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// Copyright 2016 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 <stdint.h>
#include <memory>
#include <utility>
#include "base/bind.h"
#include "base/command_line.h"
#include "base/containers/span.h"
#include "base/macros.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/strings/string_piece.h"
#include "base/test/bind.h"
#include "build/build_config.h"
#include "content/browser/utility_process_host.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/common/content_features.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/sandbox.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;
using BeforeStartCallback = base::OnceCallback<void(UtilityProcessHost*)>;
scoped_refptr<base::SingleThreadTaskRunner> GetProcessTaskRunner() {
return base::FeatureList::IsEnabled(features::kProcessHostOnUI)
? GetUIThreadTaskRunner({})
: GetIOThreadTaskRunner({});
}
void StartProcess(BeforeStartCallback callback = BeforeStartCallback()) {
base::RunLoop run_loop;
GetProcessTaskRunner()->PostTaskAndReply(
FROM_HERE,
base::BindOnce(&MojoSandboxTest::StartUtilityProcessOnIoThread,
base::Unretained(this), std::move(callback)),
run_loop.QuitClosure());
run_loop.Run();
}
mojo::Remote<mojom::TestService> BindTestService() {
mojo::Remote<mojom::TestService> test_service;
GetProcessTaskRunner()->PostTask(
FROM_HERE, base::BindOnce(&MojoSandboxTest::BindTestServiceOnIoThread,
base::Unretained(this),
test_service.BindNewPipeAndPassReceiver()));
return test_service;
}
void TearDownOnMainThread() override {
base::RunLoop run_loop;
GetProcessTaskRunner()->PostTaskAndReply(
FROM_HERE,
base::BindOnce(&MojoSandboxTest::StopUtilityProcessOnIoThread,
base::Unretained(this)),
run_loop.QuitClosure());
run_loop.Run();
}
protected:
std::unique_ptr<UtilityProcessHost> host_;
private:
void StartUtilityProcessOnIoThread(BeforeStartCallback callback) {
host_ = std::make_unique<UtilityProcessHost>();
host_->SetMetricsName("mojo_sandbox_test_process");
if (callback)
std::move(callback).Run(host_.get());
ASSERT_TRUE(host_->Start());
}
void BindTestServiceOnIoThread(
mojo::PendingReceiver<mojom::TestService> receiver) {
host_->GetChildProcess()->BindReceiver(std::move(receiver));
}
void StopUtilityProcessOnIoThread() { host_.reset(); }
DISALLOW_COPY_AND_ASSIGN(MojoSandboxTest);
};
// Ensures that a read-only shared memory region can be created within a
// sandboxed process.
IN_PROC_BROWSER_TEST_F(MojoSandboxTest, SubprocessReadOnlySharedMemoryRegion) {
StartProcess();
mojo::Remote<mojom::TestService> test_service = BindTestService();
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, base::StringPiece(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) {
StartProcess();
mojo::Remote<mojom::TestService> test_service = BindTestService();
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, base::StringPiece(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) {
StartProcess();
mojo::Remote<mojom::TestService> test_service = BindTestService();
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, base::StringPiece(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) {
StartProcess();
mojo::Remote<mojom::TestService> test_service = BindTestService();
// The browser should not be considered sandboxed.
EXPECT_FALSE(sandbox::policy::Sandbox::IsProcessSandboxed());
absl::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());
}
IN_PROC_BROWSER_TEST_F(MojoSandboxTest, NotIsProcessSandboxed) {
StartProcess(base::BindOnce([](UtilityProcessHost* host) {
host->SetSandboxType(sandbox::policy::SandboxType::kNoSandbox);
}));
mojo::Remote<mojom::TestService> test_service = BindTestService();
// The browser should not be considered sandboxed.
EXPECT_FALSE(sandbox::policy::Sandbox::IsProcessSandboxed());
absl::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 defined(OS_ANDROID)
// Android does not support unsandboxed utility processes. See
// org.chromium.content.browser.ChildProcessLauncherHelperImpl#createAndStart
EXPECT_TRUE(maybe_is_sandboxed.value());
#else
// 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());
#endif
}
} // namespace
} // namespace content
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