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sandboxed-api/sandboxed_api/sandbox2/mounts_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/mounts.h"
#include <unistd.h>
#include <utility>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/strings/match.h"
#include "absl/strings/str_cat.h"
#include "sandboxed_api/testing.h"
#include "sandboxed_api/util/path.h"
#include "sandboxed_api/util/status_matchers.h"
#include "sandboxed_api/util/temp_file.h"
namespace sandbox2 {
namespace {
namespace file = ::sapi::file;
using ::sapi::CreateNamedTempFileAndClose;
using ::sapi::CreateTempDir;
using ::sapi::GetTestSourcePath;
using ::sapi::GetTestTempPath;
using ::sapi::IsOk;
using ::sapi::StatusIs;
using ::testing::Eq;
using ::testing::StrEq;
using ::testing::UnorderedElementsAreArray;
constexpr size_t kTmpfsSize = 1024;
TEST(MountTreeTest, TestInvalidFilenames) {
Mounts mounts;
EXPECT_THAT(mounts.AddFile(""), StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddFile("a"),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddFileAt("/a", ""),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddFileAt("", "/a"),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddFileAt("/a", "a"),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddFile("/"),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddFileAt("/a", "/"),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.Remove("/"), StatusIs(absl::StatusCode::kInvalidArgument));
}
TEST(MountTreeTest, TestAddFile) {
Mounts mounts;
EXPECT_THAT(mounts.AddFile("/a"), IsOk());
EXPECT_THAT(mounts.AddFile("/b"), IsOk());
EXPECT_THAT(mounts.AddFile("/c/d"), IsOk());
EXPECT_THAT(mounts.AddFile("/c/e"), IsOk());
EXPECT_THAT(mounts.AddFile("/c/dd/e"), IsOk());
EXPECT_THAT(mounts.AddFileAt("/a", "/f"), IsOk());
}
TEST(MountTreeTest, TestAddDir) {
Mounts mounts;
EXPECT_THAT(mounts.AddDirectoryAt("/a", "/a"), IsOk());
EXPECT_THAT(mounts.AddDirectoryAt("/c/d", "/c/d"), IsOk());
EXPECT_THAT(mounts.AddDirectoryAt("/c/d/e", "/c/d/e"), IsOk());
}
TEST(MountTreeTest, TestAddTmpFs) {
Mounts mounts;
EXPECT_THAT(mounts.AddTmpfs("/a", kTmpfsSize), IsOk());
EXPECT_THAT(mounts.AddTmpfs("/a/b", kTmpfsSize), IsOk());
EXPECT_THAT(mounts.AddFile("/a/b/c"), IsOk());
EXPECT_THAT(mounts.AddDirectoryAt("/a/b/d", "/a/b/d"), IsOk());
}
TEST(MountTreeTest, TestRemove) {
Mounts mounts;
EXPECT_THAT(mounts.AddTmpfs("/a", kTmpfsSize), IsOk());
EXPECT_THAT(mounts.AddFile("/b/c/d"), IsOk());
EXPECT_THAT(mounts.AddFile("/c/c/d"), IsOk());
EXPECT_THAT(mounts.AddDirectoryAt("/d/b/d", "/d/b/d"), IsOk());
EXPECT_THAT(mounts.AddDirectoryAt("/e/b/d", "/e/b/d"), IsOk());
EXPECT_THAT(mounts.Remove("/a/b"), StatusIs(absl::StatusCode::kNotFound));
EXPECT_THAT(mounts.Remove("/a"), IsOk());
EXPECT_THAT(mounts.Remove("/b/c/d/e"), StatusIs(absl::StatusCode::kNotFound));
EXPECT_THAT(mounts.Remove("/b/c/e"), StatusIs(absl::StatusCode::kNotFound));
EXPECT_THAT(mounts.Remove("/b/c/d"), IsOk());
EXPECT_THAT(mounts.Remove("/c"), IsOk());
EXPECT_THAT(mounts.Remove("/d/b/d/e"), StatusIs(absl::StatusCode::kNotFound));
EXPECT_THAT(mounts.Remove("/d/b/d"), IsOk());
EXPECT_THAT(mounts.Remove("/e"), IsOk());
EXPECT_THAT(mounts.Remove("/f"), StatusIs(absl::StatusCode::kNotFound));
}
TEST(MountTreeTest, TestMultipleInsertionFileSymlink) {
Mounts mounts;
SAPI_ASSERT_OK_AND_ASSIGN(std::string path,
CreateNamedTempFileAndClose(
file::JoinPath(GetTestTempPath(), "testdir_")));
SAPI_ASSERT_OK_AND_ASSIGN(std::string symlink_path,
CreateNamedTempFileAndClose(
file::JoinPath(GetTestTempPath(), "testdir_")));
ASSERT_THAT(unlink(symlink_path.c_str()), Eq(0));
ASSERT_THAT(symlink(path.c_str(), symlink_path.c_str()), Eq(0));
EXPECT_THAT(mounts.AddFileAt(path, "/a"), IsOk());
EXPECT_THAT(mounts.AddFileAt(path, "/a"), IsOk());
EXPECT_THAT(mounts.AddFileAt(symlink_path, "/a"), IsOk());
}
TEST(MountTreeTest, TestMultipleInsertionUpgradeToWritable) {
Mounts mounts;
EXPECT_THAT(mounts.AddFile("/a"), IsOk());
EXPECT_THAT(mounts.AddFile("/a", /*is_ro=*/false), IsOk());
EXPECT_THAT(mounts.AddDirectory("/b"), IsOk());
EXPECT_THAT(mounts.AddDirectory("/b", /*is_ro=*/false), IsOk());
EXPECT_THAT(mounts.AddFile("/c", /*is_ro=*/false), IsOk());
EXPECT_THAT(mounts.AddFile("/c"), IsOk());
EXPECT_THAT(mounts.AddDirectory("/d", /*is_ro=*/false), IsOk());
EXPECT_THAT(mounts.AddDirectory("/d"), IsOk());
}
TEST(MountTreeTest, TestMultipleInsertionDirSymlink) {
Mounts mounts;
SAPI_ASSERT_OK_AND_ASSIGN(
std::string path,
CreateTempDir(file::JoinPath(GetTestTempPath(), "testdir_")));
SAPI_ASSERT_OK_AND_ASSIGN(std::string symlink_path,
CreateNamedTempFileAndClose(
file::JoinPath(GetTestTempPath(), "testdir_")));
ASSERT_THAT(unlink(symlink_path.c_str()), Eq(0));
ASSERT_THAT(symlink(path.c_str(), symlink_path.c_str()), Eq(0));
EXPECT_THAT(mounts.AddDirectoryAt(path, "/a"), IsOk());
EXPECT_THAT(mounts.AddDirectoryAt(path, "/a"), IsOk());
EXPECT_THAT(mounts.AddDirectoryAt(symlink_path, "/a"), IsOk());
EXPECT_THAT(mounts.AddDirectoryAt(symlink_path, "/a"), IsOk());
}
TEST(MountTreeTest, TestMultipleInsertion) {
Mounts mounts;
EXPECT_THAT(mounts.AddFile("/c/d"), IsOk());
EXPECT_THAT(mounts.AddFile("/c"),
StatusIs(absl::StatusCode::kFailedPrecondition));
EXPECT_THAT(mounts.AddFileAt("/f", "/c"),
StatusIs(absl::StatusCode::kFailedPrecondition));
EXPECT_THAT(mounts.AddDirectoryAt("/f", "/c"), IsOk());
EXPECT_THAT(mounts.AddFile("/c/d/e"),
StatusIs(absl::StatusCode::kFailedPrecondition));
EXPECT_THAT(mounts.AddFileAt("/f", "/c/d/e"),
StatusIs(absl::StatusCode::kFailedPrecondition));
EXPECT_THAT(mounts.AddDirectoryAt("/f", "/c/d/e"),
StatusIs(absl::StatusCode::kFailedPrecondition));
}
TEST(MountTreeTest, TestEvilNullByte) {
Mounts mounts;
// create the filename with a null byte this way as g4 fix forces newlines
// otherwise.
std::string filename = "/a/b";
filename[2] = '\0';
EXPECT_THAT(mounts.AddFile(filename),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddFileAt(filename, "/a"),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddFileAt("/a", filename),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddDirectoryAt(filename, "/a"),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddDirectoryAt("/a", filename),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.AddTmpfs(filename, kTmpfsSize),
StatusIs(absl::StatusCode::kInvalidArgument));
EXPECT_THAT(mounts.Remove(filename),
StatusIs(absl::StatusCode::kInvalidArgument));
}
TEST(MountTreeTest, TestMinimalDynamicBinary) {
Mounts mounts;
EXPECT_THAT(mounts.AddMappingsForBinary(
GetTestSourcePath("sandbox2/testcases/minimal_dynamic")),
IsOk());
EXPECT_THAT(mounts.AddFile("/lib/x86_64-linux-gnu/libc.so.6"), IsOk());
}
TEST(MountTreeTest, TestList) {
struct TestCase {
const char* path;
const bool is_ro;
};
// clang-format off
constexpr TestCase kTestCases[] = {
// NOTE: Directories have a trailing '/'; files don't.
{"/a/b", true},
{"/a/c/", true},
{"/a/c/d/e/f/g", true},
{"/h", true},
{"/i/j/k", false},
{"/i/l/", false},
};
// clang-format on
Mounts mounts;
// Create actual directories and files on disk and selectively add
for (const auto& test_case : kTestCases) {
const auto inside_path = test_case.path;
const std::string outside_path = absl::StrCat("/some/dir/", inside_path);
if (absl::EndsWith(outside_path, "/")) {
ASSERT_THAT(
mounts.AddDirectoryAt(file::CleanPath(outside_path),
file::CleanPath(inside_path), test_case.is_ro),
IsOk());
} else {
ASSERT_THAT(
mounts.AddFileAt(file::CleanPath(outside_path),
file::CleanPath(inside_path), test_case.is_ro),
IsOk());
}
}
ASSERT_THAT(mounts.AddTmpfs(file::CleanPath("/d"), 1024 * 1024), IsOk());
std::vector<std::string> outside_entries;
std::vector<std::string> inside_entries;
mounts.RecursivelyListMounts(&outside_entries, &inside_entries);
// clang-format off
EXPECT_THAT(
inside_entries,
UnorderedElementsAreArray({
"R /a/b",
"R /a/c/",
"R /a/c/d/e/f/g",
"R /h",
"W /i/j/k",
"W /i/l/",
"/d",
}));
EXPECT_THAT(
outside_entries,
UnorderedElementsAreArray({
absl::StrCat("/some/dir/", "a/b"),
absl::StrCat("/some/dir/", "a/c/"),
absl::StrCat("/some/dir/", "a/c/d/e/f/g"),
absl::StrCat("/some/dir/", "h"),
absl::StrCat("/some/dir/", "i/j/k"),
absl::StrCat("/some/dir/", "i/l/"),
absl::StrCat("tmpfs: size=", 1024*1024),
}));
// clang-format on
}
TEST(MountTreeTest, TestIsWritable) {
MountTree::Node nodes[7];
MountTree::FileNode* fn0 = nodes[0].mutable_file_node();
fn0->set_writable(false);
fn0->set_outside("foo");
MountTree::FileNode* fn1 = nodes[1].mutable_file_node();
fn1->set_writable(true);
fn1->set_outside("bar");
MountTree::DirNode* dn0 = nodes[2].mutable_dir_node();
dn0->set_writable(false);
dn0->set_outside("foo");
MountTree::DirNode* dn1 = nodes[3].mutable_dir_node();
dn1->set_writable(true);
dn1->set_outside("bar");
MountTree::RootNode* rn0 = nodes[4].mutable_root_node();
rn0->set_writable(false);
MountTree::RootNode* rn1 = nodes[5].mutable_root_node();
rn1->set_writable(true);
MountTree::TmpfsNode* tn0 = nodes[6].mutable_tmpfs_node();
tn0->set_tmpfs_options("option1");
EXPECT_FALSE(internal::IsWritable(nodes[0]));
EXPECT_TRUE(internal::IsWritable(nodes[1]));
EXPECT_FALSE(internal::IsWritable(nodes[2]));
EXPECT_TRUE(internal::IsWritable(nodes[3]));
EXPECT_FALSE(internal::IsWritable(nodes[4]));
EXPECT_TRUE(internal::IsWritable(nodes[5]));
EXPECT_FALSE(internal::IsWritable(nodes[6]));
}
TEST(MountTreeTest, TestHasSameTarget) {
MountTree::Node nodes[10];
MountTree::FileNode* fn0 = nodes[0].mutable_file_node();
fn0->set_writable(false);
fn0->set_outside("foo");
MountTree::FileNode* fn1 = nodes[1].mutable_file_node();
fn1->set_writable(true);
fn1->set_outside("foo");
MountTree::FileNode* fn2 = nodes[2].mutable_file_node();
fn2->set_writable(false);
fn2->set_outside("bar");
MountTree::DirNode* dn0 = nodes[3].mutable_dir_node();
dn0->set_writable(false);
dn0->set_outside("foo");
MountTree::DirNode* dn1 = nodes[4].mutable_dir_node();
dn1->set_writable(true);
dn1->set_outside("foo");
MountTree::DirNode* dn2 = nodes[5].mutable_dir_node();
dn2->set_writable(false);
dn2->set_outside("bar");
MountTree::TmpfsNode* tn0 = nodes[6].mutable_tmpfs_node();
tn0->set_tmpfs_options("option1");
MountTree::TmpfsNode* tn1 = nodes[7].mutable_tmpfs_node();
tn1->set_tmpfs_options("option2");
MountTree::RootNode* rn0 = nodes[8].mutable_root_node();
rn0->set_writable(false);
MountTree::RootNode* rn1 = nodes[9].mutable_root_node();
rn1->set_writable(true);
// Compare same file nodes
EXPECT_TRUE(internal::HasSameTarget(nodes[0], nodes[0]));
// Compare almost same file nodes (ro vs rw)
EXPECT_TRUE(internal::HasSameTarget(nodes[0], nodes[1]));
// Compare different file nodes
EXPECT_FALSE(internal::HasSameTarget(nodes[0], nodes[2]));
// Compare file node with dir node
EXPECT_FALSE(internal::HasSameTarget(nodes[0], nodes[3]));
// Compare same dir nodes
EXPECT_TRUE(internal::HasSameTarget(nodes[3], nodes[3]));
// Compare almost same dir nodes (ro vs rw)
EXPECT_TRUE(internal::HasSameTarget(nodes[3], nodes[4]));
// Compare different dir nodes
EXPECT_FALSE(internal::HasSameTarget(nodes[3], nodes[5]));
// Compare dir node with tmpfs node
EXPECT_FALSE(internal::HasSameTarget(nodes[3], nodes[6]));
// Compare same tmpfs nodes
EXPECT_TRUE(internal::HasSameTarget(nodes[6], nodes[6]));
// Compare different tmpfs nodes
EXPECT_FALSE(internal::HasSameTarget(nodes[6], nodes[7]));
// Compare dir node with root node
EXPECT_FALSE(internal::HasSameTarget(nodes[6], nodes[8]));
// Compare same root nodes
EXPECT_TRUE(internal::HasSameTarget(nodes[8], nodes[8]));
// Compare almost same root nodes (ro vs rw)
EXPECT_TRUE(internal::HasSameTarget(nodes[8], nodes[9]));
}
TEST(MountTreeTest, TestNodeEquivalence) {
MountTree::Node nodes[8];
MountTree::FileNode* fn0 = nodes[0].mutable_file_node();
fn0->set_writable(false);
fn0->set_outside("foo");
MountTree::FileNode* fn1 = nodes[1].mutable_file_node();
fn1->set_writable(false);
fn1->set_outside("bar");
MountTree::DirNode* dn0 = nodes[2].mutable_dir_node();
dn0->set_writable(false);
dn0->set_outside("foo");
MountTree::DirNode* dn1 = nodes[3].mutable_dir_node();
dn1->set_writable(false);
dn1->set_outside("bar");
MountTree::TmpfsNode* tn0 = nodes[4].mutable_tmpfs_node();
tn0->set_tmpfs_options("option1");
MountTree::TmpfsNode* tn1 = nodes[5].mutable_tmpfs_node();
tn1->set_tmpfs_options("option2");
MountTree::RootNode* rn0 = nodes[6].mutable_root_node();
rn0->set_writable(false);
MountTree::RootNode* rn1 = nodes[7].mutable_root_node();
rn1->set_writable(true);
for (const MountTree::Node& n : nodes) {
ASSERT_TRUE(n.IsInitialized());
}
// Compare same file nodes
EXPECT_TRUE(internal::IsEquivalentNode(nodes[0], nodes[0]));
// Compare with different file node
EXPECT_FALSE(internal::IsEquivalentNode(nodes[0], nodes[1]));
// compare file node with dir node
EXPECT_FALSE(internal::IsEquivalentNode(nodes[0], nodes[2]));
// Compare same dir nodes
EXPECT_TRUE(internal::IsEquivalentNode(nodes[2], nodes[2]));
// Compare with different dir node
EXPECT_FALSE(internal::IsEquivalentNode(nodes[2], nodes[3]));
// Compare dir node with tmpfs node
EXPECT_FALSE(internal::IsEquivalentNode(nodes[2], nodes[4]));
// Compare same tmpfs nodes
EXPECT_TRUE(internal::IsEquivalentNode(nodes[4], nodes[4]));
// Compare with different tmpfs nodes
EXPECT_FALSE(internal::IsEquivalentNode(nodes[4], nodes[5]));
// Compare tmpfs node with root node
EXPECT_FALSE(internal::IsEquivalentNode(nodes[4], nodes[6]));
// Compare same root nodes
EXPECT_TRUE(internal::IsEquivalentNode(nodes[6], nodes[6]));
// Compare different root node
EXPECT_FALSE(internal::IsEquivalentNode(nodes[6], nodes[7]));
// Compare root node with file node
EXPECT_FALSE(internal::IsEquivalentNode(nodes[6], nodes[0]));
}
TEST(MountsResolvePathTest, Files) {
Mounts mounts;
ASSERT_THAT(mounts.AddFileAt("/A", "/a"), IsOk());
ASSERT_THAT(mounts.AddFileAt("/B", "/d/b"), IsOk());
ASSERT_THAT(mounts.AddFileAt("/C/D/E", "/d/c/e/f/h"), IsOk());
std::string resolved;
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/a"));
EXPECT_THAT(resolved, StrEq("/A"));
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/d/b"));
EXPECT_THAT(resolved, StrEq("/B"));
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/d/c/e/f/h"));
EXPECT_THAT(resolved, StrEq("/C/D/E"));
ASSERT_THAT(mounts.ResolvePath("/f"), StatusIs(absl::StatusCode::kNotFound));
ASSERT_THAT(mounts.ResolvePath("/d"), StatusIs(absl::StatusCode::kNotFound));
ASSERT_THAT(mounts.ResolvePath("/d/c/e/f"),
StatusIs(absl::StatusCode::kNotFound));
ASSERT_THAT(mounts.ResolvePath("/d/d"),
StatusIs(absl::StatusCode::kNotFound));
}
TEST(MountsResolvePathTest, Dirs) {
Mounts mounts;
ASSERT_THAT(mounts.AddDirectoryAt("/A", "/a"), IsOk());
ASSERT_THAT(mounts.AddDirectoryAt("/B", "/d/b"), IsOk());
ASSERT_THAT(mounts.AddDirectoryAt("/C/D/E", "/d/c/e/f/h"), IsOk());
ASSERT_THAT(mounts.AddFileAt("/J/G/H", "/d/c/e/f/h/j"), IsOk());
ASSERT_THAT(mounts.AddDirectoryAt("/K/L/M", "/d/c/e/f/h/k"), IsOk());
std::string resolved;
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/a"));
EXPECT_THAT(resolved, StrEq("/A"));
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/a/b/c/d/e"));
EXPECT_THAT(resolved, StrEq("/A/b/c/d/e"));
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/d/b"));
EXPECT_THAT(resolved, StrEq("/B"));
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/d/c/e/f/h"));
EXPECT_THAT(resolved, StrEq("/C/D/E"));
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/d/c/e/f/h/i"));
EXPECT_THAT(resolved, StrEq("/C/D/E/i"));
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/d/c/e/f/h/j"));
EXPECT_THAT(resolved, StrEq("/J/G/H"));
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/d/c/e/f/h/k"));
EXPECT_THAT(resolved, StrEq("/K/L/M"));
SAPI_ASSERT_OK_AND_ASSIGN(resolved, mounts.ResolvePath("/d/c/e/f/h/k/a"));
EXPECT_THAT(resolved, StrEq("/K/L/M/a"));
ASSERT_THAT(mounts.ResolvePath("/f"), StatusIs(absl::StatusCode::kNotFound));
ASSERT_THAT(mounts.ResolvePath("/d"), StatusIs(absl::StatusCode::kNotFound));
ASSERT_THAT(mounts.ResolvePath("/d/c/e/f"),
StatusIs(absl::StatusCode::kNotFound));
ASSERT_THAT(mounts.ResolvePath("/d/d"),
StatusIs(absl::StatusCode::kNotFound));
}
} // namespace
} // namespace sandbox2
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