Source code for qubes.ext.r3compatibility

#
# The Qubes OS Project, https://www.qubes-os.org/
#
# Copyright (C) 2010  Joanna Rutkowska <[email protected]>
# Copyright (C) 2013-2016  Marek Marczykowski-Górecki
#                               <[email protected]>
#
# 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): # pylint: disable=no-self-use # 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']))))