398 lines
14 KiB
C++
398 lines
14 KiB
C++
// Copyright 2016 The Chromium Embedded Framework Authors. Portions copyright
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// 2013 the Chromium Authors. All rights reserved. Use of this source code is
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// governed by a BSD-style license that can be found in the LICENSE file.
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#include "libcef/common/widevine_loader.h"
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#if defined(WIDEVINE_CDM_AVAILABLE) && BUILDFLAG(ENABLE_LIBRARY_CDMS)
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#include "libcef/browser/context.h"
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#include "libcef/browser/thread_util.h"
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#include "libcef/common/cef_switches.h"
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#include "base/command_line.h"
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#include "base/files/file_util.h"
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#include "base/json/json_string_value_serializer.h"
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#include "base/memory/ptr_util.h"
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#include "base/native_library.h"
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#include "base/strings/string_number_conversions.h"
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#include "base/strings/string_split.h"
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#include "base/strings/utf_string_conversions.h"
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#include "chrome/common/widevine_cdm_constants.h"
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#include "content/browser/plugin_service_impl.h"
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#include "content/public/browser/cdm_registry.h"
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#include "content/public/common/cdm_info.h"
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#include "content/public/common/content_switches.h"
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#include "media/cdm/supported_cdm_versions.h"
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namespace {
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base::LazyInstance<CefWidevineLoader>::Leaky g_widevine_loader =
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LAZY_INSTANCE_INITIALIZER;
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// Based on chrome/browser/component_updater/widevine_cdm_component_installer.cc
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// Name of the Widevine CDM OS in the component manifest.
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const char kWidevineCdmOs[] =
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#if defined(OS_MACOSX)
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"mac";
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#elif defined(OS_WIN)
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"win";
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#else // OS_LINUX, etc. TODO(viettrungluu): Separate out Chrome OS and Android?
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"linux";
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#endif
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// Name of the Widevine CDM architecture in the component manifest.
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const char kWidevineCdmArch[] =
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#if defined(ARCH_CPU_X86)
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"ia32"; // This differs from the component updater which uses "x86".
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#elif defined(ARCH_CPU_X86_64)
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"x64";
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#else // TODO(viettrungluu): Support an ARM check?
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"???";
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#endif
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// The CDM OS and architecture.
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const char kCdmOsName[] = "os";
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const char kCdmArchName[] = "arch";
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// The CDM version (e.g. "1.4.8.903").
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const char kCdmVersionName[] = "version";
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// The CDM manifest includes several custom values, all beginning with "x-cdm-".
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// All values are strings.
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// All values that are lists are delimited by commas. No trailing commas.
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// For example, "1,2,4".
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const char kCdmValueDelimiter = ',';
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static_assert(kCdmValueDelimiter == kCdmSupportedCodecsValueDelimiter,
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"cdm delimiters must match");
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// The following entries are required.
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// Interface versions are lists of integers (e.g. "1" or "1,2,4").
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// These are checked in this file before registering the CDM.
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// All match the interface versions from content_decryption_module.h that the
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// CDM supports.
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// Matches CDM_MODULE_VERSION.
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const char kCdmModuleVersionsName[] = "x-cdm-module-versions";
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// Matches supported ContentDecryptionModule_* version(s).
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const char kCdmInterfaceVersionsName[] = "x-cdm-interface-versions";
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// Matches supported Host_* version(s).
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const char kCdmHostVersionsName[] = "x-cdm-host-versions";
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// The codecs list is a list of simple codec names (e.g. "vp8,vorbis").
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// The list is passed to other parts of Chrome.
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const char kCdmCodecsListName[] = "x-cdm-codecs";
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std::unique_ptr<base::DictionaryValue> ParseManifestFile(
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const base::FilePath& manifest_path) {
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CEF_REQUIRE_FILET();
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// Manifest file should be < 1kb. Read at most 2kb.
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std::string manifest_contents;
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if (!base::ReadFileToStringWithMaxSize(manifest_path, &manifest_contents,
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2048)) {
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return nullptr;
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}
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JSONStringValueDeserializer deserializer(manifest_contents);
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std::unique_ptr<base::Value> manifest(deserializer.Deserialize(NULL, NULL));
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if (!manifest.get() || !manifest->IsType(base::Value::Type::DICTIONARY))
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return nullptr;
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// Transfer ownership to the caller.
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return base::WrapUnique(
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static_cast<base::DictionaryValue*>(manifest.release()));
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}
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std::string GetManifestValue(const base::DictionaryValue& manifest,
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const std::string& key,
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std::string* error_message) {
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std::stringstream ss;
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std::string value;
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if (!manifest.GetString(key, &value)) {
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ss << "Manifest missing " << key;
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*error_message = ss.str();
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} else if (value.empty()) {
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ss << "Manifest has empty " << key;
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*error_message = ss.str();
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}
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return value;
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}
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typedef bool (*VersionCheckFunc)(int version);
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bool CheckForCompatibleVersion(const base::DictionaryValue& manifest,
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const std::string version_name,
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VersionCheckFunc version_check_func,
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std::string* error_message) {
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std::string versions_string =
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GetManifestValue(manifest, version_name, error_message);
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if (versions_string.empty())
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return false;
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for (const base::StringPiece& ver_str : base::SplitStringPiece(
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versions_string, std::string(1, kCdmValueDelimiter),
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base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL)) {
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int version = 0;
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if (base::StringToInt(ver_str, &version))
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if (version_check_func(version))
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return true;
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}
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std::stringstream ss;
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ss << "Manifest has no supported " << version_name << " in '"
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<< versions_string << "'";
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*error_message = ss.str();
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return false;
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}
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// Returns whether the CDM's OS/platform and module/interface/host API versions,
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// as specified in the manifest, are compatible with this Chromium binary.
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bool IsCompatibleWithChrome(const base::DictionaryValue& manifest,
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std::string* error_message) {
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return GetManifestValue(manifest, kCdmOsName, error_message) ==
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kWidevineCdmOs &&
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GetManifestValue(manifest, kCdmArchName, error_message) ==
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kWidevineCdmArch &&
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CheckForCompatibleVersion(manifest, kCdmModuleVersionsName,
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media::IsSupportedCdmModuleVersion,
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error_message) &&
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CheckForCompatibleVersion(manifest, kCdmInterfaceVersionsName,
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media::IsSupportedCdmInterfaceVersion,
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error_message) &&
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CheckForCompatibleVersion(manifest, kCdmHostVersionsName,
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media::IsSupportedCdmHostVersion,
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error_message);
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}
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// Populate the PepperPluginInfo structure.
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void GetPluginInfo(const base::FilePath& cdm_adapter_path,
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const base::FilePath& cdm_path,
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const std::string& cdm_version,
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const std::string& cdm_codecs,
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content::PepperPluginInfo* widevine_cdm) {
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widevine_cdm->is_out_of_process = true;
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widevine_cdm->path = cdm_adapter_path;
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widevine_cdm->name = kWidevineCdmDisplayName;
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widevine_cdm->description =
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kWidevineCdmDescription + std::string(" (version: ") + cdm_version + ")";
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widevine_cdm->version = cdm_version;
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content::WebPluginMimeType widevine_cdm_mime_type(
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kWidevineCdmPluginMimeType, kWidevineCdmPluginExtension,
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kWidevineCdmPluginMimeTypeDescription);
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widevine_cdm_mime_type.additional_param_names.push_back(
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base::ASCIIToUTF16(kCdmSupportedCodecsParamName));
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widevine_cdm_mime_type.additional_param_values.push_back(
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base::ASCIIToUTF16(cdm_codecs));
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widevine_cdm->mime_types.push_back(widevine_cdm_mime_type);
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widevine_cdm->permissions = kWidevineCdmPluginPermissions;
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}
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// Verify and load the contents of |base_path|.
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cef_cdm_registration_error_t LoadWidevineCdmInfo(
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const base::FilePath& base_path,
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base::FilePath* cdm_adapter_path,
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base::FilePath* cdm_path,
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std::string* cdm_version,
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std::string* cdm_codecs,
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std::string* error_message) {
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std::stringstream ss;
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*cdm_adapter_path = base_path.AppendASCII(kWidevineCdmAdapterFileName);
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if (!base::PathExists(*cdm_adapter_path)) {
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ss << "Missing adapter file " << cdm_adapter_path->value();
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*error_message = ss.str();
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return CEF_CDM_REGISTRATION_ERROR_INCORRECT_CONTENTS;
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}
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*cdm_path = base_path.AppendASCII(
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base::GetNativeLibraryName(kWidevineCdmLibraryName));
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if (!base::PathExists(*cdm_path)) {
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ss << "Missing file " << cdm_path->value();
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*error_message = ss.str();
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return CEF_CDM_REGISTRATION_ERROR_INCORRECT_CONTENTS;
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}
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base::FilePath manifest_path = base_path.AppendASCII("manifest.json");
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if (!base::PathExists(manifest_path)) {
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ss << "Missing manifest file " << manifest_path.value();
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*error_message = ss.str();
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return CEF_CDM_REGISTRATION_ERROR_INCORRECT_CONTENTS;
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}
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std::unique_ptr<base::DictionaryValue> manifest =
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ParseManifestFile(manifest_path);
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if (!manifest) {
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ss << "Failed to parse manifest file " << manifest_path.value();
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*error_message = ss.str();
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return CEF_CDM_REGISTRATION_ERROR_INCORRECT_CONTENTS;
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}
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if (!IsCompatibleWithChrome(*manifest, error_message))
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return CEF_CDM_REGISTRATION_ERROR_INCOMPATIBLE;
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*cdm_version = GetManifestValue(*manifest, kCdmVersionName, error_message);
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if (cdm_version->empty())
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return CEF_CDM_REGISTRATION_ERROR_INCORRECT_CONTENTS;
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*cdm_codecs = GetManifestValue(*manifest, kCdmCodecsListName, error_message);
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if (cdm_codecs->empty())
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return CEF_CDM_REGISTRATION_ERROR_INCORRECT_CONTENTS;
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return CEF_CDM_REGISTRATION_ERROR_NONE;
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}
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void DeliverWidevineCdmCallback(cef_cdm_registration_error_t result,
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const std::string& error_message,
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CefRefPtr<CefRegisterCdmCallback> callback) {
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CEF_REQUIRE_UIT();
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if (result != CEF_CDM_REGISTRATION_ERROR_NONE)
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LOG(ERROR) << "Widevine CDM registration failed; " << error_message;
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if (callback)
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callback->OnCdmRegistrationComplete(result, error_message);
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}
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void RegisterWidevineCdmOnUIThread(const base::FilePath& cdm_adapter_path,
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const base::FilePath& cdm_path,
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const std::string& cdm_version,
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const std::string& cdm_codecs,
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CefRefPtr<CefRegisterCdmCallback> callback) {
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CEF_REQUIRE_UIT();
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content::PepperPluginInfo widevine_cdm;
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GetPluginInfo(cdm_adapter_path, cdm_path, cdm_version, cdm_codecs,
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&widevine_cdm);
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// true = Add to beginning of list to override any existing registrations.
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content::PluginService::GetInstance()->RegisterInternalPlugin(
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widevine_cdm.ToWebPluginInfo(), true);
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// Tell the browser to refresh the plugin list. Then tell all renderers to
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// update their plugin list caches.
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content::PluginService::GetInstance()->RefreshPlugins();
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content::PluginService::GetInstance()->PurgePluginListCache(NULL, false);
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// Also register Widevine with the CdmRegistry.
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const std::vector<std::string> codecs = base::SplitString(
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cdm_codecs, std::string(1, kCdmSupportedCodecsValueDelimiter),
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base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
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content::CdmRegistry::GetInstance()->RegisterCdm(content::CdmInfo(
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kWidevineCdmType, base::Version(cdm_version), cdm_path, codecs));
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DeliverWidevineCdmCallback(CEF_CDM_REGISTRATION_ERROR_NONE, std::string(),
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callback);
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}
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void LoadWidevineCdmInfoOnFileThread(
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const base::FilePath& base_path,
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CefRefPtr<CefRegisterCdmCallback> callback) {
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CEF_REQUIRE_FILET();
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base::FilePath cdm_adapter_path;
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base::FilePath cdm_path;
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std::string cdm_version;
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std::string cdm_codecs;
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std::string error_message;
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cef_cdm_registration_error_t result =
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LoadWidevineCdmInfo(base_path, &cdm_adapter_path, &cdm_path, &cdm_version,
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&cdm_codecs, &error_message);
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if (result != CEF_CDM_REGISTRATION_ERROR_NONE) {
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CEF_POST_TASK(CEF_UIT, base::Bind(DeliverWidevineCdmCallback, result,
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error_message, callback));
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return;
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}
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// Continue execution on the UI thread.
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CEF_POST_TASK(CEF_UIT,
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base::Bind(RegisterWidevineCdmOnUIThread, cdm_adapter_path,
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cdm_path, cdm_version, cdm_codecs, callback));
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}
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} // namespace
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// static
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CefWidevineLoader* CefWidevineLoader::GetInstance() {
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return &g_widevine_loader.Get();
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}
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void CefWidevineLoader::LoadWidevineCdm(
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const base::FilePath& path,
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CefRefPtr<CefRegisterCdmCallback> callback) {
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if (!CONTEXT_STATE_VALID()) {
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// Loading will proceed from OnContextInitialized().
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load_pending_ = true;
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path_ = path;
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callback_ = callback;
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return;
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}
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// Continue execution on the FILE thread.
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CEF_POST_TASK(CEF_FILET,
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base::Bind(LoadWidevineCdmInfoOnFileThread, path, callback));
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}
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void CefWidevineLoader::OnContextInitialized() {
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CEF_REQUIRE_UIT();
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if (load_pending_) {
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load_pending_ = false;
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LoadWidevineCdm(path_, callback_);
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callback_ = nullptr;
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}
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}
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#if defined(OS_LINUX)
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// static
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void CefWidevineLoader::AddPepperPlugins(
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std::vector<content::PepperPluginInfo>* plugins) {
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const base::CommandLine& command_line =
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*base::CommandLine::ForCurrentProcess();
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// Perform early plugin registration in the zygote process when the sandbox is
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// enabled to avoid "cannot open shared object file: Operation not permitted"
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// errors during plugin loading. This is because the Zygote process must pre-
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// load all plugins before initializing the sandbox.
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if (command_line.GetSwitchValueASCII(switches::kProcessType) !=
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switches::kZygoteProcess ||
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command_line.HasSwitch(switches::kNoSandbox)) {
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return;
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}
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// The Widevine CDM path is passed to the zygote process via
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// CefContentBrowserClient::AppendExtraCommandLineSwitches.
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const base::FilePath& base_path =
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command_line.GetSwitchValuePath(switches::kWidevineCdmPath);
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if (base_path.empty())
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return;
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// Load contents of the plugin directory synchronously. This only occurs once
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// on zygote process startup so should not have a huge performance penalty.
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base::FilePath cdm_adapter_path;
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base::FilePath cdm_path;
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std::string cdm_version;
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std::string cdm_codecs;
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std::string error_message;
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cef_cdm_registration_error_t result =
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LoadWidevineCdmInfo(base_path, &cdm_adapter_path, &cdm_path, &cdm_version,
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&cdm_codecs, &error_message);
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if (result != CEF_CDM_REGISTRATION_ERROR_NONE) {
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LOG(ERROR) << "Widevine CDM registration failed; " << error_message;
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return;
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}
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content::PepperPluginInfo widevine_cdm;
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GetPluginInfo(cdm_adapter_path, cdm_path, cdm_version, cdm_codecs,
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&widevine_cdm);
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plugins->push_back(widevine_cdm);
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}
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#endif // defined(OS_LINUX)
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CefWidevineLoader::CefWidevineLoader() {}
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CefWidevineLoader::~CefWidevineLoader() {}
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#endif // defined(WIDEVINE_CDM_AVAILABLE) && BUILDFLAG(ENABLE_LIBRARY_CDMS)
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