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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/mac/seatbelt_extension.h"
#include <unistd.h>
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/files/scoped_temp_dir.h"
#include "base/stl_util.h"
#include "base/test/multiprocess_test.h"
#include "base/test/test_timeouts.h"
#include "sandbox/mac/sandbox_compiler.h"
#include "sandbox/mac/seatbelt_extension_token.h"
#include "testing/multiprocess_func_list.h"
namespace sandbox {
namespace {
const char kSandboxProfile[] =
"(version 1)\n"
"(deny default (with no-log))\n"
"(allow file-read* (extension \"com.apple.app-sandbox.read\"))";
const char kTestData[] = "hello world";
constexpr int kTestDataLen = base::size(kTestData);
const char kSwitchFile[] = "test-file";
const char kSwitchExtension[] = "test-extension";
class SeatbeltExtensionTest : public base::MultiProcessTest {
public:
void SetUp() override {
ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
file_path_ = temp_dir_.GetPath().AppendASCII("sbox.test");
ASSERT_EQ(kTestDataLen,
base::WriteFile(file_path_, kTestData, kTestDataLen));
}
base::FilePath file_path() { return file_path_; }
private:
base::ScopedTempDir temp_dir_;
base::FilePath file_path_;
};
TEST_F(SeatbeltExtensionTest, FileReadAccess) {
base::CommandLine command_line(
base::GetMultiProcessTestChildBaseCommandLine());
auto token = sandbox::SeatbeltExtension::Issue(
sandbox::SeatbeltExtension::FILE_READ, file_path().value());
ASSERT_TRUE(token.get());
// Ensure any symlinks in the path are canonicalized.
base::FilePath path = base::MakeAbsoluteFilePath(file_path());
ASSERT_FALSE(path.empty());
command_line.AppendSwitchPath(kSwitchFile, path);
command_line.AppendSwitchASCII(kSwitchExtension, token->token());
base::Process test_child = base::SpawnMultiProcessTestChild(
"FileReadAccess", command_line, base::LaunchOptions());
int exit_code = 42;
test_child.WaitForExitWithTimeout(TestTimeouts::action_max_timeout(),
&exit_code);
EXPECT_EQ(0, exit_code);
}
MULTIPROCESS_TEST_MAIN(FileReadAccess) {
sandbox::SandboxCompiler compiler(kSandboxProfile);
std::string error;
CHECK(compiler.CompileAndApplyProfile(&error)) << error;
auto* command_line = base::CommandLine::ForCurrentProcess();
base::FilePath file_path = command_line->GetSwitchValuePath(kSwitchFile);
CHECK(!file_path.empty());
const char* path = file_path.value().c_str();
std::string token_str = command_line->GetSwitchValueASCII(kSwitchExtension);
CHECK(!token_str.empty());
auto token = sandbox::SeatbeltExtensionToken::CreateForTesting(token_str);
auto extension = sandbox::SeatbeltExtension::FromToken(std::move(token));
CHECK(extension);
CHECK(token.token().empty());
// Without consuming the extension, file access is denied.
errno = 0;
base::ScopedFD fd(open(path, O_RDONLY));
CHECK_EQ(-1, fd.get());
CHECK_EQ(EPERM, errno);
CHECK(extension->Consume());
// After consuming the extension, file access is still denied for writing.
errno = 0;
fd.reset(open(path, O_RDWR));
CHECK_EQ(-1, fd.get());
CHECK_EQ(EPERM, errno);
// ... but it is allowed to read.
errno = 0;
fd.reset(open(path, O_RDONLY));
PCHECK(fd.get() > 0);
// Close the file and revoke the extension.
fd.reset();
extension->Revoke();
// File access is denied again.
errno = 0;
fd.reset(open(path, O_RDONLY));
CHECK_EQ(-1, fd.get());
CHECK_EQ(EPERM, errno);
// Re-acquire the access by using the token, but this time consume it
// permanetly.
token = sandbox::SeatbeltExtensionToken::CreateForTesting(token_str);
extension = sandbox::SeatbeltExtension::FromToken(std::move(token));
CHECK(extension);
CHECK(extension->ConsumePermanently());
// Check that reading still works.
errno = 0;
fd.reset(open(path, O_RDONLY));
PCHECK(fd.get() > 0);
return 0;
}
} // namespace
} // namespace sandbox
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