/
schannel.c
2812 lines (2459 loc) · 92.8 KB
/
schannel.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
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) Marc Hoersken, <info@marc-hoersken.de>
* Copyright (C) Mark Salisbury, <mark.salisbury@hp.com>
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
/*
* Source file for all Schannel-specific code for the TLS/SSL layer. No code
* but vtls.c should ever call or use these functions.
*/
#include "curl_setup.h"
#ifdef USE_SCHANNEL
#ifndef USE_WINDOWS_SSPI
# error "Can't compile SCHANNEL support without SSPI."
#endif
#include "schannel.h"
#include "schannel_int.h"
#include "vtls.h"
#include "vtls_int.h"
#include "strcase.h"
#include "sendf.h"
#include "connect.h" /* for the connect timeout */
#include "strerror.h"
#include "select.h" /* for the socket readiness */
#include "inet_pton.h" /* for IP addr SNI check */
#include "curl_multibyte.h"
#include "warnless.h"
#include "x509asn1.h"
#include "curl_printf.h"
#include "multiif.h"
#include "version_win32.h"
#include "rand.h"
/* The last #include file should be: */
#include "curl_memory.h"
#include "memdebug.h"
/* ALPN requires version 8.1 of the Windows SDK, which was
shipped with Visual Studio 2013, aka _MSC_VER 1800:
https://technet.microsoft.com/en-us/library/hh831771%28v=ws.11%29.aspx
*/
#if defined(_MSC_VER) && (_MSC_VER >= 1800) && !defined(_USING_V110_SDK71_)
# define HAS_ALPN 1
#endif
#ifndef UNISP_NAME_A
#define UNISP_NAME_A "Microsoft Unified Security Protocol Provider"
#endif
#ifndef UNISP_NAME_W
#define UNISP_NAME_W L"Microsoft Unified Security Protocol Provider"
#endif
#ifndef UNISP_NAME
#ifdef UNICODE
#define UNISP_NAME UNISP_NAME_W
#else
#define UNISP_NAME UNISP_NAME_A
#endif
#endif
#ifndef BCRYPT_CHACHA20_POLY1305_ALGORITHM
#define BCRYPT_CHACHA20_POLY1305_ALGORITHM L"CHACHA20_POLY1305"
#endif
#ifndef BCRYPT_CHAIN_MODE_CCM
#define BCRYPT_CHAIN_MODE_CCM L"ChainingModeCCM"
#endif
#ifndef BCRYPT_CHAIN_MODE_GCM
#define BCRYPT_CHAIN_MODE_GCM L"ChainingModeGCM"
#endif
#ifndef BCRYPT_AES_ALGORITHM
#define BCRYPT_AES_ALGORITHM L"AES"
#endif
#ifndef BCRYPT_SHA256_ALGORITHM
#define BCRYPT_SHA256_ALGORITHM L"SHA256"
#endif
#ifndef BCRYPT_SHA384_ALGORITHM
#define BCRYPT_SHA384_ALGORITHM L"SHA384"
#endif
/* Workaround broken compilers like MinGW.
Return the number of elements in a statically sized array.
*/
#ifndef ARRAYSIZE
#define ARRAYSIZE(A) (sizeof(A)/sizeof((A)[0]))
#endif
#ifdef HAS_CLIENT_CERT_PATH
#ifdef UNICODE
#define CURL_CERT_STORE_PROV_SYSTEM CERT_STORE_PROV_SYSTEM_W
#else
#define CURL_CERT_STORE_PROV_SYSTEM CERT_STORE_PROV_SYSTEM_A
#endif
#endif
#ifndef SP_PROT_SSL2_CLIENT
#define SP_PROT_SSL2_CLIENT 0x00000008
#endif
#ifndef SP_PROT_SSL3_CLIENT
#define SP_PROT_SSL3_CLIENT 0x00000008
#endif
#ifndef SP_PROT_TLS1_CLIENT
#define SP_PROT_TLS1_CLIENT 0x00000080
#endif
#ifndef SP_PROT_TLS1_0_CLIENT
#define SP_PROT_TLS1_0_CLIENT SP_PROT_TLS1_CLIENT
#endif
#ifndef SP_PROT_TLS1_1_CLIENT
#define SP_PROT_TLS1_1_CLIENT 0x00000200
#endif
#ifndef SP_PROT_TLS1_2_CLIENT
#define SP_PROT_TLS1_2_CLIENT 0x00000800
#endif
#ifndef SP_PROT_TLS1_3_CLIENT
#define SP_PROT_TLS1_3_CLIENT 0x00002000
#endif
#ifndef SCH_USE_STRONG_CRYPTO
#define SCH_USE_STRONG_CRYPTO 0x00400000
#endif
#ifndef SECBUFFER_ALERT
#define SECBUFFER_ALERT 17
#endif
/* Both schannel buffer sizes must be > 0 */
#define CURL_SCHANNEL_BUFFER_INIT_SIZE 4096
#define CURL_SCHANNEL_BUFFER_FREE_SIZE 1024
#define CERT_THUMBPRINT_STR_LEN 40
#define CERT_THUMBPRINT_DATA_LEN 20
/* Uncomment to force verbose output
* #define infof(x, y, ...) printf(y, __VA_ARGS__)
* #define failf(x, y, ...) printf(y, __VA_ARGS__)
*/
#ifndef CALG_SHA_256
# define CALG_SHA_256 0x0000800c
#endif
/* Work around typo in classic MinGW's w32api up to version 5.0,
see https://osdn.net/projects/mingw/ticket/38391 */
#if !defined(ALG_CLASS_DHASH) && defined(ALG_CLASS_HASH)
#define ALG_CLASS_DHASH ALG_CLASS_HASH
#endif
#ifndef PKCS12_NO_PERSIST_KEY
#define PKCS12_NO_PERSIST_KEY 0x00008000
#endif
static CURLcode schannel_pkp_pin_peer_pubkey(struct Curl_cfilter *cf,
struct Curl_easy *data,
const char *pinnedpubkey);
static void InitSecBuffer(SecBuffer *buffer, unsigned long BufType,
void *BufDataPtr, unsigned long BufByteSize)
{
buffer->cbBuffer = BufByteSize;
buffer->BufferType = BufType;
buffer->pvBuffer = BufDataPtr;
}
static void InitSecBufferDesc(SecBufferDesc *desc, SecBuffer *BufArr,
unsigned long NumArrElem)
{
desc->ulVersion = SECBUFFER_VERSION;
desc->pBuffers = BufArr;
desc->cBuffers = NumArrElem;
}
static CURLcode
schannel_set_ssl_version_min_max(DWORD *enabled_protocols,
struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
long ssl_version = conn_config->version;
long ssl_version_max = conn_config->version_max;
long i = ssl_version;
switch(ssl_version_max) {
case CURL_SSLVERSION_MAX_NONE:
case CURL_SSLVERSION_MAX_DEFAULT:
/* Windows Server 2022 and newer (including Windows 11) support TLS 1.3
built-in. Previous builds of Windows 10 had broken TLS 1.3
implementations that could be enabled via registry.
*/
if(curlx_verify_windows_version(10, 0, 20348, PLATFORM_WINNT,
VERSION_GREATER_THAN_EQUAL)) {
ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_3;
}
else /* Windows 10 and older */
ssl_version_max = CURL_SSLVERSION_MAX_TLSv1_2;
break;
}
for(; i <= (ssl_version_max >> 16); ++i) {
switch(i) {
case CURL_SSLVERSION_TLSv1_0:
(*enabled_protocols) |= SP_PROT_TLS1_0_CLIENT;
break;
case CURL_SSLVERSION_TLSv1_1:
(*enabled_protocols) |= SP_PROT_TLS1_1_CLIENT;
break;
case CURL_SSLVERSION_TLSv1_2:
(*enabled_protocols) |= SP_PROT_TLS1_2_CLIENT;
break;
case CURL_SSLVERSION_TLSv1_3:
/* Windows Server 2022 and newer */
if(curlx_verify_windows_version(10, 0, 20348, PLATFORM_WINNT,
VERSION_GREATER_THAN_EQUAL)) {
(*enabled_protocols) |= SP_PROT_TLS1_3_CLIENT;
break;
}
else { /* Windows 10 and older */
failf(data, "schannel: TLS 1.3 not supported on Windows prior to 11");
return CURLE_SSL_CONNECT_ERROR;
}
}
}
return CURLE_OK;
}
/* longest is 26, buffer is slightly bigger */
#define LONGEST_ALG_ID 32
#define CIPHEROPTION(x) {#x, x}
struct algo {
const char *name;
int id;
};
static const struct algo algs[]= {
CIPHEROPTION(CALG_MD2),
CIPHEROPTION(CALG_MD4),
CIPHEROPTION(CALG_MD5),
CIPHEROPTION(CALG_SHA),
CIPHEROPTION(CALG_SHA1),
CIPHEROPTION(CALG_MAC),
CIPHEROPTION(CALG_RSA_SIGN),
CIPHEROPTION(CALG_DSS_SIGN),
/* ifdefs for the options that are defined conditionally in wincrypt.h */
#ifdef CALG_NO_SIGN
CIPHEROPTION(CALG_NO_SIGN),
#endif
CIPHEROPTION(CALG_RSA_KEYX),
CIPHEROPTION(CALG_DES),
#ifdef CALG_3DES_112
CIPHEROPTION(CALG_3DES_112),
#endif
CIPHEROPTION(CALG_3DES),
CIPHEROPTION(CALG_DESX),
CIPHEROPTION(CALG_RC2),
CIPHEROPTION(CALG_RC4),
CIPHEROPTION(CALG_SEAL),
#ifdef CALG_DH_SF
CIPHEROPTION(CALG_DH_SF),
#endif
CIPHEROPTION(CALG_DH_EPHEM),
#ifdef CALG_AGREEDKEY_ANY
CIPHEROPTION(CALG_AGREEDKEY_ANY),
#endif
#ifdef CALG_HUGHES_MD5
CIPHEROPTION(CALG_HUGHES_MD5),
#endif
CIPHEROPTION(CALG_SKIPJACK),
#ifdef CALG_TEK
CIPHEROPTION(CALG_TEK),
#endif
CIPHEROPTION(CALG_CYLINK_MEK),
CIPHEROPTION(CALG_SSL3_SHAMD5),
#ifdef CALG_SSL3_MASTER
CIPHEROPTION(CALG_SSL3_MASTER),
#endif
#ifdef CALG_SCHANNEL_MASTER_HASH
CIPHEROPTION(CALG_SCHANNEL_MASTER_HASH),
#endif
#ifdef CALG_SCHANNEL_MAC_KEY
CIPHEROPTION(CALG_SCHANNEL_MAC_KEY),
#endif
#ifdef CALG_SCHANNEL_ENC_KEY
CIPHEROPTION(CALG_SCHANNEL_ENC_KEY),
#endif
#ifdef CALG_PCT1_MASTER
CIPHEROPTION(CALG_PCT1_MASTER),
#endif
#ifdef CALG_SSL2_MASTER
CIPHEROPTION(CALG_SSL2_MASTER),
#endif
#ifdef CALG_TLS1_MASTER
CIPHEROPTION(CALG_TLS1_MASTER),
#endif
#ifdef CALG_RC5
CIPHEROPTION(CALG_RC5),
#endif
#ifdef CALG_HMAC
CIPHEROPTION(CALG_HMAC),
#endif
#ifdef CALG_TLS1PRF
CIPHEROPTION(CALG_TLS1PRF),
#endif
#ifdef CALG_HASH_REPLACE_OWF
CIPHEROPTION(CALG_HASH_REPLACE_OWF),
#endif
#ifdef CALG_AES_128
CIPHEROPTION(CALG_AES_128),
#endif
#ifdef CALG_AES_192
CIPHEROPTION(CALG_AES_192),
#endif
#ifdef CALG_AES_256
CIPHEROPTION(CALG_AES_256),
#endif
#ifdef CALG_AES
CIPHEROPTION(CALG_AES),
#endif
#ifdef CALG_SHA_256
CIPHEROPTION(CALG_SHA_256),
#endif
#ifdef CALG_SHA_384
CIPHEROPTION(CALG_SHA_384),
#endif
#ifdef CALG_SHA_512
CIPHEROPTION(CALG_SHA_512),
#endif
#ifdef CALG_ECDH
CIPHEROPTION(CALG_ECDH),
#endif
#ifdef CALG_ECMQV
CIPHEROPTION(CALG_ECMQV),
#endif
#ifdef CALG_ECDSA
CIPHEROPTION(CALG_ECDSA),
#endif
#ifdef CALG_ECDH_EPHEM
CIPHEROPTION(CALG_ECDH_EPHEM),
#endif
{NULL, 0},
};
static int
get_alg_id_by_name(char *name)
{
char *nameEnd = strchr(name, ':');
size_t n = nameEnd ? (size_t)(nameEnd - name) : strlen(name);
int i;
for(i = 0; algs[i].name; i++) {
if((n == strlen(algs[i].name) && !strncmp(algs[i].name, name, n)))
return algs[i].id;
}
return 0; /* not found */
}
#define NUM_CIPHERS 47 /* There are 47 options listed above */
static CURLcode
set_ssl_ciphers(SCHANNEL_CRED *schannel_cred, char *ciphers,
ALG_ID *algIds)
{
char *startCur = ciphers;
int algCount = 0;
while(startCur && (0 != *startCur) && (algCount < NUM_CIPHERS)) {
long alg = strtol(startCur, 0, 0);
if(!alg)
alg = get_alg_id_by_name(startCur);
if(alg)
algIds[algCount++] = alg;
else if(!strncmp(startCur, "USE_STRONG_CRYPTO",
sizeof("USE_STRONG_CRYPTO") - 1) ||
!strncmp(startCur, "SCH_USE_STRONG_CRYPTO",
sizeof("SCH_USE_STRONG_CRYPTO") - 1))
schannel_cred->dwFlags |= SCH_USE_STRONG_CRYPTO;
else
return CURLE_SSL_CIPHER;
startCur = strchr(startCur, ':');
if(startCur)
startCur++;
}
schannel_cred->palgSupportedAlgs = algIds;
schannel_cred->cSupportedAlgs = algCount;
return CURLE_OK;
}
#ifdef HAS_CLIENT_CERT_PATH
/* Function allocates memory for store_path only if CURLE_OK is returned */
static CURLcode
get_cert_location(TCHAR *path, DWORD *store_name, TCHAR **store_path,
TCHAR **thumbprint)
{
TCHAR *sep;
TCHAR *store_path_start;
size_t store_name_len;
sep = _tcschr(path, TEXT('\\'));
if(!sep)
return CURLE_SSL_CERTPROBLEM;
store_name_len = sep - path;
if(_tcsncmp(path, TEXT("CurrentUser"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_CURRENT_USER;
else if(_tcsncmp(path, TEXT("LocalMachine"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE;
else if(_tcsncmp(path, TEXT("CurrentService"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_CURRENT_SERVICE;
else if(_tcsncmp(path, TEXT("Services"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_SERVICES;
else if(_tcsncmp(path, TEXT("Users"), store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_USERS;
else if(_tcsncmp(path, TEXT("CurrentUserGroupPolicy"),
store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_CURRENT_USER_GROUP_POLICY;
else if(_tcsncmp(path, TEXT("LocalMachineGroupPolicy"),
store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE_GROUP_POLICY;
else if(_tcsncmp(path, TEXT("LocalMachineEnterprise"),
store_name_len) == 0)
*store_name = CERT_SYSTEM_STORE_LOCAL_MACHINE_ENTERPRISE;
else
return CURLE_SSL_CERTPROBLEM;
store_path_start = sep + 1;
sep = _tcschr(store_path_start, TEXT('\\'));
if(!sep)
return CURLE_SSL_CERTPROBLEM;
*thumbprint = sep + 1;
if(_tcslen(*thumbprint) != CERT_THUMBPRINT_STR_LEN)
return CURLE_SSL_CERTPROBLEM;
*sep = TEXT('\0');
*store_path = _tcsdup(store_path_start);
*sep = TEXT('\\');
if(!*store_path)
return CURLE_OUT_OF_MEMORY;
return CURLE_OK;
}
#endif
static CURLcode
schannel_acquire_credential_handle(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct ssl_connect_data *connssl = cf->ctx;
struct ssl_primary_config *conn_config = Curl_ssl_cf_get_primary_config(cf);
struct ssl_config_data *ssl_config = Curl_ssl_cf_get_config(cf, data);
#ifdef HAS_CLIENT_CERT_PATH
PCCERT_CONTEXT client_certs[1] = { NULL };
HCERTSTORE client_cert_store = NULL;
#endif
SECURITY_STATUS sspi_status = SEC_E_OK;
CURLcode result;
/* setup Schannel API options */
DWORD flags = 0;
DWORD enabled_protocols = 0;
struct schannel_ssl_backend_data *backend =
(struct schannel_ssl_backend_data *)(connssl->backend);
DEBUGASSERT(backend);
if(conn_config->verifypeer) {
#ifdef HAS_MANUAL_VERIFY_API
if(backend->use_manual_cred_validation)
flags = SCH_CRED_MANUAL_CRED_VALIDATION;
else
#endif
flags = SCH_CRED_AUTO_CRED_VALIDATION;
if(ssl_config->no_revoke) {
flags |= SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
SCH_CRED_IGNORE_REVOCATION_OFFLINE;
DEBUGF(infof(data, "schannel: disabled server certificate revocation "
"checks"));
}
else if(ssl_config->revoke_best_effort) {
flags |= SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
SCH_CRED_IGNORE_REVOCATION_OFFLINE | SCH_CRED_REVOCATION_CHECK_CHAIN;
DEBUGF(infof(data, "schannel: ignore revocation offline errors"));
}
else {
flags |= SCH_CRED_REVOCATION_CHECK_CHAIN;
DEBUGF(infof(data,
"schannel: checking server certificate revocation"));
}
}
else {
flags = SCH_CRED_MANUAL_CRED_VALIDATION |
SCH_CRED_IGNORE_NO_REVOCATION_CHECK |
SCH_CRED_IGNORE_REVOCATION_OFFLINE;
DEBUGF(infof(data,
"schannel: disabled server cert revocation checks"));
}
if(!conn_config->verifyhost) {
flags |= SCH_CRED_NO_SERVERNAME_CHECK;
DEBUGF(infof(data, "schannel: verifyhost setting prevents Schannel from "
"comparing the supplied target name with the subject "
"names in server certificates."));
}
if(!ssl_config->auto_client_cert) {
flags &= ~SCH_CRED_USE_DEFAULT_CREDS;
flags |= SCH_CRED_NO_DEFAULT_CREDS;
infof(data, "schannel: disabled automatic use of client certificate");
}
else
infof(data, "schannel: enabled automatic use of client certificate");
switch(conn_config->version) {
case CURL_SSLVERSION_DEFAULT:
case CURL_SSLVERSION_TLSv1:
case CURL_SSLVERSION_TLSv1_0:
case CURL_SSLVERSION_TLSv1_1:
case CURL_SSLVERSION_TLSv1_2:
case CURL_SSLVERSION_TLSv1_3:
{
result = schannel_set_ssl_version_min_max(&enabled_protocols, cf, data);
if(result != CURLE_OK)
return result;
break;
}
case CURL_SSLVERSION_SSLv3:
case CURL_SSLVERSION_SSLv2:
failf(data, "SSL versions not supported");
return CURLE_NOT_BUILT_IN;
default:
failf(data, "Unrecognized parameter passed via CURLOPT_SSLVERSION");
return CURLE_SSL_CONNECT_ERROR;
}
#ifdef HAS_CLIENT_CERT_PATH
/* client certificate */
if(data->set.ssl.primary.clientcert || data->set.ssl.primary.cert_blob) {
DWORD cert_store_name = 0;
TCHAR *cert_store_path = NULL;
TCHAR *cert_thumbprint_str = NULL;
CRYPT_HASH_BLOB cert_thumbprint;
BYTE cert_thumbprint_data[CERT_THUMBPRINT_DATA_LEN];
HCERTSTORE cert_store = NULL;
FILE *fInCert = NULL;
void *certdata = NULL;
size_t certsize = 0;
bool blob = data->set.ssl.primary.cert_blob != NULL;
TCHAR *cert_path = NULL;
if(blob) {
certdata = data->set.ssl.primary.cert_blob->data;
certsize = data->set.ssl.primary.cert_blob->len;
}
else {
cert_path = curlx_convert_UTF8_to_tchar(
data->set.ssl.primary.clientcert);
if(!cert_path)
return CURLE_OUT_OF_MEMORY;
result = get_cert_location(cert_path, &cert_store_name,
&cert_store_path, &cert_thumbprint_str);
if(result && (data->set.ssl.primary.clientcert[0]!='\0'))
fInCert = fopen(data->set.ssl.primary.clientcert, "rb");
if(result && !fInCert) {
failf(data, "schannel: Failed to get certificate location"
" or file for %s",
data->set.ssl.primary.clientcert);
curlx_unicodefree(cert_path);
return result;
}
}
if((fInCert || blob) && (data->set.ssl.cert_type) &&
(!strcasecompare(data->set.ssl.cert_type, "P12"))) {
failf(data, "schannel: certificate format compatibility error "
" for %s",
blob ? "(memory blob)" : data->set.ssl.primary.clientcert);
curlx_unicodefree(cert_path);
return CURLE_SSL_CERTPROBLEM;
}
if(fInCert || blob) {
/* Reading a .P12 or .pfx file, like the example at bottom of
https://social.msdn.microsoft.com/Forums/windowsdesktop/
en-US/3e7bc95f-b21a-4bcd-bd2c-7f996718cae5
*/
CRYPT_DATA_BLOB datablob;
WCHAR* pszPassword;
size_t pwd_len = 0;
int str_w_len = 0;
const char *cert_showfilename_error = blob ?
"(memory blob)" : data->set.ssl.primary.clientcert;
curlx_unicodefree(cert_path);
if(fInCert) {
long cert_tell = 0;
bool continue_reading = fseek(fInCert, 0, SEEK_END) == 0;
if(continue_reading)
cert_tell = ftell(fInCert);
if(cert_tell < 0)
continue_reading = FALSE;
else
certsize = (size_t)cert_tell;
if(continue_reading)
continue_reading = fseek(fInCert, 0, SEEK_SET) == 0;
if(continue_reading)
certdata = malloc(certsize + 1);
if((!certdata) ||
((int) fread(certdata, certsize, 1, fInCert) != 1))
continue_reading = FALSE;
fclose(fInCert);
if(!continue_reading) {
failf(data, "schannel: Failed to read cert file %s",
data->set.ssl.primary.clientcert);
free(certdata);
return CURLE_SSL_CERTPROBLEM;
}
}
/* Convert key-pair data to the in-memory certificate store */
datablob.pbData = (BYTE*)certdata;
datablob.cbData = (DWORD)certsize;
if(data->set.ssl.key_passwd)
pwd_len = strlen(data->set.ssl.key_passwd);
pszPassword = (WCHAR*)malloc(sizeof(WCHAR)*(pwd_len + 1));
if(pszPassword) {
if(pwd_len > 0)
str_w_len = MultiByteToWideChar(CP_UTF8,
MB_ERR_INVALID_CHARS,
data->set.ssl.key_passwd,
(int)pwd_len,
pszPassword, (int)(pwd_len + 1));
if((str_w_len >= 0) && (str_w_len <= (int)pwd_len))
pszPassword[str_w_len] = 0;
else
pszPassword[0] = 0;
if(curlx_verify_windows_version(6, 0, 0, PLATFORM_WINNT,
VERSION_GREATER_THAN_EQUAL))
cert_store = PFXImportCertStore(&datablob, pszPassword,
PKCS12_NO_PERSIST_KEY);
else
cert_store = PFXImportCertStore(&datablob, pszPassword, 0);
free(pszPassword);
}
if(!blob)
free(certdata);
if(!cert_store) {
DWORD errorcode = GetLastError();
if(errorcode == ERROR_INVALID_PASSWORD)
failf(data, "schannel: Failed to import cert file %s, "
"password is bad",
cert_showfilename_error);
else
failf(data, "schannel: Failed to import cert file %s, "
"last error is 0x%x",
cert_showfilename_error, errorcode);
return CURLE_SSL_CERTPROBLEM;
}
client_certs[0] = CertFindCertificateInStore(
cert_store, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0,
CERT_FIND_ANY, NULL, NULL);
if(!client_certs[0]) {
failf(data, "schannel: Failed to get certificate from file %s"
", last error is 0x%x",
cert_showfilename_error, GetLastError());
CertCloseStore(cert_store, 0);
return CURLE_SSL_CERTPROBLEM;
}
}
else {
cert_store =
CertOpenStore(CURL_CERT_STORE_PROV_SYSTEM, 0,
(HCRYPTPROV)NULL,
CERT_STORE_OPEN_EXISTING_FLAG | cert_store_name,
cert_store_path);
if(!cert_store) {
failf(data, "schannel: Failed to open cert store %x %s, "
"last error is 0x%x",
cert_store_name, cert_store_path, GetLastError());
free(cert_store_path);
curlx_unicodefree(cert_path);
return CURLE_SSL_CERTPROBLEM;
}
free(cert_store_path);
cert_thumbprint.pbData = cert_thumbprint_data;
cert_thumbprint.cbData = CERT_THUMBPRINT_DATA_LEN;
if(!CryptStringToBinary(cert_thumbprint_str,
CERT_THUMBPRINT_STR_LEN,
CRYPT_STRING_HEX,
cert_thumbprint_data,
&cert_thumbprint.cbData,
NULL, NULL)) {
curlx_unicodefree(cert_path);
CertCloseStore(cert_store, 0);
return CURLE_SSL_CERTPROBLEM;
}
client_certs[0] = CertFindCertificateInStore(
cert_store, X509_ASN_ENCODING | PKCS_7_ASN_ENCODING, 0,
CERT_FIND_HASH, &cert_thumbprint, NULL);
curlx_unicodefree(cert_path);
if(!client_certs[0]) {
/* CRYPT_E_NOT_FOUND / E_INVALIDARG */
CertCloseStore(cert_store, 0);
return CURLE_SSL_CERTPROBLEM;
}
}
client_cert_store = cert_store;
}
#else
if(data->set.ssl.primary.clientcert || data->set.ssl.primary.cert_blob) {
failf(data, "schannel: client cert support not built in");
return CURLE_NOT_BUILT_IN;
}
#endif
/* allocate memory for the re-usable credential handle */
backend->cred = (struct Curl_schannel_cred *)
calloc(1, sizeof(struct Curl_schannel_cred));
if(!backend->cred) {
failf(data, "schannel: unable to allocate memory");
#ifdef HAS_CLIENT_CERT_PATH
if(client_certs[0])
CertFreeCertificateContext(client_certs[0]);
if(client_cert_store)
CertCloseStore(client_cert_store, 0);
#endif
return CURLE_OUT_OF_MEMORY;
}
backend->cred->refcount = 1;
#ifdef HAS_CLIENT_CERT_PATH
/* Since we did not persist the key, we need to extend the store's
* lifetime until the end of the connection
*/
backend->cred->client_cert_store = client_cert_store;
#endif
/* We support TLS 1.3 starting in Windows 10 version 1809 (OS build 17763) as
long as the user did not set a legacy algorithm list
(CURLOPT_SSL_CIPHER_LIST). */
if(!conn_config->cipher_list &&
curlx_verify_windows_version(10, 0, 17763, PLATFORM_WINNT,
VERSION_GREATER_THAN_EQUAL)) {
char *ciphers13 = 0;
bool disable_aes_gcm_sha384 = FALSE;
bool disable_aes_gcm_sha256 = FALSE;
bool disable_chacha_poly = FALSE;
bool disable_aes_ccm_8_sha256 = FALSE;
bool disable_aes_ccm_sha256 = FALSE;
SCH_CREDENTIALS credentials = { 0 };
TLS_PARAMETERS tls_parameters = { 0 };
CRYPTO_SETTINGS crypto_settings[4] = { 0 };
UNICODE_STRING blocked_ccm_modes[1] = { 0 };
UNICODE_STRING blocked_gcm_modes[1] = { 0 };
int crypto_settings_idx = 0;
/* If TLS 1.3 ciphers are explicitly listed, then
* disable all the ciphers and re-enable which
* ciphers the user has provided.
*/
ciphers13 = conn_config->cipher_list13;
if(ciphers13) {
const int remaining_ciphers = 5;
/* detect which remaining ciphers to enable
and then disable everything else.
*/
char *startCur = ciphers13;
int algCount = 0;
char tmp[LONGEST_ALG_ID] = { 0 };
char *nameEnd;
size_t n;
disable_aes_gcm_sha384 = TRUE;
disable_aes_gcm_sha256 = TRUE;
disable_chacha_poly = TRUE;
disable_aes_ccm_8_sha256 = TRUE;
disable_aes_ccm_sha256 = TRUE;
while(startCur && (0 != *startCur) && (algCount < remaining_ciphers)) {
nameEnd = strchr(startCur, ':');
n = nameEnd ? (size_t)(nameEnd - startCur) : strlen(startCur);
/* reject too-long cipher names */
if(n > (LONGEST_ALG_ID - 1)) {
failf(data, "schannel: Cipher name too long, not checked");
return CURLE_SSL_CIPHER;
}
strncpy(tmp, startCur, n);
tmp[n] = 0;
if(disable_aes_gcm_sha384
&& !strcmp("TLS_AES_256_GCM_SHA384", tmp)) {
disable_aes_gcm_sha384 = FALSE;
}
else if(disable_aes_gcm_sha256
&& !strcmp("TLS_AES_128_GCM_SHA256", tmp)) {
disable_aes_gcm_sha256 = FALSE;
}
else if(disable_chacha_poly
&& !strcmp("TLS_CHACHA20_POLY1305_SHA256", tmp)) {
disable_chacha_poly = FALSE;
}
else if(disable_aes_ccm_8_sha256
&& !strcmp("TLS_AES_128_CCM_8_SHA256", tmp)) {
disable_aes_ccm_8_sha256 = FALSE;
}
else if(disable_aes_ccm_sha256
&& !strcmp("TLS_AES_128_CCM_SHA256", tmp)) {
disable_aes_ccm_sha256 = FALSE;
}
else {
failf(data, "schannel: Unknown TLS 1.3 cipher: %s", tmp);
return CURLE_SSL_CIPHER;
}
startCur = nameEnd;
if(startCur)
startCur++;
algCount++;
}
}
if(disable_aes_gcm_sha384 && disable_aes_gcm_sha256
&& disable_chacha_poly && disable_aes_ccm_8_sha256
&& disable_aes_ccm_sha256) {
failf(data, "schannel: All available TLS 1.3 ciphers were disabled");
return CURLE_SSL_CIPHER;
}
/* Disable TLS_AES_128_CCM_8_SHA256 and/or TLS_AES_128_CCM_SHA256 */
if(disable_aes_ccm_8_sha256 || disable_aes_ccm_sha256) {
/*
Disallow AES_CCM algorithm.
*/
blocked_ccm_modes[0].Length = sizeof(BCRYPT_CHAIN_MODE_CCM);
blocked_ccm_modes[0].MaximumLength = sizeof(BCRYPT_CHAIN_MODE_CCM);
blocked_ccm_modes[0].Buffer = (PWSTR)BCRYPT_CHAIN_MODE_CCM;
crypto_settings[crypto_settings_idx].eAlgorithmUsage =
TlsParametersCngAlgUsageCipher;
crypto_settings[crypto_settings_idx].rgstrChainingModes =
blocked_ccm_modes;
crypto_settings[crypto_settings_idx].cChainingModes =
ARRAYSIZE(blocked_ccm_modes);
crypto_settings[crypto_settings_idx].strCngAlgId.Length =
sizeof(BCRYPT_AES_ALGORITHM);
crypto_settings[crypto_settings_idx].strCngAlgId.MaximumLength =
sizeof(BCRYPT_AES_ALGORITHM);
crypto_settings[crypto_settings_idx].strCngAlgId.Buffer =
(PWSTR)BCRYPT_AES_ALGORITHM;
/* only disabling one of the CCM modes */
if(disable_aes_ccm_8_sha256 != disable_aes_ccm_sha256) {
if(disable_aes_ccm_8_sha256)
crypto_settings[crypto_settings_idx].dwMinBitLength = 128;
else /* disable_aes_ccm_sha256 */
crypto_settings[crypto_settings_idx].dwMaxBitLength = 64;
}
crypto_settings_idx++;
}
/* Disable TLS_AES_256_GCM_SHA384 and/or TLS_AES_128_GCM_SHA256 */
if(disable_aes_gcm_sha384 || disable_aes_gcm_sha256) {
/*
Disallow AES_GCM algorithm
*/
blocked_gcm_modes[0].Length = sizeof(BCRYPT_CHAIN_MODE_GCM);
blocked_gcm_modes[0].MaximumLength = sizeof(BCRYPT_CHAIN_MODE_GCM);
blocked_gcm_modes[0].Buffer = (PWSTR)BCRYPT_CHAIN_MODE_GCM;
/* if only one is disabled, then explicitly disable the
digest cipher suite (sha384 or sha256) */
if(disable_aes_gcm_sha384 != disable_aes_gcm_sha256) {
crypto_settings[crypto_settings_idx].eAlgorithmUsage =
TlsParametersCngAlgUsageDigest;
crypto_settings[crypto_settings_idx].strCngAlgId.Length =
sizeof(disable_aes_gcm_sha384 ?
BCRYPT_SHA384_ALGORITHM : BCRYPT_SHA256_ALGORITHM);
crypto_settings[crypto_settings_idx].strCngAlgId.MaximumLength =
sizeof(disable_aes_gcm_sha384 ?
BCRYPT_SHA384_ALGORITHM : BCRYPT_SHA256_ALGORITHM);
crypto_settings[crypto_settings_idx].strCngAlgId.Buffer =
(PWSTR)(disable_aes_gcm_sha384 ?
BCRYPT_SHA384_ALGORITHM : BCRYPT_SHA256_ALGORITHM);
}
else { /* Disable both AES_GCM ciphers */
crypto_settings[crypto_settings_idx].eAlgorithmUsage =
TlsParametersCngAlgUsageCipher;
crypto_settings[crypto_settings_idx].strCngAlgId.Length =
sizeof(BCRYPT_AES_ALGORITHM);
crypto_settings[crypto_settings_idx].strCngAlgId.MaximumLength =
sizeof(BCRYPT_AES_ALGORITHM);
crypto_settings[crypto_settings_idx].strCngAlgId.Buffer =
(PWSTR)BCRYPT_AES_ALGORITHM;
}
crypto_settings[crypto_settings_idx].rgstrChainingModes =
blocked_gcm_modes;
crypto_settings[crypto_settings_idx].cChainingModes = 1;
crypto_settings_idx++;
}
/*
Disable ChaCha20-Poly1305.
*/
if(disable_chacha_poly) {
crypto_settings[crypto_settings_idx].eAlgorithmUsage =
TlsParametersCngAlgUsageCipher;
crypto_settings[crypto_settings_idx].strCngAlgId.Length =
sizeof(BCRYPT_CHACHA20_POLY1305_ALGORITHM);
crypto_settings[crypto_settings_idx].strCngAlgId.MaximumLength =
sizeof(BCRYPT_CHACHA20_POLY1305_ALGORITHM);
crypto_settings[crypto_settings_idx].strCngAlgId.Buffer =
(PWSTR)BCRYPT_CHACHA20_POLY1305_ALGORITHM;
crypto_settings_idx++;
}
tls_parameters.pDisabledCrypto = crypto_settings;
/* The number of blocked suites */
tls_parameters.cDisabledCrypto = crypto_settings_idx;
credentials.pTlsParameters = &tls_parameters;
credentials.cTlsParameters = 1;
credentials.dwVersion = SCH_CREDENTIALS_VERSION;
credentials.dwFlags = flags | SCH_USE_STRONG_CRYPTO;
credentials.pTlsParameters->grbitDisabledProtocols =
(DWORD)~enabled_protocols;