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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sandbox/mac/seatbelt.h"
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <unistd.h>
#include <iterator>
#include <optional>
#include "base/containers/span.h"
#include "base/files/file.h"
#include "base/files/scoped_temp_dir.h"
#include "base/mac/mac_util.h"
#include "base/posix/eintr_wrapper.h"
#include "base/strings/string_number_conversions.h"
#include "base/test/multiprocess_test.h"
#include "base/test/test_timeouts.h"
#include "sandbox/mac/sandbox_test.h"
#include "sandbox/mac/seatbelt.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "testing/multiprocess_func_list.h"
namespace sandbox {
using SeatbeltTest = SandboxTest;
MULTIPROCESS_TEST_MAIN(SandboxCheckTestProcess) {
CHECK(!Seatbelt::IsSandboxed());
const char* profile =
"(version 1)"
"(deny default (with no-log))";
std::string error;
CHECK(Seatbelt::Init(profile, 0, &error));
CHECK(Seatbelt::IsSandboxed());
return 0;
}
TEST_F(SeatbeltTest, SandboxCheckTest) {
base::Process process = SpawnChild("SandboxCheckTestProcess");
ASSERT_TRUE(process.IsValid());
int exit_code = 42;
EXPECT_TRUE(process.WaitForExitWithTimeout(TestTimeouts::action_max_timeout(),
&exit_code));
EXPECT_EQ(exit_code, 0);
}
MULTIPROCESS_TEST_MAIN(Ftruncate) {
const char* profile =
"(version 1)"
"(deny default (with no-log))";
std::string error;
CHECK(Seatbelt::Init(profile, 0, &error)) << error;
std::unique_ptr<base::Environment> env = base::Environment::Create();
std::optional<std::string> fd_string = env->GetVar("FD_TO_TRUNCATE");
CHECK(fd_string.has_value());
int fd;
CHECK(base::StringToInt(*fd_string, &fd));
const char kTestBuf[] = "hello";
CHECK_EQ(static_cast<ssize_t>(strlen(kTestBuf)),
HANDLE_EINTR(write(fd, kTestBuf, strlen(kTestBuf))));
return ftruncate(fd, 0) == 0 ? 0 : 15;
}
// Tests ftruncate() behavior on an inherited, open, writable FD. Prior to macOS
// 10.15, the sandbox did not permit ftruncate on such FDs, but now it does.
// This verifies the new behavior. See https://crbug.com/1084565 for details.
TEST_F(SeatbeltTest, Ftruncate) {
base::ScopedTempDir temp_dir;
ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
base::File file(
temp_dir.GetPath().Append("file.txt"),
base::File::FLAG_CREATE | base::File::FLAG_READ | base::File::FLAG_WRITE);
ASSERT_TRUE(file.IsValid());
const std::string contents =
"Wouldn't it be nice to be able to use ftruncate?\n";
EXPECT_TRUE(file.WriteAtCurrentPosAndCheck(base::as_byte_span(contents)));
EXPECT_EQ(static_cast<int64_t>(contents.length()), file.GetLength());
base::PlatformFile fd = file.GetPlatformFile();
base::LaunchOptions options;
options.fds_to_remap.emplace_back(fd, fd);
options.environment["FD_TO_TRUNCATE"] = base::NumberToString(fd);
base::Process process = SpawnChildWithOptions("Ftruncate", options);
ASSERT_TRUE(process.IsValid());
int exit_code = 42;
EXPECT_TRUE(process.WaitForExitWithTimeout(TestTimeouts::action_max_timeout(),
&exit_code));
EXPECT_EQ(0, exit_code);
EXPECT_EQ(0, file.GetLength());
}
MULTIPROCESS_TEST_MAIN(ProcessSelfInfo) {
const char* profile = R"(
(version 1)
(deny default (with no-log))
; `process-info` is default-allowed.
(deny process-info*)
(allow process-info-pidinfo (target self))
(deny sysctl-read)
)";
std::string error;
CHECK(Seatbelt::Init(profile, 0, &error)) << error;
std::array<int, 4> mib = {CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid()};
kinfo_proc proc;
size_t size = sizeof(proc);
int rv = sysctl(mib.data(), mib.size(), &proc, &size, nullptr, 0);
PCHECK(rv == 0);
mib.back() = getppid();
errno = 0;
rv = sysctl(mib.data(), mib.size(), &proc, &size, nullptr, 0);
PCHECK(rv == -1);
PCHECK(errno == EPERM);
return 0;
}
TEST_F(SeatbeltTest, ProcessSelfInfo) {
base::Process process = SpawnChild("ProcessSelfInfo");
ASSERT_TRUE(process.IsValid());
int exit_code = 42;
EXPECT_TRUE(process.WaitForExitWithTimeout(TestTimeouts::action_max_timeout(),
&exit_code));
EXPECT_EQ(exit_code, 0);
}
} // namespace sandbox
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