135 lines
4.2 KiB
C++
135 lines
4.2 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 <fcntl.h>
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#include <syscall.h>
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#include <unistd.h>
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#include <cerrno>
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#include <cstdlib>
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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/flags/flag.h"
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#include "absl/flags/parse.h"
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#include "absl/log/globals.h"
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#include "absl/log/initialize.h"
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#include "absl/log/check.h"
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#include "absl/log/log.h"
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#include "absl/base/log_severity.h"
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#include "absl/strings/string_view.h"
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#include "absl/time/time.h"
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#include "sandboxed_api/sandbox2/executor.h"
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#include "sandboxed_api/sandbox2/limits.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/result.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/util/runfiles.h"
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ABSL_FLAG(std::string, input, "", "Input file");
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ABSL_FLAG(std::string, output, "", "Output file");
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ABSL_FLAG(bool, decompress, false, "Decompress instead of compress.");
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namespace {
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std::unique_ptr<sandbox2::Policy> GetPolicy() {
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return sandbox2::PolicyBuilder()
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// Allow read on STDIN.
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.AddPolicyOnSyscall(__NR_read, {ARG_32(0), JEQ32(0, ALLOW)})
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// Allow write on STDOUT / STDERR.
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.AddPolicyOnSyscall(__NR_write,
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{ARG_32(0), JEQ32(1, ALLOW), JEQ32(2, ALLOW)})
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.AllowStat()
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.AllowStaticStartup()
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.AllowSystemMalloc()
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.AllowExit()
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.BlockSyscallsWithErrno(
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{
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#ifdef __NR_access
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__NR_access,
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#endif
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__NR_faccessat,
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},
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ENOENT)
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.BuildOrDie();
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}
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} // namespace
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int main(int argc, char* argv[]) {
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absl::SetStderrThreshold(absl::LogSeverityAtLeast::kInfo);
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absl::ParseCommandLine(argc, argv);
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absl::InitializeLog();
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if (absl::GetFlag(FLAGS_input).empty()) {
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LOG(ERROR) << "Parameter --input required.";
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return 1;
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}
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if (absl::GetFlag(FLAGS_output).empty()) {
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LOG(ERROR) << "Parameter --output required.";
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return 1;
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}
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// Note: In your own code, use sapi::GetDataDependencyFilePath() instead.
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const std::string path = sapi::internal::GetSapiDataDependencyFilePath(
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"sandbox2/examples/zlib/zpipe");
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std::vector<std::string> args = {path};
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if (absl::GetFlag(FLAGS_decompress)) {
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args.push_back("-d");
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}
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std::vector<std::string> envs = {};
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auto executor = std::make_unique<sandbox2::Executor>(path, args, envs);
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executor
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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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->limits()
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->set_rlimit_fsize(1ULL << 30) // 1GiB
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.set_rlimit_cpu(60) // The CPU time limit in seconds.
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.set_walltime_limit(absl::Seconds(5));
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// Create input + output FD.
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int fd_in = open(absl::GetFlag(FLAGS_input).c_str(), O_RDONLY);
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int fd_out = open(absl::GetFlag(FLAGS_output).c_str(),
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O_WRONLY | O_CREAT | O_TRUNC, 0644);
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CHECK_GE(fd_in, 0);
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CHECK_GE(fd_out, 0);
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executor->ipc()->MapFd(fd_in, STDIN_FILENO);
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executor->ipc()->MapFd(fd_out, STDOUT_FILENO);
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auto policy = GetPolicy();
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sandbox2::Sandbox2 s2(std::move(executor), std::move(policy));
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// Let the sandboxee run.
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auto result = s2.Run();
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close(fd_in);
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close(fd_out);
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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 2; // 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 3; // 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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