#!/usr/bin/python2
# -*- coding: utf-8 -*-
#
# The Qubes OS Project, http://www.qubes-os.org
#
# Copyright (C) 2010 Joanna Rutkowska <joanna@invisiblethingslab.com>
# Copyright (C) 2013 Marek Marczykowski <marmarek@invisiblethingslab.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
#
from datetime import datetime
from qubes.qubes import QubesNetVm,register_qubes_vm_class,vmm,dry_run
from qubes.qubes import QubesVmCollection,QubesException
yum_proxy_ip = '10.137.255.254'
yum_proxy_port = '8082'
class QubesProxyVm(QubesNetVm):
"""
A class that represents a ProxyVM, ex FirewallVM. A child of QubesNetVM.
"""
def get_attrs_config(self):
attrs_config = super(QubesProxyVm, self).get_attrs_config()
attrs_config['uses_default_netvm']['func'] = lambda x: False
# Save netvm prop again
attrs_config['netvm']['save'] = \
lambda: str(self.netvm.qid) if self.netvm is not None else "none"
return attrs_config
def __init__(self, **kwargs):
super(QubesProxyVm, self).__init__(**kwargs)
self.rules_applied = None
@property
def type(self):
return "ProxyVM"
def is_proxyvm(self):
return True
def _set_netvm(self, new_netvm):
old_netvm = self.netvm
super(QubesProxyVm, self)._set_netvm(new_netvm)
if self.netvm is not None:
self.netvm.add_external_ip_permission(self.get_xid())
self.write_netvm_domid_entry()
if old_netvm is not None:
old_netvm.remove_external_ip_permission(self.get_xid())
def post_vm_net_attach(self, vm):
""" Called after some VM net-attached to this ProxyVm """
self.write_iptables_xenstore_entry()
def post_vm_net_detach(self, vm):
""" Called after some VM net-detached from this ProxyVm """
self.write_iptables_xenstore_entry()
def start(self, **kwargs):
if dry_run:
return
retcode = super(QubesProxyVm, self).start(**kwargs)
if self.netvm is not None:
self.netvm.add_external_ip_permission(self.get_xid())
self.write_netvm_domid_entry()
return retcode
def force_shutdown(self, **kwargs):
if dry_run:
return
if self.netvm is not None:
self.netvm.remove_external_ip_permission(kwargs['xid'] if 'xid' in kwargs else self.get_xid())
super(QubesProxyVm, self).force_shutdown(**kwargs)
def create_xenstore_entries(self, xid = None):
if dry_run:
return
if xid is None:
xid = self.xid
super(QubesProxyVm, self).create_xenstore_entries(xid)
self.qdb.write("/qubes-iptables-error", '')
self.write_iptables_xenstore_entry()
def write_netvm_domid_entry(self, xid = -1):
if not self.is_running():
return
if xid < 0:
xid = self.get_xid()
if self.netvm is None:
self.qdb.write("/qubes-netvm-domid", '')
else:
self.qdb.write("/qubes-netvm-domid",
"{0}".format(self.netvm.get_xid()))
def write_iptables_xenstore_entry(self):
self.qdb.rm("/qubes-iptables-domainrules/")
iptables = "# Generated by Qubes Core on {0}\n".format(datetime.now().ctime())
iptables += "*filter\n"
iptables += ":INPUT DROP [0:0]\n"
iptables += ":FORWARD DROP [0:0]\n"
iptables += ":OUTPUT ACCEPT [0:0]\n"
# Strict INPUT rules
iptables += "-A INPUT -i vif+ -p udp -m udp --dport 68 -j DROP\n"
iptables += "-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED " \
"-j ACCEPT\n"
iptables += "-A INPUT -p icmp -j ACCEPT\n"
iptables += "-A INPUT -i lo -j ACCEPT\n"
iptables += "-A INPUT -j REJECT --reject-with icmp-host-prohibited\n"
iptables += "-A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED " \
"-j ACCEPT\n"
# Allow dom0 networking
iptables += "-A FORWARD -i vif0.0 -j ACCEPT\n"
# Deny inter-VMs networking
iptables += "-A FORWARD -i vif+ -o vif+ -j DROP\n"
iptables += "COMMIT\n"
self.qdb.write("/qubes-iptables-header", iptables)
vms = [vm for vm in self.connected_vms.values()]
for vm in vms:
iptables="*filter\n"
conf = vm.get_firewall_conf()
xid = vm.get_xid()
if xid < 0: # VM not active ATM
continue
ip = vm.ip
if ip is None:
continue
# Anti-spoof rules are added by vif-script (vif-route-qubes), here we trust IP address
accept_action = "ACCEPT"
reject_action = "REJECT --reject-with icmp-host-prohibited"
if conf["allow"]:
default_action = accept_action
rules_action = reject_action
else:
default_action = reject_action
rules_action = accept_action
for rule in conf["rules"]:
iptables += "-A FORWARD -s {0} -d {1}".format(ip, rule["address"])
if rule["netmask"] != 32:
iptables += "/{0}".format(rule["netmask"])
if rule["proto"] is not None and rule["proto"] != "any":
iptables += " -p {0}".format(rule["proto"])
if rule["portBegin"] is not None and rule["portBegin"] > 0:
iptables += " --dport {0}".format(rule["portBegin"])
if rule["portEnd"] is not None and rule["portEnd"] > rule["portBegin"]:
iptables += ":{0}".format(rule["portEnd"])
iptables += " -j {0}\n".format(rules_action)
if conf["allowDns"] and self.netvm is not None:
# PREROUTING does DNAT to NetVM DNSes, so we need self.netvm.
# properties
iptables += "-A FORWARD -s {0} -p udp -d {1} --dport 53 -j " \
"ACCEPT\n".format(ip,self.netvm.gateway)
iptables += "-A FORWARD -s {0} -p udp -d {1} --dport 53 -j " \
"ACCEPT\n".format(ip,self.netvm.secondary_dns)
iptables += "-A FORWARD -s {0} -p tcp -d {1} --dport 53 -j " \
"ACCEPT\n".format(ip,self.netvm.gateway)
iptables += "-A FORWARD -s {0} -p tcp -d {1} --dport 53 -j " \
"ACCEPT\n".format(ip,self.netvm.secondary_dns)
if conf["allowIcmp"]:
iptables += "-A FORWARD -s {0} -p icmp -j ACCEPT\n".format(ip)
if conf["allowYumProxy"]:
iptables += "-A FORWARD -s {0} -p tcp -d {1} --dport {2} -j ACCEPT\n".format(ip, yum_proxy_ip, yum_proxy_port)
else:
iptables += "-A FORWARD -s {0} -p tcp -d {1} --dport {2} -j DROP\n".format(ip, yum_proxy_ip, yum_proxy_port)
iptables += "-A FORWARD -s {0} -j {1}\n".format(ip, default_action)
iptables += "COMMIT\n"
self.qdb.write("/qubes-iptables-domainrules/"+str(xid), iptables)
# no need for ending -A FORWARD -j DROP, cause default action is DROP
self.write_netvm_domid_entry()
self.rules_applied = None
self.qdb.write("/qubes-iptables", 'reload')
register_qubes_vm_class(QubesProxyVm)