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
|
// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/component_updater/media_foundation_widevine_cdm_component_installer.h"
#include <stdint.h>
#include <memory>
#include <optional>
#include <string>
#include <vector>
#include "base/feature_list.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/metrics/histogram_functions.h"
#include "base/native_library.h"
#include "base/values.h"
#include "base/version.h"
#include "base/win/security_util.h"
#include "base/win/sid.h"
#include "build/build_config.h"
#include "chrome/browser/media/media_foundation_service_monitor.h"
#include "components/component_updater/component_updater_paths.h"
#include "content/public/browser/cdm_registry.h"
#include "content/public/common/cdm_info.h"
#include "media/base/media_switches.h"
#include "media/base/win/mf_feature_checks.h"
#include "media/cdm/win/media_foundation_cdm.h"
#include "sandbox/policy/win/lpac_capability.h"
#include "third_party/widevine/cdm/widevine_cdm_common.h"
namespace {
// The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
// The extension id is: neifaoindggfcjicffkgpmnlppeffabd
const uint8_t kMediaFoundationWidevineCdmPublicKeySHA256[32] = {
0xd4, 0x85, 0x0e, 0x8d, 0x36, 0x65, 0x29, 0x82, 0x55, 0xa6, 0xfc,
0xdb, 0xff, 0x45, 0x50, 0x13, 0x5f, 0xed, 0x02, 0x65, 0xb5, 0x19,
0x8e, 0xa0, 0x5b, 0x38, 0x38, 0xc9, 0x32, 0x3a, 0x9f, 0xf1};
base::FilePath GetCdmPath(const base::FilePath& install_dir) {
return install_dir.AppendASCII(
base::GetNativeLibraryName(kMediaFoundationWidevineCdmLibraryName));
}
// Name of the Widevine CDM architecture to avoid registering the wrong CDM.
const char kWidevineCdmArch[] =
#if defined(ARCH_CPU_X86)
"x86";
#elif defined(ARCH_CPU_X86_64)
"x64";
#elif defined(ARCH_CPU_ARMEL)
"arm";
#elif defined(ARCH_CPU_ARM64)
"arm64";
#else
#error This file should only be included for supported architecture.
#endif
} // namespace
namespace component_updater {
// Allows this component to be disabled via `ComponentUpdatesEnabled` policy.
// See https://chromeenterprise.google/policies/?policy=ComponentUpdatesEnabled
bool MediaFoundationWidevineCdmComponentInstallerPolicy::
SupportsGroupPolicyEnabledComponentUpdates() const {
return true;
}
bool MediaFoundationWidevineCdmComponentInstallerPolicy::
RequiresNetworkEncryption() const {
return false;
}
// Set permission on `install_dir` so the CDM can be loaded in the LPAC process.
update_client::CrxInstaller::Result
MediaFoundationWidevineCdmComponentInstallerPolicy::OnCustomInstall(
const base::Value::Dict& manifest,
const base::FilePath& install_dir) {
DVLOG(1) << __func__ << ": Set permission on " << install_dir;
auto sids = base::win::Sid::FromNamedCapabilityVector(
{sandbox::policy::kMediaFoundationCdmFiles});
bool success = base::win::GrantAccessToPath(
install_dir, sids, FILE_GENERIC_READ | FILE_GENERIC_EXECUTE,
CONTAINER_INHERIT_ACE | OBJECT_INHERIT_ACE);
return update_client::CrxInstaller::Result(
success ? update_client::InstallError::NONE
: update_client::InstallError::SET_PERMISSIONS_FAILED);
}
void MediaFoundationWidevineCdmComponentInstallerPolicy::OnCustomUninstall() {}
void MediaFoundationWidevineCdmComponentInstallerPolicy::ComponentReady(
const base::Version& version,
const base::FilePath& install_dir,
base::Value::Dict manifest) {
VLOG(1) << "Component ready, version " << version.GetString() << " in "
<< install_dir.value();
VLOG(1) << "Register Media Foundation Widevine CDM";
content::CdmInfo cdm_info(
kWidevineKeySystem, content::CdmInfo::Robustness::kHardwareSecure,
/*capability=*/std::nullopt, /*supports_sub_key_systems=*/false,
kMediaFoundationWidevineCdmDisplayName, kMediaFoundationWidevineCdmType,
version, GetCdmPath(install_dir));
// Ensures MediaFoundationService process is monitored.
MediaFoundationServiceMonitor::GetInstance();
// Check whether hardware secure decryption CDM should be disabled.
if (base::FeatureList::IsEnabled(media::kHardwareSecureDecryptionFallback) &&
!media::kHardwareSecureDecryptionFallbackPerSite.Get() &&
MediaFoundationServiceMonitor::
IsHardwareSecureDecryptionDisabledByPref()) {
VLOG(1) << "Media Foundation Widevine CDM disabled due to previous errors";
cdm_info.status = content::CdmInfo::Status::kDisabledByPref;
base::UmaHistogramBoolean("Media.EME.Widevine.HardwareSecure.Pref", false);
} else {
base::UmaHistogramBoolean("Media.EME.Widevine.HardwareSecure.Pref", true);
}
content::CdmRegistry::GetInstance()->RegisterCdm(cdm_info);
}
// Called during startup and installation before ComponentReady().
bool MediaFoundationWidevineCdmComponentInstallerPolicy::VerifyInstallation(
const base::Value::Dict& manifest,
const base::FilePath& install_dir) const {
return base::PathExists(GetCdmPath(install_dir));
}
// The relative install directory looks like:
// <user-data-dir>\MediaFoundationWidevineCdm\<arch>.
base::FilePath
MediaFoundationWidevineCdmComponentInstallerPolicy::GetRelativeInstallDir()
const {
return base::FilePath::FromUTF8Unsafe(
kMediaFoundationWidevineCdmBaseDirection)
.AppendASCII(kWidevineCdmArch);
}
void MediaFoundationWidevineCdmComponentInstallerPolicy::GetHash(
std::vector<uint8_t>* hash) const {
hash->assign(std::begin(kMediaFoundationWidevineCdmPublicKeySHA256),
std::end(kMediaFoundationWidevineCdmPublicKeySHA256));
}
std::string MediaFoundationWidevineCdmComponentInstallerPolicy::GetName()
const {
return kMediaFoundationWidevineCdmDisplayName;
}
update_client::InstallerAttributes
MediaFoundationWidevineCdmComponentInstallerPolicy::GetInstallerAttributes()
const {
return update_client::InstallerAttributes();
}
void RegisterMediaFoundationWidevineCdmComponent(
component_updater::ComponentUpdateService* cus) {
if (media::SupportMediaFoundationEncryptedPlayback()) {
VLOG(1) << "Registering Media Foundation Widevine CDM component.";
auto installer = base::MakeRefCounted<ComponentInstaller>(
std::make_unique<MediaFoundationWidevineCdmComponentInstallerPolicy>());
installer->Register(cus, base::NullCallback());
}
}
} // namespace component_updater
|
