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https://github.com/google/sandboxed-api.git
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d17482e2eb
Created documentation for network proxy. fixed 2 things in documentation (namespaces are enabled by default for a while). PiperOrigin-RevId: 300321016 Change-Id: Id9c54b29551e8d3b70e814e2fdbfee594126aa90
189 lines
5.3 KiB
C++
189 lines
5.3 KiB
C++
// A demo sandbox for the network binary.
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#include <arpa/inet.h>
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#include <linux/filter.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <sys/resource.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <syscall.h>
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#include <cstdio>
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#include <cstdlib>
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#include <string>
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#include <vector>
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#include <glog/logging.h>
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#include "sandboxed_api/util/flag.h"
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#include "sandboxed_api/sandbox2/comms.h"
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#include "sandboxed_api/sandbox2/executor.h"
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#include "sandboxed_api/sandbox2/ipc.h"
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#include "sandboxed_api/sandbox2/policy.h"
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#include "sandboxed_api/sandbox2/policybuilder.h"
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#include "sandboxed_api/sandbox2/sandbox2.h"
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#include "sandboxed_api/sandbox2/util/bpf_helper.h"
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#include "sandboxed_api/sandbox2/util/fileops.h"
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#include "sandboxed_api/sandbox2/util/runfiles.h"
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ABSL_FLAG(bool, connect_with_handler, true, "Connect using automatic mode.");
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namespace {
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constexpr char kSandboxeePath[] =
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"sandbox2/examples/network_proxy/networkproxy_bin";
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std::unique_ptr<sandbox2::Policy> GetPolicy(absl::string_view sandboxee_path) {
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sandbox2::PolicyBuilder policy;
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policy.AllowExit()
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.AllowMmap()
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.AllowRead()
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.AllowWrite()
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.AllowStat() // printf, puts
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.AllowOpen()
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.AllowSyscall(__NR_sendto) // send
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.AllowSyscall(__NR_lseek)
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.AllowSyscall(__NR_munmap)
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.AllowSyscall(__NR_getpid)
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.AllowTcMalloc()
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.AddLibrariesForBinary(sandboxee_path);
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if (absl::GetFlag(FLAGS_connect_with_handler)) {
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policy.AddNetworkProxyHandlerPolicy();
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} else {
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policy.AddNetworkProxyPolicy();
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}
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return policy.AllowIPv6("::1").BuildOrDie();
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}
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void Server(int port) {
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sandbox2::file_util::fileops::FDCloser s{
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socket(AF_INET6, SOCK_STREAM | SOCK_CLOEXEC, 0)};
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if (s.get() < 0) {
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PLOG(ERROR) << "socket() failed";
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return;
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}
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{
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int enable = 1;
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if (setsockopt(s.get(), SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) <
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0) {
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PLOG(ERROR) << "setsockopt(SO_REUSEADDR) failed";
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return;
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}
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}
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// Listen to localhost only.
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struct sockaddr_in6 addr = {};
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addr.sin6_family = AF_INET6;
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addr.sin6_port = htons(port);
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int err = inet_pton(AF_INET6, "::1", &addr.sin6_addr.s6_addr);
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if (err == 0) {
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LOG(ERROR) << "inet_pton() failed";
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return;
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} else if (err == -1) {
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PLOG(ERROR) << "inet_pton() failed";
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return;
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}
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if (bind(s.get(), (struct sockaddr*)&addr, sizeof(addr)) < 0) {
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PLOG(ERROR) << "bind() failed";
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return;
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}
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if (listen(s.get(), 1) < 0) {
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PLOG(ERROR) << "listen() failed";
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return;
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}
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sandbox2::file_util::fileops::FDCloser client{accept(s.get(), 0, 0)};
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if (client.get() < 0) {
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PLOG(ERROR) << "accept() failed";
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return;
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}
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const char kMsg[] = "Hello World\n";
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write(client.get(), kMsg, ABSL_ARRAYSIZE(kMsg));
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}
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} // namespace
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int main(int argc, char** argv) {
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// This test is incompatible with sanitizers.
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// The `SKIP_SANITIZERS_AND_COVERAGE` macro won't work for us here since we
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// need to return something.
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#if defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \
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defined(THREAD_SANITIZER)
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return EXIT_SUCCESS;
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#endif
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if (getenv("COVERAGE") != nullptr) {
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return EXIT_SUCCESS;
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}
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gflags::ParseCommandLineFlags(&argc, &argv, true);
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google::InitGoogleLogging(argv[0]);
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int port = 8085;
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std::thread server_thread{Server,port};
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server_thread.detach();
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std::string path =
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sandbox2::GetInternalDataDependencyFilePath(kSandboxeePath);
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std::vector<std::string> args = {path};
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if (!absl::GetFlag(FLAGS_connect_with_handler)) {
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args.push_back("--noconnect_with_handler");
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}
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std::vector<std::string> envs = {};
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auto executor = absl::make_unique<sandbox2::Executor>(path, args, envs);
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executor
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// Sandboxing is enabled by the binary itself (i.e. the networkproxy_bin
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// is capable of enabling sandboxing on its own).
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->set_enable_sandbox_before_exec(false)
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// Set cwd to / to get rids of warnings connected with file namespace.
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.set_cwd("/");
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executor
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->limits()
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// Remove restrictions on the size of address-space of sandboxed
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// processes.
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->set_rlimit_as(RLIM64_INFINITY)
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// Kill sandboxed processes with a signal (SIGXFSZ) if it writes more than
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// these many bytes to the file-system.
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.set_rlimit_fsize(10000)
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// The CPU time limit in seconds.
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.set_rlimit_cpu(100)
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.set_walltime_limit(absl::Seconds(100));
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auto policy = GetPolicy(path);
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sandbox2::Sandbox2 s2(std::move(executor), std::move(policy));
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auto* comms = s2.comms();
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// Let the sandboxee run.
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if (!s2.RunAsync()) {
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auto result = s2.AwaitResult();
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LOG(ERROR) << "RunAsync failed: " << result.ToString();
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return 2;
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}
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// Send the port number via comms
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if (!comms->SendInt32(port)) {
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LOG(ERROR) << "sandboxee_comms->SendInt32() failed";
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return 3;
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}
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auto result = s2.AwaitResult();
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if (result.final_status() != sandbox2::Result::OK) {
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LOG(ERROR) << "Sandbox error: " << result.ToString();
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return 4; // e.g. sandbox violation, signal (sigsegv)
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}
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auto code = result.reason_code();
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if (code) {
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LOG(ERROR) << "Sandboxee exited with non-zero: " << code;
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return 5; // e.g. normal child error
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}
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LOG(INFO) << "Sandboxee finished: " << result.ToString();
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return EXIT_SUCCESS;
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}
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