-
Notifications
You must be signed in to change notification settings - Fork 14.5k
/
peer.c
1606 lines (1350 loc) · 42 KB
/
peer.c
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
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/**
* FreeRDP: A Remote Desktop Protocol Implementation
* RDP Server Peer
*
* Copyright 2011 Vic Lee
* Copyright 2014 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
* Copyright 2023 Armin Novak <anovak@thincast.com>
* Copyright 2023 Thincast Technologies GmbH
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <freerdp/config.h>
#include "settings.h"
#include <winpr/assert.h>
#include <winpr/crt.h>
#include <winpr/winsock.h>
#include "info.h"
#include "display.h"
#include <freerdp/log.h>
#include <freerdp/streamdump.h>
#include <freerdp/redirection.h>
#include <freerdp/crypto/certificate.h>
#include "rdp.h"
#include "peer.h"
#include "multitransport.h"
#define TAG FREERDP_TAG("core.peer")
static state_run_t peer_recv_pdu(freerdp_peer* client, wStream* s);
static HANDLE freerdp_peer_virtual_channel_open(freerdp_peer* client, const char* name,
UINT32 flags)
{
UINT32 index = 0;
BOOL joined = FALSE;
rdpMcsChannel* mcsChannel = NULL;
rdpPeerChannel* peerChannel = NULL;
rdpMcs* mcs = NULL;
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
WINPR_ASSERT(client->context->rdp);
WINPR_ASSERT(name);
mcs = client->context->rdp->mcs;
WINPR_ASSERT(mcs);
if (flags & WTS_CHANNEL_OPTION_DYNAMIC)
return NULL; /* not yet supported */
const size_t length = strnlen(name, 9);
if (length > 8)
return NULL; /* SVC maximum name length is 8 */
for (; index < mcs->channelCount; index++)
{
mcsChannel = &(mcs->channels[index]);
if (!mcsChannel->joined)
continue;
if (_strnicmp(name, mcsChannel->Name, length) == 0)
{
joined = TRUE;
break;
}
}
if (!joined)
return NULL; /* channel is not joined */
peerChannel = (rdpPeerChannel*)mcsChannel->handle;
if (peerChannel)
{
/* channel is already open */
return (HANDLE)peerChannel;
}
peerChannel = server_channel_common_new(client, index, mcsChannel->ChannelId, 128, NULL, name);
if (peerChannel)
{
peerChannel->channelFlags = flags;
peerChannel->mcsChannel = mcsChannel;
mcsChannel->handle = (void*)peerChannel;
}
return (HANDLE)peerChannel;
}
static BOOL freerdp_peer_virtual_channel_close(freerdp_peer* client, HANDLE hChannel)
{
rdpMcsChannel* mcsChannel = NULL;
rdpPeerChannel* peerChannel = NULL;
WINPR_ASSERT(client);
if (!hChannel)
return FALSE;
peerChannel = (rdpPeerChannel*)hChannel;
mcsChannel = peerChannel->mcsChannel;
WINPR_ASSERT(mcsChannel);
mcsChannel->handle = NULL;
server_channel_common_free(peerChannel);
return TRUE;
}
static int freerdp_peer_virtual_channel_write(freerdp_peer* client, HANDLE hChannel,
const BYTE* buffer, UINT32 length)
{
wStream* s = NULL;
UINT32 flags = 0;
UINT32 chunkSize = 0;
UINT32 maxChunkSize = 0;
UINT32 totalLength = 0;
rdpPeerChannel* peerChannel = NULL;
rdpMcsChannel* mcsChannel = NULL;
rdpRdp* rdp = NULL;
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
rdp = client->context->rdp;
WINPR_ASSERT(rdp);
WINPR_ASSERT(rdp->settings);
if (!hChannel)
return -1;
peerChannel = (rdpPeerChannel*)hChannel;
mcsChannel = peerChannel->mcsChannel;
WINPR_ASSERT(peerChannel);
WINPR_ASSERT(mcsChannel);
if (peerChannel->channelFlags & WTS_CHANNEL_OPTION_DYNAMIC)
return -1; /* not yet supported */
maxChunkSize = rdp->settings->VCChunkSize;
totalLength = length;
flags = CHANNEL_FLAG_FIRST;
while (length > 0)
{
s = rdp_send_stream_init(rdp);
if (!s)
return -1;
if (length > maxChunkSize)
{
chunkSize = rdp->settings->VCChunkSize;
}
else
{
chunkSize = length;
flags |= CHANNEL_FLAG_LAST;
}
if (mcsChannel->options & CHANNEL_OPTION_SHOW_PROTOCOL)
flags |= CHANNEL_FLAG_SHOW_PROTOCOL;
Stream_Write_UINT32(s, totalLength);
Stream_Write_UINT32(s, flags);
if (!Stream_EnsureRemainingCapacity(s, chunkSize))
{
Stream_Release(s);
return -1;
}
Stream_Write(s, buffer, chunkSize);
if (!rdp_send(rdp, s, peerChannel->channelId))
return -1;
buffer += chunkSize;
length -= chunkSize;
flags = 0;
}
return 1;
}
static void* freerdp_peer_virtual_channel_get_data(freerdp_peer* client, HANDLE hChannel)
{
rdpPeerChannel* peerChannel = (rdpPeerChannel*)hChannel;
WINPR_ASSERT(client);
if (!hChannel)
return NULL;
return peerChannel->extra;
}
static int freerdp_peer_virtual_channel_set_data(freerdp_peer* client, HANDLE hChannel, void* data)
{
rdpPeerChannel* peerChannel = (rdpPeerChannel*)hChannel;
WINPR_ASSERT(client);
if (!hChannel)
return -1;
peerChannel->extra = data;
return 1;
}
static BOOL freerdp_peer_set_state(freerdp_peer* client, CONNECTION_STATE state)
{
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
return rdp_server_transition_to_state(client->context->rdp, state);
}
static BOOL freerdp_peer_initialize(freerdp_peer* client)
{
rdpRdp* rdp = NULL;
rdpSettings* settings = NULL;
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
rdp = client->context->rdp;
WINPR_ASSERT(rdp);
settings = rdp->settings;
WINPR_ASSERT(settings);
settings->ServerMode = TRUE;
settings->FrameAcknowledge = 0;
settings->LocalConnection = client->local;
const rdpCertificate* cert =
freerdp_settings_get_pointer(settings, FreeRDP_RdpServerCertificate);
if (!cert)
{
WLog_ERR(TAG, "Missing server certificate, can not continue.");
return FALSE;
}
if (freerdp_settings_get_bool(settings, FreeRDP_RdpSecurity))
{
if (!freerdp_certificate_is_rdp_security_compatible(cert))
{
if (!freerdp_settings_set_bool(settings, FreeRDP_RdpSecurity, FALSE))
return FALSE;
if (!freerdp_settings_set_bool(settings, FreeRDP_UseRdpSecurityLayer, FALSE))
return FALSE;
}
}
nego_set_RCG_supported(rdp->nego, settings->RemoteCredentialGuard);
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_INITIAL))
return FALSE;
return TRUE;
}
#if defined(WITH_FREERDP_DEPRECATED)
static BOOL freerdp_peer_get_fds(freerdp_peer* client, void** rfds, int* rcount)
{
rdpTransport* transport = NULL;
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
WINPR_ASSERT(client->context->rdp);
transport = client->context->rdp->transport;
WINPR_ASSERT(transport);
transport_get_fds(transport, rfds, rcount);
return TRUE;
}
#endif
static HANDLE freerdp_peer_get_event_handle(freerdp_peer* client)
{
HANDLE hEvent = NULL;
rdpTransport* transport = NULL;
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
WINPR_ASSERT(client->context->rdp);
transport = client->context->rdp->transport;
hEvent = transport_get_front_bio(transport);
return hEvent;
}
static DWORD freerdp_peer_get_event_handles(freerdp_peer* client, HANDLE* events, DWORD count)
{
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
WINPR_ASSERT(client->context->rdp);
return transport_get_event_handles(client->context->rdp->transport, events, count);
}
static BOOL freerdp_peer_check_fds(freerdp_peer* peer)
{
int status = 0;
rdpRdp* rdp = NULL;
WINPR_ASSERT(peer);
WINPR_ASSERT(peer->context);
rdp = peer->context->rdp;
status = rdp_check_fds(rdp);
if (status < 0)
return FALSE;
return TRUE;
}
static state_run_t peer_recv_data_pdu(freerdp_peer* client, wStream* s, UINT16 totalLength)
{
BYTE type = 0;
UINT16 length = 0;
UINT32 share_id = 0;
BYTE compressed_type = 0;
UINT16 compressed_len = 0;
rdpUpdate* update = NULL;
WINPR_ASSERT(s);
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
rdpRdp* rdp = client->context->rdp;
WINPR_ASSERT(rdp);
WINPR_ASSERT(rdp->mcs);
update = client->context->update;
WINPR_ASSERT(update);
if (!rdp_read_share_data_header(rdp, s, &length, &type, &share_id, &compressed_type,
&compressed_len))
return STATE_RUN_FAILED;
#ifdef WITH_DEBUG_RDP
WLog_Print(rdp->log, WLOG_DEBUG, "recv %s Data PDU (0x%02" PRIX8 "), length: %" PRIu16 "",
data_pdu_type_to_string(type), type, length);
#endif
switch (type)
{
case DATA_PDU_TYPE_SYNCHRONIZE:
if (!rdp_recv_client_synchronize_pdu(rdp, s))
return STATE_RUN_FAILED;
break;
case DATA_PDU_TYPE_CONTROL:
if (!rdp_server_accept_client_control_pdu(rdp, s))
return STATE_RUN_FAILED;
break;
case DATA_PDU_TYPE_INPUT:
if (!input_recv(rdp->input, s))
return STATE_RUN_FAILED;
break;
case DATA_PDU_TYPE_BITMAP_CACHE_PERSISTENT_LIST:
if (!rdp_server_accept_client_persistent_key_list_pdu(rdp, s))
return STATE_RUN_FAILED;
break;
case DATA_PDU_TYPE_FONT_LIST:
if (!rdp_server_accept_client_font_list_pdu(rdp, s))
return STATE_RUN_FAILED;
return STATE_RUN_CONTINUE; // State changed, trigger rerun
case DATA_PDU_TYPE_SHUTDOWN_REQUEST:
mcs_send_disconnect_provider_ultimatum(rdp->mcs);
WLog_WARN(TAG, "disconnect provider ultimatum sent to peer, closing connection");
return STATE_RUN_QUIT_SESSION;
case DATA_PDU_TYPE_FRAME_ACKNOWLEDGE:
if (!Stream_CheckAndLogRequiredLength(TAG, s, 4))
return STATE_RUN_FAILED;
Stream_Read_UINT32(s, client->ack_frame_id);
IFCALL(update->SurfaceFrameAcknowledge, update->context, client->ack_frame_id);
break;
case DATA_PDU_TYPE_REFRESH_RECT:
if (!update_read_refresh_rect(update, s))
return STATE_RUN_FAILED;
break;
case DATA_PDU_TYPE_SUPPRESS_OUTPUT:
if (!update_read_suppress_output(update, s))
return STATE_RUN_FAILED;
break;
default:
WLog_ERR(TAG, "Data PDU type %" PRIu8 "", type);
break;
}
return STATE_RUN_SUCCESS;
}
static state_run_t peer_recv_tpkt_pdu(freerdp_peer* client, wStream* s)
{
state_run_t rc = STATE_RUN_SUCCESS;
rdpRdp* rdp = NULL;
UINT16 length = 0;
UINT16 pduType = 0;
UINT16 pduSource = 0;
UINT16 channelId = 0;
UINT16 securityFlags = 0;
rdpSettings* settings = NULL;
WINPR_ASSERT(s);
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
rdp = client->context->rdp;
WINPR_ASSERT(rdp);
WINPR_ASSERT(rdp->mcs);
settings = client->context->settings;
WINPR_ASSERT(settings);
if (!rdp_read_header(rdp, s, &length, &channelId))
return STATE_RUN_FAILED;
rdp->inPackets++;
if (freerdp_shall_disconnect_context(rdp->context))
return STATE_RUN_SUCCESS;
if (rdp_get_state(rdp) <= CONNECTION_STATE_LICENSING)
{
if (!rdp_read_security_header(rdp, s, &securityFlags, &length))
return STATE_RUN_FAILED;
if (securityFlags & SEC_ENCRYPT)
{
if (!rdp_decrypt(rdp, s, &length, securityFlags))
return STATE_RUN_FAILED;
}
return rdp_recv_message_channel_pdu(rdp, s, securityFlags);
}
if (settings->UseRdpSecurityLayer)
{
if (!rdp_read_security_header(rdp, s, &securityFlags, &length))
return STATE_RUN_FAILED;
if (securityFlags & SEC_ENCRYPT)
{
if (!rdp_decrypt(rdp, s, &length, securityFlags))
return STATE_RUN_FAILED;
}
}
if (channelId == MCS_GLOBAL_CHANNEL_ID)
{
char buffer[256] = { 0 };
UINT16 pduLength = 0;
UINT16 remain = 0;
if (!rdp_read_share_control_header(rdp, s, &pduLength, &remain, &pduType, &pduSource))
return STATE_RUN_FAILED;
settings->PduSource = pduSource;
WLog_DBG(TAG, "Received %s", pdu_type_to_str(pduType, buffer, sizeof(buffer)));
switch (pduType)
{
case PDU_TYPE_DATA:
rc = peer_recv_data_pdu(client, s, pduLength);
break;
case PDU_TYPE_CONFIRM_ACTIVE:
if (!rdp_server_accept_confirm_active(rdp, s, pduLength))
return STATE_RUN_FAILED;
break;
case PDU_TYPE_FLOW_RESPONSE:
case PDU_TYPE_FLOW_STOP:
case PDU_TYPE_FLOW_TEST:
if (!Stream_SafeSeek(s, remain))
{
WLog_WARN(TAG, "Short PDU, need %" PRIuz " bytes, got %" PRIuz, remain,
Stream_GetRemainingLength(s));
return STATE_RUN_FAILED;
}
break;
default:
WLog_ERR(TAG, "Client sent unknown pduType %" PRIu16 "", pduType);
return STATE_RUN_FAILED;
}
}
else if ((rdp->mcs->messageChannelId > 0) && (channelId == rdp->mcs->messageChannelId))
{
if (!settings->UseRdpSecurityLayer)
{
if (!rdp_read_security_header(rdp, s, &securityFlags, NULL))
return STATE_RUN_FAILED;
}
return rdp_recv_message_channel_pdu(rdp, s, securityFlags);
}
else
{
if (!freerdp_channel_peer_process(client, s, channelId))
return STATE_RUN_FAILED;
}
if (!tpkt_ensure_stream_consumed(s, length))
return STATE_RUN_FAILED;
return rc;
}
static state_run_t peer_recv_handle_auto_detect(freerdp_peer* client, wStream* s)
{
state_run_t ret = STATE_RUN_FAILED;
rdpRdp* rdp = NULL;
WINPR_ASSERT(client);
WINPR_ASSERT(s);
WINPR_ASSERT(client->context);
rdp = client->context->rdp;
WINPR_ASSERT(rdp);
const rdpSettings* settings = client->context->settings;
WINPR_ASSERT(settings);
if (freerdp_settings_get_bool(settings, FreeRDP_NetworkAutoDetect))
{
switch (rdp_get_state(rdp))
{
case CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_REQUEST:
autodetect_on_connect_time_auto_detect_begin(rdp->autodetect);
switch (autodetect_get_state(rdp->autodetect))
{
case FREERDP_AUTODETECT_STATE_REQUEST:
ret = STATE_RUN_SUCCESS;
if (!rdp_server_transition_to_state(
rdp, CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_RESPONSE))
return STATE_RUN_FAILED;
break;
case FREERDP_AUTODETECT_STATE_COMPLETE:
ret = STATE_RUN_CONTINUE; /* Rerun in next state */
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_LICENSING))
return STATE_RUN_FAILED;
break;
default:
break;
}
break;
case CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_RESPONSE:
ret = peer_recv_pdu(client, s);
if (state_run_success(ret))
{
autodetect_on_connect_time_auto_detect_progress(rdp->autodetect);
switch (autodetect_get_state(rdp->autodetect))
{
case FREERDP_AUTODETECT_STATE_REQUEST:
ret = STATE_RUN_SUCCESS;
break;
case FREERDP_AUTODETECT_STATE_COMPLETE:
ret = STATE_RUN_CONTINUE; /* Rerun in next state */
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_LICENSING))
return STATE_RUN_FAILED;
break;
default:
break;
}
}
break;
default:
WINPR_ASSERT(FALSE);
break;
}
}
else
{
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_LICENSING))
return STATE_RUN_FAILED;
ret = STATE_RUN_CONTINUE; /* Rerun in next state */
}
return ret;
}
static state_run_t peer_recv_handle_licensing(freerdp_peer* client, wStream* s)
{
state_run_t ret = STATE_RUN_FAILED;
rdpRdp* rdp = NULL;
rdpSettings* settings = NULL;
WINPR_ASSERT(client);
WINPR_ASSERT(s);
WINPR_ASSERT(client->context);
rdp = client->context->rdp;
WINPR_ASSERT(rdp);
settings = rdp->settings;
WINPR_ASSERT(settings);
switch (license_get_state(rdp->license))
{
case LICENSE_STATE_INITIAL:
{
const BOOL required =
freerdp_settings_get_bool(settings, FreeRDP_ServerLicenseRequired);
if (required)
{
if (!license_server_configure(rdp->license))
ret = STATE_RUN_FAILED;
else if (!license_server_send_request(rdp->license))
ret = STATE_RUN_FAILED;
else
ret = STATE_RUN_SUCCESS;
}
else
{
if (license_send_valid_client_error_packet(rdp))
ret = STATE_RUN_CONTINUE; /* Rerun in next state, might be capabilities */
}
}
break;
case LICENSE_STATE_COMPLETED:
ret = STATE_RUN_CONTINUE; /* Licensing completed, continue in next state */
break;
case LICENSE_STATE_ABORTED:
ret = STATE_RUN_FAILED;
break;
default:
ret = peer_recv_pdu(client, s);
break;
}
return ret;
}
static state_run_t peer_recv_fastpath_pdu(freerdp_peer* client, wStream* s)
{
rdpRdp* rdp = NULL;
UINT16 length = 0;
BOOL rc = 0;
rdpFastPath* fastpath = NULL;
WINPR_ASSERT(s);
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
rdp = client->context->rdp;
WINPR_ASSERT(rdp);
fastpath = rdp->fastpath;
WINPR_ASSERT(fastpath);
rc = fastpath_read_header_rdp(fastpath, s, &length);
if (!rc || (length == 0))
{
WLog_ERR(TAG, "incorrect FastPath PDU header length %" PRIu16 "", length);
return STATE_RUN_FAILED;
}
if (!Stream_CheckAndLogRequiredLength(TAG, s, length))
return STATE_RUN_FAILED;
if (!fastpath_decrypt(fastpath, s, &length))
return STATE_RUN_FAILED;
rdp->inPackets++;
return fastpath_recv_inputs(fastpath, s);
}
state_run_t peer_recv_pdu(freerdp_peer* client, wStream* s)
{
int rc = tpkt_verify_header(s);
if (rc > 0)
return peer_recv_tpkt_pdu(client, s);
else if (rc == 0)
return peer_recv_fastpath_pdu(client, s);
else
return STATE_RUN_FAILED;
}
static state_run_t peer_unexpected_client_message(rdpRdp* rdp, UINT32 flag)
{
char buffer[1024] = { 0 };
WLog_WARN(TAG, "Unexpected client message in state %s, missing flag %s",
rdp_get_state_string(rdp), rdp_finalize_flags_to_str(flag, buffer, sizeof(buffer)));
return STATE_RUN_SUCCESS; /* we ignore this as per spec input PDU are already allowed */
}
state_run_t rdp_peer_handle_state_demand_active(freerdp_peer* client)
{
state_run_t ret = STATE_RUN_FAILED;
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
rdpRdp* rdp = client->context->rdp;
WINPR_ASSERT(rdp);
if (client->Capabilities && !client->Capabilities(client))
{
WLog_ERR(TAG, "[%s] freerdp_peer::Capabilities() callback failed",
rdp_get_state_string(rdp));
}
else if (!rdp_send_demand_active(rdp))
{
WLog_ERR(TAG, "[%s] rdp_send_demand_active() fail", rdp_get_state_string(rdp));
}
else
{
if (!rdp_server_transition_to_state(rdp,
CONNECTION_STATE_CAPABILITIES_EXCHANGE_MONITOR_LAYOUT))
return STATE_RUN_FAILED;
ret = STATE_RUN_CONTINUE;
}
return ret;
}
/** \brief Handle server peer state ACTIVE:
* On initial run (not connected, not activated) do not read data
*
* \return -1 in case of an error, 0 if no data needs to be processed, 1 to let
* the state machine run again and 2 if peer_recv_pdu must be called.
*/
static state_run_t rdp_peer_handle_state_active(freerdp_peer* client)
{
state_run_t ret = STATE_RUN_FAILED;
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
rdpRdp* rdp = client->context->rdp;
WINPR_ASSERT(rdp);
if (!client->connected)
{
/**
* PostConnect should only be called once and should not
* be called after a reactivation sequence.
*/
IFCALLRET(client->PostConnect, client->connected, client);
}
if (!client->connected)
{
WLog_ERR(TAG, "PostConnect for peer %p failed", client);
ret = STATE_RUN_FAILED;
}
else if (!client->activated)
{
BOOL activated = TRUE;
/* Set client->activated TRUE before calling the Activate callback.
* the Activate callback might reset the client->activated flag even if it returns success
* (e.g. deactivate/reactivate sequence) */
client->activated = TRUE;
IFCALLRET(client->Activate, activated, client);
if (!activated)
{
WLog_ERR(TAG, "Activate for peer %p failed", client);
ret = STATE_RUN_FAILED;
}
else
ret = STATE_RUN_SUCCESS;
}
else
ret = STATE_RUN_ACTIVE;
return ret;
}
static state_run_t peer_recv_callback_internal(rdpTransport* transport, wStream* s, void* extra)
{
UINT32 SelectedProtocol = 0;
freerdp_peer* client = (freerdp_peer*)extra;
rdpRdp* rdp = NULL;
state_run_t ret = STATE_RUN_FAILED;
rdpSettings* settings = NULL;
WINPR_ASSERT(transport);
WINPR_ASSERT(client);
WINPR_ASSERT(client->context);
rdp = client->context->rdp;
WINPR_ASSERT(rdp);
settings = client->context->settings;
WINPR_ASSERT(settings);
IFCALL(client->ReachedState, client, rdp_get_state(rdp));
switch (rdp_get_state(rdp))
{
case CONNECTION_STATE_INITIAL:
if (rdp_server_transition_to_state(rdp, CONNECTION_STATE_NEGO))
ret = STATE_RUN_CONTINUE;
break;
case CONNECTION_STATE_NEGO:
if (!rdp_server_accept_nego(rdp, s))
{
WLog_ERR(TAG, "%s - rdp_server_accept_nego() fail", rdp_get_state_string(rdp));
}
else
{
SelectedProtocol = nego_get_selected_protocol(rdp->nego);
settings->RdstlsSecurity = (SelectedProtocol & PROTOCOL_RDSTLS) ? TRUE : FALSE;
settings->NlaSecurity = (SelectedProtocol & PROTOCOL_HYBRID) ? TRUE : FALSE;
settings->TlsSecurity = (SelectedProtocol & PROTOCOL_SSL) ? TRUE : FALSE;
settings->RdpSecurity = (SelectedProtocol == PROTOCOL_RDP) ? TRUE : FALSE;
if (SelectedProtocol & PROTOCOL_HYBRID)
{
SEC_WINNT_AUTH_IDENTITY_INFO* identity =
(SEC_WINNT_AUTH_IDENTITY_INFO*)nego_get_identity(rdp->nego);
sspi_CopyAuthIdentity(&client->identity, identity);
IFCALLRET(client->Logon, client->authenticated, client, &client->identity,
TRUE);
nego_free_nla(rdp->nego);
}
else
{
IFCALLRET(client->Logon, client->authenticated, client, &client->identity,
FALSE);
}
if (rdp_server_transition_to_state(rdp, CONNECTION_STATE_MCS_CREATE_REQUEST))
ret = STATE_RUN_SUCCESS;
}
break;
case CONNECTION_STATE_NLA:
WINPR_ASSERT(FALSE); // TODO
break;
case CONNECTION_STATE_MCS_CREATE_REQUEST:
if (!rdp_server_accept_mcs_connect_initial(rdp, s))
{
WLog_ERR(TAG,
"%s - "
"rdp_server_accept_mcs_connect_initial() fail",
rdp_get_state_string(rdp));
}
else
ret = STATE_RUN_SUCCESS;
break;
case CONNECTION_STATE_MCS_ERECT_DOMAIN:
if (!rdp_server_accept_mcs_erect_domain_request(rdp, s))
{
WLog_ERR(TAG,
"%s - "
"rdp_server_accept_mcs_erect_domain_request() fail",
rdp_get_state_string(rdp));
}
else
ret = STATE_RUN_SUCCESS;
break;
case CONNECTION_STATE_MCS_ATTACH_USER:
if (!rdp_server_accept_mcs_attach_user_request(rdp, s))
{
WLog_ERR(TAG,
"%s - "
"rdp_server_accept_mcs_attach_user_request() fail",
rdp_get_state_string(rdp));
}
else
ret = STATE_RUN_SUCCESS;
break;
case CONNECTION_STATE_MCS_CHANNEL_JOIN_REQUEST:
if (!rdp_server_accept_mcs_channel_join_request(rdp, s))
{
WLog_ERR(TAG,
"%s - "
"rdp_server_accept_mcs_channel_join_request() fail",
rdp_get_state_string(rdp));
}
else
ret = STATE_RUN_SUCCESS;
break;
case CONNECTION_STATE_RDP_SECURITY_COMMENCEMENT:
ret = STATE_RUN_SUCCESS;
if (!rdp_server_establish_keys(rdp, s))
{
WLog_ERR(TAG,
"%s - "
"rdp_server_establish_keys() fail",
rdp_get_state_string(rdp));
ret = STATE_RUN_FAILED;
}
if (state_run_success(ret))
{
if (!rdp_server_transition_to_state(rdp, CONNECTION_STATE_SECURE_SETTINGS_EXCHANGE))
ret = STATE_RUN_FAILED;
else if (Stream_GetRemainingLength(s) > 0)
ret = STATE_RUN_CONTINUE; /* Rerun function */
}
break;
case CONNECTION_STATE_SECURE_SETTINGS_EXCHANGE:
if (rdp_recv_client_info(rdp, s))
{
if (rdp_server_transition_to_state(
rdp, CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_REQUEST))
ret = STATE_RUN_CONTINUE;
}
break;
case CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_REQUEST:
case CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_RESPONSE:
ret = peer_recv_handle_auto_detect(client, s);
break;
case CONNECTION_STATE_LICENSING:
ret = peer_recv_handle_licensing(client, s);
if (ret == STATE_RUN_CONTINUE)
{
if (!rdp_server_transition_to_state(
rdp, CONNECTION_STATE_MULTITRANSPORT_BOOTSTRAPPING_REQUEST))
ret = STATE_RUN_FAILED;
}
break;
case CONNECTION_STATE_MULTITRANSPORT_BOOTSTRAPPING_REQUEST:
if (settings->SupportMultitransport &&
((settings->MultitransportFlags & INITIATE_REQUEST_PROTOCOL_UDPFECR) != 0))
{
/* only UDP reliable for now, nobody does lossy UDP (MS-RDPUDP only) these days */
ret = multitransport_server_request(rdp->multitransport,
INITIATE_REQUEST_PROTOCOL_UDPFECR);
switch (ret)
{
case STATE_RUN_SUCCESS:
rdp_server_transition_to_state(
rdp, CONNECTION_STATE_MULTITRANSPORT_BOOTSTRAPPING_RESPONSE);
break;
case STATE_RUN_CONTINUE:
/* mismatch on the supported kind of UDP transports */
rdp_server_transition_to_state(
rdp, CONNECTION_STATE_CAPABILITIES_EXCHANGE_DEMAND_ACTIVE);
break;
default:
break;
}
}
else
{
if (rdp_server_transition_to_state(
rdp, CONNECTION_STATE_CAPABILITIES_EXCHANGE_DEMAND_ACTIVE))
ret = STATE_RUN_CONTINUE; /* Rerun, initialize next state */
}
break;
case CONNECTION_STATE_MULTITRANSPORT_BOOTSTRAPPING_RESPONSE:
ret = peer_recv_pdu(client, s);
break;
case CONNECTION_STATE_CAPABILITIES_EXCHANGE_DEMAND_ACTIVE:
ret = rdp_peer_handle_state_demand_active(client);
break;
case CONNECTION_STATE_CAPABILITIES_EXCHANGE_MONITOR_LAYOUT:
if (freerdp_settings_get_bool(settings, FreeRDP_SupportMonitorLayoutPdu))
{
MONITOR_DEF* monitors = NULL;
IFCALL(client->AdjustMonitorsLayout, client);
/* client supports the monitorLayout PDU, let's send him the monitors if any */
ret = STATE_RUN_SUCCESS;