Source code for qubes.ext.r3compatibility
#
# The Qubes OS Project, https://www.qubes-os.org/
#
# Copyright (C) 2010 Joanna Rutkowska <joanna@invisiblethingslab.com>
# Copyright (C) 2013-2016 Marek Marczykowski-Górecki
# <marmarek@invisiblethingslab.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, see <https://www.gnu.org/licenses/>.
#
import datetime
import qubes.ext
import qubes.firewall
import qubes.vm.qubesvm
import qubes.vm.appvm
import qubes.vm.templatevm
import qubes.utils
yum_proxy_ip = '10.137.255.254'
yum_proxy_port = '8082'
[docs]
class R3Compatibility(qubes.ext.Extension):
'''Maintain VM interface compatibility with R3.0 and R3.1.
At least where possible.
'''
features_to_services = {
'service.ntpd': 'ntpd',
'check-updates': 'qubes-update-check',
'dvm': 'qubes-dvm',
}
# noinspection PyUnusedLocal
@qubes.ext.handler('domain-qdb-create')
def on_domain_qdb_create(self, vm, event):
'''
:param qubes.vm.qubesvm.QubesVM vm: \
VM on which QubesDB entries were just created
''' # pylint: disable=unused-argument
# /qubes-vm-type: AppVM, NetVM, ProxyVM, TemplateVM
if isinstance(vm, qubes.vm.templatevm.TemplateVM):
vmtype = 'TemplateVM'
elif vm.netvm is not None and vm.provides_network:
vmtype = 'ProxyVM'
elif vm.netvm is None and vm.provides_network:
vmtype = 'NetVM'
else:
vmtype = 'AppVM'
vm.untrusted_qdb.write('/qubes-vm-type', vmtype)
vm.untrusted_qdb.write("/qubes-iptables-error", '')
self.write_iptables_qubesdb_entry(vm)
self.write_services(vm)
@qubes.ext.handler('domain-spawn')
def on_domain_started(self, vm, event, **kwargs):
# pylint: disable=unused-argument
if vm.netvm:
self.write_iptables_qubesdb_entry(vm.netvm)
@qubes.ext.handler('firewall-changed')
def on_firewall_changed(self, vm, event):
# pylint: disable=unused-argument
if vm.is_running() and vm.netvm:
self.write_iptables_qubesdb_entry(vm.netvm)
def write_iptables_qubesdb_entry(self, firewallvm):
# skip compatibility rules if new format support is advertised
if firewallvm.features.check_with_template('qubes-firewall', False):
return
firewallvm.untrusted_qdb.rm("/qubes-iptables-domainrules/")
iptables = "# Generated by Qubes Core on {0}\n".format(
datetime.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"
# Deny inter-VMs networking
iptables += "-A FORWARD -i vif+ -o vif+ -j DROP\n"
iptables += "COMMIT\n"
firewallvm.untrusted_qdb.write("/qubes-iptables-header", iptables)
for vm in firewallvm.connected_vms:
iptables = "*filter\n"
conf = vm.firewall
xid = vm.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
for rule in conf.rules:
if rule.specialtarget == 'dns':
if rule.dstports not in ('53', None):
continue
if rule.proto:
protos = {'tcp', 'udp'}.intersection(str(rule.proto))
else:
protos = {'tcp', 'udp'}
for proto in protos:
if rule.dsthost:
dsthosts = set(vm.dns).intersection(
[str(rule.dsthost).replace('/24', '')])
else:
dsthosts = vm.dns
for dsthost in dsthosts:
iptables += '-A FORWARD -s {}'.format(ip)
iptables += ' -d {!s}'.format(dsthost)
iptables += ' -p {!s}'.format(proto)
iptables += ' --dport 53'
iptables += ' -j {}\n'.format(
str(rule.action).upper())
else:
iptables += '-A FORWARD -s {}'.format(ip)
if rule.dsthost:
iptables += ' -d {!s}'.format(rule.dsthost)
if rule.proto:
iptables += ' -p {!s}'.format(rule.proto)
if rule.dstports:
iptables += ' --dport {}'.format(
str(rule.dstports).replace('-', ':'))
iptables += ' -j {0}\n'.format(str(rule.action).upper())
iptables += '-A FORWARD -s {0} -j {1}\n'.format(ip,
str(conf.policy).upper())
iptables += 'COMMIT\n'
firewallvm.untrusted_qdb.write(
'/qubes-iptables-domainrules/' + str(xid),
iptables)
# no need for ending -A FORWARD -j DROP, cause default action is DROP
firewallvm.untrusted_qdb.write('/qubes-iptables', 'reload')
def write_services(self, vm):
for feature, value in vm.features.items():
service = self.features_to_services.get(feature, None)
if service is None:
continue
# forcefully convert to '0' or '1'
vm.untrusted_qdb.write('/qubes-service/{}'.format(service),
str(int(bool(value))))
if 'updates-proxy-setup' in vm.features.keys():
vm.untrusted_qdb.write(
'/qubes-service/{}'.format('yum-proxy-setup'),
str(int(bool(vm.features['updates-proxy-setup']))))