mirror of
https://github.com/google/sandboxed-api.git
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142 lines
4.6 KiB
C++
142 lines
4.6 KiB
C++
// Copyright 2019 Google LLC. All Rights Reserved.
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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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// http://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 "sandboxed_api/sandbox2/sanitizer.h"
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#include <fcntl.h>
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#include <linux/fs.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <cstdlib>
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#include <utility>
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#include <vector>
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#include <glog/logging.h>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/memory/memory.h"
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#include "absl/strings/numbers.h"
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#include "absl/strings/str_cat.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/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/testing.h"
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#include "sandboxed_api/sandbox2/util.h"
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#include "sandboxed_api/sandbox2/util/bpf_helper.h"
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#include "sandboxed_api/util/status_matchers.h"
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using ::testing::Eq;
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using ::testing::Gt;
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using ::testing::IsFalse;
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using ::testing::IsTrue;
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using ::testing::Ne;
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namespace sandbox2 {
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namespace {
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// Runs a new process and returns 0 if the process terminated with 0.
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int RunTestcase(const std::string& path, const std::vector<std::string>& args) {
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pid_t pid = fork();
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if (pid < 0) {
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PLOG(ERROR) << "fork()";
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return 1;
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}
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if (pid == 0) {
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const char** argv = util::VecStringToCharPtrArr(args);
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execv(path.c_str(), const_cast<char**>(argv));
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PLOG(ERROR) << "execv('" << path << "')";
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exit(EXIT_FAILURE);
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}
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for (;;) {
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int status;
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while (wait4(pid, &status, __WALL, nullptr) != pid) {
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}
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if (WIFEXITED(status)) {
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return WEXITSTATUS(status);
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}
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if (WIFSIGNALED(status)) {
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LOG(ERROR) << "PID: " << pid << " signaled with: " << WTERMSIG(status);
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return 128 + WTERMSIG(status);
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}
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}
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}
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// Test that marking file descriptors as close-on-exec works.
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TEST(SanitizerTest, TestMarkFDsAsCOE) {
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// Open a few file descriptors in non-close-on-exec mode.
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int sock_fd[2];
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ASSERT_THAT(socketpair(AF_UNIX, SOCK_STREAM, 0, sock_fd), Ne(-1));
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ASSERT_THAT(open("/dev/full", O_RDONLY), Ne(-1));
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int null_fd = open("/dev/null", O_RDWR);
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ASSERT_THAT(null_fd, Ne(-1));
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const std::set<int> exceptions = {STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO,
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null_fd};
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ASSERT_THAT(sanitizer::MarkAllFDsAsCOEExcept(exceptions), IsTrue());
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const std::string path = GetTestSourcePath("sandbox2/testcases/sanitizer");
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std::vector<std::string> args;
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for (auto fd : exceptions) {
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args.push_back(absl::StrCat(fd));
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}
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ASSERT_THAT(RunTestcase(path, args), Eq(0));
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}
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// Test that default sanitizer leaves only 0/1/2 and 1023 (client comms FD)
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// open but closes the rest.
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TEST(SanitizerTest, TestSandboxedBinary) {
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SKIP_SANITIZERS_AND_COVERAGE;
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// Open a few file descriptors in non-close-on-exec mode.
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int sock_fd[2];
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ASSERT_THAT(socketpair(AF_UNIX, SOCK_STREAM, 0, sock_fd), Ne(-1));
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ASSERT_THAT(open("/dev/full", O_RDONLY), Ne(-1));
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ASSERT_THAT(open("/dev/null", O_RDWR), Ne(-1));
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const std::string path = GetTestSourcePath("sandbox2/testcases/sanitizer");
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std::vector<std::string> args = {
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absl::StrCat(STDIN_FILENO),
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absl::StrCat(STDOUT_FILENO),
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absl::StrCat(STDERR_FILENO),
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absl::StrCat(Comms::kSandbox2ClientCommsFD),
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};
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auto executor = absl::make_unique<Executor>(path, args);
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SAPI_ASSERT_OK_AND_ASSIGN(auto policy, PolicyBuilder()
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.DisableNamespaces()
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// Don't restrict the syscalls at all.
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.DangerDefaultAllowAll()
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.TryBuild());
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Sandbox2 s2(std::move(executor), std::move(policy));
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auto result = s2.Run();
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EXPECT_THAT(result.final_status(), Eq(Result::OK));
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EXPECT_THAT(result.reason_code(), Eq(0));
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}
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TEST(SanitizerTest, TestGetProcStatusLine) {
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// Test indirectly, GetNumberOfThreads() looks for the "Threads" value.
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EXPECT_THAT(sanitizer::GetNumberOfThreads(getpid()), Gt(0));
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}
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} // namespace
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} // namespace sandbox2
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