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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/named_mojo_ipc_server/named_mojo_message_pipe_server.h"
#include <memory>
#include <utility>
#include "base/check.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/process/process.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/thread_pool.h"
#include "base/threading/sequence_bound.h"
#include "build/build_config.h"
#include "components/named_mojo_ipc_server/connection_info.h"
#include "components/named_mojo_ipc_server/endpoint_options.h"
#include "components/named_mojo_ipc_server/named_mojo_server_endpoint_connector.h"
#include "mojo/core/embedder/embedder.h"
#include "mojo/public/cpp/platform/platform_channel_endpoint.h"
#include "mojo/public/cpp/system/invitation.h"
#include "mojo/public/cpp/system/isolated_connection.h"
#include "mojo/public/cpp/system/message_pipe.h"
#if BUILDFLAG(IS_WIN)
#include <windows.h>
#include "base/strings/stringprintf.h"
#include "base/win/win_util.h"
#endif // BUILDFLAG(IS_WIN)
namespace named_mojo_ipc_server {
// Forwards callbacks from a NamedMojoServerEndpointConnector to a
// NamedMojoMessagePipeServer. This allows the server to create a SequenceBound
// interface to post callbacks from the IO sequence to the main sequence.
class NamedMojoMessagePipeServer::DelegateProxy final
: public NamedMojoServerEndpointConnector::Delegate {
public:
explicit DelegateProxy(base::WeakPtr<NamedMojoMessagePipeServer> server)
: server_(server) {}
~DelegateProxy() override = default;
void OnClientConnected(mojo::PlatformChannelEndpoint endpoint,
std::unique_ptr<ConnectionInfo> info) override {
if (server_) {
server_->OnClientConnected(std::move(endpoint), std::move(info));
}
}
void OnServerEndpointCreated() override {
if (server_) {
server_->OnServerEndpointCreated();
}
}
private:
base::WeakPtr<NamedMojoMessagePipeServer> server_;
};
NamedMojoMessagePipeServer::NamedMojoMessagePipeServer(
const EndpointOptions& options,
Validator validator,
OnMessagePipeReady on_message_pipe_ready)
: options_(options),
validator_(validator),
on_message_pipe_ready_(on_message_pipe_ready) {
CHECK(!options.server_name.empty());
io_sequence_ =
base::ThreadPool::CreateSequencedTaskRunner({base::MayBlock()});
}
NamedMojoMessagePipeServer::~NamedMojoMessagePipeServer() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
void NamedMojoMessagePipeServer::StartServer() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (server_started_) {
return;
}
endpoint_connector_ = NamedMojoServerEndpointConnector::Create(
io_sequence_, options_,
base::SequenceBound<DelegateProxy>(
base::SequencedTaskRunner::GetCurrentDefault(),
weak_factory_.GetWeakPtr()));
endpoint_connector_.AsyncCall(&NamedMojoServerEndpointConnector::Start);
server_started_ = true;
}
void NamedMojoMessagePipeServer::StopServer() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (!server_started_) {
return;
}
server_started_ = false;
endpoint_connector_.Reset();
}
void NamedMojoMessagePipeServer::OnClientConnected(
mojo::PlatformChannelEndpoint endpoint,
std::unique_ptr<ConnectionInfo> info) {
base::ProcessId peer_pid = info->pid;
ValidationResult result = validator_.Run(std::move(info));
if (!result.is_valid) {
LOG(ERROR) << "Process " << peer_pid
<< " is not a trusted mojo endpoint. Connection refused.";
return;
}
bool is_isolated = !options_.message_pipe_id.has_value();
base::Process peer_process;
// A peer process is not needed to open a non-MojoIpcz isolated connection,
// and in fact some callers don't have the right ACL to open the peer process
// yet, so we only open the peer process if the connection is non-isolated, or
// MojoIpcz is enabled.
if (!is_isolated || mojo::core::IsMojoIpczEnabled()) {
#if BUILDFLAG(IS_WIN)
// Open process with minimum permissions since the client process might have
// restricted its access with DACL.
peer_process = base::Process::OpenWithAccess(peer_pid, PROCESS_DUP_HANDLE);
// Windows opens the process with a system call so we use PLOG to extract more
// info. Other OSes (i.e. POSIX) don't do that.
#define INVALID_PROCESS_LOG PLOG
#else
peer_process = base::Process::Open(peer_pid);
#define INVALID_PROCESS_LOG LOG
#endif
if (!peer_process.IsValid()) {
// With MojoIpcz, connections can be made without a process handle to the
// client, as long as the client has a process handle to the server, so we
// don't return here.
INVALID_PROCESS_LOG(WARNING) << "Failed to open peer process";
}
#undef INVALID_PROCESS_LOG
}
if (is_isolated) {
// Create isolated connection.
auto connection = std::make_unique<mojo::IsolatedConnection>();
mojo::ScopedMessagePipeHandle message_pipe =
connection->Connect(std::move(endpoint), std::move(peer_process));
on_message_pipe_ready_.Run(std::move(message_pipe), peer_pid,
result.context, std::move(connection));
return;
}
// Create non-isolated connection.
mojo::OutgoingInvitation invitation;
invitation.set_extra_flags(options_.extra_send_invitation_flags);
mojo::ScopedMessagePipeHandle message_pipe =
invitation.AttachMessagePipe(*options_.message_pipe_id);
mojo::OutgoingInvitation::Send(std::move(invitation), peer_process.Handle(),
std::move(endpoint));
on_message_pipe_ready_.Run(std::move(message_pipe), peer_pid, result.context,
nullptr);
}
void NamedMojoMessagePipeServer::OnServerEndpointCreated() {
if (on_server_endpoint_created_callback_for_testing_) {
on_server_endpoint_created_callback_for_testing_.Run();
}
}
} // namespace named_mojo_ipc_server
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