blob: b0b24bf7d0399391260615107d3ffeea2e9cbede (
plain)
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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/SandboxSettings.h"
#include "mozISandboxSettings.h"
#include "nsServiceManagerUtils.h"
#include "mozilla/Components.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_media.h"
#include "mozilla/StaticPrefs_security.h"
#include "mozilla/StaticPrefs_webgl.h"
#include "prenv.h"
#ifdef XP_WIN
# include "mozilla/gfx/gfxVars.h"
# include "mozilla/WindowsVersion.h"
# include "nsExceptionHandler.h"
#endif // XP_WIN
using namespace mozilla;
namespace mozilla {
const char* ContentWin32kLockdownStateToString(
nsIXULRuntime::ContentWin32kLockdownState aValue) {
switch (aValue) {
case nsIXULRuntime::ContentWin32kLockdownState::LockdownEnabled:
return "Win32k Lockdown enabled";
case nsIXULRuntime::ContentWin32kLockdownState::MissingWebRender:
return "Win32k Lockdown disabled -- Missing WebRender";
case nsIXULRuntime::ContentWin32kLockdownState::OperatingSystemNotSupported:
return "Win32k Lockdown disabled -- Operating system not supported";
case nsIXULRuntime::ContentWin32kLockdownState::PrefNotSet:
return "Win32k Lockdown disabled -- Preference not set";
case nsIXULRuntime::ContentWin32kLockdownState::MissingRemoteWebGL:
return "Win32k Lockdown disabled -- Missing Remote WebGL";
case nsIXULRuntime::ContentWin32kLockdownState::MissingNonNativeTheming:
return "Win32k Lockdown disabled -- Missing Non-Native Theming";
case nsIXULRuntime::ContentWin32kLockdownState::DecodersArentRemote:
return "Win32k Lockdown disabled -- Not all media decoders are remoted "
"to Utility Process";
case nsIXULRuntime::ContentWin32kLockdownState::DisabledByEnvVar:
return "Win32k Lockdown disabled -- MOZ_ENABLE_WIN32K is set";
case nsIXULRuntime::ContentWin32kLockdownState::DisabledBySafeMode:
return "Win32k Lockdown disabled -- Running in Safe Mode";
case nsIXULRuntime::ContentWin32kLockdownState::DisabledByE10S:
return "Win32k Lockdown disabled -- E10S is disabled";
case nsIXULRuntime::ContentWin32kLockdownState::DisabledByUserPref:
return "Win32k Lockdown disabled -- manually set "
"security.sandbox.content.win32k-disable to false";
case nsIXULRuntime::ContentWin32kLockdownState::EnabledByUserPref:
return "Win32k Lockdown enabled -- manually set "
"security.sandbox.content.win32k-disable to true";
case nsIXULRuntime::ContentWin32kLockdownState::DisabledByControlGroup:
return "Win32k Lockdown disabled -- user in Control Group";
case nsIXULRuntime::ContentWin32kLockdownState::EnabledByTreatmentGroup:
return "Win32k Lockdown enabled -- user in Treatment Group";
case nsIXULRuntime::ContentWin32kLockdownState::DisabledByDefault:
return "Win32k Lockdown disabled -- default value is false";
case nsIXULRuntime::ContentWin32kLockdownState::EnabledByDefault:
return "Win32k Lockdown enabled -- default value is true";
case nsIXULRuntime::ContentWin32kLockdownState::
IncompatibleMitigationPolicy:
return "Win32k Lockdown disabled -- Incompatible Windows Exploit "
"Protection policies enabled";
}
MOZ_CRASH("Should never reach here");
}
bool GetContentWin32kLockdownEnabled() {
auto state = GetContentWin32kLockdownState();
return state ==
nsIXULRuntime::ContentWin32kLockdownState::EnabledByUserPref ||
state == nsIXULRuntime::ContentWin32kLockdownState::
EnabledByTreatmentGroup ||
state == nsIXULRuntime::ContentWin32kLockdownState::EnabledByDefault;
}
nsIXULRuntime::ContentWin32kLockdownState GetContentWin32kLockdownState() {
#ifdef XP_WIN
static auto getLockdownState = [] {
auto state = GetWin32kLockdownState();
const char* stateStr = ContentWin32kLockdownStateToString(state);
CrashReporter::AnnotateCrashReport(
CrashReporter::Annotation::ContentSandboxWin32kState,
nsDependentCString(stateStr));
return state;
};
static nsIXULRuntime::ContentWin32kLockdownState result = getLockdownState();
return result;
#else // XP_WIN
return nsIXULRuntime::ContentWin32kLockdownState::OperatingSystemNotSupported;
#endif // XP_WIN
}
int GetEffectiveContentSandboxLevel() {
if (PR_GetEnv("MOZ_DISABLE_CONTENT_SANDBOX")) {
return 0;
}
int level = StaticPrefs::security_sandbox_content_level_DoNotUseDirectly();
// On Windows and macOS, enforce a minimum content sandbox level of 1 (except on
// Nightly, where it can be set to 0).
#if !defined(NIGHTLY_BUILD) && (defined(XP_WIN) || defined(XP_MACOSX))
if (level < 1) {
level = 1;
}
#endif
#ifdef XP_LINUX
// Level 1 was a configuration with default-deny seccomp-bpf but
// which allowed direct filesystem access; that required additional
// code for the syscall filter which was untested and tended to
// bit-rot. It was trivially escapable and was no longer being used
// even for debugging, so it has been removed.
//
// If the content sandbox is enabled, enforce a minimum level of 2.
static constexpr int kMinSupportedLevel = 2;
if (level > 0 && level <= kMinSupportedLevel) {
level = kMinSupportedLevel;
}
// Level 4 and up will break direct access to audio.
if (level > 3 && !StaticPrefs::media_cubeb_sandbox()) {
level = 3;
}
#endif
return level;
}
bool IsContentSandboxEnabled() { return GetEffectiveContentSandboxLevel() > 0; }
int GetEffectiveSocketProcessSandboxLevel() {
if (PR_GetEnv("MOZ_DISABLE_SOCKET_PROCESS_SANDBOX")) {
return 0;
}
int level =
StaticPrefs::security_sandbox_socket_process_level_DoNotUseDirectly();
return level;
}
int GetEffectiveGpuSandboxLevel() {
return StaticPrefs::security_sandbox_gpu_level();
}
#if defined(XP_MACOSX)
int ClampFlashSandboxLevel(const int aLevel) {
const int minLevel = 0;
const int maxLevel = 3;
if (aLevel < minLevel) {
return minLevel;
}
if (aLevel > maxLevel) {
return maxLevel;
}
return aLevel;
}
#endif
class SandboxSettings final : public mozISandboxSettings {
public:
NS_DECL_ISUPPORTS
NS_DECL_MOZISANDBOXSETTINGS
SandboxSettings() = default;
private:
~SandboxSettings() = default;
};
NS_IMPL_ISUPPORTS(SandboxSettings, mozISandboxSettings)
NS_IMETHODIMP SandboxSettings::GetEffectiveContentSandboxLevel(
int32_t* aRetVal) {
*aRetVal = mozilla::GetEffectiveContentSandboxLevel();
return NS_OK;
}
NS_IMETHODIMP SandboxSettings::GetContentWin32kLockdownState(int32_t* aRetVal) {
*aRetVal = static_cast<int32_t>(mozilla::GetContentWin32kLockdownState());
return NS_OK;
}
NS_IMETHODIMP
SandboxSettings::GetContentWin32kLockdownStateString(nsAString& aString) {
nsIXULRuntime::ContentWin32kLockdownState lockdownState =
mozilla::GetContentWin32kLockdownState();
aString = NS_ConvertASCIItoUTF16(
mozilla::ContentWin32kLockdownStateToString(lockdownState));
return NS_OK;
}
} // namespace mozilla
NS_IMPL_COMPONENT_FACTORY(mozISandboxSettings) {
return MakeAndAddRef<SandboxSettings>().downcast<nsISupports>();
}
|
