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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdint.h>
#include <memory>
#include <string_view>
#include <utility>
#include "base/command_line.h"
#include "base/containers/span.h"
#include "base/functional/bind.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/shared_memory_mapping.h"
#include "base/memory/unsafe_shared_memory_region.h"
#include "base/memory/writable_shared_memory_region.h"
#include "base/run_loop.h"
#include "base/test/bind.h"
#include "build/build_config.h"
#include "content/browser/service_host/utility_process_host.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/content_browser_test.h"
#include "content/public/test/test_service.mojom.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "sandbox/policy/mojom/sandbox.mojom.h"
#include "sandbox/policy/sandbox.h"
#include "sandbox/policy/sandbox_type.h"
#include "sandbox/policy/switches.h"
#include "services/service_manager/public/cpp/interface_provider.h"
namespace content {
namespace {
const std::string kTestMessage = "My hovercraft is full of eels!";
class MojoSandboxTest : public ContentBrowserTest {
public:
MojoSandboxTest() = default;
MojoSandboxTest(const MojoSandboxTest&) = delete;
MojoSandboxTest& operator=(const MojoSandboxTest&) = delete;
using BeforeStartCallback = base::OnceCallback<void(UtilityProcessHost&)>;
mojo::Remote<mojom::TestService> StartProcessAndBindTestInterface(
bool unsandboxed = false) {
UtilityProcessHost::Options options;
options.WithMetricsName("mojo_sandbox_test_process");
if (unsandboxed) {
options.WithSandboxType(sandbox::mojom::Sandbox::kNoSandbox);
}
mojo::Remote<mojom::TestService> test_service;
options.WithBoundServiceInterfaceOnChildProcess(
test_service.BindNewPipeAndPassReceiver());
UtilityProcessHost::Start(std::move(options));
return test_service;
}
};
// Ensures that a read-only shared memory region can be created within a
// sandboxed process.
IN_PROC_BROWSER_TEST_F(MojoSandboxTest, SubprocessReadOnlySharedMemoryRegion) {
mojo::Remote<mojom::TestService> test_service =
StartProcessAndBindTestInterface();
bool got_response = false;
base::RunLoop run_loop;
test_service.set_disconnect_handler(run_loop.QuitClosure());
test_service->CreateReadOnlySharedMemoryRegion(
kTestMessage,
base::BindLambdaForTesting([&](base::ReadOnlySharedMemoryRegion region) {
got_response = true;
ASSERT_TRUE(region.IsValid());
base::ReadOnlySharedMemoryMapping mapping = region.Map();
ASSERT_TRUE(mapping.IsValid());
auto span = mapping.GetMemoryAsSpan<const char>();
EXPECT_EQ(kTestMessage, std::string_view(span.data(), span.size()));
run_loop.Quit();
}));
run_loop.Run();
EXPECT_TRUE(got_response);
}
// Ensures that a writable shared memory region can be created within a
// sandboxed process.
IN_PROC_BROWSER_TEST_F(MojoSandboxTest, SubprocessWritableSharedMemoryRegion) {
mojo::Remote<mojom::TestService> test_service =
StartProcessAndBindTestInterface();
bool got_response = false;
base::RunLoop run_loop;
test_service.set_disconnect_handler(run_loop.QuitClosure());
test_service->CreateWritableSharedMemoryRegion(
kTestMessage,
base::BindLambdaForTesting([&](base::WritableSharedMemoryRegion region) {
got_response = true;
ASSERT_TRUE(region.IsValid());
base::WritableSharedMemoryMapping mapping = region.Map();
ASSERT_TRUE(mapping.IsValid());
auto span = mapping.GetMemoryAsSpan<const char>();
EXPECT_EQ(kTestMessage, std::string_view(span.data(), span.size()));
run_loop.Quit();
}));
run_loop.Run();
EXPECT_TRUE(got_response);
}
// Ensures that an unsafe shared memory region can be created within a
// sandboxed process.
IN_PROC_BROWSER_TEST_F(MojoSandboxTest, SubprocessUnsafeSharedMemoryRegion) {
mojo::Remote<mojom::TestService> test_service =
StartProcessAndBindTestInterface();
bool got_response = false;
base::RunLoop run_loop;
test_service.set_disconnect_handler(run_loop.QuitClosure());
test_service->CreateUnsafeSharedMemoryRegion(
kTestMessage,
base::BindLambdaForTesting([&](base::UnsafeSharedMemoryRegion region) {
got_response = true;
ASSERT_TRUE(region.IsValid());
base::WritableSharedMemoryMapping mapping = region.Map();
ASSERT_TRUE(mapping.IsValid());
auto span = mapping.GetMemoryAsSpan<const char>();
EXPECT_EQ(kTestMessage, std::string_view(span.data(), span.size()));
run_loop.Quit();
}));
run_loop.Run();
EXPECT_TRUE(got_response);
}
// Test for sandbox::policy::IsProcessSandboxed().
IN_PROC_BROWSER_TEST_F(MojoSandboxTest, IsProcessSandboxed) {
mojo::Remote<mojom::TestService> test_service =
StartProcessAndBindTestInterface();
// The browser should not be considered sandboxed.
EXPECT_FALSE(sandbox::policy::Sandbox::IsProcessSandboxed());
std::optional<bool> maybe_is_sandboxed;
base::RunLoop run_loop;
test_service.set_disconnect_handler(run_loop.QuitClosure());
test_service->IsProcessSandboxed(
base::BindLambdaForTesting([&](bool is_sandboxed) {
maybe_is_sandboxed = is_sandboxed;
run_loop.Quit();
}));
run_loop.Run();
ASSERT_TRUE(maybe_is_sandboxed.has_value());
EXPECT_TRUE(maybe_is_sandboxed.value());
}
// TODO(crbug.com/40126761): There is currently no way to know whether a
// child process is sandboxed or not on Fuchsia.
#if BUILDFLAG(IS_FUCHSIA)
#define MAYBE_NotIsProcessSandboxed DISABLED_NotIsProcessSandboxed
#else
#define MAYBE_NotIsProcessSandboxed NotIsProcessSandboxed
#endif
IN_PROC_BROWSER_TEST_F(MojoSandboxTest, MAYBE_NotIsProcessSandboxed) {
mojo::Remote<mojom::TestService> test_service =
StartProcessAndBindTestInterface(/*unsandboxed=*/true);
// The browser should not be considered sandboxed.
EXPECT_FALSE(sandbox::policy::Sandbox::IsProcessSandboxed());
std::optional<bool> maybe_is_sandboxed;
base::RunLoop run_loop;
test_service.set_disconnect_handler(run_loop.QuitClosure());
test_service->IsProcessSandboxed(
base::BindLambdaForTesting([&](bool is_sandboxed) {
maybe_is_sandboxed = is_sandboxed;
run_loop.Quit();
}));
run_loop.Run();
ASSERT_TRUE(maybe_is_sandboxed.has_value());
// If the content_browsertests is launched with --no-sandbox, that will
// get passed down to the browser and all child processes. In that case,
// IsProcessSandboxed() will report true, per the API.
bool no_sandbox = base::CommandLine::ForCurrentProcess()->HasSwitch(
sandbox::policy::switches::kNoSandbox);
EXPECT_EQ(no_sandbox, maybe_is_sandboxed.value());
}
} // namespace
} // namespace content
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