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
|
#ifndef NO_GSSAPI
#include <limits.h>
#include "putty.h"
#define SECURITY_WIN32
#include <security.h>
#include "ssh/pgssapi.h"
#include "ssh/gss.h"
#include "ssh/gssc.h"
#include "misc.h"
#define UNIX_EPOCH 11644473600ULL /* Seconds from Windows epoch */
#define CNS_PERSEC 10000000ULL /* # 100ns per second */
/*
* Note, as a special case, 0 relative to the Windows epoch (unspecified) maps
* to 0 relative to the POSIX epoch (unspecified)!
*/
#define TIME_WIN_TO_POSIX(ft, t) do { \
ULARGE_INTEGER uli; \
uli.LowPart = (ft).dwLowDateTime; \
uli.HighPart = (ft).dwHighDateTime; \
if (uli.QuadPart != 0) \
uli.QuadPart = uli.QuadPart / CNS_PERSEC - UNIX_EPOCH; \
(t) = (time_t) uli.QuadPart; \
} while(0)
/* Windows code to set up the GSSAPI library list. */
#ifdef _WIN64
#define MIT_KERB_SUFFIX "64"
#else
#define MIT_KERB_SUFFIX "32"
#endif
const int ngsslibs = 3;
const char *const gsslibnames[3] = {
"MIT Kerberos GSSAPI"MIT_KERB_SUFFIX".DLL",
"Microsoft SSPI SECUR32.DLL",
"User-specified GSSAPI DLL",
};
const struct keyvalwhere gsslibkeywords[] = {
{ "gssapi32", 0, -1, -1 },
{ "sspi", 1, -1, -1 },
{ "custom", 2, -1, -1 },
};
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
AcquireCredentialsHandleA,
(SEC_CHAR *, SEC_CHAR *, ULONG, PVOID,
PVOID, SEC_GET_KEY_FN, PVOID, PCredHandle, PTimeStamp));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
InitializeSecurityContextA,
(PCredHandle, PCtxtHandle, SEC_CHAR *, ULONG, ULONG,
ULONG, PSecBufferDesc, ULONG, PCtxtHandle,
PSecBufferDesc, PULONG, PTimeStamp));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
FreeContextBuffer,
(PVOID));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
FreeCredentialsHandle,
(PCredHandle));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
DeleteSecurityContext,
(PCtxtHandle));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
QueryContextAttributesA,
(PCtxtHandle, ULONG, PVOID));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
MakeSignature,
(PCtxtHandle, ULONG, PSecBufferDesc, ULONG));
DECL_WINDOWS_FUNCTION(static, SECURITY_STATUS,
VerifySignature,
(PCtxtHandle, PSecBufferDesc, ULONG, PULONG));
DECL_WINDOWS_FUNCTION(static, DLL_DIRECTORY_COOKIE,
AddDllDirectory,
(PCWSTR));
typedef struct winSsh_gss_ctx {
unsigned long maj_stat;
unsigned long min_stat;
CredHandle cred_handle;
CtxtHandle context;
PCtxtHandle context_handle;
TimeStamp expiry;
} winSsh_gss_ctx;
const Ssh_gss_buf gss_mech_krb5={9,"\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"};
const char *gsslogmsg = NULL;
static void ssh_sspi_bind_fns(struct ssh_gss_library *lib);
static tree234 *libraries_to_never_unload;
static int library_to_never_unload_cmp(void *av, void *bv)
{
uintptr_t a = (uintptr_t)av, b = (uintptr_t)bv;
return a < b ? -1 : a > b ? +1 : 0;
}
static void ensure_library_tree_exists(void)
{
if (!libraries_to_never_unload)
libraries_to_never_unload = newtree234(library_to_never_unload_cmp);
}
static bool library_is_in_never_unload_tree(HMODULE module)
{
ensure_library_tree_exists();
return find234(libraries_to_never_unload, module, NULL);
}
static void add_library_to_never_unload_tree(HMODULE module)
{
ensure_library_tree_exists();
add234(libraries_to_never_unload, module);
}
struct ssh_gss_liblist *ssh_gss_setup(Conf *conf)
{
HMODULE module;
HKEY regkey;
struct ssh_gss_liblist *list = snew(struct ssh_gss_liblist);
char *path;
static HMODULE kernel32_module;
if (!kernel32_module) {
kernel32_module = load_system32_dll("kernel32.dll");
}
#if !HAVE_ADDDLLDIRECTORY
/* Omit the type-check because older MSVCs don't have this function */
GET_WINDOWS_FUNCTION_NO_TYPECHECK(kernel32_module, AddDllDirectory);
#else
GET_WINDOWS_FUNCTION(kernel32_module, AddDllDirectory);
#endif
list->libraries = snewn(3, struct ssh_gss_library);
list->nlibraries = 0;
/* MIT Kerberos GSSAPI implementation */
module = NULL;
if (RegOpenKey(HKEY_LOCAL_MACHINE, "SOFTWARE\\MIT\\Kerberos", ®key)
== ERROR_SUCCESS) {
DWORD type, size;
LONG ret;
char *buffer;
/* Find out the string length */
ret = RegQueryValueEx(regkey, "InstallDir", NULL, &type, NULL, &size);
if (ret == ERROR_SUCCESS && type == REG_SZ) {
buffer = snewn(size + 20, char);
ret = RegQueryValueEx(regkey, "InstallDir", NULL,
&type, (LPBYTE)buffer, &size);
if (ret == ERROR_SUCCESS && type == REG_SZ) {
strcat (buffer, "\\bin");
if(p_AddDllDirectory) {
/* Add MIT Kerberos' path to the DLL search path,
* it loads its own DLLs further down the road */
wchar_t *dllPath =
dup_mb_to_wc(DEFAULT_CODEPAGE, 0, buffer);
p_AddDllDirectory(dllPath);
sfree(dllPath);
}
strcat (buffer, "\\gssapi"MIT_KERB_SUFFIX".dll");
module = LoadLibraryEx (buffer, NULL,
LOAD_LIBRARY_SEARCH_SYSTEM32 |
LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR |
LOAD_LIBRARY_SEARCH_USER_DIRS);
/*
* The MIT Kerberos DLL suffers an internal segfault
* for some reason if you unload and reload one within
* the same process. So, make sure that after we load
* this library, we never free it.
*
* Or rather: after we've loaded it once, if any
* _further_ load returns the same module handle, we
* immediately free it again (to prevent the Windows
* API's internal reference count growing without
* bound). But on the other hand we never free it in
* ssh_gss_cleanup.
*/
if (library_is_in_never_unload_tree(module))
FreeLibrary(module);
add_library_to_never_unload_tree(module);
}
sfree(buffer);
}
RegCloseKey(regkey);
}
if (module) {
struct ssh_gss_library *lib =
&list->libraries[list->nlibraries++];
lib->id = 0;
lib->gsslogmsg = "Using GSSAPI from GSSAPI"MIT_KERB_SUFFIX".DLL";
lib->handle = (void *)module;
#define BIND_GSS_FN(name) \
lib->u.gssapi.name = (t_gss_##name) GetProcAddress(module, "gss_" #name)
BIND_GSS_FN(delete_sec_context);
BIND_GSS_FN(display_status);
BIND_GSS_FN(get_mic);
BIND_GSS_FN(verify_mic);
BIND_GSS_FN(import_name);
BIND_GSS_FN(init_sec_context);
BIND_GSS_FN(release_buffer);
BIND_GSS_FN(release_cred);
BIND_GSS_FN(release_name);
BIND_GSS_FN(acquire_cred);
BIND_GSS_FN(inquire_cred_by_mech);
#undef BIND_GSS_FN
ssh_gssapi_bind_fns(lib);
}
/* Microsoft SSPI Implementation */
module = load_system32_dll("secur32.dll");
if (module) {
struct ssh_gss_library *lib =
&list->libraries[list->nlibraries++];
lib->id = 1;
lib->gsslogmsg = "Using SSPI from SECUR32.DLL";
lib->handle = (void *)module;
/* No typecheck because Winelib thinks one PVOID is a PLUID */
GET_WINDOWS_FUNCTION_NO_TYPECHECK(module, AcquireCredentialsHandleA);
GET_WINDOWS_FUNCTION(module, InitializeSecurityContextA);
GET_WINDOWS_FUNCTION(module, FreeContextBuffer);
GET_WINDOWS_FUNCTION(module, FreeCredentialsHandle);
GET_WINDOWS_FUNCTION(module, DeleteSecurityContext);
GET_WINDOWS_FUNCTION(module, QueryContextAttributesA);
GET_WINDOWS_FUNCTION(module, MakeSignature);
GET_WINDOWS_FUNCTION(module, VerifySignature);
ssh_sspi_bind_fns(lib);
}
/*
* Custom GSSAPI DLL.
*/
module = NULL;
path = conf_get_filename(conf, CONF_ssh_gss_custom)->path;
if (*path) {
if(p_AddDllDirectory) {
/* Add the custom directory as well in case it chainloads
* some other DLLs (e.g a non-installed MIT Kerberos
* instance) */
int pathlen = strlen(path);
while (pathlen > 0 && path[pathlen-1] != ':' &&
path[pathlen-1] != '\\')
pathlen--;
if (pathlen > 0 && path[pathlen-1] != '\\')
pathlen--;
if (pathlen > 0) {
char *dirpath = dupprintf("%.*s", pathlen, path);
wchar_t *dllPath = dup_mb_to_wc(DEFAULT_CODEPAGE, 0, dirpath);
p_AddDllDirectory(dllPath);
sfree(dllPath);
sfree(dirpath);
}
}
module = LoadLibraryEx(path, NULL,
LOAD_LIBRARY_SEARCH_SYSTEM32 |
LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR |
LOAD_LIBRARY_SEARCH_USER_DIRS);
}
if (module) {
struct ssh_gss_library *lib =
&list->libraries[list->nlibraries++];
lib->id = 2;
lib->gsslogmsg = dupprintf("Using GSSAPI from user-specified"
" library '%s'", path);
lib->handle = (void *)module;
#define BIND_GSS_FN(name) \
lib->u.gssapi.name = (t_gss_##name) GetProcAddress(module, "gss_" #name)
BIND_GSS_FN(delete_sec_context);
BIND_GSS_FN(display_status);
BIND_GSS_FN(get_mic);
BIND_GSS_FN(verify_mic);
BIND_GSS_FN(import_name);
BIND_GSS_FN(init_sec_context);
BIND_GSS_FN(release_buffer);
BIND_GSS_FN(release_cred);
BIND_GSS_FN(release_name);
BIND_GSS_FN(acquire_cred);
BIND_GSS_FN(inquire_cred_by_mech);
#undef BIND_GSS_FN
ssh_gssapi_bind_fns(lib);
}
return list;
}
void ssh_gss_cleanup(struct ssh_gss_liblist *list)
{
int i;
/*
* LoadLibrary and FreeLibrary are defined to employ reference
* counting in the case where the same library is repeatedly
* loaded, so even in a multiple-sessions-per-process context
* (not that we currently expect ever to have such a thing on
* Windows) it's safe to naively FreeLibrary everything here
* without worrying about destroying it under the feet of
* another SSH instance still using it.
*/
for (i = 0; i < list->nlibraries; i++) {
if (list->libraries[i].id != 0) {
HMODULE module = (HMODULE)list->libraries[i].handle;
if (!library_is_in_never_unload_tree(module))
FreeLibrary(module);
}
if (list->libraries[i].id == 2) {
/* The 'custom' id involves a dynamically allocated message.
* Note that we must cast away the 'const' to free it. */
sfree((char *)list->libraries[i].gsslogmsg);
}
}
sfree(list->libraries);
sfree(list);
}
static Ssh_gss_stat ssh_sspi_indicate_mech(struct ssh_gss_library *lib,
Ssh_gss_buf *mech)
{
*mech = gss_mech_krb5;
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_import_name(struct ssh_gss_library *lib,
char *host, Ssh_gss_name *srv_name)
{
char *pStr;
/* Check hostname */
if (host == NULL) return SSH_GSS_FAILURE;
/* copy it into form host/FQDN */
pStr = dupcat("host/", host);
*srv_name = (Ssh_gss_name) pStr;
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_acquire_cred(struct ssh_gss_library *lib,
Ssh_gss_ctx *ctx,
time_t *expiry)
{
winSsh_gss_ctx *winctx = snew(winSsh_gss_ctx);
memset(winctx, 0, sizeof(winSsh_gss_ctx));
/* prepare our "wrapper" structure */
winctx->maj_stat = winctx->min_stat = SEC_E_OK;
winctx->context_handle = NULL;
/* Specifying no principal name here means use the credentials of
the current logged-in user */
winctx->maj_stat = p_AcquireCredentialsHandleA(NULL,
"Kerberos",
SECPKG_CRED_OUTBOUND,
NULL,
NULL,
NULL,
NULL,
&winctx->cred_handle,
NULL);
if (winctx->maj_stat != SEC_E_OK) {
p_FreeCredentialsHandle(&winctx->cred_handle);
sfree(winctx);
return SSH_GSS_FAILURE;
}
/* Windows does not return a valid expiration from AcquireCredentials */
if (expiry)
*expiry = GSS_NO_EXPIRATION;
*ctx = (Ssh_gss_ctx) winctx;
return SSH_GSS_OK;
}
static void localexp_to_exp_lifetime(TimeStamp *localexp,
time_t *expiry, unsigned long *lifetime)
{
FILETIME nowUTC;
FILETIME expUTC;
time_t now;
time_t exp;
time_t delta;
if (!lifetime && !expiry)
return;
GetSystemTimeAsFileTime(&nowUTC);
TIME_WIN_TO_POSIX(nowUTC, now);
if (lifetime)
*lifetime = 0;
if (expiry)
*expiry = GSS_NO_EXPIRATION;
/*
* Type oddity: localexp is a pointer to 'TimeStamp', whereas
* LocalFileTimeToFileTime expects a pointer to FILETIME. However,
* despite having different formal type names from the compiler's
* point of view, these two structures are specified to be
* isomorphic in the MS documentation, so it's legitimate to copy
* between them:
*
* https://msdn.microsoft.com/en-us/library/windows/desktop/aa380511(v=vs.85).aspx
*/
{
FILETIME localexp_ft;
enum { vorpal_sword = 1 / (sizeof(*localexp) == sizeof(localexp_ft)) };
memcpy(&localexp_ft, localexp, sizeof(localexp_ft));
if (!LocalFileTimeToFileTime(&localexp_ft, &expUTC))
return;
}
TIME_WIN_TO_POSIX(expUTC, exp);
delta = exp - now;
if (exp == 0 || delta <= 0)
return;
if (expiry)
*expiry = exp;
if (lifetime) {
if (delta <= ULONG_MAX)
*lifetime = (unsigned long)delta;
else
*lifetime = ULONG_MAX;
}
}
static Ssh_gss_stat ssh_sspi_init_sec_context(struct ssh_gss_library *lib,
Ssh_gss_ctx *ctx,
Ssh_gss_name srv_name,
int to_deleg,
Ssh_gss_buf *recv_tok,
Ssh_gss_buf *send_tok,
time_t *expiry,
unsigned long *lifetime)
{
winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) *ctx;
SecBuffer wsend_tok = {send_tok->length,SECBUFFER_TOKEN,send_tok->value};
SecBuffer wrecv_tok = {recv_tok->length,SECBUFFER_TOKEN,recv_tok->value};
SecBufferDesc output_desc={SECBUFFER_VERSION,1,&wsend_tok};
SecBufferDesc input_desc ={SECBUFFER_VERSION,1,&wrecv_tok};
unsigned long flags=ISC_REQ_MUTUAL_AUTH|ISC_REQ_REPLAY_DETECT|
ISC_REQ_CONFIDENTIALITY|ISC_REQ_ALLOCATE_MEMORY;
ULONG ret_flags=0;
TimeStamp localexp;
/* check if we have to delegate ... */
if (to_deleg) flags |= ISC_REQ_DELEGATE;
winctx->maj_stat = p_InitializeSecurityContextA(&winctx->cred_handle,
winctx->context_handle,
(char*) srv_name,
flags,
0, /* reserved */
SECURITY_NATIVE_DREP,
&input_desc,
0, /* reserved */
&winctx->context,
&output_desc,
&ret_flags,
&localexp);
localexp_to_exp_lifetime(&localexp, expiry, lifetime);
/* prepare for the next round */
winctx->context_handle = &winctx->context;
send_tok->value = wsend_tok.pvBuffer;
send_tok->length = wsend_tok.cbBuffer;
/* check & return our status */
if (winctx->maj_stat==SEC_E_OK) return SSH_GSS_S_COMPLETE;
if (winctx->maj_stat==SEC_I_CONTINUE_NEEDED) return SSH_GSS_S_CONTINUE_NEEDED;
return SSH_GSS_FAILURE;
}
static Ssh_gss_stat ssh_sspi_free_tok(struct ssh_gss_library *lib,
Ssh_gss_buf *send_tok)
{
/* check input */
if (send_tok == NULL) return SSH_GSS_FAILURE;
/* free Windows buffer */
p_FreeContextBuffer(send_tok->value);
SSH_GSS_CLEAR_BUF(send_tok);
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_release_cred(struct ssh_gss_library *lib,
Ssh_gss_ctx *ctx)
{
winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) *ctx;
/* check input */
if (winctx == NULL) return SSH_GSS_FAILURE;
/* free Windows data */
p_FreeCredentialsHandle(&winctx->cred_handle);
p_DeleteSecurityContext(&winctx->context);
/* delete our "wrapper" structure */
sfree(winctx);
*ctx = (Ssh_gss_ctx) NULL;
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_release_name(struct ssh_gss_library *lib,
Ssh_gss_name *srv_name)
{
char *pStr= (char *) *srv_name;
if (pStr == NULL) return SSH_GSS_FAILURE;
sfree(pStr);
*srv_name = (Ssh_gss_name) NULL;
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_display_status(struct ssh_gss_library *lib,
Ssh_gss_ctx ctx, Ssh_gss_buf *buf)
{
winSsh_gss_ctx *winctx = (winSsh_gss_ctx *) ctx;
const char *msg;
if (winctx == NULL) return SSH_GSS_FAILURE;
/* decode the error code */
switch (winctx->maj_stat) {
case SEC_E_OK: msg="SSPI status OK"; break;
case SEC_E_INVALID_HANDLE: msg="The handle passed to the function"
" is invalid.";
break;
case SEC_E_TARGET_UNKNOWN: msg="The target was not recognized."; break;
case SEC_E_LOGON_DENIED: msg="The logon failed."; break;
case SEC_E_INTERNAL_ERROR: msg="The Local Security Authority cannot"
" be contacted.";
break;
case SEC_E_NO_CREDENTIALS: msg="No credentials are available in the"
" security package.";
break;
case SEC_E_NO_AUTHENTICATING_AUTHORITY:
msg="No authority could be contacted for authentication."
"The domain name of the authenticating party could be wrong,"
" the domain could be unreachable, or there might have been"
" a trust relationship failure.";
break;
case SEC_E_INSUFFICIENT_MEMORY:
msg="One or more of the SecBufferDesc structures passed as"
" an OUT parameter has a buffer that is too small.";
break;
case SEC_E_INVALID_TOKEN:
msg="The error is due to a malformed input token, such as a"
" token corrupted in transit, a token"
" of incorrect size, or a token passed into the wrong"
" security package. Passing a token to"
" the wrong package can happen if client and server did not"
" negotiate the proper security package.";
break;
default:
msg = "Internal SSPI error";
break;
}
buf->value = dupstr(msg);
buf->length = strlen(buf->value);
return SSH_GSS_OK;
}
static Ssh_gss_stat ssh_sspi_get_mic(struct ssh_gss_library *lib,
Ssh_gss_ctx ctx, Ssh_gss_buf *buf,
Ssh_gss_buf *hash)
{
winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) ctx;
SecPkgContext_Sizes ContextSizes;
SecBufferDesc InputBufferDescriptor;
SecBuffer InputSecurityToken[2];
if (winctx == NULL) return SSH_GSS_FAILURE;
winctx->maj_stat = 0;
memset(&ContextSizes, 0, sizeof(ContextSizes));
winctx->maj_stat = p_QueryContextAttributesA(&winctx->context,
SECPKG_ATTR_SIZES,
&ContextSizes);
if (winctx->maj_stat != SEC_E_OK ||
ContextSizes.cbMaxSignature == 0)
return winctx->maj_stat;
InputBufferDescriptor.cBuffers = 2;
InputBufferDescriptor.pBuffers = InputSecurityToken;
InputBufferDescriptor.ulVersion = SECBUFFER_VERSION;
InputSecurityToken[0].BufferType = SECBUFFER_DATA;
InputSecurityToken[0].cbBuffer = buf->length;
InputSecurityToken[0].pvBuffer = buf->value;
InputSecurityToken[1].BufferType = SECBUFFER_TOKEN;
InputSecurityToken[1].cbBuffer = ContextSizes.cbMaxSignature;
InputSecurityToken[1].pvBuffer = snewn(ContextSizes.cbMaxSignature, char);
winctx->maj_stat = p_MakeSignature(&winctx->context,
0,
&InputBufferDescriptor,
0);
if (winctx->maj_stat == SEC_E_OK) {
hash->length = InputSecurityToken[1].cbBuffer;
hash->value = InputSecurityToken[1].pvBuffer;
}
return winctx->maj_stat;
}
static Ssh_gss_stat ssh_sspi_verify_mic(struct ssh_gss_library *lib,
Ssh_gss_ctx ctx,
Ssh_gss_buf *buf,
Ssh_gss_buf *mic)
{
winSsh_gss_ctx *winctx= (winSsh_gss_ctx *) ctx;
SecBufferDesc InputBufferDescriptor;
SecBuffer InputSecurityToken[2];
ULONG qop;
if (winctx == NULL) return SSH_GSS_FAILURE;
winctx->maj_stat = 0;
InputBufferDescriptor.cBuffers = 2;
InputBufferDescriptor.pBuffers = InputSecurityToken;
InputBufferDescriptor.ulVersion = SECBUFFER_VERSION;
InputSecurityToken[0].BufferType = SECBUFFER_DATA;
InputSecurityToken[0].cbBuffer = buf->length;
InputSecurityToken[0].pvBuffer = buf->value;
InputSecurityToken[1].BufferType = SECBUFFER_TOKEN;
InputSecurityToken[1].cbBuffer = mic->length;
InputSecurityToken[1].pvBuffer = mic->value;
winctx->maj_stat = p_VerifySignature(&winctx->context,
&InputBufferDescriptor,
0, &qop);
return winctx->maj_stat;
}
static Ssh_gss_stat ssh_sspi_free_mic(struct ssh_gss_library *lib,
Ssh_gss_buf *hash)
{
sfree(hash->value);
return SSH_GSS_OK;
}
static void ssh_sspi_bind_fns(struct ssh_gss_library *lib)
{
lib->indicate_mech = ssh_sspi_indicate_mech;
lib->import_name = ssh_sspi_import_name;
lib->release_name = ssh_sspi_release_name;
lib->init_sec_context = ssh_sspi_init_sec_context;
lib->free_tok = ssh_sspi_free_tok;
lib->acquire_cred = ssh_sspi_acquire_cred;
lib->release_cred = ssh_sspi_release_cred;
lib->get_mic = ssh_sspi_get_mic;
lib->verify_mic = ssh_sspi_verify_mic;
lib->free_mic = ssh_sspi_free_mic;
lib->display_status = ssh_sspi_display_status;
}
#else
/* Dummy function so this source file defines something if NO_GSSAPI
is defined. */
void ssh_gss_init(void)
{
}
#endif
|