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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.
#include "chromeos/network/firewall_hole.h"
#include <fcntl.h>
#include <unistd.h>
#include "base/bind.h"
#include "base/location.h"
#include "base/threading/worker_pool.h"
#include "chromeos/dbus/dbus_thread_manager.h"
#include "chromeos/dbus/permission_broker_client.h"
#include "dbus/file_descriptor.h"
namespace chromeos {
namespace {
// Creates a pair of file descriptors that form a "lifeline" between Chrome and
// firewalld. If this pipe is closed unexpectedly (i.e. Chrome crashes) then
// firewalld will notice and close the hole in the firewall.
void CreateValidLifeline(dbus::FileDescriptor* lifeline_local,
dbus::FileDescriptor* lifeline_remote) {
int lifeline[2] = {-1, -1};
if (pipe2(lifeline, O_CLOEXEC) < 0) {
PLOG(ERROR) << "Failed to create a lifeline pipe";
return;
}
lifeline_local->PutValue(lifeline[0]);
lifeline_local->CheckValidity();
lifeline_remote->PutValue(lifeline[1]);
lifeline_remote->CheckValidity();
}
const char* PortTypeToString(FirewallHole::PortType type) {
switch (type) {
case FirewallHole::PortType::TCP:
return "TCP";
case FirewallHole::PortType::UDP:
return "UDP";
}
NOTREACHED();
return nullptr;
}
void PortReleased(FirewallHole::PortType type,
uint16_t port,
const std::string& interface,
FirewallHole::ScopedFileDescriptor lifeline_fd,
bool success) {
if (!success) {
LOG(WARNING) << "Failed to release firewall hole for "
<< PortTypeToString(type) << " port " << port << " on "
<< interface << ".";
}
}
} // namespace
void CHROMEOS_EXPORT FirewallHole::FileDescriptorDeleter::operator()(
dbus::FileDescriptor* fd) {
base::WorkerPool::PostTask(
FROM_HERE, base::Bind(&base::DeletePointer<dbus::FileDescriptor>, fd),
false);
}
// static
void FirewallHole::Open(PortType type,
uint16_t port,
const std::string& interface,
const OpenCallback& callback) {
ScopedFileDescriptor lifeline_local(new dbus::FileDescriptor());
ScopedFileDescriptor lifeline_remote(new dbus::FileDescriptor());
// This closure shares pointers with the one below. PostTaskAndReply
// guarantees that it will always be deleted first.
base::Closure create_lifeline_closure = base::Bind(
&CreateValidLifeline, lifeline_local.get(), lifeline_remote.get());
base::WorkerPool::PostTaskAndReply(
FROM_HERE, create_lifeline_closure,
base::Bind(&FirewallHole::RequestPortAccess, type, port, interface,
base::Passed(&lifeline_local), base::Passed(&lifeline_remote),
callback),
false);
}
FirewallHole::~FirewallHole() {
base::Callback<void(bool)> port_released_closure = base::Bind(
&PortReleased, type_, port_, interface_, base::Passed(&lifeline_fd_));
PermissionBrokerClient* client =
DBusThreadManager::Get()->GetPermissionBrokerClient();
DCHECK(client) << "Could not get permission broker client.";
switch (type_) {
case PortType::TCP:
client->ReleaseTcpPort(port_, interface_, port_released_closure);
return;
case PortType::UDP:
client->ReleaseUdpPort(port_, interface_, port_released_closure);
return;
}
}
void FirewallHole::RequestPortAccess(PortType type,
uint16_t port,
const std::string& interface,
ScopedFileDescriptor lifeline_local,
ScopedFileDescriptor lifeline_remote,
const OpenCallback& callback) {
if (!lifeline_local->is_valid() || !lifeline_remote->is_valid()) {
callback.Run(nullptr);
return;
}
base::Callback<void(bool)> access_granted_closure =
base::Bind(&FirewallHole::PortAccessGranted, type, port, interface,
base::Passed(&lifeline_local), callback);
PermissionBrokerClient* client =
DBusThreadManager::Get()->GetPermissionBrokerClient();
DCHECK(client) << "Could not get permission broker client.";
switch (type) {
case PortType::TCP:
client->RequestTcpPortAccess(port, interface, *lifeline_remote,
access_granted_closure);
return;
case PortType::UDP:
client->RequestUdpPortAccess(port, interface, *lifeline_remote,
access_granted_closure);
return;
}
}
void FirewallHole::PortAccessGranted(PortType type,
uint16_t port,
const std::string& interface,
ScopedFileDescriptor lifeline_fd,
const FirewallHole::OpenCallback& callback,
bool success) {
if (success) {
callback.Run(make_scoped_ptr(
new FirewallHole(type, port, interface, lifeline_fd.Pass())));
} else {
callback.Run(nullptr);
}
}
FirewallHole::FirewallHole(PortType type,
uint16_t port,
const std::string& interface,
ScopedFileDescriptor lifeline_fd)
: type_(type),
port_(port),
interface_(interface),
lifeline_fd_(lifeline_fd.Pass()) {
}
} // namespace chromeos
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