1 |
/* |
/* |
2 |
rdesktop: A Remote Desktop Protocol client. |
rdesktop: A Remote Desktop Protocol client. |
3 |
Protocol services - RDP encryption and licensing |
Protocol services - RDP encryption and licensing |
4 |
Copyright (C) Matthew Chapman 1999-2000 |
Copyright (C) Matthew Chapman 1999-2001 |
5 |
|
|
6 |
This program is free software; you can redistribute it and/or modify |
This program is free software; you can redistribute it and/or modify |
7 |
it under the terms of the GNU General Public License as published by |
it under the terms of the GNU General Public License as published by |
19 |
*/ |
*/ |
20 |
|
|
21 |
#include "rdesktop.h" |
#include "rdesktop.h" |
22 |
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|
23 |
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#ifdef WITH_OPENSSL |
24 |
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#include <openssl/rc4.h> |
25 |
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#include <openssl/md5.h> |
26 |
|
#include <openssl/sha.h> |
27 |
|
#include <openssl/bn.h> |
28 |
|
#else |
29 |
#include "crypto/rc4.h" |
#include "crypto/rc4.h" |
30 |
#include "crypto/md5.h" |
#include "crypto/md5.h" |
31 |
#include "crypto/sha.h" |
#include "crypto/sha.h" |
32 |
#include "crypto/arith.h" |
#include "crypto/bn.h" |
33 |
|
#endif |
34 |
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|
35 |
extern char hostname[16]; |
extern char hostname[16]; |
36 |
extern int width; |
extern int width; |
37 |
extern int height; |
extern int height; |
38 |
extern int keylayout; |
extern int keylayout; |
39 |
|
extern BOOL encryption; |
40 |
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extern BOOL licence_issued; |
41 |
|
|
42 |
static int rc4_key_len; |
static int rc4_key_len; |
43 |
static RC4_KEY rc4_decrypt_key; |
static RC4_KEY rc4_decrypt_key; |
55 |
* 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. |
56 |
* Both SHA1 and MD5 algorithms are used. |
* Both SHA1 and MD5 algorithms are used. |
57 |
*/ |
*/ |
58 |
void sec_hash_48(uint8 *out, uint8 *in, uint8 *salt1, uint8 *salt2, uint8 salt) |
void |
59 |
|
sec_hash_48(uint8 *out, uint8 *in, uint8 *salt1, uint8 *salt2, uint8 salt) |
60 |
{ |
{ |
61 |
uint8 shasig[20]; |
uint8 shasig[20]; |
62 |
uint8 pad[4]; |
uint8 pad[4]; |
66 |
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|
67 |
for (i = 0; i < 3; i++) |
for (i = 0; i < 3; i++) |
68 |
{ |
{ |
69 |
memset(pad, salt+i, i+1); |
memset(pad, salt + i, i + 1); |
70 |
|
|
71 |
SHA1_Init(&sha); |
SHA1_Init(&sha); |
72 |
SHA1_Update(&sha, pad, i+1); |
SHA1_Update(&sha, pad, i + 1); |
73 |
SHA1_Update(&sha, in, 48); |
SHA1_Update(&sha, in, 48); |
74 |
SHA1_Update(&sha, salt1, 32); |
SHA1_Update(&sha, salt1, 32); |
75 |
SHA1_Update(&sha, salt2, 32); |
SHA1_Update(&sha, salt2, 32); |
78 |
MD5_Init(&md5); |
MD5_Init(&md5); |
79 |
MD5_Update(&md5, in, 48); |
MD5_Update(&md5, in, 48); |
80 |
MD5_Update(&md5, shasig, 20); |
MD5_Update(&md5, shasig, 20); |
81 |
MD5_Final(&out[i*16], &md5); |
MD5_Final(&out[i * 16], &md5); |
82 |
} |
} |
83 |
} |
} |
84 |
|
|
86 |
* Weaker 16-byte transformation, also using two 32-byte salts, but |
* Weaker 16-byte transformation, also using two 32-byte salts, but |
87 |
* only using a single round of MD5. |
* only using a single round of MD5. |
88 |
*/ |
*/ |
89 |
void sec_hash_16(uint8 *out, uint8 *in, uint8 *salt1, uint8 *salt2) |
void |
90 |
|
sec_hash_16(uint8 *out, uint8 *in, uint8 *salt1, uint8 *salt2) |
91 |
{ |
{ |
92 |
MD5_CTX md5; |
MD5_CTX md5; |
93 |
|
|
99 |
} |
} |
100 |
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|
101 |
/* Reduce key entropy from 64 to 40 bits */ |
/* Reduce key entropy from 64 to 40 bits */ |
102 |
static void sec_make_40bit(uint8 *key) |
static void |
103 |
|
sec_make_40bit(uint8 *key) |
104 |
{ |
{ |
105 |
key[0] = 0xd1; |
key[0] = 0xd1; |
106 |
key[1] = 0x26; |
key[1] = 0x26; |
108 |
} |
} |
109 |
|
|
110 |
/* Generate a session key and RC4 keys, given client and server randoms */ |
/* Generate a session key and RC4 keys, given client and server randoms */ |
111 |
static void sec_generate_keys(uint8 *client_key, uint8 *server_key, |
static void |
112 |
int rc4_key_size) |
sec_generate_keys(uint8 *client_key, uint8 *server_key, int rc4_key_size) |
113 |
{ |
{ |
114 |
uint8 session_key[48]; |
uint8 session_key[48]; |
115 |
uint8 temp_hash[48]; |
uint8 temp_hash[48]; |
116 |
uint8 input[48]; |
uint8 input[48]; |
117 |
|
|
118 |
/* Construct input data to hash */ |
/* Construct input data to hash */ |
119 |
memcpy(input, client_key, 24); |
memcpy(input, client_key, 24); |
120 |
memcpy(input+24, server_key, 24); |
memcpy(input + 24, server_key, 24); |
121 |
|
|
122 |
/* Generate session key - two rounds of sec_hash_48 */ |
/* Generate session key - two rounds of sec_hash_48 */ |
123 |
sec_hash_48(temp_hash, input, client_key, server_key, 65); |
sec_hash_48(temp_hash, input, client_key, server_key, 65); |
124 |
sec_hash_48(session_key, temp_hash, client_key, server_key, 88); |
sec_hash_48(session_key, temp_hash, client_key, server_key, 88); |
125 |
|
|
126 |
/* Store first 8 bytes of session key, for generating signatures */ |
/* Store first 8 bytes of session key, for generating signatures */ |
127 |
memcpy(sec_sign_key, session_key, 8); |
memcpy(sec_sign_key, session_key, 8); |
128 |
|
|
129 |
/* Generate RC4 keys */ |
/* Generate RC4 keys */ |
130 |
sec_hash_16(sec_decrypt_key, &session_key[16], client_key, server_key); |
sec_hash_16(sec_decrypt_key, &session_key[16], client_key, |
131 |
sec_hash_16(sec_encrypt_key, &session_key[32], client_key, server_key); |
server_key); |
132 |
|
sec_hash_16(sec_encrypt_key, &session_key[32], client_key, |
133 |
|
server_key); |
134 |
|
|
135 |
if (rc4_key_size == 1) |
if (rc4_key_size == 1) |
136 |
{ |
{ |
137 |
DEBUG("40-bit encryption enabled\n"); |
DEBUG(("40-bit encryption enabled\n")); |
138 |
sec_make_40bit(sec_sign_key); |
sec_make_40bit(sec_sign_key); |
139 |
sec_make_40bit(sec_decrypt_key); |
sec_make_40bit(sec_decrypt_key); |
140 |
sec_make_40bit(sec_encrypt_key); |
sec_make_40bit(sec_encrypt_key); |
142 |
} |
} |
143 |
else |
else |
144 |
{ |
{ |
145 |
DEBUG("128-bit encryption enabled\n"); |
DEBUG(("128-bit encryption enabled\n")); |
146 |
rc4_key_len = 16; |
rc4_key_len = 16; |
147 |
} |
} |
148 |
|
|
155 |
RC4_set_key(&rc4_encrypt_key, rc4_key_len, sec_encrypt_key); |
RC4_set_key(&rc4_encrypt_key, rc4_key_len, sec_encrypt_key); |
156 |
} |
} |
157 |
|
|
158 |
static uint8 pad_54[40] = |
static uint8 pad_54[40] = { |
159 |
{ |
54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, 54, |
160 |
54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54,54, |
54, 54, 54, |
161 |
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, |
162 |
|
54, 54, 54 |
163 |
}; |
}; |
164 |
|
|
165 |
static uint8 pad_92[48] = |
static uint8 pad_92[48] = { |
166 |
{ |
92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, 92, |
167 |
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, |
168 |
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, |
169 |
|
92, 92, 92, 92, 92, 92, 92 |
170 |
}; |
}; |
171 |
|
|
172 |
/* Output a uint32 into a buffer (little-endian) */ |
/* Output a uint32 into a buffer (little-endian) */ |
173 |
void buf_out_uint32(uint8 *buffer, uint32 value) |
void |
174 |
|
buf_out_uint32(uint8 *buffer, uint32 value) |
175 |
{ |
{ |
176 |
buffer[0] = (value) & 0xff; |
buffer[0] = (value) & 0xff; |
177 |
buffer[1] = (value >> 8) & 0xff; |
buffer[1] = (value >> 8) & 0xff; |
180 |
} |
} |
181 |
|
|
182 |
/* Generate a signature hash, using a combination of SHA1 and MD5 */ |
/* Generate a signature hash, using a combination of SHA1 and MD5 */ |
183 |
void sec_sign(uint8 *signature, uint8 *session_key, int length, |
void |
184 |
uint8 *data, int datalen) |
sec_sign(uint8 *signature, uint8 *session_key, int length, |
185 |
|
uint8 *data, int datalen) |
186 |
{ |
{ |
187 |
uint8 shasig[20]; |
uint8 shasig[20]; |
188 |
uint8 md5sig[16]; |
uint8 md5sig[16]; |
190 |
SHA_CTX sha; |
SHA_CTX sha; |
191 |
MD5_CTX md5; |
MD5_CTX md5; |
192 |
|
|
193 |
buf_out_uint32(lenhdr, datalen); |
buf_out_uint32(lenhdr, datalen); |
194 |
|
|
195 |
SHA1_Init(&sha); |
SHA1_Init(&sha); |
196 |
SHA1_Update(&sha, session_key, length); |
SHA1_Update(&sha, session_key, length); |
209 |
} |
} |
210 |
|
|
211 |
/* Update an encryption key - similar to the signing process */ |
/* Update an encryption key - similar to the signing process */ |
212 |
static void sec_update(uint8 *key, uint8 *update_key) |
static void |
213 |
|
sec_update(uint8 *key, uint8 *update_key) |
214 |
{ |
{ |
215 |
uint8 shasig[20]; |
uint8 shasig[20]; |
216 |
SHA_CTX sha; |
SHA_CTX sha; |
237 |
} |
} |
238 |
|
|
239 |
/* Encrypt data using RC4 */ |
/* Encrypt data using RC4 */ |
240 |
static void sec_encrypt(uint8 *data, int length) |
static void |
241 |
|
sec_encrypt(uint8 *data, int length) |
242 |
{ |
{ |
243 |
static int use_count; |
static int use_count; |
244 |
|
|
254 |
} |
} |
255 |
|
|
256 |
/* Decrypt data using RC4 */ |
/* Decrypt data using RC4 */ |
257 |
static void sec_decrypt(uint8 *data, int length) |
static void |
258 |
|
sec_decrypt(uint8 *data, int length) |
259 |
{ |
{ |
260 |
static int use_count; |
static int use_count; |
261 |
|
|
270 |
use_count++; |
use_count++; |
271 |
} |
} |
272 |
|
|
273 |
/* Read in a NUMBER from a buffer */ |
static void |
274 |
static void sec_read_number(NUMBER *num, uint8 *buffer, int len) |
reverse(uint8 *p, int len) |
275 |
{ |
{ |
|
INT *data = num->n_part; |
|
276 |
int i, j; |
int i, j; |
277 |
|
uint8 temp; |
278 |
|
|
279 |
for (i = 0, j = 0; j < len; i++, j += 2) |
for (i = 0, j = len-1; i < j; i++, j--) |
|
data[i] = buffer[j] | (buffer[j+1] << 8); |
|
|
|
|
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num->n_len = i; |
|
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} |
|
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|
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/* Write a NUMBER to a buffer */ |
|
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static void sec_write_number(NUMBER *num, uint8 *buffer, int len) |
|
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{ |
|
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INT *data = num->n_part; |
|
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int i, j; |
|
|
|
|
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for (i = 0, j = 0; j < len; i++, j += 2) |
|
280 |
{ |
{ |
281 |
buffer[j] = data[i] & 0xff; |
temp = p[i]; |
282 |
buffer[j+1] = data[i] >> 8; |
p[i] = p[j]; |
283 |
|
p[j] = temp; |
284 |
} |
} |
285 |
} |
} |
286 |
|
|
287 |
/* Perform an RSA public key encryption operation */ |
/* Perform an RSA public key encryption operation */ |
288 |
static void sec_rsa_encrypt(uint8 *out, uint8 *in, int len, |
static void |
289 |
uint8 *modulus, uint8 *exponent) |
sec_rsa_encrypt(uint8 *out, uint8 *in, int len, |
290 |
{ |
uint8 *modulus, uint8 *exponent) |
291 |
NUMBER data, key; |
{ |
292 |
|
BN_CTX ctx; |
293 |
/* Set modulus for arithmetic */ |
BIGNUM mod, exp, x, y; |
294 |
sec_read_number(&key, modulus, SEC_MODULUS_SIZE); |
uint8 inr[SEC_MODULUS_SIZE]; |
295 |
m_init(&key, NULL); |
int outlen; |
296 |
|
|
297 |
/* Exponentiate */ |
reverse(modulus, SEC_MODULUS_SIZE); |
298 |
sec_read_number(&data, in, len); |
reverse(exponent, SEC_EXPONENT_SIZE); |
299 |
sec_read_number(&key, exponent, SEC_EXPONENT_SIZE); |
memcpy(inr, in, len); |
300 |
m_exp(&data, &key, &data); |
reverse(inr, len); |
301 |
sec_write_number(&data, out, SEC_MODULUS_SIZE); |
|
302 |
|
BN_CTX_init(&ctx); |
303 |
|
BN_init(&mod); |
304 |
|
BN_init(&exp); |
305 |
|
BN_init(&x); |
306 |
|
BN_init(&y); |
307 |
|
|
308 |
|
BN_bin2bn(modulus, SEC_MODULUS_SIZE, &mod); |
309 |
|
BN_bin2bn(exponent, SEC_EXPONENT_SIZE, &exp); |
310 |
|
BN_bin2bn(inr, len, &x); |
311 |
|
BN_mod_exp(&y, &x, &exp, &mod, &ctx); |
312 |
|
outlen = BN_bn2bin(&y, out); |
313 |
|
reverse(out, outlen); |
314 |
|
if (outlen < SEC_MODULUS_SIZE) |
315 |
|
memset(out+outlen, 0, SEC_MODULUS_SIZE-outlen); |
316 |
|
|
317 |
|
BN_free(&y); |
318 |
|
BN_clear_free(&x); |
319 |
|
BN_free(&exp); |
320 |
|
BN_free(&mod); |
321 |
|
BN_CTX_free(&ctx); |
322 |
} |
} |
323 |
|
|
324 |
/* Initialise secure transport packet */ |
/* Initialise secure transport packet */ |
325 |
STREAM sec_init(uint32 flags, int maxlen) |
STREAM |
326 |
|
sec_init(uint32 flags, int maxlen) |
327 |
{ |
{ |
328 |
int hdrlen; |
int hdrlen; |
329 |
STREAM s; |
STREAM s; |
330 |
|
|
331 |
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 4; |
if (!licence_issued) |
332 |
s = mcs_init(maxlen + hdrlen); |
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 4; |
333 |
|
else |
334 |
|
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 0; |
335 |
|
s = mcs_init(maxlen + hdrlen); |
336 |
s_push_layer(s, sec_hdr, hdrlen); |
s_push_layer(s, sec_hdr, hdrlen); |
337 |
|
|
338 |
return s; |
return s; |
339 |
} |
} |
340 |
|
|
341 |
/* Transmit secure transport packet */ |
/* Transmit secure transport packet */ |
342 |
void sec_send(STREAM s, uint32 flags) |
void |
343 |
|
sec_send(STREAM s, uint32 flags) |
344 |
{ |
{ |
345 |
int datalen; |
int datalen; |
346 |
|
|
347 |
s_pop_layer(s, sec_hdr); |
s_pop_layer(s, sec_hdr); |
348 |
out_uint32_le(s, flags); |
if (!licence_issued || (flags & SEC_ENCRYPT)) |
349 |
|
out_uint32_le(s, flags); |
350 |
|
|
351 |
if (flags & SEC_ENCRYPT) |
if (flags & SEC_ENCRYPT) |
352 |
{ |
{ |
353 |
flags &= ~SEC_ENCRYPT; |
flags &= ~SEC_ENCRYPT; |
354 |
datalen = s->end - s->p - 8; |
datalen = s->end - s->p - 8; |
355 |
|
|
356 |
#if RDP_DEBUG |
#if WITH_DEBUG |
357 |
DEBUG("Sending encrypted packet:\n"); |
DEBUG(("Sending encrypted packet:\n")); |
358 |
hexdump(s->p+8, datalen); |
hexdump(s->p + 8, datalen); |
359 |
#endif |
#endif |
360 |
|
|
361 |
sec_sign(s->p, sec_sign_key, 8, s->p+8, datalen); |
sec_sign(s->p, sec_sign_key, 8, s->p + 8, datalen); |
362 |
sec_encrypt(s->p+8, datalen); |
sec_encrypt(s->p + 8, datalen); |
363 |
} |
} |
364 |
|
|
365 |
mcs_send(s); |
mcs_send(s); |
366 |
} |
} |
367 |
|
|
368 |
/* Transfer the client random to the server */ |
/* Transfer the client random to the server */ |
369 |
static void sec_establish_key() |
static void |
370 |
|
sec_establish_key() |
371 |
{ |
{ |
372 |
uint32 length = SEC_MODULUS_SIZE + SEC_PADDING_SIZE; |
uint32 length = SEC_MODULUS_SIZE + SEC_PADDING_SIZE; |
373 |
uint32 flags = SEC_CLIENT_RANDOM; |
uint32 flags = SEC_CLIENT_RANDOM; |
384 |
} |
} |
385 |
|
|
386 |
/* Output connect initial data blob */ |
/* Output connect initial data blob */ |
387 |
static void sec_out_mcs_data(STREAM s) |
static void |
388 |
|
sec_out_mcs_data(STREAM s) |
389 |
{ |
{ |
390 |
int hostlen = 2 * strlen(hostname); |
int hostlen = 2 * strlen(hostname); |
391 |
|
|
394 |
out_uint8(s, 0x7c); |
out_uint8(s, 0x7c); |
395 |
out_uint16_be(s, 1); |
out_uint16_be(s, 1); |
396 |
|
|
397 |
out_uint16_be(s, (158 | 0x8000)); /* remaining length */ |
out_uint16_be(s, (158 | 0x8000)); /* remaining length */ |
398 |
|
|
399 |
out_uint16_be(s, 8); /* length? */ |
out_uint16_be(s, 8); /* length? */ |
400 |
out_uint16_be(s, 16); |
out_uint16_be(s, 16); |
402 |
out_uint16_le(s, 0xc001); |
out_uint16_le(s, 0xc001); |
403 |
out_uint8(s, 0); |
out_uint8(s, 0); |
404 |
|
|
405 |
out_uint32_le(s, 0x61637544); /* "Duca" ?! */ |
out_uint32_le(s, 0x61637544); /* "Duca" ?! */ |
406 |
out_uint16_be(s, (144 | 0x8000)); /* remaining length */ |
out_uint16_be(s, (144 | 0x8000)); /* remaining length */ |
407 |
|
|
408 |
/* Client information */ |
/* Client information */ |
409 |
out_uint16_le(s, SEC_TAG_CLI_INFO); |
out_uint16_le(s, SEC_TAG_CLI_INFO); |
415 |
out_uint16_le(s, 0xca01); |
out_uint16_le(s, 0xca01); |
416 |
out_uint16_le(s, 0xaa03); |
out_uint16_le(s, 0xaa03); |
417 |
out_uint32_le(s, keylayout); |
out_uint32_le(s, keylayout); |
418 |
out_uint32_le(s, 419); /* client build? we are 419 compatible :-) */ |
out_uint32_le(s, 419); /* client build? we are 419 compatible :-) */ |
419 |
|
|
420 |
/* Unicode name of client, padded to 32 bytes */ |
/* Unicode name of client, padded to 32 bytes */ |
421 |
rdp_out_unistr(s, hostname, hostlen); |
rdp_out_unistr(s, hostname, hostlen); |
422 |
out_uint8s(s, 30-hostlen); |
out_uint8s(s, 30 - hostlen); |
423 |
|
|
424 |
out_uint32_le(s, 4); |
out_uint32_le(s, 4); |
425 |
out_uint32(s, 0); |
out_uint32(s, 0); |
426 |
out_uint32_le(s, 12); |
out_uint32_le(s, 12); |
427 |
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */ |
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */ |
428 |
|
|
429 |
out_uint16(s, 0xca01); |
out_uint16(s, 0xca01); |
430 |
out_uint16(s, 0); |
out_uint16(s, 0); |
432 |
/* Client encryption settings */ |
/* Client encryption settings */ |
433 |
out_uint16_le(s, SEC_TAG_CLI_CRYPT); |
out_uint16_le(s, SEC_TAG_CLI_CRYPT); |
434 |
out_uint16(s, 8); /* length */ |
out_uint16(s, 8); /* length */ |
435 |
out_uint32_le(s, 1); /* encryption enabled */ |
out_uint32_le(s, encryption ? 1 : 0); /* encryption enabled */ |
436 |
s_mark_end(s); |
s_mark_end(s); |
437 |
} |
} |
438 |
|
|
439 |
/* Parse a public key structure */ |
/* Parse a public key structure */ |
440 |
static BOOL sec_parse_public_key(STREAM s, uint8 **modulus, uint8 **exponent) |
static BOOL |
441 |
|
sec_parse_public_key(STREAM s, uint8 **modulus, uint8 **exponent) |
442 |
{ |
{ |
443 |
uint32 magic, modulus_len; |
uint32 magic, modulus_len; |
444 |
|
|
445 |
in_uint32_le(s, magic); |
in_uint32_le(s, magic); |
446 |
if (magic != SEC_RSA_MAGIC) |
if (magic != SEC_RSA_MAGIC) |
447 |
{ |
{ |
448 |
ERROR("RSA magic 0x%x\n", magic); |
error("RSA magic 0x%x\n", magic); |
449 |
return False; |
return False; |
450 |
} |
} |
451 |
|
|
452 |
in_uint32_le(s, modulus_len); |
in_uint32_le(s, modulus_len); |
453 |
if (modulus_len != SEC_MODULUS_SIZE + SEC_PADDING_SIZE) |
if (modulus_len != SEC_MODULUS_SIZE + SEC_PADDING_SIZE) |
454 |
{ |
{ |
455 |
ERROR("modulus len 0x%x\n", modulus_len); |
error("modulus len 0x%x\n", modulus_len); |
456 |
return False; |
return False; |
457 |
} |
} |
458 |
|
|
459 |
in_uint8s(s, 8); /* modulus_bits, unknown */ |
in_uint8s(s, 8); /* modulus_bits, unknown */ |
460 |
in_uint8p(s, *exponent, SEC_EXPONENT_SIZE); |
in_uint8p(s, *exponent, SEC_EXPONENT_SIZE); |
461 |
in_uint8p(s, *modulus, SEC_MODULUS_SIZE); |
in_uint8p(s, *modulus, SEC_MODULUS_SIZE); |
462 |
in_uint8s(s, SEC_PADDING_SIZE); |
in_uint8s(s, SEC_PADDING_SIZE); |
465 |
} |
} |
466 |
|
|
467 |
/* Parse a crypto information structure */ |
/* Parse a crypto information structure */ |
468 |
static BOOL sec_parse_crypt_info(STREAM s, uint32 *rc4_key_size, |
static BOOL |
469 |
uint8 **server_random, uint8 **modulus, uint8 **exponent) |
sec_parse_crypt_info(STREAM s, uint32 *rc4_key_size, |
470 |
|
uint8 **server_random, uint8 **modulus, uint8 **exponent) |
471 |
{ |
{ |
472 |
uint32 crypt_level, random_len, rsa_info_len; |
uint32 crypt_level, random_len, rsa_info_len; |
473 |
uint16 tag, length; |
uint16 tag, length; |
474 |
uint8 *next_tag, *end; |
uint8 *next_tag, *end; |
475 |
|
|
476 |
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 */ |
477 |
in_uint32_le(s, crypt_level); /* 1 = low, 2 = medium, 3 = high */ |
in_uint32_le(s, crypt_level); /* 1 = low, 2 = medium, 3 = high */ |
478 |
in_uint32_le(s, random_len); |
in_uint32_le(s, random_len); |
479 |
in_uint32_le(s, rsa_info_len); |
in_uint32_le(s, rsa_info_len); |
480 |
|
|
481 |
if (random_len != SEC_RANDOM_SIZE) |
if (random_len != SEC_RANDOM_SIZE) |
482 |
{ |
{ |
483 |
ERROR("random len %d\n", random_len); |
error("random len %d\n", random_len); |
484 |
return False; |
return False; |
485 |
} |
} |
486 |
|
|
491 |
if (end > s->end) |
if (end > s->end) |
492 |
return False; |
return False; |
493 |
|
|
494 |
in_uint8s(s, 12); /* unknown */ |
in_uint8s(s, 12); /* unknown */ |
495 |
|
|
496 |
while (s->p < end) |
while (s->p < end) |
497 |
{ |
{ |
503 |
switch (tag) |
switch (tag) |
504 |
{ |
{ |
505 |
case SEC_TAG_PUBKEY: |
case SEC_TAG_PUBKEY: |
506 |
if (!sec_parse_public_key(s, modulus, exponent)) |
if (!sec_parse_public_key |
507 |
|
(s, modulus, exponent)) |
508 |
return False; |
return False; |
509 |
|
|
510 |
break; |
break; |
515 |
break; |
break; |
516 |
|
|
517 |
default: |
default: |
518 |
NOTIMP("crypt tag 0x%x\n", tag); |
unimpl("crypt tag 0x%x\n", tag); |
519 |
} |
} |
520 |
|
|
521 |
s->p = next_tag; |
s->p = next_tag; |
525 |
} |
} |
526 |
|
|
527 |
/* Process crypto information blob */ |
/* Process crypto information blob */ |
528 |
static void sec_process_crypt_info(STREAM s) |
static void |
529 |
|
sec_process_crypt_info(STREAM s) |
530 |
{ |
{ |
531 |
uint8 *server_random, *modulus, *exponent; |
uint8 *server_random, *modulus, *exponent; |
532 |
uint8 client_random[SEC_RANDOM_SIZE]; |
uint8 client_random[SEC_RANDOM_SIZE]; |
533 |
uint32 rc4_key_size; |
uint32 rc4_key_size; |
534 |
|
|
535 |
if (!sec_parse_crypt_info(s, &rc4_key_size, &server_random, |
if (!sec_parse_crypt_info(s, &rc4_key_size, &server_random, |
536 |
&modulus, &exponent)) |
&modulus, &exponent)) |
537 |
return; |
return; |
538 |
|
|
539 |
/* Generate a client random, and hence determine encryption keys */ |
/* Generate a client random, and hence determine encryption keys */ |
540 |
generate_random(client_random); |
generate_random(client_random); |
541 |
sec_rsa_encrypt(sec_crypted_random, client_random, |
sec_rsa_encrypt(sec_crypted_random, client_random, |
542 |
SEC_RANDOM_SIZE, modulus, exponent); |
SEC_RANDOM_SIZE, modulus, exponent); |
543 |
sec_generate_keys(client_random, server_random, rc4_key_size); |
sec_generate_keys(client_random, server_random, rc4_key_size); |
544 |
} |
} |
545 |
|
|
546 |
/* Process connect response data blob */ |
/* Process connect response data blob */ |
547 |
static void sec_process_mcs_data(STREAM s) |
static void |
548 |
|
sec_process_mcs_data(STREAM s) |
549 |
{ |
{ |
550 |
uint16 tag, length; |
uint16 tag, length; |
551 |
uint8 *next_tag; |
uint8 *next_tag; |
552 |
|
|
553 |
in_uint8s(s, 23); /* header */ |
in_uint8s(s, 23); /* header */ |
554 |
|
|
555 |
while (s->p < s->end) |
while (s->p < s->end) |
556 |
{ |
{ |
573 |
break; |
break; |
574 |
|
|
575 |
default: |
default: |
576 |
NOTIMP("response tag 0x%x\n", tag); |
unimpl("response tag 0x%x\n", tag); |
577 |
} |
} |
578 |
|
|
579 |
s->p = next_tag; |
s->p = next_tag; |
581 |
} |
} |
582 |
|
|
583 |
/* Receive secure transport packet */ |
/* Receive secure transport packet */ |
584 |
STREAM sec_recv() |
STREAM |
585 |
|
sec_recv() |
586 |
{ |
{ |
587 |
uint32 sec_flags; |
uint32 sec_flags; |
588 |
STREAM s; |
STREAM s; |
589 |
|
|
590 |
while ((s = mcs_recv()) != NULL) |
while ((s = mcs_recv()) != NULL) |
591 |
{ |
{ |
592 |
in_uint32_le(s, sec_flags); |
if (encryption || !licence_issued) |
|
|
|
|
if (sec_flags & SEC_LICENCE_NEG) |
|
593 |
{ |
{ |
594 |
licence_process(s); |
in_uint32_le(s, sec_flags); |
|
continue; |
|
|
} |
|
595 |
|
|
596 |
if (sec_flags & SEC_ENCRYPT) |
if (sec_flags & SEC_LICENCE_NEG) |
597 |
{ |
{ |
598 |
in_uint8s(s, 8); /* signature */ |
licence_process(s); |
599 |
sec_decrypt(s->p, s->end - s->p); |
continue; |
600 |
|
} |
601 |
|
|
602 |
|
if (sec_flags & SEC_ENCRYPT) |
603 |
|
{ |
604 |
|
in_uint8s(s, 8); /* signature */ |
605 |
|
sec_decrypt(s->p, s->end - s->p); |
606 |
|
} |
607 |
} |
} |
608 |
|
|
609 |
return s; |
return s; |
613 |
} |
} |
614 |
|
|
615 |
/* Establish a secure connection */ |
/* Establish a secure connection */ |
616 |
BOOL sec_connect(char *server) |
BOOL |
617 |
|
sec_connect(char *server) |
618 |
{ |
{ |
619 |
struct stream mcs_data; |
struct stream mcs_data; |
620 |
|
|
627 |
return False; |
return False; |
628 |
|
|
629 |
sec_process_mcs_data(&mcs_data); |
sec_process_mcs_data(&mcs_data); |
630 |
sec_establish_key(); |
if (encryption) |
631 |
|
sec_establish_key(); |
632 |
return True; |
return True; |
633 |
} |
} |
634 |
|
|
635 |
/* Disconnect a connection */ |
/* Disconnect a connection */ |
636 |
void sec_disconnect() |
void |
637 |
|
sec_disconnect() |
638 |
{ |
{ |
639 |
mcs_disconnect(); |
mcs_disconnect(); |
640 |
} |
} |