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
|
//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.IdentityModel
{
using System.Collections.Generic;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;
using System.Security.AccessControl;
using System.Security.Principal;
using System.ServiceModel.Diagnostics;
using System.Runtime.Versioning;
class Privilege
{
static Dictionary<string, LUID> luids = new Dictionary<string, LUID>();
public const string SeAuditPrivilege = "SeAuditPrivilege";
public const string SeTcbPrivilege = "SeTcbPrivilege";
const uint SE_PRIVILEGE_DISABLED = 0x00000000;
const uint SE_PRIVILEGE_ENABLED_BY_DEFAULT = 0x00000001;
const uint SE_PRIVILEGE_ENABLED = 0x00000002;
const uint SE_PRIVILEGE_USED_FOR_ACCESS = 0x80000000;
const int ERROR_SUCCESS = 0x0;
const int ERROR_NO_TOKEN = 0x3F0;
const int ERROR_NOT_ALL_ASSIGNED = 0x514;
string privilege;
LUID luid;
bool needToRevert = false;
bool initialEnabled = false;
bool isImpersonating = false;
SafeCloseHandle threadToken = null;
public Privilege(string privilege)
{
this.privilege = privilege;
this.luid = LuidFromPrivilege(privilege);
}
public void Enable()
{
// Note: AdjustTokenPrivileges should not try to adjust if the token is
// Primary token (process). Duplicate the process token (impersonation) and
// then set token to current thread and unsetting (RevertToSelf) later.
DiagnosticUtility.DebugAssert(this.threadToken == null, "");
this.threadToken = GetThreadToken();
EnableTokenPrivilege(this.threadToken);
}
// Have to run in CER
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
public int Revert()
{
if (!this.isImpersonating)
{
if (this.needToRevert && !this.initialEnabled)
{
TOKEN_PRIVILEGE newState;
newState.PrivilegeCount = 1;
newState.Privilege.Luid = this.luid;
newState.Privilege.Attributes = SE_PRIVILEGE_DISABLED;
TOKEN_PRIVILEGE previousState;
uint previousSize = 0;
if (!NativeMethods.AdjustTokenPrivileges(
this.threadToken,
false,
ref newState,
TOKEN_PRIVILEGE.Size,
out previousState,
out previousSize))
{
return Marshal.GetLastWin32Error();
}
}
this.needToRevert = false;
}
else
{
if (!NativeMethods.RevertToSelf())
{
return Marshal.GetLastWin32Error();
}
this.isImpersonating = false;
}
if (this.threadToken != null)
{
this.threadToken.Close();
this.threadToken = null;
}
return ERROR_SUCCESS;
}
[ResourceExposure(ResourceScope.None)]
[ResourceConsumption( ResourceScope.Process, ResourceScope.Process )]
SafeCloseHandle GetThreadToken()
{
//
// Open the thread token; if there is no thread token, get one from
// the process token by impersonating self.
//
SafeCloseHandle threadToken;
if (!NativeMethods.OpenThreadToken(
NativeMethods.GetCurrentThread(),
TokenAccessLevels.Query | TokenAccessLevels.AdjustPrivileges,
true,
out threadToken))
{
int error = Marshal.GetLastWin32Error();
Utility.CloseInvalidOutSafeHandle(threadToken);
if (error != ERROR_NO_TOKEN)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new Win32Exception(error));
}
else
{
SafeCloseHandle processToken;
if (!NativeMethods.OpenProcessToken(
NativeMethods.GetCurrentProcess(),
TokenAccessLevels.Duplicate,
out processToken))
{
error = Marshal.GetLastWin32Error();
Utility.CloseInvalidOutSafeHandle(processToken);
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new Win32Exception(error));
}
try
{
if (!NativeMethods.DuplicateTokenEx(
processToken,
TokenAccessLevels.Impersonate | TokenAccessLevels.Query | TokenAccessLevels.AdjustPrivileges,
IntPtr.Zero,
SECURITY_IMPERSONATION_LEVEL.Impersonation,
TokenType.TokenImpersonation,
out threadToken))
{
error = Marshal.GetLastWin32Error();
Utility.CloseInvalidOutSafeHandle(threadToken);
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new Win32Exception(error));
}
SetThreadToken(threadToken);
}
finally
{
processToken.Close();
}
}
}
return threadToken;
}
void EnableTokenPrivilege(SafeCloseHandle threadToken)
{
DiagnosticUtility.DebugAssert(!this.needToRevert, "");
TOKEN_PRIVILEGE newState;
newState.PrivilegeCount = 1;
newState.Privilege.Luid = this.luid;
newState.Privilege.Attributes = SE_PRIVILEGE_ENABLED;
TOKEN_PRIVILEGE previousState;
uint previousSize = 0;
bool success = false;
int error = 0;
// CER
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
success = NativeMethods.AdjustTokenPrivileges(
threadToken,
false,
ref newState,
TOKEN_PRIVILEGE.Size,
out previousState,
out previousSize);
error = Marshal.GetLastWin32Error();
if (success && error == ERROR_SUCCESS)
{
this.initialEnabled = (0 != (previousState.Privilege.Attributes & SE_PRIVILEGE_ENABLED));
this.needToRevert = true;
}
}
if (error == ERROR_NOT_ALL_ASSIGNED)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new PrivilegeNotHeldException(this.privilege));
}
else if (!success)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new Win32Exception(error));
}
}
void SetThreadToken(SafeCloseHandle threadToken)
{
DiagnosticUtility.DebugAssert(!this.isImpersonating, "");
int error = 0;
// CER
RuntimeHelpers.PrepareConstrainedRegions();
try
{
}
finally
{
if (!NativeMethods.SetThreadToken(IntPtr.Zero, threadToken))
{
error = Marshal.GetLastWin32Error();
}
else
{
this.isImpersonating = true;
}
}
if (!this.isImpersonating)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new Win32Exception(error));
}
}
static LUID LuidFromPrivilege(string privilege)
{
LUID luid;
lock (luids)
{
if (luids.TryGetValue(privilege, out luid))
{
return luid;
}
}
if (!NativeMethods.LookupPrivilegeValueW(null, privilege, out luid))
{
int error = Marshal.GetLastWin32Error();
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new Win32Exception(error));
}
lock (luids)
{
if (!luids.ContainsKey(privilege))
{
luids[privilege] = luid;
}
}
return luid;
}
}
}
|
