123 lines
3.3 KiB
C++
123 lines
3.3 KiB
C++
// Copyright 2019 Google LLC
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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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// https://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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#include "sandboxed_api/sandbox2/network_proxy/server.h"
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#include <netinet/in.h>
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#include <pthread.h>
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#include <signal.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <atomic>
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#include <cerrno>
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#include <memory>
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#include <string>
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#include <utility>
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#include <vector>
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#include "absl/log/log.h"
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#include "absl/status/status.h"
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#include "absl/status/statusor.h"
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#include "sandboxed_api/util/fileops.h"
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namespace sandbox2 {
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namespace file_util = ::sapi::file_util;
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NetworkProxyServer::NetworkProxyServer(int fd, AllowedHosts* allowed_hosts,
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pthread_t monitor_thread_id)
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: violation_occurred_(false),
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comms_(std::make_unique<Comms>(fd)),
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fatal_error_(false),
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monitor_thread_id_(monitor_thread_id),
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allowed_hosts_(allowed_hosts) {}
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void NetworkProxyServer::ProcessConnectRequest() {
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std::vector<uint8_t> addr;
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if (!comms_->RecvBytes(&addr)) {
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fatal_error_ = true;
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return;
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}
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const struct sockaddr* saddr = reinterpret_cast<const sockaddr*>(addr.data());
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// Only IPv4 TCP and IPv6 TCP are supported.
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if (!((addr.size() == sizeof(sockaddr_in) && saddr->sa_family == AF_INET) ||
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(addr.size() == sizeof(sockaddr_in6) &&
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saddr->sa_family == AF_INET6))) {
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SendError(EINVAL);
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return;
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}
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if (!allowed_hosts_->IsHostAllowed(saddr)) {
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NotifyViolation(saddr);
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return;
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}
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int new_socket = socket(saddr->sa_family, SOCK_STREAM, 0);
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if (new_socket < 0) {
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SendError(errno);
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return;
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}
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file_util::fileops::FDCloser new_socket_closer(new_socket);
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int result = connect(
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new_socket, reinterpret_cast<const sockaddr*>(addr.data()), addr.size());
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if (result == 0) {
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NotifySuccess();
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if (!fatal_error_) {
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if (!comms_->SendFD(new_socket)) {
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fatal_error_ = true;
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return;
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}
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}
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}
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}
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void NetworkProxyServer::Run() {
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while (!fatal_error_ &&
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!violation_occurred_.load(std::memory_order_relaxed)) {
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ProcessConnectRequest();
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}
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LOG(INFO)
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<< "Clean shutdown or error occurred, shutting down NetworkProxyServer";
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}
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void NetworkProxyServer::SendError(int saved_errno) {
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if (!comms_->SendInt32(saved_errno)) {
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fatal_error_ = true;
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}
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}
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void NetworkProxyServer::NotifySuccess() {
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if (!comms_->SendInt32(0)) {
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fatal_error_ = true;
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}
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}
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void NetworkProxyServer::NotifyViolation(const struct sockaddr* saddr) {
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if (absl::StatusOr<std::string> result = AddrToString(saddr); result.ok()) {
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violation_msg_ = std::move(result).value();
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} else {
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violation_msg_ = std::string(result.status().message());
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}
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violation_occurred_.store(true, std::memory_order_release);
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pthread_kill(monitor_thread_id_, SIGCHLD);
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}
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} // namespace sandbox2
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