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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SANDBOX_LINUX_SYSCALL_BROKER_BROKER_HOST_H_
#define SANDBOX_LINUX_SYSCALL_BROKER_BROKER_HOST_H_
#include <optional>
#include "base/containers/span.h"
#include "base/memory/raw_ref.h"
#include "sandbox/linux/syscall_broker/broker_channel.h"
#include "sandbox/linux/syscall_broker/broker_command.h"
#include "sandbox/linux/syscall_broker/broker_sandbox_config.h"
namespace sandbox {
namespace syscall_broker {
class BrokerSimpleMessage;
// The BrokerHost class should be embedded in a (presumably not sandboxed)
// process. It will honor IPC requests from a BrokerClient sent over
// |ipc_channel| according to |broker_permission_list|.
class BrokerHost {
public:
BrokerHost(const BrokerSandboxConfig& policy,
BrokerChannel::EndPoint ipc_channel,
pid_t sandboxed_process_pid);
BrokerHost(const BrokerHost&) = delete;
BrokerHost& operator=(const BrokerHost&) = delete;
~BrokerHost();
// Receive system call requests and handle them forevermore.
void LoopAndHandleRequests();
private:
[[nodiscard]] std::optional<std::string> RewritePathname(
const char* pathname);
[[nodiscard]] std::optional<std::pair<const char*, int>> GetPathAndFlags(
BrokerSimpleMessage* message);
void AccessFileForIPC(const char* requested_filename,
int mode,
BrokerSimpleMessage* reply);
void MkdirFileForIPC(const char* requested_filename,
int mode,
BrokerSimpleMessage* reply);
void OpenFileForIPC(const char* requested_filename,
int flags,
BrokerSimpleMessage* reply,
base::ScopedFD* opened_file);
void RenameFileForIPC(const char* old_filename,
const char* new_filename,
BrokerSimpleMessage* reply);
void ReadlinkFileForIPC(const char* filename, BrokerSimpleMessage* reply);
void RmdirFileForIPC(const char* requested_filename,
BrokerSimpleMessage* reply);
void StatFileForIPC(BrokerCommand command_type,
const char* requested_filename,
bool follow_links,
BrokerSimpleMessage* reply);
void UnlinkFileForIPC(const char* requested_filename,
BrokerSimpleMessage* message);
void InotifyAddWatchForIPC(base::ScopedFD inotify_fd,
const char* requested_filename,
uint32_t mask,
BrokerSimpleMessage* message);
bool HandleRemoteCommand(BrokerSimpleMessage* message,
base::span<base::ScopedFD> recv_fds,
BrokerSimpleMessage* reply,
base::ScopedFD* opened_file);
const raw_ref<const BrokerSandboxConfig> policy_;
const BrokerChannel::EndPoint ipc_channel_;
const pid_t sandboxed_process_pid_;
};
} // namespace syscall_broker
} // namespace sandbox
#endif // SANDBOX_LINUX_SYSCALL_BROKER_BROKER_HOST_H_
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