Repository navigation
Expand file tree
/
Copy pathpublickey.c
More file actions
1297 lines (1143 loc) · 48.8 KB
/
Copy pathpublickey.c
File metadata and controls
1297 lines (1143 loc) · 48.8 KB
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
/* Copyright (C) Sara Golemon <sarag@libssh2.org>
* Copyright (C) Daniel Stenberg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "libssh2_priv.h"
#include "libssh2_publickey.h"
#include "channel.h"
#include "session.h"
#define SSH2_PUBLICKEY_VERSION 2
/* Numericised response codes -- Not IETF, but local representation */
#define SSH2_PUBLICKEY_RESPONSE_STATUS 0
#define SSH2_PUBLICKEY_RESPONSE_VERSION 1
#define SSH2_PUBLICKEY_RESPONSE_PUBLICKEY 2
struct publickey_code_list {
const char *name;
int name_len;
int code;
};
#define STRLEN(s) s, sizeof(s) - 1
static const struct publickey_code_list publickey_response_codes[] = {
{ STRLEN("status"), SSH2_PUBLICKEY_RESPONSE_STATUS },
{ STRLEN("version"), SSH2_PUBLICKEY_RESPONSE_VERSION },
{ STRLEN("publickey"), SSH2_PUBLICKEY_RESPONSE_PUBLICKEY },
{ NULL, 0, 0 }
};
/* PUBLICKEY status codes -- IETF defined */
#define SSH2_PUBLICKEY_SUCCESS 0
#define SSH2_PUBLICKEY_ACCESS_DENIED 1
#define SSH2_PUBLICKEY_STORAGE_EXCEEDED 2
#define SSH2_PUBLICKEY_VERSION_NOT_SUPPORTED 3
#define SSH2_PUBLICKEY_KEY_NOT_FOUND 4
#define SSH2_PUBLICKEY_KEY_NOT_SUPPORTED 5
#define SSH2_PUBLICKEY_KEY_ALREADY_PRESENT 6
#define SSH2_PUBLICKEY_GENERAL_FAILURE 7
#define SSH2_PUBLICKEY_REQUEST_NOT_SUPPORTED 8
#define SSH2_PUBLICKEY_STATUS_CODE_MAX 8
static const struct publickey_code_list publickey_status_codes[] = {
{ STRLEN("success"), SSH2_PUBLICKEY_SUCCESS },
{ STRLEN("access denied"), SSH2_PUBLICKEY_ACCESS_DENIED },
{ STRLEN("storage exceeded"), SSH2_PUBLICKEY_STORAGE_EXCEEDED },
{ STRLEN("version not supported"), SSH2_PUBLICKEY_VERSION_NOT_SUPPORTED },
{ STRLEN("key not found"), SSH2_PUBLICKEY_KEY_NOT_FOUND },
{ STRLEN("key not supported"), SSH2_PUBLICKEY_KEY_NOT_SUPPORTED },
{ STRLEN("key already present"), SSH2_PUBLICKEY_KEY_ALREADY_PRESENT },
{ STRLEN("general failure"), SSH2_PUBLICKEY_GENERAL_FAILURE },
{ STRLEN("request not supported"), SSH2_PUBLICKEY_REQUEST_NOT_SUPPORTED },
{ NULL, 0, 0 }
};
#undef STRLEN
/*
* Format an error message from a status code
*/
static void publickey_status_error(const LIBSSH2_PUBLICKEY *pkey,
LIBSSH2_SESSION *session,
unsigned long status)
{
const char *msg;
/* GENERAL_FAILURE got remapped between version 1 and 2 */
if(status == 6 && pkey && pkey->version == 1)
status = 7;
if(status > SSH2_PUBLICKEY_STATUS_CODE_MAX)
msg = "unknown";
else
msg = publickey_status_codes[status].name;
ssh2_err(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL, msg);
}
/*
* Read a packet from the subsystem
*/
static int publickey_packet_receive(LIBSSH2_PUBLICKEY *pkey,
unsigned char **data, size_t *data_len)
{
LIBSSH2_CHANNEL *channel = pkey->channel;
LIBSSH2_SESSION *session = channel->session;
unsigned char buffer[4];
ssize_t rc;
*data = NULL; /* default to nothing returned */
*data_len = 0;
if(pkey->receive_state == ssh2_NB_state_idle) {
rc = ssh2_channel_read(channel, 0, (char *)buffer, 4);
if(rc == LIBSSH2_ERROR_EAGAIN)
return (int)rc;
else if(rc != 4)
return ssh2_err(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL,
"Invalid response from publickey subsystem");
pkey->receive_packet_len = ssh2_ntohu32(buffer);
if(pkey->receive_packet_len > LIBSSH2_PACKET_MAXPAYLOAD)
return ssh2_err(session, LIBSSH2_ERROR_OUT_OF_BOUNDARY,
"Too large publickey packet");
pkey->receive_packet = SSH2_ALLOC(session, pkey->receive_packet_len);
if(!pkey->receive_packet)
return ssh2_err(session, LIBSSH2_ERROR_ALLOC,
"Unable to allocate publickey response buffer");
pkey->receive_state = ssh2_NB_state_sent;
}
if(pkey->receive_state == ssh2_NB_state_sent) {
rc = ssh2_channel_read(channel, 0, (char *)pkey->receive_packet,
pkey->receive_packet_len);
if(rc == LIBSSH2_ERROR_EAGAIN)
return (int)rc;
else if(rc != (ssize_t)pkey->receive_packet_len) {
SSH2_SAFEFREE(session, pkey->receive_packet);
pkey->receive_state = ssh2_NB_state_idle;
return ssh2_err(session, LIBSSH2_ERROR_SOCKET_TIMEOUT,
"Timeout waiting for publickey subsystem "
"response packet");
}
*data = pkey->receive_packet;
*data_len = pkey->receive_packet_len;
pkey->receive_packet = NULL;
pkey->receive_packet_len = 0;
}
pkey->receive_state = ssh2_NB_state_idle;
return 0;
}
/*
* Translate a string response name to a numeric code
* Data is incremented by 4 + response_len on success only
*/
static int publickey_response_id(unsigned char **pdata, size_t data_len)
{
size_t response_len;
unsigned char *data = *pdata;
const struct publickey_code_list *codes = publickey_response_codes;
if(data_len < 4)
return -1; /* Malformed response */
response_len = ssh2_ntohu32(data);
data += 4;
data_len -= 4;
if(data_len < response_len)
return -1; /* Malformed response */
while(codes->name) {
if((unsigned long)codes->name_len == response_len &&
!strncmp(codes->name, (const char *)data, response_len)) {
*pdata = data + response_len;
return codes->code;
}
codes++;
}
return -1;
}
/*
* Generic helper routine to wait for success response and nothing else
*/
static int publickey_response_success(LIBSSH2_PUBLICKEY *pkey)
{
LIBSSH2_SESSION *session = pkey->channel->session;
unsigned char *data, *s;
size_t data_len;
int response;
for(;;) {
int rc = publickey_packet_receive(pkey, &data, &data_len);
if(rc == LIBSSH2_ERROR_EAGAIN)
return rc;
else if(rc)
return ssh2_err(session, LIBSSH2_ERROR_SOCKET_TIMEOUT,
"Timeout waiting for response from "
"publickey subsystem");
if(data_len < 4) {
SSH2_FREE(session, data);
return ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"Publickey response too small");
}
s = data;
response = publickey_response_id(&s, data_len);
switch(response) {
case SSH2_PUBLICKEY_RESPONSE_STATUS: {
/* Error, or processing complete */
unsigned long status = 0;
if(data_len < (size_t)(s - data) + 4) {
SSH2_FREE(session, data);
return ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"Publickey response too small");
}
status = ssh2_ntohu32(s);
SSH2_FREE(session, data);
if(status == SSH2_PUBLICKEY_SUCCESS)
return 0;
publickey_status_error(pkey, session, status);
goto err_exit;
}
default:
SSH2_FREE(session, data);
if(response < 0)
return ssh2_err(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL,
"Invalid publickey subsystem response");
/* Unknown/Unexpected */
ssh2_err(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL,
"Unexpected publickey subsystem response");
data = NULL;
}
}
err_exit:
return -1;
}
/* ***************
* Publickey API *
*************** */
/*
* Startup the publickey subsystem
*/
static LIBSSH2_PUBLICKEY *publickey_init(LIBSSH2_SESSION *session)
{
int response;
int rc;
if(session->pkeyInit_state == ssh2_NB_state_idle) {
session->pkeyInit_data = NULL;
session->pkeyInit_pkey = NULL;
session->pkeyInit_channel = NULL;
ssh2_deb((session, LIBSSH2_TRACE_PUBLICKEY,
"Initializing publickey subsystem"));
session->pkeyInit_state = ssh2_NB_state_allocated;
}
if(session->pkeyInit_state == ssh2_NB_state_allocated) {
session->pkeyInit_channel =
ssh2_channel_open(session, "session", sizeof("session") - 1,
LIBSSH2_CHANNEL_WINDOW_DEFAULT,
LIBSSH2_CHANNEL_PACKET_DEFAULT, NULL, 0);
if(!session->pkeyInit_channel) {
if(libssh2_session_last_errno(session) == LIBSSH2_ERROR_EAGAIN)
/* The error state is already set, so leave it */
return NULL;
ssh2_err(session, LIBSSH2_ERROR_CHANNEL_FAILURE,
"Unable to startup channel");
goto err_exit;
}
session->pkeyInit_state = ssh2_NB_state_sent;
}
if(session->pkeyInit_state == ssh2_NB_state_sent) {
rc = ssh2_channel_process_startup(session->pkeyInit_channel,
"subsystem",
sizeof("subsystem") - 1,
"publickey",
sizeof("publickey") - 1);
if(rc == LIBSSH2_ERROR_EAGAIN) {
ssh2_err(session, LIBSSH2_ERROR_EAGAIN,
"Would block starting publickey subsystem");
return NULL;
}
else if(rc) {
ssh2_err(session, LIBSSH2_ERROR_CHANNEL_FAILURE,
"Unable to request publickey subsystem");
goto err_exit;
}
session->pkeyInit_state = ssh2_NB_state_sent1;
}
if(session->pkeyInit_state == ssh2_NB_state_sent1) {
unsigned char *s;
rc = ssh2_channel_extended_data(session->pkeyInit_channel,
LIBSSH2_CHANNEL_EXTENDED_DATA_IGNORE);
if(rc == LIBSSH2_ERROR_EAGAIN) {
ssh2_err(session, LIBSSH2_ERROR_EAGAIN,
"Would block starting publickey subsystem");
return NULL;
}
session->pkeyInit_pkey =
SSH2_CALLOC(session, sizeof(LIBSSH2_PUBLICKEY));
if(!session->pkeyInit_pkey) {
ssh2_err(session, LIBSSH2_ERROR_ALLOC,
"Unable to allocate a new publickey structure");
goto err_exit;
}
session->pkeyInit_pkey->channel = session->pkeyInit_channel;
session->pkeyInit_pkey->version = 0;
s = session->pkeyInit_buffer;
ssh2_htonu32(s, 4 + (sizeof("version") - 1) + 4);
s += 4;
ssh2_htonu32(s, sizeof("version") - 1);
s += 4;
memcpy(s, "version", sizeof("version") - 1);
s += sizeof("version") - 1;
ssh2_htonu32(s, SSH2_PUBLICKEY_VERSION);
session->pkeyInit_buffer_sent = 0;
ssh2_deb((session, LIBSSH2_TRACE_PUBLICKEY,
"Sending publickey advertising version %d support",
(int)SSH2_PUBLICKEY_VERSION));
session->pkeyInit_state = ssh2_NB_state_sent2;
}
if(session->pkeyInit_state == ssh2_NB_state_sent2) {
ssize_t nwritten;
nwritten = ssh2_channel_write(session->pkeyInit_channel, 0,
session->pkeyInit_buffer,
sizeof(session->pkeyInit_buffer) -
session->pkeyInit_buffer_sent);
if(nwritten == LIBSSH2_ERROR_EAGAIN) {
ssh2_err(session, LIBSSH2_ERROR_EAGAIN,
"Would block sending publickey version packet");
return NULL;
}
else if(nwritten < 0) {
ssh2_err(session, (int)nwritten,
"Unable to send publickey version packet");
goto err_exit;
}
session->pkeyInit_buffer_sent += nwritten;
if(session->pkeyInit_buffer_sent < sizeof(session->pkeyInit_buffer)) {
ssh2_err(session, LIBSSH2_ERROR_EAGAIN,
"Need to be called again to complete this");
return NULL;
}
session->pkeyInit_state = ssh2_NB_state_sent3;
}
if(session->pkeyInit_state == ssh2_NB_state_sent3) {
for(;;) {
unsigned char *s;
rc = publickey_packet_receive(session->pkeyInit_pkey,
&session->pkeyInit_data,
&session->pkeyInit_data_len);
if(rc == LIBSSH2_ERROR_EAGAIN) {
ssh2_err(session, LIBSSH2_ERROR_EAGAIN,
"Would block waiting for response from "
"publickey subsystem");
return NULL;
}
else if(rc) {
ssh2_err(session, LIBSSH2_ERROR_SOCKET_TIMEOUT,
"Timeout waiting for response from "
"publickey subsystem");
goto err_exit;
}
s = session->pkeyInit_data;
response = publickey_response_id(&s, session->pkeyInit_data_len);
if(response < 0) {
ssh2_err(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL,
"Invalid publickey subsystem response code");
goto err_exit;
}
switch(response) {
case SSH2_PUBLICKEY_RESPONSE_STATUS: {
/* Error */
unsigned long status, descr_len, lang_len;
if(session->pkeyInit_data_len <
(size_t)(s - session->pkeyInit_data) + 8) {
ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"Public key init data too small");
goto err_exit;
}
status = ssh2_ntohu32(s);
s += 4;
descr_len = ssh2_ntohu32(s);
s += 4;
if(descr_len > LIBSSH2_PACKET_MAXPAYLOAD) {
ssh2_err(session, LIBSSH2_ERROR_OUT_OF_BOUNDARY,
"Public key description too large");
goto err_exit;
}
if(session->pkeyInit_data_len <
(size_t)(s - session->pkeyInit_data) + descr_len + 4) {
ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"Public key init data too small");
goto err_exit;
}
/* description starts here */
s += descr_len;
lang_len = ssh2_ntohu32(s);
s += 4;
if(lang_len > LIBSSH2_PACKET_MAXPAYLOAD) {
ssh2_err(session, LIBSSH2_ERROR_OUT_OF_BOUNDARY,
"Public key language too large");
goto err_exit;
}
if(session->pkeyInit_data_len <
(size_t)(s - session->pkeyInit_data) + lang_len) {
ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"Public key init data too small");
goto err_exit;
}
/* lang starts here */
s += lang_len;
if(session->pkeyInit_data_len <
(size_t)(s - session->pkeyInit_data)) {
ssh2_err(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL,
"Malformed publickey subsystem packet");
goto err_exit;
}
publickey_status_error(NULL, session, status);
goto err_exit;
}
case SSH2_PUBLICKEY_RESPONSE_VERSION:
/* What we want */
if(session->pkeyInit_data_len <
(size_t)(s - session->pkeyInit_data) + 4) {
ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"Public key version response too small");
goto err_exit;
}
session->pkeyInit_pkey->version = ssh2_ntohu32(s);
if(session->pkeyInit_pkey->version > SSH2_PUBLICKEY_VERSION) {
ssh2_deb((session, LIBSSH2_TRACE_PUBLICKEY,
"Truncate remote publickey version from %u",
session->pkeyInit_pkey->version));
session->pkeyInit_pkey->version = SSH2_PUBLICKEY_VERSION;
}
ssh2_deb((session, LIBSSH2_TRACE_PUBLICKEY,
"Enabling publickey subsystem version %u",
session->pkeyInit_pkey->version));
SSH2_SAFEFREE(session, session->pkeyInit_data);
session->pkeyInit_state = ssh2_NB_state_idle;
return session->pkeyInit_pkey;
default:
/* Unknown/Unexpected */
ssh2_err(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL,
"Unexpected publickey subsystem response, ignoring");
SSH2_SAFEFREE(session, session->pkeyInit_data);
}
}
}
/* Never reached except by direct goto */
err_exit:
session->pkeyInit_state = ssh2_NB_state_sent4;
if(session->pkeyInit_channel) {
rc = ssh2_channel_close(session->pkeyInit_channel);
if(rc == LIBSSH2_ERROR_EAGAIN) {
ssh2_err(session, LIBSSH2_ERROR_EAGAIN,
"Would block closing channel");
return NULL;
}
}
if(session->pkeyInit_pkey)
SSH2_SAFEFREE(session, session->pkeyInit_pkey);
if(session->pkeyInit_data)
SSH2_SAFEFREE(session, session->pkeyInit_data);
session->pkeyInit_state = ssh2_NB_state_idle;
return NULL;
}
/*
* Startup the publickey subsystem
*/
LIBSSH2_PUBLICKEY *libssh2_publickey_init(LIBSSH2_SESSION *session)
{
LIBSSH2_PUBLICKEY *ptr;
if(!session)
return NULL;
BLOCK_ADJUST_ERRNO(ptr, session, publickey_init(session));
return ptr;
}
#define PUBLICKEY_ATTRS_MAX 1024
/*
* Add a new public key entry
*/
int libssh2_publickey_add_ex(LIBSSH2_PUBLICKEY *pkey,
const unsigned char *name, unsigned long name_len,
const unsigned char *blob, unsigned long blob_len,
char overwrite,
unsigned long num_attrs,
const libssh2_publickey_attribute attrs[])
{
LIBSSH2_CHANNEL *channel;
LIBSSH2_SESSION *session;
unsigned long i, packet_len;
const char *comment = NULL;
unsigned long comment_len = 0;
int rc;
if(!pkey || !name || !blob || (num_attrs && !attrs))
return LIBSSH2_ERROR_BAD_USE;
if(name_len > LIBSSH2_PACKET_MAXPAYLOAD ||
blob_len > LIBSSH2_PACKET_MAXPAYLOAD ||
num_attrs > PUBLICKEY_ATTRS_MAX)
return LIBSSH2_ERROR_OUT_OF_BOUNDARY;
/* 19 = packet_len(4) + add_len(4) + "add"(3) + name_len(4) + {name}
blob_len(4) + {blob} */
packet_len = 19 + name_len + blob_len;
channel = pkey->channel;
session = channel->session;
if(pkey->add_state == ssh2_NB_state_idle) {
pkey->add_packet = NULL;
ssh2_deb((session, LIBSSH2_TRACE_PUBLICKEY, "Adding %.*s publickey",
(int)name_len, name));
if(pkey->version == 1) {
for(i = 0; i < num_attrs; i++) {
/* Search for a comment attribute */
if(attrs[i].name_len == (sizeof("comment") - 1) &&
attrs[i].name &&
!strncmp(attrs[i].name, "comment", sizeof("comment") - 1)) {
if(!attrs[i].value)
return LIBSSH2_ERROR_BAD_USE;
if(attrs[i].value_len > LIBSSH2_PACKET_MAXPAYLOAD)
return LIBSSH2_ERROR_OUT_OF_BOUNDARY;
comment = attrs[i].value;
comment_len = attrs[i].value_len;
break;
}
}
packet_len += 4 + comment_len;
}
else {
packet_len += 5; /* overwrite(1) + attribute_count(4) */
for(i = 0; i < num_attrs; i++) {
if(!attrs[i].name ||
!attrs[i].value)
return LIBSSH2_ERROR_BAD_USE;
if(attrs[i].name_len > LIBSSH2_PACKET_MAXPAYLOAD ||
attrs[i].value_len > LIBSSH2_PACKET_MAXPAYLOAD)
return LIBSSH2_ERROR_OUT_OF_BOUNDARY;
/* name_len(4) + value_len(4) + mandatory(1) */
packet_len += 9 + attrs[i].name_len + attrs[i].value_len;
}
}
if((packet_len - 4) > LIBSSH2_PACKET_MAXPAYLOAD)
return ssh2_err(session, LIBSSH2_ERROR_OUT_OF_BOUNDARY,
"Packet too large");
pkey->add_packet = SSH2_ALLOC(session, packet_len);
if(!pkey->add_packet)
return ssh2_err(session, LIBSSH2_ERROR_ALLOC,
"Unable to allocate memory for "
"publickey 'add' packet");
pkey->add_s = pkey->add_packet;
ssh2_htonu32(pkey->add_s, (uint32_t)(packet_len - 4));
pkey->add_s += 4;
ssh2_htonu32(pkey->add_s, sizeof("add") - 1);
pkey->add_s += 4;
memcpy(pkey->add_s, "add", sizeof("add") - 1);
pkey->add_s += sizeof("add") - 1;
if(pkey->version == 1) {
ssh2_htonu32(pkey->add_s, (uint32_t)comment_len);
pkey->add_s += 4;
if(comment) {
memcpy(pkey->add_s, comment, comment_len);
pkey->add_s += comment_len;
}
ssh2_htonu32(pkey->add_s, (uint32_t)name_len);
pkey->add_s += 4;
memcpy(pkey->add_s, name, name_len);
pkey->add_s += name_len;
ssh2_htonu32(pkey->add_s, (uint32_t)blob_len);
pkey->add_s += 4;
memcpy(pkey->add_s, blob, blob_len);
pkey->add_s += blob_len;
}
else {
/* Version == 2 */
ssh2_htonu32(pkey->add_s, (uint32_t)name_len);
pkey->add_s += 4;
memcpy(pkey->add_s, name, name_len);
pkey->add_s += name_len;
ssh2_htonu32(pkey->add_s, (uint32_t)blob_len);
pkey->add_s += 4;
memcpy(pkey->add_s, blob, blob_len);
pkey->add_s += blob_len;
*(pkey->add_s++) = overwrite ? 0x01 : 0;
ssh2_htonu32(pkey->add_s, (uint32_t)num_attrs);
pkey->add_s += 4;
for(i = 0; i < num_attrs; i++) {
ssh2_htonu32(pkey->add_s, (uint32_t)attrs[i].name_len);
pkey->add_s += 4;
memcpy(pkey->add_s, attrs[i].name, attrs[i].name_len);
pkey->add_s += attrs[i].name_len;
ssh2_htonu32(pkey->add_s, (uint32_t)attrs[i].value_len);
pkey->add_s += 4;
memcpy(pkey->add_s, attrs[i].value, attrs[i].value_len);
pkey->add_s += attrs[i].value_len;
*(pkey->add_s++) = attrs[i].mandatory ? 0x01 : 0;
}
}
ssh2_deb((session, LIBSSH2_TRACE_PUBLICKEY,
"Sending publickey 'add' packet: "
"type=%.*s blob_len=%lu num_attrs=%lu",
(int)name_len, name, blob_len, num_attrs));
pkey->add_state = ssh2_NB_state_created;
}
if(pkey->add_state == ssh2_NB_state_created) {
ssize_t nwritten;
nwritten = ssh2_channel_write(channel, 0, pkey->add_packet,
(pkey->add_s - pkey->add_packet));
if(nwritten == LIBSSH2_ERROR_EAGAIN)
return (int)nwritten;
else if((pkey->add_s - pkey->add_packet) != nwritten) {
SSH2_SAFEFREE(session, pkey->add_packet);
return ssh2_err(session, LIBSSH2_ERROR_SOCKET_SEND,
"Unable to send publickey add packet");
}
SSH2_SAFEFREE(session, pkey->add_packet);
pkey->add_state = ssh2_NB_state_sent;
}
rc = publickey_response_success(pkey);
if(rc == LIBSSH2_ERROR_EAGAIN)
return rc;
pkey->add_state = ssh2_NB_state_idle;
return rc;
}
/*
* Remove an existing publickey so that authentication can no longer be
* performed using it
*/
int libssh2_publickey_remove_ex(LIBSSH2_PUBLICKEY *pkey,
const unsigned char *name,
unsigned long name_len,
const unsigned char *blob,
unsigned long blob_len)
{
LIBSSH2_CHANNEL *channel;
LIBSSH2_SESSION *session;
unsigned long packet_len;
int rc;
if(!pkey || !name || !blob)
return LIBSSH2_ERROR_BAD_USE;
if(name_len > LIBSSH2_PACKET_MAXPAYLOAD ||
blob_len > LIBSSH2_PACKET_MAXPAYLOAD)
return LIBSSH2_ERROR_OUT_OF_BOUNDARY;
/* 22 = packet_len(4) + remove_len(4) + "remove"(6) + name_len(4) + {name}
+ blob_len(4) + {blob} */
packet_len = 22 + name_len + blob_len;
channel = pkey->channel;
session = channel->session;
if(pkey->remove_state == ssh2_NB_state_idle) {
pkey->remove_packet = NULL;
if((packet_len - 4) > LIBSSH2_PACKET_MAXPAYLOAD)
return ssh2_err(session, LIBSSH2_ERROR_OUT_OF_BOUNDARY,
"Packet too large");
pkey->remove_packet = SSH2_ALLOC(session, packet_len);
if(!pkey->remove_packet)
return ssh2_err(session, LIBSSH2_ERROR_ALLOC,
"Unable to allocate memory for "
"publickey 'remove' packet");
pkey->remove_s = pkey->remove_packet;
ssh2_htonu32(pkey->remove_s, (uint32_t)(packet_len - 4));
pkey->remove_s += 4;
ssh2_htonu32(pkey->remove_s, sizeof("remove") - 1);
pkey->remove_s += 4;
memcpy(pkey->remove_s, "remove", sizeof("remove") - 1);
pkey->remove_s += sizeof("remove") - 1;
ssh2_htonu32(pkey->remove_s, (uint32_t)name_len);
pkey->remove_s += 4;
memcpy(pkey->remove_s, name, name_len);
pkey->remove_s += name_len;
ssh2_htonu32(pkey->remove_s, (uint32_t)blob_len);
pkey->remove_s += 4;
memcpy(pkey->remove_s, blob, blob_len);
pkey->remove_s += blob_len;
ssh2_deb((session, LIBSSH2_TRACE_PUBLICKEY,
"Sending publickey 'remove' packet: type=%.*s blob_len=%lu",
(int)name_len, name, blob_len));
pkey->remove_state = ssh2_NB_state_created;
}
if(pkey->remove_state == ssh2_NB_state_created) {
ssize_t nwritten;
nwritten = ssh2_channel_write(channel, 0, pkey->remove_packet,
(pkey->remove_s - pkey->remove_packet));
if(nwritten == LIBSSH2_ERROR_EAGAIN)
return (int)nwritten;
else if((pkey->remove_s - pkey->remove_packet) != nwritten) {
SSH2_SAFEFREE(session, pkey->remove_packet);
pkey->remove_state = ssh2_NB_state_idle;
return ssh2_err(session, LIBSSH2_ERROR_SOCKET_SEND,
"Unable to send publickey remove packet");
}
SSH2_SAFEFREE(session, pkey->remove_packet);
pkey->remove_state = ssh2_NB_state_sent;
}
rc = publickey_response_success(pkey);
if(rc == LIBSSH2_ERROR_EAGAIN)
return rc;
pkey->remove_state = ssh2_NB_state_idle;
return rc;
}
/*
* Fetch a list of supported public keys from a server
*/
int libssh2_publickey_list_fetch(LIBSSH2_PUBLICKEY *pkey,
unsigned long *num_keys,
libssh2_publickey_list **pkey_list)
{
LIBSSH2_CHANNEL *channel;
LIBSSH2_SESSION *session;
libssh2_publickey_list *list;
/* 12 = packet_len(4) + list_len(4) + "list"(4) */
unsigned long buffer_len = 12, keys, max_keys, i;
int response;
int rc;
if(!pkey)
return LIBSSH2_ERROR_BAD_USE;
channel = pkey->channel;
session = channel->session;
if(pkey->listFetch_state == ssh2_NB_state_idle) {
pkey->listFetch_data = NULL;
pkey->listFetch_list = NULL;
pkey->listFetch_keys = 0;
pkey->listFetch_max_keys = 0;
pkey->listFetch_s = pkey->listFetch_buffer;
ssh2_htonu32(pkey->listFetch_s, (uint32_t)(buffer_len - 4));
pkey->listFetch_s += 4;
ssh2_htonu32(pkey->listFetch_s, sizeof("list") - 1);
pkey->listFetch_s += 4;
memcpy(pkey->listFetch_s, "list", sizeof("list") - 1);
pkey->listFetch_s += sizeof("list") - 1;
ssh2_deb((session, LIBSSH2_TRACE_PUBLICKEY,
"Sending publickey 'list' packet"));
pkey->listFetch_state = ssh2_NB_state_created;
}
list = pkey->listFetch_list;
keys = pkey->listFetch_keys;
max_keys = pkey->listFetch_max_keys;
if(pkey->listFetch_state == ssh2_NB_state_created) {
ssize_t nwritten;
nwritten = ssh2_channel_write(channel, 0,
pkey->listFetch_buffer,
(pkey->listFetch_s -
pkey->listFetch_buffer));
if(nwritten == LIBSSH2_ERROR_EAGAIN)
return (int)nwritten;
else if((pkey->listFetch_s - pkey->listFetch_buffer) != nwritten) {
pkey->listFetch_state = ssh2_NB_state_idle;
return ssh2_err(session, LIBSSH2_ERROR_SOCKET_SEND,
"Unable to send publickey list packet");
}
pkey->listFetch_state = ssh2_NB_state_sent;
}
for(;;) {
rc = publickey_packet_receive(pkey, &pkey->listFetch_data,
&pkey->listFetch_data_len);
if(rc == LIBSSH2_ERROR_EAGAIN) {
pkey->listFetch_list = list;
pkey->listFetch_keys = keys;
pkey->listFetch_max_keys = max_keys;
return rc;
}
else if(rc) {
ssh2_err(session, LIBSSH2_ERROR_SOCKET_TIMEOUT,
"Timeout waiting for response from publickey subsystem");
goto err_exit;
}
pkey->listFetch_s = pkey->listFetch_data;
response = publickey_response_id(&pkey->listFetch_s,
pkey->listFetch_data_len);
if(response < 0) {
ssh2_err(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL,
"Invalid publickey subsystem response code");
goto err_exit;
}
switch(response) {
case SSH2_PUBLICKEY_RESPONSE_STATUS: {
/* Error, or processing complete */
unsigned long status, descr_len, lang_len;
if(pkey->listFetch_data_len <
(size_t)(pkey->listFetch_s - pkey->listFetch_data) + 8) {
ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"ListFetch data too short");
goto err_exit;
}
status = ssh2_ntohu32(pkey->listFetch_s);
pkey->listFetch_s += 4;
descr_len = ssh2_ntohu32(pkey->listFetch_s);
pkey->listFetch_s += 4;
if(descr_len > LIBSSH2_PACKET_MAXPAYLOAD) {
ssh2_err(session, LIBSSH2_ERROR_OUT_OF_BOUNDARY,
"Public key description too large");
goto err_exit;
}
if(pkey->listFetch_data_len <
(size_t)(pkey->listFetch_s - pkey->listFetch_data) +
descr_len + 4) {
ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"ListFetch data too short");
goto err_exit;
}
/* description starts at pkey->listFetch_s */
pkey->listFetch_s += descr_len;
lang_len = ssh2_ntohu32(pkey->listFetch_s);
pkey->listFetch_s += 4;
if(lang_len > LIBSSH2_PACKET_MAXPAYLOAD) {
ssh2_err(session, LIBSSH2_ERROR_OUT_OF_BOUNDARY,
"Public key language too large");
goto err_exit;
}
if(pkey->listFetch_data_len <
(size_t)(pkey->listFetch_s - pkey->listFetch_data) + lang_len) {
ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"ListFetch data too short");
goto err_exit;
}
/* lang starts at pkey->listFetch_s */
pkey->listFetch_s += lang_len;
if(pkey->listFetch_data_len <
(size_t)(pkey->listFetch_s - pkey->listFetch_data)) {
ssh2_err(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL,
"Malformed publickey subsystem packet");
goto err_exit;
}
if(status == SSH2_PUBLICKEY_SUCCESS) {
SSH2_SAFEFREE(session, pkey->listFetch_data);
*pkey_list = list;
*num_keys = keys;
pkey->listFetch_list = NULL;
pkey->listFetch_keys = 0;
pkey->listFetch_max_keys = 0;
pkey->listFetch_state = ssh2_NB_state_idle;
return 0;
}
publickey_status_error(pkey, session, status);
goto err_exit;
}
case SSH2_PUBLICKEY_RESPONSE_PUBLICKEY:
/* What we want */
if(keys >= 32768) {
ssh2_err(session, LIBSSH2_ERROR_OUT_OF_BOUNDARY,
"Too many public keys");
goto err_exit;
}
if(keys >= max_keys) {
libssh2_publickey_list *newlist;
/* Grow the key list if necessary */
max_keys += 8;
newlist = SSH2_REALLOC(session, list,
(max_keys + 1) *
sizeof(libssh2_publickey_list));
if(!newlist) {
ssh2_err(session, LIBSSH2_ERROR_ALLOC,
"Unable to allocate memory for publickey list");
goto err_exit;
}
list = newlist;
memset(&list[keys], 0,
(max_keys - keys + 1) * sizeof(list[keys]));
}
if(pkey->version == 1) {
unsigned long comment_len;
if(pkey->listFetch_data_len <
(size_t)(pkey->listFetch_s - pkey->listFetch_data) + 4) {
ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"ListFetch data too short");
goto err_exit;
}
comment_len = ssh2_ntohu32(pkey->listFetch_s);
pkey->listFetch_s += 4;
if(comment_len) {
if(comment_len > LIBSSH2_PACKET_MAXPAYLOAD) {
ssh2_err(session, LIBSSH2_ERROR_OUT_OF_BOUNDARY,
"Public key comment too large");
goto err_exit;
}
if(pkey->listFetch_data_len <
(size_t)(pkey->listFetch_s - pkey->listFetch_data) +
comment_len) {
ssh2_err(session, LIBSSH2_ERROR_BUFFER_TOO_SMALL,
"ListFetch data too short");
goto err_exit;
}
list[keys].num_attrs = 1;
list[keys].attrs =
SSH2_ALLOC(session,
sizeof(libssh2_publickey_attribute));
if(!list[keys].attrs) {
ssh2_err(session, LIBSSH2_ERROR_ALLOC,
"Unable to allocate memory for "
"publickey attributes");
goto err_exit;