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
| /// <summary>
/// An impersonation class (modified from http://born2code.net/?page_id=45) that supports LocalService and NetworkService logons.
/// Note: To use these built-in logons the code must be running under the local system account.
/// </summary>
public class CustomImpersonation : 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>
[System.Runtime.InteropServices.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>
[System.Runtime.InteropServices.DllImport("advapi32.dll", CharSet = System.Runtime.InteropServices.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>
[System.Runtime.InteropServices.DllImport("advapi32.dll", CharSet = System.Runtime.InteropServices.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>
[System.Runtime.InteropServices.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 System.Security.Principal.WindowsImpersonationContext _impersonationContext;
#endregion
#region Public Members
public bool IsAuthenticated { get; set; }
public string Domain { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
public string CurrentName
{
get
{
return System.Security.Principal.WindowsIdentity.GetCurrent().Name;
}
}
#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 CustomImpersonation(BuiltinUser builtinUser)
{
Domain = "NT AUTHORITY";
UserName = string.Empty;
Password = string.Empty;
this.Impersonation(LogonType.Service, builtinUser);
}
/// <summary>
/// Initializes a new instance of the <see cref="Impersonation"/> class and
/// impersonates with the specified credentials.
/// </summary>
/// <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="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="password">The plaintext password for the user account.</param>
public CustomImpersonation(string domain, string username, string password)
{
Domain = domain;
UserName = username;
Password = password;
this.Impersonation(LogonType.Interactive, BuiltinUser.None);
}
/// <summary>
/// Releases unmanaged resources and performs other cleanup operations before the
/// <see cref="Born2Code.Net.Impersonation"/> is reclaimed by garbage collection.
/// </summary>
~CustomImpersonation()
{
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;
}
}
public bool Authenticate()
{
IsAuthenticated = this.Impersonation(LogonType.Interactive, BuiltinUser.None);
return IsAuthenticated;
}
public bool Authenticate(string domain, string username, string password)
{
Domain = domain;
UserName = username;
Password = password;
IsAuthenticated = this.Authenticate();
return IsAuthenticated;
}
#endregion
#region Private methods
private bool Impersonation(LogonType logonType, BuiltinUser builtinUser)
{
#region switch (builtinUser)
switch (builtinUser)
{
case BuiltinUser.None:
if (string.IsNullOrEmpty(UserName))
return false;
break;
case BuiltinUser.LocalService:
UserName = "LOCAL SERVICE";
break;
case BuiltinUser.NetworkService:
UserName = "NETWORK SERVICE";
break;
}
#endregion
IntPtr userToken = IntPtr.Zero;
IntPtr userTokenDuplication = IntPtr.Zero;
// Logon with user and get token.
IsAuthenticated = LogonUser(UserName, Domain, Password, logonType, LogonProvider.Default, out userToken);
if (IsAuthenticated)
{
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.
using (System.Security.Principal.WindowsIdentity identity = new System.Security.Principal.WindowsIdentity(userTokenDuplication))
{
_impersonationContext = identity.Impersonate();
return true;
}
}
else
{
// Token duplication failed! Use the default ctor overload that will use Mashal.GetLastWin32Error(); to create the exceptions details.
//throw new Win32Exception();
return false;
}
}
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();
return false;
}
}
#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,
None = 0
}
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 |
Comment réaliser une impersonation en .Net dans une application Windows fonctionnant sous XP?
Envoyé par eusebe19
Sur ce point, je peux te donner une demie piste : je n'ai pas essayé sur Vista ou Seven, mais je peux te garantir que cela fonctionne parfaitement sur Windows Server 2008, donc ce serait à priori ce serait OK pour Vista.
Répondre avec citation
Partager