256 lines
9.1 KiB
C++
256 lines
9.1 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 "sandboxed_api/sandbox2/namespace.h"
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#include <unistd.h>
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#include <cstdint>
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#include <initializer_list>
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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 "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/log/check.h"
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#include "absl/status/statusor.h"
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#include "absl/strings/str_cat.h"
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#include "absl/strings/string_view.h"
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#include "sandboxed_api/config.h"
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#include "sandboxed_api/sandbox2/allow_all_syscalls.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/testing.h"
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#include "sandboxed_api/util/fileops.h"
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#include "sandboxed_api/util/status_matchers.h"
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#include "sandboxed_api/util/temp_file.h"
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namespace sandbox2 {
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namespace {
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namespace file_util = ::sapi::file_util;
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using ::sapi::CreateDefaultPermissiveTestPolicy;
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using ::sapi::CreateNamedTempFile;
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using ::sapi::GetTestSourcePath;
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using ::sapi::GetTestTempPath;
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using ::testing::Contains;
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using ::testing::ElementsAre;
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using ::testing::Eq;
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using ::testing::Gt;
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using ::testing::HasSubstr;
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using ::testing::IsEmpty;
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using ::testing::Ne;
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using ::testing::SizeIs;
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using ::testing::StartsWith;
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using ::testing::StrEq; // sapi::google3-only(broken matchers)
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std::string GetTestcaseBinPath(absl::string_view bin_name) {
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return GetTestSourcePath(absl::StrCat("sandbox2/testcases/", bin_name));
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}
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std::vector<std::string> RunSandboxeeWithArgsAndPolicy(
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const std::string& bin_path, std::initializer_list<std::string> args,
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std::unique_ptr<Policy> policy = nullptr) {
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if (!policy) {
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policy = CreateDefaultPermissiveTestPolicy(bin_path).BuildOrDie();
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}
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Sandbox2 sandbox(std::make_unique<Executor>(bin_path, args),
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std::move(policy));
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CHECK(sandbox.RunAsync());
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Comms* comms = sandbox.comms();
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uint64_t num;
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std::vector<std::string> entries;
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if (comms->RecvUint64(&num)) {
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entries.reserve(num);
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for (int i = 0; i < num; ++i) {
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std::string entry;
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CHECK(comms->RecvString(&entry));
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entries.push_back(std::move(entry));
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}
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}
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Result result = sandbox.AwaitResult();
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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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return entries;
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}
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TEST(NamespaceTest, FileNamespaceWorks) {
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// Mount /binary_path RO and check that it exists and is readable.
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// /etc/passwd should not exist.
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const std::string path = GetTestcaseBinPath("namespace");
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SAPI_ASSERT_OK_AND_ASSIGN(auto policy, CreateDefaultPermissiveTestPolicy(path)
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.AddFileAt(path, "/binary_path")
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.TryBuild());
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std::vector<std::string> result = RunSandboxeeWithArgsAndPolicy(
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path, {path, "0", "/binary_path", "/etc/passwd"}, std::move(policy));
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EXPECT_THAT(result, ElementsAre("/binary_path"));
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}
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TEST(NamespaceTest, ReadOnlyIsRespected) {
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// Mount temporary file as RO and check that it actually is RO.
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auto [name, fd] = CreateNamedTempFile(GetTestTempPath("temp_file")).value();
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file_util::fileops::FDCloser temp_closer(fd);
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const std::string path = GetTestcaseBinPath("namespace");
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{
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SAPI_ASSERT_OK_AND_ASSIGN(auto policy,
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CreateDefaultPermissiveTestPolicy(path)
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.AddFileAt(name, "/temp_file")
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.TryBuild());
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// Check that it is readable
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std::vector<std::string> result = RunSandboxeeWithArgsAndPolicy(
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path, {path, "0", "/temp_file"}, std::move(policy));
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EXPECT_THAT(result, ElementsAre("/temp_file"));
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}
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{
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SAPI_ASSERT_OK_AND_ASSIGN(auto policy,
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CreateDefaultPermissiveTestPolicy(path)
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.AddFileAt(name, "/temp_file")
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.TryBuild());
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// Now check that it is not writeable
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std::vector<std::string> result = RunSandboxeeWithArgsAndPolicy(
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path, {path, "1", "/temp_file"}, std::move(policy));
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EXPECT_THAT(result, IsEmpty());
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}
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}
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TEST(NamespaceTest, UserNamespaceWorks) {
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const std::string path = GetTestcaseBinPath("namespace");
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// Check that getpid() returns 2 (which is the case inside pid NS).
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{
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std::vector<std::string> result =
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RunSandboxeeWithArgsAndPolicy(path, {path, "2"});
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EXPECT_THAT(result, ElementsAre("2"));
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}
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// Validate that getpid() does not return 2 when outside of a pid NS.
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{
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std::vector<std::string> result = RunSandboxeeWithArgsAndPolicy(
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path, {path, "2"},
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PolicyBuilder()
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.DisableNamespaces()
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.DefaultAction(AllowAllSyscalls()) // Do not restrict syscalls
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.BuildOrDie());
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EXPECT_THAT(result, ElementsAre(Ne("2")));
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}
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}
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TEST(NamespaceTest, UserNamespaceIDMapWritten) {
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// Check that the idmap is initialized before the sandbox application is
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// started.
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const std::string path = GetTestcaseBinPath("namespace");
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{
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std::vector<std::string> result =
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RunSandboxeeWithArgsAndPolicy(path, {path, "3", "1000", "1000"});
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EXPECT_THAT(result, ElementsAre("1000", "1000"));
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}
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// Check that the uid/gid is the same when not using namespaces.
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{
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std::vector<std::string> result = RunSandboxeeWithArgsAndPolicy(
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path, {path, "3"},
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PolicyBuilder()
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.DisableNamespaces()
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.DefaultAction(AllowAllSyscalls()) // Do not restrict syscalls
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.BuildOrDie());
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EXPECT_THAT(result,
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ElementsAre(absl::StrCat(getuid()), absl::StrCat(getgid())));
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}
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}
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TEST(NamespaceTest, RootReadOnly) {
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// Mount rw tmpfs at /tmp and check it is RW.
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// Check also that / is RO.
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const std::string path = GetTestcaseBinPath("namespace");
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SAPI_ASSERT_OK_AND_ASSIGN(
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auto policy, CreateDefaultPermissiveTestPolicy(path)
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.AddTmpfs("/tmp", /*size=*/4ULL << 20 /* 4 MiB */)
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.TryBuild());
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std::vector<std::string> result = RunSandboxeeWithArgsAndPolicy(
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path, {path, "4", "/tmp/testfile", "/testfile"}, std::move(policy));
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EXPECT_THAT(result, ElementsAre("/tmp/testfile"));
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}
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TEST(NamespaceTest, RootWritable) {
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// Mount root rw and check it
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const std::string path = GetTestcaseBinPath("namespace");
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SAPI_ASSERT_OK_AND_ASSIGN(
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auto policy,
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CreateDefaultPermissiveTestPolicy(path).SetRootWritable().TryBuild());
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std::vector<std::string> result = RunSandboxeeWithArgsAndPolicy(
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path, {path, "4", "/testfile"}, std::move(policy));
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EXPECT_THAT(result, ElementsAre("/testfile"));
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}
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TEST(NamespaceTest, HostnameNone) {
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const std::string path = GetTestcaseBinPath("namespace");
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std::vector<std::string> result = RunSandboxeeWithArgsAndPolicy(
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path, {path, "7"},
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PolicyBuilder()
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.DisableNamespaces()
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.DefaultAction(AllowAllSyscalls()) // Do not restrict syscalls
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.BuildOrDie());
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EXPECT_THAT(result, ElementsAre(Ne("sandbox2")));
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}
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TEST(NamespaceTest, HostnameDefault) {
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const std::string path = GetTestcaseBinPath("namespace");
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std::vector<std::string> result =
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RunSandboxeeWithArgsAndPolicy(path, {path, "7"});
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EXPECT_THAT(result, ElementsAre("sandbox2"));
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}
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TEST(NamespaceTest, HostnameConfigured) {
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const std::string path = GetTestcaseBinPath("namespace");
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SAPI_ASSERT_OK_AND_ASSIGN(auto policy, CreateDefaultPermissiveTestPolicy(path)
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.SetHostname("configured")
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.TryBuild());
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std::vector<std::string> result =
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RunSandboxeeWithArgsAndPolicy(path, {path, "7"}, std::move(policy));
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EXPECT_THAT(result, ElementsAre("configured"));
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}
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TEST(NamespaceTest, TestInterfacesNoNetwork) {
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const std::string path = GetTestcaseBinPath("namespace");
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std::vector<std::string> result =
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RunSandboxeeWithArgsAndPolicy(path, {path, "5"});
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// Only loopback network interface 'lo'.
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EXPECT_THAT(result, ElementsAre("lo"));
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}
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TEST(NamespaceTest, TestInterfacesWithNetwork) {
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const std::string path = GetTestcaseBinPath("namespace");
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SAPI_ASSERT_OK_AND_ASSIGN(auto policy, CreateDefaultPermissiveTestPolicy(path)
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.AllowUnrestrictedNetworking()
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.TryBuild());
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std::vector<std::string> result =
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RunSandboxeeWithArgsAndPolicy(path, {path, "5"}, std::move(policy));
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// Loopback network interface 'lo' and more.
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EXPECT_THAT(result, Contains("lo"));
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EXPECT_THAT(result, SizeIs(Gt(1)));
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}
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} // namespace
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} // namespace sandbox2
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