112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
/*
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* Copyright 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common/libs/security/confui_sign.h"
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#include <android-base/logging.h>
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#include "common/libs/fs/shared_buf.h"
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namespace cuttlefish {
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bool ConfUiSignerImpl::Send(SharedFD output,
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const confui::SignMessageError error,
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const std::vector<std::uint8_t>& payload) {
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#define SET_FLAG_AND_RETURN_SEND \
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sign_status_ |= kIoError; \
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return false
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// this looks redudant but makes sure that the byte-length of
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// the error is guaranteed to be the same when it is received
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confui::SignRawMessage msg;
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msg.error_ = error;
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auto n_written_err = WriteAllBinary(output, &(msg.error_));
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if (n_written_err != sizeof(msg.error_)) {
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sign_status_ |= kIoError;
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SET_FLAG_AND_RETURN_SEND;
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}
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decltype(msg.payload_.size()) payload_size = payload.size();
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auto n_written_payload_size = WriteAllBinary(output, &payload_size);
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if (n_written_payload_size != sizeof(payload_size)) {
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SET_FLAG_AND_RETURN_SEND;
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}
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const char* buf = reinterpret_cast<const char*>(payload.data());
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auto n_written_payload = WriteAll(output, buf, payload.size());
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if (n_written_payload != payload.size()) {
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SET_FLAG_AND_RETURN_SEND;
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}
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return true;
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}
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std::optional<confui::SignRawMessage> ConfUiSignerImpl::Receive(
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SharedFD input) {
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confui::SignRawMessage msg;
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auto n_read = ReadExactBinary(input, &(msg.error_));
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if (n_read != sizeof(msg.error_)) {
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sign_status_ |= kIoError;
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}
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if (msg.error_ != confui::SignMessageError::kOk) {
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sign_status_ |= kLogicError;
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}
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if (!IsOk()) {
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return std::nullopt;
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}
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decltype(msg.payload_.size()) payload_size = 0;
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n_read = ReadExactBinary(input, &payload_size);
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if (n_read != sizeof(payload_size)) {
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sign_status_ |= kIoError;
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return std::nullopt;
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}
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std::vector<std::uint8_t> buffer(payload_size);
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char* buf_data = reinterpret_cast<char*>(buffer.data());
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n_read = ReadExact(input, buf_data, payload_size);
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if (n_read != payload_size) {
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sign_status_ |= kIoError;
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return std::nullopt;
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}
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msg.payload_.swap(buffer);
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return {msg};
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}
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std::optional<confui::SignRawMessage> ConfUiSignSender::Receive() {
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return impl_.Receive(server_fd_);
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}
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bool ConfUiSignSender::Send(const SignMessageError error,
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const std::vector<std::uint8_t>& encoded_hmac) {
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if (!impl_.IsOk()) {
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return false;
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}
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impl_.Send(server_fd_, error, encoded_hmac);
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return impl_.IsOk();
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}
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bool ConfUiSignRequester::Request(const std::vector<std::uint8_t>& message) {
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impl_.Send(client_fd_, confui::SignMessageError::kOk, message);
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return impl_.IsOk();
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}
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std::optional<confui::SignRawMessage> ConfUiSignRequester::Receive() {
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if (!impl_.IsOk()) {
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return std::nullopt;
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}
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return impl_.Receive(client_fd_);
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}
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} // namespace cuttlefish
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