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// Copyright 2014 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 "chromeos/dbus/easy_unlock_client.h"
#include <stddef.h>
#include <stdint.h>
#include <vector>
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_path.h"
#include "dbus/object_proxy.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace chromeos {
namespace {
// Reads array of bytes from a dbus message reader and converts it to string.
std::string PopResponseData(dbus::MessageReader* reader) {
const uint8_t* bytes = NULL;
size_t length = 0;
if (!reader->PopArrayOfBytes(&bytes, &length))
return "";
return std::string(reinterpret_cast<const char*>(bytes), length);
}
// Converts string to array of bytes and writes it using dbus meddage writer.
void AppendStringAsByteArray(const std::string& data,
dbus::MessageWriter* writer) {
writer->AppendArrayOfBytes(reinterpret_cast<const uint8_t*>(data.data()),
data.length());
}
// The EasyUnlockClient used in production (and returned by
// EasyUnlockClient::Create).
class EasyUnlockClientImpl : public EasyUnlockClient {
public:
EasyUnlockClientImpl() : proxy_(NULL), weak_ptr_factory_(this) {}
~EasyUnlockClientImpl() override {}
// EasyUnlockClient override.
void GenerateEcP256KeyPair(const KeyPairCallback& callback) override {
dbus::MethodCall method_call(
easy_unlock::kEasyUnlockServiceInterface,
easy_unlock::kGenerateEcP256KeyPairMethod);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&EasyUnlockClientImpl::OnKeyPair,
weak_ptr_factory_.GetWeakPtr(),
callback));
}
// EasyUnlockClient override.
void WrapPublicKey(const std::string& key_algorithm,
const std::string& public_key,
const DataCallback& callback) override {
dbus::MethodCall method_call(
easy_unlock::kEasyUnlockServiceInterface,
easy_unlock::kWrapPublicKeyMethod);
dbus::MessageWriter writer(&method_call);
writer.AppendString(key_algorithm);
AppendStringAsByteArray(public_key, &writer);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&EasyUnlockClientImpl::OnData,
weak_ptr_factory_.GetWeakPtr(),
callback));
}
// EasyUnlockClient override.
void PerformECDHKeyAgreement(const std::string& private_key,
const std::string& public_key,
const DataCallback& callback) override {
dbus::MethodCall method_call(
easy_unlock::kEasyUnlockServiceInterface,
easy_unlock::kPerformECDHKeyAgreementMethod);
dbus::MessageWriter writer(&method_call);
// NOTE: DBus expects that data sent as string is UTF-8 encoded. This is
// not guaranteed here, so the method uses byte arrays.
AppendStringAsByteArray(private_key, &writer);
AppendStringAsByteArray(public_key, &writer);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&EasyUnlockClientImpl::OnData,
weak_ptr_factory_.GetWeakPtr(),
callback));
}
// EasyUnlockClient override.
void CreateSecureMessage(const std::string& payload,
const CreateSecureMessageOptions& options,
const DataCallback& callback) override {
dbus::MethodCall method_call(
easy_unlock::kEasyUnlockServiceInterface,
easy_unlock::kCreateSecureMessageMethod);
dbus::MessageWriter writer(&method_call);
// NOTE: DBus expects that data sent as string is UTF-8 encoded. This is
// not guaranteed here, so the method uses byte arrays.
AppendStringAsByteArray(payload, &writer);
AppendStringAsByteArray(options.key, &writer);
AppendStringAsByteArray(options.associated_data, &writer);
AppendStringAsByteArray(options.public_metadata, &writer);
AppendStringAsByteArray(options.verification_key_id, &writer);
AppendStringAsByteArray(options.decryption_key_id, &writer);
writer.AppendString(options.encryption_type);
writer.AppendString(options.signature_type);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&EasyUnlockClientImpl::OnData,
weak_ptr_factory_.GetWeakPtr(),
callback));
}
// EasyUnlockClient override.
void UnwrapSecureMessage(const std::string& message,
const UnwrapSecureMessageOptions& options,
const DataCallback& callback) override {
dbus::MethodCall method_call(
easy_unlock::kEasyUnlockServiceInterface,
easy_unlock::kUnwrapSecureMessageMethod);
dbus::MessageWriter writer(&method_call);
// NOTE: DBus expects that data sent as string is UTF-8 encoded. This is
// not guaranteed here, so the method uses byte arrays.
AppendStringAsByteArray(message, &writer);
AppendStringAsByteArray(options.key, &writer);
AppendStringAsByteArray(options.associated_data, &writer);
writer.AppendString(options.encryption_type);
writer.AppendString(options.signature_type);
proxy_->CallMethod(&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&EasyUnlockClientImpl::OnData,
weak_ptr_factory_.GetWeakPtr(),
callback));
}
protected:
void Init(dbus::Bus* bus) override {
proxy_ =
bus->GetObjectProxy(
easy_unlock::kEasyUnlockServiceName,
dbus::ObjectPath(easy_unlock::kEasyUnlockServicePath));
}
private:
void OnData(const DataCallback& callback, dbus::Response* response) {
if (!response) {
callback.Run("");
return;
}
dbus::MessageReader reader(response);
callback.Run(PopResponseData(&reader));
}
void OnKeyPair(const KeyPairCallback& callback, dbus::Response* response) {
if (!response) {
callback.Run("", "");
return;
}
dbus::MessageReader reader(response);
std::string private_key = PopResponseData(&reader);
std::string public_key = PopResponseData(&reader);
if (public_key.empty() || private_key.empty()) {
callback.Run("", "");
return;
}
callback.Run(private_key, public_key);
}
dbus::ObjectProxy* proxy_;
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<EasyUnlockClientImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(EasyUnlockClientImpl);
};
} // namespace
EasyUnlockClient::CreateSecureMessageOptions::CreateSecureMessageOptions() {}
EasyUnlockClient::CreateSecureMessageOptions::~CreateSecureMessageOptions() {}
EasyUnlockClient::UnwrapSecureMessageOptions::UnwrapSecureMessageOptions() {}
EasyUnlockClient::UnwrapSecureMessageOptions::~UnwrapSecureMessageOptions() {}
EasyUnlockClient::EasyUnlockClient() {
}
EasyUnlockClient::~EasyUnlockClient() {
}
// static
EasyUnlockClient* EasyUnlockClient::Create() {
return new EasyUnlockClientImpl();
}
} // namespace chromeos
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