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// Copyright 2015 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.
#ifndef SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_
#define SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_
#include <string>
#include <vector>
#include "base/command_line.h"
#include "base/macros.h"
#include "base/process/launch.h"
#include "base/process/process.h"
#include "sandbox/sandbox_export.h"
namespace sandbox {
// Helper class for starting a process inside a new user, PID, and network
// namespace. Before using a namespace sandbox, check for namespaces support
// using Credentials::CanCreateProcessInNewUserNS.
//
// A typical use for "A" launching a sandboxed process "B" would be:
// 1. A sets up a command line and launch options for process B.
// 2. A launches B with LaunchProcess.
// 3. B should be prepared to assume the role of init(1). In particular, apart
// from SIGKILL and SIGSTOP, B cannot receive any signal for which it does
// not have an explicit signal handler registered.
// If B dies, all the processes in the namespace will die.
// B can fork() and the parent can assume the role of init(1), by using
// CreateInitProcessReaper().
// 4. B chroots using Credentials::MoveToNewUserNS() and
// Credentials::DropFileSystemAccess()
// 5. B drops capabilities gained by entering the new user namespace with
// Credentials::DropAllCapabilities().
class SANDBOX_EXPORT NamespaceSandbox {
public:
// Launch a new process inside its own user/PID/network namespaces (depending
// on kernel support). Requires at a minimum that user namespaces are
// supported (use Credentials::CanCreateProcessInNewUserNS to check this).
//
// pre_exec_delegate and clone_flags fields of LaunchOptions should be nullptr
// and 0, respectively, since this function makes a copy of options and
// overrides them.
static base::Process LaunchProcess(const base::CommandLine& cmdline,
const base::LaunchOptions& options);
static base::Process LaunchProcess(const std::vector<std::string>& argv,
const base::LaunchOptions& options);
// Returns whether the namespace sandbox created a new user, PID, and network
// namespace. In particular, InNewUserNamespace should return true iff the
// process was started via this class.
static bool InNewUserNamespace();
static bool InNewPidNamespace();
static bool InNewNetNamespace();
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(NamespaceSandbox);
};
} // namespace sandbox
#endif // SANDBOX_LINUX_SERVICES_NAMESPACE_SANDBOX_H_
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