sandboxed-api/sandboxed_api/sandbox2/sandbox2_test.cc

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// Copyright 2019 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.
#include "sandboxed_api/sandbox2/sandbox2.h"
#include <fcntl.h>
#include <syscall.h>
#include <csignal>
#include <memory>
#include <string>
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
#include "absl/strings/str_cat.h"
#include "sandboxed_api/config.h"
#include "sandboxed_api/sandbox2/executor.h"
#include "sandboxed_api/sandbox2/policy.h"
#include "sandboxed_api/sandbox2/policybuilder.h"
#include "sandboxed_api/sandbox2/result.h"
#include "sandboxed_api/sandbox2/util/bpf_helper.h"
#include "sandboxed_api/testing.h"
#include "sandboxed_api/util/status_matchers.h"
namespace sandbox2 {
namespace {
using ::sapi::GetTestSourcePath;
using ::testing::Eq;
using ::testing::HasSubstr;
using ::testing::IsEmpty;
using ::testing::IsTrue;
using ::testing::Lt;
// Test that aborting inside a sandbox with all userspace core dumping
// disabled reports the signal.
TEST(SandboxCoreDumpTest, AbortWithoutCoreDumpReturnsSignaled) {
SKIP_SANITIZERS_AND_COVERAGE;
const std::string path = GetTestSourcePath("sandbox2/testcases/abort");
std::vector<std::string> args = {
path,
};
auto executor = absl::make_unique<Executor>(path, args);
SAPI_ASSERT_OK_AND_ASSIGN(auto policy,
PolicyBuilder()
.DisableNamespaces()
// Don't restrict the syscalls at all.
.DangerDefaultAllowAll()
.TryBuild());
Sandbox2 sandbox(std::move(executor), std::move(policy));
auto result = sandbox.Run();
ASSERT_THAT(result.final_status(), Eq(Result::SIGNALED));
EXPECT_THAT(result.reason_code(), Eq(SIGABRT));
}
// Test that with TSYNC we are able to sandbox when multithreaded and with no
// memory checks. If TSYNC is not supported, then no.
TEST(TsyncTest, TsyncNoMemoryChecks) {
SKIP_SANITIZERS_AND_COVERAGE;
const std::string path = GetTestSourcePath("sandbox2/testcases/tsync");
std::vector<std::string> args = {path};
auto executor = absl::make_unique<Executor>(path, args);
executor->set_enable_sandbox_before_exec(false);
SAPI_ASSERT_OK_AND_ASSIGN(auto policy,
PolicyBuilder()
.DisableNamespaces()
// Don't restrict the syscalls at all.
.DangerDefaultAllowAll()
.TryBuild());
Sandbox2 sandbox(std::move(executor), std::move(policy));
auto result = sandbox.Run();
// With TSYNC, SandboxMeHere should be able to sandbox when multithreaded.
ASSERT_EQ(result.final_status(), Result::OK);
ASSERT_EQ(result.reason_code(), 0);
}
// Tests whether Executor(fd, args, envp) constructor works as
// expected.
TEST(ExecutorTest, ExecutorFdConstructor) {
SKIP_SANITIZERS_AND_COVERAGE;
const std::string path = GetTestSourcePath("sandbox2/testcases/minimal");
int fd = open(path.c_str(), O_RDONLY);
ASSERT_NE(fd, -1);
std::vector<std::string> args = {absl::StrCat("FD:", fd)};
std::vector<std::string> envs;
auto executor = absl::make_unique<Executor>(fd, args, envs);
SAPI_ASSERT_OK_AND_ASSIGN(auto policy,
PolicyBuilder()
.DisableNamespaces()
// Don't restrict the syscalls at all.
.DangerDefaultAllowAll()
.TryBuild());
Sandbox2 sandbox(std::move(executor), std::move(policy));
auto result = sandbox.Run();
ASSERT_EQ(result.final_status(), Result::OK);
}
TEST(StackTraceTest, StackTraceOnExitWorks) {
SKIP_SANITIZERS_AND_COVERAGE;
const std::string path = GetTestSourcePath("sandbox2/testcases/minimal");
std::vector<std::string> args = {path};
auto executor = absl::make_unique<Executor>(path, args);
SAPI_ASSERT_OK_AND_ASSIGN(auto policy,
PolicyBuilder()
// Don't restrict the syscalls at all.
.DangerDefaultAllowAll()
.CollectStacktracesOnExit(true)
.TryBuild());
Sandbox2 sandbox(std::move(executor), std::move(policy));
auto result = sandbox.Run();
ASSERT_EQ(result.final_status(), Result::OK);
ASSERT_THAT(result.stack_trace(), Not(IsEmpty()));
}
// Tests that we return the correct state when the sandboxee was killed by an
// external signal. Also make sure that we do not have the stack trace.
TEST(RunAsyncTest, SandboxeeExternalKill) {
const std::string path = GetTestSourcePath("sandbox2/testcases/sleep");
std::vector<std::string> args = {path};
std::vector<std::string> envs;
auto executor = absl::make_unique<Executor>(path, args, envs);
SAPI_ASSERT_OK_AND_ASSIGN(auto policy,
PolicyBuilder()
// Don't restrict the syscalls at all.
.DangerDefaultAllowAll()
.TryBuild());
Sandbox2 sandbox(std::move(executor), std::move(policy));
ASSERT_TRUE(sandbox.RunAsync());
sleep(1);
sandbox.Kill();
auto result = sandbox.AwaitResult();
EXPECT_EQ(result.final_status(), Result::EXTERNAL_KILL);
EXPECT_THAT(result.GetStackTrace(), IsEmpty());
}
// Tests that we return the correct state when the sandboxee timed out.
TEST(RunAsyncTest, SandboxeeTimeoutWithStacktraces) {
const std::string path = GetTestSourcePath("sandbox2/testcases/sleep");
std::vector<std::string> args = {path};
std::vector<std::string> envs;
auto executor = absl::make_unique<Executor>(path, args, envs);
SAPI_ASSERT_OK_AND_ASSIGN(auto policy,
PolicyBuilder()
// Don't restrict the syscalls at all.
.DangerDefaultAllowAll()
.TryBuild());
Sandbox2 sandbox(std::move(executor), std::move(policy));
ASSERT_TRUE(sandbox.RunAsync());
sandbox.set_walltime_limit(absl::Seconds(1));
auto result = sandbox.AwaitResult();
EXPECT_EQ(result.final_status(), Result::TIMEOUT);
EXPECT_THAT(result.GetStackTrace(), HasSubstr("sleep"));
}
// Tests that we do not collect stack traces if it was disabled (signaled).
TEST(RunAsyncTest, SandboxeeTimeoutDisabledStacktraces) {
const std::string path = GetTestSourcePath("sandbox2/testcases/sleep");
std::vector<std::string> args = {path};
std::vector<std::string> envs;
auto executor = absl::make_unique<Executor>(path, args, envs);
SAPI_ASSERT_OK_AND_ASSIGN(auto policy,
PolicyBuilder()
// Don't restrict the syscalls at all.
.DangerDefaultAllowAll()
.CollectStacktracesOnTimeout(false)
.TryBuild());
Sandbox2 sandbox(std::move(executor), std::move(policy));
ASSERT_TRUE(sandbox.RunAsync());
sandbox.set_walltime_limit(absl::Seconds(1));
auto result = sandbox.AwaitResult();
EXPECT_EQ(result.final_status(), Result::TIMEOUT);
EXPECT_THAT(result.GetStackTrace(), IsEmpty());
}
// Tests that we do not collect stack traces if it was disabled (violation).
TEST(RunAsyncTest, SandboxeeViolationDisabledStacktraces) {
const std::string path = GetTestSourcePath("sandbox2/testcases/sleep");
std::vector<std::string> args = {path};
std::vector<std::string> envs;
auto executor = absl::make_unique<Executor>(path, args, envs);
SAPI_ASSERT_OK_AND_ASSIGN(
auto policy, PolicyBuilder()
// Don't allow anything - Make sure that we'll crash.
.CollectStacktracesOnViolation(false)
.TryBuild());
Sandbox2 sandbox(std::move(executor), std::move(policy));
ASSERT_TRUE(sandbox.RunAsync());
auto result = sandbox.AwaitResult();
EXPECT_EQ(result.final_status(), Result::VIOLATION);
EXPECT_THAT(result.GetStackTrace(), IsEmpty());
}
TEST(StarvationTest, MonitorIsNotStarvedByTheSandboxee) {
const std::string path = GetTestSourcePath("sandbox2/testcases/starve");
std::vector<std::string> args = {path};
std::vector<std::string> envs;
auto executor = absl::make_unique<Executor>(path, args, envs);
SAPI_ASSERT_OK_AND_ASSIGN(
auto policy,
PolicyBuilder().DisableNamespaces().DangerDefaultAllowAll().TryBuild());
executor->limits()->set_walltime_limit(absl::Seconds(5));
Sandbox2 sandbox(std::move(executor), std::move(policy));
auto start = absl::Now();
ASSERT_THAT(sandbox.RunAsync(), IsTrue());
auto result = sandbox.AwaitResult();
EXPECT_THAT(result.final_status(), Eq(Result::TIMEOUT));
auto end = absl::Now();
auto elapsed = end - start;
EXPECT_THAT(elapsed, Lt(absl::Seconds(10)));
}
} // namespace
} // namespace sandbox2