135 lines
4.5 KiB
C++
135 lines
4.5 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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// A demo sandbox for the custom_fork_bin binary.
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// Use: custom_fork_sandbox --logtostderr
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#include <syscall.h>
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#include <cstdint>
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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/log/check.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/log.h"
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#include "absl/base/log_severity.h"
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#include "absl/time/time.h"
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#include "sandboxed_api/config.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/fork_client.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/util/runfiles.h"
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std::unique_ptr<sandbox2::Policy> GetPolicy() {
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return sandbox2::PolicyBuilder()
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.AllowRead()
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.AllowWrite()
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.AllowExit()
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.AllowTime()
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.AllowSyscalls({
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__NR_close, __NR_getpid,
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#if defined(__NR_arch_prctl)
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// Not defined with every CPU architecture in prod.
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__NR_arch_prctl,
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#endif
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})
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.AllowLlvmSanitizers() // Will be a no-op when not using sanitizers.
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.BuildOrDie();
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}
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static int SandboxIteration(sandbox2::ForkClient* fork_client, int32_t i) {
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// Now, start the sandboxee as usual, just use a different Executor
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// constructor, which takes pointer to the ForkClient.
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auto executor = std::make_unique<sandbox2::Executor>(fork_client);
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// Set limits as usual.
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executor
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->limits()
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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 (including logs in prod, which
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// write to files STDOUT and STDERR).
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->set_rlimit_fsize(1024 /* bytes */)
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// The CPU time limit.
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.set_rlimit_cpu(10 /* CPU-seconds */)
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.set_walltime_limit(absl::Seconds(5));
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sandbox2::Sandbox2 s2(std::move(executor), GetPolicy());
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// Let the sandboxee run (asynchronously).
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CHECK(s2.RunAsync());
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// Send integer, which will be returned as the sandboxee's exit code.
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CHECK(s2.comms()->SendInt32(i));
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sandbox2::Result result = s2.AwaitResult();
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LOG(INFO) << "Final execution status of PID " << s2.pid() << ": "
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<< result.ToString();
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if (result.final_status() != sandbox2::Result::OK) {
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return -1;
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}
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return result.reason_code();
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}
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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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// 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 constexpr (sapi::sanitizers::IsAny()) {
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return EXIT_SUCCESS;
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}
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// Start a custom fork-server (via sandbox2::Executor).
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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/custom_fork/custom_fork_bin");
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std::vector<std::string> args = {path};
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std::vector<std::string> envs = {};
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auto fork_executor = std::make_unique<sandbox2::Executor>(path, args, envs);
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// Start the fork-server (which is here: the custom_fork_bin process calling
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// sandbox2::Client::WaitAndFork() in a loop).
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//
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// This function returns immediately, returning std::unique_ptr<ForkClient>.
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//
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// If it's holding the nullptr, then this call had failed.
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auto fork_client = fork_executor->StartForkServer();
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if (!fork_client) {
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LOG(ERROR) << "Starting custom ForkServer failed";
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return EXIT_FAILURE;
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}
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LOG(INFO) << "Custom Fork-Server started";
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// Test new sandboxees: send them integers over Comms, and expect they will
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// exit with these specific exit codes.
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for (int i = 0; i < 10; ++i) {
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CHECK_EQ(SandboxIteration(fork_client.get(), i), i);
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}
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return EXIT_SUCCESS;
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}
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