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
|
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/policy/configuration_policy_provider_win.h"
#include <userenv.h>
#include <algorithm>
#include "base/logging.h"
#include "base/object_watcher.h"
#include "base/registry.h"
#include "base/scoped_ptr.h"
#include "base/string_number_conversions.h"
#include "base/string_piece.h"
#include "base/string_util.h"
#include "base/sys_string_conversions.h"
#include "base/utf_string_conversions.h"
#include "base/values.h"
#include "chrome/common/policy_constants.h"
ConfigurationPolicyProviderWin::GroupPolicyChangeWatcher::
GroupPolicyChangeWatcher(ConfigurationPolicyProvider* provider)
: provider_(provider),
user_policy_changed_event_(false, false),
machine_policy_changed_event_(false, false) {
CHECK(RegisterGPNotification(user_policy_changed_event_.handle(), false));
CHECK(RegisterGPNotification(machine_policy_changed_event_.handle(), true));
user_policy_watcher_.StartWatching(
user_policy_changed_event_.handle(),
this);
machine_policy_watcher_.StartWatching(
machine_policy_changed_event_.handle(),
this);
}
void ConfigurationPolicyProviderWin::GroupPolicyChangeWatcher::
OnObjectSignaled(HANDLE object) {
provider_->NotifyStoreOfPolicyChange();
if (object == user_policy_changed_event_.handle()) {
user_policy_watcher_.StartWatching(
user_policy_changed_event_.handle(),
this);
} else if (object == machine_policy_changed_event_.handle()) {
machine_policy_watcher_.StartWatching(
machine_policy_changed_event_.handle(),
this);
} else {
// This method should only be called as a result of signals
// to the user- and machine-policy handle watchers.
NOTREACHED();
}
}
ConfigurationPolicyProviderWin::ConfigurationPolicyProviderWin() {
watcher_.reset(new GroupPolicyChangeWatcher(this));
}
bool ConfigurationPolicyProviderWin::GetRegistryPolicyString(
const string16& name, int index, string16* result) {
DWORD value_size = 0;
DWORD key_type = 0;
scoped_array<uint8> buffer;
RegKey policy_key;
string16 location = string16(policy::kRegistrySubKey);
string16 value_name = name;
if (index > 0) {
// This is a list value, treat |name| as a subkey.
location += ASCIIToUTF16("\\") + name;
value_name = base::IntToString16(index);
}
// First try the global policy.
if (!policy_key.Open(HKEY_LOCAL_MACHINE, location.c_str()) ||
!policy_key.ReadValue(value_name.c_str(), 0, &value_size, &key_type)) {
policy_key.Close();
// Fall back on user-specific policy.
if (!policy_key.Open(HKEY_CURRENT_USER, location.c_str()) ||
!policy_key.ReadValue(value_name.c_str(), 0, &value_size, &key_type)) {
return false;
}
}
if (key_type != REG_SZ)
return false;
// According to the Microsoft documentation, the string
// buffer may not be explicitly 0-terminated. Allocate a
// slightly larger buffer and pre-fill to zeros to guarantee
// the 0-termination.
buffer.reset(new uint8[value_size + 2]);
memset(buffer.get(), 0, value_size + 2);
policy_key.ReadValue(value_name.c_str(), buffer.get(), &value_size);
result->assign(reinterpret_cast<const wchar_t*>(buffer.get()));
return true;
}
bool ConfigurationPolicyProviderWin::GetRegistryPolicyStringList(
const string16& key, ListValue* result) {
int index = 0;
string16 policy_string;
while (GetRegistryPolicyString(key, ++index, &policy_string))
result->Append(Value::CreateStringValue(policy_string));
return true;
}
bool ConfigurationPolicyProviderWin::GetRegistryPolicyBoolean(
const string16& value_name, bool* result) {
DWORD value;
RegKey hkcu_policy_key(HKEY_LOCAL_MACHINE, policy::kRegistrySubKey, KEY_READ);
if (hkcu_policy_key.ReadValueDW(value_name.c_str(), &value)) {
*result = value != 0;
return true;
}
RegKey hklm_policy_key(HKEY_CURRENT_USER, policy::kRegistrySubKey, KEY_READ);
if (hklm_policy_key.ReadValueDW(value_name.c_str(), &value)) {
*result = value != 0;
return true;
}
return false;
}
bool ConfigurationPolicyProviderWin::GetRegistryPolicyInteger(
const string16& value_name, uint32* result) {
DWORD value;
RegKey hkcu_policy_key(HKEY_LOCAL_MACHINE, policy::kRegistrySubKey, KEY_READ);
if (hkcu_policy_key.ReadValueDW(value_name.c_str(), &value)) {
*result = value;
return true;
}
RegKey hklm_policy_key(HKEY_CURRENT_USER, policy::kRegistrySubKey, KEY_READ);
if (hklm_policy_key.ReadValueDW(value_name.c_str(), &value)) {
*result = value;
return true;
}
return false;
}
bool ConfigurationPolicyProviderWin::Provide(
ConfigurationPolicyStore* store) {
const PolicyValueMap* mapping = PolicyValueMapping();
for (PolicyValueMap::const_iterator current = mapping->begin();
current != mapping->end(); ++current) {
std::wstring name = UTF8ToWide(current->name);
switch (current->value_type) {
case Value::TYPE_STRING: {
std::wstring string_value;
if (GetRegistryPolicyString(name.c_str(), -1, &string_value)) {
store->Apply(current->policy_type,
Value::CreateStringValue(string_value));
}
break;
}
case Value::TYPE_LIST: {
scoped_ptr<ListValue> list_value(new ListValue);
if (GetRegistryPolicyStringList(name.c_str(), list_value.get()))
store->Apply(current->policy_type, list_value.release());
break;
}
case Value::TYPE_BOOLEAN: {
bool bool_value;
if (GetRegistryPolicyBoolean(name.c_str(), &bool_value)) {
store->Apply(current->policy_type,
Value::CreateBooleanValue(bool_value));
}
break;
}
case Value::TYPE_INTEGER: {
uint32 int_value;
if (GetRegistryPolicyInteger(name.c_str(), &int_value)) {
store->Apply(current->policy_type,
Value::CreateIntegerValue(int_value));
}
break;
}
default:
NOTREACHED();
return false;
}
}
return true;
}
|
