37 |
extern int width; |
extern int width; |
38 |
extern int height; |
extern int height; |
39 |
extern int keylayout; |
extern int keylayout; |
40 |
extern BOOL encryption; |
extern BOOL g_encryption; |
41 |
extern BOOL licence_issued; |
extern BOOL g_licence_issued; |
42 |
extern BOOL use_rdp5; |
extern BOOL g_use_rdp5; |
43 |
extern int server_bpp; |
extern int g_server_bpp; |
44 |
|
extern uint16 mcs_userid; |
45 |
|
extern VCHANNEL g_channels[]; |
46 |
|
extern unsigned int g_num_channels; |
47 |
|
|
48 |
static int rc4_key_len; |
static int rc4_key_len; |
49 |
static RC4_KEY rc4_decrypt_key; |
static RC4_KEY rc4_decrypt_key; |
57 |
static uint8 sec_encrypt_update_key[16]; |
static uint8 sec_encrypt_update_key[16]; |
58 |
static uint8 sec_crypted_random[SEC_MODULUS_SIZE]; |
static uint8 sec_crypted_random[SEC_MODULUS_SIZE]; |
59 |
|
|
60 |
uint16 server_rdp_version = 0; |
uint16 g_server_rdp_version = 0; |
61 |
|
|
62 |
/* |
/* |
63 |
* General purpose 48-byte transformation, using two 32-byte salts (generally, |
* General purpose 48-byte transformation, using two 32-byte salts (generally, |
333 |
int hdrlen; |
int hdrlen; |
334 |
STREAM s; |
STREAM s; |
335 |
|
|
336 |
if (!licence_issued) |
if (!g_licence_issued) |
337 |
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 4; |
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 4; |
338 |
else |
else |
339 |
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 0; |
hdrlen = (flags & SEC_ENCRYPT) ? 12 : 0; |
343 |
return s; |
return s; |
344 |
} |
} |
345 |
|
|
346 |
/* Transmit secure transport packet */ |
/* Transmit secure transport packet over specified channel */ |
347 |
void |
void |
348 |
sec_send(STREAM s, uint32 flags) |
sec_send_to_channel(STREAM s, uint32 flags, uint16 channel) |
349 |
{ |
{ |
350 |
int datalen; |
int datalen; |
351 |
|
|
352 |
s_pop_layer(s, sec_hdr); |
s_pop_layer(s, sec_hdr); |
353 |
if (!licence_issued || (flags & SEC_ENCRYPT)) |
if (!g_licence_issued || (flags & SEC_ENCRYPT)) |
354 |
out_uint32_le(s, flags); |
out_uint32_le(s, flags); |
355 |
|
|
356 |
if (flags & SEC_ENCRYPT) |
if (flags & SEC_ENCRYPT) |
367 |
sec_encrypt(s->p + 8, datalen); |
sec_encrypt(s->p + 8, datalen); |
368 |
} |
} |
369 |
|
|
370 |
mcs_send(s); |
mcs_send_to_channel(s, channel); |
371 |
|
} |
372 |
|
|
373 |
|
/* Transmit secure transport packet */ |
374 |
|
|
375 |
|
void |
376 |
|
sec_send(STREAM s, uint32 flags) |
377 |
|
{ |
378 |
|
sec_send_to_channel(s, flags, MCS_GLOBAL_CHANNEL); |
379 |
} |
} |
380 |
|
|
381 |
|
|
382 |
/* Transfer the client random to the server */ |
/* Transfer the client random to the server */ |
383 |
static void |
static void |
384 |
sec_establish_key(void) |
sec_establish_key(void) |
402 |
sec_out_mcs_data(STREAM s) |
sec_out_mcs_data(STREAM s) |
403 |
{ |
{ |
404 |
int hostlen = 2 * strlen(hostname); |
int hostlen = 2 * strlen(hostname); |
405 |
int length = 158 + 76 + 12 + 4 + 20; |
int length = 158 + 76 + 12 + 4; |
406 |
|
unsigned int i; |
407 |
|
|
408 |
|
if (g_num_channels > 0) |
409 |
|
length += g_num_channels * 12 + 8; |
410 |
|
|
411 |
if (hostlen > 30) |
if (hostlen > 30) |
412 |
hostlen = 30; |
hostlen = 30; |
430 |
/* Client information */ |
/* Client information */ |
431 |
out_uint16_le(s, SEC_TAG_CLI_INFO); |
out_uint16_le(s, SEC_TAG_CLI_INFO); |
432 |
out_uint16_le(s, 212); /* length */ |
out_uint16_le(s, 212); /* length */ |
433 |
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. */ |
434 |
out_uint16_le(s, 8); |
out_uint16_le(s, 8); |
435 |
out_uint16_le(s, width); |
out_uint16_le(s, width); |
436 |
out_uint16_le(s, height); |
out_uint16_le(s, height); |
448 |
out_uint32_le(s, 12); |
out_uint32_le(s, 12); |
449 |
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */ |
out_uint8s(s, 64); /* reserved? 4 + 12 doublewords */ |
450 |
|
|
451 |
switch (server_bpp) |
switch (g_server_bpp) |
452 |
{ |
{ |
453 |
case 8: |
case 8: |
454 |
out_uint16_le(s, 0xca01); |
out_uint16_le(s, 0xca01); |
466 |
out_uint16_le(s, 1); |
out_uint16_le(s, 1); |
467 |
|
|
468 |
out_uint32(s, 0); |
out_uint32(s, 0); |
469 |
out_uint8(s, server_bpp); |
out_uint8(s, g_server_bpp); |
470 |
out_uint16_le(s, 0x0700); |
out_uint16_le(s, 0x0700); |
471 |
out_uint8(s, 0); |
out_uint8(s, 0); |
472 |
out_uint32_le(s, 1); |
out_uint32_le(s, 1); |
480 |
/* Client encryption settings */ |
/* Client encryption settings */ |
481 |
out_uint16_le(s, SEC_TAG_CLI_CRYPT); |
out_uint16_le(s, SEC_TAG_CLI_CRYPT); |
482 |
out_uint16_le(s, 12); /* length */ |
out_uint16_le(s, 12); /* length */ |
483 |
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 */ |
484 |
out_uint32(s, 0); /* Unknown */ |
out_uint32(s, 0); /* Unknown */ |
485 |
|
|
486 |
out_uint16_le(s, SEC_TAG_CLI_CHANNELS); |
DEBUG_RDP5(("g_num_channels is %d\n", g_num_channels)); |
487 |
out_uint16_le(s, 20); /* length */ |
if (g_num_channels > 0) |
488 |
out_uint32_le(s, 1); /* number of virtual channels */ |
{ |
489 |
out_uint8p(s, "cliprdr", 8); /* name padded to 8(?) */ |
out_uint16_le(s, SEC_TAG_CLI_CHANNELS); |
490 |
out_uint16(s, 0); |
out_uint16_le(s, g_num_channels * 12 + 8); /* length */ |
491 |
out_uint16_le(s, 0xc0a0); /* Flags. Rumours tell this is documented in MSDN. */ |
out_uint32_le(s, g_num_channels); /* number of virtual channels */ |
492 |
|
for (i = 0; i < g_num_channels; i++) |
493 |
|
{ |
494 |
|
DEBUG_RDP5(("Requesting channel %s\n", g_channels[i].name)); |
495 |
|
out_uint8a(s, g_channels[i].name, 8); |
496 |
|
out_uint32_be(s, g_channels[i].flags); |
497 |
|
} |
498 |
|
} |
499 |
|
|
500 |
s_mark_end(s); |
s_mark_end(s); |
501 |
} |
} |
586 |
if (end > s->end) |
if (end > s->end) |
587 |
return False; |
return False; |
588 |
|
|
589 |
in_uint32_le(s, flags); /* 1 = RDP4-style, 0x80000002 = X.509 */ |
in_uint32_le(s, flags); /* 1 = RDP4-style, 0x80000002 = X.509 */ |
590 |
if (flags & 1) |
if (flags & 1) |
591 |
{ |
{ |
592 |
DEBUG_RDP5(("We're going for the RDP4-style encryption\n")); |
DEBUG_RDP5(("We're going for the RDP4-style encryption\n")); |
637 |
*/ |
*/ |
638 |
|
|
639 |
in_uint32_le(s, cacert_len); |
in_uint32_le(s, cacert_len); |
640 |
|
DEBUG_RDP5(("CA Certificate length is %d\n", cacert_len)); |
641 |
cacert = d2i_X509(NULL, &(s->p), cacert_len); |
cacert = d2i_X509(NULL, &(s->p), cacert_len); |
642 |
/* Note: We don't need to move s->p here - d2i_X509 is |
/* Note: We don't need to move s->p here - d2i_X509 is |
643 |
"kind" enough to do it for us */ |
"kind" enough to do it for us */ |
658 |
*/ |
*/ |
659 |
|
|
660 |
in_uint32_le(s, cert_len); |
in_uint32_le(s, cert_len); |
661 |
|
DEBUG_RDP5(("Certificate length is %d\n", cert_len)); |
662 |
server_cert = d2i_X509(NULL, &(s->p), cert_len); |
server_cert = d2i_X509(NULL, &(s->p), cert_len); |
663 |
if (NULL == server_cert) |
if (NULL == server_cert) |
664 |
{ |
{ |
699 |
|
|
700 |
DEBUG(("Generating client random\n")); |
DEBUG(("Generating client random\n")); |
701 |
/* Generate a client random, and hence determine encryption keys */ |
/* Generate a client random, and hence determine encryption keys */ |
|
generate_random(inr); |
|
702 |
// This is what the MS client do: |
// This is what the MS client do: |
703 |
// memset(inr, 0, SEC_RANDOM_SIZE); |
memset(inr, 0, SEC_RANDOM_SIZE); |
704 |
// *ARIGL!* |
/* *ARIGL!* Plaintext attack, anyone? |
705 |
|
I tried doing: |
706 |
|
generate_random(inr); |
707 |
|
..but that generates connection errors now and then (yes, |
708 |
|
"now and then". Something like 0 to 3 attempts needed before a |
709 |
|
successful connection. Nice. Not! |
710 |
|
*/ |
711 |
|
|
712 |
generate_random(client_random); |
generate_random(client_random); |
713 |
if (NULL != server_public_key) |
if (NULL != server_public_key) |
714 |
{ /* Which means we should use |
{ /* Which means we should use |
736 |
static void |
static void |
737 |
sec_process_srv_info(STREAM s) |
sec_process_srv_info(STREAM s) |
738 |
{ |
{ |
739 |
in_uint16_le(s, server_rdp_version); |
in_uint16_le(s, g_server_rdp_version); |
740 |
DEBUG_RDP5(("Server RDP version is %d\n", server_rdp_version)); |
DEBUG_RDP5(("Server RDP version is %d\n", g_server_rdp_version)); |
741 |
|
if (1 == g_server_rdp_version) |
742 |
|
g_use_rdp5 = 0; |
743 |
} |
} |
744 |
|
|
745 |
|
|
772 |
sec_process_srv_info(s); |
sec_process_srv_info(s); |
773 |
break; |
break; |
774 |
|
|
|
case SEC_TAG_SRV_3: |
|
|
break; |
|
|
|
|
775 |
case SEC_TAG_SRV_CRYPT: |
case SEC_TAG_SRV_CRYPT: |
776 |
sec_process_crypt_info(s); |
sec_process_crypt_info(s); |
777 |
break; |
break; |
778 |
|
|
779 |
|
case SEC_TAG_SRV_CHANNELS: |
780 |
|
/* FIXME: We should parse this information and |
781 |
|
use it to map RDP5 channels to MCS |
782 |
|
channels */ |
783 |
|
break; |
784 |
|
|
785 |
default: |
default: |
786 |
unimpl("response tag 0x%x\n", tag); |
unimpl("response tag 0x%x\n", tag); |
787 |
} |
} |
800 |
|
|
801 |
while ((s = mcs_recv(&channel)) != NULL) |
while ((s = mcs_recv(&channel)) != NULL) |
802 |
{ |
{ |
803 |
if (encryption || !licence_issued) |
if (g_encryption || !g_licence_issued) |
804 |
{ |
{ |
805 |
in_uint32_le(s, sec_flags); |
in_uint32_le(s, sec_flags); |
806 |
|
|
|
if (sec_flags & SEC_LICENCE_NEG) |
|
|
{ |
|
|
if (sec_flags & SEC_ENCRYPT) { |
|
|
DEBUG_RDP5(("Encrypted license detected\n")); |
|
|
} |
|
|
licence_process(s); |
|
|
continue; |
|
|
} |
|
|
|
|
807 |
if (sec_flags & SEC_ENCRYPT) |
if (sec_flags & SEC_ENCRYPT) |
808 |
{ |
{ |
809 |
in_uint8s(s, 8); /* signature */ |
in_uint8s(s, 8); /* signature */ |
810 |
sec_decrypt(s->p, s->end - s->p); |
sec_decrypt(s->p, s->end - s->p); |
811 |
} |
} |
812 |
|
|
813 |
|
if (sec_flags & SEC_LICENCE_NEG) |
814 |
|
{ |
815 |
|
licence_process(s); |
816 |
|
continue; |
817 |
|
} |
818 |
} |
} |
819 |
|
|
820 |
if (MCS_GLOBAL_CHANNEL == channel) |
if (channel != MCS_GLOBAL_CHANNEL) |
821 |
{ |
{ |
822 |
return s; |
channel_process(s, channel); |
823 |
|
continue; |
824 |
} |
} |
|
else |
|
|
rdp5_process_channel(s, channel); |
|
825 |
|
|
826 |
|
return s; |
827 |
} |
} |
828 |
|
|
829 |
return NULL; |
return NULL; |
837 |
|
|
838 |
/* We exchange some RDP data during the MCS-Connect */ |
/* We exchange some RDP data during the MCS-Connect */ |
839 |
mcs_data.size = 512; |
mcs_data.size = 512; |
840 |
mcs_data.p = mcs_data.data = xmalloc(mcs_data.size); |
mcs_data.p = mcs_data.data = (uint8 *) xmalloc(mcs_data.size); |
841 |
sec_out_mcs_data(&mcs_data); |
sec_out_mcs_data(&mcs_data); |
842 |
|
|
843 |
if (!mcs_connect(server, &mcs_data, username)) |
if (!mcs_connect(server, &mcs_data, username)) |
844 |
return False; |
return False; |
845 |
|
|
846 |
// sec_process_mcs_data(&mcs_data); |
// sec_process_mcs_data(&mcs_data); |
847 |
if (encryption) |
if (g_encryption) |
848 |
sec_establish_key(); |
sec_establish_key(); |
849 |
xfree(mcs_data.data); |
xfree(mcs_data.data); |
850 |
return True; |
return True; |