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
|
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices; // DllImport
using System.Security.Principal; // WindowsImpersonationContext
using System.ComponentModel;
namespace Util
{
public class Impersonation : IDisposable
{
#region Dll Imports
/// <summary>
/// Closes an open object handle.
/// </summary>
/// <param name="hObject">A handle to an open object.</param>
/// <returns><c>True</c> when succeeded; otherwise <c>false</c>.</returns>
[DllImport("kernel32.dll")]
private static extern Boolean CloseHandle(IntPtr hObject);
/// <summary>
/// Attempts to log a user on to the local computer.
/// </summary>
/// <param name="username">This is the name of the user account to log on to.
/// If you use the user principal name (UPN) format, user@DNSdomainname, the
/// domain parameter must be <c>null</c>.</param>
/// <param name="domain">Specifies the name of the domain or server whose
/// account database contains the lpszUsername account. If this parameter
/// is <c>null</c>, the user name must be specified in UPN format. If this
/// parameter is ".", the function validates the account by using only the
/// local account database.</param>
/// <param name="password">The password</param>
/// <param name="logonType">The logon type</param>
/// <param name="logonProvider">The logon provides</param>
/// <param name="userToken">The out parameter that will contain the user
/// token when method succeeds.</param>
/// <returns><c>True</c> when succeeded; otherwise <c>false</c>.</returns>
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool LogonUser(string username, string domain,
string password, LogonType logonType,
LogonProvider logonProvider,
out IntPtr userToken);
/// <summary>
/// Creates a new access token that duplicates one already in existence.
/// </summary>
/// <param name="token">Handle to an access token.</param>
/// <param name="impersonationLevel">The impersonation level.</param>
/// <param name="duplication">Reference to the token to duplicate.</param>
/// <returns></returns>
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern bool DuplicateToken(IntPtr token, int impersonationLevel,
ref IntPtr duplication);
/// <summary>
/// The ImpersonateLoggedOnUser function lets the calling thread impersonate the
/// security context of a logged-on user. The user is represented by a token handle.
/// </summary>
/// <param name="userToken">Handle to a primary or impersonation access token that represents a logged-on user.</param>
/// <returns>If the function succeeds, the return value is nonzero.</returns>
[DllImport("advapi32.dll", SetLastError = true)]
static extern bool ImpersonateLoggedOnUser(IntPtr userToken);
#endregion
#region Private members
/// <summary>
/// <c>true</c> if disposed; otherwise, <c>false</c>.
/// </summary>
private bool _disposed;
/// <summary>
/// Holds the created impersonation context and will be used
/// for reverting to previous user.
/// </summary>
private WindowsImpersonationContext _impersonationContext;
#endregion
#region Ctor & Dtor
/// <summary>
/// Initializes a new instance of the <see cref="Impersonation"/> class and
/// impersonates as a built in service account.
/// </summary>
/// <param name="builtinUser">The built in user to impersonate - either
/// Local Service or Network Service. These users can only be impersonated
/// by code running as System.</param>
public Impersonation(BuiltinUser builtinUser)
: this(String.Empty, "NT AUTHORITY", String.Empty, LogonType.Service, builtinUser)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="Impersonation"/> class and
/// impersonates with the specified credentials.
/// </summary>
/// <param name="username">his is the name of the user account to log on
/// to. If you use the user principal name (UPN) format,
/// user@DNS_domain_name, the lpszDomain parameter must be <c>null</c>.</param>
/// <param name="domain">The name of the domain or server whose account
/// database contains the lpszUsername account. If this parameter is
/// <c>null</c>, the user name must be specified in UPN format. If this
/// parameter is ".", the function validates the account by using only the
/// local account database.</param>
/// <param name="password">The plaintext password for the user account.</param>
public Impersonation(String username, String domain, String password)
: this(username, domain, password, LogonType.Interactive, BuiltinUser.None)
{
}
private Impersonation(String username, String domain, String password, LogonType logonType, BuiltinUser builtinUser)
{
switch (builtinUser)
{
case BuiltinUser.None: if (String.IsNullOrEmpty(username)) return; break;
case BuiltinUser.LocalService: username = "LOCAL SERVICE"; break;
case BuiltinUser.NetworkService: username = "NETWORK SERVICE"; break;
}
IntPtr userToken = IntPtr.Zero;
IntPtr userTokenDuplication = IntPtr.Zero;
// Logon with user and get token.
bool loggedOn = LogonUser(username, domain, password,
logonType, LogonProvider.Default,
out userToken);
if (loggedOn)
{
try
{
// Create a duplication of the usertoken, this is a solution
// for the known bug that is published under KB article Q319615.
if (DuplicateToken(userToken, 2, ref userTokenDuplication))
{
// Create windows identity from the token and impersonate the user.
WindowsIdentity identity = new WindowsIdentity(userTokenDuplication);
_impersonationContext = identity.Impersonate();
}
else
{
// Token duplication failed!
// Use the default ctor overload
// that will use Mashal.GetLastWin32Error();
// to create the exceptions details.
throw new Win32Exception();
}
}
finally
{
// Close usertoken handle duplication when created.
if (!userTokenDuplication.Equals(IntPtr.Zero))
{
// Closes the handle of the user.
CloseHandle(userTokenDuplication);
userTokenDuplication = IntPtr.Zero;
}
// Close usertoken handle when created.
if (!userToken.Equals(IntPtr.Zero))
{
// Closes the handle of the user.
CloseHandle(userToken);
userToken = IntPtr.Zero;
}
}
}
else
{
// Logon failed!
// Use the default ctor overload that
// will use Mashal.GetLastWin32Error();
// to create the exceptions details.
throw new Win32Exception();
}
}
/// <summary>
/// Releases unmanaged resources and performs other cleanup operations before the
/// <see cref="Born2Code.Net.Impersonation"/> is reclaimed by garbage collection.
/// </summary>
~Impersonation()
{
Dispose(false);
}
#endregion
#region Public methods
/// <summary>
/// Reverts to the previous user.
/// </summary>
public void Revert()
{
if (_impersonationContext != null)
{
// Revert to previour user.
_impersonationContext.Undo();
_impersonationContext = null;
}
}
#endregion
#region IDisposable implementation.
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or
/// resetting unmanaged resources and will revent to the previous user when
/// the impersonation still exists.
/// </summary>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or
/// resetting unmanaged resources and will revent to the previous user when
/// the impersonation still exists.
/// </summary>
/// <param name="disposing">Specify <c>true</c> when calling the method directly
/// or indirectly by a user’s code; Otherwise <c>false</c>.
protected virtual void Dispose(bool disposing)
{
if (!_disposed)
{
Revert();
_disposed = true;
}
}
#endregion
}
#region Enums
public enum LogonType : int
{
/// <summary>
/// This logon type is intended for users who will be interactively using the computer, such as a user being logged on
/// by a terminal server, remote shell, or similar process.
/// This logon type has the additional expense of caching logon information for disconnected operations;
/// therefore, it is inappropriate for some client/server applications,
/// such as a mail server.
/// </summary>
Interactive = 2,
/// <summary>
/// This logon type is intended for high performance servers to authenticate plaintext passwords.
/// The LogonUser function does not cache credentials for this logon type.
/// </summary>
Network = 3,
/// <summary>
/// This logon type is intended for batch servers, where processes may be executing on behalf of a user without
/// their direct intervention. This type is also for higher performance servers that process many plaintext
/// authentication attempts at a time, such as mail or Web servers.
/// The LogonUser function does not cache credentials for this logon type.
/// </summary>
Batch = 4,
/// <summary>
/// Indicates a service-type logon. The account provided must have the service privilege enabled.
/// </summary>
Service = 5,
/// <summary>
/// This logon type is for GINA DLLs that log on users who will be interactively using the computer.
/// This logon type can generate a unique audit record that shows when the workstation was unlocked.
/// </summary>
Unlock = 7,
/// <summary>
/// This logon type preserves the name and password in the authentication package, which allows the server to make
/// connections to other network servers while impersonating the client. A server can accept plaintext credentials
/// from a client, call LogonUser, verify that the user can access the system across the network, and still
/// communicate with other servers.
/// NOTE: Windows NT: This value is not supported.
/// </summary>
NetworkCleartText = 8,
/// <summary>
/// This logon type allows the caller to clone its current token and specify new credentials for outbound connections.
/// The new logon session has the same local identifier but uses different credentials for other network connections.
/// NOTE: This logon type is supported only by the LOGON32_PROVIDER_WINNT50 logon provider.
/// NOTE: Windows NT: This value is not supported.
/// </summary>
NewCredentials = 9,
}
public enum LogonProvider : int
{
/// <summary>
/// Use the standard logon provider for the system.
/// The default security provider is negotiate, unless you pass NULL for the domain name and the user name
/// is not in UPN format. In this case, the default provider is NTLM.
/// NOTE: Windows 2000/NT: The default security provider is NTLM.
/// </summary>
Default = 0,
}
public enum BuiltinUser
{
None,
LocalService,
NetworkService
}
#endregion
} |
Copie de fichiers avec un compte utilisateur différent
Répondre avec citation
Partager