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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "apc_compat.hpp"
#include <android-base/logging.h>
#include <android/hardware/confirmationui/1.0/IConfirmationUI.h>
#include <hwbinder/IBinder.h>
#include <memory>
#include <string>
#include <thread>
#include <vector>
#define LOG_TAG "keystore2_apc_compat"
namespace keystore2 {
using android::sp;
using android::hardware::hidl_death_recipient;
using android::hardware::hidl_vec;
using android::hardware::Return;
using android::hardware::Status;
using android::hardware::confirmationui::V1_0::IConfirmationResultCallback;
using android::hardware::confirmationui::V1_0::IConfirmationUI;
using android::hardware::confirmationui::V1_0::ResponseCode;
using android::hardware::confirmationui::V1_0::UIOption;
static uint32_t responseCode2Compat(ResponseCode rc) {
switch (rc) {
case ResponseCode::OK:
return APC_COMPAT_ERROR_OK;
case ResponseCode::Canceled:
return APC_COMPAT_ERROR_CANCELLED;
case ResponseCode::Aborted:
return APC_COMPAT_ERROR_ABORTED;
case ResponseCode::OperationPending:
return APC_COMPAT_ERROR_OPERATION_PENDING;
case ResponseCode::Ignored:
return APC_COMPAT_ERROR_IGNORED;
case ResponseCode::SystemError:
case ResponseCode::Unimplemented:
case ResponseCode::Unexpected:
case ResponseCode::UIError:
case ResponseCode::UIErrorMissingGlyph:
case ResponseCode::UIErrorMessageTooLong:
case ResponseCode::UIErrorMalformedUTF8Encoding:
default:
return APC_COMPAT_ERROR_SYSTEM_ERROR;
}
}
class ConfuiCompatSession : public IConfirmationResultCallback, public hidl_death_recipient {
public:
static sp<ConfuiCompatSession>* tryGetService() {
sp<IConfirmationUI> service = IConfirmationUI::tryGetService();
if (service) {
return new sp(new ConfuiCompatSession(std::move(service)));
} else {
return nullptr;
}
}
uint32_t promptUserConfirmation(ApcCompatCallback callback, const char* prompt_text,
const uint8_t* extra_data, size_t extra_data_size,
const char* locale, ApcCompatUiOptions ui_options) {
std::string hidl_prompt(prompt_text);
std::vector<uint8_t> hidl_extra(extra_data, extra_data + extra_data_size);
std::string hidl_locale(locale);
std::vector<UIOption> hidl_ui_options;
if (ui_options.inverted) {
hidl_ui_options.push_back(UIOption::AccessibilityInverted);
}
if (ui_options.magnified) {
hidl_ui_options.push_back(UIOption::AccessibilityMagnified);
}
auto lock = std::lock_guard(callback_lock_);
if (callback_.result != nullptr) {
return APC_COMPAT_ERROR_OPERATION_PENDING;
}
auto err = service_->linkToDeath(sp(this), 0);
if (!err.isOk()) {
LOG(ERROR) << "Communication error: promptUserConfirmation: "
"Trying to register death recipient: "
<< err.description();
return APC_COMPAT_ERROR_SYSTEM_ERROR;
}
auto rc = service_->promptUserConfirmation(sp(this), hidl_prompt, hidl_extra, hidl_locale,
hidl_ui_options);
if (!rc.isOk()) {
LOG(ERROR) << "Communication error: promptUserConfirmation: " << rc.description();
}
if (rc == ResponseCode::OK) {
callback_ = callback;
}
return responseCode2Compat(rc.withDefault(ResponseCode::SystemError));
}
void abort() { service_->abort(); }
void
finalize(ResponseCode responseCode,
std::optional<std::reference_wrapper<const hidl_vec<uint8_t>>> dataConfirmed,
std::optional<std::reference_wrapper<const hidl_vec<uint8_t>>> confirmationToken) {
ApcCompatCallback callback;
{
auto lock = std::lock_guard(callback_lock_);
// Calling the callback consumes the callback data structure. We have to make
// sure that it can only be called once.
callback = callback_;
callback_ = {nullptr, nullptr};
// Unlock the callback_lock_ here. It must never be held while calling the callback.
}
if (callback.result != nullptr) {
service_->unlinkToDeath(sp(this));
size_t dataConfirmedSize = 0;
const uint8_t* dataConfirmedPtr = nullptr;
size_t confirmationTokenSize = 0;
const uint8_t* confirmationTokenPtr = nullptr;
if (responseCode == ResponseCode::OK) {
if (dataConfirmed) {
dataConfirmedPtr = dataConfirmed->get().data();
dataConfirmedSize = dataConfirmed->get().size();
}
if (dataConfirmed) {
confirmationTokenPtr = confirmationToken->get().data();
confirmationTokenSize = confirmationToken->get().size();
}
}
callback.result(callback.data, responseCode2Compat(responseCode), dataConfirmedPtr,
dataConfirmedSize, confirmationTokenPtr, confirmationTokenSize);
}
}
// IConfirmationResultCallback overrides:
android::hardware::Return<void> result(ResponseCode responseCode,
const hidl_vec<uint8_t>& dataConfirmed,
const hidl_vec<uint8_t>& confirmationToken) override {
finalize(responseCode, dataConfirmed, confirmationToken);
return Status::ok();
};
void serviceDied(uint64_t /* cookie */,
const ::android::wp<::android::hidl::base::V1_0::IBase>& /* who */) override {
finalize(ResponseCode::SystemError, {}, {});
}
private:
ConfuiCompatSession(sp<IConfirmationUI> service)
: service_(service), callback_{nullptr, nullptr} {}
sp<IConfirmationUI> service_;
// The callback_lock_ protects the callback_ field against concurrent modification.
// IMPORTANT: It must never be held while calling the call back.
std::mutex callback_lock_;
ApcCompatCallback callback_;
};
} // namespace keystore2
using namespace keystore2;
ApcCompatServiceHandle tryGetUserConfirmationService() {
return reinterpret_cast<ApcCompatServiceHandle>(ConfuiCompatSession::tryGetService());
}
uint32_t promptUserConfirmation(ApcCompatServiceHandle handle, ApcCompatCallback callback,
const char* prompt_text, const uint8_t* extra_data,
size_t extra_data_size, char const* locale,
ApcCompatUiOptions ui_options) {
auto session = reinterpret_cast<sp<ConfuiCompatSession>*>(handle);
return (*session)->promptUserConfirmation(callback, prompt_text, extra_data, extra_data_size,
locale, ui_options);
}
void abortUserConfirmation(ApcCompatServiceHandle handle) {
auto session = reinterpret_cast<sp<ConfuiCompatSession>*>(handle);
(*session)->abort();
}
void closeUserConfirmationService(ApcCompatServiceHandle handle) {
// Closing the handle implicitly aborts an ongoing sessions.
// Note that a resulting callback is still safely conducted, because we only delete a
// StrongPointer below. libhwbinder still owns another StrongPointer to this session.
abortUserConfirmation(handle);
delete reinterpret_cast<sp<ConfuiCompatSession>*>(handle);
}
const ApcCompatServiceHandle INVALID_SERVICE_HANDLE = nullptr;
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