45 |
* a client and server salt) and a global salt value used for padding. |
* a client and server salt) and a global salt value used for padding. |
46 |
* Both SHA1 and MD5 algorithms are used. |
* Both SHA1 and MD5 algorithms are used. |
47 |
*/ |
*/ |
48 |
void sec_hash_48(uint8 *out, uint8 *in, uint8 *salt1, uint8 *salt2, uint8 salt) |
void sec_hash_48(uint8 *out, uint8 *in, uint8 *salt1, uint8 *salt2, |
49 |
|
uint8 salt) |
50 |
{ |
{ |
51 |
uint8 shasig[20]; |
uint8 shasig[20]; |
52 |
uint8 pad[4]; |
uint8 pad[4]; |
56 |
|
|
57 |
for (i = 0; i < 3; i++) |
for (i = 0; i < 3; i++) |
58 |
{ |
{ |
59 |
memset(pad, salt+i, i+1); |
memset(pad, salt + i, i + 1); |
60 |
|
|
61 |
SHA1_Init(&sha); |
SHA1_Init(&sha); |
62 |
SHA1_Update(&sha, pad, i+1); |
SHA1_Update(&sha, pad, i + 1); |
63 |
SHA1_Update(&sha, in, 48); |
SHA1_Update(&sha, in, 48); |
64 |
SHA1_Update(&sha, salt1, 32); |
SHA1_Update(&sha, salt1, 32); |
65 |
SHA1_Update(&sha, salt2, 32); |
SHA1_Update(&sha, salt2, 32); |
68 |
MD5_Init(&md5); |
MD5_Init(&md5); |
69 |
MD5_Update(&md5, in, 48); |
MD5_Update(&md5, in, 48); |
70 |
MD5_Update(&md5, shasig, 20); |
MD5_Update(&md5, shasig, 20); |
71 |
MD5_Final(&out[i*16], &md5); |
MD5_Final(&out[i * 16], &md5); |
72 |
} |
} |
73 |
} |
} |
74 |
|
|
104 |
uint8 input[48]; |
uint8 input[48]; |
105 |
|
|
106 |
/* Construct input data to hash */ |
/* Construct input data to hash */ |
107 |
memcpy(input, client_key, 24); |
memcpy(input, client_key, 24); |
108 |
memcpy(input+24, server_key, 24); |
memcpy(input + 24, server_key, 24); |
109 |
|
|
110 |
/* Generate session key - two rounds of sec_hash_48 */ |
/* Generate session key - two rounds of sec_hash_48 */ |
111 |
sec_hash_48(temp_hash, input, client_key, server_key, 65); |
sec_hash_48(temp_hash, input, client_key, server_key, 65); |
112 |
sec_hash_48(session_key, temp_hash, client_key, server_key, 88); |
sec_hash_48(session_key, temp_hash, client_key, server_key, 88); |
113 |
|
|
114 |
/* Store first 8 bytes of session key, for generating signatures */ |
/* Store first 8 bytes of session key, for generating signatures */ |
115 |
memcpy(sec_sign_key, session_key, 8); |
memcpy(sec_sign_key, session_key, 8); |
116 |
|
|
117 |
/* Generate RC4 keys */ |
/* Generate RC4 keys */ |
118 |
sec_hash_16(sec_decrypt_key, &session_key[16], client_key, server_key); |
sec_hash_16(sec_decrypt_key, &session_key[16], client_key, |
119 |
sec_hash_16(sec_encrypt_key, &session_key[32], client_key, server_key); |
server_key); |
120 |
|
sec_hash_16(sec_encrypt_key, &session_key[32], client_key, |
121 |
|
server_key); |
122 |
|
|
123 |
if (rc4_key_size == 1) |
if (rc4_key_size == 1) |
124 |
{ |
{ |
143 |
RC4_set_key(&rc4_encrypt_key, rc4_key_len, sec_encrypt_key); |
RC4_set_key(&rc4_encrypt_key, rc4_key_len, sec_encrypt_key); |
144 |
} |
} |
145 |
|
|
146 |
static uint8 pad_54[40] = |
static uint8 pad_54[40] = { |
147 |
{ |
54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, |
148 |
54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54, |
54, 54, 54, |
149 |
54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54 |
54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, |
150 |
|
54, 54, 54 |
151 |
}; |
}; |
152 |
|
|
153 |
static uint8 pad_92[48] = |
static uint8 pad_92[48] = { |
154 |
{ |
92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, |
155 |
92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92, |
92, 92, 92, 92, 92, 92, 92, |
156 |
92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92,92 |
92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, |
157 |
|
92, 92, 92, 92, 92, 92, 92 |
158 |
}; |
}; |
159 |
|
|
160 |
/* Output a uint32 into a buffer (little-endian) */ |
/* Output a uint32 into a buffer (little-endian) */ |
168 |
|
|
169 |
/* Generate a signature hash, using a combination of SHA1 and MD5 */ |
/* Generate a signature hash, using a combination of SHA1 and MD5 */ |
170 |
void sec_sign(uint8 *signature, uint8 *session_key, int length, |
void sec_sign(uint8 *signature, uint8 *session_key, int length, |
171 |
uint8 *data, int datalen) |
uint8 *data, int datalen) |
172 |
{ |
{ |
173 |
uint8 shasig[20]; |
uint8 shasig[20]; |
174 |
uint8 md5sig[16]; |
uint8 md5sig[16]; |
176 |
SHA_CTX sha; |
SHA_CTX sha; |
177 |
MD5_CTX md5; |
MD5_CTX md5; |
178 |
|
|
179 |
buf_out_uint32(lenhdr, datalen); |
buf_out_uint32(lenhdr, datalen); |
180 |
|
|
181 |
SHA1_Init(&sha); |
SHA1_Init(&sha); |
182 |
SHA1_Update(&sha, session_key, length); |
SHA1_Update(&sha, session_key, length); |
254 |
} |
} |
255 |
|
|
256 |
/* Read in a NUMBER from a buffer */ |
/* Read in a NUMBER from a buffer */ |
257 |
static void sec_read_number(NUMBER *num, uint8 *buffer, int len) |
static void sec_read_number(NUMBER * num, uint8 *buffer, int len) |
258 |
{ |
{ |
259 |
INT *data = num->n_part; |
INT *data = num->n_part; |
260 |
int i, j; |
int i, j; |
261 |
|
|
262 |
for (i = 0, j = 0; j < len; i++, j += 2) |
for (i = 0, j = 0; j < len; i++, j += 2) |
263 |
data[i] = buffer[j] | (buffer[j+1] << 8); |
data[i] = buffer[j] | (buffer[j + 1] << 8); |
264 |
|
|
265 |
num->n_len = i; |
num->n_len = i; |
266 |
} |
} |
267 |
|
|
268 |
/* Write a NUMBER to a buffer */ |
/* Write a NUMBER to a buffer */ |
269 |
static void sec_write_number(NUMBER *num, uint8 *buffer, int len) |
static void sec_write_number(NUMBER * num, uint8 *buffer, int len) |
270 |
{ |
{ |
271 |
INT *data = num->n_part; |
INT *data = num->n_part; |
272 |
int i, j; |
int i, j; |
274 |
for (i = 0, j = 0; j < len; i++, j += 2) |
for (i = 0, j = 0; j < len; i++, j += 2) |
275 |
{ |
{ |
276 |
buffer[j] = data[i] & 0xff; |
buffer[j] = data[i] & 0xff; |
277 |
buffer[j+1] = data[i] >> 8; |
buffer[j + 1] = data[i] >> 8; |
278 |
} |
} |
279 |
} |
} |
280 |
|
|
302 |
STREAM s; |
STREAM s; |
303 |
|
|
304 |
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 4; |
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 4; |
305 |
s = mcs_init(maxlen + hdrlen); |
s = mcs_init(maxlen + hdrlen); |
306 |
s_push_layer(s, sec_hdr, hdrlen); |
s_push_layer(s, sec_hdr, hdrlen); |
307 |
|
|
308 |
return s; |
return s; |
323 |
|
|
324 |
#if RDP_DEBUG |
#if RDP_DEBUG |
325 |
DEBUG("Sending encrypted packet:\n"); |
DEBUG("Sending encrypted packet:\n"); |
326 |
hexdump(s->p+8, datalen); |
hexdump(s->p + 8, datalen); |
327 |
#endif |
#endif |
328 |
|
|
329 |
sec_sign(s->p, sec_sign_key, 8, s->p+8, datalen); |
sec_sign(s->p, sec_sign_key, 8, s->p + 8, datalen); |
330 |
sec_encrypt(s->p+8, datalen); |
sec_encrypt(s->p + 8, datalen); |
331 |
} |
} |
332 |
|
|
333 |
mcs_send(s); |
mcs_send(s); |
360 |
out_uint8(s, 0x7c); |
out_uint8(s, 0x7c); |
361 |
out_uint16_be(s, 1); |
out_uint16_be(s, 1); |
362 |
|
|
363 |
out_uint16_be(s, (158 | 0x8000)); /* remaining length */ |
out_uint16_be(s, (158 | 0x8000)); /* remaining length */ |
364 |
|
|
365 |
out_uint16_be(s, 8); /* length? */ |
out_uint16_be(s, 8); /* length? */ |
366 |
out_uint16_be(s, 16); |
out_uint16_be(s, 16); |
368 |
out_uint16_le(s, 0xc001); |
out_uint16_le(s, 0xc001); |
369 |
out_uint8(s, 0); |
out_uint8(s, 0); |
370 |
|
|
371 |
out_uint32_le(s, 0x61637544); /* "Duca" ?! */ |
out_uint32_le(s, 0x61637544); /* "Duca" ?! */ |
372 |
out_uint16_be(s, (144 | 0x8000)); /* remaining length */ |
out_uint16_be(s, (144 | 0x8000)); /* remaining length */ |
373 |
|
|
374 |
/* Client information */ |
/* Client information */ |
375 |
out_uint16_le(s, SEC_TAG_CLI_INFO); |
out_uint16_le(s, SEC_TAG_CLI_INFO); |
381 |
out_uint16_le(s, 0xca01); |
out_uint16_le(s, 0xca01); |
382 |
out_uint16_le(s, 0xaa03); |
out_uint16_le(s, 0xaa03); |
383 |
out_uint32_le(s, keylayout); |
out_uint32_le(s, keylayout); |
384 |
out_uint32_le(s, 419); /* client build? we are 419 compatible :-) */ |
out_uint32_le(s, 419); /* client build? we are 419 compatible :-) */ |
385 |
|
|
386 |
/* Unicode name of client, padded to 32 bytes */ |
/* Unicode name of client, padded to 32 bytes */ |
387 |
rdp_out_unistr(s, hostname, hostlen); |
rdp_out_unistr(s, hostname, hostlen); |
388 |
out_uint8s(s, 30-hostlen); |
out_uint8s(s, 30 - hostlen); |
389 |
|
|
390 |
out_uint32_le(s, 4); |
out_uint32_le(s, 4); |
391 |
out_uint32(s, 0); |
out_uint32(s, 0); |
392 |
out_uint32_le(s, 12); |
out_uint32_le(s, 12); |
393 |
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */ |
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */ |
394 |
|
|
395 |
out_uint16(s, 0xca01); |
out_uint16(s, 0xca01); |
396 |
out_uint16(s, 0); |
out_uint16(s, 0); |
421 |
return False; |
return False; |
422 |
} |
} |
423 |
|
|
424 |
in_uint8s(s, 8); /* modulus_bits, unknown */ |
in_uint8s(s, 8); /* modulus_bits, unknown */ |
425 |
in_uint8p(s, *exponent, SEC_EXPONENT_SIZE); |
in_uint8p(s, *exponent, SEC_EXPONENT_SIZE); |
426 |
in_uint8p(s, *modulus, SEC_MODULUS_SIZE); |
in_uint8p(s, *modulus, SEC_MODULUS_SIZE); |
427 |
in_uint8s(s, SEC_PADDING_SIZE); |
in_uint8s(s, SEC_PADDING_SIZE); |
431 |
|
|
432 |
/* Parse a crypto information structure */ |
/* Parse a crypto information structure */ |
433 |
static BOOL sec_parse_crypt_info(STREAM s, uint32 *rc4_key_size, |
static BOOL sec_parse_crypt_info(STREAM s, uint32 *rc4_key_size, |
434 |
uint8 **server_random, uint8 **modulus, uint8 **exponent) |
uint8 **server_random, uint8 **modulus, |
435 |
|
uint8 **exponent) |
436 |
{ |
{ |
437 |
uint32 crypt_level, random_len, rsa_info_len; |
uint32 crypt_level, random_len, rsa_info_len; |
438 |
uint16 tag, length; |
uint16 tag, length; |
439 |
uint8 *next_tag, *end; |
uint8 *next_tag, *end; |
440 |
|
|
441 |
in_uint32_le(s, *rc4_key_size); /* 1 = 40-bit, 2 = 128-bit */ |
in_uint32_le(s, *rc4_key_size); /* 1 = 40-bit, 2 = 128-bit */ |
442 |
in_uint32_le(s, crypt_level); /* 1 = low, 2 = medium, 3 = high */ |
in_uint32_le(s, crypt_level); /* 1 = low, 2 = medium, 3 = high */ |
443 |
in_uint32_le(s, random_len); |
in_uint32_le(s, random_len); |
444 |
in_uint32_le(s, rsa_info_len); |
in_uint32_le(s, rsa_info_len); |
445 |
|
|
456 |
if (end > s->end) |
if (end > s->end) |
457 |
return False; |
return False; |
458 |
|
|
459 |
in_uint8s(s, 12); /* unknown */ |
in_uint8s(s, 12); /* unknown */ |
460 |
|
|
461 |
while (s->p < end) |
while (s->p < end) |
462 |
{ |
{ |
468 |
switch (tag) |
switch (tag) |
469 |
{ |
{ |
470 |
case SEC_TAG_PUBKEY: |
case SEC_TAG_PUBKEY: |
471 |
if (!sec_parse_public_key(s, modulus, exponent)) |
if (!sec_parse_public_key |
472 |
|
(s, modulus, exponent)) |
473 |
return False; |
return False; |
474 |
|
|
475 |
break; |
break; |
497 |
uint32 rc4_key_size; |
uint32 rc4_key_size; |
498 |
|
|
499 |
if (!sec_parse_crypt_info(s, &rc4_key_size, &server_random, |
if (!sec_parse_crypt_info(s, &rc4_key_size, &server_random, |
500 |
&modulus, &exponent)) |
&modulus, &exponent)) |
501 |
return; |
return; |
502 |
|
|
503 |
/* Generate a client random, and hence determine encryption keys */ |
/* Generate a client random, and hence determine encryption keys */ |
504 |
generate_random(client_random); |
generate_random(client_random); |
505 |
sec_rsa_encrypt(sec_crypted_random, client_random, |
sec_rsa_encrypt(sec_crypted_random, client_random, |
506 |
SEC_RANDOM_SIZE, modulus, exponent); |
SEC_RANDOM_SIZE, modulus, exponent); |
507 |
sec_generate_keys(client_random, server_random, rc4_key_size); |
sec_generate_keys(client_random, server_random, rc4_key_size); |
508 |
} |
} |
509 |
|
|
513 |
uint16 tag, length; |
uint16 tag, length; |
514 |
uint8 *next_tag; |
uint8 *next_tag; |
515 |
|
|
516 |
in_uint8s(s, 23); /* header */ |
in_uint8s(s, 23); /* header */ |
517 |
|
|
518 |
while (s->p < s->end) |
while (s->p < s->end) |
519 |
{ |
{ |
561 |
|
|
562 |
if (sec_flags & SEC_ENCRYPT) |
if (sec_flags & SEC_ENCRYPT) |
563 |
{ |
{ |
564 |
in_uint8s(s, 8); /* signature */ |
in_uint8s(s, 8); /* signature */ |
565 |
sec_decrypt(s->p, s->end - s->p); |
sec_decrypt(s->p, s->end - s->p); |
566 |
} |
} |
567 |
|
|