1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
|
/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
xrdp: A Remote Desktop Protocol server.
Copyright (C) Jay Sorg 2004-2007
secure layer
*/
#include "libxrdp.h"
/* some compilers need unsigned char to avoid warnings */
static tui8 g_pad_54[40] =
{ 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, 54, 54, 54 };
/* some compilers need unsigned char to avoid warnings */
static tui8 g_pad_92[48] =
{ 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, 92, 92, 92, 92, 92, 92, 92 };
/* some compilers need unsigned char to avoid warnings */
static tui8 g_lic1[322] =
{ 0x80, 0x00, 0x3e, 0x01, 0x01, 0x02, 0x3e, 0x01,
0x7b, 0x3c, 0x31, 0xa6, 0xae, 0xe8, 0x74, 0xf6,
0xb4, 0xa5, 0x03, 0x90, 0xe7, 0xc2, 0xc7, 0x39,
0xba, 0x53, 0x1c, 0x30, 0x54, 0x6e, 0x90, 0x05,
0xd0, 0x05, 0xce, 0x44, 0x18, 0x91, 0x83, 0x81,
0x00, 0x00, 0x04, 0x00, 0x2c, 0x00, 0x00, 0x00,
0x4d, 0x00, 0x69, 0x00, 0x63, 0x00, 0x72, 0x00,
0x6f, 0x00, 0x73, 0x00, 0x6f, 0x00, 0x66, 0x00,
0x74, 0x00, 0x20, 0x00, 0x43, 0x00, 0x6f, 0x00,
0x72, 0x00, 0x70, 0x00, 0x6f, 0x00, 0x72, 0x00,
0x61, 0x00, 0x74, 0x00, 0x69, 0x00, 0x6f, 0x00,
0x6e, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00,
0x32, 0x00, 0x33, 0x00, 0x36, 0x00, 0x00, 0x00,
0x0d, 0x00, 0x04, 0x00, 0x01, 0x00, 0x00, 0x00,
0x03, 0x00, 0xb8, 0x00, 0x01, 0x00, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x06, 0x00, 0x5c, 0x00, 0x52, 0x53, 0x41, 0x31,
0x48, 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00,
0x3f, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00,
0x01, 0xc7, 0xc9, 0xf7, 0x8e, 0x5a, 0x38, 0xe4,
0x29, 0xc3, 0x00, 0x95, 0x2d, 0xdd, 0x4c, 0x3e,
0x50, 0x45, 0x0b, 0x0d, 0x9e, 0x2a, 0x5d, 0x18,
0x63, 0x64, 0xc4, 0x2c, 0xf7, 0x8f, 0x29, 0xd5,
0x3f, 0xc5, 0x35, 0x22, 0x34, 0xff, 0xad, 0x3a,
0xe6, 0xe3, 0x95, 0x06, 0xae, 0x55, 0x82, 0xe3,
0xc8, 0xc7, 0xb4, 0xa8, 0x47, 0xc8, 0x50, 0x71,
0x74, 0x29, 0x53, 0x89, 0x6d, 0x9c, 0xed, 0x70,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x08, 0x00, 0x48, 0x00, 0xa8, 0xf4, 0x31, 0xb9,
0xab, 0x4b, 0xe6, 0xb4, 0xf4, 0x39, 0x89, 0xd6,
0xb1, 0xda, 0xf6, 0x1e, 0xec, 0xb1, 0xf0, 0x54,
0x3b, 0x5e, 0x3e, 0x6a, 0x71, 0xb4, 0xf7, 0x75,
0xc8, 0x16, 0x2f, 0x24, 0x00, 0xde, 0xe9, 0x82,
0x99, 0x5f, 0x33, 0x0b, 0xa9, 0xa6, 0x94, 0xaf,
0xcb, 0x11, 0xc3, 0xf2, 0xdb, 0x09, 0x42, 0x68,
0x29, 0x56, 0x58, 0x01, 0x56, 0xdb, 0x59, 0x03,
0x69, 0xdb, 0x7d, 0x37, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x0e, 0x00, 0x0e, 0x00, 0x6d, 0x69, 0x63, 0x72,
0x6f, 0x73, 0x6f, 0x66, 0x74, 0x2e, 0x63, 0x6f,
0x6d, 0x00 };
/* some compilers need unsigned char to avoid warnings */
static tui8 g_lic2[20] =
{ 0x80, 0x00, 0x10, 0x00, 0xff, 0x02, 0x10, 0x00,
0x07, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
0x28, 0x14, 0x00, 0x00 };
/* mce */
/* some compilers need unsigned char to avoid warnings */
static tui8 g_lic3[20] =
{ 0x80, 0x02, 0x10, 0x00, 0xff, 0x03, 0x10, 0x00,
0x07, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
0xf3, 0x99, 0x00, 0x00 };
/*****************************************************************************/
static void APP_CC
hex_str_to_bin(char* in, char* out, int out_len)
{
int in_index;
int in_len;
int out_index;
int val;
char hex[16];
in_len = g_strlen(in);
out_index = 0;
in_index = 0;
while (in_index <= (in_len - 4))
{
if ((in[in_index] == '0') && (in[in_index + 1] == 'x'))
{
hex[0] = in[in_index + 2];
hex[1] = in[in_index + 3];
hex[2] = 0;
if (out_index < out_len)
{
val = g_htoi(hex);
out[out_index] = val;
}
out_index++;
}
in_index++;
}
}
/*****************************************************************************/
struct xrdp_sec* APP_CC
xrdp_sec_create(struct xrdp_rdp* owner, int sck, int crypt_level,
int channel_code)
{
struct xrdp_sec* self;
struct list* items;
struct list* values;
int fd;
int index;
char* item;
char* value;
DEBUG((" in xrdp_sec_create"));
self = (struct xrdp_sec*)g_malloc(sizeof(struct xrdp_sec), 1);
self->rdp_layer = owner;
self->rc4_key_size = 1; /* 1 = 40 bit, 2 = 128 bit */
self->crypt_level = 1; /* 1, 2, 3 = low, medium, high */
switch (crypt_level)
{
case 1:
self->rc4_key_size = 1;
self->crypt_level = 1;
break;
case 2:
self->rc4_key_size = 1;
self->crypt_level = 2;
break;
case 3:
self->rc4_key_size = 2;
self->crypt_level = 3;
break;
}
self->channel_code = channel_code;
self->decrypt_rc4_info = ssl_rc4_info_create();
self->encrypt_rc4_info = ssl_rc4_info_create();
g_random(self->server_random, 32);
self->mcs_layer = xrdp_mcs_create(self, sck, &self->client_mcs_data,
&self->server_mcs_data);
fd = g_file_open(XRDP_KEY_FILE); /* rsakeys.ini */
if (fd > 0)
{
items = list_create();
items->auto_free = 1;
values = list_create();
values->auto_free = 1;
file_read_section(fd, "keys", items, values);
for (index = 0; index < items->count; index++)
{
item = (char*)list_get_item(items, index);
value = (char*)list_get_item(values, index);
if (g_strncasecmp(item, "pub_exp", 255) == 0)
{
hex_str_to_bin(value, self->pub_exp, 4);
}
else if (g_strncasecmp(item, "pub_mod", 255) == 0)
{
hex_str_to_bin(value, self->pub_mod, 64);
}
else if (g_strncasecmp(item, "pub_sig", 255) == 0)
{
hex_str_to_bin(value, self->pub_sig, 64);
}
else if (g_strncasecmp(item, "pri_exp", 255) == 0)
{
hex_str_to_bin(value, self->pri_exp, 64);
}
}
list_delete(items);
list_delete(values);
g_file_close(fd);
}
self->chan_layer = xrdp_channel_create(self, self->mcs_layer);
DEBUG((" out xrdp_sec_create"));
return self;
}
/*****************************************************************************/
void APP_CC
xrdp_sec_delete(struct xrdp_sec* self)
{
if (self == 0)
{
return;
}
xrdp_channel_delete(self->chan_layer);
xrdp_mcs_delete(self->mcs_layer);
ssl_rc4_info_delete(self->decrypt_rc4_info);
ssl_rc4_info_delete(self->encrypt_rc4_info);
g_free(self->client_mcs_data.data);
g_free(self->server_mcs_data.data);
g_free(self);
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_sec_init(struct xrdp_sec* self, struct stream* s)
{
if (xrdp_mcs_init(self->mcs_layer, s) != 0)
{
return 1;
}
if (self->crypt_level > 1)
{
s_push_layer(s, sec_hdr, 4 + 8);
}
else
{
s_push_layer(s, sec_hdr, 4);
}
return 0;
}
/*****************************************************************************/
/* Reduce key entropy from 64 to 40 bits */
static void APP_CC
xrdp_sec_make_40bit(char* key)
{
key[0] = 0xd1;
key[1] = 0x26;
key[2] = 0x9e;
}
/*****************************************************************************/
/* returns error */
/* update an encryption key */
static int APP_CC
xrdp_sec_update(char* key, char* update_key, int key_len)
{
char shasig[20];
void* sha1_info;
void* md5_info;
void* rc4_info;
sha1_info = ssl_sha1_info_create();
md5_info = ssl_md5_info_create();
rc4_info = ssl_rc4_info_create();
ssl_sha1_clear(sha1_info);
ssl_sha1_transform(sha1_info, update_key, key_len);
ssl_sha1_transform(sha1_info, (char*)g_pad_54, 40);
ssl_sha1_transform(sha1_info, key, key_len);
ssl_sha1_complete(sha1_info, shasig);
ssl_md5_clear(md5_info);
ssl_md5_transform(md5_info, update_key, key_len);
ssl_md5_transform(md5_info, (char*)g_pad_92, 48);
ssl_md5_transform(md5_info, shasig, 20);
ssl_md5_complete(md5_info, key);
ssl_rc4_set_key(rc4_info, key, key_len);
ssl_rc4_crypt(rc4_info, key, key_len);
if (key_len == 8)
{
xrdp_sec_make_40bit(key);
}
ssl_sha1_info_delete(sha1_info);
ssl_md5_info_delete(md5_info);
ssl_rc4_info_delete(rc4_info);
return 0;
}
/*****************************************************************************/
static void APP_CC
xrdp_sec_decrypt(struct xrdp_sec* self, char* data, int len)
{
if (self->decrypt_use_count == 4096)
{
xrdp_sec_update(self->decrypt_key, self->decrypt_update_key,
self->rc4_key_len);
ssl_rc4_set_key(self->decrypt_rc4_info, self->decrypt_key,
self->rc4_key_len);
self->decrypt_use_count = 0;
}
ssl_rc4_crypt(self->decrypt_rc4_info, data, len);
self->decrypt_use_count++;
}
/*****************************************************************************/
static void APP_CC
xrdp_sec_encrypt(struct xrdp_sec* self, char* data, int len)
{
if (self->encrypt_use_count == 4096)
{
xrdp_sec_update(self->encrypt_key, self->encrypt_update_key,
self->rc4_key_len);
ssl_rc4_set_key(self->encrypt_rc4_info, self->encrypt_key,
self->rc4_key_len);
self->encrypt_use_count = 0;
}
ssl_rc4_crypt(self->encrypt_rc4_info, data, len);
self->encrypt_use_count++;
}
/*****************************************************************************/
static int APP_CC
unicode_in(struct stream* s, int uni_len, char* dst, int dst_len)
{
int dst_index;
int src_index;
dst_index = 0;
src_index = 0;
while (src_index < uni_len)
{
if (dst_index >= dst_len || src_index > 512)
{
break;
}
in_uint8(s, dst[dst_index]);
in_uint8s(s, 1);
dst_index++;
src_index += 2;
}
in_uint8s(s, 2);
return 0;
}
/*****************************************************************************/
/* returns error */
static int APP_CC
xrdp_sec_process_logon_info(struct xrdp_sec* self, struct stream* s)
{
int flags;
int len_domain;
int len_user;
int len_password;
int len_program;
int len_directory;
int len_ip;
int len_dll;
int tzone;
char tmpdata[256];
in_uint8s(s, 4);
in_uint32_le(s, flags);
DEBUG(("in xrdp_sec_process_logon_info flags $%x", flags));
/* this is the first test that the decrypt is working */
if ((flags & RDP_LOGON_NORMAL) != RDP_LOGON_NORMAL) /* 0x33 */
{ /* must be or error */
return 1;
}
if (flags & 0x400)
{
self->rdp_layer->client_info.is_mce = 1;
DEBUG(("flag 0x400 found"));
}
if (flags & RDP_LOGON_LEAVE_AUDIO)
{
self->rdp_layer->client_info.sound_code = 1;
DEBUG(("flag RDP_LOGON_LEAVE_AUDIO found"));
}
if ((flags & RDP_LOGON_AUTO) && (!self->rdp_layer->client_info.is_mce))
/* todo, for now not allowing autologon and mce both */
{
self->rdp_layer->client_info.rdp_autologin = 1;
DEBUG(("flag RDP_LOGON_AUTO found"));
}
if (flags & RDP_COMPRESSION)
{
self->rdp_layer->client_info.rdp_compression = 1;
DEBUG(("flag RDP_COMPRESSION found"));
}
in_uint16_le(s, len_domain);
in_uint16_le(s, len_user);
in_uint16_le(s, len_password);
in_uint16_le(s, len_program);
in_uint16_le(s, len_directory);
/* todo, we should error out in any of the above lengths are > 512 */
/* to avoid buffer overruns */
unicode_in(s, len_domain, self->rdp_layer->client_info.domain, 255);
DEBUG(("domain %s", self->rdp_layer->client_info.domain));
unicode_in(s, len_user, self->rdp_layer->client_info.username, 255);
DEBUG(("username %s", self->rdp_layer->client_info.username));
if (flags & RDP_LOGON_AUTO)
{
unicode_in(s, len_password, self->rdp_layer->client_info.password, 255);
DEBUG(("flag RDP_LOGON_AUTO found"));
}
else
{
in_uint8s(s, len_password + 2);
}
unicode_in(s, len_program, self->rdp_layer->client_info.program, 255);
DEBUG(("program %s", self->rdp_layer->client_info.program));
unicode_in(s, len_directory, self->rdp_layer->client_info.directory, 255);
DEBUG(("directory %s", self->rdp_layer->client_info.directory));
if (flags & RDP_LOGON_BLOB)
{
in_uint8s(s, 2); /* unknown */
in_uint16_le(s, len_ip);
unicode_in(s, len_ip - 2, tmpdata, 255);
in_uint16_le(s, len_dll);
unicode_in(s, len_dll - 2, tmpdata, 255);
in_uint32_le(s, tzone); /* len of timetone */
in_uint8s(s, 62); /* skip */
in_uint8s(s, 22); /* skip misc. */
in_uint8s(s, 62); /* skip */
in_uint8s(s, 26); /* skip stuff */
in_uint32_le(s, self->rdp_layer->client_info.rdp5_performanceflags);
}
DEBUG(("out xrdp_sec_process_logon_info"));
return 0;
}
/*****************************************************************************/
/* returns error */
static int APP_CC
xrdp_sec_send_lic_initial(struct xrdp_sec* self)
{
struct stream* s;
make_stream(s);
init_stream(s, 8192);
if (xrdp_mcs_init(self->mcs_layer, s) != 0)
{
free_stream(s);
return 1;
}
out_uint8a(s, g_lic1, 322);
s_mark_end(s);
if (xrdp_mcs_send(self->mcs_layer, s, MCS_GLOBAL_CHANNEL) != 0)
{
free_stream(s);
return 1;
}
free_stream(s);
return 0;
}
/*****************************************************************************/
/* returns error */
static int APP_CC
xrdp_sec_send_lic_response(struct xrdp_sec* self)
{
struct stream* s;
make_stream(s);
init_stream(s, 8192);
if (xrdp_mcs_init(self->mcs_layer, s) != 0)
{
free_stream(s);
return 1;
}
out_uint8a(s, g_lic2, 20);
s_mark_end(s);
if (xrdp_mcs_send(self->mcs_layer, s, MCS_GLOBAL_CHANNEL) != 0)
{
free_stream(s);
return 1;
}
free_stream(s);
return 0;
}
/*****************************************************************************/
/* returns error */
static int APP_CC
xrdp_sec_send_media_lic_response(struct xrdp_sec* self)
{
struct stream* s;
make_stream(s);
init_stream(s, 8192);
if (xrdp_mcs_init(self->mcs_layer, s) != 0)
{
free_stream(s);
return 1;
}
out_uint8a(s, g_lic3, sizeof(g_lic3));
s_mark_end(s);
if (xrdp_mcs_send(self->mcs_layer, s, MCS_GLOBAL_CHANNEL) != 0)
{
free_stream(s);
return 1;
}
free_stream(s);
return 0;
}
/*****************************************************************************/
static void APP_CC
xrdp_sec_rsa_op(char* out, char* in, char* mod, char* exp)
{
ssl_mod_exp(out, 64, in, 64, mod, 64, exp, 64);
}
/*****************************************************************************/
static void APP_CC
xrdp_sec_hash_48(char* out, char* in, char* salt1, char* salt2, int salt)
{
int i;
void* sha1_info;
void* md5_info;
char pad[4];
char sha1_sig[20];
char md5_sig[16];
sha1_info = ssl_sha1_info_create();
md5_info = ssl_md5_info_create();
for (i = 0; i < 3; i++)
{
g_memset(pad, salt + i, 4);
ssl_sha1_clear(sha1_info);
ssl_sha1_transform(sha1_info, pad, i + 1);
ssl_sha1_transform(sha1_info, in, 48);
ssl_sha1_transform(sha1_info, salt1, 32);
ssl_sha1_transform(sha1_info, salt2, 32);
ssl_sha1_complete(sha1_info, sha1_sig);
ssl_md5_clear(md5_info);
ssl_md5_transform(md5_info, in, 48);
ssl_md5_transform(md5_info, sha1_sig, 20);
ssl_md5_complete(md5_info, md5_sig);
g_memcpy(out + i * 16, md5_sig, 16);
}
ssl_sha1_info_delete(sha1_info);
ssl_md5_info_delete(md5_info);
}
/*****************************************************************************/
static void APP_CC
xrdp_sec_hash_16(char* out, char* in, char* salt1, char* salt2)
{
void* md5_info;
md5_info = ssl_md5_info_create();
ssl_md5_clear(md5_info);
ssl_md5_transform(md5_info, in, 16);
ssl_md5_transform(md5_info, salt1, 32);
ssl_md5_transform(md5_info, salt2, 32);
ssl_md5_complete(md5_info, out);
ssl_md5_info_delete(md5_info);
}
/*****************************************************************************/
static void APP_CC
xrdp_sec_establish_keys(struct xrdp_sec* self)
{
char session_key[48];
char temp_hash[48];
char input[48];
g_memcpy(input, self->client_random, 24);
g_memcpy(input + 24, self->server_random, 24);
xrdp_sec_hash_48(temp_hash, input, self->client_random,
self->server_random, 65);
xrdp_sec_hash_48(session_key, temp_hash, self->client_random,
self->server_random, 88);
g_memcpy(self->sign_key, session_key, 16);
xrdp_sec_hash_16(self->encrypt_key, session_key + 16, self->client_random,
self->server_random);
xrdp_sec_hash_16(self->decrypt_key, session_key + 32, self->client_random,
self->server_random);
if (self->rc4_key_size == 1)
{
xrdp_sec_make_40bit(self->sign_key);
xrdp_sec_make_40bit(self->encrypt_key);
xrdp_sec_make_40bit(self->decrypt_key);
self->rc4_key_len = 8;
}
else
{
self->rc4_key_len = 16;
}
g_memcpy(self->decrypt_update_key, self->decrypt_key, 16);
g_memcpy(self->encrypt_update_key, self->encrypt_key, 16);
ssl_rc4_set_key(self->decrypt_rc4_info, self->decrypt_key, self->rc4_key_len);
ssl_rc4_set_key(self->encrypt_rc4_info, self->encrypt_key, self->rc4_key_len);
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_sec_recv(struct xrdp_sec* self, struct stream* s, int* chan)
{
int flags;
int len;
DEBUG((" in xrdp_sec_recv"));
if (xrdp_mcs_recv(self->mcs_layer, s, chan) != 0)
{
DEBUG((" out xrdp_sec_recv error"));
return 1;
}
in_uint32_le(s, flags);
DEBUG((" in xrdp_sec_recv flags $%x", flags));
if (flags & SEC_ENCRYPT) /* 0x08 */
{
in_uint8s(s, 8); /* signature */
xrdp_sec_decrypt(self, s->p, (int)(s->end - s->p));
}
if (flags & SEC_CLIENT_RANDOM) /* 0x01 */
{
in_uint32_le(s, len);
in_uint8a(s, self->client_crypt_random, 64);
xrdp_sec_rsa_op(self->client_random, self->client_crypt_random,
self->pub_mod, self->pri_exp);
xrdp_sec_establish_keys(self);
*chan = 1; /* just set a non existing channel and exit */
DEBUG((" out xrdp_sec_recv"));
return 0;
}
if (flags & SEC_LOGON_INFO) /* 0x40 */
{
if (xrdp_sec_process_logon_info(self, s) != 0)
{
DEBUG((" out xrdp_sec_recv error"));
return 1;
}
if (self->rdp_layer->client_info.is_mce)
{
if (xrdp_sec_send_media_lic_response(self) != 0)
{
DEBUG((" out xrdp_sec_recv error"));
return 1;
}
DEBUG((" out xrdp_sec_recv"));
return -1; /* special error that means send demand active */
}
if (xrdp_sec_send_lic_initial(self) != 0)
{
DEBUG((" out xrdp_sec_recv error"));
return 1;
}
*chan = 1; /* just set a non existing channel and exit */
DEBUG((" out xrdp_sec_recv"));
return 0;
}
if (flags & SEC_LICENCE_NEG) /* 0x80 */
{
if (xrdp_sec_send_lic_response(self) != 0)
{
DEBUG((" out xrdp_sec_recv error"));
return 1;
}
DEBUG((" out xrdp_sec_recv"));
return -1; /* special error that means send demand active */
}
DEBUG((" out xrdp_sec_recv"));
return 0;
}
/*****************************************************************************/
/* Output a uint32 into a buffer (little-endian) */
static void
buf_out_uint32(char* buffer, int value)
{
buffer[0] = (value) & 0xff;
buffer[1] = (value >> 8) & 0xff;
buffer[2] = (value >> 16) & 0xff;
buffer[3] = (value >> 24) & 0xff;
}
/*****************************************************************************/
/* Generate a MAC hash (5.2.3.1), using a combination of SHA1 and MD5 */
static void APP_CC
xrdp_sec_sign(struct xrdp_sec* self, char* out, int out_len,
char* data, int data_len)
{
char shasig[20];
char md5sig[16];
char lenhdr[4];
void* sha1_info;
void* md5_info;
buf_out_uint32(lenhdr, data_len);
sha1_info = ssl_sha1_info_create();
md5_info = ssl_md5_info_create();
ssl_sha1_clear(sha1_info);
ssl_sha1_transform(sha1_info, self->sign_key, self->rc4_key_len);
ssl_sha1_transform(sha1_info, (char*)g_pad_54, 40);
ssl_sha1_transform(sha1_info, lenhdr, 4);
ssl_sha1_transform(sha1_info, data, data_len);
ssl_sha1_complete(sha1_info, shasig);
ssl_md5_clear(md5_info);
ssl_md5_transform(md5_info, self->sign_key, self->rc4_key_len);
ssl_md5_transform(md5_info, (char*)g_pad_92, 48);
ssl_md5_transform(md5_info, shasig, 20);
ssl_md5_complete(md5_info, md5sig);
g_memcpy(out, md5sig, out_len);
ssl_sha1_info_delete(sha1_info);
ssl_md5_info_delete(md5_info);
}
/*****************************************************************************/
/* returns error */
int APP_CC
xrdp_sec_send(struct xrdp_sec* self, struct stream* s, int chan)
{
int datalen;
DEBUG((" in xrdp_sec_send"));
s_pop_layer(s, sec_hdr);
if (self->crypt_level > 1)
{
out_uint32_le(s, SEC_ENCRYPT);
datalen = (int)((s->end - s->p) - 8);
xrdp_sec_sign(self, s->p, 8, s->p + 8, datalen);
xrdp_sec_encrypt(self, s->p + 8, datalen);
}
else
{
out_uint32_le(s, 0);
}
if (xrdp_mcs_send(self->mcs_layer, s, chan) != 0)
{
return 1;
}
DEBUG((" out xrdp_sec_send"));
return 0;
}
/*****************************************************************************/
/* this adds the mcs channels in the list of channels to be used when
creating the server mcs data */
static int APP_CC
xrdp_sec_process_mcs_data_channels(struct xrdp_sec* self, struct stream* s)
{
int num_channels;
int index;
struct mcs_channel_item* channel_item;
DEBUG(("processing channels, channel_code is %d", self->channel_code));
/* this is an option set in xrdp.ini */
if (self->channel_code != 1) /* are channels on? */
{
return 0;
}
in_uint32_le(s, num_channels);
for (index = 0; index < num_channels; index++)
{
channel_item = (struct mcs_channel_item*)
g_malloc(sizeof(struct mcs_channel_item), 1);
in_uint8a(s, channel_item->name, 8);
in_uint32_be(s, channel_item->flags);
channel_item->chanid = MCS_GLOBAL_CHANNEL + (index + 1);
list_add_item(self->mcs_layer->channel_list, (long)channel_item);
DEBUG(("got channel flags %8.8x name %s", channel_item->flags,
channel_item->name));
}
return 0;
}
/*****************************************************************************/
/* process client mcs data, we need some things in here to create the server
mcs data */
int APP_CC
xrdp_sec_process_mcs_data(struct xrdp_sec* self)
{
struct stream* s;
char* hold_p;
int tag;
int size;
s = &self->client_mcs_data;
/* set p to beginning */
s->p = s->data;
/* skip header */
in_uint8s(s, 23);
while (s_check_rem(s, 4))
{
hold_p = s->p;
in_uint16_le(s, tag);
in_uint16_le(s, size);
if (size < 4 || !s_check_rem(s, size - 4))
{
g_writeln("error in xrdp_sec_process_mcs_data tag %d size %d",
tag, size);
break;
}
switch (tag)
{
case SEC_TAG_CLI_INFO:
break;
case SEC_TAG_CLI_CRYPT:
break;
case SEC_TAG_CLI_CHANNELS:
xrdp_sec_process_mcs_data_channels(self, s);
break;
case SEC_TAG_CLI_4:
break;
default:
g_writeln("error unknown xrdp_sec_process_mcs_data tag %d size %d",
tag, size);
break;
}
s->p = hold_p + size;
}
/* set p to beginning */
s->p = s->data;
return 0;
}
/*****************************************************************************/
/* prepare server mcs data to send in mcs layer */
int APP_CC
xrdp_sec_out_mcs_data(struct xrdp_sec* self)
{
struct stream* s;
int num_channels_even;
int num_channels;
int index;
int channel;
num_channels = self->mcs_layer->channel_list->count;
num_channels_even = num_channels + (num_channels & 1);
s = &self->server_mcs_data;
init_stream(s, 512);
out_uint16_be(s, 5);
out_uint16_be(s, 0x14);
out_uint8(s, 0x7c);
out_uint16_be(s, 1);
out_uint8(s, 0x2a);
out_uint8(s, 0x14);
out_uint8(s, 0x76);
out_uint8(s, 0x0a);
out_uint8(s, 1);
out_uint8(s, 1);
out_uint8(s, 0);
out_uint16_le(s, 0xc001);
out_uint8(s, 0);
out_uint8(s, 0x4d); /* M */
out_uint8(s, 0x63); /* c */
out_uint8(s, 0x44); /* D */
out_uint8(s, 0x6e); /* n */
out_uint16_be(s, 0x80fc + (num_channels_even * 2));
out_uint16_le(s, SEC_TAG_SRV_INFO);
out_uint16_le(s, 8); /* len */
out_uint8(s, 4); /* 4 = rdp5 1 = rdp4 */
out_uint8(s, 0);
out_uint8(s, 8);
out_uint8(s, 0);
out_uint16_le(s, SEC_TAG_SRV_CHANNELS);
out_uint16_le(s, 8 + (num_channels_even * 2)); /* len */
out_uint16_le(s, MCS_GLOBAL_CHANNEL); /* 1003, 0x03eb main channel */
out_uint16_le(s, num_channels); /* number of other channels */
for (index = 0; index < num_channels_even; index++)
{
if (index < num_channels)
{
channel = MCS_GLOBAL_CHANNEL + (index + 1);
out_uint16_le(s, channel);
}
else
{
out_uint16_le(s, 0);
}
}
out_uint16_le(s, SEC_TAG_SRV_CRYPT);
out_uint16_le(s, 0x00ec); /* len is 236 */
out_uint32_le(s, self->rc4_key_size); /* key len 1 = 40 bit 2 = 128 bit */
out_uint32_le(s, self->crypt_level); /* crypt level 1 = low 2 = medium */
/* 3 = high */
out_uint32_le(s, 32); /* 32 bytes random len */
out_uint32_le(s, 0xb8); /* 184 bytes rsa info(certificate) len */
out_uint8a(s, self->server_random, 32);
/* here to end is certificate */
/* HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ */
/* TermService\Parameters\Certificate */
out_uint32_le(s, 1);
out_uint32_le(s, 1);
out_uint32_le(s, 1);
out_uint16_le(s, SEC_TAG_PUBKEY);
out_uint16_le(s, 0x005c); /* 92 bytes length of SEC_TAG_PUBKEY */
out_uint32_le(s, SEC_RSA_MAGIC);
out_uint32_le(s, 0x48); /* 72 bytes modulus len */
out_uint32_be(s, 0x00020000);
out_uint32_be(s, 0x3f000000);
out_uint8a(s, self->pub_exp, 4); /* pub exp */
out_uint8a(s, self->pub_mod, 64); /* pub mod */
out_uint8s(s, 8); /* pad */
out_uint16_le(s, SEC_TAG_KEYSIG);
out_uint16_le(s, 72); /* len */
out_uint8a(s, self->pub_sig, 64); /* pub sig */
out_uint8s(s, 8); /* pad */
/* end certificate */
s_mark_end(s);
return 0;
}
/*****************************************************************************/
/* process the mcs client data we received from the mcs layer */
static void APP_CC
xrdp_sec_in_mcs_data(struct xrdp_sec* self)
{
struct stream* s;
struct xrdp_client_info* client_info;
int index;
char c;
client_info = &self->rdp_layer->client_info;
s = &self->client_mcs_data;
/* get hostname, its unicode */
s->p = s->data;
in_uint8s(s, 47);
g_memset(client_info->hostname, 0, 32);
c = 1;
index = 0;
while (index < 16 && c != 0)
{
in_uint8(s, c);
in_uint8s(s, 1);
client_info->hostname[index] = c;
index++;
}
/* get build */
s->p = s->data;
in_uint8s(s, 43);
in_uint32_le(s, client_info->build);
/* get keylayout */
s->p = s->data;
in_uint8s(s, 39);
in_uint32_le(s, client_info->keylayout);
s->p = s->data;
}
/*****************************************************************************/
int APP_CC
xrdp_sec_incoming(struct xrdp_sec* self)
{
DEBUG((" in xrdp_sec_incoming"));
if (xrdp_mcs_incoming(self->mcs_layer) != 0)
{
return 1;
}
#ifdef XRDP_DEBUG
g_writeln("client mcs data received");
g_hexdump(self->client_mcs_data.data,
(int)(self->client_mcs_data.end - self->client_mcs_data.data));
g_writeln("server mcs data sent");
g_hexdump(self->server_mcs_data.data,
(int)(self->server_mcs_data.end - self->server_mcs_data.data));
#endif
DEBUG((" out xrdp_sec_incoming"));
xrdp_sec_in_mcs_data(self);
return 0;
}
/*****************************************************************************/
int APP_CC
xrdp_sec_disconnect(struct xrdp_sec* self)
{
int rv;
DEBUG((" in xrdp_sec_disconnect"));
rv = xrdp_mcs_disconnect(self->mcs_layer);
DEBUG((" out xrdp_sec_disconnect"));
return rv;
}
|