blob: 4f91cfbd152538414f8d4baf95fc5ca60a9e58dd [file] [log] [blame]
// Copyright (c) 2012 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 <memory>
#include <string>
#include "base/files/file_path.h"
#include "base/files/scoped_temp_dir.h"
#include "base/macros.h"
#include "base/memory/ref_counted_delete_on_sequence.h"
#include "base/memory/weak_ptr.h"
#include "base/optional.h"
#include "base/strings/string_piece.h"
#include "base/time/time.h"
#include "base/values.h"
#include "extensions/browser/crx_file_info.h"
#include "extensions/browser/image_sanitizer.h"
#include "extensions/browser/install/crx_install_error.h"
#include "extensions/browser/json_file_sanitizer.h"
#include "extensions/common/manifest.h"
#include "services/data_decoder/public/mojom/json_parser.mojom.h"
#include "services/service_manager/public/cpp/service_filter.h"
class SkBitmap;
namespace base {
class SequencedTaskRunner;
namespace service_manager {
class Connector;
namespace extensions {
class Extension;
enum class SandboxedUnpackerFailureReason;
namespace declarative_net_request {
struct IndexAndPersistRulesResult;
class SandboxedUnpackerClient
: public base::RefCountedDeleteOnSequence<SandboxedUnpackerClient> {
// Initialize the ref-counted base to always delete on the UI thread. Note
// the constructor call must also happen on the UI thread.
// temp_dir - A temporary directory containing the results of the extension
// unpacking. The client is responsible for deleting this directory.
// extension_root - The path to the extension root inside of temp_dir.
// original_manifest - The parsed but unmodified version of the manifest,
// with no modifications such as localization, etc.
// extension - The extension that was unpacked. The client is responsible
// for deleting this memory.
// install_icon - The icon we will display in the installation UI, if any.
// dnr_ruleset_checksum - Checksum for the indexed ruleset corresponding to
// the Declarative Net Request API. Optional since it's only valid for
// extensions which provide a declarative ruleset.
// Note: OnUnpackSuccess/Failure may be called either synchronously or
// asynchronously from SandboxedUnpacker::StartWithCrx/Directory.
virtual void OnUnpackSuccess(
const base::FilePath& temp_dir,
const base::FilePath& extension_root,
std::unique_ptr<base::DictionaryValue> original_manifest,
const Extension* extension,
const SkBitmap& install_icon,
const base::Optional<int>& dnr_ruleset_checksum) = 0;
virtual void OnUnpackFailure(const CrxInstallError& error) = 0;
friend class base::RefCountedDeleteOnSequence<SandboxedUnpackerClient>;
friend class base::DeleteHelper<SandboxedUnpackerClient>;
virtual ~SandboxedUnpackerClient() = default;
// SandboxedUnpacker does work to optionally unpack and then validate/sanitize
// an extension, either starting from a crx file, or else an already unzipped
// directory (eg., from a differential update). The parsing of complex data
// formats like JPEG or JSON is performed in specific, sandboxed services.
// Unpacking an extension using this class makes changes to its source, such as
// transcoding all images to PNG, parsing all message catalogs, and rewriting
// the manifest JSON. As such, it should not be used when the output is not
// intended to be given back to the author.
// Lifetime management:
// This class is ref-counted by each call it makes to itself on another thread.
// Additionally, we hold a reference to our own client so that the client lives
// long enough to receive the result of unpacking.
// NOTE: This class should only be used on the FILE thread.
class SandboxedUnpacker : public base::RefCountedThreadSafe<SandboxedUnpacker> {
// Creates a SandboxedUnpacker that will do work to unpack an extension,
// passing the |location| and |creation_flags| to Extension::Create. The
// |extensions_dir| parameter should specify the directory under which we'll
// create a subdirectory to write the unpacked extension contents.
// |connector| must be a fresh connector (not yet associated to any thread) to
// the service manager.
// Note: Because this requires disk I/O, the task runner passed should use
// TaskShutdownBehavior::SKIP_ON_SHUTDOWN to ensure that either the task is
// fully run (if initiated before shutdown) or not run at all (if shutdown is
// initiated first). See
// TODO(devlin): We should probably just have SandboxedUnpacker use the common
// ExtensionFileTaskRunner, and not pass in a separate one.
// TODO(devlin): SKIP_ON_SHUTDOWN is also not quite sufficient for this. We
// should probably instead be using base::ImportantFileWriter or similar.
std::unique_ptr<service_manager::Connector> connector,
Manifest::Location location,
int creation_flags,
const base::FilePath& extensions_dir,
const scoped_refptr<base::SequencedTaskRunner>& unpacker_io_task_runner,
SandboxedUnpackerClient* client);
// Start processing the extension, either from a CRX file or already unzipped
// in a directory. The client is called with the results. The directory form
// requires the id and base64-encoded public key (for insertion into the
// 'key' field of the manifest.json file).
void StartWithCrx(const CRXFileInfo& crx_info);
void StartWithDirectory(const std::string& extension_id,
const std::string& public_key_base64,
const base::FilePath& directory);
friend class base::RefCountedThreadSafe<SandboxedUnpacker>;
friend class SandboxedUnpackerTest;
// Create |temp_dir_| used to unzip or unpack the extension in.
bool CreateTempDirectory();
// Helper functions to simplify calling ReportFailure.
base::string16 FailureReasonToString16(
const SandboxedUnpackerFailureReason reason);
void FailWithPackageError(const SandboxedUnpackerFailureReason reason);
// Validates the signature of the extension and extract the key to
// |public_key_|. True if the signature validates, false otherwise.
bool ValidateSignature(const base::FilePath& crx_path,
const std::string& expected_hash);
// Unzips the extension into directory.
void Unzip(const base::FilePath& crx_path,
const base::FilePath& unzipped_dir);
void UnzipDone(const base::FilePath& zip_file,
const base::FilePath& unzip_dir,
const std::string& error);
// Unpacks the extension in directory and returns the manifest.
void Unpack(const base::FilePath& directory);
void ReadManifestDone(base::Optional<base::Value> manifest,
const base::Optional<std::string>& error);
void UnpackExtensionSucceeded(
std::unique_ptr<base::DictionaryValue> manifest);
// Helper which calls ReportFailure.
void ReportUnpackExtensionFailed(base::StringPiece error);
void ImageSanitizationDone(std::unique_ptr<base::DictionaryValue> manifest,
ImageSanitizer::Status status,
const base::FilePath& path);
void ImageSanitizerDecodedImage(const base::FilePath& path, SkBitmap image);
void ReadMessageCatalogs(std::unique_ptr<base::DictionaryValue> manifest);
void SanitizeMessageCatalogs(
std::unique_ptr<base::DictionaryValue> manifest,
const std::set<base::FilePath>& message_catalog_paths);
void MessageCatalogsSanitized(std::unique_ptr<base::DictionaryValue> manifest,
JsonFileSanitizer::Status status,
const std::string& error_msg);
// Reports unpack success or failure, or unzip failure.
void ReportSuccess(std::unique_ptr<base::DictionaryValue> original_manifest,
const base::Optional<int>& dnr_ruleset_checksum);
// Puts a sanboxed unpacker failure in histogram
// Extensions.SandboxUnpackFailureReason.
void ReportFailure(const SandboxedUnpackerFailureReason reason,
const base::string16& error);
// Overwrites original manifest with safe result from utility process.
// Returns NULL on error. Caller owns the returned object.
base::DictionaryValue* RewriteManifestFile(
const base::DictionaryValue& manifest);
// Cleans up temp directory artifacts.
void Cleanup();
// If a Declarative Net Request JSON ruleset is present, parses the JSON
// ruleset for the Declarative Net Request API and persists the indexed
// ruleset.
void IndexAndPersistJSONRulesetIfNeeded(
std::unique_ptr<base::DictionaryValue> manifest);
void OnJSONRulesetIndexed(
std::unique_ptr<base::DictionaryValue> manifest,
declarative_net_request::IndexAndPersistRulesResult result);
// Returns a JsonParser that can be used on the |unpacker_io_task_runner|.
data_decoder::mojom::JsonParser* GetJsonParserPtr();
// Parses the JSON file at |path| and invokes |callback| when done. |callback|
// is called with a null parameter if parsing failed.
// This must be called from the |unpacker_io_task_runner_|.
void ParseJsonFile(const base::FilePath& path,
data_decoder::mojom::JsonParser::ParseCallback callback);
// Connector to the ServiceManager required by the Unzip API.
std::unique_ptr<service_manager::Connector> connector_;
// If we unpacked a CRX file, we hold on to the path name for use
// in various histograms.
base::FilePath crx_path_for_histograms_;
// Our unpacker client.
scoped_refptr<SandboxedUnpackerClient> client_;
// The Extensions directory inside the profile.
base::FilePath extensions_dir_;
// Temporary directory to use for unpacking.
base::ScopedTempDir temp_dir_;
// Root directory of the unpacked extension (a child of temp_dir_).
base::FilePath extension_root_;
// Represents the extension we're unpacking.
scoped_refptr<Extension> extension_;
// The public key that was extracted from the CRX header.
std::string public_key_;
// The extension's ID. This will be calculated from the public key
// in the CRX header.
std::string extension_id_;
// If we unpacked a CRX file, the time at which unpacking started.
// Used to compute the time unpacking takes.
base::TimeTicks crx_unpack_start_time_;
// Location to use for the unpacked extension.
Manifest::Location location_;
// Creation flags to use for the extension. These flags will be used
// when calling Extension::Create() by the CRX installer.
int creation_flags_;
// Sequenced task runner where file I/O operations will be performed.
scoped_refptr<base::SequencedTaskRunner> unpacker_io_task_runner_;
// The normalized path of the install icon path, retrieved from the manifest.
base::FilePath install_icon_path_;
// The decoded install icon.
SkBitmap install_icon_;
// The ServiceFilter used to connect to the data decoder service. It is unique
// to this SandboxedUnpacker instance so that data decoder operations for
// unpacking this extension share the same process, and so that no unrelated
// data decoder operation use that process.
const service_manager::ServiceFilter data_decoder_service_filter_;
// The JSONParser interface pointer from the data decoder service.
data_decoder::mojom::JsonParserPtr json_parser_ptr_;
// The ImageSanitizer used to clean-up images.
std::unique_ptr<ImageSanitizer> image_sanitizer_;
// Used during the message catalog rewriting phase to sanitize the extension
// provided message catalogs.
std::unique_ptr<JsonFileSanitizer> json_file_sanitizer_;
} // namespace extensions