mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-17 12:55:56 +00:00
67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
|
|
* You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef mozilla_SandboxChroot_h
|
|
#define mozilla_SandboxChroot_h
|
|
|
|
#include <pthread.h>
|
|
|
|
#include "mozilla/Attributes.h"
|
|
|
|
// This class uses the chroot(2) system call and Linux namespaces to
|
|
// revoke the process's access to the filesystem. It requires that
|
|
// the process be able to create user namespaces; this is the
|
|
// kHasUserNamespaces in common/SandboxInfo.h.
|
|
//
|
|
// Usage: call Prepare() from a thread with CAP_SYS_CHROOT in its
|
|
// effective capability set, then later call Invoke() when ready to
|
|
// drop filesystem access. Prepare() creates a thread to do the
|
|
// chrooting, so the caller can (and should!) drop its own
|
|
// capabilities afterwards. When Invoke() returns, the thread will
|
|
// have exited.
|
|
//
|
|
// (Exception: on Android/B2G <= KitKat, because of how pthread_join
|
|
// is implemented, the thread may still exist, but it will not have
|
|
// capabilities. Accordingly, on such systems, be careful about
|
|
// namespaces or other resources the thread might have inherited.)
|
|
//
|
|
// Prepare() can fail (return false); for example, if it doesn't have
|
|
// CAP_SYS_CHROOT or if it can't create a directory to chroot into.
|
|
//
|
|
// The root directory will be empty and deleted, so the process will
|
|
// not be able to create new entries in it regardless of permissions.
|
|
|
|
namespace mozilla {
|
|
|
|
class SandboxChroot final {
|
|
public:
|
|
SandboxChroot();
|
|
~SandboxChroot();
|
|
bool Prepare();
|
|
void Invoke();
|
|
private:
|
|
enum Command {
|
|
NO_THREAD,
|
|
NO_COMMAND,
|
|
DO_CHROOT,
|
|
JUST_EXIT,
|
|
};
|
|
|
|
pthread_t mThread;
|
|
pthread_mutex_t mMutex;
|
|
pthread_cond_t mWakeup;
|
|
Command mCommand;
|
|
int mFd;
|
|
|
|
void ThreadMain();
|
|
static void* StaticThreadMain(void* aVoidPtr);
|
|
bool SendCommand(Command aComm);
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_SandboxChroot_h
|