sandboxed-api/sandboxed_api/sandbox2/testcases/network_proxy.cc
Wiktor Garbacz 5f9698612e Better network proxy tests
Fix sending error on `connect` failure.

PiperOrigin-RevId: 562693682
Change-Id: I70c710a9001f22e172cbe4df328983bfa7188d3d
2023-09-05 00:57:27 -07:00

184 lines
5.4 KiB
C++

// Copyright 2023 Google LLC
//
// 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
//
// https://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.
// A binary doing various malloc calls to check that the malloc policy works as
// expected.
// This file is an example of a network sandboxed binary inside a network
// namespace. It can't connect with the server directly, but the executor can
// establish a connection and pass the connected socket to the sandboxee.
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#include <cerrno>
#include <cstdint>
#include <cstring>
#include <variant>
#include "absl/base/log_severity.h"
#include "absl/flags/flag.h"
#include "absl/flags/parse.h"
#include "absl/log/check.h"
#include "absl/log/globals.h"
#include "absl/log/initialize.h"
#include "absl/log/log.h"
#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/strings/str_format.h"
#include "absl/strings/string_view.h"
#include "sandboxed_api/sandbox2/client.h"
#include "sandboxed_api/sandbox2/comms.h"
#include "sandboxed_api/sandbox2/network_proxy/client.h"
#include "sandboxed_api/util/fileops.h"
#include "sandboxed_api/util/status_macros.h"
ABSL_FLAG(bool, connect_with_handler, true, "Connect using automatic mode.");
ABSL_FLAG(bool, ipv6, false, "Use IPv6.");
namespace {
using ::sapi::file_util::fileops::FDCloser;
struct IPAddr {
size_t GetSize() const {
return addr.index() == 0 ? sizeof(sockaddr_in) : sizeof(sockaddr_in6);
}
const sockaddr* GetPtr() const {
return addr.index() == 0
? reinterpret_cast<const sockaddr*>(&std::get<0>(addr))
: reinterpret_cast<const sockaddr*>(&std::get<1>(addr));
}
std::variant<sockaddr_in, sockaddr_in6> addr;
};
static sandbox2::NetworkProxyClient* g_proxy_client;
ssize_t ReadFromFd(int fd, uint8_t* buf, size_t size) {
ssize_t received = 0;
while (received < size) {
ssize_t read_status =
TEMP_FAILURE_RETRY(read(fd, &buf[received], size - received));
if (read_status == 0) {
break;
}
if (read_status < 0) {
return -1;
}
received += read_status;
}
return received;
}
absl::Status CommunicationTest(int sock) {
char received[1025] = {0};
if (ReadFromFd(sock, reinterpret_cast<uint8_t*>(received),
sizeof(received) - 1) <= 0) {
return absl::InternalError("Data receiving error");
}
absl::PrintF("Sandboxee received data from the server:\n\n%s\n", received);
if (strcmp(received, "Hello World\n")) {
return absl::InternalError("Data receiving error");
}
return absl::OkStatus();
}
IPAddr CreateAddress(int port) {
static struct sockaddr_in saddr4 {};
static struct sockaddr_in6 saddr6 {};
saddr4.sin_family = AF_INET;
saddr6.sin6_family = AF_INET6;
saddr4.sin_port = saddr6.sin6_port = htons(port);
PCHECK(inet_pton(AF_INET6, "::1", &saddr6.sin6_addr) == 1);
PCHECK(inet_pton(AF_INET, "127.0.0.1", &saddr4.sin_addr) == 1);
return absl::GetFlag(FLAGS_ipv6) ? IPAddr{.addr = saddr6}
: IPAddr{.addr = saddr4};
}
absl::Status ConnectWithoutHandler(int s, IPAddr saddr) {
return g_proxy_client->Connect(s, saddr.GetPtr(), saddr.GetSize());
}
absl::Status ConnectWithHandler(int s, IPAddr saddr) {
int err = connect(s, saddr.GetPtr(), saddr.GetSize());
if (err != 0) {
return absl::InternalError("connect() failed");
}
return absl::OkStatus();
}
absl::StatusOr<FDCloser> ConnectToServer(int port) {
IPAddr addr = CreateAddress(port);
FDCloser s(
socket(absl::GetFlag(FLAGS_ipv6) ? AF_INET6 : AF_INET, SOCK_STREAM, 0));
if (s.get() < 0) {
return absl::ErrnoToStatus(errno, "socket()");
}
if (absl::GetFlag(FLAGS_connect_with_handler)) {
SAPI_RETURN_IF_ERROR(ConnectWithHandler(s.get(), addr));
} else {
SAPI_RETURN_IF_ERROR(ConnectWithoutHandler(s.get(), addr));
}
LOG(INFO) << "Connected to the server";
return s;
}
} // namespace
int main(int argc, char* argv[]) {
absl::SetStderrThreshold(absl::LogSeverityAtLeast::kInfo);
absl::ParseCommandLine(argc, argv);
absl::InitializeLog();
// Set-up the sandbox2::Client object, using a file descriptor (1023).
sandbox2::Comms comms(sandbox2::Comms::kDefaultConnection);
sandbox2::Client sandbox2_client(&comms);
if (absl::GetFlag(FLAGS_connect_with_handler)) {
if (auto status = sandbox2_client.InstallNetworkProxyHandler();
!status.ok()) {
LOG(ERROR) << "InstallNetworkProxyHandler() failed: " << status;
return 1;
}
} else {
g_proxy_client = sandbox2_client.GetNetworkProxyClient();
}
// Receive port number of the server
int port;
if (!comms.RecvInt32(&port)) {
LOG(ERROR) << "Failed to receive port number";
return 2;
}
absl::StatusOr<FDCloser> client = ConnectToServer(port);
if (!client.ok()) {
LOG(ERROR) << client.status();
return 3;
}
if (auto status = CommunicationTest(client->get()); !status.ok()) {
LOG(ERROR) << status;
return 4;
}
return 0;
}