34 |
#endif |
#endif |
35 |
|
|
36 |
extern char hostname[16]; |
extern char hostname[16]; |
37 |
extern int width; |
extern int g_width; |
38 |
extern int height; |
extern int g_height; |
39 |
extern int keylayout; |
extern int keylayout; |
40 |
extern BOOL encryption; |
extern BOOL g_encryption; |
41 |
extern BOOL g_licence_issued; |
extern BOOL g_licence_issued; |
42 |
extern BOOL use_rdp5; |
extern BOOL g_use_rdp5; |
43 |
extern int server_bpp; |
extern BOOL g_console_session; |
44 |
|
extern int g_server_bpp; |
45 |
extern uint16 mcs_userid; |
extern uint16 mcs_userid; |
46 |
extern VCHANNEL g_channels[]; |
extern VCHANNEL g_channels[]; |
47 |
extern unsigned int g_num_channels; |
extern unsigned int g_num_channels; |
58 |
static uint8 sec_encrypt_update_key[16]; |
static uint8 sec_encrypt_update_key[16]; |
59 |
static uint8 sec_crypted_random[SEC_MODULUS_SIZE]; |
static uint8 sec_crypted_random[SEC_MODULUS_SIZE]; |
60 |
|
|
61 |
uint16 server_rdp_version = 0; |
uint16 g_server_rdp_version = 0; |
62 |
|
|
63 |
/* |
/* |
64 |
* General purpose 48-byte transformation, using two 32-byte salts (generally, |
* I believe this is based on SSLv3 with the following differences: |
65 |
* a client and server salt) and a global salt value used for padding. |
* MAC algorithm (5.2.3.1) uses only 32-bit length in place of seq_num/type/length fields |
66 |
|
* MAC algorithm uses SHA1 and MD5 for the two hash functions instead of one or other |
67 |
|
* key_block algorithm (6.2.2) uses 'X', 'YY', 'ZZZ' instead of 'A', 'BB', 'CCC' |
68 |
|
* key_block partitioning is different (16 bytes each: MAC secret, decrypt key, encrypt key) |
69 |
|
* encryption/decryption keys updated every 4096 packets |
70 |
|
* See http://wp.netscape.com/eng/ssl3/draft302.txt |
71 |
|
*/ |
72 |
|
|
73 |
|
/* |
74 |
|
* 48-byte transformation used to generate master secret (6.1) and key material (6.2.2). |
75 |
* Both SHA1 and MD5 algorithms are used. |
* Both SHA1 and MD5 algorithms are used. |
76 |
*/ |
*/ |
77 |
void |
void |
102 |
} |
} |
103 |
|
|
104 |
/* |
/* |
105 |
* Weaker 16-byte transformation, also using two 32-byte salts, but |
* 16-byte transformation used to generate export keys (6.2.2). |
|
* only using a single round of MD5. |
|
106 |
*/ |
*/ |
107 |
void |
void |
108 |
sec_hash_16(uint8 * out, uint8 * in, uint8 * salt1, uint8 * salt2) |
sec_hash_16(uint8 * out, uint8 * in, uint8 * salt1, uint8 * salt2) |
125 |
key[2] = 0x9e; |
key[2] = 0x9e; |
126 |
} |
} |
127 |
|
|
128 |
/* Generate a session key and RC4 keys, given client and server randoms */ |
/* Generate encryption keys given client and server randoms */ |
129 |
static void |
static void |
130 |
sec_generate_keys(uint8 * client_key, uint8 * server_key, int rc4_key_size) |
sec_generate_keys(uint8 * client_random, uint8 * server_random, int rc4_key_size) |
131 |
{ |
{ |
132 |
uint8 session_key[48]; |
uint8 pre_master_secret[48]; |
133 |
uint8 temp_hash[48]; |
uint8 master_secret[48]; |
134 |
uint8 input[48]; |
uint8 key_block[48]; |
135 |
|
|
136 |
/* Construct input data to hash */ |
/* Construct pre-master secret */ |
137 |
memcpy(input, client_key, 24); |
memcpy(pre_master_secret, client_random, 24); |
138 |
memcpy(input + 24, server_key, 24); |
memcpy(pre_master_secret + 24, server_random, 24); |
139 |
|
|
140 |
/* Generate session key - two rounds of sec_hash_48 */ |
/* Generate master secret and then key material */ |
141 |
sec_hash_48(temp_hash, input, client_key, server_key, 65); |
sec_hash_48(master_secret, pre_master_secret, client_random, server_random, 'A'); |
142 |
sec_hash_48(session_key, temp_hash, client_key, server_key, 88); |
sec_hash_48(key_block, master_secret, client_random, server_random, 'X'); |
143 |
|
|
144 |
/* Store first 16 bytes of session key, for generating signatures */ |
/* First 16 bytes of key material is MAC secret */ |
145 |
memcpy(sec_sign_key, session_key, 16); |
memcpy(sec_sign_key, key_block, 16); |
146 |
|
|
147 |
/* Generate RC4 keys */ |
/* Generate export keys from next two blocks of 16 bytes */ |
148 |
sec_hash_16(sec_decrypt_key, &session_key[16], client_key, server_key); |
sec_hash_16(sec_decrypt_key, &key_block[16], client_random, server_random); |
149 |
sec_hash_16(sec_encrypt_key, &session_key[32], client_key, server_key); |
sec_hash_16(sec_encrypt_key, &key_block[32], client_random, server_random); |
150 |
|
|
151 |
if (rc4_key_size == 1) |
if (rc4_key_size == 1) |
152 |
{ |
{ |
195 |
buffer[3] = (value >> 24) & 0xff; |
buffer[3] = (value >> 24) & 0xff; |
196 |
} |
} |
197 |
|
|
198 |
/* Generate a signature hash, using a combination of SHA1 and MD5 */ |
/* Generate a MAC hash (5.2.3.1), using a combination of SHA1 and MD5 */ |
199 |
void |
void |
200 |
sec_sign(uint8 * signature, int siglen, uint8 * session_key, int keylen, uint8 * data, int datalen) |
sec_sign(uint8 * signature, int siglen, uint8 * session_key, int keylen, uint8 * data, int datalen) |
201 |
{ |
{ |
223 |
memcpy(signature, md5sig, siglen); |
memcpy(signature, md5sig, siglen); |
224 |
} |
} |
225 |
|
|
226 |
/* Update an encryption key - similar to the signing process */ |
/* Update an encryption key */ |
227 |
static void |
static void |
228 |
sec_update(uint8 * key, uint8 * update_key) |
sec_update(uint8 * key, uint8 * update_key) |
229 |
{ |
{ |
415 |
unsigned int i; |
unsigned int i; |
416 |
|
|
417 |
if (g_num_channels > 0) |
if (g_num_channels > 0) |
418 |
length += g_num_channels*12 + 8; |
length += g_num_channels * 12 + 8; |
419 |
|
|
420 |
if (hostlen > 30) |
if (hostlen > 30) |
421 |
hostlen = 30; |
hostlen = 30; |
422 |
|
|
423 |
out_uint16_be(s, 5); /* unknown */ |
/* Generic Conference Control (T.124) ConferenceCreateRequest */ |
424 |
|
out_uint16_be(s, 5); |
425 |
out_uint16_be(s, 0x14); |
out_uint16_be(s, 0x14); |
426 |
out_uint8(s, 0x7c); |
out_uint8(s, 0x7c); |
427 |
out_uint16_be(s, 1); |
out_uint16_be(s, 1); |
434 |
out_uint16_le(s, 0xc001); |
out_uint16_le(s, 0xc001); |
435 |
out_uint8(s, 0); |
out_uint8(s, 0); |
436 |
|
|
437 |
out_uint32_le(s, 0x61637544); /* "Duca" ?! */ |
out_uint32_le(s, 0x61637544); /* OEM ID: "Duca", as in Ducati. */ |
438 |
out_uint16_be(s, ((length - 14) | 0x8000)); /* remaining length */ |
out_uint16_be(s, ((length - 14) | 0x8000)); /* remaining length */ |
439 |
|
|
440 |
/* Client information */ |
/* Client information */ |
441 |
out_uint16_le(s, SEC_TAG_CLI_INFO); |
out_uint16_le(s, SEC_TAG_CLI_INFO); |
442 |
out_uint16_le(s, 212); /* length */ |
out_uint16_le(s, 212); /* length */ |
443 |
out_uint16_le(s, use_rdp5 ? 4 : 1); /* RDP version. 1 == RDP4, 4 == RDP5. */ |
out_uint16_le(s, g_use_rdp5 ? 4 : 1); /* RDP version. 1 == RDP4, 4 == RDP5. */ |
444 |
out_uint16_le(s, 8); |
out_uint16_le(s, 8); |
445 |
out_uint16_le(s, width); |
out_uint16_le(s, g_width); |
446 |
out_uint16_le(s, height); |
out_uint16_le(s, g_height); |
447 |
out_uint16_le(s, 0xca01); |
out_uint16_le(s, 0xca01); |
448 |
out_uint16_le(s, 0xaa03); |
out_uint16_le(s, 0xaa03); |
449 |
out_uint32_le(s, keylayout); |
out_uint32_le(s, keylayout); |
457 |
out_uint32(s, 0); |
out_uint32(s, 0); |
458 |
out_uint32_le(s, 12); |
out_uint32_le(s, 12); |
459 |
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */ |
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */ |
460 |
|
out_uint16_le(s, 0xca01); /* colour depth? */ |
|
switch (server_bpp) |
|
|
{ |
|
|
case 8: |
|
|
out_uint16_le(s, 0xca01); |
|
|
break; |
|
|
case 15: |
|
|
out_uint16_le(s, 0xca02); |
|
|
break; |
|
|
case 16: |
|
|
out_uint16_le(s, 0xca03); |
|
|
break; |
|
|
case 24: |
|
|
out_uint16_le(s, 0xca04); |
|
|
break; |
|
|
} |
|
461 |
out_uint16_le(s, 1); |
out_uint16_le(s, 1); |
462 |
|
|
463 |
out_uint32(s, 0); |
out_uint32(s, 0); |
464 |
out_uint8(s, server_bpp); |
out_uint8(s, g_server_bpp); |
465 |
out_uint16_le(s, 0x0700); |
out_uint16_le(s, 0x0700); |
466 |
out_uint8(s, 0); |
out_uint8(s, 0); |
467 |
out_uint32_le(s, 1); |
out_uint32_le(s, 1); |
469 |
|
|
470 |
out_uint16_le(s, SEC_TAG_CLI_4); |
out_uint16_le(s, SEC_TAG_CLI_4); |
471 |
out_uint16_le(s, 12); |
out_uint16_le(s, 12); |
472 |
out_uint32_le(s, 9); |
out_uint32_le(s, g_console_session ? 0xb : 9); |
473 |
out_uint32(s, 0); |
out_uint32(s, 0); |
474 |
|
|
475 |
/* Client encryption settings */ |
/* Client encryption settings */ |
476 |
out_uint16_le(s, SEC_TAG_CLI_CRYPT); |
out_uint16_le(s, SEC_TAG_CLI_CRYPT); |
477 |
out_uint16_le(s, 12); /* length */ |
out_uint16_le(s, 12); /* length */ |
478 |
out_uint32_le(s, encryption ? 0x3 : 0); /* encryption supported, 128-bit supported */ |
out_uint32_le(s, g_encryption ? 0x3 : 0); /* encryption supported, 128-bit supported */ |
479 |
out_uint32(s, 0); /* Unknown */ |
out_uint32(s, 0); /* Unknown */ |
480 |
|
|
481 |
DEBUG_RDP5(("g_num_channels is %d\n", g_num_channels)); |
DEBUG_RDP5(("g_num_channels is %d\n", g_num_channels)); |
619 |
} |
} |
620 |
else |
else |
621 |
{ |
{ |
622 |
|
uint32 certcount; |
623 |
|
|
624 |
DEBUG_RDP5(("We're going for the RDP5-style encryption\n")); |
DEBUG_RDP5(("We're going for the RDP5-style encryption\n")); |
625 |
in_uint8s(s, 4); /* Number of certificates */ |
in_uint32_le(s, certcount); /* Number of certificates */ |
626 |
|
|
627 |
|
if (certcount < 2) |
628 |
|
{ |
629 |
|
error("Server didn't send enough X509 certificates\n"); |
630 |
|
return False; |
631 |
|
} |
632 |
|
|
633 |
|
for (; certcount > 2; certcount--) |
634 |
|
{ /* ignore all the certificates between the root and the signing CA */ |
635 |
|
uint32 ignorelen; |
636 |
|
X509 *ignorecert; |
637 |
|
|
638 |
|
DEBUG_RDP5(("Ignored certs left: %d\n", certcount)); |
639 |
|
|
640 |
|
in_uint32_le(s, ignorelen); |
641 |
|
DEBUG_RDP5(("Ignored Certificate length is %d\n", ignorelen)); |
642 |
|
ignorecert = d2i_X509(NULL, &(s->p), ignorelen); |
643 |
|
|
644 |
|
if (ignorecert == NULL) |
645 |
|
{ /* XXX: error out? */ |
646 |
|
DEBUG_RDP5(("got a bad cert: this will probably screw up the rest of the communication\n")); |
647 |
|
} |
648 |
|
|
649 |
|
#ifdef WITH_DEBUG_RDP5 |
650 |
|
DEBUG_RDP5(("cert #%d (ignored):\n", certcount)); |
651 |
|
X509_print_fp(stdout, ignorecert); |
652 |
|
#endif |
653 |
|
} |
654 |
|
|
655 |
/* Do da funky X.509 stuffy |
/* Do da funky X.509 stuffy |
656 |
|
|
724 |
|
|
725 |
DEBUG(("Generating client random\n")); |
DEBUG(("Generating client random\n")); |
726 |
/* Generate a client random, and hence determine encryption keys */ |
/* Generate a client random, and hence determine encryption keys */ |
727 |
// This is what the MS client do: |
/* This is what the MS client do: */ |
728 |
memset(inr, 0, SEC_RANDOM_SIZE); |
memset(inr, 0, SEC_RANDOM_SIZE); |
729 |
/* *ARIGL!* Plaintext attack, anyone? |
/* *ARIGL!* Plaintext attack, anyone? |
730 |
I tried doing: |
I tried doing: |
761 |
static void |
static void |
762 |
sec_process_srv_info(STREAM s) |
sec_process_srv_info(STREAM s) |
763 |
{ |
{ |
764 |
in_uint16_le(s, server_rdp_version); |
in_uint16_le(s, g_server_rdp_version); |
765 |
DEBUG_RDP5(("Server RDP version is %d\n", server_rdp_version)); |
DEBUG_RDP5(("Server RDP version is %d\n", g_server_rdp_version)); |
766 |
if (1 == server_rdp_version) |
if (1 == g_server_rdp_version) |
767 |
use_rdp5 = 0; |
{ |
768 |
|
g_use_rdp5 = 0; |
769 |
|
g_server_bpp = 8; |
770 |
|
} |
771 |
} |
} |
772 |
|
|
773 |
|
|
779 |
uint8 *next_tag; |
uint8 *next_tag; |
780 |
uint8 len; |
uint8 len; |
781 |
|
|
782 |
in_uint8s(s, 21); /* header (T.124 stuff, probably) */ |
in_uint8s(s, 21); /* header (T.124 ConferenceCreateResponse) */ |
783 |
in_uint8(s, len); |
in_uint8(s, len); |
784 |
if (len & 0x80) |
if (len & 0x80) |
785 |
in_uint8(s, len); |
in_uint8(s, len); |
807 |
case SEC_TAG_SRV_CHANNELS: |
case SEC_TAG_SRV_CHANNELS: |
808 |
/* FIXME: We should parse this information and |
/* FIXME: We should parse this information and |
809 |
use it to map RDP5 channels to MCS |
use it to map RDP5 channels to MCS |
810 |
channels */ |
channels */ |
811 |
break; |
break; |
812 |
|
|
813 |
default: |
default: |
828 |
|
|
829 |
while ((s = mcs_recv(&channel)) != NULL) |
while ((s = mcs_recv(&channel)) != NULL) |
830 |
{ |
{ |
831 |
if (encryption || !g_licence_issued) |
if (g_encryption || !g_licence_issued) |
832 |
{ |
{ |
833 |
in_uint32_le(s, sec_flags); |
in_uint32_le(s, sec_flags); |
834 |
|
|
871 |
if (!mcs_connect(server, &mcs_data, username)) |
if (!mcs_connect(server, &mcs_data, username)) |
872 |
return False; |
return False; |
873 |
|
|
874 |
// sec_process_mcs_data(&mcs_data); |
/* sec_process_mcs_data(&mcs_data); */ |
875 |
if (encryption) |
if (g_encryption) |
876 |
sec_establish_key(); |
sec_establish_key(); |
877 |
xfree(mcs_data.data); |
xfree(mcs_data.data); |
878 |
return True; |
return True; |