challenge + SSH_RSA_CHALLENGE_LENGTH - |
| 984 |
decrypted_challenge_len, challenge, |
| 985 |
decrypted_challenge_len); |
| 986 |
} |
| 987 |
|
| 988 |
BN_bn2bin(pvar->crypt_state.host_key.RSA_key->n, session_buf); |
| 989 |
BN_bn2bin(pvar->crypt_state.server_key.RSA_key->n, |
| 990 |
session_buf + host_key_bytes); |
| 991 |
memcpy(session_buf + server_key_bytes + host_key_bytes, |
| 992 |
pvar->crypt_state.server_cookie, 8); |
| 993 |
MD5(session_buf, session_buf_len, decrypted_challenge + 32); |
| 994 |
|
| 995 |
free(session_buf); |
| 996 |
|
| 997 |
MD5(decrypted_challenge, 48, response); |
| 998 |
|
| 999 |
return 1; |
| 1000 |
} |
| 1001 |
|
| 1002 |
static void c3DES_init(char FAR * session_key, Cipher3DESState FAR * state) |
| 1003 |
{ |
| 1004 |
DES_set_key((const_DES_cblock FAR *) session_key, &state->k1); |
| 1005 |
DES_set_key((const_DES_cblock FAR *) (session_key + 8), &state->k2); |
| 1006 |
DES_set_key((const_DES_cblock FAR *) (session_key + 16), &state->k3); |
| 1007 |
memset(state->ivec1, 0, 8); |
| 1008 |
memset(state->ivec2, 0, 8); |
| 1009 |
memset(state->ivec3, 0, 8); |
| 1010 |
} |
| 1011 |
|
| 1012 |
static void cDES_init(char FAR * session_key, CipherDESState FAR * state) |
| 1013 |
{ |
| 1014 |
DES_set_key((const_des_cblock FAR *) session_key, &state->k); |
| 1015 |
memset(state->ivec, 0, 8); |
| 1016 |
} |
| 1017 |
|
| 1018 |
static void cIDEA_init(char FAR * session_key, CipherIDEAState FAR * state) |
| 1019 |
{ |
| 1020 |
idea_set_encrypt_key(session_key, &state->k); |
| 1021 |
memset(state->ivec, 0, 8); |
| 1022 |
} |
| 1023 |
|
| 1024 |
static void cBlowfish_init(char FAR * session_key, |
| 1025 |
CipherBlowfishState FAR * state) |
| 1026 |
{ |
| 1027 |
BF_set_key(&state->k, 32, session_key); |
| 1028 |
memset(state->ivec, 0, 8); |
| 1029 |
} |
| 1030 |
|
| 1031 |
|
| 1032 |
// |
| 1033 |
// SSH2�p�A���S���Y���������� |
| 1034 |
// |
| 1035 |
// for SSH2(yutaka) |
| 1036 |
// |
| 1037 |
void cipher_init_SSH2( |
| 1038 |
EVP_CIPHER_CTX *evp, |
| 1039 |
const u_char *key, u_int keylen, |
| 1040 |
const u_char *iv, u_int ivlen, |
| 1041 |
int encrypt, |
| 1042 |
const EVP_CIPHER *(*func)(void) |
| 1043 |
) |
| 1044 |
{ |
| 1045 |
EVP_CIPHER *type; |
| 1046 |
int klen; |
| 1047 |
|
| 1048 |
type = (EVP_CIPHER *)func(); |
| 1049 |
|
| 1050 |
EVP_CIPHER_CTX_init(evp); |
| 1051 |
if (EVP_CipherInit(evp, type, NULL, (u_char *)iv, (encrypt == CIPHER_ENCRYPT)) == 0) { |
| 1052 |
// TODO: |
| 1053 |
} |
| 1054 |
|
| 1055 |
klen = EVP_CIPHER_CTX_key_length(evp); |
| 1056 |
if (klen > 0 && keylen != klen) { |
| 1057 |
if (EVP_CIPHER_CTX_set_key_length(evp, keylen) == 0) { |
| 1058 |
// TODO: |
| 1059 |
} |
| 1060 |
} |
| 1061 |
if (EVP_CipherInit(evp, NULL, (u_char *)key, NULL, -1) == 0) { |
| 1062 |
// TODO: |
| 1063 |
} |
| 1064 |
} |
| 1065 |
|
| 1066 |
|
| 1067 |
BOOL CRYPT_start_encryption(PTInstVar pvar, int sender_flag, int receiver_flag) |
| 1068 |
{ |
| 1069 |
char FAR *encryption_key = pvar->crypt_state.sender_cipher_key; |
| 1070 |
char FAR *decryption_key = pvar->crypt_state.receiver_cipher_key; |
| 1071 |
BOOL isOK = TRUE; |
| 1072 |
|
| 1073 |
if (sender_flag) { |
| 1074 |
switch (pvar->crypt_state.sender_cipher) { |
| 1075 |
// for SSH2(yutaka) |
| 1076 |
case SSH_CIPHER_3DES_CBC: |
| 1077 |
{ |
| 1078 |
struct Enc *enc; |
| 1079 |
|
| 1080 |
enc = &pvar->ssh2_keys[MODE_OUT].enc; |
| 1081 |
cipher_init_SSH2(&pvar->evpcip[MODE_OUT], |
| 1082 |
enc->key, 24, enc->iv, 8, |
| 1083 |
CIPHER_ENCRYPT, |
| 1084 |
EVP_des_ede3_cbc); |
| 1085 |
|
| 1086 |
//debug_print(10, enc->key, 24); |
| 1087 |
//debug_print(11, enc->iv, 24); |
| 1088 |
|
| 1089 |
pvar->crypt_state.encrypt = c3DES_CBC_encrypt; |
| 1090 |
break; |
| 1091 |
} |
| 1092 |
|
| 1093 |
// for SSH2(yutaka) |
| 1094 |
case SSH_CIPHER_AES128: |
| 1095 |
{ |
| 1096 |
struct Enc *enc; |
| 1097 |
|
| 1098 |
enc = &pvar->ssh2_keys[MODE_OUT].enc; |
| 1099 |
cipher_init_SSH2(&pvar->evpcip[MODE_OUT], |
| 1100 |
enc->key, 16, enc->iv, 16, |
| 1101 |
CIPHER_ENCRYPT, |
| 1102 |
EVP_aes_128_cbc); |
| 1103 |
|
| 1104 |
//debug_print(10, enc->key, 24); |
| 1105 |
//debug_print(11, enc->iv, 24); |
| 1106 |
|
| 1107 |
pvar->crypt_state.encrypt = cAES128_encrypt; |
| 1108 |
break; |
| 1109 |
} |
| 1110 |
|
| 1111 |
case SSH_CIPHER_3DES:{ |
| 1112 |
c3DES_init(encryption_key, &pvar->crypt_state.enc.c3DES); |
| 1113 |
pvar->crypt_state.encrypt = c3DES_encrypt; |
| 1114 |
break; |
| 1115 |
} |
| 1116 |
case SSH_CIPHER_IDEA:{ |
| 1117 |
cIDEA_init(encryption_key, &pvar->crypt_state.enc.cIDEA); |
| 1118 |
pvar->crypt_state.encrypt = cIDEA_encrypt; |
| 1119 |
break; |
| 1120 |
} |
| 1121 |
case SSH_CIPHER_DES:{ |
| 1122 |
cDES_init(encryption_key, &pvar->crypt_state.enc.cDES); |
| 1123 |
pvar->crypt_state.encrypt = cDES_encrypt; |
| 1124 |
break; |
| 1125 |
} |
| 1126 |
case SSH_CIPHER_RC4:{ |
| 1127 |
RC4_set_key(&pvar->crypt_state.enc.cRC4.k, 16, |
| 1128 |
encryption_key + 16); |
| 1129 |
pvar->crypt_state.encrypt = cRC4_encrypt; |
| 1130 |
break; |
| 1131 |
} |
| 1132 |
case SSH_CIPHER_BLOWFISH:{ |
| 1133 |
cBlowfish_init(encryption_key, |
| 1134 |
&pvar->crypt_state.enc.cBlowfish); |
| 1135 |
pvar->crypt_state.encrypt = cBlowfish_encrypt; |
| 1136 |
break; |
| 1137 |
} |
| 1138 |
default: |
| 1139 |
isOK = FALSE; |
| 1140 |
} |
| 1141 |
} |
| 1142 |
|
| 1143 |
|
| 1144 |
if (receiver_flag) { |
| 1145 |
switch (pvar->crypt_state.receiver_cipher) { |
| 1146 |
// for SSH2(yutaka) |
| 1147 |
case SSH_CIPHER_3DES_CBC: |
| 1148 |
{ |
| 1149 |
struct Enc *enc; |
| 1150 |
|
| 1151 |
enc = &pvar->ssh2_keys[MODE_IN].enc; |
| 1152 |
cipher_init_SSH2(&pvar->evpcip[MODE_IN], |
| 1153 |
enc->key, 24, enc->iv, 8, |
| 1154 |
CIPHER_DECRYPT, |
| 1155 |
EVP_des_ede3_cbc); |
| 1156 |
|
| 1157 |
//debug_print(12, enc->key, 24); |
| 1158 |
//debug_print(13, enc->iv, 24); |
| 1159 |
|
| 1160 |
pvar->crypt_state.decrypt = c3DES_CBC_decrypt; |
| 1161 |
break; |
| 1162 |
} |
| 1163 |
|
| 1164 |
// for SSH2(yutaka) |
| 1165 |
case SSH_CIPHER_AES128: |
| 1166 |
{ |
| 1167 |
struct Enc *enc; |
| 1168 |
|
| 1169 |
enc = &pvar->ssh2_keys[MODE_IN].enc; |
| 1170 |
cipher_init_SSH2(&pvar->evpcip[MODE_IN], |
| 1171 |
enc->key, 16, enc->iv, 16, |
| 1172 |
CIPHER_DECRYPT, |
| 1173 |
EVP_aes_128_cbc); |
| 1174 |
|
| 1175 |
//debug_print(12, enc->key, 24); |
| 1176 |
//debug_print(13, enc->iv, 24); |
| 1177 |
|
| 1178 |
pvar->crypt_state.decrypt = cAES128_decrypt; |
| 1179 |
break; |
| 1180 |
} |
| 1181 |
|
| 1182 |
case SSH_CIPHER_3DES:{ |
| 1183 |
c3DES_init(decryption_key, &pvar->crypt_state.dec.c3DES); |
| 1184 |
pvar->crypt_state.decrypt = c3DES_decrypt; |
| 1185 |
break; |
| 1186 |
} |
| 1187 |
case SSH_CIPHER_IDEA:{ |
| 1188 |
cIDEA_init(decryption_key, &pvar->crypt_state.dec.cIDEA); |
| 1189 |
pvar->crypt_state.decrypt = cIDEA_decrypt; |
| 1190 |
break; |
| 1191 |
} |
| 1192 |
case SSH_CIPHER_DES:{ |
| 1193 |
cDES_init(decryption_key, &pvar->crypt_state.dec.cDES); |
| 1194 |
pvar->crypt_state.decrypt = cDES_decrypt; |
| 1195 |
break; |
| 1196 |
} |
| 1197 |
case SSH_CIPHER_RC4:{ |
| 1198 |
RC4_set_key(&pvar->crypt_state.dec.cRC4.k, 16, decryption_key); |
| 1199 |
pvar->crypt_state.decrypt = cRC4_decrypt; |
| 1200 |
break; |
| 1201 |
} |
| 1202 |
case SSH_CIPHER_BLOWFISH:{ |
| 1203 |
cBlowfish_init(decryption_key, |
| 1204 |
&pvar->crypt_state.dec.cBlowfish); |
| 1205 |
pvar->crypt_state.decrypt = cBlowfish_decrypt; |
| 1206 |
break; |
| 1207 |
} |
| 1208 |
default: |
| 1209 |
isOK = FALSE; |
| 1210 |
} |
| 1211 |
} |
| 1212 |
|
| 1213 |
|
| 1214 |
if (!isOK) { |
| 1215 |
notify_fatal_error(pvar, "No cipher selected!"); /* should never get here! */ |
| 1216 |
return FALSE; |
| 1217 |
} else { |
| 1218 |
memset(encryption_key, 0, CRYPT_KEY_LENGTH); |
| 1219 |
memset(decryption_key, 0, CRYPT_KEY_LENGTH); |
| 1220 |
return TRUE; |
| 1221 |
} |
| 1222 |
} |
| 1223 |
|
| 1224 |
void CRYPT_init(PTInstVar pvar) |
| 1225 |
{ |
| 1226 |
pvar->crypt_state.encrypt = no_encrypt; |
| 1227 |
pvar->crypt_state.decrypt = no_encrypt; |
| 1228 |
pvar->crypt_state.sender_cipher = SSH_CIPHER_NONE; |
| 1229 |
pvar->crypt_state.receiver_cipher = SSH_CIPHER_NONE; |
| 1230 |
pvar->crypt_state.server_key.RSA_key = NULL; |
| 1231 |
pvar->crypt_state.host_key.RSA_key = NULL; |
| 1232 |
|
| 1233 |
pvar->crypt_state.detect_attack_statics.h = NULL; |
| 1234 |
pvar->crypt_state.detect_attack_statics.n = |
| 1235 |
HASH_MINSIZE / HASH_ENTRYSIZE; |
| 1236 |
} |
| 1237 |
|
| 1238 |
static char FAR *get_cipher_name(int cipher) |
| 1239 |
{ |
| 1240 |
switch (cipher) { |
| 1241 |
case SSH_CIPHER_NONE: |
| 1242 |
return "None"; |
| 1243 |
case SSH_CIPHER_3DES: |
| 1244 |
return "3DES (168 key bits)"; |
| 1245 |
case SSH_CIPHER_DES: |
| 1246 |
return "DES (56 key bits)"; |
| 1247 |
case SSH_CIPHER_IDEA: |
| 1248 |
return "IDEA (128 key bits)"; |
| 1249 |
case SSH_CIPHER_RC4: |
| 1250 |
return "RC4 (128 key bits)"; |
| 1251 |
case SSH_CIPHER_BLOWFISH: |
| 1252 |
return "Blowfish (256 key bits)"; |
| 1253 |
|
| 1254 |
// SSH2 |
| 1255 |
case SSH_CIPHER_3DES_CBC: |
| 1256 |
return "3DES-CBC"; |
| 1257 |
case SSH_CIPHER_AES128: |
| 1258 |
return "AES128"; |
| 1259 |
|
| 1260 |
default: |
| 1261 |
return "Unknown"; |
| 1262 |
} |
| 1263 |
} |
| 1264 |
|
| 1265 |
void CRYPT_get_cipher_info(PTInstVar pvar, char FAR * dest, int len) |
| 1266 |
{ |
| 1267 |
_snprintf(dest, len, "%s to server, %s from server", |
| 1268 |
get_cipher_name(pvar->crypt_state.sender_cipher), |
| 1269 |
get_cipher_name(pvar->crypt_state.receiver_cipher)); |
| 1270 |
dest[len - 1] = 0; |
| 1271 |
} |
| 1272 |
|
| 1273 |
void CRYPT_get_server_key_info(PTInstVar pvar, char FAR * dest, int len) |
| 1274 |
{ |
| 1275 |
if (SSHv1(pvar)) { |
| 1276 |
if (pvar->crypt_state.server_key.RSA_key == NULL |
| 1277 |
|| pvar->crypt_state.host_key.RSA_key == NULL) { |
| 1278 |
strncpy(dest, "None", len); |
| 1279 |
} else { |
| 1280 |
_snprintf(dest, len, "%d-bit server key, %d-bit host key", |
| 1281 |
BN_num_bits(pvar->crypt_state.server_key.RSA_key->n), |
| 1282 |
BN_num_bits(pvar->crypt_state.host_key.RSA_key->n)); |
| 1283 |
} |
| 1284 |
|
| 1285 |
} else { // SSH2 |
| 1286 |
_snprintf(dest, len, "%d-bit server key, %d-bit host key", |
| 1287 |
pvar->server_key_bits, |
| 1288 |
pvar->client_key_bits); |
| 1289 |
|
| 1290 |
} |
| 1291 |
|
| 1292 |
dest[len - 1] = 0; |
| 1293 |
} |
| 1294 |
|
| 1295 |
static void destroy_public_key(CRYPTPublicKey FAR * key) |
| 1296 |
{ |
| 1297 |
if (key->RSA_key != NULL) { |
| 1298 |
RSA_free(key->RSA_key); |
| 1299 |
key->RSA_key = NULL; |
| 1300 |
} |
| 1301 |
} |
| 1302 |
|
| 1303 |
void CRYPT_free_public_key(CRYPTPublicKey FAR * key) |
| 1304 |
{ |
| 1305 |
destroy_public_key(key); |
| 1306 |
free(key); |
| 1307 |
} |
| 1308 |
|
| 1309 |
void CRYPT_end(PTInstVar pvar) |
| 1310 |
{ |
| 1311 |
destroy_public_key(&pvar->crypt_state.host_key); |
| 1312 |
destroy_public_key(&pvar->crypt_state.server_key); |
| 1313 |
|
| 1314 |
if (pvar->crypt_state.detect_attack_statics.h != NULL) { |
| 1315 |
memset(pvar->crypt_state.detect_attack_statics.h, 0, |
| 1316 |
pvar->crypt_state.detect_attack_statics.n * HASH_ENTRYSIZE); |
| 1317 |
free(pvar->crypt_state.detect_attack_statics.h); |
| 1318 |
} |
| 1319 |
|
| 1320 |
memset(pvar->crypt_state.sender_cipher_key, 0, |
| 1321 |
sizeof(pvar->crypt_state.sender_cipher_key)); |
| 1322 |
memset(pvar->crypt_state.receiver_cipher_key, 0, |
| 1323 |
sizeof(pvar->crypt_state.receiver_cipher_key)); |
| 1324 |
memset(pvar->crypt_state.server_cookie, 0, |
| 1325 |
sizeof(pvar->crypt_state.server_cookie)); |
| 1326 |
memset(pvar->crypt_state.client_cookie, 0, |
| 1327 |
sizeof(pvar->crypt_state.client_cookie)); |
| 1328 |
memset(&pvar->crypt_state.enc, 0, sizeof(pvar->crypt_state.enc)); |
| 1329 |
memset(&pvar->crypt_state.dec, 0, sizeof(pvar->crypt_state.dec)); |
| 1330 |
} |
| 1331 |
|
| 1332 |
int CRYPT_passphrase_decrypt(int cipher, char FAR * passphrase, |
| 1333 |
char FAR * buf, int bytes) |
| 1334 |
{ |
| 1335 |
unsigned char passphrase_key[16]; |
| 1336 |
|
| 1337 |
MD5(passphrase, strlen(passphrase), passphrase_key); |
| 1338 |
|
| 1339 |
switch (cipher) { |
| 1340 |
case SSH_CIPHER_3DES:{ |
| 1341 |
Cipher3DESState state; |
| 1342 |
|
| 1343 |
DES_set_key((const_DES_cblock FAR *) passphrase_key, |
| 1344 |
&state.k1); |
| 1345 |
DES_set_key((const_DES_cblock FAR *) (passphrase_key + 8), |
| 1346 |
&state.k2); |
| 1347 |
DES_set_key((const_DES_cblock FAR *) passphrase_key, |
| 1348 |
&state.k3); |
| 1349 |
memset(state.ivec1, 0, 8); |
| 1350 |
memset(state.ivec2, 0, 8); |
| 1351 |
memset(state.ivec3, 0, 8); |
| 1352 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 1353 |
&state.k3, &state.ivec3, DES_DECRYPT); |
| 1354 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 1355 |
&state.k2, &state.ivec2, DES_ENCRYPT); |
| 1356 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 1357 |
&state.k1, &state.ivec1, DES_DECRYPT); |
| 1358 |
break; |
| 1359 |
} |
| 1360 |
|
| 1361 |
case SSH_CIPHER_IDEA:{ |
| 1362 |
CipherIDEAState state; |
| 1363 |
int num = 0; |
| 1364 |
|
| 1365 |
cIDEA_init(passphrase_key, &state); |
| 1366 |
idea_cfb64_encrypt(buf, buf, bytes, &state.k, state.ivec, |
| 1367 |
&num, IDEA_DECRYPT); |
| 1368 |
break; |
| 1369 |
} |
| 1370 |
|
| 1371 |
case SSH_CIPHER_DES:{ |
| 1372 |
CipherDESState state; |
| 1373 |
|
| 1374 |
cDES_init(passphrase_key, &state); |
| 1375 |
DES_ncbc_encrypt(buf, buf, bytes, |
| 1376 |
&state.k, &state.ivec, DES_DECRYPT); |
| 1377 |
break; |
| 1378 |
} |
| 1379 |
|
| 1380 |
case SSH_CIPHER_RC4:{ |
| 1381 |
CipherRC4State state; |
| 1382 |
int num = 0; |
| 1383 |
|
| 1384 |
RC4_set_key(&state.k, 16, passphrase_key); |
| 1385 |
RC4(&state.k, bytes, buf, buf); |
| 1386 |
break; |
| 1387 |
} |
| 1388 |
|
| 1389 |
case SSH_CIPHER_BLOWFISH:{ |
| 1390 |
CipherBlowfishState state; |
| 1391 |
|
| 1392 |
BF_set_key(&state.k, 16, passphrase_key); |
| 1393 |
memset(state.ivec, 0, 8); |
| 1394 |
flip_endianness(buf, bytes); |
| 1395 |
BF_cbc_encrypt(buf, buf, bytes, &state.k, state.ivec, |
| 1396 |
BF_DECRYPT); |
| 1397 |
flip_endianness(buf, bytes); |
| 1398 |
break; |
| 1399 |
} |
| 1400 |
|
| 1401 |
case SSH_CIPHER_NONE: |
| 1402 |
break; |
| 1403 |
|
| 1404 |
default: |
| 1405 |
memset(passphrase_key, 0, sizeof(passphrase_key)); |
| 1406 |
return 0; |
| 1407 |
} |
| 1408 |
|
| 1409 |
memset(passphrase_key, 0, sizeof(passphrase_key)); |
| 1410 |
return 1; |
| 1411 |
} |
| 1412 |
|
| 1413 |
void CRYPT_free_key_pair(CRYPTKeyPair FAR * key_pair) |
| 1414 |
{ |
| 1415 |
if (key_pair->RSA_key != NULL) |
| 1416 |
RSA_free(key_pair->RSA_key); |
| 1417 |
|
| 1418 |
if (key_pair->DSA_key != NULL) |
| 1419 |
DSA_free(key_pair->DSA_key); |
| 1420 |
|
| 1421 |
free(key_pair); |
| 1422 |
} |
| 1423 |
|
| 1424 |
/* |
| 1425 |
* $Log: not supported by cvs2svn $ |
| 1426 |
* Revision 1.3 2004/12/22 17:28:14 yutakakn |
| 1427 |
* SSH2���J���F��(RSA/DSA)���T�|�[�g�����B |
| 1428 |
* |
| 1429 |
*/ |
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